Commit | Line | Data |
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b83a313b MB |
1 | /* |
2 | * Register map access API | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
f5d6eba7 | 13 | #include <linux/device.h> |
b83a313b | 14 | #include <linux/slab.h> |
19694b5e | 15 | #include <linux/export.h> |
b83a313b MB |
16 | #include <linux/mutex.h> |
17 | #include <linux/err.h> | |
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 | |
0135bbcc | 166 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
167 | * @config: Configuration for register map |
168 | * | |
169 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
170 | * a struct regmap. This function should generally not be called | |
171 | * directly, it should be called by bus-specific init functions. | |
172 | */ | |
173 | struct regmap *regmap_init(struct device *dev, | |
174 | const struct regmap_bus *bus, | |
0135bbcc | 175 | void *bus_context, |
b83a313b MB |
176 | const struct regmap_config *config) |
177 | { | |
178 | struct regmap *map; | |
179 | int ret = -EINVAL; | |
180 | ||
181 | if (!bus || !config) | |
abbb18fb | 182 | goto err; |
b83a313b MB |
183 | |
184 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
185 | if (map == NULL) { | |
186 | ret = -ENOMEM; | |
187 | goto err; | |
188 | } | |
189 | ||
190 | mutex_init(&map->lock); | |
191 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 192 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 193 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 194 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 195 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
196 | map->dev = dev; |
197 | map->bus = bus; | |
0135bbcc | 198 | map->bus_context = bus_context; |
2e2ae66d MB |
199 | map->max_register = config->max_register; |
200 | map->writeable_reg = config->writeable_reg; | |
201 | map->readable_reg = config->readable_reg; | |
202 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 203 | map->precious_reg = config->precious_reg; |
5d1729e7 | 204 | map->cache_type = config->cache_type; |
b83a313b | 205 | |
6f306441 LPC |
206 | if (config->read_flag_mask || config->write_flag_mask) { |
207 | map->read_flag_mask = config->read_flag_mask; | |
208 | map->write_flag_mask = config->write_flag_mask; | |
209 | } else { | |
210 | map->read_flag_mask = bus->read_flag_mask; | |
211 | } | |
212 | ||
b83a313b | 213 | switch (config->reg_bits) { |
9aa50750 WS |
214 | case 2: |
215 | switch (config->val_bits) { | |
216 | case 6: | |
217 | map->format.format_write = regmap_format_2_6_write; | |
218 | break; | |
219 | default: | |
220 | goto err_map; | |
221 | } | |
222 | break; | |
223 | ||
b83a313b MB |
224 | case 4: |
225 | switch (config->val_bits) { | |
226 | case 12: | |
227 | map->format.format_write = regmap_format_4_12_write; | |
228 | break; | |
229 | default: | |
230 | goto err_map; | |
231 | } | |
232 | break; | |
233 | ||
234 | case 7: | |
235 | switch (config->val_bits) { | |
236 | case 9: | |
237 | map->format.format_write = regmap_format_7_9_write; | |
238 | break; | |
239 | default: | |
240 | goto err_map; | |
241 | } | |
242 | break; | |
243 | ||
7e5ec63e LPC |
244 | case 10: |
245 | switch (config->val_bits) { | |
246 | case 14: | |
247 | map->format.format_write = regmap_format_10_14_write; | |
248 | break; | |
249 | default: | |
250 | goto err_map; | |
251 | } | |
252 | break; | |
253 | ||
b83a313b MB |
254 | case 8: |
255 | map->format.format_reg = regmap_format_8; | |
256 | break; | |
257 | ||
258 | case 16: | |
259 | map->format.format_reg = regmap_format_16; | |
260 | break; | |
261 | ||
7d5e525b MB |
262 | case 32: |
263 | map->format.format_reg = regmap_format_32; | |
264 | break; | |
265 | ||
b83a313b MB |
266 | default: |
267 | goto err_map; | |
268 | } | |
269 | ||
270 | switch (config->val_bits) { | |
271 | case 8: | |
272 | map->format.format_val = regmap_format_8; | |
273 | map->format.parse_val = regmap_parse_8; | |
274 | break; | |
275 | case 16: | |
276 | map->format.format_val = regmap_format_16; | |
277 | map->format.parse_val = regmap_parse_16; | |
278 | break; | |
7d5e525b MB |
279 | case 32: |
280 | map->format.format_val = regmap_format_32; | |
281 | map->format.parse_val = regmap_parse_32; | |
282 | break; | |
b83a313b MB |
283 | } |
284 | ||
285 | if (!map->format.format_write && | |
286 | !(map->format.format_reg && map->format.format_val)) | |
287 | goto err_map; | |
288 | ||
82159ba8 | 289 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
290 | if (map->work_buf == NULL) { |
291 | ret = -ENOMEM; | |
5204f5e3 | 292 | goto err_map; |
b83a313b MB |
293 | } |
294 | ||
052d2cd1 MB |
295 | regmap_debugfs_init(map); |
296 | ||
e5e3b8ab | 297 | ret = regcache_init(map, config); |
5d1729e7 | 298 | if (ret < 0) |
58072cbf | 299 | goto err_free_workbuf; |
5d1729e7 | 300 | |
b83a313b MB |
301 | return map; |
302 | ||
58072cbf LPC |
303 | err_free_workbuf: |
304 | kfree(map->work_buf); | |
b83a313b MB |
305 | err_map: |
306 | kfree(map); | |
307 | err: | |
308 | return ERR_PTR(ret); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(regmap_init); | |
311 | ||
c0eb4676 MB |
312 | static void devm_regmap_release(struct device *dev, void *res) |
313 | { | |
314 | regmap_exit(*(struct regmap **)res); | |
315 | } | |
316 | ||
317 | /** | |
318 | * devm_regmap_init(): Initialise managed register map | |
319 | * | |
320 | * @dev: Device that will be interacted with | |
321 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 322 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
323 | * @config: Configuration for register map |
324 | * | |
325 | * The return value will be an ERR_PTR() on error or a valid pointer | |
326 | * to a struct regmap. This function should generally not be called | |
327 | * directly, it should be called by bus-specific init functions. The | |
328 | * map will be automatically freed by the device management code. | |
329 | */ | |
330 | struct regmap *devm_regmap_init(struct device *dev, | |
331 | const struct regmap_bus *bus, | |
0135bbcc | 332 | void *bus_context, |
c0eb4676 MB |
333 | const struct regmap_config *config) |
334 | { | |
335 | struct regmap **ptr, *regmap; | |
336 | ||
337 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
338 | if (!ptr) | |
339 | return ERR_PTR(-ENOMEM); | |
340 | ||
0135bbcc | 341 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
342 | if (!IS_ERR(regmap)) { |
343 | *ptr = regmap; | |
344 | devres_add(dev, ptr); | |
345 | } else { | |
346 | devres_free(ptr); | |
347 | } | |
348 | ||
349 | return regmap; | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
352 | ||
bf315173 MB |
353 | /** |
354 | * regmap_reinit_cache(): Reinitialise the current register cache | |
355 | * | |
356 | * @map: Register map to operate on. | |
357 | * @config: New configuration. Only the cache data will be used. | |
358 | * | |
359 | * Discard any existing register cache for the map and initialize a | |
360 | * new cache. This can be used to restore the cache to defaults or to | |
361 | * update the cache configuration to reflect runtime discovery of the | |
362 | * hardware. | |
363 | */ | |
364 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
365 | { | |
366 | int ret; | |
367 | ||
368 | mutex_lock(&map->lock); | |
369 | ||
370 | regcache_exit(map); | |
a24f64a6 | 371 | regmap_debugfs_exit(map); |
bf315173 MB |
372 | |
373 | map->max_register = config->max_register; | |
374 | map->writeable_reg = config->writeable_reg; | |
375 | map->readable_reg = config->readable_reg; | |
376 | map->volatile_reg = config->volatile_reg; | |
377 | map->precious_reg = config->precious_reg; | |
378 | map->cache_type = config->cache_type; | |
379 | ||
a24f64a6 MB |
380 | regmap_debugfs_init(map); |
381 | ||
421e8d2d MB |
382 | map->cache_bypass = false; |
383 | map->cache_only = false; | |
384 | ||
bf315173 MB |
385 | ret = regcache_init(map, config); |
386 | ||
387 | mutex_unlock(&map->lock); | |
388 | ||
389 | return ret; | |
390 | } | |
391 | ||
b83a313b MB |
392 | /** |
393 | * regmap_exit(): Free a previously allocated register map | |
394 | */ | |
395 | void regmap_exit(struct regmap *map) | |
396 | { | |
5d1729e7 | 397 | regcache_exit(map); |
31244e39 | 398 | regmap_debugfs_exit(map); |
0135bbcc SW |
399 | if (map->bus->free_context) |
400 | map->bus->free_context(map->bus_context); | |
b83a313b | 401 | kfree(map->work_buf); |
b83a313b MB |
402 | kfree(map); |
403 | } | |
404 | EXPORT_SYMBOL_GPL(regmap_exit); | |
405 | ||
406 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
407 | const void *val, size_t val_len) | |
408 | { | |
6f306441 | 409 | u8 *u8 = map->work_buf; |
b83a313b MB |
410 | void *buf; |
411 | int ret = -ENOTSUPP; | |
412 | size_t len; | |
73304781 MB |
413 | int i; |
414 | ||
415 | /* Check for unwritable registers before we start */ | |
416 | if (map->writeable_reg) | |
417 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
418 | if (!map->writeable_reg(map->dev, reg + i)) | |
419 | return -EINVAL; | |
b83a313b | 420 | |
c9157198 LD |
421 | if (!map->cache_bypass && map->format.parse_val) { |
422 | unsigned int ival; | |
423 | int val_bytes = map->format.val_bytes; | |
424 | for (i = 0; i < val_len / val_bytes; i++) { | |
425 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
426 | ival = map->format.parse_val(map->work_buf); | |
427 | ret = regcache_write(map, reg + i, ival); | |
428 | if (ret) { | |
429 | dev_err(map->dev, | |
430 | "Error in caching of register: %u ret: %d\n", | |
431 | reg + i, ret); | |
432 | return ret; | |
433 | } | |
434 | } | |
435 | if (map->cache_only) { | |
436 | map->cache_dirty = true; | |
437 | return 0; | |
438 | } | |
439 | } | |
440 | ||
b83a313b MB |
441 | map->format.format_reg(map->work_buf, reg); |
442 | ||
6f306441 LPC |
443 | u8[0] |= map->write_flag_mask; |
444 | ||
fb2736bb MB |
445 | trace_regmap_hw_write_start(map->dev, reg, |
446 | val_len / map->format.val_bytes); | |
447 | ||
2547e201 MB |
448 | /* If we're doing a single register write we can probably just |
449 | * send the work_buf directly, otherwise try to do a gather | |
450 | * write. | |
451 | */ | |
82159ba8 MB |
452 | if (val == (map->work_buf + map->format.pad_bytes + |
453 | map->format.reg_bytes)) | |
0135bbcc | 454 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
455 | map->format.reg_bytes + |
456 | map->format.pad_bytes + | |
457 | val_len); | |
2547e201 | 458 | else if (map->bus->gather_write) |
0135bbcc | 459 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
460 | map->format.reg_bytes + |
461 | map->format.pad_bytes, | |
b83a313b MB |
462 | val, val_len); |
463 | ||
2547e201 | 464 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 465 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
466 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
467 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
468 | if (!buf) |
469 | return -ENOMEM; | |
470 | ||
471 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
472 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
473 | val, val_len); | |
0135bbcc | 474 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
475 | |
476 | kfree(buf); | |
477 | } | |
478 | ||
fb2736bb MB |
479 | trace_regmap_hw_write_done(map->dev, reg, |
480 | val_len / map->format.val_bytes); | |
481 | ||
b83a313b MB |
482 | return ret; |
483 | } | |
484 | ||
4d2dc095 DP |
485 | int _regmap_write(struct regmap *map, unsigned int reg, |
486 | unsigned int val) | |
b83a313b | 487 | { |
fb2736bb | 488 | int ret; |
b83a313b MB |
489 | BUG_ON(!map->format.format_write && !map->format.format_val); |
490 | ||
c9157198 | 491 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
492 | ret = regcache_write(map, reg, val); |
493 | if (ret != 0) | |
494 | return ret; | |
8ae0d7e8 MB |
495 | if (map->cache_only) { |
496 | map->cache_dirty = true; | |
5d1729e7 | 497 | return 0; |
8ae0d7e8 | 498 | } |
5d1729e7 DP |
499 | } |
500 | ||
fb2736bb MB |
501 | trace_regmap_reg_write(map->dev, reg, val); |
502 | ||
b83a313b MB |
503 | if (map->format.format_write) { |
504 | map->format.format_write(map, reg, val); | |
505 | ||
fb2736bb MB |
506 | trace_regmap_hw_write_start(map->dev, reg, 1); |
507 | ||
0135bbcc | 508 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
509 | map->format.buf_size); |
510 | ||
511 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
512 | ||
513 | return ret; | |
b83a313b | 514 | } else { |
82159ba8 MB |
515 | map->format.format_val(map->work_buf + map->format.reg_bytes |
516 | + map->format.pad_bytes, val); | |
b83a313b | 517 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
518 | map->work_buf + |
519 | map->format.reg_bytes + | |
520 | map->format.pad_bytes, | |
b83a313b MB |
521 | map->format.val_bytes); |
522 | } | |
523 | } | |
524 | ||
525 | /** | |
526 | * regmap_write(): Write a value to a single register | |
527 | * | |
528 | * @map: Register map to write to | |
529 | * @reg: Register to write to | |
530 | * @val: Value to be written | |
531 | * | |
532 | * A value of zero will be returned on success, a negative errno will | |
533 | * be returned in error cases. | |
534 | */ | |
535 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
536 | { | |
537 | int ret; | |
538 | ||
539 | mutex_lock(&map->lock); | |
540 | ||
541 | ret = _regmap_write(map, reg, val); | |
542 | ||
543 | mutex_unlock(&map->lock); | |
544 | ||
545 | return ret; | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(regmap_write); | |
548 | ||
549 | /** | |
550 | * regmap_raw_write(): Write raw values to one or more registers | |
551 | * | |
552 | * @map: Register map to write to | |
553 | * @reg: Initial register to write to | |
554 | * @val: Block of data to be written, laid out for direct transmission to the | |
555 | * device | |
556 | * @val_len: Length of data pointed to by val. | |
557 | * | |
558 | * This function is intended to be used for things like firmware | |
559 | * download where a large block of data needs to be transferred to the | |
560 | * device. No formatting will be done on the data provided. | |
561 | * | |
562 | * A value of zero will be returned on success, a negative errno will | |
563 | * be returned in error cases. | |
564 | */ | |
565 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
566 | const void *val, size_t val_len) | |
567 | { | |
568 | int ret; | |
569 | ||
570 | mutex_lock(&map->lock); | |
571 | ||
572 | ret = _regmap_raw_write(map, reg, val, val_len); | |
573 | ||
574 | mutex_unlock(&map->lock); | |
575 | ||
576 | return ret; | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
579 | ||
8eaeb219 LD |
580 | /* |
581 | * regmap_bulk_write(): Write multiple registers to the device | |
582 | * | |
583 | * @map: Register map to write to | |
584 | * @reg: First register to be write from | |
585 | * @val: Block of data to be written, in native register size for device | |
586 | * @val_count: Number of registers to write | |
587 | * | |
588 | * This function is intended to be used for writing a large block of | |
589 | * data to be device either in single transfer or multiple transfer. | |
590 | * | |
591 | * A value of zero will be returned on success, a negative errno will | |
592 | * be returned in error cases. | |
593 | */ | |
594 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
595 | size_t val_count) | |
596 | { | |
597 | int ret = 0, i; | |
598 | size_t val_bytes = map->format.val_bytes; | |
599 | void *wval; | |
600 | ||
601 | if (!map->format.parse_val) | |
602 | return -EINVAL; | |
603 | ||
604 | mutex_lock(&map->lock); | |
605 | ||
606 | /* No formatting is require if val_byte is 1 */ | |
607 | if (val_bytes == 1) { | |
608 | wval = (void *)val; | |
609 | } else { | |
610 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
611 | if (!wval) { | |
612 | ret = -ENOMEM; | |
613 | dev_err(map->dev, "Error in memory allocation\n"); | |
614 | goto out; | |
615 | } | |
616 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
617 | map->format.parse_val(wval + i); | |
618 | } | |
619 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
620 | ||
621 | if (val_bytes != 1) | |
622 | kfree(wval); | |
623 | ||
624 | out: | |
625 | mutex_unlock(&map->lock); | |
626 | return ret; | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
629 | ||
b83a313b MB |
630 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
631 | unsigned int val_len) | |
632 | { | |
633 | u8 *u8 = map->work_buf; | |
634 | int ret; | |
635 | ||
636 | map->format.format_reg(map->work_buf, reg); | |
637 | ||
638 | /* | |
6f306441 | 639 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
640 | * register addresss; since it's always the high bits for all |
641 | * current formats we can do this here rather than in | |
642 | * formatting. This may break if we get interesting formats. | |
643 | */ | |
6f306441 | 644 | u8[0] |= map->read_flag_mask; |
b83a313b | 645 | |
fb2736bb MB |
646 | trace_regmap_hw_read_start(map->dev, reg, |
647 | val_len / map->format.val_bytes); | |
648 | ||
0135bbcc | 649 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 650 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 651 | val, val_len); |
b83a313b | 652 | |
fb2736bb MB |
653 | trace_regmap_hw_read_done(map->dev, reg, |
654 | val_len / map->format.val_bytes); | |
655 | ||
656 | return ret; | |
b83a313b MB |
657 | } |
658 | ||
659 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
660 | unsigned int *val) | |
661 | { | |
662 | int ret; | |
663 | ||
5d1729e7 DP |
664 | if (!map->cache_bypass) { |
665 | ret = regcache_read(map, reg, val); | |
666 | if (ret == 0) | |
667 | return 0; | |
668 | } | |
669 | ||
19254411 LPC |
670 | if (!map->format.parse_val) |
671 | return -EINVAL; | |
672 | ||
5d1729e7 DP |
673 | if (map->cache_only) |
674 | return -EBUSY; | |
675 | ||
b83a313b | 676 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 677 | if (ret == 0) { |
b83a313b | 678 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
679 | trace_regmap_reg_read(map->dev, reg, *val); |
680 | } | |
b83a313b MB |
681 | |
682 | return ret; | |
683 | } | |
684 | ||
685 | /** | |
686 | * regmap_read(): Read a value from a single register | |
687 | * | |
688 | * @map: Register map to write to | |
689 | * @reg: Register to be read from | |
690 | * @val: Pointer to store read value | |
691 | * | |
692 | * A value of zero will be returned on success, a negative errno will | |
693 | * be returned in error cases. | |
694 | */ | |
695 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
696 | { | |
697 | int ret; | |
698 | ||
699 | mutex_lock(&map->lock); | |
700 | ||
701 | ret = _regmap_read(map, reg, val); | |
702 | ||
703 | mutex_unlock(&map->lock); | |
704 | ||
705 | return ret; | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(regmap_read); | |
708 | ||
709 | /** | |
710 | * regmap_raw_read(): Read raw data from the device | |
711 | * | |
712 | * @map: Register map to write to | |
713 | * @reg: First register to be read from | |
714 | * @val: Pointer to store read value | |
715 | * @val_len: Size of data to read | |
716 | * | |
717 | * A value of zero will be returned on success, a negative errno will | |
718 | * be returned in error cases. | |
719 | */ | |
720 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
721 | size_t val_len) | |
722 | { | |
b8fb5ab1 MB |
723 | size_t val_bytes = map->format.val_bytes; |
724 | size_t val_count = val_len / val_bytes; | |
725 | unsigned int v; | |
726 | int ret, i; | |
04e016ad | 727 | |
b83a313b MB |
728 | mutex_lock(&map->lock); |
729 | ||
b8fb5ab1 MB |
730 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
731 | map->cache_type == REGCACHE_NONE) { | |
732 | /* Physical block read if there's no cache involved */ | |
733 | ret = _regmap_raw_read(map, reg, val, val_len); | |
734 | ||
735 | } else { | |
736 | /* Otherwise go word by word for the cache; should be low | |
737 | * cost as we expect to hit the cache. | |
738 | */ | |
739 | for (i = 0; i < val_count; i++) { | |
740 | ret = _regmap_read(map, reg + i, &v); | |
741 | if (ret != 0) | |
742 | goto out; | |
743 | ||
744 | map->format.format_val(val + (i * val_bytes), v); | |
745 | } | |
746 | } | |
b83a313b | 747 | |
b8fb5ab1 | 748 | out: |
b83a313b MB |
749 | mutex_unlock(&map->lock); |
750 | ||
751 | return ret; | |
752 | } | |
753 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
754 | ||
755 | /** | |
756 | * regmap_bulk_read(): Read multiple registers from the device | |
757 | * | |
758 | * @map: Register map to write to | |
759 | * @reg: First register to be read from | |
760 | * @val: Pointer to store read value, in native register size for device | |
761 | * @val_count: Number of registers to read | |
762 | * | |
763 | * A value of zero will be returned on success, a negative errno will | |
764 | * be returned in error cases. | |
765 | */ | |
766 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
767 | size_t val_count) | |
768 | { | |
769 | int ret, i; | |
770 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 771 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 772 | |
b83a313b MB |
773 | if (!map->format.parse_val) |
774 | return -EINVAL; | |
775 | ||
de2d808f MB |
776 | if (vol || map->cache_type == REGCACHE_NONE) { |
777 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
778 | if (ret != 0) | |
779 | return ret; | |
780 | ||
781 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
782 | map->format.parse_val(val + i); | |
783 | } else { | |
784 | for (i = 0; i < val_count; i++) { | |
785 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
786 | if (ret != 0) | |
787 | return ret; | |
788 | } | |
789 | } | |
b83a313b MB |
790 | |
791 | return 0; | |
792 | } | |
793 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
794 | ||
018690d3 MB |
795 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
796 | unsigned int mask, unsigned int val, | |
797 | bool *change) | |
b83a313b MB |
798 | { |
799 | int ret; | |
d91e8db2 | 800 | unsigned int tmp, orig; |
b83a313b MB |
801 | |
802 | mutex_lock(&map->lock); | |
803 | ||
d91e8db2 | 804 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
805 | if (ret != 0) |
806 | goto out; | |
807 | ||
d91e8db2 | 808 | tmp = orig & ~mask; |
b83a313b MB |
809 | tmp |= val & mask; |
810 | ||
018690d3 | 811 | if (tmp != orig) { |
d91e8db2 | 812 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
813 | *change = true; |
814 | } else { | |
815 | *change = false; | |
816 | } | |
b83a313b MB |
817 | |
818 | out: | |
819 | mutex_unlock(&map->lock); | |
820 | ||
821 | return ret; | |
822 | } | |
018690d3 MB |
823 | |
824 | /** | |
825 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
826 | * | |
827 | * @map: Register map to update | |
828 | * @reg: Register to update | |
829 | * @mask: Bitmask to change | |
830 | * @val: New value for bitmask | |
831 | * | |
832 | * Returns zero for success, a negative number on error. | |
833 | */ | |
834 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
835 | unsigned int mask, unsigned int val) | |
836 | { | |
837 | bool change; | |
838 | return _regmap_update_bits(map, reg, mask, val, &change); | |
839 | } | |
b83a313b | 840 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 841 | |
018690d3 MB |
842 | /** |
843 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
844 | * register map and report if updated | |
845 | * | |
846 | * @map: Register map to update | |
847 | * @reg: Register to update | |
848 | * @mask: Bitmask to change | |
849 | * @val: New value for bitmask | |
850 | * @change: Boolean indicating if a write was done | |
851 | * | |
852 | * Returns zero for success, a negative number on error. | |
853 | */ | |
854 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
855 | unsigned int mask, unsigned int val, | |
856 | bool *change) | |
857 | { | |
858 | return _regmap_update_bits(map, reg, mask, val, change); | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
861 | ||
22f0d90a MB |
862 | /** |
863 | * regmap_register_patch: Register and apply register updates to be applied | |
864 | * on device initialistion | |
865 | * | |
866 | * @map: Register map to apply updates to. | |
867 | * @regs: Values to update. | |
868 | * @num_regs: Number of entries in regs. | |
869 | * | |
870 | * Register a set of register updates to be applied to the device | |
871 | * whenever the device registers are synchronised with the cache and | |
872 | * apply them immediately. Typically this is used to apply | |
873 | * corrections to be applied to the device defaults on startup, such | |
874 | * as the updates some vendors provide to undocumented registers. | |
875 | */ | |
876 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
877 | int num_regs) | |
878 | { | |
879 | int i, ret; | |
880 | bool bypass; | |
881 | ||
882 | /* If needed the implementation can be extended to support this */ | |
883 | if (map->patch) | |
884 | return -EBUSY; | |
885 | ||
886 | mutex_lock(&map->lock); | |
887 | ||
888 | bypass = map->cache_bypass; | |
889 | ||
890 | map->cache_bypass = true; | |
891 | ||
892 | /* Write out first; it's useful to apply even if we fail later. */ | |
893 | for (i = 0; i < num_regs; i++) { | |
894 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
895 | if (ret != 0) { | |
896 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
897 | regs[i].reg, regs[i].def, ret); | |
898 | goto out; | |
899 | } | |
900 | } | |
901 | ||
2a14d7d9 | 902 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
903 | if (map->patch != NULL) { |
904 | memcpy(map->patch, regs, | |
905 | num_regs * sizeof(struct reg_default)); | |
906 | map->patch_regs = num_regs; | |
907 | } else { | |
908 | ret = -ENOMEM; | |
909 | } | |
910 | ||
911 | out: | |
912 | map->cache_bypass = bypass; | |
913 | ||
914 | mutex_unlock(&map->lock); | |
915 | ||
916 | return ret; | |
917 | } | |
918 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
919 | ||
eae4b51b | 920 | /* |
a6539c32 MB |
921 | * regmap_get_val_bytes(): Report the size of a register value |
922 | * | |
923 | * Report the size of a register value, mainly intended to for use by | |
924 | * generic infrastructure built on top of regmap. | |
925 | */ | |
926 | int regmap_get_val_bytes(struct regmap *map) | |
927 | { | |
928 | if (map->format.format_write) | |
929 | return -EINVAL; | |
930 | ||
931 | return map->format.val_bytes; | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
934 | ||
31244e39 MB |
935 | static int __init regmap_initcall(void) |
936 | { | |
937 | regmap_debugfs_initcall(); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | postcore_initcall(regmap_initcall); |