linux/drivers/pci/host-bridge.c
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   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
  12static 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
  23static 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
  30void 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
  38static bool resource_contains(struct resource *res1, struct resource *res2)
  39{
  40        return res1->start <= res2->start && res1->end >= res2->end;
  41}
  42
  43void 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}
  63EXPORT_SYMBOL(pcibios_resource_to_bus);
  64
  65static 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
  71void 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}
  96EXPORT_SYMBOL(pcibios_bus_to_resource);
  97
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