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 <asm/errno.h>
25 #include <asm/of_device.h>
26 #include <asm/of_platform.h>
27 #include <asm/topology.h>
28 #include <asm/pci-bridge.h>
29 #include <asm/ppc-pci.h>
30 #include <asm/atomic.h>
34 * The list of OF IDs below is used for matching bus types in the
35 * system whose devices are to be exposed as of_platform_devices.
37 * This is the default list valid for most platforms. This file provides
38 * functions who can take an explicit list if necessary though
40 * The search is always performed recursively looking for children of
41 * the provided device_node and recursively if such a children matches
42 * a bus type in the list
45 static struct of_device_id of_default_bus_ids[] = {
47 { .compatible = "soc", },
48 { .type = "spider", },
56 static atomic_t bus_no_reg_magic;
60 * OF platform device type definition & base infrastructure
64 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
66 struct of_device * of_dev = to_of_device(dev);
67 struct of_platform_driver * of_drv = to_of_platform_driver(drv);
68 const struct of_device_id * matches = of_drv->match_table;
73 return of_match_device(matches, of_dev) != NULL;
76 static int of_platform_device_probe(struct device *dev)
79 struct of_platform_driver *drv;
80 struct of_device *of_dev;
81 const struct of_device_id *match;
83 drv = to_of_platform_driver(dev->driver);
84 of_dev = to_of_device(dev);
91 match = of_match_device(drv->match_table, of_dev);
93 error = drv->probe(of_dev, match);
100 static int of_platform_device_remove(struct device *dev)
102 struct of_device * of_dev = to_of_device(dev);
103 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
105 if (dev->driver && drv->remove)
110 static int of_platform_device_suspend(struct device *dev, pm_message_t state)
112 struct of_device * of_dev = to_of_device(dev);
113 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
116 if (dev->driver && drv->suspend)
117 error = drv->suspend(of_dev, state);
121 static int of_platform_device_resume(struct device * dev)
123 struct of_device * of_dev = to_of_device(dev);
124 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
127 if (dev->driver && drv->resume)
128 error = drv->resume(of_dev);
132 struct bus_type of_platform_bus_type = {
133 .name = "of_platform",
134 .match = of_platform_bus_match,
135 .probe = of_platform_device_probe,
136 .remove = of_platform_device_remove,
137 .suspend = of_platform_device_suspend,
138 .resume = of_platform_device_resume,
140 EXPORT_SYMBOL(of_platform_bus_type);
142 static int __init of_bus_driver_init(void)
144 return bus_register(&of_platform_bus_type);
147 postcore_initcall(of_bus_driver_init);
149 int of_register_platform_driver(struct of_platform_driver *drv)
151 /* initialize common driver fields */
152 drv->driver.name = drv->name;
153 drv->driver.bus = &of_platform_bus_type;
155 /* register with core */
156 return driver_register(&drv->driver);
158 EXPORT_SYMBOL(of_register_platform_driver);
160 void of_unregister_platform_driver(struct of_platform_driver *drv)
162 driver_unregister(&drv->driver);
164 EXPORT_SYMBOL(of_unregister_platform_driver);
166 static void of_platform_make_bus_id(struct of_device *dev)
168 struct device_node *node = dev->node;
169 char *name = dev->dev.bus_id;
175 * If it's a DCR based device, use 'd' for native DCRs
176 * and 'D' for MMIO DCRs.
178 #ifdef CONFIG_PPC_DCR
179 reg = get_property(node, "dcr-reg", NULL);
181 #ifdef CONFIG_PPC_DCR_NATIVE
182 snprintf(name, BUS_ID_SIZE, "d%x.%s",
184 #else /* CONFIG_PPC_DCR_NATIVE */
185 addr = of_translate_dcr_address(node, *reg, NULL);
186 if (addr != OF_BAD_ADDR) {
187 snprintf(name, BUS_ID_SIZE,
188 "D%llx.%s", (unsigned long long)addr,
192 #endif /* !CONFIG_PPC_DCR_NATIVE */
194 #endif /* CONFIG_PPC_DCR */
197 * For MMIO, get the physical address
199 reg = get_property(node, "reg", NULL);
201 addr = of_translate_address(node, reg);
202 if (addr != OF_BAD_ADDR) {
203 snprintf(name, BUS_ID_SIZE,
204 "%llx.%s", (unsigned long long)addr,
211 * No BusID, use the node name and add a globally incremented
212 * counter (and pray...)
214 magic = atomic_add_return(1, &bus_no_reg_magic);
215 snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
218 struct of_device* of_platform_device_create(struct device_node *np,
220 struct device *parent)
222 struct of_device *dev;
224 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
227 memset(dev, 0, sizeof(*dev));
229 dev->node = of_node_get(np);
230 dev->dma_mask = 0xffffffffUL;
231 dev->dev.dma_mask = &dev->dma_mask;
232 dev->dev.parent = parent;
233 dev->dev.bus = &of_platform_bus_type;
234 dev->dev.release = of_release_dev;
235 dev->dev.archdata.of_node = np;
236 dev->dev.archdata.numa_node = of_node_to_nid(np);
238 /* We do not fill the DMA ops for platform devices by default.
239 * This is currently the responsibility of the platform code
240 * to do such, possibly using a device notifier
244 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
246 of_platform_make_bus_id(dev);
248 if (of_device_register(dev) != 0) {
255 EXPORT_SYMBOL(of_platform_device_create);
260 * of_platform_bus_create - Create an OF device for a bus node and all its
261 * children. Optionally recursively instanciate matching busses.
262 * @bus: device node of the bus to instanciate
263 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
264 * disallow recursive creation of child busses
266 static int of_platform_bus_create(struct device_node *bus,
267 struct of_device_id *matches,
268 struct device *parent)
270 struct device_node *child;
271 struct of_device *dev;
274 for (child = NULL; (child = of_get_next_child(bus, child)); ) {
275 pr_debug(" create child: %s\n", child->full_name);
276 dev = of_platform_device_create(child, NULL, parent);
279 else if (!of_match_node(matches, child))
282 pr_debug(" and sub busses\n");
283 rc = of_platform_bus_create(child, matches, &dev->dev);
293 * of_platform_bus_probe - Probe the device-tree for platform busses
294 * @root: parent of the first level to probe or NULL for the root of the tree
295 * @matches: match table, NULL to use the default
296 * @parent: parent to hook devices from, NULL for toplevel
298 * Note that children of the provided root are not instanciated as devices
299 * unless the specified root itself matches the bus list and is not NULL.
302 int of_platform_bus_probe(struct device_node *root,
303 struct of_device_id *matches,
304 struct device *parent)
306 struct device_node *child;
307 struct of_device *dev;
311 matches = of_default_bus_ids;
312 if (matches == OF_NO_DEEP_PROBE)
315 root = of_find_node_by_path("/");
319 pr_debug("of_platform_bus_probe()\n");
320 pr_debug(" starting at: %s\n", root->full_name);
322 /* Do a self check of bus type, if there's a match, create
325 if (of_match_node(matches, root)) {
326 pr_debug(" root match, create all sub devices\n");
327 dev = of_platform_device_create(root, NULL, parent);
332 pr_debug(" create all sub busses\n");
333 rc = of_platform_bus_create(root, matches, &dev->dev);
336 for (child = NULL; (child = of_get_next_child(root, child)); ) {
337 if (!of_match_node(matches, child))
340 pr_debug(" match: %s\n", child->full_name);
341 dev = of_platform_device_create(child, NULL, parent);
345 rc = of_platform_bus_create(child, matches, &dev->dev);
355 EXPORT_SYMBOL(of_platform_bus_probe);
357 static int of_dev_node_match(struct device *dev, void *data)
359 return to_of_device(dev)->node == data;
362 struct of_device *of_find_device_by_node(struct device_node *np)
366 dev = bus_find_device(&of_platform_bus_type,
367 NULL, np, of_dev_node_match);
369 return to_of_device(dev);
372 EXPORT_SYMBOL(of_find_device_by_node);
374 static int of_dev_phandle_match(struct device *dev, void *data)
377 return to_of_device(dev)->node->linux_phandle == *ph;
380 struct of_device *of_find_device_by_phandle(phandle ph)
384 dev = bus_find_device(&of_platform_bus_type,
385 NULL, &ph, of_dev_phandle_match);
387 return to_of_device(dev);
390 EXPORT_SYMBOL(of_find_device_by_phandle);
393 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
395 /* The probing of PCI controllers from of_platform is currently
396 * 64 bits only, mostly due to gratuitous differences between
397 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
398 * lacking some bits needed here.
401 static int __devinit of_pci_phb_probe(struct of_device *dev,
402 const struct of_device_id *match)
404 struct pci_controller *phb;
406 /* Check if we can do that ... */
407 if (ppc_md.pci_setup_phb == NULL)
410 printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
412 /* Alloc and setup PHB data structure */
413 phb = pcibios_alloc_controller(dev->node);
417 /* Setup parent in sysfs */
418 phb->parent = &dev->dev;
420 /* Setup the PHB using arch provided callback */
421 if (ppc_md.pci_setup_phb(phb)) {
422 pcibios_free_controller(phb);
426 /* Process "ranges" property */
427 pci_process_bridge_OF_ranges(phb, dev->node, 0);
430 * This will not work properly for ISA IOs, something needs to be done
431 * about it if we ever generalize that way of probing PCI brigdes
433 pci_setup_phb_io_dynamic(phb, 0);
435 /* Init pci_dn data structures */
436 pci_devs_phb_init_dynamic(phb);
438 /* Register devices with EEH */
440 if (dev->node->child)
441 eeh_add_device_tree_early(dev->node);
442 #endif /* CONFIG_EEH */
447 /* Claim resources. This might need some rework as well depending
448 * wether we are doing probe-only or not, like assigning unassigned
451 pcibios_claim_one_bus(phb->bus);
453 /* Finish EEH setup */
455 eeh_add_device_tree_late(phb->bus);
458 /* Add probed PCI devices to the device model */
459 pci_bus_add_devices(phb->bus);
464 static struct of_device_id of_pci_phb_ids[] = {
468 { .type = "pciex", },
473 static struct of_platform_driver of_pci_phb_driver = {
475 .match_table = of_pci_phb_ids,
476 .probe = of_pci_phb_probe,
478 .multithread_probe = 1,
482 static __init int of_pci_phb_init(void)
484 return of_register_platform_driver(&of_pci_phb_driver);
487 device_initcall(of_pci_phb_init);
489 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */