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2 * PCI <-> OF mapping helpers
4 * Copyright 2011 IBM Corp.
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.
12 #include <linux/irqdomain.h>
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
16 #include <linux/of_irq.h>
17 #include <linux/of_pci.h>
20 void pci_set_of_node(struct pci_dev
*dev
)
22 if (!dev
->bus
->dev
.of_node
)
24 dev
->dev
.of_node
= of_pci_find_child_device(dev
->bus
->dev
.of_node
,
28 void pci_release_of_node(struct pci_dev
*dev
)
30 of_node_put(dev
->dev
.of_node
);
31 dev
->dev
.of_node
= NULL
;
34 void pci_set_bus_of_node(struct pci_bus
*bus
)
36 if (bus
->self
== NULL
)
37 bus
->dev
.of_node
= pcibios_get_phb_of_node(bus
);
39 bus
->dev
.of_node
= of_node_get(bus
->self
->dev
.of_node
);
42 void pci_release_bus_of_node(struct pci_bus
*bus
)
44 of_node_put(bus
->dev
.of_node
);
45 bus
->dev
.of_node
= NULL
;
48 struct device_node
* __weak
pcibios_get_phb_of_node(struct pci_bus
*bus
)
50 /* This should only be called for PHBs */
51 if (WARN_ON(bus
->self
|| bus
->parent
))
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.
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
);
65 struct irq_domain
*pci_host_bridge_of_msi_domain(struct pci_bus
*bus
)
67 #ifdef CONFIG_IRQ_DOMAIN
70 if (!bus
->dev
.of_node
)
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
);
79 * If we don't have an msi-parent property, look for a domain
80 * directly attached to the host bridge.
82 d
= irq_find_matching_host(bus
->dev
.of_node
, DOMAIN_BUS_PCI_MSI
);
86 return irq_find_host(bus
->dev
.of_node
);