arch/microblaze/pci/pci_32.c - kernel/msm-4.9 - Gitiles

 /*
  * Common pmac/prep/chrp pci routines. -- Cort
  */

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/capability.h>
 #include <linux/sched.h>
 #include <linux/errno.h>
 #include <linux/bootmem.h>
 #include <linux/irq.h>
 #include <linux/list.h>
 #include <linux/of.h>
 #include <linux/slab.h>

 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/sections.h>
 #include <asm/pci-bridge.h>
 #include <asm/byteorder.h>
 #include <asm/uaccess.h>

 #undef DEBUG

 unsigned long isa_io_base;
 unsigned long pci_dram_offset;
 int pcibios_assign_bus_offset = 1;

 static u8 *pci_to_OF_bus_map;

 /* By default, we don't re-assign bus numbers. We do this only on
  * some pmacs
  */
 static int pci_assign_all_buses;

 static int pci_bus_count;

 /*
  * Functions below are used on OpenFirmware machines.
  */
 static void
 make_one_node_map(struct device_node *node, u8 pci_bus)
 {
 	const int *bus_range;
 	int len;

 	if (pci_bus >= pci_bus_count)
 		return;
 	bus_range = of_get_property(node, "bus-range", &len);
 	if (bus_range == NULL || len < 2 * sizeof(int)) {
 		printk(KERN_WARNING "Can't get bus-range for %s, "
 		       "assuming it starts at 0\n", node->full_name);
 		pci_to_OF_bus_map[pci_bus] = 0;
 	} else
 		pci_to_OF_bus_map[pci_bus] = bus_range[0];

 	for_each_child_of_node(node, node) {
 		struct pci_dev *dev;
 		const unsigned int *class_code, *reg;

 		class_code = of_get_property(node, "class-code", NULL);
 		if (!class_code ||
 			((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 			continue;
 		reg = of_get_property(node, "reg", NULL);
 		if (!reg)
 			continue;
 		dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 		if (!dev || !dev->subordinate) {
 			pci_dev_put(dev);
 			continue;
 		}
 		make_one_node_map(node, dev->subordinate->number);
 		pci_dev_put(dev);
 	}
 }

 void
 pcibios_make_OF_bus_map(void)
 {
 	int i;
 	struct pci_controller *hose, *tmp;
 	struct property *map_prop;
 	struct device_node *dn;

 	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 	if (!pci_to_OF_bus_map) {
 		printk(KERN_ERR "Can't allocate OF bus map !\n");
 		return;
 	}

 	/* We fill the bus map with invalid values, that helps
 	 * debugging.
 	 */
 	for (i = 0; i < pci_bus_count; i++)
 		pci_to_OF_bus_map[i] = 0xff;

 	/* For each hose, we begin searching bridges */
 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		struct device_node *node = hose->dn;

 		if (!node)
 			continue;
 		make_one_node_map(node, hose->first_busno);
 	}
 	dn = of_find_node_by_path("/");
 	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 	if (map_prop) {
 		BUG_ON(pci_bus_count > map_prop->length);
 		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 	}
 	of_node_put(dn);
 #ifdef DEBUG
 	printk(KERN_INFO "PCI->OF bus map:\n");
 	for (i = 0; i < pci_bus_count; i++) {
 		if (pci_to_OF_bus_map[i] == 0xff)
 			continue;
 		printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]);
 	}
 #endif
 }

 typedef int (*pci_OF_scan_iterator)(struct device_node *node, void *data);

 static struct device_node *scan_OF_pci_childs(struct device_node *parent,
 					pci_OF_scan_iterator filter, void *data)
 {
 	struct device_node *node;
 	struct device_node *sub_node;

 	for_each_child_of_node(parent, node) {
 		const unsigned int *class_code;

 		if (filter(node, data)) {
 			of_node_put(node);
 			return node;
 		}

 		/* For PCI<->PCI bridges or CardBus bridges, we go down
 		 * Note: some OFs create a parent node "multifunc-device" as
 		 * a fake root for all functions of a multi-function device,
 		 * we go down them as well.
 		 */
 		class_code = of_get_property(node, "class-code", NULL);
 		if ((!class_code ||
 			((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 			strcmp(node->name, "multifunc-device"))
 			continue;
 		sub_node = scan_OF_pci_childs(node, filter, data);
 		if (sub_node) {
 			of_node_put(node);
 			return sub_node;
 		}
 	}
 	return NULL;
 }

 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 					       unsigned int devfn)
 {
 	struct device_node *np, *cnp;
 	const u32 *reg;
 	unsigned int psize;

 	for_each_child_of_node(parent, np) {
 		reg = of_get_property(np, "reg", &psize);
 		if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
 			return np;

 		/* Note: some OFs create a parent node "multifunc-device" as
 		 * a fake root for all functions of a multi-function device,
 		 * we go down them as well. */
 		if (!strcmp(np->name, "multifunc-device")) {
 			cnp = scan_OF_for_pci_dev(np, devfn);
 			if (cnp)
 				return cnp;
 		}
 	}
 	return NULL;
 }


 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 {
 	struct device_node *parent, *np;

 	/* Are we a root bus ? */
 	if (bus->self == NULL || bus->parent == NULL) {
 		struct pci_controller *hose = pci_bus_to_host(bus);
 		if (hose == NULL)
 			return NULL;
 		return of_node_get(hose->dn);
 	}

 	/* not a root bus, we need to get our parent */
 	parent = scan_OF_for_pci_bus(bus->parent);
 	if (parent == NULL)
 		return NULL;

 	/* now iterate for children for a match */
 	np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 	of_node_put(parent);

 	return np;
 }

 /*
  * Scans the OF tree for a device node matching a PCI device
  */
 struct device_node *
 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 {
 	struct device_node *parent, *np;

 	pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 	parent = scan_OF_for_pci_bus(bus);
 	if (parent == NULL)
 		return NULL;
 	pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 	np = scan_OF_for_pci_dev(parent, devfn);
 	of_node_put(parent);
 	pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");

 	/* XXX most callers don't release the returned node
 	 * mostly because ppc64 doesn't increase the refcount,
 	 * we need to fix that.
 	 */
 	return np;
 }
 EXPORT_SYMBOL(pci_busdev_to_OF_node);

 struct device_node*
 pci_device_to_OF_node(struct pci_dev *dev)
 {
 	return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 }
 EXPORT_SYMBOL(pci_device_to_OF_node);

 static int
 find_OF_pci_device_filter(struct device_node *node, void *data)
 {
 	return ((void *)node == data);
 }

 /*
  * Returns the PCI device matching a given OF node
  */
 int
 pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 {
 	const unsigned int *reg;
 	struct pci_controller *hose;
 	struct pci_dev *dev = NULL;

 	/* Make sure it's really a PCI device */
 	hose = pci_find_hose_for_OF_device(node);
 	if (!hose || !hose->dn)
 		return -ENODEV;
 	if (!scan_OF_pci_childs(hose->dn,
 			find_OF_pci_device_filter, (void *)node))
 		return -ENODEV;
 	reg = of_get_property(node, "reg", NULL);
 	if (!reg)
 		return -ENODEV;
 	*bus = (reg[0] >> 16) & 0xff;
 	*devfn = ((reg[0] >> 8) & 0xff);

 	/* Ok, here we need some tweak. If we have already renumbered
 	 * all busses, we can't rely on the OF bus number any more.
 	 * the pci_to_OF_bus_map is not enough as several PCI busses
 	 * may match the same OF bus number.
 	 */
 	if (!pci_to_OF_bus_map)
 		return 0;

 	for_each_pci_dev(dev)
 		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 				dev->devfn == *devfn) {
 			*bus = dev->bus->number;
 			pci_dev_put(dev);
 			return 0;
 		}

 	return -ENODEV;
 }
 EXPORT_SYMBOL(pci_device_from_OF_node);

 /* We create the "pci-OF-bus-map" property now so it appears in the
  * /proc device tree
  */
 void __init
 pci_create_OF_bus_map(void)
 {
 	struct property *of_prop;
 	struct device_node *dn;

 	of_prop = (struct property *) alloc_bootmem(sizeof(struct property) + \
 									 256);
 	if (!of_prop)
 		return;
 	dn = of_find_node_by_path("/");
 	if (dn) {
 		memset(of_prop, -1, sizeof(struct property) + 256);
 		of_prop->name = "pci-OF-bus-map";
 		of_prop->length = 256;
 		of_prop->value = &of_prop[1];
 		prom_add_property(dn, of_prop);
 		of_node_put(dn);
 	}
 }

 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
 {
 	struct pci_bus *bus;
 	struct device_node *node = hose->dn;
 	unsigned long io_offset;
 	struct resource *res = &hose->io_resource;

 	pr_debug("PCI: Scanning PHB %s\n",
 		 node ? node->full_name : "<NO NAME>");

 	/* Create an empty bus for the toplevel */
 	bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
 	if (bus == NULL) {
 		printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
 		       hose->global_number);
 		return;
 	}
 	bus.dev->of_node = of_node_get(node);
 	bus->secondary = hose->first_busno;
 	hose->bus = bus;

 	/* Fixup IO space offset */
 	io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 	res->start = (res->start + io_offset) & 0xffffffffu;
 	res->end = (res->end + io_offset) & 0xffffffffu;

 	/* Wire up PHB bus resources */
 	pcibios_setup_phb_resources(hose);

 	/* Scan children */
 	hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
 }

 static int __init pcibios_init(void)
 {
 	struct pci_controller *hose, *tmp;
 	int next_busno = 0;

 	printk(KERN_INFO "PCI: Probing PCI hardware\n");

 	if (pci_flags & PCI_REASSIGN_ALL_BUS) {
 		printk(KERN_INFO "setting pci_asign_all_busses\n");
 		pci_assign_all_buses = 1;
 	}

 	/* Scan all of the recorded PCI controllers.  */
 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		if (pci_assign_all_buses)
 			hose->first_busno = next_busno;
 		hose->last_busno = 0xff;
 		pcibios_scan_phb(hose);
 		printk(KERN_INFO "calling pci_bus_add_devices()\n");
 		pci_bus_add_devices(hose->bus);
 		if (pci_assign_all_buses || next_busno <= hose->last_busno)
 			next_busno = hose->last_busno + \
 					pcibios_assign_bus_offset;
 	}
 	pci_bus_count = next_busno;

 	/* OpenFirmware based machines need a map of OF bus
 	 * numbers vs. kernel bus numbers since we may have to
 	 * remap them.
 	 */
 	if (pci_assign_all_buses)
 		pcibios_make_OF_bus_map();

 	/* Call common code to handle resource allocation */
 	pcibios_resource_survey();

 	return 0;
 }

 subsys_initcall(pcibios_init);

 static struct pci_controller*
 pci_bus_to_hose(int bus)
 {
 	struct pci_controller *hose, *tmp;

 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 		if (bus >= hose->first_busno && bus <= hose->last_busno)
 			return hose;
 	return NULL;
 }

 /* Provide information on locations of various I/O regions in physical
  * memory.  Do this on a per-card basis so that we choose the right
  * root bridge.
  * Note that the returned IO or memory base is a physical address
  */

 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 {
 	struct pci_controller *hose;
 	long result = -EOPNOTSUPP;

 	hose = pci_bus_to_hose(bus);
 	if (!hose)
 		return -ENODEV;

 	switch (which) {
 	case IOBASE_BRIDGE_NUMBER:
 		return (long)hose->first_busno;
 	case IOBASE_MEMORY:
 		return (long)hose->pci_mem_offset;
 	case IOBASE_IO:
 		return (long)hose->io_base_phys;
 	case IOBASE_ISA_IO:
 		return (long)isa_io_base;
 	case IOBASE_ISA_MEM:
 		return (long)isa_mem_base;
 	}

 	return result;
 }
	/*
	* Common pmac/prep/chrp pci routines. -- Cort
	*/

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/capability.h>
	#include <linux/sched.h>
	#include <linux/errno.h>
	#include <linux/bootmem.h>
	#include <linux/irq.h>
	#include <linux/list.h>
	#include <linux/of.h>
	#include <linux/slab.h>

	#include <asm/processor.h>
	#include <asm/io.h>
	#include <asm/prom.h>
	#include <asm/sections.h>
	#include <asm/pci-bridge.h>
	#include <asm/byteorder.h>
	#include <asm/uaccess.h>

	#undef DEBUG

	unsigned long isa_io_base;
	unsigned long pci_dram_offset;
	int pcibios_assign_bus_offset = 1;

	static u8 *pci_to_OF_bus_map;

	/* By default, we don't re-assign bus numbers. We do this only on
	* some pmacs
	*/
	static int pci_assign_all_buses;

	static int pci_bus_count;

	/*
	* Functions below are used on OpenFirmware machines.
	*/
	static void
	make_one_node_map(struct device_node *node, u8 pci_bus)
	{
	const int *bus_range;
	int len;

	if (pci_bus >= pci_bus_count)
	return;
	bus_range = of_get_property(node, "bus-range", &len);
	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
	printk(KERN_WARNING "Can't get bus-range for %s, "
	"assuming it starts at 0\n", node->full_name);
	pci_to_OF_bus_map[pci_bus] = 0;
	} else
	pci_to_OF_bus_map[pci_bus] = bus_range[0];

	for_each_child_of_node(node, node) {
	struct pci_dev *dev;
	const unsigned int class_code, reg;

	class_code = of_get_property(node, "class-code", NULL);
	if (!class_code \|\|
	((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
	(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
	continue;
	reg = of_get_property(node, "reg", NULL);
	if (!reg)
	continue;
	dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
	if (!dev \|\| !dev->subordinate) {
	pci_dev_put(dev);
	continue;
	}
	make_one_node_map(node, dev->subordinate->number);
	pci_dev_put(dev);
	}
	}

	void
	pcibios_make_OF_bus_map(void)
	{
	int i;
	struct pci_controller hose, tmp;
	struct property *map_prop;
	struct device_node *dn;

	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
	if (!pci_to_OF_bus_map) {
	printk(KERN_ERR "Can't allocate OF bus map !\n");
	return;
	}

	/* We fill the bus map with invalid values, that helps
	* debugging.
	*/
	for (i = 0; i < pci_bus_count; i++)
	pci_to_OF_bus_map[i] = 0xff;

	/* For each hose, we begin searching bridges */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
	struct device_node *node = hose->dn;

	if (!node)
	continue;
	make_one_node_map(node, hose->first_busno);
	}
	dn = of_find_node_by_path("/");
	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
	if (map_prop) {
	BUG_ON(pci_bus_count > map_prop->length);
	memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
	}
	of_node_put(dn);
	#ifdef DEBUG
	printk(KERN_INFO "PCI->OF bus map:\n");
	for (i = 0; i < pci_bus_count; i++) {
	if (pci_to_OF_bus_map[i] == 0xff)
	continue;
	printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]);
	}
	#endif
	}

	typedef int (pci_OF_scan_iterator)(struct device_node node, void *data);

	static struct device_node scan_OF_pci_childs(struct device_node parent,
	pci_OF_scan_iterator filter, void *data)
	{
	struct device_node *node;
	struct device_node *sub_node;

	for_each_child_of_node(parent, node) {
	const unsigned int *class_code;

	if (filter(node, data)) {
	of_node_put(node);
	return node;
	}

	/* For PCI<->PCI bridges or CardBus bridges, we go down
	* Note: some OFs create a parent node "multifunc-device" as
	* a fake root for all functions of a multi-function device,
	* we go down them as well.
	*/
	class_code = of_get_property(node, "class-code", NULL);
	if ((!class_code \|\|
	((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
	(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
	strcmp(node->name, "multifunc-device"))
	continue;
	sub_node = scan_OF_pci_childs(node, filter, data);
	if (sub_node) {
	of_node_put(node);
	return sub_node;
	}
	}
	return NULL;
	}

	static struct device_node scan_OF_for_pci_dev(struct device_node parent,
	unsigned int devfn)
	{
	struct device_node np, cnp;
	const u32 *reg;
	unsigned int psize;

	for_each_child_of_node(parent, np) {
	reg = of_get_property(np, "reg", &psize);
	if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
	return np;

	/* Note: some OFs create a parent node "multifunc-device" as
	* a fake root for all functions of a multi-function device,
	* we go down them as well. */
	if (!strcmp(np->name, "multifunc-device")) {
	cnp = scan_OF_for_pci_dev(np, devfn);
	if (cnp)
	return cnp;
	}
	}
	return NULL;
	}


	static struct device_node scan_OF_for_pci_bus(struct pci_bus bus)
	{
	struct device_node parent, np;

	/* Are we a root bus ? */
	if (bus->self == NULL \|\| bus->parent == NULL) {
	struct pci_controller *hose = pci_bus_to_host(bus);
	if (hose == NULL)
	return NULL;
	return of_node_get(hose->dn);
	}

	/* not a root bus, we need to get our parent */
	parent = scan_OF_for_pci_bus(bus->parent);
	if (parent == NULL)
	return NULL;

	/* now iterate for children for a match */
	np = scan_OF_for_pci_dev(parent, bus->self->devfn);
	of_node_put(parent);

	return np;
	}

	/*
	* Scans the OF tree for a device node matching a PCI device
	*/
	struct device_node *
	pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
	{
	struct device_node parent, np;

	pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
	parent = scan_OF_for_pci_bus(bus);
	if (parent == NULL)
	return NULL;
	pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
	np = scan_OF_for_pci_dev(parent, devfn);
	of_node_put(parent);
	pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");

	/* XXX most callers don't release the returned node
	* mostly because ppc64 doesn't increase the refcount,
	* we need to fix that.
	*/
	return np;
	}
	EXPORT_SYMBOL(pci_busdev_to_OF_node);

	struct device_node*
	pci_device_to_OF_node(struct pci_dev *dev)
	{
	return pci_busdev_to_OF_node(dev->bus, dev->devfn);
	}
	EXPORT_SYMBOL(pci_device_to_OF_node);

	static int
	find_OF_pci_device_filter(struct device_node node, void data)
	{
	return ((void *)node == data);
	}

	/*
	* Returns the PCI device matching a given OF node
	*/
	int
	pci_device_from_OF_node(struct device_node node, u8 bus, u8 *devfn)
	{
	const unsigned int *reg;
	struct pci_controller *hose;
	struct pci_dev *dev = NULL;

	/* Make sure it's really a PCI device */
	hose = pci_find_hose_for_OF_device(node);
	if (!hose \|\| !hose->dn)
	return -ENODEV;
	if (!scan_OF_pci_childs(hose->dn,
	find_OF_pci_device_filter, (void *)node))
	return -ENODEV;
	reg = of_get_property(node, "reg", NULL);
	if (!reg)
	return -ENODEV;
	*bus = (reg[0] >> 16) & 0xff;
	*devfn = ((reg[0] >> 8) & 0xff);

	/* Ok, here we need some tweak. If we have already renumbered
	* all busses, we can't rely on the OF bus number any more.
	* the pci_to_OF_bus_map is not enough as several PCI busses
	* may match the same OF bus number.
	*/
	if (!pci_to_OF_bus_map)
	return 0;

	for_each_pci_dev(dev)
	if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
	dev->devfn == *devfn) {
	*bus = dev->bus->number;
	pci_dev_put(dev);
	return 0;
	}

	return -ENODEV;
	}
	EXPORT_SYMBOL(pci_device_from_OF_node);

	/* We create the "pci-OF-bus-map" property now so it appears in the
	* /proc device tree
	*/
	void __init
	pci_create_OF_bus_map(void)
	{
	struct property *of_prop;
	struct device_node *dn;

	of_prop = (struct property *) alloc_bootmem(sizeof(struct property) + \
	256);
	if (!of_prop)
	return;
	dn = of_find_node_by_path("/");
	if (dn) {
	memset(of_prop, -1, sizeof(struct property) + 256);
	of_prop->name = "pci-OF-bus-map";
	of_prop->length = 256;
	of_prop->value = &of_prop[1];
	prom_add_property(dn, of_prop);
	of_node_put(dn);
	}
	}

	static void __devinit pcibios_scan_phb(struct pci_controller *hose)
	{
	struct pci_bus *bus;
	struct device_node *node = hose->dn;
	unsigned long io_offset;
	struct resource *res = &hose->io_resource;

	pr_debug("PCI: Scanning PHB %s\n",
	node ? node->full_name : "<NO NAME>");

	/* Create an empty bus for the toplevel */
	bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
	if (bus == NULL) {
	printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
	hose->global_number);
	return;
	}
	bus.dev->of_node = of_node_get(node);
	bus->secondary = hose->first_busno;
	hose->bus = bus;

	/* Fixup IO space offset */
	io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
	res->start = (res->start + io_offset) & 0xffffffffu;
	res->end = (res->end + io_offset) & 0xffffffffu;

	/* Wire up PHB bus resources */
	pcibios_setup_phb_resources(hose);

	/* Scan children */
	hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
	}

	static int __init pcibios_init(void)
	{
	struct pci_controller hose, tmp;
	int next_busno = 0;

	printk(KERN_INFO "PCI: Probing PCI hardware\n");

	if (pci_flags & PCI_REASSIGN_ALL_BUS) {
	printk(KERN_INFO "setting pci_asign_all_busses\n");
	pci_assign_all_buses = 1;
	}

	/* Scan all of the recorded PCI controllers. */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
	if (pci_assign_all_buses)
	hose->first_busno = next_busno;
	hose->last_busno = 0xff;
	pcibios_scan_phb(hose);
	printk(KERN_INFO "calling pci_bus_add_devices()\n");
	pci_bus_add_devices(hose->bus);
	if (pci_assign_all_buses \|\| next_busno <= hose->last_busno)
	next_busno = hose->last_busno + \
	pcibios_assign_bus_offset;
	}
	pci_bus_count = next_busno;

	/* OpenFirmware based machines need a map of OF bus
	* numbers vs. kernel bus numbers since we may have to
	* remap them.
	*/
	if (pci_assign_all_buses)
	pcibios_make_OF_bus_map();

	/* Call common code to handle resource allocation */
	pcibios_resource_survey();

	return 0;
	}

	subsys_initcall(pcibios_init);

	static struct pci_controller*
	pci_bus_to_hose(int bus)
	{
	struct pci_controller hose, tmp;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
	if (bus >= hose->first_busno && bus <= hose->last_busno)
	return hose;
	return NULL;
	}

	/* Provide information on locations of various I/O regions in physical
	* memory. Do this on a per-card basis so that we choose the right
	* root bridge.
	* Note that the returned IO or memory base is a physical address
	*/

	long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
	{
	struct pci_controller *hose;
	long result = -EOPNOTSUPP;

	hose = pci_bus_to_hose(bus);
	if (!hose)
	return -ENODEV;

	switch (which) {
	case IOBASE_BRIDGE_NUMBER:
	return (long)hose->first_busno;
	case IOBASE_MEMORY:
	return (long)hose->pci_mem_offset;
	case IOBASE_IO:
	return (long)hose->io_base_phys;
	case IOBASE_ISA_IO:
	return (long)isa_io_base;
	case IOBASE_ISA_MEM:
	return (long)isa_mem_base;
	}

	return result;
	}