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 struct pci_host_bridge *pci_find_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 struct device *pci_get_host_bridge_device(struct pci_dev *dev) 27 { 28 struct pci_bus *root_bus = find_pci_root_bus(dev->bus); 29 struct device *bridge = root_bus->bridge; 30 31 kobject_get(&bridge->kobj); 32 return bridge; 33 } 34 35 void pci_put_host_bridge_device(struct device *dev) 36 { 37 kobject_put(&dev->kobj); 38 } 39 40 void pci_set_host_bridge_release(struct pci_host_bridge *bridge, 41 void (*release_fn)(struct pci_host_bridge *), 42 void *release_data) 43 { 44 bridge->release_fn = release_fn; 45 bridge->release_data = release_data; 46 } 47 48 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, 49 struct resource *res) 50 { 51 struct pci_host_bridge *bridge = pci_find_host_bridge(bus); 52 struct resource_entry *window; 53 resource_size_t offset = 0; 54 55 resource_list_for_each_entry(window, &bridge->windows) { 56 if (resource_contains(window->res, res)) { 57 offset = window->offset; 58 break; 59 } 60 } 61 62 region->start = res->start - offset; 63 region->end = res->end - offset; 64 } 65 EXPORT_SYMBOL(pcibios_resource_to_bus); 66 67 static bool region_contains(struct pci_bus_region *region1, 68 struct pci_bus_region *region2) 69 { 70 return region1->start <= region2->start && region1->end >= region2->end; 71 } 72 73 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, 74 struct pci_bus_region *region) 75 { 76 struct pci_host_bridge *bridge = pci_find_host_bridge(bus); 77 struct resource_entry *window; 78 resource_size_t offset = 0; 79 80 resource_list_for_each_entry(window, &bridge->windows) { 81 struct pci_bus_region bus_region; 82 83 if (resource_type(res) != resource_type(window->res)) 84 continue; 85 86 bus_region.start = window->res->start - window->offset; 87 bus_region.end = window->res->end - window->offset; 88 89 if (region_contains(&bus_region, region)) { 90 offset = window->offset; 91 break; 92 } 93 } 94 95 res->start = region->start + offset; 96 res->end = region->end + offset; 97 } 98 EXPORT_SYMBOL(pcibios_bus_to_resource); 99