1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Host bridge related code
  4 */
  5
  6#include <linux/kernel.h>
  7#include <linux/pci.h>
  8#include <linux/module.h>
  9
 10#include "pci.h"
 11
 12static 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
 20struct pci_host_bridge *pci_find_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}
 26EXPORT_SYMBOL_GPL(pci_find_host_bridge);
 27
 28struct device *pci_get_host_bridge_device(struct pci_dev *dev)
 29{
 30	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
 31	struct device *bridge = root_bus->bridge;
 32
 33	kobject_get(&bridge->kobj);
 34	return bridge;
 35}
 36
 37void  pci_put_host_bridge_device(struct device *dev)
 38{
 39	kobject_put(&dev->kobj);
 40}
 41
 42void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
 43				 void (*release_fn)(struct pci_host_bridge *),
 44				 void *release_data)
 45{
 46	bridge->release_fn = release_fn;
 47	bridge->release_data = release_data;
 48}
 49EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
 50
 51void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
 52			     struct resource *res)
 53{
 54	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
 55	struct resource_entry *window;
 56	resource_size_t offset = 0;
 57
 58	resource_list_for_each_entry(window, &bridge->windows) {
 59		if (resource_contains(window->res, res)) {
 60			offset = window->offset;
 61			break;
 62		}
 63	}
 64
 65	region->start = res->start - offset;
 66	region->end = res->end - offset;
 67}
 68EXPORT_SYMBOL(pcibios_resource_to_bus);
 69
 70static bool region_contains(struct pci_bus_region *region1,
 71			    struct pci_bus_region *region2)
 72{
 73	return region1->start <= region2->start && region1->end >= region2->end;
 74}
 75
 76void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
 77			     struct pci_bus_region *region)
 78{
 79	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
 80	struct resource_entry *window;
 81	resource_size_t offset = 0;
 82
 83	resource_list_for_each_entry(window, &bridge->windows) {
 84		struct pci_bus_region bus_region;
 85
 86		if (resource_type(res) != resource_type(window->res))
 87			continue;
 88
 89		bus_region.start = window->res->start - window->offset;
 90		bus_region.end = window->res->end - window->offset;
 91
 92		if (region_contains(&bus_region, region)) {
 93			offset = window->offset;
 94			break;
 95		}
 96	}
 97
 98	res->start = region->start + offset;
 99	res->end = region->end + offset;
100}
101EXPORT_SYMBOL(pcibios_bus_to_resource);

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Host bridge related code
  4 */
  5
  6#include <linux/kernel.h>
  7#include <linux/pci.h>
  8#include <linux/module.h>
  9
 10#include "pci.h"
 11
 12static 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
 20struct pci_host_bridge *pci_find_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}
 26EXPORT_SYMBOL_GPL(pci_find_host_bridge);
 27
 28struct device *pci_get_host_bridge_device(struct pci_dev *dev)
 29{
 30	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
 31	struct device *bridge = root_bus->bridge;
 32
 33	kobject_get(&bridge->kobj);
 34	return bridge;
 35}
 36
 37void  pci_put_host_bridge_device(struct device *dev)
 38{
 39	kobject_put(&dev->kobj);
 40}
 41
 42void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
 43				 void (*release_fn)(struct pci_host_bridge *),
 44				 void *release_data)
 45{
 46	bridge->release_fn = release_fn;
 47	bridge->release_data = release_data;
 48}
 49EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
 50
 51void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
 52			     struct resource *res)
 53{
 54	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
 55	struct resource_entry *window;
 56	resource_size_t offset = 0;
 57
 58	resource_list_for_each_entry(window, &bridge->windows) {
 59		if (resource_contains(window->res, res)) {
 60			offset = window->offset;
 61			break;
 62		}
 63	}
 64
 65	region->start = res->start - offset;
 66	region->end = res->end - offset;
 67}
 68EXPORT_SYMBOL(pcibios_resource_to_bus);
 69
 70static bool region_contains(struct pci_bus_region *region1,
 71			    struct pci_bus_region *region2)
 72{
 73	return region1->start <= region2->start && region1->end >= region2->end;
 74}
 75
 76void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
 77			     struct pci_bus_region *region)
 78{
 79	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
 80	struct resource_entry *window;
 81	resource_size_t offset = 0;
 82
 83	resource_list_for_each_entry(window, &bridge->windows) {
 84		struct pci_bus_region bus_region;
 85
 86		if (resource_type(res) != resource_type(window->res))
 87			continue;
 88
 89		bus_region.start = window->res->start - window->offset;
 90		bus_region.end = window->res->end - window->offset;
 91
 92		if (region_contains(&bus_region, region)) {
 93			offset = window->offset;
 94			break;
 95		}
 96	}
 97
 98	res->start = region->start + offset;
 99	res->end = region->end + offset;
100}
101EXPORT_SYMBOL(pcibios_bus_to_resource);