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/*

 * QEMU PowerPC E500 embedded processors pci controller emulation

 *

 * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved.

 *

 * Author: Yu Liu,     <yu.liu@freescale.com>

 *

 * This file is derived from hw/ppc4xx_pci.c,

 * the copyright for that material belongs to the original owners.

 *

 * This is free software; you can redistribute it and/or modify

 * it under the terms of  the GNU General  Public License as published by

 * the Free Software Foundation;  either version 2 of the  License, or

 * (at your option) any later version.

 */

#include "hw.h"

#include "ppc.h"

#include "ppce500.h"

#include "pci.h"

#include "pci_host.h"

#include "bswap.h"

#include "qemu-log.h"

#ifdef DEBUG_PCI

#define pci_debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)

#else

#define pci_debug(fmt, ...)

#endif

#define PCIE500_CFGADDR       0x0

#define PCIE500_CFGDATA       0x4

#define PCIE500_REG_BASE      0xC00

#define PCIE500_REG_SIZE      (0x1000 - PCIE500_REG_BASE)

#define PPCE500_PCI_CONFIG_ADDR         0x0

#define PPCE500_PCI_CONFIG_DATA         0x4

#define PPCE500_PCI_INTACK              0x8

#define PPCE500_PCI_OW1                 (0xC20 - PCIE500_REG_BASE)

#define PPCE500_PCI_OW2                 (0xC40 - PCIE500_REG_BASE)

#define PPCE500_PCI_OW3                 (0xC60 - PCIE500_REG_BASE)

#define PPCE500_PCI_OW4                 (0xC80 - PCIE500_REG_BASE)

#define PPCE500_PCI_IW3                 (0xDA0 - PCIE500_REG_BASE)

#define PPCE500_PCI_IW2                 (0xDC0 - PCIE500_REG_BASE)

#define PPCE500_PCI_IW1                 (0xDE0 - PCIE500_REG_BASE)

#define PPCE500_PCI_GASKET_TIMR         (0xE20 - PCIE500_REG_BASE)

#define PCI_POTAR               0x0

#define PCI_POTEAR              0x4

#define PCI_POWBAR              0x8

#define PCI_POWAR               0x10

#define PCI_PITAR               0x0

#define PCI_PIWBAR              0x8

#define PCI_PIWBEAR             0xC

#define PCI_PIWAR               0x10

#define PPCE500_PCI_NR_POBS     5

#define PPCE500_PCI_NR_PIBS     3

struct  pci_outbound {

    uint32_t potar;

    uint32_t potear;

    uint32_t powbar;

    uint32_t powar;

};

struct pci_inbound {

    uint32_t pitar;

    uint32_t piwbar;

    uint32_t piwbear;

    uint32_t piwar;

};

struct PPCE500PCIState {

    struct pci_outbound pob[PPCE500_PCI_NR_POBS];

    struct pci_inbound pib[PPCE500_PCI_NR_PIBS];

    uint32_t gasket_time;

    PCIHostState pci_state;

    PCIDevice *pci_dev;

};

typedef struct PPCE500PCIState PPCE500PCIState;

static uint32_t pci_reg_read4(void *opaque, target_phys_addr_t addr)

{

    PPCE500PCIState *pci = opaque;

    unsigned long win;

    uint32_t value = 0;

    win = addr & 0xfe0;

    switch (win) {

    case PPCE500_PCI_OW1:

    case PPCE500_PCI_OW2:

    case PPCE500_PCI_OW3:

    case PPCE500_PCI_OW4:

        switch (addr & 0xC) {

        case PCI_POTAR: value = pci->pob[(addr >> 5) & 0x7].potar; break;

        case PCI_POTEAR: value = pci->pob[(addr >> 5) & 0x7].potear; break;

        case PCI_POWBAR: value = pci->pob[(addr >> 5) & 0x7].powbar; break;

        case PCI_POWAR: value = pci->pob[(addr >> 5) & 0x7].powar; break;

        default: break;

        }

        break;

    case PPCE500_PCI_IW3:

    case PPCE500_PCI_IW2:

    case PPCE500_PCI_IW1:

        switch (addr & 0xC) {

        case PCI_PITAR: value = pci->pib[(addr >> 5) & 0x3].pitar; break;

        case PCI_PIWBAR: value = pci->pib[(addr >> 5) & 0x3].piwbar; break;

        case PCI_PIWBEAR: value = pci->pib[(addr >> 5) & 0x3].piwbear; break;

        case PCI_PIWAR: value = pci->pib[(addr >> 5) & 0x3].piwar; break;

        default: break;

        };

        break;

    case PPCE500_PCI_GASKET_TIMR:

        value = pci->gasket_time;

        break;

    default:

        break;

    }

    pci_debug("%s: win:%lx(addr:" TARGET_FMT_plx ") -> value:%x\n", __func__,

              win, addr, value);

    return value;

}

static CPUReadMemoryFunc * const e500_pci_reg_read[] = {

    &pci_reg_read4,

    &pci_reg_read4,

    &pci_reg_read4,

};

static void pci_reg_write4(void *opaque, target_phys_addr_t addr,

                               uint32_t value)

{

    PPCE500PCIState *pci = opaque;

    unsigned long win;

    win = addr & 0xfe0;

    pci_debug("%s: value:%x -> win:%lx(addr:" TARGET_FMT_plx ")\n",

              __func__, value, win, addr);

    switch (win) {

    case PPCE500_PCI_OW1:

    case PPCE500_PCI_OW2:

    case PPCE500_PCI_OW3:

    case PPCE500_PCI_OW4:

        switch (addr & 0xC) {

        case PCI_POTAR: pci->pob[(addr >> 5) & 0x7].potar = value; break;

        case PCI_POTEAR: pci->pob[(addr >> 5) & 0x7].potear = value; break;

        case PCI_POWBAR: pci->pob[(addr >> 5) & 0x7].powbar = value; break;

        case PCI_POWAR: pci->pob[(addr >> 5) & 0x7].powar = value; break;

        default: break;

        };

        break;

    case PPCE500_PCI_IW3:

    case PPCE500_PCI_IW2:

    case PPCE500_PCI_IW1:

        switch (addr & 0xC) {

        case PCI_PITAR: pci->pib[(addr >> 5) & 0x3].pitar = value; break;

        case PCI_PIWBAR: pci->pib[(addr >> 5) & 0x3].piwbar = value; break;

        case PCI_PIWBEAR: pci->pib[(addr >> 5) & 0x3].piwbear = value; break;

        case PCI_PIWAR: pci->pib[(addr >> 5) & 0x3].piwar = value; break;

        default: break;

        };

        break;

    case PPCE500_PCI_GASKET_TIMR:

        pci->gasket_time = value;

        break;

    default:

        break;

    };

}

static CPUWriteMemoryFunc * const e500_pci_reg_write[] = {

    &pci_reg_write4,

    &pci_reg_write4,

    &pci_reg_write4,

};

static int mpc85xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)

{

    int devno = pci_dev->devfn >> 3, ret = 0;

    switch (devno) {

        /* Two PCI slot */

        case 0x11:

        case 0x12:

            ret = (irq_num + devno - 0x10) % 4;

            break;

        default:

            printf("Error:%s:unknow dev number\n", __func__);

    }

    pci_debug("%s: devfn %x irq %d -> %d  devno:%x\n", __func__,

           pci_dev->devfn, irq_num, ret, devno);

    return ret;

}

static void mpc85xx_pci_set_irq(void *opaque, int irq_num, int level)

{

    qemu_irq *pic = opaque;

    pci_debug("%s: PCI irq %d, level:%d\n", __func__, irq_num, level);

    qemu_set_irq(pic[irq_num], level);

}

static void ppce500_pci_save(QEMUFile *f, void *opaque)

{

    PPCE500PCIState *controller = opaque;

    int i;

    pci_device_save(controller->pci_dev, f);

    for (i = 0; i < PPCE500_PCI_NR_POBS; i++) {

        qemu_put_be32s(f, &controller->pob[i].potar);

        qemu_put_be32s(f, &controller->pob[i].potear);

        qemu_put_be32s(f, &controller->pob[i].powbar);

        qemu_put_be32s(f, &controller->pob[i].powar);

    }

    for (i = 0; i < PPCE500_PCI_NR_PIBS; i++) {

        qemu_put_be32s(f, &controller->pib[i].pitar);

        qemu_put_be32s(f, &controller->pib[i].piwbar);

        qemu_put_be32s(f, &controller->pib[i].piwbear);

        qemu_put_be32s(f, &controller->pib[i].piwar);

    }

    qemu_put_be32s(f, &controller->gasket_time);

}

static int ppce500_pci_load(QEMUFile *f, void *opaque, int version_id)

{

    PPCE500PCIState *controller = opaque;

    int i;

    if (version_id != 1)

        return -EINVAL;

    pci_device_load(controller->pci_dev, f);

    for (i = 0; i < PPCE500_PCI_NR_POBS; i++) {

        qemu_get_be32s(f, &controller->pob[i].potar);

        qemu_get_be32s(f, &controller->pob[i].potear);

        qemu_get_be32s(f, &controller->pob[i].powbar);

        qemu_get_be32s(f, &controller->pob[i].powar);

    }

    for (i = 0; i < PPCE500_PCI_NR_PIBS; i++) {

        qemu_get_be32s(f, &controller->pib[i].pitar);

        qemu_get_be32s(f, &controller->pib[i].piwbar);

        qemu_get_be32s(f, &controller->pib[i].piwbear);

        qemu_get_be32s(f, &controller->pib[i].piwar);

    }

    qemu_get_be32s(f, &controller->gasket_time);

    return 0;

}

PCIBus *ppce500_pci_init(qemu_irq pci_irqs[4], target_phys_addr_t registers)

{

    PPCE500PCIState *controller;

    PCIDevice *d;

    int index;

    static int ppce500_pci_id;

    controller = qemu_mallocz(sizeof(PPCE500PCIState));

    controller->pci_state.bus = pci_register_bus(NULL, "pci",

                                                 mpc85xx_pci_set_irq,

                                                 mpc85xx_pci_map_irq,

                                                 pci_irqs, 0x88, 4);

    d = pci_register_device(controller->pci_state.bus,

                            "host bridge", sizeof(PCIDevice),

                            0, NULL, NULL);

    pci_config_set_vendor_id(d->config, PCI_VENDOR_ID_FREESCALE);

    pci_config_set_device_id(d->config, PCI_DEVICE_ID_MPC8533E);

    pci_config_set_class(d->config, PCI_CLASS_PROCESSOR_POWERPC);

    controller->pci_dev = d;

    /* CFGADDR */

    index = pci_host_config_register_io_memory_noswap(&controller->pci_state);

    if (index < 0)

        goto free;

    cpu_register_physical_memory(registers + PCIE500_CFGADDR, 4, index);

    /* CFGDATA */

    index = pci_host_data_register_io_memory(&controller->pci_state);

    if (index < 0)

        goto free;

    cpu_register_physical_memory(registers + PCIE500_CFGDATA, 4, index);

    index = cpu_register_io_memory(e500_pci_reg_read,

                                   e500_pci_reg_write, controller);

    if (index < 0)

        goto free;

    cpu_register_physical_memory(registers + PCIE500_REG_BASE,

                                   PCIE500_REG_SIZE, index);

    /* XXX load/save code not tested. */

    register_savevm("ppce500_pci", ppce500_pci_id++, 1,

                    ppce500_pci_save, ppce500_pci_load, controller);

    return controller->pci_state.bus;

free:

    printf("%s error\n", __func__);

    qemu_free(controller);

    return NULL;

}