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.coherent_dma_mask = DMA_BIT_MASK(32);
81 dev->dev.bus = &of_platform_bus_type;
83 /* We do not fill the DMA ops for platform devices by default.
84 * This is currently the responsibility of the platform code
85 * to do such, possibly using a device notifier
88 if (of_device_register(dev) != 0) {
95 EXPORT_SYMBOL(of_platform_device_create);
100 * of_platform_bus_create - Create an OF device for a bus node and all its
101 * children. Optionally recursively instanciate matching busses.
102 * @bus: device node of the bus to instanciate
103 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
104 * disallow recursive creation of child busses
106 static int of_platform_bus_create(const struct device_node *bus,
107 const struct of_device_id *matches,
108 struct device *parent)
110 struct device_node *child;
111 struct of_device *dev;
114 for_each_child_of_node(bus, child) {
115 pr_debug(" create child: %s\n", child->full_name);
116 dev = of_platform_device_create(child, NULL, parent);
119 else if (!of_match_node(matches, child))
122 pr_debug(" and sub busses\n");
123 rc = of_platform_bus_create(child, matches, &dev->dev);
133 * of_platform_bus_probe - Probe the device-tree for platform busses
134 * @root: parent of the first level to probe or NULL for the root of the tree
135 * @matches: match table, NULL to use the default
136 * @parent: parent to hook devices from, NULL for toplevel
138 * Note that children of the provided root are not instanciated as devices
139 * unless the specified root itself matches the bus list and is not NULL.
142 int of_platform_bus_probe(struct device_node *root,
143 const struct of_device_id *matches,
144 struct device *parent)
146 struct device_node *child;
147 struct of_device *dev;
151 matches = of_default_bus_ids;
152 if (matches == OF_NO_DEEP_PROBE)
155 root = of_find_node_by_path("/");
159 pr_debug("of_platform_bus_probe()\n");
160 pr_debug(" starting at: %s\n", root->full_name);
162 /* Do a self check of bus type, if there's a match, create
165 if (of_match_node(matches, root)) {
166 pr_debug(" root match, create all sub devices\n");
167 dev = of_platform_device_create(root, NULL, parent);
172 pr_debug(" create all sub busses\n");
173 rc = of_platform_bus_create(root, matches, &dev->dev);
176 for_each_child_of_node(root, child) {
177 if (!of_match_node(matches, child))
180 pr_debug(" match: %s\n", child->full_name);
181 dev = of_platform_device_create(child, NULL, parent);
185 rc = of_platform_bus_create(child, matches, &dev->dev);
195 EXPORT_SYMBOL(of_platform_bus_probe);
197 static int of_dev_node_match(struct device *dev, void *data)
199 return to_of_device(dev)->node == data;
202 struct of_device *of_find_device_by_node(struct device_node *np)
206 dev = bus_find_device(&of_platform_bus_type,
207 NULL, np, of_dev_node_match);
209 return to_of_device(dev);
212 EXPORT_SYMBOL(of_find_device_by_node);
214 static int of_dev_phandle_match(struct device *dev, void *data)
217 return to_of_device(dev)->node->linux_phandle == *ph;
220 struct of_device *of_find_device_by_phandle(phandle ph)
224 dev = bus_find_device(&of_platform_bus_type,
225 NULL, &ph, of_dev_phandle_match);
227 return to_of_device(dev);
230 EXPORT_SYMBOL(of_find_device_by_phandle);
233 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
235 /* The probing of PCI controllers from of_platform is currently
236 * 64 bits only, mostly due to gratuitous differences between
237 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
238 * lacking some bits needed here.
241 static int __devinit of_pci_phb_probe(struct of_device *dev,
242 const struct of_device_id *match)
244 struct pci_controller *phb;
246 /* Check if we can do that ... */
247 if (ppc_md.pci_setup_phb == NULL)
250 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
252 /* Alloc and setup PHB data structure */
253 phb = pcibios_alloc_controller(dev->node);
257 /* Setup parent in sysfs */
258 phb->parent = &dev->dev;
260 /* Setup the PHB using arch provided callback */
261 if (ppc_md.pci_setup_phb(phb)) {
262 pcibios_free_controller(phb);
266 /* Process "ranges" property */
267 pci_process_bridge_OF_ranges(phb, dev->node, 0);
269 /* Init pci_dn data structures */
270 pci_devs_phb_init_dynamic(phb);
272 /* Register devices with EEH */
274 if (dev->node->child)
275 eeh_add_device_tree_early(dev->node);
276 #endif /* CONFIG_EEH */
280 if (phb->bus == NULL)
283 /* Claim resources. This might need some rework as well depending
284 * wether we are doing probe-only or not, like assigning unassigned
287 pcibios_claim_one_bus(phb->bus);
289 /* Finish EEH setup */
291 eeh_add_device_tree_late(phb->bus);
294 /* Add probed PCI devices to the device model */
295 pci_bus_add_devices(phb->bus);
300 static struct of_device_id of_pci_phb_ids[] = {
304 { .type = "pciex", },
309 static struct of_platform_driver of_pci_phb_driver = {
310 .match_table = of_pci_phb_ids,
311 .probe = of_pci_phb_probe,
317 static __init int of_pci_phb_init(void)
319 return of_register_platform_driver(&of_pci_phb_driver);
322 device_initcall(of_pci_phb_init);
324 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */