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 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, 36 struct resource *res) 37 { 38 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 39 struct pci_host_bridge_window *window; 40 resource_size_t offset = 0; 41 42 list_for_each_entry(window, &bridge->windows, list) { 43 if (resource_contains(window->res, res)) { 44 offset = window->offset; 45 break; 46 } 47 } 48 49 region->start = res->start - offset; 50 region->end = res->end - offset; 51 } 52 EXPORT_SYMBOL(pcibios_resource_to_bus); 53 54 static bool region_contains(struct pci_bus_region *region1, 55 struct pci_bus_region *region2) 56 { 57 return region1->start <= region2->start && region1->end >= region2->end; 58 } 59 60 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, 61 struct pci_bus_region *region) 62 { 63 struct pci_host_bridge *bridge = find_pci_host_bridge(bus); 64 struct pci_host_bridge_window *window; 65 resource_size_t offset = 0; 66 67 list_for_each_entry(window, &bridge->windows, list) { 68 struct pci_bus_region bus_region; 69 70 if (resource_type(res) != resource_type(window->res)) 71 continue; 72 73 bus_region.start = window->res->start - window->offset; 74 bus_region.end = window->res->end - window->offset; 75 76 if (region_contains(&bus_region, region)) { 77 offset = window->offset; 78 break; 79 } 80 } 81 82 res->start = region->start + offset; 83 res->end = region->end + offset; 84 } 85 EXPORT_SYMBOL(pcibios_bus_to_resource); 86