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>
18 #include <linux/rbtree.h>
19 #include <linux/sched.h>
21 #define CREATE_TRACE_POINTS
22 #include <trace/events/regmap.h>
27 * Sometimes for failures during very early init the trace
28 * infrastructure isn't available early enough to be used. For this
29 * sort of problem defining LOG_DEVICE will add printks for basic
30 * register I/O on a specific device.
34 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
35 unsigned int mask, unsigned int val,
38 static int _regmap_bus_read(void *context, unsigned int reg,
40 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
42 static int _regmap_bus_raw_write(void *context, unsigned int reg,
45 static void async_cleanup(struct work_struct *work)
47 struct regmap_async *async = container_of(work, struct regmap_async,
50 kfree(async->work_buf);
54 bool regmap_reg_in_ranges(unsigned int reg,
55 const struct regmap_range *ranges,
58 const struct regmap_range *r;
61 for (i = 0, r = ranges; i < nranges; i++, r++)
62 if (regmap_reg_in_range(reg, r))
66 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
68 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
69 const struct regmap_access_table *table)
71 /* Check "no ranges" first */
72 if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
75 /* In case zero "yes ranges" are supplied, any reg is OK */
76 if (!table->n_yes_ranges)
79 return regmap_reg_in_ranges(reg, table->yes_ranges,
82 EXPORT_SYMBOL_GPL(regmap_check_range_table);
84 bool regmap_writeable(struct regmap *map, unsigned int reg)
86 if (map->max_register && reg > map->max_register)
89 if (map->writeable_reg)
90 return map->writeable_reg(map->dev, reg);
93 return regmap_check_range_table(map, reg, map->wr_table);
98 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 (!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_native(void *buf, unsigned int val,
207 *(u16 *)buf = val << shift;
210 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
221 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
225 b[0] = cpu_to_be32(val << shift);
228 static void regmap_format_32_native(void *buf, unsigned int val,
231 *(u32 *)buf = val << shift;
234 static void regmap_parse_inplace_noop(void *buf)
238 static unsigned int regmap_parse_8(const void *buf)
245 static unsigned int regmap_parse_16_be(const void *buf)
247 const __be16 *b = buf;
249 return be16_to_cpu(b[0]);
252 static void regmap_parse_16_be_inplace(void *buf)
256 b[0] = be16_to_cpu(b[0]);
259 static unsigned int regmap_parse_16_native(const void *buf)
264 static unsigned int regmap_parse_24(const void *buf)
267 unsigned int ret = b[2];
268 ret |= ((unsigned int)b[1]) << 8;
269 ret |= ((unsigned int)b[0]) << 16;
274 static unsigned int regmap_parse_32_be(const void *buf)
276 const __be32 *b = buf;
278 return be32_to_cpu(b[0]);
281 static void regmap_parse_32_be_inplace(void *buf)
285 b[0] = be32_to_cpu(b[0]);
288 static unsigned int regmap_parse_32_native(const void *buf)
293 static void regmap_lock_mutex(void *__map)
295 struct regmap *map = __map;
296 mutex_lock(&map->mutex);
299 static void regmap_unlock_mutex(void *__map)
301 struct regmap *map = __map;
302 mutex_unlock(&map->mutex);
305 static void regmap_lock_spinlock(void *__map)
306 __acquires(&map->spinlock)
308 struct regmap *map = __map;
311 spin_lock_irqsave(&map->spinlock, flags);
312 map->spinlock_flags = flags;
315 static void regmap_unlock_spinlock(void *__map)
316 __releases(&map->spinlock)
318 struct regmap *map = __map;
319 spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
322 static void dev_get_regmap_release(struct device *dev, void *res)
325 * We don't actually have anything to do here; the goal here
326 * is not to manage the regmap but to provide a simple way to
327 * get the regmap back given a struct device.
331 static bool _regmap_range_add(struct regmap *map,
332 struct regmap_range_node *data)
334 struct rb_root *root = &map->range_tree;
335 struct rb_node **new = &(root->rb_node), *parent = NULL;
338 struct regmap_range_node *this =
339 container_of(*new, struct regmap_range_node, node);
342 if (data->range_max < this->range_min)
343 new = &((*new)->rb_left);
344 else if (data->range_min > this->range_max)
345 new = &((*new)->rb_right);
350 rb_link_node(&data->node, parent, new);
351 rb_insert_color(&data->node, root);
356 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
359 struct rb_node *node = map->range_tree.rb_node;
362 struct regmap_range_node *this =
363 container_of(node, struct regmap_range_node, node);
365 if (reg < this->range_min)
366 node = node->rb_left;
367 else if (reg > this->range_max)
368 node = node->rb_right;
376 static void regmap_range_exit(struct regmap *map)
378 struct rb_node *next;
379 struct regmap_range_node *range_node;
381 next = rb_first(&map->range_tree);
383 range_node = rb_entry(next, struct regmap_range_node, node);
384 next = rb_next(&range_node->node);
385 rb_erase(&range_node->node, &map->range_tree);
389 kfree(map->selector_work_buf);
393 * regmap_init(): Initialise register map
395 * @dev: Device that will be interacted with
396 * @bus: Bus-specific callbacks to use with device
397 * @bus_context: Data passed to bus-specific callbacks
398 * @config: Configuration for register map
400 * The return value will be an ERR_PTR() on error or a valid pointer to
401 * a struct regmap. This function should generally not be called
402 * directly, it should be called by bus-specific init functions.
404 struct regmap *regmap_init(struct device *dev,
405 const struct regmap_bus *bus,
407 const struct regmap_config *config)
409 struct regmap *map, **m;
411 enum regmap_endian reg_endian, val_endian;
417 map = kzalloc(sizeof(*map), GFP_KERNEL);
423 if (config->lock && config->unlock) {
424 map->lock = config->lock;
425 map->unlock = config->unlock;
426 map->lock_arg = config->lock_arg;
428 if ((bus && bus->fast_io) ||
430 spin_lock_init(&map->spinlock);
431 map->lock = regmap_lock_spinlock;
432 map->unlock = regmap_unlock_spinlock;
434 mutex_init(&map->mutex);
435 map->lock = regmap_lock_mutex;
436 map->unlock = regmap_unlock_mutex;
440 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
441 map->format.pad_bytes = config->pad_bits / 8;
442 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
443 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
444 config->val_bits + config->pad_bits, 8);
445 map->reg_shift = config->pad_bits % 8;
446 if (config->reg_stride)
447 map->reg_stride = config->reg_stride;
450 map->use_single_rw = config->use_single_rw;
453 map->bus_context = bus_context;
454 map->max_register = config->max_register;
455 map->wr_table = config->wr_table;
456 map->rd_table = config->rd_table;
457 map->volatile_table = config->volatile_table;
458 map->precious_table = config->precious_table;
459 map->writeable_reg = config->writeable_reg;
460 map->readable_reg = config->readable_reg;
461 map->volatile_reg = config->volatile_reg;
462 map->precious_reg = config->precious_reg;
463 map->cache_type = config->cache_type;
464 map->name = config->name;
466 spin_lock_init(&map->async_lock);
467 INIT_LIST_HEAD(&map->async_list);
468 init_waitqueue_head(&map->async_waitq);
470 if (config->read_flag_mask || config->write_flag_mask) {
471 map->read_flag_mask = config->read_flag_mask;
472 map->write_flag_mask = config->write_flag_mask;
474 map->read_flag_mask = bus->read_flag_mask;
478 map->reg_read = config->reg_read;
479 map->reg_write = config->reg_write;
481 map->defer_caching = false;
482 goto skip_format_initialization;
484 map->reg_read = _regmap_bus_read;
487 reg_endian = config->reg_format_endian;
488 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
489 reg_endian = bus->reg_format_endian_default;
490 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
491 reg_endian = REGMAP_ENDIAN_BIG;
493 val_endian = config->val_format_endian;
494 if (val_endian == REGMAP_ENDIAN_DEFAULT)
495 val_endian = bus->val_format_endian_default;
496 if (val_endian == REGMAP_ENDIAN_DEFAULT)
497 val_endian = REGMAP_ENDIAN_BIG;
499 switch (config->reg_bits + map->reg_shift) {
501 switch (config->val_bits) {
503 map->format.format_write = regmap_format_2_6_write;
511 switch (config->val_bits) {
513 map->format.format_write = regmap_format_4_12_write;
521 switch (config->val_bits) {
523 map->format.format_write = regmap_format_7_9_write;
531 switch (config->val_bits) {
533 map->format.format_write = regmap_format_10_14_write;
541 map->format.format_reg = regmap_format_8;
545 switch (reg_endian) {
546 case REGMAP_ENDIAN_BIG:
547 map->format.format_reg = regmap_format_16_be;
549 case REGMAP_ENDIAN_NATIVE:
550 map->format.format_reg = regmap_format_16_native;
558 if (reg_endian != REGMAP_ENDIAN_BIG)
560 map->format.format_reg = regmap_format_24;
564 switch (reg_endian) {
565 case REGMAP_ENDIAN_BIG:
566 map->format.format_reg = regmap_format_32_be;
568 case REGMAP_ENDIAN_NATIVE:
569 map->format.format_reg = regmap_format_32_native;
580 if (val_endian == REGMAP_ENDIAN_NATIVE)
581 map->format.parse_inplace = regmap_parse_inplace_noop;
583 switch (config->val_bits) {
585 map->format.format_val = regmap_format_8;
586 map->format.parse_val = regmap_parse_8;
587 map->format.parse_inplace = regmap_parse_inplace_noop;
590 switch (val_endian) {
591 case REGMAP_ENDIAN_BIG:
592 map->format.format_val = regmap_format_16_be;
593 map->format.parse_val = regmap_parse_16_be;
594 map->format.parse_inplace = regmap_parse_16_be_inplace;
596 case REGMAP_ENDIAN_NATIVE:
597 map->format.format_val = regmap_format_16_native;
598 map->format.parse_val = regmap_parse_16_native;
605 if (val_endian != REGMAP_ENDIAN_BIG)
607 map->format.format_val = regmap_format_24;
608 map->format.parse_val = regmap_parse_24;
611 switch (val_endian) {
612 case REGMAP_ENDIAN_BIG:
613 map->format.format_val = regmap_format_32_be;
614 map->format.parse_val = regmap_parse_32_be;
615 map->format.parse_inplace = regmap_parse_32_be_inplace;
617 case REGMAP_ENDIAN_NATIVE:
618 map->format.format_val = regmap_format_32_native;
619 map->format.parse_val = regmap_parse_32_native;
627 if (map->format.format_write) {
628 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
629 (val_endian != REGMAP_ENDIAN_BIG))
631 map->use_single_rw = true;
634 if (!map->format.format_write &&
635 !(map->format.format_reg && map->format.format_val))
638 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
639 if (map->work_buf == NULL) {
644 if (map->format.format_write) {
645 map->defer_caching = false;
646 map->reg_write = _regmap_bus_formatted_write;
647 } else if (map->format.format_val) {
648 map->defer_caching = true;
649 map->reg_write = _regmap_bus_raw_write;
652 skip_format_initialization:
654 map->range_tree = RB_ROOT;
655 for (i = 0; i < config->num_ranges; i++) {
656 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
657 struct regmap_range_node *new;
660 if (range_cfg->range_max < range_cfg->range_min) {
661 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
662 range_cfg->range_max, range_cfg->range_min);
666 if (range_cfg->range_max > map->max_register) {
667 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
668 range_cfg->range_max, map->max_register);
672 if (range_cfg->selector_reg > map->max_register) {
674 "Invalid range %d: selector out of map\n", i);
678 if (range_cfg->window_len == 0) {
679 dev_err(map->dev, "Invalid range %d: window_len 0\n",
684 /* Make sure, that this register range has no selector
685 or data window within its boundary */
686 for (j = 0; j < config->num_ranges; j++) {
687 unsigned sel_reg = config->ranges[j].selector_reg;
688 unsigned win_min = config->ranges[j].window_start;
689 unsigned win_max = win_min +
690 config->ranges[j].window_len - 1;
692 /* Allow data window inside its own virtual range */
696 if (range_cfg->range_min <= sel_reg &&
697 sel_reg <= range_cfg->range_max) {
699 "Range %d: selector for %d in window\n",
704 if (!(win_max < range_cfg->range_min ||
705 win_min > range_cfg->range_max)) {
707 "Range %d: window for %d in window\n",
713 new = kzalloc(sizeof(*new), GFP_KERNEL);
720 new->name = range_cfg->name;
721 new->range_min = range_cfg->range_min;
722 new->range_max = range_cfg->range_max;
723 new->selector_reg = range_cfg->selector_reg;
724 new->selector_mask = range_cfg->selector_mask;
725 new->selector_shift = range_cfg->selector_shift;
726 new->window_start = range_cfg->window_start;
727 new->window_len = range_cfg->window_len;
729 if (_regmap_range_add(map, new) == false) {
730 dev_err(map->dev, "Failed to add range %d\n", i);
735 if (map->selector_work_buf == NULL) {
736 map->selector_work_buf =
737 kzalloc(map->format.buf_size, GFP_KERNEL);
738 if (map->selector_work_buf == NULL) {
745 regmap_debugfs_init(map, config->name);
747 ret = regcache_init(map, config);
751 /* Add a devres resource for dev_get_regmap() */
752 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
763 regmap_debugfs_exit(map);
766 regmap_range_exit(map);
767 kfree(map->work_buf);
773 EXPORT_SYMBOL_GPL(regmap_init);
775 static void devm_regmap_release(struct device *dev, void *res)
777 regmap_exit(*(struct regmap **)res);
781 * devm_regmap_init(): Initialise managed register map
783 * @dev: Device that will be interacted with
784 * @bus: Bus-specific callbacks to use with device
785 * @bus_context: Data passed to bus-specific callbacks
786 * @config: Configuration for register map
788 * The return value will be an ERR_PTR() on error or a valid pointer
789 * to a struct regmap. This function should generally not be called
790 * directly, it should be called by bus-specific init functions. The
791 * map will be automatically freed by the device management code.
793 struct regmap *devm_regmap_init(struct device *dev,
794 const struct regmap_bus *bus,
796 const struct regmap_config *config)
798 struct regmap **ptr, *regmap;
800 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
802 return ERR_PTR(-ENOMEM);
804 regmap = regmap_init(dev, bus, bus_context, config);
805 if (!IS_ERR(regmap)) {
807 devres_add(dev, ptr);
814 EXPORT_SYMBOL_GPL(devm_regmap_init);
816 static void regmap_field_init(struct regmap_field *rm_field,
817 struct regmap *regmap, struct reg_field reg_field)
819 int field_bits = reg_field.msb - reg_field.lsb + 1;
820 rm_field->regmap = regmap;
821 rm_field->reg = reg_field.reg;
822 rm_field->shift = reg_field.lsb;
823 rm_field->mask = ((BIT(field_bits) - 1) << reg_field.lsb);
824 rm_field->id_size = reg_field.id_size;
825 rm_field->id_offset = reg_field.id_offset;
829 * devm_regmap_field_alloc(): Allocate and initialise a register field
832 * @dev: Device that will be interacted with
833 * @regmap: regmap bank in which this register field is located.
834 * @reg_field: Register field with in the bank.
836 * The return value will be an ERR_PTR() on error or a valid pointer
837 * to a struct regmap_field. The regmap_field will be automatically freed
838 * by the device management code.
840 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
841 struct regmap *regmap, struct reg_field reg_field)
843 struct regmap_field *rm_field = devm_kzalloc(dev,
844 sizeof(*rm_field), GFP_KERNEL);
846 return ERR_PTR(-ENOMEM);
848 regmap_field_init(rm_field, regmap, reg_field);
853 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
856 * devm_regmap_field_free(): Free register field allocated using
857 * devm_regmap_field_alloc. Usally drivers need not call this function,
858 * as the memory allocated via devm will be freed as per device-driver
861 * @dev: Device that will be interacted with
862 * @field: regmap field which should be freed.
864 void devm_regmap_field_free(struct device *dev,
865 struct regmap_field *field)
867 devm_kfree(dev, field);
869 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
872 * regmap_field_alloc(): Allocate and initialise a register field
875 * @regmap: regmap bank in which this register field is located.
876 * @reg_field: Register field with in the bank.
878 * The return value will be an ERR_PTR() on error or a valid pointer
879 * to a struct regmap_field. The regmap_field should be freed by the
880 * user once its finished working with it using regmap_field_free().
882 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
883 struct reg_field reg_field)
885 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
888 return ERR_PTR(-ENOMEM);
890 regmap_field_init(rm_field, regmap, reg_field);
894 EXPORT_SYMBOL_GPL(regmap_field_alloc);
897 * regmap_field_free(): Free register field allocated using regmap_field_alloc
899 * @field: regmap field which should be freed.
901 void regmap_field_free(struct regmap_field *field)
905 EXPORT_SYMBOL_GPL(regmap_field_free);
908 * regmap_reinit_cache(): Reinitialise the current register cache
910 * @map: Register map to operate on.
911 * @config: New configuration. Only the cache data will be used.
913 * Discard any existing register cache for the map and initialize a
914 * new cache. This can be used to restore the cache to defaults or to
915 * update the cache configuration to reflect runtime discovery of the
918 * No explicit locking is done here, the user needs to ensure that
919 * this function will not race with other calls to regmap.
921 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
924 regmap_debugfs_exit(map);
926 map->max_register = config->max_register;
927 map->writeable_reg = config->writeable_reg;
928 map->readable_reg = config->readable_reg;
929 map->volatile_reg = config->volatile_reg;
930 map->precious_reg = config->precious_reg;
931 map->cache_type = config->cache_type;
933 regmap_debugfs_init(map, config->name);
935 map->cache_bypass = false;
936 map->cache_only = false;
938 return regcache_init(map, config);
940 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
943 * regmap_exit(): Free a previously allocated register map
945 void regmap_exit(struct regmap *map)
948 regmap_debugfs_exit(map);
949 regmap_range_exit(map);
950 if (map->bus && map->bus->free_context)
951 map->bus->free_context(map->bus_context);
952 kfree(map->work_buf);
955 EXPORT_SYMBOL_GPL(regmap_exit);
957 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
959 struct regmap **r = res;
965 /* If the user didn't specify a name match any */
967 return (*r)->name == data;
973 * dev_get_regmap(): Obtain the regmap (if any) for a device
975 * @dev: Device to retrieve the map for
976 * @name: Optional name for the register map, usually NULL.
978 * Returns the regmap for the device if one is present, or NULL. If
979 * name is specified then it must match the name specified when
980 * registering the device, if it is NULL then the first regmap found
981 * will be used. Devices with multiple register maps are very rare,
982 * generic code should normally not need to specify a name.
984 struct regmap *dev_get_regmap(struct device *dev, const char *name)
986 struct regmap **r = devres_find(dev, dev_get_regmap_release,
987 dev_get_regmap_match, (void *)name);
993 EXPORT_SYMBOL_GPL(dev_get_regmap);
995 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
996 struct regmap_range_node *range,
997 unsigned int val_num)
1000 unsigned int win_offset;
1001 unsigned int win_page;
1005 win_offset = (*reg - range->range_min) % range->window_len;
1006 win_page = (*reg - range->range_min) / range->window_len;
1009 /* Bulk write shouldn't cross range boundary */
1010 if (*reg + val_num - 1 > range->range_max)
1013 /* ... or single page boundary */
1014 if (val_num > range->window_len - win_offset)
1018 /* It is possible to have selector register inside data window.
1019 In that case, selector register is located on every page and
1020 it needs no page switching, when accessed alone. */
1022 range->window_start + win_offset != range->selector_reg) {
1023 /* Use separate work_buf during page switching */
1024 orig_work_buf = map->work_buf;
1025 map->work_buf = map->selector_work_buf;
1027 ret = _regmap_update_bits(map, range->selector_reg,
1028 range->selector_mask,
1029 win_page << range->selector_shift,
1032 map->work_buf = orig_work_buf;
1038 *reg = range->window_start + win_offset;
1043 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1044 const void *val, size_t val_len, bool async)
1046 struct regmap_range_node *range;
1047 unsigned long flags;
1048 u8 *u8 = map->work_buf;
1049 void *work_val = map->work_buf + map->format.reg_bytes +
1050 map->format.pad_bytes;
1052 int ret = -ENOTSUPP;
1058 /* Check for unwritable registers before we start */
1059 if (map->writeable_reg)
1060 for (i = 0; i < val_len / map->format.val_bytes; i++)
1061 if (!map->writeable_reg(map->dev,
1062 reg + (i * map->reg_stride)))
1065 if (!map->cache_bypass && map->format.parse_val) {
1067 int val_bytes = map->format.val_bytes;
1068 for (i = 0; i < val_len / val_bytes; i++) {
1069 ival = map->format.parse_val(val + (i * val_bytes));
1070 ret = regcache_write(map, reg + (i * map->reg_stride),
1074 "Error in caching of register: %x ret: %d\n",
1079 if (map->cache_only) {
1080 map->cache_dirty = true;
1085 range = _regmap_range_lookup(map, reg);
1087 int val_num = val_len / map->format.val_bytes;
1088 int win_offset = (reg - range->range_min) % range->window_len;
1089 int win_residue = range->window_len - win_offset;
1091 /* If the write goes beyond the end of the window split it */
1092 while (val_num > win_residue) {
1093 dev_dbg(map->dev, "Writing window %d/%zu\n",
1094 win_residue, val_len / map->format.val_bytes);
1095 ret = _regmap_raw_write(map, reg, val, win_residue *
1096 map->format.val_bytes, async);
1101 val_num -= win_residue;
1102 val += win_residue * map->format.val_bytes;
1103 val_len -= win_residue * map->format.val_bytes;
1105 win_offset = (reg - range->range_min) %
1107 win_residue = range->window_len - win_offset;
1110 ret = _regmap_select_page(map, ®, range, val_num);
1115 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1117 u8[0] |= map->write_flag_mask;
1119 if (async && map->bus->async_write) {
1120 struct regmap_async *async = map->bus->async_alloc();
1124 trace_regmap_async_write_start(map->dev, reg, val_len);
1126 async->work_buf = kzalloc(map->format.buf_size,
1127 GFP_KERNEL | GFP_DMA);
1128 if (!async->work_buf) {
1133 INIT_WORK(&async->cleanup, async_cleanup);
1136 /* If the caller supplied the value we can use it safely. */
1137 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1138 map->format.reg_bytes + map->format.val_bytes);
1139 if (val == work_val)
1140 val = async->work_buf + map->format.pad_bytes +
1141 map->format.reg_bytes;
1143 spin_lock_irqsave(&map->async_lock, flags);
1144 list_add_tail(&async->list, &map->async_list);
1145 spin_unlock_irqrestore(&map->async_lock, flags);
1147 ret = map->bus->async_write(map->bus_context, async->work_buf,
1148 map->format.reg_bytes +
1149 map->format.pad_bytes,
1150 val, val_len, async);
1153 dev_err(map->dev, "Failed to schedule write: %d\n",
1156 spin_lock_irqsave(&map->async_lock, flags);
1157 list_del(&async->list);
1158 spin_unlock_irqrestore(&map->async_lock, flags);
1160 kfree(async->work_buf);
1167 trace_regmap_hw_write_start(map->dev, reg,
1168 val_len / map->format.val_bytes);
1170 /* If we're doing a single register write we can probably just
1171 * send the work_buf directly, otherwise try to do a gather
1174 if (val == work_val)
1175 ret = map->bus->write(map->bus_context, map->work_buf,
1176 map->format.reg_bytes +
1177 map->format.pad_bytes +
1179 else if (map->bus->gather_write)
1180 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1181 map->format.reg_bytes +
1182 map->format.pad_bytes,
1185 /* If that didn't work fall back on linearising by hand. */
1186 if (ret == -ENOTSUPP) {
1187 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1188 buf = kzalloc(len, GFP_KERNEL);
1192 memcpy(buf, map->work_buf, map->format.reg_bytes);
1193 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1195 ret = map->bus->write(map->bus_context, buf, len);
1200 trace_regmap_hw_write_done(map->dev, reg,
1201 val_len / map->format.val_bytes);
1207 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1209 * @map: Map to check.
1211 bool regmap_can_raw_write(struct regmap *map)
1213 return map->bus && map->format.format_val && map->format.format_reg;
1215 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1217 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1221 struct regmap_range_node *range;
1222 struct regmap *map = context;
1224 WARN_ON(!map->bus || !map->format.format_write);
1226 range = _regmap_range_lookup(map, reg);
1228 ret = _regmap_select_page(map, ®, range, 1);
1233 map->format.format_write(map, reg, val);
1235 trace_regmap_hw_write_start(map->dev, reg, 1);
1237 ret = map->bus->write(map->bus_context, map->work_buf,
1238 map->format.buf_size);
1240 trace_regmap_hw_write_done(map->dev, reg, 1);
1245 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1248 struct regmap *map = context;
1250 WARN_ON(!map->bus || !map->format.format_val);
1252 map->format.format_val(map->work_buf + map->format.reg_bytes
1253 + map->format.pad_bytes, val, 0);
1254 return _regmap_raw_write(map, reg,
1256 map->format.reg_bytes +
1257 map->format.pad_bytes,
1258 map->format.val_bytes, false);
1261 static inline void *_regmap_map_get_context(struct regmap *map)
1263 return (map->bus) ? map : map->bus_context;
1266 int _regmap_write(struct regmap *map, unsigned int reg,
1270 void *context = _regmap_map_get_context(map);
1272 if (!regmap_writeable(map, reg))
1275 if (!map->cache_bypass && !map->defer_caching) {
1276 ret = regcache_write(map, reg, val);
1279 if (map->cache_only) {
1280 map->cache_dirty = true;
1286 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1287 dev_info(map->dev, "%x <= %x\n", reg, val);
1290 trace_regmap_reg_write(map->dev, reg, val);
1292 return map->reg_write(context, reg, val);
1296 * regmap_write(): Write a value to a single register
1298 * @map: Register map to write to
1299 * @reg: Register to write to
1300 * @val: Value to be written
1302 * A value of zero will be returned on success, a negative errno will
1303 * be returned in error cases.
1305 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1309 if (reg % map->reg_stride)
1312 map->lock(map->lock_arg);
1314 ret = _regmap_write(map, reg, val);
1316 map->unlock(map->lock_arg);
1320 EXPORT_SYMBOL_GPL(regmap_write);
1323 * regmap_raw_write(): Write raw values to one or more registers
1325 * @map: Register map to write to
1326 * @reg: Initial register to write to
1327 * @val: Block of data to be written, laid out for direct transmission to the
1329 * @val_len: Length of data pointed to by val.
1331 * This function is intended to be used for things like firmware
1332 * download where a large block of data needs to be transferred to the
1333 * device. No formatting will be done on the data provided.
1335 * A value of zero will be returned on success, a negative errno will
1336 * be returned in error cases.
1338 int regmap_raw_write(struct regmap *map, unsigned int reg,
1339 const void *val, size_t val_len)
1343 if (!regmap_can_raw_write(map))
1345 if (val_len % map->format.val_bytes)
1348 map->lock(map->lock_arg);
1350 ret = _regmap_raw_write(map, reg, val, val_len, false);
1352 map->unlock(map->lock_arg);
1356 EXPORT_SYMBOL_GPL(regmap_raw_write);
1359 * regmap_field_write(): Write a value to a single register field
1361 * @field: Register field to write to
1362 * @val: Value to be written
1364 * A value of zero will be returned on success, a negative errno will
1365 * be returned in error cases.
1367 int regmap_field_write(struct regmap_field *field, unsigned int val)
1369 return regmap_update_bits(field->regmap, field->reg,
1370 field->mask, val << field->shift);
1372 EXPORT_SYMBOL_GPL(regmap_field_write);
1375 * regmap_field_update_bits(): Perform a read/modify/write cycle
1376 * on the register field
1378 * @field: Register field to write to
1379 * @mask: Bitmask to change
1380 * @val: Value to be written
1382 * A value of zero will be returned on success, a negative errno will
1383 * be returned in error cases.
1385 int regmap_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
1387 mask = (mask << field->shift) & field->mask;
1389 return regmap_update_bits(field->regmap, field->reg,
1390 mask, val << field->shift);
1392 EXPORT_SYMBOL_GPL(regmap_field_update_bits);
1395 * regmap_fields_write(): Write a value to a single register field with port ID
1397 * @field: Register field to write to
1399 * @val: Value to be written
1401 * A value of zero will be returned on success, a negative errno will
1402 * be returned in error cases.
1404 int regmap_fields_write(struct regmap_field *field, unsigned int id,
1407 if (id >= field->id_size)
1410 return regmap_update_bits(field->regmap,
1411 field->reg + (field->id_offset * id),
1412 field->mask, val << field->shift);
1414 EXPORT_SYMBOL_GPL(regmap_fields_write);
1417 * regmap_fields_update_bits(): Perform a read/modify/write cycle
1418 * on the register field
1420 * @field: Register field to write to
1422 * @mask: Bitmask to change
1423 * @val: Value to be written
1425 * A value of zero will be returned on success, a negative errno will
1426 * be returned in error cases.
1428 int regmap_fields_update_bits(struct regmap_field *field, unsigned int id,
1429 unsigned int mask, unsigned int val)
1431 if (id >= field->id_size)
1434 mask = (mask << field->shift) & field->mask;
1436 return regmap_update_bits(field->regmap,
1437 field->reg + (field->id_offset * id),
1438 mask, val << field->shift);
1440 EXPORT_SYMBOL_GPL(regmap_fields_update_bits);
1443 * regmap_bulk_write(): Write multiple registers to the device
1445 * @map: Register map to write to
1446 * @reg: First register to be write from
1447 * @val: Block of data to be written, in native register size for device
1448 * @val_count: Number of registers to write
1450 * This function is intended to be used for writing a large block of
1451 * data to the device either in single transfer or multiple transfer.
1453 * A value of zero will be returned on success, a negative errno will
1454 * be returned in error cases.
1456 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1460 size_t val_bytes = map->format.val_bytes;
1465 if (!map->format.parse_inplace)
1467 if (reg % map->reg_stride)
1470 map->lock(map->lock_arg);
1472 /* No formatting is require if val_byte is 1 */
1473 if (val_bytes == 1) {
1476 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
1479 dev_err(map->dev, "Error in memory allocation\n");
1482 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1483 map->format.parse_inplace(wval + i);
1486 * Some devices does not support bulk write, for
1487 * them we have a series of single write operations.
1489 if (map->use_single_rw) {
1490 for (i = 0; i < val_count; i++) {
1491 ret = regmap_raw_write(map,
1492 reg + (i * map->reg_stride),
1493 val + (i * val_bytes),
1499 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count,
1507 map->unlock(map->lock_arg);
1510 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1513 * regmap_raw_write_async(): Write raw values to one or more registers
1516 * @map: Register map to write to
1517 * @reg: Initial register to write to
1518 * @val: Block of data to be written, laid out for direct transmission to the
1519 * device. Must be valid until regmap_async_complete() is called.
1520 * @val_len: Length of data pointed to by val.
1522 * This function is intended to be used for things like firmware
1523 * download where a large block of data needs to be transferred to the
1524 * device. No formatting will be done on the data provided.
1526 * If supported by the underlying bus the write will be scheduled
1527 * asynchronously, helping maximise I/O speed on higher speed buses
1528 * like SPI. regmap_async_complete() can be called to ensure that all
1529 * asynchrnous writes have been completed.
1531 * A value of zero will be returned on success, a negative errno will
1532 * be returned in error cases.
1534 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
1535 const void *val, size_t val_len)
1539 if (val_len % map->format.val_bytes)
1541 if (reg % map->reg_stride)
1544 map->lock(map->lock_arg);
1546 ret = _regmap_raw_write(map, reg, val, val_len, true);
1548 map->unlock(map->lock_arg);
1552 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
1554 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1555 unsigned int val_len)
1557 struct regmap_range_node *range;
1558 u8 *u8 = map->work_buf;
1563 range = _regmap_range_lookup(map, reg);
1565 ret = _regmap_select_page(map, ®, range,
1566 val_len / map->format.val_bytes);
1571 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1574 * Some buses or devices flag reads by setting the high bits in the
1575 * register addresss; since it's always the high bits for all
1576 * current formats we can do this here rather than in
1577 * formatting. This may break if we get interesting formats.
1579 u8[0] |= map->read_flag_mask;
1581 trace_regmap_hw_read_start(map->dev, reg,
1582 val_len / map->format.val_bytes);
1584 ret = map->bus->read(map->bus_context, map->work_buf,
1585 map->format.reg_bytes + map->format.pad_bytes,
1588 trace_regmap_hw_read_done(map->dev, reg,
1589 val_len / map->format.val_bytes);
1594 static int _regmap_bus_read(void *context, unsigned int reg,
1598 struct regmap *map = context;
1600 if (!map->format.parse_val)
1603 ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
1605 *val = map->format.parse_val(map->work_buf);
1610 static int _regmap_read(struct regmap *map, unsigned int reg,
1614 void *context = _regmap_map_get_context(map);
1616 WARN_ON(!map->reg_read);
1618 if (!map->cache_bypass) {
1619 ret = regcache_read(map, reg, val);
1624 if (map->cache_only)
1627 ret = map->reg_read(context, reg, val);
1630 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1631 dev_info(map->dev, "%x => %x\n", reg, *val);
1634 trace_regmap_reg_read(map->dev, reg, *val);
1636 if (!map->cache_bypass)
1637 regcache_write(map, reg, *val);
1644 * regmap_read(): Read a value from a single register
1646 * @map: Register map to write to
1647 * @reg: Register to be read from
1648 * @val: Pointer to store read value
1650 * A value of zero will be returned on success, a negative errno will
1651 * be returned in error cases.
1653 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
1657 if (reg % map->reg_stride)
1660 map->lock(map->lock_arg);
1662 ret = _regmap_read(map, reg, val);
1664 map->unlock(map->lock_arg);
1668 EXPORT_SYMBOL_GPL(regmap_read);
1671 * regmap_raw_read(): Read raw data from the device
1673 * @map: Register map to write to
1674 * @reg: First register to be read from
1675 * @val: Pointer to store read value
1676 * @val_len: Size of data to read
1678 * A value of zero will be returned on success, a negative errno will
1679 * be returned in error cases.
1681 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1684 size_t val_bytes = map->format.val_bytes;
1685 size_t val_count = val_len / val_bytes;
1691 if (val_len % map->format.val_bytes)
1693 if (reg % map->reg_stride)
1696 map->lock(map->lock_arg);
1698 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
1699 map->cache_type == REGCACHE_NONE) {
1700 /* Physical block read if there's no cache involved */
1701 ret = _regmap_raw_read(map, reg, val, val_len);
1704 /* Otherwise go word by word for the cache; should be low
1705 * cost as we expect to hit the cache.
1707 for (i = 0; i < val_count; i++) {
1708 ret = _regmap_read(map, reg + (i * map->reg_stride),
1713 map->format.format_val(val + (i * val_bytes), v, 0);
1718 map->unlock(map->lock_arg);
1722 EXPORT_SYMBOL_GPL(regmap_raw_read);
1725 * regmap_field_read(): Read a value to a single register field
1727 * @field: Register field to read from
1728 * @val: Pointer to store read value
1730 * A value of zero will be returned on success, a negative errno will
1731 * be returned in error cases.
1733 int regmap_field_read(struct regmap_field *field, unsigned int *val)
1736 unsigned int reg_val;
1737 ret = regmap_read(field->regmap, field->reg, ®_val);
1741 reg_val &= field->mask;
1742 reg_val >>= field->shift;
1747 EXPORT_SYMBOL_GPL(regmap_field_read);
1750 * regmap_fields_read(): Read a value to a single register field with port ID
1752 * @field: Register field to read from
1754 * @val: Pointer to store read value
1756 * A value of zero will be returned on success, a negative errno will
1757 * be returned in error cases.
1759 int regmap_fields_read(struct regmap_field *field, unsigned int id,
1763 unsigned int reg_val;
1765 if (id >= field->id_size)
1768 ret = regmap_read(field->regmap,
1769 field->reg + (field->id_offset * id),
1774 reg_val &= field->mask;
1775 reg_val >>= field->shift;
1780 EXPORT_SYMBOL_GPL(regmap_fields_read);
1783 * regmap_bulk_read(): Read multiple registers from the device
1785 * @map: Register map to write to
1786 * @reg: First register to be read from
1787 * @val: Pointer to store read value, in native register size for device
1788 * @val_count: Number of registers to read
1790 * A value of zero will be returned on success, a negative errno will
1791 * be returned in error cases.
1793 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
1797 size_t val_bytes = map->format.val_bytes;
1798 bool vol = regmap_volatile_range(map, reg, val_count);
1802 if (!map->format.parse_inplace)
1804 if (reg % map->reg_stride)
1807 if (vol || map->cache_type == REGCACHE_NONE) {
1809 * Some devices does not support bulk read, for
1810 * them we have a series of single read operations.
1812 if (map->use_single_rw) {
1813 for (i = 0; i < val_count; i++) {
1814 ret = regmap_raw_read(map,
1815 reg + (i * map->reg_stride),
1816 val + (i * val_bytes),
1822 ret = regmap_raw_read(map, reg, val,
1823 val_bytes * val_count);
1828 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1829 map->format.parse_inplace(val + i);
1831 for (i = 0; i < val_count; i++) {
1833 ret = regmap_read(map, reg + (i * map->reg_stride),
1837 memcpy(val + (i * val_bytes), &ival, val_bytes);
1843 EXPORT_SYMBOL_GPL(regmap_bulk_read);
1845 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
1846 unsigned int mask, unsigned int val,
1850 unsigned int tmp, orig;
1852 ret = _regmap_read(map, reg, &orig);
1860 ret = _regmap_write(map, reg, tmp);
1870 * regmap_update_bits: Perform a read/modify/write cycle on the register map
1872 * @map: Register map to update
1873 * @reg: Register to update
1874 * @mask: Bitmask to change
1875 * @val: New value for bitmask
1877 * Returns zero for success, a negative number on error.
1879 int regmap_update_bits(struct regmap *map, unsigned int reg,
1880 unsigned int mask, unsigned int val)
1885 map->lock(map->lock_arg);
1886 ret = _regmap_update_bits(map, reg, mask, val, &change);
1887 map->unlock(map->lock_arg);
1891 EXPORT_SYMBOL_GPL(regmap_update_bits);
1894 * regmap_update_bits_check: Perform a read/modify/write cycle on the
1895 * register map and report if updated
1897 * @map: Register map to update
1898 * @reg: Register to update
1899 * @mask: Bitmask to change
1900 * @val: New value for bitmask
1901 * @change: Boolean indicating if a write was done
1903 * Returns zero for success, a negative number on error.
1905 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
1906 unsigned int mask, unsigned int val,
1911 map->lock(map->lock_arg);
1912 ret = _regmap_update_bits(map, reg, mask, val, change);
1913 map->unlock(map->lock_arg);
1916 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
1918 void regmap_async_complete_cb(struct regmap_async *async, int ret)
1920 struct regmap *map = async->map;
1923 trace_regmap_async_io_complete(map->dev);
1925 spin_lock(&map->async_lock);
1927 list_del(&async->list);
1928 wake = list_empty(&map->async_list);
1931 map->async_ret = ret;
1933 spin_unlock(&map->async_lock);
1935 schedule_work(&async->cleanup);
1938 wake_up(&map->async_waitq);
1940 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
1942 static int regmap_async_is_done(struct regmap *map)
1944 unsigned long flags;
1947 spin_lock_irqsave(&map->async_lock, flags);
1948 ret = list_empty(&map->async_list);
1949 spin_unlock_irqrestore(&map->async_lock, flags);
1955 * regmap_async_complete: Ensure all asynchronous I/O has completed.
1957 * @map: Map to operate on.
1959 * Blocks until any pending asynchronous I/O has completed. Returns
1960 * an error code for any failed I/O operations.
1962 int regmap_async_complete(struct regmap *map)
1964 unsigned long flags;
1967 /* Nothing to do with no async support */
1968 if (!map->bus || !map->bus->async_write)
1971 trace_regmap_async_complete_start(map->dev);
1973 wait_event(map->async_waitq, regmap_async_is_done(map));
1975 spin_lock_irqsave(&map->async_lock, flags);
1976 ret = map->async_ret;
1978 spin_unlock_irqrestore(&map->async_lock, flags);
1980 trace_regmap_async_complete_done(map->dev);
1984 EXPORT_SYMBOL_GPL(regmap_async_complete);
1987 * regmap_register_patch: Register and apply register updates to be applied
1988 * on device initialistion
1990 * @map: Register map to apply updates to.
1991 * @regs: Values to update.
1992 * @num_regs: Number of entries in regs.
1994 * Register a set of register updates to be applied to the device
1995 * whenever the device registers are synchronised with the cache and
1996 * apply them immediately. Typically this is used to apply
1997 * corrections to be applied to the device defaults on startup, such
1998 * as the updates some vendors provide to undocumented registers.
2000 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
2003 struct reg_default *p;
2007 map->lock(map->lock_arg);
2009 bypass = map->cache_bypass;
2011 map->cache_bypass = true;
2013 /* Write out first; it's useful to apply even if we fail later. */
2014 for (i = 0; i < num_regs; i++) {
2015 ret = _regmap_write(map, regs[i].reg, regs[i].def);
2017 dev_err(map->dev, "Failed to write %x = %x: %d\n",
2018 regs[i].reg, regs[i].def, ret);
2023 p = krealloc(map->patch,
2024 sizeof(struct reg_default) * (map->patch_regs + num_regs),
2027 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2029 map->patch_regs += num_regs;
2035 map->cache_bypass = bypass;
2037 map->unlock(map->lock_arg);
2041 EXPORT_SYMBOL_GPL(regmap_register_patch);
2044 * regmap_get_val_bytes(): Report the size of a register value
2046 * Report the size of a register value, mainly intended to for use by
2047 * generic infrastructure built on top of regmap.
2049 int regmap_get_val_bytes(struct regmap *map)
2051 if (map->format.format_write)
2054 return map->format.val_bytes;
2056 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2058 static int __init regmap_initcall(void)
2060 regmap_debugfs_initcall();
2064 postcore_initcall(regmap_initcall);