summaryrefslogtreecommitdiff
path: root/include/linux/reset.h
blob: 05aa9f440f484edcfd4710f050c3d95b8d4ff6c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_RESET_H_
#define _LINUX_RESET_H_

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/types.h>

struct device;
struct device_node;
struct reset_control;

#ifdef CONFIG_RESET_CONTROLLER

int reset_control_reset(struct reset_control *rstc);
int reset_control_assert(struct reset_control *rstc);
int reset_control_deassert(struct reset_control *rstc);
int reset_control_status(struct reset_control *rstc);
int reset_control_acquire(struct reset_control *rstc);
void reset_control_release(struct reset_control *rstc);

struct reset_control *__of_reset_control_get(struct device_node *node,
				     const char *id, int index, bool shared,
				     bool optional, bool acquired);
struct reset_control *__reset_control_get(struct device *dev, const char *id,
					  int index, bool shared,
					  bool optional, bool acquired);
void reset_control_put(struct reset_control *rstc);
int __device_reset(struct device *dev, bool optional);
struct reset_control *__devm_reset_control_get(struct device *dev,
				     const char *id, int index, bool shared,
				     bool optional, bool acquired);

struct reset_control *devm_reset_control_array_get(struct device *dev,
						   bool shared, bool optional);
struct reset_control *of_reset_control_array_get(struct device_node *np,
						 bool shared, bool optional,
						 bool acquired);

int reset_control_get_count(struct device *dev);

#else

static inline int reset_control_reset(struct reset_control *rstc)
{
	return 0;
}

static inline int reset_control_assert(struct reset_control *rstc)
{
	return 0;
}

static inline int reset_control_deassert(struct reset_control *rstc)
{
	return 0;
}

static inline int reset_control_status(struct reset_control *rstc)
{
	return 0;
}

static inline int reset_control_acquire(struct reset_control *rstc)
{
	return 0;
}

static inline void reset_control_release(struct reset_control *rstc)
{
}

static inline void reset_control_put(struct reset_control *rstc)
{
}

static inline int __device_reset(struct device *dev, bool optional)
{
	return optional ? 0 : -ENOTSUPP;
}

static inline struct reset_control *__of_reset_control_get(
					struct device_node *node,
					const char *id, int index, bool shared,
					bool optional, bool acquired)
{
	return optional ? NULL : ERR_PTR(-ENOTSUPP);
}

static inline struct reset_control *__reset_control_get(
					struct device *dev, const char *id,
					int index, bool shared, bool optional,
					bool acquired)
{
	return optional ? NULL : ERR_PTR(-ENOTSUPP);
}

static inline struct reset_control *__devm_reset_control_get(
					struct device *dev, const char *id,
					int index, bool shared, bool optional,
					bool acquired)
{
	return optional ? NULL : ERR_PTR(-ENOTSUPP);
}

static inline struct reset_control *
devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
{
	return optional ? NULL : ERR_PTR(-ENOTSUPP);
}

static inline struct reset_control *
of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
			   bool acquired)
{
	return optional ? NULL : ERR_PTR(-ENOTSUPP);
}

static inline int reset_control_get_count(struct device *dev)
{
	return -ENOENT;
}

#endif /* CONFIG_RESET_CONTROLLER */

static inline int __must_check device_reset(struct device *dev)
{
	return __device_reset(dev, false);
}

static inline int device_reset_optional(struct device *dev)
{
	return __device_reset(dev, true);
}

/**
 * reset_control_get_exclusive - Lookup and obtain an exclusive reference
 *                               to a reset controller.
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 * If this function is called more than once for the same reset_control it will
 * return -EBUSY.
 *
 * See reset_control_get_shared() for details on shared references to
 * reset-controls.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *
__must_check reset_control_get_exclusive(struct device *dev, const char *id)
{
	return __reset_control_get(dev, id, 0, false, false, true);
}

/**
 * reset_control_get_exclusive_released - Lookup and obtain a temoprarily
 *                                        exclusive reference to a reset
 *                                        controller.
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 * reset-controls returned by this function must be acquired via
 * reset_control_acquire() before they can be used and should be released
 * via reset_control_release() afterwards.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *
__must_check reset_control_get_exclusive_released(struct device *dev,
						  const char *id)
{
	return __reset_control_get(dev, id, 0, false, false, false);
}

/**
 * reset_control_get_shared - Lookup and obtain a shared reference to a
 *                            reset controller.
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 * This function is intended for use with reset-controls which are shared
 * between hardware blocks.
 *
 * When a reset-control is shared, the behavior of reset_control_assert /
 * deassert is changed, the reset-core will keep track of a deassert_count
 * and only (re-)assert the reset after reset_control_assert has been called
 * as many times as reset_control_deassert was called. Also see the remark
 * about shared reset-controls in the reset_control_assert docs.
 *
 * Calling reset_control_assert without first calling reset_control_deassert
 * is not allowed on a shared reset control. Calling reset_control_reset is
 * also not allowed on a shared reset control.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *reset_control_get_shared(
					struct device *dev, const char *id)
{
	return __reset_control_get(dev, id, 0, true, false, false);
}

/**
 * reset_control_get_optional_exclusive - optional reset_control_get_exclusive()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Optional variant of reset_control_get_exclusive(). If the requested reset
 * is not specified in the device tree, this function returns NULL instead of
 * an error.
 *
 * See reset_control_get_exclusive() for more information.
 */
static inline struct reset_control *reset_control_get_optional_exclusive(
					struct device *dev, const char *id)
{
	return __reset_control_get(dev, id, 0, false, true, true);
}

/**
 * reset_control_get_optional_shared - optional reset_control_get_shared()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Optional variant of reset_control_get_shared(). If the requested reset
 * is not specified in the device tree, this function returns NULL instead of
 * an error.
 *
 * See reset_control_get_shared() for more information.
 */
static inline struct reset_control *reset_control_get_optional_shared(
					struct device *dev, const char *id)
{
	return __reset_control_get(dev, id, 0, true, true, false);
}

/**
 * of_reset_control_get_exclusive - Lookup and obtain an exclusive reference
 *                                  to a reset controller.
 * @node: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *of_reset_control_get_exclusive(
				struct device_node *node, const char *id)
{
	return __of_reset_control_get(node, id, 0, false, false, true);
}

/**
 * of_reset_control_get_shared - Lookup and obtain a shared reference
 *                               to a reset controller.
 * @node: device to be reset by the controller
 * @id: reset line name
 *
 * When a reset-control is shared, the behavior of reset_control_assert /
 * deassert is changed, the reset-core will keep track of a deassert_count
 * and only (re-)assert the reset after reset_control_assert has been called
 * as many times as reset_control_deassert was called. Also see the remark
 * about shared reset-controls in the reset_control_assert docs.
 *
 * Calling reset_control_assert without first calling reset_control_deassert
 * is not allowed on a shared reset control. Calling reset_control_reset is
 * also not allowed on a shared reset control.
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *of_reset_control_get_shared(
				struct device_node *node, const char *id)
{
	return __of_reset_control_get(node, id, 0, true, false, false);
}

/**
 * of_reset_control_get_exclusive_by_index - Lookup and obtain an exclusive
 *                                           reference to a reset controller
 *                                           by index.
 * @node: device to be reset by the controller
 * @index: index of the reset controller
 *
 * This is to be used to perform a list of resets for a device or power domain
 * in whatever order. Returns a struct reset_control or IS_ERR() condition
 * containing errno.
 */
static inline struct reset_control *of_reset_control_get_exclusive_by_index(
					struct device_node *node, int index)
{
	return __of_reset_control_get(node, NULL, index, false, false, true);
}

/**
 * of_reset_control_get_shared_by_index - Lookup and obtain a shared
 *                                        reference to a reset controller
 *                                        by index.
 * @node: device to be reset by the controller
 * @index: index of the reset controller
 *
 * When a reset-control is shared, the behavior of reset_control_assert /
 * deassert is changed, the reset-core will keep track of a deassert_count
 * and only (re-)assert the reset after reset_control_assert has been called
 * as many times as reset_control_deassert was called. Also see the remark
 * about shared reset-controls in the reset_control_assert docs.
 *
 * Calling reset_control_assert without first calling reset_control_deassert
 * is not allowed on a shared reset control. Calling reset_control_reset is
 * also not allowed on a shared reset control.
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 *
 * This is to be used to perform a list of resets for a device or power domain
 * in whatever order. Returns a struct reset_control or IS_ERR() condition
 * containing errno.
 */
static inline struct reset_control *of_reset_control_get_shared_by_index(
					struct device_node *node, int index)
{
	return __of_reset_control_get(node, NULL, index, true, false, false);
}

/**
 * devm_reset_control_get_exclusive - resource managed
 *                                    reset_control_get_exclusive()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get_exclusive(). For reset controllers returned
 * from this function, reset_control_put() is called automatically on driver
 * detach.
 *
 * See reset_control_get_exclusive() for more information.
 */
static inline struct reset_control *
__must_check devm_reset_control_get_exclusive(struct device *dev,
					      const char *id)
{
	return __devm_reset_control_get(dev, id, 0, false, false, true);
}

/**
 * devm_reset_control_get_exclusive_released - resource managed
 *                                             reset_control_get_exclusive_released()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get_exclusive_released(). For reset controllers
 * returned from this function, reset_control_put() is called automatically on
 * driver detach.
 *
 * See reset_control_get_exclusive_released() for more information.
 */
static inline struct reset_control *
__must_check devm_reset_control_get_exclusive_released(struct device *dev,
						       const char *id)
{
	return __devm_reset_control_get(dev, id, 0, false, false, false);
}

/**
 * devm_reset_control_get_shared - resource managed reset_control_get_shared()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get_shared(). For reset controllers returned from
 * this function, reset_control_put() is called automatically on driver detach.
 * See reset_control_get_shared() for more information.
 */
static inline struct reset_control *devm_reset_control_get_shared(
					struct device *dev, const char *id)
{
	return __devm_reset_control_get(dev, id, 0, true, false, false);
}

/**
 * devm_reset_control_get_optional_exclusive - resource managed
 *                                             reset_control_get_optional_exclusive()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get_optional_exclusive(). For reset controllers
 * returned from this function, reset_control_put() is called automatically on
 * driver detach.
 *
 * See reset_control_get_optional_exclusive() for more information.
 */
static inline struct reset_control *devm_reset_control_get_optional_exclusive(
					struct device *dev, const char *id)
{
	return __devm_reset_control_get(dev, id, 0, false, true, true);
}

/**
 * devm_reset_control_get_optional_shared - resource managed
 *                                          reset_control_get_optional_shared()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get_optional_shared(). For reset controllers returned
 * from this function, reset_control_put() is called automatically on driver
 * detach.
 *
 * See reset_control_get_optional_shared() for more information.
 */
static inline struct reset_control *devm_reset_control_get_optional_shared(
					struct device *dev, const char *id)
{
	return __devm_reset_control_get(dev, id, 0, true, true, false);
}

/**
 * devm_reset_control_get_exclusive_by_index - resource managed
 *                                             reset_control_get_exclusive()
 * @dev: device to be reset by the controller
 * @index: index of the reset controller
 *
 * Managed reset_control_get_exclusive(). For reset controllers returned from
 * this function, reset_control_put() is called automatically on driver
 * detach.
 *
 * See reset_control_get_exclusive() for more information.
 */
static inline struct reset_control *
devm_reset_control_get_exclusive_by_index(struct device *dev, int index)
{
	return __devm_reset_control_get(dev, NULL, index, false, false, true);
}

/**
 * devm_reset_control_get_shared_by_index - resource managed
 *                                          reset_control_get_shared
 * @dev: device to be reset by the controller
 * @index: index of the reset controller
 *
 * Managed reset_control_get_shared(). For reset controllers returned from
 * this function, reset_control_put() is called automatically on driver detach.
 * See reset_control_get_shared() for more information.
 */
static inline struct reset_control *
devm_reset_control_get_shared_by_index(struct device *dev, int index)
{
	return __devm_reset_control_get(dev, NULL, index, true, false, false);
}

/*
 * TEMPORARY calls to use during transition:
 *
 *   of_reset_control_get() => of_reset_control_get_exclusive()
 *
 * These inline function calls will be removed once all consumers
 * have been moved over to the new explicit API.
 */
static inline struct reset_control *of_reset_control_get(
				struct device_node *node, const char *id)
{
	return of_reset_control_get_exclusive(node, id);
}

static inline struct reset_control *of_reset_control_get_by_index(
				struct device_node *node, int index)
{
	return of_reset_control_get_exclusive_by_index(node, index);
}

static inline struct reset_control *devm_reset_control_get(
				struct device *dev, const char *id)
{
	return devm_reset_control_get_exclusive(dev, id);
}

static inline struct reset_control *devm_reset_control_get_optional(
				struct device *dev, const char *id)
{
	return devm_reset_control_get_optional_exclusive(dev, id);

}

static inline struct reset_control *devm_reset_control_get_by_index(
				struct device *dev, int index)
{
	return devm_reset_control_get_exclusive_by_index(dev, index);
}

/*
 * APIs to manage a list of reset controllers
 */
static inline struct reset_control *
devm_reset_control_array_get_exclusive(struct device *dev)
{
	return devm_reset_control_array_get(dev, false, false);
}

static inline struct reset_control *
devm_reset_control_array_get_shared(struct device *dev)
{
	return devm_reset_control_array_get(dev, true, false);
}

static inline struct reset_control *
devm_reset_control_array_get_optional_exclusive(struct device *dev)
{
	return devm_reset_control_array_get(dev, false, true);
}

static inline struct reset_control *
devm_reset_control_array_get_optional_shared(struct device *dev)
{
	return devm_reset_control_array_get(dev, true, true);
}

static inline struct reset_control *
of_reset_control_array_get_exclusive(struct device_node *node)
{
	return of_reset_control_array_get(node, false, false, true);
}

static inline struct reset_control *
of_reset_control_array_get_exclusive_released(struct device_node *node)
{
	return of_reset_control_array_get(node, false, false, false);
}

static inline struct reset_control *
of_reset_control_array_get_shared(struct device_node *node)
{
	return of_reset_control_array_get(node, true, false, true);
}

static inline struct reset_control *
of_reset_control_array_get_optional_exclusive(struct device_node *node)
{
	return of_reset_control_array_get(node, false, true, true);
}

static inline struct reset_control *
of_reset_control_array_get_optional_shared(struct device_node *node)
{
	return of_reset_control_array_get(node, true, true, true);
}
#endif