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/slab.h>
21 #include <linux/pci.h>
23 #include <linux/of_device.h>
24 #include <linux/of_platform.h>
26 #include <asm/errno.h>
27 #include <asm/topology.h>
28 #include <asm/pci-bridge.h>
29 #include <asm/ppc-pci.h>
30 #include <asm/atomic.h>
33 * The list of OF IDs below is used for matching bus types in the
34 * system whose devices are to be exposed as of_platform_devices.
36 * This is the default list valid for most platforms. This file provides
37 * functions who can take an explicit list if necessary though
39 * The search is always performed recursively looking for children of
40 * the provided device_node and recursively if such a children matches
41 * a bus type in the list
44 static const struct of_device_id of_default_bus_ids[] = {
46 { .compatible = "soc", },
47 { .type = "spider", },
56 struct bus_type of_platform_bus_type = {
57 .uevent = of_device_uevent,
59 EXPORT_SYMBOL(of_platform_bus_type);
61 static int __init of_bus_driver_init(void)
63 return of_bus_type_init(&of_platform_bus_type, "of_platform");
66 postcore_initcall(of_bus_driver_init);
68 struct of_device* of_platform_device_create(struct device_node *np,
70 struct device *parent)
72 struct of_device *dev;
74 dev = of_device_alloc(np, bus_id, parent);
78 dev->dma_mask = 0xffffffffUL;
79 dev->dev.bus = &of_platform_bus_type;
81 /* We do not fill the DMA ops for platform devices by default.
82 * This is currently the responsibility of the platform code
83 * to do such, possibly using a device notifier
86 if (of_device_register(dev) != 0) {
93 EXPORT_SYMBOL(of_platform_device_create);
98 * of_platform_bus_create - Create an OF device for a bus node and all its
99 * children. Optionally recursively instanciate matching busses.
100 * @bus: device node of the bus to instanciate
101 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
102 * disallow recursive creation of child busses
104 static int of_platform_bus_create(const struct device_node *bus,
105 const struct of_device_id *matches,
106 struct device *parent)
108 struct device_node *child;
109 struct of_device *dev;
112 for_each_child_of_node(bus, child) {
113 pr_debug(" create child: %s\n", child->full_name);
114 dev = of_platform_device_create(child, NULL, parent);
117 else if (!of_match_node(matches, child))
120 pr_debug(" and sub busses\n");
121 rc = of_platform_bus_create(child, matches, &dev->dev);
131 * of_platform_bus_probe - Probe the device-tree for platform busses
132 * @root: parent of the first level to probe or NULL for the root of the tree
133 * @matches: match table, NULL to use the default
134 * @parent: parent to hook devices from, NULL for toplevel
136 * Note that children of the provided root are not instanciated as devices
137 * unless the specified root itself matches the bus list and is not NULL.
140 int of_platform_bus_probe(struct device_node *root,
141 const struct of_device_id *matches,
142 struct device *parent)
144 struct device_node *child;
145 struct of_device *dev;
149 matches = of_default_bus_ids;
150 if (matches == OF_NO_DEEP_PROBE)
153 root = of_find_node_by_path("/");
157 pr_debug("of_platform_bus_probe()\n");
158 pr_debug(" starting at: %s\n", root->full_name);
160 /* Do a self check of bus type, if there's a match, create
163 if (of_match_node(matches, root)) {
164 pr_debug(" root match, create all sub devices\n");
165 dev = of_platform_device_create(root, NULL, parent);
170 pr_debug(" create all sub busses\n");
171 rc = of_platform_bus_create(root, matches, &dev->dev);
174 for_each_child_of_node(root, child) {
175 if (!of_match_node(matches, child))
178 pr_debug(" match: %s\n", child->full_name);
179 dev = of_platform_device_create(child, NULL, parent);
183 rc = of_platform_bus_create(child, matches, &dev->dev);
193 EXPORT_SYMBOL(of_platform_bus_probe);
195 static int of_dev_node_match(struct device *dev, void *data)
197 return to_of_device(dev)->node == data;
200 struct of_device *of_find_device_by_node(struct device_node *np)
204 dev = bus_find_device(&of_platform_bus_type,
205 NULL, np, of_dev_node_match);
207 return to_of_device(dev);
210 EXPORT_SYMBOL(of_find_device_by_node);
212 static int of_dev_phandle_match(struct device *dev, void *data)
215 return to_of_device(dev)->node->linux_phandle == *ph;
218 struct of_device *of_find_device_by_phandle(phandle ph)
222 dev = bus_find_device(&of_platform_bus_type,
223 NULL, &ph, of_dev_phandle_match);
225 return to_of_device(dev);
228 EXPORT_SYMBOL(of_find_device_by_phandle);
231 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
233 /* The probing of PCI controllers from of_platform is currently
234 * 64 bits only, mostly due to gratuitous differences between
235 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
236 * lacking some bits needed here.
239 static int __devinit of_pci_phb_probe(struct of_device *dev,
240 const struct of_device_id *match)
242 struct pci_controller *phb;
244 /* Check if we can do that ... */
245 if (ppc_md.pci_setup_phb == NULL)
248 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
250 /* Alloc and setup PHB data structure */
251 phb = pcibios_alloc_controller(dev->node);
255 /* Setup parent in sysfs */
256 phb->parent = &dev->dev;
258 /* Setup the PHB using arch provided callback */
259 if (ppc_md.pci_setup_phb(phb)) {
260 pcibios_free_controller(phb);
264 /* Process "ranges" property */
265 pci_process_bridge_OF_ranges(phb, dev->node, 0);
267 /* Init pci_dn data structures */
268 pci_devs_phb_init_dynamic(phb);
270 /* Register devices with EEH */
272 if (dev->node->child)
273 eeh_add_device_tree_early(dev->node);
274 #endif /* CONFIG_EEH */
278 if (phb->bus == NULL)
281 /* Claim resources. This might need some rework as well depending
282 * wether we are doing probe-only or not, like assigning unassigned
285 pcibios_claim_one_bus(phb->bus);
287 /* Finish EEH setup */
289 eeh_add_device_tree_late(phb->bus);
292 /* Add probed PCI devices to the device model */
293 pci_bus_add_devices(phb->bus);
298 static struct of_device_id of_pci_phb_ids[] = {
302 { .type = "pciex", },
307 static struct of_platform_driver of_pci_phb_driver = {
308 .match_table = of_pci_phb_ids,
309 .probe = of_pci_phb_probe,
315 static __init int of_pci_phb_init(void)
317 return of_register_platform_driver(&of_pci_phb_driver);
320 device_initcall(of_pci_phb_init);
322 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */