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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 | ||
d939fb9a | 115 | static void regmap_format_8(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
116 | { |
117 | u8 *b = buf; | |
118 | ||
d939fb9a | 119 | b[0] = val << shift; |
b83a313b MB |
120 | } |
121 | ||
d939fb9a | 122 | static void regmap_format_16(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
123 | { |
124 | __be16 *b = buf; | |
125 | ||
d939fb9a | 126 | b[0] = cpu_to_be16(val << shift); |
b83a313b MB |
127 | } |
128 | ||
d939fb9a | 129 | static void regmap_format_24(void *buf, unsigned int val, unsigned int shift) |
ea279fc5 MR |
130 | { |
131 | u8 *b = buf; | |
132 | ||
d939fb9a MR |
133 | val <<= shift; |
134 | ||
ea279fc5 MR |
135 | b[0] = val >> 16; |
136 | b[1] = val >> 8; | |
137 | b[2] = val; | |
138 | } | |
139 | ||
d939fb9a | 140 | static void regmap_format_32(void *buf, unsigned int val, unsigned int shift) |
7d5e525b MB |
141 | { |
142 | __be32 *b = buf; | |
143 | ||
d939fb9a | 144 | b[0] = cpu_to_be32(val << shift); |
7d5e525b MB |
145 | } |
146 | ||
b83a313b MB |
147 | static unsigned int regmap_parse_8(void *buf) |
148 | { | |
149 | u8 *b = buf; | |
150 | ||
151 | return b[0]; | |
152 | } | |
153 | ||
154 | static unsigned int regmap_parse_16(void *buf) | |
155 | { | |
156 | __be16 *b = buf; | |
157 | ||
158 | b[0] = be16_to_cpu(b[0]); | |
159 | ||
160 | return b[0]; | |
161 | } | |
162 | ||
ea279fc5 MR |
163 | static unsigned int regmap_parse_24(void *buf) |
164 | { | |
165 | u8 *b = buf; | |
166 | unsigned int ret = b[2]; | |
167 | ret |= ((unsigned int)b[1]) << 8; | |
168 | ret |= ((unsigned int)b[0]) << 16; | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
7d5e525b MB |
173 | static unsigned int regmap_parse_32(void *buf) |
174 | { | |
175 | __be32 *b = buf; | |
176 | ||
177 | b[0] = be32_to_cpu(b[0]); | |
178 | ||
179 | return b[0]; | |
180 | } | |
181 | ||
b83a313b MB |
182 | /** |
183 | * regmap_init(): Initialise register map | |
184 | * | |
185 | * @dev: Device that will be interacted with | |
186 | * @bus: Bus-specific callbacks to use with device | |
187 | * @config: Configuration for register map | |
188 | * | |
189 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
190 | * a struct regmap. This function should generally not be called | |
191 | * directly, it should be called by bus-specific init functions. | |
192 | */ | |
193 | struct regmap *regmap_init(struct device *dev, | |
194 | const struct regmap_bus *bus, | |
195 | const struct regmap_config *config) | |
196 | { | |
197 | struct regmap *map; | |
198 | int ret = -EINVAL; | |
199 | ||
200 | if (!bus || !config) | |
abbb18fb | 201 | goto err; |
b83a313b MB |
202 | |
203 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
204 | if (map == NULL) { | |
205 | ret = -ENOMEM; | |
206 | goto err; | |
207 | } | |
208 | ||
209 | mutex_init(&map->lock); | |
210 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 211 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 212 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 213 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 214 | map->format.buf_size += map->format.pad_bytes; |
d939fb9a | 215 | map->reg_shift = config->pad_bits % 8; |
b83a313b MB |
216 | map->dev = dev; |
217 | map->bus = bus; | |
2e2ae66d MB |
218 | map->max_register = config->max_register; |
219 | map->writeable_reg = config->writeable_reg; | |
220 | map->readable_reg = config->readable_reg; | |
221 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 222 | map->precious_reg = config->precious_reg; |
5d1729e7 | 223 | map->cache_type = config->cache_type; |
b83a313b | 224 | |
6f306441 LPC |
225 | if (config->read_flag_mask || config->write_flag_mask) { |
226 | map->read_flag_mask = config->read_flag_mask; | |
227 | map->write_flag_mask = config->write_flag_mask; | |
228 | } else { | |
229 | map->read_flag_mask = bus->read_flag_mask; | |
230 | } | |
231 | ||
d939fb9a | 232 | switch (config->reg_bits + map->reg_shift) { |
9aa50750 WS |
233 | case 2: |
234 | switch (config->val_bits) { | |
235 | case 6: | |
236 | map->format.format_write = regmap_format_2_6_write; | |
237 | break; | |
238 | default: | |
239 | goto err_map; | |
240 | } | |
241 | break; | |
242 | ||
b83a313b MB |
243 | case 4: |
244 | switch (config->val_bits) { | |
245 | case 12: | |
246 | map->format.format_write = regmap_format_4_12_write; | |
247 | break; | |
248 | default: | |
249 | goto err_map; | |
250 | } | |
251 | break; | |
252 | ||
253 | case 7: | |
254 | switch (config->val_bits) { | |
255 | case 9: | |
256 | map->format.format_write = regmap_format_7_9_write; | |
257 | break; | |
258 | default: | |
259 | goto err_map; | |
260 | } | |
261 | break; | |
262 | ||
7e5ec63e LPC |
263 | case 10: |
264 | switch (config->val_bits) { | |
265 | case 14: | |
266 | map->format.format_write = regmap_format_10_14_write; | |
267 | break; | |
268 | default: | |
269 | goto err_map; | |
270 | } | |
271 | break; | |
272 | ||
b83a313b MB |
273 | case 8: |
274 | map->format.format_reg = regmap_format_8; | |
275 | break; | |
276 | ||
277 | case 16: | |
278 | map->format.format_reg = regmap_format_16; | |
279 | break; | |
280 | ||
7d5e525b MB |
281 | case 32: |
282 | map->format.format_reg = regmap_format_32; | |
283 | break; | |
284 | ||
b83a313b MB |
285 | default: |
286 | goto err_map; | |
287 | } | |
288 | ||
289 | switch (config->val_bits) { | |
290 | case 8: | |
291 | map->format.format_val = regmap_format_8; | |
292 | map->format.parse_val = regmap_parse_8; | |
293 | break; | |
294 | case 16: | |
295 | map->format.format_val = regmap_format_16; | |
296 | map->format.parse_val = regmap_parse_16; | |
297 | break; | |
ea279fc5 MR |
298 | case 24: |
299 | map->format.format_val = regmap_format_24; | |
300 | map->format.parse_val = regmap_parse_24; | |
301 | break; | |
7d5e525b MB |
302 | case 32: |
303 | map->format.format_val = regmap_format_32; | |
304 | map->format.parse_val = regmap_parse_32; | |
305 | break; | |
b83a313b MB |
306 | } |
307 | ||
308 | if (!map->format.format_write && | |
309 | !(map->format.format_reg && map->format.format_val)) | |
310 | goto err_map; | |
311 | ||
82159ba8 | 312 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
313 | if (map->work_buf == NULL) { |
314 | ret = -ENOMEM; | |
5204f5e3 | 315 | goto err_map; |
b83a313b MB |
316 | } |
317 | ||
052d2cd1 MB |
318 | regmap_debugfs_init(map); |
319 | ||
e5e3b8ab | 320 | ret = regcache_init(map, config); |
5d1729e7 | 321 | if (ret < 0) |
58072cbf | 322 | goto err_free_workbuf; |
5d1729e7 | 323 | |
b83a313b MB |
324 | return map; |
325 | ||
58072cbf LPC |
326 | err_free_workbuf: |
327 | kfree(map->work_buf); | |
b83a313b MB |
328 | err_map: |
329 | kfree(map); | |
330 | err: | |
331 | return ERR_PTR(ret); | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(regmap_init); | |
334 | ||
c0eb4676 MB |
335 | static void devm_regmap_release(struct device *dev, void *res) |
336 | { | |
337 | regmap_exit(*(struct regmap **)res); | |
338 | } | |
339 | ||
340 | /** | |
341 | * devm_regmap_init(): Initialise managed register map | |
342 | * | |
343 | * @dev: Device that will be interacted with | |
344 | * @bus: Bus-specific callbacks to use with device | |
345 | * @config: Configuration for register map | |
346 | * | |
347 | * The return value will be an ERR_PTR() on error or a valid pointer | |
348 | * to a struct regmap. This function should generally not be called | |
349 | * directly, it should be called by bus-specific init functions. The | |
350 | * map will be automatically freed by the device management code. | |
351 | */ | |
352 | struct regmap *devm_regmap_init(struct device *dev, | |
353 | const struct regmap_bus *bus, | |
354 | const struct regmap_config *config) | |
355 | { | |
356 | struct regmap **ptr, *regmap; | |
357 | ||
358 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
359 | if (!ptr) | |
360 | return ERR_PTR(-ENOMEM); | |
361 | ||
362 | regmap = regmap_init(dev, bus, config); | |
363 | if (!IS_ERR(regmap)) { | |
364 | *ptr = regmap; | |
365 | devres_add(dev, ptr); | |
366 | } else { | |
367 | devres_free(ptr); | |
368 | } | |
369 | ||
370 | return regmap; | |
371 | } | |
372 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
373 | ||
bf315173 MB |
374 | /** |
375 | * regmap_reinit_cache(): Reinitialise the current register cache | |
376 | * | |
377 | * @map: Register map to operate on. | |
378 | * @config: New configuration. Only the cache data will be used. | |
379 | * | |
380 | * Discard any existing register cache for the map and initialize a | |
381 | * new cache. This can be used to restore the cache to defaults or to | |
382 | * update the cache configuration to reflect runtime discovery of the | |
383 | * hardware. | |
384 | */ | |
385 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
386 | { | |
387 | int ret; | |
388 | ||
389 | mutex_lock(&map->lock); | |
390 | ||
391 | regcache_exit(map); | |
a24f64a6 | 392 | regmap_debugfs_exit(map); |
bf315173 MB |
393 | |
394 | map->max_register = config->max_register; | |
395 | map->writeable_reg = config->writeable_reg; | |
396 | map->readable_reg = config->readable_reg; | |
397 | map->volatile_reg = config->volatile_reg; | |
398 | map->precious_reg = config->precious_reg; | |
399 | map->cache_type = config->cache_type; | |
400 | ||
a24f64a6 MB |
401 | regmap_debugfs_init(map); |
402 | ||
421e8d2d MB |
403 | map->cache_bypass = false; |
404 | map->cache_only = false; | |
405 | ||
bf315173 MB |
406 | ret = regcache_init(map, config); |
407 | ||
408 | mutex_unlock(&map->lock); | |
409 | ||
410 | return ret; | |
411 | } | |
412 | ||
b83a313b MB |
413 | /** |
414 | * regmap_exit(): Free a previously allocated register map | |
415 | */ | |
416 | void regmap_exit(struct regmap *map) | |
417 | { | |
5d1729e7 | 418 | regcache_exit(map); |
31244e39 | 419 | regmap_debugfs_exit(map); |
b83a313b | 420 | kfree(map->work_buf); |
b83a313b MB |
421 | kfree(map); |
422 | } | |
423 | EXPORT_SYMBOL_GPL(regmap_exit); | |
424 | ||
425 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
426 | const void *val, size_t val_len) | |
427 | { | |
6f306441 | 428 | u8 *u8 = map->work_buf; |
b83a313b MB |
429 | void *buf; |
430 | int ret = -ENOTSUPP; | |
431 | size_t len; | |
73304781 MB |
432 | int i; |
433 | ||
434 | /* Check for unwritable registers before we start */ | |
435 | if (map->writeable_reg) | |
436 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
437 | if (!map->writeable_reg(map->dev, reg + i)) | |
438 | return -EINVAL; | |
b83a313b | 439 | |
c9157198 LD |
440 | if (!map->cache_bypass && map->format.parse_val) { |
441 | unsigned int ival; | |
442 | int val_bytes = map->format.val_bytes; | |
443 | for (i = 0; i < val_len / val_bytes; i++) { | |
444 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
445 | ival = map->format.parse_val(map->work_buf); | |
446 | ret = regcache_write(map, reg + i, ival); | |
447 | if (ret) { | |
448 | dev_err(map->dev, | |
449 | "Error in caching of register: %u ret: %d\n", | |
450 | reg + i, ret); | |
451 | return ret; | |
452 | } | |
453 | } | |
454 | if (map->cache_only) { | |
455 | map->cache_dirty = true; | |
456 | return 0; | |
457 | } | |
458 | } | |
459 | ||
d939fb9a | 460 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b | 461 | |
6f306441 LPC |
462 | u8[0] |= map->write_flag_mask; |
463 | ||
fb2736bb MB |
464 | trace_regmap_hw_write_start(map->dev, reg, |
465 | val_len / map->format.val_bytes); | |
466 | ||
2547e201 MB |
467 | /* If we're doing a single register write we can probably just |
468 | * send the work_buf directly, otherwise try to do a gather | |
469 | * write. | |
470 | */ | |
82159ba8 MB |
471 | if (val == (map->work_buf + map->format.pad_bytes + |
472 | map->format.reg_bytes)) | |
2547e201 | 473 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
474 | map->format.reg_bytes + |
475 | map->format.pad_bytes + | |
476 | val_len); | |
2547e201 | 477 | else if (map->bus->gather_write) |
b83a313b | 478 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
479 | map->format.reg_bytes + |
480 | map->format.pad_bytes, | |
b83a313b MB |
481 | val, val_len); |
482 | ||
2547e201 | 483 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 484 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
485 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
486 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
487 | if (!buf) |
488 | return -ENOMEM; | |
489 | ||
490 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
491 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
492 | val, val_len); | |
b83a313b MB |
493 | ret = map->bus->write(map->dev, buf, len); |
494 | ||
495 | kfree(buf); | |
496 | } | |
497 | ||
fb2736bb MB |
498 | trace_regmap_hw_write_done(map->dev, reg, |
499 | val_len / map->format.val_bytes); | |
500 | ||
b83a313b MB |
501 | return ret; |
502 | } | |
503 | ||
4d2dc095 DP |
504 | int _regmap_write(struct regmap *map, unsigned int reg, |
505 | unsigned int val) | |
b83a313b | 506 | { |
fb2736bb | 507 | int ret; |
b83a313b MB |
508 | BUG_ON(!map->format.format_write && !map->format.format_val); |
509 | ||
c9157198 | 510 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
511 | ret = regcache_write(map, reg, val); |
512 | if (ret != 0) | |
513 | return ret; | |
8ae0d7e8 MB |
514 | if (map->cache_only) { |
515 | map->cache_dirty = true; | |
5d1729e7 | 516 | return 0; |
8ae0d7e8 | 517 | } |
5d1729e7 DP |
518 | } |
519 | ||
fb2736bb MB |
520 | trace_regmap_reg_write(map->dev, reg, val); |
521 | ||
b83a313b MB |
522 | if (map->format.format_write) { |
523 | map->format.format_write(map, reg, val); | |
524 | ||
fb2736bb MB |
525 | trace_regmap_hw_write_start(map->dev, reg, 1); |
526 | ||
527 | ret = map->bus->write(map->dev, map->work_buf, | |
528 | map->format.buf_size); | |
529 | ||
530 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
531 | ||
532 | return ret; | |
b83a313b | 533 | } else { |
82159ba8 | 534 | map->format.format_val(map->work_buf + map->format.reg_bytes |
d939fb9a | 535 | + map->format.pad_bytes, val, 0); |
b83a313b | 536 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
537 | map->work_buf + |
538 | map->format.reg_bytes + | |
539 | map->format.pad_bytes, | |
b83a313b MB |
540 | map->format.val_bytes); |
541 | } | |
542 | } | |
543 | ||
544 | /** | |
545 | * regmap_write(): Write a value to a single register | |
546 | * | |
547 | * @map: Register map to write to | |
548 | * @reg: Register to write to | |
549 | * @val: Value to be written | |
550 | * | |
551 | * A value of zero will be returned on success, a negative errno will | |
552 | * be returned in error cases. | |
553 | */ | |
554 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
555 | { | |
556 | int ret; | |
557 | ||
558 | mutex_lock(&map->lock); | |
559 | ||
560 | ret = _regmap_write(map, reg, val); | |
561 | ||
562 | mutex_unlock(&map->lock); | |
563 | ||
564 | return ret; | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(regmap_write); | |
567 | ||
568 | /** | |
569 | * regmap_raw_write(): Write raw values to one or more registers | |
570 | * | |
571 | * @map: Register map to write to | |
572 | * @reg: Initial register to write to | |
573 | * @val: Block of data to be written, laid out for direct transmission to the | |
574 | * device | |
575 | * @val_len: Length of data pointed to by val. | |
576 | * | |
577 | * This function is intended to be used for things like firmware | |
578 | * download where a large block of data needs to be transferred to the | |
579 | * device. No formatting will be done on the data provided. | |
580 | * | |
581 | * A value of zero will be returned on success, a negative errno will | |
582 | * be returned in error cases. | |
583 | */ | |
584 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
585 | const void *val, size_t val_len) | |
586 | { | |
587 | int ret; | |
588 | ||
589 | mutex_lock(&map->lock); | |
590 | ||
591 | ret = _regmap_raw_write(map, reg, val, val_len); | |
592 | ||
593 | mutex_unlock(&map->lock); | |
594 | ||
595 | return ret; | |
596 | } | |
597 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
598 | ||
8eaeb219 LD |
599 | /* |
600 | * regmap_bulk_write(): Write multiple registers to the device | |
601 | * | |
602 | * @map: Register map to write to | |
603 | * @reg: First register to be write from | |
604 | * @val: Block of data to be written, in native register size for device | |
605 | * @val_count: Number of registers to write | |
606 | * | |
607 | * This function is intended to be used for writing a large block of | |
608 | * data to be device either in single transfer or multiple transfer. | |
609 | * | |
610 | * A value of zero will be returned on success, a negative errno will | |
611 | * be returned in error cases. | |
612 | */ | |
613 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
614 | size_t val_count) | |
615 | { | |
616 | int ret = 0, i; | |
617 | size_t val_bytes = map->format.val_bytes; | |
618 | void *wval; | |
619 | ||
620 | if (!map->format.parse_val) | |
621 | return -EINVAL; | |
622 | ||
623 | mutex_lock(&map->lock); | |
624 | ||
625 | /* No formatting is require if val_byte is 1 */ | |
626 | if (val_bytes == 1) { | |
627 | wval = (void *)val; | |
628 | } else { | |
629 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
630 | if (!wval) { | |
631 | ret = -ENOMEM; | |
632 | dev_err(map->dev, "Error in memory allocation\n"); | |
633 | goto out; | |
634 | } | |
635 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
636 | map->format.parse_val(wval + i); | |
637 | } | |
638 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
639 | ||
640 | if (val_bytes != 1) | |
641 | kfree(wval); | |
642 | ||
643 | out: | |
644 | mutex_unlock(&map->lock); | |
645 | return ret; | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
648 | ||
b83a313b MB |
649 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
650 | unsigned int val_len) | |
651 | { | |
652 | u8 *u8 = map->work_buf; | |
653 | int ret; | |
654 | ||
d939fb9a | 655 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b MB |
656 | |
657 | /* | |
6f306441 | 658 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
659 | * register addresss; since it's always the high bits for all |
660 | * current formats we can do this here rather than in | |
661 | * formatting. This may break if we get interesting formats. | |
662 | */ | |
6f306441 | 663 | u8[0] |= map->read_flag_mask; |
b83a313b | 664 | |
fb2736bb MB |
665 | trace_regmap_hw_read_start(map->dev, reg, |
666 | val_len / map->format.val_bytes); | |
667 | ||
82159ba8 MB |
668 | ret = map->bus->read(map->dev, map->work_buf, |
669 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 670 | val, val_len); |
b83a313b | 671 | |
fb2736bb MB |
672 | trace_regmap_hw_read_done(map->dev, reg, |
673 | val_len / map->format.val_bytes); | |
674 | ||
675 | return ret; | |
b83a313b MB |
676 | } |
677 | ||
678 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
679 | unsigned int *val) | |
680 | { | |
681 | int ret; | |
682 | ||
5d1729e7 DP |
683 | if (!map->cache_bypass) { |
684 | ret = regcache_read(map, reg, val); | |
685 | if (ret == 0) | |
686 | return 0; | |
687 | } | |
688 | ||
19254411 LPC |
689 | if (!map->format.parse_val) |
690 | return -EINVAL; | |
691 | ||
5d1729e7 DP |
692 | if (map->cache_only) |
693 | return -EBUSY; | |
694 | ||
b83a313b | 695 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 696 | if (ret == 0) { |
b83a313b | 697 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
698 | trace_regmap_reg_read(map->dev, reg, *val); |
699 | } | |
b83a313b MB |
700 | |
701 | return ret; | |
702 | } | |
703 | ||
704 | /** | |
705 | * regmap_read(): Read a value from a single register | |
706 | * | |
707 | * @map: Register map to write to | |
708 | * @reg: Register to be read from | |
709 | * @val: Pointer to store read value | |
710 | * | |
711 | * A value of zero will be returned on success, a negative errno will | |
712 | * be returned in error cases. | |
713 | */ | |
714 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
715 | { | |
716 | int ret; | |
717 | ||
718 | mutex_lock(&map->lock); | |
719 | ||
720 | ret = _regmap_read(map, reg, val); | |
721 | ||
722 | mutex_unlock(&map->lock); | |
723 | ||
724 | return ret; | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(regmap_read); | |
727 | ||
728 | /** | |
729 | * regmap_raw_read(): Read raw data from the device | |
730 | * | |
731 | * @map: Register map to write to | |
732 | * @reg: First register to be read from | |
733 | * @val: Pointer to store read value | |
734 | * @val_len: Size of data to read | |
735 | * | |
736 | * A value of zero will be returned on success, a negative errno will | |
737 | * be returned in error cases. | |
738 | */ | |
739 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
740 | size_t val_len) | |
741 | { | |
b8fb5ab1 MB |
742 | size_t val_bytes = map->format.val_bytes; |
743 | size_t val_count = val_len / val_bytes; | |
744 | unsigned int v; | |
745 | int ret, i; | |
04e016ad | 746 | |
b83a313b MB |
747 | mutex_lock(&map->lock); |
748 | ||
b8fb5ab1 MB |
749 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
750 | map->cache_type == REGCACHE_NONE) { | |
751 | /* Physical block read if there's no cache involved */ | |
752 | ret = _regmap_raw_read(map, reg, val, val_len); | |
753 | ||
754 | } else { | |
755 | /* Otherwise go word by word for the cache; should be low | |
756 | * cost as we expect to hit the cache. | |
757 | */ | |
758 | for (i = 0; i < val_count; i++) { | |
759 | ret = _regmap_read(map, reg + i, &v); | |
760 | if (ret != 0) | |
761 | goto out; | |
762 | ||
d939fb9a | 763 | map->format.format_val(val + (i * val_bytes), v, 0); |
b8fb5ab1 MB |
764 | } |
765 | } | |
b83a313b | 766 | |
b8fb5ab1 | 767 | out: |
b83a313b MB |
768 | mutex_unlock(&map->lock); |
769 | ||
770 | return ret; | |
771 | } | |
772 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
773 | ||
774 | /** | |
775 | * regmap_bulk_read(): Read multiple registers from the device | |
776 | * | |
777 | * @map: Register map to write to | |
778 | * @reg: First register to be read from | |
779 | * @val: Pointer to store read value, in native register size for device | |
780 | * @val_count: Number of registers to read | |
781 | * | |
782 | * A value of zero will be returned on success, a negative errno will | |
783 | * be returned in error cases. | |
784 | */ | |
785 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
786 | size_t val_count) | |
787 | { | |
788 | int ret, i; | |
789 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 790 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 791 | |
b83a313b MB |
792 | if (!map->format.parse_val) |
793 | return -EINVAL; | |
794 | ||
de2d808f MB |
795 | if (vol || map->cache_type == REGCACHE_NONE) { |
796 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
797 | if (ret != 0) | |
798 | return ret; | |
799 | ||
800 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
801 | map->format.parse_val(val + i); | |
802 | } else { | |
803 | for (i = 0; i < val_count; i++) { | |
804 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
805 | if (ret != 0) | |
806 | return ret; | |
807 | } | |
808 | } | |
b83a313b MB |
809 | |
810 | return 0; | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
813 | ||
018690d3 MB |
814 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
815 | unsigned int mask, unsigned int val, | |
816 | bool *change) | |
b83a313b MB |
817 | { |
818 | int ret; | |
d91e8db2 | 819 | unsigned int tmp, orig; |
b83a313b MB |
820 | |
821 | mutex_lock(&map->lock); | |
822 | ||
d91e8db2 | 823 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
824 | if (ret != 0) |
825 | goto out; | |
826 | ||
d91e8db2 | 827 | tmp = orig & ~mask; |
b83a313b MB |
828 | tmp |= val & mask; |
829 | ||
018690d3 | 830 | if (tmp != orig) { |
d91e8db2 | 831 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
832 | *change = true; |
833 | } else { | |
834 | *change = false; | |
835 | } | |
b83a313b MB |
836 | |
837 | out: | |
838 | mutex_unlock(&map->lock); | |
839 | ||
840 | return ret; | |
841 | } | |
018690d3 MB |
842 | |
843 | /** | |
844 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
845 | * | |
846 | * @map: Register map to update | |
847 | * @reg: Register to update | |
848 | * @mask: Bitmask to change | |
849 | * @val: New value for bitmask | |
850 | * | |
851 | * Returns zero for success, a negative number on error. | |
852 | */ | |
853 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
854 | unsigned int mask, unsigned int val) | |
855 | { | |
856 | bool change; | |
857 | return _regmap_update_bits(map, reg, mask, val, &change); | |
858 | } | |
b83a313b | 859 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 860 | |
018690d3 MB |
861 | /** |
862 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
863 | * register map and report if updated | |
864 | * | |
865 | * @map: Register map to update | |
866 | * @reg: Register to update | |
867 | * @mask: Bitmask to change | |
868 | * @val: New value for bitmask | |
869 | * @change: Boolean indicating if a write was done | |
870 | * | |
871 | * Returns zero for success, a negative number on error. | |
872 | */ | |
873 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
874 | unsigned int mask, unsigned int val, | |
875 | bool *change) | |
876 | { | |
877 | return _regmap_update_bits(map, reg, mask, val, change); | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
880 | ||
22f0d90a MB |
881 | /** |
882 | * regmap_register_patch: Register and apply register updates to be applied | |
883 | * on device initialistion | |
884 | * | |
885 | * @map: Register map to apply updates to. | |
886 | * @regs: Values to update. | |
887 | * @num_regs: Number of entries in regs. | |
888 | * | |
889 | * Register a set of register updates to be applied to the device | |
890 | * whenever the device registers are synchronised with the cache and | |
891 | * apply them immediately. Typically this is used to apply | |
892 | * corrections to be applied to the device defaults on startup, such | |
893 | * as the updates some vendors provide to undocumented registers. | |
894 | */ | |
895 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
896 | int num_regs) | |
897 | { | |
898 | int i, ret; | |
899 | bool bypass; | |
900 | ||
901 | /* If needed the implementation can be extended to support this */ | |
902 | if (map->patch) | |
903 | return -EBUSY; | |
904 | ||
905 | mutex_lock(&map->lock); | |
906 | ||
907 | bypass = map->cache_bypass; | |
908 | ||
909 | map->cache_bypass = true; | |
910 | ||
911 | /* Write out first; it's useful to apply even if we fail later. */ | |
912 | for (i = 0; i < num_regs; i++) { | |
913 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
914 | if (ret != 0) { | |
915 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
916 | regs[i].reg, regs[i].def, ret); | |
917 | goto out; | |
918 | } | |
919 | } | |
920 | ||
2a14d7d9 | 921 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
922 | if (map->patch != NULL) { |
923 | memcpy(map->patch, regs, | |
924 | num_regs * sizeof(struct reg_default)); | |
925 | map->patch_regs = num_regs; | |
926 | } else { | |
927 | ret = -ENOMEM; | |
928 | } | |
929 | ||
930 | out: | |
931 | map->cache_bypass = bypass; | |
932 | ||
933 | mutex_unlock(&map->lock); | |
934 | ||
935 | return ret; | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
938 | ||
eae4b51b | 939 | /* |
a6539c32 MB |
940 | * regmap_get_val_bytes(): Report the size of a register value |
941 | * | |
942 | * Report the size of a register value, mainly intended to for use by | |
943 | * generic infrastructure built on top of regmap. | |
944 | */ | |
945 | int regmap_get_val_bytes(struct regmap *map) | |
946 | { | |
947 | if (map->format.format_write) | |
948 | return -EINVAL; | |
949 | ||
950 | return map->format.val_bytes; | |
951 | } | |
952 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
953 | ||
31244e39 MB |
954 | static int __init regmap_initcall(void) |
955 | { | |
956 | regmap_debugfs_initcall(); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | postcore_initcall(regmap_initcall); |