Commit | Line | Data |
---|---|---|
7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
610929e1 | 2 | /* |
df62ab5e | 3 | * Host bridge related code |
610929e1 YL |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
610929e1 YL |
7 | #include <linux/pci.h> |
8 | #include <linux/module.h> | |
9 | ||
10 | #include "pci.h" | |
11 | ||
fc279850 | 12 | static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) |
610929e1 | 13 | { |
610929e1 YL |
14 | while (bus->parent) |
15 | bus = bus->parent; | |
16 | ||
459f58ce YL |
17 | return bus; |
18 | } | |
19 | ||
3390e085 | 20 | struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) |
459f58ce | 21 | { |
fc279850 | 22 | struct pci_bus *root_bus = find_pci_root_bus(bus); |
610929e1 | 23 | |
fc279850 | 24 | return to_pci_host_bridge(root_bus->bridge); |
610929e1 YL |
25 | } |
26 | ||
6675a601 MK |
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 | ||
4fa2649a YL |
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 | } | |
6f38a8b9 | 48 | EXPORT_SYMBOL_GPL(pci_set_host_bridge_release); |
4fa2649a | 49 | |
fc279850 | 50 | void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, |
610929e1 YL |
51 | struct resource *res) |
52 | { | |
3390e085 | 53 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
14d76b68 | 54 | struct resource_entry *window; |
610929e1 YL |
55 | resource_size_t offset = 0; |
56 | ||
14d76b68 | 57 | resource_list_for_each_entry(window, &bridge->windows) { |
610929e1 YL |
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 | ||
fc279850 | 75 | void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, |
610929e1 YL |
76 | struct pci_bus_region *region) |
77 | { | |
3390e085 | 78 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
14d76b68 | 79 | struct resource_entry *window; |
610929e1 YL |
80 | resource_size_t offset = 0; |
81 | ||
14d76b68 | 82 | resource_list_for_each_entry(window, &bridge->windows) { |
459f58ce YL |
83 | struct pci_bus_region bus_region; |
84 | ||
610929e1 YL |
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); |