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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 | ||
c6085584 JB |
40 | static int of_dev_node_match(struct device *dev, void *data) |
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 RH |
94 | dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", |
95 | (unsigned long long)addr, node, | |
07e461cd | 96 | dev_name(dev)); |
94c09319 GL |
97 | return; |
98 | } | |
94c09319 | 99 | |
07e461cd GL |
100 | /* format arguments only used if dev_name() resolves to NULL */ |
101 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", | |
95e6b1fa | 102 | kbasename(node->full_name), dev_name(dev)); |
07e461cd GL |
103 | node = node->parent; |
104 | } | |
94c09319 GL |
105 | } |
106 | ||
107 | /** | |
108 | * of_device_alloc - Allocate and initialize an of_device | |
109 | * @np: device node to assign to device | |
110 | * @bus_id: Name to assign to the device. May be null to use default name. | |
111 | * @parent: Parent device. | |
112 | */ | |
94a0cb1f | 113 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
114 | const char *bus_id, |
115 | struct device *parent) | |
116 | { | |
94a0cb1f | 117 | struct platform_device *dev; |
52f6537c | 118 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
119 | struct resource *res, temp_res; |
120 | ||
6d7e3bf8 | 121 | dev = platform_device_alloc("", PLATFORM_DEVID_NONE); |
7096d042 GL |
122 | if (!dev) |
123 | return NULL; | |
124 | ||
125 | /* count the io and irq resources */ | |
d9c6866b RH |
126 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
127 | num_reg++; | |
52f6537c | 128 | num_irq = of_irq_count(np); |
ac80a51e | 129 | |
ac80a51e GL |
130 | /* Populate the resource table */ |
131 | if (num_irq || num_reg) { | |
6396bb22 | 132 | res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL); |
7096d042 GL |
133 | if (!res) { |
134 | platform_device_put(dev); | |
135 | return NULL; | |
136 | } | |
137 | ||
ac80a51e GL |
138 | dev->num_resources = num_reg + num_irq; |
139 | dev->resource = res; | |
140 | for (i = 0; i < num_reg; i++, res++) { | |
141 | rc = of_address_to_resource(np, i, res); | |
142 | WARN_ON(rc); | |
143 | } | |
9ec36caf | 144 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
a613b26a RH |
145 | pr_debug("not all legacy IRQ resources mapped for %pOFn\n", |
146 | np); | |
ac80a51e | 147 | } |
94c09319 GL |
148 | |
149 | dev->dev.of_node = of_node_get(np); | |
f94277af | 150 | dev->dev.fwnode = &np->fwnode; |
43c0767e | 151 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
152 | |
153 | if (bus_id) | |
154 | dev_set_name(&dev->dev, "%s", bus_id); | |
155 | else | |
156 | of_device_make_bus_id(&dev->dev); | |
157 | ||
158 | return dev; | |
159 | } | |
160 | EXPORT_SYMBOL(of_device_alloc); | |
161 | ||
5fd200f3 | 162 | /** |
15c3597d | 163 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
164 | * @np: pointer to node to create device for |
165 | * @bus_id: name to assign device | |
15c3597d | 166 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 167 | * @parent: Linux device model parent device. |
cd1e6504 GL |
168 | * |
169 | * Returns pointer to created platform device, or NULL if a device was not | |
170 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 171 | */ |
245d9641 | 172 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
173 | struct device_node *np, |
174 | const char *bus_id, | |
175 | void *platform_data, | |
176 | struct device *parent) | |
5fd200f3 | 177 | { |
94a0cb1f | 178 | struct platform_device *dev; |
5fd200f3 | 179 | |
c6e126de PM |
180 | if (!of_device_is_available(np) || |
181 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
182 | return NULL; |
183 | ||
5fd200f3 GL |
184 | dev = of_device_alloc(np, bus_id, parent); |
185 | if (!dev) | |
c6e126de | 186 | goto err_clear_flag; |
5fd200f3 | 187 | |
a5516219 RM |
188 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
189 | if (!dev->dev.dma_mask) | |
190 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
eca39301 | 191 | dev->dev.bus = &platform_bus_type; |
15c3597d | 192 | dev->dev.platform_data = platform_data; |
c706c239 | 193 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 194 | |
7096d042 GL |
195 | if (of_device_add(dev) != 0) { |
196 | platform_device_put(dev); | |
c6e126de | 197 | goto err_clear_flag; |
5fd200f3 GL |
198 | } |
199 | ||
200 | return dev; | |
c6e126de PM |
201 | |
202 | err_clear_flag: | |
203 | of_node_clear_flag(np, OF_POPULATED); | |
204 | return NULL; | |
5fd200f3 | 205 | } |
15c3597d GL |
206 | |
207 | /** | |
208 | * of_platform_device_create - Alloc, initialize and register an of_device | |
209 | * @np: pointer to node to create device for | |
210 | * @bus_id: name to assign device | |
211 | * @parent: Linux device model parent device. | |
212 | * | |
213 | * Returns pointer to created platform device, or NULL if a device was not | |
214 | * registered. Unavailable devices will not get registered. | |
215 | */ | |
216 | struct platform_device *of_platform_device_create(struct device_node *np, | |
217 | const char *bus_id, | |
218 | struct device *parent) | |
219 | { | |
220 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
221 | } | |
5fd200f3 GL |
222 | EXPORT_SYMBOL(of_platform_device_create); |
223 | ||
5de1540b GL |
224 | #ifdef CONFIG_ARM_AMBA |
225 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
226 | const char *bus_id, | |
227 | void *platform_data, | |
228 | struct device *parent) | |
229 | { | |
230 | struct amba_device *dev; | |
231 | const void *prop; | |
232 | int i, ret; | |
233 | ||
0d638a07 | 234 | pr_debug("Creating amba device %pOF\n", node); |
5de1540b | 235 | |
c6e126de PM |
236 | if (!of_device_is_available(node) || |
237 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
238 | return NULL; |
239 | ||
c0f72f8a | 240 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 241 | if (!dev) |
c6e126de | 242 | goto err_clear_flag; |
5de1540b | 243 | |
8c89ef7b LW |
244 | /* AMBA devices only support a single DMA mask */ |
245 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
246 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
247 | ||
5de1540b | 248 | /* setup generic device info */ |
5de1540b | 249 | dev->dev.of_node = of_node_get(node); |
f94277af | 250 | dev->dev.fwnode = &node->fwnode; |
43c0767e | 251 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
252 | dev->dev.platform_data = platform_data; |
253 | if (bus_id) | |
254 | dev_set_name(&dev->dev, "%s", bus_id); | |
255 | else | |
256 | of_device_make_bus_id(&dev->dev); | |
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) { |
0d638a07 RH |
269 | pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", |
270 | ret, node); | |
5de1540b | 271 | goto err_free; |
2bc552df | 272 | } |
5de1540b | 273 | |
c0f72f8a | 274 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 275 | if (ret) { |
0d638a07 RH |
276 | pr_err("amba_device_add() failed (%d) for %pOF\n", |
277 | ret, node); | |
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; |
0d638a07 | 320 | pr_debug("%pOF: devname=%s\n", np, auxdata->name); |
fc5cf80a TL |
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) { | |
0d638a07 | 333 | pr_debug("%pOF: compatible match\n", np); |
fc5cf80a TL |
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))) { | |
0d638a07 RH |
366 | pr_debug("%s() - skipping %pOF, no compatible prop\n", |
367 | __func__, bus); | |
29d4f8a4 GL |
368 | return 0; |
369 | } | |
370 | ||
4550fe63 VK |
371 | /* Skip nodes for which we don't want to create devices */ |
372 | if (unlikely(of_match_node(of_skipped_node_table, bus))) { | |
373 | pr_debug("%s() - skipping %pOF node\n", __func__, bus); | |
374 | return 0; | |
375 | } | |
376 | ||
44a7185c | 377 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
0d638a07 RH |
378 | pr_debug("%s() - skipping %pOF, already populated\n", |
379 | __func__, bus); | |
44a7185c KW |
380 | return 0; |
381 | } | |
382 | ||
15c3597d GL |
383 | auxdata = of_dev_lookup(lookup, bus); |
384 | if (auxdata) { | |
385 | bus_id = auxdata->name; | |
386 | platform_data = auxdata->platform_data; | |
387 | } | |
388 | ||
5de1540b | 389 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
390 | /* |
391 | * Don't return an error here to keep compatibility with older | |
392 | * device tree files. | |
393 | */ | |
15c3597d | 394 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
395 | return 0; |
396 | } | |
397 | ||
15c3597d | 398 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
399 | if (!dev || !of_match_node(matches, bus)) |
400 | return 0; | |
401 | ||
5fd200f3 | 402 | for_each_child_of_node(bus, child) { |
0d638a07 | 403 | pr_debug(" create child: %pOF\n", child); |
15c3597d | 404 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
405 | if (rc) { |
406 | of_node_put(child); | |
407 | break; | |
408 | } | |
409 | } | |
75f353b6 | 410 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
411 | return rc; |
412 | } | |
413 | ||
414 | /** | |
38e9e21d | 415 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 416 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 417 | * @matches: match table for bus nodes |
5fd200f3 GL |
418 | * @parent: parent to hook devices from, NULL for toplevel |
419 | * | |
420 | * Note that children of the provided root are not instantiated as devices | |
421 | * unless the specified root itself matches the bus list and is not NULL. | |
422 | */ | |
423 | int of_platform_bus_probe(struct device_node *root, | |
424 | const struct of_device_id *matches, | |
425 | struct device *parent) | |
426 | { | |
427 | struct device_node *child; | |
5fd200f3 GL |
428 | int rc = 0; |
429 | ||
1eed4c07 GL |
430 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
431 | if (!root) | |
60d59913 | 432 | return -EINVAL; |
5fd200f3 | 433 | |
44a7185c | 434 | pr_debug("%s()\n", __func__); |
0d638a07 | 435 | pr_debug(" starting at: %pOF\n", root); |
5fd200f3 | 436 | |
1eed4c07 | 437 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 438 | if (of_match_node(matches, root)) { |
15c3597d | 439 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 440 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
441 | if (!of_match_node(matches, child)) |
442 | continue; | |
15c3597d | 443 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
444 | if (rc) { |
445 | of_node_put(child); | |
5fd200f3 | 446 | break; |
7fad948a | 447 | } |
5fd200f3 | 448 | } |
38e9e21d | 449 | |
5fd200f3 GL |
450 | of_node_put(root); |
451 | return rc; | |
452 | } | |
453 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
454 | |
455 | /** | |
456 | * of_platform_populate() - Populate platform_devices from device tree data | |
457 | * @root: parent of the first level to probe or NULL for the root of the tree | |
458 | * @matches: match table, NULL to use the default | |
92039ed1 | 459 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
460 | * @parent: parent to hook devices from, NULL for toplevel |
461 | * | |
462 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
463 | * and creates devices from nodes. It differs in that it follows the modern | |
464 | * convention of requiring all device nodes to have a 'compatible' property, | |
465 | * and it is suitable for creating devices which are children of the root | |
466 | * node (of_platform_bus_probe will only create children of the root which | |
467 | * are selected by the @matches argument). | |
468 | * | |
469 | * New board support should be using this function instead of | |
470 | * of_platform_bus_probe(). | |
471 | * | |
472 | * Returns 0 on success, < 0 on failure. | |
473 | */ | |
474 | int of_platform_populate(struct device_node *root, | |
475 | const struct of_device_id *matches, | |
15c3597d | 476 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
477 | struct device *parent) |
478 | { | |
479 | struct device_node *child; | |
480 | int rc = 0; | |
481 | ||
482 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
483 | if (!root) | |
484 | return -EINVAL; | |
485 | ||
44a7185c | 486 | pr_debug("%s()\n", __func__); |
0d638a07 | 487 | pr_debug(" starting at: %pOF\n", root); |
44a7185c | 488 | |
29d4f8a4 | 489 | for_each_child_of_node(root, child) { |
15c3597d | 490 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
491 | if (rc) { |
492 | of_node_put(child); | |
29d4f8a4 | 493 | break; |
7fad948a | 494 | } |
29d4f8a4 | 495 | } |
2d0747c4 | 496 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
497 | |
498 | of_node_put(root); | |
499 | return rc; | |
500 | } | |
e001f1c8 | 501 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 502 | |
43443ad6 HM |
503 | int of_platform_default_populate(struct device_node *root, |
504 | const struct of_dev_auxdata *lookup, | |
505 | struct device *parent) | |
506 | { | |
507 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
508 | parent); | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
511 | ||
fc520f8b | 512 | #ifndef CONFIG_PPC |
a50ff19d | 513 | static const struct of_device_id reserved_mem_matches[] = { |
d1de6d6c | 514 | { .compatible = "qcom,rmtfs-mem" }, |
312416d9 | 515 | { .compatible = "qcom,cmd-db" }, |
a50ff19d BA |
516 | { .compatible = "ramoops" }, |
517 | {} | |
518 | }; | |
519 | ||
44a7185c KW |
520 | static int __init of_platform_default_populate_init(void) |
521 | { | |
529182e2 KC |
522 | struct device_node *node; |
523 | ||
524 | if (!of_have_populated_dt()) | |
525 | return -ENODEV; | |
526 | ||
527 | /* | |
a50ff19d BA |
528 | * Handle certain compatibles explicitly, since we don't want to create |
529 | * platform_devices for every node in /reserved-memory with a | |
530 | * "compatible", | |
529182e2 | 531 | */ |
a50ff19d BA |
532 | for_each_matching_node(node, reserved_mem_matches) |
533 | of_platform_device_create(node, NULL, NULL); | |
529182e2 | 534 | |
3aa0582f | 535 | node = of_find_node_by_path("/firmware"); |
e2105ca8 | 536 | if (node) { |
3aa0582f | 537 | of_platform_populate(node, NULL, NULL, NULL); |
e2105ca8 SH |
538 | of_node_put(node); |
539 | } | |
3aa0582f | 540 | |
529182e2 KC |
541 | /* Populate everything else. */ |
542 | of_platform_default_populate(NULL, NULL, NULL); | |
44a7185c KW |
543 | |
544 | return 0; | |
545 | } | |
546 | arch_initcall_sync(of_platform_default_populate_init); | |
fc520f8b | 547 | #endif |
44a7185c | 548 | |
c2372c20 | 549 | int of_platform_device_destroy(struct device *dev, void *data) |
c6e126de | 550 | { |
c6e126de | 551 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 552 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 553 | return 0; |
c6e126de | 554 | |
75f353b6 GL |
555 | /* Recurse for any nodes that were treated as busses */ |
556 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
557 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de | 558 | |
522811e9 SK |
559 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
560 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); | |
561 | ||
c6e126de PM |
562 | if (dev->bus == &platform_bus_type) |
563 | platform_device_unregister(to_platform_device(dev)); | |
564 | #ifdef CONFIG_ARM_AMBA | |
565 | else if (dev->bus == &amba_bustype) | |
566 | amba_device_unregister(to_amba_device(dev)); | |
567 | #endif | |
c6e126de | 568 | |
c6e126de PM |
569 | return 0; |
570 | } | |
c2372c20 | 571 | EXPORT_SYMBOL_GPL(of_platform_device_destroy); |
c6e126de PM |
572 | |
573 | /** | |
574 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 575 | * @parent: device which children will be removed |
c6e126de PM |
576 | * |
577 | * Complementary to of_platform_populate(), this function removes children | |
578 | * of the given device (and, recurrently, their children) that have been | |
579 | * created from their respective device tree nodes (and only those, | |
580 | * leaving others - eg. manually created - unharmed). | |
c6e126de | 581 | */ |
75f353b6 | 582 | void of_platform_depopulate(struct device *parent) |
c6e126de | 583 | { |
2d0747c4 GL |
584 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
585 | device_for_each_child(parent, NULL, of_platform_device_destroy); | |
586 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); | |
587 | } | |
c6e126de PM |
588 | } |
589 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
590 | ||
38b0b219 BG |
591 | static void devm_of_platform_populate_release(struct device *dev, void *res) |
592 | { | |
593 | of_platform_depopulate(*(struct device **)res); | |
594 | } | |
595 | ||
596 | /** | |
597 | * devm_of_platform_populate() - Populate platform_devices from device tree data | |
598 | * @dev: device that requested to populate from device tree data | |
599 | * | |
600 | * Similar to of_platform_populate(), but will automatically call | |
601 | * of_platform_depopulate() when the device is unbound from the bus. | |
602 | * | |
603 | * Returns 0 on success, < 0 on failure. | |
604 | */ | |
605 | int devm_of_platform_populate(struct device *dev) | |
606 | { | |
607 | struct device **ptr; | |
608 | int ret; | |
609 | ||
610 | if (!dev) | |
611 | return -EINVAL; | |
612 | ||
613 | ptr = devres_alloc(devm_of_platform_populate_release, | |
614 | sizeof(*ptr), GFP_KERNEL); | |
615 | if (!ptr) | |
616 | return -ENOMEM; | |
617 | ||
618 | ret = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
619 | if (ret) { | |
620 | devres_free(ptr); | |
621 | } else { | |
622 | *ptr = dev; | |
623 | devres_add(dev, ptr); | |
624 | } | |
625 | ||
626 | return ret; | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(devm_of_platform_populate); | |
629 | ||
630 | static int devm_of_platform_match(struct device *dev, void *res, void *data) | |
631 | { | |
632 | struct device **ptr = res; | |
633 | ||
634 | if (!ptr) { | |
635 | WARN_ON(!ptr); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | return *ptr == data; | |
640 | } | |
641 | ||
642 | /** | |
643 | * devm_of_platform_depopulate() - Remove devices populated from device tree | |
644 | * @dev: device that requested to depopulate from device tree data | |
645 | * | |
646 | * Complementary to devm_of_platform_populate(), this function removes children | |
647 | * of the given device (and, recurrently, their children) that have been | |
648 | * created from their respective device tree nodes (and only those, | |
649 | * leaving others - eg. manually created - unharmed). | |
650 | */ | |
651 | void devm_of_platform_depopulate(struct device *dev) | |
652 | { | |
653 | int ret; | |
654 | ||
655 | ret = devres_release(dev, devm_of_platform_populate_release, | |
656 | devm_of_platform_match, dev); | |
657 | ||
658 | WARN_ON(ret); | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); | |
661 | ||
801d728c PA |
662 | #ifdef CONFIG_OF_DYNAMIC |
663 | static int of_platform_notify(struct notifier_block *nb, | |
664 | unsigned long action, void *arg) | |
665 | { | |
666 | struct of_reconfig_data *rd = arg; | |
667 | struct platform_device *pdev_parent, *pdev; | |
668 | bool children_left; | |
669 | ||
670 | switch (of_reconfig_get_state_change(action, rd)) { | |
671 | case OF_RECONFIG_CHANGE_ADD: | |
672 | /* verify that the parent is a bus */ | |
673 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
674 | return NOTIFY_OK; /* not for us */ | |
675 | ||
15204ab1 PA |
676 | /* already populated? (driver using of_populate manually) */ |
677 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
678 | return NOTIFY_OK; | |
679 | ||
801d728c PA |
680 | /* pdev_parent may be NULL when no bus platform device */ |
681 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
682 | pdev = of_platform_device_create(rd->dn, NULL, | |
683 | pdev_parent ? &pdev_parent->dev : NULL); | |
684 | of_dev_put(pdev_parent); | |
685 | ||
686 | if (pdev == NULL) { | |
0d638a07 RH |
687 | pr_err("%s: failed to create for '%pOF'\n", |
688 | __func__, rd->dn); | |
801d728c PA |
689 | /* of_platform_device_create tosses the error code */ |
690 | return notifier_from_errno(-EINVAL); | |
691 | } | |
692 | break; | |
693 | ||
694 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
695 | |
696 | /* already depopulated? */ | |
697 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
698 | return NOTIFY_OK; | |
699 | ||
801d728c PA |
700 | /* find our device by node */ |
701 | pdev = of_find_device_by_node(rd->dn); | |
702 | if (pdev == NULL) | |
703 | return NOTIFY_OK; /* no? not meant for us */ | |
704 | ||
705 | /* unregister takes one ref away */ | |
706 | of_platform_device_destroy(&pdev->dev, &children_left); | |
707 | ||
708 | /* and put the reference of the find */ | |
709 | of_dev_put(pdev); | |
710 | break; | |
711 | } | |
712 | ||
713 | return NOTIFY_OK; | |
714 | } | |
715 | ||
716 | static struct notifier_block platform_of_notifier = { | |
717 | .notifier_call = of_platform_notify, | |
718 | }; | |
719 | ||
720 | void of_platform_register_reconfig_notifier(void) | |
721 | { | |
722 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
723 | } | |
724 | #endif /* CONFIG_OF_DYNAMIC */ | |
725 | ||
964dba28 | 726 | #endif /* CONFIG_OF_ADDRESS */ |