2 * host bridge related code
5 #include <linux/kernel.h>
7 #include <linux/module.h>
11 static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
19 static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
21 struct pci_bus *root_bus = find_pci_root_bus(bus);
23 return to_pci_host_bridge(root_bus->bridge);
26 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
27 void (*release_fn)(struct pci_host_bridge *),
30 bridge->release_fn = release_fn;
31 bridge->release_data = release_data;
34 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
37 struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
38 struct pci_host_bridge_window *window;
39 resource_size_t offset = 0;
41 list_for_each_entry(window, &bridge->windows, list) {
42 if (resource_contains(window->res, res)) {
43 offset = window->offset;
48 region->start = res->start - offset;
49 region->end = res->end - offset;
51 EXPORT_SYMBOL(pcibios_resource_to_bus);
53 static bool region_contains(struct pci_bus_region *region1,
54 struct pci_bus_region *region2)
56 return region1->start <= region2->start && region1->end >= region2->end;
59 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
60 struct pci_bus_region *region)
62 struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
63 struct pci_host_bridge_window *window;
64 resource_size_t offset = 0;
66 list_for_each_entry(window, &bridge->windows, list) {
67 struct pci_bus_region bus_region;
69 if (resource_type(res) != resource_type(window->res))
72 bus_region.start = window->res->start - window->offset;
73 bus_region.end = window->res->end - window->offset;
75 if (region_contains(&bus_region, region)) {
76 offset = window->offset;
81 res->start = region->start + offset;
82 res->end = region->end + offset;
84 EXPORT_SYMBOL(pcibios_bus_to_resource);