projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 610929e1 YL |
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 LIST_HEAD(pci_host_bridges); | |
| 13 | ||
| 14 | void add_to_pci_host_bridges(struct pci_host_bridge *bridge) | |
| 15 | { | |
| 16 | list_add_tail(&bridge->list, &pci_host_bridges); | |
| 17 | } | |
| 18 | ||
| 19 | static struct pci_host_bridge *pci_host_bridge(struct pci_dev *dev) | |
| 20 | { | |
| 21 | struct pci_bus *bus; | |
| 22 | struct pci_host_bridge *bridge; | |
| 23 | ||
| 24 | bus = dev->bus; | |
| 25 | while (bus->parent) | |
| 26 | bus = bus->parent; | |
| 27 | ||
| 28 | list_for_each_entry(bridge, &pci_host_bridges, list) { | |
| 29 | if (bridge->bus == bus) | |
| 30 | return bridge; | |
| 31 | } | |
| 32 | ||
| 33 | return NULL; | |
| 34 | } | |
| 35 | ||
| 36 | static bool resource_contains(struct resource *res1, struct resource *res2) | |
| 37 | { | |
| 38 | return res1->start <= res2->start && res1->end >= res2->end; | |
| 39 | } | |
| 40 | ||
| 41 | void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, | |
| 42 | struct resource *res) | |
| 43 | { | |
| 44 | struct pci_host_bridge *bridge = pci_host_bridge(dev); | |
| 45 | struct pci_host_bridge_window *window; | |
| 46 | resource_size_t offset = 0; | |
| 47 | ||
| 48 | list_for_each_entry(window, &bridge->windows, list) { | |
| 49 | if (resource_type(res) != resource_type(window->res)) | |
| 50 | continue; | |
| 51 | ||
| 52 | if (resource_contains(window->res, res)) { | |
| 53 | offset = window->offset; | |
| 54 | break; | |
| 55 | } | |
| 56 | } | |
| 57 | ||
| 58 | region->start = res->start - offset; | |
| 59 | region->end = res->end - offset; | |
| 60 | } | |
| 61 | EXPORT_SYMBOL(pcibios_resource_to_bus); | |
| 62 | ||
| 63 | static bool region_contains(struct pci_bus_region *region1, | |
| 64 | struct pci_bus_region *region2) | |
| 65 | { | |
| 66 | return region1->start <= region2->start && region1->end >= region2->end; | |
| 67 | } | |
| 68 | ||
| 69 | void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, | |
| 70 | struct pci_bus_region *region) | |
| 71 | { | |
| 72 | struct pci_host_bridge *bridge = pci_host_bridge(dev); | |
| 73 | struct pci_host_bridge_window *window; | |
| 74 | struct pci_bus_region bus_region; | |
| 75 | resource_size_t offset = 0; | |
| 76 | ||
| 77 | list_for_each_entry(window, &bridge->windows, list) { | |
| 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); |