arch/x86/pci/ce4100.c - linux - Git at Google

 /*
  *  GPL LICENSE SUMMARY
  *
  *  Copyright(c) 2010 Intel Corporation. All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of version 2 of the GNU General Public License 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, write to the Free Software
  *  Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  *  The full GNU General Public License is included in this distribution
  *  in the file called LICENSE.GPL.
  *
  *  Contact Information:
  *    Intel Corporation
  *    2200 Mission College Blvd.
  *    Santa Clara, CA  97052
  *
  * This provides access methods for PCI registers that mis-behave on
  * the CE4100. Each register can be assigned a private init, read and
  * write routine. The exception to this is the bridge device.  The
  * bridge device is the only device on bus zero (0) that requires any
  * fixup so it is a special case ATM
  */

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/init.h>

 #include <asm/ce4100.h>
 #include <asm/pci_x86.h>

 struct sim_reg {
 	u32 value;
 	u32 mask;
 };

 struct sim_dev_reg {
 	int dev_func;
 	int reg;
 	void (*init)(struct sim_dev_reg *reg);
 	void (*read)(struct sim_dev_reg *reg, u32 *value);
 	void (*write)(struct sim_dev_reg *reg, u32 value);
 	struct sim_reg sim_reg;
 };

 struct sim_reg_op {
 	void (*init)(struct sim_dev_reg *reg);
 	void (*read)(struct sim_dev_reg *reg, u32 value);
 	void (*write)(struct sim_dev_reg *reg, u32 value);
 };

 #define MB (1024 * 1024)
 #define KB (1024)
 #define SIZE_TO_MASK(size) (~(size - 1))

 #define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\
 { PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\
 	{0, SIZE_TO_MASK(size)} },

 static void reg_init(struct sim_dev_reg *reg)
 {
 	pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
 			      &reg->sim_reg.value);
 }

 static void reg_read(struct sim_dev_reg *reg, u32 *value)
 {
 	unsigned long flags;

 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	*value = reg->sim_reg.value;
 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
 }

 static void reg_write(struct sim_dev_reg *reg, u32 value)
 {
 	unsigned long flags;

 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	reg->sim_reg.value = (value & reg->sim_reg.mask) |
 		(reg->sim_reg.value & ~reg->sim_reg.mask);
 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
 }

 static void sata_reg_init(struct sim_dev_reg *reg)
 {
 	pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4,
 			      &reg->sim_reg.value);
 	reg->sim_reg.value += 0x400;
 }

 static void ehci_reg_read(struct sim_dev_reg *reg, u32 *value)
 {
 	reg_read(reg, value);
 	if (*value != reg->sim_reg.mask)
 		*value |= 0x100;
 }

 void sata_revid_init(struct sim_dev_reg *reg)
 {
 	reg->sim_reg.value = 0x01060100;
 	reg->sim_reg.mask = 0;
 }

 static void sata_revid_read(struct sim_dev_reg *reg, u32 *value)
 {
 	reg_read(reg, value);
 }

 static struct sim_dev_reg bus1_fixups[] = {
 	DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write)
 	DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write)
 	DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
 	DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x8,  0, sata_revid_init, sata_revid_read, 0)
 	DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write)
 	DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write)
 	DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write)
 	DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
 	DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write)
 };

 static void __init init_sim_regs(void)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
 		if (bus1_fixups[i].init)
 			bus1_fixups[i].init(&bus1_fixups[i]);
 	}
 }

 static inline void extract_bytes(u32 *value, int reg, int len)
 {
 	uint32_t mask;

 	*value >>= ((reg & 3) * 8);
 	mask = 0xFFFFFFFF >> ((4 - len) * 8);
 	*value &= mask;
 }

 int bridge_read(unsigned int devfn, int reg, int len, u32 *value)
 {
 	u32 av_bridge_base, av_bridge_limit;
 	int retval = 0;

 	switch (reg) {
 	/* Make BARs appear to not request any memory. */
 	case PCI_BASE_ADDRESS_0:
 	case PCI_BASE_ADDRESS_0 + 1:
 	case PCI_BASE_ADDRESS_0 + 2:
 	case PCI_BASE_ADDRESS_0 + 3:
 		*value = 0;
 		break;

 		/* Since subordinate bus number register is hardwired
 		 * to zero and read only, so do the simulation.
 		 */
 	case PCI_PRIMARY_BUS:
 		if (len == 4)
 			*value = 0x00010100;
 		break;

 	case PCI_SUBORDINATE_BUS:
 		*value = 1;
 		break;

 	case PCI_MEMORY_BASE:
 	case PCI_MEMORY_LIMIT:
 		/* Get the A/V bridge base address. */
 		pci_direct_conf1.read(0, 0, devfn,
 				PCI_BASE_ADDRESS_0, 4, &av_bridge_base);

 		av_bridge_limit = av_bridge_base + (512*MB - 1);
 		av_bridge_limit >>= 16;
 		av_bridge_limit &= 0xFFF0;

 		av_bridge_base >>= 16;
 		av_bridge_base &= 0xFFF0;

 		if (reg == PCI_MEMORY_LIMIT)
 			*value = av_bridge_limit;
 		else if (len == 2)
 			*value = av_bridge_base;
 		else
 			*value = (av_bridge_limit << 16) | av_bridge_base;
 		break;
 		/* Make prefetchable memory limit smaller than prefetchable
 		 * memory base, so not claim prefetchable memory space.
 		 */
 	case PCI_PREF_MEMORY_BASE:
 		*value = 0xFFF0;
 		break;
 	case PCI_PREF_MEMORY_LIMIT:
 		*value = 0x0;
 		break;
 		/* Make IO limit smaller than IO base, so not claim IO space. */
 	case PCI_IO_BASE:
 		*value = 0xF0;
 		break;
 	case PCI_IO_LIMIT:
 		*value = 0;
 		break;
 	default:
 		retval = 1;
 	}
 	return retval;
 }

 static int ce4100_conf_read(unsigned int seg, unsigned int bus,
 			    unsigned int devfn, int reg, int len, u32 *value)
 {
 	int i;

 	if (bus == 1) {
 		for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
 			if (bus1_fixups[i].dev_func == devfn &&
 			    bus1_fixups[i].reg == (reg & ~3) &&
 			    bus1_fixups[i].read) {
 				bus1_fixups[i].read(&(bus1_fixups[i]),
 						    value);
 				extract_bytes(value, reg, len);
 				return 0;
 			}
 		}
 	}

 	if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&
 	    !bridge_read(devfn, reg, len, value))
 		return 0;

 	return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);
 }

 static int ce4100_conf_write(unsigned int seg, unsigned int bus,
 			     unsigned int devfn, int reg, int len, u32 value)
 {
 	int i;

 	if (bus == 1) {
 		for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
 			if (bus1_fixups[i].dev_func == devfn &&
 			    bus1_fixups[i].reg == (reg & ~3) &&
 			    bus1_fixups[i].write) {
 				bus1_fixups[i].write(&(bus1_fixups[i]),
 						     value);
 				return 0;
 			}
 		}
 	}

 	/* Discard writes to A/V bridge BAR. */
 	if (bus == 0 && PCI_DEVFN(1, 0) == devfn &&
 	    ((reg & ~3) == PCI_BASE_ADDRESS_0))
 		return 0;

 	return pci_direct_conf1.write(seg, bus, devfn, reg, len, value);
 }

 struct pci_raw_ops ce4100_pci_conf = {
 	.read =	ce4100_conf_read,
 	.write = ce4100_conf_write,
 };

 int __init ce4100_pci_init(void)
 {
 	init_sim_regs();
 	raw_pci_ops = &ce4100_pci_conf;
 	/* Indicate caller that it should invoke pci_legacy_init() */
 	return 1;
 }
	/*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2010 Intel Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License 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, write to the Free Software
	* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	* The full GNU General Public License is included in this distribution
	* in the file called LICENSE.GPL.
	*
	* Contact Information:
	* Intel Corporation
	* 2200 Mission College Blvd.
	* Santa Clara, CA 97052
	*
	* This provides access methods for PCI registers that mis-behave on
	* the CE4100. Each register can be assigned a private init, read and
	* write routine. The exception to this is the bridge device. The
	* bridge device is the only device on bus zero (0) that requires any
	* fixup so it is a special case ATM
	*/

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/init.h>

	#include <asm/ce4100.h>
	#include <asm/pci_x86.h>

	struct sim_reg {
	u32 value;
	u32 mask;
	};

	struct sim_dev_reg {
	int dev_func;
	int reg;
	void (init)(struct sim_dev_reg reg);
	void (read)(struct sim_dev_reg reg, u32 *value);
	void (write)(struct sim_dev_reg reg, u32 value);
	struct sim_reg sim_reg;
	};

	struct sim_reg_op {
	void (init)(struct sim_dev_reg reg);
	void (read)(struct sim_dev_reg reg, u32 value);
	void (write)(struct sim_dev_reg reg, u32 value);
	};

	#define MB (1024 * 1024)
	#define KB (1024)
	#define SIZE_TO_MASK(size) (~(size - 1))

	#define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\
	{ PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\
	{0, SIZE_TO_MASK(size)} },

	static void reg_init(struct sim_dev_reg *reg)
	{
	pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
	&reg->sim_reg.value);
	}

	static void reg_read(struct sim_dev_reg reg, u32 value)
	{
	unsigned long flags;

	raw_spin_lock_irqsave(&pci_config_lock, flags);
	*value = reg->sim_reg.value;
	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
	}

	static void reg_write(struct sim_dev_reg *reg, u32 value)
	{
	unsigned long flags;

	raw_spin_lock_irqsave(&pci_config_lock, flags);
	reg->sim_reg.value = (value & reg->sim_reg.mask) \|
	(reg->sim_reg.value & ~reg->sim_reg.mask);
	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
	}

	static void sata_reg_init(struct sim_dev_reg *reg)
	{
	pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4,
	&reg->sim_reg.value);
	reg->sim_reg.value += 0x400;
	}

	static void ehci_reg_read(struct sim_dev_reg reg, u32 value)
	{
	reg_read(reg, value);
	if (*value != reg->sim_reg.mask)
	*value \|= 0x100;
	}

	void sata_revid_init(struct sim_dev_reg *reg)
	{
	reg->sim_reg.value = 0x01060100;
	reg->sim_reg.mask = 0;
	}

	static void sata_revid_read(struct sim_dev_reg reg, u32 value)
	{
	reg_read(reg, value);
	}

	static struct sim_dev_reg bus1_fixups[] = {
	DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write)
	DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write)
	DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
	DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write)
	DEFINE_REG(14, 0, 0x8, 0, sata_revid_init, sata_revid_read, 0)
	DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write)
	DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write)
	DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write)
	DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write)
	DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write)
	DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write)
	DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write)
	DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write)
	DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write)
	};

	static void __init init_sim_regs(void)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
	if (bus1_fixups[i].init)
	bus1_fixups[i].init(&bus1_fixups[i]);
	}
	}

	static inline void extract_bytes(u32 *value, int reg, int len)
	{
	uint32_t mask;

	value >>= ((reg & 3) 8);
	mask = 0xFFFFFFFF >> ((4 - len) * 8);
	*value &= mask;
	}

	int bridge_read(unsigned int devfn, int reg, int len, u32 *value)
	{
	u32 av_bridge_base, av_bridge_limit;
	int retval = 0;

	switch (reg) {
	/* Make BARs appear to not request any memory. */
	case PCI_BASE_ADDRESS_0:
	case PCI_BASE_ADDRESS_0 + 1:
	case PCI_BASE_ADDRESS_0 + 2:
	case PCI_BASE_ADDRESS_0 + 3:
	*value = 0;
	break;

	/* Since subordinate bus number register is hardwired
	* to zero and read only, so do the simulation.
	*/
	case PCI_PRIMARY_BUS:
	if (len == 4)
	*value = 0x00010100;
	break;

	case PCI_SUBORDINATE_BUS:
	*value = 1;
	break;

	case PCI_MEMORY_BASE:
	case PCI_MEMORY_LIMIT:
	/* Get the A/V bridge base address. */
	pci_direct_conf1.read(0, 0, devfn,
	PCI_BASE_ADDRESS_0, 4, &av_bridge_base);

	av_bridge_limit = av_bridge_base + (512*MB - 1);
	av_bridge_limit >>= 16;
	av_bridge_limit &= 0xFFF0;

	av_bridge_base >>= 16;
	av_bridge_base &= 0xFFF0;

	if (reg == PCI_MEMORY_LIMIT)
	*value = av_bridge_limit;
	else if (len == 2)
	*value = av_bridge_base;
	else
	*value = (av_bridge_limit << 16) \| av_bridge_base;
	break;
	/* Make prefetchable memory limit smaller than prefetchable
	* memory base, so not claim prefetchable memory space.
	*/
	case PCI_PREF_MEMORY_BASE:
	*value = 0xFFF0;
	break;
	case PCI_PREF_MEMORY_LIMIT:
	*value = 0x0;
	break;
	/* Make IO limit smaller than IO base, so not claim IO space. */
	case PCI_IO_BASE:
	*value = 0xF0;
	break;
	case PCI_IO_LIMIT:
	*value = 0;
	break;
	default:
	retval = 1;
	}
	return retval;
	}

	static int ce4100_conf_read(unsigned int seg, unsigned int bus,
	unsigned int devfn, int reg, int len, u32 *value)
	{
	int i;

	if (bus == 1) {
	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
	if (bus1_fixups[i].dev_func == devfn &&
	bus1_fixups[i].reg == (reg & ~3) &&
	bus1_fixups[i].read) {
	bus1_fixups[i].read(&(bus1_fixups[i]),
	value);
	extract_bytes(value, reg, len);
	return 0;
	}
	}
	}

	if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&
	!bridge_read(devfn, reg, len, value))
	return 0;

	return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);
	}

	static int ce4100_conf_write(unsigned int seg, unsigned int bus,
	unsigned int devfn, int reg, int len, u32 value)
	{
	int i;

	if (bus == 1) {
	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {
	if (bus1_fixups[i].dev_func == devfn &&
	bus1_fixups[i].reg == (reg & ~3) &&
	bus1_fixups[i].write) {
	bus1_fixups[i].write(&(bus1_fixups[i]),
	value);
	return 0;
	}
	}
	}

	/* Discard writes to A/V bridge BAR. */
	if (bus == 0 && PCI_DEVFN(1, 0) == devfn &&
	((reg & ~3) == PCI_BASE_ADDRESS_0))
	return 0;

	return pci_direct_conf1.write(seg, bus, devfn, reg, len, value);
	}

	struct pci_raw_ops ce4100_pci_conf = {
	.read = ce4100_conf_read,
	.write = ce4100_conf_write,
	};

	int __init ce4100_pci_init(void)
	{
	init_sim_regs();
	raw_pci_ops = &ce4100_pci_conf;
	/* Indicate caller that it should invoke pci_legacy_init() */
	return 1;
	}