1/*
 2 * host bridge related code
 3 */
 4
 5#include <linux/kernel.h>
 6#include <linux/init.h>
 7#include <linux/pci.h>
 8#include <linux/module.h>
 9
10#include "pci.h"
11
12static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
13{
14	struct pci_bus *bus;
15
16	bus = dev->bus;
17	while (bus->parent)
18		bus = bus->parent;
19
20	return bus;
21}
22
23static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
24{
25	struct pci_bus *bus = find_pci_root_bus(dev);
26
27	return to_pci_host_bridge(bus->bridge);
28}
29
30void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
31				 void (*release_fn)(struct pci_host_bridge *),
32				 void *release_data)
33{
34	bridge->release_fn = release_fn;
35	bridge->release_data = release_data;
36}
37
38static bool resource_contains(struct resource *res1, struct resource *res2)
39{
40	return res1->start <= res2->start && res1->end >= res2->end;
41}
42
43void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
44			     struct resource *res)
45{
46	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
47	struct pci_host_bridge_window *window;
48	resource_size_t offset = 0;
49
50	list_for_each_entry(window, &bridge->windows, list) {
51		if (resource_type(res) != resource_type(window->res))
52			continue;
53
54		if (resource_contains(window->res, res)) {
55			offset = window->offset;
56			break;
57		}
58	}
59
60	region->start = res->start - offset;
61	region->end = res->end - offset;
62}
63EXPORT_SYMBOL(pcibios_resource_to_bus);
64
65static bool region_contains(struct pci_bus_region *region1,
66			    struct pci_bus_region *region2)
67{
68	return region1->start <= region2->start && region1->end >= region2->end;
69}
70
71void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
72			     struct pci_bus_region *region)
73{
74	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
75	struct pci_host_bridge_window *window;
76	resource_size_t offset = 0;
77
78	list_for_each_entry(window, &bridge->windows, list) {
79		struct pci_bus_region bus_region;
80
81		if (resource_type(res) != resource_type(window->res))
82			continue;
83
84		bus_region.start = window->res->start - window->offset;
85		bus_region.end = window->res->end - window->offset;
86
87		if (region_contains(&bus_region, region)) {
88			offset = window->offset;
89			break;
90		}
91	}
92
93	res->start = region->start + offset;
94	res->end = region->end + offset;
95}
96EXPORT_SYMBOL(pcibios_bus_to_resource);