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 struct pci_host_bridge *pci_find_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 struct device *pci_get_host_bridge_device(struct pci_dev *dev)
28 struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
29 struct device *bridge = root_bus->bridge;
31 kobject_get(&bridge->kobj);
35 void pci_put_host_bridge_device(struct device *dev)
37 kobject_put(&dev->kobj);
40 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
41 void (*release_fn)(struct pci_host_bridge *),
44 bridge->release_fn = release_fn;
45 bridge->release_data = release_data;
47 EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
49 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
52 struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
53 struct resource_entry *window;
54 resource_size_t offset = 0;
56 resource_list_for_each_entry(window, &bridge->windows) {
57 if (resource_contains(window->res, res)) {
58 offset = window->offset;
63 region->start = res->start - offset;
64 region->end = res->end - offset;
66 EXPORT_SYMBOL(pcibios_resource_to_bus);
68 static bool region_contains(struct pci_bus_region *region1,
69 struct pci_bus_region *region2)
71 return region1->start <= region2->start && region1->end >= region2->end;
74 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
75 struct pci_bus_region *region)
77 struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
78 struct resource_entry *window;
79 resource_size_t offset = 0;
81 resource_list_for_each_entry(window, &bridge->windows) {
82 struct pci_bus_region bus_region;
84 if (resource_type(res) != resource_type(window->res))
87 bus_region.start = window->res->start - window->offset;
88 bus_region.end = window->res->end - window->offset;
90 if (region_contains(&bus_region, region)) {
91 offset = window->offset;
96 res->start = region->start + offset;
97 res->end = region->end + offset;
99 EXPORT_SYMBOL(pcibios_bus_to_resource);