hw/ppc4xx_pci.c - qemu - Git at Google

 /*
  * 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 "bswap.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_NR_PMMS 3
 #define PPC4xx_PCI_NR_PTMS 2

 struct PPC4xxPCIState {
     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];

     PCIHostState pci_state;
     PCIDevice *pci_dev;
 };
 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_SIZE        0x40


 static uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
 {
     PPC4xxPCIState *ppc4xx_pci = opaque;

     return ppc4xx_pci->pci_state.config_reg;
 }

 static CPUReadMemoryFunc * const pci4xx_cfgaddr_read[] = {
     &pci4xx_cfgaddr_readl,
     &pci4xx_cfgaddr_readl,
     &pci4xx_cfgaddr_readl,
 };

 static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
                                   uint32_t value)
 {
     PPC4xxPCIState *ppc4xx_pci = opaque;

 #ifdef TARGET_WORDS_BIGENDIAN
     value = bswap32(value);
 #endif

     ppc4xx_pci->pci_state.config_reg = value & ~0x3;
 }

 static CPUWriteMemoryFunc * const pci4xx_cfgaddr_write[] = {
     &pci4xx_cfgaddr_writel,
     &pci4xx_cfgaddr_writel,
     &pci4xx_cfgaddr_writel,
 };

 static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
                                   uint32_t value)
 {
     struct PPC4xxPCIState *pci = opaque;

 #ifdef TARGET_WORDS_BIGENDIAN
     value = bswap32(value);
 #endif

     /* 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 uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
 {
     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;
     }

 #ifdef TARGET_WORDS_BIGENDIAN
     value = bswap32(value);
 #endif

     return value;
 }

 static CPUReadMemoryFunc * const pci_reg_read[] = {
     &ppc4xx_pci_reg_read4,
     &ppc4xx_pci_reg_read4,
     &ppc4xx_pci_reg_read4,
 };

 static CPUWriteMemoryFunc * const pci_reg_write[] = {
     &ppc4xx_pci_reg_write4,
     &ppc4xx_pci_reg_write4,
     &ppc4xx_pci_reg_write4,
 };

 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);
     qemu_set_irq(pci_irqs[irq_num], level);
 }

 static void ppc4xx_pci_save(QEMUFile *f, void *opaque)
 {
     PPC4xxPCIState *controller = opaque;
     int i;

     pci_device_save(controller->pci_dev, f);

     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
         qemu_put_be32s(f, &controller->pmm[i].la);
         qemu_put_be32s(f, &controller->pmm[i].ma);
         qemu_put_be32s(f, &controller->pmm[i].pcila);
         qemu_put_be32s(f, &controller->pmm[i].pciha);
     }

     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
         qemu_put_be32s(f, &controller->ptm[i].ms);
         qemu_put_be32s(f, &controller->ptm[i].la);
     }
 }

 static int ppc4xx_pci_load(QEMUFile *f, void *opaque, int version_id)
 {
     PPC4xxPCIState *controller = opaque;
     int i;

     if (version_id != 1)
         return -EINVAL;

     pci_device_load(controller->pci_dev, f);

     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
         qemu_get_be32s(f, &controller->pmm[i].la);
         qemu_get_be32s(f, &controller->pmm[i].ma);
         qemu_get_be32s(f, &controller->pmm[i].pcila);
         qemu_get_be32s(f, &controller->pmm[i].pciha);
     }

     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
         qemu_get_be32s(f, &controller->ptm[i].ms);
         qemu_get_be32s(f, &controller->ptm[i].la);
     }

     return 0;
 }

 /* XXX Interrupt acknowledge cycles not supported. */
 PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
                         target_phys_addr_t config_space,
                         target_phys_addr_t int_ack,
                         target_phys_addr_t special_cycle,
                         target_phys_addr_t registers)
 {
     PPC4xxPCIState *controller;
     int index;
     static int ppc4xx_pci_id;
     uint8_t *pci_conf;

     controller = qemu_mallocz(sizeof(PPC4xxPCIState));

     controller->pci_state.bus = pci_register_bus(NULL, "pci",
                                                  ppc4xx_pci_set_irq,
                                                  ppc4xx_pci_map_irq,
                                                  pci_irqs, 0, 4);

     controller->pci_dev = pci_register_device(controller->pci_state.bus,
                                               "host bridge", sizeof(PCIDevice),
                                               0, NULL, NULL);
     pci_conf = controller->pci_dev->config;
     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_IBM);
     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_IBM_440GX);
     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);

     /* CFGADDR */
     index = cpu_register_io_memory(pci4xx_cfgaddr_read,
                                    pci4xx_cfgaddr_write, controller);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);

     /* CFGDATA */
     index = pci_host_data_register_mmio(&controller->pci_state);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);

     /* Internal registers */
     index = cpu_register_io_memory(pci_reg_read, pci_reg_write, controller);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(registers, PCI_REG_SIZE, index);

     qemu_register_reset(ppc4xx_pci_reset, controller);

     /* XXX load/save code not tested. */
     register_savevm("ppc4xx_pci", ppc4xx_pci_id++, 1,
                     ppc4xx_pci_save, ppc4xx_pci_load, controller);

     return controller->pci_state.bus;

 free:
     printf("%s error\n", __func__);
     qemu_free(controller);
     return NULL;
 }
	/*
	* 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 "bswap.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_NR_PMMS 3
	#define PPC4xx_PCI_NR_PTMS 2

	struct PPC4xxPCIState {
	struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
	struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];

	PCIHostState pci_state;
	PCIDevice *pci_dev;
	};
	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_SIZE 0x40


	static uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
	{
	PPC4xxPCIState *ppc4xx_pci = opaque;

	return ppc4xx_pci->pci_state.config_reg;
	}

	static CPUReadMemoryFunc * const pci4xx_cfgaddr_read[] = {
	&pci4xx_cfgaddr_readl,
	&pci4xx_cfgaddr_readl,
	&pci4xx_cfgaddr_readl,
	};

	static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
	uint32_t value)
	{
	PPC4xxPCIState *ppc4xx_pci = opaque;

	#ifdef TARGET_WORDS_BIGENDIAN
	value = bswap32(value);
	#endif

	ppc4xx_pci->pci_state.config_reg = value & ~0x3;
	}

	static CPUWriteMemoryFunc * const pci4xx_cfgaddr_write[] = {
	&pci4xx_cfgaddr_writel,
	&pci4xx_cfgaddr_writel,
	&pci4xx_cfgaddr_writel,
	};

	static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
	uint32_t value)
	{
	struct PPC4xxPCIState *pci = opaque;

	#ifdef TARGET_WORDS_BIGENDIAN
	value = bswap32(value);
	#endif

	/* 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 uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
	{
	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;
	}

	#ifdef TARGET_WORDS_BIGENDIAN
	value = bswap32(value);
	#endif

	return value;
	}

	static CPUReadMemoryFunc * const pci_reg_read[] = {
	&ppc4xx_pci_reg_read4,
	&ppc4xx_pci_reg_read4,
	&ppc4xx_pci_reg_read4,
	};

	static CPUWriteMemoryFunc * const pci_reg_write[] = {
	&ppc4xx_pci_reg_write4,
	&ppc4xx_pci_reg_write4,
	&ppc4xx_pci_reg_write4,
	};

	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);
	qemu_set_irq(pci_irqs[irq_num], level);
	}

	static void ppc4xx_pci_save(QEMUFile f, void opaque)
	{
	PPC4xxPCIState *controller = opaque;
	int i;

	pci_device_save(controller->pci_dev, f);

	for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
	qemu_put_be32s(f, &controller->pmm[i].la);
	qemu_put_be32s(f, &controller->pmm[i].ma);
	qemu_put_be32s(f, &controller->pmm[i].pcila);
	qemu_put_be32s(f, &controller->pmm[i].pciha);
	}

	for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
	qemu_put_be32s(f, &controller->ptm[i].ms);
	qemu_put_be32s(f, &controller->ptm[i].la);
	}
	}

	static int ppc4xx_pci_load(QEMUFile f, void opaque, int version_id)
	{
	PPC4xxPCIState *controller = opaque;
	int i;

	if (version_id != 1)
	return -EINVAL;

	pci_device_load(controller->pci_dev, f);

	for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
	qemu_get_be32s(f, &controller->pmm[i].la);
	qemu_get_be32s(f, &controller->pmm[i].ma);
	qemu_get_be32s(f, &controller->pmm[i].pcila);
	qemu_get_be32s(f, &controller->pmm[i].pciha);
	}

	for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
	qemu_get_be32s(f, &controller->ptm[i].ms);
	qemu_get_be32s(f, &controller->ptm[i].la);
	}

	return 0;
	}

	/* XXX Interrupt acknowledge cycles not supported. */
	PCIBus ppc4xx_pci_init(CPUState env, qemu_irq pci_irqs[4],
	target_phys_addr_t config_space,
	target_phys_addr_t int_ack,
	target_phys_addr_t special_cycle,
	target_phys_addr_t registers)
	{
	PPC4xxPCIState *controller;
	int index;
	static int ppc4xx_pci_id;
	uint8_t *pci_conf;

	controller = qemu_mallocz(sizeof(PPC4xxPCIState));

	controller->pci_state.bus = pci_register_bus(NULL, "pci",
	ppc4xx_pci_set_irq,
	ppc4xx_pci_map_irq,
	pci_irqs, 0, 4);

	controller->pci_dev = pci_register_device(controller->pci_state.bus,
	"host bridge", sizeof(PCIDevice),
	0, NULL, NULL);
	pci_conf = controller->pci_dev->config;
	pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_IBM);
	pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_IBM_440GX);
	pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);

	/* CFGADDR */
	index = cpu_register_io_memory(pci4xx_cfgaddr_read,
	pci4xx_cfgaddr_write, controller);
	if (index < 0)
	goto free;
	cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);

	/* CFGDATA */
	index = pci_host_data_register_mmio(&controller->pci_state);
	if (index < 0)
	goto free;
	cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);

	/* Internal registers */
	index = cpu_register_io_memory(pci_reg_read, pci_reg_write, controller);
	if (index < 0)
	goto free;
	cpu_register_physical_memory(registers, PCI_REG_SIZE, index);

	qemu_register_reset(ppc4xx_pci_reset, controller);

	/* XXX load/save code not tested. */
	register_savevm("ppc4xx_pci", ppc4xx_pci_id++, 1,
	ppc4xx_pci_save, ppc4xx_pci_load, controller);

	return controller->pci_state.bus;

	free:
	printf("%s error\n", __func__);
	qemu_free(controller);
	return NULL;
	}