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_dev *dev) 13 { 14 struct pci_bus *bus; 15 16 bus = dev->bus; 17 while (bus->parent) 18 bus = bus->parent; 19 20 return bus; 21 } 22 23 static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev) 24 { 25 struct pci_bus *bus = find_pci_root_bus(dev); 26 27 return to_pci_host_bridge(bus->bridge); 28 } 29 30 void pci_set_host_bridge_release(struct pci_host_bridge *bridge, 31 void (*release_fn)(struct pci_host_bridge *), 32 void *release_data) 33 { 34 bridge->release_fn = release_fn; 35 bridge->release_data = release_data; 36 } 37 38 static bool resource_contains(struct resource *res1, struct resource *res2) 39 { 40 return res1->start <= res2->start && res1->end >= res2->end; 41 } 42 43 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, 44 struct resource *res) 45 { 46 struct pci_host_bridge *bridge = find_pci_host_bridge(dev); 47 struct pci_host_bridge_window *window; 48 resource_size_t offset = 0; 49 50 list_for_each_entry(window, &bridge->windows, list) { 51 if (resource_type(res) != resource_type(window->res)) 52 continue; 53 54 if (resource_contains(window->res, res)) { 55 offset = window->offset; 56 break; 57 } 58 } 59 60 region->start = res->start - offset; 61 region->end = res->end - offset; 62 } 63 EXPORT_SYMBOL(pcibios_resource_to_bus); 64 65 static bool region_contains(struct pci_bus_region *region1, 66 struct pci_bus_region *region2) 67 { 68 return region1->start <= region2->start && region1->end >= region2->end; 69 } 70 71 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, 72 struct pci_bus_region *region) 73 { 74 struct pci_host_bridge *bridge = find_pci_host_bridge(dev); 75 struct pci_host_bridge_window *window; 76 resource_size_t offset = 0; 77 78 list_for_each_entry(window, &bridge->windows, list) { 79 struct pci_bus_region bus_region; 80 81 if (resource_type(res) != resource_type(window->res)) 82 continue; 83 84 bus_region.start = window->res->start - window->offset; 85 bus_region.end = window->res->end - window->offset; 86 87 if (region_contains(&bus_region, region)) { 88 offset = window->offset; 89 break; 90 } 91 } 92 93 res->start = region->start + offset; 94 res->end = region->end + offset; 95 } 96 EXPORT_SYMBOL(pcibios_bus_to_resource); 97