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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
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 && bus->bridge->parent->of_node)
59		return of_node_get(bus->bridge->parent->of_node);
60	return NULL;
61}
62