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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 | ||
4550fe63 VK |
35 | static const struct of_device_id of_skipped_node_table[] = { |
36 | { .compatible = "operating-points-v2", }, | |
37 | {} /* Empty terminated list */ | |
38 | }; | |
39 | ||
418e3ea1 | 40 | static int of_dev_node_match(struct device *dev, const void *data) |
c6085584 JB |
41 | { |
42 | return dev->of_node == data; | |
43 | } | |
44 | ||
45 | /** | |
46 | * of_find_device_by_node - Find the platform_device associated with a node | |
47 | * @np: Pointer to device tree node | |
48 | * | |
4fb373df JH |
49 | * Takes a reference to the embedded struct device which needs to be dropped |
50 | * after use. | |
51 | * | |
c6085584 JB |
52 | * Returns platform_device pointer, or NULL if not found |
53 | */ | |
54 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
55 | { | |
56 | struct device *dev; | |
57 | ||
58 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
59 | return dev ? to_platform_device(dev) : NULL; | |
60 | } | |
61 | EXPORT_SYMBOL(of_find_device_by_node); | |
62 | ||
964dba28 | 63 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
64 | /* |
65 | * The following routines scan a subtree and registers a device for | |
66 | * each applicable node. | |
67 | * | |
68 | * Note: sparc doesn't use these routines because it has a different | |
69 | * mechanism for creating devices from device tree nodes. | |
70 | */ | |
71 | ||
94c09319 GL |
72 | /** |
73 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
74 | * @dev: pointer to device structure that is linked to a device tree node | |
75 | * | |
07e461cd GL |
76 | * This routine will first try using the translated bus address to |
77 | * derive a unique name. If it cannot, then it will prepend names from | |
78 | * parent nodes until a unique name can be derived. | |
94c09319 | 79 | */ |
e553f539 | 80 | static void of_device_make_bus_id(struct device *dev) |
94c09319 | 81 | { |
94c09319 | 82 | struct device_node *node = dev->of_node; |
24fb530f | 83 | const __be32 *reg; |
94c09319 | 84 | u64 addr; |
94c09319 | 85 | |
07e461cd GL |
86 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
87 | while (node->parent) { | |
88 | /* | |
89 | * If the address can be translated, then that is as much | |
90 | * uniqueness as we need. Make it the first component and return | |
91 | */ | |
92 | reg = of_get_property(node, "reg", NULL); | |
93 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { | |
a613b26a | 94 | dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", |
d88590dc | 95 | addr, node, 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", | |
95e6b1fa | 101 | kbasename(node->full_name), dev_name(dev)); |
07e461cd GL |
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 | ||
6d7e3bf8 | 120 | dev = platform_device_alloc("", PLATFORM_DEVID_NONE); |
7096d042 GL |
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) { | |
6396bb22 | 131 | res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL); |
7096d042 GL |
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 | 143 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
a613b26a RH |
144 | pr_debug("not all legacy IRQ resources mapped for %pOFn\n", |
145 | np); | |
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 | ||
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 | |
a5516219 RM |
187 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
188 | if (!dev->dev.dma_mask) | |
189 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
eca39301 | 190 | dev->dev.bus = &platform_bus_type; |
15c3597d | 191 | dev->dev.platform_data = platform_data; |
c706c239 | 192 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 193 | |
7096d042 GL |
194 | if (of_device_add(dev) != 0) { |
195 | platform_device_put(dev); | |
c6e126de | 196 | goto err_clear_flag; |
5fd200f3 GL |
197 | } |
198 | ||
199 | return dev; | |
c6e126de PM |
200 | |
201 | err_clear_flag: | |
202 | of_node_clear_flag(np, OF_POPULATED); | |
203 | return NULL; | |
5fd200f3 | 204 | } |
15c3597d GL |
205 | |
206 | /** | |
207 | * of_platform_device_create - Alloc, initialize and register an of_device | |
208 | * @np: pointer to node to create device for | |
209 | * @bus_id: name to assign device | |
210 | * @parent: Linux device model parent device. | |
211 | * | |
212 | * Returns pointer to created platform device, or NULL if a device was not | |
213 | * registered. Unavailable devices will not get registered. | |
214 | */ | |
215 | struct platform_device *of_platform_device_create(struct device_node *np, | |
216 | const char *bus_id, | |
217 | struct device *parent) | |
218 | { | |
219 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
220 | } | |
5fd200f3 GL |
221 | EXPORT_SYMBOL(of_platform_device_create); |
222 | ||
5de1540b GL |
223 | #ifdef CONFIG_ARM_AMBA |
224 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
225 | const char *bus_id, | |
226 | void *platform_data, | |
227 | struct device *parent) | |
228 | { | |
229 | struct amba_device *dev; | |
230 | const void *prop; | |
231 | int i, ret; | |
232 | ||
0d638a07 | 233 | pr_debug("Creating amba device %pOF\n", node); |
5de1540b | 234 | |
c6e126de PM |
235 | if (!of_device_is_available(node) || |
236 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
237 | return NULL; |
238 | ||
c0f72f8a | 239 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 240 | if (!dev) |
c6e126de | 241 | goto err_clear_flag; |
5de1540b | 242 | |
8c89ef7b LW |
243 | /* AMBA devices only support a single DMA mask */ |
244 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
245 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
246 | ||
5de1540b | 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); | |
256 | ||
5de1540b GL |
257 | /* Allow the HW Peripheral ID to be overridden */ |
258 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
259 | if (prop) | |
260 | dev->periphid = of_read_ulong(prop, 1); | |
261 | ||
262 | /* Decode the IRQs and address ranges */ | |
263 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
264 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
265 | ||
266 | ret = of_address_to_resource(node, 0, &dev->res); | |
2bc552df | 267 | if (ret) { |
0d638a07 RH |
268 | pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", |
269 | ret, node); | |
5de1540b | 270 | goto err_free; |
2bc552df | 271 | } |
5de1540b | 272 | |
c0f72f8a | 273 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 274 | if (ret) { |
0d638a07 RH |
275 | pr_err("amba_device_add() failed (%d) for %pOF\n", |
276 | ret, node); | |
5de1540b | 277 | goto err_free; |
2bc552df | 278 | } |
5de1540b GL |
279 | |
280 | return dev; | |
281 | ||
282 | err_free: | |
c0f72f8a | 283 | amba_device_put(dev); |
c6e126de PM |
284 | err_clear_flag: |
285 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
286 | return NULL; |
287 | } | |
288 | #else /* CONFIG_ARM_AMBA */ | |
289 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
290 | const char *bus_id, | |
291 | void *platform_data, | |
292 | struct device *parent) | |
293 | { | |
294 | return NULL; | |
295 | } | |
296 | #endif /* CONFIG_ARM_AMBA */ | |
297 | ||
15c3597d GL |
298 | /** |
299 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
300 | */ | |
301 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
302 | struct device_node *np) | |
303 | { | |
fc5cf80a | 304 | const struct of_dev_auxdata *auxdata; |
15c3597d | 305 | struct resource res; |
fc5cf80a | 306 | int compatible = 0; |
303f59d1 OJ |
307 | |
308 | if (!lookup) | |
309 | return NULL; | |
310 | ||
fc5cf80a TL |
311 | auxdata = lookup; |
312 | for (; auxdata->compatible; auxdata++) { | |
313 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 314 | continue; |
fc5cf80a | 315 | compatible++; |
84774e61 | 316 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 317 | if (res.start != auxdata->phys_addr) |
84774e61 | 318 | continue; |
0d638a07 | 319 | pr_debug("%pOF: devname=%s\n", np, auxdata->name); |
fc5cf80a TL |
320 | return auxdata; |
321 | } | |
322 | ||
323 | if (!compatible) | |
324 | return NULL; | |
325 | ||
326 | /* Try compatible match if no phys_addr and name are specified */ | |
327 | auxdata = lookup; | |
328 | for (; auxdata->compatible; auxdata++) { | |
329 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
330 | continue; | |
331 | if (!auxdata->phys_addr && !auxdata->name) { | |
0d638a07 | 332 | pr_debug("%pOF: compatible match\n", np); |
fc5cf80a TL |
333 | return auxdata; |
334 | } | |
15c3597d | 335 | } |
303f59d1 | 336 | |
15c3597d GL |
337 | return NULL; |
338 | } | |
339 | ||
5fd200f3 | 340 | /** |
38e9e21d | 341 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 342 | * @bus: device node of the bus to instantiate |
1eed4c07 | 343 | * @matches: match table for bus nodes |
303f59d1 | 344 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 345 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 346 | * @strict: require compatible property |
38e9e21d GL |
347 | * |
348 | * Creates a platform_device for the provided device_node, and optionally | |
349 | * recursively create devices for all the child nodes. | |
5fd200f3 | 350 | */ |
38e9e21d | 351 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 352 | const struct of_device_id *matches, |
15c3597d | 353 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 354 | struct device *parent, bool strict) |
5fd200f3 | 355 | { |
15c3597d | 356 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 357 | struct device_node *child; |
94a0cb1f | 358 | struct platform_device *dev; |
15c3597d GL |
359 | const char *bus_id = NULL; |
360 | void *platform_data = NULL; | |
5fd200f3 GL |
361 | int rc = 0; |
362 | ||
29d4f8a4 GL |
363 | /* Make sure it has a compatible property */ |
364 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
0d638a07 RH |
365 | pr_debug("%s() - skipping %pOF, no compatible prop\n", |
366 | __func__, bus); | |
29d4f8a4 GL |
367 | return 0; |
368 | } | |
369 | ||
4550fe63 VK |
370 | /* Skip nodes for which we don't want to create devices */ |
371 | if (unlikely(of_match_node(of_skipped_node_table, bus))) { | |
372 | pr_debug("%s() - skipping %pOF node\n", __func__, bus); | |
373 | return 0; | |
374 | } | |
375 | ||
44a7185c | 376 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
0d638a07 RH |
377 | pr_debug("%s() - skipping %pOF, already populated\n", |
378 | __func__, bus); | |
44a7185c KW |
379 | return 0; |
380 | } | |
381 | ||
15c3597d GL |
382 | auxdata = of_dev_lookup(lookup, bus); |
383 | if (auxdata) { | |
384 | bus_id = auxdata->name; | |
385 | platform_data = auxdata->platform_data; | |
386 | } | |
387 | ||
5de1540b | 388 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
389 | /* |
390 | * Don't return an error here to keep compatibility with older | |
391 | * device tree files. | |
392 | */ | |
15c3597d | 393 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
394 | return 0; |
395 | } | |
396 | ||
15c3597d | 397 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
398 | if (!dev || !of_match_node(matches, bus)) |
399 | return 0; | |
400 | ||
5fd200f3 | 401 | for_each_child_of_node(bus, child) { |
0d638a07 | 402 | pr_debug(" create child: %pOF\n", child); |
15c3597d | 403 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
404 | if (rc) { |
405 | of_node_put(child); | |
406 | break; | |
407 | } | |
408 | } | |
75f353b6 | 409 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
410 | return rc; |
411 | } | |
412 | ||
413 | /** | |
38e9e21d | 414 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 415 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 416 | * @matches: match table for bus nodes |
5fd200f3 GL |
417 | * @parent: parent to hook devices from, NULL for toplevel |
418 | * | |
419 | * Note that children of the provided root are not instantiated as devices | |
420 | * unless the specified root itself matches the bus list and is not NULL. | |
421 | */ | |
422 | int of_platform_bus_probe(struct device_node *root, | |
423 | const struct of_device_id *matches, | |
424 | struct device *parent) | |
425 | { | |
426 | struct device_node *child; | |
5fd200f3 GL |
427 | int rc = 0; |
428 | ||
1eed4c07 GL |
429 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
430 | if (!root) | |
60d59913 | 431 | return -EINVAL; |
5fd200f3 | 432 | |
44a7185c | 433 | pr_debug("%s()\n", __func__); |
0d638a07 | 434 | pr_debug(" starting at: %pOF\n", root); |
5fd200f3 | 435 | |
1eed4c07 | 436 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 437 | if (of_match_node(matches, root)) { |
15c3597d | 438 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 439 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
440 | if (!of_match_node(matches, child)) |
441 | continue; | |
15c3597d | 442 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
443 | if (rc) { |
444 | of_node_put(child); | |
5fd200f3 | 445 | break; |
7fad948a | 446 | } |
5fd200f3 | 447 | } |
38e9e21d | 448 | |
5fd200f3 GL |
449 | of_node_put(root); |
450 | return rc; | |
451 | } | |
452 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
453 | |
454 | /** | |
455 | * of_platform_populate() - Populate platform_devices from device tree data | |
456 | * @root: parent of the first level to probe or NULL for the root of the tree | |
457 | * @matches: match table, NULL to use the default | |
92039ed1 | 458 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
459 | * @parent: parent to hook devices from, NULL for toplevel |
460 | * | |
461 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
462 | * and creates devices from nodes. It differs in that it follows the modern | |
463 | * convention of requiring all device nodes to have a 'compatible' property, | |
464 | * and it is suitable for creating devices which are children of the root | |
465 | * node (of_platform_bus_probe will only create children of the root which | |
466 | * are selected by the @matches argument). | |
467 | * | |
468 | * New board support should be using this function instead of | |
469 | * of_platform_bus_probe(). | |
470 | * | |
471 | * Returns 0 on success, < 0 on failure. | |
472 | */ | |
473 | int of_platform_populate(struct device_node *root, | |
474 | const struct of_device_id *matches, | |
15c3597d | 475 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
476 | struct device *parent) |
477 | { | |
478 | struct device_node *child; | |
479 | int rc = 0; | |
480 | ||
481 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
482 | if (!root) | |
483 | return -EINVAL; | |
484 | ||
44a7185c | 485 | pr_debug("%s()\n", __func__); |
0d638a07 | 486 | pr_debug(" starting at: %pOF\n", root); |
44a7185c | 487 | |
29d4f8a4 | 488 | for_each_child_of_node(root, child) { |
15c3597d | 489 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
490 | if (rc) { |
491 | of_node_put(child); | |
29d4f8a4 | 492 | break; |
7fad948a | 493 | } |
29d4f8a4 | 494 | } |
2d0747c4 | 495 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
496 | |
497 | of_node_put(root); | |
498 | return rc; | |
499 | } | |
e001f1c8 | 500 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 501 | |
43443ad6 HM |
502 | int of_platform_default_populate(struct device_node *root, |
503 | const struct of_dev_auxdata *lookup, | |
504 | struct device *parent) | |
505 | { | |
506 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
507 | parent); | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
510 | ||
fc520f8b | 511 | #ifndef CONFIG_PPC |
a50ff19d | 512 | static const struct of_device_id reserved_mem_matches[] = { |
d1de6d6c | 513 | { .compatible = "qcom,rmtfs-mem" }, |
312416d9 | 514 | { .compatible = "qcom,cmd-db" }, |
a50ff19d BA |
515 | { .compatible = "ramoops" }, |
516 | {} | |
517 | }; | |
518 | ||
44a7185c KW |
519 | static int __init of_platform_default_populate_init(void) |
520 | { | |
529182e2 KC |
521 | struct device_node *node; |
522 | ||
523 | if (!of_have_populated_dt()) | |
524 | return -ENODEV; | |
525 | ||
526 | /* | |
a50ff19d BA |
527 | * Handle certain compatibles explicitly, since we don't want to create |
528 | * platform_devices for every node in /reserved-memory with a | |
529 | * "compatible", | |
529182e2 | 530 | */ |
a50ff19d BA |
531 | for_each_matching_node(node, reserved_mem_matches) |
532 | of_platform_device_create(node, NULL, NULL); | |
529182e2 | 533 | |
3aa0582f | 534 | node = of_find_node_by_path("/firmware"); |
e2105ca8 | 535 | if (node) { |
3aa0582f | 536 | of_platform_populate(node, NULL, NULL, NULL); |
e2105ca8 SH |
537 | of_node_put(node); |
538 | } | |
3aa0582f | 539 | |
529182e2 KC |
540 | /* Populate everything else. */ |
541 | of_platform_default_populate(NULL, NULL, NULL); | |
44a7185c KW |
542 | |
543 | return 0; | |
544 | } | |
545 | arch_initcall_sync(of_platform_default_populate_init); | |
fc520f8b | 546 | #endif |
44a7185c | 547 | |
c2372c20 | 548 | int of_platform_device_destroy(struct device *dev, void *data) |
c6e126de | 549 | { |
c6e126de | 550 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 551 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 552 | return 0; |
c6e126de | 553 | |
75f353b6 GL |
554 | /* Recurse for any nodes that were treated as busses */ |
555 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
556 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de | 557 | |
522811e9 SK |
558 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
559 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); | |
560 | ||
c6e126de PM |
561 | if (dev->bus == &platform_bus_type) |
562 | platform_device_unregister(to_platform_device(dev)); | |
563 | #ifdef CONFIG_ARM_AMBA | |
564 | else if (dev->bus == &amba_bustype) | |
565 | amba_device_unregister(to_amba_device(dev)); | |
566 | #endif | |
c6e126de | 567 | |
c6e126de PM |
568 | return 0; |
569 | } | |
c2372c20 | 570 | EXPORT_SYMBOL_GPL(of_platform_device_destroy); |
c6e126de PM |
571 | |
572 | /** | |
573 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 574 | * @parent: device which children will be removed |
c6e126de PM |
575 | * |
576 | * Complementary to of_platform_populate(), this function removes children | |
577 | * of the given device (and, recurrently, their children) that have been | |
578 | * created from their respective device tree nodes (and only those, | |
579 | * leaving others - eg. manually created - unharmed). | |
c6e126de | 580 | */ |
75f353b6 | 581 | void of_platform_depopulate(struct device *parent) |
c6e126de | 582 | { |
2d0747c4 GL |
583 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
584 | device_for_each_child(parent, NULL, of_platform_device_destroy); | |
585 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); | |
586 | } | |
c6e126de PM |
587 | } |
588 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
589 | ||
38b0b219 BG |
590 | static void devm_of_platform_populate_release(struct device *dev, void *res) |
591 | { | |
592 | of_platform_depopulate(*(struct device **)res); | |
593 | } | |
594 | ||
595 | /** | |
596 | * devm_of_platform_populate() - Populate platform_devices from device tree data | |
597 | * @dev: device that requested to populate from device tree data | |
598 | * | |
599 | * Similar to of_platform_populate(), but will automatically call | |
600 | * of_platform_depopulate() when the device is unbound from the bus. | |
601 | * | |
602 | * Returns 0 on success, < 0 on failure. | |
603 | */ | |
604 | int devm_of_platform_populate(struct device *dev) | |
605 | { | |
606 | struct device **ptr; | |
607 | int ret; | |
608 | ||
609 | if (!dev) | |
610 | return -EINVAL; | |
611 | ||
612 | ptr = devres_alloc(devm_of_platform_populate_release, | |
613 | sizeof(*ptr), GFP_KERNEL); | |
614 | if (!ptr) | |
615 | return -ENOMEM; | |
616 | ||
617 | ret = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
618 | if (ret) { | |
619 | devres_free(ptr); | |
620 | } else { | |
621 | *ptr = dev; | |
622 | devres_add(dev, ptr); | |
623 | } | |
624 | ||
625 | return ret; | |
626 | } | |
627 | EXPORT_SYMBOL_GPL(devm_of_platform_populate); | |
628 | ||
629 | static int devm_of_platform_match(struct device *dev, void *res, void *data) | |
630 | { | |
631 | struct device **ptr = res; | |
632 | ||
633 | if (!ptr) { | |
634 | WARN_ON(!ptr); | |
635 | return 0; | |
636 | } | |
637 | ||
638 | return *ptr == data; | |
639 | } | |
640 | ||
641 | /** | |
642 | * devm_of_platform_depopulate() - Remove devices populated from device tree | |
643 | * @dev: device that requested to depopulate from device tree data | |
644 | * | |
645 | * Complementary to devm_of_platform_populate(), this function removes children | |
646 | * of the given device (and, recurrently, their children) that have been | |
647 | * created from their respective device tree nodes (and only those, | |
648 | * leaving others - eg. manually created - unharmed). | |
649 | */ | |
650 | void devm_of_platform_depopulate(struct device *dev) | |
651 | { | |
652 | int ret; | |
653 | ||
654 | ret = devres_release(dev, devm_of_platform_populate_release, | |
655 | devm_of_platform_match, dev); | |
656 | ||
657 | WARN_ON(ret); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); | |
660 | ||
801d728c PA |
661 | #ifdef CONFIG_OF_DYNAMIC |
662 | static int of_platform_notify(struct notifier_block *nb, | |
663 | unsigned long action, void *arg) | |
664 | { | |
665 | struct of_reconfig_data *rd = arg; | |
666 | struct platform_device *pdev_parent, *pdev; | |
667 | bool children_left; | |
668 | ||
669 | switch (of_reconfig_get_state_change(action, rd)) { | |
670 | case OF_RECONFIG_CHANGE_ADD: | |
671 | /* verify that the parent is a bus */ | |
672 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
673 | return NOTIFY_OK; /* not for us */ | |
674 | ||
15204ab1 PA |
675 | /* already populated? (driver using of_populate manually) */ |
676 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
677 | return NOTIFY_OK; | |
678 | ||
801d728c PA |
679 | /* pdev_parent may be NULL when no bus platform device */ |
680 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
681 | pdev = of_platform_device_create(rd->dn, NULL, | |
682 | pdev_parent ? &pdev_parent->dev : NULL); | |
683 | of_dev_put(pdev_parent); | |
684 | ||
685 | if (pdev == NULL) { | |
0d638a07 RH |
686 | pr_err("%s: failed to create for '%pOF'\n", |
687 | __func__, rd->dn); | |
801d728c PA |
688 | /* of_platform_device_create tosses the error code */ |
689 | return notifier_from_errno(-EINVAL); | |
690 | } | |
691 | break; | |
692 | ||
693 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
694 | |
695 | /* already depopulated? */ | |
696 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
697 | return NOTIFY_OK; | |
698 | ||
801d728c PA |
699 | /* find our device by node */ |
700 | pdev = of_find_device_by_node(rd->dn); | |
701 | if (pdev == NULL) | |
702 | return NOTIFY_OK; /* no? not meant for us */ | |
703 | ||
704 | /* unregister takes one ref away */ | |
705 | of_platform_device_destroy(&pdev->dev, &children_left); | |
706 | ||
707 | /* and put the reference of the find */ | |
708 | of_dev_put(pdev); | |
709 | break; | |
710 | } | |
711 | ||
712 | return NOTIFY_OK; | |
713 | } | |
714 | ||
715 | static struct notifier_block platform_of_notifier = { | |
716 | .notifier_call = of_platform_notify, | |
717 | }; | |
718 | ||
719 | void of_platform_register_reconfig_notifier(void) | |
720 | { | |
721 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
722 | } | |
723 | #endif /* CONFIG_OF_DYNAMIC */ | |
724 | ||
964dba28 | 725 | #endif /* CONFIG_OF_ADDRESS */ |