/* pci.c: UltraSparc PCI controller support.
 *
 * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
 * Copyright (C) 1998, 1999 Eddie C. Dost   (ecd@skynet.be)
 * Copyright (C) 1999 Jakub Jelinek   (jj@ultra.linux.cz)
 *
 * OF tree based PCI bus probing taken from the PowerPC port
 * with minor modifications, see there for credits.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/irq.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/ebus.h>
#include <asm/isa.h>
#include <asm/prom.h>
#include <asm/apb.h>

#include "pci_impl.h"

#ifndef CONFIG_PCI
/* A "nop" PCI implementation. */
asmlinkage int sys_pciconfig_read(unsigned long bus, unsigned long dfn,
                                  unsigned long off, unsigned long len,
                                  unsigned char *buf)
{
        return 0;
}
asmlinkage int sys_pciconfig_write(unsigned long bus, unsigned long dfn,
                                   unsigned long off, unsigned long len,
                                   unsigned char *buf)
{
        return 0;
}
#else

/* List of all PCI controllers found in the system. */
struct pci_pbm_info *pci_pbm_root = NULL;

/* Each PBM found gets a unique index. */
int pci_num_pbms = 0;

volatile int pci_poke_in_progress;
volatile int pci_poke_cpu = -1;
volatile int pci_poke_faulted;

static DEFINE_SPINLOCK(pci_poke_lock);

void pci_config_read8(u8 *addr, u8 *ret)
{
        unsigned long flags;
        u8 byte;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "lduba [%1] %2, %0\n\t"
                             "membar #Sync"
                             : "=r" (byte)
                             : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        if (!pci_poke_faulted)
                *ret = byte;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

void pci_config_read16(u16 *addr, u16 *ret)
{
        unsigned long flags;
        u16 word;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "lduha [%1] %2, %0\n\t"
                             "membar #Sync"
                             : "=r" (word)
                             : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        if (!pci_poke_faulted)
                *ret = word;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

void pci_config_read32(u32 *addr, u32 *ret)
{
        unsigned long flags;
        u32 dword;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "lduwa [%1] %2, %0\n\t"
                             "membar #Sync"
                             : "=r" (dword)
                             : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        if (!pci_poke_faulted)
                *ret = dword;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

void pci_config_write8(u8 *addr, u8 val)
{
        unsigned long flags;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "stba %0, [%1] %2\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

void pci_config_write16(u16 *addr, u16 val)
{
        unsigned long flags;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "stha %0, [%1] %2\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

void pci_config_write32(u32 *addr, u32 val)
{
        unsigned long flags;

        spin_lock_irqsave(&pci_poke_lock, flags);
        pci_poke_cpu = smp_processor_id();
        pci_poke_in_progress = 1;
        pci_poke_faulted = 0;
        __asm__ __volatile__("membar #Sync\n\t"
                             "stwa %0, [%1] %2\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
                             : "memory");
        pci_poke_in_progress = 0;
        pci_poke_cpu = -1;
        spin_unlock_irqrestore(&pci_poke_lock, flags);
}

/* Probe for all PCI controllers in the system. */
extern void sabre_init(struct device_node *, const char *);
extern void psycho_init(struct device_node *, const char *);
extern void schizo_init(struct device_node *, const char *);
extern void schizo_plus_init(struct device_node *, const char *);
extern void tomatillo_init(struct device_node *, const char *);
extern void sun4v_pci_init(struct device_node *, const char *);
extern void fire_pci_init(struct device_node *, const char *);

static struct {
        char *model_name;
        void (*init)(struct device_node *, const char *);
} pci_controller_table[] __initdata = {
        { "SUNW,sabre", sabre_init },
        { "pci108e,a000", sabre_init },
        { "pci108e,a001", sabre_init },
        { "SUNW,psycho", psycho_init },
        { "pci108e,8000", psycho_init },
        { "SUNW,schizo", schizo_init },
        { "pci108e,8001", schizo_init },
        { "SUNW,schizo+", schizo_plus_init },
        { "pci108e,8002", schizo_plus_init },
        { "SUNW,tomatillo", tomatillo_init },
        { "pci108e,a801", tomatillo_init },
        { "SUNW,sun4v-pci", sun4v_pci_init },
        { "pciex108e,80f0", fire_pci_init },
};
#define PCI_NUM_CONTROLLER_TYPES        ARRAY_SIZE(pci_controller_table)

static int __init pci_controller_init(const char *model_name, int namelen, struct device_node *dp)
{
        int i;

        for (i = 0; i < PCI_NUM_CONTROLLER_TYPES; i++) {
                if (!strncmp(model_name,
                             pci_controller_table[i].model_name,
                             namelen)) {
                        pci_controller_table[i].init(dp, model_name);
                        return 1;
                }
        }

        return 0;
}

static int __init pci_controller_scan(int (*handler)(const char *, int, struct device_node *))
{
        struct device_node *dp;
        int count = 0;

        for_each_node_by_name(dp, "pci") {
                struct property *prop;
                int len;

                prop = of_find_property(dp, "model", &len);
                if (!prop)
                        prop = of_find_property(dp, "compatible", &len);

                if (prop) {
                        const char *model = prop->value;
                        int item_len = 0;

                        /* Our value may be a multi-valued string in the
                         * case of some compatible properties. For sanity,
                         * only try the first one.
                         */
                        while (model[item_len] && len) {
                                len--;
                                item_len++;
                        }

                        if (handler(model, item_len, dp))
                                count++;
                }
        }

        return count;
}

/* Find each controller in the system, attach and initialize
 * software state structure for each and link into the
 * pci_pbm_root.  Setup the controller enough such
 * that bus scanning can be done.
 */
static void __init pci_controller_probe(void)
{
        printk("PCI: Probing for controllers.\n");

        pci_controller_scan(pci_controller_init);
}

static int ofpci_verbose;

static int __init ofpci_debug(char *str)
{
        int val = 0;

        get_option(&str, &val);
        if (val)
                ofpci_verbose = 1;
        return 1;
}

__setup("ofpci_debug=", ofpci_debug);

static unsigned long pci_parse_of_flags(u32 addr0)
{
        unsigned long flags = 0;

        if (addr0 & 0x02000000) {
                flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
                flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
                flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
                if (addr0 & 0x40000000)
                        flags |= IORESOURCE_PREFETCH
                                 | PCI_BASE_ADDRESS_MEM_PREFETCH;
        } else if (addr0 & 0x01000000)
                flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
        return flags;
}

/* The of_device layer has translated all of the assigned-address properties
 * into physical address resources, we only have to figure out the register
 * mapping.
 */
static void pci_parse_of_addrs(struct of_device *op,
                               struct device_node *node,
                               struct pci_dev *dev)
{
        struct resource *op_res;
        const u32 *addrs;
        int proplen;

        addrs = of_get_property(node, "assigned-addresses", &proplen);
        if (!addrs)
                return;
        if (ofpci_verbose)
                printk("    parse addresses (%d bytes) @ %p\n",
                       proplen, addrs);
        op_res = &op->resource[0];
        for (; proplen >= 20; proplen -= 20, addrs += 5, op_res++) {
                struct resource *res;
                unsigned long flags;
                int i;

                flags = pci_parse_of_flags(addrs[0]);
                if (!flags)
                        continue;
                i = addrs[0] & 0xff;
                if (ofpci_verbose)
                        printk("  start: %lx, end: %lx, i: %x\n",
                               op_res->start, op_res->end, i);

                if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
                        res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
                } else if (i == dev->rom_base_reg) {
                        res = &dev->resource[PCI_ROM_RESOURCE];
                        flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
                } else {
                        printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
                        continue;
                }
                res->start = op_res->start;
                res->end = op_res->end;
                res->flags = flags;
                res->name = pci_name(dev);
        }
}

struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
                                  struct device_node *node,
                                  struct pci_bus *bus, int devfn)
{
        struct dev_archdata *sd;
        struct pci_dev *dev;
        const char *type;
        u32 class;

        dev = alloc_pci_dev();
        if (!dev)
                return NULL;

        sd = &dev->dev.archdata;
        sd->iommu = pbm->iommu;
        sd->stc = &pbm->stc;
        sd->host_controller = pbm;
        sd->prom_node = node;
        sd->op = of_find_device_by_node(node);

        sd = &sd->op->dev.archdata;
        sd->iommu = pbm->iommu;
        sd->stc = &pbm->stc;

        type = of_get_property(node, "device_type", NULL);
        if (type == NULL)
                type = "";

        if (ofpci_verbose)
                printk("    create device, devfn: %x, type: %s\n",
                       devfn, type);

        dev->bus = bus;
        dev->sysdata = node;
        dev->dev.parent = bus->bridge;
        dev->dev.bus = &pci_bus_type;
        dev->devfn = devfn;
        dev->multifunction = 0;         /* maybe a lie? */

        dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
        dev->device = of_getintprop_default(node, "device-id", 0xffff);
        dev->subsystem_vendor =
                of_getintprop_default(node, "subsystem-vendor-id", 0);
        dev->subsystem_device =
                of_getintprop_default(node, "subsystem-id", 0);

        dev->cfg_size = pci_cfg_space_size(dev);

        /* We can't actually use the firmware value, we have
         * to read what is in the register right now.  One
         * reason is that in the case of IDE interfaces the
         * firmware can sample the value before the the IDE
         * interface is programmed into native mode.
         */
        pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
        dev->class = class >> 8;
        dev->revision = class & 0xff;

        sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
                dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));

        if (ofpci_verbose)
                printk("    class: 0x%x device name: %s\n",
                       dev->class, pci_name(dev));

        /* I have seen IDE devices which will not respond to
         * the bmdma simplex check reads if bus mastering is
         * disabled.
         */
        if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
                pci_set_master(dev);

        dev->current_state = 4;         /* unknown power state */
        dev->error_state = pci_channel_io_normal;

        if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
                /* a PCI-PCI bridge */
                dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
                dev->rom_base_reg = PCI_ROM_ADDRESS1;
        } else if (!strcmp(type, "cardbus")) {
                dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
        } else {
                dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
                dev->rom_base_reg = PCI_ROM_ADDRESS;

                dev->irq = sd->op->irqs[0];
                if (dev->irq == 0xffffffff)
                        dev->irq = PCI_IRQ_NONE;
        }

        pci_parse_of_addrs(sd->op, node, dev);

        if (ofpci_verbose)
                printk("    adding to system ...\n");

        pci_device_add(dev, bus);

        return dev;
}

static void __devinit apb_calc_first_last(u8 map, u32 *first_p, u32 *last_p)
{
        u32 idx, first, last;

        first = 8;
        last = 0;
        for (idx = 0; idx < 8; idx++) {
                if ((map & (1 << idx)) != 0) {
                        if (first > idx)
                                first = idx;
                        if (last < idx)
                                last = idx;
                }
        }

        *first_p = first;
        *last_p = last;
}

static void pci_resource_adjust(struct resource *res,
                                struct resource *root)
{
        res->start += root->start;
        res->end += root->start;
}

/* For PCI bus devices which lack a 'ranges' property we interrogate
 * the config space values to set the resources, just like the generic
 * Linux PCI probing code does.
 */
static void __devinit pci_cfg_fake_ranges(struct pci_dev *dev,
                                          struct pci_bus *bus,
                                          struct pci_pbm_info *pbm)
{
        struct resource *res;
        u8 io_base_lo, io_limit_lo;
        u16 mem_base_lo, mem_limit_lo;
        unsigned long base, limit;

        pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
        pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
        base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
        limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;

        if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
                u16 io_base_hi, io_limit_hi;

                pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
                pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
                base |= (io_base_hi << 16);
                limit |= (io_limit_hi << 16);
        }

        res = bus->resource[0];
        if (base <= limit) {
                res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
                if (!res->start)
                        res->start = base;
                if (!res->end)
                        res->end = limit + 0xfff;
                pci_resource_adjust(res, &pbm->io_space);
        }

        pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
        pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
        base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
        limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;

        res = bus->resource[1];
        if (base <= limit) {
                res->flags = ((mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) |
                              IORESOURCE_MEM);
                res->start = base;
                res->end = limit + 0xfffff;
                pci_resource_adjust(res, &pbm->mem_space);
        }

        pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
        pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
        base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
        limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;

        if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
                u32 mem_base_hi, mem_limit_hi;

                pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
                pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);

                /*
                 * Some bridges set the base > limit by default, and some
                 * (broken) BIOSes do not initialize them.  If we find
                 * this, just assume they are not being used.
                 */
                if (mem_base_hi <= mem_limit_hi) {
                        base |= ((long) mem_base_hi) << 32;
                        limit |= ((long) mem_limit_hi) << 32;
                }
        }

        res = bus->resource[2];
        if (base <= limit) {
                res->flags = ((mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) |
                              IORESOURCE_MEM | IORESOURCE_PREFETCH);
                res->start = base;
                res->end = limit + 0xfffff;
                pci_resource_adjust(res, &pbm->mem_space);
        }
}

/* Cook up fake bus resources for SUNW,simba PCI bridges which lack
 * a proper 'ranges' property.
 */
static void __devinit apb_fake_ranges(struct pci_dev *dev,
                                      struct pci_bus *bus,
                                      struct pci_pbm_info *pbm)
{
        struct resource *res;
        u32 first, last;
        u8 map;

        pci_read_config_byte(dev, APB_IO_ADDRESS_MAP, &map);
        apb_calc_first_last(map, &first, &last);
        res = bus->resource[0];
        res->start = (first << 21);
        res->end = (last << 21) + ((1 << 21) - 1);
        res->flags = IORESOURCE_IO;
        pci_resource_adjust(res, &pbm->io_space);

        pci_read_config_byte(dev, APB_MEM_ADDRESS_MAP, &map);
        apb_calc_first_last(map, &first, &last);
        res = bus->resource[1];
        res->start = (first << 21);
        res->end = (last << 21) + ((1 << 21) - 1);
        res->flags = IORESOURCE_MEM;
        pci_resource_adjust(res, &pbm->mem_space);
}

static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
                                      struct device_node *node,
                                      struct pci_bus *bus);

#define GET_64BIT(prop, i)      ((((u64) (prop)[(i)]) << 32) | (prop)[(i)+1])

static void __devinit of_scan_pci_bridge(struct pci_pbm_info *pbm,
                                         struct device_node *node,
                                         struct pci_dev *dev)
{
        struct pci_bus *bus;
        const u32 *busrange, *ranges;
        int len, i, simba;
        struct resource *res;
        unsigned int flags;
        u64 size;

        if (ofpci_verbose)
                printk("of_scan_pci_bridge(%s)\n", node->full_name);

        /* parse bus-range property */
        busrange = of_get_property(node, "bus-range", &len);
        if (busrange == NULL || len != 8) {
                printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
                       node->full_name);
                return;
        }
        ranges = of_get_property(node, "ranges", &len);
        simba = 0;
        if (ranges == NULL) {
                const char *model = of_get_property(node, "model", NULL);
                if (model && !strcmp(model, "SUNW,simba"))
                        simba = 1;
        }

        bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
        if (!bus) {
                printk(KERN_ERR "Failed to create pci bus for %s\n",
                       node->full_name);
                return;
        }

        bus->primary = dev->bus->number;
        bus->subordinate = busrange[1];
        bus->bridge_ctl = 0;

        /* parse ranges property, or cook one up by hand for Simba */
        /* PCI #address-cells == 3 and #size-cells == 2 always */
        res = &dev->resource[PCI_BRIDGE_RESOURCES];
        for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
                res->flags = 0;
                bus->resource[i] = res;
                ++res;
        }
        if (simba) {
                apb_fake_ranges(dev, bus, pbm);
                goto after_ranges;
        } else if (ranges == NULL) {
                pci_cfg_fake_ranges(dev, bus, pbm);
                goto after_ranges;
        }
        i = 1;
        for (; len >= 32; len -= 32, ranges += 8) {
                struct resource *root;

                flags = pci_parse_of_flags(ranges[0]);
                size = GET_64BIT(ranges, 6);
                if (flags == 0 || size == 0)
                        continue;
                if (flags & IORESOURCE_IO) {
                        res = bus->resource[0];
                        if (res->flags) {
                                printk(KERN_ERR "PCI: ignoring extra I/O range"
                                       " for bridge %s\n", node->full_name);
                                continue;
                        }
                        root = &pbm->io_space;
                } else {
                        if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
                                printk(KERN_ERR "PCI: too many memory ranges"
                                       " for bridge %s\n", node->full_name);
                                continue;
                        }
                        res = bus->resource[i];
                        ++i;
                        root = &pbm->mem_space;
                }

                res->start = GET_64BIT(ranges, 1);
                res->end = res->start + size - 1;
                res->flags = flags;

                /* Another way to implement this would be to add an of_device
                 * layer routine that can calculate a resource for a given
                 * range property value in a PCI device.
                 */
                pci_resource_adjust(res, root);
        }
after_ranges:
        sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
                bus->number);
        if (ofpci_verbose)
                printk("    bus name: %s\n", bus->name);

        pci_of_scan_bus(pbm, node, bus);
}

static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
                                      struct device_node *node,
                                      struct pci_bus *bus)
{
        struct device_node *child;
        const u32 *reg;
        int reglen, devfn, prev_devfn;
        struct pci_dev *dev;

        if (ofpci_verbose)
                printk("PCI: scan_bus[%s] bus no %d\n",
                       node->full_name, bus->number);

        child = NULL;
        prev_devfn = -1;
        while ((child = of_get_next_child(node, child)) != NULL) {
                if (ofpci_verbose)
                        printk("  * %s\n", child->full_name);
                reg = of_get_property(child, "reg", &reglen);
                if (reg == NULL || reglen < 20)
                        continue;

                devfn = (reg[0] >> 8) & 0xff;

                /* This is a workaround for some device trees
                 * which list PCI devices twice.  On the V100
                 * for example, device number 3 is listed twice.
                 * Once as "pm" and once again as "lomp".
                 */
                if (devfn == prev_devfn)
                        continue;
                prev_devfn = devfn;

                /* create a new pci_dev for this device */
                dev = of_create_pci_dev(pbm, child, bus, devfn);
                if (!dev)
                        continue;
                if (ofpci_verbose)
                        printk("PCI: dev header type: %x\n",
                               dev->hdr_type);

                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
                    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
                        of_scan_pci_bridge(pbm, child, dev);
        }
}

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

        pdev = to_pci_dev(dev);
        dp = pdev->dev.archdata.prom_node;

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

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

static void __devinit pci_bus_register_of_sysfs(struct pci_bus *bus)
{
        struct pci_dev *dev;
        struct pci_bus *child_bus;
        int err;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                /* 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(&dev->dev.kobj, &dev_attr_obppath.attr);
        }
        list_for_each_entry(child_bus, &bus->children, node)
                pci_bus_register_of_sysfs(child_bus);
}

struct pci_bus * __devinit pci_scan_one_pbm(struct pci_pbm_info *pbm)
{
        struct device_node *node = pbm->prom_node;
        struct pci_bus *bus;

        printk("PCI: Scanning PBM %s\n", node->full_name);

        /* XXX parent device? XXX */
        bus = pci_create_bus(NULL, pbm->pci_first_busno, pbm->pci_ops, pbm);
        if (!bus) {
                printk(KERN_ERR "Failed to create bus for %s\n",
                       node->full_name);
                return NULL;
        }
        bus->secondary = pbm->pci_first_busno;
        bus->subordinate = pbm->pci_last_busno;

        bus->resource[0] = &pbm->io_space;
        bus->resource[1] = &pbm->mem_space;

        pci_of_scan_bus(pbm, node, bus);
        pci_bus_add_devices(bus);
        pci_bus_register_of_sysfs(bus);

        return bus;
}

static void __init pci_scan_each_controller_bus(void)
{
        struct pci_pbm_info *pbm;

        for (pbm = pci_pbm_root; pbm; pbm = pbm->next)
                pbm->scan_bus(pbm);
}

extern void power_init(void);

static int __init pcibios_init(void)
{
        pci_controller_probe();
        if (pci_pbm_root == NULL)
                return 0;

        pci_scan_each_controller_bus();

        isa_init();
        ebus_init();
        power_init();

        return 0;
}

subsys_initcall(pcibios_init);

void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
{
        struct pci_pbm_info *pbm = pbus->sysdata;

        /* Generic PCI bus probing sets these to point at
         * &io{port,mem}_resouce which is wrong for us.
         */
        pbus->resource[0] = &pbm->io_space;
        pbus->resource[1] = &pbm->mem_space;
}

struct resource *pcibios_select_root(struct pci_dev *pdev, struct resource *r)
{
        struct pci_pbm_info *pbm = pdev->bus->sysdata;
        struct resource *root = NULL;

        if (r->flags & IORESOURCE_IO)
                root = &pbm->io_space;
        if (r->flags & IORESOURCE_MEM)
                root = &pbm->mem_space;

        return root;
}

void pcibios_update_irq(struct pci_dev *pdev, int irq)
{
}

void pcibios_align_resource(void *data, struct resource *res,
                            resource_size_t size, resource_size_t align)
{
}

int pcibios_enable_device(struct pci_dev *dev, int mask)
{
        u16 cmd, oldcmd;
        int i;

        pci_read_config_word(dev, PCI_COMMAND, &cmd);
        oldcmd = cmd;

        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
                struct resource *res = &dev->resource[i];

                /* Only set up the requested stuff */
                if (!(mask & (1<<i)))
                        continue;

                if (res->flags & IORESOURCE_IO)
                        cmd |= PCI_COMMAND_IO;
                if (res->flags & IORESOURCE_MEM)
                        cmd |= PCI_COMMAND_MEMORY;
        }

        if (cmd != oldcmd) {
                printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
                       pci_name(dev), cmd);
                /* Enable the appropriate bits in the PCI command register.  */
                pci_write_config_word(dev, PCI_COMMAND, cmd);
        }
        return 0;
}

void pcibios_resource_to_bus(struct pci_dev *pdev, struct pci_bus_region *region,
                             struct resource *res)
{
        struct pci_pbm_info *pbm = pdev->bus->sysdata;
        struct resource zero_res, *root;

        zero_res.start = 0;
        zero_res.end = 0;
        zero_res.flags = res->flags;

        if (res->flags & IORESOURCE_IO)
                root = &pbm->io_space;
        else
                root = &pbm->mem_space;

        pci_resource_adjust(&zero_res, root);

        region->start = res->start - zero_res.start;
        region->end = res->end - zero_res.start;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

void pcibios_bus_to_resource(struct pci_dev *pdev, struct resource *res,
                             struct pci_bus_region *region)
{
        struct pci_pbm_info *pbm = pdev->bus->sysdata;
        struct resource *root;

        res->start = region->start;
        res->end = region->end;

        if (res->flags & IORESOURCE_IO)
                root = &pbm->io_space;
        else
                root = &pbm->mem_space;

        pci_resource_adjust(res, root);
}
EXPORT_SYMBOL(pcibios_bus_to_resource);

char * __devinit pcibios_setup(char *str)
{
        return str;
}

/* Platform support for /proc/bus/pci/X/Y mmap()s. */

/* If the user uses a host-bridge as the PCI device, he may use
 * this to perform a raw mmap() of the I/O or MEM space behind
 * that controller.
 *
 * This can be useful for execution of x86 PCI bios initialization code
 * on a PCI card, like the xfree86 int10 stuff does.
 */
static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma,
                                      enum pci_mmap_state mmap_state)
{
        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
        unsigned long space_size, user_offset, user_size;

        if (mmap_state == pci_mmap_io) {
                space_size = (pbm->io_space.end -
                              pbm->io_space.start) + 1;
        } else {
                space_size = (pbm->mem_space.end -
                              pbm->mem_space.start) + 1;
        }

        /* Make sure the request is in range. */
        user_offset = vma->vm_pgoff << PAGE_SHIFT;
        user_size = vma->vm_end - vma->vm_start;

        if (user_offset >= space_size ||
            (user_offset + user_size) > space_size)
                return -EINVAL;

        if (mmap_state == pci_mmap_io) {
                vma->vm_pgoff = (pbm->io_space.start +
                                 user_offset) >> PAGE_SHIFT;
        } else {
                vma->vm_pgoff = (pbm->mem_space.start +
                                 user_offset) >> PAGE_SHIFT;
        }

        return 0;
}

/* Adjust vm_pgoff of VMA such that it is the physical page offset
 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
 *
 * Basically, the user finds the base address for his device which he wishes
 * to mmap.  They read the 32-bit value from the config space base register,
 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
 *
 * Returns negative error code on failure, zero on success.
 */
static int __pci_mmap_make_offset(struct pci_dev *pdev,
                                  struct vm_area_struct *vma,
                                  enum pci_mmap_state mmap_state)
{
        unsigned long user_paddr, user_size;
        int i, err;

        /* First compute the physical address in vma->vm_pgoff,
         * making sure the user offset is within range in the
         * appropriate PCI space.

         */
        err = __pci_mmap_make_offset_bus(pdev, vma, mmap_state);
        if (err)
                return err;

        /* If this is a mapping on a host bridge, any address
         * is OK.
         */
        if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
                return err;

        /* Otherwise make sure it's in the range for one of the
         * device's resources.
         */
        user_paddr = vma->vm_pgoff << PAGE_SHIFT;
        user_size = vma->vm_end - vma->vm_start;

        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
                struct resource *rp = &pdev->resource[i];

                /* Active? */
                if (!rp->flags)
                        continue;

                /* Same type? */
                if (i == PCI_ROM_RESOURCE) {
                        if (mmap_state != pci_mmap_mem)
                                continue;
                } else {
                        if ((mmap_state == pci_mmap_io &&
                             (rp->flags & IORESOURCE_IO) == 0) ||
                            (mmap_state == pci_mmap_mem &&
                             (rp->flags & IORESOURCE_MEM) == 0))
                                continue;
                }

                if ((rp->start <= user_paddr) &&
                    (user_paddr + user_size) <= (rp->end + 1UL))
                        break;
        }

        if (i > PCI_ROM_RESOURCE)
                return -EINVAL;

        return 0;
}

/* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
 * mapping.
 */
static void __pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
                                            enum pci_mmap_state mmap_state)
{
        vma->vm_flags |= (VM_IO | VM_RESERVED);
}

/* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
 * device mapping.
 */
static void __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
                                             enum pci_mmap_state mmap_state)
{
        /* Our io_remap_pfn_range takes care of this, do nothing.  */
}

/* Perform the actual remap of the pages for a PCI device mapping, as appropriate
 * for this architecture.  The region in the process to map is described by vm_start
 * and vm_end members of VMA, the base physical address is found in vm_pgoff.
 * The pci device structure is provided so that architectures may make mapping
 * decisions on a per-device or per-bus basis.
 *
 * Returns a negative error code on failure, zero on success.
 */
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
                        enum pci_mmap_state mmap_state,
                        int write_combine)
{
        int ret;

        ret = __pci_mmap_make_offset(dev, vma, mmap_state);
        if (ret < 0)
                return ret;

        __pci_mmap_set_flags(dev, vma, mmap_state);
        __pci_mmap_set_pgprot(dev, vma, mmap_state);

        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
        ret = io_remap_pfn_range(vma, vma->vm_start,
                                 vma->vm_pgoff,
                                 vma->vm_end - vma->vm_start,
                                 vma->vm_page_prot);
        if (ret)
                return ret;

        return 0;
}

/* Return the domain nuber for this pci bus */

int pci_domain_nr(struct pci_bus *pbus)
{
        struct pci_pbm_info *pbm = pbus->sysdata;
        int ret;

        if (pbm == NULL || pbm->parent == NULL) {
                ret = -ENXIO;
        } else {
                ret = pbm->index;
        }

        return ret;
}
EXPORT_SYMBOL(pci_domain_nr);

#ifdef CONFIG_PCI_MSI
int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
{
        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
        int virt_irq;

        if (!pbm->setup_msi_irq)
                return -EINVAL;

        return pbm->setup_msi_irq(&virt_irq, pdev, desc);
}

void arch_teardown_msi_irq(unsigned int virt_irq)
{
        struct msi_desc *entry = get_irq_msi(virt_irq);
        struct pci_dev *pdev = entry->dev;
        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;

        if (!pbm->teardown_msi_irq)
                return;

        return pbm->teardown_msi_irq(virt_irq, pdev);
}
#endif /* !(CONFIG_PCI_MSI) */

struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
{
        return pdev->dev.archdata.prom_node;
}
EXPORT_SYMBOL(pci_device_to_OF_node);

static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
{
        struct pci_dev *ali_isa_bridge;
        u8 val;

        /* ALI sound chips generate 31-bits of DMA, a special register
         * determines what bit 31 is emitted as.
         */
        ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL,
                                         PCI_DEVICE_ID_AL_M1533,
                                         NULL);

        pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
        if (set_bit)
                val |= 0x01;
        else
                val &= ~0x01;
        pci_write_config_byte(ali_isa_bridge, 0x7e, val);
        pci_dev_put(ali_isa_bridge);
}

int pci_dma_supported(struct pci_dev *pdev, u64 device_mask)
{
        u64 dma_addr_mask;

        if (pdev == NULL) {
                dma_addr_mask = 0xffffffff;
        } else {
                struct iommu *iommu = pdev->dev.archdata.iommu;

                dma_addr_mask = iommu->dma_addr_mask;

                if (pdev->vendor == PCI_VENDOR_ID_AL &&
                    pdev->device == PCI_DEVICE_ID_AL_M5451 &&
                    device_mask == 0x7fffffff) {
                        ali_sound_dma_hack(pdev,
                                           (dma_addr_mask & 0x80000000) != 0);
                        return 1;
                }
        }

        if (device_mask >= (1UL << 32UL))
                return 0;

        return (device_mask & dma_addr_mask) == dma_addr_mask;
}

void pci_resource_to_user(const struct pci_dev *pdev, int bar,
                          const struct resource *rp, resource_size_t *start,
                          resource_size_t *end)
{
        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
        unsigned long offset;

        if (rp->flags & IORESOURCE_IO)
                offset = pbm->io_space.start;
        else
                offset = pbm->mem_space.start;

        *start = rp->start - offset;
        *end = rp->end - offset;
}

#endif /* !(CONFIG_PCI) */