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>
20 #define CREATE_TRACE_POINTS
21 #include <trace/events/regmap.h>
26 * Sometimes for failures during very early init the trace
27 * infrastructure isn't available early enough to be used. For this
28 * sort of problem defining LOG_DEVICE will add printks for basic
29 * register I/O on a specific device.
33 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
34 unsigned int mask, unsigned int val,
37 bool regmap_writeable(struct regmap *map, unsigned int reg)
39 if (map->max_register && reg > map->max_register)
42 if (map->writeable_reg)
43 return map->writeable_reg(map->dev, reg);
48 bool regmap_readable(struct regmap *map, unsigned int reg)
50 if (map->max_register && reg > map->max_register)
53 if (map->format.format_write)
56 if (map->readable_reg)
57 return map->readable_reg(map->dev, reg);
62 bool regmap_volatile(struct regmap *map, unsigned int reg)
64 if (!regmap_readable(map, reg))
67 if (map->volatile_reg)
68 return map->volatile_reg(map->dev, reg);
73 bool regmap_precious(struct regmap *map, unsigned int reg)
75 if (!regmap_readable(map, reg))
78 if (map->precious_reg)
79 return map->precious_reg(map->dev, reg);
84 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
89 for (i = 0; i < num; i++)
90 if (!regmap_volatile(map, reg + i))
96 static void regmap_format_2_6_write(struct regmap *map,
97 unsigned int reg, unsigned int val)
99 u8 *out = map->work_buf;
101 *out = (reg << 6) | val;
104 static void regmap_format_4_12_write(struct regmap *map,
105 unsigned int reg, unsigned int val)
107 __be16 *out = map->work_buf;
108 *out = cpu_to_be16((reg << 12) | val);
111 static void regmap_format_7_9_write(struct regmap *map,
112 unsigned int reg, unsigned int val)
114 __be16 *out = map->work_buf;
115 *out = cpu_to_be16((reg << 9) | val);
118 static void regmap_format_10_14_write(struct regmap *map,
119 unsigned int reg, unsigned int val)
121 u8 *out = map->work_buf;
124 out[1] = (val >> 8) | (reg << 6);
128 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
135 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
139 b[0] = cpu_to_be16(val << shift);
142 static void regmap_format_16_native(void *buf, unsigned int val,
145 *(u16 *)buf = val << shift;
148 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
159 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
163 b[0] = cpu_to_be32(val << shift);
166 static void regmap_format_32_native(void *buf, unsigned int val,
169 *(u32 *)buf = val << shift;
172 static unsigned int regmap_parse_8(void *buf)
179 static unsigned int regmap_parse_16_be(void *buf)
183 b[0] = be16_to_cpu(b[0]);
188 static unsigned int regmap_parse_16_native(void *buf)
193 static unsigned int regmap_parse_24(void *buf)
196 unsigned int ret = b[2];
197 ret |= ((unsigned int)b[1]) << 8;
198 ret |= ((unsigned int)b[0]) << 16;
203 static unsigned int regmap_parse_32_be(void *buf)
207 b[0] = be32_to_cpu(b[0]);
212 static unsigned int regmap_parse_32_native(void *buf)
217 static void regmap_lock_mutex(struct regmap *map)
219 mutex_lock(&map->mutex);
222 static void regmap_unlock_mutex(struct regmap *map)
224 mutex_unlock(&map->mutex);
227 static void regmap_lock_spinlock(struct regmap *map)
229 spin_lock(&map->spinlock);
232 static void regmap_unlock_spinlock(struct regmap *map)
234 spin_unlock(&map->spinlock);
237 static void dev_get_regmap_release(struct device *dev, void *res)
240 * We don't actually have anything to do here; the goal here
241 * is not to manage the regmap but to provide a simple way to
242 * get the regmap back given a struct device.
246 static bool _regmap_range_add(struct regmap *map,
247 struct regmap_range_node *data)
249 struct rb_root *root = &map->range_tree;
250 struct rb_node **new = &(root->rb_node), *parent = NULL;
253 struct regmap_range_node *this =
254 container_of(*new, struct regmap_range_node, node);
257 if (data->range_max < this->range_min)
258 new = &((*new)->rb_left);
259 else if (data->range_min > this->range_max)
260 new = &((*new)->rb_right);
265 rb_link_node(&data->node, parent, new);
266 rb_insert_color(&data->node, root);
271 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
274 struct rb_node *node = map->range_tree.rb_node;
277 struct regmap_range_node *this =
278 container_of(node, struct regmap_range_node, node);
280 if (reg < this->range_min)
281 node = node->rb_left;
282 else if (reg > this->range_max)
283 node = node->rb_right;
291 static void regmap_range_exit(struct regmap *map)
293 struct rb_node *next;
294 struct regmap_range_node *range_node;
296 next = rb_first(&map->range_tree);
298 range_node = rb_entry(next, struct regmap_range_node, node);
299 next = rb_next(&range_node->node);
300 rb_erase(&range_node->node, &map->range_tree);
304 kfree(map->selector_work_buf);
308 * regmap_init(): Initialise register map
310 * @dev: Device that will be interacted with
311 * @bus: Bus-specific callbacks to use with device
312 * @bus_context: Data passed to bus-specific callbacks
313 * @config: Configuration for register map
315 * The return value will be an ERR_PTR() on error or a valid pointer to
316 * a struct regmap. This function should generally not be called
317 * directly, it should be called by bus-specific init functions.
319 struct regmap *regmap_init(struct device *dev,
320 const struct regmap_bus *bus,
322 const struct regmap_config *config)
324 struct regmap *map, **m;
326 enum regmap_endian reg_endian, val_endian;
332 map = kzalloc(sizeof(*map), GFP_KERNEL);
339 spin_lock_init(&map->spinlock);
340 map->lock = regmap_lock_spinlock;
341 map->unlock = regmap_unlock_spinlock;
343 mutex_init(&map->mutex);
344 map->lock = regmap_lock_mutex;
345 map->unlock = regmap_unlock_mutex;
347 map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
348 map->format.pad_bytes = config->pad_bits / 8;
349 map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
350 map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
351 config->val_bits + config->pad_bits, 8);
352 map->reg_shift = config->pad_bits % 8;
353 if (config->reg_stride)
354 map->reg_stride = config->reg_stride;
357 map->use_single_rw = config->use_single_rw;
360 map->bus_context = bus_context;
361 map->max_register = config->max_register;
362 map->writeable_reg = config->writeable_reg;
363 map->readable_reg = config->readable_reg;
364 map->volatile_reg = config->volatile_reg;
365 map->precious_reg = config->precious_reg;
366 map->cache_type = config->cache_type;
367 map->name = config->name;
369 if (config->read_flag_mask || config->write_flag_mask) {
370 map->read_flag_mask = config->read_flag_mask;
371 map->write_flag_mask = config->write_flag_mask;
373 map->read_flag_mask = bus->read_flag_mask;
376 reg_endian = config->reg_format_endian;
377 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
378 reg_endian = bus->reg_format_endian_default;
379 if (reg_endian == REGMAP_ENDIAN_DEFAULT)
380 reg_endian = REGMAP_ENDIAN_BIG;
382 val_endian = config->val_format_endian;
383 if (val_endian == REGMAP_ENDIAN_DEFAULT)
384 val_endian = bus->val_format_endian_default;
385 if (val_endian == REGMAP_ENDIAN_DEFAULT)
386 val_endian = REGMAP_ENDIAN_BIG;
388 switch (config->reg_bits + map->reg_shift) {
390 switch (config->val_bits) {
392 map->format.format_write = regmap_format_2_6_write;
400 switch (config->val_bits) {
402 map->format.format_write = regmap_format_4_12_write;
410 switch (config->val_bits) {
412 map->format.format_write = regmap_format_7_9_write;
420 switch (config->val_bits) {
422 map->format.format_write = regmap_format_10_14_write;
430 map->format.format_reg = regmap_format_8;
434 switch (reg_endian) {
435 case REGMAP_ENDIAN_BIG:
436 map->format.format_reg = regmap_format_16_be;
438 case REGMAP_ENDIAN_NATIVE:
439 map->format.format_reg = regmap_format_16_native;
447 switch (reg_endian) {
448 case REGMAP_ENDIAN_BIG:
449 map->format.format_reg = regmap_format_32_be;
451 case REGMAP_ENDIAN_NATIVE:
452 map->format.format_reg = regmap_format_32_native;
463 switch (config->val_bits) {
465 map->format.format_val = regmap_format_8;
466 map->format.parse_val = regmap_parse_8;
469 switch (val_endian) {
470 case REGMAP_ENDIAN_BIG:
471 map->format.format_val = regmap_format_16_be;
472 map->format.parse_val = regmap_parse_16_be;
474 case REGMAP_ENDIAN_NATIVE:
475 map->format.format_val = regmap_format_16_native;
476 map->format.parse_val = regmap_parse_16_native;
483 if (val_endian != REGMAP_ENDIAN_BIG)
485 map->format.format_val = regmap_format_24;
486 map->format.parse_val = regmap_parse_24;
489 switch (val_endian) {
490 case REGMAP_ENDIAN_BIG:
491 map->format.format_val = regmap_format_32_be;
492 map->format.parse_val = regmap_parse_32_be;
494 case REGMAP_ENDIAN_NATIVE:
495 map->format.format_val = regmap_format_32_native;
496 map->format.parse_val = regmap_parse_32_native;
504 if (map->format.format_write) {
505 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
506 (val_endian != REGMAP_ENDIAN_BIG))
508 map->use_single_rw = true;
511 if (!map->format.format_write &&
512 !(map->format.format_reg && map->format.format_val))
515 map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
516 if (map->work_buf == NULL) {
521 map->range_tree = RB_ROOT;
522 for (i = 0; i < config->num_ranges; i++) {
523 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
524 struct regmap_range_node *new;
527 if (range_cfg->range_max < range_cfg->range_min) {
528 dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
529 range_cfg->range_max, range_cfg->range_min);
533 if (range_cfg->range_max > map->max_register) {
534 dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
535 range_cfg->range_max, map->max_register);
539 if (range_cfg->selector_reg > map->max_register) {
541 "Invalid range %d: selector out of map\n", i);
545 if (range_cfg->window_len == 0) {
546 dev_err(map->dev, "Invalid range %d: window_len 0\n",
551 /* Make sure, that this register range has no selector
552 or data window within its boundary */
553 for (j = 0; j < config->num_ranges; j++) {
554 unsigned sel_reg = config->ranges[j].selector_reg;
555 unsigned win_min = config->ranges[j].window_start;
556 unsigned win_max = win_min +
557 config->ranges[j].window_len - 1;
559 if (range_cfg->range_min <= sel_reg &&
560 sel_reg <= range_cfg->range_max) {
562 "Range %d: selector for %d in window\n",
567 if (!(win_max < range_cfg->range_min ||
568 win_min > range_cfg->range_max)) {
570 "Range %d: window for %d in window\n",
576 new = kzalloc(sizeof(*new), GFP_KERNEL);
583 new->name = range_cfg->name;
584 new->range_min = range_cfg->range_min;
585 new->range_max = range_cfg->range_max;
586 new->selector_reg = range_cfg->selector_reg;
587 new->selector_mask = range_cfg->selector_mask;
588 new->selector_shift = range_cfg->selector_shift;
589 new->window_start = range_cfg->window_start;
590 new->window_len = range_cfg->window_len;
592 if (_regmap_range_add(map, new) == false) {
593 dev_err(map->dev, "Failed to add range %d\n", i);
598 if (map->selector_work_buf == NULL) {
599 map->selector_work_buf =
600 kzalloc(map->format.buf_size, GFP_KERNEL);
601 if (map->selector_work_buf == NULL) {
608 ret = regcache_init(map, config);
612 regmap_debugfs_init(map, config->name);
614 /* Add a devres resource for dev_get_regmap() */
615 m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
626 regmap_debugfs_exit(map);
629 regmap_range_exit(map);
630 kfree(map->work_buf);
636 EXPORT_SYMBOL_GPL(regmap_init);
638 static void devm_regmap_release(struct device *dev, void *res)
640 regmap_exit(*(struct regmap **)res);
644 * devm_regmap_init(): Initialise managed register map
646 * @dev: Device that will be interacted with
647 * @bus: Bus-specific callbacks to use with device
648 * @bus_context: Data passed to bus-specific callbacks
649 * @config: Configuration for register map
651 * The return value will be an ERR_PTR() on error or a valid pointer
652 * to a struct regmap. This function should generally not be called
653 * directly, it should be called by bus-specific init functions. The
654 * map will be automatically freed by the device management code.
656 struct regmap *devm_regmap_init(struct device *dev,
657 const struct regmap_bus *bus,
659 const struct regmap_config *config)
661 struct regmap **ptr, *regmap;
663 ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
665 return ERR_PTR(-ENOMEM);
667 regmap = regmap_init(dev, bus, bus_context, config);
668 if (!IS_ERR(regmap)) {
670 devres_add(dev, ptr);
677 EXPORT_SYMBOL_GPL(devm_regmap_init);
680 * regmap_reinit_cache(): Reinitialise the current register cache
682 * @map: Register map to operate on.
683 * @config: New configuration. Only the cache data will be used.
685 * Discard any existing register cache for the map and initialize a
686 * new cache. This can be used to restore the cache to defaults or to
687 * update the cache configuration to reflect runtime discovery of the
690 * No explicit locking is done here, the user needs to ensure that
691 * this function will not race with other calls to regmap.
693 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
696 regmap_debugfs_exit(map);
698 map->max_register = config->max_register;
699 map->writeable_reg = config->writeable_reg;
700 map->readable_reg = config->readable_reg;
701 map->volatile_reg = config->volatile_reg;
702 map->precious_reg = config->precious_reg;
703 map->cache_type = config->cache_type;
705 regmap_debugfs_init(map, config->name);
707 map->cache_bypass = false;
708 map->cache_only = false;
710 return regcache_init(map, config);
712 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
715 * regmap_exit(): Free a previously allocated register map
717 void regmap_exit(struct regmap *map)
720 regmap_debugfs_exit(map);
721 regmap_range_exit(map);
722 if (map->bus->free_context)
723 map->bus->free_context(map->bus_context);
724 kfree(map->work_buf);
727 EXPORT_SYMBOL_GPL(regmap_exit);
729 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
731 struct regmap **r = res;
737 /* If the user didn't specify a name match any */
739 return (*r)->name == data;
745 * dev_get_regmap(): Obtain the regmap (if any) for a device
747 * @dev: Device to retrieve the map for
748 * @name: Optional name for the register map, usually NULL.
750 * Returns the regmap for the device if one is present, or NULL. If
751 * name is specified then it must match the name specified when
752 * registering the device, if it is NULL then the first regmap found
753 * will be used. Devices with multiple register maps are very rare,
754 * generic code should normally not need to specify a name.
756 struct regmap *dev_get_regmap(struct device *dev, const char *name)
758 struct regmap **r = devres_find(dev, dev_get_regmap_release,
759 dev_get_regmap_match, (void *)name);
765 EXPORT_SYMBOL_GPL(dev_get_regmap);
767 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
768 struct regmap_range_node *range,
769 unsigned int val_num)
772 unsigned int win_offset;
773 unsigned int win_page;
777 win_offset = (*reg - range->range_min) % range->window_len;
778 win_page = (*reg - range->range_min) / range->window_len;
781 /* Bulk write shouldn't cross range boundary */
782 if (*reg + val_num - 1 > range->range_max)
785 /* ... or single page boundary */
786 if (val_num > range->window_len - win_offset)
790 /* It is possible to have selector register inside data window.
791 In that case, selector register is located on every page and
792 it needs no page switching, when accessed alone. */
794 range->window_start + win_offset != range->selector_reg) {
795 /* Use separate work_buf during page switching */
796 orig_work_buf = map->work_buf;
797 map->work_buf = map->selector_work_buf;
799 ret = _regmap_update_bits(map, range->selector_reg,
800 range->selector_mask,
801 win_page << range->selector_shift,
804 map->work_buf = orig_work_buf;
810 *reg = range->window_start + win_offset;
815 static int _regmap_raw_write(struct regmap *map, unsigned int reg,
816 const void *val, size_t val_len)
818 struct regmap_range_node *range;
819 u8 *u8 = map->work_buf;
825 /* Check for unwritable registers before we start */
826 if (map->writeable_reg)
827 for (i = 0; i < val_len / map->format.val_bytes; i++)
828 if (!map->writeable_reg(map->dev,
829 reg + (i * map->reg_stride)))
832 if (!map->cache_bypass && map->format.parse_val) {
834 int val_bytes = map->format.val_bytes;
835 for (i = 0; i < val_len / val_bytes; i++) {
836 memcpy(map->work_buf, val + (i * val_bytes), val_bytes);
837 ival = map->format.parse_val(map->work_buf);
838 ret = regcache_write(map, reg + (i * map->reg_stride),
842 "Error in caching of register: %u ret: %d\n",
847 if (map->cache_only) {
848 map->cache_dirty = true;
853 range = _regmap_range_lookup(map, reg);
855 int val_num = val_len / map->format.val_bytes;
856 int win_offset = (reg - range->range_min) % range->window_len;
857 int win_residue = range->window_len - win_offset;
859 /* If the write goes beyond the end of the window split it */
860 while (val_num > win_residue) {
861 dev_dbg(map->dev, "Writing window %d/%d\n",
862 win_residue, val_len / map->format.val_bytes);
863 ret = _regmap_raw_write(map, reg, val, win_residue *
864 map->format.val_bytes);
869 val_num -= win_residue;
870 val += win_residue * map->format.val_bytes;
871 val_len -= win_residue * map->format.val_bytes;
873 win_offset = (reg - range->range_min) %
875 win_residue = range->window_len - win_offset;
878 ret = _regmap_select_page(map, ®, range, val_num);
883 map->format.format_reg(map->work_buf, reg, map->reg_shift);
885 u8[0] |= map->write_flag_mask;
887 trace_regmap_hw_write_start(map->dev, reg,
888 val_len / map->format.val_bytes);
890 /* If we're doing a single register write we can probably just
891 * send the work_buf directly, otherwise try to do a gather
894 if (val == (map->work_buf + map->format.pad_bytes +
895 map->format.reg_bytes))
896 ret = map->bus->write(map->bus_context, map->work_buf,
897 map->format.reg_bytes +
898 map->format.pad_bytes +
900 else if (map->bus->gather_write)
901 ret = map->bus->gather_write(map->bus_context, map->work_buf,
902 map->format.reg_bytes +
903 map->format.pad_bytes,
906 /* If that didn't work fall back on linearising by hand. */
907 if (ret == -ENOTSUPP) {
908 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
909 buf = kzalloc(len, GFP_KERNEL);
913 memcpy(buf, map->work_buf, map->format.reg_bytes);
914 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
916 ret = map->bus->write(map->bus_context, buf, len);
921 trace_regmap_hw_write_done(map->dev, reg,
922 val_len / map->format.val_bytes);
927 int _regmap_write(struct regmap *map, unsigned int reg,
930 struct regmap_range_node *range;
932 BUG_ON(!map->format.format_write && !map->format.format_val);
934 if (!map->cache_bypass && map->format.format_write) {
935 ret = regcache_write(map, reg, val);
938 if (map->cache_only) {
939 map->cache_dirty = true;
945 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
946 dev_info(map->dev, "%x <= %x\n", reg, val);
949 trace_regmap_reg_write(map->dev, reg, val);
951 if (map->format.format_write) {
952 range = _regmap_range_lookup(map, reg);
954 ret = _regmap_select_page(map, ®, range, 1);
959 map->format.format_write(map, reg, val);
961 trace_regmap_hw_write_start(map->dev, reg, 1);
963 ret = map->bus->write(map->bus_context, map->work_buf,
964 map->format.buf_size);
966 trace_regmap_hw_write_done(map->dev, reg, 1);
970 map->format.format_val(map->work_buf + map->format.reg_bytes
971 + map->format.pad_bytes, val, 0);
972 return _regmap_raw_write(map, reg,
974 map->format.reg_bytes +
975 map->format.pad_bytes,
976 map->format.val_bytes);
981 * regmap_write(): Write a value to a single register
983 * @map: Register map to write to
984 * @reg: Register to write to
985 * @val: Value to be written
987 * A value of zero will be returned on success, a negative errno will
988 * be returned in error cases.
990 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
994 if (reg % map->reg_stride)
999 ret = _regmap_write(map, reg, val);
1005 EXPORT_SYMBOL_GPL(regmap_write);
1008 * regmap_raw_write(): Write raw values to one or more registers
1010 * @map: Register map to write to
1011 * @reg: Initial register to write to
1012 * @val: Block of data to be written, laid out for direct transmission to the
1014 * @val_len: Length of data pointed to by val.
1016 * This function is intended to be used for things like firmware
1017 * download where a large block of data needs to be transferred to the
1018 * device. No formatting will be done on the data provided.
1020 * A value of zero will be returned on success, a negative errno will
1021 * be returned in error cases.
1023 int regmap_raw_write(struct regmap *map, unsigned int reg,
1024 const void *val, size_t val_len)
1028 if (val_len % map->format.val_bytes)
1030 if (reg % map->reg_stride)
1035 ret = _regmap_raw_write(map, reg, val, val_len);
1041 EXPORT_SYMBOL_GPL(regmap_raw_write);
1044 * regmap_bulk_write(): Write multiple registers to the device
1046 * @map: Register map to write to
1047 * @reg: First register to be write from
1048 * @val: Block of data to be written, in native register size for device
1049 * @val_count: Number of registers to write
1051 * This function is intended to be used for writing a large block of
1052 * data to be device either in single transfer or multiple transfer.
1054 * A value of zero will be returned on success, a negative errno will
1055 * be returned in error cases.
1057 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1061 size_t val_bytes = map->format.val_bytes;
1064 if (!map->format.parse_val)
1066 if (reg % map->reg_stride)
1071 /* No formatting is require if val_byte is 1 */
1072 if (val_bytes == 1) {
1075 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
1078 dev_err(map->dev, "Error in memory allocation\n");
1081 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1082 map->format.parse_val(wval + i);
1085 * Some devices does not support bulk write, for
1086 * them we have a series of single write operations.
1088 if (map->use_single_rw) {
1089 for (i = 0; i < val_count; i++) {
1090 ret = regmap_raw_write(map,
1091 reg + (i * map->reg_stride),
1092 val + (i * val_bytes),
1098 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1108 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1110 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1111 unsigned int val_len)
1113 struct regmap_range_node *range;
1114 u8 *u8 = map->work_buf;
1117 range = _regmap_range_lookup(map, reg);
1119 ret = _regmap_select_page(map, ®, range,
1120 val_len / map->format.val_bytes);
1125 map->format.format_reg(map->work_buf, reg, map->reg_shift);
1128 * Some buses or devices flag reads by setting the high bits in the
1129 * register addresss; since it's always the high bits for all
1130 * current formats we can do this here rather than in
1131 * formatting. This may break if we get interesting formats.
1133 u8[0] |= map->read_flag_mask;
1135 trace_regmap_hw_read_start(map->dev, reg,
1136 val_len / map->format.val_bytes);
1138 ret = map->bus->read(map->bus_context, map->work_buf,
1139 map->format.reg_bytes + map->format.pad_bytes,
1142 trace_regmap_hw_read_done(map->dev, reg,
1143 val_len / map->format.val_bytes);
1148 static int _regmap_read(struct regmap *map, unsigned int reg,
1153 if (!map->cache_bypass) {
1154 ret = regcache_read(map, reg, val);
1159 if (!map->format.parse_val)
1162 if (map->cache_only)
1165 ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
1167 *val = map->format.parse_val(map->work_buf);
1170 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1171 dev_info(map->dev, "%x => %x\n", reg, *val);
1174 trace_regmap_reg_read(map->dev, reg, *val);
1177 if (ret == 0 && !map->cache_bypass)
1178 regcache_write(map, reg, *val);
1184 * regmap_read(): Read a value from a single register
1186 * @map: Register map to write to
1187 * @reg: Register to be read from
1188 * @val: Pointer to store read value
1190 * A value of zero will be returned on success, a negative errno will
1191 * be returned in error cases.
1193 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
1197 if (reg % map->reg_stride)
1202 ret = _regmap_read(map, reg, val);
1208 EXPORT_SYMBOL_GPL(regmap_read);
1211 * regmap_raw_read(): Read raw data from the device
1213 * @map: Register map to write to
1214 * @reg: First register to be read from
1215 * @val: Pointer to store read value
1216 * @val_len: Size of data to read
1218 * A value of zero will be returned on success, a negative errno will
1219 * be returned in error cases.
1221 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1224 size_t val_bytes = map->format.val_bytes;
1225 size_t val_count = val_len / val_bytes;
1229 if (val_len % map->format.val_bytes)
1231 if (reg % map->reg_stride)
1236 if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
1237 map->cache_type == REGCACHE_NONE) {
1238 /* Physical block read if there's no cache involved */
1239 ret = _regmap_raw_read(map, reg, val, val_len);
1242 /* Otherwise go word by word for the cache; should be low
1243 * cost as we expect to hit the cache.
1245 for (i = 0; i < val_count; i++) {
1246 ret = _regmap_read(map, reg + (i * map->reg_stride),
1251 map->format.format_val(val + (i * val_bytes), v, 0);
1260 EXPORT_SYMBOL_GPL(regmap_raw_read);
1263 * regmap_bulk_read(): Read multiple registers from the device
1265 * @map: Register map to write to
1266 * @reg: First register to be read from
1267 * @val: Pointer to store read value, in native register size for device
1268 * @val_count: Number of registers to read
1270 * A value of zero will be returned on success, a negative errno will
1271 * be returned in error cases.
1273 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
1277 size_t val_bytes = map->format.val_bytes;
1278 bool vol = regmap_volatile_range(map, reg, val_count);
1280 if (!map->format.parse_val)
1282 if (reg % map->reg_stride)
1285 if (vol || map->cache_type == REGCACHE_NONE) {
1287 * Some devices does not support bulk read, for
1288 * them we have a series of single read operations.
1290 if (map->use_single_rw) {
1291 for (i = 0; i < val_count; i++) {
1292 ret = regmap_raw_read(map,
1293 reg + (i * map->reg_stride),
1294 val + (i * val_bytes),
1300 ret = regmap_raw_read(map, reg, val,
1301 val_bytes * val_count);
1306 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1307 map->format.parse_val(val + i);
1309 for (i = 0; i < val_count; i++) {
1311 ret = regmap_read(map, reg + (i * map->reg_stride),
1315 memcpy(val + (i * val_bytes), &ival, val_bytes);
1321 EXPORT_SYMBOL_GPL(regmap_bulk_read);
1323 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
1324 unsigned int mask, unsigned int val,
1328 unsigned int tmp, orig;
1330 ret = _regmap_read(map, reg, &orig);
1338 ret = _regmap_write(map, reg, tmp);
1348 * regmap_update_bits: Perform a read/modify/write cycle on the register map
1350 * @map: Register map to update
1351 * @reg: Register to update
1352 * @mask: Bitmask to change
1353 * @val: New value for bitmask
1355 * Returns zero for success, a negative number on error.
1357 int regmap_update_bits(struct regmap *map, unsigned int reg,
1358 unsigned int mask, unsigned int val)
1364 ret = _regmap_update_bits(map, reg, mask, val, &change);
1369 EXPORT_SYMBOL_GPL(regmap_update_bits);
1372 * regmap_update_bits_check: Perform a read/modify/write cycle on the
1373 * register map and report if updated
1375 * @map: Register map to update
1376 * @reg: Register to update
1377 * @mask: Bitmask to change
1378 * @val: New value for bitmask
1379 * @change: Boolean indicating if a write was done
1381 * Returns zero for success, a negative number on error.
1383 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
1384 unsigned int mask, unsigned int val,
1390 ret = _regmap_update_bits(map, reg, mask, val, change);
1394 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
1397 * regmap_register_patch: Register and apply register updates to be applied
1398 * on device initialistion
1400 * @map: Register map to apply updates to.
1401 * @regs: Values to update.
1402 * @num_regs: Number of entries in regs.
1404 * Register a set of register updates to be applied to the device
1405 * whenever the device registers are synchronised with the cache and
1406 * apply them immediately. Typically this is used to apply
1407 * corrections to be applied to the device defaults on startup, such
1408 * as the updates some vendors provide to undocumented registers.
1410 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
1416 /* If needed the implementation can be extended to support this */
1422 bypass = map->cache_bypass;
1424 map->cache_bypass = true;
1426 /* Write out first; it's useful to apply even if we fail later. */
1427 for (i = 0; i < num_regs; i++) {
1428 ret = _regmap_write(map, regs[i].reg, regs[i].def);
1430 dev_err(map->dev, "Failed to write %x = %x: %d\n",
1431 regs[i].reg, regs[i].def, ret);
1436 map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL);
1437 if (map->patch != NULL) {
1438 memcpy(map->patch, regs,
1439 num_regs * sizeof(struct reg_default));
1440 map->patch_regs = num_regs;
1446 map->cache_bypass = bypass;
1452 EXPORT_SYMBOL_GPL(regmap_register_patch);
1455 * regmap_get_val_bytes(): Report the size of a register value
1457 * Report the size of a register value, mainly intended to for use by
1458 * generic infrastructure built on top of regmap.
1460 int regmap_get_val_bytes(struct regmap *map)
1462 if (map->format.format_write)
1465 return map->format.val_bytes;
1467 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
1469 static int __init regmap_initcall(void)
1471 regmap_debugfs_initcall();
1475 postcore_initcall(regmap_initcall);