blob: c94d37ec55c87af38e7b6d1c9ccf46ea9baeb60c [file] [log] [blame]
Benjamin Herrenschmidt98d9f30c82011-04-11 11:37:07 +10001/*
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
18void 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
26void 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
32void 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
40void 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
46struct 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);
58 if (bus->bridge->parent->of_node)
59 return of_node_get(bus->bridge->parent->of_node);
60 return NULL;
61}