radix-tree: fix small lockless radix-tree bug

[linux-2.6/pdupreez.git] / drivers / parisc / dino.c

/*
**      DINO manager
**
**      (c) Copyright 1999 Red Hat Software
**      (c) Copyright 1999 SuSE GmbH
**      (c) Copyright 1999,2000 Hewlett-Packard Company
**      (c) Copyright 2000 Grant Grundler
**      (c) Copyright 2006 Helge Deller
**
**      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 provides access to Dino PCI bus (config/IOport spaces)
**      and helps manage Dino IRQ lines.
**
**      Dino interrupt handling is a bit complicated.
**      Dino always writes to the broadcast EIR via irr0 for now.
**      (BIG WARNING: using broadcast EIR is a really bad thing for SMP!)
**      Only one processor interrupt is used for the 11 IRQ line 
**      inputs to dino.
**
**      The different between Built-in Dino and Card-Mode
**      dino is in chip initialization and pci device initialization.
**
**      Linux drivers can only use Card-Mode Dino if pci devices I/O port
**      BARs are configured and used by the driver. Programming MMIO address 
**      requires substantial knowledge of available Host I/O address ranges
**      is currently not supported.  Port/Config accessor functions are the
**      same. "BIOS" differences are handled within the existing routines.
*/

/*      Changes :
**      2001-06-14 : Clement Moyroud (moyroudc@esiee.fr)
**              - added support for the integrated RS232.       
*/

/*
** TODO: create a virtual address for each Dino HPA.
**       GSC code might be able to do this since IODC data tells us
**       how many pages are used. PCI subsystem could (must?) do this
**       for PCI drivers devices which implement/use MMIO registers.
*/

#include <linux/delay.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>    /* for struct irqaction */
#include <linux/spinlock.h>     /* for spinlock_t and prototypes */

#include <asm/pdc.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/hardware.h>

#include "gsc.h"

#undef DINO_DEBUG

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

/*
** Config accessor functions only pass in the 8-bit bus number
** and not the 8-bit "PCI Segment" number. Each Dino will be
** assigned a PCI bus number based on "when" it's discovered.
**
** The "secondary" bus number is set to this before calling
** pci_scan_bus(). If any PPB's are present, the scan will
** discover them and update the "secondary" and "subordinate"
** fields in Dino's pci_bus structure.
**
** Changes in the configuration *will* result in a different
** bus number for each dino.
*/

#define is_card_dino(id)        ((id)->hw_type == HPHW_A_DMA)
#define is_cujo(id)             ((id)->hversion == 0x682)

#define DINO_IAR0               0x004
#define DINO_IODC_ADDR          0x008
#define DINO_IODC_DATA_0        0x008
#define DINO_IODC_DATA_1        0x008
#define DINO_IRR0               0x00C
#define DINO_IAR1               0x010
#define DINO_IRR1               0x014
#define DINO_IMR                0x018
#define DINO_IPR                0x01C
#define DINO_TOC_ADDR           0x020
#define DINO_ICR                0x024
#define DINO_ILR                0x028
#define DINO_IO_COMMAND         0x030
#define DINO_IO_STATUS          0x034
#define DINO_IO_CONTROL         0x038
#define DINO_IO_GSC_ERR_RESP    0x040
#define DINO_IO_ERR_INFO        0x044
#define DINO_IO_PCI_ERR_RESP    0x048
#define DINO_IO_FBB_EN          0x05c
#define DINO_IO_ADDR_EN         0x060
#define DINO_PCI_ADDR           0x064
#define DINO_CONFIG_DATA        0x068
#define DINO_IO_DATA            0x06c
#define DINO_MEM_DATA           0x070   /* Dino 3.x only */
#define DINO_GSC2X_CONFIG       0x7b4
#define DINO_GMASK              0x800
#define DINO_PAMR               0x804
#define DINO_PAPR               0x808
#define DINO_DAMODE             0x80c
#define DINO_PCICMD             0x810
#define DINO_PCISTS             0x814
#define DINO_MLTIM              0x81c
#define DINO_BRDG_FEAT          0x820
#define DINO_PCIROR             0x824
#define DINO_PCIWOR             0x828
#define DINO_TLTIM              0x830

#define DINO_IRQS 11            /* bits 0-10 are architected */
#define DINO_IRR_MASK   0x5ff   /* only 10 bits are implemented */
#define DINO_LOCAL_IRQS (DINO_IRQS+1)

#define DINO_MASK_IRQ(x)        (1<<(x))

#define PCIINTA   0x001
#define PCIINTB   0x002
#define PCIINTC   0x004
#define PCIINTD   0x008
#define PCIINTE   0x010
#define PCIINTF   0x020
#define GSCEXTINT 0x040
/* #define xxx       0x080 - bit 7 is "default" */
/* #define xxx    0x100 - bit 8 not used */
/* #define xxx    0x200 - bit 9 not used */
#define RS232INT  0x400

struct dino_device
{
        struct pci_hba_data     hba;    /* 'C' inheritance - must be first */
        spinlock_t              dinosaur_pen;
        unsigned long           txn_addr; /* EIR addr to generate interrupt */ 
        u32                     txn_data; /* EIR data assign to each dino */ 
        u32                     imr;      /* IRQ's which are enabled */ 
        int                     global_irq[DINO_LOCAL_IRQS]; /* map IMR bit to global irq */
#ifdef DINO_DEBUG
        unsigned int            dino_irr0; /* save most recent IRQ line stat */
#endif
};

/* Looks nice and keeps the compiler happy */
#define DINO_DEV(d) ((struct dino_device *) d)


/*
 * Dino Configuration Space Accessor Functions
 */

#define DINO_CFG_TOK(bus,dfn,pos) ((u32) ((bus)<<16 | (dfn)<<8 | (pos)))

/*
 * keep the current highest bus count to assist in allocating busses.  This
 * tries to keep a global bus count total so that when we discover an 
 * entirely new bus, it can be given a unique bus number.
 */
static int dino_current_bus = 0;

static int dino_cfg_read(struct pci_bus *bus, unsigned int devfn, int where,
                int size, u32 *val)
{
        struct dino_device *d = DINO_DEV(parisc_walk_tree(bus->bridge));
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 v = DINO_CFG_TOK(local_bus, devfn, where & ~3);
        void __iomem *base_addr = d->hba.base_addr;
        unsigned long flags;

        DBG("%s: %p, %d, %d, %d\n", __func__, base_addr, devfn, where,
                                                                        size);
        spin_lock_irqsave(&d->dinosaur_pen, flags);

        /* tell HW which CFG address */
        __raw_writel(v, base_addr + DINO_PCI_ADDR);

        /* generate cfg read cycle */
        if (size == 1) {
                *val = readb(base_addr + DINO_CONFIG_DATA + (where & 3));
        } else if (size == 2) {
                *val = readw(base_addr + DINO_CONFIG_DATA + (where & 2));
        } else if (size == 4) {
                *val = readl(base_addr + DINO_CONFIG_DATA);
        }

        spin_unlock_irqrestore(&d->dinosaur_pen, flags);
        return 0;
}

/*
 * Dino address stepping "feature":
 * When address stepping, Dino attempts to drive the bus one cycle too soon
 * even though the type of cycle (config vs. MMIO) might be different. 
 * The read of Ven/Prod ID is harmless and avoids Dino's address stepping.
 */
static int dino_cfg_write(struct pci_bus *bus, unsigned int devfn, int where,
        int size, u32 val)
{
        struct dino_device *d = DINO_DEV(parisc_walk_tree(bus->bridge));
        u32 local_bus = (bus->parent == NULL) ? 0 : bus->secondary;
        u32 v = DINO_CFG_TOK(local_bus, devfn, where & ~3);
        void __iomem *base_addr = d->hba.base_addr;
        unsigned long flags;

        DBG("%s: %p, %d, %d, %d\n", __func__, base_addr, devfn, where,
                                                                        size);
        spin_lock_irqsave(&d->dinosaur_pen, flags);

        /* avoid address stepping feature */
        __raw_writel(v & 0xffffff00, base_addr + DINO_PCI_ADDR);
        __raw_readl(base_addr + DINO_CONFIG_DATA);

        /* tell HW which CFG address */
        __raw_writel(v, base_addr + DINO_PCI_ADDR);
        /* generate cfg read cycle */
        if (size == 1) {
                writeb(val, base_addr + DINO_CONFIG_DATA + (where & 3));
        } else if (size == 2) {
                writew(val, base_addr + DINO_CONFIG_DATA + (where & 2));
        } else if (size == 4) {
                writel(val, base_addr + DINO_CONFIG_DATA);
        }

        spin_unlock_irqrestore(&d->dinosaur_pen, flags);
        return 0;
}

static struct pci_ops dino_cfg_ops = {
        .read =         dino_cfg_read,
        .write =        dino_cfg_write,
};


/*
 * Dino "I/O Port" Space Accessor Functions
 *
 * 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.  Performance is going to stink if drivers use
 * I/O port instead of MMIO.
 */

#define DINO_PORT_IN(type, size, mask) \
static u##size dino_in##size (struct pci_hba_data *d, u16 addr) \
{ \
        u##size v; \
        unsigned long flags; \
        spin_lock_irqsave(&(DINO_DEV(d)->dinosaur_pen), flags); \
        /* tell HW which IO Port address */ \
        __raw_writel((u32) addr, d->base_addr + DINO_PCI_ADDR); \
        /* generate I/O PORT read cycle */ \
        v = read##type(d->base_addr+DINO_IO_DATA+(addr&mask)); \
        spin_unlock_irqrestore(&(DINO_DEV(d)->dinosaur_pen), flags); \
        return v; \
}

DINO_PORT_IN(b,  8, 3)
DINO_PORT_IN(w, 16, 2)
DINO_PORT_IN(l, 32, 0)

#define DINO_PORT_OUT(type, size, mask) \
static void dino_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
{ \
        unsigned long flags; \
        spin_lock_irqsave(&(DINO_DEV(d)->dinosaur_pen), flags); \
        /* tell HW which IO port address */ \
        __raw_writel((u32) addr, d->base_addr + DINO_PCI_ADDR); \
        /* generate cfg write cycle */ \
        write##type(val, d->base_addr+DINO_IO_DATA+(addr&mask)); \
        spin_unlock_irqrestore(&(DINO_DEV(d)->dinosaur_pen), flags); \
}

DINO_PORT_OUT(b,  8, 3)
DINO_PORT_OUT(w, 16, 2)
DINO_PORT_OUT(l, 32, 0)

struct pci_port_ops dino_port_ops = {
        .inb    = dino_in8,
        .inw    = dino_in16,
        .inl    = dino_in32,
        .outb   = dino_out8,
        .outw   = dino_out16,
        .outl   = dino_out32
};

static void dino_disable_irq(unsigned int irq)
{
        struct dino_device *dino_dev = irq_desc[irq].chip_data;
        int local_irq = gsc_find_local_irq(irq, dino_dev->global_irq, DINO_LOCAL_IRQS);

        DBG(KERN_WARNING "%s(0x%p, %d)\n", __func__, dino_dev, irq);

        /* Clear the matching bit in the IMR register */
        dino_dev->imr &= ~(DINO_MASK_IRQ(local_irq));
        __raw_writel(dino_dev->imr, dino_dev->hba.base_addr+DINO_IMR);
}

static void dino_enable_irq(unsigned int irq)
{
        struct dino_device *dino_dev = irq_desc[irq].chip_data;
        int local_irq = gsc_find_local_irq(irq, dino_dev->global_irq, DINO_LOCAL_IRQS);
        u32 tmp;

        DBG(KERN_WARNING "%s(0x%p, %d)\n", __func__, dino_dev, irq);

        /*
        ** clear pending IRQ bits
        **
        ** This does NOT change ILR state!
        ** See comment below for ILR usage.
        */
        __raw_readl(dino_dev->hba.base_addr+DINO_IPR);

        /* set the matching bit in the IMR register */
        dino_dev->imr |= DINO_MASK_IRQ(local_irq);      /* used in dino_isr() */
        __raw_writel( dino_dev->imr, dino_dev->hba.base_addr+DINO_IMR);

        /* Emulate "Level Triggered" Interrupt
        ** Basically, a driver is blowing it if the IRQ line is asserted
        ** while the IRQ is disabled.  But tulip.c seems to do that....
        ** Give 'em a kluge award and a nice round of applause!
        **
        ** The gsc_write will generate an interrupt which invokes dino_isr().
        ** dino_isr() will read IPR and find nothing. But then catch this
        ** when it also checks ILR.
        */
        tmp = __raw_readl(dino_dev->hba.base_addr+DINO_ILR);
        if (tmp & DINO_MASK_IRQ(local_irq)) {
                DBG(KERN_WARNING "%s(): IRQ asserted! (ILR 0x%x)\n",
                                __func__, tmp);
                gsc_writel(dino_dev->txn_data, dino_dev->txn_addr);
        }
}

static unsigned int dino_startup_irq(unsigned int irq)
{
        dino_enable_irq(irq);
        return 0;
}

static struct hw_interrupt_type dino_interrupt_type = {
        .typename       = "GSC-PCI",
        .startup        = dino_startup_irq,
        .shutdown       = dino_disable_irq,
        .enable         = dino_enable_irq, 
        .disable        = dino_disable_irq,
        .ack            = no_ack_irq,
        .end            = no_end_irq,
};


/*
 * Handle a Processor interrupt generated by Dino.
 *
 * ilr_loop counter is a kluge to prevent a "stuck" IRQ line from
 * wedging the CPU. Could be removed or made optional at some point.
 */
static irqreturn_t dino_isr(int irq, void *intr_dev)
{
        struct dino_device *dino_dev = intr_dev;
        u32 mask;
        int ilr_loop = 100;

        /* read and acknowledge pending interrupts */
#ifdef DINO_DEBUG
        dino_dev->dino_irr0 =
#endif
        mask = __raw_readl(dino_dev->hba.base_addr+DINO_IRR0) & DINO_IRR_MASK;

        if (mask == 0)
                return IRQ_NONE;

ilr_again:
        do {
                int local_irq = __ffs(mask);
                int irq = dino_dev->global_irq[local_irq];
                DBG(KERN_DEBUG "%s(%d, %p) mask 0x%x\n",
                        __func__, irq, intr_dev, mask);
                __do_IRQ(irq);
                mask &= ~(1 << local_irq);
        } while (mask);

        /* Support for level triggered IRQ lines.
        ** 
        ** Dropping this support would make this routine *much* faster.
        ** But since PCI requires level triggered IRQ line to share lines...
        ** device drivers may assume lines are level triggered (and not
        ** edge triggered like EISA/ISA can be).
        */
        mask = __raw_readl(dino_dev->hba.base_addr+DINO_ILR) & dino_dev->imr;
        if (mask) {
                if (--ilr_loop > 0)
                        goto ilr_again;
                printk(KERN_ERR "Dino 0x%p: stuck interrupt %d\n", 
                       dino_dev->hba.base_addr, mask);
                return IRQ_NONE;
        }
        return IRQ_HANDLED;
}

static void dino_assign_irq(struct dino_device *dino, int local_irq, int *irqp)
{
        int irq = gsc_assign_irq(&dino_interrupt_type, dino);
        if (irq == NO_IRQ)
                return;

        *irqp = irq;
        dino->global_irq[local_irq] = irq;
}

static void dino_choose_irq(struct parisc_device *dev, void *ctrl)
{
        int irq;
        struct dino_device *dino = ctrl;

        switch (dev->id.sversion) {
                case 0x00084:   irq =  8; break; /* PS/2 */
                case 0x0008c:   irq = 10; break; /* RS232 */
                case 0x00096:   irq =  8; break; /* PS/2 */
                default:        return;          /* Unknown */
        }

        dino_assign_irq(dino, irq, &dev->irq);
}


/*
 * Cirrus 6832 Cardbus reports wrong irq on RDI Tadpole PARISC Laptop (deller@gmx.de)
 * (the irqs are off-by-one, not sure yet if this is a cirrus, dino-hardware or dino-driver problem...)
 */
static void __devinit quirk_cirrus_cardbus(struct pci_dev *dev)
{
        u8 new_irq = dev->irq - 1;
        printk(KERN_INFO "PCI: Cirrus Cardbus IRQ fixup for %s, from %d to %d\n",
                        pci_name(dev), dev->irq, new_irq);
        dev->irq = new_irq;
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_6832, quirk_cirrus_cardbus );


static void __init
dino_bios_init(void)
{
        DBG("dino_bios_init\n");
}

/*
 * dino_card_setup - Set up the memory space for a Dino in card mode.
 * @bus: the bus under this dino
 *
 * Claim an 8MB chunk of unused IO space and call the generic PCI routines
 * to set up the addresses of the devices on this bus.
 */
#define _8MB 0x00800000UL
static void __init
dino_card_setup(struct pci_bus *bus, void __iomem *base_addr)
{
        int i;
        struct dino_device *dino_dev = DINO_DEV(parisc_walk_tree(bus->bridge));
        struct resource *res;
        char name[128];
        int size;

        res = &dino_dev->hba.lmmio_space;
        res->flags = IORESOURCE_MEM;
        size = scnprintf(name, sizeof(name), "Dino LMMIO (%s)", 
                         bus->bridge->bus_id);
        res->name = kmalloc(size+1, GFP_KERNEL);
        if(res->name)
                strcpy((char *)res->name, name);
        else
                res->name = dino_dev->hba.lmmio_space.name;
        

        if (ccio_allocate_resource(dino_dev->hba.dev, res, _8MB,
                                F_EXTEND(0xf0000000UL) | _8MB,
                                F_EXTEND(0xffffffffUL) &~ _8MB, _8MB) < 0) {
                struct list_head *ln, *tmp_ln;

                printk(KERN_ERR "Dino: cannot attach bus %s\n",
                       bus->bridge->bus_id);
                /* kill the bus, we can't do anything with it */
                list_for_each_safe(ln, tmp_ln, &bus->devices) {
                        struct pci_dev *dev = pci_dev_b(ln);

                        list_del(&dev->bus_list);
                }
                        
                return;
        }
        bus->resource[1] = res;
        bus->resource[0] = &(dino_dev->hba.io_space);

        /* Now tell dino what range it has */
        for (i = 1; i < 31; i++) {
                if (res->start == F_EXTEND(0xf0000000UL | (i * _8MB)))
                        break;
        }
        DBG("DINO GSC WRITE i=%d, start=%lx, dino addr = %p\n",
            i, res->start, base_addr + DINO_IO_ADDR_EN);
        __raw_writel(1 << i, base_addr + DINO_IO_ADDR_EN);
}

static void __init
dino_card_fixup(struct pci_dev *dev)
{
        u32 irq_pin;

        /*
        ** REVISIT: card-mode PCI-PCI expansion chassis do exist.
        **         Not sure they were ever productized.
        **         Die here since we'll die later in dino_inb() anyway.
        */
        if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
                panic("Card-Mode Dino: PCI-PCI Bridge not supported\n");
        }

        /*
        ** Set Latency Timer to 0xff (not a shared bus)
        ** Set CACHELINE_SIZE.
        */
        dino_cfg_write(dev->bus, dev->devfn, 
                       PCI_CACHE_LINE_SIZE, 2, 0xff00 | L1_CACHE_BYTES/4); 

        /*
        ** Program INT_LINE for card-mode devices.
        ** The cards are hardwired according to this algorithm.
        ** And it doesn't matter if PPB's are present or not since
        ** the IRQ lines bypass the PPB.
        **
        ** "-1" converts INTA-D (1-4) to PCIINTA-D (0-3) range.
        ** The additional "-1" adjusts for skewing the IRQ<->slot.
        */
        dino_cfg_read(dev->bus, dev->devfn, PCI_INTERRUPT_PIN, 1, &irq_pin); 
        dev->irq = (irq_pin + PCI_SLOT(dev->devfn) - 1) % 4 ;

        /* Shouldn't really need to do this but it's in case someone tries
        ** to bypass PCI services and look at the card themselves.
        */
        dino_cfg_write(dev->bus, dev->devfn, PCI_INTERRUPT_LINE, 1, dev->irq); 
}

/* The alignment contraints for PCI bridges under dino */
#define DINO_BRIDGE_ALIGN 0x100000


static void __init
dino_fixup_bus(struct pci_bus *bus)
{
        struct list_head *ln;
        struct pci_dev *dev;
        struct dino_device *dino_dev = DINO_DEV(parisc_walk_tree(bus->bridge));
        int port_base = HBA_PORT_BASE(dino_dev->hba.hba_num);

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

        /* Firmware doesn't set up card-mode dino, so we have to */
        if (is_card_dino(&dino_dev->hba.dev->id)) {
                dino_card_setup(bus, dino_dev->hba.base_addr);
        } else if(bus->parent == NULL) {
                /* must have a dino above it, reparent the resources
                 * into the dino window */
                int i;
                struct resource *res = &dino_dev->hba.lmmio_space;

                bus->resource[0] = &(dino_dev->hba.io_space);
                for(i = 0; i < DINO_MAX_LMMIO_RESOURCES; i++) {
                        if(res[i].flags == 0)
                                break;
                        bus->resource[i+1] = &res[i];
                }

        } else if(bus->self) {
                int i;

                pci_read_bridge_bases(bus);


                for(i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
                        if((bus->self->resource[i].flags & 
                            (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
                                continue;
                        
                        if(bus->self->resource[i].flags & IORESOURCE_MEM) {
                                /* There's a quirk to alignment of
                                 * bridge memory resources: the start
                                 * is the alignment and start-end is
                                 * the size.  However, firmware will
                                 * have assigned start and end, so we
                                 * need to take this into account */
                                bus->self->resource[i].end = bus->self->resource[i].end - bus->self->resource[i].start + DINO_BRIDGE_ALIGN;
                                bus->self->resource[i].start = DINO_BRIDGE_ALIGN;
                                
                        }
                                        
                        DBG("DEBUG %s assigning %d [0x%lx,0x%lx]\n",
                            bus->self->dev.bus_id, i,
                            bus->self->resource[i].start,
                            bus->self->resource[i].end);
                        pci_assign_resource(bus->self, i);
                        DBG("DEBUG %s after assign %d [0x%lx,0x%lx]\n",
                            bus->self->dev.bus_id, i,
                            bus->self->resource[i].start,
                            bus->self->resource[i].end);
                }
        }


        list_for_each(ln, &bus->devices) {
                int i;

                dev = pci_dev_b(ln);
                if (is_card_dino(&dino_dev->hba.dev->id))
                        dino_card_fixup(dev);

                /*
                ** P2PB's only have 2 BARs, no IRQs.
                ** I'd like to just ignore them for now.
                */
                if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
                        continue;

                /* Adjust the I/O Port space addresses */
                for (i = 0; i < PCI_NUM_RESOURCES; i++) {
                        struct resource *res = &dev->resource[i];
                        if (res->flags & IORESOURCE_IO) {
                                res->start |= port_base;
                                res->end |= port_base;
                        }
#ifdef __LP64__
                        /* Sign Extend MMIO addresses */
                        else if (res->flags & IORESOURCE_MEM) {
                                res->start |= F_EXTEND(0UL);
                                res->end   |= F_EXTEND(0UL);
                        }
#endif
                }
                /* null out the ROM resource if there is one (we don't
                 * care about an expansion rom on parisc, since it
                 * usually contains (x86) bios code) */
                dev->resource[PCI_ROM_RESOURCE].flags = 0;
                                
                if(dev->irq == 255) {

#define DINO_FIX_UNASSIGNED_INTERRUPTS
#ifdef DINO_FIX_UNASSIGNED_INTERRUPTS

                        /* This code tries to assign an unassigned
                         * interrupt.  Leave it disabled unless you
                         * *really* know what you're doing since the
                         * pin<->interrupt line mapping varies by bus
                         * and machine */

                        u32 irq_pin;
                        
                        dino_cfg_read(dev->bus, dev->devfn, 
                                      PCI_INTERRUPT_PIN, 1, &irq_pin);
                        irq_pin = (irq_pin + PCI_SLOT(dev->devfn) - 1) % 4 ;
                        printk(KERN_WARNING "Device %s has undefined IRQ, "
                                        "setting to %d\n", pci_name(dev), irq_pin);
                        dino_cfg_write(dev->bus, dev->devfn, 
                                       PCI_INTERRUPT_LINE, 1, irq_pin);
                        dino_assign_irq(dino_dev, irq_pin, &dev->irq);
#else
                        dev->irq = 65535;
                        printk(KERN_WARNING "Device %s has unassigned IRQ\n", pci_name(dev));
#endif
                } else {
                        /* Adjust INT_LINE for that busses region */
                        dino_assign_irq(dino_dev, dev->irq, &dev->irq);
                }
        }
}


struct pci_bios_ops dino_bios_ops = {
        .init           = dino_bios_init,
        .fixup_bus      = dino_fixup_bus
};


/*
 *      Initialise a DINO controller chip
 */
static void __init
dino_card_init(struct dino_device *dino_dev)
{
        u32 brdg_feat = 0x00784e05;
        unsigned long status;

        status = __raw_readl(dino_dev->hba.base_addr+DINO_IO_STATUS);
        if (status & 0x0000ff80) {
                __raw_writel(0x00000005,
                                dino_dev->hba.base_addr+DINO_IO_COMMAND);
                udelay(1);
        }

        __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_GMASK);
        __raw_writel(0x00000001, dino_dev->hba.base_addr+DINO_IO_FBB_EN);
        __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_ICR);

#if 1
/* REVISIT - should be a runtime check (eg if (CPU_IS_PCX_L) ...) */
        /*
        ** PCX-L processors don't support XQL like Dino wants it.
        ** PCX-L2 ignore XQL signal and it doesn't matter.
        */
        brdg_feat &= ~0x4;      /* UXQL */
#endif
        __raw_writel( brdg_feat, dino_dev->hba.base_addr+DINO_BRDG_FEAT);

        /*
        ** Don't enable address decoding until we know which I/O range
        ** currently is available from the host. Only affects MMIO
        ** and not I/O port space.
        */
        __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_IO_ADDR_EN);

        __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_DAMODE);
        __raw_writel(0x00222222, dino_dev->hba.base_addr+DINO_PCIROR);
        __raw_writel(0x00222222, dino_dev->hba.base_addr+DINO_PCIWOR);

        __raw_writel(0x00000040, dino_dev->hba.base_addr+DINO_MLTIM);
        __raw_writel(0x00000080, dino_dev->hba.base_addr+DINO_IO_CONTROL);
        __raw_writel(0x0000008c, dino_dev->hba.base_addr+DINO_TLTIM);

        /* Disable PAMR before writing PAPR */
        __raw_writel(0x0000007e, dino_dev->hba.base_addr+DINO_PAMR);
        __raw_writel(0x0000007f, dino_dev->hba.base_addr+DINO_PAPR);
        __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_PAMR);

        /*
        ** Dino ERS encourages enabling FBB (0x6f).
        ** We can't until we know *all* devices below us can support it.
        ** (Something in device configuration header tells us).
        */
        __raw_writel(0x0000004f, dino_dev->hba.base_addr+DINO_PCICMD);

        /* Somewhere, the PCI spec says give devices 1 second
        ** to recover from the #RESET being de-asserted.
        ** Experience shows most devices only need 10ms.
        ** This short-cut speeds up booting significantly.
        */
        mdelay(pci_post_reset_delay);
}

static int __init
dino_bridge_init(struct dino_device *dino_dev, const char *name)
{
        unsigned long io_addr;
        int result, i, count=0;
        struct resource *res, *prevres = NULL;
        /*
         * Decoding IO_ADDR_EN only works for Built-in Dino
         * since PDC has already initialized this.
         */

        io_addr = __raw_readl(dino_dev->hba.base_addr + DINO_IO_ADDR_EN);
        if (io_addr == 0) {
                printk(KERN_WARNING "%s: No PCI devices enabled.\n", name);
                return -ENODEV;
        }

        res = &dino_dev->hba.lmmio_space;
        for (i = 0; i < 32; i++) {
                unsigned long start, end;

                if((io_addr & (1 << i)) == 0)
                        continue;

                start = F_EXTEND(0xf0000000UL) | (i << 23);
                end = start + 8 * 1024 * 1024 - 1;

                DBG("DINO RANGE %d is at 0x%lx-0x%lx\n", count,
                    start, end);

                if(prevres && prevres->end + 1 == start) {
                        prevres->end = end;
                } else {
                        if(count >= DINO_MAX_LMMIO_RESOURCES) {
                                printk(KERN_ERR "%s is out of resource windows for range %d (0x%lx-0x%lx)\n", name, count, start, end);
                                break;
                        }
                        prevres = res;
                        res->start = start;
                        res->end = end;
                        res->flags = IORESOURCE_MEM;
                        res->name = kmalloc(64, GFP_KERNEL);
                        if(res->name)
                                snprintf((char *)res->name, 64, "%s LMMIO %d",
                                         name, count);
                        res++;
                        count++;
                }
        }

        res = &dino_dev->hba.lmmio_space;

        for(i = 0; i < DINO_MAX_LMMIO_RESOURCES; i++) {
                if(res[i].flags == 0)
                        break;

                result = ccio_request_resource(dino_dev->hba.dev, &res[i]);
                if (result < 0) {
                        printk(KERN_ERR "%s: failed to claim PCI Bus address space %d (0x%lx-0x%lx)!\n", name, i, res[i].start, res[i].end);
                        return result;
                }
        }
        return 0;
}

static int __init dino_common_init(struct parisc_device *dev,
                struct dino_device *dino_dev, const char *name)
{
        int status;
        u32 eim;
        struct gsc_irq gsc_irq;
        struct resource *res;

        pcibios_register_hba(&dino_dev->hba);

        pci_bios = &dino_bios_ops;   /* used by pci_scan_bus() */
        pci_port = &dino_port_ops;

        /*
        ** Note: SMP systems can make use of IRR1/IAR1 registers
        **   But it won't buy much performance except in very
        **   specific applications/configurations. Note Dino
        **   still only has 11 IRQ input lines - just map some of them
        **   to a different processor.
        */
        dev->irq = gsc_alloc_irq(&gsc_irq);
        dino_dev->txn_addr = gsc_irq.txn_addr;
        dino_dev->txn_data = gsc_irq.txn_data;
        eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;

        /* 
        ** Dino needs a PA "IRQ" to get a processor's attention.
        ** arch/parisc/kernel/irq.c returns an EIRR bit.
        */
        if (dev->irq < 0) {
                printk(KERN_WARNING "%s: gsc_alloc_irq() failed\n", name);
                return 1;
        }

        status = request_irq(dev->irq, dino_isr, 0, name, dino_dev);
        if (status) {
                printk(KERN_WARNING "%s: request_irq() failed with %d\n", 
                        name, status);
                return 1;
        }

        /* Support the serial port which is sometimes attached on built-in
         * Dino / Cujo chips.
         */

        gsc_fixup_irqs(dev, dino_dev, dino_choose_irq);

        /*
        ** This enables DINO to generate interrupts when it sees
        ** any of its inputs *change*. Just asserting an IRQ
        ** before it's enabled (ie unmasked) isn't good enough.
        */
        __raw_writel(eim, dino_dev->hba.base_addr+DINO_IAR0);

        /*
        ** Some platforms don't clear Dino's IRR0 register at boot time.
        ** Reading will clear it now.
        */
        __raw_readl(dino_dev->hba.base_addr+DINO_IRR0);

        /* allocate I/O Port resource region */
        res = &dino_dev->hba.io_space;
        if (!is_cujo(&dev->id)) {
                res->name = "Dino I/O Port";
        } else {
                res->name = "Cujo I/O Port";
        }
        res->start = HBA_PORT_BASE(dino_dev->hba.hba_num);
        res->end = res->start + (HBA_PORT_SPACE_SIZE - 1);
        res->flags = IORESOURCE_IO; /* do not mark it busy ! */
        if (request_resource(&ioport_resource, res) < 0) {
                printk(KERN_ERR "%s: request I/O Port region failed "
                       "0x%lx/%lx (hpa 0x%p)\n",
                       name, res->start, res->end, dino_dev->hba.base_addr);
                return 1;
        }

        return 0;
}

#define CUJO_RAVEN_ADDR         F_EXTEND(0xf1000000UL)
#define CUJO_FIREHAWK_ADDR      F_EXTEND(0xf1604000UL)
#define CUJO_RAVEN_BADPAGE      0x01003000UL
#define CUJO_FIREHAWK_BADPAGE   0x01607000UL

static const char *dino_vers[] = {
        "2.0",
        "2.1",
        "3.0",
        "3.1"
};

static const char *cujo_vers[] = {
        "1.0",
        "2.0"
};

void ccio_cujo20_fixup(struct parisc_device *dev, u32 iovp);

/*
** Determine if dino should claim this chip (return 0) or not (return 1).
** If so, initialize the chip appropriately (card-mode vs bridge mode).
** Much of the initialization is common though.
*/
static int __init dino_probe(struct parisc_device *dev)
{
        struct dino_device *dino_dev;   // Dino specific control struct
        const char *version = "unknown";
        char *name;
        int is_cujo = 0;
        struct pci_bus *bus;
        unsigned long hpa = dev->hpa.start;

        name = "Dino";
        if (is_card_dino(&dev->id)) {
                version = "3.x (card mode)";
        } else {
                if (!is_cujo(&dev->id)) {
                        if (dev->id.hversion_rev < 4) {
                                version = dino_vers[dev->id.hversion_rev];
                        }
                } else {
                        name = "Cujo";
                        is_cujo = 1;
                        if (dev->id.hversion_rev < 2) {
                                version = cujo_vers[dev->id.hversion_rev];
                        }
                }
        }

        printk("%s version %s found at 0x%lx\n", name, version, hpa);

        if (!request_mem_region(hpa, PAGE_SIZE, name)) {
                printk(KERN_ERR "DINO: Hey! Someone took my MMIO space (0x%ld)!\n",
                        hpa);
                return 1;
        }

        /* Check for bugs */
        if (is_cujo && dev->id.hversion_rev == 1) {
#ifdef CONFIG_IOMMU_CCIO
                printk(KERN_WARNING "Enabling Cujo 2.0 bug workaround\n");
                if (hpa == (unsigned long)CUJO_RAVEN_ADDR) {
                        ccio_cujo20_fixup(dev, CUJO_RAVEN_BADPAGE);
                } else if (hpa == (unsigned long)CUJO_FIREHAWK_ADDR) {
                        ccio_cujo20_fixup(dev, CUJO_FIREHAWK_BADPAGE);
                } else {
                        printk("Don't recognise Cujo at address 0x%lx, not enabling workaround\n", hpa);
                }
#endif
        } else if (!is_cujo && !is_card_dino(&dev->id) &&
                        dev->id.hversion_rev < 3) {
                printk(KERN_WARNING
"The GSCtoPCI (Dino hrev %d) bus converter found may exhibit\n"
"data corruption.  See Service Note Numbers: A4190A-01, A4191A-01.\n"
"Systems shipped after Aug 20, 1997 will not exhibit this problem.\n"
"Models affected: C180, C160, C160L, B160L, and B132L workstations.\n\n",
                        dev->id.hversion_rev);
/* REVISIT: why are C200/C240 listed in the README table but not
**   "Models affected"? Could be an omission in the original literature.
*/
        }

        dino_dev = kzalloc(sizeof(struct dino_device), GFP_KERNEL);
        if (!dino_dev) {
                printk("dino_init_chip - couldn't alloc dino_device\n");
                return 1;
        }

        dino_dev->hba.dev = dev;
        dino_dev->hba.base_addr = ioremap_nocache(hpa, 4096);
        dino_dev->hba.lmmio_space_offset = 0;   /* CPU addrs == bus addrs */
        spin_lock_init(&dino_dev->dinosaur_pen);
        dino_dev->hba.iommu = ccio_get_iommu(dev);

        if (is_card_dino(&dev->id)) {
                dino_card_init(dino_dev);
        } else {
                dino_bridge_init(dino_dev, name);
        }

        if (dino_common_init(dev, dino_dev, name))
                return 1;

        dev->dev.platform_data = dino_dev;

        /*
        ** It's not used to avoid chicken/egg problems
        ** with configuration accessor functions.
        */
        bus = pci_scan_bus_parented(&dev->dev, dino_current_bus,
                                    &dino_cfg_ops, NULL);
        if(bus) {
                pci_bus_add_devices(bus);
                /* This code *depends* on scanning being single threaded
                 * if it isn't, this global bus number count will fail
                 */
                dino_current_bus = bus->subordinate + 1;
                pci_bus_assign_resources(bus);
        } else {
                printk(KERN_ERR "ERROR: failed to scan PCI bus on %s (probably duplicate bus number %d)\n", dev->dev.bus_id, dino_current_bus);
                /* increment the bus number in case of duplicates */
                dino_current_bus++;
        }
        dino_dev->hba.hba_bus = bus;
        return 0;
}

/*
 * Normally, we would just test sversion.  But the Elroy PCI adapter has
 * the same sversion as Dino, so we have to check hversion as well.
 * Unfortunately, the J2240 PDC reports the wrong hversion for the first
 * Dino, so we have to test for Dino, Cujo and Dino-in-a-J2240.
 * For card-mode Dino, most machines report an sversion of 9D.  But 715
 * and 725 firmware misreport it as 0x08080 for no adequately explained
 * reason.
 */
static struct parisc_device_id dino_tbl[] = {
        { HPHW_A_DMA, HVERSION_REV_ANY_ID, 0x004, 0x0009D },/* Card-mode Dino */
        { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x08080 }, /* XXX */
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x680, 0xa }, /* Bridge-mode Dino */
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x682, 0xa }, /* Bridge-mode Cujo */
        { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x05d, 0xa }, /* Dino in a J2240 */
        { 0, }
};

static struct parisc_driver dino_driver = {
        .name =         "dino",
        .id_table =     dino_tbl,
        .probe =        dino_probe,
};

/*
 * One time initialization to let the world know Dino is here.
 * This is the only routine which is NOT static.
 * Must be called exactly once before pci_init().
 */
int __init dino_init(void)
{
        register_parisc_driver(&dino_driver);
        return 0;
}