// SPDX-License-Identifier: GPL-2.0
/* 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/export.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 <linux/of.h>
#include <linux/of_device.h>

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

#include "pci_impl.h"
#include "kernel.h"

/* 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);
}

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 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
                if (addr0 & 0x01000000)
                        flags |= IORESOURCE_MEM_64
                                 | PCI_BASE_ADDRESS_MEM_TYPE_64;
                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 platform_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)
                pci_info(dev, "    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)
                        pci_info(dev, "  start: %llx, end: %llx, 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_SIZEALIGN;
                } else {
                        pci_err(dev, "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);

                pci_info(dev, "reg 0x%x: %pR\n", i, res);
        }
}

static void pci_init_dev_archdata(struct dev_archdata *sd, void *iommu,
                                  void *stc, void *host_controller,
                                  struct platform_device  *op,
                                  int numa_node)
{
        sd->iommu = iommu;
        sd->stc = stc;
        sd->host_controller = host_controller;
        sd->op = op;
        sd->numa_node = numa_node;
}

static 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 platform_device *op;
        struct pci_dev *dev;
        u32 class;

        dev = pci_alloc_dev(bus);
        if (!dev)
                return NULL;

        op = of_find_device_by_node(node);
        sd = &dev->dev.archdata;
        pci_init_dev_archdata(sd, pbm->iommu, &pbm->stc, pbm, op,
                              pbm->numa_node);
        sd = &op->dev.archdata;
        sd->iommu = pbm->iommu;
        sd->stc = &pbm->stc;
        sd->numa_node = pbm->numa_node;

        if (of_node_name_eq(node, "ebus"))
                of_propagate_archdata(op);

        if (ofpci_verbose)
                pci_info(bus,"    create device, devfn: %x, type: %s\n",
                         devfn, of_node_get_device_type(node));

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

        pci_dev_assign_slot(dev);
        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;

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

        /* 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 = PCI_UNKNOWN;       /* unknown power state */
        dev->error_state = pci_channel_io_normal;
        dev->dma_mask = 0xffffffff;

        if (of_node_name_eq(node, "pci")) {
                /* a PCI-PCI bridge */
                dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
                dev->rom_base_reg = PCI_ROM_ADDRESS1;
        } else if (of_node_is_type(node, "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->archdata.irqs[0];
                if (dev->irq == 0xffffffff)
                        dev->irq = PCI_IRQ_NONE;
        }

        pci_info(dev, "[%04x:%04x] type %02x class %#08x\n",
                 dev->vendor, dev->device, dev->hdr_type, dev->class);

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

        if (ofpci_verbose)
                pci_info(dev, "    adding to system ...\n");

        pci_device_add(dev, bus);

        return dev;
}

static void 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;
}

/* Cook up fake bus resources for SUNW,simba PCI bridges which lack
 * a proper 'ranges' property.
 */
static void apb_fake_ranges(struct pci_dev *dev,
                            struct pci_bus *bus,
                            struct pci_pbm_info *pbm)
{
        struct pci_bus_region region;
        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->flags = IORESOURCE_IO;
        region.start = (first << 21);
        region.end = (last << 21) + ((1 << 21) - 1);
        pcibios_bus_to_resource(dev->bus, res, &region);

        pci_read_config_byte(dev, APB_MEM_ADDRESS_MAP, &map);
        apb_calc_first_last(map, &first, &last);
        res = bus->resource[1];
        res->flags = IORESOURCE_MEM;
        region.start = (first << 29);
        region.end = (last << 29) + ((1 << 29) - 1);
        pcibios_bus_to_resource(dev->bus, res, &region);
}

static void 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 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 pci_bus_region region;
        struct resource *res;
        unsigned int flags;
        u64 size;

        if (ofpci_verbose)
                pci_info(dev, "of_scan_pci_bridge(%pOF)\n", node);

        /* parse bus-range property */
        busrange = of_get_property(node, "bus-range", &len);
        if (busrange == NULL || len != 8) {
                pci_info(dev, "Can't get bus-range for PCI-PCI bridge %pOF\n",
                       node);
                return;
        }

        if (ofpci_verbose)
                pci_info(dev, "    Bridge bus range [%u --> %u]\n",
                         busrange[0], busrange[1]);

        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) {
                pci_err(dev, "Failed to create pci bus for %pOF\n",
                        node);
                return;
        }

        bus->primary = dev->bus->number;
        pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
        bus->bridge_ctl = 0;

        if (ofpci_verbose)
                pci_info(dev, "    Bridge ranges[%p] simba[%d]\n",
                         ranges, simba);

        /* 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_read_bridge_bases(bus);
                goto after_ranges;
        }
        i = 1;
        for (; len >= 32; len -= 32, ranges += 8) {
                u64 start;

                if (ofpci_verbose)
                        pci_info(dev, "    RAW Range[%08x:%08x:%08x:%08x:%08x:%08x:"
                                 "%08x:%08x]\n",
                                 ranges[0], ranges[1], ranges[2], ranges[3],
                                 ranges[4], ranges[5], ranges[6], ranges[7]);

                flags = pci_parse_of_flags(ranges[0]);
                size = GET_64BIT(ranges, 6);
                if (flags == 0 || size == 0)
                        continue;

                /* On PCI-Express systems, PCI bridges that have no devices downstream
                 * have a bogus size value where the first 32-bit cell is 0xffffffff.
                 * This results in a bogus range where start + size overflows.
                 *
                 * Just skip these otherwise the kernel will complain when the resource
                 * tries to be claimed.
                 */
                if (size >> 32 == 0xffffffff)
                        continue;

                if (flags & IORESOURCE_IO) {
                        res = bus->resource[0];
                        if (res->flags) {
                                pci_err(dev, "ignoring extra I/O range"
                                        " for bridge %pOF\n", node);
                                continue;
                        }
                } else {
                        if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
                                pci_err(dev, "too many memory ranges"
                                        " for bridge %pOF\n", node);
                                continue;
                        }
                        res = bus->resource[i];
                        ++i;
                }

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

                if (ofpci_verbose)
                        pci_info(dev, "      Using flags[%08x] start[%016llx] size[%016llx]\n",
                                 flags, start, size);

                pcibios_bus_to_resource(dev->bus, res, &region);
        }
after_ranges:
        sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
                bus->number);
        if (ofpci_verbose)
                pci_info(dev, "    bus name: %s\n", bus->name);

        pci_of_scan_bus(pbm, node, bus);
}

static void 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)
                pci_info(bus, "scan_bus[%pOF] bus no %d\n",
                         node, bus->number);

        child = NULL;
        prev_devfn = -1;
        while ((child = of_get_next_child(node, child)) != NULL) {
                if (ofpci_verbose)
                        pci_info(bus, "  * %pOF\n", child);
                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)
                        pci_info(dev, "dev header type: %x\n", dev->hdr_type);

                if (pci_is_bridge(dev))
                        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.of_node;

        return snprintf (buf, PAGE_SIZE, "%pOF\n", dp);
}

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

static void 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);
                (void) err;
        }
        list_for_each_entry(child_bus, &bus->children, node)
                pci_bus_register_of_sysfs(child_bus);
}

static void pci_claim_legacy_resources(struct pci_dev *dev)
{
        struct pci_bus_region region;
        struct resource *p, *root, *conflict;

        if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
                return;

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

        p->name = "Video RAM area";
        p->flags = IORESOURCE_MEM | IORESOURCE_BUSY;

        region.start = 0xa0000UL;
        region.end = region.start + 0x1ffffUL;
        pcibios_bus_to_resource(dev->bus, p, &region);

        root = pci_find_parent_resource(dev, p);
        if (!root) {
                pci_info(dev, "can't claim VGA legacy %pR: no compatible bridge window\n", p);
                goto err;
        }

        conflict = request_resource_conflict(root, p);
        if (conflict) {
                pci_info(dev, "can't claim VGA legacy %pR: address conflict with %s %pR\n",
                         p, conflict->name, conflict);
                goto err;
        }

        pci_info(dev, "VGA legacy framebuffer %pR\n", p);
        return;

err:
        kfree(p);
}

static void pci_claim_bus_resources(struct pci_bus *bus)
{
        struct pci_bus *child_bus;
        struct pci_dev *dev;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                int i;

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

                        if (r->parent || !r->start || !r->flags)
                                continue;

                        if (ofpci_verbose)
                                pci_info(dev, "Claiming Resource %d: %pR\n",
                                         i, r);

                        pci_claim_resource(dev, i);
                }

                pci_claim_legacy_resources(dev);
        }

        list_for_each_entry(child_bus, &bus->children, node)
                pci_claim_bus_resources(child_bus);
}

struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
                                 struct device *parent)
{
        LIST_HEAD(resources);
        struct device_node *node = pbm->op->dev.of_node;
        struct pci_bus *bus;

        printk("PCI: Scanning PBM %pOF\n", node);

        pci_add_resource_offset(&resources, &pbm->io_space,
                                pbm->io_offset);
        pci_add_resource_offset(&resources, &pbm->mem_space,
                                pbm->mem_offset);
        if (pbm->mem64_space.flags)
                pci_add_resource_offset(&resources, &pbm->mem64_space,
                                        pbm->mem64_offset);
        pbm->busn.start = pbm->pci_first_busno;
        pbm->busn.end   = pbm->pci_last_busno;
        pbm->busn.flags = IORESOURCE_BUS;
        pci_add_resource(&resources, &pbm->busn);
        bus = pci_create_root_bus(parent, pbm->pci_first_busno, pbm->pci_ops,
                                  pbm, &resources);
        if (!bus) {
                printk(KERN_ERR "Failed to create bus for %pOF\n", node);
                pci_free_resource_list(&resources);
                return NULL;
        }

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

        pci_claim_bus_resources(bus);

        pci_bus_add_devices(bus);
        return bus;
}

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) {
                pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd);
                pci_write_config_word(dev, PCI_COMMAND, cmd);
        }
        return 0;
}

/* 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 = resource_size(&pbm->io_space);
        } else {
                space_size = resource_size(&pbm->mem_space);
        }

        /* 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];
                resource_size_t aligned_end;

                /* 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;
                }

                /* Align the resource end to the next page address.
                 * PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1),
                 * because actually we need the address of the next byte
                 * after rp->end.
                 */
                aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK;

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

        if (i > PCI_ROM_RESOURCE)
                return -EINVAL;

        return 0;
}

/* 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, int bar,
                        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_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;
}

#ifdef CONFIG_NUMA
int pcibus_to_node(struct pci_bus *pbus)
{
        struct pci_pbm_info *pbm = pbus->sysdata;

        return pbm->numa_node;
}
EXPORT_SYMBOL(pcibus_to_node);
#endif

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

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

        if (!pbm) {
                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;
        unsigned int irq;

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

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

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

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

/* ALI sound chips generate 31-bits of DMA, a special register
 * determines what bit 31 is emitted as.
 */
int ali_sound_dma_hack(struct device *dev, u64 device_mask)
{
        struct iommu *iommu = dev->archdata.iommu;
        struct pci_dev *ali_isa_bridge;
        u8 val;

        if (!dev_is_pci(dev))
                return 0;

        if (to_pci_dev(dev)->vendor != PCI_VENDOR_ID_AL ||
            to_pci_dev(dev)->device != PCI_DEVICE_ID_AL_M5451 ||
            device_mask != 0x7fffffff)
                return 0;

        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 (iommu->dma_addr_mask & 0x80000000)
                val |= 0x01;
        else
                val &= ~0x01;
        pci_write_config_byte(ali_isa_bridge, 0x7e, val);
        pci_dev_put(ali_isa_bridge);
        return 1;
}

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_bus_region region;

        /*
         * "User" addresses are shown in /sys/devices/pci.../.../resource
         * and /proc/bus/pci/devices and used as mmap offsets for
         * /proc/bus/pci/BB/DD.F files (see proc_bus_pci_mmap()).
         *

         * On sparc, these are PCI bus addresses, i.e., raw BAR values.
         */
        pcibios_resource_to_bus(pdev->bus, &region, (struct resource *) rp);
        *start = region.start;
        *end = region.end;
}

void pcibios_set_master(struct pci_dev *dev)
{
        /* No special bus mastering setup handling */
}

#ifdef CONFIG_PCI_IOV
int pcibios_add_device(struct pci_dev *dev)
{
        struct pci_dev *pdev;

        /* Add sriov arch specific initialization here.
         * Copy dev_archdata from PF to VF
         */
        if (dev->is_virtfn) {
                struct dev_archdata *psd;

                pdev = dev->physfn;
                psd = &pdev->dev.archdata;
                pci_init_dev_archdata(&dev->dev.archdata, psd->iommu,
                                      psd->stc, psd->host_controller, NULL,
                                      psd->numa_node);
        }
        return 0;
}
#endif /* CONFIG_PCI_IOV */

static int __init pcibios_init(void)
{
        pci_dfl_cache_line_size = 64 >> 2;
        return 0;
}
subsys_initcall(pcibios_init);

#ifdef CONFIG_SYSFS

#define SLOT_NAME_SIZE  11  /* Max decimal digits + null in u32 */

static void pcie_bus_slot_names(struct pci_bus *pbus)
{
        struct pci_dev *pdev;
        struct pci_bus *bus;

        list_for_each_entry(pdev, &pbus->devices, bus_list) {
                char name[SLOT_NAME_SIZE];
                struct pci_slot *pci_slot;
                const u32 *slot_num;
                int len;

                slot_num = of_get_property(pdev->dev.of_node,
                                           "physical-slot#", &len);

                if (slot_num == NULL || len != 4)
                        continue;

                snprintf(name, sizeof(name), "%u", slot_num[0]);
                pci_slot = pci_create_slot(pbus, slot_num[0], name, NULL);

                if (IS_ERR(pci_slot))
                        pr_err("PCI: pci_create_slot returned %ld.\n",
                               PTR_ERR(pci_slot));
        }

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

static void pci_bus_slot_names(struct device_node *node, struct pci_bus *bus)
{
        const struct pci_slot_names {
                u32     slot_mask;
                char    names[0];
        } *prop;
        const char *sp;
        int len, i;
        u32 mask;

        prop = of_get_property(node, "slot-names", &len);
        if (!prop)
                return;

        mask = prop->slot_mask;
        sp = prop->names;

        if (ofpci_verbose)
                pci_info(bus, "Making slots for [%pOF] mask[0x%02x]\n",
                         node, mask);

        i = 0;
        while (mask) {
                struct pci_slot *pci_slot;
                u32 this_bit = 1 << i;

                if (!(mask & this_bit)) {
                        i++;
                        continue;
                }

                if (ofpci_verbose)
                        pci_info(bus, "Making slot [%s]\n", sp);

                pci_slot = pci_create_slot(bus, i, sp, NULL);
                if (IS_ERR(pci_slot))
                        pci_err(bus, "pci_create_slot returned %ld\n",
                                PTR_ERR(pci_slot));

                sp += strlen(sp) + 1;
                mask &= ~this_bit;
                i++;
        }
}

static int __init of_pci_slot_init(void)
{
        struct pci_bus *pbus = NULL;

        while ((pbus = pci_find_next_bus(pbus)) != NULL) {
                struct device_node *node;
                struct pci_dev *pdev;

                pdev = list_first_entry(&pbus->devices, struct pci_dev,
                                        bus_list);

                if (pdev && pci_is_pcie(pdev)) {
                        pcie_bus_slot_names(pbus);
                } else {

                        if (pbus->self) {

                                /* PCI->PCI bridge */
                                node = pbus->self->dev.of_node;

                        } else {
                                struct pci_pbm_info *pbm = pbus->sysdata;

                                /* Host PCI controller */
                                node = pbm->op->dev.of_node;
                        }

                        pci_bus_slot_names(node, pbus);
                }
        }

        return 0;
}
device_initcall(of_pci_slot_init);
#endif