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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> | |
18 | ||
fb2736bb MB |
19 | #define CREATE_TRACE_POINTS |
20 | #include <trace/events/regmap.h> | |
21 | ||
93de9124 | 22 | #include "internal.h" |
b83a313b | 23 | |
8de2f081 MB |
24 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
25 | { | |
26 | if (map->max_register && reg > map->max_register) | |
27 | return false; | |
28 | ||
29 | if (map->writeable_reg) | |
30 | return map->writeable_reg(map->dev, reg); | |
31 | ||
32 | return true; | |
33 | } | |
34 | ||
35 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
36 | { | |
37 | if (map->max_register && reg > map->max_register) | |
38 | return false; | |
39 | ||
4191f197 WS |
40 | if (map->format.format_write) |
41 | return false; | |
42 | ||
8de2f081 MB |
43 | if (map->readable_reg) |
44 | return map->readable_reg(map->dev, reg); | |
45 | ||
46 | return true; | |
47 | } | |
48 | ||
49 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
50 | { | |
4191f197 | 51 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
52 | return false; |
53 | ||
54 | if (map->volatile_reg) | |
55 | return map->volatile_reg(map->dev, reg); | |
56 | ||
57 | return true; | |
58 | } | |
59 | ||
60 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
61 | { | |
4191f197 | 62 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
63 | return false; |
64 | ||
65 | if (map->precious_reg) | |
66 | return map->precious_reg(map->dev, reg); | |
67 | ||
68 | return false; | |
69 | } | |
70 | ||
82cd9965 LPC |
71 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
72 | unsigned int num) | |
73 | { | |
74 | unsigned int i; | |
75 | ||
76 | for (i = 0; i < num; i++) | |
77 | if (!regmap_volatile(map, reg + i)) | |
78 | return false; | |
79 | ||
80 | return true; | |
81 | } | |
82 | ||
9aa50750 WS |
83 | static void regmap_format_2_6_write(struct regmap *map, |
84 | unsigned int reg, unsigned int val) | |
85 | { | |
86 | u8 *out = map->work_buf; | |
87 | ||
88 | *out = (reg << 6) | val; | |
89 | } | |
90 | ||
b83a313b MB |
91 | static void regmap_format_4_12_write(struct regmap *map, |
92 | unsigned int reg, unsigned int val) | |
93 | { | |
94 | __be16 *out = map->work_buf; | |
95 | *out = cpu_to_be16((reg << 12) | val); | |
96 | } | |
97 | ||
98 | static void regmap_format_7_9_write(struct regmap *map, | |
99 | unsigned int reg, unsigned int val) | |
100 | { | |
101 | __be16 *out = map->work_buf; | |
102 | *out = cpu_to_be16((reg << 9) | val); | |
103 | } | |
104 | ||
7e5ec63e LPC |
105 | static void regmap_format_10_14_write(struct regmap *map, |
106 | unsigned int reg, unsigned int val) | |
107 | { | |
108 | u8 *out = map->work_buf; | |
109 | ||
110 | out[2] = val; | |
111 | out[1] = (val >> 8) | (reg << 6); | |
112 | out[0] = reg >> 2; | |
113 | } | |
114 | ||
b83a313b MB |
115 | static void regmap_format_8(void *buf, unsigned int val) |
116 | { | |
117 | u8 *b = buf; | |
118 | ||
119 | b[0] = val; | |
120 | } | |
121 | ||
122 | static void regmap_format_16(void *buf, unsigned int val) | |
123 | { | |
124 | __be16 *b = buf; | |
125 | ||
126 | b[0] = cpu_to_be16(val); | |
127 | } | |
128 | ||
7d5e525b MB |
129 | static void regmap_format_32(void *buf, unsigned int val) |
130 | { | |
131 | __be32 *b = buf; | |
132 | ||
133 | b[0] = cpu_to_be32(val); | |
134 | } | |
135 | ||
b83a313b MB |
136 | static unsigned int regmap_parse_8(void *buf) |
137 | { | |
138 | u8 *b = buf; | |
139 | ||
140 | return b[0]; | |
141 | } | |
142 | ||
143 | static unsigned int regmap_parse_16(void *buf) | |
144 | { | |
145 | __be16 *b = buf; | |
146 | ||
147 | b[0] = be16_to_cpu(b[0]); | |
148 | ||
149 | return b[0]; | |
150 | } | |
151 | ||
7d5e525b MB |
152 | static unsigned int regmap_parse_32(void *buf) |
153 | { | |
154 | __be32 *b = buf; | |
155 | ||
156 | b[0] = be32_to_cpu(b[0]); | |
157 | ||
158 | return b[0]; | |
159 | } | |
160 | ||
b83a313b MB |
161 | /** |
162 | * regmap_init(): Initialise register map | |
163 | * | |
164 | * @dev: Device that will be interacted with | |
165 | * @bus: Bus-specific callbacks to use with device | |
166 | * @config: Configuration for register map | |
167 | * | |
168 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
169 | * a struct regmap. This function should generally not be called | |
170 | * directly, it should be called by bus-specific init functions. | |
171 | */ | |
172 | struct regmap *regmap_init(struct device *dev, | |
173 | const struct regmap_bus *bus, | |
174 | const struct regmap_config *config) | |
175 | { | |
176 | struct regmap *map; | |
177 | int ret = -EINVAL; | |
178 | ||
179 | if (!bus || !config) | |
abbb18fb | 180 | goto err; |
b83a313b MB |
181 | |
182 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
183 | if (map == NULL) { | |
184 | ret = -ENOMEM; | |
185 | goto err; | |
186 | } | |
187 | ||
188 | mutex_init(&map->lock); | |
189 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 190 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 191 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 192 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 193 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
194 | map->dev = dev; |
195 | map->bus = bus; | |
2e2ae66d MB |
196 | map->max_register = config->max_register; |
197 | map->writeable_reg = config->writeable_reg; | |
198 | map->readable_reg = config->readable_reg; | |
199 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 200 | map->precious_reg = config->precious_reg; |
5d1729e7 | 201 | map->cache_type = config->cache_type; |
b83a313b | 202 | |
6f306441 LPC |
203 | if (config->read_flag_mask || config->write_flag_mask) { |
204 | map->read_flag_mask = config->read_flag_mask; | |
205 | map->write_flag_mask = config->write_flag_mask; | |
206 | } else { | |
207 | map->read_flag_mask = bus->read_flag_mask; | |
208 | } | |
209 | ||
b83a313b | 210 | switch (config->reg_bits) { |
9aa50750 WS |
211 | case 2: |
212 | switch (config->val_bits) { | |
213 | case 6: | |
214 | map->format.format_write = regmap_format_2_6_write; | |
215 | break; | |
216 | default: | |
217 | goto err_map; | |
218 | } | |
219 | break; | |
220 | ||
b83a313b MB |
221 | case 4: |
222 | switch (config->val_bits) { | |
223 | case 12: | |
224 | map->format.format_write = regmap_format_4_12_write; | |
225 | break; | |
226 | default: | |
227 | goto err_map; | |
228 | } | |
229 | break; | |
230 | ||
231 | case 7: | |
232 | switch (config->val_bits) { | |
233 | case 9: | |
234 | map->format.format_write = regmap_format_7_9_write; | |
235 | break; | |
236 | default: | |
237 | goto err_map; | |
238 | } | |
239 | break; | |
240 | ||
7e5ec63e LPC |
241 | case 10: |
242 | switch (config->val_bits) { | |
243 | case 14: | |
244 | map->format.format_write = regmap_format_10_14_write; | |
245 | break; | |
246 | default: | |
247 | goto err_map; | |
248 | } | |
249 | break; | |
250 | ||
b83a313b MB |
251 | case 8: |
252 | map->format.format_reg = regmap_format_8; | |
253 | break; | |
254 | ||
255 | case 16: | |
256 | map->format.format_reg = regmap_format_16; | |
257 | break; | |
258 | ||
7d5e525b MB |
259 | case 32: |
260 | map->format.format_reg = regmap_format_32; | |
261 | break; | |
262 | ||
b83a313b MB |
263 | default: |
264 | goto err_map; | |
265 | } | |
266 | ||
267 | switch (config->val_bits) { | |
268 | case 8: | |
269 | map->format.format_val = regmap_format_8; | |
270 | map->format.parse_val = regmap_parse_8; | |
271 | break; | |
272 | case 16: | |
273 | map->format.format_val = regmap_format_16; | |
274 | map->format.parse_val = regmap_parse_16; | |
275 | break; | |
7d5e525b MB |
276 | case 32: |
277 | map->format.format_val = regmap_format_32; | |
278 | map->format.parse_val = regmap_parse_32; | |
279 | break; | |
b83a313b MB |
280 | } |
281 | ||
282 | if (!map->format.format_write && | |
283 | !(map->format.format_reg && map->format.format_val)) | |
284 | goto err_map; | |
285 | ||
82159ba8 | 286 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
287 | if (map->work_buf == NULL) { |
288 | ret = -ENOMEM; | |
5204f5e3 | 289 | goto err_map; |
b83a313b MB |
290 | } |
291 | ||
052d2cd1 MB |
292 | regmap_debugfs_init(map); |
293 | ||
e5e3b8ab | 294 | ret = regcache_init(map, config); |
5d1729e7 | 295 | if (ret < 0) |
58072cbf | 296 | goto err_free_workbuf; |
5d1729e7 | 297 | |
b83a313b MB |
298 | return map; |
299 | ||
58072cbf LPC |
300 | err_free_workbuf: |
301 | kfree(map->work_buf); | |
b83a313b MB |
302 | err_map: |
303 | kfree(map); | |
304 | err: | |
305 | return ERR_PTR(ret); | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(regmap_init); | |
308 | ||
c0eb4676 MB |
309 | static void devm_regmap_release(struct device *dev, void *res) |
310 | { | |
311 | regmap_exit(*(struct regmap **)res); | |
312 | } | |
313 | ||
314 | /** | |
315 | * devm_regmap_init(): Initialise managed register map | |
316 | * | |
317 | * @dev: Device that will be interacted with | |
318 | * @bus: Bus-specific callbacks to use with device | |
319 | * @config: Configuration for register map | |
320 | * | |
321 | * The return value will be an ERR_PTR() on error or a valid pointer | |
322 | * to a struct regmap. This function should generally not be called | |
323 | * directly, it should be called by bus-specific init functions. The | |
324 | * map will be automatically freed by the device management code. | |
325 | */ | |
326 | struct regmap *devm_regmap_init(struct device *dev, | |
327 | const struct regmap_bus *bus, | |
328 | const struct regmap_config *config) | |
329 | { | |
330 | struct regmap **ptr, *regmap; | |
331 | ||
332 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
333 | if (!ptr) | |
334 | return ERR_PTR(-ENOMEM); | |
335 | ||
336 | regmap = regmap_init(dev, bus, config); | |
337 | if (!IS_ERR(regmap)) { | |
338 | *ptr = regmap; | |
339 | devres_add(dev, ptr); | |
340 | } else { | |
341 | devres_free(ptr); | |
342 | } | |
343 | ||
344 | return regmap; | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
347 | ||
bf315173 MB |
348 | /** |
349 | * regmap_reinit_cache(): Reinitialise the current register cache | |
350 | * | |
351 | * @map: Register map to operate on. | |
352 | * @config: New configuration. Only the cache data will be used. | |
353 | * | |
354 | * Discard any existing register cache for the map and initialize a | |
355 | * new cache. This can be used to restore the cache to defaults or to | |
356 | * update the cache configuration to reflect runtime discovery of the | |
357 | * hardware. | |
358 | */ | |
359 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
360 | { | |
361 | int ret; | |
362 | ||
363 | mutex_lock(&map->lock); | |
364 | ||
365 | regcache_exit(map); | |
a24f64a6 | 366 | regmap_debugfs_exit(map); |
bf315173 MB |
367 | |
368 | map->max_register = config->max_register; | |
369 | map->writeable_reg = config->writeable_reg; | |
370 | map->readable_reg = config->readable_reg; | |
371 | map->volatile_reg = config->volatile_reg; | |
372 | map->precious_reg = config->precious_reg; | |
373 | map->cache_type = config->cache_type; | |
374 | ||
a24f64a6 MB |
375 | regmap_debugfs_init(map); |
376 | ||
421e8d2d MB |
377 | map->cache_bypass = false; |
378 | map->cache_only = false; | |
379 | ||
bf315173 MB |
380 | ret = regcache_init(map, config); |
381 | ||
382 | mutex_unlock(&map->lock); | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
b83a313b MB |
387 | /** |
388 | * regmap_exit(): Free a previously allocated register map | |
389 | */ | |
390 | void regmap_exit(struct regmap *map) | |
391 | { | |
5d1729e7 | 392 | regcache_exit(map); |
31244e39 | 393 | regmap_debugfs_exit(map); |
b83a313b | 394 | kfree(map->work_buf); |
b83a313b MB |
395 | kfree(map); |
396 | } | |
397 | EXPORT_SYMBOL_GPL(regmap_exit); | |
398 | ||
399 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
400 | const void *val, size_t val_len) | |
401 | { | |
6f306441 | 402 | u8 *u8 = map->work_buf; |
b83a313b MB |
403 | void *buf; |
404 | int ret = -ENOTSUPP; | |
405 | size_t len; | |
73304781 MB |
406 | int i; |
407 | ||
408 | /* Check for unwritable registers before we start */ | |
409 | if (map->writeable_reg) | |
410 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
411 | if (!map->writeable_reg(map->dev, reg + i)) | |
412 | return -EINVAL; | |
b83a313b MB |
413 | |
414 | map->format.format_reg(map->work_buf, reg); | |
415 | ||
6f306441 LPC |
416 | u8[0] |= map->write_flag_mask; |
417 | ||
fb2736bb MB |
418 | trace_regmap_hw_write_start(map->dev, reg, |
419 | val_len / map->format.val_bytes); | |
420 | ||
2547e201 MB |
421 | /* If we're doing a single register write we can probably just |
422 | * send the work_buf directly, otherwise try to do a gather | |
423 | * write. | |
424 | */ | |
82159ba8 MB |
425 | if (val == (map->work_buf + map->format.pad_bytes + |
426 | map->format.reg_bytes)) | |
2547e201 | 427 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
428 | map->format.reg_bytes + |
429 | map->format.pad_bytes + | |
430 | val_len); | |
2547e201 | 431 | else if (map->bus->gather_write) |
b83a313b | 432 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
433 | map->format.reg_bytes + |
434 | map->format.pad_bytes, | |
b83a313b MB |
435 | val, val_len); |
436 | ||
2547e201 | 437 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 438 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
439 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
440 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
441 | if (!buf) |
442 | return -ENOMEM; | |
443 | ||
444 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
445 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
446 | val, val_len); | |
b83a313b MB |
447 | ret = map->bus->write(map->dev, buf, len); |
448 | ||
449 | kfree(buf); | |
450 | } | |
451 | ||
fb2736bb MB |
452 | trace_regmap_hw_write_done(map->dev, reg, |
453 | val_len / map->format.val_bytes); | |
454 | ||
b83a313b MB |
455 | return ret; |
456 | } | |
457 | ||
4d2dc095 DP |
458 | int _regmap_write(struct regmap *map, unsigned int reg, |
459 | unsigned int val) | |
b83a313b | 460 | { |
fb2736bb | 461 | int ret; |
b83a313b MB |
462 | BUG_ON(!map->format.format_write && !map->format.format_val); |
463 | ||
5d1729e7 DP |
464 | if (!map->cache_bypass) { |
465 | ret = regcache_write(map, reg, val); | |
466 | if (ret != 0) | |
467 | return ret; | |
8ae0d7e8 MB |
468 | if (map->cache_only) { |
469 | map->cache_dirty = true; | |
5d1729e7 | 470 | return 0; |
8ae0d7e8 | 471 | } |
5d1729e7 DP |
472 | } |
473 | ||
fb2736bb MB |
474 | trace_regmap_reg_write(map->dev, reg, val); |
475 | ||
b83a313b MB |
476 | if (map->format.format_write) { |
477 | map->format.format_write(map, reg, val); | |
478 | ||
fb2736bb MB |
479 | trace_regmap_hw_write_start(map->dev, reg, 1); |
480 | ||
481 | ret = map->bus->write(map->dev, map->work_buf, | |
482 | map->format.buf_size); | |
483 | ||
484 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
485 | ||
486 | return ret; | |
b83a313b | 487 | } else { |
82159ba8 MB |
488 | map->format.format_val(map->work_buf + map->format.reg_bytes |
489 | + map->format.pad_bytes, val); | |
b83a313b | 490 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
491 | map->work_buf + |
492 | map->format.reg_bytes + | |
493 | map->format.pad_bytes, | |
b83a313b MB |
494 | map->format.val_bytes); |
495 | } | |
496 | } | |
497 | ||
498 | /** | |
499 | * regmap_write(): Write a value to a single register | |
500 | * | |
501 | * @map: Register map to write to | |
502 | * @reg: Register to write to | |
503 | * @val: Value to be written | |
504 | * | |
505 | * A value of zero will be returned on success, a negative errno will | |
506 | * be returned in error cases. | |
507 | */ | |
508 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
509 | { | |
510 | int ret; | |
511 | ||
512 | mutex_lock(&map->lock); | |
513 | ||
514 | ret = _regmap_write(map, reg, val); | |
515 | ||
516 | mutex_unlock(&map->lock); | |
517 | ||
518 | return ret; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(regmap_write); | |
521 | ||
522 | /** | |
523 | * regmap_raw_write(): Write raw values to one or more registers | |
524 | * | |
525 | * @map: Register map to write to | |
526 | * @reg: Initial register to write to | |
527 | * @val: Block of data to be written, laid out for direct transmission to the | |
528 | * device | |
529 | * @val_len: Length of data pointed to by val. | |
530 | * | |
531 | * This function is intended to be used for things like firmware | |
532 | * download where a large block of data needs to be transferred to the | |
533 | * device. No formatting will be done on the data provided. | |
534 | * | |
535 | * A value of zero will be returned on success, a negative errno will | |
536 | * be returned in error cases. | |
537 | */ | |
538 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
539 | const void *val, size_t val_len) | |
540 | { | |
c48a9d74 | 541 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b MB |
542 | int ret; |
543 | ||
c48a9d74 LPC |
544 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
545 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 546 | |
b83a313b MB |
547 | mutex_lock(&map->lock); |
548 | ||
549 | ret = _regmap_raw_write(map, reg, val, val_len); | |
550 | ||
551 | mutex_unlock(&map->lock); | |
552 | ||
553 | return ret; | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
556 | ||
557 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
558 | unsigned int val_len) | |
559 | { | |
560 | u8 *u8 = map->work_buf; | |
561 | int ret; | |
562 | ||
563 | map->format.format_reg(map->work_buf, reg); | |
564 | ||
565 | /* | |
6f306441 | 566 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
567 | * register addresss; since it's always the high bits for all |
568 | * current formats we can do this here rather than in | |
569 | * formatting. This may break if we get interesting formats. | |
570 | */ | |
6f306441 | 571 | u8[0] |= map->read_flag_mask; |
b83a313b | 572 | |
fb2736bb MB |
573 | trace_regmap_hw_read_start(map->dev, reg, |
574 | val_len / map->format.val_bytes); | |
575 | ||
82159ba8 MB |
576 | ret = map->bus->read(map->dev, map->work_buf, |
577 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 578 | val, val_len); |
b83a313b | 579 | |
fb2736bb MB |
580 | trace_regmap_hw_read_done(map->dev, reg, |
581 | val_len / map->format.val_bytes); | |
582 | ||
583 | return ret; | |
b83a313b MB |
584 | } |
585 | ||
586 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
587 | unsigned int *val) | |
588 | { | |
589 | int ret; | |
590 | ||
5d1729e7 DP |
591 | if (!map->cache_bypass) { |
592 | ret = regcache_read(map, reg, val); | |
593 | if (ret == 0) | |
594 | return 0; | |
595 | } | |
596 | ||
19254411 LPC |
597 | if (!map->format.parse_val) |
598 | return -EINVAL; | |
599 | ||
5d1729e7 DP |
600 | if (map->cache_only) |
601 | return -EBUSY; | |
602 | ||
b83a313b | 603 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 604 | if (ret == 0) { |
b83a313b | 605 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
606 | trace_regmap_reg_read(map->dev, reg, *val); |
607 | } | |
b83a313b MB |
608 | |
609 | return ret; | |
610 | } | |
611 | ||
612 | /** | |
613 | * regmap_read(): Read a value from a single register | |
614 | * | |
615 | * @map: Register map to write to | |
616 | * @reg: Register to be read from | |
617 | * @val: Pointer to store read value | |
618 | * | |
619 | * A value of zero will be returned on success, a negative errno will | |
620 | * be returned in error cases. | |
621 | */ | |
622 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
623 | { | |
624 | int ret; | |
625 | ||
626 | mutex_lock(&map->lock); | |
627 | ||
628 | ret = _regmap_read(map, reg, val); | |
629 | ||
630 | mutex_unlock(&map->lock); | |
631 | ||
632 | return ret; | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(regmap_read); | |
635 | ||
636 | /** | |
637 | * regmap_raw_read(): Read raw data from the device | |
638 | * | |
639 | * @map: Register map to write to | |
640 | * @reg: First register to be read from | |
641 | * @val: Pointer to store read value | |
642 | * @val_len: Size of data to read | |
643 | * | |
644 | * A value of zero will be returned on success, a negative errno will | |
645 | * be returned in error cases. | |
646 | */ | |
647 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
648 | size_t val_len) | |
649 | { | |
b8fb5ab1 MB |
650 | size_t val_bytes = map->format.val_bytes; |
651 | size_t val_count = val_len / val_bytes; | |
652 | unsigned int v; | |
653 | int ret, i; | |
04e016ad | 654 | |
b83a313b MB |
655 | mutex_lock(&map->lock); |
656 | ||
b8fb5ab1 MB |
657 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
658 | map->cache_type == REGCACHE_NONE) { | |
659 | /* Physical block read if there's no cache involved */ | |
660 | ret = _regmap_raw_read(map, reg, val, val_len); | |
661 | ||
662 | } else { | |
663 | /* Otherwise go word by word for the cache; should be low | |
664 | * cost as we expect to hit the cache. | |
665 | */ | |
666 | for (i = 0; i < val_count; i++) { | |
667 | ret = _regmap_read(map, reg + i, &v); | |
668 | if (ret != 0) | |
669 | goto out; | |
670 | ||
671 | map->format.format_val(val + (i * val_bytes), v); | |
672 | } | |
673 | } | |
b83a313b | 674 | |
b8fb5ab1 | 675 | out: |
b83a313b MB |
676 | mutex_unlock(&map->lock); |
677 | ||
678 | return ret; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
681 | ||
682 | /** | |
683 | * regmap_bulk_read(): Read multiple registers from the device | |
684 | * | |
685 | * @map: Register map to write to | |
686 | * @reg: First register to be read from | |
687 | * @val: Pointer to store read value, in native register size for device | |
688 | * @val_count: Number of registers to read | |
689 | * | |
690 | * A value of zero will be returned on success, a negative errno will | |
691 | * be returned in error cases. | |
692 | */ | |
693 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
694 | size_t val_count) | |
695 | { | |
696 | int ret, i; | |
697 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 698 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 699 | |
b83a313b MB |
700 | if (!map->format.parse_val) |
701 | return -EINVAL; | |
702 | ||
de2d808f MB |
703 | if (vol || map->cache_type == REGCACHE_NONE) { |
704 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
705 | if (ret != 0) | |
706 | return ret; | |
707 | ||
708 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
709 | map->format.parse_val(val + i); | |
710 | } else { | |
711 | for (i = 0; i < val_count; i++) { | |
712 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
713 | if (ret != 0) | |
714 | return ret; | |
715 | } | |
716 | } | |
b83a313b MB |
717 | |
718 | return 0; | |
719 | } | |
720 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
721 | ||
018690d3 MB |
722 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
723 | unsigned int mask, unsigned int val, | |
724 | bool *change) | |
b83a313b MB |
725 | { |
726 | int ret; | |
d91e8db2 | 727 | unsigned int tmp, orig; |
b83a313b MB |
728 | |
729 | mutex_lock(&map->lock); | |
730 | ||
d91e8db2 | 731 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
732 | if (ret != 0) |
733 | goto out; | |
734 | ||
d91e8db2 | 735 | tmp = orig & ~mask; |
b83a313b MB |
736 | tmp |= val & mask; |
737 | ||
018690d3 | 738 | if (tmp != orig) { |
d91e8db2 | 739 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
740 | *change = true; |
741 | } else { | |
742 | *change = false; | |
743 | } | |
b83a313b MB |
744 | |
745 | out: | |
746 | mutex_unlock(&map->lock); | |
747 | ||
748 | return ret; | |
749 | } | |
018690d3 MB |
750 | |
751 | /** | |
752 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
753 | * | |
754 | * @map: Register map to update | |
755 | * @reg: Register to update | |
756 | * @mask: Bitmask to change | |
757 | * @val: New value for bitmask | |
758 | * | |
759 | * Returns zero for success, a negative number on error. | |
760 | */ | |
761 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
762 | unsigned int mask, unsigned int val) | |
763 | { | |
764 | bool change; | |
765 | return _regmap_update_bits(map, reg, mask, val, &change); | |
766 | } | |
b83a313b | 767 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 768 | |
018690d3 MB |
769 | /** |
770 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
771 | * register map and report if updated | |
772 | * | |
773 | * @map: Register map to update | |
774 | * @reg: Register to update | |
775 | * @mask: Bitmask to change | |
776 | * @val: New value for bitmask | |
777 | * @change: Boolean indicating if a write was done | |
778 | * | |
779 | * Returns zero for success, a negative number on error. | |
780 | */ | |
781 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
782 | unsigned int mask, unsigned int val, | |
783 | bool *change) | |
784 | { | |
785 | return _regmap_update_bits(map, reg, mask, val, change); | |
786 | } | |
787 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
788 | ||
22f0d90a MB |
789 | /** |
790 | * regmap_register_patch: Register and apply register updates to be applied | |
791 | * on device initialistion | |
792 | * | |
793 | * @map: Register map to apply updates to. | |
794 | * @regs: Values to update. | |
795 | * @num_regs: Number of entries in regs. | |
796 | * | |
797 | * Register a set of register updates to be applied to the device | |
798 | * whenever the device registers are synchronised with the cache and | |
799 | * apply them immediately. Typically this is used to apply | |
800 | * corrections to be applied to the device defaults on startup, such | |
801 | * as the updates some vendors provide to undocumented registers. | |
802 | */ | |
803 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
804 | int num_regs) | |
805 | { | |
806 | int i, ret; | |
807 | bool bypass; | |
808 | ||
809 | /* If needed the implementation can be extended to support this */ | |
810 | if (map->patch) | |
811 | return -EBUSY; | |
812 | ||
813 | mutex_lock(&map->lock); | |
814 | ||
815 | bypass = map->cache_bypass; | |
816 | ||
817 | map->cache_bypass = true; | |
818 | ||
819 | /* Write out first; it's useful to apply even if we fail later. */ | |
820 | for (i = 0; i < num_regs; i++) { | |
821 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
822 | if (ret != 0) { | |
823 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
824 | regs[i].reg, regs[i].def, ret); | |
825 | goto out; | |
826 | } | |
827 | } | |
828 | ||
2a14d7d9 | 829 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
830 | if (map->patch != NULL) { |
831 | memcpy(map->patch, regs, | |
832 | num_regs * sizeof(struct reg_default)); | |
833 | map->patch_regs = num_regs; | |
834 | } else { | |
835 | ret = -ENOMEM; | |
836 | } | |
837 | ||
838 | out: | |
839 | map->cache_bypass = bypass; | |
840 | ||
841 | mutex_unlock(&map->lock); | |
842 | ||
843 | return ret; | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
846 | ||
31244e39 MB |
847 | static int __init regmap_initcall(void) |
848 | { | |
849 | regmap_debugfs_initcall(); | |
850 | ||
851 | return 0; | |
852 | } | |
853 | postcore_initcall(regmap_initcall); |