/*

 * QEMU Common PCI Host bridge configuration data space access routines.

 *

 * 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.

 */

/* Worker routines for a PCI host controller that uses an {address,data}

   register pair to access PCI configuration space.  */

typedef struct {

    uint32_t config_reg;

    PCIBus *bus;

} PCIHostState;

static void pci_host_data_writeb(void* opaque, pci_addr_t addr, uint32_t val)

{

    PCIHostState *s = opaque;

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

        pci_data_write(s->bus, s->config_reg | (addr & 3), val, 1);

}

static void pci_host_data_writew(void* opaque, pci_addr_t addr, uint32_t val)

{

    PCIHostState *s = opaque;

#ifdef TARGET_WORDS_BIGENDIAN

    val = bswap16(val);

#endif

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

        pci_data_write(s->bus, s->config_reg | (addr & 3), val, 2);

}

static void pci_host_data_writel(void* opaque, pci_addr_t addr, uint32_t val)

{

    PCIHostState *s = opaque;

#ifdef TARGET_WORDS_BIGENDIAN

    val = bswap32(val);

#endif

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

        pci_data_write(s->bus, s->config_reg, val, 4);

}

static uint32_t pci_host_data_readb(void* opaque, pci_addr_t addr)

{

    PCIHostState *s = opaque;

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

        return 0xff;

    return pci_data_read(s->bus, s->config_reg | (addr & 3), 1);

}

static uint32_t pci_host_data_readw(void* opaque, pci_addr_t addr)

{

    PCIHostState *s = opaque;

    uint32_t val;

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

        return 0xffff;

    val = pci_data_read(s->bus, s->config_reg | (addr & 3), 2);

#ifdef TARGET_WORDS_BIGENDIAN

    val = bswap16(val);

#endif

    return val;

}

static uint32_t pci_host_data_readl(void* opaque, pci_addr_t addr)

{

    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), 4);

#ifdef TARGET_WORDS_BIGENDIAN

    val = bswap32(val);

#endif

    return val;

}