drivers/base/regmap/regmap.c

   1 /*
   2  * Register map access API
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   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.
  11  */
  12
  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/of.h>
  19 #include <linux/rbtree.h>
  20 #include <linux/sched.h>
  21 #include <linux/delay.h>
  22 #include <linux/log2.h>
  23 #include <linux/hwspinlock.h>
  24
  25 #define CREATE_TRACE_POINTS
  26 #include "trace.h"
  27
  28 #include "internal.h"
  29
  30 /*
  31  * Sometimes for failures during very early init the trace
  32  * infrastructure isn't available early enough to be used.  For this
  33  * sort of problem defining LOG_DEVICE will add printks for basic
  34  * register I/O on a specific device.
  35  */
  36 #undef LOG_DEVICE
  37
  38 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
  39                                unsigned int mask, unsigned int val,
  40                                bool *change, bool force_write);
  41
  42 static int _regmap_bus_reg_read(void *context, unsigned int reg,
  43                                 unsigned int *val);
  44 static int _regmap_bus_read(void *context, unsigned int reg,
  45                             unsigned int *val);
  46 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
  47                                        unsigned int val);
  48 static int _regmap_bus_reg_write(void *context, unsigned int reg,
  49                                  unsigned int val);
  50 static int _regmap_bus_raw_write(void *context, unsigned int reg,
  51                                  unsigned int val);
  52
  53 bool regmap_reg_in_ranges(unsigned int reg,
  54                           const struct regmap_range *ranges,
  55                           unsigned int nranges)
  56 {
  57         const struct regmap_range *r;
  58         int i;
  59
  60         for (i = 0, r = ranges; i < nranges; i++, r++)
  61                 if (regmap_reg_in_range(reg, r))
  62                         return true;
  63         return false;
  64 }
  65 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
  66
  67 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
  68                               const struct regmap_access_table *table)
  69 {
  70         /* Check "no ranges" first */
  71         if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
  72                 return false;
  73
  74         /* In case zero "yes ranges" are supplied, any reg is OK */
  75         if (!table->n_yes_ranges)
  76                 return true;
  77
  78         return regmap_reg_in_ranges(reg, table->yes_ranges,
  79                                     table->n_yes_ranges);
  80 }
  81 EXPORT_SYMBOL_GPL(regmap_check_range_table);
  82
  83 bool regmap_writeable(struct regmap *map, unsigned int reg)
  84 {
  85         if (map->max_register && reg > map->max_register)
  86                 return false;
  87
  88         if (map->writeable_reg)
  89                 return map->writeable_reg(map->dev, reg);
  90
  91         if (map->wr_table)
  92                 return regmap_check_range_table(map, reg, map->wr_table);
  93
  94         return true;
  95 }
  96
  97 bool regmap_cached(struct regmap *map, unsigned int reg)
  98 {
  99         int ret;
 100         unsigned int val;
 101
 102         if (map->cache_type == REGCACHE_NONE)
 103                 return false;
 104
 105         if (!map->cache_ops)
 106                 return false;
 107
 108         if (map->max_register && reg > map->max_register)
 109                 return false;
 110
 111         map->lock(map->lock_arg);
 112         ret = regcache_read(map, reg, &val);
 113         map->unlock(map->lock_arg);
 114         if (ret)
 115                 return false;
 116
 117         return true;
 118 }
 119
 120 bool regmap_readable(struct regmap *map, unsigned int reg)
 121 {
 122         if (!map->reg_read)
 123                 return false;
 124
 125         if (map->max_register && reg > map->max_register)
 126                 return false;
 127
 128         if (map->format.format_write)
 129                 return false;
 130
 131         if (map->readable_reg)
 132                 return map->readable_reg(map->dev, reg);
 133
 134         if (map->rd_table)
 135                 return regmap_check_range_table(map, reg, map->rd_table);
 136
 137         return true;
 138 }
 139
 140 bool regmap_volatile(struct regmap *map, unsigned int reg)
 141 {
 142         if (!map->format.format_write && !regmap_readable(map, reg))
 143                 return false;
 144
 145         if (map->volatile_reg)
 146                 return map->volatile_reg(map->dev, reg);
 147
 148         if (map->volatile_table)
 149                 return regmap_check_range_table(map, reg, map->volatile_table);
 150
 151         if (map->cache_ops)
 152                 return false;
 153         else
 154                 return true;
 155 }
 156
 157 bool regmap_precious(struct regmap *map, unsigned int reg)
 158 {
 159         if (!regmap_readable(map, reg))
 160                 return false;
 161
 162         if (map->precious_reg)
 163                 return map->precious_reg(map->dev, reg);
 164
 165         if (map->precious_table)
 166                 return regmap_check_range_table(map, reg, map->precious_table);
 167
 168         return false;
 169 }
 170
 171 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
 172         size_t num)
 173 {
 174         unsigned int i;
 175
 176         for (i = 0; i < num; i++)
 177                 if (!regmap_volatile(map, reg + regmap_get_offset(map, i)))
 178                         return false;
 179
 180         return true;
 181 }
 182
 183 static void regmap_format_2_6_write(struct regmap *map,
 184                                      unsigned int reg, unsigned int val)
 185 {
 186         u8 *out = map->work_buf;
 187
 188         *out = (reg << 6) | val;
 189 }
 190
 191 static void regmap_format_4_12_write(struct regmap *map,
 192                                      unsigned int reg, unsigned int val)
 193 {
 194         __be16 *out = map->work_buf;
 195         *out = cpu_to_be16((reg << 12) | val);
 196 }
 197
 198 static void regmap_format_7_9_write(struct regmap *map,
 199                                     unsigned int reg, unsigned int val)
 200 {
 201         __be16 *out = map->work_buf;
 202         *out = cpu_to_be16((reg << 9) | val);
 203 }
 204
 205 static void regmap_format_10_14_write(struct regmap *map,
 206                                     unsigned int reg, unsigned int val)
 207 {
 208         u8 *out = map->work_buf;
 209
 210         out[2] = val;
 211         out[1] = (val >> 8) | (reg << 6);
 212         out[0] = reg >> 2;
 213 }
 214
 215 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 216 {
 217         u8 *b = buf;
 218
 219         b[0] = val << shift;
 220 }
 221
 222 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
 223 {
 224         __be16 *b = buf;
 225
 226         b[0] = cpu_to_be16(val << shift);
 227 }
 228
 229 static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
 230 {
 231         __le16 *b = buf;
 232
 233         b[0] = cpu_to_le16(val << shift);
 234 }
 235
 236 static void regmap_format_16_native(void *buf, unsigned int val,
 237                                     unsigned int shift)
 238 {
 239         *(u16 *)buf = val << shift;
 240 }
 241
 242 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 243 {
 244         u8 *b = buf;
 245
 246         val <<= shift;
 247
 248         b[0] = val >> 16;
 249         b[1] = val >> 8;
 250         b[2] = val;
 251 }
 252
 253 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
 254 {
 255         __be32 *b = buf;
 256
 257         b[0] = cpu_to_be32(val << shift);
 258 }
 259
 260 static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
 261 {
 262         __le32 *b = buf;
 263
 264         b[0] = cpu_to_le32(val << shift);
 265 }
 266
 267 static void regmap_format_32_native(void *buf, unsigned int val,
 268                                     unsigned int shift)
 269 {
 270         *(u32 *)buf = val << shift;
 271 }
 272
 273 #ifdef CONFIG_64BIT
 274 static void regmap_format_64_be(void *buf, unsigned int val, unsigned int shift)
 275 {
 276         __be64 *b = buf;
 277
 278         b[0] = cpu_to_be64((u64)val << shift);
 279 }
 280
 281 static void regmap_format_64_le(void *buf, unsigned int val, unsigned int shift)
 282 {
 283         __le64 *b = buf;
 284
 285         b[0] = cpu_to_le64((u64)val << shift);
 286 }
 287
 288 static void regmap_format_64_native(void *buf, unsigned int val,
 289                                     unsigned int shift)
 290 {
 291         *(u64 *)buf = (u64)val << shift;
 292 }
 293 #endif
 294
 295 static void regmap_parse_inplace_noop(void *buf)
 296 {
 297 }
 298
 299 static unsigned int regmap_parse_8(const void *buf)
 300 {
 301         const u8 *b = buf;
 302
 303         return b[0];
 304 }
 305
 306 static unsigned int regmap_parse_16_be(const void *buf)
 307 {
 308         const __be16 *b = buf;
 309
 310         return be16_to_cpu(b[0]);
 311 }
 312
 313 static unsigned int regmap_parse_16_le(const void *buf)
 314 {
 315         const __le16 *b = buf;
 316
 317         return le16_to_cpu(b[0]);
 318 }
 319
 320 static void regmap_parse_16_be_inplace(void *buf)
 321 {
 322         __be16 *b = buf;
 323
 324         b[0] = be16_to_cpu(b[0]);
 325 }
 326
 327 static void regmap_parse_16_le_inplace(void *buf)
 328 {
 329         __le16 *b = buf;
 330
 331         b[0] = le16_to_cpu(b[0]);
 332 }
 333
 334 static unsigned int regmap_parse_16_native(const void *buf)
 335 {
 336         return *(u16 *)buf;
 337 }
 338
 339 static unsigned int regmap_parse_24(const void *buf)
 340 {
 341         const u8 *b = buf;
 342         unsigned int ret = b[2];
 343         ret |= ((unsigned int)b[1]) << 8;
 344         ret |= ((unsigned int)b[0]) << 16;
 345
 346         return ret;
 347 }
 348
 349 static unsigned int regmap_parse_32_be(const void *buf)
 350 {
 351         const __be32 *b = buf;
 352
 353         return be32_to_cpu(b[0]);
 354 }
 355
 356 static unsigned int regmap_parse_32_le(const void *buf)
 357 {
 358         const __le32 *b = buf;
 359
 360         return le32_to_cpu(b[0]);
 361 }
 362
 363 static void regmap_parse_32_be_inplace(void *buf)
 364 {
 365         __be32 *b = buf;
 366
 367         b[0] = be32_to_cpu(b[0]);
 368 }
 369
 370 static void regmap_parse_32_le_inplace(void *buf)
 371 {
 372         __le32 *b = buf;
 373
 374         b[0] = le32_to_cpu(b[0]);
 375 }
 376
 377 static unsigned int regmap_parse_32_native(const void *buf)
 378 {
 379         return *(u32 *)buf;
 380 }
 381
 382 #ifdef CONFIG_64BIT
 383 static unsigned int regmap_parse_64_be(const void *buf)
 384 {
 385         const __be64 *b = buf;
 386
 387         return be64_to_cpu(b[0]);
 388 }
 389
 390 static unsigned int regmap_parse_64_le(const void *buf)
 391 {
 392         const __le64 *b = buf;
 393
 394         return le64_to_cpu(b[0]);
 395 }
 396
 397 static void regmap_parse_64_be_inplace(void *buf)
 398 {
 399         __be64 *b = buf;
 400
 401         b[0] = be64_to_cpu(b[0]);
 402 }
 403
 404 static void regmap_parse_64_le_inplace(void *buf)
 405 {
 406         __le64 *b = buf;
 407
 408         b[0] = le64_to_cpu(b[0]);
 409 }
 410
 411 static unsigned int regmap_parse_64_native(const void *buf)
 412 {
 413         return *(u64 *)buf;
 414 }
 415 #endif
 416
 417 static void regmap_lock_hwlock(void *__map)
 418 {
 419         struct regmap *map = __map;
 420
 421         hwspin_lock_timeout(map->hwlock, UINT_MAX);
 422 }
 423
 424 static void regmap_lock_hwlock_irq(void *__map)
 425 {
 426         struct regmap *map = __map;
 427
 428         hwspin_lock_timeout_irq(map->hwlock, UINT_MAX);
 429 }
 430
 431 static void regmap_lock_hwlock_irqsave(void *__map)
 432 {
 433         struct regmap *map = __map;
 434
 435         hwspin_lock_timeout_irqsave(map->hwlock, UINT_MAX,
 436                                     &map->spinlock_flags);
 437 }
 438
 439 static void regmap_unlock_hwlock(void *__map)
 440 {
 441         struct regmap *map = __map;
 442
 443         hwspin_unlock(map->hwlock);
 444 }
 445
 446 static void regmap_unlock_hwlock_irq(void *__map)
 447 {
 448         struct regmap *map = __map;
 449
 450         hwspin_unlock_irq(map->hwlock);
 451 }
 452
 453 static void regmap_unlock_hwlock_irqrestore(void *__map)
 454 {
 455         struct regmap *map = __map;
 456
 457         hwspin_unlock_irqrestore(map->hwlock, &map->spinlock_flags);
 458 }
 459
 460 static void regmap_lock_unlock_none(void *__map)
 461 {
 462
 463 }
 464
 465 static void regmap_lock_mutex(void *__map)
 466 {
 467         struct regmap *map = __map;
 468         mutex_lock(&map->mutex);
 469 }
 470
 471 static void regmap_unlock_mutex(void *__map)
 472 {
 473         struct regmap *map = __map;
 474         mutex_unlock(&map->mutex);
 475 }
 476
 477 static void regmap_lock_spinlock(void *__map)
 478 __acquires(&map->spinlock)
 479 {
 480         struct regmap *map = __map;
 481         unsigned long flags;
 482
 483         spin_lock_irqsave(&map->spinlock, flags);
 484         map->spinlock_flags = flags;
 485 }
 486
 487 static void regmap_unlock_spinlock(void *__map)
 488 __releases(&map->spinlock)
 489 {
 490         struct regmap *map = __map;
 491         spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
 492 }
 493
 494 static void dev_get_regmap_release(struct device *dev, void *res)
 495 {
 496         /*
 497          * We don't actually have anything to do here; the goal here
 498          * is not to manage the regmap but to provide a simple way to
 499          * get the regmap back given a struct device.
 500          */
 501 }
 502
 503 static bool _regmap_range_add(struct regmap *map,
 504                               struct regmap_range_node *data)
 505 {
 506         struct rb_root *root = &map->range_tree;
 507         struct rb_node **new = &(root->rb_node), *parent = NULL;
 508
 509         while (*new) {
 510                 struct regmap_range_node *this =
 511                         rb_entry(*new, struct regmap_range_node, node);
 512
 513                 parent = *new;
 514                 if (data->range_max < this->range_min)
 515                         new = &((*new)->rb_left);
 516                 else if (data->range_min > this->range_max)
 517                         new = &((*new)->rb_right);
 518                 else
 519                         return false;
 520         }
 521
 522         rb_link_node(&data->node, parent, new);
 523         rb_insert_color(&data->node, root);
 524
 525         return true;
 526 }
 527
 528 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
 529                                                       unsigned int reg)
 530 {
 531         struct rb_node *node = map->range_tree.rb_node;
 532
 533         while (node) {
 534                 struct regmap_range_node *this =
 535                         rb_entry(node, struct regmap_range_node, node);
 536
 537                 if (reg < this->range_min)
 538                         node = node->rb_left;
 539                 else if (reg > this->range_max)
 540                         node = node->rb_right;
 541                 else
 542                         return this;
 543         }
 544
 545         return NULL;
 546 }
 547
 548 static void regmap_range_exit(struct regmap *map)
 549 {
 550         struct rb_node *next;
 551         struct regmap_range_node *range_node;
 552
 553         next = rb_first(&map->range_tree);
 554         while (next) {
 555                 range_node = rb_entry(next, struct regmap_range_node, node);
 556                 next = rb_next(&range_node->node);
 557                 rb_erase(&range_node->node, &map->range_tree);
 558                 kfree(range_node);
 559         }
 560
 561         kfree(map->selector_work_buf);
 562 }
 563
 564 int regmap_attach_dev(struct device *dev, struct regmap *map,
 565                       const struct regmap_config *config)
 566 {
 567         struct regmap **m;
 568
 569         map->dev = dev;
 570
 571         regmap_debugfs_init(map, config->name);
 572
 573         /* Add a devres resource for dev_get_regmap() */
 574         m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
 575         if (!m) {
 576                 regmap_debugfs_exit(map);
 577                 return -ENOMEM;
 578         }
 579         *m = map;
 580         devres_add(dev, m);
 581
 582         return 0;
 583 }
 584 EXPORT_SYMBOL_GPL(regmap_attach_dev);
 585
 586 static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
 587                                         const struct regmap_config *config)
 588 {
 589         enum regmap_endian endian;
 590
 591         /* Retrieve the endianness specification from the regmap config */
 592         endian = config->reg_format_endian;
 593
 594         /* If the regmap config specified a non-default value, use that */
 595         if (endian != REGMAP_ENDIAN_DEFAULT)
 596                 return endian;
 597
 598         /* Retrieve the endianness specification from the bus config */
 599         if (bus && bus->reg_format_endian_default)
 600                 endian = bus->reg_format_endian_default;
 601
 602         /* If the bus specified a non-default value, use that */
 603         if (endian != REGMAP_ENDIAN_DEFAULT)
 604                 return endian;
 605
 606         /* Use this if no other value was found */
 607         return REGMAP_ENDIAN_BIG;
 608 }
 609
 610 enum regmap_endian regmap_get_val_endian(struct device *dev,
 611                                          const struct regmap_bus *bus,
 612                                          const struct regmap_config *config)
 613 {
 614         struct device_node *np;
 615         enum regmap_endian endian;
 616
 617         /* Retrieve the endianness specification from the regmap config */
 618         endian = config->val_format_endian;
 619
 620         /* If the regmap config specified a non-default value, use that */
 621         if (endian != REGMAP_ENDIAN_DEFAULT)
 622                 return endian;
 623
 624         /* If the dev and dev->of_node exist try to get endianness from DT */
 625         if (dev && dev->of_node) {
 626                 np = dev->of_node;
 627
 628                 /* Parse the device's DT node for an endianness specification */
 629                 if (of_property_read_bool(np, "big-endian"))
 630                         endian = REGMAP_ENDIAN_BIG;
 631                 else if (of_property_read_bool(np, "little-endian"))
 632                         endian = REGMAP_ENDIAN_LITTLE;
 633                 else if (of_property_read_bool(np, "native-endian"))
 634                         endian = REGMAP_ENDIAN_NATIVE;
 635
 636                 /* If the endianness was specified in DT, use that */
 637                 if (endian != REGMAP_ENDIAN_DEFAULT)
 638                         return endian;
 639         }
 640
 641         /* Retrieve the endianness specification from the bus config */
 642         if (bus && bus->val_format_endian_default)
 643                 endian = bus->val_format_endian_default;
 644
 645         /* If the bus specified a non-default value, use that */
 646         if (endian != REGMAP_ENDIAN_DEFAULT)
 647                 return endian;
 648
 649         /* Use this if no other value was found */
 650         return REGMAP_ENDIAN_BIG;
 651 }
 652 EXPORT_SYMBOL_GPL(regmap_get_val_endian);
 653
 654 struct regmap *__regmap_init(struct device *dev,
 655                              const struct regmap_bus *bus,
 656                              void *bus_context,
 657                              const struct regmap_config *config,
 658                              struct lock_class_key *lock_key,
 659                              const char *lock_name)
 660 {
 661         struct regmap *map;
 662         int ret = -EINVAL;
 663         enum regmap_endian reg_endian, val_endian;
 664         int i, j;
 665
 666         if (!config)
 667                 goto err;
 668
 669         map = kzalloc(sizeof(*map), GFP_KERNEL);
 670         if (map == NULL) {
 671                 ret = -ENOMEM;
 672                 goto err;
 673         }
 674
 675         if (config->name) {
 676                 map->name = kstrdup_const(config->name, GFP_KERNEL);
 677                 if (!map->name) {
 678                         ret = -ENOMEM;
 679                         goto err_map;
 680                 }
 681         }
 682
 683         if (config->disable_locking) {
 684                 map->lock = map->unlock = regmap_lock_unlock_none;
 685                 regmap_debugfs_disable(map);
 686         } else if (config->lock && config->unlock) {
 687                 map->lock = config->lock;
 688                 map->unlock = config->unlock;
 689                 map->lock_arg = config->lock_arg;
 690         } else if (config->use_hwlock) {
 691                 map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
 692                 if (!map->hwlock) {
 693                         ret = -ENXIO;
 694                         goto err_name;
 695                 }
 696
 697                 switch (config->hwlock_mode) {
 698                 case HWLOCK_IRQSTATE:
 699                         map->lock = regmap_lock_hwlock_irqsave;
 700                         map->unlock = regmap_unlock_hwlock_irqrestore;
 701                         break;
 702                 case HWLOCK_IRQ:
 703                         map->lock = regmap_lock_hwlock_irq;
 704                         map->unlock = regmap_unlock_hwlock_irq;
 705                         break;
 706                 default:
 707                         map->lock = regmap_lock_hwlock;
 708                         map->unlock = regmap_unlock_hwlock;
 709                         break;
 710                 }
 711
 712                 map->lock_arg = map;
 713         } else {
 714                 if ((bus && bus->fast_io) ||
 715                     config->fast_io) {
 716                         spin_lock_init(&map->spinlock);
 717                         map->lock = regmap_lock_spinlock;
 718                         map->unlock = regmap_unlock_spinlock;
 719                         lockdep_set_class_and_name(&map->spinlock,
 720                                                    lock_key, lock_name);
 721                 } else {
 722                         mutex_init(&map->mutex);
 723                         map->lock = regmap_lock_mutex;
 724                         map->unlock = regmap_unlock_mutex;
 725                         lockdep_set_class_and_name(&map->mutex,
 726                                                    lock_key, lock_name);
 727                 }
 728                 map->lock_arg = map;
 729         }
 730
 731         /*
 732          * When we write in fast-paths with regmap_bulk_write() don't allocate
 733          * scratch buffers with sleeping allocations.
 734          */
 735         if ((bus && bus->fast_io) || config->fast_io)
 736                 map->alloc_flags = GFP_ATOMIC;
 737         else
 738                 map->alloc_flags = GFP_KERNEL;
 739
 740         map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 741         map->format.pad_bytes = config->pad_bits / 8;
 742         map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 743         map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
 744                         config->val_bits + config->pad_bits, 8);
 745         map->reg_shift = config->pad_bits % 8;
 746         if (config->reg_stride)
 747                 map->reg_stride = config->reg_stride;
 748         else
 749                 map->reg_stride = 1;
 750         if (is_power_of_2(map->reg_stride))
 751                 map->reg_stride_order = ilog2(map->reg_stride);
 752         else
 753                 map->reg_stride_order = -1;
 754         map->use_single_read = config->use_single_rw || !bus || !bus->read;
 755         map->use_single_write = config->use_single_rw || !bus || !bus->write;
 756         map->can_multi_write = config->can_multi_write && bus && bus->write;
 757         if (bus) {
 758                 map->max_raw_read = bus->max_raw_read;
 759                 map->max_raw_write = bus->max_raw_write;
 760         }
 761         map->dev = dev;
 762         map->bus = bus;
 763         map->bus_context = bus_context;
 764         map->max_register = config->max_register;
 765         map->wr_table = config->wr_table;
 766         map->rd_table = config->rd_table;
 767         map->volatile_table = config->volatile_table;
 768         map->precious_table = config->precious_table;
 769         map->writeable_reg = config->writeable_reg;
 770         map->readable_reg = config->readable_reg;
 771         map->volatile_reg = config->volatile_reg;
 772         map->precious_reg = config->precious_reg;
 773         map->cache_type = config->cache_type;
 774
 775         spin_lock_init(&map->async_lock);
 776         INIT_LIST_HEAD(&map->async_list);
 777         INIT_LIST_HEAD(&map->async_free);
 778         init_waitqueue_head(&map->async_waitq);
 779
 780         if (config->read_flag_mask ||
 781             config->write_flag_mask ||
 782             config->zero_flag_mask) {
 783                 map->read_flag_mask = config->read_flag_mask;
 784                 map->write_flag_mask = config->write_flag_mask;
 785         } else if (bus) {
 786                 map->read_flag_mask = bus->read_flag_mask;
 787         }
 788
 789         if (!bus) {
 790                 map->reg_read  = config->reg_read;
 791                 map->reg_write = config->reg_write;
 792
 793                 map->defer_caching = false;
 794                 goto skip_format_initialization;
 795         } else if (!bus->read || !bus->write) {
 796                 map->reg_read = _regmap_bus_reg_read;
 797                 map->reg_write = _regmap_bus_reg_write;
 798
 799                 map->defer_caching = false;
 800                 goto skip_format_initialization;
 801         } else {
 802                 map->reg_read  = _regmap_bus_read;
 803                 map->reg_update_bits = bus->reg_update_bits;
 804         }
 805
 806         reg_endian = regmap_get_reg_endian(bus, config);
 807         val_endian = regmap_get_val_endian(dev, bus, config);
 808
 809         switch (config->reg_bits + map->reg_shift) {
 810         case 2:
 811                 switch (config->val_bits) {
 812                 case 6:
 813                         map->format.format_write = regmap_format_2_6_write;
 814                         break;
 815                 default:
 816                         goto err_hwlock;
 817                 }
 818                 break;
 819
 820         case 4:
 821                 switch (config->val_bits) {
 822                 case 12:
 823                         map->format.format_write = regmap_format_4_12_write;
 824                         break;
 825                 default:
 826                         goto err_hwlock;
 827                 }
 828                 break;
 829
 830         case 7:
 831                 switch (config->val_bits) {
 832                 case 9:
 833                         map->format.format_write = regmap_format_7_9_write;
 834                         break;
 835                 default:
 836                         goto err_hwlock;
 837                 }
 838                 break;
 839
 840         case 10:
 841                 switch (config->val_bits) {
 842                 case 14:
 843                         map->format.format_write = regmap_format_10_14_write;
 844                         break;
 845                 default:
 846                         goto err_hwlock;
 847                 }
 848                 break;
 849
 850         case 8:
 851                 map->format.format_reg = regmap_format_8;
 852                 break;
 853
 854         case 16:
 855                 switch (reg_endian) {
 856                 case REGMAP_ENDIAN_BIG:
 857                         map->format.format_reg = regmap_format_16_be;
 858                         break;
 859                 case REGMAP_ENDIAN_LITTLE:
 860                         map->format.format_reg = regmap_format_16_le;
 861                         break;
 862                 case REGMAP_ENDIAN_NATIVE:
 863                         map->format.format_reg = regmap_format_16_native;
 864                         break;
 865                 default:
 866                         goto err_hwlock;
 867                 }
 868                 break;
 869
 870         case 24:
 871                 if (reg_endian != REGMAP_ENDIAN_BIG)
 872                         goto err_hwlock;
 873                 map->format.format_reg = regmap_format_24;
 874                 break;
 875
 876         case 32:
 877                 switch (reg_endian) {
 878                 case REGMAP_ENDIAN_BIG:
 879                         map->format.format_reg = regmap_format_32_be;
 880                         break;
 881                 case REGMAP_ENDIAN_LITTLE:
 882                         map->format.format_reg = regmap_format_32_le;
 883                         break;
 884                 case REGMAP_ENDIAN_NATIVE:
 885                         map->format.format_reg = regmap_format_32_native;
 886                         break;
 887                 default:
 888                         goto err_hwlock;
 889                 }
 890                 break;
 891
 892 #ifdef CONFIG_64BIT
 893         case 64:
 894                 switch (reg_endian) {
 895                 case REGMAP_ENDIAN_BIG:
 896                         map->format.format_reg = regmap_format_64_be;
 897                         break;
 898                 case REGMAP_ENDIAN_LITTLE:
 899                         map->format.format_reg = regmap_format_64_le;
 900                         break;
 901                 case REGMAP_ENDIAN_NATIVE:
 902                         map->format.format_reg = regmap_format_64_native;
 903                         break;
 904                 default:
 905                         goto err_hwlock;
 906                 }
 907                 break;
 908 #endif
 909
 910         default:
 911                 goto err_hwlock;
 912         }
 913
 914         if (val_endian == REGMAP_ENDIAN_NATIVE)
 915                 map->format.parse_inplace = regmap_parse_inplace_noop;
 916
 917         switch (config->val_bits) {
 918         case 8:
 919                 map->format.format_val = regmap_format_8;
 920                 map->format.parse_val = regmap_parse_8;
 921                 map->format.parse_inplace = regmap_parse_inplace_noop;
 922                 break;
 923         case 16:
 924                 switch (val_endian) {
 925                 case REGMAP_ENDIAN_BIG:
 926                         map->format.format_val = regmap_format_16_be;
 927                         map->format.parse_val = regmap_parse_16_be;
 928                         map->format.parse_inplace = regmap_parse_16_be_inplace;
 929                         break;
 930                 case REGMAP_ENDIAN_LITTLE:
 931                         map->format.format_val = regmap_format_16_le;
 932                         map->format.parse_val = regmap_parse_16_le;
 933                         map->format.parse_inplace = regmap_parse_16_le_inplace;
 934                         break;
 935                 case REGMAP_ENDIAN_NATIVE:
 936                         map->format.format_val = regmap_format_16_native;
 937                         map->format.parse_val = regmap_parse_16_native;
 938                         break;
 939                 default:
 940                         goto err_hwlock;
 941                 }
 942                 break;
 943         case 24:
 944                 if (val_endian != REGMAP_ENDIAN_BIG)
 945                         goto err_hwlock;
 946                 map->format.format_val = regmap_format_24;
 947                 map->format.parse_val = regmap_parse_24;
 948                 break;
 949         case 32:
 950                 switch (val_endian) {
 951                 case REGMAP_ENDIAN_BIG:
 952                         map->format.format_val = regmap_format_32_be;
 953                         map->format.parse_val = regmap_parse_32_be;
 954                         map->format.parse_inplace = regmap_parse_32_be_inplace;
 955                         break;
 956                 case REGMAP_ENDIAN_LITTLE:
 957                         map->format.format_val = regmap_format_32_le;
 958                         map->format.parse_val = regmap_parse_32_le;
 959                         map->format.parse_inplace = regmap_parse_32_le_inplace;
 960                         break;
 961                 case REGMAP_ENDIAN_NATIVE:
 962                         map->format.format_val = regmap_format_32_native;
 963                         map->format.parse_val = regmap_parse_32_native;
 964                         break;
 965                 default:
 966                         goto err_hwlock;
 967                 }
 968                 break;
 969 #ifdef CONFIG_64BIT
 970         case 64:
 971                 switch (val_endian) {
 972                 case REGMAP_ENDIAN_BIG:
 973                         map->format.format_val = regmap_format_64_be;
 974                         map->format.parse_val = regmap_parse_64_be;
 975                         map->format.parse_inplace = regmap_parse_64_be_inplace;
 976                         break;
 977                 case REGMAP_ENDIAN_LITTLE:
 978                         map->format.format_val = regmap_format_64_le;
 979                         map->format.parse_val = regmap_parse_64_le;
 980                         map->format.parse_inplace = regmap_parse_64_le_inplace;
 981                         break;
 982                 case REGMAP_ENDIAN_NATIVE:
 983                         map->format.format_val = regmap_format_64_native;
 984                         map->format.parse_val = regmap_parse_64_native;
 985                         break;
 986                 default:
 987                         goto err_hwlock;
 988                 }
 989                 break;
 990 #endif
 991         }
 992
 993         if (map->format.format_write) {
 994                 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
 995                     (val_endian != REGMAP_ENDIAN_BIG))
 996                         goto err_hwlock;
 997                 map->use_single_write = true;
 998         }
 999
1000         if (!map->format.format_write &&
1001             !(map->format.format_reg && map->format.format_val))
1002                 goto err_hwlock;
1003
1004         map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
1005         if (map->work_buf == NULL) {
1006                 ret = -ENOMEM;
1007                 goto err_hwlock;
1008         }
1009
1010         if (map->format.format_write) {
1011                 map->defer_caching = false;
1012                 map->reg_write = _regmap_bus_formatted_write;
1013         } else if (map->format.format_val) {
1014                 map->defer_caching = true;
1015                 map->reg_write = _regmap_bus_raw_write;
1016         }
1017
1018 skip_format_initialization:
1019
1020         map->range_tree = RB_ROOT;
1021         for (i = 0; i < config->num_ranges; i++) {
1022                 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
1023                 struct regmap_range_node *new;
1024
1025                 /* Sanity check */
1026                 if (range_cfg->range_max < range_cfg->range_min) {
1027                         dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
1028                                 range_cfg->range_max, range_cfg->range_min);
1029                         goto err_range;
1030                 }
1031
1032                 if (range_cfg->range_max > map->max_register) {
1033                         dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
1034                                 range_cfg->range_max, map->max_register);
1035                         goto err_range;
1036                 }
1037
1038                 if (range_cfg->selector_reg > map->max_register) {
1039                         dev_err(map->dev,
1040                                 "Invalid range %d: selector out of map\n", i);
1041                         goto err_range;
1042                 }
1043
1044                 if (range_cfg->window_len == 0) {
1045                         dev_err(map->dev, "Invalid range %d: window_len 0\n",
1046                                 i);
1047                         goto err_range;
1048                 }
1049
1050                 /* Make sure, that this register range has no selector
1051                    or data window within its boundary */
1052                 for (j = 0; j < config->num_ranges; j++) {
1053                         unsigned sel_reg = config->ranges[j].selector_reg;
1054                         unsigned win_min = config->ranges[j].window_start;
1055                         unsigned win_max = win_min +
1056                                            config->ranges[j].window_len - 1;
1057
1058                         /* Allow data window inside its own virtual range */
1059                         if (j == i)
1060                                 continue;
1061
1062                         if (range_cfg->range_min <= sel_reg &&
1063                             sel_reg <= range_cfg->range_max) {
1064                                 dev_err(map->dev,
1065                                         "Range %d: selector for %d in window\n",
1066                                         i, j);
1067                                 goto err_range;
1068                         }
1069
1070                         if (!(win_max < range_cfg->range_min ||
1071                               win_min > range_cfg->range_max)) {
1072                                 dev_err(map->dev,
1073                                         "Range %d: window for %d in window\n",
1074                                         i, j);
1075                                 goto err_range;
1076                         }
1077                 }
1078
1079                 new = kzalloc(sizeof(*new), GFP_KERNEL);
1080                 if (new == NULL) {
1081                         ret = -ENOMEM;
1082                         goto err_range;
1083                 }
1084
1085                 new->map = map;
1086                 new->name = range_cfg->name;
1087                 new->range_min = range_cfg->range_min;
1088                 new->range_max = range_cfg->range_max;
1089                 new->selector_reg = range_cfg->selector_reg;
1090                 new->selector_mask = range_cfg->selector_mask;
1091                 new->selector_shift = range_cfg->selector_shift;
1092                 new->window_start = range_cfg->window_start;
1093                 new->window_len = range_cfg->window_len;
1094
1095                 if (!_regmap_range_add(map, new)) {
1096                         dev_err(map->dev, "Failed to add range %d\n", i);
1097                         kfree(new);
1098                         goto err_range;
1099                 }
1100
1101                 if (map->selector_work_buf == NULL) {
1102                         map->selector_work_buf =
1103                                 kzalloc(map->format.buf_size, GFP_KERNEL);
1104                         if (map->selector_work_buf == NULL) {
1105                                 ret = -ENOMEM;
1106                                 goto err_range;
1107                         }
1108                 }
1109         }
1110
1111         ret = regcache_init(map, config);
1112         if (ret != 0)
1113                 goto err_range;
1114
1115         if (dev) {
1116                 ret = regmap_attach_dev(dev, map, config);
1117                 if (ret != 0)
1118                         goto err_regcache;
1119         } else {
1120                 regmap_debugfs_init(map, config->name);
1121         }
1122
1123         return map;
1124
1125 err_regcache:
1126         regcache_exit(map);
1127 err_range:
1128         regmap_range_exit(map);
1129         kfree(map->work_buf);
1130 err_hwlock:
1131         if (map->hwlock)
1132                 hwspin_lock_free(map->hwlock);
1133 err_name:
1134         kfree_const(map->name);
1135 err_map:
1136         kfree(map);
1137 err:
1138         return ERR_PTR(ret);
1139 }
1140 EXPORT_SYMBOL_GPL(__regmap_init);
1141
1142 static void devm_regmap_release(struct device *dev, void *res)
1143 {
1144         regmap_exit(*(struct regmap **)res);
1145 }
1146
1147 struct regmap *__devm_regmap_init(struct device *dev,
1148                                   const struct regmap_bus *bus,
1149                                   void *bus_context,
1150                                   const struct regmap_config *config,
1151                                   struct lock_class_key *lock_key,
1152                                   const char *lock_name)
1153 {
1154         struct regmap **ptr, *regmap;
1155
1156         ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
1157         if (!ptr)
1158                 return ERR_PTR(-ENOMEM);
1159
1160         regmap = __regmap_init(dev, bus, bus_context, config,
1161                                lock_key, lock_name);
1162         if (!IS_ERR(regmap)) {
1163                 *ptr = regmap;
1164                 devres_add(dev, ptr);
1165         } else {
1166                 devres_free(ptr);
1167         }
1168
1169         return regmap;
1170 }
1171 EXPORT_SYMBOL_GPL(__devm_regmap_init);
1172
1173 static void regmap_field_init(struct regmap_field *rm_field,
1174         struct regmap *regmap, struct reg_field reg_field)
1175 {
1176         rm_field->regmap = regmap;
1177         rm_field->reg = reg_field.reg;
1178         rm_field->shift = reg_field.lsb;
1179         rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
1180         rm_field->id_size = reg_field.id_size;
1181         rm_field->id_offset = reg_field.id_offset;
1182 }
1183
1184 /**
1185  * devm_regmap_field_alloc() - Allocate and initialise a register field.
1186  *
1187  * @dev: Device that will be interacted with
1188  * @regmap: regmap bank in which this register field is located.
1189  * @reg_field: Register field with in the bank.
1190  *
1191  * The return value will be an ERR_PTR() on error or a valid pointer
1192  * to a struct regmap_field. The regmap_field will be automatically freed
1193  * by the device management code.
1194  */
1195 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
1196                 struct regmap *regmap, struct reg_field reg_field)
1197 {
1198         struct regmap_field *rm_field = devm_kzalloc(dev,
1199                                         sizeof(*rm_field), GFP_KERNEL);
1200         if (!rm_field)
1201                 return ERR_PTR(-ENOMEM);
1202
1203         regmap_field_init(rm_field, regmap, reg_field);
1204
1205         return rm_field;
1206
1207 }
1208 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
1209
1210 /**
1211  * devm_regmap_field_free() - Free a register field allocated using
1212  *                            devm_regmap_field_alloc.
1213  *
1214  * @dev: Device that will be interacted with
1215  * @field: regmap field which should be freed.
1216  *
1217  * Free register field allocated using devm_regmap_field_alloc(). Usually
1218  * drivers need not call this function, as the memory allocated via devm
1219  * will be freed as per device-driver life-cyle.
1220  */
1221 void devm_regmap_field_free(struct device *dev,
1222         struct regmap_field *field)
1223 {
1224         devm_kfree(dev, field);
1225 }
1226 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
1227
1228 /**
1229  * regmap_field_alloc() - Allocate and initialise a register field.
1230  *
1231  * @regmap: regmap bank in which this register field is located.
1232  * @reg_field: Register field with in the bank.
1233  *
1234  * The return value will be an ERR_PTR() on error or a valid pointer
1235  * to a struct regmap_field. The regmap_field should be freed by the
1236  * user once its finished working with it using regmap_field_free().
1237  */
1238 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1239                 struct reg_field reg_field)
1240 {
1241         struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1242
1243         if (!rm_field)
1244                 return ERR_PTR(-ENOMEM);
1245
1246         regmap_field_init(rm_field, regmap, reg_field);
1247
1248         return rm_field;
1249 }
1250 EXPORT_SYMBOL_GPL(regmap_field_alloc);
1251
1252 /**
1253  * regmap_field_free() - Free register field allocated using
1254  *                       regmap_field_alloc.
1255  *
1256  * @field: regmap field which should be freed.
1257  */
1258 void regmap_field_free(struct regmap_field *field)
1259 {
1260         kfree(field);
1261 }
1262 EXPORT_SYMBOL_GPL(regmap_field_free);
1263
1264 /**
1265  * regmap_reinit_cache() - Reinitialise the current register cache
1266  *
1267  * @map: Register map to operate on.
1268  * @config: New configuration.  Only the cache data will be used.
1269  *
1270  * Discard any existing register cache for the map and initialize a
1271  * new cache.  This can be used to restore the cache to defaults or to
1272  * update the cache configuration to reflect runtime discovery of the
1273  * hardware.
1274  *
1275  * No explicit locking is done here, the user needs to ensure that
1276  * this function will not race with other calls to regmap.
1277  */
1278 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1279 {
1280         regcache_exit(map);
1281         regmap_debugfs_exit(map);
1282
1283         map->max_register = config->max_register;
1284         map->writeable_reg = config->writeable_reg;
1285         map->readable_reg = config->readable_reg;
1286         map->volatile_reg = config->volatile_reg;
1287         map->precious_reg = config->precious_reg;
1288         map->cache_type = config->cache_type;
1289
1290         regmap_debugfs_init(map, config->name);
1291
1292         map->cache_bypass = false;
1293         map->cache_only = false;
1294
1295         return regcache_init(map, config);
1296 }
1297 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1298
1299 /**
1300  * regmap_exit() - Free a previously allocated register map
1301  *
1302  * @map: Register map to operate on.
1303  */
1304 void regmap_exit(struct regmap *map)
1305 {
1306         struct regmap_async *async;
1307
1308         regcache_exit(map);
1309         regmap_debugfs_exit(map);
1310         regmap_range_exit(map);
1311         if (map->bus && map->bus->free_context)
1312                 map->bus->free_context(map->bus_context);
1313         kfree(map->work_buf);
1314         while (!list_empty(&map->async_free)) {
1315                 async = list_first_entry_or_null(&map->async_free,
1316                                                  struct regmap_async,
1317                                                  list);
1318                 list_del(&async->list);
1319                 kfree(async->work_buf);
1320                 kfree(async);
1321         }
1322         if (map->hwlock)
1323                 hwspin_lock_free(map->hwlock);
1324         kfree_const(map->name);
1325         kfree(map);
1326 }
1327 EXPORT_SYMBOL_GPL(regmap_exit);
1328
1329 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1330 {
1331         struct regmap **r = res;
1332         if (!r || !*r) {
1333                 WARN_ON(!r || !*r);
1334                 return 0;
1335         }
1336
1337         /* If the user didn't specify a name match any */
1338         if (data)
1339                 return (*r)->name == data;
1340         else
1341                 return 1;
1342 }
1343
1344 /**
1345  * dev_get_regmap() - Obtain the regmap (if any) for a device
1346  *
1347  * @dev: Device to retrieve the map for
1348  * @name: Optional name for the register map, usually NULL.
1349  *
1350  * Returns the regmap for the device if one is present, or NULL.  If
1351  * name is specified then it must match the name specified when
1352  * registering the device, if it is NULL then the first regmap found
1353  * will be used.  Devices with multiple register maps are very rare,
1354  * generic code should normally not need to specify a name.
1355  */
1356 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1357 {
1358         struct regmap **r = devres_find(dev, dev_get_regmap_release,
1359                                         dev_get_regmap_match, (void *)name);
1360
1361         if (!r)
1362                 return NULL;
1363         return *r;
1364 }
1365 EXPORT_SYMBOL_GPL(dev_get_regmap);
1366
1367 /**
1368  * regmap_get_device() - Obtain the device from a regmap
1369  *
1370  * @map: Register map to operate on.
1371  *
1372  * Returns the underlying device that the regmap has been created for.
1373  */
1374 struct device *regmap_get_device(struct regmap *map)
1375 {
1376         return map->dev;
1377 }
1378 EXPORT_SYMBOL_GPL(regmap_get_device);
1379
1380 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1381                                struct regmap_range_node *range,
1382                                unsigned int val_num)
1383 {
1384         void *orig_work_buf;
1385         unsigned int win_offset;
1386         unsigned int win_page;
1387         bool page_chg;
1388         int ret;
1389
1390         win_offset = (*reg - range->range_min) % range->window_len;
1391         win_page = (*reg - range->range_min) / range->window_len;
1392
1393         if (val_num > 1) {
1394                 /* Bulk write shouldn't cross range boundary */
1395                 if (*reg + val_num - 1 > range->range_max)
1396                         return -EINVAL;
1397
1398                 /* ... or single page boundary */
1399                 if (val_num > range->window_len - win_offset)
1400                         return -EINVAL;
1401         }
1402
1403         /* It is possible to have selector register inside data window.
1404            In that case, selector register is located on every page and
1405            it needs no page switching, when accessed alone. */
1406         if (val_num > 1 ||
1407             range->window_start + win_offset != range->selector_reg) {
1408                 /* Use separate work_buf during page switching */
1409                 orig_work_buf = map->work_buf;
1410                 map->work_buf = map->selector_work_buf;
1411
1412                 ret = _regmap_update_bits(map, range->selector_reg,
1413                                           range->selector_mask,
1414                                           win_page << range->selector_shift,
1415                                           &page_chg, false);
1416
1417                 map->work_buf = orig_work_buf;
1418
1419                 if (ret != 0)
1420                         return ret;
1421         }
1422
1423         *reg = range->window_start + win_offset;
1424
1425         return 0;
1426 }
1427
1428 static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes,
1429                                           unsigned long mask)
1430 {
1431         u8 *buf;
1432         int i;
1433
1434         if (!mask || !map->work_buf)
1435                 return;
1436
1437         buf = map->work_buf;
1438
1439         for (i = 0; i < max_bytes; i++)
1440                 buf[i] |= (mask >> (8 * i)) & 0xff;
1441 }
1442
1443 static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
1444                                   const void *val, size_t val_len)
1445 {
1446         struct regmap_range_node *range;
1447         unsigned long flags;
1448         void *work_val = map->work_buf + map->format.reg_bytes +
1449                 map->format.pad_bytes;
1450         void *buf;
1451         int ret = -ENOTSUPP;
1452         size_t len;
1453         int i;
1454
1455         WARN_ON(!map->bus);
1456
1457         /* Check for unwritable registers before we start */
1458         if (map->writeable_reg)
1459                 for (i = 0; i < val_len / map->format.val_bytes; i++)
1460                         if (!map->writeable_reg(map->dev,
1461                                                reg + regmap_get_offset(map, i)))
1462                                 return -EINVAL;
1463
1464         if (!map->cache_bypass && map->format.parse_val) {
1465                 unsigned int ival;
1466                 int val_bytes = map->format.val_bytes;
1467                 for (i = 0; i < val_len / val_bytes; i++) {
1468                         ival = map->format.parse_val(val + (i * val_bytes));
1469                         ret = regcache_write(map,
1470                                              reg + regmap_get_offset(map, i),
1471                                              ival);
1472                         if (ret) {
1473                                 dev_err(map->dev,
1474                                         "Error in caching of register: %x ret: %d\n",
1475                                         reg + i, ret);
1476                                 return ret;
1477                         }
1478                 }
1479                 if (map->cache_only) {
1480                         map->cache_dirty = true;
1481                         return 0;
1482                 }
1483         }
1484
1485         range = _regmap_range_lookup(map, reg);
1486         if (range) {
1487                 int val_num = val_len / map->format.val_bytes;
1488                 int win_offset = (reg - range->range_min) % range->window_len;
1489                 int win_residue = range->window_len - win_offset;
1490
1491                 /* If the write goes beyond the end of the window split it */
1492                 while (val_num > win_residue) {
1493                         dev_dbg(map->dev, "Writing window %d/%zu\n",
1494                                 win_residue, val_len / map->format.val_bytes);
1495                         ret = _regmap_raw_write_impl(map, reg, val,
1496                                                      win_residue *
1497                                                      map->format.val_bytes);
1498                         if (ret != 0)
1499                                 return ret;
1500
1501                         reg += win_residue;
1502                         val_num -= win_residue;
1503                         val += win_residue * map->format.val_bytes;
1504                         val_len -= win_residue * map->format.val_bytes;
1505
1506                         win_offset = (reg - range->range_min) %
1507                                 range->window_len;
1508                         win_residue = range->window_len - win_offset;
1509                 }
1510
1511                 ret = _regmap_select_page(map, &reg, range, val_num);
1512                 if (ret != 0)
1513                         return ret;
1514         }
1515
1516         map->format.format_reg(map->work_buf, reg, map->reg_shift);
1517         regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
1518                                       map->write_flag_mask);
1519
1520         /*
1521          * Essentially all I/O mechanisms will be faster with a single
1522          * buffer to write.  Since register syncs often generate raw
1523          * writes of single registers optimise that case.
1524          */
1525         if (val != work_val && val_len == map->format.val_bytes) {
1526                 memcpy(work_val, val, map->format.val_bytes);
1527                 val = work_val;
1528         }
1529
1530         if (map->async && map->bus->async_write) {
1531                 struct regmap_async *async;
1532
1533                 trace_regmap_async_write_start(map, reg, val_len);
1534
1535                 spin_lock_irqsave(&map->async_lock, flags);
1536                 async = list_first_entry_or_null(&map->async_free,
1537                                                  struct regmap_async,
1538                                                  list);
1539                 if (async)
1540                         list_del(&async->list);
1541                 spin_unlock_irqrestore(&map->async_lock, flags);
1542
1543                 if (!async) {
1544                         async = map->bus->async_alloc();
1545                         if (!async)
1546                                 return -ENOMEM;
1547
1548                         async->work_buf = kzalloc(map->format.buf_size,
1549                                                   GFP_KERNEL | GFP_DMA);
1550                         if (!async->work_buf) {
1551                                 kfree(async);
1552                                 return -ENOMEM;
1553                         }
1554                 }
1555
1556                 async->map = map;
1557
1558                 /* If the caller supplied the value we can use it safely. */
1559                 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1560                        map->format.reg_bytes + map->format.val_bytes);
1561
1562                 spin_lock_irqsave(&map->async_lock, flags);
1563                 list_add_tail(&async->list, &map->async_list);
1564                 spin_unlock_irqrestore(&map->async_lock, flags);
1565
1566                 if (val != work_val)
1567                         ret = map->bus->async_write(map->bus_context,
1568                                                     async->work_buf,
1569                                                     map->format.reg_bytes +
1570                                                     map->format.pad_bytes,
1571                                                     val, val_len, async);
1572                 else
1573                         ret = map->bus->async_write(map->bus_context,
1574                                                     async->work_buf,
1575                                                     map->format.reg_bytes +
1576                                                     map->format.pad_bytes +
1577                                                     val_len, NULL, 0, async);
1578
1579                 if (ret != 0) {
1580                         dev_err(map->dev, "Failed to schedule write: %d\n",
1581                                 ret);
1582
1583                         spin_lock_irqsave(&map->async_lock, flags);
1584                         list_move(&async->list, &map->async_free);
1585                         spin_unlock_irqrestore(&map->async_lock, flags);
1586                 }
1587
1588                 return ret;
1589         }
1590
1591         trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1592
1593         /* If we're doing a single register write we can probably just
1594          * send the work_buf directly, otherwise try to do a gather
1595          * write.
1596          */
1597         if (val == work_val)
1598                 ret = map->bus->write(map->bus_context, map->work_buf,
1599                                       map->format.reg_bytes +
1600                                       map->format.pad_bytes +
1601                                       val_len);
1602         else if (map->bus->gather_write)
1603                 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1604                                              map->format.reg_bytes +
1605                                              map->format.pad_bytes,
1606                                              val, val_len);
1607
1608         /* If that didn't work fall back on linearising by hand. */
1609         if (ret == -ENOTSUPP) {
1610                 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1611                 buf = kzalloc(len, GFP_KERNEL);
1612                 if (!buf)
1613                         return -ENOMEM;
1614
1615                 memcpy(buf, map->work_buf, map->format.reg_bytes);
1616                 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1617                        val, val_len);
1618                 ret = map->bus->write(map->bus_context, buf, len);
1619
1620                 kfree(buf);
1621         } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
1622                 /* regcache_drop_region() takes lock that we already have,
1623                  * thus call map->cache_ops->drop() directly
1624                  */
1625                 if (map->cache_ops && map->cache_ops->drop)
1626                         map->cache_ops->drop(map, reg, reg + 1);
1627         }
1628
1629         trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1630
1631         return ret;
1632 }
1633
1634 /**
1635  * regmap_can_raw_write - Test if regmap_raw_write() is supported
1636  *
1637  * @map: Map to check.
1638  */
1639 bool regmap_can_raw_write(struct regmap *map)
1640 {
1641         return map->bus && map->bus->write && map->format.format_val &&
1642                 map->format.format_reg;
1643 }
1644 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1645
1646 /**
1647  * regmap_get_raw_read_max - Get the maximum size we can read
1648  *
1649  * @map: Map to check.
1650  */
1651 size_t regmap_get_raw_read_max(struct regmap *map)
1652 {
1653         return map->max_raw_read;
1654 }
1655 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
1656
1657 /**
1658  * regmap_get_raw_write_max - Get the maximum size we can read
1659  *
1660  * @map: Map to check.
1661  */
1662 size_t regmap_get_raw_write_max(struct regmap *map)
1663 {
1664         return map->max_raw_write;
1665 }
1666 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
1667
1668 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1669                                        unsigned int val)
1670 {
1671         int ret;
1672         struct regmap_range_node *range;
1673         struct regmap *map = context;
1674
1675         WARN_ON(!map->bus || !map->format.format_write);
1676
1677         range = _regmap_range_lookup(map, reg);
1678         if (range) {
1679                 ret = _regmap_select_page(map, &reg, range, 1);
1680                 if (ret != 0)
1681                         return ret;
1682         }
1683
1684         map->format.format_write(map, reg, val);
1685
1686         trace_regmap_hw_write_start(map, reg, 1);
1687
1688         ret = map->bus->write(map->bus_context, map->work_buf,
1689                               map->format.buf_size);
1690
1691         trace_regmap_hw_write_done(map, reg, 1);
1692
1693         return ret;
1694 }
1695
1696 static int _regmap_bus_reg_write(void *context, unsigned int reg,
1697                                  unsigned int val)
1698 {
1699         struct regmap *map = context;
1700
1701         return map->bus->reg_write(map->bus_context, reg, val);
1702 }
1703
1704 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1705                                  unsigned int val)
1706 {
1707         struct regmap *map = context;
1708
1709         WARN_ON(!map->bus || !map->format.format_val);
1710
1711         map->format.format_val(map->work_buf + map->format.reg_bytes
1712                                + map->format.pad_bytes, val, 0);
1713         return _regmap_raw_write_impl(map, reg,
1714                                       map->work_buf +
1715                                       map->format.reg_bytes +
1716                                       map->format.pad_bytes,
1717                                       map->format.val_bytes);
1718 }
1719
1720 static inline void *_regmap_map_get_context(struct regmap *map)
1721 {
1722         return (map->bus) ? map : map->bus_context;
1723 }
1724
1725 int _regmap_write(struct regmap *map, unsigned int reg,
1726                   unsigned int val)
1727 {
1728         int ret;
1729         void *context = _regmap_map_get_context(map);
1730
1731         if (!regmap_writeable(map, reg))
1732                 return -EIO;
1733
1734         if (!map->cache_bypass && !map->defer_caching) {
1735                 ret = regcache_write(map, reg, val);
1736                 if (ret != 0)
1737                         return ret;
1738                 if (map->cache_only) {
1739                         map->cache_dirty = true;
1740                         return 0;
1741                 }
1742         }
1743
1744 #ifdef LOG_DEVICE
1745         if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1746                 dev_info(map->dev, "%x <= %x\n", reg, val);
1747 #endif
1748
1749         trace_regmap_reg_write(map, reg, val);
1750
1751         return map->reg_write(context, reg, val);
1752 }
1753
1754 /**
1755  * regmap_write() - Write a value to a single register
1756  *
1757  * @map: Register map to write to
1758  * @reg: Register to write to
1759  * @val: Value to be written
1760  *
1761  * A value of zero will be returned on success, a negative errno will
1762  * be returned in error cases.
1763  */
1764 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1765 {
1766         int ret;
1767
1768         if (!IS_ALIGNED(reg, map->reg_stride))
1769                 return -EINVAL;
1770
1771         map->lock(map->lock_arg);
1772
1773         ret = _regmap_write(map, reg, val);
1774
1775         map->unlock(map->lock_arg);
1776
1777         return ret;
1778 }
1779 EXPORT_SYMBOL_GPL(regmap_write);
1780
1781 /**
1782  * regmap_write_async() - Write a value to a single register asynchronously
1783  *
1784  * @map: Register map to write to
1785  * @reg: Register to write to
1786  * @val: Value to be written
1787  *
1788  * A value of zero will be returned on success, a negative errno will
1789  * be returned in error cases.
1790  */
1791 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1792 {
1793         int ret;
1794
1795         if (!IS_ALIGNED(reg, map->reg_stride))
1796                 return -EINVAL;
1797
1798         map->lock(map->lock_arg);
1799
1800         map->async = true;
1801
1802         ret = _regmap_write(map, reg, val);
1803
1804         map->async = false;
1805
1806         map->unlock(map->lock_arg);
1807
1808         return ret;
1809 }
1810 EXPORT_SYMBOL_GPL(regmap_write_async);
1811
1812 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1813                       const void *val, size_t val_len)
1814 {
1815         size_t val_bytes = map->format.val_bytes;
1816         size_t val_count = val_len / val_bytes;
1817         size_t chunk_count, chunk_bytes;
1818         size_t chunk_regs = val_count;
1819         int ret, i;
1820
1821         if (!val_count)
1822                 return -EINVAL;
1823
1824         if (map->use_single_write)
1825                 chunk_regs = 1;
1826         else if (map->max_raw_write && val_len > map->max_raw_write)
1827                 chunk_regs = map->max_raw_write / val_bytes;
1828
1829         chunk_count = val_count / chunk_regs;
1830         chunk_bytes = chunk_regs * val_bytes;
1831
1832         /* Write as many bytes as possible with chunk_size */
1833         for (i = 0; i < chunk_count; i++) {
1834                 ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes);
1835                 if (ret)
1836                         return ret;
1837
1838                 reg += regmap_get_offset(map, chunk_regs);
1839                 val += chunk_bytes;
1840                 val_len -= chunk_bytes;
1841         }
1842
1843         /* Write remaining bytes */
1844         if (val_len)
1845                 ret = _regmap_raw_write_impl(map, reg, val, val_len);
1846
1847         return ret;
1848 }
1849
1850 /**
1851  * regmap_raw_write() - Write raw values to one or more registers
1852  *
1853  * @map: Register map to write to
1854  * @reg: Initial register to write to
1855  * @val: Block of data to be written, laid out for direct transmission to the
1856  *       device
1857  * @val_len: Length of data pointed to by val.
1858  *
1859  * This function is intended to be used for things like firmware
1860  * download where a large block of data needs to be transferred to the
1861  * device.  No formatting will be done on the data provided.
1862  *
1863  * A value of zero will be returned on success, a negative errno will
1864  * be returned in error cases.
1865  */
1866 int regmap_raw_write(struct regmap *map, unsigned int reg,
1867                      const void *val, size_t val_len)
1868 {
1869         int ret;
1870
1871         if (!regmap_can_raw_write(map))
1872                 return -EINVAL;
1873         if (val_len % map->format.val_bytes)
1874                 return -EINVAL;
1875
1876         map->lock(map->lock_arg);
1877
1878         ret = _regmap_raw_write(map, reg, val, val_len);
1879
1880         map->unlock(map->lock_arg);
1881
1882         return ret;
1883 }
1884 EXPORT_SYMBOL_GPL(regmap_raw_write);
1885
1886 /**
1887  * regmap_field_update_bits_base() - Perform a read/modify/write cycle a
1888  *                                   register field.
1889  *
1890  * @field: Register field to write to
1891  * @mask: Bitmask to change
1892  * @val: Value to be written
1893  * @change: Boolean indicating if a write was done
1894  * @async: Boolean indicating asynchronously
1895  * @force: Boolean indicating use force update
1896  *
1897  * Perform a read/modify/write cycle on the register field with change,
1898  * async, force option.
1899  *
1900  * A value of zero will be returned on success, a negative errno will
1901  * be returned in error cases.
1902  */
1903 int regmap_field_update_bits_base(struct regmap_field *field,
1904                                   unsigned int mask, unsigned int val,
1905                                   bool *change, bool async, bool force)
1906 {
1907         mask = (mask << field->shift) & field->mask;
1908
1909         return regmap_update_bits_base(field->regmap, field->reg,
1910                                        mask, val << field->shift,
1911                                        change, async, force);
1912 }
1913 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
1914
1915 /**
1916  * regmap_fields_update_bits_base() - Perform a read/modify/write cycle a
1917  *                                    register field with port ID
1918  *
1919  * @field: Register field to write to
1920  * @id: port ID
1921  * @mask: Bitmask to change
1922  * @val: Value to be written
1923  * @change: Boolean indicating if a write was done
1924  * @async: Boolean indicating asynchronously
1925  * @force: Boolean indicating use force update
1926  *
1927  * A value of zero will be returned on success, a negative errno will
1928  * be returned in error cases.
1929  */
1930 int regmap_fields_update_bits_base(struct regmap_field *field,  unsigned int id,
1931                                    unsigned int mask, unsigned int val,
1932                                    bool *change, bool async, bool force)
1933 {
1934         if (id >= field->id_size)
1935                 return -EINVAL;
1936
1937         mask = (mask << field->shift) & field->mask;
1938
1939         return regmap_update_bits_base(field->regmap,
1940                                        field->reg + (field->id_offset * id),
1941                                        mask, val << field->shift,
1942                                        change, async, force);
1943 }
1944 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
1945
1946 /**
1947  * regmap_bulk_write() - Write multiple registers to the device
1948  *
1949  * @map: Register map to write to
1950  * @reg: First register to be write from
1951  * @val: Block of data to be written, in native register size for device
1952  * @val_count: Number of registers to write
1953  *
1954  * This function is intended to be used for writing a large block of
1955  * data to the device either in single transfer or multiple transfer.
1956  *
1957  * A value of zero will be returned on success, a negative errno will
1958  * be returned in error cases.
1959  */
1960 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1961                      size_t val_count)
1962 {
1963         int ret = 0, i;
1964         size_t val_bytes = map->format.val_bytes;
1965
1966         if (!IS_ALIGNED(reg, map->reg_stride))
1967                 return -EINVAL;
1968
1969         /*
1970          * Some devices don't support bulk write, for them we have a series of
1971          * single write operations.
1972          */
1973         if (!map->bus || !map->format.parse_inplace) {
1974                 map->lock(map->lock_arg);
1975                 for (i = 0; i < val_count; i++) {
1976                         unsigned int ival;
1977
1978                         switch (val_bytes) {
1979                         case 1:
1980                                 ival = *(u8 *)(val + (i * val_bytes));
1981                                 break;
1982                         case 2:
1983                                 ival = *(u16 *)(val + (i * val_bytes));
1984                                 break;
1985                         case 4:
1986                                 ival = *(u32 *)(val + (i * val_bytes));
1987                                 break;
1988 #ifdef CONFIG_64BIT
1989                         case 8:
1990                                 ival = *(u64 *)(val + (i * val_bytes));
1991                                 break;
1992 #endif
1993                         default:
1994                                 ret = -EINVAL;
1995                                 goto out;
1996                         }
1997
1998                         ret = _regmap_write(map,
1999                                             reg + regmap_get_offset(map, i),
2000                                             ival);
2001                         if (ret != 0)
2002                                 goto out;
2003                 }
2004 out:
2005                 map->unlock(map->lock_arg);
2006         } else {
2007                 void *wval;
2008
2009                 wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
2010                 if (!wval)
2011                         return -ENOMEM;
2012
2013                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2014                         map->format.parse_inplace(wval + i);
2015
2016                 ret = regmap_raw_write(map, reg, wval, val_bytes * val_count);
2017
2018                 kfree(wval);
2019         }
2020         return ret;
2021 }
2022 EXPORT_SYMBOL_GPL(regmap_bulk_write);
2023
2024 /*
2025  * _regmap_raw_multi_reg_write()
2026  *
2027  * the (register,newvalue) pairs in regs have not been formatted, but
2028  * they are all in the same page and have been changed to being page
2029  * relative. The page register has been written if that was necessary.
2030  */
2031 static int _regmap_raw_multi_reg_write(struct regmap *map,
2032                                        const struct reg_sequence *regs,
2033                                        size_t num_regs)
2034 {
2035         int ret;
2036         void *buf;
2037         int i;
2038         u8 *u8;
2039         size_t val_bytes = map->format.val_bytes;
2040         size_t reg_bytes = map->format.reg_bytes;
2041         size_t pad_bytes = map->format.pad_bytes;
2042         size_t pair_size = reg_bytes + pad_bytes + val_bytes;
2043         size_t len = pair_size * num_regs;
2044
2045         if (!len)
2046                 return -EINVAL;
2047
2048         buf = kzalloc(len, GFP_KERNEL);
2049         if (!buf)
2050                 return -ENOMEM;
2051
2052         /* We have to linearise by hand. */
2053
2054         u8 = buf;
2055
2056         for (i = 0; i < num_regs; i++) {
2057                 unsigned int reg = regs[i].reg;
2058                 unsigned int val = regs[i].def;
2059                 trace_regmap_hw_write_start(map, reg, 1);
2060                 map->format.format_reg(u8, reg, map->reg_shift);
2061                 u8 += reg_bytes + pad_bytes;
2062                 map->format.format_val(u8, val, 0);
2063                 u8 += val_bytes;
2064         }
2065         u8 = buf;
2066         *u8 |= map->write_flag_mask;
2067
2068         ret = map->bus->write(map->bus_context, buf, len);
2069
2070         kfree(buf);
2071
2072         for (i = 0; i < num_regs; i++) {
2073                 int reg = regs[i].reg;
2074                 trace_regmap_hw_write_done(map, reg, 1);
2075         }
2076         return ret;
2077 }
2078
2079 static unsigned int _regmap_register_page(struct regmap *map,
2080                                           unsigned int reg,
2081                                           struct regmap_range_node *range)
2082 {
2083         unsigned int win_page = (reg - range->range_min) / range->window_len;
2084
2085         return win_page;
2086 }
2087
2088 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
2089                                                struct reg_sequence *regs,
2090                                                size_t num_regs)
2091 {
2092         int ret;
2093         int i, n;
2094         struct reg_sequence *base;
2095         unsigned int this_page = 0;
2096         unsigned int page_change = 0;
2097         /*
2098          * the set of registers are not neccessarily in order, but
2099          * since the order of write must be preserved this algorithm
2100          * chops the set each time the page changes. This also applies
2101          * if there is a delay required at any point in the sequence.
2102          */
2103         base = regs;
2104         for (i = 0, n = 0; i < num_regs; i++, n++) {
2105                 unsigned int reg = regs[i].reg;
2106                 struct regmap_range_node *range;
2107
2108                 range = _regmap_range_lookup(map, reg);
2109                 if (range) {
2110                         unsigned int win_page = _regmap_register_page(map, reg,
2111                                                                       range);
2112
2113                         if (i == 0)
2114                                 this_page = win_page;
2115                         if (win_page != this_page) {
2116                                 this_page = win_page;
2117                                 page_change = 1;
2118                         }
2119                 }
2120
2121                 /* If we have both a page change and a delay make sure to
2122                  * write the regs and apply the delay before we change the
2123                  * page.
2124                  */
2125
2126                 if (page_change || regs[i].delay_us) {
2127
2128                                 /* For situations where the first write requires
2129                                  * a delay we need to make sure we don't call
2130                                  * raw_multi_reg_write with n=0
2131                                  * This can't occur with page breaks as we
2132                                  * never write on the first iteration
2133                                  */
2134                                 if (regs[i].delay_us && i == 0)
2135                                         n = 1;
2136
2137                                 ret = _regmap_raw_multi_reg_write(map, base, n);
2138                                 if (ret != 0)
2139                                         return ret;
2140
2141                                 if (regs[i].delay_us)
2142                                         udelay(regs[i].delay_us);
2143
2144                                 base += n;
2145                                 n = 0;
2146
2147                                 if (page_change) {
2148                                         ret = _regmap_select_page(map,
2149                                                                   &base[n].reg,
2150                                                                   range, 1);
2151                                         if (ret != 0)
2152                                                 return ret;
2153
2154                                         page_change = 0;
2155                                 }
2156
2157                 }
2158
2159         }
2160         if (n > 0)
2161                 return _regmap_raw_multi_reg_write(map, base, n);
2162         return 0;
2163 }
2164
2165 static int _regmap_multi_reg_write(struct regmap *map,
2166                                    const struct reg_sequence *regs,
2167                                    size_t num_regs)
2168 {
2169         int i;
2170         int ret;
2171
2172         if (!map->can_multi_write) {
2173                 for (i = 0; i < num_regs; i++) {
2174                         ret = _regmap_write(map, regs[i].reg, regs[i].def);
2175                         if (ret != 0)
2176                                 return ret;
2177
2178                         if (regs[i].delay_us)
2179                                 udelay(regs[i].delay_us);
2180                 }
2181                 return 0;
2182         }
2183
2184         if (!map->format.parse_inplace)
2185                 return -EINVAL;
2186
2187         if (map->writeable_reg)
2188                 for (i = 0; i < num_regs; i++) {
2189                         int reg = regs[i].reg;
2190                         if (!map->writeable_reg(map->dev, reg))
2191                                 return -EINVAL;
2192                         if (!IS_ALIGNED(reg, map->reg_stride))
2193                                 return -EINVAL;
2194                 }
2195
2196         if (!map->cache_bypass) {
2197                 for (i = 0; i < num_regs; i++) {
2198                         unsigned int val = regs[i].def;
2199                         unsigned int reg = regs[i].reg;
2200                         ret = regcache_write(map, reg, val);
2201                         if (ret) {
2202                                 dev_err(map->dev,
2203                                 "Error in caching of register: %x ret: %d\n",
2204                                                                 reg, ret);
2205                                 return ret;
2206                         }
2207                 }
2208                 if (map->cache_only) {
2209                         map->cache_dirty = true;
2210                         return 0;
2211                 }
2212         }
2213
2214         WARN_ON(!map->bus);
2215
2216         for (i = 0; i < num_regs; i++) {
2217                 unsigned int reg = regs[i].reg;
2218                 struct regmap_range_node *range;
2219
2220                 /* Coalesce all the writes between a page break or a delay
2221                  * in a sequence
2222                  */
2223                 range = _regmap_range_lookup(map, reg);
2224                 if (range || regs[i].delay_us) {
2225                         size_t len = sizeof(struct reg_sequence)*num_regs;
2226                         struct reg_sequence *base = kmemdup(regs, len,
2227                                                            GFP_KERNEL);
2228                         if (!base)
2229                                 return -ENOMEM;
2230                         ret = _regmap_range_multi_paged_reg_write(map, base,
2231                                                                   num_regs);
2232                         kfree(base);
2233
2234                         return ret;
2235                 }
2236         }
2237         return _regmap_raw_multi_reg_write(map, regs, num_regs);
2238 }
2239
2240 /**
2241  * regmap_multi_reg_write() - Write multiple registers to the device
2242  *
2243  * @map: Register map to write to
2244  * @regs: Array of structures containing register,value to be written
2245  * @num_regs: Number of registers to write
2246  *
2247  * Write multiple registers to the device where the set of register, value
2248  * pairs are supplied in any order, possibly not all in a single range.
2249  *
2250  * The 'normal' block write mode will send ultimately send data on the
2251  * target bus as R,V1,V2,V3,..,Vn where successively higher registers are
2252  * addressed. However, this alternative block multi write mode will send
2253  * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2254  * must of course support the mode.
2255  *
2256  * A value of zero will be returned on success, a negative errno will be
2257  * returned in error cases.
2258  */
2259 int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
2260                            int num_regs)
2261 {
2262         int ret;
2263
2264         map->lock(map->lock_arg);
2265
2266         ret = _regmap_multi_reg_write(map, regs, num_regs);
2267
2268         map->unlock(map->lock_arg);
2269
2270         return ret;
2271 }
2272 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
2273
2274 /**
2275  * regmap_multi_reg_write_bypassed() - Write multiple registers to the
2276  *                                     device but not the cache
2277  *
2278  * @map: Register map to write to
2279  * @regs: Array of structures containing register,value to be written
2280  * @num_regs: Number of registers to write
2281  *
2282  * Write multiple registers to the device but not the cache where the set
2283  * of register are supplied in any order.
2284  *
2285  * This function is intended to be used for writing a large block of data
2286  * atomically to the device in single transfer for those I2C client devices
2287  * that implement this alternative block write mode.
2288  *
2289  * A value of zero will be returned on success, a negative errno will
2290  * be returned in error cases.
2291  */
2292 int regmap_multi_reg_write_bypassed(struct regmap *map,
2293                                     const struct reg_sequence *regs,
2294                                     int num_regs)
2295 {
2296         int ret;
2297         bool bypass;
2298
2299         map->lock(map->lock_arg);
2300
2301         bypass = map->cache_bypass;
2302         map->cache_bypass = true;
2303
2304         ret = _regmap_multi_reg_write(map, regs, num_regs);
2305
2306         map->cache_bypass = bypass;
2307
2308         map->unlock(map->lock_arg);
2309
2310         return ret;
2311 }
2312 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
2313
2314 /**
2315  * regmap_raw_write_async() - Write raw values to one or more registers
2316  *                            asynchronously
2317  *
2318  * @map: Register map to write to
2319  * @reg: Initial register to write to
2320  * @val: Block of data to be written, laid out for direct transmission to the
2321  *       device.  Must be valid until regmap_async_complete() is called.
2322  * @val_len: Length of data pointed to by val.
2323  *
2324  * This function is intended to be used for things like firmware
2325  * download where a large block of data needs to be transferred to the
2326  * device.  No formatting will be done on the data provided.
2327  *
2328  * If supported by the underlying bus the write will be scheduled
2329  * asynchronously, helping maximise I/O speed on higher speed buses
2330  * like SPI.  regmap_async_complete() can be called to ensure that all
2331  * asynchrnous writes have been completed.
2332  *
2333  * A value of zero will be returned on success, a negative errno will
2334  * be returned in error cases.
2335  */
2336 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2337                            const void *val, size_t val_len)
2338 {
2339         int ret;
2340
2341         if (val_len % map->format.val_bytes)
2342                 return -EINVAL;
2343         if (!IS_ALIGNED(reg, map->reg_stride))
2344                 return -EINVAL;
2345
2346         map->lock(map->lock_arg);
2347
2348         map->async = true;
2349
2350         ret = _regmap_raw_write(map, reg, val, val_len);
2351
2352         map->async = false;
2353
2354         map->unlock(map->lock_arg);
2355
2356         return ret;
2357 }
2358 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2359
2360 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2361                             unsigned int val_len)
2362 {
2363         struct regmap_range_node *range;
2364         int ret;
2365
2366         WARN_ON(!map->bus);
2367
2368         if (!map->bus || !map->bus->read)
2369                 return -EINVAL;
2370
2371         range = _regmap_range_lookup(map, reg);
2372         if (range) {
2373                 ret = _regmap_select_page(map, &reg, range,
2374                                           val_len / map->format.val_bytes);
2375                 if (ret != 0)
2376                         return ret;
2377         }
2378
2379         map->format.format_reg(map->work_buf, reg, map->reg_shift);
2380         regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
2381                                       map->read_flag_mask);
2382         trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2383
2384         ret = map->bus->read(map->bus_context, map->work_buf,
2385                              map->format.reg_bytes + map->format.pad_bytes,
2386                              val, val_len);
2387
2388         trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2389
2390         return ret;
2391 }
2392
2393 static int _regmap_bus_reg_read(void *context, unsigned int reg,
2394                                 unsigned int *val)
2395 {
2396         struct regmap *map = context;
2397
2398         return map->bus->reg_read(map->bus_context, reg, val);
2399 }
2400
2401 static int _regmap_bus_read(void *context, unsigned int reg,
2402                             unsigned int *val)
2403 {
2404         int ret;
2405         struct regmap *map = context;
2406         void *work_val = map->work_buf + map->format.reg_bytes +
2407                 map->format.pad_bytes;
2408
2409         if (!map->format.parse_val)
2410                 return -EINVAL;
2411
2412         ret = _regmap_raw_read(map, reg, work_val, map->format.val_bytes);
2413         if (ret == 0)
2414                 *val = map->format.parse_val(work_val);
2415
2416         return ret;
2417 }
2418
2419 static int _regmap_read(struct regmap *map, unsigned int reg,
2420                         unsigned int *val)
2421 {
2422         int ret;
2423         void *context = _regmap_map_get_context(map);
2424
2425         if (!map->cache_bypass) {
2426                 ret = regcache_read(map, reg, val);
2427                 if (ret == 0)
2428                         return 0;
2429         }
2430
2431         if (map->cache_only)
2432                 return -EBUSY;
2433
2434         if (!regmap_readable(map, reg))
2435                 return -EIO;
2436
2437         ret = map->reg_read(context, reg, val);
2438         if (ret == 0) {
2439 #ifdef LOG_DEVICE
2440                 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2441                         dev_info(map->dev, "%x => %x\n", reg, *val);
2442 #endif
2443
2444                 trace_regmap_reg_read(map, reg, *val);
2445
2446                 if (!map->cache_bypass)
2447                         regcache_write(map, reg, *val);
2448         }
2449
2450         return ret;
2451 }
2452
2453 /**
2454  * regmap_read() - Read a value from a single register
2455  *
2456  * @map: Register map to read from
2457  * @reg: Register to be read from
2458  * @val: Pointer to store read value
2459  *
2460  * A value of zero will be returned on success, a negative errno will
2461  * be returned in error cases.
2462  */
2463 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2464 {
2465         int ret;
2466
2467         if (!IS_ALIGNED(reg, map->reg_stride))
2468                 return -EINVAL;
2469
2470         map->lock(map->lock_arg);
2471
2472         ret = _regmap_read(map, reg, val);
2473
2474         map->unlock(map->lock_arg);
2475
2476         return ret;
2477 }
2478 EXPORT_SYMBOL_GPL(regmap_read);
2479
2480 /**
2481  * regmap_raw_read() - Read raw data from the device
2482  *
2483  * @map: Register map to read from
2484  * @reg: First register to be read from
2485  * @val: Pointer to store read value
2486  * @val_len: Size of data to read
2487  *
2488  * A value of zero will be returned on success, a negative errno will
2489  * be returned in error cases.
2490  */
2491 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2492                     size_t val_len)
2493 {
2494         size_t val_bytes = map->format.val_bytes;
2495         size_t val_count = val_len / val_bytes;
2496         unsigned int v;
2497         int ret, i;
2498
2499         if (!map->bus)
2500                 return -EINVAL;
2501         if (val_len % map->format.val_bytes)
2502                 return -EINVAL;
2503         if (!IS_ALIGNED(reg, map->reg_stride))
2504                 return -EINVAL;
2505         if (val_count == 0)
2506                 return -EINVAL;
2507
2508         map->lock(map->lock_arg);
2509
2510         if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2511             map->cache_type == REGCACHE_NONE) {
2512                 size_t chunk_count, chunk_bytes;
2513                 size_t chunk_regs = val_count;
2514
2515                 if (!map->bus->read) {
2516                         ret = -ENOTSUPP;
2517                         goto out;
2518                 }
2519
2520                 if (map->use_single_read)
2521                         chunk_regs = 1;
2522                 else if (map->max_raw_read && val_len > map->max_raw_read)
2523                         chunk_regs = map->max_raw_read / val_bytes;
2524
2525                 chunk_count = val_count / chunk_regs;
2526                 chunk_bytes = chunk_regs * val_bytes;
2527
2528                 /* Read bytes that fit into whole chunks */
2529                 for (i = 0; i < chunk_count; i++) {
2530                         ret = _regmap_raw_read(map, reg, val, chunk_bytes);
2531                         if (ret != 0)
2532                                 goto out;
2533
2534                         reg += regmap_get_offset(map, chunk_regs);
2535                         val += chunk_bytes;
2536                         val_len -= chunk_bytes;
2537                 }
2538
2539                 /* Read remaining bytes */
2540                 if (val_len) {
2541                         ret = _regmap_raw_read(map, reg, val, val_len);
2542                         if (ret != 0)
2543                                 goto out;
2544                 }
2545         } else {
2546                 /* Otherwise go word by word for the cache; should be low
2547                  * cost as we expect to hit the cache.
2548                  */
2549                 for (i = 0; i < val_count; i++) {
2550                         ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2551                                            &v);
2552                         if (ret != 0)
2553                                 goto out;
2554
2555                         map->format.format_val(val + (i * val_bytes), v, 0);
2556                 }
2557         }
2558
2559  out:
2560         map->unlock(map->lock_arg);
2561
2562         return ret;
2563 }
2564 EXPORT_SYMBOL_GPL(regmap_raw_read);
2565
2566 /**
2567  * regmap_field_read() - Read a value to a single register field
2568  *
2569  * @field: Register field to read from
2570  * @val: Pointer to store read value
2571  *
2572  * A value of zero will be returned on success, a negative errno will
2573  * be returned in error cases.
2574  */
2575 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2576 {
2577         int ret;
2578         unsigned int reg_val;
2579         ret = regmap_read(field->regmap, field->reg, &reg_val);
2580         if (ret != 0)
2581                 return ret;
2582
2583         reg_val &= field->mask;
2584         reg_val >>= field->shift;
2585         *val = reg_val;
2586
2587         return ret;
2588 }
2589 EXPORT_SYMBOL_GPL(regmap_field_read);
2590
2591 /**
2592  * regmap_fields_read() - Read a value to a single register field with port ID
2593  *
2594  * @field: Register field to read from
2595  * @id: port ID
2596  * @val: Pointer to store read value
2597  *
2598  * A value of zero will be returned on success, a negative errno will
2599  * be returned in error cases.
2600  */
2601 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2602                        unsigned int *val)
2603 {
2604         int ret;
2605         unsigned int reg_val;
2606
2607         if (id >= field->id_size)
2608                 return -EINVAL;
2609
2610         ret = regmap_read(field->regmap,
2611                           field->reg + (field->id_offset * id),
2612                           &reg_val);
2613         if (ret != 0)
2614                 return ret;
2615
2616         reg_val &= field->mask;
2617         reg_val >>= field->shift;
2618         *val = reg_val;
2619
2620         return ret;
2621 }
2622 EXPORT_SYMBOL_GPL(regmap_fields_read);
2623
2624 /**
2625  * regmap_bulk_read() - Read multiple registers from the device
2626  *
2627  * @map: Register map to read from
2628  * @reg: First register to be read from
2629  * @val: Pointer to store read value, in native register size for device
2630  * @val_count: Number of registers to read
2631  *
2632  * A value of zero will be returned on success, a negative errno will
2633  * be returned in error cases.
2634  */
2635 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2636                      size_t val_count)
2637 {
2638         int ret, i;
2639         size_t val_bytes = map->format.val_bytes;
2640         bool vol = regmap_volatile_range(map, reg, val_count);
2641
2642         if (!IS_ALIGNED(reg, map->reg_stride))
2643                 return -EINVAL;
2644         if (val_count == 0)
2645                 return -EINVAL;
2646
2647         if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2648                 ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
2649                 if (ret != 0)
2650                         return ret;
2651
2652                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2653                         map->format.parse_inplace(val + i);
2654         } else {
2655 #ifdef CONFIG_64BIT
2656                 u64 *u64 = val;
2657 #endif
2658                 u32 *u32 = val;
2659                 u16 *u16 = val;
2660                 u8 *u8 = val;
2661
2662                 map->lock(map->lock_arg);
2663
2664                 for (i = 0; i < val_count; i++) {
2665                         unsigned int ival;
2666
2667                         ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2668                                            &ival);
2669                         if (ret != 0)
2670                                 goto out;
2671
2672                         switch (map->format.val_bytes) {
2673 #ifdef CONFIG_64BIT
2674                         case 8:
2675                                 u64[i] = ival;
2676                                 break;
2677 #endif
2678                         case 4:
2679                                 u32[i] = ival;
2680                                 break;
2681                         case 2:
2682                                 u16[i] = ival;
2683                                 break;
2684                         case 1:
2685                                 u8[i] = ival;
2686                                 break;
2687                         default:
2688                                 ret = -EINVAL;
2689                                 goto out;
2690                         }
2691                 }
2692
2693 out:
2694                 map->unlock(map->lock_arg);
2695         }
2696
2697         return ret;
2698 }
2699 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2700
2701 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2702                                unsigned int mask, unsigned int val,
2703                                bool *change, bool force_write)
2704 {
2705         int ret;
2706         unsigned int tmp, orig;
2707
2708         if (change)
2709                 *change = false;
2710
2711         if (regmap_volatile(map, reg) && map->reg_update_bits) {
2712                 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
2713                 if (ret == 0 && change)
2714                         *change = true;
2715         } else {
2716                 ret = _regmap_read(map, reg, &orig);
2717                 if (ret != 0)
2718                         return ret;
2719
2720                 tmp = orig & ~mask;
2721                 tmp |= val & mask;
2722
2723                 if (force_write || (tmp != orig)) {
2724                         ret = _regmap_write(map, reg, tmp);
2725                         if (ret == 0 && change)
2726                                 *change = true;
2727                 }
2728         }
2729
2730         return ret;
2731 }
2732
2733 /**
2734  * regmap_update_bits_base() - Perform a read/modify/write cycle on a register
2735  *
2736  * @map: Register map to update
2737  * @reg: Register to update
2738  * @mask: Bitmask to change
2739  * @val: New value for bitmask
2740  * @change: Boolean indicating if a write was done
2741  * @async: Boolean indicating asynchronously
2742  * @force: Boolean indicating use force update
2743  *
2744  * Perform a read/modify/write cycle on a register map with change, async, force
2745  * options.
2746  *
2747  * If async is true:
2748  *
2749  * With most buses the read must be done synchronously so this is most useful
2750  * for devices with a cache which do not need to interact with the hardware to
2751  * determine the current register value.
2752  *
2753  * Returns zero for success, a negative number on error.
2754  */
2755 int regmap_update_bits_base(struct regmap *map, unsigned int reg,
2756                             unsigned int mask, unsigned int val,
2757                             bool *change, bool async, bool force)
2758 {
2759         int ret;
2760
2761         map->lock(map->lock_arg);
2762
2763         map->async = async;
2764
2765         ret = _regmap_update_bits(map, reg, mask, val, change, force);
2766
2767         map->async = false;
2768
2769         map->unlock(map->lock_arg);
2770
2771         return ret;
2772 }
2773 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
2774
2775 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2776 {
2777         struct regmap *map = async->map;
2778         bool wake;
2779
2780         trace_regmap_async_io_complete(map);
2781
2782         spin_lock(&map->async_lock);
2783         list_move(&async->list, &map->async_free);
2784         wake = list_empty(&map->async_list);
2785
2786         if (ret != 0)
2787                 map->async_ret = ret;
2788
2789         spin_unlock(&map->async_lock);
2790
2791         if (wake)
2792                 wake_up(&map->async_waitq);
2793 }
2794 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2795
2796 static int regmap_async_is_done(struct regmap *map)
2797 {
2798         unsigned long flags;
2799         int ret;
2800
2801         spin_lock_irqsave(&map->async_lock, flags);
2802         ret = list_empty(&map->async_list);
2803         spin_unlock_irqrestore(&map->async_lock, flags);
2804
2805         return ret;
2806 }
2807
2808 /**
2809  * regmap_async_complete - Ensure all asynchronous I/O has completed.
2810  *
2811  * @map: Map to operate on.
2812  *
2813  * Blocks until any pending asynchronous I/O has completed.  Returns
2814  * an error code for any failed I/O operations.
2815  */
2816 int regmap_async_complete(struct regmap *map)
2817 {
2818         unsigned long flags;
2819         int ret;
2820
2821         /* Nothing to do with no async support */
2822         if (!map->bus || !map->bus->async_write)
2823                 return 0;
2824
2825         trace_regmap_async_complete_start(map);
2826
2827         wait_event(map->async_waitq, regmap_async_is_done(map));
2828
2829         spin_lock_irqsave(&map->async_lock, flags);
2830         ret = map->async_ret;
2831         map->async_ret = 0;
2832         spin_unlock_irqrestore(&map->async_lock, flags);
2833
2834         trace_regmap_async_complete_done(map);
2835
2836         return ret;
2837 }
2838 EXPORT_SYMBOL_GPL(regmap_async_complete);
2839
2840 /**
2841  * regmap_register_patch - Register and apply register updates to be applied
2842  *                         on device initialistion
2843  *
2844  * @map: Register map to apply updates to.
2845  * @regs: Values to update.
2846  * @num_regs: Number of entries in regs.
2847  *
2848  * Register a set of register updates to be applied to the device
2849  * whenever the device registers are synchronised with the cache and
2850  * apply them immediately.  Typically this is used to apply
2851  * corrections to be applied to the device defaults on startup, such
2852  * as the updates some vendors provide to undocumented registers.
2853  *
2854  * The caller must ensure that this function cannot be called
2855  * concurrently with either itself or regcache_sync().
2856  */
2857 int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
2858                           int num_regs)
2859 {
2860         struct reg_sequence *p;
2861         int ret;
2862         bool bypass;
2863
2864         if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2865             num_regs))
2866                 return 0;
2867
2868         p = krealloc(map->patch,
2869                      sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
2870                      GFP_KERNEL);
2871         if (p) {
2872                 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2873                 map->patch = p;
2874                 map->patch_regs += num_regs;
2875         } else {
2876                 return -ENOMEM;
2877         }
2878
2879         map->lock(map->lock_arg);
2880
2881         bypass = map->cache_bypass;
2882
2883         map->cache_bypass = true;
2884         map->async = true;
2885
2886         ret = _regmap_multi_reg_write(map, regs, num_regs);
2887
2888         map->async = false;
2889         map->cache_bypass = bypass;
2890
2891         map->unlock(map->lock_arg);
2892
2893         regmap_async_complete(map);
2894
2895         return ret;
2896 }
2897 EXPORT_SYMBOL_GPL(regmap_register_patch);
2898
2899 /**
2900  * regmap_get_val_bytes() - Report the size of a register value
2901  *
2902  * @map: Register map to operate on.
2903  *
2904  * Report the size of a register value, mainly intended to for use by
2905  * generic infrastructure built on top of regmap.
2906  */
2907 int regmap_get_val_bytes(struct regmap *map)
2908 {
2909         if (map->format.format_write)
2910                 return -EINVAL;
2911
2912         return map->format.val_bytes;
2913 }
2914 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2915
2916 /**
2917  * regmap_get_max_register() - Report the max register value
2918  *
2919  * @map: Register map to operate on.
2920  *
2921  * Report the max register value, mainly intended to for use by
2922  * generic infrastructure built on top of regmap.
2923  */
2924 int regmap_get_max_register(struct regmap *map)
2925 {
2926         return map->max_register ? map->max_register : -EINVAL;
2927 }
2928 EXPORT_SYMBOL_GPL(regmap_get_max_register);
2929
2930 /**
2931  * regmap_get_reg_stride() - Report the register address stride
2932  *
2933  * @map: Register map to operate on.
2934  *
2935  * Report the register address stride, mainly intended to for use by
2936  * generic infrastructure built on top of regmap.
2937  */
2938 int regmap_get_reg_stride(struct regmap *map)
2939 {
2940         return map->reg_stride;
2941 }
2942 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
2943
2944 int regmap_parse_val(struct regmap *map, const void *buf,
2945                         unsigned int *val)
2946 {
2947         if (!map->format.parse_val)
2948                 return -EINVAL;
2949
2950         *val = map->format.parse_val(buf);
2951
2952         return 0;
2953 }
2954 EXPORT_SYMBOL_GPL(regmap_parse_val);
2955
2956 static int __init regmap_initcall(void)
2957 {
2958         regmap_debugfs_initcall();
2959
2960         return 0;
2961 }
2962 postcore_initcall(regmap_initcall);