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/*

 * QEMU i440FX/PIIX3 PCI Bridge Emulation

 *

 * Copyright (c) 2006 Fabrice Bellard

 *

 * 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 "hw.h"

#include "pc.h"

#include "pci.h"

#include "pci_host.h"

#include "isa.h"

#include "sysbus.h"

#include "range.h"

#include "xen.h"

/*

 * I440FX chipset data sheet.

 * http://download.intel.com/design/chipsets/datashts/29054901.pdf

 */

typedef PCIHostState I440FXState;

#define PIIX_NUM_PIC_IRQS       16      /* i8259 * 2 */

#define PIIX_NUM_PIRQS          4ULL    /* PIRQ[A-D] */

#define XEN_PIIX_NUM_PIRQS      128ULL

#define PIIX_PIRQC              0x60

typedef struct PIIX3State {

    PCIDevice dev;

    /*

     * bitmap to track pic levels.

     * The pic level is the logical OR of all the PCI irqs mapped to it

     * So one PIC level is tracked by PIIX_NUM_PIRQS bits.

     *

     * PIRQ is mapped to PIC pins, we track it by

     * PIIX_NUM_PIRQS * PIIX_NUM_PIC_IRQS = 64 bits with

     * pic_irq * PIIX_NUM_PIRQS + pirq

     */

#if PIIX_NUM_PIC_IRQS * PIIX_NUM_PIRQS > 64

#error "unable to encode pic state in 64bit in pic_levels."

#endif

    uint64_t pic_levels;

    qemu_irq *pic;

    /* This member isn't used. Just for save/load compatibility */

    int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS];

} PIIX3State;

struct PCII440FXState {

    PCIDevice dev;

    target_phys_addr_t isa_page_descs[384 / 4];

    uint8_t smm_enabled;

    PIIX3State *piix3;

};

#define I440FX_PAM      0x59

#define I440FX_PAM_SIZE 7

#define I440FX_SMRAM    0x72

static void piix3_set_irq(void *opaque, int pirq, int level);

static void piix3_write_config_xen(PCIDevice *dev,

                               uint32_t address, uint32_t val, int len);

/* return the global irq number corresponding to a given device irq

   pin. We could also use the bus number to have a more precise

   mapping. */

static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)

{

    int slot_addend;

    slot_addend = (pci_dev->devfn >> 3) - 1;

    return (pci_intx + slot_addend) & 3;

}

static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)

{

    uint32_t addr;

    //    printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);

    switch(r) {

    case 3:

        /* RAM */

        cpu_register_physical_memory(start, end - start,

                                     start);

        break;

    case 1:

        /* ROM (XXX: not quite correct) */

        cpu_register_physical_memory(start, end - start,

                                     start | IO_MEM_ROM);

        break;

    case 2:

    case 0:

        /* XXX: should distinguish read/write cases */

        for(addr = start; addr < end; addr += 4096) {

            cpu_register_physical_memory(addr, 4096,

                                         d->isa_page_descs[(addr - 0xa0000) >> 12]);

        }

        break;

    }

}

static void i440fx_update_memory_mappings(PCII440FXState *d)

{

    int i, r;

    uint32_t smram, addr;

    update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3);

    for(i = 0; i < 12; i++) {

        r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;

        update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);

    }

    smram = d->dev.config[I440FX_SMRAM];

    if ((d->smm_enabled && (smram & 0x08)) || (smram & 0x40)) {

        cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);

    } else {

        for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {

            cpu_register_physical_memory(addr, 4096,

                                         d->isa_page_descs[(addr - 0xa0000) >> 12]);

        }

    }

}

static void i440fx_set_smm(int val, void *arg)

{

    PCII440FXState *d = arg;

    val = (val != 0);

    if (d->smm_enabled != val) {

        d->smm_enabled = val;

        i440fx_update_memory_mappings(d);

    }

}

/* XXX: suppress when better memory API. We make the assumption that

   no device (in particular the VGA) changes the memory mappings in

   the 0xa0000-0x100000 range */

void i440fx_init_memory_mappings(PCII440FXState *d)

{

    int i;

    for(i = 0; i < 96; i++) {

        d->isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);

    }

}

static void i440fx_write_config(PCIDevice *dev,

                                uint32_t address, uint32_t val, int len)

{

    PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

    /* XXX: implement SMRAM.D_LOCK */

    pci_default_write_config(dev, address, val, len);

    if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||

        range_covers_byte(address, len, I440FX_SMRAM)) {

        i440fx_update_memory_mappings(d);

    }

}

static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)

{

    PCII440FXState *d = opaque;

    int ret, i;

    ret = pci_device_load(&d->dev, f);

    if (ret < 0)

        return ret;

    i440fx_update_memory_mappings(d);

    qemu_get_8s(f, &d->smm_enabled);

    if (version_id == 2) {

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

            qemu_get_be32(f); /* dummy load for compatibility */

        }

    }

    return 0;

}

static int i440fx_post_load(void *opaque, int version_id)

{

    PCII440FXState *d = opaque;

    i440fx_update_memory_mappings(d);

    return 0;

}

static const VMStateDescription vmstate_i440fx = {

    .name = "I440FX",

    .version_id = 3,

    .minimum_version_id = 3,

    .minimum_version_id_old = 1,

    .load_state_old = i440fx_load_old,

    .post_load = i440fx_post_load,

    .fields      = (VMStateField []) {

        VMSTATE_PCI_DEVICE(dev, PCII440FXState),

        VMSTATE_UINT8(smm_enabled, PCII440FXState),

        VMSTATE_END_OF_LIST()

    }

};

static int i440fx_pcihost_initfn(SysBusDevice *dev)

{

    I440FXState *s = FROM_SYSBUS(I440FXState, dev);

    pci_host_conf_register_ioport(0xcf8, s);

    pci_host_data_register_ioport(0xcfc, s);

    return 0;

}

static int i440fx_initfn(PCIDevice *dev)

{

    PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

    d->dev.config[I440FX_SMRAM] = 0x02;

    cpu_smm_register(&i440fx_set_smm, d);

    return 0;

}

static PCIBus *i440fx_common_init(const char *device_name,

                                  PCII440FXState **pi440fx_state,

                                  int *piix3_devfn,

                                  qemu_irq *pic, ram_addr_t ram_size)

{

    DeviceState *dev;

    PCIBus *b;

    PCIDevice *d;

    I440FXState *s;

    PIIX3State *piix3;

    dev = qdev_create(NULL, "i440FX-pcihost");

    s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));

    b = pci_bus_new(&s->busdev.qdev, NULL, 0);

    s->bus = b;

    qdev_init_nofail(dev);

    d = pci_create_simple(b, 0, device_name);

    *pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);

    /* Xen supports additional interrupt routes from the PCI devices to

     * the IOAPIC: the four pins of each PCI device on the bus are also

     * connected to the IOAPIC directly.

     * These additional routes can be discovered through ACPI. */

    if (xen_enabled()) {

        piix3 = DO_UPCAST(PIIX3State, dev,

                pci_create_simple_multifunction(b, -1, true, "PIIX3-xen"));

        pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,

                piix3, XEN_PIIX_NUM_PIRQS);

    } else {

        piix3 = DO_UPCAST(PIIX3State, dev,

                pci_create_simple_multifunction(b, -1, true, "PIIX3"));

        pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3,

                PIIX_NUM_PIRQS);

    }

    piix3->pic = pic;

    (*pi440fx_state)->piix3 = piix3;

    *piix3_devfn = piix3->dev.devfn;

    ram_size = ram_size / 8 / 1024 / 1024;

    if (ram_size > 255)

        ram_size = 255;

    (*pi440fx_state)->dev.config[0x57]=ram_size;

    return b;

}

PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn,

                    qemu_irq *pic, ram_addr_t ram_size)

{

    PCIBus *b;

    b = i440fx_common_init("i440FX", pi440fx_state, piix3_devfn, pic, ram_size);

    return b;

}

/* PIIX3 PCI to ISA bridge */

static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)

{

    qemu_set_irq(piix3->pic[pic_irq],

                 !!(piix3->pic_levels &

                    (((1ULL << PIIX_NUM_PIRQS) - 1) <<

                     (pic_irq * PIIX_NUM_PIRQS))));

}

static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)

{

    int pic_irq;

    uint64_t mask;

    pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];

    if (pic_irq >= PIIX_NUM_PIC_IRQS) {

        return;

    }

    mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);

    piix3->pic_levels &= ~mask;

    piix3->pic_levels |= mask * !!level;

    piix3_set_irq_pic(piix3, pic_irq);

}

static void piix3_set_irq(void *opaque, int pirq, int level)

{

    PIIX3State *piix3 = opaque;

    piix3_set_irq_level(piix3, pirq, level);

}

/* irq routing is changed. so rebuild bitmap */

static void piix3_update_irq_levels(PIIX3State *piix3)

{

    int pirq;

    piix3->pic_levels = 0;

    for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {

        piix3_set_irq_level(piix3, pirq,

                            pci_bus_get_irq_level(piix3->dev.bus, pirq));

    }

}

static void piix3_write_config(PCIDevice *dev,

                               uint32_t address, uint32_t val, int len)

{

    pci_default_write_config(dev, address, val, len);

    if (ranges_overlap(address, len, PIIX_PIRQC, 4)) {

        PIIX3State *piix3 = DO_UPCAST(PIIX3State, dev, dev);

        int pic_irq;

        piix3_update_irq_levels(piix3);

        for (pic_irq = 0; pic_irq < PIIX_NUM_PIC_IRQS; pic_irq++) {

            piix3_set_irq_pic(piix3, pic_irq);

        }

    }

}

static void piix3_write_config_xen(PCIDevice *dev,

                               uint32_t address, uint32_t val, int len)

{

    xen_piix_pci_write_config_client(address, val, len);

    piix3_write_config(dev, address, val, len);

}

static void piix3_reset(void *opaque)

{

    PIIX3State *d = opaque;

    uint8_t *pci_conf = d->dev.config;

    pci_conf[0x04] = 0x07; // master, memory and I/O

    pci_conf[0x05] = 0x00;

    pci_conf[0x06] = 0x00;

    pci_conf[0x07] = 0x02; // PCI_status_devsel_medium

    pci_conf[0x4c] = 0x4d;

    pci_conf[0x4e] = 0x03;

    pci_conf[0x4f] = 0x00;

    pci_conf[0x60] = 0x80;

    pci_conf[0x61] = 0x80;

    pci_conf[0x62] = 0x80;

    pci_conf[0x63] = 0x80;

    pci_conf[0x69] = 0x02;

    pci_conf[0x70] = 0x80;

    pci_conf[0x76] = 0x0c;

    pci_conf[0x77] = 0x0c;

    pci_conf[0x78] = 0x02;

    pci_conf[0x79] = 0x00;

    pci_conf[0x80] = 0x00;

    pci_conf[0x82] = 0x00;

    pci_conf[0xa0] = 0x08;

    pci_conf[0xa2] = 0x00;

    pci_conf[0xa3] = 0x00;

    pci_conf[0xa4] = 0x00;

    pci_conf[0xa5] = 0x00;

    pci_conf[0xa6] = 0x00;

    pci_conf[0xa7] = 0x00;

    pci_conf[0xa8] = 0x0f;

    pci_conf[0xaa] = 0x00;

    pci_conf[0xab] = 0x00;

    pci_conf[0xac] = 0x00;

    pci_conf[0xae] = 0x00;

    d->pic_levels = 0;

}

static int piix3_post_load(void *opaque, int version_id)

{

    PIIX3State *piix3 = opaque;

    piix3_update_irq_levels(piix3);

    return 0;

}

static void piix3_pre_save(void *opaque)

{

    int i;

    PIIX3State *piix3 = opaque;

    for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) {

        piix3->pci_irq_levels_vmstate[i] =

            pci_bus_get_irq_level(piix3->dev.bus, i);

    }

}

static const VMStateDescription vmstate_piix3 = {

    .name = "PIIX3",

    .version_id = 3,

    .minimum_version_id = 2,

    .minimum_version_id_old = 2,

    .post_load = piix3_post_load,

    .pre_save = piix3_pre_save,

    .fields      = (VMStateField []) {

        VMSTATE_PCI_DEVICE(dev, PIIX3State),

        VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIX3State,

                              PIIX_NUM_PIRQS, 3),

        VMSTATE_END_OF_LIST()

    }

};

static int piix3_initfn(PCIDevice *dev)

{

    PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);

    isa_bus_new(&d->dev.qdev);

    qemu_register_reset(piix3_reset, d);

    return 0;

}

static PCIDeviceInfo i440fx_info[] = {

    {

        .qdev.name    = "i440FX",

        .qdev.desc    = "Host bridge",

        .qdev.size    = sizeof(PCII440FXState),

        .qdev.vmsd    = &vmstate_i440fx,

        .qdev.no_user = 1,

        .no_hotplug   = 1,

        .init         = i440fx_initfn,

        .config_write = i440fx_write_config,

        .vendor_id    = PCI_VENDOR_ID_INTEL,

        .device_id    = PCI_DEVICE_ID_INTEL_82441,

        .revision     = 0x02,

        .class_id     = PCI_CLASS_BRIDGE_HOST,

    },{

        .qdev.name    = "PIIX3",

        .qdev.desc    = "ISA bridge",

        .qdev.size    = sizeof(PIIX3State),

        .qdev.vmsd    = &vmstate_piix3,

        .qdev.no_user = 1,

        .no_hotplug   = 1,

        .init         = piix3_initfn,

        .config_write = piix3_write_config,

        .vendor_id    = PCI_VENDOR_ID_INTEL,

        .device_id    = PCI_DEVICE_ID_INTEL_82371SB_0, // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)

        .class_id     = PCI_CLASS_BRIDGE_ISA,

    },{

        .qdev.name    = "PIIX3-xen",

        .qdev.desc    = "ISA bridge",

        .qdev.size    = sizeof(PIIX3State),

        .qdev.vmsd    = &vmstate_piix3,

        .qdev.no_user = 1,

        .no_hotplug   = 1,

        .init         = piix3_initfn,

        .config_write = piix3_write_config_xen,

    },{

        /* end of list */

    }

};

static SysBusDeviceInfo i440fx_pcihost_info = {

    .init         = i440fx_pcihost_initfn,

    .qdev.name    = "i440FX-pcihost",

    .qdev.fw_name = "pci",

    .qdev.size    = sizeof(I440FXState),

    .qdev.no_user = 1,

};

static void i440fx_register(void)

{

    sysbus_register_withprop(&i440fx_pcihost_info);

    pci_qdev_register_many(i440fx_info);

}

device_init(i440fx_register);