Archipelago » qemu

/*

 * pci_host.c

 *

 * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>

 *                    VA Linux Systems Japan K.K.

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 * 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/>.

 */

#include "pci.h"

#include "pci_host.h"

/* debug PCI */

//#define DEBUG_PCI

#ifdef DEBUG_PCI

#define PCI_DPRINTF(fmt, ...) \

do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)

#else

#define PCI_DPRINTF(fmt, ...)

#endif

/*

 * PCI address

 * bit 16 - 24: bus number

 * bit  8 - 15: devfun number

 * bit  0 -  7: offset in configuration space of a given pci device

 */

/* the helper functio to get a PCIDeice* for a given pci address */

static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)

{

    uint8_t bus_num = addr >> 16;

    uint8_t devfn = addr >> 8;

    return pci_find_device(bus, bus_num, devfn);

}

void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,

                                  uint32_t limit, uint32_t val, uint32_t len)

{

    assert(len <= 4);

    pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));

}

uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,

                                     uint32_t limit, uint32_t len)

{

    assert(len <= 4);

    return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));

}

void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)

{

    PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);

    uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

    if (!pci_dev) {

        return;

    }

    PCI_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",

                __func__, pci_dev->name, config_addr, val, len);

    pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,

                                 val, len);

}

uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)

{

    PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);

    uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

    uint32_t val;

    if (!pci_dev) {

        return ~0x0;

    }

    val = pci_host_config_read_common(pci_dev, config_addr,

                                      PCI_CONFIG_SPACE_SIZE, len);

    PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",

                __func__, pci_dev->name, config_addr, val, len);

    return val;

}

static void pci_host_config_write(void *opaque, target_phys_addr_t addr,

                                  uint64_t val, unsigned len)

{

    PCIHostState *s = opaque;

    PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",

                __func__, addr, len, val);

    if (addr != 0 || len != 4) {

        return;

    }

    s->config_reg = val;

}

static uint64_t pci_host_config_read(void *opaque, target_phys_addr_t addr,

                                     unsigned len)

{

    PCIHostState *s = opaque;

    uint32_t val = s->config_reg;

    PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx32"\n",

                __func__, addr, len, val);

    return val;

}

static void pci_host_data_write(void *opaque, target_phys_addr_t addr,

                                uint64_t val, unsigned len)

{

    PCIHostState *s = opaque;

    PCI_DPRINTF("write addr " TARGET_FMT_plx " len %d val %x\n",

                addr, len, (unsigned)val);

    if (s->config_reg & (1u << 31))

        pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);

}

static uint64_t pci_host_data_read(void *opaque,

                                   target_phys_addr_t addr, unsigned len)

{

    PCIHostState *s = opaque;

    uint32_t val;

    if (!(s->config_reg & (1 << 31)))

        return 0xffffffff;

    val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);

    PCI_DPRINTF("read addr " TARGET_FMT_plx " len %d val %x\n",

                addr, len, val);

    return val;

}

const MemoryRegionOps pci_host_conf_le_ops = {

    .read = pci_host_config_read,

    .write = pci_host_config_write,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

const MemoryRegionOps pci_host_conf_be_ops = {

    .read = pci_host_config_read,

    .write = pci_host_config_write,

    .endianness = DEVICE_BIG_ENDIAN,

};

const MemoryRegionOps pci_host_data_le_ops = {

    .read = pci_host_data_read,

    .write = pci_host_data_write,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

const MemoryRegionOps pci_host_data_be_ops = {

    .read = pci_host_data_read,

    .write = pci_host_data_write,

    .endianness = DEVICE_BIG_ENDIAN,

};

static const TypeInfo pci_host_type_info = {

    .name = TYPE_PCI_HOST_BRIDGE,

    .parent = TYPE_SYS_BUS_DEVICE,

    .abstract = true,

    .instance_size = sizeof(PCIHostState),

};

static void pci_host_register_types(void)

{

    type_register_static(&pci_host_type_info);

}

type_init(pci_host_register_types)