/*
 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Andreas Heppel <aheppel@sysgo.de>
 *
 * (C) Copyright 2002, 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/*
 * PCI routines
 */

#include <common.h>

#include <command.h>
#include <errno.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <pci.h>

DECLARE_GLOBAL_DATA_PTR;

#define PCI_HOSE_OP(rw, size, type)                                     \
int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
                                  pci_dev_t dev,                        \
                                  int offset, type value)               \
{                                                                       \
        return hose->rw##_##size(hose, dev, offset, value);             \
}

PCI_HOSE_OP(read, byte, u8 *)
PCI_HOSE_OP(read, word, u16 *)
PCI_HOSE_OP(read, dword, u32 *)
PCI_HOSE_OP(write, byte, u8)
PCI_HOSE_OP(write, word, u16)
PCI_HOSE_OP(write, dword, u32)

#define PCI_OP(rw, size, type, error_code)                              \
int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
{                                                                       \
        struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
                                                                        \
        if (!hose)                                                      \
        {                                                               \
                error_code;                                             \
                return -1;                                              \
        }                                                               \
                                                                        \
        return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
}

PCI_OP(read, byte, u8 *, *value = 0xff)
PCI_OP(read, word, u16 *, *value = 0xffff)
PCI_OP(read, dword, u32 *, *value = 0xffffffff)
PCI_OP(write, byte, u8, )
PCI_OP(write, word, u16, )
PCI_OP(write, dword, u32, )

#define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
                                        pci_dev_t dev,                  \
                                        int offset, type val)           \
{                                                                       \
        u32 val32;                                                      \
                                                                        \
        if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0) { \
                *val = -1;                                              \
                return -1;                                              \
        }                                                               \
                                                                        \
        *val = (val32 >> ((offset & (int)off_mask) * 8));               \
                                                                        \
        return 0;                                                       \
}

#define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
                                             pci_dev_t dev,             \
                                             int offset, type val)      \
{                                                                       \
        u32 val32, mask, ldata, shift;                                  \
                                                                        \
        if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
                return -1;                                              \
                                                                        \
        shift = ((offset & (int)off_mask) * 8);                         \
        ldata = (((unsigned long)val) & val_mask) << shift;             \
        mask = val_mask << shift;                                       \
        val32 = (val32 & ~mask) | ldata;                                \
                                                                        \
        if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
                return -1;                                              \
                                                                        \
        return 0;                                                       \
}

PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)

/*
 *
 */

static struct pci_controller* hose_head;

struct pci_controller *pci_get_hose_head(void)
{
        if (gd->hose)
                return gd->hose;

        return hose_head;
}

void pci_register_hose(struct pci_controller* hose)
{
        struct pci_controller **phose = &hose_head;

        while(*phose)
                phose = &(*phose)->next;

        hose->next = NULL;

        *phose = hose;
}

struct pci_controller *pci_bus_to_hose(int bus)
{
        struct pci_controller *hose;

        for (hose = pci_get_hose_head(); hose; hose = hose->next) {
                if (bus >= hose->first_busno && bus <= hose->last_busno)
                        return hose;
        }

        printf("pci_bus_to_hose() failed\n");
        return NULL;
}

struct pci_controller *find_hose_by_cfg_addr(void *cfg_addr)
{
        struct pci_controller *hose;

        for (hose = pci_get_hose_head(); hose; hose = hose->next) {
                if (hose->cfg_addr == cfg_addr)
                        return hose;
        }

        return NULL;
}

int pci_last_busno(void)
{
        struct pci_controller *hose = pci_get_hose_head();

        if (!hose)
                return -1;

        while (hose->next)
                hose = hose->next;

        return hose->last_busno;
}

pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
{
        struct pci_controller * hose;
        pci_dev_t bdf;
        int bus;

        for (hose = pci_get_hose_head(); hose; hose = hose->next) {
#ifdef CONFIG_SYS_SCSI_SCAN_BUS_REVERSE
                for (bus = hose->last_busno; bus >= hose->first_busno; bus--) {
#else
                for (bus = hose->first_busno; bus <= hose->last_busno; bus++) {
#endif
                        bdf = pci_hose_find_devices(hose, bus, ids, &index);
                        if (bdf != -1)
                                return bdf;
                }
        }

        return -1;
}

int pci_hose_config_device(struct pci_controller *hose,
                           pci_dev_t dev,
                           unsigned long io,
                           pci_addr_t mem,
                           unsigned long command)
{
        u32 bar_response;
        unsigned int old_command;
        pci_addr_t bar_value;
        pci_size_t bar_size;
        unsigned char pin;
        int bar, found_mem64;

        debug("PCI Config: I/O=0x%lx, Memory=0x%llx, Command=0x%lx\n", io,
                (u64)mem, command);

        pci_hose_write_config_dword(hose, dev, PCI_COMMAND, 0);

        for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
                pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
                pci_hose_read_config_dword(hose, dev, bar, &bar_response);

                if (!bar_response)
                        continue;

                found_mem64 = 0;

                /* Check the BAR type and set our address mask */
                if (bar_response & PCI_BASE_ADDRESS_SPACE) {
                        bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
                        /* round up region base address to a multiple of size */
                        io = ((io - 1) | (bar_size - 1)) + 1;
                        bar_value = io;
                        /* compute new region base address */
                        io = io + bar_size;
                } else {
                        if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
                                PCI_BASE_ADDRESS_MEM_TYPE_64) {
                                u32 bar_response_upper;
                                u64 bar64;
                                pci_hose_write_config_dword(hose, dev, bar + 4,
                                        0xffffffff);
                                pci_hose_read_config_dword(hose, dev, bar + 4,
                                        &bar_response_upper);

                                bar64 = ((u64)bar_response_upper << 32) | bar_response;

                                bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
                                found_mem64 = 1;
                        } else {
                                bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
                        }

                        /* round up region base address to multiple of size */
                        mem = ((mem - 1) | (bar_size - 1)) + 1;
                        bar_value = mem;
                        /* compute new region base address */
                        mem = mem + bar_size;
                }

                /* Write it out and update our limit */
                pci_hose_write_config_dword (hose, dev, bar, (u32)bar_value);

                if (found_mem64) {
                        bar += 4;
#ifdef CONFIG_SYS_PCI_64BIT
                        pci_hose_write_config_dword(hose, dev, bar,
                                (u32)(bar_value >> 32));
#else
                        pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
#endif
                }
        }

        /* Configure Cache Line Size Register */
        pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);

        /* Configure Latency Timer */
        pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);

        /* Disable interrupt line, if device says it wants to use interrupts */
        pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_PIN, &pin);
        if (pin != 0) {
                pci_hose_write_config_byte(hose, dev, PCI_INTERRUPT_LINE,
                                           PCI_INTERRUPT_LINE_DISABLE);
        }

        pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &old_command);
        pci_hose_write_config_dword(hose, dev, PCI_COMMAND,
                                     (old_command & 0xffff0000) | command);

        return 0;
}

/*
 *
 */

struct pci_config_table *pci_find_config(struct pci_controller *hose,
                                         unsigned short class,
                                         unsigned int vendor,
                                         unsigned int device,
                                         unsigned int bus,
                                         unsigned int dev,
                                         unsigned int func)
{
        struct pci_config_table *table;

        for (table = hose->config_table; table && table->vendor; table++) {
                if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
                    (table->device == PCI_ANY_ID || table->device == device) &&
                    (table->class  == PCI_ANY_ID || table->class  == class)  &&
                    (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
                    (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
                    (table->func   == PCI_ANY_ID || table->func   == func)) {
                        return table;
                }
        }

        return NULL;
}

void pci_cfgfunc_config_device(struct pci_controller *hose,
                               pci_dev_t dev,
                               struct pci_config_table *entry)
{
        pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1],
                entry->priv[2]);
}

void pci_cfgfunc_do_nothing(struct pci_controller *hose,
                            pci_dev_t dev, struct pci_config_table *entry)
{
}

/*
 * HJF: Changed this to return int. I think this is required
 * to get the correct result when scanning bridges
 */
extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);

#ifdef CONFIG_PCI_SCAN_SHOW
__weak int pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
{
        if (dev == PCI_BDF(hose->first_busno, 0, 0))
                return 0;

        return 1;
}
#endif /* CONFIG_PCI_SCAN_SHOW */

int pci_hose_scan_bus(struct pci_controller *hose, int bus)
{
        unsigned int sub_bus, found_multi = 0;
        unsigned short vendor, device, class;
        unsigned char header_type;
#ifndef CONFIG_PCI_PNP
        struct pci_config_table *cfg;
#endif
        pci_dev_t dev;
#ifdef CONFIG_PCI_SCAN_SHOW
        static int indent = 0;
#endif

        sub_bus = bus;

        for (dev =  PCI_BDF(bus,0,0);
             dev <  PCI_BDF(bus, PCI_MAX_PCI_DEVICES - 1,
                                PCI_MAX_PCI_FUNCTIONS - 1);
             dev += PCI_BDF(0, 0, 1)) {

                if (pci_skip_dev(hose, dev))
                        continue;

                if (PCI_FUNC(dev) && !found_multi)
                        continue;

                pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);

                pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);

                if (vendor == 0xffff || vendor == 0x0000)
                        continue;

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

                debug("PCI Scan: Found Bus %d, Device %d, Function %d\n",
                        PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));

                pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
                pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);

#ifdef CONFIG_PCI_FIXUP_DEV
                board_pci_fixup_dev(hose, dev, vendor, device, class);
#endif

#ifdef CONFIG_PCI_SCAN_SHOW
                indent++;

                /* Print leading space, including bus indentation */
                printf("%*c", indent + 1, ' ');

                if (pci_print_dev(hose, dev)) {
                        printf("%02x:%02x.%-*x - %04x:%04x - %s\n",
                               PCI_BUS(dev), PCI_DEV(dev), 6 - indent, PCI_FUNC(dev),
                               vendor, device, pci_class_str(class >> 8));
                }
#endif

#ifdef CONFIG_PCI_PNP
                sub_bus = max((unsigned int)pciauto_config_device(hose, dev),
                              sub_bus);
#else
                cfg = pci_find_config(hose, class, vendor, device,
                                      PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
                if (cfg) {
                        cfg->config_device(hose, dev, cfg);
                        sub_bus = max(sub_bus,
                                      (unsigned int)hose->current_busno);
                }
#endif

#ifdef CONFIG_PCI_SCAN_SHOW
                indent--;
#endif

                if (hose->fixup_irq)
                        hose->fixup_irq(hose, dev);
        }

        return sub_bus;
}

int pci_hose_scan(struct pci_controller *hose)
{
#if defined(CONFIG_PCI_BOOTDELAY)
        char *s;
        int i;

        if (!gd->pcidelay_done) {
                /* wait "pcidelay" ms (if defined)... */
                s = getenv("pcidelay");
                if (s) {
                        int val = simple_strtoul(s, NULL, 10);
                        for (i = 0; i < val; i++)
                                udelay(1000);
                }
                gd->pcidelay_done = 1;
        }
#endif /* CONFIG_PCI_BOOTDELAY */

#ifdef CONFIG_PCI_SCAN_SHOW
        puts("PCI:\n");
#endif

        /*
         * Start scan at current_busno.
         * PCIe will start scan at first_busno+1.
         */
        /* For legacy support, ensure current >= first */
        if (hose->first_busno > hose->current_busno)
                hose->current_busno = hose->first_busno;
#ifdef CONFIG_PCI_PNP
        pciauto_config_init(hose);
#endif
        return pci_hose_scan_bus(hose, hose->current_busno);
}

void pci_init(void)
{
        hose_head = NULL;

        /* now call board specific pci_init()... */
        pci_init_board();
}

/* Returns the address of the requested capability structure within the
 * device's PCI configuration space or 0 in case the device does not
 * support it.
 * */
int pci_hose_find_capability(struct pci_controller *hose, pci_dev_t dev,
                             int cap)
{
        int pos;
        u8 hdr_type;

        pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &hdr_type);

        pos = pci_hose_find_cap_start(hose, dev, hdr_type & 0x7F);

        if (pos)
                pos = pci_find_cap(hose, dev, pos, cap);

        return pos;
}

/* Find the header pointer to the Capabilities*/
int pci_hose_find_cap_start(struct pci_controller *hose, pci_dev_t dev,
                            u8 hdr_type)
{
        u16 status;

        pci_hose_read_config_word(hose, dev, PCI_STATUS, &status);

        if (!(status & PCI_STATUS_CAP_LIST))
                return 0;

        switch (hdr_type) {
        case PCI_HEADER_TYPE_NORMAL:
        case PCI_HEADER_TYPE_BRIDGE:
                return PCI_CAPABILITY_LIST;
        case PCI_HEADER_TYPE_CARDBUS:
                return PCI_CB_CAPABILITY_LIST;
        default:
                return 0;
        }
}

int pci_find_cap(struct pci_controller *hose, pci_dev_t dev, int pos, int cap)
{
        int ttl = PCI_FIND_CAP_TTL;
        u8 id;
        u8 next_pos;

        while (ttl--) {
                pci_hose_read_config_byte(hose, dev, pos, &next_pos);
                if (next_pos < CAP_START_POS)
                        break;
                next_pos &= ~3;
                pos = (int) next_pos;
                pci_hose_read_config_byte(hose, dev,
                                          pos + PCI_CAP_LIST_ID, &id);
                if (id == 0xff)
                        break;
                if (id == cap)
                        return pos;
                pos += PCI_CAP_LIST_NEXT;
        }
        return 0;
}

/**
 * pci_find_next_ext_capability - Find an extended capability
 *
 * Returns the address of the next matching extended capability structure
 * within the device's PCI configuration space or 0 if the device does
 * not support it.  Some capabilities can occur several times, e.g., the
 * vendor-specific capability, and this provides a way to find them all.
 */
int pci_find_next_ext_capability(struct pci_controller *hose, pci_dev_t dev,
                                 int start, int cap)
{
        u32 header;
        int ttl, 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;

        pci_hose_read_config_dword(hose, dev, pos, &header);
        if (header == 0xffffffff || header == 0)
                return 0;

        while (ttl-- > 0) {
                if (PCI_EXT_CAP_ID(header) == cap && pos != start)
                        return pos;

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

                pci_hose_read_config_dword(hose, dev, pos, &header);
                if (header == 0xffffffff || header == 0)
                        break;
        }

        return 0;
}

/**
 * pci_hose_find_ext_capability - Find an extended capability
 *
 * Returns the address of the requested extended capability structure
 * within the device's PCI configuration space or 0 if the device does
 * not support it.
 */
int pci_hose_find_ext_capability(struct pci_controller *hose, pci_dev_t dev,
                                 int cap)
{
        return pci_find_next_ext_capability(hose, dev, 0, cap);
}