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