Linux-2.6.12-rc2

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / ppc / platforms / pmac_pci.c

/*
 * Support for PCI bridges found on Power Macintoshes.
 * At present the "bandit" and "chaos" bridges are supported.
 * Fortunately you access configuration space in the same
 * way with either bridge.
 *
 * Copyright (C) 1997 Paul Mackerras (paulus@cs.anu.edu.au)
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>

#undef DEBUG

#ifdef DEBUG
#ifdef CONFIG_XMON
extern void xmon_printf(const char *fmt, ...);
#define DBG(x...) xmon_printf(x)
#else
#define DBG(x...) printk(x)
#endif
#else
#define DBG(x...)
#endif

static int add_bridge(struct device_node *dev);
extern void pmac_check_ht_link(void);

/* XXX Could be per-controller, but I don't think we risk anything by
 * assuming we won't have both UniNorth and Bandit */
static int has_uninorth;
#ifdef CONFIG_POWER4
static struct pci_controller *u3_agp;
#endif /* CONFIG_POWER4 */

extern u8 pci_cache_line_size;
extern int pcibios_assign_bus_offset;

struct device_node *k2_skiplist[2];

/*
 * Magic constants for enabling cache coherency in the bandit/PSX bridge.
 */
#define BANDIT_DEVID_2  8
#define BANDIT_REVID    3

#define BANDIT_DEVNUM   11
#define BANDIT_MAGIC    0x50
#define BANDIT_COHERENT 0x40

static int __init
fixup_one_level_bus_range(struct device_node *node, int higher)
{
        for (; node != 0;node = node->sibling) {
                int * bus_range;
                unsigned int *class_code;
                int len;

                /* For PCI<->PCI bridges or CardBus bridges, we go down */
                class_code = (unsigned int *) get_property(node, "class-code", NULL);
                if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
                        (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
                        continue;
                bus_range = (int *) get_property(node, "bus-range", &len);
                if (bus_range != NULL && len > 2 * sizeof(int)) {
                        if (bus_range[1] > higher)
                                higher = bus_range[1];
                }
                higher = fixup_one_level_bus_range(node->child, higher);
        }
        return higher;
}

/* This routine fixes the "bus-range" property of all bridges in the
 * system since they tend to have their "last" member wrong on macs
 *
 * Note that the bus numbers manipulated here are OF bus numbers, they
 * are not Linux bus numbers.
 */
static void __init
fixup_bus_range(struct device_node *bridge)
{
        int * bus_range;
        int len;

        /* Lookup the "bus-range" property for the hose */
        bus_range = (int *) get_property(bridge, "bus-range", &len);
        if (bus_range == NULL || len < 2 * sizeof(int)) {
                printk(KERN_WARNING "Can't get bus-range for %s\n",
                               bridge->full_name);
                return;
        }
        bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
}

/*
 * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
 *
 * The "Bandit" version is present in all early PCI PowerMacs,
 * and up to the first ones using Grackle. Some machines may
 * have 2 bandit controllers (2 PCI busses).
 *
 * "Chaos" is used in some "Bandit"-type machines as a bridge
 * for the separate display bus. It is accessed the same
 * way as bandit, but cannot be probed for devices. It therefore
 * has its own config access functions.
 *
 * The "UniNorth" version is present in all Core99 machines
 * (iBook, G4, new IMacs, and all the recent Apple machines).
 * It contains 3 controllers in one ASIC.
 *
 * The U3 is the bridge used on G5 machines. It contains an
 * AGP bus which is dealt with the old UniNorth access routines
 * and a HyperTransport bus which uses its own set of access
 * functions.
 */

#define MACRISC_CFA0(devfn, off)        \
        ((1 << (unsigned long)PCI_SLOT(dev_fn)) \
        | (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
        | (((unsigned long)(off)) & 0xFCUL))

#define MACRISC_CFA1(bus, devfn, off)   \
        ((((unsigned long)(bus)) << 16) \
        |(((unsigned long)(devfn)) << 8) \
        |(((unsigned long)(off)) & 0xFCUL) \
        |1UL)

static void volatile __iomem * __pmac
macrisc_cfg_access(struct pci_controller* hose, u8 bus, u8 dev_fn, u8 offset)
{
        unsigned int caddr;

        if (bus == hose->first_busno) {
                if (dev_fn < (11 << 3))
                        return NULL;
                caddr = MACRISC_CFA0(dev_fn, offset);
        } else
                caddr = MACRISC_CFA1(bus, dev_fn, offset);

        /* Uninorth will return garbage if we don't read back the value ! */
        do {
                out_le32(hose->cfg_addr, caddr);
        } while (in_le32(hose->cfg_addr) != caddr);

        offset &= has_uninorth ? 0x07 : 0x03;
        return hose->cfg_data + offset;
}

static int __pmac
macrisc_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                    int len, u32 *val)
{
        struct pci_controller *hose = bus->sysdata;
        void volatile __iomem *addr;

        addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;
        /*
         * Note: the caller has already checked that offset is
         * suitably aligned and that len is 1, 2 or 4.
         */
        switch (len) {
        case 1:
                *val = in_8(addr);
                break;
        case 2:
                *val = in_le16(addr);
                break;
        default:
                *val = in_le32(addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static int __pmac
macrisc_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
                     int len, u32 val)
{
        struct pci_controller *hose = bus->sysdata;
        void volatile __iomem *addr;

        addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;
        /*
         * Note: the caller has already checked that offset is
         * suitably aligned and that len is 1, 2 or 4.
         */
        switch (len) {
        case 1:
                out_8(addr, val);
                (void) in_8(addr);
                break;
        case 2:
                out_le16(addr, val);
                (void) in_le16(addr);
                break;
        default:
                out_le32(addr, val);
                (void) in_le32(addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops macrisc_pci_ops =
{
        macrisc_read_config,
        macrisc_write_config
};

/*
 * Verifiy that a specific (bus, dev_fn) exists on chaos
 */
static int __pmac
chaos_validate_dev(struct pci_bus *bus, int devfn, int offset)
{
        struct device_node *np;
        u32 *vendor, *device;

        np = pci_busdev_to_OF_node(bus, devfn);
        if (np == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        vendor = (u32 *)get_property(np, "vendor-id", NULL);
        device = (u32 *)get_property(np, "device-id", NULL);
        if (vendor == NULL || device == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        if ((*vendor == 0x106b) && (*device == 3) && (offset >= 0x10)
            && (offset != 0x14) && (offset != 0x18) && (offset <= 0x24))
                return PCIBIOS_BAD_REGISTER_NUMBER;

        return PCIBIOS_SUCCESSFUL;
}

static int __pmac
chaos_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                  int len, u32 *val)
{
        int result = chaos_validate_dev(bus, devfn, offset);
        if (result == PCIBIOS_BAD_REGISTER_NUMBER)
                *val = ~0U;
        if (result != PCIBIOS_SUCCESSFUL)
                return result;
        return macrisc_read_config(bus, devfn, offset, len, val);
}

static int __pmac
chaos_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
                   int len, u32 val)
{
        int result = chaos_validate_dev(bus, devfn, offset);
        if (result != PCIBIOS_SUCCESSFUL)
                return result;
        return macrisc_write_config(bus, devfn, offset, len, val);
}

static struct pci_ops chaos_pci_ops =
{
        chaos_read_config,
        chaos_write_config
};

#ifdef CONFIG_POWER4

/*
 * These versions of U3 HyperTransport config space access ops do not
 * implement self-view of the HT host yet
 */

#define U3_HT_CFA0(devfn, off)          \
                ((((unsigned long)devfn) << 8) | offset)
#define U3_HT_CFA1(bus, devfn, off)     \
                (U3_HT_CFA0(devfn, off) \
                + (((unsigned long)bus) << 16) \
                + 0x01000000UL)

static void volatile __iomem * __pmac
u3_ht_cfg_access(struct pci_controller* hose, u8 bus, u8 devfn, u8 offset)
{
        if (bus == hose->first_busno) {
                /* For now, we don't self probe U3 HT bridge */
                if (PCI_FUNC(devfn) != 0 || PCI_SLOT(devfn) > 7 ||
                    PCI_SLOT(devfn) < 1)
                        return 0;
                return hose->cfg_data + U3_HT_CFA0(devfn, offset);
        } else
                return hose->cfg_data + U3_HT_CFA1(bus, devfn, offset);
}

static int __pmac
u3_ht_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                    int len, u32 *val)
{
        struct pci_controller *hose = bus->sysdata;
        void volatile __iomem *addr;
        int i;

        struct device_node *np = pci_busdev_to_OF_node(bus, devfn);
        if (np == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        /*
         * When a device in K2 is powered down, we die on config
         * cycle accesses. Fix that here.
         */
        for (i=0; i<2; i++)
                if (k2_skiplist[i] == np) {
                        switch (len) {
                        case 1:
                                *val = 0xff; break;
                        case 2:
                                *val = 0xffff; break;
                        default:
                                *val = 0xfffffffful; break;
                        }
                        return PCIBIOS_SUCCESSFUL;
                }
            
        addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;
        /*
         * Note: the caller has already checked that offset is
         * suitably aligned and that len is 1, 2 or 4.
         */
        switch (len) {
        case 1:
                *val = in_8(addr);
                break;
        case 2:
                *val = in_le16(addr);
                break;
        default:
                *val = in_le32(addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static int __pmac
u3_ht_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
                     int len, u32 val)
{
        struct pci_controller *hose = bus->sysdata;
        void volatile __iomem *addr;
        int i;

        struct device_node *np = pci_busdev_to_OF_node(bus, devfn);
        if (np == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;
        /*
         * When a device in K2 is powered down, we die on config
         * cycle accesses. Fix that here.
         */
        for (i=0; i<2; i++)
                if (k2_skiplist[i] == np)
                        return PCIBIOS_SUCCESSFUL;

        addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;
        /*
         * Note: the caller has already checked that offset is
         * suitably aligned and that len is 1, 2 or 4.
         */
        switch (len) {
        case 1:
                out_8(addr, val);
                (void) in_8(addr);
                break;
        case 2:
                out_le16(addr, val);
                (void) in_le16(addr);
                break;
        default:
                out_le32(addr, val);
                (void) in_le32(addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops u3_ht_pci_ops =
{
        u3_ht_read_config,
        u3_ht_write_config
};

#endif /* CONFIG_POWER4 */

/*
 * For a bandit bridge, turn on cache coherency if necessary.
 * N.B. we could clean this up using the hose ops directly.
 */
static void __init
init_bandit(struct pci_controller *bp)
{
        unsigned int vendev, magic;
        int rev;

        /* read the word at offset 0 in config space for device 11 */
        out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + PCI_VENDOR_ID);
        udelay(2);
        vendev = in_le32(bp->cfg_data);
        if (vendev == (PCI_DEVICE_ID_APPLE_BANDIT << 16) +
                        PCI_VENDOR_ID_APPLE) {
                /* read the revision id */
                out_le32(bp->cfg_addr,
                         (1UL << BANDIT_DEVNUM) + PCI_REVISION_ID);
                udelay(2);
                rev = in_8(bp->cfg_data);
                if (rev != BANDIT_REVID)
                        printk(KERN_WARNING
                               "Unknown revision %d for bandit\n", rev);
        } else if (vendev != (BANDIT_DEVID_2 << 16) + PCI_VENDOR_ID_APPLE) {
                printk(KERN_WARNING "bandit isn't? (%x)\n", vendev);
                return;
        }

        /* read the word at offset 0x50 */
        out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + BANDIT_MAGIC);
        udelay(2);
        magic = in_le32(bp->cfg_data);
        if ((magic & BANDIT_COHERENT) != 0)
                return;
        magic |= BANDIT_COHERENT;
        udelay(2);
        out_le32(bp->cfg_data, magic);
        printk(KERN_INFO "Cache coherency enabled for bandit/PSX\n");
}


/*
 * Tweak the PCI-PCI bridge chip on the blue & white G3s.
 */
static void __init
init_p2pbridge(void)
{
        struct device_node *p2pbridge;
        struct pci_controller* hose;
        u8 bus, devfn;
        u16 val;

        /* XXX it would be better here to identify the specific
           PCI-PCI bridge chip we have. */
        if ((p2pbridge = find_devices("pci-bridge")) == 0
            || p2pbridge->parent == NULL
            || strcmp(p2pbridge->parent->name, "pci") != 0)
                return;
        if (pci_device_from_OF_node(p2pbridge, &bus, &devfn) < 0) {
                DBG("Can't find PCI infos for PCI<->PCI bridge\n");
                return;
        }
        /* Warning: At this point, we have not yet renumbered all busses.
         * So we must use OF walking to find out hose
         */
        hose = pci_find_hose_for_OF_device(p2pbridge);
        if (!hose) {
                DBG("Can't find hose for PCI<->PCI bridge\n");
                return;
        }
        if (early_read_config_word(hose, bus, devfn,
                                   PCI_BRIDGE_CONTROL, &val) < 0) {
                printk(KERN_ERR "init_p2pbridge: couldn't read bridge control\n");
                return;
        }
        val &= ~PCI_BRIDGE_CTL_MASTER_ABORT;
        early_write_config_word(hose, bus, devfn, PCI_BRIDGE_CONTROL, val);
}

/*
 * Some Apple desktop machines have a NEC PD720100A USB2 controller
 * on the motherboard. Open Firmware, on these, will disable the
 * EHCI part of it so it behaves like a pair of OHCI's. This fixup
 * code re-enables it ;)
 */
static void __init
fixup_nec_usb2(void)
{
        struct device_node *nec;

        for (nec = NULL; (nec = of_find_node_by_name(nec, "usb")) != NULL;) {
                struct pci_controller *hose;
                u32 data, *prop;
                u8 bus, devfn;
                
                prop = (u32 *)get_property(nec, "vendor-id", NULL);
                if (prop == NULL)
                        continue;
                if (0x1033 != *prop)
                        continue;
                prop = (u32 *)get_property(nec, "device-id", NULL);
                if (prop == NULL)
                        continue;
                if (0x0035 != *prop)
                        continue;
                prop = (u32 *)get_property(nec, "reg", NULL);
                if (prop == NULL)
                        continue;
                devfn = (prop[0] >> 8) & 0xff;
                bus = (prop[0] >> 16) & 0xff;
                if (PCI_FUNC(devfn) != 0)
                        continue;
                hose = pci_find_hose_for_OF_device(nec);
                if (!hose)
                        continue;
                early_read_config_dword(hose, bus, devfn, 0xe4, &data);
                if (data & 1UL) {
                        printk("Found NEC PD720100A USB2 chip with disabled EHCI, fixing up...\n");
                        data &= ~1UL;
                        early_write_config_dword(hose, bus, devfn, 0xe4, data);
                        early_write_config_byte(hose, bus, devfn | 2, PCI_INTERRUPT_LINE,
                                nec->intrs[0].line);
                }
        }
}

void __init
pmac_find_bridges(void)
{
        struct device_node *np, *root;
        struct device_node *ht = NULL;

        root = of_find_node_by_path("/");
        if (root == NULL) {
                printk(KERN_CRIT "pmac_find_bridges: can't find root of device tree\n");
                return;
        }
        for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
                if (np->name == NULL)
                        continue;
                if (strcmp(np->name, "bandit") == 0
                    || strcmp(np->name, "chaos") == 0
                    || strcmp(np->name, "pci") == 0) {
                        if (add_bridge(np) == 0)
                                of_node_get(np);
                }
                if (strcmp(np->name, "ht") == 0) {
                        of_node_get(np);
                        ht = np;
                }
        }
        of_node_put(root);

        /* Probe HT last as it relies on the agp resources to be already
         * setup
         */
        if (ht && add_bridge(ht) != 0)
                of_node_put(ht);

        init_p2pbridge();
        fixup_nec_usb2();
        
        /* We are still having some issues with the Xserve G4, enabling
         * some offset between bus number and domains for now when we
         * assign all busses should help for now
         */
        if (pci_assign_all_busses)
                pcibios_assign_bus_offset = 0x10;

#ifdef CONFIG_POWER4 
        /* There is something wrong with DMA on U3/HT. I haven't figured out
         * the details yet, but if I set the cache line size to 128 bytes like
         * it should, I'm getting memory corruption caused by devices like
         * sungem (even without the MWI bit set, but maybe sungem doesn't
         * care). Right now, it appears that setting up a 64 bytes line size
         * works properly, 64 bytes beeing the max transfer size of HT, I
         * suppose this is related the way HT/PCI are hooked together. I still
         * need to dive into more specs though to be really sure of what's
         * going on. --BenH.
         *
         * Ok, apparently, it's just that HT can't do more than 64 bytes
         * transactions. MWI seem to be meaningless there as well, it may
         * be worth nop'ing out pci_set_mwi too though I haven't done that
         * yet.
         *
         * Note that it's a bit different for whatever is in the AGP slot.
         * For now, I don't care, but this can become a real issue, we
         * should probably hook pci_set_mwi anyway to make sure it sets
         * the real cache line size in there.
         */
        if (machine_is_compatible("MacRISC4"))
                pci_cache_line_size = 16; /* 64 bytes */

        pmac_check_ht_link();
#endif /* CONFIG_POWER4 */
}

#define GRACKLE_CFA(b, d, o)    (0x80 | ((b) << 8) | ((d) << 16) \
                                 | (((o) & ~3) << 24))

#define GRACKLE_PICR1_STG               0x00000040
#define GRACKLE_PICR1_LOOPSNOOP         0x00000010

/* N.B. this is called before bridges is initialized, so we can't
   use grackle_pcibios_{read,write}_config_dword. */
static inline void grackle_set_stg(struct pci_controller* bp, int enable)
{
        unsigned int val;

        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
        val = in_le32(bp->cfg_data);
        val = enable? (val | GRACKLE_PICR1_STG) :
                (val & ~GRACKLE_PICR1_STG);
        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
        out_le32(bp->cfg_data, val);
        (void)in_le32(bp->cfg_data);
}

static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
{
        unsigned int val;

        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
        val = in_le32(bp->cfg_data);
        val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
                (val & ~GRACKLE_PICR1_LOOPSNOOP);
        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
        out_le32(bp->cfg_data, val);
        (void)in_le32(bp->cfg_data);
}

static int __init
setup_uninorth(struct pci_controller* hose, struct reg_property* addr)
{
        pci_assign_all_busses = 1;
        has_uninorth = 1;
        hose->ops = &macrisc_pci_ops;
        hose->cfg_addr = ioremap(addr->address + 0x800000, 0x1000);
        hose->cfg_data = ioremap(addr->address + 0xc00000, 0x1000);
        /* We "know" that the bridge at f2000000 has the PCI slots. */
        return addr->address == 0xf2000000;
}

static void __init
setup_bandit(struct pci_controller* hose, struct reg_property* addr)
{
        hose->ops = &macrisc_pci_ops;
        hose->cfg_addr = ioremap(addr->address + 0x800000, 0x1000);
        hose->cfg_data = ioremap(addr->address + 0xc00000, 0x1000);
        init_bandit(hose);
}

static void __init
setup_chaos(struct pci_controller* hose, struct reg_property* addr)
{
        /* assume a `chaos' bridge */
        hose->ops = &chaos_pci_ops;
        hose->cfg_addr = ioremap(addr->address + 0x800000, 0x1000);
        hose->cfg_data = ioremap(addr->address + 0xc00000, 0x1000);
}

#ifdef CONFIG_POWER4

static void __init
setup_u3_agp(struct pci_controller* hose, struct reg_property* addr)
{
        /* On G5, we move AGP up to high bus number so we don't need
         * to reassign bus numbers for HT. If we ever have P2P bridges
         * on AGP, we'll have to move pci_assign_all_busses to the
         * pci_controller structure so we enable it for AGP and not for
         * HT childs.
         * We hard code the address because of the different size of
         * the reg address cell, we shall fix that by killing struct
         * reg_property and using some accessor functions instead
         */
        hose->first_busno = 0xf0;
        hose->last_busno = 0xff;
        has_uninorth = 1;
        hose->ops = &macrisc_pci_ops;
        hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
        hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

        u3_agp = hose;
}

static void __init
setup_u3_ht(struct pci_controller* hose, struct reg_property *addr)
{
        struct device_node *np = (struct device_node *)hose->arch_data;
        int i, cur;

        hose->ops = &u3_ht_pci_ops;

        /* We hard code the address because of the different size of
         * the reg address cell, we shall fix that by killing struct
         * reg_property and using some accessor functions instead
         */
        hose->cfg_data = ioremap(0xf2000000, 0x02000000);

        /*
         * /ht node doesn't expose a "ranges" property, so we "remove" regions that
         * have been allocated to AGP. So far, this version of the code doesn't assign
         * any of the 0xfxxxxxxx "fine" memory regions to /ht.
         * We need to fix that sooner or later by either parsing all child "ranges"
         * properties or figuring out the U3 address space decoding logic and
         * then read its configuration register (if any).
         */
        hose->io_base_phys = 0xf4000000;
        hose->io_base_virt = ioremap(hose->io_base_phys, 0x00400000);
        isa_io_base = (unsigned long) hose->io_base_virt;
        hose->io_resource.name = np->full_name;
        hose->io_resource.start = 0;
        hose->io_resource.end = 0x003fffff;
        hose->io_resource.flags = IORESOURCE_IO;
        hose->pci_mem_offset = 0;
        hose->first_busno = 0;
        hose->last_busno = 0xef;
        hose->mem_resources[0].name = np->full_name;
        hose->mem_resources[0].start = 0x80000000;
        hose->mem_resources[0].end = 0xefffffff;
        hose->mem_resources[0].flags = IORESOURCE_MEM;

        if (u3_agp == NULL) {
                DBG("U3 has no AGP, using full resource range\n");
                return;
        }

        /* We "remove" the AGP resources from the resources allocated to HT, that
         * is we create "holes". However, that code does assumptions that so far
         * happen to be true (cross fingers...), typically that resources in the
         * AGP node are properly ordered
         */
        cur = 0;
        for (i=0; i<3; i++) {
                struct resource *res = &u3_agp->mem_resources[i];
                if (res->flags != IORESOURCE_MEM)
                        continue;
                /* We don't care about "fine" resources */
                if (res->start >= 0xf0000000)
                        continue;
                /* Check if it's just a matter of "shrinking" us in one direction */
                if (hose->mem_resources[cur].start == res->start) {
                        DBG("U3/HT: shrink start of %d, %08lx -> %08lx\n",
                            cur, hose->mem_resources[cur].start, res->end + 1);
                        hose->mem_resources[cur].start = res->end + 1;
                        continue;
                }
                if (hose->mem_resources[cur].end == res->end) {
                        DBG("U3/HT: shrink end of %d, %08lx -> %08lx\n",
                            cur, hose->mem_resources[cur].end, res->start - 1);
                        hose->mem_resources[cur].end = res->start - 1;
                        continue;
                }
                /* No, it's not the case, we need a hole */
                if (cur == 2) {
                        /* not enough resources to make a hole, we drop part of the range */
                        printk(KERN_WARNING "Running out of resources for /ht host !\n");
                        hose->mem_resources[cur].end = res->start - 1;
                        continue;
                }               
                cur++;
                DBG("U3/HT: hole, %d end at %08lx, %d start at %08lx\n",
                    cur-1, res->start - 1, cur, res->end + 1);
                hose->mem_resources[cur].name = np->full_name;
                hose->mem_resources[cur].flags = IORESOURCE_MEM;
                hose->mem_resources[cur].start = res->end + 1;
                hose->mem_resources[cur].end = hose->mem_resources[cur-1].end;
                hose->mem_resources[cur-1].end = res->start - 1;
        }
}

#endif /* CONFIG_POWER4 */

void __init
setup_grackle(struct pci_controller *hose)
{
        setup_indirect_pci(hose, 0xfec00000, 0xfee00000);
        if (machine_is_compatible("AAPL,PowerBook1998"))
                grackle_set_loop_snoop(hose, 1);
#if 0   /* Disabled for now, HW problems ??? */
        grackle_set_stg(hose, 1);
#endif
}

/*
 * We assume that if we have a G3 powermac, we have one bridge called
 * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
 * if we have one or more bandit or chaos bridges, we don't have a MPC106.
 */
static int __init
add_bridge(struct device_node *dev)
{
        int len;
        struct pci_controller *hose;
        struct reg_property *addr;
        char* disp_name;
        int *bus_range;
        int primary = 1;

        DBG("Adding PCI host bridge %s\n", dev->full_name);

        addr = (struct reg_property *) get_property(dev, "reg", &len);
        if (addr == NULL || len < sizeof(*addr)) {
                printk(KERN_WARNING "Can't use %s: no address\n",
                       dev->full_name);
                return -ENODEV;
        }
        bus_range = (int *) get_property(dev, "bus-range", &len);
        if (bus_range == NULL || len < 2 * sizeof(int)) {
                printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
                               dev->full_name);
        }

        hose = pcibios_alloc_controller();
        if (!hose)
                return -ENOMEM;
        hose->arch_data = dev;
        hose->first_busno = bus_range ? bus_range[0] : 0;
        hose->last_busno = bus_range ? bus_range[1] : 0xff;

        disp_name = NULL;
#ifdef CONFIG_POWER4
        if (device_is_compatible(dev, "u3-agp")) {
                setup_u3_agp(hose, addr);
                disp_name = "U3-AGP";
                primary = 0;
        } else if (device_is_compatible(dev, "u3-ht")) {
                setup_u3_ht(hose, addr);
                disp_name = "U3-HT";
                primary = 1;
        } else
#endif /* CONFIG_POWER4 */
        if (device_is_compatible(dev, "uni-north")) {
                primary = setup_uninorth(hose, addr);
                disp_name = "UniNorth";
        } else if (strcmp(dev->name, "pci") == 0) {
                /* XXX assume this is a mpc106 (grackle) */
                setup_grackle(hose);
                disp_name = "Grackle (MPC106)";
        } else if (strcmp(dev->name, "bandit") == 0) {
                setup_bandit(hose, addr);
                disp_name = "Bandit";
        } else if (strcmp(dev->name, "chaos") == 0) {
                setup_chaos(hose, addr);
                disp_name = "Chaos";
                primary = 0;
        }
        printk(KERN_INFO "Found %s PCI host bridge at 0x%08x. Firmware bus number: %d->%d\n",
                disp_name, addr->address, hose->first_busno, hose->last_busno);
        DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
                hose, hose->cfg_addr, hose->cfg_data);

        /* Interpret the "ranges" property */
        /* This also maps the I/O region and sets isa_io/mem_base */
        pci_process_bridge_OF_ranges(hose, dev, primary);

        /* Fixup "bus-range" OF property */
        fixup_bus_range(dev);

        return 0;
}

static void __init
pcibios_fixup_OF_interrupts(void)
{
        struct pci_dev* dev = NULL;

        /*
         * Open Firmware often doesn't initialize the
         * PCI_INTERRUPT_LINE config register properly, so we
         * should find the device node and apply the interrupt
         * obtained from the OF device-tree
         */
        for_each_pci_dev(dev) {
                struct device_node *node;
                node = pci_device_to_OF_node(dev);
                /* this is the node, see if it has interrupts */
                if (node && node->n_intrs > 0)
                        dev->irq = node->intrs[0].line;
                pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
        }
}

void __init
pmac_pcibios_fixup(void)
{
        /* Fixup interrupts according to OF tree */
        pcibios_fixup_OF_interrupts();
}

int __pmac
pmac_pci_enable_device_hook(struct pci_dev *dev, int initial)
{
        struct device_node* node;
        int updatecfg = 0;
        int uninorth_child;

        node = pci_device_to_OF_node(dev);

        /* We don't want to enable USB controllers absent from the OF tree
         * (iBook second controller)
         */
        if (dev->vendor == PCI_VENDOR_ID_APPLE
            && (dev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x10))
            && !node) {
                printk(KERN_INFO "Apple USB OHCI %s disabled by firmware\n",
                       pci_name(dev));
                return -EINVAL;
        }

        if (!node)
                return 0;

        uninorth_child = node->parent &&
                device_is_compatible(node->parent, "uni-north");
        
        /* Firewire & GMAC were disabled after PCI probe, the driver is
         * claiming them, we must re-enable them now.
         */
        if (uninorth_child && !strcmp(node->name, "firewire") &&
            (device_is_compatible(node, "pci106b,18") ||
             device_is_compatible(node, "pci106b,30") ||
             device_is_compatible(node, "pci11c1,5811"))) {
                pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, node, 0, 1);
                pmac_call_feature(PMAC_FTR_1394_ENABLE, node, 0, 1);
                updatecfg = 1;
        }
        if (uninorth_child && !strcmp(node->name, "ethernet") &&
            device_is_compatible(node, "gmac")) {
                pmac_call_feature(PMAC_FTR_GMAC_ENABLE, node, 0, 1);
                updatecfg = 1;
        }

        if (updatecfg) {
                u16 cmd;
        
                /*
                 * Make sure PCI is correctly configured
                 *
                 * We use old pci_bios versions of the function since, by
                 * default, gmac is not powered up, and so will be absent
                 * from the kernel initial PCI lookup.
                 *
                 * Should be replaced by 2.4 new PCI mechanisms and really
                 * register the device.
                 */
                pci_read_config_word(dev, PCI_COMMAND, &cmd);
                cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
                pci_write_config_word(dev, PCI_COMMAND, cmd);
                pci_write_config_byte(dev, PCI_LATENCY_TIMER, 16);
                pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
        }

        return 0;
}

/* We power down some devices after they have been probed. They'll
 * be powered back on later on
 */
void __init
pmac_pcibios_after_init(void)
{
        struct device_node* nd;

#ifdef CONFIG_BLK_DEV_IDE
        struct pci_dev *dev = NULL;

        /* OF fails to initialize IDE controllers on macs
         * (and maybe other machines)
         *
         * Ideally, this should be moved to the IDE layer, but we need
         * to check specifically with Andre Hedrick how to do it cleanly
         * since the common IDE code seem to care about the fact that the
         * BIOS may have disabled a controller.
         *
         * -- BenH
         */
        for_each_pci_dev(dev) {
                if ((dev->class >> 16) == PCI_BASE_CLASS_STORAGE)
                        pci_enable_device(dev);
        }
#endif /* CONFIG_BLK_DEV_IDE */

        nd = find_devices("firewire");
        while (nd) {
                if (nd->parent && (device_is_compatible(nd, "pci106b,18") ||
                                   device_is_compatible(nd, "pci106b,30") ||
                                   device_is_compatible(nd, "pci11c1,5811"))
                    && device_is_compatible(nd->parent, "uni-north")) {
                        pmac_call_feature(PMAC_FTR_1394_ENABLE, nd, 0, 0);
                        pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, nd, 0, 0);
                }
                nd = nd->next;
        }
        nd = find_devices("ethernet");
        while (nd) {
                if (nd->parent && device_is_compatible(nd, "gmac")
                    && device_is_compatible(nd->parent, "uni-north"))
                        pmac_call_feature(PMAC_FTR_GMAC_ENABLE, nd, 0, 0);
                nd = nd->next;
        }
}

void pmac_pci_fixup_cardbus(struct pci_dev* dev)
{
        if (_machine != _MACH_Pmac)
                return;
        /*
         * Fix the interrupt routing on the various cardbus bridges
         * used on powerbooks
         */
        if (dev->vendor != PCI_VENDOR_ID_TI)
                return;
        if (dev->device == PCI_DEVICE_ID_TI_1130 ||
            dev->device == PCI_DEVICE_ID_TI_1131) {
                u8 val;
                /* Enable PCI interrupt */
                if (pci_read_config_byte(dev, 0x91, &val) == 0)
                        pci_write_config_byte(dev, 0x91, val | 0x30);
                /* Disable ISA interrupt mode */
                if (pci_read_config_byte(dev, 0x92, &val) == 0)
                        pci_write_config_byte(dev, 0x92, val & ~0x06);
        }
        if (dev->device == PCI_DEVICE_ID_TI_1210 ||
            dev->device == PCI_DEVICE_ID_TI_1211 ||
            dev->device == PCI_DEVICE_ID_TI_1410 ||
            dev->device == PCI_DEVICE_ID_TI_1510) {
                u8 val;
                /* 0x8c == TI122X_IRQMUX, 2 says to route the INTA
                   signal out the MFUNC0 pin */
                if (pci_read_config_byte(dev, 0x8c, &val) == 0)
                        pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2);
                /* Disable ISA interrupt mode */
                if (pci_read_config_byte(dev, 0x92, &val) == 0)
                        pci_write_config_byte(dev, 0x92, val & ~0x06);
        }
}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_ANY_ID, pmac_pci_fixup_cardbus);

void pmac_pci_fixup_pciata(struct pci_dev* dev)
{
       u8 progif = 0;

       /*
        * On PowerMacs, we try to switch any PCI ATA controller to
        * fully native mode
        */
        if (_machine != _MACH_Pmac)
                return;
        /* Some controllers don't have the class IDE */
        if (dev->vendor == PCI_VENDOR_ID_PROMISE)
                switch(dev->device) {
                case PCI_DEVICE_ID_PROMISE_20246:
                case PCI_DEVICE_ID_PROMISE_20262:
                case PCI_DEVICE_ID_PROMISE_20263:
                case PCI_DEVICE_ID_PROMISE_20265:
                case PCI_DEVICE_ID_PROMISE_20267:
                case PCI_DEVICE_ID_PROMISE_20268:
                case PCI_DEVICE_ID_PROMISE_20269:
                case PCI_DEVICE_ID_PROMISE_20270:
                case PCI_DEVICE_ID_PROMISE_20271:
                case PCI_DEVICE_ID_PROMISE_20275:
                case PCI_DEVICE_ID_PROMISE_20276:
                case PCI_DEVICE_ID_PROMISE_20277:
                        goto good;
                }
        /* Others, check PCI class */
        if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
                return;
 good:
        pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
        if ((progif & 5) != 5) {
                printk(KERN_INFO "Forcing PCI IDE into native mode: %s\n", pci_name(dev));
                (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
                if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
                    (progif & 5) != 5)
                        printk(KERN_ERR "Rewrite of PROGIF failed !\n");
        }
}
DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pmac_pci_fixup_pciata);


/*
 * Disable second function on K2-SATA, it's broken
 * and disable IO BARs on first one
 */
void __pmac pmac_pci_fixup_k2_sata(struct pci_dev* dev)
{
        int i;
        u16 cmd;

        if (PCI_FUNC(dev->devfn) > 0) {
                pci_read_config_word(dev, PCI_COMMAND, &cmd);
                cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
                pci_write_config_word(dev, PCI_COMMAND, cmd);
                for (i = 0; i < 6; i++) {
                        dev->resource[i].start = dev->resource[i].end = 0;
                        dev->resource[i].flags = 0;
                        pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
                }
        } else {
                pci_read_config_word(dev, PCI_COMMAND, &cmd);
                cmd &= ~PCI_COMMAND_IO;
                pci_write_config_word(dev, PCI_COMMAND, cmd);
                for (i = 0; i < 5; i++) {
                        dev->resource[i].start = dev->resource[i].end = 0;
                        dev->resource[i].flags = 0;
                        pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
                }
        }
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, pmac_pci_fixup_k2_sata);