arch/arm/plat-iop/pci.c - linux - Git at Google

 /*
  * arch/arm/plat-iop/pci.c
  *
  * PCI support for the Intel IOP32X and IOP33X processors
  *
  * Author: Rory Bolt <rorybolt@pacbell.net>
  * Copyright (C) 2002 Rory Bolt
  *
  * 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.
  */

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/signal.h>
 #include <asm/system.h>
 #include <asm/hardware.h>
 #include <asm/mach/pci.h>
 #include <asm/hardware/iop3xx.h>

 // #define DEBUG

 #ifdef DEBUG
 #define  DBG(x...) printk(x)
 #else
 #define  DBG(x...) do { } while (0)
 #endif

 /*
  * This routine builds either a type0 or type1 configuration command.  If the
  * bus is on the 803xx then a type0 made, else a type1 is created.
  */
 static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
 {
 	struct pci_sys_data *sys = bus->sysdata;
 	u32 addr;

 	if (sys->busnr == bus->number)
 		addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
 	else
 		addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;

 	addr |=	PCI_FUNC(devfn) << 8 | (where & ~3);

 	return addr;
 }

 /*
  * This routine checks the status of the last configuration cycle.  If an error
  * was detected it returns a 1, else it returns a 0.  The errors being checked
  * are parity, master abort, target abort (master and target).  These types of
  * errors occur during a config cycle where there is no device, like during
  * the discovery stage.
  */
 static int iop3xx_pci_status(void)
 {
 	unsigned int status;
 	int ret = 0;

 	/*
 	 * Check the status registers.
 	 */
 	status = *IOP3XX_ATUSR;
 	if (status & 0xf900) {
 		DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
 		*IOP3XX_ATUSR = status & 0xf900;
 		ret = 1;
 	}

 	status = *IOP3XX_ATUISR;
 	if (status & 0x679f) {
 		DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
 		*IOP3XX_ATUISR = status & 0x679f;
 		ret = 1;
 	}

 	return ret;
 }

 /*
  * Simply write the address register and read the configuration
  * data.  Note that the 4 nop's ensure that we are able to handle
  * a delayed abort (in theory.)
  */
 static inline u32 iop3xx_read(unsigned long addr)
 {
 	u32 val;

 	__asm__ __volatile__(
 		"str	%1, [%2]\n\t"
 		"ldr	%0, [%3]\n\t"
 		"nop\n\t"
 		"nop\n\t"
 		"nop\n\t"
 		"nop\n\t"
 		: "=r" (val)
 		: "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));

 	return val;
 }

 /*
  * The read routines must check the error status of the last configuration
  * cycle.  If there was an error, the routine returns all hex f's.
  */
 static int
 iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		int size, u32 *value)
 {
 	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
 	u32 val = iop3xx_read(addr) >> ((where & 3) * 8);

 	if (iop3xx_pci_status())
 		val = 0xffffffff;

 	*value = val;

 	return PCIBIOS_SUCCESSFUL;
 }

 static int
 iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		int size, u32 value)
 {
 	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
 	u32 val;

 	if (size != 4) {
 		val = iop3xx_read(addr);
 		if (iop3xx_pci_status())
 			return PCIBIOS_SUCCESSFUL;

 		where = (where & 3) * 8;

 		if (size == 1)
 			val &= ~(0xff << where);
 		else
 			val &= ~(0xffff << where);

 		*IOP3XX_OCCDR = val | value << where;
 	} else {
 		asm volatile(
 			"str	%1, [%2]\n\t"
 			"str	%0, [%3]\n\t"
 			"nop\n\t"
 			"nop\n\t"
 			"nop\n\t"
 			"nop\n\t"
 			:
 			: "r" (value), "r" (addr),
 			  "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops iop3xx_ops = {
 	.read	= iop3xx_read_config,
 	.write	= iop3xx_write_config,
 };

 /*
  * When a PCI device does not exist during config cycles, the 80200 gets a
  * bus error instead of returning 0xffffffff. This handler simply returns.
  */
 static int
 iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 {
 	DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
 		addr, fsr, regs->ARM_pc, regs->ARM_lr);

 	/*
 	 * If it was an imprecise abort, then we need to correct the
 	 * return address to be _after_ the instruction.
 	 */
 	if (fsr & (1 << 10))
 		regs->ARM_pc += 4;

 	return 0;
 }

 int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
 {
 	struct resource *res;

 	if (nr != 0)
 		return 0;

 	res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
 	if (!res)
 		panic("PCI: unable to alloc resources");

 	res[0].start = IOP3XX_PCI_LOWER_IO_PA;
 	res[0].end   = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
 	res[0].name  = "IOP3XX PCI I/O Space";
 	res[0].flags = IORESOURCE_IO;
 	request_resource(&ioport_resource, &res[0]);

 	res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
 	res[1].end   = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
 	res[1].name  = "IOP3XX PCI Memory Space";
 	res[1].flags = IORESOURCE_MEM;
 	request_resource(&iomem_resource, &res[1]);

 	sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
 	sys->io_offset  = IOP3XX_PCI_LOWER_IO_PA - IOP3XX_PCI_LOWER_IO_BA;

 	sys->resource[0] = &res[0];
 	sys->resource[1] = &res[1];
 	sys->resource[2] = NULL;

 	return 1;
 }

 struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
 {
 	return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
 }

 void __init iop3xx_atu_setup(void)
 {
 	/* BAR 0 ( Disabled ) */
 	*IOP3XX_IAUBAR0 = 0x0;
 	*IOP3XX_IABAR0  = 0x0;
 	*IOP3XX_IATVR0  = 0x0;
 	*IOP3XX_IALR0   = 0x0;

 	/* BAR 1 ( Disabled ) */
 	*IOP3XX_IAUBAR1 = 0x0;
 	*IOP3XX_IABAR1  = 0x0;
 	*IOP3XX_IALR1   = 0x0;

 	/* BAR 2 (1:1 mapping with Physical RAM) */
 	/* Set limit and enable */
 	*IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
 	*IOP3XX_IAUBAR2 = 0x0;

 	/* Align the inbound bar with the base of memory */
 	*IOP3XX_IABAR2 = PHYS_OFFSET |
 			       PCI_BASE_ADDRESS_MEM_TYPE_64 |
 			       PCI_BASE_ADDRESS_MEM_PREFETCH;

 	*IOP3XX_IATVR2 = PHYS_OFFSET;

 	/* Outbound window 0 */
 	*IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
 	*IOP3XX_OUMWTVR0 = 0;

 	/* Outbound window 1 */
 	*IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
 	*IOP3XX_OUMWTVR1 = 0;

 	/* BAR 3 ( Disabled ) */
 	*IOP3XX_IAUBAR3 = 0x0;
 	*IOP3XX_IABAR3  = 0x0;
 	*IOP3XX_IATVR3  = 0x0;
 	*IOP3XX_IALR3   = 0x0;

 	/* Setup the I/O Bar
 	 */
 	*IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;

 	/* Enable inbound and outbound cycles
 	 */
 	*IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 			       PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
 	*IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
 }

 void __init iop3xx_atu_disable(void)
 {
 	*IOP3XX_ATUCMD = 0;
 	*IOP3XX_ATUCR = 0;

 	/* wait for cycles to quiesce */
 	while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
 				     IOP3XX_PCSR_IN_Q_BUSY))
 		cpu_relax();

 	/* BAR 0 ( Disabled ) */
 	*IOP3XX_IAUBAR0 = 0x0;
 	*IOP3XX_IABAR0  = 0x0;
 	*IOP3XX_IATVR0  = 0x0;
 	*IOP3XX_IALR0   = 0x0;

 	/* BAR 1 ( Disabled ) */
 	*IOP3XX_IAUBAR1 = 0x0;
 	*IOP3XX_IABAR1  = 0x0;
 	*IOP3XX_IALR1   = 0x0;

 	/* BAR 2 ( Disabled ) */
 	*IOP3XX_IAUBAR2 = 0x0;
 	*IOP3XX_IABAR2  = 0x0;
 	*IOP3XX_IATVR2  = 0x0;
 	*IOP3XX_IALR2   = 0x0;

 	/* BAR 3 ( Disabled ) */
 	*IOP3XX_IAUBAR3 = 0x0;
 	*IOP3XX_IABAR3  = 0x0;
 	*IOP3XX_IATVR3  = 0x0;
 	*IOP3XX_IALR3   = 0x0;

 	/* Clear the outbound windows */
 	*IOP3XX_OIOWTVR  = 0;

 	/* Outbound window 0 */
 	*IOP3XX_OMWTVR0 = 0;
 	*IOP3XX_OUMWTVR0 = 0;

 	/* Outbound window 1 */
 	*IOP3XX_OMWTVR1 = 0;
 	*IOP3XX_OUMWTVR1 = 0;
 }

 /* Flag to determine whether the ATU is initialized and the PCI bus scanned */
 int init_atu;

 void iop3xx_pci_preinit(void)
 {
 	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
 		iop3xx_atu_disable();
 		iop3xx_atu_setup();
 	}

 	DBG("PCI:  Intel 803xx PCI init code.\n");
 	DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
 	DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
 			*IOP3XX_OMWTVR0,
 			*IOP3XX_OIOWTVR);
 	DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
 	DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
 			*IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
 	DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
 	DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
 			*IOP3XX_IABAR1, *IOP3XX_IALR1);
 	DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
 			*IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
 	DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
 			*IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
 	DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
 			*IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);

 	hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
 }

 /* allow init_atu to be user overridden */
 static int __init iop3xx_init_atu_setup(char *str)
 {
 	init_atu = IOP3XX_INIT_ATU_DEFAULT;
 	if (str) {
 		while (*str != '\0') {
 			switch (*str) {
 			case 'y':
 			case 'Y':
 				init_atu = IOP3XX_INIT_ATU_ENABLE;
 				break;
 			case 'n':
 			case 'N':
 				init_atu = IOP3XX_INIT_ATU_DISABLE;
 				break;
 			case ',':
 			case '=':
 				break;
 			default:
 				printk(KERN_DEBUG "\"%s\" malformed at "
 					    "character: \'%c\'",
 					    __FUNCTION__,
 					    *str);
 				*(str + 1) = '\0';
 			}
 			str++;
 		}
 	}

 	return 1;
 }

 __setup("iop3xx_init_atu", iop3xx_init_atu_setup);
	/*
	* arch/arm/plat-iop/pci.c
	*
	* PCI support for the Intel IOP32X and IOP33X processors
	*
	* Author: Rory Bolt <rorybolt@pacbell.net>
	* Copyright (C) 2002 Rory Bolt
	*
	* 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.
	*/

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/mm.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/signal.h>
	#include <asm/system.h>
	#include <asm/hardware.h>
	#include <asm/mach/pci.h>
	#include <asm/hardware/iop3xx.h>

	// #define DEBUG

	#ifdef DEBUG
	#define DBG(x...) printk(x)
	#else
	#define DBG(x...) do { } while (0)
	#endif

	/*
	* This routine builds either a type0 or type1 configuration command. If the
	* bus is on the 803xx then a type0 made, else a type1 is created.
	*/
	static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
	{
	struct pci_sys_data *sys = bus->sysdata;
	u32 addr;

	if (sys->busnr == bus->number)
	addr = 1 << (PCI_SLOT(devfn) + 16) \| (PCI_SLOT(devfn) << 11);
	else
	addr = bus->number << 16 \| PCI_SLOT(devfn) << 11 \| 1;

	addr \|= PCI_FUNC(devfn) << 8 \| (where & ~3);

	return addr;
	}

	/*
	* This routine checks the status of the last configuration cycle. If an error
	* was detected it returns a 1, else it returns a 0. The errors being checked
	* are parity, master abort, target abort (master and target). These types of
	* errors occur during a config cycle where there is no device, like during
	* the discovery stage.
	*/
	static int iop3xx_pci_status(void)
	{
	unsigned int status;
	int ret = 0;

	/*
	* Check the status registers.
	*/
	status = *IOP3XX_ATUSR;
	if (status & 0xf900) {
	DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
	*IOP3XX_ATUSR = status & 0xf900;
	ret = 1;
	}

	status = *IOP3XX_ATUISR;
	if (status & 0x679f) {
	DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
	*IOP3XX_ATUISR = status & 0x679f;
	ret = 1;
	}

	return ret;
	}

	/*
	* Simply write the address register and read the configuration
	* data. Note that the 4 nop's ensure that we are able to handle
	* a delayed abort (in theory.)
	*/
	static inline u32 iop3xx_read(unsigned long addr)
	{
	u32 val;

	__asm__ __volatile__(
	"str %1, [%2]\n\t"
	"ldr %0, [%3]\n\t"
	"nop\n\t"
	"nop\n\t"
	"nop\n\t"
	"nop\n\t"
	: "=r" (val)
	: "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));

	return val;
	}

	/*
	* The read routines must check the error status of the last configuration
	* cycle. If there was an error, the routine returns all hex f's.
	*/
	static int
	iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 *value)
	{
	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
	u32 val = iop3xx_read(addr) >> ((where & 3) * 8);

	if (iop3xx_pci_status())
	val = 0xffffffff;

	*value = val;

	return PCIBIOS_SUCCESSFUL;
	}

	static int
	iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 value)
	{
	unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
	u32 val;

	if (size != 4) {
	val = iop3xx_read(addr);
	if (iop3xx_pci_status())
	return PCIBIOS_SUCCESSFUL;

	where = (where & 3) * 8;

	if (size == 1)
	val &= ~(0xff << where);
	else
	val &= ~(0xffff << where);

	*IOP3XX_OCCDR = val \| value << where;
	} else {
	asm volatile(
	"str %1, [%2]\n\t"
	"str %0, [%3]\n\t"
	"nop\n\t"
	"nop\n\t"
	"nop\n\t"
	"nop\n\t"
	:
	: "r" (value), "r" (addr),
	"r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops iop3xx_ops = {
	.read = iop3xx_read_config,
	.write = iop3xx_write_config,
	};

	/*
	* When a PCI device does not exist during config cycles, the 80200 gets a
	* bus error instead of returning 0xffffffff. This handler simply returns.
	*/
	static int
	iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
	{
	DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
	addr, fsr, regs->ARM_pc, regs->ARM_lr);

	/*
	* If it was an imprecise abort, then we need to correct the
	* return address to be _after_ the instruction.
	*/
	if (fsr & (1 << 10))
	regs->ARM_pc += 4;

	return 0;
	}

	int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
	{
	struct resource *res;

	if (nr != 0)
	return 0;

	res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
	if (!res)
	panic("PCI: unable to alloc resources");

	res[0].start = IOP3XX_PCI_LOWER_IO_PA;
	res[0].end = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
	res[0].name = "IOP3XX PCI I/O Space";
	res[0].flags = IORESOURCE_IO;
	request_resource(&ioport_resource, &res[0]);

	res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
	res[1].end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
	res[1].name = "IOP3XX PCI Memory Space";
	res[1].flags = IORESOURCE_MEM;
	request_resource(&iomem_resource, &res[1]);

	sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
	sys->io_offset = IOP3XX_PCI_LOWER_IO_PA - IOP3XX_PCI_LOWER_IO_BA;

	sys->resource[0] = &res[0];
	sys->resource[1] = &res[1];
	sys->resource[2] = NULL;

	return 1;
	}

	struct pci_bus iop3xx_pci_scan_bus(int nr, struct pci_sys_data sys)
	{
	return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
	}

	void __init iop3xx_atu_setup(void)
	{
	/* BAR 0 ( Disabled ) */
	*IOP3XX_IAUBAR0 = 0x0;
	*IOP3XX_IABAR0 = 0x0;
	*IOP3XX_IATVR0 = 0x0;
	*IOP3XX_IALR0 = 0x0;

	/* BAR 1 ( Disabled ) */
	*IOP3XX_IAUBAR1 = 0x0;
	*IOP3XX_IABAR1 = 0x0;
	*IOP3XX_IALR1 = 0x0;

	/* BAR 2 (1:1 mapping with Physical RAM) */
	/* Set limit and enable */
	*IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
	*IOP3XX_IAUBAR2 = 0x0;

	/* Align the inbound bar with the base of memory */
	*IOP3XX_IABAR2 = PHYS_OFFSET \|
	PCI_BASE_ADDRESS_MEM_TYPE_64 \|
	PCI_BASE_ADDRESS_MEM_PREFETCH;

	*IOP3XX_IATVR2 = PHYS_OFFSET;

	/* Outbound window 0 */
	*IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
	*IOP3XX_OUMWTVR0 = 0;

	/* Outbound window 1 */
	*IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
	*IOP3XX_OUMWTVR1 = 0;

	/* BAR 3 ( Disabled ) */
	*IOP3XX_IAUBAR3 = 0x0;
	*IOP3XX_IABAR3 = 0x0;
	*IOP3XX_IATVR3 = 0x0;
	*IOP3XX_IALR3 = 0x0;

	/* Setup the I/O Bar
	*/
	*IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;

	/* Enable inbound and outbound cycles
	*/
	*IOP3XX_ATUCMD \|= PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER \|
	PCI_COMMAND_PARITY \| PCI_COMMAND_SERR;
	*IOP3XX_ATUCR \|= IOP3XX_ATUCR_OUT_EN;
	}

	void __init iop3xx_atu_disable(void)
	{
	*IOP3XX_ATUCMD = 0;
	*IOP3XX_ATUCR = 0;

	/* wait for cycles to quiesce */
	while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY \|
	IOP3XX_PCSR_IN_Q_BUSY))
	cpu_relax();

	/* BAR 0 ( Disabled ) */
	*IOP3XX_IAUBAR0 = 0x0;
	*IOP3XX_IABAR0 = 0x0;
	*IOP3XX_IATVR0 = 0x0;
	*IOP3XX_IALR0 = 0x0;

	/* BAR 1 ( Disabled ) */
	*IOP3XX_IAUBAR1 = 0x0;
	*IOP3XX_IABAR1 = 0x0;
	*IOP3XX_IALR1 = 0x0;

	/* BAR 2 ( Disabled ) */
	*IOP3XX_IAUBAR2 = 0x0;
	*IOP3XX_IABAR2 = 0x0;
	*IOP3XX_IATVR2 = 0x0;
	*IOP3XX_IALR2 = 0x0;

	/* BAR 3 ( Disabled ) */
	*IOP3XX_IAUBAR3 = 0x0;
	*IOP3XX_IABAR3 = 0x0;
	*IOP3XX_IATVR3 = 0x0;
	*IOP3XX_IALR3 = 0x0;

	/* Clear the outbound windows */
	*IOP3XX_OIOWTVR = 0;

	/* Outbound window 0 */
	*IOP3XX_OMWTVR0 = 0;
	*IOP3XX_OUMWTVR0 = 0;

	/* Outbound window 1 */
	*IOP3XX_OMWTVR1 = 0;
	*IOP3XX_OUMWTVR1 = 0;
	}

	/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
	int init_atu;

	void iop3xx_pci_preinit(void)
	{
	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
	iop3xx_atu_disable();
	iop3xx_atu_setup();
	}

	DBG("PCI: Intel 803xx PCI init code.\n");
	DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
	DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
	*IOP3XX_OMWTVR0,
	*IOP3XX_OIOWTVR);
	DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
	DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
	IOP3XX_IABAR0, IOP3XX_IALR0, *IOP3XX_IATVR0);
	DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
	DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
	IOP3XX_IABAR1, IOP3XX_IALR1);
	DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
	IOP3XX_ERBAR, IOP3XX_ERLR, *IOP3XX_ERTVR);
	DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
	IOP3XX_IABAR2, IOP3XX_IALR2, *IOP3XX_IATVR2);
	DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
	IOP3XX_IABAR3, IOP3XX_IALR3, *IOP3XX_IATVR3);

	hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
	}

	/* allow init_atu to be user overridden */
	static int __init iop3xx_init_atu_setup(char *str)
	{
	init_atu = IOP3XX_INIT_ATU_DEFAULT;
	if (str) {
	while (*str != '\0') {
	switch (*str) {
	case 'y':
	case 'Y':
	init_atu = IOP3XX_INIT_ATU_ENABLE;
	break;
	case 'n':
	case 'N':
	init_atu = IOP3XX_INIT_ATU_DISABLE;
	break;
	case ',':
	case '=':
	break;
	default:
	printk(KERN_DEBUG "\"%s\" malformed at "
	"character: \'%c\'",
	__FUNCTION__,
	*str);
	*(str + 1) = '\0';
	}
	str++;
	}
	}

	return 1;
	}

	__setup("iop3xx_init_atu", iop3xx_init_atu_setup);