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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 "vl.h"

typedef uint32_t pci_addr_t;

#include "pci_host.h"

typedef PCIHostState I440FXState;

static void i440fx_addr_writel(void* opaque, uint32_t addr, uint32_t val)

{

    I440FXState *s = opaque;

    s->config_reg = val;

}

static uint32_t i440fx_addr_readl(void* opaque, uint32_t addr)

{

    I440FXState *s = opaque;

    return s->config_reg;

}

static void piix3_set_irq(void *pic, int irq_num, int level);

/* 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 irq_num)

{

    int slot_addend;

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

    return (irq_num + slot_addend) & 3;

}

static uint32_t isa_page_descs[384 / 4];

static uint8_t smm_enabled;

static const uint32_t mar_addresses[15] = {

    0xa0000,

    0xc0000,

    0xc4000,

    0xc8000,

    0xcc000,

    0xd0000,

    0xd4000,

    0xd8000,

    0xdc000,

    0xe0000,

    0xe4000,

    0xe8000,

    0xec000,

    0xf0000,

    0x100000,

};

static void i440fx_update_memory_mappings(PCIDevice *d)

{

    int i, r;

    uint32_t start, end, addr;

    uint32_t smram, smbase, smsize;

    for(i = 0; i < 14; i++) {

        r = (d->config[(i >> 1) + 0x61] >> ((i & 1) * 4)) & 3;

        start = mar_addresses[i];

        end = mar_addresses[i + 1];

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

        switch(r) {

        case 3:

            /* RAM */

            cpu_register_physical_memory(start, end - start, 

                                         start);

            break;

        case 2:

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

            cpu_register_physical_memory(start, end - start, 

                                         start | IO_MEM_ROM);

            break;

        case 1:

        case 0:

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

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

                cpu_register_physical_memory(addr, 4096, 

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

            }

            break;

        }

    }

    smram = le32_to_cpu(*(uint32_t *)(d->config + 0x6c));

    if ((smm_enabled && (smram & 0x80000000)) || (smram & (1 << 26))) {

        /* Note: we assume the SMM area is in the 0xa0000-0x100000 range */

        smbase = (smram & 0xffff) << 16;

        smsize = (((smram >> 20) & 0xf) + 1) << 16;

        if (smbase >= 0xa0000 && (smbase + smsize) <= 0x100000) {

            cpu_register_physical_memory(smbase, smsize, smbase);

        }

    }

}

void i440fx_set_smm(PCIDevice *d, int val)

{

    val = (val != 0);

    if (smm_enabled != val) {

        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(PCIDevice *d)

{

    int i;

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

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

    }

}

static void i440fx_write_config(PCIDevice *d, 

                                uint32_t address, uint32_t val, int len)

{

    /* XXX: implement SMRAM.D_LOCK */

    pci_default_write_config(d, address, val, len);

    if ((address >= 0x61 && address <= 0x67) || address == 0x6c)

        i440fx_update_memory_mappings(d);

}

static void i440fx_save(QEMUFile* f, void *opaque)

{

    PCIDevice *d = opaque;

    pci_device_save(d, f);

    qemu_put_8s(f, &smm_enabled);

}

static int i440fx_load(QEMUFile* f, void *opaque, int version_id)

{

    PCIDevice *d = opaque;

    int ret;

    if (version_id != 1)

        return -EINVAL;

    ret = pci_device_load(d, f);

    if (ret < 0)

        return ret;

    i440fx_update_memory_mappings(d);

    qemu_get_8s(f, &smm_enabled);

    return 0;

}

PCIBus *i440fx_init(PCIDevice **pi440fx_state)

{

    PCIBus *b;

    PCIDevice *d;

    I440FXState *s;

    s = qemu_mallocz(sizeof(I440FXState));

    b = pci_register_bus(piix3_set_irq, pci_slot_get_pirq, NULL, 0, 4);

    s->bus = b;

    register_ioport_write(0xcf8, 4, 4, i440fx_addr_writel, s);

    register_ioport_read(0xcf8, 4, 4, i440fx_addr_readl, s);

    register_ioport_write(0xcfc, 4, 1, pci_host_data_writeb, s);

    register_ioport_write(0xcfc, 4, 2, pci_host_data_writew, s);

    register_ioport_write(0xcfc, 4, 4, pci_host_data_writel, s);

    register_ioport_read(0xcfc, 4, 1, pci_host_data_readb, s);

    register_ioport_read(0xcfc, 4, 2, pci_host_data_readw, s);

    register_ioport_read(0xcfc, 4, 4, pci_host_data_readl, s);

    d = pci_register_device(b, "i440FX", sizeof(PCIDevice), 0, 

                            NULL, i440fx_write_config);

    d->config[0x00] = 0x86; // vendor_id

    d->config[0x01] = 0x80;

    d->config[0x02] = 0x37; // device_id

    d->config[0x03] = 0x12;

    d->config[0x08] = 0x02; // revision

    d->config[0x0a] = 0x00; // class_sub = host2pci

    d->config[0x0b] = 0x06; // class_base = PCI_bridge

    d->config[0x0e] = 0x00; // header_type

    d->config[0x6c] = 0x0a; /* SMRAM */

    register_savevm("I440FX", 0, 1, i440fx_save, i440fx_load, d);

    *pi440fx_state = d;

    return b;

}

/* PIIX3 PCI to ISA bridge */

static PCIDevice *piix3_dev;

/* just used for simpler irq handling. */

#define PCI_IRQ_WORDS   ((PCI_DEVICES_MAX + 31) / 32)

static int pci_irq_levels[4];

static void piix3_set_irq(void *pic, int irq_num, int level)

{

    int i, pic_irq, pic_level;

    pci_irq_levels[irq_num] = level;

    /* now we change the pic irq level according to the piix irq mappings */

    /* XXX: optimize */

    pic_irq = piix3_dev->config[0x60 + irq_num];

    if (pic_irq < 16) {

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

           to it */

        pic_level = 0;

        for (i = 0; i < 4; i++) {

            if (pic_irq == piix3_dev->config[0x60 + i])

                pic_level |= pci_irq_levels[i];

        }

        pic_set_irq(pic_irq, pic_level);

    }

}

static void piix3_reset(PCIDevice *d)

{

    uint8_t *pci_conf = d->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[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[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;

}

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

{

    PCIDevice *d = opaque;

    pci_device_save(d, f);

}

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

{

    PCIDevice *d = opaque;

    if (version_id != 2)

        return -EINVAL;

    return pci_device_load(d, f);

}

int piix3_init(PCIBus *bus)

{

    PCIDevice *d;

    uint8_t *pci_conf;

    d = pci_register_device(bus, "PIIX3", sizeof(PCIDevice),

                                    -1, NULL, NULL);

    register_savevm("PIIX3", 0, 2, piix_save, piix_load, d);

    piix3_dev = d;

    pci_conf = d->config;

    pci_conf[0x00] = 0x86; // Intel

    pci_conf[0x01] = 0x80;

    pci_conf[0x02] = 0x00; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)

    pci_conf[0x03] = 0x70;

    pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA

    pci_conf[0x0b] = 0x06; // class_base = PCI_bridge

    pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

    piix3_reset(d);

    return d->devfn;

}