octeontx2-af: Formatting debugfs entry rsrc_alloc.
[linux-2.6-microblaze.git] / drivers / pci / host-bridge.c
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
12 static 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
20 struct 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
27 struct 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
36 void  pci_put_host_bridge_device(struct device *dev)
37 {
38         kobject_put(&dev->kobj);
39 }
40
41 void 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 }
48 EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
49
50 void 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 }
67 EXPORT_SYMBOL(pcibios_resource_to_bus);
68
69 static 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
75 void 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 }
100 EXPORT_SYMBOL(pcibios_bus_to_resource);