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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0+ |
3f23de10 SR |
2 | /* |
3 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
4 | * <benh@kernel.crashing.org> | |
5 | * and Arnd Bergmann, IBM Corp. | |
6 | * Merged from powerpc/kernel/of_platform.c and | |
7 | * sparc{,64}/kernel/of_device.c by Stephen Rothwell | |
3f23de10 | 8 | */ |
606ad42a RH |
9 | |
10 | #define pr_fmt(fmt) "OF: " fmt | |
11 | ||
3f23de10 | 12 | #include <linux/errno.h> |
5c457083 | 13 | #include <linux/module.h> |
5de1540b | 14 | #include <linux/amba/bus.h> |
3f23de10 | 15 | #include <linux/device.h> |
5fd200f3 | 16 | #include <linux/dma-mapping.h> |
50ef5284 | 17 | #include <linux/slab.h> |
9e3288dc | 18 | #include <linux/of_address.h> |
3f23de10 | 19 | #include <linux/of_device.h> |
09515ef5 | 20 | #include <linux/of_iommu.h> |
9e3288dc | 21 | #include <linux/of_irq.h> |
3f23de10 | 22 | #include <linux/of_platform.h> |
eca39301 GL |
23 | #include <linux/platform_device.h> |
24 | ||
cbb49c26 GL |
25 | const struct of_device_id of_default_bus_match_table[] = { |
26 | { .compatible = "simple-bus", }, | |
22869a9e | 27 | { .compatible = "simple-mfd", }, |
ecd76ede | 28 | { .compatible = "isa", }, |
cbb49c26 GL |
29 | #ifdef CONFIG_ARM_AMBA |
30 | { .compatible = "arm,amba-bus", }, | |
31 | #endif /* CONFIG_ARM_AMBA */ | |
32 | {} /* Empty terminated list */ | |
33 | }; | |
34 | ||
c6085584 JB |
35 | static int of_dev_node_match(struct device *dev, void *data) |
36 | { | |
37 | return dev->of_node == data; | |
38 | } | |
39 | ||
40 | /** | |
41 | * of_find_device_by_node - Find the platform_device associated with a node | |
42 | * @np: Pointer to device tree node | |
43 | * | |
4fb373df JH |
44 | * Takes a reference to the embedded struct device which needs to be dropped |
45 | * after use. | |
46 | * | |
c6085584 JB |
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 | */ |
e553f539 | 75 | static 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", | |
95e6b1fa | 97 | kbasename(node->full_name), dev_name(dev)); |
07e461cd GL |
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 | ||
6d7e3bf8 | 116 | dev = platform_device_alloc("", PLATFORM_DEVID_NONE); |
7096d042 GL |
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); | |
f94277af | 145 | dev->dev.fwnode = &np->fwnode; |
43c0767e | 146 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
147 | |
148 | if (bus_id) | |
149 | dev_set_name(&dev->dev, "%s", bus_id); | |
150 | else | |
151 | of_device_make_bus_id(&dev->dev); | |
152 | ||
153 | return dev; | |
154 | } | |
155 | EXPORT_SYMBOL(of_device_alloc); | |
156 | ||
5fd200f3 | 157 | /** |
15c3597d | 158 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
159 | * @np: pointer to node to create device for |
160 | * @bus_id: name to assign device | |
15c3597d | 161 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 162 | * @parent: Linux device model parent device. |
cd1e6504 GL |
163 | * |
164 | * Returns pointer to created platform device, or NULL if a device was not | |
165 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 166 | */ |
245d9641 | 167 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
168 | struct device_node *np, |
169 | const char *bus_id, | |
170 | void *platform_data, | |
171 | struct device *parent) | |
5fd200f3 | 172 | { |
94a0cb1f | 173 | struct platform_device *dev; |
5fd200f3 | 174 | |
c6e126de PM |
175 | if (!of_device_is_available(np) || |
176 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
177 | return NULL; |
178 | ||
5fd200f3 GL |
179 | dev = of_device_alloc(np, bus_id, parent); |
180 | if (!dev) | |
c6e126de | 181 | goto err_clear_flag; |
5fd200f3 | 182 | |
eca39301 | 183 | dev->dev.bus = &platform_bus_type; |
15c3597d | 184 | dev->dev.platform_data = platform_data; |
c706c239 | 185 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 186 | |
7096d042 GL |
187 | if (of_device_add(dev) != 0) { |
188 | platform_device_put(dev); | |
c6e126de | 189 | goto err_clear_flag; |
5fd200f3 GL |
190 | } |
191 | ||
192 | return dev; | |
c6e126de PM |
193 | |
194 | err_clear_flag: | |
195 | of_node_clear_flag(np, OF_POPULATED); | |
196 | return NULL; | |
5fd200f3 | 197 | } |
15c3597d GL |
198 | |
199 | /** | |
200 | * of_platform_device_create - Alloc, initialize and register an of_device | |
201 | * @np: pointer to node to create device for | |
202 | * @bus_id: name to assign device | |
203 | * @parent: Linux device model parent device. | |
204 | * | |
205 | * Returns pointer to created platform device, or NULL if a device was not | |
206 | * registered. Unavailable devices will not get registered. | |
207 | */ | |
208 | struct platform_device *of_platform_device_create(struct device_node *np, | |
209 | const char *bus_id, | |
210 | struct device *parent) | |
211 | { | |
212 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
213 | } | |
5fd200f3 GL |
214 | EXPORT_SYMBOL(of_platform_device_create); |
215 | ||
5de1540b GL |
216 | #ifdef CONFIG_ARM_AMBA |
217 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
218 | const char *bus_id, | |
219 | void *platform_data, | |
220 | struct device *parent) | |
221 | { | |
222 | struct amba_device *dev; | |
223 | const void *prop; | |
224 | int i, ret; | |
225 | ||
0d638a07 | 226 | pr_debug("Creating amba device %pOF\n", node); |
5de1540b | 227 | |
c6e126de PM |
228 | if (!of_device_is_available(node) || |
229 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
230 | return NULL; |
231 | ||
c0f72f8a | 232 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 233 | if (!dev) |
c6e126de | 234 | goto err_clear_flag; |
5de1540b GL |
235 | |
236 | /* setup generic device info */ | |
5de1540b | 237 | dev->dev.of_node = of_node_get(node); |
f94277af | 238 | dev->dev.fwnode = &node->fwnode; |
43c0767e | 239 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
240 | dev->dev.platform_data = platform_data; |
241 | if (bus_id) | |
242 | dev_set_name(&dev->dev, "%s", bus_id); | |
243 | else | |
244 | of_device_make_bus_id(&dev->dev); | |
245 | ||
5de1540b GL |
246 | /* Allow the HW Peripheral ID to be overridden */ |
247 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
248 | if (prop) | |
249 | dev->periphid = of_read_ulong(prop, 1); | |
250 | ||
251 | /* Decode the IRQs and address ranges */ | |
252 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
253 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
254 | ||
255 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df | 256 | if (ret) { |
0d638a07 RH |
257 | pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", |
258 | ret, node); | |
5de1540b | 259 | goto err_free; |
2bc552df | 260 | } |
5de1540b | 261 | |
c0f72f8a | 262 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 263 | if (ret) { |
0d638a07 RH |
264 | pr_err("amba_device_add() failed (%d) for %pOF\n", |
265 | ret, node); | |
5de1540b | 266 | goto err_free; |
2bc552df | 267 | } |
5de1540b GL |
268 | |
269 | return dev; | |
270 | ||
271 | err_free: | |
c0f72f8a | 272 | amba_device_put(dev); |
c6e126de PM |
273 | err_clear_flag: |
274 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
275 | return NULL; |
276 | } | |
277 | #else /* CONFIG_ARM_AMBA */ | |
278 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
279 | const char *bus_id, | |
280 | void *platform_data, | |
281 | struct device *parent) | |
282 | { | |
283 | return NULL; | |
284 | } | |
285 | #endif /* CONFIG_ARM_AMBA */ | |
286 | ||
15c3597d GL |
287 | /** |
288 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
289 | */ | |
290 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
291 | struct device_node *np) | |
292 | { | |
fc5cf80a | 293 | const struct of_dev_auxdata *auxdata; |
15c3597d | 294 | struct resource res; |
fc5cf80a | 295 | int compatible = 0; |
303f59d1 OJ |
296 | |
297 | if (!lookup) | |
298 | return NULL; | |
299 | ||
fc5cf80a TL |
300 | auxdata = lookup; |
301 | for (; auxdata->compatible; auxdata++) { | |
302 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 303 | continue; |
fc5cf80a | 304 | compatible++; |
84774e61 | 305 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 306 | if (res.start != auxdata->phys_addr) |
84774e61 | 307 | continue; |
0d638a07 | 308 | pr_debug("%pOF: devname=%s\n", np, auxdata->name); |
fc5cf80a TL |
309 | return auxdata; |
310 | } | |
311 | ||
312 | if (!compatible) | |
313 | return NULL; | |
314 | ||
315 | /* Try compatible match if no phys_addr and name are specified */ | |
316 | auxdata = lookup; | |
317 | for (; auxdata->compatible; auxdata++) { | |
318 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
319 | continue; | |
320 | if (!auxdata->phys_addr && !auxdata->name) { | |
0d638a07 | 321 | pr_debug("%pOF: compatible match\n", np); |
fc5cf80a TL |
322 | return auxdata; |
323 | } | |
15c3597d | 324 | } |
303f59d1 | 325 | |
15c3597d GL |
326 | return NULL; |
327 | } | |
328 | ||
5fd200f3 | 329 | /** |
38e9e21d | 330 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 331 | * @bus: device node of the bus to instantiate |
1eed4c07 | 332 | * @matches: match table for bus nodes |
303f59d1 | 333 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 334 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 335 | * @strict: require compatible property |
38e9e21d GL |
336 | * |
337 | * Creates a platform_device for the provided device_node, and optionally | |
338 | * recursively create devices for all the child nodes. | |
5fd200f3 | 339 | */ |
38e9e21d | 340 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 341 | const struct of_device_id *matches, |
15c3597d | 342 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 343 | struct device *parent, bool strict) |
5fd200f3 | 344 | { |
15c3597d | 345 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 346 | struct device_node *child; |
94a0cb1f | 347 | struct platform_device *dev; |
15c3597d GL |
348 | const char *bus_id = NULL; |
349 | void *platform_data = NULL; | |
5fd200f3 GL |
350 | int rc = 0; |
351 | ||
29d4f8a4 GL |
352 | /* Make sure it has a compatible property */ |
353 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
0d638a07 RH |
354 | pr_debug("%s() - skipping %pOF, no compatible prop\n", |
355 | __func__, bus); | |
29d4f8a4 GL |
356 | return 0; |
357 | } | |
358 | ||
44a7185c | 359 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
0d638a07 RH |
360 | pr_debug("%s() - skipping %pOF, already populated\n", |
361 | __func__, bus); | |
44a7185c KW |
362 | return 0; |
363 | } | |
364 | ||
15c3597d GL |
365 | auxdata = of_dev_lookup(lookup, bus); |
366 | if (auxdata) { | |
367 | bus_id = auxdata->name; | |
368 | platform_data = auxdata->platform_data; | |
369 | } | |
370 | ||
5de1540b | 371 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
372 | /* |
373 | * Don't return an error here to keep compatibility with older | |
374 | * device tree files. | |
375 | */ | |
15c3597d | 376 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
377 | return 0; |
378 | } | |
379 | ||
15c3597d | 380 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
381 | if (!dev || !of_match_node(matches, bus)) |
382 | return 0; | |
383 | ||
5fd200f3 | 384 | for_each_child_of_node(bus, child) { |
0d638a07 | 385 | pr_debug(" create child: %pOF\n", child); |
15c3597d | 386 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
387 | if (rc) { |
388 | of_node_put(child); | |
389 | break; | |
390 | } | |
391 | } | |
75f353b6 | 392 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
393 | return rc; |
394 | } | |
395 | ||
396 | /** | |
38e9e21d | 397 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 398 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 399 | * @matches: match table for bus nodes |
5fd200f3 GL |
400 | * @parent: parent to hook devices from, NULL for toplevel |
401 | * | |
402 | * Note that children of the provided root are not instantiated as devices | |
403 | * unless the specified root itself matches the bus list and is not NULL. | |
404 | */ | |
405 | int of_platform_bus_probe(struct device_node *root, | |
406 | const struct of_device_id *matches, | |
407 | struct device *parent) | |
408 | { | |
409 | struct device_node *child; | |
5fd200f3 GL |
410 | int rc = 0; |
411 | ||
1eed4c07 GL |
412 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
413 | if (!root) | |
60d59913 | 414 | return -EINVAL; |
5fd200f3 | 415 | |
44a7185c | 416 | pr_debug("%s()\n", __func__); |
0d638a07 | 417 | pr_debug(" starting at: %pOF\n", root); |
5fd200f3 | 418 | |
1eed4c07 | 419 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 420 | if (of_match_node(matches, root)) { |
15c3597d | 421 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 422 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
423 | if (!of_match_node(matches, child)) |
424 | continue; | |
15c3597d | 425 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
426 | if (rc) { |
427 | of_node_put(child); | |
5fd200f3 | 428 | break; |
7fad948a | 429 | } |
5fd200f3 | 430 | } |
38e9e21d | 431 | |
5fd200f3 GL |
432 | of_node_put(root); |
433 | return rc; | |
434 | } | |
435 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
436 | |
437 | /** | |
438 | * of_platform_populate() - Populate platform_devices from device tree data | |
439 | * @root: parent of the first level to probe or NULL for the root of the tree | |
440 | * @matches: match table, NULL to use the default | |
92039ed1 | 441 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
442 | * @parent: parent to hook devices from, NULL for toplevel |
443 | * | |
444 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
445 | * and creates devices from nodes. It differs in that it follows the modern | |
446 | * convention of requiring all device nodes to have a 'compatible' property, | |
447 | * and it is suitable for creating devices which are children of the root | |
448 | * node (of_platform_bus_probe will only create children of the root which | |
449 | * are selected by the @matches argument). | |
450 | * | |
451 | * New board support should be using this function instead of | |
452 | * of_platform_bus_probe(). | |
453 | * | |
454 | * Returns 0 on success, < 0 on failure. | |
455 | */ | |
456 | int of_platform_populate(struct device_node *root, | |
457 | const struct of_device_id *matches, | |
15c3597d | 458 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
459 | struct device *parent) |
460 | { | |
461 | struct device_node *child; | |
462 | int rc = 0; | |
463 | ||
464 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
465 | if (!root) | |
466 | return -EINVAL; | |
467 | ||
44a7185c | 468 | pr_debug("%s()\n", __func__); |
0d638a07 | 469 | pr_debug(" starting at: %pOF\n", root); |
44a7185c | 470 | |
29d4f8a4 | 471 | for_each_child_of_node(root, child) { |
15c3597d | 472 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
473 | if (rc) { |
474 | of_node_put(child); | |
29d4f8a4 | 475 | break; |
7fad948a | 476 | } |
29d4f8a4 | 477 | } |
2d0747c4 | 478 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
479 | |
480 | of_node_put(root); | |
481 | return rc; | |
482 | } | |
e001f1c8 | 483 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 484 | |
43443ad6 HM |
485 | int of_platform_default_populate(struct device_node *root, |
486 | const struct of_dev_auxdata *lookup, | |
487 | struct device *parent) | |
488 | { | |
489 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
490 | parent); | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
493 | ||
fc520f8b | 494 | #ifndef CONFIG_PPC |
a50ff19d | 495 | static const struct of_device_id reserved_mem_matches[] = { |
d1de6d6c | 496 | { .compatible = "qcom,rmtfs-mem" }, |
a50ff19d BA |
497 | { .compatible = "ramoops" }, |
498 | {} | |
499 | }; | |
500 | ||
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 | /* | |
a50ff19d BA |
509 | * Handle certain compatibles explicitly, since we don't want to create |
510 | * platform_devices for every node in /reserved-memory with a | |
511 | * "compatible", | |
529182e2 | 512 | */ |
a50ff19d BA |
513 | for_each_matching_node(node, reserved_mem_matches) |
514 | of_platform_device_create(node, NULL, NULL); | |
529182e2 | 515 | |
3aa0582f | 516 | node = of_find_node_by_path("/firmware"); |
e2105ca8 | 517 | if (node) { |
3aa0582f | 518 | of_platform_populate(node, NULL, NULL, NULL); |
e2105ca8 SH |
519 | of_node_put(node); |
520 | } | |
3aa0582f | 521 | |
529182e2 KC |
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 | |
c2372c20 | 530 | int of_platform_device_destroy(struct device *dev, void *data) |
c6e126de | 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 PM |
546 | |
547 | of_node_clear_flag(dev->of_node, OF_POPULATED); | |
75f353b6 | 548 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
c6e126de PM |
549 | return 0; |
550 | } | |
c2372c20 | 551 | EXPORT_SYMBOL_GPL(of_platform_device_destroy); |
c6e126de PM |
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). | |
c6e126de | 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 | ||
38b0b219 BG |
571 | static void devm_of_platform_populate_release(struct device *dev, void *res) |
572 | { | |
573 | of_platform_depopulate(*(struct device **)res); | |
574 | } | |
575 | ||
576 | /** | |
577 | * devm_of_platform_populate() - Populate platform_devices from device tree data | |
578 | * @dev: device that requested to populate from device tree data | |
579 | * | |
580 | * Similar to of_platform_populate(), but will automatically call | |
581 | * of_platform_depopulate() when the device is unbound from the bus. | |
582 | * | |
583 | * Returns 0 on success, < 0 on failure. | |
584 | */ | |
585 | int devm_of_platform_populate(struct device *dev) | |
586 | { | |
587 | struct device **ptr; | |
588 | int ret; | |
589 | ||
590 | if (!dev) | |
591 | return -EINVAL; | |
592 | ||
593 | ptr = devres_alloc(devm_of_platform_populate_release, | |
594 | sizeof(*ptr), GFP_KERNEL); | |
595 | if (!ptr) | |
596 | return -ENOMEM; | |
597 | ||
598 | ret = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
599 | if (ret) { | |
600 | devres_free(ptr); | |
601 | } else { | |
602 | *ptr = dev; | |
603 | devres_add(dev, ptr); | |
604 | } | |
605 | ||
606 | return ret; | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(devm_of_platform_populate); | |
609 | ||
610 | static int devm_of_platform_match(struct device *dev, void *res, void *data) | |
611 | { | |
612 | struct device **ptr = res; | |
613 | ||
614 | if (!ptr) { | |
615 | WARN_ON(!ptr); | |
616 | return 0; | |
617 | } | |
618 | ||
619 | return *ptr == data; | |
620 | } | |
621 | ||
622 | /** | |
623 | * devm_of_platform_depopulate() - Remove devices populated from device tree | |
624 | * @dev: device that requested to depopulate from device tree data | |
625 | * | |
626 | * Complementary to devm_of_platform_populate(), this function removes children | |
627 | * of the given device (and, recurrently, their children) that have been | |
628 | * created from their respective device tree nodes (and only those, | |
629 | * leaving others - eg. manually created - unharmed). | |
630 | */ | |
631 | void devm_of_platform_depopulate(struct device *dev) | |
632 | { | |
633 | int ret; | |
634 | ||
635 | ret = devres_release(dev, devm_of_platform_populate_release, | |
636 | devm_of_platform_match, dev); | |
637 | ||
638 | WARN_ON(ret); | |
639 | } | |
640 | EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); | |
641 | ||
801d728c PA |
642 | #ifdef CONFIG_OF_DYNAMIC |
643 | static int of_platform_notify(struct notifier_block *nb, | |
644 | unsigned long action, void *arg) | |
645 | { | |
646 | struct of_reconfig_data *rd = arg; | |
647 | struct platform_device *pdev_parent, *pdev; | |
648 | bool children_left; | |
649 | ||
650 | switch (of_reconfig_get_state_change(action, rd)) { | |
651 | case OF_RECONFIG_CHANGE_ADD: | |
652 | /* verify that the parent is a bus */ | |
653 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
654 | return NOTIFY_OK; /* not for us */ | |
655 | ||
15204ab1 PA |
656 | /* already populated? (driver using of_populate manually) */ |
657 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
658 | return NOTIFY_OK; | |
659 | ||
801d728c PA |
660 | /* pdev_parent may be NULL when no bus platform device */ |
661 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
662 | pdev = of_platform_device_create(rd->dn, NULL, | |
663 | pdev_parent ? &pdev_parent->dev : NULL); | |
664 | of_dev_put(pdev_parent); | |
665 | ||
666 | if (pdev == NULL) { | |
0d638a07 RH |
667 | pr_err("%s: failed to create for '%pOF'\n", |
668 | __func__, rd->dn); | |
801d728c PA |
669 | /* of_platform_device_create tosses the error code */ |
670 | return notifier_from_errno(-EINVAL); | |
671 | } | |
672 | break; | |
673 | ||
674 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
675 | |
676 | /* already depopulated? */ | |
677 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
678 | return NOTIFY_OK; | |
679 | ||
801d728c PA |
680 | /* find our device by node */ |
681 | pdev = of_find_device_by_node(rd->dn); | |
682 | if (pdev == NULL) | |
683 | return NOTIFY_OK; /* no? not meant for us */ | |
684 | ||
685 | /* unregister takes one ref away */ | |
686 | of_platform_device_destroy(&pdev->dev, &children_left); | |
687 | ||
688 | /* and put the reference of the find */ | |
689 | of_dev_put(pdev); | |
690 | break; | |
691 | } | |
692 | ||
693 | return NOTIFY_OK; | |
694 | } | |
695 | ||
696 | static struct notifier_block platform_of_notifier = { | |
697 | .notifier_call = of_platform_notify, | |
698 | }; | |
699 | ||
700 | void of_platform_register_reconfig_notifier(void) | |
701 | { | |
702 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
703 | } | |
704 | #endif /* CONFIG_OF_DYNAMIC */ | |
705 | ||
964dba28 | 706 | #endif /* CONFIG_OF_ADDRESS */ |