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Commit | Line | Data |
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b83a313b MB |
1 | /* |
2 | * Register map access API | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
f5d6eba7 | 13 | #include <linux/device.h> |
b83a313b | 14 | #include <linux/slab.h> |
19694b5e | 15 | #include <linux/export.h> |
b83a313b MB |
16 | #include <linux/mutex.h> |
17 | #include <linux/err.h> | |
6863ca62 | 18 | #include <linux/rbtree.h> |
b83a313b | 19 | |
fb2736bb MB |
20 | #define CREATE_TRACE_POINTS |
21 | #include <trace/events/regmap.h> | |
22 | ||
93de9124 | 23 | #include "internal.h" |
b83a313b | 24 | |
6863ca62 KG |
25 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
26 | unsigned int mask, unsigned int val, | |
27 | bool *change); | |
28 | ||
8de2f081 MB |
29 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
30 | { | |
31 | if (map->max_register && reg > map->max_register) | |
32 | return false; | |
33 | ||
34 | if (map->writeable_reg) | |
35 | return map->writeable_reg(map->dev, reg); | |
36 | ||
37 | return true; | |
38 | } | |
39 | ||
40 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
41 | { | |
42 | if (map->max_register && reg > map->max_register) | |
43 | return false; | |
44 | ||
4191f197 WS |
45 | if (map->format.format_write) |
46 | return false; | |
47 | ||
8de2f081 MB |
48 | if (map->readable_reg) |
49 | return map->readable_reg(map->dev, reg); | |
50 | ||
51 | return true; | |
52 | } | |
53 | ||
54 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
55 | { | |
4191f197 | 56 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
57 | return false; |
58 | ||
59 | if (map->volatile_reg) | |
60 | return map->volatile_reg(map->dev, reg); | |
61 | ||
62 | return true; | |
63 | } | |
64 | ||
65 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
66 | { | |
4191f197 | 67 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
68 | return false; |
69 | ||
70 | if (map->precious_reg) | |
71 | return map->precious_reg(map->dev, reg); | |
72 | ||
73 | return false; | |
74 | } | |
75 | ||
82cd9965 LPC |
76 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
77 | unsigned int num) | |
78 | { | |
79 | unsigned int i; | |
80 | ||
81 | for (i = 0; i < num; i++) | |
82 | if (!regmap_volatile(map, reg + i)) | |
83 | return false; | |
84 | ||
85 | return true; | |
86 | } | |
87 | ||
9aa50750 WS |
88 | static void regmap_format_2_6_write(struct regmap *map, |
89 | unsigned int reg, unsigned int val) | |
90 | { | |
91 | u8 *out = map->work_buf; | |
92 | ||
93 | *out = (reg << 6) | val; | |
94 | } | |
95 | ||
b83a313b MB |
96 | static void regmap_format_4_12_write(struct regmap *map, |
97 | unsigned int reg, unsigned int val) | |
98 | { | |
99 | __be16 *out = map->work_buf; | |
100 | *out = cpu_to_be16((reg << 12) | val); | |
101 | } | |
102 | ||
103 | static void regmap_format_7_9_write(struct regmap *map, | |
104 | unsigned int reg, unsigned int val) | |
105 | { | |
106 | __be16 *out = map->work_buf; | |
107 | *out = cpu_to_be16((reg << 9) | val); | |
108 | } | |
109 | ||
7e5ec63e LPC |
110 | static void regmap_format_10_14_write(struct regmap *map, |
111 | unsigned int reg, unsigned int val) | |
112 | { | |
113 | u8 *out = map->work_buf; | |
114 | ||
115 | out[2] = val; | |
116 | out[1] = (val >> 8) | (reg << 6); | |
117 | out[0] = reg >> 2; | |
118 | } | |
119 | ||
d939fb9a | 120 | static void regmap_format_8(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
121 | { |
122 | u8 *b = buf; | |
123 | ||
d939fb9a | 124 | b[0] = val << shift; |
b83a313b MB |
125 | } |
126 | ||
d939fb9a | 127 | static void regmap_format_16(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
128 | { |
129 | __be16 *b = buf; | |
130 | ||
d939fb9a | 131 | b[0] = cpu_to_be16(val << shift); |
b83a313b MB |
132 | } |
133 | ||
d939fb9a | 134 | static void regmap_format_24(void *buf, unsigned int val, unsigned int shift) |
ea279fc5 MR |
135 | { |
136 | u8 *b = buf; | |
137 | ||
d939fb9a MR |
138 | val <<= shift; |
139 | ||
ea279fc5 MR |
140 | b[0] = val >> 16; |
141 | b[1] = val >> 8; | |
142 | b[2] = val; | |
143 | } | |
144 | ||
d939fb9a | 145 | static void regmap_format_32(void *buf, unsigned int val, unsigned int shift) |
7d5e525b MB |
146 | { |
147 | __be32 *b = buf; | |
148 | ||
d939fb9a | 149 | b[0] = cpu_to_be32(val << shift); |
7d5e525b MB |
150 | } |
151 | ||
b83a313b MB |
152 | static unsigned int regmap_parse_8(void *buf) |
153 | { | |
154 | u8 *b = buf; | |
155 | ||
156 | return b[0]; | |
157 | } | |
158 | ||
159 | static unsigned int regmap_parse_16(void *buf) | |
160 | { | |
161 | __be16 *b = buf; | |
162 | ||
163 | b[0] = be16_to_cpu(b[0]); | |
164 | ||
165 | return b[0]; | |
166 | } | |
167 | ||
ea279fc5 MR |
168 | static unsigned int regmap_parse_24(void *buf) |
169 | { | |
170 | u8 *b = buf; | |
171 | unsigned int ret = b[2]; | |
172 | ret |= ((unsigned int)b[1]) << 8; | |
173 | ret |= ((unsigned int)b[0]) << 16; | |
174 | ||
175 | return ret; | |
176 | } | |
177 | ||
7d5e525b MB |
178 | static unsigned int regmap_parse_32(void *buf) |
179 | { | |
180 | __be32 *b = buf; | |
181 | ||
182 | b[0] = be32_to_cpu(b[0]); | |
183 | ||
184 | return b[0]; | |
185 | } | |
186 | ||
bacdbe07 SW |
187 | static void regmap_lock_mutex(struct regmap *map) |
188 | { | |
189 | mutex_lock(&map->mutex); | |
190 | } | |
191 | ||
192 | static void regmap_unlock_mutex(struct regmap *map) | |
193 | { | |
194 | mutex_unlock(&map->mutex); | |
195 | } | |
196 | ||
197 | static void regmap_lock_spinlock(struct regmap *map) | |
198 | { | |
199 | spin_lock(&map->spinlock); | |
200 | } | |
201 | ||
202 | static void regmap_unlock_spinlock(struct regmap *map) | |
203 | { | |
204 | spin_unlock(&map->spinlock); | |
205 | } | |
206 | ||
72b39f6f MB |
207 | static void dev_get_regmap_release(struct device *dev, void *res) |
208 | { | |
209 | /* | |
210 | * We don't actually have anything to do here; the goal here | |
211 | * is not to manage the regmap but to provide a simple way to | |
212 | * get the regmap back given a struct device. | |
213 | */ | |
214 | } | |
215 | ||
6863ca62 KG |
216 | static bool _regmap_range_add(struct regmap *map, |
217 | struct regmap_range_node *data) | |
218 | { | |
219 | struct rb_root *root = &map->range_tree; | |
220 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
221 | ||
222 | while (*new) { | |
223 | struct regmap_range_node *this = | |
224 | container_of(*new, struct regmap_range_node, node); | |
225 | ||
226 | parent = *new; | |
227 | if (data->range_max < this->range_min) | |
228 | new = &((*new)->rb_left); | |
229 | else if (data->range_min > this->range_max) | |
230 | new = &((*new)->rb_right); | |
231 | else | |
232 | return false; | |
233 | } | |
234 | ||
235 | rb_link_node(&data->node, parent, new); | |
236 | rb_insert_color(&data->node, root); | |
237 | ||
238 | return true; | |
239 | } | |
240 | ||
241 | static struct regmap_range_node *_regmap_range_lookup(struct regmap *map, | |
242 | unsigned int reg) | |
243 | { | |
244 | struct rb_node *node = map->range_tree.rb_node; | |
245 | ||
246 | while (node) { | |
247 | struct regmap_range_node *this = | |
248 | container_of(node, struct regmap_range_node, node); | |
249 | ||
250 | if (reg < this->range_min) | |
251 | node = node->rb_left; | |
252 | else if (reg > this->range_max) | |
253 | node = node->rb_right; | |
254 | else | |
255 | return this; | |
256 | } | |
257 | ||
258 | return NULL; | |
259 | } | |
260 | ||
261 | static void regmap_range_exit(struct regmap *map) | |
262 | { | |
263 | struct rb_node *next; | |
264 | struct regmap_range_node *range_node; | |
265 | ||
266 | next = rb_first(&map->range_tree); | |
267 | while (next) { | |
268 | range_node = rb_entry(next, struct regmap_range_node, node); | |
269 | next = rb_next(&range_node->node); | |
270 | rb_erase(&range_node->node, &map->range_tree); | |
271 | kfree(range_node); | |
272 | } | |
273 | ||
274 | kfree(map->selector_work_buf); | |
275 | } | |
276 | ||
b83a313b MB |
277 | /** |
278 | * regmap_init(): Initialise register map | |
279 | * | |
280 | * @dev: Device that will be interacted with | |
281 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 282 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
283 | * @config: Configuration for register map |
284 | * | |
285 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
286 | * a struct regmap. This function should generally not be called | |
287 | * directly, it should be called by bus-specific init functions. | |
288 | */ | |
289 | struct regmap *regmap_init(struct device *dev, | |
290 | const struct regmap_bus *bus, | |
0135bbcc | 291 | void *bus_context, |
b83a313b MB |
292 | const struct regmap_config *config) |
293 | { | |
72b39f6f | 294 | struct regmap *map, **m; |
b83a313b | 295 | int ret = -EINVAL; |
6863ca62 | 296 | int i, j; |
b83a313b MB |
297 | |
298 | if (!bus || !config) | |
abbb18fb | 299 | goto err; |
b83a313b MB |
300 | |
301 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
302 | if (map == NULL) { | |
303 | ret = -ENOMEM; | |
304 | goto err; | |
305 | } | |
306 | ||
bacdbe07 SW |
307 | if (bus->fast_io) { |
308 | spin_lock_init(&map->spinlock); | |
309 | map->lock = regmap_lock_spinlock; | |
310 | map->unlock = regmap_unlock_spinlock; | |
311 | } else { | |
312 | mutex_init(&map->mutex); | |
313 | map->lock = regmap_lock_mutex; | |
314 | map->unlock = regmap_unlock_mutex; | |
315 | } | |
c212accc | 316 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 317 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 318 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
5494a98f FE |
319 | map->format.buf_size = DIV_ROUND_UP(config->reg_bits + |
320 | config->val_bits + config->pad_bits, 8); | |
d939fb9a | 321 | map->reg_shift = config->pad_bits % 8; |
f01ee60f SW |
322 | if (config->reg_stride) |
323 | map->reg_stride = config->reg_stride; | |
324 | else | |
325 | map->reg_stride = 1; | |
2e33caf1 | 326 | map->use_single_rw = config->use_single_rw; |
b83a313b MB |
327 | map->dev = dev; |
328 | map->bus = bus; | |
0135bbcc | 329 | map->bus_context = bus_context; |
2e2ae66d MB |
330 | map->max_register = config->max_register; |
331 | map->writeable_reg = config->writeable_reg; | |
332 | map->readable_reg = config->readable_reg; | |
333 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 334 | map->precious_reg = config->precious_reg; |
5d1729e7 | 335 | map->cache_type = config->cache_type; |
72b39f6f | 336 | map->name = config->name; |
b83a313b | 337 | |
6f306441 LPC |
338 | if (config->read_flag_mask || config->write_flag_mask) { |
339 | map->read_flag_mask = config->read_flag_mask; | |
340 | map->write_flag_mask = config->write_flag_mask; | |
341 | } else { | |
342 | map->read_flag_mask = bus->read_flag_mask; | |
343 | } | |
344 | ||
d939fb9a | 345 | switch (config->reg_bits + map->reg_shift) { |
9aa50750 WS |
346 | case 2: |
347 | switch (config->val_bits) { | |
348 | case 6: | |
349 | map->format.format_write = regmap_format_2_6_write; | |
350 | break; | |
351 | default: | |
352 | goto err_map; | |
353 | } | |
354 | break; | |
355 | ||
b83a313b MB |
356 | case 4: |
357 | switch (config->val_bits) { | |
358 | case 12: | |
359 | map->format.format_write = regmap_format_4_12_write; | |
360 | break; | |
361 | default: | |
362 | goto err_map; | |
363 | } | |
364 | break; | |
365 | ||
366 | case 7: | |
367 | switch (config->val_bits) { | |
368 | case 9: | |
369 | map->format.format_write = regmap_format_7_9_write; | |
370 | break; | |
371 | default: | |
372 | goto err_map; | |
373 | } | |
374 | break; | |
375 | ||
7e5ec63e LPC |
376 | case 10: |
377 | switch (config->val_bits) { | |
378 | case 14: | |
379 | map->format.format_write = regmap_format_10_14_write; | |
380 | break; | |
381 | default: | |
382 | goto err_map; | |
383 | } | |
384 | break; | |
385 | ||
b83a313b MB |
386 | case 8: |
387 | map->format.format_reg = regmap_format_8; | |
388 | break; | |
389 | ||
390 | case 16: | |
391 | map->format.format_reg = regmap_format_16; | |
392 | break; | |
393 | ||
7d5e525b MB |
394 | case 32: |
395 | map->format.format_reg = regmap_format_32; | |
396 | break; | |
397 | ||
b83a313b MB |
398 | default: |
399 | goto err_map; | |
400 | } | |
401 | ||
402 | switch (config->val_bits) { | |
403 | case 8: | |
404 | map->format.format_val = regmap_format_8; | |
405 | map->format.parse_val = regmap_parse_8; | |
406 | break; | |
407 | case 16: | |
408 | map->format.format_val = regmap_format_16; | |
409 | map->format.parse_val = regmap_parse_16; | |
410 | break; | |
ea279fc5 MR |
411 | case 24: |
412 | map->format.format_val = regmap_format_24; | |
413 | map->format.parse_val = regmap_parse_24; | |
414 | break; | |
7d5e525b MB |
415 | case 32: |
416 | map->format.format_val = regmap_format_32; | |
417 | map->format.parse_val = regmap_parse_32; | |
418 | break; | |
b83a313b MB |
419 | } |
420 | ||
7a647614 MB |
421 | if (map->format.format_write) |
422 | map->use_single_rw = true; | |
423 | ||
b83a313b MB |
424 | if (!map->format.format_write && |
425 | !(map->format.format_reg && map->format.format_val)) | |
426 | goto err_map; | |
427 | ||
82159ba8 | 428 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
429 | if (map->work_buf == NULL) { |
430 | ret = -ENOMEM; | |
5204f5e3 | 431 | goto err_map; |
b83a313b MB |
432 | } |
433 | ||
6863ca62 KG |
434 | map->range_tree = RB_ROOT; |
435 | for (i = 0; i < config->n_ranges; i++) { | |
436 | const struct regmap_range_cfg *range_cfg = &config->ranges[i]; | |
437 | struct regmap_range_node *new; | |
438 | ||
439 | /* Sanity check */ | |
440 | if (range_cfg->range_max < range_cfg->range_min || | |
441 | range_cfg->range_max > map->max_register || | |
442 | range_cfg->selector_reg > map->max_register || | |
443 | range_cfg->window_len == 0) | |
444 | goto err_range; | |
445 | ||
446 | /* Make sure, that this register range has no selector | |
447 | or data window within its boundary */ | |
448 | for (j = 0; j < config->n_ranges; j++) { | |
449 | unsigned sel_reg = config->ranges[j].selector_reg; | |
450 | unsigned win_min = config->ranges[j].window_start; | |
451 | unsigned win_max = win_min + | |
452 | config->ranges[j].window_len - 1; | |
453 | ||
454 | if (range_cfg->range_min <= sel_reg && | |
455 | sel_reg <= range_cfg->range_max) { | |
456 | goto err_range; | |
457 | } | |
458 | ||
459 | if (!(win_max < range_cfg->range_min || | |
460 | win_min > range_cfg->range_max)) { | |
461 | goto err_range; | |
462 | } | |
463 | } | |
464 | ||
465 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
466 | if (new == NULL) { | |
467 | ret = -ENOMEM; | |
468 | goto err_range; | |
469 | } | |
470 | ||
471 | new->range_min = range_cfg->range_min; | |
472 | new->range_max = range_cfg->range_max; | |
473 | new->selector_reg = range_cfg->selector_reg; | |
474 | new->selector_mask = range_cfg->selector_mask; | |
475 | new->selector_shift = range_cfg->selector_shift; | |
476 | new->window_start = range_cfg->window_start; | |
477 | new->window_len = range_cfg->window_len; | |
478 | ||
479 | if (_regmap_range_add(map, new) == false) { | |
480 | kfree(new); | |
481 | goto err_range; | |
482 | } | |
483 | ||
484 | if (map->selector_work_buf == NULL) { | |
485 | map->selector_work_buf = | |
486 | kzalloc(map->format.buf_size, GFP_KERNEL); | |
487 | if (map->selector_work_buf == NULL) { | |
488 | ret = -ENOMEM; | |
489 | goto err_range; | |
490 | } | |
491 | } | |
492 | } | |
052d2cd1 | 493 | |
e5e3b8ab | 494 | ret = regcache_init(map, config); |
5d1729e7 | 495 | if (ret < 0) |
6863ca62 KG |
496 | goto err_range; |
497 | ||
498 | regmap_debugfs_init(map, config->name); | |
5d1729e7 | 499 | |
72b39f6f MB |
500 | /* Add a devres resource for dev_get_regmap() */ |
501 | m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL); | |
502 | if (!m) { | |
503 | ret = -ENOMEM; | |
6863ca62 | 504 | goto err_debugfs; |
72b39f6f MB |
505 | } |
506 | *m = map; | |
507 | devres_add(dev, m); | |
508 | ||
b83a313b MB |
509 | return map; |
510 | ||
bfaa25f3 SW |
511 | err_debugfs: |
512 | regmap_debugfs_exit(map); | |
6863ca62 KG |
513 | regcache_exit(map); |
514 | err_range: | |
515 | regmap_range_exit(map); | |
58072cbf | 516 | kfree(map->work_buf); |
b83a313b MB |
517 | err_map: |
518 | kfree(map); | |
519 | err: | |
520 | return ERR_PTR(ret); | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(regmap_init); | |
523 | ||
c0eb4676 MB |
524 | static void devm_regmap_release(struct device *dev, void *res) |
525 | { | |
526 | regmap_exit(*(struct regmap **)res); | |
527 | } | |
528 | ||
529 | /** | |
530 | * devm_regmap_init(): Initialise managed register map | |
531 | * | |
532 | * @dev: Device that will be interacted with | |
533 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 534 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
535 | * @config: Configuration for register map |
536 | * | |
537 | * The return value will be an ERR_PTR() on error or a valid pointer | |
538 | * to a struct regmap. This function should generally not be called | |
539 | * directly, it should be called by bus-specific init functions. The | |
540 | * map will be automatically freed by the device management code. | |
541 | */ | |
542 | struct regmap *devm_regmap_init(struct device *dev, | |
543 | const struct regmap_bus *bus, | |
0135bbcc | 544 | void *bus_context, |
c0eb4676 MB |
545 | const struct regmap_config *config) |
546 | { | |
547 | struct regmap **ptr, *regmap; | |
548 | ||
549 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
550 | if (!ptr) | |
551 | return ERR_PTR(-ENOMEM); | |
552 | ||
0135bbcc | 553 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
554 | if (!IS_ERR(regmap)) { |
555 | *ptr = regmap; | |
556 | devres_add(dev, ptr); | |
557 | } else { | |
558 | devres_free(ptr); | |
559 | } | |
560 | ||
561 | return regmap; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
564 | ||
bf315173 MB |
565 | /** |
566 | * regmap_reinit_cache(): Reinitialise the current register cache | |
567 | * | |
568 | * @map: Register map to operate on. | |
569 | * @config: New configuration. Only the cache data will be used. | |
570 | * | |
571 | * Discard any existing register cache for the map and initialize a | |
572 | * new cache. This can be used to restore the cache to defaults or to | |
573 | * update the cache configuration to reflect runtime discovery of the | |
574 | * hardware. | |
575 | */ | |
576 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
577 | { | |
578 | int ret; | |
579 | ||
bacdbe07 | 580 | map->lock(map); |
bf315173 MB |
581 | |
582 | regcache_exit(map); | |
a24f64a6 | 583 | regmap_debugfs_exit(map); |
bf315173 MB |
584 | |
585 | map->max_register = config->max_register; | |
586 | map->writeable_reg = config->writeable_reg; | |
587 | map->readable_reg = config->readable_reg; | |
588 | map->volatile_reg = config->volatile_reg; | |
589 | map->precious_reg = config->precious_reg; | |
590 | map->cache_type = config->cache_type; | |
591 | ||
d3c242e1 | 592 | regmap_debugfs_init(map, config->name); |
a24f64a6 | 593 | |
421e8d2d MB |
594 | map->cache_bypass = false; |
595 | map->cache_only = false; | |
596 | ||
bf315173 MB |
597 | ret = regcache_init(map, config); |
598 | ||
bacdbe07 | 599 | map->unlock(map); |
bf315173 MB |
600 | |
601 | return ret; | |
602 | } | |
752a6a5f | 603 | EXPORT_SYMBOL_GPL(regmap_reinit_cache); |
bf315173 | 604 | |
b83a313b MB |
605 | /** |
606 | * regmap_exit(): Free a previously allocated register map | |
607 | */ | |
608 | void regmap_exit(struct regmap *map) | |
609 | { | |
5d1729e7 | 610 | regcache_exit(map); |
31244e39 | 611 | regmap_debugfs_exit(map); |
6863ca62 | 612 | regmap_range_exit(map); |
0135bbcc SW |
613 | if (map->bus->free_context) |
614 | map->bus->free_context(map->bus_context); | |
b83a313b | 615 | kfree(map->work_buf); |
b83a313b MB |
616 | kfree(map); |
617 | } | |
618 | EXPORT_SYMBOL_GPL(regmap_exit); | |
619 | ||
72b39f6f MB |
620 | static int dev_get_regmap_match(struct device *dev, void *res, void *data) |
621 | { | |
622 | struct regmap **r = res; | |
623 | if (!r || !*r) { | |
624 | WARN_ON(!r || !*r); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | /* If the user didn't specify a name match any */ | |
629 | if (data) | |
630 | return (*r)->name == data; | |
631 | else | |
632 | return 1; | |
633 | } | |
634 | ||
635 | /** | |
636 | * dev_get_regmap(): Obtain the regmap (if any) for a device | |
637 | * | |
638 | * @dev: Device to retrieve the map for | |
639 | * @name: Optional name for the register map, usually NULL. | |
640 | * | |
641 | * Returns the regmap for the device if one is present, or NULL. If | |
642 | * name is specified then it must match the name specified when | |
643 | * registering the device, if it is NULL then the first regmap found | |
644 | * will be used. Devices with multiple register maps are very rare, | |
645 | * generic code should normally not need to specify a name. | |
646 | */ | |
647 | struct regmap *dev_get_regmap(struct device *dev, const char *name) | |
648 | { | |
649 | struct regmap **r = devres_find(dev, dev_get_regmap_release, | |
650 | dev_get_regmap_match, (void *)name); | |
651 | ||
652 | if (!r) | |
653 | return NULL; | |
654 | return *r; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(dev_get_regmap); | |
657 | ||
6863ca62 KG |
658 | static int _regmap_select_page(struct regmap *map, unsigned int *reg, |
659 | unsigned int val_num) | |
660 | { | |
661 | struct regmap_range_node *range; | |
662 | void *orig_work_buf; | |
663 | unsigned int win_offset; | |
664 | unsigned int win_page; | |
665 | bool page_chg; | |
666 | int ret; | |
667 | ||
668 | range = _regmap_range_lookup(map, *reg); | |
669 | if (range) { | |
670 | win_offset = (*reg - range->range_min) % range->window_len; | |
671 | win_page = (*reg - range->range_min) / range->window_len; | |
672 | ||
673 | if (val_num > 1) { | |
674 | /* Bulk write shouldn't cross range boundary */ | |
675 | if (*reg + val_num - 1 > range->range_max) | |
676 | return -EINVAL; | |
677 | ||
678 | /* ... or single page boundary */ | |
679 | if (val_num > range->window_len - win_offset) | |
680 | return -EINVAL; | |
681 | } | |
682 | ||
683 | /* It is possible to have selector register inside data window. | |
684 | In that case, selector register is located on every page and | |
685 | it needs no page switching, when accessed alone. */ | |
686 | if (val_num > 1 || | |
687 | range->window_start + win_offset != range->selector_reg) { | |
688 | /* Use separate work_buf during page switching */ | |
689 | orig_work_buf = map->work_buf; | |
690 | map->work_buf = map->selector_work_buf; | |
691 | ||
692 | ret = _regmap_update_bits(map, range->selector_reg, | |
693 | range->selector_mask, | |
694 | win_page << range->selector_shift, | |
695 | &page_chg); | |
696 | if (ret < 0) | |
697 | return ret; | |
698 | ||
699 | map->work_buf = orig_work_buf; | |
700 | } | |
701 | ||
702 | *reg = range->window_start + win_offset; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
b83a313b MB |
708 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, |
709 | const void *val, size_t val_len) | |
710 | { | |
6f306441 | 711 | u8 *u8 = map->work_buf; |
b83a313b MB |
712 | void *buf; |
713 | int ret = -ENOTSUPP; | |
714 | size_t len; | |
73304781 MB |
715 | int i; |
716 | ||
717 | /* Check for unwritable registers before we start */ | |
718 | if (map->writeable_reg) | |
719 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
f01ee60f SW |
720 | if (!map->writeable_reg(map->dev, |
721 | reg + (i * map->reg_stride))) | |
73304781 | 722 | return -EINVAL; |
b83a313b | 723 | |
c9157198 LD |
724 | if (!map->cache_bypass && map->format.parse_val) { |
725 | unsigned int ival; | |
726 | int val_bytes = map->format.val_bytes; | |
727 | for (i = 0; i < val_len / val_bytes; i++) { | |
728 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
729 | ival = map->format.parse_val(map->work_buf); | |
f01ee60f SW |
730 | ret = regcache_write(map, reg + (i * map->reg_stride), |
731 | ival); | |
c9157198 LD |
732 | if (ret) { |
733 | dev_err(map->dev, | |
734 | "Error in caching of register: %u ret: %d\n", | |
735 | reg + i, ret); | |
736 | return ret; | |
737 | } | |
738 | } | |
739 | if (map->cache_only) { | |
740 | map->cache_dirty = true; | |
741 | return 0; | |
742 | } | |
743 | } | |
744 | ||
6863ca62 KG |
745 | ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes); |
746 | if (ret < 0) | |
747 | return ret; | |
748 | ||
d939fb9a | 749 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b | 750 | |
6f306441 LPC |
751 | u8[0] |= map->write_flag_mask; |
752 | ||
fb2736bb MB |
753 | trace_regmap_hw_write_start(map->dev, reg, |
754 | val_len / map->format.val_bytes); | |
755 | ||
2547e201 MB |
756 | /* If we're doing a single register write we can probably just |
757 | * send the work_buf directly, otherwise try to do a gather | |
758 | * write. | |
759 | */ | |
82159ba8 MB |
760 | if (val == (map->work_buf + map->format.pad_bytes + |
761 | map->format.reg_bytes)) | |
0135bbcc | 762 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
763 | map->format.reg_bytes + |
764 | map->format.pad_bytes + | |
765 | val_len); | |
2547e201 | 766 | else if (map->bus->gather_write) |
0135bbcc | 767 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
768 | map->format.reg_bytes + |
769 | map->format.pad_bytes, | |
b83a313b MB |
770 | val, val_len); |
771 | ||
2547e201 | 772 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 773 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
774 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
775 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
776 | if (!buf) |
777 | return -ENOMEM; | |
778 | ||
779 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
780 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
781 | val, val_len); | |
0135bbcc | 782 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
783 | |
784 | kfree(buf); | |
785 | } | |
786 | ||
fb2736bb MB |
787 | trace_regmap_hw_write_done(map->dev, reg, |
788 | val_len / map->format.val_bytes); | |
789 | ||
b83a313b MB |
790 | return ret; |
791 | } | |
792 | ||
4d2dc095 DP |
793 | int _regmap_write(struct regmap *map, unsigned int reg, |
794 | unsigned int val) | |
b83a313b | 795 | { |
fb2736bb | 796 | int ret; |
b83a313b MB |
797 | BUG_ON(!map->format.format_write && !map->format.format_val); |
798 | ||
c9157198 | 799 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
800 | ret = regcache_write(map, reg, val); |
801 | if (ret != 0) | |
802 | return ret; | |
8ae0d7e8 MB |
803 | if (map->cache_only) { |
804 | map->cache_dirty = true; | |
5d1729e7 | 805 | return 0; |
8ae0d7e8 | 806 | } |
5d1729e7 DP |
807 | } |
808 | ||
fb2736bb MB |
809 | trace_regmap_reg_write(map->dev, reg, val); |
810 | ||
b83a313b | 811 | if (map->format.format_write) { |
6863ca62 KG |
812 | ret = _regmap_select_page(map, ®, 1); |
813 | if (ret < 0) | |
814 | return ret; | |
815 | ||
b83a313b MB |
816 | map->format.format_write(map, reg, val); |
817 | ||
fb2736bb MB |
818 | trace_regmap_hw_write_start(map->dev, reg, 1); |
819 | ||
0135bbcc | 820 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
821 | map->format.buf_size); |
822 | ||
823 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
824 | ||
825 | return ret; | |
b83a313b | 826 | } else { |
82159ba8 | 827 | map->format.format_val(map->work_buf + map->format.reg_bytes |
d939fb9a | 828 | + map->format.pad_bytes, val, 0); |
b83a313b | 829 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
830 | map->work_buf + |
831 | map->format.reg_bytes + | |
832 | map->format.pad_bytes, | |
b83a313b MB |
833 | map->format.val_bytes); |
834 | } | |
835 | } | |
836 | ||
837 | /** | |
838 | * regmap_write(): Write a value to a single register | |
839 | * | |
840 | * @map: Register map to write to | |
841 | * @reg: Register to write to | |
842 | * @val: Value to be written | |
843 | * | |
844 | * A value of zero will be returned on success, a negative errno will | |
845 | * be returned in error cases. | |
846 | */ | |
847 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
848 | { | |
849 | int ret; | |
850 | ||
f01ee60f SW |
851 | if (reg % map->reg_stride) |
852 | return -EINVAL; | |
853 | ||
bacdbe07 | 854 | map->lock(map); |
b83a313b MB |
855 | |
856 | ret = _regmap_write(map, reg, val); | |
857 | ||
bacdbe07 | 858 | map->unlock(map); |
b83a313b MB |
859 | |
860 | return ret; | |
861 | } | |
862 | EXPORT_SYMBOL_GPL(regmap_write); | |
863 | ||
864 | /** | |
865 | * regmap_raw_write(): Write raw values to one or more registers | |
866 | * | |
867 | * @map: Register map to write to | |
868 | * @reg: Initial register to write to | |
869 | * @val: Block of data to be written, laid out for direct transmission to the | |
870 | * device | |
871 | * @val_len: Length of data pointed to by val. | |
872 | * | |
873 | * This function is intended to be used for things like firmware | |
874 | * download where a large block of data needs to be transferred to the | |
875 | * device. No formatting will be done on the data provided. | |
876 | * | |
877 | * A value of zero will be returned on success, a negative errno will | |
878 | * be returned in error cases. | |
879 | */ | |
880 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
881 | const void *val, size_t val_len) | |
882 | { | |
883 | int ret; | |
884 | ||
851960ba SW |
885 | if (val_len % map->format.val_bytes) |
886 | return -EINVAL; | |
f01ee60f SW |
887 | if (reg % map->reg_stride) |
888 | return -EINVAL; | |
851960ba | 889 | |
bacdbe07 | 890 | map->lock(map); |
b83a313b MB |
891 | |
892 | ret = _regmap_raw_write(map, reg, val, val_len); | |
893 | ||
bacdbe07 | 894 | map->unlock(map); |
b83a313b MB |
895 | |
896 | return ret; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
899 | ||
8eaeb219 LD |
900 | /* |
901 | * regmap_bulk_write(): Write multiple registers to the device | |
902 | * | |
903 | * @map: Register map to write to | |
904 | * @reg: First register to be write from | |
905 | * @val: Block of data to be written, in native register size for device | |
906 | * @val_count: Number of registers to write | |
907 | * | |
908 | * This function is intended to be used for writing a large block of | |
909 | * data to be device either in single transfer or multiple transfer. | |
910 | * | |
911 | * A value of zero will be returned on success, a negative errno will | |
912 | * be returned in error cases. | |
913 | */ | |
914 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
915 | size_t val_count) | |
916 | { | |
917 | int ret = 0, i; | |
918 | size_t val_bytes = map->format.val_bytes; | |
919 | void *wval; | |
920 | ||
921 | if (!map->format.parse_val) | |
922 | return -EINVAL; | |
f01ee60f SW |
923 | if (reg % map->reg_stride) |
924 | return -EINVAL; | |
8eaeb219 | 925 | |
bacdbe07 | 926 | map->lock(map); |
8eaeb219 LD |
927 | |
928 | /* No formatting is require if val_byte is 1 */ | |
929 | if (val_bytes == 1) { | |
930 | wval = (void *)val; | |
931 | } else { | |
932 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
933 | if (!wval) { | |
934 | ret = -ENOMEM; | |
935 | dev_err(map->dev, "Error in memory allocation\n"); | |
936 | goto out; | |
937 | } | |
938 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
939 | map->format.parse_val(wval + i); | |
940 | } | |
2e33caf1 AJ |
941 | /* |
942 | * Some devices does not support bulk write, for | |
943 | * them we have a series of single write operations. | |
944 | */ | |
945 | if (map->use_single_rw) { | |
946 | for (i = 0; i < val_count; i++) { | |
947 | ret = regmap_raw_write(map, | |
948 | reg + (i * map->reg_stride), | |
949 | val + (i * val_bytes), | |
950 | val_bytes); | |
951 | if (ret != 0) | |
952 | return ret; | |
953 | } | |
954 | } else { | |
955 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
956 | } | |
8eaeb219 LD |
957 | |
958 | if (val_bytes != 1) | |
959 | kfree(wval); | |
960 | ||
961 | out: | |
bacdbe07 | 962 | map->unlock(map); |
8eaeb219 LD |
963 | return ret; |
964 | } | |
965 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
966 | ||
b83a313b MB |
967 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
968 | unsigned int val_len) | |
969 | { | |
970 | u8 *u8 = map->work_buf; | |
971 | int ret; | |
972 | ||
6863ca62 KG |
973 | ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes); |
974 | if (ret < 0) | |
975 | return ret; | |
976 | ||
d939fb9a | 977 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b MB |
978 | |
979 | /* | |
6f306441 | 980 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
981 | * register addresss; since it's always the high bits for all |
982 | * current formats we can do this here rather than in | |
983 | * formatting. This may break if we get interesting formats. | |
984 | */ | |
6f306441 | 985 | u8[0] |= map->read_flag_mask; |
b83a313b | 986 | |
fb2736bb MB |
987 | trace_regmap_hw_read_start(map->dev, reg, |
988 | val_len / map->format.val_bytes); | |
989 | ||
0135bbcc | 990 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 991 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 992 | val, val_len); |
b83a313b | 993 | |
fb2736bb MB |
994 | trace_regmap_hw_read_done(map->dev, reg, |
995 | val_len / map->format.val_bytes); | |
996 | ||
997 | return ret; | |
b83a313b MB |
998 | } |
999 | ||
1000 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
1001 | unsigned int *val) | |
1002 | { | |
1003 | int ret; | |
1004 | ||
5d1729e7 DP |
1005 | if (!map->cache_bypass) { |
1006 | ret = regcache_read(map, reg, val); | |
1007 | if (ret == 0) | |
1008 | return 0; | |
1009 | } | |
1010 | ||
19254411 LPC |
1011 | if (!map->format.parse_val) |
1012 | return -EINVAL; | |
1013 | ||
5d1729e7 DP |
1014 | if (map->cache_only) |
1015 | return -EBUSY; | |
1016 | ||
b83a313b | 1017 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 1018 | if (ret == 0) { |
b83a313b | 1019 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
1020 | trace_regmap_reg_read(map->dev, reg, *val); |
1021 | } | |
b83a313b | 1022 | |
f2985367 MB |
1023 | if (ret == 0 && !map->cache_bypass) |
1024 | regcache_write(map, reg, *val); | |
1025 | ||
b83a313b MB |
1026 | return ret; |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * regmap_read(): Read a value from a single register | |
1031 | * | |
1032 | * @map: Register map to write to | |
1033 | * @reg: Register to be read from | |
1034 | * @val: Pointer to store read value | |
1035 | * | |
1036 | * A value of zero will be returned on success, a negative errno will | |
1037 | * be returned in error cases. | |
1038 | */ | |
1039 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
1040 | { | |
1041 | int ret; | |
1042 | ||
f01ee60f SW |
1043 | if (reg % map->reg_stride) |
1044 | return -EINVAL; | |
1045 | ||
bacdbe07 | 1046 | map->lock(map); |
b83a313b MB |
1047 | |
1048 | ret = _regmap_read(map, reg, val); | |
1049 | ||
bacdbe07 | 1050 | map->unlock(map); |
b83a313b MB |
1051 | |
1052 | return ret; | |
1053 | } | |
1054 | EXPORT_SYMBOL_GPL(regmap_read); | |
1055 | ||
1056 | /** | |
1057 | * regmap_raw_read(): Read raw data from the device | |
1058 | * | |
1059 | * @map: Register map to write to | |
1060 | * @reg: First register to be read from | |
1061 | * @val: Pointer to store read value | |
1062 | * @val_len: Size of data to read | |
1063 | * | |
1064 | * A value of zero will be returned on success, a negative errno will | |
1065 | * be returned in error cases. | |
1066 | */ | |
1067 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
1068 | size_t val_len) | |
1069 | { | |
b8fb5ab1 MB |
1070 | size_t val_bytes = map->format.val_bytes; |
1071 | size_t val_count = val_len / val_bytes; | |
1072 | unsigned int v; | |
1073 | int ret, i; | |
04e016ad | 1074 | |
851960ba SW |
1075 | if (val_len % map->format.val_bytes) |
1076 | return -EINVAL; | |
f01ee60f SW |
1077 | if (reg % map->reg_stride) |
1078 | return -EINVAL; | |
851960ba | 1079 | |
bacdbe07 | 1080 | map->lock(map); |
b83a313b | 1081 | |
b8fb5ab1 MB |
1082 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
1083 | map->cache_type == REGCACHE_NONE) { | |
1084 | /* Physical block read if there's no cache involved */ | |
1085 | ret = _regmap_raw_read(map, reg, val, val_len); | |
1086 | ||
1087 | } else { | |
1088 | /* Otherwise go word by word for the cache; should be low | |
1089 | * cost as we expect to hit the cache. | |
1090 | */ | |
1091 | for (i = 0; i < val_count; i++) { | |
f01ee60f SW |
1092 | ret = _regmap_read(map, reg + (i * map->reg_stride), |
1093 | &v); | |
b8fb5ab1 MB |
1094 | if (ret != 0) |
1095 | goto out; | |
1096 | ||
d939fb9a | 1097 | map->format.format_val(val + (i * val_bytes), v, 0); |
b8fb5ab1 MB |
1098 | } |
1099 | } | |
b83a313b | 1100 | |
b8fb5ab1 | 1101 | out: |
bacdbe07 | 1102 | map->unlock(map); |
b83a313b MB |
1103 | |
1104 | return ret; | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
1107 | ||
1108 | /** | |
1109 | * regmap_bulk_read(): Read multiple registers from the device | |
1110 | * | |
1111 | * @map: Register map to write to | |
1112 | * @reg: First register to be read from | |
1113 | * @val: Pointer to store read value, in native register size for device | |
1114 | * @val_count: Number of registers to read | |
1115 | * | |
1116 | * A value of zero will be returned on success, a negative errno will | |
1117 | * be returned in error cases. | |
1118 | */ | |
1119 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
1120 | size_t val_count) | |
1121 | { | |
1122 | int ret, i; | |
1123 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 1124 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 1125 | |
b83a313b MB |
1126 | if (!map->format.parse_val) |
1127 | return -EINVAL; | |
f01ee60f SW |
1128 | if (reg % map->reg_stride) |
1129 | return -EINVAL; | |
b83a313b | 1130 | |
de2d808f | 1131 | if (vol || map->cache_type == REGCACHE_NONE) { |
2e33caf1 AJ |
1132 | /* |
1133 | * Some devices does not support bulk read, for | |
1134 | * them we have a series of single read operations. | |
1135 | */ | |
1136 | if (map->use_single_rw) { | |
1137 | for (i = 0; i < val_count; i++) { | |
1138 | ret = regmap_raw_read(map, | |
1139 | reg + (i * map->reg_stride), | |
1140 | val + (i * val_bytes), | |
1141 | val_bytes); | |
1142 | if (ret != 0) | |
1143 | return ret; | |
1144 | } | |
1145 | } else { | |
1146 | ret = regmap_raw_read(map, reg, val, | |
1147 | val_bytes * val_count); | |
1148 | if (ret != 0) | |
1149 | return ret; | |
1150 | } | |
de2d808f MB |
1151 | |
1152 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
1153 | map->format.parse_val(val + i); | |
1154 | } else { | |
1155 | for (i = 0; i < val_count; i++) { | |
6560ffd1 | 1156 | unsigned int ival; |
f01ee60f | 1157 | ret = regmap_read(map, reg + (i * map->reg_stride), |
25061d28 | 1158 | &ival); |
de2d808f MB |
1159 | if (ret != 0) |
1160 | return ret; | |
6560ffd1 | 1161 | memcpy(val + (i * val_bytes), &ival, val_bytes); |
de2d808f MB |
1162 | } |
1163 | } | |
b83a313b MB |
1164 | |
1165 | return 0; | |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
1168 | ||
018690d3 MB |
1169 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
1170 | unsigned int mask, unsigned int val, | |
1171 | bool *change) | |
b83a313b MB |
1172 | { |
1173 | int ret; | |
d91e8db2 | 1174 | unsigned int tmp, orig; |
b83a313b | 1175 | |
d91e8db2 | 1176 | ret = _regmap_read(map, reg, &orig); |
b83a313b | 1177 | if (ret != 0) |
fc3ebd78 | 1178 | return ret; |
b83a313b | 1179 | |
d91e8db2 | 1180 | tmp = orig & ~mask; |
b83a313b MB |
1181 | tmp |= val & mask; |
1182 | ||
018690d3 | 1183 | if (tmp != orig) { |
d91e8db2 | 1184 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
1185 | *change = true; |
1186 | } else { | |
1187 | *change = false; | |
1188 | } | |
b83a313b | 1189 | |
b83a313b MB |
1190 | return ret; |
1191 | } | |
018690d3 MB |
1192 | |
1193 | /** | |
1194 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
1195 | * | |
1196 | * @map: Register map to update | |
1197 | * @reg: Register to update | |
1198 | * @mask: Bitmask to change | |
1199 | * @val: New value for bitmask | |
1200 | * | |
1201 | * Returns zero for success, a negative number on error. | |
1202 | */ | |
1203 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
1204 | unsigned int mask, unsigned int val) | |
1205 | { | |
1206 | bool change; | |
fc3ebd78 KG |
1207 | int ret; |
1208 | ||
1209 | map->lock(map); | |
1210 | ret = _regmap_update_bits(map, reg, mask, val, &change); | |
1211 | map->unlock(map); | |
1212 | ||
1213 | return ret; | |
018690d3 | 1214 | } |
b83a313b | 1215 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 1216 | |
018690d3 MB |
1217 | /** |
1218 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
1219 | * register map and report if updated | |
1220 | * | |
1221 | * @map: Register map to update | |
1222 | * @reg: Register to update | |
1223 | * @mask: Bitmask to change | |
1224 | * @val: New value for bitmask | |
1225 | * @change: Boolean indicating if a write was done | |
1226 | * | |
1227 | * Returns zero for success, a negative number on error. | |
1228 | */ | |
1229 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
1230 | unsigned int mask, unsigned int val, | |
1231 | bool *change) | |
1232 | { | |
fc3ebd78 KG |
1233 | int ret; |
1234 | ||
1235 | map->lock(map); | |
1236 | ret = _regmap_update_bits(map, reg, mask, val, change); | |
1237 | map->unlock(map); | |
1238 | return ret; | |
018690d3 MB |
1239 | } |
1240 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
1241 | ||
22f0d90a MB |
1242 | /** |
1243 | * regmap_register_patch: Register and apply register updates to be applied | |
1244 | * on device initialistion | |
1245 | * | |
1246 | * @map: Register map to apply updates to. | |
1247 | * @regs: Values to update. | |
1248 | * @num_regs: Number of entries in regs. | |
1249 | * | |
1250 | * Register a set of register updates to be applied to the device | |
1251 | * whenever the device registers are synchronised with the cache and | |
1252 | * apply them immediately. Typically this is used to apply | |
1253 | * corrections to be applied to the device defaults on startup, such | |
1254 | * as the updates some vendors provide to undocumented registers. | |
1255 | */ | |
1256 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
1257 | int num_regs) | |
1258 | { | |
1259 | int i, ret; | |
1260 | bool bypass; | |
1261 | ||
1262 | /* If needed the implementation can be extended to support this */ | |
1263 | if (map->patch) | |
1264 | return -EBUSY; | |
1265 | ||
bacdbe07 | 1266 | map->lock(map); |
22f0d90a MB |
1267 | |
1268 | bypass = map->cache_bypass; | |
1269 | ||
1270 | map->cache_bypass = true; | |
1271 | ||
1272 | /* Write out first; it's useful to apply even if we fail later. */ | |
1273 | for (i = 0; i < num_regs; i++) { | |
1274 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
1275 | if (ret != 0) { | |
1276 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
1277 | regs[i].reg, regs[i].def, ret); | |
1278 | goto out; | |
1279 | } | |
1280 | } | |
1281 | ||
2a14d7d9 | 1282 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
1283 | if (map->patch != NULL) { |
1284 | memcpy(map->patch, regs, | |
1285 | num_regs * sizeof(struct reg_default)); | |
1286 | map->patch_regs = num_regs; | |
1287 | } else { | |
1288 | ret = -ENOMEM; | |
1289 | } | |
1290 | ||
1291 | out: | |
1292 | map->cache_bypass = bypass; | |
1293 | ||
bacdbe07 | 1294 | map->unlock(map); |
22f0d90a MB |
1295 | |
1296 | return ret; | |
1297 | } | |
1298 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
1299 | ||
eae4b51b | 1300 | /* |
a6539c32 MB |
1301 | * regmap_get_val_bytes(): Report the size of a register value |
1302 | * | |
1303 | * Report the size of a register value, mainly intended to for use by | |
1304 | * generic infrastructure built on top of regmap. | |
1305 | */ | |
1306 | int regmap_get_val_bytes(struct regmap *map) | |
1307 | { | |
1308 | if (map->format.format_write) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | return map->format.val_bytes; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
1314 | ||
31244e39 MB |
1315 | static int __init regmap_initcall(void) |
1316 | { | |
1317 | regmap_debugfs_initcall(); | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | postcore_initcall(regmap_initcall); |