arch/m68k/atari/hades-pci.c - kernel/msm-4.9 - Gitiles

 /*
  * hades-pci.c - Hardware specific PCI BIOS functions the Hades Atari clone.
  *
  * Written by Wout Klaren.
  */

 #include <linux/config.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <asm/io.h>

 #if 0
 # define DBG_DEVS(args)		printk args
 #else
 # define DBG_DEVS(args)
 #endif

 #if defined(CONFIG_PCI) && defined(CONFIG_HADES)

 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/pci.h>

 #include <asm/atarihw.h>
 #include <asm/atariints.h>
 #include <asm/byteorder.h>
 #include <asm/pci.h>

 #define HADES_MEM_BASE		0x80000000
 #define HADES_MEM_SIZE		0x20000000
 #define HADES_CONFIG_BASE	0xA0000000
 #define HADES_CONFIG_SIZE	0x10000000
 #define HADES_IO_BASE		0xB0000000
 #define HADES_IO_SIZE		0x10000000
 #define HADES_VIRT_IO_SIZE	0x00010000	/* Only 64k is remapped and actually used. */

 #define N_SLOTS				4			/* Number of PCI slots. */

 static const char pci_mem_name[] = "PCI memory space";
 static const char pci_io_name[] = "PCI I/O space";
 static const char pci_config_name[] = "PCI config space";

 static struct resource config_space = {
     .name = pci_config_name,
     .start = HADES_CONFIG_BASE,
     .end = HADES_CONFIG_BASE + HADES_CONFIG_SIZE - 1
 };
 static struct resource io_space = {
     .name = pci_io_name,
     .start = HADES_IO_BASE,
     .end = HADES_IO_BASE + HADES_IO_SIZE - 1
 };

 static const unsigned long pci_conf_base_phys[] = {
     0xA0080000, 0xA0040000, 0xA0020000, 0xA0010000
 };
 static unsigned long pci_conf_base_virt[N_SLOTS];
 static unsigned long pci_io_base_virt;

 /*
  * static void *mk_conf_addr(unsigned char bus, unsigned char device_fn,
  *			     unsigned char where)
  *
  * Calculate the address of the PCI configuration area of the given
  * device.
  *
  * BUG: boards with multiple functions are probably not correctly
  * supported.
  */

 static void *mk_conf_addr(struct pci_dev *dev, int where)
 {
 	int device = dev->devfn >> 3, function = dev->devfn & 7;
 	void *result;

 	DBG_DEVS(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, pci_addr=0x%p)\n",
 		  dev->bus->number, dev->devfn, where, pci_addr));

 	if (device > 3)
 	{
 		DBG_DEVS(("mk_conf_addr: device (%d) > 3, returning NULL\n", device));
 		return NULL;
 	}

 	if (dev->bus->number != 0)
 	{
 		DBG_DEVS(("mk_conf_addr: bus (%d) > 0, returning NULL\n", device));
 		return NULL;
 	}

 	result = (void *) (pci_conf_base_virt[device] | (function << 8) | (where));
 	DBG_DEVS(("mk_conf_addr: returning pci_addr 0x%lx\n", (unsigned long) result));
 	return result;
 }

 static int hades_read_config_byte(struct pci_dev *dev, int where, u8 *value)
 {
 	volatile unsigned char *pci_addr;

 	*value = 0xff;

 	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	*value = *pci_addr;

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hades_read_config_word(struct pci_dev *dev, int where, u16 *value)
 {
 	volatile unsigned short *pci_addr;

 	*value = 0xffff;

 	if (where & 0x1)
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	*value = le16_to_cpu(*pci_addr);

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hades_read_config_dword(struct pci_dev *dev, int where, u32 *value)
 {
 	volatile unsigned int *pci_addr;
 	unsigned char header_type;
 	int result;

 	*value = 0xffffffff;

 	if (where & 0x3)
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	*value = le32_to_cpu(*pci_addr);

 	/*
 	 * Check if the value is an address on the bus. If true, add the
 	 * base address of the PCI memory or PCI I/O area on the Hades.
 	 */

 	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
 					     &header_type)) != PCIBIOS_SUCCESSFUL)
 		return result;

 	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) ||
 	    ((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
 							 (where <= PCI_BASE_ADDRESS_5))))
 	{
 		if ((*value & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
 		{
 			/*
 			 * Base address register that contains an I/O address. If the
 			 * address is valid on the Hades (0 <= *value < HADES_VIRT_IO_SIZE),
 			 * add 'pci_io_base_virt' to the value.
 			 */

 			if (*value < HADES_VIRT_IO_SIZE)
 				*value += pci_io_base_virt;
 		}
 		else
 		{
 			/*
 			 * Base address register that contains an memory address. If the
 			 * address is valid on the Hades (0 <= *value < HADES_MEM_SIZE),
 			 * add HADES_MEM_BASE to the value.
 			 */

 			if (*value == 0)
 			{
 				/*
 				 * Base address is 0. Test if this base
 				 * address register is used.
 				 */

 				*pci_addr = 0xffffffff;
 				if (*pci_addr != 0)
 				{
 					*pci_addr = *value;
 					if (*value < HADES_MEM_SIZE)
 						*value += HADES_MEM_BASE;
 				}
 			}
 			else
 			{
 				if (*value < HADES_MEM_SIZE)
 					*value += HADES_MEM_BASE;
 			}
 		}
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hades_write_config_byte(struct pci_dev *dev, int where, u8 value)
 {
 	volatile unsigned char *pci_addr;

 	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	*pci_addr = value;

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hades_write_config_word(struct pci_dev *dev, int where, u16 value)
 {
 	volatile unsigned short *pci_addr;

 	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	*pci_addr = cpu_to_le16(value);

 	return PCIBIOS_SUCCESSFUL;
 }

 static int hades_write_config_dword(struct pci_dev *dev, int where, u32 value)
 {
 	volatile unsigned int *pci_addr;
 	unsigned char header_type;
 	int result;

 	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;

 	/*
 	 * Check if the value is an address on the bus. If true, subtract the
 	 * base address of the PCI memory or PCI I/O area on the Hades.
 	 */

 	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
 					     &header_type)) != PCIBIOS_SUCCESSFUL)
 		return result;

 	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) ||
 	    ((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
 							 (where <= PCI_BASE_ADDRESS_5))))
 	{
 		if ((value & PCI_BASE_ADDRESS_SPACE) ==
 		    PCI_BASE_ADDRESS_SPACE_IO)
 		{
 			/*
 			 * I/O address. Check if the address is valid address on
 			 * the Hades (pci_io_base_virt <= value < pci_io_base_virt +
 			 * HADES_VIRT_IO_SIZE) or if the value is 0xffffffff. If not
 			 * true do not write the base address register. If it is a
 			 * valid base address subtract 'pci_io_base_virt' from the value.
 			 */

 			if ((value >= pci_io_base_virt) && (value < (pci_io_base_virt +
 														 HADES_VIRT_IO_SIZE)))
 				value -= pci_io_base_virt;
 			else
 			{
 				if (value != 0xffffffff)
 					return PCIBIOS_SET_FAILED;
 			}
 		}
 		else
 		{
 			/*
 			 * Memory address. Check if the address is valid address on
 			 * the Hades (HADES_MEM_BASE <= value < HADES_MEM_BASE + HADES_MEM_SIZE) or
 			 * if the value is 0xffffffff. If not true do not write
 			 * the base address register. If it is a valid base address
 			 * subtract HADES_MEM_BASE from the value.
 			 */

 			if ((value >= HADES_MEM_BASE) && (value < (HADES_MEM_BASE + HADES_MEM_SIZE)))
 				value -= HADES_MEM_BASE;
 			else
 			{
 				if (value != 0xffffffff)
 					return PCIBIOS_SET_FAILED;
 			}
 		}
 	}

 	*pci_addr = cpu_to_le32(value);

 	return PCIBIOS_SUCCESSFUL;
 }

 /*
  * static inline void hades_fixup(void)
  *
  * Assign IRQ numbers as used by Linux to the interrupt pins
  * of the PCI cards.
  */

 static void __init hades_fixup(int pci_modify)
 {
 	char irq_tab[4] = {
 		[0] = IRQ_TT_MFP_IO0,		/* Slot 0. */
 		[1] = IRQ_TT_MFP_IO1,		/* Slot 1. */
 		[2] = IRQ_TT_MFP_SCC,		/* Slot 2. */
 		[3] = IRQ_TT_MFP_SCSIDMA	/* Slot 3. */
 	};
 	struct pci_dev *dev = NULL;
 	unsigned char slot;

 	/*
 	 * Go through all devices, fixing up irqs as we see fit:
 	 */

 	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
 	{
 		if (dev->class >> 16 != PCI_BASE_CLASS_BRIDGE)
 		{
 			slot = PCI_SLOT(dev->devfn);	/* Determine slot number. */
 			dev->irq = irq_tab[slot];
 			if (pci_modify)
 				pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 		}
 	}
 }

 /*
  * static void hades_conf_device(struct pci_dev *dev)
  *
  * Machine dependent Configure the given device.
  *
  * Parameters:
  *
  * dev		- the pci device.
  */

 static void __init hades_conf_device(struct pci_dev *dev)
 {
 	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0);
 }

 static struct pci_ops hades_pci_ops = {
 	.read_byte =	hades_read_config_byte,
 	.read_word =	hades_read_config_word,
 	.read_dword =	hades_read_config_dword,
 	.write_byte =	hades_write_config_byte,
 	.write_word =	hades_write_config_word,
 	.write_dword =	hades_write_config_dword
 };

 /*
  * struct pci_bus_info *init_hades_pci(void)
  *
  * Machine specific initialisation:
  *
  * - Allocate and initialise a 'pci_bus_info' structure
  * - Initialise hardware
  *
  * Result: pointer to 'pci_bus_info' structure.
  */

 struct pci_bus_info * __init init_hades_pci(void)
 {
 	struct pci_bus_info *bus;
 	int i;

 	/*
 	 * Remap I/O and configuration space.
 	 */

 	pci_io_base_virt = (unsigned long) ioremap(HADES_IO_BASE, HADES_VIRT_IO_SIZE);

 	for (i = 0; i < N_SLOTS; i++)
 		pci_conf_base_virt[i] = (unsigned long) ioremap(pci_conf_base_phys[i], 0x10000);

 	/*
 	 * Allocate memory for bus info structure.
 	 */

 	bus = kmalloc(sizeof(struct pci_bus_info), GFP_KERNEL);
 	if (!bus)
 		return NULL;
 	memset(bus, 0, sizeof(struct pci_bus_info));

 	/*
 	 * Claim resources. The m68k has no separate I/O space, both
 	 * PCI memory space and PCI I/O space are in memory space. Therefore
 	 * the I/O resources are requested in memory space as well.
 	 */

 	if (request_resource(&iomem_resource, &config_space) != 0)
 	{
 		kfree(bus);
 		return NULL;
 	}

 	if (request_resource(&iomem_resource, &io_space) != 0)
 	{
 		release_resource(&config_space);
 		kfree(bus);
 		return NULL;
 	}

 	bus->mem_space.start = HADES_MEM_BASE;
 	bus->mem_space.end = HADES_MEM_BASE + HADES_MEM_SIZE - 1;
 	bus->mem_space.name = pci_mem_name;
 #if 1
 	if (request_resource(&iomem_resource, &bus->mem_space) != 0)
 	{
 		release_resource(&io_space);
 		release_resource(&config_space);
 		kfree(bus);
 		return NULL;
 	}
 #endif
 	bus->io_space.start = pci_io_base_virt;
 	bus->io_space.end = pci_io_base_virt + HADES_VIRT_IO_SIZE - 1;
 	bus->io_space.name = pci_io_name;
 #if 1
 	if (request_resource(&ioport_resource, &bus->io_space) != 0)
 	{
 		release_resource(&bus->mem_space);
 		release_resource(&io_space);
 		release_resource(&config_space);
 		kfree(bus);
 		return NULL;
 	}
 #endif
 	/*
 	 * Set hardware dependent functions.
 	 */

 	bus->m68k_pci_ops = &hades_pci_ops;
 	bus->fixup = hades_fixup;
 	bus->conf_device = hades_conf_device;

 	/*
 	 * Select high to low edge for PCI interrupts.
 	 */

 	tt_mfp.active_edge &= ~0x27;

 	return bus;
 }
 #endif
	/*
	* hades-pci.c - Hardware specific PCI BIOS functions the Hades Atari clone.
	*
	* Written by Wout Klaren.
	*/

	#include <linux/config.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <asm/io.h>

	#if 0
	# define DBG_DEVS(args) printk args
	#else
	# define DBG_DEVS(args)
	#endif

	#if defined(CONFIG_PCI) && defined(CONFIG_HADES)

	#include <linux/slab.h>
	#include <linux/mm.h>
	#include <linux/pci.h>

	#include <asm/atarihw.h>
	#include <asm/atariints.h>
	#include <asm/byteorder.h>
	#include <asm/pci.h>

	#define HADES_MEM_BASE 0x80000000
	#define HADES_MEM_SIZE 0x20000000
	#define HADES_CONFIG_BASE 0xA0000000
	#define HADES_CONFIG_SIZE 0x10000000
	#define HADES_IO_BASE 0xB0000000
	#define HADES_IO_SIZE 0x10000000
	#define HADES_VIRT_IO_SIZE 0x00010000 /* Only 64k is remapped and actually used. */

	#define N_SLOTS 4 /* Number of PCI slots. */

	static const char pci_mem_name[] = "PCI memory space";
	static const char pci_io_name[] = "PCI I/O space";
	static const char pci_config_name[] = "PCI config space";

	static struct resource config_space = {
	.name = pci_config_name,
	.start = HADES_CONFIG_BASE,
	.end = HADES_CONFIG_BASE + HADES_CONFIG_SIZE - 1
	};
	static struct resource io_space = {
	.name = pci_io_name,
	.start = HADES_IO_BASE,
	.end = HADES_IO_BASE + HADES_IO_SIZE - 1
	};

	static const unsigned long pci_conf_base_phys[] = {
	0xA0080000, 0xA0040000, 0xA0020000, 0xA0010000
	};
	static unsigned long pci_conf_base_virt[N_SLOTS];
	static unsigned long pci_io_base_virt;

	/*
	* static void *mk_conf_addr(unsigned char bus, unsigned char device_fn,
	* unsigned char where)
	*
	* Calculate the address of the PCI configuration area of the given
	* device.
	*
	* BUG: boards with multiple functions are probably not correctly
	* supported.
	*/

	static void mk_conf_addr(struct pci_dev dev, int where)
	{
	int device = dev->devfn >> 3, function = dev->devfn & 7;
	void *result;

	DBG_DEVS(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, pci_addr=0x%p)\n",
	dev->bus->number, dev->devfn, where, pci_addr));

	if (device > 3)
	{
	DBG_DEVS(("mk_conf_addr: device (%d) > 3, returning NULL\n", device));
	return NULL;
	}

	if (dev->bus->number != 0)
	{
	DBG_DEVS(("mk_conf_addr: bus (%d) > 0, returning NULL\n", device));
	return NULL;
	}

	result = (void *) (pci_conf_base_virt[device] \| (function << 8) \| (where));
	DBG_DEVS(("mk_conf_addr: returning pci_addr 0x%lx\n", (unsigned long) result));
	return result;
	}

	static int hades_read_config_byte(struct pci_dev dev, int where, u8 value)
	{
	volatile unsigned char *pci_addr;

	*value = 0xff;

	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	value = pci_addr;

	return PCIBIOS_SUCCESSFUL;
	}

	static int hades_read_config_word(struct pci_dev dev, int where, u16 value)
	{
	volatile unsigned short *pci_addr;

	*value = 0xffff;

	if (where & 0x1)
	return PCIBIOS_BAD_REGISTER_NUMBER;

	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	value = le16_to_cpu(pci_addr);

	return PCIBIOS_SUCCESSFUL;
	}

	static int hades_read_config_dword(struct pci_dev dev, int where, u32 value)
	{
	volatile unsigned int *pci_addr;
	unsigned char header_type;
	int result;

	*value = 0xffffffff;

	if (where & 0x3)
	return PCIBIOS_BAD_REGISTER_NUMBER;

	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	value = le32_to_cpu(pci_addr);

	/*
	* Check if the value is an address on the bus. If true, add the
	* base address of the PCI memory or PCI I/O area on the Hades.
	*/

	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
	&header_type)) != PCIBIOS_SUCCESSFUL)
	return result;

	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) \|\|
	((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
	(where <= PCI_BASE_ADDRESS_5))))
	{
	if ((*value & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
	{
	/*
	* Base address register that contains an I/O address. If the
	* address is valid on the Hades (0 <= *value < HADES_VIRT_IO_SIZE),
	* add 'pci_io_base_virt' to the value.
	*/

	if (*value < HADES_VIRT_IO_SIZE)
	*value += pci_io_base_virt;
	}
	else
	{
	/*
	* Base address register that contains an memory address. If the
	* address is valid on the Hades (0 <= *value < HADES_MEM_SIZE),
	* add HADES_MEM_BASE to the value.
	*/

	if (*value == 0)
	{
	/*
	* Base address is 0. Test if this base
	* address register is used.
	*/

	*pci_addr = 0xffffffff;
	if (*pci_addr != 0)
	{
	pci_addr = value;
	if (*value < HADES_MEM_SIZE)
	*value += HADES_MEM_BASE;
	}
	}
	else
	{
	if (*value < HADES_MEM_SIZE)
	*value += HADES_MEM_BASE;
	}
	}
	}

	return PCIBIOS_SUCCESSFUL;
	}

	static int hades_write_config_byte(struct pci_dev *dev, int where, u8 value)
	{
	volatile unsigned char *pci_addr;

	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	*pci_addr = value;

	return PCIBIOS_SUCCESSFUL;
	}

	static int hades_write_config_word(struct pci_dev *dev, int where, u16 value)
	{
	volatile unsigned short *pci_addr;

	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	*pci_addr = cpu_to_le16(value);

	return PCIBIOS_SUCCESSFUL;
	}

	static int hades_write_config_dword(struct pci_dev *dev, int where, u32 value)
	{
	volatile unsigned int *pci_addr;
	unsigned char header_type;
	int result;

	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
	return PCIBIOS_DEVICE_NOT_FOUND;

	/*
	* Check if the value is an address on the bus. If true, subtract the
	* base address of the PCI memory or PCI I/O area on the Hades.
	*/

	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
	&header_type)) != PCIBIOS_SUCCESSFUL)
	return result;

	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) \|\|
	((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
	(where <= PCI_BASE_ADDRESS_5))))
	{
	if ((value & PCI_BASE_ADDRESS_SPACE) ==
	PCI_BASE_ADDRESS_SPACE_IO)
	{
	/*
	* I/O address. Check if the address is valid address on
	* the Hades (pci_io_base_virt <= value < pci_io_base_virt +
	* HADES_VIRT_IO_SIZE) or if the value is 0xffffffff. If not
	* true do not write the base address register. If it is a
	* valid base address subtract 'pci_io_base_virt' from the value.
	*/

	if ((value >= pci_io_base_virt) && (value < (pci_io_base_virt +
	HADES_VIRT_IO_SIZE)))
	value -= pci_io_base_virt;
	else
	{
	if (value != 0xffffffff)
	return PCIBIOS_SET_FAILED;
	}
	}
	else
	{
	/*
	* Memory address. Check if the address is valid address on
	* the Hades (HADES_MEM_BASE <= value < HADES_MEM_BASE + HADES_MEM_SIZE) or
	* if the value is 0xffffffff. If not true do not write
	* the base address register. If it is a valid base address
	* subtract HADES_MEM_BASE from the value.
	*/

	if ((value >= HADES_MEM_BASE) && (value < (HADES_MEM_BASE + HADES_MEM_SIZE)))
	value -= HADES_MEM_BASE;
	else
	{
	if (value != 0xffffffff)
	return PCIBIOS_SET_FAILED;
	}
	}
	}

	*pci_addr = cpu_to_le32(value);

	return PCIBIOS_SUCCESSFUL;
	}

	/*
	* static inline void hades_fixup(void)
	*
	* Assign IRQ numbers as used by Linux to the interrupt pins
	* of the PCI cards.
	*/

	static void __init hades_fixup(int pci_modify)
	{
	char irq_tab[4] = {
	[0] = IRQ_TT_MFP_IO0, /* Slot 0. */
	[1] = IRQ_TT_MFP_IO1, /* Slot 1. */
	[2] = IRQ_TT_MFP_SCC, /* Slot 2. */
	[3] = IRQ_TT_MFP_SCSIDMA /* Slot 3. */
	};
	struct pci_dev *dev = NULL;
	unsigned char slot;

	/*
	* Go through all devices, fixing up irqs as we see fit:
	*/

	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
	{
	if (dev->class >> 16 != PCI_BASE_CLASS_BRIDGE)
	{
	slot = PCI_SLOT(dev->devfn); /* Determine slot number. */
	dev->irq = irq_tab[slot];
	if (pci_modify)
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	}
	}
	}

	/*
	* static void hades_conf_device(struct pci_dev *dev)
	*
	* Machine dependent Configure the given device.
	*
	* Parameters:
	*
	* dev - the pci device.
	*/

	static void __init hades_conf_device(struct pci_dev *dev)
	{
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0);
	}

	static struct pci_ops hades_pci_ops = {
	.read_byte = hades_read_config_byte,
	.read_word = hades_read_config_word,
	.read_dword = hades_read_config_dword,
	.write_byte = hades_write_config_byte,
	.write_word = hades_write_config_word,
	.write_dword = hades_write_config_dword
	};

	/*
	* struct pci_bus_info *init_hades_pci(void)
	*
	* Machine specific initialisation:
	*
	* - Allocate and initialise a 'pci_bus_info' structure
	* - Initialise hardware
	*
	* Result: pointer to 'pci_bus_info' structure.
	*/

	struct pci_bus_info * __init init_hades_pci(void)
	{
	struct pci_bus_info *bus;
	int i;

	/*
	* Remap I/O and configuration space.
	*/

	pci_io_base_virt = (unsigned long) ioremap(HADES_IO_BASE, HADES_VIRT_IO_SIZE);

	for (i = 0; i < N_SLOTS; i++)
	pci_conf_base_virt[i] = (unsigned long) ioremap(pci_conf_base_phys[i], 0x10000);

	/*
	* Allocate memory for bus info structure.
	*/

	bus = kmalloc(sizeof(struct pci_bus_info), GFP_KERNEL);
	if (!bus)
	return NULL;
	memset(bus, 0, sizeof(struct pci_bus_info));

	/*
	* Claim resources. The m68k has no separate I/O space, both
	* PCI memory space and PCI I/O space are in memory space. Therefore
	* the I/O resources are requested in memory space as well.
	*/

	if (request_resource(&iomem_resource, &config_space) != 0)
	{
	kfree(bus);
	return NULL;
	}

	if (request_resource(&iomem_resource, &io_space) != 0)
	{
	release_resource(&config_space);
	kfree(bus);
	return NULL;
	}

	bus->mem_space.start = HADES_MEM_BASE;
	bus->mem_space.end = HADES_MEM_BASE + HADES_MEM_SIZE - 1;
	bus->mem_space.name = pci_mem_name;
	#if 1
	if (request_resource(&iomem_resource, &bus->mem_space) != 0)
	{
	release_resource(&io_space);
	release_resource(&config_space);
	kfree(bus);
	return NULL;
	}
	#endif
	bus->io_space.start = pci_io_base_virt;
	bus->io_space.end = pci_io_base_virt + HADES_VIRT_IO_SIZE - 1;
	bus->io_space.name = pci_io_name;
	#if 1
	if (request_resource(&ioport_resource, &bus->io_space) != 0)
	{
	release_resource(&bus->mem_space);
	release_resource(&io_space);
	release_resource(&config_space);
	kfree(bus);
	return NULL;
	}
	#endif
	/*
	* Set hardware dependent functions.
	*/

	bus->m68k_pci_ops = &hades_pci_ops;
	bus->fixup = hades_fixup;
	bus->conf_device = hades_conf_device;

	/*
	* Select high to low edge for PCI interrupts.
	*/

	tt_mfp.active_edge &= ~0x27;

	return bus;
	}
	#endif