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/*

 * QEMU Intel i82378 emulation (PCI to ISA bridge)

 *

 * Copyright (c) 2010-2011 Hervé Poussineau

 *

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

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw/pci/pci.h"

#include "hw/i386/pc.h"

#include "hw/timer/i8254.h"

#include "hw/audio/pcspk.h"

//#define DEBUG_I82378

#ifdef DEBUG_I82378

#define DPRINTF(fmt, ...) \

do { fprintf(stderr, "i82378: " fmt , ## __VA_ARGS__); } while (0)

#else

#define DPRINTF(fmt, ...) \

do {} while (0)

#endif

#define BADF(fmt, ...) \

do { fprintf(stderr, "i82378 ERROR: " fmt , ## __VA_ARGS__); } while (0)

typedef struct I82378State {

    qemu_irq out[2];

    qemu_irq *i8259;

    MemoryRegion io;

    MemoryRegion mem;

} I82378State;

typedef struct PCIi82378State {

    PCIDevice pci_dev;

    uint32_t isa_io_base;

    uint32_t isa_mem_base;

    I82378State state;

} PCIi82378State;

static const VMStateDescription vmstate_pci_i82378 = {

    .name = "pci-i82378",

    .version_id = 0,

    .minimum_version_id = 0,

    .fields = (VMStateField[]) {

        VMSTATE_PCI_DEVICE(pci_dev, PCIi82378State),

        VMSTATE_END_OF_LIST()

    },

};

static void i82378_io_write(void *opaque, hwaddr addr,

                            uint64_t value, unsigned int size)

{

    switch (size) {

    case 1:

        DPRINTF("%s: " TARGET_FMT_plx "=%02" PRIx64 "\n", __func__,

                addr, value);

        cpu_outb(addr, value);

        break;

    case 2:

        DPRINTF("%s: " TARGET_FMT_plx "=%04" PRIx64 "\n", __func__,

                addr, value);

        cpu_outw(addr, value);

        break;

    case 4:

        DPRINTF("%s: " TARGET_FMT_plx "=%08" PRIx64 "\n", __func__,

                addr, value);

        cpu_outl(addr, value);

        break;

    default:

        abort();

    }

}

static uint64_t i82378_io_read(void *opaque, hwaddr addr,

                               unsigned int size)

{

    DPRINTF("%s: " TARGET_FMT_plx "\n", __func__, addr);

    switch (size) {

    case 1:

        return cpu_inb(addr);

    case 2:

        return cpu_inw(addr);

    case 4:

        return cpu_inl(addr);

    default:

        abort();

    }

}

static const MemoryRegionOps i82378_io_ops = {

    .read = i82378_io_read,

    .write = i82378_io_write,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static void i82378_mem_write(void *opaque, hwaddr addr,

                             uint64_t value, unsigned int size)

{

    switch (size) {

    case 1:

        DPRINTF("%s: " TARGET_FMT_plx "=%02" PRIx64 "\n", __func__,

                addr, value);

        cpu_outb(addr, value);

        break;

    case 2:

        DPRINTF("%s: " TARGET_FMT_plx "=%04" PRIx64 "\n", __func__,

                addr, value);

        cpu_outw(addr, value);

        break;

    case 4:

        DPRINTF("%s: " TARGET_FMT_plx "=%08" PRIx64 "\n", __func__,

                addr, value);

        cpu_outl(addr, value);

        break;

    default:

        abort();

    }

}

static uint64_t i82378_mem_read(void *opaque, hwaddr addr,

                                unsigned int size)

{

    DPRINTF("%s: " TARGET_FMT_plx "\n", __func__, addr);

    switch (size) {

    case 1:

        return cpu_inb(addr);

    case 2:

        return cpu_inw(addr);

    case 4:

        return cpu_inl(addr);

    default:

        abort();

    }

}

static const MemoryRegionOps i82378_mem_ops = {

    .read = i82378_mem_read,

    .write = i82378_mem_write,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static void i82378_request_out0_irq(void *opaque, int irq, int level)

{

    I82378State *s = opaque;

    qemu_set_irq(s->out[0], level);

}

static void i82378_request_pic_irq(void *opaque, int irq, int level)

{

    DeviceState *dev = opaque;

    PCIDevice *pci = DO_UPCAST(PCIDevice, qdev, dev);

    PCIi82378State *s = DO_UPCAST(PCIi82378State, pci_dev, pci);

    qemu_set_irq(s->state.i8259[irq], level);

}

static void i82378_init(DeviceState *dev, I82378State *s)

{

    ISABus *isabus = DO_UPCAST(ISABus, qbus, qdev_get_child_bus(dev, "isa.0"));

    ISADevice *pit;

    ISADevice *isa;

    qemu_irq *out0_irq;

    /* This device has:

       2 82C59 (irq)

       1 82C54 (pit)

       2 82C37 (dma)

       NMI

       Utility Bus Support Registers

       All devices accept byte access only, except timer

     */

    qdev_init_gpio_out(dev, s->out, 2);

    qdev_init_gpio_in(dev, i82378_request_pic_irq, 16);

    /* Workaround the fact that i8259 is not qdev'ified... */

    out0_irq = qemu_allocate_irqs(i82378_request_out0_irq, s, 1);

    /* 2 82C59 (irq) */

    s->i8259 = i8259_init(isabus, *out0_irq);

    isa_bus_irqs(isabus, s->i8259);

    /* 1 82C54 (pit) */

    pit = pit_init(isabus, 0x40, 0, NULL);

    /* speaker */

    pcspk_init(isabus, pit);

    /* 2 82C37 (dma) */

    isa = isa_create_simple(isabus, "i82374");

    qdev_connect_gpio_out(&isa->qdev, 0, s->out[1]);

    /* timer */

    isa_create_simple(isabus, "mc146818rtc");

}

static int pci_i82378_init(PCIDevice *dev)

{

    PCIi82378State *pci = DO_UPCAST(PCIi82378State, pci_dev, dev);

    I82378State *s = &pci->state;

    uint8_t *pci_conf;

    pci_conf = dev->config;

    pci_set_word(pci_conf + PCI_COMMAND,

                 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);

    pci_set_word(pci_conf + PCI_STATUS,

                 PCI_STATUS_DEVSEL_MEDIUM);

    pci_conf[PCI_INTERRUPT_PIN] = 1; /* interrupt pin 0 */

    memory_region_init_io(&s->io, &i82378_io_ops, s, "i82378-io", 0x00010000);

    pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->io);

    memory_region_init_io(&s->mem, &i82378_mem_ops, s, "i82378-mem", 0x01000000);

    pci_register_bar(dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->mem);

    /* Make I/O address read only */

    pci_set_word(dev->wmask + PCI_COMMAND, PCI_COMMAND_SPECIAL);

    pci_set_long(dev->wmask + PCI_BASE_ADDRESS_0, 0);

    pci_set_long(pci_conf + PCI_BASE_ADDRESS_0, pci->isa_io_base);

    isa_mem_base = pci->isa_mem_base;

    isa_bus_new(&dev->qdev, pci_address_space_io(dev));

    i82378_init(&dev->qdev, s);

    return 0;

}

static Property i82378_properties[] = {

    DEFINE_PROP_HEX32("iobase", PCIi82378State, isa_io_base, 0x80000000),

    DEFINE_PROP_HEX32("membase", PCIi82378State, isa_mem_base, 0xc0000000),

    DEFINE_PROP_END_OF_LIST()

};

static void pci_i82378_class_init(ObjectClass *klass, void *data)

{

    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);

    k->init = pci_i82378_init;

    k->vendor_id = PCI_VENDOR_ID_INTEL;

    k->device_id = PCI_DEVICE_ID_INTEL_82378;

    k->revision = 0x03;

    k->class_id = PCI_CLASS_BRIDGE_ISA;

    k->subsystem_vendor_id = 0x0;

    k->subsystem_id = 0x0;

    dc->vmsd = &vmstate_pci_i82378;

    dc->props = i82378_properties;

}

static const TypeInfo pci_i82378_info = {

    .name = "i82378",

    .parent = TYPE_PCI_DEVICE,

    .instance_size = sizeof(PCIi82378State),

    .class_init = pci_i82378_class_init,

};

static void i82378_register_types(void)

{

    type_register_static(&pci_i82378_info);

}

type_init(i82378_register_types)