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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 | ||
13 | #include <linux/slab.h> | |
19694b5e | 14 | #include <linux/export.h> |
b83a313b MB |
15 | #include <linux/mutex.h> |
16 | #include <linux/err.h> | |
17 | ||
fb2736bb MB |
18 | #define CREATE_TRACE_POINTS |
19 | #include <trace/events/regmap.h> | |
20 | ||
93de9124 | 21 | #include "internal.h" |
b83a313b | 22 | |
8de2f081 MB |
23 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
24 | { | |
25 | if (map->max_register && reg > map->max_register) | |
26 | return false; | |
27 | ||
28 | if (map->writeable_reg) | |
29 | return map->writeable_reg(map->dev, reg); | |
30 | ||
31 | return true; | |
32 | } | |
33 | ||
34 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
35 | { | |
36 | if (map->max_register && reg > map->max_register) | |
37 | return false; | |
38 | ||
4191f197 WS |
39 | if (map->format.format_write) |
40 | return false; | |
41 | ||
8de2f081 MB |
42 | if (map->readable_reg) |
43 | return map->readable_reg(map->dev, reg); | |
44 | ||
45 | return true; | |
46 | } | |
47 | ||
48 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
49 | { | |
4191f197 | 50 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
51 | return false; |
52 | ||
53 | if (map->volatile_reg) | |
54 | return map->volatile_reg(map->dev, reg); | |
55 | ||
56 | return true; | |
57 | } | |
58 | ||
59 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
60 | { | |
4191f197 | 61 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
62 | return false; |
63 | ||
64 | if (map->precious_reg) | |
65 | return map->precious_reg(map->dev, reg); | |
66 | ||
67 | return false; | |
68 | } | |
69 | ||
82cd9965 LPC |
70 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
71 | unsigned int num) | |
72 | { | |
73 | unsigned int i; | |
74 | ||
75 | for (i = 0; i < num; i++) | |
76 | if (!regmap_volatile(map, reg + i)) | |
77 | return false; | |
78 | ||
79 | return true; | |
80 | } | |
81 | ||
9aa50750 WS |
82 | static void regmap_format_2_6_write(struct regmap *map, |
83 | unsigned int reg, unsigned int val) | |
84 | { | |
85 | u8 *out = map->work_buf; | |
86 | ||
87 | *out = (reg << 6) | val; | |
88 | } | |
89 | ||
b83a313b MB |
90 | static void regmap_format_4_12_write(struct regmap *map, |
91 | unsigned int reg, unsigned int val) | |
92 | { | |
93 | __be16 *out = map->work_buf; | |
94 | *out = cpu_to_be16((reg << 12) | val); | |
95 | } | |
96 | ||
97 | static void regmap_format_7_9_write(struct regmap *map, | |
98 | unsigned int reg, unsigned int val) | |
99 | { | |
100 | __be16 *out = map->work_buf; | |
101 | *out = cpu_to_be16((reg << 9) | val); | |
102 | } | |
103 | ||
7e5ec63e LPC |
104 | static void regmap_format_10_14_write(struct regmap *map, |
105 | unsigned int reg, unsigned int val) | |
106 | { | |
107 | u8 *out = map->work_buf; | |
108 | ||
109 | out[2] = val; | |
110 | out[1] = (val >> 8) | (reg << 6); | |
111 | out[0] = reg >> 2; | |
112 | } | |
113 | ||
b83a313b MB |
114 | static void regmap_format_8(void *buf, unsigned int val) |
115 | { | |
116 | u8 *b = buf; | |
117 | ||
118 | b[0] = val; | |
119 | } | |
120 | ||
121 | static void regmap_format_16(void *buf, unsigned int val) | |
122 | { | |
123 | __be16 *b = buf; | |
124 | ||
125 | b[0] = cpu_to_be16(val); | |
126 | } | |
127 | ||
7d5e525b MB |
128 | static void regmap_format_32(void *buf, unsigned int val) |
129 | { | |
130 | __be32 *b = buf; | |
131 | ||
132 | b[0] = cpu_to_be32(val); | |
133 | } | |
134 | ||
b83a313b MB |
135 | static unsigned int regmap_parse_8(void *buf) |
136 | { | |
137 | u8 *b = buf; | |
138 | ||
139 | return b[0]; | |
140 | } | |
141 | ||
142 | static unsigned int regmap_parse_16(void *buf) | |
143 | { | |
144 | __be16 *b = buf; | |
145 | ||
146 | b[0] = be16_to_cpu(b[0]); | |
147 | ||
148 | return b[0]; | |
149 | } | |
150 | ||
7d5e525b MB |
151 | static unsigned int regmap_parse_32(void *buf) |
152 | { | |
153 | __be32 *b = buf; | |
154 | ||
155 | b[0] = be32_to_cpu(b[0]); | |
156 | ||
157 | return b[0]; | |
158 | } | |
159 | ||
b83a313b MB |
160 | /** |
161 | * regmap_init(): Initialise register map | |
162 | * | |
163 | * @dev: Device that will be interacted with | |
164 | * @bus: Bus-specific callbacks to use with device | |
165 | * @config: Configuration for register map | |
166 | * | |
167 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
168 | * a struct regmap. This function should generally not be called | |
169 | * directly, it should be called by bus-specific init functions. | |
170 | */ | |
171 | struct regmap *regmap_init(struct device *dev, | |
172 | const struct regmap_bus *bus, | |
173 | const struct regmap_config *config) | |
174 | { | |
175 | struct regmap *map; | |
176 | int ret = -EINVAL; | |
177 | ||
178 | if (!bus || !config) | |
abbb18fb | 179 | goto err; |
b83a313b MB |
180 | |
181 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
182 | if (map == NULL) { | |
183 | ret = -ENOMEM; | |
184 | goto err; | |
185 | } | |
186 | ||
187 | mutex_init(&map->lock); | |
188 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 189 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 190 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 191 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 192 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
193 | map->dev = dev; |
194 | map->bus = bus; | |
2e2ae66d MB |
195 | map->max_register = config->max_register; |
196 | map->writeable_reg = config->writeable_reg; | |
197 | map->readable_reg = config->readable_reg; | |
198 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 199 | map->precious_reg = config->precious_reg; |
5d1729e7 | 200 | map->cache_type = config->cache_type; |
b83a313b | 201 | |
6f306441 LPC |
202 | if (config->read_flag_mask || config->write_flag_mask) { |
203 | map->read_flag_mask = config->read_flag_mask; | |
204 | map->write_flag_mask = config->write_flag_mask; | |
205 | } else { | |
206 | map->read_flag_mask = bus->read_flag_mask; | |
207 | } | |
208 | ||
b83a313b | 209 | switch (config->reg_bits) { |
9aa50750 WS |
210 | case 2: |
211 | switch (config->val_bits) { | |
212 | case 6: | |
213 | map->format.format_write = regmap_format_2_6_write; | |
214 | break; | |
215 | default: | |
216 | goto err_map; | |
217 | } | |
218 | break; | |
219 | ||
b83a313b MB |
220 | case 4: |
221 | switch (config->val_bits) { | |
222 | case 12: | |
223 | map->format.format_write = regmap_format_4_12_write; | |
224 | break; | |
225 | default: | |
226 | goto err_map; | |
227 | } | |
228 | break; | |
229 | ||
230 | case 7: | |
231 | switch (config->val_bits) { | |
232 | case 9: | |
233 | map->format.format_write = regmap_format_7_9_write; | |
234 | break; | |
235 | default: | |
236 | goto err_map; | |
237 | } | |
238 | break; | |
239 | ||
7e5ec63e LPC |
240 | case 10: |
241 | switch (config->val_bits) { | |
242 | case 14: | |
243 | map->format.format_write = regmap_format_10_14_write; | |
244 | break; | |
245 | default: | |
246 | goto err_map; | |
247 | } | |
248 | break; | |
249 | ||
b83a313b MB |
250 | case 8: |
251 | map->format.format_reg = regmap_format_8; | |
252 | break; | |
253 | ||
254 | case 16: | |
255 | map->format.format_reg = regmap_format_16; | |
256 | break; | |
257 | ||
7d5e525b MB |
258 | case 32: |
259 | map->format.format_reg = regmap_format_32; | |
260 | break; | |
261 | ||
b83a313b MB |
262 | default: |
263 | goto err_map; | |
264 | } | |
265 | ||
266 | switch (config->val_bits) { | |
267 | case 8: | |
268 | map->format.format_val = regmap_format_8; | |
269 | map->format.parse_val = regmap_parse_8; | |
270 | break; | |
271 | case 16: | |
272 | map->format.format_val = regmap_format_16; | |
273 | map->format.parse_val = regmap_parse_16; | |
274 | break; | |
7d5e525b MB |
275 | case 32: |
276 | map->format.format_val = regmap_format_32; | |
277 | map->format.parse_val = regmap_parse_32; | |
278 | break; | |
b83a313b MB |
279 | } |
280 | ||
281 | if (!map->format.format_write && | |
282 | !(map->format.format_reg && map->format.format_val)) | |
283 | goto err_map; | |
284 | ||
82159ba8 | 285 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
286 | if (map->work_buf == NULL) { |
287 | ret = -ENOMEM; | |
5204f5e3 | 288 | goto err_map; |
b83a313b MB |
289 | } |
290 | ||
052d2cd1 MB |
291 | regmap_debugfs_init(map); |
292 | ||
e5e3b8ab | 293 | ret = regcache_init(map, config); |
5d1729e7 | 294 | if (ret < 0) |
58072cbf | 295 | goto err_free_workbuf; |
5d1729e7 | 296 | |
b83a313b MB |
297 | return map; |
298 | ||
58072cbf LPC |
299 | err_free_workbuf: |
300 | kfree(map->work_buf); | |
b83a313b MB |
301 | err_map: |
302 | kfree(map); | |
303 | err: | |
304 | return ERR_PTR(ret); | |
305 | } | |
306 | EXPORT_SYMBOL_GPL(regmap_init); | |
307 | ||
bf315173 MB |
308 | /** |
309 | * regmap_reinit_cache(): Reinitialise the current register cache | |
310 | * | |
311 | * @map: Register map to operate on. | |
312 | * @config: New configuration. Only the cache data will be used. | |
313 | * | |
314 | * Discard any existing register cache for the map and initialize a | |
315 | * new cache. This can be used to restore the cache to defaults or to | |
316 | * update the cache configuration to reflect runtime discovery of the | |
317 | * hardware. | |
318 | */ | |
319 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | mutex_lock(&map->lock); | |
324 | ||
325 | regcache_exit(map); | |
a24f64a6 | 326 | regmap_debugfs_exit(map); |
bf315173 MB |
327 | |
328 | map->max_register = config->max_register; | |
329 | map->writeable_reg = config->writeable_reg; | |
330 | map->readable_reg = config->readable_reg; | |
331 | map->volatile_reg = config->volatile_reg; | |
332 | map->precious_reg = config->precious_reg; | |
333 | map->cache_type = config->cache_type; | |
334 | ||
a24f64a6 MB |
335 | regmap_debugfs_init(map); |
336 | ||
bf315173 MB |
337 | ret = regcache_init(map, config); |
338 | ||
339 | mutex_unlock(&map->lock); | |
340 | ||
341 | return ret; | |
342 | } | |
343 | ||
b83a313b MB |
344 | /** |
345 | * regmap_exit(): Free a previously allocated register map | |
346 | */ | |
347 | void regmap_exit(struct regmap *map) | |
348 | { | |
5d1729e7 | 349 | regcache_exit(map); |
31244e39 | 350 | regmap_debugfs_exit(map); |
b83a313b | 351 | kfree(map->work_buf); |
b83a313b MB |
352 | kfree(map); |
353 | } | |
354 | EXPORT_SYMBOL_GPL(regmap_exit); | |
355 | ||
356 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
357 | const void *val, size_t val_len) | |
358 | { | |
6f306441 | 359 | u8 *u8 = map->work_buf; |
b83a313b MB |
360 | void *buf; |
361 | int ret = -ENOTSUPP; | |
362 | size_t len; | |
73304781 MB |
363 | int i; |
364 | ||
365 | /* Check for unwritable registers before we start */ | |
366 | if (map->writeable_reg) | |
367 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
368 | if (!map->writeable_reg(map->dev, reg + i)) | |
369 | return -EINVAL; | |
b83a313b MB |
370 | |
371 | map->format.format_reg(map->work_buf, reg); | |
372 | ||
6f306441 LPC |
373 | u8[0] |= map->write_flag_mask; |
374 | ||
fb2736bb MB |
375 | trace_regmap_hw_write_start(map->dev, reg, |
376 | val_len / map->format.val_bytes); | |
377 | ||
2547e201 MB |
378 | /* If we're doing a single register write we can probably just |
379 | * send the work_buf directly, otherwise try to do a gather | |
380 | * write. | |
381 | */ | |
82159ba8 MB |
382 | if (val == (map->work_buf + map->format.pad_bytes + |
383 | map->format.reg_bytes)) | |
2547e201 | 384 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
385 | map->format.reg_bytes + |
386 | map->format.pad_bytes + | |
387 | val_len); | |
2547e201 | 388 | else if (map->bus->gather_write) |
b83a313b | 389 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
390 | map->format.reg_bytes + |
391 | map->format.pad_bytes, | |
b83a313b MB |
392 | val, val_len); |
393 | ||
2547e201 | 394 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 395 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
396 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
397 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
398 | if (!buf) |
399 | return -ENOMEM; | |
400 | ||
401 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
402 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
403 | val, val_len); | |
b83a313b MB |
404 | ret = map->bus->write(map->dev, buf, len); |
405 | ||
406 | kfree(buf); | |
407 | } | |
408 | ||
fb2736bb MB |
409 | trace_regmap_hw_write_done(map->dev, reg, |
410 | val_len / map->format.val_bytes); | |
411 | ||
b83a313b MB |
412 | return ret; |
413 | } | |
414 | ||
4d2dc095 DP |
415 | int _regmap_write(struct regmap *map, unsigned int reg, |
416 | unsigned int val) | |
b83a313b | 417 | { |
fb2736bb | 418 | int ret; |
b83a313b MB |
419 | BUG_ON(!map->format.format_write && !map->format.format_val); |
420 | ||
5d1729e7 DP |
421 | if (!map->cache_bypass) { |
422 | ret = regcache_write(map, reg, val); | |
423 | if (ret != 0) | |
424 | return ret; | |
8ae0d7e8 MB |
425 | if (map->cache_only) { |
426 | map->cache_dirty = true; | |
5d1729e7 | 427 | return 0; |
8ae0d7e8 | 428 | } |
5d1729e7 DP |
429 | } |
430 | ||
fb2736bb MB |
431 | trace_regmap_reg_write(map->dev, reg, val); |
432 | ||
b83a313b MB |
433 | if (map->format.format_write) { |
434 | map->format.format_write(map, reg, val); | |
435 | ||
fb2736bb MB |
436 | trace_regmap_hw_write_start(map->dev, reg, 1); |
437 | ||
438 | ret = map->bus->write(map->dev, map->work_buf, | |
439 | map->format.buf_size); | |
440 | ||
441 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
442 | ||
443 | return ret; | |
b83a313b | 444 | } else { |
82159ba8 MB |
445 | map->format.format_val(map->work_buf + map->format.reg_bytes |
446 | + map->format.pad_bytes, val); | |
b83a313b | 447 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
448 | map->work_buf + |
449 | map->format.reg_bytes + | |
450 | map->format.pad_bytes, | |
b83a313b MB |
451 | map->format.val_bytes); |
452 | } | |
453 | } | |
454 | ||
455 | /** | |
456 | * regmap_write(): Write a value to a single register | |
457 | * | |
458 | * @map: Register map to write to | |
459 | * @reg: Register to write to | |
460 | * @val: Value to be written | |
461 | * | |
462 | * A value of zero will be returned on success, a negative errno will | |
463 | * be returned in error cases. | |
464 | */ | |
465 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
466 | { | |
467 | int ret; | |
468 | ||
469 | mutex_lock(&map->lock); | |
470 | ||
471 | ret = _regmap_write(map, reg, val); | |
472 | ||
473 | mutex_unlock(&map->lock); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(regmap_write); | |
478 | ||
479 | /** | |
480 | * regmap_raw_write(): Write raw values to one or more registers | |
481 | * | |
482 | * @map: Register map to write to | |
483 | * @reg: Initial register to write to | |
484 | * @val: Block of data to be written, laid out for direct transmission to the | |
485 | * device | |
486 | * @val_len: Length of data pointed to by val. | |
487 | * | |
488 | * This function is intended to be used for things like firmware | |
489 | * download where a large block of data needs to be transferred to the | |
490 | * device. No formatting will be done on the data provided. | |
491 | * | |
492 | * A value of zero will be returned on success, a negative errno will | |
493 | * be returned in error cases. | |
494 | */ | |
495 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
496 | const void *val, size_t val_len) | |
497 | { | |
c48a9d74 | 498 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b MB |
499 | int ret; |
500 | ||
c48a9d74 LPC |
501 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
502 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 503 | |
b83a313b MB |
504 | mutex_lock(&map->lock); |
505 | ||
506 | ret = _regmap_raw_write(map, reg, val, val_len); | |
507 | ||
508 | mutex_unlock(&map->lock); | |
509 | ||
510 | return ret; | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
513 | ||
514 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
515 | unsigned int val_len) | |
516 | { | |
517 | u8 *u8 = map->work_buf; | |
518 | int ret; | |
519 | ||
520 | map->format.format_reg(map->work_buf, reg); | |
521 | ||
522 | /* | |
6f306441 | 523 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
524 | * register addresss; since it's always the high bits for all |
525 | * current formats we can do this here rather than in | |
526 | * formatting. This may break if we get interesting formats. | |
527 | */ | |
6f306441 | 528 | u8[0] |= map->read_flag_mask; |
b83a313b | 529 | |
fb2736bb MB |
530 | trace_regmap_hw_read_start(map->dev, reg, |
531 | val_len / map->format.val_bytes); | |
532 | ||
82159ba8 MB |
533 | ret = map->bus->read(map->dev, map->work_buf, |
534 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 535 | val, val_len); |
b83a313b | 536 | |
fb2736bb MB |
537 | trace_regmap_hw_read_done(map->dev, reg, |
538 | val_len / map->format.val_bytes); | |
539 | ||
540 | return ret; | |
b83a313b MB |
541 | } |
542 | ||
543 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
544 | unsigned int *val) | |
545 | { | |
546 | int ret; | |
547 | ||
5d1729e7 DP |
548 | if (!map->cache_bypass) { |
549 | ret = regcache_read(map, reg, val); | |
550 | if (ret == 0) | |
551 | return 0; | |
552 | } | |
553 | ||
19254411 LPC |
554 | if (!map->format.parse_val) |
555 | return -EINVAL; | |
556 | ||
5d1729e7 DP |
557 | if (map->cache_only) |
558 | return -EBUSY; | |
559 | ||
b83a313b | 560 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 561 | if (ret == 0) { |
b83a313b | 562 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
563 | trace_regmap_reg_read(map->dev, reg, *val); |
564 | } | |
b83a313b MB |
565 | |
566 | return ret; | |
567 | } | |
568 | ||
569 | /** | |
570 | * regmap_read(): Read a value from a single register | |
571 | * | |
572 | * @map: Register map to write to | |
573 | * @reg: Register to be read from | |
574 | * @val: Pointer to store read value | |
575 | * | |
576 | * A value of zero will be returned on success, a negative errno will | |
577 | * be returned in error cases. | |
578 | */ | |
579 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
580 | { | |
581 | int ret; | |
582 | ||
583 | mutex_lock(&map->lock); | |
584 | ||
585 | ret = _regmap_read(map, reg, val); | |
586 | ||
587 | mutex_unlock(&map->lock); | |
588 | ||
589 | return ret; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(regmap_read); | |
592 | ||
593 | /** | |
594 | * regmap_raw_read(): Read raw data from the device | |
595 | * | |
596 | * @map: Register map to write to | |
597 | * @reg: First register to be read from | |
598 | * @val: Pointer to store read value | |
599 | * @val_len: Size of data to read | |
600 | * | |
601 | * A value of zero will be returned on success, a negative errno will | |
602 | * be returned in error cases. | |
603 | */ | |
604 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
605 | size_t val_len) | |
606 | { | |
b8fb5ab1 MB |
607 | size_t val_bytes = map->format.val_bytes; |
608 | size_t val_count = val_len / val_bytes; | |
609 | unsigned int v; | |
610 | int ret, i; | |
04e016ad | 611 | |
b83a313b MB |
612 | mutex_lock(&map->lock); |
613 | ||
b8fb5ab1 MB |
614 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
615 | map->cache_type == REGCACHE_NONE) { | |
616 | /* Physical block read if there's no cache involved */ | |
617 | ret = _regmap_raw_read(map, reg, val, val_len); | |
618 | ||
619 | } else { | |
620 | /* Otherwise go word by word for the cache; should be low | |
621 | * cost as we expect to hit the cache. | |
622 | */ | |
623 | for (i = 0; i < val_count; i++) { | |
624 | ret = _regmap_read(map, reg + i, &v); | |
625 | if (ret != 0) | |
626 | goto out; | |
627 | ||
628 | map->format.format_val(val + (i * val_bytes), v); | |
629 | } | |
630 | } | |
b83a313b | 631 | |
b8fb5ab1 | 632 | out: |
b83a313b MB |
633 | mutex_unlock(&map->lock); |
634 | ||
635 | return ret; | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
638 | ||
639 | /** | |
640 | * regmap_bulk_read(): Read multiple registers from the device | |
641 | * | |
642 | * @map: Register map to write to | |
643 | * @reg: First register to be read from | |
644 | * @val: Pointer to store read value, in native register size for device | |
645 | * @val_count: Number of registers to read | |
646 | * | |
647 | * A value of zero will be returned on success, a negative errno will | |
648 | * be returned in error cases. | |
649 | */ | |
650 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
651 | size_t val_count) | |
652 | { | |
653 | int ret, i; | |
654 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 655 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 656 | |
b83a313b MB |
657 | if (!map->format.parse_val) |
658 | return -EINVAL; | |
659 | ||
de2d808f MB |
660 | if (vol || map->cache_type == REGCACHE_NONE) { |
661 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
662 | if (ret != 0) | |
663 | return ret; | |
664 | ||
665 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
666 | map->format.parse_val(val + i); | |
667 | } else { | |
668 | for (i = 0; i < val_count; i++) { | |
669 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
670 | if (ret != 0) | |
671 | return ret; | |
672 | } | |
673 | } | |
b83a313b MB |
674 | |
675 | return 0; | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
678 | ||
018690d3 MB |
679 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
680 | unsigned int mask, unsigned int val, | |
681 | bool *change) | |
b83a313b MB |
682 | { |
683 | int ret; | |
d91e8db2 | 684 | unsigned int tmp, orig; |
b83a313b MB |
685 | |
686 | mutex_lock(&map->lock); | |
687 | ||
d91e8db2 | 688 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
689 | if (ret != 0) |
690 | goto out; | |
691 | ||
d91e8db2 | 692 | tmp = orig & ~mask; |
b83a313b MB |
693 | tmp |= val & mask; |
694 | ||
018690d3 | 695 | if (tmp != orig) { |
d91e8db2 | 696 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
697 | *change = true; |
698 | } else { | |
699 | *change = false; | |
700 | } | |
b83a313b MB |
701 | |
702 | out: | |
703 | mutex_unlock(&map->lock); | |
704 | ||
705 | return ret; | |
706 | } | |
018690d3 MB |
707 | |
708 | /** | |
709 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
710 | * | |
711 | * @map: Register map to update | |
712 | * @reg: Register to update | |
713 | * @mask: Bitmask to change | |
714 | * @val: New value for bitmask | |
715 | * | |
716 | * Returns zero for success, a negative number on error. | |
717 | */ | |
718 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
719 | unsigned int mask, unsigned int val) | |
720 | { | |
721 | bool change; | |
722 | return _regmap_update_bits(map, reg, mask, val, &change); | |
723 | } | |
b83a313b | 724 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 725 | |
018690d3 MB |
726 | /** |
727 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
728 | * register map and report if updated | |
729 | * | |
730 | * @map: Register map to update | |
731 | * @reg: Register to update | |
732 | * @mask: Bitmask to change | |
733 | * @val: New value for bitmask | |
734 | * @change: Boolean indicating if a write was done | |
735 | * | |
736 | * Returns zero for success, a negative number on error. | |
737 | */ | |
738 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
739 | unsigned int mask, unsigned int val, | |
740 | bool *change) | |
741 | { | |
742 | return _regmap_update_bits(map, reg, mask, val, change); | |
743 | } | |
744 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
745 | ||
31244e39 MB |
746 | static int __init regmap_initcall(void) |
747 | { | |
748 | regmap_debugfs_initcall(); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | postcore_initcall(regmap_initcall); |