]>
Commit | Line | Data |
---|---|---|
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 | */ | |
14 | #include <linux/errno.h> | |
5c457083 | 15 | #include <linux/module.h> |
5de1540b | 16 | #include <linux/amba/bus.h> |
3f23de10 | 17 | #include <linux/device.h> |
5fd200f3 | 18 | #include <linux/dma-mapping.h> |
50ef5284 | 19 | #include <linux/slab.h> |
9e3288dc | 20 | #include <linux/of_address.h> |
3f23de10 | 21 | #include <linux/of_device.h> |
9e3288dc | 22 | #include <linux/of_irq.h> |
3f23de10 | 23 | #include <linux/of_platform.h> |
eca39301 GL |
24 | #include <linux/platform_device.h> |
25 | ||
cbb49c26 GL |
26 | const struct of_device_id of_default_bus_match_table[] = { |
27 | { .compatible = "simple-bus", }, | |
22869a9e | 28 | { .compatible = "simple-mfd", }, |
cbb49c26 GL |
29 | #ifdef CONFIG_ARM_AMBA |
30 | { .compatible = "arm,amba-bus", }, | |
31 | #endif /* CONFIG_ARM_AMBA */ | |
32 | {} /* Empty terminated list */ | |
33 | }; | |
b80443c2 | 34 | EXPORT_SYMBOL(of_default_bus_match_table); |
cbb49c26 | 35 | |
c6085584 JB |
36 | static int of_dev_node_match(struct device *dev, void *data) |
37 | { | |
38 | return dev->of_node == data; | |
39 | } | |
40 | ||
41 | /** | |
42 | * of_find_device_by_node - Find the platform_device associated with a node | |
43 | * @np: Pointer to device tree node | |
44 | * | |
45 | * Returns platform_device pointer, or NULL if not found | |
46 | */ | |
47 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
48 | { | |
49 | struct device *dev; | |
50 | ||
51 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
52 | return dev ? to_platform_device(dev) : NULL; | |
53 | } | |
54 | EXPORT_SYMBOL(of_find_device_by_node); | |
55 | ||
964dba28 | 56 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
57 | /* |
58 | * The following routines scan a subtree and registers a device for | |
59 | * each applicable node. | |
60 | * | |
61 | * Note: sparc doesn't use these routines because it has a different | |
62 | * mechanism for creating devices from device tree nodes. | |
63 | */ | |
64 | ||
94c09319 GL |
65 | /** |
66 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
67 | * @dev: pointer to device structure that is linked to a device tree node | |
68 | * | |
07e461cd GL |
69 | * This routine will first try using the translated bus address to |
70 | * derive a unique name. If it cannot, then it will prepend names from | |
71 | * parent nodes until a unique name can be derived. | |
94c09319 | 72 | */ |
c6601225 | 73 | void of_device_make_bus_id(struct device *dev) |
94c09319 | 74 | { |
94c09319 | 75 | struct device_node *node = dev->of_node; |
24fb530f | 76 | const __be32 *reg; |
94c09319 | 77 | u64 addr; |
94c09319 | 78 | |
07e461cd GL |
79 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
80 | while (node->parent) { | |
81 | /* | |
82 | * If the address can be translated, then that is as much | |
83 | * uniqueness as we need. Make it the first component and return | |
84 | */ | |
85 | reg = of_get_property(node, "reg", NULL); | |
86 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { | |
87 | dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", | |
88 | (unsigned long long)addr, node->name, | |
89 | dev_name(dev)); | |
94c09319 GL |
90 | return; |
91 | } | |
94c09319 | 92 | |
07e461cd GL |
93 | /* format arguments only used if dev_name() resolves to NULL */ |
94 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", | |
95 | strrchr(node->full_name, '/') + 1, dev_name(dev)); | |
96 | node = node->parent; | |
97 | } | |
94c09319 GL |
98 | } |
99 | ||
100 | /** | |
101 | * of_device_alloc - Allocate and initialize an of_device | |
102 | * @np: device node to assign to device | |
103 | * @bus_id: Name to assign to the device. May be null to use default name. | |
104 | * @parent: Parent device. | |
105 | */ | |
94a0cb1f | 106 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
107 | const char *bus_id, |
108 | struct device *parent) | |
109 | { | |
94a0cb1f | 110 | struct platform_device *dev; |
52f6537c | 111 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
112 | struct resource *res, temp_res; |
113 | ||
7096d042 GL |
114 | dev = platform_device_alloc("", -1); |
115 | if (!dev) | |
116 | return NULL; | |
117 | ||
118 | /* count the io and irq resources */ | |
d9c6866b RH |
119 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
120 | num_reg++; | |
52f6537c | 121 | num_irq = of_irq_count(np); |
ac80a51e | 122 | |
ac80a51e GL |
123 | /* Populate the resource table */ |
124 | if (num_irq || num_reg) { | |
7096d042 GL |
125 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
126 | if (!res) { | |
127 | platform_device_put(dev); | |
128 | return NULL; | |
129 | } | |
130 | ||
ac80a51e GL |
131 | dev->num_resources = num_reg + num_irq; |
132 | dev->resource = res; | |
133 | for (i = 0; i < num_reg; i++, res++) { | |
134 | rc = of_address_to_resource(np, i, res); | |
135 | WARN_ON(rc); | |
136 | } | |
9ec36caf RH |
137 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
138 | pr_debug("not all legacy IRQ resources mapped for %s\n", | |
139 | np->name); | |
ac80a51e | 140 | } |
94c09319 GL |
141 | |
142 | dev->dev.of_node = of_node_get(np); | |
43c0767e | 143 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
144 | |
145 | if (bus_id) | |
146 | dev_set_name(&dev->dev, "%s", bus_id); | |
147 | else | |
148 | of_device_make_bus_id(&dev->dev); | |
149 | ||
150 | return dev; | |
151 | } | |
152 | EXPORT_SYMBOL(of_device_alloc); | |
153 | ||
97890ba9 WD |
154 | static void of_dma_deconfigure(struct device *dev) |
155 | { | |
156 | arch_teardown_dma_ops(dev); | |
591c1ee4 SS |
157 | } |
158 | ||
5fd200f3 | 159 | /** |
15c3597d | 160 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
161 | * @np: pointer to node to create device for |
162 | * @bus_id: name to assign device | |
15c3597d | 163 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 164 | * @parent: Linux device model parent device. |
cd1e6504 GL |
165 | * |
166 | * Returns pointer to created platform device, or NULL if a device was not | |
167 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 168 | */ |
245d9641 | 169 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
170 | struct device_node *np, |
171 | const char *bus_id, | |
172 | void *platform_data, | |
173 | struct device *parent) | |
5fd200f3 | 174 | { |
94a0cb1f | 175 | struct platform_device *dev; |
5fd200f3 | 176 | |
c6e126de PM |
177 | if (!of_device_is_available(np) || |
178 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
179 | return NULL; |
180 | ||
5fd200f3 GL |
181 | dev = of_device_alloc(np, bus_id, parent); |
182 | if (!dev) | |
c6e126de | 183 | goto err_clear_flag; |
5fd200f3 | 184 | |
eca39301 | 185 | dev->dev.bus = &platform_bus_type; |
15c3597d | 186 | dev->dev.platform_data = platform_data; |
1f5c69aa | 187 | of_dma_configure(&dev->dev, dev->dev.of_node); |
c706c239 | 188 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 189 | |
7096d042 | 190 | if (of_device_add(dev) != 0) { |
97890ba9 | 191 | of_dma_deconfigure(&dev->dev); |
7096d042 | 192 | platform_device_put(dev); |
c6e126de | 193 | goto err_clear_flag; |
5fd200f3 GL |
194 | } |
195 | ||
196 | return dev; | |
c6e126de PM |
197 | |
198 | err_clear_flag: | |
199 | of_node_clear_flag(np, OF_POPULATED); | |
200 | return NULL; | |
5fd200f3 | 201 | } |
15c3597d GL |
202 | |
203 | /** | |
204 | * of_platform_device_create - Alloc, initialize and register an of_device | |
205 | * @np: pointer to node to create device for | |
206 | * @bus_id: name to assign device | |
207 | * @parent: Linux device model parent device. | |
208 | * | |
209 | * Returns pointer to created platform device, or NULL if a device was not | |
210 | * registered. Unavailable devices will not get registered. | |
211 | */ | |
212 | struct platform_device *of_platform_device_create(struct device_node *np, | |
213 | const char *bus_id, | |
214 | struct device *parent) | |
215 | { | |
216 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
217 | } | |
5fd200f3 GL |
218 | EXPORT_SYMBOL(of_platform_device_create); |
219 | ||
5de1540b GL |
220 | #ifdef CONFIG_ARM_AMBA |
221 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
222 | const char *bus_id, | |
223 | void *platform_data, | |
224 | struct device *parent) | |
225 | { | |
226 | struct amba_device *dev; | |
227 | const void *prop; | |
228 | int i, ret; | |
229 | ||
230 | pr_debug("Creating amba device %s\n", node->full_name); | |
231 | ||
c6e126de PM |
232 | if (!of_device_is_available(node) || |
233 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
234 | return NULL; |
235 | ||
c0f72f8a | 236 | dev = amba_device_alloc(NULL, 0, 0); |
2bc552df BZ |
237 | if (!dev) { |
238 | pr_err("%s(): amba_device_alloc() failed for %s\n", | |
239 | __func__, node->full_name); | |
c6e126de | 240 | goto err_clear_flag; |
2bc552df | 241 | } |
5de1540b GL |
242 | |
243 | /* setup generic device info */ | |
5de1540b | 244 | dev->dev.of_node = of_node_get(node); |
43c0767e | 245 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
246 | dev->dev.platform_data = platform_data; |
247 | if (bus_id) | |
248 | dev_set_name(&dev->dev, "%s", bus_id); | |
249 | else | |
250 | of_device_make_bus_id(&dev->dev); | |
1f5c69aa | 251 | of_dma_configure(&dev->dev, dev->dev.of_node); |
5de1540b | 252 | |
5de1540b GL |
253 | /* Allow the HW Peripheral ID to be overridden */ |
254 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
255 | if (prop) | |
256 | dev->periphid = of_read_ulong(prop, 1); | |
257 | ||
258 | /* Decode the IRQs and address ranges */ | |
259 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
260 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
261 | ||
262 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df BZ |
263 | if (ret) { |
264 | pr_err("%s(): of_address_to_resource() failed (%d) for %s\n", | |
265 | __func__, ret, node->full_name); | |
5de1540b | 266 | goto err_free; |
2bc552df | 267 | } |
5de1540b | 268 | |
c0f72f8a | 269 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df BZ |
270 | if (ret) { |
271 | pr_err("%s(): amba_device_add() failed (%d) for %s\n", | |
272 | __func__, ret, node->full_name); | |
5de1540b | 273 | goto err_free; |
2bc552df | 274 | } |
5de1540b GL |
275 | |
276 | return dev; | |
277 | ||
278 | err_free: | |
c0f72f8a | 279 | amba_device_put(dev); |
c6e126de PM |
280 | err_clear_flag: |
281 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
282 | return NULL; |
283 | } | |
284 | #else /* CONFIG_ARM_AMBA */ | |
285 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
286 | const char *bus_id, | |
287 | void *platform_data, | |
288 | struct device *parent) | |
289 | { | |
290 | return NULL; | |
291 | } | |
292 | #endif /* CONFIG_ARM_AMBA */ | |
293 | ||
15c3597d GL |
294 | /** |
295 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
296 | */ | |
297 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
298 | struct device_node *np) | |
299 | { | |
fc5cf80a | 300 | const struct of_dev_auxdata *auxdata; |
15c3597d | 301 | struct resource res; |
fc5cf80a | 302 | int compatible = 0; |
303f59d1 OJ |
303 | |
304 | if (!lookup) | |
305 | return NULL; | |
306 | ||
fc5cf80a TL |
307 | auxdata = lookup; |
308 | for (; auxdata->compatible; auxdata++) { | |
309 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 310 | continue; |
fc5cf80a | 311 | compatible++; |
84774e61 | 312 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 313 | if (res.start != auxdata->phys_addr) |
84774e61 | 314 | continue; |
fc5cf80a TL |
315 | pr_debug("%s: devname=%s\n", np->full_name, auxdata->name); |
316 | return auxdata; | |
317 | } | |
318 | ||
319 | if (!compatible) | |
320 | return NULL; | |
321 | ||
322 | /* Try compatible match if no phys_addr and name are specified */ | |
323 | auxdata = lookup; | |
324 | for (; auxdata->compatible; auxdata++) { | |
325 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
326 | continue; | |
327 | if (!auxdata->phys_addr && !auxdata->name) { | |
328 | pr_debug("%s: compatible match\n", np->full_name); | |
329 | return auxdata; | |
330 | } | |
15c3597d | 331 | } |
303f59d1 | 332 | |
15c3597d GL |
333 | return NULL; |
334 | } | |
335 | ||
5fd200f3 | 336 | /** |
38e9e21d | 337 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 338 | * @bus: device node of the bus to instantiate |
1eed4c07 | 339 | * @matches: match table for bus nodes |
303f59d1 | 340 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 341 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 342 | * @strict: require compatible property |
38e9e21d GL |
343 | * |
344 | * Creates a platform_device for the provided device_node, and optionally | |
345 | * recursively create devices for all the child nodes. | |
5fd200f3 | 346 | */ |
38e9e21d | 347 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 348 | const struct of_device_id *matches, |
15c3597d | 349 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 350 | struct device *parent, bool strict) |
5fd200f3 | 351 | { |
15c3597d | 352 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 353 | struct device_node *child; |
94a0cb1f | 354 | struct platform_device *dev; |
15c3597d GL |
355 | const char *bus_id = NULL; |
356 | void *platform_data = NULL; | |
5fd200f3 GL |
357 | int rc = 0; |
358 | ||
29d4f8a4 GL |
359 | /* Make sure it has a compatible property */ |
360 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
361 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
362 | __func__, bus->full_name); | |
363 | return 0; | |
364 | } | |
365 | ||
15c3597d GL |
366 | auxdata = of_dev_lookup(lookup, bus); |
367 | if (auxdata) { | |
368 | bus_id = auxdata->name; | |
369 | platform_data = auxdata->platform_data; | |
370 | } | |
371 | ||
5de1540b | 372 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
373 | /* |
374 | * Don't return an error here to keep compatibility with older | |
375 | * device tree files. | |
376 | */ | |
15c3597d | 377 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
378 | return 0; |
379 | } | |
380 | ||
15c3597d | 381 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
382 | if (!dev || !of_match_node(matches, bus)) |
383 | return 0; | |
384 | ||
5fd200f3 GL |
385 | for_each_child_of_node(bus, child) { |
386 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 387 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
388 | if (rc) { |
389 | of_node_put(child); | |
390 | break; | |
391 | } | |
392 | } | |
75f353b6 | 393 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
394 | return rc; |
395 | } | |
396 | ||
397 | /** | |
38e9e21d | 398 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 399 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 400 | * @matches: match table for bus nodes |
5fd200f3 GL |
401 | * @parent: parent to hook devices from, NULL for toplevel |
402 | * | |
403 | * Note that children of the provided root are not instantiated as devices | |
404 | * unless the specified root itself matches the bus list and is not NULL. | |
405 | */ | |
406 | int of_platform_bus_probe(struct device_node *root, | |
407 | const struct of_device_id *matches, | |
408 | struct device *parent) | |
409 | { | |
410 | struct device_node *child; | |
5fd200f3 GL |
411 | int rc = 0; |
412 | ||
1eed4c07 GL |
413 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
414 | if (!root) | |
60d59913 | 415 | return -EINVAL; |
5fd200f3 GL |
416 | |
417 | pr_debug("of_platform_bus_probe()\n"); | |
418 | pr_debug(" starting at: %s\n", root->full_name); | |
419 | ||
1eed4c07 | 420 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 421 | if (of_match_node(matches, root)) { |
15c3597d | 422 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 423 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
424 | if (!of_match_node(matches, child)) |
425 | continue; | |
15c3597d | 426 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
427 | if (rc) { |
428 | of_node_put(child); | |
5fd200f3 | 429 | break; |
7fad948a | 430 | } |
5fd200f3 | 431 | } |
38e9e21d | 432 | |
5fd200f3 GL |
433 | of_node_put(root); |
434 | return rc; | |
435 | } | |
436 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
437 | |
438 | /** | |
439 | * of_platform_populate() - Populate platform_devices from device tree data | |
440 | * @root: parent of the first level to probe or NULL for the root of the tree | |
441 | * @matches: match table, NULL to use the default | |
92039ed1 | 442 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
443 | * @parent: parent to hook devices from, NULL for toplevel |
444 | * | |
445 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
446 | * and creates devices from nodes. It differs in that it follows the modern | |
447 | * convention of requiring all device nodes to have a 'compatible' property, | |
448 | * and it is suitable for creating devices which are children of the root | |
449 | * node (of_platform_bus_probe will only create children of the root which | |
450 | * are selected by the @matches argument). | |
451 | * | |
452 | * New board support should be using this function instead of | |
453 | * of_platform_bus_probe(). | |
454 | * | |
455 | * Returns 0 on success, < 0 on failure. | |
456 | */ | |
457 | int of_platform_populate(struct device_node *root, | |
458 | const struct of_device_id *matches, | |
15c3597d | 459 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
460 | struct device *parent) |
461 | { | |
462 | struct device_node *child; | |
463 | int rc = 0; | |
464 | ||
465 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
466 | if (!root) | |
467 | return -EINVAL; | |
468 | ||
469 | for_each_child_of_node(root, child) { | |
15c3597d | 470 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
471 | if (rc) { |
472 | of_node_put(child); | |
29d4f8a4 | 473 | break; |
7fad948a | 474 | } |
29d4f8a4 | 475 | } |
2d0747c4 | 476 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
477 | |
478 | of_node_put(root); | |
479 | return rc; | |
480 | } | |
e001f1c8 | 481 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 482 | |
43443ad6 HM |
483 | int of_platform_default_populate(struct device_node *root, |
484 | const struct of_dev_auxdata *lookup, | |
485 | struct device *parent) | |
486 | { | |
487 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
488 | parent); | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
491 | ||
c6e126de PM |
492 | static int of_platform_device_destroy(struct device *dev, void *data) |
493 | { | |
c6e126de | 494 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 495 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 496 | return 0; |
c6e126de | 497 | |
75f353b6 GL |
498 | /* Recurse for any nodes that were treated as busses */ |
499 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
500 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de PM |
501 | |
502 | if (dev->bus == &platform_bus_type) | |
503 | platform_device_unregister(to_platform_device(dev)); | |
504 | #ifdef CONFIG_ARM_AMBA | |
505 | else if (dev->bus == &amba_bustype) | |
506 | amba_device_unregister(to_amba_device(dev)); | |
507 | #endif | |
c6e126de | 508 | |
0495cb75 | 509 | of_dma_deconfigure(dev); |
c6e126de | 510 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
75f353b6 | 511 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
c6e126de PM |
512 | return 0; |
513 | } | |
514 | ||
515 | /** | |
516 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 517 | * @parent: device which children will be removed |
c6e126de PM |
518 | * |
519 | * Complementary to of_platform_populate(), this function removes children | |
520 | * of the given device (and, recurrently, their children) that have been | |
521 | * created from their respective device tree nodes (and only those, | |
522 | * leaving others - eg. manually created - unharmed). | |
523 | * | |
524 | * Returns 0 when all children devices have been removed or | |
525 | * -EBUSY when some children remained. | |
526 | */ | |
75f353b6 | 527 | void of_platform_depopulate(struct device *parent) |
c6e126de | 528 | { |
2d0747c4 GL |
529 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
530 | device_for_each_child(parent, NULL, of_platform_device_destroy); | |
531 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); | |
532 | } | |
c6e126de PM |
533 | } |
534 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
535 | ||
801d728c PA |
536 | #ifdef CONFIG_OF_DYNAMIC |
537 | static int of_platform_notify(struct notifier_block *nb, | |
538 | unsigned long action, void *arg) | |
539 | { | |
540 | struct of_reconfig_data *rd = arg; | |
541 | struct platform_device *pdev_parent, *pdev; | |
542 | bool children_left; | |
543 | ||
544 | switch (of_reconfig_get_state_change(action, rd)) { | |
545 | case OF_RECONFIG_CHANGE_ADD: | |
546 | /* verify that the parent is a bus */ | |
547 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
548 | return NOTIFY_OK; /* not for us */ | |
549 | ||
15204ab1 PA |
550 | /* already populated? (driver using of_populate manually) */ |
551 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
552 | return NOTIFY_OK; | |
553 | ||
801d728c PA |
554 | /* pdev_parent may be NULL when no bus platform device */ |
555 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
556 | pdev = of_platform_device_create(rd->dn, NULL, | |
557 | pdev_parent ? &pdev_parent->dev : NULL); | |
558 | of_dev_put(pdev_parent); | |
559 | ||
560 | if (pdev == NULL) { | |
561 | pr_err("%s: failed to create for '%s'\n", | |
562 | __func__, rd->dn->full_name); | |
563 | /* of_platform_device_create tosses the error code */ | |
564 | return notifier_from_errno(-EINVAL); | |
565 | } | |
566 | break; | |
567 | ||
568 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
569 | |
570 | /* already depopulated? */ | |
571 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
572 | return NOTIFY_OK; | |
573 | ||
801d728c PA |
574 | /* find our device by node */ |
575 | pdev = of_find_device_by_node(rd->dn); | |
576 | if (pdev == NULL) | |
577 | return NOTIFY_OK; /* no? not meant for us */ | |
578 | ||
579 | /* unregister takes one ref away */ | |
580 | of_platform_device_destroy(&pdev->dev, &children_left); | |
581 | ||
582 | /* and put the reference of the find */ | |
583 | of_dev_put(pdev); | |
584 | break; | |
585 | } | |
586 | ||
587 | return NOTIFY_OK; | |
588 | } | |
589 | ||
590 | static struct notifier_block platform_of_notifier = { | |
591 | .notifier_call = of_platform_notify, | |
592 | }; | |
593 | ||
594 | void of_platform_register_reconfig_notifier(void) | |
595 | { | |
596 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
597 | } | |
598 | #endif /* CONFIG_OF_DYNAMIC */ | |
599 | ||
964dba28 | 600 | #endif /* CONFIG_OF_ADDRESS */ |