[MIPS] Fix kgdb exception handler from user mode.

[linux-2.6/linux-mips.git] / drivers / parisc / lba_pci.c

/*
**
**  PCI Lower Bus Adapter (LBA) manager
**
**      (c) Copyright 1999,2000 Grant Grundler
**      (c) Copyright 1999,2000 Hewlett-Packard Company
**
**      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 module primarily provides access to PCI bus (config/IOport
** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class
** with 4 digit model numbers - eg C3000 (and A400...sigh).
**
** LBA driver isn't as simple as the Dino driver because:
**   (a) this chip has substantial bug fixes between revisions
**       (Only one Dino bug has a software workaround :^(  )
**   (b) has more options which we don't (yet) support (DMA hints, OLARD)
**   (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)
**   (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).
**       (dino only deals with "Legacy" PDC)
**
** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.
** (I/O SAPIC is integratd in the LBA chip).
**
** FIXME: Add support to SBA and LBA drivers for DMA hint sets
** FIXME: Add support for PCI card hot-plug (OLARD).
*/

#include <linux/delay.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/init.h>         /* for __init and __devinit */
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>

#include <asm/byteorder.h>
#include <asm/pdc.h>
#include <asm/pdcpat.h>
#include <asm/page.h>
#include <asm/system.h>

#include <asm/hardware.h>       /* for register_parisc_driver() stuff */
#include <asm/parisc-device.h>
#include <asm/iosapic.h>        /* for iosapic_register() */
#include <asm/io.h>             /* read/write stuff */

#undef DEBUG_LBA        /* general stuff */
#undef DEBUG_LBA_PORT   /* debug I/O Port access */
#undef DEBUG_LBA_CFG    /* debug Config Space Access (ie PCI Bus walk) */
#undef DEBUG_LBA_PAT    /* debug PCI Resource Mgt code - PDC PAT only */

#undef FBB_SUPPORT      /* Fast Back-Back xfers - NOT READY YET */


#ifdef DEBUG_LBA
#define DBG(x...)       printk(x)
#else
#define DBG(x...)
#endif

#ifdef DEBUG_LBA_PORT
#define DBG_PORT(x...)  printk(x)
#else
#define DBG_PORT(x...)
#endif

#ifdef DEBUG_LBA_CFG
#define DBG_CFG(x...)   printk(x)
#else
#define DBG_CFG(x...)
#endif

#ifdef DEBUG_LBA_PAT
#define DBG_PAT(x...)   printk(x)
#else
#define DBG_PAT(x...)
#endif


/*
** Config accessor functions only pass in the 8-bit bus number and not
** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus
** number based on what firmware wrote into the scratch register.
**
** The "secondary" bus number is set to this before calling
** pci_register_ops(). If any PPB's are present, the scan will
** discover them and update the "secondary" and "subordinate"
** fields in the pci_bus structure.
**
** Changes in the configuration *may* result in a different
** bus number for each LBA depending on what firmware does.
*/

#define MODULE_NAME "LBA"

#define LBA_FUNC_ID     0x0000  /* function id */
#define LBA_FCLASS      0x0008  /* function class, bist, header, rev... */
#define LBA_CAPABLE     0x0030  /* capabilities register */

#define LBA_PCI_CFG_ADDR        0x0040  /* poke CFG address here */
#define LBA_PCI_CFG_DATA        0x0048  /* read or write data here */

#define LBA_PMC_MTLT    0x0050  /* Firmware sets this - read only. */
#define LBA_FW_SCRATCH  0x0058  /* Firmware writes the PCI bus number here. */
#define LBA_ERROR_ADDR  0x0070  /* On error, address gets logged here */

#define LBA_ARB_MASK    0x0080  /* bit 0 enable arbitration. PAT/PDC enables */
#define LBA_ARB_PRI     0x0088  /* firmware sets this. */
#define LBA_ARB_MODE    0x0090  /* firmware sets this. */
#define LBA_ARB_MTLT    0x0098  /* firmware sets this. */

#define LBA_MOD_ID      0x0100  /* Module ID. PDC_PAT_CELL reports 4 */

#define LBA_STAT_CTL    0x0108  /* Status & Control */
#define   LBA_BUS_RESET         0x01    /*  Deassert PCI Bus Reset Signal */
#define   CLEAR_ERRLOG          0x10    /*  "Clear Error Log" cmd */
#define   CLEAR_ERRLOG_ENABLE   0x20    /*  "Clear Error Log" Enable */
#define   HF_ENABLE     0x40    /*    enable HF mode (default is -1 mode) */

#define LBA_LMMIO_BASE  0x0200  /* < 4GB I/O address range */
#define LBA_LMMIO_MASK  0x0208

#define LBA_GMMIO_BASE  0x0210  /* > 4GB I/O address range */
#define LBA_GMMIO_MASK  0x0218

#define LBA_WLMMIO_BASE 0x0220  /* All < 4GB ranges under the same *SBA* */
#define LBA_WLMMIO_MASK 0x0228

#define LBA_WGMMIO_BASE 0x0230  /* All > 4GB ranges under the same *SBA* */
#define LBA_WGMMIO_MASK 0x0238

#define LBA_IOS_BASE    0x0240  /* I/O port space for this LBA */
#define LBA_IOS_MASK    0x0248

#define LBA_ELMMIO_BASE 0x0250  /* Extra LMMIO range */
#define LBA_ELMMIO_MASK 0x0258

#define LBA_EIOS_BASE   0x0260  /* Extra I/O port space */
#define LBA_EIOS_MASK   0x0268

#define LBA_GLOBAL_MASK 0x0270  /* Mercury only: Global Address Mask */
#define LBA_DMA_CTL     0x0278  /* firmware sets this */

#define LBA_IBASE       0x0300  /* SBA DMA support */
#define LBA_IMASK       0x0308

/* FIXME: ignore DMA Hint stuff until we can measure performance */
#define LBA_HINT_CFG    0x0310
#define LBA_HINT_BASE   0x0380  /* 14 registers at every 8 bytes. */

#define LBA_BUS_MODE    0x0620

/* ERROR regs are needed for config cycle kluges */
#define LBA_ERROR_CONFIG 0x0680
#define     LBA_SMART_MODE 0x20
#define LBA_ERROR_STATUS 0x0688
#define LBA_ROPE_CTL     0x06A0

#define LBA_IOSAPIC_BASE        0x800 /* Offset of IRQ logic */

/* non-postable I/O port space, densely packed */
#define LBA_PORT_BASE   (PCI_F_EXTEND | 0xfee00000UL)
static void __iomem *astro_iop_base __read_mostly;

#define ELROY_HVERS     0x782
#define MERCURY_HVERS   0x783
#define QUICKSILVER_HVERS       0x784

static inline int IS_ELROY(struct parisc_device *d)
{
        return (d->id.hversion == ELROY_HVERS);
}

static inline int IS_MERCURY(struct parisc_device *d)
{
        return (d->id.hversion == MERCURY_HVERS);
}

static inline int IS_QUICKSILVER(struct parisc_device *d)
{
        return (d->id.hversion == QUICKSILVER_HVERS);
}


/*
** lba_device: Per instance Elroy data structure
*/
struct lba_device {
        struct pci_hba_data hba;

        spinlock_t      lba_lock;
        void            *iosapic_obj;

#ifdef CONFIG_64BIT
        void __iomem *  iop_base;    /* PA_VIEW - for IO port accessor funcs */
#endif

        int             flags;       /* state/functionality enabled */
        int             hw_rev;      /* HW revision of chip */
};


static u32 lba_t32;

/* lba flags */
#define LBA_FLAG_SKIP_PROBE     0x10

#define LBA_SKIP_PROBE(d) ((d)->flags & LBA_FLAG_SKIP_PROBE)


/* Looks nice and keeps the compiler happy */
#define LBA_DEV(d) ((struct lba_device *) (d))


/*
** Only allow 8 subsidiary busses per LBA
** Problem is the PCI bus numbering is globally shared.
*/
#define LBA_MAX_NUM_BUSES 8

/************************************
 * LBA register read and write support
 *
 * BE WARNED: register writes are posted.
 *  (ie follow writes which must reach HW with a read)
 */
#define READ_U8(addr)  __raw_readb(addr)
#define READ_U16(addr) __raw_readw(addr)
#define READ_U32(addr) __raw_readl(addr)
#define WRITE_U8(value, addr)  __raw_writeb(value, addr)
#define WRITE_U16(value, addr) __raw_writew(value, addr)
#define WRITE_U32(value, addr) __raw_writel(value, addr)

#define READ_REG8(addr)  readb(addr)
#define READ_REG16(addr) readw(addr)
#define READ_REG32(addr) readl(addr)
#define READ_REG64(addr) readq(addr)
#define WRITE_REG8(value, addr)  writeb(value, addr)
#define WRITE_REG16(value, addr) writew(value, addr)
#define WRITE_REG32(value, addr) writel(value, addr)


#define LBA_CFG_TOK(bus,dfn) ((u32) ((bus)<<16 | (dfn)<<8))
#define LBA_CFG_BUS(tok)  ((u8) ((tok)>>16))
#define LBA_CFG_DEV(tok)  ((u8) ((tok)>>11) & 0x1f)
#define LBA_CFG_FUNC(tok) ((u8) ((tok)>>8 ) & 0x7)


/*
** Extract LBA (Rope) number from HPA
** REVISIT: 16 ropes for Stretch/Ike?
*/
#define ROPES_PER_IOC   8
#define LBA_NUM(x)    ((((unsigned long) x) >> 13) & (ROPES_PER_IOC-1))


static void
lba_dump_res(struct resource *r, int d)
{
        int i;

        if (NULL == r)
                return;

        printk(KERN_DEBUG "(%p)", r->parent);
        for (i = d; i ; --i) printk(" ");
        printk(KERN_DEBUG "%p [%lx,%lx]/%lx\n", r, r->start, r->end, r->flags);
        lba_dump_res(r->child, d+2);
        lba_dump_res(r->sibling, d);
}


/*
** LBA rev 2.0, 2.1, 2.2, and 3.0 bus walks require a complex
** workaround for cfg cycles:
**      -- preserve  LBA state
**      -- prevent any DMA from occurring
**      -- turn on smart mode
**      -- probe with config writes before doing config reads
**      -- check ERROR_STATUS
**      -- clear ERROR_STATUS
**      -- restore LBA state
**
** The workaround is only used for device discovery.
*/

static int lba_device_present(u8 bus, u8 dfn, struct lba_device *d)
{
        u8 first_bus = d->hba.hba_bus->secondary;
        u8 last_sub_bus = d->hba.hba_bus->subordinate;

        if ((bus < first_bus) ||
            (bus > last_sub_bus) ||
            ((bus - first_bus) >= LBA_MAX_NUM_BUSES)) {
                return 0;
        }

        return 1;
}



#define LBA_CFG_SETUP(d, tok) {                         \
    /* Save contents of error config register.  */                      \
    error_config = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);             \
\
    /* Save contents of status control register.  */                    \
    status_control = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);               \
\
    /* For LBA rev 2.0, 2.1, 2.2, and 3.0, we must disable DMA          \
    ** arbitration for full bus walks.                                  \
    */                                                                  \
        /* Save contents of arb mask register. */                       \
        arb_mask = READ_REG32(d->hba.base_addr + LBA_ARB_MASK);         \
\
        /*                                                              \
         * Turn off all device arbitration bits (i.e. everything        \
         * except arbitration enable bit).                              \
         */                                                             \
        WRITE_REG32(0x1, d->hba.base_addr + LBA_ARB_MASK);              \
\
    /*                                                                  \
     * Set the smart mode bit so that master aborts don't cause         \
     * LBA to go into PCI fatal mode (required).                        \
     */                                                                 \
    WRITE_REG32(error_config | LBA_SMART_MODE, d->hba.base_addr + LBA_ERROR_CONFIG);    \
}


#define LBA_CFG_PROBE(d, tok) {                         \
    /*                                                                  \
     * Setup Vendor ID write and read back the address register         \
     * to make sure that LBA is the bus master.                         \
     */                                                                 \
    WRITE_REG32(tok | PCI_VENDOR_ID, (d)->hba.base_addr + LBA_PCI_CFG_ADDR);\
    /*                                                                  \
     * Read address register to ensure that LBA is the bus master,      \
     * which implies that DMA traffic has stopped when DMA arb is off.  \
     */                                                                 \
    lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
    /*                                                                  \
     * Generate a cfg write cycle (will have no affect on               \
     * Vendor ID register since read-only).                             \
     */                                                                 \
    WRITE_REG32(~0, (d)->hba.base_addr + LBA_PCI_CFG_DATA);             \
    /*                                                                  \
     * Make sure write has completed before proceeding further,         \
     * i.e. before setting clear enable.                                \
     */                                                                 \
    lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
}


/*
 * HPREVISIT:
 *   -- Can't tell if config cycle got the error.
 *
 *              OV bit is broken until rev 4.0, so can't use OV bit and
 *              LBA_ERROR_LOG_ADDR to tell if error belongs to config cycle.
 *
 *              As of rev 4.0, no longer need the error check.
 *
 *   -- Even if we could tell, we still want to return -1
 *      for **ANY** error (not just master abort).
 *
 *   -- Only clear non-fatal errors (we don't want to bring
 *      LBA out of pci-fatal mode).
 *
 *              Actually, there is still a race in which
 *              we could be clearing a fatal error.  We will
 *              live with this during our initial bus walk
 *              until rev 4.0 (no driver activity during
 *              initial bus walk).  The initial bus walk
 *              has race conditions concerning the use of
 *              smart mode as well.
 */

#define LBA_MASTER_ABORT_ERROR 0xc
#define LBA_FATAL_ERROR 0x10

#define LBA_CFG_MASTER_ABORT_CHECK(d, base, tok, error) {               \
    u32 error_status = 0;                                               \
    /*                                                                  \
     * Set clear enable (CE) bit. Unset by HW when new                  \
     * errors are logged -- LBA HW ERS section 14.3.3).         \
     */                                                                 \
    WRITE_REG32(status_control | CLEAR_ERRLOG_ENABLE, base + LBA_STAT_CTL); \
    error_status = READ_REG32(base + LBA_ERROR_STATUS);         \
    if ((error_status & 0x1f) != 0) {                                   \
        /*                                                              \
         * Fail the config read request.                                \
         */                                                             \
        error = 1;                                                      \
        if ((error_status & LBA_FATAL_ERROR) == 0) {                    \
            /*                                                          \
             * Clear error status (if fatal bit not set) by setting     \
             * clear error log bit (CL).                                \
             */                                                         \
            WRITE_REG32(status_control | CLEAR_ERRLOG, base + LBA_STAT_CTL); \
        }                                                               \
    }                                                                   \
}

#define LBA_CFG_TR4_ADDR_SETUP(d, addr)                                 \
        WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);

#define LBA_CFG_ADDR_SETUP(d, addr) {                                   \
    WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);  \
    /*                                                                  \
     * Read address register to ensure that LBA is the bus master,      \
     * which implies that DMA traffic has stopped when DMA arb is off.  \
     */                                                                 \
    lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
}


#define LBA_CFG_RESTORE(d, base) {                                      \
    /*                                                                  \
     * Restore status control register (turn off clear enable).         \
     */                                                                 \
    WRITE_REG32(status_control, base + LBA_STAT_CTL);                   \
    /*                                                                  \
     * Restore error config register (turn off smart mode).             \
     */                                                                 \
    WRITE_REG32(error_config, base + LBA_ERROR_CONFIG);                 \
        /*                                                              \
         * Restore arb mask register (reenables DMA arbitration).       \
         */                                                             \
        WRITE_REG32(arb_mask, base + LBA_ARB_MASK);                     \
}



static unsigned int
lba_rd_cfg(struct lba_device *d, u32 tok, u8 reg, u32 size)
{
        u32 data = ~0U;
        int error = 0;
        u32 arb_mask = 0;       /* used by LBA_CFG_SETUP/RESTORE */
        u32 error_config = 0;   /* used by LBA_CFG_SETUP/RESTORE */
        u32 status_control = 0; /* used by LBA_CFG_SETUP/RESTORE */

        LBA_CFG_SETUP(d, tok);
        LBA_CFG_PROBE(d, tok);
        LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
        if (!error) {
                void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;

                LBA_CFG_ADDR_SETUP(d, tok | reg);
                switch (size) {
                case 1: data = (u32) READ_REG8(data_reg + (reg & 3)); break;
                case 2: data = (u32) READ_REG16(data_reg+ (reg & 2)); break;
                case 4: data = READ_REG32(data_reg); break;
                }
        }
        LBA_CFG_RESTORE(d, d->hba.base_addr);
        return(data);
}


static int elroy_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
{
        struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 tok = LBA_CFG_TOK(local_bus, devfn);
        void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;

        if ((pos > 255) || (devfn > 255))
                return -EINVAL;

/* FIXME: B2K/C3600 workaround is always use old method... */
        /* if (!LBA_SKIP_PROBE(d)) */ {
                /* original - Generate config cycle on broken elroy
                  with risk we will miss PCI bus errors. */
                *data = lba_rd_cfg(d, tok, pos, size);
                DBG_CFG("%s(%x+%2x) -> 0x%x (a)\n", __FUNCTION__, tok, pos, *data);
                return 0;
        }

        if (LBA_SKIP_PROBE(d) && !lba_device_present(bus->secondary, devfn, d)) {
                DBG_CFG("%s(%x+%2x) -> -1 (b)\n", __FUNCTION__, tok, pos);
                /* either don't want to look or know device isn't present. */
                *data = ~0U;
                return(0);
        }

        /* Basic Algorithm
        ** Should only get here on fully working LBA rev.
        ** This is how simple the code should have been.
        */
        LBA_CFG_ADDR_SETUP(d, tok | pos);
        switch(size) {
        case 1: *data = READ_REG8 (data_reg + (pos & 3)); break;
        case 2: *data = READ_REG16(data_reg + (pos & 2)); break;
        case 4: *data = READ_REG32(data_reg); break;
        }
        DBG_CFG("%s(%x+%2x) -> 0x%x (c)\n", __FUNCTION__, tok, pos, *data);
        return 0;
}


static void
lba_wr_cfg(struct lba_device *d, u32 tok, u8 reg, u32 data, u32 size)
{
        int error = 0;
        u32 arb_mask = 0;
        u32 error_config = 0;
        u32 status_control = 0;
        void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;

        LBA_CFG_SETUP(d, tok);
        LBA_CFG_ADDR_SETUP(d, tok | reg);
        switch (size) {
        case 1: WRITE_REG8 (data, data_reg + (reg & 3)); break;
        case 2: WRITE_REG16(data, data_reg + (reg & 2)); break;
        case 4: WRITE_REG32(data, data_reg);             break;
        }
        LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
        LBA_CFG_RESTORE(d, d->hba.base_addr);
}


/*
 * LBA 4.0 config write code implements non-postable semantics
 * by doing a read of CONFIG ADDR after the write.
 */

static int elroy_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
{
        struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 tok = LBA_CFG_TOK(local_bus,devfn);

        if ((pos > 255) || (devfn > 255))
                return -EINVAL;

        if (!LBA_SKIP_PROBE(d)) {
                /* Original Workaround */
                lba_wr_cfg(d, tok, pos, (u32) data, size);
                DBG_CFG("%s(%x+%2x) = 0x%x (a)\n", __FUNCTION__, tok, pos,data);
                return 0;
        }

        if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->secondary, devfn, d))) {
                DBG_CFG("%s(%x+%2x) = 0x%x (b)\n", __FUNCTION__, tok, pos,data);
                return 1; /* New Workaround */
        }

        DBG_CFG("%s(%x+%2x) = 0x%x (c)\n", __FUNCTION__, tok, pos, data);

        /* Basic Algorithm */
        LBA_CFG_ADDR_SETUP(d, tok | pos);
        switch(size) {
        case 1: WRITE_REG8 (data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 3));
                   break;
        case 2: WRITE_REG16(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 2));
                   break;
        case 4: WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
                   break;
        }
        /* flush posted write */
        lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
        return 0;
}


static struct pci_ops elroy_cfg_ops = {
        .read =         elroy_cfg_read,
        .write =        elroy_cfg_write,
};

/*
 * The mercury_cfg_ops are slightly misnamed; they're also used for Elroy
 * TR4.0 as no additional bugs were found in this areea between Elroy and
 * Mercury
 */

static int mercury_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
{
        struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 tok = LBA_CFG_TOK(local_bus, devfn);
        void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;

        if ((pos > 255) || (devfn > 255))
                return -EINVAL;

        LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
        switch(size) {
        case 1:
                *data = READ_REG8(data_reg + (pos & 3));
                break;
        case 2:
                *data = READ_REG16(data_reg + (pos & 2));
                break;
        case 4:
                *data = READ_REG32(data_reg);             break;
                break;
        }

        DBG_CFG("mercury_cfg_read(%x+%2x) -> 0x%x\n", tok, pos, *data);
        return 0;
}

/*
 * LBA 4.0 config write code implements non-postable semantics
 * by doing a read of CONFIG ADDR after the write.
 */

static int mercury_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
{
        struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
        void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 tok = LBA_CFG_TOK(local_bus,devfn);

        if ((pos > 255) || (devfn > 255))
                return -EINVAL;

        DBG_CFG("%s(%x+%2x) <- 0x%x (c)\n", __FUNCTION__, tok, pos, data);

        LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
        switch(size) {
        case 1:
                WRITE_REG8 (data, data_reg + (pos & 3));
                break;
        case 2:
                WRITE_REG16(data, data_reg + (pos & 2));
                break;
        case 4:
                WRITE_REG32(data, data_reg);
                break;
        }

        /* flush posted write */
        lba_t32 = READ_U32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
        return 0;
}

static struct pci_ops mercury_cfg_ops = {
        .read =         mercury_cfg_read,
        .write =        mercury_cfg_write,
};


static void
lba_bios_init(void)
{
        DBG(MODULE_NAME ": lba_bios_init\n");
}


#ifdef CONFIG_64BIT

/*
** Determine if a device is already configured.
** If so, reserve it resources.
**
** Read PCI cfg command register and see if I/O or MMIO is enabled.
** PAT has to enable the devices it's using.
**
** Note: resources are fixed up before we try to claim them.
*/
static void
lba_claim_dev_resources(struct pci_dev *dev)
{
        u16 cmd;
        int i, srch_flags;

        (void) pci_read_config_word(dev, PCI_COMMAND, &cmd);

        srch_flags  = (cmd & PCI_COMMAND_IO) ? IORESOURCE_IO : 0;
        if (cmd & PCI_COMMAND_MEMORY)
                srch_flags |= IORESOURCE_MEM;

        if (!srch_flags)
                return;

        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
                if (dev->resource[i].flags & srch_flags) {
                        pci_claim_resource(dev, i);
                        DBG("   claimed %s %d [%lx,%lx]/%lx\n",
                                pci_name(dev), i,
                                dev->resource[i].start,
                                dev->resource[i].end,
                                dev->resource[i].flags
                                );
                }
        }
}


/*
 * truncate_pat_collision:  Deal with overlaps or outright collisions
 *                      between PAT PDC reported ranges.
 *
 *   Broken PA8800 firmware will report lmmio range that
 *   overlaps with CPU HPA. Just truncate the lmmio range.
 *
 *   BEWARE: conflicts with this lmmio range may be an
 *   elmmio range which is pointing down another rope.
 *
 *  FIXME: only deals with one collision per range...theoretically we
 *  could have several. Supporting more than one collision will get messy.
 */
static unsigned long
truncate_pat_collision(struct resource *root, struct resource *new)
{
        unsigned long start = new->start;
        unsigned long end = new->end;
        struct resource *tmp = root->child;

        if (end <= start || start < root->start || !tmp)
                return 0;

        /* find first overlap */
        while (tmp && tmp->end < start)
                tmp = tmp->sibling;

        /* no entries overlap */
        if (!tmp)  return 0;

        /* found one that starts behind the new one
        ** Don't need to do anything.
        */
        if (tmp->start >= end) return 0;

        if (tmp->start <= start) {
                /* "front" of new one overlaps */
                new->start = tmp->end + 1;

                if (tmp->end >= end) {
                        /* AACCKK! totally overlaps! drop this range. */
                        return 1;
                }
        } 

        if (tmp->end < end ) {
                /* "end" of new one overlaps */
                new->end = tmp->start - 1;
        }

        printk(KERN_WARNING "LBA: Truncating lmmio_space [%lx/%lx] "
                                        "to [%lx,%lx]\n",
                        start, end,
                        new->start, new->end );

        return 0;       /* truncation successful */
}

#else
#define lba_claim_dev_resources(dev) do { } while (0)
#define truncate_pat_collision(r,n)  (0)
#endif

/*
** The algorithm is generic code.
** But it needs to access local data structures to get the IRQ base.
** Could make this a "pci_fixup_irq(bus, region)" but not sure
** it's worth it.
**
** Called by do_pci_scan_bus() immediately after each PCI bus is walked.
** Resources aren't allocated until recursive buswalk below HBA is completed.
*/
static void
lba_fixup_bus(struct pci_bus *bus)
{
        struct list_head *ln;
#ifdef FBB_SUPPORT
        u16 status;
#endif
        struct lba_device *ldev = LBA_DEV(parisc_walk_tree(bus->bridge));
        int lba_portbase = HBA_PORT_BASE(ldev->hba.hba_num);

        DBG("lba_fixup_bus(0x%p) bus %d platform_data 0x%p\n",
                bus, bus->secondary, bus->bridge->platform_data);

        /*
        ** Properly Setup MMIO resources for this bus.
        ** pci_alloc_primary_bus() mangles this.
        */
        if (bus->self) {
                /* PCI-PCI Bridge */
                pci_read_bridge_bases(bus);
        } else {
                /* Host-PCI Bridge */
                int err, i;

                DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
                        ldev->hba.io_space.name,
                        ldev->hba.io_space.start, ldev->hba.io_space.end,
                        ldev->hba.io_space.flags);
                DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
                        ldev->hba.lmmio_space.name,
                        ldev->hba.lmmio_space.start, ldev->hba.lmmio_space.end,
                        ldev->hba.lmmio_space.flags);

                err = request_resource(&ioport_resource, &(ldev->hba.io_space));
                if (err < 0) {
                        lba_dump_res(&ioport_resource, 2);
                        BUG();
                }
                /* advertize Host bridge resources to PCI bus */
                bus->resource[0] = &(ldev->hba.io_space);
                i = 1;

                if (ldev->hba.elmmio_space.start) {
                        err = request_resource(&iomem_resource,
                                        &(ldev->hba.elmmio_space));
                        if (err < 0) {

                                printk("FAILED: lba_fixup_bus() request for "
                                                "elmmio_space [%lx/%lx]\n",
                                                ldev->hba.elmmio_space.start,
                                                ldev->hba.elmmio_space.end);

                                /* lba_dump_res(&iomem_resource, 2); */
                                /* BUG(); */
                        } else
                                bus->resource[i++] = &(ldev->hba.elmmio_space);
                }


                /*   Overlaps with elmmio can (and should) fail here.
                 *   We will prune (or ignore) the distributed range.
                 *
                 *   FIXME: SBA code should register all elmmio ranges first.
                 *      that would take care of elmmio ranges routed
                 *      to a different rope (already discovered) from
                 *      getting registered *after* LBA code has already
                 *      registered it's distributed lmmio range.
                 */
                if (truncate_pat_collision(&iomem_resource,
                                        &(ldev->hba.lmmio_space))) {

                        printk(KERN_WARNING "LBA: lmmio_space [%lx/%lx] duplicate!\n",
                                        ldev->hba.lmmio_space.start,
                                        ldev->hba.lmmio_space.end);
                } else {
                        err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
                        if (err < 0) {
                                printk(KERN_ERR "FAILED: lba_fixup_bus() request for "
                                        "lmmio_space [%lx/%lx]\n",
                                        ldev->hba.lmmio_space.start,
                                        ldev->hba.lmmio_space.end);
                        } else
                                bus->resource[i++] = &(ldev->hba.lmmio_space);
                }

#ifdef CONFIG_64BIT
                /* GMMIO is  distributed range. Every LBA/Rope gets part it. */
                if (ldev->hba.gmmio_space.flags) {
                        err = request_resource(&iomem_resource, &(ldev->hba.gmmio_space));
                        if (err < 0) {
                                printk("FAILED: lba_fixup_bus() request for "
                                        "gmmio_space [%lx/%lx]\n",
                                        ldev->hba.gmmio_space.start,
                                        ldev->hba.gmmio_space.end);
                                lba_dump_res(&iomem_resource, 2);
                                BUG();
                        }
                        bus->resource[i++] = &(ldev->hba.gmmio_space);
                }
#endif

        }

        list_for_each(ln, &bus->devices) {
                int i;
                struct pci_dev *dev = pci_dev_b(ln);

                DBG("lba_fixup_bus() %s\n", pci_name(dev));

                /* Virtualize Device/Bridge Resources. */
                for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
                        struct resource *res = &dev->resource[i];

                        /* If resource not allocated - skip it */
                        if (!res->start)
                                continue;

                        if (res->flags & IORESOURCE_IO) {
                                DBG("lba_fixup_bus() I/O Ports [%lx/%lx] -> ",
                                        res->start, res->end);
                                res->start |= lba_portbase;
                                res->end   |= lba_portbase;
                                DBG("[%lx/%lx]\n", res->start, res->end);
                        } else if (res->flags & IORESOURCE_MEM) {
                                /*
                                ** Convert PCI (IO_VIEW) addresses to
                                ** processor (PA_VIEW) addresses
                                 */
                                DBG("lba_fixup_bus() MMIO [%lx/%lx] -> ",
                                        res->start, res->end);
                                res->start = PCI_HOST_ADDR(HBA_DATA(ldev), res->start);
                                res->end   = PCI_HOST_ADDR(HBA_DATA(ldev), res->end);
                                DBG("[%lx/%lx]\n", res->start, res->end);
                        } else {
                                DBG("lba_fixup_bus() WTF? 0x%lx [%lx/%lx] XXX",
                                        res->flags, res->start, res->end);
                        }
                }

#ifdef FBB_SUPPORT
                /*
                ** If one device does not support FBB transfers,
                ** No one on the bus can be allowed to use them.
                */
                (void) pci_read_config_word(dev, PCI_STATUS, &status);
                bus->bridge_ctl &= ~(status & PCI_STATUS_FAST_BACK);
#endif

                if (is_pdc_pat()) {
                        /* Claim resources for PDC's devices */
                        lba_claim_dev_resources(dev);
                }

                /*
                ** P2PB's have no IRQs. ignore them.
                */
                if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
                        continue;

                /* Adjust INTERRUPT_LINE for this dev */
                iosapic_fixup_irq(ldev->iosapic_obj, dev);
        }

#ifdef FBB_SUPPORT
/* FIXME/REVISIT - finish figuring out to set FBB on both
** pci_setup_bridge() clobbers PCI_BRIDGE_CONTROL.
** Can't fixup here anyway....garr...
*/
        if (fbb_enable) {
                if (bus->self) {
                        u8 control;
                        /* enable on PPB */
                        (void) pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &control);
                        (void) pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, control | PCI_STATUS_FAST_BACK);

                } else {
                        /* enable on LBA */
                }
                fbb_enable = PCI_COMMAND_FAST_BACK;
        }

        /* Lastly enable FBB/PERR/SERR on all devices too */
        list_for_each(ln, &bus->devices) {
                (void) pci_read_config_word(dev, PCI_COMMAND, &status);
                status |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR | fbb_enable;
                (void) pci_write_config_word(dev, PCI_COMMAND, status);
        }
#endif
}


struct pci_bios_ops lba_bios_ops = {
        .init =         lba_bios_init,
        .fixup_bus =    lba_fixup_bus,
};




/*******************************************************
**
** LBA Sprockets "I/O Port" Space Accessor Functions
**
** This set of accessor functions is intended for use with
** "legacy firmware" (ie Sprockets on Allegro/Forte boxes).
**
** Many PCI devices don't require use of I/O port space (eg Tulip,
** NCR720) since they export the same registers to both MMIO and
** I/O port space. In general I/O port space is slower than
** MMIO since drivers are designed so PIO writes can be posted.
**
********************************************************/

#define LBA_PORT_IN(size, mask) \
static u##size lba_astro_in##size (struct pci_hba_data *d, u16 addr) \
{ \
        u##size t; \
        t = READ_REG##size(astro_iop_base + addr); \
        DBG_PORT(" 0x%x\n", t); \
        return (t); \
}

LBA_PORT_IN( 8, 3)
LBA_PORT_IN(16, 2)
LBA_PORT_IN(32, 0)



/*
** BUG X4107:  Ordering broken - DMA RD return can bypass PIO WR
**
** Fixed in Elroy 2.2. The READ_U32(..., LBA_FUNC_ID) below is
** guarantee non-postable completion semantics - not avoid X4107.
** The READ_U32 only guarantees the write data gets to elroy but
** out to the PCI bus. We can't read stuff from I/O port space
** since we don't know what has side-effects. Attempting to read
** from configuration space would be suicidal given the number of
** bugs in that elroy functionality.
**
**      Description:
**          DMA read results can improperly pass PIO writes (X4107).  The
**          result of this bug is that if a processor modifies a location in
**          memory after having issued PIO writes, the PIO writes are not
**          guaranteed to be completed before a PCI device is allowed to see
**          the modified data in a DMA read.
**
**          Note that IKE bug X3719 in TR1 IKEs will result in the same
**          symptom.
**
**      Workaround:
**          The workaround for this bug is to always follow a PIO write with
**          a PIO read to the same bus before starting DMA on that PCI bus.
**
*/
#define LBA_PORT_OUT(size, mask) \
static void lba_astro_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
{ \
        DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __FUNCTION__, d, addr, val); \
        WRITE_REG##size(val, astro_iop_base + addr); \
        if (LBA_DEV(d)->hw_rev < 3) \
                lba_t32 = READ_U32(d->base_addr + LBA_FUNC_ID); \
}

LBA_PORT_OUT( 8, 3)
LBA_PORT_OUT(16, 2)
LBA_PORT_OUT(32, 0)


static struct pci_port_ops lba_astro_port_ops = {
        .inb =  lba_astro_in8,
        .inw =  lba_astro_in16,
        .inl =  lba_astro_in32,
        .outb = lba_astro_out8,
        .outw = lba_astro_out16,
        .outl = lba_astro_out32
};


#ifdef CONFIG_64BIT
#define PIOP_TO_GMMIO(lba, addr) \
        ((lba)->iop_base + (((addr)&0xFFFC)<<10) + ((addr)&3))

/*******************************************************
**
** LBA PAT "I/O Port" Space Accessor Functions
**
** This set of accessor functions is intended for use with
** "PAT PDC" firmware (ie Prelude/Rhapsody/Piranha boxes).
**
** This uses the PIOP space located in the first 64MB of GMMIO.
** Each rope gets a full 64*KB* (ie 4 bytes per page) this way.
** bits 1:0 stay the same.  bits 15:2 become 25:12.
** Then add the base and we can generate an I/O Port cycle.
********************************************************/
#undef LBA_PORT_IN
#define LBA_PORT_IN(size, mask) \
static u##size lba_pat_in##size (struct pci_hba_data *l, u16 addr) \
{ \
        u##size t; \
        DBG_PORT("%s(0x%p, 0x%x) ->", __FUNCTION__, l, addr); \
        t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr)); \
        DBG_PORT(" 0x%x\n", t); \
        return (t); \
}

LBA_PORT_IN( 8, 3)
LBA_PORT_IN(16, 2)
LBA_PORT_IN(32, 0)


#undef LBA_PORT_OUT
#define LBA_PORT_OUT(size, mask) \
static void lba_pat_out##size (struct pci_hba_data *l, u16 addr, u##size val) \
{ \
        void *where = (void *) PIOP_TO_GMMIO(LBA_DEV(l), addr); \
        DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __FUNCTION__, l, addr, val); \
        WRITE_REG##size(val, where); \
        /* flush the I/O down to the elroy at least */ \
        lba_t32 = READ_U32(l->base_addr + LBA_FUNC_ID); \
}

LBA_PORT_OUT( 8, 3)
LBA_PORT_OUT(16, 2)
LBA_PORT_OUT(32, 0)


static struct pci_port_ops lba_pat_port_ops = {
        .inb =  lba_pat_in8,
        .inw =  lba_pat_in16,
        .inl =  lba_pat_in32,
        .outb = lba_pat_out8,
        .outw = lba_pat_out16,
        .outl = lba_pat_out32
};



/*
** make range information from PDC available to PCI subsystem.
** We make the PDC call here in order to get the PCI bus range
** numbers. The rest will get forwarded in pcibios_fixup_bus().
** We don't have a struct pci_bus assigned to us yet.
*/
static void
lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
{
        unsigned long bytecnt;
        pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;     /* PA_VIEW */
        pdc_pat_cell_mod_maddr_block_t io_pdc_cell;     /* IO_VIEW */
        long io_count;
        long status;    /* PDC return status */
        long pa_count;
        int i;

        /* return cell module (IO view) */
        status = pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
                                PA_VIEW, & pa_pdc_cell);
        pa_count = pa_pdc_cell.mod[1];

        status |= pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
                                IO_VIEW, &io_pdc_cell);
        io_count = io_pdc_cell.mod[1];

        /* We've already done this once for device discovery...*/
        if (status != PDC_OK) {
                panic("pdc_pat_cell_module() call failed for LBA!\n");
        }

        if (PAT_GET_ENTITY(pa_pdc_cell.mod_info) != PAT_ENTITY_LBA) {
                panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!\n");
        }

        /*
        ** Inspect the resources PAT tells us about
        */
        for (i = 0; i < pa_count; i++) {
                struct {
                        unsigned long type;
                        unsigned long start;
                        unsigned long end;      /* aka finish */
                } *p, *io;
                struct resource *r;

                p = (void *) &(pa_pdc_cell.mod[2+i*3]);
                io = (void *) &(io_pdc_cell.mod[2+i*3]);

                /* Convert the PAT range data to PCI "struct resource" */
                switch(p->type & 0xff) {
                case PAT_PBNUM:
                        lba_dev->hba.bus_num.start = p->start;
                        lba_dev->hba.bus_num.end   = p->end;
                        break;

                case PAT_LMMIO:
                        /* used to fix up pre-initialized MEM BARs */
                        if (!lba_dev->hba.lmmio_space.start) {
                                sprintf(lba_dev->hba.lmmio_name,
                                                "PCI%02lx LMMIO",
                                                lba_dev->hba.bus_num.start);
                                lba_dev->hba.lmmio_space_offset = p->start -
                                        io->start;
                                r = &lba_dev->hba.lmmio_space;
                                r->name = lba_dev->hba.lmmio_name;
                        } else if (!lba_dev->hba.elmmio_space.start) {
                                sprintf(lba_dev->hba.elmmio_name,
                                                "PCI%02lx ELMMIO",
                                                lba_dev->hba.bus_num.start);
                                r = &lba_dev->hba.elmmio_space;
                                r->name = lba_dev->hba.elmmio_name;
                        } else {
                                printk(KERN_WARNING MODULE_NAME
                                        " only supports 2 LMMIO resources!\n");
                                break;
                        }

                        r->start  = p->start;
                        r->end    = p->end;
                        r->flags  = IORESOURCE_MEM;
                        r->parent = r->sibling = r->child = NULL;
                        break;

                case PAT_GMMIO:
                        /* MMIO space > 4GB phys addr; for 64-bit BAR */
                        sprintf(lba_dev->hba.gmmio_name, "PCI%02lx GMMIO",
                                        lba_dev->hba.bus_num.start);
                        r = &lba_dev->hba.gmmio_space;
                        r->name  = lba_dev->hba.gmmio_name;
                        r->start  = p->start;
                        r->end    = p->end;
                        r->flags  = IORESOURCE_MEM;
                        r->parent = r->sibling = r->child = NULL;
                        break;

                case PAT_NPIOP:
                        printk(KERN_WARNING MODULE_NAME
                                " range[%d] : ignoring NPIOP (0x%lx)\n",
                                i, p->start);
                        break;

                case PAT_PIOP:
                        /*
                        ** Postable I/O port space is per PCI host adapter.
                        ** base of 64MB PIOP region
                        */
                        lba_dev->iop_base = ioremap_nocache(p->start, 64 * 1024 * 1024);

                        sprintf(lba_dev->hba.io_name, "PCI%02lx Ports",
                                        lba_dev->hba.bus_num.start);
                        r = &lba_dev->hba.io_space;
                        r->name  = lba_dev->hba.io_name;
                        r->start  = HBA_PORT_BASE(lba_dev->hba.hba_num);
                        r->end    = r->start + HBA_PORT_SPACE_SIZE - 1;
                        r->flags  = IORESOURCE_IO;
                        r->parent = r->sibling = r->child = NULL;
                        break;

                default:
                        printk(KERN_WARNING MODULE_NAME
                                " range[%d] : unknown pat range type (0x%lx)\n",
                                i, p->type & 0xff);
                        break;
                }
        }
}
#else
/* keep compiler from complaining about missing declarations */
#define lba_pat_port_ops lba_astro_port_ops
#define lba_pat_resources(pa_dev, lba_dev)
#endif  /* CONFIG_64BIT */


extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
extern void sba_directed_lmmio(struct parisc_device *, struct resource *);


static void
lba_legacy_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
{
        struct resource *r;
        int lba_num;

        lba_dev->hba.lmmio_space_offset = PCI_F_EXTEND;

        /*
        ** With "legacy" firmware, the lowest byte of FW_SCRATCH
        ** represents bus->secondary and the second byte represents
        ** bus->subsidiary (i.e. highest PPB programmed by firmware).
        ** PCI bus walk *should* end up with the same result.
        ** FIXME: But we don't have sanity checks in PCI or LBA.
        */
        lba_num = READ_REG32(lba_dev->hba.base_addr + LBA_FW_SCRATCH);
        r = &(lba_dev->hba.bus_num);
        r->name = "LBA PCI Busses";
        r->start = lba_num & 0xff;
        r->end = (lba_num>>8) & 0xff;

        /* Set up local PCI Bus resources - we don't need them for
        ** Legacy boxes but it's nice to see in /proc/iomem.
        */
        r = &(lba_dev->hba.lmmio_space);
        sprintf(lba_dev->hba.lmmio_name, "PCI%02lx LMMIO",
                                        lba_dev->hba.bus_num.start);
        r->name  = lba_dev->hba.lmmio_name;

#if 1
        /* We want the CPU -> IO routing of addresses.
         * The SBA BASE/MASK registers control CPU -> IO routing.
         * Ask SBA what is routed to this rope/LBA.
         */
        sba_distributed_lmmio(pa_dev, r);
#else
        /*
         * The LBA BASE/MASK registers control IO -> System routing.
         *
         * The following code works but doesn't get us what we want.
         * Well, only because firmware (v5.0) on C3000 doesn't program
         * the LBA BASE/MASE registers to be the exact inverse of 
         * the corresponding SBA registers. Other Astro/Pluto
         * based platform firmware may do it right.
         *
         * Should someone want to mess with MSI, they may need to
         * reprogram LBA BASE/MASK registers. Thus preserve the code
         * below until MSI is known to work on C3000/A500/N4000/RP3440.
         *
         * Using the code below, /proc/iomem shows:
         * ...
         * f0000000-f0ffffff : PCI00 LMMIO
         *   f05d0000-f05d0000 : lcd_data
         *   f05d0008-f05d0008 : lcd_cmd
         * f1000000-f1ffffff : PCI01 LMMIO
         * f4000000-f4ffffff : PCI02 LMMIO
         *   f4000000-f4001fff : sym53c8xx
         *   f4002000-f4003fff : sym53c8xx
         *   f4004000-f40043ff : sym53c8xx
         *   f4005000-f40053ff : sym53c8xx
         *   f4007000-f4007fff : ohci_hcd
         *   f4008000-f40083ff : tulip
         * f6000000-f6ffffff : PCI03 LMMIO
         * f8000000-fbffffff : PCI00 ELMMIO
         *   fa100000-fa4fffff : stifb mmio
         *   fb000000-fb1fffff : stifb fb
         *
         * But everything listed under PCI02 actually lives under PCI00.
         * This is clearly wrong.
         *
         * Asking SBA how things are routed tells the correct story:
         * LMMIO_BASE/MASK/ROUTE f4000001 fc000000 00000000
         * DIR0_BASE/MASK/ROUTE fa000001 fe000000 00000006
         * DIR1_BASE/MASK/ROUTE f9000001 ff000000 00000004
         * DIR2_BASE/MASK/ROUTE f0000000 fc000000 00000000
         * DIR3_BASE/MASK/ROUTE f0000000 fc000000 00000000
         *
         * Which looks like this in /proc/iomem:
         * f4000000-f47fffff : PCI00 LMMIO
         *   f4000000-f4001fff : sym53c8xx
         *   ...[deteled core devices - same as above]...
         *   f4008000-f40083ff : tulip
         * f4800000-f4ffffff : PCI01 LMMIO
         * f6000000-f67fffff : PCI02 LMMIO
         * f7000000-f77fffff : PCI03 LMMIO
         * f9000000-f9ffffff : PCI02 ELMMIO
         * fa000000-fbffffff : PCI03 ELMMIO
         *   fa100000-fa4fffff : stifb mmio
         *   fb000000-fb1fffff : stifb fb
         *
         * ie all Built-in core are under now correctly under PCI00.
         * The "PCI02 ELMMIO" directed range is for:
         *  +-[02]---03.0  3Dfx Interactive, Inc. Voodoo 2
         *
         * All is well now.
         */
        r->start = READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_BASE);
        if (r->start & 1) {
                unsigned long rsize;

                r->flags = IORESOURCE_MEM;
                /* mmio_mask also clears Enable bit */
                r->start &= mmio_mask;
                r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
                rsize = ~ READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_MASK);

                /*
                ** Each rope only gets part of the distributed range.
                ** Adjust "window" for this rope.
                */
                rsize /= ROPES_PER_IOC;
                r->start += (rsize + 1) * LBA_NUM(pa_dev->hpa.start);
                r->end = r->start + rsize;
        } else {
                r->end = r->start = 0;  /* Not enabled. */
        }
#endif

        /*
        ** "Directed" ranges are used when the "distributed range" isn't
        ** sufficient for all devices below a given LBA.  Typically devices
        ** like graphics cards or X25 may need a directed range when the
        ** bus has multiple slots (ie multiple devices) or the device
        ** needs more than the typical 4 or 8MB a distributed range offers.
        **
        ** The main reason for ignoring it now frigging complications.
        ** Directed ranges may overlap (and have precedence) over
        ** distributed ranges. Or a distributed range assigned to a unused
        ** rope may be used by a directed range on a different rope.
        ** Support for graphics devices may require fixing this
        ** since they may be assigned a directed range which overlaps
        ** an existing (but unused portion of) distributed range.
        */
        r = &(lba_dev->hba.elmmio_space);
        sprintf(lba_dev->hba.elmmio_name, "PCI%02lx ELMMIO",
                                        lba_dev->hba.bus_num.start);
        r->name  = lba_dev->hba.elmmio_name;

#if 1
        /* See comment which precedes call to sba_directed_lmmio() */
        sba_directed_lmmio(pa_dev, r);
#else
        r->start = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_BASE);

        if (r->start & 1) {
                unsigned long rsize;
                r->flags = IORESOURCE_MEM;
                /* mmio_mask also clears Enable bit */
                r->start &= mmio_mask;
                r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
                rsize = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_MASK);
                r->end = r->start + ~rsize;
        }
#endif

        r = &(lba_dev->hba.io_space);
        sprintf(lba_dev->hba.io_name, "PCI%02lx Ports",
                                        lba_dev->hba.bus_num.start);
        r->name  = lba_dev->hba.io_name;
        r->flags = IORESOURCE_IO;
        r->start = READ_REG32(lba_dev->hba.base_addr + LBA_IOS_BASE) & ~1L;
        r->end   = r->start + (READ_REG32(lba_dev->hba.base_addr + LBA_IOS_MASK) ^ (HBA_PORT_SPACE_SIZE - 1));

        /* Virtualize the I/O Port space ranges */
        lba_num = HBA_PORT_BASE(lba_dev->hba.hba_num);
        r->start |= lba_num;
        r->end   |= lba_num;
}


/**************************************************************************
**
**   LBA initialization code (HW and SW)
**
**   o identify LBA chip itself
**   o initialize LBA chip modes (HardFail)
**   o FIXME: initialize DMA hints for reasonable defaults
**   o enable configuration functions
**   o call pci_register_ops() to discover devs (fixup/fixup_bus get invoked)
**
**************************************************************************/

static int __init
lba_hw_init(struct lba_device *d)
{
        u32 stat;
        u32 bus_reset;  /* PDC_PAT_BUG */

#if 0
        printk(KERN_DEBUG "LBA %lx  STAT_CTL %Lx  ERROR_CFG %Lx  STATUS %Lx DMA_CTL %Lx\n",
                d->hba.base_addr,
                READ_REG64(d->hba.base_addr + LBA_STAT_CTL),
                READ_REG64(d->hba.base_addr + LBA_ERROR_CONFIG),
                READ_REG64(d->hba.base_addr + LBA_ERROR_STATUS),
                READ_REG64(d->hba.base_addr + LBA_DMA_CTL) );
        printk(KERN_DEBUG "     ARB mask %Lx  pri %Lx  mode %Lx  mtlt %Lx\n",
                READ_REG64(d->hba.base_addr + LBA_ARB_MASK),
                READ_REG64(d->hba.base_addr + LBA_ARB_PRI),
                READ_REG64(d->hba.base_addr + LBA_ARB_MODE),
                READ_REG64(d->hba.base_addr + LBA_ARB_MTLT) );
        printk(KERN_DEBUG "     HINT cfg 0x%Lx\n",
                READ_REG64(d->hba.base_addr + LBA_HINT_CFG));
        printk(KERN_DEBUG "     HINT reg ");
        { int i;
        for (i=LBA_HINT_BASE; i< (14*8 + LBA_HINT_BASE); i+=8)
                printk(" %Lx", READ_REG64(d->hba.base_addr + i));
        }
        printk("\n");
#endif  /* DEBUG_LBA_PAT */

#ifdef CONFIG_64BIT
/*
 * FIXME add support for PDC_PAT_IO "Get slot status" - OLAR support
 * Only N-Class and up can really make use of Get slot status.
 * maybe L-class too but I've never played with it there.
 */
#endif

        /* PDC_PAT_BUG: exhibited in rev 40.48  on L2000 */
        bus_reset = READ_REG32(d->hba.base_addr + LBA_STAT_CTL + 4) & 1;
        if (bus_reset) {
                printk(KERN_DEBUG "NOTICE: PCI bus reset still asserted! (clearing)\n");
        }

        stat = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
        if (stat & LBA_SMART_MODE) {
                printk(KERN_DEBUG "NOTICE: LBA in SMART mode! (cleared)\n");
                stat &= ~LBA_SMART_MODE;
                WRITE_REG32(stat, d->hba.base_addr + LBA_ERROR_CONFIG);
        }

        /* Set HF mode as the default (vs. -1 mode). */
        stat = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
        WRITE_REG32(stat | HF_ENABLE, d->hba.base_addr + LBA_STAT_CTL);

        /*
        ** Writing a zero to STAT_CTL.rf (bit 0) will clear reset signal
        ** if it's not already set. If we just cleared the PCI Bus Reset
        ** signal, wait a bit for the PCI devices to recover and setup.
        */
        if (bus_reset)
                mdelay(pci_post_reset_delay);

        if (0 == READ_REG32(d->hba.base_addr + LBA_ARB_MASK)) {
                /*
                ** PDC_PAT_BUG: PDC rev 40.48 on L2000.
                ** B2000/C3600/J6000 also have this problem?
                ** 
                ** Elroys with hot pluggable slots don't get configured
                ** correctly if the slot is empty.  ARB_MASK is set to 0
                ** and we can't master transactions on the bus if it's
                ** not at least one. 0x3 enables elroy and first slot.
                */
                printk(KERN_DEBUG "NOTICE: Enabling PCI Arbitration\n");
                WRITE_REG32(0x3, d->hba.base_addr + LBA_ARB_MASK);
        }

        /*
        ** FIXME: Hint registers are programmed with default hint
        ** values by firmware. Hints should be sane even if we
        ** can't reprogram them the way drivers want.
        */
        return 0;
}



/*
** Determine if lba should claim this chip (return 0) or not (return 1).
** If so, initialize the chip and tell other partners in crime they
** have work to do.
*/
static int __init
lba_driver_probe(struct parisc_device *dev)
{
        struct lba_device *lba_dev;
        struct pci_bus *lba_bus;
        struct pci_ops *cfg_ops;
        u32 func_class;
        void *tmp_obj;
        char *version;
        void __iomem *addr = ioremap_nocache(dev->hpa.start, 4096);

        /* Read HW Rev First */
        func_class = READ_REG32(addr + LBA_FCLASS);

        if (IS_ELROY(dev)) {    
                func_class &= 0xf;
                switch (func_class) {
                case 0: version = "TR1.0"; break;
                case 1: version = "TR2.0"; break;
                case 2: version = "TR2.1"; break;
                case 3: version = "TR2.2"; break;
                case 4: version = "TR3.0"; break;
                case 5: version = "TR4.0"; break;
                default: version = "TR4+";
                }

                printk(KERN_INFO "%s version %s (0x%x) found at 0x%lx\n",
                        MODULE_NAME, version, func_class & 0xf, dev->hpa.start);

                if (func_class < 2) {
                        printk(KERN_WARNING "Can't support LBA older than "
                                "TR2.1 - continuing under adversity.\n");
                }

#if 0
/* Elroy TR4.0 should work with simple algorithm.
   But it doesn't.  Still missing something. *sigh*
*/
                if (func_class > 4) {
                        cfg_ops = &mercury_cfg_ops;
                } else
#endif
                {
                        cfg_ops = &elroy_cfg_ops;
                }

        } else if (IS_MERCURY(dev) || IS_QUICKSILVER(dev)) {
                func_class &= 0xff;
                version = kmalloc(6, GFP_KERNEL);
                snprintf(version, 6, "TR%d.%d",(func_class >> 4),(func_class & 0xf));
                /* We could use one printk for both Elroy and Mercury,
                 * but for the mask for func_class.
                 */ 
                printk(KERN_INFO "%s version %s (0x%x) found at 0x%lx\n",
                       MODULE_NAME, version, func_class & 0xff, dev->hpa.start);
                cfg_ops = &mercury_cfg_ops;
        } else {
                printk(KERN_ERR "Unknown LBA found at 0x%lx\n", dev->hpa.start);
                return -ENODEV;
        }

        /*
        ** Tell I/O SAPIC driver we have a IRQ handler/region.
        */
        tmp_obj = iosapic_register(dev->hpa.start + LBA_IOSAPIC_BASE);

        /* NOTE: PCI devices (e.g. 103c:1005 graphics card) which don't
        **      have an IRT entry will get NULL back from iosapic code.
        */
        
        lba_dev = kzalloc(sizeof(struct lba_device), GFP_KERNEL);
        if (!lba_dev) {
                printk(KERN_ERR "lba_init_chip - couldn't alloc lba_device\n");
                return(1);
        }


        /* ---------- First : initialize data we already have --------- */

        lba_dev->hw_rev = func_class;
        lba_dev->hba.base_addr = addr;
        lba_dev->hba.dev = dev;
        lba_dev->iosapic_obj = tmp_obj;  /* save interrupt handle */
        lba_dev->hba.iommu = sba_get_iommu(dev);  /* get iommu data */

        /* ------------ Second : initialize common stuff ---------- */
        pci_bios = &lba_bios_ops;
        pcibios_register_hba(HBA_DATA(lba_dev));
        spin_lock_init(&lba_dev->lba_lock);

        if (lba_hw_init(lba_dev))
                return(1);

        /* ---------- Third : setup I/O Port and MMIO resources  --------- */

        if (is_pdc_pat()) {
                /* PDC PAT firmware uses PIOP region of GMMIO space. */
                pci_port = &lba_pat_port_ops;
                /* Go ask PDC PAT what resources this LBA has */
                lba_pat_resources(dev, lba_dev);
        } else {
                if (!astro_iop_base) {
                        /* Sprockets PDC uses NPIOP region */
                        astro_iop_base = ioremap_nocache(LBA_PORT_BASE, 64 * 1024);
                        pci_port = &lba_astro_port_ops;
                }

                /* Poke the chip a bit for /proc output */
                lba_legacy_resources(dev, lba_dev);
        }

        /* 
        ** Tell PCI support another PCI bus was found.
        ** Walks PCI bus for us too.
        */
        dev->dev.platform_data = lba_dev;
        lba_bus = lba_dev->hba.hba_bus =
                pci_scan_bus_parented(&dev->dev, lba_dev->hba.bus_num.start,
                                cfg_ops, NULL);
        if (lba_bus)
                pci_bus_add_devices(lba_bus);

        /* This is in lieu of calling pci_assign_unassigned_resources() */
        if (is_pdc_pat()) {
                /* assign resources to un-initialized devices */

                DBG_PAT("LBA pci_bus_size_bridges()\n");
                pci_bus_size_bridges(lba_bus);

                DBG_PAT("LBA pci_bus_assign_resources()\n");
                pci_bus_assign_resources(lba_bus);

#ifdef DEBUG_LBA_PAT
                DBG_PAT("\nLBA PIOP resource tree\n");
                lba_dump_res(&lba_dev->hba.io_space, 2);
                DBG_PAT("\nLBA LMMIO resource tree\n");
                lba_dump_res(&lba_dev->hba.lmmio_space, 2);
#endif
        }
        pci_enable_bridges(lba_bus);


        /*
        ** Once PCI register ops has walked the bus, access to config
        ** space is restricted. Avoids master aborts on config cycles.
        ** Early LBA revs go fatal on *any* master abort.
        */
        if (cfg_ops == &elroy_cfg_ops) {
                lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
        }

        /* Whew! Finally done! Tell services we got this one covered. */
        return 0;
}

static struct parisc_device_id lba_tbl[] = {
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, ELROY_HVERS, 0xa },
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, MERCURY_HVERS, 0xa },
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, QUICKSILVER_HVERS, 0xa },
        { 0, }
};

static struct parisc_driver lba_driver = {
        .name =         MODULE_NAME,
        .id_table =     lba_tbl,
        .probe =        lba_driver_probe,
};

/*
** One time initialization to let the world know the LBA was found.
** Must be called exactly once before pci_init().
*/
void __init lba_init(void)
{
        register_parisc_driver(&lba_driver);
}

/*
** Initialize the IBASE/IMASK registers for LBA (Elroy).
** Only called from sba_iommu.c in order to route ranges (MMIO vs DMA).
** sba_iommu is responsible for locking (none needed at init time).
*/
void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask)
{
        void __iomem * base_addr = ioremap_nocache(lba->hpa.start, 4096);

        imask <<= 2;    /* adjust for hints - 2 more bits */

        /* Make sure we aren't trying to set bits that aren't writeable. */
        WARN_ON((ibase & 0x001fffff) != 0);
        WARN_ON((imask & 0x001fffff) != 0);
        
        DBG("%s() ibase 0x%x imask 0x%x\n", __FUNCTION__, ibase, imask);
        WRITE_REG32( imask, base_addr + LBA_IMASK);
        WRITE_REG32( ibase, base_addr + LBA_IBASE);
        iounmap(base_addr);
}