1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Host bridge related code
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/kernel.h>
7*4882a593Smuzhiyun #include <linux/pci.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "pci.h"
11*4882a593Smuzhiyun
find_pci_root_bus(struct pci_bus * bus)12*4882a593Smuzhiyun static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun while (bus->parent)
15*4882a593Smuzhiyun bus = bus->parent;
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun return bus;
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
pci_find_host_bridge(struct pci_bus * bus)20*4882a593Smuzhiyun struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct pci_bus *root_bus = find_pci_root_bus(bus);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun return to_pci_host_bridge(root_bus->bridge);
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
pci_get_host_bridge_device(struct pci_dev * dev)27*4882a593Smuzhiyun struct device *pci_get_host_bridge_device(struct pci_dev *dev)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
30*4882a593Smuzhiyun struct device *bridge = root_bus->bridge;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun kobject_get(&bridge->kobj);
33*4882a593Smuzhiyun return bridge;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
pci_put_host_bridge_device(struct device * dev)36*4882a593Smuzhiyun void pci_put_host_bridge_device(struct device *dev)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun kobject_put(&dev->kobj);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
pci_set_host_bridge_release(struct pci_host_bridge * bridge,void (* release_fn)(struct pci_host_bridge *),void * release_data)41*4882a593Smuzhiyun void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
42*4882a593Smuzhiyun void (*release_fn)(struct pci_host_bridge *),
43*4882a593Smuzhiyun void *release_data)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun bridge->release_fn = release_fn;
46*4882a593Smuzhiyun bridge->release_data = release_data;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
49*4882a593Smuzhiyun
pcibios_resource_to_bus(struct pci_bus * bus,struct pci_bus_region * region,struct resource * res)50*4882a593Smuzhiyun void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
51*4882a593Smuzhiyun struct resource *res)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
54*4882a593Smuzhiyun struct resource_entry *window;
55*4882a593Smuzhiyun resource_size_t offset = 0;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun resource_list_for_each_entry(window, &bridge->windows) {
58*4882a593Smuzhiyun if (resource_contains(window->res, res)) {
59*4882a593Smuzhiyun offset = window->offset;
60*4882a593Smuzhiyun break;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun region->start = res->start - offset;
65*4882a593Smuzhiyun region->end = res->end - offset;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun EXPORT_SYMBOL(pcibios_resource_to_bus);
68*4882a593Smuzhiyun
region_contains(struct pci_bus_region * region1,struct pci_bus_region * region2)69*4882a593Smuzhiyun static bool region_contains(struct pci_bus_region *region1,
70*4882a593Smuzhiyun struct pci_bus_region *region2)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun return region1->start <= region2->start && region1->end >= region2->end;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
pcibios_bus_to_resource(struct pci_bus * bus,struct resource * res,struct pci_bus_region * region)75*4882a593Smuzhiyun void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
76*4882a593Smuzhiyun struct pci_bus_region *region)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
79*4882a593Smuzhiyun struct resource_entry *window;
80*4882a593Smuzhiyun resource_size_t offset = 0;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun resource_list_for_each_entry(window, &bridge->windows) {
83*4882a593Smuzhiyun struct pci_bus_region bus_region;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun if (resource_type(res) != resource_type(window->res))
86*4882a593Smuzhiyun continue;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun bus_region.start = window->res->start - window->offset;
89*4882a593Smuzhiyun bus_region.end = window->res->end - window->offset;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun if (region_contains(&bus_region, region)) {
92*4882a593Smuzhiyun offset = window->offset;
93*4882a593Smuzhiyun break;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun res->start = region->start + offset;
98*4882a593Smuzhiyun res->end = region->end + offset;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun EXPORT_SYMBOL(pcibios_bus_to_resource);
101