blob: 343ad29e211c66768491e325046ff0b58bcb15ec [file] [log] [blame]
Stephen Rothwell3f23de12007-05-03 02:38:57 +10001/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
5 * Merged from powerpc/kernel/of_platform.c and
6 * sparc{,64}/kernel/of_device.c by Stephen Rothwell
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14#include <linux/errno.h>
Stephen Rothwell5c457082007-10-17 21:17:42 -070015#include <linux/module.h>
Grant Likely5de15402011-06-21 10:59:34 -060016#include <linux/amba/bus.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100017#include <linux/device.h>
Grant Likely5fd200f2010-06-08 07:48:13 -060018#include <linux/dma-mapping.h>
Grant Likely50ef5282010-06-08 07:48:20 -060019#include <linux/slab.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060020#include <linux/of_address.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100021#include <linux/of_device.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060022#include <linux/of_irq.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100023#include <linux/of_platform.h>
Grant Likelyeca39302010-06-08 07:48:21 -060024#include <linux/platform_device.h>
25
Grant Likelycbb49c22011-06-21 10:59:34 -060026const struct of_device_id of_default_bus_match_table[] = {
27 { .compatible = "simple-bus", },
28#ifdef CONFIG_ARM_AMBA
29 { .compatible = "arm,amba-bus", },
30#endif /* CONFIG_ARM_AMBA */
31 {} /* Empty terminated list */
32};
33
Jonas Bonnc6085582010-07-23 19:19:35 +020034static int of_dev_node_match(struct device *dev, void *data)
35{
36 return dev->of_node == data;
37}
38
39/**
40 * of_find_device_by_node - Find the platform_device associated with a node
41 * @np: Pointer to device tree node
42 *
43 * Returns platform_device pointer, or NULL if not found
44 */
45struct platform_device *of_find_device_by_node(struct device_node *np)
46{
47 struct device *dev;
48
49 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
50 return dev ? to_platform_device(dev) : NULL;
51}
52EXPORT_SYMBOL(of_find_device_by_node);
53
Grant Likely596c9552010-07-14 23:51:43 -060054#if defined(CONFIG_PPC_DCR)
55#include <asm/dcr.h>
56#endif
57
Grant Likely964dba22012-02-24 14:58:34 -070058#ifdef CONFIG_OF_ADDRESS
Grant Likely5fd200f2010-06-08 07:48:13 -060059/*
60 * The following routines scan a subtree and registers a device for
61 * each applicable node.
62 *
63 * Note: sparc doesn't use these routines because it has a different
64 * mechanism for creating devices from device tree nodes.
65 */
66
67/**
Grant Likely94c09312010-06-08 07:48:14 -060068 * of_device_make_bus_id - Use the device node data to assign a unique name
69 * @dev: pointer to device structure that is linked to a device tree node
70 *
71 * This routine will first try using either the dcr-reg or the reg property
72 * value to derive a unique name. As a last resort it will use the node
73 * name followed by a unique number.
74 */
Grant Likelyc6601222010-07-23 15:04:01 -060075void of_device_make_bus_id(struct device *dev)
Grant Likely94c09312010-06-08 07:48:14 -060076{
77 static atomic_t bus_no_reg_magic;
78 struct device_node *node = dev->of_node;
79 const u32 *reg;
80 u64 addr;
81 int magic;
82
83#ifdef CONFIG_PPC_DCR
84 /*
85 * If it's a DCR based device, use 'd' for native DCRs
86 * and 'D' for MMIO DCRs.
87 */
88 reg = of_get_property(node, "dcr-reg", NULL);
89 if (reg) {
90#ifdef CONFIG_PPC_DCR_NATIVE
91 dev_set_name(dev, "d%x.%s", *reg, node->name);
92#else /* CONFIG_PPC_DCR_NATIVE */
93 u64 addr = of_translate_dcr_address(node, *reg, NULL);
94 if (addr != OF_BAD_ADDR) {
95 dev_set_name(dev, "D%llx.%s",
96 (unsigned long long)addr, node->name);
97 return;
98 }
99#endif /* !CONFIG_PPC_DCR_NATIVE */
100 }
101#endif /* CONFIG_PPC_DCR */
102
103 /*
104 * For MMIO, get the physical address
105 */
106 reg = of_get_property(node, "reg", NULL);
107 if (reg) {
108 addr = of_translate_address(node, reg);
109 if (addr != OF_BAD_ADDR) {
110 dev_set_name(dev, "%llx.%s",
111 (unsigned long long)addr, node->name);
112 return;
113 }
114 }
115
116 /*
117 * No BusID, use the node name and add a globally incremented
118 * counter (and pray...)
119 */
120 magic = atomic_add_return(1, &bus_no_reg_magic);
121 dev_set_name(dev, "%s.%d", node->name, magic - 1);
122}
123
124/**
125 * of_device_alloc - Allocate and initialize an of_device
126 * @np: device node to assign to device
127 * @bus_id: Name to assign to the device. May be null to use default name.
128 * @parent: Parent device.
129 */
Grant Likely94a0cb12010-07-22 13:59:23 -0600130struct platform_device *of_device_alloc(struct device_node *np,
Grant Likely94c09312010-06-08 07:48:14 -0600131 const char *bus_id,
132 struct device *parent)
133{
Grant Likely94a0cb12010-07-22 13:59:23 -0600134 struct platform_device *dev;
Andres Salomon52f65372010-10-10 21:35:05 -0600135 int rc, i, num_reg = 0, num_irq;
Grant Likelyac80a512010-06-08 07:48:15 -0600136 struct resource *res, temp_res;
Grant Likely94c09312010-06-08 07:48:14 -0600137
Grant Likely7096d042010-10-20 11:45:13 -0600138 dev = platform_device_alloc("", -1);
139 if (!dev)
140 return NULL;
141
142 /* count the io and irq resources */
Grant Likelyac80a512010-06-08 07:48:15 -0600143 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
144 num_reg++;
Andres Salomon52f65372010-10-10 21:35:05 -0600145 num_irq = of_irq_count(np);
Grant Likelyac80a512010-06-08 07:48:15 -0600146
Grant Likelyac80a512010-06-08 07:48:15 -0600147 /* Populate the resource table */
148 if (num_irq || num_reg) {
Grant Likely7096d042010-10-20 11:45:13 -0600149 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
150 if (!res) {
151 platform_device_put(dev);
152 return NULL;
153 }
154
Grant Likelyac80a512010-06-08 07:48:15 -0600155 dev->num_resources = num_reg + num_irq;
156 dev->resource = res;
157 for (i = 0; i < num_reg; i++, res++) {
158 rc = of_address_to_resource(np, i, res);
159 WARN_ON(rc);
160 }
Andres Salomon52f65372010-10-10 21:35:05 -0600161 WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq);
Grant Likelyac80a512010-06-08 07:48:15 -0600162 }
Grant Likely94c09312010-06-08 07:48:14 -0600163
164 dev->dev.of_node = of_node_get(np);
Kumar Gala314b02f2011-07-08 00:17:27 -0500165#if defined(CONFIG_MICROBLAZE)
Grant Likely94c09312010-06-08 07:48:14 -0600166 dev->dev.dma_mask = &dev->archdata.dma_mask;
Grant Likely9e3288d2010-06-08 07:48:26 -0600167#endif
Grant Likely94c09312010-06-08 07:48:14 -0600168 dev->dev.parent = parent;
Grant Likely94c09312010-06-08 07:48:14 -0600169
170 if (bus_id)
171 dev_set_name(&dev->dev, "%s", bus_id);
172 else
173 of_device_make_bus_id(&dev->dev);
174
175 return dev;
176}
177EXPORT_SYMBOL(of_device_alloc);
178
179/**
Grant Likely15c35972011-06-21 10:59:35 -0600180 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
Grant Likely5fd200f2010-06-08 07:48:13 -0600181 * @np: pointer to node to create device for
182 * @bus_id: name to assign device
Grant Likely15c35972011-06-21 10:59:35 -0600183 * @platform_data: pointer to populate platform_data pointer with
Grant Likely5fd200f2010-06-08 07:48:13 -0600184 * @parent: Linux device model parent device.
Grant Likelycd1e6502011-01-03 15:51:11 -0700185 *
186 * Returns pointer to created platform device, or NULL if a device was not
187 * registered. Unavailable devices will not get registered.
Grant Likely5fd200f2010-06-08 07:48:13 -0600188 */
Grant Likely15c35972011-06-21 10:59:35 -0600189struct platform_device *of_platform_device_create_pdata(
190 struct device_node *np,
191 const char *bus_id,
192 void *platform_data,
193 struct device *parent)
Grant Likely5fd200f2010-06-08 07:48:13 -0600194{
Grant Likely94a0cb12010-07-22 13:59:23 -0600195 struct platform_device *dev;
Grant Likely5fd200f2010-06-08 07:48:13 -0600196
Grant Likelycd1e6502011-01-03 15:51:11 -0700197 if (!of_device_is_available(np))
198 return NULL;
199
Grant Likely5fd200f2010-06-08 07:48:13 -0600200 dev = of_device_alloc(np, bus_id, parent);
201 if (!dev)
202 return NULL;
203
Kumar Gala314b02f2011-07-08 00:17:27 -0500204#if defined(CONFIG_MICROBLAZE)
Grant Likely5fd200f2010-06-08 07:48:13 -0600205 dev->archdata.dma_mask = 0xffffffffUL;
Grant Likely9e3288d2010-06-08 07:48:26 -0600206#endif
Grant Likely5fd200f2010-06-08 07:48:13 -0600207 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Grant Likelyeca39302010-06-08 07:48:21 -0600208 dev->dev.bus = &platform_bus_type;
Grant Likely15c35972011-06-21 10:59:35 -0600209 dev->dev.platform_data = platform_data;
Grant Likely5fd200f2010-06-08 07:48:13 -0600210
211 /* We do not fill the DMA ops for platform devices by default.
212 * This is currently the responsibility of the platform code
213 * to do such, possibly using a device notifier
214 */
215
Grant Likely7096d042010-10-20 11:45:13 -0600216 if (of_device_add(dev) != 0) {
217 platform_device_put(dev);
Grant Likely5fd200f2010-06-08 07:48:13 -0600218 return NULL;
219 }
220
221 return dev;
222}
Grant Likely15c35972011-06-21 10:59:35 -0600223
224/**
225 * of_platform_device_create - Alloc, initialize and register an of_device
226 * @np: pointer to node to create device for
227 * @bus_id: name to assign device
228 * @parent: Linux device model parent device.
229 *
230 * Returns pointer to created platform device, or NULL if a device was not
231 * registered. Unavailable devices will not get registered.
232 */
233struct platform_device *of_platform_device_create(struct device_node *np,
234 const char *bus_id,
235 struct device *parent)
236{
237 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
238}
Grant Likely5fd200f2010-06-08 07:48:13 -0600239EXPORT_SYMBOL(of_platform_device_create);
240
Grant Likely5de15402011-06-21 10:59:34 -0600241#ifdef CONFIG_ARM_AMBA
242static struct amba_device *of_amba_device_create(struct device_node *node,
243 const char *bus_id,
244 void *platform_data,
245 struct device *parent)
246{
247 struct amba_device *dev;
248 const void *prop;
249 int i, ret;
250
251 pr_debug("Creating amba device %s\n", node->full_name);
252
253 if (!of_device_is_available(node))
254 return NULL;
255
Russell Kingc0f72f82011-12-18 11:45:17 +0000256 dev = amba_device_alloc(NULL, 0, 0);
Grant Likely5de15402011-06-21 10:59:34 -0600257 if (!dev)
258 return NULL;
259
260 /* setup generic device info */
261 dev->dev.coherent_dma_mask = ~0;
262 dev->dev.of_node = of_node_get(node);
263 dev->dev.parent = parent;
264 dev->dev.platform_data = platform_data;
265 if (bus_id)
266 dev_set_name(&dev->dev, "%s", bus_id);
267 else
268 of_device_make_bus_id(&dev->dev);
269
270 /* setup amba-specific device info */
271 dev->dma_mask = ~0;
272
273 /* Allow the HW Peripheral ID to be overridden */
274 prop = of_get_property(node, "arm,primecell-periphid", NULL);
275 if (prop)
276 dev->periphid = of_read_ulong(prop, 1);
277
278 /* Decode the IRQs and address ranges */
279 for (i = 0; i < AMBA_NR_IRQS; i++)
280 dev->irq[i] = irq_of_parse_and_map(node, i);
281
282 ret = of_address_to_resource(node, 0, &dev->res);
283 if (ret)
284 goto err_free;
285
Russell Kingc0f72f82011-12-18 11:45:17 +0000286 ret = amba_device_add(dev, &iomem_resource);
Grant Likely5de15402011-06-21 10:59:34 -0600287 if (ret)
288 goto err_free;
289
290 return dev;
291
292err_free:
Russell Kingc0f72f82011-12-18 11:45:17 +0000293 amba_device_put(dev);
Grant Likely5de15402011-06-21 10:59:34 -0600294 return NULL;
295}
296#else /* CONFIG_ARM_AMBA */
297static struct amba_device *of_amba_device_create(struct device_node *node,
298 const char *bus_id,
299 void *platform_data,
300 struct device *parent)
301{
302 return NULL;
303}
304#endif /* CONFIG_ARM_AMBA */
305
Grant Likely5fd200f2010-06-08 07:48:13 -0600306/**
Grant Likely15c35972011-06-21 10:59:35 -0600307 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
308 */
309static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
310 struct device_node *np)
311{
312 struct resource res;
Olof Johansson303f59d2011-11-02 22:07:29 -0700313
314 if (!lookup)
315 return NULL;
316
Grant Likelyf88e1ae2011-12-12 09:26:00 -0700317 for(; lookup->compatible != NULL; lookup++) {
Olof Johansson303f59d2011-11-02 22:07:29 -0700318 if (!of_device_is_compatible(np, lookup->compatible))
319 continue;
320 if (of_address_to_resource(np, 0, &res))
321 continue;
322 if (res.start != lookup->phys_addr)
323 continue;
324 pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
325 return lookup;
Grant Likely15c35972011-06-21 10:59:35 -0600326 }
Olof Johansson303f59d2011-11-02 22:07:29 -0700327
Grant Likely15c35972011-06-21 10:59:35 -0600328 return NULL;
329}
330
331/**
Grant Likely38e9e212011-03-18 10:21:28 -0600332 * of_platform_bus_create() - Create a device for a node and its children.
Grant Likely5fd200f2010-06-08 07:48:13 -0600333 * @bus: device node of the bus to instantiate
Grant Likely1eed4c02011-03-18 10:21:29 -0600334 * @matches: match table for bus nodes
Olof Johansson303f59d2011-11-02 22:07:29 -0700335 * @lookup: auxdata table for matching id and platform_data with device nodes
Grant Likely38e9e212011-03-18 10:21:28 -0600336 * @parent: parent for new device, or NULL for top level.
Olof Johansson303f59d2011-11-02 22:07:29 -0700337 * @strict: require compatible property
Grant Likely38e9e212011-03-18 10:21:28 -0600338 *
339 * Creates a platform_device for the provided device_node, and optionally
340 * recursively create devices for all the child nodes.
Grant Likely5fd200f2010-06-08 07:48:13 -0600341 */
Grant Likely38e9e212011-03-18 10:21:28 -0600342static int of_platform_bus_create(struct device_node *bus,
Grant Likely5fd200f2010-06-08 07:48:13 -0600343 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600344 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600345 struct device *parent, bool strict)
Grant Likely5fd200f2010-06-08 07:48:13 -0600346{
Grant Likely15c35972011-06-21 10:59:35 -0600347 const struct of_dev_auxdata *auxdata;
Grant Likely5fd200f2010-06-08 07:48:13 -0600348 struct device_node *child;
Grant Likely94a0cb12010-07-22 13:59:23 -0600349 struct platform_device *dev;
Grant Likely15c35972011-06-21 10:59:35 -0600350 const char *bus_id = NULL;
351 void *platform_data = NULL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600352 int rc = 0;
353
Grant Likely29d4f8a2011-06-21 10:59:34 -0600354 /* Make sure it has a compatible property */
355 if (strict && (!of_get_property(bus, "compatible", NULL))) {
356 pr_debug("%s() - skipping %s, no compatible prop\n",
357 __func__, bus->full_name);
358 return 0;
359 }
360
Grant Likely15c35972011-06-21 10:59:35 -0600361 auxdata = of_dev_lookup(lookup, bus);
362 if (auxdata) {
363 bus_id = auxdata->name;
364 platform_data = auxdata->platform_data;
365 }
366
Grant Likely5de15402011-06-21 10:59:34 -0600367 if (of_device_is_compatible(bus, "arm,primecell")) {
Grant Likely15c35972011-06-21 10:59:35 -0600368 of_amba_device_create(bus, bus_id, platform_data, parent);
Grant Likely5de15402011-06-21 10:59:34 -0600369 return 0;
370 }
371
Grant Likely15c35972011-06-21 10:59:35 -0600372 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
Grant Likely38e9e212011-03-18 10:21:28 -0600373 if (!dev || !of_match_node(matches, bus))
374 return 0;
375
Grant Likely5fd200f2010-06-08 07:48:13 -0600376 for_each_child_of_node(bus, child) {
377 pr_debug(" create child: %s\n", child->full_name);
Grant Likely15c35972011-06-21 10:59:35 -0600378 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
Grant Likely5fd200f2010-06-08 07:48:13 -0600379 if (rc) {
380 of_node_put(child);
381 break;
382 }
383 }
384 return rc;
385}
386
387/**
Grant Likely38e9e212011-03-18 10:21:28 -0600388 * of_platform_bus_probe() - Probe the device-tree for platform buses
Grant Likely5fd200f2010-06-08 07:48:13 -0600389 * @root: parent of the first level to probe or NULL for the root of the tree
Grant Likely1eed4c02011-03-18 10:21:29 -0600390 * @matches: match table for bus nodes
Grant Likely5fd200f2010-06-08 07:48:13 -0600391 * @parent: parent to hook devices from, NULL for toplevel
392 *
393 * Note that children of the provided root are not instantiated as devices
394 * unless the specified root itself matches the bus list and is not NULL.
395 */
396int of_platform_bus_probe(struct device_node *root,
397 const struct of_device_id *matches,
398 struct device *parent)
399{
400 struct device_node *child;
Grant Likely5fd200f2010-06-08 07:48:13 -0600401 int rc = 0;
402
Grant Likely1eed4c02011-03-18 10:21:29 -0600403 root = root ? of_node_get(root) : of_find_node_by_path("/");
404 if (!root)
Grant Likely60d59912010-06-08 07:48:25 -0600405 return -EINVAL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600406
407 pr_debug("of_platform_bus_probe()\n");
408 pr_debug(" starting at: %s\n", root->full_name);
409
Grant Likely1eed4c02011-03-18 10:21:29 -0600410 /* Do a self check of bus type, if there's a match, create children */
Grant Likely5fd200f2010-06-08 07:48:13 -0600411 if (of_match_node(matches, root)) {
Grant Likely15c35972011-06-21 10:59:35 -0600412 rc = of_platform_bus_create(root, matches, NULL, parent, false);
Grant Likely38e9e212011-03-18 10:21:28 -0600413 } else for_each_child_of_node(root, child) {
Grant Likely5fd200f2010-06-08 07:48:13 -0600414 if (!of_match_node(matches, child))
415 continue;
Grant Likely15c35972011-06-21 10:59:35 -0600416 rc = of_platform_bus_create(child, matches, NULL, parent, false);
Grant Likely38e9e212011-03-18 10:21:28 -0600417 if (rc)
Grant Likely5fd200f2010-06-08 07:48:13 -0600418 break;
Grant Likely5fd200f2010-06-08 07:48:13 -0600419 }
Grant Likely38e9e212011-03-18 10:21:28 -0600420
Grant Likely5fd200f2010-06-08 07:48:13 -0600421 of_node_put(root);
422 return rc;
423}
424EXPORT_SYMBOL(of_platform_bus_probe);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600425
426/**
427 * of_platform_populate() - Populate platform_devices from device tree data
428 * @root: parent of the first level to probe or NULL for the root of the tree
429 * @matches: match table, NULL to use the default
430 * @parent: parent to hook devices from, NULL for toplevel
431 *
432 * Similar to of_platform_bus_probe(), this function walks the device tree
433 * and creates devices from nodes. It differs in that it follows the modern
434 * convention of requiring all device nodes to have a 'compatible' property,
435 * and it is suitable for creating devices which are children of the root
436 * node (of_platform_bus_probe will only create children of the root which
437 * are selected by the @matches argument).
438 *
439 * New board support should be using this function instead of
440 * of_platform_bus_probe().
441 *
442 * Returns 0 on success, < 0 on failure.
443 */
444int of_platform_populate(struct device_node *root,
445 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600446 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600447 struct device *parent)
448{
449 struct device_node *child;
450 int rc = 0;
451
452 root = root ? of_node_get(root) : of_find_node_by_path("/");
453 if (!root)
454 return -EINVAL;
455
456 for_each_child_of_node(root, child) {
Grant Likely15c35972011-06-21 10:59:35 -0600457 rc = of_platform_bus_create(child, matches, lookup, parent, true);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600458 if (rc)
459 break;
460 }
461
462 of_node_put(root);
463 return rc;
464}
Grant Likely964dba22012-02-24 14:58:34 -0700465#endif /* CONFIG_OF_ADDRESS */