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>
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 static 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 int of_register_platform_driver(struct of_platform_driver *drv)
69 /* initialize common driver fields */
70 if (!drv->driver.name)
71 drv->driver.name = drv->name;
72 if (!drv->driver.owner)
73 drv->driver.owner = drv->owner;
74 drv->driver.bus = &of_platform_bus_type;
76 /* register with core */
77 return driver_register(&drv->driver);
79 EXPORT_SYMBOL(of_register_platform_driver);
81 void of_unregister_platform_driver(struct of_platform_driver *drv)
83 driver_unregister(&drv->driver);
85 EXPORT_SYMBOL(of_unregister_platform_driver);
87 struct of_device* of_platform_device_create(struct device_node *np,
89 struct device *parent)
91 struct of_device *dev;
93 dev = of_device_alloc(np, bus_id, parent);
97 dev->dma_mask = 0xffffffffUL;
98 dev->dev.bus = &of_platform_bus_type;
100 /* We do not fill the DMA ops for platform devices by default.
101 * This is currently the responsibility of the platform code
102 * to do such, possibly using a device notifier
105 if (of_device_register(dev) != 0) {
112 EXPORT_SYMBOL(of_platform_device_create);
117 * of_platform_bus_create - Create an OF device for a bus node and all its
118 * children. Optionally recursively instanciate matching busses.
119 * @bus: device node of the bus to instanciate
120 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
121 * disallow recursive creation of child busses
123 static int of_platform_bus_create(struct device_node *bus,
124 struct of_device_id *matches,
125 struct device *parent)
127 struct device_node *child;
128 struct of_device *dev;
131 for (child = NULL; (child = of_get_next_child(bus, child)); ) {
132 pr_debug(" create child: %s\n", child->full_name);
133 dev = of_platform_device_create(child, NULL, parent);
136 else if (!of_match_node(matches, child))
139 pr_debug(" and sub busses\n");
140 rc = of_platform_bus_create(child, matches, &dev->dev);
150 * of_platform_bus_probe - Probe the device-tree for platform busses
151 * @root: parent of the first level to probe or NULL for the root of the tree
152 * @matches: match table, NULL to use the default
153 * @parent: parent to hook devices from, NULL for toplevel
155 * Note that children of the provided root are not instanciated as devices
156 * unless the specified root itself matches the bus list and is not NULL.
159 int of_platform_bus_probe(struct device_node *root,
160 struct of_device_id *matches,
161 struct device *parent)
163 struct device_node *child;
164 struct of_device *dev;
168 matches = of_default_bus_ids;
169 if (matches == OF_NO_DEEP_PROBE)
172 root = of_find_node_by_path("/");
176 pr_debug("of_platform_bus_probe()\n");
177 pr_debug(" starting at: %s\n", root->full_name);
179 /* Do a self check of bus type, if there's a match, create
182 if (of_match_node(matches, root)) {
183 pr_debug(" root match, create all sub devices\n");
184 dev = of_platform_device_create(root, NULL, parent);
189 pr_debug(" create all sub busses\n");
190 rc = of_platform_bus_create(root, matches, &dev->dev);
193 for (child = NULL; (child = of_get_next_child(root, child)); ) {
194 if (!of_match_node(matches, child))
197 pr_debug(" match: %s\n", child->full_name);
198 dev = of_platform_device_create(child, NULL, parent);
202 rc = of_platform_bus_create(child, matches, &dev->dev);
212 EXPORT_SYMBOL(of_platform_bus_probe);
214 static int of_dev_node_match(struct device *dev, void *data)
216 return to_of_device(dev)->node == data;
219 struct of_device *of_find_device_by_node(struct device_node *np)
223 dev = bus_find_device(&of_platform_bus_type,
224 NULL, np, of_dev_node_match);
226 return to_of_device(dev);
229 EXPORT_SYMBOL(of_find_device_by_node);
231 static int of_dev_phandle_match(struct device *dev, void *data)
234 return to_of_device(dev)->node->linux_phandle == *ph;
237 struct of_device *of_find_device_by_phandle(phandle ph)
241 dev = bus_find_device(&of_platform_bus_type,
242 NULL, &ph, of_dev_phandle_match);
244 return to_of_device(dev);
247 EXPORT_SYMBOL(of_find_device_by_phandle);
250 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
252 /* The probing of PCI controllers from of_platform is currently
253 * 64 bits only, mostly due to gratuitous differences between
254 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
255 * lacking some bits needed here.
258 static int __devinit of_pci_phb_probe(struct of_device *dev,
259 const struct of_device_id *match)
261 struct pci_controller *phb;
263 /* Check if we can do that ... */
264 if (ppc_md.pci_setup_phb == NULL)
267 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
269 /* Alloc and setup PHB data structure */
270 phb = pcibios_alloc_controller(dev->node);
274 /* Setup parent in sysfs */
275 phb->parent = &dev->dev;
277 /* Setup the PHB using arch provided callback */
278 if (ppc_md.pci_setup_phb(phb)) {
279 pcibios_free_controller(phb);
283 /* Process "ranges" property */
284 pci_process_bridge_OF_ranges(phb, dev->node, 0);
286 /* Init pci_dn data structures */
287 pci_devs_phb_init_dynamic(phb);
289 /* Register devices with EEH */
291 if (dev->node->child)
292 eeh_add_device_tree_early(dev->node);
293 #endif /* CONFIG_EEH */
298 /* Claim resources. This might need some rework as well depending
299 * wether we are doing probe-only or not, like assigning unassigned
302 pcibios_claim_one_bus(phb->bus);
304 /* Finish EEH setup */
306 eeh_add_device_tree_late(phb->bus);
309 /* Add probed PCI devices to the device model */
310 pci_bus_add_devices(phb->bus);
315 static struct of_device_id of_pci_phb_ids[] = {
319 { .type = "pciex", },
324 static struct of_platform_driver of_pci_phb_driver = {
325 .match_table = of_pci_phb_ids,
326 .probe = of_pci_phb_probe,
332 static __init int of_pci_phb_init(void)
334 return of_register_platform_driver(&of_pci_phb_driver);
337 device_initcall(of_pci_phb_init);
339 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */