/*
 * QEMU IDE Emulation: PCI VIA82C686B support.
 *
 * Copyright (c) 2003 Fabrice Bellard
 * Copyright (c) 2006 Openedhand Ltd.
 * Copyright (c) 2010 Huacai Chen <zltjiangshi@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "hw/pci/pci.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "qemu/range.h"
#include "sysemu/dma.h"
#include "hw/isa/vt82c686.h"
#include "hw/ide/pci.h"
#include "hw/irq.h"
#include "trace.h"

static uint64_t bmdma_read(void *opaque, hwaddr addr,
                           unsigned size)
{
    BMDMAState *bm = opaque;
    uint32_t val;

    if (size != 1) {
        return ((uint64_t)1 << (size * 8)) - 1;
    }

    switch (addr & 3) {
    case 0:
        val = bm->cmd;
        break;
    case 2:
        val = bm->status;
        break;
    default:
        val = 0xff;
        break;
    }

    trace_bmdma_read_via(addr, val);
    return val;
}

static void bmdma_write(void *opaque, hwaddr addr,
                        uint64_t val, unsigned size)
{
    BMDMAState *bm = opaque;

    if (size != 1) {
        return;
    }

    trace_bmdma_write_via(addr, val);
    switch (addr & 3) {
    case 0:
        bmdma_cmd_writeb(bm, val);
        break;
    case 2:
        bmdma_status_writeb(bm, val);
        break;
    default:;
    }
}

static const MemoryRegionOps via_bmdma_ops = {
    .read = bmdma_read,
    .write = bmdma_write,
};

static void bmdma_setup_bar(PCIIDEState *d)
{
    int i;

    memory_region_init(&d->bmdma_bar, OBJECT(d), "via-bmdma-container", 16);
    for (i = 0; i < ARRAY_SIZE(d->bmdma); i++) {
        BMDMAState *bm = &d->bmdma[i];

        memory_region_init_io(&bm->extra_io, OBJECT(d), &via_bmdma_ops, bm,
                              "via-bmdma", 4);
        memory_region_add_subregion(&d->bmdma_bar, i * 8, &bm->extra_io);
        memory_region_init_io(&bm->addr_ioport, OBJECT(d),
                              &bmdma_addr_ioport_ops, bm, "bmdma", 4);
        memory_region_add_subregion(&d->bmdma_bar, i * 8 + 4, &bm->addr_ioport);
    }
}

static void via_ide_set_irq(void *opaque, int n, int level)
{
    PCIIDEState *s = opaque;
    PCIDevice *d = PCI_DEVICE(s);

    if (level) {
        d->config[0x70 + n * 8] |= 0x80;
    } else {
        d->config[0x70 + n * 8] &= ~0x80;
    }

    qemu_set_irq(s->isa_irq[n], level);
}

static void via_ide_reset(DeviceState *dev)
{
    PCIIDEState *d = PCI_IDE(dev);
    PCIDevice *pd = PCI_DEVICE(dev);
    uint8_t *pci_conf = pd->config;
    int i;

    for (i = 0; i < ARRAY_SIZE(d->bus); i++) {
        ide_bus_reset(&d->bus[i]);
    }

    pci_config_set_prog_interface(pci_conf, 0x8a); /* legacy mode */
    pci_ide_update_mode(d);

    pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_WAIT);
    pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_FAST_BACK |
                 PCI_STATUS_DEVSEL_MEDIUM);

    pci_set_byte(pci_conf + PCI_INTERRUPT_LINE, 0xe);

    /* IDE chip enable, IDE configuration 1/2, IDE FIFO Configuration*/
    pci_set_long(pci_conf + 0x40, 0x0a090600);
    /* IDE misc configuration 1/2/3 */
    pci_set_long(pci_conf + 0x44, 0x00c00068);
    /* IDE Timing control */
    pci_set_long(pci_conf + 0x48, 0xa8a8a8a8);
    /* IDE Address Setup Time */
    pci_set_long(pci_conf + 0x4c, 0x000000ff);
    /* UltraDMA Extended Timing Control*/
    pci_set_long(pci_conf + 0x50, 0x07070707);
    /* UltraDMA FIFO Control */
    pci_set_long(pci_conf + 0x54, 0x00000004);
    /* IDE primary sector size */
    pci_set_long(pci_conf + 0x60, 0x00000200);
    /* IDE secondary sector size */
    pci_set_long(pci_conf + 0x68, 0x00000200);
    /* PCI PM Block */
    pci_set_long(pci_conf + 0xc0, 0x00020001);
}

static uint32_t via_ide_cfg_read(PCIDevice *pd, uint32_t addr, int len)
{
    uint32_t val = pci_default_read_config(pd, addr, len);
    uint8_t mode = pd->config[PCI_CLASS_PROG];

    if ((mode & 0xf) == 0xa) {
        if (ranges_overlap(addr, len, PCI_BASE_ADDRESS_0, 16)) {
            /* BARs 0-3 always read back zero in legacy mode */
            for (int i = addr; i < addr + len; i++) {
                if (i >= PCI_BASE_ADDRESS_0 && i < PCI_BASE_ADDRESS_0 + 16) {
                    val &= ~(0xffULL << ((i - addr) << 3));
                }
            }
        }
        if (addr == PCI_BASE_ADDRESS_4 && val == PCI_BASE_ADDRESS_SPACE_IO) {
            /* BAR4 default value if unset */
            val = 0xcc00 | PCI_BASE_ADDRESS_SPACE_IO;
        }
    }

    return val;
}

static void via_ide_cfg_write(PCIDevice *pd, uint32_t addr,
                              uint32_t val, int len)
{
    PCIIDEState *d = PCI_IDE(pd);

    pci_default_write_config(pd, addr, val, len);

    if (range_covers_byte(addr, len, PCI_CLASS_PROG)) {
        pci_ide_update_mode(d);
    }
}

static void via_ide_realize(PCIDevice *dev, Error **errp)
{
    PCIIDEState *d = PCI_IDE(dev);
    DeviceState *ds = DEVICE(dev);
    uint8_t *pci_conf = dev->config;
    int i;

    pci_set_long(pci_conf + PCI_CAPABILITY_LIST, 0x000000c0);
    dev->wmask[PCI_INTERRUPT_LINE] = 0;
    dev->wmask[PCI_CLASS_PROG] = 5;

    memory_region_init_io(&d->data_bar[0], OBJECT(d), &pci_ide_data_le_ops,
                          &d->bus[0], "via-ide0-data", 8);
    pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &d->data_bar[0]);

    memory_region_init_io(&d->cmd_bar[0], OBJECT(d), &pci_ide_cmd_le_ops,
                          &d->bus[0], "via-ide0-cmd", 4);
    pci_register_bar(dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->cmd_bar[0]);

    memory_region_init_io(&d->data_bar[1], OBJECT(d), &pci_ide_data_le_ops,
                          &d->bus[1], "via-ide1-data", 8);
    pci_register_bar(dev, 2, PCI_BASE_ADDRESS_SPACE_IO, &d->data_bar[1]);

    memory_region_init_io(&d->cmd_bar[1], OBJECT(d), &pci_ide_cmd_le_ops,
                          &d->bus[1], "via-ide1-cmd", 4);
    pci_register_bar(dev, 3, PCI_BASE_ADDRESS_SPACE_IO, &d->cmd_bar[1]);

    bmdma_setup_bar(d);
    pci_register_bar(dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &d->bmdma_bar);

    qdev_init_gpio_in(ds, via_ide_set_irq, ARRAY_SIZE(d->bus));
    for (i = 0; i < ARRAY_SIZE(d->bus); i++) {
        ide_bus_init(&d->bus[i], sizeof(d->bus[i]), ds, i, MAX_IDE_DEVS);
        ide_bus_init_output_irq(&d->bus[i], qdev_get_gpio_in(ds, i));

        bmdma_init(&d->bus[i], &d->bmdma[i], d);
        ide_bus_register_restart_cb(&d->bus[i]);
    }
}

static void via_ide_exitfn(PCIDevice *dev)
{
    PCIIDEState *d = PCI_IDE(dev);
    unsigned i;

    for (i = 0; i < ARRAY_SIZE(d->bmdma); ++i) {
        memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].extra_io);
        memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].addr_ioport);
    }
}

static void via_ide_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    dc->reset = via_ide_reset;
    dc->vmsd = &vmstate_ide_pci;
    /* Reason: only works as function of VIA southbridge */
    dc->user_creatable = false;

    k->config_read = via_ide_cfg_read;
    k->config_write = via_ide_cfg_write;
    k->realize = via_ide_realize;
    k->exit = via_ide_exitfn;
    k->vendor_id = PCI_VENDOR_ID_VIA;
    k->device_id = PCI_DEVICE_ID_VIA_IDE;
    k->revision = 0x06;
    k->class_id = PCI_CLASS_STORAGE_IDE;
    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
}

static const TypeInfo via_ide_info = {
    .name          = TYPE_VIA_IDE,
    .parent        = TYPE_PCI_IDE,
    .class_init    = via_ide_class_init,
};

static void via_ide_register_types(void)
{
    type_register_static(&via_ide_info);
}

type_init(via_ide_register_types)