Linux-2.6.12-rc2

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / ppc64 / kernel / 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) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
 *
 * 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>
#include <asm/iommu.h>

#include "pci.h"
#include "pmac.h"

#define DEBUG

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

/* 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;
static struct pci_controller *u3_agp;
struct device_node *k2_skiplist[2];

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 on
 * AGP bus which is dealt with the old UniNorth access routines
 * and an 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 unsigned long __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 0;
                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 ((unsigned long)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;
        unsigned long addr;

        hose = pci_bus_to_host(bus);
        if (hose == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        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((u8 *)addr);
                break;
        case 2:
                *val = in_le16((u16 *)addr);
                break;
        default:
                *val = in_le32((u32 *)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;
        unsigned long addr;

        hose = pci_bus_to_host(bus);
        if (hose == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        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((u8 *)addr, val);
                (void) in_8((u8 *)addr);
                break;
        case 2:
                out_le16((u16 *)addr, val);
                (void) in_le16((u16 *)addr);
                break;
        default:
                out_le32((u32 *)addr, val);
                (void) in_le32((u32 *)addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops macrisc_pci_ops =
{
        macrisc_read_config,
        macrisc_write_config
};

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

/*
 * This function deals with some "special cases" devices.
 *
 *  0 -> No special case
 *  1 -> Skip the device but act as if the access was successfull
 *       (return 0xff's on reads, eventually, cache config space
 *       accesses in a later version)
 * -1 -> Hide the device (unsuccessful acess)
 */
static int u3_ht_skip_device(struct pci_controller *hose,
                             struct pci_bus *bus, unsigned int devfn)
{
        struct device_node *busdn, *dn;
        int i;

        /* We only allow config cycles to devices that are in OF device-tree
         * as we are apparently having some weird things going on with some
         * revs of K2 on recent G5s
         */
        if (bus->self)
                busdn = pci_device_to_OF_node(bus->self);
        else
                busdn = hose->arch_data;
        for (dn = busdn->child; dn; dn = dn->sibling)
                if (dn->devfn == devfn)
                        break;
        if (dn == NULL)
                return -1;

        /*
         * 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] == dn)
                        return 1;

        return 0;
}

#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 unsigned long __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_SLOT(devfn) == 0)
                        return 0;
                return ((unsigned long)hose->cfg_data) + U3_HT_CFA0(devfn, offset);
        } else
                return ((unsigned long)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;
        unsigned long addr;


        hose = pci_bus_to_host(bus);      
        if (hose == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;

        switch (u3_ht_skip_device(hose, bus, devfn)) {
        case 0:
                break;
        case 1:
                switch (len) {
                case 1:
                        *val = 0xff; break;
                case 2:
                        *val = 0xffff; break;
                default:
                        *val = 0xfffffffful; break;
                }
                return PCIBIOS_SUCCESSFUL;
        default:
                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((u8 *)addr);
                break;
        case 2:
                *val = in_le16((u16 *)addr);
                break;
        default:
                *val = in_le32((u32 *)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;
        unsigned long addr;

        hose = pci_bus_to_host(bus);
        if (hose == NULL)
                return PCIBIOS_DEVICE_NOT_FOUND;

        addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
        if (!addr)
                return PCIBIOS_DEVICE_NOT_FOUND;

        switch (u3_ht_skip_device(hose, bus, devfn)) {
        case 0:
                break;
        case 1:
                return PCIBIOS_SUCCESSFUL;
        default:
                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((u8 *)addr, val);
                (void) in_8((u8 *)addr);
                break;
        case 2:
                out_le16((u16 *)addr, val);
                (void) in_le16((u16 *)addr);
                break;
        default:
                out_le32((u32 *)addr, val);
                (void) in_le32((u32 *)addr);
                break;
        }
        return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops u3_ht_pci_ops =
{
        u3_ht_read_config,
        u3_ht_write_config
};

static void __init setup_u3_agp(struct pci_controller* hose)
{
        /* 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 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 = (volatile unsigned char *)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 it's configuration register (if any).
         */
        hose->io_base_phys = 0xf4000000;
        hose->io_base_virt = ioremap(hose->io_base_phys, 0x00400000);
        isa_io_base = pci_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 for 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;
        }
}

static void __init pmac_process_bridge_OF_ranges(struct pci_controller *hose,
                           struct device_node *dev, int primary)
{
        static unsigned int static_lc_ranges[2024];
        unsigned int *dt_ranges, *lc_ranges, *ranges, *prev;
        unsigned int size;
        int rlen = 0, orig_rlen;
        int memno = 0;
        struct resource *res;
        int np, na = prom_n_addr_cells(dev);

        np = na + 5;

        /* First we try to merge ranges to fix a problem with some pmacs
         * that can have more than 3 ranges, fortunately using contiguous
         * addresses -- BenH
         */
        dt_ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
        if (!dt_ranges)
                return;
        /*      lc_ranges = alloc_bootmem(rlen);*/
        lc_ranges = static_lc_ranges;
        if (!lc_ranges)
                return; /* what can we do here ? */
        memcpy(lc_ranges, dt_ranges, rlen);
        orig_rlen = rlen;

        /* Let's work on a copy of the "ranges" property instead of damaging
         * the device-tree image in memory
         */
        ranges = lc_ranges;
        prev = NULL;
        while ((rlen -= np * sizeof(unsigned int)) >= 0) {
                if (prev) {
                        if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
                                (prev[2] + prev[na+4]) == ranges[2] &&
                                (prev[na+2] + prev[na+4]) == ranges[na+2]) {
                                prev[na+4] += ranges[na+4];
                                ranges[0] = 0;
                                ranges += np;
                                continue;
                        }
                }
                prev = ranges;
                ranges += np;
        }

        /*
         * The ranges property is laid out as an array of elements,
         * each of which comprises:
         *   cells 0 - 2:       a PCI address
         *   cells 3 or 3+4:    a CPU physical address
         *                      (size depending on dev->n_addr_cells)
         *   cells 4+5 or 5+6:  the size of the range
         */
        ranges = lc_ranges;
        rlen = orig_rlen;
        while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
                res = NULL;
                size = ranges[na+4];
                switch (ranges[0] >> 24) {
                case 1:         /* I/O space */
                        if (ranges[2] != 0)
                                break;
                        hose->io_base_phys = ranges[na+2];
                        /* limit I/O space to 16MB */
                        if (size > 0x01000000)
                                size = 0x01000000;
                        hose->io_base_virt = ioremap(ranges[na+2], size);
                        if (primary)
                                isa_io_base = (unsigned long) hose->io_base_virt;
                        res = &hose->io_resource;
                        res->flags = IORESOURCE_IO;
                        res->start = ranges[2];
                        break;
                case 2:         /* memory space */
                        memno = 0;
                        if (ranges[1] == 0 && ranges[2] == 0
                            && ranges[na+4] <= (16 << 20)) {
                                /* 1st 16MB, i.e. ISA memory area */
#if 0
                                if (primary)
                                        isa_mem_base = ranges[na+2];
#endif
                                memno = 1;
                        }
                        while (memno < 3 && hose->mem_resources[memno].flags)
                                ++memno;
                        if (memno == 0)
                                hose->pci_mem_offset = ranges[na+2] - ranges[2];
                        if (memno < 3) {
                                res = &hose->mem_resources[memno];
                                res->flags = IORESOURCE_MEM;
                                res->start = ranges[na+2];
                        }
                        break;
                }
                if (res != NULL) {
                        res->name = dev->full_name;
                        res->end = res->start + size - 1;
                        res->parent = NULL;
                        res->sibling = NULL;
                        res->child = NULL;
                }
                ranges += np;
        }
}

/*
 * 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;
        char* disp_name;
        int *bus_range;
        int primary = 1;
        struct property *of_prop;

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

        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 = alloc_bootmem(sizeof(struct pci_controller));
        if (hose == NULL)
                return -ENOMEM;
        pci_setup_pci_controller(hose);

        hose->arch_data = dev;
        hose->first_busno = bus_range ? bus_range[0] : 0;
        hose->last_busno = bus_range ? bus_range[1] : 0xff;

        of_prop = alloc_bootmem(sizeof(struct property) +
                                sizeof(hose->global_number));
        if (of_prop) {
                memset(of_prop, 0, sizeof(struct property));
                of_prop->name = "linux,pci-domain";
                of_prop->length = sizeof(hose->global_number);
                of_prop->value = (unsigned char *)&of_prop[1];
                memcpy(of_prop->value, &hose->global_number, sizeof(hose->global_number));
                prom_add_property(dev, of_prop);
        }

        disp_name = NULL;
        if (device_is_compatible(dev, "u3-agp")) {
                setup_u3_agp(hose);
                disp_name = "U3-AGP";
                primary = 0;
        } else if (device_is_compatible(dev, "u3-ht")) {
                setup_u3_ht(hose);
                disp_name = "U3-HT";
                primary = 1;
        }
        printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
                disp_name, hose->first_busno, hose->last_busno);

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

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

        return 0;
}

/*
 * We use our own read_irq_line here because PCI_INTERRUPT_PIN is
 * crap on some of Apple ASICs. We unconditionally use the Open Firmware
 * interrupt number as this is always right.
 */
static int pmac_pci_read_irq_line(struct pci_dev *pci_dev)
{
        struct device_node *node;

        node = pci_device_to_OF_node(pci_dev);
        if (node == NULL)
                return -1;
        if (node->n_intrs == 0)
                return -1;
        pci_dev->irq = node->intrs[0].line;
        pci_write_config_byte(pci_dev, PCI_INTERRUPT_LINE, pci_dev->irq);

        return 0;
}

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

        for_each_pci_dev(dev)
                pmac_pci_read_irq_line(dev);
}

static void __init pmac_fixup_phb_resources(void)
{
        struct pci_controller *hose, *tmp;
        
        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
                unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
                hose->io_resource.start += offset;
                hose->io_resource.end += offset;
                printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
                       hose->global_number,
                       hose->io_resource.start, hose->io_resource.end);
        }
}

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

        /* Probe root PCI hosts, that is on U3 the AGP host and the
         * HyperTransport host. That one is actually "kept" around
         * and actually added last as it's resource management relies
         * on the AGP resources to have been setup first
         */
        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, "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);

        /* Now setup the HyperTransport host if we found any
         */
        if (ht && add_bridge(ht) != 0)
                of_node_put(ht);

        /* Fixup the IO resources on our host bridges as the common code
         * does it only for childs of the host bridges
         */
        pmac_fixup_phb_resources();

        /* Setup the linkage between OF nodes and PHBs */ 
        pci_devs_phb_init();

        /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
         * assume there is no P2P bridge on the AGP bus, which should be a
         * safe assumptions hopefully.
         */
        if (u3_agp) {
                struct device_node *np = u3_agp->arch_data;
                np->busno = 0xf0;
                for (np = np->child; np; np = np->sibling)
                        np->busno = 0xf0;
        }

        pmac_check_ht_link();

        /* Tell pci.c to not use the common resource allocation mecanism */
        pci_probe_only = 1;
        
        /* Allow all IO */
        io_page_mask = -1;
}

/*
 * Disable second function on K2-SATA, it's broken
 * and disable IO BARs on first one
 */
static void 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, fixup_k2_sata);