arch/arm/mach-versatile/pci.c - kernel/msm-4.19 - Gitiles

 /*
  *  linux/arch/arm/mach-versatile/pci.c
  *
  * (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
  * You can redistribute and/or modify this software under the terms of version 2
  * of the GNU General Public License as published by the Free Software Foundation.
  * THIS SOFTWARE IS PROVIDED "AS IS" 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.
  * Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
  *
  * ARM Versatile PCI driver.
  *
  * 14/04/2005 Initial version, colin.king@philips.com
  *
  */
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/init.h>
 #include <linux/io.h>

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

 /*
  * these spaces are mapped using the following base registers:
  *
  * Usage Local Bus Memory         Base/Map registers used
  *
  * Mem   50000000 - 5FFFFFFF      LB_BASE0/LB_MAP0,  non prefetch
  * Mem   60000000 - 6FFFFFFF      LB_BASE1/LB_MAP1,  prefetch
  * IO    44000000 - 4FFFFFFF      LB_BASE2/LB_MAP2,  IO
  * Cfg   42000000 - 42FFFFFF	  PCI config
  *
  */
 #define __IO_ADDRESS(n) ((void __iomem *)(unsigned long)IO_ADDRESS(n))
 #define SYS_PCICTL		__IO_ADDRESS(VERSATILE_SYS_PCICTL)
 #define PCI_IMAP0		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
 #define PCI_IMAP1		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
 #define PCI_IMAP2		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
 #define PCI_SMAP0		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
 #define PCI_SMAP1		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
 #define PCI_SMAP2		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
 #define PCI_SELFID		__IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)

 #define DEVICE_ID_OFFSET		0x00
 #define CSR_OFFSET			0x04
 #define CLASS_ID_OFFSET			0x08

 #define VP_PCI_DEVICE_ID		0x030010ee
 #define VP_PCI_CLASS_ID			0x0b400000

 static unsigned long pci_slot_ignore = 0;

 static int __init versatile_pci_slot_ignore(char *str)
 {
 	int retval;
 	int slot;

 	while ((retval = get_option(&str,&slot))) {
 		if ((slot < 0) || (slot > 31)) {
 			printk("Illegal slot value: %d\n",slot);
 		} else {
 			pci_slot_ignore |= (1 << slot);
 		}
 	}
 	return 1;
 }

 __setup("pci_slot_ignore=", versatile_pci_slot_ignore);


 static void __iomem *__pci_addr(struct pci_bus *bus,
 				unsigned int devfn, int offset)
 {
 	unsigned int busnr = bus->number;

 	/*
 	 * Trap out illegal values
 	 */
 	if (offset > 255)
 		BUG();
 	if (busnr > 255)
 		BUG();
 	if (devfn > 255)
 		BUG();

 	return VERSATILE_PCI_CFG_VIRT_BASE + ((busnr << 16) |
 		(PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset);
 }

 static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 				 int size, u32 *val)
 {
 	void __iomem *addr = __pci_addr(bus, devfn, where & ~3);
 	u32 v;
 	int slot = PCI_SLOT(devfn);

 	if (pci_slot_ignore & (1 << slot)) {
 		/* Ignore this slot */
 		switch (size) {
 		case 1:
 			v = 0xff;
 			break;
 		case 2:
 			v = 0xffff;
 			break;
 		default:
 			v = 0xffffffff;
 		}
 	} else {
 		switch (size) {
 		case 1:
 			v = __raw_readl(addr);
 			if (where & 2) v >>= 16;
 			if (where & 1) v >>= 8;
  			v &= 0xff;
 			break;

 		case 2:
 			v = __raw_readl(addr);
 			if (where & 2) v >>= 16;
  			v &= 0xffff;
 			break;

 		default:
 			v = __raw_readl(addr);
 			break;
 		}
 	}

 	*val = v;
 	return PCIBIOS_SUCCESSFUL;
 }

 static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 				  int size, u32 val)
 {
 	void __iomem *addr = __pci_addr(bus, devfn, where);
 	int slot = PCI_SLOT(devfn);

 	if (pci_slot_ignore & (1 << slot)) {
 		return PCIBIOS_SUCCESSFUL;
 	}

 	switch (size) {
 	case 1:
 		__raw_writeb((u8)val, addr);
 		break;

 	case 2:
 		__raw_writew((u16)val, addr);
 		break;

 	case 4:
 		__raw_writel(val, addr);
 		break;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops pci_versatile_ops = {
 	.read	= versatile_read_config,
 	.write	= versatile_write_config,
 };

 static struct resource io_mem = {
 	.name	= "PCI I/O space",
 	.start	= VERSATILE_PCI_MEM_BASE0,
 	.end	= VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
 	.flags	= IORESOURCE_IO,
 };

 static struct resource non_mem = {
 	.name	= "PCI non-prefetchable",
 	.start	= VERSATILE_PCI_MEM_BASE1,
 	.end	= VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
 	.flags	= IORESOURCE_MEM,
 };

 static struct resource pre_mem = {
 	.name	= "PCI prefetchable",
 	.start	= VERSATILE_PCI_MEM_BASE2,
 	.end	= VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
 	.flags	= IORESOURCE_MEM | IORESOURCE_PREFETCH,
 };

 static int __init pci_versatile_setup_resources(struct list_head *resources)
 {
 	int ret = 0;

 	ret = request_resource(&iomem_resource, &io_mem);
 	if (ret) {
 		printk(KERN_ERR "PCI: unable to allocate I/O "
 		       "memory region (%d)\n", ret);
 		goto out;
 	}
 	ret = request_resource(&iomem_resource, &non_mem);
 	if (ret) {
 		printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
 		       "memory region (%d)\n", ret);
 		goto release_io_mem;
 	}
 	ret = request_resource(&iomem_resource, &pre_mem);
 	if (ret) {
 		printk(KERN_ERR "PCI: unable to allocate prefetchable "
 		       "memory region (%d)\n", ret);
 		goto release_non_mem;
 	}

 	/*
 	 * the IO resource for this bus
 	 * the mem resource for this bus
 	 * the prefetch mem resource for this bus
 	 */
 	pci_add_resource_offset(resources, &io_mem, sys->io_offset);
 	pci_add_resource_offset(resources, &non_mem, sys->mem_offset);
 	pci_add_resource_offset(resources, &pre_mem, sys->mem_offset);

 	goto out;

  release_non_mem:
 	release_resource(&non_mem);
  release_io_mem:
 	release_resource(&io_mem);
  out:
 	return ret;
 }

 int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
 {
 	int ret = 0;
         int i;
         int myslot = -1;
 	unsigned long val;
 	void __iomem *local_pci_cfg_base;

 	val = __raw_readl(SYS_PCICTL);
 	if (!(val & 1)) {
 		printk("Not plugged into PCI backplane!\n");
 		ret = -EIO;
 		goto out;
 	}

 	if (nr == 0) {
 		sys->mem_offset = 0;
 		ret = pci_versatile_setup_resources(&sys->resources);
 		if (ret < 0) {
 			printk("pci_versatile_setup: resources... oops?\n");
 			goto out;
 		}
 	} else {
 		printk("pci_versatile_setup: resources... nr == 0??\n");
 		goto out;
 	}

 	/*
 	 *  We need to discover the PCI core first to configure itself
 	 *  before the main PCI probing is performed
 	 */
 	for (i=0; i<32; i++)
 		if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
 		    (__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
 			myslot = i;
 			break;
 		}

 	if (myslot == -1) {
 		printk("Cannot find PCI core!\n");
 		ret = -EIO;
 		goto out;
 	}

 	printk("PCI core found (slot %d)\n",myslot);

 	__raw_writel(myslot, PCI_SELFID);
 	local_pci_cfg_base = VERSATILE_PCI_CFG_VIRT_BASE + (myslot << 11);

 	val = __raw_readl(local_pci_cfg_base + CSR_OFFSET);
 	val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
 	__raw_writel(val, local_pci_cfg_base + CSR_OFFSET);

 	/*
 	 * Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM
 	 */
 	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0);
 	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1);
 	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2);

 	/*
 	 * Do not to map Versatile FPGA PCI device into memory space
 	 */
 	pci_slot_ignore |= (1 << myslot);
 	ret = 1;

  out:
 	return ret;
 }


 struct pci_bus * __init pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
 {
 	return pci_scan_root_bus(NULL, sys->busnr, &pci_versatile_ops, sys,
 				 &sys->resources);
 }

 void __init pci_versatile_preinit(void)
 {
 	pcibios_min_io = 0x44000000;
 	pcibios_min_mem = 0x50000000;

 	__raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28, PCI_IMAP0);
 	__raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28, PCI_IMAP1);
 	__raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28, PCI_IMAP2);

 	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP0);
 	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP1);
 	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP2);

 	__raw_writel(1, SYS_PCICTL);
 }

 /*
  * map the specified device/slot/pin to an IRQ.   Different backplanes may need to modify this.
  */
 static int __init versatile_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	int irq;
 	int devslot = PCI_SLOT(dev->devfn);

 	/* slot,  pin,	irq
 	 *  24     1     27
 	 *  25     1     28
 	 *  26     1     29
 	 *  27     1     30
 	 */
 	irq = 27 + ((slot + pin - 1) & 3);

 	printk("PCI map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);

 	return irq;
 }

 static struct hw_pci versatile_pci __initdata = {
 	.swizzle		= NULL,
 	.map_irq		= versatile_map_irq,
 	.nr_controllers		= 1,
 	.setup			= pci_versatile_setup,
 	.scan			= pci_versatile_scan_bus,
 	.preinit		= pci_versatile_preinit,
 };

 static int __init versatile_pci_init(void)
 {
 	pci_common_init(&versatile_pci);
 	return 0;
 }

 subsys_initcall(versatile_pci_init);
	/*
	* linux/arch/arm/mach-versatile/pci.c
	*
	* (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
	* You can redistribute and/or modify this software under the terms of version 2
	* of the GNU General Public License as published by the Free Software Foundation.
	* THIS SOFTWARE IS PROVIDED "AS IS" 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.
	* Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
	*
	* ARM Versatile PCI driver.
	*
	* 14/04/2005 Initial version, colin.king@philips.com
	*
	*/
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/ioport.h>
	#include <linux/interrupt.h>
	#include <linux/spinlock.h>
	#include <linux/init.h>
	#include <linux/io.h>

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

	/*
	* these spaces are mapped using the following base registers:
	*
	* Usage Local Bus Memory Base/Map registers used
	*
	* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch
	* Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch
	* IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO
	* Cfg 42000000 - 42FFFFFF PCI config
	*
	*/
	#define __IO_ADDRESS(n) ((void __iomem *)(unsigned long)IO_ADDRESS(n))
	#define SYS_PCICTL __IO_ADDRESS(VERSATILE_SYS_PCICTL)
	#define PCI_IMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
	#define PCI_IMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
	#define PCI_IMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
	#define PCI_SMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
	#define PCI_SMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
	#define PCI_SMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
	#define PCI_SELFID __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)

	#define DEVICE_ID_OFFSET 0x00
	#define CSR_OFFSET 0x04
	#define CLASS_ID_OFFSET 0x08

	#define VP_PCI_DEVICE_ID 0x030010ee
	#define VP_PCI_CLASS_ID 0x0b400000

	static unsigned long pci_slot_ignore = 0;

	static int __init versatile_pci_slot_ignore(char *str)
	{
	int retval;
	int slot;

	while ((retval = get_option(&str,&slot))) {
	if ((slot < 0) \|\| (slot > 31)) {
	printk("Illegal slot value: %d\n",slot);
	} else {
	pci_slot_ignore \|= (1 << slot);
	}
	}
	return 1;
	}

	__setup("pci_slot_ignore=", versatile_pci_slot_ignore);


	static void __iomem __pci_addr(struct pci_bus bus,
	unsigned int devfn, int offset)
	{
	unsigned int busnr = bus->number;

	/*
	* Trap out illegal values
	*/
	if (offset > 255)
	BUG();
	if (busnr > 255)
	BUG();
	if (devfn > 255)
	BUG();

	return VERSATILE_PCI_CFG_VIRT_BASE + ((busnr << 16) \|
	(PCI_SLOT(devfn) << 11) \| (PCI_FUNC(devfn) << 8) \| offset);
	}

	static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 *val)
	{
	void __iomem *addr = __pci_addr(bus, devfn, where & ~3);
	u32 v;
	int slot = PCI_SLOT(devfn);

	if (pci_slot_ignore & (1 << slot)) {
	/* Ignore this slot */
	switch (size) {
	case 1:
	v = 0xff;
	break;
	case 2:
	v = 0xffff;
	break;
	default:
	v = 0xffffffff;
	}
	} else {
	switch (size) {
	case 1:
	v = __raw_readl(addr);
	if (where & 2) v >>= 16;
	if (where & 1) v >>= 8;
	v &= 0xff;
	break;

	case 2:
	v = __raw_readl(addr);
	if (where & 2) v >>= 16;
	v &= 0xffff;
	break;

	default:
	v = __raw_readl(addr);
	break;
	}
	}

	*val = v;
	return PCIBIOS_SUCCESSFUL;
	}

	static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
	int size, u32 val)
	{
	void __iomem *addr = __pci_addr(bus, devfn, where);
	int slot = PCI_SLOT(devfn);

	if (pci_slot_ignore & (1 << slot)) {
	return PCIBIOS_SUCCESSFUL;
	}

	switch (size) {
	case 1:
	__raw_writeb((u8)val, addr);
	break;

	case 2:
	__raw_writew((u16)val, addr);
	break;

	case 4:
	__raw_writel(val, addr);
	break;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops pci_versatile_ops = {
	.read = versatile_read_config,
	.write = versatile_write_config,
	};

	static struct resource io_mem = {
	.name = "PCI I/O space",
	.start = VERSATILE_PCI_MEM_BASE0,
	.end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
	.flags = IORESOURCE_IO,
	};

	static struct resource non_mem = {
	.name = "PCI non-prefetchable",
	.start = VERSATILE_PCI_MEM_BASE1,
	.end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
	.flags = IORESOURCE_MEM,
	};

	static struct resource pre_mem = {
	.name = "PCI prefetchable",
	.start = VERSATILE_PCI_MEM_BASE2,
	.end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
	.flags = IORESOURCE_MEM \| IORESOURCE_PREFETCH,
	};

	static int __init pci_versatile_setup_resources(struct list_head *resources)
	{
	int ret = 0;

	ret = request_resource(&iomem_resource, &io_mem);
	if (ret) {
	printk(KERN_ERR "PCI: unable to allocate I/O "
	"memory region (%d)\n", ret);
	goto out;
	}
	ret = request_resource(&iomem_resource, &non_mem);
	if (ret) {
	printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
	"memory region (%d)\n", ret);
	goto release_io_mem;
	}
	ret = request_resource(&iomem_resource, &pre_mem);
	if (ret) {
	printk(KERN_ERR "PCI: unable to allocate prefetchable "
	"memory region (%d)\n", ret);
	goto release_non_mem;
	}

	/*
	* the IO resource for this bus
	* the mem resource for this bus
	* the prefetch mem resource for this bus
	*/
	pci_add_resource_offset(resources, &io_mem, sys->io_offset);
	pci_add_resource_offset(resources, &non_mem, sys->mem_offset);
	pci_add_resource_offset(resources, &pre_mem, sys->mem_offset);

	goto out;

	release_non_mem:
	release_resource(&non_mem);
	release_io_mem:
	release_resource(&io_mem);
	out:
	return ret;
	}

	int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
	{
	int ret = 0;
	int i;
	int myslot = -1;
	unsigned long val;
	void __iomem *local_pci_cfg_base;

	val = __raw_readl(SYS_PCICTL);
	if (!(val & 1)) {
	printk("Not plugged into PCI backplane!\n");
	ret = -EIO;
	goto out;
	}

	if (nr == 0) {
	sys->mem_offset = 0;
	ret = pci_versatile_setup_resources(&sys->resources);
	if (ret < 0) {
	printk("pci_versatile_setup: resources... oops?\n");
	goto out;
	}
	} else {
	printk("pci_versatile_setup: resources... nr == 0??\n");
	goto out;
	}

	/*
	* We need to discover the PCI core first to configure itself
	* before the main PCI probing is performed
	*/
	for (i=0; i<32; i++)
	if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
	(__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
	myslot = i;
	break;
	}

	if (myslot == -1) {
	printk("Cannot find PCI core!\n");
	ret = -EIO;
	goto out;
	}

	printk("PCI core found (slot %d)\n",myslot);

	__raw_writel(myslot, PCI_SELFID);
	local_pci_cfg_base = VERSATILE_PCI_CFG_VIRT_BASE + (myslot << 11);

	val = __raw_readl(local_pci_cfg_base + CSR_OFFSET);
	val \|= PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER \| PCI_COMMAND_INVALIDATE;
	__raw_writel(val, local_pci_cfg_base + CSR_OFFSET);

	/*
	* Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM
	*/
	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0);
	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1);
	__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2);

	/*
	* Do not to map Versatile FPGA PCI device into memory space
	*/
	pci_slot_ignore \|= (1 << myslot);
	ret = 1;

	out:
	return ret;
	}


	struct pci_bus * __init pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
	{
	return pci_scan_root_bus(NULL, sys->busnr, &pci_versatile_ops, sys,
	&sys->resources);
	}

	void __init pci_versatile_preinit(void)
	{
	pcibios_min_io = 0x44000000;
	pcibios_min_mem = 0x50000000;

	__raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28, PCI_IMAP0);
	__raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28, PCI_IMAP1);
	__raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28, PCI_IMAP2);

	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP0);
	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP1);
	__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP2);

	__raw_writel(1, SYS_PCICTL);
	}

	/*
	* map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
	*/
	static int __init versatile_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
	{
	int irq;
	int devslot = PCI_SLOT(dev->devfn);

	/* slot, pin, irq
	* 24 1 27
	* 25 1 28
	* 26 1 29
	* 27 1 30
	*/
	irq = 27 + ((slot + pin - 1) & 3);

	printk("PCI map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);

	return irq;
	}

	static struct hw_pci versatile_pci __initdata = {
	.swizzle = NULL,
	.map_irq = versatile_map_irq,
	.nr_controllers = 1,
	.setup = pci_versatile_setup,
	.scan = pci_versatile_scan_bus,
	.preinit = pci_versatile_preinit,
	};

	static int __init versatile_pci_init(void)
	{
	pci_common_init(&versatile_pci);
	return 0;
	}

	subsys_initcall(versatile_pci_init);