arch/m68k/kernel/bios32.c - linux/kernel/git/davem/net-next - Git at Google

 /*
  * bios32.c - PCI BIOS functions for m68k systems.
  *
  * Written by Wout Klaren.
  *
  * Based on the DEC Alpha bios32.c by Dave Rusling and David Mosberger.
  */

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

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

 #ifdef CONFIG_PCI

 /*
  * PCI support for Linux/m68k. Currently only the Hades is supported.
  *
  * The support for PCI bridges in the DEC Alpha version has
  * been removed in this version.
  */

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

 #include <asm/io.h>
 #include <asm/pci.h>
 #include <asm/uaccess.h>

 #define KB		1024
 #define MB		(1024*KB)
 #define GB		(1024*MB)

 #define MAJOR_REV	0
 #define MINOR_REV	5

 /*
  * Align VAL to ALIGN, which must be a power of two.
  */

 #define ALIGN(val,align)	(((val) + ((align) - 1)) & ~((align) - 1))

 /*
  * Offsets relative to the I/O and memory base addresses from where resources
  * are allocated.
  */

 #define IO_ALLOC_OFFSET		0x00004000
 #define MEM_ALLOC_OFFSET	0x04000000

 /*
  * Declarations of hardware specific initialisation functions.
  */

 extern struct pci_bus_info *init_hades_pci(void);

 /*
  * Bus info structure of the PCI bus. A pointer to this structure is
  * put in the sysdata member of the pci_bus structure.
  */

 static struct pci_bus_info *bus_info;

 static int pci_modify = 1;		/* If set, layout the PCI bus ourself. */
 static int skip_vga;			/* If set do not modify base addresses
 					   of vga cards.*/
 static int disable_pci_burst;		/* If set do not allow PCI bursts. */

 static unsigned int io_base;
 static unsigned int mem_base;

 /*
  * static void disable_dev(struct pci_dev *dev)
  *
  * Disable PCI device DEV so that it does not respond to I/O or memory
  * accesses.
  *
  * Parameters:
  *
  * dev	- device to disable.
  */

 static void __init disable_dev(struct pci_dev *dev)
 {
 	unsigned short cmd;

 	if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) ||
 	     (dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) ||
 	     (dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga)
 		return;

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);

 	cmd &= (~PCI_COMMAND_IO & ~PCI_COMMAND_MEMORY & ~PCI_COMMAND_MASTER);
 	pci_write_config_word(dev, PCI_COMMAND, cmd);
 }

 /*
  * static void layout_dev(struct pci_dev *dev)
  *
  * Layout memory and I/O for a device.
  *
  * Parameters:
  *
  * device	- device to layout memory and I/O for.
  */

 static void __init layout_dev(struct pci_dev *dev)
 {
 	unsigned short cmd;
 	unsigned int base, mask, size, reg;
 	unsigned int alignto;
 	int i;

 	/*
 	 * Skip video cards if requested.
 	 */

 	if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) ||
 	     (dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) ||
 	     (dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga)
 		return;

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);

 	for (reg = PCI_BASE_ADDRESS_0, i = 0; reg <= PCI_BASE_ADDRESS_5; reg += 4, i++)
 	{
 		/*
 		 * Figure out how much space and of what type this
 		 * device wants.
 		 */

 		pci_write_config_dword(dev, reg, 0xffffffff);
 		pci_read_config_dword(dev, reg, &base);

 		if (!base)
 		{
 			/* this base-address register is unused */
 			dev->resource[i].start = 0;
 			dev->resource[i].end = 0;
 			dev->resource[i].flags = 0;
 			continue;
 		}

 		/*
 		 * We've read the base address register back after
 		 * writing all ones and so now we must decode it.
 		 */

 		if (base & PCI_BASE_ADDRESS_SPACE_IO)
 		{
 			/*
 			 * I/O space base address register.
 			 */

 			cmd |= PCI_COMMAND_IO;

 			base &= PCI_BASE_ADDRESS_IO_MASK;
 			mask = (~base << 1) | 0x1;
 			size = (mask & base) & 0xffffffff;

 			/*
 			 * Align to multiple of size of minimum base.
 			 */

 			alignto = max_t(unsigned int, 0x040, size);
 			base = ALIGN(io_base, alignto);
 			io_base = base + size;
 			pci_write_config_dword(dev, reg, base | PCI_BASE_ADDRESS_SPACE_IO);

 			dev->resource[i].start = base;
 			dev->resource[i].end = dev->resource[i].start + size - 1;
 			dev->resource[i].flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;

 			DBG_DEVS(("layout_dev: IO address: %lX\n", base));
 		}
 		else
 		{
 			unsigned int type;

 			/*
 			 * Memory space base address register.
 			 */

 			cmd |= PCI_COMMAND_MEMORY;
 			type = base & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
 			base &= PCI_BASE_ADDRESS_MEM_MASK;
 			mask = (~base << 1) | 0x1;
 			size = (mask & base) & 0xffffffff;
 			switch (type)
 			{
 			case PCI_BASE_ADDRESS_MEM_TYPE_32:
 			case PCI_BASE_ADDRESS_MEM_TYPE_64:
 				break;

 			case PCI_BASE_ADDRESS_MEM_TYPE_1M:
 				printk("bios32 WARNING: slot %d, function %d "
 				       "requests memory below 1MB---don't "
 				       "know how to do that.\n",
 				       PCI_SLOT(dev->devfn),
 				       PCI_FUNC(dev->devfn));
 				continue;
 			}

 			/*
 			 * Align to multiple of size of minimum base.
 			 */

 			alignto = max_t(unsigned int, 0x1000, size);
 			base = ALIGN(mem_base, alignto);
 			mem_base = base + size;
 			pci_write_config_dword(dev, reg, base);

 			dev->resource[i].start = base;
 			dev->resource[i].end = dev->resource[i].start + size - 1;
 			dev->resource[i].flags = IORESOURCE_MEM;

 			if (type == PCI_BASE_ADDRESS_MEM_TYPE_64)
 			{
 				/*
 				 * 64-bit address, set the highest 32 bits
 				 * to zero.
 				 */

 				reg += 4;
 				pci_write_config_dword(dev, reg, 0);

 				i++;
 				dev->resource[i].start = 0;
 				dev->resource[i].end = 0;
 				dev->resource[i].flags = 0;
 			}
 		}
 	}

 	/*
 	 * Enable device:
 	 */

 	if (dev->class >> 8 == PCI_CLASS_NOT_DEFINED ||
 	    dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA ||
 	    dev->class >> 8 == PCI_CLASS_DISPLAY_VGA ||
 	    dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)
 	{
 		/*
 		 * All of these (may) have I/O scattered all around
 		 * and may not use i/o-base address registers at all.
 		 * So we just have to always enable I/O to these
 		 * devices.
 		 */
 		cmd |= PCI_COMMAND_IO;
 	}

 	pci_write_config_word(dev, PCI_COMMAND, cmd | PCI_COMMAND_MASTER);

 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, (disable_pci_burst) ? 0 : 32);

 	if (bus_info != NULL)
 		bus_info->conf_device(dev);	/* Machine dependent configuration. */

 	DBG_DEVS(("layout_dev: bus %d  slot 0x%x  VID 0x%x  DID 0x%x  class 0x%x\n",
 		  dev->bus->number, PCI_SLOT(dev->devfn), dev->vendor, dev->device, dev->class));
 }

 /*
  * static void layout_bus(struct pci_bus *bus)
  *
  * Layout memory and I/O for all devices on the given bus.
  *
  * Parameters:
  *
  * bus	- bus.
  */

 static void __init layout_bus(struct pci_bus *bus)
 {
 	unsigned int bio, bmem;
 	struct pci_dev *dev;

 	DBG_DEVS(("layout_bus: starting bus %d\n", bus->number));

 	if (!bus->devices && !bus->children)
 		return;

 	/*
 	 * Align the current bases on appropriate boundaries (4K for
 	 * IO and 1MB for memory).
 	 */

 	bio = io_base = ALIGN(io_base, 4*KB);
 	bmem = mem_base = ALIGN(mem_base, 1*MB);

 	/*
 	 * PCI devices might have been setup by a PCI BIOS emulation
 	 * running under TOS. In these cases there is a
 	 * window during which two devices may have an overlapping
 	 * address range. To avoid this causing trouble, we first
 	 * turn off the I/O and memory address decoders for all PCI
 	 * devices.  They'll be re-enabled only once all address
 	 * decoders are programmed consistently.
 	 */

 	DBG_DEVS(("layout_bus: disable_dev for bus %d\n", bus->number));

 	for (dev = bus->devices; dev; dev = dev->sibling)
 	{
 		if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) ||
 		    (dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA))
 			disable_dev(dev);
 	}

 	/*
 	 * Allocate space to each device:
 	 */

 	DBG_DEVS(("layout_bus: starting bus %d devices\n", bus->number));

 	for (dev = bus->devices; dev; dev = dev->sibling)
 	{
 		if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) ||
 		    (dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA))
 			layout_dev(dev);
 	}

 	DBG_DEVS(("layout_bus: bus %d finished\n", bus->number));
 }

 /*
  * static void pcibios_fixup(void)
  *
  * Layout memory and I/O of all devices on the PCI bus if 'pci_modify' is
  * true. This might be necessary because not every m68k machine with a PCI
  * bus has a PCI BIOS. This function should be called right after
  * pci_scan_bus() in pcibios_init().
  */

 static void __init pcibios_fixup(void)
 {
 	if (pci_modify)
 	{
 		/*
 		 * Set base addresses for allocation of I/O and memory space.
 		 */

 		io_base = bus_info->io_space.start + IO_ALLOC_OFFSET;
 		mem_base = bus_info->mem_space.start + MEM_ALLOC_OFFSET;

 		/*
 		 * Scan the tree, allocating PCI memory and I/O space.
 		 */

 		layout_bus(pci_bus_b(pci_root.next));
 	}

 	/*
 	 * Fix interrupt assignments, etc.
 	 */

 	bus_info->fixup(pci_modify);
 }

 /*
  * static void pcibios_claim_resources(struct pci_bus *bus)
  *
  * Claim all resources that are assigned to devices on the given bus.
  *
  * Parameters:
  *
  * bus	- bus.
  */

 static void __init pcibios_claim_resources(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 	int i;

 	while (bus)
 	{
 		for (dev = bus->devices; (dev != NULL); dev = dev->sibling)
 		{
 			for (i = 0; i < PCI_NUM_RESOURCES; i++)
 			{
 				struct resource *r = &dev->resource[i];
 				struct resource *pr;
 				struct pci_bus_info *bus_info = (struct pci_bus_info *) dev->sysdata;

 				if ((r->start == 0) || (r->parent != NULL))
 					continue;
 #if 1
 				if (r->flags & IORESOURCE_IO)
 					pr = &bus_info->io_space;
 				else
 					pr = &bus_info->mem_space;
 #else
 				if (r->flags & IORESOURCE_IO)
 					pr = &ioport_resource;
 				else
 					pr = &iomem_resource;
 #endif
 				if (request_resource(pr, r) < 0)
 				{
 					printk(KERN_ERR "PCI: Address space collision on region %d of device %s\n", i, dev->name);
 				}
 			}
 		}

 		if (bus->children)
 			pcibios_claim_resources(bus->children);

 		bus = bus->next;
 	}
 }

 /*
  * int pcibios_assign_resource(struct pci_dev *dev, int i)
  *
  * Assign a new address to a PCI resource.
  *
  * Parameters:
  *
  * dev	- device.
  * i	- resource.
  *
  * Result: 0 if successful.
  */

 int __init pcibios_assign_resource(struct pci_dev *dev, int i)
 {
 	struct resource *r = &dev->resource[i];
 	struct resource *pr = pci_find_parent_resource(dev, r);
 	unsigned long size = r->end + 1;

 	if (!pr)
 		return -EINVAL;

 	if (r->flags & IORESOURCE_IO)
 	{
 		if (size > 0x100)
 			return -EFBIG;

 		if (allocate_resource(pr, r, size, bus_info->io_space.start +
 				      IO_ALLOC_OFFSET,  bus_info->io_space.end, 1024))
 			return -EBUSY;
 	}
 	else
 	{
 		if (allocate_resource(pr, r, size, bus_info->mem_space.start +
 				      MEM_ALLOC_OFFSET, bus_info->mem_space.end, size))
 			return -EBUSY;
 	}

 	if (i < 6)
 		pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, r->start);

 	return 0;
 }

 void __init pcibios_fixup_bus(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 	void *sysdata;

 	sysdata = (bus->parent) ? bus->parent->sysdata : bus->sysdata;

 	for (dev = bus->devices; (dev != NULL); dev = dev->sibling)
 		dev->sysdata = sysdata;
 }

 void __init pcibios_init(void)
 {
 	printk("Linux/m68k PCI BIOS32 revision %x.%02x\n", MAJOR_REV, MINOR_REV);

 	bus_info = NULL;
 #ifdef CONFIG_HADES
 	if (MACH_IS_HADES)
 		bus_info = init_hades_pci();
 #endif
 	if (bus_info != NULL)
 	{
 		printk("PCI: Probing PCI hardware\n");
 		pci_scan_bus(0, bus_info->m68k_pci_ops, bus_info);
 		pcibios_fixup();
 		pcibios_claim_resources(pci_root);
 	}
 	else
 		printk("PCI: No PCI bus detected\n");
 }

 char * __init pcibios_setup(char *str)
 {
 	if (!strcmp(str, "nomodify"))
 	{
 		pci_modify = 0;
 		return NULL;
 	}
 	else if (!strcmp(str, "skipvga"))
 	{
 		skip_vga = 1;
 		return NULL;
 	}
 	else if (!strcmp(str, "noburst"))
 	{
 		disable_pci_burst = 1;
 		return NULL;
 	}

 	return str;
 }
 #endif /* CONFIG_PCI */
	/*
	* bios32.c - PCI BIOS functions for m68k systems.
	*
	* Written by Wout Klaren.
	*
	* Based on the DEC Alpha bios32.c by Dave Rusling and David Mosberger.
	*/

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

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

	#ifdef CONFIG_PCI

	/*
	* PCI support for Linux/m68k. Currently only the Hades is supported.
	*
	* The support for PCI bridges in the DEC Alpha version has
	* been removed in this version.
	*/

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

	#include <asm/io.h>
	#include <asm/pci.h>
	#include <asm/uaccess.h>

	#define KB 1024
	#define MB (1024*KB)
	#define GB (1024*MB)

	#define MAJOR_REV 0
	#define MINOR_REV 5

	/*
	* Align VAL to ALIGN, which must be a power of two.
	*/

	#define ALIGN(val,align) (((val) + ((align) - 1)) & ~((align) - 1))

	/*
	* Offsets relative to the I/O and memory base addresses from where resources
	* are allocated.
	*/

	#define IO_ALLOC_OFFSET 0x00004000
	#define MEM_ALLOC_OFFSET 0x04000000

	/*
	* Declarations of hardware specific initialisation functions.
	*/

	extern struct pci_bus_info *init_hades_pci(void);

	/*
	* Bus info structure of the PCI bus. A pointer to this structure is
	* put in the sysdata member of the pci_bus structure.
	*/

	static struct pci_bus_info *bus_info;

	static int pci_modify = 1; /* If set, layout the PCI bus ourself. */
	static int skip_vga; /* If set do not modify base addresses
	of vga cards.*/
	static int disable_pci_burst; /* If set do not allow PCI bursts. */

	static unsigned int io_base;
	static unsigned int mem_base;

	/*
	* static void disable_dev(struct pci_dev *dev)
	*
	* Disable PCI device DEV so that it does not respond to I/O or memory
	* accesses.
	*
	* Parameters:
	*
	* dev - device to disable.
	*/

	static void __init disable_dev(struct pci_dev *dev)
	{
	unsigned short cmd;

	if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) \|\|
	(dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) \|\|
	(dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga)
	return;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);

	cmd &= (~PCI_COMMAND_IO & ~PCI_COMMAND_MEMORY & ~PCI_COMMAND_MASTER);
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	}

	/*
	* static void layout_dev(struct pci_dev *dev)
	*
	* Layout memory and I/O for a device.
	*
	* Parameters:
	*
	* device - device to layout memory and I/O for.
	*/

	static void __init layout_dev(struct pci_dev *dev)
	{
	unsigned short cmd;
	unsigned int base, mask, size, reg;
	unsigned int alignto;
	int i;

	/*
	* Skip video cards if requested.
	*/

	if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) \|\|
	(dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) \|\|
	(dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga)
	return;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);

	for (reg = PCI_BASE_ADDRESS_0, i = 0; reg <= PCI_BASE_ADDRESS_5; reg += 4, i++)
	{
	/*
	* Figure out how much space and of what type this
	* device wants.
	*/

	pci_write_config_dword(dev, reg, 0xffffffff);
	pci_read_config_dword(dev, reg, &base);

	if (!base)
	{
	/* this base-address register is unused */
	dev->resource[i].start = 0;
	dev->resource[i].end = 0;
	dev->resource[i].flags = 0;
	continue;
	}

	/*
	* We've read the base address register back after
	* writing all ones and so now we must decode it.
	*/

	if (base & PCI_BASE_ADDRESS_SPACE_IO)
	{
	/*
	* I/O space base address register.
	*/

	cmd \|= PCI_COMMAND_IO;

	base &= PCI_BASE_ADDRESS_IO_MASK;
	mask = (~base << 1) \| 0x1;
	size = (mask & base) & 0xffffffff;

	/*
	* Align to multiple of size of minimum base.
	*/

	alignto = max_t(unsigned int, 0x040, size);
	base = ALIGN(io_base, alignto);
	io_base = base + size;
	pci_write_config_dword(dev, reg, base \| PCI_BASE_ADDRESS_SPACE_IO);

	dev->resource[i].start = base;
	dev->resource[i].end = dev->resource[i].start + size - 1;
	dev->resource[i].flags = IORESOURCE_IO \| PCI_BASE_ADDRESS_SPACE_IO;

	DBG_DEVS(("layout_dev: IO address: %lX\n", base));
	}
	else
	{
	unsigned int type;

	/*
	* Memory space base address register.
	*/

	cmd \|= PCI_COMMAND_MEMORY;
	type = base & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
	base &= PCI_BASE_ADDRESS_MEM_MASK;
	mask = (~base << 1) \| 0x1;
	size = (mask & base) & 0xffffffff;
	switch (type)
	{
	case PCI_BASE_ADDRESS_MEM_TYPE_32:
	case PCI_BASE_ADDRESS_MEM_TYPE_64:
	break;

	case PCI_BASE_ADDRESS_MEM_TYPE_1M:
	printk("bios32 WARNING: slot %d, function %d "
	"requests memory below 1MB---don't "
	"know how to do that.\n",
	PCI_SLOT(dev->devfn),
	PCI_FUNC(dev->devfn));
	continue;
	}

	/*
	* Align to multiple of size of minimum base.
	*/

	alignto = max_t(unsigned int, 0x1000, size);
	base = ALIGN(mem_base, alignto);
	mem_base = base + size;
	pci_write_config_dword(dev, reg, base);

	dev->resource[i].start = base;
	dev->resource[i].end = dev->resource[i].start + size - 1;
	dev->resource[i].flags = IORESOURCE_MEM;

	if (type == PCI_BASE_ADDRESS_MEM_TYPE_64)
	{
	/*
	* 64-bit address, set the highest 32 bits
	* to zero.
	*/

	reg += 4;
	pci_write_config_dword(dev, reg, 0);

	i++;
	dev->resource[i].start = 0;
	dev->resource[i].end = 0;
	dev->resource[i].flags = 0;
	}
	}
	}

	/*
	* Enable device:
	*/

	if (dev->class >> 8 == PCI_CLASS_NOT_DEFINED \|\|
	dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA \|\|
	dev->class >> 8 == PCI_CLASS_DISPLAY_VGA \|\|
	dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)
	{
	/*
	* All of these (may) have I/O scattered all around
	* and may not use i/o-base address registers at all.
	* So we just have to always enable I/O to these
	* devices.
	*/
	cmd \|= PCI_COMMAND_IO;
	}

	pci_write_config_word(dev, PCI_COMMAND, cmd \| PCI_COMMAND_MASTER);

	pci_write_config_byte(dev, PCI_LATENCY_TIMER, (disable_pci_burst) ? 0 : 32);

	if (bus_info != NULL)
	bus_info->conf_device(dev); /* Machine dependent configuration. */

	DBG_DEVS(("layout_dev: bus %d slot 0x%x VID 0x%x DID 0x%x class 0x%x\n",
	dev->bus->number, PCI_SLOT(dev->devfn), dev->vendor, dev->device, dev->class));
	}

	/*
	* static void layout_bus(struct pci_bus *bus)
	*
	* Layout memory and I/O for all devices on the given bus.
	*
	* Parameters:
	*
	* bus - bus.
	*/

	static void __init layout_bus(struct pci_bus *bus)
	{
	unsigned int bio, bmem;
	struct pci_dev *dev;

	DBG_DEVS(("layout_bus: starting bus %d\n", bus->number));

	if (!bus->devices && !bus->children)
	return;

	/*
	* Align the current bases on appropriate boundaries (4K for
	* IO and 1MB for memory).
	*/

	bio = io_base = ALIGN(io_base, 4*KB);
	bmem = mem_base = ALIGN(mem_base, 1*MB);

	/*
	* PCI devices might have been setup by a PCI BIOS emulation
	* running under TOS. In these cases there is a
	* window during which two devices may have an overlapping
	* address range. To avoid this causing trouble, we first
	* turn off the I/O and memory address decoders for all PCI
	* devices. They'll be re-enabled only once all address
	* decoders are programmed consistently.
	*/

	DBG_DEVS(("layout_bus: disable_dev for bus %d\n", bus->number));

	for (dev = bus->devices; dev; dev = dev->sibling)
	{
	if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) \|\|
	(dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA))
	disable_dev(dev);
	}

	/*
	* Allocate space to each device:
	*/

	DBG_DEVS(("layout_bus: starting bus %d devices\n", bus->number));

	for (dev = bus->devices; dev; dev = dev->sibling)
	{
	if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) \|\|
	(dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA))
	layout_dev(dev);
	}

	DBG_DEVS(("layout_bus: bus %d finished\n", bus->number));
	}

	/*
	* static void pcibios_fixup(void)
	*
	* Layout memory and I/O of all devices on the PCI bus if 'pci_modify' is
	* true. This might be necessary because not every m68k machine with a PCI
	* bus has a PCI BIOS. This function should be called right after
	* pci_scan_bus() in pcibios_init().
	*/

	static void __init pcibios_fixup(void)
	{
	if (pci_modify)
	{
	/*
	* Set base addresses for allocation of I/O and memory space.
	*/

	io_base = bus_info->io_space.start + IO_ALLOC_OFFSET;
	mem_base = bus_info->mem_space.start + MEM_ALLOC_OFFSET;

	/*
	* Scan the tree, allocating PCI memory and I/O space.
	*/

	layout_bus(pci_bus_b(pci_root.next));
	}

	/*
	* Fix interrupt assignments, etc.
	*/

	bus_info->fixup(pci_modify);
	}

	/*
	* static void pcibios_claim_resources(struct pci_bus *bus)
	*
	* Claim all resources that are assigned to devices on the given bus.
	*
	* Parameters:
	*
	* bus - bus.
	*/

	static void __init pcibios_claim_resources(struct pci_bus *bus)
	{
	struct pci_dev *dev;
	int i;

	while (bus)
	{
	for (dev = bus->devices; (dev != NULL); dev = dev->sibling)
	{
	for (i = 0; i < PCI_NUM_RESOURCES; i++)
	{
	struct resource *r = &dev->resource[i];
	struct resource *pr;
	struct pci_bus_info bus_info = (struct pci_bus_info ) dev->sysdata;

	if ((r->start == 0) \|\| (r->parent != NULL))
	continue;
	#if 1
	if (r->flags & IORESOURCE_IO)
	pr = &bus_info->io_space;
	else
	pr = &bus_info->mem_space;
	#else
	if (r->flags & IORESOURCE_IO)
	pr = &ioport_resource;
	else
	pr = &iomem_resource;
	#endif
	if (request_resource(pr, r) < 0)
	{
	printk(KERN_ERR "PCI: Address space collision on region %d of device %s\n", i, dev->name);
	}
	}
	}

	if (bus->children)
	pcibios_claim_resources(bus->children);

	bus = bus->next;
	}
	}

	/*
	* int pcibios_assign_resource(struct pci_dev *dev, int i)
	*
	* Assign a new address to a PCI resource.
	*
	* Parameters:
	*
	* dev - device.
	* i - resource.
	*
	* Result: 0 if successful.
	*/

	int __init pcibios_assign_resource(struct pci_dev *dev, int i)
	{
	struct resource *r = &dev->resource[i];
	struct resource *pr = pci_find_parent_resource(dev, r);
	unsigned long size = r->end + 1;

	if (!pr)
	return -EINVAL;

	if (r->flags & IORESOURCE_IO)
	{
	if (size > 0x100)
	return -EFBIG;

	if (allocate_resource(pr, r, size, bus_info->io_space.start +
	IO_ALLOC_OFFSET, bus_info->io_space.end, 1024))
	return -EBUSY;
	}
	else
	{
	if (allocate_resource(pr, r, size, bus_info->mem_space.start +
	MEM_ALLOC_OFFSET, bus_info->mem_space.end, size))
	return -EBUSY;
	}

	if (i < 6)
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, r->start);

	return 0;
	}

	void __init pcibios_fixup_bus(struct pci_bus *bus)
	{
	struct pci_dev *dev;
	void *sysdata;

	sysdata = (bus->parent) ? bus->parent->sysdata : bus->sysdata;

	for (dev = bus->devices; (dev != NULL); dev = dev->sibling)
	dev->sysdata = sysdata;
	}

	void __init pcibios_init(void)
	{
	printk("Linux/m68k PCI BIOS32 revision %x.%02x\n", MAJOR_REV, MINOR_REV);

	bus_info = NULL;
	#ifdef CONFIG_HADES
	if (MACH_IS_HADES)
	bus_info = init_hades_pci();
	#endif
	if (bus_info != NULL)
	{
	printk("PCI: Probing PCI hardware\n");
	pci_scan_bus(0, bus_info->m68k_pci_ops, bus_info);
	pcibios_fixup();
	pcibios_claim_resources(pci_root);
	}
	else
	printk("PCI: No PCI bus detected\n");
	}

	char * __init pcibios_setup(char *str)
	{
	if (!strcmp(str, "nomodify"))
	{
	pci_modify = 0;
	return NULL;
	}
	else if (!strcmp(str, "skipvga"))
	{
	skip_vga = 1;
	return NULL;
	}
	else if (!strcmp(str, "noburst"))
	{
	disable_pci_burst = 1;
	return NULL;
	}

	return str;
	}
	#endif /* CONFIG_PCI */