1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Register map access API |
4 | // |
5 | // Copyright 2011 Wolfson Microelectronics plc |
6 | // |
7 | // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
8 | |
9 | #include <linux/device.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/export.h> |
12 | #include <linux/mutex.h> |
13 | #include <linux/err.h> |
14 | #include <linux/property.h> |
15 | #include <linux/rbtree.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/delay.h> |
18 | #include <linux/log2.h> |
19 | #include <linux/hwspinlock.h> |
20 | #include <asm/unaligned.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 | #ifdef LOG_DEVICE |
36 | static inline bool regmap_should_log(struct regmap *map) |
37 | { |
38 | return (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0); |
39 | } |
40 | #else |
41 | static inline bool regmap_should_log(struct regmap *map) { return false; } |
42 | #endif |
43 | |
44 | |
45 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
46 | unsigned int mask, unsigned int val, |
47 | bool *change, bool force_write); |
48 | |
49 | static int _regmap_bus_reg_read(void *context, unsigned int reg, |
50 | unsigned int *val); |
51 | static int _regmap_bus_read(void *context, unsigned int reg, |
52 | unsigned int *val); |
53 | static int _regmap_bus_formatted_write(void *context, unsigned int reg, |
54 | unsigned int val); |
55 | static int _regmap_bus_reg_write(void *context, unsigned int reg, |
56 | unsigned int val); |
57 | static int _regmap_bus_raw_write(void *context, unsigned int reg, |
58 | unsigned int val); |
59 | |
60 | bool regmap_reg_in_ranges(unsigned int reg, |
61 | const struct regmap_range *ranges, |
62 | unsigned int nranges) |
63 | { |
64 | const struct regmap_range *r; |
65 | int i; |
66 | |
67 | for (i = 0, r = ranges; i < nranges; i++, r++) |
68 | if (regmap_reg_in_range(reg, range: r)) |
69 | return true; |
70 | return false; |
71 | } |
72 | EXPORT_SYMBOL_GPL(regmap_reg_in_ranges); |
73 | |
74 | bool regmap_check_range_table(struct regmap *map, unsigned int reg, |
75 | const struct regmap_access_table *table) |
76 | { |
77 | /* Check "no ranges" first */ |
78 | if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges)) |
79 | return false; |
80 | |
81 | /* In case zero "yes ranges" are supplied, any reg is OK */ |
82 | if (!table->n_yes_ranges) |
83 | return true; |
84 | |
85 | return regmap_reg_in_ranges(reg, table->yes_ranges, |
86 | table->n_yes_ranges); |
87 | } |
88 | EXPORT_SYMBOL_GPL(regmap_check_range_table); |
89 | |
90 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
91 | { |
92 | if (map->max_register && reg > map->max_register) |
93 | return false; |
94 | |
95 | if (map->writeable_reg) |
96 | return map->writeable_reg(map->dev, reg); |
97 | |
98 | if (map->wr_table) |
99 | return regmap_check_range_table(map, reg, map->wr_table); |
100 | |
101 | return true; |
102 | } |
103 | |
104 | bool regmap_cached(struct regmap *map, unsigned int reg) |
105 | { |
106 | int ret; |
107 | unsigned int val; |
108 | |
109 | if (map->cache_type == REGCACHE_NONE) |
110 | return false; |
111 | |
112 | if (!map->cache_ops) |
113 | return false; |
114 | |
115 | if (map->max_register && reg > map->max_register) |
116 | return false; |
117 | |
118 | map->lock(map->lock_arg); |
119 | ret = regcache_read(map, reg, value: &val); |
120 | map->unlock(map->lock_arg); |
121 | if (ret) |
122 | return false; |
123 | |
124 | return true; |
125 | } |
126 | |
127 | bool regmap_readable(struct regmap *map, unsigned int reg) |
128 | { |
129 | if (!map->reg_read) |
130 | return false; |
131 | |
132 | if (map->max_register && reg > map->max_register) |
133 | return false; |
134 | |
135 | if (map->format.format_write) |
136 | return false; |
137 | |
138 | if (map->readable_reg) |
139 | return map->readable_reg(map->dev, reg); |
140 | |
141 | if (map->rd_table) |
142 | return regmap_check_range_table(map, reg, map->rd_table); |
143 | |
144 | return true; |
145 | } |
146 | |
147 | bool regmap_volatile(struct regmap *map, unsigned int reg) |
148 | { |
149 | if (!map->format.format_write && !regmap_readable(map, reg)) |
150 | return false; |
151 | |
152 | if (map->volatile_reg) |
153 | return map->volatile_reg(map->dev, reg); |
154 | |
155 | if (map->volatile_table) |
156 | return regmap_check_range_table(map, reg, map->volatile_table); |
157 | |
158 | if (map->cache_ops) |
159 | return false; |
160 | else |
161 | return true; |
162 | } |
163 | |
164 | bool regmap_precious(struct regmap *map, unsigned int reg) |
165 | { |
166 | if (!regmap_readable(map, reg)) |
167 | return false; |
168 | |
169 | if (map->precious_reg) |
170 | return map->precious_reg(map->dev, reg); |
171 | |
172 | if (map->precious_table) |
173 | return regmap_check_range_table(map, reg, map->precious_table); |
174 | |
175 | return false; |
176 | } |
177 | |
178 | bool regmap_writeable_noinc(struct regmap *map, unsigned int reg) |
179 | { |
180 | if (map->writeable_noinc_reg) |
181 | return map->writeable_noinc_reg(map->dev, reg); |
182 | |
183 | if (map->wr_noinc_table) |
184 | return regmap_check_range_table(map, reg, map->wr_noinc_table); |
185 | |
186 | return true; |
187 | } |
188 | |
189 | bool regmap_readable_noinc(struct regmap *map, unsigned int reg) |
190 | { |
191 | if (map->readable_noinc_reg) |
192 | return map->readable_noinc_reg(map->dev, reg); |
193 | |
194 | if (map->rd_noinc_table) |
195 | return regmap_check_range_table(map, reg, map->rd_noinc_table); |
196 | |
197 | return true; |
198 | } |
199 | |
200 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
201 | size_t num) |
202 | { |
203 | unsigned int i; |
204 | |
205 | for (i = 0; i < num; i++) |
206 | if (!regmap_volatile(map, reg: reg + regmap_get_offset(map, index: i))) |
207 | return false; |
208 | |
209 | return true; |
210 | } |
211 | |
212 | static void regmap_format_12_20_write(struct regmap *map, |
213 | unsigned int reg, unsigned int val) |
214 | { |
215 | u8 *out = map->work_buf; |
216 | |
217 | out[0] = reg >> 4; |
218 | out[1] = (reg << 4) | (val >> 16); |
219 | out[2] = val >> 8; |
220 | out[3] = val; |
221 | } |
222 | |
223 | |
224 | static void regmap_format_2_6_write(struct regmap *map, |
225 | unsigned int reg, unsigned int val) |
226 | { |
227 | u8 *out = map->work_buf; |
228 | |
229 | *out = (reg << 6) | val; |
230 | } |
231 | |
232 | static void regmap_format_4_12_write(struct regmap *map, |
233 | unsigned int reg, unsigned int val) |
234 | { |
235 | __be16 *out = map->work_buf; |
236 | *out = cpu_to_be16((reg << 12) | val); |
237 | } |
238 | |
239 | static void regmap_format_7_9_write(struct regmap *map, |
240 | unsigned int reg, unsigned int val) |
241 | { |
242 | __be16 *out = map->work_buf; |
243 | *out = cpu_to_be16((reg << 9) | val); |
244 | } |
245 | |
246 | static void regmap_format_7_17_write(struct regmap *map, |
247 | unsigned int reg, unsigned int val) |
248 | { |
249 | u8 *out = map->work_buf; |
250 | |
251 | out[2] = val; |
252 | out[1] = val >> 8; |
253 | out[0] = (val >> 16) | (reg << 1); |
254 | } |
255 | |
256 | static void regmap_format_10_14_write(struct regmap *map, |
257 | unsigned int reg, unsigned int val) |
258 | { |
259 | u8 *out = map->work_buf; |
260 | |
261 | out[2] = val; |
262 | out[1] = (val >> 8) | (reg << 6); |
263 | out[0] = reg >> 2; |
264 | } |
265 | |
266 | static void regmap_format_8(void *buf, unsigned int val, unsigned int shift) |
267 | { |
268 | u8 *b = buf; |
269 | |
270 | b[0] = val << shift; |
271 | } |
272 | |
273 | static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift) |
274 | { |
275 | put_unaligned_be16(val: val << shift, p: buf); |
276 | } |
277 | |
278 | static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift) |
279 | { |
280 | put_unaligned_le16(val: val << shift, p: buf); |
281 | } |
282 | |
283 | static void regmap_format_16_native(void *buf, unsigned int val, |
284 | unsigned int shift) |
285 | { |
286 | u16 v = val << shift; |
287 | |
288 | memcpy(buf, &v, sizeof(v)); |
289 | } |
290 | |
291 | static void regmap_format_24_be(void *buf, unsigned int val, unsigned int shift) |
292 | { |
293 | put_unaligned_be24(val: val << shift, p: buf); |
294 | } |
295 | |
296 | static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift) |
297 | { |
298 | put_unaligned_be32(val: val << shift, p: buf); |
299 | } |
300 | |
301 | static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift) |
302 | { |
303 | put_unaligned_le32(val: val << shift, p: buf); |
304 | } |
305 | |
306 | static void regmap_format_32_native(void *buf, unsigned int val, |
307 | unsigned int shift) |
308 | { |
309 | u32 v = val << shift; |
310 | |
311 | memcpy(buf, &v, sizeof(v)); |
312 | } |
313 | |
314 | static void regmap_parse_inplace_noop(void *buf) |
315 | { |
316 | } |
317 | |
318 | static unsigned int regmap_parse_8(const void *buf) |
319 | { |
320 | const u8 *b = buf; |
321 | |
322 | return b[0]; |
323 | } |
324 | |
325 | static unsigned int regmap_parse_16_be(const void *buf) |
326 | { |
327 | return get_unaligned_be16(p: buf); |
328 | } |
329 | |
330 | static unsigned int regmap_parse_16_le(const void *buf) |
331 | { |
332 | return get_unaligned_le16(p: buf); |
333 | } |
334 | |
335 | static void regmap_parse_16_be_inplace(void *buf) |
336 | { |
337 | u16 v = get_unaligned_be16(p: buf); |
338 | |
339 | memcpy(buf, &v, sizeof(v)); |
340 | } |
341 | |
342 | static void regmap_parse_16_le_inplace(void *buf) |
343 | { |
344 | u16 v = get_unaligned_le16(p: buf); |
345 | |
346 | memcpy(buf, &v, sizeof(v)); |
347 | } |
348 | |
349 | static unsigned int regmap_parse_16_native(const void *buf) |
350 | { |
351 | u16 v; |
352 | |
353 | memcpy(&v, buf, sizeof(v)); |
354 | return v; |
355 | } |
356 | |
357 | static unsigned int regmap_parse_24_be(const void *buf) |
358 | { |
359 | return get_unaligned_be24(p: buf); |
360 | } |
361 | |
362 | static unsigned int regmap_parse_32_be(const void *buf) |
363 | { |
364 | return get_unaligned_be32(p: buf); |
365 | } |
366 | |
367 | static unsigned int regmap_parse_32_le(const void *buf) |
368 | { |
369 | return get_unaligned_le32(p: buf); |
370 | } |
371 | |
372 | static void regmap_parse_32_be_inplace(void *buf) |
373 | { |
374 | u32 v = get_unaligned_be32(p: buf); |
375 | |
376 | memcpy(buf, &v, sizeof(v)); |
377 | } |
378 | |
379 | static void regmap_parse_32_le_inplace(void *buf) |
380 | { |
381 | u32 v = get_unaligned_le32(p: buf); |
382 | |
383 | memcpy(buf, &v, sizeof(v)); |
384 | } |
385 | |
386 | static unsigned int regmap_parse_32_native(const void *buf) |
387 | { |
388 | u32 v; |
389 | |
390 | memcpy(&v, buf, sizeof(v)); |
391 | return v; |
392 | } |
393 | |
394 | static void regmap_lock_hwlock(void *__map) |
395 | { |
396 | struct regmap *map = __map; |
397 | |
398 | hwspin_lock_timeout(hwlock: map->hwlock, UINT_MAX); |
399 | } |
400 | |
401 | static void regmap_lock_hwlock_irq(void *__map) |
402 | { |
403 | struct regmap *map = __map; |
404 | |
405 | hwspin_lock_timeout_irq(hwlock: map->hwlock, UINT_MAX); |
406 | } |
407 | |
408 | static void regmap_lock_hwlock_irqsave(void *__map) |
409 | { |
410 | struct regmap *map = __map; |
411 | |
412 | hwspin_lock_timeout_irqsave(hwlock: map->hwlock, UINT_MAX, |
413 | flags: &map->spinlock_flags); |
414 | } |
415 | |
416 | static void regmap_unlock_hwlock(void *__map) |
417 | { |
418 | struct regmap *map = __map; |
419 | |
420 | hwspin_unlock(hwlock: map->hwlock); |
421 | } |
422 | |
423 | static void regmap_unlock_hwlock_irq(void *__map) |
424 | { |
425 | struct regmap *map = __map; |
426 | |
427 | hwspin_unlock_irq(hwlock: map->hwlock); |
428 | } |
429 | |
430 | static void regmap_unlock_hwlock_irqrestore(void *__map) |
431 | { |
432 | struct regmap *map = __map; |
433 | |
434 | hwspin_unlock_irqrestore(hwlock: map->hwlock, flags: &map->spinlock_flags); |
435 | } |
436 | |
437 | static void regmap_lock_unlock_none(void *__map) |
438 | { |
439 | |
440 | } |
441 | |
442 | static void regmap_lock_mutex(void *__map) |
443 | { |
444 | struct regmap *map = __map; |
445 | mutex_lock(&map->mutex); |
446 | } |
447 | |
448 | static void regmap_unlock_mutex(void *__map) |
449 | { |
450 | struct regmap *map = __map; |
451 | mutex_unlock(lock: &map->mutex); |
452 | } |
453 | |
454 | static void regmap_lock_spinlock(void *__map) |
455 | __acquires(&map->spinlock) |
456 | { |
457 | struct regmap *map = __map; |
458 | unsigned long flags; |
459 | |
460 | spin_lock_irqsave(&map->spinlock, flags); |
461 | map->spinlock_flags = flags; |
462 | } |
463 | |
464 | static void regmap_unlock_spinlock(void *__map) |
465 | __releases(&map->spinlock) |
466 | { |
467 | struct regmap *map = __map; |
468 | spin_unlock_irqrestore(lock: &map->spinlock, flags: map->spinlock_flags); |
469 | } |
470 | |
471 | static void regmap_lock_raw_spinlock(void *__map) |
472 | __acquires(&map->raw_spinlock) |
473 | { |
474 | struct regmap *map = __map; |
475 | unsigned long flags; |
476 | |
477 | raw_spin_lock_irqsave(&map->raw_spinlock, flags); |
478 | map->raw_spinlock_flags = flags; |
479 | } |
480 | |
481 | static void regmap_unlock_raw_spinlock(void *__map) |
482 | __releases(&map->raw_spinlock) |
483 | { |
484 | struct regmap *map = __map; |
485 | raw_spin_unlock_irqrestore(&map->raw_spinlock, map->raw_spinlock_flags); |
486 | } |
487 | |
488 | static void dev_get_regmap_release(struct device *dev, void *res) |
489 | { |
490 | /* |
491 | * We don't actually have anything to do here; the goal here |
492 | * is not to manage the regmap but to provide a simple way to |
493 | * get the regmap back given a struct device. |
494 | */ |
495 | } |
496 | |
497 | static bool _regmap_range_add(struct regmap *map, |
498 | struct regmap_range_node *data) |
499 | { |
500 | struct rb_root *root = &map->range_tree; |
501 | struct rb_node **new = &(root->rb_node), *parent = NULL; |
502 | |
503 | while (*new) { |
504 | struct regmap_range_node *this = |
505 | rb_entry(*new, struct regmap_range_node, node); |
506 | |
507 | parent = *new; |
508 | if (data->range_max < this->range_min) |
509 | new = &((*new)->rb_left); |
510 | else if (data->range_min > this->range_max) |
511 | new = &((*new)->rb_right); |
512 | else |
513 | return false; |
514 | } |
515 | |
516 | rb_link_node(node: &data->node, parent, rb_link: new); |
517 | rb_insert_color(&data->node, root); |
518 | |
519 | return true; |
520 | } |
521 | |
522 | static struct regmap_range_node *_regmap_range_lookup(struct regmap *map, |
523 | unsigned int reg) |
524 | { |
525 | struct rb_node *node = map->range_tree.rb_node; |
526 | |
527 | while (node) { |
528 | struct regmap_range_node *this = |
529 | rb_entry(node, struct regmap_range_node, node); |
530 | |
531 | if (reg < this->range_min) |
532 | node = node->rb_left; |
533 | else if (reg > this->range_max) |
534 | node = node->rb_right; |
535 | else |
536 | return this; |
537 | } |
538 | |
539 | return NULL; |
540 | } |
541 | |
542 | static void regmap_range_exit(struct regmap *map) |
543 | { |
544 | struct rb_node *next; |
545 | struct regmap_range_node *range_node; |
546 | |
547 | next = rb_first(&map->range_tree); |
548 | while (next) { |
549 | range_node = rb_entry(next, struct regmap_range_node, node); |
550 | next = rb_next(&range_node->node); |
551 | rb_erase(&range_node->node, &map->range_tree); |
552 | kfree(objp: range_node); |
553 | } |
554 | |
555 | kfree(objp: map->selector_work_buf); |
556 | } |
557 | |
558 | static int regmap_set_name(struct regmap *map, const struct regmap_config *config) |
559 | { |
560 | if (config->name) { |
561 | const char *name = kstrdup_const(s: config->name, GFP_KERNEL); |
562 | |
563 | if (!name) |
564 | return -ENOMEM; |
565 | |
566 | kfree_const(x: map->name); |
567 | map->name = name; |
568 | } |
569 | |
570 | return 0; |
571 | } |
572 | |
573 | int regmap_attach_dev(struct device *dev, struct regmap *map, |
574 | const struct regmap_config *config) |
575 | { |
576 | struct regmap **m; |
577 | int ret; |
578 | |
579 | map->dev = dev; |
580 | |
581 | ret = regmap_set_name(map, config); |
582 | if (ret) |
583 | return ret; |
584 | |
585 | regmap_debugfs_exit(map); |
586 | regmap_debugfs_init(map); |
587 | |
588 | /* Add a devres resource for dev_get_regmap() */ |
589 | m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL); |
590 | if (!m) { |
591 | regmap_debugfs_exit(map); |
592 | return -ENOMEM; |
593 | } |
594 | *m = map; |
595 | devres_add(dev, res: m); |
596 | |
597 | return 0; |
598 | } |
599 | EXPORT_SYMBOL_GPL(regmap_attach_dev); |
600 | |
601 | static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus, |
602 | const struct regmap_config *config) |
603 | { |
604 | enum regmap_endian endian; |
605 | |
606 | /* Retrieve the endianness specification from the regmap config */ |
607 | endian = config->reg_format_endian; |
608 | |
609 | /* If the regmap config specified a non-default value, use that */ |
610 | if (endian != REGMAP_ENDIAN_DEFAULT) |
611 | return endian; |
612 | |
613 | /* Retrieve the endianness specification from the bus config */ |
614 | if (bus && bus->reg_format_endian_default) |
615 | endian = bus->reg_format_endian_default; |
616 | |
617 | /* If the bus specified a non-default value, use that */ |
618 | if (endian != REGMAP_ENDIAN_DEFAULT) |
619 | return endian; |
620 | |
621 | /* Use this if no other value was found */ |
622 | return REGMAP_ENDIAN_BIG; |
623 | } |
624 | |
625 | enum regmap_endian regmap_get_val_endian(struct device *dev, |
626 | const struct regmap_bus *bus, |
627 | const struct regmap_config *config) |
628 | { |
629 | struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; |
630 | enum regmap_endian endian; |
631 | |
632 | /* Retrieve the endianness specification from the regmap config */ |
633 | endian = config->val_format_endian; |
634 | |
635 | /* If the regmap config specified a non-default value, use that */ |
636 | if (endian != REGMAP_ENDIAN_DEFAULT) |
637 | return endian; |
638 | |
639 | /* If the firmware node exist try to get endianness from it */ |
640 | if (fwnode_property_read_bool(fwnode, propname: "big-endian" )) |
641 | endian = REGMAP_ENDIAN_BIG; |
642 | else if (fwnode_property_read_bool(fwnode, propname: "little-endian" )) |
643 | endian = REGMAP_ENDIAN_LITTLE; |
644 | else if (fwnode_property_read_bool(fwnode, propname: "native-endian" )) |
645 | endian = REGMAP_ENDIAN_NATIVE; |
646 | |
647 | /* If the endianness was specified in fwnode, use that */ |
648 | if (endian != REGMAP_ENDIAN_DEFAULT) |
649 | return endian; |
650 | |
651 | /* Retrieve the endianness specification from the bus config */ |
652 | if (bus && bus->val_format_endian_default) |
653 | endian = bus->val_format_endian_default; |
654 | |
655 | /* If the bus specified a non-default value, use that */ |
656 | if (endian != REGMAP_ENDIAN_DEFAULT) |
657 | return endian; |
658 | |
659 | /* Use this if no other value was found */ |
660 | return REGMAP_ENDIAN_BIG; |
661 | } |
662 | EXPORT_SYMBOL_GPL(regmap_get_val_endian); |
663 | |
664 | struct regmap *__regmap_init(struct device *dev, |
665 | const struct regmap_bus *bus, |
666 | void *bus_context, |
667 | const struct regmap_config *config, |
668 | struct lock_class_key *lock_key, |
669 | const char *lock_name) |
670 | { |
671 | struct regmap *map; |
672 | int ret = -EINVAL; |
673 | enum regmap_endian reg_endian, val_endian; |
674 | int i, j; |
675 | |
676 | if (!config) |
677 | goto err; |
678 | |
679 | map = kzalloc(size: sizeof(*map), GFP_KERNEL); |
680 | if (map == NULL) { |
681 | ret = -ENOMEM; |
682 | goto err; |
683 | } |
684 | |
685 | ret = regmap_set_name(map, config); |
686 | if (ret) |
687 | goto err_map; |
688 | |
689 | ret = -EINVAL; /* Later error paths rely on this */ |
690 | |
691 | if (config->disable_locking) { |
692 | map->lock = map->unlock = regmap_lock_unlock_none; |
693 | map->can_sleep = config->can_sleep; |
694 | regmap_debugfs_disable(map); |
695 | } else if (config->lock && config->unlock) { |
696 | map->lock = config->lock; |
697 | map->unlock = config->unlock; |
698 | map->lock_arg = config->lock_arg; |
699 | map->can_sleep = config->can_sleep; |
700 | } else if (config->use_hwlock) { |
701 | map->hwlock = hwspin_lock_request_specific(id: config->hwlock_id); |
702 | if (!map->hwlock) { |
703 | ret = -ENXIO; |
704 | goto err_name; |
705 | } |
706 | |
707 | switch (config->hwlock_mode) { |
708 | case HWLOCK_IRQSTATE: |
709 | map->lock = regmap_lock_hwlock_irqsave; |
710 | map->unlock = regmap_unlock_hwlock_irqrestore; |
711 | break; |
712 | case HWLOCK_IRQ: |
713 | map->lock = regmap_lock_hwlock_irq; |
714 | map->unlock = regmap_unlock_hwlock_irq; |
715 | break; |
716 | default: |
717 | map->lock = regmap_lock_hwlock; |
718 | map->unlock = regmap_unlock_hwlock; |
719 | break; |
720 | } |
721 | |
722 | map->lock_arg = map; |
723 | } else { |
724 | if ((bus && bus->fast_io) || |
725 | config->fast_io) { |
726 | if (config->use_raw_spinlock) { |
727 | raw_spin_lock_init(&map->raw_spinlock); |
728 | map->lock = regmap_lock_raw_spinlock; |
729 | map->unlock = regmap_unlock_raw_spinlock; |
730 | lockdep_set_class_and_name(&map->raw_spinlock, |
731 | lock_key, lock_name); |
732 | } else { |
733 | spin_lock_init(&map->spinlock); |
734 | map->lock = regmap_lock_spinlock; |
735 | map->unlock = regmap_unlock_spinlock; |
736 | lockdep_set_class_and_name(&map->spinlock, |
737 | lock_key, lock_name); |
738 | } |
739 | } else { |
740 | mutex_init(&map->mutex); |
741 | map->lock = regmap_lock_mutex; |
742 | map->unlock = regmap_unlock_mutex; |
743 | map->can_sleep = true; |
744 | lockdep_set_class_and_name(&map->mutex, |
745 | lock_key, lock_name); |
746 | } |
747 | map->lock_arg = map; |
748 | } |
749 | |
750 | /* |
751 | * When we write in fast-paths with regmap_bulk_write() don't allocate |
752 | * scratch buffers with sleeping allocations. |
753 | */ |
754 | if ((bus && bus->fast_io) || config->fast_io) |
755 | map->alloc_flags = GFP_ATOMIC; |
756 | else |
757 | map->alloc_flags = GFP_KERNEL; |
758 | |
759 | map->reg_base = config->reg_base; |
760 | |
761 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
762 | map->format.pad_bytes = config->pad_bits / 8; |
763 | map->format.reg_shift = config->reg_shift; |
764 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
765 | map->format.buf_size = DIV_ROUND_UP(config->reg_bits + |
766 | config->val_bits + config->pad_bits, 8); |
767 | map->reg_shift = config->pad_bits % 8; |
768 | if (config->reg_stride) |
769 | map->reg_stride = config->reg_stride; |
770 | else |
771 | map->reg_stride = 1; |
772 | if (is_power_of_2(n: map->reg_stride)) |
773 | map->reg_stride_order = ilog2(map->reg_stride); |
774 | else |
775 | map->reg_stride_order = -1; |
776 | map->use_single_read = config->use_single_read || !(config->read || (bus && bus->read)); |
777 | map->use_single_write = config->use_single_write || !(config->write || (bus && bus->write)); |
778 | map->can_multi_write = config->can_multi_write && (config->write || (bus && bus->write)); |
779 | if (bus) { |
780 | map->max_raw_read = bus->max_raw_read; |
781 | map->max_raw_write = bus->max_raw_write; |
782 | } else if (config->max_raw_read && config->max_raw_write) { |
783 | map->max_raw_read = config->max_raw_read; |
784 | map->max_raw_write = config->max_raw_write; |
785 | } |
786 | map->dev = dev; |
787 | map->bus = bus; |
788 | map->bus_context = bus_context; |
789 | map->max_register = config->max_register; |
790 | map->wr_table = config->wr_table; |
791 | map->rd_table = config->rd_table; |
792 | map->volatile_table = config->volatile_table; |
793 | map->precious_table = config->precious_table; |
794 | map->wr_noinc_table = config->wr_noinc_table; |
795 | map->rd_noinc_table = config->rd_noinc_table; |
796 | map->writeable_reg = config->writeable_reg; |
797 | map->readable_reg = config->readable_reg; |
798 | map->volatile_reg = config->volatile_reg; |
799 | map->precious_reg = config->precious_reg; |
800 | map->writeable_noinc_reg = config->writeable_noinc_reg; |
801 | map->readable_noinc_reg = config->readable_noinc_reg; |
802 | map->cache_type = config->cache_type; |
803 | |
804 | spin_lock_init(&map->async_lock); |
805 | INIT_LIST_HEAD(list: &map->async_list); |
806 | INIT_LIST_HEAD(list: &map->async_free); |
807 | init_waitqueue_head(&map->async_waitq); |
808 | |
809 | if (config->read_flag_mask || |
810 | config->write_flag_mask || |
811 | config->zero_flag_mask) { |
812 | map->read_flag_mask = config->read_flag_mask; |
813 | map->write_flag_mask = config->write_flag_mask; |
814 | } else if (bus) { |
815 | map->read_flag_mask = bus->read_flag_mask; |
816 | } |
817 | |
818 | if (config && config->read && config->write) { |
819 | map->reg_read = _regmap_bus_read; |
820 | if (config->reg_update_bits) |
821 | map->reg_update_bits = config->reg_update_bits; |
822 | |
823 | /* Bulk read/write */ |
824 | map->read = config->read; |
825 | map->write = config->write; |
826 | |
827 | reg_endian = REGMAP_ENDIAN_NATIVE; |
828 | val_endian = REGMAP_ENDIAN_NATIVE; |
829 | } else if (!bus) { |
830 | map->reg_read = config->reg_read; |
831 | map->reg_write = config->reg_write; |
832 | map->reg_update_bits = config->reg_update_bits; |
833 | |
834 | map->defer_caching = false; |
835 | goto skip_format_initialization; |
836 | } else if (!bus->read || !bus->write) { |
837 | map->reg_read = _regmap_bus_reg_read; |
838 | map->reg_write = _regmap_bus_reg_write; |
839 | map->reg_update_bits = bus->reg_update_bits; |
840 | |
841 | map->defer_caching = false; |
842 | goto skip_format_initialization; |
843 | } else { |
844 | map->reg_read = _regmap_bus_read; |
845 | map->reg_update_bits = bus->reg_update_bits; |
846 | /* Bulk read/write */ |
847 | map->read = bus->read; |
848 | map->write = bus->write; |
849 | |
850 | reg_endian = regmap_get_reg_endian(bus, config); |
851 | val_endian = regmap_get_val_endian(dev, bus, config); |
852 | } |
853 | |
854 | switch (config->reg_bits + map->reg_shift) { |
855 | case 2: |
856 | switch (config->val_bits) { |
857 | case 6: |
858 | map->format.format_write = regmap_format_2_6_write; |
859 | break; |
860 | default: |
861 | goto err_hwlock; |
862 | } |
863 | break; |
864 | |
865 | case 4: |
866 | switch (config->val_bits) { |
867 | case 12: |
868 | map->format.format_write = regmap_format_4_12_write; |
869 | break; |
870 | default: |
871 | goto err_hwlock; |
872 | } |
873 | break; |
874 | |
875 | case 7: |
876 | switch (config->val_bits) { |
877 | case 9: |
878 | map->format.format_write = regmap_format_7_9_write; |
879 | break; |
880 | case 17: |
881 | map->format.format_write = regmap_format_7_17_write; |
882 | break; |
883 | default: |
884 | goto err_hwlock; |
885 | } |
886 | break; |
887 | |
888 | case 10: |
889 | switch (config->val_bits) { |
890 | case 14: |
891 | map->format.format_write = regmap_format_10_14_write; |
892 | break; |
893 | default: |
894 | goto err_hwlock; |
895 | } |
896 | break; |
897 | |
898 | case 12: |
899 | switch (config->val_bits) { |
900 | case 20: |
901 | map->format.format_write = regmap_format_12_20_write; |
902 | break; |
903 | default: |
904 | goto err_hwlock; |
905 | } |
906 | break; |
907 | |
908 | case 8: |
909 | map->format.format_reg = regmap_format_8; |
910 | break; |
911 | |
912 | case 16: |
913 | switch (reg_endian) { |
914 | case REGMAP_ENDIAN_BIG: |
915 | map->format.format_reg = regmap_format_16_be; |
916 | break; |
917 | case REGMAP_ENDIAN_LITTLE: |
918 | map->format.format_reg = regmap_format_16_le; |
919 | break; |
920 | case REGMAP_ENDIAN_NATIVE: |
921 | map->format.format_reg = regmap_format_16_native; |
922 | break; |
923 | default: |
924 | goto err_hwlock; |
925 | } |
926 | break; |
927 | |
928 | case 24: |
929 | switch (reg_endian) { |
930 | case REGMAP_ENDIAN_BIG: |
931 | map->format.format_reg = regmap_format_24_be; |
932 | break; |
933 | default: |
934 | goto err_hwlock; |
935 | } |
936 | break; |
937 | |
938 | case 32: |
939 | switch (reg_endian) { |
940 | case REGMAP_ENDIAN_BIG: |
941 | map->format.format_reg = regmap_format_32_be; |
942 | break; |
943 | case REGMAP_ENDIAN_LITTLE: |
944 | map->format.format_reg = regmap_format_32_le; |
945 | break; |
946 | case REGMAP_ENDIAN_NATIVE: |
947 | map->format.format_reg = regmap_format_32_native; |
948 | break; |
949 | default: |
950 | goto err_hwlock; |
951 | } |
952 | break; |
953 | |
954 | default: |
955 | goto err_hwlock; |
956 | } |
957 | |
958 | if (val_endian == REGMAP_ENDIAN_NATIVE) |
959 | map->format.parse_inplace = regmap_parse_inplace_noop; |
960 | |
961 | switch (config->val_bits) { |
962 | case 8: |
963 | map->format.format_val = regmap_format_8; |
964 | map->format.parse_val = regmap_parse_8; |
965 | map->format.parse_inplace = regmap_parse_inplace_noop; |
966 | break; |
967 | case 16: |
968 | switch (val_endian) { |
969 | case REGMAP_ENDIAN_BIG: |
970 | map->format.format_val = regmap_format_16_be; |
971 | map->format.parse_val = regmap_parse_16_be; |
972 | map->format.parse_inplace = regmap_parse_16_be_inplace; |
973 | break; |
974 | case REGMAP_ENDIAN_LITTLE: |
975 | map->format.format_val = regmap_format_16_le; |
976 | map->format.parse_val = regmap_parse_16_le; |
977 | map->format.parse_inplace = regmap_parse_16_le_inplace; |
978 | break; |
979 | case REGMAP_ENDIAN_NATIVE: |
980 | map->format.format_val = regmap_format_16_native; |
981 | map->format.parse_val = regmap_parse_16_native; |
982 | break; |
983 | default: |
984 | goto err_hwlock; |
985 | } |
986 | break; |
987 | case 24: |
988 | switch (val_endian) { |
989 | case REGMAP_ENDIAN_BIG: |
990 | map->format.format_val = regmap_format_24_be; |
991 | map->format.parse_val = regmap_parse_24_be; |
992 | break; |
993 | default: |
994 | goto err_hwlock; |
995 | } |
996 | break; |
997 | case 32: |
998 | switch (val_endian) { |
999 | case REGMAP_ENDIAN_BIG: |
1000 | map->format.format_val = regmap_format_32_be; |
1001 | map->format.parse_val = regmap_parse_32_be; |
1002 | map->format.parse_inplace = regmap_parse_32_be_inplace; |
1003 | break; |
1004 | case REGMAP_ENDIAN_LITTLE: |
1005 | map->format.format_val = regmap_format_32_le; |
1006 | map->format.parse_val = regmap_parse_32_le; |
1007 | map->format.parse_inplace = regmap_parse_32_le_inplace; |
1008 | break; |
1009 | case REGMAP_ENDIAN_NATIVE: |
1010 | map->format.format_val = regmap_format_32_native; |
1011 | map->format.parse_val = regmap_parse_32_native; |
1012 | break; |
1013 | default: |
1014 | goto err_hwlock; |
1015 | } |
1016 | break; |
1017 | } |
1018 | |
1019 | if (map->format.format_write) { |
1020 | if ((reg_endian != REGMAP_ENDIAN_BIG) || |
1021 | (val_endian != REGMAP_ENDIAN_BIG)) |
1022 | goto err_hwlock; |
1023 | map->use_single_write = true; |
1024 | } |
1025 | |
1026 | if (!map->format.format_write && |
1027 | !(map->format.format_reg && map->format.format_val)) |
1028 | goto err_hwlock; |
1029 | |
1030 | map->work_buf = kzalloc(size: map->format.buf_size, GFP_KERNEL); |
1031 | if (map->work_buf == NULL) { |
1032 | ret = -ENOMEM; |
1033 | goto err_hwlock; |
1034 | } |
1035 | |
1036 | if (map->format.format_write) { |
1037 | map->defer_caching = false; |
1038 | map->reg_write = _regmap_bus_formatted_write; |
1039 | } else if (map->format.format_val) { |
1040 | map->defer_caching = true; |
1041 | map->reg_write = _regmap_bus_raw_write; |
1042 | } |
1043 | |
1044 | skip_format_initialization: |
1045 | |
1046 | map->range_tree = RB_ROOT; |
1047 | for (i = 0; i < config->num_ranges; i++) { |
1048 | const struct regmap_range_cfg *range_cfg = &config->ranges[i]; |
1049 | struct regmap_range_node *new; |
1050 | |
1051 | /* Sanity check */ |
1052 | if (range_cfg->range_max < range_cfg->range_min) { |
1053 | dev_err(map->dev, "Invalid range %d: %d < %d\n" , i, |
1054 | range_cfg->range_max, range_cfg->range_min); |
1055 | goto err_range; |
1056 | } |
1057 | |
1058 | if (range_cfg->range_max > map->max_register) { |
1059 | dev_err(map->dev, "Invalid range %d: %d > %d\n" , i, |
1060 | range_cfg->range_max, map->max_register); |
1061 | goto err_range; |
1062 | } |
1063 | |
1064 | if (range_cfg->selector_reg > map->max_register) { |
1065 | dev_err(map->dev, |
1066 | "Invalid range %d: selector out of map\n" , i); |
1067 | goto err_range; |
1068 | } |
1069 | |
1070 | if (range_cfg->window_len == 0) { |
1071 | dev_err(map->dev, "Invalid range %d: window_len 0\n" , |
1072 | i); |
1073 | goto err_range; |
1074 | } |
1075 | |
1076 | /* Make sure, that this register range has no selector |
1077 | or data window within its boundary */ |
1078 | for (j = 0; j < config->num_ranges; j++) { |
1079 | unsigned int sel_reg = config->ranges[j].selector_reg; |
1080 | unsigned int win_min = config->ranges[j].window_start; |
1081 | unsigned int win_max = win_min + |
1082 | config->ranges[j].window_len - 1; |
1083 | |
1084 | /* Allow data window inside its own virtual range */ |
1085 | if (j == i) |
1086 | continue; |
1087 | |
1088 | if (range_cfg->range_min <= sel_reg && |
1089 | sel_reg <= range_cfg->range_max) { |
1090 | dev_err(map->dev, |
1091 | "Range %d: selector for %d in window\n" , |
1092 | i, j); |
1093 | goto err_range; |
1094 | } |
1095 | |
1096 | if (!(win_max < range_cfg->range_min || |
1097 | win_min > range_cfg->range_max)) { |
1098 | dev_err(map->dev, |
1099 | "Range %d: window for %d in window\n" , |
1100 | i, j); |
1101 | goto err_range; |
1102 | } |
1103 | } |
1104 | |
1105 | new = kzalloc(size: sizeof(*new), GFP_KERNEL); |
1106 | if (new == NULL) { |
1107 | ret = -ENOMEM; |
1108 | goto err_range; |
1109 | } |
1110 | |
1111 | new->map = map; |
1112 | new->name = range_cfg->name; |
1113 | new->range_min = range_cfg->range_min; |
1114 | new->range_max = range_cfg->range_max; |
1115 | new->selector_reg = range_cfg->selector_reg; |
1116 | new->selector_mask = range_cfg->selector_mask; |
1117 | new->selector_shift = range_cfg->selector_shift; |
1118 | new->window_start = range_cfg->window_start; |
1119 | new->window_len = range_cfg->window_len; |
1120 | |
1121 | if (!_regmap_range_add(map, data: new)) { |
1122 | dev_err(map->dev, "Failed to add range %d\n" , i); |
1123 | kfree(objp: new); |
1124 | goto err_range; |
1125 | } |
1126 | |
1127 | if (map->selector_work_buf == NULL) { |
1128 | map->selector_work_buf = |
1129 | kzalloc(size: map->format.buf_size, GFP_KERNEL); |
1130 | if (map->selector_work_buf == NULL) { |
1131 | ret = -ENOMEM; |
1132 | goto err_range; |
1133 | } |
1134 | } |
1135 | } |
1136 | |
1137 | ret = regcache_init(map, config); |
1138 | if (ret != 0) |
1139 | goto err_range; |
1140 | |
1141 | if (dev) { |
1142 | ret = regmap_attach_dev(dev, map, config); |
1143 | if (ret != 0) |
1144 | goto err_regcache; |
1145 | } else { |
1146 | regmap_debugfs_init(map); |
1147 | } |
1148 | |
1149 | return map; |
1150 | |
1151 | err_regcache: |
1152 | regcache_exit(map); |
1153 | err_range: |
1154 | regmap_range_exit(map); |
1155 | kfree(objp: map->work_buf); |
1156 | err_hwlock: |
1157 | if (map->hwlock) |
1158 | hwspin_lock_free(hwlock: map->hwlock); |
1159 | err_name: |
1160 | kfree_const(x: map->name); |
1161 | err_map: |
1162 | kfree(objp: map); |
1163 | err: |
1164 | return ERR_PTR(error: ret); |
1165 | } |
1166 | EXPORT_SYMBOL_GPL(__regmap_init); |
1167 | |
1168 | static void devm_regmap_release(struct device *dev, void *res) |
1169 | { |
1170 | regmap_exit(map: *(struct regmap **)res); |
1171 | } |
1172 | |
1173 | struct regmap *__devm_regmap_init(struct device *dev, |
1174 | const struct regmap_bus *bus, |
1175 | void *bus_context, |
1176 | const struct regmap_config *config, |
1177 | struct lock_class_key *lock_key, |
1178 | const char *lock_name) |
1179 | { |
1180 | struct regmap **ptr, *regmap; |
1181 | |
1182 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); |
1183 | if (!ptr) |
1184 | return ERR_PTR(error: -ENOMEM); |
1185 | |
1186 | regmap = __regmap_init(dev, bus, bus_context, config, |
1187 | lock_key, lock_name); |
1188 | if (!IS_ERR(ptr: regmap)) { |
1189 | *ptr = regmap; |
1190 | devres_add(dev, res: ptr); |
1191 | } else { |
1192 | devres_free(res: ptr); |
1193 | } |
1194 | |
1195 | return regmap; |
1196 | } |
1197 | EXPORT_SYMBOL_GPL(__devm_regmap_init); |
1198 | |
1199 | static void regmap_field_init(struct regmap_field *rm_field, |
1200 | struct regmap *regmap, struct reg_field reg_field) |
1201 | { |
1202 | rm_field->regmap = regmap; |
1203 | rm_field->reg = reg_field.reg; |
1204 | rm_field->shift = reg_field.lsb; |
1205 | rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb); |
1206 | |
1207 | WARN_ONCE(rm_field->mask == 0, "invalid empty mask defined\n" ); |
1208 | |
1209 | rm_field->id_size = reg_field.id_size; |
1210 | rm_field->id_offset = reg_field.id_offset; |
1211 | } |
1212 | |
1213 | /** |
1214 | * devm_regmap_field_alloc() - Allocate and initialise a register field. |
1215 | * |
1216 | * @dev: Device that will be interacted with |
1217 | * @regmap: regmap bank in which this register field is located. |
1218 | * @reg_field: Register field with in the bank. |
1219 | * |
1220 | * The return value will be an ERR_PTR() on error or a valid pointer |
1221 | * to a struct regmap_field. The regmap_field will be automatically freed |
1222 | * by the device management code. |
1223 | */ |
1224 | struct regmap_field *devm_regmap_field_alloc(struct device *dev, |
1225 | struct regmap *regmap, struct reg_field reg_field) |
1226 | { |
1227 | struct regmap_field *rm_field = devm_kzalloc(dev, |
1228 | size: sizeof(*rm_field), GFP_KERNEL); |
1229 | if (!rm_field) |
1230 | return ERR_PTR(error: -ENOMEM); |
1231 | |
1232 | regmap_field_init(rm_field, regmap, reg_field); |
1233 | |
1234 | return rm_field; |
1235 | |
1236 | } |
1237 | EXPORT_SYMBOL_GPL(devm_regmap_field_alloc); |
1238 | |
1239 | |
1240 | /** |
1241 | * regmap_field_bulk_alloc() - Allocate and initialise a bulk register field. |
1242 | * |
1243 | * @regmap: regmap bank in which this register field is located. |
1244 | * @rm_field: regmap register fields within the bank. |
1245 | * @reg_field: Register fields within the bank. |
1246 | * @num_fields: Number of register fields. |
1247 | * |
1248 | * The return value will be an -ENOMEM on error or zero for success. |
1249 | * Newly allocated regmap_fields should be freed by calling |
1250 | * regmap_field_bulk_free() |
1251 | */ |
1252 | int regmap_field_bulk_alloc(struct regmap *regmap, |
1253 | struct regmap_field **rm_field, |
1254 | const struct reg_field *reg_field, |
1255 | int num_fields) |
1256 | { |
1257 | struct regmap_field *rf; |
1258 | int i; |
1259 | |
1260 | rf = kcalloc(n: num_fields, size: sizeof(*rf), GFP_KERNEL); |
1261 | if (!rf) |
1262 | return -ENOMEM; |
1263 | |
1264 | for (i = 0; i < num_fields; i++) { |
1265 | regmap_field_init(rm_field: &rf[i], regmap, reg_field: reg_field[i]); |
1266 | rm_field[i] = &rf[i]; |
1267 | } |
1268 | |
1269 | return 0; |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(regmap_field_bulk_alloc); |
1272 | |
1273 | /** |
1274 | * devm_regmap_field_bulk_alloc() - Allocate and initialise a bulk register |
1275 | * fields. |
1276 | * |
1277 | * @dev: Device that will be interacted with |
1278 | * @regmap: regmap bank in which this register field is located. |
1279 | * @rm_field: regmap register fields within the bank. |
1280 | * @reg_field: Register fields within the bank. |
1281 | * @num_fields: Number of register fields. |
1282 | * |
1283 | * The return value will be an -ENOMEM on error or zero for success. |
1284 | * Newly allocated regmap_fields will be automatically freed by the |
1285 | * device management code. |
1286 | */ |
1287 | int devm_regmap_field_bulk_alloc(struct device *dev, |
1288 | struct regmap *regmap, |
1289 | struct regmap_field **rm_field, |
1290 | const struct reg_field *reg_field, |
1291 | int num_fields) |
1292 | { |
1293 | struct regmap_field *rf; |
1294 | int i; |
1295 | |
1296 | rf = devm_kcalloc(dev, n: num_fields, size: sizeof(*rf), GFP_KERNEL); |
1297 | if (!rf) |
1298 | return -ENOMEM; |
1299 | |
1300 | for (i = 0; i < num_fields; i++) { |
1301 | regmap_field_init(rm_field: &rf[i], regmap, reg_field: reg_field[i]); |
1302 | rm_field[i] = &rf[i]; |
1303 | } |
1304 | |
1305 | return 0; |
1306 | } |
1307 | EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_alloc); |
1308 | |
1309 | /** |
1310 | * regmap_field_bulk_free() - Free register field allocated using |
1311 | * regmap_field_bulk_alloc. |
1312 | * |
1313 | * @field: regmap fields which should be freed. |
1314 | */ |
1315 | void regmap_field_bulk_free(struct regmap_field *field) |
1316 | { |
1317 | kfree(objp: field); |
1318 | } |
1319 | EXPORT_SYMBOL_GPL(regmap_field_bulk_free); |
1320 | |
1321 | /** |
1322 | * devm_regmap_field_bulk_free() - Free a bulk register field allocated using |
1323 | * devm_regmap_field_bulk_alloc. |
1324 | * |
1325 | * @dev: Device that will be interacted with |
1326 | * @field: regmap field which should be freed. |
1327 | * |
1328 | * Free register field allocated using devm_regmap_field_bulk_alloc(). Usually |
1329 | * drivers need not call this function, as the memory allocated via devm |
1330 | * will be freed as per device-driver life-cycle. |
1331 | */ |
1332 | void devm_regmap_field_bulk_free(struct device *dev, |
1333 | struct regmap_field *field) |
1334 | { |
1335 | devm_kfree(dev, p: field); |
1336 | } |
1337 | EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_free); |
1338 | |
1339 | /** |
1340 | * devm_regmap_field_free() - Free a register field allocated using |
1341 | * devm_regmap_field_alloc. |
1342 | * |
1343 | * @dev: Device that will be interacted with |
1344 | * @field: regmap field which should be freed. |
1345 | * |
1346 | * Free register field allocated using devm_regmap_field_alloc(). Usually |
1347 | * drivers need not call this function, as the memory allocated via devm |
1348 | * will be freed as per device-driver life-cyle. |
1349 | */ |
1350 | void devm_regmap_field_free(struct device *dev, |
1351 | struct regmap_field *field) |
1352 | { |
1353 | devm_kfree(dev, p: field); |
1354 | } |
1355 | EXPORT_SYMBOL_GPL(devm_regmap_field_free); |
1356 | |
1357 | /** |
1358 | * regmap_field_alloc() - Allocate and initialise a register field. |
1359 | * |
1360 | * @regmap: regmap bank in which this register field is located. |
1361 | * @reg_field: Register field with in the bank. |
1362 | * |
1363 | * The return value will be an ERR_PTR() on error or a valid pointer |
1364 | * to a struct regmap_field. The regmap_field should be freed by the |
1365 | * user once its finished working with it using regmap_field_free(). |
1366 | */ |
1367 | struct regmap_field *regmap_field_alloc(struct regmap *regmap, |
1368 | struct reg_field reg_field) |
1369 | { |
1370 | struct regmap_field *rm_field = kzalloc(size: sizeof(*rm_field), GFP_KERNEL); |
1371 | |
1372 | if (!rm_field) |
1373 | return ERR_PTR(error: -ENOMEM); |
1374 | |
1375 | regmap_field_init(rm_field, regmap, reg_field); |
1376 | |
1377 | return rm_field; |
1378 | } |
1379 | EXPORT_SYMBOL_GPL(regmap_field_alloc); |
1380 | |
1381 | /** |
1382 | * regmap_field_free() - Free register field allocated using |
1383 | * regmap_field_alloc. |
1384 | * |
1385 | * @field: regmap field which should be freed. |
1386 | */ |
1387 | void regmap_field_free(struct regmap_field *field) |
1388 | { |
1389 | kfree(objp: field); |
1390 | } |
1391 | EXPORT_SYMBOL_GPL(regmap_field_free); |
1392 | |
1393 | /** |
1394 | * regmap_reinit_cache() - Reinitialise the current register cache |
1395 | * |
1396 | * @map: Register map to operate on. |
1397 | * @config: New configuration. Only the cache data will be used. |
1398 | * |
1399 | * Discard any existing register cache for the map and initialize a |
1400 | * new cache. This can be used to restore the cache to defaults or to |
1401 | * update the cache configuration to reflect runtime discovery of the |
1402 | * hardware. |
1403 | * |
1404 | * No explicit locking is done here, the user needs to ensure that |
1405 | * this function will not race with other calls to regmap. |
1406 | */ |
1407 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) |
1408 | { |
1409 | int ret; |
1410 | |
1411 | regcache_exit(map); |
1412 | regmap_debugfs_exit(map); |
1413 | |
1414 | map->max_register = config->max_register; |
1415 | map->writeable_reg = config->writeable_reg; |
1416 | map->readable_reg = config->readable_reg; |
1417 | map->volatile_reg = config->volatile_reg; |
1418 | map->precious_reg = config->precious_reg; |
1419 | map->writeable_noinc_reg = config->writeable_noinc_reg; |
1420 | map->readable_noinc_reg = config->readable_noinc_reg; |
1421 | map->cache_type = config->cache_type; |
1422 | |
1423 | ret = regmap_set_name(map, config); |
1424 | if (ret) |
1425 | return ret; |
1426 | |
1427 | regmap_debugfs_init(map); |
1428 | |
1429 | map->cache_bypass = false; |
1430 | map->cache_only = false; |
1431 | |
1432 | return regcache_init(map, config); |
1433 | } |
1434 | EXPORT_SYMBOL_GPL(regmap_reinit_cache); |
1435 | |
1436 | /** |
1437 | * regmap_exit() - Free a previously allocated register map |
1438 | * |
1439 | * @map: Register map to operate on. |
1440 | */ |
1441 | void regmap_exit(struct regmap *map) |
1442 | { |
1443 | struct regmap_async *async; |
1444 | |
1445 | regcache_exit(map); |
1446 | regmap_debugfs_exit(map); |
1447 | regmap_range_exit(map); |
1448 | if (map->bus && map->bus->free_context) |
1449 | map->bus->free_context(map->bus_context); |
1450 | kfree(objp: map->work_buf); |
1451 | while (!list_empty(head: &map->async_free)) { |
1452 | async = list_first_entry_or_null(&map->async_free, |
1453 | struct regmap_async, |
1454 | list); |
1455 | list_del(entry: &async->list); |
1456 | kfree(objp: async->work_buf); |
1457 | kfree(objp: async); |
1458 | } |
1459 | if (map->hwlock) |
1460 | hwspin_lock_free(hwlock: map->hwlock); |
1461 | if (map->lock == regmap_lock_mutex) |
1462 | mutex_destroy(lock: &map->mutex); |
1463 | kfree_const(x: map->name); |
1464 | kfree(objp: map->patch); |
1465 | if (map->bus && map->bus->free_on_exit) |
1466 | kfree(objp: map->bus); |
1467 | kfree(objp: map); |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(regmap_exit); |
1470 | |
1471 | static int dev_get_regmap_match(struct device *dev, void *res, void *data) |
1472 | { |
1473 | struct regmap **r = res; |
1474 | if (!r || !*r) { |
1475 | WARN_ON(!r || !*r); |
1476 | return 0; |
1477 | } |
1478 | |
1479 | /* If the user didn't specify a name match any */ |
1480 | if (data) |
1481 | return (*r)->name && !strcmp((*r)->name, data); |
1482 | else |
1483 | return 1; |
1484 | } |
1485 | |
1486 | /** |
1487 | * dev_get_regmap() - Obtain the regmap (if any) for a device |
1488 | * |
1489 | * @dev: Device to retrieve the map for |
1490 | * @name: Optional name for the register map, usually NULL. |
1491 | * |
1492 | * Returns the regmap for the device if one is present, or NULL. If |
1493 | * name is specified then it must match the name specified when |
1494 | * registering the device, if it is NULL then the first regmap found |
1495 | * will be used. Devices with multiple register maps are very rare, |
1496 | * generic code should normally not need to specify a name. |
1497 | */ |
1498 | struct regmap *dev_get_regmap(struct device *dev, const char *name) |
1499 | { |
1500 | struct regmap **r = devres_find(dev, release: dev_get_regmap_release, |
1501 | match: dev_get_regmap_match, match_data: (void *)name); |
1502 | |
1503 | if (!r) |
1504 | return NULL; |
1505 | return *r; |
1506 | } |
1507 | EXPORT_SYMBOL_GPL(dev_get_regmap); |
1508 | |
1509 | /** |
1510 | * regmap_get_device() - Obtain the device from a regmap |
1511 | * |
1512 | * @map: Register map to operate on. |
1513 | * |
1514 | * Returns the underlying device that the regmap has been created for. |
1515 | */ |
1516 | struct device *regmap_get_device(struct regmap *map) |
1517 | { |
1518 | return map->dev; |
1519 | } |
1520 | EXPORT_SYMBOL_GPL(regmap_get_device); |
1521 | |
1522 | static int _regmap_select_page(struct regmap *map, unsigned int *reg, |
1523 | struct regmap_range_node *range, |
1524 | unsigned int val_num) |
1525 | { |
1526 | void *orig_work_buf; |
1527 | unsigned int win_offset; |
1528 | unsigned int win_page; |
1529 | bool page_chg; |
1530 | int ret; |
1531 | |
1532 | win_offset = (*reg - range->range_min) % range->window_len; |
1533 | win_page = (*reg - range->range_min) / range->window_len; |
1534 | |
1535 | if (val_num > 1) { |
1536 | /* Bulk write shouldn't cross range boundary */ |
1537 | if (*reg + val_num - 1 > range->range_max) |
1538 | return -EINVAL; |
1539 | |
1540 | /* ... or single page boundary */ |
1541 | if (val_num > range->window_len - win_offset) |
1542 | return -EINVAL; |
1543 | } |
1544 | |
1545 | /* It is possible to have selector register inside data window. |
1546 | In that case, selector register is located on every page and |
1547 | it needs no page switching, when accessed alone. */ |
1548 | if (val_num > 1 || |
1549 | range->window_start + win_offset != range->selector_reg) { |
1550 | /* Use separate work_buf during page switching */ |
1551 | orig_work_buf = map->work_buf; |
1552 | map->work_buf = map->selector_work_buf; |
1553 | |
1554 | ret = _regmap_update_bits(map, reg: range->selector_reg, |
1555 | mask: range->selector_mask, |
1556 | val: win_page << range->selector_shift, |
1557 | change: &page_chg, force_write: false); |
1558 | |
1559 | map->work_buf = orig_work_buf; |
1560 | |
1561 | if (ret != 0) |
1562 | return ret; |
1563 | } |
1564 | |
1565 | *reg = range->window_start + win_offset; |
1566 | |
1567 | return 0; |
1568 | } |
1569 | |
1570 | static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes, |
1571 | unsigned long mask) |
1572 | { |
1573 | u8 *buf; |
1574 | int i; |
1575 | |
1576 | if (!mask || !map->work_buf) |
1577 | return; |
1578 | |
1579 | buf = map->work_buf; |
1580 | |
1581 | for (i = 0; i < max_bytes; i++) |
1582 | buf[i] |= (mask >> (8 * i)) & 0xff; |
1583 | } |
1584 | |
1585 | static unsigned int regmap_reg_addr(struct regmap *map, unsigned int reg) |
1586 | { |
1587 | reg += map->reg_base; |
1588 | |
1589 | if (map->format.reg_shift > 0) |
1590 | reg >>= map->format.reg_shift; |
1591 | else if (map->format.reg_shift < 0) |
1592 | reg <<= -(map->format.reg_shift); |
1593 | |
1594 | return reg; |
1595 | } |
1596 | |
1597 | static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg, |
1598 | const void *val, size_t val_len, bool noinc) |
1599 | { |
1600 | struct regmap_range_node *range; |
1601 | unsigned long flags; |
1602 | void *work_val = map->work_buf + map->format.reg_bytes + |
1603 | map->format.pad_bytes; |
1604 | void *buf; |
1605 | int ret = -ENOTSUPP; |
1606 | size_t len; |
1607 | int i; |
1608 | |
1609 | /* Check for unwritable or noinc registers in range |
1610 | * before we start |
1611 | */ |
1612 | if (!regmap_writeable_noinc(map, reg)) { |
1613 | for (i = 0; i < val_len / map->format.val_bytes; i++) { |
1614 | unsigned int element = |
1615 | reg + regmap_get_offset(map, index: i); |
1616 | if (!regmap_writeable(map, reg: element) || |
1617 | regmap_writeable_noinc(map, reg: element)) |
1618 | return -EINVAL; |
1619 | } |
1620 | } |
1621 | |
1622 | if (!map->cache_bypass && map->format.parse_val) { |
1623 | unsigned int ival, offset; |
1624 | int val_bytes = map->format.val_bytes; |
1625 | |
1626 | /* Cache the last written value for noinc writes */ |
1627 | i = noinc ? val_len - val_bytes : 0; |
1628 | for (; i < val_len; i += val_bytes) { |
1629 | ival = map->format.parse_val(val + i); |
1630 | offset = noinc ? 0 : regmap_get_offset(map, index: i / val_bytes); |
1631 | ret = regcache_write(map, reg: reg + offset, value: ival); |
1632 | if (ret) { |
1633 | dev_err(map->dev, |
1634 | "Error in caching of register: %x ret: %d\n" , |
1635 | reg + offset, ret); |
1636 | return ret; |
1637 | } |
1638 | } |
1639 | if (map->cache_only) { |
1640 | map->cache_dirty = true; |
1641 | return 0; |
1642 | } |
1643 | } |
1644 | |
1645 | range = _regmap_range_lookup(map, reg); |
1646 | if (range) { |
1647 | int val_num = val_len / map->format.val_bytes; |
1648 | int win_offset = (reg - range->range_min) % range->window_len; |
1649 | int win_residue = range->window_len - win_offset; |
1650 | |
1651 | /* If the write goes beyond the end of the window split it */ |
1652 | while (val_num > win_residue) { |
1653 | dev_dbg(map->dev, "Writing window %d/%zu\n" , |
1654 | win_residue, val_len / map->format.val_bytes); |
1655 | ret = _regmap_raw_write_impl(map, reg, val, |
1656 | val_len: win_residue * |
1657 | map->format.val_bytes, noinc); |
1658 | if (ret != 0) |
1659 | return ret; |
1660 | |
1661 | reg += win_residue; |
1662 | val_num -= win_residue; |
1663 | val += win_residue * map->format.val_bytes; |
1664 | val_len -= win_residue * map->format.val_bytes; |
1665 | |
1666 | win_offset = (reg - range->range_min) % |
1667 | range->window_len; |
1668 | win_residue = range->window_len - win_offset; |
1669 | } |
1670 | |
1671 | ret = _regmap_select_page(map, reg: ®, range, val_num: noinc ? 1 : val_num); |
1672 | if (ret != 0) |
1673 | return ret; |
1674 | } |
1675 | |
1676 | reg = regmap_reg_addr(map, reg); |
1677 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
1678 | regmap_set_work_buf_flag_mask(map, max_bytes: map->format.reg_bytes, |
1679 | mask: map->write_flag_mask); |
1680 | |
1681 | /* |
1682 | * Essentially all I/O mechanisms will be faster with a single |
1683 | * buffer to write. Since register syncs often generate raw |
1684 | * writes of single registers optimise that case. |
1685 | */ |
1686 | if (val != work_val && val_len == map->format.val_bytes) { |
1687 | memcpy(work_val, val, map->format.val_bytes); |
1688 | val = work_val; |
1689 | } |
1690 | |
1691 | if (map->async && map->bus && map->bus->async_write) { |
1692 | struct regmap_async *async; |
1693 | |
1694 | trace_regmap_async_write_start(map, reg, count: val_len); |
1695 | |
1696 | spin_lock_irqsave(&map->async_lock, flags); |
1697 | async = list_first_entry_or_null(&map->async_free, |
1698 | struct regmap_async, |
1699 | list); |
1700 | if (async) |
1701 | list_del(entry: &async->list); |
1702 | spin_unlock_irqrestore(lock: &map->async_lock, flags); |
1703 | |
1704 | if (!async) { |
1705 | async = map->bus->async_alloc(); |
1706 | if (!async) |
1707 | return -ENOMEM; |
1708 | |
1709 | async->work_buf = kzalloc(size: map->format.buf_size, |
1710 | GFP_KERNEL | GFP_DMA); |
1711 | if (!async->work_buf) { |
1712 | kfree(objp: async); |
1713 | return -ENOMEM; |
1714 | } |
1715 | } |
1716 | |
1717 | async->map = map; |
1718 | |
1719 | /* If the caller supplied the value we can use it safely. */ |
1720 | memcpy(async->work_buf, map->work_buf, map->format.pad_bytes + |
1721 | map->format.reg_bytes + map->format.val_bytes); |
1722 | |
1723 | spin_lock_irqsave(&map->async_lock, flags); |
1724 | list_add_tail(new: &async->list, head: &map->async_list); |
1725 | spin_unlock_irqrestore(lock: &map->async_lock, flags); |
1726 | |
1727 | if (val != work_val) |
1728 | ret = map->bus->async_write(map->bus_context, |
1729 | async->work_buf, |
1730 | map->format.reg_bytes + |
1731 | map->format.pad_bytes, |
1732 | val, val_len, async); |
1733 | else |
1734 | ret = map->bus->async_write(map->bus_context, |
1735 | async->work_buf, |
1736 | map->format.reg_bytes + |
1737 | map->format.pad_bytes + |
1738 | val_len, NULL, 0, async); |
1739 | |
1740 | if (ret != 0) { |
1741 | dev_err(map->dev, "Failed to schedule write: %d\n" , |
1742 | ret); |
1743 | |
1744 | spin_lock_irqsave(&map->async_lock, flags); |
1745 | list_move(list: &async->list, head: &map->async_free); |
1746 | spin_unlock_irqrestore(lock: &map->async_lock, flags); |
1747 | } |
1748 | |
1749 | return ret; |
1750 | } |
1751 | |
1752 | trace_regmap_hw_write_start(map, reg, count: val_len / map->format.val_bytes); |
1753 | |
1754 | /* If we're doing a single register write we can probably just |
1755 | * send the work_buf directly, otherwise try to do a gather |
1756 | * write. |
1757 | */ |
1758 | if (val == work_val) |
1759 | ret = map->write(map->bus_context, map->work_buf, |
1760 | map->format.reg_bytes + |
1761 | map->format.pad_bytes + |
1762 | val_len); |
1763 | else if (map->bus && map->bus->gather_write) |
1764 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
1765 | map->format.reg_bytes + |
1766 | map->format.pad_bytes, |
1767 | val, val_len); |
1768 | else |
1769 | ret = -ENOTSUPP; |
1770 | |
1771 | /* If that didn't work fall back on linearising by hand. */ |
1772 | if (ret == -ENOTSUPP) { |
1773 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
1774 | buf = kzalloc(size: len, GFP_KERNEL); |
1775 | if (!buf) |
1776 | return -ENOMEM; |
1777 | |
1778 | memcpy(buf, map->work_buf, map->format.reg_bytes); |
1779 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
1780 | val, val_len); |
1781 | ret = map->write(map->bus_context, buf, len); |
1782 | |
1783 | kfree(objp: buf); |
1784 | } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) { |
1785 | /* regcache_drop_region() takes lock that we already have, |
1786 | * thus call map->cache_ops->drop() directly |
1787 | */ |
1788 | if (map->cache_ops && map->cache_ops->drop) |
1789 | map->cache_ops->drop(map, reg, reg + 1); |
1790 | } |
1791 | |
1792 | trace_regmap_hw_write_done(map, reg, count: val_len / map->format.val_bytes); |
1793 | |
1794 | return ret; |
1795 | } |
1796 | |
1797 | /** |
1798 | * regmap_can_raw_write - Test if regmap_raw_write() is supported |
1799 | * |
1800 | * @map: Map to check. |
1801 | */ |
1802 | bool regmap_can_raw_write(struct regmap *map) |
1803 | { |
1804 | return map->write && map->format.format_val && map->format.format_reg; |
1805 | } |
1806 | EXPORT_SYMBOL_GPL(regmap_can_raw_write); |
1807 | |
1808 | /** |
1809 | * regmap_get_raw_read_max - Get the maximum size we can read |
1810 | * |
1811 | * @map: Map to check. |
1812 | */ |
1813 | size_t regmap_get_raw_read_max(struct regmap *map) |
1814 | { |
1815 | return map->max_raw_read; |
1816 | } |
1817 | EXPORT_SYMBOL_GPL(regmap_get_raw_read_max); |
1818 | |
1819 | /** |
1820 | * regmap_get_raw_write_max - Get the maximum size we can read |
1821 | * |
1822 | * @map: Map to check. |
1823 | */ |
1824 | size_t regmap_get_raw_write_max(struct regmap *map) |
1825 | { |
1826 | return map->max_raw_write; |
1827 | } |
1828 | EXPORT_SYMBOL_GPL(regmap_get_raw_write_max); |
1829 | |
1830 | static int _regmap_bus_formatted_write(void *context, unsigned int reg, |
1831 | unsigned int val) |
1832 | { |
1833 | int ret; |
1834 | struct regmap_range_node *range; |
1835 | struct regmap *map = context; |
1836 | |
1837 | WARN_ON(!map->format.format_write); |
1838 | |
1839 | range = _regmap_range_lookup(map, reg); |
1840 | if (range) { |
1841 | ret = _regmap_select_page(map, reg: ®, range, val_num: 1); |
1842 | if (ret != 0) |
1843 | return ret; |
1844 | } |
1845 | |
1846 | reg = regmap_reg_addr(map, reg); |
1847 | map->format.format_write(map, reg, val); |
1848 | |
1849 | trace_regmap_hw_write_start(map, reg, count: 1); |
1850 | |
1851 | ret = map->write(map->bus_context, map->work_buf, map->format.buf_size); |
1852 | |
1853 | trace_regmap_hw_write_done(map, reg, count: 1); |
1854 | |
1855 | return ret; |
1856 | } |
1857 | |
1858 | static int _regmap_bus_reg_write(void *context, unsigned int reg, |
1859 | unsigned int val) |
1860 | { |
1861 | struct regmap *map = context; |
1862 | struct regmap_range_node *range; |
1863 | int ret; |
1864 | |
1865 | range = _regmap_range_lookup(map, reg); |
1866 | if (range) { |
1867 | ret = _regmap_select_page(map, reg: ®, range, val_num: 1); |
1868 | if (ret != 0) |
1869 | return ret; |
1870 | } |
1871 | |
1872 | reg = regmap_reg_addr(map, reg); |
1873 | return map->bus->reg_write(map->bus_context, reg, val); |
1874 | } |
1875 | |
1876 | static int _regmap_bus_raw_write(void *context, unsigned int reg, |
1877 | unsigned int val) |
1878 | { |
1879 | struct regmap *map = context; |
1880 | |
1881 | WARN_ON(!map->format.format_val); |
1882 | |
1883 | map->format.format_val(map->work_buf + map->format.reg_bytes |
1884 | + map->format.pad_bytes, val, 0); |
1885 | return _regmap_raw_write_impl(map, reg, |
1886 | val: map->work_buf + |
1887 | map->format.reg_bytes + |
1888 | map->format.pad_bytes, |
1889 | val_len: map->format.val_bytes, |
1890 | noinc: false); |
1891 | } |
1892 | |
1893 | static inline void *_regmap_map_get_context(struct regmap *map) |
1894 | { |
1895 | return (map->bus || (!map->bus && map->read)) ? map : map->bus_context; |
1896 | } |
1897 | |
1898 | int _regmap_write(struct regmap *map, unsigned int reg, |
1899 | unsigned int val) |
1900 | { |
1901 | int ret; |
1902 | void *context = _regmap_map_get_context(map); |
1903 | |
1904 | if (!regmap_writeable(map, reg)) |
1905 | return -EIO; |
1906 | |
1907 | if (!map->cache_bypass && !map->defer_caching) { |
1908 | ret = regcache_write(map, reg, value: val); |
1909 | if (ret != 0) |
1910 | return ret; |
1911 | if (map->cache_only) { |
1912 | map->cache_dirty = true; |
1913 | return 0; |
1914 | } |
1915 | } |
1916 | |
1917 | ret = map->reg_write(context, reg, val); |
1918 | if (ret == 0) { |
1919 | if (regmap_should_log(map)) |
1920 | dev_info(map->dev, "%x <= %x\n" , reg, val); |
1921 | |
1922 | trace_regmap_reg_write(map, reg, val); |
1923 | } |
1924 | |
1925 | return ret; |
1926 | } |
1927 | |
1928 | /** |
1929 | * regmap_write() - Write a value to a single register |
1930 | * |
1931 | * @map: Register map to write to |
1932 | * @reg: Register to write to |
1933 | * @val: Value to be written |
1934 | * |
1935 | * A value of zero will be returned on success, a negative errno will |
1936 | * be returned in error cases. |
1937 | */ |
1938 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) |
1939 | { |
1940 | int ret; |
1941 | |
1942 | if (!IS_ALIGNED(reg, map->reg_stride)) |
1943 | return -EINVAL; |
1944 | |
1945 | map->lock(map->lock_arg); |
1946 | |
1947 | ret = _regmap_write(map, reg, val); |
1948 | |
1949 | map->unlock(map->lock_arg); |
1950 | |
1951 | return ret; |
1952 | } |
1953 | EXPORT_SYMBOL_GPL(regmap_write); |
1954 | |
1955 | /** |
1956 | * regmap_write_async() - Write a value to a single register asynchronously |
1957 | * |
1958 | * @map: Register map to write to |
1959 | * @reg: Register to write to |
1960 | * @val: Value to be written |
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_write_async(struct regmap *map, unsigned int reg, unsigned int val) |
1966 | { |
1967 | int ret; |
1968 | |
1969 | if (!IS_ALIGNED(reg, map->reg_stride)) |
1970 | return -EINVAL; |
1971 | |
1972 | map->lock(map->lock_arg); |
1973 | |
1974 | map->async = true; |
1975 | |
1976 | ret = _regmap_write(map, reg, val); |
1977 | |
1978 | map->async = false; |
1979 | |
1980 | map->unlock(map->lock_arg); |
1981 | |
1982 | return ret; |
1983 | } |
1984 | EXPORT_SYMBOL_GPL(regmap_write_async); |
1985 | |
1986 | int _regmap_raw_write(struct regmap *map, unsigned int reg, |
1987 | const void *val, size_t val_len, bool noinc) |
1988 | { |
1989 | size_t val_bytes = map->format.val_bytes; |
1990 | size_t val_count = val_len / val_bytes; |
1991 | size_t chunk_count, chunk_bytes; |
1992 | size_t chunk_regs = val_count; |
1993 | int ret, i; |
1994 | |
1995 | if (!val_count) |
1996 | return -EINVAL; |
1997 | |
1998 | if (map->use_single_write) |
1999 | chunk_regs = 1; |
2000 | else if (map->max_raw_write && val_len > map->max_raw_write) |
2001 | chunk_regs = map->max_raw_write / val_bytes; |
2002 | |
2003 | chunk_count = val_count / chunk_regs; |
2004 | chunk_bytes = chunk_regs * val_bytes; |
2005 | |
2006 | /* Write as many bytes as possible with chunk_size */ |
2007 | for (i = 0; i < chunk_count; i++) { |
2008 | ret = _regmap_raw_write_impl(map, reg, val, val_len: chunk_bytes, noinc); |
2009 | if (ret) |
2010 | return ret; |
2011 | |
2012 | reg += regmap_get_offset(map, index: chunk_regs); |
2013 | val += chunk_bytes; |
2014 | val_len -= chunk_bytes; |
2015 | } |
2016 | |
2017 | /* Write remaining bytes */ |
2018 | if (val_len) |
2019 | ret = _regmap_raw_write_impl(map, reg, val, val_len, noinc); |
2020 | |
2021 | return ret; |
2022 | } |
2023 | |
2024 | /** |
2025 | * regmap_raw_write() - Write raw values to one or more registers |
2026 | * |
2027 | * @map: Register map to write to |
2028 | * @reg: Initial register to write to |
2029 | * @val: Block of data to be written, laid out for direct transmission to the |
2030 | * device |
2031 | * @val_len: Length of data pointed to by val. |
2032 | * |
2033 | * This function is intended to be used for things like firmware |
2034 | * download where a large block of data needs to be transferred to the |
2035 | * device. No formatting will be done on the data provided. |
2036 | * |
2037 | * A value of zero will be returned on success, a negative errno will |
2038 | * be returned in error cases. |
2039 | */ |
2040 | int regmap_raw_write(struct regmap *map, unsigned int reg, |
2041 | const void *val, size_t val_len) |
2042 | { |
2043 | int ret; |
2044 | |
2045 | if (!regmap_can_raw_write(map)) |
2046 | return -EINVAL; |
2047 | if (val_len % map->format.val_bytes) |
2048 | return -EINVAL; |
2049 | |
2050 | map->lock(map->lock_arg); |
2051 | |
2052 | ret = _regmap_raw_write(map, reg, val, val_len, noinc: false); |
2053 | |
2054 | map->unlock(map->lock_arg); |
2055 | |
2056 | return ret; |
2057 | } |
2058 | EXPORT_SYMBOL_GPL(regmap_raw_write); |
2059 | |
2060 | static int regmap_noinc_readwrite(struct regmap *map, unsigned int reg, |
2061 | void *val, unsigned int val_len, bool write) |
2062 | { |
2063 | size_t val_bytes = map->format.val_bytes; |
2064 | size_t val_count = val_len / val_bytes; |
2065 | unsigned int lastval; |
2066 | u8 *u8p; |
2067 | u16 *u16p; |
2068 | u32 *u32p; |
2069 | int ret; |
2070 | int i; |
2071 | |
2072 | switch (val_bytes) { |
2073 | case 1: |
2074 | u8p = val; |
2075 | if (write) |
2076 | lastval = (unsigned int)u8p[val_count - 1]; |
2077 | break; |
2078 | case 2: |
2079 | u16p = val; |
2080 | if (write) |
2081 | lastval = (unsigned int)u16p[val_count - 1]; |
2082 | break; |
2083 | case 4: |
2084 | u32p = val; |
2085 | if (write) |
2086 | lastval = (unsigned int)u32p[val_count - 1]; |
2087 | break; |
2088 | default: |
2089 | return -EINVAL; |
2090 | } |
2091 | |
2092 | /* |
2093 | * Update the cache with the last value we write, the rest is just |
2094 | * gone down in the hardware FIFO. We can't cache FIFOs. This makes |
2095 | * sure a single read from the cache will work. |
2096 | */ |
2097 | if (write) { |
2098 | if (!map->cache_bypass && !map->defer_caching) { |
2099 | ret = regcache_write(map, reg, value: lastval); |
2100 | if (ret != 0) |
2101 | return ret; |
2102 | if (map->cache_only) { |
2103 | map->cache_dirty = true; |
2104 | return 0; |
2105 | } |
2106 | } |
2107 | ret = map->bus->reg_noinc_write(map->bus_context, reg, val, val_count); |
2108 | } else { |
2109 | ret = map->bus->reg_noinc_read(map->bus_context, reg, val, val_count); |
2110 | } |
2111 | |
2112 | if (!ret && regmap_should_log(map)) { |
2113 | dev_info(map->dev, "%x %s [" , reg, write ? "<=" : "=>" ); |
2114 | for (i = 0; i < val_count; i++) { |
2115 | switch (val_bytes) { |
2116 | case 1: |
2117 | pr_cont("%x" , u8p[i]); |
2118 | break; |
2119 | case 2: |
2120 | pr_cont("%x" , u16p[i]); |
2121 | break; |
2122 | case 4: |
2123 | pr_cont("%x" , u32p[i]); |
2124 | break; |
2125 | default: |
2126 | break; |
2127 | } |
2128 | if (i == (val_count - 1)) |
2129 | pr_cont("]\n" ); |
2130 | else |
2131 | pr_cont("," ); |
2132 | } |
2133 | } |
2134 | |
2135 | return 0; |
2136 | } |
2137 | |
2138 | /** |
2139 | * regmap_noinc_write(): Write data from a register without incrementing the |
2140 | * register number |
2141 | * |
2142 | * @map: Register map to write to |
2143 | * @reg: Register to write to |
2144 | * @val: Pointer to data buffer |
2145 | * @val_len: Length of output buffer in bytes. |
2146 | * |
2147 | * The regmap API usually assumes that bulk bus write operations will write a |
2148 | * range of registers. Some devices have certain registers for which a write |
2149 | * operation can write to an internal FIFO. |
2150 | * |
2151 | * The target register must be volatile but registers after it can be |
2152 | * completely unrelated cacheable registers. |
2153 | * |
2154 | * This will attempt multiple writes as required to write val_len bytes. |
2155 | * |
2156 | * A value of zero will be returned on success, a negative errno will be |
2157 | * returned in error cases. |
2158 | */ |
2159 | int regmap_noinc_write(struct regmap *map, unsigned int reg, |
2160 | const void *val, size_t val_len) |
2161 | { |
2162 | size_t write_len; |
2163 | int ret; |
2164 | |
2165 | if (!map->write && !(map->bus && map->bus->reg_noinc_write)) |
2166 | return -EINVAL; |
2167 | if (val_len % map->format.val_bytes) |
2168 | return -EINVAL; |
2169 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2170 | return -EINVAL; |
2171 | if (val_len == 0) |
2172 | return -EINVAL; |
2173 | |
2174 | map->lock(map->lock_arg); |
2175 | |
2176 | if (!regmap_volatile(map, reg) || !regmap_writeable_noinc(map, reg)) { |
2177 | ret = -EINVAL; |
2178 | goto out_unlock; |
2179 | } |
2180 | |
2181 | /* |
2182 | * Use the accelerated operation if we can. The val drops the const |
2183 | * typing in order to facilitate code reuse in regmap_noinc_readwrite(). |
2184 | */ |
2185 | if (map->bus->reg_noinc_write) { |
2186 | ret = regmap_noinc_readwrite(map, reg, val: (void *)val, val_len, write: true); |
2187 | goto out_unlock; |
2188 | } |
2189 | |
2190 | while (val_len) { |
2191 | if (map->max_raw_write && map->max_raw_write < val_len) |
2192 | write_len = map->max_raw_write; |
2193 | else |
2194 | write_len = val_len; |
2195 | ret = _regmap_raw_write(map, reg, val, val_len: write_len, noinc: true); |
2196 | if (ret) |
2197 | goto out_unlock; |
2198 | val = ((u8 *)val) + write_len; |
2199 | val_len -= write_len; |
2200 | } |
2201 | |
2202 | out_unlock: |
2203 | map->unlock(map->lock_arg); |
2204 | return ret; |
2205 | } |
2206 | EXPORT_SYMBOL_GPL(regmap_noinc_write); |
2207 | |
2208 | /** |
2209 | * regmap_field_update_bits_base() - Perform a read/modify/write cycle a |
2210 | * register field. |
2211 | * |
2212 | * @field: Register field to write to |
2213 | * @mask: Bitmask to change |
2214 | * @val: Value to be written |
2215 | * @change: Boolean indicating if a write was done |
2216 | * @async: Boolean indicating asynchronously |
2217 | * @force: Boolean indicating use force update |
2218 | * |
2219 | * Perform a read/modify/write cycle on the register field with change, |
2220 | * async, force option. |
2221 | * |
2222 | * A value of zero will be returned on success, a negative errno will |
2223 | * be returned in error cases. |
2224 | */ |
2225 | int regmap_field_update_bits_base(struct regmap_field *field, |
2226 | unsigned int mask, unsigned int val, |
2227 | bool *change, bool async, bool force) |
2228 | { |
2229 | mask = (mask << field->shift) & field->mask; |
2230 | |
2231 | return regmap_update_bits_base(map: field->regmap, reg: field->reg, |
2232 | mask, val: val << field->shift, |
2233 | change, async, force); |
2234 | } |
2235 | EXPORT_SYMBOL_GPL(regmap_field_update_bits_base); |
2236 | |
2237 | /** |
2238 | * regmap_field_test_bits() - Check if all specified bits are set in a |
2239 | * register field. |
2240 | * |
2241 | * @field: Register field to operate on |
2242 | * @bits: Bits to test |
2243 | * |
2244 | * Returns -1 if the underlying regmap_field_read() fails, 0 if at least one of the |
2245 | * tested bits is not set and 1 if all tested bits are set. |
2246 | */ |
2247 | int regmap_field_test_bits(struct regmap_field *field, unsigned int bits) |
2248 | { |
2249 | unsigned int val, ret; |
2250 | |
2251 | ret = regmap_field_read(field, val: &val); |
2252 | if (ret) |
2253 | return ret; |
2254 | |
2255 | return (val & bits) == bits; |
2256 | } |
2257 | EXPORT_SYMBOL_GPL(regmap_field_test_bits); |
2258 | |
2259 | /** |
2260 | * regmap_fields_update_bits_base() - Perform a read/modify/write cycle a |
2261 | * register field with port ID |
2262 | * |
2263 | * @field: Register field to write to |
2264 | * @id: port ID |
2265 | * @mask: Bitmask to change |
2266 | * @val: Value to be written |
2267 | * @change: Boolean indicating if a write was done |
2268 | * @async: Boolean indicating asynchronously |
2269 | * @force: Boolean indicating use force update |
2270 | * |
2271 | * A value of zero will be returned on success, a negative errno will |
2272 | * be returned in error cases. |
2273 | */ |
2274 | int regmap_fields_update_bits_base(struct regmap_field *field, unsigned int id, |
2275 | unsigned int mask, unsigned int val, |
2276 | bool *change, bool async, bool force) |
2277 | { |
2278 | if (id >= field->id_size) |
2279 | return -EINVAL; |
2280 | |
2281 | mask = (mask << field->shift) & field->mask; |
2282 | |
2283 | return regmap_update_bits_base(map: field->regmap, |
2284 | reg: field->reg + (field->id_offset * id), |
2285 | mask, val: val << field->shift, |
2286 | change, async, force); |
2287 | } |
2288 | EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base); |
2289 | |
2290 | /** |
2291 | * regmap_bulk_write() - Write multiple registers to the device |
2292 | * |
2293 | * @map: Register map to write to |
2294 | * @reg: First register to be write from |
2295 | * @val: Block of data to be written, in native register size for device |
2296 | * @val_count: Number of registers to write |
2297 | * |
2298 | * This function is intended to be used for writing a large block of |
2299 | * data to the device either in single transfer or multiple transfer. |
2300 | * |
2301 | * A value of zero will be returned on success, a negative errno will |
2302 | * be returned in error cases. |
2303 | */ |
2304 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, |
2305 | size_t val_count) |
2306 | { |
2307 | int ret = 0, i; |
2308 | size_t val_bytes = map->format.val_bytes; |
2309 | |
2310 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2311 | return -EINVAL; |
2312 | |
2313 | /* |
2314 | * Some devices don't support bulk write, for them we have a series of |
2315 | * single write operations. |
2316 | */ |
2317 | if (!map->write || !map->format.parse_inplace) { |
2318 | map->lock(map->lock_arg); |
2319 | for (i = 0; i < val_count; i++) { |
2320 | unsigned int ival; |
2321 | |
2322 | switch (val_bytes) { |
2323 | case 1: |
2324 | ival = *(u8 *)(val + (i * val_bytes)); |
2325 | break; |
2326 | case 2: |
2327 | ival = *(u16 *)(val + (i * val_bytes)); |
2328 | break; |
2329 | case 4: |
2330 | ival = *(u32 *)(val + (i * val_bytes)); |
2331 | break; |
2332 | default: |
2333 | ret = -EINVAL; |
2334 | goto out; |
2335 | } |
2336 | |
2337 | ret = _regmap_write(map, |
2338 | reg: reg + regmap_get_offset(map, index: i), |
2339 | val: ival); |
2340 | if (ret != 0) |
2341 | goto out; |
2342 | } |
2343 | out: |
2344 | map->unlock(map->lock_arg); |
2345 | } else { |
2346 | void *wval; |
2347 | |
2348 | wval = kmemdup(p: val, size: val_count * val_bytes, gfp: map->alloc_flags); |
2349 | if (!wval) |
2350 | return -ENOMEM; |
2351 | |
2352 | for (i = 0; i < val_count * val_bytes; i += val_bytes) |
2353 | map->format.parse_inplace(wval + i); |
2354 | |
2355 | ret = regmap_raw_write(map, reg, wval, val_bytes * val_count); |
2356 | |
2357 | kfree(objp: wval); |
2358 | } |
2359 | |
2360 | if (!ret) |
2361 | trace_regmap_bulk_write(map, reg, val, val_len: val_bytes * val_count); |
2362 | |
2363 | return ret; |
2364 | } |
2365 | EXPORT_SYMBOL_GPL(regmap_bulk_write); |
2366 | |
2367 | /* |
2368 | * _regmap_raw_multi_reg_write() |
2369 | * |
2370 | * the (register,newvalue) pairs in regs have not been formatted, but |
2371 | * they are all in the same page and have been changed to being page |
2372 | * relative. The page register has been written if that was necessary. |
2373 | */ |
2374 | static int _regmap_raw_multi_reg_write(struct regmap *map, |
2375 | const struct reg_sequence *regs, |
2376 | size_t num_regs) |
2377 | { |
2378 | int ret; |
2379 | void *buf; |
2380 | int i; |
2381 | u8 *u8; |
2382 | size_t val_bytes = map->format.val_bytes; |
2383 | size_t reg_bytes = map->format.reg_bytes; |
2384 | size_t pad_bytes = map->format.pad_bytes; |
2385 | size_t pair_size = reg_bytes + pad_bytes + val_bytes; |
2386 | size_t len = pair_size * num_regs; |
2387 | |
2388 | if (!len) |
2389 | return -EINVAL; |
2390 | |
2391 | buf = kzalloc(size: len, GFP_KERNEL); |
2392 | if (!buf) |
2393 | return -ENOMEM; |
2394 | |
2395 | /* We have to linearise by hand. */ |
2396 | |
2397 | u8 = buf; |
2398 | |
2399 | for (i = 0; i < num_regs; i++) { |
2400 | unsigned int reg = regs[i].reg; |
2401 | unsigned int val = regs[i].def; |
2402 | trace_regmap_hw_write_start(map, reg, count: 1); |
2403 | reg = regmap_reg_addr(map, reg); |
2404 | map->format.format_reg(u8, reg, map->reg_shift); |
2405 | u8 += reg_bytes + pad_bytes; |
2406 | map->format.format_val(u8, val, 0); |
2407 | u8 += val_bytes; |
2408 | } |
2409 | u8 = buf; |
2410 | *u8 |= map->write_flag_mask; |
2411 | |
2412 | ret = map->write(map->bus_context, buf, len); |
2413 | |
2414 | kfree(objp: buf); |
2415 | |
2416 | for (i = 0; i < num_regs; i++) { |
2417 | int reg = regs[i].reg; |
2418 | trace_regmap_hw_write_done(map, reg, count: 1); |
2419 | } |
2420 | return ret; |
2421 | } |
2422 | |
2423 | static unsigned int _regmap_register_page(struct regmap *map, |
2424 | unsigned int reg, |
2425 | struct regmap_range_node *range) |
2426 | { |
2427 | unsigned int win_page = (reg - range->range_min) / range->window_len; |
2428 | |
2429 | return win_page; |
2430 | } |
2431 | |
2432 | static int _regmap_range_multi_paged_reg_write(struct regmap *map, |
2433 | struct reg_sequence *regs, |
2434 | size_t num_regs) |
2435 | { |
2436 | int ret; |
2437 | int i, n; |
2438 | struct reg_sequence *base; |
2439 | unsigned int this_page = 0; |
2440 | unsigned int page_change = 0; |
2441 | /* |
2442 | * the set of registers are not neccessarily in order, but |
2443 | * since the order of write must be preserved this algorithm |
2444 | * chops the set each time the page changes. This also applies |
2445 | * if there is a delay required at any point in the sequence. |
2446 | */ |
2447 | base = regs; |
2448 | for (i = 0, n = 0; i < num_regs; i++, n++) { |
2449 | unsigned int reg = regs[i].reg; |
2450 | struct regmap_range_node *range; |
2451 | |
2452 | range = _regmap_range_lookup(map, reg); |
2453 | if (range) { |
2454 | unsigned int win_page = _regmap_register_page(map, reg, |
2455 | range); |
2456 | |
2457 | if (i == 0) |
2458 | this_page = win_page; |
2459 | if (win_page != this_page) { |
2460 | this_page = win_page; |
2461 | page_change = 1; |
2462 | } |
2463 | } |
2464 | |
2465 | /* If we have both a page change and a delay make sure to |
2466 | * write the regs and apply the delay before we change the |
2467 | * page. |
2468 | */ |
2469 | |
2470 | if (page_change || regs[i].delay_us) { |
2471 | |
2472 | /* For situations where the first write requires |
2473 | * a delay we need to make sure we don't call |
2474 | * raw_multi_reg_write with n=0 |
2475 | * This can't occur with page breaks as we |
2476 | * never write on the first iteration |
2477 | */ |
2478 | if (regs[i].delay_us && i == 0) |
2479 | n = 1; |
2480 | |
2481 | ret = _regmap_raw_multi_reg_write(map, regs: base, num_regs: n); |
2482 | if (ret != 0) |
2483 | return ret; |
2484 | |
2485 | if (regs[i].delay_us) { |
2486 | if (map->can_sleep) |
2487 | fsleep(usecs: regs[i].delay_us); |
2488 | else |
2489 | udelay(regs[i].delay_us); |
2490 | } |
2491 | |
2492 | base += n; |
2493 | n = 0; |
2494 | |
2495 | if (page_change) { |
2496 | ret = _regmap_select_page(map, |
2497 | reg: &base[n].reg, |
2498 | range, val_num: 1); |
2499 | if (ret != 0) |
2500 | return ret; |
2501 | |
2502 | page_change = 0; |
2503 | } |
2504 | |
2505 | } |
2506 | |
2507 | } |
2508 | if (n > 0) |
2509 | return _regmap_raw_multi_reg_write(map, regs: base, num_regs: n); |
2510 | return 0; |
2511 | } |
2512 | |
2513 | static int _regmap_multi_reg_write(struct regmap *map, |
2514 | const struct reg_sequence *regs, |
2515 | size_t num_regs) |
2516 | { |
2517 | int i; |
2518 | int ret; |
2519 | |
2520 | if (!map->can_multi_write) { |
2521 | for (i = 0; i < num_regs; i++) { |
2522 | ret = _regmap_write(map, reg: regs[i].reg, val: regs[i].def); |
2523 | if (ret != 0) |
2524 | return ret; |
2525 | |
2526 | if (regs[i].delay_us) { |
2527 | if (map->can_sleep) |
2528 | fsleep(usecs: regs[i].delay_us); |
2529 | else |
2530 | udelay(regs[i].delay_us); |
2531 | } |
2532 | } |
2533 | return 0; |
2534 | } |
2535 | |
2536 | if (!map->format.parse_inplace) |
2537 | return -EINVAL; |
2538 | |
2539 | if (map->writeable_reg) |
2540 | for (i = 0; i < num_regs; i++) { |
2541 | int reg = regs[i].reg; |
2542 | if (!map->writeable_reg(map->dev, reg)) |
2543 | return -EINVAL; |
2544 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2545 | return -EINVAL; |
2546 | } |
2547 | |
2548 | if (!map->cache_bypass) { |
2549 | for (i = 0; i < num_regs; i++) { |
2550 | unsigned int val = regs[i].def; |
2551 | unsigned int reg = regs[i].reg; |
2552 | ret = regcache_write(map, reg, value: val); |
2553 | if (ret) { |
2554 | dev_err(map->dev, |
2555 | "Error in caching of register: %x ret: %d\n" , |
2556 | reg, ret); |
2557 | return ret; |
2558 | } |
2559 | } |
2560 | if (map->cache_only) { |
2561 | map->cache_dirty = true; |
2562 | return 0; |
2563 | } |
2564 | } |
2565 | |
2566 | WARN_ON(!map->bus); |
2567 | |
2568 | for (i = 0; i < num_regs; i++) { |
2569 | unsigned int reg = regs[i].reg; |
2570 | struct regmap_range_node *range; |
2571 | |
2572 | /* Coalesce all the writes between a page break or a delay |
2573 | * in a sequence |
2574 | */ |
2575 | range = _regmap_range_lookup(map, reg); |
2576 | if (range || regs[i].delay_us) { |
2577 | size_t len = sizeof(struct reg_sequence)*num_regs; |
2578 | struct reg_sequence *base = kmemdup(p: regs, size: len, |
2579 | GFP_KERNEL); |
2580 | if (!base) |
2581 | return -ENOMEM; |
2582 | ret = _regmap_range_multi_paged_reg_write(map, regs: base, |
2583 | num_regs); |
2584 | kfree(objp: base); |
2585 | |
2586 | return ret; |
2587 | } |
2588 | } |
2589 | return _regmap_raw_multi_reg_write(map, regs, num_regs); |
2590 | } |
2591 | |
2592 | /** |
2593 | * regmap_multi_reg_write() - Write multiple registers to the device |
2594 | * |
2595 | * @map: Register map to write to |
2596 | * @regs: Array of structures containing register,value to be written |
2597 | * @num_regs: Number of registers to write |
2598 | * |
2599 | * Write multiple registers to the device where the set of register, value |
2600 | * pairs are supplied in any order, possibly not all in a single range. |
2601 | * |
2602 | * The 'normal' block write mode will send ultimately send data on the |
2603 | * target bus as R,V1,V2,V3,..,Vn where successively higher registers are |
2604 | * addressed. However, this alternative block multi write mode will send |
2605 | * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device |
2606 | * must of course support the mode. |
2607 | * |
2608 | * A value of zero will be returned on success, a negative errno will be |
2609 | * returned in error cases. |
2610 | */ |
2611 | int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs, |
2612 | int num_regs) |
2613 | { |
2614 | int ret; |
2615 | |
2616 | map->lock(map->lock_arg); |
2617 | |
2618 | ret = _regmap_multi_reg_write(map, regs, num_regs); |
2619 | |
2620 | map->unlock(map->lock_arg); |
2621 | |
2622 | return ret; |
2623 | } |
2624 | EXPORT_SYMBOL_GPL(regmap_multi_reg_write); |
2625 | |
2626 | /** |
2627 | * regmap_multi_reg_write_bypassed() - Write multiple registers to the |
2628 | * device but not the cache |
2629 | * |
2630 | * @map: Register map to write to |
2631 | * @regs: Array of structures containing register,value to be written |
2632 | * @num_regs: Number of registers to write |
2633 | * |
2634 | * Write multiple registers to the device but not the cache where the set |
2635 | * of register are supplied in any order. |
2636 | * |
2637 | * This function is intended to be used for writing a large block of data |
2638 | * atomically to the device in single transfer for those I2C client devices |
2639 | * that implement this alternative block write mode. |
2640 | * |
2641 | * A value of zero will be returned on success, a negative errno will |
2642 | * be returned in error cases. |
2643 | */ |
2644 | int regmap_multi_reg_write_bypassed(struct regmap *map, |
2645 | const struct reg_sequence *regs, |
2646 | int num_regs) |
2647 | { |
2648 | int ret; |
2649 | bool bypass; |
2650 | |
2651 | map->lock(map->lock_arg); |
2652 | |
2653 | bypass = map->cache_bypass; |
2654 | map->cache_bypass = true; |
2655 | |
2656 | ret = _regmap_multi_reg_write(map, regs, num_regs); |
2657 | |
2658 | map->cache_bypass = bypass; |
2659 | |
2660 | map->unlock(map->lock_arg); |
2661 | |
2662 | return ret; |
2663 | } |
2664 | EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed); |
2665 | |
2666 | /** |
2667 | * regmap_raw_write_async() - Write raw values to one or more registers |
2668 | * asynchronously |
2669 | * |
2670 | * @map: Register map to write to |
2671 | * @reg: Initial register to write to |
2672 | * @val: Block of data to be written, laid out for direct transmission to the |
2673 | * device. Must be valid until regmap_async_complete() is called. |
2674 | * @val_len: Length of data pointed to by val. |
2675 | * |
2676 | * This function is intended to be used for things like firmware |
2677 | * download where a large block of data needs to be transferred to the |
2678 | * device. No formatting will be done on the data provided. |
2679 | * |
2680 | * If supported by the underlying bus the write will be scheduled |
2681 | * asynchronously, helping maximise I/O speed on higher speed buses |
2682 | * like SPI. regmap_async_complete() can be called to ensure that all |
2683 | * asynchrnous writes have been completed. |
2684 | * |
2685 | * A value of zero will be returned on success, a negative errno will |
2686 | * be returned in error cases. |
2687 | */ |
2688 | int regmap_raw_write_async(struct regmap *map, unsigned int reg, |
2689 | const void *val, size_t val_len) |
2690 | { |
2691 | int ret; |
2692 | |
2693 | if (val_len % map->format.val_bytes) |
2694 | return -EINVAL; |
2695 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2696 | return -EINVAL; |
2697 | |
2698 | map->lock(map->lock_arg); |
2699 | |
2700 | map->async = true; |
2701 | |
2702 | ret = _regmap_raw_write(map, reg, val, val_len, noinc: false); |
2703 | |
2704 | map->async = false; |
2705 | |
2706 | map->unlock(map->lock_arg); |
2707 | |
2708 | return ret; |
2709 | } |
2710 | EXPORT_SYMBOL_GPL(regmap_raw_write_async); |
2711 | |
2712 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
2713 | unsigned int val_len, bool noinc) |
2714 | { |
2715 | struct regmap_range_node *range; |
2716 | int ret; |
2717 | |
2718 | if (!map->read) |
2719 | return -EINVAL; |
2720 | |
2721 | range = _regmap_range_lookup(map, reg); |
2722 | if (range) { |
2723 | ret = _regmap_select_page(map, reg: ®, range, |
2724 | val_num: noinc ? 1 : val_len / map->format.val_bytes); |
2725 | if (ret != 0) |
2726 | return ret; |
2727 | } |
2728 | |
2729 | reg = regmap_reg_addr(map, reg); |
2730 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
2731 | regmap_set_work_buf_flag_mask(map, max_bytes: map->format.reg_bytes, |
2732 | mask: map->read_flag_mask); |
2733 | trace_regmap_hw_read_start(map, reg, count: val_len / map->format.val_bytes); |
2734 | |
2735 | ret = map->read(map->bus_context, map->work_buf, |
2736 | map->format.reg_bytes + map->format.pad_bytes, |
2737 | val, val_len); |
2738 | |
2739 | trace_regmap_hw_read_done(map, reg, count: val_len / map->format.val_bytes); |
2740 | |
2741 | return ret; |
2742 | } |
2743 | |
2744 | static int _regmap_bus_reg_read(void *context, unsigned int reg, |
2745 | unsigned int *val) |
2746 | { |
2747 | struct regmap *map = context; |
2748 | struct regmap_range_node *range; |
2749 | int ret; |
2750 | |
2751 | range = _regmap_range_lookup(map, reg); |
2752 | if (range) { |
2753 | ret = _regmap_select_page(map, reg: ®, range, val_num: 1); |
2754 | if (ret != 0) |
2755 | return ret; |
2756 | } |
2757 | |
2758 | reg = regmap_reg_addr(map, reg); |
2759 | return map->bus->reg_read(map->bus_context, reg, val); |
2760 | } |
2761 | |
2762 | static int _regmap_bus_read(void *context, unsigned int reg, |
2763 | unsigned int *val) |
2764 | { |
2765 | int ret; |
2766 | struct regmap *map = context; |
2767 | void *work_val = map->work_buf + map->format.reg_bytes + |
2768 | map->format.pad_bytes; |
2769 | |
2770 | if (!map->format.parse_val) |
2771 | return -EINVAL; |
2772 | |
2773 | ret = _regmap_raw_read(map, reg, val: work_val, val_len: map->format.val_bytes, noinc: false); |
2774 | if (ret == 0) |
2775 | *val = map->format.parse_val(work_val); |
2776 | |
2777 | return ret; |
2778 | } |
2779 | |
2780 | static int _regmap_read(struct regmap *map, unsigned int reg, |
2781 | unsigned int *val) |
2782 | { |
2783 | int ret; |
2784 | void *context = _regmap_map_get_context(map); |
2785 | |
2786 | if (!map->cache_bypass) { |
2787 | ret = regcache_read(map, reg, value: val); |
2788 | if (ret == 0) |
2789 | return 0; |
2790 | } |
2791 | |
2792 | if (map->cache_only) |
2793 | return -EBUSY; |
2794 | |
2795 | if (!regmap_readable(map, reg)) |
2796 | return -EIO; |
2797 | |
2798 | ret = map->reg_read(context, reg, val); |
2799 | if (ret == 0) { |
2800 | if (regmap_should_log(map)) |
2801 | dev_info(map->dev, "%x => %x\n" , reg, *val); |
2802 | |
2803 | trace_regmap_reg_read(map, reg, val: *val); |
2804 | |
2805 | if (!map->cache_bypass) |
2806 | regcache_write(map, reg, value: *val); |
2807 | } |
2808 | |
2809 | return ret; |
2810 | } |
2811 | |
2812 | /** |
2813 | * regmap_read() - Read a value from a single register |
2814 | * |
2815 | * @map: Register map to read from |
2816 | * @reg: Register to be read from |
2817 | * @val: Pointer to store read value |
2818 | * |
2819 | * A value of zero will be returned on success, a negative errno will |
2820 | * be returned in error cases. |
2821 | */ |
2822 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) |
2823 | { |
2824 | int ret; |
2825 | |
2826 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2827 | return -EINVAL; |
2828 | |
2829 | map->lock(map->lock_arg); |
2830 | |
2831 | ret = _regmap_read(map, reg, val); |
2832 | |
2833 | map->unlock(map->lock_arg); |
2834 | |
2835 | return ret; |
2836 | } |
2837 | EXPORT_SYMBOL_GPL(regmap_read); |
2838 | |
2839 | /** |
2840 | * regmap_raw_read() - Read raw data from the device |
2841 | * |
2842 | * @map: Register map to read from |
2843 | * @reg: First register to be read from |
2844 | * @val: Pointer to store read value |
2845 | * @val_len: Size of data to read |
2846 | * |
2847 | * A value of zero will be returned on success, a negative errno will |
2848 | * be returned in error cases. |
2849 | */ |
2850 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
2851 | size_t val_len) |
2852 | { |
2853 | size_t val_bytes = map->format.val_bytes; |
2854 | size_t val_count = val_len / val_bytes; |
2855 | unsigned int v; |
2856 | int ret, i; |
2857 | |
2858 | if (val_len % map->format.val_bytes) |
2859 | return -EINVAL; |
2860 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2861 | return -EINVAL; |
2862 | if (val_count == 0) |
2863 | return -EINVAL; |
2864 | |
2865 | map->lock(map->lock_arg); |
2866 | |
2867 | if (regmap_volatile_range(map, reg, num: val_count) || map->cache_bypass || |
2868 | map->cache_type == REGCACHE_NONE) { |
2869 | size_t chunk_count, chunk_bytes; |
2870 | size_t chunk_regs = val_count; |
2871 | |
2872 | if (!map->cache_bypass && map->cache_only) { |
2873 | ret = -EBUSY; |
2874 | goto out; |
2875 | } |
2876 | |
2877 | if (!map->read) { |
2878 | ret = -ENOTSUPP; |
2879 | goto out; |
2880 | } |
2881 | |
2882 | if (map->use_single_read) |
2883 | chunk_regs = 1; |
2884 | else if (map->max_raw_read && val_len > map->max_raw_read) |
2885 | chunk_regs = map->max_raw_read / val_bytes; |
2886 | |
2887 | chunk_count = val_count / chunk_regs; |
2888 | chunk_bytes = chunk_regs * val_bytes; |
2889 | |
2890 | /* Read bytes that fit into whole chunks */ |
2891 | for (i = 0; i < chunk_count; i++) { |
2892 | ret = _regmap_raw_read(map, reg, val, val_len: chunk_bytes, noinc: false); |
2893 | if (ret != 0) |
2894 | goto out; |
2895 | |
2896 | reg += regmap_get_offset(map, index: chunk_regs); |
2897 | val += chunk_bytes; |
2898 | val_len -= chunk_bytes; |
2899 | } |
2900 | |
2901 | /* Read remaining bytes */ |
2902 | if (val_len) { |
2903 | ret = _regmap_raw_read(map, reg, val, val_len, noinc: false); |
2904 | if (ret != 0) |
2905 | goto out; |
2906 | } |
2907 | } else { |
2908 | /* Otherwise go word by word for the cache; should be low |
2909 | * cost as we expect to hit the cache. |
2910 | */ |
2911 | for (i = 0; i < val_count; i++) { |
2912 | ret = _regmap_read(map, reg: reg + regmap_get_offset(map, index: i), |
2913 | val: &v); |
2914 | if (ret != 0) |
2915 | goto out; |
2916 | |
2917 | map->format.format_val(val + (i * val_bytes), v, 0); |
2918 | } |
2919 | } |
2920 | |
2921 | out: |
2922 | map->unlock(map->lock_arg); |
2923 | |
2924 | return ret; |
2925 | } |
2926 | EXPORT_SYMBOL_GPL(regmap_raw_read); |
2927 | |
2928 | /** |
2929 | * regmap_noinc_read(): Read data from a register without incrementing the |
2930 | * register number |
2931 | * |
2932 | * @map: Register map to read from |
2933 | * @reg: Register to read from |
2934 | * @val: Pointer to data buffer |
2935 | * @val_len: Length of output buffer in bytes. |
2936 | * |
2937 | * The regmap API usually assumes that bulk read operations will read a |
2938 | * range of registers. Some devices have certain registers for which a read |
2939 | * operation read will read from an internal FIFO. |
2940 | * |
2941 | * The target register must be volatile but registers after it can be |
2942 | * completely unrelated cacheable registers. |
2943 | * |
2944 | * This will attempt multiple reads as required to read val_len bytes. |
2945 | * |
2946 | * A value of zero will be returned on success, a negative errno will be |
2947 | * returned in error cases. |
2948 | */ |
2949 | int regmap_noinc_read(struct regmap *map, unsigned int reg, |
2950 | void *val, size_t val_len) |
2951 | { |
2952 | size_t read_len; |
2953 | int ret; |
2954 | |
2955 | if (!map->read) |
2956 | return -ENOTSUPP; |
2957 | |
2958 | if (val_len % map->format.val_bytes) |
2959 | return -EINVAL; |
2960 | if (!IS_ALIGNED(reg, map->reg_stride)) |
2961 | return -EINVAL; |
2962 | if (val_len == 0) |
2963 | return -EINVAL; |
2964 | |
2965 | map->lock(map->lock_arg); |
2966 | |
2967 | if (!regmap_volatile(map, reg) || !regmap_readable_noinc(map, reg)) { |
2968 | ret = -EINVAL; |
2969 | goto out_unlock; |
2970 | } |
2971 | |
2972 | /* |
2973 | * We have not defined the FIFO semantics for cache, as the |
2974 | * cache is just one value deep. Should we return the last |
2975 | * written value? Just avoid this by always reading the FIFO |
2976 | * even when using cache. Cache only will not work. |
2977 | */ |
2978 | if (!map->cache_bypass && map->cache_only) { |
2979 | ret = -EBUSY; |
2980 | goto out_unlock; |
2981 | } |
2982 | |
2983 | /* Use the accelerated operation if we can */ |
2984 | if (map->bus->reg_noinc_read) { |
2985 | ret = regmap_noinc_readwrite(map, reg, val, val_len, write: false); |
2986 | goto out_unlock; |
2987 | } |
2988 | |
2989 | while (val_len) { |
2990 | if (map->max_raw_read && map->max_raw_read < val_len) |
2991 | read_len = map->max_raw_read; |
2992 | else |
2993 | read_len = val_len; |
2994 | ret = _regmap_raw_read(map, reg, val, val_len: read_len, noinc: true); |
2995 | if (ret) |
2996 | goto out_unlock; |
2997 | val = ((u8 *)val) + read_len; |
2998 | val_len -= read_len; |
2999 | } |
3000 | |
3001 | out_unlock: |
3002 | map->unlock(map->lock_arg); |
3003 | return ret; |
3004 | } |
3005 | EXPORT_SYMBOL_GPL(regmap_noinc_read); |
3006 | |
3007 | /** |
3008 | * regmap_field_read(): Read a value to a single register field |
3009 | * |
3010 | * @field: Register field to read from |
3011 | * @val: Pointer to store read value |
3012 | * |
3013 | * A value of zero will be returned on success, a negative errno will |
3014 | * be returned in error cases. |
3015 | */ |
3016 | int regmap_field_read(struct regmap_field *field, unsigned int *val) |
3017 | { |
3018 | int ret; |
3019 | unsigned int reg_val; |
3020 | ret = regmap_read(field->regmap, field->reg, ®_val); |
3021 | if (ret != 0) |
3022 | return ret; |
3023 | |
3024 | reg_val &= field->mask; |
3025 | reg_val >>= field->shift; |
3026 | *val = reg_val; |
3027 | |
3028 | return ret; |
3029 | } |
3030 | EXPORT_SYMBOL_GPL(regmap_field_read); |
3031 | |
3032 | /** |
3033 | * regmap_fields_read() - Read a value to a single register field with port ID |
3034 | * |
3035 | * @field: Register field to read from |
3036 | * @id: port ID |
3037 | * @val: Pointer to store read value |
3038 | * |
3039 | * A value of zero will be returned on success, a negative errno will |
3040 | * be returned in error cases. |
3041 | */ |
3042 | int regmap_fields_read(struct regmap_field *field, unsigned int id, |
3043 | unsigned int *val) |
3044 | { |
3045 | int ret; |
3046 | unsigned int reg_val; |
3047 | |
3048 | if (id >= field->id_size) |
3049 | return -EINVAL; |
3050 | |
3051 | ret = regmap_read(field->regmap, |
3052 | field->reg + (field->id_offset * id), |
3053 | ®_val); |
3054 | if (ret != 0) |
3055 | return ret; |
3056 | |
3057 | reg_val &= field->mask; |
3058 | reg_val >>= field->shift; |
3059 | *val = reg_val; |
3060 | |
3061 | return ret; |
3062 | } |
3063 | EXPORT_SYMBOL_GPL(regmap_fields_read); |
3064 | |
3065 | /** |
3066 | * regmap_bulk_read() - Read multiple registers from the device |
3067 | * |
3068 | * @map: Register map to read from |
3069 | * @reg: First register to be read from |
3070 | * @val: Pointer to store read value, in native register size for device |
3071 | * @val_count: Number of registers to read |
3072 | * |
3073 | * A value of zero will be returned on success, a negative errno will |
3074 | * be returned in error cases. |
3075 | */ |
3076 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, |
3077 | size_t val_count) |
3078 | { |
3079 | int ret, i; |
3080 | size_t val_bytes = map->format.val_bytes; |
3081 | bool vol = regmap_volatile_range(map, reg, num: val_count); |
3082 | |
3083 | if (!IS_ALIGNED(reg, map->reg_stride)) |
3084 | return -EINVAL; |
3085 | if (val_count == 0) |
3086 | return -EINVAL; |
3087 | |
3088 | if (map->read && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) { |
3089 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); |
3090 | if (ret != 0) |
3091 | return ret; |
3092 | |
3093 | for (i = 0; i < val_count * val_bytes; i += val_bytes) |
3094 | map->format.parse_inplace(val + i); |
3095 | } else { |
3096 | u32 *u32 = val; |
3097 | u16 *u16 = val; |
3098 | u8 *u8 = val; |
3099 | |
3100 | map->lock(map->lock_arg); |
3101 | |
3102 | for (i = 0; i < val_count; i++) { |
3103 | unsigned int ival; |
3104 | |
3105 | ret = _regmap_read(map, reg: reg + regmap_get_offset(map, index: i), |
3106 | val: &ival); |
3107 | if (ret != 0) |
3108 | goto out; |
3109 | |
3110 | switch (map->format.val_bytes) { |
3111 | case 4: |
3112 | u32[i] = ival; |
3113 | break; |
3114 | case 2: |
3115 | u16[i] = ival; |
3116 | break; |
3117 | case 1: |
3118 | u8[i] = ival; |
3119 | break; |
3120 | default: |
3121 | ret = -EINVAL; |
3122 | goto out; |
3123 | } |
3124 | } |
3125 | |
3126 | out: |
3127 | map->unlock(map->lock_arg); |
3128 | } |
3129 | |
3130 | if (!ret) |
3131 | trace_regmap_bulk_read(map, reg, val, val_len: val_bytes * val_count); |
3132 | |
3133 | return ret; |
3134 | } |
3135 | EXPORT_SYMBOL_GPL(regmap_bulk_read); |
3136 | |
3137 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
3138 | unsigned int mask, unsigned int val, |
3139 | bool *change, bool force_write) |
3140 | { |
3141 | int ret; |
3142 | unsigned int tmp, orig; |
3143 | |
3144 | if (change) |
3145 | *change = false; |
3146 | |
3147 | if (regmap_volatile(map, reg) && map->reg_update_bits) { |
3148 | reg = regmap_reg_addr(map, reg); |
3149 | ret = map->reg_update_bits(map->bus_context, reg, mask, val); |
3150 | if (ret == 0 && change) |
3151 | *change = true; |
3152 | } else { |
3153 | ret = _regmap_read(map, reg, val: &orig); |
3154 | if (ret != 0) |
3155 | return ret; |
3156 | |
3157 | tmp = orig & ~mask; |
3158 | tmp |= val & mask; |
3159 | |
3160 | if (force_write || (tmp != orig) || map->force_write_field) { |
3161 | ret = _regmap_write(map, reg, val: tmp); |
3162 | if (ret == 0 && change) |
3163 | *change = true; |
3164 | } |
3165 | } |
3166 | |
3167 | return ret; |
3168 | } |
3169 | |
3170 | /** |
3171 | * regmap_update_bits_base() - Perform a read/modify/write cycle on a register |
3172 | * |
3173 | * @map: Register map to update |
3174 | * @reg: Register to update |
3175 | * @mask: Bitmask to change |
3176 | * @val: New value for bitmask |
3177 | * @change: Boolean indicating if a write was done |
3178 | * @async: Boolean indicating asynchronously |
3179 | * @force: Boolean indicating use force update |
3180 | * |
3181 | * Perform a read/modify/write cycle on a register map with change, async, force |
3182 | * options. |
3183 | * |
3184 | * If async is true: |
3185 | * |
3186 | * With most buses the read must be done synchronously so this is most useful |
3187 | * for devices with a cache which do not need to interact with the hardware to |
3188 | * determine the current register value. |
3189 | * |
3190 | * Returns zero for success, a negative number on error. |
3191 | */ |
3192 | int regmap_update_bits_base(struct regmap *map, unsigned int reg, |
3193 | unsigned int mask, unsigned int val, |
3194 | bool *change, bool async, bool force) |
3195 | { |
3196 | int ret; |
3197 | |
3198 | map->lock(map->lock_arg); |
3199 | |
3200 | map->async = async; |
3201 | |
3202 | ret = _regmap_update_bits(map, reg, mask, val, change, force_write: force); |
3203 | |
3204 | map->async = false; |
3205 | |
3206 | map->unlock(map->lock_arg); |
3207 | |
3208 | return ret; |
3209 | } |
3210 | EXPORT_SYMBOL_GPL(regmap_update_bits_base); |
3211 | |
3212 | /** |
3213 | * regmap_test_bits() - Check if all specified bits are set in a register. |
3214 | * |
3215 | * @map: Register map to operate on |
3216 | * @reg: Register to read from |
3217 | * @bits: Bits to test |
3218 | * |
3219 | * Returns 0 if at least one of the tested bits is not set, 1 if all tested |
3220 | * bits are set and a negative error number if the underlying regmap_read() |
3221 | * fails. |
3222 | */ |
3223 | int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits) |
3224 | { |
3225 | unsigned int val, ret; |
3226 | |
3227 | ret = regmap_read(map, reg, &val); |
3228 | if (ret) |
3229 | return ret; |
3230 | |
3231 | return (val & bits) == bits; |
3232 | } |
3233 | EXPORT_SYMBOL_GPL(regmap_test_bits); |
3234 | |
3235 | void regmap_async_complete_cb(struct regmap_async *async, int ret) |
3236 | { |
3237 | struct regmap *map = async->map; |
3238 | bool wake; |
3239 | |
3240 | trace_regmap_async_io_complete(map); |
3241 | |
3242 | spin_lock(lock: &map->async_lock); |
3243 | list_move(list: &async->list, head: &map->async_free); |
3244 | wake = list_empty(head: &map->async_list); |
3245 | |
3246 | if (ret != 0) |
3247 | map->async_ret = ret; |
3248 | |
3249 | spin_unlock(lock: &map->async_lock); |
3250 | |
3251 | if (wake) |
3252 | wake_up(&map->async_waitq); |
3253 | } |
3254 | EXPORT_SYMBOL_GPL(regmap_async_complete_cb); |
3255 | |
3256 | static int regmap_async_is_done(struct regmap *map) |
3257 | { |
3258 | unsigned long flags; |
3259 | int ret; |
3260 | |
3261 | spin_lock_irqsave(&map->async_lock, flags); |
3262 | ret = list_empty(head: &map->async_list); |
3263 | spin_unlock_irqrestore(lock: &map->async_lock, flags); |
3264 | |
3265 | return ret; |
3266 | } |
3267 | |
3268 | /** |
3269 | * regmap_async_complete - Ensure all asynchronous I/O has completed. |
3270 | * |
3271 | * @map: Map to operate on. |
3272 | * |
3273 | * Blocks until any pending asynchronous I/O has completed. Returns |
3274 | * an error code for any failed I/O operations. |
3275 | */ |
3276 | int regmap_async_complete(struct regmap *map) |
3277 | { |
3278 | unsigned long flags; |
3279 | int ret; |
3280 | |
3281 | /* Nothing to do with no async support */ |
3282 | if (!map->bus || !map->bus->async_write) |
3283 | return 0; |
3284 | |
3285 | trace_regmap_async_complete_start(map); |
3286 | |
3287 | wait_event(map->async_waitq, regmap_async_is_done(map)); |
3288 | |
3289 | spin_lock_irqsave(&map->async_lock, flags); |
3290 | ret = map->async_ret; |
3291 | map->async_ret = 0; |
3292 | spin_unlock_irqrestore(lock: &map->async_lock, flags); |
3293 | |
3294 | trace_regmap_async_complete_done(map); |
3295 | |
3296 | return ret; |
3297 | } |
3298 | EXPORT_SYMBOL_GPL(regmap_async_complete); |
3299 | |
3300 | /** |
3301 | * regmap_register_patch - Register and apply register updates to be applied |
3302 | * on device initialistion |
3303 | * |
3304 | * @map: Register map to apply updates to. |
3305 | * @regs: Values to update. |
3306 | * @num_regs: Number of entries in regs. |
3307 | * |
3308 | * Register a set of register updates to be applied to the device |
3309 | * whenever the device registers are synchronised with the cache and |
3310 | * apply them immediately. Typically this is used to apply |
3311 | * corrections to be applied to the device defaults on startup, such |
3312 | * as the updates some vendors provide to undocumented registers. |
3313 | * |
3314 | * The caller must ensure that this function cannot be called |
3315 | * concurrently with either itself or regcache_sync(). |
3316 | */ |
3317 | int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs, |
3318 | int num_regs) |
3319 | { |
3320 | struct reg_sequence *p; |
3321 | int ret; |
3322 | bool bypass; |
3323 | |
3324 | if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n" , |
3325 | num_regs)) |
3326 | return 0; |
3327 | |
3328 | p = krealloc(objp: map->patch, |
3329 | new_size: sizeof(struct reg_sequence) * (map->patch_regs + num_regs), |
3330 | GFP_KERNEL); |
3331 | if (p) { |
3332 | memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs)); |
3333 | map->patch = p; |
3334 | map->patch_regs += num_regs; |
3335 | } else { |
3336 | return -ENOMEM; |
3337 | } |
3338 | |
3339 | map->lock(map->lock_arg); |
3340 | |
3341 | bypass = map->cache_bypass; |
3342 | |
3343 | map->cache_bypass = true; |
3344 | map->async = true; |
3345 | |
3346 | ret = _regmap_multi_reg_write(map, regs, num_regs); |
3347 | |
3348 | map->async = false; |
3349 | map->cache_bypass = bypass; |
3350 | |
3351 | map->unlock(map->lock_arg); |
3352 | |
3353 | regmap_async_complete(map); |
3354 | |
3355 | return ret; |
3356 | } |
3357 | EXPORT_SYMBOL_GPL(regmap_register_patch); |
3358 | |
3359 | /** |
3360 | * regmap_get_val_bytes() - Report the size of a register value |
3361 | * |
3362 | * @map: Register map to operate on. |
3363 | * |
3364 | * Report the size of a register value, mainly intended to for use by |
3365 | * generic infrastructure built on top of regmap. |
3366 | */ |
3367 | int regmap_get_val_bytes(struct regmap *map) |
3368 | { |
3369 | if (map->format.format_write) |
3370 | return -EINVAL; |
3371 | |
3372 | return map->format.val_bytes; |
3373 | } |
3374 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); |
3375 | |
3376 | /** |
3377 | * regmap_get_max_register() - Report the max register value |
3378 | * |
3379 | * @map: Register map to operate on. |
3380 | * |
3381 | * Report the max register value, mainly intended to for use by |
3382 | * generic infrastructure built on top of regmap. |
3383 | */ |
3384 | int regmap_get_max_register(struct regmap *map) |
3385 | { |
3386 | return map->max_register ? map->max_register : -EINVAL; |
3387 | } |
3388 | EXPORT_SYMBOL_GPL(regmap_get_max_register); |
3389 | |
3390 | /** |
3391 | * regmap_get_reg_stride() - Report the register address stride |
3392 | * |
3393 | * @map: Register map to operate on. |
3394 | * |
3395 | * Report the register address stride, mainly intended to for use by |
3396 | * generic infrastructure built on top of regmap. |
3397 | */ |
3398 | int regmap_get_reg_stride(struct regmap *map) |
3399 | { |
3400 | return map->reg_stride; |
3401 | } |
3402 | EXPORT_SYMBOL_GPL(regmap_get_reg_stride); |
3403 | |
3404 | /** |
3405 | * regmap_might_sleep() - Returns whether a regmap access might sleep. |
3406 | * |
3407 | * @map: Register map to operate on. |
3408 | * |
3409 | * Returns true if an access to the register might sleep, else false. |
3410 | */ |
3411 | bool regmap_might_sleep(struct regmap *map) |
3412 | { |
3413 | return map->can_sleep; |
3414 | } |
3415 | EXPORT_SYMBOL_GPL(regmap_might_sleep); |
3416 | |
3417 | int regmap_parse_val(struct regmap *map, const void *buf, |
3418 | unsigned int *val) |
3419 | { |
3420 | if (!map->format.parse_val) |
3421 | return -EINVAL; |
3422 | |
3423 | *val = map->format.parse_val(buf); |
3424 | |
3425 | return 0; |
3426 | } |
3427 | EXPORT_SYMBOL_GPL(regmap_parse_val); |
3428 | |
3429 | static int __init regmap_initcall(void) |
3430 | { |
3431 | regmap_debugfs_initcall(); |
3432 | |
3433 | return 0; |
3434 | } |
3435 | postcore_initcall(regmap_initcall); |
3436 | |