Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
daa41226 | 13 | #include <linux/string.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
05212157 | 15 | #include <linux/of_device.h> |
9ec36caf | 16 | #include <linux/of_irq.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/bootmem.h> | |
21 | #include <linux/err.h> | |
4e57b681 | 22 | #include <linux/slab.h> |
9d730229 | 23 | #include <linux/pm_runtime.h> |
f48c767c | 24 | #include <linux/pm_domain.h> |
689ae231 | 25 | #include <linux/idr.h> |
91e56878 | 26 | #include <linux/acpi.h> |
86be408b | 27 | #include <linux/clk/clk-conf.h> |
3d713e0e | 28 | #include <linux/limits.h> |
1da177e4 | 29 | |
a1bdc7aa | 30 | #include "base.h" |
bed2b42d | 31 | #include "power/power.h" |
a1bdc7aa | 32 | |
689ae231 JD |
33 | /* For automatically allocated device IDs */ |
34 | static DEFINE_IDA(platform_devid_ida); | |
35 | ||
1da177e4 | 36 | struct device platform_bus = { |
1e0b2cf9 | 37 | .init_name = "platform", |
1da177e4 | 38 | }; |
a96b2042 | 39 | EXPORT_SYMBOL_GPL(platform_bus); |
1da177e4 | 40 | |
a77ce816 KG |
41 | /** |
42 | * arch_setup_pdev_archdata - Allow manipulation of archdata before its used | |
7de636fa | 43 | * @pdev: platform device |
a77ce816 KG |
44 | * |
45 | * This is called before platform_device_add() such that any pdev_archdata may | |
46 | * be setup before the platform_notifier is called. So if a user needs to | |
47 | * manipulate any relevant information in the pdev_archdata they can do: | |
48 | * | |
b1d6d822 | 49 | * platform_device_alloc() |
0258e182 FP |
50 | * ... manipulate ... |
51 | * platform_device_add() | |
a77ce816 KG |
52 | * |
53 | * And if they don't care they can just call platform_device_register() and | |
54 | * everything will just work out. | |
55 | */ | |
56 | void __weak arch_setup_pdev_archdata(struct platform_device *pdev) | |
57 | { | |
58 | } | |
59 | ||
1da177e4 | 60 | /** |
4a3ad20c GKH |
61 | * platform_get_resource - get a resource for a device |
62 | * @dev: platform device | |
63 | * @type: resource type | |
64 | * @num: resource index | |
1da177e4 | 65 | */ |
4a3ad20c GKH |
66 | struct resource *platform_get_resource(struct platform_device *dev, |
67 | unsigned int type, unsigned int num) | |
1da177e4 LT |
68 | { |
69 | int i; | |
70 | ||
71 | for (i = 0; i < dev->num_resources; i++) { | |
72 | struct resource *r = &dev->resource[i]; | |
73 | ||
c9f66169 MD |
74 | if (type == resource_type(r) && num-- == 0) |
75 | return r; | |
1da177e4 LT |
76 | } |
77 | return NULL; | |
78 | } | |
a96b2042 | 79 | EXPORT_SYMBOL_GPL(platform_get_resource); |
1da177e4 LT |
80 | |
81 | /** | |
4a3ad20c GKH |
82 | * platform_get_irq - get an IRQ for a device |
83 | * @dev: platform device | |
84 | * @num: IRQ number index | |
1da177e4 LT |
85 | */ |
86 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
87 | { | |
5cf8f7db AL |
88 | #ifdef CONFIG_SPARC |
89 | /* sparc does not have irqs represented as IORESOURCE_IRQ resources */ | |
90 | if (!dev || num >= dev->archdata.num_irqs) | |
91 | return -ENXIO; | |
92 | return dev->archdata.irqs[num]; | |
93 | #else | |
9ec36caf | 94 | struct resource *r; |
aff008ad GR |
95 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
96 | int ret; | |
97 | ||
98 | ret = of_irq_get(dev->dev.of_node, num); | |
99 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
100 | return ret; | |
101 | } | |
9ec36caf RH |
102 | |
103 | r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
7085a740 LW |
104 | /* |
105 | * The resources may pass trigger flags to the irqs that need | |
106 | * to be set up. It so happens that the trigger flags for | |
107 | * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* | |
108 | * settings. | |
109 | */ | |
110 | if (r && r->flags & IORESOURCE_BITS) | |
111 | irqd_set_trigger_type(irq_get_irq_data(r->start), | |
112 | r->flags & IORESOURCE_BITS); | |
1da177e4 | 113 | |
305b3228 | 114 | return r ? r->start : -ENXIO; |
5cf8f7db | 115 | #endif |
1da177e4 | 116 | } |
a96b2042 | 117 | EXPORT_SYMBOL_GPL(platform_get_irq); |
1da177e4 LT |
118 | |
119 | /** | |
4a3ad20c GKH |
120 | * platform_get_resource_byname - get a resource for a device by name |
121 | * @dev: platform device | |
122 | * @type: resource type | |
123 | * @name: resource name | |
1da177e4 | 124 | */ |
4a3ad20c | 125 | struct resource *platform_get_resource_byname(struct platform_device *dev, |
c0afe7ba LW |
126 | unsigned int type, |
127 | const char *name) | |
1da177e4 LT |
128 | { |
129 | int i; | |
130 | ||
131 | for (i = 0; i < dev->num_resources; i++) { | |
132 | struct resource *r = &dev->resource[i]; | |
133 | ||
1b8cb929 PU |
134 | if (unlikely(!r->name)) |
135 | continue; | |
136 | ||
c9f66169 MD |
137 | if (type == resource_type(r) && !strcmp(r->name, name)) |
138 | return r; | |
1da177e4 LT |
139 | } |
140 | return NULL; | |
141 | } | |
a96b2042 | 142 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
1da177e4 LT |
143 | |
144 | /** | |
d6ff8551 | 145 | * platform_get_irq_byname - get an IRQ for a device by name |
4a3ad20c GKH |
146 | * @dev: platform device |
147 | * @name: IRQ name | |
1da177e4 | 148 | */ |
c0afe7ba | 149 | int platform_get_irq_byname(struct platform_device *dev, const char *name) |
1da177e4 | 150 | { |
ad69674e GS |
151 | struct resource *r; |
152 | ||
aff008ad GR |
153 | if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
154 | int ret; | |
155 | ||
156 | ret = of_irq_get_byname(dev->dev.of_node, name); | |
157 | if (ret >= 0 || ret == -EPROBE_DEFER) | |
158 | return ret; | |
159 | } | |
1da177e4 | 160 | |
ad69674e | 161 | r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
305b3228 | 162 | return r ? r->start : -ENXIO; |
1da177e4 | 163 | } |
a96b2042 | 164 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
1da177e4 LT |
165 | |
166 | /** | |
4a3ad20c GKH |
167 | * platform_add_devices - add a numbers of platform devices |
168 | * @devs: array of platform devices to add | |
169 | * @num: number of platform devices in array | |
1da177e4 LT |
170 | */ |
171 | int platform_add_devices(struct platform_device **devs, int num) | |
172 | { | |
173 | int i, ret = 0; | |
174 | ||
175 | for (i = 0; i < num; i++) { | |
176 | ret = platform_device_register(devs[i]); | |
177 | if (ret) { | |
178 | while (--i >= 0) | |
179 | platform_device_unregister(devs[i]); | |
180 | break; | |
181 | } | |
182 | } | |
183 | ||
184 | return ret; | |
185 | } | |
a96b2042 | 186 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 | 187 | |
37c12e74 RK |
188 | struct platform_object { |
189 | struct platform_device pdev; | |
1cec24c5 | 190 | char name[]; |
37c12e74 RK |
191 | }; |
192 | ||
1da177e4 | 193 | /** |
3c31f07a | 194 | * platform_device_put - destroy a platform device |
4a3ad20c | 195 | * @pdev: platform device to free |
37c12e74 | 196 | * |
4a3ad20c GKH |
197 | * Free all memory associated with a platform device. This function must |
198 | * _only_ be externally called in error cases. All other usage is a bug. | |
37c12e74 RK |
199 | */ |
200 | void platform_device_put(struct platform_device *pdev) | |
201 | { | |
202 | if (pdev) | |
203 | put_device(&pdev->dev); | |
204 | } | |
205 | EXPORT_SYMBOL_GPL(platform_device_put); | |
206 | ||
207 | static void platform_device_release(struct device *dev) | |
208 | { | |
4a3ad20c GKH |
209 | struct platform_object *pa = container_of(dev, struct platform_object, |
210 | pdev.dev); | |
37c12e74 | 211 | |
7096d042 | 212 | of_device_node_put(&pa->pdev.dev); |
37c12e74 | 213 | kfree(pa->pdev.dev.platform_data); |
e710d7d5 | 214 | kfree(pa->pdev.mfd_cell); |
37c12e74 | 215 | kfree(pa->pdev.resource); |
3d713e0e | 216 | kfree(pa->pdev.driver_override); |
37c12e74 RK |
217 | kfree(pa); |
218 | } | |
219 | ||
220 | /** | |
3c31f07a | 221 | * platform_device_alloc - create a platform device |
4a3ad20c GKH |
222 | * @name: base name of the device we're adding |
223 | * @id: instance id | |
37c12e74 | 224 | * |
4a3ad20c GKH |
225 | * Create a platform device object which can have other objects attached |
226 | * to it, and which will have attached objects freed when it is released. | |
37c12e74 | 227 | */ |
1359555e | 228 | struct platform_device *platform_device_alloc(const char *name, int id) |
37c12e74 RK |
229 | { |
230 | struct platform_object *pa; | |
231 | ||
1cec24c5 | 232 | pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); |
37c12e74 RK |
233 | if (pa) { |
234 | strcpy(pa->name, name); | |
235 | pa->pdev.name = pa->name; | |
236 | pa->pdev.id = id; | |
237 | device_initialize(&pa->pdev.dev); | |
238 | pa->pdev.dev.release = platform_device_release; | |
a77ce816 | 239 | arch_setup_pdev_archdata(&pa->pdev); |
37c12e74 RK |
240 | } |
241 | ||
93ce3061 | 242 | return pa ? &pa->pdev : NULL; |
37c12e74 RK |
243 | } |
244 | EXPORT_SYMBOL_GPL(platform_device_alloc); | |
245 | ||
246 | /** | |
3c31f07a | 247 | * platform_device_add_resources - add resources to a platform device |
4a3ad20c GKH |
248 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
249 | * @res: set of resources that needs to be allocated for the device | |
250 | * @num: number of resources | |
37c12e74 | 251 | * |
4a3ad20c GKH |
252 | * Add a copy of the resources to the platform device. The memory |
253 | * associated with the resources will be freed when the platform device is | |
254 | * released. | |
37c12e74 | 255 | */ |
4a3ad20c | 256 | int platform_device_add_resources(struct platform_device *pdev, |
0b7f1a7e | 257 | const struct resource *res, unsigned int num) |
37c12e74 | 258 | { |
cea89623 | 259 | struct resource *r = NULL; |
37c12e74 | 260 | |
cea89623 UKK |
261 | if (res) { |
262 | r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); | |
263 | if (!r) | |
264 | return -ENOMEM; | |
37c12e74 | 265 | } |
cea89623 | 266 | |
4a03d6f7 | 267 | kfree(pdev->resource); |
cea89623 UKK |
268 | pdev->resource = r; |
269 | pdev->num_resources = num; | |
270 | return 0; | |
37c12e74 RK |
271 | } |
272 | EXPORT_SYMBOL_GPL(platform_device_add_resources); | |
273 | ||
274 | /** | |
3c31f07a | 275 | * platform_device_add_data - add platform-specific data to a platform device |
4a3ad20c GKH |
276 | * @pdev: platform device allocated by platform_device_alloc to add resources to |
277 | * @data: platform specific data for this platform device | |
278 | * @size: size of platform specific data | |
37c12e74 | 279 | * |
4a3ad20c GKH |
280 | * Add a copy of platform specific data to the platform device's |
281 | * platform_data pointer. The memory associated with the platform data | |
282 | * will be freed when the platform device is released. | |
37c12e74 | 283 | */ |
4a3ad20c GKH |
284 | int platform_device_add_data(struct platform_device *pdev, const void *data, |
285 | size_t size) | |
37c12e74 | 286 | { |
27a33f9e | 287 | void *d = NULL; |
5cfc64ce | 288 | |
27a33f9e UKK |
289 | if (data) { |
290 | d = kmemdup(data, size, GFP_KERNEL); | |
291 | if (!d) | |
292 | return -ENOMEM; | |
37c12e74 | 293 | } |
27a33f9e | 294 | |
251e031d | 295 | kfree(pdev->dev.platform_data); |
27a33f9e UKK |
296 | pdev->dev.platform_data = d; |
297 | return 0; | |
37c12e74 RK |
298 | } |
299 | EXPORT_SYMBOL_GPL(platform_device_add_data); | |
300 | ||
301 | /** | |
4a3ad20c GKH |
302 | * platform_device_add - add a platform device to device hierarchy |
303 | * @pdev: platform device we're adding | |
1da177e4 | 304 | * |
4a3ad20c GKH |
305 | * This is part 2 of platform_device_register(), though may be called |
306 | * separately _iff_ pdev was allocated by platform_device_alloc(). | |
1da177e4 | 307 | */ |
37c12e74 | 308 | int platform_device_add(struct platform_device *pdev) |
1da177e4 | 309 | { |
689ae231 | 310 | int i, ret; |
1da177e4 LT |
311 | |
312 | if (!pdev) | |
313 | return -EINVAL; | |
314 | ||
315 | if (!pdev->dev.parent) | |
316 | pdev->dev.parent = &platform_bus; | |
317 | ||
318 | pdev->dev.bus = &platform_bus_type; | |
319 | ||
689ae231 JD |
320 | switch (pdev->id) { |
321 | default: | |
1e0b2cf9 | 322 | dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
689ae231 JD |
323 | break; |
324 | case PLATFORM_DEVID_NONE: | |
acc0e90f | 325 | dev_set_name(&pdev->dev, "%s", pdev->name); |
689ae231 JD |
326 | break; |
327 | case PLATFORM_DEVID_AUTO: | |
328 | /* | |
329 | * Automatically allocated device ID. We mark it as such so | |
330 | * that we remember it must be freed, and we append a suffix | |
331 | * to avoid namespace collision with explicit IDs. | |
332 | */ | |
333 | ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); | |
334 | if (ret < 0) | |
5da7f709 | 335 | goto err_out; |
689ae231 JD |
336 | pdev->id = ret; |
337 | pdev->id_auto = true; | |
338 | dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); | |
339 | break; | |
340 | } | |
1da177e4 LT |
341 | |
342 | for (i = 0; i < pdev->num_resources; i++) { | |
5da7f709 | 343 | struct resource *p, *r = &pdev->resource[i]; |
1da177e4 LT |
344 | |
345 | if (r->name == NULL) | |
1e0b2cf9 | 346 | r->name = dev_name(&pdev->dev); |
1da177e4 LT |
347 | |
348 | p = r->parent; | |
349 | if (!p) { | |
0e6c861f | 350 | if (resource_type(r) == IORESOURCE_MEM) |
1da177e4 | 351 | p = &iomem_resource; |
0e6c861f | 352 | else if (resource_type(r) == IORESOURCE_IO) |
1da177e4 LT |
353 | p = &ioport_resource; |
354 | } | |
355 | ||
0e6c861f | 356 | if (p && insert_resource(p, r)) { |
5da7f709 GKH |
357 | dev_err(&pdev->dev, "failed to claim resource %d\n", i); |
358 | ret = -EBUSY; | |
359 | goto failed; | |
360 | } | |
1da177e4 LT |
361 | } |
362 | ||
363 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
1e0b2cf9 | 364 | dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
1da177e4 | 365 | |
e3915532 | 366 | ret = device_add(&pdev->dev); |
8b2dceba GKH |
367 | if (ret == 0) |
368 | return ret; | |
369 | ||
5da7f709 | 370 | failed: |
8b2dceba GKH |
371 | if (pdev->id_auto) { |
372 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
373 | pdev->id = PLATFORM_DEVID_AUTO; | |
374 | } | |
375 | ||
376 | while (--i >= 0) { | |
377 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 378 | if (r->parent) |
8b2dceba GKH |
379 | release_resource(r); |
380 | } | |
c9f66169 | 381 | |
5da7f709 | 382 | err_out: |
1da177e4 LT |
383 | return ret; |
384 | } | |
37c12e74 RK |
385 | EXPORT_SYMBOL_GPL(platform_device_add); |
386 | ||
387 | /** | |
4a3ad20c GKH |
388 | * platform_device_del - remove a platform-level device |
389 | * @pdev: platform device we're removing | |
1da177e4 | 390 | * |
4a3ad20c GKH |
391 | * Note that this function will also release all memory- and port-based |
392 | * resources owned by the device (@dev->resource). This function must | |
393 | * _only_ be externally called in error cases. All other usage is a bug. | |
1da177e4 | 394 | */ |
93ce3061 | 395 | void platform_device_del(struct platform_device *pdev) |
1da177e4 | 396 | { |
8b2dceba | 397 | int i; |
c9f66169 | 398 | |
8b2dceba GKH |
399 | if (pdev) { |
400 | device_del(&pdev->dev); | |
401 | ||
402 | if (pdev->id_auto) { | |
403 | ida_simple_remove(&platform_devid_ida, pdev->id); | |
404 | pdev->id = PLATFORM_DEVID_AUTO; | |
405 | } | |
406 | ||
407 | for (i = 0; i < pdev->num_resources; i++) { | |
408 | struct resource *r = &pdev->resource[i]; | |
7f5dcaf1 | 409 | if (r->parent) |
8b2dceba GKH |
410 | release_resource(r); |
411 | } | |
412 | } | |
1da177e4 | 413 | } |
93ce3061 DT |
414 | EXPORT_SYMBOL_GPL(platform_device_del); |
415 | ||
416 | /** | |
4a3ad20c GKH |
417 | * platform_device_register - add a platform-level device |
418 | * @pdev: platform device we're adding | |
93ce3061 | 419 | */ |
4a3ad20c | 420 | int platform_device_register(struct platform_device *pdev) |
93ce3061 DT |
421 | { |
422 | device_initialize(&pdev->dev); | |
a77ce816 | 423 | arch_setup_pdev_archdata(pdev); |
93ce3061 DT |
424 | return platform_device_add(pdev); |
425 | } | |
a96b2042 | 426 | EXPORT_SYMBOL_GPL(platform_device_register); |
93ce3061 DT |
427 | |
428 | /** | |
4a3ad20c GKH |
429 | * platform_device_unregister - unregister a platform-level device |
430 | * @pdev: platform device we're unregistering | |
93ce3061 | 431 | * |
4a3ad20c GKH |
432 | * Unregistration is done in 2 steps. First we release all resources |
433 | * and remove it from the subsystem, then we drop reference count by | |
434 | * calling platform_device_put(). | |
93ce3061 | 435 | */ |
4a3ad20c | 436 | void platform_device_unregister(struct platform_device *pdev) |
93ce3061 DT |
437 | { |
438 | platform_device_del(pdev); | |
439 | platform_device_put(pdev); | |
440 | } | |
a96b2042 | 441 | EXPORT_SYMBOL_GPL(platform_device_unregister); |
1da177e4 | 442 | |
1da177e4 | 443 | /** |
01dcc60a | 444 | * platform_device_register_full - add a platform-level device with |
44f28bde | 445 | * resources and platform-specific data |
49a4ec18 | 446 | * |
01dcc60a | 447 | * @pdevinfo: data used to create device |
d8bf2540 | 448 | * |
f0eae0ed | 449 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
d8bf2540 | 450 | */ |
01dcc60a | 451 | struct platform_device *platform_device_register_full( |
5a3072be | 452 | const struct platform_device_info *pdevinfo) |
d8bf2540 | 453 | { |
44f28bde | 454 | int ret = -ENOMEM; |
d8bf2540 | 455 | struct platform_device *pdev; |
d8bf2540 | 456 | |
01dcc60a | 457 | pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
44f28bde | 458 | if (!pdev) |
01dcc60a UKK |
459 | goto err_alloc; |
460 | ||
461 | pdev->dev.parent = pdevinfo->parent; | |
ce793486 | 462 | pdev->dev.fwnode = pdevinfo->fwnode; |
01dcc60a UKK |
463 | |
464 | if (pdevinfo->dma_mask) { | |
465 | /* | |
466 | * This memory isn't freed when the device is put, | |
467 | * I don't have a nice idea for that though. Conceptually | |
468 | * dma_mask in struct device should not be a pointer. | |
469 | * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 | |
470 | */ | |
471 | pdev->dev.dma_mask = | |
472 | kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
473 | if (!pdev->dev.dma_mask) | |
474 | goto err; | |
475 | ||
476 | *pdev->dev.dma_mask = pdevinfo->dma_mask; | |
477 | pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; | |
478 | } | |
d8bf2540 | 479 | |
01dcc60a UKK |
480 | ret = platform_device_add_resources(pdev, |
481 | pdevinfo->res, pdevinfo->num_res); | |
807508c8 AV |
482 | if (ret) |
483 | goto err; | |
44f28bde | 484 | |
01dcc60a UKK |
485 | ret = platform_device_add_data(pdev, |
486 | pdevinfo->data, pdevinfo->size_data); | |
807508c8 AV |
487 | if (ret) |
488 | goto err; | |
d8bf2540 | 489 | |
44f28bde UKK |
490 | ret = platform_device_add(pdev); |
491 | if (ret) { | |
492 | err: | |
7b199811 | 493 | ACPI_COMPANION_SET(&pdev->dev, NULL); |
01dcc60a UKK |
494 | kfree(pdev->dev.dma_mask); |
495 | ||
496 | err_alloc: | |
44f28bde UKK |
497 | platform_device_put(pdev); |
498 | return ERR_PTR(ret); | |
499 | } | |
d8bf2540 DB |
500 | |
501 | return pdev; | |
d8bf2540 | 502 | } |
01dcc60a | 503 | EXPORT_SYMBOL_GPL(platform_device_register_full); |
d8bf2540 | 504 | |
00d3dcdd RK |
505 | static int platform_drv_probe(struct device *_dev) |
506 | { | |
507 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
508 | struct platform_device *dev = to_platform_device(_dev); | |
94d76d5d | 509 | int ret; |
00d3dcdd | 510 | |
86be408b SN |
511 | ret = of_clk_set_defaults(_dev->of_node, false); |
512 | if (ret < 0) | |
513 | return ret; | |
514 | ||
cb518413 | 515 | ret = dev_pm_domain_attach(_dev, true); |
b8b2c7d8 | 516 | if (ret != -EPROBE_DEFER && drv->probe) { |
cb518413 UH |
517 | ret = drv->probe(dev); |
518 | if (ret) | |
519 | dev_pm_domain_detach(_dev, true); | |
520 | } | |
94d76d5d | 521 | |
3f9120b0 JH |
522 | if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
523 | dev_warn(_dev, "probe deferral not supported\n"); | |
524 | ret = -ENXIO; | |
525 | } | |
526 | ||
94d76d5d | 527 | return ret; |
00d3dcdd RK |
528 | } |
529 | ||
c67334fb DB |
530 | static int platform_drv_probe_fail(struct device *_dev) |
531 | { | |
532 | return -ENXIO; | |
533 | } | |
534 | ||
00d3dcdd RK |
535 | static int platform_drv_remove(struct device *_dev) |
536 | { | |
537 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
538 | struct platform_device *dev = to_platform_device(_dev); | |
b8b2c7d8 | 539 | int ret = 0; |
00d3dcdd | 540 | |
b8b2c7d8 UKK |
541 | if (drv->remove) |
542 | ret = drv->remove(dev); | |
cb518413 | 543 | dev_pm_domain_detach(_dev, true); |
94d76d5d RW |
544 | |
545 | return ret; | |
00d3dcdd RK |
546 | } |
547 | ||
548 | static void platform_drv_shutdown(struct device *_dev) | |
549 | { | |
550 | struct platform_driver *drv = to_platform_driver(_dev->driver); | |
551 | struct platform_device *dev = to_platform_device(_dev); | |
552 | ||
b8b2c7d8 UKK |
553 | if (drv->shutdown) |
554 | drv->shutdown(dev); | |
cb518413 | 555 | dev_pm_domain_detach(_dev, true); |
00d3dcdd RK |
556 | } |
557 | ||
00d3dcdd | 558 | /** |
9447057e | 559 | * __platform_driver_register - register a driver for platform-level devices |
4a3ad20c | 560 | * @drv: platform driver structure |
08801f96 | 561 | * @owner: owning module/driver |
00d3dcdd | 562 | */ |
9447057e LC |
563 | int __platform_driver_register(struct platform_driver *drv, |
564 | struct module *owner) | |
00d3dcdd | 565 | { |
9447057e | 566 | drv->driver.owner = owner; |
00d3dcdd | 567 | drv->driver.bus = &platform_bus_type; |
b8b2c7d8 UKK |
568 | drv->driver.probe = platform_drv_probe; |
569 | drv->driver.remove = platform_drv_remove; | |
570 | drv->driver.shutdown = platform_drv_shutdown; | |
783ea7d4 | 571 | |
00d3dcdd RK |
572 | return driver_register(&drv->driver); |
573 | } | |
9447057e | 574 | EXPORT_SYMBOL_GPL(__platform_driver_register); |
00d3dcdd RK |
575 | |
576 | /** | |
3c31f07a | 577 | * platform_driver_unregister - unregister a driver for platform-level devices |
4a3ad20c | 578 | * @drv: platform driver structure |
00d3dcdd RK |
579 | */ |
580 | void platform_driver_unregister(struct platform_driver *drv) | |
581 | { | |
582 | driver_unregister(&drv->driver); | |
583 | } | |
584 | EXPORT_SYMBOL_GPL(platform_driver_unregister); | |
585 | ||
c67334fb | 586 | /** |
c3b50dc2 | 587 | * __platform_driver_probe - register driver for non-hotpluggable device |
c67334fb | 588 | * @drv: platform driver structure |
3f9120b0 | 589 | * @probe: the driver probe routine, probably from an __init section |
c3b50dc2 | 590 | * @module: module which will be the owner of the driver |
c67334fb DB |
591 | * |
592 | * Use this instead of platform_driver_register() when you know the device | |
593 | * is not hotpluggable and has already been registered, and you want to | |
594 | * remove its run-once probe() infrastructure from memory after the driver | |
595 | * has bound to the device. | |
596 | * | |
597 | * One typical use for this would be with drivers for controllers integrated | |
598 | * into system-on-chip processors, where the controller devices have been | |
599 | * configured as part of board setup. | |
600 | * | |
3f9120b0 | 601 | * Note that this is incompatible with deferred probing. |
647c86d0 | 602 | * |
c67334fb DB |
603 | * Returns zero if the driver registered and bound to a device, else returns |
604 | * a negative error code and with the driver not registered. | |
605 | */ | |
c3b50dc2 WS |
606 | int __init_or_module __platform_driver_probe(struct platform_driver *drv, |
607 | int (*probe)(struct platform_device *), struct module *module) | |
c67334fb DB |
608 | { |
609 | int retval, code; | |
610 | ||
5c36eb2a DT |
611 | if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
612 | pr_err("%s: drivers registered with %s can not be probed asynchronously\n", | |
613 | drv->driver.name, __func__); | |
614 | return -EINVAL; | |
615 | } | |
616 | ||
617 | /* | |
618 | * We have to run our probes synchronously because we check if | |
619 | * we find any devices to bind to and exit with error if there | |
620 | * are any. | |
621 | */ | |
622 | drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; | |
623 | ||
3f9120b0 JH |
624 | /* |
625 | * Prevent driver from requesting probe deferral to avoid further | |
626 | * futile probe attempts. | |
627 | */ | |
628 | drv->prevent_deferred_probe = true; | |
629 | ||
1a6f2a75 DT |
630 | /* make sure driver won't have bind/unbind attributes */ |
631 | drv->driver.suppress_bind_attrs = true; | |
632 | ||
c67334fb DB |
633 | /* temporary section violation during probe() */ |
634 | drv->probe = probe; | |
c3b50dc2 | 635 | retval = code = __platform_driver_register(drv, module); |
c67334fb | 636 | |
1a6f2a75 DT |
637 | /* |
638 | * Fixup that section violation, being paranoid about code scanning | |
c67334fb DB |
639 | * the list of drivers in order to probe new devices. Check to see |
640 | * if the probe was successful, and make sure any forced probes of | |
641 | * new devices fail. | |
642 | */ | |
d79d3244 | 643 | spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb | 644 | drv->probe = NULL; |
e5dd1278 | 645 | if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
c67334fb DB |
646 | retval = -ENODEV; |
647 | drv->driver.probe = platform_drv_probe_fail; | |
d79d3244 | 648 | spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
c67334fb DB |
649 | |
650 | if (code != retval) | |
651 | platform_driver_unregister(drv); | |
652 | return retval; | |
653 | } | |
c3b50dc2 | 654 | EXPORT_SYMBOL_GPL(__platform_driver_probe); |
1da177e4 | 655 | |
ecdf6ceb | 656 | /** |
291f653a | 657 | * __platform_create_bundle - register driver and create corresponding device |
ecdf6ceb DT |
658 | * @driver: platform driver structure |
659 | * @probe: the driver probe routine, probably from an __init section | |
660 | * @res: set of resources that needs to be allocated for the device | |
661 | * @n_res: number of resources | |
662 | * @data: platform specific data for this platform device | |
663 | * @size: size of platform specific data | |
291f653a | 664 | * @module: module which will be the owner of the driver |
ecdf6ceb DT |
665 | * |
666 | * Use this in legacy-style modules that probe hardware directly and | |
667 | * register a single platform device and corresponding platform driver. | |
f0eae0ed JN |
668 | * |
669 | * Returns &struct platform_device pointer on success, or ERR_PTR() on error. | |
ecdf6ceb | 670 | */ |
291f653a | 671 | struct platform_device * __init_or_module __platform_create_bundle( |
ecdf6ceb DT |
672 | struct platform_driver *driver, |
673 | int (*probe)(struct platform_device *), | |
674 | struct resource *res, unsigned int n_res, | |
291f653a | 675 | const void *data, size_t size, struct module *module) |
ecdf6ceb DT |
676 | { |
677 | struct platform_device *pdev; | |
678 | int error; | |
679 | ||
680 | pdev = platform_device_alloc(driver->driver.name, -1); | |
681 | if (!pdev) { | |
682 | error = -ENOMEM; | |
683 | goto err_out; | |
684 | } | |
685 | ||
807508c8 AV |
686 | error = platform_device_add_resources(pdev, res, n_res); |
687 | if (error) | |
688 | goto err_pdev_put; | |
ecdf6ceb | 689 | |
807508c8 AV |
690 | error = platform_device_add_data(pdev, data, size); |
691 | if (error) | |
692 | goto err_pdev_put; | |
ecdf6ceb DT |
693 | |
694 | error = platform_device_add(pdev); | |
695 | if (error) | |
696 | goto err_pdev_put; | |
697 | ||
291f653a | 698 | error = __platform_driver_probe(driver, probe, module); |
ecdf6ceb DT |
699 | if (error) |
700 | goto err_pdev_del; | |
701 | ||
702 | return pdev; | |
703 | ||
704 | err_pdev_del: | |
705 | platform_device_del(pdev); | |
706 | err_pdev_put: | |
707 | platform_device_put(pdev); | |
708 | err_out: | |
709 | return ERR_PTR(error); | |
710 | } | |
291f653a | 711 | EXPORT_SYMBOL_GPL(__platform_create_bundle); |
ecdf6ceb | 712 | |
a0245f7a DB |
713 | /* modalias support enables more hands-off userspace setup: |
714 | * (a) environment variable lets new-style hotplug events work once system is | |
715 | * fully running: "modprobe $MODALIAS" | |
716 | * (b) sysfs attribute lets new-style coldplug recover from hotplug events | |
717 | * mishandled before system is fully running: "modprobe $(cat modalias)" | |
718 | */ | |
4a3ad20c GKH |
719 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
720 | char *buf) | |
a0245f7a DB |
721 | { |
722 | struct platform_device *pdev = to_platform_device(dev); | |
8c4ff6d0 ZR |
723 | int len; |
724 | ||
b9f73067 ZR |
725 | len = of_device_get_modalias(dev, buf, PAGE_SIZE -1); |
726 | if (len != -ENODEV) | |
727 | return len; | |
728 | ||
8c4ff6d0 ZR |
729 | len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); |
730 | if (len != -ENODEV) | |
731 | return len; | |
732 | ||
733 | len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); | |
a0245f7a DB |
734 | |
735 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
736 | } | |
d06262e5 | 737 | static DEVICE_ATTR_RO(modalias); |
a0245f7a | 738 | |
3d713e0e KP |
739 | static ssize_t driver_override_store(struct device *dev, |
740 | struct device_attribute *attr, | |
741 | const char *buf, size_t count) | |
742 | { | |
743 | struct platform_device *pdev = to_platform_device(dev); | |
744 | char *driver_override, *old = pdev->driver_override, *cp; | |
745 | ||
746 | if (count > PATH_MAX) | |
747 | return -EINVAL; | |
748 | ||
749 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
750 | if (!driver_override) | |
751 | return -ENOMEM; | |
752 | ||
753 | cp = strchr(driver_override, '\n'); | |
754 | if (cp) | |
755 | *cp = '\0'; | |
756 | ||
757 | if (strlen(driver_override)) { | |
758 | pdev->driver_override = driver_override; | |
759 | } else { | |
760 | kfree(driver_override); | |
761 | pdev->driver_override = NULL; | |
762 | } | |
763 | ||
764 | kfree(old); | |
765 | ||
766 | return count; | |
767 | } | |
768 | ||
769 | static ssize_t driver_override_show(struct device *dev, | |
770 | struct device_attribute *attr, char *buf) | |
771 | { | |
772 | struct platform_device *pdev = to_platform_device(dev); | |
773 | ||
774 | return sprintf(buf, "%s\n", pdev->driver_override); | |
775 | } | |
776 | static DEVICE_ATTR_RW(driver_override); | |
777 | ||
778 | ||
d06262e5 GKH |
779 | static struct attribute *platform_dev_attrs[] = { |
780 | &dev_attr_modalias.attr, | |
3d713e0e | 781 | &dev_attr_driver_override.attr, |
d06262e5 | 782 | NULL, |
a0245f7a | 783 | }; |
d06262e5 | 784 | ATTRIBUTE_GROUPS(platform_dev); |
a0245f7a | 785 | |
7eff2e7a | 786 | static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7a DB |
787 | { |
788 | struct platform_device *pdev = to_platform_device(dev); | |
eca39301 GL |
789 | int rc; |
790 | ||
791 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
0258e182 | 792 | rc = of_device_uevent_modalias(dev, env); |
eca39301 GL |
793 | if (rc != -ENODEV) |
794 | return rc; | |
a0245f7a | 795 | |
8c4ff6d0 ZR |
796 | rc = acpi_device_uevent_modalias(dev, env); |
797 | if (rc != -ENODEV) | |
798 | return rc; | |
799 | ||
57fee4a5 | 800 | add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c | 801 | pdev->name); |
a0245f7a DB |
802 | return 0; |
803 | } | |
804 | ||
57fee4a5 | 805 | static const struct platform_device_id *platform_match_id( |
831fad2f | 806 | const struct platform_device_id *id, |
57fee4a5 EM |
807 | struct platform_device *pdev) |
808 | { | |
809 | while (id->name[0]) { | |
810 | if (strcmp(pdev->name, id->name) == 0) { | |
811 | pdev->id_entry = id; | |
812 | return id; | |
813 | } | |
814 | id++; | |
815 | } | |
816 | return NULL; | |
817 | } | |
818 | ||
1da177e4 | 819 | /** |
4a3ad20c GKH |
820 | * platform_match - bind platform device to platform driver. |
821 | * @dev: device. | |
822 | * @drv: driver. | |
1da177e4 | 823 | * |
4a3ad20c GKH |
824 | * Platform device IDs are assumed to be encoded like this: |
825 | * "<name><instance>", where <name> is a short description of the type of | |
826 | * device, like "pci" or "floppy", and <instance> is the enumerated | |
827 | * instance of the device, like '0' or '42'. Driver IDs are simply | |
828 | * "<name>". So, extract the <name> from the platform_device structure, | |
829 | * and compare it against the name of the driver. Return whether they match | |
830 | * or not. | |
1da177e4 | 831 | */ |
4a3ad20c | 832 | static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 833 | { |
71b3e0c1 | 834 | struct platform_device *pdev = to_platform_device(dev); |
57fee4a5 EM |
835 | struct platform_driver *pdrv = to_platform_driver(drv); |
836 | ||
3d713e0e KP |
837 | /* When driver_override is set, only bind to the matching driver */ |
838 | if (pdev->driver_override) | |
839 | return !strcmp(pdev->driver_override, drv->name); | |
840 | ||
05212157 GL |
841 | /* Attempt an OF style match first */ |
842 | if (of_driver_match_device(dev, drv)) | |
843 | return 1; | |
844 | ||
91e56878 MW |
845 | /* Then try ACPI style match */ |
846 | if (acpi_driver_match_device(dev, drv)) | |
847 | return 1; | |
848 | ||
05212157 | 849 | /* Then try to match against the id table */ |
57fee4a5 EM |
850 | if (pdrv->id_table) |
851 | return platform_match_id(pdrv->id_table, pdev) != NULL; | |
1da177e4 | 852 | |
57fee4a5 | 853 | /* fall-back to driver name match */ |
1e0b2cf9 | 854 | return (strcmp(pdev->name, drv->name) == 0); |
1da177e4 LT |
855 | } |
856 | ||
25e18499 RW |
857 | #ifdef CONFIG_PM_SLEEP |
858 | ||
859 | static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) | |
1da177e4 | 860 | { |
783ea7d4 MD |
861 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
862 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
863 | int ret = 0; |
864 | ||
783ea7d4 MD |
865 | if (dev->driver && pdrv->suspend) |
866 | ret = pdrv->suspend(pdev, mesg); | |
386415d8 DB |
867 | |
868 | return ret; | |
869 | } | |
870 | ||
25e18499 | 871 | static int platform_legacy_resume(struct device *dev) |
1da177e4 | 872 | { |
783ea7d4 MD |
873 | struct platform_driver *pdrv = to_platform_driver(dev->driver); |
874 | struct platform_device *pdev = to_platform_device(dev); | |
1da177e4 LT |
875 | int ret = 0; |
876 | ||
783ea7d4 MD |
877 | if (dev->driver && pdrv->resume) |
878 | ret = pdrv->resume(pdev); | |
9480e307 | 879 | |
1da177e4 LT |
880 | return ret; |
881 | } | |
882 | ||
69c9dd1e | 883 | #endif /* CONFIG_PM_SLEEP */ |
9d730229 | 884 | |
25e18499 RW |
885 | #ifdef CONFIG_SUSPEND |
886 | ||
69c9dd1e | 887 | int platform_pm_suspend(struct device *dev) |
25e18499 RW |
888 | { |
889 | struct device_driver *drv = dev->driver; | |
890 | int ret = 0; | |
891 | ||
adf09493 RW |
892 | if (!drv) |
893 | return 0; | |
894 | ||
895 | if (drv->pm) { | |
25e18499 RW |
896 | if (drv->pm->suspend) |
897 | ret = drv->pm->suspend(dev); | |
898 | } else { | |
899 | ret = platform_legacy_suspend(dev, PMSG_SUSPEND); | |
900 | } | |
901 | ||
902 | return ret; | |
903 | } | |
904 | ||
69c9dd1e | 905 | int platform_pm_resume(struct device *dev) |
25e18499 RW |
906 | { |
907 | struct device_driver *drv = dev->driver; | |
908 | int ret = 0; | |
909 | ||
adf09493 RW |
910 | if (!drv) |
911 | return 0; | |
912 | ||
913 | if (drv->pm) { | |
25e18499 RW |
914 | if (drv->pm->resume) |
915 | ret = drv->pm->resume(dev); | |
916 | } else { | |
917 | ret = platform_legacy_resume(dev); | |
918 | } | |
919 | ||
920 | return ret; | |
921 | } | |
922 | ||
69c9dd1e | 923 | #endif /* CONFIG_SUSPEND */ |
25e18499 | 924 | |
1f112cee | 925 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499 | 926 | |
69c9dd1e | 927 | int platform_pm_freeze(struct device *dev) |
25e18499 RW |
928 | { |
929 | struct device_driver *drv = dev->driver; | |
930 | int ret = 0; | |
931 | ||
932 | if (!drv) | |
933 | return 0; | |
934 | ||
935 | if (drv->pm) { | |
936 | if (drv->pm->freeze) | |
937 | ret = drv->pm->freeze(dev); | |
938 | } else { | |
939 | ret = platform_legacy_suspend(dev, PMSG_FREEZE); | |
940 | } | |
941 | ||
942 | return ret; | |
943 | } | |
944 | ||
69c9dd1e | 945 | int platform_pm_thaw(struct device *dev) |
25e18499 RW |
946 | { |
947 | struct device_driver *drv = dev->driver; | |
948 | int ret = 0; | |
949 | ||
adf09493 RW |
950 | if (!drv) |
951 | return 0; | |
952 | ||
953 | if (drv->pm) { | |
25e18499 RW |
954 | if (drv->pm->thaw) |
955 | ret = drv->pm->thaw(dev); | |
956 | } else { | |
957 | ret = platform_legacy_resume(dev); | |
958 | } | |
959 | ||
960 | return ret; | |
961 | } | |
962 | ||
69c9dd1e | 963 | int platform_pm_poweroff(struct device *dev) |
25e18499 RW |
964 | { |
965 | struct device_driver *drv = dev->driver; | |
966 | int ret = 0; | |
967 | ||
adf09493 RW |
968 | if (!drv) |
969 | return 0; | |
970 | ||
971 | if (drv->pm) { | |
25e18499 RW |
972 | if (drv->pm->poweroff) |
973 | ret = drv->pm->poweroff(dev); | |
974 | } else { | |
975 | ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); | |
976 | } | |
977 | ||
978 | return ret; | |
979 | } | |
980 | ||
69c9dd1e | 981 | int platform_pm_restore(struct device *dev) |
25e18499 RW |
982 | { |
983 | struct device_driver *drv = dev->driver; | |
984 | int ret = 0; | |
985 | ||
adf09493 RW |
986 | if (!drv) |
987 | return 0; | |
988 | ||
989 | if (drv->pm) { | |
25e18499 RW |
990 | if (drv->pm->restore) |
991 | ret = drv->pm->restore(dev); | |
992 | } else { | |
993 | ret = platform_legacy_resume(dev); | |
994 | } | |
995 | ||
996 | return ret; | |
997 | } | |
998 | ||
69c9dd1e | 999 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499 | 1000 | |
d9ab7716 | 1001 | static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38 RW |
1002 | .runtime_suspend = pm_generic_runtime_suspend, |
1003 | .runtime_resume = pm_generic_runtime_resume, | |
69c9dd1e | 1004 | USE_PLATFORM_PM_SLEEP_OPS |
25e18499 RW |
1005 | }; |
1006 | ||
1da177e4 LT |
1007 | struct bus_type platform_bus_type = { |
1008 | .name = "platform", | |
d06262e5 | 1009 | .dev_groups = platform_dev_groups, |
1da177e4 | 1010 | .match = platform_match, |
a0245f7a | 1011 | .uevent = platform_uevent, |
9d730229 | 1012 | .pm = &platform_dev_pm_ops, |
1da177e4 | 1013 | }; |
a96b2042 | 1014 | EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4 LT |
1015 | |
1016 | int __init platform_bus_init(void) | |
1017 | { | |
fbfb1445 CH |
1018 | int error; |
1019 | ||
13977091 MD |
1020 | early_platform_cleanup(); |
1021 | ||
fbfb1445 CH |
1022 | error = device_register(&platform_bus); |
1023 | if (error) | |
1024 | return error; | |
1025 | error = bus_register(&platform_bus_type); | |
1026 | if (error) | |
1027 | device_unregister(&platform_bus); | |
801d728c | 1028 | of_platform_register_reconfig_notifier(); |
fbfb1445 | 1029 | return error; |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
1033 | u64 dma_get_required_mask(struct device *dev) | |
1034 | { | |
1035 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
1036 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
1037 | u64 mask; | |
1038 | ||
1039 | if (!high_totalram) { | |
1040 | /* convert to mask just covering totalram */ | |
1041 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
1042 | low_totalram += low_totalram - 1; | |
1043 | mask = low_totalram; | |
1044 | } else { | |
1045 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
1046 | high_totalram += high_totalram - 1; | |
1047 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
1048 | } | |
e88a0c2c | 1049 | return mask; |
1da177e4 LT |
1050 | } |
1051 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
1052 | #endif | |
13977091 MD |
1053 | |
1054 | static __initdata LIST_HEAD(early_platform_driver_list); | |
1055 | static __initdata LIST_HEAD(early_platform_device_list); | |
1056 | ||
1057 | /** | |
4d26e139 | 1058 | * early_platform_driver_register - register early platform driver |
d86c1302 | 1059 | * @epdrv: early_platform driver structure |
13977091 | 1060 | * @buf: string passed from early_param() |
4d26e139 MD |
1061 | * |
1062 | * Helper function for early_platform_init() / early_platform_init_buffer() | |
13977091 MD |
1063 | */ |
1064 | int __init early_platform_driver_register(struct early_platform_driver *epdrv, | |
1065 | char *buf) | |
1066 | { | |
c60e0504 | 1067 | char *tmp; |
13977091 MD |
1068 | int n; |
1069 | ||
1070 | /* Simply add the driver to the end of the global list. | |
1071 | * Drivers will by default be put on the list in compiled-in order. | |
1072 | */ | |
1073 | if (!epdrv->list.next) { | |
1074 | INIT_LIST_HEAD(&epdrv->list); | |
1075 | list_add_tail(&epdrv->list, &early_platform_driver_list); | |
1076 | } | |
1077 | ||
1078 | /* If the user has specified device then make sure the driver | |
1079 | * gets prioritized. The driver of the last device specified on | |
1080 | * command line will be put first on the list. | |
1081 | */ | |
1082 | n = strlen(epdrv->pdrv->driver.name); | |
1083 | if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { | |
1084 | list_move(&epdrv->list, &early_platform_driver_list); | |
1085 | ||
c60e0504 MD |
1086 | /* Allow passing parameters after device name */ |
1087 | if (buf[n] == '\0' || buf[n] == ',') | |
13977091 | 1088 | epdrv->requested_id = -1; |
c60e0504 MD |
1089 | else { |
1090 | epdrv->requested_id = simple_strtoul(&buf[n + 1], | |
1091 | &tmp, 10); | |
1092 | ||
1093 | if (buf[n] != '.' || (tmp == &buf[n + 1])) { | |
1094 | epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; | |
1095 | n = 0; | |
1096 | } else | |
1097 | n += strcspn(&buf[n + 1], ",") + 1; | |
1098 | } | |
1099 | ||
1100 | if (buf[n] == ',') | |
1101 | n++; | |
1102 | ||
1103 | if (epdrv->bufsize) { | |
1104 | memcpy(epdrv->buffer, &buf[n], | |
1105 | min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); | |
1106 | epdrv->buffer[epdrv->bufsize - 1] = '\0'; | |
1107 | } | |
13977091 MD |
1108 | } |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | /** | |
4d26e139 | 1114 | * early_platform_add_devices - adds a number of early platform devices |
13977091 MD |
1115 | * @devs: array of early platform devices to add |
1116 | * @num: number of early platform devices in array | |
4d26e139 MD |
1117 | * |
1118 | * Used by early architecture code to register early platform devices and | |
1119 | * their platform data. | |
13977091 MD |
1120 | */ |
1121 | void __init early_platform_add_devices(struct platform_device **devs, int num) | |
1122 | { | |
1123 | struct device *dev; | |
1124 | int i; | |
1125 | ||
1126 | /* simply add the devices to list */ | |
1127 | for (i = 0; i < num; i++) { | |
1128 | dev = &devs[i]->dev; | |
1129 | ||
1130 | if (!dev->devres_head.next) { | |
bed2b42d | 1131 | pm_runtime_early_init(dev); |
13977091 MD |
1132 | INIT_LIST_HEAD(&dev->devres_head); |
1133 | list_add_tail(&dev->devres_head, | |
1134 | &early_platform_device_list); | |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | /** | |
4d26e139 | 1140 | * early_platform_driver_register_all - register early platform drivers |
13977091 | 1141 | * @class_str: string to identify early platform driver class |
4d26e139 MD |
1142 | * |
1143 | * Used by architecture code to register all early platform drivers | |
1144 | * for a certain class. If omitted then only early platform drivers | |
1145 | * with matching kernel command line class parameters will be registered. | |
13977091 MD |
1146 | */ |
1147 | void __init early_platform_driver_register_all(char *class_str) | |
1148 | { | |
1149 | /* The "class_str" parameter may or may not be present on the kernel | |
1150 | * command line. If it is present then there may be more than one | |
1151 | * matching parameter. | |
1152 | * | |
1153 | * Since we register our early platform drivers using early_param() | |
1154 | * we need to make sure that they also get registered in the case | |
1155 | * when the parameter is missing from the kernel command line. | |
1156 | * | |
1157 | * We use parse_early_options() to make sure the early_param() gets | |
1158 | * called at least once. The early_param() may be called more than | |
1159 | * once since the name of the preferred device may be specified on | |
1160 | * the kernel command line. early_platform_driver_register() handles | |
1161 | * this case for us. | |
1162 | */ | |
1163 | parse_early_options(class_str); | |
1164 | } | |
1165 | ||
1166 | /** | |
4d26e139 | 1167 | * early_platform_match - find early platform device matching driver |
d86c1302 | 1168 | * @epdrv: early platform driver structure |
13977091 MD |
1169 | * @id: id to match against |
1170 | */ | |
a8257910 | 1171 | static struct platform_device * __init |
13977091 MD |
1172 | early_platform_match(struct early_platform_driver *epdrv, int id) |
1173 | { | |
1174 | struct platform_device *pd; | |
1175 | ||
1176 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1177 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1178 | if (pd->id == id) | |
1179 | return pd; | |
1180 | ||
1181 | return NULL; | |
1182 | } | |
1183 | ||
1184 | /** | |
4d26e139 | 1185 | * early_platform_left - check if early platform driver has matching devices |
d86c1302 | 1186 | * @epdrv: early platform driver structure |
13977091 MD |
1187 | * @id: return true if id or above exists |
1188 | */ | |
a8257910 | 1189 | static int __init early_platform_left(struct early_platform_driver *epdrv, |
13977091 MD |
1190 | int id) |
1191 | { | |
1192 | struct platform_device *pd; | |
1193 | ||
1194 | list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) | |
1195 | if (platform_match(&pd->dev, &epdrv->pdrv->driver)) | |
1196 | if (pd->id >= id) | |
1197 | return 1; | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | /** | |
4d26e139 | 1203 | * early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091 MD |
1204 | * @class_str: string to identify early platform driver class |
1205 | * @id: id to match against | |
1206 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1207 | */ | |
1208 | static int __init early_platform_driver_probe_id(char *class_str, | |
1209 | int id, | |
1210 | int nr_probe) | |
1211 | { | |
1212 | struct early_platform_driver *epdrv; | |
1213 | struct platform_device *match; | |
1214 | int match_id; | |
1215 | int n = 0; | |
1216 | int left = 0; | |
1217 | ||
1218 | list_for_each_entry(epdrv, &early_platform_driver_list, list) { | |
1219 | /* only use drivers matching our class_str */ | |
1220 | if (strcmp(class_str, epdrv->class_str)) | |
1221 | continue; | |
1222 | ||
1223 | if (id == -2) { | |
1224 | match_id = epdrv->requested_id; | |
1225 | left = 1; | |
1226 | ||
1227 | } else { | |
1228 | match_id = id; | |
1229 | left += early_platform_left(epdrv, id); | |
1230 | ||
1231 | /* skip requested id */ | |
1232 | switch (epdrv->requested_id) { | |
1233 | case EARLY_PLATFORM_ID_ERROR: | |
1234 | case EARLY_PLATFORM_ID_UNSET: | |
1235 | break; | |
1236 | default: | |
1237 | if (epdrv->requested_id == id) | |
1238 | match_id = EARLY_PLATFORM_ID_UNSET; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | switch (match_id) { | |
1243 | case EARLY_PLATFORM_ID_ERROR: | |
0258e182 FP |
1244 | pr_warn("%s: unable to parse %s parameter\n", |
1245 | class_str, epdrv->pdrv->driver.name); | |
13977091 MD |
1246 | /* fall-through */ |
1247 | case EARLY_PLATFORM_ID_UNSET: | |
1248 | match = NULL; | |
1249 | break; | |
1250 | default: | |
1251 | match = early_platform_match(epdrv, match_id); | |
1252 | } | |
1253 | ||
1254 | if (match) { | |
a636ee7f PM |
1255 | /* |
1256 | * Set up a sensible init_name to enable | |
1257 | * dev_name() and others to be used before the | |
1258 | * rest of the driver core is initialized. | |
1259 | */ | |
06fe53be | 1260 | if (!match->dev.init_name && slab_is_available()) { |
a636ee7f | 1261 | if (match->id != -1) |
bd05086b PM |
1262 | match->dev.init_name = |
1263 | kasprintf(GFP_KERNEL, "%s.%d", | |
1264 | match->name, | |
1265 | match->id); | |
a636ee7f | 1266 | else |
bd05086b PM |
1267 | match->dev.init_name = |
1268 | kasprintf(GFP_KERNEL, "%s", | |
1269 | match->name); | |
a636ee7f | 1270 | |
a636ee7f PM |
1271 | if (!match->dev.init_name) |
1272 | return -ENOMEM; | |
1273 | } | |
bd05086b | 1274 | |
13977091 | 1275 | if (epdrv->pdrv->probe(match)) |
0258e182 FP |
1276 | pr_warn("%s: unable to probe %s early.\n", |
1277 | class_str, match->name); | |
13977091 MD |
1278 | else |
1279 | n++; | |
1280 | } | |
1281 | ||
1282 | if (n >= nr_probe) | |
1283 | break; | |
1284 | } | |
1285 | ||
1286 | if (left) | |
1287 | return n; | |
1288 | else | |
1289 | return -ENODEV; | |
1290 | } | |
1291 | ||
1292 | /** | |
4d26e139 | 1293 | * early_platform_driver_probe - probe a class of registered drivers |
13977091 MD |
1294 | * @class_str: string to identify early platform driver class |
1295 | * @nr_probe: number of platform devices to successfully probe before exiting | |
1296 | * @user_only: only probe user specified early platform devices | |
4d26e139 MD |
1297 | * |
1298 | * Used by architecture code to probe registered early platform drivers | |
1299 | * within a certain class. For probe to happen a registered early platform | |
1300 | * device matching a registered early platform driver is needed. | |
13977091 MD |
1301 | */ |
1302 | int __init early_platform_driver_probe(char *class_str, | |
1303 | int nr_probe, | |
1304 | int user_only) | |
1305 | { | |
1306 | int k, n, i; | |
1307 | ||
1308 | n = 0; | |
1309 | for (i = -2; n < nr_probe; i++) { | |
1310 | k = early_platform_driver_probe_id(class_str, i, nr_probe - n); | |
1311 | ||
1312 | if (k < 0) | |
1313 | break; | |
1314 | ||
1315 | n += k; | |
1316 | ||
1317 | if (user_only) | |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | return n; | |
1322 | } | |
1323 | ||
1324 | /** | |
1325 | * early_platform_cleanup - clean up early platform code | |
1326 | */ | |
1327 | void __init early_platform_cleanup(void) | |
1328 | { | |
1329 | struct platform_device *pd, *pd2; | |
1330 | ||
1331 | /* clean up the devres list used to chain devices */ | |
1332 | list_for_each_entry_safe(pd, pd2, &early_platform_device_list, | |
1333 | dev.devres_head) { | |
1334 | list_del(&pd->dev.devres_head); | |
1335 | memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); | |
1336 | } | |
1337 | } | |
1338 |