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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 | ||
ea279fc5 MR |
129 | static void regmap_format_24(void *buf, unsigned int val) |
130 | { | |
131 | u8 *b = buf; | |
132 | ||
133 | b[0] = val >> 16; | |
134 | b[1] = val >> 8; | |
135 | b[2] = val; | |
136 | } | |
137 | ||
7d5e525b MB |
138 | static void regmap_format_32(void *buf, unsigned int val) |
139 | { | |
140 | __be32 *b = buf; | |
141 | ||
142 | b[0] = cpu_to_be32(val); | |
143 | } | |
144 | ||
b83a313b MB |
145 | static unsigned int regmap_parse_8(void *buf) |
146 | { | |
147 | u8 *b = buf; | |
148 | ||
149 | return b[0]; | |
150 | } | |
151 | ||
152 | static unsigned int regmap_parse_16(void *buf) | |
153 | { | |
154 | __be16 *b = buf; | |
155 | ||
156 | b[0] = be16_to_cpu(b[0]); | |
157 | ||
158 | return b[0]; | |
159 | } | |
160 | ||
ea279fc5 MR |
161 | static unsigned int regmap_parse_24(void *buf) |
162 | { | |
163 | u8 *b = buf; | |
164 | unsigned int ret = b[2]; | |
165 | ret |= ((unsigned int)b[1]) << 8; | |
166 | ret |= ((unsigned int)b[0]) << 16; | |
167 | ||
168 | return ret; | |
169 | } | |
170 | ||
7d5e525b MB |
171 | static unsigned int regmap_parse_32(void *buf) |
172 | { | |
173 | __be32 *b = buf; | |
174 | ||
175 | b[0] = be32_to_cpu(b[0]); | |
176 | ||
177 | return b[0]; | |
178 | } | |
179 | ||
b83a313b MB |
180 | /** |
181 | * regmap_init(): Initialise register map | |
182 | * | |
183 | * @dev: Device that will be interacted with | |
184 | * @bus: Bus-specific callbacks to use with device | |
185 | * @config: Configuration for register map | |
186 | * | |
187 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
188 | * a struct regmap. This function should generally not be called | |
189 | * directly, it should be called by bus-specific init functions. | |
190 | */ | |
191 | struct regmap *regmap_init(struct device *dev, | |
192 | const struct regmap_bus *bus, | |
193 | const struct regmap_config *config) | |
194 | { | |
195 | struct regmap *map; | |
196 | int ret = -EINVAL; | |
197 | ||
198 | if (!bus || !config) | |
abbb18fb | 199 | goto err; |
b83a313b MB |
200 | |
201 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
202 | if (map == NULL) { | |
203 | ret = -ENOMEM; | |
204 | goto err; | |
205 | } | |
206 | ||
207 | mutex_init(&map->lock); | |
208 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 209 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 210 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 211 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 212 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
213 | map->dev = dev; |
214 | map->bus = bus; | |
2e2ae66d MB |
215 | map->max_register = config->max_register; |
216 | map->writeable_reg = config->writeable_reg; | |
217 | map->readable_reg = config->readable_reg; | |
218 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 219 | map->precious_reg = config->precious_reg; |
5d1729e7 | 220 | map->cache_type = config->cache_type; |
b83a313b | 221 | |
6f306441 LPC |
222 | if (config->read_flag_mask || config->write_flag_mask) { |
223 | map->read_flag_mask = config->read_flag_mask; | |
224 | map->write_flag_mask = config->write_flag_mask; | |
225 | } else { | |
226 | map->read_flag_mask = bus->read_flag_mask; | |
227 | } | |
228 | ||
b83a313b | 229 | switch (config->reg_bits) { |
9aa50750 WS |
230 | case 2: |
231 | switch (config->val_bits) { | |
232 | case 6: | |
233 | map->format.format_write = regmap_format_2_6_write; | |
234 | break; | |
235 | default: | |
236 | goto err_map; | |
237 | } | |
238 | break; | |
239 | ||
b83a313b MB |
240 | case 4: |
241 | switch (config->val_bits) { | |
242 | case 12: | |
243 | map->format.format_write = regmap_format_4_12_write; | |
244 | break; | |
245 | default: | |
246 | goto err_map; | |
247 | } | |
248 | break; | |
249 | ||
250 | case 7: | |
251 | switch (config->val_bits) { | |
252 | case 9: | |
253 | map->format.format_write = regmap_format_7_9_write; | |
254 | break; | |
255 | default: | |
256 | goto err_map; | |
257 | } | |
258 | break; | |
259 | ||
7e5ec63e LPC |
260 | case 10: |
261 | switch (config->val_bits) { | |
262 | case 14: | |
263 | map->format.format_write = regmap_format_10_14_write; | |
264 | break; | |
265 | default: | |
266 | goto err_map; | |
267 | } | |
268 | break; | |
269 | ||
b83a313b MB |
270 | case 8: |
271 | map->format.format_reg = regmap_format_8; | |
272 | break; | |
273 | ||
274 | case 16: | |
275 | map->format.format_reg = regmap_format_16; | |
276 | break; | |
277 | ||
7d5e525b MB |
278 | case 32: |
279 | map->format.format_reg = regmap_format_32; | |
280 | break; | |
281 | ||
b83a313b MB |
282 | default: |
283 | goto err_map; | |
284 | } | |
285 | ||
286 | switch (config->val_bits) { | |
287 | case 8: | |
288 | map->format.format_val = regmap_format_8; | |
289 | map->format.parse_val = regmap_parse_8; | |
290 | break; | |
291 | case 16: | |
292 | map->format.format_val = regmap_format_16; | |
293 | map->format.parse_val = regmap_parse_16; | |
294 | break; | |
ea279fc5 MR |
295 | case 24: |
296 | map->format.format_val = regmap_format_24; | |
297 | map->format.parse_val = regmap_parse_24; | |
298 | break; | |
7d5e525b MB |
299 | case 32: |
300 | map->format.format_val = regmap_format_32; | |
301 | map->format.parse_val = regmap_parse_32; | |
302 | break; | |
b83a313b MB |
303 | } |
304 | ||
305 | if (!map->format.format_write && | |
306 | !(map->format.format_reg && map->format.format_val)) | |
307 | goto err_map; | |
308 | ||
82159ba8 | 309 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
310 | if (map->work_buf == NULL) { |
311 | ret = -ENOMEM; | |
5204f5e3 | 312 | goto err_map; |
b83a313b MB |
313 | } |
314 | ||
052d2cd1 MB |
315 | regmap_debugfs_init(map); |
316 | ||
e5e3b8ab | 317 | ret = regcache_init(map, config); |
5d1729e7 | 318 | if (ret < 0) |
58072cbf | 319 | goto err_free_workbuf; |
5d1729e7 | 320 | |
b83a313b MB |
321 | return map; |
322 | ||
58072cbf LPC |
323 | err_free_workbuf: |
324 | kfree(map->work_buf); | |
b83a313b MB |
325 | err_map: |
326 | kfree(map); | |
327 | err: | |
328 | return ERR_PTR(ret); | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(regmap_init); | |
331 | ||
c0eb4676 MB |
332 | static void devm_regmap_release(struct device *dev, void *res) |
333 | { | |
334 | regmap_exit(*(struct regmap **)res); | |
335 | } | |
336 | ||
337 | /** | |
338 | * devm_regmap_init(): Initialise managed register map | |
339 | * | |
340 | * @dev: Device that will be interacted with | |
341 | * @bus: Bus-specific callbacks to use with device | |
342 | * @config: Configuration for register map | |
343 | * | |
344 | * The return value will be an ERR_PTR() on error or a valid pointer | |
345 | * to a struct regmap. This function should generally not be called | |
346 | * directly, it should be called by bus-specific init functions. The | |
347 | * map will be automatically freed by the device management code. | |
348 | */ | |
349 | struct regmap *devm_regmap_init(struct device *dev, | |
350 | const struct regmap_bus *bus, | |
351 | const struct regmap_config *config) | |
352 | { | |
353 | struct regmap **ptr, *regmap; | |
354 | ||
355 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
356 | if (!ptr) | |
357 | return ERR_PTR(-ENOMEM); | |
358 | ||
359 | regmap = regmap_init(dev, bus, config); | |
360 | if (!IS_ERR(regmap)) { | |
361 | *ptr = regmap; | |
362 | devres_add(dev, ptr); | |
363 | } else { | |
364 | devres_free(ptr); | |
365 | } | |
366 | ||
367 | return regmap; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
370 | ||
bf315173 MB |
371 | /** |
372 | * regmap_reinit_cache(): Reinitialise the current register cache | |
373 | * | |
374 | * @map: Register map to operate on. | |
375 | * @config: New configuration. Only the cache data will be used. | |
376 | * | |
377 | * Discard any existing register cache for the map and initialize a | |
378 | * new cache. This can be used to restore the cache to defaults or to | |
379 | * update the cache configuration to reflect runtime discovery of the | |
380 | * hardware. | |
381 | */ | |
382 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
383 | { | |
384 | int ret; | |
385 | ||
386 | mutex_lock(&map->lock); | |
387 | ||
388 | regcache_exit(map); | |
a24f64a6 | 389 | regmap_debugfs_exit(map); |
bf315173 MB |
390 | |
391 | map->max_register = config->max_register; | |
392 | map->writeable_reg = config->writeable_reg; | |
393 | map->readable_reg = config->readable_reg; | |
394 | map->volatile_reg = config->volatile_reg; | |
395 | map->precious_reg = config->precious_reg; | |
396 | map->cache_type = config->cache_type; | |
397 | ||
a24f64a6 MB |
398 | regmap_debugfs_init(map); |
399 | ||
421e8d2d MB |
400 | map->cache_bypass = false; |
401 | map->cache_only = false; | |
402 | ||
bf315173 MB |
403 | ret = regcache_init(map, config); |
404 | ||
405 | mutex_unlock(&map->lock); | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
b83a313b MB |
410 | /** |
411 | * regmap_exit(): Free a previously allocated register map | |
412 | */ | |
413 | void regmap_exit(struct regmap *map) | |
414 | { | |
5d1729e7 | 415 | regcache_exit(map); |
31244e39 | 416 | regmap_debugfs_exit(map); |
b83a313b | 417 | kfree(map->work_buf); |
b83a313b MB |
418 | kfree(map); |
419 | } | |
420 | EXPORT_SYMBOL_GPL(regmap_exit); | |
421 | ||
422 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
423 | const void *val, size_t val_len) | |
424 | { | |
6f306441 | 425 | u8 *u8 = map->work_buf; |
b83a313b MB |
426 | void *buf; |
427 | int ret = -ENOTSUPP; | |
428 | size_t len; | |
73304781 MB |
429 | int i; |
430 | ||
431 | /* Check for unwritable registers before we start */ | |
432 | if (map->writeable_reg) | |
433 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
434 | if (!map->writeable_reg(map->dev, reg + i)) | |
435 | return -EINVAL; | |
b83a313b | 436 | |
c9157198 LD |
437 | if (!map->cache_bypass && map->format.parse_val) { |
438 | unsigned int ival; | |
439 | int val_bytes = map->format.val_bytes; | |
440 | for (i = 0; i < val_len / val_bytes; i++) { | |
441 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
442 | ival = map->format.parse_val(map->work_buf); | |
443 | ret = regcache_write(map, reg + i, ival); | |
444 | if (ret) { | |
445 | dev_err(map->dev, | |
446 | "Error in caching of register: %u ret: %d\n", | |
447 | reg + i, ret); | |
448 | return ret; | |
449 | } | |
450 | } | |
451 | if (map->cache_only) { | |
452 | map->cache_dirty = true; | |
453 | return 0; | |
454 | } | |
455 | } | |
456 | ||
b83a313b MB |
457 | map->format.format_reg(map->work_buf, reg); |
458 | ||
6f306441 LPC |
459 | u8[0] |= map->write_flag_mask; |
460 | ||
fb2736bb MB |
461 | trace_regmap_hw_write_start(map->dev, reg, |
462 | val_len / map->format.val_bytes); | |
463 | ||
2547e201 MB |
464 | /* If we're doing a single register write we can probably just |
465 | * send the work_buf directly, otherwise try to do a gather | |
466 | * write. | |
467 | */ | |
82159ba8 MB |
468 | if (val == (map->work_buf + map->format.pad_bytes + |
469 | map->format.reg_bytes)) | |
2547e201 | 470 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
471 | map->format.reg_bytes + |
472 | map->format.pad_bytes + | |
473 | val_len); | |
2547e201 | 474 | else if (map->bus->gather_write) |
b83a313b | 475 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
476 | map->format.reg_bytes + |
477 | map->format.pad_bytes, | |
b83a313b MB |
478 | val, val_len); |
479 | ||
2547e201 | 480 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 481 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
482 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
483 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
484 | if (!buf) |
485 | return -ENOMEM; | |
486 | ||
487 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
488 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
489 | val, val_len); | |
b83a313b MB |
490 | ret = map->bus->write(map->dev, buf, len); |
491 | ||
492 | kfree(buf); | |
493 | } | |
494 | ||
fb2736bb MB |
495 | trace_regmap_hw_write_done(map->dev, reg, |
496 | val_len / map->format.val_bytes); | |
497 | ||
b83a313b MB |
498 | return ret; |
499 | } | |
500 | ||
4d2dc095 DP |
501 | int _regmap_write(struct regmap *map, unsigned int reg, |
502 | unsigned int val) | |
b83a313b | 503 | { |
fb2736bb | 504 | int ret; |
b83a313b MB |
505 | BUG_ON(!map->format.format_write && !map->format.format_val); |
506 | ||
c9157198 | 507 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
508 | ret = regcache_write(map, reg, val); |
509 | if (ret != 0) | |
510 | return ret; | |
8ae0d7e8 MB |
511 | if (map->cache_only) { |
512 | map->cache_dirty = true; | |
5d1729e7 | 513 | return 0; |
8ae0d7e8 | 514 | } |
5d1729e7 DP |
515 | } |
516 | ||
fb2736bb MB |
517 | trace_regmap_reg_write(map->dev, reg, val); |
518 | ||
b83a313b MB |
519 | if (map->format.format_write) { |
520 | map->format.format_write(map, reg, val); | |
521 | ||
fb2736bb MB |
522 | trace_regmap_hw_write_start(map->dev, reg, 1); |
523 | ||
524 | ret = map->bus->write(map->dev, map->work_buf, | |
525 | map->format.buf_size); | |
526 | ||
527 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
528 | ||
529 | return ret; | |
b83a313b | 530 | } else { |
82159ba8 MB |
531 | map->format.format_val(map->work_buf + map->format.reg_bytes |
532 | + map->format.pad_bytes, val); | |
b83a313b | 533 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
534 | map->work_buf + |
535 | map->format.reg_bytes + | |
536 | map->format.pad_bytes, | |
b83a313b MB |
537 | map->format.val_bytes); |
538 | } | |
539 | } | |
540 | ||
541 | /** | |
542 | * regmap_write(): Write a value to a single register | |
543 | * | |
544 | * @map: Register map to write to | |
545 | * @reg: Register to write to | |
546 | * @val: Value to be written | |
547 | * | |
548 | * A value of zero will be returned on success, a negative errno will | |
549 | * be returned in error cases. | |
550 | */ | |
551 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
552 | { | |
553 | int ret; | |
554 | ||
555 | mutex_lock(&map->lock); | |
556 | ||
557 | ret = _regmap_write(map, reg, val); | |
558 | ||
559 | mutex_unlock(&map->lock); | |
560 | ||
561 | return ret; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(regmap_write); | |
564 | ||
565 | /** | |
566 | * regmap_raw_write(): Write raw values to one or more registers | |
567 | * | |
568 | * @map: Register map to write to | |
569 | * @reg: Initial register to write to | |
570 | * @val: Block of data to be written, laid out for direct transmission to the | |
571 | * device | |
572 | * @val_len: Length of data pointed to by val. | |
573 | * | |
574 | * This function is intended to be used for things like firmware | |
575 | * download where a large block of data needs to be transferred to the | |
576 | * device. No formatting will be done on the data provided. | |
577 | * | |
578 | * A value of zero will be returned on success, a negative errno will | |
579 | * be returned in error cases. | |
580 | */ | |
581 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
582 | const void *val, size_t val_len) | |
583 | { | |
584 | int ret; | |
585 | ||
586 | mutex_lock(&map->lock); | |
587 | ||
588 | ret = _regmap_raw_write(map, reg, val, val_len); | |
589 | ||
590 | mutex_unlock(&map->lock); | |
591 | ||
592 | return ret; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
595 | ||
8eaeb219 LD |
596 | /* |
597 | * regmap_bulk_write(): Write multiple registers to the device | |
598 | * | |
599 | * @map: Register map to write to | |
600 | * @reg: First register to be write from | |
601 | * @val: Block of data to be written, in native register size for device | |
602 | * @val_count: Number of registers to write | |
603 | * | |
604 | * This function is intended to be used for writing a large block of | |
605 | * data to be device either in single transfer or multiple transfer. | |
606 | * | |
607 | * A value of zero will be returned on success, a negative errno will | |
608 | * be returned in error cases. | |
609 | */ | |
610 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
611 | size_t val_count) | |
612 | { | |
613 | int ret = 0, i; | |
614 | size_t val_bytes = map->format.val_bytes; | |
615 | void *wval; | |
616 | ||
617 | if (!map->format.parse_val) | |
618 | return -EINVAL; | |
619 | ||
620 | mutex_lock(&map->lock); | |
621 | ||
622 | /* No formatting is require if val_byte is 1 */ | |
623 | if (val_bytes == 1) { | |
624 | wval = (void *)val; | |
625 | } else { | |
626 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
627 | if (!wval) { | |
628 | ret = -ENOMEM; | |
629 | dev_err(map->dev, "Error in memory allocation\n"); | |
630 | goto out; | |
631 | } | |
632 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
633 | map->format.parse_val(wval + i); | |
634 | } | |
635 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
636 | ||
637 | if (val_bytes != 1) | |
638 | kfree(wval); | |
639 | ||
640 | out: | |
641 | mutex_unlock(&map->lock); | |
642 | return ret; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
645 | ||
b83a313b MB |
646 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
647 | unsigned int val_len) | |
648 | { | |
649 | u8 *u8 = map->work_buf; | |
650 | int ret; | |
651 | ||
652 | map->format.format_reg(map->work_buf, reg); | |
653 | ||
654 | /* | |
6f306441 | 655 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
656 | * register addresss; since it's always the high bits for all |
657 | * current formats we can do this here rather than in | |
658 | * formatting. This may break if we get interesting formats. | |
659 | */ | |
6f306441 | 660 | u8[0] |= map->read_flag_mask; |
b83a313b | 661 | |
fb2736bb MB |
662 | trace_regmap_hw_read_start(map->dev, reg, |
663 | val_len / map->format.val_bytes); | |
664 | ||
82159ba8 MB |
665 | ret = map->bus->read(map->dev, map->work_buf, |
666 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 667 | val, val_len); |
b83a313b | 668 | |
fb2736bb MB |
669 | trace_regmap_hw_read_done(map->dev, reg, |
670 | val_len / map->format.val_bytes); | |
671 | ||
672 | return ret; | |
b83a313b MB |
673 | } |
674 | ||
675 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
676 | unsigned int *val) | |
677 | { | |
678 | int ret; | |
679 | ||
5d1729e7 DP |
680 | if (!map->cache_bypass) { |
681 | ret = regcache_read(map, reg, val); | |
682 | if (ret == 0) | |
683 | return 0; | |
684 | } | |
685 | ||
19254411 LPC |
686 | if (!map->format.parse_val) |
687 | return -EINVAL; | |
688 | ||
5d1729e7 DP |
689 | if (map->cache_only) |
690 | return -EBUSY; | |
691 | ||
b83a313b | 692 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 693 | if (ret == 0) { |
b83a313b | 694 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
695 | trace_regmap_reg_read(map->dev, reg, *val); |
696 | } | |
b83a313b MB |
697 | |
698 | return ret; | |
699 | } | |
700 | ||
701 | /** | |
702 | * regmap_read(): Read a value from a single register | |
703 | * | |
704 | * @map: Register map to write to | |
705 | * @reg: Register to be read from | |
706 | * @val: Pointer to store read value | |
707 | * | |
708 | * A value of zero will be returned on success, a negative errno will | |
709 | * be returned in error cases. | |
710 | */ | |
711 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
712 | { | |
713 | int ret; | |
714 | ||
715 | mutex_lock(&map->lock); | |
716 | ||
717 | ret = _regmap_read(map, reg, val); | |
718 | ||
719 | mutex_unlock(&map->lock); | |
720 | ||
721 | return ret; | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(regmap_read); | |
724 | ||
725 | /** | |
726 | * regmap_raw_read(): Read raw data from the device | |
727 | * | |
728 | * @map: Register map to write to | |
729 | * @reg: First register to be read from | |
730 | * @val: Pointer to store read value | |
731 | * @val_len: Size of data to read | |
732 | * | |
733 | * A value of zero will be returned on success, a negative errno will | |
734 | * be returned in error cases. | |
735 | */ | |
736 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
737 | size_t val_len) | |
738 | { | |
b8fb5ab1 MB |
739 | size_t val_bytes = map->format.val_bytes; |
740 | size_t val_count = val_len / val_bytes; | |
741 | unsigned int v; | |
742 | int ret, i; | |
04e016ad | 743 | |
b83a313b MB |
744 | mutex_lock(&map->lock); |
745 | ||
b8fb5ab1 MB |
746 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
747 | map->cache_type == REGCACHE_NONE) { | |
748 | /* Physical block read if there's no cache involved */ | |
749 | ret = _regmap_raw_read(map, reg, val, val_len); | |
750 | ||
751 | } else { | |
752 | /* Otherwise go word by word for the cache; should be low | |
753 | * cost as we expect to hit the cache. | |
754 | */ | |
755 | for (i = 0; i < val_count; i++) { | |
756 | ret = _regmap_read(map, reg + i, &v); | |
757 | if (ret != 0) | |
758 | goto out; | |
759 | ||
760 | map->format.format_val(val + (i * val_bytes), v); | |
761 | } | |
762 | } | |
b83a313b | 763 | |
b8fb5ab1 | 764 | out: |
b83a313b MB |
765 | mutex_unlock(&map->lock); |
766 | ||
767 | return ret; | |
768 | } | |
769 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
770 | ||
771 | /** | |
772 | * regmap_bulk_read(): Read multiple registers from the device | |
773 | * | |
774 | * @map: Register map to write to | |
775 | * @reg: First register to be read from | |
776 | * @val: Pointer to store read value, in native register size for device | |
777 | * @val_count: Number of registers to read | |
778 | * | |
779 | * A value of zero will be returned on success, a negative errno will | |
780 | * be returned in error cases. | |
781 | */ | |
782 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
783 | size_t val_count) | |
784 | { | |
785 | int ret, i; | |
786 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 787 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 788 | |
b83a313b MB |
789 | if (!map->format.parse_val) |
790 | return -EINVAL; | |
791 | ||
de2d808f MB |
792 | if (vol || map->cache_type == REGCACHE_NONE) { |
793 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
794 | if (ret != 0) | |
795 | return ret; | |
796 | ||
797 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
798 | map->format.parse_val(val + i); | |
799 | } else { | |
800 | for (i = 0; i < val_count; i++) { | |
801 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
802 | if (ret != 0) | |
803 | return ret; | |
804 | } | |
805 | } | |
b83a313b MB |
806 | |
807 | return 0; | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
810 | ||
018690d3 MB |
811 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
812 | unsigned int mask, unsigned int val, | |
813 | bool *change) | |
b83a313b MB |
814 | { |
815 | int ret; | |
d91e8db2 | 816 | unsigned int tmp, orig; |
b83a313b MB |
817 | |
818 | mutex_lock(&map->lock); | |
819 | ||
d91e8db2 | 820 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
821 | if (ret != 0) |
822 | goto out; | |
823 | ||
d91e8db2 | 824 | tmp = orig & ~mask; |
b83a313b MB |
825 | tmp |= val & mask; |
826 | ||
018690d3 | 827 | if (tmp != orig) { |
d91e8db2 | 828 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
829 | *change = true; |
830 | } else { | |
831 | *change = false; | |
832 | } | |
b83a313b MB |
833 | |
834 | out: | |
835 | mutex_unlock(&map->lock); | |
836 | ||
837 | return ret; | |
838 | } | |
018690d3 MB |
839 | |
840 | /** | |
841 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
842 | * | |
843 | * @map: Register map to update | |
844 | * @reg: Register to update | |
845 | * @mask: Bitmask to change | |
846 | * @val: New value for bitmask | |
847 | * | |
848 | * Returns zero for success, a negative number on error. | |
849 | */ | |
850 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
851 | unsigned int mask, unsigned int val) | |
852 | { | |
853 | bool change; | |
854 | return _regmap_update_bits(map, reg, mask, val, &change); | |
855 | } | |
b83a313b | 856 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 857 | |
018690d3 MB |
858 | /** |
859 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
860 | * register map and report if updated | |
861 | * | |
862 | * @map: Register map to update | |
863 | * @reg: Register to update | |
864 | * @mask: Bitmask to change | |
865 | * @val: New value for bitmask | |
866 | * @change: Boolean indicating if a write was done | |
867 | * | |
868 | * Returns zero for success, a negative number on error. | |
869 | */ | |
870 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
871 | unsigned int mask, unsigned int val, | |
872 | bool *change) | |
873 | { | |
874 | return _regmap_update_bits(map, reg, mask, val, change); | |
875 | } | |
876 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
877 | ||
22f0d90a MB |
878 | /** |
879 | * regmap_register_patch: Register and apply register updates to be applied | |
880 | * on device initialistion | |
881 | * | |
882 | * @map: Register map to apply updates to. | |
883 | * @regs: Values to update. | |
884 | * @num_regs: Number of entries in regs. | |
885 | * | |
886 | * Register a set of register updates to be applied to the device | |
887 | * whenever the device registers are synchronised with the cache and | |
888 | * apply them immediately. Typically this is used to apply | |
889 | * corrections to be applied to the device defaults on startup, such | |
890 | * as the updates some vendors provide to undocumented registers. | |
891 | */ | |
892 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
893 | int num_regs) | |
894 | { | |
895 | int i, ret; | |
896 | bool bypass; | |
897 | ||
898 | /* If needed the implementation can be extended to support this */ | |
899 | if (map->patch) | |
900 | return -EBUSY; | |
901 | ||
902 | mutex_lock(&map->lock); | |
903 | ||
904 | bypass = map->cache_bypass; | |
905 | ||
906 | map->cache_bypass = true; | |
907 | ||
908 | /* Write out first; it's useful to apply even if we fail later. */ | |
909 | for (i = 0; i < num_regs; i++) { | |
910 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
911 | if (ret != 0) { | |
912 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
913 | regs[i].reg, regs[i].def, ret); | |
914 | goto out; | |
915 | } | |
916 | } | |
917 | ||
2a14d7d9 | 918 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
919 | if (map->patch != NULL) { |
920 | memcpy(map->patch, regs, | |
921 | num_regs * sizeof(struct reg_default)); | |
922 | map->patch_regs = num_regs; | |
923 | } else { | |
924 | ret = -ENOMEM; | |
925 | } | |
926 | ||
927 | out: | |
928 | map->cache_bypass = bypass; | |
929 | ||
930 | mutex_unlock(&map->lock); | |
931 | ||
932 | return ret; | |
933 | } | |
934 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
935 | ||
eae4b51b | 936 | /* |
a6539c32 MB |
937 | * regmap_get_val_bytes(): Report the size of a register value |
938 | * | |
939 | * Report the size of a register value, mainly intended to for use by | |
940 | * generic infrastructure built on top of regmap. | |
941 | */ | |
942 | int regmap_get_val_bytes(struct regmap *map) | |
943 | { | |
944 | if (map->format.format_write) | |
945 | return -EINVAL; | |
946 | ||
947 | return map->format.val_bytes; | |
948 | } | |
949 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
950 | ||
31244e39 MB |
951 | static int __init regmap_initcall(void) |
952 | { | |
953 | regmap_debugfs_initcall(); | |
954 | ||
955 | return 0; | |
956 | } | |
957 | postcore_initcall(regmap_initcall); |