]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * host bridge related code | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/pci.h> | |
7 | #include <linux/module.h> | |
8 | ||
9 | #include "pci.h" | |
10 | ||
11 | static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) | |
12 | { | |
13 | while (bus->parent) | |
14 | bus = bus->parent; | |
15 | ||
16 | return bus; | |
17 | } | |
18 | ||
19 | struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) | |
20 | { | |
21 | struct pci_bus *root_bus = find_pci_root_bus(bus); | |
22 | ||
23 | return to_pci_host_bridge(root_bus->bridge); | |
24 | } | |
25 | ||
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 | ||
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 | EXPORT_SYMBOL_GPL(pci_set_host_bridge_release); | |
48 | ||
49 | void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, | |
50 | struct resource *res) | |
51 | { | |
52 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); | |
53 | struct resource_entry *window; | |
54 | resource_size_t offset = 0; | |
55 | ||
56 | resource_list_for_each_entry(window, &bridge->windows) { | |
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 | ||
74 | void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, | |
75 | struct pci_bus_region *region) | |
76 | { | |
77 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); | |
78 | struct resource_entry *window; | |
79 | resource_size_t offset = 0; | |
80 | ||
81 | resource_list_for_each_entry(window, &bridge->windows) { | |
82 | struct pci_bus_region bus_region; | |
83 | ||
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); |