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}

 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/irqdomain.h>
13#include <linux/kernel.h>
14#include <linux/pci.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/of_pci.h>
18#include "pci.h"
19
20void pci_set_of_node(struct pci_dev *dev)
21{
22	if (!dev->bus->dev.of_node)
23		return;
24	dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
25						    dev->devfn);
26}
27
28void pci_release_of_node(struct pci_dev *dev)
29{
30	of_node_put(dev->dev.of_node);
31	dev->dev.of_node = NULL;
32}
33
34void pci_set_bus_of_node(struct pci_bus *bus)
35{
36	if (bus->self == NULL)
37		bus->dev.of_node = pcibios_get_phb_of_node(bus);
38	else
39		bus->dev.of_node = of_node_get(bus->self->dev.of_node);
40}
41
42void pci_release_bus_of_node(struct pci_bus *bus)
43{
44	of_node_put(bus->dev.of_node);
45	bus->dev.of_node = NULL;
46}
47
48struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
49{
50	/* This should only be called for PHBs */
51	if (WARN_ON(bus->self || bus->parent))
52		return NULL;
53
54	/* Look for a node pointer in either the intermediary device we
55	 * create above the root bus or it's own parent. Normally only
56	 * the later is populated.
57	 */
58	if (bus->bridge->of_node)
59		return of_node_get(bus->bridge->of_node);
60	if (bus->bridge->parent && bus->bridge->parent->of_node)
61		return of_node_get(bus->bridge->parent->of_node);
62	return NULL;
63}
64
65struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
66{
67#ifdef CONFIG_IRQ_DOMAIN
68	struct irq_domain *d;
69
70	if (!bus->dev.of_node)
71		return NULL;
72
73	/* Start looking for a phandle to an MSI controller. */
74	d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
75	if (d)
76		return d;
77
78	/*
79	 * If we don't have an msi-parent property, look for a domain
80	 * directly attached to the host bridge.
81	 */
82	d = irq_find_matching_host(bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
83	if (d)
84		return d;
85
86	return irq_find_host(bus->dev.of_node);
87#else
88	return NULL;
89#endif
90}