drivers/base/regmap/regmap.c

   1 /*
   2  * Register map access API
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/slab.h>
  15 #include <linux/export.h>
  16 #include <linux/mutex.h>
  17 #include <linux/err.h>
  18 #include <linux/of.h>
  19 #include <linux/rbtree.h>
  20 #include <linux/sched.h>
  21 #include <linux/delay.h>
  22
  23 #define CREATE_TRACE_POINTS
  24 #include "trace.h"
  25
  26 #include "internal.h"
  27
  28 /*
  29  * Sometimes for failures during very early init the trace
  30  * infrastructure isn't available early enough to be used.  For this
  31  * sort of problem defining LOG_DEVICE will add printks for basic
  32  * register I/O on a specific device.
  33  */
  34 #undef LOG_DEVICE
  35
  36 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
  37                                unsigned int mask, unsigned int val,
  38                                bool *change, bool force_write);
  39
  40 static int _regmap_bus_reg_read(void *context, unsigned int reg,
  41                                 unsigned int *val);
  42 static int _regmap_bus_read(void *context, unsigned int reg,
  43                             unsigned int *val);
  44 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
  45                                        unsigned int val);
  46 static int _regmap_bus_reg_write(void *context, unsigned int reg,
  47                                  unsigned int val);
  48 static int _regmap_bus_raw_write(void *context, unsigned int reg,
  49                                  unsigned int val);
  50
  51 bool regmap_reg_in_ranges(unsigned int reg,
  52                           const struct regmap_range *ranges,
  53                           unsigned int nranges)
  54 {
  55         const struct regmap_range *r;
  56         int i;
  57
  58         for (i = 0, r = ranges; i < nranges; i++, r++)
  59                 if (regmap_reg_in_range(reg, r))
  60                         return true;
  61         return false;
  62 }
  63 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
  64
  65 bool regmap_check_range_table(struct regmap *map, unsigned int reg,
  66                               const struct regmap_access_table *table)
  67 {
  68         /* Check "no ranges" first */
  69         if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
  70                 return false;
  71
  72         /* In case zero "yes ranges" are supplied, any reg is OK */
  73         if (!table->n_yes_ranges)
  74                 return true;
  75
  76         return regmap_reg_in_ranges(reg, table->yes_ranges,
  77                                     table->n_yes_ranges);
  78 }
  79 EXPORT_SYMBOL_GPL(regmap_check_range_table);
  80
  81 bool regmap_writeable(struct regmap *map, unsigned int reg)
  82 {
  83         if (map->max_register && reg > map->max_register)
  84                 return false;
  85
  86         if (map->writeable_reg)
  87                 return map->writeable_reg(map->dev, reg);
  88
  89         if (map->wr_table)
  90                 return regmap_check_range_table(map, reg, map->wr_table);
  91
  92         return true;
  93 }
  94
  95 bool regmap_readable(struct regmap *map, unsigned int reg)
  96 {
  97         if (!map->reg_read)
  98                 return false;
  99
 100         if (map->max_register && reg > map->max_register)
 101                 return false;
 102
 103         if (map->format.format_write)
 104                 return false;
 105
 106         if (map->readable_reg)
 107                 return map->readable_reg(map->dev, reg);
 108
 109         if (map->rd_table)
 110                 return regmap_check_range_table(map, reg, map->rd_table);
 111
 112         return true;
 113 }
 114
 115 bool regmap_volatile(struct regmap *map, unsigned int reg)
 116 {
 117         if (!map->format.format_write && !regmap_readable(map, reg))
 118                 return false;
 119
 120         if (map->volatile_reg)
 121                 return map->volatile_reg(map->dev, reg);
 122
 123         if (map->volatile_table)
 124                 return regmap_check_range_table(map, reg, map->volatile_table);
 125
 126         if (map->cache_ops)
 127                 return false;
 128         else
 129                 return true;
 130 }
 131
 132 bool regmap_precious(struct regmap *map, unsigned int reg)
 133 {
 134         if (!regmap_readable(map, reg))
 135                 return false;
 136
 137         if (map->precious_reg)
 138                 return map->precious_reg(map->dev, reg);
 139
 140         if (map->precious_table)
 141                 return regmap_check_range_table(map, reg, map->precious_table);
 142
 143         return false;
 144 }
 145
 146 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
 147         size_t num)
 148 {
 149         unsigned int i;
 150
 151         for (i = 0; i < num; i++)
 152                 if (!regmap_volatile(map, reg + i))
 153                         return false;
 154
 155         return true;
 156 }
 157
 158 static void regmap_format_2_6_write(struct regmap *map,
 159                                      unsigned int reg, unsigned int val)
 160 {
 161         u8 *out = map->work_buf;
 162
 163         *out = (reg << 6) | val;
 164 }
 165
 166 static void regmap_format_4_12_write(struct regmap *map,
 167                                      unsigned int reg, unsigned int val)
 168 {
 169         __be16 *out = map->work_buf;
 170         *out = cpu_to_be16((reg << 12) | val);
 171 }
 172
 173 static void regmap_format_7_9_write(struct regmap *map,
 174                                     unsigned int reg, unsigned int val)
 175 {
 176         __be16 *out = map->work_buf;
 177         *out = cpu_to_be16((reg << 9) | val);
 178 }
 179
 180 static void regmap_format_10_14_write(struct regmap *map,
 181                                     unsigned int reg, unsigned int val)
 182 {
 183         u8 *out = map->work_buf;
 184
 185         out[2] = val;
 186         out[1] = (val >> 8) | (reg << 6);
 187         out[0] = reg >> 2;
 188 }
 189
 190 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 191 {
 192         u8 *b = buf;
 193
 194         b[0] = val << shift;
 195 }
 196
 197 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
 198 {
 199         __be16 *b = buf;
 200
 201         b[0] = cpu_to_be16(val << shift);
 202 }
 203
 204 static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
 205 {
 206         __le16 *b = buf;
 207
 208         b[0] = cpu_to_le16(val << shift);
 209 }
 210
 211 static void regmap_format_16_native(void *buf, unsigned int val,
 212                                     unsigned int shift)
 213 {
 214         *(u16 *)buf = val << shift;
 215 }
 216
 217 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 218 {
 219         u8 *b = buf;
 220
 221         val <<= shift;
 222
 223         b[0] = val >> 16;
 224         b[1] = val >> 8;
 225         b[2] = val;
 226 }
 227
 228 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
 229 {
 230         __be32 *b = buf;
 231
 232         b[0] = cpu_to_be32(val << shift);
 233 }
 234
 235 static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
 236 {
 237         __le32 *b = buf;
 238
 239         b[0] = cpu_to_le32(val << shift);
 240 }
 241
 242 static void regmap_format_32_native(void *buf, unsigned int val,
 243                                     unsigned int shift)
 244 {
 245         *(u32 *)buf = val << shift;
 246 }
 247
 248 #ifdef CONFIG_64BIT
 249 static void regmap_format_64_be(void *buf, unsigned int val, unsigned int shift)
 250 {
 251         __be64 *b = buf;
 252
 253         b[0] = cpu_to_be64((u64)val << shift);
 254 }
 255
 256 static void regmap_format_64_le(void *buf, unsigned int val, unsigned int shift)
 257 {
 258         __le64 *b = buf;
 259
 260         b[0] = cpu_to_le64((u64)val << shift);
 261 }
 262
 263 static void regmap_format_64_native(void *buf, unsigned int val,
 264                                     unsigned int shift)
 265 {
 266         *(u64 *)buf = (u64)val << shift;
 267 }
 268 #endif
 269
 270 static void regmap_parse_inplace_noop(void *buf)
 271 {
 272 }
 273
 274 static unsigned int regmap_parse_8(const void *buf)
 275 {
 276         const u8 *b = buf;
 277
 278         return b[0];
 279 }
 280
 281 static unsigned int regmap_parse_16_be(const void *buf)
 282 {
 283         const __be16 *b = buf;
 284
 285         return be16_to_cpu(b[0]);
 286 }
 287
 288 static unsigned int regmap_parse_16_le(const void *buf)
 289 {
 290         const __le16 *b = buf;
 291
 292         return le16_to_cpu(b[0]);
 293 }
 294
 295 static void regmap_parse_16_be_inplace(void *buf)
 296 {
 297         __be16 *b = buf;
 298
 299         b[0] = be16_to_cpu(b[0]);
 300 }
 301
 302 static void regmap_parse_16_le_inplace(void *buf)
 303 {
 304         __le16 *b = buf;
 305
 306         b[0] = le16_to_cpu(b[0]);
 307 }
 308
 309 static unsigned int regmap_parse_16_native(const void *buf)
 310 {
 311         return *(u16 *)buf;
 312 }
 313
 314 static unsigned int regmap_parse_24(const void *buf)
 315 {
 316         const u8 *b = buf;
 317         unsigned int ret = b[2];
 318         ret |= ((unsigned int)b[1]) << 8;
 319         ret |= ((unsigned int)b[0]) << 16;
 320
 321         return ret;
 322 }
 323
 324 static unsigned int regmap_parse_32_be(const void *buf)
 325 {
 326         const __be32 *b = buf;
 327
 328         return be32_to_cpu(b[0]);
 329 }
 330
 331 static unsigned int regmap_parse_32_le(const void *buf)
 332 {
 333         const __le32 *b = buf;
 334
 335         return le32_to_cpu(b[0]);
 336 }
 337
 338 static void regmap_parse_32_be_inplace(void *buf)
 339 {
 340         __be32 *b = buf;
 341
 342         b[0] = be32_to_cpu(b[0]);
 343 }
 344
 345 static void regmap_parse_32_le_inplace(void *buf)
 346 {
 347         __le32 *b = buf;
 348
 349         b[0] = le32_to_cpu(b[0]);
 350 }
 351
 352 static unsigned int regmap_parse_32_native(const void *buf)
 353 {
 354         return *(u32 *)buf;
 355 }
 356
 357 #ifdef CONFIG_64BIT
 358 static unsigned int regmap_parse_64_be(const void *buf)
 359 {
 360         const __be64 *b = buf;
 361
 362         return be64_to_cpu(b[0]);
 363 }
 364
 365 static unsigned int regmap_parse_64_le(const void *buf)
 366 {
 367         const __le64 *b = buf;
 368
 369         return le64_to_cpu(b[0]);
 370 }
 371
 372 static void regmap_parse_64_be_inplace(void *buf)
 373 {
 374         __be64 *b = buf;
 375
 376         b[0] = be64_to_cpu(b[0]);
 377 }
 378
 379 static void regmap_parse_64_le_inplace(void *buf)
 380 {
 381         __le64 *b = buf;
 382
 383         b[0] = le64_to_cpu(b[0]);
 384 }
 385
 386 static unsigned int regmap_parse_64_native(const void *buf)
 387 {
 388         return *(u64 *)buf;
 389 }
 390 #endif
 391
 392 static void regmap_lock_mutex(void *__map)
 393 {
 394         struct regmap *map = __map;
 395         mutex_lock(&map->mutex);
 396 }
 397
 398 static void regmap_unlock_mutex(void *__map)
 399 {
 400         struct regmap *map = __map;
 401         mutex_unlock(&map->mutex);
 402 }
 403
 404 static void regmap_lock_spinlock(void *__map)
 405 __acquires(&map->spinlock)
 406 {
 407         struct regmap *map = __map;
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&map->spinlock, flags);
 411         map->spinlock_flags = flags;
 412 }
 413
 414 static void regmap_unlock_spinlock(void *__map)
 415 __releases(&map->spinlock)
 416 {
 417         struct regmap *map = __map;
 418         spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
 419 }
 420
 421 static void dev_get_regmap_release(struct device *dev, void *res)
 422 {
 423         /*
 424          * We don't actually have anything to do here; the goal here
 425          * is not to manage the regmap but to provide a simple way to
 426          * get the regmap back given a struct device.
 427          */
 428 }
 429
 430 static bool _regmap_range_add(struct regmap *map,
 431                               struct regmap_range_node *data)
 432 {
 433         struct rb_root *root = &map->range_tree;
 434         struct rb_node **new = &(root->rb_node), *parent = NULL;
 435
 436         while (*new) {
 437                 struct regmap_range_node *this =
 438                         container_of(*new, struct regmap_range_node, node);
 439
 440                 parent = *new;
 441                 if (data->range_max < this->range_min)
 442                         new = &((*new)->rb_left);
 443                 else if (data->range_min > this->range_max)
 444                         new = &((*new)->rb_right);
 445                 else
 446                         return false;
 447         }
 448
 449         rb_link_node(&data->node, parent, new);
 450         rb_insert_color(&data->node, root);
 451
 452         return true;
 453 }
 454
 455 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
 456                                                       unsigned int reg)
 457 {
 458         struct rb_node *node = map->range_tree.rb_node;
 459
 460         while (node) {
 461                 struct regmap_range_node *this =
 462                         container_of(node, struct regmap_range_node, node);
 463
 464                 if (reg < this->range_min)
 465                         node = node->rb_left;
 466                 else if (reg > this->range_max)
 467                         node = node->rb_right;
 468                 else
 469                         return this;
 470         }
 471
 472         return NULL;
 473 }
 474
 475 static void regmap_range_exit(struct regmap *map)
 476 {
 477         struct rb_node *next;
 478         struct regmap_range_node *range_node;
 479
 480         next = rb_first(&map->range_tree);
 481         while (next) {
 482                 range_node = rb_entry(next, struct regmap_range_node, node);
 483                 next = rb_next(&range_node->node);
 484                 rb_erase(&range_node->node, &map->range_tree);
 485                 kfree(range_node);
 486         }
 487
 488         kfree(map->selector_work_buf);
 489 }
 490
 491 int regmap_attach_dev(struct device *dev, struct regmap *map,
 492                       const struct regmap_config *config)
 493 {
 494         struct regmap **m;
 495
 496         map->dev = dev;
 497
 498         regmap_debugfs_init(map, config->name);
 499
 500         /* Add a devres resource for dev_get_regmap() */
 501         m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
 502         if (!m) {
 503                 regmap_debugfs_exit(map);
 504                 return -ENOMEM;
 505         }
 506         *m = map;
 507         devres_add(dev, m);
 508
 509         return 0;
 510 }
 511 EXPORT_SYMBOL_GPL(regmap_attach_dev);
 512
 513 static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
 514                                         const struct regmap_config *config)
 515 {
 516         enum regmap_endian endian;
 517
 518         /* Retrieve the endianness specification from the regmap config */
 519         endian = config->reg_format_endian;
 520
 521         /* If the regmap config specified a non-default value, use that */
 522         if (endian != REGMAP_ENDIAN_DEFAULT)
 523                 return endian;
 524
 525         /* Retrieve the endianness specification from the bus config */
 526         if (bus && bus->reg_format_endian_default)
 527                 endian = bus->reg_format_endian_default;
 528
 529         /* If the bus specified a non-default value, use that */
 530         if (endian != REGMAP_ENDIAN_DEFAULT)
 531                 return endian;
 532
 533         /* Use this if no other value was found */
 534         return REGMAP_ENDIAN_BIG;
 535 }
 536
 537 enum regmap_endian regmap_get_val_endian(struct device *dev,
 538                                          const struct regmap_bus *bus,
 539                                          const struct regmap_config *config)
 540 {
 541         struct device_node *np;
 542         enum regmap_endian endian;
 543
 544         /* Retrieve the endianness specification from the regmap config */
 545         endian = config->val_format_endian;
 546
 547         /* If the regmap config specified a non-default value, use that */
 548         if (endian != REGMAP_ENDIAN_DEFAULT)
 549                 return endian;
 550
 551         /* If the dev and dev->of_node exist try to get endianness from DT */
 552         if (dev && dev->of_node) {
 553                 np = dev->of_node;
 554
 555                 /* Parse the device's DT node for an endianness specification */
 556                 if (of_property_read_bool(np, "big-endian"))
 557                         endian = REGMAP_ENDIAN_BIG;
 558                 else if (of_property_read_bool(np, "little-endian"))
 559                         endian = REGMAP_ENDIAN_LITTLE;
 560
 561                 /* If the endianness was specified in DT, use that */
 562                 if (endian != REGMAP_ENDIAN_DEFAULT)
 563                         return endian;
 564         }
 565
 566         /* Retrieve the endianness specification from the bus config */
 567         if (bus && bus->val_format_endian_default)
 568                 endian = bus->val_format_endian_default;
 569
 570         /* If the bus specified a non-default value, use that */
 571         if (endian != REGMAP_ENDIAN_DEFAULT)
 572                 return endian;
 573
 574         /* Use this if no other value was found */
 575         return REGMAP_ENDIAN_BIG;
 576 }
 577 EXPORT_SYMBOL_GPL(regmap_get_val_endian);
 578
 579 struct regmap *__regmap_init(struct device *dev,
 580                              const struct regmap_bus *bus,
 581                              void *bus_context,
 582                              const struct regmap_config *config,
 583                              struct lock_class_key *lock_key,
 584                              const char *lock_name)
 585 {
 586         struct regmap *map;
 587         int ret = -EINVAL;
 588         enum regmap_endian reg_endian, val_endian;
 589         int i, j;
 590
 591         if (!config)
 592                 goto err;
 593
 594         map = kzalloc(sizeof(*map), GFP_KERNEL);
 595         if (map == NULL) {
 596                 ret = -ENOMEM;
 597                 goto err;
 598         }
 599
 600         if (config->lock && config->unlock) {
 601                 map->lock = config->lock;
 602                 map->unlock = config->unlock;
 603                 map->lock_arg = config->lock_arg;
 604         } else {
 605                 if ((bus && bus->fast_io) ||
 606                     config->fast_io) {
 607                         spin_lock_init(&map->spinlock);
 608                         map->lock = regmap_lock_spinlock;
 609                         map->unlock = regmap_unlock_spinlock;
 610                         lockdep_set_class_and_name(&map->spinlock,
 611                                                    lock_key, lock_name);
 612                 } else {
 613                         mutex_init(&map->mutex);
 614                         map->lock = regmap_lock_mutex;
 615                         map->unlock = regmap_unlock_mutex;
 616                         lockdep_set_class_and_name(&map->mutex,
 617                                                    lock_key, lock_name);
 618                 }
 619                 map->lock_arg = map;
 620         }
 621
 622         /*
 623          * When we write in fast-paths with regmap_bulk_write() don't allocate
 624          * scratch buffers with sleeping allocations.
 625          */
 626         if ((bus && bus->fast_io) || config->fast_io)
 627                 map->alloc_flags = GFP_ATOMIC;
 628         else
 629                 map->alloc_flags = GFP_KERNEL;
 630
 631         map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 632         map->format.pad_bytes = config->pad_bits / 8;
 633         map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 634         map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
 635                         config->val_bits + config->pad_bits, 8);
 636         map->reg_shift = config->pad_bits % 8;
 637         if (config->reg_stride)
 638                 map->reg_stride = config->reg_stride;
 639         else
 640                 map->reg_stride = 1;
 641         map->use_single_read = config->use_single_rw || !bus || !bus->read;
 642         map->use_single_write = config->use_single_rw || !bus || !bus->write;
 643         map->can_multi_write = config->can_multi_write && bus && bus->write;
 644         if (bus) {
 645                 map->max_raw_read = bus->max_raw_read;
 646                 map->max_raw_write = bus->max_raw_write;
 647         }
 648         map->dev = dev;
 649         map->bus = bus;
 650         map->bus_context = bus_context;
 651         map->max_register = config->max_register;
 652         map->wr_table = config->wr_table;
 653         map->rd_table = config->rd_table;
 654         map->volatile_table = config->volatile_table;
 655         map->precious_table = config->precious_table;
 656         map->writeable_reg = config->writeable_reg;
 657         map->readable_reg = config->readable_reg;
 658         map->volatile_reg = config->volatile_reg;
 659         map->precious_reg = config->precious_reg;
 660         map->cache_type = config->cache_type;
 661         map->name = config->name;
 662
 663         spin_lock_init(&map->async_lock);
 664         INIT_LIST_HEAD(&map->async_list);
 665         INIT_LIST_HEAD(&map->async_free);
 666         init_waitqueue_head(&map->async_waitq);
 667
 668         if (config->read_flag_mask || config->write_flag_mask) {
 669                 map->read_flag_mask = config->read_flag_mask;
 670                 map->write_flag_mask = config->write_flag_mask;
 671         } else if (bus) {
 672                 map->read_flag_mask = bus->read_flag_mask;
 673         }
 674
 675         if (!bus) {
 676                 map->reg_read  = config->reg_read;
 677                 map->reg_write = config->reg_write;
 678
 679                 map->defer_caching = false;
 680                 goto skip_format_initialization;
 681         } else if (!bus->read || !bus->write) {
 682                 map->reg_read = _regmap_bus_reg_read;
 683                 map->reg_write = _regmap_bus_reg_write;
 684
 685                 map->defer_caching = false;
 686                 goto skip_format_initialization;
 687         } else {
 688                 map->reg_read  = _regmap_bus_read;
 689                 map->reg_update_bits = bus->reg_update_bits;
 690         }
 691
 692         reg_endian = regmap_get_reg_endian(bus, config);
 693         val_endian = regmap_get_val_endian(dev, bus, config);
 694
 695         switch (config->reg_bits + map->reg_shift) {
 696         case 2:
 697                 switch (config->val_bits) {
 698                 case 6:
 699                         map->format.format_write = regmap_format_2_6_write;
 700                         break;
 701                 default:
 702                         goto err_map;
 703                 }
 704                 break;
 705
 706         case 4:
 707                 switch (config->val_bits) {
 708                 case 12:
 709                         map->format.format_write = regmap_format_4_12_write;
 710                         break;
 711                 default:
 712                         goto err_map;
 713                 }
 714                 break;
 715
 716         case 7:
 717                 switch (config->val_bits) {
 718                 case 9:
 719                         map->format.format_write = regmap_format_7_9_write;
 720                         break;
 721                 default:
 722                         goto err_map;
 723                 }
 724                 break;
 725
 726         case 10:
 727                 switch (config->val_bits) {
 728                 case 14:
 729                         map->format.format_write = regmap_format_10_14_write;
 730                         break;
 731                 default:
 732                         goto err_map;
 733                 }
 734                 break;
 735
 736         case 8:
 737                 map->format.format_reg = regmap_format_8;
 738                 break;
 739
 740         case 16:
 741                 switch (reg_endian) {
 742                 case REGMAP_ENDIAN_BIG:
 743                         map->format.format_reg = regmap_format_16_be;
 744                         break;
 745                 case REGMAP_ENDIAN_NATIVE:
 746                         map->format.format_reg = regmap_format_16_native;
 747                         break;
 748                 default:
 749                         goto err_map;
 750                 }
 751                 break;
 752
 753         case 24:
 754                 if (reg_endian != REGMAP_ENDIAN_BIG)
 755                         goto err_map;
 756                 map->format.format_reg = regmap_format_24;
 757                 break;
 758
 759         case 32:
 760                 switch (reg_endian) {
 761                 case REGMAP_ENDIAN_BIG:
 762                         map->format.format_reg = regmap_format_32_be;
 763                         break;
 764                 case REGMAP_ENDIAN_NATIVE:
 765                         map->format.format_reg = regmap_format_32_native;
 766                         break;
 767                 default:
 768                         goto err_map;
 769                 }
 770                 break;
 771
 772 #ifdef CONFIG_64BIT
 773         case 64:
 774                 switch (reg_endian) {
 775                 case REGMAP_ENDIAN_BIG:
 776                         map->format.format_reg = regmap_format_64_be;
 777                         break;
 778                 case REGMAP_ENDIAN_NATIVE:
 779                         map->format.format_reg = regmap_format_64_native;
 780                         break;
 781                 default:
 782                         goto err_map;
 783                 }
 784                 break;
 785 #endif
 786
 787         default:
 788                 goto err_map;
 789         }
 790
 791         if (val_endian == REGMAP_ENDIAN_NATIVE)
 792                 map->format.parse_inplace = regmap_parse_inplace_noop;
 793
 794         switch (config->val_bits) {
 795         case 8:
 796                 map->format.format_val = regmap_format_8;
 797                 map->format.parse_val = regmap_parse_8;
 798                 map->format.parse_inplace = regmap_parse_inplace_noop;
 799                 break;
 800         case 16:
 801                 switch (val_endian) {
 802                 case REGMAP_ENDIAN_BIG:
 803                         map->format.format_val = regmap_format_16_be;
 804                         map->format.parse_val = regmap_parse_16_be;
 805                         map->format.parse_inplace = regmap_parse_16_be_inplace;
 806                         break;
 807                 case REGMAP_ENDIAN_LITTLE:
 808                         map->format.format_val = regmap_format_16_le;
 809                         map->format.parse_val = regmap_parse_16_le;
 810                         map->format.parse_inplace = regmap_parse_16_le_inplace;
 811                         break;
 812                 case REGMAP_ENDIAN_NATIVE:
 813                         map->format.format_val = regmap_format_16_native;
 814                         map->format.parse_val = regmap_parse_16_native;
 815                         break;
 816                 default:
 817                         goto err_map;
 818                 }
 819                 break;
 820         case 24:
 821                 if (val_endian != REGMAP_ENDIAN_BIG)
 822                         goto err_map;
 823                 map->format.format_val = regmap_format_24;
 824                 map->format.parse_val = regmap_parse_24;
 825                 break;
 826         case 32:
 827                 switch (val_endian) {
 828                 case REGMAP_ENDIAN_BIG:
 829                         map->format.format_val = regmap_format_32_be;
 830                         map->format.parse_val = regmap_parse_32_be;
 831                         map->format.parse_inplace = regmap_parse_32_be_inplace;
 832                         break;
 833                 case REGMAP_ENDIAN_LITTLE:
 834                         map->format.format_val = regmap_format_32_le;
 835                         map->format.parse_val = regmap_parse_32_le;
 836                         map->format.parse_inplace = regmap_parse_32_le_inplace;
 837                         break;
 838                 case REGMAP_ENDIAN_NATIVE:
 839                         map->format.format_val = regmap_format_32_native;
 840                         map->format.parse_val = regmap_parse_32_native;
 841                         break;
 842                 default:
 843                         goto err_map;
 844                 }
 845                 break;
 846 #ifdef CONFIG_64BIT
 847         case 64:
 848                 switch (val_endian) {
 849                 case REGMAP_ENDIAN_BIG:
 850                         map->format.format_val = regmap_format_64_be;
 851                         map->format.parse_val = regmap_parse_64_be;
 852                         map->format.parse_inplace = regmap_parse_64_be_inplace;
 853                         break;
 854                 case REGMAP_ENDIAN_LITTLE:
 855                         map->format.format_val = regmap_format_64_le;
 856                         map->format.parse_val = regmap_parse_64_le;
 857                         map->format.parse_inplace = regmap_parse_64_le_inplace;
 858                         break;
 859                 case REGMAP_ENDIAN_NATIVE:
 860                         map->format.format_val = regmap_format_64_native;
 861                         map->format.parse_val = regmap_parse_64_native;
 862                         break;
 863                 default:
 864                         goto err_map;
 865                 }
 866                 break;
 867 #endif
 868         }
 869
 870         if (map->format.format_write) {
 871                 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
 872                     (val_endian != REGMAP_ENDIAN_BIG))
 873                         goto err_map;
 874                 map->use_single_write = true;
 875         }
 876
 877         if (!map->format.format_write &&
 878             !(map->format.format_reg && map->format.format_val))
 879                 goto err_map;
 880
 881         map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
 882         if (map->work_buf == NULL) {
 883                 ret = -ENOMEM;
 884                 goto err_map;
 885         }
 886
 887         if (map->format.format_write) {
 888                 map->defer_caching = false;
 889                 map->reg_write = _regmap_bus_formatted_write;
 890         } else if (map->format.format_val) {
 891                 map->defer_caching = true;
 892                 map->reg_write = _regmap_bus_raw_write;
 893         }
 894
 895 skip_format_initialization:
 896
 897         map->range_tree = RB_ROOT;
 898         for (i = 0; i < config->num_ranges; i++) {
 899                 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
 900                 struct regmap_range_node *new;
 901
 902                 /* Sanity check */
 903                 if (range_cfg->range_max < range_cfg->range_min) {
 904                         dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
 905                                 range_cfg->range_max, range_cfg->range_min);
 906                         goto err_range;
 907                 }
 908
 909                 if (range_cfg->range_max > map->max_register) {
 910                         dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
 911                                 range_cfg->range_max, map->max_register);
 912                         goto err_range;
 913                 }
 914
 915                 if (range_cfg->selector_reg > map->max_register) {
 916                         dev_err(map->dev,
 917                                 "Invalid range %d: selector out of map\n", i);
 918                         goto err_range;
 919                 }
 920
 921                 if (range_cfg->window_len == 0) {
 922                         dev_err(map->dev, "Invalid range %d: window_len 0\n",
 923                                 i);
 924                         goto err_range;
 925                 }
 926
 927                 /* Make sure, that this register range has no selector
 928                    or data window within its boundary */
 929                 for (j = 0; j < config->num_ranges; j++) {
 930                         unsigned sel_reg = config->ranges[j].selector_reg;
 931                         unsigned win_min = config->ranges[j].window_start;
 932                         unsigned win_max = win_min +
 933                                            config->ranges[j].window_len - 1;
 934
 935                         /* Allow data window inside its own virtual range */
 936                         if (j == i)
 937                                 continue;
 938
 939                         if (range_cfg->range_min <= sel_reg &&
 940                             sel_reg <= range_cfg->range_max) {
 941                                 dev_err(map->dev,
 942                                         "Range %d: selector for %d in window\n",
 943                                         i, j);
 944                                 goto err_range;
 945                         }
 946
 947                         if (!(win_max < range_cfg->range_min ||
 948                               win_min > range_cfg->range_max)) {
 949                                 dev_err(map->dev,
 950                                         "Range %d: window for %d in window\n",
 951                                         i, j);
 952                                 goto err_range;
 953                         }
 954                 }
 955
 956                 new = kzalloc(sizeof(*new), GFP_KERNEL);
 957                 if (new == NULL) {
 958                         ret = -ENOMEM;
 959                         goto err_range;
 960                 }
 961
 962                 new->map = map;
 963                 new->name = range_cfg->name;
 964                 new->range_min = range_cfg->range_min;
 965                 new->range_max = range_cfg->range_max;
 966                 new->selector_reg = range_cfg->selector_reg;
 967                 new->selector_mask = range_cfg->selector_mask;
 968                 new->selector_shift = range_cfg->selector_shift;
 969                 new->window_start = range_cfg->window_start;
 970                 new->window_len = range_cfg->window_len;
 971
 972                 if (!_regmap_range_add(map, new)) {
 973                         dev_err(map->dev, "Failed to add range %d\n", i);
 974                         kfree(new);
 975                         goto err_range;
 976                 }
 977
 978                 if (map->selector_work_buf == NULL) {
 979                         map->selector_work_buf =
 980                                 kzalloc(map->format.buf_size, GFP_KERNEL);
 981                         if (map->selector_work_buf == NULL) {
 982                                 ret = -ENOMEM;
 983                                 goto err_range;
 984                         }
 985                 }
 986         }
 987
 988         ret = regcache_init(map, config);
 989         if (ret != 0)
 990                 goto err_range;
 991
 992         if (dev) {
 993                 ret = regmap_attach_dev(dev, map, config);
 994                 if (ret != 0)
 995                         goto err_regcache;
 996         }
 997
 998         return map;
 999
1000 err_regcache:
1001         regcache_exit(map);
1002 err_range:
1003         regmap_range_exit(map);
1004         kfree(map->work_buf);
1005 err_map:
1006         kfree(map);
1007 err:
1008         return ERR_PTR(ret);
1009 }
1010 EXPORT_SYMBOL_GPL(__regmap_init);
1011
1012 static void devm_regmap_release(struct device *dev, void *res)
1013 {
1014         regmap_exit(*(struct regmap **)res);
1015 }
1016
1017 struct regmap *__devm_regmap_init(struct device *dev,
1018                                   const struct regmap_bus *bus,
1019                                   void *bus_context,
1020                                   const struct regmap_config *config,
1021                                   struct lock_class_key *lock_key,
1022                                   const char *lock_name)
1023 {
1024         struct regmap **ptr, *regmap;
1025
1026         ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
1027         if (!ptr)
1028                 return ERR_PTR(-ENOMEM);
1029
1030         regmap = __regmap_init(dev, bus, bus_context, config,
1031                                lock_key, lock_name);
1032         if (!IS_ERR(regmap)) {
1033                 *ptr = regmap;
1034                 devres_add(dev, ptr);
1035         } else {
1036                 devres_free(ptr);
1037         }
1038
1039         return regmap;
1040 }
1041 EXPORT_SYMBOL_GPL(__devm_regmap_init);
1042
1043 static void regmap_field_init(struct regmap_field *rm_field,
1044         struct regmap *regmap, struct reg_field reg_field)
1045 {
1046         rm_field->regmap = regmap;
1047         rm_field->reg = reg_field.reg;
1048         rm_field->shift = reg_field.lsb;
1049         rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
1050         rm_field->id_size = reg_field.id_size;
1051         rm_field->id_offset = reg_field.id_offset;
1052 }
1053
1054 /**
1055  * devm_regmap_field_alloc(): Allocate and initialise a register field
1056  * in a register map.
1057  *
1058  * @dev: Device that will be interacted with
1059  * @regmap: regmap bank in which this register field is located.
1060  * @reg_field: Register field with in the bank.
1061  *
1062  * The return value will be an ERR_PTR() on error or a valid pointer
1063  * to a struct regmap_field. The regmap_field will be automatically freed
1064  * by the device management code.
1065  */
1066 struct regmap_field *devm_regmap_field_alloc(struct device *dev,
1067                 struct regmap *regmap, struct reg_field reg_field)
1068 {
1069         struct regmap_field *rm_field = devm_kzalloc(dev,
1070                                         sizeof(*rm_field), GFP_KERNEL);
1071         if (!rm_field)
1072                 return ERR_PTR(-ENOMEM);
1073
1074         regmap_field_init(rm_field, regmap, reg_field);
1075
1076         return rm_field;
1077
1078 }
1079 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
1080
1081 /**
1082  * devm_regmap_field_free(): Free register field allocated using
1083  * devm_regmap_field_alloc. Usally drivers need not call this function,
1084  * as the memory allocated via devm will be freed as per device-driver
1085  * life-cyle.
1086  *
1087  * @dev: Device that will be interacted with
1088  * @field: regmap field which should be freed.
1089  */
1090 void devm_regmap_field_free(struct device *dev,
1091         struct regmap_field *field)
1092 {
1093         devm_kfree(dev, field);
1094 }
1095 EXPORT_SYMBOL_GPL(devm_regmap_field_free);
1096
1097 /**
1098  * regmap_field_alloc(): Allocate and initialise a register field
1099  * in a register map.
1100  *
1101  * @regmap: regmap bank in which this register field is located.
1102  * @reg_field: Register field with in the bank.
1103  *
1104  * The return value will be an ERR_PTR() on error or a valid pointer
1105  * to a struct regmap_field. The regmap_field should be freed by the
1106  * user once its finished working with it using regmap_field_free().
1107  */
1108 struct regmap_field *regmap_field_alloc(struct regmap *regmap,
1109                 struct reg_field reg_field)
1110 {
1111         struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
1112
1113         if (!rm_field)
1114                 return ERR_PTR(-ENOMEM);
1115
1116         regmap_field_init(rm_field, regmap, reg_field);
1117
1118         return rm_field;
1119 }
1120 EXPORT_SYMBOL_GPL(regmap_field_alloc);
1121
1122 /**
1123  * regmap_field_free(): Free register field allocated using regmap_field_alloc
1124  *
1125  * @field: regmap field which should be freed.
1126  */
1127 void regmap_field_free(struct regmap_field *field)
1128 {
1129         kfree(field);
1130 }
1131 EXPORT_SYMBOL_GPL(regmap_field_free);
1132
1133 /**
1134  * regmap_reinit_cache(): Reinitialise the current register cache
1135  *
1136  * @map: Register map to operate on.
1137  * @config: New configuration.  Only the cache data will be used.
1138  *
1139  * Discard any existing register cache for the map and initialize a
1140  * new cache.  This can be used to restore the cache to defaults or to
1141  * update the cache configuration to reflect runtime discovery of the
1142  * hardware.
1143  *
1144  * No explicit locking is done here, the user needs to ensure that
1145  * this function will not race with other calls to regmap.
1146  */
1147 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
1148 {
1149         regcache_exit(map);
1150         regmap_debugfs_exit(map);
1151
1152         map->max_register = config->max_register;
1153         map->writeable_reg = config->writeable_reg;
1154         map->readable_reg = config->readable_reg;
1155         map->volatile_reg = config->volatile_reg;
1156         map->precious_reg = config->precious_reg;
1157         map->cache_type = config->cache_type;
1158
1159         regmap_debugfs_init(map, config->name);
1160
1161         map->cache_bypass = false;
1162         map->cache_only = false;
1163
1164         return regcache_init(map, config);
1165 }
1166 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
1167
1168 /**
1169  * regmap_exit(): Free a previously allocated register map
1170  */
1171 void regmap_exit(struct regmap *map)
1172 {
1173         struct regmap_async *async;
1174
1175         regcache_exit(map);
1176         regmap_debugfs_exit(map);
1177         regmap_range_exit(map);
1178         if (map->bus && map->bus->free_context)
1179                 map->bus->free_context(map->bus_context);
1180         kfree(map->work_buf);
1181         while (!list_empty(&map->async_free)) {
1182                 async = list_first_entry_or_null(&map->async_free,
1183                                                  struct regmap_async,
1184                                                  list);
1185                 list_del(&async->list);
1186                 kfree(async->work_buf);
1187                 kfree(async);
1188         }
1189         kfree(map);
1190 }
1191 EXPORT_SYMBOL_GPL(regmap_exit);
1192
1193 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
1194 {
1195         struct regmap **r = res;
1196         if (!r || !*r) {
1197                 WARN_ON(!r || !*r);
1198                 return 0;
1199         }
1200
1201         /* If the user didn't specify a name match any */
1202         if (data)
1203                 return (*r)->name == data;
1204         else
1205                 return 1;
1206 }
1207
1208 /**
1209  * dev_get_regmap(): Obtain the regmap (if any) for a device
1210  *
1211  * @dev: Device to retrieve the map for
1212  * @name: Optional name for the register map, usually NULL.
1213  *
1214  * Returns the regmap for the device if one is present, or NULL.  If
1215  * name is specified then it must match the name specified when
1216  * registering the device, if it is NULL then the first regmap found
1217  * will be used.  Devices with multiple register maps are very rare,
1218  * generic code should normally not need to specify a name.
1219  */
1220 struct regmap *dev_get_regmap(struct device *dev, const char *name)
1221 {
1222         struct regmap **r = devres_find(dev, dev_get_regmap_release,
1223                                         dev_get_regmap_match, (void *)name);
1224
1225         if (!r)
1226                 return NULL;
1227         return *r;
1228 }
1229 EXPORT_SYMBOL_GPL(dev_get_regmap);
1230
1231 /**
1232  * regmap_get_device(): Obtain the device from a regmap
1233  *
1234  * @map: Register map to operate on.
1235  *
1236  * Returns the underlying device that the regmap has been created for.
1237  */
1238 struct device *regmap_get_device(struct regmap *map)
1239 {
1240         return map->dev;
1241 }
1242 EXPORT_SYMBOL_GPL(regmap_get_device);
1243
1244 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
1245                                struct regmap_range_node *range,
1246                                unsigned int val_num)
1247 {
1248         void *orig_work_buf;
1249         unsigned int win_offset;
1250         unsigned int win_page;
1251         bool page_chg;
1252         int ret;
1253
1254         win_offset = (*reg - range->range_min) % range->window_len;
1255         win_page = (*reg - range->range_min) / range->window_len;
1256
1257         if (val_num > 1) {
1258                 /* Bulk write shouldn't cross range boundary */
1259                 if (*reg + val_num - 1 > range->range_max)
1260                         return -EINVAL;
1261
1262                 /* ... or single page boundary */
1263                 if (val_num > range->window_len - win_offset)
1264                         return -EINVAL;
1265         }
1266
1267         /* It is possible to have selector register inside data window.
1268            In that case, selector register is located on every page and
1269            it needs no page switching, when accessed alone. */
1270         if (val_num > 1 ||
1271             range->window_start + win_offset != range->selector_reg) {
1272                 /* Use separate work_buf during page switching */
1273                 orig_work_buf = map->work_buf;
1274                 map->work_buf = map->selector_work_buf;
1275
1276                 ret = _regmap_update_bits(map, range->selector_reg,
1277                                           range->selector_mask,
1278                                           win_page << range->selector_shift,
1279                                           &page_chg, false);
1280
1281                 map->work_buf = orig_work_buf;
1282
1283                 if (ret != 0)
1284                         return ret;
1285         }
1286
1287         *reg = range->window_start + win_offset;
1288
1289         return 0;
1290 }
1291
1292 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1293                       const void *val, size_t val_len)
1294 {
1295         struct regmap_range_node *range;
1296         unsigned long flags;
1297         u8 *u8 = map->work_buf;
1298         void *work_val = map->work_buf + map->format.reg_bytes +
1299                 map->format.pad_bytes;
1300         void *buf;
1301         int ret = -ENOTSUPP;
1302         size_t len;
1303         int i;
1304
1305         WARN_ON(!map->bus);
1306
1307         /* Check for unwritable registers before we start */
1308         if (map->writeable_reg)
1309                 for (i = 0; i < val_len / map->format.val_bytes; i++)
1310                         if (!map->writeable_reg(map->dev,
1311                                                 reg + (i * map->reg_stride)))
1312                                 return -EINVAL;
1313
1314         if (!map->cache_bypass && map->format.parse_val) {
1315                 unsigned int ival;
1316                 int val_bytes = map->format.val_bytes;
1317                 for (i = 0; i < val_len / val_bytes; i++) {
1318                         ival = map->format.parse_val(val + (i * val_bytes));
1319                         ret = regcache_write(map, reg + (i * map->reg_stride),
1320                                              ival);
1321                         if (ret) {
1322                                 dev_err(map->dev,
1323                                         "Error in caching of register: %x ret: %d\n",
1324                                         reg + i, ret);
1325                                 return ret;
1326                         }
1327                 }
1328                 if (map->cache_only) {
1329                         map->cache_dirty = true;
1330                         return 0;
1331                 }
1332         }
1333
1334         range = _regmap_range_lookup(map, reg);
1335         if (range) {
1336                 int val_num = val_len / map->format.val_bytes;
1337                 int win_offset = (reg - range->range_min) % range->window_len;
1338                 int win_residue = range->window_len - win_offset;
1339
1340                 /* If the write goes beyond the end of the window split it */
1341                 while (val_num > win_residue) {
1342                         dev_dbg(map->dev, "Writing window %d/%zu\n",
1343                                 win_residue, val_len / map->format.val_bytes);
1344                         ret = _regmap_raw_write(map, reg, val, win_residue *
1345                                                 map->format.val_bytes);
1346                         if (ret != 0)
1347                                 return ret;
1348
1349                         reg += win_residue;
1350                         val_num -= win_residue;
1351                         val += win_residue * map->format.val_bytes;
1352                         val_len -= win_residue * map->format.val_bytes;
1353
1354                         win_offset = (reg - range->range_min) %
1355                                 range->window_len;
1356                         win_residue = range->window_len - win_offset;
1357                 }
1358
1359                 ret = _regmap_select_page(map, &reg, range, val_num);
1360                 if (ret != 0)
1361                         return ret;
1362         }
1363
1364         map->format.format_reg(map->work_buf, reg, map->reg_shift);
1365
1366         u8[0] |= map->write_flag_mask;
1367
1368         /*
1369          * Essentially all I/O mechanisms will be faster with a single
1370          * buffer to write.  Since register syncs often generate raw
1371          * writes of single registers optimise that case.
1372          */
1373         if (val != work_val && val_len == map->format.val_bytes) {
1374                 memcpy(work_val, val, map->format.val_bytes);
1375                 val = work_val;
1376         }
1377
1378         if (map->async && map->bus->async_write) {
1379                 struct regmap_async *async;
1380
1381                 trace_regmap_async_write_start(map, reg, val_len);
1382
1383                 spin_lock_irqsave(&map->async_lock, flags);
1384                 async = list_first_entry_or_null(&map->async_free,
1385                                                  struct regmap_async,
1386                                                  list);
1387                 if (async)
1388                         list_del(&async->list);
1389                 spin_unlock_irqrestore(&map->async_lock, flags);
1390
1391                 if (!async) {
1392                         async = map->bus->async_alloc();
1393                         if (!async)
1394                                 return -ENOMEM;
1395
1396                         async->work_buf = kzalloc(map->format.buf_size,
1397                                                   GFP_KERNEL | GFP_DMA);
1398                         if (!async->work_buf) {
1399                                 kfree(async);
1400                                 return -ENOMEM;
1401                         }
1402                 }
1403
1404                 async->map = map;
1405
1406                 /* If the caller supplied the value we can use it safely. */
1407                 memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
1408                        map->format.reg_bytes + map->format.val_bytes);
1409
1410                 spin_lock_irqsave(&map->async_lock, flags);
1411                 list_add_tail(&async->list, &map->async_list);
1412                 spin_unlock_irqrestore(&map->async_lock, flags);
1413
1414                 if (val != work_val)
1415                         ret = map->bus->async_write(map->bus_context,
1416                                                     async->work_buf,
1417                                                     map->format.reg_bytes +
1418                                                     map->format.pad_bytes,
1419                                                     val, val_len, async);
1420                 else
1421                         ret = map->bus->async_write(map->bus_context,
1422                                                     async->work_buf,
1423                                                     map->format.reg_bytes +
1424                                                     map->format.pad_bytes +
1425                                                     val_len, NULL, 0, async);
1426
1427                 if (ret != 0) {
1428                         dev_err(map->dev, "Failed to schedule write: %d\n",
1429                                 ret);
1430
1431                         spin_lock_irqsave(&map->async_lock, flags);
1432                         list_move(&async->list, &map->async_free);
1433                         spin_unlock_irqrestore(&map->async_lock, flags);
1434                 }
1435
1436                 return ret;
1437         }
1438
1439         trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
1440
1441         /* If we're doing a single register write we can probably just
1442          * send the work_buf directly, otherwise try to do a gather
1443          * write.
1444          */
1445         if (val == work_val)
1446                 ret = map->bus->write(map->bus_context, map->work_buf,
1447                                       map->format.reg_bytes +
1448                                       map->format.pad_bytes +
1449                                       val_len);
1450         else if (map->bus->gather_write)
1451                 ret = map->bus->gather_write(map->bus_context, map->work_buf,
1452                                              map->format.reg_bytes +
1453                                              map->format.pad_bytes,
1454                                              val, val_len);
1455
1456         /* If that didn't work fall back on linearising by hand. */
1457         if (ret == -ENOTSUPP) {
1458                 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
1459                 buf = kzalloc(len, GFP_KERNEL);
1460                 if (!buf)
1461                         return -ENOMEM;
1462
1463                 memcpy(buf, map->work_buf, map->format.reg_bytes);
1464                 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
1465                        val, val_len);
1466                 ret = map->bus->write(map->bus_context, buf, len);
1467
1468                 kfree(buf);
1469         }
1470
1471         trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
1472
1473         return ret;
1474 }
1475
1476 /**
1477  * regmap_can_raw_write - Test if regmap_raw_write() is supported
1478  *
1479  * @map: Map to check.
1480  */
1481 bool regmap_can_raw_write(struct regmap *map)
1482 {
1483         return map->bus && map->bus->write && map->format.format_val &&
1484                 map->format.format_reg;
1485 }
1486 EXPORT_SYMBOL_GPL(regmap_can_raw_write);
1487
1488 /**
1489  * regmap_get_raw_read_max - Get the maximum size we can read
1490  *
1491  * @map: Map to check.
1492  */
1493 size_t regmap_get_raw_read_max(struct regmap *map)
1494 {
1495         return map->max_raw_read;
1496 }
1497 EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
1498
1499 /**
1500  * regmap_get_raw_write_max - Get the maximum size we can read
1501  *
1502  * @map: Map to check.
1503  */
1504 size_t regmap_get_raw_write_max(struct regmap *map)
1505 {
1506         return map->max_raw_write;
1507 }
1508 EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
1509
1510 static int _regmap_bus_formatted_write(void *context, unsigned int reg,
1511                                        unsigned int val)
1512 {
1513         int ret;
1514         struct regmap_range_node *range;
1515         struct regmap *map = context;
1516
1517         WARN_ON(!map->bus || !map->format.format_write);
1518
1519         range = _regmap_range_lookup(map, reg);
1520         if (range) {
1521                 ret = _regmap_select_page(map, &reg, range, 1);
1522                 if (ret != 0)
1523                         return ret;
1524         }
1525
1526         map->format.format_write(map, reg, val);
1527
1528         trace_regmap_hw_write_start(map, reg, 1);
1529
1530         ret = map->bus->write(map->bus_context, map->work_buf,
1531                               map->format.buf_size);
1532
1533         trace_regmap_hw_write_done(map, reg, 1);
1534
1535         return ret;
1536 }
1537
1538 static int _regmap_bus_reg_write(void *context, unsigned int reg,
1539                                  unsigned int val)
1540 {
1541         struct regmap *map = context;
1542
1543         return map->bus->reg_write(map->bus_context, reg, val);
1544 }
1545
1546 static int _regmap_bus_raw_write(void *context, unsigned int reg,
1547                                  unsigned int val)
1548 {
1549         struct regmap *map = context;
1550
1551         WARN_ON(!map->bus || !map->format.format_val);
1552
1553         map->format.format_val(map->work_buf + map->format.reg_bytes
1554                                + map->format.pad_bytes, val, 0);
1555         return _regmap_raw_write(map, reg,
1556                                  map->work_buf +
1557                                  map->format.reg_bytes +
1558                                  map->format.pad_bytes,
1559                                  map->format.val_bytes);
1560 }
1561
1562 static inline void *_regmap_map_get_context(struct regmap *map)
1563 {
1564         return (map->bus) ? map : map->bus_context;
1565 }
1566
1567 int _regmap_write(struct regmap *map, unsigned int reg,
1568                   unsigned int val)
1569 {
1570         int ret;
1571         void *context = _regmap_map_get_context(map);
1572
1573         if (!regmap_writeable(map, reg))
1574                 return -EIO;
1575
1576         if (!map->cache_bypass && !map->defer_caching) {
1577                 ret = regcache_write(map, reg, val);
1578                 if (ret != 0)
1579                         return ret;
1580                 if (map->cache_only) {
1581                         map->cache_dirty = true;
1582                         return 0;
1583                 }
1584         }
1585
1586 #ifdef LOG_DEVICE
1587         if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1588                 dev_info(map->dev, "%x <= %x\n", reg, val);
1589 #endif
1590
1591         trace_regmap_reg_write(map, reg, val);
1592
1593         return map->reg_write(context, reg, val);
1594 }
1595
1596 /**
1597  * regmap_write(): Write a value to a single register
1598  *
1599  * @map: Register map to write to
1600  * @reg: Register to write to
1601  * @val: Value to be written
1602  *
1603  * A value of zero will be returned on success, a negative errno will
1604  * be returned in error cases.
1605  */
1606 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1607 {
1608         int ret;
1609
1610         if (!IS_ALIGNED(reg, map->reg_stride))
1611                 return -EINVAL;
1612
1613         map->lock(map->lock_arg);
1614
1615         ret = _regmap_write(map, reg, val);
1616
1617         map->unlock(map->lock_arg);
1618
1619         return ret;
1620 }
1621 EXPORT_SYMBOL_GPL(regmap_write);
1622
1623 /**
1624  * regmap_write_async(): Write a value to a single register asynchronously
1625  *
1626  * @map: Register map to write to
1627  * @reg: Register to write to
1628  * @val: Value to be written
1629  *
1630  * A value of zero will be returned on success, a negative errno will
1631  * be returned in error cases.
1632  */
1633 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
1634 {
1635         int ret;
1636
1637         if (!IS_ALIGNED(reg, map->reg_stride))
1638                 return -EINVAL;
1639
1640         map->lock(map->lock_arg);
1641
1642         map->async = true;
1643
1644         ret = _regmap_write(map, reg, val);
1645
1646         map->async = false;
1647
1648         map->unlock(map->lock_arg);
1649
1650         return ret;
1651 }
1652 EXPORT_SYMBOL_GPL(regmap_write_async);
1653
1654 /**
1655  * regmap_raw_write(): Write raw values to one or more registers
1656  *
1657  * @map: Register map to write to
1658  * @reg: Initial register to write to
1659  * @val: Block of data to be written, laid out for direct transmission to the
1660  *       device
1661  * @val_len: Length of data pointed to by val.
1662  *
1663  * This function is intended to be used for things like firmware
1664  * download where a large block of data needs to be transferred to the
1665  * device.  No formatting will be done on the data provided.
1666  *
1667  * A value of zero will be returned on success, a negative errno will
1668  * be returned in error cases.
1669  */
1670 int regmap_raw_write(struct regmap *map, unsigned int reg,
1671                      const void *val, size_t val_len)
1672 {
1673         int ret;
1674
1675         if (!regmap_can_raw_write(map))
1676                 return -EINVAL;
1677         if (val_len % map->format.val_bytes)
1678                 return -EINVAL;
1679         if (map->max_raw_write && map->max_raw_write > val_len)
1680                 return -E2BIG;
1681
1682         map->lock(map->lock_arg);
1683
1684         ret = _regmap_raw_write(map, reg, val, val_len);
1685
1686         map->unlock(map->lock_arg);
1687
1688         return ret;
1689 }
1690 EXPORT_SYMBOL_GPL(regmap_raw_write);
1691
1692 /**
1693  * regmap_field_update_bits_base():
1694  *      Perform a read/modify/write cycle on the register field
1695  *      with change, async, force option
1696  *
1697  * @field: Register field to write to
1698  * @mask: Bitmask to change
1699  * @val: Value to be written
1700  * @change: Boolean indicating if a write was done
1701  * @async: Boolean indicating asynchronously
1702  * @force: Boolean indicating use force update
1703  *
1704  * A value of zero will be returned on success, a negative errno will
1705  * be returned in error cases.
1706  */
1707 int regmap_field_update_bits_base(struct regmap_field *field,
1708                                   unsigned int mask, unsigned int val,
1709                                   bool *change, bool async, bool force)
1710 {
1711         mask = (mask << field->shift) & field->mask;
1712
1713         return regmap_update_bits_base(field->regmap, field->reg,
1714                                        mask, val << field->shift,
1715                                        change, async, force);
1716 }
1717 EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
1718
1719 /**
1720  * regmap_fields_update_bits_base():
1721  *      Perform a read/modify/write cycle on the register field
1722  *      with change, async, force option
1723  *
1724  * @field: Register field to write to
1725  * @id: port ID
1726  * @mask: Bitmask to change
1727  * @val: Value to be written
1728  * @change: Boolean indicating if a write was done
1729  * @async: Boolean indicating asynchronously
1730  * @force: Boolean indicating use force update
1731  *
1732  * A value of zero will be returned on success, a negative errno will
1733  * be returned in error cases.
1734  */
1735 int regmap_fields_update_bits_base(struct regmap_field *field,  unsigned int id,
1736                                    unsigned int mask, unsigned int val,
1737                                    bool *change, bool async, bool force)
1738 {
1739         if (id >= field->id_size)
1740                 return -EINVAL;
1741
1742         mask = (mask << field->shift) & field->mask;
1743
1744         return regmap_update_bits_base(field->regmap,
1745                                        field->reg + (field->id_offset * id),
1746                                        mask, val << field->shift,
1747                                        change, async, force);
1748 }
1749 EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
1750
1751 /*
1752  * regmap_bulk_write(): Write multiple registers to the device
1753  *
1754  * @map: Register map to write to
1755  * @reg: First register to be write from
1756  * @val: Block of data to be written, in native register size for device
1757  * @val_count: Number of registers to write
1758  *
1759  * This function is intended to be used for writing a large block of
1760  * data to the device either in single transfer or multiple transfer.
1761  *
1762  * A value of zero will be returned on success, a negative errno will
1763  * be returned in error cases.
1764  */
1765 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1766                      size_t val_count)
1767 {
1768         int ret = 0, i;
1769         size_t val_bytes = map->format.val_bytes;
1770         size_t total_size = val_bytes * val_count;
1771
1772         if (map->bus && !map->format.parse_inplace)
1773                 return -EINVAL;
1774         if (!IS_ALIGNED(reg, map->reg_stride))
1775                 return -EINVAL;
1776
1777         /*
1778          * Some devices don't support bulk write, for
1779          * them we have a series of single write operations in the first two if
1780          * blocks.
1781          *
1782          * The first if block is used for memory mapped io. It does not allow
1783          * val_bytes of 3 for example.
1784          * The second one is used for busses which do not have this limitation
1785          * and can write arbitrary value lengths.
1786          */
1787         if (!map->bus) {
1788                 map->lock(map->lock_arg);
1789                 for (i = 0; i < val_count; i++) {
1790                         unsigned int ival;
1791
1792                         switch (val_bytes) {
1793                         case 1:
1794                                 ival = *(u8 *)(val + (i * val_bytes));
1795                                 break;
1796                         case 2:
1797                                 ival = *(u16 *)(val + (i * val_bytes));
1798                                 break;
1799                         case 4:
1800                                 ival = *(u32 *)(val + (i * val_bytes));
1801                                 break;
1802 #ifdef CONFIG_64BIT
1803                         case 8:
1804                                 ival = *(u64 *)(val + (i * val_bytes));
1805                                 break;
1806 #endif
1807                         default:
1808                                 ret = -EINVAL;
1809                                 goto out;
1810                         }
1811
1812                         ret = _regmap_write(map, reg + (i * map->reg_stride),
1813                                         ival);
1814                         if (ret != 0)
1815                                 goto out;
1816                 }
1817 out:
1818                 map->unlock(map->lock_arg);
1819         } else if (map->use_single_write ||
1820                    (map->max_raw_write && map->max_raw_write < total_size)) {
1821                 int chunk_stride = map->reg_stride;
1822                 size_t chunk_size = val_bytes;
1823                 size_t chunk_count = val_count;
1824
1825                 if (!map->use_single_write) {
1826                         chunk_size = map->max_raw_write;
1827                         if (chunk_size % val_bytes)
1828                                 chunk_size -= chunk_size % val_bytes;
1829                         chunk_count = total_size / chunk_size;
1830                         chunk_stride *= chunk_size / val_bytes;
1831                 }
1832
1833                 map->lock(map->lock_arg);
1834                 /* Write as many bytes as possible with chunk_size */
1835                 for (i = 0; i < chunk_count; i++) {
1836                         ret = _regmap_raw_write(map,
1837                                                 reg + (i * chunk_stride),
1838                                                 val + (i * chunk_size),
1839                                                 chunk_size);
1840                         if (ret)
1841                                 break;
1842                 }
1843
1844                 /* Write remaining bytes */
1845                 if (!ret && chunk_size * i < total_size) {
1846                         ret = _regmap_raw_write(map, reg + (i * chunk_stride),
1847                                                 val + (i * chunk_size),
1848                                                 total_size - i * chunk_size);
1849                 }
1850                 map->unlock(map->lock_arg);
1851         } else {
1852                 void *wval;
1853
1854                 if (!val_count)
1855                         return -EINVAL;
1856
1857                 wval = kmemdup(val, val_count * val_bytes, map->alloc_flags);
1858                 if (!wval) {
1859                         dev_err(map->dev, "Error in memory allocation\n");
1860                         return -ENOMEM;
1861                 }
1862                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1863                         map->format.parse_inplace(wval + i);
1864
1865                 map->lock(map->lock_arg);
1866                 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1867                 map->unlock(map->lock_arg);
1868
1869                 kfree(wval);
1870         }
1871         return ret;
1872 }
1873 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1874
1875 /*
1876  * _regmap_raw_multi_reg_write()
1877  *
1878  * the (register,newvalue) pairs in regs have not been formatted, but
1879  * they are all in the same page and have been changed to being page
1880  * relative. The page register has been written if that was necessary.
1881  */
1882 static int _regmap_raw_multi_reg_write(struct regmap *map,
1883                                        const struct reg_sequence *regs,
1884                                        size_t num_regs)
1885 {
1886         int ret;
1887         void *buf;
1888         int i;
1889         u8 *u8;
1890         size_t val_bytes = map->format.val_bytes;
1891         size_t reg_bytes = map->format.reg_bytes;
1892         size_t pad_bytes = map->format.pad_bytes;
1893         size_t pair_size = reg_bytes + pad_bytes + val_bytes;
1894         size_t len = pair_size * num_regs;
1895
1896         if (!len)
1897                 return -EINVAL;
1898
1899         buf = kzalloc(len, GFP_KERNEL);
1900         if (!buf)
1901                 return -ENOMEM;
1902
1903         /* We have to linearise by hand. */
1904
1905         u8 = buf;
1906
1907         for (i = 0; i < num_regs; i++) {
1908                 unsigned int reg = regs[i].reg;
1909                 unsigned int val = regs[i].def;
1910                 trace_regmap_hw_write_start(map, reg, 1);
1911                 map->format.format_reg(u8, reg, map->reg_shift);
1912                 u8 += reg_bytes + pad_bytes;
1913                 map->format.format_val(u8, val, 0);
1914                 u8 += val_bytes;
1915         }
1916         u8 = buf;
1917         *u8 |= map->write_flag_mask;
1918
1919         ret = map->bus->write(map->bus_context, buf, len);
1920
1921         kfree(buf);
1922
1923         for (i = 0; i < num_regs; i++) {
1924                 int reg = regs[i].reg;
1925                 trace_regmap_hw_write_done(map, reg, 1);
1926         }
1927         return ret;
1928 }
1929
1930 static unsigned int _regmap_register_page(struct regmap *map,
1931                                           unsigned int reg,
1932                                           struct regmap_range_node *range)
1933 {
1934         unsigned int win_page = (reg - range->range_min) / range->window_len;
1935
1936         return win_page;
1937 }
1938
1939 static int _regmap_range_multi_paged_reg_write(struct regmap *map,
1940                                                struct reg_sequence *regs,
1941                                                size_t num_regs)
1942 {
1943         int ret;
1944         int i, n;
1945         struct reg_sequence *base;
1946         unsigned int this_page = 0;
1947         unsigned int page_change = 0;
1948         /*
1949          * the set of registers are not neccessarily in order, but
1950          * since the order of write must be preserved this algorithm
1951          * chops the set each time the page changes. This also applies
1952          * if there is a delay required at any point in the sequence.
1953          */
1954         base = regs;
1955         for (i = 0, n = 0; i < num_regs; i++, n++) {
1956                 unsigned int reg = regs[i].reg;
1957                 struct regmap_range_node *range;
1958
1959                 range = _regmap_range_lookup(map, reg);
1960                 if (range) {
1961                         unsigned int win_page = _regmap_register_page(map, reg,
1962                                                                       range);
1963
1964                         if (i == 0)
1965                                 this_page = win_page;
1966                         if (win_page != this_page) {
1967                                 this_page = win_page;
1968                                 page_change = 1;
1969                         }
1970                 }
1971
1972                 /* If we have both a page change and a delay make sure to
1973                  * write the regs and apply the delay before we change the
1974                  * page.
1975                  */
1976
1977                 if (page_change || regs[i].delay_us) {
1978
1979                                 /* For situations where the first write requires
1980                                  * a delay we need to make sure we don't call
1981                                  * raw_multi_reg_write with n=0
1982                                  * This can't occur with page breaks as we
1983                                  * never write on the first iteration
1984                                  */
1985                                 if (regs[i].delay_us && i == 0)
1986                                         n = 1;
1987
1988                                 ret = _regmap_raw_multi_reg_write(map, base, n);
1989                                 if (ret != 0)
1990                                         return ret;
1991
1992                                 if (regs[i].delay_us)
1993                                         udelay(regs[i].delay_us);
1994
1995                                 base += n;
1996                                 n = 0;
1997
1998                                 if (page_change) {
1999                                         ret = _regmap_select_page(map,
2000                                                                   &base[n].reg,
2001                                                                   range, 1);
2002                                         if (ret != 0)
2003                                                 return ret;
2004
2005                                         page_change = 0;
2006                                 }
2007
2008                 }
2009
2010         }
2011         if (n > 0)
2012                 return _regmap_raw_multi_reg_write(map, base, n);
2013         return 0;
2014 }
2015
2016 static int _regmap_multi_reg_write(struct regmap *map,
2017                                    const struct reg_sequence *regs,
2018                                    size_t num_regs)
2019 {
2020         int i;
2021         int ret;
2022
2023         if (!map->can_multi_write) {
2024                 for (i = 0; i < num_regs; i++) {
2025                         ret = _regmap_write(map, regs[i].reg, regs[i].def);
2026                         if (ret != 0)
2027                                 return ret;
2028
2029                         if (regs[i].delay_us)
2030                                 udelay(regs[i].delay_us);
2031                 }
2032                 return 0;
2033         }
2034
2035         if (!map->format.parse_inplace)
2036                 return -EINVAL;
2037
2038         if (map->writeable_reg)
2039                 for (i = 0; i < num_regs; i++) {
2040                         int reg = regs[i].reg;
2041                         if (!map->writeable_reg(map->dev, reg))
2042                                 return -EINVAL;
2043                         if (!IS_ALIGNED(reg, map->reg_stride))
2044                                 return -EINVAL;
2045                 }
2046
2047         if (!map->cache_bypass) {
2048                 for (i = 0; i < num_regs; i++) {
2049                         unsigned int val = regs[i].def;
2050                         unsigned int reg = regs[i].reg;
2051                         ret = regcache_write(map, reg, val);
2052                         if (ret) {
2053                                 dev_err(map->dev,
2054                                 "Error in caching of register: %x ret: %d\n",
2055                                                                 reg, ret);
2056                                 return ret;
2057                         }
2058                 }
2059                 if (map->cache_only) {
2060                         map->cache_dirty = true;
2061                         return 0;
2062                 }
2063         }
2064
2065         WARN_ON(!map->bus);
2066
2067         for (i = 0; i < num_regs; i++) {
2068                 unsigned int reg = regs[i].reg;
2069                 struct regmap_range_node *range;
2070
2071                 /* Coalesce all the writes between a page break or a delay
2072                  * in a sequence
2073                  */
2074                 range = _regmap_range_lookup(map, reg);
2075                 if (range || regs[i].delay_us) {
2076                         size_t len = sizeof(struct reg_sequence)*num_regs;
2077                         struct reg_sequence *base = kmemdup(regs, len,
2078                                                            GFP_KERNEL);
2079                         if (!base)
2080                                 return -ENOMEM;
2081                         ret = _regmap_range_multi_paged_reg_write(map, base,
2082                                                                   num_regs);
2083                         kfree(base);
2084
2085                         return ret;
2086                 }
2087         }
2088         return _regmap_raw_multi_reg_write(map, regs, num_regs);
2089 }
2090
2091 /*
2092  * regmap_multi_reg_write(): Write multiple registers to the device
2093  *
2094  * where the set of register,value pairs are supplied in any order,
2095  * possibly not all in a single range.
2096  *
2097  * @map: Register map to write to
2098  * @regs: Array of structures containing register,value to be written
2099  * @num_regs: Number of registers to write
2100  *
2101  * The 'normal' block write mode will send ultimately send data on the
2102  * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
2103  * addressed. However, this alternative block multi write mode will send
2104  * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
2105  * must of course support the mode.
2106  *
2107  * A value of zero will be returned on success, a negative errno will be
2108  * returned in error cases.
2109  */
2110 int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
2111                            int num_regs)
2112 {
2113         int ret;
2114
2115         map->lock(map->lock_arg);
2116
2117         ret = _regmap_multi_reg_write(map, regs, num_regs);
2118
2119         map->unlock(map->lock_arg);
2120
2121         return ret;
2122 }
2123 EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
2124
2125 /*
2126  * regmap_multi_reg_write_bypassed(): Write multiple registers to the
2127  *                                    device but not the cache
2128  *
2129  * where the set of register are supplied in any order
2130  *
2131  * @map: Register map to write to
2132  * @regs: Array of structures containing register,value to be written
2133  * @num_regs: Number of registers to write
2134  *
2135  * This function is intended to be used for writing a large block of data
2136  * atomically to the device in single transfer for those I2C client devices
2137  * that implement this alternative block write mode.
2138  *
2139  * A value of zero will be returned on success, a negative errno will
2140  * be returned in error cases.
2141  */
2142 int regmap_multi_reg_write_bypassed(struct regmap *map,
2143                                     const struct reg_sequence *regs,
2144                                     int num_regs)
2145 {
2146         int ret;
2147         bool bypass;
2148
2149         map->lock(map->lock_arg);
2150
2151         bypass = map->cache_bypass;
2152         map->cache_bypass = true;
2153
2154         ret = _regmap_multi_reg_write(map, regs, num_regs);
2155
2156         map->cache_bypass = bypass;
2157
2158         map->unlock(map->lock_arg);
2159
2160         return ret;
2161 }
2162 EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
2163
2164 /**
2165  * regmap_raw_write_async(): Write raw values to one or more registers
2166  *                           asynchronously
2167  *
2168  * @map: Register map to write to
2169  * @reg: Initial register to write to
2170  * @val: Block of data to be written, laid out for direct transmission to the
2171  *       device.  Must be valid until regmap_async_complete() is called.
2172  * @val_len: Length of data pointed to by val.
2173  *
2174  * This function is intended to be used for things like firmware
2175  * download where a large block of data needs to be transferred to the
2176  * device.  No formatting will be done on the data provided.
2177  *
2178  * If supported by the underlying bus the write will be scheduled
2179  * asynchronously, helping maximise I/O speed on higher speed buses
2180  * like SPI.  regmap_async_complete() can be called to ensure that all
2181  * asynchrnous writes have been completed.
2182  *
2183  * A value of zero will be returned on success, a negative errno will
2184  * be returned in error cases.
2185  */
2186 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
2187                            const void *val, size_t val_len)
2188 {
2189         int ret;
2190
2191         if (val_len % map->format.val_bytes)
2192                 return -EINVAL;
2193         if (!IS_ALIGNED(reg, map->reg_stride))
2194                 return -EINVAL;
2195
2196         map->lock(map->lock_arg);
2197
2198         map->async = true;
2199
2200         ret = _regmap_raw_write(map, reg, val, val_len);
2201
2202         map->async = false;
2203
2204         map->unlock(map->lock_arg);
2205
2206         return ret;
2207 }
2208 EXPORT_SYMBOL_GPL(regmap_raw_write_async);
2209
2210 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2211                             unsigned int val_len)
2212 {
2213         struct regmap_range_node *range;
2214         u8 *u8 = map->work_buf;
2215         int ret;
2216
2217         WARN_ON(!map->bus);
2218
2219         range = _regmap_range_lookup(map, reg);
2220         if (range) {
2221                 ret = _regmap_select_page(map, &reg, range,
2222                                           val_len / map->format.val_bytes);
2223                 if (ret != 0)
2224                         return ret;
2225         }
2226
2227         map->format.format_reg(map->work_buf, reg, map->reg_shift);
2228
2229         /*
2230          * Some buses or devices flag reads by setting the high bits in the
2231          * register address; since it's always the high bits for all
2232          * current formats we can do this here rather than in
2233          * formatting.  This may break if we get interesting formats.
2234          */
2235         u8[0] |= map->read_flag_mask;
2236
2237         trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
2238
2239         ret = map->bus->read(map->bus_context, map->work_buf,
2240                              map->format.reg_bytes + map->format.pad_bytes,
2241                              val, val_len);
2242
2243         trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
2244
2245         return ret;
2246 }
2247
2248 static int _regmap_bus_reg_read(void *context, unsigned int reg,
2249                                 unsigned int *val)
2250 {
2251         struct regmap *map = context;
2252
2253         return map->bus->reg_read(map->bus_context, reg, val);
2254 }
2255
2256 static int _regmap_bus_read(void *context, unsigned int reg,
2257                             unsigned int *val)
2258 {
2259         int ret;
2260         struct regmap *map = context;
2261
2262         if (!map->format.parse_val)
2263                 return -EINVAL;
2264
2265         ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
2266         if (ret == 0)
2267                 *val = map->format.parse_val(map->work_buf);
2268
2269         return ret;
2270 }
2271
2272 static int _regmap_read(struct regmap *map, unsigned int reg,
2273                         unsigned int *val)
2274 {
2275         int ret;
2276         void *context = _regmap_map_get_context(map);
2277
2278         if (!map->cache_bypass) {
2279                 ret = regcache_read(map, reg, val);
2280                 if (ret == 0)
2281                         return 0;
2282         }
2283
2284         if (map->cache_only)
2285                 return -EBUSY;
2286
2287         if (!regmap_readable(map, reg))
2288                 return -EIO;
2289
2290         ret = map->reg_read(context, reg, val);
2291         if (ret == 0) {
2292 #ifdef LOG_DEVICE
2293                 if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2294                         dev_info(map->dev, "%x => %x\n", reg, *val);
2295 #endif
2296
2297                 trace_regmap_reg_read(map, reg, *val);
2298
2299                 if (!map->cache_bypass)
2300                         regcache_write(map, reg, *val);
2301         }
2302
2303         return ret;
2304 }
2305
2306 /**
2307  * regmap_read(): Read a value from a single register
2308  *
2309  * @map: Register map to read from
2310  * @reg: Register to be read from
2311  * @val: Pointer to store read value
2312  *
2313  * A value of zero will be returned on success, a negative errno will
2314  * be returned in error cases.
2315  */
2316 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
2317 {
2318         int ret;
2319
2320         if (!IS_ALIGNED(reg, map->reg_stride))
2321                 return -EINVAL;
2322
2323         map->lock(map->lock_arg);
2324
2325         ret = _regmap_read(map, reg, val);
2326
2327         map->unlock(map->lock_arg);
2328
2329         return ret;
2330 }
2331 EXPORT_SYMBOL_GPL(regmap_read);
2332
2333 /**
2334  * regmap_raw_read(): Read raw data from the device
2335  *
2336  * @map: Register map to read from
2337  * @reg: First register to be read from
2338  * @val: Pointer to store read value
2339  * @val_len: Size of data to read
2340  *
2341  * A value of zero will be returned on success, a negative errno will
2342  * be returned in error cases.
2343  */
2344 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
2345                     size_t val_len)
2346 {
2347         size_t val_bytes = map->format.val_bytes;
2348         size_t val_count = val_len / val_bytes;
2349         unsigned int v;
2350         int ret, i;
2351
2352         if (!map->bus)
2353                 return -EINVAL;
2354         if (val_len % map->format.val_bytes)
2355                 return -EINVAL;
2356         if (!IS_ALIGNED(reg, map->reg_stride))
2357                 return -EINVAL;
2358         if (val_count == 0)
2359                 return -EINVAL;
2360
2361         map->lock(map->lock_arg);
2362
2363         if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
2364             map->cache_type == REGCACHE_NONE) {
2365                 if (!map->bus->read) {
2366                         ret = -ENOTSUPP;
2367                         goto out;
2368                 }
2369                 if (map->max_raw_read && map->max_raw_read < val_len) {
2370                         ret = -E2BIG;
2371                         goto out;
2372                 }
2373
2374                 /* Physical block read if there's no cache involved */
2375                 ret = _regmap_raw_read(map, reg, val, val_len);
2376
2377         } else {
2378                 /* Otherwise go word by word for the cache; should be low
2379                  * cost as we expect to hit the cache.
2380                  */
2381                 for (i = 0; i < val_count; i++) {
2382                         ret = _regmap_read(map, reg + (i * map->reg_stride),
2383                                            &v);
2384                         if (ret != 0)
2385                                 goto out;
2386
2387                         map->format.format_val(val + (i * val_bytes), v, 0);
2388                 }
2389         }
2390
2391  out:
2392         map->unlock(map->lock_arg);
2393
2394         return ret;
2395 }
2396 EXPORT_SYMBOL_GPL(regmap_raw_read);
2397
2398 /**
2399  * regmap_field_read(): Read a value to a single register field
2400  *
2401  * @field: Register field to read from
2402  * @val: Pointer to store read value
2403  *
2404  * A value of zero will be returned on success, a negative errno will
2405  * be returned in error cases.
2406  */
2407 int regmap_field_read(struct regmap_field *field, unsigned int *val)
2408 {
2409         int ret;
2410         unsigned int reg_val;
2411         ret = regmap_read(field->regmap, field->reg, &reg_val);
2412         if (ret != 0)
2413                 return ret;
2414
2415         reg_val &= field->mask;
2416         reg_val >>= field->shift;
2417         *val = reg_val;
2418
2419         return ret;
2420 }
2421 EXPORT_SYMBOL_GPL(regmap_field_read);
2422
2423 /**
2424  * regmap_fields_read(): Read a value to a single register field with port ID
2425  *
2426  * @field: Register field to read from
2427  * @id: port ID
2428  * @val: Pointer to store read value
2429  *
2430  * A value of zero will be returned on success, a negative errno will
2431  * be returned in error cases.
2432  */
2433 int regmap_fields_read(struct regmap_field *field, unsigned int id,
2434                        unsigned int *val)
2435 {
2436         int ret;
2437         unsigned int reg_val;
2438
2439         if (id >= field->id_size)
2440                 return -EINVAL;
2441
2442         ret = regmap_read(field->regmap,
2443                           field->reg + (field->id_offset * id),
2444                           &reg_val);
2445         if (ret != 0)
2446                 return ret;
2447
2448         reg_val &= field->mask;
2449         reg_val >>= field->shift;
2450         *val = reg_val;
2451
2452         return ret;
2453 }
2454 EXPORT_SYMBOL_GPL(regmap_fields_read);
2455
2456 /**
2457  * regmap_bulk_read(): Read multiple registers from the device
2458  *
2459  * @map: Register map to read from
2460  * @reg: First register to be read from
2461  * @val: Pointer to store read value, in native register size for device
2462  * @val_count: Number of registers to read
2463  *
2464  * A value of zero will be returned on success, a negative errno will
2465  * be returned in error cases.
2466  */
2467 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
2468                      size_t val_count)
2469 {
2470         int ret, i;
2471         size_t val_bytes = map->format.val_bytes;
2472         bool vol = regmap_volatile_range(map, reg, val_count);
2473
2474         if (!IS_ALIGNED(reg, map->reg_stride))
2475                 return -EINVAL;
2476
2477         if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
2478                 /*
2479                  * Some devices does not support bulk read, for
2480                  * them we have a series of single read operations.
2481                  */
2482                 size_t total_size = val_bytes * val_count;
2483
2484                 if (!map->use_single_read &&
2485                     (!map->max_raw_read || map->max_raw_read > total_size)) {
2486                         ret = regmap_raw_read(map, reg, val,
2487                                               val_bytes * val_count);
2488                         if (ret != 0)
2489                                 return ret;
2490                 } else {
2491                         /*
2492                          * Some devices do not support bulk read or do not
2493                          * support large bulk reads, for them we have a series
2494                          * of read operations.
2495                          */
2496                         int chunk_stride = map->reg_stride;
2497                         size_t chunk_size = val_bytes;
2498                         size_t chunk_count = val_count;
2499
2500                         if (!map->use_single_read) {
2501                                 chunk_size = map->max_raw_read;
2502                                 if (chunk_size % val_bytes)
2503                                         chunk_size -= chunk_size % val_bytes;
2504                                 chunk_count = total_size / chunk_size;
2505                                 chunk_stride *= chunk_size / val_bytes;
2506                         }
2507
2508                         /* Read bytes that fit into a multiple of chunk_size */
2509                         for (i = 0; i < chunk_count; i++) {
2510                                 ret = regmap_raw_read(map,
2511                                                       reg + (i * chunk_stride),
2512                                                       val + (i * chunk_size),
2513                                                       chunk_size);
2514                                 if (ret != 0)
2515                                         return ret;
2516                         }
2517
2518                         /* Read remaining bytes */
2519                         if (chunk_size * i < total_size) {
2520                                 ret = regmap_raw_read(map,
2521                                                       reg + (i * chunk_stride),
2522                                                       val + (i * chunk_size),
2523                                                       total_size - i * chunk_size);
2524                                 if (ret != 0)
2525                                         return ret;
2526                         }
2527                 }
2528
2529                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
2530                         map->format.parse_inplace(val + i);
2531         } else {
2532                 for (i = 0; i < val_count; i++) {
2533                         unsigned int ival;
2534                         ret = regmap_read(map, reg + (i * map->reg_stride),
2535                                           &ival);
2536                         if (ret != 0)
2537                                 return ret;
2538
2539                         if (map->format.format_val) {
2540                                 map->format.format_val(val + (i * val_bytes), ival, 0);
2541                         } else {
2542                                 /* Devices providing read and write
2543                                  * operations can use the bulk I/O
2544                                  * functions if they define a val_bytes,
2545                                  * we assume that the values are native
2546                                  * endian.
2547                                  */
2548 #ifdef CONFIG_64BIT
2549                                 u64 *u64 = val;
2550 #endif
2551                                 u32 *u32 = val;
2552                                 u16 *u16 = val;
2553                                 u8 *u8 = val;
2554
2555                                 switch (map->format.val_bytes) {
2556 #ifdef CONFIG_64BIT
2557                                 case 8:
2558                                         u64[i] = ival;
2559                                         break;
2560 #endif
2561                                 case 4:
2562                                         u32[i] = ival;
2563                                         break;
2564                                 case 2:
2565                                         u16[i] = ival;
2566                                         break;
2567                                 case 1:
2568                                         u8[i] = ival;
2569                                         break;
2570                                 default:
2571                                         return -EINVAL;
2572                                 }
2573                         }
2574                 }
2575         }
2576
2577         return 0;
2578 }
2579 EXPORT_SYMBOL_GPL(regmap_bulk_read);
2580
2581 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
2582                                unsigned int mask, unsigned int val,
2583                                bool *change, bool force_write)
2584 {
2585         int ret;
2586         unsigned int tmp, orig;
2587
2588         if (change)
2589                 *change = false;
2590
2591         if (regmap_volatile(map, reg) && map->reg_update_bits) {
2592                 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
2593                 if (ret == 0 && change)
2594                         *change = true;
2595         } else {
2596                 ret = _regmap_read(map, reg, &orig);
2597                 if (ret != 0)
2598                         return ret;
2599
2600                 tmp = orig & ~mask;
2601                 tmp |= val & mask;
2602
2603                 if (force_write || (tmp != orig)) {
2604                         ret = _regmap_write(map, reg, tmp);
2605                         if (ret == 0 && change)
2606                                 *change = true;
2607                 }
2608         }
2609
2610         return ret;
2611 }
2612
2613 /**
2614  * regmap_update_bits_base:
2615  *      Perform a read/modify/write cycle on the
2616  *      register map with change, async, force option
2617  *
2618  * @map: Register map to update
2619  * @reg: Register to update
2620  * @mask: Bitmask to change
2621  * @val: New value for bitmask
2622  * @change: Boolean indicating if a write was done
2623  * @async: Boolean indicating asynchronously
2624  * @force: Boolean indicating use force update
2625  *
2626  * if async was true,
2627  * With most buses the read must be done synchronously so this is most
2628  * useful for devices with a cache which do not need to interact with
2629  * the hardware to determine the current register value.
2630  *
2631  * Returns zero for success, a negative number on error.
2632  */
2633 int regmap_update_bits_base(struct regmap *map, unsigned int reg,
2634                             unsigned int mask, unsigned int val,
2635                             bool *change, bool async, bool force)
2636 {
2637         int ret;
2638
2639         map->lock(map->lock_arg);
2640
2641         map->async = async;
2642
2643         ret = _regmap_update_bits(map, reg, mask, val, change, force);
2644
2645         map->async = false;
2646
2647         map->unlock(map->lock_arg);
2648
2649         return ret;
2650 }
2651 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
2652
2653 void regmap_async_complete_cb(struct regmap_async *async, int ret)
2654 {
2655         struct regmap *map = async->map;
2656         bool wake;
2657
2658         trace_regmap_async_io_complete(map);
2659
2660         spin_lock(&map->async_lock);
2661         list_move(&async->list, &map->async_free);
2662         wake = list_empty(&map->async_list);
2663
2664         if (ret != 0)
2665                 map->async_ret = ret;
2666
2667         spin_unlock(&map->async_lock);
2668
2669         if (wake)
2670                 wake_up(&map->async_waitq);
2671 }
2672 EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
2673
2674 static int regmap_async_is_done(struct regmap *map)
2675 {
2676         unsigned long flags;
2677         int ret;
2678
2679         spin_lock_irqsave(&map->async_lock, flags);
2680         ret = list_empty(&map->async_list);
2681         spin_unlock_irqrestore(&map->async_lock, flags);
2682
2683         return ret;
2684 }
2685
2686 /**
2687  * regmap_async_complete: Ensure all asynchronous I/O has completed.
2688  *
2689  * @map: Map to operate on.
2690  *
2691  * Blocks until any pending asynchronous I/O has completed.  Returns
2692  * an error code for any failed I/O operations.
2693  */
2694 int regmap_async_complete(struct regmap *map)
2695 {
2696         unsigned long flags;
2697         int ret;
2698
2699         /* Nothing to do with no async support */
2700         if (!map->bus || !map->bus->async_write)
2701                 return 0;
2702
2703         trace_regmap_async_complete_start(map);
2704
2705         wait_event(map->async_waitq, regmap_async_is_done(map));
2706
2707         spin_lock_irqsave(&map->async_lock, flags);
2708         ret = map->async_ret;
2709         map->async_ret = 0;
2710         spin_unlock_irqrestore(&map->async_lock, flags);
2711
2712         trace_regmap_async_complete_done(map);
2713
2714         return ret;
2715 }
2716 EXPORT_SYMBOL_GPL(regmap_async_complete);
2717
2718 /**
2719  * regmap_register_patch: Register and apply register updates to be applied
2720  *                        on device initialistion
2721  *
2722  * @map: Register map to apply updates to.
2723  * @regs: Values to update.
2724  * @num_regs: Number of entries in regs.
2725  *
2726  * Register a set of register updates to be applied to the device
2727  * whenever the device registers are synchronised with the cache and
2728  * apply them immediately.  Typically this is used to apply
2729  * corrections to be applied to the device defaults on startup, such
2730  * as the updates some vendors provide to undocumented registers.
2731  *
2732  * The caller must ensure that this function cannot be called
2733  * concurrently with either itself or regcache_sync().
2734  */
2735 int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
2736                           int num_regs)
2737 {
2738         struct reg_sequence *p;
2739         int ret;
2740         bool bypass;
2741
2742         if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
2743             num_regs))
2744                 return 0;
2745
2746         p = krealloc(map->patch,
2747                      sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
2748                      GFP_KERNEL);
2749         if (p) {
2750                 memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
2751                 map->patch = p;
2752                 map->patch_regs += num_regs;
2753         } else {
2754                 return -ENOMEM;
2755         }
2756
2757         map->lock(map->lock_arg);
2758
2759         bypass = map->cache_bypass;
2760
2761         map->cache_bypass = true;
2762         map->async = true;
2763
2764         ret = _regmap_multi_reg_write(map, regs, num_regs);
2765
2766         map->async = false;
2767         map->cache_bypass = bypass;
2768
2769         map->unlock(map->lock_arg);
2770
2771         regmap_async_complete(map);
2772
2773         return ret;
2774 }
2775 EXPORT_SYMBOL_GPL(regmap_register_patch);
2776
2777 /*
2778  * regmap_get_val_bytes(): Report the size of a register value
2779  *
2780  * Report the size of a register value, mainly intended to for use by
2781  * generic infrastructure built on top of regmap.
2782  */
2783 int regmap_get_val_bytes(struct regmap *map)
2784 {
2785         if (map->format.format_write)
2786                 return -EINVAL;
2787
2788         return map->format.val_bytes;
2789 }
2790 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
2791
2792 /**
2793  * regmap_get_max_register(): Report the max register value
2794  *
2795  * Report the max register value, mainly intended to for use by
2796  * generic infrastructure built on top of regmap.
2797  */
2798 int regmap_get_max_register(struct regmap *map)
2799 {
2800         return map->max_register ? map->max_register : -EINVAL;
2801 }
2802 EXPORT_SYMBOL_GPL(regmap_get_max_register);
2803
2804 /**
2805  * regmap_get_reg_stride(): Report the register address stride
2806  *
2807  * Report the register address stride, mainly intended to for use by
2808  * generic infrastructure built on top of regmap.
2809  */
2810 int regmap_get_reg_stride(struct regmap *map)
2811 {
2812         return map->reg_stride;
2813 }
2814 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
2815
2816 int regmap_parse_val(struct regmap *map, const void *buf,
2817                         unsigned int *val)
2818 {
2819         if (!map->format.parse_val)
2820                 return -EINVAL;
2821
2822         *val = map->format.parse_val(buf);
2823
2824         return 0;
2825 }
2826 EXPORT_SYMBOL_GPL(regmap_parse_val);
2827
2828 static int __init regmap_initcall(void)
2829 {
2830         regmap_debugfs_initcall();
2831
2832         return 0;
2833 }
2834 postcore_initcall(regmap_initcall);