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d6c84047b9574f9dc03553656e06b380adab058f
[deliverable/linux.git] / drivers / base / regmap / regmap.c
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
13 #include <linux/device.h>
14 #include <linux/slab.h>
15 #include <linux/export.h>
16 #include <linux/mutex.h>
17 #include <linux/err.h>
18 #include <linux/of.h>
19 #include <linux/rbtree.h>
20 #include <linux/sched.h>
21
22 #define CREATE_TRACE_POINTS
23 #include "trace.h"
24
25 #include "internal.h"
26
27 /*
28 * Sometimes for failures during very early init the trace
29 * infrastructure isn't available early enough to be used. For this
30 * sort of problem defining LOG_DEVICE will add printks for basic
31 * register I/O on a specific device.
32 */
33 #undef LOG_DEVICE
34
35 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
36 unsigned int mask, unsigned int val,
37 bool *change);
38
39 static int _regmap_bus_reg_read(void *context, unsigned int reg,
40 unsigned int *val);
41 static int _regmap_bus_read(void *context, unsigned int reg,
42 unsigned int *val);
43 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
44 unsigned int val);
45 static int _regmap_bus_reg_write(void *context, unsigned int reg,
46 unsigned int val);
47 static int _regmap_bus_raw_write(void *context, unsigned int reg,
48 unsigned int val);
49
50 bool regmap_reg_in_ranges(unsigned int reg,
51 const struct regmap_range *ranges,
52 unsigned int nranges)
53 {
54 const struct regmap_range *r;
55 int i;
56
57 for (i = 0, r = ranges; i < nranges; i++, r++)
58 if (regmap_reg_in_range(reg, r))
59 return true;
60 return false;
61 }
62 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
63
64 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
65 const struct regmap_access_table *table)
66 {
67 /* Check "no ranges" first */
68 if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
69 return false;
70
71 /* In case zero "yes ranges" are supplied, any reg is OK */
72 if (!table->n_yes_ranges)
73 return true;
74
75 return regmap_reg_in_ranges(reg, table->yes_ranges,
76 table->n_yes_ranges);
77 }
78 EXPORT_SYMBOL_GPL(regmap_check_range_table);
79
80 bool regmap_writeable(struct regmap *map, unsigned int reg)
81 {
82 if (map->max_register && reg > map->max_register)
83 return false;
84
85 if (map->writeable_reg)
86 return map->writeable_reg(map->dev, reg);
87
88 if (map->wr_table)
89 return regmap_check_range_table(map, reg, map->wr_table);
90
91 return true;
92 }
93
94 bool regmap_readable(struct regmap *map, unsigned int reg)
95 {
96 if (map->max_register && reg > map->max_register)
97 return false;
98
99 if (map->format.format_write)
100 return false;
101
102 if (map->readable_reg)
103 return map->readable_reg(map->dev, reg);
104
105 if (map->rd_table)
106 return regmap_check_range_table(map, reg, map->rd_table);
107
108 return true;
109 }
110
111 bool regmap_volatile(struct regmap *map, unsigned int reg)
112 {
113 if (!map->format.format_write && !regmap_readable(map, reg))
114 return false;
115
116 if (map->volatile_reg)
117 return map->volatile_reg(map->dev, reg);
118
119 if (map->volatile_table)
120 return regmap_check_range_table(map, reg, map->volatile_table);
121
122 if (map->cache_ops)
123 return false;
124 else
125 return true;
126 }
127
128 bool regmap_precious(struct regmap *map, unsigned int reg)
129 {
130 if (!regmap_readable(map, reg))
131 return false;
132
133 if (map->precious_reg)
134 return map->precious_reg(map->dev, reg);
135
136 if (map->precious_table)
137 return regmap_check_range_table(map, reg, map->precious_table);
138
139 return false;
140 }
141
142 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
143 size_t num)
144 {
145 unsigned int i;
146
147 for (i = 0; i < num; i++)
148 if (!regmap_volatile(map, reg + i))
149 return false;
150
151 return true;
152 }
153
154 static void regmap_format_2_6_write(struct regmap *map,
155 unsigned int reg, unsigned int val)
156 {
157 u8 *out = map->work_buf;
158
159 *out = (reg << 6) | val;
160 }
161
162 static void regmap_format_4_12_write(struct regmap *map,
163 unsigned int reg, unsigned int val)
164 {
165 __be16 *out = map->work_buf;
166 *out = cpu_to_be16((reg << 12) | val);
167 }
168
169 static void regmap_format_7_9_write(struct regmap *map,
170 unsigned int reg, unsigned int val)
171 {
172 __be16 *out = map->work_buf;
173 *out = cpu_to_be16((reg << 9) | val);
174 }
175
176 static void regmap_format_10_14_write(struct regmap *map,
177 unsigned int reg, unsigned int val)
178 {
179 u8 *out = map->work_buf;
180
181 out[2] = val;
182 out[1] = (val >> 8) | (reg << 6);
183 out[0] = reg >> 2;
184 }
185
186 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
187 {
188 u8 *b = buf;
189
190 b[0] = val << shift;
191 }
192
193 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
194 {
195 __be16 *b = buf;
196
197 b[0] = cpu_to_be16(val << shift);
198 }
199
200 static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
201 {
202 __le16 *b = buf;
203
204 b[0] = cpu_to_le16(val << shift);
205 }
206
207 static void regmap_format_16_native(void *buf, unsigned int val,
208 unsigned int shift)
209 {
210 *(u16 *)buf = val << shift;
211 }
212
213 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
214 {
215 u8 *b = buf;
216
217 val <<= shift;
218
219 b[0] = val >> 16;
220 b[1] = val >> 8;
221 b[2] = val;
222 }
223
224 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
225 {
226 __be32 *b = buf;
227
228 b[0] = cpu_to_be32(val << shift);
229 }
230
231 static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
232 {
233 __le32 *b = buf;
234
235 b[0] = cpu_to_le32(val << shift);
236 }
237
238 static void regmap_format_32_native(void *buf, unsigned int val,
239 unsigned int shift)
240 {
241 *(u32 *)buf = val << shift;
242 }
243
244 static void regmap_parse_inplace_noop(void *buf)
245 {
246 }
247
248 static unsigned int regmap_parse_8(const void *buf)
249 {
250 const u8 *b = buf;
251
252 return b[0];
253 }
254
255 static unsigned int regmap_parse_16_be(const void *buf)
256 {
257 const __be16 *b = buf;
258
259 return be16_to_cpu(b[0]);
260 }
261
262 static unsigned int regmap_parse_16_le(const void *buf)
263 {
264 const __le16 *b = buf;
265
266 return le16_to_cpu(b[0]);
267 }
268
269 static void regmap_parse_16_be_inplace(void *buf)
270 {
271 __be16 *b = buf;
272
273 b[0] = be16_to_cpu(b[0]);
274 }
275
276 static void regmap_parse_16_le_inplace(void *buf)
277 {
278 __le16 *b = buf;
279
280 b[0] = le16_to_cpu(b[0]);
281 }
282
283 static unsigned int regmap_parse_16_native(const void *buf)
284 {
285 return *(u16 *)buf;
286 }
287
288 static unsigned int regmap_parse_24(const void *buf)
289 {
290 const u8 *b = buf;
291 unsigned int ret = b[2];
292 ret |= ((unsigned int)b[1]) << 8;
293 ret |= ((unsigned int)b[0]) << 16;
294
295 return ret;
296 }
297
298 static unsigned int regmap_parse_32_be(const void *buf)
299 {
300 const __be32 *b = buf;
301
302 return be32_to_cpu(b[0]);
303 }
304
305 static unsigned int regmap_parse_32_le(const void *buf)
306 {
307 const __le32 *b = buf;
308
309 return le32_to_cpu(b[0]);
310 }
311
312 static void regmap_parse_32_be_inplace(void *buf)
313 {
314 __be32 *b = buf;
315
316 b[0] = be32_to_cpu(b[0]);
317 }
318
319 static void regmap_parse_32_le_inplace(void *buf)
320 {
321 __le32 *b = buf;
322
323 b[0] = le32_to_cpu(b[0]);
324 }
325
326 static unsigned int regmap_parse_32_native(const void *buf)
327 {
328 return *(u32 *)buf;
329 }
330
331 static void regmap_lock_mutex(void *__map)
332 {
333 struct regmap *map = __map;
334 mutex_lock(&map->mutex);
335 }
336
337 static void regmap_unlock_mutex(void *__map)
338 {
339 struct regmap *map = __map;
340 mutex_unlock(&map->mutex);
341 }
342
343 static void regmap_lock_spinlock(void *__map)
344 __acquires(&map->spinlock)
345 {
346 struct regmap *map = __map;
347 unsigned long flags;
348
349 spin_lock_irqsave(&map->spinlock, flags);
350 map->spinlock_flags = flags;
351 }
352
353 static void regmap_unlock_spinlock(void *__map)
354 __releases(&map->spinlock)
355 {
356 struct regmap *map = __map;
357 spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
358 }
359
360 static void dev_get_regmap_release(struct device *dev, void *res)
361 {
362 /*
363 * We don't actually have anything to do here; the goal here
364 * is not to manage the regmap but to provide a simple way to
365 * get the regmap back given a struct device.
366 */
367 }
368
369 static bool _regmap_range_add(struct regmap *map,
370 struct regmap_range_node *data)
371 {
372 struct rb_root *root = &map->range_tree;
373 struct rb_node **new = &(root->rb_node), *parent = NULL;
374
375 while (*new) {
376 struct regmap_range_node *this =
377 container_of(*new, struct regmap_range_node, node);
378
379 parent = *new;
380 if (data->range_max < this->range_min)
381 new = &((*new)->rb_left);
382 else if (data->range_min > this->range_max)
383 new = &((*new)->rb_right);
384 else
385 return false;
386 }
387
388 rb_link_node(&data->node, parent, new);
389 rb_insert_color(&data->node, root);
390
391 return true;
392 }
393
394 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
395 unsigned int reg)
396 {
397 struct rb_node *node = map->range_tree.rb_node;
398
399 while (node) {
400 struct regmap_range_node *this =
401 container_of(node, struct regmap_range_node, node);
402
403 if (reg < this->range_min)
404 node = node->rb_left;
405 else if (reg > this->range_max)
406 node = node->rb_right;
407 else
408 return this;
409 }
410
411 return NULL;
412 }
413
414 static void regmap_range_exit(struct regmap *map)
415 {
416 struct rb_node *next;
417 struct regmap_range_node *range_node;
418
419 next = rb_first(&map->range_tree);
420 while (next) {
421 range_node = rb_entry(next, struct regmap_range_node, node);
422 next = rb_next(&range_node->node);
423 rb_erase(&range_node->node, &map->range_tree);
424 kfree(range_node);
425 }
426
427 kfree(map->selector_work_buf);
428 }
429
430 int regmap_attach_dev(struct device *dev, struct regmap *map,
431 const struct regmap_config *config)
432 {
433 struct regmap **m;
434
435 map->dev = dev;
436
437 regmap_debugfs_init(map, config->name);
438
439 /* Add a devres resource for dev_get_regmap() */
440 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
441 if (!m) {
442 regmap_debugfs_exit(map);
443 return -ENOMEM;
444 }
445 *m = map;
446 devres_add(dev, m);
447
448 return 0;
449 }
450 EXPORT_SYMBOL_GPL(regmap_attach_dev);
451
452 static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
453 const struct regmap_config *config)
454 {
455 enum regmap_endian endian;
456
457 /* Retrieve the endianness specification from the regmap config */
458 endian = config->reg_format_endian;
459
460 /* If the regmap config specified a non-default value, use that */
461 if (endian != REGMAP_ENDIAN_DEFAULT)
462 return endian;
463
464 /* Retrieve the endianness specification from the bus config */
465 if (bus && bus->reg_format_endian_default)
466 endian = bus->reg_format_endian_default;
467
468 /* If the bus specified a non-default value, use that */
469 if (endian != REGMAP_ENDIAN_DEFAULT)
470 return endian;
471
472 /* Use this if no other value was found */
473 return REGMAP_ENDIAN_BIG;
474 }
475
476 enum regmap_endian regmap_get_val_endian(struct device *dev,
477 const struct regmap_bus *bus,
478 const struct regmap_config *config)
479 {
480 struct device_node *np;
481 enum regmap_endian endian;
482
483 /* Retrieve the endianness specification from the regmap config */
484 endian = config->val_format_endian;
485
486 /* If the regmap config specified a non-default value, use that */
487 if (endian != REGMAP_ENDIAN_DEFAULT)
488 return endian;
489
490 /* If the dev and dev->of_node exist try to get endianness from DT */
491 if (dev && dev->of_node) {
492 np = dev->of_node;
493
494 /* Parse the device's DT node for an endianness specification */
495 if (of_property_read_bool(np, "big-endian"))
496 endian = REGMAP_ENDIAN_BIG;
497 else if (of_property_read_bool(np, "little-endian"))
498 endian = REGMAP_ENDIAN_LITTLE;
499
500 /* If the endianness was specified in DT, use that */
501 if (endian != REGMAP_ENDIAN_DEFAULT)
502 return endian;
503 }
504
505 /* Retrieve the endianness specification from the bus config */
506 if (bus && bus->val_format_endian_default)
507 endian = bus->val_format_endian_default;
508
509 /* If the bus specified a non-default value, use that */
510 if (endian != REGMAP_ENDIAN_DEFAULT)
511 return endian;
512
513 /* Use this if no other value was found */
514 return REGMAP_ENDIAN_BIG;
515 }
516 EXPORT_SYMBOL_GPL(regmap_get_val_endian);
517
518 /**
519 * regmap_init(): Initialise register map
520 *
521 * @dev: Device that will be interacted with
522 * @bus: Bus-specific callbacks to use with device
523 * @bus_context: Data passed to bus-specific callbacks
524 * @config: Configuration for register map
525 *
526 * The return value will be an ERR_PTR() on error or a valid pointer to
527 * a struct regmap. This function should generally not be called
528 * directly, it should be called by bus-specific init functions.
529 */
530 struct regmap *regmap_init(struct device *dev,
531 const struct regmap_bus *bus,
532 void *bus_context,
533 const struct regmap_config *config)
534 {
535 struct regmap *map;
536 int ret = -EINVAL;
537 enum regmap_endian reg_endian, val_endian;
538 int i, j;
539
540 if (!config)
541 goto err;
542
543 map = kzalloc(sizeof(*map), GFP_KERNEL);
544 if (map == NULL) {
545 ret = -ENOMEM;
546 goto err;
547 }
548
549 if (config->lock && config->unlock) {
550 map->lock = config->lock;
551 map->unlock = config->unlock;
552 map->lock_arg = config->lock_arg;
553 } else {
554 if ((bus && bus->fast_io) ||
555 config->fast_io) {
556 spin_lock_init(&map->spinlock);
557 map->lock = regmap_lock_spinlock;
558 map->unlock = regmap_unlock_spinlock;
559 } else {
560 mutex_init(&map->mutex);
561 map->lock = regmap_lock_mutex;
562 map->unlock = regmap_unlock_mutex;
563 }
564 map->lock_arg = map;
565 }
566 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
567 map->format.pad_bytes = config->pad_bits / 8;
568 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
569 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
570 config->val_bits + config->pad_bits, 8);
571 map->reg_shift = config->pad_bits % 8;
572 if (config->reg_stride)
573 map->reg_stride = config->reg_stride;
574 else
575 map->reg_stride = 1;
576 map->use_single_rw = config->use_single_rw;
577 map->can_multi_write = config->can_multi_write;
578 map->dev = dev;
579 map->bus = bus;
580 map->bus_context = bus_context;
581 map->max_register = config->max_register;
582 map->wr_table = config->wr_table;
583 map->rd_table = config->rd_table;
584 map->volatile_table = config->volatile_table;
585 map->precious_table = config->precious_table;
586 map->writeable_reg = config->writeable_reg;
587 map->readable_reg = config->readable_reg;
588 map->volatile_reg = config->volatile_reg;
589 map->precious_reg = config->precious_reg;
590 map->cache_type = config->cache_type;
591 map->name = config->name;
592
593 spin_lock_init(&map->async_lock);
594 INIT_LIST_HEAD(&map->async_list);
595 INIT_LIST_HEAD(&map->async_free);
596 init_waitqueue_head(&map->async_waitq);
597
598 if (config->read_flag_mask || config->write_flag_mask) {
599 map->read_flag_mask = config->read_flag_mask;
600 map->write_flag_mask = config->write_flag_mask;
601 } else if (bus) {
602 map->read_flag_mask = bus->read_flag_mask;
603 }
604
605 if (!bus) {
606 map->reg_read = config->reg_read;
607 map->reg_write = config->reg_write;
608
609 map->defer_caching = false;
610 goto skip_format_initialization;
611 } else if (!bus->read || !bus->write) {
612 map->reg_read = _regmap_bus_reg_read;
613 map->reg_write = _regmap_bus_reg_write;
614
615 map->defer_caching = false;
616 goto skip_format_initialization;
617 } else {
618 map->reg_read = _regmap_bus_read;
619 }
620
621 reg_endian = regmap_get_reg_endian(bus, config);
622 val_endian = regmap_get_val_endian(dev, bus, config);
623
624 switch (config->reg_bits + map->reg_shift) {
625 case 2:
626 switch (config->val_bits) {
627 case 6:
628 map->format.format_write = regmap_format_2_6_write;
629 break;
630 default:
631 goto err_map;
632 }
633 break;
634
635 case 4:
636 switch (config->val_bits) {
637 case 12:
638 map->format.format_write = regmap_format_4_12_write;
639 break;
640 default:
641 goto err_map;
642 }
643 break;
644
645 case 7:
646 switch (config->val_bits) {
647 case 9:
648 map->format.format_write = regmap_format_7_9_write;
649 break;
650 default:
651 goto err_map;
652 }
653 break;
654
655 case 10:
656 switch (config->val_bits) {
657 case 14:
658 map->format.format_write = regmap_format_10_14_write;
659 break;
660 default:
661 goto err_map;
662 }
663 break;
664
665 case 8:
666 map->format.format_reg = regmap_format_8;
667 break;
668
669 case 16:
670 switch (reg_endian) {
671 case REGMAP_ENDIAN_BIG:
672 map->format.format_reg = regmap_format_16_be;
673 break;
674 case REGMAP_ENDIAN_NATIVE:
675 map->format.format_reg = regmap_format_16_native;
676 break;
677 default:
678 goto err_map;
679 }
680 break;
681
682 case 24:
683 if (reg_endian != REGMAP_ENDIAN_BIG)
684 goto err_map;
685 map->format.format_reg = regmap_format_24;
686 break;
687
688 case 32:
689 switch (reg_endian) {
690 case REGMAP_ENDIAN_BIG:
691 map->format.format_reg = regmap_format_32_be;
692 break;
693 case REGMAP_ENDIAN_NATIVE:
694 map->format.format_reg = regmap_format_32_native;
695 break;
696 default:
697 goto err_map;
698 }
699 break;
700
701 default:
702 goto err_map;
703 }
704
705 if (val_endian == REGMAP_ENDIAN_NATIVE)
706 map->format.parse_inplace = regmap_parse_inplace_noop;
707
708 switch (config->val_bits) {
709 case 8:
710 map->format.format_val = regmap_format_8;
711 map->format.parse_val = regmap_parse_8;
712 map->format.parse_inplace = regmap_parse_inplace_noop;
713 break;
714 case 16:
715 switch (val_endian) {
716 case REGMAP_ENDIAN_BIG:
717 map->format.format_val = regmap_format_16_be;
718 map->format.parse_val = regmap_parse_16_be;
719 map->format.parse_inplace = regmap_parse_16_be_inplace;
720 break;
721 case REGMAP_ENDIAN_LITTLE:
722 map->format.format_val = regmap_format_16_le;
723 map->format.parse_val = regmap_parse_16_le;
724 map->format.parse_inplace = regmap_parse_16_le_inplace;
725 break;
726 case REGMAP_ENDIAN_NATIVE:
727 map->format.format_val = regmap_format_16_native;
728 map->format.parse_val = regmap_parse_16_native;
729 break;
730 default:
731 goto err_map;
732 }
733 break;
734 case 24:
735 if (val_endian != REGMAP_ENDIAN_BIG)
736 goto err_map;
737 map->format.format_val = regmap_format_24;
738 map->format.parse_val = regmap_parse_24;
739 break;
740 case 32:
741 switch (val_endian) {
742 case REGMAP_ENDIAN_BIG:
743 map->format.format_val = regmap_format_32_be;
744 map->format.parse_val = regmap_parse_32_be;
745 map->format.parse_inplace = regmap_parse_32_be_inplace;
746 break;
747 case REGMAP_ENDIAN_LITTLE:
748 map->format.format_val = regmap_format_32_le;
749 map->format.parse_val = regmap_parse_32_le;
750 map->format.parse_inplace = regmap_parse_32_le_inplace;
751 break;
752 case REGMAP_ENDIAN_NATIVE:
753 map->format.format_val = regmap_format_32_native;
754 map->format.parse_val = regmap_parse_32_native;
755 break;
756 default:
757 goto err_map;
758 }
759 break;
760 }
761
762 if (map->format.format_write) {
763 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
764 (val_endian != REGMAP_ENDIAN_BIG))
765 goto err_map;
766 map->use_single_rw = true;
767 }
768
769 if (!map->format.format_write &&
770 !(map->format.format_reg && map->format.format_val))
771 goto err_map;
772
773 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
774 if (map->work_buf == NULL) {
775 ret = -ENOMEM;
776 goto err_map;
777 }
778
779 if (map->format.format_write) {
780 map->defer_caching = false;
781 map->reg_write = _regmap_bus_formatted_write;
782 } else if (map->format.format_val) {
783 map->defer_caching = true;
784 map->reg_write = _regmap_bus_raw_write;
785 }
786
787 skip_format_initialization:
788
789 map->range_tree = RB_ROOT;
790 for (i = 0; i < config->num_ranges; i++) {
791 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
792 struct regmap_range_node *new;
793
794 /* Sanity check */
795 if (range_cfg->range_max < range_cfg->range_min) {
796 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
797 range_cfg->range_max, range_cfg->range_min);
798 goto err_range;
799 }
800
801 if (range_cfg->range_max > map->max_register) {
802 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
803 range_cfg->range_max, map->max_register);
804 goto err_range;
805 }
806
807 if (range_cfg->selector_reg > map->max_register) {
808 dev_err(map->dev,
809 "Invalid range %d: selector out of map\n", i);
810 goto err_range;
811 }
812
813 if (range_cfg->window_len == 0) {
814 dev_err(map->dev, "Invalid range %d: window_len 0\n",
815 i);
816 goto err_range;
817 }
818
819 /* Make sure, that this register range has no selector
820 or data window within its boundary */
821 for (j = 0; j < config->num_ranges; j++) {
822 unsigned sel_reg = config->ranges[j].selector_reg;
823 unsigned win_min = config->ranges[j].window_start;
824 unsigned win_max = win_min +
825 config->ranges[j].window_len - 1;
826
827 /* Allow data window inside its own virtual range */
828 if (j == i)
829 continue;
830
831 if (range_cfg->range_min <= sel_reg &&
832 sel_reg <= range_cfg->range_max) {
833 dev_err(map->dev,
834 "Range %d: selector for %d in window\n",
835 i, j);
836 goto err_range;
837 }
838
839 if (!(win_max < range_cfg->range_min ||
840 win_min > range_cfg->range_max)) {
841 dev_err(map->dev,
842 "Range %d: window for %d in window\n",
843 i, j);
844 goto err_range;
845 }
846 }
847
848 new = kzalloc(sizeof(*new), GFP_KERNEL);
849 if (new == NULL) {
850 ret = -ENOMEM;
851 goto err_range;
852 }
853
854 new->map = map;
855 new->name = range_cfg->name;
856 new->range_min = range_cfg->range_min;
857 new->range_max = range_cfg->range_max;
858 new->selector_reg = range_cfg->selector_reg;
859 new->selector_mask = range_cfg->selector_mask;
860 new->selector_shift = range_cfg->selector_shift;
861 new->window_start = range_cfg->window_start;
862 new->window_len = range_cfg->window_len;
863
864 if (!_regmap_range_add(map, new)) {
865 dev_err(map->dev, "Failed to add range %d\n", i);
866 kfree(new);
867 goto err_range;
868 }
869
870 if (map->selector_work_buf == NULL) {
871 map->selector_work_buf =
872 kzalloc(map->format.buf_size, GFP_KERNEL);
873 if (map->selector_work_buf == NULL) {
874 ret = -ENOMEM;
875 goto err_range;
876 }
877 }
878 }
879
880 ret = regcache_init(map, config);
881 if (ret != 0)
882 goto err_range;
883
884 if (dev) {
885 ret = regmap_attach_dev(dev, map, config);
886 if (ret != 0)
887 goto err_regcache;
888 }
889
890 return map;
891
892 err_regcache:
893 regcache_exit(map);
894 err_range:
895 regmap_range_exit(map);
896 kfree(map->work_buf);
897 err_map:
898 kfree(map);
899 err:
900 return ERR_PTR(ret);
901 }
902 EXPORT_SYMBOL_GPL(regmap_init);
903
904 static void devm_regmap_release(struct device *dev, void *res)
905 {
906 regmap_exit(*(struct regmap **)res);
907 }
908
909 /**
910 * devm_regmap_init(): Initialise managed register map
911 *
912 * @dev: Device that will be interacted with
913 * @bus: Bus-specific callbacks to use with device
914 * @bus_context: Data passed to bus-specific callbacks
915 * @config: Configuration for register map
916 *
917 * The return value will be an ERR_PTR() on error or a valid pointer
918 * to a struct regmap. This function should generally not be called
919 * directly, it should be called by bus-specific init functions. The
920 * map will be automatically freed by the device management code.
921 */
922 struct regmap *devm_regmap_init(struct device *dev,
923 const struct regmap_bus *bus,
924 void *bus_context,
925 const struct regmap_config *config)
926 {
927 struct regmap **ptr, *regmap;
928
929 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
930 if (!ptr)
931 return ERR_PTR(-ENOMEM);
932
933 regmap = regmap_init(dev, bus, bus_context, config);
934 if (!IS_ERR(regmap)) {
935 *ptr = regmap;
936 devres_add(dev, ptr);
937 } else {
938 devres_free(ptr);
939 }
940
941 return regmap;
942 }
943 EXPORT_SYMBOL_GPL(devm_regmap_init);
944
945 static void regmap_field_init(struct regmap_field *rm_field,
946 struct regmap *regmap, struct reg_field reg_field)
947 {
948 int field_bits = reg_field.msb - reg_field.lsb + 1;
949 rm_field->regmap = regmap;
950 rm_field->reg = reg_field.reg;
951 rm_field->shift = reg_field.lsb;
952 rm_field->mask = ((BIT(field_bits) - 1) << reg_field.lsb);
953 rm_field->id_size = reg_field.id_size;
954 rm_field->id_offset = reg_field.id_offset;
955 }
956
957 /**
958 * devm_regmap_field_alloc(): Allocate and initialise a register field
959 * in a register map.
960 *
961 * @dev: Device that will be interacted with
962 * @regmap: regmap bank in which this register field is located.
963 * @reg_field: Register field with in the bank.
964 *
965 * The return value will be an ERR_PTR() on error or a valid pointer
966 * to a struct regmap_field. The regmap_field will be automatically freed
967 * by the device management code.
968 */
969 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
970 struct regmap *regmap, struct reg_field reg_field)
971 {
972 struct regmap_field *rm_field = devm_kzalloc(dev,
973 sizeof(*rm_field), GFP_KERNEL);
974 if (!rm_field)
975 return ERR_PTR(-ENOMEM);
976
977 regmap_field_init(rm_field, regmap, reg_field);
978
979 return rm_field;
980
981 }
982 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
983
984 /**
985 * devm_regmap_field_free(): Free register field allocated using
986 * devm_regmap_field_alloc. Usally drivers need not call this function,
987 * as the memory allocated via devm will be freed as per device-driver
988 * life-cyle.
989 *
990 * @dev: Device that will be interacted with
991 * @field: regmap field which should be freed.
992 */
993 void devm_regmap_field_free(struct device *dev,
994 struct regmap_field *field)
995 {
996 devm_kfree(dev, field);
997 }
998 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
999
1000 /**
1001 * regmap_field_alloc(): Allocate and initialise a register field
1002 * in a register map.
1003 *
1004 * @regmap: regmap bank in which this register field is located.
1005 * @reg_field: Register field with in the bank.
1006 *
1007 * The return value will be an ERR_PTR() on error or a valid pointer
1008 * to a struct regmap_field. The regmap_field should be freed by the
1009 * user once its finished working with it using regmap_field_free().
1010 */
1011 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1012 struct reg_field reg_field)
1013 {
1014 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1015
1016 if (!rm_field)
1017 return ERR_PTR(-ENOMEM);
1018
1019 regmap_field_init(rm_field, regmap, reg_field);
1020
1021 return rm_field;
1022 }
1023 EXPORT_SYMBOL_GPL(regmap_field_alloc);
1024
1025 /**
1026 * regmap_field_free(): Free register field allocated using regmap_field_alloc
1027 *
1028 * @field: regmap field which should be freed.
1029 */
1030 void regmap_field_free(struct regmap_field *field)
1031 {
1032 kfree(field);
1033 }
1034 EXPORT_SYMBOL_GPL(regmap_field_free);
1035
1036 /**
1037 * regmap_reinit_cache(): Reinitialise the current register cache
1038 *
1039 * @map: Register map to operate on.
1040 * @config: New configuration. Only the cache data will be used.
1041 *
1042 * Discard any existing register cache for the map and initialize a
1043 * new cache. This can be used to restore the cache to defaults or to
1044 * update the cache configuration to reflect runtime discovery of the
1045 * hardware.
1046 *
1047 * No explicit locking is done here, the user needs to ensure that
1048 * this function will not race with other calls to regmap.
1049 */
1050 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1051 {
1052 regcache_exit(map);
1053 regmap_debugfs_exit(map);
1054
1055 map->max_register = config->max_register;
1056 map->writeable_reg = config->writeable_reg;
1057 map->readable_reg = config->readable_reg;
1058 map->volatile_reg = config->volatile_reg;
1059 map->precious_reg = config->precious_reg;
1060 map->cache_type = config->cache_type;
1061
1062 regmap_debugfs_init(map, config->name);
1063
1064 map->cache_bypass = false;
1065 map->cache_only = false;
1066
1067 return regcache_init(map, config);
1068 }
1069 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1070
1071 /**
1072 * regmap_exit(): Free a previously allocated register map
1073 */
1074 void regmap_exit(struct regmap *map)
1075 {
1076 struct regmap_async *async;
1077
1078 regcache_exit(map);
1079 regmap_debugfs_exit(map);
1080 regmap_range_exit(map);
1081 if (map->bus && map->bus->free_context)
1082 map->bus->free_context(map->bus_context);
1083 kfree(map->work_buf);
1084 while (!list_empty(&map->async_free)) {
1085 async = list_first_entry_or_null(&map->async_free,
1086 struct regmap_async,
1087 list);
1088 list_del(&async->list);
1089 kfree(async->work_buf);
1090 kfree(async);
1091 }
1092 kfree(map);
1093 }
1094 EXPORT_SYMBOL_GPL(regmap_exit);
1095
1096 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1097 {
1098 struct regmap **r = res;
1099 if (!r || !*r) {
1100 WARN_ON(!r || !*r);
1101 return 0;
1102 }
1103
1104 /* If the user didn't specify a name match any */
1105 if (data)
1106 return (*r)->name == data;
1107 else
1108 return 1;
1109 }
1110
1111 /**
1112 * dev_get_regmap(): Obtain the regmap (if any) for a device
1113 *
1114 * @dev: Device to retrieve the map for
1115 * @name: Optional name for the register map, usually NULL.
1116 *
1117 * Returns the regmap for the device if one is present, or NULL. If
1118 * name is specified then it must match the name specified when
1119 * registering the device, if it is NULL then the first regmap found
1120 * will be used. Devices with multiple register maps are very rare,
1121 * generic code should normally not need to specify a name.
1122 */
1123 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1124 {
1125 struct regmap **r = devres_find(dev, dev_get_regmap_release,
1126 dev_get_regmap_match, (void *)name);
1127
1128 if (!r)
1129 return NULL;
1130 return *r;
1131 }
1132 EXPORT_SYMBOL_GPL(dev_get_regmap);
1133
1134 /**
1135 * regmap_get_device(): Obtain the device from a regmap
1136 *
1137 * @map: Register map to operate on.
1138 *
1139 * Returns the underlying device that the regmap has been created for.
1140 */
1141 struct device *regmap_get_device(struct regmap *map)
1142 {
1143 return map->dev;
1144 }
1145 EXPORT_SYMBOL_GPL(regmap_get_device);
1146
1147 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1148 struct regmap_range_node *range,
1149 unsigned int val_num)
1150 {
1151 void *orig_work_buf;
1152 unsigned int win_offset;
1153 unsigned int win_page;
1154 bool page_chg;
1155 int ret;
1156
1157 win_offset = (*reg - range->range_min) % range->window_len;
1158 win_page = (*reg - range->range_min) / range->window_len;
1159
1160 if (val_num > 1) {
1161 /* Bulk write shouldn't cross range boundary */
1162 if (*reg + val_num - 1 > range->range_max)
1163 return -EINVAL;
1164
1165 /* ... or single page boundary */
1166 if (val_num > range->window_len - win_offset)
1167 return -EINVAL;
1168 }
1169
1170 /* It is possible to have selector register inside data window.
1171 In that case, selector register is located on every page and
1172 it needs no page switching, when accessed alone. */
1173 if (val_num > 1 ||
1174 range->window_start + win_offset != range->selector_reg) {
1175 /* Use separate work_buf during page switching */
1176 orig_work_buf = map->work_buf;
1177 map->work_buf = map->selector_work_buf;
1178
1179 ret = _regmap_update_bits(map, range->selector_reg,
1180 range->selector_mask,
1181 win_page << range->selector_shift,
1182 &page_chg);
1183
1184 map->work_buf = orig_work_buf;
1185
1186 if (ret != 0)
1187 return ret;
1188 }
1189
1190 *reg = range->window_start + win_offset;
1191
1192 return 0;
1193 }
1194
1195 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1196 const void *val, size_t val_len)
1197 {
1198 struct regmap_range_node *range;
1199 unsigned long flags;
1200 u8 *u8 = map->work_buf;
1201 void *work_val = map->work_buf + map->format.reg_bytes +
1202 map->format.pad_bytes;
1203 void *buf;
1204 int ret = -ENOTSUPP;
1205 size_t len;
1206 int i;
1207
1208 WARN_ON(!map->bus);
1209
1210 /* Check for unwritable registers before we start */
1211 if (map->writeable_reg)
1212 for (i = 0; i < val_len / map->format.val_bytes; i++)
1213 if (!map->writeable_reg(map->dev,
1214 reg + (i * map->reg_stride)))
1215 return -EINVAL;
1216
1217 if (!map->cache_bypass && map->format.parse_val) {
1218 unsigned int ival;
1219 int val_bytes = map->format.val_bytes;
1220 for (i = 0; i < val_len / val_bytes; i++) {
1221 ival = map->format.parse_val(val + (i * val_bytes));
1222 ret = regcache_write(map, reg + (i * map->reg_stride),
1223 ival);
1224 if (ret) {
1225 dev_err(map->dev,
1226 "Error in caching of register: %x ret: %d\n",
1227 reg + i, ret);
1228 return ret;
1229 }
1230 }
1231 if (map->cache_only) {
1232 map->cache_dirty = true;
1233 return 0;
1234 }
1235 }
1236
1237 range = _regmap_range_lookup(map, reg);
1238 if (range) {
1239 int val_num = val_len / map->format.val_bytes;
1240 int win_offset = (reg - range->range_min) % range->window_len;
1241 int win_residue = range->window_len - win_offset;
1242
1243 /* If the write goes beyond the end of the window split it */
1244 while (val_num > win_residue) {
1245 dev_dbg(map->dev, "Writing window %d/%zu\n",
1246 win_residue, val_len / map->format.val_bytes);
1247 ret = _regmap_raw_write(map, reg, val, win_residue *
1248 map->format.val_bytes);
1249 if (ret != 0)
1250 return ret;
1251
1252 reg += win_residue;
1253 val_num -= win_residue;
1254 val += win_residue * map->format.val_bytes;
1255 val_len -= win_residue * map->format.val_bytes;
1256
1257 win_offset = (reg - range->range_min) %
1258 range->window_len;
1259 win_residue = range->window_len - win_offset;
1260 }
1261
1262 ret = _regmap_select_page(map, &reg, range, val_num);
1263 if (ret != 0)
1264 return ret;
1265 }
1266
1267 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1268
1269 u8[0] |= map->write_flag_mask;
1270
1271 /*
1272 * Essentially all I/O mechanisms will be faster with a single
1273 * buffer to write. Since register syncs often generate raw
1274 * writes of single registers optimise that case.
1275 */
1276 if (val != work_val && val_len == map->format.val_bytes) {
1277 memcpy(work_val, val, map->format.val_bytes);
1278 val = work_val;
1279 }
1280
1281 if (map->async && map->bus->async_write) {
1282 struct regmap_async *async;
1283
1284 trace_regmap_async_write_start(map, reg, val_len);
1285
1286 spin_lock_irqsave(&map->async_lock, flags);
1287 async = list_first_entry_or_null(&map->async_free,
1288 struct regmap_async,
1289 list);
1290 if (async)
1291 list_del(&async->list);
1292 spin_unlock_irqrestore(&map->async_lock, flags);
1293
1294 if (!async) {
1295 async = map->bus->async_alloc();
1296 if (!async)
1297 return -ENOMEM;
1298
1299 async->work_buf = kzalloc(map->format.buf_size,
1300 GFP_KERNEL | GFP_DMA);
1301 if (!async->work_buf) {
1302 kfree(async);
1303 return -ENOMEM;
1304 }
1305 }
1306
1307 async->map = map;
1308
1309 /* If the caller supplied the value we can use it safely. */
1310 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1311 map->format.reg_bytes + map->format.val_bytes);
1312
1313 spin_lock_irqsave(&map->async_lock, flags);
1314 list_add_tail(&async->list, &map->async_list);
1315 spin_unlock_irqrestore(&map->async_lock, flags);
1316
1317 if (val != work_val)
1318 ret = map->bus->async_write(map->bus_context,
1319 async->work_buf,
1320 map->format.reg_bytes +
1321 map->format.pad_bytes,
1322 val, val_len, async);
1323 else
1324 ret = map->bus->async_write(map->bus_context,
1325 async->work_buf,
1326 map->format.reg_bytes +
1327 map->format.pad_bytes +
1328 val_len, NULL, 0, async);
1329
1330 if (ret != 0) {
1331 dev_err(map->dev, "Failed to schedule write: %d\n",
1332 ret);
1333
1334 spin_lock_irqsave(&map->async_lock, flags);
1335 list_move(&async->list, &map->async_free);
1336 spin_unlock_irqrestore(&map->async_lock, flags);
1337 }
1338
1339 return ret;
1340 }
1341
1342 trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1343
1344 /* If we're doing a single register write we can probably just
1345 * send the work_buf directly, otherwise try to do a gather
1346 * write.
1347 */
1348 if (val == work_val)
1349 ret = map->bus->write(map->bus_context, map->work_buf,
1350 map->format.reg_bytes +
1351 map->format.pad_bytes +
1352 val_len);
1353 else if (map->bus->gather_write)
1354 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1355 map->format.reg_bytes +
1356 map->format.pad_bytes,
1357 val, val_len);
1358
1359 /* If that didn't work fall back on linearising by hand. */
1360 if (ret == -ENOTSUPP) {
1361 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1362 buf = kzalloc(len, GFP_KERNEL);
1363 if (!buf)
1364 return -ENOMEM;
1365
1366 memcpy(buf, map->work_buf, map->format.reg_bytes);
1367 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1368 val, val_len);
1369 ret = map->bus->write(map->bus_context, buf, len);
1370
1371 kfree(buf);
1372 }
1373
1374 trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1375
1376 return ret;
1377 }
1378
1379 /**
1380 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1381 *
1382 * @map: Map to check.
1383 */
1384 bool regmap_can_raw_write(struct regmap *map)
1385 {
1386 return map->bus && map->format.format_val && map->format.format_reg;
1387 }
1388 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1389
1390 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1391 unsigned int val)
1392 {
1393 int ret;
1394 struct regmap_range_node *range;
1395 struct regmap *map = context;
1396
1397 WARN_ON(!map->bus || !map->format.format_write);
1398
1399 range = _regmap_range_lookup(map, reg);
1400 if (range) {
1401 ret = _regmap_select_page(map, &reg, range, 1);
1402 if (ret != 0)
1403 return ret;
1404 }
1405
1406 map->format.format_write(map, reg, val);
1407
1408 trace_regmap_hw_write_start(map, reg, 1);
1409
1410 ret = map->bus->write(map->bus_context, map->work_buf,
1411 map->format.buf_size);
1412
1413 trace_regmap_hw_write_done(map, reg, 1);
1414
1415 return ret;
1416 }
1417
1418 static int _regmap_bus_reg_write(void *context, unsigned int reg,
1419 unsigned int val)
1420 {
1421 struct regmap *map = context;
1422
1423 return map->bus->reg_write(map->bus_context, reg, val);
1424 }
1425
1426 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1427 unsigned int val)
1428 {
1429 struct regmap *map = context;
1430
1431 WARN_ON(!map->bus || !map->format.format_val);
1432
1433 map->format.format_val(map->work_buf + map->format.reg_bytes
1434 + map->format.pad_bytes, val, 0);
1435 return _regmap_raw_write(map, reg,
1436 map->work_buf +
1437 map->format.reg_bytes +
1438 map->format.pad_bytes,
1439 map->format.val_bytes);
1440 }
1441
1442 static inline void *_regmap_map_get_context(struct regmap *map)
1443 {
1444 return (map->bus) ? map : map->bus_context;
1445 }
1446
1447 int _regmap_write(struct regmap *map, unsigned int reg,
1448 unsigned int val)
1449 {
1450 int ret;
1451 void *context = _regmap_map_get_context(map);
1452
1453 if (!regmap_writeable(map, reg))
1454 return -EIO;
1455
1456 if (!map->cache_bypass && !map->defer_caching) {
1457 ret = regcache_write(map, reg, val);
1458 if (ret != 0)
1459 return ret;
1460 if (map->cache_only) {
1461 map->cache_dirty = true;
1462 return 0;
1463 }
1464 }
1465
1466 #ifdef LOG_DEVICE
1467 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1468 dev_info(map->dev, "%x <= %x\n", reg, val);
1469 #endif
1470
1471 trace_regmap_reg_write(map, reg, val);
1472
1473 return map->reg_write(context, reg, val);
1474 }
1475
1476 /**
1477 * regmap_write(): Write a value to a single register
1478 *
1479 * @map: Register map to write to
1480 * @reg: Register to write to
1481 * @val: Value to be written
1482 *
1483 * A value of zero will be returned on success, a negative errno will
1484 * be returned in error cases.
1485 */
1486 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1487 {
1488 int ret;
1489
1490 if (reg % map->reg_stride)
1491 return -EINVAL;
1492
1493 map->lock(map->lock_arg);
1494
1495 ret = _regmap_write(map, reg, val);
1496
1497 map->unlock(map->lock_arg);
1498
1499 return ret;
1500 }
1501 EXPORT_SYMBOL_GPL(regmap_write);
1502
1503 /**
1504 * regmap_write_async(): Write a value to a single register asynchronously
1505 *
1506 * @map: Register map to write to
1507 * @reg: Register to write to
1508 * @val: Value to be written
1509 *
1510 * A value of zero will be returned on success, a negative errno will
1511 * be returned in error cases.
1512 */
1513 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1514 {
1515 int ret;
1516
1517 if (reg % map->reg_stride)
1518 return -EINVAL;
1519
1520 map->lock(map->lock_arg);
1521
1522 map->async = true;
1523
1524 ret = _regmap_write(map, reg, val);
1525
1526 map->async = false;
1527
1528 map->unlock(map->lock_arg);
1529
1530 return ret;
1531 }
1532 EXPORT_SYMBOL_GPL(regmap_write_async);
1533
1534 /**
1535 * regmap_raw_write(): Write raw values to one or more registers
1536 *
1537 * @map: Register map to write to
1538 * @reg: Initial register to write to
1539 * @val: Block of data to be written, laid out for direct transmission to the
1540 * device
1541 * @val_len: Length of data pointed to by val.
1542 *
1543 * This function is intended to be used for things like firmware
1544 * download where a large block of data needs to be transferred to the
1545 * device. No formatting will be done on the data provided.
1546 *
1547 * A value of zero will be returned on success, a negative errno will
1548 * be returned in error cases.
1549 */
1550 int regmap_raw_write(struct regmap *map, unsigned int reg,
1551 const void *val, size_t val_len)
1552 {
1553 int ret;
1554
1555 if (!regmap_can_raw_write(map))
1556 return -EINVAL;
1557 if (val_len % map->format.val_bytes)
1558 return -EINVAL;
1559
1560 map->lock(map->lock_arg);
1561
1562 ret = _regmap_raw_write(map, reg, val, val_len);
1563
1564 map->unlock(map->lock_arg);
1565
1566 return ret;
1567 }
1568 EXPORT_SYMBOL_GPL(regmap_raw_write);
1569
1570 /**
1571 * regmap_field_write(): Write a value to a single register field
1572 *
1573 * @field: Register field to write to
1574 * @val: Value to be written
1575 *
1576 * A value of zero will be returned on success, a negative errno will
1577 * be returned in error cases.
1578 */
1579 int regmap_field_write(struct regmap_field *field, unsigned int val)
1580 {
1581 return regmap_update_bits(field->regmap, field->reg,
1582 field->mask, val << field->shift);
1583 }
1584 EXPORT_SYMBOL_GPL(regmap_field_write);
1585
1586 /**
1587 * regmap_field_update_bits(): Perform a read/modify/write cycle
1588 * on the register field
1589 *
1590 * @field: Register field to write to
1591 * @mask: Bitmask to change
1592 * @val: Value to be written
1593 *
1594 * A value of zero will be returned on success, a negative errno will
1595 * be returned in error cases.
1596 */
1597 int regmap_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
1598 {
1599 mask = (mask << field->shift) & field->mask;
1600
1601 return regmap_update_bits(field->regmap, field->reg,
1602 mask, val << field->shift);
1603 }
1604 EXPORT_SYMBOL_GPL(regmap_field_update_bits);
1605
1606 /**
1607 * regmap_fields_write(): Write a value to a single register field with port ID
1608 *
1609 * @field: Register field to write to
1610 * @id: port ID
1611 * @val: Value to be written
1612 *
1613 * A value of zero will be returned on success, a negative errno will
1614 * be returned in error cases.
1615 */
1616 int regmap_fields_write(struct regmap_field *field, unsigned int id,
1617 unsigned int val)
1618 {
1619 if (id >= field->id_size)
1620 return -EINVAL;
1621
1622 return regmap_update_bits(field->regmap,
1623 field->reg + (field->id_offset * id),
1624 field->mask, val << field->shift);
1625 }
1626 EXPORT_SYMBOL_GPL(regmap_fields_write);
1627
1628 /**
1629 * regmap_fields_update_bits(): Perform a read/modify/write cycle
1630 * on the register field
1631 *
1632 * @field: Register field to write to
1633 * @id: port ID
1634 * @mask: Bitmask to change
1635 * @val: Value to be written
1636 *
1637 * A value of zero will be returned on success, a negative errno will
1638 * be returned in error cases.
1639 */
1640 int regmap_fields_update_bits(struct regmap_field *field, unsigned int id,
1641 unsigned int mask, unsigned int val)
1642 {
1643 if (id >= field->id_size)
1644 return -EINVAL;
1645
1646 mask = (mask << field->shift) & field->mask;
1647
1648 return regmap_update_bits(field->regmap,
1649 field->reg + (field->id_offset * id),
1650 mask, val << field->shift);
1651 }
1652 EXPORT_SYMBOL_GPL(regmap_fields_update_bits);
1653
1654 /*
1655 * regmap_bulk_write(): Write multiple registers to the device
1656 *
1657 * @map: Register map to write to
1658 * @reg: First register to be write from
1659 * @val: Block of data to be written, in native register size for device
1660 * @val_count: Number of registers to write
1661 *
1662 * This function is intended to be used for writing a large block of
1663 * data to the device either in single transfer or multiple transfer.
1664 *
1665 * A value of zero will be returned on success, a negative errno will
1666 * be returned in error cases.
1667 */
1668 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1669 size_t val_count)
1670 {
1671 int ret = 0, i;
1672 size_t val_bytes = map->format.val_bytes;
1673
1674 if (map->bus && !map->format.parse_inplace)
1675 return -EINVAL;
1676 if (reg % map->reg_stride)
1677 return -EINVAL;
1678
1679 /*
1680 * Some devices don't support bulk write, for
1681 * them we have a series of single write operations.
1682 */
1683 if (!map->bus || map->use_single_rw) {
1684 map->lock(map->lock_arg);
1685 for (i = 0; i < val_count; i++) {
1686 unsigned int ival;
1687
1688 switch (val_bytes) {
1689 case 1:
1690 ival = *(u8 *)(val + (i * val_bytes));
1691 break;
1692 case 2:
1693 ival = *(u16 *)(val + (i * val_bytes));
1694 break;
1695 case 4:
1696 ival = *(u32 *)(val + (i * val_bytes));
1697 break;
1698 #ifdef CONFIG_64BIT
1699 case 8:
1700 ival = *(u64 *)(val + (i * val_bytes));
1701 break;
1702 #endif
1703 default:
1704 ret = -EINVAL;
1705 goto out;
1706 }
1707
1708 ret = _regmap_write(map, reg + (i * map->reg_stride),
1709 ival);
1710 if (ret != 0)
1711 goto out;
1712 }
1713 out:
1714 map->unlock(map->lock_arg);
1715 } else {
1716 void *wval;
1717
1718 if (!val_count)
1719 return -EINVAL;
1720
1721 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
1722 if (!wval) {
1723 dev_err(map->dev, "Error in memory allocation\n");
1724 return -ENOMEM;
1725 }
1726 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1727 map->format.parse_inplace(wval + i);
1728
1729 map->lock(map->lock_arg);
1730 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1731 map->unlock(map->lock_arg);
1732
1733 kfree(wval);
1734 }
1735 return ret;
1736 }
1737 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1738
1739 /*
1740 * _regmap_raw_multi_reg_write()
1741 *
1742 * the (register,newvalue) pairs in regs have not been formatted, but
1743 * they are all in the same page and have been changed to being page
1744 * relative. The page register has been written if that was neccessary.
1745 */
1746 static int _regmap_raw_multi_reg_write(struct regmap *map,
1747 const struct reg_default *regs,
1748 size_t num_regs)
1749 {
1750 int ret;
1751 void *buf;
1752 int i;
1753 u8 *u8;
1754 size_t val_bytes = map->format.val_bytes;
1755 size_t reg_bytes = map->format.reg_bytes;
1756 size_t pad_bytes = map->format.pad_bytes;
1757 size_t pair_size = reg_bytes + pad_bytes + val_bytes;
1758 size_t len = pair_size * num_regs;
1759
1760 if (!len)
1761 return -EINVAL;
1762
1763 buf = kzalloc(len, GFP_KERNEL);
1764 if (!buf)
1765 return -ENOMEM;
1766
1767 /* We have to linearise by hand. */
1768
1769 u8 = buf;
1770
1771 for (i = 0; i < num_regs; i++) {
1772 int reg = regs[i].reg;
1773 int val = regs[i].def;
1774 trace_regmap_hw_write_start(map, reg, 1);
1775 map->format.format_reg(u8, reg, map->reg_shift);
1776 u8 += reg_bytes + pad_bytes;
1777 map->format.format_val(u8, val, 0);
1778 u8 += val_bytes;
1779 }
1780 u8 = buf;
1781 *u8 |= map->write_flag_mask;
1782
1783 ret = map->bus->write(map->bus_context, buf, len);
1784
1785 kfree(buf);
1786
1787 for (i = 0; i < num_regs; i++) {
1788 int reg = regs[i].reg;
1789 trace_regmap_hw_write_done(map, reg, 1);
1790 }
1791 return ret;
1792 }
1793
1794 static unsigned int _regmap_register_page(struct regmap *map,
1795 unsigned int reg,
1796 struct regmap_range_node *range)
1797 {
1798 unsigned int win_page = (reg - range->range_min) / range->window_len;
1799
1800 return win_page;
1801 }
1802
1803 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
1804 struct reg_default *regs,
1805 size_t num_regs)
1806 {
1807 int ret;
1808 int i, n;
1809 struct reg_default *base;
1810 unsigned int this_page = 0;
1811 /*
1812 * the set of registers are not neccessarily in order, but
1813 * since the order of write must be preserved this algorithm
1814 * chops the set each time the page changes
1815 */
1816 base = regs;
1817 for (i = 0, n = 0; i < num_regs; i++, n++) {
1818 unsigned int reg = regs[i].reg;
1819 struct regmap_range_node *range;
1820
1821 range = _regmap_range_lookup(map, reg);
1822 if (range) {
1823 unsigned int win_page = _regmap_register_page(map, reg,
1824 range);
1825
1826 if (i == 0)
1827 this_page = win_page;
1828 if (win_page != this_page) {
1829 this_page = win_page;
1830 ret = _regmap_raw_multi_reg_write(map, base, n);
1831 if (ret != 0)
1832 return ret;
1833 base += n;
1834 n = 0;
1835 }
1836 ret = _regmap_select_page(map, &base[n].reg, range, 1);
1837 if (ret != 0)
1838 return ret;
1839 }
1840 }
1841 if (n > 0)
1842 return _regmap_raw_multi_reg_write(map, base, n);
1843 return 0;
1844 }
1845
1846 static int _regmap_multi_reg_write(struct regmap *map,
1847 const struct reg_default *regs,
1848 size_t num_regs)
1849 {
1850 int i;
1851 int ret;
1852
1853 if (!map->can_multi_write) {
1854 for (i = 0; i < num_regs; i++) {
1855 ret = _regmap_write(map, regs[i].reg, regs[i].def);
1856 if (ret != 0)
1857 return ret;
1858 }
1859 return 0;
1860 }
1861
1862 if (!map->format.parse_inplace)
1863 return -EINVAL;
1864
1865 if (map->writeable_reg)
1866 for (i = 0; i < num_regs; i++) {
1867 int reg = regs[i].reg;
1868 if (!map->writeable_reg(map->dev, reg))
1869 return -EINVAL;
1870 if (reg % map->reg_stride)
1871 return -EINVAL;
1872 }
1873
1874 if (!map->cache_bypass) {
1875 for (i = 0; i < num_regs; i++) {
1876 unsigned int val = regs[i].def;
1877 unsigned int reg = regs[i].reg;
1878 ret = regcache_write(map, reg, val);
1879 if (ret) {
1880 dev_err(map->dev,
1881 "Error in caching of register: %x ret: %d\n",
1882 reg, ret);
1883 return ret;
1884 }
1885 }
1886 if (map->cache_only) {
1887 map->cache_dirty = true;
1888 return 0;
1889 }
1890 }
1891
1892 WARN_ON(!map->bus);
1893
1894 for (i = 0; i < num_regs; i++) {
1895 unsigned int reg = regs[i].reg;
1896 struct regmap_range_node *range;
1897 range = _regmap_range_lookup(map, reg);
1898 if (range) {
1899 size_t len = sizeof(struct reg_default)*num_regs;
1900 struct reg_default *base = kmemdup(regs, len,
1901 GFP_KERNEL);
1902 if (!base)
1903 return -ENOMEM;
1904 ret = _regmap_range_multi_paged_reg_write(map, base,
1905 num_regs);
1906 kfree(base);
1907
1908 return ret;
1909 }
1910 }
1911 return _regmap_raw_multi_reg_write(map, regs, num_regs);
1912 }
1913
1914 /*
1915 * regmap_multi_reg_write(): Write multiple registers to the device
1916 *
1917 * where the set of register,value pairs are supplied in any order,
1918 * possibly not all in a single range.
1919 *
1920 * @map: Register map to write to
1921 * @regs: Array of structures containing register,value to be written
1922 * @num_regs: Number of registers to write
1923 *
1924 * The 'normal' block write mode will send ultimately send data on the
1925 * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
1926 * addressed. However, this alternative block multi write mode will send
1927 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
1928 * must of course support the mode.
1929 *
1930 * A value of zero will be returned on success, a negative errno will be
1931 * returned in error cases.
1932 */
1933 int regmap_multi_reg_write(struct regmap *map, const struct reg_default *regs,
1934 int num_regs)
1935 {
1936 int ret;
1937
1938 map->lock(map->lock_arg);
1939
1940 ret = _regmap_multi_reg_write(map, regs, num_regs);
1941
1942 map->unlock(map->lock_arg);
1943
1944 return ret;
1945 }
1946 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
1947
1948 /*
1949 * regmap_multi_reg_write_bypassed(): Write multiple registers to the
1950 * device but not the cache
1951 *
1952 * where the set of register are supplied in any order
1953 *
1954 * @map: Register map to write to
1955 * @regs: Array of structures containing register,value to be written
1956 * @num_regs: Number of registers to write
1957 *
1958 * This function is intended to be used for writing a large block of data
1959 * atomically to the device in single transfer for those I2C client devices
1960 * that implement this alternative block write mode.
1961 *
1962 * A value of zero will be returned on success, a negative errno will
1963 * be returned in error cases.
1964 */
1965 int regmap_multi_reg_write_bypassed(struct regmap *map,
1966 const struct reg_default *regs,
1967 int num_regs)
1968 {
1969 int ret;
1970 bool bypass;
1971
1972 map->lock(map->lock_arg);
1973
1974 bypass = map->cache_bypass;
1975 map->cache_bypass = true;
1976
1977 ret = _regmap_multi_reg_write(map, regs, num_regs);
1978
1979 map->cache_bypass = bypass;
1980
1981 map->unlock(map->lock_arg);
1982
1983 return ret;
1984 }
1985 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
1986
1987 /**
1988 * regmap_raw_write_async(): Write raw values to one or more registers
1989 * asynchronously
1990 *
1991 * @map: Register map to write to
1992 * @reg: Initial register to write to
1993 * @val: Block of data to be written, laid out for direct transmission to the
1994 * device. Must be valid until regmap_async_complete() is called.
1995 * @val_len: Length of data pointed to by val.
1996 *
1997 * This function is intended to be used for things like firmware
1998 * download where a large block of data needs to be transferred to the
1999 * device. No formatting will be done on the data provided.
2000 *
2001 * If supported by the underlying bus the write will be scheduled
2002 * asynchronously, helping maximise I/O speed on higher speed buses
2003 * like SPI. regmap_async_complete() can be called to ensure that all
2004 * asynchrnous writes have been completed.
2005 *
2006 * A value of zero will be returned on success, a negative errno will
2007 * be returned in error cases.
2008 */
2009 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2010 const void *val, size_t val_len)
2011 {
2012 int ret;
2013
2014 if (val_len % map->format.val_bytes)
2015 return -EINVAL;
2016 if (reg % map->reg_stride)
2017 return -EINVAL;
2018
2019 map->lock(map->lock_arg);
2020
2021 map->async = true;
2022
2023 ret = _regmap_raw_write(map, reg, val, val_len);
2024
2025 map->async = false;
2026
2027 map->unlock(map->lock_arg);
2028
2029 return ret;
2030 }
2031 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2032
2033 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2034 unsigned int val_len)
2035 {
2036 struct regmap_range_node *range;
2037 u8 *u8 = map->work_buf;
2038 int ret;
2039
2040 WARN_ON(!map->bus);
2041
2042 range = _regmap_range_lookup(map, reg);
2043 if (range) {
2044 ret = _regmap_select_page(map, &reg, range,
2045 val_len / map->format.val_bytes);
2046 if (ret != 0)
2047 return ret;
2048 }
2049
2050 map->format.format_reg(map->work_buf, reg, map->reg_shift);
2051
2052 /*
2053 * Some buses or devices flag reads by setting the high bits in the
2054 * register addresss; since it's always the high bits for all
2055 * current formats we can do this here rather than in
2056 * formatting. This may break if we get interesting formats.
2057 */
2058 u8[0] |= map->read_flag_mask;
2059
2060 trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2061
2062 ret = map->bus->read(map->bus_context, map->work_buf,
2063 map->format.reg_bytes + map->format.pad_bytes,
2064 val, val_len);
2065
2066 trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2067
2068 return ret;
2069 }
2070
2071 static int _regmap_bus_reg_read(void *context, unsigned int reg,
2072 unsigned int *val)
2073 {
2074 struct regmap *map = context;
2075
2076 return map->bus->reg_read(map->bus_context, reg, val);
2077 }
2078
2079 static int _regmap_bus_read(void *context, unsigned int reg,
2080 unsigned int *val)
2081 {
2082 int ret;
2083 struct regmap *map = context;
2084
2085 if (!map->format.parse_val)
2086 return -EINVAL;
2087
2088 ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
2089 if (ret == 0)
2090 *val = map->format.parse_val(map->work_buf);
2091
2092 return ret;
2093 }
2094
2095 static int _regmap_read(struct regmap *map, unsigned int reg,
2096 unsigned int *val)
2097 {
2098 int ret;
2099 void *context = _regmap_map_get_context(map);
2100
2101 WARN_ON(!map->reg_read);
2102
2103 if (!map->cache_bypass) {
2104 ret = regcache_read(map, reg, val);
2105 if (ret == 0)
2106 return 0;
2107 }
2108
2109 if (map->cache_only)
2110 return -EBUSY;
2111
2112 if (!regmap_readable(map, reg))
2113 return -EIO;
2114
2115 ret = map->reg_read(context, reg, val);
2116 if (ret == 0) {
2117 #ifdef LOG_DEVICE
2118 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2119 dev_info(map->dev, "%x => %x\n", reg, *val);
2120 #endif
2121
2122 trace_regmap_reg_read(map, reg, *val);
2123
2124 if (!map->cache_bypass)
2125 regcache_write(map, reg, *val);
2126 }
2127
2128 return ret;
2129 }
2130
2131 /**
2132 * regmap_read(): Read a value from a single register
2133 *
2134 * @map: Register map to read from
2135 * @reg: Register to be read from
2136 * @val: Pointer to store read value
2137 *
2138 * A value of zero will be returned on success, a negative errno will
2139 * be returned in error cases.
2140 */
2141 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2142 {
2143 int ret;
2144
2145 if (reg % map->reg_stride)
2146 return -EINVAL;
2147
2148 map->lock(map->lock_arg);
2149
2150 ret = _regmap_read(map, reg, val);
2151
2152 map->unlock(map->lock_arg);
2153
2154 return ret;
2155 }
2156 EXPORT_SYMBOL_GPL(regmap_read);
2157
2158 /**
2159 * regmap_raw_read(): Read raw data from the device
2160 *
2161 * @map: Register map to read from
2162 * @reg: First register to be read from
2163 * @val: Pointer to store read value
2164 * @val_len: Size of data to read
2165 *
2166 * A value of zero will be returned on success, a negative errno will
2167 * be returned in error cases.
2168 */
2169 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2170 size_t val_len)
2171 {
2172 size_t val_bytes = map->format.val_bytes;
2173 size_t val_count = val_len / val_bytes;
2174 unsigned int v;
2175 int ret, i;
2176
2177 if (!map->bus)
2178 return -EINVAL;
2179 if (val_len % map->format.val_bytes)
2180 return -EINVAL;
2181 if (reg % map->reg_stride)
2182 return -EINVAL;
2183
2184 map->lock(map->lock_arg);
2185
2186 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2187 map->cache_type == REGCACHE_NONE) {
2188 /* Physical block read if there's no cache involved */
2189 ret = _regmap_raw_read(map, reg, val, val_len);
2190
2191 } else {
2192 /* Otherwise go word by word for the cache; should be low
2193 * cost as we expect to hit the cache.
2194 */
2195 for (i = 0; i < val_count; i++) {
2196 ret = _regmap_read(map, reg + (i * map->reg_stride),
2197 &v);
2198 if (ret != 0)
2199 goto out;
2200
2201 map->format.format_val(val + (i * val_bytes), v, 0);
2202 }
2203 }
2204
2205 out:
2206 map->unlock(map->lock_arg);
2207
2208 return ret;
2209 }
2210 EXPORT_SYMBOL_GPL(regmap_raw_read);
2211
2212 /**
2213 * regmap_field_read(): Read a value to a single register field
2214 *
2215 * @field: Register field to read from
2216 * @val: Pointer to store read value
2217 *
2218 * A value of zero will be returned on success, a negative errno will
2219 * be returned in error cases.
2220 */
2221 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2222 {
2223 int ret;
2224 unsigned int reg_val;
2225 ret = regmap_read(field->regmap, field->reg, &reg_val);
2226 if (ret != 0)
2227 return ret;
2228
2229 reg_val &= field->mask;
2230 reg_val >>= field->shift;
2231 *val = reg_val;
2232
2233 return ret;
2234 }
2235 EXPORT_SYMBOL_GPL(regmap_field_read);
2236
2237 /**
2238 * regmap_fields_read(): Read a value to a single register field with port ID
2239 *
2240 * @field: Register field to read from
2241 * @id: port ID
2242 * @val: Pointer to store read value
2243 *
2244 * A value of zero will be returned on success, a negative errno will
2245 * be returned in error cases.
2246 */
2247 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2248 unsigned int *val)
2249 {
2250 int ret;
2251 unsigned int reg_val;
2252
2253 if (id >= field->id_size)
2254 return -EINVAL;
2255
2256 ret = regmap_read(field->regmap,
2257 field->reg + (field->id_offset * id),
2258 &reg_val);
2259 if (ret != 0)
2260 return ret;
2261
2262 reg_val &= field->mask;
2263 reg_val >>= field->shift;
2264 *val = reg_val;
2265
2266 return ret;
2267 }
2268 EXPORT_SYMBOL_GPL(regmap_fields_read);
2269
2270 /**
2271 * regmap_bulk_read(): Read multiple registers from the device
2272 *
2273 * @map: Register map to read from
2274 * @reg: First register to be read from
2275 * @val: Pointer to store read value, in native register size for device
2276 * @val_count: Number of registers to read
2277 *
2278 * A value of zero will be returned on success, a negative errno will
2279 * be returned in error cases.
2280 */
2281 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2282 size_t val_count)
2283 {
2284 int ret, i;
2285 size_t val_bytes = map->format.val_bytes;
2286 bool vol = regmap_volatile_range(map, reg, val_count);
2287
2288 if (reg % map->reg_stride)
2289 return -EINVAL;
2290
2291 if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2292 /*
2293 * Some devices does not support bulk read, for
2294 * them we have a series of single read operations.
2295 */
2296 if (map->use_single_rw) {
2297 for (i = 0; i < val_count; i++) {
2298 ret = regmap_raw_read(map,
2299 reg + (i * map->reg_stride),
2300 val + (i * val_bytes),
2301 val_bytes);
2302 if (ret != 0)
2303 return ret;
2304 }
2305 } else {
2306 ret = regmap_raw_read(map, reg, val,
2307 val_bytes * val_count);
2308 if (ret != 0)
2309 return ret;
2310 }
2311
2312 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2313 map->format.parse_inplace(val + i);
2314 } else {
2315 for (i = 0; i < val_count; i++) {
2316 unsigned int ival;
2317 ret = regmap_read(map, reg + (i * map->reg_stride),
2318 &ival);
2319 if (ret != 0)
2320 return ret;
2321 memcpy(val + (i * val_bytes), &ival, val_bytes);
2322 }
2323 }
2324
2325 return 0;
2326 }
2327 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2328
2329 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2330 unsigned int mask, unsigned int val,
2331 bool *change)
2332 {
2333 int ret;
2334 unsigned int tmp, orig;
2335
2336 ret = _regmap_read(map, reg, &orig);
2337 if (ret != 0)
2338 return ret;
2339
2340 tmp = orig & ~mask;
2341 tmp |= val & mask;
2342
2343 if (tmp != orig) {
2344 ret = _regmap_write(map, reg, tmp);
2345 if (change)
2346 *change = true;
2347 } else {
2348 if (change)
2349 *change = false;
2350 }
2351
2352 return ret;
2353 }
2354
2355 /**
2356 * regmap_update_bits: Perform a read/modify/write cycle on the register map
2357 *
2358 * @map: Register map to update
2359 * @reg: Register to update
2360 * @mask: Bitmask to change
2361 * @val: New value for bitmask
2362 *
2363 * Returns zero for success, a negative number on error.
2364 */
2365 int regmap_update_bits(struct regmap *map, unsigned int reg,
2366 unsigned int mask, unsigned int val)
2367 {
2368 int ret;
2369
2370 map->lock(map->lock_arg);
2371 ret = _regmap_update_bits(map, reg, mask, val, NULL);
2372 map->unlock(map->lock_arg);
2373
2374 return ret;
2375 }
2376 EXPORT_SYMBOL_GPL(regmap_update_bits);
2377
2378 /**
2379 * regmap_update_bits_async: Perform a read/modify/write cycle on the register
2380 * map asynchronously
2381 *
2382 * @map: Register map to update
2383 * @reg: Register to update
2384 * @mask: Bitmask to change
2385 * @val: New value for bitmask
2386 *
2387 * With most buses the read must be done synchronously so this is most
2388 * useful for devices with a cache which do not need to interact with
2389 * the hardware to determine the current register value.
2390 *
2391 * Returns zero for success, a negative number on error.
2392 */
2393 int regmap_update_bits_async(struct regmap *map, unsigned int reg,
2394 unsigned int mask, unsigned int val)
2395 {
2396 int ret;
2397
2398 map->lock(map->lock_arg);
2399
2400 map->async = true;
2401
2402 ret = _regmap_update_bits(map, reg, mask, val, NULL);
2403
2404 map->async = false;
2405
2406 map->unlock(map->lock_arg);
2407
2408 return ret;
2409 }
2410 EXPORT_SYMBOL_GPL(regmap_update_bits_async);
2411
2412 /**
2413 * regmap_update_bits_check: Perform a read/modify/write cycle on the
2414 * register map and report if updated
2415 *
2416 * @map: Register map to update
2417 * @reg: Register to update
2418 * @mask: Bitmask to change
2419 * @val: New value for bitmask
2420 * @change: Boolean indicating if a write was done
2421 *
2422 * Returns zero for success, a negative number on error.
2423 */
2424 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
2425 unsigned int mask, unsigned int val,
2426 bool *change)
2427 {
2428 int ret;
2429
2430 map->lock(map->lock_arg);
2431 ret = _regmap_update_bits(map, reg, mask, val, change);
2432 map->unlock(map->lock_arg);
2433 return ret;
2434 }
2435 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
2436
2437 /**
2438 * regmap_update_bits_check_async: Perform a read/modify/write cycle on the
2439 * register map asynchronously and report if
2440 * updated
2441 *
2442 * @map: Register map to update
2443 * @reg: Register to update
2444 * @mask: Bitmask to change
2445 * @val: New value for bitmask
2446 * @change: Boolean indicating if a write was done
2447 *
2448 * With most buses the read must be done synchronously so this is most
2449 * useful for devices with a cache which do not need to interact with
2450 * the hardware to determine the current register value.
2451 *
2452 * Returns zero for success, a negative number on error.
2453 */
2454 int regmap_update_bits_check_async(struct regmap *map, unsigned int reg,
2455 unsigned int mask, unsigned int val,
2456 bool *change)
2457 {
2458 int ret;
2459
2460 map->lock(map->lock_arg);
2461
2462 map->async = true;
2463
2464 ret = _regmap_update_bits(map, reg, mask, val, change);
2465
2466 map->async = false;
2467
2468 map->unlock(map->lock_arg);
2469
2470 return ret;
2471 }
2472 EXPORT_SYMBOL_GPL(regmap_update_bits_check_async);
2473
2474 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2475 {
2476 struct regmap *map = async->map;
2477 bool wake;
2478
2479 trace_regmap_async_io_complete(map);
2480
2481 spin_lock(&map->async_lock);
2482 list_move(&async->list, &map->async_free);
2483 wake = list_empty(&map->async_list);
2484
2485 if (ret != 0)
2486 map->async_ret = ret;
2487
2488 spin_unlock(&map->async_lock);
2489
2490 if (wake)
2491 wake_up(&map->async_waitq);
2492 }
2493 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2494
2495 static int regmap_async_is_done(struct regmap *map)
2496 {
2497 unsigned long flags;
2498 int ret;
2499
2500 spin_lock_irqsave(&map->async_lock, flags);
2501 ret = list_empty(&map->async_list);
2502 spin_unlock_irqrestore(&map->async_lock, flags);
2503
2504 return ret;
2505 }
2506
2507 /**
2508 * regmap_async_complete: Ensure all asynchronous I/O has completed.
2509 *
2510 * @map: Map to operate on.
2511 *
2512 * Blocks until any pending asynchronous I/O has completed. Returns
2513 * an error code for any failed I/O operations.
2514 */
2515 int regmap_async_complete(struct regmap *map)
2516 {
2517 unsigned long flags;
2518 int ret;
2519
2520 /* Nothing to do with no async support */
2521 if (!map->bus || !map->bus->async_write)
2522 return 0;
2523
2524 trace_regmap_async_complete_start(map);
2525
2526 wait_event(map->async_waitq, regmap_async_is_done(map));
2527
2528 spin_lock_irqsave(&map->async_lock, flags);
2529 ret = map->async_ret;
2530 map->async_ret = 0;
2531 spin_unlock_irqrestore(&map->async_lock, flags);
2532
2533 trace_regmap_async_complete_done(map);
2534
2535 return ret;
2536 }
2537 EXPORT_SYMBOL_GPL(regmap_async_complete);
2538
2539 /**
2540 * regmap_register_patch: Register and apply register updates to be applied
2541 * on device initialistion
2542 *
2543 * @map: Register map to apply updates to.
2544 * @regs: Values to update.
2545 * @num_regs: Number of entries in regs.
2546 *
2547 * Register a set of register updates to be applied to the device
2548 * whenever the device registers are synchronised with the cache and
2549 * apply them immediately. Typically this is used to apply
2550 * corrections to be applied to the device defaults on startup, such
2551 * as the updates some vendors provide to undocumented registers.
2552 *
2553 * The caller must ensure that this function cannot be called
2554 * concurrently with either itself or regcache_sync().
2555 */
2556 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
2557 int num_regs)
2558 {
2559 struct reg_default *p;
2560 int ret;
2561 bool bypass;
2562
2563 if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2564 num_regs))
2565 return 0;
2566
2567 p = krealloc(map->patch,
2568 sizeof(struct reg_default) * (map->patch_regs + num_regs),
2569 GFP_KERNEL);
2570 if (p) {
2571 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2572 map->patch = p;
2573 map->patch_regs += num_regs;
2574 } else {
2575 return -ENOMEM;
2576 }
2577
2578 map->lock(map->lock_arg);
2579
2580 bypass = map->cache_bypass;
2581
2582 map->cache_bypass = true;
2583 map->async = true;
2584
2585 ret = _regmap_multi_reg_write(map, regs, num_regs);
2586 if (ret != 0)
2587 goto out;
2588
2589 out:
2590 map->async = false;
2591 map->cache_bypass = bypass;
2592
2593 map->unlock(map->lock_arg);
2594
2595 regmap_async_complete(map);
2596
2597 return ret;
2598 }
2599 EXPORT_SYMBOL_GPL(regmap_register_patch);
2600
2601 /*
2602 * regmap_get_val_bytes(): Report the size of a register value
2603 *
2604 * Report the size of a register value, mainly intended to for use by
2605 * generic infrastructure built on top of regmap.
2606 */
2607 int regmap_get_val_bytes(struct regmap *map)
2608 {
2609 if (map->format.format_write)
2610 return -EINVAL;
2611
2612 return map->format.val_bytes;
2613 }
2614 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2615
2616 /**
2617 * regmap_get_max_register(): Report the max register value
2618 *
2619 * Report the max register value, mainly intended to for use by
2620 * generic infrastructure built on top of regmap.
2621 */
2622 int regmap_get_max_register(struct regmap *map)
2623 {
2624 return map->max_register ? map->max_register : -EINVAL;
2625 }
2626 EXPORT_SYMBOL_GPL(regmap_get_max_register);
2627
2628 int regmap_parse_val(struct regmap *map, const void *buf,
2629 unsigned int *val)
2630 {
2631 if (!map->format.parse_val)
2632 return -EINVAL;
2633
2634 *val = map->format.parse_val(buf);
2635
2636 return 0;
2637 }
2638 EXPORT_SYMBOL_GPL(regmap_parse_val);
2639
2640 static int __init regmap_initcall(void)
2641 {
2642 regmap_debugfs_initcall();
2643
2644 return 0;
2645 }
2646 postcore_initcall(regmap_initcall);
Linux kernel - Deliverables
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