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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 | ||
b165e2b6 | 12 | #include <linux/irqdomain.h> |
98d9f30c BH |
13 | #include <linux/kernel.h> |
14 | #include <linux/pci.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_pci.h> | |
17 | #include "pci.h" | |
18 | ||
19 | void pci_set_of_node(struct pci_dev *dev) | |
20 | { | |
21 | if (!dev->bus->dev.of_node) | |
22 | return; | |
23 | dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node, | |
24 | dev->devfn); | |
25 | } | |
26 | ||
27 | void pci_release_of_node(struct pci_dev *dev) | |
28 | { | |
29 | of_node_put(dev->dev.of_node); | |
30 | dev->dev.of_node = NULL; | |
31 | } | |
32 | ||
33 | void pci_set_bus_of_node(struct pci_bus *bus) | |
34 | { | |
35 | if (bus->self == NULL) | |
36 | bus->dev.of_node = pcibios_get_phb_of_node(bus); | |
37 | else | |
38 | bus->dev.of_node = of_node_get(bus->self->dev.of_node); | |
39 | } | |
40 | ||
41 | void pci_release_bus_of_node(struct pci_bus *bus) | |
42 | { | |
43 | of_node_put(bus->dev.of_node); | |
44 | bus->dev.of_node = NULL; | |
45 | } | |
46 | ||
47 | struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) | |
48 | { | |
49 | /* This should only be called for PHBs */ | |
50 | if (WARN_ON(bus->self || bus->parent)) | |
51 | return NULL; | |
52 | ||
53 | /* Look for a node pointer in either the intermediary device we | |
54 | * create above the root bus or it's own parent. Normally only | |
55 | * the later is populated. | |
56 | */ | |
57 | if (bus->bridge->of_node) | |
58 | return of_node_get(bus->bridge->of_node); | |
69566dd8 | 59 | if (bus->bridge->parent && bus->bridge->parent->of_node) |
98d9f30c BH |
60 | return of_node_get(bus->bridge->parent->of_node); |
61 | return NULL; | |
62 | } | |
b165e2b6 MZ |
63 | |
64 | struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) | |
65 | { | |
66 | #ifdef CONFIG_IRQ_DOMAIN | |
67 | struct device_node *np; | |
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 | np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0); | |
471c931c MZ |
75 | |
76 | /* | |
77 | * If we don't have an msi-parent property, look for a domain | |
78 | * directly attached to the host bridge. | |
79 | */ | |
b165e2b6 | 80 | if (!np) |
471c931c | 81 | np = bus->dev.of_node; |
b165e2b6 MZ |
82 | |
83 | d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); | |
84 | if (d) | |
85 | return d; | |
86 | ||
87 | return irq_find_host(np); | |
88 | #else | |
89 | return NULL; | |
90 | #endif | |
91 | } |