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Commit | Line | Data |
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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 | ||
12 | static LIST_HEAD(pci_host_bridges); | |
13 | ||
14 | void add_to_pci_host_bridges(struct pci_host_bridge *bridge) | |
15 | { | |
16 | list_add_tail(&bridge->list, &pci_host_bridges); | |
17 | } | |
18 | ||
19 | static struct pci_host_bridge *pci_host_bridge(struct pci_dev *dev) | |
20 | { | |
21 | struct pci_bus *bus; | |
22 | struct pci_host_bridge *bridge; | |
23 | ||
24 | bus = dev->bus; | |
25 | while (bus->parent) | |
26 | bus = bus->parent; | |
27 | ||
28 | list_for_each_entry(bridge, &pci_host_bridges, list) { | |
29 | if (bridge->bus == bus) | |
30 | return bridge; | |
31 | } | |
32 | ||
33 | return NULL; | |
34 | } | |
35 | ||
36 | static bool resource_contains(struct resource *res1, struct resource *res2) | |
37 | { | |
38 | return res1->start <= res2->start && res1->end >= res2->end; | |
39 | } | |
40 | ||
41 | void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, | |
42 | struct resource *res) | |
43 | { | |
44 | struct pci_host_bridge *bridge = pci_host_bridge(dev); | |
45 | struct pci_host_bridge_window *window; | |
46 | resource_size_t offset = 0; | |
47 | ||
48 | list_for_each_entry(window, &bridge->windows, list) { | |
49 | if (resource_type(res) != resource_type(window->res)) | |
50 | continue; | |
51 | ||
52 | if (resource_contains(window->res, res)) { | |
53 | offset = window->offset; | |
54 | break; | |
55 | } | |
56 | } | |
57 | ||
58 | region->start = res->start - offset; | |
59 | region->end = res->end - offset; | |
60 | } | |
61 | EXPORT_SYMBOL(pcibios_resource_to_bus); | |
62 | ||
63 | static bool region_contains(struct pci_bus_region *region1, | |
64 | struct pci_bus_region *region2) | |
65 | { | |
66 | return region1->start <= region2->start && region1->end >= region2->end; | |
67 | } | |
68 | ||
69 | void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, | |
70 | struct pci_bus_region *region) | |
71 | { | |
72 | struct pci_host_bridge *bridge = pci_host_bridge(dev); | |
73 | struct pci_host_bridge_window *window; | |
74 | struct pci_bus_region bus_region; | |
75 | resource_size_t offset = 0; | |
76 | ||
77 | list_for_each_entry(window, &bridge->windows, list) { | |
78 | if (resource_type(res) != resource_type(window->res)) | |
79 | continue; | |
80 | ||
81 | bus_region.start = window->res->start - window->offset; | |
82 | bus_region.end = window->res->end - window->offset; | |
83 | ||
84 | if (region_contains(&bus_region, region)) { | |
85 | offset = window->offset; | |
86 | break; | |
87 | } | |
88 | } | |
89 | ||
90 | res->start = region->start + offset; | |
91 | res->end = region->end + offset; | |
92 | } | |
93 | EXPORT_SYMBOL(pcibios_bus_to_resource); |