1 /* 2 * host bridge related code 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/pci.h> 7 #include <linux/module.h> 8 9 #include "pci.h" 10 11 static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) 12 { 13 while (bus->parent) 14 bus = bus->parent; 15 16 return bus; 17 } 18 19 static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus) 20 { 21 struct pci_bus *root_bus = find_pci_root_bus(bus); 22 23 return to_pci_host_bridge(root_bus->bridge); 24 } 25 26 void pci_set_host_bridge_release(struct pci_host_bridge *bridge, 27 void (*release_fn)(struct pci_host_bridge *), 28 void *release_data) 29 { 30 bridge->release_fn = release_fn; 31 bridge->release_data = release_data; 32 } 33 34 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, 35 struct resource *res) 36 { 37 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 38 struct pci_host_bridge_window *window; 39 resource_size_t offset = 0; 40 41 list_for_each_entry(window, &bridge->windows, list) { 42 if (resource_contains(window->res, res)) { 43 offset = window->offset; 44 break; 45 } 46 } 47 48 region->start = res->start - offset; 49 region->end = res->end - offset; 50 } 51 EXPORT_SYMBOL(pcibios_resource_to_bus); 52 53 static bool region_contains(struct pci_bus_region *region1, 54 struct pci_bus_region *region2) 55 { 56 return region1->start <= region2->start && region1->end >= region2->end; 57 } 58 59 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, 60 struct pci_bus_region *region) 61 { 62 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 63 struct pci_host_bridge_window *window; 64 resource_size_t offset = 0; 65 66 list_for_each_entry(window, &bridge->windows, list) { 67 struct pci_bus_region bus_region; 68 69 if (resource_type(res) != resource_type(window->res)) 70 continue; 71 72 bus_region.start = window->res->start - window->offset; 73 bus_region.end = window->res->end - window->offset; 74 75 if (region_contains(&bus_region, region)) { 76 offset = window->offset; 77 break; 78 } 79 } 80 81 res->start = region->start + offset; 82 res->end = region->end + offset; 83 } 84 EXPORT_SYMBOL(pcibios_bus_to_resource); 85