Import 2.3.18pre1

[davej-history.git] / drivers / scsi / ncr53c8xx.c

/******************************************************************************
**  Device driver for the PCI-SCSI NCR538XX controller family.
**
**  Copyright (C) 1994  Wolfgang Stanglmeier
**
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
**
**  This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
**  and is currently maintained by
**
**          Gerard Roudier              <groudier@club-internet.fr>
**
**  Being given that this driver originates from the FreeBSD version, and
**  in order to keep synergy on both, any suggested enhancements and corrections
**  received on Linux are automatically a potential candidate for the FreeBSD 
**  version.
**
**  The original driver has been written for 386bsd and FreeBSD by
**          Wolfgang Stanglmeier        <wolf@cologne.de>
**          Stefan Esser                <se@mi.Uni-Koeln.de>
**
**  And has been ported to NetBSD by
**          Charles M. Hannum           <mycroft@gnu.ai.mit.edu>
**
**-----------------------------------------------------------------------------
**
**                     Brief history
**
**  December 10 1995 by Gerard Roudier:
**     Initial port to Linux.
**
**  June 23 1996 by Gerard Roudier:
**     Support for 64 bits architectures (Alpha).
**
**  November 30 1996 by Gerard Roudier:
**     Support for Fast-20 scsi.
**     Support for large DMA fifo and 128 dwords bursting.
**
**  February 27 1997 by Gerard Roudier:
**     Support for Fast-40 scsi.
**     Support for on-Board RAM.
**
**  May 3 1997 by Gerard Roudier:
**     Full support for scsi scripts instructions pre-fetching.
**
**  May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
**     Support for NvRAM detection and reading.
**
**  August 18 1997 by Cort <cort@cs.nmt.edu>:
**     Support for Power/PC (Big Endian).
**
**  June 20 1998 by Gerard Roudier <groudier@club-internet.fr>:
**     Support for up to 64 tags per lun.
**     O(1) everywhere (C and SCRIPTS) for normal cases.
**     Low PCI traffic for command handling when on-chip RAM is present.
**     Aggressive SCSI SCRIPTS optimizations.
**
*******************************************************************************
*/

/*
**      March 7 1999, version 3.2
**
**      Supported SCSI-II features:
**          Synchronous negotiation
**          Wide negotiation        (depends on the NCR Chip)
**          Enable disconnection
**          Tagged command queuing
**          Parity checking
**          Etc...
**
**      Supported NCR chips:
**              53C810          (8 bits, Fast SCSI-2, no rom BIOS) 
**              53C815          (8 bits, Fast SCSI-2, on board rom BIOS)
**              53C820          (Wide,   Fast SCSI-2, no rom BIOS)
**              53C825          (Wide,   Fast SCSI-2, on board rom BIOS)
**              53C860          (8 bits, Fast 20,     no rom BIOS)
**              53C875          (Wide,   Fast 20,     on board rom BIOS)
**              53C895          (Wide,   Fast 40,     on board rom BIOS)
**
**      Other features:
**              Memory mapped IO (linux-1.3.X and above only)
**              Module
**              Shared IRQ (since linux-1.3.72)
*/

/*
**      Name and version of the driver
*/
#define SCSI_NCR_DRIVER_NAME    "ncr53c8xx - version 3.2"

#define SCSI_NCR_DEBUG_FLAGS    (0)

/*==========================================================
**
**      Include files
**
**==========================================================
*/

#define LinuxVersionCode(v, p, s) (((v)<<16)+((p)<<8)+(s))

#ifdef MODULE
#include <linux/module.h>
#endif

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,93)
#include <linux/spinlock.h>
#endif
#include <linux/delay.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/malloc.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/stat.h>

#include <linux/version.h>
#include <linux/blk.h>

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,35)
#include <linux/init.h>
#else
#ifndef __initdata
#define __initdata
#endif
#endif

#if LINUX_VERSION_CODE <= LinuxVersionCode(2,1,92)
#include <linux/bios32.h>
#endif

#include "scsi.h"
#include "hosts.h"
#include "constants.h"
#include "sd.h"

#include <linux/types.h>

/*
**      Define BITS_PER_LONG for earlier linux versions.
*/
#ifndef BITS_PER_LONG
#if (~0UL) == 0xffffffffUL
#define BITS_PER_LONG   32
#else
#define BITS_PER_LONG   64
#endif
#endif

/*
**      Define the BSD style u_int32 and u_int64 type.
**      Are in fact u_int32_t and u_int64_t :-)
*/
typedef u32 u_int32;
typedef u64 u_int64;

#include "ncr53c8xx.h"

/*==========================================================
**
**      A la VMS/CAM-3 queue management.
**      Implemented from linux list management.
**
**==========================================================
*/

typedef struct xpt_quehead {
        struct xpt_quehead *flink;      /* Forward  pointer */
        struct xpt_quehead *blink;      /* Backward pointer */
} XPT_QUEHEAD;

#define xpt_que_init(ptr) do { \
        (ptr)->flink = (ptr); (ptr)->blink = (ptr); \
} while (0)

static inline void __xpt_que_add(struct xpt_quehead * new,
        struct xpt_quehead * blink,
        struct xpt_quehead * flink)
{
        flink->blink    = new;
        new->flink      = flink;
        new->blink      = blink;
        blink->flink    = new;
}

static inline void __xpt_que_del(struct xpt_quehead * blink,
        struct xpt_quehead * flink)
{
        flink->blink = blink;
        blink->flink = flink;
}

static inline int xpt_que_empty(struct xpt_quehead *head)
{
        return head->flink == head;
}

static inline void xpt_que_splice(struct xpt_quehead *list,
        struct xpt_quehead *head)
{
        struct xpt_quehead *first = list->flink;

        if (first != list) {
                struct xpt_quehead *last = list->blink;
                struct xpt_quehead *at   = head->flink;

                first->blink = head;
                head->flink  = first;

                last->flink = at;
                at->blink   = last;
        }
}

#define xpt_que_entry(ptr, type, member) \
        ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))


#define xpt_insque(new, pos)            __xpt_que_add(new, pos, (pos)->flink)

#define xpt_remque(el)                  __xpt_que_del((el)->blink, (el)->flink)

#define xpt_insque_head(new, head)      __xpt_que_add(new, head, (head)->flink)

static inline struct xpt_quehead *xpt_remque_head(struct xpt_quehead *head)
{
        struct xpt_quehead *elem = head->flink;

        if (elem != head)
                __xpt_que_del(head, elem->flink);
        else
                elem = 0;
        return elem;
}

#define xpt_insque_tail(new, head)      __xpt_que_add(new, (head)->blink, head)

static inline struct xpt_quehead *xpt_remque_tail(struct xpt_quehead *head)
{
        struct xpt_quehead *elem = head->blink;

        if (elem != head)
                __xpt_que_del(elem->blink, head);
        else
                elem = 0;
        return elem;
}

/*==========================================================
**
**      The CCB done queue uses an array of CCB virtual 
**      addresses. Empty entries are flagged using the bogus 
**      virtual address 0xffffffff.
**
**      Since PCI ensures that only aligned DWORDs are accessed 
**      atomically, 64 bit little-endian architecture requires 
**      to test the high order DWORD of the entry to determine 
**      if it is empty or valid.
**
**      BTW, I will make things differently as soon as I will 
**      have a better idea, but this is simple and should work.
**
**==========================================================
*/
 
#define SCSI_NCR_CCB_DONE_SUPPORT
#ifdef  SCSI_NCR_CCB_DONE_SUPPORT

#define MAX_DONE 24
#define CCB_DONE_EMPTY 0xffffffffUL

/* All 32 bit architectures */
#if BITS_PER_LONG == 32
#define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)

/* All > 32 bit (64 bit) architectures regardless endian-ness */
#else
#define CCB_DONE_VALID(cp)  \
        ((((u_long) cp) & 0xffffffff00000000ul) &&      \
         (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
#endif

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */

/*==========================================================
**
**      On x86 architecture, write buffers management does 
**      not reorder writes to memory. So, using compiler 
**      optimization barriers is enough to guarantee some 
**      ordering when the CPU is writing data accessed by 
**      the NCR.
**      On Alpha architecture, explicit memory barriers have 
**      to be used.
**      Other architectures are defaulted to mb() macro if  
**      defined, otherwise use compiler barrier.
**
**==========================================================
*/

#if defined(__i386__)
#define MEMORY_BARRIER()        barrier()
#elif defined(__alpha__)
#define MEMORY_BARRIER()        mb()
#else
#  ifdef mb
#  define MEMORY_BARRIER()      mb()
#  else
#  define MEMORY_BARRIER()      barrier()
#  endif
#endif

/*==========================================================
**
**      Configuration and Debugging
**
**==========================================================
*/

/*
**    SCSI address of this device.
**    The boot routines should have set it.
**    If not, use this.
*/

#ifndef SCSI_NCR_MYADDR
#define SCSI_NCR_MYADDR      (7)
#endif

/*
**    The maximum number of tags per logic unit.
**    Used only for disk devices that support tags.
*/

#ifndef SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS    (8)
#endif

/*
**    TAGS are actually limited to 64 tags/lun.
**    We need to deal with power of 2, for alignment constraints.
*/
#if     SCSI_NCR_MAX_TAGS > 64
#undef  SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS (64)
#endif

#define NO_TAG  (255)

/*
**      Choose appropriate type for tag bitmap.
*/
#if     SCSI_NCR_MAX_TAGS > 32
typedef u_int64 tagmap_t;
#else
typedef u_int32 tagmap_t;
#endif

/*
**    Number of targets supported by the driver.
**    n permits target numbers 0..n-1.
**    Default is 16, meaning targets #0..#15.
**    #7 .. is myself.
*/

#ifdef SCSI_NCR_MAX_TARGET
#define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
#else
#define MAX_TARGET  (16)
#endif

/*
**    Number of logic units supported by the driver.
**    n enables logic unit numbers 0..n-1.
**    The common SCSI devices require only
**    one lun, so take 1 as the default.
*/

#ifdef SCSI_NCR_MAX_LUN
#define MAX_LUN    SCSI_NCR_MAX_LUN
#else
#define MAX_LUN    (1)
#endif

/*
**    Asynchronous pre-scaler (ns). Shall be 40
*/
 
#ifndef SCSI_NCR_MIN_ASYNC
#define SCSI_NCR_MIN_ASYNC (40)
#endif

/*
**    The maximum number of jobs scheduled for starting.
**    There should be one slot per target, and one slot
**    for each tag of each target in use.
**    The calculation below is actually quite silly ...
*/

#ifdef SCSI_NCR_CAN_QUEUE
#define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
#else
#define MAX_START   (MAX_TARGET + 7 * SCSI_NCR_MAX_TAGS)
#endif

/*
**    The maximum number of segments a transfer is split into.
**    We support up to 127 segments for both read and write.
**    The data scripts are broken into 2 sub-scripts.
**    80 (MAX_SCATTERL) segments are moved from a sub-script 
**    in on-chip RAM. This makes data transfers shorter than 
**    80k (assuming 1k fs) as fast as possible.
*/

#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)

#if (MAX_SCATTER > 80)
#define MAX_SCATTERL    80
#define MAX_SCATTERH    (MAX_SCATTER - MAX_SCATTERL)
#else
#define MAX_SCATTERL    (MAX_SCATTER-1)
#define MAX_SCATTERH    1
#endif

/*
**    Io mapped or memory mapped.
*/

#if defined(SCSI_NCR_IOMAPPED)
#define NCR_IOMAPPED
#endif

/*
**      other
*/

#define NCR_SNOOP_TIMEOUT (1000000)

/*==========================================================
**
**      Defines for Linux.
**
**      Linux and Bsd kernel functions are quite different.
**      These defines allow a minimum change of the original
**      code.
**
**==========================================================
*/

 /*
 **     Obvious definitions
 */

#define u_char          unsigned char
#define u_short         unsigned short
#define u_int           unsigned int
#define u_long          unsigned long

typedef u_long          vm_offset_t;
typedef int             vm_size_t;

#ifndef bcopy
#define bcopy(s, d, n)  memcpy((d), (s), (n))
#endif
#ifndef bzero
#define bzero(d, n)     memset((d), 0, (n))
#endif
 
#ifndef offsetof
#define offsetof(t, m)  ((size_t) (&((t *)0)->m))
#endif

/*
**      SMP threading.
**
**      Assuming that SMP systems are generally high end systems and may 
**      use several SCSI adapters, we are using one lock per controller 
**      instead of some global one. For the moment (linux-2.1.95), driver's 
**      entry points are called with the 'io_request_lock' lock held, so:
**      - We are uselessly loosing a couple of micro-seconds to lock the 
**        controller data structure.
**      - But the driver is not broken by design for SMP and so can be 
**        more resistant to bugs or bad changes in the IO sub-system code.
**      - A small advantage could be that the interrupt code is grained as 
**        wished (e.g.: threaded by controller).
*/

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,93)

#if 0   /* not yet needed */
static spinlock_t driver_lock;
#define NCR_LOCK_DRIVER(flags)     spin_lock_irqsave(&driver_lock, flags)
#define NCR_UNLOCK_DRIVER(flags)   spin_unlock_irqrestore(&driver_lock, flags)
#endif

#define NCR_INIT_LOCK_NCB(np)      spin_lock_init(&np->smp_lock);
#define NCR_LOCK_NCB(np, flags)    spin_lock_irqsave(&np->smp_lock, flags)
#define NCR_UNLOCK_NCB(np, flags)  spin_unlock_irqrestore(&np->smp_lock, flags)

#       if LINUX_VERSION_CODE < LinuxVersionCode(2,3,99)

#       define  NCR_LOCK_SCSI_DONE(np, flags) \
                spin_lock_irqsave(&io_request_lock, flags)
#       define  NCR_UNLOCK_SCSI_DONE(np, flags) \
                spin_unlock_irqrestore(&io_request_lock, flags)

#       else

#       define  NCR_LOCK_SCSI_DONE(np, flags)    do {;} while (0)
#       define  NCR_UNLOCK_SCSI_DONE(np, flags)  do {;} while (0)

#       endif

#else

#if 0   /* not yet needed */
#define NCR_LOCK_DRIVER(flags)     do {;} while (0)
#define NCR_UNLOCK_DRIVER(flags)   do {;} while (0)
#endif

#define NCR_INIT_LOCK_NCB(np)      do { } while (0)
#define NCR_LOCK_NCB(np, flags)    do { save_flags(flags); cli(); } while (0)
#define NCR_UNLOCK_NCB(np, flags)  do { restore_flags(flags); } while (0)

#define NCR_LOCK_SCSI_DONE(np, flags)    do {;} while (0)
#define NCR_UNLOCK_SCSI_DONE(np, flags)  do {;} while (0)

#endif

/*
**      Address translation
**
**      The driver has to provide physical memory addresses to 
**      the script processor. Because some architectures use 
**      different physical addresses from the PCI BUS, we must 
**      use virt_to_bus instead of virt_to_phys.
*/

#define vtophys(p)      virt_to_bus(p)

/*
**      Memory mapped IO
**
**      Since linux-2.1, we must use ioremap() to map the io memory space.
**      iounmap() to unmap it. That allows portability.
**      Linux 1.3.X and 2.0.X allow to remap physical pages addresses greater 
**      than the highest physical memory address to kernel virtual pages with 
**      vremap() / vfree(). That was not portable but worked with i386 
**      architecture.
*/

#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,0)
#define ioremap vremap
#define iounmap vfree
#endif

#if defined (__sparc__)
#include <asm/irq.h>
#elif defined (__alpha__)
#define bus_dvma_to_mem(p)              ((p) & 0xfffffffful)
#else
#define bus_dvma_to_mem(p)              (p)
#endif

#if defined(__i386__) || !defined(NCR_IOMAPPED)
static vm_offset_t __init remap_pci_mem(u_long base, u_long size)
{
        u_long page_base        = ((u_long) base) & PAGE_MASK;
        u_long page_offs        = ((u_long) base) - page_base;
        u_long page_remapped    = (u_long) ioremap(page_base, page_offs+size);

        return (vm_offset_t) (page_remapped? (page_remapped + page_offs) : 0UL);
}

static void __init unmap_pci_mem(vm_offset_t vaddr, u_long size)
{
        if (vaddr)
                iounmap((void *) (vaddr & PAGE_MASK));
}
#endif  /* __i386__ || !NCR_IOMAPPED */

/*
**      Insert a delay in micro-seconds and milli-seconds.
**      -------------------------------------------------
**      Under Linux, udelay() is restricted to delay < 1 milli-second.
**      In fact, it generally works for up to 1 second delay.
**      Since 2.1.105, the mdelay() function is provided for delays 
**      in milli-seconds.
**      Under 2.0 kernels, udelay() is an inline function that is very 
**      inaccurate on Pentium processors.
*/

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,105)
#define UDELAY udelay
#define MDELAY mdelay
#else
static void UDELAY(long us) { udelay(us); }
static void MDELAY(long ms) { while (ms--) UDELAY(1000); }
#endif

/*
**      Internal data structure allocation.
**
**      Linux scsi memory poor pool is adjusted for the need of
**      middle-level scsi driver.
**      We allocate our control blocks in the kernel memory pool
**      to avoid scsi pool shortage.
**
**      kmalloc() only ensures 8 bytes boundary alignment.
**      The NCR need better alignment for cache line bursting.
**      The global header is moved between the NCB and CCBs and needs 
**      origin and destination addresses to have same lower four bits.
**
**      We use 32 boundary alignment for NCB and CCBs and offset multiple 
**      of 32 for global header fields. That's too much but at least enough.
*/

#define ALIGN_SIZE(shift)       (1UL << shift)
#define ALIGN_MASK(shift)       (~(ALIGN_SIZE(shift)-1))

#define CACHE_LINE_SHIFT        5
#define CACHE_LINE_SIZE         ALIGN_SIZE(CACHE_LINE_SHIFT)
#define CACHE_LINE_MASK         ALIGN_MASK(CACHE_LINE_SHIFT)

static void *m_alloc(int size, int a_shift)
{
        u_long addr;
        void *ptr;
        u_long a_size, a_mask;

        if (a_shift < 3)
                a_shift = 3;

        a_size  = ALIGN_SIZE(a_shift);
        a_mask  = ALIGN_MASK(a_shift);

        ptr = (void *) kmalloc(size + a_size, GFP_ATOMIC);
        if (ptr) {
                addr    = (((u_long) ptr) + a_size) & a_mask;
                *((void **) (addr - sizeof(void *))) = ptr;
                ptr     = (void *) addr;
        }

        return ptr;
}

#ifdef MODULE
static void m_free(void *ptr, int size)
{
        u_long addr;

        if (ptr) {
                addr    = (u_long) ptr;
                ptr     = *((void **) (addr - sizeof(void *)));

                kfree(ptr);
        }
}
#endif

/*
**      Transfer direction
**
**      Low-level scsi drivers under Linux do not receive the expected 
**      data transfer direction from upper scsi drivers.
**      The driver will only check actual data direction for common 
**      scsi opcodes. Other ones may cause problem, since they may 
**      depend on device type or be vendor specific.
**      I would prefer to never trust the device for data direction, 
**      but that is not possible.
**
**      The original driver requires the expected direction to be known.
**      The Linux version of the driver has been enhanced in order to 
**      be able to transfer data in the direction choosen by the target. 
*/

#define XFER_IN         (1)
#define XFER_OUT        (2)

/*
**      Head of list of NCR boards
**
**      For kernel version < 1.3.70, host is retrieved by its irq level.
**      For later kernels, the internal host control block address 
**      (struct ncb) is used as device id parameter of the irq stuff.
*/

static struct Scsi_Host         *first_host     = NULL;
static Scsi_Host_Template       *the_template   = NULL; 


/*
**      /proc directory entry and proc_info function
*/

static struct proc_dir_entry proc_scsi_ncr53c8xx = {
    PROC_SCSI_NCR53C8XX, 9, "ncr53c8xx",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};
#ifdef SCSI_NCR_PROC_INFO_SUPPORT
static int ncr53c8xx_proc_info(char *buffer, char **start, off_t offset,
                        int length, int hostno, int func);
#endif

/*
**      Driver setup.
**
**      This structure is initialized from linux config options.
**      It can be overridden at boot-up by the boot command line.
*/
#define SCSI_NCR_MAX_EXCLUDES 8
struct ncr_driver_setup {
        u_char  master_parity;
        u_char  scsi_parity;
        u_char  disconnection;
        u_char  special_features;
        u_char  ultra_scsi;
        u_char  force_sync_nego;
        u_char  reverse_probe;
        u_char  pci_fix_up;
        u_char  use_nvram;
        u_char  verbose;
        u_char  default_tags;
        u_short default_sync;
        u_short debug;
        u_char  burst_max;
        u_char  led_pin;
        u_char  max_wide;
        u_char  settle_delay;
        u_char  diff_support;
        u_char  irqm;
        u_char  bus_check;
        u_char  optimize;
        u_char  recovery;
        u_int   excludes[SCSI_NCR_MAX_EXCLUDES];
        char    tag_ctrl[100];
};

static struct ncr_driver_setup
        driver_setup                    = SCSI_NCR_DRIVER_SETUP;

#ifdef  SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
static struct ncr_driver_setup
        driver_safe_setup __initdata    = SCSI_NCR_DRIVER_SAFE_SETUP;
# ifdef MODULE
char *ncr53c8xx = 0;    /* command line passed by insmod */
#  if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,30)
MODULE_PARM(ncr53c8xx, "s");
#  endif
# endif
#endif

/*
**      Other Linux definitions
*/

#define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))

static void ncr53c8xx_select_queue_depths(
        struct Scsi_Host *host, struct scsi_device *devlist);
static void ncr53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs);
static void ncr53c8xx_timeout(unsigned long np);

#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)

#ifdef SCSI_NCR_NVRAM_SUPPORT
/*
**      Symbios NvRAM data format
*/
#define SYMBIOS_NVRAM_SIZE 368
#define SYMBIOS_NVRAM_ADDRESS 0x100

struct Symbios_nvram {
/* Header 6 bytes */
        u_short start_marker;   /* 0x0000 */
        u_short byte_count;     /* excluding header/trailer */
        u_short checksum;

/* Controller set up 20 bytes */
        u_short word0;          /* 0x3000 */
        u_short word2;          /* 0x0000 */
        u_short word4;          /* 0x0000 */
        u_short flags;
#define SYMBIOS_SCAM_ENABLE     (1)
#define SYMBIOS_PARITY_ENABLE   (1<<1)
#define SYMBIOS_VERBOSE_MSGS    (1<<2)
#define SYMBIOS_CHS_MAPPING     (1<<3)
        u_short flags1;
#define SYMBIOS_SCAN_HI_LO      (1)
        u_short word10;         /* 0x00 */
        u_short flags3;         /* 0x00 */
#define SYMBIOS_REMOVABLE_FLAGS (3)             /* 0=none, 1=bootable, 2=all */
        u_char  host_id;
        u_char  byte15;         /* 0x04 */
        u_short word16;         /* 0x0410 */
        u_short word18;         /* 0x0000 */

/* Boot order 14 bytes * 4 */
        struct Symbios_host{
                u_char  word0;          /* 0x0004:ok / 0x0000:nok */
                u_short device_id;      /* PCI device id */
                u_short vendor_id;      /* PCI vendor id */
                u_char  byte6;          /* 0x00 */
                u_char  device_fn;      /* PCI device/function number << 3*/
                u_short word8;
                u_short flags;
#define SYMBIOS_INIT_SCAN_AT_BOOT       (1)
                u_short io_port;        /* PCI io_port address */
        } host[4];

/* Targets 8 bytes * 16 */
        struct Symbios_target {
                u_short flags;
#define SYMBIOS_DISCONNECT_ENABLE       (1)
#define SYMBIOS_SCAN_AT_BOOT_TIME       (1<<1)
#define SYMBIOS_SCAN_LUNS               (1<<2)
#define SYMBIOS_QUEUE_TAGS_ENABLED      (1<<3)
                u_char  bus_width;      /* 0x08/0x10 */
                u_char  sync_offset;
                u_char  sync_period;    /* 4*period factor */
                u_char  byte6;          /* 0x00 */
                u_short timeout;
        } target[16];
        u_char  spare_devices[19*8];
        u_char  trailer[6];             /* 0xfe 0xfe 0x00 0x00 0x00 0x00 */
};
typedef struct Symbios_nvram    Symbios_nvram;
typedef struct Symbios_host     Symbios_host;
typedef struct Symbios_target   Symbios_target;

/*
**      Tekram NvRAM data format.
*/
#define TEKRAM_NVRAM_SIZE 64
#define TEKRAM_NVRAM_ADDRESS 0

struct Tekram_nvram {
        struct Tekram_target {
                u_char  flags;
#define TEKRAM_PARITY_CHECK             (1)
#define TEKRAM_SYNC_NEGO                (1<<1)
#define TEKRAM_DISCONNECT_ENABLE        (1<<2)
#define TEKRAM_START_CMD                (1<<3)
#define TEKRAM_TAGGED_COMMANDS          (1<<4)
#define TEKRAM_WIDE_NEGO                (1<<5)
                u_char  sync_index;
                u_short word2;
        } target[16];
        u_char  host_id;
        u_char  flags;
#define TEKRAM_MORE_THAN_2_DRIVES       (1)
#define TEKRAM_DRIVES_SUP_1GB           (1<<1)
#define TEKRAM_RESET_ON_POWER_ON        (1<<2)
#define TEKRAM_ACTIVE_NEGATION          (1<<3)
#define TEKRAM_IMMEDIATE_SEEK           (1<<4)
#define TEKRAM_SCAN_LUNS                (1<<5)
#define TEKRAM_REMOVABLE_FLAGS          (3<<6)  /* 0: disable; 1: boot device; 2:all */
        u_char  boot_delay_index;
        u_char  max_tags_index;
        u_short flags1;
#define TEKRAM_F2_F6_ENABLED            (1)
        u_short spare[29];
};
typedef struct Tekram_nvram     Tekram_nvram;
typedef struct Tekram_target    Tekram_target;

static u_char Tekram_sync[12] __initdata = {25,31,37,43,50,62,75,125,12,15,18,21};

#endif /* SCSI_NCR_NVRAM_SUPPORT */

/*
**      Structures used by ncr53c8xx_detect/ncr53c8xx_pci_init to 
**      transmit device configuration to the ncr_attach() function.
*/
typedef struct {
        int     bus;
        u_char  device_fn;
        u_long  base;
        u_long  base_2;
        u_long  io_port;
        int     irq;
/* port and reg fields to use INB, OUTB macros */
        u_long  port;
        volatile struct ncr_reg *reg;
} ncr_slot;

typedef struct {
        int type;
#define SCSI_NCR_SYMBIOS_NVRAM  (1)
#define SCSI_NCR_TEKRAM_NVRAM   (2)
#ifdef  SCSI_NCR_NVRAM_SUPPORT
        union {
                Symbios_nvram Symbios;
                Tekram_nvram Tekram;
        } data;
#endif
} ncr_nvram;

/*
**      Structure used by ncr53c8xx_detect/ncr53c8xx_pci_init
**      to save data on each detected board for ncr_attach().
*/
typedef struct {
        ncr_slot  slot;
        ncr_chip  chip;
        ncr_nvram *nvram;
        int attach_done;
} ncr_device;

/*==========================================================
**
**      Debugging tags
**
**==========================================================
*/

#define DEBUG_ALLOC    (0x0001)
#define DEBUG_PHASE    (0x0002)
#define DEBUG_POLL     (0x0004)
#define DEBUG_QUEUE    (0x0008)
#define DEBUG_RESULT   (0x0010)
#define DEBUG_SCATTER  (0x0020)
#define DEBUG_SCRIPT   (0x0040)
#define DEBUG_TINY     (0x0080)
#define DEBUG_TIMING   (0x0100)
#define DEBUG_NEGO     (0x0200)
#define DEBUG_TAGS     (0x0400)
#define DEBUG_FREEZE   (0x0800)
#define DEBUG_RESTART  (0x1000)

/*
**    Enable/Disable debug messages.
**    Can be changed at runtime too.
*/

#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
        #define DEBUG_FLAGS ncr_debug
#else
        #define DEBUG_FLAGS     SCSI_NCR_DEBUG_FLAGS
#endif



/*==========================================================
**
**      assert ()
**
**==========================================================
**
**      modified copy from 386bsd:/usr/include/sys/assert.h
**
**----------------------------------------------------------
*/

#define assert(expression) { \
        if (!(expression)) { \
                (void)printk(KERN_ERR \
                        "assertion \"%s\" failed: file \"%s\", line %d\n", \
                        #expression, \
                        __FILE__, __LINE__); \
        } \
}

/*==========================================================
**
**      Big/Little endian support.
**
**==========================================================
*/

/*
**      If the NCR uses big endian addressing mode over the 
**      PCI, actual io register addresses for byte and word 
**      accesses must be changed according to lane routing.
**      Btw, ncr_offb() and ncr_offw() macros only apply to 
**      constants and so donnot generate bloated code.
*/

#if     defined(SCSI_NCR_BIG_ENDIAN)

#define ncr_offb(o)     (((o)&~3)+((~((o)&3))&3))
#define ncr_offw(o)     (((o)&~3)+((~((o)&3))&2))

#else

#define ncr_offb(o)     (o)
#define ncr_offw(o)     (o)

#endif

/*
**      If the CPU and the NCR use same endian-ness addressing,
**      no byte reordering is needed for script patching.
**      Macro cpu_to_scr() is to be used for script patching.
**      Macro scr_to_cpu() is to be used for getting a DWORD 
**      from the script.
*/

#if     defined(__BIG_ENDIAN) && !defined(SCSI_NCR_BIG_ENDIAN)

#define cpu_to_scr(dw)  cpu_to_le32(dw)
#define scr_to_cpu(dw)  le32_to_cpu(dw)

#elif   defined(__LITTLE_ENDIAN) && defined(SCSI_NCR_BIG_ENDIAN)

#define cpu_to_scr(dw)  cpu_to_be32(dw)
#define scr_to_cpu(dw)  be32_to_cpu(dw)

#else

#define cpu_to_scr(dw)  (dw)
#define scr_to_cpu(dw)  (dw)

#endif

/*==========================================================
**
**      Access to the controller chip.
**
**      If NCR_IOMAPPED is defined, the driver will use 
**      normal IOs instead of the MEMORY MAPPED IO method  
**      recommended by PCI specifications.
**      If all PCI bridges, host brigdes and architectures 
**      would have been correctly designed for PCI, this 
**      option would be useless.
**
**==========================================================
*/

/*
**      If the CPU and the NCR use same endian-ness addressing,
**      no byte reordering is needed for accessing chip io 
**      registers. Functions suffixed by '_raw' are assumed 
**      to access the chip over the PCI without doing byte 
**      reordering. Functions suffixed by '_l2b' are 
**      assumed to perform little-endian to big-endian byte 
**      reordering, those suffixed by '_b2l' blah, blah,
**      blah, ...
*/

#if defined(NCR_IOMAPPED)

/*
**      IO mapped only input / ouput
*/

#define INB_OFF(o)              inb (np->port + ncr_offb(o))
#define OUTB_OFF(o, val)        outb ((val), np->port + ncr_offb(o))

#if     defined(__BIG_ENDIAN) && !defined(SCSI_NCR_BIG_ENDIAN)

#define INW_OFF(o)              inw_l2b (np->port + ncr_offw(o))
#define INL_OFF(o)              inl_l2b (np->port + (o))

#define OUTW_OFF(o, val)        outw_b2l ((val), np->port + ncr_offw(o))
#define OUTL_OFF(o, val)        outl_b2l ((val), np->port + (o))

#elif   defined(__LITTLE_ENDIAN) && defined(SCSI_NCR_BIG_ENDIAN)

#define INW_OFF(o)              inw_b2l (np->port + ncr_offw(o))
#define INL_OFF(o)              inl_b2l (np->port + (o))

#define OUTW_OFF(o, val)        outw_l2b ((val), np->port + ncr_offw(o))
#define OUTL_OFF(o, val)        outl_l2b ((val), np->port + (o))

#else

#define INW_OFF(o)              inw_raw (np->port + ncr_offw(o))
#define INL_OFF(o)              inl_raw (np->port + (o))

#define OUTW_OFF(o, val)        outw_raw ((val), np->port + ncr_offw(o))
#define OUTL_OFF(o, val)        outl_raw ((val), np->port + (o))

#endif  /* ENDIANs */

#else   /* defined NCR_IOMAPPED */

/*
**      MEMORY mapped IO input / output
*/

#define INB_OFF(o)              readb((char *)np->reg + ncr_offb(o))
#define OUTB_OFF(o, val)        writeb((val), (char *)np->reg + ncr_offb(o))

#if     defined(__BIG_ENDIAN) && !defined(SCSI_NCR_BIG_ENDIAN)

#define INW_OFF(o)              readw_l2b((char *)np->reg + ncr_offw(o))
#define INL_OFF(o)              readl_l2b((char *)np->reg + (o))

#define OUTW_OFF(o, val)        writew_b2l((val), (char *)np->reg + ncr_offw(o))
#define OUTL_OFF(o, val)        writel_b2l((val), (char *)np->reg + (o))

#elif   defined(__LITTLE_ENDIAN) && defined(SCSI_NCR_BIG_ENDIAN)

#define INW_OFF(o)              readw_b2l((char *)np->reg + ncr_offw(o))
#define INL_OFF(o)              readl_b2l((char *)np->reg + (o))

#define OUTW_OFF(o, val)        writew_l2b((val), (char *)np->reg + ncr_offw(o))
#define OUTL_OFF(o, val)        writel_l2b((val), (char *)np->reg + (o))

#else

#define INW_OFF(o)              readw_raw((char *)np->reg + ncr_offw(o))
#define INL_OFF(o)              readl_raw((char *)np->reg + (o))

#define OUTW_OFF(o, val)        writew_raw((val), (char *)np->reg + ncr_offw(o))
#define OUTL_OFF(o, val)        writel_raw((val), (char *)np->reg + (o))

#endif

#endif  /* defined NCR_IOMAPPED */

#define INB(r)          INB_OFF (offsetof(struct ncr_reg,r))
#define INW(r)          INW_OFF (offsetof(struct ncr_reg,r))
#define INL(r)          INL_OFF (offsetof(struct ncr_reg,r))

#define OUTB(r, val)    OUTB_OFF (offsetof(struct ncr_reg,r), (val))
#define OUTW(r, val)    OUTW_OFF (offsetof(struct ncr_reg,r), (val))
#define OUTL(r, val)    OUTL_OFF (offsetof(struct ncr_reg,r), (val))

/*
**      Set bit field ON, OFF 
*/

#define OUTONB(r, m)    OUTB(r, INB(r) | (m))
#define OUTOFFB(r, m)   OUTB(r, INB(r) & ~(m))
#define OUTONW(r, m)    OUTW(r, INW(r) | (m))
#define OUTOFFW(r, m)   OUTW(r, INW(r) & ~(m))
#define OUTONL(r, m)    OUTL(r, INL(r) | (m))
#define OUTOFFL(r, m)   OUTL(r, INL(r) & ~(m))


/*==========================================================
**
**      Command control block states.
**
**==========================================================
*/

#define HS_IDLE         (0)
#define HS_BUSY         (1)
#define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
#define HS_DISCONNECT   (3)     /* Disconnected by target */

#define HS_DONEMASK     (0x80)
#define HS_COMPLETE     (4|HS_DONEMASK)
#define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
#define HS_RESET        (6|HS_DONEMASK) /* SCSI reset             */
#define HS_ABORTED      (7|HS_DONEMASK) /* Transfer aborted       */
#define HS_TIMEOUT      (8|HS_DONEMASK) /* Software timeout       */
#define HS_FAIL         (9|HS_DONEMASK) /* SCSI or PCI bus errors */
#define HS_UNEXPECTED   (10|HS_DONEMASK)/* Unexpected disconnect  */

/*
**      Invalid host status values used by the SCRIPTS processor 
**      when the nexus is not fully identified.
**      Shall never appear in a CCB.
*/

#define HS_INVALMASK    (0x40)
#define HS_SELECTING    (0|HS_INVALMASK)
#define HS_IN_RESELECT  (1|HS_INVALMASK)
#define HS_STARTING     (2|HS_INVALMASK)

/*
**      Flags set by the SCRIPT processor for commands 
**      that have been skipped.
*/
#define HS_SKIPMASK     (0x20)

/*==========================================================
**
**      Software Interrupt Codes
**
**==========================================================
*/

#define SIR_BAD_STATUS          (1)
#define SIR_XXXXXXXXXX          (2)
#define SIR_NEGO_SYNC           (3)
#define SIR_NEGO_WIDE           (4)
#define SIR_NEGO_FAILED         (5)
#define SIR_NEGO_PROTO          (6)
#define SIR_REJECT_RECEIVED     (7)
#define SIR_REJECT_SENT         (8)
#define SIR_IGN_RESIDUE         (9)
#define SIR_MISSING_SAVE        (10)
#define SIR_RESEL_NO_MSG_IN     (11)
#define SIR_RESEL_NO_IDENTIFY   (12)
#define SIR_RESEL_BAD_LUN       (13)
#define SIR_RESEL_BAD_TARGET    (14)
#define SIR_RESEL_BAD_I_T_L     (15)
#define SIR_RESEL_BAD_I_T_L_Q   (16)
#define SIR_DONE_OVERFLOW       (17)
#define SIR_MAX                 (17)

/*==========================================================
**
**      Extended error codes.
**      xerr_status field of struct ccb.
**
**==========================================================
*/

#define XE_OK           (0)
#define XE_EXTRA_DATA   (1)     /* unexpected data phase */
#define XE_BAD_PHASE    (2)     /* illegal phase (4/5)   */

/*==========================================================
**
**      Negotiation status.
**      nego_status field       of struct ccb.
**
**==========================================================
*/

#define NS_SYNC         (1)
#define NS_WIDE         (2)

/*==========================================================
**
**      "Special features" of targets.
**      quirks field            of struct tcb.
**      actualquirks field      of struct ccb.
**
**==========================================================
*/

#define QUIRK_AUTOSAVE  (0x01)
#define QUIRK_NOMSG     (0x02)
#define QUIRK_NOSYNC    (0x10)
#define QUIRK_NOWIDE16  (0x20)

/*==========================================================
**
**      Capability bits in Inquire response byte 7.
**
**==========================================================
*/

#define INQ7_QUEUE      (0x02)
#define INQ7_SYNC       (0x10)
#define INQ7_WIDE16     (0x20)

/*==========================================================
**
**      Misc.
**
**==========================================================
*/

#define CCB_MAGIC       (0xf2691ad2)

/*==========================================================
**
**      Declaration of structs.
**
**==========================================================
*/

struct tcb;
struct lcb;
struct ccb;
struct ncb;
struct script;

typedef struct ncb * ncb_p;
typedef struct tcb * tcb_p;
typedef struct lcb * lcb_p;
typedef struct ccb * ccb_p;

struct link {
        ncrcmd  l_cmd;
        ncrcmd  l_paddr;
};

struct  usrcmd {
        u_long  target;
        u_long  lun;
        u_long  data;
        u_long  cmd;
};

#define UC_SETSYNC      10
#define UC_SETTAGS      11
#define UC_SETDEBUG     12
#define UC_SETORDER     13
#define UC_SETWIDE      14
#define UC_SETFLAG      15
#define UC_CLEARPROF    16
#define UC_SETVERBOSE   17

#define UF_TRACE        (0x01)
#define UF_NODISC       (0x02)
#define UF_NOSCAN       (0x04)

/*---------------------------------------
**
**      Timestamps for profiling
**
**---------------------------------------
*/

#ifdef SCSI_NCR_PROFILE_SUPPORT

struct tstamp {
        u_long start;
        u_long end;
        u_long command;
        u_long status;
        u_long disconnect;
        u_long reselect;
};

/*
**      profiling data (per device)
*/

struct profile {
        u_long  num_trans;
        u_long  num_kbytes;
        u_long  rest_bytes;
        u_long  num_disc;
        u_long  num_break;
        u_long  num_int;
        u_long  num_fly;
        u_long  ms_setup;
        u_long  ms_data;
        u_long  ms_disc;
        u_long  ms_post;
};
#endif

/*========================================================================
**
**      Declaration of structs:         target control block
**
**========================================================================
*/
struct tcb {
        /*----------------------------------------------------------------
        **      During reselection the ncr jumps to this point with SFBR 
        **      set to the encoded target number with bit 7 set.
        **      if it's not this target, jump to the next.
        **
        **      JUMP  IF (SFBR != #target#), @(next tcb)
        **----------------------------------------------------------------
        */
        struct link   jump_tcb;

        /*----------------------------------------------------------------
        **      Load the actual values for the sxfer and the scntl3
        **      register (sync/wide mode).
        **
        **      SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
        **      SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
        **----------------------------------------------------------------
        */
        ncrcmd  getscr[6];

        /*----------------------------------------------------------------
        **      Get the IDENTIFY message and load the LUN to SFBR.
        **
        **      CALL, <RESEL_LUN>
        **----------------------------------------------------------------
        */
        struct link   call_lun;

        /*----------------------------------------------------------------
        **      Now look for the right lun.
        **
        **      For i = 0 to 3
        **              SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
        **
        **      Recent chips will prefetch the 4 JUMPS using only 1 burst.
        **      It is kind of hashcoding.
        **----------------------------------------------------------------
        */
        struct link     jump_lcb[4];    /* JUMPs for reselection        */
        lcb_p           lp[MAX_LUN];    /* The lcb's of this tcb        */
        u_char          inq_done;       /* Target capabilities received */
        u_char          inq_byte7;      /* Contains these capabilities  */

        /*----------------------------------------------------------------
        **      Pointer to the ccb used for negotiation.
        **      Prevent from starting a negotiation for all queued commands 
        **      when tagged command queuing is enabled.
        **----------------------------------------------------------------
        */
        ccb_p   nego_cp;

        /*----------------------------------------------------------------
        **      statistical data
        **----------------------------------------------------------------
        */
        u_long  transfers;
        u_long  bytes;

        /*----------------------------------------------------------------
        **      negotiation of wide and synch transfer and device quirks.
        **----------------------------------------------------------------
        */
/*0*/   u_char  minsync;
/*1*/   u_char  sval;
/*2*/   u_short period;
/*0*/   u_char  maxoffs;
/*1*/   u_char  quirks;
/*2*/   u_char  widedone;
/*3*/   u_char  wval;

        /*----------------------------------------------------------------
        **      User settable limits and options.
        **      These limits are read from the NVRAM if present.
        **----------------------------------------------------------------
        */
        u_char  usrsync;
        u_char  usrwide;
        u_char  usrtags;
        u_char  usrflag;
};

/*========================================================================
**
**      Declaration of structs:         lun control block
**
**========================================================================
*/
struct lcb {
        /*----------------------------------------------------------------
        **      During reselection the ncr jumps to this point
        **      with SFBR set to the "Identify" message.
        **      if it's not this lun, jump to the next.
        **
        **      JUMP  IF (SFBR != #lun#), @(next lcb of this target)
        **
        **      It is this lun. Load TEMP with the nexus jumps table 
        **      address and jump to RESEL_TAG (or RESEL_NOTAG).
        **
        **              SCR_COPY (4), p_jump_ccb, TEMP,
        **              SCR_JUMP, <RESEL_TAG>
        **----------------------------------------------------------------
        */
        struct link     jump_lcb;
        ncrcmd          load_jump_ccb[3];
        struct link     jump_tag;
        ncrcmd          p_jump_ccb;     /* Jump table bus address       */

        /*----------------------------------------------------------------
        **      Jump table used by the script processor to directly jump 
        **      to the CCB corresponding to the reselected nexus.
        **      Address is allocated on 256 bytes boundary in order to 
        **      allow 8 bit calculation of the tag jump entry for up to 
        **      64 possible tags.
        **----------------------------------------------------------------
        */
        u_int32         jump_ccb_0;     /* Default table if no tags     */
        u_int32         *jump_ccb;      /* Virtual address              */

        /*----------------------------------------------------------------
        **      CCB queue management.
        **----------------------------------------------------------------
        */
        XPT_QUEHEAD     free_ccbq;      /* Queue of available CCBs      */
        XPT_QUEHEAD     busy_ccbq;      /* Queue of busy CCBs           */
        XPT_QUEHEAD     wait_ccbq;      /* Queue of waiting for IO CCBs */
        XPT_QUEHEAD     skip_ccbq;      /* Queue of skipped CCBs        */
        u_char          actccbs;        /* Number of allocated CCBs     */
        u_char          busyccbs;       /* CCBs busy for this lun       */
        u_char          queuedccbs;     /* CCBs queued to the controller*/
        u_char          queuedepth;     /* Queue depth for this lun     */
        u_char          scdev_depth;    /* SCSI device queue depth      */
        u_char          maxnxs;         /* Max possible nexuses         */

        /*----------------------------------------------------------------
        **      Control of tagged command queuing.
        **      Tags allocation is performed using a circular buffer.
        **      This avoids using a loop for tag allocation.
        **----------------------------------------------------------------
        */
        u_char          ia_tag;         /* Allocation index             */
        u_char          if_tag;         /* Freeing index                */
        u_char cb_tags[SCSI_NCR_MAX_TAGS];      /* Circular tags buffer */
        u_char          usetags;        /* Command queuing is active    */
        u_char          maxtags;        /* Max nr of tags asked by user */
        u_char          numtags;        /* Current number of tags       */
        u_char          inq_byte7;      /* Store unit CmdQ capabitility */

        /*----------------------------------------------------------------
        **      QUEUE FULL control and ORDERED tag control.
        **----------------------------------------------------------------
        */
        /*----------------------------------------------------------------
        **      QUEUE FULL and ORDERED tag control.
        **----------------------------------------------------------------
        */
        u_short         num_good;       /* Nr of GOOD since QUEUE FULL  */
        tagmap_t        tags_umap;      /* Used tags bitmap             */
        tagmap_t        tags_smap;      /* Tags in use at 'tag_stime'   */
        u_long          tags_stime;     /* Last time we set smap=umap   */
        ccb_p           held_ccb;       /* CCB held for QUEUE FULL      */
};

/*========================================================================
**
**      Declaration of structs:     the launch script.
**
**========================================================================
**
**      It is part of the CCB and is called by the scripts processor to 
**      start or restart the data structure (nexus).
**      This 6 DWORDs mini script makes use of prefetching.
**
**------------------------------------------------------------------------
*/
struct launch {
        /*----------------------------------------------------------------
        **      SCR_COPY(4),    @(p_phys), @(dsa register)
        **      SCR_JUMP,       @(scheduler_point)
        **----------------------------------------------------------------
        */
        ncrcmd          setup_dsa[3];   /* Copy 'phys' address to dsa   */
        struct link     schedule;       /* Jump to scheduler point      */
        ncrcmd          p_phys;         /* 'phys' header bus address    */
};

/*========================================================================
**
**      Declaration of structs:     global HEADER.
**
**========================================================================
**
**      This substructure is copied from the ccb to a global address after 
**      selection (or reselection) and copied back before disconnect.
**
**      These fields are accessible to the script processor.
**
**------------------------------------------------------------------------
*/

struct head {
        /*----------------------------------------------------------------
        **      Saved data pointer.
        **      Points to the position in the script responsible for the
        **      actual transfer transfer of data.
        **      It's written after reception of a SAVE_DATA_POINTER message.
        **      The goalpointer points after the last transfer command.
        **----------------------------------------------------------------
        */
        u_int32         savep;
        u_int32         lastp;
        u_int32         goalp;

        /*----------------------------------------------------------------
        **      Alternate data pointer.
        **      They are copied back to savep/lastp/goalp by the SCRIPTS 
        **      when the direction is unknown and the device claims data out.
        **----------------------------------------------------------------
        */
        u_int32         wlastp;
        u_int32         wgoalp;

        /*----------------------------------------------------------------
        **      The virtual address of the ccb containing this header.
        **----------------------------------------------------------------
        */
        ccb_p   cp;

#ifdef SCSI_NCR_PROFILE_SUPPORT
        /*----------------------------------------------------------------
        **      Space for some timestamps to gather profiling data.
        **----------------------------------------------------------------
        */
        struct tstamp   stamp;
#endif

        /*----------------------------------------------------------------
        **      Status fields.
        **----------------------------------------------------------------
        */
        u_char          scr_st[4];      /* script status                */
        u_char          status[4];      /* host status. must be the     */
                                        /*  last DWORD of the header.   */
};

/*
**      The status bytes are used by the host and the script processor.
**
**      The byte corresponding to the host_status must be stored in the 
**      last DWORD of the CCB header since it is used for command 
**      completion (ncr_wakeup()). Doing so, we are sure that the header 
**      has been entirely copied back to the CCB when the host_status is 
**      seen complete by the CPU.
**
**      The last four bytes (status[4]) are copied to the scratchb register
**      (declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
**      and copied back just after disconnecting.
**      Inside the script the XX_REG are used.
**
**      The first four bytes (scr_st[4]) are used inside the script by 
**      "COPY" commands.
**      Because source and destination must have the same alignment
**      in a DWORD, the fields HAVE to be at the choosen offsets.
**              xerr_st         0       (0x34)  scratcha
**              sync_st         1       (0x05)  sxfer
**              wide_st         3       (0x03)  scntl3
*/

/*
**      Last four bytes (script)
*/
#define  QU_REG scr0
#define  HS_REG scr1
#define  HS_PRT nc_scr1
#define  SS_REG scr2
#define  SS_PRT nc_scr2
#define  PS_REG scr3

/*
**      Last four bytes (host)
*/
#define  actualquirks  phys.header.status[0]
#define  host_status   phys.header.status[1]
#define  scsi_status   phys.header.status[2]
#define  parity_status phys.header.status[3]

/*
**      First four bytes (script)
*/
#define  xerr_st       header.scr_st[0]
#define  sync_st       header.scr_st[1]
#define  nego_st       header.scr_st[2]
#define  wide_st       header.scr_st[3]

/*
**      First four bytes (host)
*/
#define  xerr_status   phys.xerr_st
#define  nego_status   phys.nego_st

#if 0
#define  sync_status   phys.sync_st
#define  wide_status   phys.wide_st
#endif

/*==========================================================
**
**      Declaration of structs:     Data structure block
**
**==========================================================
**
**      During execution of a ccb by the script processor,
**      the DSA (data structure address) register points
**      to this substructure of the ccb.
**      This substructure contains the header with
**      the script-processor-changable data and
**      data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/

struct dsb {

        /*
        **      Header.
        */

        struct head     header;

        /*
        **      Table data for Script
        */

        struct scr_tblsel  select;
        struct scr_tblmove smsg  ;
        struct scr_tblmove cmd   ;
        struct scr_tblmove sense ;
        struct scr_tblmove data [MAX_SCATTER];
};


/*========================================================================
**
**      Declaration of structs:     Command control block.
**
**========================================================================
*/
struct ccb {
        /*----------------------------------------------------------------
        **      This is the data structure which is pointed by the DSA 
        **      register when it is executed by the script processor.
        **      It must be the first entry because it contains the header 
        **      as first entry that must be cache line aligned.
        **----------------------------------------------------------------
        */
        struct dsb      phys;

        /*----------------------------------------------------------------
        **      Mini-script used at CCB execution start-up.
        **      Load the DSA with the data structure address (phys) and 
        **      jump to SELECT. Jump to CANCEL if CCB is to be canceled.
        **----------------------------------------------------------------
        */
        struct launch   start;

        /*----------------------------------------------------------------
        **      Mini-script used at CCB relection to restart the nexus.
        **      Load the DSA with the data structure address (phys) and 
        **      jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
        **----------------------------------------------------------------
        */
        struct launch   restart;

        /*----------------------------------------------------------------
        **      If a data transfer phase is terminated too early
        **      (after reception of a message (i.e. DISCONNECT)),
        **      we have to prepare a mini script to transfer
        **      the rest of the data.
        **----------------------------------------------------------------
        */
        ncrcmd          patch[8];

        /*----------------------------------------------------------------
        **      The general SCSI driver provides a
        **      pointer to a control block.
        **----------------------------------------------------------------
        */
        Scsi_Cmnd       *cmd;           /* SCSI command                 */
        u_long          tlimit;         /* Deadline for this job        */
        int             data_len;       /* Total data length            */

        /*----------------------------------------------------------------
        **      Message areas.
        **      We prepare a message to be sent after selection.
        **      We may use a second one if the command is rescheduled 
        **      due to GETCC or QFULL.
        **      Contents are IDENTIFY and SIMPLE_TAG.
        **      While negotiating sync or wide transfer,
        **      a SDTR or WDTR message is appended.
        **----------------------------------------------------------------
        */
        u_char          scsi_smsg [8];
        u_char          scsi_smsg2[8];

        /*----------------------------------------------------------------
        **      Other fields.
        **----------------------------------------------------------------
        */
        u_long          p_ccb;          /* BUS address of this CCB      */
        u_char          sensecmd[6];    /* Sense command                */
        u_char          tag;            /* Tag for this transfer        */
                                        /*  255 means no tag            */
        u_char          target;
        u_char          lun;
        u_char          queued;
        u_char          auto_sense;
        ccb_p           link_ccb;       /* Host adapter CCB chain       */
        XPT_QUEHEAD     link_ccbq;      /* Link to unit CCB queue       */
        u_int32         startp;         /* Initial data pointer         */
        u_long          magic;          /* Free / busy  CCB flag        */
};

#define CCB_PHYS(cp,lbl)        (cp->p_ccb + offsetof(struct ccb, lbl))


/*========================================================================
**
**      Declaration of structs:     NCR device descriptor
**
**========================================================================
*/
struct ncb {
        /*----------------------------------------------------------------
        **      The global header.
        **      It is accessible to both the host and the script processor.
        **      Must be cache line size aligned (32 for x86) in order to 
        **      allow cache line bursting when it is copied to/from CCB.
        **----------------------------------------------------------------
        */
        struct head     header;

        /*----------------------------------------------------------------
        **      CCBs management queues.
        **----------------------------------------------------------------
        */
        Scsi_Cmnd       *waiting_list;  /* Commands waiting for a CCB   */
                                        /*  when lcb is not allocated.  */
        Scsi_Cmnd       *done_list;     /* Commands waiting for done()  */
                                        /* callback to be invoked.      */ 
#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,93)
        spinlock_t      smp_lock;       /* Lock for SMP threading       */
#endif

        /*----------------------------------------------------------------
        **      Chip and controller indentification.
        **----------------------------------------------------------------
        */
        int             unit;           /* Unit number                  */
        char            chip_name[8];   /* Chip name                    */
        char            inst_name[16];  /* ncb instance name            */

        /*----------------------------------------------------------------
        **      Initial value of some IO register bits.
        **      These values are assumed to have been set by BIOS, and may 
        **      be used for probing adapter implementation differences.
        **----------------------------------------------------------------
        */
        u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
                sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;

        /*----------------------------------------------------------------
        **      Actual initial value of IO register bits used by the 
        **      driver. They are loaded at initialisation according to  
        **      features that are to be enabled.
        **----------------------------------------------------------------
        */
        u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4, 
                rv_ctest5, rv_stest2;

        /*----------------------------------------------------------------
        **      Targets management.
        **      During reselection the ncr jumps to jump_tcb.
        **      The SFBR register is loaded with the encoded target id.
        **      For i = 0 to 3
        **              SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
        **
        **      Recent chips will prefetch the 4 JUMPS using only 1 burst.
        **      It is kind of hashcoding.
        **----------------------------------------------------------------
        */
        struct link     jump_tcb[4];    /* JUMPs for reselection        */
        struct tcb  target[MAX_TARGET]; /* Target data                  */

        /*----------------------------------------------------------------
        **      Virtual and physical bus addresses of the chip.
        **----------------------------------------------------------------
        */
        vm_offset_t     vaddr;          /* Virtual and bus address of   */
        vm_offset_t     paddr;          /*  chip's IO registers.        */
        vm_offset_t     paddr2;         /* On-chip RAM bus address.     */
        volatile                        /* Pointer to volatile for      */
        struct ncr_reg  *reg;           /*  memory mapped IO.           */

        /*----------------------------------------------------------------
        **      SCRIPTS virtual and physical bus addresses.
        **      'script'  is loaded in the on-chip RAM if present.
        **      'scripth' stays in main memory.
        **----------------------------------------------------------------
        */
        struct script   *script0;       /* Copies of script and scripth */
        struct scripth  *scripth0;      /*  relocated for this ncb.     */
        struct scripth  *scripth;       /* Actual scripth virt. address */
        u_long          p_script;       /* Actual script and scripth    */
        u_long          p_scripth;      /*  bus addresses.              */

        /*----------------------------------------------------------------
        **      General controller parameters and configuration.
        **----------------------------------------------------------------
        */
        u_short         device_id;      /* PCI device id                */
        u_char          revision_id;    /* PCI device revision id       */
        u_long          port;           /* IO space base address        */
        u_int           irq;            /* IRQ level                    */
        u_int           features;       /* Chip features map            */
        u_char          myaddr;         /* SCSI id of the adapter       */
        u_char          maxburst;       /* log base 2 of dwords burst   */
        u_char          maxwide;        /* Maximum transfer width       */
        u_char          minsync;        /* Minimum sync period factor   */
        u_char          maxsync;        /* Maximum sync period factor   */
        u_char          maxoffs;        /* Max scsi offset              */
        u_char          multiplier;     /* Clock multiplier (1,2,4)     */
        u_char          clock_divn;     /* Number of clock divisors     */
        u_long          clock_khz;      /* SCSI clock frequency in KHz  */

        /*----------------------------------------------------------------
        **      Start queue management.
        **      It is filled up by the host processor and accessed by the 
        **      SCRIPTS processor in order to start SCSI commands.
        **----------------------------------------------------------------
        */
        u_short         squeueput;      /* Next free slot of the queue  */
        u_short         actccbs;        /* Number of allocated CCBs     */
        u_short         queuedccbs;     /* Number of CCBs in start queue*/
        u_short         queuedepth;     /* Start queue depth            */

        /*----------------------------------------------------------------
        **      Timeout handler.
        **----------------------------------------------------------------
        */
        struct timer_list timer;        /* Timer handler link header    */
        u_long          lasttime;
        u_long          settle_time;    /* Resetting the SCSI BUS       */

        /*----------------------------------------------------------------
        **      Debugging and profiling.
        **----------------------------------------------------------------
        */
        struct ncr_reg  regdump;        /* Register dump                */
        u_long          regtime;        /* Time it has been done        */
#ifdef SCSI_NCR_PROFILE_SUPPORT
        struct profile  profile;        /* Profiling data               */
        u_int           disc_phys;      /* Disconnection counters       */
        u_int           disc_ref;
#endif

        /*----------------------------------------------------------------
        **      Miscellaneous buffers accessed by the scripts-processor.
        **      They shall be DWORD aligned, because they may be read or 
        **      written with a SCR_COPY script command.
        **----------------------------------------------------------------
        */
        u_char          msgout[8];      /* Buffer for MESSAGE OUT       */
        u_char          msgin [8];      /* Buffer for MESSAGE IN        */
        u_int32         lastmsg;        /* Last SCSI message sent       */
        u_char          scratch;        /* Scratch for SCSI receive     */

        /*----------------------------------------------------------------
        **      Miscellaneous configuration and status parameters.
        **----------------------------------------------------------------
        */
        u_char          disc;           /* Diconnection allowed         */
        u_char          scsi_mode;      /* Current SCSI BUS mode        */
        u_char          order;          /* Tag order to use             */
        u_char          verbose;        /* Verbosity for this controller*/
        int             ncr_cache;      /* Used for cache test at init. */

        /*----------------------------------------------------------------
        **      Command completion handling.
        **----------------------------------------------------------------
        */
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
        struct ccb      *(ccb_done[MAX_DONE]);
        int             ccb_done_ic;
#endif
        /*----------------------------------------------------------------
        **      Fields that should be removed or changed.
        **----------------------------------------------------------------
        */
        struct ccb      *ccb;           /* Global CCB                   */
        struct usrcmd   user;           /* Command from user            */
        u_char          release_stage;  /* Synchronisation stage on release  */
};

#define NCB_SCRIPT_PHYS(np,lbl)  (np->p_script  + offsetof (struct script, lbl))
#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))

/*==========================================================
**
**
**      Script for NCR-Processor.
**
**      Use ncr_script_fill() to create the variable parts.
**      Use ncr_script_copy_and_bind() to make a copy and
**      bind to physical addresses.
**
**
**==========================================================
**
**      We have to know the offsets of all labels before
**      we reach them (for forward jumps).
**      Therefore we declare a struct here.
**      If you make changes inside the script,
**      DONT FORGET TO CHANGE THE LENGTHS HERE!
**
**----------------------------------------------------------
*/

/*
**      Script fragments which are loaded into the on-chip RAM 
**      of 825A, 875 and 895 chips.
*/
struct script {
        ncrcmd  start           [  5];
        ncrcmd  startpos        [  1];
        ncrcmd  select          [  6];
        ncrcmd  select2         [  9];
        ncrcmd  loadpos         [  4];
        ncrcmd  send_ident      [  9];
        ncrcmd  prepare         [  6];
        ncrcmd  prepare2        [  7];
#ifdef SCSI_NCR_PROFILE_SUPPORT
        ncrcmd  command         [  9];
#else
        ncrcmd  command         [  6];
#endif
        ncrcmd  dispatch        [ 32];
        ncrcmd  clrack          [  4];
        ncrcmd  no_data         [ 17];
#ifdef SCSI_NCR_PROFILE_SUPPORT
        ncrcmd  status          [ 11];
#else
        ncrcmd  status          [  8];
#endif
        ncrcmd  msg_in          [  2];
        ncrcmd  msg_in2         [ 16];
        ncrcmd  msg_bad         [  4];
        ncrcmd  setmsg          [  7];
        ncrcmd  cleanup         [  6];
        ncrcmd  complete        [  9];
        ncrcmd  cleanup_ok      [  8];
        ncrcmd  cleanup0        [  1];
#ifndef SCSI_NCR_CCB_DONE_SUPPORT
        ncrcmd  signal          [ 12];
#else
        ncrcmd  signal          [  9];
        ncrcmd  done_pos        [  1];
        ncrcmd  done_plug       [  2];
        ncrcmd  done_end        [  7];
#endif
        ncrcmd  save_dp         [  7];
        ncrcmd  restore_dp      [  5];
#ifdef SCSI_NCR_PROFILE_SUPPORT
        ncrcmd  disconnect      [ 28];
#else
        ncrcmd  disconnect      [ 17];
#endif
        ncrcmd  msg_out         [  9];
        ncrcmd  msg_out_done    [  7];
        ncrcmd  idle            [  2];
        ncrcmd  reselect        [  8];
        ncrcmd  reselected      [  8];
        ncrcmd  resel_dsa       [  6];
#ifdef SCSI_NCR_PROFILE_SUPPORT
        ncrcmd  loadpos1        [  7];
#else
        ncrcmd  loadpos1        [  4];
#endif
        ncrcmd  resel_lun       [  6];
        ncrcmd  resel_tag       [  6];
        ncrcmd  jump_to_nexus   [  4];
        ncrcmd  nexus_indirect  [  4];
        ncrcmd  resel_notag     [  4];
        ncrcmd  data_in         [MAX_SCATTERL * 4];
        ncrcmd  data_in2        [  4];
        ncrcmd  data_out        [MAX_SCATTERL * 4];
        ncrcmd  data_out2       [  4];
};

/*
**      Script fragments which stay in main memory for all chips.
*/
struct scripth {
        ncrcmd  tryloop         [MAX_START*2];
        ncrcmd  tryloop2        [  2];
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
        ncrcmd  done_queue      [MAX_DONE*5];
        ncrcmd  done_queue2     [  2];
#endif
        ncrcmd  select_no_atn   [  8];
        ncrcmd  cancel          [  4];
        ncrcmd  skip            [  9];
        ncrcmd  skip2           [ 19];
        ncrcmd  par_err_data_in [  6];
        ncrcmd  par_err_other   [  4];
        ncrcmd  msg_reject      [  8];
        ncrcmd  msg_ign_residue [ 24];
        ncrcmd  msg_extended    [ 10];
        ncrcmd  msg_ext_2       [ 10];
        ncrcmd  msg_wdtr        [ 14];
        ncrcmd  send_wdtr       [  7];
        ncrcmd  msg_ext_3       [ 10];
        ncrcmd  msg_sdtr        [ 14];
        ncrcmd  send_sdtr       [  7];
        ncrcmd  nego_bad_phase  [  4];
        ncrcmd  msg_out_abort   [ 10];
        ncrcmd  hdata_in        [MAX_SCATTERH * 4];
        ncrcmd  hdata_in2       [  2];
        ncrcmd  hdata_out       [MAX_SCATTERH * 4];
        ncrcmd  hdata_out2      [  2];
        ncrcmd  reset           [  4];
        ncrcmd  aborttag        [  4];
        ncrcmd  abort           [  2];
        ncrcmd  abort_resel     [ 20];
        ncrcmd  resend_ident    [  4];
        ncrcmd  clratn_go_on    [  3];
        ncrcmd  nxtdsp_go_on    [  1];
        ncrcmd  sdata_in        [  8];
        ncrcmd  data_io         [ 18];
        ncrcmd  bad_identify    [ 12];
        ncrcmd  bad_i_t_l       [  4];
        ncrcmd  bad_i_t_l_q     [  4];
        ncrcmd  bad_target      [  8];
        ncrcmd  bad_status      [  8];
        ncrcmd  start_ram       [  4];
        ncrcmd  start_ram0      [  4];
        ncrcmd  sto_restart     [  5];
        ncrcmd  snooptest       [  9];
        ncrcmd  snoopend        [  2];
};

/*==========================================================
**
**
**      Function headers.
**
**
**==========================================================
*/

static  void    ncr_alloc_ccb   (ncb_p np, u_char tn, u_char ln);
static  void    ncr_complete    (ncb_p np, ccb_p cp);
static  void    ncr_exception   (ncb_p np);
static  void    ncr_free_ccb    (ncb_p np, ccb_p cp);
static  void    ncr_init_ccb    (ncb_p np, ccb_p cp);
static  void    ncr_init_tcb    (ncb_p np, u_char tn);
static  lcb_p   ncr_alloc_lcb   (ncb_p np, u_char tn, u_char ln);
static  lcb_p   ncr_setup_lcb   (ncb_p np, u_char tn, u_char ln,
                                 u_char *inq_data);
static  void    ncr_getclock    (ncb_p np, int mult);
static  void    ncr_selectclock (ncb_p np, u_char scntl3);
static  ccb_p   ncr_get_ccb     (ncb_p np, u_char tn, u_char ln);
static  void    ncr_init        (ncb_p np, int reset, char * msg, u_long code);
static  int     ncr_int_sbmc    (ncb_p np);
static  int     ncr_int_par     (ncb_p np);
static  void    ncr_int_ma      (ncb_p np);
static  void    ncr_int_sir     (ncb_p np);
static  void    ncr_int_sto     (ncb_p np);
static  u_long  ncr_lookup      (char* id);
static  void    ncr_negotiate   (struct ncb* np, struct tcb* tp);

#ifdef SCSI_NCR_PROFILE_SUPPORT
static  void    ncb_profile     (ncb_p np, ccb_p cp);
#endif

static  void    ncr_script_copy_and_bind
                                (ncb_p np, ncrcmd *src, ncrcmd *dst, int len);
static  void    ncr_script_fill (struct script * scr, struct scripth * scripth);
static  int     ncr_scatter     (ccb_p cp, Scsi_Cmnd *cmd);
static  void    ncr_getsync     (ncb_p np, u_char sfac, u_char *fakp, u_char *scntl3p);
static  void    ncr_setsync     (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer);
static  void    ncr_setup_tags  (ncb_p np, u_char tn, u_char ln);
static  void    ncr_setwide     (ncb_p np, ccb_p cp, u_char wide, u_char ack);
static  int     ncr_show_msg    (u_char * msg);
static  int     ncr_snooptest   (ncb_p np);
static  void    ncr_timeout     (ncb_p np);
static  void    ncr_wakeup      (ncb_p np, u_long code);
static  void    ncr_wakeup_done (ncb_p np);
static  void    ncr_start_next_ccb (ncb_p np, lcb_p lp, int maxn);
static  void    ncr_put_start_queue(ncb_p np, ccb_p cp);
static  void    ncr_start_reset (ncb_p np);
static  int     ncr_reset_scsi_bus (ncb_p np, int enab_int, int settle_delay);

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT
static  void    ncr_usercmd     (ncb_p np);
#endif

static int ncr_attach (Scsi_Host_Template *tpnt, int unit, ncr_device *device);

static void insert_into_waiting_list(ncb_p np, Scsi_Cmnd *cmd);
static Scsi_Cmnd *retrieve_from_waiting_list(int to_remove, ncb_p np, Scsi_Cmnd *cmd);
static void process_waiting_list(ncb_p np, int sts);

#define remove_from_waiting_list(np, cmd) \
                retrieve_from_waiting_list(1, (np), (cmd))
#define requeue_waiting_list(np) process_waiting_list((np), DID_OK)
#define reset_waiting_list(np) process_waiting_list((np), DID_RESET)

#ifdef SCSI_NCR_NVRAM_SUPPORT
static  int     ncr_get_Symbios_nvram   (ncr_slot *np, Symbios_nvram *nvram);
static  int     ncr_get_Tekram_nvram    (ncr_slot *np, Tekram_nvram *nvram);
#endif

/*==========================================================
**
**
**      Global static data.
**
**
**==========================================================
*/

#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
static int ncr_debug = SCSI_NCR_DEBUG_FLAGS;
#endif

static inline char *ncr_name (ncb_p np)
{
        return np->inst_name;
}


/*==========================================================
**
**
**      Scripts for NCR-Processor.
**
**      Use ncr_script_bind for binding to physical addresses.
**
**
**==========================================================
**
**      NADDR generates a reference to a field of the controller data.
**      PADDR generates a reference to another part of the script.
**      RADDR generates a reference to a script processor register.
**      FADDR generates a reference to a script processor register
**              with offset.
**
**----------------------------------------------------------
*/

#define RELOC_SOFTC     0x40000000
#define RELOC_LABEL     0x50000000
#define RELOC_REGISTER  0x60000000
#define RELOC_KVAR      0x70000000
#define RELOC_LABELH    0x80000000
#define RELOC_MASK      0xf0000000

#define NADDR(label)    (RELOC_SOFTC | offsetof(struct ncb, label))
#define PADDR(label)    (RELOC_LABEL | offsetof(struct script, label))
#define PADDRH(label)   (RELOC_LABELH | offsetof(struct scripth, label))
#define RADDR(label)    (RELOC_REGISTER | REG(label))
#define FADDR(label,ofs)(RELOC_REGISTER | ((REG(label))+(ofs)))
#define KVAR(which)     (RELOC_KVAR | (which))

#define SCRIPT_KVAR_JIFFIES     (0)

#define SCRIPT_KVAR_FIRST               SCRIPT_KVAR_JIFFIES
#define SCRIPT_KVAR_LAST                SCRIPT_KVAR_JIFFIES

/*
 * Kernel variables referenced in the scripts.
 * THESE MUST ALL BE ALIGNED TO A 4-BYTE BOUNDARY.
 */
static void *script_kvars[] __initdata =
        { (void *)&jiffies };

static  struct script script0 __initdata = {
/*--------------------------< START >-----------------------*/ {
        /*
        **      This NOP will be patched with LED ON
        **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
        */
        SCR_NO_OP,
                0,
        /*
        **      Clear SIGP.
        */
        SCR_FROM_REG (ctest2),
                0,
        /*
        **      Then jump to a certain point in tryloop.
        **      Due to the lack of indirect addressing the code
        **      is self modifying here.
        */
        SCR_JUMP,
}/*-------------------------< STARTPOS >--------------------*/,{
                PADDRH(tryloop),

}/*-------------------------< SELECT >----------------------*/,{
        /*
        **      DSA     contains the address of a scheduled
        **              data structure.
        **
        **      SCRATCHA contains the address of the script,
        **              which starts the next entry.
        **
        **      Set Initiator mode.
        **
        **      (Target mode is left as an exercise for the reader)
        */

        SCR_CLR (SCR_TRG),
                0,
        SCR_LOAD_REG (HS_REG, HS_SELECTING),
                0,

        /*
        **      And try to select this target.
        */
        SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
                PADDR (reselect),

}/*-------------------------< SELECT2 >----------------------*/,{
        /*
        **      Now there are 4 possibilities:
        **
        **      (1) The ncr looses arbitration.
        **      This is ok, because it will try again,
        **      when the bus becomes idle.
        **      (But beware of the timeout function!)
        **
        **      (2) The ncr is reselected.
        **      Then the script processor takes the jump
        **      to the RESELECT label.
        **
        **      (3) The ncr wins arbitration.
        **      Then it will execute SCRIPTS instruction until 
        **      the next instruction that checks SCSI phase.
        **      Then will stop and wait for selection to be 
        **      complete or selection time-out to occur.
        **      As a result the SCRIPTS instructions until 
        **      LOADPOS + 2 should be executed in parallel with 
        **      the SCSI core performing selection.
        */

        /*
        **      The M_REJECT problem seems to be due to a selection 
        **      timing problem.
        **      Wait immediately for the selection to complete. 
        **      (2.5x behaves so)
        */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                0,

        /*
        **      Next time use the next slot.
        */
        SCR_COPY (4),
                RADDR (temp),
                PADDR (startpos),
        /*
        **      The ncr doesn't have an indirect load
        **      or store command. So we have to
        **      copy part of the control block to a
        **      fixed place, where we can access it.
        **
        **      We patch the address part of a
        **      COPY command with the DSA-register.
        */
        SCR_COPY_F (4),
                RADDR (dsa),
                PADDR (loadpos),
        /*
        **      then we do the actual copy.
        */
        SCR_COPY (sizeof (struct head)),
        /*
        **      continued after the next label ...
        */
}/*-------------------------< LOADPOS >---------------------*/,{
                0,
                NADDR (header),
        /*
        **      Wait for the next phase or the selection
        **      to complete or time-out.
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDR (prepare),

}/*-------------------------< SEND_IDENT >----------------------*/,{
        /*
        **      Selection complete.
        **      Send the IDENTIFY and SIMPLE_TAG messages
        **      (and the M_X_SYNC_REQ message)
        */
        SCR_MOVE_TBL ^ SCR_MSG_OUT,
                offsetof (struct dsb, smsg),
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
                PADDRH (resend_ident),
        SCR_LOAD_REG (scratcha, 0x80),
                0,
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (lastmsg),
}/*-------------------------< PREPARE >----------------------*/,{
        /*
        **      load the savep (saved pointer) into
        **      the TEMP register (actual pointer)
        */
        SCR_COPY (4),
                NADDR (header.savep),
                RADDR (temp),
        /*
        **      Initialize the status registers
        */
        SCR_COPY (4),
                NADDR (header.status),
                RADDR (scr0),
}/*-------------------------< PREPARE2 >---------------------*/,{
        /*
        **      Initialize the msgout buffer with a NOOP message.
        */
        SCR_LOAD_REG (scratcha, M_NOOP),
                0,
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (msgout),
#if 0
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (msgin),
#endif
        /*
        **      Anticipate the COMMAND phase.
        **      This is the normal case for initial selection.
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
                PADDR (dispatch),

}/*-------------------------< COMMAND >--------------------*/,{
#ifdef SCSI_NCR_PROFILE_SUPPORT
        /*
        **      ... set a timestamp ...
        */
        SCR_COPY (sizeof (u_long)),
                KVAR(SCRIPT_KVAR_JIFFIES),
                NADDR (header.stamp.command),
#endif
        /*
        **      ... and send the command
        */
        SCR_MOVE_TBL ^ SCR_COMMAND,
                offsetof (struct dsb, cmd),
        /*
        **      If status is still HS_NEGOTIATE, negotiation failed.
        **      We check this here, since we want to do that 
        **      only once.
        */
        SCR_FROM_REG (HS_REG),
                0,
        SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
                SIR_NEGO_FAILED,

}/*-----------------------< DISPATCH >----------------------*/,{
        /*
        **      MSG_IN is the only phase that shall be 
        **      entered at least once for each (re)selection.
        **      So we test it first.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
                PADDR (msg_in),

        SCR_RETURN ^ IFTRUE (IF (SCR_DATA_OUT)),
                0,
        /*
        **      DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 4.
        **      Possible data corruption during Memory Write and Invalidate.
        **      This work-around resets the addressing logic prior to the 
        **      start of the first MOVE of a DATA IN phase.
        **      (See README.ncr53c8xx for more information)
        */
        SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
                20,
        SCR_COPY (4),
                RADDR (scratcha),
                RADDR (scratcha),
        SCR_RETURN,
                0,
        SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
                PADDR (status),
        SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
                PADDR (command),
        SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
                PADDR (msg_out),
        /*
        **      Discard one illegal phase byte, if required.
        */
        SCR_LOAD_REG (scratcha, XE_BAD_PHASE),
                0,
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (xerr_st),
        SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_OUT)),
                8,
        SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
                NADDR (scratch),
        SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_IN)),
                8,
        SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
                NADDR (scratch),
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< CLRACK >----------------------*/,{
        /*
        **      Terminate possible pending message phase.
        */
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< NO_DATA >--------------------*/,{
        /*
        **      The target wants to tranfer too much data
        **      or in the wrong direction.
        **      Remember that in extended error.
        */
        SCR_LOAD_REG (scratcha, XE_EXTRA_DATA),
                0,
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (xerr_st),
        /*
        **      Discard one data byte, if required.
        */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
                8,
        SCR_MOVE_ABS (1) ^ SCR_DATA_OUT,
                NADDR (scratch),
        SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
                8,
        SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
                NADDR (scratch),
        /*
        **      .. and repeat as required.
        */
        SCR_CALL,
                PADDR (dispatch),
        SCR_JUMP,
                PADDR (no_data),

}/*-------------------------< STATUS >--------------------*/,{
#ifdef SCSI_NCR_PROFILE_SUPPORT
        /*
        **      set the timestamp.
        */
        SCR_COPY (sizeof (u_long)),
                KVAR(SCRIPT_KVAR_JIFFIES),
                NADDR (header.stamp.status),
#endif
        /*
        **      get the status
        */
        SCR_MOVE_ABS (1) ^ SCR_STATUS,
                NADDR (scratch),
        /*
        **      save status to scsi_status.
        **      mark as complete.
        */
        SCR_TO_REG (SS_REG),
                0,
        SCR_LOAD_REG (HS_REG, HS_COMPLETE),
                0,
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< MSG_IN >--------------------*/,{
        /*
        **      Get the first byte of the message
        **      and save it to SCRATCHA.
        **
        **      The script processor doesn't negate the
        **      ACK signal after this transfer.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[0]),
}/*-------------------------< MSG_IN2 >--------------------*/,{
        /*
        **      Handle this message.
        */
        SCR_JUMP ^ IFTRUE (DATA (M_COMPLETE)),
                PADDR (complete),
        SCR_JUMP ^ IFTRUE (DATA (M_DISCONNECT)),
                PADDR (disconnect),
        SCR_JUMP ^ IFTRUE (DATA (M_SAVE_DP)),
                PADDR (save_dp),
        SCR_JUMP ^ IFTRUE (DATA (M_RESTORE_DP)),
                PADDR (restore_dp),
        SCR_JUMP ^ IFTRUE (DATA (M_EXTENDED)),
                PADDRH (msg_extended),
        SCR_JUMP ^ IFTRUE (DATA (M_NOOP)),
                PADDR (clrack),
        SCR_JUMP ^ IFTRUE (DATA (M_REJECT)),
                PADDRH (msg_reject),
        SCR_JUMP ^ IFTRUE (DATA (M_IGN_RESIDUE)),
                PADDRH (msg_ign_residue),
        /*
        **      Rest of the messages left as
        **      an exercise ...
        **
        **      Unimplemented messages:
        **      fall through to MSG_BAD.
        */
}/*-------------------------< MSG_BAD >------------------*/,{
        /*
        **      unimplemented message - reject it.
        */
        SCR_INT,
                SIR_REJECT_SENT,
        SCR_LOAD_REG (scratcha, M_REJECT),
                0,
}/*-------------------------< SETMSG >----------------------*/,{
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (msgout),
        SCR_SET (SCR_ATN),
                0,
        SCR_JUMP,
                PADDR (clrack),
}/*-------------------------< CLEANUP >-------------------*/,{
        /*
        **      dsa:    Pointer to ccb
        **            or xxxxxxFF (no ccb)
        **
        **      HS_REG:   Host-Status (<>0!)
        */
        SCR_FROM_REG (dsa),
                0,
        SCR_JUMP ^ IFTRUE (DATA (0xff)),
                PADDR (start),
        /*
        **      dsa is valid.
        **      complete the cleanup.
        */
        SCR_JUMP,
                PADDR (cleanup_ok),

}/*-------------------------< COMPLETE >-----------------*/,{
        /*
        **      Complete message.
        **
        **      Copy TEMP register to LASTP in header.
        */
        SCR_COPY (4),
                RADDR (temp),
                NADDR (header.lastp),
        /*
        **      When we terminate the cycle by clearing ACK,
        **      the target may disconnect immediately.
        **
        **      We don't want to be told of an
        **      "unexpected disconnect",
        **      so we disable this feature.
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        /*
        **      Terminate cycle ...
        */
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        /*
        **      ... and wait for the disconnect.
        */
        SCR_WAIT_DISC,
                0,
}/*-------------------------< CLEANUP_OK >----------------*/,{
        /*
        **      Save host status to header.
        */
        SCR_COPY (4),
                RADDR (scr0),
                NADDR (header.status),
        /*
        **      and copy back the header to the ccb.
        */
        SCR_COPY_F (4),
                RADDR (dsa),
                PADDR (cleanup0),
        SCR_COPY (sizeof (struct head)),
                NADDR (header),
}/*-------------------------< CLEANUP0 >--------------------*/,{
                0,
}/*-------------------------< SIGNAL >----------------------*/,{
        /*
        **      if job not completed ...
        */
        SCR_FROM_REG (HS_REG),
                0,
        /*
        **      ... start the next command.
        */
        SCR_JUMP ^ IFTRUE (MASK (0, (HS_DONEMASK|HS_SKIPMASK))),
                PADDR(start),
        /*
        **      If command resulted in not GOOD status,
        **      call the C code if needed.
        */
        SCR_FROM_REG (SS_REG),
                0,
        SCR_CALL ^ IFFALSE (DATA (S_GOOD)),
                PADDRH (bad_status),

#ifndef SCSI_NCR_CCB_DONE_SUPPORT

        /*
        **      ... signal completion to the host
        */
        SCR_INT_FLY,
                0,
        /*
        **      Auf zu neuen Schandtaten!
        */
        SCR_JUMP,
                PADDR(start),

#else   /* defined SCSI_NCR_CCB_DONE_SUPPORT */

        /*
        **      ... signal completion to the host
        */
        SCR_JUMP,
}/*------------------------< DONE_POS >---------------------*/,{
                PADDRH (done_queue),
}/*------------------------< DONE_PLUG >--------------------*/,{
        SCR_INT,
                SIR_DONE_OVERFLOW,
}/*------------------------< DONE_END >---------------------*/,{
        SCR_INT_FLY,
                0,
        SCR_COPY (4),
                RADDR (temp),
                PADDR (done_pos),
        SCR_JUMP,
                PADDR (start),

#endif  /* SCSI_NCR_CCB_DONE_SUPPORT */

}/*-------------------------< SAVE_DP >------------------*/,{
        /*
        **      SAVE_DP message:
        **      Copy TEMP register to SAVEP in header.
        */
        SCR_COPY (4),
                RADDR (temp),
                NADDR (header.savep),
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< RESTORE_DP >---------------*/,{
        /*
        **      RESTORE_DP message:
        **      Copy SAVEP in header to TEMP register.
        */
        SCR_COPY (4),
                NADDR (header.savep),
                RADDR (temp),
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< DISCONNECT >---------------*/,{
        /*
        **      DISCONNECTing  ...
        **
        **      disable the "unexpected disconnect" feature,
        **      and remove the ACK signal.
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        /*
        **      Wait for the disconnect.
        */
        SCR_WAIT_DISC,
                0,
#ifdef SCSI_NCR_PROFILE_SUPPORT
        /*
        **      Profiling:
        **      Set a time stamp,
        **      and count the disconnects.
        */
        SCR_COPY (sizeof (u_long)),
                KVAR(SCRIPT_KVAR_JIFFIES),
                NADDR (header.stamp.disconnect),
        SCR_COPY (4),
                NADDR (disc_phys),
                RADDR (scratcha),
        SCR_REG_REG (scratcha, SCR_ADD, 0x01),
                0,
        SCR_COPY (4),
                RADDR (scratcha),
                NADDR (disc_phys),
#endif
        /*
        **      Status is: DISCONNECTED.
        */
        SCR_LOAD_REG (HS_REG, HS_DISCONNECT),
                0,
        /*
        **      If QUIRK_AUTOSAVE is set,
        **      do an "save pointer" operation.
        */
        SCR_FROM_REG (QU_REG),
                0,
        SCR_JUMP ^ IFFALSE (MASK (QUIRK_AUTOSAVE, QUIRK_AUTOSAVE)),
                PADDR (cleanup_ok),
        /*
        **      like SAVE_DP message:
        **      Copy TEMP register to SAVEP in header.
        */
        SCR_COPY (4),
                RADDR (temp),
                NADDR (header.savep),
        SCR_JUMP,
                PADDR (cleanup_ok),

}/*-------------------------< MSG_OUT >-------------------*/,{
        /*
        **      The target requests a message.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_COPY (1),
                NADDR (msgout),
                NADDR (lastmsg),
        /*
        **      If it was no ABORT message ...
        */
        SCR_JUMP ^ IFTRUE (DATA (M_ABORT)),
                PADDRH (msg_out_abort),
        /*
        **      ... wait for the next phase
        **      if it's a message out, send it again, ...
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
                PADDR (msg_out),
}/*-------------------------< MSG_OUT_DONE >--------------*/,{
        /*
        **      ... else clear the message ...
        */
        SCR_LOAD_REG (scratcha, M_NOOP),
                0,
        SCR_COPY (4),
                RADDR (scratcha),
                NADDR (msgout),
        /*
        **      ... and process the next phase
        */
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< IDLE >------------------------*/,{
        /*
        **      Nothing to do?
        **      Wait for reselect.
        **      This NOP will be patched with LED OFF
        **      SCR_REG_REG (gpreg, SCR_OR, 0x01)
        */
        SCR_NO_OP,
                0,
}/*-------------------------< RESELECT >--------------------*/,{
        /*
        **      make the DSA invalid.
        */
        SCR_LOAD_REG (dsa, 0xff),
                0,
        SCR_CLR (SCR_TRG),
                0,
        SCR_LOAD_REG (HS_REG, HS_IN_RESELECT),
                0,
        /*
        **      Sleep waiting for a reselection.
        **      If SIGP is set, special treatment.
        **
        **      Zu allem bereit ..
        */
        SCR_WAIT_RESEL,
                PADDR(start),
}/*-------------------------< RESELECTED >------------------*/,{
        /*
        **      This NOP will be patched with LED ON
        **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
        */
        SCR_NO_OP,
                0,
        /*
        **      ... zu nichts zu gebrauchen ?
        **
        **      load the target id into the SFBR
        **      and jump to the control block.
        **
        **      Look at the declarations of
        **      - struct ncb
        **      - struct tcb
        **      - struct lcb
        **      - struct ccb
        **      to understand what's going on.
        */
        SCR_REG_SFBR (ssid, SCR_AND, 0x8F),
                0,
        SCR_TO_REG (sdid),
                0,
        SCR_JUMP,
                NADDR (jump_tcb),

}/*-------------------------< RESEL_DSA >-------------------*/,{
        /*
        **      Ack the IDENTIFY or TAG previously received.
        */
        SCR_CLR (SCR_ACK),
                0,
        /*
        **      The ncr doesn't have an indirect load
        **      or store command. So we have to
        **      copy part of the control block to a
        **      fixed place, where we can access it.
        **
        **      We patch the address part of a
        **      COPY command with the DSA-register.
        */
        SCR_COPY_F (4),
                RADDR (dsa),
                PADDR (loadpos1),
        /*
        **      then we do the actual copy.
        */
        SCR_COPY (sizeof (struct head)),
        /*
        **      continued after the next label ...
        */

}/*-------------------------< LOADPOS1 >-------------------*/,{
                0,
                NADDR (header),
#ifdef SCSI_NCR_PROFILE_SUPPORT
        /*
        **      Set a time stamp for this reselection
        */
        SCR_COPY (sizeof (u_long)),
                KVAR(SCRIPT_KVAR_JIFFIES),
                NADDR (header.stamp.reselect),
#endif
        /*
        **      The DSA contains the data structure address.
        */
        SCR_JUMP,
                PADDR (prepare),

}/*-------------------------< RESEL_LUN >-------------------*/,{
        /*
        **      come back to this point
        **      to get an IDENTIFY message
        **      Wait for a msg_in phase.
        */
        SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
                SIR_RESEL_NO_MSG_IN,
        /*
        **      message phase.
        **      Read the data directly from the BUS DATA lines.
        **      This helps to support very old SCSI devices that 
        **      may reselect without sending an IDENTIFY.
        */
        SCR_FROM_REG (sbdl),
                0,
        /*
        **      It should be an Identify message.
        */
        SCR_RETURN,
                0,
}/*-------------------------< RESEL_TAG >-------------------*/,{
        /*
        **      Read IDENTIFY + SIMPLE + TAG using a single MOVE.
        **      Agressive optimization, is'nt it?
        **      No need to test the SIMPLE TAG message, since the 
        **      driver only supports conformant devices for tags. ;-)
        */
        SCR_MOVE_ABS (3) ^ SCR_MSG_IN,
                NADDR (msgin),
        /*
        **      Read the TAG from the SIDL.
        **      Still an aggressive optimization. ;-)
        **      Compute the CCB indirect jump address which 
        **      is (#TAG*2 & 0xfc) due to tag numbering using 
        **      1,3,5..MAXTAGS*2+1 actual values.
        */
        SCR_REG_SFBR (sidl, SCR_SHL, 0),
                0,
        SCR_SFBR_REG (temp, SCR_AND, 0xfc),
                0,
}/*-------------------------< JUMP_TO_NEXUS >-------------------*/,{
        SCR_COPY_F (4),
                RADDR (temp),
                PADDR (nexus_indirect),
        SCR_COPY (4),
}/*-------------------------< NEXUS_INDIRECT >-------------------*/,{
                0,
                RADDR (temp),
        SCR_RETURN,
                0,
}/*-------------------------< RESEL_NOTAG >-------------------*/,{
        /*
        **      No tag expected.
        **      Read an throw away the IDENTIFY.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin),
        SCR_JUMP,
                PADDR (jump_to_nexus),
}/*-------------------------< DATA_IN >--------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTERL parameter,
**      it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTERL >=========
**  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
**  ||          PADDR (dispatch),
**  ||  SCR_MOVE_TBL ^ SCR_DATA_IN,
**  ||          offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_IN2 >-------------------*/,{
        SCR_CALL,
                PADDR (dispatch),
        SCR_JUMP,
                PADDR (no_data),
}/*-------------------------< DATA_OUT >--------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTERL parameter,
**      it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTERL >=========
**  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
**  ||          PADDR (dispatch),
**  ||  SCR_MOVE_TBL ^ SCR_DATA_OUT,
**  ||          offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_OUT2 >-------------------*/,{
        SCR_CALL,
                PADDR (dispatch),
        SCR_JUMP,
                PADDR (no_data),
}/*--------------------------------------------------------*/
};

static  struct scripth scripth0 __initdata = {
/*-------------------------< TRYLOOP >---------------------*/{
/*
**      Start the next entry.
**      Called addresses point to the launch script in the CCB.
**      They are patched by the main processor.
**
**      Because the size depends on the
**      #define MAX_START parameter, it is filled
**      in at runtime.
**
**-----------------------------------------------------------
**
**  ##===========< I=0; i<MAX_START >===========
**  ||  SCR_CALL,
**  ||          PADDR (idle),
**  ##==========================================
**
**-----------------------------------------------------------
*/
0
}/*------------------------< TRYLOOP2 >---------------------*/,{
        SCR_JUMP,
                PADDRH(tryloop),

#ifdef SCSI_NCR_CCB_DONE_SUPPORT

}/*------------------------< DONE_QUEUE >-------------------*/,{
/*
**      Copy the CCB address to the next done entry.
**      Because the size depends on the
**      #define MAX_DONE parameter, it is filled
**      in at runtime.
**
**-----------------------------------------------------------
**
**  ##===========< I=0; i<MAX_DONE >===========
**  ||  SCR_COPY (sizeof(ccb_p)),
**  ||          NADDR (header.cp),
**  ||          NADDR (ccb_done[i]),
**  ||  SCR_CALL,
**  ||          PADDR (done_end),
**  ##==========================================
**
**-----------------------------------------------------------
*/
0
}/*------------------------< DONE_QUEUE2 >------------------*/,{
        SCR_JUMP,
                PADDRH (done_queue),

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
}/*------------------------< SELECT_NO_ATN >-----------------*/,{
        /*
        **      Set Initiator mode.
        **      And try to select this target without ATN.
        */

        SCR_CLR (SCR_TRG),
                0,
        SCR_LOAD_REG (HS_REG, HS_SELECTING),
                0,
        SCR_SEL_TBL ^ offsetof (struct dsb, select),
                PADDR (reselect),
        SCR_JUMP,
                PADDR (select2),

}/*-------------------------< CANCEL >------------------------*/,{

        SCR_LOAD_REG (scratcha, HS_ABORTED),
                0,
        SCR_JUMPR,
                8,
}/*-------------------------< SKIP >------------------------*/,{
        SCR_LOAD_REG (scratcha, 0),
                0,
        /*
        **      This entry has been canceled.
        **      Next time use the next slot.
        */
        SCR_COPY (4),
                RADDR (temp),
                PADDR (startpos),
        /*
        **      The ncr doesn't have an indirect load
        **      or store command. So we have to
        **      copy part of the control block to a
        **      fixed place, where we can access it.
        **
        **      We patch the address part of a
        **      COPY command with the DSA-register.
        */
        SCR_COPY_F (4),
                RADDR (dsa),
                PADDRH (skip2),
        /*
        **      then we do the actual copy.
        */
        SCR_COPY (sizeof (struct head)),
        /*
        **      continued after the next label ...
        */
}/*-------------------------< SKIP2 >---------------------*/,{
                0,
                NADDR (header),
        /*
        **      Initialize the status registers
        */
        SCR_COPY (4),
                NADDR (header.status),
                RADDR (scr0),
        /*
        **      Force host status.
        */
        SCR_FROM_REG (scratcha),
                0,
        SCR_JUMPR ^ IFFALSE (MASK (0, HS_DONEMASK)),
                16,
        SCR_REG_REG (HS_REG, SCR_OR, HS_SKIPMASK),
                0,
        SCR_JUMPR,
                8,
        SCR_TO_REG (HS_REG),
                0,
        SCR_LOAD_REG (SS_REG, S_GOOD),
                0,
        SCR_JUMP,
                PADDR (cleanup_ok),

},/*-------------------------< PAR_ERR_DATA_IN >---------------*/{
        /*
        **      Ignore all data in byte, until next phase
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
                PADDRH (par_err_other),
        SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
                NADDR (scratch),
        SCR_JUMPR,
                -24,
},/*-------------------------< PAR_ERR_OTHER >------------------*/{
        /*
        **      count it.
        */
        SCR_REG_REG (PS_REG, SCR_ADD, 0x01),
                0,
        /*
        **      jump to dispatcher.
        */
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< MSG_REJECT >---------------*/,{
        /*
        **      If a negotiation was in progress,
        **      negotiation failed.
        **      Otherwise, let the C code print 
        **      some message.
        */
        SCR_FROM_REG (HS_REG),
                0,
        SCR_INT ^ IFFALSE (DATA (HS_NEGOTIATE)),
                SIR_REJECT_RECEIVED,
        SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
                SIR_NEGO_FAILED,
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< MSG_IGN_RESIDUE >----------*/,{
        /*
        **      Terminate cycle
        */
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get residue size.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[1]),
        /*
        **      Size is 0 .. ignore message.
        */
        SCR_JUMP ^ IFTRUE (DATA (0)),
                PADDR (clrack),
        /*
        **      Size is not 1 .. have to interrupt.
        */
        SCR_JUMPR ^ IFFALSE (DATA (1)),
                40,
        /*
        **      Check for residue byte in swide register
        */
        SCR_FROM_REG (scntl2),
                0,
        SCR_JUMPR ^ IFFALSE (MASK (WSR, WSR)),
                16,
        /*
        **      There IS data in the swide register.
        **      Discard it.
        */
        SCR_REG_REG (scntl2, SCR_OR, WSR),
                0,
        SCR_JUMP,
                PADDR (clrack),
        /*
        **      Load again the size to the sfbr register.
        */
        SCR_FROM_REG (scratcha),
                0,
        SCR_INT,
                SIR_IGN_RESIDUE,
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< MSG_EXTENDED >-------------*/,{
        /*
        **      Terminate cycle
        */
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get length.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[1]),
        /*
        */
        SCR_JUMP ^ IFTRUE (DATA (3)),
                PADDRH (msg_ext_3),
        SCR_JUMP ^ IFFALSE (DATA (2)),
                PADDR (msg_bad),
}/*-------------------------< MSG_EXT_2 >----------------*/,{
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get extended message code.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[2]),
        SCR_JUMP ^ IFTRUE (DATA (M_X_WIDE_REQ)),
                PADDRH (msg_wdtr),
        /*
        **      unknown extended message
        */
        SCR_JUMP,
                PADDR (msg_bad)
}/*-------------------------< MSG_WDTR >-----------------*/,{
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get data bus width
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[3]),
        /*
        **      let the host do the real work.
        */
        SCR_INT,
                SIR_NEGO_WIDE,
        /*
        **      let the target fetch our answer.
        */
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDRH (nego_bad_phase),

}/*-------------------------< SEND_WDTR >----------------*/,{
        /*
        **      Send the M_X_WIDE_REQ
        */
        SCR_MOVE_ABS (4) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_COPY (1),
                NADDR (msgout),
                NADDR (lastmsg),
        SCR_JUMP,
                PADDR (msg_out_done),

}/*-------------------------< MSG_EXT_3 >----------------*/,{
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get extended message code.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[2]),
        SCR_JUMP ^ IFTRUE (DATA (M_X_SYNC_REQ)),
                PADDRH (msg_sdtr),
        /*
        **      unknown extended message
        */
        SCR_JUMP,
                PADDR (msg_bad)

}/*-------------------------< MSG_SDTR >-----------------*/,{
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        /*
        **      get period and offset
        */
        SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
                NADDR (msgin[3]),
        /*
        **      let the host do the real work.
        */
        SCR_INT,
                SIR_NEGO_SYNC,
        /*
        **      let the target fetch our answer.
        */
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDRH (nego_bad_phase),

}/*-------------------------< SEND_SDTR >-------------*/,{
        /*
        **      Send the M_X_SYNC_REQ
        */
        SCR_MOVE_ABS (5) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_COPY (1),
                NADDR (msgout),
                NADDR (lastmsg),
        SCR_JUMP,
                PADDR (msg_out_done),

}/*-------------------------< NEGO_BAD_PHASE >------------*/,{
        SCR_INT,
                SIR_NEGO_PROTO,
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< MSG_OUT_ABORT >-------------*/,{
        /*
        **      After ABORT message,
        **
        **      expect an immediate disconnect, ...
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        SCR_WAIT_DISC,
                0,
        /*
        **      ... and set the status to "ABORTED"
        */
        SCR_LOAD_REG (HS_REG, HS_ABORTED),
                0,
        SCR_JUMP,
                PADDR (cleanup),

}/*-------------------------< HDATA_IN >-------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTERH parameter,
**      it is filled in at runtime.
**
**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
**  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
**  ||          PADDR (dispatch),
**  ||  SCR_MOVE_TBL ^ SCR_DATA_IN,
**  ||          offsetof (struct dsb, data[ i]),
**  ##===================================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< HDATA_IN2 >------------------*/,{
        SCR_JUMP,
                PADDR (data_in),

}/*-------------------------< HDATA_OUT >-------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTERH parameter,
**      it is filled in at runtime.
**
**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
**  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
**  ||          PADDR (dispatch),
**  ||  SCR_MOVE_TBL ^ SCR_DATA_OUT,
**  ||          offsetof (struct dsb, data[ i]),
**  ##===================================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< HDATA_OUT2 >------------------*/,{
        SCR_JUMP,
                PADDR (data_out),

}/*-------------------------< RESET >----------------------*/,{
        /*
        **      Send a M_RESET message if bad IDENTIFY 
        **      received on reselection.
        */
        SCR_LOAD_REG (scratcha, M_ABORT_TAG),
                0,
        SCR_JUMP,
                PADDRH (abort_resel),
}/*-------------------------< ABORTTAG >-------------------*/,{
        /*
        **      Abort a wrong tag received on reselection.
        */
        SCR_LOAD_REG (scratcha, M_ABORT_TAG),
                0,
        SCR_JUMP,
                PADDRH (abort_resel),
}/*-------------------------< ABORT >----------------------*/,{
        /*
        **      Abort a reselection when no active CCB.
        */
        SCR_LOAD_REG (scratcha, M_ABORT),
                0,
}/*-------------------------< ABORT_RESEL >----------------*/,{
        SCR_COPY (1),
                RADDR (scratcha),
                NADDR (msgout),
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        /*
        **      and send it.
        **      we expect an immediate disconnect
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_COPY (1),
                NADDR (msgout),
                NADDR (lastmsg),
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        SCR_WAIT_DISC,
                0,
        SCR_JUMP,
                PADDR (start),
}/*-------------------------< RESEND_IDENT >-------------------*/,{
        /*
        **      The target stays in MSG OUT phase after having acked 
        **      Identify [+ Tag [+ Extended message ]]. Targets shall
        **      behave this way on parity error.
        **      We must send it again all the messages.
        */
        SCR_SET (SCR_ATN), /* Shall be asserted 2 deskew delays before the  */
                0,         /* 1rst ACK = 90 ns. Hope the NCR is'nt too fast */
        SCR_JUMP,
                PADDR (send_ident),
}/*-------------------------< CLRATN_GO_ON >-------------------*/,{
        SCR_CLR (SCR_ATN),
                0,
        SCR_JUMP,
}/*-------------------------< NXTDSP_GO_ON >-------------------*/,{
                0,
}/*-------------------------< SDATA_IN >-------------------*/,{
        SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
                PADDR (dispatch),
        SCR_MOVE_TBL ^ SCR_DATA_IN,
                offsetof (struct dsb, sense),
        SCR_CALL,
                PADDR (dispatch),
        SCR_JUMP,
                PADDR (no_data),
}/*-------------------------< DATA_IO >--------------------*/,{
        /*
        **      We jump here if the data direction was unknown at the 
        **      time we had to queue the command to the scripts processor.
        **      Pointers had been set as follow in this situation:
        **        savep   -->   DATA_IO
        **        lastp   -->   start pointer when DATA_IN
        **        goalp   -->   goal  pointer when DATA_IN
        **        wlastp  -->   start pointer when DATA_OUT
        **        wgoalp  -->   goal  pointer when DATA_OUT
        **      This script sets savep/lastp/goalp according to the 
        **      direction chosen by the target.
        */
        SCR_JUMPR ^ IFTRUE (WHEN (SCR_DATA_OUT)),
                32,
        /*
        **      Direction is DATA IN.
        **      Warning: we jump here, even when phase is DATA OUT.
        */
        SCR_COPY (4),
                NADDR (header.lastp),
                NADDR (header.savep),

        /*
        **      Jump to the SCRIPTS according to actual direction.
        */
        SCR_COPY (4),
                NADDR (header.savep),
                RADDR (temp),
        SCR_RETURN,
                0,
        /*
        **      Direction is DATA OUT.
        */
        SCR_COPY (4),
                NADDR (header.wlastp),
                NADDR (header.lastp),
        SCR_COPY (4),
                NADDR (header.wgoalp),
                NADDR (header.goalp),
        SCR_JUMPR,
                -64,
}/*-------------------------< BAD_IDENTIFY >---------------*/,{
        /*
        **      If message phase but not an IDENTIFY,
        **      get some help from the C code.
        **      Old SCSI device may behave so.
        */
        SCR_JUMPR ^ IFTRUE (MASK (0x80, 0x80)),
                16,
        SCR_INT,
                SIR_RESEL_NO_IDENTIFY,
        SCR_JUMP,
                PADDRH (reset),
        /*
        **      Message is an IDENTIFY, but lun is unknown.
        **      Read the message, since we got it directly 
        **      from the SCSI BUS data lines.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORT to clear all pending tasks.
        */
        SCR_INT,
                SIR_RESEL_BAD_LUN,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin),
        SCR_JUMP,
                PADDRH (abort),
}/*-------------------------< BAD_I_T_L >------------------*/,{
        /*
        **      We donnot have a task for that I_T_L.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORT message.
        */
        SCR_INT,
                SIR_RESEL_BAD_I_T_L,
        SCR_JUMP,
                PADDRH (abort),
}/*-------------------------< BAD_I_T_L_Q >----------------*/,{
        /*
        **      We donnot have a task that matches the tag.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORTTAG message.
        */
        SCR_INT,
                SIR_RESEL_BAD_I_T_L_Q,
        SCR_JUMP,
                PADDRH (aborttag),
}/*-------------------------< BAD_TARGET >-----------------*/,{
        /*
        **      We donnot know the target that reselected us.
        **      Grab the first message if any (IDENTIFY).
        **      Signal problem to C code for logging the event.
        **      M_RESET message.
        */
        SCR_INT,
                SIR_RESEL_BAD_TARGET,
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_IN)),
                8,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin),
        SCR_JUMP,
                PADDRH (reset),
}/*-------------------------< BAD_STATUS >-----------------*/,{
        /*
        **      If command resulted in either QUEUE FULL,
        **      CHECK CONDITION or COMMAND TERMINATED,
        **      call the C code.
        */
        SCR_INT ^ IFTRUE (DATA (S_QUEUE_FULL)),
                SIR_BAD_STATUS,
        SCR_INT ^ IFTRUE (DATA (S_CHECK_COND)),
                SIR_BAD_STATUS,
        SCR_INT ^ IFTRUE (DATA (S_TERMINATED)),
                SIR_BAD_STATUS,
        SCR_RETURN,
                0,
}/*-------------------------< START_RAM >-------------------*/,{
        /*
        **      Load the script into on-chip RAM, 
        **      and jump to start point.
        */
        SCR_COPY_F (4),
                RADDR (scratcha),
                PADDRH (start_ram0),
        SCR_COPY (sizeof (struct script)),
}/*-------------------------< START_RAM0 >--------------------*/,{
                0,
                PADDR (start),
        SCR_JUMP,
                PADDR (start),
}/*-------------------------< STO_RESTART >-------------------*/,{
        /*
        **
        **      Repair start queue (e.g. next time use the next slot) 
        **      and jump to start point.
        */
        SCR_COPY (4),
                RADDR (temp),
                PADDR (startpos),
        SCR_JUMP,
                PADDR (start),
}/*-------------------------< SNOOPTEST >-------------------*/,{
        /*
        **      Read the variable.
        */
        SCR_COPY (4),
                NADDR(ncr_cache),
                RADDR (scratcha),
        /*
        **      Write the variable.
        */
        SCR_COPY (4),
                RADDR (temp),
                NADDR(ncr_cache),
        /*
        **      Read back the variable.
        */
        SCR_COPY (4),
                NADDR(ncr_cache),
                RADDR (temp),
}/*-------------------------< SNOOPEND >-------------------*/,{
        /*
        **      And stop.
        */
        SCR_INT,
                99,
}/*--------------------------------------------------------*/
};

/*==========================================================
**
**
**      Fill in #define dependent parts of the script
**
**
**==========================================================
*/

void __init ncr_script_fill (struct script * scr, struct scripth * scrh)
{
        int     i;
        ncrcmd  *p;

        p = scrh->tryloop;
        for (i=0; i<MAX_START; i++) {
                *p++ =SCR_CALL;
                *p++ =PADDR (idle);
        };

        assert ((u_long)p == (u_long)&scrh->tryloop + sizeof (scrh->tryloop));

#ifdef SCSI_NCR_CCB_DONE_SUPPORT

        p = scrh->done_queue;
        for (i = 0; i<MAX_DONE; i++) {
                *p++ =SCR_COPY (sizeof(ccb_p));
                *p++ =NADDR (header.cp);
                *p++ =NADDR (ccb_done[i]);
                *p++ =SCR_CALL;
                *p++ =PADDR (done_end);
        }

        assert ((u_long)p ==(u_long)&scrh->done_queue+sizeof(scrh->done_queue));

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */

        p = scrh->hdata_in;
        for (i=0; i<MAX_SCATTERH; i++) {
                *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
                *p++ =PADDR (dispatch);
                *p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
                *p++ =offsetof (struct dsb, data[i]);
        };
        assert ((u_long)p == (u_long)&scrh->hdata_in + sizeof (scrh->hdata_in));

        p = scr->data_in;
        for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
                *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
                *p++ =PADDR (dispatch);
                *p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
                *p++ =offsetof (struct dsb, data[i]);
        };
        assert ((u_long)p == (u_long)&scr->data_in + sizeof (scr->data_in));

        p = scrh->hdata_out;
        for (i=0; i<MAX_SCATTERH; i++) {
                *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
                *p++ =PADDR (dispatch);
                *p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
                *p++ =offsetof (struct dsb, data[i]);
        };
        assert ((u_long)p==(u_long)&scrh->hdata_out + sizeof (scrh->hdata_out));

        p = scr->data_out;
        for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
                *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
                *p++ =PADDR (dispatch);
                *p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
                *p++ =offsetof (struct dsb, data[i]);
        };

        assert ((u_long)p == (u_long)&scr->data_out + sizeof (scr->data_out));
}

/*==========================================================
**
**
**      Copy and rebind a script.
**
**
**==========================================================
*/

static void __init ncr_script_copy_and_bind (ncb_p np, ncrcmd *src, ncrcmd *dst, int len)
{
        ncrcmd  opcode, new, old, tmp1, tmp2;
        ncrcmd  *start, *end;
        int relocs;
        int opchanged = 0;

        start = src;
        end = src + len/4;

        while (src < end) {

                opcode = *src++;
                *dst++ = cpu_to_scr(opcode);

                /*
                **      If we forget to change the length
                **      in struct script, a field will be
                **      padded with 0. This is an illegal
                **      command.
                */

                if (opcode == 0) {
                        printk (KERN_ERR "%s: ERROR0 IN SCRIPT at %d.\n",
                                ncr_name(np), (int) (src-start-1));
                        MDELAY (1000);
                };

                if (DEBUG_FLAGS & DEBUG_SCRIPT)
                        printk (KERN_DEBUG "%p:  <%x>\n",
                                (src-1), (unsigned)opcode);

                /*
                **      We don't have to decode ALL commands
                */
                switch (opcode >> 28) {

                case 0xc:
                        /*
                        **      COPY has TWO arguments.
                        */
                        relocs = 2;
                        tmp1 = src[0];
                        if ((tmp1 & RELOC_MASK) == RELOC_KVAR)
                                tmp1 = 0;
                        tmp2 = src[1];
                        if ((tmp2 & RELOC_MASK) == RELOC_KVAR)
                                tmp2 = 0;
                        if ((tmp1 ^ tmp2) & 3) {
                                printk (KERN_ERR"%s: ERROR1 IN SCRIPT at %d.\n",
                                        ncr_name(np), (int) (src-start-1));
                                MDELAY (1000);
                        }
                        /*
                        **      If PREFETCH feature not enabled, remove 
                        **      the NO FLUSH bit if present.
                        */
                        if ((opcode & SCR_NO_FLUSH) && !(np->features & FE_PFEN)) {
                                dst[-1] = cpu_to_scr(opcode & ~SCR_NO_FLUSH);
                                ++opchanged;
                        }
                        break;

                case 0x0:
                        /*
                        **      MOVE (absolute address)
                        */
                        relocs = 1;
                        break;

                case 0x8:
                        /*
                        **      JUMP / CALL
                        **      dont't relocate if relative :-)
                        */
                        if (opcode & 0x00800000)
                                relocs = 0;
                        else
                                relocs = 1;
                        break;

                case 0x4:
                case 0x5:
                case 0x6:
                case 0x7:
                        relocs = 1;
                        break;

                default:
                        relocs = 0;
                        break;
                };

                if (relocs) {
                        while (relocs--) {
                                old = *src++;

                                switch (old & RELOC_MASK) {
                                case RELOC_REGISTER:
                                        new = (old & ~RELOC_MASK)
                                                + bus_dvma_to_mem(np->paddr);
                                        break;
                                case RELOC_LABEL:
                                        new = (old & ~RELOC_MASK) + np->p_script;
                                        break;
                                case RELOC_LABELH:
                                        new = (old & ~RELOC_MASK) + np->p_scripth;
                                        break;
                                case RELOC_SOFTC:
                                        new = (old & ~RELOC_MASK) + vtophys(np);
                                        break;
                                case RELOC_KVAR:
                                        if (((old & ~RELOC_MASK) <
                                             SCRIPT_KVAR_FIRST) ||
                                            ((old & ~RELOC_MASK) >
                                             SCRIPT_KVAR_LAST))
                                                panic("ncr KVAR out of range");
                                        new = vtophys(script_kvars[old &
                                            ~RELOC_MASK]);
                                        break;
                                case 0:
                                        /* Don't relocate a 0 address. */
                                        if (old == 0) {
                                                new = old;
                                                break;
                                        }
                                        /* fall through */
                                default:
                                        panic("ncr_script_copy_and_bind: weird relocation %x\n", old);
                                        break;
                                }

                                *dst++ = cpu_to_scr(new);
                        }
                } else
                        *dst++ = cpu_to_scr(*src++);

        };
}

/*==========================================================
**
**
**      Auto configuration:  attach and init a host adapter.
**
**
**==========================================================
*/

/*
**      Linux host data structure
**
**      The script area is allocated in the host data structure
**      because kmalloc() returns NULL during scsi initialisations
**      with Linux 1.2.X
*/

struct host_data {
     struct ncb *ncb;

     char ncb_align[CACHE_LINE_SIZE-1]; /* Filler for alignment */
     struct ncb _ncb_data;

     char ccb_align[CACHE_LINE_SIZE-1]; /* Filler for alignment */
     struct ccb _ccb_data;

     char scr_align[CACHE_LINE_SIZE-1]; /* Filler for alignment */
     struct script script_data;

     struct scripth scripth_data;
};

/*
**      Print something which allows to retrieve the controler type, unit,
**      target, lun concerned by a kernel message.
*/

static void PRINT_TARGET(ncb_p np, int target)
{
        printk(KERN_INFO "%s-<%d,*>: ", ncr_name(np), target);
}

static void PRINT_LUN(ncb_p np, int target, int lun)
{
        printk(KERN_INFO "%s-<%d,%d>: ", ncr_name(np), target, lun);
}

static void PRINT_ADDR(Scsi_Cmnd *cmd)
{
        struct host_data *host_data = (struct host_data *) cmd->host->hostdata;
        PRINT_LUN(host_data->ncb, cmd->target, cmd->lun);
}

/*==========================================================
**
**      NCR chip clock divisor table.
**      Divisors are multiplied by 10,000,000 in order to make 
**      calculations more simple.
**
**==========================================================
*/

#define _5M 5000000
static u_long div_10M[] =
        {2*_5M, 3*_5M, 4*_5M, 6*_5M, 8*_5M, 12*_5M, 16*_5M};


/*===============================================================
**
**      Prepare io register values used by ncr_init() according 
**      to selected and supported features.
**
**      NCR chips allow burst lengths of 2, 4, 8, 16, 32, 64, 128 
**      transfers. 32,64,128 are only supported by 875 and 895 chips.
**      We use log base 2 (burst length) as internal code, with 
**      value 0 meaning "burst disabled".
**
**===============================================================
*/

/*
 *      Burst length from burst code.
 */
#define burst_length(bc) (!(bc))? 0 : 1 << (bc)

/*
 *      Burst code from io register bits.
 */
#define burst_code(dmode, ctest4, ctest5) \
        (ctest4) & 0x80? 0 : (((dmode) & 0xc0) >> 6) + ((ctest5) & 0x04) + 1

/*
 *      Set initial io register bits from burst code.
 */
static inline void ncr_init_burst(ncb_p np, u_char bc)
{
        np->rv_ctest4   &= ~0x80;
        np->rv_dmode    &= ~(0x3 << 6);
        np->rv_ctest5   &= ~0x4;

        if (!bc) {
                np->rv_ctest4   |= 0x80;
        }
        else {
                --bc;
                np->rv_dmode    |= ((bc & 0x3) << 6);
                np->rv_ctest5   |= (bc & 0x4);
        }
}

#ifdef SCSI_NCR_NVRAM_SUPPORT

/*
**      Get target set-up from Symbios format NVRAM.
*/

static void __init 
ncr_Symbios_setup_target(ncb_p np, int target, Symbios_nvram *nvram)
{
        tcb_p tp = &np->target[target];
        Symbios_target *tn = &nvram->target[target];

        tp->usrsync = tn->sync_period ? (tn->sync_period + 3) / 4 : 255;
        tp->usrwide = tn->bus_width == 0x10 ? 1 : 0;
        tp->usrtags =
                (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? SCSI_NCR_MAX_TAGS : 0;

        if (!(tn->flags & SYMBIOS_DISCONNECT_ENABLE))
                tp->usrflag |= UF_NODISC;
        if (!(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME))
                tp->usrflag |= UF_NOSCAN;
}

/*
**      Get target set-up from Tekram format NVRAM.
*/

static void __init 
ncr_Tekram_setup_target(ncb_p np, int target, Tekram_nvram *nvram)
{
        tcb_p tp = &np->target[target];
        struct Tekram_target *tn = &nvram->target[target];
        int i;

        if (tn->flags & TEKRAM_SYNC_NEGO) {
                i = tn->sync_index & 0xf;
                tp->usrsync = i < 12 ? Tekram_sync[i] : 255;
        }

        tp->usrwide = (tn->flags & TEKRAM_WIDE_NEGO) ? 1 : 0;

        if (tn->flags & TEKRAM_TAGGED_COMMANDS) {
                tp->usrtags = 2 << nvram->max_tags_index;
        }

        if (!(tn->flags & TEKRAM_DISCONNECT_ENABLE))
                tp->usrflag = UF_NODISC;
 
        /* If any device does not support parity, we will not use this option */
        if (!(tn->flags & TEKRAM_PARITY_CHECK))
                np->rv_scntl0  &= ~0x0a; /* SCSI parity checking disabled */
}
#endif /* SCSI_NCR_NVRAM_SUPPORT */

static int __init ncr_prepare_setting(ncb_p np, ncr_nvram *nvram)
{
        u_char  burst_max;
        u_long  period;
        int i;

        /*
        **      Save assumed BIOS setting
        */

        np->sv_scntl0   = INB(nc_scntl0) & 0x0a;
        np->sv_scntl3   = INB(nc_scntl3) & 0x07;
        np->sv_dmode    = INB(nc_dmode)  & 0xce;
        np->sv_dcntl    = INB(nc_dcntl)  & 0xa8;
        np->sv_ctest3   = INB(nc_ctest3) & 0x01;
        np->sv_ctest4   = INB(nc_ctest4) & 0x80;
        np->sv_ctest5   = INB(nc_ctest5) & 0x24;
        np->sv_gpcntl   = INB(nc_gpcntl);
        np->sv_stest2   = INB(nc_stest2) & 0x20;
        np->sv_stest4   = INB(nc_stest4);

        /*
        **      Wide ?
        */

        np->maxwide     = (np->features & FE_WIDE)? 1 : 0;

        /*
        **      Get the frequency of the chip's clock.
        **      Find the right value for scntl3.
        */

        if      (np->features & FE_QUAD)
                np->multiplier  = 4;
        else if (np->features & FE_DBLR)
                np->multiplier  = 2;
        else
                np->multiplier  = 1;

        np->clock_khz   = (np->features & FE_CLK80)? 80000 : 40000;
        np->clock_khz   *= np->multiplier;

        if (np->clock_khz != 40000)
                ncr_getclock(np, np->multiplier);

        /*
         * Divisor to be used for async (timer pre-scaler).
         */
        i = np->clock_divn - 1;
        while (--i >= 0) {
                if (10ul * SCSI_NCR_MIN_ASYNC * np->clock_khz > div_10M[i]) {
                        ++i;
                        break;
                }
        }
        np->rv_scntl3 = i+1;

        /*
         * Minimum synchronous period factor supported by the chip.
         * Btw, 'period' is in tenths of nanoseconds.
         */

        period = (4 * div_10M[0] + np->clock_khz - 1) / np->clock_khz;
        if      (period <= 250)         np->minsync = 10;
        else if (period <= 303)         np->minsync = 11;
        else if (period <= 500)         np->minsync = 12;
        else                            np->minsync = (period + 40 - 1) / 40;

        /*
         * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
         */

        if      (np->minsync < 25 && !(np->features & (FE_ULTRA|FE_ULTRA2)))
                np->minsync = 25;
        else if (np->minsync < 12 && !(np->features & FE_ULTRA2))
                np->minsync = 12;

        /*
         * Maximum synchronous period factor supported by the chip.
         */

        period = (11 * div_10M[np->clock_divn - 1]) / (4 * np->clock_khz);
        np->maxsync = period > 2540 ? 254 : period / 10;

        /*
        **      Prepare initial value of other IO registers
        */
#if defined SCSI_NCR_TRUST_BIOS_SETTING
        np->rv_scntl0   = np->sv_scntl0;
        np->rv_dmode    = np->sv_dmode;
        np->rv_dcntl    = np->sv_dcntl;
        np->rv_ctest3   = np->sv_ctest3;
        np->rv_ctest4   = np->sv_ctest4;
        np->rv_ctest5   = np->sv_ctest5;
        burst_max       = burst_code(np->sv_dmode, np->sv_ctest4, np->sv_ctest5);
#else

        /*
        **      Select burst length (dwords)
        */
        burst_max       = driver_setup.burst_max;
        if (burst_max == 255)
                burst_max = burst_code(np->sv_dmode, np->sv_ctest4, np->sv_ctest5);
        if (burst_max > 7)
                burst_max = 7;
        if (burst_max > np->maxburst)
                burst_max = np->maxburst;

        /*
        **      Select all supported special features
        */
        if (np->features & FE_ERL)
                np->rv_dmode    |= ERL;         /* Enable Read Line */
        if (np->features & FE_BOF)
                np->rv_dmode    |= BOF;         /* Burst Opcode Fetch */
        if (np->features & FE_ERMP)
                np->rv_dmode    |= ERMP;        /* Enable Read Multiple */
        if (np->features & FE_PFEN)
                np->rv_dcntl    |= PFEN;        /* Prefetch Enable */
        if (np->features & FE_CLSE)
                np->rv_dcntl    |= CLSE;        /* Cache Line Size Enable */
        if (np->features & FE_WRIE)
                np->rv_ctest3   |= WRIE;        /* Write and Invalidate */
        if (np->features & FE_DFS)
                np->rv_ctest5   |= DFS;         /* Dma Fifo Size */

        /*
        **      Select some other
        */
        if (driver_setup.master_parity)
                np->rv_ctest4   |= MPEE;        /* Master parity checking */
        if (driver_setup.scsi_parity)
                np->rv_scntl0   |= 0x0a;        /*  full arb., ena parity, par->ATN  */

#ifdef SCSI_NCR_NVRAM_SUPPORT
        /*
        **      Get parity checking, host ID and verbose mode from NVRAM
        **/
        if (nvram) {
                switch(nvram->type) {
                case SCSI_NCR_TEKRAM_NVRAM:
                        np->myaddr = nvram->data.Tekram.host_id & 0x0f;
                        break;
                case SCSI_NCR_SYMBIOS_NVRAM:
                        if (!(nvram->data.Symbios.flags & SYMBIOS_PARITY_ENABLE))
                                np->rv_scntl0  &= ~0x0a;
                        np->myaddr = nvram->data.Symbios.host_id & 0x0f;
                        if (nvram->data.Symbios.flags & SYMBIOS_VERBOSE_MSGS)
                                np->verbose += 1;
                        break;
                }
        }
#endif
        /*
        **  Get SCSI addr of host adapter (set by bios?).
        */
        if (!np->myaddr) np->myaddr = INB(nc_scid) & 0x07;
        if (!np->myaddr) np->myaddr = SCSI_NCR_MYADDR;


#endif /* SCSI_NCR_TRUST_BIOS_SETTING */

        /*
         *      Prepare initial io register bits for burst length
         */
        ncr_init_burst(np, burst_max);

        /*
        **      Set differential mode and LED support.
        **      Ignore these features for boards known to use a 
        **      specific GPIO wiring (Tekram only for now).
        **      Probe initial setting of GPREG and GPCNTL for 
        **      other ones.
        */
        if (!nvram || nvram->type != SCSI_NCR_TEKRAM_NVRAM) {
                switch(driver_setup.diff_support) {
                case 3:
                        if (INB(nc_gpreg) & 0x08)
                        break;
                case 2:
                        np->rv_stest2   |= 0x20;
                        break;
                case 1:
                        np->rv_stest2   |= (np->sv_stest2 & 0x20);
                        break;
                default:
                        break;
                }
        }
        if ((driver_setup.led_pin ||
             (nvram && nvram->type == SCSI_NCR_SYMBIOS_NVRAM)) &&
            !(np->sv_gpcntl & 0x01))
                np->features |= FE_LED0;

        /*
        **      Set irq mode.
        */
        switch(driver_setup.irqm & 3) {
        case 2:
                np->rv_dcntl    |= IRQM;
                break;
        case 1:
                np->rv_dcntl    |= (np->sv_dcntl & IRQM);
                break;
        default:
                break;
        }

        /*
        **      Configure targets according to driver setup.
        **      If NVRAM present get targets setup from NVRAM.
        **      Allow to override sync, wide and NOSCAN from 
        **      boot command line.
        */
        for (i = 0 ; i < MAX_TARGET ; i++) {
                tcb_p tp = &np->target[i];

                tp->usrsync = 255;
#ifdef SCSI_NCR_NVRAM_SUPPORT
                if (nvram) {
                        switch(nvram->type) {
                        case SCSI_NCR_TEKRAM_NVRAM:
                                ncr_Tekram_setup_target(np, i, &nvram->data.Tekram);
                                break;
                        case SCSI_NCR_SYMBIOS_NVRAM:
                                ncr_Symbios_setup_target(np, i, &nvram->data.Symbios);
                                break;
                        }
                        if (driver_setup.use_nvram & 0x2)
                                tp->usrsync = driver_setup.default_sync;
                        if (driver_setup.use_nvram & 0x4)
                                tp->usrwide = driver_setup.max_wide;
                        if (driver_setup.use_nvram & 0x8)
                                tp->usrflag &= ~UF_NOSCAN;
                }
                else {
#else
                if (1) {
#endif
                        tp->usrsync = driver_setup.default_sync;
                        tp->usrwide = driver_setup.max_wide;
                        tp->usrtags = SCSI_NCR_MAX_TAGS;
                        if (!driver_setup.disconnection)
                                np->target[i].usrflag = UF_NODISC;
                }
        }

        /*
        **      Announce all that stuff to user.
        */

        i = nvram ? nvram->type : 0;
        printk(KERN_INFO "%s: %sID %d, Fast-%d%s%s\n", ncr_name(np),
                i  == SCSI_NCR_SYMBIOS_NVRAM ? "Symbios format NVRAM, " :
                (i == SCSI_NCR_TEKRAM_NVRAM  ? "Tekram format NVRAM, " : ""),
                np->myaddr,
                np->minsync < 12 ? 40 : (np->minsync < 25 ? 20 : 10),
                (np->rv_scntl0 & 0xa)   ? ", Parity Checking"   : ", NO Parity",
                (np->rv_stest2 & 0x20)  ? ", Differential"      : "");

        if (bootverbose > 1) {
                printk (KERN_INFO "%s: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
                        "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
                        ncr_name(np), np->sv_scntl3, np->sv_dmode, np->sv_dcntl,
                        np->sv_ctest3, np->sv_ctest4, np->sv_ctest5);

                printk (KERN_INFO "%s: final   SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
                        "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
                        ncr_name(np), np->rv_scntl3, np->rv_dmode, np->rv_dcntl,
                        np->rv_ctest3, np->rv_ctest4, np->rv_ctest5);
        }

        if (bootverbose && np->paddr2)
                printk (KERN_INFO "%s: on-chip RAM at 0x%lx\n",
                        ncr_name(np), np->paddr2);

        return 0;
}


#ifdef SCSI_NCR_DEBUG_NVRAM

void __init ncr_display_Symbios_nvram(ncb_p np, Symbios_nvram *nvram)
{
        int i;

        /* display Symbios nvram host data */
        printk(KERN_DEBUG "%s: HOST ID=%d%s%s%s%s%s\n",
                ncr_name(np), nvram->host_id & 0x0f,
                (nvram->flags  & SYMBIOS_SCAM_ENABLE)   ? " SCAM"       :"",
                (nvram->flags  & SYMBIOS_PARITY_ENABLE) ? " PARITY"     :"",
                (nvram->flags  & SYMBIOS_VERBOSE_MSGS)  ? " VERBOSE"    :"", 
                (nvram->flags  & SYMBIOS_CHS_MAPPING)   ? " CHS_ALT"    :"", 
                (nvram->flags1 & SYMBIOS_SCAN_HI_LO)    ? " HI_LO"      :"");

        /* display Symbios nvram drive data */
        for (i = 0 ; i < 15 ; i++) {
                struct Symbios_target *tn = &nvram->target[i];
                printk(KERN_DEBUG "%s-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
                ncr_name(np), i,
                (tn->flags & SYMBIOS_DISCONNECT_ENABLE) ? " DISC"       : "",
                (tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME) ? " SCAN_BOOT"  : "",
                (tn->flags & SYMBIOS_SCAN_LUNS)         ? " SCAN_LUNS"  : "",
                (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ"        : "",
                tn->bus_width,
                tn->sync_period / 4,
                tn->timeout);
        }
}

static u_char Tekram_boot_delay[7] __initdata = {3, 5, 10, 20, 30, 60, 120};

void __init ncr_display_Tekram_nvram(ncb_p np, Tekram_nvram *nvram)
{
        int i, tags, boot_delay;
        char *rem;

        /* display Tekram nvram host data */
        tags = 2 << nvram->max_tags_index;
        boot_delay = 0;
        if (nvram->boot_delay_index < 6)
                boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
        switch((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
        default:
        case 0: rem = "";                       break;
        case 1: rem = " REMOVABLE=boot device"; break;
        case 2: rem = " REMOVABLE=all";         break;
        }

        printk(KERN_DEBUG
                "%s: HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
                ncr_name(np), nvram->host_id & 0x0f,
                (nvram->flags1 & SYMBIOS_SCAM_ENABLE)   ? " SCAM"       :"",
                (nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES"        :"",
                (nvram->flags & TEKRAM_DRIVES_SUP_1GB)  ? " >1GB"       :"",
                (nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET"    :"",
                (nvram->flags & TEKRAM_ACTIVE_NEGATION) ? " ACT_NEG"    :"",
                (nvram->flags & TEKRAM_IMMEDIATE_SEEK)  ? " IMM_SEEK"   :"",
                (nvram->flags & TEKRAM_SCAN_LUNS)       ? " SCAN_LUNS"  :"",
                (nvram->flags1 & TEKRAM_F2_F6_ENABLED)  ? " F2_F6"      :"",
                rem, boot_delay, tags);

        /* display Tekram nvram drive data */
        for (i = 0; i <= 15; i++) {
                int sync, j;
                struct Tekram_target *tn = &nvram->target[i];
                j = tn->sync_index & 0xf;
                sync = j < 12 ? Tekram_sync[j] : 255;
                printk(KERN_DEBUG "%s-%d:%s%s%s%s%s%s PERIOD=%d\n",
                ncr_name(np), i,
                (tn->flags & TEKRAM_PARITY_CHECK)       ? " PARITY"     : "",
                (tn->flags & TEKRAM_SYNC_NEGO)          ? " SYNC"       : "",
                (tn->flags & TEKRAM_DISCONNECT_ENABLE)  ? " DISC"       : "",
                (tn->flags & TEKRAM_START_CMD)          ? " START"      : "",
                (tn->flags & TEKRAM_TAGGED_COMMANDS)    ? " TCQ"        : "",
                (tn->flags & TEKRAM_WIDE_NEGO)          ? " WIDE"       : "",
                sync);
        }
}
#endif /* SCSI_NCR_DEBUG_NVRAM */

/*
**      Host attach and initialisations.
**
**      Allocate host data and ncb structure.
**      Request IO region and remap MMIO region.
**      Do chip initialization.
**      If all is OK, install interrupt handling and
**      start the timer daemon.
*/

static int __init 
ncr_attach (Scsi_Host_Template *tpnt, int unit, ncr_device *device)
{
        struct host_data *host_data;
        ncb_p np;
        struct Scsi_Host *instance = 0;
        u_long flags = 0;
        ncr_nvram *nvram = device->nvram;
        int i;

#ifdef __sparc__
printk(KERN_INFO "ncr53c%s-%d: rev=0x%02x, base=0x%lx, io_port=0x%lx, irq=%s\n",
        device->chip.name, unit, device->chip.revision_id, device->slot.base,
        device->slot.io_port, __irq_itoa(device->slot.irq));
#else
printk(KERN_INFO "ncr53c%s-%d: rev=0x%02x, base=0x%lx, io_port=0x%lx, irq=%d\n",
        device->chip.name, unit, device->chip.revision_id, device->slot.base,
        device->slot.io_port, device->slot.irq);
#endif
 
        /*
        **      Allocate host_data structure
        */
        if (!(instance = scsi_register(tpnt, sizeof(*host_data))))
                goto attach_error;

        /*
        **      Initialize structure.
        */
        host_data = (struct host_data *) instance->hostdata;
        bzero (host_data, sizeof(*host_data));

        /*
        **      Align np and first ccb to 32 boundary for cache line 
        **      bursting when copying the global header.
        */
        np = (ncb_p) (((u_long) &host_data->_ncb_data) & CACHE_LINE_MASK);
        NCR_INIT_LOCK_NCB(np);
        host_data->ncb = np;
        np->ccb = (ccb_p) (((u_long) &host_data->_ccb_data) & CACHE_LINE_MASK);

        /*
        **      Store input informations in the host data structure.
        */
        strncpy(np->chip_name, device->chip.name, sizeof(np->chip_name) - 1);
        np->unit        = unit;
        np->verbose     = driver_setup.verbose;
        sprintf(np->inst_name, "ncr53c%s-%d", np->chip_name, np->unit);
        np->device_id   = device->chip.device_id;
        np->revision_id = device->chip.revision_id;
        np->features    = device->chip.features;
        np->clock_divn  = device->chip.nr_divisor;
        np->maxoffs     = device->chip.offset_max;
        np->maxburst    = device->chip.burst_max;

        np->script0  = (struct script *)
                (((u_long) &host_data->script_data) & CACHE_LINE_MASK);
        np->scripth0 = &host_data->scripth_data;

        /*
        **    Initialize timer structure
        **
        */
        init_timer(&np->timer);
        np->timer.data     = (unsigned long) np;
        np->timer.function = ncr53c8xx_timeout;

        /*
        **      Try to map the controller chip to
        **      virtual and physical memory.
        */

        np->paddr       = device->slot.base;
        np->paddr2      = (np->features & FE_RAM)? device->slot.base_2 : 0;

#ifndef NCR_IOMAPPED
        np->vaddr = remap_pci_mem((u_long) np->paddr, (u_long) 128);
        if (!np->vaddr) {
                printk(KERN_ERR
                        "%s: can't map memory mapped IO region\n",ncr_name(np));
                goto attach_error;
        }
        else
                if (bootverbose > 1)
                        printk(KERN_INFO
                                "%s: using memory mapped IO at virtual address 0x%lx\n", ncr_name(np), (u_long) np->vaddr);

        /*
        **      Make the controller's registers available.
        **      Now the INB INW INL OUTB OUTW OUTL macros
        **      can be used safely.
        */

        np->reg = (struct ncr_reg*) np->vaddr;

#endif /* !defined NCR_IOMAPPED */

        /*
        **      Try to map the controller chip into iospace.
        */

        request_region(device->slot.io_port, 128, "ncr53c8xx");
        np->port = device->slot.io_port;

#ifdef SCSI_NCR_NVRAM_SUPPORT
        if (nvram) {
                switch(nvram->type) {
                case SCSI_NCR_SYMBIOS_NVRAM:
#ifdef SCSI_NCR_DEBUG_NVRAM
                        ncr_display_Symbios_nvram(np, &nvram->data.Symbios);
#endif
                        break;
                case SCSI_NCR_TEKRAM_NVRAM:
#ifdef SCSI_NCR_DEBUG_NVRAM
                        ncr_display_Tekram_nvram(np, &nvram->data.Tekram);
#endif
                        break;
                default:
                        nvram = 0;
#ifdef SCSI_NCR_DEBUG_NVRAM
                        printk(KERN_DEBUG "%s: NVRAM: None or invalid data.\n", ncr_name(np));
#endif
                }
        }
#endif

        /*
        **      Do chip dependent initialization.
        */
        (void)ncr_prepare_setting(np, nvram);

        if (np->paddr2 && sizeof(struct script) > 4096) {
                np->paddr2 = 0;
                printk(KERN_WARNING "%s: script too large, NOT using on chip RAM.\n",
                        ncr_name(np));
        }

        /*
        **      Fill Linux host instance structure
        */
        instance->max_channel   = 0;
        instance->max_id        = np->maxwide ? 16 : 8;
        instance->max_lun       = SCSI_NCR_MAX_LUN;
#ifndef NCR_IOMAPPED
        instance->base          = (char *) np->reg;
#endif
        instance->irq           = device->slot.irq;
        instance->unique_id     = device->slot.io_port;
        instance->io_port       = device->slot.io_port;
        instance->n_io_port     = 128;
        instance->dma_channel   = 0;
        instance->select_queue_depths = ncr53c8xx_select_queue_depths;

        /*
        **      Patch script to physical addresses
        */
        ncr_script_fill (&script0, &scripth0);

        np->scripth     = np->scripth0;
        np->p_scripth   = vtophys(np->scripth);

        np->p_script    = (np->paddr2) ? bus_dvma_to_mem(np->paddr2) : vtophys(np->script0);

        ncr_script_copy_and_bind (np, (ncrcmd *) &script0, (ncrcmd *) np->script0, sizeof(struct script));
        ncr_script_copy_and_bind (np, (ncrcmd *) &scripth0, (ncrcmd *) np->scripth0, sizeof(struct scripth));
        np->ccb->p_ccb          = vtophys (np->ccb);

        /*
        **    Patch the script for LED support.
        */

        if (np->features & FE_LED0) {
                np->script0->idle[0]  =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_OR,  0x01));
                np->script0->reselected[0] =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
                np->script0->start[0] =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
        }

        /*
        **      Look for the target control block of this nexus.
        **      For i = 0 to 3
        **              JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
        */
        for (i = 0 ; i < 4 ; i++) {
                np->jump_tcb[i].l_cmd   =
                                cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
                np->jump_tcb[i].l_paddr =
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_target));
        }

        /*
        **      Reset chip.
        */

        OUTB (nc_istat,  SRST);
        UDELAY (100);
        OUTB (nc_istat,  0   );

        /*
        **      Now check the cache handling of the pci chipset.
        */

        if (ncr_snooptest (np)) {
                printk (KERN_ERR "CACHE INCORRECTLY CONFIGURED.\n");
                goto attach_error;
        };

        /*
        **      Install the interrupt handler.
        */

        if (request_irq(device->slot.irq, ncr53c8xx_intr,
                        ((driver_setup.irqm & 0x10) ? 0 : SA_SHIRQ) |
#if LINUX_VERSION_CODE < LinuxVersionCode(2,2,0)
                        ((driver_setup.irqm & 0x20) ? 0 : SA_INTERRUPT),
#else
                        0,
#endif
                        "ncr53c8xx", np)) {
#ifdef __sparc__
                printk(KERN_ERR "%s: request irq %s failure\n",
                        ncr_name(np), __irq_itoa(device->slot.irq));
#else
                printk(KERN_ERR "%s: request irq %d failure\n",
                        ncr_name(np), device->slot.irq);
#endif
                goto attach_error;
        }

        np->irq = device->slot.irq;

        /*
        **      Initialize the fixed part of the default ccb.
        */
        ncr_init_ccb(np, np->ccb);

        /*
        **      After SCSI devices have been opened, we cannot
        **      reset the bus safely, so we do it here.
        **      Interrupt handler does the real work.
        **      Process the reset exception,
        **      if interrupts are not enabled yet.
        **      Then enable disconnects.
        */
        NCR_LOCK_NCB(np, flags);
        if (ncr_reset_scsi_bus(np, 0, driver_setup.settle_delay) != 0) {
                printk(KERN_ERR "%s: FATAL ERROR: CHECK SCSI BUS - CABLES, TERMINATION, DEVICE POWER etc.!\n", ncr_name(np));

                NCR_UNLOCK_NCB(np, flags);
                goto attach_error;
        }
        ncr_exception (np);

        np->disc = 1;

        /*
        **      The middle-level SCSI driver does not
        **      wait for devices to settle.
        **      Wait synchronously if more than 2 seconds.
        */
        if (driver_setup.settle_delay > 2) {
                printk(KERN_INFO "%s: waiting %d seconds for scsi devices to settle...\n",
                        ncr_name(np), driver_setup.settle_delay);
                MDELAY (1000 * driver_setup.settle_delay);
        }

        /*
        **      Now let the generic SCSI driver
        **      look for the SCSI devices on the bus ..
        */

        /*
        **      start the timeout daemon
        */
        np->lasttime=0;
        ncr_timeout (np);

        /*
        **  use SIMPLE TAG messages by default
        */
#ifdef SCSI_NCR_ALWAYS_SIMPLE_TAG
        np->order = M_SIMPLE_TAG;
#endif

        /*
        **  Done.
        */
        if (!the_template) {
                the_template = instance->hostt;
                first_host = instance;
        }

        NCR_UNLOCK_NCB(np, flags);

        return 0;

attach_error:
        if (!instance) return -1;
        printk(KERN_INFO "%s: detaching...\n", ncr_name(np));
#ifndef NCR_IOMAPPED
        if (np->vaddr) {
#ifdef DEBUG_NCR53C8XX
                printk(KERN_DEBUG "%s: releasing memory mapped IO region %lx[%d]\n", ncr_name(np), (u_long) np->vaddr, 128);
#endif
                unmap_pci_mem((vm_offset_t) np->vaddr, (u_long) 128);
        }
#endif /* !NCR_IOMAPPED */
        if (np->port) {
#ifdef DEBUG_NCR53C8XX
                printk(KERN_DEBUG "%s: releasing IO region %x[%d]\n", ncr_name(np), np->port, 128);
#endif
                release_region(np->port, 128);
        }
        if (np->irq) {
#ifdef DEBUG_NCR53C8XX
#ifdef __sparc__
        printk(KERN_INFO "%s: freeing irq %s\n", ncr_name(np),
               __irq_itoa(np->irq));
#else
        printk(KERN_INFO "%s: freeing irq %d\n", ncr_name(np), np->irq);
#endif
#endif
                free_irq(np->irq, np);
        }
        scsi_unregister(instance);

        return -1;
 }


/*==========================================================
**
**
**      Done SCSI commands list management.
**
**      We donnot enter the scsi_done() callback immediately 
**      after a command has been seen as completed but we 
**      insert it into a list which is flushed outside any kind 
**      of driver critical section.
**      This allows to do minimal stuff under interrupt and 
**      inside critical sections and to also avoid locking up 
**      on recursive calls to driver entry points under SMP.
**      In fact, the only kernel point which is entered by the 
**      driver with a driver lock set is kmalloc(GFP_ATOMIC) 
**      that shall not reenter the driver under any circumstances,
**      AFAIK.
**
**==========================================================
*/
static inline void ncr_queue_done_cmd(ncb_p np, Scsi_Cmnd *cmd)
{
        cmd->host_scribble = (char *) np->done_list;
        np->done_list = cmd;
}

static inline void ncr_flush_done_cmds(Scsi_Cmnd *lcmd)
{
        Scsi_Cmnd *cmd;

        while (lcmd) {
                cmd = lcmd;
                lcmd = (Scsi_Cmnd *) cmd->host_scribble;
                cmd->scsi_done(cmd);
        }
}


/*==========================================================
**
**
**      Start execution of a SCSI command.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_queue_command (ncb_p np, Scsi_Cmnd *cmd)
{
/*      Scsi_Device        *device    = cmd->device; */
        tcb_p tp                      = &np->target[cmd->target];
        lcb_p lp                      = tp->lp[cmd->lun];
        ccb_p cp;

        int     segments;
        u_char  nego, idmsg, *msgptr;
        u_int  msglen;
        int     direction;
        u_int32 lastp, goalp;

        /*---------------------------------------------
        **
        **      Some shortcuts ...
        **
        **---------------------------------------------
        */
        if ((cmd->target == np->myaddr    ) ||
                (cmd->target >= MAX_TARGET) ||
                (cmd->lun    >= MAX_LUN   )) {
                return(DID_BAD_TARGET);
        }

        /*---------------------------------------------
        **
        **      Complete the 1st TEST UNIT READY command
        **      with error condition if the device is 
        **      flagged NOSCAN, in order to speed up 
        **      the boot.
        **
        **---------------------------------------------
        */
        if (cmd->cmnd[0] == 0 && (tp->usrflag & UF_NOSCAN)) {
                tp->usrflag &= ~UF_NOSCAN;
                return DID_BAD_TARGET;
        }

        if (DEBUG_FLAGS & DEBUG_TINY) {
                PRINT_ADDR(cmd);
                printk ("CMD=%x ", cmd->cmnd[0]);
        }

        /*---------------------------------------------------
        **
        **      Assign a ccb / bind cmd.
        **      If resetting, shorten settle_time if necessary
        **      in order to avoid spurious timeouts.
        **      If resetting or no free ccb,
        **      insert cmd into the waiting list.
        **
        **----------------------------------------------------
        */
        if (np->settle_time && cmd->timeout_per_command >= HZ &&
                np->settle_time > jiffies + cmd->timeout_per_command - HZ) {
                np->settle_time = jiffies + cmd->timeout_per_command - HZ;
        }

        if (np->settle_time || !(cp=ncr_get_ccb (np, cmd->target, cmd->lun))) {
                insert_into_waiting_list(np, cmd);
                return(DID_OK);
        }
        cp->cmd = cmd;

        /*---------------------------------------------------
        **
        **      Enable tagged queue if asked by scsi ioctl
        **
        **----------------------------------------------------
        */
#if 0   /* This stuff was only usefull for linux-1.2.13 */
        if (lp && !lp->numtags && cmd->device && cmd->device->tagged_queue) {
                lp->numtags = tp->usrtags;
                ncr_setup_tags (np, cmd->target, cmd->lun);
        }
#endif

        /*---------------------------------------------------
        **
        **      timestamp
        **
        **----------------------------------------------------
        */
#ifdef SCSI_NCR_PROFILE_SUPPORT
        bzero (&cp->phys.header.stamp, sizeof (struct tstamp));
        cp->phys.header.stamp.start = jiffies;
#endif

        /*---------------------------------------------------
        **
        **      negotiation required?
        **
        **---------------------------------------------------
        */

        nego = 0;

        if ((!tp->widedone || !tp->period) && !tp->nego_cp && tp->inq_done && lp) {

                /*
                **      negotiate wide transfers ?
                */

                if (!tp->widedone) {
                        if (tp->inq_byte7 & INQ7_WIDE16) {
                                nego = NS_WIDE;
                        } else
                                tp->widedone=1;
                };

                /*
                **      negotiate synchronous transfers?
                */

                if (!nego && !tp->period) {
                        if (tp->inq_byte7 & INQ7_SYNC) {
                                nego = NS_SYNC;
                        } else {
                                tp->period  =0xffff;
                                PRINT_TARGET(np, cmd->target);
                                printk ("device did not report SYNC.\n");
                        };
                };

                /*
                **      remember nego is pending for the target.
                **      Avoid to start a nego for all queued commands 
                **      when tagged command queuing is enabled.
                */

                if (nego)
                        tp->nego_cp = cp;
        };

        /*----------------------------------------------------
        **
        **      Build the identify / tag / sdtr message
        **
        **----------------------------------------------------
        */

        idmsg = M_IDENTIFY | cmd->lun;

        if (cp ->tag != NO_TAG ||
                (cp != np->ccb && np->disc && !(tp->usrflag & UF_NODISC)))
                idmsg |= 0x40;

        msgptr = cp->scsi_smsg;
        msglen = 0;
        msgptr[msglen++] = idmsg;

        if (cp->tag != NO_TAG) {
                char order = np->order;

                /*
                **      Force ordered tag if necessary to avoid timeouts 
                **      and to preserve interactivity.
                */
                if (lp && lp->tags_stime + (3*HZ) <= jiffies) {
                        if (lp->tags_smap) {
                                order = M_ORDERED_TAG;
                                if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){ 
                                        PRINT_ADDR(cmd);
                                        printk("ordered tag forced.\n");
                                }
                        }
                        lp->tags_stime = jiffies;
                        lp->tags_smap = lp->tags_umap;
                }

                if (order == 0) {
                        /*
                        **      Ordered write ops, unordered read ops.
                        */
                        switch (cmd->cmnd[0]) {
                        case 0x08:  /* READ_SMALL (6) */
                        case 0x28:  /* READ_BIG  (10) */
                        case 0xa8:  /* READ_HUGE (12) */
                                order = M_SIMPLE_TAG;
                                break;
                        default:
                                order = M_ORDERED_TAG;
                        }
                }
                msgptr[msglen++] = order;
                /*
                **      Actual tags are numbered 1,3,5,..2*MAXTAGS+1,
                **      since we may have to deal with devices that have 
                **      problems with #TAG 0 or too great #TAG numbers.
                */
                msgptr[msglen++] = (cp->tag << 1) + 1;
        }

        switch (nego) {
        case NS_SYNC:
                msgptr[msglen++] = M_EXTENDED;
                msgptr[msglen++] = 3;
                msgptr[msglen++] = M_X_SYNC_REQ;
                msgptr[msglen++] = tp->maxoffs ? tp->minsync : 0;
                msgptr[msglen++] = tp->maxoffs;
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("sync msgout: ");
                        ncr_show_msg (&cp->scsi_smsg [msglen-5]);
                        printk (".\n");
                };
                break;
        case NS_WIDE:
                msgptr[msglen++] = M_EXTENDED;
                msgptr[msglen++] = 2;
                msgptr[msglen++] = M_X_WIDE_REQ;
                msgptr[msglen++] = tp->usrwide;
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("wide msgout: ");
                        ncr_show_msg (&cp->scsi_smsg [msglen-4]);
                        printk (".\n");
                };
                break;
        };

        /*----------------------------------------------------
        **
        **      Build the data descriptors
        **
        **----------------------------------------------------
        */

        segments = ncr_scatter (cp, cp->cmd);

        if (segments < 0) {
                ncr_free_ccb(np, cp);
                return(DID_ERROR);
        }

        /*----------------------------------------------------
        **
        **      Guess xfer direction.
        **      Spare some CPU by testing here frequently opcode.
        **
        **----------------------------------------------------
        */
        if (!cp->data_len)
                direction = 0;
        else {
                switch((int) cmd->cmnd[0]) {
                case 0x08:  /*  READ(6)                         08 */
                case 0x28:  /*  READ(10)                        28 */
                case 0xA8:  /*  READ(12)                        A8 */
                        direction = XFER_IN;
                        break;
                case 0x0A:  /*  WRITE(6)                        0A */
                case 0x2A:  /*  WRITE(10)                       2A */
                case 0xAA:  /*  WRITE(12)                       AA */
                        direction = XFER_OUT;
                        break;
                default:
                        direction = (XFER_IN|XFER_OUT);
                        break;
                }
        }

        /*----------------------------------------------------
        **
        **      Set the SAVED_POINTER.
        **
        **----------------------------------------------------
        */

        /*
        **      Default to no data transfer.
        */
        lastp = goalp = NCB_SCRIPT_PHYS (np, no_data);

        /*
        **      Compute data out pointers, if needed.
        */
        if (direction & XFER_OUT) {
                goalp = NCB_SCRIPT_PHYS (np, data_out2) + 8;
                if (segments <= MAX_SCATTERL)
                        lastp = goalp - 8 - (segments * 16);
                else {
                        lastp = NCB_SCRIPTH_PHYS (np, hdata_out2);
                        lastp -= (segments - MAX_SCATTERL) * 16;
                }
                /*
                **      If actual data direction is unknown, save pointers 
                **      in header. The SCRIPTS will swap them to current 
                **      if target decision will be data out.
                */
                if (direction & XFER_IN) {
                        cp->phys.header.wgoalp  = cpu_to_scr(goalp);
                        cp->phys.header.wlastp  = cpu_to_scr(lastp);
                }
        }

        /*
        **      Compute data in pointers, if needed.
        */
        if (direction & XFER_IN) {
                goalp = NCB_SCRIPT_PHYS (np, data_in2) + 8;
                if (segments <= MAX_SCATTERL)
                        lastp = goalp - 8 - (segments * 16);
                else {
                        lastp = NCB_SCRIPTH_PHYS (np, hdata_in2);
                        lastp -= (segments - MAX_SCATTERL) * 16;
                }
        }

        /*
        **      Set all pointers values needed by SCRIPTS.
        **      If direction is unknown, start at data_io.
        */
        cp->phys.header.lastp = cpu_to_scr(lastp);
        cp->phys.header.goalp = cpu_to_scr(goalp);

        if ((direction & (XFER_IN|XFER_OUT)) == (XFER_IN|XFER_OUT))
                cp->phys.header.savep = 
                        cpu_to_scr(NCB_SCRIPTH_PHYS (np, data_io));
        else
                cp->phys.header.savep= cpu_to_scr(lastp);

        /*
        **      Save the initial data pointer in order to be able 
        **      to redo the command.
        */
        cp->startp = cp->phys.header.savep;

        /*----------------------------------------------------
        **
        **      fill in ccb
        **
        **----------------------------------------------------
        **
        **
        **      physical -> virtual backlink
        **      Generic SCSI command
        */

        /*
        **      Startqueue
        */
        cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
        cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_dsa));
        /*
        **      select
        */
        cp->phys.select.sel_id          = cmd->target;
        cp->phys.select.sel_scntl3      = tp->wval;
        cp->phys.select.sel_sxfer       = tp->sval;
        /*
        **      message
        */
        cp->phys.smsg.addr              = cpu_to_scr(CCB_PHYS (cp, scsi_smsg));
        cp->phys.smsg.size              = cpu_to_scr(msglen);

        /*
        **      command
        */
        cp->phys.cmd.addr               = cpu_to_scr(vtophys (&cmd->cmnd[0]));
        cp->phys.cmd.size               = cpu_to_scr(cmd->cmd_len);

        /*
        **      status
        */
        cp->actualquirks                = tp->quirks;
        cp->host_status                 = nego ? HS_NEGOTIATE : HS_BUSY;
        cp->scsi_status                 = S_ILLEGAL;
        cp->parity_status               = 0;

        cp->xerr_status                 = XE_OK;
        cp->nego_status                 = nego;
#if 0
        cp->sync_status                 = tp->sval;
        cp->wide_status                 = tp->wval;
#endif

        /*----------------------------------------------------
        **
        **      Critical region: start this job.
        **
        **----------------------------------------------------
        */

        /*
        **      activate this job.
        */

        /* Compute a time limit greater than the middle-level driver one */
        if (cmd->timeout_per_command > 0)
                cp->tlimit      = jiffies + cmd->timeout_per_command + HZ;
        else
                cp->tlimit      = jiffies + 86400 * HZ;/* No timeout=24 hours */
        cp->magic               = CCB_MAGIC;

        /*
        **      insert next CCBs into start queue.
        **      2 max at a time is enough to flush the CCB wait queue.
        */
        cp->auto_sense = 0;
        if (lp)
                ncr_start_next_ccb(np, lp, 2);
        else
                ncr_put_start_queue(np, cp);

        /*
        **      Command is successfully queued.
        */

        return(DID_OK);
}


/*==========================================================
**
**
**      Insert a CCB into the start queue and wake up the 
**      SCRIPTS processor.
**
**
**==========================================================
*/

static void ncr_start_next_ccb(ncb_p np, lcb_p lp, int maxn)
{
        XPT_QUEHEAD *qp;
        ccb_p cp;

        if (lp->held_ccb)
                return;

        while (maxn-- && lp->queuedccbs < lp->queuedepth) {
                qp = xpt_remque_head(&lp->wait_ccbq);
                if (!qp)
                        break;
                ++lp->queuedccbs;
                cp = xpt_que_entry(qp, struct ccb, link_ccbq);
                xpt_insque_tail(qp, &lp->busy_ccbq);
                lp->jump_ccb[cp->tag == NO_TAG ? 0 : cp->tag] =
                        cpu_to_scr(CCB_PHYS (cp, restart));
                ncr_put_start_queue(np, cp);
        }
}

static void ncr_put_start_queue(ncb_p np, ccb_p cp)
{
        u_short qidx;

        /*
        **      insert into start queue.
        */
        if (!np->squeueput) np->squeueput = 1;
        qidx = np->squeueput + 2;
        if (qidx >= MAX_START + MAX_START) qidx = 1;

        np->scripth->tryloop [qidx] = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        MEMORY_BARRIER();
        np->scripth->tryloop [np->squeueput] = cpu_to_scr(CCB_PHYS (cp, start));

        np->squeueput = qidx;
        ++np->queuedccbs;
        cp->queued = 1;

        if (DEBUG_FLAGS & DEBUG_QUEUE)
                printk ("%s: queuepos=%d.\n", ncr_name (np), np->squeueput);

        /*
        **      Script processor may be waiting for reselect.
        **      Wake it up.
        */
        MEMORY_BARRIER();
        OUTB (nc_istat, SIGP);
}


/*==========================================================
**
**
**      Start reset process.
**      If reset in progress do nothing.
**      The interrupt handler will reinitialize the chip.
**      The timeout handler will wait for settle_time before 
**      clearing it and so resuming command processing.
**
**
**==========================================================
*/
static void ncr_start_reset(ncb_p np)
{
        if (!np->settle_time) {
                (void) ncr_reset_scsi_bus(np, 1, driver_setup.settle_delay);
        }
 }
 
static int ncr_reset_scsi_bus(ncb_p np, int enab_int, int settle_delay)
{
        u_int32 term;
        int retv = 0;

        np->settle_time = jiffies + settle_delay * HZ;

        if (bootverbose > 1)
                printk("%s: resetting, "
                        "command processing suspended for %d seconds\n",
                        ncr_name(np), settle_delay);

        OUTB (nc_istat, SRST);
        UDELAY (100);
        OUTB (nc_istat, 0);
        UDELAY (2000);  /* The 895 needs time for the bus mode to settle */
        if (enab_int)
                OUTW (nc_sien, RST);
        /*
        **      Enable Tolerant, reset IRQD if present and 
        **      properly set IRQ mode, prior to resetting the bus.
        */
        OUTB (nc_stest3, TE);
        OUTB (nc_dcntl, (np->rv_dcntl & IRQM));
        OUTB (nc_scntl1, CRST);
        UDELAY (200);

        if (!driver_setup.bus_check)
                goto out;
        /*
        **      Check for no terminators or SCSI bus shorts to ground.
        **      Read SCSI data bus, data parity bits and control signals.
        **      We are expecting RESET to be TRUE and other signals to be 
        **      FALSE.
        */
        term =  INB(nc_sstat0);                         /* rst, sdp0 */
        term =  ((term & 2) << 7) + ((term & 1) << 16);
        term |= ((INB(nc_sstat2) & 0x01) << 25) |       /* sdp1 */
                (INW(nc_sbdl) << 9) |                   /* d15-0 */
                INB(nc_sbcl);   /* req, ack, bsy, sel, atn, msg, cd, io */

        if (!(np->features & FE_WIDE))
                term &= 0x3ffff;

        if (term != (2<<7)) {
                printk("%s: suspicious SCSI data while resetting the BUS.\n",
                        ncr_name(np));
                printk("%s: %sdp0,d7-0,rst,req,ack,bsy,sel,atn,msg,c/d,i/o = "
                        "0x%lx, expecting 0x%lx\n",
                        ncr_name(np),
                        (np->features & FE_WIDE) ? "dp1,d15-8," : "",
                        (u_long)term, (u_long)(2<<7));
                if (driver_setup.bus_check == 1)
                        retv = 1;
        }
out:
        OUTB (nc_scntl1, 0);
        return retv;
}

/*==========================================================
**
**
**      Reset the SCSI BUS.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_reset_bus (ncb_p np, Scsi_Cmnd *cmd, int sync_reset)
{
/*      Scsi_Device        *device    = cmd->device; */
        ccb_p cp;
        int found;

/*
 * Return immediately if reset is in progress.
 */
        if (np->settle_time) {
                return SCSI_RESET_PUNT;
        }
/*
 * Start the reset process.
 * The script processor is then assumed to be stopped.
 * Commands will now be queued in the waiting list until a settle 
 * delay of 2 seconds will be completed.
 */
        ncr_start_reset(np);
/*
 * First, look in the wakeup list
 */
        for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
                /*
                **      look for the ccb of this command.
                */
                if (cp->host_status == HS_IDLE) continue;
                if (cp->cmd == cmd) {
                        found = 1;
                        break;
                }
        }
/*
 * Then, look in the waiting list
 */
        if (!found && retrieve_from_waiting_list(0, np, cmd))
                found = 1;
/*
 * Wake-up all awaiting commands with DID_RESET.
 */
        reset_waiting_list(np);
/*
 * Wake-up all pending commands with HS_RESET -> DID_RESET.
 */
        ncr_wakeup(np, HS_RESET);
/*
 * If the involved command was not in a driver queue, and the 
 * scsi driver told us reset is synchronous, and the command is not 
 * currently in the waiting list, complete it with DID_RESET status,
 * in order to keep it alive.
 */
        if (!found && sync_reset && !retrieve_from_waiting_list(0, np, cmd)) {
                cmd->result = ScsiResult(DID_RESET, 0);
                ncr_queue_done_cmd(np, cmd);
        }

        return SCSI_RESET_SUCCESS;
}

/*==========================================================
**
**
**      Abort an SCSI command.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_abort_command (ncb_p np, Scsi_Cmnd *cmd)
{
/*      Scsi_Device        *device    = cmd->device; */
        ccb_p cp;
        int found;
        int retv;

/*
 * First, look for the scsi command in the waiting list
 */
        if (remove_from_waiting_list(np, cmd)) {
                cmd->result = ScsiResult(DID_ABORT, 0);
                ncr_queue_done_cmd(np, cmd);
                return SCSI_ABORT_SUCCESS;
        }

/*
 * Then, look in the wakeup list
 */
        for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
                /*
                **      look for the ccb of this command.
                */
                if (cp->host_status == HS_IDLE) continue;
                if (cp->cmd == cmd) {
                        found = 1;
                        break;
                }
        }

        if (!found) {
                return SCSI_ABORT_NOT_RUNNING;
        }

        if (np->settle_time) {
                return SCSI_ABORT_SNOOZE;
        }

        /*
        **      If the CCB is active, patch schedule jumps for the 
        **      script to abort the command.
        */

        cp->tlimit = 0;
        switch(cp->host_status) {
        case HS_BUSY:
        case HS_NEGOTIATE:
                printk ("%s: abort ccb=%p (cancel)\n", ncr_name (np), cp);
                        cp->start.schedule.l_paddr =
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, cancel));
                retv = SCSI_ABORT_PENDING;
                break;
        case HS_DISCONNECT:
                cp->restart.schedule.l_paddr =
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
                retv = SCSI_ABORT_PENDING;
                break;
        default:
                retv = SCSI_ABORT_NOT_RUNNING;
                break;

        }

        /*
        **      If there are no requests, the script
        **      processor will sleep on SEL_WAIT_RESEL.
        **      Let's wake it up, since it may have to work.
        */
        OUTB (nc_istat, SIGP);

        return retv;
}

/*==========================================================
**
**      Linux release module stuff.
**
**      Called before unloading the module
**      Detach the host.
**      We have to free resources and halt the NCR chip
**
**==========================================================
*/

#ifdef MODULE
static int ncr_detach(ncb_p np)
{
        ccb_p cp;
        tcb_p tp;
        lcb_p lp;
        int target, lun;
        int i;

        printk("%s: releasing host resources\n", ncr_name(np));

/*
**      Stop the ncr_timeout process
**      Set release_stage to 1 and wait that ncr_timeout() set it to 2.
*/

#ifdef DEBUG_NCR53C8XX
        printk("%s: stopping the timer\n", ncr_name(np));
#endif
        np->release_stage = 1;
        for (i = 50 ; i && np->release_stage != 2 ; i--) MDELAY (100);
        if (np->release_stage != 2)
                printk("%s: the timer seems to be already stopped\n", ncr_name(np));
        else np->release_stage = 2;

/*
**      Disable chip interrupts
*/

#ifdef DEBUG_NCR53C8XX
        printk("%s: disabling chip interrupts\n", ncr_name(np));
#endif
        OUTW (nc_sien , 0);
        OUTB (nc_dien , 0);

/*
**      Free irq
*/

#ifdef DEBUG_NCR53C8XX
#ifdef __sparc__
        printk("%s: freeing irq %s\n", ncr_name(np), __irq_itoa(np->irq));
#else
        printk("%s: freeing irq %d\n", ncr_name(np), np->irq);
#endif
#endif
        free_irq(np->irq, np);

        /*
        **      Reset NCR chip
        **      Restore bios setting for automatic clock detection.
        */

        printk("%s: resetting chip\n", ncr_name(np));
        OUTB (nc_istat,  SRST);
        UDELAY (100);
        OUTB (nc_istat,  0   );

        OUTB(nc_dmode,  np->sv_dmode);
        OUTB(nc_dcntl,  np->sv_dcntl);
        OUTB(nc_ctest3, np->sv_ctest3);
        OUTB(nc_ctest4, np->sv_ctest4);
        OUTB(nc_ctest5, np->sv_ctest5);
        OUTB(nc_gpcntl, np->sv_gpcntl);
        OUTB(nc_stest2, np->sv_stest2);

        ncr_selectclock(np, np->sv_scntl3);

        /*
        **      Release Memory mapped IO region and IO mapped region
        */

#ifndef NCR_IOMAPPED
#ifdef DEBUG_NCR53C8XX
        printk("%s: releasing memory mapped IO region %lx[%d]\n", ncr_name(np), (u_long) np->vaddr, 128);
#endif
        unmap_pci_mem((vm_offset_t) np->vaddr, (u_long) 128);
#endif /* !NCR_IOMAPPED */

#ifdef DEBUG_NCR53C8XX
        printk("%s: releasing IO region %x[%d]\n", ncr_name(np), np->port, 128);
#endif
        release_region(np->port, 128);

        /*
        **      Free allocated ccb(s)
        */

        while ((cp=np->ccb->link_ccb) != NULL) {
                np->ccb->link_ccb = cp->link_ccb;
                if (cp->host_status) {
                printk("%s: shall free an active ccb (host_status=%d)\n",
                        ncr_name(np), cp->host_status);
                }
#ifdef DEBUG_NCR53C8XX
        printk("%s: freeing ccb (%lx)\n", ncr_name(np), (u_long) cp);
#endif
                m_free(cp, sizeof(*cp));
        }

        /*
        **      Free allocated tp(s)
        */

        for (target = 0; target < MAX_TARGET ; target++) {
                tp=&np->target[target];
                for (lun = 0 ; lun < MAX_LUN ; lun++) {
                        lp = tp->lp[lun];
                        if (lp) {
#ifdef DEBUG_NCR53C8XX
        printk("%s: freeing lp (%lx)\n", ncr_name(np), (u_long) lp);
#endif
                                if (lp->jump_ccb != &lp->jump_ccb_0)
                                        m_free(lp->jump_ccb, 256);
                                m_free(lp, sizeof(*lp));
                        }
                }
        }

        printk("%s: host resources successfully released\n", ncr_name(np));

        return 1;
}
#endif

/*==========================================================
**
**
**      Complete execution of a SCSI command.
**      Signal completion to the generic SCSI driver.
**
**
**==========================================================
*/

void ncr_complete (ncb_p np, ccb_p cp)
{
        Scsi_Cmnd *cmd;
        tcb_p tp;
        lcb_p lp;

        /*
        **      Sanity check
        */

        if (!cp || cp->magic != CCB_MAGIC || !cp->cmd)
                return;

        /*
        **      timestamp
        **      Optional, spare some CPU time
        */
#ifdef SCSI_NCR_PROFILE_SUPPORT
        ncb_profile (np, cp);
#endif

        if (DEBUG_FLAGS & DEBUG_TINY)
                printk ("CCB=%lx STAT=%x/%x\n", (unsigned long)cp & 0xfff,
                        cp->host_status,cp->scsi_status);

        /*
        **      Get command, target and lun pointers.
        */

        cmd = cp->cmd;
        cp->cmd = NULL;
        tp = &np->target[cmd->target];
        lp = tp->lp[cmd->lun];

        /*
        **      We donnot queue more than 1 ccb per target 
        **      with negotiation at any time. If this ccb was 
        **      used for negotiation, clear this info in the tcb.
        */

        if (cp == tp->nego_cp)
                tp->nego_cp = 0;

        /*
        **      If auto-sense performed, change scsi status.
        */
        if (cp->auto_sense) {
                cp->scsi_status = cp->auto_sense;
        }

        /*
        **      If we were recovering from queue full or performing 
        **      auto-sense, requeue skipped CCBs to the wait queue.
        */

        if (lp && lp->held_ccb) {
                if (cp == lp->held_ccb) {
                        xpt_que_splice(&lp->skip_ccbq, &lp->wait_ccbq);
                        xpt_que_init(&lp->skip_ccbq);
                        lp->held_ccb = 0;
                }
        }

        /*
        **      Check for parity errors.
        */

        if (cp->parity_status > 1) {
                PRINT_ADDR(cmd);
                printk ("%d parity error(s).\n",cp->parity_status);
        }

        /*
        **      Check for extended errors.
        */

        if (cp->xerr_status != XE_OK) {
                PRINT_ADDR(cmd);
                switch (cp->xerr_status) {
                case XE_EXTRA_DATA:
                        printk ("extraneous data discarded.\n");
                        break;
                case XE_BAD_PHASE:
                        printk ("illegal scsi phase (4/5).\n");
                        break;
                default:
                        printk ("extended error %d.\n", cp->xerr_status);
                        break;
                }
                if (cp->host_status==HS_COMPLETE)
                        cp->host_status = HS_FAIL;
        }

        /*
        **      Print out any error for debugging purpose.
        */
        if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
                if (cp->host_status!=HS_COMPLETE || cp->scsi_status!=S_GOOD) {
                        PRINT_ADDR(cmd);
                        printk ("ERROR: cmd=%x host_status=%x scsi_status=%x\n",
                                cmd->cmnd[0], cp->host_status, cp->scsi_status);
                }
        }

        /*
        **      Check the status.
        */
        if (   (cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_GOOD ||
                    cp->scsi_status == S_COND_MET)) {
                /*
                **      All went well (GOOD status).
                **      CONDITION MET status is returned on 
                **      `Pre-Fetch' or `Search data' success.
                */
                cmd->result = ScsiResult(DID_OK, cp->scsi_status);

                /*
                **      @RESID@
                **      Could dig out the correct value for resid,
                **      but it would be quite complicated.
                */
                /* if (cp->phys.header.lastp != cp->phys.header.goalp) */

                /*
                **      Allocate the lcb if not yet.
                */
                if (!lp)
                        ncr_alloc_lcb (np, cmd->target, cmd->lun);

                /*
                **      On standard INQUIRY response (EVPD and CmDt 
                **      not set), setup logical unit according to 
                **      announced capabilities (we need the 1rst 7 bytes).
                */
                if (cmd->cmnd[0] == 0x12 && !(cmd->cmnd[1] & 0x3) &&
                    cmd->cmnd[4] >= 7 && !cmd->use_sg) {
                        ncr_setup_lcb (np, cmd->target, cmd->lun,
                                       (char *) cmd->request_buffer);
                }

                tp->bytes     += cp->data_len;
                tp->transfers ++;

                /*
                **      If tags was reduced due to queue full,
                **      increase tags if 1000 good status received.
                */
                if (lp && lp->usetags && lp->numtags < lp->maxtags) {
                        ++lp->num_good;
                        if (lp->num_good >= 1000) {
                                lp->num_good = 0;
                                ++lp->numtags;
                                ncr_setup_tags (np, cmd->target, cmd->lun);
                        }
                }
        } else if ((cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_CHECK_COND)) {
                /*
                **   Check condition code
                */
                cmd->result = ScsiResult(DID_OK, S_CHECK_COND);

                if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
                        u_char * p = (u_char*) & cmd->sense_buffer;
                        int i;
                        PRINT_ADDR(cmd);
                        printk ("sense data:");
                        for (i=0; i<14; i++) printk (" %x", *p++);
                        printk (".\n");
                }

        } else if ((cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_BUSY ||
                    cp->scsi_status == S_QUEUE_FULL)) {

                /*
                **   Target is busy.
                */
                cmd->result = ScsiResult(DID_OK, cp->scsi_status);

        } else if ((cp->host_status == HS_SEL_TIMEOUT)
                || (cp->host_status == HS_TIMEOUT)) {

                /*
                **   No response
                */
                cmd->result = ScsiResult(DID_TIME_OUT, cp->scsi_status);

        } else if (cp->host_status == HS_RESET) {

                /*
                **   SCSI bus reset
                */
                cmd->result = ScsiResult(DID_RESET, cp->scsi_status);

        } else if (cp->host_status == HS_ABORTED) {

                /*
                **   Transfer aborted
                */
                cmd->result = ScsiResult(DID_ABORT, cp->scsi_status);

        } else {

                /*
                **  Other protocol messes
                */
                PRINT_ADDR(cmd);
                printk ("COMMAND FAILED (%x %x) @%p.\n",
                        cp->host_status, cp->scsi_status, cp);

                cmd->result = ScsiResult(DID_ERROR, cp->scsi_status);
        }

        /*
        **      trace output
        */

        if (tp->usrflag & UF_TRACE) {
                u_char * p;
                int i;
                PRINT_ADDR(cmd);
                printk (" CMD:");
                p = (u_char*) &cmd->cmnd[0];
                for (i=0; i<cmd->cmd_len; i++) printk (" %x", *p++);

                if (cp->host_status==HS_COMPLETE) {
                        switch (cp->scsi_status) {
                        case S_GOOD:
                                printk ("  GOOD");
                                break;
                        case S_CHECK_COND:
                                printk ("  SENSE:");
                                p = (u_char*) &cmd->sense_buffer;
                                for (i=0; i<14; i++)
                                        printk (" %x", *p++);
                                break;
                        default:
                                printk ("  STAT: %x\n", cp->scsi_status);
                                break;
                        }
                } else printk ("  HOSTERROR: %x", cp->host_status);
                printk ("\n");
        }

        /*
        **      Free this ccb
        */
        ncr_free_ccb (np, cp);

        /*
        **      requeue awaiting scsi commands for this lun.
        */
        if (lp && lp->queuedccbs < lp->queuedepth &&
            !xpt_que_empty(&lp->wait_ccbq))
                ncr_start_next_ccb(np, lp, 2);

        /*
        **      requeue awaiting scsi commands for this controller.
        */
        if (np->waiting_list)
                requeue_waiting_list(np);

        /*
        **      signal completion to generic driver.
        */
        ncr_queue_done_cmd(np, cmd);
}

/*==========================================================
**
**
**      Signal all (or one) control block done.
**
**
**==========================================================
*/

/*
**      This CCB has been skipped by the NCR.
**      Queue it in the correponding unit queue.
*/
static void ncr_ccb_skipped(ncb_p np, ccb_p cp)
{
        tcb_p tp = &np->target[cp->target];
        lcb_p lp = tp->lp[cp->lun];

        if (lp && cp != np->ccb) {
                cp->host_status &= ~HS_SKIPMASK;
                cp->start.schedule.l_paddr = 
                        cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
                xpt_remque(&cp->link_ccbq);
                xpt_insque_tail(&cp->link_ccbq, &lp->skip_ccbq);
                if (cp->queued) {
                        --lp->queuedccbs;
                }
        }
        if (cp->queued) {
                --np->queuedccbs;
                cp->queued = 0;
        }
}

/*
**      The NCR has completed CCBs.
**      Look at the DONE QUEUE if enabled, otherwise scan all CCBs
*/
void ncr_wakeup_done (ncb_p np)
{
        ccb_p cp;
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
        int i, j;

        i = np->ccb_done_ic;
        while (1) {
                j = i+1;
                if (j >= MAX_DONE)
                        j = 0;

                cp = np->ccb_done[j];
                if (!CCB_DONE_VALID(cp))
                        break;

                np->ccb_done[j] = (ccb_p) CCB_DONE_EMPTY;
                np->scripth->done_queue[5*j + 4] =
                                cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
                MEMORY_BARRIER();
                np->scripth->done_queue[5*i + 4] =
                                cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));

                if (cp->host_status & HS_DONEMASK)
                        ncr_complete (np, cp);
                else if (cp->host_status & HS_SKIPMASK)
                        ncr_ccb_skipped (np, cp);

                i = j;
        }
        np->ccb_done_ic = i;
#else
        cp = np->ccb;
        while (cp) {
                if (cp->host_status & HS_DONEMASK)
                        ncr_complete (np, cp);
                else if (cp->host_status & HS_SKIPMASK)
                        ncr_ccb_skipped (np, cp);
                cp = cp->link_ccb;
        }
#endif
}

/*
**      Complete all active CCBs.
*/
void ncr_wakeup (ncb_p np, u_long code)
{
        ccb_p cp = np->ccb;

        while (cp) {
                if (cp->host_status != HS_IDLE) {
                        cp->host_status = code;
                        ncr_complete (np, cp);
                }
                cp = cp->link_ccb;
        }
}

/*==========================================================
**
**
**      Start NCR chip.
**
**
**==========================================================
*/

void ncr_init (ncb_p np, int reset, char * msg, u_long code)
{
        int     i;

        /*
        **      Reset chip if asked, otherwise just clear fifos.
        */

        if (reset) {
                OUTB (nc_istat,  SRST);
                UDELAY (100);
        }
        else {
                OUTB (nc_stest3, TE|CSF);
                OUTONB (nc_ctest3, CLF);
        }
 
        /*
        **      Message.
        */

        if (msg) printk (KERN_INFO "%s: restart (%s).\n", ncr_name (np), msg);

        /*
        **      Clear Start Queue
        */
        np->queuedepth = MAX_START - 1; /* 1 entry needed as end marker */
        for (i = 1; i < MAX_START + MAX_START; i += 2)
                np->scripth0->tryloop[i] =
                                cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));

        /*
        **      Start at first entry.
        */
        np->squeueput = 0;
        np->script0->startpos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np, tryloop));

        /*
        **      Clear Done Queue
        */
        for (i = 0; i < MAX_DONE; i++) {
                np->ccb_done[i] = (ccb_p) CCB_DONE_EMPTY;
                np->scripth0->done_queue[5*i + 4] =
                        cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
        }

        /*
        **      Start at first entry.
        */
        np->script0->done_pos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np,done_queue));
        np->ccb_done_ic = MAX_DONE-1;
        np->scripth0->done_queue[5*(MAX_DONE-1) + 4] =
                        cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));

        /*
        **      Wakeup all pending jobs.
        */
        ncr_wakeup (np, code);

        /*
        **      Init chip.
        */

        OUTB (nc_istat,  0x00   );      /*  Remove Reset, abort */
        UDELAY (2000);  /* The 895 needs time for the bus mode to settle */

        OUTB (nc_scntl0, np->rv_scntl0 | 0xc0);
                                        /*  full arb., ena parity, par->ATN  */
        OUTB (nc_scntl1, 0x00);         /*  odd parity, and remove CRST!! */

        ncr_selectclock(np, np->rv_scntl3);     /* Select SCSI clock */

        OUTB (nc_scid  , RRE|np->myaddr);       /* Adapter SCSI address */
        OUTW (nc_respid, 1ul<<np->myaddr);      /* Id to respond to */
        OUTB (nc_istat , SIGP   );              /*  Signal Process */
        OUTB (nc_dmode , np->rv_dmode);         /* Burst length, dma mode */
        OUTB (nc_ctest5, np->rv_ctest5);        /* Large fifo + large burst */

        OUTB (nc_dcntl , NOCOM|np->rv_dcntl);   /* Protect SFBR */
        OUTB (nc_ctest3, np->rv_ctest3);        /* Write and invalidate */
        OUTB (nc_ctest4, np->rv_ctest4);        /* Master parity checking */

        OUTB (nc_stest2, EXT|np->rv_stest2);    /* Extended Sreq/Sack filtering */
        OUTB (nc_stest3, TE);                   /* TolerANT enable */
        OUTB (nc_stime0, 0x0c   );              /* HTH disabled  STO 0.25 sec */

        /*
        **      Disable disconnects.
        */

        np->disc = 0;

        /*
        **    Enable GPIO0 pin for writing if LED support.
        */

        if (np->features & FE_LED0) {
                OUTOFFB (nc_gpcntl, 0x01);
        }

        /*
        **      enable ints
        */

        OUTW (nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
        OUTB (nc_dien , MDPE|BF|ABRT|SSI|SIR|IID);

        /*
        **      For 895/6 enable SBMC interrupt and save current SCSI bus mode.
        */
        if (np->features & FE_ULTRA2) {
                OUTONW (nc_sien, SBMC);
                np->scsi_mode = INB (nc_stest4) & SMODE;
        }

        /*
        **      DEL 441 - 53C876 Rev 5 - Part Number 609-0392787/2788 - ITEM 2.
        **      Disable overlapped arbitration.
        **      The 896 Rev 1 is also affected by this errata.
        */
        if (np->device_id == PCI_DEVICE_ID_NCR_53C875 &&
            np->revision_id >= 0x10 && np->revision_id <= 0x15)
                OUTB (nc_ctest0, (1<<5));
        else if (np->device_id == PCI_DEVICE_ID_NCR_53C896 &&
                 np->revision_id <= 0x1)
                OUTB (nc_ccntl0, DPR);

        /*
        **      Fill in target structure.
        **      Reinitialize usrsync.
        **      Reinitialize usrwide.
        **      Prepare sync negotiation according to actual SCSI bus mode.
        */

        for (i=0;i<MAX_TARGET;i++) {
                tcb_p tp = &np->target[i];

                tp->sval    = 0;
                tp->wval    = np->rv_scntl3;

                if (tp->usrsync != 255) {
                        if (tp->usrsync <= np->maxsync) {
                                if (tp->usrsync < np->minsync) {
                                        tp->usrsync = np->minsync;
                                }
                        }
                        else
                                tp->usrsync = 255;
                };

                if (tp->usrwide > np->maxwide)
                        tp->usrwide = np->maxwide;

                ncr_negotiate (np, tp);
        }

        /*
        **    Start script processor.
        */
        MEMORY_BARRIER();
        if (np->paddr2) {
                if (bootverbose)
                        printk ("%s: Downloading SCSI SCRIPTS.\n",
                                ncr_name(np));
                OUTL (nc_scratcha, vtophys(np->script0));
                OUTL (nc_dsp, NCB_SCRIPTH_PHYS (np, start_ram));
        }
        else
                OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, start));
}

/*==========================================================
**
**      Prepare the negotiation values for wide and
**      synchronous transfers.
**
**==========================================================
*/

static void ncr_negotiate (struct ncb* np, struct tcb* tp)
{
        /*
        **      minsync unit is 4ns !
        */

        u_long minsync = tp->usrsync;

        /*
        **      SCSI bus mode limit
        */

        if (np->scsi_mode && np->scsi_mode == SMODE_SE) {
                if (minsync < 12) minsync = 12;
        }

        /*
        **      our limit ..
        */

        if (minsync < np->minsync)
                minsync = np->minsync;

        /*
        **      divider limit
        */

        if (minsync > np->maxsync)
                minsync = 255;

        tp->minsync = minsync;
        tp->maxoffs = (minsync<255 ? np->maxoffs : 0);

        /*
        **      period=0: has to negotiate sync transfer
        */

        tp->period=0;

        /*
        **      widedone=0: has to negotiate wide transfer
        */
        tp->widedone=0;
}

/*==========================================================
**
**      Get clock factor and sync divisor for a given 
**      synchronous factor period.
**      Returns the clock factor (in sxfer) and scntl3 
**      synchronous divisor field.
**
**==========================================================
*/

static void ncr_getsync(ncb_p np, u_char sfac, u_char *fakp, u_char *scntl3p)
{
        u_long  clk = np->clock_khz;    /* SCSI clock frequency in kHz  */
        int     div = np->clock_divn;   /* Number of divisors supported */
        u_long  fak;                    /* Sync factor in sxfer         */
        u_long  per;                    /* Period in tenths of ns       */
        u_long  kpc;                    /* (per * clk)                  */

        /*
        **      Compute the synchronous period in tenths of nano-seconds
        */
        if      (sfac <= 10)    per = 250;
        else if (sfac == 11)    per = 303;
        else if (sfac == 12)    per = 500;
        else                    per = 40 * sfac;

        /*
        **      Look for the greatest clock divisor that allows an 
        **      input speed faster than the period.
        */
        kpc = per * clk;
        while (--div >= 0)
                if (kpc >= (div_10M[div] << 2)) break;

        /*
        **      Calculate the lowest clock factor that allows an output 
        **      speed not faster than the period.
        */
        fak = (kpc - 1) / div_10M[div] + 1;

#if 0   /* This optimization does not seem very usefull */

        per = (fak * div_10M[div]) / clk;

        /*
        **      Why not to try the immediate lower divisor and to choose 
        **      the one that allows the fastest output speed ?
        **      We dont want input speed too much greater than output speed.
        */
        if (div >= 1 && fak < 8) {
                u_long fak2, per2;
                fak2 = (kpc - 1) / div_10M[div-1] + 1;
                per2 = (fak2 * div_10M[div-1]) / clk;
                if (per2 < per && fak2 <= 8) {
                        fak = fak2;
                        per = per2;
                        --div;
                }
        }
#endif

        if (fak < 4) fak = 4;   /* Should never happen, too bad ... */

        /*
        **      Compute and return sync parameters for the ncr
        */
        *fakp           = fak - 4;
        *scntl3p        = ((div+1) << 4) + (sfac < 25 ? 0x80 : 0);
}


/*==========================================================
**
**      Set actual values, sync status and patch all ccbs of 
**      a target according to new sync/wide agreement.
**
**==========================================================
*/

static void ncr_set_sync_wide_status (ncb_p np, u_char target)
{
        ccb_p cp;
        tcb_p tp = &np->target[target];

        /*
        **      set actual value and sync_status
        */
        OUTB (nc_sxfer, tp->sval);
        np->sync_st = tp->sval;
        OUTB (nc_scntl3, tp->wval);
        np->wide_st = tp->wval;

        /*
        **      patch ALL ccbs of this target.
        */
        for (cp = np->ccb; cp; cp = cp->link_ccb) {
                if (!cp->cmd) continue;
                if (cp->cmd->target != target) continue;
#if 0
                cp->sync_status = tp->sval;
                cp->wide_status = tp->wval;
#endif
                cp->phys.select.sel_scntl3 = tp->wval;
                cp->phys.select.sel_sxfer  = tp->sval;
        };
}

/*==========================================================
**
**      Switch sync mode for current job and it's target
**
**==========================================================
*/

static void ncr_setsync (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer)
{
        Scsi_Cmnd *cmd;
        tcb_p tp;
        u_char target = INB (nc_sdid) & 0x0f;
        u_char idiv;

        assert (cp && cp->cmd);
        if (!cp) return;

        cmd = cp->cmd;
        if (!cmd) return;

        assert (target == (cmd->target & 0xf));

        tp = &np->target[target];

        if (!scntl3 || !(sxfer & 0x1f))
                scntl3 = np->rv_scntl3;
        scntl3 = (scntl3 & 0xf0) | (tp->wval & EWS) | (np->rv_scntl3 & 0x07);

        /*
        **      Deduce the value of controller sync period from scntl3.
        **      period is in tenths of nano-seconds.
        */

        idiv = ((scntl3 >> 4) & 0x7);
        if ((sxfer & 0x1f) && idiv)
                tp->period = (((sxfer>>5)+4)*div_10M[idiv-1])/np->clock_khz;
        else
                tp->period = 0xffff;

        /*
        **       Stop there if sync parameters are unchanged
        */
        if (tp->sval == sxfer && tp->wval == scntl3) return;
        tp->sval = sxfer;
        tp->wval = scntl3;

        /*
        **      Bells and whistles   ;-)
        */
        PRINT_TARGET(np, target);
        if (sxfer & 0x01f) {
                unsigned f10 = 100000 << (tp->widedone ? tp->widedone -1 : 0);
                unsigned mb10 = (f10 + tp->period/2) / tp->period;
                char *scsi;

                /*
                **  Disable extended Sreq/Sack filtering
                */
                if (tp->period <= 2000) OUTOFFB (nc_stest2, EXT);

                /*
                **      Bells and whistles   ;-)
                */
                if      (tp->period < 500)      scsi = "FAST-40";
                else if (tp->period < 1000)     scsi = "FAST-20";
                else if (tp->period < 2000)     scsi = "FAST-10";
                else                            scsi = "FAST-5";

                printk ("%s %sSCSI %d.%d MB/s (%d ns, offset %d)\n", scsi,
                        tp->widedone > 1 ? "WIDE " : "",
                        mb10 / 10, mb10 % 10, tp->period / 10, sxfer & 0x1f);
        } else
                printk ("%sasynchronous.\n", tp->widedone > 1 ? "wide " : "");

        /*
        **      set actual value and sync_status
        **      patch ALL ccbs of this target.
        */
        ncr_set_sync_wide_status(np, target);
}

/*==========================================================
**
**      Switch wide mode for current job and it's target
**      SCSI specs say: a SCSI device that accepts a WDTR 
**      message shall reset the synchronous agreement to 
**      asynchronous mode.
**
**==========================================================
*/

static void ncr_setwide (ncb_p np, ccb_p cp, u_char wide, u_char ack)
{
        Scsi_Cmnd *cmd;
        u_short target = INB (nc_sdid) & 0x0f;
        tcb_p tp;
        u_char  scntl3;
        u_char  sxfer;

        assert (cp && cp->cmd);
        if (!cp) return;

        cmd = cp->cmd;
        if (!cmd) return;

        assert (target == (cmd->target & 0xf));

        tp = &np->target[target];
        tp->widedone  =  wide+1;
        scntl3 = (tp->wval & (~EWS)) | (wide ? EWS : 0);

        sxfer = ack ? 0 : tp->sval;

        /*
        **       Stop there if sync/wide parameters are unchanged
        */
        if (tp->sval == sxfer && tp->wval == scntl3) return;
        tp->sval = sxfer;
        tp->wval = scntl3;

        /*
        **      Bells and whistles   ;-)
        */
        if (bootverbose >= 2) {
                PRINT_TARGET(np, target);
                if (scntl3 & EWS)
                        printk ("WIDE SCSI (16 bit) enabled.\n");
                else
                        printk ("WIDE SCSI disabled.\n");
        }

        /*
        **      set actual value and sync_status
        **      patch ALL ccbs of this target.
        */
        ncr_set_sync_wide_status(np, target);
}

/*==========================================================
**
**      Switch tagged mode for a target.
**
**==========================================================
*/

static void ncr_setup_tags (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = tp->lp[ln];
        u_char   reqtags, maxdepth;

        /*
        **      Just in case ...
        */
        if ((!tp) || (!lp))
                return;

        /*
        **      If SCSI device queue depth is not yet set, leave here.
        */
        if (!lp->scdev_depth)
                return;

        /*
        **      Donnot allow more tags than the SCSI driver can queue 
        **      for this device.
        **      Donnot allow more tags than we can handle.
        */
        maxdepth = lp->scdev_depth;
        if (maxdepth > lp->maxnxs)      maxdepth    = lp->maxnxs;
        if (lp->maxtags > maxdepth)     lp->maxtags = maxdepth;
        if (lp->numtags > maxdepth)     lp->numtags = maxdepth;

        /*
        **      only devices conformant to ANSI Version >= 2
        **      only devices capable of tagged commands
        **      only if enabled by user ..
        */
        if ((lp->inq_byte7 & INQ7_QUEUE) && lp->numtags > 1) {
                reqtags = lp->numtags;
        } else {
                reqtags = 1;
        };

        /*
        **      Update max number of tags
        */
        lp->numtags = reqtags;
        if (lp->numtags > lp->maxtags)
                lp->maxtags = lp->numtags;

        /*
        **      If we want to switch tag mode, we must wait 
        **      for no CCB to be active.
        */
        if      (reqtags > 1 && lp->usetags) {   /* Stay in tagged mode    */
                if (lp->queuedepth == reqtags)   /* Already announced      */
                        return;
                lp->queuedepth  = reqtags;
        }
        else if (reqtags <= 1 && !lp->usetags) { /* Stay in untagged mode  */
                lp->queuedepth  = reqtags;
                return;
        }
        else {                                   /* Want to switch tag mode */
                if (lp->busyccbs)                /* If not yet safe, return */
                        return;
                lp->queuedepth  = reqtags;
                lp->usetags     = reqtags > 1 ? 1 : 0;
        }

        /*
        **      Patch the lun mini-script, according to tag mode.
        */
        lp->jump_tag.l_paddr = lp->usetags?
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_tag)) :
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_notag));

        /*
        **      Announce change to user.
        */
        if (bootverbose) {
                PRINT_LUN(np, tn, ln);
                if (lp->usetags) {
                        printk("tagged command queue depth set to %d\n", reqtags);
                }
                else {
                        printk("tagged command queueing disabled\n");
                }
        }
}

/*----------------------------------------------------
**
**      handle user commands
**
**----------------------------------------------------
*/

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT

static void ncr_usercmd (ncb_p np)
{
        u_char t;
        tcb_p tp;

        switch (np->user.cmd) {

        case 0: return;

        case UC_SETSYNC:
                for (t=0; t<MAX_TARGET; t++) {
                        if (!((np->user.target>>t)&1)) continue;
                        tp = &np->target[t];
                        tp->usrsync = np->user.data;
                        ncr_negotiate (np, tp);
                };
                break;

        case UC_SETTAGS:
                for (t=0; t<MAX_TARGET; t++) {
                        int ln;
                        if (!((np->user.target>>t)&1)) continue;
                        np->target[t].usrtags = np->user.data;
                        for (ln = 0; ln < MAX_LUN; ln++) {
                                lcb_p lp = np->target[t].lp[ln];
                                if (!lp)
                                        continue;
                                lp->maxtags = lp->numtags = np->user.data;
                                ncr_setup_tags (np, t, ln);
                        }
                };
                break;

        case UC_SETDEBUG:
#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
                ncr_debug = np->user.data;
#endif
                break;

        case UC_SETORDER:
                np->order = np->user.data;
                break;

        case UC_SETVERBOSE:
                np->verbose = np->user.data;
                break;

        case UC_SETWIDE:
                for (t=0; t<MAX_TARGET; t++) {
                        u_long size;
                        if (!((np->user.target>>t)&1)) continue;
                        tp = &np->target[t];
                        size = np->user.data;
                        if (size > np->maxwide) size=np->maxwide;
                        tp->usrwide = size;
                        ncr_negotiate (np, tp);
                };
                break;

        case UC_SETFLAG:
                for (t=0; t<MAX_TARGET; t++) {
                        if (!((np->user.target>>t)&1)) continue;
                        tp = &np->target[t];
                        tp->usrflag = np->user.data;
                };
                break;

#ifdef SCSI_NCR_PROFILE_SUPPORT
        case UC_CLEARPROF:
                bzero(&np->profile, sizeof(np->profile));
                break;
#endif
        }
        np->user.cmd=0;
}
#endif

/*==========================================================
**
**
**      ncr timeout handler.
**
**
**==========================================================
**
**      Misused to keep the driver running when
**      interrupts are not configured correctly.
**
**----------------------------------------------------------
*/

static void ncr_timeout (ncb_p np)
{
        u_long  thistime = jiffies;

        /*
        **      If release process in progress, let's go
        **      Set the release stage from 1 to 2 to synchronize
        **      with the release process.
        */

        if (np->release_stage) {
                if (np->release_stage == 1) np->release_stage = 2;
                return;
        }

        np->timer.expires = jiffies + SCSI_NCR_TIMER_INTERVAL;
        add_timer(&np->timer);

        /*
        **      If we are resetting the ncr, wait for settle_time before 
        **      clearing it. Then command processing will be resumed.
        */
        if (np->settle_time) {
                if (np->settle_time <= thistime) {
                        if (bootverbose > 1)
                                printk("%s: command processing resumed\n", ncr_name(np));
                        np->settle_time = 0;
                        np->disc        = 1;
                        requeue_waiting_list(np);
                }
                return;
        }

        /*
        **      Since the generic scsi driver only allows us 0.5 second 
        **      to perform abort of a command, we must look at ccbs about 
        **      every 0.25 second.
        */
        if (np->lasttime + 4*HZ < thistime) {
                /*
                **      block ncr interrupts
                */
                np->lasttime = thistime;

#ifdef SCSI_NCR_PROFILE_SUPPORT
                /*
                **      Reset profile data to avoid ugly overflow
                **      (Limited to 1024 GB for 32 bit architecture)
                */
                if (np->profile.num_kbytes > (~0UL >> 2))
                        bzero(&np->profile, sizeof(np->profile));
#endif
        }

#ifdef SCSI_NCR_BROKEN_INTR
        if (INB(nc_istat) & (INTF|SIP|DIP)) {

                /*
                **      Process pending interrupts.
                */
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("{");
                ncr_exception (np);
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("}");
        }
#endif /* SCSI_NCR_BROKEN_INTR */
}

/*==========================================================
**
**      log message for real hard errors
**
**      "ncr0 targ 0?: ERROR (ds:si) (so-si-sd) (sxfer/scntl3) @ name (dsp:dbc)."
**      "             reg: r0 r1 r2 r3 r4 r5 r6 ..... rf."
**
**      exception register:
**              ds:     dstat
**              si:     sist
**
**      SCSI bus lines:
**              so:     control lines as driver by NCR.
**              si:     control lines as seen by NCR.
**              sd:     scsi data lines as seen by NCR.
**
**      wide/fastmode:
**              sxfer:  (see the manual)
**              scntl3: (see the manual)
**
**      current script command:
**              dsp:    script address (relative to start of script).
**              dbc:    first word of script command.
**
**      First 16 register of the chip:
**              r0..rf
**
**==========================================================
*/

static void ncr_log_hard_error(ncb_p np, u_short sist, u_char dstat)
{
        u_int32 dsp;
        int     script_ofs;
        int     script_size;
        char    *script_name;
        u_char  *script_base;
        int     i;

        dsp     = INL (nc_dsp);

        if (dsp > np->p_script && dsp <= np->p_script + sizeof(struct script)) {
                script_ofs      = dsp - np->p_script;
                script_size     = sizeof(struct script);
                script_base     = (u_char *) np->script0;
                script_name     = "script";
        }
        else if (np->p_scripth < dsp && 
                 dsp <= np->p_scripth + sizeof(struct scripth)) {
                script_ofs      = dsp - np->p_scripth;
                script_size     = sizeof(struct scripth);
                script_base     = (u_char *) np->scripth0;
                script_name     = "scripth";
        } else {
                script_ofs      = dsp;
                script_size     = 0;
                script_base     = 0;
                script_name     = "mem";
        }

        printk ("%s:%d: ERROR (%x:%x) (%x-%x-%x) (%x/%x) @ (%s %x:%08x).\n",
                ncr_name (np), (unsigned)INB (nc_sdid)&0x0f, dstat, sist,
                (unsigned)INB (nc_socl), (unsigned)INB (nc_sbcl), (unsigned)INB (nc_sbdl),
                (unsigned)INB (nc_sxfer),(unsigned)INB (nc_scntl3), script_name, script_ofs,
                (unsigned)INL (nc_dbc));

        if (((script_ofs & 3) == 0) &&
            (unsigned)script_ofs < script_size) {
                printk ("%s: script cmd = %08x\n", ncr_name(np),
                        scr_to_cpu((int) *(ncrcmd *)(script_base + script_ofs)));
        }

        printk ("%s: regdump:", ncr_name(np));
        for (i=0; i<16;i++)
            printk (" %02x", (unsigned)INB_OFF(i));
        printk (".\n");
}

/*============================================================
**
**      ncr chip exception handler.
**
**============================================================
**
**      In normal cases, interrupt conditions occur one at a 
**      time. The ncr is able to stack in some extra registers 
**      other interrupts that will occurs after the first one.
**      But severall interrupts may occur at the same time.
**
**      We probably should only try to deal with the normal 
**      case, but it seems that multiple interrupts occur in 
**      some cases that are not abnormal at all.
**
**      The most frequent interrupt condition is Phase Mismatch.
**      We should want to service this interrupt quickly.
**      A SCSI parity error may be delivered at the same time.
**      The SIR interrupt is not very frequent in this driver, 
**      since the INTFLY is likely used for command completion 
**      signaling.
**      The Selection Timeout interrupt may be triggered with 
**      IID and/or UDC.
**      The SBMC interrupt (SCSI Bus Mode Change) may probably 
**      occur at any time.
**
**      This handler try to deal as cleverly as possible with all
**      the above.
**
**============================================================
*/

void ncr_exception (ncb_p np)
{
        u_char  istat, dstat;
        u_short sist;
        int     i;

        /*
        **      interrupt on the fly ?
        **      Since the global header may be copied back to a CCB 
        **      using a posted PCI memory write, the last operation on 
        **      the istat register is a READ in order to flush posted 
        **      PCI write commands.
        */
        istat = INB (nc_istat);
        if (istat & INTF) {
                OUTB (nc_istat, (istat & SIGP) | INTF);
                istat = INB (nc_istat);
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("F ");
#ifdef SCSI_NCR_PROFILE_SUPPORT
                np->profile.num_fly++;
#endif
                ncr_wakeup_done (np);
        };

        if (!(istat & (SIP|DIP)))
                return;

#ifdef SCSI_NCR_PROFILE_SUPPORT
        np->profile.num_int++;
#endif

        if (istat & CABRT)
                OUTB (nc_istat, CABRT);

        /*
        **      Steinbach's Guideline for Systems Programming:
        **      Never test for an error condition you don't know how to handle.
        */

        sist  = (istat & SIP) ? INW (nc_sist)  : 0;
        dstat = (istat & DIP) ? INB (nc_dstat) : 0;

        if (DEBUG_FLAGS & DEBUG_TINY)
                printk ("<%d|%x:%x|%x:%x>",
                        (int)INB(nc_scr0),
                        dstat,sist,
                        (unsigned)INL(nc_dsp),
                        (unsigned)INL(nc_dbc));

        /*========================================================
        **      First, interrupts we want to service cleanly.
        **
        **      Phase mismatch is the most frequent interrupt, and 
        **      so we have to service it as quickly and as cleanly 
        **      as possible.
        **      Programmed interrupts are rarely used in this driver,
        **      but we must handle them cleanly anyway.
        **      We try to deal with PAR and SBMC combined with 
        **      some other interrupt(s).
        **=========================================================
        */

        if (!(sist  & (STO|GEN|HTH|SGE|UDC|RST)) &&
            !(dstat & (MDPE|BF|ABRT|IID))) {
                if ((sist & SBMC) && ncr_int_sbmc (np))
                        return;
                if ((sist & PAR)  && ncr_int_par  (np))
                        return;
                if (sist & MA) {
                        ncr_int_ma (np);
                        return;
                }
                if (dstat & SIR) {
                        ncr_int_sir (np);
                        return;
                }
                /*
                **  DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 2.
                */
                if (!(sist & (SBMC|PAR)) && !(dstat & SSI)) {
                        printk( "%s: unknown interrupt(s) ignored, "
                                "ISTAT=%x DSTAT=%x SIST=%x\n",
                                ncr_name(np), istat, dstat, sist);
                        return;
                }
                OUTONB (nc_dcntl, (STD|NOCOM));
                return;
        };

        /*========================================================
        **      Now, interrupts that need some fixing up.
        **      Order and multiple interrupts is so less important.
        **
        **      If SRST has been asserted, we just reset the chip.
        **
        **      Selection is intirely handled by the chip. If the 
        **      chip says STO, we trust it. Seems some other 
        **      interrupts may occur at the same time (UDC, IID), so 
        **      we ignore them. In any case we do enough fix-up 
        **      in the service routine.
        **      We just exclude some fatal dma errors.
        **=========================================================
        */

        if (sist & RST) {
                ncr_init (np, 1, bootverbose ? "scsi reset" : NULL, HS_RESET);
                return;
        };

        if ((sist & STO) &&
                !(dstat & (MDPE|BF|ABRT))) {
        /*
        **      DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 1.
        */
                OUTONB (nc_ctest3, CLF);

                ncr_int_sto (np);
                return;
        };

        /*=========================================================
        **      Now, interrupts we are not able to recover cleanly.
        **      (At least for the moment).
        **
        **      Do the register dump.
        **      Log message for real hard errors.
        **      Clear all fifos.
        **      For MDPE, BF, ABORT, IID, SGE and HTH we reset the 
        **      BUS and the chip.
        **      We are more soft for UDC.
        **=========================================================
        */
        if (jiffies - np->regtime > 10*HZ) {
                np->regtime = jiffies;
                for (i = 0; i<sizeof(np->regdump); i++)
                        ((char*)&np->regdump)[i] = INB_OFF(i);
                np->regdump.nc_dstat = dstat;
                np->regdump.nc_sist  = sist;
        };

        ncr_log_hard_error(np, sist, dstat);

        printk ("%s: have to clear fifos.\n", ncr_name (np));
        OUTB (nc_stest3, TE|CSF);
        OUTONB (nc_ctest3, CLF);

        if ((sist & (SGE)) ||
                (dstat & (MDPE|BF|ABRT|IID))) {
                ncr_start_reset(np);
                return;
        };

        if (sist & HTH) {
                printk ("%s: handshake timeout\n", ncr_name(np));
                ncr_start_reset(np);
                return;
        };

        if (sist & UDC) {
                printk ("%s: unexpected disconnect\n", ncr_name(np));
                OUTB (HS_PRT, HS_UNEXPECTED);
                OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, cleanup));
                return;
        };

        /*=========================================================
        **      We just miss the cause of the interrupt. :(
        **      Print a message. The timeout will do the real work.
        **=========================================================
        */
        printk ("%s: unknown interrupt\n", ncr_name(np));
}

/*==========================================================
**
**      ncr chip exception handler for selection timeout
**
**==========================================================
**
**      There seems to be a bug in the 53c810.
**      Although a STO-Interrupt is pending,
**      it continues executing script commands.
**      But it will fail and interrupt (IID) on
**      the next instruction where it's looking
**      for a valid phase.
**
**----------------------------------------------------------
*/

void ncr_int_sto (ncb_p np)
{
        u_long dsa;
        ccb_p cp;
        if (DEBUG_FLAGS & DEBUG_TINY) printk ("T");

        /*
        **      look for ccb and set the status.
        */

        dsa = INL (nc_dsa);
        cp = np->ccb;
        while (cp && (CCB_PHYS (cp, phys) != dsa))
                cp = cp->link_ccb;

        if (cp) {
                cp-> host_status = HS_SEL_TIMEOUT;
                ncr_complete (np, cp);
        };

        /*
        **      repair start queue and jump to start point.
        */

        OUTL (nc_dsp, NCB_SCRIPTH_PHYS (np, sto_restart));
        return;
}

/*==========================================================
**
**      ncr chip exception handler for SCSI bus mode change
**
**==========================================================
**
**      spi2-r12 11.2.3 says a transceiver mode change must 
**      generate a reset event and a device that detects a reset 
**      event shall initiate a hard reset. It says also that a
**      device that detects a mode change shall set data transfer 
**      mode to eight bit asynchronous, etc...
**      So, just resetting should be enough.
**       
**
**----------------------------------------------------------
*/

static int ncr_int_sbmc (ncb_p np)
{
        u_char scsi_mode = INB (nc_stest4) & SMODE;

        if (scsi_mode != np->scsi_mode) {
                printk("%s: SCSI bus mode change from %x to %x.\n",
                        ncr_name(np), np->scsi_mode, scsi_mode);

                np->scsi_mode = scsi_mode;


                /*
                **      Suspend command processing for 1 second and 
                **      reinitialize all except the chip.
                */
                np->settle_time = jiffies + HZ;
                ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
                return 1;
        }
        return 0;
}

/*==========================================================
**
**      ncr chip exception handler for SCSI parity error.
**
**==========================================================
**
**
**----------------------------------------------------------
*/

static int ncr_int_par (ncb_p np)
{
        u_char  hsts    = INB (HS_PRT);
        u_int32 dbc     = INL (nc_dbc);
        u_char  sstat1  = INB (nc_sstat1);
        int phase       = -1;
        int msg         = -1;
        u_int32 jmp;

        printk("%s: SCSI parity error detected: SCR1=%d DBC=%x SSTAT1=%x\n",
                ncr_name(np), hsts, dbc, sstat1);

        /*
         *      Ignore the interrupt if the NCR is not connected 
         *      to the SCSI bus, since the right work should have  
         *      been done on unexpected disconnection handling.
         */
        if (!(INB (nc_scntl1) & ISCON))
                return 0;

        /*
         *      If the nexus is not clearly identified, reset the bus.
         *      We will try to do better later.
         */
        if (hsts & HS_INVALMASK)
                goto reset_all;

        /*
         *      If the SCSI parity error occurs in MSG IN phase, prepare a 
         *      MSG PARITY message. Otherwise, prepare a INITIATOR DETECTED 
         *      ERROR message and let the device decide to retry the command 
         *      or to terminate with check condition. If we were in MSG IN 
         *      phase waiting for the response of a negotiation, we will 
         *      get SIR_NEGO_FAILED at dispatch.
         */
        if (!(dbc & 0xc0000000))
                phase = (dbc >> 24) & 7;
        if (phase == 7)
                msg = M_PARITY;
        else
                msg = M_ID_ERROR;

        /*
         *      If the NCR stopped on a MOVE ^ DATA_IN, we jump to a 
         *      script that will ignore all data in bytes until phase 
         *      change, since we are not sure the chip will wait the phase 
         *      change prior to delivering the interrupt.
         */
        if (phase == 1)
                jmp = NCB_SCRIPTH_PHYS (np, par_err_data_in);
        else
                jmp = NCB_SCRIPTH_PHYS (np, par_err_other);

        OUTONB (nc_ctest3, CLF );       /* clear dma fifo  */
        OUTB (nc_stest3, TE|CSF);       /* clear scsi fifo */

        np->msgout[0] = msg;
        OUTL (nc_dsp, jmp);
        return 1;

reset_all:
        ncr_start_reset(np);
        return 1;
}

/*==========================================================
**
**
**      ncr chip exception handler for phase errors.
**
**
**==========================================================
**
**      We have to construct a new transfer descriptor,
**      to transfer the rest of the current block.
**
**----------------------------------------------------------
*/

static void ncr_int_ma (ncb_p np)
{
        u_int32 dbc;
        u_int32 rest;
        u_int32 dsp;
        u_int32 dsa;
        u_int32 nxtdsp;
        u_int32 *vdsp;
        u_int32 oadr, olen;
        u_int32 *tblp;
        ncrcmd *newcmd;
        u_char  cmd, sbcl;
        ccb_p   cp;

        dsp     = INL (nc_dsp);
        dbc     = INL (nc_dbc);
        sbcl    = INB (nc_sbcl);

        cmd     = dbc >> 24;
        rest    = dbc & 0xffffff;

        /*
        **      Take into account dma fifo and various buffers and latches,
        **      only if the interrupted phase is an OUTPUT phase.
        */

        if ((cmd & 1) == 0) {
                u_char  ctest5, ss0, ss2;
                u_short delta;

                ctest5 = (np->rv_ctest5 & DFS) ? INB (nc_ctest5) : 0;
                if (ctest5 & DFS)
                        delta=(((ctest5 << 8) | (INB (nc_dfifo) & 0xff)) - rest) & 0x3ff;
                else
                        delta=(INB (nc_dfifo) - rest) & 0x7f;

                /*
                **      The data in the dma fifo has not been transfered to
                **      the target -> add the amount to the rest
                **      and clear the data.
                **      Check the sstat2 register in case of wide transfer.
                */

                rest += delta;
                ss0  = INB (nc_sstat0);
                if (ss0 & OLF) rest++;
                if (ss0 & ORF) rest++;
                if (INB(nc_scntl3) & EWS) {
                        ss2 = INB (nc_sstat2);
                        if (ss2 & OLF1) rest++;
                        if (ss2 & ORF1) rest++;
                };

                if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
                        printk ("P%x%x RL=%d D=%d SS0=%x ", cmd&7, sbcl&7,
                                (unsigned) rest, (unsigned) delta, ss0);

        } else  {
                if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
                        printk ("P%x%x RL=%d ", cmd&7, sbcl&7, rest);
        }

        /*
        **      Clear fifos.
        */
        OUTONB (nc_ctest3, CLF );       /* clear dma fifo  */
        OUTB (nc_stest3, TE|CSF);       /* clear scsi fifo */

        /*
        **      locate matching cp.
        **      if the interrupted phase is DATA IN or DATA OUT,
        **      trust the global header.
        */
        dsa = INL (nc_dsa);
        if (!(cmd & 6)) {
                cp = np->header.cp;
                if (CCB_PHYS(cp, phys) != dsa)
                        cp = 0;
        } else {
                cp  = np->ccb;
                while (cp && (CCB_PHYS (cp, phys) != dsa))
                        cp = cp->link_ccb;
        }

        /*
        **      try to find the interrupted script command,
        **      and the address at which to continue.
        */
        vdsp    = 0;
        nxtdsp  = 0;
        if      (dsp >  np->p_script &&
                 dsp <= np->p_script + sizeof(struct script)) {
                vdsp = (u_int32 *)((char*)np->script0 + (dsp-np->p_script-8));
                nxtdsp = dsp;
        }
        else if (dsp >  np->p_scripth &&
                 dsp <= np->p_scripth + sizeof(struct scripth)) {
                vdsp = (u_int32 *)((char*)np->scripth0 + (dsp-np->p_scripth-8));
                nxtdsp = dsp;
        }
        else if (cp) {
                if      (dsp == vtophys (&cp->patch[2])) {
                        vdsp = &cp->patch[0];
                        nxtdsp = scr_to_cpu(vdsp[3]);
                }
                else if (dsp == vtophys (&cp->patch[6])) {
                        vdsp = &cp->patch[4];
                        nxtdsp = scr_to_cpu(vdsp[3]);
                }
        }

        /*
        **      log the information
        */

        if (DEBUG_FLAGS & DEBUG_PHASE) {
                printk ("\nCP=%p CP2=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
                        cp, np->header.cp,
                        (unsigned)dsp,
                        (unsigned)nxtdsp, vdsp, cmd);
        };

        /*
        **      cp=0 means that the DSA does not point to a valid control 
        **      block. This should not happen since we donnot use multi-byte 
        **      move while we are being reselected ot after command complete.
        **      We are not able to recover from such a phase error.
        */
        if (!cp) {
                printk ("%s: SCSI phase error fixup: "
                        "CCB already dequeued (0x%08lx)\n", 
                        ncr_name (np), (u_long) np->header.cp);
                goto reset_all;
        }

        /*
        **      get old startaddress and old length.
        */

        oadr = scr_to_cpu(vdsp[1]);

        if (cmd & 0x10) {       /* Table indirect */
                tblp = (u_int32 *) ((char*) &cp->phys + oadr);
                olen = scr_to_cpu(tblp[0]);
                oadr = scr_to_cpu(tblp[1]);
        } else {
                tblp = (u_int32 *) 0;
                olen = scr_to_cpu(vdsp[0]) & 0xffffff;
        };

        if (DEBUG_FLAGS & DEBUG_PHASE) {
                printk ("OCMD=%x\nTBLP=%p OLEN=%x OADR=%x\n",
                        (unsigned) (scr_to_cpu(vdsp[0]) >> 24),
                        tblp,
                        (unsigned) olen,
                        (unsigned) oadr);
        };

        /*
        **      check cmd against assumed interrupted script command.
        */

        if (cmd != (scr_to_cpu(vdsp[0]) >> 24)) {
                PRINT_ADDR(cp->cmd);
                printk ("internal error: cmd=%02x != %02x=(vdsp[0] >> 24)\n",
                        (unsigned)cmd, (unsigned)scr_to_cpu(vdsp[0]) >> 24);

                goto reset_all;
        }

        /*
        **      cp != np->header.cp means that the header of the CCB 
        **      currently being processed has not yet been copied to 
        **      the global header area. That may happen if the device did 
        **      not accept all our messages after having been selected.
        */
        if (cp != np->header.cp) {
                printk ("%s: SCSI phase error fixup: "
                        "CCB address mismatch (0x%08lx != 0x%08lx)\n", 
                        ncr_name (np), (u_long) cp, (u_long) np->header.cp);
        }

        /*
        **      if old phase not dataphase, leave here.
        */

        if (cmd & 0x06) {
                PRINT_ADDR(cp->cmd);
                printk ("phase change %x-%x %d@%08x resid=%d.\n",
                        cmd&7, sbcl&7, (unsigned)olen,
                        (unsigned)oadr, (unsigned)rest);
                goto unexpected_phase;
        };

        /*
        **      choose the correct patch area.
        **      if savep points to one, choose the other.
        */

        newcmd = cp->patch;
        if (cp->phys.header.savep == cpu_to_scr(vtophys (newcmd))) newcmd+=4;

        /*
        **      fillin the commands
        */

        newcmd[0] = cpu_to_scr(((cmd & 0x0f) << 24) | rest);
        newcmd[1] = cpu_to_scr(oadr + olen - rest);
        newcmd[2] = cpu_to_scr(SCR_JUMP);
        newcmd[3] = cpu_to_scr(nxtdsp);

        if (DEBUG_FLAGS & DEBUG_PHASE) {
                PRINT_ADDR(cp->cmd);
                printk ("newcmd[%d] %x %x %x %x.\n",
                        (int) (newcmd - cp->patch),
                        (unsigned)scr_to_cpu(newcmd[0]),
                        (unsigned)scr_to_cpu(newcmd[1]),
                        (unsigned)scr_to_cpu(newcmd[2]),
                        (unsigned)scr_to_cpu(newcmd[3]));
        }
        /*
        **      fake the return address (to the patch).
        **      and restart script processor at dispatcher.
        */
#ifdef SCSI_NCR_PROFILE_SUPPORT
        np->profile.num_break++;
#endif
        OUTL (nc_temp, vtophys (newcmd));
        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, dispatch));
        return;

        /*
        **      Unexpected phase changes that occurs when the current phase 
        **      is not a DATA IN or DATA OUT phase are due to error conditions.
        **      Such event may only happen when the SCRIPTS is using a 
        **      multibyte SCSI MOVE.
        **
        **      Phase change            Some possible cause
        **
        **      COMMAND  --> MSG IN     SCSI parity error detected by target.
        **      COMMAND  --> STATUS     Bad command or refused by target.
        **      MSG OUT  --> MSG IN     Message rejected by target.
        **      MSG OUT  --> COMMAND    Bogus target that discards extended
        **                              negotiation messages.
        **
        **      The code below does not care of the new phase and so 
        **      trusts the target. Why to annoy it ?
        **      If the interrupted phase is COMMAND phase, we restart at
        **      dispatcher.
        **      If a target does not get all the messages after selection, 
        **      the code assumes blindly that the target discards extended 
        **      messages and clears the negotiation status.
        **      If the target does not want all our response to negotiation,
        **      we force a SIR_NEGO_PROTO interrupt (it is a hack that avoids 
        **      bloat for such a should_not_happen situation).
        **      In all other situation, we reset the BUS.
        **      Are these assumptions reasonnable ? (Wait and see ...)
        */
unexpected_phase:
        dsp -= 8;
        nxtdsp = 0;

        switch (cmd & 7) {
        case 2: /* COMMAND phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
                break;
#if 0
        case 3: /* STATUS  phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
                break;
#endif
        case 6: /* MSG OUT phase */
                np->scripth->nxtdsp_go_on[0] = cpu_to_scr(dsp + 8);
                if      (dsp == NCB_SCRIPT_PHYS (np, send_ident)) {
                        cp->host_status = HS_BUSY;
                        nxtdsp = NCB_SCRIPTH_PHYS (np, clratn_go_on);
                }
                else if (dsp == NCB_SCRIPTH_PHYS (np, send_wdtr) ||
                         dsp == NCB_SCRIPTH_PHYS (np, send_sdtr)) {
                        nxtdsp = NCB_SCRIPTH_PHYS (np, nego_bad_phase);
                }
                break;
#if 0
        case 7: /* MSG IN  phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, clrack);
                break;
#endif
        }

        if (nxtdsp) {
                OUTL (nc_dsp, nxtdsp);
                return;
        }

reset_all:
        ncr_start_reset(np);
}


static void ncr_sir_to_redo(ncb_p np, int num, ccb_p cp)
{
        Scsi_Cmnd *cmd  = cp->cmd;
        tcb_p tp        = &np->target[cmd->target];
        lcb_p lp        = tp->lp[cmd->lun];
        XPT_QUEHEAD     *qp;
        ccb_p           cp2;
        int             disc_cnt = 0;
        int             busy_cnt = 0;
        u_int32         startp;
        u_char          s_status = INB (SS_PRT);

        /*
        **      Let the SCRIPTS processor skip all not yet started CCBs,
        **      and count disconnected CCBs. Since the busy queue is in 
        **      the same order as the chip start queue, disconnected CCBs 
        **      are before cp and busy ones after.
        */
        if (lp) {
                qp = lp->busy_ccbq.blink;
                while (qp != &lp->busy_ccbq) {
                        cp2 = xpt_que_entry(qp, struct ccb, link_ccbq);
                        qp  = qp->blink;
                        ++busy_cnt;
                        if (cp2 == cp)
                                break;
                        cp2->start.schedule.l_paddr =
                        cpu_to_scr(NCB_SCRIPTH_PHYS (np, skip));
                }
                lp->held_ccb = cp;      /* Requeue when this one completes */
                disc_cnt = lp->queuedccbs - busy_cnt;
        }

        switch(s_status) {
        default:        /* Just for safety, should never happen */
        case S_QUEUE_FULL:
                /*
                **      Decrease number of tags to the number of 
                **      disconnected commands.
                */
                if (!lp)
                        goto out;
                if (bootverbose >= 1) {
                        PRINT_ADDR(cmd);
                        printk ("QUEUE FULL! %d busy, %d disconnected CCBs\n",
                                busy_cnt, disc_cnt);
                }
                if (disc_cnt < lp->numtags) {
                        lp->numtags     = disc_cnt > 2 ? disc_cnt : 2;
                        lp->num_good    = 0;
                        ncr_setup_tags (np, cmd->target, cmd->lun);
                }
                /*
                **      Requeue the command to the start queue.
                **      If any disconnected commands,
                **              Clear SIGP.
                **              Jump to reselect.
                */
                cp->phys.header.savep = cp->startp;
                cp->host_status = HS_BUSY;
                cp->scsi_status = S_ILLEGAL;

                ncr_put_start_queue(np, cp);
                if (disc_cnt)
                        INB (nc_ctest2);                /* Clear SIGP */
                OUTL (nc_dsp,   NCB_SCRIPT_PHYS (np, reselect));
                return;
        case S_TERMINATED:
        case S_CHECK_COND:
                /*
                **      If we were requesting sense, give up.
                */
                if (cp->auto_sense)
                        goto out;

                /*
                **      Device returned CHECK CONDITION status.
                **      Prepare all needed data strutures for getting 
                **      sense data.
                **
                **      identify message
                */
                cp->scsi_smsg2[0]       = M_IDENTIFY | cmd->lun;
                cp->phys.smsg.addr      = cpu_to_scr(CCB_PHYS (cp, scsi_smsg2));
                cp->phys.smsg.size      = cpu_to_scr(1);

                /*
                **      sense command
                */
                cp->phys.cmd.addr       = cpu_to_scr(CCB_PHYS (cp, sensecmd));
                cp->phys.cmd.size       = cpu_to_scr(6);

                /*
                **      patch requested size into sense command
                */
                cp->sensecmd[0]         = 0x03;
                cp->sensecmd[1]         = cmd->lun << 5;
                cp->sensecmd[4]         = sizeof(cmd->sense_buffer);

                /*
                **      sense data
                */
                cp->phys.sense.addr     =
                                cpu_to_scr(vtophys (&cmd->sense_buffer[0]));
                cp->phys.sense.size     =
                                cpu_to_scr(sizeof(cmd->sense_buffer));

                /*
                **      requeue the command.
                */
                startp = cpu_to_scr(NCB_SCRIPTH_PHYS (np, sdata_in));

                cp->phys.header.savep   = startp;
                cp->phys.header.goalp   = startp + 24;
                cp->phys.header.lastp   = startp;
                cp->phys.header.wgoalp  = startp + 24;
                cp->phys.header.wlastp  = startp;

                cp->host_status = HS_BUSY;
                cp->scsi_status = S_ILLEGAL;
                cp->auto_sense  = s_status;

                cp->start.schedule.l_paddr =
                        cpu_to_scr(NCB_SCRIPT_PHYS (np, select));

                /*
                **      Select without ATN for quirky devices.
                */
                if (tp->quirks & QUIRK_NOMSG)
                        cp->start.schedule.l_paddr =
                        cpu_to_scr(NCB_SCRIPTH_PHYS (np, select_no_atn));

                ncr_put_start_queue(np, cp);

                OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, start));
                return;
        }

out:
        OUTONB (nc_dcntl, (STD|NOCOM));
        return;
}


/*==========================================================
**
**
**      ncr chip exception handler for programmed interrupts.
**
**
**==========================================================
*/

static int ncr_show_msg (u_char * msg)
{
        u_char i;
        printk ("%x",*msg);
        if (*msg==M_EXTENDED) {
                for (i=1;i<8;i++) {
                        if (i-1>msg[1]) break;
                        printk ("-%x",msg[i]);
                };
                return (i+1);
        } else if ((*msg & 0xf0) == 0x20) {
                printk ("-%x",msg[1]);
                return (2);
        };
        return (1);
}


void ncr_int_sir (ncb_p np)
{
        u_char scntl3;
        u_char chg, ofs, per, fak, wide;
        u_char num = INB (nc_dsps);
        ccb_p   cp=0;
        u_long  dsa    = INL (nc_dsa);
        u_char  target = INB (nc_sdid) & 0x0f;
        tcb_p   tp     = &np->target[target];

        if (DEBUG_FLAGS & DEBUG_TINY) printk ("I#%d", num);

        switch (num) {
        case SIR_RESEL_NO_MSG_IN:
        case SIR_RESEL_NO_IDENTIFY:
                /*
                **      If devices reselecting without sending an IDENTIFY 
                **      message still exist, this should help.
                **      We just assume lun=0, 1 CCB, no tag.
                */
                if (tp->lp[0]) { 
                        OUTL (nc_dsp, scr_to_cpu(tp->lp[0]->jump_ccb[0]));
                        return;
                }
        case SIR_RESEL_BAD_TARGET:      /* Will send a TARGET RESET message */
        case SIR_RESEL_BAD_LUN:         /* Will send a TARGET RESET message */
        case SIR_RESEL_BAD_I_T_L_Q:     /* Will send an ABORT TAG message   */
        case SIR_RESEL_BAD_I_T_L:       /* Will send an ABORT message       */
                printk ("%s:%d: SIR %d, "
                        "incorrect nexus identification on reselection\n",
                        ncr_name (np), target, num);
                goto out;
        case SIR_DONE_OVERFLOW:
                printk ("%s:%d: SIR %d, "
                        "CCB done queue overflow\n",
                        ncr_name (np), target, num);
                goto out;
        case SIR_BAD_STATUS:
                cp = np->header.cp;
                if (!cp || CCB_PHYS (cp, phys) != dsa)
                        goto out;
                ncr_sir_to_redo(np, num, cp);
                return;
        default:
                /*
                **      lookup the ccb
                */
                cp = np->ccb;
                while (cp && (CCB_PHYS (cp, phys) != dsa))
                        cp = cp->link_ccb;

                assert (cp && cp == np->header.cp);

                if (!cp || cp != np->header.cp)
                        goto out;
        }

        switch (num) {
/*-----------------------------------------------------------------------------
**
**      Was Sie schon immer ueber transfermode negotiation wissen wollten ...
**
**      We try to negotiate sync and wide transfer only after
**      a successfull inquire command. We look at byte 7 of the
**      inquire data to determine the capabilities of the target.
**
**      When we try to negotiate, we append the negotiation message
**      to the identify and (maybe) simple tag message.
**      The host status field is set to HS_NEGOTIATE to mark this
**      situation.
**
**      If the target doesn't answer this message immidiately
**      (as required by the standard), the SIR_NEGO_FAIL interrupt
**      will be raised eventually.
**      The handler removes the HS_NEGOTIATE status, and sets the
**      negotiated value to the default (async / nowide).
**
**      If we receive a matching answer immediately, we check it
**      for validity, and set the values.
**
**      If we receive a Reject message immediately, we assume the
**      negotiation has failed, and fall back to standard values.
**
**      If we receive a negotiation message while not in HS_NEGOTIATE
**      state, it's a target initiated negotiation. We prepare a
**      (hopefully) valid answer, set our parameters, and send back 
**      this answer to the target.
**
**      If the target doesn't fetch the answer (no message out phase),
**      we assume the negotiation has failed, and fall back to default
**      settings.
**
**      When we set the values, we adjust them in all ccbs belonging 
**      to this target, in the controller's register, and in the "phys"
**      field of the controller's struct ncb.
**
**      Possible cases:            hs  sir   msg_in value  send   goto
**      We try to negotiate:
**      -> target doesnt't msgin   NEG FAIL  noop   defa.  -      dispatch
**      -> target rejected our msg NEG FAIL  reject defa.  -      dispatch
**      -> target answered  (ok)   NEG SYNC  sdtr   set    -      clrack
**      -> target answered (!ok)   NEG SYNC  sdtr   defa.  REJ--->msg_bad
**      -> target answered  (ok)   NEG WIDE  wdtr   set    -      clrack
**      -> target answered (!ok)   NEG WIDE  wdtr   defa.  REJ--->msg_bad
**      -> any other msgin         NEG FAIL  noop   defa.  -      dispatch
**
**      Target tries to negotiate:
**      -> incoming message        --- SYNC  sdtr   set    SDTR   -
**      -> incoming message        --- WIDE  wdtr   set    WDTR   -
**      We sent our answer:
**      -> target doesn't msgout   --- PROTO ?      defa.  -      dispatch
**
**-----------------------------------------------------------------------------
*/

        case SIR_NEGO_FAILED:
                /*-------------------------------------------------------
                **
                **      Negotiation failed.
                **      Target doesn't send an answer message,
                **      or target rejected our message.
                **
                **      Remove negotiation request.
                **
                **-------------------------------------------------------
                */
                OUTB (HS_PRT, HS_BUSY);

                /* fall through */

        case SIR_NEGO_PROTO:
                /*-------------------------------------------------------
                **
                **      Negotiation failed.
                **      Target doesn't fetch the answer message.
                **
                **-------------------------------------------------------
                */

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("negotiation failed sir=%x status=%x.\n",
                                num, cp->nego_status);
                };

                /*
                **      any error in negotiation:
                **      fall back to default mode.
                */
                switch (cp->nego_status) {

                case NS_SYNC:
                        ncr_setsync (np, cp, 0, 0xe0);
                        break;

                case NS_WIDE:
                        ncr_setwide (np, cp, 0, 0);
                        break;

                };
                np->msgin [0] = M_NOOP;
                np->msgout[0] = M_NOOP;
                cp->nego_status = 0;
                break;

        case SIR_NEGO_SYNC:
                /*
                **      Synchronous request message received.
                */

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("sync msgin: ");
                        (void) ncr_show_msg (np->msgin);
                        printk (".\n");
                };

                /*
                **      get requested values.
                */

                chg = 0;
                per = np->msgin[3];
                ofs = np->msgin[4];
                if (ofs==0) per=255;

                /*
                **      if target sends SDTR message,
                **            it CAN transfer synch.
                */

                if (ofs)
                        tp->inq_byte7 |= INQ7_SYNC;

                /*
                **      check values against driver limits.
                */

                if (per < np->minsync)
                        {chg = 1; per = np->minsync;}
                if (per < tp->minsync)
                        {chg = 1; per = tp->minsync;}
                if (ofs > tp->maxoffs)
                        {chg = 1; ofs = tp->maxoffs;}

                /*
                **      Check against controller limits.
                */
                fak     = 7;
                scntl3  = 0;
                if (ofs != 0) {
                        ncr_getsync(np, per, &fak, &scntl3);
                        if (fak > 7) {
                                chg = 1;
                                ofs = 0;
                        }
                }
                if (ofs == 0) {
                        fak     = 7;
                        per     = 0;
                        scntl3  = 0;
                        tp->minsync = 0;
                }

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("sync: per=%d scntl3=0x%x ofs=%d fak=%d chg=%d.\n",
                                per, scntl3, ofs, fak, chg);
                }

                if (INB (HS_PRT) == HS_NEGOTIATE) {
                        OUTB (HS_PRT, HS_BUSY);
                        switch (cp->nego_status) {

                        case NS_SYNC:
                                /*
                                **      This was an answer message
                                */
                                if (chg) {
                                        /*
                                        **      Answer wasn't acceptable.
                                        */
                                        ncr_setsync (np, cp, 0, 0xe0);
                                        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, msg_bad));
                                } else {
                                        /*
                                        **      Answer is ok.
                                        */
                                        ncr_setsync (np, cp, scntl3, (fak<<5)|ofs);
                                        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, clrack));
                                };
                                return;

                        case NS_WIDE:
                                ncr_setwide (np, cp, 0, 0);
                                break;
                        };
                };

                /*
                **      It was a request. Set value and
                **      prepare an answer message
                */

                ncr_setsync (np, cp, scntl3, (fak<<5)|ofs);

                np->msgout[0] = M_EXTENDED;
                np->msgout[1] = 3;
                np->msgout[2] = M_X_SYNC_REQ;
                np->msgout[3] = per;
                np->msgout[4] = ofs;

                cp->nego_status = NS_SYNC;

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("sync msgout: ");
                        (void) ncr_show_msg (np->msgout);
                        printk (".\n");
                }

                if (!ofs) {
                        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, msg_bad));
                        return;
                }
                np->msgin [0] = M_NOOP;

                break;

        case SIR_NEGO_WIDE:
                /*
                **      Wide request message received.
                */
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("wide msgin: ");
                        (void) ncr_show_msg (np->msgin);
                        printk (".\n");
                };

                /*
                **      get requested values.
                */

                chg  = 0;
                wide = np->msgin[3];

                /*
                **      if target sends WDTR message,
                **            it CAN transfer wide.
                */

                if (wide)
                        tp->inq_byte7 |= INQ7_WIDE16;

                /*
                **      check values against driver limits.
                */

                if (wide > tp->usrwide)
                        {chg = 1; wide = tp->usrwide;}

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("wide: wide=%d chg=%d.\n", wide, chg);
                }

                if (INB (HS_PRT) == HS_NEGOTIATE) {
                        OUTB (HS_PRT, HS_BUSY);
                        switch (cp->nego_status) {

                        case NS_WIDE:
                                /*
                                **      This was an answer message
                                */
                                if (chg) {
                                        /*
                                        **      Answer wasn't acceptable.
                                        */
                                        ncr_setwide (np, cp, 0, 1);
                                        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, msg_bad));
                                } else {
                                        /*
                                        **      Answer is ok.
                                        */
                                        ncr_setwide (np, cp, wide, 1);
                                        OUTL (nc_dsp, NCB_SCRIPT_PHYS (np, clrack));
                                };
                                return;

                        case NS_SYNC:
                                ncr_setsync (np, cp, 0, 0xe0);
                                break;
                        };
                };

                /*
                **      It was a request, set value and
                **      prepare an answer message
                */

                ncr_setwide (np, cp, wide, 1);

                np->msgout[0] = M_EXTENDED;
                np->msgout[1] = 2;
                np->msgout[2] = M_X_WIDE_REQ;
                np->msgout[3] = wide;

                np->msgin [0] = M_NOOP;

                cp->nego_status = NS_WIDE;

                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        PRINT_ADDR(cp->cmd);
                        printk ("wide msgout: ");
                        (void) ncr_show_msg (np->msgin);
                        printk (".\n");
                }
                break;

/*--------------------------------------------------------------------
**
**      Processing of special messages
**
**--------------------------------------------------------------------
*/

        case SIR_REJECT_RECEIVED:
                /*-----------------------------------------------
                **
                **      We received a M_REJECT message.
                **
                **-----------------------------------------------
                */

                PRINT_ADDR(cp->cmd);
                printk ("M_REJECT received (%x:%x).\n",
                        (unsigned)scr_to_cpu(np->lastmsg), np->msgout[0]);
                break;

        case SIR_REJECT_SENT:
                /*-----------------------------------------------
                **
                **      We received an unknown message
                **
                **-----------------------------------------------
                */

                PRINT_ADDR(cp->cmd);
                printk ("M_REJECT sent for ");
                (void) ncr_show_msg (np->msgin);
                printk (".\n");
                break;

/*--------------------------------------------------------------------
**
**      Processing of special messages
**
**--------------------------------------------------------------------
*/

        case SIR_IGN_RESIDUE:
                /*-----------------------------------------------
                **
                **      We received an IGNORE RESIDUE message,
                **      which couldn't be handled by the script.
                **
                **-----------------------------------------------
                */

                PRINT_ADDR(cp->cmd);
                printk ("M_IGN_RESIDUE received, but not yet implemented.\n");
                break;
#if 0
        case SIR_MISSING_SAVE:
                /*-----------------------------------------------
                **
                **      We received an DISCONNECT message,
                **      but the datapointer wasn't saved before.
                **
                **-----------------------------------------------
                */

                PRINT_ADDR(cp->cmd);
                printk ("M_DISCONNECT received, but datapointer not saved: "
                        "data=%x save=%x goal=%x.\n",
                        (unsigned) INL (nc_temp),
                        (unsigned) scr_to_cpu(np->header.savep),
                        (unsigned) scr_to_cpu(np->header.goalp));
                break;
#endif
        };

out:
        OUTONB (nc_dcntl, (STD|NOCOM));
}

/*==========================================================
**
**
**      Aquire a control block
**
**
**==========================================================
*/

static  ccb_p ncr_get_ccb (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = tp->lp[ln];
        u_char tag = NO_TAG;
        ccb_p cp = (ccb_p) 0;

        /*
        **      Lun structure available ?
        */
        if (lp) {
                XPT_QUEHEAD *qp;
                /*
                **      Keep from using more tags than we can handle.
                */
                if (lp->usetags && lp->busyccbs >= lp->maxnxs)
                        return (ccb_p) 0;

                /*
                **      Allocate a new CCB if needed.
                */
                if (xpt_que_empty(&lp->free_ccbq))
                        ncr_alloc_ccb(np, tn, ln);

                /*
                **      Tune tag mode if asked by user.
                */
                if (lp->queuedepth != lp->numtags) {
                        ncr_setup_tags(np, tn, ln);
                }
                        
                /*
                **      Look for free CCB
                */
                qp = xpt_remque_head(&lp->free_ccbq);
                if (qp) {
                        cp = xpt_que_entry(qp, struct ccb, link_ccbq);
                        if (cp->magic) {
                                PRINT_LUN(np, tn, ln);
                                printk ("ccb free list corrupted (@%p)\n", cp);
                                cp = 0;
                        }
                        else {
                                xpt_insque_tail(qp, &lp->wait_ccbq);
                                ++lp->busyccbs;
                        }
                }

                /*
                **      If a CCB is available,
                **      Get a tag for this nexus if required.
                */
                if (cp) {
                        if (lp->usetags)
                                tag = lp->cb_tags[lp->ia_tag];
                }
                else if (lp->actccbs > 0)
                        return (ccb_p) 0;
        }

        /*
        **      if nothing available, take the default.
        */
        if (!cp)
                cp = np->ccb;

        /*
        **      Wait until available.
        */
#if 0
        while (cp->magic) {
                if (flags & SCSI_NOSLEEP) break;
                if (tsleep ((caddr_t)cp, PRIBIO|PCATCH, "ncr", 0))
                        break;
        };
#endif

        if (cp->magic)
                return ((ccb_p) 0);

        cp->magic = 1;

        /*
        **      Move to next available tag if tag used.
        */
        if (lp) {
                if (tag != NO_TAG) {
                        ++lp->ia_tag;
                        if (lp->ia_tag == SCSI_NCR_MAX_TAGS)
                                lp->ia_tag = 0;
                        lp->tags_umap |= (((tagmap_t) 1) << tag);
                }
        }

        /*
        **      Remember all informations needed to free this CCB.
        */
        cp->tag    = tag;
        cp->target = tn;
        cp->lun    = ln;

        if (DEBUG_FLAGS & DEBUG_TAGS) {
                PRINT_LUN(np, tn, ln);
                printk ("ccb @%p using tag %d.\n", cp, tag);
        }

        return cp;
}

/*==========================================================
**
**
**      Release one control block
**
**
**==========================================================
*/

static void ncr_free_ccb (ncb_p np, ccb_p cp)
{
        tcb_p tp = &np->target[cp->target];
        lcb_p lp = tp->lp[cp->lun];

        if (DEBUG_FLAGS & DEBUG_TAGS) {
                PRINT_LUN(np, cp->target, cp->lun);
                printk ("ccb @%p freeing tag %d.\n", cp, cp->tag);
        }

        /*
        **      If lun control block available,
        **      decrement active commands and increment credit, 
        **      free the tag if any and remove the JUMP for reselect.
        */
        if (lp) {
                if (cp->tag != NO_TAG) {
                        lp->cb_tags[lp->if_tag++] = cp->tag;
                        if (lp->if_tag == SCSI_NCR_MAX_TAGS)
                                lp->if_tag = 0;
                        lp->tags_umap &= ~(((tagmap_t) 1) << cp->tag);
                        lp->tags_smap &= lp->tags_umap;
                        lp->jump_ccb[cp->tag] =
                                cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l_q));
                } else {
                        lp->jump_ccb[0] =
                                cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l));
                }
        }

        /*
        **      Make this CCB available.
        */

        if (lp) {
                if (cp != np->ccb) {
                        xpt_remque(&cp->link_ccbq);
                        xpt_insque_head(&cp->link_ccbq, &lp->free_ccbq);
                }
                --lp->busyccbs;
                if (cp->queued) {
                        --lp->queuedccbs;
                }
        }
        cp -> host_status = HS_IDLE;
        cp -> magic = 0;
        if (cp->queued) {
                --np->queuedccbs;
                cp->queued = 0;
        }

#if 0
        if (cp == np->ccb)
                wakeup ((caddr_t) cp);
#endif
}


#define ncr_reg_bus_addr(r) \
        (bus_dvma_to_mem(np->paddr) + offsetof (struct ncr_reg, r))

/*------------------------------------------------------------------------
**      Initialize the fixed part of a CCB structure.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static void ncr_init_ccb(ncb_p np, ccb_p cp)
{
        ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);

        /*
        **      Remember virtual and bus address of this ccb.
        */
        cp->p_ccb          = vtophys(cp);
        cp->phys.header.cp = cp;

        /*
        **      This allows xpt_remque to work for the default ccb.
        */
        xpt_que_init(&cp->link_ccbq);

        /*
        **      Initialyze the start and restart launch script.
        **
        **      COPY(4) @(...p_phys), @(dsa)
        **      JUMP @(sched_point)
        */
        cp->start.setup_dsa[0]   = cpu_to_scr(copy_4);
        cp->start.setup_dsa[1]   = cpu_to_scr(vtophys(&cp->start.p_phys));
        cp->start.setup_dsa[2]   = cpu_to_scr(ncr_reg_bus_addr(nc_dsa));
        cp->start.schedule.l_cmd = cpu_to_scr(SCR_JUMP);
        cp->start.p_phys         = cpu_to_scr(vtophys(&cp->phys));

        bcopy(&cp->start, &cp->restart, sizeof(cp->restart));

        cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
}


/*------------------------------------------------------------------------
**      Allocate a CCB and initialize its fixed part.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static void ncr_alloc_ccb(ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = tp->lp[ln];
        ccb_p cp = 0;

        /*
        **      Allocate memory for this CCB.
        */
        cp = m_alloc(sizeof(struct ccb), 5);
        if (!cp)
                return;

        if (DEBUG_FLAGS & DEBUG_ALLOC) {
                PRINT_LUN(np, tn, ln);
                printk ("new ccb @%p.\n", cp);
        }

        /*
        **      Count it and initialyze it.
        */
        lp->actccbs++;
        np->actccbs++;
        bzero (cp, sizeof (*cp));
        ncr_init_ccb(np, cp);

        /*
        **      Chain into wakeup list and free ccb queue and take it 
        **      into account for tagged commands.
        */
        cp->link_ccb      = np->ccb->link_ccb;
        np->ccb->link_ccb = cp;

        xpt_insque_head(&cp->link_ccbq, &lp->free_ccbq);
        ncr_setup_tags (np, tn, ln);
}

/*==========================================================
**
**
**      Allocation of resources for Targets/Luns/Tags.
**
**
**==========================================================
*/


/*------------------------------------------------------------------------
**      Target control block initialisation.
**------------------------------------------------------------------------
**      This data structure is fully initialized after a SCSI command 
**      has been successfully completed for this target.
**      It contains a SCRIPT that is called on target reselection.
**------------------------------------------------------------------------
*/
static void ncr_init_tcb (ncb_p np, u_char tn)
{
        tcb_p tp = &np->target[tn];
        ncrcmd copy_1 = np->features & FE_PFEN ? SCR_COPY(1) : SCR_COPY_F(1);
        int th = tn & 3;
        int i;

        /*
        **      Jump to next tcb if SFBR does not match this target.
        **      JUMP  IF (SFBR != #target#), @(next tcb)
        */
        tp->jump_tcb.l_cmd   =
                cpu_to_scr((SCR_JUMP ^ IFFALSE (DATA (0x80 + tn))));
        tp->jump_tcb.l_paddr = np->jump_tcb[th].l_paddr;

        /*
        **      Load the synchronous transfer register.
        **      COPY @(tp->sval), @(sxfer)
        */
        tp->getscr[0] = cpu_to_scr(copy_1);
        tp->getscr[1] = cpu_to_scr(vtophys (&tp->sval));
        tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer));
  
        /*
        **      Load the timing register.
        **      COPY @(tp->wval), @(scntl3)
        */
        tp->getscr[3] = cpu_to_scr(copy_1);
        tp->getscr[4] = cpu_to_scr(vtophys (&tp->wval));
        tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3));

        /*
        **      Get the IDENTIFY message and the lun.
        **      CALL @script(resel_lun)
        */
        tp->call_lun.l_cmd   = cpu_to_scr(SCR_CALL);
        tp->call_lun.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_lun));

        /*
        **      Look for the lun control block of this nexus.
        **      For i = 0 to 3
        **              JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
        */
        for (i = 0 ; i < 4 ; i++) {
                tp->jump_lcb[i].l_cmd   =
                                cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
                tp->jump_lcb[i].l_paddr =
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_identify));
        }

        /*
        **      Link this target control block to the JUMP chain.
        */
        np->jump_tcb[th].l_paddr = cpu_to_scr(vtophys (&tp->jump_tcb));

        /*
        **      These assert's should be moved at driver initialisations.
        */
        assert (( (offsetof(struct ncr_reg, nc_sxfer) ^
                offsetof(struct tcb    , sval    )) &3) == 0);
        assert (( (offsetof(struct ncr_reg, nc_scntl3) ^
                offsetof(struct tcb    , wval    )) &3) == 0);
}


/*------------------------------------------------------------------------
**      Lun control block allocation and initialization.
**------------------------------------------------------------------------
**      This data structure is allocated and initialized after a SCSI 
**      command has been successfully completed for this target/lun.
**------------------------------------------------------------------------
*/
static lcb_p ncr_alloc_lcb (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = tp->lp[ln];
        ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
        int lh = ln & 3;

        /*
        **      Already done, return.
        */
        if (lp)
                return lp;

        /*
        **      Allocate the lcb.
        */
        lp = m_alloc(sizeof(struct lcb), 3);
        if (!lp)
                goto fail;
        bzero(lp, sizeof(*lp));
        tp->lp[ln] = lp;

        if (DEBUG_FLAGS & DEBUG_ALLOC) {
                PRINT_LUN(np, tn, ln);
                printk ("new lcb @%p.\n", lp);
        }

        /*
        **      Initialize the target control block if not yet.
        */
        if (!tp->jump_tcb.l_cmd)
                ncr_init_tcb(np, tn);

        /*
        **      Initialize the CCB queue headers.
        */
        xpt_que_init(&lp->free_ccbq);
        xpt_que_init(&lp->busy_ccbq);
        xpt_que_init(&lp->wait_ccbq);
        xpt_que_init(&lp->skip_ccbq);

        /*
        **      Set max CCBs to 1 and use the default 1 entry 
        **      jump table by default.
        */
        lp->maxnxs      = 1;
        lp->jump_ccb    = &lp->jump_ccb_0;
        lp->p_jump_ccb  = cpu_to_scr(vtophys(lp->jump_ccb));

        /*
        **      Initilialyze the reselect script:
        **
        **      Jump to next lcb if SFBR does not match this lun.
        **      Load TEMP with the CCB direct jump table bus address.
        **      Get the SIMPLE TAG message and the tag.
        **
        **      JUMP  IF (SFBR != #lun#), @(next lcb)
        **      COPY @(lp->p_jump_ccb),   @(temp)
        **      JUMP @script(resel_notag)
        */
        lp->jump_lcb.l_cmd   =
                cpu_to_scr((SCR_JUMP ^ IFFALSE (MASK (0x80+ln, 0xff))));
        lp->jump_lcb.l_paddr = tp->jump_lcb[lh].l_paddr;

        lp->load_jump_ccb[0] = cpu_to_scr(copy_4);
        lp->load_jump_ccb[1] = cpu_to_scr(vtophys (&lp->p_jump_ccb));
        lp->load_jump_ccb[2] = cpu_to_scr(ncr_reg_bus_addr(nc_temp));

        lp->jump_tag.l_cmd   = cpu_to_scr(SCR_JUMP);
        lp->jump_tag.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_notag));

        /*
        **      Link this lun control block to the JUMP chain.
        */
        tp->jump_lcb[lh].l_paddr = cpu_to_scr(vtophys (&lp->jump_lcb));

        /*
        **      Initialize command queuing control.
        */
        lp->busyccbs    = 1;
        lp->queuedccbs  = 1;
        lp->queuedepth  = 1;
fail:
        return lp;
}


/*------------------------------------------------------------------------
**      Lun control block setup on INQUIRY data received.
**------------------------------------------------------------------------
**      We only support WIDE, SYNC for targets and CMDQ for logical units.
**      This setup is done on each INQUIRY since we are expecting user 
**      will play with CHANGE DEFINITION commands. :-)
**------------------------------------------------------------------------
*/
static lcb_p ncr_setup_lcb (ncb_p np, u_char tn, u_char ln, u_char *inq_data)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = tp->lp[ln];
        u_char inq_byte7;

        /*
        **      If no lcb, try to allocate it.
        */
        if (!lp && !(lp = ncr_alloc_lcb(np, tn, ln)))
                goto fail;

        /*
        **      Get device quirks from a speciality table.
        */
        tp->quirks = ncr_lookup (inq_data);
        if (tp->quirks && bootverbose) {
                PRINT_LUN(np, tn, ln);
                printk ("quirks=%x.\n", tp->quirks);
        }

        /*
        **      Evaluate trustable target/unit capabilities.
        **      We only believe device version >= SCSI-2 that 
        **      use appropriate response data format (2).
        **      But it seems that some CCS devices also 
        **      support SYNC and I donnot want to frustrate 
        **      anybody. ;-)
        */
        inq_byte7 = 0;
        if      ((inq_data[2] & 0x7) >= 2 && (inq_data[3] & 0xf) == 2)
                inq_byte7 = inq_data[7];
        else if ((inq_data[2] & 0x7) == 1 && (inq_data[3] & 0xf) == 1)
                inq_byte7 = INQ7_SYNC;

        /*
        **      Throw away announced LUN capabilities if we are told 
        **      that there is no real device supported by the logical unit.
        */
        if ((inq_data[0] & 0xe0) > 0x20 || (inq_data[0] & 0x1f) == 0x1f)
                inq_byte7 &= (INQ7_SYNC | INQ7_WIDE16);

        /*
        **      If user is wanting SYNC, force this feature.
        */
        if (driver_setup.force_sync_nego)
                inq_byte7 |= INQ7_SYNC;

        /*
        **      Prepare negotiation if SIP capabilities have changed.
        */
        tp->inq_done = 1;
        if ((inq_byte7 ^ tp->inq_byte7) & (INQ7_SYNC | INQ7_WIDE16)) {
                tp->inq_byte7 = inq_byte7;
                ncr_negotiate(np, tp);
        }

        /*
        **      If unit supports tagged commands, allocate the 
        **      CCB JUMP table if not yet.
        */
        if ((inq_byte7 & INQ7_QUEUE) && lp->jump_ccb == &lp->jump_ccb_0) {
                int i;
                lp->jump_ccb = m_alloc(256, 8);
                if (!lp->jump_ccb) {
                        lp->jump_ccb = &lp->jump_ccb_0;
                        goto fail;
                }
                lp->p_jump_ccb = cpu_to_scr(vtophys(lp->jump_ccb));
                for (i = 0 ; i < 64 ; i++)
                        lp->jump_ccb[i] =
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l_q));
                for (i = 0 ; i < SCSI_NCR_MAX_TAGS ; i++)
                        lp->cb_tags[i] = i;
                lp->maxnxs = SCSI_NCR_MAX_TAGS;
                lp->tags_stime = jiffies;
        }

        /*
        **      Adjust tagged queueing status if needed.
        */
        if ((inq_byte7 ^ lp->inq_byte7) & INQ7_QUEUE) {
                lp->inq_byte7 = inq_byte7;
                lp->numtags   = lp->maxtags;
                ncr_setup_tags (np, tn, ln);
        }

fail:
        return lp;
}

/*==========================================================
**
**
**      Build Scatter Gather Block
**
**
**==========================================================
**
**      The transfer area may be scattered among
**      several non adjacent physical pages.
**
**      We may use MAX_SCATTER blocks.
**
**----------------------------------------------------------
*/

/*
**      We try to reduce the number of interrupts caused
**      by unexpected phase changes due to disconnects.
**      A typical harddisk may disconnect before ANY block.
**      If we wanted to avoid unexpected phase changes at all
**      we had to use a break point every 512 bytes.
**      Of course the number of scatter/gather blocks is
**      limited.
**      Under Linux, the scatter/gatter blocks are provided by 
**      the generic driver. We just have to copy addresses and 
**      sizes to the data segment array.
*/

static  int     ncr_scatter(ccb_p cp, Scsi_Cmnd *cmd)
{
        struct scr_tblmove *data;
        int segment     = 0;
        int use_sg      = (int) cmd->use_sg;

        data            = cp->phys.data;
        cp->data_len    = 0;

        if (!use_sg) {
                if (cmd->request_bufflen) {
                        data = &data[MAX_SCATTER - 1];
                        data[0].addr = cpu_to_scr(vtophys(cmd->request_buffer));
                        data[0].size = cpu_to_scr(cmd->request_bufflen);
                        cp->data_len = cmd->request_bufflen;
                        segment = 1;
                }
        }
        else if (use_sg <= MAX_SCATTER) {
                struct scatterlist *scatter = (struct scatterlist *)cmd->buffer;

                data = &data[MAX_SCATTER - use_sg];
                while (segment < use_sg) {
                        data[segment].addr =
                                cpu_to_scr(vtophys(scatter[segment].address));
                        data[segment].size =
                                cpu_to_scr(scatter[segment].length);
                        cp->data_len       += scatter[segment].length;
                        ++segment;
                }
        }
        else {
                return -1;
        }

        return segment;
}

/*==========================================================
**
**
**      Test the pci bus snoop logic :-(
**
**      Has to be called with interrupts disabled.
**
**
**==========================================================
*/

#ifndef NCR_IOMAPPED
static int __init ncr_regtest (struct ncb* np)
{
        register volatile u_int32 data;
        /*
        **      ncr registers may NOT be cached.
        **      write 0xffffffff to a read only register area,
        **      and try to read it back.
        */
        data = 0xffffffff;
        OUTL_OFF(offsetof(struct ncr_reg, nc_dstat), data);
        data = INL_OFF(offsetof(struct ncr_reg, nc_dstat));
#if 1
        if (data == 0xffffffff) {
#else
        if ((data & 0xe2f0fffd) != 0x02000080) {
#endif
                printk ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
                        (unsigned) data);
                return (0x10);
        };
        return (0);
}
#endif

static int __init ncr_snooptest (struct ncb* np)
{
        u_int32 ncr_rd, ncr_wr, ncr_bk, host_rd, host_wr, pc;
        int     i, err=0;
#ifndef NCR_IOMAPPED
        if (np->reg) {
            err |= ncr_regtest (np);
            if (err) return (err);
        }
#endif
        /*
        **      init
        */
        pc  = NCB_SCRIPTH_PHYS (np, snooptest);
        host_wr = 1;
        ncr_wr  = 2;
        /*
        **      Set memory and register.
        */
        np->ncr_cache = cpu_to_scr(host_wr);
        OUTL (nc_temp, ncr_wr);
        /*
        **      Start script (exchange values)
        */
        OUTL (nc_dsp, pc);
        /*
        **      Wait 'til done (with timeout)
        */
        for (i=0; i<NCR_SNOOP_TIMEOUT; i++)
                if (INB(nc_istat) & (INTF|SIP|DIP))
                        break;
        /*
        **      Save termination position.
        */
        pc = INL (nc_dsp);
        /*
        **      Read memory and register.
        */
        host_rd = scr_to_cpu(np->ncr_cache);
        ncr_rd  = INL (nc_scratcha);
        ncr_bk  = INL (nc_temp);
        /*
        **      Reset ncr chip
        */
        OUTB (nc_istat,  SRST);
        UDELAY (100);
        OUTB (nc_istat,  0   );
        /*
        **      check for timeout
        */
        if (i>=NCR_SNOOP_TIMEOUT) {
                printk ("CACHE TEST FAILED: timeout.\n");
                return (0x20);
        };
        /*
        **      Check termination position.
        */
        if (pc != NCB_SCRIPTH_PHYS (np, snoopend)+8) {
                printk ("CACHE TEST FAILED: script execution failed.\n");
                printk ("start=%08lx, pc=%08lx, end=%08lx\n", 
                        (u_long) NCB_SCRIPTH_PHYS (np, snooptest), (u_long) pc,
                        (u_long) NCB_SCRIPTH_PHYS (np, snoopend) +8);
                return (0x40);
        };
        /*
        **      Show results.
        */
        if (host_wr != ncr_rd) {
                printk ("CACHE TEST FAILED: host wrote %d, ncr read %d.\n",
                        (int) host_wr, (int) ncr_rd);
                err |= 1;
        };
        if (host_rd != ncr_wr) {
                printk ("CACHE TEST FAILED: ncr wrote %d, host read %d.\n",
                        (int) ncr_wr, (int) host_rd);
                err |= 2;
        };
        if (ncr_bk != ncr_wr) {
                printk ("CACHE TEST FAILED: ncr wrote %d, read back %d.\n",
                        (int) ncr_wr, (int) ncr_bk);
                err |= 4;
        };
        return (err);
}

/*==========================================================
**
**
**      Profiling the drivers and targets performance.
**
**
**==========================================================
*/

#ifdef SCSI_NCR_PROFILE_SUPPORT

/*
**      Compute the difference in jiffies ticks.
*/

#define ncr_delta(from, to) \
        ( ((to) && (from))? (to) - (from) : -1 )

#define PROFILE  cp->phys.header.stamp
static  void ncb_profile (ncb_p np, ccb_p cp)
{
        long co, st, en, di, re, post, work, disc;
        u_int diff;

        PROFILE.end = jiffies;

        st = ncr_delta (PROFILE.start,PROFILE.status);
        if (st<0) return;       /* status  not reached  */

        co = ncr_delta (PROFILE.start,PROFILE.command);
        if (co<0) return;       /* command not executed */

        en = ncr_delta (PROFILE.start,PROFILE.end),
        di = ncr_delta (PROFILE.start,PROFILE.disconnect),
        re = ncr_delta (PROFILE.start,PROFILE.reselect);
        post = en - st;

        /*
        **      @PROFILE@  Disconnect time invalid if multiple disconnects
        */

        if (di>=0) disc = re - di; else  disc = 0;

        work = (st - co) - disc;

        diff = (scr_to_cpu(np->disc_phys) - np->disc_ref) & 0xff;
        np->disc_ref += diff;

        np->profile.num_trans   += 1;
        if (cp->cmd) {
                np->profile.num_kbytes  += (cp->cmd->request_bufflen >> 10);
                np->profile.rest_bytes  += (cp->cmd->request_bufflen & (0x400-1));
                if (np->profile.rest_bytes >= 0x400) {
                        ++np->profile.num_kbytes;
                        np->profile.rest_bytes  -= 0x400;
                }
        }
        np->profile.num_disc    += diff;
        np->profile.ms_setup    += co;
        np->profile.ms_data     += work;
        np->profile.ms_disc     += disc;
        np->profile.ms_post     += post;
}
#undef PROFILE

#endif /* SCSI_NCR_PROFILE_SUPPORT */

/*==========================================================
**
**
**      Device lookup.
**
**      @GENSCSI@ should be integrated to scsiconf.c
**
**
**==========================================================
*/

struct table_entry {
        char *  manufacturer;
        char *  model;
        char *  version;
        u_long  info;
};

static struct table_entry device_tab[] =
{
#if 0
        {"", "", "", QUIRK_NOMSG},
#endif
        {"SONY", "SDT-5000", "3.17", QUIRK_NOMSG},
        {"WangDAT", "Model 2600", "01.7", QUIRK_NOMSG},
        {"WangDAT", "Model 3200", "02.2", QUIRK_NOMSG},
        {"WangDAT", "Model 1300", "02.4", QUIRK_NOMSG},
        {"", "", "", 0} /* catch all: must be last entry. */
};

static u_long ncr_lookup(char * id)
{
        struct table_entry * p = device_tab;
        char *d, *r, c;

        for (;;p++) {

                d = id+8;
                r = p->manufacturer;
                while ((c=*r++)) if (c!=*d++) break;
                if (c) continue;

                d = id+16;
                r = p->model;
                while ((c=*r++)) if (c!=*d++) break;
                if (c) continue;

                d = id+32;
                r = p->version;
                while ((c=*r++)) if (c!=*d++) break;
                if (c) continue;

                return (p->info);
        }
}

/*==========================================================
**
**      Determine the ncr's clock frequency.
**      This is essential for the negotiation
**      of the synchronous transfer rate.
**
**==========================================================
**
**      Note: we have to return the correct value.
**      THERE IS NO SAVE DEFAULT VALUE.
**
**      Most NCR/SYMBIOS boards are delivered with a 40 Mhz clock.
**      53C860 and 53C875 rev. 1 support fast20 transfers but 
**      do not have a clock doubler and so are provided with a 
**      80 MHz clock. All other fast20 boards incorporate a doubler 
**      and so should be delivered with a 40 MHz clock.
**      The future fast40 chips (895/895) use a 40 Mhz base clock 
**      and provide a clock quadrupler (160 Mhz). The code below 
**      tries to deal as cleverly as possible with all this stuff.
**
**----------------------------------------------------------
*/

/*
 *      Select NCR SCSI clock frequency
 */
static void ncr_selectclock(ncb_p np, u_char scntl3)
{
        if (np->multiplier < 2) {
                OUTB(nc_scntl3, scntl3);
                return;
        }

        if (bootverbose >= 2)
                printk ("%s: enabling clock multiplier\n", ncr_name(np));

        OUTB(nc_stest1, DBLEN);    /* Enable clock multiplier             */
        if (np->multiplier > 2) {  /* Poll bit 5 of stest4 for quadrupler */
                int i = 20;
                while (!(INB(nc_stest4) & LCKFRQ) && --i > 0)
                        UDELAY (20);
                if (!i)
                        printk("%s: the chip cannot lock the frequency\n", ncr_name(np));
        } else                  /* Wait 20 micro-seconds for doubler    */
                UDELAY (20);
        OUTB(nc_stest3, HSC);           /* Halt the scsi clock          */
        OUTB(nc_scntl3, scntl3);
        OUTB(nc_stest1, (DBLEN|DBLSEL));/* Select clock multiplier      */
        OUTB(nc_stest3, 0x00);          /* Restart scsi clock           */
}


/*
 *      calculate NCR SCSI clock frequency (in KHz)
 */
static unsigned __init ncrgetfreq (ncb_p np, int gen)
{
        unsigned ms = 0;

        /*
         * Measure GEN timer delay in order 
         * to calculate SCSI clock frequency
         *
         * This code will never execute too
         * many loop iterations (if DELAY is 
         * reasonably correct). It could get
         * too low a delay (too high a freq.)
         * if the CPU is slow executing the 
         * loop for some reason (an NMI, for
         * example). For this reason we will
         * if multiple measurements are to be 
         * performed trust the higher delay 
         * (lower frequency returned).
         */
        OUTB (nc_stest1, 0);    /* make sure clock doubler is OFF */
        OUTW (nc_sien , 0);     /* mask all scsi interrupts */
        (void) INW (nc_sist);   /* clear pending scsi interrupt */
        OUTB (nc_dien , 0);     /* mask all dma interrupts */
        (void) INW (nc_sist);   /* another one, just to be sure :) */
        OUTB (nc_scntl3, 4);    /* set pre-scaler to divide by 3 */
        OUTB (nc_stime1, 0);    /* disable general purpose timer */
        OUTB (nc_stime1, gen);  /* set to nominal delay of 1<<gen * 125us */
        while (!(INW(nc_sist) & GEN) && ms++ < 100000)
                UDELAY (1000);  /* count ms */
        OUTB (nc_stime1, 0);    /* disable general purpose timer */
        /*
         * set prescaler to divide by whatever 0 means
         * 0 ought to choose divide by 2, but appears
         * to set divide by 3.5 mode in my 53c810 ...
         */
        OUTB (nc_scntl3, 0);

        if (bootverbose >= 2)
                printk ("%s: Delay (GEN=%d): %u msec\n", ncr_name(np), gen, ms);
        /*
         * adjust for prescaler, and convert into KHz 
         */
        return ms ? ((1 << gen) * 4340) / ms : 0;
}

/*
 *      Get/probe NCR SCSI clock frequency
 */
static void __init ncr_getclock (ncb_p np, int mult)
{
        unsigned char scntl3 = INB(nc_scntl3);
        unsigned char stest1 = INB(nc_stest1);
        unsigned f1;

        np->multiplier = 1;
        f1 = 40000;

        /*
        **      True with 875 or 895 with clock multiplier selected
        */
        if (mult > 1 && (stest1 & (DBLEN+DBLSEL)) == DBLEN+DBLSEL) {
                if (bootverbose >= 2)
                        printk ("%s: clock multiplier found\n", ncr_name(np));
                np->multiplier = mult;
        }

        /*
        **      If multiplier not found or scntl3 not 7,5,3,
        **      reset chip and get frequency from general purpose timer.
        **      Otherwise trust scntl3 BIOS setting.
        */
        if (np->multiplier != mult || (scntl3 & 7) < 3 || !(scntl3 & 1)) {
                unsigned f2;

                OUTB(nc_istat, SRST); UDELAY (5); OUTB(nc_istat, 0);

                (void) ncrgetfreq (np, 11);     /* throw away first result */
                f1 = ncrgetfreq (np, 11);
                f2 = ncrgetfreq (np, 11);

                if (bootverbose)
                        printk ("%s: NCR clock is %uKHz, %uKHz\n", ncr_name(np), f1, f2);

                if (f1 > f2) f1 = f2;           /* trust lower result   */

                if      (f1 <   45000)          f1 =  40000;
                else if (f1 <   55000)          f1 =  50000;
                else                            f1 =  80000;

                if (f1 < 80000 && mult > 1) {
                        if (bootverbose >= 2)
                                printk ("%s: clock multiplier assumed\n", ncr_name(np));
                        np->multiplier  = mult;
                }
        } else {
                if      ((scntl3 & 7) == 3)     f1 =  40000;
                else if ((scntl3 & 7) == 5)     f1 =  80000;
                else                            f1 = 160000;

                f1 /= np->multiplier;
        }

        /*
        **      Compute controller synchronous parameters.
        */
        f1              *= np->multiplier;
        np->clock_khz   = f1;
}

/*===================== LINUX ENTRY POINTS SECTION ==========================*/

#ifndef uchar
#define uchar unsigned char
#endif

#ifndef ushort
#define ushort unsigned short
#endif

#ifndef ulong
#define ulong unsigned long
#endif

/* ---------------------------------------------------------------------
**
**      Driver setup from the boot command line
**
** ---------------------------------------------------------------------
*/

#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif


void __init ncr53c8xx_setup(char *str, int *ints)
{
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
        char *cur = str;
        char *pc, *pv;
        int val;
        int base;
        int c;
        int xi = 0;

        while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
                char *pe;

                val = 0;
                pv = pc;
                c = *++pv;

                if      (c == 'n')
                        val = 0;
                else if (c == 'y')
                        val = 1;
                else {
                        base = 0;
                        val = (int) simple_strtoul(pv, &pe, base);
                }
                if      (!strncmp(cur, "tags:", 5)) {
                        int i;
                        driver_setup.default_tags = val;
                        if (pe && *pe == '/') {
                                i = 0;
                                while (*pe && *pe != ARG_SEP && 
                                        i < sizeof(driver_setup.tag_ctrl)-1) {
                                        driver_setup.tag_ctrl[i++] = *pe++;
                                }
                                driver_setup.tag_ctrl[i] = '\0';
                        }
                }
                else if (!strncmp(cur, "mpar:", 5))
                        driver_setup.master_parity      = val;
                else if (!strncmp(cur, "spar:", 5))
                        driver_setup.scsi_parity        = val;
                else if (!strncmp(cur, "disc:", 5))
                        driver_setup.disconnection      = val;
                else if (!strncmp(cur, "specf:", 6))
                        driver_setup.special_features = val;
                else if (!strncmp(cur, "ultra:", 6))
                        driver_setup.ultra_scsi = val;
                else if (!strncmp(cur, "fsn:", 4))
                        driver_setup.force_sync_nego    = val;
                else if (!strncmp(cur, "revprob:", 8))
                        driver_setup.reverse_probe      = val;
                else if (!strncmp(cur, "sync:", 5))
                        driver_setup.default_sync       = val;
                else if (!strncmp(cur, "verb:", 5))
                        driver_setup.verbose    = val;
                else if (!strncmp(cur, "debug:", 6))
                        driver_setup.debug      = val;
                else if (!strncmp(cur, "burst:", 6))
                        driver_setup.burst_max  = val;
                else if (!strncmp(cur, "led:", 4))
                        driver_setup.led_pin    = val;
                else if (!strncmp(cur, "wide:", 5))
                        driver_setup.max_wide   = val? 1:0;
                else if (!strncmp(cur, "settle:", 7))
                        driver_setup.settle_delay= val;
                else if (!strncmp(cur, "diff:", 5))
                        driver_setup.diff_support= val;
                else if (!strncmp(cur, "irqm:", 5))
                        driver_setup.irqm       = val;
                else if (!strncmp(cur, "pcifix:", 7))
                        driver_setup.pci_fix_up = val;
                else if (!strncmp(cur, "buschk:", 7))
                        driver_setup.bus_check  = val;
#ifdef SCSI_NCR_NVRAM_SUPPORT
                else if (!strncmp(cur, "nvram:", 6))
                        driver_setup.use_nvram  = val;
#endif

                else if (!strncmp(cur, "safe:", 5) && val)
                        memcpy(&driver_setup, &driver_safe_setup, sizeof(driver_setup));
                else if (!strncmp(cur, "excl:", 5)) {
                        if (xi < SCSI_NCR_MAX_EXCLUDES)
                                driver_setup.excludes[xi++] = val;
                }
                else
                        printk("ncr53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);

                if ((cur = strchr(cur, ARG_SEP)) != NULL)
                        ++cur;
        }
#endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
}

static int ncr53c8xx_pci_init(Scsi_Host_Template *tpnt,
             uchar bus, uchar device_fn, ncr_device *device);

/*
**   Linux entry point for NCR53C8XX devices detection routine.
**
**   Called by the middle-level scsi drivers at initialization time,
**   or at module installation.
**
**   Read the PCI configuration and try to attach each
**   detected NCR board.
**
**   If NVRAM is present, try to attach boards according to 
**   the used defined boot order.
**
**   Returns the number of boards successfully attached.
*/

static void __init ncr_print_driver_setup(void)
{
#define YesNo(y)        y ? 'y' : 'n'
        printk ("ncr53c8xx: setup=disc:%c,specf:%d,ultra:%d,tags:%d,sync:%d,"
                "burst:%d,wide:%c,diff:%d,revprob:%c,buschk:0x%x\n",
                YesNo(driver_setup.disconnection),
                driver_setup.special_features,
                driver_setup.ultra_scsi,
                driver_setup.default_tags,
                driver_setup.default_sync,
                driver_setup.burst_max,
                YesNo(driver_setup.max_wide),
                driver_setup.diff_support,
                YesNo(driver_setup.reverse_probe),
                driver_setup.bus_check);

        printk ("ncr53c8xx: setup=mpar:%c,spar:%c,fsn=%c,verb:%d,debug:0x%x,"
                "led:%c,settle:%d,irqm:%d,nvram:0x%x,pcifix:0x%x\n",
                YesNo(driver_setup.master_parity),
                YesNo(driver_setup.scsi_parity),
                YesNo(driver_setup.force_sync_nego),
                driver_setup.verbose,
                driver_setup.debug,
                YesNo(driver_setup.led_pin),
                driver_setup.settle_delay,
                driver_setup.irqm,
                driver_setup.use_nvram,
                driver_setup.pci_fix_up);
#undef YesNo
}

/*
**   NCR53C8XX devices description table and chip ids list.
*/

static ncr_chip ncr_chip_table[] __initdata     = SCSI_NCR_CHIP_TABLE;
static ushort   ncr_chip_ids[]   __initdata     = SCSI_NCR_CHIP_IDS;

#ifdef SCSI_NCR_NVRAM_SUPPORT
static int __init 
ncr_attach_using_nvram(Scsi_Host_Template *tpnt, int nvram_index, int count, ncr_device device[])
{
        int i, j;
        int attach_count = 0;
        ncr_nvram  *nvram;
        ncr_device *devp = 0;   /* to shut up gcc */

        if (!nvram_index)
                return 0;

        /* find first Symbios NVRAM if there is one as we need to check it for host boot order */
        for (i = 0, nvram_index = -1; i < count; i++) {
                devp  = &device[i];
                nvram = devp->nvram;
                if (!nvram)
                        continue;
                if (nvram->type == SCSI_NCR_SYMBIOS_NVRAM) {
                        if (nvram_index == -1)
                                nvram_index = i;
#ifdef SCSI_NCR_DEBUG_NVRAM
                        printk("ncr53c8xx: NVRAM: Symbios format Boot Block, 53c%s, PCI bus %d, device %d, function %d\n",
                                devp->chip.name, devp->slot.bus, 
                                (int) (devp->slot.device_fn & 0xf8) >> 3, 
                                (int) devp->slot.device_fn & 7);
                        for (j = 0 ; j < 4 ; j++) {
                                Symbios_host *h = &nvram->data.Symbios.host[j];
                        printk("ncr53c8xx: BOOT[%d] device_id=%04x vendor_id=%04x device_fn=%02x io_port=%04x %s\n",
                                j,              h->device_id,   h->vendor_id,
                                h->device_fn,   h->io_port,
                                (h->flags & SYMBIOS_INIT_SCAN_AT_BOOT) ? "SCAN AT BOOT" : "");
                        }
                }
                else if (nvram->type == SCSI_NCR_TEKRAM_NVRAM) {
                        /* display Tekram nvram data */
                        printk("ncr53c8xx: NVRAM: Tekram format data, 53c%s, PCI bus %d, device %d, function %d\n",
                                devp->chip.name, devp->slot.bus, 
                                (int) (devp->slot.device_fn & 0xf8) >> 3, 
                                (int) devp->slot.device_fn & 7);
#endif
                }
        }

        if (nvram_index >= 0 && nvram_index < count)
                nvram = device[nvram_index].nvram;
        else
                nvram = 0;

        if (!nvram)
                goto out;

        /* 
        ** check devices in the boot record against devices detected. 
        ** attach devices if we find a match. boot table records that 
        ** do not match any detected devices will be ignored. 
        ** devices that do not match any boot table will not be attached
        ** here but will attempt to be attached during the device table 
        ** rescan.
        */
        for (i = 0; i < 4; i++) {
                Symbios_host *h = &nvram->data.Symbios.host[i];
                for (j = 0 ; j < count ; j++) {
                        devp = &device[j];
                        if (h->device_fn == devp->slot.device_fn &&
#if 0   /* bus number location in nvram ? */
                            h->bus       == devp->slot.bus       &&
#endif
                            h->device_id == devp->chip.device_id)
                                break;
                }
                if (j < count && !devp->attach_done) {
                        if (!ncr_attach (tpnt, attach_count, devp))
                                attach_count++;
                        devp->attach_done = 1;
                }
        }

out:
        return attach_count;
}
#endif /* SCSI_NCR_NVRAM_SUPPORT */

int __init ncr53c8xx_detect(Scsi_Host_Template *tpnt)
{
        int i, j;
        int chips;
        int count = 0;
        uchar bus, device_fn;
        short index;
        int attach_count = 0;
        ncr_device device[8];
#ifdef SCSI_NCR_NVRAM_SUPPORT
        ncr_nvram  nvram[4];
        int k, nvrams;
#endif
        int hosts;

#ifdef SCSI_NCR_NVRAM_SUPPORT
        int nvram_index = 0;
#endif

#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
        ncr_debug = driver_setup.debug;
#endif

     tpnt->proc_dir = &proc_scsi_ncr53c8xx;
#ifdef SCSI_NCR_PROC_INFO_SUPPORT
     tpnt->proc_info = ncr53c8xx_proc_info;
#endif

#if     defined(SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT) && defined(MODULE)
if (ncr53c8xx)
        ncr53c8xx_setup(ncr53c8xx, (int *) 0);
#endif

        if (initverbose >= 2)
                ncr_print_driver_setup();

        /* 
        ** Detect all 53c8xx hosts and then attach them.
        **
        ** If we are using NVRAM, once all hosts are detected, we need to check
        ** any NVRAM for boot order in case detect and boot order differ and
        ** attach them using the order in the NVRAM.
        **
        ** If no NVRAM is found or data appears invalid attach boards in the 
        ** the order they are detected.
        */

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,92)
        if (!pci_present())
#else
        if (!pcibios_present())
#endif
                return 0;

        chips   = sizeof(ncr_chip_ids)  / sizeof(ncr_chip_ids[0]);
        hosts   = sizeof(device)        / sizeof(device[0]);
#ifdef SCSI_NCR_NVRAM_SUPPORT
        k = 0;
        if (driver_setup.use_nvram & 0x1)
                nvrams  = sizeof(nvram) / sizeof(nvram[0]);
        else
                nvrams  = 0;
#endif

        for (j = 0; j < chips ; ++j) {
                i = driver_setup.reverse_probe ? chips-1 - j : j;
                for (index = 0; ; index++) {
                        char *msg = "";
                        if ((pcibios_find_device(PCI_VENDOR_ID_NCR, ncr_chip_ids[i],
                                                index, &bus, &device_fn)) ||
                            (count == hosts))
                                break;
#ifdef SCSI_NCR_NVRAM_SUPPORT
                        device[count].nvram = k < nvrams ? &nvram[k] : 0;
#else
                        device[count].nvram = 0;
#endif
                        if (ncr53c8xx_pci_init(tpnt, bus, device_fn, &device[count])) {
                                device[count].nvram = 0;
                                continue;
                        }
#ifdef SCSI_NCR_NVRAM_SUPPORT
                        if (device[count].nvram) {
                                ++k;
                                nvram_index |= device[count].nvram->type;
                                switch (device[count].nvram->type) {
                                case SCSI_NCR_TEKRAM_NVRAM:
                                        msg = "with Tekram NVRAM";
                                        break;
                                case SCSI_NCR_SYMBIOS_NVRAM:
                                        msg = "with Symbios NVRAM";
                                        break;
                                default:
                                        msg = "";
                                        device[count].nvram = 0;
                                        --k;
                                }
                        }
#endif
                        printk(KERN_INFO "ncr53c8xx: 53c%s detected %s\n",
                                device[count].chip.name, msg);
                        ++count;
                }
        }
#ifdef SCSI_NCR_NVRAM_SUPPORT
        attach_count = ncr_attach_using_nvram(tpnt, nvram_index, count, device);
#endif
        /* 
        ** rescan device list to make sure all boards attached.
        ** devices without boot records will not be attached yet
        ** so try to attach them here.
        */
        for (i= 0; i < count; i++) {
                if (!device[i].attach_done && 
                    !ncr_attach (tpnt, attach_count, &device[i])) {
                        attach_count++;
                }
        }

        return attach_count;
}

/*
**   Generically read a base address from the PCI configuration space.
**   Return the offset immediately after the base address that has 
**   been read. Btw, we blindly assume that the high 32 bits of 64 bit 
**   base addresses are set to zero on 32 bit architectures.
**   (the pci generic code now does this for us)
**
*/

static int __init 
pci_get_base_address(struct pci_dev *pdev, int index, u_long *base)
{
        *base = pdev->resource[index].start;
        if ((pdev->resource[index].flags & 0x7) == 0x4)
                ++index;
        return ++index;
}

/*
**   Read and check the PCI configuration for any detected NCR 
**   boards and save data for attaching after all boards have 
**   been detected.
*/


static int __init ncr53c8xx_pci_init(Scsi_Host_Template *tpnt,
                              uchar bus, uchar device_fn, ncr_device *device)
{
        ushort vendor_id, device_id, command;
        uchar cache_line_size, latency_timer;
        uchar revision;
#if LINUX_VERSION_CODE > LinuxVersionCode(2,1,92)
        struct pci_dev *pdev;
        uint irq;
#else
        uchar irq;
#endif
        ulong base, base_2, io_port; 
        int i;
#ifdef SCSI_NCR_NVRAM_SUPPORT
        ncr_nvram *nvram = device->nvram;
#endif
        ncr_chip *chip;

        /*
        **    Read info from the PCI config space.
        **    pcibios_read_config_xxx() functions are assumed to be used for 
        **    successfully detected PCI devices.
        */
#if LINUX_VERSION_CODE > LinuxVersionCode(2,1,92)
        pdev = pci_find_slot(bus, device_fn);
        vendor_id = pdev->vendor;
        device_id = pdev->device;
        irq = pdev->irq;
        i =     0;
        i =     pci_get_base_address(pdev, i, &io_port);
        i =     pci_get_base_address(pdev, i, &base);
        (void)  pci_get_base_address(pdev, i, &base_2);
#else
        pcibios_read_config_word(bus, device_fn, PCI_VENDOR_ID, &vendor_id);
        pcibios_read_config_word(bus, device_fn, PCI_DEVICE_ID, &device_id);
        pcibios_read_config_byte(bus, device_fn, PCI_INTERRUPT_LINE, &irq);
        i =     PCI_BASE_ADDRESS_0;
        i =     pci_read_base_address(bus, device_fn, i, &io_port);
        i =     pci_read_base_address(bus, device_fn, i, &base);
        (void)  pci_read_base_address(bus, device_fn, i, &base_2);
#endif
        pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
        pcibios_read_config_byte(bus, device_fn, PCI_CLASS_REVISION, &revision);
        pcibios_read_config_byte(bus, device_fn, PCI_CACHE_LINE_SIZE,
                                 &cache_line_size);
        pcibios_read_config_byte(bus, device_fn, PCI_LATENCY_TIMER,
                                 &latency_timer);

        /*
        **      If user excludes this chip, donnot initialize it.
        */
        for (i = 0 ; i < SCSI_NCR_MAX_EXCLUDES ; i++) {
                if (driver_setup.excludes[i] ==
                                (io_port & PCI_BASE_ADDRESS_IO_MASK))
                        return -1;
        }
        /*
         *      Check if the chip is supported
         */
        chip = 0;
        for (i = 0; i < sizeof(ncr_chip_table)/sizeof(ncr_chip_table[0]); i++) {
                if (device_id != ncr_chip_table[i].device_id)
                        continue;
                if (revision > ncr_chip_table[i].revision_id)
                        continue;
                chip = &device->chip;
                memcpy(chip, &ncr_chip_table[i], sizeof(*chip));
                chip->revision_id = revision;
                break;
        }

#if defined(__i386__)
        /*
         *      Ignore Symbios chips controlled by SISL RAID controller.
         */
        if (chip && (base_2 & PCI_BASE_ADDRESS_MEM_MASK)) {
                unsigned int ScriptsSize, MagicValue;
                vm_offset_t ScriptsRAM;

                if (chip->features & FE_RAM8K)
                        ScriptsSize = 8192;
                else
                        ScriptsSize = 4096;

                ScriptsRAM = remap_pci_mem(base_2 & PCI_BASE_ADDRESS_MEM_MASK,
                                           ScriptsSize);
                if (ScriptsRAM) {
                        MagicValue = readl(ScriptsRAM + ScriptsSize - 16);
                        unmap_pci_mem(ScriptsRAM, ScriptsSize);
                        if (MagicValue == 0x52414944)
                                return -1;
                }
        }
#endif

        printk(KERN_INFO "ncr53c8xx: at PCI bus %d, device %d, function %d\n",
                bus, (int) (device_fn & 0xf8) >> 3, (int) device_fn & 7);

        if (!chip) {
                printk("ncr53c8xx: not initializing, device not supported\n");
                return -1;
        }

#ifdef __powerpc__
        /*
         *      Several fix-up for power/pc.
         *      Should not be performed by the driver.
         */
        if (!(command & PCI_COMMAND_MASTER)) {
                printk("ncr53c8xx: attempting to force PCI_COMMAND_MASTER...");
                command |= PCI_COMMAND_MASTER;
                pcibios_write_config_word(bus, device_fn, PCI_COMMAND, command);
                pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
                if (!(command & PCI_COMMAND_MASTER)) {
                        printk("failed!\n");
                } else {
                        printk("succeeded.\n");
                }
        }

        if (!(command & PCI_COMMAND_IO)) {
                printk("ncr53c8xx: attempting to force PCI_COMMAND_IO...");
                command |= PCI_COMMAND_IO;
                pcibios_write_config_word(bus, device_fn, PCI_COMMAND, command);
                pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
                if (!(command & PCI_COMMAND_IO)) {
                        printk("failed!\n");
                } else {
                        printk("succeeded.\n");
                }
        }

        if (!(command & PCI_COMMAND_MEMORY)) {
                printk("ncr53c8xx: attempting to force PCI_COMMAND_MEMORY...");
                command |= PCI_COMMAND_MEMORY;
                pcibios_write_config_word(bus, device_fn, PCI_COMMAND, command);
                pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
                if (!(command & PCI_COMMAND_MEMORY)) {
                        printk("failed!\n");
                } else {
                        printk("succeeded.\n");
                }
        }


#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,140)
        if ( is_prep ) {
                if (io_port >= 0x10000000) {
                        printk("ncr53c8xx: reallocating io_port (Wacky IBM)");
                        io_port = (io_port & 0x00FFFFFF) | 0x01000000;
                        pcibios_write_config_dword(bus, device_fn, PCI_BASE_ADDRESS_0, io_port);
                }
                if (base >= 0x10000000) {
                        printk("ncr53c8xx: reallocating base (Wacky IBM)");
                        base = (base & 0x00FFFFFF) | 0x01000000;
                        pcibios_write_config_dword(bus, device_fn, PCI_BASE_ADDRESS_1, base);
                }
                if (base_2 >= 0x10000000) {
                        printk("ncr53c8xx: reallocating base2 (Wacky IBM)");
                        base_2 = (base_2 & 0x00FFFFFF) | 0x01000000;
                        pcibios_write_config_dword(bus, device_fn, PCI_BASE_ADDRESS_2, base_2);
                }
        }
#endif
#endif  /* __powerpc__ */

#ifdef __sparc__
        /*
         *      Severall fix-ups for sparc.
         *
         *      Should not be performed by the driver, but how can OBP know
         *      each and every PCI card, if they don't use Fcode?
         */

        if (!(command & PCI_COMMAND_MASTER)) {
                if (initverbose >= 2)
                        printk("ncr53c8xx: setting PCI_COMMAND_MASTER bit (fixup)\n");
                command |= PCI_COMMAND_MASTER;
                pcibios_write_config_word(bus, device_fn, PCI_COMMAND, command);
                pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
        }

        if ((chip->features & FE_WRIE) && !(command & PCI_COMMAND_INVALIDATE)) {
                if (initverbose >= 2)
                        printk("ncr53c8xx: setting PCI_COMMAND_INVALIDATE bit (fixup)\n");
                command |= PCI_COMMAND_INVALIDATE;
                pcibios_write_config_word(bus, device_fn, PCI_COMMAND, command);
                pcibios_read_config_word(bus, device_fn, PCI_COMMAND, &command);
        }

        if ((chip->features & FE_CLSE) && !cache_line_size) {
                /* PCI_CACHE_LINE_SIZE value is in 32-bit words. */
                cache_line_size = 64 / sizeof(u_int32);
                if (initverbose >= 2)
                        printk("ncr53c8xx: setting PCI_CACHE_LINE_SIZE to %d (fixup)\n", cache_line_size);
                pcibios_write_config_byte(bus, device_fn,
                                          PCI_CACHE_LINE_SIZE, cache_line_size);
                pcibios_read_config_byte(bus, device_fn,
                                         PCI_CACHE_LINE_SIZE, &cache_line_size);
        }

        if (!latency_timer) {
                latency_timer = 64;
                if (initverbose >= 2)
                        printk("ncr53c8xx: setting PCI_LATENCY_TIMER to %d bus clocks (fixup)\n", latency_timer);
                pcibios_write_config_byte(bus, device_fn,
                                          PCI_LATENCY_TIMER, latency_timer);
                pcibios_read_config_byte(bus, device_fn,
                                         PCI_LATENCY_TIMER, &latency_timer);
        }
#endif  /* __sparc__ */

        /*
         * Check availability of IO space, memory space and master capability.
         * No need to test BARs flags since they are hardwired to the
         * expected value.
         */
        if (command & PCI_COMMAND_IO)
                io_port &= PCI_BASE_ADDRESS_IO_MASK;
        else
                io_port = 0;

        if (command & PCI_COMMAND_MEMORY)
                base &= PCI_BASE_ADDRESS_MEM_MASK;
        else
                base = 0;
        
        if (!io_port && !base) {
                printk("ncr53c8xx: not initializing, both I/O and memory mappings disabled\n");
                return -1;
        }

        base_2 &= PCI_BASE_ADDRESS_MEM_MASK;

        if (io_port && check_region (io_port, 128)) {
#ifdef __sparc__
                printk("ncr53c8xx: IO region 0x%lx to 0x%lx is in use\n",
                        io_port, (io_port + 127));
#else
                printk("ncr53c8xx: IO region 0x%x to 0x%x is in use\n",
                        (int) io_port, (int) (io_port + 127));
#endif
                return -1;
        }
        
        if (!(command & PCI_COMMAND_MASTER)) {
                printk("ncr53c8xx: not initializing, BUS MASTERING was disabled\n");
                return -1;
        }

        /*
         * Fix some features according to driver setup.
         */
        if (!(driver_setup.special_features & 1))
                chip->features &= ~FE_SPECIAL_SET;
        else {
                if (driver_setup.special_features & 2)
                        chip->features &= ~FE_WRIE;
        }
        if (driver_setup.ultra_scsi < 2 && (chip->features & FE_ULTRA2)) {
                chip->features |=  FE_ULTRA;
                chip->features &= ~FE_ULTRA2;
        }
        if (driver_setup.ultra_scsi < 1)
                chip->features &= ~FE_ULTRA;
        if (!driver_setup.max_wide)
                chip->features &= ~FE_WIDE;


#ifdef  SCSI_NCR_PCI_FIX_UP_SUPPORT

        /*
         * Try to fix up PCI config according to wished features.
         */
#if defined(__i386__) && !defined(MODULE)
        if ((driver_setup.pci_fix_up & 1) &&
            (chip->features & FE_CLSE) && cache_line_size == 0) {
#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,75)
                extern char x86;
                switch(x86) {
#else
                switch(boot_cpu_data.x86) {
#endif
                case 4: cache_line_size = 4; break;
                case 6:
                case 5: cache_line_size = 8; break;
                }
                if (cache_line_size)
                        (void) pcibios_write_config_byte(bus, device_fn,
                                        PCI_CACHE_LINE_SIZE, cache_line_size);
                if (initverbose)
                        printk("ncr53c8xx: setting PCI_CACHE_LINE_SIZE to %d (fix-up).\n", cache_line_size);
        }

        if ((driver_setup.pci_fix_up & 2) && cache_line_size &&
            (chip->features & FE_WRIE) && !(command & PCI_COMMAND_INVALIDATE)) {
                command |= PCI_COMMAND_INVALIDATE;
                (void) pcibios_write_config_word(bus, device_fn,
                                                PCI_COMMAND, command);
                if (initverbose)
                        printk("ncr53c8xx: setting PCI_COMMAND_INVALIDATE bit (fix-up).\n");
        }
#endif
        /*
         * Fix up for old chips that support READ LINE but not CACHE LINE SIZE.
         * - If CACHE LINE SIZE is unknown, set burst max to 32 bytes = 8 dwords
         *   and donnot enable READ LINE.
         * - Otherwise set it to the CACHE LINE SIZE (power of 2 assumed). 
         */

        if (!(chip->features & FE_CLSE)) {
                int burst_max = chip->burst_max;
                if (cache_line_size == 0) {
                        chip->features  &= ~FE_ERL;
                        if (burst_max > 3)
                                burst_max = 3;
                }
                else {
                        while (cache_line_size < (1 << burst_max))
                                --burst_max;
                }
                chip->burst_max = burst_max;
        }

        /*
         * Tune PCI LATENCY TIMER according to burst max length transfer.
         * (latency timer >= burst length + 6, we add 10 to be quite sure)
         * If current value is zero, the device has probably been configured 
         * for no bursting due to some broken hardware.
         */

        if (latency_timer == 0 && chip->burst_max)
                printk("ncr53c8xx: PCI_LATENCY_TIMER=0, bursting should'nt be allowed.\n");

        if ((driver_setup.pci_fix_up & 4) && chip->burst_max) {
                uchar lt = (1 << chip->burst_max) + 6 + 10;
                if (latency_timer < lt) {
                        latency_timer = lt;
                        if (initverbose)
                                printk("ncr53c8xx: setting PCI_LATENCY_TIMER to %d bus clocks (fix-up).\n", latency_timer);
                         (void) pcibios_write_config_byte(bus, device_fn,
                                        PCI_LATENCY_TIMER, latency_timer);
                }
        }

        /*
         * Fix up for recent chips that support CACHE LINE SIZE.
         * If PCI config space is not OK, remove features that shall not be 
         * used by the chip. No need to trigger possible chip bugs.
         */

        if ((chip->features & FE_CLSE) && cache_line_size == 0) {
                chip->features &= ~FE_CACHE_SET;
                printk("ncr53c8xx: PCI_CACHE_LINE_SIZE not set, features based on CACHE LINE SIZE not used.\n");
        }

        if ((chip->features & FE_WRIE) && !(command & PCI_COMMAND_INVALIDATE)) {
                chip->features &= ~FE_WRIE;
                printk("ncr53c8xx: PCI_COMMAND_INVALIDATE not set, WRITE AND INVALIDATE not used\n");
        }

#endif  /* SCSI_NCR_PCI_FIX_UP_SUPPORT */

        /* initialise ncr_device structure with items required by ncr_attach */
        device->slot.bus        = bus;
        device->slot.device_fn  = device_fn;
        device->slot.base       = base;
        device->slot.base_2     = base_2;
        device->slot.io_port    = io_port;
        device->slot.irq        = irq;
        device->attach_done     = 0;
#ifdef SCSI_NCR_NVRAM_SUPPORT
        if (!nvram)
                goto out;

        /*
        ** Get access to chip IO registers
        */
#ifdef NCR_IOMAPPED
        request_region(io_port, 128, "ncr53c8xx");
        device->slot.port = io_port;
#else
        device->slot.reg = (struct ncr_reg *) remap_pci_mem((ulong) base, 128);
        if (!device->slot.reg)
                goto out;
#endif

        /*
        ** Try to read SYMBIOS nvram.
        ** Data can be used to order booting of boards.
        **
        ** Data is saved in ncr_device structure if NVRAM found. This
        ** is then used to find drive boot order for ncr_attach().
        **
        ** NVRAM data is passed to Scsi_Host_Template later during ncr_attach()
        ** for any device set up.
        **
        ** Try to read TEKRAM nvram if Symbios nvram not found.
        */

        if      (!ncr_get_Symbios_nvram(&device->slot, &nvram->data.Symbios))
                nvram->type = SCSI_NCR_SYMBIOS_NVRAM;
        else if (!ncr_get_Tekram_nvram(&device->slot, &nvram->data.Tekram))
                nvram->type = SCSI_NCR_TEKRAM_NVRAM;
        else
                nvram->type = 0;
out:
        /*
        ** Release access to chip IO registers
        */
#ifdef NCR_IOMAPPED
        release_region(device->slot.port, 128);
#else
        unmap_pci_mem((vm_offset_t) device->slot.reg, (u_long) 128);
#endif

#endif  /* SCSI_NCR_NVRAM_SUPPORT */
        return 0;     
}

/*
**   Linux select queue depths function
*/

#define DEF_DEPTH       (driver_setup.default_tags)
#define ALL_TARGETS     -2
#define NO_TARGET       -1
#define ALL_LUNS        -2
#define NO_LUN          -1

static int device_queue_depth(ncb_p np, int target, int lun)
{
        int c, h, t, u, v;
        char *p = driver_setup.tag_ctrl;
        char *ep;

        h = -1;
        t = NO_TARGET;
        u = NO_LUN;
        while ((c = *p++) != 0) {
                v = simple_strtoul(p, &ep, 0);
                switch(c) {
                case '/':
                        ++h;
                        t = ALL_TARGETS;
                        u = ALL_LUNS;
                        break;
                case 't':
                        if (t != target)
                                t = (target == v) ? v : NO_TARGET;
                        u = ALL_LUNS;
                        break;
                case 'u':
                        if (u != lun)
                                u = (lun == v) ? v : NO_LUN;
                        break;
                case 'q':
                        if (h == np->unit &&
                                (t == ALL_TARGETS || t == target) &&
                                (u == ALL_LUNS    || u == lun))
                                return v;
                        break;
                case '-':
                        t = ALL_TARGETS;
                        u = ALL_LUNS;
                        break;
                default:
                        break;
                }
                p = ep;
        }
        return DEF_DEPTH;
}

static void ncr53c8xx_select_queue_depths(struct Scsi_Host *host, struct scsi_device *devlist)
{
        struct scsi_device *device;

        for (device = devlist; device; device = device->next) {
                ncb_p np;
                tcb_p tp;
                lcb_p lp;
                int numtags;

                if (device->host != host)
                        continue;

                np = ((struct host_data *) host->hostdata)->ncb;
                tp = &np->target[device->id];
                lp = tp->lp[device->lun];

                /*
                **      Select queue depth from driver setup.
                **      Donnot use more than configured by user.
                **      Use at least 2.
                **      Donnot use more than our maximum.
                */
                numtags = device_queue_depth(np, device->id, device->lun);
                if (numtags > tp->usrtags)
                        numtags = tp->usrtags;
                if (!device->tagged_supported)
                        numtags = 1;
                device->queue_depth = numtags;
                if (device->queue_depth < 2)
                        device->queue_depth = 2;
                if (device->queue_depth > SCSI_NCR_MAX_TAGS)
                        device->queue_depth = SCSI_NCR_MAX_TAGS;

                /*
                **      Since the queue depth is not tunable under Linux,
                **      we need to know this value in order not to 
                **      announce stupid things to user.
                */
                if (lp) {
                        lp->numtags = lp->maxtags = numtags;
                        lp->scdev_depth = device->queue_depth;
                }
                ncr_setup_tags (np, device->id, device->lun);

#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx_select_queue_depth: host=%d, id=%d, lun=%d, depth=%d\n",
        np->unit, device->id, device->lun, device->queue_depth);
#endif
        }
}

/*
**   Linux entry point for info() function
*/
const char *ncr53c8xx_info (struct Scsi_Host *host)
{
        return SCSI_NCR_DRIVER_NAME;
}

/*
**   Linux entry point of queuecommand() function
*/

int ncr53c8xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *))
{
     ncb_p np = ((struct host_data *) cmd->host->hostdata)->ncb;
     unsigned long flags;
     int sts;

#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx_queue_command\n");
#endif

     cmd->scsi_done     = done;
     cmd->host_scribble = NULL;

     NCR_LOCK_NCB(np, flags);

     if ((sts = ncr_queue_command(np, cmd)) != DID_OK) {
          cmd->result = ScsiResult(sts, 0);
#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx : command not queued - result=%d\n", sts);
#endif
     }
#ifdef DEBUG_NCR53C8XX
     else
printk("ncr53c8xx : command successfully queued\n");
#endif

     NCR_UNLOCK_NCB(np, flags);

     if (sts != DID_OK)
          done(cmd);

     return sts;
}

/*
**   Linux entry point of the interrupt handler.
**   Since linux versions > 1.3.70, we trust the kernel for 
**   passing the internal host descriptor as 'dev_id'.
**   Otherwise, we scan the host list and call the interrupt 
**   routine for each host that uses this IRQ.
*/

static void ncr53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs)
{
     unsigned long flags;
     ncb_p np = (ncb_p) dev_id;
     Scsi_Cmnd *done_list;

#ifdef DEBUG_NCR53C8XX
     printk("ncr53c8xx : interrupt received\n");
#endif

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("[");

     NCR_LOCK_NCB(np, flags);
     ncr_exception(np);
     done_list     = np->done_list;
     np->done_list = 0;
     NCR_UNLOCK_NCB(np, flags);

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("]\n");

     if (done_list) {
          NCR_LOCK_SCSI_DONE(np, flags);
          ncr_flush_done_cmds(done_list);
          NCR_UNLOCK_SCSI_DONE(np, flags);
     }
}

/*
**   Linux entry point of the timer handler
*/

static void ncr53c8xx_timeout(unsigned long npref)
{
     ncb_p np = (ncb_p) npref;
     unsigned long flags;
     Scsi_Cmnd *done_list;

     NCR_LOCK_NCB(np, flags);
     ncr_timeout((ncb_p) np);
     done_list     = np->done_list;
     np->done_list = 0;
     NCR_UNLOCK_NCB(np, flags);

     if (done_list) {
          NCR_LOCK_SCSI_DONE(np, flags);
          ncr_flush_done_cmds(done_list);
          NCR_UNLOCK_SCSI_DONE(np, flags);
     }
}

/*
**   Linux entry point of reset() function
*/

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
int ncr53c8xx_reset(Scsi_Cmnd *cmd, unsigned int reset_flags)
#else
int ncr53c8xx_reset(Scsi_Cmnd *cmd)
#endif
{
        ncb_p np = ((struct host_data *) cmd->host->hostdata)->ncb;
        int sts;
        unsigned long flags;
        Scsi_Cmnd *done_list;

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        printk("ncr53c8xx_reset: pid=%lu reset_flags=%x serial_number=%ld serial_number_at_timeout=%ld\n",
                cmd->pid, reset_flags, cmd->serial_number, cmd->serial_number_at_timeout);
#else
        printk("ncr53c8xx_reset: command pid %lu\n", cmd->pid);
#endif

        NCR_LOCK_NCB(np, flags);

        /*
         * We have to just ignore reset requests in some situations.
         */
#if defined SCSI_RESET_NOT_RUNNING
        if (cmd->serial_number != cmd->serial_number_at_timeout) {
                sts = SCSI_RESET_NOT_RUNNING;
                goto out;
        }
#endif
        /*
         * If the mid-level driver told us reset is synchronous, it seems 
         * that we must call the done() callback for the involved command, 
         * even if this command was not queued to the low-level driver, 
         * before returning SCSI_RESET_SUCCESS.
         */

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        sts = ncr_reset_bus(np, cmd,
        (reset_flags & (SCSI_RESET_SYNCHRONOUS | SCSI_RESET_ASYNCHRONOUS)) == SCSI_RESET_SYNCHRONOUS);
#else
        sts = ncr_reset_bus(np, cmd, 0);
#endif

        /*
         * Since we always reset the controller, when we return success, 
         * we add this information to the return code.
         */
#if defined SCSI_RESET_HOST_RESET
        if (sts == SCSI_RESET_SUCCESS)
                sts |= SCSI_RESET_HOST_RESET;
#endif

out:
        done_list     = np->done_list;
        np->done_list = 0;
        NCR_UNLOCK_NCB(np, flags);

        ncr_flush_done_cmds(done_list);

        return sts;
}

/*
**   Linux entry point of abort() function
*/

int ncr53c8xx_abort(Scsi_Cmnd *cmd)
{
        ncb_p np = ((struct host_data *) cmd->host->hostdata)->ncb;
        int sts;
        unsigned long flags;
        Scsi_Cmnd *done_list;

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        printk("ncr53c8xx_abort: pid=%lu serial_number=%ld serial_number_at_timeout=%ld\n",
                cmd->pid, cmd->serial_number, cmd->serial_number_at_timeout);
#else
        printk("ncr53c8xx_abort: command pid %lu\n", cmd->pid);
#endif

        NCR_LOCK_NCB(np, flags);

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        /*
         * We have to just ignore abort requests in some situations.
         */
        if (cmd->serial_number != cmd->serial_number_at_timeout) {
                sts = SCSI_ABORT_NOT_RUNNING;
                goto out;
        }
#endif

        sts = ncr_abort_command(np, cmd);
out:
        done_list     = np->done_list;
        np->done_list = 0;
        NCR_UNLOCK_NCB(np, flags);

        ncr_flush_done_cmds(done_list);

        return sts;
}


#ifdef MODULE
int ncr53c8xx_release(struct Scsi_Host *host)
{
#ifdef DEBUG_NCR53C8XX
printk("ncr53c8xx : release\n");
#endif
     ncr_detach(((struct host_data *) host->hostdata)->ncb);

     return 1;
}
#endif


/*
**      Scsi command waiting list management.
**
**      It may happen that we cannot insert a scsi command into the start queue,
**      in the following circumstances.
**              Too few preallocated ccb(s), 
**              maxtags < cmd_per_lun of the Linux host control block,
**              etc...
**      Such scsi commands are inserted into a waiting list.
**      When a scsi command complete, we try to requeue the commands of the
**      waiting list.
*/

#define next_wcmd host_scribble

static void insert_into_waiting_list(ncb_p np, Scsi_Cmnd *cmd)
{
        Scsi_Cmnd *wcmd;

#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx inserted into waiting list\n", ncr_name(np), (u_long) cmd);
#endif
        cmd->next_wcmd = 0;
        if (!(wcmd = np->waiting_list)) np->waiting_list = cmd;
        else {
                while ((wcmd->next_wcmd) != 0)
                        wcmd = (Scsi_Cmnd *) wcmd->next_wcmd;
                wcmd->next_wcmd = (char *) cmd;
        }
}

static Scsi_Cmnd *retrieve_from_waiting_list(int to_remove, ncb_p np, Scsi_Cmnd *cmd)
{
        Scsi_Cmnd **pcmd = &np->waiting_list;

        while (*pcmd) {
                if (cmd == *pcmd) {
                        if (to_remove) {
                                *pcmd = (Scsi_Cmnd *) cmd->next_wcmd;
                                cmd->next_wcmd = 0;
                        }
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx retrieved from waiting list\n", ncr_name(np), (u_long) cmd);
#endif
                        return cmd;
                }
                pcmd = (Scsi_Cmnd **) &(*pcmd)->next_wcmd;
        }
        return 0;
}

static void process_waiting_list(ncb_p np, int sts)
{
        Scsi_Cmnd *waiting_list, *wcmd;

        waiting_list = np->waiting_list;
        np->waiting_list = 0;

#ifdef DEBUG_WAITING_LIST
        if (waiting_list) printk("%s: waiting_list=%lx processing sts=%d\n", ncr_name(np), (u_long) waiting_list, sts);
#endif
        while ((wcmd = waiting_list) != 0) {
                waiting_list = (Scsi_Cmnd *) wcmd->next_wcmd;
                wcmd->next_wcmd = 0;
                if (sts == DID_OK) {
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx trying to requeue\n", ncr_name(np), (u_long) wcmd);
#endif
                        sts = ncr_queue_command(np, wcmd);
                }
                if (sts != DID_OK) {
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx done forced sts=%d\n", ncr_name(np), (u_long) wcmd, sts);
#endif
                        wcmd->result = ScsiResult(sts, 0);
                        ncr_queue_done_cmd(np, wcmd);
                }
        }
}

#undef next_wcmd

#ifdef SCSI_NCR_PROC_INFO_SUPPORT

/*=========================================================================
**      Proc file system stuff
**
**      A read operation returns profile information.
**      A write operation is a control command.
**      The string is parsed in the driver code and the command is passed 
**      to the ncr_usercmd() function.
**=========================================================================
*/

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT

#define is_digit(c)     ((c) >= '0' && (c) <= '9')
#define digit_to_bin(c) ((c) - '0')
#define is_space(c)     ((c) == ' ' || (c) == '\t')

static int skip_spaces(char *ptr, int len)
{
        int cnt, c;

        for (cnt = len; cnt > 0 && (c = *ptr++) && is_space(c); cnt--);

        return (len - cnt);
}

static int get_int_arg(char *ptr, int len, u_long *pv)
{
        int     cnt, c;
        u_long  v;

        for (v = 0, cnt = len; cnt > 0 && (c = *ptr++) && is_digit(c); cnt--) {
                v = (v * 10) + digit_to_bin(c);
        }

        if (pv)
                *pv = v;

        return (len - cnt);
}

static int is_keyword(char *ptr, int len, char *verb)
{
        int verb_len = strlen(verb);

        if (len >= strlen(verb) && !memcmp(verb, ptr, verb_len))
                return verb_len;
        else
                return 0;

}

#define SKIP_SPACES(min_spaces)                                         \
        if ((arg_len = skip_spaces(ptr, len)) < (min_spaces))           \
                return -EINVAL;                                         \
        ptr += arg_len; len -= arg_len;

#define GET_INT_ARG(v)                                                  \
        if (!(arg_len = get_int_arg(ptr, len, &(v))))                   \
                return -EINVAL;                                         \
        ptr += arg_len; len -= arg_len;


/*
**      Parse a control command
*/

static int ncr_user_command(ncb_p np, char *buffer, int length)
{
        char *ptr       = buffer;
        int len         = length;
        struct usrcmd    *uc = &np->user;
        int             arg_len;
        u_long          target;

        bzero(uc, sizeof(*uc));

        if (len > 0 && ptr[len-1] == '\n')
                --len;

        if      ((arg_len = is_keyword(ptr, len, "setsync")) != 0)
                uc->cmd = UC_SETSYNC;
        else if ((arg_len = is_keyword(ptr, len, "settags")) != 0)
                uc->cmd = UC_SETTAGS;
        else if ((arg_len = is_keyword(ptr, len, "setorder")) != 0)
                uc->cmd = UC_SETORDER;
        else if ((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
                uc->cmd = UC_SETVERBOSE;
        else if ((arg_len = is_keyword(ptr, len, "setwide")) != 0)
                uc->cmd = UC_SETWIDE;
        else if ((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
                uc->cmd = UC_SETDEBUG;
        else if ((arg_len = is_keyword(ptr, len, "setflag")) != 0)
                uc->cmd = UC_SETFLAG;
        else if ((arg_len = is_keyword(ptr, len, "clearprof")) != 0)
                uc->cmd = UC_CLEARPROF;
        else
                arg_len = 0;

#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
#endif

        if (!arg_len)
                return -EINVAL;
        ptr += arg_len; len -= arg_len;

        switch(uc->cmd) {
        case UC_SETSYNC:
        case UC_SETTAGS:
        case UC_SETWIDE:
        case UC_SETFLAG:
                SKIP_SPACES(1);
                if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
                        ptr += arg_len; len -= arg_len;
                        uc->target = ~0;
                } else {
                        GET_INT_ARG(target);
                        uc->target = (1<<target);
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: target=%ld\n", target);
#endif
                }
                break;
        }

        switch(uc->cmd) {
        case UC_SETVERBOSE:
        case UC_SETSYNC:
        case UC_SETTAGS:
        case UC_SETWIDE:
                SKIP_SPACES(1);
                GET_INT_ARG(uc->data);
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: data=%ld\n", uc->data);
#endif
                break;
        case UC_SETORDER:
                SKIP_SPACES(1);
                if      ((arg_len = is_keyword(ptr, len, "simple")))
                        uc->data = M_SIMPLE_TAG;
                else if ((arg_len = is_keyword(ptr, len, "ordered")))
                        uc->data = M_ORDERED_TAG;
                else if ((arg_len = is_keyword(ptr, len, "default")))
                        uc->data = 0;
                else
                        return -EINVAL;
                break;
        case UC_SETDEBUG:
                while (len > 0) {
                        SKIP_SPACES(1);
                        if      ((arg_len = is_keyword(ptr, len, "alloc")))
                                uc->data |= DEBUG_ALLOC;
                        else if ((arg_len = is_keyword(ptr, len, "phase")))
                                uc->data |= DEBUG_PHASE;
                        else if ((arg_len = is_keyword(ptr, len, "poll")))
                                uc->data |= DEBUG_POLL;
                        else if ((arg_len = is_keyword(ptr, len, "queue")))
                                uc->data |= DEBUG_QUEUE;
                        else if ((arg_len = is_keyword(ptr, len, "result")))
                                uc->data |= DEBUG_RESULT;
                        else if ((arg_len = is_keyword(ptr, len, "scatter")))
                                uc->data |= DEBUG_SCATTER;
                        else if ((arg_len = is_keyword(ptr, len, "script")))
                                uc->data |= DEBUG_SCRIPT;
                        else if ((arg_len = is_keyword(ptr, len, "tiny")))
                                uc->data |= DEBUG_TINY;
                        else if ((arg_len = is_keyword(ptr, len, "timing")))
                                uc->data |= DEBUG_TIMING;
                        else if ((arg_len = is_keyword(ptr, len, "nego")))
                                uc->data |= DEBUG_NEGO;
                        else if ((arg_len = is_keyword(ptr, len, "tags")))
                                uc->data |= DEBUG_TAGS;
                        else if ((arg_len = is_keyword(ptr, len, "freeze")))
                                uc->data |= DEBUG_FREEZE;
                        else if ((arg_len = is_keyword(ptr, len, "restart")))
                                uc->data |= DEBUG_RESTART;
                        else
                                return -EINVAL;
                        ptr += arg_len; len -= arg_len;
                }
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: data=%ld\n", uc->data);
#endif
                break;
        case UC_SETFLAG:
                while (len > 0) {
                        SKIP_SPACES(1);
                        if      ((arg_len = is_keyword(ptr, len, "trace")))
                                uc->data |= UF_TRACE;
                        else if ((arg_len = is_keyword(ptr, len, "no_disc")))
                                uc->data |= UF_NODISC;
                        else
                                return -EINVAL;
                        ptr += arg_len; len -= arg_len;
                }
                break;
        default:
                break;
        }

        if (len)
                return -EINVAL;
        else {
                long flags;

                NCR_LOCK_NCB(np, flags);
                ncr_usercmd (np);
                NCR_UNLOCK_NCB(np, flags);
        }
        return length;
}

#endif  /* SCSI_NCR_USER_COMMAND_SUPPORT */

#ifdef SCSI_NCR_USER_INFO_SUPPORT

struct info_str
{
        char *buffer;
        int length;
        int offset;
        int pos;
};

static void copy_mem_info(struct info_str *info, char *data, int len)
{
        if (info->pos + len > info->length)
                len = info->length - info->pos;

        if (info->pos + len < info->offset) {
                info->pos += len;
                return;
        }
        if (info->pos < info->offset) {
                data += (info->offset - info->pos);
                len  -= (info->offset - info->pos);
        }

        if (len > 0) {
                memcpy(info->buffer + info->pos, data, len);
                info->pos += len;
        }
}

static int copy_info(struct info_str *info, char *fmt, ...)
{
        va_list args;
        char buf[81];
        int len;

        va_start(args, fmt);
        len = vsprintf(buf, fmt, args);
        va_end(args);

        copy_mem_info(info, buf, len);
        return len;
}

/*
**      Copy formatted profile information into the input buffer.
*/

#define to_ms(t) ((t) * 1000 / HZ)

static int ncr_host_info(ncb_p np, char *ptr, off_t offset, int len)
{
        struct info_str info;

        info.buffer     = ptr;
        info.length     = len;
        info.offset     = offset;
        info.pos        = 0;

        copy_info(&info, "General information:\n");
        copy_info(&info, "  Chip NCR53C%s, ",   np->chip_name);
        copy_info(&info, "device id 0x%x, ",    np->device_id);
        copy_info(&info, "revision id 0x%x\n",  np->revision_id);

        copy_info(&info, "  IO port address 0x%lx, ", (u_long) np->port);
#ifdef __sparc__
        copy_info(&info, "IRQ number %s\n", __irq_itoa(np->irq));
#else
        copy_info(&info, "IRQ number %d\n", (int) np->irq);
#endif

#ifndef NCR_IOMAPPED
        if (np->reg)
                copy_info(&info, "  Using memory mapped IO at virtual address 0x%lx\n",
                                  (u_long) np->reg);
#endif
        copy_info(&info, "  Synchronous period factor %d, ", (int) np->minsync);
        copy_info(&info, "max commands per lun %d\n", SCSI_NCR_MAX_TAGS);

        if (driver_setup.debug || driver_setup.verbose > 1) {
                copy_info(&info, "  Debug flags 0x%x, ", driver_setup.debug);
                copy_info(&info, "verbosity level %d\n", driver_setup.verbose);
        }

#ifdef SCSI_NCR_PROFILE_SUPPORT
        copy_info(&info, "Profiling information:\n");
        copy_info(&info, "  %-12s = %lu\n", "num_trans",np->profile.num_trans);
        copy_info(&info, "  %-12s = %lu\n", "num_kbytes",np->profile.num_kbytes);
        copy_info(&info, "  %-12s = %lu\n", "num_disc", np->profile.num_disc);
        copy_info(&info, "  %-12s = %lu\n", "num_break",np->profile.num_break);
        copy_info(&info, "  %-12s = %lu\n", "num_int",  np->profile.num_int);
        copy_info(&info, "  %-12s = %lu\n", "num_fly",  np->profile.num_fly);
        copy_info(&info, "  %-12s = %lu\n", "ms_setup", to_ms(np->profile.ms_setup));
        copy_info(&info, "  %-12s = %lu\n", "ms_data",  to_ms(np->profile.ms_data));
        copy_info(&info, "  %-12s = %lu\n", "ms_disc",  to_ms(np->profile.ms_disc));
        copy_info(&info, "  %-12s = %lu\n", "ms_post",  to_ms(np->profile.ms_post));
#endif
        
        return info.pos > info.offset? info.pos - info.offset : 0;
}

#endif /* SCSI_NCR_USER_INFO_SUPPORT */

/*
**      Entry point of the scsi proc fs of the driver.
**      - func = 0 means read  (returns profile data)
**      - func = 1 means write (parse user control command)
*/

static int ncr53c8xx_proc_info(char *buffer, char **start, off_t offset,
                        int length, int hostno, int func)
{
        struct Scsi_Host *host;
        struct host_data *host_data;
        ncb_p ncb = 0;
        int retv;

#ifdef DEBUG_PROC_INFO
printk("ncr53c8xx_proc_info: hostno=%d, func=%d\n", hostno, func);
#endif

        for (host = first_host; host; host = host->next) {
                if (host->hostt == the_template && host->host_no == hostno) {
                        host_data = (struct host_data *) host->hostdata;
                        ncb = host_data->ncb;
                        break;
                }
        }

        if (!ncb)
                return -EINVAL;

        if (func) {
#ifdef  SCSI_NCR_USER_COMMAND_SUPPORT
                retv = ncr_user_command(ncb, buffer, length);
#else
                retv = -EINVAL;
#endif
        }
        else {
                if (start)
                        *start = buffer;
#ifdef SCSI_NCR_USER_INFO_SUPPORT
                retv = ncr_host_info(ncb, buffer, offset, length);
#else
                retv = -EINVAL;
#endif
        }

        return retv;
}


/*=========================================================================
**      End of proc file system stuff
**=========================================================================
*/
#endif


#ifdef SCSI_NCR_NVRAM_SUPPORT

/* ---------------------------------------------------------------------
**
**      Try reading Symbios format nvram
**
** ---------------------------------------------------------------------
**
** GPOI0 - data in/data out
** GPIO1 - clock
**
**      return 0 if NVRAM data OK, 1 if NVRAM data not OK
** ---------------------------------------------------------------------
*/

#define SET_BIT 0
#define CLR_BIT 1
#define SET_CLK 2
#define CLR_CLK 3

static u_short nvram_read_data(ncr_slot *np, u_char *data, int len, u_char *gpreg, u_char *gpcntl);
static void nvram_start(ncr_slot *np, u_char *gpreg);
static void nvram_write_byte(ncr_slot *np, u_char *ack_data, u_char write_data, u_char *gpreg, u_char *gpcntl);
static void nvram_read_byte(ncr_slot *np, u_char *read_data, u_char ack_data, u_char *gpreg, u_char *gpcntl);
static void nvram_readAck(ncr_slot *np, u_char *read_bit, u_char *gpreg, u_char *gpcntl);
static void nvram_writeAck(ncr_slot *np, u_char write_bit, u_char *gpreg, u_char *gpcntl);
static void nvram_doBit(ncr_slot *np, u_char *read_bit, u_char write_bit, u_char *gpreg);
static void nvram_stop(ncr_slot *np, u_char *gpreg);
static void nvram_setBit(ncr_slot *np, u_char write_bit, u_char *gpreg, int bit_mode);

static int __init ncr_get_Symbios_nvram (ncr_slot *np, Symbios_nvram *nvram)
{
        static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
        u_char  gpcntl, gpreg;
        u_char  old_gpcntl, old_gpreg;
        u_short csum;
        u_char  ack_data;
        int     retv = 1;

        /* save current state of GPCNTL and GPREG */
        old_gpreg       = INB (nc_gpreg);
        old_gpcntl      = INB (nc_gpcntl);
        gpcntl          = old_gpcntl & 0xfc;

        /* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
        OUTB (nc_gpreg,  old_gpreg);
        OUTB (nc_gpcntl, gpcntl);

        /* this is to set NVRAM into a known state with GPIO0/1 both low */
        gpreg = old_gpreg;
        nvram_setBit(np, 0, &gpreg, CLR_CLK);
        nvram_setBit(np, 0, &gpreg, CLR_BIT);
                
        /* now set NVRAM inactive with GPIO0/1 both high */
        nvram_stop(np, &gpreg);
        
        /* activate NVRAM */
        nvram_start(np, &gpreg);

        /* write device code and random address MSB */
        nvram_write_byte(np, &ack_data,
                0xa0 | ((SYMBIOS_NVRAM_ADDRESS >> 7) & 0x0e), &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* write random address LSB */
        nvram_write_byte(np, &ack_data,
                (SYMBIOS_NVRAM_ADDRESS & 0x7f) << 1, &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* regenerate START state to set up for reading */
        nvram_start(np, &gpreg);
        
        /* rewrite device code and address MSB with read bit set (lsb = 0x01) */
        nvram_write_byte(np, &ack_data,
                0xa1 | ((SYMBIOS_NVRAM_ADDRESS >> 7) & 0x0e), &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* now set up GPIO0 for inputting data */
        gpcntl |= 0x01;
        OUTB (nc_gpcntl, gpcntl);
                
        /* input all active data - only part of total NVRAM */
        csum = nvram_read_data(np,
                        (u_char *) nvram, sizeof(*nvram), &gpreg, &gpcntl);

        /* finally put NVRAM back in inactive mode */
        gpcntl &= 0xfe;
        OUTB (nc_gpcntl, gpcntl);
        nvram_stop(np, &gpreg);
        
#ifdef SCSI_NCR_DEBUG_NVRAM
printk("ncr53c8xx: NvRAM marker=%x trailer=%x %x %x %x %x %x byte_count=%d/%d checksum=%x/%x\n",
        nvram->start_marker,
        nvram->trailer[0], nvram->trailer[1], nvram->trailer[2],
        nvram->trailer[3], nvram->trailer[4], nvram->trailer[5],
        nvram->byte_count, sizeof(*nvram) - 12,
        nvram->checksum, csum);
#endif

        /* check valid NVRAM signature, verify byte count and checksum */
        if (nvram->start_marker == 0 &&
            !memcmp(nvram->trailer, Symbios_trailer, 6) &&
            nvram->byte_count == sizeof(*nvram) - 12 &&
            csum == nvram->checksum)
                retv = 0;
out:
        /* return GPIO0/1 to original states after having accessed NVRAM */
        OUTB (nc_gpcntl, old_gpcntl);
        OUTB (nc_gpreg,  old_gpreg);

        return retv;
}

/*
 * Read Symbios NvRAM data and compute checksum.
 */
static u_short __init nvram_read_data(ncr_slot *np, u_char *data, int len,
                                      u_char *gpreg, u_char *gpcntl)
{
        int     x;
        u_short csum;

        for (x = 0; x < len; x++) 
                nvram_read_byte(np, &data[x], (x == (len - 1)), gpreg, gpcntl);

        for (x = 6, csum = 0; x < len - 6; x++)
                csum += data[x];

        return csum;
}

/*
 * Send START condition to NVRAM to wake it up.
 */
static void __init nvram_start(ncr_slot *np, u_char *gpreg)
{
        nvram_setBit(np, 1, gpreg, SET_BIT);
        nvram_setBit(np, 0, gpreg, SET_CLK);
        nvram_setBit(np, 0, gpreg, CLR_BIT);
        nvram_setBit(np, 0, gpreg, CLR_CLK);
}

/*
 * WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
 * GPIO0 must already be set as an output
 */
static void __init nvram_write_byte(ncr_slot *np, u_char *ack_data,
                                    u_char write_data, u_char *gpreg,
                                    u_char *gpcntl)
{
        int x;
        
        for (x = 0; x < 8; x++)
                nvram_doBit(np, 0, (write_data >> (7 - x)) & 0x01, gpreg);
                
        nvram_readAck(np, ack_data, gpreg, gpcntl);
}

/*
 * READ a byte from the NVRAM and then send an ACK to say we have got it,
 * GPIO0 must already be set as an input
 */
static void __init nvram_read_byte(ncr_slot *np, u_char *read_data,
                                   u_char ack_data, u_char *gpreg,
                                   u_char *gpcntl)
{
        int x;
        u_char read_bit;

        *read_data = 0;
        for (x = 0; x < 8; x++) {
                nvram_doBit(np, &read_bit, 1, gpreg);
                *read_data |= ((read_bit & 0x01) << (7 - x));
        }

        nvram_writeAck(np, ack_data, gpreg, gpcntl);
}

/*
 * Output an ACK to the NVRAM after reading,
 * change GPIO0 to output and when done back to an input
 */
static void __init nvram_writeAck(ncr_slot *np, u_char write_bit,
                                  u_char *gpreg, u_char *gpcntl)
{
        OUTB (nc_gpcntl, *gpcntl & 0xfe);
        nvram_doBit(np, 0, write_bit, gpreg);
        OUTB (nc_gpcntl, *gpcntl);
}

/*
 * Input an ACK from NVRAM after writing,
 * change GPIO0 to input and when done back to an output
 */
static void __init nvram_readAck(ncr_slot *np, u_char *read_bit,
                                 u_char *gpreg, u_char *gpcntl)
{
        OUTB (nc_gpcntl, *gpcntl | 0x01);
        nvram_doBit(np, read_bit, 1, gpreg);
        OUTB (nc_gpcntl, *gpcntl);
}

/*
 * Read or write a bit to the NVRAM,
 * read if GPIO0 input else write if GPIO0 output
 */
static void __init nvram_doBit(ncr_slot *np, u_char *read_bit,
                               u_char write_bit, u_char *gpreg)
{
        nvram_setBit(np, write_bit, gpreg, SET_BIT);
        nvram_setBit(np, 0, gpreg, SET_CLK);
        if (read_bit)
                *read_bit = INB (nc_gpreg);
        nvram_setBit(np, 0, gpreg, CLR_CLK);
        nvram_setBit(np, 0, gpreg, CLR_BIT);
}

/*
 * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
 */
static void __init nvram_stop(ncr_slot *np, u_char *gpreg)
{
        nvram_setBit(np, 0, gpreg, SET_CLK);
        nvram_setBit(np, 1, gpreg, SET_BIT);
}

/*
 * Set/clear data/clock bit in GPIO0
 */
static void __init nvram_setBit(ncr_slot *np, u_char write_bit,
                                u_char *gpreg, int bit_mode)
{
        UDELAY (5);
        switch (bit_mode){
        case SET_BIT:
                *gpreg |= write_bit;
                break;
        case CLR_BIT:
                *gpreg &= 0xfe;
                break;
        case SET_CLK:
                *gpreg |= 0x02;
                break;
        case CLR_CLK:
                *gpreg &= 0xfd;
                break;

        }
        OUTB (nc_gpreg, *gpreg);
        UDELAY (5);
}

#undef SET_BIT 0
#undef CLR_BIT 1
#undef SET_CLK 2
#undef CLR_CLK 3


/* ---------------------------------------------------------------------
**
**      Try reading Tekram format nvram
**
** ---------------------------------------------------------------------
**
** GPOI0 - data in
** GPIO1 - data out
** GPIO2 - clock
** GPIO4 - chip select
**
**      return 0 if NVRAM data OK, 1 if NVRAM data not OK
** ---------------------------------------------------------------------
*/

static u_short Tnvram_read_data(ncr_slot *np, u_short *data, int len, u_char *gpreg);
static void Tnvram_Send_Command(ncr_slot *np, u_short write_data, u_char *read_bit, u_char *gpreg);
static void Tnvram_Read_Word(ncr_slot *np, u_short *nvram_data, u_char *gpreg);
static void Tnvram_Read_Bit(ncr_slot *np, u_char *read_bit, u_char *gpreg);
static void Tnvram_Write_Bit(ncr_slot *np, u_char write_bit, u_char *gpreg);
static void Tnvram_Stop(ncr_slot *np, u_char *gpreg);
static void Tnvram_Clk(ncr_slot *np, u_char *gpreg);

static int __init ncr_get_Tekram_nvram (ncr_slot *np, Tekram_nvram *nvram)
{
        u_char gpcntl, gpreg;
        u_char old_gpcntl, old_gpreg;
        u_short csum;

        /* save current state of GPCNTL and GPREG */
        old_gpreg       = INB (nc_gpreg);
        old_gpcntl      = INB (nc_gpcntl);

        /* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
           1/2/4 out */
        gpreg = old_gpreg & 0xe9;
        OUTB (nc_gpreg, gpreg);
        gpcntl = (old_gpcntl & 0xe9) | 0x09;
        OUTB (nc_gpcntl, gpcntl);

        /* input all of NVRAM, 64 words */
        csum = Tnvram_read_data(np, (u_short *) nvram,
                        sizeof(*nvram) / sizeof(short), &gpreg);
        
        /* return GPIO0/1/2/4 to original states after having accessed NVRAM */
        OUTB (nc_gpcntl, old_gpcntl);
        OUTB (nc_gpreg,  old_gpreg);

        /* check data valid */
        if (csum != 0x1234)
                return 1;

        return 0;
}

/*
 * Read Tekram NvRAM data and compute checksum.
 */
static u_short __init Tnvram_read_data(ncr_slot *np, u_short *data, int len,
                                       u_char *gpreg)
{
        u_char  read_bit;
        u_short csum;
        int     x;

        for (x = 0, csum = 0; x < len; x++)  {

                /* output read command and address */
                Tnvram_Send_Command(np, 0x180 | x, &read_bit, gpreg);
                if (read_bit & 0x01)
                        return 0; /* Force bad checksum */

                Tnvram_Read_Word(np, &data[x], gpreg);
                csum += data[x];

                Tnvram_Stop(np, gpreg);
        }

        return csum;
}

/*
 * Send read command and address to NVRAM
 */
static void __init Tnvram_Send_Command(ncr_slot *np, u_short write_data,
                                       u_char *read_bit, u_char *gpreg)
{
        int x;

        /* send 9 bits, start bit (1), command (2), address (6)  */
        for (x = 0; x < 9; x++)
                Tnvram_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);

        *read_bit = INB (nc_gpreg);
}

/*
 * READ a byte from the NVRAM
 */
static void __init Tnvram_Read_Word(ncr_slot *np, u_short *nvram_data, 
                                    u_char *gpreg)
{
        int x;
        u_char read_bit;

        *nvram_data = 0;
        for (x = 0; x < 16; x++) {
                Tnvram_Read_Bit(np, &read_bit, gpreg);

                if (read_bit & 0x01)
                        *nvram_data |=  (0x01 << (15 - x));
                else
                        *nvram_data &= ~(0x01 << (15 - x));
        }
}

/* 
 * Read bit from NVRAM
 */
static void __init Tnvram_Read_Bit(ncr_slot *np, u_char *read_bit,
                                   u_char *gpreg)
{
        UDELAY (2);
        Tnvram_Clk(np, gpreg);
        *read_bit = INB (nc_gpreg);
}

/*
 * Write bit to GPIO0
 */
static void __init Tnvram_Write_Bit(ncr_slot *np, u_char write_bit,
                                    u_char *gpreg)
{
        if (write_bit & 0x01)
                *gpreg |= 0x02;
        else
                *gpreg &= 0xfd;
                
        *gpreg |= 0x10;
                
        OUTB (nc_gpreg, *gpreg);
        UDELAY (2);

        Tnvram_Clk(np, gpreg);
}

/*
 * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
 */
static void __init Tnvram_Stop(ncr_slot *np, u_char *gpreg)
{
        *gpreg &= 0xef;
        OUTB (nc_gpreg, *gpreg);
        UDELAY (2);

        Tnvram_Clk(np, gpreg);
}

/*
 * Pulse clock bit in GPIO0
 */
static void __init Tnvram_Clk(ncr_slot *np, u_char *gpreg)
{
        OUTB (nc_gpreg, *gpreg | 0x04);
        UDELAY (2);
        OUTB (nc_gpreg, *gpreg);
}

#endif  /* SCSI_NCR_NVRAM_SUPPORT */

/*
**      Module stuff
*/

#ifdef MODULE
Scsi_Host_Template driver_template = NCR53C8XX;
#include "scsi_module.c"
#endif