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 bool regmap_reg_in_ranges(unsigned int reg,
46 const struct regmap_range *ranges,
49 const struct regmap_range *r;
52 for (i = 0, r = ranges; i < nranges; i++, r++)
53 if (regmap_reg_in_range(reg, r))
57 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
59 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
60 const struct regmap_access_table *table)
62 /* Check "no ranges" first */
63 if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
66 /* In case zero "yes ranges" are supplied, any reg is OK */
67 if (!table->n_yes_ranges)
70 return regmap_reg_in_ranges(reg, table->yes_ranges,
73 EXPORT_SYMBOL_GPL(regmap_check_range_table);
75 bool regmap_writeable(struct regmap *map, unsigned int reg)
77 if (map->max_register && reg > map->max_register)
80 if (map->writeable_reg)
81 return map->writeable_reg(map->dev, reg);
84 return regmap_check_range_table(map, reg, map->wr_table);
89 bool regmap_readable(struct regmap *map, unsigned int reg)
91 if (map->max_register && reg > map->max_register)
94 if (map->format.format_write)
97 if (map->readable_reg)
98 return map->readable_reg(map->dev, reg);
101 return regmap_check_range_table(map, reg, map->rd_table);
106 bool regmap_volatile(struct regmap *map, unsigned int reg)
108 if (!regmap_readable(map, reg))
111 if (map->volatile_reg)
112 return map->volatile_reg(map->dev, reg);
114 if (map->volatile_table)
115 return regmap_check_range_table(map, reg, map->volatile_table);
123 bool regmap_precious(struct regmap *map, unsigned int reg)
125 if (!regmap_readable(map, reg))
128 if (map->precious_reg)
129 return map->precious_reg(map->dev, reg);
131 if (map->precious_table)
132 return regmap_check_range_table(map, reg, map->precious_table);
137 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
142 for (i = 0; i < num; i++)
143 if (!regmap_volatile(map, reg + i))
149 static void regmap_format_2_6_write(struct regmap *map,
150 unsigned int reg, unsigned int val)
152 u8 *out = map->work_buf;
154 *out = (reg << 6) | val;
157 static void regmap_format_4_12_write(struct regmap *map,
158 unsigned int reg, unsigned int val)
160 __be16 *out = map->work_buf;
161 *out = cpu_to_be16((reg << 12) | val);
164 static void regmap_format_7_9_write(struct regmap *map,
165 unsigned int reg, unsigned int val)
167 __be16 *out = map->work_buf;
168 *out = cpu_to_be16((reg << 9) | val);
171 static void regmap_format_10_14_write(struct regmap *map,
172 unsigned int reg, unsigned int val)
174 u8 *out = map->work_buf;
177 out[1] = (val >> 8) | (reg << 6);
181 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
188 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
192 b[0] = cpu_to_be16(val << shift);
195 static void regmap_format_16_native(void *buf, unsigned int val,
198 *(u16 *)buf = val << shift;
201 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
212 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
216 b[0] = cpu_to_be32(val << shift);
219 static void regmap_format_32_native(void *buf, unsigned int val,
222 *(u32 *)buf = val << shift;
225 static void regmap_parse_inplace_noop(void *buf)
229 static unsigned int regmap_parse_8(const void *buf)
236 static unsigned int regmap_parse_16_be(const void *buf)
238 const __be16 *b = buf;
240 return be16_to_cpu(b[0]);
243 static void regmap_parse_16_be_inplace(void *buf)
247 b[0] = be16_to_cpu(b[0]);
250 static unsigned int regmap_parse_16_native(const void *buf)
255 static unsigned int regmap_parse_24(const void *buf)
258 unsigned int ret = b[2];
259 ret |= ((unsigned int)b[1]) << 8;
260 ret |= ((unsigned int)b[0]) << 16;
265 static unsigned int regmap_parse_32_be(const void *buf)
267 const __be32 *b = buf;
269 return be32_to_cpu(b[0]);
272 static void regmap_parse_32_be_inplace(void *buf)
276 b[0] = be32_to_cpu(b[0]);
279 static unsigned int regmap_parse_32_native(const void *buf)
284 static void regmap_lock_mutex(void *__map)
286 struct regmap *map = __map;
287 mutex_lock(&map->mutex);
290 static void regmap_unlock_mutex(void *__map)
292 struct regmap *map = __map;
293 mutex_unlock(&map->mutex);
296 static void regmap_lock_spinlock(void *__map)
297 __acquires(&map->spinlock)
299 struct regmap *map = __map;
302 spin_lock_irqsave(&map->spinlock, flags);
303 map->spinlock_flags = flags;
306 static void regmap_unlock_spinlock(void *__map)
307 __releases(&map->spinlock)
309 struct regmap *map = __map;
310 spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
313 static void dev_get_regmap_release(struct device *dev, void *res)
316 * We don't actually have anything to do here; the goal here
317 * is not to manage the regmap but to provide a simple way to
318 * get the regmap back given a struct device.
322 static bool _regmap_range_add(struct regmap *map,
323 struct regmap_range_node *data)
325 struct rb_root *root = &map->range_tree;
326 struct rb_node **new = &(root->rb_node), *parent = NULL;
329 struct regmap_range_node *this =
330 container_of(*new, struct regmap_range_node, node);
333 if (data->range_max < this->range_min)
334 new = &((*new)->rb_left);
335 else if (data->range_min > this->range_max)
336 new = &((*new)->rb_right);
341 rb_link_node(&data->node, parent, new);
342 rb_insert_color(&data->node, root);
347 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
350 struct rb_node *node = map->range_tree.rb_node;
353 struct regmap_range_node *this =
354 container_of(node, struct regmap_range_node, node);
356 if (reg < this->range_min)
357 node = node->rb_left;
358 else if (reg > this->range_max)
359 node = node->rb_right;
367 static void regmap_range_exit(struct regmap *map)
369 struct rb_node *next;
370 struct regmap_range_node *range_node;
372 next = rb_first(&map->range_tree);
374 range_node = rb_entry(next, struct regmap_range_node, node);
375 next = rb_next(&range_node->node);
376 rb_erase(&range_node->node, &map->range_tree);
380 kfree(map->selector_work_buf);
383 int regmap_attach_dev(struct device *dev, struct regmap *map,
384 const struct regmap_config *config)
390 regmap_debugfs_init(map, config->name);
392 /* Add a devres resource for dev_get_regmap() */
393 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
395 regmap_debugfs_exit(map);
403 EXPORT_SYMBOL_GPL(regmap_attach_dev);
406 * regmap_init(): Initialise register map
408 * @dev: Device that will be interacted with
409 * @bus: Bus-specific callbacks to use with device
410 * @bus_context: Data passed to bus-specific callbacks
411 * @config: Configuration for register map
413 * The return value will be an ERR_PTR() on error or a valid pointer to
414 * a struct regmap. This function should generally not be called
415 * directly, it should be called by bus-specific init functions.
417 struct regmap *regmap_init(struct device *dev,
418 const struct regmap_bus *bus,
420 const struct regmap_config *config)
424 enum regmap_endian reg_endian, val_endian;
430 map = kzalloc(sizeof(*map), GFP_KERNEL);
436 if (config->lock && config->unlock) {
437 map->lock = config->lock;
438 map->unlock = config->unlock;
439 map->lock_arg = config->lock_arg;
441 if ((bus && bus->fast_io) ||
443 spin_lock_init(&map->spinlock);
444 map->lock = regmap_lock_spinlock;
445 map->unlock = regmap_unlock_spinlock;
447 mutex_init(&map->mutex);
448 map->lock = regmap_lock_mutex;
449 map->unlock = regmap_unlock_mutex;
453 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
454 map->format.pad_bytes = config->pad_bits / 8;
455 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
456 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
457 config->val_bits + config->pad_bits, 8);
458 map->reg_shift = config->pad_bits % 8;
459 if (config->reg_stride)
460 map->reg_stride = config->reg_stride;
463 map->use_single_rw = config->use_single_rw;
464 map->can_multi_write = config->can_multi_write;
467 map->bus_context = bus_context;
468 map->max_register = config->max_register;
469 map->wr_table = config->wr_table;
470 map->rd_table = config->rd_table;
471 map->volatile_table = config->volatile_table;
472 map->precious_table = config->precious_table;
473 map->writeable_reg = config->writeable_reg;
474 map->readable_reg = config->readable_reg;
475 map->volatile_reg = config->volatile_reg;
476 map->precious_reg = config->precious_reg;
477 map->cache_type = config->cache_type;
478 map->name = config->name;
480 spin_lock_init(&map->async_lock);
481 INIT_LIST_HEAD(&map->async_list);
482 INIT_LIST_HEAD(&map->async_free);
483 init_waitqueue_head(&map->async_waitq);
485 if (config->read_flag_mask || config->write_flag_mask) {
486 map->read_flag_mask = config->read_flag_mask;
487 map->write_flag_mask = config->write_flag_mask;
489 map->read_flag_mask = bus->read_flag_mask;
493 map->reg_read = config->reg_read;
494 map->reg_write = config->reg_write;
496 map->defer_caching = false;
497 goto skip_format_initialization;
499 map->reg_read = _regmap_bus_read;
502 reg_endian = config->reg_format_endian;
503 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
504 reg_endian = bus->reg_format_endian_default;
505 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
506 reg_endian = REGMAP_ENDIAN_BIG;
508 val_endian = config->val_format_endian;
509 if (val_endian == REGMAP_ENDIAN_DEFAULT)
510 val_endian = bus->val_format_endian_default;
511 if (val_endian == REGMAP_ENDIAN_DEFAULT)
512 val_endian = REGMAP_ENDIAN_BIG;
514 switch (config->reg_bits + map->reg_shift) {
516 switch (config->val_bits) {
518 map->format.format_write = regmap_format_2_6_write;
526 switch (config->val_bits) {
528 map->format.format_write = regmap_format_4_12_write;
536 switch (config->val_bits) {
538 map->format.format_write = regmap_format_7_9_write;
546 switch (config->val_bits) {
548 map->format.format_write = regmap_format_10_14_write;
556 map->format.format_reg = regmap_format_8;
560 switch (reg_endian) {
561 case REGMAP_ENDIAN_BIG:
562 map->format.format_reg = regmap_format_16_be;
564 case REGMAP_ENDIAN_NATIVE:
565 map->format.format_reg = regmap_format_16_native;
573 if (reg_endian != REGMAP_ENDIAN_BIG)
575 map->format.format_reg = regmap_format_24;
579 switch (reg_endian) {
580 case REGMAP_ENDIAN_BIG:
581 map->format.format_reg = regmap_format_32_be;
583 case REGMAP_ENDIAN_NATIVE:
584 map->format.format_reg = regmap_format_32_native;
595 if (val_endian == REGMAP_ENDIAN_NATIVE)
596 map->format.parse_inplace = regmap_parse_inplace_noop;
598 switch (config->val_bits) {
600 map->format.format_val = regmap_format_8;
601 map->format.parse_val = regmap_parse_8;
602 map->format.parse_inplace = regmap_parse_inplace_noop;
605 switch (val_endian) {
606 case REGMAP_ENDIAN_BIG:
607 map->format.format_val = regmap_format_16_be;
608 map->format.parse_val = regmap_parse_16_be;
609 map->format.parse_inplace = regmap_parse_16_be_inplace;
611 case REGMAP_ENDIAN_NATIVE:
612 map->format.format_val = regmap_format_16_native;
613 map->format.parse_val = regmap_parse_16_native;
620 if (val_endian != REGMAP_ENDIAN_BIG)
622 map->format.format_val = regmap_format_24;
623 map->format.parse_val = regmap_parse_24;
626 switch (val_endian) {
627 case REGMAP_ENDIAN_BIG:
628 map->format.format_val = regmap_format_32_be;
629 map->format.parse_val = regmap_parse_32_be;
630 map->format.parse_inplace = regmap_parse_32_be_inplace;
632 case REGMAP_ENDIAN_NATIVE:
633 map->format.format_val = regmap_format_32_native;
634 map->format.parse_val = regmap_parse_32_native;
642 if (map->format.format_write) {
643 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
644 (val_endian != REGMAP_ENDIAN_BIG))
646 map->use_single_rw = true;
649 if (!map->format.format_write &&
650 !(map->format.format_reg && map->format.format_val))
653 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
654 if (map->work_buf == NULL) {
659 if (map->format.format_write) {
660 map->defer_caching = false;
661 map->reg_write = _regmap_bus_formatted_write;
662 } else if (map->format.format_val) {
663 map->defer_caching = true;
664 map->reg_write = _regmap_bus_raw_write;
667 skip_format_initialization:
669 map->range_tree = RB_ROOT;
670 for (i = 0; i < config->num_ranges; i++) {
671 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
672 struct regmap_range_node *new;
675 if (range_cfg->range_max < range_cfg->range_min) {
676 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
677 range_cfg->range_max, range_cfg->range_min);
681 if (range_cfg->range_max > map->max_register) {
682 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
683 range_cfg->range_max, map->max_register);
687 if (range_cfg->selector_reg > map->max_register) {
689 "Invalid range %d: selector out of map\n", i);
693 if (range_cfg->window_len == 0) {
694 dev_err(map->dev, "Invalid range %d: window_len 0\n",
699 /* Make sure, that this register range has no selector
700 or data window within its boundary */
701 for (j = 0; j < config->num_ranges; j++) {
702 unsigned sel_reg = config->ranges[j].selector_reg;
703 unsigned win_min = config->ranges[j].window_start;
704 unsigned win_max = win_min +
705 config->ranges[j].window_len - 1;
707 /* Allow data window inside its own virtual range */
711 if (range_cfg->range_min <= sel_reg &&
712 sel_reg <= range_cfg->range_max) {
714 "Range %d: selector for %d in window\n",
719 if (!(win_max < range_cfg->range_min ||
720 win_min > range_cfg->range_max)) {
722 "Range %d: window for %d in window\n",
728 new = kzalloc(sizeof(*new), GFP_KERNEL);
735 new->name = range_cfg->name;
736 new->range_min = range_cfg->range_min;
737 new->range_max = range_cfg->range_max;
738 new->selector_reg = range_cfg->selector_reg;
739 new->selector_mask = range_cfg->selector_mask;
740 new->selector_shift = range_cfg->selector_shift;
741 new->window_start = range_cfg->window_start;
742 new->window_len = range_cfg->window_len;
744 if (!_regmap_range_add(map, new)) {
745 dev_err(map->dev, "Failed to add range %d\n", i);
750 if (map->selector_work_buf == NULL) {
751 map->selector_work_buf =
752 kzalloc(map->format.buf_size, GFP_KERNEL);
753 if (map->selector_work_buf == NULL) {
760 ret = regcache_init(map, config);
765 ret = regmap_attach_dev(dev, map, config);
774 regmap_range_exit(map);
775 kfree(map->work_buf);
781 EXPORT_SYMBOL_GPL(regmap_init);
783 static void devm_regmap_release(struct device *dev, void *res)
785 regmap_exit(*(struct regmap **)res);
789 * devm_regmap_init(): Initialise managed register map
791 * @dev: Device that will be interacted with
792 * @bus: Bus-specific callbacks to use with device
793 * @bus_context: Data passed to bus-specific callbacks
794 * @config: Configuration for register map
796 * The return value will be an ERR_PTR() on error or a valid pointer
797 * to a struct regmap. This function should generally not be called
798 * directly, it should be called by bus-specific init functions. The
799 * map will be automatically freed by the device management code.
801 struct regmap *devm_regmap_init(struct device *dev,
802 const struct regmap_bus *bus,
804 const struct regmap_config *config)
806 struct regmap **ptr, *regmap;
808 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
810 return ERR_PTR(-ENOMEM);
812 regmap = regmap_init(dev, bus, bus_context, config);
813 if (!IS_ERR(regmap)) {
815 devres_add(dev, ptr);
822 EXPORT_SYMBOL_GPL(devm_regmap_init);
824 static void regmap_field_init(struct regmap_field *rm_field,
825 struct regmap *regmap, struct reg_field reg_field)
827 int field_bits = reg_field.msb - reg_field.lsb + 1;
828 rm_field->regmap = regmap;
829 rm_field->reg = reg_field.reg;
830 rm_field->shift = reg_field.lsb;
831 rm_field->mask = ((BIT(field_bits) - 1) << reg_field.lsb);
832 rm_field->id_size = reg_field.id_size;
833 rm_field->id_offset = reg_field.id_offset;
837 * devm_regmap_field_alloc(): Allocate and initialise a register field
840 * @dev: Device that will be interacted with
841 * @regmap: regmap bank in which this register field is located.
842 * @reg_field: Register field with in the bank.
844 * The return value will be an ERR_PTR() on error or a valid pointer
845 * to a struct regmap_field. The regmap_field will be automatically freed
846 * by the device management code.
848 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
849 struct regmap *regmap, struct reg_field reg_field)
851 struct regmap_field *rm_field = devm_kzalloc(dev,
852 sizeof(*rm_field), GFP_KERNEL);
854 return ERR_PTR(-ENOMEM);
856 regmap_field_init(rm_field, regmap, reg_field);
861 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
864 * devm_regmap_field_free(): Free register field allocated using
865 * devm_regmap_field_alloc. Usally drivers need not call this function,
866 * as the memory allocated via devm will be freed as per device-driver
869 * @dev: Device that will be interacted with
870 * @field: regmap field which should be freed.
872 void devm_regmap_field_free(struct device *dev,
873 struct regmap_field *field)
875 devm_kfree(dev, field);
877 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
880 * regmap_field_alloc(): Allocate and initialise a register field
883 * @regmap: regmap bank in which this register field is located.
884 * @reg_field: Register field with in the bank.
886 * The return value will be an ERR_PTR() on error or a valid pointer
887 * to a struct regmap_field. The regmap_field should be freed by the
888 * user once its finished working with it using regmap_field_free().
890 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
891 struct reg_field reg_field)
893 struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
896 return ERR_PTR(-ENOMEM);
898 regmap_field_init(rm_field, regmap, reg_field);
902 EXPORT_SYMBOL_GPL(regmap_field_alloc);
905 * regmap_field_free(): Free register field allocated using regmap_field_alloc
907 * @field: regmap field which should be freed.
909 void regmap_field_free(struct regmap_field *field)
913 EXPORT_SYMBOL_GPL(regmap_field_free);
916 * regmap_reinit_cache(): Reinitialise the current register cache
918 * @map: Register map to operate on.
919 * @config: New configuration. Only the cache data will be used.
921 * Discard any existing register cache for the map and initialize a
922 * new cache. This can be used to restore the cache to defaults or to
923 * update the cache configuration to reflect runtime discovery of the
926 * No explicit locking is done here, the user needs to ensure that
927 * this function will not race with other calls to regmap.
929 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
932 regmap_debugfs_exit(map);
934 map->max_register = config->max_register;
935 map->writeable_reg = config->writeable_reg;
936 map->readable_reg = config->readable_reg;
937 map->volatile_reg = config->volatile_reg;
938 map->precious_reg = config->precious_reg;
939 map->cache_type = config->cache_type;
941 regmap_debugfs_init(map, config->name);
943 map->cache_bypass = false;
944 map->cache_only = false;
946 return regcache_init(map, config);
948 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
951 * regmap_exit(): Free a previously allocated register map
953 void regmap_exit(struct regmap *map)
955 struct regmap_async *async;
958 regmap_debugfs_exit(map);
959 regmap_range_exit(map);
960 if (map->bus && map->bus->free_context)
961 map->bus->free_context(map->bus_context);
962 kfree(map->work_buf);
963 while (!list_empty(&map->async_free)) {
964 async = list_first_entry_or_null(&map->async_free,
967 list_del(&async->list);
968 kfree(async->work_buf);
973 EXPORT_SYMBOL_GPL(regmap_exit);
975 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
977 struct regmap **r = res;
983 /* If the user didn't specify a name match any */
985 return (*r)->name == data;
991 * dev_get_regmap(): Obtain the regmap (if any) for a device
993 * @dev: Device to retrieve the map for
994 * @name: Optional name for the register map, usually NULL.
996 * Returns the regmap for the device if one is present, or NULL. If
997 * name is specified then it must match the name specified when
998 * registering the device, if it is NULL then the first regmap found
999 * will be used. Devices with multiple register maps are very rare,
1000 * generic code should normally not need to specify a name.
1002 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1004 struct regmap **r = devres_find(dev, dev_get_regmap_release,
1005 dev_get_regmap_match, (void *)name);
1011 EXPORT_SYMBOL_GPL(dev_get_regmap);
1013 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1014 struct regmap_range_node *range,
1015 unsigned int val_num)
1017 void *orig_work_buf;
1018 unsigned int win_offset;
1019 unsigned int win_page;
1023 win_offset = (*reg - range->range_min) % range->window_len;
1024 win_page = (*reg - range->range_min) / range->window_len;
1027 /* Bulk write shouldn't cross range boundary */
1028 if (*reg + val_num - 1 > range->range_max)
1031 /* ... or single page boundary */
1032 if (val_num > range->window_len - win_offset)
1036 /* It is possible to have selector register inside data window.
1037 In that case, selector register is located on every page and
1038 it needs no page switching, when accessed alone. */
1040 range->window_start + win_offset != range->selector_reg) {
1041 /* Use separate work_buf during page switching */
1042 orig_work_buf = map->work_buf;
1043 map->work_buf = map->selector_work_buf;
1045 ret = _regmap_update_bits(map, range->selector_reg,
1046 range->selector_mask,
1047 win_page << range->selector_shift,
1050 map->work_buf = orig_work_buf;
1056 *reg = range->window_start + win_offset;
1061 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1062 const void *val, size_t val_len)
1064 struct regmap_range_node *range;
1065 unsigned long flags;
1066 u8 *u8 = map->work_buf;
1067 void *work_val = map->work_buf + map->format.reg_bytes +
1068 map->format.pad_bytes;
1070 int ret = -ENOTSUPP;
1076 /* Check for unwritable registers before we start */
1077 if (map->writeable_reg)
1078 for (i = 0; i < val_len / map->format.val_bytes; i++)
1079 if (!map->writeable_reg(map->dev,
1080 reg + (i * map->reg_stride)))
1083 if (!map->cache_bypass && map->format.parse_val) {
1085 int val_bytes = map->format.val_bytes;
1086 for (i = 0; i < val_len / val_bytes; i++) {
1087 ival = map->format.parse_val(val + (i * val_bytes));
1088 ret = regcache_write(map, reg + (i * map->reg_stride),
1092 "Error in caching of register: %x ret: %d\n",
1097 if (map->cache_only) {
1098 map->cache_dirty = true;
1103 range = _regmap_range_lookup(map, reg);
1105 int val_num = val_len / map->format.val_bytes;
1106 int win_offset = (reg - range->range_min) % range->window_len;
1107 int win_residue = range->window_len - win_offset;
1109 /* If the write goes beyond the end of the window split it */
1110 while (val_num > win_residue) {
1111 dev_dbg(map->dev, "Writing window %d/%zu\n",
1112 win_residue, val_len / map->format.val_bytes);
1113 ret = _regmap_raw_write(map, reg, val, win_residue *
1114 map->format.val_bytes);
1119 val_num -= win_residue;
1120 val += win_residue * map->format.val_bytes;
1121 val_len -= win_residue * map->format.val_bytes;
1123 win_offset = (reg - range->range_min) %
1125 win_residue = range->window_len - win_offset;
1128 ret = _regmap_select_page(map, ®, range, val_num);
1133 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1135 u8[0] |= map->write_flag_mask;
1138 * Essentially all I/O mechanisms will be faster with a single
1139 * buffer to write. Since register syncs often generate raw
1140 * writes of single registers optimise that case.
1142 if (val != work_val && val_len == map->format.val_bytes) {
1143 memcpy(work_val, val, map->format.val_bytes);
1147 if (map->async && map->bus->async_write) {
1148 struct regmap_async *async;
1150 trace_regmap_async_write_start(map->dev, reg, val_len);
1152 spin_lock_irqsave(&map->async_lock, flags);
1153 async = list_first_entry_or_null(&map->async_free,
1154 struct regmap_async,
1157 list_del(&async->list);
1158 spin_unlock_irqrestore(&map->async_lock, flags);
1161 async = map->bus->async_alloc();
1165 async->work_buf = kzalloc(map->format.buf_size,
1166 GFP_KERNEL | GFP_DMA);
1167 if (!async->work_buf) {
1175 /* If the caller supplied the value we can use it safely. */
1176 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1177 map->format.reg_bytes + map->format.val_bytes);
1179 spin_lock_irqsave(&map->async_lock, flags);
1180 list_add_tail(&async->list, &map->async_list);
1181 spin_unlock_irqrestore(&map->async_lock, flags);
1183 if (val != work_val)
1184 ret = map->bus->async_write(map->bus_context,
1186 map->format.reg_bytes +
1187 map->format.pad_bytes,
1188 val, val_len, async);
1190 ret = map->bus->async_write(map->bus_context,
1192 map->format.reg_bytes +
1193 map->format.pad_bytes +
1194 val_len, NULL, 0, async);
1197 dev_err(map->dev, "Failed to schedule write: %d\n",
1200 spin_lock_irqsave(&map->async_lock, flags);
1201 list_move(&async->list, &map->async_free);
1202 spin_unlock_irqrestore(&map->async_lock, flags);
1208 trace_regmap_hw_write_start(map->dev, reg,
1209 val_len / map->format.val_bytes);
1211 /* If we're doing a single register write we can probably just
1212 * send the work_buf directly, otherwise try to do a gather
1215 if (val == work_val)
1216 ret = map->bus->write(map->bus_context, map->work_buf,
1217 map->format.reg_bytes +
1218 map->format.pad_bytes +
1220 else if (map->bus->gather_write)
1221 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1222 map->format.reg_bytes +
1223 map->format.pad_bytes,
1226 /* If that didn't work fall back on linearising by hand. */
1227 if (ret == -ENOTSUPP) {
1228 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1229 buf = kzalloc(len, GFP_KERNEL);
1233 memcpy(buf, map->work_buf, map->format.reg_bytes);
1234 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1236 ret = map->bus->write(map->bus_context, buf, len);
1241 trace_regmap_hw_write_done(map->dev, reg,
1242 val_len / map->format.val_bytes);
1248 * regmap_can_raw_write - Test if regmap_raw_write() is supported
1250 * @map: Map to check.
1252 bool regmap_can_raw_write(struct regmap *map)
1254 return map->bus && map->format.format_val && map->format.format_reg;
1256 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1258 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1262 struct regmap_range_node *range;
1263 struct regmap *map = context;
1265 WARN_ON(!map->bus || !map->format.format_write);
1267 range = _regmap_range_lookup(map, reg);
1269 ret = _regmap_select_page(map, ®, range, 1);
1274 map->format.format_write(map, reg, val);
1276 trace_regmap_hw_write_start(map->dev, reg, 1);
1278 ret = map->bus->write(map->bus_context, map->work_buf,
1279 map->format.buf_size);
1281 trace_regmap_hw_write_done(map->dev, reg, 1);
1286 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1289 struct regmap *map = context;
1291 WARN_ON(!map->bus || !map->format.format_val);
1293 map->format.format_val(map->work_buf + map->format.reg_bytes
1294 + map->format.pad_bytes, val, 0);
1295 return _regmap_raw_write(map, reg,
1297 map->format.reg_bytes +
1298 map->format.pad_bytes,
1299 map->format.val_bytes);
1302 static inline void *_regmap_map_get_context(struct regmap *map)
1304 return (map->bus) ? map : map->bus_context;
1307 int _regmap_write(struct regmap *map, unsigned int reg,
1311 void *context = _regmap_map_get_context(map);
1313 if (!regmap_writeable(map, reg))
1316 if (!map->cache_bypass && !map->defer_caching) {
1317 ret = regcache_write(map, reg, val);
1320 if (map->cache_only) {
1321 map->cache_dirty = true;
1327 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1328 dev_info(map->dev, "%x <= %x\n", reg, val);
1331 trace_regmap_reg_write(map->dev, reg, val);
1333 return map->reg_write(context, reg, val);
1337 * regmap_write(): Write a value to a single register
1339 * @map: Register map to write to
1340 * @reg: Register to write to
1341 * @val: Value to be written
1343 * A value of zero will be returned on success, a negative errno will
1344 * be returned in error cases.
1346 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1350 if (reg % map->reg_stride)
1353 map->lock(map->lock_arg);
1355 ret = _regmap_write(map, reg, val);
1357 map->unlock(map->lock_arg);
1361 EXPORT_SYMBOL_GPL(regmap_write);
1364 * regmap_write_async(): Write a value to a single register asynchronously
1366 * @map: Register map to write to
1367 * @reg: Register to write to
1368 * @val: Value to be written
1370 * A value of zero will be returned on success, a negative errno will
1371 * be returned in error cases.
1373 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1377 if (reg % map->reg_stride)
1380 map->lock(map->lock_arg);
1384 ret = _regmap_write(map, reg, val);
1388 map->unlock(map->lock_arg);
1392 EXPORT_SYMBOL_GPL(regmap_write_async);
1395 * regmap_raw_write(): Write raw values to one or more registers
1397 * @map: Register map to write to
1398 * @reg: Initial register to write to
1399 * @val: Block of data to be written, laid out for direct transmission to the
1401 * @val_len: Length of data pointed to by val.
1403 * This function is intended to be used for things like firmware
1404 * download where a large block of data needs to be transferred to the
1405 * device. No formatting will be done on the data provided.
1407 * A value of zero will be returned on success, a negative errno will
1408 * be returned in error cases.
1410 int regmap_raw_write(struct regmap *map, unsigned int reg,
1411 const void *val, size_t val_len)
1415 if (!regmap_can_raw_write(map))
1417 if (val_len % map->format.val_bytes)
1420 map->lock(map->lock_arg);
1422 ret = _regmap_raw_write(map, reg, val, val_len);
1424 map->unlock(map->lock_arg);
1428 EXPORT_SYMBOL_GPL(regmap_raw_write);
1431 * regmap_field_write(): Write a value to a single register field
1433 * @field: Register field to write to
1434 * @val: Value to be written
1436 * A value of zero will be returned on success, a negative errno will
1437 * be returned in error cases.
1439 int regmap_field_write(struct regmap_field *field, unsigned int val)
1441 return regmap_update_bits(field->regmap, field->reg,
1442 field->mask, val << field->shift);
1444 EXPORT_SYMBOL_GPL(regmap_field_write);
1447 * regmap_field_update_bits(): Perform a read/modify/write cycle
1448 * on the register field
1450 * @field: Register field to write to
1451 * @mask: Bitmask to change
1452 * @val: Value to be written
1454 * A value of zero will be returned on success, a negative errno will
1455 * be returned in error cases.
1457 int regmap_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
1459 mask = (mask << field->shift) & field->mask;
1461 return regmap_update_bits(field->regmap, field->reg,
1462 mask, val << field->shift);
1464 EXPORT_SYMBOL_GPL(regmap_field_update_bits);
1467 * regmap_fields_write(): Write a value to a single register field with port ID
1469 * @field: Register field to write to
1471 * @val: Value to be written
1473 * A value of zero will be returned on success, a negative errno will
1474 * be returned in error cases.
1476 int regmap_fields_write(struct regmap_field *field, unsigned int id,
1479 if (id >= field->id_size)
1482 return regmap_update_bits(field->regmap,
1483 field->reg + (field->id_offset * id),
1484 field->mask, val << field->shift);
1486 EXPORT_SYMBOL_GPL(regmap_fields_write);
1489 * regmap_fields_update_bits(): Perform a read/modify/write cycle
1490 * on the register field
1492 * @field: Register field to write to
1494 * @mask: Bitmask to change
1495 * @val: Value to be written
1497 * A value of zero will be returned on success, a negative errno will
1498 * be returned in error cases.
1500 int regmap_fields_update_bits(struct regmap_field *field, unsigned int id,
1501 unsigned int mask, unsigned int val)
1503 if (id >= field->id_size)
1506 mask = (mask << field->shift) & field->mask;
1508 return regmap_update_bits(field->regmap,
1509 field->reg + (field->id_offset * id),
1510 mask, val << field->shift);
1512 EXPORT_SYMBOL_GPL(regmap_fields_update_bits);
1515 * regmap_bulk_write(): Write multiple registers to the device
1517 * @map: Register map to write to
1518 * @reg: First register to be write from
1519 * @val: Block of data to be written, in native register size for device
1520 * @val_count: Number of registers to write
1522 * This function is intended to be used for writing a large block of
1523 * data to the device either in single transfer or multiple transfer.
1525 * A value of zero will be returned on success, a negative errno will
1526 * be returned in error cases.
1528 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1532 size_t val_bytes = map->format.val_bytes;
1534 if (map->bus && !map->format.parse_inplace)
1536 if (reg % map->reg_stride)
1540 * Some devices don't support bulk write, for
1541 * them we have a series of single write operations.
1543 if (!map->bus || map->use_single_rw) {
1544 map->lock(map->lock_arg);
1545 for (i = 0; i < val_count; i++) {
1548 switch (val_bytes) {
1550 ival = *(u8 *)(val + (i * val_bytes));
1553 ival = *(u16 *)(val + (i * val_bytes));
1556 ival = *(u32 *)(val + (i * val_bytes));
1560 ival = *(u64 *)(val + (i * val_bytes));
1568 ret = _regmap_write(map, reg + (i * map->reg_stride),
1574 map->unlock(map->lock_arg);
1578 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
1580 dev_err(map->dev, "Error in memory allocation\n");
1583 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1584 map->format.parse_inplace(wval + i);
1586 map->lock(map->lock_arg);
1587 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1588 map->unlock(map->lock_arg);
1594 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1597 * _regmap_raw_multi_reg_write()
1599 * the (register,newvalue) pairs in regs have not been formatted, but
1600 * they are all in the same page and have been changed to being page
1601 * relative. The page register has been written if that was neccessary.
1603 static int _regmap_raw_multi_reg_write(struct regmap *map,
1604 const struct reg_default *regs,
1611 size_t val_bytes = map->format.val_bytes;
1612 size_t reg_bytes = map->format.reg_bytes;
1613 size_t pad_bytes = map->format.pad_bytes;
1614 size_t pair_size = reg_bytes + pad_bytes + val_bytes;
1615 size_t len = pair_size * num_regs;
1617 buf = kzalloc(len, GFP_KERNEL);
1621 /* We have to linearise by hand. */
1625 for (i = 0; i < num_regs; i++) {
1626 int reg = regs[i].reg;
1627 int val = regs[i].def;
1628 trace_regmap_hw_write_start(map->dev, reg, 1);
1629 map->format.format_reg(u8, reg, map->reg_shift);
1630 u8 += reg_bytes + pad_bytes;
1631 map->format.format_val(u8, val, 0);
1635 *u8 |= map->write_flag_mask;
1637 ret = map->bus->write(map->bus_context, buf, len);
1641 for (i = 0; i < num_regs; i++) {
1642 int reg = regs[i].reg;
1643 trace_regmap_hw_write_done(map->dev, reg, 1);
1648 static unsigned int _regmap_register_page(struct regmap *map,
1650 struct regmap_range_node *range)
1652 unsigned int win_page = (reg - range->range_min) / range->window_len;
1657 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
1658 struct reg_default *regs,
1663 struct reg_default *base;
1664 unsigned int this_page;
1666 * the set of registers are not neccessarily in order, but
1667 * since the order of write must be preserved this algorithm
1668 * chops the set each time the page changes
1671 for (i = 0, n = 0; i < num_regs; i++, n++) {
1672 unsigned int reg = regs[i].reg;
1673 struct regmap_range_node *range;
1675 range = _regmap_range_lookup(map, reg);
1677 unsigned int win_page = _regmap_register_page(map, reg,
1681 this_page = win_page;
1682 if (win_page != this_page) {
1683 this_page = win_page;
1684 ret = _regmap_raw_multi_reg_write(map, base, n);
1690 ret = _regmap_select_page(map, &base[n].reg, range, 1);
1696 return _regmap_raw_multi_reg_write(map, base, n);
1700 static int _regmap_multi_reg_write(struct regmap *map,
1701 const struct reg_default *regs,
1707 if (!map->can_multi_write) {
1708 for (i = 0; i < num_regs; i++) {
1709 ret = _regmap_write(map, regs[i].reg, regs[i].def);
1716 if (!map->format.parse_inplace)
1719 if (map->writeable_reg)
1720 for (i = 0; i < num_regs; i++) {
1721 int reg = regs[i].reg;
1722 if (!map->writeable_reg(map->dev, reg))
1724 if (reg % map->reg_stride)
1728 if (!map->cache_bypass) {
1729 for (i = 0; i < num_regs; i++) {
1730 unsigned int val = regs[i].def;
1731 unsigned int reg = regs[i].reg;
1732 ret = regcache_write(map, reg, val);
1735 "Error in caching of register: %x ret: %d\n",
1740 if (map->cache_only) {
1741 map->cache_dirty = true;
1748 for (i = 0; i < num_regs; i++) {
1749 unsigned int reg = regs[i].reg;
1750 struct regmap_range_node *range;
1751 range = _regmap_range_lookup(map, reg);
1753 size_t len = sizeof(struct reg_default)*num_regs;
1754 struct reg_default *base = kmemdup(regs, len,
1758 ret = _regmap_range_multi_paged_reg_write(map, base,
1765 return _regmap_raw_multi_reg_write(map, regs, num_regs);
1769 * regmap_multi_reg_write(): Write multiple registers to the device
1771 * where the set of register,value pairs are supplied in any order,
1772 * possibly not all in a single range.
1774 * @map: Register map to write to
1775 * @regs: Array of structures containing register,value to be written
1776 * @num_regs: Number of registers to write
1778 * The 'normal' block write mode will send ultimately send data on the
1779 * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
1780 * addressed. However, this alternative block multi write mode will send
1781 * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
1782 * must of course support the mode.
1784 * A value of zero will be returned on success, a negative errno will be
1785 * returned in error cases.
1787 int regmap_multi_reg_write(struct regmap *map, const struct reg_default *regs,
1792 map->lock(map->lock_arg);
1794 ret = _regmap_multi_reg_write(map, regs, num_regs);
1796 map->unlock(map->lock_arg);
1800 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
1803 * regmap_multi_reg_write_bypassed(): Write multiple registers to the
1804 * device but not the cache
1806 * where the set of register are supplied in any order
1808 * @map: Register map to write to
1809 * @regs: Array of structures containing register,value to be written
1810 * @num_regs: Number of registers to write
1812 * This function is intended to be used for writing a large block of data
1813 * atomically to the device in single transfer for those I2C client devices
1814 * that implement this alternative block write mode.
1816 * A value of zero will be returned on success, a negative errno will
1817 * be returned in error cases.
1819 int regmap_multi_reg_write_bypassed(struct regmap *map,
1820 const struct reg_default *regs,
1826 map->lock(map->lock_arg);
1828 bypass = map->cache_bypass;
1829 map->cache_bypass = true;
1831 ret = _regmap_multi_reg_write(map, regs, num_regs);
1833 map->cache_bypass = bypass;
1835 map->unlock(map->lock_arg);
1839 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
1842 * regmap_raw_write_async(): Write raw values to one or more registers
1845 * @map: Register map to write to
1846 * @reg: Initial register to write to
1847 * @val: Block of data to be written, laid out for direct transmission to the
1848 * device. Must be valid until regmap_async_complete() is called.
1849 * @val_len: Length of data pointed to by val.
1851 * This function is intended to be used for things like firmware
1852 * download where a large block of data needs to be transferred to the
1853 * device. No formatting will be done on the data provided.
1855 * If supported by the underlying bus the write will be scheduled
1856 * asynchronously, helping maximise I/O speed on higher speed buses
1857 * like SPI. regmap_async_complete() can be called to ensure that all
1858 * asynchrnous writes have been completed.
1860 * A value of zero will be returned on success, a negative errno will
1861 * be returned in error cases.
1863 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
1864 const void *val, size_t val_len)
1868 if (val_len % map->format.val_bytes)
1870 if (reg % map->reg_stride)
1873 map->lock(map->lock_arg);
1877 ret = _regmap_raw_write(map, reg, val, val_len);
1881 map->unlock(map->lock_arg);
1885 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
1887 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1888 unsigned int val_len)
1890 struct regmap_range_node *range;
1891 u8 *u8 = map->work_buf;
1896 range = _regmap_range_lookup(map, reg);
1898 ret = _regmap_select_page(map, ®, range,
1899 val_len / map->format.val_bytes);
1904 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1907 * Some buses or devices flag reads by setting the high bits in the
1908 * register addresss; since it's always the high bits for all
1909 * current formats we can do this here rather than in
1910 * formatting. This may break if we get interesting formats.
1912 u8[0] |= map->read_flag_mask;
1914 trace_regmap_hw_read_start(map->dev, reg,
1915 val_len / map->format.val_bytes);
1917 ret = map->bus->read(map->bus_context, map->work_buf,
1918 map->format.reg_bytes + map->format.pad_bytes,
1921 trace_regmap_hw_read_done(map->dev, reg,
1922 val_len / map->format.val_bytes);
1927 static int _regmap_bus_read(void *context, unsigned int reg,
1931 struct regmap *map = context;
1933 if (!map->format.parse_val)
1936 ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
1938 *val = map->format.parse_val(map->work_buf);
1943 static int _regmap_read(struct regmap *map, unsigned int reg,
1947 void *context = _regmap_map_get_context(map);
1949 WARN_ON(!map->reg_read);
1951 if (!map->cache_bypass) {
1952 ret = regcache_read(map, reg, val);
1957 if (map->cache_only)
1960 if (!regmap_readable(map, reg))
1963 ret = map->reg_read(context, reg, val);
1966 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1967 dev_info(map->dev, "%x => %x\n", reg, *val);
1970 trace_regmap_reg_read(map->dev, reg, *val);
1972 if (!map->cache_bypass)
1973 regcache_write(map, reg, *val);
1980 * regmap_read(): Read a value from a single register
1982 * @map: Register map to read from
1983 * @reg: Register to be read from
1984 * @val: Pointer to store read value
1986 * A value of zero will be returned on success, a negative errno will
1987 * be returned in error cases.
1989 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
1993 if (reg % map->reg_stride)
1996 map->lock(map->lock_arg);
1998 ret = _regmap_read(map, reg, val);
2000 map->unlock(map->lock_arg);
2004 EXPORT_SYMBOL_GPL(regmap_read);
2007 * regmap_raw_read(): Read raw data from the device
2009 * @map: Register map to read from
2010 * @reg: First register to be read from
2011 * @val: Pointer to store read value
2012 * @val_len: Size of data to read
2014 * A value of zero will be returned on success, a negative errno will
2015 * be returned in error cases.
2017 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2020 size_t val_bytes = map->format.val_bytes;
2021 size_t val_count = val_len / val_bytes;
2027 if (val_len % map->format.val_bytes)
2029 if (reg % map->reg_stride)
2032 map->lock(map->lock_arg);
2034 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2035 map->cache_type == REGCACHE_NONE) {
2036 /* Physical block read if there's no cache involved */
2037 ret = _regmap_raw_read(map, reg, val, val_len);
2040 /* Otherwise go word by word for the cache; should be low
2041 * cost as we expect to hit the cache.
2043 for (i = 0; i < val_count; i++) {
2044 ret = _regmap_read(map, reg + (i * map->reg_stride),
2049 map->format.format_val(val + (i * val_bytes), v, 0);
2054 map->unlock(map->lock_arg);
2058 EXPORT_SYMBOL_GPL(regmap_raw_read);
2061 * regmap_field_read(): Read a value to a single register field
2063 * @field: Register field to read from
2064 * @val: Pointer to store read value
2066 * A value of zero will be returned on success, a negative errno will
2067 * be returned in error cases.
2069 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2072 unsigned int reg_val;
2073 ret = regmap_read(field->regmap, field->reg, ®_val);
2077 reg_val &= field->mask;
2078 reg_val >>= field->shift;
2083 EXPORT_SYMBOL_GPL(regmap_field_read);
2086 * regmap_fields_read(): Read a value to a single register field with port ID
2088 * @field: Register field to read from
2090 * @val: Pointer to store read value
2092 * A value of zero will be returned on success, a negative errno will
2093 * be returned in error cases.
2095 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2099 unsigned int reg_val;
2101 if (id >= field->id_size)
2104 ret = regmap_read(field->regmap,
2105 field->reg + (field->id_offset * id),
2110 reg_val &= field->mask;
2111 reg_val >>= field->shift;
2116 EXPORT_SYMBOL_GPL(regmap_fields_read);
2119 * regmap_bulk_read(): Read multiple registers from the device
2121 * @map: Register map to read from
2122 * @reg: First register to be read from
2123 * @val: Pointer to store read value, in native register size for device
2124 * @val_count: Number of registers to read
2126 * A value of zero will be returned on success, a negative errno will
2127 * be returned in error cases.
2129 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2133 size_t val_bytes = map->format.val_bytes;
2134 bool vol = regmap_volatile_range(map, reg, val_count);
2136 if (reg % map->reg_stride)
2139 if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2141 * Some devices does not support bulk read, for
2142 * them we have a series of single read operations.
2144 if (map->use_single_rw) {
2145 for (i = 0; i < val_count; i++) {
2146 ret = regmap_raw_read(map,
2147 reg + (i * map->reg_stride),
2148 val + (i * val_bytes),
2154 ret = regmap_raw_read(map, reg, val,
2155 val_bytes * val_count);
2160 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2161 map->format.parse_inplace(val + i);
2163 for (i = 0; i < val_count; i++) {
2165 ret = regmap_read(map, reg + (i * map->reg_stride),
2169 memcpy(val + (i * val_bytes), &ival, val_bytes);
2175 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2177 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2178 unsigned int mask, unsigned int val,
2182 unsigned int tmp, orig;
2184 ret = _regmap_read(map, reg, &orig);
2192 ret = _regmap_write(map, reg, tmp);
2204 * regmap_update_bits: Perform a read/modify/write cycle on the register map
2206 * @map: Register map to update
2207 * @reg: Register to update
2208 * @mask: Bitmask to change
2209 * @val: New value for bitmask
2211 * Returns zero for success, a negative number on error.
2213 int regmap_update_bits(struct regmap *map, unsigned int reg,
2214 unsigned int mask, unsigned int val)
2218 map->lock(map->lock_arg);
2219 ret = _regmap_update_bits(map, reg, mask, val, NULL);
2220 map->unlock(map->lock_arg);
2224 EXPORT_SYMBOL_GPL(regmap_update_bits);
2227 * regmap_update_bits_async: Perform a read/modify/write cycle on the register
2228 * map asynchronously
2230 * @map: Register map to update
2231 * @reg: Register to update
2232 * @mask: Bitmask to change
2233 * @val: New value for bitmask
2235 * With most buses the read must be done synchronously so this is most
2236 * useful for devices with a cache which do not need to interact with
2237 * the hardware to determine the current register value.
2239 * Returns zero for success, a negative number on error.
2241 int regmap_update_bits_async(struct regmap *map, unsigned int reg,
2242 unsigned int mask, unsigned int val)
2246 map->lock(map->lock_arg);
2250 ret = _regmap_update_bits(map, reg, mask, val, NULL);
2254 map->unlock(map->lock_arg);
2258 EXPORT_SYMBOL_GPL(regmap_update_bits_async);
2261 * regmap_update_bits_check: Perform a read/modify/write cycle on the
2262 * register map and report if updated
2264 * @map: Register map to update
2265 * @reg: Register to update
2266 * @mask: Bitmask to change
2267 * @val: New value for bitmask
2268 * @change: Boolean indicating if a write was done
2270 * Returns zero for success, a negative number on error.
2272 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
2273 unsigned int mask, unsigned int val,
2278 map->lock(map->lock_arg);
2279 ret = _regmap_update_bits(map, reg, mask, val, change);
2280 map->unlock(map->lock_arg);
2283 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
2286 * regmap_update_bits_check_async: Perform a read/modify/write cycle on the
2287 * register map asynchronously and report if
2290 * @map: Register map to update
2291 * @reg: Register to update
2292 * @mask: Bitmask to change
2293 * @val: New value for bitmask
2294 * @change: Boolean indicating if a write was done
2296 * With most buses the read must be done synchronously so this is most
2297 * useful for devices with a cache which do not need to interact with
2298 * the hardware to determine the current register value.
2300 * Returns zero for success, a negative number on error.
2302 int regmap_update_bits_check_async(struct regmap *map, unsigned int reg,
2303 unsigned int mask, unsigned int val,
2308 map->lock(map->lock_arg);
2312 ret = _regmap_update_bits(map, reg, mask, val, change);
2316 map->unlock(map->lock_arg);
2320 EXPORT_SYMBOL_GPL(regmap_update_bits_check_async);
2322 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2324 struct regmap *map = async->map;
2327 trace_regmap_async_io_complete(map->dev);
2329 spin_lock(&map->async_lock);
2330 list_move(&async->list, &map->async_free);
2331 wake = list_empty(&map->async_list);
2334 map->async_ret = ret;
2336 spin_unlock(&map->async_lock);
2339 wake_up(&map->async_waitq);
2341 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2343 static int regmap_async_is_done(struct regmap *map)
2345 unsigned long flags;
2348 spin_lock_irqsave(&map->async_lock, flags);
2349 ret = list_empty(&map->async_list);
2350 spin_unlock_irqrestore(&map->async_lock, flags);
2356 * regmap_async_complete: Ensure all asynchronous I/O has completed.
2358 * @map: Map to operate on.
2360 * Blocks until any pending asynchronous I/O has completed. Returns
2361 * an error code for any failed I/O operations.
2363 int regmap_async_complete(struct regmap *map)
2365 unsigned long flags;
2368 /* Nothing to do with no async support */
2369 if (!map->bus || !map->bus->async_write)
2372 trace_regmap_async_complete_start(map->dev);
2374 wait_event(map->async_waitq, regmap_async_is_done(map));
2376 spin_lock_irqsave(&map->async_lock, flags);
2377 ret = map->async_ret;
2379 spin_unlock_irqrestore(&map->async_lock, flags);
2381 trace_regmap_async_complete_done(map->dev);
2385 EXPORT_SYMBOL_GPL(regmap_async_complete);
2388 * regmap_register_patch: Register and apply register updates to be applied
2389 * on device initialistion
2391 * @map: Register map to apply updates to.
2392 * @regs: Values to update.
2393 * @num_regs: Number of entries in regs.
2395 * Register a set of register updates to be applied to the device
2396 * whenever the device registers are synchronised with the cache and
2397 * apply them immediately. Typically this is used to apply
2398 * corrections to be applied to the device defaults on startup, such
2399 * as the updates some vendors provide to undocumented registers.
2401 * The caller must ensure that this function cannot be called
2402 * concurrently with either itself or regcache_sync().
2404 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
2407 struct reg_default *p;
2411 if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2415 p = krealloc(map->patch,
2416 sizeof(struct reg_default) * (map->patch_regs + num_regs),
2419 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2421 map->patch_regs += num_regs;
2426 map->lock(map->lock_arg);
2428 bypass = map->cache_bypass;
2430 map->cache_bypass = true;
2433 ret = _regmap_multi_reg_write(map, regs, num_regs);
2439 map->cache_bypass = bypass;
2441 map->unlock(map->lock_arg);
2443 regmap_async_complete(map);
2447 EXPORT_SYMBOL_GPL(regmap_register_patch);
2450 * regmap_get_val_bytes(): Report the size of a register value
2452 * Report the size of a register value, mainly intended to for use by
2453 * generic infrastructure built on top of regmap.
2455 int regmap_get_val_bytes(struct regmap *map)
2457 if (map->format.format_write)
2460 return map->format.val_bytes;
2462 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2464 int regmap_parse_val(struct regmap *map, const void *buf,
2467 if (!map->format.parse_val)
2470 *val = map->format.parse_val(buf);
2474 EXPORT_SYMBOL_GPL(regmap_parse_val);
2476 static int __init regmap_initcall(void)
2478 regmap_debugfs_initcall();
2482 postcore_initcall(regmap_initcall);