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> | |
6863ca62 | 18 | #include <linux/rbtree.h> |
b83a313b | 19 | |
fb2736bb MB |
20 | #define CREATE_TRACE_POINTS |
21 | #include <trace/events/regmap.h> | |
22 | ||
93de9124 | 23 | #include "internal.h" |
b83a313b | 24 | |
1044c180 MB |
25 | /* |
26 | * Sometimes for failures during very early init the trace | |
27 | * infrastructure isn't available early enough to be used. For this | |
28 | * sort of problem defining LOG_DEVICE will add printks for basic | |
29 | * register I/O on a specific device. | |
30 | */ | |
31 | #undef LOG_DEVICE | |
32 | ||
33 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, | |
34 | unsigned int mask, unsigned int val, | |
35 | bool *change); | |
36 | ||
8de2f081 MB |
37 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
38 | { | |
39 | if (map->max_register && reg > map->max_register) | |
40 | return false; | |
41 | ||
42 | if (map->writeable_reg) | |
43 | return map->writeable_reg(map->dev, reg); | |
44 | ||
45 | return true; | |
46 | } | |
47 | ||
48 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
49 | { | |
50 | if (map->max_register && reg > map->max_register) | |
51 | return false; | |
52 | ||
4191f197 WS |
53 | if (map->format.format_write) |
54 | return false; | |
55 | ||
8de2f081 MB |
56 | if (map->readable_reg) |
57 | return map->readable_reg(map->dev, reg); | |
58 | ||
59 | return true; | |
60 | } | |
61 | ||
62 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
63 | { | |
4191f197 | 64 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
65 | return false; |
66 | ||
67 | if (map->volatile_reg) | |
68 | return map->volatile_reg(map->dev, reg); | |
69 | ||
70 | return true; | |
71 | } | |
72 | ||
73 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
74 | { | |
4191f197 | 75 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
76 | return false; |
77 | ||
78 | if (map->precious_reg) | |
79 | return map->precious_reg(map->dev, reg); | |
80 | ||
81 | return false; | |
82 | } | |
83 | ||
82cd9965 LPC |
84 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
85 | unsigned int num) | |
86 | { | |
87 | unsigned int i; | |
88 | ||
89 | for (i = 0; i < num; i++) | |
90 | if (!regmap_volatile(map, reg + i)) | |
91 | return false; | |
92 | ||
93 | return true; | |
94 | } | |
95 | ||
9aa50750 WS |
96 | static void regmap_format_2_6_write(struct regmap *map, |
97 | unsigned int reg, unsigned int val) | |
98 | { | |
99 | u8 *out = map->work_buf; | |
100 | ||
101 | *out = (reg << 6) | val; | |
102 | } | |
103 | ||
b83a313b MB |
104 | static void regmap_format_4_12_write(struct regmap *map, |
105 | unsigned int reg, unsigned int val) | |
106 | { | |
107 | __be16 *out = map->work_buf; | |
108 | *out = cpu_to_be16((reg << 12) | val); | |
109 | } | |
110 | ||
111 | static void regmap_format_7_9_write(struct regmap *map, | |
112 | unsigned int reg, unsigned int val) | |
113 | { | |
114 | __be16 *out = map->work_buf; | |
115 | *out = cpu_to_be16((reg << 9) | val); | |
116 | } | |
117 | ||
7e5ec63e LPC |
118 | static void regmap_format_10_14_write(struct regmap *map, |
119 | unsigned int reg, unsigned int val) | |
120 | { | |
121 | u8 *out = map->work_buf; | |
122 | ||
123 | out[2] = val; | |
124 | out[1] = (val >> 8) | (reg << 6); | |
125 | out[0] = reg >> 2; | |
126 | } | |
127 | ||
d939fb9a | 128 | static void regmap_format_8(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
129 | { |
130 | u8 *b = buf; | |
131 | ||
d939fb9a | 132 | b[0] = val << shift; |
b83a313b MB |
133 | } |
134 | ||
141eba2e | 135 | static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
136 | { |
137 | __be16 *b = buf; | |
138 | ||
d939fb9a | 139 | b[0] = cpu_to_be16(val << shift); |
b83a313b MB |
140 | } |
141 | ||
141eba2e SW |
142 | static void regmap_format_16_native(void *buf, unsigned int val, |
143 | unsigned int shift) | |
144 | { | |
145 | *(u16 *)buf = val << shift; | |
146 | } | |
147 | ||
d939fb9a | 148 | static void regmap_format_24(void *buf, unsigned int val, unsigned int shift) |
ea279fc5 MR |
149 | { |
150 | u8 *b = buf; | |
151 | ||
d939fb9a MR |
152 | val <<= shift; |
153 | ||
ea279fc5 MR |
154 | b[0] = val >> 16; |
155 | b[1] = val >> 8; | |
156 | b[2] = val; | |
157 | } | |
158 | ||
141eba2e | 159 | static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift) |
7d5e525b MB |
160 | { |
161 | __be32 *b = buf; | |
162 | ||
d939fb9a | 163 | b[0] = cpu_to_be32(val << shift); |
7d5e525b MB |
164 | } |
165 | ||
141eba2e SW |
166 | static void regmap_format_32_native(void *buf, unsigned int val, |
167 | unsigned int shift) | |
168 | { | |
169 | *(u32 *)buf = val << shift; | |
170 | } | |
171 | ||
b83a313b MB |
172 | static unsigned int regmap_parse_8(void *buf) |
173 | { | |
174 | u8 *b = buf; | |
175 | ||
176 | return b[0]; | |
177 | } | |
178 | ||
141eba2e | 179 | static unsigned int regmap_parse_16_be(void *buf) |
b83a313b MB |
180 | { |
181 | __be16 *b = buf; | |
182 | ||
183 | b[0] = be16_to_cpu(b[0]); | |
184 | ||
185 | return b[0]; | |
186 | } | |
187 | ||
141eba2e SW |
188 | static unsigned int regmap_parse_16_native(void *buf) |
189 | { | |
190 | return *(u16 *)buf; | |
191 | } | |
192 | ||
ea279fc5 MR |
193 | static unsigned int regmap_parse_24(void *buf) |
194 | { | |
195 | u8 *b = buf; | |
196 | unsigned int ret = b[2]; | |
197 | ret |= ((unsigned int)b[1]) << 8; | |
198 | ret |= ((unsigned int)b[0]) << 16; | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
141eba2e | 203 | static unsigned int regmap_parse_32_be(void *buf) |
7d5e525b MB |
204 | { |
205 | __be32 *b = buf; | |
206 | ||
207 | b[0] = be32_to_cpu(b[0]); | |
208 | ||
209 | return b[0]; | |
210 | } | |
211 | ||
141eba2e SW |
212 | static unsigned int regmap_parse_32_native(void *buf) |
213 | { | |
214 | return *(u32 *)buf; | |
215 | } | |
216 | ||
0d4529c5 | 217 | static void regmap_lock_mutex(void *__map) |
bacdbe07 | 218 | { |
0d4529c5 | 219 | struct regmap *map = __map; |
bacdbe07 SW |
220 | mutex_lock(&map->mutex); |
221 | } | |
222 | ||
0d4529c5 | 223 | static void regmap_unlock_mutex(void *__map) |
bacdbe07 | 224 | { |
0d4529c5 | 225 | struct regmap *map = __map; |
bacdbe07 SW |
226 | mutex_unlock(&map->mutex); |
227 | } | |
228 | ||
0d4529c5 | 229 | static void regmap_lock_spinlock(void *__map) |
bacdbe07 | 230 | { |
0d4529c5 | 231 | struct regmap *map = __map; |
bacdbe07 SW |
232 | spin_lock(&map->spinlock); |
233 | } | |
234 | ||
0d4529c5 | 235 | static void regmap_unlock_spinlock(void *__map) |
bacdbe07 | 236 | { |
0d4529c5 | 237 | struct regmap *map = __map; |
bacdbe07 SW |
238 | spin_unlock(&map->spinlock); |
239 | } | |
240 | ||
72b39f6f MB |
241 | static void dev_get_regmap_release(struct device *dev, void *res) |
242 | { | |
243 | /* | |
244 | * We don't actually have anything to do here; the goal here | |
245 | * is not to manage the regmap but to provide a simple way to | |
246 | * get the regmap back given a struct device. | |
247 | */ | |
248 | } | |
249 | ||
6863ca62 KG |
250 | static bool _regmap_range_add(struct regmap *map, |
251 | struct regmap_range_node *data) | |
252 | { | |
253 | struct rb_root *root = &map->range_tree; | |
254 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
255 | ||
256 | while (*new) { | |
257 | struct regmap_range_node *this = | |
258 | container_of(*new, struct regmap_range_node, node); | |
259 | ||
260 | parent = *new; | |
261 | if (data->range_max < this->range_min) | |
262 | new = &((*new)->rb_left); | |
263 | else if (data->range_min > this->range_max) | |
264 | new = &((*new)->rb_right); | |
265 | else | |
266 | return false; | |
267 | } | |
268 | ||
269 | rb_link_node(&data->node, parent, new); | |
270 | rb_insert_color(&data->node, root); | |
271 | ||
272 | return true; | |
273 | } | |
274 | ||
275 | static struct regmap_range_node *_regmap_range_lookup(struct regmap *map, | |
276 | unsigned int reg) | |
277 | { | |
278 | struct rb_node *node = map->range_tree.rb_node; | |
279 | ||
280 | while (node) { | |
281 | struct regmap_range_node *this = | |
282 | container_of(node, struct regmap_range_node, node); | |
283 | ||
284 | if (reg < this->range_min) | |
285 | node = node->rb_left; | |
286 | else if (reg > this->range_max) | |
287 | node = node->rb_right; | |
288 | else | |
289 | return this; | |
290 | } | |
291 | ||
292 | return NULL; | |
293 | } | |
294 | ||
295 | static void regmap_range_exit(struct regmap *map) | |
296 | { | |
297 | struct rb_node *next; | |
298 | struct regmap_range_node *range_node; | |
299 | ||
300 | next = rb_first(&map->range_tree); | |
301 | while (next) { | |
302 | range_node = rb_entry(next, struct regmap_range_node, node); | |
303 | next = rb_next(&range_node->node); | |
304 | rb_erase(&range_node->node, &map->range_tree); | |
305 | kfree(range_node); | |
306 | } | |
307 | ||
308 | kfree(map->selector_work_buf); | |
309 | } | |
310 | ||
b83a313b MB |
311 | /** |
312 | * regmap_init(): Initialise register map | |
313 | * | |
314 | * @dev: Device that will be interacted with | |
315 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 316 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
317 | * @config: Configuration for register map |
318 | * | |
319 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
320 | * a struct regmap. This function should generally not be called | |
321 | * directly, it should be called by bus-specific init functions. | |
322 | */ | |
323 | struct regmap *regmap_init(struct device *dev, | |
324 | const struct regmap_bus *bus, | |
0135bbcc | 325 | void *bus_context, |
b83a313b MB |
326 | const struct regmap_config *config) |
327 | { | |
72b39f6f | 328 | struct regmap *map, **m; |
b83a313b | 329 | int ret = -EINVAL; |
141eba2e | 330 | enum regmap_endian reg_endian, val_endian; |
6863ca62 | 331 | int i, j; |
b83a313b MB |
332 | |
333 | if (!bus || !config) | |
abbb18fb | 334 | goto err; |
b83a313b MB |
335 | |
336 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
337 | if (map == NULL) { | |
338 | ret = -ENOMEM; | |
339 | goto err; | |
340 | } | |
341 | ||
0d4529c5 DC |
342 | if (config->lock && config->unlock) { |
343 | map->lock = config->lock; | |
344 | map->unlock = config->unlock; | |
345 | map->lock_arg = config->lock_arg; | |
bacdbe07 | 346 | } else { |
0d4529c5 DC |
347 | if (bus->fast_io) { |
348 | spin_lock_init(&map->spinlock); | |
349 | map->lock = regmap_lock_spinlock; | |
350 | map->unlock = regmap_unlock_spinlock; | |
351 | } else { | |
352 | mutex_init(&map->mutex); | |
353 | map->lock = regmap_lock_mutex; | |
354 | map->unlock = regmap_unlock_mutex; | |
355 | } | |
356 | map->lock_arg = map; | |
bacdbe07 | 357 | } |
c212accc | 358 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 359 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 360 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
5494a98f FE |
361 | map->format.buf_size = DIV_ROUND_UP(config->reg_bits + |
362 | config->val_bits + config->pad_bits, 8); | |
d939fb9a | 363 | map->reg_shift = config->pad_bits % 8; |
f01ee60f SW |
364 | if (config->reg_stride) |
365 | map->reg_stride = config->reg_stride; | |
366 | else | |
367 | map->reg_stride = 1; | |
2e33caf1 | 368 | map->use_single_rw = config->use_single_rw; |
b83a313b MB |
369 | map->dev = dev; |
370 | map->bus = bus; | |
0135bbcc | 371 | map->bus_context = bus_context; |
2e2ae66d MB |
372 | map->max_register = config->max_register; |
373 | map->writeable_reg = config->writeable_reg; | |
374 | map->readable_reg = config->readable_reg; | |
375 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 376 | map->precious_reg = config->precious_reg; |
5d1729e7 | 377 | map->cache_type = config->cache_type; |
72b39f6f | 378 | map->name = config->name; |
b83a313b | 379 | |
6f306441 LPC |
380 | if (config->read_flag_mask || config->write_flag_mask) { |
381 | map->read_flag_mask = config->read_flag_mask; | |
382 | map->write_flag_mask = config->write_flag_mask; | |
383 | } else { | |
384 | map->read_flag_mask = bus->read_flag_mask; | |
385 | } | |
386 | ||
141eba2e SW |
387 | reg_endian = config->reg_format_endian; |
388 | if (reg_endian == REGMAP_ENDIAN_DEFAULT) | |
389 | reg_endian = bus->reg_format_endian_default; | |
390 | if (reg_endian == REGMAP_ENDIAN_DEFAULT) | |
391 | reg_endian = REGMAP_ENDIAN_BIG; | |
392 | ||
393 | val_endian = config->val_format_endian; | |
394 | if (val_endian == REGMAP_ENDIAN_DEFAULT) | |
395 | val_endian = bus->val_format_endian_default; | |
396 | if (val_endian == REGMAP_ENDIAN_DEFAULT) | |
397 | val_endian = REGMAP_ENDIAN_BIG; | |
398 | ||
d939fb9a | 399 | switch (config->reg_bits + map->reg_shift) { |
9aa50750 WS |
400 | case 2: |
401 | switch (config->val_bits) { | |
402 | case 6: | |
403 | map->format.format_write = regmap_format_2_6_write; | |
404 | break; | |
405 | default: | |
406 | goto err_map; | |
407 | } | |
408 | break; | |
409 | ||
b83a313b MB |
410 | case 4: |
411 | switch (config->val_bits) { | |
412 | case 12: | |
413 | map->format.format_write = regmap_format_4_12_write; | |
414 | break; | |
415 | default: | |
416 | goto err_map; | |
417 | } | |
418 | break; | |
419 | ||
420 | case 7: | |
421 | switch (config->val_bits) { | |
422 | case 9: | |
423 | map->format.format_write = regmap_format_7_9_write; | |
424 | break; | |
425 | default: | |
426 | goto err_map; | |
427 | } | |
428 | break; | |
429 | ||
7e5ec63e LPC |
430 | case 10: |
431 | switch (config->val_bits) { | |
432 | case 14: | |
433 | map->format.format_write = regmap_format_10_14_write; | |
434 | break; | |
435 | default: | |
436 | goto err_map; | |
437 | } | |
438 | break; | |
439 | ||
b83a313b MB |
440 | case 8: |
441 | map->format.format_reg = regmap_format_8; | |
442 | break; | |
443 | ||
444 | case 16: | |
141eba2e SW |
445 | switch (reg_endian) { |
446 | case REGMAP_ENDIAN_BIG: | |
447 | map->format.format_reg = regmap_format_16_be; | |
448 | break; | |
449 | case REGMAP_ENDIAN_NATIVE: | |
450 | map->format.format_reg = regmap_format_16_native; | |
451 | break; | |
452 | default: | |
453 | goto err_map; | |
454 | } | |
b83a313b MB |
455 | break; |
456 | ||
7d5e525b | 457 | case 32: |
141eba2e SW |
458 | switch (reg_endian) { |
459 | case REGMAP_ENDIAN_BIG: | |
460 | map->format.format_reg = regmap_format_32_be; | |
461 | break; | |
462 | case REGMAP_ENDIAN_NATIVE: | |
463 | map->format.format_reg = regmap_format_32_native; | |
464 | break; | |
465 | default: | |
466 | goto err_map; | |
467 | } | |
7d5e525b MB |
468 | break; |
469 | ||
b83a313b MB |
470 | default: |
471 | goto err_map; | |
472 | } | |
473 | ||
474 | switch (config->val_bits) { | |
475 | case 8: | |
476 | map->format.format_val = regmap_format_8; | |
477 | map->format.parse_val = regmap_parse_8; | |
478 | break; | |
479 | case 16: | |
141eba2e SW |
480 | switch (val_endian) { |
481 | case REGMAP_ENDIAN_BIG: | |
482 | map->format.format_val = regmap_format_16_be; | |
483 | map->format.parse_val = regmap_parse_16_be; | |
484 | break; | |
485 | case REGMAP_ENDIAN_NATIVE: | |
486 | map->format.format_val = regmap_format_16_native; | |
487 | map->format.parse_val = regmap_parse_16_native; | |
488 | break; | |
489 | default: | |
490 | goto err_map; | |
491 | } | |
b83a313b | 492 | break; |
ea279fc5 | 493 | case 24: |
141eba2e SW |
494 | if (val_endian != REGMAP_ENDIAN_BIG) |
495 | goto err_map; | |
ea279fc5 MR |
496 | map->format.format_val = regmap_format_24; |
497 | map->format.parse_val = regmap_parse_24; | |
498 | break; | |
7d5e525b | 499 | case 32: |
141eba2e SW |
500 | switch (val_endian) { |
501 | case REGMAP_ENDIAN_BIG: | |
502 | map->format.format_val = regmap_format_32_be; | |
503 | map->format.parse_val = regmap_parse_32_be; | |
504 | break; | |
505 | case REGMAP_ENDIAN_NATIVE: | |
506 | map->format.format_val = regmap_format_32_native; | |
507 | map->format.parse_val = regmap_parse_32_native; | |
508 | break; | |
509 | default: | |
510 | goto err_map; | |
511 | } | |
7d5e525b | 512 | break; |
b83a313b MB |
513 | } |
514 | ||
141eba2e SW |
515 | if (map->format.format_write) { |
516 | if ((reg_endian != REGMAP_ENDIAN_BIG) || | |
517 | (val_endian != REGMAP_ENDIAN_BIG)) | |
518 | goto err_map; | |
7a647614 | 519 | map->use_single_rw = true; |
141eba2e | 520 | } |
7a647614 | 521 | |
b83a313b MB |
522 | if (!map->format.format_write && |
523 | !(map->format.format_reg && map->format.format_val)) | |
524 | goto err_map; | |
525 | ||
82159ba8 | 526 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
527 | if (map->work_buf == NULL) { |
528 | ret = -ENOMEM; | |
5204f5e3 | 529 | goto err_map; |
b83a313b MB |
530 | } |
531 | ||
6863ca62 KG |
532 | map->range_tree = RB_ROOT; |
533 | for (i = 0; i < config->n_ranges; i++) { | |
534 | const struct regmap_range_cfg *range_cfg = &config->ranges[i]; | |
535 | struct regmap_range_node *new; | |
536 | ||
537 | /* Sanity check */ | |
538 | if (range_cfg->range_max < range_cfg->range_min || | |
539 | range_cfg->range_max > map->max_register || | |
540 | range_cfg->selector_reg > map->max_register || | |
541 | range_cfg->window_len == 0) | |
542 | goto err_range; | |
543 | ||
544 | /* Make sure, that this register range has no selector | |
545 | or data window within its boundary */ | |
546 | for (j = 0; j < config->n_ranges; j++) { | |
547 | unsigned sel_reg = config->ranges[j].selector_reg; | |
548 | unsigned win_min = config->ranges[j].window_start; | |
549 | unsigned win_max = win_min + | |
550 | config->ranges[j].window_len - 1; | |
551 | ||
552 | if (range_cfg->range_min <= sel_reg && | |
553 | sel_reg <= range_cfg->range_max) { | |
554 | goto err_range; | |
555 | } | |
556 | ||
557 | if (!(win_max < range_cfg->range_min || | |
558 | win_min > range_cfg->range_max)) { | |
559 | goto err_range; | |
560 | } | |
561 | } | |
562 | ||
563 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
564 | if (new == NULL) { | |
565 | ret = -ENOMEM; | |
566 | goto err_range; | |
567 | } | |
568 | ||
569 | new->range_min = range_cfg->range_min; | |
570 | new->range_max = range_cfg->range_max; | |
571 | new->selector_reg = range_cfg->selector_reg; | |
572 | new->selector_mask = range_cfg->selector_mask; | |
573 | new->selector_shift = range_cfg->selector_shift; | |
574 | new->window_start = range_cfg->window_start; | |
575 | new->window_len = range_cfg->window_len; | |
576 | ||
577 | if (_regmap_range_add(map, new) == false) { | |
578 | kfree(new); | |
579 | goto err_range; | |
580 | } | |
581 | ||
582 | if (map->selector_work_buf == NULL) { | |
583 | map->selector_work_buf = | |
584 | kzalloc(map->format.buf_size, GFP_KERNEL); | |
585 | if (map->selector_work_buf == NULL) { | |
586 | ret = -ENOMEM; | |
587 | goto err_range; | |
588 | } | |
589 | } | |
590 | } | |
052d2cd1 | 591 | |
e5e3b8ab | 592 | ret = regcache_init(map, config); |
5d1729e7 | 593 | if (ret < 0) |
6863ca62 KG |
594 | goto err_range; |
595 | ||
596 | regmap_debugfs_init(map, config->name); | |
5d1729e7 | 597 | |
72b39f6f MB |
598 | /* Add a devres resource for dev_get_regmap() */ |
599 | m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL); | |
600 | if (!m) { | |
601 | ret = -ENOMEM; | |
6863ca62 | 602 | goto err_debugfs; |
72b39f6f MB |
603 | } |
604 | *m = map; | |
605 | devres_add(dev, m); | |
606 | ||
b83a313b MB |
607 | return map; |
608 | ||
bfaa25f3 SW |
609 | err_debugfs: |
610 | regmap_debugfs_exit(map); | |
72b39f6f | 611 | regcache_exit(map); |
6863ca62 KG |
612 | err_range: |
613 | regmap_range_exit(map); | |
58072cbf | 614 | kfree(map->work_buf); |
b83a313b MB |
615 | err_map: |
616 | kfree(map); | |
617 | err: | |
618 | return ERR_PTR(ret); | |
619 | } | |
620 | EXPORT_SYMBOL_GPL(regmap_init); | |
621 | ||
c0eb4676 MB |
622 | static void devm_regmap_release(struct device *dev, void *res) |
623 | { | |
624 | regmap_exit(*(struct regmap **)res); | |
625 | } | |
626 | ||
627 | /** | |
628 | * devm_regmap_init(): Initialise managed register map | |
629 | * | |
630 | * @dev: Device that will be interacted with | |
631 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 632 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
633 | * @config: Configuration for register map |
634 | * | |
635 | * The return value will be an ERR_PTR() on error or a valid pointer | |
636 | * to a struct regmap. This function should generally not be called | |
637 | * directly, it should be called by bus-specific init functions. The | |
638 | * map will be automatically freed by the device management code. | |
639 | */ | |
640 | struct regmap *devm_regmap_init(struct device *dev, | |
641 | const struct regmap_bus *bus, | |
0135bbcc | 642 | void *bus_context, |
c0eb4676 MB |
643 | const struct regmap_config *config) |
644 | { | |
645 | struct regmap **ptr, *regmap; | |
646 | ||
647 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
648 | if (!ptr) | |
649 | return ERR_PTR(-ENOMEM); | |
650 | ||
0135bbcc | 651 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
652 | if (!IS_ERR(regmap)) { |
653 | *ptr = regmap; | |
654 | devres_add(dev, ptr); | |
655 | } else { | |
656 | devres_free(ptr); | |
657 | } | |
658 | ||
659 | return regmap; | |
660 | } | |
661 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
662 | ||
bf315173 MB |
663 | /** |
664 | * regmap_reinit_cache(): Reinitialise the current register cache | |
665 | * | |
666 | * @map: Register map to operate on. | |
667 | * @config: New configuration. Only the cache data will be used. | |
668 | * | |
669 | * Discard any existing register cache for the map and initialize a | |
670 | * new cache. This can be used to restore the cache to defaults or to | |
671 | * update the cache configuration to reflect runtime discovery of the | |
672 | * hardware. | |
4d879514 DP |
673 | * |
674 | * No explicit locking is done here, the user needs to ensure that | |
675 | * this function will not race with other calls to regmap. | |
bf315173 MB |
676 | */ |
677 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
678 | { | |
bf315173 | 679 | regcache_exit(map); |
a24f64a6 | 680 | regmap_debugfs_exit(map); |
bf315173 MB |
681 | |
682 | map->max_register = config->max_register; | |
683 | map->writeable_reg = config->writeable_reg; | |
684 | map->readable_reg = config->readable_reg; | |
685 | map->volatile_reg = config->volatile_reg; | |
686 | map->precious_reg = config->precious_reg; | |
687 | map->cache_type = config->cache_type; | |
688 | ||
d3c242e1 | 689 | regmap_debugfs_init(map, config->name); |
a24f64a6 | 690 | |
421e8d2d MB |
691 | map->cache_bypass = false; |
692 | map->cache_only = false; | |
693 | ||
4d879514 | 694 | return regcache_init(map, config); |
bf315173 | 695 | } |
752a6a5f | 696 | EXPORT_SYMBOL_GPL(regmap_reinit_cache); |
bf315173 | 697 | |
b83a313b MB |
698 | /** |
699 | * regmap_exit(): Free a previously allocated register map | |
700 | */ | |
701 | void regmap_exit(struct regmap *map) | |
702 | { | |
5d1729e7 | 703 | regcache_exit(map); |
31244e39 | 704 | regmap_debugfs_exit(map); |
6863ca62 | 705 | regmap_range_exit(map); |
0135bbcc SW |
706 | if (map->bus->free_context) |
707 | map->bus->free_context(map->bus_context); | |
b83a313b | 708 | kfree(map->work_buf); |
b83a313b MB |
709 | kfree(map); |
710 | } | |
711 | EXPORT_SYMBOL_GPL(regmap_exit); | |
712 | ||
72b39f6f MB |
713 | static int dev_get_regmap_match(struct device *dev, void *res, void *data) |
714 | { | |
715 | struct regmap **r = res; | |
716 | if (!r || !*r) { | |
717 | WARN_ON(!r || !*r); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* If the user didn't specify a name match any */ | |
722 | if (data) | |
723 | return (*r)->name == data; | |
724 | else | |
725 | return 1; | |
726 | } | |
727 | ||
728 | /** | |
729 | * dev_get_regmap(): Obtain the regmap (if any) for a device | |
730 | * | |
731 | * @dev: Device to retrieve the map for | |
732 | * @name: Optional name for the register map, usually NULL. | |
733 | * | |
734 | * Returns the regmap for the device if one is present, or NULL. If | |
735 | * name is specified then it must match the name specified when | |
736 | * registering the device, if it is NULL then the first regmap found | |
737 | * will be used. Devices with multiple register maps are very rare, | |
738 | * generic code should normally not need to specify a name. | |
739 | */ | |
740 | struct regmap *dev_get_regmap(struct device *dev, const char *name) | |
741 | { | |
742 | struct regmap **r = devres_find(dev, dev_get_regmap_release, | |
743 | dev_get_regmap_match, (void *)name); | |
744 | ||
745 | if (!r) | |
746 | return NULL; | |
747 | return *r; | |
748 | } | |
749 | EXPORT_SYMBOL_GPL(dev_get_regmap); | |
750 | ||
6863ca62 KG |
751 | static int _regmap_select_page(struct regmap *map, unsigned int *reg, |
752 | unsigned int val_num) | |
753 | { | |
754 | struct regmap_range_node *range; | |
755 | void *orig_work_buf; | |
756 | unsigned int win_offset; | |
757 | unsigned int win_page; | |
758 | bool page_chg; | |
759 | int ret; | |
760 | ||
761 | range = _regmap_range_lookup(map, *reg); | |
762 | if (range) { | |
763 | win_offset = (*reg - range->range_min) % range->window_len; | |
764 | win_page = (*reg - range->range_min) / range->window_len; | |
765 | ||
766 | if (val_num > 1) { | |
767 | /* Bulk write shouldn't cross range boundary */ | |
768 | if (*reg + val_num - 1 > range->range_max) | |
769 | return -EINVAL; | |
770 | ||
771 | /* ... or single page boundary */ | |
772 | if (val_num > range->window_len - win_offset) | |
773 | return -EINVAL; | |
774 | } | |
775 | ||
776 | /* It is possible to have selector register inside data window. | |
777 | In that case, selector register is located on every page and | |
778 | it needs no page switching, when accessed alone. */ | |
779 | if (val_num > 1 || | |
780 | range->window_start + win_offset != range->selector_reg) { | |
781 | /* Use separate work_buf during page switching */ | |
782 | orig_work_buf = map->work_buf; | |
783 | map->work_buf = map->selector_work_buf; | |
784 | ||
785 | ret = _regmap_update_bits(map, range->selector_reg, | |
786 | range->selector_mask, | |
787 | win_page << range->selector_shift, | |
788 | &page_chg); | |
6863ca62 KG |
789 | |
790 | map->work_buf = orig_work_buf; | |
632a5b01 KG |
791 | |
792 | if (ret < 0) | |
793 | return ret; | |
6863ca62 KG |
794 | } |
795 | ||
796 | *reg = range->window_start + win_offset; | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
b83a313b MB |
802 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, |
803 | const void *val, size_t val_len) | |
804 | { | |
6f306441 | 805 | u8 *u8 = map->work_buf; |
b83a313b MB |
806 | void *buf; |
807 | int ret = -ENOTSUPP; | |
808 | size_t len; | |
73304781 MB |
809 | int i; |
810 | ||
811 | /* Check for unwritable registers before we start */ | |
812 | if (map->writeable_reg) | |
813 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
f01ee60f SW |
814 | if (!map->writeable_reg(map->dev, |
815 | reg + (i * map->reg_stride))) | |
73304781 | 816 | return -EINVAL; |
b83a313b | 817 | |
c9157198 LD |
818 | if (!map->cache_bypass && map->format.parse_val) { |
819 | unsigned int ival; | |
820 | int val_bytes = map->format.val_bytes; | |
821 | for (i = 0; i < val_len / val_bytes; i++) { | |
822 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
823 | ival = map->format.parse_val(map->work_buf); | |
f01ee60f SW |
824 | ret = regcache_write(map, reg + (i * map->reg_stride), |
825 | ival); | |
c9157198 LD |
826 | if (ret) { |
827 | dev_err(map->dev, | |
828 | "Error in caching of register: %u ret: %d\n", | |
829 | reg + i, ret); | |
830 | return ret; | |
831 | } | |
832 | } | |
833 | if (map->cache_only) { | |
834 | map->cache_dirty = true; | |
835 | return 0; | |
836 | } | |
837 | } | |
838 | ||
6863ca62 KG |
839 | ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes); |
840 | if (ret < 0) | |
841 | return ret; | |
842 | ||
d939fb9a | 843 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b | 844 | |
6f306441 LPC |
845 | u8[0] |= map->write_flag_mask; |
846 | ||
fb2736bb MB |
847 | trace_regmap_hw_write_start(map->dev, reg, |
848 | val_len / map->format.val_bytes); | |
849 | ||
2547e201 MB |
850 | /* If we're doing a single register write we can probably just |
851 | * send the work_buf directly, otherwise try to do a gather | |
852 | * write. | |
853 | */ | |
82159ba8 MB |
854 | if (val == (map->work_buf + map->format.pad_bytes + |
855 | map->format.reg_bytes)) | |
0135bbcc | 856 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
857 | map->format.reg_bytes + |
858 | map->format.pad_bytes + | |
859 | val_len); | |
2547e201 | 860 | else if (map->bus->gather_write) |
0135bbcc | 861 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
862 | map->format.reg_bytes + |
863 | map->format.pad_bytes, | |
b83a313b MB |
864 | val, val_len); |
865 | ||
2547e201 | 866 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 867 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
868 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
869 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
870 | if (!buf) |
871 | return -ENOMEM; | |
872 | ||
873 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
874 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
875 | val, val_len); | |
0135bbcc | 876 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
877 | |
878 | kfree(buf); | |
879 | } | |
880 | ||
fb2736bb MB |
881 | trace_regmap_hw_write_done(map->dev, reg, |
882 | val_len / map->format.val_bytes); | |
883 | ||
b83a313b MB |
884 | return ret; |
885 | } | |
886 | ||
4d2dc095 DP |
887 | int _regmap_write(struct regmap *map, unsigned int reg, |
888 | unsigned int val) | |
b83a313b | 889 | { |
fb2736bb | 890 | int ret; |
b83a313b MB |
891 | BUG_ON(!map->format.format_write && !map->format.format_val); |
892 | ||
c9157198 | 893 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
894 | ret = regcache_write(map, reg, val); |
895 | if (ret != 0) | |
896 | return ret; | |
8ae0d7e8 MB |
897 | if (map->cache_only) { |
898 | map->cache_dirty = true; | |
5d1729e7 | 899 | return 0; |
8ae0d7e8 | 900 | } |
5d1729e7 DP |
901 | } |
902 | ||
1044c180 MB |
903 | #ifdef LOG_DEVICE |
904 | if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0) | |
905 | dev_info(map->dev, "%x <= %x\n", reg, val); | |
906 | #endif | |
907 | ||
fb2736bb MB |
908 | trace_regmap_reg_write(map->dev, reg, val); |
909 | ||
b83a313b | 910 | if (map->format.format_write) { |
6863ca62 KG |
911 | ret = _regmap_select_page(map, ®, 1); |
912 | if (ret < 0) | |
913 | return ret; | |
914 | ||
b83a313b MB |
915 | map->format.format_write(map, reg, val); |
916 | ||
fb2736bb MB |
917 | trace_regmap_hw_write_start(map->dev, reg, 1); |
918 | ||
0135bbcc | 919 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
920 | map->format.buf_size); |
921 | ||
922 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
923 | ||
924 | return ret; | |
b83a313b | 925 | } else { |
82159ba8 | 926 | map->format.format_val(map->work_buf + map->format.reg_bytes |
d939fb9a | 927 | + map->format.pad_bytes, val, 0); |
b83a313b | 928 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
929 | map->work_buf + |
930 | map->format.reg_bytes + | |
931 | map->format.pad_bytes, | |
b83a313b MB |
932 | map->format.val_bytes); |
933 | } | |
934 | } | |
935 | ||
936 | /** | |
937 | * regmap_write(): Write a value to a single register | |
938 | * | |
939 | * @map: Register map to write to | |
940 | * @reg: Register to write to | |
941 | * @val: Value to be written | |
942 | * | |
943 | * A value of zero will be returned on success, a negative errno will | |
944 | * be returned in error cases. | |
945 | */ | |
946 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
947 | { | |
948 | int ret; | |
949 | ||
f01ee60f SW |
950 | if (reg % map->reg_stride) |
951 | return -EINVAL; | |
952 | ||
0d4529c5 | 953 | map->lock(map->lock_arg); |
b83a313b MB |
954 | |
955 | ret = _regmap_write(map, reg, val); | |
956 | ||
0d4529c5 | 957 | map->unlock(map->lock_arg); |
b83a313b MB |
958 | |
959 | return ret; | |
960 | } | |
961 | EXPORT_SYMBOL_GPL(regmap_write); | |
962 | ||
963 | /** | |
964 | * regmap_raw_write(): Write raw values to one or more registers | |
965 | * | |
966 | * @map: Register map to write to | |
967 | * @reg: Initial register to write to | |
968 | * @val: Block of data to be written, laid out for direct transmission to the | |
969 | * device | |
970 | * @val_len: Length of data pointed to by val. | |
971 | * | |
972 | * This function is intended to be used for things like firmware | |
973 | * download where a large block of data needs to be transferred to the | |
974 | * device. No formatting will be done on the data provided. | |
975 | * | |
976 | * A value of zero will be returned on success, a negative errno will | |
977 | * be returned in error cases. | |
978 | */ | |
979 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
980 | const void *val, size_t val_len) | |
981 | { | |
982 | int ret; | |
983 | ||
851960ba SW |
984 | if (val_len % map->format.val_bytes) |
985 | return -EINVAL; | |
f01ee60f SW |
986 | if (reg % map->reg_stride) |
987 | return -EINVAL; | |
851960ba | 988 | |
0d4529c5 | 989 | map->lock(map->lock_arg); |
b83a313b MB |
990 | |
991 | ret = _regmap_raw_write(map, reg, val, val_len); | |
992 | ||
0d4529c5 | 993 | map->unlock(map->lock_arg); |
b83a313b MB |
994 | |
995 | return ret; | |
996 | } | |
997 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
998 | ||
8eaeb219 LD |
999 | /* |
1000 | * regmap_bulk_write(): Write multiple registers to the device | |
1001 | * | |
1002 | * @map: Register map to write to | |
1003 | * @reg: First register to be write from | |
1004 | * @val: Block of data to be written, in native register size for device | |
1005 | * @val_count: Number of registers to write | |
1006 | * | |
1007 | * This function is intended to be used for writing a large block of | |
1008 | * data to be device either in single transfer or multiple transfer. | |
1009 | * | |
1010 | * A value of zero will be returned on success, a negative errno will | |
1011 | * be returned in error cases. | |
1012 | */ | |
1013 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
1014 | size_t val_count) | |
1015 | { | |
1016 | int ret = 0, i; | |
1017 | size_t val_bytes = map->format.val_bytes; | |
1018 | void *wval; | |
1019 | ||
1020 | if (!map->format.parse_val) | |
1021 | return -EINVAL; | |
f01ee60f SW |
1022 | if (reg % map->reg_stride) |
1023 | return -EINVAL; | |
8eaeb219 | 1024 | |
0d4529c5 | 1025 | map->lock(map->lock_arg); |
8eaeb219 LD |
1026 | |
1027 | /* No formatting is require if val_byte is 1 */ | |
1028 | if (val_bytes == 1) { | |
1029 | wval = (void *)val; | |
1030 | } else { | |
1031 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
1032 | if (!wval) { | |
1033 | ret = -ENOMEM; | |
1034 | dev_err(map->dev, "Error in memory allocation\n"); | |
1035 | goto out; | |
1036 | } | |
1037 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
1038 | map->format.parse_val(wval + i); | |
1039 | } | |
2e33caf1 AJ |
1040 | /* |
1041 | * Some devices does not support bulk write, for | |
1042 | * them we have a series of single write operations. | |
1043 | */ | |
1044 | if (map->use_single_rw) { | |
1045 | for (i = 0; i < val_count; i++) { | |
1046 | ret = regmap_raw_write(map, | |
1047 | reg + (i * map->reg_stride), | |
1048 | val + (i * val_bytes), | |
1049 | val_bytes); | |
1050 | if (ret != 0) | |
1051 | return ret; | |
1052 | } | |
1053 | } else { | |
1054 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
1055 | } | |
8eaeb219 LD |
1056 | |
1057 | if (val_bytes != 1) | |
1058 | kfree(wval); | |
1059 | ||
1060 | out: | |
0d4529c5 | 1061 | map->unlock(map->lock_arg); |
8eaeb219 LD |
1062 | return ret; |
1063 | } | |
1064 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
1065 | ||
b83a313b MB |
1066 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
1067 | unsigned int val_len) | |
1068 | { | |
1069 | u8 *u8 = map->work_buf; | |
1070 | int ret; | |
1071 | ||
6863ca62 KG |
1072 | ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes); |
1073 | if (ret < 0) | |
1074 | return ret; | |
1075 | ||
d939fb9a | 1076 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b MB |
1077 | |
1078 | /* | |
6f306441 | 1079 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
1080 | * register addresss; since it's always the high bits for all |
1081 | * current formats we can do this here rather than in | |
1082 | * formatting. This may break if we get interesting formats. | |
1083 | */ | |
6f306441 | 1084 | u8[0] |= map->read_flag_mask; |
b83a313b | 1085 | |
fb2736bb MB |
1086 | trace_regmap_hw_read_start(map->dev, reg, |
1087 | val_len / map->format.val_bytes); | |
1088 | ||
0135bbcc | 1089 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 1090 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 1091 | val, val_len); |
b83a313b | 1092 | |
fb2736bb MB |
1093 | trace_regmap_hw_read_done(map->dev, reg, |
1094 | val_len / map->format.val_bytes); | |
1095 | ||
1096 | return ret; | |
b83a313b MB |
1097 | } |
1098 | ||
1099 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
1100 | unsigned int *val) | |
1101 | { | |
1102 | int ret; | |
1103 | ||
5d1729e7 DP |
1104 | if (!map->cache_bypass) { |
1105 | ret = regcache_read(map, reg, val); | |
1106 | if (ret == 0) | |
1107 | return 0; | |
1108 | } | |
1109 | ||
19254411 LPC |
1110 | if (!map->format.parse_val) |
1111 | return -EINVAL; | |
1112 | ||
5d1729e7 DP |
1113 | if (map->cache_only) |
1114 | return -EBUSY; | |
1115 | ||
b83a313b | 1116 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 1117 | if (ret == 0) { |
b83a313b | 1118 | *val = map->format.parse_val(map->work_buf); |
1044c180 MB |
1119 | |
1120 | #ifdef LOG_DEVICE | |
1121 | if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0) | |
1122 | dev_info(map->dev, "%x => %x\n", reg, *val); | |
1123 | #endif | |
1124 | ||
fb2736bb MB |
1125 | trace_regmap_reg_read(map->dev, reg, *val); |
1126 | } | |
b83a313b | 1127 | |
f2985367 MB |
1128 | if (ret == 0 && !map->cache_bypass) |
1129 | regcache_write(map, reg, *val); | |
1130 | ||
b83a313b MB |
1131 | return ret; |
1132 | } | |
1133 | ||
1134 | /** | |
1135 | * regmap_read(): Read a value from a single register | |
1136 | * | |
1137 | * @map: Register map to write to | |
1138 | * @reg: Register to be read from | |
1139 | * @val: Pointer to store read value | |
1140 | * | |
1141 | * A value of zero will be returned on success, a negative errno will | |
1142 | * be returned in error cases. | |
1143 | */ | |
1144 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
1145 | { | |
1146 | int ret; | |
1147 | ||
f01ee60f SW |
1148 | if (reg % map->reg_stride) |
1149 | return -EINVAL; | |
1150 | ||
0d4529c5 | 1151 | map->lock(map->lock_arg); |
b83a313b MB |
1152 | |
1153 | ret = _regmap_read(map, reg, val); | |
1154 | ||
0d4529c5 | 1155 | map->unlock(map->lock_arg); |
b83a313b MB |
1156 | |
1157 | return ret; | |
1158 | } | |
1159 | EXPORT_SYMBOL_GPL(regmap_read); | |
1160 | ||
1161 | /** | |
1162 | * regmap_raw_read(): Read raw data from the device | |
1163 | * | |
1164 | * @map: Register map to write to | |
1165 | * @reg: First register to be read from | |
1166 | * @val: Pointer to store read value | |
1167 | * @val_len: Size of data to read | |
1168 | * | |
1169 | * A value of zero will be returned on success, a negative errno will | |
1170 | * be returned in error cases. | |
1171 | */ | |
1172 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
1173 | size_t val_len) | |
1174 | { | |
b8fb5ab1 MB |
1175 | size_t val_bytes = map->format.val_bytes; |
1176 | size_t val_count = val_len / val_bytes; | |
1177 | unsigned int v; | |
1178 | int ret, i; | |
04e016ad | 1179 | |
851960ba SW |
1180 | if (val_len % map->format.val_bytes) |
1181 | return -EINVAL; | |
f01ee60f SW |
1182 | if (reg % map->reg_stride) |
1183 | return -EINVAL; | |
851960ba | 1184 | |
0d4529c5 | 1185 | map->lock(map->lock_arg); |
b83a313b | 1186 | |
b8fb5ab1 MB |
1187 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
1188 | map->cache_type == REGCACHE_NONE) { | |
1189 | /* Physical block read if there's no cache involved */ | |
1190 | ret = _regmap_raw_read(map, reg, val, val_len); | |
1191 | ||
1192 | } else { | |
1193 | /* Otherwise go word by word for the cache; should be low | |
1194 | * cost as we expect to hit the cache. | |
1195 | */ | |
1196 | for (i = 0; i < val_count; i++) { | |
f01ee60f SW |
1197 | ret = _regmap_read(map, reg + (i * map->reg_stride), |
1198 | &v); | |
b8fb5ab1 MB |
1199 | if (ret != 0) |
1200 | goto out; | |
1201 | ||
d939fb9a | 1202 | map->format.format_val(val + (i * val_bytes), v, 0); |
b8fb5ab1 MB |
1203 | } |
1204 | } | |
b83a313b | 1205 | |
b8fb5ab1 | 1206 | out: |
0d4529c5 | 1207 | map->unlock(map->lock_arg); |
b83a313b MB |
1208 | |
1209 | return ret; | |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
1212 | ||
1213 | /** | |
1214 | * regmap_bulk_read(): Read multiple registers from the device | |
1215 | * | |
1216 | * @map: Register map to write to | |
1217 | * @reg: First register to be read from | |
1218 | * @val: Pointer to store read value, in native register size for device | |
1219 | * @val_count: Number of registers to read | |
1220 | * | |
1221 | * A value of zero will be returned on success, a negative errno will | |
1222 | * be returned in error cases. | |
1223 | */ | |
1224 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
1225 | size_t val_count) | |
1226 | { | |
1227 | int ret, i; | |
1228 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 1229 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 1230 | |
b83a313b MB |
1231 | if (!map->format.parse_val) |
1232 | return -EINVAL; | |
f01ee60f SW |
1233 | if (reg % map->reg_stride) |
1234 | return -EINVAL; | |
b83a313b | 1235 | |
de2d808f | 1236 | if (vol || map->cache_type == REGCACHE_NONE) { |
2e33caf1 AJ |
1237 | /* |
1238 | * Some devices does not support bulk read, for | |
1239 | * them we have a series of single read operations. | |
1240 | */ | |
1241 | if (map->use_single_rw) { | |
1242 | for (i = 0; i < val_count; i++) { | |
1243 | ret = regmap_raw_read(map, | |
1244 | reg + (i * map->reg_stride), | |
1245 | val + (i * val_bytes), | |
1246 | val_bytes); | |
1247 | if (ret != 0) | |
1248 | return ret; | |
1249 | } | |
1250 | } else { | |
1251 | ret = regmap_raw_read(map, reg, val, | |
1252 | val_bytes * val_count); | |
1253 | if (ret != 0) | |
1254 | return ret; | |
1255 | } | |
de2d808f MB |
1256 | |
1257 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
1258 | map->format.parse_val(val + i); | |
1259 | } else { | |
1260 | for (i = 0; i < val_count; i++) { | |
6560ffd1 | 1261 | unsigned int ival; |
f01ee60f | 1262 | ret = regmap_read(map, reg + (i * map->reg_stride), |
25061d28 | 1263 | &ival); |
de2d808f MB |
1264 | if (ret != 0) |
1265 | return ret; | |
6560ffd1 | 1266 | memcpy(val + (i * val_bytes), &ival, val_bytes); |
de2d808f MB |
1267 | } |
1268 | } | |
b83a313b MB |
1269 | |
1270 | return 0; | |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
1273 | ||
018690d3 MB |
1274 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
1275 | unsigned int mask, unsigned int val, | |
1276 | bool *change) | |
b83a313b MB |
1277 | { |
1278 | int ret; | |
d91e8db2 | 1279 | unsigned int tmp, orig; |
b83a313b | 1280 | |
d91e8db2 | 1281 | ret = _regmap_read(map, reg, &orig); |
b83a313b | 1282 | if (ret != 0) |
fc3ebd78 | 1283 | return ret; |
b83a313b | 1284 | |
d91e8db2 | 1285 | tmp = orig & ~mask; |
b83a313b MB |
1286 | tmp |= val & mask; |
1287 | ||
018690d3 | 1288 | if (tmp != orig) { |
d91e8db2 | 1289 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
1290 | *change = true; |
1291 | } else { | |
1292 | *change = false; | |
1293 | } | |
b83a313b | 1294 | |
b83a313b MB |
1295 | return ret; |
1296 | } | |
018690d3 MB |
1297 | |
1298 | /** | |
1299 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
1300 | * | |
1301 | * @map: Register map to update | |
1302 | * @reg: Register to update | |
1303 | * @mask: Bitmask to change | |
1304 | * @val: New value for bitmask | |
1305 | * | |
1306 | * Returns zero for success, a negative number on error. | |
1307 | */ | |
1308 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
1309 | unsigned int mask, unsigned int val) | |
1310 | { | |
1311 | bool change; | |
fc3ebd78 KG |
1312 | int ret; |
1313 | ||
0d4529c5 | 1314 | map->lock(map->lock_arg); |
fc3ebd78 | 1315 | ret = _regmap_update_bits(map, reg, mask, val, &change); |
0d4529c5 | 1316 | map->unlock(map->lock_arg); |
fc3ebd78 KG |
1317 | |
1318 | return ret; | |
018690d3 | 1319 | } |
b83a313b | 1320 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 1321 | |
018690d3 MB |
1322 | /** |
1323 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
1324 | * register map and report if updated | |
1325 | * | |
1326 | * @map: Register map to update | |
1327 | * @reg: Register to update | |
1328 | * @mask: Bitmask to change | |
1329 | * @val: New value for bitmask | |
1330 | * @change: Boolean indicating if a write was done | |
1331 | * | |
1332 | * Returns zero for success, a negative number on error. | |
1333 | */ | |
1334 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
1335 | unsigned int mask, unsigned int val, | |
1336 | bool *change) | |
1337 | { | |
fc3ebd78 KG |
1338 | int ret; |
1339 | ||
0d4529c5 | 1340 | map->lock(map->lock_arg); |
fc3ebd78 | 1341 | ret = _regmap_update_bits(map, reg, mask, val, change); |
0d4529c5 | 1342 | map->unlock(map->lock_arg); |
fc3ebd78 | 1343 | return ret; |
018690d3 MB |
1344 | } |
1345 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
1346 | ||
22f0d90a MB |
1347 | /** |
1348 | * regmap_register_patch: Register and apply register updates to be applied | |
1349 | * on device initialistion | |
1350 | * | |
1351 | * @map: Register map to apply updates to. | |
1352 | * @regs: Values to update. | |
1353 | * @num_regs: Number of entries in regs. | |
1354 | * | |
1355 | * Register a set of register updates to be applied to the device | |
1356 | * whenever the device registers are synchronised with the cache and | |
1357 | * apply them immediately. Typically this is used to apply | |
1358 | * corrections to be applied to the device defaults on startup, such | |
1359 | * as the updates some vendors provide to undocumented registers. | |
1360 | */ | |
1361 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
1362 | int num_regs) | |
1363 | { | |
1364 | int i, ret; | |
1365 | bool bypass; | |
1366 | ||
1367 | /* If needed the implementation can be extended to support this */ | |
1368 | if (map->patch) | |
1369 | return -EBUSY; | |
1370 | ||
0d4529c5 | 1371 | map->lock(map->lock_arg); |
22f0d90a MB |
1372 | |
1373 | bypass = map->cache_bypass; | |
1374 | ||
1375 | map->cache_bypass = true; | |
1376 | ||
1377 | /* Write out first; it's useful to apply even if we fail later. */ | |
1378 | for (i = 0; i < num_regs; i++) { | |
1379 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
1380 | if (ret != 0) { | |
1381 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
1382 | regs[i].reg, regs[i].def, ret); | |
1383 | goto out; | |
1384 | } | |
1385 | } | |
1386 | ||
2a14d7d9 | 1387 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
1388 | if (map->patch != NULL) { |
1389 | memcpy(map->patch, regs, | |
1390 | num_regs * sizeof(struct reg_default)); | |
1391 | map->patch_regs = num_regs; | |
1392 | } else { | |
1393 | ret = -ENOMEM; | |
1394 | } | |
1395 | ||
1396 | out: | |
1397 | map->cache_bypass = bypass; | |
1398 | ||
0d4529c5 | 1399 | map->unlock(map->lock_arg); |
22f0d90a MB |
1400 | |
1401 | return ret; | |
1402 | } | |
1403 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
1404 | ||
eae4b51b | 1405 | /* |
a6539c32 MB |
1406 | * regmap_get_val_bytes(): Report the size of a register value |
1407 | * | |
1408 | * Report the size of a register value, mainly intended to for use by | |
1409 | * generic infrastructure built on top of regmap. | |
1410 | */ | |
1411 | int regmap_get_val_bytes(struct regmap *map) | |
1412 | { | |
1413 | if (map->format.format_write) | |
1414 | return -EINVAL; | |
1415 | ||
1416 | return map->format.val_bytes; | |
1417 | } | |
1418 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
1419 | ||
31244e39 MB |
1420 | static int __init regmap_initcall(void) |
1421 | { | |
1422 | regmap_debugfs_initcall(); | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | postcore_initcall(regmap_initcall); |