1 // SPDX-License-Identifier: GPL-2.0
3 // Register map access API
5 // Copyright 2011 Wolfson Microelectronics plc
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
9 #include <linux/device.h>
10 #include <linux/slab.h>
11 #include <linux/export.h>
12 #include <linux/mutex.h>
13 #include <linux/err.h>
15 #include <linux/rbtree.h>
16 #include <linux/sched.h>
17 #include <linux/delay.h>
18 #include <linux/log2.h>
19 #include <linux/hwspinlock.h>
20 #include <asm/unaligned.h>
22 #define CREATE_TRACE_POINTS
28 * Sometimes for failures during very early init the trace
29 * infrastructure isn't available early enough to be used. For this
30 * sort of problem defining LOG_DEVICE will add printks for basic
31 * register I/O on a specific device.
36 static inline bool regmap_should_log(struct regmap *map)
38 return (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0);
41 static inline bool regmap_should_log(struct regmap *map) { return false; }
45 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
46 unsigned int mask, unsigned int val,
47 bool *change, bool force_write);
49 static int _regmap_bus_reg_read(void *context, unsigned int reg,
51 static int _regmap_bus_read(void *context, unsigned int reg,
53 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
55 static int _regmap_bus_reg_write(void *context, unsigned int reg,
57 static int _regmap_bus_raw_write(void *context, unsigned int reg,
60 bool regmap_reg_in_ranges(unsigned int reg,
61 const struct regmap_range *ranges,
64 const struct regmap_range *r;
67 for (i = 0, r = ranges; i < nranges; i++, r++)
68 if (regmap_reg_in_range(reg, r))
72 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
74 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
75 const struct regmap_access_table *table)
77 /* Check "no ranges" first */
78 if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
81 /* In case zero "yes ranges" are supplied, any reg is OK */
82 if (!table->n_yes_ranges)
85 return regmap_reg_in_ranges(reg, table->yes_ranges,
88 EXPORT_SYMBOL_GPL(regmap_check_range_table);
90 bool regmap_writeable(struct regmap *map, unsigned int reg)
92 if (map->max_register && reg > map->max_register)
95 if (map->writeable_reg)
96 return map->writeable_reg(map->dev, reg);
99 return regmap_check_range_table(map, reg, map->wr_table);
104 bool regmap_cached(struct regmap *map, unsigned int reg)
109 if (map->cache_type == REGCACHE_NONE)
115 if (map->max_register && reg > map->max_register)
118 map->lock(map->lock_arg);
119 ret = regcache_read(map, reg, &val);
120 map->unlock(map->lock_arg);
127 bool regmap_readable(struct regmap *map, unsigned int reg)
132 if (map->max_register && reg > map->max_register)
135 if (map->format.format_write)
138 if (map->readable_reg)
139 return map->readable_reg(map->dev, reg);
142 return regmap_check_range_table(map, reg, map->rd_table);
147 bool regmap_volatile(struct regmap *map, unsigned int reg)
149 if (!map->format.format_write && !regmap_readable(map, reg))
152 if (map->volatile_reg)
153 return map->volatile_reg(map->dev, reg);
155 if (map->volatile_table)
156 return regmap_check_range_table(map, reg, map->volatile_table);
164 bool regmap_precious(struct regmap *map, unsigned int reg)
166 if (!regmap_readable(map, reg))
169 if (map->precious_reg)
170 return map->precious_reg(map->dev, reg);
172 if (map->precious_table)
173 return regmap_check_range_table(map, reg, map->precious_table);
178 bool regmap_writeable_noinc(struct regmap *map, unsigned int reg)
180 if (map->writeable_noinc_reg)
181 return map->writeable_noinc_reg(map->dev, reg);
183 if (map->wr_noinc_table)
184 return regmap_check_range_table(map, reg, map->wr_noinc_table);
189 bool regmap_readable_noinc(struct regmap *map, unsigned int reg)
191 if (map->readable_noinc_reg)
192 return map->readable_noinc_reg(map->dev, reg);
194 if (map->rd_noinc_table)
195 return regmap_check_range_table(map, reg, map->rd_noinc_table);
200 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
205 for (i = 0; i < num; i++)
206 if (!regmap_volatile(map, reg + regmap_get_offset(map, i)))
212 static void regmap_format_2_6_write(struct regmap *map,
213 unsigned int reg, unsigned int val)
215 u8 *out = map->work_buf;
217 *out = (reg << 6) | val;
220 static void regmap_format_4_12_write(struct regmap *map,
221 unsigned int reg, unsigned int val)
223 __be16 *out = map->work_buf;
224 *out = cpu_to_be16((reg << 12) | val);
227 static void regmap_format_7_9_write(struct regmap *map,
228 unsigned int reg, unsigned int val)
230 __be16 *out = map->work_buf;
231 *out = cpu_to_be16((reg << 9) | val);
234 static void regmap_format_10_14_write(struct regmap *map,
235 unsigned int reg, unsigned int val)
237 u8 *out = map->work_buf;
240 out[1] = (val >> 8) | (reg << 6);
244 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
251 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
253 put_unaligned_be16(val << shift, buf);
256 static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
258 put_unaligned_le16(val << shift, buf);
261 static void regmap_format_16_native(void *buf, unsigned int val,
264 u16 v = val << shift;
266 memcpy(buf, &v, sizeof(v));
269 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
280 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
282 put_unaligned_be32(val << shift, buf);
285 static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
287 put_unaligned_le32(val << shift, buf);
290 static void regmap_format_32_native(void *buf, unsigned int val,
293 u32 v = val << shift;
295 memcpy(buf, &v, sizeof(v));
299 static void regmap_format_64_be(void *buf, unsigned int val, unsigned int shift)
301 put_unaligned_be64((u64) val << shift, buf);
304 static void regmap_format_64_le(void *buf, unsigned int val, unsigned int shift)
306 put_unaligned_le64((u64) val << shift, buf);
309 static void regmap_format_64_native(void *buf, unsigned int val,
312 u64 v = (u64) val << shift;
314 memcpy(buf, &v, sizeof(v));
318 static void regmap_parse_inplace_noop(void *buf)
322 static unsigned int regmap_parse_8(const void *buf)
329 static unsigned int regmap_parse_16_be(const void *buf)
331 return get_unaligned_be16(buf);
334 static unsigned int regmap_parse_16_le(const void *buf)
336 return get_unaligned_le16(buf);
339 static void regmap_parse_16_be_inplace(void *buf)
341 u16 v = get_unaligned_be16(buf);
343 memcpy(buf, &v, sizeof(v));
346 static void regmap_parse_16_le_inplace(void *buf)
348 u16 v = get_unaligned_le16(buf);
350 memcpy(buf, &v, sizeof(v));
353 static unsigned int regmap_parse_16_native(const void *buf)
357 memcpy(&v, buf, sizeof(v));
361 static unsigned int regmap_parse_24(const void *buf)
364 unsigned int ret = b[2];
365 ret |= ((unsigned int)b[1]) << 8;
366 ret |= ((unsigned int)b[0]) << 16;
371 static unsigned int regmap_parse_32_be(const void *buf)
373 return get_unaligned_be32(buf);
376 static unsigned int regmap_parse_32_le(const void *buf)
378 return get_unaligned_le32(buf);
381 static void regmap_parse_32_be_inplace(void *buf)
383 u32 v = get_unaligned_be32(buf);
385 memcpy(buf, &v, sizeof(v));
388 static void regmap_parse_32_le_inplace(void *buf)
390 u32 v = get_unaligned_le32(buf);
392 memcpy(buf, &v, sizeof(v));
395 static unsigned int regmap_parse_32_native(const void *buf)
399 memcpy(&v, buf, sizeof(v));
404 static unsigned int regmap_parse_64_be(const void *buf)
406 return get_unaligned_be64(buf);
409 static unsigned int regmap_parse_64_le(const void *buf)
411 return get_unaligned_le64(buf);
414 static void regmap_parse_64_be_inplace(void *buf)
416 u64 v = get_unaligned_be64(buf);
418 memcpy(buf, &v, sizeof(v));
421 static void regmap_parse_64_le_inplace(void *buf)
423 u64 v = get_unaligned_le64(buf);
425 memcpy(buf, &v, sizeof(v));
428 static unsigned int regmap_parse_64_native(const void *buf)
432 memcpy(&v, buf, sizeof(v));
437 static void regmap_lock_hwlock(void *__map)
439 struct regmap *map = __map;
441 hwspin_lock_timeout(map->hwlock, UINT_MAX);
444 static void regmap_lock_hwlock_irq(void *__map)
446 struct regmap *map = __map;
448 hwspin_lock_timeout_irq(map->hwlock, UINT_MAX);
451 static void regmap_lock_hwlock_irqsave(void *__map)
453 struct regmap *map = __map;
455 hwspin_lock_timeout_irqsave(map->hwlock, UINT_MAX,
456 &map->spinlock_flags);
459 static void regmap_unlock_hwlock(void *__map)
461 struct regmap *map = __map;
463 hwspin_unlock(map->hwlock);
466 static void regmap_unlock_hwlock_irq(void *__map)
468 struct regmap *map = __map;
470 hwspin_unlock_irq(map->hwlock);
473 static void regmap_unlock_hwlock_irqrestore(void *__map)
475 struct regmap *map = __map;
477 hwspin_unlock_irqrestore(map->hwlock, &map->spinlock_flags);
480 static void regmap_lock_unlock_none(void *__map)
485 static void regmap_lock_mutex(void *__map)
487 struct regmap *map = __map;
488 mutex_lock(&map->mutex);
491 static void regmap_unlock_mutex(void *__map)
493 struct regmap *map = __map;
494 mutex_unlock(&map->mutex);
497 static void regmap_lock_spinlock(void *__map)
498 __acquires(&map->spinlock)
500 struct regmap *map = __map;
503 spin_lock_irqsave(&map->spinlock, flags);
504 map->spinlock_flags = flags;
507 static void regmap_unlock_spinlock(void *__map)
508 __releases(&map->spinlock)
510 struct regmap *map = __map;
511 spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
514 static void dev_get_regmap_release(struct device *dev, void *res)
517 * We don't actually have anything to do here; the goal here
518 * is not to manage the regmap but to provide a simple way to
519 * get the regmap back given a struct device.
523 static bool _regmap_range_add(struct regmap *map,
524 struct regmap_range_node *data)
526 struct rb_root *root = &map->range_tree;
527 struct rb_node **new = &(root->rb_node), *parent = NULL;
530 struct regmap_range_node *this =
531 rb_entry(*new, struct regmap_range_node, node);
534 if (data->range_max < this->range_min)
535 new = &((*new)->rb_left);
536 else if (data->range_min > this->range_max)
537 new = &((*new)->rb_right);
542 rb_link_node(&data->node, parent, new);
543 rb_insert_color(&data->node, root);
548 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
551 struct rb_node *node = map->range_tree.rb_node;
554 struct regmap_range_node *this =
555 rb_entry(node, struct regmap_range_node, node);
557 if (reg < this->range_min)
558 node = node->rb_left;
559 else if (reg > this->range_max)
560 node = node->rb_right;
568 static void regmap_range_exit(struct regmap *map)
570 struct rb_node *next;
571 struct regmap_range_node *range_node;
573 next = rb_first(&map->range_tree);
575 range_node = rb_entry(next, struct regmap_range_node, node);
576 next = rb_next(&range_node->node);
577 rb_erase(&range_node->node, &map->range_tree);
581 kfree(map->selector_work_buf);
584 int regmap_attach_dev(struct device *dev, struct regmap *map,
585 const struct regmap_config *config)
591 regmap_debugfs_init(map, config->name);
593 /* Add a devres resource for dev_get_regmap() */
594 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
596 regmap_debugfs_exit(map);
604 EXPORT_SYMBOL_GPL(regmap_attach_dev);
606 static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
607 const struct regmap_config *config)
609 enum regmap_endian endian;
611 /* Retrieve the endianness specification from the regmap config */
612 endian = config->reg_format_endian;
614 /* If the regmap config specified a non-default value, use that */
615 if (endian != REGMAP_ENDIAN_DEFAULT)
618 /* Retrieve the endianness specification from the bus config */
619 if (bus && bus->reg_format_endian_default)
620 endian = bus->reg_format_endian_default;
622 /* If the bus specified a non-default value, use that */
623 if (endian != REGMAP_ENDIAN_DEFAULT)
626 /* Use this if no other value was found */
627 return REGMAP_ENDIAN_BIG;
630 enum regmap_endian regmap_get_val_endian(struct device *dev,
631 const struct regmap_bus *bus,
632 const struct regmap_config *config)
634 struct device_node *np;
635 enum regmap_endian endian;
637 /* Retrieve the endianness specification from the regmap config */
638 endian = config->val_format_endian;
640 /* If the regmap config specified a non-default value, use that */
641 if (endian != REGMAP_ENDIAN_DEFAULT)
644 /* If the dev and dev->of_node exist try to get endianness from DT */
645 if (dev && dev->of_node) {
648 /* Parse the device's DT node for an endianness specification */
649 if (of_property_read_bool(np, "big-endian"))
650 endian = REGMAP_ENDIAN_BIG;
651 else if (of_property_read_bool(np, "little-endian"))
652 endian = REGMAP_ENDIAN_LITTLE;
653 else if (of_property_read_bool(np, "native-endian"))
654 endian = REGMAP_ENDIAN_NATIVE;
656 /* If the endianness was specified in DT, use that */
657 if (endian != REGMAP_ENDIAN_DEFAULT)
661 /* Retrieve the endianness specification from the bus config */
662 if (bus && bus->val_format_endian_default)
663 endian = bus->val_format_endian_default;
665 /* If the bus specified a non-default value, use that */
666 if (endian != REGMAP_ENDIAN_DEFAULT)
669 /* Use this if no other value was found */
670 return REGMAP_ENDIAN_BIG;
672 EXPORT_SYMBOL_GPL(regmap_get_val_endian);
674 struct regmap *__regmap_init(struct device *dev,
675 const struct regmap_bus *bus,
677 const struct regmap_config *config,
678 struct lock_class_key *lock_key,
679 const char *lock_name)
683 enum regmap_endian reg_endian, val_endian;
689 map = kzalloc(sizeof(*map), GFP_KERNEL);
696 map->name = kstrdup_const(config->name, GFP_KERNEL);
703 if (config->disable_locking) {
704 map->lock = map->unlock = regmap_lock_unlock_none;
705 regmap_debugfs_disable(map);
706 } else if (config->lock && config->unlock) {
707 map->lock = config->lock;
708 map->unlock = config->unlock;
709 map->lock_arg = config->lock_arg;
710 } else if (config->use_hwlock) {
711 map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
717 switch (config->hwlock_mode) {
718 case HWLOCK_IRQSTATE:
719 map->lock = regmap_lock_hwlock_irqsave;
720 map->unlock = regmap_unlock_hwlock_irqrestore;
723 map->lock = regmap_lock_hwlock_irq;
724 map->unlock = regmap_unlock_hwlock_irq;
727 map->lock = regmap_lock_hwlock;
728 map->unlock = regmap_unlock_hwlock;
734 if ((bus && bus->fast_io) ||
736 spin_lock_init(&map->spinlock);
737 map->lock = regmap_lock_spinlock;
738 map->unlock = regmap_unlock_spinlock;
739 lockdep_set_class_and_name(&map->spinlock,
740 lock_key, lock_name);
742 mutex_init(&map->mutex);
743 map->lock = regmap_lock_mutex;
744 map->unlock = regmap_unlock_mutex;
745 lockdep_set_class_and_name(&map->mutex,
746 lock_key, lock_name);
752 * When we write in fast-paths with regmap_bulk_write() don't allocate
753 * scratch buffers with sleeping allocations.
755 if ((bus && bus->fast_io) || config->fast_io)
756 map->alloc_flags = GFP_ATOMIC;
758 map->alloc_flags = GFP_KERNEL;
760 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
761 map->format.pad_bytes = config->pad_bits / 8;
762 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
763 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
764 config->val_bits + config->pad_bits, 8);
765 map->reg_shift = config->pad_bits % 8;
766 if (config->reg_stride)
767 map->reg_stride = config->reg_stride;
770 if (is_power_of_2(map->reg_stride))
771 map->reg_stride_order = ilog2(map->reg_stride);
773 map->reg_stride_order = -1;
774 map->use_single_read = config->use_single_read || !bus || !bus->read;
775 map->use_single_write = config->use_single_write || !bus || !bus->write;
776 map->can_multi_write = config->can_multi_write && bus && bus->write;
778 map->max_raw_read = bus->max_raw_read;
779 map->max_raw_write = bus->max_raw_write;
783 map->bus_context = bus_context;
784 map->max_register = config->max_register;
785 map->wr_table = config->wr_table;
786 map->rd_table = config->rd_table;
787 map->volatile_table = config->volatile_table;
788 map->precious_table = config->precious_table;
789 map->wr_noinc_table = config->wr_noinc_table;
790 map->rd_noinc_table = config->rd_noinc_table;
791 map->writeable_reg = config->writeable_reg;
792 map->readable_reg = config->readable_reg;
793 map->volatile_reg = config->volatile_reg;
794 map->precious_reg = config->precious_reg;
795 map->writeable_noinc_reg = config->writeable_noinc_reg;
796 map->readable_noinc_reg = config->readable_noinc_reg;
797 map->cache_type = config->cache_type;
799 spin_lock_init(&map->async_lock);
800 INIT_LIST_HEAD(&map->async_list);
801 INIT_LIST_HEAD(&map->async_free);
802 init_waitqueue_head(&map->async_waitq);
804 if (config->read_flag_mask ||
805 config->write_flag_mask ||
806 config->zero_flag_mask) {
807 map->read_flag_mask = config->read_flag_mask;
808 map->write_flag_mask = config->write_flag_mask;
810 map->read_flag_mask = bus->read_flag_mask;
814 map->reg_read = config->reg_read;
815 map->reg_write = config->reg_write;
817 map->defer_caching = false;
818 goto skip_format_initialization;
819 } else if (!bus->read || !bus->write) {
820 map->reg_read = _regmap_bus_reg_read;
821 map->reg_write = _regmap_bus_reg_write;
822 map->reg_update_bits = bus->reg_update_bits;
824 map->defer_caching = false;
825 goto skip_format_initialization;
827 map->reg_read = _regmap_bus_read;
828 map->reg_update_bits = bus->reg_update_bits;
831 reg_endian = regmap_get_reg_endian(bus, config);
832 val_endian = regmap_get_val_endian(dev, bus, config);
834 switch (config->reg_bits + map->reg_shift) {
836 switch (config->val_bits) {
838 map->format.format_write = regmap_format_2_6_write;
846 switch (config->val_bits) {
848 map->format.format_write = regmap_format_4_12_write;
856 switch (config->val_bits) {
858 map->format.format_write = regmap_format_7_9_write;
866 switch (config->val_bits) {
868 map->format.format_write = regmap_format_10_14_write;
876 map->format.format_reg = regmap_format_8;
880 switch (reg_endian) {
881 case REGMAP_ENDIAN_BIG:
882 map->format.format_reg = regmap_format_16_be;
884 case REGMAP_ENDIAN_LITTLE:
885 map->format.format_reg = regmap_format_16_le;
887 case REGMAP_ENDIAN_NATIVE:
888 map->format.format_reg = regmap_format_16_native;
896 if (reg_endian != REGMAP_ENDIAN_BIG)
898 map->format.format_reg = regmap_format_24;
902 switch (reg_endian) {
903 case REGMAP_ENDIAN_BIG:
904 map->format.format_reg = regmap_format_32_be;
906 case REGMAP_ENDIAN_LITTLE:
907 map->format.format_reg = regmap_format_32_le;
909 case REGMAP_ENDIAN_NATIVE:
910 map->format.format_reg = regmap_format_32_native;
919 switch (reg_endian) {
920 case REGMAP_ENDIAN_BIG:
921 map->format.format_reg = regmap_format_64_be;
923 case REGMAP_ENDIAN_LITTLE:
924 map->format.format_reg = regmap_format_64_le;
926 case REGMAP_ENDIAN_NATIVE:
927 map->format.format_reg = regmap_format_64_native;
939 if (val_endian == REGMAP_ENDIAN_NATIVE)
940 map->format.parse_inplace = regmap_parse_inplace_noop;
942 switch (config->val_bits) {
944 map->format.format_val = regmap_format_8;
945 map->format.parse_val = regmap_parse_8;
946 map->format.parse_inplace = regmap_parse_inplace_noop;
949 switch (val_endian) {
950 case REGMAP_ENDIAN_BIG:
951 map->format.format_val = regmap_format_16_be;
952 map->format.parse_val = regmap_parse_16_be;
953 map->format.parse_inplace = regmap_parse_16_be_inplace;
955 case REGMAP_ENDIAN_LITTLE:
956 map->format.format_val = regmap_format_16_le;
957 map->format.parse_val = regmap_parse_16_le;
958 map->format.parse_inplace = regmap_parse_16_le_inplace;
960 case REGMAP_ENDIAN_NATIVE:
961 map->format.format_val = regmap_format_16_native;
962 map->format.parse_val = regmap_parse_16_native;
969 if (val_endian != REGMAP_ENDIAN_BIG)
971 map->format.format_val = regmap_format_24;
972 map->format.parse_val = regmap_parse_24;
975 switch (val_endian) {
976 case REGMAP_ENDIAN_BIG:
977 map->format.format_val = regmap_format_32_be;
978 map->format.parse_val = regmap_parse_32_be;
979 map->format.parse_inplace = regmap_parse_32_be_inplace;
981 case REGMAP_ENDIAN_LITTLE:
982 map->format.format_val = regmap_format_32_le;
983 map->format.parse_val = regmap_parse_32_le;
984 map->format.parse_inplace = regmap_parse_32_le_inplace;
986 case REGMAP_ENDIAN_NATIVE:
987 map->format.format_val = regmap_format_32_native;
988 map->format.parse_val = regmap_parse_32_native;
996 switch (val_endian) {
997 case REGMAP_ENDIAN_BIG:
998 map->format.format_val = regmap_format_64_be;
999 map->format.parse_val = regmap_parse_64_be;
1000 map->format.parse_inplace = regmap_parse_64_be_inplace;
1002 case REGMAP_ENDIAN_LITTLE:
1003 map->format.format_val = regmap_format_64_le;
1004 map->format.parse_val = regmap_parse_64_le;
1005 map->format.parse_inplace = regmap_parse_64_le_inplace;
1007 case REGMAP_ENDIAN_NATIVE:
1008 map->format.format_val = regmap_format_64_native;
1009 map->format.parse_val = regmap_parse_64_native;
1018 if (map->format.format_write) {
1019 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
1020 (val_endian != REGMAP_ENDIAN_BIG))
1022 map->use_single_write = true;
1025 if (!map->format.format_write &&
1026 !(map->format.format_reg && map->format.format_val))
1029 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
1030 if (map->work_buf == NULL) {
1035 if (map->format.format_write) {
1036 map->defer_caching = false;
1037 map->reg_write = _regmap_bus_formatted_write;
1038 } else if (map->format.format_val) {
1039 map->defer_caching = true;
1040 map->reg_write = _regmap_bus_raw_write;
1043 skip_format_initialization:
1045 map->range_tree = RB_ROOT;
1046 for (i = 0; i < config->num_ranges; i++) {
1047 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
1048 struct regmap_range_node *new;
1051 if (range_cfg->range_max < range_cfg->range_min) {
1052 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
1053 range_cfg->range_max, range_cfg->range_min);
1057 if (range_cfg->range_max > map->max_register) {
1058 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
1059 range_cfg->range_max, map->max_register);
1063 if (range_cfg->selector_reg > map->max_register) {
1065 "Invalid range %d: selector out of map\n", i);
1069 if (range_cfg->window_len == 0) {
1070 dev_err(map->dev, "Invalid range %d: window_len 0\n",
1075 /* Make sure, that this register range has no selector
1076 or data window within its boundary */
1077 for (j = 0; j < config->num_ranges; j++) {
1078 unsigned sel_reg = config->ranges[j].selector_reg;
1079 unsigned win_min = config->ranges[j].window_start;
1080 unsigned win_max = win_min +
1081 config->ranges[j].window_len - 1;
1083 /* Allow data window inside its own virtual range */
1087 if (range_cfg->range_min <= sel_reg &&
1088 sel_reg <= range_cfg->range_max) {
1090 "Range %d: selector for %d in window\n",
1095 if (!(win_max < range_cfg->range_min ||
1096 win_min > range_cfg->range_max)) {
1098 "Range %d: window for %d in window\n",
1104 new = kzalloc(sizeof(*new), GFP_KERNEL);
1111 new->name = range_cfg->name;
1112 new->range_min = range_cfg->range_min;
1113 new->range_max = range_cfg->range_max;
1114 new->selector_reg = range_cfg->selector_reg;
1115 new->selector_mask = range_cfg->selector_mask;
1116 new->selector_shift = range_cfg->selector_shift;
1117 new->window_start = range_cfg->window_start;
1118 new->window_len = range_cfg->window_len;
1120 if (!_regmap_range_add(map, new)) {
1121 dev_err(map->dev, "Failed to add range %d\n", i);
1126 if (map->selector_work_buf == NULL) {
1127 map->selector_work_buf =
1128 kzalloc(map->format.buf_size, GFP_KERNEL);
1129 if (map->selector_work_buf == NULL) {
1136 ret = regcache_init(map, config);
1141 ret = regmap_attach_dev(dev, map, config);
1145 regmap_debugfs_init(map, config->name);
1153 regmap_range_exit(map);
1154 kfree(map->work_buf);
1157 hwspin_lock_free(map->hwlock);
1159 kfree_const(map->name);
1163 return ERR_PTR(ret);
1165 EXPORT_SYMBOL_GPL(__regmap_init);
1167 static void devm_regmap_release(struct device *dev, void *res)
1169 regmap_exit(*(struct regmap **)res);
1172 struct regmap *__devm_regmap_init(struct device *dev,
1173 const struct regmap_bus *bus,
1175 const struct regmap_config *config,
1176 struct lock_class_key *lock_key,
1177 const char *lock_name)
1179 struct regmap **ptr, *regmap;
1181 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
1183 return ERR_PTR(-ENOMEM);
1185 regmap = __regmap_init(dev, bus, bus_context, config,
1186 lock_key, lock_name);
1187 if (!IS_ERR(regmap)) {
1189 devres_add(dev, ptr);
1196 EXPORT_SYMBOL_GPL(__devm_regmap_init);
1198 static void regmap_field_init(struct regmap_field *rm_field,
1199 struct regmap *regmap, struct reg_field reg_field)
1201 rm_field->regmap = regmap;
1202 rm_field->reg = reg_field.reg;
1203 rm_field->shift = reg_field.lsb;
1204 rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
1205 rm_field->id_size = reg_field.id_size;
1206 rm_field->id_offset = reg_field.id_offset;
1210 * devm_regmap_field_alloc() - Allocate and initialise a register field.
1212 * @dev: Device that will be interacted with
1213 * @regmap: regmap bank in which this register field is located.
1214 * @reg_field: Register field with in the bank.
1216 * The return value will be an ERR_PTR() on error or a valid pointer
1217 * to a struct regmap_field. The regmap_field will be automatically freed
1218 * by the device management code.
1220 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
1221 struct regmap *regmap, struct reg_field reg_field)
1223 struct regmap_field *rm_field = devm_kzalloc(dev,
1224 sizeof(*rm_field), GFP_KERNEL);
1226 return ERR_PTR(-ENOMEM);
1228 regmap_field_init(rm_field, regmap, reg_field);
1233 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
1236 * devm_regmap_field_free() - Free a register field allocated using
1237 * devm_regmap_field_alloc.
1239 * @dev: Device that will be interacted with
1240 * @field: regmap field which should be freed.
1242 * Free register field allocated using devm_regmap_field_alloc(). Usually
1243 * drivers need not call this function, as the memory allocated via devm
1244 * will be freed as per device-driver life-cyle.
1246 void devm_regmap_field_free(struct device *dev,
1247 struct regmap_field *field)
1249 devm_kfree(dev, field);
1251 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
1254 * regmap_field_alloc() - Allocate and initialise a register field.
1256 * @regmap: regmap bank in which this register field is located.
1257 * @reg_field: Register field with in the bank.
1259 * The return value will be an ERR_PTR() on error or a valid pointer
1260 * to a struct regmap_field. The regmap_field should be freed by the
1261 * user once its finished working with it using regmap_field_free().
1263 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1264 struct reg_field reg_field)
1266 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1269 return ERR_PTR(-ENOMEM);
1271 regmap_field_init(rm_field, regmap, reg_field);
1275 EXPORT_SYMBOL_GPL(regmap_field_alloc);
1278 * regmap_field_free() - Free register field allocated using
1279 * regmap_field_alloc.
1281 * @field: regmap field which should be freed.
1283 void regmap_field_free(struct regmap_field *field)
1287 EXPORT_SYMBOL_GPL(regmap_field_free);
1290 * regmap_reinit_cache() - Reinitialise the current register cache
1292 * @map: Register map to operate on.
1293 * @config: New configuration. Only the cache data will be used.
1295 * Discard any existing register cache for the map and initialize a
1296 * new cache. This can be used to restore the cache to defaults or to
1297 * update the cache configuration to reflect runtime discovery of the
1300 * No explicit locking is done here, the user needs to ensure that
1301 * this function will not race with other calls to regmap.
1303 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1306 regmap_debugfs_exit(map);
1308 map->max_register = config->max_register;
1309 map->writeable_reg = config->writeable_reg;
1310 map->readable_reg = config->readable_reg;
1311 map->volatile_reg = config->volatile_reg;
1312 map->precious_reg = config->precious_reg;
1313 map->writeable_noinc_reg = config->writeable_noinc_reg;
1314 map->readable_noinc_reg = config->readable_noinc_reg;
1315 map->cache_type = config->cache_type;
1317 regmap_debugfs_init(map, config->name);
1319 map->cache_bypass = false;
1320 map->cache_only = false;
1322 return regcache_init(map, config);
1324 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1327 * regmap_exit() - Free a previously allocated register map
1329 * @map: Register map to operate on.
1331 void regmap_exit(struct regmap *map)
1333 struct regmap_async *async;
1336 regmap_debugfs_exit(map);
1337 regmap_range_exit(map);
1338 if (map->bus && map->bus->free_context)
1339 map->bus->free_context(map->bus_context);
1340 kfree(map->work_buf);
1341 while (!list_empty(&map->async_free)) {
1342 async = list_first_entry_or_null(&map->async_free,
1343 struct regmap_async,
1345 list_del(&async->list);
1346 kfree(async->work_buf);
1350 hwspin_lock_free(map->hwlock);
1351 kfree_const(map->name);
1355 EXPORT_SYMBOL_GPL(regmap_exit);
1357 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1359 struct regmap **r = res;
1365 /* If the user didn't specify a name match any */
1367 return (*r)->name == data;
1373 * dev_get_regmap() - Obtain the regmap (if any) for a device
1375 * @dev: Device to retrieve the map for
1376 * @name: Optional name for the register map, usually NULL.
1378 * Returns the regmap for the device if one is present, or NULL. If
1379 * name is specified then it must match the name specified when
1380 * registering the device, if it is NULL then the first regmap found
1381 * will be used. Devices with multiple register maps are very rare,
1382 * generic code should normally not need to specify a name.
1384 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1386 struct regmap **r = devres_find(dev, dev_get_regmap_release,
1387 dev_get_regmap_match, (void *)name);
1393 EXPORT_SYMBOL_GPL(dev_get_regmap);
1396 * regmap_get_device() - Obtain the device from a regmap
1398 * @map: Register map to operate on.
1400 * Returns the underlying device that the regmap has been created for.
1402 struct device *regmap_get_device(struct regmap *map)
1406 EXPORT_SYMBOL_GPL(regmap_get_device);
1408 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1409 struct regmap_range_node *range,
1410 unsigned int val_num)
1412 void *orig_work_buf;
1413 unsigned int win_offset;
1414 unsigned int win_page;
1418 win_offset = (*reg - range->range_min) % range->window_len;
1419 win_page = (*reg - range->range_min) / range->window_len;
1422 /* Bulk write shouldn't cross range boundary */
1423 if (*reg + val_num - 1 > range->range_max)
1426 /* ... or single page boundary */
1427 if (val_num > range->window_len - win_offset)
1431 /* It is possible to have selector register inside data window.
1432 In that case, selector register is located on every page and
1433 it needs no page switching, when accessed alone. */
1435 range->window_start + win_offset != range->selector_reg) {
1436 /* Use separate work_buf during page switching */
1437 orig_work_buf = map->work_buf;
1438 map->work_buf = map->selector_work_buf;
1440 ret = _regmap_update_bits(map, range->selector_reg,
1441 range->selector_mask,
1442 win_page << range->selector_shift,
1445 map->work_buf = orig_work_buf;
1451 *reg = range->window_start + win_offset;
1456 static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes,
1462 if (!mask || !map->work_buf)
1465 buf = map->work_buf;
1467 for (i = 0; i < max_bytes; i++)
1468 buf[i] |= (mask >> (8 * i)) & 0xff;
1471 static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
1472 const void *val, size_t val_len)
1474 struct regmap_range_node *range;
1475 unsigned long flags;
1476 void *work_val = map->work_buf + map->format.reg_bytes +
1477 map->format.pad_bytes;
1479 int ret = -ENOTSUPP;
1485 /* Check for unwritable or noinc registers in range
1488 if (!regmap_writeable_noinc(map, reg)) {
1489 for (i = 0; i < val_len / map->format.val_bytes; i++) {
1490 unsigned int element =
1491 reg + regmap_get_offset(map, i);
1492 if (!regmap_writeable(map, element) ||
1493 regmap_writeable_noinc(map, element))
1498 if (!map->cache_bypass && map->format.parse_val) {
1500 int val_bytes = map->format.val_bytes;
1501 for (i = 0; i < val_len / val_bytes; i++) {
1502 ival = map->format.parse_val(val + (i * val_bytes));
1503 ret = regcache_write(map,
1504 reg + regmap_get_offset(map, i),
1508 "Error in caching of register: %x ret: %d\n",
1513 if (map->cache_only) {
1514 map->cache_dirty = true;
1519 range = _regmap_range_lookup(map, reg);
1521 int val_num = val_len / map->format.val_bytes;
1522 int win_offset = (reg - range->range_min) % range->window_len;
1523 int win_residue = range->window_len - win_offset;
1525 /* If the write goes beyond the end of the window split it */
1526 while (val_num > win_residue) {
1527 dev_dbg(map->dev, "Writing window %d/%zu\n",
1528 win_residue, val_len / map->format.val_bytes);
1529 ret = _regmap_raw_write_impl(map, reg, val,
1531 map->format.val_bytes);
1536 val_num -= win_residue;
1537 val += win_residue * map->format.val_bytes;
1538 val_len -= win_residue * map->format.val_bytes;
1540 win_offset = (reg - range->range_min) %
1542 win_residue = range->window_len - win_offset;
1545 ret = _regmap_select_page(map, ®, range, val_num);
1550 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1551 regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
1552 map->write_flag_mask);
1555 * Essentially all I/O mechanisms will be faster with a single
1556 * buffer to write. Since register syncs often generate raw
1557 * writes of single registers optimise that case.
1559 if (val != work_val && val_len == map->format.val_bytes) {
1560 memcpy(work_val, val, map->format.val_bytes);
1564 if (map->async && map->bus->async_write) {
1565 struct regmap_async *async;
1567 trace_regmap_async_write_start(map, reg, val_len);
1569 spin_lock_irqsave(&map->async_lock, flags);
1570 async = list_first_entry_or_null(&map->async_free,
1571 struct regmap_async,
1574 list_del(&async->list);
1575 spin_unlock_irqrestore(&map->async_lock, flags);
1578 async = map->bus->async_alloc();
1582 async->work_buf = kzalloc(map->format.buf_size,
1583 GFP_KERNEL | GFP_DMA);
1584 if (!async->work_buf) {
1592 /* If the caller supplied the value we can use it safely. */
1593 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1594 map->format.reg_bytes + map->format.val_bytes);
1596 spin_lock_irqsave(&map->async_lock, flags);
1597 list_add_tail(&async->list, &map->async_list);
1598 spin_unlock_irqrestore(&map->async_lock, flags);
1600 if (val != work_val)
1601 ret = map->bus->async_write(map->bus_context,
1603 map->format.reg_bytes +
1604 map->format.pad_bytes,
1605 val, val_len, async);
1607 ret = map->bus->async_write(map->bus_context,
1609 map->format.reg_bytes +
1610 map->format.pad_bytes +
1611 val_len, NULL, 0, async);
1614 dev_err(map->dev, "Failed to schedule write: %d\n",
1617 spin_lock_irqsave(&map->async_lock, flags);
1618 list_move(&async->list, &map->async_free);
1619 spin_unlock_irqrestore(&map->async_lock, flags);
1625 trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1627 /* If we're doing a single register write we can probably just
1628 * send the work_buf directly, otherwise try to do a gather
1631 if (val == work_val)
1632 ret = map->bus->write(map->bus_context, map->work_buf,
1633 map->format.reg_bytes +
1634 map->format.pad_bytes +
1636 else if (map->bus->gather_write)
1637 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1638 map->format.reg_bytes +
1639 map->format.pad_bytes,
1644 /* If that didn't work fall back on linearising by hand. */
1645 if (ret == -ENOTSUPP) {
1646 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1647 buf = kzalloc(len, GFP_KERNEL);
1651 memcpy(buf, map->work_buf, map->format.reg_bytes);
1652 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1654 ret = map->bus->write(map->bus_context, buf, len);
1657 } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
1658 /* regcache_drop_region() takes lock that we already have,
1659 * thus call map->cache_ops->drop() directly
1661 if (map->cache_ops && map->cache_ops->drop)
1662 map->cache_ops->drop(map, reg, reg + 1);
1665 trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1671 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1673 * @map: Map to check.
1675 bool regmap_can_raw_write(struct regmap *map)
1677 return map->bus && map->bus->write && map->format.format_val &&
1678 map->format.format_reg;
1680 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1683 * regmap_get_raw_read_max - Get the maximum size we can read
1685 * @map: Map to check.
1687 size_t regmap_get_raw_read_max(struct regmap *map)
1689 return map->max_raw_read;
1691 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
1694 * regmap_get_raw_write_max - Get the maximum size we can read
1696 * @map: Map to check.
1698 size_t regmap_get_raw_write_max(struct regmap *map)
1700 return map->max_raw_write;
1702 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
1704 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1708 struct regmap_range_node *range;
1709 struct regmap *map = context;
1711 WARN_ON(!map->bus || !map->format.format_write);
1713 range = _regmap_range_lookup(map, reg);
1715 ret = _regmap_select_page(map, ®, range, 1);
1720 map->format.format_write(map, reg, val);
1722 trace_regmap_hw_write_start(map, reg, 1);
1724 ret = map->bus->write(map->bus_context, map->work_buf,
1725 map->format.buf_size);
1727 trace_regmap_hw_write_done(map, reg, 1);
1732 static int _regmap_bus_reg_write(void *context, unsigned int reg,
1735 struct regmap *map = context;
1737 return map->bus->reg_write(map->bus_context, reg, val);
1740 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1743 struct regmap *map = context;
1745 WARN_ON(!map->bus || !map->format.format_val);
1747 map->format.format_val(map->work_buf + map->format.reg_bytes
1748 + map->format.pad_bytes, val, 0);
1749 return _regmap_raw_write_impl(map, reg,
1751 map->format.reg_bytes +
1752 map->format.pad_bytes,
1753 map->format.val_bytes);
1756 static inline void *_regmap_map_get_context(struct regmap *map)
1758 return (map->bus) ? map : map->bus_context;
1761 int _regmap_write(struct regmap *map, unsigned int reg,
1765 void *context = _regmap_map_get_context(map);
1767 if (!regmap_writeable(map, reg))
1770 if (!map->cache_bypass && !map->defer_caching) {
1771 ret = regcache_write(map, reg, val);
1774 if (map->cache_only) {
1775 map->cache_dirty = true;
1780 if (regmap_should_log(map))
1781 dev_info(map->dev, "%x <= %x\n", reg, val);
1783 trace_regmap_reg_write(map, reg, val);
1785 return map->reg_write(context, reg, val);
1789 * regmap_write() - Write a value to a single register
1791 * @map: Register map to write to
1792 * @reg: Register to write to
1793 * @val: Value to be written
1795 * A value of zero will be returned on success, a negative errno will
1796 * be returned in error cases.
1798 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1802 if (!IS_ALIGNED(reg, map->reg_stride))
1805 map->lock(map->lock_arg);
1807 ret = _regmap_write(map, reg, val);
1809 map->unlock(map->lock_arg);
1813 EXPORT_SYMBOL_GPL(regmap_write);
1816 * regmap_write_async() - Write a value to a single register asynchronously
1818 * @map: Register map to write to
1819 * @reg: Register to write to
1820 * @val: Value to be written
1822 * A value of zero will be returned on success, a negative errno will
1823 * be returned in error cases.
1825 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1829 if (!IS_ALIGNED(reg, map->reg_stride))
1832 map->lock(map->lock_arg);
1836 ret = _regmap_write(map, reg, val);
1840 map->unlock(map->lock_arg);
1844 EXPORT_SYMBOL_GPL(regmap_write_async);
1846 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1847 const void *val, size_t val_len)
1849 size_t val_bytes = map->format.val_bytes;
1850 size_t val_count = val_len / val_bytes;
1851 size_t chunk_count, chunk_bytes;
1852 size_t chunk_regs = val_count;
1858 if (map->use_single_write)
1860 else if (map->max_raw_write && val_len > map->max_raw_write)
1861 chunk_regs = map->max_raw_write / val_bytes;
1863 chunk_count = val_count / chunk_regs;
1864 chunk_bytes = chunk_regs * val_bytes;
1866 /* Write as many bytes as possible with chunk_size */
1867 for (i = 0; i < chunk_count; i++) {
1868 ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes);
1872 reg += regmap_get_offset(map, chunk_regs);
1874 val_len -= chunk_bytes;
1877 /* Write remaining bytes */
1879 ret = _regmap_raw_write_impl(map, reg, val, val_len);
1885 * regmap_raw_write() - Write raw values to one or more registers
1887 * @map: Register map to write to
1888 * @reg: Initial register to write to
1889 * @val: Block of data to be written, laid out for direct transmission to the
1891 * @val_len: Length of data pointed to by val.
1893 * This function is intended to be used for things like firmware
1894 * download where a large block of data needs to be transferred to the
1895 * device. No formatting will be done on the data provided.
1897 * A value of zero will be returned on success, a negative errno will
1898 * be returned in error cases.
1900 int regmap_raw_write(struct regmap *map, unsigned int reg,
1901 const void *val, size_t val_len)
1905 if (!regmap_can_raw_write(map))
1907 if (val_len % map->format.val_bytes)
1910 map->lock(map->lock_arg);
1912 ret = _regmap_raw_write(map, reg, val, val_len);
1914 map->unlock(map->lock_arg);
1918 EXPORT_SYMBOL_GPL(regmap_raw_write);
1921 * regmap_noinc_write(): Write data from a register without incrementing the
1924 * @map: Register map to write to
1925 * @reg: Register to write to
1926 * @val: Pointer to data buffer
1927 * @val_len: Length of output buffer in bytes.
1929 * The regmap API usually assumes that bulk bus write operations will write a
1930 * range of registers. Some devices have certain registers for which a write
1931 * operation can write to an internal FIFO.
1933 * The target register must be volatile but registers after it can be
1934 * completely unrelated cacheable registers.
1936 * This will attempt multiple writes as required to write val_len bytes.
1938 * A value of zero will be returned on success, a negative errno will be
1939 * returned in error cases.
1941 int regmap_noinc_write(struct regmap *map, unsigned int reg,
1942 const void *val, size_t val_len)
1949 if (!map->bus->write)
1951 if (val_len % map->format.val_bytes)
1953 if (!IS_ALIGNED(reg, map->reg_stride))
1958 map->lock(map->lock_arg);
1960 if (!regmap_volatile(map, reg) || !regmap_writeable_noinc(map, reg)) {
1966 if (map->max_raw_write && map->max_raw_write < val_len)
1967 write_len = map->max_raw_write;
1969 write_len = val_len;
1970 ret = _regmap_raw_write(map, reg, val, write_len);
1973 val = ((u8 *)val) + write_len;
1974 val_len -= write_len;
1978 map->unlock(map->lock_arg);
1981 EXPORT_SYMBOL_GPL(regmap_noinc_write);
1984 * regmap_field_update_bits_base() - Perform a read/modify/write cycle a
1987 * @field: Register field to write to
1988 * @mask: Bitmask to change
1989 * @val: Value to be written
1990 * @change: Boolean indicating if a write was done
1991 * @async: Boolean indicating asynchronously
1992 * @force: Boolean indicating use force update
1994 * Perform a read/modify/write cycle on the register field with change,
1995 * async, force option.
1997 * A value of zero will be returned on success, a negative errno will
1998 * be returned in error cases.
2000 int regmap_field_update_bits_base(struct regmap_field *field,
2001 unsigned int mask, unsigned int val,
2002 bool *change, bool async, bool force)
2004 mask = (mask << field->shift) & field->mask;
2006 return regmap_update_bits_base(field->regmap, field->reg,
2007 mask, val << field->shift,
2008 change, async, force);
2010 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
2013 * regmap_fields_update_bits_base() - Perform a read/modify/write cycle a
2014 * register field with port ID
2016 * @field: Register field to write to
2018 * @mask: Bitmask to change
2019 * @val: Value to be written
2020 * @change: Boolean indicating if a write was done
2021 * @async: Boolean indicating asynchronously
2022 * @force: Boolean indicating use force update
2024 * A value of zero will be returned on success, a negative errno will
2025 * be returned in error cases.
2027 int regmap_fields_update_bits_base(struct regmap_field *field, unsigned int id,
2028 unsigned int mask, unsigned int val,
2029 bool *change, bool async, bool force)
2031 if (id >= field->id_size)
2034 mask = (mask << field->shift) & field->mask;
2036 return regmap_update_bits_base(field->regmap,
2037 field->reg + (field->id_offset * id),
2038 mask, val << field->shift,
2039 change, async, force);
2041 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
2044 * regmap_bulk_write() - Write multiple registers to the device
2046 * @map: Register map to write to
2047 * @reg: First register to be write from
2048 * @val: Block of data to be written, in native register size for device
2049 * @val_count: Number of registers to write
2051 * This function is intended to be used for writing a large block of
2052 * data to the device either in single transfer or multiple transfer.
2054 * A value of zero will be returned on success, a negative errno will
2055 * be returned in error cases.
2057 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
2061 size_t val_bytes = map->format.val_bytes;
2063 if (!IS_ALIGNED(reg, map->reg_stride))
2067 * Some devices don't support bulk write, for them we have a series of
2068 * single write operations.
2070 if (!map->bus || !map->format.parse_inplace) {
2071 map->lock(map->lock_arg);
2072 for (i = 0; i < val_count; i++) {
2075 switch (val_bytes) {
2077 ival = *(u8 *)(val + (i * val_bytes));
2080 ival = *(u16 *)(val + (i * val_bytes));
2083 ival = *(u32 *)(val + (i * val_bytes));
2087 ival = *(u64 *)(val + (i * val_bytes));
2095 ret = _regmap_write(map,
2096 reg + regmap_get_offset(map, i),
2102 map->unlock(map->lock_arg);
2106 wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
2110 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2111 map->format.parse_inplace(wval + i);
2113 ret = regmap_raw_write(map, reg, wval, val_bytes * val_count);
2119 EXPORT_SYMBOL_GPL(regmap_bulk_write);
2122 * _regmap_raw_multi_reg_write()
2124 * the (register,newvalue) pairs in regs have not been formatted, but
2125 * they are all in the same page and have been changed to being page
2126 * relative. The page register has been written if that was necessary.
2128 static int _regmap_raw_multi_reg_write(struct regmap *map,
2129 const struct reg_sequence *regs,
2136 size_t val_bytes = map->format.val_bytes;
2137 size_t reg_bytes = map->format.reg_bytes;
2138 size_t pad_bytes = map->format.pad_bytes;
2139 size_t pair_size = reg_bytes + pad_bytes + val_bytes;
2140 size_t len = pair_size * num_regs;
2145 buf = kzalloc(len, GFP_KERNEL);
2149 /* We have to linearise by hand. */
2153 for (i = 0; i < num_regs; i++) {
2154 unsigned int reg = regs[i].reg;
2155 unsigned int val = regs[i].def;
2156 trace_regmap_hw_write_start(map, reg, 1);
2157 map->format.format_reg(u8, reg, map->reg_shift);
2158 u8 += reg_bytes + pad_bytes;
2159 map->format.format_val(u8, val, 0);
2163 *u8 |= map->write_flag_mask;
2165 ret = map->bus->write(map->bus_context, buf, len);
2169 for (i = 0; i < num_regs; i++) {
2170 int reg = regs[i].reg;
2171 trace_regmap_hw_write_done(map, reg, 1);
2176 static unsigned int _regmap_register_page(struct regmap *map,
2178 struct regmap_range_node *range)
2180 unsigned int win_page = (reg - range->range_min) / range->window_len;
2185 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
2186 struct reg_sequence *regs,
2191 struct reg_sequence *base;
2192 unsigned int this_page = 0;
2193 unsigned int page_change = 0;
2195 * the set of registers are not neccessarily in order, but
2196 * since the order of write must be preserved this algorithm
2197 * chops the set each time the page changes. This also applies
2198 * if there is a delay required at any point in the sequence.
2201 for (i = 0, n = 0; i < num_regs; i++, n++) {
2202 unsigned int reg = regs[i].reg;
2203 struct regmap_range_node *range;
2205 range = _regmap_range_lookup(map, reg);
2207 unsigned int win_page = _regmap_register_page(map, reg,
2211 this_page = win_page;
2212 if (win_page != this_page) {
2213 this_page = win_page;
2218 /* If we have both a page change and a delay make sure to
2219 * write the regs and apply the delay before we change the
2223 if (page_change || regs[i].delay_us) {
2225 /* For situations where the first write requires
2226 * a delay we need to make sure we don't call
2227 * raw_multi_reg_write with n=0
2228 * This can't occur with page breaks as we
2229 * never write on the first iteration
2231 if (regs[i].delay_us && i == 0)
2234 ret = _regmap_raw_multi_reg_write(map, base, n);
2238 if (regs[i].delay_us)
2239 udelay(regs[i].delay_us);
2245 ret = _regmap_select_page(map,
2258 return _regmap_raw_multi_reg_write(map, base, n);
2262 static int _regmap_multi_reg_write(struct regmap *map,
2263 const struct reg_sequence *regs,
2269 if (!map->can_multi_write) {
2270 for (i = 0; i < num_regs; i++) {
2271 ret = _regmap_write(map, regs[i].reg, regs[i].def);
2275 if (regs[i].delay_us)
2276 udelay(regs[i].delay_us);
2281 if (!map->format.parse_inplace)
2284 if (map->writeable_reg)
2285 for (i = 0; i < num_regs; i++) {
2286 int reg = regs[i].reg;
2287 if (!map->writeable_reg(map->dev, reg))
2289 if (!IS_ALIGNED(reg, map->reg_stride))
2293 if (!map->cache_bypass) {
2294 for (i = 0; i < num_regs; i++) {
2295 unsigned int val = regs[i].def;
2296 unsigned int reg = regs[i].reg;
2297 ret = regcache_write(map, reg, val);
2300 "Error in caching of register: %x ret: %d\n",
2305 if (map->cache_only) {
2306 map->cache_dirty = true;
2313 for (i = 0; i < num_regs; i++) {
2314 unsigned int reg = regs[i].reg;
2315 struct regmap_range_node *range;
2317 /* Coalesce all the writes between a page break or a delay
2320 range = _regmap_range_lookup(map, reg);
2321 if (range || regs[i].delay_us) {
2322 size_t len = sizeof(struct reg_sequence)*num_regs;
2323 struct reg_sequence *base = kmemdup(regs, len,
2327 ret = _regmap_range_multi_paged_reg_write(map, base,
2334 return _regmap_raw_multi_reg_write(map, regs, num_regs);
2338 * regmap_multi_reg_write() - Write multiple registers to the device
2340 * @map: Register map to write to
2341 * @regs: Array of structures containing register,value to be written
2342 * @num_regs: Number of registers to write
2344 * Write multiple registers to the device where the set of register, value
2345 * pairs are supplied in any order, possibly not all in a single range.
2347 * The 'normal' block write mode will send ultimately send data on the
2348 * target bus as R,V1,V2,V3,..,Vn where successively higher registers are
2349 * addressed. However, this alternative block multi write mode will send
2350 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2351 * must of course support the mode.
2353 * A value of zero will be returned on success, a negative errno will be
2354 * returned in error cases.
2356 int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
2361 map->lock(map->lock_arg);
2363 ret = _regmap_multi_reg_write(map, regs, num_regs);
2365 map->unlock(map->lock_arg);
2369 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
2372 * regmap_multi_reg_write_bypassed() - Write multiple registers to the
2373 * device but not the cache
2375 * @map: Register map to write to
2376 * @regs: Array of structures containing register,value to be written
2377 * @num_regs: Number of registers to write
2379 * Write multiple registers to the device but not the cache where the set
2380 * of register are supplied in any order.
2382 * This function is intended to be used for writing a large block of data
2383 * atomically to the device in single transfer for those I2C client devices
2384 * that implement this alternative block write mode.
2386 * A value of zero will be returned on success, a negative errno will
2387 * be returned in error cases.
2389 int regmap_multi_reg_write_bypassed(struct regmap *map,
2390 const struct reg_sequence *regs,
2396 map->lock(map->lock_arg);
2398 bypass = map->cache_bypass;
2399 map->cache_bypass = true;
2401 ret = _regmap_multi_reg_write(map, regs, num_regs);
2403 map->cache_bypass = bypass;
2405 map->unlock(map->lock_arg);
2409 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
2412 * regmap_raw_write_async() - Write raw values to one or more registers
2415 * @map: Register map to write to
2416 * @reg: Initial register to write to
2417 * @val: Block of data to be written, laid out for direct transmission to the
2418 * device. Must be valid until regmap_async_complete() is called.
2419 * @val_len: Length of data pointed to by val.
2421 * This function is intended to be used for things like firmware
2422 * download where a large block of data needs to be transferred to the
2423 * device. No formatting will be done on the data provided.
2425 * If supported by the underlying bus the write will be scheduled
2426 * asynchronously, helping maximise I/O speed on higher speed buses
2427 * like SPI. regmap_async_complete() can be called to ensure that all
2428 * asynchrnous writes have been completed.
2430 * A value of zero will be returned on success, a negative errno will
2431 * be returned in error cases.
2433 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2434 const void *val, size_t val_len)
2438 if (val_len % map->format.val_bytes)
2440 if (!IS_ALIGNED(reg, map->reg_stride))
2443 map->lock(map->lock_arg);
2447 ret = _regmap_raw_write(map, reg, val, val_len);
2451 map->unlock(map->lock_arg);
2455 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2457 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2458 unsigned int val_len)
2460 struct regmap_range_node *range;
2465 if (!map->bus || !map->bus->read)
2468 range = _regmap_range_lookup(map, reg);
2470 ret = _regmap_select_page(map, ®, range,
2471 val_len / map->format.val_bytes);
2476 map->format.format_reg(map->work_buf, reg, map->reg_shift);
2477 regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
2478 map->read_flag_mask);
2479 trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2481 ret = map->bus->read(map->bus_context, map->work_buf,
2482 map->format.reg_bytes + map->format.pad_bytes,
2485 trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2490 static int _regmap_bus_reg_read(void *context, unsigned int reg,
2493 struct regmap *map = context;
2495 return map->bus->reg_read(map->bus_context, reg, val);
2498 static int _regmap_bus_read(void *context, unsigned int reg,
2502 struct regmap *map = context;
2503 void *work_val = map->work_buf + map->format.reg_bytes +
2504 map->format.pad_bytes;
2506 if (!map->format.parse_val)
2509 ret = _regmap_raw_read(map, reg, work_val, map->format.val_bytes);
2511 *val = map->format.parse_val(work_val);
2516 static int _regmap_read(struct regmap *map, unsigned int reg,
2520 void *context = _regmap_map_get_context(map);
2522 if (!map->cache_bypass) {
2523 ret = regcache_read(map, reg, val);
2528 if (map->cache_only)
2531 if (!regmap_readable(map, reg))
2534 ret = map->reg_read(context, reg, val);
2536 if (regmap_should_log(map))
2537 dev_info(map->dev, "%x => %x\n", reg, *val);
2539 trace_regmap_reg_read(map, reg, *val);
2541 if (!map->cache_bypass)
2542 regcache_write(map, reg, *val);
2549 * regmap_read() - Read a value from a single register
2551 * @map: Register map to read from
2552 * @reg: Register to be read from
2553 * @val: Pointer to store read value
2555 * A value of zero will be returned on success, a negative errno will
2556 * be returned in error cases.
2558 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2562 if (!IS_ALIGNED(reg, map->reg_stride))
2565 map->lock(map->lock_arg);
2567 ret = _regmap_read(map, reg, val);
2569 map->unlock(map->lock_arg);
2573 EXPORT_SYMBOL_GPL(regmap_read);
2576 * regmap_raw_read() - Read raw data from the device
2578 * @map: Register map to read from
2579 * @reg: First register to be read from
2580 * @val: Pointer to store read value
2581 * @val_len: Size of data to read
2583 * A value of zero will be returned on success, a negative errno will
2584 * be returned in error cases.
2586 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2589 size_t val_bytes = map->format.val_bytes;
2590 size_t val_count = val_len / val_bytes;
2596 if (val_len % map->format.val_bytes)
2598 if (!IS_ALIGNED(reg, map->reg_stride))
2603 map->lock(map->lock_arg);
2605 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2606 map->cache_type == REGCACHE_NONE) {
2607 size_t chunk_count, chunk_bytes;
2608 size_t chunk_regs = val_count;
2610 if (!map->bus->read) {
2615 if (map->use_single_read)
2617 else if (map->max_raw_read && val_len > map->max_raw_read)
2618 chunk_regs = map->max_raw_read / val_bytes;
2620 chunk_count = val_count / chunk_regs;
2621 chunk_bytes = chunk_regs * val_bytes;
2623 /* Read bytes that fit into whole chunks */
2624 for (i = 0; i < chunk_count; i++) {
2625 ret = _regmap_raw_read(map, reg, val, chunk_bytes);
2629 reg += regmap_get_offset(map, chunk_regs);
2631 val_len -= chunk_bytes;
2634 /* Read remaining bytes */
2636 ret = _regmap_raw_read(map, reg, val, val_len);
2641 /* Otherwise go word by word for the cache; should be low
2642 * cost as we expect to hit the cache.
2644 for (i = 0; i < val_count; i++) {
2645 ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2650 map->format.format_val(val + (i * val_bytes), v, 0);
2655 map->unlock(map->lock_arg);
2659 EXPORT_SYMBOL_GPL(regmap_raw_read);
2662 * regmap_noinc_read(): Read data from a register without incrementing the
2665 * @map: Register map to read from
2666 * @reg: Register to read from
2667 * @val: Pointer to data buffer
2668 * @val_len: Length of output buffer in bytes.
2670 * The regmap API usually assumes that bulk bus read operations will read a
2671 * range of registers. Some devices have certain registers for which a read
2672 * operation read will read from an internal FIFO.
2674 * The target register must be volatile but registers after it can be
2675 * completely unrelated cacheable registers.
2677 * This will attempt multiple reads as required to read val_len bytes.
2679 * A value of zero will be returned on success, a negative errno will be
2680 * returned in error cases.
2682 int regmap_noinc_read(struct regmap *map, unsigned int reg,
2683 void *val, size_t val_len)
2690 if (!map->bus->read)
2692 if (val_len % map->format.val_bytes)
2694 if (!IS_ALIGNED(reg, map->reg_stride))
2699 map->lock(map->lock_arg);
2701 if (!regmap_volatile(map, reg) || !regmap_readable_noinc(map, reg)) {
2707 if (map->max_raw_read && map->max_raw_read < val_len)
2708 read_len = map->max_raw_read;
2711 ret = _regmap_raw_read(map, reg, val, read_len);
2714 val = ((u8 *)val) + read_len;
2715 val_len -= read_len;
2719 map->unlock(map->lock_arg);
2722 EXPORT_SYMBOL_GPL(regmap_noinc_read);
2725 * regmap_field_read(): Read a value to a single register field
2727 * @field: Register field to read from
2728 * @val: Pointer to store read value
2730 * A value of zero will be returned on success, a negative errno will
2731 * be returned in error cases.
2733 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2736 unsigned int reg_val;
2737 ret = regmap_read(field->regmap, field->reg, ®_val);
2741 reg_val &= field->mask;
2742 reg_val >>= field->shift;
2747 EXPORT_SYMBOL_GPL(regmap_field_read);
2750 * regmap_fields_read() - Read a value to a single register field with port ID
2752 * @field: Register field to read from
2754 * @val: Pointer to store read value
2756 * A value of zero will be returned on success, a negative errno will
2757 * be returned in error cases.
2759 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2763 unsigned int reg_val;
2765 if (id >= field->id_size)
2768 ret = regmap_read(field->regmap,
2769 field->reg + (field->id_offset * id),
2774 reg_val &= field->mask;
2775 reg_val >>= field->shift;
2780 EXPORT_SYMBOL_GPL(regmap_fields_read);
2783 * regmap_bulk_read() - Read multiple registers from the device
2785 * @map: Register map to read from
2786 * @reg: First register to be read from
2787 * @val: Pointer to store read value, in native register size for device
2788 * @val_count: Number of registers to read
2790 * A value of zero will be returned on success, a negative errno will
2791 * be returned in error cases.
2793 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2797 size_t val_bytes = map->format.val_bytes;
2798 bool vol = regmap_volatile_range(map, reg, val_count);
2800 if (!IS_ALIGNED(reg, map->reg_stride))
2805 if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2806 ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
2810 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2811 map->format.parse_inplace(val + i);
2820 map->lock(map->lock_arg);
2822 for (i = 0; i < val_count; i++) {
2825 ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2830 switch (map->format.val_bytes) {
2852 map->unlock(map->lock_arg);
2857 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2859 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2860 unsigned int mask, unsigned int val,
2861 bool *change, bool force_write)
2864 unsigned int tmp, orig;
2869 if (regmap_volatile(map, reg) && map->reg_update_bits) {
2870 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
2871 if (ret == 0 && change)
2874 ret = _regmap_read(map, reg, &orig);
2881 if (force_write || (tmp != orig)) {
2882 ret = _regmap_write(map, reg, tmp);
2883 if (ret == 0 && change)
2892 * regmap_update_bits_base() - Perform a read/modify/write cycle on a register
2894 * @map: Register map to update
2895 * @reg: Register to update
2896 * @mask: Bitmask to change
2897 * @val: New value for bitmask
2898 * @change: Boolean indicating if a write was done
2899 * @async: Boolean indicating asynchronously
2900 * @force: Boolean indicating use force update
2902 * Perform a read/modify/write cycle on a register map with change, async, force
2907 * With most buses the read must be done synchronously so this is most useful
2908 * for devices with a cache which do not need to interact with the hardware to
2909 * determine the current register value.
2911 * Returns zero for success, a negative number on error.
2913 int regmap_update_bits_base(struct regmap *map, unsigned int reg,
2914 unsigned int mask, unsigned int val,
2915 bool *change, bool async, bool force)
2919 map->lock(map->lock_arg);
2923 ret = _regmap_update_bits(map, reg, mask, val, change, force);
2927 map->unlock(map->lock_arg);
2931 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
2934 * regmap_test_bits() - Check if all specified bits are set in a register.
2936 * @map: Register map to operate on
2937 * @reg: Register to read from
2938 * @bits: Bits to test
2940 * Returns 0 if at least one of the tested bits is not set, 1 if all tested
2941 * bits are set and a negative error number if the underlying regmap_read()
2944 int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits)
2946 unsigned int val, ret;
2948 ret = regmap_read(map, reg, &val);
2952 return (val & bits) == bits;
2954 EXPORT_SYMBOL_GPL(regmap_test_bits);
2956 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2958 struct regmap *map = async->map;
2961 trace_regmap_async_io_complete(map);
2963 spin_lock(&map->async_lock);
2964 list_move(&async->list, &map->async_free);
2965 wake = list_empty(&map->async_list);
2968 map->async_ret = ret;
2970 spin_unlock(&map->async_lock);
2973 wake_up(&map->async_waitq);
2975 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2977 static int regmap_async_is_done(struct regmap *map)
2979 unsigned long flags;
2982 spin_lock_irqsave(&map->async_lock, flags);
2983 ret = list_empty(&map->async_list);
2984 spin_unlock_irqrestore(&map->async_lock, flags);
2990 * regmap_async_complete - Ensure all asynchronous I/O has completed.
2992 * @map: Map to operate on.
2994 * Blocks until any pending asynchronous I/O has completed. Returns
2995 * an error code for any failed I/O operations.
2997 int regmap_async_complete(struct regmap *map)
2999 unsigned long flags;
3002 /* Nothing to do with no async support */
3003 if (!map->bus || !map->bus->async_write)
3006 trace_regmap_async_complete_start(map);
3008 wait_event(map->async_waitq, regmap_async_is_done(map));
3010 spin_lock_irqsave(&map->async_lock, flags);
3011 ret = map->async_ret;
3013 spin_unlock_irqrestore(&map->async_lock, flags);
3015 trace_regmap_async_complete_done(map);
3019 EXPORT_SYMBOL_GPL(regmap_async_complete);
3022 * regmap_register_patch - Register and apply register updates to be applied
3023 * on device initialistion
3025 * @map: Register map to apply updates to.
3026 * @regs: Values to update.
3027 * @num_regs: Number of entries in regs.
3029 * Register a set of register updates to be applied to the device
3030 * whenever the device registers are synchronised with the cache and
3031 * apply them immediately. Typically this is used to apply
3032 * corrections to be applied to the device defaults on startup, such
3033 * as the updates some vendors provide to undocumented registers.
3035 * The caller must ensure that this function cannot be called
3036 * concurrently with either itself or regcache_sync().
3038 int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
3041 struct reg_sequence *p;
3045 if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
3049 p = krealloc(map->patch,
3050 sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
3053 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
3055 map->patch_regs += num_regs;
3060 map->lock(map->lock_arg);
3062 bypass = map->cache_bypass;
3064 map->cache_bypass = true;
3067 ret = _regmap_multi_reg_write(map, regs, num_regs);
3070 map->cache_bypass = bypass;
3072 map->unlock(map->lock_arg);
3074 regmap_async_complete(map);
3078 EXPORT_SYMBOL_GPL(regmap_register_patch);
3081 * regmap_get_val_bytes() - Report the size of a register value
3083 * @map: Register map to operate on.
3085 * Report the size of a register value, mainly intended to for use by
3086 * generic infrastructure built on top of regmap.
3088 int regmap_get_val_bytes(struct regmap *map)
3090 if (map->format.format_write)
3093 return map->format.val_bytes;
3095 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
3098 * regmap_get_max_register() - Report the max register value
3100 * @map: Register map to operate on.
3102 * Report the max register value, mainly intended to for use by
3103 * generic infrastructure built on top of regmap.
3105 int regmap_get_max_register(struct regmap *map)
3107 return map->max_register ? map->max_register : -EINVAL;
3109 EXPORT_SYMBOL_GPL(regmap_get_max_register);
3112 * regmap_get_reg_stride() - Report the register address stride
3114 * @map: Register map to operate on.
3116 * Report the register address stride, mainly intended to for use by
3117 * generic infrastructure built on top of regmap.
3119 int regmap_get_reg_stride(struct regmap *map)
3121 return map->reg_stride;
3123 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
3125 int regmap_parse_val(struct regmap *map, const void *buf,
3128 if (!map->format.parse_val)
3131 *val = map->format.parse_val(buf);
3135 EXPORT_SYMBOL_GPL(regmap_parse_val);
3137 static int __init regmap_initcall(void)
3139 regmap_debugfs_initcall();
3143 postcore_initcall(regmap_initcall);