[linux-2.6-block.git] / drivers / pci / host-bridge.c

/*
 * host bridge related code
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/module.h>

#include "pci.h"

static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
{
	while (bus->parent)
		bus = bus->parent;

	return bus;
}

struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
{
	struct pci_bus *root_bus = find_pci_root_bus(bus);

	return to_pci_host_bridge(root_bus->bridge);
}

struct device *pci_get_host_bridge_device(struct pci_dev *dev)
{
	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
	struct device *bridge = root_bus->bridge;

	kobject_get(&bridge->kobj);
	return bridge;
}

void  pci_put_host_bridge_device(struct device *dev)
{
	kobject_put(&dev->kobj);
}

void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
				 void (*release_fn)(struct pci_host_bridge *),
				 void *release_data)
{
	bridge->release_fn = release_fn;
	bridge->release_data = release_data;
}

void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
			     struct resource *res)
{
	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
	struct resource_entry *window;
	resource_size_t offset = 0;

	resource_list_for_each_entry(window, &bridge->windows) {
		if (resource_contains(window->res, res)) {
			offset = window->offset;
			break;
		}
	}

	region->start = res->start - offset;
	region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

static bool region_contains(struct pci_bus_region *region1,
			    struct pci_bus_region *region2)
{
	return region1->start <= region2->start && region1->end >= region2->end;
}

void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
			     struct pci_bus_region *region)
{
	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
	struct resource_entry *window;
	resource_size_t offset = 0;

	resource_list_for_each_entry(window, &bridge->windows) {
		struct pci_bus_region bus_region;

		if (resource_type(res) != resource_type(window->res))
			continue;

		bus_region.start = window->res->start - window->offset;
		bus_region.end = window->res->end - window->offset;

		if (region_contains(&bus_region, region)) {
			offset = window->offset;
			break;
		}
	}

	res->start = region->start + offset;
	res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
Commit	Line	Data
610929e1 YL	1	/*
	2	* host bridge related code
	3	*/
	4
	5	#include <linux/kernel.h>
610929e1 YL	6	#include <linux/pci.h>
	7	#include <linux/module.h>
	8
	9	#include "pci.h"
	10
fc279850	11	static struct pci_bus find_pci_root_bus(struct pci_bus bus)
610929e1	12	{
610929e1 YL	13	while (bus->parent)
	14	bus = bus->parent;
	15
459f58ce YL	16	return bus;
	17	}
	18
3390e085	19	struct pci_host_bridge pci_find_host_bridge(struct pci_bus bus)
459f58ce	20	{
fc279850	21	struct pci_bus *root_bus = find_pci_root_bus(bus);
610929e1	22
fc279850	23	return to_pci_host_bridge(root_bus->bridge);
610929e1 YL	24	}
610929e1 YL	25
6675a601 MK	26	struct device pci_get_host_bridge_device(struct pci_dev dev)
	27	{
	28	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
	29	struct device *bridge = root_bus->bridge;
	30
	31	kobject_get(&bridge->kobj);
	32	return bridge;
	33	}
	34
	35	void pci_put_host_bridge_device(struct device *dev)
	36	{
	37	kobject_put(&dev->kobj);
	38	}
	39
4fa2649a YL	40	void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
	41	void (release_fn)(struct pci_host_bridge ),
	42	void *release_data)
	43	{
	44	bridge->release_fn = release_fn;
	45	bridge->release_data = release_data;
	46	}
	47
fc279850	48	void pcibios_resource_to_bus(struct pci_bus bus, struct pci_bus_region region,
610929e1 YL	49	struct resource *res)
610929e1 YL	50	{
3390e085	51	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	52	struct resource_entry *window;
610929e1 YL	53	resource_size_t offset = 0;
610929e1 YL	54
14d76b68	55	resource_list_for_each_entry(window, &bridge->windows) {
610929e1 YL	56	if (resource_contains(window->res, res)) {
	57	offset = window->offset;
	58	break;
	59	}
	60	}
	61
	62	region->start = res->start - offset;
	63	region->end = res->end - offset;
	64	}
	65	EXPORT_SYMBOL(pcibios_resource_to_bus);
	66
	67	static bool region_contains(struct pci_bus_region *region1,
	68	struct pci_bus_region *region2)
	69	{
	70	return region1->start <= region2->start && region1->end >= region2->end;
	71	}
	72
fc279850	73	void pcibios_bus_to_resource(struct pci_bus bus, struct resource res,
610929e1 YL	74	struct pci_bus_region *region)
610929e1 YL	75	{
3390e085	76	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	77	struct resource_entry *window;
610929e1 YL	78	resource_size_t offset = 0;
610929e1 YL	79
14d76b68	80	resource_list_for_each_entry(window, &bridge->windows) {
459f58ce YL	81	struct pci_bus_region bus_region;
459f58ce YL	82
610929e1 YL	83	if (resource_type(res) != resource_type(window->res))
	84	continue;
	85
	86	bus_region.start = window->res->start - window->offset;
	87	bus_region.end = window->res->end - window->offset;
	88
	89	if (region_contains(&bus_region, region)) {
	90	offset = window->offset;
	91	break;
	92	}
	93	}
	94
	95	res->start = region->start + offset;
	96	res->end = region->end + offset;
	97	}
	98	EXPORT_SYMBOL(pcibios_bus_to_resource);