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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 | * | |
4fb373df JH |
48 | * Takes a reference to the embedded struct device which needs to be dropped |
49 | * after use. | |
50 | * | |
c6085584 JB |
51 | * Returns platform_device pointer, or NULL if not found |
52 | */ | |
53 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
54 | { | |
55 | struct device *dev; | |
56 | ||
57 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
58 | return dev ? to_platform_device(dev) : NULL; | |
59 | } | |
60 | EXPORT_SYMBOL(of_find_device_by_node); | |
61 | ||
964dba28 | 62 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
63 | /* |
64 | * The following routines scan a subtree and registers a device for | |
65 | * each applicable node. | |
66 | * | |
67 | * Note: sparc doesn't use these routines because it has a different | |
68 | * mechanism for creating devices from device tree nodes. | |
69 | */ | |
70 | ||
94c09319 GL |
71 | /** |
72 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
73 | * @dev: pointer to device structure that is linked to a device tree node | |
74 | * | |
07e461cd GL |
75 | * This routine will first try using the translated bus address to |
76 | * derive a unique name. If it cannot, then it will prepend names from | |
77 | * parent nodes until a unique name can be derived. | |
94c09319 | 78 | */ |
e553f539 | 79 | static void of_device_make_bus_id(struct device *dev) |
94c09319 | 80 | { |
94c09319 | 81 | struct device_node *node = dev->of_node; |
24fb530f | 82 | const __be32 *reg; |
94c09319 | 83 | u64 addr; |
94c09319 | 84 | |
07e461cd GL |
85 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
86 | while (node->parent) { | |
87 | /* | |
88 | * If the address can be translated, then that is as much | |
89 | * uniqueness as we need. Make it the first component and return | |
90 | */ | |
91 | reg = of_get_property(node, "reg", NULL); | |
92 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { | |
93 | dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", | |
94 | (unsigned long long)addr, node->name, | |
95 | dev_name(dev)); | |
94c09319 GL |
96 | return; |
97 | } | |
94c09319 | 98 | |
07e461cd GL |
99 | /* format arguments only used if dev_name() resolves to NULL */ |
100 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", | |
101 | strrchr(node->full_name, '/') + 1, dev_name(dev)); | |
102 | node = node->parent; | |
103 | } | |
94c09319 GL |
104 | } |
105 | ||
106 | /** | |
107 | * of_device_alloc - Allocate and initialize an of_device | |
108 | * @np: device node to assign to device | |
109 | * @bus_id: Name to assign to the device. May be null to use default name. | |
110 | * @parent: Parent device. | |
111 | */ | |
94a0cb1f | 112 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
113 | const char *bus_id, |
114 | struct device *parent) | |
115 | { | |
94a0cb1f | 116 | struct platform_device *dev; |
52f6537c | 117 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
118 | struct resource *res, temp_res; |
119 | ||
7096d042 GL |
120 | dev = platform_device_alloc("", -1); |
121 | if (!dev) | |
122 | return NULL; | |
123 | ||
124 | /* count the io and irq resources */ | |
d9c6866b RH |
125 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
126 | num_reg++; | |
52f6537c | 127 | num_irq = of_irq_count(np); |
ac80a51e | 128 | |
ac80a51e GL |
129 | /* Populate the resource table */ |
130 | if (num_irq || num_reg) { | |
7096d042 GL |
131 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
132 | if (!res) { | |
133 | platform_device_put(dev); | |
134 | return NULL; | |
135 | } | |
136 | ||
ac80a51e GL |
137 | dev->num_resources = num_reg + num_irq; |
138 | dev->resource = res; | |
139 | for (i = 0; i < num_reg; i++, res++) { | |
140 | rc = of_address_to_resource(np, i, res); | |
141 | WARN_ON(rc); | |
142 | } | |
9ec36caf RH |
143 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
144 | pr_debug("not all legacy IRQ resources mapped for %s\n", | |
145 | np->name); | |
ac80a51e | 146 | } |
94c09319 GL |
147 | |
148 | dev->dev.of_node = of_node_get(np); | |
f94277af | 149 | dev->dev.fwnode = &np->fwnode; |
43c0767e | 150 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
151 | |
152 | if (bus_id) | |
153 | dev_set_name(&dev->dev, "%s", bus_id); | |
154 | else | |
155 | of_device_make_bus_id(&dev->dev); | |
156 | ||
157 | return dev; | |
158 | } | |
159 | EXPORT_SYMBOL(of_device_alloc); | |
160 | ||
97890ba9 WD |
161 | static void of_dma_deconfigure(struct device *dev) |
162 | { | |
163 | arch_teardown_dma_ops(dev); | |
591c1ee4 SS |
164 | } |
165 | ||
5fd200f3 | 166 | /** |
15c3597d | 167 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
168 | * @np: pointer to node to create device for |
169 | * @bus_id: name to assign device | |
15c3597d | 170 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 171 | * @parent: Linux device model parent device. |
cd1e6504 GL |
172 | * |
173 | * Returns pointer to created platform device, or NULL if a device was not | |
174 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 175 | */ |
245d9641 | 176 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
177 | struct device_node *np, |
178 | const char *bus_id, | |
179 | void *platform_data, | |
180 | struct device *parent) | |
5fd200f3 | 181 | { |
94a0cb1f | 182 | struct platform_device *dev; |
5fd200f3 | 183 | |
c6e126de PM |
184 | if (!of_device_is_available(np) || |
185 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
186 | return NULL; |
187 | ||
5fd200f3 GL |
188 | dev = of_device_alloc(np, bus_id, parent); |
189 | if (!dev) | |
c6e126de | 190 | goto err_clear_flag; |
5fd200f3 | 191 | |
eca39301 | 192 | dev->dev.bus = &platform_bus_type; |
15c3597d | 193 | dev->dev.platform_data = platform_data; |
1f5c69aa | 194 | of_dma_configure(&dev->dev, dev->dev.of_node); |
c706c239 | 195 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 196 | |
7096d042 | 197 | if (of_device_add(dev) != 0) { |
97890ba9 | 198 | of_dma_deconfigure(&dev->dev); |
7096d042 | 199 | platform_device_put(dev); |
c6e126de | 200 | goto err_clear_flag; |
5fd200f3 GL |
201 | } |
202 | ||
203 | return dev; | |
c6e126de PM |
204 | |
205 | err_clear_flag: | |
206 | of_node_clear_flag(np, OF_POPULATED); | |
207 | return NULL; | |
5fd200f3 | 208 | } |
15c3597d GL |
209 | |
210 | /** | |
211 | * of_platform_device_create - Alloc, initialize and register an of_device | |
212 | * @np: pointer to node to create device for | |
213 | * @bus_id: name to assign device | |
214 | * @parent: Linux device model parent device. | |
215 | * | |
216 | * Returns pointer to created platform device, or NULL if a device was not | |
217 | * registered. Unavailable devices will not get registered. | |
218 | */ | |
219 | struct platform_device *of_platform_device_create(struct device_node *np, | |
220 | const char *bus_id, | |
221 | struct device *parent) | |
222 | { | |
223 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
224 | } | |
5fd200f3 GL |
225 | EXPORT_SYMBOL(of_platform_device_create); |
226 | ||
5de1540b GL |
227 | #ifdef CONFIG_ARM_AMBA |
228 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
229 | const char *bus_id, | |
230 | void *platform_data, | |
231 | struct device *parent) | |
232 | { | |
233 | struct amba_device *dev; | |
234 | const void *prop; | |
235 | int i, ret; | |
236 | ||
237 | pr_debug("Creating amba device %s\n", node->full_name); | |
238 | ||
c6e126de PM |
239 | if (!of_device_is_available(node) || |
240 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
241 | return NULL; |
242 | ||
c0f72f8a | 243 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 244 | if (!dev) |
c6e126de | 245 | goto err_clear_flag; |
5de1540b GL |
246 | |
247 | /* setup generic device info */ | |
5de1540b | 248 | dev->dev.of_node = of_node_get(node); |
f94277af | 249 | dev->dev.fwnode = &node->fwnode; |
43c0767e | 250 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
251 | dev->dev.platform_data = platform_data; |
252 | if (bus_id) | |
253 | dev_set_name(&dev->dev, "%s", bus_id); | |
254 | else | |
255 | of_device_make_bus_id(&dev->dev); | |
1f5c69aa | 256 | of_dma_configure(&dev->dev, dev->dev.of_node); |
5de1540b | 257 | |
5de1540b GL |
258 | /* Allow the HW Peripheral ID to be overridden */ |
259 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
260 | if (prop) | |
261 | dev->periphid = of_read_ulong(prop, 1); | |
262 | ||
263 | /* Decode the IRQs and address ranges */ | |
264 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
265 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
266 | ||
267 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df | 268 | if (ret) { |
606ad42a RH |
269 | pr_err("amba: of_address_to_resource() failed (%d) for %s\n", |
270 | ret, node->full_name); | |
5de1540b | 271 | goto err_free; |
2bc552df | 272 | } |
5de1540b | 273 | |
c0f72f8a | 274 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 275 | if (ret) { |
606ad42a RH |
276 | pr_err("amba_device_add() failed (%d) for %s\n", |
277 | ret, node->full_name); | |
5de1540b | 278 | goto err_free; |
2bc552df | 279 | } |
5de1540b GL |
280 | |
281 | return dev; | |
282 | ||
283 | err_free: | |
c0f72f8a | 284 | amba_device_put(dev); |
c6e126de PM |
285 | err_clear_flag: |
286 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
287 | return NULL; |
288 | } | |
289 | #else /* CONFIG_ARM_AMBA */ | |
290 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
291 | const char *bus_id, | |
292 | void *platform_data, | |
293 | struct device *parent) | |
294 | { | |
295 | return NULL; | |
296 | } | |
297 | #endif /* CONFIG_ARM_AMBA */ | |
298 | ||
15c3597d GL |
299 | /** |
300 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
301 | */ | |
302 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
303 | struct device_node *np) | |
304 | { | |
fc5cf80a | 305 | const struct of_dev_auxdata *auxdata; |
15c3597d | 306 | struct resource res; |
fc5cf80a | 307 | int compatible = 0; |
303f59d1 OJ |
308 | |
309 | if (!lookup) | |
310 | return NULL; | |
311 | ||
fc5cf80a TL |
312 | auxdata = lookup; |
313 | for (; auxdata->compatible; auxdata++) { | |
314 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 315 | continue; |
fc5cf80a | 316 | compatible++; |
84774e61 | 317 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 318 | if (res.start != auxdata->phys_addr) |
84774e61 | 319 | continue; |
fc5cf80a TL |
320 | pr_debug("%s: devname=%s\n", np->full_name, auxdata->name); |
321 | return auxdata; | |
322 | } | |
323 | ||
324 | if (!compatible) | |
325 | return NULL; | |
326 | ||
327 | /* Try compatible match if no phys_addr and name are specified */ | |
328 | auxdata = lookup; | |
329 | for (; auxdata->compatible; auxdata++) { | |
330 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
331 | continue; | |
332 | if (!auxdata->phys_addr && !auxdata->name) { | |
333 | pr_debug("%s: compatible match\n", np->full_name); | |
334 | return auxdata; | |
335 | } | |
15c3597d | 336 | } |
303f59d1 | 337 | |
15c3597d GL |
338 | return NULL; |
339 | } | |
340 | ||
5fd200f3 | 341 | /** |
38e9e21d | 342 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 343 | * @bus: device node of the bus to instantiate |
1eed4c07 | 344 | * @matches: match table for bus nodes |
303f59d1 | 345 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 346 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 347 | * @strict: require compatible property |
38e9e21d GL |
348 | * |
349 | * Creates a platform_device for the provided device_node, and optionally | |
350 | * recursively create devices for all the child nodes. | |
5fd200f3 | 351 | */ |
38e9e21d | 352 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 353 | const struct of_device_id *matches, |
15c3597d | 354 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 355 | struct device *parent, bool strict) |
5fd200f3 | 356 | { |
15c3597d | 357 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 358 | struct device_node *child; |
94a0cb1f | 359 | struct platform_device *dev; |
15c3597d GL |
360 | const char *bus_id = NULL; |
361 | void *platform_data = NULL; | |
5fd200f3 GL |
362 | int rc = 0; |
363 | ||
29d4f8a4 GL |
364 | /* Make sure it has a compatible property */ |
365 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
366 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
367 | __func__, bus->full_name); | |
368 | return 0; | |
369 | } | |
370 | ||
44a7185c KW |
371 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
372 | pr_debug("%s() - skipping %s, already populated\n", | |
373 | __func__, bus->full_name); | |
374 | return 0; | |
375 | } | |
376 | ||
15c3597d GL |
377 | auxdata = of_dev_lookup(lookup, bus); |
378 | if (auxdata) { | |
379 | bus_id = auxdata->name; | |
380 | platform_data = auxdata->platform_data; | |
381 | } | |
382 | ||
5de1540b | 383 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
384 | /* |
385 | * Don't return an error here to keep compatibility with older | |
386 | * device tree files. | |
387 | */ | |
15c3597d | 388 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
389 | return 0; |
390 | } | |
391 | ||
15c3597d | 392 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
393 | if (!dev || !of_match_node(matches, bus)) |
394 | return 0; | |
395 | ||
5fd200f3 GL |
396 | for_each_child_of_node(bus, child) { |
397 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 398 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
399 | if (rc) { |
400 | of_node_put(child); | |
401 | break; | |
402 | } | |
403 | } | |
75f353b6 | 404 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
405 | return rc; |
406 | } | |
407 | ||
408 | /** | |
38e9e21d | 409 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 410 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 411 | * @matches: match table for bus nodes |
5fd200f3 GL |
412 | * @parent: parent to hook devices from, NULL for toplevel |
413 | * | |
414 | * Note that children of the provided root are not instantiated as devices | |
415 | * unless the specified root itself matches the bus list and is not NULL. | |
416 | */ | |
417 | int of_platform_bus_probe(struct device_node *root, | |
418 | const struct of_device_id *matches, | |
419 | struct device *parent) | |
420 | { | |
421 | struct device_node *child; | |
5fd200f3 GL |
422 | int rc = 0; |
423 | ||
1eed4c07 GL |
424 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
425 | if (!root) | |
60d59913 | 426 | return -EINVAL; |
5fd200f3 | 427 | |
44a7185c | 428 | pr_debug("%s()\n", __func__); |
5fd200f3 GL |
429 | pr_debug(" starting at: %s\n", root->full_name); |
430 | ||
1eed4c07 | 431 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 432 | if (of_match_node(matches, root)) { |
15c3597d | 433 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 434 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
435 | if (!of_match_node(matches, child)) |
436 | continue; | |
15c3597d | 437 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
438 | if (rc) { |
439 | of_node_put(child); | |
5fd200f3 | 440 | break; |
7fad948a | 441 | } |
5fd200f3 | 442 | } |
38e9e21d | 443 | |
5fd200f3 GL |
444 | of_node_put(root); |
445 | return rc; | |
446 | } | |
447 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
448 | |
449 | /** | |
450 | * of_platform_populate() - Populate platform_devices from device tree data | |
451 | * @root: parent of the first level to probe or NULL for the root of the tree | |
452 | * @matches: match table, NULL to use the default | |
92039ed1 | 453 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
454 | * @parent: parent to hook devices from, NULL for toplevel |
455 | * | |
456 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
457 | * and creates devices from nodes. It differs in that it follows the modern | |
458 | * convention of requiring all device nodes to have a 'compatible' property, | |
459 | * and it is suitable for creating devices which are children of the root | |
460 | * node (of_platform_bus_probe will only create children of the root which | |
461 | * are selected by the @matches argument). | |
462 | * | |
463 | * New board support should be using this function instead of | |
464 | * of_platform_bus_probe(). | |
465 | * | |
466 | * Returns 0 on success, < 0 on failure. | |
467 | */ | |
468 | int of_platform_populate(struct device_node *root, | |
469 | const struct of_device_id *matches, | |
15c3597d | 470 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
471 | struct device *parent) |
472 | { | |
473 | struct device_node *child; | |
474 | int rc = 0; | |
475 | ||
476 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
477 | if (!root) | |
478 | return -EINVAL; | |
479 | ||
44a7185c KW |
480 | pr_debug("%s()\n", __func__); |
481 | pr_debug(" starting at: %s\n", root->full_name); | |
482 | ||
29d4f8a4 | 483 | for_each_child_of_node(root, child) { |
15c3597d | 484 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
485 | if (rc) { |
486 | of_node_put(child); | |
29d4f8a4 | 487 | break; |
7fad948a | 488 | } |
29d4f8a4 | 489 | } |
2d0747c4 | 490 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
491 | |
492 | of_node_put(root); | |
493 | return rc; | |
494 | } | |
e001f1c8 | 495 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 496 | |
43443ad6 HM |
497 | int of_platform_default_populate(struct device_node *root, |
498 | const struct of_dev_auxdata *lookup, | |
499 | struct device *parent) | |
500 | { | |
501 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
502 | parent); | |
503 | } | |
504 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
505 | ||
fc520f8b | 506 | #ifndef CONFIG_PPC |
44a7185c KW |
507 | static int __init of_platform_default_populate_init(void) |
508 | { | |
529182e2 KC |
509 | struct device_node *node; |
510 | ||
511 | if (!of_have_populated_dt()) | |
512 | return -ENODEV; | |
513 | ||
514 | /* | |
515 | * Handle ramoops explicitly, since it is inside /reserved-memory, | |
516 | * which lacks a "compatible" property. | |
517 | */ | |
518 | node = of_find_node_by_path("/reserved-memory"); | |
519 | if (node) { | |
520 | node = of_find_compatible_node(node, NULL, "ramoops"); | |
521 | if (node) | |
522 | of_platform_device_create(node, NULL, NULL); | |
523 | } | |
524 | ||
525 | /* Populate everything else. */ | |
526 | of_platform_default_populate(NULL, NULL, NULL); | |
44a7185c KW |
527 | |
528 | return 0; | |
529 | } | |
530 | arch_initcall_sync(of_platform_default_populate_init); | |
fc520f8b | 531 | #endif |
44a7185c | 532 | |
c6e126de PM |
533 | static int of_platform_device_destroy(struct device *dev, void *data) |
534 | { | |
c6e126de | 535 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 536 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 537 | return 0; |
c6e126de | 538 | |
75f353b6 GL |
539 | /* Recurse for any nodes that were treated as busses */ |
540 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
541 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de PM |
542 | |
543 | if (dev->bus == &platform_bus_type) | |
544 | platform_device_unregister(to_platform_device(dev)); | |
545 | #ifdef CONFIG_ARM_AMBA | |
546 | else if (dev->bus == &amba_bustype) | |
547 | amba_device_unregister(to_amba_device(dev)); | |
548 | #endif | |
c6e126de | 549 | |
0495cb75 | 550 | of_dma_deconfigure(dev); |
c6e126de | 551 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
75f353b6 | 552 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
c6e126de PM |
553 | return 0; |
554 | } | |
555 | ||
556 | /** | |
557 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 558 | * @parent: device which children will be removed |
c6e126de PM |
559 | * |
560 | * Complementary to of_platform_populate(), this function removes children | |
561 | * of the given device (and, recurrently, their children) that have been | |
562 | * created from their respective device tree nodes (and only those, | |
563 | * leaving others - eg. manually created - unharmed). | |
c6e126de | 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 */ |