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3f23de10 SR |
1 | /* |
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 | */ | |
606ad42a RH |
14 | |
15 | #define pr_fmt(fmt) "OF: " fmt | |
16 | ||
3f23de10 | 17 | #include <linux/errno.h> |
5c457083 | 18 | #include <linux/module.h> |
5de1540b | 19 | #include <linux/amba/bus.h> |
3f23de10 | 20 | #include <linux/device.h> |
5fd200f3 | 21 | #include <linux/dma-mapping.h> |
50ef5284 | 22 | #include <linux/slab.h> |
9e3288dc | 23 | #include <linux/of_address.h> |
3f23de10 | 24 | #include <linux/of_device.h> |
9e3288dc | 25 | #include <linux/of_irq.h> |
3f23de10 | 26 | #include <linux/of_platform.h> |
eca39301 GL |
27 | #include <linux/platform_device.h> |
28 | ||
cbb49c26 GL |
29 | const struct of_device_id of_default_bus_match_table[] = { |
30 | { .compatible = "simple-bus", }, | |
22869a9e | 31 | { .compatible = "simple-mfd", }, |
ecd76ede | 32 | { .compatible = "isa", }, |
cbb49c26 GL |
33 | #ifdef CONFIG_ARM_AMBA |
34 | { .compatible = "arm,amba-bus", }, | |
35 | #endif /* CONFIG_ARM_AMBA */ | |
36 | {} /* Empty terminated list */ | |
37 | }; | |
38 | ||
c6085584 JB |
39 | static int of_dev_node_match(struct device *dev, void *data) |
40 | { | |
41 | return dev->of_node == data; | |
42 | } | |
43 | ||
44 | /** | |
45 | * of_find_device_by_node - Find the platform_device associated with a node | |
46 | * @np: Pointer to device tree node | |
47 | * | |
48 | * Returns platform_device pointer, or NULL if not found | |
49 | */ | |
50 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
51 | { | |
52 | struct device *dev; | |
53 | ||
54 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
55 | return dev ? to_platform_device(dev) : NULL; | |
56 | } | |
57 | EXPORT_SYMBOL(of_find_device_by_node); | |
58 | ||
964dba28 | 59 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
60 | /* |
61 | * The following routines scan a subtree and registers a device for | |
62 | * each applicable node. | |
63 | * | |
64 | * Note: sparc doesn't use these routines because it has a different | |
65 | * mechanism for creating devices from device tree nodes. | |
66 | */ | |
67 | ||
94c09319 GL |
68 | /** |
69 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
70 | * @dev: pointer to device structure that is linked to a device tree node | |
71 | * | |
07e461cd GL |
72 | * This routine will first try using the translated bus address to |
73 | * derive a unique name. If it cannot, then it will prepend names from | |
74 | * parent nodes until a unique name can be derived. | |
94c09319 | 75 | */ |
c6601225 | 76 | void of_device_make_bus_id(struct device *dev) |
94c09319 | 77 | { |
94c09319 | 78 | struct device_node *node = dev->of_node; |
24fb530f | 79 | const __be32 *reg; |
94c09319 | 80 | u64 addr; |
94c09319 | 81 | |
07e461cd GL |
82 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
83 | while (node->parent) { | |
84 | /* | |
85 | * If the address can be translated, then that is as much | |
86 | * uniqueness as we need. Make it the first component and return | |
87 | */ | |
88 | reg = of_get_property(node, "reg", NULL); | |
89 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { | |
90 | dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", | |
91 | (unsigned long long)addr, node->name, | |
92 | dev_name(dev)); | |
94c09319 GL |
93 | return; |
94 | } | |
94c09319 | 95 | |
07e461cd GL |
96 | /* format arguments only used if dev_name() resolves to NULL */ |
97 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", | |
98 | strrchr(node->full_name, '/') + 1, dev_name(dev)); | |
99 | node = node->parent; | |
100 | } | |
94c09319 GL |
101 | } |
102 | ||
103 | /** | |
104 | * of_device_alloc - Allocate and initialize an of_device | |
105 | * @np: device node to assign to device | |
106 | * @bus_id: Name to assign to the device. May be null to use default name. | |
107 | * @parent: Parent device. | |
108 | */ | |
94a0cb1f | 109 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
110 | const char *bus_id, |
111 | struct device *parent) | |
112 | { | |
94a0cb1f | 113 | struct platform_device *dev; |
52f6537c | 114 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
115 | struct resource *res, temp_res; |
116 | ||
7096d042 GL |
117 | dev = platform_device_alloc("", -1); |
118 | if (!dev) | |
119 | return NULL; | |
120 | ||
121 | /* count the io and irq resources */ | |
d9c6866b RH |
122 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
123 | num_reg++; | |
52f6537c | 124 | num_irq = of_irq_count(np); |
ac80a51e | 125 | |
ac80a51e GL |
126 | /* Populate the resource table */ |
127 | if (num_irq || num_reg) { | |
7096d042 GL |
128 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
129 | if (!res) { | |
130 | platform_device_put(dev); | |
131 | return NULL; | |
132 | } | |
133 | ||
ac80a51e GL |
134 | dev->num_resources = num_reg + num_irq; |
135 | dev->resource = res; | |
136 | for (i = 0; i < num_reg; i++, res++) { | |
137 | rc = of_address_to_resource(np, i, res); | |
138 | WARN_ON(rc); | |
139 | } | |
9ec36caf RH |
140 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
141 | pr_debug("not all legacy IRQ resources mapped for %s\n", | |
142 | np->name); | |
ac80a51e | 143 | } |
94c09319 GL |
144 | |
145 | dev->dev.of_node = of_node_get(np); | |
f94277af | 146 | dev->dev.fwnode = &np->fwnode; |
43c0767e | 147 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
148 | |
149 | if (bus_id) | |
150 | dev_set_name(&dev->dev, "%s", bus_id); | |
151 | else | |
152 | of_device_make_bus_id(&dev->dev); | |
153 | ||
154 | return dev; | |
155 | } | |
156 | EXPORT_SYMBOL(of_device_alloc); | |
157 | ||
97890ba9 WD |
158 | static void of_dma_deconfigure(struct device *dev) |
159 | { | |
160 | arch_teardown_dma_ops(dev); | |
591c1ee4 SS |
161 | } |
162 | ||
5fd200f3 | 163 | /** |
15c3597d | 164 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
165 | * @np: pointer to node to create device for |
166 | * @bus_id: name to assign device | |
15c3597d | 167 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 168 | * @parent: Linux device model parent device. |
cd1e6504 GL |
169 | * |
170 | * Returns pointer to created platform device, or NULL if a device was not | |
171 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 172 | */ |
245d9641 | 173 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
174 | struct device_node *np, |
175 | const char *bus_id, | |
176 | void *platform_data, | |
177 | struct device *parent) | |
5fd200f3 | 178 | { |
94a0cb1f | 179 | struct platform_device *dev; |
5fd200f3 | 180 | |
c6e126de PM |
181 | if (!of_device_is_available(np) || |
182 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
183 | return NULL; |
184 | ||
5fd200f3 GL |
185 | dev = of_device_alloc(np, bus_id, parent); |
186 | if (!dev) | |
c6e126de | 187 | goto err_clear_flag; |
5fd200f3 | 188 | |
eca39301 | 189 | dev->dev.bus = &platform_bus_type; |
15c3597d | 190 | dev->dev.platform_data = platform_data; |
1f5c69aa | 191 | of_dma_configure(&dev->dev, dev->dev.of_node); |
c706c239 | 192 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 193 | |
7096d042 | 194 | if (of_device_add(dev) != 0) { |
97890ba9 | 195 | of_dma_deconfigure(&dev->dev); |
7096d042 | 196 | platform_device_put(dev); |
c6e126de | 197 | goto err_clear_flag; |
5fd200f3 GL |
198 | } |
199 | ||
200 | return dev; | |
c6e126de PM |
201 | |
202 | err_clear_flag: | |
203 | of_node_clear_flag(np, OF_POPULATED); | |
204 | return NULL; | |
5fd200f3 | 205 | } |
15c3597d GL |
206 | |
207 | /** | |
208 | * of_platform_device_create - Alloc, initialize and register an of_device | |
209 | * @np: pointer to node to create device for | |
210 | * @bus_id: name to assign device | |
211 | * @parent: Linux device model parent device. | |
212 | * | |
213 | * Returns pointer to created platform device, or NULL if a device was not | |
214 | * registered. Unavailable devices will not get registered. | |
215 | */ | |
216 | struct platform_device *of_platform_device_create(struct device_node *np, | |
217 | const char *bus_id, | |
218 | struct device *parent) | |
219 | { | |
220 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
221 | } | |
5fd200f3 GL |
222 | EXPORT_SYMBOL(of_platform_device_create); |
223 | ||
5de1540b GL |
224 | #ifdef CONFIG_ARM_AMBA |
225 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
226 | const char *bus_id, | |
227 | void *platform_data, | |
228 | struct device *parent) | |
229 | { | |
230 | struct amba_device *dev; | |
231 | const void *prop; | |
232 | int i, ret; | |
233 | ||
234 | pr_debug("Creating amba device %s\n", node->full_name); | |
235 | ||
c6e126de PM |
236 | if (!of_device_is_available(node) || |
237 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
238 | return NULL; |
239 | ||
c0f72f8a | 240 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 241 | if (!dev) |
c6e126de | 242 | goto err_clear_flag; |
5de1540b GL |
243 | |
244 | /* setup generic device info */ | |
5de1540b | 245 | dev->dev.of_node = of_node_get(node); |
f94277af | 246 | dev->dev.fwnode = &node->fwnode; |
43c0767e | 247 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
248 | dev->dev.platform_data = platform_data; |
249 | if (bus_id) | |
250 | dev_set_name(&dev->dev, "%s", bus_id); | |
251 | else | |
252 | of_device_make_bus_id(&dev->dev); | |
1f5c69aa | 253 | of_dma_configure(&dev->dev, dev->dev.of_node); |
5de1540b | 254 | |
5de1540b GL |
255 | /* Allow the HW Peripheral ID to be overridden */ |
256 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
257 | if (prop) | |
258 | dev->periphid = of_read_ulong(prop, 1); | |
259 | ||
260 | /* Decode the IRQs and address ranges */ | |
261 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
262 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
263 | ||
264 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df | 265 | if (ret) { |
606ad42a RH |
266 | pr_err("amba: of_address_to_resource() failed (%d) for %s\n", |
267 | ret, node->full_name); | |
5de1540b | 268 | goto err_free; |
2bc552df | 269 | } |
5de1540b | 270 | |
c0f72f8a | 271 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 272 | if (ret) { |
606ad42a RH |
273 | pr_err("amba_device_add() failed (%d) for %s\n", |
274 | ret, node->full_name); | |
5de1540b | 275 | goto err_free; |
2bc552df | 276 | } |
5de1540b GL |
277 | |
278 | return dev; | |
279 | ||
280 | err_free: | |
c0f72f8a | 281 | amba_device_put(dev); |
c6e126de PM |
282 | err_clear_flag: |
283 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
284 | return NULL; |
285 | } | |
286 | #else /* CONFIG_ARM_AMBA */ | |
287 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
288 | const char *bus_id, | |
289 | void *platform_data, | |
290 | struct device *parent) | |
291 | { | |
292 | return NULL; | |
293 | } | |
294 | #endif /* CONFIG_ARM_AMBA */ | |
295 | ||
15c3597d GL |
296 | /** |
297 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
298 | */ | |
299 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
300 | struct device_node *np) | |
301 | { | |
fc5cf80a | 302 | const struct of_dev_auxdata *auxdata; |
15c3597d | 303 | struct resource res; |
fc5cf80a | 304 | int compatible = 0; |
303f59d1 OJ |
305 | |
306 | if (!lookup) | |
307 | return NULL; | |
308 | ||
fc5cf80a TL |
309 | auxdata = lookup; |
310 | for (; auxdata->compatible; auxdata++) { | |
311 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 312 | continue; |
fc5cf80a | 313 | compatible++; |
84774e61 | 314 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 315 | if (res.start != auxdata->phys_addr) |
84774e61 | 316 | continue; |
fc5cf80a TL |
317 | pr_debug("%s: devname=%s\n", np->full_name, auxdata->name); |
318 | return auxdata; | |
319 | } | |
320 | ||
321 | if (!compatible) | |
322 | return NULL; | |
323 | ||
324 | /* Try compatible match if no phys_addr and name are specified */ | |
325 | auxdata = lookup; | |
326 | for (; auxdata->compatible; auxdata++) { | |
327 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
328 | continue; | |
329 | if (!auxdata->phys_addr && !auxdata->name) { | |
330 | pr_debug("%s: compatible match\n", np->full_name); | |
331 | return auxdata; | |
332 | } | |
15c3597d | 333 | } |
303f59d1 | 334 | |
15c3597d GL |
335 | return NULL; |
336 | } | |
337 | ||
5fd200f3 | 338 | /** |
38e9e21d | 339 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 340 | * @bus: device node of the bus to instantiate |
1eed4c07 | 341 | * @matches: match table for bus nodes |
303f59d1 | 342 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 343 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 344 | * @strict: require compatible property |
38e9e21d GL |
345 | * |
346 | * Creates a platform_device for the provided device_node, and optionally | |
347 | * recursively create devices for all the child nodes. | |
5fd200f3 | 348 | */ |
38e9e21d | 349 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 350 | const struct of_device_id *matches, |
15c3597d | 351 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 352 | struct device *parent, bool strict) |
5fd200f3 | 353 | { |
15c3597d | 354 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 355 | struct device_node *child; |
94a0cb1f | 356 | struct platform_device *dev; |
15c3597d GL |
357 | const char *bus_id = NULL; |
358 | void *platform_data = NULL; | |
5fd200f3 GL |
359 | int rc = 0; |
360 | ||
29d4f8a4 GL |
361 | /* Make sure it has a compatible property */ |
362 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
363 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
364 | __func__, bus->full_name); | |
365 | return 0; | |
366 | } | |
367 | ||
44a7185c KW |
368 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
369 | pr_debug("%s() - skipping %s, already populated\n", | |
370 | __func__, bus->full_name); | |
371 | return 0; | |
372 | } | |
373 | ||
15c3597d GL |
374 | auxdata = of_dev_lookup(lookup, bus); |
375 | if (auxdata) { | |
376 | bus_id = auxdata->name; | |
377 | platform_data = auxdata->platform_data; | |
378 | } | |
379 | ||
5de1540b | 380 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
381 | /* |
382 | * Don't return an error here to keep compatibility with older | |
383 | * device tree files. | |
384 | */ | |
15c3597d | 385 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
386 | return 0; |
387 | } | |
388 | ||
15c3597d | 389 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
390 | if (!dev || !of_match_node(matches, bus)) |
391 | return 0; | |
392 | ||
5fd200f3 GL |
393 | for_each_child_of_node(bus, child) { |
394 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 395 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
396 | if (rc) { |
397 | of_node_put(child); | |
398 | break; | |
399 | } | |
400 | } | |
75f353b6 | 401 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
402 | return rc; |
403 | } | |
404 | ||
405 | /** | |
38e9e21d | 406 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 407 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 408 | * @matches: match table for bus nodes |
5fd200f3 GL |
409 | * @parent: parent to hook devices from, NULL for toplevel |
410 | * | |
411 | * Note that children of the provided root are not instantiated as devices | |
412 | * unless the specified root itself matches the bus list and is not NULL. | |
413 | */ | |
414 | int of_platform_bus_probe(struct device_node *root, | |
415 | const struct of_device_id *matches, | |
416 | struct device *parent) | |
417 | { | |
418 | struct device_node *child; | |
5fd200f3 GL |
419 | int rc = 0; |
420 | ||
1eed4c07 GL |
421 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
422 | if (!root) | |
60d59913 | 423 | return -EINVAL; |
5fd200f3 | 424 | |
44a7185c | 425 | pr_debug("%s()\n", __func__); |
5fd200f3 GL |
426 | pr_debug(" starting at: %s\n", root->full_name); |
427 | ||
1eed4c07 | 428 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 429 | if (of_match_node(matches, root)) { |
15c3597d | 430 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 431 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
432 | if (!of_match_node(matches, child)) |
433 | continue; | |
15c3597d | 434 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
435 | if (rc) { |
436 | of_node_put(child); | |
5fd200f3 | 437 | break; |
7fad948a | 438 | } |
5fd200f3 | 439 | } |
38e9e21d | 440 | |
5fd200f3 GL |
441 | of_node_put(root); |
442 | return rc; | |
443 | } | |
444 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
445 | |
446 | /** | |
447 | * of_platform_populate() - Populate platform_devices from device tree data | |
448 | * @root: parent of the first level to probe or NULL for the root of the tree | |
449 | * @matches: match table, NULL to use the default | |
92039ed1 | 450 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
451 | * @parent: parent to hook devices from, NULL for toplevel |
452 | * | |
453 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
454 | * and creates devices from nodes. It differs in that it follows the modern | |
455 | * convention of requiring all device nodes to have a 'compatible' property, | |
456 | * and it is suitable for creating devices which are children of the root | |
457 | * node (of_platform_bus_probe will only create children of the root which | |
458 | * are selected by the @matches argument). | |
459 | * | |
460 | * New board support should be using this function instead of | |
461 | * of_platform_bus_probe(). | |
462 | * | |
463 | * Returns 0 on success, < 0 on failure. | |
464 | */ | |
465 | int of_platform_populate(struct device_node *root, | |
466 | const struct of_device_id *matches, | |
15c3597d | 467 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
468 | struct device *parent) |
469 | { | |
470 | struct device_node *child; | |
471 | int rc = 0; | |
472 | ||
473 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
474 | if (!root) | |
475 | return -EINVAL; | |
476 | ||
44a7185c KW |
477 | pr_debug("%s()\n", __func__); |
478 | pr_debug(" starting at: %s\n", root->full_name); | |
479 | ||
29d4f8a4 | 480 | for_each_child_of_node(root, child) { |
15c3597d | 481 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
482 | if (rc) { |
483 | of_node_put(child); | |
29d4f8a4 | 484 | break; |
7fad948a | 485 | } |
29d4f8a4 | 486 | } |
2d0747c4 | 487 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
488 | |
489 | of_node_put(root); | |
490 | return rc; | |
491 | } | |
e001f1c8 | 492 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 493 | |
43443ad6 HM |
494 | int of_platform_default_populate(struct device_node *root, |
495 | const struct of_dev_auxdata *lookup, | |
496 | struct device *parent) | |
497 | { | |
498 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
499 | parent); | |
500 | } | |
501 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
502 | ||
fc520f8b | 503 | #ifndef CONFIG_PPC |
44a7185c KW |
504 | static int __init of_platform_default_populate_init(void) |
505 | { | |
529182e2 KC |
506 | struct device_node *node; |
507 | ||
508 | if (!of_have_populated_dt()) | |
509 | return -ENODEV; | |
510 | ||
511 | /* | |
512 | * Handle ramoops explicitly, since it is inside /reserved-memory, | |
513 | * which lacks a "compatible" property. | |
514 | */ | |
515 | node = of_find_node_by_path("/reserved-memory"); | |
516 | if (node) { | |
517 | node = of_find_compatible_node(node, NULL, "ramoops"); | |
518 | if (node) | |
519 | of_platform_device_create(node, NULL, NULL); | |
520 | } | |
521 | ||
522 | /* Populate everything else. */ | |
523 | of_platform_default_populate(NULL, NULL, NULL); | |
44a7185c KW |
524 | |
525 | return 0; | |
526 | } | |
527 | arch_initcall_sync(of_platform_default_populate_init); | |
fc520f8b | 528 | #endif |
44a7185c | 529 | |
c6e126de PM |
530 | static int of_platform_device_destroy(struct device *dev, void *data) |
531 | { | |
c6e126de | 532 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 533 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 534 | return 0; |
c6e126de | 535 | |
75f353b6 GL |
536 | /* Recurse for any nodes that were treated as busses */ |
537 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
538 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de PM |
539 | |
540 | if (dev->bus == &platform_bus_type) | |
541 | platform_device_unregister(to_platform_device(dev)); | |
542 | #ifdef CONFIG_ARM_AMBA | |
543 | else if (dev->bus == &amba_bustype) | |
544 | amba_device_unregister(to_amba_device(dev)); | |
545 | #endif | |
c6e126de | 546 | |
0495cb75 | 547 | of_dma_deconfigure(dev); |
c6e126de | 548 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
75f353b6 | 549 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
c6e126de PM |
550 | return 0; |
551 | } | |
552 | ||
553 | /** | |
554 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 555 | * @parent: device which children will be removed |
c6e126de PM |
556 | * |
557 | * Complementary to of_platform_populate(), this function removes children | |
558 | * of the given device (and, recurrently, their children) that have been | |
559 | * created from their respective device tree nodes (and only those, | |
560 | * leaving others - eg. manually created - unharmed). | |
561 | * | |
562 | * Returns 0 when all children devices have been removed or | |
563 | * -EBUSY when some children remained. | |
564 | */ | |
75f353b6 | 565 | void of_platform_depopulate(struct device *parent) |
c6e126de | 566 | { |
2d0747c4 GL |
567 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
568 | device_for_each_child(parent, NULL, of_platform_device_destroy); | |
569 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); | |
570 | } | |
c6e126de PM |
571 | } |
572 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
573 | ||
801d728c PA |
574 | #ifdef CONFIG_OF_DYNAMIC |
575 | static int of_platform_notify(struct notifier_block *nb, | |
576 | unsigned long action, void *arg) | |
577 | { | |
578 | struct of_reconfig_data *rd = arg; | |
579 | struct platform_device *pdev_parent, *pdev; | |
580 | bool children_left; | |
581 | ||
582 | switch (of_reconfig_get_state_change(action, rd)) { | |
583 | case OF_RECONFIG_CHANGE_ADD: | |
584 | /* verify that the parent is a bus */ | |
585 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
586 | return NOTIFY_OK; /* not for us */ | |
587 | ||
15204ab1 PA |
588 | /* already populated? (driver using of_populate manually) */ |
589 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
590 | return NOTIFY_OK; | |
591 | ||
801d728c PA |
592 | /* pdev_parent may be NULL when no bus platform device */ |
593 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
594 | pdev = of_platform_device_create(rd->dn, NULL, | |
595 | pdev_parent ? &pdev_parent->dev : NULL); | |
596 | of_dev_put(pdev_parent); | |
597 | ||
598 | if (pdev == NULL) { | |
599 | pr_err("%s: failed to create for '%s'\n", | |
600 | __func__, rd->dn->full_name); | |
601 | /* of_platform_device_create tosses the error code */ | |
602 | return notifier_from_errno(-EINVAL); | |
603 | } | |
604 | break; | |
605 | ||
606 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
607 | |
608 | /* already depopulated? */ | |
609 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
610 | return NOTIFY_OK; | |
611 | ||
801d728c PA |
612 | /* find our device by node */ |
613 | pdev = of_find_device_by_node(rd->dn); | |
614 | if (pdev == NULL) | |
615 | return NOTIFY_OK; /* no? not meant for us */ | |
616 | ||
617 | /* unregister takes one ref away */ | |
618 | of_platform_device_destroy(&pdev->dev, &children_left); | |
619 | ||
620 | /* and put the reference of the find */ | |
621 | of_dev_put(pdev); | |
622 | break; | |
623 | } | |
624 | ||
625 | return NOTIFY_OK; | |
626 | } | |
627 | ||
628 | static struct notifier_block platform_of_notifier = { | |
629 | .notifier_call = of_platform_notify, | |
630 | }; | |
631 | ||
632 | void of_platform_register_reconfig_notifier(void) | |
633 | { | |
634 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
635 | } | |
636 | #endif /* CONFIG_OF_DYNAMIC */ | |
637 | ||
964dba28 | 638 | #endif /* CONFIG_OF_ADDRESS */ |