arch/arm/mach-footbridge/dc21285.c - maze/linux - Git at Google

 /*
  *  linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
  *
  *  Copyright (C) 1998-2001 Russell King
  *  Copyright (C) 1998-2000 Phil Blundell
  *
  * 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/interrupt.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/spinlock.h>
 #include <video/vga.h>

 #include <asm/irq.h>
 #include <asm/mach/pci.h>
 #include <asm/hardware/dec21285.h>

 #define MAX_SLOTS		21

 #define PCICMD_ABORT		((PCI_STATUS_REC_MASTER_ABORT| \
 				  PCI_STATUS_REC_TARGET_ABORT)<<16)

 #define PCICMD_ERROR_BITS	((PCI_STATUS_DETECTED_PARITY | \
 				  PCI_STATUS_REC_MASTER_ABORT | \
 				  PCI_STATUS_REC_TARGET_ABORT | \
 				  PCI_STATUS_PARITY) << 16)

 extern int setup_arm_irq(int, struct irqaction *);
 extern void pcibios_report_status(u_int status_mask, int warn);

 static unsigned long
 dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
 {
 	unsigned long addr = 0;

 	if (bus->number == 0) {
 		if (PCI_SLOT(devfn) == 0)
 			/*
 			 * For devfn 0, point at the 21285
 			 */
 			addr = ARMCSR_BASE;
 		else {
 			devfn -= 1 << 3;

 			if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
 				addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
 		}
 	} else
 		addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);

 	return addr;
 }

 static int
 dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		    int size, u32 *value)
 {
 	unsigned long addr = dc21285_base_address(bus, devfn);
 	u32 v = 0xffffffff;

 	if (addr)
 		switch (size) {
 		case 1:
 			asm("ldrb	%0, [%1, %2]"
 				: "=r" (v) : "r" (addr), "r" (where) : "cc");
 			break;
 		case 2:
 			asm("ldrh	%0, [%1, %2]"
 				: "=r" (v) : "r" (addr), "r" (where) : "cc");
 			break;
 		case 4:
 			asm("ldr	%0, [%1, %2]"
 				: "=r" (v) : "r" (addr), "r" (where) : "cc");
 			break;
 		}

 	*value = v;

 	v = *CSR_PCICMD;
 	if (v & PCICMD_ABORT) {
 		*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
 		return -1;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static int
 dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		     int size, u32 value)
 {
 	unsigned long addr = dc21285_base_address(bus, devfn);
 	u32 v;

 	if (addr)
 		switch (size) {
 		case 1:
 			asm("strb	%0, [%1, %2]"
 				: : "r" (value), "r" (addr), "r" (where)
 				: "cc");
 			break;
 		case 2:
 			asm("strh	%0, [%1, %2]"
 				: : "r" (value), "r" (addr), "r" (where)
 				: "cc");
 			break;
 		case 4:
 			asm("str	%0, [%1, %2]"
 				: : "r" (value), "r" (addr), "r" (where)
 				: "cc");
 			break;
 		}

 	v = *CSR_PCICMD;
 	if (v & PCICMD_ABORT) {
 		*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
 		return -1;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 struct pci_ops dc21285_ops = {
 	.read	= dc21285_read_config,
 	.write	= dc21285_write_config,
 };

 static struct timer_list serr_timer;
 static struct timer_list perr_timer;

 static void dc21285_enable_error(unsigned long __data)
 {
 	switch (__data) {
 	case IRQ_PCI_SERR:
 		del_timer(&serr_timer);
 		break;

 	case IRQ_PCI_PERR:
 		del_timer(&perr_timer);
 		break;
 	}

 	enable_irq(__data);
 }

 /*
  * Warn on PCI errors.
  */
 static irqreturn_t dc21285_abort_irq(int irq, void *dev_id)
 {
 	unsigned int cmd;
 	unsigned int status;

 	cmd = *CSR_PCICMD;
 	status = cmd >> 16;
 	cmd = cmd & 0xffff;

 	if (status & PCI_STATUS_REC_MASTER_ABORT) {
 		printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
 			instruction_pointer(get_irq_regs()));
 		cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
 	}

 	if (status & PCI_STATUS_REC_TARGET_ABORT) {
 		printk(KERN_DEBUG "PCI: target abort: ");
 		pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
 				      PCI_STATUS_SIG_TARGET_ABORT |
 				      PCI_STATUS_REC_TARGET_ABORT, 1);
 		printk("\n");

 		cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
 	}

 	*CSR_PCICMD = cmd;

 	return IRQ_HANDLED;
 }

 static irqreturn_t dc21285_serr_irq(int irq, void *dev_id)
 {
 	struct timer_list *timer = dev_id;
 	unsigned int cntl;

 	printk(KERN_DEBUG "PCI: system error received: ");
 	pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
 	printk("\n");

 	cntl = *CSR_SA110_CNTL & 0xffffdf07;
 	*CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;

 	/*
 	 * back off this interrupt
 	 */
 	disable_irq(irq);
 	timer->expires = jiffies + HZ;
 	add_timer(timer);

 	return IRQ_HANDLED;
 }

 static irqreturn_t dc21285_discard_irq(int irq, void *dev_id)
 {
 	printk(KERN_DEBUG "PCI: discard timer expired\n");
 	*CSR_SA110_CNTL &= 0xffffde07;

 	return IRQ_HANDLED;
 }

 static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id)
 {
 	unsigned int cmd;

 	printk(KERN_DEBUG "PCI: data parity error detected: ");
 	pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 	printk("\n");

 	cmd = *CSR_PCICMD & 0xffff;
 	*CSR_PCICMD = cmd | 1 << 24;

 	return IRQ_HANDLED;
 }

 static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
 {
 	struct timer_list *timer = dev_id;
 	unsigned int cmd;

 	printk(KERN_DEBUG "PCI: parity error detected: ");
 	pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 	printk("\n");

 	cmd = *CSR_PCICMD & 0xffff;
 	*CSR_PCICMD = cmd | 1 << 31;

 	/*
 	 * back off this interrupt
 	 */
 	disable_irq(irq);
 	timer->expires = jiffies + HZ;
 	add_timer(timer);

 	return IRQ_HANDLED;
 }

 int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 {
 	struct resource *res;

 	if (nr || !footbridge_cfn_mode())
 		return 0;

 	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 	if (!res) {
 		printk("out of memory for root bus resources");
 		return 0;
 	}

 	res[0].flags = IORESOURCE_MEM;
 	res[0].name  = "Footbridge non-prefetch";
 	res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 	res[1].name  = "Footbridge prefetch";

 	allocate_resource(&iomem_resource, &res[1], 0x20000000,
 			  0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
 	allocate_resource(&iomem_resource, &res[0], 0x40000000,
 			  0x80000000, 0xffffffff, 0x40000000, NULL, NULL);

 	sys->mem_offset  = DC21285_PCI_MEM;

 	pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
 	pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);

 	return 1;
 }

 #define dc21285_request_irq(_a, _b, _c, _d, _e) \
 	WARN_ON(request_irq(_a, _b, _c, _d, _e) < 0)

 void __init dc21285_preinit(void)
 {
 	unsigned int mem_size, mem_mask;
 	int cfn_mode;

 	pcibios_min_mem = 0x81000000;
 	vga_base = PCIMEM_BASE;

 	mem_size = (unsigned int)high_memory - PAGE_OFFSET;
 	for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
 		if (mem_mask >= mem_size)
 			break;

 	/*
 	 * These registers need to be set up whether we're the
 	 * central function or not.
 	 */
 	*CSR_SDRAMBASEMASK    = (mem_mask - 1) & 0x0ffc0000;
 	*CSR_SDRAMBASEOFFSET  = 0;
 	*CSR_ROMBASEMASK      = 0x80000000;
 	*CSR_CSRBASEMASK      = 0;
 	*CSR_CSRBASEOFFSET    = 0;
 	*CSR_PCIADDR_EXTN     = 0;

 	cfn_mode = __footbridge_cfn_mode();

 	printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
 		"%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
 		"central function" : "addin");

 	if (footbridge_cfn_mode()) {
 		/*
 		 * Clear any existing errors - we aren't
 		 * interested in historical data...
 		 */
 		*CSR_SA110_CNTL	= (*CSR_SA110_CNTL & 0xffffde07) |
 				  SA110_CNTL_RXSERR;
 		*CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
 	}

 	init_timer(&serr_timer);
 	init_timer(&perr_timer);

 	serr_timer.data = IRQ_PCI_SERR;
 	serr_timer.function = dc21285_enable_error;
 	perr_timer.data = IRQ_PCI_PERR;
 	perr_timer.function = dc21285_enable_error;

 	/*
 	 * We don't care if these fail.
 	 */
 	dc21285_request_irq(IRQ_PCI_SERR, dc21285_serr_irq, IRQF_DISABLED,
 			    "PCI system error", &serr_timer);
 	dc21285_request_irq(IRQ_PCI_PERR, dc21285_parity_irq, IRQF_DISABLED,
 			    "PCI parity error", &perr_timer);
 	dc21285_request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, IRQF_DISABLED,
 			    "PCI abort", NULL);
 	dc21285_request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, IRQF_DISABLED,
 			    "Discard timer", NULL);
 	dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, IRQF_DISABLED,
 			    "PCI data parity", NULL);

 	if (cfn_mode) {
 		/*
 		 * Map our SDRAM at a known address in PCI space, just in case
 		 * the firmware had other ideas.  Using a nonzero base is
 		 * necessary, since some VGA cards forcefully use PCI addresses
 		 * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
 		 */
 		*CSR_PCICSRBASE       = 0xf4000000;
 		*CSR_PCICSRIOBASE     = 0;
 		*CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
 		*CSR_PCIROMBASE       = 0;
 		*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 			      PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
 	} else if (footbridge_cfn_mode() != 0) {
 		/*
 		 * If we are not compiled to accept "add-in" mode, then
 		 * we are using a constant virt_to_bus translation which
 		 * can not hope to cater for the way the host BIOS  has
 		 * set up the machine.
 		 */
 		panic("PCI: this kernel is compiled for central "
 			"function mode only");
 	}
 }

 void __init dc21285_postinit(void)
 {
 	register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
 }
	/*
	* linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
	*
	* Copyright (C) 1998-2001 Russell King
	* Copyright (C) 1998-2000 Phil Blundell
	*
	* 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/interrupt.h>
	#include <linux/mm.h>
	#include <linux/slab.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/spinlock.h>
	#include <video/vga.h>

	#include <asm/irq.h>
	#include <asm/mach/pci.h>
	#include <asm/hardware/dec21285.h>

	#define MAX_SLOTS 21

	#define PCICMD_ABORT ((PCI_STATUS_REC_MASTER_ABORT\| \
	PCI_STATUS_REC_TARGET_ABORT)<<16)

	#define PCICMD_ERROR_BITS ((PCI_STATUS_DETECTED_PARITY \| \
	PCI_STATUS_REC_MASTER_ABORT \| \
	PCI_STATUS_REC_TARGET_ABORT \| \
	PCI_STATUS_PARITY) << 16)

	extern int setup_arm_irq(int, struct irqaction *);
	extern void pcibios_report_status(u_int status_mask, int warn);

	static unsigned long
	dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
	{
	unsigned long addr = 0;

	if (bus->number == 0) {
	if (PCI_SLOT(devfn) == 0)
	/*
	* For devfn 0, point at the 21285
	*/
	addr = ARMCSR_BASE;
	else {
	devfn -= 1 << 3;

	if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
	addr = PCICFG0_BASE \| 0xc00000 \| (devfn << 8);
	}
	} else
	addr = PCICFG1_BASE \| (bus->number << 16) \| (devfn << 8);

	return addr;
	}

	static int
	dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 *value)
	{
	unsigned long addr = dc21285_base_address(bus, devfn);
	u32 v = 0xffffffff;

	if (addr)
	switch (size) {
	case 1:
	asm("ldrb %0, [%1, %2]"
	: "=r" (v) : "r" (addr), "r" (where) : "cc");
	break;
	case 2:
	asm("ldrh %0, [%1, %2]"
	: "=r" (v) : "r" (addr), "r" (where) : "cc");
	break;
	case 4:
	asm("ldr %0, [%1, %2]"
	: "=r" (v) : "r" (addr), "r" (where) : "cc");
	break;
	}

	*value = v;

	v = *CSR_PCICMD;
	if (v & PCICMD_ABORT) {
	*CSR_PCICMD = v & (0xffff\|PCICMD_ABORT);
	return -1;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static int
	dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 value)
	{
	unsigned long addr = dc21285_base_address(bus, devfn);
	u32 v;

	if (addr)
	switch (size) {
	case 1:
	asm("strb %0, [%1, %2]"
	: : "r" (value), "r" (addr), "r" (where)
	: "cc");
	break;
	case 2:
	asm("strh %0, [%1, %2]"
	: : "r" (value), "r" (addr), "r" (where)
	: "cc");
	break;
	case 4:
	asm("str %0, [%1, %2]"
	: : "r" (value), "r" (addr), "r" (where)
	: "cc");
	break;
	}

	v = *CSR_PCICMD;
	if (v & PCICMD_ABORT) {
	*CSR_PCICMD = v & (0xffff\|PCICMD_ABORT);
	return -1;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	struct pci_ops dc21285_ops = {
	.read = dc21285_read_config,
	.write = dc21285_write_config,
	};

	static struct timer_list serr_timer;
	static struct timer_list perr_timer;

	static void dc21285_enable_error(unsigned long __data)
	{
	switch (__data) {
	case IRQ_PCI_SERR:
	del_timer(&serr_timer);
	break;

	case IRQ_PCI_PERR:
	del_timer(&perr_timer);
	break;
	}

	enable_irq(__data);
	}

	/*
	* Warn on PCI errors.
	*/
	static irqreturn_t dc21285_abort_irq(int irq, void *dev_id)
	{
	unsigned int cmd;
	unsigned int status;

	cmd = *CSR_PCICMD;
	status = cmd >> 16;
	cmd = cmd & 0xffff;

	if (status & PCI_STATUS_REC_MASTER_ABORT) {
	printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
	instruction_pointer(get_irq_regs()));
	cmd \|= PCI_STATUS_REC_MASTER_ABORT << 16;
	}

	if (status & PCI_STATUS_REC_TARGET_ABORT) {
	printk(KERN_DEBUG "PCI: target abort: ");
	pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT \|
	PCI_STATUS_SIG_TARGET_ABORT \|
	PCI_STATUS_REC_TARGET_ABORT, 1);
	printk("\n");

	cmd \|= PCI_STATUS_REC_TARGET_ABORT << 16;
	}

	*CSR_PCICMD = cmd;

	return IRQ_HANDLED;
	}

	static irqreturn_t dc21285_serr_irq(int irq, void *dev_id)
	{
	struct timer_list *timer = dev_id;
	unsigned int cntl;

	printk(KERN_DEBUG "PCI: system error received: ");
	pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
	printk("\n");

	cntl = *CSR_SA110_CNTL & 0xffffdf07;
	*CSR_SA110_CNTL = cntl \| SA110_CNTL_RXSERR;

	/*
	* back off this interrupt
	*/
	disable_irq(irq);
	timer->expires = jiffies + HZ;
	add_timer(timer);

	return IRQ_HANDLED;
	}

	static irqreturn_t dc21285_discard_irq(int irq, void *dev_id)
	{
	printk(KERN_DEBUG "PCI: discard timer expired\n");
	*CSR_SA110_CNTL &= 0xffffde07;

	return IRQ_HANDLED;
	}

	static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id)
	{
	unsigned int cmd;

	printk(KERN_DEBUG "PCI: data parity error detected: ");
	pcibios_report_status(PCI_STATUS_PARITY \| PCI_STATUS_DETECTED_PARITY, 1);
	printk("\n");

	cmd = *CSR_PCICMD & 0xffff;
	*CSR_PCICMD = cmd \| 1 << 24;

	return IRQ_HANDLED;
	}

	static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
	{
	struct timer_list *timer = dev_id;
	unsigned int cmd;

	printk(KERN_DEBUG "PCI: parity error detected: ");
	pcibios_report_status(PCI_STATUS_PARITY \| PCI_STATUS_DETECTED_PARITY, 1);
	printk("\n");

	cmd = *CSR_PCICMD & 0xffff;
	*CSR_PCICMD = cmd \| 1 << 31;

	/*
	* back off this interrupt
	*/
	disable_irq(irq);
	timer->expires = jiffies + HZ;
	add_timer(timer);

	return IRQ_HANDLED;
	}

	int __init dc21285_setup(int nr, struct pci_sys_data *sys)
	{
	struct resource *res;

	if (nr \|\| !footbridge_cfn_mode())
	return 0;

	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
	if (!res) {
	printk("out of memory for root bus resources");
	return 0;
	}

	res[0].flags = IORESOURCE_MEM;
	res[0].name = "Footbridge non-prefetch";
	res[1].flags = IORESOURCE_MEM \| IORESOURCE_PREFETCH;
	res[1].name = "Footbridge prefetch";

	allocate_resource(&iomem_resource, &res[1], 0x20000000,
	0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
	allocate_resource(&iomem_resource, &res[0], 0x40000000,
	0x80000000, 0xffffffff, 0x40000000, NULL, NULL);

	sys->mem_offset = DC21285_PCI_MEM;

	pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
	pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);

	return 1;
	}

	#define dc21285_request_irq(_a, _b, _c, _d, _e) \
	WARN_ON(request_irq(_a, _b, _c, _d, _e) < 0)

	void __init dc21285_preinit(void)
	{
	unsigned int mem_size, mem_mask;
	int cfn_mode;

	pcibios_min_mem = 0x81000000;
	vga_base = PCIMEM_BASE;

	mem_size = (unsigned int)high_memory - PAGE_OFFSET;
	for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
	if (mem_mask >= mem_size)
	break;

	/*
	* These registers need to be set up whether we're the
	* central function or not.
	*/
	*CSR_SDRAMBASEMASK = (mem_mask - 1) & 0x0ffc0000;
	*CSR_SDRAMBASEOFFSET = 0;
	*CSR_ROMBASEMASK = 0x80000000;
	*CSR_CSRBASEMASK = 0;
	*CSR_CSRBASEOFFSET = 0;
	*CSR_PCIADDR_EXTN = 0;

	cfn_mode = __footbridge_cfn_mode();

	printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
	"%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
	"central function" : "addin");

	if (footbridge_cfn_mode()) {
	/*
	* Clear any existing errors - we aren't
	* interested in historical data...
	*/
	CSR_SA110_CNTL = (CSR_SA110_CNTL & 0xffffde07) \|
	SA110_CNTL_RXSERR;
	CSR_PCICMD = (CSR_PCICMD & 0xffff) \| PCICMD_ERROR_BITS;
	}

	init_timer(&serr_timer);
	init_timer(&perr_timer);

	serr_timer.data = IRQ_PCI_SERR;
	serr_timer.function = dc21285_enable_error;
	perr_timer.data = IRQ_PCI_PERR;
	perr_timer.function = dc21285_enable_error;

	/*
	* We don't care if these fail.
	*/
	dc21285_request_irq(IRQ_PCI_SERR, dc21285_serr_irq, IRQF_DISABLED,
	"PCI system error", &serr_timer);
	dc21285_request_irq(IRQ_PCI_PERR, dc21285_parity_irq, IRQF_DISABLED,
	"PCI parity error", &perr_timer);
	dc21285_request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, IRQF_DISABLED,
	"PCI abort", NULL);
	dc21285_request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, IRQF_DISABLED,
	"Discard timer", NULL);
	dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, IRQF_DISABLED,
	"PCI data parity", NULL);

	if (cfn_mode) {
	/*
	* Map our SDRAM at a known address in PCI space, just in case
	* the firmware had other ideas. Using a nonzero base is
	* necessary, since some VGA cards forcefully use PCI addresses
	* in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
	*/
	*CSR_PCICSRBASE = 0xf4000000;
	*CSR_PCICSRIOBASE = 0;
	*CSR_PCISDRAMBASE = __virt_to_bus(PAGE_OFFSET);
	*CSR_PCIROMBASE = 0;
	*CSR_PCICMD = PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER \|
	PCI_COMMAND_INVALIDATE \| PCICMD_ERROR_BITS;
	} else if (footbridge_cfn_mode() != 0) {
	/*
	* If we are not compiled to accept "add-in" mode, then
	* we are using a constant virt_to_bus translation which
	* can not hope to cater for the way the host BIOS has
	* set up the machine.
	*/
	panic("PCI: this kernel is compiled for central "
	"function mode only");
	}
	}

	void __init dc21285_postinit(void)
	{
	register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
	}