Commit | Line | Data |
---|---|---|
610929e1 YL |
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 | ||
459f58ce | 12 | static struct pci_bus *find_pci_root_bus(struct pci_dev *dev) |
610929e1 YL |
13 | { |
14 | struct pci_bus *bus; | |
610929e1 YL |
15 | |
16 | bus = dev->bus; | |
17 | while (bus->parent) | |
18 | bus = bus->parent; | |
19 | ||
459f58ce YL |
20 | return bus; |
21 | } | |
22 | ||
23 | static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev) | |
24 | { | |
25 | struct pci_bus *bus = find_pci_root_bus(dev); | |
610929e1 | 26 | |
7b543663 | 27 | return to_pci_host_bridge(bus->bridge); |
610929e1 YL |
28 | } |
29 | ||
30 | static bool resource_contains(struct resource *res1, struct resource *res2) | |
31 | { | |
32 | return res1->start <= res2->start && res1->end >= res2->end; | |
33 | } | |
34 | ||
35 | void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, | |
36 | struct resource *res) | |
37 | { | |
459f58ce | 38 | struct pci_host_bridge *bridge = find_pci_host_bridge(dev); |
610929e1 YL |
39 | struct pci_host_bridge_window *window; |
40 | resource_size_t offset = 0; | |
41 | ||
42 | list_for_each_entry(window, &bridge->windows, list) { | |
43 | if (resource_type(res) != resource_type(window->res)) | |
44 | continue; | |
45 | ||
46 | if (resource_contains(window->res, res)) { | |
47 | offset = window->offset; | |
48 | break; | |
49 | } | |
50 | } | |
51 | ||
52 | region->start = res->start - offset; | |
53 | region->end = res->end - offset; | |
54 | } | |
55 | EXPORT_SYMBOL(pcibios_resource_to_bus); | |
56 | ||
57 | static bool region_contains(struct pci_bus_region *region1, | |
58 | struct pci_bus_region *region2) | |
59 | { | |
60 | return region1->start <= region2->start && region1->end >= region2->end; | |
61 | } | |
62 | ||
63 | void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, | |
64 | struct pci_bus_region *region) | |
65 | { | |
459f58ce | 66 | struct pci_host_bridge *bridge = find_pci_host_bridge(dev); |
610929e1 | 67 | struct pci_host_bridge_window *window; |
610929e1 YL |
68 | resource_size_t offset = 0; |
69 | ||
70 | list_for_each_entry(window, &bridge->windows, list) { | |
459f58ce YL |
71 | struct pci_bus_region bus_region; |
72 | ||
610929e1 YL |
73 | if (resource_type(res) != resource_type(window->res)) |
74 | continue; | |
75 | ||
76 | bus_region.start = window->res->start - window->offset; | |
77 | bus_region.end = window->res->end - window->offset; | |
78 | ||
79 | if (region_contains(&bus_region, region)) { | |
80 | offset = window->offset; | |
81 | break; | |
82 | } | |
83 | } | |
84 | ||
85 | res->start = region->start + offset; | |
86 | res->end = region->end + offset; | |
87 | } | |
88 | EXPORT_SYMBOL(pcibios_bus_to_resource); |