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 | } |
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) |
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; |
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) |
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; |
80 | ||
14d76b68 | 81 | resource_list_for_each_entry(window, &bridge->windows) { |
459f58ce YL |
82 | struct pci_bus_region bus_region; |
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); |