2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, 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.
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/pci.h>
22 #include <linux/of_device.h>
23 #include <linux/of_platform.h>
25 #include <asm/errno.h>
26 #include <asm/topology.h>
27 #include <asm/pci-bridge.h>
28 #include <asm/ppc-pci.h>
29 #include <asm/atomic.h>
32 * The list of OF IDs below is used for matching bus types in the
33 * system whose devices are to be exposed as of_platform_devices.
35 * This is the default list valid for most platforms. This file provides
36 * functions who can take an explicit list if necessary though
38 * The search is always performed recursively looking for children of
39 * the provided device_node and recursively if such a children matches
40 * a bus type in the list
43 const struct of_device_id of_default_bus_ids[] = {
45 { .compatible = "soc", },
46 { .type = "spider", },
55 struct bus_type of_platform_bus_type = {
56 .uevent = of_device_uevent,
58 EXPORT_SYMBOL(of_platform_bus_type);
60 static int __init of_bus_driver_init(void)
62 return of_bus_type_init(&of_platform_bus_type, "of_platform");
65 postcore_initcall(of_bus_driver_init);
67 static int of_dev_node_match(struct device *dev, void *data)
69 return to_of_device(dev)->dev.of_node == data;
72 struct of_device *of_find_device_by_node(struct device_node *np)
76 dev = bus_find_device(&of_platform_bus_type,
77 NULL, np, of_dev_node_match);
79 return to_of_device(dev);
82 EXPORT_SYMBOL(of_find_device_by_node);
84 static int of_dev_phandle_match(struct device *dev, void *data)
87 return to_of_device(dev)->dev.of_node->phandle == *ph;
90 struct of_device *of_find_device_by_phandle(phandle ph)
94 dev = bus_find_device(&of_platform_bus_type,
95 NULL, &ph, of_dev_phandle_match);
97 return to_of_device(dev);
100 EXPORT_SYMBOL(of_find_device_by_phandle);
103 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
105 /* The probing of PCI controllers from of_platform is currently
106 * 64 bits only, mostly due to gratuitous differences between
107 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
108 * lacking some bits needed here.
111 static int __devinit of_pci_phb_probe(struct of_device *dev,
112 const struct of_device_id *match)
114 struct pci_controller *phb;
116 /* Check if we can do that ... */
117 if (ppc_md.pci_setup_phb == NULL)
120 pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);
122 /* Alloc and setup PHB data structure */
123 phb = pcibios_alloc_controller(dev->dev.of_node);
127 /* Setup parent in sysfs */
128 phb->parent = &dev->dev;
130 /* Setup the PHB using arch provided callback */
131 if (ppc_md.pci_setup_phb(phb)) {
132 pcibios_free_controller(phb);
136 /* Process "ranges" property */
137 pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
139 /* Init pci_dn data structures */
140 pci_devs_phb_init_dynamic(phb);
142 /* Register devices with EEH */
144 if (dev->dev.of_node->child)
145 eeh_add_device_tree_early(dev->dev.of_node);
146 #endif /* CONFIG_EEH */
149 pcibios_scan_phb(phb, dev->dev.of_node);
150 if (phb->bus == NULL)
153 /* Claim resources. This might need some rework as well depending
154 * wether we are doing probe-only or not, like assigning unassigned
157 pcibios_claim_one_bus(phb->bus);
159 /* Finish EEH setup */
161 eeh_add_device_tree_late(phb->bus);
164 /* Add probed PCI devices to the device model */
165 pci_bus_add_devices(phb->bus);
170 static struct of_device_id of_pci_phb_ids[] = {
174 { .type = "pciex", },
179 static struct of_platform_driver of_pci_phb_driver = {
180 .probe = of_pci_phb_probe,
183 .owner = THIS_MODULE,
184 .of_match_table = of_pci_phb_ids,
188 static __init int of_pci_phb_init(void)
190 return of_register_platform_driver(&of_pci_phb_driver);
193 device_initcall(of_pci_phb_init);
195 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */