Linux 2.6.21

[linux/fpc-iii.git] / arch / sparc64 / kernel / pci_common.c

/* $Id: pci_common.c,v 1.29 2002/02/01 00:56:03 davem Exp $
 * pci_common.c: PCI controller common support.
 *
 * Copyright (C) 1999 David S. Miller (davem@redhat.com)
 */

#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/device.h>

#include <asm/pbm.h>
#include <asm/prom.h>
#include <asm/of_device.h>

#include "pci_impl.h"

/* Fix self device of BUS and hook it into BUS->self.
 * The pci_scan_bus does not do this for the host bridge.
 */
void __init pci_fixup_host_bridge_self(struct pci_bus *pbus)
{
        struct pci_dev *pdev;

        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                if (pdev->class >> 8 == PCI_CLASS_BRIDGE_HOST) {
                        pbus->self = pdev;
                        return;
                }
        }

        prom_printf("PCI: Critical error, cannot find host bridge PDEV.\n");
        prom_halt();
}

/* Find the OBP PROM device tree node for a PCI device.  */
static struct device_node * __init
find_device_prom_node(struct pci_pbm_info *pbm, struct pci_dev *pdev,
                      struct device_node *bus_node,
                      struct linux_prom_pci_registers **pregs,
                      int *nregs)
{
        struct device_node *dp;

        *nregs = 0;

        /*
         * Return the PBM's PROM node in case we are it's PCI device,
         * as the PBM's reg property is different to standard PCI reg
         * properties. We would delete this device entry otherwise,
         * which confuses XFree86's device probing...
         */
        if ((pdev->bus->number == pbm->pci_bus->number) && (pdev->devfn == 0) &&
            (pdev->vendor == PCI_VENDOR_ID_SUN) &&
            (pdev->device == PCI_DEVICE_ID_SUN_PBM ||
             pdev->device == PCI_DEVICE_ID_SUN_SCHIZO ||
             pdev->device == PCI_DEVICE_ID_SUN_TOMATILLO ||
             pdev->device == PCI_DEVICE_ID_SUN_SABRE ||
             pdev->device == PCI_DEVICE_ID_SUN_HUMMINGBIRD))
                return bus_node;

        dp = bus_node->child;
        while (dp) {
                struct linux_prom_pci_registers *regs;
                struct property *prop;
                int len;

                prop = of_find_property(dp, "reg", &len);
                if (!prop)
                        goto do_next_sibling;

                regs = prop->value;
                if (((regs[0].phys_hi >> 8) & 0xff) == pdev->devfn) {
                        *pregs = regs;
                        *nregs = len / sizeof(struct linux_prom_pci_registers);
                        return dp;
                }

        do_next_sibling:
                dp = dp->sibling;
        }

        return NULL;
}

/* Older versions of OBP on PCI systems encode 64-bit MEM
 * space assignments incorrectly, this fixes them up.  We also
 * take the opportunity here to hide other kinds of bogus
 * assignments.
 */
static void __init fixup_obp_assignments(struct pci_dev *pdev,
                                         struct pcidev_cookie *pcp)
{
        int i;

        if (pdev->vendor == PCI_VENDOR_ID_AL &&
            (pdev->device == PCI_DEVICE_ID_AL_M7101 ||
             pdev->device == PCI_DEVICE_ID_AL_M1533)) {
                int i;

                /* Zap all of the normal resources, they are
                 * meaningless and generate bogus resource collision
                 * messages.  This is OpenBoot's ill-fated attempt to
                 * represent the implicit resources that these devices
                 * have.
                 */
                pcp->num_prom_assignments = 0;
                for (i = 0; i < 6; i++) {
                        pdev->resource[i].start =
                                pdev->resource[i].end =
                                pdev->resource[i].flags = 0;
                }
                pdev->resource[PCI_ROM_RESOURCE].start =
                        pdev->resource[PCI_ROM_RESOURCE].end =
                        pdev->resource[PCI_ROM_RESOURCE].flags = 0;
                return;
        }

        for (i = 0; i < pcp->num_prom_assignments; i++) {
                struct linux_prom_pci_registers *ap;
                int space;

                ap = &pcp->prom_assignments[i];
                space = ap->phys_hi >> 24;
                if ((space & 0x3) == 2 &&
                    (space & 0x4) != 0) {
                        ap->phys_hi &= ~(0x7 << 24);
                        ap->phys_hi |= 0x3 << 24;
                }
        }
}

static ssize_t
show_pciobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
{
        struct pci_dev *pdev;
        struct pcidev_cookie *sysdata;

        pdev = to_pci_dev(dev);
        sysdata = pdev->sysdata;

        return snprintf (buf, PAGE_SIZE, "%s\n", sysdata->prom_node->full_name);
}

static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_pciobppath_attr, NULL);

/* Fill in the PCI device cookie sysdata for the given
 * PCI device.  This cookie is the means by which one
 * can get to OBP and PCI controller specific information
 * for a PCI device.
 */
static void __init pdev_cookie_fillin(struct pci_pbm_info *pbm,
                                      struct pci_dev *pdev,
                                      struct device_node *bus_node)
{
        struct linux_prom_pci_registers *pregs = NULL;
        struct pcidev_cookie *pcp;
        struct device_node *dp;
        struct property *prop;
        int nregs, len, err;

        dp = find_device_prom_node(pbm, pdev, bus_node,
                                   &pregs, &nregs);
        if (!dp) {
                /* If it is not in the OBP device tree then
                 * there must be a damn good reason for it.
                 *
                 * So what we do is delete the device from the
                 * PCI device tree completely.  This scenario
                 * is seen, for example, on CP1500 for the
                 * second EBUS/HappyMeal pair if the external
                 * connector for it is not present.
                 */
                pci_remove_bus_device(pdev);
                return;
        }

        pcp = kzalloc(sizeof(*pcp), GFP_ATOMIC);
        if (pcp == NULL) {
                prom_printf("PCI_COOKIE: Fatal malloc error, aborting...\n");
                prom_halt();
        }
        pcp->pbm = pbm;
        pcp->prom_node = dp;
        pcp->op = of_find_device_by_node(dp);
        memcpy(pcp->prom_regs, pregs,
               nregs * sizeof(struct linux_prom_pci_registers));
        pcp->num_prom_regs = nregs;

        /* We can't have the pcidev_cookie assignments be just
         * direct pointers into the property value, since they
         * are potentially modified by the probing process.
         */
        prop = of_find_property(dp, "assigned-addresses", &len);
        if (!prop) {
                pcp->num_prom_assignments = 0;
        } else {
                memcpy(pcp->prom_assignments, prop->value, len);
                pcp->num_prom_assignments =
                        (len / sizeof(pcp->prom_assignments[0]));
        }

        if (strcmp(dp->name, "ebus") == 0) {
                struct linux_prom_ebus_ranges *erng;
                int iter;

                /* EBUS is special... */
                prop = of_find_property(dp, "ranges", &len);
                if (!prop) {
                        prom_printf("EBUS: Fatal error, no range property\n");
                        prom_halt();
                }
                erng = prop->value;
                len = (len / sizeof(erng[0]));
                for (iter = 0; iter < len; iter++) {
                        struct linux_prom_ebus_ranges *ep = &erng[iter];
                        struct linux_prom_pci_registers *ap;

                        ap = &pcp->prom_assignments[iter];

                        ap->phys_hi = ep->parent_phys_hi;
                        ap->phys_mid = ep->parent_phys_mid;
                        ap->phys_lo = ep->parent_phys_lo;
                        ap->size_hi = 0;
                        ap->size_lo = ep->size;
                }
                pcp->num_prom_assignments = len;
        }

        fixup_obp_assignments(pdev, pcp);

        pdev->sysdata = pcp;

        /* we don't really care if we can create this file or not,
         * but we need to assign the result of the call or the world will fall
         * under alien invasion and everybody will be frozen on a spaceship
         * ready to be eaten on alpha centauri by some green and jelly humanoid.
         */
        err = sysfs_create_file(&pdev->dev.kobj, &dev_attr_obppath.attr);
}

void __init pci_fill_in_pbm_cookies(struct pci_bus *pbus,
                                    struct pci_pbm_info *pbm,
                                    struct device_node *dp)
{
        struct pci_dev *pdev, *pdev_next;
        struct pci_bus *this_pbus, *pbus_next;

        /* This must be _safe because the cookie fillin
           routine can delete devices from the tree.  */
        list_for_each_entry_safe(pdev, pdev_next, &pbus->devices, bus_list)
                pdev_cookie_fillin(pbm, pdev, dp);

        list_for_each_entry_safe(this_pbus, pbus_next, &pbus->children, node) {
                struct pcidev_cookie *pcp = this_pbus->self->sysdata;

                pci_fill_in_pbm_cookies(this_pbus, pbm, pcp->prom_node);
        }
}

static void __init bad_assignment(struct pci_dev *pdev,
                                  struct linux_prom_pci_registers *ap,
                                  struct resource *res,
                                  int do_prom_halt)
{
        prom_printf("PCI: Bogus PROM assignment. BUS[%02x] DEVFN[%x]\n",
                    pdev->bus->number, pdev->devfn);
        if (ap)
                prom_printf("PCI: phys[%08x:%08x:%08x] size[%08x:%08x]\n",
                            ap->phys_hi, ap->phys_mid, ap->phys_lo,
                            ap->size_hi, ap->size_lo);
        if (res)
                prom_printf("PCI: RES[%016lx-->%016lx:(%lx)]\n",
                            res->start, res->end, res->flags);
        if (do_prom_halt)
                prom_halt();
}

static struct resource *
__init get_root_resource(struct linux_prom_pci_registers *ap,
                         struct pci_pbm_info *pbm)
{
        int space = (ap->phys_hi >> 24) & 3;

        switch (space) {
        case 0:
                /* Configuration space, silently ignore it. */
                return NULL;

        case 1:
                /* 16-bit IO space */
                return &pbm->io_space;

        case 2:
                /* 32-bit MEM space */
                return &pbm->mem_space;

        case 3:
                /* 64-bit MEM space, these are allocated out of
                 * the 32-bit mem_space range for the PBM, ie.
                 * we just zero out the upper 32-bits.
                 */
                return &pbm->mem_space;

        default:
                printk("PCI: What is resource space %x?\n", space);
                return NULL;
        };
}

static struct resource *
__init get_device_resource(struct linux_prom_pci_registers *ap,
                           struct pci_dev *pdev)
{
        struct resource *res;
        int breg = (ap->phys_hi & 0xff);

        switch (breg) {
        case  PCI_ROM_ADDRESS:
                /* Unfortunately I have seen several cases where
                 * buggy FCODE uses a space value of '1' (I/O space)
                 * in the register property for the ROM address
                 * so disable this sanity check for now.
                 */
#if 0
        {
                int space = (ap->phys_hi >> 24) & 3;

                /* It had better be MEM space. */
                if (space != 2)
                        bad_assignment(pdev, ap, NULL, 0);
        }
#endif
                res = &pdev->resource[PCI_ROM_RESOURCE];
                break;

        case PCI_BASE_ADDRESS_0:
        case PCI_BASE_ADDRESS_1:
        case PCI_BASE_ADDRESS_2:
        case PCI_BASE_ADDRESS_3:
        case PCI_BASE_ADDRESS_4:
        case PCI_BASE_ADDRESS_5:
                res = &pdev->resource[(breg - PCI_BASE_ADDRESS_0) / 4];
                break;

        default:
                bad_assignment(pdev, ap, NULL, 0);
                res = NULL;
                break;
        };

        return res;
}

static void __init pdev_record_assignments(struct pci_pbm_info *pbm,
                                           struct pci_dev *pdev)
{
        struct pcidev_cookie *pcp = pdev->sysdata;
        int i;

        for (i = 0; i < pcp->num_prom_assignments; i++) {
                struct linux_prom_pci_registers *ap;
                struct resource *root, *res;

                /* The format of this property is specified in
                 * the PCI Bus Binding to IEEE1275-1994.
                 */
                ap = &pcp->prom_assignments[i];
                root = get_root_resource(ap, pbm);
                res = get_device_resource(ap, pdev);
                if (root == NULL || res == NULL ||
                    res->flags == 0)
                        continue;

                /* Ok we know which resource this PROM assignment is
                 * for, sanity check it.
                 */
                if ((res->start & 0xffffffffUL) != ap->phys_lo)
                        bad_assignment(pdev, ap, res, 1);

                /* If it is a 64-bit MEM space assignment, verify that
                 * the resource is too and that the upper 32-bits match.
                 */
                if (((ap->phys_hi >> 24) & 3) == 3) {
                        if (((res->flags & IORESOURCE_MEM) == 0) ||
                            ((res->flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK)
                             != PCI_BASE_ADDRESS_MEM_TYPE_64))
                                bad_assignment(pdev, ap, res, 1);
                        if ((res->start >> 32) != ap->phys_mid)
                                bad_assignment(pdev, ap, res, 1);

                        /* PBM cannot generate cpu initiated PIOs
                         * to the full 64-bit space.  Therefore the
                         * upper 32-bits better be zero.  If it is
                         * not, just skip it and we will assign it
                         * properly ourselves.
                         */
                        if ((res->start >> 32) != 0UL) {
                                printk(KERN_ERR "PCI: OBP assigns out of range MEM address "
                                       "%016lx for region %ld on device %s\n",
                                       res->start, (res - &pdev->resource[0]), pci_name(pdev));
                                continue;
                        }
                }

                /* Adjust the resource into the physical address space
                 * of this PBM.
                 */
                pbm->parent->resource_adjust(pdev, res, root);

                if (request_resource(root, res) < 0) {
                        int rnum;

                        /* OK, there is some conflict.  But this is fine
                         * since we'll reassign it in the fixup pass.
                         *
                         * Do not print the warning for ROM resources
                         * as such a conflict is quite common and
                         * harmless as the ROM bar is disabled.
                         */
                        rnum = (res - &pdev->resource[0]);
                        if (rnum != PCI_ROM_RESOURCE)
                                printk(KERN_ERR "PCI: Resource collision, "
                                       "region %d "
                                       "[%016lx:%016lx] of device %s\n",
                                       rnum,
                                       res->start, res->end,
                                       pci_name(pdev));
                }
        }
}

void __init pci_record_assignments(struct pci_pbm_info *pbm,
                                   struct pci_bus *pbus)
{
        struct pci_dev *dev;
        struct pci_bus *bus;

        list_for_each_entry(dev, &pbus->devices, bus_list)
                pdev_record_assignments(pbm, dev);

        list_for_each_entry(bus, &pbus->children, node)
                pci_record_assignments(pbm, bus);
}

/* Return non-zero if PDEV has implicit I/O resources even
 * though it may not have an I/O base address register
 * active.
 */
static int __init has_implicit_io(struct pci_dev *pdev)
{
        int class = pdev->class >> 8;

        if (class == PCI_CLASS_NOT_DEFINED ||
            class == PCI_CLASS_NOT_DEFINED_VGA ||
            class == PCI_CLASS_STORAGE_IDE ||
            (pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
                return 1;

        return 0;
}

static void __init pdev_assign_unassigned(struct pci_pbm_info *pbm,
                                          struct pci_dev *pdev)
{
        u32 reg;
        u16 cmd;
        int i, io_seen, mem_seen;

        io_seen = mem_seen = 0;
        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
                struct resource *root, *res;
                unsigned long size, min, max, align;

                res = &pdev->resource[i];

                if (res->flags & IORESOURCE_IO)
                        io_seen++;
                else if (res->flags & IORESOURCE_MEM)
                        mem_seen++;

                /* If it is already assigned or the resource does
                 * not exist, there is nothing to do.
                 */
                if (res->parent != NULL || res->flags == 0UL)
                        continue;

                /* Determine the root we allocate from. */
                if (res->flags & IORESOURCE_IO) {
                        root = &pbm->io_space;
                        min = root->start + 0x400UL;
                        max = root->end;
                } else {
                        root = &pbm->mem_space;
                        min = root->start;
                        max = min + 0x80000000UL;
                }

                size = res->end - res->start;
                align = size + 1;
                if (allocate_resource(root, res, size + 1, min, max, align, NULL, NULL) < 0) {
                        /* uh oh */
                        prom_printf("PCI: Failed to allocate resource %d for %s\n",
                                    i, pci_name(pdev));
                        prom_halt();
                }

                /* Update PCI config space. */
                pbm->parent->base_address_update(pdev, i);
        }

        /* Special case, disable the ROM.  Several devices
         * act funny (ie. do not respond to memory space writes)
         * when it is left enabled.  A good example are Qlogic,ISP
         * adapters.
         */
        pci_read_config_dword(pdev, PCI_ROM_ADDRESS, &reg);
        reg &= ~PCI_ROM_ADDRESS_ENABLE;
        pci_write_config_dword(pdev, PCI_ROM_ADDRESS, reg);

        /* If we saw I/O or MEM resources, enable appropriate
         * bits in PCI command register.
         */
        if (io_seen || mem_seen) {
                pci_read_config_word(pdev, PCI_COMMAND, &cmd);
                if (io_seen || has_implicit_io(pdev))
                        cmd |= PCI_COMMAND_IO;
                if (mem_seen)
                        cmd |= PCI_COMMAND_MEMORY;
                pci_write_config_word(pdev, PCI_COMMAND, cmd);
        }

        /* If this is a PCI bridge or an IDE controller,
         * enable bus mastering.  In the former case also
         * set the cache line size correctly.
         */
        if (((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI) ||
            (((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) &&
             ((pdev->class & 0x80) != 0))) {
                pci_read_config_word(pdev, PCI_COMMAND, &cmd);
                cmd |= PCI_COMMAND_MASTER;
                pci_write_config_word(pdev, PCI_COMMAND, cmd);

                if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
                        pci_write_config_byte(pdev,
                                              PCI_CACHE_LINE_SIZE,
                                              (64 / sizeof(u32)));
        }
}

void __init pci_assign_unassigned(struct pci_pbm_info *pbm,
                                  struct pci_bus *pbus)
{
        struct pci_dev *dev;
        struct pci_bus *bus;

        list_for_each_entry(dev, &pbus->devices, bus_list)
                pdev_assign_unassigned(pbm, dev);

        list_for_each_entry(bus, &pbus->children, node)
                pci_assign_unassigned(pbm, bus);
}

static void __init pdev_fixup_irq(struct pci_dev *pdev)
{
        struct pcidev_cookie *pcp = pdev->sysdata;
        struct of_device *op = pcp->op;

        if (op->irqs[0] == 0xffffffff) {
                pdev->irq = PCI_IRQ_NONE;
                return;
        }

        pdev->irq = op->irqs[0];

        pci_write_config_byte(pdev, PCI_INTERRUPT_LINE,
                              pdev->irq & PCI_IRQ_INO);
}

void __init pci_fixup_irq(struct pci_pbm_info *pbm,
                          struct pci_bus *pbus)
{
        struct pci_dev *dev;
        struct pci_bus *bus;

        list_for_each_entry(dev, &pbus->devices, bus_list)
                pdev_fixup_irq(dev);

        list_for_each_entry(bus, &pbus->children, node)
                pci_fixup_irq(pbm, bus);
}

static void pdev_setup_busmastering(struct pci_dev *pdev, int is_66mhz)
{
        u16 cmd;
        u8 hdr_type, min_gnt, ltimer;

        pci_read_config_word(pdev, PCI_COMMAND, &cmd);
        cmd |= PCI_COMMAND_MASTER;
        pci_write_config_word(pdev, PCI_COMMAND, cmd);

        /* Read it back, if the mastering bit did not
         * get set, the device does not support bus
         * mastering so we have nothing to do here.
         */
        pci_read_config_word(pdev, PCI_COMMAND, &cmd);
        if ((cmd & PCI_COMMAND_MASTER) == 0)
                return;

        /* Set correct cache line size, 64-byte on all
         * Sparc64 PCI systems.  Note that the value is
         * measured in 32-bit words.
         */
        pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
                              64 / sizeof(u32));

        pci_read_config_byte(pdev, PCI_HEADER_TYPE, &hdr_type);
        hdr_type &= ~0x80;
        if (hdr_type != PCI_HEADER_TYPE_NORMAL)
                return;

        /* If the latency timer is already programmed with a non-zero
         * value, assume whoever set it (OBP or whoever) knows what
         * they are doing.
         */
        pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &ltimer);
        if (ltimer != 0)
                return;

        /* XXX Since I'm tipping off the min grant value to
         * XXX choose a suitable latency timer value, I also
         * XXX considered making use of the max latency value
         * XXX as well.  Unfortunately I've seen too many bogusly
         * XXX low settings for it to the point where it lacks
         * XXX any usefulness.  In one case, an ethernet card
         * XXX claimed a min grant of 10 and a max latency of 5.
         * XXX Now, if I had two such cards on the same bus I
         * XXX could not set the desired burst period (calculated
         * XXX from min grant) without violating the max latency
         * XXX bound.  Duh...
         * XXX
         * XXX I blame dumb PC bios implementors for stuff like
         * XXX this, most of them don't even try to do something
         * XXX sensible with latency timer values and just set some
         * XXX default value (usually 32) into every device.
         */

        pci_read_config_byte(pdev, PCI_MIN_GNT, &min_gnt);

        if (min_gnt == 0) {
                /* If no min_gnt setting then use a default
                 * value.
                 */
                if (is_66mhz)
                        ltimer = 16;
                else
                        ltimer = 32;
        } else {
                int shift_factor;

                if (is_66mhz)
                        shift_factor = 2;
                else
                        shift_factor = 3;

                /* Use a default value when the min_gnt value
                 * is erroneously high.
                 */
                if (((unsigned int) min_gnt << shift_factor) > 512 ||
                    ((min_gnt << shift_factor) & 0xff) == 0) {
                        ltimer = 8 << shift_factor;
                } else {
                        ltimer = min_gnt << shift_factor;
                }
        }

        pci_write_config_byte(pdev, PCI_LATENCY_TIMER, ltimer);
}

void pci_determine_66mhz_disposition(struct pci_pbm_info *pbm,
                                     struct pci_bus *pbus)
{
        struct pci_dev *pdev;
        int all_are_66mhz;
        u16 status;

        if (pbm->is_66mhz_capable == 0) {
                all_are_66mhz = 0;
                goto out;
        }

        all_are_66mhz = 1;
        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                pci_read_config_word(pdev, PCI_STATUS, &status);
                if (!(status & PCI_STATUS_66MHZ)) {
                        all_are_66mhz = 0;
                        break;
                }
        }
out:
        pbm->all_devs_66mhz = all_are_66mhz;

        printk("PCI%d(PBM%c): Bus running at %dMHz\n",
               pbm->parent->index,
               (pbm == &pbm->parent->pbm_A) ? 'A' : 'B',
               (all_are_66mhz ? 66 : 33));
}

void pci_setup_busmastering(struct pci_pbm_info *pbm,
                            struct pci_bus *pbus)
{
        struct pci_dev *dev;
        struct pci_bus *bus;
        int is_66mhz;

        is_66mhz = pbm->is_66mhz_capable && pbm->all_devs_66mhz;

        list_for_each_entry(dev, &pbus->devices, bus_list)
                pdev_setup_busmastering(dev, is_66mhz);

        list_for_each_entry(bus, &pbus->children, node)
                pci_setup_busmastering(pbm, bus);
}

void pci_register_legacy_regions(struct resource *io_res,
                                 struct resource *mem_res)
{
        struct resource *p;

        /* VGA Video RAM. */
        p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return;

        p->name = "Video RAM area";
        p->start = mem_res->start + 0xa0000UL;
        p->end = p->start + 0x1ffffUL;
        p->flags = IORESOURCE_BUSY;
        request_resource(mem_res, p);

        p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return;

        p->name = "System ROM";
        p->start = mem_res->start + 0xf0000UL;
        p->end = p->start + 0xffffUL;
        p->flags = IORESOURCE_BUSY;
        request_resource(mem_res, p);

        p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return;

        p->name = "Video ROM";
        p->start = mem_res->start + 0xc0000UL;
        p->end = p->start + 0x7fffUL;
        p->flags = IORESOURCE_BUSY;
        request_resource(mem_res, p);
}

/* Generic helper routines for PCI error reporting. */
void pci_scan_for_target_abort(struct pci_controller_info *p,
                               struct pci_pbm_info *pbm,
                               struct pci_bus *pbus)
{
        struct pci_dev *pdev;
        struct pci_bus *bus;

        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                u16 status, error_bits;

                pci_read_config_word(pdev, PCI_STATUS, &status);
                error_bits =
                        (status & (PCI_STATUS_SIG_TARGET_ABORT |
                                   PCI_STATUS_REC_TARGET_ABORT));
                if (error_bits) {
                        pci_write_config_word(pdev, PCI_STATUS, error_bits);
                        printk("PCI%d(PBM%c): Device [%s] saw Target Abort [%016x]\n",
                               p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
                               pci_name(pdev), status);
                }
        }

        list_for_each_entry(bus, &pbus->children, node)
                pci_scan_for_target_abort(p, pbm, bus);
}

void pci_scan_for_master_abort(struct pci_controller_info *p,
                               struct pci_pbm_info *pbm,
                               struct pci_bus *pbus)
{
        struct pci_dev *pdev;
        struct pci_bus *bus;

        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                u16 status, error_bits;

                pci_read_config_word(pdev, PCI_STATUS, &status);
                error_bits =
                        (status & (PCI_STATUS_REC_MASTER_ABORT));
                if (error_bits) {
                        pci_write_config_word(pdev, PCI_STATUS, error_bits);
                        printk("PCI%d(PBM%c): Device [%s] received Master Abort [%016x]\n",
                               p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
                               pci_name(pdev), status);
                }
        }

        list_for_each_entry(bus, &pbus->children, node)
                pci_scan_for_master_abort(p, pbm, bus);
}

void pci_scan_for_parity_error(struct pci_controller_info *p,
                               struct pci_pbm_info *pbm,
                               struct pci_bus *pbus)
{
        struct pci_dev *pdev;
        struct pci_bus *bus;

        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                u16 status, error_bits;

                pci_read_config_word(pdev, PCI_STATUS, &status);
                error_bits =
                        (status & (PCI_STATUS_PARITY |
                                   PCI_STATUS_DETECTED_PARITY));
                if (error_bits) {
                        pci_write_config_word(pdev, PCI_STATUS, error_bits);
                        printk("PCI%d(PBM%c): Device [%s] saw Parity Error [%016x]\n",
                               p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
                               pci_name(pdev), status);
                }
        }

        list_for_each_entry(bus, &pbus->children, node)
                pci_scan_for_parity_error(p, pbm, bus);
}