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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> |
9e3288dc | 20 | #include <linux/of_irq.h> |
3f23de10 | 21 | #include <linux/of_platform.h> |
eca39301 GL |
22 | #include <linux/platform_device.h> |
23 | ||
cbb49c26 GL |
24 | const struct of_device_id of_default_bus_match_table[] = { |
25 | { .compatible = "simple-bus", }, | |
22869a9e | 26 | { .compatible = "simple-mfd", }, |
ecd76ede | 27 | { .compatible = "isa", }, |
cbb49c26 GL |
28 | #ifdef CONFIG_ARM_AMBA |
29 | { .compatible = "arm,amba-bus", }, | |
30 | #endif /* CONFIG_ARM_AMBA */ | |
31 | {} /* Empty terminated list */ | |
32 | }; | |
33 | ||
4550fe63 VK |
34 | static const struct of_device_id of_skipped_node_table[] = { |
35 | { .compatible = "operating-points-v2", }, | |
36 | {} /* Empty terminated list */ | |
37 | }; | |
38 | ||
c6085584 JB |
39 | /** |
40 | * of_find_device_by_node - Find the platform_device associated with a node | |
41 | * @np: Pointer to device tree node | |
42 | * | |
4fb373df JH |
43 | * Takes a reference to the embedded struct device which needs to be dropped |
44 | * after use. | |
45 | * | |
8c8239c2 | 46 | * Return: platform_device pointer, or NULL if not found |
c6085584 JB |
47 | */ |
48 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
49 | { | |
50 | struct device *dev; | |
51 | ||
cfba5de9 | 52 | dev = bus_find_device_by_of_node(&platform_bus_type, np); |
c6085584 JB |
53 | return dev ? to_platform_device(dev) : NULL; |
54 | } | |
55 | EXPORT_SYMBOL(of_find_device_by_node); | |
56 | ||
964dba28 | 57 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
58 | /* |
59 | * The following routines scan a subtree and registers a device for | |
60 | * each applicable node. | |
61 | * | |
62 | * Note: sparc doesn't use these routines because it has a different | |
63 | * mechanism for creating devices from device tree nodes. | |
64 | */ | |
65 | ||
94c09319 GL |
66 | /** |
67 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
68 | * @dev: pointer to device structure that is linked to a device tree node | |
69 | * | |
07e461cd GL |
70 | * This routine will first try using the translated bus address to |
71 | * derive a unique name. If it cannot, then it will prepend names from | |
72 | * parent nodes until a unique name can be derived. | |
94c09319 | 73 | */ |
e553f539 | 74 | static void of_device_make_bus_id(struct device *dev) |
94c09319 | 75 | { |
94c09319 | 76 | struct device_node *node = dev->of_node; |
24fb530f | 77 | const __be32 *reg; |
94c09319 | 78 | u64 addr; |
68d16195 | 79 | u32 mask; |
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) { | |
68d16195 RH |
89 | if (!of_property_read_u32(node, "mask", &mask)) |
90 | dev_set_name(dev, dev_name(dev) ? "%llx.%x.%pOFn:%s" : "%llx.%x.%pOFn", | |
91 | addr, ffs(mask) - 1, node, dev_name(dev)); | |
92 | ||
93 | else | |
94 | dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", | |
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; |
a1a2b712 | 117 | int rc, i, num_reg = 0; |
32e8f9b3 | 118 | struct resource *res; |
ac80a51e | 119 | |
6d7e3bf8 | 120 | dev = platform_device_alloc("", PLATFORM_DEVID_NONE); |
7096d042 GL |
121 | if (!dev) |
122 | return NULL; | |
123 | ||
a1a2b712 | 124 | /* count the io resources */ |
32e8f9b3 | 125 | num_reg = of_address_count(np); |
ac80a51e | 126 | |
ac80a51e | 127 | /* Populate the resource table */ |
a1a2b712 LP |
128 | if (num_reg) { |
129 | res = kcalloc(num_reg, sizeof(*res), GFP_KERNEL); | |
7096d042 GL |
130 | if (!res) { |
131 | platform_device_put(dev); | |
132 | return NULL; | |
133 | } | |
134 | ||
a1a2b712 | 135 | dev->num_resources = num_reg; |
ac80a51e GL |
136 | dev->resource = res; |
137 | for (i = 0; i < num_reg; i++, res++) { | |
138 | rc = of_address_to_resource(np, i, res); | |
139 | WARN_ON(rc); | |
140 | } | |
ac80a51e | 141 | } |
94c09319 GL |
142 | |
143 | dev->dev.of_node = of_node_get(np); | |
f94277af | 144 | dev->dev.fwnode = &np->fwnode; |
43c0767e | 145 | dev->dev.parent = parent ? : &platform_bus; |
94c09319 GL |
146 | |
147 | if (bus_id) | |
148 | dev_set_name(&dev->dev, "%s", bus_id); | |
149 | else | |
150 | of_device_make_bus_id(&dev->dev); | |
151 | ||
152 | return dev; | |
153 | } | |
154 | EXPORT_SYMBOL(of_device_alloc); | |
155 | ||
5fd200f3 | 156 | /** |
15c3597d | 157 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
158 | * @np: pointer to node to create device for |
159 | * @bus_id: name to assign device | |
15c3597d | 160 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 161 | * @parent: Linux device model parent device. |
cd1e6504 | 162 | * |
8c8239c2 | 163 | * Return: Pointer to created platform device, or NULL if a device was not |
cd1e6504 | 164 | * registered. Unavailable devices will not get registered. |
5fd200f3 | 165 | */ |
245d9641 | 166 | static struct platform_device *of_platform_device_create_pdata( |
15c3597d GL |
167 | struct device_node *np, |
168 | const char *bus_id, | |
169 | void *platform_data, | |
170 | struct device *parent) | |
5fd200f3 | 171 | { |
94a0cb1f | 172 | struct platform_device *dev; |
5fd200f3 | 173 | |
c6e126de PM |
174 | if (!of_device_is_available(np) || |
175 | of_node_test_and_set_flag(np, OF_POPULATED)) | |
cd1e6504 GL |
176 | return NULL; |
177 | ||
5fd200f3 GL |
178 | dev = of_device_alloc(np, bus_id, parent); |
179 | if (!dev) | |
c6e126de | 180 | goto err_clear_flag; |
5fd200f3 | 181 | |
a5516219 RM |
182 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
183 | if (!dev->dev.dma_mask) | |
184 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
eca39301 | 185 | dev->dev.bus = &platform_bus_type; |
15c3597d | 186 | dev->dev.platform_data = platform_data; |
c706c239 | 187 | of_msi_configure(&dev->dev, dev->dev.of_node); |
5fd200f3 | 188 | |
7096d042 GL |
189 | if (of_device_add(dev) != 0) { |
190 | platform_device_put(dev); | |
c6e126de | 191 | goto err_clear_flag; |
5fd200f3 GL |
192 | } |
193 | ||
194 | return dev; | |
c6e126de PM |
195 | |
196 | err_clear_flag: | |
197 | of_node_clear_flag(np, OF_POPULATED); | |
198 | return NULL; | |
5fd200f3 | 199 | } |
15c3597d GL |
200 | |
201 | /** | |
202 | * of_platform_device_create - Alloc, initialize and register an of_device | |
203 | * @np: pointer to node to create device for | |
204 | * @bus_id: name to assign device | |
205 | * @parent: Linux device model parent device. | |
206 | * | |
8c8239c2 | 207 | * Return: Pointer to created platform device, or NULL if a device was not |
15c3597d GL |
208 | * registered. Unavailable devices will not get registered. |
209 | */ | |
210 | struct platform_device *of_platform_device_create(struct device_node *np, | |
211 | const char *bus_id, | |
212 | struct device *parent) | |
213 | { | |
214 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
215 | } | |
5fd200f3 GL |
216 | EXPORT_SYMBOL(of_platform_device_create); |
217 | ||
5de1540b GL |
218 | #ifdef CONFIG_ARM_AMBA |
219 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
220 | const char *bus_id, | |
221 | void *platform_data, | |
222 | struct device *parent) | |
223 | { | |
224 | struct amba_device *dev; | |
854f695c | 225 | int ret; |
5de1540b | 226 | |
0d638a07 | 227 | pr_debug("Creating amba device %pOF\n", node); |
5de1540b | 228 | |
c6e126de PM |
229 | if (!of_device_is_available(node) || |
230 | of_node_test_and_set_flag(node, OF_POPULATED)) | |
5de1540b GL |
231 | return NULL; |
232 | ||
c0f72f8a | 233 | dev = amba_device_alloc(NULL, 0, 0); |
606ad42a | 234 | if (!dev) |
c6e126de | 235 | goto err_clear_flag; |
5de1540b | 236 | |
8c89ef7b LW |
237 | /* AMBA devices only support a single DMA mask */ |
238 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); | |
239 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; | |
240 | ||
5de1540b | 241 | /* setup generic device info */ |
5de1540b | 242 | dev->dev.of_node = of_node_get(node); |
f94277af | 243 | dev->dev.fwnode = &node->fwnode; |
43c0767e | 244 | dev->dev.parent = parent ? : &platform_bus; |
5de1540b GL |
245 | dev->dev.platform_data = platform_data; |
246 | if (bus_id) | |
247 | dev_set_name(&dev->dev, "%s", bus_id); | |
248 | else | |
249 | of_device_make_bus_id(&dev->dev); | |
250 | ||
5de1540b | 251 | /* Allow the HW Peripheral ID to be overridden */ |
16b0c7ca | 252 | of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid); |
5de1540b | 253 | |
5de1540b | 254 | ret = of_address_to_resource(node, 0, &dev->res); |
2bc552df | 255 | if (ret) { |
0d638a07 RH |
256 | pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", |
257 | ret, node); | |
5de1540b | 258 | goto err_free; |
2bc552df | 259 | } |
5de1540b | 260 | |
c0f72f8a | 261 | ret = amba_device_add(dev, &iomem_resource); |
2bc552df | 262 | if (ret) { |
0d638a07 RH |
263 | pr_err("amba_device_add() failed (%d) for %pOF\n", |
264 | ret, node); | |
5de1540b | 265 | goto err_free; |
2bc552df | 266 | } |
5de1540b GL |
267 | |
268 | return dev; | |
269 | ||
270 | err_free: | |
c0f72f8a | 271 | amba_device_put(dev); |
c6e126de PM |
272 | err_clear_flag: |
273 | of_node_clear_flag(node, OF_POPULATED); | |
5de1540b GL |
274 | return NULL; |
275 | } | |
276 | #else /* CONFIG_ARM_AMBA */ | |
277 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
278 | const char *bus_id, | |
279 | void *platform_data, | |
280 | struct device *parent) | |
281 | { | |
282 | return NULL; | |
283 | } | |
284 | #endif /* CONFIG_ARM_AMBA */ | |
285 | ||
f3896a7e | 286 | /* |
f9a529b9 | 287 | * of_dev_lookup() - Given a device node, lookup the preferred Linux name |
15c3597d GL |
288 | */ |
289 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
290 | struct device_node *np) | |
291 | { | |
fc5cf80a | 292 | const struct of_dev_auxdata *auxdata; |
15c3597d | 293 | struct resource res; |
fc5cf80a | 294 | int compatible = 0; |
303f59d1 OJ |
295 | |
296 | if (!lookup) | |
297 | return NULL; | |
298 | ||
fc5cf80a TL |
299 | auxdata = lookup; |
300 | for (; auxdata->compatible; auxdata++) { | |
301 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
303f59d1 | 302 | continue; |
fc5cf80a | 303 | compatible++; |
84774e61 | 304 | if (!of_address_to_resource(np, 0, &res)) |
fc5cf80a | 305 | if (res.start != auxdata->phys_addr) |
84774e61 | 306 | continue; |
0d638a07 | 307 | pr_debug("%pOF: devname=%s\n", np, auxdata->name); |
fc5cf80a TL |
308 | return auxdata; |
309 | } | |
310 | ||
311 | if (!compatible) | |
312 | return NULL; | |
313 | ||
314 | /* Try compatible match if no phys_addr and name are specified */ | |
315 | auxdata = lookup; | |
316 | for (; auxdata->compatible; auxdata++) { | |
317 | if (!of_device_is_compatible(np, auxdata->compatible)) | |
318 | continue; | |
319 | if (!auxdata->phys_addr && !auxdata->name) { | |
0d638a07 | 320 | pr_debug("%pOF: compatible match\n", np); |
fc5cf80a TL |
321 | return auxdata; |
322 | } | |
15c3597d | 323 | } |
303f59d1 | 324 | |
15c3597d GL |
325 | return NULL; |
326 | } | |
327 | ||
5fd200f3 | 328 | /** |
38e9e21d | 329 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 330 | * @bus: device node of the bus to instantiate |
1eed4c07 | 331 | * @matches: match table for bus nodes |
303f59d1 | 332 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 333 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 334 | * @strict: require compatible property |
38e9e21d GL |
335 | * |
336 | * Creates a platform_device for the provided device_node, and optionally | |
337 | * recursively create devices for all the child nodes. | |
5fd200f3 | 338 | */ |
38e9e21d | 339 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 340 | const struct of_device_id *matches, |
15c3597d | 341 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 342 | struct device *parent, bool strict) |
5fd200f3 | 343 | { |
15c3597d | 344 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 345 | struct device_node *child; |
94a0cb1f | 346 | struct platform_device *dev; |
15c3597d GL |
347 | const char *bus_id = NULL; |
348 | void *platform_data = NULL; | |
5fd200f3 GL |
349 | int rc = 0; |
350 | ||
29d4f8a4 GL |
351 | /* Make sure it has a compatible property */ |
352 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
0d638a07 RH |
353 | pr_debug("%s() - skipping %pOF, no compatible prop\n", |
354 | __func__, bus); | |
29d4f8a4 GL |
355 | return 0; |
356 | } | |
357 | ||
4550fe63 VK |
358 | /* Skip nodes for which we don't want to create devices */ |
359 | if (unlikely(of_match_node(of_skipped_node_table, bus))) { | |
360 | pr_debug("%s() - skipping %pOF node\n", __func__, bus); | |
361 | return 0; | |
362 | } | |
363 | ||
44a7185c | 364 | if (of_node_check_flag(bus, OF_POPULATED_BUS)) { |
0d638a07 RH |
365 | pr_debug("%s() - skipping %pOF, already populated\n", |
366 | __func__, bus); | |
44a7185c KW |
367 | return 0; |
368 | } | |
369 | ||
15c3597d GL |
370 | auxdata = of_dev_lookup(lookup, bus); |
371 | if (auxdata) { | |
372 | bus_id = auxdata->name; | |
373 | platform_data = auxdata->platform_data; | |
374 | } | |
375 | ||
5de1540b | 376 | if (of_device_is_compatible(bus, "arm,primecell")) { |
2bc552df BZ |
377 | /* |
378 | * Don't return an error here to keep compatibility with older | |
379 | * device tree files. | |
380 | */ | |
15c3597d | 381 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
382 | return 0; |
383 | } | |
384 | ||
15c3597d | 385 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
386 | if (!dev || !of_match_node(matches, bus)) |
387 | return 0; | |
388 | ||
5fd200f3 | 389 | for_each_child_of_node(bus, child) { |
0d638a07 | 390 | pr_debug(" create child: %pOF\n", child); |
15c3597d | 391 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
392 | if (rc) { |
393 | of_node_put(child); | |
394 | break; | |
395 | } | |
396 | } | |
75f353b6 | 397 | of_node_set_flag(bus, OF_POPULATED_BUS); |
5fd200f3 GL |
398 | return rc; |
399 | } | |
400 | ||
401 | /** | |
38e9e21d | 402 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 403 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 404 | * @matches: match table for bus nodes |
5fd200f3 GL |
405 | * @parent: parent to hook devices from, NULL for toplevel |
406 | * | |
407 | * Note that children of the provided root are not instantiated as devices | |
408 | * unless the specified root itself matches the bus list and is not NULL. | |
409 | */ | |
410 | int of_platform_bus_probe(struct device_node *root, | |
411 | const struct of_device_id *matches, | |
412 | struct device *parent) | |
413 | { | |
414 | struct device_node *child; | |
5fd200f3 GL |
415 | int rc = 0; |
416 | ||
1eed4c07 GL |
417 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
418 | if (!root) | |
60d59913 | 419 | return -EINVAL; |
5fd200f3 | 420 | |
44a7185c | 421 | pr_debug("%s()\n", __func__); |
0d638a07 | 422 | pr_debug(" starting at: %pOF\n", root); |
5fd200f3 | 423 | |
1eed4c07 | 424 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 425 | if (of_match_node(matches, root)) { |
15c3597d | 426 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 427 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
428 | if (!of_match_node(matches, child)) |
429 | continue; | |
15c3597d | 430 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
7fad948a JL |
431 | if (rc) { |
432 | of_node_put(child); | |
5fd200f3 | 433 | break; |
7fad948a | 434 | } |
5fd200f3 | 435 | } |
38e9e21d | 436 | |
5fd200f3 GL |
437 | of_node_put(root); |
438 | return rc; | |
439 | } | |
440 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
441 | |
442 | /** | |
443 | * of_platform_populate() - Populate platform_devices from device tree data | |
444 | * @root: parent of the first level to probe or NULL for the root of the tree | |
445 | * @matches: match table, NULL to use the default | |
92039ed1 | 446 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
447 | * @parent: parent to hook devices from, NULL for toplevel |
448 | * | |
449 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
450 | * and creates devices from nodes. It differs in that it follows the modern | |
451 | * convention of requiring all device nodes to have a 'compatible' property, | |
452 | * and it is suitable for creating devices which are children of the root | |
453 | * node (of_platform_bus_probe will only create children of the root which | |
454 | * are selected by the @matches argument). | |
455 | * | |
456 | * New board support should be using this function instead of | |
457 | * of_platform_bus_probe(). | |
458 | * | |
8c8239c2 | 459 | * Return: 0 on success, < 0 on failure. |
29d4f8a4 GL |
460 | */ |
461 | int of_platform_populate(struct device_node *root, | |
462 | const struct of_device_id *matches, | |
15c3597d | 463 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
464 | struct device *parent) |
465 | { | |
466 | struct device_node *child; | |
467 | int rc = 0; | |
468 | ||
469 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
470 | if (!root) | |
471 | return -EINVAL; | |
472 | ||
44a7185c | 473 | pr_debug("%s()\n", __func__); |
0d638a07 | 474 | pr_debug(" starting at: %pOF\n", root); |
44a7185c | 475 | |
5e666938 | 476 | device_links_supplier_sync_state_pause(); |
29d4f8a4 | 477 | for_each_child_of_node(root, child) { |
15c3597d | 478 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
7fad948a JL |
479 | if (rc) { |
480 | of_node_put(child); | |
29d4f8a4 | 481 | break; |
7fad948a | 482 | } |
29d4f8a4 | 483 | } |
5e666938 SK |
484 | device_links_supplier_sync_state_resume(); |
485 | ||
2d0747c4 | 486 | of_node_set_flag(root, OF_POPULATED_BUS); |
29d4f8a4 GL |
487 | |
488 | of_node_put(root); | |
489 | return rc; | |
490 | } | |
e001f1c8 | 491 | EXPORT_SYMBOL_GPL(of_platform_populate); |
c6e126de | 492 | |
43443ad6 HM |
493 | int of_platform_default_populate(struct device_node *root, |
494 | const struct of_dev_auxdata *lookup, | |
495 | struct device *parent) | |
496 | { | |
497 | return of_platform_populate(root, of_default_bus_match_table, lookup, | |
498 | parent); | |
499 | } | |
500 | EXPORT_SYMBOL_GPL(of_platform_default_populate); | |
501 | ||
a50ff19d | 502 | static const struct of_device_id reserved_mem_matches[] = { |
7090d2f1 | 503 | { .compatible = "phram" }, |
d1de6d6c | 504 | { .compatible = "qcom,rmtfs-mem" }, |
312416d9 | 505 | { .compatible = "qcom,cmd-db" }, |
b5af64fc | 506 | { .compatible = "qcom,smem" }, |
a50ff19d | 507 | { .compatible = "ramoops" }, |
5a3fa75a | 508 | { .compatible = "nvmem-rmem" }, |
f396eded | 509 | { .compatible = "google,open-dice" }, |
a50ff19d BA |
510 | {} |
511 | }; | |
512 | ||
44a7185c KW |
513 | static int __init of_platform_default_populate_init(void) |
514 | { | |
529182e2 KC |
515 | struct device_node *node; |
516 | ||
ee9b280e SK |
517 | device_links_supplier_sync_state_pause(); |
518 | ||
529182e2 KC |
519 | if (!of_have_populated_dt()) |
520 | return -ENODEV; | |
521 | ||
52b1b46c TZ |
522 | if (IS_ENABLED(CONFIG_PPC)) { |
523 | struct device_node *boot_display = NULL; | |
524 | struct platform_device *dev; | |
241d2fb5 | 525 | int display_number = 0; |
52b1b46c TZ |
526 | int ret; |
527 | ||
528 | /* Check if we have a MacOS display without a node spec */ | |
2f0cb475 | 529 | if (of_property_present(of_chosen, "linux,bootx-noscreen")) { |
52b1b46c TZ |
530 | /* |
531 | * The old code tried to work out which node was the MacOS | |
532 | * display based on the address. I'm dropping that since the | |
533 | * lack of a node spec only happens with old BootX versions | |
534 | * (users can update) and with this code, they'll still get | |
535 | * a display (just not the palette hacks). | |
536 | */ | |
537 | dev = platform_device_alloc("bootx-noscreen", 0); | |
538 | if (WARN_ON(!dev)) | |
539 | return -ENOMEM; | |
540 | ret = platform_device_add(dev); | |
541 | if (WARN_ON(ret)) { | |
542 | platform_device_put(dev); | |
543 | return ret; | |
544 | } | |
545 | } | |
529182e2 | 546 | |
52b1b46c TZ |
547 | /* |
548 | * For OF framebuffers, first create the device for the boot display, | |
549 | * then for the other framebuffers. Only fail for the boot display; | |
550 | * ignore errors for the rest. | |
551 | */ | |
552 | for_each_node_by_type(node, "display") { | |
553 | if (!of_get_property(node, "linux,opened", NULL) || | |
554 | !of_get_property(node, "linux,boot-display", NULL)) | |
555 | continue; | |
241d2fb5 MS |
556 | dev = of_platform_device_create(node, "of-display.0", NULL); |
557 | of_node_put(node); | |
52b1b46c TZ |
558 | if (WARN_ON(!dev)) |
559 | return -ENOMEM; | |
560 | boot_display = node; | |
241d2fb5 | 561 | display_number++; |
52b1b46c TZ |
562 | break; |
563 | } | |
564 | for_each_node_by_type(node, "display") { | |
241d2fb5 MS |
565 | char buf[14]; |
566 | const char *of_display_format = "of-display.%d"; | |
567 | ||
52b1b46c TZ |
568 | if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) |
569 | continue; | |
241d2fb5 MS |
570 | ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); |
571 | if (ret < sizeof(buf)) | |
572 | of_platform_device_create(node, buf, NULL); | |
52b1b46c TZ |
573 | } |
574 | ||
575 | } else { | |
576 | /* | |
577 | * Handle certain compatibles explicitly, since we don't want to create | |
578 | * platform_devices for every node in /reserved-memory with a | |
579 | * "compatible", | |
580 | */ | |
581 | for_each_matching_node(node, reserved_mem_matches) | |
582 | of_platform_device_create(node, NULL, NULL); | |
583 | ||
584 | node = of_find_node_by_path("/firmware"); | |
585 | if (node) { | |
586 | of_platform_populate(node, NULL, NULL, NULL); | |
587 | of_node_put(node); | |
588 | } | |
3aa0582f | 589 | |
52b1b46c TZ |
590 | node = of_get_compatible_child(of_chosen, "simple-framebuffer"); |
591 | of_platform_device_create(node, NULL, NULL); | |
592 | of_node_put(node); | |
2f92ea21 | 593 | |
52b1b46c TZ |
594 | /* Populate everything else. */ |
595 | of_platform_default_populate(NULL, NULL, NULL); | |
596 | } | |
44a7185c KW |
597 | |
598 | return 0; | |
599 | } | |
600 | arch_initcall_sync(of_platform_default_populate_init); | |
5e666938 SK |
601 | |
602 | static int __init of_platform_sync_state_init(void) | |
603 | { | |
ee9b280e | 604 | device_links_supplier_sync_state_resume(); |
5e666938 SK |
605 | return 0; |
606 | } | |
607 | late_initcall_sync(of_platform_sync_state_init); | |
44a7185c | 608 | |
c2372c20 | 609 | int of_platform_device_destroy(struct device *dev, void *data) |
c6e126de | 610 | { |
c6e126de | 611 | /* Do not touch devices not populated from the device tree */ |
75f353b6 | 612 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
c6e126de | 613 | return 0; |
c6e126de | 614 | |
75f353b6 GL |
615 | /* Recurse for any nodes that were treated as busses */ |
616 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) | |
617 | device_for_each_child(dev, NULL, of_platform_device_destroy); | |
c6e126de | 618 | |
522811e9 SK |
619 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
620 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); | |
621 | ||
c6e126de PM |
622 | if (dev->bus == &platform_bus_type) |
623 | platform_device_unregister(to_platform_device(dev)); | |
624 | #ifdef CONFIG_ARM_AMBA | |
625 | else if (dev->bus == &amba_bustype) | |
626 | amba_device_unregister(to_amba_device(dev)); | |
627 | #endif | |
c6e126de | 628 | |
c6e126de PM |
629 | return 0; |
630 | } | |
c2372c20 | 631 | EXPORT_SYMBOL_GPL(of_platform_device_destroy); |
c6e126de PM |
632 | |
633 | /** | |
634 | * of_platform_depopulate() - Remove devices populated from device tree | |
75f353b6 | 635 | * @parent: device which children will be removed |
c6e126de PM |
636 | * |
637 | * Complementary to of_platform_populate(), this function removes children | |
638 | * of the given device (and, recurrently, their children) that have been | |
639 | * created from their respective device tree nodes (and only those, | |
640 | * leaving others - eg. manually created - unharmed). | |
c6e126de | 641 | */ |
75f353b6 | 642 | void of_platform_depopulate(struct device *parent) |
c6e126de | 643 | { |
2d0747c4 | 644 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
70a29209 | 645 | device_for_each_child_reverse(parent, NULL, of_platform_device_destroy); |
2d0747c4 GL |
646 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); |
647 | } | |
c6e126de PM |
648 | } |
649 | EXPORT_SYMBOL_GPL(of_platform_depopulate); | |
650 | ||
38b0b219 BG |
651 | static void devm_of_platform_populate_release(struct device *dev, void *res) |
652 | { | |
653 | of_platform_depopulate(*(struct device **)res); | |
654 | } | |
655 | ||
656 | /** | |
657 | * devm_of_platform_populate() - Populate platform_devices from device tree data | |
658 | * @dev: device that requested to populate from device tree data | |
659 | * | |
660 | * Similar to of_platform_populate(), but will automatically call | |
661 | * of_platform_depopulate() when the device is unbound from the bus. | |
662 | * | |
8c8239c2 | 663 | * Return: 0 on success, < 0 on failure. |
38b0b219 BG |
664 | */ |
665 | int devm_of_platform_populate(struct device *dev) | |
666 | { | |
667 | struct device **ptr; | |
668 | int ret; | |
669 | ||
670 | if (!dev) | |
671 | return -EINVAL; | |
672 | ||
673 | ptr = devres_alloc(devm_of_platform_populate_release, | |
674 | sizeof(*ptr), GFP_KERNEL); | |
675 | if (!ptr) | |
676 | return -ENOMEM; | |
677 | ||
678 | ret = of_platform_populate(dev->of_node, NULL, NULL, dev); | |
679 | if (ret) { | |
680 | devres_free(ptr); | |
681 | } else { | |
682 | *ptr = dev; | |
683 | devres_add(dev, ptr); | |
684 | } | |
685 | ||
686 | return ret; | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(devm_of_platform_populate); | |
689 | ||
690 | static int devm_of_platform_match(struct device *dev, void *res, void *data) | |
691 | { | |
692 | struct device **ptr = res; | |
693 | ||
694 | if (!ptr) { | |
695 | WARN_ON(!ptr); | |
696 | return 0; | |
697 | } | |
698 | ||
699 | return *ptr == data; | |
700 | } | |
701 | ||
702 | /** | |
703 | * devm_of_platform_depopulate() - Remove devices populated from device tree | |
704 | * @dev: device that requested to depopulate from device tree data | |
705 | * | |
706 | * Complementary to devm_of_platform_populate(), this function removes children | |
707 | * of the given device (and, recurrently, their children) that have been | |
708 | * created from their respective device tree nodes (and only those, | |
709 | * leaving others - eg. manually created - unharmed). | |
710 | */ | |
711 | void devm_of_platform_depopulate(struct device *dev) | |
712 | { | |
713 | int ret; | |
714 | ||
715 | ret = devres_release(dev, devm_of_platform_populate_release, | |
716 | devm_of_platform_match, dev); | |
717 | ||
718 | WARN_ON(ret); | |
719 | } | |
720 | EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); | |
721 | ||
801d728c PA |
722 | #ifdef CONFIG_OF_DYNAMIC |
723 | static int of_platform_notify(struct notifier_block *nb, | |
724 | unsigned long action, void *arg) | |
725 | { | |
726 | struct of_reconfig_data *rd = arg; | |
727 | struct platform_device *pdev_parent, *pdev; | |
728 | bool children_left; | |
729 | ||
730 | switch (of_reconfig_get_state_change(action, rd)) { | |
731 | case OF_RECONFIG_CHANGE_ADD: | |
732 | /* verify that the parent is a bus */ | |
733 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) | |
734 | return NOTIFY_OK; /* not for us */ | |
735 | ||
15204ab1 PA |
736 | /* already populated? (driver using of_populate manually) */ |
737 | if (of_node_check_flag(rd->dn, OF_POPULATED)) | |
738 | return NOTIFY_OK; | |
739 | ||
1a50d940 GU |
740 | /* |
741 | * Clear the flag before adding the device so that fw_devlink | |
742 | * doesn't skip adding consumers to this device. | |
743 | */ | |
744 | rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; | |
801d728c PA |
745 | /* pdev_parent may be NULL when no bus platform device */ |
746 | pdev_parent = of_find_device_by_node(rd->dn->parent); | |
747 | pdev = of_platform_device_create(rd->dn, NULL, | |
748 | pdev_parent ? &pdev_parent->dev : NULL); | |
83c4a4ee | 749 | platform_device_put(pdev_parent); |
801d728c PA |
750 | |
751 | if (pdev == NULL) { | |
0d638a07 RH |
752 | pr_err("%s: failed to create for '%pOF'\n", |
753 | __func__, rd->dn); | |
801d728c PA |
754 | /* of_platform_device_create tosses the error code */ |
755 | return notifier_from_errno(-EINVAL); | |
756 | } | |
757 | break; | |
758 | ||
759 | case OF_RECONFIG_CHANGE_REMOVE: | |
15204ab1 PA |
760 | |
761 | /* already depopulated? */ | |
762 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
763 | return NOTIFY_OK; | |
764 | ||
801d728c PA |
765 | /* find our device by node */ |
766 | pdev = of_find_device_by_node(rd->dn); | |
767 | if (pdev == NULL) | |
768 | return NOTIFY_OK; /* no? not meant for us */ | |
769 | ||
770 | /* unregister takes one ref away */ | |
771 | of_platform_device_destroy(&pdev->dev, &children_left); | |
772 | ||
773 | /* and put the reference of the find */ | |
83c4a4ee | 774 | platform_device_put(pdev); |
801d728c PA |
775 | break; |
776 | } | |
777 | ||
778 | return NOTIFY_OK; | |
779 | } | |
780 | ||
781 | static struct notifier_block platform_of_notifier = { | |
782 | .notifier_call = of_platform_notify, | |
783 | }; | |
784 | ||
785 | void of_platform_register_reconfig_notifier(void) | |
786 | { | |
787 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); | |
788 | } | |
789 | #endif /* CONFIG_OF_DYNAMIC */ | |
790 | ||
964dba28 | 791 | #endif /* CONFIG_OF_ADDRESS */ |