[mirror_ubuntu-zesty-kernel.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;
}
EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);

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	}
6f38a8b9	47	EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
4fa2649a	48
fc279850	49	void pcibios_resource_to_bus(struct pci_bus bus, struct pci_bus_region region,
610929e1 YL	50	struct resource *res)
610929e1 YL	51	{
3390e085	52	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	53	struct resource_entry *window;
610929e1 YL	54	resource_size_t offset = 0;
610929e1 YL	55
14d76b68	56	resource_list_for_each_entry(window, &bridge->windows) {
610929e1 YL	57	if (resource_contains(window->res, res)) {
	58	offset = window->offset;
	59	break;
	60	}
	61	}
	62
	63	region->start = res->start - offset;
	64	region->end = res->end - offset;
	65	}
	66	EXPORT_SYMBOL(pcibios_resource_to_bus);
	67
	68	static bool region_contains(struct pci_bus_region *region1,
	69	struct pci_bus_region *region2)
	70	{
	71	return region1->start <= region2->start && region1->end >= region2->end;
	72	}
	73
fc279850	74	void pcibios_bus_to_resource(struct pci_bus bus, struct resource res,
610929e1 YL	75	struct pci_bus_region *region)
610929e1 YL	76	{
3390e085	77	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
14d76b68	78	struct resource_entry *window;
610929e1 YL	79	resource_size_t offset = 0;
610929e1 YL	80
14d76b68	81	resource_list_for_each_entry(window, &bridge->windows) {
459f58ce YL	82	struct pci_bus_region bus_region;
459f58ce YL	83
610929e1 YL	84	if (resource_type(res) != resource_type(window->res))
	85	continue;
	86
	87	bus_region.start = window->res->start - window->offset;
	88	bus_region.end = window->res->end - window->offset;
	89
	90	if (region_contains(&bus_region, region)) {
	91	offset = window->offset;
	92	break;
	93	}
	94	}
	95
	96	res->start = region->start + offset;
	97	res->end = region->end + offset;
	98	}
	99	EXPORT_SYMBOL(pcibios_bus_to_resource);