Archipelago » qemu

/*

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

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program 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 General Public License for more details.

 *

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

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

 *

 * Copyright IBM Corp. 2008

 *

 * Authors: Hollis Blanchard <hollisb@us.ibm.com>

 */

/* This file implements emulation of the 32-bit PCI controller found in some

 * 4xx SoCs, such as the 440EP. */

#include "hw.h"

#include "ppc.h"

#include "ppc4xx.h"

#include "pci.h"

#include "pci_host.h"

#include "exec-memory.h"

#undef DEBUG

#ifdef DEBUG

#define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)

#else

#define DPRINTF(fmt, ...)

#endif /* DEBUG */

struct PCIMasterMap {

    uint32_t la;

    uint32_t ma;

    uint32_t pcila;

    uint32_t pciha;

};

struct PCITargetMap {

    uint32_t ms;

    uint32_t la;

};

#define PPC4xx_PCI_HOST_BRIDGE(obj) \

    OBJECT_CHECK(PPC4xxPCIState, (obj), TYPE_PPC4xx_PCI_HOST_BRIDGE)

#define PPC4xx_PCI_NR_PMMS 3

#define PPC4xx_PCI_NR_PTMS 2

struct PPC4xxPCIState {

    PCIHostState parent_obj;

    struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];

    struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];

    qemu_irq irq[4];

    MemoryRegion container;

    MemoryRegion iomem;

};

typedef struct PPC4xxPCIState PPC4xxPCIState;

#define PCIC0_CFGADDR       0x0

#define PCIC0_CFGDATA       0x4

/* PLB Memory Map (PMM) registers specify which PLB addresses are translated to

 * PCI accesses. */

#define PCIL0_PMM0LA        0x0

#define PCIL0_PMM0MA        0x4

#define PCIL0_PMM0PCILA     0x8

#define PCIL0_PMM0PCIHA     0xc

#define PCIL0_PMM1LA        0x10

#define PCIL0_PMM1MA        0x14

#define PCIL0_PMM1PCILA     0x18

#define PCIL0_PMM1PCIHA     0x1c

#define PCIL0_PMM2LA        0x20

#define PCIL0_PMM2MA        0x24

#define PCIL0_PMM2PCILA     0x28

#define PCIL0_PMM2PCIHA     0x2c

/* PCI Target Map (PTM) registers specify which PCI addresses are translated to

 * PLB accesses. */

#define PCIL0_PTM1MS        0x30

#define PCIL0_PTM1LA        0x34

#define PCIL0_PTM2MS        0x38

#define PCIL0_PTM2LA        0x3c

#define PCI_REG_BASE        0x800000

#define PCI_REG_SIZE        0x40

#define PCI_ALL_SIZE        (PCI_REG_BASE + PCI_REG_SIZE)

static uint64_t pci4xx_cfgaddr_read(void *opaque, target_phys_addr_t addr,

                                    unsigned size)

{

    PPC4xxPCIState *ppc4xx_pci = opaque;

    PCIHostState *phb = PCI_HOST_BRIDGE(ppc4xx_pci);

    return phb->config_reg;

}

static void pci4xx_cfgaddr_write(void *opaque, target_phys_addr_t addr,

                                  uint64_t value, unsigned size)

{

    PPC4xxPCIState *ppc4xx_pci = opaque;

    PCIHostState *phb = PCI_HOST_BRIDGE(ppc4xx_pci);

    phb->config_reg = value & ~0x3;

}

static const MemoryRegionOps pci4xx_cfgaddr_ops = {

    .read = pci4xx_cfgaddr_read,

    .write = pci4xx_cfgaddr_write,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,

                                  uint64_t value, unsigned size)

{

    struct PPC4xxPCIState *pci = opaque;

    /* We ignore all target attempts at PCI configuration, effectively

     * assuming a bidirectional 1:1 mapping of PLB and PCI space. */

    switch (offset) {

    case PCIL0_PMM0LA:

        pci->pmm[0].la = value;

        break;

    case PCIL0_PMM0MA:

        pci->pmm[0].ma = value;

        break;

    case PCIL0_PMM0PCIHA:

        pci->pmm[0].pciha = value;

        break;

    case PCIL0_PMM0PCILA:

        pci->pmm[0].pcila = value;

        break;

    case PCIL0_PMM1LA:

        pci->pmm[1].la = value;

        break;

    case PCIL0_PMM1MA:

        pci->pmm[1].ma = value;

        break;

    case PCIL0_PMM1PCIHA:

        pci->pmm[1].pciha = value;

        break;

    case PCIL0_PMM1PCILA:

        pci->pmm[1].pcila = value;

        break;

    case PCIL0_PMM2LA:

        pci->pmm[2].la = value;

        break;

    case PCIL0_PMM2MA:

        pci->pmm[2].ma = value;

        break;

    case PCIL0_PMM2PCIHA:

        pci->pmm[2].pciha = value;

        break;

    case PCIL0_PMM2PCILA:

        pci->pmm[2].pcila = value;

        break;

    case PCIL0_PTM1MS:

        pci->ptm[0].ms = value;

        break;

    case PCIL0_PTM1LA:

        pci->ptm[0].la = value;

        break;

    case PCIL0_PTM2MS:

        pci->ptm[1].ms = value;

        break;

    case PCIL0_PTM2LA:

        pci->ptm[1].la = value;

        break;

    default:

        printf("%s: unhandled PCI internal register 0x%lx\n", __func__,

               (unsigned long)offset);

        break;

    }

}

static uint64_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset,

                                     unsigned size)

{

    struct PPC4xxPCIState *pci = opaque;

    uint32_t value;

    switch (offset) {

    case PCIL0_PMM0LA:

        value = pci->pmm[0].la;

        break;

    case PCIL0_PMM0MA:

        value = pci->pmm[0].ma;

        break;

    case PCIL0_PMM0PCIHA:

        value = pci->pmm[0].pciha;

        break;

    case PCIL0_PMM0PCILA:

        value = pci->pmm[0].pcila;

        break;

    case PCIL0_PMM1LA:

        value = pci->pmm[1].la;

        break;

    case PCIL0_PMM1MA:

        value = pci->pmm[1].ma;

        break;

    case PCIL0_PMM1PCIHA:

        value = pci->pmm[1].pciha;

        break;

    case PCIL0_PMM1PCILA:

        value = pci->pmm[1].pcila;

        break;

    case PCIL0_PMM2LA:

        value = pci->pmm[2].la;

        break;

    case PCIL0_PMM2MA:

        value = pci->pmm[2].ma;

        break;

    case PCIL0_PMM2PCIHA:

        value = pci->pmm[2].pciha;

        break;

    case PCIL0_PMM2PCILA:

        value = pci->pmm[2].pcila;

        break;

    case PCIL0_PTM1MS:

        value = pci->ptm[0].ms;

        break;

    case PCIL0_PTM1LA:

        value = pci->ptm[0].la;

        break;

    case PCIL0_PTM2MS:

        value = pci->ptm[1].ms;

        break;

    case PCIL0_PTM2LA:

        value = pci->ptm[1].la;

        break;

    default:

        printf("%s: invalid PCI internal register 0x%lx\n", __func__,

               (unsigned long)offset);

        value = 0;

    }

    return value;

}

static const MemoryRegionOps pci_reg_ops = {

    .read = ppc4xx_pci_reg_read4,

    .write = ppc4xx_pci_reg_write4,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static void ppc4xx_pci_reset(void *opaque)

{

    struct PPC4xxPCIState *pci = opaque;

    memset(pci->pmm, 0, sizeof(pci->pmm));

    memset(pci->ptm, 0, sizeof(pci->ptm));

}

/* On Bamboo, all pins from each slot are tied to a single board IRQ. This

 * may need further refactoring for other boards. */

static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)

{

    int slot = pci_dev->devfn >> 3;

    DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,

            pci_dev->devfn, irq_num, slot);

    return slot - 1;

}

static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)

{

    qemu_irq *pci_irqs = opaque;

    DPRINTF("%s: PCI irq %d\n", __func__, irq_num);

    if (irq_num < 0) {

        fprintf(stderr, "%s: PCI irq %d\n", __func__, irq_num);

        return;

    }

    qemu_set_irq(pci_irqs[irq_num], level);

}

static const VMStateDescription vmstate_pci_master_map = {

    .name = "pci_master_map",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32(la, struct PCIMasterMap),

        VMSTATE_UINT32(ma, struct PCIMasterMap),

        VMSTATE_UINT32(pcila, struct PCIMasterMap),

        VMSTATE_UINT32(pciha, struct PCIMasterMap),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_pci_target_map = {

    .name = "pci_target_map",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32(ms, struct PCITargetMap),

        VMSTATE_UINT32(la, struct PCITargetMap),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_ppc4xx_pci = {

    .name = "ppc4xx_pci",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField[]) {

        VMSTATE_STRUCT_ARRAY(pmm, PPC4xxPCIState, PPC4xx_PCI_NR_PMMS, 1,

                             vmstate_pci_master_map,

                             struct PCIMasterMap),

        VMSTATE_STRUCT_ARRAY(ptm, PPC4xxPCIState, PPC4xx_PCI_NR_PTMS, 1,

                             vmstate_pci_target_map,

                             struct PCITargetMap),

        VMSTATE_END_OF_LIST()

    }

};

/* XXX Interrupt acknowledge cycles not supported. */

static int ppc4xx_pcihost_initfn(SysBusDevice *dev)

{

    PPC4xxPCIState *s;

    PCIHostState *h;

    PCIBus *b;

    int i;

    h = PCI_HOST_BRIDGE(dev);

    s = PPC4xx_PCI_HOST_BRIDGE(dev);

    for (i = 0; i < ARRAY_SIZE(s->irq); i++) {

        sysbus_init_irq(dev, &s->irq[i]);

    }

    b = pci_register_bus(DEVICE(dev), NULL, ppc4xx_pci_set_irq,

                         ppc4xx_pci_map_irq, s->irq, get_system_memory(),

                         get_system_io(), 0, 4);

    h->bus = b;

    pci_create_simple(b, 0, "ppc4xx-host-bridge");

    /* XXX split into 2 memory regions, one for config space, one for regs */

    memory_region_init(&s->container, "pci-container", PCI_ALL_SIZE);

    memory_region_init_io(&h->conf_mem, &pci_host_conf_le_ops, h,

                          "pci-conf-idx", 4);

    memory_region_init_io(&h->data_mem, &pci_host_data_le_ops, h,

                          "pci-conf-data", 4);

    memory_region_init_io(&s->iomem, &pci_reg_ops, s,

                          "pci.reg", PCI_REG_SIZE);

    memory_region_add_subregion(&s->container, PCIC0_CFGADDR, &h->conf_mem);

    memory_region_add_subregion(&s->container, PCIC0_CFGDATA, &h->data_mem);

    memory_region_add_subregion(&s->container, PCI_REG_BASE, &s->iomem);

    sysbus_init_mmio(dev, &s->container);

    qemu_register_reset(ppc4xx_pci_reset, s);

    return 0;

}

static void ppc4xx_host_bridge_class_init(ObjectClass *klass, void *data)

{

    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->desc        = "Host bridge";

    k->vendor_id    = PCI_VENDOR_ID_IBM;

    k->device_id    = PCI_DEVICE_ID_IBM_440GX;

    k->class_id     = PCI_CLASS_BRIDGE_OTHER;

}

static const TypeInfo ppc4xx_host_bridge_info = {

    .name          = "ppc4xx-host-bridge",

    .parent        = TYPE_PCI_DEVICE,

    .instance_size = sizeof(PCIDevice),

    .class_init    = ppc4xx_host_bridge_class_init,

};

static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)

{

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);

    k->init = ppc4xx_pcihost_initfn;

    dc->vmsd = &vmstate_ppc4xx_pci;

}

static const TypeInfo ppc4xx_pcihost_info = {

    .name          = TYPE_PPC4xx_PCI_HOST_BRIDGE,

    .parent        = TYPE_PCI_HOST_BRIDGE,

    .instance_size = sizeof(PPC4xxPCIState),

    .class_init    = ppc4xx_pcihost_class_init,

};

static void ppc4xx_pci_register_types(void)

{

    type_register_static(&ppc4xx_pcihost_info);

    type_register_static(&ppc4xx_host_bridge_info);

}

type_init(ppc4xx_pci_register_types)