diff options
Diffstat (limited to 'drivers/pci/host-bridge.c')
-rw-r--r-- | drivers/pci/host-bridge.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c new file mode 100644 index 0000000000..afa50b4465 --- /dev/null +++ b/drivers/pci/host-bridge.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Host bridge related code + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/module.h> + +#include "pci.h" + +static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) +{ + while (bus->parent) + bus = bus->parent; + + return bus; +} + +struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) +{ + struct pci_bus *root_bus = find_pci_root_bus(bus); + + return to_pci_host_bridge(root_bus->bridge); +} +EXPORT_SYMBOL_GPL(pci_find_host_bridge); + +struct device *pci_get_host_bridge_device(struct pci_dev *dev) +{ + struct pci_bus *root_bus = find_pci_root_bus(dev->bus); + struct device *bridge = root_bus->bridge; + + kobject_get(&bridge->kobj); + return bridge; +} + +void pci_put_host_bridge_device(struct device *dev) +{ + kobject_put(&dev->kobj); +} + +void pci_set_host_bridge_release(struct pci_host_bridge *bridge, + void (*release_fn)(struct pci_host_bridge *), + void *release_data) +{ + bridge->release_fn = release_fn; + bridge->release_data = release_data; +} +EXPORT_SYMBOL_GPL(pci_set_host_bridge_release); + +void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, + struct resource *res) +{ + struct pci_host_bridge *bridge = pci_find_host_bridge(bus); + struct resource_entry *window; + resource_size_t offset = 0; + + resource_list_for_each_entry(window, &bridge->windows) { + if (resource_contains(window->res, res)) { + offset = window->offset; + break; + } + } + + region->start = res->start - offset; + region->end = res->end - offset; +} +EXPORT_SYMBOL(pcibios_resource_to_bus); + +static bool region_contains(struct pci_bus_region *region1, + struct pci_bus_region *region2) +{ + return region1->start <= region2->start && region1->end >= region2->end; +} + +void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, + struct pci_bus_region *region) +{ + struct pci_host_bridge *bridge = pci_find_host_bridge(bus); + struct resource_entry *window; + resource_size_t offset = 0; + + resource_list_for_each_entry(window, &bridge->windows) { + struct pci_bus_region bus_region; + + if (resource_type(res) != resource_type(window->res)) + continue; + + bus_region.start = window->res->start - window->offset; + bus_region.end = window->res->end - window->offset; + + if (region_contains(&bus_region, region)) { + offset = window->offset; + break; + } + } + + res->start = region->start + offset; + res->end = region->end + offset; +} +EXPORT_SYMBOL(pcibios_bus_to_resource); |