drivers/base/regmap/regmap.c

   1 /*
   2  * Register map access API
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <[email protected]>
   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
  24 #define CREATE_TRACE_POINTS
  25 #include "trace.h"
  26
  27 #include "internal.h"
  28
  29 /*
  30  * Sometimes for failures during very early init the trace
  31  * infrastructure isn't available early enough to be used.  For this
  32  * sort of problem defining LOG_DEVICE will add printks for basic
  33  * register I/O on a specific device.
  34  */
  35 #undef LOG_DEVICE
  36
  37 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
  38                                unsigned int mask, unsigned int val,
  39                                bool *change, bool force_write);
  40
  41 static int _regmap_bus_reg_read(void *context, unsigned int reg,
  42                                 unsigned int *val);
  43 static int _regmap_bus_read(void *context, unsigned int reg,
  44                             unsigned int *val);
  45 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
  46                                        unsigned int val);
  47 static int _regmap_bus_reg_write(void *context, unsigned int reg,
  48                                  unsigned int val);
  49 static int _regmap_bus_raw_write(void *context, unsigned int reg,
  50                                  unsigned int val);
  51
  52 bool regmap_reg_in_ranges(unsigned int reg,
  53                           const struct regmap_range *ranges,
  54                           unsigned int nranges)
  55 {
  56         const struct regmap_range *r;
  57         int i;
  58
  59         for (i = 0, r = ranges; i < nranges; i++, r++)
  60                 if (regmap_reg_in_range(reg, r))
  61                         return true;
  62         return false;
  63 }
  64 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
  65
  66 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
  67                               const struct regmap_access_table *table)
  68 {
  69         /* Check "no ranges" first */
  70         if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
  71                 return false;
  72
  73         /* In case zero "yes ranges" are supplied, any reg is OK */
  74         if (!table->n_yes_ranges)
  75                 return true;
  76
  77         return regmap_reg_in_ranges(reg, table->yes_ranges,
  78                                     table->n_yes_ranges);
  79 }
  80 EXPORT_SYMBOL_GPL(regmap_check_range_table);
  81
  82 bool regmap_writeable(struct regmap *map, unsigned int reg)
  83 {
  84         if (map->max_register && reg > map->max_register)
  85                 return false;
  86
  87         if (map->writeable_reg)
  88                 return map->writeable_reg(map->dev, reg);
  89
  90         if (map->wr_table)
  91                 return regmap_check_range_table(map, reg, map->wr_table);
  92
  93         return true;
  94 }
  95
  96 bool regmap_cached(struct regmap *map, unsigned int reg)
  97 {
  98         int ret;
  99         unsigned int val;
 100
 101         if (map->cache == REGCACHE_NONE)
 102                 return false;
 103
 104         if (!map->cache_ops)
 105                 return false;
 106
 107         if (map->max_register && reg > map->max_register)
 108                 return false;
 109
 110         map->lock(map->lock_arg);
 111         ret = regcache_read(map, reg, &val);
 112         map->unlock(map->lock_arg);
 113         if (ret)
 114                 return false;
 115
 116         return true;
 117 }
 118
 119 bool regmap_readable(struct regmap *map, unsigned int reg)
 120 {
 121         if (!map->reg_read)
 122                 return false;
 123
 124         if (map->max_register && reg > map->max_register)
 125                 return false;
 126
 127         if (map->format.format_write)
 128                 return false;
 129
 130         if (map->readable_reg)
 131                 return map->readable_reg(map->dev, reg);
 132
 133         if (map->rd_table)
 134                 return regmap_check_range_table(map, reg, map->rd_table);
 135
 136         return true;
 137 }
 138
 139 bool regmap_volatile(struct regmap *map, unsigned int reg)
 140 {
 141         if (!map->format.format_write && !regmap_readable(map, reg))
 142                 return false;
 143
 144         if (map->volatile_reg)
 145                 return map->volatile_reg(map->dev, reg);
 146
 147         if (map->volatile_table)
 148                 return regmap_check_range_table(map, reg, map->volatile_table);
 149
 150         if (map->cache_ops)
 151                 return false;
 152         else
 153                 return true;
 154 }
 155
 156 bool regmap_precious(struct regmap *map, unsigned int reg)
 157 {
 158         if (!regmap_readable(map, reg))
 159                 return false;
 160
 161         if (map->precious_reg)
 162                 return map->precious_reg(map->dev, reg);
 163
 164         if (map->precious_table)
 165                 return regmap_check_range_table(map, reg, map->precious_table);
 166
 167         return false;
 168 }
 169
 170 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
 171         size_t num)
 172 {
 173         unsigned int i;
 174
 175         for (i = 0; i < num; i++)
 176                 if (!regmap_volatile(map, reg + i))
 177                         return false;
 178
 179         return true;
 180 }
 181
 182 static void regmap_format_2_6_write(struct regmap *map,
 183                                      unsigned int reg, unsigned int val)
 184 {
 185         u8 *out = map->work_buf;
 186
 187         *out = (reg << 6) | val;
 188 }
 189
 190 static void regmap_format_4_12_write(struct regmap *map,
 191                                      unsigned int reg, unsigned int val)
 192 {
 193         __be16 *out = map->work_buf;
 194         *out = cpu_to_be16((reg << 12) | val);
 195 }
 196
 197 static void regmap_format_7_9_write(struct regmap *map,
 198                                     unsigned int reg, unsigned int val)
 199 {
 200         __be16 *out = map->work_buf;
 201         *out = cpu_to_be16((reg << 9) | val);
 202 }
 203
 204 static void regmap_format_10_14_write(struct regmap *map,
 205                                     unsigned int reg, unsigned int val)
 206 {
 207         u8 *out = map->work_buf;
 208
 209         out[2] = val;
 210         out[1] = (val >> 8) | (reg << 6);
 211         out[0] = reg >> 2;
 212 }
 213
 214 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 215 {
 216         u8 *b = buf;
 217
 218         b[0] = val << shift;
 219 }
 220
 221 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
 222 {
 223         __be16 *b = buf;
 224
 225         b[0] = cpu_to_be16(val << shift);
 226 }
 227
 228 static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
 229 {
 230         __le16 *b = buf;
 231
 232         b[0] = cpu_to_le16(val << shift);
 233 }
 234
 235 static void regmap_format_16_native(void *buf, unsigned int val,
 236                                     unsigned int shift)
 237 {
 238         *(u16 *)buf = val << shift;
 239 }
 240
 241 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 242 {
 243         u8 *b = buf;
 244
 245         val <<= shift;
 246
 247         b[0] = val >> 16;
 248         b[1] = val >> 8;
 249         b[2] = val;
 250 }
 251
 252 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
 253 {
 254         __be32 *b = buf;
 255
 256         b[0] = cpu_to_be32(val << shift);
 257 }
 258
 259 static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
 260 {
 261         __le32 *b = buf;
 262
 263         b[0] = cpu_to_le32(val << shift);
 264 }
 265
 266 static void regmap_format_32_native(void *buf, unsigned int val,
 267                                     unsigned int shift)
 268 {
 269         *(u32 *)buf = val << shift;
 270 }
 271
 272 #ifdef CONFIG_64BIT
 273 static void regmap_format_64_be(void *buf, unsigned int val, unsigned int shift)
 274 {
 275         __be64 *b = buf;
 276
 277         b[0] = cpu_to_be64((u64)val << shift);
 278 }
 279
 280 static void regmap_format_64_le(void *buf, unsigned int val, unsigned int shift)
 281 {
 282         __le64 *b = buf;
 283
 284         b[0] = cpu_to_le64((u64)val << shift);
 285 }
 286
 287 static void regmap_format_64_native(void *buf, unsigned int val,
 288                                     unsigned int shift)
 289 {
 290         *(u64 *)buf = (u64)val << shift;
 291 }
 292 #endif
 293
 294 static void regmap_parse_inplace_noop(void *buf)
 295 {
 296 }
 297
 298 static unsigned int regmap_parse_8(const void *buf)
 299 {
 300         const u8 *b = buf;
 301
 302         return b[0];
 303 }
 304
 305 static unsigned int regmap_parse_16_be(const void *buf)
 306 {
 307         const __be16 *b = buf;
 308
 309         return be16_to_cpu(b[0]);
 310 }
 311
 312 static unsigned int regmap_parse_16_le(const void *buf)
 313 {
 314         const __le16 *b = buf;
 315
 316         return le16_to_cpu(b[0]);
 317 }
 318
 319 static void regmap_parse_16_be_inplace(void *buf)
 320 {
 321         __be16 *b = buf;
 322
 323         b[0] = be16_to_cpu(b[0]);
 324 }
 325
 326 static void regmap_parse_16_le_inplace(void *buf)
 327 {
 328         __le16 *b = buf;
 329
 330         b[0] = le16_to_cpu(b[0]);
 331 }
 332
 333 static unsigned int regmap_parse_16_native(const void *buf)
 334 {
 335         return *(u16 *)buf;
 336 }
 337
 338 static unsigned int regmap_parse_24(const void *buf)
 339 {
 340         const u8 *b = buf;
 341         unsigned int ret = b[2];
 342         ret |= ((unsigned int)b[1]) << 8;
 343         ret |= ((unsigned int)b[0]) << 16;
 344
 345         return ret;
 346 }
 347
 348 static unsigned int regmap_parse_32_be(const void *buf)
 349 {
 350         const __be32 *b = buf;
 351
 352         return be32_to_cpu(b[0]);
 353 }
 354
 355 static unsigned int regmap_parse_32_le(const void *buf)
 356 {
 357         const __le32 *b = buf;
 358
 359         return le32_to_cpu(b[0]);
 360 }
 361
 362 static void regmap_parse_32_be_inplace(void *buf)
 363 {
 364         __be32 *b = buf;
 365
 366         b[0] = be32_to_cpu(b[0]);
 367 }
 368
 369 static void regmap_parse_32_le_inplace(void *buf)
 370 {
 371         __le32 *b = buf;
 372
 373         b[0] = le32_to_cpu(b[0]);
 374 }
 375
 376 static unsigned int regmap_parse_32_native(const void *buf)
 377 {
 378         return *(u32 *)buf;
 379 }
 380
 381 #ifdef CONFIG_64BIT
 382 static unsigned int regmap_parse_64_be(const void *buf)
 383 {
 384         const __be64 *b = buf;
 385
 386         return be64_to_cpu(b[0]);
 387 }
 388
 389 static unsigned int regmap_parse_64_le(const void *buf)
 390 {
 391         const __le64 *b = buf;
 392
 393         return le64_to_cpu(b[0]);
 394 }
 395
 396 static void regmap_parse_64_be_inplace(void *buf)
 397 {
 398         __be64 *b = buf;
 399
 400         b[0] = be64_to_cpu(b[0]);
 401 }
 402
 403 static void regmap_parse_64_le_inplace(void *buf)
 404 {
 405         __le64 *b = buf;
 406
 407         b[0] = le64_to_cpu(b[0]);
 408 }
 409
 410 static unsigned int regmap_parse_64_native(const void *buf)
 411 {
 412         return *(u64 *)buf;
 413 }
 414 #endif
 415
 416 static void regmap_lock_mutex(void *__map)
 417 {
 418         struct regmap *map = __map;
 419         mutex_lock(&map->mutex);
 420 }
 421
 422 static void regmap_unlock_mutex(void *__map)
 423 {
 424         struct regmap *map = __map;
 425         mutex_unlock(&map->mutex);
 426 }
 427
 428 static void regmap_lock_spinlock(void *__map)
 429 __acquires(&map->spinlock)
 430 {
 431         struct regmap *map = __map;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&map->spinlock, flags);
 435         map->spinlock_flags = flags;
 436 }
 437
 438 static void regmap_unlock_spinlock(void *__map)
 439 __releases(&map->spinlock)
 440 {
 441         struct regmap *map = __map;
 442         spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
 443 }
 444
 445 static void dev_get_regmap_release(struct device *dev, void *res)
 446 {
 447         /*
 448          * We don't actually have anything to do here; the goal here
 449          * is not to manage the regmap but to provide a simple way to
 450          * get the regmap back given a struct device.
 451          */
 452 }
 453
 454 static bool _regmap_range_add(struct regmap *map,
 455                               struct regmap_range_node *data)
 456 {
 457         struct rb_root *root = &map->range_tree;
 458         struct rb_node **new = &(root->rb_node), *parent = NULL;
 459
 460         while (*new) {
 461                 struct regmap_range_node *this =
 462                         container_of(*new, struct regmap_range_node, node);
 463
 464                 parent = *new;
 465                 if (data->range_max < this->range_min)
 466                         new = &((*new)->rb_left);
 467                 else if (data->range_min > this->range_max)
 468                         new = &((*new)->rb_right);
 469                 else
 470                         return false;
 471         }
 472
 473         rb_link_node(&data->node, parent, new);
 474         rb_insert_color(&data->node, root);
 475
 476         return true;
 477 }
 478
 479 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
 480                                                       unsigned int reg)
 481 {
 482         struct rb_node *node = map->range_tree.rb_node;
 483
 484         while (node) {
 485                 struct regmap_range_node *this =
 486                         container_of(node, struct regmap_range_node, node);
 487
 488                 if (reg < this->range_min)
 489                         node = node->rb_left;
 490                 else if (reg > this->range_max)
 491                         node = node->rb_right;
 492                 else
 493                         return this;
 494         }
 495
 496         return NULL;
 497 }
 498
 499 static void regmap_range_exit(struct regmap *map)
 500 {
 501         struct rb_node *next;
 502         struct regmap_range_node *range_node;
 503
 504         next = rb_first(&map->range_tree);
 505         while (next) {
 506                 range_node = rb_entry(next, struct regmap_range_node, node);
 507                 next = rb_next(&range_node->node);
 508                 rb_erase(&range_node->node, &map->range_tree);
 509                 kfree(range_node);
 510         }
 511
 512         kfree(map->selector_work_buf);
 513 }
 514
 515 int regmap_attach_dev(struct device *dev, struct regmap *map,
 516                       const struct regmap_config *config)
 517 {
 518         struct regmap **m;
 519
 520         map->dev = dev;
 521
 522         regmap_debugfs_init(map, config->name);
 523
 524         /* Add a devres resource for dev_get_regmap() */
 525         m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
 526         if (!m) {
 527                 regmap_debugfs_exit(map);
 528                 return -ENOMEM;
 529         }
 530         *m = map;
 531         devres_add(dev, m);
 532
 533         return 0;
 534 }
 535 EXPORT_SYMBOL_GPL(regmap_attach_dev);
 536
 537 static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
 538                                         const struct regmap_config *config)
 539 {
 540         enum regmap_endian endian;
 541
 542         /* Retrieve the endianness specification from the regmap config */
 543         endian = config->reg_format_endian;
 544
 545         /* If the regmap config specified a non-default value, use that */
 546         if (endian != REGMAP_ENDIAN_DEFAULT)
 547                 return endian;
 548
 549         /* Retrieve the endianness specification from the bus config */
 550         if (bus && bus->reg_format_endian_default)
 551                 endian = bus->reg_format_endian_default;
 552
 553         /* If the bus specified a non-default value, use that */
 554         if (endian != REGMAP_ENDIAN_DEFAULT)
 555                 return endian;
 556
 557         /* Use this if no other value was found */
 558         return REGMAP_ENDIAN_BIG;
 559 }
 560
 561 enum regmap_endian regmap_get_val_endian(struct device *dev,
 562                                          const struct regmap_bus *bus,
 563                                          const struct regmap_config *config)
 564 {
 565         struct device_node *np;
 566         enum regmap_endian endian;
 567
 568         /* Retrieve the endianness specification from the regmap config */
 569         endian = config->val_format_endian;
 570
 571         /* If the regmap config specified a non-default value, use that */
 572         if (endian != REGMAP_ENDIAN_DEFAULT)
 573                 return endian;
 574
 575         /* If the dev and dev->of_node exist try to get endianness from DT */
 576         if (dev && dev->of_node) {
 577                 np = dev->of_node;
 578
 579                 /* Parse the device's DT node for an endianness specification */
 580                 if (of_property_read_bool(np, "big-endian"))
 581                         endian = REGMAP_ENDIAN_BIG;
 582                 else if (of_property_read_bool(np, "little-endian"))
 583                         endian = REGMAP_ENDIAN_LITTLE;
 584                 else if (of_property_read_bool(np, "native-endian"))
 585                         endian = REGMAP_ENDIAN_NATIVE;
 586
 587                 /* If the endianness was specified in DT, use that */
 588                 if (endian != REGMAP_ENDIAN_DEFAULT)
 589                         return endian;
 590         }
 591
 592         /* Retrieve the endianness specification from the bus config */
 593         if (bus && bus->val_format_endian_default)
 594                 endian = bus->val_format_endian_default;
 595
 596         /* If the bus specified a non-default value, use that */
 597         if (endian != REGMAP_ENDIAN_DEFAULT)
 598                 return endian;
 599
 600         /* Use this if no other value was found */
 601         return REGMAP_ENDIAN_BIG;
 602 }
 603 EXPORT_SYMBOL_GPL(regmap_get_val_endian);
 604
 605 struct regmap *__regmap_init(struct device *dev,
 606                              const struct regmap_bus *bus,
 607                              void *bus_context,
 608                              const struct regmap_config *config,
 609                              struct lock_class_key *lock_key,
 610                              const char *lock_name)
 611 {
 612         struct regmap *map;
 613         int ret = -EINVAL;
 614         enum regmap_endian reg_endian, val_endian;
 615         int i, j;
 616
 617         if (!config)
 618                 goto err;
 619
 620         map = kzalloc(sizeof(*map), GFP_KERNEL);
 621         if (map == NULL) {
 622                 ret = -ENOMEM;
 623                 goto err;
 624         }
 625
 626         if (config->lock && config->unlock) {
 627                 map->lock = config->lock;
 628                 map->unlock = config->unlock;
 629                 map->lock_arg = config->lock_arg;
 630         } else {
 631                 if ((bus && bus->fast_io) ||
 632                     config->fast_io) {
 633                         spin_lock_init(&map->spinlock);
 634                         map->lock = regmap_lock_spinlock;
 635                         map->unlock = regmap_unlock_spinlock;
 636                         lockdep_set_class_and_name(&map->spinlock,
 637                                                    lock_key, lock_name);
 638                 } else {
 639                         mutex_init(&map->mutex);
 640                         map->lock = regmap_lock_mutex;
 641                         map->unlock = regmap_unlock_mutex;
 642                         lockdep_set_class_and_name(&map->mutex,
 643                                                    lock_key, lock_name);
 644                 }
 645                 map->lock_arg = map;
 646         }
 647
 648         /*
 649          * When we write in fast-paths with regmap_bulk_write() don't allocate
 650          * scratch buffers with sleeping allocations.
 651          */
 652         if ((bus && bus->fast_io) || config->fast_io)
 653                 map->alloc_flags = GFP_ATOMIC;
 654         else
 655                 map->alloc_flags = GFP_KERNEL;
 656
 657         map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 658         map->format.pad_bytes = config->pad_bits / 8;
 659         map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 660         map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
 661                         config->val_bits + config->pad_bits, 8);
 662         map->reg_shift = config->pad_bits % 8;
 663         if (config->reg_stride)
 664                 map->reg_stride = config->reg_stride;
 665         else
 666                 map->reg_stride = 1;
 667         if (is_power_of_2(map->reg_stride))
 668                 map->reg_stride_order = ilog2(map->reg_stride);
 669         else
 670                 map->reg_stride_order = -1;
 671         map->use_single_read = config->use_single_rw || !bus || !bus->read;
 672         map->use_single_write = config->use_single_rw || !bus || !bus->write;
 673         map->can_multi_write = config->can_multi_write && bus && bus->write;
 674         if (bus) {
 675                 map->max_raw_read = bus->max_raw_read;
 676                 map->max_raw_write = bus->max_raw_write;
 677         }
 678         map->dev = dev;
 679         map->bus = bus;
 680         map->bus_context = bus_context;
 681         map->max_register = config->max_register;
 682         map->wr_table = config->wr_table;
 683         map->rd_table = config->rd_table;
 684         map->volatile_table = config->volatile_table;
 685         map->precious_table = config->precious_table;
 686         map->writeable_reg = config->writeable_reg;
 687         map->readable_reg = config->readable_reg;
 688         map->volatile_reg = config->volatile_reg;
 689         map->precious_reg = config->precious_reg;
 690         map->cache_type = config->cache_type;
 691         map->name = config->name;
 692
 693         spin_lock_init(&map->async_lock);
 694         INIT_LIST_HEAD(&map->async_list);
 695         INIT_LIST_HEAD(&map->async_free);
 696         init_waitqueue_head(&map->async_waitq);
 697
 698         if (config->read_flag_mask || config->write_flag_mask) {
 699                 map->read_flag_mask = config->read_flag_mask;
 700                 map->write_flag_mask = config->write_flag_mask;
 701         } else if (bus) {
 702                 map->read_flag_mask = bus->read_flag_mask;
 703         }
 704
 705         if (!bus) {
 706                 map->reg_read  = config->reg_read;
 707                 map->reg_write = config->reg_write;
 708
 709                 map->defer_caching = false;
 710                 goto skip_format_initialization;
 711         } else if (!bus->read || !bus->write) {
 712                 map->reg_read = _regmap_bus_reg_read;
 713                 map->reg_write = _regmap_bus_reg_write;
 714
 715                 map->defer_caching = false;
 716                 goto skip_format_initialization;
 717         } else {
 718                 map->reg_read  = _regmap_bus_read;
 719                 map->reg_update_bits = bus->reg_update_bits;
 720         }
 721
 722         reg_endian = regmap_get_reg_endian(bus, config);
 723         val_endian = regmap_get_val_endian(dev, bus, config);
 724
 725         switch (config->reg_bits + map->reg_shift) {
 726         case 2:
 727                 switch (config->val_bits) {
 728                 case 6:
 729                         map->format.format_write = regmap_format_2_6_write;
 730                         break;
 731                 default:
 732                         goto err_map;
 733                 }
 734                 break;
 735
 736         case 4:
 737                 switch (config->val_bits) {
 738                 case 12:
 739                         map->format.format_write = regmap_format_4_12_write;
 740                         break;
 741                 default:
 742                         goto err_map;
 743                 }
 744                 break;
 745
 746         case 7:
 747                 switch (config->val_bits) {
 748                 case 9:
 749                         map->format.format_write = regmap_format_7_9_write;
 750                         break;
 751                 default:
 752                         goto err_map;
 753                 }
 754                 break;
 755
 756         case 10:
 757                 switch (config->val_bits) {
 758                 case 14:
 759                         map->format.format_write = regmap_format_10_14_write;
 760                         break;
 761                 default:
 762                         goto err_map;
 763                 }
 764                 break;
 765
 766         case 8:
 767                 map->format.format_reg = regmap_format_8;
 768                 break;
 769
 770         case 16:
 771                 switch (reg_endian) {
 772                 case REGMAP_ENDIAN_BIG:
 773                         map->format.format_reg = regmap_format_16_be;
 774                         break;
 775                 case REGMAP_ENDIAN_LITTLE:
 776                         map->format.format_reg = regmap_format_16_le;
 777                         break;
 778                 case REGMAP_ENDIAN_NATIVE:
 779                         map->format.format_reg = regmap_format_16_native;
 780                         break;
 781                 default:
 782                         goto err_map;
 783                 }
 784                 break;
 785
 786         case 24:
 787                 if (reg_endian != REGMAP_ENDIAN_BIG)
 788                         goto err_map;
 789                 map->format.format_reg = regmap_format_24;
 790                 break;
 791
 792         case 32:
 793                 switch (reg_endian) {
 794                 case REGMAP_ENDIAN_BIG:
 795                         map->format.format_reg = regmap_format_32_be;
 796                         break;
 797                 case REGMAP_ENDIAN_LITTLE:
 798                         map->format.format_reg = regmap_format_32_le;
 799                         break;
 800                 case REGMAP_ENDIAN_NATIVE:
 801                         map->format.format_reg = regmap_format_32_native;
 802                         break;
 803                 default:
 804                         goto err_map;
 805                 }
 806                 break;
 807
 808 #ifdef CONFIG_64BIT
 809         case 64:
 810                 switch (reg_endian) {
 811                 case REGMAP_ENDIAN_BIG:
 812                         map->format.format_reg = regmap_format_64_be;
 813                         break;
 814                 case REGMAP_ENDIAN_LITTLE:
 815                         map->format.format_reg = regmap_format_64_le;
 816                         break;
 817                 case REGMAP_ENDIAN_NATIVE:
 818                         map->format.format_reg = regmap_format_64_native;
 819                         break;
 820                 default:
 821                         goto err_map;
 822                 }
 823                 break;
 824 #endif
 825
 826         default:
 827                 goto err_map;
 828         }
 829
 830         if (val_endian == REGMAP_ENDIAN_NATIVE)
 831                 map->format.parse_inplace = regmap_parse_inplace_noop;
 832
 833         switch (config->val_bits) {
 834         case 8:
 835                 map->format.format_val = regmap_format_8;
 836                 map->format.parse_val = regmap_parse_8;
 837                 map->format.parse_inplace = regmap_parse_inplace_noop;
 838                 break;
 839         case 16:
 840                 switch (val_endian) {
 841                 case REGMAP_ENDIAN_BIG:
 842                         map->format.format_val = regmap_format_16_be;
 843                         map->format.parse_val = regmap_parse_16_be;
 844                         map->format.parse_inplace = regmap_parse_16_be_inplace;
 845                         break;
 846                 case REGMAP_ENDIAN_LITTLE:
 847                         map->format.format_val = regmap_format_16_le;
 848                         map->format.parse_val = regmap_parse_16_le;
 849                         map->format.parse_inplace = regmap_parse_16_le_inplace;
 850                         break;
 851                 case REGMAP_ENDIAN_NATIVE:
 852                         map->format.format_val = regmap_format_16_native;
 853                         map->format.parse_val = regmap_parse_16_native;
 854                         break;
 855                 default:
 856                         goto err_map;
 857                 }
 858                 break;
 859         case 24:
 860                 if (val_endian != REGMAP_ENDIAN_BIG)
 861                         goto err_map;
 862                 map->format.format_val = regmap_format_24;
 863                 map->format.parse_val = regmap_parse_24;
 864                 break;
 865         case 32:
 866                 switch (val_endian) {
 867                 case REGMAP_ENDIAN_BIG:
 868                         map->format.format_val = regmap_format_32_be;
 869                         map->format.parse_val = regmap_parse_32_be;
 870                         map->format.parse_inplace = regmap_parse_32_be_inplace;
 871                         break;
 872                 case REGMAP_ENDIAN_LITTLE:
 873                         map->format.format_val = regmap_format_32_le;
 874                         map->format.parse_val = regmap_parse_32_le;
 875                         map->format.parse_inplace = regmap_parse_32_le_inplace;
 876                         break;
 877                 case REGMAP_ENDIAN_NATIVE:
 878                         map->format.format_val = regmap_format_32_native;
 879                         map->format.parse_val = regmap_parse_32_native;
 880                         break;
 881                 default:
 882                         goto err_map;
 883                 }
 884                 break;
 885 #ifdef CONFIG_64BIT
 886         case 64:
 887                 switch (val_endian) {
 888                 case REGMAP_ENDIAN_BIG:
 889                         map->format.format_val = regmap_format_64_be;
 890                         map->format.parse_val = regmap_parse_64_be;
 891                         map->format.parse_inplace = regmap_parse_64_be_inplace;
 892                         break;
 893                 case REGMAP_ENDIAN_LITTLE:
 894                         map->format.format_val = regmap_format_64_le;
 895                         map->format.parse_val = regmap_parse_64_le;
 896                         map->format.parse_inplace = regmap_parse_64_le_inplace;
 897                         break;
 898                 case REGMAP_ENDIAN_NATIVE:
 899                         map->format.format_val = regmap_format_64_native;
 900                         map->format.parse_val = regmap_parse_64_native;
 901                         break;
 902                 default:
 903                         goto err_map;
 904                 }
 905                 break;
 906 #endif
 907         }
 908
 909         if (map->format.format_write) {
 910                 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
 911                     (val_endian != REGMAP_ENDIAN_BIG))
 912                         goto err_map;
 913                 map->use_single_write = true;
 914         }
 915
 916         if (!map->format.format_write &&
 917             !(map->format.format_reg && map->format.format_val))
 918                 goto err_map;
 919
 920         map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
 921         if (map->work_buf == NULL) {
 922                 ret = -ENOMEM;
 923                 goto err_map;
 924         }
 925
 926         if (map->format.format_write) {
 927                 map->defer_caching = false;
 928                 map->reg_write = _regmap_bus_formatted_write;
 929         } else if (map->format.format_val) {
 930                 map->defer_caching = true;
 931                 map->reg_write = _regmap_bus_raw_write;
 932         }
 933
 934 skip_format_initialization:
 935
 936         map->range_tree = RB_ROOT;
 937         for (i = 0; i < config->num_ranges; i++) {
 938                 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
 939                 struct regmap_range_node *new;
 940
 941                 /* Sanity check */
 942                 if (range_cfg->range_max < range_cfg->range_min) {
 943                         dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
 944                                 range_cfg->range_max, range_cfg->range_min);
 945                         goto err_range;
 946                 }
 947
 948                 if (range_cfg->range_max > map->max_register) {
 949                         dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
 950                                 range_cfg->range_max, map->max_register);
 951                         goto err_range;
 952                 }
 953
 954                 if (range_cfg->selector_reg > map->max_register) {
 955                         dev_err(map->dev,
 956                                 "Invalid range %d: selector out of map\n", i);
 957                         goto err_range;
 958                 }
 959
 960                 if (range_cfg->window_len == 0) {
 961                         dev_err(map->dev, "Invalid range %d: window_len 0\n",
 962                                 i);
 963                         goto err_range;
 964                 }
 965
 966                 /* Make sure, that this register range has no selector
 967                    or data window within its boundary */
 968                 for (j = 0; j < config->num_ranges; j++) {
 969                         unsigned sel_reg = config->ranges[j].selector_reg;
 970                         unsigned win_min = config->ranges[j].window_start;
 971                         unsigned win_max = win_min +
 972                                            config->ranges[j].window_len - 1;
 973
 974                         /* Allow data window inside its own virtual range */
 975                         if (j == i)
 976                                 continue;
 977
 978                         if (range_cfg->range_min <= sel_reg &&
 979                             sel_reg <= range_cfg->range_max) {
 980                                 dev_err(map->dev,
 981                                         "Range %d: selector for %d in window\n",
 982                                         i, j);
 983                                 goto err_range;
 984                         }
 985
 986                         if (!(win_max < range_cfg->range_min ||
 987                               win_min > range_cfg->range_max)) {
 988                                 dev_err(map->dev,
 989                                         "Range %d: window for %d in window\n",
 990                                         i, j);
 991                                 goto err_range;
 992                         }
 993                 }
 994
 995                 new = kzalloc(sizeof(*new), GFP_KERNEL);
 996                 if (new == NULL) {
 997                         ret = -ENOMEM;
 998                         goto err_range;
 999                 }
1000
1001                 new->map = map;
1002                 new->name = range_cfg->name;
1003                 new->range_min = range_cfg->range_min;
1004                 new->range_max = range_cfg->range_max;
1005                 new->selector_reg = range_cfg->selector_reg;
1006                 new->selector_mask = range_cfg->selector_mask;
1007                 new->selector_shift = range_cfg->selector_shift;
1008                 new->window_start = range_cfg->window_start;
1009                 new->window_len = range_cfg->window_len;
1010
1011                 if (!_regmap_range_add(map, new)) {
1012                         dev_err(map->dev, "Failed to add range %d\n", i);
1013                         kfree(new);
1014                         goto err_range;
1015                 }
1016
1017                 if (map->selector_work_buf == NULL) {
1018                         map->selector_work_buf =
1019                                 kzalloc(map->format.buf_size, GFP_KERNEL);
1020                         if (map->selector_work_buf == NULL) {
1021                                 ret = -ENOMEM;
1022                                 goto err_range;
1023                         }
1024                 }
1025         }
1026
1027         ret = regcache_init(map, config);
1028         if (ret != 0)
1029                 goto err_range;
1030
1031         if (dev) {
1032                 ret = regmap_attach_dev(dev, map, config);
1033                 if (ret != 0)
1034                         goto err_regcache;
1035         }
1036
1037         return map;
1038
1039 err_regcache:
1040         regcache_exit(map);
1041 err_range:
1042         regmap_range_exit(map);
1043         kfree(map->work_buf);
1044 err_map:
1045         kfree(map);
1046 err:
1047         return ERR_PTR(ret);
1048 }
1049 EXPORT_SYMBOL_GPL(__regmap_init);
1050
1051 static void devm_regmap_release(struct device *dev, void *res)
1052 {
1053         regmap_exit(*(struct regmap **)res);
1054 }
1055
1056 struct regmap *__devm_regmap_init(struct device *dev,
1057                                   const struct regmap_bus *bus,
1058                                   void *bus_context,
1059                                   const struct regmap_config *config,
1060                                   struct lock_class_key *lock_key,
1061                                   const char *lock_name)
1062 {
1063         struct regmap **ptr, *regmap;
1064
1065         ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
1066         if (!ptr)
1067                 return ERR_PTR(-ENOMEM);
1068
1069         regmap = __regmap_init(dev, bus, bus_context, config,
1070                                lock_key, lock_name);
1071         if (!IS_ERR(regmap)) {
1072                 *ptr = regmap;
1073                 devres_add(dev, ptr);
1074         } else {
1075                 devres_free(ptr);
1076         }
1077
1078         return regmap;
1079 }
1080 EXPORT_SYMBOL_GPL(__devm_regmap_init);
1081
1082 static void regmap_field_init(struct regmap_field *rm_field,
1083         struct regmap *regmap, struct reg_field reg_field)
1084 {
1085         rm_field->regmap = regmap;
1086         rm_field->reg = reg_field.reg;
1087         rm_field->shift = reg_field.lsb;
1088         rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
1089         rm_field->id_size = reg_field.id_size;
1090         rm_field->id_offset = reg_field.id_offset;
1091 }
1092
1093 /**
1094  * devm_regmap_field_alloc(): Allocate and initialise a register field
1095  * in a register map.
1096  *
1097  * @dev: Device that will be interacted with
1098  * @regmap: regmap bank in which this register field is located.
1099  * @reg_field: Register field with in the bank.
1100  *
1101  * The return value will be an ERR_PTR() on error or a valid pointer
1102  * to a struct regmap_field. The regmap_field will be automatically freed
1103  * by the device management code.
1104  */
1105 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
1106                 struct regmap *regmap, struct reg_field reg_field)
1107 {
1108         struct regmap_field *rm_field = devm_kzalloc(dev,
1109                                         sizeof(*rm_field), GFP_KERNEL);
1110         if (!rm_field)
1111                 return ERR_PTR(-ENOMEM);
1112
1113         regmap_field_init(rm_field, regmap, reg_field);
1114
1115         return rm_field;
1116
1117 }
1118 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
1119
1120 /**
1121  * devm_regmap_field_free(): Free register field allocated using
1122  * devm_regmap_field_alloc. Usally drivers need not call this function,
1123  * as the memory allocated via devm will be freed as per device-driver
1124  * life-cyle.
1125  *
1126  * @dev: Device that will be interacted with
1127  * @field: regmap field which should be freed.
1128  */
1129 void devm_regmap_field_free(struct device *dev,
1130         struct regmap_field *field)
1131 {
1132         devm_kfree(dev, field);
1133 }
1134 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
1135
1136 /**
1137  * regmap_field_alloc(): Allocate and initialise a register field
1138  * in a register map.
1139  *
1140  * @regmap: regmap bank in which this register field is located.
1141  * @reg_field: Register field with in the bank.
1142  *
1143  * The return value will be an ERR_PTR() on error or a valid pointer
1144  * to a struct regmap_field. The regmap_field should be freed by the
1145  * user once its finished working with it using regmap_field_free().
1146  */
1147 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1148                 struct reg_field reg_field)
1149 {
1150         struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1151
1152         if (!rm_field)
1153                 return ERR_PTR(-ENOMEM);
1154
1155         regmap_field_init(rm_field, regmap, reg_field);
1156
1157         return rm_field;
1158 }
1159 EXPORT_SYMBOL_GPL(regmap_field_alloc);
1160
1161 /**
1162  * regmap_field_free(): Free register field allocated using regmap_field_alloc
1163  *
1164  * @field: regmap field which should be freed.
1165  */
1166 void regmap_field_free(struct regmap_field *field)
1167 {
1168         kfree(field);
1169 }
1170 EXPORT_SYMBOL_GPL(regmap_field_free);
1171
1172 /**
1173  * regmap_reinit_cache(): Reinitialise the current register cache
1174  *
1175  * @map: Register map to operate on.
1176  * @config: New configuration.  Only the cache data will be used.
1177  *
1178  * Discard any existing register cache for the map and initialize a
1179  * new cache.  This can be used to restore the cache to defaults or to
1180  * update the cache configuration to reflect runtime discovery of the
1181  * hardware.
1182  *
1183  * No explicit locking is done here, the user needs to ensure that
1184  * this function will not race with other calls to regmap.
1185  */
1186 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1187 {
1188         regcache_exit(map);
1189         regmap_debugfs_exit(map);
1190
1191         map->max_register = config->max_register;
1192         map->writeable_reg = config->writeable_reg;
1193         map->readable_reg = config->readable_reg;
1194         map->volatile_reg = config->volatile_reg;
1195         map->precious_reg = config->precious_reg;
1196         map->cache_type = config->cache_type;
1197
1198         regmap_debugfs_init(map, config->name);
1199
1200         map->cache_bypass = false;
1201         map->cache_only = false;
1202
1203         return regcache_init(map, config);
1204 }
1205 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1206
1207 /**
1208  * regmap_exit(): Free a previously allocated register map
1209  */
1210 void regmap_exit(struct regmap *map)
1211 {
1212         struct regmap_async *async;
1213
1214         regcache_exit(map);
1215         regmap_debugfs_exit(map);
1216         regmap_range_exit(map);
1217         if (map->bus && map->bus->free_context)
1218                 map->bus->free_context(map->bus_context);
1219         kfree(map->work_buf);
1220         while (!list_empty(&map->async_free)) {
1221                 async = list_first_entry_or_null(&map->async_free,
1222                                                  struct regmap_async,
1223                                                  list);
1224                 list_del(&async->list);
1225                 kfree(async->work_buf);
1226                 kfree(async);
1227         }
1228         kfree(map);
1229 }
1230 EXPORT_SYMBOL_GPL(regmap_exit);
1231
1232 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1233 {
1234         struct regmap **r = res;
1235         if (!r || !*r) {
1236                 WARN_ON(!r || !*r);
1237                 return 0;
1238         }
1239
1240         /* If the user didn't specify a name match any */
1241         if (data)
1242                 return (*r)->name == data;
1243         else
1244                 return 1;
1245 }
1246
1247 /**
1248  * dev_get_regmap(): Obtain the regmap (if any) for a device
1249  *
1250  * @dev: Device to retrieve the map for
1251  * @name: Optional name for the register map, usually NULL.
1252  *
1253  * Returns the regmap for the device if one is present, or NULL.  If
1254  * name is specified then it must match the name specified when
1255  * registering the device, if it is NULL then the first regmap found
1256  * will be used.  Devices with multiple register maps are very rare,
1257  * generic code should normally not need to specify a name.
1258  */
1259 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1260 {
1261         struct regmap **r = devres_find(dev, dev_get_regmap_release,
1262                                         dev_get_regmap_match, (void *)name);
1263
1264         if (!r)
1265                 return NULL;
1266         return *r;
1267 }
1268 EXPORT_SYMBOL_GPL(dev_get_regmap);
1269
1270 /**
1271  * regmap_get_device(): Obtain the device from a regmap
1272  *
1273  * @map: Register map to operate on.
1274  *
1275  * Returns the underlying device that the regmap has been created for.
1276  */
1277 struct device *regmap_get_device(struct regmap *map)
1278 {
1279         return map->dev;
1280 }
1281 EXPORT_SYMBOL_GPL(regmap_get_device);
1282
1283 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1284                                struct regmap_range_node *range,
1285                                unsigned int val_num)
1286 {
1287         void *orig_work_buf;
1288         unsigned int win_offset;
1289         unsigned int win_page;
1290         bool page_chg;
1291         int ret;
1292
1293         win_offset = (*reg - range->range_min) % range->window_len;
1294         win_page = (*reg - range->range_min) / range->window_len;
1295
1296         if (val_num > 1) {
1297                 /* Bulk write shouldn't cross range boundary */
1298                 if (*reg + val_num - 1 > range->range_max)
1299                         return -EINVAL;
1300
1301                 /* ... or single page boundary */
1302                 if (val_num > range->window_len - win_offset)
1303                         return -EINVAL;
1304         }
1305
1306         /* It is possible to have selector register inside data window.
1307            In that case, selector register is located on every page and
1308            it needs no page switching, when accessed alone. */
1309         if (val_num > 1 ||
1310             range->window_start + win_offset != range->selector_reg) {
1311                 /* Use separate work_buf during page switching */
1312                 orig_work_buf = map->work_buf;
1313                 map->work_buf = map->selector_work_buf;
1314
1315                 ret = _regmap_update_bits(map, range->selector_reg,
1316                                           range->selector_mask,
1317                                           win_page << range->selector_shift,
1318                                           &page_chg, false);
1319
1320                 map->work_buf = orig_work_buf;
1321
1322                 if (ret != 0)
1323                         return ret;
1324         }
1325
1326         *reg = range->window_start + win_offset;
1327
1328         return 0;
1329 }
1330
1331 static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes,
1332                                           unsigned long mask)
1333 {
1334         u8 *buf;
1335         int i;
1336
1337         if (!mask || !map->work_buf)
1338                 return;
1339
1340         buf = map->work_buf;
1341
1342         for (i = 0; i < max_bytes; i++)
1343                 buf[i] |= (mask >> (8 * i)) & 0xff;
1344 }
1345
1346 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1347                       const void *val, size_t val_len)
1348 {
1349         struct regmap_range_node *range;
1350         unsigned long flags;
1351         void *work_val = map->work_buf + map->format.reg_bytes +
1352                 map->format.pad_bytes;
1353         void *buf;
1354         int ret = -ENOTSUPP;
1355         size_t len;
1356         int i;
1357
1358         WARN_ON(!map->bus);
1359
1360         /* Check for unwritable registers before we start */
1361         if (map->writeable_reg)
1362                 for (i = 0; i < val_len / map->format.val_bytes; i++)
1363                         if (!map->writeable_reg(map->dev,
1364                                                reg + regmap_get_offset(map, i)))
1365                                 return -EINVAL;
1366
1367         if (!map->cache_bypass && map->format.parse_val) {
1368                 unsigned int ival;
1369                 int val_bytes = map->format.val_bytes;
1370                 for (i = 0; i < val_len / val_bytes; i++) {
1371                         ival = map->format.parse_val(val + (i * val_bytes));
1372                         ret = regcache_write(map,
1373                                              reg + regmap_get_offset(map, i),
1374                                              ival);
1375                         if (ret) {
1376                                 dev_err(map->dev,
1377                                         "Error in caching of register: %x ret: %d\n",
1378                                         reg + i, ret);
1379                                 return ret;
1380                         }
1381                 }
1382                 if (map->cache_only) {
1383                         map->cache_dirty = true;
1384                         return 0;
1385                 }
1386         }
1387
1388         range = _regmap_range_lookup(map, reg);
1389         if (range) {
1390                 int val_num = val_len / map->format.val_bytes;
1391                 int win_offset = (reg - range->range_min) % range->window_len;
1392                 int win_residue = range->window_len - win_offset;
1393
1394                 /* If the write goes beyond the end of the window split it */
1395                 while (val_num > win_residue) {
1396                         dev_dbg(map->dev, "Writing window %d/%zu\n",
1397                                 win_residue, val_len / map->format.val_bytes);
1398                         ret = _regmap_raw_write(map, reg, val, win_residue *
1399                                                 map->format.val_bytes);
1400                         if (ret != 0)
1401                                 return ret;
1402
1403                         reg += win_residue;
1404                         val_num -= win_residue;
1405                         val += win_residue * map->format.val_bytes;
1406                         val_len -= win_residue * map->format.val_bytes;
1407
1408                         win_offset = (reg - range->range_min) %
1409                                 range->window_len;
1410                         win_residue = range->window_len - win_offset;
1411                 }
1412
1413                 ret = _regmap_select_page(map, &reg, range, val_num);
1414                 if (ret != 0)
1415                         return ret;
1416         }
1417
1418         map->format.format_reg(map->work_buf, reg, map->reg_shift);
1419         regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
1420                                       map->write_flag_mask);
1421
1422         /*
1423          * Essentially all I/O mechanisms will be faster with a single
1424          * buffer to write.  Since register syncs often generate raw
1425          * writes of single registers optimise that case.
1426          */
1427         if (val != work_val && val_len == map->format.val_bytes) {
1428                 memcpy(work_val, val, map->format.val_bytes);
1429                 val = work_val;
1430         }
1431
1432         if (map->async && map->bus->async_write) {
1433                 struct regmap_async *async;
1434
1435                 trace_regmap_async_write_start(map, reg, val_len);
1436
1437                 spin_lock_irqsave(&map->async_lock, flags);
1438                 async = list_first_entry_or_null(&map->async_free,
1439                                                  struct regmap_async,
1440                                                  list);
1441                 if (async)
1442                         list_del(&async->list);
1443                 spin_unlock_irqrestore(&map->async_lock, flags);
1444
1445                 if (!async) {
1446                         async = map->bus->async_alloc();
1447                         if (!async)
1448                                 return -ENOMEM;
1449
1450                         async->work_buf = kzalloc(map->format.buf_size,
1451                                                   GFP_KERNEL | GFP_DMA);
1452                         if (!async->work_buf) {
1453                                 kfree(async);
1454                                 return -ENOMEM;
1455                         }
1456                 }
1457
1458                 async->map = map;
1459
1460                 /* If the caller supplied the value we can use it safely. */
1461                 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1462                        map->format.reg_bytes + map->format.val_bytes);
1463
1464                 spin_lock_irqsave(&map->async_lock, flags);
1465                 list_add_tail(&async->list, &map->async_list);
1466                 spin_unlock_irqrestore(&map->async_lock, flags);
1467
1468                 if (val != work_val)
1469                         ret = map->bus->async_write(map->bus_context,
1470                                                     async->work_buf,
1471                                                     map->format.reg_bytes +
1472                                                     map->format.pad_bytes,
1473                                                     val, val_len, async);
1474                 else
1475                         ret = map->bus->async_write(map->bus_context,
1476                                                     async->work_buf,
1477                                                     map->format.reg_bytes +
1478                                                     map->format.pad_bytes +
1479                                                     val_len, NULL, 0, async);
1480
1481                 if (ret != 0) {
1482                         dev_err(map->dev, "Failed to schedule write: %d\n",
1483                                 ret);
1484
1485                         spin_lock_irqsave(&map->async_lock, flags);
1486                         list_move(&async->list, &map->async_free);
1487                         spin_unlock_irqrestore(&map->async_lock, flags);
1488                 }
1489
1490                 return ret;
1491         }
1492
1493         trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1494
1495         /* If we're doing a single register write we can probably just
1496          * send the work_buf directly, otherwise try to do a gather
1497          * write.
1498          */
1499         if (val == work_val)
1500                 ret = map->bus->write(map->bus_context, map->work_buf,
1501                                       map->format.reg_bytes +
1502                                       map->format.pad_bytes +
1503                                       val_len);
1504         else if (map->bus->gather_write)
1505                 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1506                                              map->format.reg_bytes +
1507                                              map->format.pad_bytes,
1508                                              val, val_len);
1509
1510         /* If that didn't work fall back on linearising by hand. */
1511         if (ret == -ENOTSUPP) {
1512                 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1513                 buf = kzalloc(len, GFP_KERNEL);
1514                 if (!buf)
1515                         return -ENOMEM;
1516
1517                 memcpy(buf, map->work_buf, map->format.reg_bytes);
1518                 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1519                        val, val_len);
1520                 ret = map->bus->write(map->bus_context, buf, len);
1521
1522                 kfree(buf);
1523         } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
1524                 /* regcache_drop_region() takes lock that we already have,
1525                  * thus call map->cache_ops->drop() directly
1526                  */
1527                 if (map->cache_ops && map->cache_ops->drop)
1528                         map->cache_ops->drop(map, reg, reg + 1);
1529         }
1530
1531         trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1532
1533         return ret;
1534 }
1535
1536 /**
1537  * regmap_can_raw_write - Test if regmap_raw_write() is supported
1538  *
1539  * @map: Map to check.
1540  */
1541 bool regmap_can_raw_write(struct regmap *map)
1542 {
1543         return map->bus && map->bus->write && map->format.format_val &&
1544                 map->format.format_reg;
1545 }
1546 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1547
1548 /**
1549  * regmap_get_raw_read_max - Get the maximum size we can read
1550  *
1551  * @map: Map to check.
1552  */
1553 size_t regmap_get_raw_read_max(struct regmap *map)
1554 {
1555         return map->max_raw_read;
1556 }
1557 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
1558
1559 /**
1560  * regmap_get_raw_write_max - Get the maximum size we can read
1561  *
1562  * @map: Map to check.
1563  */
1564 size_t regmap_get_raw_write_max(struct regmap *map)
1565 {
1566         return map->max_raw_write;
1567 }
1568 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
1569
1570 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1571                                        unsigned int val)
1572 {
1573         int ret;
1574         struct regmap_range_node *range;
1575         struct regmap *map = context;
1576
1577         WARN_ON(!map->bus || !map->format.format_write);
1578
1579         range = _regmap_range_lookup(map, reg);
1580         if (range) {
1581                 ret = _regmap_select_page(map, &reg, range, 1);
1582                 if (ret != 0)
1583                         return ret;
1584         }
1585
1586         map->format.format_write(map, reg, val);
1587
1588         trace_regmap_hw_write_start(map, reg, 1);
1589
1590         ret = map->bus->write(map->bus_context, map->work_buf,
1591                               map->format.buf_size);
1592
1593         trace_regmap_hw_write_done(map, reg, 1);
1594
1595         return ret;
1596 }
1597
1598 static int _regmap_bus_reg_write(void *context, unsigned int reg,
1599                                  unsigned int val)
1600 {
1601         struct regmap *map = context;
1602
1603         return map->bus->reg_write(map->bus_context, reg, val);
1604 }
1605
1606 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1607                                  unsigned int val)
1608 {
1609         struct regmap *map = context;
1610
1611         WARN_ON(!map->bus || !map->format.format_val);
1612
1613         map->format.format_val(map->work_buf + map->format.reg_bytes
1614                                + map->format.pad_bytes, val, 0);
1615         return _regmap_raw_write(map, reg,
1616                                  map->work_buf +
1617                                  map->format.reg_bytes +
1618                                  map->format.pad_bytes,
1619                                  map->format.val_bytes);
1620 }
1621
1622 static inline void *_regmap_map_get_context(struct regmap *map)
1623 {
1624         return (map->bus) ? map : map->bus_context;
1625 }
1626
1627 int _regmap_write(struct regmap *map, unsigned int reg,
1628                   unsigned int val)
1629 {
1630         int ret;
1631         void *context = _regmap_map_get_context(map);
1632
1633         if (!regmap_writeable(map, reg))
1634                 return -EIO;
1635
1636         if (!map->cache_bypass && !map->defer_caching) {
1637                 ret = regcache_write(map, reg, val);
1638                 if (ret != 0)
1639                         return ret;
1640                 if (map->cache_only) {
1641                         map->cache_dirty = true;
1642                         return 0;
1643                 }
1644         }
1645
1646 #ifdef LOG_DEVICE
1647         if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1648                 dev_info(map->dev, "%x <= %x\n", reg, val);
1649 #endif
1650
1651         trace_regmap_reg_write(map, reg, val);
1652
1653         return map->reg_write(context, reg, val);
1654 }
1655
1656 /**
1657  * regmap_write(): Write a value to a single register
1658  *
1659  * @map: Register map to write to
1660  * @reg: Register to write to
1661  * @val: Value to be written
1662  *
1663  * A value of zero will be returned on success, a negative errno will
1664  * be returned in error cases.
1665  */
1666 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1667 {
1668         int ret;
1669
1670         if (!IS_ALIGNED(reg, map->reg_stride))
1671                 return -EINVAL;
1672
1673         map->lock(map->lock_arg);
1674
1675         ret = _regmap_write(map, reg, val);
1676
1677         map->unlock(map->lock_arg);
1678
1679         return ret;
1680 }
1681 EXPORT_SYMBOL_GPL(regmap_write);
1682
1683 /**
1684  * regmap_write_async(): Write a value to a single register asynchronously
1685  *
1686  * @map: Register map to write to
1687  * @reg: Register to write to
1688  * @val: Value to be written
1689  *
1690  * A value of zero will be returned on success, a negative errno will
1691  * be returned in error cases.
1692  */
1693 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1694 {
1695         int ret;
1696
1697         if (!IS_ALIGNED(reg, map->reg_stride))
1698                 return -EINVAL;
1699
1700         map->lock(map->lock_arg);
1701
1702         map->async = true;
1703
1704         ret = _regmap_write(map, reg, val);
1705
1706         map->async = false;
1707
1708         map->unlock(map->lock_arg);
1709
1710         return ret;
1711 }
1712 EXPORT_SYMBOL_GPL(regmap_write_async);
1713
1714 /**
1715  * regmap_raw_write(): Write raw values to one or more registers
1716  *
1717  * @map: Register map to write to
1718  * @reg: Initial register to write to
1719  * @val: Block of data to be written, laid out for direct transmission to the
1720  *       device
1721  * @val_len: Length of data pointed to by val.
1722  *
1723  * This function is intended to be used for things like firmware
1724  * download where a large block of data needs to be transferred to the
1725  * device.  No formatting will be done on the data provided.
1726  *
1727  * A value of zero will be returned on success, a negative errno will
1728  * be returned in error cases.
1729  */
1730 int regmap_raw_write(struct regmap *map, unsigned int reg,
1731                      const void *val, size_t val_len)
1732 {
1733         int ret;
1734
1735         if (!regmap_can_raw_write(map))
1736                 return -EINVAL;
1737         if (val_len % map->format.val_bytes)
1738                 return -EINVAL;
1739         if (map->max_raw_write && map->max_raw_write > val_len)
1740                 return -E2BIG;
1741
1742         map->lock(map->lock_arg);
1743
1744         ret = _regmap_raw_write(map, reg, val, val_len);
1745
1746         map->unlock(map->lock_arg);
1747
1748         return ret;
1749 }
1750 EXPORT_SYMBOL_GPL(regmap_raw_write);
1751
1752 /**
1753  * regmap_field_update_bits_base():
1754  *      Perform a read/modify/write cycle on the register field
1755  *      with change, async, force option
1756  *
1757  * @field: Register field to write to
1758  * @mask: Bitmask to change
1759  * @val: Value to be written
1760  * @change: Boolean indicating if a write was done
1761  * @async: Boolean indicating asynchronously
1762  * @force: Boolean indicating use force update
1763  *
1764  * A value of zero will be returned on success, a negative errno will
1765  * be returned in error cases.
1766  */
1767 int regmap_field_update_bits_base(struct regmap_field *field,
1768                                   unsigned int mask, unsigned int val,
1769                                   bool *change, bool async, bool force)
1770 {
1771         mask = (mask << field->shift) & field->mask;
1772
1773         return regmap_update_bits_base(field->regmap, field->reg,
1774                                        mask, val << field->shift,
1775                                        change, async, force);
1776 }
1777 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
1778
1779 /**
1780  * regmap_fields_update_bits_base():
1781  *      Perform a read/modify/write cycle on the register field
1782  *      with change, async, force option
1783  *
1784  * @field: Register field to write to
1785  * @id: port ID
1786  * @mask: Bitmask to change
1787  * @val: Value to be written
1788  * @change: Boolean indicating if a write was done
1789  * @async: Boolean indicating asynchronously
1790  * @force: Boolean indicating use force update
1791  *
1792  * A value of zero will be returned on success, a negative errno will
1793  * be returned in error cases.
1794  */
1795 int regmap_fields_update_bits_base(struct regmap_field *field,  unsigned int id,
1796                                    unsigned int mask, unsigned int val,
1797                                    bool *change, bool async, bool force)
1798 {
1799         if (id >= field->id_size)
1800                 return -EINVAL;
1801
1802         mask = (mask << field->shift) & field->mask;
1803
1804         return regmap_update_bits_base(field->regmap,
1805                                        field->reg + (field->id_offset * id),
1806                                        mask, val << field->shift,
1807                                        change, async, force);
1808 }
1809 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
1810
1811 /*
1812  * regmap_bulk_write(): Write multiple registers to the device
1813  *
1814  * @map: Register map to write to
1815  * @reg: First register to be write from
1816  * @val: Block of data to be written, in native register size for device
1817  * @val_count: Number of registers to write
1818  *
1819  * This function is intended to be used for writing a large block of
1820  * data to the device either in single transfer or multiple transfer.
1821  *
1822  * A value of zero will be returned on success, a negative errno will
1823  * be returned in error cases.
1824  */
1825 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1826                      size_t val_count)
1827 {
1828         int ret = 0, i;
1829         size_t val_bytes = map->format.val_bytes;
1830         size_t total_size = val_bytes * val_count;
1831
1832         if (!IS_ALIGNED(reg, map->reg_stride))
1833                 return -EINVAL;
1834
1835         /*
1836          * Some devices don't support bulk write, for
1837          * them we have a series of single write operations in the first two if
1838          * blocks.
1839          *
1840          * The first if block is used for memory mapped io. It does not allow
1841          * val_bytes of 3 for example.
1842          * The second one is for busses that do not provide raw I/O.
1843          * The third one is used for busses which do not have these limitations
1844          * and can write arbitrary value lengths.
1845          */
1846         if (!map->bus) {
1847                 map->lock(map->lock_arg);
1848                 for (i = 0; i < val_count; i++) {
1849                         unsigned int ival;
1850
1851                         switch (val_bytes) {
1852                         case 1:
1853                                 ival = *(u8 *)(val + (i * val_bytes));
1854                                 break;
1855                         case 2:
1856                                 ival = *(u16 *)(val + (i * val_bytes));
1857                                 break;
1858                         case 4:
1859                                 ival = *(u32 *)(val + (i * val_bytes));
1860                                 break;
1861 #ifdef CONFIG_64BIT
1862                         case 8:
1863                                 ival = *(u64 *)(val + (i * val_bytes));
1864                                 break;
1865 #endif
1866                         default:
1867                                 ret = -EINVAL;
1868                                 goto out;
1869                         }
1870
1871                         ret = _regmap_write(map,
1872                                             reg + regmap_get_offset(map, i),
1873                                             ival);
1874                         if (ret != 0)
1875                                 goto out;
1876                 }
1877 out:
1878                 map->unlock(map->lock_arg);
1879         } else if (map->bus && !map->format.parse_inplace) {
1880                 const u8 *u8 = val;
1881                 const u16 *u16 = val;
1882                 const u32 *u32 = val;
1883                 unsigned int ival;
1884
1885                 for (i = 0; i < val_count; i++) {
1886                         switch (map->format.val_bytes) {
1887                         case 4:
1888                                 ival = u32[i];
1889                                 break;
1890                         case 2:
1891                                 ival = u16[i];
1892                                 break;
1893                         case 1:
1894                                 ival = u8[i];
1895                                 break;
1896                         default:
1897                                 return -EINVAL;
1898                         }
1899
1900                         ret = regmap_write(map, reg + (i * map->reg_stride),
1901                                            ival);
1902                         if (ret)
1903                                 return ret;
1904                 }
1905         } else if (map->use_single_write ||
1906                    (map->max_raw_write && map->max_raw_write < total_size)) {
1907                 int chunk_stride = map->reg_stride;
1908                 size_t chunk_size = val_bytes;
1909                 size_t chunk_count = val_count;
1910
1911                 if (!map->use_single_write) {
1912                         chunk_size = map->max_raw_write;
1913                         if (chunk_size % val_bytes)
1914                                 chunk_size -= chunk_size % val_bytes;
1915                         chunk_count = total_size / chunk_size;
1916                         chunk_stride *= chunk_size / val_bytes;
1917                 }
1918
1919                 map->lock(map->lock_arg);
1920                 /* Write as many bytes as possible with chunk_size */
1921                 for (i = 0; i < chunk_count; i++) {
1922                         ret = _regmap_raw_write(map,
1923                                                 reg + (i * chunk_stride),
1924                                                 val + (i * chunk_size),
1925                                                 chunk_size);
1926                         if (ret)
1927                                 break;
1928                 }
1929
1930                 /* Write remaining bytes */
1931                 if (!ret && chunk_size * i < total_size) {
1932                         ret = _regmap_raw_write(map, reg + (i * chunk_stride),
1933                                                 val + (i * chunk_size),
1934                                                 total_size - i * chunk_size);
1935                 }
1936                 map->unlock(map->lock_arg);
1937         } else {
1938                 void *wval;
1939
1940                 if (!val_count)
1941                         return -EINVAL;
1942
1943                 wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
1944                 if (!wval) {
1945                         dev_err(map->dev, "Error in memory allocation\n");
1946                         return -ENOMEM;
1947                 }
1948                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1949                         map->format.parse_inplace(wval + i);
1950
1951                 map->lock(map->lock_arg);
1952                 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1953                 map->unlock(map->lock_arg);
1954
1955                 kfree(wval);
1956         }
1957         return ret;
1958 }
1959 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1960
1961 /*
1962  * _regmap_raw_multi_reg_write()
1963  *
1964  * the (register,newvalue) pairs in regs have not been formatted, but
1965  * they are all in the same page and have been changed to being page
1966  * relative. The page register has been written if that was necessary.
1967  */
1968 static int _regmap_raw_multi_reg_write(struct regmap *map,
1969                                        const struct reg_sequence *regs,
1970                                        size_t num_regs)
1971 {
1972         int ret;
1973         void *buf;
1974         int i;
1975         u8 *u8;
1976         size_t val_bytes = map->format.val_bytes;
1977         size_t reg_bytes = map->format.reg_bytes;
1978         size_t pad_bytes = map->format.pad_bytes;
1979         size_t pair_size = reg_bytes + pad_bytes + val_bytes;
1980         size_t len = pair_size * num_regs;
1981
1982         if (!len)
1983                 return -EINVAL;
1984
1985         buf = kzalloc(len, GFP_KERNEL);
1986         if (!buf)
1987                 return -ENOMEM;
1988
1989         /* We have to linearise by hand. */
1990
1991         u8 = buf;
1992
1993         for (i = 0; i < num_regs; i++) {
1994                 unsigned int reg = regs[i].reg;
1995                 unsigned int val = regs[i].def;
1996                 trace_regmap_hw_write_start(map, reg, 1);
1997                 map->format.format_reg(u8, reg, map->reg_shift);
1998                 u8 += reg_bytes + pad_bytes;
1999                 map->format.format_val(u8, val, 0);
2000                 u8 += val_bytes;
2001         }
2002         u8 = buf;
2003         *u8 |= map->write_flag_mask;
2004
2005         ret = map->bus->write(map->bus_context, buf, len);
2006
2007         kfree(buf);
2008
2009         for (i = 0; i < num_regs; i++) {
2010                 int reg = regs[i].reg;
2011                 trace_regmap_hw_write_done(map, reg, 1);
2012         }
2013         return ret;
2014 }
2015
2016 static unsigned int _regmap_register_page(struct regmap *map,
2017                                           unsigned int reg,
2018                                           struct regmap_range_node *range)
2019 {
2020         unsigned int win_page = (reg - range->range_min) / range->window_len;
2021
2022         return win_page;
2023 }
2024
2025 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
2026                                                struct reg_sequence *regs,
2027                                                size_t num_regs)
2028 {
2029         int ret;
2030         int i, n;
2031         struct reg_sequence *base;
2032         unsigned int this_page = 0;
2033         unsigned int page_change = 0;
2034         /*
2035          * the set of registers are not neccessarily in order, but
2036          * since the order of write must be preserved this algorithm
2037          * chops the set each time the page changes. This also applies
2038          * if there is a delay required at any point in the sequence.
2039          */
2040         base = regs;
2041         for (i = 0, n = 0; i < num_regs; i++, n++) {
2042                 unsigned int reg = regs[i].reg;
2043                 struct regmap_range_node *range;
2044
2045                 range = _regmap_range_lookup(map, reg);
2046                 if (range) {
2047                         unsigned int win_page = _regmap_register_page(map, reg,
2048                                                                       range);
2049
2050                         if (i == 0)
2051                                 this_page = win_page;
2052                         if (win_page != this_page) {
2053                                 this_page = win_page;
2054                                 page_change = 1;
2055                         }
2056                 }
2057
2058                 /* If we have both a page change and a delay make sure to
2059                  * write the regs and apply the delay before we change the
2060                  * page.
2061                  */
2062
2063                 if (page_change || regs[i].delay_us) {
2064
2065                                 /* For situations where the first write requires
2066                                  * a delay we need to make sure we don't call
2067                                  * raw_multi_reg_write with n=0
2068                                  * This can't occur with page breaks as we
2069                                  * never write on the first iteration
2070                                  */
2071                                 if (regs[i].delay_us && i == 0)
2072                                         n = 1;
2073
2074                                 ret = _regmap_raw_multi_reg_write(map, base, n);
2075                                 if (ret != 0)
2076                                         return ret;
2077
2078                                 if (regs[i].delay_us)
2079                                         udelay(regs[i].delay_us);
2080
2081                                 base += n;
2082                                 n = 0;
2083
2084                                 if (page_change) {
2085                                         ret = _regmap_select_page(map,
2086                                                                   &base[n].reg,
2087                                                                   range, 1);
2088                                         if (ret != 0)
2089                                                 return ret;
2090
2091                                         page_change = 0;
2092                                 }
2093
2094                 }
2095
2096         }
2097         if (n > 0)
2098                 return _regmap_raw_multi_reg_write(map, base, n);
2099         return 0;
2100 }
2101
2102 static int _regmap_multi_reg_write(struct regmap *map,
2103                                    const struct reg_sequence *regs,
2104                                    size_t num_regs)
2105 {
2106         int i;
2107         int ret;
2108
2109         if (!map->can_multi_write) {
2110                 for (i = 0; i < num_regs; i++) {
2111                         ret = _regmap_write(map, regs[i].reg, regs[i].def);
2112                         if (ret != 0)
2113                                 return ret;
2114
2115                         if (regs[i].delay_us)
2116                                 udelay(regs[i].delay_us);
2117                 }
2118                 return 0;
2119         }
2120
2121         if (!map->format.parse_inplace)
2122                 return -EINVAL;
2123
2124         if (map->writeable_reg)
2125                 for (i = 0; i < num_regs; i++) {
2126                         int reg = regs[i].reg;
2127                         if (!map->writeable_reg(map->dev, reg))
2128                                 return -EINVAL;
2129                         if (!IS_ALIGNED(reg, map->reg_stride))
2130                                 return -EINVAL;
2131                 }
2132
2133         if (!map->cache_bypass) {
2134                 for (i = 0; i < num_regs; i++) {
2135                         unsigned int val = regs[i].def;
2136                         unsigned int reg = regs[i].reg;
2137                         ret = regcache_write(map, reg, val);
2138                         if (ret) {
2139                                 dev_err(map->dev,
2140                                 "Error in caching of register: %x ret: %d\n",
2141                                                                 reg, ret);
2142                                 return ret;
2143                         }
2144                 }
2145                 if (map->cache_only) {
2146                         map->cache_dirty = true;
2147                         return 0;
2148                 }
2149         }
2150
2151         WARN_ON(!map->bus);
2152
2153         for (i = 0; i < num_regs; i++) {
2154                 unsigned int reg = regs[i].reg;
2155                 struct regmap_range_node *range;
2156
2157                 /* Coalesce all the writes between a page break or a delay
2158                  * in a sequence
2159                  */
2160                 range = _regmap_range_lookup(map, reg);
2161                 if (range || regs[i].delay_us) {
2162                         size_t len = sizeof(struct reg_sequence)*num_regs;
2163                         struct reg_sequence *base = kmemdup(regs, len,
2164                                                            GFP_KERNEL);
2165                         if (!base)
2166                                 return -ENOMEM;
2167                         ret = _regmap_range_multi_paged_reg_write(map, base,
2168                                                                   num_regs);
2169                         kfree(base);
2170
2171                         return ret;
2172                 }
2173         }
2174         return _regmap_raw_multi_reg_write(map, regs, num_regs);
2175 }
2176
2177 /*
2178  * regmap_multi_reg_write(): Write multiple registers to the device
2179  *
2180  * where the set of register,value pairs are supplied in any order,
2181  * possibly not all in a single range.
2182  *
2183  * @map: Register map to write to
2184  * @regs: Array of structures containing register,value to be written
2185  * @num_regs: Number of registers to write
2186  *
2187  * The 'normal' block write mode will send ultimately send data on the
2188  * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
2189  * addressed. However, this alternative block multi write mode will send
2190  * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2191  * must of course support the mode.
2192  *
2193  * A value of zero will be returned on success, a negative errno will be
2194  * returned in error cases.
2195  */
2196 int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
2197                            int num_regs)
2198 {
2199         int ret;
2200
2201         map->lock(map->lock_arg);
2202
2203         ret = _regmap_multi_reg_write(map, regs, num_regs);
2204
2205         map->unlock(map->lock_arg);
2206
2207         return ret;
2208 }
2209 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
2210
2211 /*
2212  * regmap_multi_reg_write_bypassed(): Write multiple registers to the
2213  *                                    device but not the cache
2214  *
2215  * where the set of register are supplied in any order
2216  *
2217  * @map: Register map to write to
2218  * @regs: Array of structures containing register,value to be written
2219  * @num_regs: Number of registers to write
2220  *
2221  * This function is intended to be used for writing a large block of data
2222  * atomically to the device in single transfer for those I2C client devices
2223  * that implement this alternative block write mode.
2224  *
2225  * A value of zero will be returned on success, a negative errno will
2226  * be returned in error cases.
2227  */
2228 int regmap_multi_reg_write_bypassed(struct regmap *map,
2229                                     const struct reg_sequence *regs,
2230                                     int num_regs)
2231 {
2232         int ret;
2233         bool bypass;
2234
2235         map->lock(map->lock_arg);
2236
2237         bypass = map->cache_bypass;
2238         map->cache_bypass = true;
2239
2240         ret = _regmap_multi_reg_write(map, regs, num_regs);
2241
2242         map->cache_bypass = bypass;
2243
2244         map->unlock(map->lock_arg);
2245
2246         return ret;
2247 }
2248 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
2249
2250 /**
2251  * regmap_raw_write_async(): Write raw values to one or more registers
2252  *                           asynchronously
2253  *
2254  * @map: Register map to write to
2255  * @reg: Initial register to write to
2256  * @val: Block of data to be written, laid out for direct transmission to the
2257  *       device.  Must be valid until regmap_async_complete() is called.
2258  * @val_len: Length of data pointed to by val.
2259  *
2260  * This function is intended to be used for things like firmware
2261  * download where a large block of data needs to be transferred to the
2262  * device.  No formatting will be done on the data provided.
2263  *
2264  * If supported by the underlying bus the write will be scheduled
2265  * asynchronously, helping maximise I/O speed on higher speed buses
2266  * like SPI.  regmap_async_complete() can be called to ensure that all
2267  * asynchrnous writes have been completed.
2268  *
2269  * A value of zero will be returned on success, a negative errno will
2270  * be returned in error cases.
2271  */
2272 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2273                            const void *val, size_t val_len)
2274 {
2275         int ret;
2276
2277         if (val_len % map->format.val_bytes)
2278                 return -EINVAL;
2279         if (!IS_ALIGNED(reg, map->reg_stride))
2280                 return -EINVAL;
2281
2282         map->lock(map->lock_arg);
2283
2284         map->async = true;
2285
2286         ret = _regmap_raw_write(map, reg, val, val_len);
2287
2288         map->async = false;
2289
2290         map->unlock(map->lock_arg);
2291
2292         return ret;
2293 }
2294 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2295
2296 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2297                             unsigned int val_len)
2298 {
2299         struct regmap_range_node *range;
2300         int ret;
2301
2302         WARN_ON(!map->bus);
2303
2304         if (!map->bus || !map->bus->read)
2305                 return -EINVAL;
2306
2307         range = _regmap_range_lookup(map, reg);
2308         if (range) {
2309                 ret = _regmap_select_page(map, &reg, range,
2310                                           val_len / map->format.val_bytes);
2311                 if (ret != 0)
2312                         return ret;
2313         }
2314
2315         map->format.format_reg(map->work_buf, reg, map->reg_shift);
2316         regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
2317                                       map->read_flag_mask);
2318         trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2319
2320         ret = map->bus->read(map->bus_context, map->work_buf,
2321                              map->format.reg_bytes + map->format.pad_bytes,
2322                              val, val_len);
2323
2324         trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2325
2326         return ret;
2327 }
2328
2329 static int _regmap_bus_reg_read(void *context, unsigned int reg,
2330                                 unsigned int *val)
2331 {
2332         struct regmap *map = context;
2333
2334         return map->bus->reg_read(map->bus_context, reg, val);
2335 }
2336
2337 static int _regmap_bus_read(void *context, unsigned int reg,
2338                             unsigned int *val)
2339 {
2340         int ret;
2341         struct regmap *map = context;
2342
2343         if (!map->format.parse_val)
2344                 return -EINVAL;
2345
2346         ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
2347         if (ret == 0)
2348                 *val = map->format.parse_val(map->work_buf);
2349
2350         return ret;
2351 }
2352
2353 static int _regmap_read(struct regmap *map, unsigned int reg,
2354                         unsigned int *val)
2355 {
2356         int ret;
2357         void *context = _regmap_map_get_context(map);
2358
2359         if (!map->cache_bypass) {
2360                 ret = regcache_read(map, reg, val);
2361                 if (ret == 0)
2362                         return 0;
2363         }
2364
2365         if (map->cache_only)
2366                 return -EBUSY;
2367
2368         if (!regmap_readable(map, reg))
2369                 return -EIO;
2370
2371         ret = map->reg_read(context, reg, val);
2372         if (ret == 0) {
2373 #ifdef LOG_DEVICE
2374                 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2375                         dev_info(map->dev, "%x => %x\n", reg, *val);
2376 #endif
2377
2378                 trace_regmap_reg_read(map, reg, *val);
2379
2380                 if (!map->cache_bypass)
2381                         regcache_write(map, reg, *val);
2382         }
2383
2384         return ret;
2385 }
2386
2387 /**
2388  * regmap_read(): Read a value from a single register
2389  *
2390  * @map: Register map to read from
2391  * @reg: Register to be read from
2392  * @val: Pointer to store read value
2393  *
2394  * A value of zero will be returned on success, a negative errno will
2395  * be returned in error cases.
2396  */
2397 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2398 {
2399         int ret;
2400
2401         if (!IS_ALIGNED(reg, map->reg_stride))
2402                 return -EINVAL;
2403
2404         map->lock(map->lock_arg);
2405
2406         ret = _regmap_read(map, reg, val);
2407
2408         map->unlock(map->lock_arg);
2409
2410         return ret;
2411 }
2412 EXPORT_SYMBOL_GPL(regmap_read);
2413
2414 /**
2415  * regmap_raw_read(): Read raw data from the device
2416  *
2417  * @map: Register map to read from
2418  * @reg: First register to be read from
2419  * @val: Pointer to store read value
2420  * @val_len: Size of data to read
2421  *
2422  * A value of zero will be returned on success, a negative errno will
2423  * be returned in error cases.
2424  */
2425 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2426                     size_t val_len)
2427 {
2428         size_t val_bytes = map->format.val_bytes;
2429         size_t val_count = val_len / val_bytes;
2430         unsigned int v;
2431         int ret, i;
2432
2433         if (!map->bus)
2434                 return -EINVAL;
2435         if (val_len % map->format.val_bytes)
2436                 return -EINVAL;
2437         if (!IS_ALIGNED(reg, map->reg_stride))
2438                 return -EINVAL;
2439         if (val_count == 0)
2440                 return -EINVAL;
2441
2442         map->lock(map->lock_arg);
2443
2444         if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2445             map->cache_type == REGCACHE_NONE) {
2446                 if (!map->bus->read) {
2447                         ret = -ENOTSUPP;
2448                         goto out;
2449                 }
2450                 if (map->max_raw_read && map->max_raw_read < val_len) {
2451                         ret = -E2BIG;
2452                         goto out;
2453                 }
2454
2455                 /* Physical block read if there's no cache involved */
2456                 ret = _regmap_raw_read(map, reg, val, val_len);
2457
2458         } else {
2459                 /* Otherwise go word by word for the cache; should be low
2460                  * cost as we expect to hit the cache.
2461                  */
2462                 for (i = 0; i < val_count; i++) {
2463                         ret = _regmap_read(map, reg + regmap_get_offset(map, i),
2464                                            &v);
2465                         if (ret != 0)
2466                                 goto out;
2467
2468                         map->format.format_val(val + (i * val_bytes), v, 0);
2469                 }
2470         }
2471
2472  out:
2473         map->unlock(map->lock_arg);
2474
2475         return ret;
2476 }
2477 EXPORT_SYMBOL_GPL(regmap_raw_read);
2478
2479 /**
2480  * regmap_field_read(): Read a value to a single register field
2481  *
2482  * @field: Register field to read from
2483  * @val: Pointer to store read value
2484  *
2485  * A value of zero will be returned on success, a negative errno will
2486  * be returned in error cases.
2487  */
2488 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2489 {
2490         int ret;
2491         unsigned int reg_val;
2492         ret = regmap_read(field->regmap, field->reg, &reg_val);
2493         if (ret != 0)
2494                 return ret;
2495
2496         reg_val &= field->mask;
2497         reg_val >>= field->shift;
2498         *val = reg_val;
2499
2500         return ret;
2501 }
2502 EXPORT_SYMBOL_GPL(regmap_field_read);
2503
2504 /**
2505  * regmap_fields_read(): Read a value to a single register field with port ID
2506  *
2507  * @field: Register field to read from
2508  * @id: port ID
2509  * @val: Pointer to store read value
2510  *
2511  * A value of zero will be returned on success, a negative errno will
2512  * be returned in error cases.
2513  */
2514 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2515                        unsigned int *val)
2516 {
2517         int ret;
2518         unsigned int reg_val;
2519
2520         if (id >= field->id_size)
2521                 return -EINVAL;
2522
2523         ret = regmap_read(field->regmap,
2524                           field->reg + (field->id_offset * id),
2525                           &reg_val);
2526         if (ret != 0)
2527                 return ret;
2528
2529         reg_val &= field->mask;
2530         reg_val >>= field->shift;
2531         *val = reg_val;
2532
2533         return ret;
2534 }
2535 EXPORT_SYMBOL_GPL(regmap_fields_read);
2536
2537 /**
2538  * regmap_bulk_read(): Read multiple registers from the device
2539  *
2540  * @map: Register map to read from
2541  * @reg: First register to be read from
2542  * @val: Pointer to store read value, in native register size for device
2543  * @val_count: Number of registers to read
2544  *
2545  * A value of zero will be returned on success, a negative errno will
2546  * be returned in error cases.
2547  */
2548 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2549                      size_t val_count)
2550 {
2551         int ret, i;
2552         size_t val_bytes = map->format.val_bytes;
2553         bool vol = regmap_volatile_range(map, reg, val_count);
2554
2555         if (!IS_ALIGNED(reg, map->reg_stride))
2556                 return -EINVAL;
2557
2558         if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2559                 /*
2560                  * Some devices does not support bulk read, for
2561                  * them we have a series of single read operations.
2562                  */
2563                 size_t total_size = val_bytes * val_count;
2564
2565                 if (!map->use_single_read &&
2566                     (!map->max_raw_read || map->max_raw_read > total_size)) {
2567                         ret = regmap_raw_read(map, reg, val,
2568                                               val_bytes * val_count);
2569                         if (ret != 0)
2570                                 return ret;
2571                 } else {
2572                         /*
2573                          * Some devices do not support bulk read or do not
2574                          * support large bulk reads, for them we have a series
2575                          * of read operations.
2576                          */
2577                         int chunk_stride = map->reg_stride;
2578                         size_t chunk_size = val_bytes;
2579                         size_t chunk_count = val_count;
2580
2581                         if (!map->use_single_read) {
2582                                 chunk_size = map->max_raw_read;
2583                                 if (chunk_size % val_bytes)
2584                                         chunk_size -= chunk_size % val_bytes;
2585                                 chunk_count = total_size / chunk_size;
2586                                 chunk_stride *= chunk_size / val_bytes;
2587                         }
2588
2589                         /* Read bytes that fit into a multiple of chunk_size */
2590                         for (i = 0; i < chunk_count; i++) {
2591                                 ret = regmap_raw_read(map,
2592                                                       reg + (i * chunk_stride),
2593                                                       val + (i * chunk_size),
2594                                                       chunk_size);
2595                                 if (ret != 0)
2596                                         return ret;
2597                         }
2598
2599                         /* Read remaining bytes */
2600                         if (chunk_size * i < total_size) {
2601                                 ret = regmap_raw_read(map,
2602                                                       reg + (i * chunk_stride),
2603                                                       val + (i * chunk_size),
2604                                                       total_size - i * chunk_size);
2605                                 if (ret != 0)
2606                                         return ret;
2607                         }
2608                 }
2609
2610                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2611                         map->format.parse_inplace(val + i);
2612         } else {
2613                 for (i = 0; i < val_count; i++) {
2614                         unsigned int ival;
2615                         ret = regmap_read(map, reg + regmap_get_offset(map, i),
2616                                           &ival);
2617                         if (ret != 0)
2618                                 return ret;
2619
2620                         if (map->format.format_val) {
2621                                 map->format.format_val(val + (i * val_bytes), ival, 0);
2622                         } else {
2623                                 /* Devices providing read and write
2624                                  * operations can use the bulk I/O
2625                                  * functions if they define a val_bytes,
2626                                  * we assume that the values are native
2627                                  * endian.
2628                                  */
2629 #ifdef CONFIG_64BIT
2630                                 u64 *u64 = val;
2631 #endif
2632                                 u32 *u32 = val;
2633                                 u16 *u16 = val;
2634                                 u8 *u8 = val;
2635
2636                                 switch (map->format.val_bytes) {
2637 #ifdef CONFIG_64BIT
2638                                 case 8:
2639                                         u64[i] = ival;
2640                                         break;
2641 #endif
2642                                 case 4:
2643                                         u32[i] = ival;
2644                                         break;
2645                                 case 2:
2646                                         u16[i] = ival;
2647                                         break;
2648                                 case 1:
2649                                         u8[i] = ival;
2650                                         break;
2651                                 default:
2652                                         return -EINVAL;
2653                                 }
2654                         }
2655                 }
2656         }
2657
2658         return 0;
2659 }
2660 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2661
2662 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2663                                unsigned int mask, unsigned int val,
2664                                bool *change, bool force_write)
2665 {
2666         int ret;
2667         unsigned int tmp, orig;
2668
2669         if (change)
2670                 *change = false;
2671
2672         if (regmap_volatile(map, reg) && map->reg_update_bits) {
2673                 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
2674                 if (ret == 0 && change)
2675                         *change = true;
2676         } else {
2677                 ret = _regmap_read(map, reg, &orig);
2678                 if (ret != 0)
2679                         return ret;
2680
2681                 tmp = orig & ~mask;
2682                 tmp |= val & mask;
2683
2684                 if (force_write || (tmp != orig)) {
2685                         ret = _regmap_write(map, reg, tmp);
2686                         if (ret == 0 && change)
2687                                 *change = true;
2688                 }
2689         }
2690
2691         return ret;
2692 }
2693
2694 /**
2695  * regmap_update_bits_base:
2696  *      Perform a read/modify/write cycle on the
2697  *      register map with change, async, force option
2698  *
2699  * @map: Register map to update
2700  * @reg: Register to update
2701  * @mask: Bitmask to change
2702  * @val: New value for bitmask
2703  * @change: Boolean indicating if a write was done
2704  * @async: Boolean indicating asynchronously
2705  * @force: Boolean indicating use force update
2706  *
2707  * if async was true,
2708  * With most buses the read must be done synchronously so this is most
2709  * useful for devices with a cache which do not need to interact with
2710  * the hardware to determine the current register value.
2711  *
2712  * Returns zero for success, a negative number on error.
2713  */
2714 int regmap_update_bits_base(struct regmap *map, unsigned int reg,
2715                             unsigned int mask, unsigned int val,
2716                             bool *change, bool async, bool force)
2717 {
2718         int ret;
2719
2720         map->lock(map->lock_arg);
2721
2722         map->async = async;
2723
2724         ret = _regmap_update_bits(map, reg, mask, val, change, force);
2725
2726         map->async = false;
2727
2728         map->unlock(map->lock_arg);
2729
2730         return ret;
2731 }
2732 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
2733
2734 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2735 {
2736         struct regmap *map = async->map;
2737         bool wake;
2738
2739         trace_regmap_async_io_complete(map);
2740
2741         spin_lock(&map->async_lock);
2742         list_move(&async->list, &map->async_free);
2743         wake = list_empty(&map->async_list);
2744
2745         if (ret != 0)
2746                 map->async_ret = ret;
2747
2748         spin_unlock(&map->async_lock);
2749
2750         if (wake)
2751                 wake_up(&map->async_waitq);
2752 }
2753 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2754
2755 static int regmap_async_is_done(struct regmap *map)
2756 {
2757         unsigned long flags;
2758         int ret;
2759
2760         spin_lock_irqsave(&map->async_lock, flags);
2761         ret = list_empty(&map->async_list);
2762         spin_unlock_irqrestore(&map->async_lock, flags);
2763
2764         return ret;
2765 }
2766
2767 /**
2768  * regmap_async_complete: Ensure all asynchronous I/O has completed.
2769  *
2770  * @map: Map to operate on.
2771  *
2772  * Blocks until any pending asynchronous I/O has completed.  Returns
2773  * an error code for any failed I/O operations.
2774  */
2775 int regmap_async_complete(struct regmap *map)
2776 {
2777         unsigned long flags;
2778         int ret;
2779
2780         /* Nothing to do with no async support */
2781         if (!map->bus || !map->bus->async_write)
2782                 return 0;
2783
2784         trace_regmap_async_complete_start(map);
2785
2786         wait_event(map->async_waitq, regmap_async_is_done(map));
2787
2788         spin_lock_irqsave(&map->async_lock, flags);
2789         ret = map->async_ret;
2790         map->async_ret = 0;
2791         spin_unlock_irqrestore(&map->async_lock, flags);
2792
2793         trace_regmap_async_complete_done(map);
2794
2795         return ret;
2796 }
2797 EXPORT_SYMBOL_GPL(regmap_async_complete);
2798
2799 /**
2800  * regmap_register_patch: Register and apply register updates to be applied
2801  *                        on device initialistion
2802  *
2803  * @map: Register map to apply updates to.
2804  * @regs: Values to update.
2805  * @num_regs: Number of entries in regs.
2806  *
2807  * Register a set of register updates to be applied to the device
2808  * whenever the device registers are synchronised with the cache and
2809  * apply them immediately.  Typically this is used to apply
2810  * corrections to be applied to the device defaults on startup, such
2811  * as the updates some vendors provide to undocumented registers.
2812  *
2813  * The caller must ensure that this function cannot be called
2814  * concurrently with either itself or regcache_sync().
2815  */
2816 int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
2817                           int num_regs)
2818 {
2819         struct reg_sequence *p;
2820         int ret;
2821         bool bypass;
2822
2823         if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2824             num_regs))
2825                 return 0;
2826
2827         p = krealloc(map->patch,
2828                      sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
2829                      GFP_KERNEL);
2830         if (p) {
2831                 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2832                 map->patch = p;
2833                 map->patch_regs += num_regs;
2834         } else {
2835                 return -ENOMEM;
2836         }
2837
2838         map->lock(map->lock_arg);
2839
2840         bypass = map->cache_bypass;
2841
2842         map->cache_bypass = true;
2843         map->async = true;
2844
2845         ret = _regmap_multi_reg_write(map, regs, num_regs);
2846
2847         map->async = false;
2848         map->cache_bypass = bypass;
2849
2850         map->unlock(map->lock_arg);
2851
2852         regmap_async_complete(map);
2853
2854         return ret;
2855 }
2856 EXPORT_SYMBOL_GPL(regmap_register_patch);
2857
2858 /*
2859  * regmap_get_val_bytes(): Report the size of a register value
2860  *
2861  * Report the size of a register value, mainly intended to for use by
2862  * generic infrastructure built on top of regmap.
2863  */
2864 int regmap_get_val_bytes(struct regmap *map)
2865 {
2866         if (map->format.format_write)
2867                 return -EINVAL;
2868
2869         return map->format.val_bytes;
2870 }
2871 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2872
2873 /**
2874  * regmap_get_max_register(): Report the max register value
2875  *
2876  * Report the max register value, mainly intended to for use by
2877  * generic infrastructure built on top of regmap.
2878  */
2879 int regmap_get_max_register(struct regmap *map)
2880 {
2881         return map->max_register ? map->max_register : -EINVAL;
2882 }
2883 EXPORT_SYMBOL_GPL(regmap_get_max_register);
2884
2885 /**
2886  * regmap_get_reg_stride(): Report the register address stride
2887  *
2888  * Report the register address stride, mainly intended to for use by
2889  * generic infrastructure built on top of regmap.
2890  */
2891 int regmap_get_reg_stride(struct regmap *map)
2892 {
2893         return map->reg_stride;
2894 }
2895 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
2896
2897 int regmap_parse_val(struct regmap *map, const void *buf,
2898                         unsigned int *val)
2899 {
2900         if (!map->format.parse_val)
2901                 return -EINVAL;
2902
2903         *val = map->format.parse_val(buf);
2904
2905         return 0;
2906 }
2907 EXPORT_SYMBOL_GPL(regmap_parse_val);
2908
2909 static int __init regmap_initcall(void)
2910 {
2911         regmap_debugfs_initcall();
2912
2913         return 0;
2914 }
2915 postcore_initcall(regmap_initcall);