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>
23 #define CREATE_TRACE_POINTS
29 * Sometimes for failures during very early init the trace
30 * infrastructure isn't available early enough to be used. For this
31 * sort of problem defining LOG_DEVICE will add printks for basic
32 * register I/O on a specific device.
36 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
37 unsigned int mask
, unsigned int val
,
38 bool *change
, bool force_write
);
40 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
42 static int _regmap_bus_read(void *context
, unsigned int reg
,
44 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
46 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
48 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
51 bool regmap_reg_in_ranges(unsigned int reg
,
52 const struct regmap_range
*ranges
,
55 const struct regmap_range
*r
;
58 for (i
= 0, r
= ranges
; i
< nranges
; i
++, r
++)
59 if (regmap_reg_in_range(reg
, r
))
63 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges
);
65 bool regmap_check_range_table(struct regmap
*map
, unsigned int reg
,
66 const struct regmap_access_table
*table
)
68 /* Check "no ranges" first */
69 if (regmap_reg_in_ranges(reg
, table
->no_ranges
, table
->n_no_ranges
))
72 /* In case zero "yes ranges" are supplied, any reg is OK */
73 if (!table
->n_yes_ranges
)
76 return regmap_reg_in_ranges(reg
, table
->yes_ranges
,
79 EXPORT_SYMBOL_GPL(regmap_check_range_table
);
81 bool regmap_writeable(struct regmap
*map
, unsigned int reg
)
83 if (map
->max_register
&& reg
> map
->max_register
)
86 if (map
->writeable_reg
)
87 return map
->writeable_reg(map
->dev
, reg
);
90 return regmap_check_range_table(map
, reg
, map
->wr_table
);
95 bool regmap_readable(struct regmap
*map
, unsigned int reg
)
100 if (map
->max_register
&& reg
> map
->max_register
)
103 if (map
->format
.format_write
)
106 if (map
->readable_reg
)
107 return map
->readable_reg(map
->dev
, reg
);
110 return regmap_check_range_table(map
, reg
, map
->rd_table
);
115 bool regmap_volatile(struct regmap
*map
, unsigned int reg
)
117 if (!map
->format
.format_write
&& !regmap_readable(map
, reg
))
120 if (map
->volatile_reg
)
121 return map
->volatile_reg(map
->dev
, reg
);
123 if (map
->volatile_table
)
124 return regmap_check_range_table(map
, reg
, map
->volatile_table
);
132 bool regmap_precious(struct regmap
*map
, unsigned int reg
)
134 if (!regmap_readable(map
, reg
))
137 if (map
->precious_reg
)
138 return map
->precious_reg(map
->dev
, reg
);
140 if (map
->precious_table
)
141 return regmap_check_range_table(map
, reg
, map
->precious_table
);
146 static bool regmap_volatile_range(struct regmap
*map
, unsigned int reg
,
151 for (i
= 0; i
< num
; i
++)
152 if (!regmap_volatile(map
, reg
+ i
))
158 static void regmap_format_2_6_write(struct regmap
*map
,
159 unsigned int reg
, unsigned int val
)
161 u8
*out
= map
->work_buf
;
163 *out
= (reg
<< 6) | val
;
166 static void regmap_format_4_12_write(struct regmap
*map
,
167 unsigned int reg
, unsigned int val
)
169 __be16
*out
= map
->work_buf
;
170 *out
= cpu_to_be16((reg
<< 12) | val
);
173 static void regmap_format_7_9_write(struct regmap
*map
,
174 unsigned int reg
, unsigned int val
)
176 __be16
*out
= map
->work_buf
;
177 *out
= cpu_to_be16((reg
<< 9) | val
);
180 static void regmap_format_10_14_write(struct regmap
*map
,
181 unsigned int reg
, unsigned int val
)
183 u8
*out
= map
->work_buf
;
186 out
[1] = (val
>> 8) | (reg
<< 6);
190 static void regmap_format_8(void *buf
, unsigned int val
, unsigned int shift
)
197 static void regmap_format_16_be(void *buf
, unsigned int val
, unsigned int shift
)
201 b
[0] = cpu_to_be16(val
<< shift
);
204 static void regmap_format_16_le(void *buf
, unsigned int val
, unsigned int shift
)
208 b
[0] = cpu_to_le16(val
<< shift
);
211 static void regmap_format_16_native(void *buf
, unsigned int val
,
214 *(u16
*)buf
= val
<< shift
;
217 static void regmap_format_24(void *buf
, unsigned int val
, unsigned int shift
)
228 static void regmap_format_32_be(void *buf
, unsigned int val
, unsigned int shift
)
232 b
[0] = cpu_to_be32(val
<< shift
);
235 static void regmap_format_32_le(void *buf
, unsigned int val
, unsigned int shift
)
239 b
[0] = cpu_to_le32(val
<< shift
);
242 static void regmap_format_32_native(void *buf
, unsigned int val
,
245 *(u32
*)buf
= val
<< shift
;
249 static void regmap_format_64_be(void *buf
, unsigned int val
, unsigned int shift
)
253 b
[0] = cpu_to_be64((u64
)val
<< shift
);
256 static void regmap_format_64_le(void *buf
, unsigned int val
, unsigned int shift
)
260 b
[0] = cpu_to_le64((u64
)val
<< shift
);
263 static void regmap_format_64_native(void *buf
, unsigned int val
,
266 *(u64
*)buf
= (u64
)val
<< shift
;
270 static void regmap_parse_inplace_noop(void *buf
)
274 static unsigned int regmap_parse_8(const void *buf
)
281 static unsigned int regmap_parse_16_be(const void *buf
)
283 const __be16
*b
= buf
;
285 return be16_to_cpu(b
[0]);
288 static unsigned int regmap_parse_16_le(const void *buf
)
290 const __le16
*b
= buf
;
292 return le16_to_cpu(b
[0]);
295 static void regmap_parse_16_be_inplace(void *buf
)
299 b
[0] = be16_to_cpu(b
[0]);
302 static void regmap_parse_16_le_inplace(void *buf
)
306 b
[0] = le16_to_cpu(b
[0]);
309 static unsigned int regmap_parse_16_native(const void *buf
)
314 static unsigned int regmap_parse_24(const void *buf
)
317 unsigned int ret
= b
[2];
318 ret
|= ((unsigned int)b
[1]) << 8;
319 ret
|= ((unsigned int)b
[0]) << 16;
324 static unsigned int regmap_parse_32_be(const void *buf
)
326 const __be32
*b
= buf
;
328 return be32_to_cpu(b
[0]);
331 static unsigned int regmap_parse_32_le(const void *buf
)
333 const __le32
*b
= buf
;
335 return le32_to_cpu(b
[0]);
338 static void regmap_parse_32_be_inplace(void *buf
)
342 b
[0] = be32_to_cpu(b
[0]);
345 static void regmap_parse_32_le_inplace(void *buf
)
349 b
[0] = le32_to_cpu(b
[0]);
352 static unsigned int regmap_parse_32_native(const void *buf
)
358 static unsigned int regmap_parse_64_be(const void *buf
)
360 const __be64
*b
= buf
;
362 return be64_to_cpu(b
[0]);
365 static unsigned int regmap_parse_64_le(const void *buf
)
367 const __le64
*b
= buf
;
369 return le64_to_cpu(b
[0]);
372 static void regmap_parse_64_be_inplace(void *buf
)
376 b
[0] = be64_to_cpu(b
[0]);
379 static void regmap_parse_64_le_inplace(void *buf
)
383 b
[0] = le64_to_cpu(b
[0]);
386 static unsigned int regmap_parse_64_native(const void *buf
)
392 static void regmap_lock_mutex(void *__map
)
394 struct regmap
*map
= __map
;
395 mutex_lock(&map
->mutex
);
398 static void regmap_unlock_mutex(void *__map
)
400 struct regmap
*map
= __map
;
401 mutex_unlock(&map
->mutex
);
404 static void regmap_lock_spinlock(void *__map
)
405 __acquires(&map
->spinlock
)
407 struct regmap
*map
= __map
;
410 spin_lock_irqsave(&map
->spinlock
, flags
);
411 map
->spinlock_flags
= flags
;
414 static void regmap_unlock_spinlock(void *__map
)
415 __releases(&map
->spinlock
)
417 struct regmap
*map
= __map
;
418 spin_unlock_irqrestore(&map
->spinlock
, map
->spinlock_flags
);
421 static void dev_get_regmap_release(struct device
*dev
, void *res
)
424 * We don't actually have anything to do here; the goal here
425 * is not to manage the regmap but to provide a simple way to
426 * get the regmap back given a struct device.
430 static bool _regmap_range_add(struct regmap
*map
,
431 struct regmap_range_node
*data
)
433 struct rb_root
*root
= &map
->range_tree
;
434 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
437 struct regmap_range_node
*this =
438 container_of(*new, struct regmap_range_node
, node
);
441 if (data
->range_max
< this->range_min
)
442 new = &((*new)->rb_left
);
443 else if (data
->range_min
> this->range_max
)
444 new = &((*new)->rb_right
);
449 rb_link_node(&data
->node
, parent
, new);
450 rb_insert_color(&data
->node
, root
);
455 static struct regmap_range_node
*_regmap_range_lookup(struct regmap
*map
,
458 struct rb_node
*node
= map
->range_tree
.rb_node
;
461 struct regmap_range_node
*this =
462 container_of(node
, struct regmap_range_node
, node
);
464 if (reg
< this->range_min
)
465 node
= node
->rb_left
;
466 else if (reg
> this->range_max
)
467 node
= node
->rb_right
;
475 static void regmap_range_exit(struct regmap
*map
)
477 struct rb_node
*next
;
478 struct regmap_range_node
*range_node
;
480 next
= rb_first(&map
->range_tree
);
482 range_node
= rb_entry(next
, struct regmap_range_node
, node
);
483 next
= rb_next(&range_node
->node
);
484 rb_erase(&range_node
->node
, &map
->range_tree
);
488 kfree(map
->selector_work_buf
);
491 int regmap_attach_dev(struct device
*dev
, struct regmap
*map
,
492 const struct regmap_config
*config
)
498 regmap_debugfs_init(map
, config
->name
);
500 /* Add a devres resource for dev_get_regmap() */
501 m
= devres_alloc(dev_get_regmap_release
, sizeof(*m
), GFP_KERNEL
);
503 regmap_debugfs_exit(map
);
511 EXPORT_SYMBOL_GPL(regmap_attach_dev
);
513 static enum regmap_endian
regmap_get_reg_endian(const struct regmap_bus
*bus
,
514 const struct regmap_config
*config
)
516 enum regmap_endian endian
;
518 /* Retrieve the endianness specification from the regmap config */
519 endian
= config
->reg_format_endian
;
521 /* If the regmap config specified a non-default value, use that */
522 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
525 /* Retrieve the endianness specification from the bus config */
526 if (bus
&& bus
->reg_format_endian_default
)
527 endian
= bus
->reg_format_endian_default
;
529 /* If the bus specified a non-default value, use that */
530 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
533 /* Use this if no other value was found */
534 return REGMAP_ENDIAN_BIG
;
537 enum regmap_endian
regmap_get_val_endian(struct device
*dev
,
538 const struct regmap_bus
*bus
,
539 const struct regmap_config
*config
)
541 struct device_node
*np
;
542 enum regmap_endian endian
;
544 /* Retrieve the endianness specification from the regmap config */
545 endian
= config
->val_format_endian
;
547 /* If the regmap config specified a non-default value, use that */
548 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
551 /* If the dev and dev->of_node exist try to get endianness from DT */
552 if (dev
&& dev
->of_node
) {
555 /* Parse the device's DT node for an endianness specification */
556 if (of_property_read_bool(np
, "big-endian"))
557 endian
= REGMAP_ENDIAN_BIG
;
558 else if (of_property_read_bool(np
, "little-endian"))
559 endian
= REGMAP_ENDIAN_LITTLE
;
561 /* If the endianness was specified in DT, use that */
562 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
566 /* Retrieve the endianness specification from the bus config */
567 if (bus
&& bus
->val_format_endian_default
)
568 endian
= bus
->val_format_endian_default
;
570 /* If the bus specified a non-default value, use that */
571 if (endian
!= REGMAP_ENDIAN_DEFAULT
)
574 /* Use this if no other value was found */
575 return REGMAP_ENDIAN_BIG
;
577 EXPORT_SYMBOL_GPL(regmap_get_val_endian
);
579 struct regmap
*__regmap_init(struct device
*dev
,
580 const struct regmap_bus
*bus
,
582 const struct regmap_config
*config
,
583 struct lock_class_key
*lock_key
,
584 const char *lock_name
)
588 enum regmap_endian reg_endian
, val_endian
;
594 map
= kzalloc(sizeof(*map
), GFP_KERNEL
);
600 if (config
->lock
&& config
->unlock
) {
601 map
->lock
= config
->lock
;
602 map
->unlock
= config
->unlock
;
603 map
->lock_arg
= config
->lock_arg
;
605 if ((bus
&& bus
->fast_io
) ||
607 spin_lock_init(&map
->spinlock
);
608 map
->lock
= regmap_lock_spinlock
;
609 map
->unlock
= regmap_unlock_spinlock
;
610 lockdep_set_class_and_name(&map
->spinlock
,
611 lock_key
, lock_name
);
613 mutex_init(&map
->mutex
);
614 map
->lock
= regmap_lock_mutex
;
615 map
->unlock
= regmap_unlock_mutex
;
616 lockdep_set_class_and_name(&map
->mutex
,
617 lock_key
, lock_name
);
623 * When we write in fast-paths with regmap_bulk_write() don't allocate
624 * scratch buffers with sleeping allocations.
626 if ((bus
&& bus
->fast_io
) || config
->fast_io
)
627 map
->alloc_flags
= GFP_ATOMIC
;
629 map
->alloc_flags
= GFP_KERNEL
;
631 map
->format
.reg_bytes
= DIV_ROUND_UP(config
->reg_bits
, 8);
632 map
->format
.pad_bytes
= config
->pad_bits
/ 8;
633 map
->format
.val_bytes
= DIV_ROUND_UP(config
->val_bits
, 8);
634 map
->format
.buf_size
= DIV_ROUND_UP(config
->reg_bits
+
635 config
->val_bits
+ config
->pad_bits
, 8);
636 map
->reg_shift
= config
->pad_bits
% 8;
637 if (config
->reg_stride
)
638 map
->reg_stride
= config
->reg_stride
;
641 map
->use_single_read
= config
->use_single_rw
|| !bus
|| !bus
->read
;
642 map
->use_single_write
= config
->use_single_rw
|| !bus
|| !bus
->write
;
643 map
->can_multi_write
= config
->can_multi_write
&& bus
&& bus
->write
;
645 map
->max_raw_read
= bus
->max_raw_read
;
646 map
->max_raw_write
= bus
->max_raw_write
;
650 map
->bus_context
= bus_context
;
651 map
->max_register
= config
->max_register
;
652 map
->wr_table
= config
->wr_table
;
653 map
->rd_table
= config
->rd_table
;
654 map
->volatile_table
= config
->volatile_table
;
655 map
->precious_table
= config
->precious_table
;
656 map
->writeable_reg
= config
->writeable_reg
;
657 map
->readable_reg
= config
->readable_reg
;
658 map
->volatile_reg
= config
->volatile_reg
;
659 map
->precious_reg
= config
->precious_reg
;
660 map
->cache_type
= config
->cache_type
;
661 map
->name
= config
->name
;
663 spin_lock_init(&map
->async_lock
);
664 INIT_LIST_HEAD(&map
->async_list
);
665 INIT_LIST_HEAD(&map
->async_free
);
666 init_waitqueue_head(&map
->async_waitq
);
668 if (config
->read_flag_mask
|| config
->write_flag_mask
) {
669 map
->read_flag_mask
= config
->read_flag_mask
;
670 map
->write_flag_mask
= config
->write_flag_mask
;
672 map
->read_flag_mask
= bus
->read_flag_mask
;
676 map
->reg_read
= config
->reg_read
;
677 map
->reg_write
= config
->reg_write
;
679 map
->defer_caching
= false;
680 goto skip_format_initialization
;
681 } else if (!bus
->read
|| !bus
->write
) {
682 map
->reg_read
= _regmap_bus_reg_read
;
683 map
->reg_write
= _regmap_bus_reg_write
;
685 map
->defer_caching
= false;
686 goto skip_format_initialization
;
688 map
->reg_read
= _regmap_bus_read
;
689 map
->reg_update_bits
= bus
->reg_update_bits
;
692 reg_endian
= regmap_get_reg_endian(bus
, config
);
693 val_endian
= regmap_get_val_endian(dev
, bus
, config
);
695 switch (config
->reg_bits
+ map
->reg_shift
) {
697 switch (config
->val_bits
) {
699 map
->format
.format_write
= regmap_format_2_6_write
;
707 switch (config
->val_bits
) {
709 map
->format
.format_write
= regmap_format_4_12_write
;
717 switch (config
->val_bits
) {
719 map
->format
.format_write
= regmap_format_7_9_write
;
727 switch (config
->val_bits
) {
729 map
->format
.format_write
= regmap_format_10_14_write
;
737 map
->format
.format_reg
= regmap_format_8
;
741 switch (reg_endian
) {
742 case REGMAP_ENDIAN_BIG
:
743 map
->format
.format_reg
= regmap_format_16_be
;
745 case REGMAP_ENDIAN_NATIVE
:
746 map
->format
.format_reg
= regmap_format_16_native
;
754 if (reg_endian
!= REGMAP_ENDIAN_BIG
)
756 map
->format
.format_reg
= regmap_format_24
;
760 switch (reg_endian
) {
761 case REGMAP_ENDIAN_BIG
:
762 map
->format
.format_reg
= regmap_format_32_be
;
764 case REGMAP_ENDIAN_NATIVE
:
765 map
->format
.format_reg
= regmap_format_32_native
;
774 switch (reg_endian
) {
775 case REGMAP_ENDIAN_BIG
:
776 map
->format
.format_reg
= regmap_format_64_be
;
778 case REGMAP_ENDIAN_NATIVE
:
779 map
->format
.format_reg
= regmap_format_64_native
;
791 if (val_endian
== REGMAP_ENDIAN_NATIVE
)
792 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
794 switch (config
->val_bits
) {
796 map
->format
.format_val
= regmap_format_8
;
797 map
->format
.parse_val
= regmap_parse_8
;
798 map
->format
.parse_inplace
= regmap_parse_inplace_noop
;
801 switch (val_endian
) {
802 case REGMAP_ENDIAN_BIG
:
803 map
->format
.format_val
= regmap_format_16_be
;
804 map
->format
.parse_val
= regmap_parse_16_be
;
805 map
->format
.parse_inplace
= regmap_parse_16_be_inplace
;
807 case REGMAP_ENDIAN_LITTLE
:
808 map
->format
.format_val
= regmap_format_16_le
;
809 map
->format
.parse_val
= regmap_parse_16_le
;
810 map
->format
.parse_inplace
= regmap_parse_16_le_inplace
;
812 case REGMAP_ENDIAN_NATIVE
:
813 map
->format
.format_val
= regmap_format_16_native
;
814 map
->format
.parse_val
= regmap_parse_16_native
;
821 if (val_endian
!= REGMAP_ENDIAN_BIG
)
823 map
->format
.format_val
= regmap_format_24
;
824 map
->format
.parse_val
= regmap_parse_24
;
827 switch (val_endian
) {
828 case REGMAP_ENDIAN_BIG
:
829 map
->format
.format_val
= regmap_format_32_be
;
830 map
->format
.parse_val
= regmap_parse_32_be
;
831 map
->format
.parse_inplace
= regmap_parse_32_be_inplace
;
833 case REGMAP_ENDIAN_LITTLE
:
834 map
->format
.format_val
= regmap_format_32_le
;
835 map
->format
.parse_val
= regmap_parse_32_le
;
836 map
->format
.parse_inplace
= regmap_parse_32_le_inplace
;
838 case REGMAP_ENDIAN_NATIVE
:
839 map
->format
.format_val
= regmap_format_32_native
;
840 map
->format
.parse_val
= regmap_parse_32_native
;
848 switch (val_endian
) {
849 case REGMAP_ENDIAN_BIG
:
850 map
->format
.format_val
= regmap_format_64_be
;
851 map
->format
.parse_val
= regmap_parse_64_be
;
852 map
->format
.parse_inplace
= regmap_parse_64_be_inplace
;
854 case REGMAP_ENDIAN_LITTLE
:
855 map
->format
.format_val
= regmap_format_64_le
;
856 map
->format
.parse_val
= regmap_parse_64_le
;
857 map
->format
.parse_inplace
= regmap_parse_64_le_inplace
;
859 case REGMAP_ENDIAN_NATIVE
:
860 map
->format
.format_val
= regmap_format_64_native
;
861 map
->format
.parse_val
= regmap_parse_64_native
;
870 if (map
->format
.format_write
) {
871 if ((reg_endian
!= REGMAP_ENDIAN_BIG
) ||
872 (val_endian
!= REGMAP_ENDIAN_BIG
))
874 map
->use_single_write
= true;
877 if (!map
->format
.format_write
&&
878 !(map
->format
.format_reg
&& map
->format
.format_val
))
881 map
->work_buf
= kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
882 if (map
->work_buf
== NULL
) {
887 if (map
->format
.format_write
) {
888 map
->defer_caching
= false;
889 map
->reg_write
= _regmap_bus_formatted_write
;
890 } else if (map
->format
.format_val
) {
891 map
->defer_caching
= true;
892 map
->reg_write
= _regmap_bus_raw_write
;
895 skip_format_initialization
:
897 map
->range_tree
= RB_ROOT
;
898 for (i
= 0; i
< config
->num_ranges
; i
++) {
899 const struct regmap_range_cfg
*range_cfg
= &config
->ranges
[i
];
900 struct regmap_range_node
*new;
903 if (range_cfg
->range_max
< range_cfg
->range_min
) {
904 dev_err(map
->dev
, "Invalid range %d: %d < %d\n", i
,
905 range_cfg
->range_max
, range_cfg
->range_min
);
909 if (range_cfg
->range_max
> map
->max_register
) {
910 dev_err(map
->dev
, "Invalid range %d: %d > %d\n", i
,
911 range_cfg
->range_max
, map
->max_register
);
915 if (range_cfg
->selector_reg
> map
->max_register
) {
917 "Invalid range %d: selector out of map\n", i
);
921 if (range_cfg
->window_len
== 0) {
922 dev_err(map
->dev
, "Invalid range %d: window_len 0\n",
927 /* Make sure, that this register range has no selector
928 or data window within its boundary */
929 for (j
= 0; j
< config
->num_ranges
; j
++) {
930 unsigned sel_reg
= config
->ranges
[j
].selector_reg
;
931 unsigned win_min
= config
->ranges
[j
].window_start
;
932 unsigned win_max
= win_min
+
933 config
->ranges
[j
].window_len
- 1;
935 /* Allow data window inside its own virtual range */
939 if (range_cfg
->range_min
<= sel_reg
&&
940 sel_reg
<= range_cfg
->range_max
) {
942 "Range %d: selector for %d in window\n",
947 if (!(win_max
< range_cfg
->range_min
||
948 win_min
> range_cfg
->range_max
)) {
950 "Range %d: window for %d in window\n",
956 new = kzalloc(sizeof(*new), GFP_KERNEL
);
963 new->name
= range_cfg
->name
;
964 new->range_min
= range_cfg
->range_min
;
965 new->range_max
= range_cfg
->range_max
;
966 new->selector_reg
= range_cfg
->selector_reg
;
967 new->selector_mask
= range_cfg
->selector_mask
;
968 new->selector_shift
= range_cfg
->selector_shift
;
969 new->window_start
= range_cfg
->window_start
;
970 new->window_len
= range_cfg
->window_len
;
972 if (!_regmap_range_add(map
, new)) {
973 dev_err(map
->dev
, "Failed to add range %d\n", i
);
978 if (map
->selector_work_buf
== NULL
) {
979 map
->selector_work_buf
=
980 kzalloc(map
->format
.buf_size
, GFP_KERNEL
);
981 if (map
->selector_work_buf
== NULL
) {
988 ret
= regcache_init(map
, config
);
993 ret
= regmap_attach_dev(dev
, map
, config
);
1003 regmap_range_exit(map
);
1004 kfree(map
->work_buf
);
1008 return ERR_PTR(ret
);
1010 EXPORT_SYMBOL_GPL(__regmap_init
);
1012 static void devm_regmap_release(struct device
*dev
, void *res
)
1014 regmap_exit(*(struct regmap
**)res
);
1017 struct regmap
*__devm_regmap_init(struct device
*dev
,
1018 const struct regmap_bus
*bus
,
1020 const struct regmap_config
*config
,
1021 struct lock_class_key
*lock_key
,
1022 const char *lock_name
)
1024 struct regmap
**ptr
, *regmap
;
1026 ptr
= devres_alloc(devm_regmap_release
, sizeof(*ptr
), GFP_KERNEL
);
1028 return ERR_PTR(-ENOMEM
);
1030 regmap
= __regmap_init(dev
, bus
, bus_context
, config
,
1031 lock_key
, lock_name
);
1032 if (!IS_ERR(regmap
)) {
1034 devres_add(dev
, ptr
);
1041 EXPORT_SYMBOL_GPL(__devm_regmap_init
);
1043 static void regmap_field_init(struct regmap_field
*rm_field
,
1044 struct regmap
*regmap
, struct reg_field reg_field
)
1046 rm_field
->regmap
= regmap
;
1047 rm_field
->reg
= reg_field
.reg
;
1048 rm_field
->shift
= reg_field
.lsb
;
1049 rm_field
->mask
= GENMASK(reg_field
.msb
, reg_field
.lsb
);
1050 rm_field
->id_size
= reg_field
.id_size
;
1051 rm_field
->id_offset
= reg_field
.id_offset
;
1055 * devm_regmap_field_alloc(): Allocate and initialise a register field
1056 * in a register map.
1058 * @dev: Device that will be interacted with
1059 * @regmap: regmap bank in which this register field is located.
1060 * @reg_field: Register field with in the bank.
1062 * The return value will be an ERR_PTR() on error or a valid pointer
1063 * to a struct regmap_field. The regmap_field will be automatically freed
1064 * by the device management code.
1066 struct regmap_field
*devm_regmap_field_alloc(struct device
*dev
,
1067 struct regmap
*regmap
, struct reg_field reg_field
)
1069 struct regmap_field
*rm_field
= devm_kzalloc(dev
,
1070 sizeof(*rm_field
), GFP_KERNEL
);
1072 return ERR_PTR(-ENOMEM
);
1074 regmap_field_init(rm_field
, regmap
, reg_field
);
1079 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc
);
1082 * devm_regmap_field_free(): Free register field allocated using
1083 * devm_regmap_field_alloc. Usally drivers need not call this function,
1084 * as the memory allocated via devm will be freed as per device-driver
1087 * @dev: Device that will be interacted with
1088 * @field: regmap field which should be freed.
1090 void devm_regmap_field_free(struct device
*dev
,
1091 struct regmap_field
*field
)
1093 devm_kfree(dev
, field
);
1095 EXPORT_SYMBOL_GPL(devm_regmap_field_free
);
1098 * regmap_field_alloc(): Allocate and initialise a register field
1099 * in a register map.
1101 * @regmap: regmap bank in which this register field is located.
1102 * @reg_field: Register field with in the bank.
1104 * The return value will be an ERR_PTR() on error or a valid pointer
1105 * to a struct regmap_field. The regmap_field should be freed by the
1106 * user once its finished working with it using regmap_field_free().
1108 struct regmap_field
*regmap_field_alloc(struct regmap
*regmap
,
1109 struct reg_field reg_field
)
1111 struct regmap_field
*rm_field
= kzalloc(sizeof(*rm_field
), GFP_KERNEL
);
1114 return ERR_PTR(-ENOMEM
);
1116 regmap_field_init(rm_field
, regmap
, reg_field
);
1120 EXPORT_SYMBOL_GPL(regmap_field_alloc
);
1123 * regmap_field_free(): Free register field allocated using regmap_field_alloc
1125 * @field: regmap field which should be freed.
1127 void regmap_field_free(struct regmap_field
*field
)
1131 EXPORT_SYMBOL_GPL(regmap_field_free
);
1134 * regmap_reinit_cache(): Reinitialise the current register cache
1136 * @map: Register map to operate on.
1137 * @config: New configuration. Only the cache data will be used.
1139 * Discard any existing register cache for the map and initialize a
1140 * new cache. This can be used to restore the cache to defaults or to
1141 * update the cache configuration to reflect runtime discovery of the
1144 * No explicit locking is done here, the user needs to ensure that
1145 * this function will not race with other calls to regmap.
1147 int regmap_reinit_cache(struct regmap
*map
, const struct regmap_config
*config
)
1150 regmap_debugfs_exit(map
);
1152 map
->max_register
= config
->max_register
;
1153 map
->writeable_reg
= config
->writeable_reg
;
1154 map
->readable_reg
= config
->readable_reg
;
1155 map
->volatile_reg
= config
->volatile_reg
;
1156 map
->precious_reg
= config
->precious_reg
;
1157 map
->cache_type
= config
->cache_type
;
1159 regmap_debugfs_init(map
, config
->name
);
1161 map
->cache_bypass
= false;
1162 map
->cache_only
= false;
1164 return regcache_init(map
, config
);
1166 EXPORT_SYMBOL_GPL(regmap_reinit_cache
);
1169 * regmap_exit(): Free a previously allocated register map
1171 void regmap_exit(struct regmap
*map
)
1173 struct regmap_async
*async
;
1176 regmap_debugfs_exit(map
);
1177 regmap_range_exit(map
);
1178 if (map
->bus
&& map
->bus
->free_context
)
1179 map
->bus
->free_context(map
->bus_context
);
1180 kfree(map
->work_buf
);
1181 while (!list_empty(&map
->async_free
)) {
1182 async
= list_first_entry_or_null(&map
->async_free
,
1183 struct regmap_async
,
1185 list_del(&async
->list
);
1186 kfree(async
->work_buf
);
1191 EXPORT_SYMBOL_GPL(regmap_exit
);
1193 static int dev_get_regmap_match(struct device
*dev
, void *res
, void *data
)
1195 struct regmap
**r
= res
;
1201 /* If the user didn't specify a name match any */
1203 return (*r
)->name
== data
;
1209 * dev_get_regmap(): Obtain the regmap (if any) for a device
1211 * @dev: Device to retrieve the map for
1212 * @name: Optional name for the register map, usually NULL.
1214 * Returns the regmap for the device if one is present, or NULL. If
1215 * name is specified then it must match the name specified when
1216 * registering the device, if it is NULL then the first regmap found
1217 * will be used. Devices with multiple register maps are very rare,
1218 * generic code should normally not need to specify a name.
1220 struct regmap
*dev_get_regmap(struct device
*dev
, const char *name
)
1222 struct regmap
**r
= devres_find(dev
, dev_get_regmap_release
,
1223 dev_get_regmap_match
, (void *)name
);
1229 EXPORT_SYMBOL_GPL(dev_get_regmap
);
1232 * regmap_get_device(): Obtain the device from a regmap
1234 * @map: Register map to operate on.
1236 * Returns the underlying device that the regmap has been created for.
1238 struct device
*regmap_get_device(struct regmap
*map
)
1242 EXPORT_SYMBOL_GPL(regmap_get_device
);
1244 static int _regmap_select_page(struct regmap
*map
, unsigned int *reg
,
1245 struct regmap_range_node
*range
,
1246 unsigned int val_num
)
1248 void *orig_work_buf
;
1249 unsigned int win_offset
;
1250 unsigned int win_page
;
1254 win_offset
= (*reg
- range
->range_min
) % range
->window_len
;
1255 win_page
= (*reg
- range
->range_min
) / range
->window_len
;
1258 /* Bulk write shouldn't cross range boundary */
1259 if (*reg
+ val_num
- 1 > range
->range_max
)
1262 /* ... or single page boundary */
1263 if (val_num
> range
->window_len
- win_offset
)
1267 /* It is possible to have selector register inside data window.
1268 In that case, selector register is located on every page and
1269 it needs no page switching, when accessed alone. */
1271 range
->window_start
+ win_offset
!= range
->selector_reg
) {
1272 /* Use separate work_buf during page switching */
1273 orig_work_buf
= map
->work_buf
;
1274 map
->work_buf
= map
->selector_work_buf
;
1276 ret
= _regmap_update_bits(map
, range
->selector_reg
,
1277 range
->selector_mask
,
1278 win_page
<< range
->selector_shift
,
1281 map
->work_buf
= orig_work_buf
;
1287 *reg
= range
->window_start
+ win_offset
;
1292 int _regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1293 const void *val
, size_t val_len
)
1295 struct regmap_range_node
*range
;
1296 unsigned long flags
;
1297 u8
*u8
= map
->work_buf
;
1298 void *work_val
= map
->work_buf
+ map
->format
.reg_bytes
+
1299 map
->format
.pad_bytes
;
1301 int ret
= -ENOTSUPP
;
1307 /* Check for unwritable registers before we start */
1308 if (map
->writeable_reg
)
1309 for (i
= 0; i
< val_len
/ map
->format
.val_bytes
; i
++)
1310 if (!map
->writeable_reg(map
->dev
,
1311 reg
+ (i
* map
->reg_stride
)))
1314 if (!map
->cache_bypass
&& map
->format
.parse_val
) {
1316 int val_bytes
= map
->format
.val_bytes
;
1317 for (i
= 0; i
< val_len
/ val_bytes
; i
++) {
1318 ival
= map
->format
.parse_val(val
+ (i
* val_bytes
));
1319 ret
= regcache_write(map
, reg
+ (i
* map
->reg_stride
),
1323 "Error in caching of register: %x ret: %d\n",
1328 if (map
->cache_only
) {
1329 map
->cache_dirty
= true;
1334 range
= _regmap_range_lookup(map
, reg
);
1336 int val_num
= val_len
/ map
->format
.val_bytes
;
1337 int win_offset
= (reg
- range
->range_min
) % range
->window_len
;
1338 int win_residue
= range
->window_len
- win_offset
;
1340 /* If the write goes beyond the end of the window split it */
1341 while (val_num
> win_residue
) {
1342 dev_dbg(map
->dev
, "Writing window %d/%zu\n",
1343 win_residue
, val_len
/ map
->format
.val_bytes
);
1344 ret
= _regmap_raw_write(map
, reg
, val
, win_residue
*
1345 map
->format
.val_bytes
);
1350 val_num
-= win_residue
;
1351 val
+= win_residue
* map
->format
.val_bytes
;
1352 val_len
-= win_residue
* map
->format
.val_bytes
;
1354 win_offset
= (reg
- range
->range_min
) %
1356 win_residue
= range
->window_len
- win_offset
;
1359 ret
= _regmap_select_page(map
, ®
, range
, val_num
);
1364 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
1366 u8
[0] |= map
->write_flag_mask
;
1369 * Essentially all I/O mechanisms will be faster with a single
1370 * buffer to write. Since register syncs often generate raw
1371 * writes of single registers optimise that case.
1373 if (val
!= work_val
&& val_len
== map
->format
.val_bytes
) {
1374 memcpy(work_val
, val
, map
->format
.val_bytes
);
1378 if (map
->async
&& map
->bus
->async_write
) {
1379 struct regmap_async
*async
;
1381 trace_regmap_async_write_start(map
, reg
, val_len
);
1383 spin_lock_irqsave(&map
->async_lock
, flags
);
1384 async
= list_first_entry_or_null(&map
->async_free
,
1385 struct regmap_async
,
1388 list_del(&async
->list
);
1389 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1392 async
= map
->bus
->async_alloc();
1396 async
->work_buf
= kzalloc(map
->format
.buf_size
,
1397 GFP_KERNEL
| GFP_DMA
);
1398 if (!async
->work_buf
) {
1406 /* If the caller supplied the value we can use it safely. */
1407 memcpy(async
->work_buf
, map
->work_buf
, map
->format
.pad_bytes
+
1408 map
->format
.reg_bytes
+ map
->format
.val_bytes
);
1410 spin_lock_irqsave(&map
->async_lock
, flags
);
1411 list_add_tail(&async
->list
, &map
->async_list
);
1412 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1414 if (val
!= work_val
)
1415 ret
= map
->bus
->async_write(map
->bus_context
,
1417 map
->format
.reg_bytes
+
1418 map
->format
.pad_bytes
,
1419 val
, val_len
, async
);
1421 ret
= map
->bus
->async_write(map
->bus_context
,
1423 map
->format
.reg_bytes
+
1424 map
->format
.pad_bytes
+
1425 val_len
, NULL
, 0, async
);
1428 dev_err(map
->dev
, "Failed to schedule write: %d\n",
1431 spin_lock_irqsave(&map
->async_lock
, flags
);
1432 list_move(&async
->list
, &map
->async_free
);
1433 spin_unlock_irqrestore(&map
->async_lock
, flags
);
1439 trace_regmap_hw_write_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
1441 /* If we're doing a single register write we can probably just
1442 * send the work_buf directly, otherwise try to do a gather
1445 if (val
== work_val
)
1446 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1447 map
->format
.reg_bytes
+
1448 map
->format
.pad_bytes
+
1450 else if (map
->bus
->gather_write
)
1451 ret
= map
->bus
->gather_write(map
->bus_context
, map
->work_buf
,
1452 map
->format
.reg_bytes
+
1453 map
->format
.pad_bytes
,
1456 /* If that didn't work fall back on linearising by hand. */
1457 if (ret
== -ENOTSUPP
) {
1458 len
= map
->format
.reg_bytes
+ map
->format
.pad_bytes
+ val_len
;
1459 buf
= kzalloc(len
, GFP_KERNEL
);
1463 memcpy(buf
, map
->work_buf
, map
->format
.reg_bytes
);
1464 memcpy(buf
+ map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
1466 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1471 trace_regmap_hw_write_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
1477 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1479 * @map: Map to check.
1481 bool regmap_can_raw_write(struct regmap
*map
)
1483 return map
->bus
&& map
->bus
->write
&& map
->format
.format_val
&&
1484 map
->format
.format_reg
;
1486 EXPORT_SYMBOL_GPL(regmap_can_raw_write
);
1489 * regmap_get_raw_read_max - Get the maximum size we can read
1491 * @map: Map to check.
1493 size_t regmap_get_raw_read_max(struct regmap
*map
)
1495 return map
->max_raw_read
;
1497 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max
);
1500 * regmap_get_raw_write_max - Get the maximum size we can read
1502 * @map: Map to check.
1504 size_t regmap_get_raw_write_max(struct regmap
*map
)
1506 return map
->max_raw_write
;
1508 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max
);
1510 static int _regmap_bus_formatted_write(void *context
, unsigned int reg
,
1514 struct regmap_range_node
*range
;
1515 struct regmap
*map
= context
;
1517 WARN_ON(!map
->bus
|| !map
->format
.format_write
);
1519 range
= _regmap_range_lookup(map
, reg
);
1521 ret
= _regmap_select_page(map
, ®
, range
, 1);
1526 map
->format
.format_write(map
, reg
, val
);
1528 trace_regmap_hw_write_start(map
, reg
, 1);
1530 ret
= map
->bus
->write(map
->bus_context
, map
->work_buf
,
1531 map
->format
.buf_size
);
1533 trace_regmap_hw_write_done(map
, reg
, 1);
1538 static int _regmap_bus_reg_write(void *context
, unsigned int reg
,
1541 struct regmap
*map
= context
;
1543 return map
->bus
->reg_write(map
->bus_context
, reg
, val
);
1546 static int _regmap_bus_raw_write(void *context
, unsigned int reg
,
1549 struct regmap
*map
= context
;
1551 WARN_ON(!map
->bus
|| !map
->format
.format_val
);
1553 map
->format
.format_val(map
->work_buf
+ map
->format
.reg_bytes
1554 + map
->format
.pad_bytes
, val
, 0);
1555 return _regmap_raw_write(map
, reg
,
1557 map
->format
.reg_bytes
+
1558 map
->format
.pad_bytes
,
1559 map
->format
.val_bytes
);
1562 static inline void *_regmap_map_get_context(struct regmap
*map
)
1564 return (map
->bus
) ? map
: map
->bus_context
;
1567 int _regmap_write(struct regmap
*map
, unsigned int reg
,
1571 void *context
= _regmap_map_get_context(map
);
1573 if (!regmap_writeable(map
, reg
))
1576 if (!map
->cache_bypass
&& !map
->defer_caching
) {
1577 ret
= regcache_write(map
, reg
, val
);
1580 if (map
->cache_only
) {
1581 map
->cache_dirty
= true;
1587 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
1588 dev_info(map
->dev
, "%x <= %x\n", reg
, val
);
1591 trace_regmap_reg_write(map
, reg
, val
);
1593 return map
->reg_write(context
, reg
, val
);
1597 * regmap_write(): Write a value to a single register
1599 * @map: Register map to write to
1600 * @reg: Register to write to
1601 * @val: Value to be written
1603 * A value of zero will be returned on success, a negative errno will
1604 * be returned in error cases.
1606 int regmap_write(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1610 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1613 map
->lock(map
->lock_arg
);
1615 ret
= _regmap_write(map
, reg
, val
);
1617 map
->unlock(map
->lock_arg
);
1621 EXPORT_SYMBOL_GPL(regmap_write
);
1624 * regmap_write_async(): Write a value to a single register asynchronously
1626 * @map: Register map to write to
1627 * @reg: Register to write to
1628 * @val: Value to be written
1630 * A value of zero will be returned on success, a negative errno will
1631 * be returned in error cases.
1633 int regmap_write_async(struct regmap
*map
, unsigned int reg
, unsigned int val
)
1637 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1640 map
->lock(map
->lock_arg
);
1644 ret
= _regmap_write(map
, reg
, val
);
1648 map
->unlock(map
->lock_arg
);
1652 EXPORT_SYMBOL_GPL(regmap_write_async
);
1655 * regmap_raw_write(): Write raw values to one or more registers
1657 * @map: Register map to write to
1658 * @reg: Initial register to write to
1659 * @val: Block of data to be written, laid out for direct transmission to the
1661 * @val_len: Length of data pointed to by val.
1663 * This function is intended to be used for things like firmware
1664 * download where a large block of data needs to be transferred to the
1665 * device. No formatting will be done on the data provided.
1667 * A value of zero will be returned on success, a negative errno will
1668 * be returned in error cases.
1670 int regmap_raw_write(struct regmap
*map
, unsigned int reg
,
1671 const void *val
, size_t val_len
)
1675 if (!regmap_can_raw_write(map
))
1677 if (val_len
% map
->format
.val_bytes
)
1679 if (map
->max_raw_write
&& map
->max_raw_write
> val_len
)
1682 map
->lock(map
->lock_arg
);
1684 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
1686 map
->unlock(map
->lock_arg
);
1690 EXPORT_SYMBOL_GPL(regmap_raw_write
);
1693 * regmap_field_update_bits_base():
1694 * Perform a read/modify/write cycle on the register field
1695 * with change, async, force option
1697 * @field: Register field to write to
1698 * @mask: Bitmask to change
1699 * @val: Value to be written
1700 * @change: Boolean indicating if a write was done
1701 * @async: Boolean indicating asynchronously
1702 * @force: Boolean indicating use force update
1704 * A value of zero will be returned on success, a negative errno will
1705 * be returned in error cases.
1707 int regmap_field_update_bits_base(struct regmap_field
*field
,
1708 unsigned int mask
, unsigned int val
,
1709 bool *change
, bool async
, bool force
)
1711 mask
= (mask
<< field
->shift
) & field
->mask
;
1713 return regmap_update_bits_base(field
->regmap
, field
->reg
,
1714 mask
, val
<< field
->shift
,
1715 change
, async
, force
);
1717 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base
);
1720 * regmap_field_write(): Write a value to a single register field
1722 * @field: Register field to write to
1723 * @val: Value to be written
1725 * A value of zero will be returned on success, a negative errno will
1726 * be returned in error cases.
1728 int regmap_field_write(struct regmap_field
*field
, unsigned int val
)
1730 return regmap_update_bits(field
->regmap
, field
->reg
,
1731 field
->mask
, val
<< field
->shift
);
1733 EXPORT_SYMBOL_GPL(regmap_field_write
);
1736 * regmap_field_update_bits(): Perform a read/modify/write cycle
1737 * on the register field
1739 * @field: Register field to write to
1740 * @mask: Bitmask to change
1741 * @val: Value to be written
1743 * A value of zero will be returned on success, a negative errno will
1744 * be returned in error cases.
1746 int regmap_field_update_bits(struct regmap_field
*field
, unsigned int mask
, unsigned int val
)
1748 mask
= (mask
<< field
->shift
) & field
->mask
;
1750 return regmap_update_bits(field
->regmap
, field
->reg
,
1751 mask
, val
<< field
->shift
);
1753 EXPORT_SYMBOL_GPL(regmap_field_update_bits
);
1756 * regmap_fields_write(): Write a value to a single register field with port ID
1758 * @field: Register field to write to
1760 * @val: Value to be written
1762 * A value of zero will be returned on success, a negative errno will
1763 * be returned in error cases.
1765 int regmap_fields_write(struct regmap_field
*field
, unsigned int id
,
1768 if (id
>= field
->id_size
)
1771 return regmap_update_bits(field
->regmap
,
1772 field
->reg
+ (field
->id_offset
* id
),
1773 field
->mask
, val
<< field
->shift
);
1775 EXPORT_SYMBOL_GPL(regmap_fields_write
);
1777 int regmap_fields_force_write(struct regmap_field
*field
, unsigned int id
,
1780 if (id
>= field
->id_size
)
1783 return regmap_write_bits(field
->regmap
,
1784 field
->reg
+ (field
->id_offset
* id
),
1785 field
->mask
, val
<< field
->shift
);
1787 EXPORT_SYMBOL_GPL(regmap_fields_force_write
);
1790 * regmap_fields_update_bits(): Perform a read/modify/write cycle
1791 * on the register field
1793 * @field: Register field to write to
1795 * @mask: Bitmask to change
1796 * @val: Value to be written
1798 * A value of zero will be returned on success, a negative errno will
1799 * be returned in error cases.
1801 int regmap_fields_update_bits(struct regmap_field
*field
, unsigned int id
,
1802 unsigned int mask
, unsigned int val
)
1804 if (id
>= field
->id_size
)
1807 mask
= (mask
<< field
->shift
) & field
->mask
;
1809 return regmap_update_bits(field
->regmap
,
1810 field
->reg
+ (field
->id_offset
* id
),
1811 mask
, val
<< field
->shift
);
1813 EXPORT_SYMBOL_GPL(regmap_fields_update_bits
);
1816 * regmap_bulk_write(): Write multiple registers to the device
1818 * @map: Register map to write to
1819 * @reg: First register to be write from
1820 * @val: Block of data to be written, in native register size for device
1821 * @val_count: Number of registers to write
1823 * This function is intended to be used for writing a large block of
1824 * data to the device either in single transfer or multiple transfer.
1826 * A value of zero will be returned on success, a negative errno will
1827 * be returned in error cases.
1829 int regmap_bulk_write(struct regmap
*map
, unsigned int reg
, const void *val
,
1833 size_t val_bytes
= map
->format
.val_bytes
;
1834 size_t total_size
= val_bytes
* val_count
;
1836 if (map
->bus
&& !map
->format
.parse_inplace
)
1838 if (!IS_ALIGNED(reg
, map
->reg_stride
))
1842 * Some devices don't support bulk write, for
1843 * them we have a series of single write operations in the first two if
1846 * The first if block is used for memory mapped io. It does not allow
1847 * val_bytes of 3 for example.
1848 * The second one is used for busses which do not have this limitation
1849 * and can write arbitrary value lengths.
1852 map
->lock(map
->lock_arg
);
1853 for (i
= 0; i
< val_count
; i
++) {
1856 switch (val_bytes
) {
1858 ival
= *(u8
*)(val
+ (i
* val_bytes
));
1861 ival
= *(u16
*)(val
+ (i
* val_bytes
));
1864 ival
= *(u32
*)(val
+ (i
* val_bytes
));
1868 ival
= *(u64
*)(val
+ (i
* val_bytes
));
1876 ret
= _regmap_write(map
, reg
+ (i
* map
->reg_stride
),
1882 map
->unlock(map
->lock_arg
);
1883 } else if (map
->use_single_write
||
1884 (map
->max_raw_write
&& map
->max_raw_write
< total_size
)) {
1885 int chunk_stride
= map
->reg_stride
;
1886 size_t chunk_size
= val_bytes
;
1887 size_t chunk_count
= val_count
;
1889 if (!map
->use_single_write
) {
1890 chunk_size
= map
->max_raw_write
;
1891 if (chunk_size
% val_bytes
)
1892 chunk_size
-= chunk_size
% val_bytes
;
1893 chunk_count
= total_size
/ chunk_size
;
1894 chunk_stride
*= chunk_size
/ val_bytes
;
1897 map
->lock(map
->lock_arg
);
1898 /* Write as many bytes as possible with chunk_size */
1899 for (i
= 0; i
< chunk_count
; i
++) {
1900 ret
= _regmap_raw_write(map
,
1901 reg
+ (i
* chunk_stride
),
1902 val
+ (i
* chunk_size
),
1908 /* Write remaining bytes */
1909 if (!ret
&& chunk_size
* i
< total_size
) {
1910 ret
= _regmap_raw_write(map
, reg
+ (i
* chunk_stride
),
1911 val
+ (i
* chunk_size
),
1912 total_size
- i
* chunk_size
);
1914 map
->unlock(map
->lock_arg
);
1921 wval
= kmemdup(val
, val_count
* val_bytes
, map
->alloc_flags
);
1923 dev_err(map
->dev
, "Error in memory allocation\n");
1926 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
1927 map
->format
.parse_inplace(wval
+ i
);
1929 map
->lock(map
->lock_arg
);
1930 ret
= _regmap_raw_write(map
, reg
, wval
, val_bytes
* val_count
);
1931 map
->unlock(map
->lock_arg
);
1937 EXPORT_SYMBOL_GPL(regmap_bulk_write
);
1940 * _regmap_raw_multi_reg_write()
1942 * the (register,newvalue) pairs in regs have not been formatted, but
1943 * they are all in the same page and have been changed to being page
1944 * relative. The page register has been written if that was necessary.
1946 static int _regmap_raw_multi_reg_write(struct regmap
*map
,
1947 const struct reg_sequence
*regs
,
1954 size_t val_bytes
= map
->format
.val_bytes
;
1955 size_t reg_bytes
= map
->format
.reg_bytes
;
1956 size_t pad_bytes
= map
->format
.pad_bytes
;
1957 size_t pair_size
= reg_bytes
+ pad_bytes
+ val_bytes
;
1958 size_t len
= pair_size
* num_regs
;
1963 buf
= kzalloc(len
, GFP_KERNEL
);
1967 /* We have to linearise by hand. */
1971 for (i
= 0; i
< num_regs
; i
++) {
1972 unsigned int reg
= regs
[i
].reg
;
1973 unsigned int val
= regs
[i
].def
;
1974 trace_regmap_hw_write_start(map
, reg
, 1);
1975 map
->format
.format_reg(u8
, reg
, map
->reg_shift
);
1976 u8
+= reg_bytes
+ pad_bytes
;
1977 map
->format
.format_val(u8
, val
, 0);
1981 *u8
|= map
->write_flag_mask
;
1983 ret
= map
->bus
->write(map
->bus_context
, buf
, len
);
1987 for (i
= 0; i
< num_regs
; i
++) {
1988 int reg
= regs
[i
].reg
;
1989 trace_regmap_hw_write_done(map
, reg
, 1);
1994 static unsigned int _regmap_register_page(struct regmap
*map
,
1996 struct regmap_range_node
*range
)
1998 unsigned int win_page
= (reg
- range
->range_min
) / range
->window_len
;
2003 static int _regmap_range_multi_paged_reg_write(struct regmap
*map
,
2004 struct reg_sequence
*regs
,
2009 struct reg_sequence
*base
;
2010 unsigned int this_page
= 0;
2011 unsigned int page_change
= 0;
2013 * the set of registers are not neccessarily in order, but
2014 * since the order of write must be preserved this algorithm
2015 * chops the set each time the page changes. This also applies
2016 * if there is a delay required at any point in the sequence.
2019 for (i
= 0, n
= 0; i
< num_regs
; i
++, n
++) {
2020 unsigned int reg
= regs
[i
].reg
;
2021 struct regmap_range_node
*range
;
2023 range
= _regmap_range_lookup(map
, reg
);
2025 unsigned int win_page
= _regmap_register_page(map
, reg
,
2029 this_page
= win_page
;
2030 if (win_page
!= this_page
) {
2031 this_page
= win_page
;
2036 /* If we have both a page change and a delay make sure to
2037 * write the regs and apply the delay before we change the
2041 if (page_change
|| regs
[i
].delay_us
) {
2043 /* For situations where the first write requires
2044 * a delay we need to make sure we don't call
2045 * raw_multi_reg_write with n=0
2046 * This can't occur with page breaks as we
2047 * never write on the first iteration
2049 if (regs
[i
].delay_us
&& i
== 0)
2052 ret
= _regmap_raw_multi_reg_write(map
, base
, n
);
2056 if (regs
[i
].delay_us
)
2057 udelay(regs
[i
].delay_us
);
2063 ret
= _regmap_select_page(map
,
2076 return _regmap_raw_multi_reg_write(map
, base
, n
);
2080 static int _regmap_multi_reg_write(struct regmap
*map
,
2081 const struct reg_sequence
*regs
,
2087 if (!map
->can_multi_write
) {
2088 for (i
= 0; i
< num_regs
; i
++) {
2089 ret
= _regmap_write(map
, regs
[i
].reg
, regs
[i
].def
);
2093 if (regs
[i
].delay_us
)
2094 udelay(regs
[i
].delay_us
);
2099 if (!map
->format
.parse_inplace
)
2102 if (map
->writeable_reg
)
2103 for (i
= 0; i
< num_regs
; i
++) {
2104 int reg
= regs
[i
].reg
;
2105 if (!map
->writeable_reg(map
->dev
, reg
))
2107 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2111 if (!map
->cache_bypass
) {
2112 for (i
= 0; i
< num_regs
; i
++) {
2113 unsigned int val
= regs
[i
].def
;
2114 unsigned int reg
= regs
[i
].reg
;
2115 ret
= regcache_write(map
, reg
, val
);
2118 "Error in caching of register: %x ret: %d\n",
2123 if (map
->cache_only
) {
2124 map
->cache_dirty
= true;
2131 for (i
= 0; i
< num_regs
; i
++) {
2132 unsigned int reg
= regs
[i
].reg
;
2133 struct regmap_range_node
*range
;
2135 /* Coalesce all the writes between a page break or a delay
2138 range
= _regmap_range_lookup(map
, reg
);
2139 if (range
|| regs
[i
].delay_us
) {
2140 size_t len
= sizeof(struct reg_sequence
)*num_regs
;
2141 struct reg_sequence
*base
= kmemdup(regs
, len
,
2145 ret
= _regmap_range_multi_paged_reg_write(map
, base
,
2152 return _regmap_raw_multi_reg_write(map
, regs
, num_regs
);
2156 * regmap_multi_reg_write(): Write multiple registers to the device
2158 * where the set of register,value pairs are supplied in any order,
2159 * possibly not all in a single range.
2161 * @map: Register map to write to
2162 * @regs: Array of structures containing register,value to be written
2163 * @num_regs: Number of registers to write
2165 * The 'normal' block write mode will send ultimately send data on the
2166 * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
2167 * addressed. However, this alternative block multi write mode will send
2168 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2169 * must of course support the mode.
2171 * A value of zero will be returned on success, a negative errno will be
2172 * returned in error cases.
2174 int regmap_multi_reg_write(struct regmap
*map
, const struct reg_sequence
*regs
,
2179 map
->lock(map
->lock_arg
);
2181 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2183 map
->unlock(map
->lock_arg
);
2187 EXPORT_SYMBOL_GPL(regmap_multi_reg_write
);
2190 * regmap_multi_reg_write_bypassed(): Write multiple registers to the
2191 * device but not the cache
2193 * where the set of register are supplied in any order
2195 * @map: Register map to write to
2196 * @regs: Array of structures containing register,value to be written
2197 * @num_regs: Number of registers to write
2199 * This function is intended to be used for writing a large block of data
2200 * atomically to the device in single transfer for those I2C client devices
2201 * that implement this alternative block write mode.
2203 * A value of zero will be returned on success, a negative errno will
2204 * be returned in error cases.
2206 int regmap_multi_reg_write_bypassed(struct regmap
*map
,
2207 const struct reg_sequence
*regs
,
2213 map
->lock(map
->lock_arg
);
2215 bypass
= map
->cache_bypass
;
2216 map
->cache_bypass
= true;
2218 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2220 map
->cache_bypass
= bypass
;
2222 map
->unlock(map
->lock_arg
);
2226 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed
);
2229 * regmap_raw_write_async(): Write raw values to one or more registers
2232 * @map: Register map to write to
2233 * @reg: Initial register to write to
2234 * @val: Block of data to be written, laid out for direct transmission to the
2235 * device. Must be valid until regmap_async_complete() is called.
2236 * @val_len: Length of data pointed to by val.
2238 * This function is intended to be used for things like firmware
2239 * download where a large block of data needs to be transferred to the
2240 * device. No formatting will be done on the data provided.
2242 * If supported by the underlying bus the write will be scheduled
2243 * asynchronously, helping maximise I/O speed on higher speed buses
2244 * like SPI. regmap_async_complete() can be called to ensure that all
2245 * asynchrnous writes have been completed.
2247 * A value of zero will be returned on success, a negative errno will
2248 * be returned in error cases.
2250 int regmap_raw_write_async(struct regmap
*map
, unsigned int reg
,
2251 const void *val
, size_t val_len
)
2255 if (val_len
% map
->format
.val_bytes
)
2257 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2260 map
->lock(map
->lock_arg
);
2264 ret
= _regmap_raw_write(map
, reg
, val
, val_len
);
2268 map
->unlock(map
->lock_arg
);
2272 EXPORT_SYMBOL_GPL(regmap_raw_write_async
);
2274 static int _regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2275 unsigned int val_len
)
2277 struct regmap_range_node
*range
;
2278 u8
*u8
= map
->work_buf
;
2283 range
= _regmap_range_lookup(map
, reg
);
2285 ret
= _regmap_select_page(map
, ®
, range
,
2286 val_len
/ map
->format
.val_bytes
);
2291 map
->format
.format_reg(map
->work_buf
, reg
, map
->reg_shift
);
2294 * Some buses or devices flag reads by setting the high bits in the
2295 * register address; since it's always the high bits for all
2296 * current formats we can do this here rather than in
2297 * formatting. This may break if we get interesting formats.
2299 u8
[0] |= map
->read_flag_mask
;
2301 trace_regmap_hw_read_start(map
, reg
, val_len
/ map
->format
.val_bytes
);
2303 ret
= map
->bus
->read(map
->bus_context
, map
->work_buf
,
2304 map
->format
.reg_bytes
+ map
->format
.pad_bytes
,
2307 trace_regmap_hw_read_done(map
, reg
, val_len
/ map
->format
.val_bytes
);
2312 static int _regmap_bus_reg_read(void *context
, unsigned int reg
,
2315 struct regmap
*map
= context
;
2317 return map
->bus
->reg_read(map
->bus_context
, reg
, val
);
2320 static int _regmap_bus_read(void *context
, unsigned int reg
,
2324 struct regmap
*map
= context
;
2326 if (!map
->format
.parse_val
)
2329 ret
= _regmap_raw_read(map
, reg
, map
->work_buf
, map
->format
.val_bytes
);
2331 *val
= map
->format
.parse_val(map
->work_buf
);
2336 static int _regmap_read(struct regmap
*map
, unsigned int reg
,
2340 void *context
= _regmap_map_get_context(map
);
2342 if (!map
->cache_bypass
) {
2343 ret
= regcache_read(map
, reg
, val
);
2348 if (map
->cache_only
)
2351 if (!regmap_readable(map
, reg
))
2354 ret
= map
->reg_read(context
, reg
, val
);
2357 if (map
->dev
&& strcmp(dev_name(map
->dev
), LOG_DEVICE
) == 0)
2358 dev_info(map
->dev
, "%x => %x\n", reg
, *val
);
2361 trace_regmap_reg_read(map
, reg
, *val
);
2363 if (!map
->cache_bypass
)
2364 regcache_write(map
, reg
, *val
);
2371 * regmap_read(): Read a value from a single register
2373 * @map: Register map to read from
2374 * @reg: Register to be read from
2375 * @val: Pointer to store read value
2377 * A value of zero will be returned on success, a negative errno will
2378 * be returned in error cases.
2380 int regmap_read(struct regmap
*map
, unsigned int reg
, unsigned int *val
)
2384 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2387 map
->lock(map
->lock_arg
);
2389 ret
= _regmap_read(map
, reg
, val
);
2391 map
->unlock(map
->lock_arg
);
2395 EXPORT_SYMBOL_GPL(regmap_read
);
2398 * regmap_raw_read(): Read raw data from the device
2400 * @map: Register map to read from
2401 * @reg: First register to be read from
2402 * @val: Pointer to store read value
2403 * @val_len: Size of data to read
2405 * A value of zero will be returned on success, a negative errno will
2406 * be returned in error cases.
2408 int regmap_raw_read(struct regmap
*map
, unsigned int reg
, void *val
,
2411 size_t val_bytes
= map
->format
.val_bytes
;
2412 size_t val_count
= val_len
/ val_bytes
;
2418 if (val_len
% map
->format
.val_bytes
)
2420 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2425 map
->lock(map
->lock_arg
);
2427 if (regmap_volatile_range(map
, reg
, val_count
) || map
->cache_bypass
||
2428 map
->cache_type
== REGCACHE_NONE
) {
2429 if (!map
->bus
->read
) {
2433 if (map
->max_raw_read
&& map
->max_raw_read
< val_len
) {
2438 /* Physical block read if there's no cache involved */
2439 ret
= _regmap_raw_read(map
, reg
, val
, val_len
);
2442 /* Otherwise go word by word for the cache; should be low
2443 * cost as we expect to hit the cache.
2445 for (i
= 0; i
< val_count
; i
++) {
2446 ret
= _regmap_read(map
, reg
+ (i
* map
->reg_stride
),
2451 map
->format
.format_val(val
+ (i
* val_bytes
), v
, 0);
2456 map
->unlock(map
->lock_arg
);
2460 EXPORT_SYMBOL_GPL(regmap_raw_read
);
2463 * regmap_field_read(): Read a value to a single register field
2465 * @field: Register field to read from
2466 * @val: Pointer to store read value
2468 * A value of zero will be returned on success, a negative errno will
2469 * be returned in error cases.
2471 int regmap_field_read(struct regmap_field
*field
, unsigned int *val
)
2474 unsigned int reg_val
;
2475 ret
= regmap_read(field
->regmap
, field
->reg
, ®_val
);
2479 reg_val
&= field
->mask
;
2480 reg_val
>>= field
->shift
;
2485 EXPORT_SYMBOL_GPL(regmap_field_read
);
2488 * regmap_fields_read(): Read a value to a single register field with port ID
2490 * @field: Register field to read from
2492 * @val: Pointer to store read value
2494 * A value of zero will be returned on success, a negative errno will
2495 * be returned in error cases.
2497 int regmap_fields_read(struct regmap_field
*field
, unsigned int id
,
2501 unsigned int reg_val
;
2503 if (id
>= field
->id_size
)
2506 ret
= regmap_read(field
->regmap
,
2507 field
->reg
+ (field
->id_offset
* id
),
2512 reg_val
&= field
->mask
;
2513 reg_val
>>= field
->shift
;
2518 EXPORT_SYMBOL_GPL(regmap_fields_read
);
2521 * regmap_bulk_read(): Read multiple registers from the device
2523 * @map: Register map to read from
2524 * @reg: First register to be read from
2525 * @val: Pointer to store read value, in native register size for device
2526 * @val_count: Number of registers to read
2528 * A value of zero will be returned on success, a negative errno will
2529 * be returned in error cases.
2531 int regmap_bulk_read(struct regmap
*map
, unsigned int reg
, void *val
,
2535 size_t val_bytes
= map
->format
.val_bytes
;
2536 bool vol
= regmap_volatile_range(map
, reg
, val_count
);
2538 if (!IS_ALIGNED(reg
, map
->reg_stride
))
2541 if (map
->bus
&& map
->format
.parse_inplace
&& (vol
|| map
->cache_type
== REGCACHE_NONE
)) {
2543 * Some devices does not support bulk read, for
2544 * them we have a series of single read operations.
2546 size_t total_size
= val_bytes
* val_count
;
2548 if (!map
->use_single_read
&&
2549 (!map
->max_raw_read
|| map
->max_raw_read
> total_size
)) {
2550 ret
= regmap_raw_read(map
, reg
, val
,
2551 val_bytes
* val_count
);
2556 * Some devices do not support bulk read or do not
2557 * support large bulk reads, for them we have a series
2558 * of read operations.
2560 int chunk_stride
= map
->reg_stride
;
2561 size_t chunk_size
= val_bytes
;
2562 size_t chunk_count
= val_count
;
2564 if (!map
->use_single_read
) {
2565 chunk_size
= map
->max_raw_read
;
2566 if (chunk_size
% val_bytes
)
2567 chunk_size
-= chunk_size
% val_bytes
;
2568 chunk_count
= total_size
/ chunk_size
;
2569 chunk_stride
*= chunk_size
/ val_bytes
;
2572 /* Read bytes that fit into a multiple of chunk_size */
2573 for (i
= 0; i
< chunk_count
; i
++) {
2574 ret
= regmap_raw_read(map
,
2575 reg
+ (i
* chunk_stride
),
2576 val
+ (i
* chunk_size
),
2582 /* Read remaining bytes */
2583 if (chunk_size
* i
< total_size
) {
2584 ret
= regmap_raw_read(map
,
2585 reg
+ (i
* chunk_stride
),
2586 val
+ (i
* chunk_size
),
2587 total_size
- i
* chunk_size
);
2593 for (i
= 0; i
< val_count
* val_bytes
; i
+= val_bytes
)
2594 map
->format
.parse_inplace(val
+ i
);
2596 for (i
= 0; i
< val_count
; i
++) {
2598 ret
= regmap_read(map
, reg
+ (i
* map
->reg_stride
),
2603 if (map
->format
.format_val
) {
2604 map
->format
.format_val(val
+ (i
* val_bytes
), ival
, 0);
2606 /* Devices providing read and write
2607 * operations can use the bulk I/O
2608 * functions if they define a val_bytes,
2609 * we assume that the values are native
2619 switch (map
->format
.val_bytes
) {
2643 EXPORT_SYMBOL_GPL(regmap_bulk_read
);
2645 static int _regmap_update_bits(struct regmap
*map
, unsigned int reg
,
2646 unsigned int mask
, unsigned int val
,
2647 bool *change
, bool force_write
)
2650 unsigned int tmp
, orig
;
2655 if (regmap_volatile(map
, reg
) && map
->reg_update_bits
) {
2656 ret
= map
->reg_update_bits(map
->bus_context
, reg
, mask
, val
);
2657 if (ret
== 0 && change
)
2660 ret
= _regmap_read(map
, reg
, &orig
);
2667 if (force_write
|| (tmp
!= orig
)) {
2668 ret
= _regmap_write(map
, reg
, tmp
);
2669 if (ret
== 0 && change
)
2678 * regmap_update_bits_base:
2679 * Perform a read/modify/write cycle on the
2680 * register map with change, async, force option
2682 * @map: Register map to update
2683 * @reg: Register to update
2684 * @mask: Bitmask to change
2685 * @val: New value for bitmask
2686 * @change: Boolean indicating if a write was done
2687 * @async: Boolean indicating asynchronously
2688 * @force: Boolean indicating use force update
2690 * if async was true,
2691 * With most buses the read must be done synchronously so this is most
2692 * useful for devices with a cache which do not need to interact with
2693 * the hardware to determine the current register value.
2695 * Returns zero for success, a negative number on error.
2697 int regmap_update_bits_base(struct regmap
*map
, unsigned int reg
,
2698 unsigned int mask
, unsigned int val
,
2699 bool *change
, bool async
, bool force
)
2703 map
->lock(map
->lock_arg
);
2707 ret
= _regmap_update_bits(map
, reg
, mask
, val
, change
, force
);
2711 map
->unlock(map
->lock_arg
);
2715 EXPORT_SYMBOL_GPL(regmap_update_bits_base
);
2718 * regmap_write_bits: Perform a read/modify/write cycle on the register map
2720 * @map: Register map to update
2721 * @reg: Register to update
2722 * @mask: Bitmask to change
2723 * @val: New value for bitmask
2725 * Returns zero for success, a negative number on error.
2727 int regmap_write_bits(struct regmap
*map
, unsigned int reg
,
2728 unsigned int mask
, unsigned int val
)
2732 map
->lock(map
->lock_arg
);
2733 ret
= _regmap_update_bits(map
, reg
, mask
, val
, NULL
, true);
2734 map
->unlock(map
->lock_arg
);
2738 EXPORT_SYMBOL_GPL(regmap_write_bits
);
2740 void regmap_async_complete_cb(struct regmap_async
*async
, int ret
)
2742 struct regmap
*map
= async
->map
;
2745 trace_regmap_async_io_complete(map
);
2747 spin_lock(&map
->async_lock
);
2748 list_move(&async
->list
, &map
->async_free
);
2749 wake
= list_empty(&map
->async_list
);
2752 map
->async_ret
= ret
;
2754 spin_unlock(&map
->async_lock
);
2757 wake_up(&map
->async_waitq
);
2759 EXPORT_SYMBOL_GPL(regmap_async_complete_cb
);
2761 static int regmap_async_is_done(struct regmap
*map
)
2763 unsigned long flags
;
2766 spin_lock_irqsave(&map
->async_lock
, flags
);
2767 ret
= list_empty(&map
->async_list
);
2768 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2774 * regmap_async_complete: Ensure all asynchronous I/O has completed.
2776 * @map: Map to operate on.
2778 * Blocks until any pending asynchronous I/O has completed. Returns
2779 * an error code for any failed I/O operations.
2781 int regmap_async_complete(struct regmap
*map
)
2783 unsigned long flags
;
2786 /* Nothing to do with no async support */
2787 if (!map
->bus
|| !map
->bus
->async_write
)
2790 trace_regmap_async_complete_start(map
);
2792 wait_event(map
->async_waitq
, regmap_async_is_done(map
));
2794 spin_lock_irqsave(&map
->async_lock
, flags
);
2795 ret
= map
->async_ret
;
2797 spin_unlock_irqrestore(&map
->async_lock
, flags
);
2799 trace_regmap_async_complete_done(map
);
2803 EXPORT_SYMBOL_GPL(regmap_async_complete
);
2806 * regmap_register_patch: Register and apply register updates to be applied
2807 * on device initialistion
2809 * @map: Register map to apply updates to.
2810 * @regs: Values to update.
2811 * @num_regs: Number of entries in regs.
2813 * Register a set of register updates to be applied to the device
2814 * whenever the device registers are synchronised with the cache and
2815 * apply them immediately. Typically this is used to apply
2816 * corrections to be applied to the device defaults on startup, such
2817 * as the updates some vendors provide to undocumented registers.
2819 * The caller must ensure that this function cannot be called
2820 * concurrently with either itself or regcache_sync().
2822 int regmap_register_patch(struct regmap
*map
, const struct reg_sequence
*regs
,
2825 struct reg_sequence
*p
;
2829 if (WARN_ONCE(num_regs
<= 0, "invalid registers number (%d)\n",
2833 p
= krealloc(map
->patch
,
2834 sizeof(struct reg_sequence
) * (map
->patch_regs
+ num_regs
),
2837 memcpy(p
+ map
->patch_regs
, regs
, num_regs
* sizeof(*regs
));
2839 map
->patch_regs
+= num_regs
;
2844 map
->lock(map
->lock_arg
);
2846 bypass
= map
->cache_bypass
;
2848 map
->cache_bypass
= true;
2851 ret
= _regmap_multi_reg_write(map
, regs
, num_regs
);
2854 map
->cache_bypass
= bypass
;
2856 map
->unlock(map
->lock_arg
);
2858 regmap_async_complete(map
);
2862 EXPORT_SYMBOL_GPL(regmap_register_patch
);
2865 * regmap_get_val_bytes(): Report the size of a register value
2867 * Report the size of a register value, mainly intended to for use by
2868 * generic infrastructure built on top of regmap.
2870 int regmap_get_val_bytes(struct regmap
*map
)
2872 if (map
->format
.format_write
)
2875 return map
->format
.val_bytes
;
2877 EXPORT_SYMBOL_GPL(regmap_get_val_bytes
);
2880 * regmap_get_max_register(): Report the max register value
2882 * Report the max register value, mainly intended to for use by
2883 * generic infrastructure built on top of regmap.
2885 int regmap_get_max_register(struct regmap
*map
)
2887 return map
->max_register
? map
->max_register
: -EINVAL
;
2889 EXPORT_SYMBOL_GPL(regmap_get_max_register
);
2892 * regmap_get_reg_stride(): Report the register address stride
2894 * Report the register address stride, mainly intended to for use by
2895 * generic infrastructure built on top of regmap.
2897 int regmap_get_reg_stride(struct regmap
*map
)
2899 return map
->reg_stride
;
2901 EXPORT_SYMBOL_GPL(regmap_get_reg_stride
);
2903 int regmap_parse_val(struct regmap
*map
, const void *buf
,
2906 if (!map
->format
.parse_val
)
2909 *val
= map
->format
.parse_val(buf
);
2913 EXPORT_SYMBOL_GPL(regmap_parse_val
);
2915 static int __init
regmap_initcall(void)
2917 regmap_debugfs_initcall();
2921 postcore_initcall(regmap_initcall
);