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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 | ||
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 | ||
bacdbe07 SW |
182 | static void regmap_lock_mutex(struct regmap *map) |
183 | { | |
184 | mutex_lock(&map->mutex); | |
185 | } | |
186 | ||
187 | static void regmap_unlock_mutex(struct regmap *map) | |
188 | { | |
189 | mutex_unlock(&map->mutex); | |
190 | } | |
191 | ||
192 | static void regmap_lock_spinlock(struct regmap *map) | |
193 | { | |
194 | spin_lock(&map->spinlock); | |
195 | } | |
196 | ||
197 | static void regmap_unlock_spinlock(struct regmap *map) | |
198 | { | |
199 | spin_unlock(&map->spinlock); | |
200 | } | |
201 | ||
72b39f6f MB |
202 | static void dev_get_regmap_release(struct device *dev, void *res) |
203 | { | |
204 | /* | |
205 | * We don't actually have anything to do here; the goal here | |
206 | * is not to manage the regmap but to provide a simple way to | |
207 | * get the regmap back given a struct device. | |
208 | */ | |
209 | } | |
210 | ||
b83a313b MB |
211 | /** |
212 | * regmap_init(): Initialise register map | |
213 | * | |
214 | * @dev: Device that will be interacted with | |
215 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 216 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
217 | * @config: Configuration for register map |
218 | * | |
219 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
220 | * a struct regmap. This function should generally not be called | |
221 | * directly, it should be called by bus-specific init functions. | |
222 | */ | |
223 | struct regmap *regmap_init(struct device *dev, | |
224 | const struct regmap_bus *bus, | |
0135bbcc | 225 | void *bus_context, |
b83a313b MB |
226 | const struct regmap_config *config) |
227 | { | |
72b39f6f | 228 | struct regmap *map, **m; |
b83a313b MB |
229 | int ret = -EINVAL; |
230 | ||
231 | if (!bus || !config) | |
abbb18fb | 232 | goto err; |
b83a313b MB |
233 | |
234 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
235 | if (map == NULL) { | |
236 | ret = -ENOMEM; | |
237 | goto err; | |
238 | } | |
239 | ||
bacdbe07 SW |
240 | if (bus->fast_io) { |
241 | spin_lock_init(&map->spinlock); | |
242 | map->lock = regmap_lock_spinlock; | |
243 | map->unlock = regmap_unlock_spinlock; | |
244 | } else { | |
245 | mutex_init(&map->mutex); | |
246 | map->lock = regmap_lock_mutex; | |
247 | map->unlock = regmap_unlock_mutex; | |
248 | } | |
c212accc | 249 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 250 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 251 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
5494a98f FE |
252 | map->format.buf_size = DIV_ROUND_UP(config->reg_bits + |
253 | config->val_bits + config->pad_bits, 8); | |
d939fb9a | 254 | map->reg_shift = config->pad_bits % 8; |
f01ee60f SW |
255 | if (config->reg_stride) |
256 | map->reg_stride = config->reg_stride; | |
257 | else | |
258 | map->reg_stride = 1; | |
2e33caf1 | 259 | map->use_single_rw = config->use_single_rw; |
b83a313b MB |
260 | map->dev = dev; |
261 | map->bus = bus; | |
0135bbcc | 262 | map->bus_context = bus_context; |
2e2ae66d MB |
263 | map->max_register = config->max_register; |
264 | map->writeable_reg = config->writeable_reg; | |
265 | map->readable_reg = config->readable_reg; | |
266 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 267 | map->precious_reg = config->precious_reg; |
5d1729e7 | 268 | map->cache_type = config->cache_type; |
72b39f6f | 269 | map->name = config->name; |
b83a313b | 270 | |
6f306441 LPC |
271 | if (config->read_flag_mask || config->write_flag_mask) { |
272 | map->read_flag_mask = config->read_flag_mask; | |
273 | map->write_flag_mask = config->write_flag_mask; | |
274 | } else { | |
275 | map->read_flag_mask = bus->read_flag_mask; | |
276 | } | |
277 | ||
d939fb9a | 278 | switch (config->reg_bits + map->reg_shift) { |
9aa50750 WS |
279 | case 2: |
280 | switch (config->val_bits) { | |
281 | case 6: | |
282 | map->format.format_write = regmap_format_2_6_write; | |
283 | break; | |
284 | default: | |
285 | goto err_map; | |
286 | } | |
287 | break; | |
288 | ||
b83a313b MB |
289 | case 4: |
290 | switch (config->val_bits) { | |
291 | case 12: | |
292 | map->format.format_write = regmap_format_4_12_write; | |
293 | break; | |
294 | default: | |
295 | goto err_map; | |
296 | } | |
297 | break; | |
298 | ||
299 | case 7: | |
300 | switch (config->val_bits) { | |
301 | case 9: | |
302 | map->format.format_write = regmap_format_7_9_write; | |
303 | break; | |
304 | default: | |
305 | goto err_map; | |
306 | } | |
307 | break; | |
308 | ||
7e5ec63e LPC |
309 | case 10: |
310 | switch (config->val_bits) { | |
311 | case 14: | |
312 | map->format.format_write = regmap_format_10_14_write; | |
313 | break; | |
314 | default: | |
315 | goto err_map; | |
316 | } | |
317 | break; | |
318 | ||
b83a313b MB |
319 | case 8: |
320 | map->format.format_reg = regmap_format_8; | |
321 | break; | |
322 | ||
323 | case 16: | |
324 | map->format.format_reg = regmap_format_16; | |
325 | break; | |
326 | ||
7d5e525b MB |
327 | case 32: |
328 | map->format.format_reg = regmap_format_32; | |
329 | break; | |
330 | ||
b83a313b MB |
331 | default: |
332 | goto err_map; | |
333 | } | |
334 | ||
335 | switch (config->val_bits) { | |
336 | case 8: | |
337 | map->format.format_val = regmap_format_8; | |
338 | map->format.parse_val = regmap_parse_8; | |
339 | break; | |
340 | case 16: | |
341 | map->format.format_val = regmap_format_16; | |
342 | map->format.parse_val = regmap_parse_16; | |
343 | break; | |
ea279fc5 MR |
344 | case 24: |
345 | map->format.format_val = regmap_format_24; | |
346 | map->format.parse_val = regmap_parse_24; | |
347 | break; | |
7d5e525b MB |
348 | case 32: |
349 | map->format.format_val = regmap_format_32; | |
350 | map->format.parse_val = regmap_parse_32; | |
351 | break; | |
b83a313b MB |
352 | } |
353 | ||
7a647614 MB |
354 | if (map->format.format_write) |
355 | map->use_single_rw = true; | |
356 | ||
b83a313b MB |
357 | if (!map->format.format_write && |
358 | !(map->format.format_reg && map->format.format_val)) | |
359 | goto err_map; | |
360 | ||
82159ba8 | 361 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
362 | if (map->work_buf == NULL) { |
363 | ret = -ENOMEM; | |
5204f5e3 | 364 | goto err_map; |
b83a313b MB |
365 | } |
366 | ||
d3c242e1 | 367 | regmap_debugfs_init(map, config->name); |
052d2cd1 | 368 | |
e5e3b8ab | 369 | ret = regcache_init(map, config); |
5d1729e7 | 370 | if (ret < 0) |
bfaa25f3 | 371 | goto err_debugfs; |
5d1729e7 | 372 | |
72b39f6f MB |
373 | /* Add a devres resource for dev_get_regmap() */ |
374 | m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL); | |
375 | if (!m) { | |
376 | ret = -ENOMEM; | |
377 | goto err_cache; | |
378 | } | |
379 | *m = map; | |
380 | devres_add(dev, m); | |
381 | ||
b83a313b MB |
382 | return map; |
383 | ||
72b39f6f MB |
384 | err_cache: |
385 | regcache_exit(map); | |
bfaa25f3 SW |
386 | err_debugfs: |
387 | regmap_debugfs_exit(map); | |
58072cbf | 388 | kfree(map->work_buf); |
b83a313b MB |
389 | err_map: |
390 | kfree(map); | |
391 | err: | |
392 | return ERR_PTR(ret); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(regmap_init); | |
395 | ||
c0eb4676 MB |
396 | static void devm_regmap_release(struct device *dev, void *res) |
397 | { | |
398 | regmap_exit(*(struct regmap **)res); | |
399 | } | |
400 | ||
401 | /** | |
402 | * devm_regmap_init(): Initialise managed register map | |
403 | * | |
404 | * @dev: Device that will be interacted with | |
405 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 406 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
407 | * @config: Configuration for register map |
408 | * | |
409 | * The return value will be an ERR_PTR() on error or a valid pointer | |
410 | * to a struct regmap. This function should generally not be called | |
411 | * directly, it should be called by bus-specific init functions. The | |
412 | * map will be automatically freed by the device management code. | |
413 | */ | |
414 | struct regmap *devm_regmap_init(struct device *dev, | |
415 | const struct regmap_bus *bus, | |
0135bbcc | 416 | void *bus_context, |
c0eb4676 MB |
417 | const struct regmap_config *config) |
418 | { | |
419 | struct regmap **ptr, *regmap; | |
420 | ||
421 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
422 | if (!ptr) | |
423 | return ERR_PTR(-ENOMEM); | |
424 | ||
0135bbcc | 425 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
426 | if (!IS_ERR(regmap)) { |
427 | *ptr = regmap; | |
428 | devres_add(dev, ptr); | |
429 | } else { | |
430 | devres_free(ptr); | |
431 | } | |
432 | ||
433 | return regmap; | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
436 | ||
bf315173 MB |
437 | /** |
438 | * regmap_reinit_cache(): Reinitialise the current register cache | |
439 | * | |
440 | * @map: Register map to operate on. | |
441 | * @config: New configuration. Only the cache data will be used. | |
442 | * | |
443 | * Discard any existing register cache for the map and initialize a | |
444 | * new cache. This can be used to restore the cache to defaults or to | |
445 | * update the cache configuration to reflect runtime discovery of the | |
446 | * hardware. | |
447 | */ | |
448 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
449 | { | |
450 | int ret; | |
451 | ||
bacdbe07 | 452 | map->lock(map); |
bf315173 MB |
453 | |
454 | regcache_exit(map); | |
a24f64a6 | 455 | regmap_debugfs_exit(map); |
bf315173 MB |
456 | |
457 | map->max_register = config->max_register; | |
458 | map->writeable_reg = config->writeable_reg; | |
459 | map->readable_reg = config->readable_reg; | |
460 | map->volatile_reg = config->volatile_reg; | |
461 | map->precious_reg = config->precious_reg; | |
462 | map->cache_type = config->cache_type; | |
463 | ||
d3c242e1 | 464 | regmap_debugfs_init(map, config->name); |
a24f64a6 | 465 | |
421e8d2d MB |
466 | map->cache_bypass = false; |
467 | map->cache_only = false; | |
468 | ||
bf315173 MB |
469 | ret = regcache_init(map, config); |
470 | ||
bacdbe07 | 471 | map->unlock(map); |
bf315173 MB |
472 | |
473 | return ret; | |
474 | } | |
752a6a5f | 475 | EXPORT_SYMBOL_GPL(regmap_reinit_cache); |
bf315173 | 476 | |
b83a313b MB |
477 | /** |
478 | * regmap_exit(): Free a previously allocated register map | |
479 | */ | |
480 | void regmap_exit(struct regmap *map) | |
481 | { | |
5d1729e7 | 482 | regcache_exit(map); |
31244e39 | 483 | regmap_debugfs_exit(map); |
0135bbcc SW |
484 | if (map->bus->free_context) |
485 | map->bus->free_context(map->bus_context); | |
b83a313b | 486 | kfree(map->work_buf); |
b83a313b MB |
487 | kfree(map); |
488 | } | |
489 | EXPORT_SYMBOL_GPL(regmap_exit); | |
490 | ||
72b39f6f MB |
491 | static int dev_get_regmap_match(struct device *dev, void *res, void *data) |
492 | { | |
493 | struct regmap **r = res; | |
494 | if (!r || !*r) { | |
495 | WARN_ON(!r || !*r); | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /* If the user didn't specify a name match any */ | |
500 | if (data) | |
501 | return (*r)->name == data; | |
502 | else | |
503 | return 1; | |
504 | } | |
505 | ||
506 | /** | |
507 | * dev_get_regmap(): Obtain the regmap (if any) for a device | |
508 | * | |
509 | * @dev: Device to retrieve the map for | |
510 | * @name: Optional name for the register map, usually NULL. | |
511 | * | |
512 | * Returns the regmap for the device if one is present, or NULL. If | |
513 | * name is specified then it must match the name specified when | |
514 | * registering the device, if it is NULL then the first regmap found | |
515 | * will be used. Devices with multiple register maps are very rare, | |
516 | * generic code should normally not need to specify a name. | |
517 | */ | |
518 | struct regmap *dev_get_regmap(struct device *dev, const char *name) | |
519 | { | |
520 | struct regmap **r = devres_find(dev, dev_get_regmap_release, | |
521 | dev_get_regmap_match, (void *)name); | |
522 | ||
523 | if (!r) | |
524 | return NULL; | |
525 | return *r; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(dev_get_regmap); | |
528 | ||
b83a313b MB |
529 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, |
530 | const void *val, size_t val_len) | |
531 | { | |
6f306441 | 532 | u8 *u8 = map->work_buf; |
b83a313b MB |
533 | void *buf; |
534 | int ret = -ENOTSUPP; | |
535 | size_t len; | |
73304781 MB |
536 | int i; |
537 | ||
538 | /* Check for unwritable registers before we start */ | |
539 | if (map->writeable_reg) | |
540 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
f01ee60f SW |
541 | if (!map->writeable_reg(map->dev, |
542 | reg + (i * map->reg_stride))) | |
73304781 | 543 | return -EINVAL; |
b83a313b | 544 | |
c9157198 LD |
545 | if (!map->cache_bypass && map->format.parse_val) { |
546 | unsigned int ival; | |
547 | int val_bytes = map->format.val_bytes; | |
548 | for (i = 0; i < val_len / val_bytes; i++) { | |
549 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
550 | ival = map->format.parse_val(map->work_buf); | |
f01ee60f SW |
551 | ret = regcache_write(map, reg + (i * map->reg_stride), |
552 | ival); | |
c9157198 LD |
553 | if (ret) { |
554 | dev_err(map->dev, | |
555 | "Error in caching of register: %u ret: %d\n", | |
556 | reg + i, ret); | |
557 | return ret; | |
558 | } | |
559 | } | |
560 | if (map->cache_only) { | |
561 | map->cache_dirty = true; | |
562 | return 0; | |
563 | } | |
564 | } | |
565 | ||
d939fb9a | 566 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b | 567 | |
6f306441 LPC |
568 | u8[0] |= map->write_flag_mask; |
569 | ||
fb2736bb MB |
570 | trace_regmap_hw_write_start(map->dev, reg, |
571 | val_len / map->format.val_bytes); | |
572 | ||
2547e201 MB |
573 | /* If we're doing a single register write we can probably just |
574 | * send the work_buf directly, otherwise try to do a gather | |
575 | * write. | |
576 | */ | |
82159ba8 MB |
577 | if (val == (map->work_buf + map->format.pad_bytes + |
578 | map->format.reg_bytes)) | |
0135bbcc | 579 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
580 | map->format.reg_bytes + |
581 | map->format.pad_bytes + | |
582 | val_len); | |
2547e201 | 583 | else if (map->bus->gather_write) |
0135bbcc | 584 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
585 | map->format.reg_bytes + |
586 | map->format.pad_bytes, | |
b83a313b MB |
587 | val, val_len); |
588 | ||
2547e201 | 589 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 590 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
591 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
592 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
593 | if (!buf) |
594 | return -ENOMEM; | |
595 | ||
596 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
597 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
598 | val, val_len); | |
0135bbcc | 599 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
600 | |
601 | kfree(buf); | |
602 | } | |
603 | ||
fb2736bb MB |
604 | trace_regmap_hw_write_done(map->dev, reg, |
605 | val_len / map->format.val_bytes); | |
606 | ||
b83a313b MB |
607 | return ret; |
608 | } | |
609 | ||
4d2dc095 DP |
610 | int _regmap_write(struct regmap *map, unsigned int reg, |
611 | unsigned int val) | |
b83a313b | 612 | { |
fb2736bb | 613 | int ret; |
b83a313b MB |
614 | BUG_ON(!map->format.format_write && !map->format.format_val); |
615 | ||
c9157198 | 616 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
617 | ret = regcache_write(map, reg, val); |
618 | if (ret != 0) | |
619 | return ret; | |
8ae0d7e8 MB |
620 | if (map->cache_only) { |
621 | map->cache_dirty = true; | |
5d1729e7 | 622 | return 0; |
8ae0d7e8 | 623 | } |
5d1729e7 DP |
624 | } |
625 | ||
fb2736bb MB |
626 | trace_regmap_reg_write(map->dev, reg, val); |
627 | ||
b83a313b MB |
628 | if (map->format.format_write) { |
629 | map->format.format_write(map, reg, val); | |
630 | ||
fb2736bb MB |
631 | trace_regmap_hw_write_start(map->dev, reg, 1); |
632 | ||
0135bbcc | 633 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
634 | map->format.buf_size); |
635 | ||
636 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
637 | ||
638 | return ret; | |
b83a313b | 639 | } else { |
82159ba8 | 640 | map->format.format_val(map->work_buf + map->format.reg_bytes |
d939fb9a | 641 | + map->format.pad_bytes, val, 0); |
b83a313b | 642 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
643 | map->work_buf + |
644 | map->format.reg_bytes + | |
645 | map->format.pad_bytes, | |
b83a313b MB |
646 | map->format.val_bytes); |
647 | } | |
648 | } | |
649 | ||
650 | /** | |
651 | * regmap_write(): Write a value to a single register | |
652 | * | |
653 | * @map: Register map to write to | |
654 | * @reg: Register to write to | |
655 | * @val: Value to be written | |
656 | * | |
657 | * A value of zero will be returned on success, a negative errno will | |
658 | * be returned in error cases. | |
659 | */ | |
660 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
661 | { | |
662 | int ret; | |
663 | ||
f01ee60f SW |
664 | if (reg % map->reg_stride) |
665 | return -EINVAL; | |
666 | ||
bacdbe07 | 667 | map->lock(map); |
b83a313b MB |
668 | |
669 | ret = _regmap_write(map, reg, val); | |
670 | ||
bacdbe07 | 671 | map->unlock(map); |
b83a313b MB |
672 | |
673 | return ret; | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(regmap_write); | |
676 | ||
677 | /** | |
678 | * regmap_raw_write(): Write raw values to one or more registers | |
679 | * | |
680 | * @map: Register map to write to | |
681 | * @reg: Initial register to write to | |
682 | * @val: Block of data to be written, laid out for direct transmission to the | |
683 | * device | |
684 | * @val_len: Length of data pointed to by val. | |
685 | * | |
686 | * This function is intended to be used for things like firmware | |
687 | * download where a large block of data needs to be transferred to the | |
688 | * device. No formatting will be done on the data provided. | |
689 | * | |
690 | * A value of zero will be returned on success, a negative errno will | |
691 | * be returned in error cases. | |
692 | */ | |
693 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
694 | const void *val, size_t val_len) | |
695 | { | |
696 | int ret; | |
697 | ||
851960ba SW |
698 | if (val_len % map->format.val_bytes) |
699 | return -EINVAL; | |
f01ee60f SW |
700 | if (reg % map->reg_stride) |
701 | return -EINVAL; | |
851960ba | 702 | |
bacdbe07 | 703 | map->lock(map); |
b83a313b MB |
704 | |
705 | ret = _regmap_raw_write(map, reg, val, val_len); | |
706 | ||
bacdbe07 | 707 | map->unlock(map); |
b83a313b MB |
708 | |
709 | return ret; | |
710 | } | |
711 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
712 | ||
8eaeb219 LD |
713 | /* |
714 | * regmap_bulk_write(): Write multiple registers to the device | |
715 | * | |
716 | * @map: Register map to write to | |
717 | * @reg: First register to be write from | |
718 | * @val: Block of data to be written, in native register size for device | |
719 | * @val_count: Number of registers to write | |
720 | * | |
721 | * This function is intended to be used for writing a large block of | |
722 | * data to be device either in single transfer or multiple transfer. | |
723 | * | |
724 | * A value of zero will be returned on success, a negative errno will | |
725 | * be returned in error cases. | |
726 | */ | |
727 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
728 | size_t val_count) | |
729 | { | |
730 | int ret = 0, i; | |
731 | size_t val_bytes = map->format.val_bytes; | |
732 | void *wval; | |
733 | ||
734 | if (!map->format.parse_val) | |
735 | return -EINVAL; | |
f01ee60f SW |
736 | if (reg % map->reg_stride) |
737 | return -EINVAL; | |
8eaeb219 | 738 | |
bacdbe07 | 739 | map->lock(map); |
8eaeb219 LD |
740 | |
741 | /* No formatting is require if val_byte is 1 */ | |
742 | if (val_bytes == 1) { | |
743 | wval = (void *)val; | |
744 | } else { | |
745 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
746 | if (!wval) { | |
747 | ret = -ENOMEM; | |
748 | dev_err(map->dev, "Error in memory allocation\n"); | |
749 | goto out; | |
750 | } | |
751 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
752 | map->format.parse_val(wval + i); | |
753 | } | |
2e33caf1 AJ |
754 | /* |
755 | * Some devices does not support bulk write, for | |
756 | * them we have a series of single write operations. | |
757 | */ | |
758 | if (map->use_single_rw) { | |
759 | for (i = 0; i < val_count; i++) { | |
760 | ret = regmap_raw_write(map, | |
761 | reg + (i * map->reg_stride), | |
762 | val + (i * val_bytes), | |
763 | val_bytes); | |
764 | if (ret != 0) | |
765 | return ret; | |
766 | } | |
767 | } else { | |
768 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
769 | } | |
8eaeb219 LD |
770 | |
771 | if (val_bytes != 1) | |
772 | kfree(wval); | |
773 | ||
774 | out: | |
bacdbe07 | 775 | map->unlock(map); |
8eaeb219 LD |
776 | return ret; |
777 | } | |
778 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
779 | ||
b83a313b MB |
780 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
781 | unsigned int val_len) | |
782 | { | |
783 | u8 *u8 = map->work_buf; | |
784 | int ret; | |
785 | ||
d939fb9a | 786 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b MB |
787 | |
788 | /* | |
6f306441 | 789 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
790 | * register addresss; since it's always the high bits for all |
791 | * current formats we can do this here rather than in | |
792 | * formatting. This may break if we get interesting formats. | |
793 | */ | |
6f306441 | 794 | u8[0] |= map->read_flag_mask; |
b83a313b | 795 | |
fb2736bb MB |
796 | trace_regmap_hw_read_start(map->dev, reg, |
797 | val_len / map->format.val_bytes); | |
798 | ||
0135bbcc | 799 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 800 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 801 | val, val_len); |
b83a313b | 802 | |
fb2736bb MB |
803 | trace_regmap_hw_read_done(map->dev, reg, |
804 | val_len / map->format.val_bytes); | |
805 | ||
806 | return ret; | |
b83a313b MB |
807 | } |
808 | ||
809 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
810 | unsigned int *val) | |
811 | { | |
812 | int ret; | |
813 | ||
5d1729e7 DP |
814 | if (!map->cache_bypass) { |
815 | ret = regcache_read(map, reg, val); | |
816 | if (ret == 0) | |
817 | return 0; | |
818 | } | |
819 | ||
19254411 LPC |
820 | if (!map->format.parse_val) |
821 | return -EINVAL; | |
822 | ||
5d1729e7 DP |
823 | if (map->cache_only) |
824 | return -EBUSY; | |
825 | ||
b83a313b | 826 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 827 | if (ret == 0) { |
b83a313b | 828 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
829 | trace_regmap_reg_read(map->dev, reg, *val); |
830 | } | |
b83a313b | 831 | |
f2985367 MB |
832 | if (ret == 0 && !map->cache_bypass) |
833 | regcache_write(map, reg, *val); | |
834 | ||
b83a313b MB |
835 | return ret; |
836 | } | |
837 | ||
838 | /** | |
839 | * regmap_read(): Read a value from a single register | |
840 | * | |
841 | * @map: Register map to write to | |
842 | * @reg: Register to be read from | |
843 | * @val: Pointer to store read value | |
844 | * | |
845 | * A value of zero will be returned on success, a negative errno will | |
846 | * be returned in error cases. | |
847 | */ | |
848 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
849 | { | |
850 | int ret; | |
851 | ||
f01ee60f SW |
852 | if (reg % map->reg_stride) |
853 | return -EINVAL; | |
854 | ||
bacdbe07 | 855 | map->lock(map); |
b83a313b MB |
856 | |
857 | ret = _regmap_read(map, reg, val); | |
858 | ||
bacdbe07 | 859 | map->unlock(map); |
b83a313b MB |
860 | |
861 | return ret; | |
862 | } | |
863 | EXPORT_SYMBOL_GPL(regmap_read); | |
864 | ||
865 | /** | |
866 | * regmap_raw_read(): Read raw data from the device | |
867 | * | |
868 | * @map: Register map to write to | |
869 | * @reg: First register to be read from | |
870 | * @val: Pointer to store read value | |
871 | * @val_len: Size of data to read | |
872 | * | |
873 | * A value of zero will be returned on success, a negative errno will | |
874 | * be returned in error cases. | |
875 | */ | |
876 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
877 | size_t val_len) | |
878 | { | |
b8fb5ab1 MB |
879 | size_t val_bytes = map->format.val_bytes; |
880 | size_t val_count = val_len / val_bytes; | |
881 | unsigned int v; | |
882 | int ret, i; | |
04e016ad | 883 | |
851960ba SW |
884 | if (val_len % map->format.val_bytes) |
885 | return -EINVAL; | |
f01ee60f SW |
886 | if (reg % map->reg_stride) |
887 | return -EINVAL; | |
851960ba | 888 | |
bacdbe07 | 889 | map->lock(map); |
b83a313b | 890 | |
b8fb5ab1 MB |
891 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
892 | map->cache_type == REGCACHE_NONE) { | |
893 | /* Physical block read if there's no cache involved */ | |
894 | ret = _regmap_raw_read(map, reg, val, val_len); | |
895 | ||
896 | } else { | |
897 | /* Otherwise go word by word for the cache; should be low | |
898 | * cost as we expect to hit the cache. | |
899 | */ | |
900 | for (i = 0; i < val_count; i++) { | |
f01ee60f SW |
901 | ret = _regmap_read(map, reg + (i * map->reg_stride), |
902 | &v); | |
b8fb5ab1 MB |
903 | if (ret != 0) |
904 | goto out; | |
905 | ||
d939fb9a | 906 | map->format.format_val(val + (i * val_bytes), v, 0); |
b8fb5ab1 MB |
907 | } |
908 | } | |
b83a313b | 909 | |
b8fb5ab1 | 910 | out: |
bacdbe07 | 911 | map->unlock(map); |
b83a313b MB |
912 | |
913 | return ret; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
916 | ||
917 | /** | |
918 | * regmap_bulk_read(): Read multiple registers from the device | |
919 | * | |
920 | * @map: Register map to write to | |
921 | * @reg: First register to be read from | |
922 | * @val: Pointer to store read value, in native register size for device | |
923 | * @val_count: Number of registers to read | |
924 | * | |
925 | * A value of zero will be returned on success, a negative errno will | |
926 | * be returned in error cases. | |
927 | */ | |
928 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
929 | size_t val_count) | |
930 | { | |
931 | int ret, i; | |
932 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 933 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 934 | |
b83a313b MB |
935 | if (!map->format.parse_val) |
936 | return -EINVAL; | |
f01ee60f SW |
937 | if (reg % map->reg_stride) |
938 | return -EINVAL; | |
b83a313b | 939 | |
de2d808f | 940 | if (vol || map->cache_type == REGCACHE_NONE) { |
2e33caf1 AJ |
941 | /* |
942 | * Some devices does not support bulk read, for | |
943 | * them we have a series of single read operations. | |
944 | */ | |
945 | if (map->use_single_rw) { | |
946 | for (i = 0; i < val_count; i++) { | |
947 | ret = regmap_raw_read(map, | |
948 | reg + (i * map->reg_stride), | |
949 | val + (i * val_bytes), | |
950 | val_bytes); | |
951 | if (ret != 0) | |
952 | return ret; | |
953 | } | |
954 | } else { | |
955 | ret = regmap_raw_read(map, reg, val, | |
956 | val_bytes * val_count); | |
957 | if (ret != 0) | |
958 | return ret; | |
959 | } | |
de2d808f MB |
960 | |
961 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
962 | map->format.parse_val(val + i); | |
963 | } else { | |
964 | for (i = 0; i < val_count; i++) { | |
6560ffd1 | 965 | unsigned int ival; |
f01ee60f | 966 | ret = regmap_read(map, reg + (i * map->reg_stride), |
25061d28 | 967 | &ival); |
de2d808f MB |
968 | if (ret != 0) |
969 | return ret; | |
6560ffd1 | 970 | memcpy(val + (i * val_bytes), &ival, val_bytes); |
de2d808f MB |
971 | } |
972 | } | |
b83a313b MB |
973 | |
974 | return 0; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
977 | ||
018690d3 MB |
978 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
979 | unsigned int mask, unsigned int val, | |
980 | bool *change) | |
b83a313b MB |
981 | { |
982 | int ret; | |
d91e8db2 | 983 | unsigned int tmp, orig; |
b83a313b | 984 | |
bacdbe07 | 985 | map->lock(map); |
b83a313b | 986 | |
d91e8db2 | 987 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
988 | if (ret != 0) |
989 | goto out; | |
990 | ||
d91e8db2 | 991 | tmp = orig & ~mask; |
b83a313b MB |
992 | tmp |= val & mask; |
993 | ||
018690d3 | 994 | if (tmp != orig) { |
d91e8db2 | 995 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
996 | *change = true; |
997 | } else { | |
998 | *change = false; | |
999 | } | |
b83a313b MB |
1000 | |
1001 | out: | |
bacdbe07 | 1002 | map->unlock(map); |
b83a313b MB |
1003 | |
1004 | return ret; | |
1005 | } | |
018690d3 MB |
1006 | |
1007 | /** | |
1008 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
1009 | * | |
1010 | * @map: Register map to update | |
1011 | * @reg: Register to update | |
1012 | * @mask: Bitmask to change | |
1013 | * @val: New value for bitmask | |
1014 | * | |
1015 | * Returns zero for success, a negative number on error. | |
1016 | */ | |
1017 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
1018 | unsigned int mask, unsigned int val) | |
1019 | { | |
1020 | bool change; | |
1021 | return _regmap_update_bits(map, reg, mask, val, &change); | |
1022 | } | |
b83a313b | 1023 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 1024 | |
018690d3 MB |
1025 | /** |
1026 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
1027 | * register map and report if updated | |
1028 | * | |
1029 | * @map: Register map to update | |
1030 | * @reg: Register to update | |
1031 | * @mask: Bitmask to change | |
1032 | * @val: New value for bitmask | |
1033 | * @change: Boolean indicating if a write was done | |
1034 | * | |
1035 | * Returns zero for success, a negative number on error. | |
1036 | */ | |
1037 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
1038 | unsigned int mask, unsigned int val, | |
1039 | bool *change) | |
1040 | { | |
1041 | return _regmap_update_bits(map, reg, mask, val, change); | |
1042 | } | |
1043 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
1044 | ||
22f0d90a MB |
1045 | /** |
1046 | * regmap_register_patch: Register and apply register updates to be applied | |
1047 | * on device initialistion | |
1048 | * | |
1049 | * @map: Register map to apply updates to. | |
1050 | * @regs: Values to update. | |
1051 | * @num_regs: Number of entries in regs. | |
1052 | * | |
1053 | * Register a set of register updates to be applied to the device | |
1054 | * whenever the device registers are synchronised with the cache and | |
1055 | * apply them immediately. Typically this is used to apply | |
1056 | * corrections to be applied to the device defaults on startup, such | |
1057 | * as the updates some vendors provide to undocumented registers. | |
1058 | */ | |
1059 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
1060 | int num_regs) | |
1061 | { | |
1062 | int i, ret; | |
1063 | bool bypass; | |
1064 | ||
1065 | /* If needed the implementation can be extended to support this */ | |
1066 | if (map->patch) | |
1067 | return -EBUSY; | |
1068 | ||
bacdbe07 | 1069 | map->lock(map); |
22f0d90a MB |
1070 | |
1071 | bypass = map->cache_bypass; | |
1072 | ||
1073 | map->cache_bypass = true; | |
1074 | ||
1075 | /* Write out first; it's useful to apply even if we fail later. */ | |
1076 | for (i = 0; i < num_regs; i++) { | |
1077 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
1078 | if (ret != 0) { | |
1079 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
1080 | regs[i].reg, regs[i].def, ret); | |
1081 | goto out; | |
1082 | } | |
1083 | } | |
1084 | ||
2a14d7d9 | 1085 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
1086 | if (map->patch != NULL) { |
1087 | memcpy(map->patch, regs, | |
1088 | num_regs * sizeof(struct reg_default)); | |
1089 | map->patch_regs = num_regs; | |
1090 | } else { | |
1091 | ret = -ENOMEM; | |
1092 | } | |
1093 | ||
1094 | out: | |
1095 | map->cache_bypass = bypass; | |
1096 | ||
bacdbe07 | 1097 | map->unlock(map); |
22f0d90a MB |
1098 | |
1099 | return ret; | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
1102 | ||
eae4b51b | 1103 | /* |
a6539c32 MB |
1104 | * regmap_get_val_bytes(): Report the size of a register value |
1105 | * | |
1106 | * Report the size of a register value, mainly intended to for use by | |
1107 | * generic infrastructure built on top of regmap. | |
1108 | */ | |
1109 | int regmap_get_val_bytes(struct regmap *map) | |
1110 | { | |
1111 | if (map->format.format_write) | |
1112 | return -EINVAL; | |
1113 | ||
1114 | return map->format.val_bytes; | |
1115 | } | |
1116 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
1117 | ||
31244e39 MB |
1118 | static int __init regmap_initcall(void) |
1119 | { | |
1120 | regmap_debugfs_initcall(); | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | postcore_initcall(regmap_initcall); |