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 | ||
bacdbe07 SW |
161 | static void regmap_lock_mutex(struct regmap *map) |
162 | { | |
163 | mutex_lock(&map->mutex); | |
164 | } | |
165 | ||
166 | static void regmap_unlock_mutex(struct regmap *map) | |
167 | { | |
168 | mutex_unlock(&map->mutex); | |
169 | } | |
170 | ||
171 | static void regmap_lock_spinlock(struct regmap *map) | |
172 | { | |
173 | spin_lock(&map->spinlock); | |
174 | } | |
175 | ||
176 | static void regmap_unlock_spinlock(struct regmap *map) | |
177 | { | |
178 | spin_unlock(&map->spinlock); | |
179 | } | |
180 | ||
b83a313b MB |
181 | /** |
182 | * regmap_init(): Initialise register map | |
183 | * | |
184 | * @dev: Device that will be interacted with | |
185 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 186 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
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, | |
0135bbcc | 195 | void *bus_context, |
b83a313b MB |
196 | const struct regmap_config *config) |
197 | { | |
198 | struct regmap *map; | |
199 | int ret = -EINVAL; | |
200 | ||
201 | if (!bus || !config) | |
abbb18fb | 202 | goto err; |
b83a313b MB |
203 | |
204 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
205 | if (map == NULL) { | |
206 | ret = -ENOMEM; | |
207 | goto err; | |
208 | } | |
209 | ||
bacdbe07 SW |
210 | if (bus->fast_io) { |
211 | spin_lock_init(&map->spinlock); | |
212 | map->lock = regmap_lock_spinlock; | |
213 | map->unlock = regmap_unlock_spinlock; | |
214 | } else { | |
215 | mutex_init(&map->mutex); | |
216 | map->lock = regmap_lock_mutex; | |
217 | map->unlock = regmap_unlock_mutex; | |
218 | } | |
b83a313b | 219 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; |
c212accc | 220 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 221 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 222 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 223 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
224 | map->dev = dev; |
225 | map->bus = bus; | |
0135bbcc | 226 | map->bus_context = bus_context; |
2e2ae66d MB |
227 | map->max_register = config->max_register; |
228 | map->writeable_reg = config->writeable_reg; | |
229 | map->readable_reg = config->readable_reg; | |
230 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 231 | map->precious_reg = config->precious_reg; |
5d1729e7 | 232 | map->cache_type = config->cache_type; |
b83a313b | 233 | |
6f306441 LPC |
234 | if (config->read_flag_mask || config->write_flag_mask) { |
235 | map->read_flag_mask = config->read_flag_mask; | |
236 | map->write_flag_mask = config->write_flag_mask; | |
237 | } else { | |
238 | map->read_flag_mask = bus->read_flag_mask; | |
239 | } | |
240 | ||
b83a313b | 241 | switch (config->reg_bits) { |
9aa50750 WS |
242 | case 2: |
243 | switch (config->val_bits) { | |
244 | case 6: | |
245 | map->format.format_write = regmap_format_2_6_write; | |
246 | break; | |
247 | default: | |
248 | goto err_map; | |
249 | } | |
250 | break; | |
251 | ||
b83a313b MB |
252 | case 4: |
253 | switch (config->val_bits) { | |
254 | case 12: | |
255 | map->format.format_write = regmap_format_4_12_write; | |
256 | break; | |
257 | default: | |
258 | goto err_map; | |
259 | } | |
260 | break; | |
261 | ||
262 | case 7: | |
263 | switch (config->val_bits) { | |
264 | case 9: | |
265 | map->format.format_write = regmap_format_7_9_write; | |
266 | break; | |
267 | default: | |
268 | goto err_map; | |
269 | } | |
270 | break; | |
271 | ||
7e5ec63e LPC |
272 | case 10: |
273 | switch (config->val_bits) { | |
274 | case 14: | |
275 | map->format.format_write = regmap_format_10_14_write; | |
276 | break; | |
277 | default: | |
278 | goto err_map; | |
279 | } | |
280 | break; | |
281 | ||
b83a313b MB |
282 | case 8: |
283 | map->format.format_reg = regmap_format_8; | |
284 | break; | |
285 | ||
286 | case 16: | |
287 | map->format.format_reg = regmap_format_16; | |
288 | break; | |
289 | ||
7d5e525b MB |
290 | case 32: |
291 | map->format.format_reg = regmap_format_32; | |
292 | break; | |
293 | ||
b83a313b MB |
294 | default: |
295 | goto err_map; | |
296 | } | |
297 | ||
298 | switch (config->val_bits) { | |
299 | case 8: | |
300 | map->format.format_val = regmap_format_8; | |
301 | map->format.parse_val = regmap_parse_8; | |
302 | break; | |
303 | case 16: | |
304 | map->format.format_val = regmap_format_16; | |
305 | map->format.parse_val = regmap_parse_16; | |
306 | break; | |
7d5e525b MB |
307 | case 32: |
308 | map->format.format_val = regmap_format_32; | |
309 | map->format.parse_val = regmap_parse_32; | |
310 | break; | |
b83a313b MB |
311 | } |
312 | ||
313 | if (!map->format.format_write && | |
314 | !(map->format.format_reg && map->format.format_val)) | |
315 | goto err_map; | |
316 | ||
82159ba8 | 317 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
318 | if (map->work_buf == NULL) { |
319 | ret = -ENOMEM; | |
5204f5e3 | 320 | goto err_map; |
b83a313b MB |
321 | } |
322 | ||
052d2cd1 MB |
323 | regmap_debugfs_init(map); |
324 | ||
e5e3b8ab | 325 | ret = regcache_init(map, config); |
5d1729e7 | 326 | if (ret < 0) |
58072cbf | 327 | goto err_free_workbuf; |
5d1729e7 | 328 | |
b83a313b MB |
329 | return map; |
330 | ||
58072cbf LPC |
331 | err_free_workbuf: |
332 | kfree(map->work_buf); | |
b83a313b MB |
333 | err_map: |
334 | kfree(map); | |
335 | err: | |
336 | return ERR_PTR(ret); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(regmap_init); | |
339 | ||
c0eb4676 MB |
340 | static void devm_regmap_release(struct device *dev, void *res) |
341 | { | |
342 | regmap_exit(*(struct regmap **)res); | |
343 | } | |
344 | ||
345 | /** | |
346 | * devm_regmap_init(): Initialise managed register map | |
347 | * | |
348 | * @dev: Device that will be interacted with | |
349 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 350 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
351 | * @config: Configuration for register map |
352 | * | |
353 | * The return value will be an ERR_PTR() on error or a valid pointer | |
354 | * to a struct regmap. This function should generally not be called | |
355 | * directly, it should be called by bus-specific init functions. The | |
356 | * map will be automatically freed by the device management code. | |
357 | */ | |
358 | struct regmap *devm_regmap_init(struct device *dev, | |
359 | const struct regmap_bus *bus, | |
0135bbcc | 360 | void *bus_context, |
c0eb4676 MB |
361 | const struct regmap_config *config) |
362 | { | |
363 | struct regmap **ptr, *regmap; | |
364 | ||
365 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
366 | if (!ptr) | |
367 | return ERR_PTR(-ENOMEM); | |
368 | ||
0135bbcc | 369 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
370 | if (!IS_ERR(regmap)) { |
371 | *ptr = regmap; | |
372 | devres_add(dev, ptr); | |
373 | } else { | |
374 | devres_free(ptr); | |
375 | } | |
376 | ||
377 | return regmap; | |
378 | } | |
379 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
380 | ||
bf315173 MB |
381 | /** |
382 | * regmap_reinit_cache(): Reinitialise the current register cache | |
383 | * | |
384 | * @map: Register map to operate on. | |
385 | * @config: New configuration. Only the cache data will be used. | |
386 | * | |
387 | * Discard any existing register cache for the map and initialize a | |
388 | * new cache. This can be used to restore the cache to defaults or to | |
389 | * update the cache configuration to reflect runtime discovery of the | |
390 | * hardware. | |
391 | */ | |
392 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
393 | { | |
394 | int ret; | |
395 | ||
bacdbe07 | 396 | map->lock(map); |
bf315173 MB |
397 | |
398 | regcache_exit(map); | |
a24f64a6 | 399 | regmap_debugfs_exit(map); |
bf315173 MB |
400 | |
401 | map->max_register = config->max_register; | |
402 | map->writeable_reg = config->writeable_reg; | |
403 | map->readable_reg = config->readable_reg; | |
404 | map->volatile_reg = config->volatile_reg; | |
405 | map->precious_reg = config->precious_reg; | |
406 | map->cache_type = config->cache_type; | |
407 | ||
a24f64a6 MB |
408 | regmap_debugfs_init(map); |
409 | ||
421e8d2d MB |
410 | map->cache_bypass = false; |
411 | map->cache_only = false; | |
412 | ||
bf315173 MB |
413 | ret = regcache_init(map, config); |
414 | ||
bacdbe07 | 415 | map->unlock(map); |
bf315173 MB |
416 | |
417 | return ret; | |
418 | } | |
419 | ||
b83a313b MB |
420 | /** |
421 | * regmap_exit(): Free a previously allocated register map | |
422 | */ | |
423 | void regmap_exit(struct regmap *map) | |
424 | { | |
5d1729e7 | 425 | regcache_exit(map); |
31244e39 | 426 | regmap_debugfs_exit(map); |
0135bbcc SW |
427 | if (map->bus->free_context) |
428 | map->bus->free_context(map->bus_context); | |
b83a313b | 429 | kfree(map->work_buf); |
b83a313b MB |
430 | kfree(map); |
431 | } | |
432 | EXPORT_SYMBOL_GPL(regmap_exit); | |
433 | ||
434 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
435 | const void *val, size_t val_len) | |
436 | { | |
6f306441 | 437 | u8 *u8 = map->work_buf; |
b83a313b MB |
438 | void *buf; |
439 | int ret = -ENOTSUPP; | |
440 | size_t len; | |
73304781 MB |
441 | int i; |
442 | ||
443 | /* Check for unwritable registers before we start */ | |
444 | if (map->writeable_reg) | |
445 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
446 | if (!map->writeable_reg(map->dev, reg + i)) | |
447 | return -EINVAL; | |
b83a313b | 448 | |
c9157198 LD |
449 | if (!map->cache_bypass && map->format.parse_val) { |
450 | unsigned int ival; | |
451 | int val_bytes = map->format.val_bytes; | |
452 | for (i = 0; i < val_len / val_bytes; i++) { | |
453 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
454 | ival = map->format.parse_val(map->work_buf); | |
455 | ret = regcache_write(map, reg + i, ival); | |
456 | if (ret) { | |
457 | dev_err(map->dev, | |
458 | "Error in caching of register: %u ret: %d\n", | |
459 | reg + i, ret); | |
460 | return ret; | |
461 | } | |
462 | } | |
463 | if (map->cache_only) { | |
464 | map->cache_dirty = true; | |
465 | return 0; | |
466 | } | |
467 | } | |
468 | ||
b83a313b MB |
469 | map->format.format_reg(map->work_buf, reg); |
470 | ||
6f306441 LPC |
471 | u8[0] |= map->write_flag_mask; |
472 | ||
fb2736bb MB |
473 | trace_regmap_hw_write_start(map->dev, reg, |
474 | val_len / map->format.val_bytes); | |
475 | ||
2547e201 MB |
476 | /* If we're doing a single register write we can probably just |
477 | * send the work_buf directly, otherwise try to do a gather | |
478 | * write. | |
479 | */ | |
82159ba8 MB |
480 | if (val == (map->work_buf + map->format.pad_bytes + |
481 | map->format.reg_bytes)) | |
0135bbcc | 482 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
483 | map->format.reg_bytes + |
484 | map->format.pad_bytes + | |
485 | val_len); | |
2547e201 | 486 | else if (map->bus->gather_write) |
0135bbcc | 487 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
488 | map->format.reg_bytes + |
489 | map->format.pad_bytes, | |
b83a313b MB |
490 | val, val_len); |
491 | ||
2547e201 | 492 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 493 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
494 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
495 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
496 | if (!buf) |
497 | return -ENOMEM; | |
498 | ||
499 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
500 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
501 | val, val_len); | |
0135bbcc | 502 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
503 | |
504 | kfree(buf); | |
505 | } | |
506 | ||
fb2736bb MB |
507 | trace_regmap_hw_write_done(map->dev, reg, |
508 | val_len / map->format.val_bytes); | |
509 | ||
b83a313b MB |
510 | return ret; |
511 | } | |
512 | ||
4d2dc095 DP |
513 | int _regmap_write(struct regmap *map, unsigned int reg, |
514 | unsigned int val) | |
b83a313b | 515 | { |
fb2736bb | 516 | int ret; |
b83a313b MB |
517 | BUG_ON(!map->format.format_write && !map->format.format_val); |
518 | ||
c9157198 | 519 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
520 | ret = regcache_write(map, reg, val); |
521 | if (ret != 0) | |
522 | return ret; | |
8ae0d7e8 MB |
523 | if (map->cache_only) { |
524 | map->cache_dirty = true; | |
5d1729e7 | 525 | return 0; |
8ae0d7e8 | 526 | } |
5d1729e7 DP |
527 | } |
528 | ||
fb2736bb MB |
529 | trace_regmap_reg_write(map->dev, reg, val); |
530 | ||
b83a313b MB |
531 | if (map->format.format_write) { |
532 | map->format.format_write(map, reg, val); | |
533 | ||
fb2736bb MB |
534 | trace_regmap_hw_write_start(map->dev, reg, 1); |
535 | ||
0135bbcc | 536 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
537 | map->format.buf_size); |
538 | ||
539 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
540 | ||
541 | return ret; | |
b83a313b | 542 | } else { |
82159ba8 MB |
543 | map->format.format_val(map->work_buf + map->format.reg_bytes |
544 | + map->format.pad_bytes, val); | |
b83a313b | 545 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
546 | map->work_buf + |
547 | map->format.reg_bytes + | |
548 | map->format.pad_bytes, | |
b83a313b MB |
549 | map->format.val_bytes); |
550 | } | |
551 | } | |
552 | ||
553 | /** | |
554 | * regmap_write(): Write a value to a single register | |
555 | * | |
556 | * @map: Register map to write to | |
557 | * @reg: Register to write to | |
558 | * @val: Value to be written | |
559 | * | |
560 | * A value of zero will be returned on success, a negative errno will | |
561 | * be returned in error cases. | |
562 | */ | |
563 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
564 | { | |
565 | int ret; | |
566 | ||
bacdbe07 | 567 | map->lock(map); |
b83a313b MB |
568 | |
569 | ret = _regmap_write(map, reg, val); | |
570 | ||
bacdbe07 | 571 | map->unlock(map); |
b83a313b MB |
572 | |
573 | return ret; | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(regmap_write); | |
576 | ||
577 | /** | |
578 | * regmap_raw_write(): Write raw values to one or more registers | |
579 | * | |
580 | * @map: Register map to write to | |
581 | * @reg: Initial register to write to | |
582 | * @val: Block of data to be written, laid out for direct transmission to the | |
583 | * device | |
584 | * @val_len: Length of data pointed to by val. | |
585 | * | |
586 | * This function is intended to be used for things like firmware | |
587 | * download where a large block of data needs to be transferred to the | |
588 | * device. No formatting will be done on the data provided. | |
589 | * | |
590 | * A value of zero will be returned on success, a negative errno will | |
591 | * be returned in error cases. | |
592 | */ | |
593 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
594 | const void *val, size_t val_len) | |
595 | { | |
596 | int ret; | |
597 | ||
bacdbe07 | 598 | map->lock(map); |
b83a313b MB |
599 | |
600 | ret = _regmap_raw_write(map, reg, val, val_len); | |
601 | ||
bacdbe07 | 602 | map->unlock(map); |
b83a313b MB |
603 | |
604 | return ret; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
607 | ||
8eaeb219 LD |
608 | /* |
609 | * regmap_bulk_write(): Write multiple registers to the device | |
610 | * | |
611 | * @map: Register map to write to | |
612 | * @reg: First register to be write from | |
613 | * @val: Block of data to be written, in native register size for device | |
614 | * @val_count: Number of registers to write | |
615 | * | |
616 | * This function is intended to be used for writing a large block of | |
617 | * data to be device either in single transfer or multiple transfer. | |
618 | * | |
619 | * A value of zero will be returned on success, a negative errno will | |
620 | * be returned in error cases. | |
621 | */ | |
622 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
623 | size_t val_count) | |
624 | { | |
625 | int ret = 0, i; | |
626 | size_t val_bytes = map->format.val_bytes; | |
627 | void *wval; | |
628 | ||
629 | if (!map->format.parse_val) | |
630 | return -EINVAL; | |
631 | ||
bacdbe07 | 632 | map->lock(map); |
8eaeb219 LD |
633 | |
634 | /* No formatting is require if val_byte is 1 */ | |
635 | if (val_bytes == 1) { | |
636 | wval = (void *)val; | |
637 | } else { | |
638 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
639 | if (!wval) { | |
640 | ret = -ENOMEM; | |
641 | dev_err(map->dev, "Error in memory allocation\n"); | |
642 | goto out; | |
643 | } | |
644 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
645 | map->format.parse_val(wval + i); | |
646 | } | |
647 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
648 | ||
649 | if (val_bytes != 1) | |
650 | kfree(wval); | |
651 | ||
652 | out: | |
bacdbe07 | 653 | map->unlock(map); |
8eaeb219 LD |
654 | return ret; |
655 | } | |
656 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
657 | ||
b83a313b MB |
658 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
659 | unsigned int val_len) | |
660 | { | |
661 | u8 *u8 = map->work_buf; | |
662 | int ret; | |
663 | ||
664 | map->format.format_reg(map->work_buf, reg); | |
665 | ||
666 | /* | |
6f306441 | 667 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
668 | * register addresss; since it's always the high bits for all |
669 | * current formats we can do this here rather than in | |
670 | * formatting. This may break if we get interesting formats. | |
671 | */ | |
6f306441 | 672 | u8[0] |= map->read_flag_mask; |
b83a313b | 673 | |
fb2736bb MB |
674 | trace_regmap_hw_read_start(map->dev, reg, |
675 | val_len / map->format.val_bytes); | |
676 | ||
0135bbcc | 677 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 678 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 679 | val, val_len); |
b83a313b | 680 | |
fb2736bb MB |
681 | trace_regmap_hw_read_done(map->dev, reg, |
682 | val_len / map->format.val_bytes); | |
683 | ||
684 | return ret; | |
b83a313b MB |
685 | } |
686 | ||
687 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
688 | unsigned int *val) | |
689 | { | |
690 | int ret; | |
691 | ||
5d1729e7 DP |
692 | if (!map->cache_bypass) { |
693 | ret = regcache_read(map, reg, val); | |
694 | if (ret == 0) | |
695 | return 0; | |
696 | } | |
697 | ||
19254411 LPC |
698 | if (!map->format.parse_val) |
699 | return -EINVAL; | |
700 | ||
5d1729e7 DP |
701 | if (map->cache_only) |
702 | return -EBUSY; | |
703 | ||
b83a313b | 704 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 705 | if (ret == 0) { |
b83a313b | 706 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
707 | trace_regmap_reg_read(map->dev, reg, *val); |
708 | } | |
b83a313b MB |
709 | |
710 | return ret; | |
711 | } | |
712 | ||
713 | /** | |
714 | * regmap_read(): Read a value from a single register | |
715 | * | |
716 | * @map: Register map to write to | |
717 | * @reg: Register to be read from | |
718 | * @val: Pointer to store read value | |
719 | * | |
720 | * A value of zero will be returned on success, a negative errno will | |
721 | * be returned in error cases. | |
722 | */ | |
723 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
724 | { | |
725 | int ret; | |
726 | ||
bacdbe07 | 727 | map->lock(map); |
b83a313b MB |
728 | |
729 | ret = _regmap_read(map, reg, val); | |
730 | ||
bacdbe07 | 731 | map->unlock(map); |
b83a313b MB |
732 | |
733 | return ret; | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(regmap_read); | |
736 | ||
737 | /** | |
738 | * regmap_raw_read(): Read raw data from the device | |
739 | * | |
740 | * @map: Register map to write to | |
741 | * @reg: First register to be read from | |
742 | * @val: Pointer to store read value | |
743 | * @val_len: Size of data to read | |
744 | * | |
745 | * A value of zero will be returned on success, a negative errno will | |
746 | * be returned in error cases. | |
747 | */ | |
748 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
749 | size_t val_len) | |
750 | { | |
b8fb5ab1 MB |
751 | size_t val_bytes = map->format.val_bytes; |
752 | size_t val_count = val_len / val_bytes; | |
753 | unsigned int v; | |
754 | int ret, i; | |
04e016ad | 755 | |
bacdbe07 | 756 | map->lock(map); |
b83a313b | 757 | |
b8fb5ab1 MB |
758 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
759 | map->cache_type == REGCACHE_NONE) { | |
760 | /* Physical block read if there's no cache involved */ | |
761 | ret = _regmap_raw_read(map, reg, val, val_len); | |
762 | ||
763 | } else { | |
764 | /* Otherwise go word by word for the cache; should be low | |
765 | * cost as we expect to hit the cache. | |
766 | */ | |
767 | for (i = 0; i < val_count; i++) { | |
768 | ret = _regmap_read(map, reg + i, &v); | |
769 | if (ret != 0) | |
770 | goto out; | |
771 | ||
772 | map->format.format_val(val + (i * val_bytes), v); | |
773 | } | |
774 | } | |
b83a313b | 775 | |
b8fb5ab1 | 776 | out: |
bacdbe07 | 777 | map->unlock(map); |
b83a313b MB |
778 | |
779 | return ret; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
782 | ||
783 | /** | |
784 | * regmap_bulk_read(): Read multiple registers from the device | |
785 | * | |
786 | * @map: Register map to write to | |
787 | * @reg: First register to be read from | |
788 | * @val: Pointer to store read value, in native register size for device | |
789 | * @val_count: Number of registers to read | |
790 | * | |
791 | * A value of zero will be returned on success, a negative errno will | |
792 | * be returned in error cases. | |
793 | */ | |
794 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
795 | size_t val_count) | |
796 | { | |
797 | int ret, i; | |
798 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 799 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 800 | |
b83a313b MB |
801 | if (!map->format.parse_val) |
802 | return -EINVAL; | |
803 | ||
de2d808f MB |
804 | if (vol || map->cache_type == REGCACHE_NONE) { |
805 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
806 | if (ret != 0) | |
807 | return ret; | |
808 | ||
809 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
810 | map->format.parse_val(val + i); | |
811 | } else { | |
812 | for (i = 0; i < val_count; i++) { | |
813 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
814 | if (ret != 0) | |
815 | return ret; | |
816 | } | |
817 | } | |
b83a313b MB |
818 | |
819 | return 0; | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
822 | ||
018690d3 MB |
823 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
824 | unsigned int mask, unsigned int val, | |
825 | bool *change) | |
b83a313b MB |
826 | { |
827 | int ret; | |
d91e8db2 | 828 | unsigned int tmp, orig; |
b83a313b | 829 | |
bacdbe07 | 830 | map->lock(map); |
b83a313b | 831 | |
d91e8db2 | 832 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
833 | if (ret != 0) |
834 | goto out; | |
835 | ||
d91e8db2 | 836 | tmp = orig & ~mask; |
b83a313b MB |
837 | tmp |= val & mask; |
838 | ||
018690d3 | 839 | if (tmp != orig) { |
d91e8db2 | 840 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
841 | *change = true; |
842 | } else { | |
843 | *change = false; | |
844 | } | |
b83a313b MB |
845 | |
846 | out: | |
bacdbe07 | 847 | map->unlock(map); |
b83a313b MB |
848 | |
849 | return ret; | |
850 | } | |
018690d3 MB |
851 | |
852 | /** | |
853 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
854 | * | |
855 | * @map: Register map to update | |
856 | * @reg: Register to update | |
857 | * @mask: Bitmask to change | |
858 | * @val: New value for bitmask | |
859 | * | |
860 | * Returns zero for success, a negative number on error. | |
861 | */ | |
862 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
863 | unsigned int mask, unsigned int val) | |
864 | { | |
865 | bool change; | |
866 | return _regmap_update_bits(map, reg, mask, val, &change); | |
867 | } | |
b83a313b | 868 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 869 | |
018690d3 MB |
870 | /** |
871 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
872 | * register map and report if updated | |
873 | * | |
874 | * @map: Register map to update | |
875 | * @reg: Register to update | |
876 | * @mask: Bitmask to change | |
877 | * @val: New value for bitmask | |
878 | * @change: Boolean indicating if a write was done | |
879 | * | |
880 | * Returns zero for success, a negative number on error. | |
881 | */ | |
882 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
883 | unsigned int mask, unsigned int val, | |
884 | bool *change) | |
885 | { | |
886 | return _regmap_update_bits(map, reg, mask, val, change); | |
887 | } | |
888 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
889 | ||
22f0d90a MB |
890 | /** |
891 | * regmap_register_patch: Register and apply register updates to be applied | |
892 | * on device initialistion | |
893 | * | |
894 | * @map: Register map to apply updates to. | |
895 | * @regs: Values to update. | |
896 | * @num_regs: Number of entries in regs. | |
897 | * | |
898 | * Register a set of register updates to be applied to the device | |
899 | * whenever the device registers are synchronised with the cache and | |
900 | * apply them immediately. Typically this is used to apply | |
901 | * corrections to be applied to the device defaults on startup, such | |
902 | * as the updates some vendors provide to undocumented registers. | |
903 | */ | |
904 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
905 | int num_regs) | |
906 | { | |
907 | int i, ret; | |
908 | bool bypass; | |
909 | ||
910 | /* If needed the implementation can be extended to support this */ | |
911 | if (map->patch) | |
912 | return -EBUSY; | |
913 | ||
bacdbe07 | 914 | map->lock(map); |
22f0d90a MB |
915 | |
916 | bypass = map->cache_bypass; | |
917 | ||
918 | map->cache_bypass = true; | |
919 | ||
920 | /* Write out first; it's useful to apply even if we fail later. */ | |
921 | for (i = 0; i < num_regs; i++) { | |
922 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
923 | if (ret != 0) { | |
924 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
925 | regs[i].reg, regs[i].def, ret); | |
926 | goto out; | |
927 | } | |
928 | } | |
929 | ||
2a14d7d9 | 930 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
931 | if (map->patch != NULL) { |
932 | memcpy(map->patch, regs, | |
933 | num_regs * sizeof(struct reg_default)); | |
934 | map->patch_regs = num_regs; | |
935 | } else { | |
936 | ret = -ENOMEM; | |
937 | } | |
938 | ||
939 | out: | |
940 | map->cache_bypass = bypass; | |
941 | ||
bacdbe07 | 942 | map->unlock(map); |
22f0d90a MB |
943 | |
944 | return ret; | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
947 | ||
eae4b51b | 948 | /* |
a6539c32 MB |
949 | * regmap_get_val_bytes(): Report the size of a register value |
950 | * | |
951 | * Report the size of a register value, mainly intended to for use by | |
952 | * generic infrastructure built on top of regmap. | |
953 | */ | |
954 | int regmap_get_val_bytes(struct regmap *map) | |
955 | { | |
956 | if (map->format.format_write) | |
957 | return -EINVAL; | |
958 | ||
959 | return map->format.val_bytes; | |
960 | } | |
961 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
962 | ||
31244e39 MB |
963 | static int __init regmap_initcall(void) |
964 | { | |
965 | regmap_debugfs_initcall(); | |
966 | ||
967 | return 0; | |
968 | } | |
969 | postcore_initcall(regmap_initcall); |