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 struct pci_bus *find_pci_root_bus(struct pci_bus *bus) 13 { 14 while (bus->parent) 15 bus = bus->parent; 16 17 return bus; 18 } 19 20 static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus) 21 { 22 struct pci_bus *root_bus = find_pci_root_bus(bus); 23 24 return to_pci_host_bridge(root_bus->bridge); 25 } 26 27 void pci_set_host_bridge_release(struct pci_host_bridge *bridge, 28 void (*release_fn)(struct pci_host_bridge *), 29 void *release_data) 30 { 31 bridge->release_fn = release_fn; 32 bridge->release_data = release_data; 33 } 34 35 static bool resource_contains(struct resource *res1, struct resource *res2) 36 { 37 return res1->start <= res2->start && res1->end >= res2->end; 38 } 39 40 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, 41 struct resource *res) 42 { 43 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 44 struct pci_host_bridge_window *window; 45 resource_size_t offset = 0; 46 47 list_for_each_entry(window, &bridge->windows, list) { 48 if (resource_type(res) != resource_type(window->res)) 49 continue; 50 51 if (resource_contains(window->res, res)) { 52 offset = window->offset; 53 break; 54 } 55 } 56 57 region->start = res->start - offset; 58 region->end = res->end - offset; 59 } 60 EXPORT_SYMBOL(pcibios_resource_to_bus); 61 62 static bool region_contains(struct pci_bus_region *region1, 63 struct pci_bus_region *region2) 64 { 65 return region1->start <= region2->start && region1->end >= region2->end; 66 } 67 68 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, 69 struct pci_bus_region *region) 70 { 71 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 72 struct pci_host_bridge_window *window; 73 resource_size_t offset = 0; 74 75 list_for_each_entry(window, &bridge->windows, list) { 76 struct pci_bus_region bus_region; 77 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); 94