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98d9f30c BH |
1 | /* |
2 | * PCI <-> OF mapping helpers | |
3 | * | |
4 | * Copyright 2011 IBM Corp. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/pci.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_pci.h> | |
16 | #include "pci.h" | |
17 | ||
18 | void pci_set_of_node(struct pci_dev *dev) | |
19 | { | |
20 | if (!dev->bus->dev.of_node) | |
21 | return; | |
22 | dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node, | |
23 | dev->devfn); | |
24 | } | |
25 | ||
26 | void pci_release_of_node(struct pci_dev *dev) | |
27 | { | |
28 | of_node_put(dev->dev.of_node); | |
29 | dev->dev.of_node = NULL; | |
30 | } | |
31 | ||
32 | void pci_set_bus_of_node(struct pci_bus *bus) | |
33 | { | |
34 | if (bus->self == NULL) | |
35 | bus->dev.of_node = pcibios_get_phb_of_node(bus); | |
36 | else | |
37 | bus->dev.of_node = of_node_get(bus->self->dev.of_node); | |
38 | } | |
39 | ||
40 | void pci_release_bus_of_node(struct pci_bus *bus) | |
41 | { | |
42 | of_node_put(bus->dev.of_node); | |
43 | bus->dev.of_node = NULL; | |
44 | } | |
45 | ||
46 | struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) | |
47 | { | |
48 | /* This should only be called for PHBs */ | |
49 | if (WARN_ON(bus->self || bus->parent)) | |
50 | return NULL; | |
51 | ||
52 | /* Look for a node pointer in either the intermediary device we | |
53 | * create above the root bus or it's own parent. Normally only | |
54 | * the later is populated. | |
55 | */ | |
56 | if (bus->bridge->of_node) | |
57 | return of_node_get(bus->bridge->of_node); | |
69566dd8 | 58 | if (bus->bridge->parent && bus->bridge->parent->of_node) |
98d9f30c BH |
59 | return of_node_get(bus->bridge->parent->of_node); |
60 | return NULL; | |
61 | } |