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