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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(PCIDevice *pci_dev, void *pic, int irq_num, int level);

PCIBus *i440fx_init(void)

{

    PCIBus *b;

    PCIDevice *d;

    I440FXState *s;

    s = qemu_mallocz(sizeof(I440FXState));

    b = pci_register_bus(piix3_set_irq, NULL, 0);

    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, NULL);

    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

    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 uint32_t pci_irq_levels[4][PCI_IRQ_WORDS];

/* 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 inline 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 inline int get_pci_irq_level(int irq_num)

{

    int pic_level;

#if (PCI_IRQ_WORDS == 2)

    pic_level = ((pci_irq_levels[irq_num][0] | 

                  pci_irq_levels[irq_num][1]) != 0);

#else

    {

        int i;

        pic_level = 0;

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

            if (pci_irq_levels[irq_num][i]) {

                pic_level = 1;

                break;

            }

        }

    }

#endif

    return pic_level;

}

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

{

    int irq_index, shift, pic_irq, pic_level;

    uint32_t *p;

    irq_num = pci_slot_get_pirq(pci_dev, irq_num);

    irq_index = pci_dev->irq_index;

    p = &pci_irq_levels[irq_num][irq_index >> 5];

    shift = (irq_index & 0x1f);

    *p = (*p & ~(1 << shift)) | (level << shift);

    /* 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;

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

            pic_level |= get_pci_irq_level(0);

        if (pic_irq == piix3_dev->config[0x61])

            pic_level |= get_pci_irq_level(1);

        if (pic_irq == piix3_dev->config[0x62])

            pic_level |= get_pci_irq_level(2);

        if (pic_irq == piix3_dev->config[0x63])

            pic_level |= get_pci_irq_level(3);

        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;

}

/***********************************************************/

/* XXX: the following should be moved to the PC BIOS */

static __attribute__((unused)) uint32_t isa_inb(uint32_t addr)

{

    return cpu_inb(NULL, addr);

}

static void isa_outb(uint32_t val, uint32_t addr)

{

    cpu_outb(NULL, addr, val);

}

static __attribute__((unused)) uint32_t isa_inw(uint32_t addr)

{

    return cpu_inw(NULL, addr);

}

static __attribute__((unused)) void isa_outw(uint32_t val, uint32_t addr)

{

    cpu_outw(NULL, addr, val);

}

static __attribute__((unused)) uint32_t isa_inl(uint32_t addr)

{

    return cpu_inl(NULL, addr);

}

static __attribute__((unused)) void isa_outl(uint32_t val, uint32_t addr)

{

    cpu_outl(NULL, addr, val);

}

static uint32_t pci_bios_io_addr;

static uint32_t pci_bios_mem_addr;

/* host irqs corresponding to PCI irqs A-D */

static uint8_t pci_irqs[4] = { 11, 9, 11, 9 };

static void pci_config_writel(PCIDevice *d, uint32_t addr, uint32_t val)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    pci_data_write(s, addr, val, 4);

}

static void pci_config_writew(PCIDevice *d, uint32_t addr, uint32_t val)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    pci_data_write(s, addr, val, 2);

}

static void pci_config_writeb(PCIDevice *d, uint32_t addr, uint32_t val)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    pci_data_write(s, addr, val, 1);

}

static __attribute__((unused)) uint32_t pci_config_readl(PCIDevice *d, uint32_t addr)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    return pci_data_read(s, addr, 4);

}

static uint32_t pci_config_readw(PCIDevice *d, uint32_t addr)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    return pci_data_read(s, addr, 2);

}

static uint32_t pci_config_readb(PCIDevice *d, uint32_t addr)

{

    PCIBus *s = d->bus;

    addr |= (pci_bus_num(s) << 16) | (d->devfn << 8);

    return pci_data_read(s, addr, 1);

}

static void pci_set_io_region_addr(PCIDevice *d, int region_num, uint32_t addr)

{

    PCIIORegion *r;

    uint16_t cmd;

    uint32_t ofs;

    if ( region_num == PCI_ROM_SLOT ) {

        ofs = 0x30;

    }else{

        ofs = 0x10 + region_num * 4;

    }

    pci_config_writel(d, ofs, addr);

    r = &d->io_regions[region_num];

    /* enable memory mappings */

    cmd = pci_config_readw(d, PCI_COMMAND);

    if ( region_num == PCI_ROM_SLOT )

        cmd |= 2;

    else if (r->type & PCI_ADDRESS_SPACE_IO)

        cmd |= 1;

    else

        cmd |= 2;

    pci_config_writew(d, PCI_COMMAND, cmd);

}

static void pci_bios_init_device(PCIDevice *d)

{

    int class;

    PCIIORegion *r;

    uint32_t *paddr;

    int i, pin, pic_irq, vendor_id, device_id;

    class = pci_config_readw(d, PCI_CLASS_DEVICE);

    vendor_id = pci_config_readw(d, PCI_VENDOR_ID);

    device_id = pci_config_readw(d, PCI_DEVICE_ID);

    switch(class) {

    case 0x0101:

        if (vendor_id == 0x8086 && device_id == 0x7010) {

            /* PIIX3 IDE */

            pci_config_writew(d, 0x40, 0x8000); // enable IDE0

            pci_config_writew(d, 0x42, 0x8000); // enable IDE1

            goto default_map;

        } else {

            /* IDE: we map it as in ISA mode */

            pci_set_io_region_addr(d, 0, 0x1f0);

            pci_set_io_region_addr(d, 1, 0x3f4);

            pci_set_io_region_addr(d, 2, 0x170);

            pci_set_io_region_addr(d, 3, 0x374);

        }

        break;

    case 0x0300:

        if (vendor_id != 0x1234)

            goto default_map;

        /* VGA: map frame buffer to default Bochs VBE address */

        pci_set_io_region_addr(d, 0, 0xE0000000);

        break;

    case 0x0800:

        /* PIC */

        vendor_id = pci_config_readw(d, PCI_VENDOR_ID);

        device_id = pci_config_readw(d, PCI_DEVICE_ID);

        if (vendor_id == 0x1014) {

            /* IBM */

            if (device_id == 0x0046 || device_id == 0xFFFF) {

                /* MPIC & MPIC2 */

                pci_set_io_region_addr(d, 0, 0x80800000 + 0x00040000);

            }

        }

        break;

    case 0xff00:

        if (vendor_id == 0x0106b &&

            (device_id == 0x0017 || device_id == 0x0022)) {

            /* macio bridge */

            pci_set_io_region_addr(d, 0, 0x80800000);

        }

        break;

    default:

    default_map:

        /* default memory mappings */

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

            r = &d->io_regions[i];

            if (r->size) {

                if (r->type & PCI_ADDRESS_SPACE_IO)

                    paddr = &pci_bios_io_addr;

                else

                    paddr = &pci_bios_mem_addr;

                *paddr = (*paddr + r->size - 1) & ~(r->size - 1);

                pci_set_io_region_addr(d, i, *paddr);

                *paddr += r->size;

            }

        }

        break;

    }

    /* map the interrupt */

    pin = pci_config_readb(d, PCI_INTERRUPT_PIN);

    if (pin != 0) {

        pin = pci_slot_get_pirq(d, pin - 1);

        pic_irq = pci_irqs[pin];

        pci_config_writeb(d, PCI_INTERRUPT_LINE, pic_irq);

    }

}

/*

 * This function initializes the PCI devices as a normal PCI BIOS

 * would do. It is provided just in case the BIOS has no support for

 * PCI.

 */

void pci_bios_init(void)

{

    int i, irq;

    uint8_t elcr[2];

    pci_bios_io_addr = 0xc000;

    pci_bios_mem_addr = 0xf0000000;

    /* activate IRQ mappings */

    elcr[0] = 0x00;

    elcr[1] = 0x00;

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

        irq = pci_irqs[i];

        /* set to trigger level */

        elcr[irq >> 3] |= (1 << (irq & 7));

        /* activate irq remapping in PIIX */

        pci_config_writeb(piix3_dev, 0x60 + i, irq);

    }

    isa_outb(elcr[0], 0x4d0);

    isa_outb(elcr[1], 0x4d1);

    pci_for_each_device(pci_bios_init_device);

}