2 * Register map access API
4 * Copyright 2011 Wolfson Microelectronics plc
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/device.h>
14 #include <linux/slab.h>
15 #include <linux/export.h>
16 #include <linux/mutex.h>
17 #include <linux/err.h>
19 #include <linux/rbtree.h>
20 #include <linux/sched.h>
21 #include <linux/delay.h>
22 #include <linux/log2.h>
24 #define CREATE_TRACE_POINTS
30 * Sometimes for failures during very early init the trace
31 * infrastructure isn't available early enough to be used. For this
32 * sort of problem defining LOG_DEVICE will add printks for basic
33 * register I/O on a specific device.
37 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
38 unsigned int mask
, unsigned int val
,
39 bool *change
, bool force_write
);
41 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
43 static int _regmap_bus_read(void *context
, unsigned int reg
,
45 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
47 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
49 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
52 bool regmap_reg_in_ranges(unsigned int reg
,
53 const struct regmap_range
*ranges
,
56 const struct regmap_range
*r
;
59 for (i
= 0, r
= ranges
; i
< nranges
; i
++, r
++)
60 if (regmap_reg_in_range(reg
, r
))
64 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges
);
66 bool regmap_check_range_table(struct regmap
*map
, unsigned int reg
,
67 const struct regmap_access_table
*table
)
69 /* Check "no ranges" first */
70 if (regmap_reg_in_ranges(reg
, table
->no_ranges
, table
->n_no_ranges
))
73 /* In case zero "yes ranges" are supplied, any reg is OK */
74 if (!table
->n_yes_ranges
)
77 return regmap_reg_in_ranges(reg
, table
->yes_ranges
,
80 EXPORT_SYMBOL_GPL(regmap_check_range_table
);
82 bool regmap_writeable(struct regmap
*map
, unsigned int reg
)
84 if (map
->max_register
&& reg
> map
->max_register
)
87 if (map
->writeable_reg
)
88 return map
->writeable_reg(map
->dev
, reg
);
91 return regmap_check_range_table(map
, reg
, map
->wr_table
);
96 bool regmap_cached(struct regmap
*map
, unsigned int reg
)
101 if (map
->cache
== REGCACHE_NONE
)
107 if (map
->max_register
&& reg
> map
->max_register
)
110 map
->lock(map
->lock_arg
);
111 ret
= regcache_read(map
, reg
, &val
);
112 map
->unlock(map
->lock_arg
);
119 bool regmap_readable(struct regmap
*map
, unsigned int reg
)
124 if (map
->max_register
&& reg
> map
->max_register
)
127 if (map
->format
.format_write
)
130 if (map
->readable_reg
)
131 return map
->readable_reg(map
->dev
, reg
);
134 return regmap_check_range_table(map
, reg
, map
->rd_table
);
139 bool regmap_volatile(struct regmap
*map
, unsigned int reg
)
141 if (!map
->format
.format_write
&& !regmap_readable(map
, reg
))
144 if (map
->volatile_reg
)
145 return map
->volatile_reg(map
->dev
, reg
);
147 if (map
->volatile_table
)
148 return regmap_check_range_table(map
, reg
, map
->volatile_table
);
156 bool regmap_precious(struct regmap
*map
, unsigned int reg
)
158 if (!regmap_readable(map
, reg
))
161 if (map
->precious_reg
)
162 return map
->precious_reg(map
->dev
, reg
);
164 if (map
->precious_table
)
165 return regmap_check_range_table(map
, reg
, map
->precious_table
);
170 static bool regmap_volatile_range(struct regmap
*map
, unsigned int reg
,
175 for (i
= 0; i
< num
; i
++)
176 if (!regmap_volatile(map
, reg
+ i
))
182 static void regmap_format_2_6_write(struct regmap
*map
,
183 unsigned int reg
, unsigned int val
)
185 u8
*out
= map
->work_buf
;
187 *out
= (reg
<< 6) | val
;
190 static void regmap_format_4_12_write(struct regmap
*map
,
191 unsigned int reg
, unsigned int val
)
193 __be16
*out
= map
->work_buf
;
194 *out
= cpu_to_be16((reg
<< 12) | val
);
197 static void regmap_format_7_9_write(struct regmap
*map
,
198 unsigned int reg
, unsigned int val
)
200 __be16
*out
= map
->work_buf
;
201 *out
= cpu_to_be16((reg
<< 9) | val
);
204 static void regmap_format_10_14_write(struct regmap
*map
,
205 unsigned int reg
, unsigned int val
)
207 u8
*out
= map
->work_buf
;
210 out
[1] = (val
>> 8) | (reg
<< 6);
214 static void regmap_format_8(void *buf
, unsigned int val
, unsigned int shift
)
221 static void regmap_format_16_be(void *buf
, unsigned int val
, unsigned int shift
)
225 b
[0] = cpu_to_be16(val
<< shift
);
228 static void regmap_format_16_le(void *buf
, unsigned int val
, unsigned int shift
)
232 b
[0] = cpu_to_le16(val
<< shift
);
235 static void regmap_format_16_native(void *buf
, unsigned int val
,
238 *(u16
*)buf
= val
<< shift
;
241 static void regmap_format_24(void *buf
, unsigned int val
, unsigned int shift
)
252 static void regmap_format_32_be(void *buf
, unsigned int val
, unsigned int shift
)
256 b
[0] = cpu_to_be32(val
<< shift
);
259 static void regmap_format_32_le(void *buf
, unsigned int val
, unsigned int shift
)
263 b
[0] = cpu_to_le32(val
<< shift
);
266 static void regmap_format_32_native(void *buf
, unsigned int val
,
269 *(u32
*)buf
= val
<< shift
;
273 static void regmap_format_64_be(void *buf
, unsigned int val
, unsigned int shift
)
277 b
[0] = cpu_to_be64((u64
)val
<< shift
);
280 static void regmap_format_64_le(void *buf
, unsigned int val
, unsigned int shift
)
284 b
[0] = cpu_to_le64((u64
)val
<< shift
);
287 static void regmap_format_64_native(void *buf
, unsigned int val
,
290 *(u64
*)buf
= (u64
)val
<< shift
;
294 static void regmap_parse_inplace_noop(void *buf
)
298 static unsigned int regmap_parse_8(const void *buf
)
305 static unsigned int regmap_parse_16_be(const void *buf
)
307 const __be16
*b
= buf
;
309 return be16_to_cpu(b
[0]);
312 static unsigned int regmap_parse_16_le(const void *buf
)
314 const __le16
*b
= buf
;
316 return le16_to_cpu(b
[0]);
319 static void regmap_parse_16_be_inplace(void *buf
)
323 b
[0] = be16_to_cpu(b
[0]);
326 static void regmap_parse_16_le_inplace(void *buf
)
330 b
[0] = le16_to_cpu(b
[0]);
333 static unsigned int regmap_parse_16_native(const void *buf
)
338 static unsigned int regmap_parse_24(const void *buf
)
341 unsigned int ret
= b
[2];
342 ret
|= ((unsigned int)b
[1]) << 8;
343 ret
|= ((unsigned int)b
[0]) << 16;
348 static unsigned int regmap_parse_32_be(const void *buf
)
350 const __be32
*b
= buf
;
352 return be32_to_cpu(b
[0]);
355 static unsigned int regmap_parse_32_le(const void *buf
)
357 const __le32
*b
= buf
;
359 return le32_to_cpu(b
[0]);
362 static void regmap_parse_32_be_inplace(void *buf
)
366 b
[0] = be32_to_cpu(b
[0]);
369 static void regmap_parse_32_le_inplace(void *buf
)
373 b
[0] = le32_to_cpu(b
[0]);
376 static unsigned int regmap_parse_32_native(const void *buf
)
382 static unsigned int regmap_parse_64_be(const void *buf
)
384 const __be64
*b
= buf
;
386 return be64_to_cpu(b
[0]);
389 static unsigned int regmap_parse_64_le(const void *buf
)
391 const __le64
*b
= buf
;
393 return le64_to_cpu(b
[0]);
396 static void regmap_parse_64_be_inplace(void *buf
)
400 b
[0] = be64_to_cpu(b
[0]);
403 static void regmap_parse_64_le_inplace(void *buf
)
407 b
[0] = le64_to_cpu(b
[0]);
410 static unsigned int regmap_parse_64_native(const void *buf
)
416 static void regmap_lock_mutex(void *__map
)
418 struct regmap
*map
= __map
;
419 mutex_lock(&map
->mutex
);
422 static void regmap_unlock_mutex(void *__map
)
424 struct regmap
*map
= __map
;
425 mutex_unlock(&map
->mutex
);
428 static void regmap_lock_spinlock(void *__map
)
429 __acquires(&map
->spinlock
)
431 struct regmap
*map
= __map
;
434 spin_lock_irqsave(&map
->spinlock
, flags
);
435 map
->spinlock_flags
= flags
;
438 static void regmap_unlock_spinlock(void *__map
)
439 __releases(&map
->spinlock
)
441 struct regmap
*map
= __map
;
442 spin_unlock_irqrestore(&map
->spinlock
, map
->spinlock_flags
);
445 static void dev_get_regmap_release(struct device
*dev
, void *res
)
448 * We don't actually have anything to do here; the goal here
449 * is not to manage the regmap but to provide a simple way to
450 * get the regmap back given a struct device.
454 static bool _regmap_range_add(struct regmap
*map
,
455 struct regmap_range_node
*data
)
457 struct rb_root
*root
= &map
->range_tree
;
458 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
461 struct regmap_range_node
*this =
462 container_of(*new, struct regmap_range_node
, node
);
465 if (data
->range_max
< this->range_min
)
466 new = &((*new)->rb_left
);
467 else if (data
->range_min
> this->range_max
)
468 new = &((*new)->rb_right
);
473 rb_link_node(&data
->node
, parent
, new);
474 rb_insert_color(&data
->node
, root
);
479 static struct regmap_range_node
*_regmap_range_lookup(struct regmap
*map
,
482 struct rb_node
*node
= map
->range_tree
.rb_node
;
485 struct regmap_range_node
*this =
486 container_of(node
, struct regmap_range_node
, node
);
488 if (reg
< this->range_min
)
489 node
= node
->rb_left
;
490 else if (reg
> this->range_max
)
491 node
= node
->rb_right
;
499 static void regmap_range_exit(struct regmap
*map
)
501 struct rb_node
*next
;
502 struct regmap_range_node
*range_node
;
504 next
= rb_first(&map
->range_tree
);
506 range_node
= rb_entry(next
, struct regmap_range_node
, node
);
507 next
= rb_next(&range_node
->node
);
508 rb_erase(&range_node
->node
, &map
->range_tree
);
512 kfree(map
->selector_work_buf
);
515 int regmap_attach_dev(struct device
*dev
, struct regmap
*map
,
516 const struct regmap_config
*config
)
522 regmap_debugfs_init(map
, config
->name
);
524 /* Add a devres resource for dev_get_regmap() */
525 m
= devres_alloc(dev_get_regmap_release
, sizeof(*m
), GFP_KERNEL
);
527 regmap_debugfs_exit(map
);
535 EXPORT_SYMBOL_GPL(regmap_attach_dev
);
537 static enum regmap_endian
regmap_get_reg_endian(const struct regmap_bus
*bus
,
538 const struct regmap_config
*config
)
540 enum regmap_endian endian
;
542 /* Retrieve the endianness specification from the regmap config */
543 endian
= config
->reg_format_endian
;
545 /* If the regmap config specified a non-default value, use that */
546 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
549 /* Retrieve the endianness specification from the bus config */
550 if (bus
&& bus
->reg_format_endian_default
)
551 endian
= bus
->reg_format_endian_default
;
553 /* If the bus specified a non-default value, use that */
554 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
557 /* Use this if no other value was found */
558 return REGMAP_ENDIAN_BIG
;
561 enum regmap_endian
regmap_get_val_endian(struct device
*dev
,
562 const struct regmap_bus
*bus
,
563 const struct regmap_config
*config
)
565 struct device_node
*np
;
566 enum regmap_endian endian
;
568 /* Retrieve the endianness specification from the regmap config */
569 endian
= config
->val_format_endian
;
571 /* If the regmap config specified a non-default value, use that */
572 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
575 /* If the dev and dev->of_node exist try to get endianness from DT */
576 if (dev
&& dev
->of_node
) {
579 /* Parse the device's DT node for an endianness specification */
580 if (of_property_read_bool(np
, "big-endian"))
581 endian
= REGMAP_ENDIAN_BIG
;
582 else if (of_property_read_bool(np
, "little-endian"))
583 endian
= REGMAP_ENDIAN_LITTLE
;
584 else if (of_property_read_bool(np
, "native-endian"))
585 endian
= REGMAP_ENDIAN_NATIVE
;
587 /* If the endianness was specified in DT, use that */
588 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
592 /* Retrieve the endianness specification from the bus config */
593 if (bus
&& bus
->val_format_endian_default
)
594 endian
= bus
->val_format_endian_default
;
596 /* If the bus specified a non-default value, use that */
597 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
600 /* Use this if no other value was found */
601 return REGMAP_ENDIAN_BIG
;
603 EXPORT_SYMBOL_GPL(regmap_get_val_endian
);
605 struct regmap
*__regmap_init(struct device
*dev
,
606 const struct regmap_bus
*bus
,
608 const struct regmap_config
*config
,
609 struct lock_class_key
*lock_key
,
610 const char *lock_name
)
614 enum regmap_endian reg_endian
, val_endian
;
620 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
626 if (config
->lock
&& config
->unlock
) {
627 map
->lock
= config
->lock
;
628 map
->unlock
= config
->unlock
;
629 map
->lock_arg
= config
->lock_arg
;
631 if ((bus
&& bus
->fast_io
) ||
633 spin_lock_init(&map
->spinlock
);
634 map
->lock
= regmap_lock_spinlock
;
635 map
->unlock
= regmap_unlock_spinlock
;
636 lockdep_set_class_and_name(&map
->spinlock
,
637 lock_key
, lock_name
);
639 mutex_init(&map
->mutex
);
640 map
->lock
= regmap_lock_mutex
;
641 map
->unlock
= regmap_unlock_mutex
;
642 lockdep_set_class_and_name(&map
->mutex
,
643 lock_key
, lock_name
);
649 * When we write in fast-paths with regmap_bulk_write() don't allocate
650 * scratch buffers with sleeping allocations.
652 if ((bus
&& bus
->fast_io
) || config
->fast_io
)
653 map
->alloc_flags
= GFP_ATOMIC
;
655 map
->alloc_flags
= GFP_KERNEL
;
657 map
->format
.reg_bytes
= DIV_ROUND_UP(config
->reg_bits
, 8);
658 map
->format
.pad_bytes
= config
->pad_bits
/ 8;
659 map
->format
.val_bytes
= DIV_ROUND_UP(config
->val_bits
, 8);
660 map
->format
.buf_size
= DIV_ROUND_UP(config
->reg_bits
+
661 config
->val_bits
+ config
->pad_bits
, 8);
662 map
->reg_shift
= config
->pad_bits
% 8;
663 if (config
->reg_stride
)
664 map
->reg_stride
= config
->reg_stride
;
667 if (is_power_of_2(map
->reg_stride
))
668 map
->reg_stride_order
= ilog2(map
->reg_stride
);
670 map
->reg_stride_order
= -1;
671 map
->use_single_read
= config
->use_single_rw
|| !bus
|| !bus
->read
;
672 map
->use_single_write
= config
->use_single_rw
|| !bus
|| !bus
->write
;
673 map
->can_multi_write
= config
->can_multi_write
&& bus
&& bus
->write
;
675 map
->max_raw_read
= bus
->max_raw_read
;
676 map
->max_raw_write
= bus
->max_raw_write
;
680 map
->bus_context
= bus_context
;
681 map
->max_register
= config
->max_register
;
682 map
->wr_table
= config
->wr_table
;
683 map
->rd_table
= config
->rd_table
;
684 map
->volatile_table
= config
->volatile_table
;
685 map
->precious_table
= config
->precious_table
;
686 map
->writeable_reg
= config
->writeable_reg
;
687 map
->readable_reg
= config
->readable_reg
;
688 map
->volatile_reg
= config
->volatile_reg
;
689 map
->precious_reg
= config
->precious_reg
;
690 map
->cache_type
= config
->cache_type
;
691 map
->name
= config
->name
;
693 spin_lock_init(&map
->async_lock
);
694 INIT_LIST_HEAD(&map
->async_list
);
695 INIT_LIST_HEAD(&map
->async_free
);
696 init_waitqueue_head(&map
->async_waitq
);
698 if (config
->read_flag_mask
|| config
->write_flag_mask
) {
699 map
->read_flag_mask
= config
->read_flag_mask
;
700 map
->write_flag_mask
= config
->write_flag_mask
;
702 map
->read_flag_mask
= bus
->read_flag_mask
;
706 map
->reg_read
= config
->reg_read
;
707 map
->reg_write
= config
->reg_write
;
709 map
->defer_caching
= false;
710 goto skip_format_initialization
;
711 } else if (!bus
->read
|| !bus
->write
) {
712 map
->reg_read
= _regmap_bus_reg_read
;
713 map
->reg_write
= _regmap_bus_reg_write
;
715 map
->defer_caching
= false;
716 goto skip_format_initialization
;
718 map
->reg_read
= _regmap_bus_read
;
719 map
->reg_update_bits
= bus
->reg_update_bits
;
722 reg_endian
= regmap_get_reg_endian(bus
, config
);
723 val_endian
= regmap_get_val_endian(dev
, bus
, config
);
725 switch (config
->reg_bits
+ map
->reg_shift
) {
727 switch (config
->val_bits
) {
729 map
->format
.format_write
= regmap_format_2_6_write
;
737 switch (config
->val_bits
) {
739 map
->format
.format_write
= regmap_format_4_12_write
;
747 switch (config
->val_bits
) {
749 map
->format
.format_write
= regmap_format_7_9_write
;
757 switch (config
->val_bits
) {
759 map
->format
.format_write
= regmap_format_10_14_write
;
767 map
->format
.format_reg
= regmap_format_8
;
771 switch (reg_endian
) {
772 case REGMAP_ENDIAN_BIG
:
773 map
->format
.format_reg
= regmap_format_16_be
;
775 case REGMAP_ENDIAN_NATIVE
:
776 map
->format
.format_reg
= regmap_format_16_native
;
784 if (reg_endian
!= REGMAP_ENDIAN_BIG
)
786 map
->format
.format_reg
= regmap_format_24
;
790 switch (reg_endian
) {
791 case REGMAP_ENDIAN_BIG
:
792 map
->format
.format_reg
= regmap_format_32_be
;
794 case REGMAP_ENDIAN_NATIVE
:
795 map
->format
.format_reg
= regmap_format_32_native
;
804 switch (reg_endian
) {
805 case REGMAP_ENDIAN_BIG
:
806 map
->format
.format_reg
= regmap_format_64_be
;
808 case REGMAP_ENDIAN_NATIVE
:
809 map
->format
.format_reg
= regmap_format_64_native
;
821 if (val_endian
== REGMAP_ENDIAN_NATIVE
)
822 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
824 switch (config
->val_bits
) {
826 map
->format
.format_val
= regmap_format_8
;
827 map
->format
.parse_val
= regmap_parse_8
;
828 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
831 switch (val_endian
) {
832 case REGMAP_ENDIAN_BIG
:
833 map
->format
.format_val
= regmap_format_16_be
;
834 map
->format
.parse_val
= regmap_parse_16_be
;
835 map
->format
.parse_inplace
= regmap_parse_16_be_inplace
;
837 case REGMAP_ENDIAN_LITTLE
:
838 map
->format
.format_val
= regmap_format_16_le
;
839 map
->format
.parse_val
= regmap_parse_16_le
;
840 map
->format
.parse_inplace
= regmap_parse_16_le_inplace
;
842 case REGMAP_ENDIAN_NATIVE
:
843 map
->format
.format_val
= regmap_format_16_native
;
844 map
->format
.parse_val
= regmap_parse_16_native
;
851 if (val_endian
!= REGMAP_ENDIAN_BIG
)
853 map
->format
.format_val
= regmap_format_24
;
854 map
->format
.parse_val
= regmap_parse_24
;
857 switch (val_endian
) {
858 case REGMAP_ENDIAN_BIG
:
859 map
->format
.format_val
= regmap_format_32_be
;
860 map
->format
.parse_val
= regmap_parse_32_be
;
861 map
->format
.parse_inplace
= regmap_parse_32_be_inplace
;
863 case REGMAP_ENDIAN_LITTLE
:
864 map
->format
.format_val
= regmap_format_32_le
;
865 map
->format
.parse_val
= regmap_parse_32_le
;
866 map
->format
.parse_inplace
= regmap_parse_32_le_inplace
;
868 case REGMAP_ENDIAN_NATIVE
:
869 map
->format
.format_val
= regmap_format_32_native
;
870 map
->format
.parse_val
= regmap_parse_32_native
;
878 switch (val_endian
) {
879 case REGMAP_ENDIAN_BIG
:
880 map
->format
.format_val
= regmap_format_64_be
;
881 map
->format
.parse_val
= regmap_parse_64_be
;
882 map
->format
.parse_inplace
= regmap_parse_64_be_inplace
;
884 case REGMAP_ENDIAN_LITTLE
:
885 map
->format
.format_val
= regmap_format_64_le
;
886 map
->format
.parse_val
= regmap_parse_64_le
;
887 map
->format
.parse_inplace
= regmap_parse_64_le_inplace
;
889 case REGMAP_ENDIAN_NATIVE
:
890 map
->format
.format_val
= regmap_format_64_native
;
891 map
->format
.parse_val
= regmap_parse_64_native
;
900 if (map
->format
.format_write
) {
901 if ((reg_endian
!= REGMAP_ENDIAN_BIG
) ||
902 (val_endian
!= REGMAP_ENDIAN_BIG
))
904 map
->use_single_write
= true;
907 if (!map
->format
.format_write
&&
908 !(map
->format
.format_reg
&& map
->format
.format_val
))
911 map
->work_buf
= kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
912 if (map
->work_buf
== NULL
) {
917 if (map
->format
.format_write
) {
918 map
->defer_caching
= false;
919 map
->reg_write
= _regmap_bus_formatted_write
;
920 } else if (map
->format
.format_val
) {
921 map
->defer_caching
= true;
922 map
->reg_write
= _regmap_bus_raw_write
;
925 skip_format_initialization
:
927 map
->range_tree
= RB_ROOT
;
928 for (i
= 0; i
< config
->num_ranges
; i
++) {
929 const struct regmap_range_cfg
*range_cfg
= &config
->ranges
[i
];
930 struct regmap_range_node
*new;
933 if (range_cfg
->range_max
< range_cfg
->range_min
) {
934 dev_err(map
->dev
, "Invalid range %d: %d < %d\n", i
,
935 range_cfg
->range_max
, range_cfg
->range_min
);
939 if (range_cfg
->range_max
> map
->max_register
) {
940 dev_err(map
->dev
, "Invalid range %d: %d > %d\n", i
,
941 range_cfg
->range_max
, map
->max_register
);
945 if (range_cfg
->selector_reg
> map
->max_register
) {
947 "Invalid range %d: selector out of map\n", i
);
951 if (range_cfg
->window_len
== 0) {
952 dev_err(map
->dev
, "Invalid range %d: window_len 0\n",
957 /* Make sure, that this register range has no selector
958 or data window within its boundary */
959 for (j
= 0; j
< config
->num_ranges
; j
++) {
960 unsigned sel_reg
= config
->ranges
[j
].selector_reg
;
961 unsigned win_min
= config
->ranges
[j
].window_start
;
962 unsigned win_max
= win_min
+
963 config
->ranges
[j
].window_len
- 1;
965 /* Allow data window inside its own virtual range */
969 if (range_cfg
->range_min
<= sel_reg
&&
970 sel_reg
<= range_cfg
->range_max
) {
972 "Range %d: selector for %d in window\n",
977 if (!(win_max
< range_cfg
->range_min
||
978 win_min
> range_cfg
->range_max
)) {
980 "Range %d: window for %d in window\n",
986 new = kzalloc(sizeof(*new), GFP_KERNEL
);
993 new->name
= range_cfg
->name
;
994 new->range_min
= range_cfg
->range_min
;
995 new->range_max
= range_cfg
->range_max
;
996 new->selector_reg
= range_cfg
->selector_reg
;
997 new->selector_mask
= range_cfg
->selector_mask
;
998 new->selector_shift
= range_cfg
->selector_shift
;
999 new->window_start
= range_cfg
->window_start
;
1000 new->window_len
= range_cfg
->window_len
;
1002 if (!_regmap_range_add(map
, new)) {
1003 dev_err(map
->dev
, "Failed to add range %d\n", i
);
1008 if (map
->selector_work_buf
== NULL
) {
1009 map
->selector_work_buf
=
1010 kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
1011 if (map
->selector_work_buf
== NULL
) {
1018 ret
= regcache_init(map
, config
);
1023 ret
= regmap_attach_dev(dev
, map
, config
);
1033 regmap_range_exit(map
);
1034 kfree(map
->work_buf
);
1038 return ERR_PTR(ret
);
1040 EXPORT_SYMBOL_GPL(__regmap_init
);
1042 static void devm_regmap_release(struct device
*dev
, void *res
)
1044 regmap_exit(*(struct regmap
**)res
);
1047 struct regmap
*__devm_regmap_init(struct device
*dev
,
1048 const struct regmap_bus
*bus
,
1050 const struct regmap_config
*config
,
1051 struct lock_class_key
*lock_key
,
1052 const char *lock_name
)
1054 struct regmap
**ptr
, *regmap
;
1056 ptr
= devres_alloc(devm_regmap_release
, sizeof(*ptr
), GFP_KERNEL
);
1058 return ERR_PTR(-ENOMEM
);
1060 regmap
= __regmap_init(dev
, bus
, bus_context
, config
,
1061 lock_key
, lock_name
);
1062 if (!IS_ERR(regmap
)) {
1064 devres_add(dev
, ptr
);
1071 EXPORT_SYMBOL_GPL(__devm_regmap_init
);
1073 static void regmap_field_init(struct regmap_field
*rm_field
,
1074 struct regmap
*regmap
, struct reg_field reg_field
)
1076 rm_field
->regmap
= regmap
;
1077 rm_field
->reg
= reg_field
.reg
;
1078 rm_field
->shift
= reg_field
.lsb
;
1079 rm_field
->mask
= GENMASK(reg_field
.msb
, reg_field
.lsb
);
1080 rm_field
->id_size
= reg_field
.id_size
;
1081 rm_field
->id_offset
= reg_field
.id_offset
;
1085 * devm_regmap_field_alloc(): Allocate and initialise a register field
1086 * in a register map.
1088 * @dev: Device that will be interacted with
1089 * @regmap: regmap bank in which this register field is located.
1090 * @reg_field: Register field with in the bank.
1092 * The return value will be an ERR_PTR() on error or a valid pointer
1093 * to a struct regmap_field. The regmap_field will be automatically freed
1094 * by the device management code.
1096 struct regmap_field
*devm_regmap_field_alloc(struct device
*dev
,
1097 struct regmap
*regmap
, struct reg_field reg_field
)
1099 struct regmap_field
*rm_field
= devm_kzalloc(dev
,
1100 sizeof(*rm_field
), GFP_KERNEL
);
1102 return ERR_PTR(-ENOMEM
);
1104 regmap_field_init(rm_field
, regmap
, reg_field
);
1109 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc
);
1112 * devm_regmap_field_free(): Free register field allocated using
1113 * devm_regmap_field_alloc. Usally drivers need not call this function,
1114 * as the memory allocated via devm will be freed as per device-driver
1117 * @dev: Device that will be interacted with
1118 * @field: regmap field which should be freed.
1120 void devm_regmap_field_free(struct device
*dev
,
1121 struct regmap_field
*field
)
1123 devm_kfree(dev
, field
);
1125 EXPORT_SYMBOL_GPL(devm_regmap_field_free
);
1128 * regmap_field_alloc(): Allocate and initialise a register field
1129 * in a register map.
1131 * @regmap: regmap bank in which this register field is located.
1132 * @reg_field: Register field with in the bank.
1134 * The return value will be an ERR_PTR() on error or a valid pointer
1135 * to a struct regmap_field. The regmap_field should be freed by the
1136 * user once its finished working with it using regmap_field_free().
1138 struct regmap_field
*regmap_field_alloc(struct regmap
*regmap
,
1139 struct reg_field reg_field
)
1141 struct regmap_field
*rm_field
= kzalloc(sizeof(*rm_field
), GFP_KERNEL
);
1144 return ERR_PTR(-ENOMEM
);
1146 regmap_field_init(rm_field
, regmap
, reg_field
);
1150 EXPORT_SYMBOL_GPL(regmap_field_alloc
);
1153 * regmap_field_free(): Free register field allocated using regmap_field_alloc
1155 * @field: regmap field which should be freed.
1157 void regmap_field_free(struct regmap_field
*field
)
1161 EXPORT_SYMBOL_GPL(regmap_field_free
);
1164 * regmap_reinit_cache(): Reinitialise the current register cache
1166 * @map: Register map to operate on.
1167 * @config: New configuration. Only the cache data will be used.
1169 * Discard any existing register cache for the map and initialize a
1170 * new cache. This can be used to restore the cache to defaults or to
1171 * update the cache configuration to reflect runtime discovery of the
1174 * No explicit locking is done here, the user needs to ensure that
1175 * this function will not race with other calls to regmap.
1177 int regmap_reinit_cache(struct regmap
*map
, const struct regmap_config
*config
)
1180 regmap_debugfs_exit(map
);
1182 map
->max_register
= config
->max_register
;
1183 map
->writeable_reg
= config
->writeable_reg
;
1184 map
->readable_reg
= config
->readable_reg
;
1185 map
->volatile_reg
= config
->volatile_reg
;
1186 map
->precious_reg
= config
->precious_reg
;
1187 map
->cache_type
= config
->cache_type
;
1189 regmap_debugfs_init(map
, config
->name
);
1191 map
->cache_bypass
= false;
1192 map
->cache_only
= false;
1194 return regcache_init(map
, config
);
1196 EXPORT_SYMBOL_GPL(regmap_reinit_cache
);
1199 * regmap_exit(): Free a previously allocated register map
1201 void regmap_exit(struct regmap
*map
)
1203 struct regmap_async
*async
;
1206 regmap_debugfs_exit(map
);
1207 regmap_range_exit(map
);
1208 if (map
->bus
&& map
->bus
->free_context
)
1209 map
->bus
->free_context(map
->bus_context
);
1210 kfree(map
->work_buf
);
1211 while (!list_empty(&map
->async_free
)) {
1212 async
= list_first_entry_or_null(&map
->async_free
,
1213 struct regmap_async
,
1215 list_del(&async
->list
);
1216 kfree(async
->work_buf
);
1221 EXPORT_SYMBOL_GPL(regmap_exit
);
1223 static int dev_get_regmap_match(struct device
*dev
, void *res
, void *data
)
1225 struct regmap
**r
= res
;
1231 /* If the user didn't specify a name match any */
1233 return (*r
)->name
== data
;
1239 * dev_get_regmap(): Obtain the regmap (if any) for a device
1241 * @dev: Device to retrieve the map for
1242 * @name: Optional name for the register map, usually NULL.
1244 * Returns the regmap for the device if one is present, or NULL. If
1245 * name is specified then it must match the name specified when
1246 * registering the device, if it is NULL then the first regmap found
1247 * will be used. Devices with multiple register maps are very rare,
1248 * generic code should normally not need to specify a name.
1250 struct regmap
*dev_get_regmap(struct device
*dev
, const char *name
)
1252 struct regmap
**r
= devres_find(dev
, dev_get_regmap_release
,
1253 dev_get_regmap_match
, (void *)name
);
1259 EXPORT_SYMBOL_GPL(dev_get_regmap
);
1262 * regmap_get_device(): Obtain the device from a regmap
1264 * @map: Register map to operate on.
1266 * Returns the underlying device that the regmap has been created for.
1268 struct device
*regmap_get_device(struct regmap
*map
)
1272 EXPORT_SYMBOL_GPL(regmap_get_device
);
1274 static int _regmap_select_page(struct regmap
*map
, unsigned int *reg
,
1275 struct regmap_range_node
*range
,
1276 unsigned int val_num
)
1278 void *orig_work_buf
;
1279 unsigned int win_offset
;
1280 unsigned int win_page
;
1284 win_offset
= (*reg
- range
->range_min
) % range
->window_len
;
1285 win_page
= (*reg
- range
->range_min
) / range
->window_len
;
1288 /* Bulk write shouldn't cross range boundary */
1289 if (*reg
+ val_num
- 1 > range
->range_max
)
1292 /* ... or single page boundary */
1293 if (val_num
> range
->window_len
- win_offset
)
1297 /* It is possible to have selector register inside data window.
1298 In that case, selector register is located on every page and
1299 it needs no page switching, when accessed alone. */
1301 range
->window_start
+ win_offset
!= range
->selector_reg
) {
1302 /* Use separate work_buf during page switching */
1303 orig_work_buf
= map
->work_buf
;
1304 map
->work_buf
= map
->selector_work_buf
;
1306 ret
= _regmap_update_bits(map
, range
->selector_reg
,
1307 range
->selector_mask
,
1308 win_page
<< range
->selector_shift
,
1311 map
->work_buf
= orig_work_buf
;
1317 *reg
= range
->window_start
+ win_offset
;
1322 int _regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1323 const void *val
, size_t val_len
)
1325 struct regmap_range_node
*range
;
1326 unsigned long flags
;
1327 u8
*u8
= map
->work_buf
;
1328 void *work_val
= map
->work_buf
+ map
->format
.reg_bytes
+
1329 map
->format
.pad_bytes
;
1331 int ret
= -ENOTSUPP
;
1337 /* Check for unwritable registers before we start */
1338 if (map
->writeable_reg
)
1339 for (i
= 0; i
< val_len
/ map
->format
.val_bytes
; i
++)
1340 if (!map
->writeable_reg(map
->dev
,
1341 reg
+ regmap_get_offset(map
, i
)))
1344 if (!map
->cache_bypass
&& map
->format
.parse_val
) {
1346 int val_bytes
= map
->format
.val_bytes
;
1347 for (i
= 0; i
< val_len
/ val_bytes
; i
++) {
1348 ival
= map
->format
.parse_val(val
+ (i
* val_bytes
));
1349 ret
= regcache_write(map
,
1350 reg
+ regmap_get_offset(map
, i
),
1354 "Error in caching of register: %x ret: %d\n",
1359 if (map
->cache_only
) {
1360 map
->cache_dirty
= true;
1365 range
= _regmap_range_lookup(map
, reg
);
1367 int val_num
= val_len
/ map
->format
.val_bytes
;
1368 int win_offset
= (reg
- range
->range_min
) % range
->window_len
;
1369 int win_residue
= range
->window_len
- win_offset
;
1371 /* If the write goes beyond the end of the window split it */
1372 while (val_num
> win_residue
) {
1373 dev_dbg(map
->dev
, "Writing window %d/%zu\n",
1374 win_residue
, val_len
/ map
->format
.val_bytes
);
1375 ret
= _regmap_raw_write(map
, reg
, val
, win_residue
*
1376 map
->format
.val_bytes
);
1381 val_num
-= win_residue
;
1382 val
+= win_residue
* map
->format
.val_bytes
;
1383 val_len
-= win_residue
* map
->format
.val_bytes
;
1385 win_offset
= (reg
- range
->range_min
) %
1387 win_residue
= range
->window_len
- win_offset
;
1390 ret
= _regmap_select_page(map
, ®
, range
, val_num
);
1395 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
1397 u8
[0] |= map
->write_flag_mask
;
1400 * Essentially all I/O mechanisms will be faster with a single
1401 * buffer to write. Since register syncs often generate raw
1402 * writes of single registers optimise that case.
1404 if (val
!= work_val
&& val_len
== map
->format
.val_bytes
) {
1405 memcpy(work_val
, val
, map
->format
.val_bytes
);
1409 if (map
->async
&& map
->bus
->async_write
) {
1410 struct regmap_async
*async
;
1412 trace_regmap_async_write_start(map
, reg
, val_len
);
1414 spin_lock_irqsave(&map
->async_lock
, flags
);
1415 async
= list_first_entry_or_null(&map
->async_free
,
1416 struct regmap_async
,
1419 list_del(&async
->list
);
1420 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1423 async
= map
->bus
->async_alloc();
1427 async
->work_buf
= kzalloc(map
->format
.buf_size
,
1428 GFP_KERNEL
| GFP_DMA
);
1429 if (!async
->work_buf
) {
1437 /* If the caller supplied the value we can use it safely. */
1438 memcpy(async
->work_buf
, map
->work_buf
, map
->format
.pad_bytes
+
1439 map
->format
.reg_bytes
+ map
->format
.val_bytes
);
1441 spin_lock_irqsave(&map
->async_lock
, flags
);
1442 list_add_tail(&async
->list
, &map
->async_list
);
1443 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1445 if (val
!= work_val
)
1446 ret
= map
->bus
->async_write(map
->bus_context
,
1448 map
->format
.reg_bytes
+
1449 map
->format
.pad_bytes
,
1450 val
, val_len
, async
);
1452 ret
= map
->bus
->async_write(map
->bus_context
,
1454 map
->format
.reg_bytes
+
1455 map
->format
.pad_bytes
+
1456 val_len
, NULL
, 0, async
);
1459 dev_err(map
->dev
, "Failed to schedule write: %d\n",
1462 spin_lock_irqsave(&map
->async_lock
, flags
);
1463 list_move(&async
->list
, &map
->async_free
);
1464 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1470 trace_regmap_hw_write_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
1472 /* If we're doing a single register write we can probably just
1473 * send the work_buf directly, otherwise try to do a gather
1476 if (val
== work_val
)
1477 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1478 map
->format
.reg_bytes
+
1479 map
->format
.pad_bytes
+
1481 else if (map
->bus
->gather_write
)
1482 ret
= map
->bus
->gather_write(map
->bus_context
, map
->work_buf
,
1483 map
->format
.reg_bytes
+
1484 map
->format
.pad_bytes
,
1487 /* If that didn't work fall back on linearising by hand. */
1488 if (ret
== -ENOTSUPP
) {
1489 len
= map
->format
.reg_bytes
+ map
->format
.pad_bytes
+ val_len
;
1490 buf
= kzalloc(len
, GFP_KERNEL
);
1494 memcpy(buf
, map
->work_buf
, map
->format
.reg_bytes
);
1495 memcpy(buf
+ map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
1497 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1500 } else if (ret
!= 0 && !map
->cache_bypass
&& map
->format
.parse_val
) {
1501 regcache_drop_region(map
, reg
, reg
+ 1);
1504 trace_regmap_hw_write_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
1510 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1512 * @map: Map to check.
1514 bool regmap_can_raw_write(struct regmap
*map
)
1516 return map
->bus
&& map
->bus
->write
&& map
->format
.format_val
&&
1517 map
->format
.format_reg
;
1519 EXPORT_SYMBOL_GPL(regmap_can_raw_write
);
1522 * regmap_get_raw_read_max - Get the maximum size we can read
1524 * @map: Map to check.
1526 size_t regmap_get_raw_read_max(struct regmap
*map
)
1528 return map
->max_raw_read
;
1530 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max
);
1533 * regmap_get_raw_write_max - Get the maximum size we can read
1535 * @map: Map to check.
1537 size_t regmap_get_raw_write_max(struct regmap
*map
)
1539 return map
->max_raw_write
;
1541 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max
);
1543 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
1547 struct regmap_range_node
*range
;
1548 struct regmap
*map
= context
;
1550 WARN_ON(!map
->bus
|| !map
->format
.format_write
);
1552 range
= _regmap_range_lookup(map
, reg
);
1554 ret
= _regmap_select_page(map
, ®
, range
, 1);
1559 map
->format
.format_write(map
, reg
, val
);
1561 trace_regmap_hw_write_start(map
, reg
, 1);
1563 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1564 map
->format
.buf_size
);
1566 trace_regmap_hw_write_done(map
, reg
, 1);
1571 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
1574 struct regmap
*map
= context
;
1576 return map
->bus
->reg_write(map
->bus_context
, reg
, val
);
1579 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
1582 struct regmap
*map
= context
;
1584 WARN_ON(!map
->bus
|| !map
->format
.format_val
);
1586 map
->format
.format_val(map
->work_buf
+ map
->format
.reg_bytes
1587 + map
->format
.pad_bytes
, val
, 0);
1588 return _regmap_raw_write(map
, reg
,
1590 map
->format
.reg_bytes
+
1591 map
->format
.pad_bytes
,
1592 map
->format
.val_bytes
);
1595 static inline void *_regmap_map_get_context(struct regmap
*map
)
1597 return (map
->bus
) ? map
: map
->bus_context
;
1600 int _regmap_write(struct regmap
*map
, unsigned int reg
,
1604 void *context
= _regmap_map_get_context(map
);
1606 if (!regmap_writeable(map
, reg
))
1609 if (!map
->cache_bypass
&& !map
->defer_caching
) {
1610 ret
= regcache_write(map
, reg
, val
);
1613 if (map
->cache_only
) {
1614 map
->cache_dirty
= true;
1620 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
1621 dev_info(map
->dev
, "%x <= %x\n", reg
, val
);
1624 trace_regmap_reg_write(map
, reg
, val
);
1626 return map
->reg_write(context
, reg
, val
);
1630 * regmap_write(): Write a value to a single register
1632 * @map: Register map to write to
1633 * @reg: Register to write to
1634 * @val: Value to be written
1636 * A value of zero will be returned on success, a negative errno will
1637 * be returned in error cases.
1639 int regmap_write(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1643 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1646 map
->lock(map
->lock_arg
);
1648 ret
= _regmap_write(map
, reg
, val
);
1650 map
->unlock(map
->lock_arg
);
1654 EXPORT_SYMBOL_GPL(regmap_write
);
1657 * regmap_write_async(): Write a value to a single register asynchronously
1659 * @map: Register map to write to
1660 * @reg: Register to write to
1661 * @val: Value to be written
1663 * A value of zero will be returned on success, a negative errno will
1664 * be returned in error cases.
1666 int regmap_write_async(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1670 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1673 map
->lock(map
->lock_arg
);
1677 ret
= _regmap_write(map
, reg
, val
);
1681 map
->unlock(map
->lock_arg
);
1685 EXPORT_SYMBOL_GPL(regmap_write_async
);
1688 * regmap_raw_write(): Write raw values to one or more registers
1690 * @map: Register map to write to
1691 * @reg: Initial register to write to
1692 * @val: Block of data to be written, laid out for direct transmission to the
1694 * @val_len: Length of data pointed to by val.
1696 * This function is intended to be used for things like firmware
1697 * download where a large block of data needs to be transferred to the
1698 * device. No formatting will be done on the data provided.
1700 * A value of zero will be returned on success, a negative errno will
1701 * be returned in error cases.
1703 int regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1704 const void *val
, size_t val_len
)
1708 if (!regmap_can_raw_write(map
))
1710 if (val_len
% map
->format
.val_bytes
)
1712 if (map
->max_raw_write
&& map
->max_raw_write
> val_len
)
1715 map
->lock(map
->lock_arg
);
1717 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
1719 map
->unlock(map
->lock_arg
);
1723 EXPORT_SYMBOL_GPL(regmap_raw_write
);
1726 * regmap_field_update_bits_base():
1727 * Perform a read/modify/write cycle on the register field
1728 * with change, async, force option
1730 * @field: Register field to write to
1731 * @mask: Bitmask to change
1732 * @val: Value to be written
1733 * @change: Boolean indicating if a write was done
1734 * @async: Boolean indicating asynchronously
1735 * @force: Boolean indicating use force update
1737 * A value of zero will be returned on success, a negative errno will
1738 * be returned in error cases.
1740 int regmap_field_update_bits_base(struct regmap_field
*field
,
1741 unsigned int mask
, unsigned int val
,
1742 bool *change
, bool async
, bool force
)
1744 mask
= (mask
<< field
->shift
) & field
->mask
;
1746 return regmap_update_bits_base(field
->regmap
, field
->reg
,
1747 mask
, val
<< field
->shift
,
1748 change
, async
, force
);
1750 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base
);
1753 * regmap_fields_update_bits_base():
1754 * Perform a read/modify/write cycle on the register field
1755 * with change, async, force option
1757 * @field: Register field to write to
1759 * @mask: Bitmask to change
1760 * @val: Value to be written
1761 * @change: Boolean indicating if a write was done
1762 * @async: Boolean indicating asynchronously
1763 * @force: Boolean indicating use force update
1765 * A value of zero will be returned on success, a negative errno will
1766 * be returned in error cases.
1768 int regmap_fields_update_bits_base(struct regmap_field
*field
, unsigned int id
,
1769 unsigned int mask
, unsigned int val
,
1770 bool *change
, bool async
, bool force
)
1772 if (id
>= field
->id_size
)
1775 mask
= (mask
<< field
->shift
) & field
->mask
;
1777 return regmap_update_bits_base(field
->regmap
,
1778 field
->reg
+ (field
->id_offset
* id
),
1779 mask
, val
<< field
->shift
,
1780 change
, async
, force
);
1782 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base
);
1785 * regmap_bulk_write(): Write multiple registers to the device
1787 * @map: Register map to write to
1788 * @reg: First register to be write from
1789 * @val: Block of data to be written, in native register size for device
1790 * @val_count: Number of registers to write
1792 * This function is intended to be used for writing a large block of
1793 * data to the device either in single transfer or multiple transfer.
1795 * A value of zero will be returned on success, a negative errno will
1796 * be returned in error cases.
1798 int regmap_bulk_write(struct regmap
*map
, unsigned int reg
, const void *val
,
1802 size_t val_bytes
= map
->format
.val_bytes
;
1803 size_t total_size
= val_bytes
* val_count
;
1805 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1809 * Some devices don't support bulk write, for
1810 * them we have a series of single write operations in the first two if
1813 * The first if block is used for memory mapped io. It does not allow
1814 * val_bytes of 3 for example.
1815 * The second one is for busses that do not provide raw I/O.
1816 * The third one is used for busses which do not have these limitations
1817 * and can write arbitrary value lengths.
1820 map
->lock(map
->lock_arg
);
1821 for (i
= 0; i
< val_count
; i
++) {
1824 switch (val_bytes
) {
1826 ival
= *(u8
*)(val
+ (i
* val_bytes
));
1829 ival
= *(u16
*)(val
+ (i
* val_bytes
));
1832 ival
= *(u32
*)(val
+ (i
* val_bytes
));
1836 ival
= *(u64
*)(val
+ (i
* val_bytes
));
1844 ret
= _regmap_write(map
,
1845 reg
+ regmap_get_offset(map
, i
),
1851 map
->unlock(map
->lock_arg
);
1852 } else if (map
->bus
&& !map
->format
.parse_inplace
) {
1854 const u16
*u16
= val
;
1855 const u32
*u32
= val
;
1858 for (i
= 0; i
< val_count
; i
++) {
1859 switch (map
->format
.val_bytes
) {
1873 ret
= regmap_write(map
, reg
+ (i
* map
->reg_stride
),
1878 } else if (map
->use_single_write
||
1879 (map
->max_raw_write
&& map
->max_raw_write
< total_size
)) {
1880 int chunk_stride
= map
->reg_stride
;
1881 size_t chunk_size
= val_bytes
;
1882 size_t chunk_count
= val_count
;
1884 if (!map
->use_single_write
) {
1885 chunk_size
= map
->max_raw_write
;
1886 if (chunk_size
% val_bytes
)
1887 chunk_size
-= chunk_size
% val_bytes
;
1888 chunk_count
= total_size
/ chunk_size
;
1889 chunk_stride
*= chunk_size
/ val_bytes
;
1892 map
->lock(map
->lock_arg
);
1893 /* Write as many bytes as possible with chunk_size */
1894 for (i
= 0; i
< chunk_count
; i
++) {
1895 ret
= _regmap_raw_write(map
,
1896 reg
+ (i
* chunk_stride
),
1897 val
+ (i
* chunk_size
),
1903 /* Write remaining bytes */
1904 if (!ret
&& chunk_size
* i
< total_size
) {
1905 ret
= _regmap_raw_write(map
, reg
+ (i
* chunk_stride
),
1906 val
+ (i
* chunk_size
),
1907 total_size
- i
* chunk_size
);
1909 map
->unlock(map
->lock_arg
);
1916 wval
= kmemdup(val
, val_count
* val_bytes
, map
->alloc_flags
);
1918 dev_err(map
->dev
, "Error in memory allocation\n");
1921 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
1922 map
->format
.parse_inplace(wval
+ i
);
1924 map
->lock(map
->lock_arg
);
1925 ret
= _regmap_raw_write(map
, reg
, wval
, val_bytes
* val_count
);
1926 map
->unlock(map
->lock_arg
);
1932 EXPORT_SYMBOL_GPL(regmap_bulk_write
);
1935 * _regmap_raw_multi_reg_write()
1937 * the (register,newvalue) pairs in regs have not been formatted, but
1938 * they are all in the same page and have been changed to being page
1939 * relative. The page register has been written if that was necessary.
1941 static int _regmap_raw_multi_reg_write(struct regmap
*map
,
1942 const struct reg_sequence
*regs
,
1949 size_t val_bytes
= map
->format
.val_bytes
;
1950 size_t reg_bytes
= map
->format
.reg_bytes
;
1951 size_t pad_bytes
= map
->format
.pad_bytes
;
1952 size_t pair_size
= reg_bytes
+ pad_bytes
+ val_bytes
;
1953 size_t len
= pair_size
* num_regs
;
1958 buf
= kzalloc(len
, GFP_KERNEL
);
1962 /* We have to linearise by hand. */
1966 for (i
= 0; i
< num_regs
; i
++) {
1967 unsigned int reg
= regs
[i
].reg
;
1968 unsigned int val
= regs
[i
].def
;
1969 trace_regmap_hw_write_start(map
, reg
, 1);
1970 map
->format
.format_reg(u8
, reg
, map
->reg_shift
);
1971 u8
+= reg_bytes
+ pad_bytes
;
1972 map
->format
.format_val(u8
, val
, 0);
1976 *u8
|= map
->write_flag_mask
;
1978 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1982 for (i
= 0; i
< num_regs
; i
++) {
1983 int reg
= regs
[i
].reg
;
1984 trace_regmap_hw_write_done(map
, reg
, 1);
1989 static unsigned int _regmap_register_page(struct regmap
*map
,
1991 struct regmap_range_node
*range
)
1993 unsigned int win_page
= (reg
- range
->range_min
) / range
->window_len
;
1998 static int _regmap_range_multi_paged_reg_write(struct regmap
*map
,
1999 struct reg_sequence
*regs
,
2004 struct reg_sequence
*base
;
2005 unsigned int this_page
= 0;
2006 unsigned int page_change
= 0;
2008 * the set of registers are not neccessarily in order, but
2009 * since the order of write must be preserved this algorithm
2010 * chops the set each time the page changes. This also applies
2011 * if there is a delay required at any point in the sequence.
2014 for (i
= 0, n
= 0; i
< num_regs
; i
++, n
++) {
2015 unsigned int reg
= regs
[i
].reg
;
2016 struct regmap_range_node
*range
;
2018 range
= _regmap_range_lookup(map
, reg
);
2020 unsigned int win_page
= _regmap_register_page(map
, reg
,
2024 this_page
= win_page
;
2025 if (win_page
!= this_page
) {
2026 this_page
= win_page
;
2031 /* If we have both a page change and a delay make sure to
2032 * write the regs and apply the delay before we change the
2036 if (page_change
|| regs
[i
].delay_us
) {
2038 /* For situations where the first write requires
2039 * a delay we need to make sure we don't call
2040 * raw_multi_reg_write with n=0
2041 * This can't occur with page breaks as we
2042 * never write on the first iteration
2044 if (regs
[i
].delay_us
&& i
== 0)
2047 ret
= _regmap_raw_multi_reg_write(map
, base
, n
);
2051 if (regs
[i
].delay_us
)
2052 udelay(regs
[i
].delay_us
);
2058 ret
= _regmap_select_page(map
,
2071 return _regmap_raw_multi_reg_write(map
, base
, n
);
2075 static int _regmap_multi_reg_write(struct regmap
*map
,
2076 const struct reg_sequence
*regs
,
2082 if (!map
->can_multi_write
) {
2083 for (i
= 0; i
< num_regs
; i
++) {
2084 ret
= _regmap_write(map
, regs
[i
].reg
, regs
[i
].def
);
2088 if (regs
[i
].delay_us
)
2089 udelay(regs
[i
].delay_us
);
2094 if (!map
->format
.parse_inplace
)
2097 if (map
->writeable_reg
)
2098 for (i
= 0; i
< num_regs
; i
++) {
2099 int reg
= regs
[i
].reg
;
2100 if (!map
->writeable_reg(map
->dev
, reg
))
2102 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2106 if (!map
->cache_bypass
) {
2107 for (i
= 0; i
< num_regs
; i
++) {
2108 unsigned int val
= regs
[i
].def
;
2109 unsigned int reg
= regs
[i
].reg
;
2110 ret
= regcache_write(map
, reg
, val
);
2113 "Error in caching of register: %x ret: %d\n",
2118 if (map
->cache_only
) {
2119 map
->cache_dirty
= true;
2126 for (i
= 0; i
< num_regs
; i
++) {
2127 unsigned int reg
= regs
[i
].reg
;
2128 struct regmap_range_node
*range
;
2130 /* Coalesce all the writes between a page break or a delay
2133 range
= _regmap_range_lookup(map
, reg
);
2134 if (range
|| regs
[i
].delay_us
) {
2135 size_t len
= sizeof(struct reg_sequence
)*num_regs
;
2136 struct reg_sequence
*base
= kmemdup(regs
, len
,
2140 ret
= _regmap_range_multi_paged_reg_write(map
, base
,
2147 return _regmap_raw_multi_reg_write(map
, regs
, num_regs
);
2151 * regmap_multi_reg_write(): Write multiple registers to the device
2153 * where the set of register,value pairs are supplied in any order,
2154 * possibly not all in a single range.
2156 * @map: Register map to write to
2157 * @regs: Array of structures containing register,value to be written
2158 * @num_regs: Number of registers to write
2160 * The 'normal' block write mode will send ultimately send data on the
2161 * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
2162 * addressed. However, this alternative block multi write mode will send
2163 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2164 * must of course support the mode.
2166 * A value of zero will be returned on success, a negative errno will be
2167 * returned in error cases.
2169 int regmap_multi_reg_write(struct regmap
*map
, const struct reg_sequence
*regs
,
2174 map
->lock(map
->lock_arg
);
2176 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2178 map
->unlock(map
->lock_arg
);
2182 EXPORT_SYMBOL_GPL(regmap_multi_reg_write
);
2185 * regmap_multi_reg_write_bypassed(): Write multiple registers to the
2186 * device but not the cache
2188 * where the set of register are supplied in any order
2190 * @map: Register map to write to
2191 * @regs: Array of structures containing register,value to be written
2192 * @num_regs: Number of registers to write
2194 * This function is intended to be used for writing a large block of data
2195 * atomically to the device in single transfer for those I2C client devices
2196 * that implement this alternative block write mode.
2198 * A value of zero will be returned on success, a negative errno will
2199 * be returned in error cases.
2201 int regmap_multi_reg_write_bypassed(struct regmap
*map
,
2202 const struct reg_sequence
*regs
,
2208 map
->lock(map
->lock_arg
);
2210 bypass
= map
->cache_bypass
;
2211 map
->cache_bypass
= true;
2213 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2215 map
->cache_bypass
= bypass
;
2217 map
->unlock(map
->lock_arg
);
2221 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed
);
2224 * regmap_raw_write_async(): Write raw values to one or more registers
2227 * @map: Register map to write to
2228 * @reg: Initial register to write to
2229 * @val: Block of data to be written, laid out for direct transmission to the
2230 * device. Must be valid until regmap_async_complete() is called.
2231 * @val_len: Length of data pointed to by val.
2233 * This function is intended to be used for things like firmware
2234 * download where a large block of data needs to be transferred to the
2235 * device. No formatting will be done on the data provided.
2237 * If supported by the underlying bus the write will be scheduled
2238 * asynchronously, helping maximise I/O speed on higher speed buses
2239 * like SPI. regmap_async_complete() can be called to ensure that all
2240 * asynchrnous writes have been completed.
2242 * A value of zero will be returned on success, a negative errno will
2243 * be returned in error cases.
2245 int regmap_raw_write_async(struct regmap
*map
, unsigned int reg
,
2246 const void *val
, size_t val_len
)
2250 if (val_len
% map
->format
.val_bytes
)
2252 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2255 map
->lock(map
->lock_arg
);
2259 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
2263 map
->unlock(map
->lock_arg
);
2267 EXPORT_SYMBOL_GPL(regmap_raw_write_async
);
2269 static int _regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2270 unsigned int val_len
)
2272 struct regmap_range_node
*range
;
2273 u8
*u8
= map
->work_buf
;
2278 if (!map
->bus
|| !map
->bus
->read
)
2281 range
= _regmap_range_lookup(map
, reg
);
2283 ret
= _regmap_select_page(map
, ®
, range
,
2284 val_len
/ map
->format
.val_bytes
);
2289 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
2292 * Some buses or devices flag reads by setting the high bits in the
2293 * register address; since it's always the high bits for all
2294 * current formats we can do this here rather than in
2295 * formatting. This may break if we get interesting formats.
2297 u8
[0] |= map
->read_flag_mask
;
2299 trace_regmap_hw_read_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
2301 ret
= map
->bus
->read(map
->bus_context
, map
->work_buf
,
2302 map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
2305 trace_regmap_hw_read_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
2310 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
2313 struct regmap
*map
= context
;
2315 return map
->bus
->reg_read(map
->bus_context
, reg
, val
);
2318 static int _regmap_bus_read(void *context
, unsigned int reg
,
2322 struct regmap
*map
= context
;
2324 if (!map
->format
.parse_val
)
2327 ret
= _regmap_raw_read(map
, reg
, map
->work_buf
, map
->format
.val_bytes
);
2329 *val
= map
->format
.parse_val(map
->work_buf
);
2334 static int _regmap_read(struct regmap
*map
, unsigned int reg
,
2338 void *context
= _regmap_map_get_context(map
);
2340 if (!map
->cache_bypass
) {
2341 ret
= regcache_read(map
, reg
, val
);
2346 if (map
->cache_only
)
2349 if (!regmap_readable(map
, reg
))
2352 ret
= map
->reg_read(context
, reg
, val
);
2355 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
2356 dev_info(map
->dev
, "%x => %x\n", reg
, *val
);
2359 trace_regmap_reg_read(map
, reg
, *val
);
2361 if (!map
->cache_bypass
)
2362 regcache_write(map
, reg
, *val
);
2369 * regmap_read(): Read a value from a single register
2371 * @map: Register map to read from
2372 * @reg: Register to be read from
2373 * @val: Pointer to store read value
2375 * A value of zero will be returned on success, a negative errno will
2376 * be returned in error cases.
2378 int regmap_read(struct regmap
*map
, unsigned int reg
, unsigned int *val
)
2382 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2385 map
->lock(map
->lock_arg
);
2387 ret
= _regmap_read(map
, reg
, val
);
2389 map
->unlock(map
->lock_arg
);
2393 EXPORT_SYMBOL_GPL(regmap_read
);
2396 * regmap_raw_read(): Read raw data from the device
2398 * @map: Register map to read from
2399 * @reg: First register to be read from
2400 * @val: Pointer to store read value
2401 * @val_len: Size of data to read
2403 * A value of zero will be returned on success, a negative errno will
2404 * be returned in error cases.
2406 int regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2409 size_t val_bytes
= map
->format
.val_bytes
;
2410 size_t val_count
= val_len
/ val_bytes
;
2416 if (val_len
% map
->format
.val_bytes
)
2418 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2423 map
->lock(map
->lock_arg
);
2425 if (regmap_volatile_range(map
, reg
, val_count
) || map
->cache_bypass
||
2426 map
->cache_type
== REGCACHE_NONE
) {
2427 if (!map
->bus
->read
) {
2431 if (map
->max_raw_read
&& map
->max_raw_read
< val_len
) {
2436 /* Physical block read if there's no cache involved */
2437 ret
= _regmap_raw_read(map
, reg
, val
, val_len
);
2440 /* Otherwise go word by word for the cache; should be low
2441 * cost as we expect to hit the cache.
2443 for (i
= 0; i
< val_count
; i
++) {
2444 ret
= _regmap_read(map
, reg
+ regmap_get_offset(map
, i
),
2449 map
->format
.format_val(val
+ (i
* val_bytes
), v
, 0);
2454 map
->unlock(map
->lock_arg
);
2458 EXPORT_SYMBOL_GPL(regmap_raw_read
);
2461 * regmap_field_read(): Read a value to a single register field
2463 * @field: Register field to read from
2464 * @val: Pointer to store read value
2466 * A value of zero will be returned on success, a negative errno will
2467 * be returned in error cases.
2469 int regmap_field_read(struct regmap_field
*field
, unsigned int *val
)
2472 unsigned int reg_val
;
2473 ret
= regmap_read(field
->regmap
, field
->reg
, ®_val
);
2477 reg_val
&= field
->mask
;
2478 reg_val
>>= field
->shift
;
2483 EXPORT_SYMBOL_GPL(regmap_field_read
);
2486 * regmap_fields_read(): Read a value to a single register field with port ID
2488 * @field: Register field to read from
2490 * @val: Pointer to store read value
2492 * A value of zero will be returned on success, a negative errno will
2493 * be returned in error cases.
2495 int regmap_fields_read(struct regmap_field
*field
, unsigned int id
,
2499 unsigned int reg_val
;
2501 if (id
>= field
->id_size
)
2504 ret
= regmap_read(field
->regmap
,
2505 field
->reg
+ (field
->id_offset
* id
),
2510 reg_val
&= field
->mask
;
2511 reg_val
>>= field
->shift
;
2516 EXPORT_SYMBOL_GPL(regmap_fields_read
);
2519 * regmap_bulk_read(): Read multiple registers from the device
2521 * @map: Register map to read from
2522 * @reg: First register to be read from
2523 * @val: Pointer to store read value, in native register size for device
2524 * @val_count: Number of registers to read
2526 * A value of zero will be returned on success, a negative errno will
2527 * be returned in error cases.
2529 int regmap_bulk_read(struct regmap
*map
, unsigned int reg
, void *val
,
2533 size_t val_bytes
= map
->format
.val_bytes
;
2534 bool vol
= regmap_volatile_range(map
, reg
, val_count
);
2536 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2539 if (map
->bus
&& map
->format
.parse_inplace
&& (vol
|| map
->cache_type
== REGCACHE_NONE
)) {
2541 * Some devices does not support bulk read, for
2542 * them we have a series of single read operations.
2544 size_t total_size
= val_bytes
* val_count
;
2546 if (!map
->use_single_read
&&
2547 (!map
->max_raw_read
|| map
->max_raw_read
> total_size
)) {
2548 ret
= regmap_raw_read(map
, reg
, val
,
2549 val_bytes
* val_count
);
2554 * Some devices do not support bulk read or do not
2555 * support large bulk reads, for them we have a series
2556 * of read operations.
2558 int chunk_stride
= map
->reg_stride
;
2559 size_t chunk_size
= val_bytes
;
2560 size_t chunk_count
= val_count
;
2562 if (!map
->use_single_read
) {
2563 chunk_size
= map
->max_raw_read
;
2564 if (chunk_size
% val_bytes
)
2565 chunk_size
-= chunk_size
% val_bytes
;
2566 chunk_count
= total_size
/ chunk_size
;
2567 chunk_stride
*= chunk_size
/ val_bytes
;
2570 /* Read bytes that fit into a multiple of chunk_size */
2571 for (i
= 0; i
< chunk_count
; i
++) {
2572 ret
= regmap_raw_read(map
,
2573 reg
+ (i
* chunk_stride
),
2574 val
+ (i
* chunk_size
),
2580 /* Read remaining bytes */
2581 if (chunk_size
* i
< total_size
) {
2582 ret
= regmap_raw_read(map
,
2583 reg
+ (i
* chunk_stride
),
2584 val
+ (i
* chunk_size
),
2585 total_size
- i
* chunk_size
);
2591 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
2592 map
->format
.parse_inplace(val
+ i
);
2594 for (i
= 0; i
< val_count
; i
++) {
2596 ret
= regmap_read(map
, reg
+ regmap_get_offset(map
, i
),
2601 if (map
->format
.format_val
) {
2602 map
->format
.format_val(val
+ (i
* val_bytes
), ival
, 0);
2604 /* Devices providing read and write
2605 * operations can use the bulk I/O
2606 * functions if they define a val_bytes,
2607 * we assume that the values are native
2617 switch (map
->format
.val_bytes
) {
2641 EXPORT_SYMBOL_GPL(regmap_bulk_read
);
2643 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
2644 unsigned int mask
, unsigned int val
,
2645 bool *change
, bool force_write
)
2648 unsigned int tmp
, orig
;
2653 if (regmap_volatile(map
, reg
) && map
->reg_update_bits
) {
2654 ret
= map
->reg_update_bits(map
->bus_context
, reg
, mask
, val
);
2655 if (ret
== 0 && change
)
2658 ret
= _regmap_read(map
, reg
, &orig
);
2665 if (force_write
|| (tmp
!= orig
)) {
2666 ret
= _regmap_write(map
, reg
, tmp
);
2667 if (ret
== 0 && change
)
2676 * regmap_update_bits_base:
2677 * Perform a read/modify/write cycle on the
2678 * register map with change, async, force option
2680 * @map: Register map to update
2681 * @reg: Register to update
2682 * @mask: Bitmask to change
2683 * @val: New value for bitmask
2684 * @change: Boolean indicating if a write was done
2685 * @async: Boolean indicating asynchronously
2686 * @force: Boolean indicating use force update
2688 * if async was true,
2689 * With most buses the read must be done synchronously so this is most
2690 * useful for devices with a cache which do not need to interact with
2691 * the hardware to determine the current register value.
2693 * Returns zero for success, a negative number on error.
2695 int regmap_update_bits_base(struct regmap
*map
, unsigned int reg
,
2696 unsigned int mask
, unsigned int val
,
2697 bool *change
, bool async
, bool force
)
2701 map
->lock(map
->lock_arg
);
2705 ret
= _regmap_update_bits(map
, reg
, mask
, val
, change
, force
);
2709 map
->unlock(map
->lock_arg
);
2713 EXPORT_SYMBOL_GPL(regmap_update_bits_base
);
2715 void regmap_async_complete_cb(struct regmap_async
*async
, int ret
)
2717 struct regmap
*map
= async
->map
;
2720 trace_regmap_async_io_complete(map
);
2722 spin_lock(&map
->async_lock
);
2723 list_move(&async
->list
, &map
->async_free
);
2724 wake
= list_empty(&map
->async_list
);
2727 map
->async_ret
= ret
;
2729 spin_unlock(&map
->async_lock
);
2732 wake_up(&map
->async_waitq
);
2734 EXPORT_SYMBOL_GPL(regmap_async_complete_cb
);
2736 static int regmap_async_is_done(struct regmap
*map
)
2738 unsigned long flags
;
2741 spin_lock_irqsave(&map
->async_lock
, flags
);
2742 ret
= list_empty(&map
->async_list
);
2743 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2749 * regmap_async_complete: Ensure all asynchronous I/O has completed.
2751 * @map: Map to operate on.
2753 * Blocks until any pending asynchronous I/O has completed. Returns
2754 * an error code for any failed I/O operations.
2756 int regmap_async_complete(struct regmap
*map
)
2758 unsigned long flags
;
2761 /* Nothing to do with no async support */
2762 if (!map
->bus
|| !map
->bus
->async_write
)
2765 trace_regmap_async_complete_start(map
);
2767 wait_event(map
->async_waitq
, regmap_async_is_done(map
));
2769 spin_lock_irqsave(&map
->async_lock
, flags
);
2770 ret
= map
->async_ret
;
2772 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2774 trace_regmap_async_complete_done(map
);
2778 EXPORT_SYMBOL_GPL(regmap_async_complete
);
2781 * regmap_register_patch: Register and apply register updates to be applied
2782 * on device initialistion
2784 * @map: Register map to apply updates to.
2785 * @regs: Values to update.
2786 * @num_regs: Number of entries in regs.
2788 * Register a set of register updates to be applied to the device
2789 * whenever the device registers are synchronised with the cache and
2790 * apply them immediately. Typically this is used to apply
2791 * corrections to be applied to the device defaults on startup, such
2792 * as the updates some vendors provide to undocumented registers.
2794 * The caller must ensure that this function cannot be called
2795 * concurrently with either itself or regcache_sync().
2797 int regmap_register_patch(struct regmap
*map
, const struct reg_sequence
*regs
,
2800 struct reg_sequence
*p
;
2804 if (WARN_ONCE(num_regs
<= 0, "invalid registers number (%d)\n",
2808 p
= krealloc(map
->patch
,
2809 sizeof(struct reg_sequence
) * (map
->patch_regs
+ num_regs
),
2812 memcpy(p
+ map
->patch_regs
, regs
, num_regs
* sizeof(*regs
));
2814 map
->patch_regs
+= num_regs
;
2819 map
->lock(map
->lock_arg
);
2821 bypass
= map
->cache_bypass
;
2823 map
->cache_bypass
= true;
2826 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2829 map
->cache_bypass
= bypass
;
2831 map
->unlock(map
->lock_arg
);
2833 regmap_async_complete(map
);
2837 EXPORT_SYMBOL_GPL(regmap_register_patch
);
2840 * regmap_get_val_bytes(): Report the size of a register value
2842 * Report the size of a register value, mainly intended to for use by
2843 * generic infrastructure built on top of regmap.
2845 int regmap_get_val_bytes(struct regmap
*map
)
2847 if (map
->format
.format_write
)
2850 return map
->format
.val_bytes
;
2852 EXPORT_SYMBOL_GPL(regmap_get_val_bytes
);
2855 * regmap_get_max_register(): Report the max register value
2857 * Report the max register value, mainly intended to for use by
2858 * generic infrastructure built on top of regmap.
2860 int regmap_get_max_register(struct regmap
*map
)
2862 return map
->max_register
? map
->max_register
: -EINVAL
;
2864 EXPORT_SYMBOL_GPL(regmap_get_max_register
);
2867 * regmap_get_reg_stride(): Report the register address stride
2869 * Report the register address stride, mainly intended to for use by
2870 * generic infrastructure built on top of regmap.
2872 int regmap_get_reg_stride(struct regmap
*map
)
2874 return map
->reg_stride
;
2876 EXPORT_SYMBOL_GPL(regmap_get_reg_stride
);
2878 int regmap_parse_val(struct regmap
*map
, const void *buf
,
2881 if (!map
->format
.parse_val
)
2884 *val
= map
->format
.parse_val(buf
);
2888 EXPORT_SYMBOL_GPL(regmap_parse_val
);
2890 static int __init
regmap_initcall(void)
2892 regmap_debugfs_initcall();
2896 postcore_initcall(regmap_initcall
);