// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2014 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#define LOG_CATEGORY UCLASS_PCI

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <init.h>
#include <log.h>
#include <malloc.h>
#include <pci.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
#if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
#include <asm/fsp/fsp_support.h>
#endif
#include <dt-bindings/pci/pci.h>
#include <linux/delay.h>
#include "pci_internal.h"

DECLARE_GLOBAL_DATA_PTR;

int pci_get_bus(int busnum, struct udevice **busp)
{
        int ret;

        ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);

        /* Since buses may not be numbered yet try a little harder with bus 0 */
        if (ret == -ENODEV) {
                ret = uclass_first_device_err(UCLASS_PCI, busp);
                if (ret)
                        return ret;
                ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
        }

        return ret;
}

struct udevice *pci_get_controller(struct udevice *dev)
{
        while (device_is_on_pci_bus(dev))
                dev = dev->parent;

        return dev;
}

pci_dev_t dm_pci_get_bdf(const struct udevice *dev)
{
        struct pci_child_plat *pplat = dev_get_parent_plat(dev);
        struct udevice *bus = dev->parent;

        /*
         * This error indicates that @dev is a device on an unprobed PCI bus.
         * The bus likely has bus=seq == -1, so the PCI_ADD_BUS() macro below
         * will produce a bad BDF>
         *
         * A common cause of this problem is that this function is called in the
         * of_to_plat() method of @dev. Accessing the PCI bus in that
         * method is not allowed, since it has not yet been probed. To fix this,
         * move that access to the probe() method of @dev instead.
         */
        if (!device_active(bus))
                log_err("PCI: Device '%s' on unprobed bus '%s'\n", dev->name,
                        bus->name);
        return PCI_ADD_BUS(dev_seq(bus), pplat->devfn);
}

/**
 * pci_get_bus_max() - returns the bus number of the last active bus
 *
 * @return last bus number, or -1 if no active buses
 */
static int pci_get_bus_max(void)
{
        struct udevice *bus;
        struct uclass *uc;
        int ret = -1;

        ret = uclass_get(UCLASS_PCI, &uc);
        uclass_foreach_dev(bus, uc) {
                if (dev_seq(bus) > ret)
                        ret = dev_seq(bus);
        }

        debug("%s: ret=%d\n", __func__, ret);

        return ret;
}

int pci_last_busno(void)
{
        return pci_get_bus_max();
}

int pci_get_ff(enum pci_size_t size)
{
        switch (size) {
        case PCI_SIZE_8:
                return 0xff;
        case PCI_SIZE_16:
                return 0xffff;
        default:
                return 0xffffffff;
        }
}

static void pci_dev_find_ofnode(struct udevice *bus, phys_addr_t bdf,
                                ofnode *rnode)
{
        struct fdt_pci_addr addr;
        ofnode node;
        int ret;

        dev_for_each_subnode(node, bus) {
                ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg",
                                           &addr);
                if (ret)
                        continue;

                if (PCI_MASK_BUS(addr.phys_hi) != PCI_MASK_BUS(bdf))
                        continue;

                *rnode = node;
                break;
        }
};

int pci_bus_find_devfn(const struct udevice *bus, pci_dev_t find_devfn,
                       struct udevice **devp)
{
        struct udevice *dev;

        for (device_find_first_child(bus, &dev);
             dev;
             device_find_next_child(&dev)) {
                struct pci_child_plat *pplat;

                pplat = dev_get_parent_plat(dev);
                if (pplat && pplat->devfn == find_devfn) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int dm_pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
{
        struct udevice *bus;
        int ret;

        ret = pci_get_bus(PCI_BUS(bdf), &bus);
        if (ret)
                return ret;
        return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
}

static int pci_device_matches_ids(struct udevice *dev,
                                  const struct pci_device_id *ids)
{
        struct pci_child_plat *pplat;
        int i;

        pplat = dev_get_parent_plat(dev);
        if (!pplat)
                return -EINVAL;
        for (i = 0; ids[i].vendor != 0; i++) {
                if (pplat->vendor == ids[i].vendor &&
                    pplat->device == ids[i].device)
                        return i;
        }

        return -EINVAL;
}

int pci_bus_find_devices(struct udevice *bus, const struct pci_device_id *ids,
                         int *indexp, struct udevice **devp)
{
        struct udevice *dev;

        /* Scan all devices on this bus */
        for (device_find_first_child(bus, &dev);
             dev;
             device_find_next_child(&dev)) {
                if (pci_device_matches_ids(dev, ids) >= 0) {
                        if ((*indexp)-- <= 0) {
                                *devp = dev;
                                return 0;
                        }
                }
        }

        return -ENODEV;
}

int pci_find_device_id(const struct pci_device_id *ids, int index,
                       struct udevice **devp)
{
        struct udevice *bus;

        /* Scan all known buses */
        for (uclass_first_device(UCLASS_PCI, &bus);
             bus;
             uclass_next_device(&bus)) {
                if (!pci_bus_find_devices(bus, ids, &index, devp))
                        return 0;
        }
        *devp = NULL;

        return -ENODEV;
}

static int dm_pci_bus_find_device(struct udevice *bus, unsigned int vendor,
                                  unsigned int device, int *indexp,
                                  struct udevice **devp)
{
        struct pci_child_plat *pplat;
        struct udevice *dev;

        for (device_find_first_child(bus, &dev);
             dev;
             device_find_next_child(&dev)) {
                pplat = dev_get_parent_plat(dev);
                if (pplat->vendor == vendor && pplat->device == device) {
                        if (!(*indexp)--) {
                                *devp = dev;
                                return 0;
                        }
                }
        }

        return -ENODEV;
}

int dm_pci_find_device(unsigned int vendor, unsigned int device, int index,
                       struct udevice **devp)
{
        struct udevice *bus;

        /* Scan all known buses */
        for (uclass_first_device(UCLASS_PCI, &bus);
             bus;
             uclass_next_device(&bus)) {
                if (!dm_pci_bus_find_device(bus, vendor, device, &index, devp))
                        return device_probe(*devp);
        }
        *devp = NULL;

        return -ENODEV;
}

int dm_pci_find_class(uint find_class, int index, struct udevice **devp)
{
        struct udevice *dev;

        /* Scan all known buses */
        for (pci_find_first_device(&dev);
             dev;
             pci_find_next_device(&dev)) {
                struct pci_child_plat *pplat = dev_get_parent_plat(dev);

                if (pplat->class == find_class && !index--) {
                        *devp = dev;
                        return device_probe(*devp);
                }
        }
        *devp = NULL;

        return -ENODEV;
}

int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
                         unsigned long value, enum pci_size_t size)
{
        struct dm_pci_ops *ops;

        ops = pci_get_ops(bus);
        if (!ops->write_config)
                return -ENOSYS;
        return ops->write_config(bus, bdf, offset, value, size);
}

int pci_bus_clrset_config32(struct udevice *bus, pci_dev_t bdf, int offset,
                            u32 clr, u32 set)
{
        ulong val;
        int ret;

        ret = pci_bus_read_config(bus, bdf, offset, &val, PCI_SIZE_32);
        if (ret)
                return ret;
        val &= ~clr;
        val |= set;

        return pci_bus_write_config(bus, bdf, offset, val, PCI_SIZE_32);
}

static int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
                            enum pci_size_t size)
{
        struct udevice *bus;
        int ret;

        ret = pci_get_bus(PCI_BUS(bdf), &bus);
        if (ret)
                return ret;

        return pci_bus_write_config(bus, bdf, offset, value, size);
}

int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
                        enum pci_size_t size)
{
        struct udevice *bus;

        for (bus = dev; device_is_on_pci_bus(bus);)
                bus = bus->parent;
        return pci_bus_write_config(bus, dm_pci_get_bdf(dev), offset, value,
                                    size);
}

int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
{
        return pci_write_config(bdf, offset, value, PCI_SIZE_32);
}

int pci_write_config16(pci_dev_t bdf, int offset, u16 value)
{
        return pci_write_config(bdf, offset, value, PCI_SIZE_16);
}

int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
{
        return pci_write_config(bdf, offset, value, PCI_SIZE_8);
}

int dm_pci_write_config8(struct udevice *dev, int offset, u8 value)
{
        return dm_pci_write_config(dev, offset, value, PCI_SIZE_8);
}

int dm_pci_write_config16(struct udevice *dev, int offset, u16 value)
{
        return dm_pci_write_config(dev, offset, value, PCI_SIZE_16);
}

int dm_pci_write_config32(struct udevice *dev, int offset, u32 value)
{
        return dm_pci_write_config(dev, offset, value, PCI_SIZE_32);
}

int pci_bus_read_config(const struct udevice *bus, pci_dev_t bdf, int offset,
                        unsigned long *valuep, enum pci_size_t size)
{
        struct dm_pci_ops *ops;

        ops = pci_get_ops(bus);
        if (!ops->read_config)
                return -ENOSYS;
        return ops->read_config(bus, bdf, offset, valuep, size);
}

static int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
                           enum pci_size_t size)
{
        struct udevice *bus;
        int ret;

        ret = pci_get_bus(PCI_BUS(bdf), &bus);
        if (ret)
                return ret;

        return pci_bus_read_config(bus, bdf, offset, valuep, size);
}

int dm_pci_read_config(const struct udevice *dev, int offset,
                       unsigned long *valuep, enum pci_size_t size)
{
        const struct udevice *bus;

        for (bus = dev; device_is_on_pci_bus(bus);)
                bus = bus->parent;
        return pci_bus_read_config(bus, dm_pci_get_bdf(dev), offset, valuep,
                                   size);
}

int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
{
        unsigned long value;
        int ret;

        ret = pci_read_config(bdf, offset, &value, PCI_SIZE_32);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int pci_read_config16(pci_dev_t bdf, int offset, u16 *valuep)
{
        unsigned long value;
        int ret;

        ret = pci_read_config(bdf, offset, &value, PCI_SIZE_16);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
{
        unsigned long value;
        int ret;

        ret = pci_read_config(bdf, offset, &value, PCI_SIZE_8);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int dm_pci_read_config8(const struct udevice *dev, int offset, u8 *valuep)
{
        unsigned long value;
        int ret;

        ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_8);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int dm_pci_read_config16(const struct udevice *dev, int offset, u16 *valuep)
{
        unsigned long value;
        int ret;

        ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_16);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int dm_pci_read_config32(const struct udevice *dev, int offset, u32 *valuep)
{
        unsigned long value;
        int ret;

        ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_32);
        if (ret)
                return ret;
        *valuep = value;

        return 0;
}

int dm_pci_clrset_config8(struct udevice *dev, int offset, u32 clr, u32 set)
{
        u8 val;
        int ret;

        ret = dm_pci_read_config8(dev, offset, &val);
        if (ret)
                return ret;
        val &= ~clr;
        val |= set;

        return dm_pci_write_config8(dev, offset, val);
}

int dm_pci_clrset_config16(struct udevice *dev, int offset, u32 clr, u32 set)
{
        u16 val;
        int ret;

        ret = dm_pci_read_config16(dev, offset, &val);
        if (ret)
                return ret;
        val &= ~clr;
        val |= set;

        return dm_pci_write_config16(dev, offset, val);
}

int dm_pci_clrset_config32(struct udevice *dev, int offset, u32 clr, u32 set)
{
        u32 val;
        int ret;

        ret = dm_pci_read_config32(dev, offset, &val);
        if (ret)
                return ret;
        val &= ~clr;
        val |= set;

        return dm_pci_write_config32(dev, offset, val);
}

static void set_vga_bridge_bits(struct udevice *dev)
{
        struct udevice *parent = dev->parent;
        u16 bc;

        while (dev_seq(parent) != 0) {
                dm_pci_read_config16(parent, PCI_BRIDGE_CONTROL, &bc);
                bc |= PCI_BRIDGE_CTL_VGA;
                dm_pci_write_config16(parent, PCI_BRIDGE_CONTROL, bc);
                parent = parent->parent;
        }
}

int pci_auto_config_devices(struct udevice *bus)
{
        struct pci_controller *hose = dev_get_uclass_priv(bus);
        struct pci_child_plat *pplat;
        unsigned int sub_bus;
        struct udevice *dev;
        int ret;

        sub_bus = dev_seq(bus);
        debug("%s: start\n", __func__);
        pciauto_config_init(hose);
        for (ret = device_find_first_child(bus, &dev);
             !ret && dev;
             ret = device_find_next_child(&dev)) {
                unsigned int max_bus;
                int ret;

                debug("%s: device %s\n", __func__, dev->name);
                if (dev_has_ofnode(dev) &&
                    dev_read_bool(dev, "pci,no-autoconfig"))
                        continue;
                ret = dm_pciauto_config_device(dev);
                if (ret < 0)
                        return log_msg_ret("auto", ret);
                max_bus = ret;
                sub_bus = max(sub_bus, max_bus);

                if (dev_get_parent(dev) == bus)
                        continue;

                pplat = dev_get_parent_plat(dev);
                if (pplat->class == (PCI_CLASS_DISPLAY_VGA << 8))
                        set_vga_bridge_bits(dev);
        }
        debug("%s: done\n", __func__);

        return log_msg_ret("sub", sub_bus);
}

int pci_generic_mmap_write_config(
        const struct udevice *bus,
        int (*addr_f)(const struct udevice *bus, pci_dev_t bdf, uint offset,
                      void **addrp),
        pci_dev_t bdf,
        uint offset,
        ulong value,
        enum pci_size_t size)
{
        void *address;

        if (addr_f(bus, bdf, offset, &address) < 0)
                return 0;

        switch (size) {
        case PCI_SIZE_8:
                writeb(value, address);
                return 0;
        case PCI_SIZE_16:
                writew(value, address);
                return 0;
        case PCI_SIZE_32:
                writel(value, address);
                return 0;
        default:
                return -EINVAL;
        }
}

int pci_generic_mmap_read_config(
        const struct udevice *bus,
        int (*addr_f)(const struct udevice *bus, pci_dev_t bdf, uint offset,
                      void **addrp),
        pci_dev_t bdf,
        uint offset,
        ulong *valuep,
        enum pci_size_t size)
{
        void *address;

        if (addr_f(bus, bdf, offset, &address) < 0) {
                *valuep = pci_get_ff(size);
                return 0;
        }

        switch (size) {
        case PCI_SIZE_8:
                *valuep = readb(address);
                return 0;
        case PCI_SIZE_16:
                *valuep = readw(address);
                return 0;
        case PCI_SIZE_32:
                *valuep = readl(address);
                return 0;
        default:
                return -EINVAL;
        }
}

int dm_pci_hose_probe_bus(struct udevice *bus)
{
        u8 header_type;
        int sub_bus;
        int ret;
        int ea_pos;
        u8 reg;

        debug("%s\n", __func__);

        dm_pci_read_config8(bus, PCI_HEADER_TYPE, &header_type);
        header_type &= 0x7f;
        if (header_type != PCI_HEADER_TYPE_BRIDGE) {
                debug("%s: Skipping PCI device %d with Non-Bridge Header Type 0x%x\n",
                      __func__, PCI_DEV(dm_pci_get_bdf(bus)), header_type);
                return log_msg_ret("probe", -EINVAL);
        }

        ea_pos = dm_pci_find_capability(bus, PCI_CAP_ID_EA);
        if (ea_pos) {
                dm_pci_read_config8(bus, ea_pos + sizeof(u32) + sizeof(u8),
                                    &reg);
                sub_bus = reg;
        } else {
                sub_bus = pci_get_bus_max() + 1;
        }
        debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
        dm_pciauto_prescan_setup_bridge(bus, sub_bus);

        ret = device_probe(bus);
        if (ret) {
                debug("%s: Cannot probe bus %s: %d\n", __func__, bus->name,
                      ret);
                return log_msg_ret("probe", ret);
        }

        if (!ea_pos)
                sub_bus = pci_get_bus_max();

        dm_pciauto_postscan_setup_bridge(bus, sub_bus);

        return sub_bus;
}

/**
 * pci_match_one_device - Tell if a PCI device structure has a matching
 *                        PCI device id structure
 * @id: single PCI device id structure to match
 * @find: the PCI device id structure to match against
 *
 * Returns true if the finding pci_device_id structure matched or false if
 * there is no match.
 */
static bool pci_match_one_id(const struct pci_device_id *id,
                             const struct pci_device_id *find)
{
        if ((id->vendor == PCI_ANY_ID || id->vendor == find->vendor) &&
            (id->device == PCI_ANY_ID || id->device == find->device) &&
            (id->subvendor == PCI_ANY_ID || id->subvendor == find->subvendor) &&
            (id->subdevice == PCI_ANY_ID || id->subdevice == find->subdevice) &&
            !((id->class ^ find->class) & id->class_mask))
                return true;

        return false;
}

/**
 * pci_need_device_pre_reloc() - Check if a device should be bound
 *
 * This checks a list of vendor/device-ID values indicating devices that should
 * be bound before relocation.
 *
 * @bus: Bus to check
 * @vendor: Vendor ID to check
 * @device: Device ID to check
 * @return true if the vendor/device is in the list, false if not
 */
static bool pci_need_device_pre_reloc(struct udevice *bus, uint vendor,
                                      uint device)
{
        u32 vendev;
        int index;

        for (index = 0;
             !dev_read_u32_index(bus, "u-boot,pci-pre-reloc", index,
                                 &vendev);
             index++) {
                if (vendev == PCI_VENDEV(vendor, device))
                        return true;
        }

        return false;
}

/**
 * pci_find_and_bind_driver() - Find and bind the right PCI driver
 *
 * This only looks at certain fields in the descriptor.
 *
 * @parent:     Parent bus
 * @find_id:    Specification of the driver to find
 * @bdf:        Bus/device/function addreess - see PCI_BDF()
 * @devp:       Returns a pointer to the device created
 * @return 0 if OK, -EPERM if the device is not needed before relocation and
 *         therefore was not created, other -ve value on error
 */
static int pci_find_and_bind_driver(struct udevice *parent,
                                    struct pci_device_id *find_id,
                                    pci_dev_t bdf, struct udevice **devp)
{
        struct pci_driver_entry *start, *entry;
        ofnode node = ofnode_null();
        const char *drv;
        int n_ents;
        int ret;
        char name[30], *str;
        bool bridge;

        *devp = NULL;

        debug("%s: Searching for driver: vendor=%x, device=%x\n", __func__,
              find_id->vendor, find_id->device);

        /* Determine optional OF node */
        if (ofnode_valid(dev_ofnode(parent)))
                pci_dev_find_ofnode(parent, bdf, &node);

        if (ofnode_valid(node) && !ofnode_is_available(node)) {
                debug("%s: Ignoring disabled device\n", __func__);
                return log_msg_ret("dis", -EPERM);
        }

        start = ll_entry_start(struct pci_driver_entry, pci_driver_entry);
        n_ents = ll_entry_count(struct pci_driver_entry, pci_driver_entry);
        for (entry = start; entry != start + n_ents; entry++) {
                const struct pci_device_id *id;
                struct udevice *dev;
                const struct driver *drv;

                for (id = entry->match;
                     id->vendor || id->subvendor || id->class_mask;
                     id++) {
                        if (!pci_match_one_id(id, find_id))
                                continue;

                        drv = entry->driver;

                        /*
                         * In the pre-relocation phase, we only bind devices
                         * whose driver has the DM_FLAG_PRE_RELOC set, to save
                         * precious memory space as on some platforms as that
                         * space is pretty limited (ie: using Cache As RAM).
                         */
                        if (!(gd->flags & GD_FLG_RELOC) &&
                            !(drv->flags & DM_FLAG_PRE_RELOC))
                                return log_msg_ret("pre", -EPERM);

                        /*
                         * We could pass the descriptor to the driver as
                         * plat (instead of NULL) and allow its bind()
                         * method to return -ENOENT if it doesn't support this
                         * device. That way we could continue the search to
                         * find another driver. For now this doesn't seem
                         * necesssary, so just bind the first match.
                         */
                        ret = device_bind(parent, drv, drv->name, NULL, node,
                                          &dev);
                        if (ret)
                                goto error;
                        debug("%s: Match found: %s\n", __func__, drv->name);
                        dev->driver_data = id->driver_data;
                        *devp = dev;
                        return 0;
                }
        }

        bridge = (find_id->class >> 8) == PCI_CLASS_BRIDGE_PCI;
        /*
         * In the pre-relocation phase, we only bind bridge devices to save
         * precious memory space as on some platforms as that space is pretty
         * limited (ie: using Cache As RAM).
         */
        if (!(gd->flags & GD_FLG_RELOC) && !bridge &&
            !pci_need_device_pre_reloc(parent, find_id->vendor,
                                       find_id->device))
                return log_msg_ret("notbr", -EPERM);

        /* Bind a generic driver so that the device can be used */
        sprintf(name, "pci_%x:%x.%x", dev_seq(parent), PCI_DEV(bdf),
                PCI_FUNC(bdf));
        str = strdup(name);
        if (!str)
                return -ENOMEM;
        drv = bridge ? "pci_bridge_drv" : "pci_generic_drv";

        ret = device_bind_driver_to_node(parent, drv, str, node, devp);
        if (ret) {
                debug("%s: Failed to bind generic driver: %d\n", __func__, ret);
                free(str);
                return ret;
        }
        debug("%s: No match found: bound generic driver instead\n", __func__);

        return 0;

error:
        debug("%s: No match found: error %d\n", __func__, ret);
        return ret;
}

__weak extern void board_pci_fixup_dev(struct udevice *bus, struct udevice *dev)
{
}

int pci_bind_bus_devices(struct udevice *bus)
{
        ulong vendor, device;
        ulong header_type;
        pci_dev_t bdf, end;
        bool found_multi;
        int ari_off;
        int ret;

        found_multi = false;
        end = PCI_BDF(dev_seq(bus), PCI_MAX_PCI_DEVICES - 1,
                      PCI_MAX_PCI_FUNCTIONS - 1);
        for (bdf = PCI_BDF(dev_seq(bus), 0, 0); bdf <= end;
             bdf += PCI_BDF(0, 0, 1)) {
                struct pci_child_plat *pplat;
                struct udevice *dev;
                ulong class;

                if (!PCI_FUNC(bdf))
                        found_multi = false;
                if (PCI_FUNC(bdf) && !found_multi)
                        continue;

                /* Check only the first access, we don't expect problems */
                ret = pci_bus_read_config(bus, bdf, PCI_VENDOR_ID, &vendor,
                                          PCI_SIZE_16);
                if (ret || vendor == 0xffff || vendor == 0x0000)
                        continue;

                pci_bus_read_config(bus, bdf, PCI_HEADER_TYPE,
                                    &header_type, PCI_SIZE_8);

                if (!PCI_FUNC(bdf))
                        found_multi = header_type & 0x80;

                debug("%s: bus %d/%s: found device %x, function %d", __func__,
                      dev_seq(bus), bus->name, PCI_DEV(bdf), PCI_FUNC(bdf));
                pci_bus_read_config(bus, bdf, PCI_DEVICE_ID, &device,
                                    PCI_SIZE_16);
                pci_bus_read_config(bus, bdf, PCI_CLASS_REVISION, &class,
                                    PCI_SIZE_32);
                class >>= 8;

                /* Find this device in the device tree */
                ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), &dev);
                debug(": find ret=%d\n", ret);

                /* If nothing in the device tree, bind a device */
                if (ret == -ENODEV) {
                        struct pci_device_id find_id;
                        ulong val;

                        memset(&find_id, '\0', sizeof(find_id));
                        find_id.vendor = vendor;
                        find_id.device = device;
                        find_id.class = class;
                        if ((header_type & 0x7f) == PCI_HEADER_TYPE_NORMAL) {
                                pci_bus_read_config(bus, bdf,
                                                    PCI_SUBSYSTEM_VENDOR_ID,
                                                    &val, PCI_SIZE_32);
                                find_id.subvendor = val & 0xffff;
                                find_id.subdevice = val >> 16;
                        }
                        ret = pci_find_and_bind_driver(bus, &find_id, bdf,
                                                       &dev);
                }
                if (ret == -EPERM)
                        continue;
                else if (ret)
                        return ret;

                /* Update the platform data */
                pplat = dev_get_parent_plat(dev);
                pplat->devfn = PCI_MASK_BUS(bdf);
                pplat->vendor = vendor;
                pplat->device = device;
                pplat->class = class;

                if (IS_ENABLED(CONFIG_PCI_ARID)) {
                        ari_off = dm_pci_find_ext_capability(dev,
                                                             PCI_EXT_CAP_ID_ARI);
                        if (ari_off) {
                                u16 ari_cap;

                                /*
                                 * Read Next Function number in ARI Cap
                                 * Register
                                 */
                                dm_pci_read_config16(dev, ari_off + 4,
                                                     &ari_cap);
                                /*
                                 * Update next scan on this function number,
                                 * subtract 1 in BDF to satisfy loop increment.
                                 */
                                if (ari_cap & 0xff00) {
                                        bdf = PCI_BDF(PCI_BUS(bdf),
                                                      PCI_DEV(ari_cap),
                                                      PCI_FUNC(ari_cap));
                                        bdf = bdf - 0x100;
                                }
                        }
                }

                board_pci_fixup_dev(bus, dev);
        }

        return 0;
}

static void decode_regions(struct pci_controller *hose, ofnode parent_node,
                           ofnode node)
{
        int pci_addr_cells, addr_cells, size_cells;
        int cells_per_record;
        struct bd_info *bd;
        const u32 *prop;
        int max_regions;
        int len;
        int i;

        prop = ofnode_get_property(node, "ranges", &len);
        if (!prop) {
                debug("%s: Cannot decode regions\n", __func__);
                return;
        }

        pci_addr_cells = ofnode_read_simple_addr_cells(node);
        addr_cells = ofnode_read_simple_addr_cells(parent_node);
        size_cells = ofnode_read_simple_size_cells(node);

        /* PCI addresses are always 3-cells */
        len /= sizeof(u32);
        cells_per_record = pci_addr_cells + addr_cells + size_cells;
        hose->region_count = 0;
        debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
              cells_per_record);

        /* Dynamically allocate the regions array */
        max_regions = len / cells_per_record + CONFIG_NR_DRAM_BANKS;
        hose->regions = (struct pci_region *)
                calloc(1, max_regions * sizeof(struct pci_region));

        for (i = 0; i < max_regions; i++, len -= cells_per_record) {
                u64 pci_addr, addr, size;
                int space_code;
                u32 flags;
                int type;
                int pos;

                if (len < cells_per_record)
                        break;
                flags = fdt32_to_cpu(prop[0]);
                space_code = (flags >> 24) & 3;
                pci_addr = fdtdec_get_number(prop + 1, 2);
                prop += pci_addr_cells;
                addr = fdtdec_get_number(prop, addr_cells);
                prop += addr_cells;
                size = fdtdec_get_number(prop, size_cells);
                prop += size_cells;

                debug("%s: region %d, pci_addr=%llx, addr=%llx, size=%llx, space_code=%d\n",
                      __func__, hose->region_count, pci_addr, addr, size, space_code);
                if (space_code & 2) {
                        type = flags & (1U << 30) ? PCI_REGION_PREFETCH :
                                        PCI_REGION_MEM;
                } else if (space_code & 1) {
                        type = PCI_REGION_IO;
                } else {
                        continue;
                }

                if (!IS_ENABLED(CONFIG_SYS_PCI_64BIT) &&
                    type == PCI_REGION_MEM && upper_32_bits(pci_addr)) {
                        debug(" - beyond the 32-bit boundary, ignoring\n");
                        continue;
                }

                pos = -1;
                if (!IS_ENABLED(CONFIG_PCI_REGION_MULTI_ENTRY)) {
                        for (i = 0; i < hose->region_count; i++) {
                                if (hose->regions[i].flags == type)
                                        pos = i;
                        }
                }

                if (pos == -1)
                        pos = hose->region_count++;
                debug(" - type=%d, pos=%d\n", type, pos);
                pci_set_region(hose->regions + pos, pci_addr, addr, size, type);
        }

        /* Add a region for our local memory */
        bd = gd->bd;
        if (!bd)
                return;

        for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) {
                if (bd->bi_dram[i].size) {
                        phys_addr_t start = bd->bi_dram[i].start;

                        if (IS_ENABLED(CONFIG_PCI_MAP_SYSTEM_MEMORY))
                                start = virt_to_phys((void *)(uintptr_t)bd->bi_dram[i].start);

                        pci_set_region(hose->regions + hose->region_count++,
                                       start, start, bd->bi_dram[i].size,
                                       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
                }
        }

        return;
}

static int pci_uclass_pre_probe(struct udevice *bus)
{
        struct pci_controller *hose;
        struct uclass *uc;
        int ret;

        debug("%s, bus=%d/%s, parent=%s\n", __func__, dev_seq(bus), bus->name,
              bus->parent->name);
        hose = dev_get_uclass_priv(bus);

        /*
         * Set the sequence number, if device_bind() doesn't. We want control
         * of this so that numbers are allocated as devices are probed. That
         * ensures that sub-bus numbered is correct (sub-buses must get numbers
         * higher than their parents)
         */
        if (dev_seq(bus) == -1) {
                ret = uclass_get(UCLASS_PCI, &uc);
                if (ret)
                        return ret;
                bus->seq_ = uclass_find_next_free_seq(uc);
        }

        /* For bridges, use the top-level PCI controller */
        if (!device_is_on_pci_bus(bus)) {
                hose->ctlr = bus;
                decode_regions(hose, dev_ofnode(bus->parent), dev_ofnode(bus));
        } else {
                struct pci_controller *parent_hose;

                parent_hose = dev_get_uclass_priv(bus->parent);
                hose->ctlr = parent_hose->bus;
        }

        hose->bus = bus;
        hose->first_busno = dev_seq(bus);
        hose->last_busno = dev_seq(bus);
        if (dev_has_ofnode(bus)) {
                hose->skip_auto_config_until_reloc =
                        dev_read_bool(bus,
                                      "u-boot,skip-auto-config-until-reloc");
        }

        return 0;
}

static int pci_uclass_post_probe(struct udevice *bus)
{
        struct pci_controller *hose = dev_get_uclass_priv(bus);
        int ret;

        debug("%s: probing bus %d\n", __func__, dev_seq(bus));
        ret = pci_bind_bus_devices(bus);
        if (ret)
                return log_msg_ret("bind", ret);

        if (CONFIG_IS_ENABLED(PCI_PNP) && ll_boot_init() &&
            (!hose->skip_auto_config_until_reloc ||
             (gd->flags & GD_FLG_RELOC))) {
                ret = pci_auto_config_devices(bus);
                if (ret < 0)
                        return log_msg_ret("cfg", ret);
        }

#if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
        /*
         * Per Intel FSP specification, we should call FSP notify API to
         * inform FSP that PCI enumeration has been done so that FSP will
         * do any necessary initialization as required by the chipset's
         * BIOS Writer's Guide (BWG).
         *
         * Unfortunately we have to put this call here as with driver model,
         * the enumeration is all done on a lazy basis as needed, so until
         * something is touched on PCI it won't happen.
         *
         * Note we only call this 1) after U-Boot is relocated, and 2)
         * root bus has finished probing.
         */
        if ((gd->flags & GD_FLG_RELOC) && dev_seq(bus) == 0 && ll_boot_init()) {
                ret = fsp_init_phase_pci();
                if (ret)
                        return log_msg_ret("fsp", ret);
        }
#endif

        return 0;
}

static int pci_uclass_child_post_bind(struct udevice *dev)
{
        struct pci_child_plat *pplat;

        if (!dev_has_ofnode(dev))
                return 0;

        pplat = dev_get_parent_plat(dev);

        /* Extract vendor id and device id if available */
        ofnode_read_pci_vendev(dev_ofnode(dev), &pplat->vendor, &pplat->device);

        /* Extract the devfn from fdt_pci_addr */
        pplat->devfn = pci_get_devfn(dev);

        return 0;
}

static int pci_bridge_read_config(const struct udevice *bus, pci_dev_t bdf,
                                  uint offset, ulong *valuep,
                                  enum pci_size_t size)
{
        struct pci_controller *hose = dev_get_uclass_priv(bus);

        return pci_bus_read_config(hose->ctlr, bdf, offset, valuep, size);
}

static int pci_bridge_write_config(struct udevice *bus, pci_dev_t bdf,
                                   uint offset, ulong value,
                                   enum pci_size_t size)
{
        struct pci_controller *hose = dev_get_uclass_priv(bus);

        return pci_bus_write_config(hose->ctlr, bdf, offset, value, size);
}

static int skip_to_next_device(struct udevice *bus, struct udevice **devp)
{
        struct udevice *dev;
        int ret = 0;

        /*
         * Scan through all the PCI controllers. On x86 there will only be one
         * but that is not necessarily true on other hardware.
         */
        do {
                device_find_first_child(bus, &dev);
                if (dev) {
                        *devp = dev;
                        return 0;
                }
                ret = uclass_next_device(&bus);
                if (ret)
                        return ret;
        } while (bus);

        return 0;
}

int pci_find_next_device(struct udevice **devp)
{
        struct udevice *child = *devp;
        struct udevice *bus = child->parent;
        int ret;

        /* First try all the siblings */
        *devp = NULL;
        while (child) {
                device_find_next_child(&child);
                if (child) {
                        *devp = child;
                        return 0;
                }
        }

        /* We ran out of siblings. Try the next bus */
        ret = uclass_next_device(&bus);
        if (ret)
                return ret;

        return bus ? skip_to_next_device(bus, devp) : 0;
}

int pci_find_first_device(struct udevice **devp)
{
        struct udevice *bus;
        int ret;

        *devp = NULL;
        ret = uclass_first_device(UCLASS_PCI, &bus);
        if (ret)
                return ret;

        return skip_to_next_device(bus, devp);
}

ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size)
{
        switch (size) {
        case PCI_SIZE_8:
                return (value >> ((offset & 3) * 8)) & 0xff;
        case PCI_SIZE_16:
                return (value >> ((offset & 2) * 8)) & 0xffff;
        default:
                return value;
        }
}

ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
                          enum pci_size_t size)
{
        uint off_mask;
        uint val_mask, shift;
        ulong ldata, mask;

        switch (size) {
        case PCI_SIZE_8:
                off_mask = 3;
                val_mask = 0xff;
                break;
        case PCI_SIZE_16:
                off_mask = 2;
                val_mask = 0xffff;
                break;
        default:
                return value;
        }
        shift = (offset & off_mask) * 8;
        ldata = (value & val_mask) << shift;
        mask = val_mask << shift;
        value = (old & ~mask) | ldata;

        return value;
}

int pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index)
{
        int pci_addr_cells, addr_cells, size_cells;
        int cells_per_record;
        const u32 *prop;
        int len;
        int i = 0;

        prop = ofnode_get_property(dev_ofnode(dev), "dma-ranges", &len);
        if (!prop) {
                log_err("PCI: Device '%s': Cannot decode dma-ranges\n",
                        dev->name);
                return -EINVAL;
        }

        pci_addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev));
        addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev->parent));
        size_cells = ofnode_read_simple_size_cells(dev_ofnode(dev));

        /* PCI addresses are always 3-cells */
        len /= sizeof(u32);
        cells_per_record = pci_addr_cells + addr_cells + size_cells;
        debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
              cells_per_record);

        while (len) {
                memp->bus_start = fdtdec_get_number(prop + 1, 2);
                prop += pci_addr_cells;
                memp->phys_start = fdtdec_get_number(prop, addr_cells);
                prop += addr_cells;
                memp->size = fdtdec_get_number(prop, size_cells);
                prop += size_cells;

                if (i == index)
                        return 0;
                i++;
                len -= cells_per_record;
        }

        return -EINVAL;
}

int pci_get_regions(struct udevice *dev, struct pci_region **iop,
                    struct pci_region **memp, struct pci_region **prefp)
{
        struct udevice *bus = pci_get_controller(dev);
        struct pci_controller *hose = dev_get_uclass_priv(bus);
        int i;

        *iop = NULL;
        *memp = NULL;
        *prefp = NULL;
        for (i = 0; i < hose->region_count; i++) {
                switch (hose->regions[i].flags) {
                case PCI_REGION_IO:
                        if (!*iop || (*iop)->size < hose->regions[i].size)
                                *iop = hose->regions + i;
                        break;
                case PCI_REGION_MEM:
                        if (!*memp || (*memp)->size < hose->regions[i].size)
                                *memp = hose->regions + i;
                        break;
                case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
                        if (!*prefp || (*prefp)->size < hose->regions[i].size)
                                *prefp = hose->regions + i;
                        break;
                }
        }

        return (*iop != NULL) + (*memp != NULL) + (*prefp != NULL);
}

u32 dm_pci_read_bar32(const struct udevice *dev, int barnum)
{
        u32 addr;
        int bar;

        bar = PCI_BASE_ADDRESS_0 + barnum * 4;
        dm_pci_read_config32(dev, bar, &addr);

        /*
         * If we get an invalid address, return this so that comparisons with
         * FDT_ADDR_T_NONE work correctly
         */
        if (addr == 0xffffffff)
                return addr;
        else if (addr & PCI_BASE_ADDRESS_SPACE_IO)
                return addr & PCI_BASE_ADDRESS_IO_MASK;
        else
                return addr & PCI_BASE_ADDRESS_MEM_MASK;
}

void dm_pci_write_bar32(struct udevice *dev, int barnum, u32 addr)
{
        int bar;

        bar = PCI_BASE_ADDRESS_0 + barnum * 4;
        dm_pci_write_config32(dev, bar, addr);
}

static int _dm_pci_bus_to_phys(struct udevice *ctlr,
                               pci_addr_t bus_addr, unsigned long flags,
                               unsigned long skip_mask, phys_addr_t *pa)
{
        struct pci_controller *hose = dev_get_uclass_priv(ctlr);
        struct pci_region *res;
        int i;

        if (hose->region_count == 0) {
                *pa = bus_addr;
                return 0;
        }

        for (i = 0; i < hose->region_count; i++) {
                res = &hose->regions[i];

                if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
                        continue;

                if (res->flags & skip_mask)
                        continue;

                if (bus_addr >= res->bus_start &&
                    (bus_addr - res->bus_start) < res->size) {
                        *pa = (bus_addr - res->bus_start + res->phys_start);
                        return 0;
                }
        }

        return 1;
}

phys_addr_t dm_pci_bus_to_phys(struct udevice *dev, pci_addr_t bus_addr,
                               unsigned long flags)
{
        phys_addr_t phys_addr = 0;
        struct udevice *ctlr;
        int ret;

        /* The root controller has the region information */
        ctlr = pci_get_controller(dev);

        /*
         * if PCI_REGION_MEM is set we do a two pass search with preference
         * on matches that don't have PCI_REGION_SYS_MEMORY set
         */
        if ((flags & PCI_REGION_TYPE) == PCI_REGION_MEM) {
                ret = _dm_pci_bus_to_phys(ctlr, bus_addr,
                                          flags, PCI_REGION_SYS_MEMORY,
                                          &phys_addr);
                if (!ret)
                        return phys_addr;
        }

        ret = _dm_pci_bus_to_phys(ctlr, bus_addr, flags, 0, &phys_addr);

        if (ret)
                puts("pci_hose_bus_to_phys: invalid physical address\n");

        return phys_addr;
}

static int _dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
                               unsigned long flags, unsigned long skip_mask,
                               pci_addr_t *ba)
{
        struct pci_region *res;
        struct udevice *ctlr;
        pci_addr_t bus_addr;
        int i;
        struct pci_controller *hose;

        /* The root controller has the region information */
        ctlr = pci_get_controller(dev);
        hose = dev_get_uclass_priv(ctlr);

        if (hose->region_count == 0) {
                *ba = phys_addr;
                return 0;
        }

        for (i = 0; i < hose->region_count; i++) {
                res = &hose->regions[i];

                if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
                        continue;

                if (res->flags & skip_mask)
                        continue;

                bus_addr = phys_addr - res->phys_start + res->bus_start;

                if (bus_addr >= res->bus_start &&
                    (bus_addr - res->bus_start) < res->size) {
                        *ba = bus_addr;
                        return 0;
                }
        }

        return 1;
}

pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
                              unsigned long flags)
{
        pci_addr_t bus_addr = 0;
        int ret;

        /*
         * if PCI_REGION_MEM is set we do a two pass search with preference
         * on matches that don't have PCI_REGION_SYS_MEMORY set
         */
        if ((flags & PCI_REGION_TYPE) == PCI_REGION_MEM) {
                ret = _dm_pci_phys_to_bus(dev, phys_addr, flags,
                                          PCI_REGION_SYS_MEMORY, &bus_addr);
                if (!ret)
                        return bus_addr;
        }

        ret = _dm_pci_phys_to_bus(dev, phys_addr, flags, 0, &bus_addr);

        if (ret)
                puts("pci_hose_phys_to_bus: invalid physical address\n");

        return bus_addr;
}

static phys_addr_t dm_pci_map_ea_virt(struct udevice *dev, int ea_off,
                                      struct pci_child_plat *pdata)
{
        phys_addr_t addr = 0;

        /*
         * In the case of a Virtual Function device using BAR
         * base and size, add offset for VFn BAR(1, 2, 3...n)
         */
        if (pdata->is_virtfn) {
                size_t sz;
                u32 ea_entry;

                /* MaxOffset, 1st DW */
                dm_pci_read_config32(dev, ea_off + 8, &ea_entry);
                sz = ea_entry & PCI_EA_FIELD_MASK;
                /* Fill up lower 2 bits */
                sz |= (~PCI_EA_FIELD_MASK);

                if (ea_entry & PCI_EA_IS_64) {
                        /* MaxOffset 2nd DW */
                        dm_pci_read_config32(dev, ea_off + 16, &ea_entry);
                        sz |= ((u64)ea_entry) << 32;
                }

                addr = (pdata->virtid - 1) * (sz + 1);
        }

        return addr;
}

static void *dm_pci_map_ea_bar(struct udevice *dev, int bar, int flags,
                               int ea_off, struct pci_child_plat *pdata)
{
        int ea_cnt, i, entry_size;
        int bar_id = (bar - PCI_BASE_ADDRESS_0) >> 2;
        u32 ea_entry;
        phys_addr_t addr;

        if (IS_ENABLED(CONFIG_PCI_SRIOV)) {
                /*
                 * In the case of a Virtual Function device, device is
                 * Physical function, so pdata will point to required VF
                 * specific data.
                 */
                if (pdata->is_virtfn)
                        bar_id += PCI_EA_BEI_VF_BAR0;
        }

        /* EA capability structure header */
        dm_pci_read_config32(dev, ea_off, &ea_entry);
        ea_cnt = (ea_entry >> 16) & PCI_EA_NUM_ENT_MASK;
        ea_off += PCI_EA_FIRST_ENT;

        for (i = 0; i < ea_cnt; i++, ea_off += entry_size) {
                /* Entry header */
                dm_pci_read_config32(dev, ea_off, &ea_entry);
                entry_size = ((ea_entry & PCI_EA_ES) + 1) << 2;

                if (((ea_entry & PCI_EA_BEI) >> 4) != bar_id)
                        continue;

                /* Base address, 1st DW */
                dm_pci_read_config32(dev, ea_off + 4, &ea_entry);
                addr = ea_entry & PCI_EA_FIELD_MASK;
                if (ea_entry & PCI_EA_IS_64) {
                        /* Base address, 2nd DW, skip over 4B MaxOffset */
                        dm_pci_read_config32(dev, ea_off + 12, &ea_entry);
                        addr |= ((u64)ea_entry) << 32;
                }

                if (IS_ENABLED(CONFIG_PCI_SRIOV))
                        addr += dm_pci_map_ea_virt(dev, ea_off, pdata);

                /* size ignored for now */
                return map_physmem(addr, 0, flags);
        }

        return 0;
}

void *dm_pci_map_bar(struct udevice *dev, int bar, int flags)
{
        struct pci_child_plat *pdata = dev_get_parent_plat(dev);
        struct udevice *udev = dev;
        pci_addr_t pci_bus_addr;
        u32 bar_response;
        int ea_off;

        if (IS_ENABLED(CONFIG_PCI_SRIOV)) {
                /*
                 * In case of Virtual Function devices, use PF udevice
                 * as EA capability is defined in Physical Function
                 */
                if (pdata->is_virtfn)
                        udev = pdata->pfdev;
        }

        /*
         * if the function supports Enhanced Allocation use that instead of
         * BARs
         * Incase of virtual functions, pdata will help read VF BEI
         * and EA entry size.
         */
        ea_off = dm_pci_find_capability(udev, PCI_CAP_ID_EA);
        if (ea_off)
                return dm_pci_map_ea_bar(udev, bar, flags, ea_off, pdata);

        /* read BAR address */
        dm_pci_read_config32(udev, bar, &bar_response);
        pci_bus_addr = (pci_addr_t)(bar_response & ~0xf);

        /*
         * Pass "0" as the length argument to pci_bus_to_virt.  The arg
         * isn't actually used on any platform because U-Boot assumes a static
         * linear mapping.  In the future, this could read the BAR size
         * and pass that as the size if needed.
         */
        return dm_pci_bus_to_virt(udev, pci_bus_addr, flags, 0, MAP_NOCACHE);
}

static int _dm_pci_find_next_capability(struct udevice *dev, u8 pos, int cap)
{
        int ttl = PCI_FIND_CAP_TTL;
        u8 id;
        u16 ent;

        dm_pci_read_config8(dev, pos, &pos);

        while (ttl--) {
                if (pos < PCI_STD_HEADER_SIZEOF)
                        break;
                pos &= ~3;
                dm_pci_read_config16(dev, pos, &ent);

                id = ent & 0xff;
                if (id == 0xff)
                        break;
                if (id == cap)
                        return pos;
                pos = (ent >> 8);
        }

        return 0;
}

int dm_pci_find_next_capability(struct udevice *dev, u8 start, int cap)
{
        return _dm_pci_find_next_capability(dev, start + PCI_CAP_LIST_NEXT,
                                            cap);
}

int dm_pci_find_capability(struct udevice *dev, int cap)
{
        u16 status;
        u8 header_type;
        u8 pos;

        dm_pci_read_config16(dev, PCI_STATUS, &status);
        if (!(status & PCI_STATUS_CAP_LIST))
                return 0;

        dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type);
        if ((header_type & 0x7f) == PCI_HEADER_TYPE_CARDBUS)
                pos = PCI_CB_CAPABILITY_LIST;
        else
                pos = PCI_CAPABILITY_LIST;

        return _dm_pci_find_next_capability(dev, pos, cap);
}

int dm_pci_find_next_ext_capability(struct udevice *dev, int start, int cap)
{
        u32 header;
        int ttl;
        int pos = PCI_CFG_SPACE_SIZE;

        /* minimum 8 bytes per capability */
        ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;

        if (start)
                pos = start;

        dm_pci_read_config32(dev, pos, &header);
        /*
         * If we have no capabilities, this is indicated by cap ID,
         * cap version and next pointer all being 0.
         */
        if (header == 0)
                return 0;

        while (ttl--) {
                if (PCI_EXT_CAP_ID(header) == cap)
                        return pos;

                pos = PCI_EXT_CAP_NEXT(header);
                if (pos < PCI_CFG_SPACE_SIZE)
                        break;

                dm_pci_read_config32(dev, pos, &header);
        }

        return 0;
}

int dm_pci_find_ext_capability(struct udevice *dev, int cap)
{
        return dm_pci_find_next_ext_capability(dev, 0, cap);
}

int dm_pci_flr(struct udevice *dev)
{
        int pcie_off;
        u32 cap;

        /* look for PCI Express Capability */
        pcie_off = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
        if (!pcie_off)
                return -ENOENT;

        /* check FLR capability */
        dm_pci_read_config32(dev, pcie_off + PCI_EXP_DEVCAP, &cap);
        if (!(cap & PCI_EXP_DEVCAP_FLR))
                return -ENOENT;

        dm_pci_clrset_config16(dev, pcie_off + PCI_EXP_DEVCTL, 0,
                               PCI_EXP_DEVCTL_BCR_FLR);

        /* wait 100ms, per PCI spec */
        mdelay(100);

        return 0;
}

#if defined(CONFIG_PCI_SRIOV)
int pci_sriov_init(struct udevice *pdev, int vf_en)
{
        u16 vendor, device;
        struct udevice *bus;
        struct udevice *dev;
        pci_dev_t bdf;
        u16 ctrl;
        u16 num_vfs;
        u16 total_vf;
        u16 vf_offset;
        u16 vf_stride;
        int vf, ret;
        int pos;

        pos = dm_pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
        if (!pos) {
                debug("Error: SRIOV capability not found\n");
                return -ENOENT;
        }

        dm_pci_read_config16(pdev, pos + PCI_SRIOV_CTRL, &ctrl);

        dm_pci_read_config16(pdev, pos + PCI_SRIOV_TOTAL_VF, &total_vf);
        if (vf_en > total_vf)
                vf_en = total_vf;
        dm_pci_write_config16(pdev, pos + PCI_SRIOV_NUM_VF, vf_en);

        ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
        dm_pci_write_config16(pdev, pos + PCI_SRIOV_CTRL, ctrl);

        dm_pci_read_config16(pdev, pos + PCI_SRIOV_NUM_VF, &num_vfs);
        if (num_vfs > vf_en)
                num_vfs = vf_en;

        dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_OFFSET, &vf_offset);
        dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_STRIDE, &vf_stride);

        dm_pci_read_config16(pdev, PCI_VENDOR_ID, &vendor);
        dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_DID, &device);

        bdf = dm_pci_get_bdf(pdev);

        pci_get_bus(PCI_BUS(bdf), &bus);

        if (!bus)
                return -ENODEV;

        bdf += PCI_BDF(0, 0, vf_offset);

        for (vf = 0; vf < num_vfs; vf++) {
                struct pci_child_plat *pplat;
                ulong class;

                pci_bus_read_config(bus, bdf, PCI_CLASS_DEVICE,
                                    &class, PCI_SIZE_16);

                debug("%s: bus %d/%s: found VF %x:%x\n", __func__,
                      dev_seq(bus), bus->name, PCI_DEV(bdf), PCI_FUNC(bdf));

                /* Find this device in the device tree */
                ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), &dev);

                if (ret == -ENODEV) {
                        struct pci_device_id find_id;

                        memset(&find_id, '\0', sizeof(find_id));
                        find_id.vendor = vendor;
                        find_id.device = device;
                        find_id.class = class;

                        ret = pci_find_and_bind_driver(bus, &find_id,
                                                       bdf, &dev);

                        if (ret)
                                return ret;
                }

                /* Update the platform data */
                pplat = dev_get_parent_plat(dev);
                pplat->devfn = PCI_MASK_BUS(bdf);
                pplat->vendor = vendor;
                pplat->device = device;
                pplat->class = class;
                pplat->is_virtfn = true;
                pplat->pfdev = pdev;
                pplat->virtid = vf * vf_stride + vf_offset;

                debug("%s: bus %d/%s: found VF %x:%x %x:%x class %lx id %x\n",
                      __func__, dev_seq(dev), dev->name, PCI_DEV(bdf),
                      PCI_FUNC(bdf), vendor, device, class, pplat->virtid);
                bdf += PCI_BDF(0, 0, vf_stride);
        }

        return 0;
}

int pci_sriov_get_totalvfs(struct udevice *pdev)
{
        u16 total_vf;
        int pos;

        pos = dm_pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
        if (!pos) {
                debug("Error: SRIOV capability not found\n");
                return -ENOENT;
        }

        dm_pci_read_config16(pdev, pos + PCI_SRIOV_TOTAL_VF, &total_vf);

        return total_vf;
}
#endif /* SRIOV */

UCLASS_DRIVER(pci) = {
        .id             = UCLASS_PCI,
        .name           = "pci",
        .flags          = DM_UC_FLAG_SEQ_ALIAS | DM_UC_FLAG_NO_AUTO_SEQ,
        .post_bind      = dm_scan_fdt_dev,
        .pre_probe      = pci_uclass_pre_probe,
        .post_probe     = pci_uclass_post_probe,
        .child_post_bind = pci_uclass_child_post_bind,
        .per_device_auto        = sizeof(struct pci_controller),
        .per_child_plat_auto    = sizeof(struct pci_child_plat),
};

static const struct dm_pci_ops pci_bridge_ops = {
        .read_config    = pci_bridge_read_config,
        .write_config   = pci_bridge_write_config,
};

static const struct udevice_id pci_bridge_ids[] = {
        { .compatible = "pci-bridge" },
        { }
};

U_BOOT_DRIVER(pci_bridge_drv) = {
        .name           = "pci_bridge_drv",
        .id             = UCLASS_PCI,
        .of_match       = pci_bridge_ids,
        .ops            = &pci_bridge_ops,
};

UCLASS_DRIVER(pci_generic) = {
        .id             = UCLASS_PCI_GENERIC,
        .name           = "pci_generic",
};

static const struct udevice_id pci_generic_ids[] = {
        { .compatible = "pci-generic" },
        { }
};

U_BOOT_DRIVER(pci_generic_drv) = {
        .name           = "pci_generic_drv",
        .id             = UCLASS_PCI_GENERIC,
        .of_match       = pci_generic_ids,
};

int pci_init(void)
{
        struct udevice *bus;

        /*
         * Enumerate all known controller devices. Enumeration has the side-
         * effect of probing them, so PCIe devices will be enumerated too.
         */
        for (uclass_first_device_check(UCLASS_PCI, &bus);
             bus;
             uclass_next_device_check(&bus)) {
                ;
        }

        return 0;
}