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

 
 1/*
 2 * host bridge related code
 3 */
 4
 5#include <linux/kernel.h>
 6#include <linux/pci.h>
 7#include <linux/module.h>
 8
 9#include "pci.h"
10
11static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
12{
13	while (bus->parent)
14		bus = bus->parent;
15
16	return bus;
17}
18
19struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
20{
21	struct pci_bus *root_bus = find_pci_root_bus(bus);
22
23	return to_pci_host_bridge(root_bus->bridge);
24}
25
26struct device *pci_get_host_bridge_device(struct pci_dev *dev)
27{
28	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
29	struct device *bridge = root_bus->bridge;
30
31	kobject_get(&bridge->kobj);
32	return bridge;
33}
34
35void  pci_put_host_bridge_device(struct device *dev)
36{
37	kobject_put(&dev->kobj);
38}
39
40void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
41				 void (*release_fn)(struct pci_host_bridge *),
42				 void *release_data)
43{
44	bridge->release_fn = release_fn;
45	bridge->release_data = release_data;
46}
 
47
48void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
49			     struct resource *res)
50{
51	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
52	struct resource_entry *window;
53	resource_size_t offset = 0;
54
55	resource_list_for_each_entry(window, &bridge->windows) {
56		if (resource_contains(window->res, res)) {
57			offset = window->offset;
58			break;
59		}
60	}
61
62	region->start = res->start - offset;
63	region->end = res->end - offset;
64}
65EXPORT_SYMBOL(pcibios_resource_to_bus);
66
67static bool region_contains(struct pci_bus_region *region1,
68			    struct pci_bus_region *region2)
69{
70	return region1->start <= region2->start && region1->end >= region2->end;
71}
72
73void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
74			     struct pci_bus_region *region)
75{
76	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
77	struct resource_entry *window;
78	resource_size_t offset = 0;
79
80	resource_list_for_each_entry(window, &bridge->windows) {
81		struct pci_bus_region bus_region;
82
83		if (resource_type(res) != resource_type(window->res))
84			continue;
85
86		bus_region.start = window->res->start - window->offset;
87		bus_region.end = window->res->end - window->offset;
88
89		if (region_contains(&bus_region, region)) {
90			offset = window->offset;
91			break;
92		}
93	}
94
95	res->start = region->start + offset;
96	res->end = region->end + offset;
97}
98EXPORT_SYMBOL(pcibios_bus_to_resource);