drivers/mtd/nand/spi/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2016-2017 Micron Technology, Inc.
   4  *
   5  * Authors:
   6  *      Peter Pan <peterpandong@micron.com>
   7  *      Boris Brezillon <boris.brezillon@bootlin.com>
   8  */
   9
  10 #define pr_fmt(fmt)     "spi-nand: " fmt
  11
  12 #include <linux/device.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/mtd/spinand.h>
  17 #include <linux/of.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/spi/spi-mem.h>
  22
  23 static int spinand_read_reg_op(struct spinand_device *spinand, u8 reg, u8 *val)
  24 {
  25         struct spi_mem_op op = SPINAND_GET_FEATURE_OP(reg,
  26                                                       spinand->scratchbuf);
  27         int ret;
  28
  29         ret = spi_mem_exec_op(spinand->spimem, &op);
  30         if (ret)
  31                 return ret;
  32
  33         *val = *spinand->scratchbuf;
  34         return 0;
  35 }
  36
  37 static int spinand_write_reg_op(struct spinand_device *spinand, u8 reg, u8 val)
  38 {
  39         struct spi_mem_op op = SPINAND_SET_FEATURE_OP(reg,
  40                                                       spinand->scratchbuf);
  41
  42         *spinand->scratchbuf = val;
  43         return spi_mem_exec_op(spinand->spimem, &op);
  44 }
  45
  46 static int spinand_read_status(struct spinand_device *spinand, u8 *status)
  47 {
  48         return spinand_read_reg_op(spinand, REG_STATUS, status);
  49 }
  50
  51 static int spinand_get_cfg(struct spinand_device *spinand, u8 *cfg)
  52 {
  53         struct nand_device *nand = spinand_to_nand(spinand);
  54
  55         if (WARN_ON(spinand->cur_target < 0 ||
  56                     spinand->cur_target >= nand->memorg.ntargets))
  57                 return -EINVAL;
  58
  59         *cfg = spinand->cfg_cache[spinand->cur_target];
  60         return 0;
  61 }
  62
  63 static int spinand_set_cfg(struct spinand_device *spinand, u8 cfg)
  64 {
  65         struct nand_device *nand = spinand_to_nand(spinand);
  66         int ret;
  67
  68         if (WARN_ON(spinand->cur_target < 0 ||
  69                     spinand->cur_target >= nand->memorg.ntargets))
  70                 return -EINVAL;
  71
  72         if (spinand->cfg_cache[spinand->cur_target] == cfg)
  73                 return 0;
  74
  75         ret = spinand_write_reg_op(spinand, REG_CFG, cfg);
  76         if (ret)
  77                 return ret;
  78
  79         spinand->cfg_cache[spinand->cur_target] = cfg;
  80         return 0;
  81 }
  82
  83 /**
  84  * spinand_upd_cfg() - Update the configuration register
  85  * @spinand: the spinand device
  86  * @mask: the mask encoding the bits to update in the config reg
  87  * @val: the new value to apply
  88  *
  89  * Update the configuration register.
  90  *
  91  * Return: 0 on success, a negative error code otherwise.
  92  */
  93 int spinand_upd_cfg(struct spinand_device *spinand, u8 mask, u8 val)
  94 {
  95         int ret;
  96         u8 cfg;
  97
  98         ret = spinand_get_cfg(spinand, &cfg);
  99         if (ret)
 100                 return ret;
 101
 102         cfg &= ~mask;
 103         cfg |= val;
 104
 105         return spinand_set_cfg(spinand, cfg);
 106 }
 107
 108 /**
 109  * spinand_select_target() - Select a specific NAND target/die
 110  * @spinand: the spinand device
 111  * @target: the target/die to select
 112  *
 113  * Select a new target/die. If chip only has one die, this function is a NOOP.
 114  *
 115  * Return: 0 on success, a negative error code otherwise.
 116  */
 117 int spinand_select_target(struct spinand_device *spinand, unsigned int target)
 118 {
 119         struct nand_device *nand = spinand_to_nand(spinand);
 120         int ret;
 121
 122         if (WARN_ON(target >= nand->memorg.ntargets))
 123                 return -EINVAL;
 124
 125         if (spinand->cur_target == target)
 126                 return 0;
 127
 128         if (nand->memorg.ntargets == 1) {
 129                 spinand->cur_target = target;
 130                 return 0;
 131         }
 132
 133         ret = spinand->select_target(spinand, target);
 134         if (ret)
 135                 return ret;
 136
 137         spinand->cur_target = target;
 138         return 0;
 139 }
 140
 141 static int spinand_read_cfg(struct spinand_device *spinand)
 142 {
 143         struct nand_device *nand = spinand_to_nand(spinand);
 144         unsigned int target;
 145         int ret;
 146
 147         for (target = 0; target < nand->memorg.ntargets; target++) {
 148                 ret = spinand_select_target(spinand, target);
 149                 if (ret)
 150                         return ret;
 151
 152                 /*
 153                  * We use spinand_read_reg_op() instead of spinand_get_cfg()
 154                  * here to bypass the config cache.
 155                  */
 156                 ret = spinand_read_reg_op(spinand, REG_CFG,
 157                                           &spinand->cfg_cache[target]);
 158                 if (ret)
 159                         return ret;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int spinand_init_cfg_cache(struct spinand_device *spinand)
 166 {
 167         struct nand_device *nand = spinand_to_nand(spinand);
 168         struct device *dev = &spinand->spimem->spi->dev;
 169
 170         spinand->cfg_cache = devm_kcalloc(dev,
 171                                           nand->memorg.ntargets,
 172                                           sizeof(*spinand->cfg_cache),
 173                                           GFP_KERNEL);
 174         if (!spinand->cfg_cache)
 175                 return -ENOMEM;
 176
 177         return 0;
 178 }
 179
 180 static int spinand_init_quad_enable(struct spinand_device *spinand)
 181 {
 182         bool enable = false;
 183
 184         if (!(spinand->flags & SPINAND_HAS_QE_BIT))
 185                 return 0;
 186
 187         if (spinand->op_templates.read_cache->data.buswidth == 4 ||
 188             spinand->op_templates.write_cache->data.buswidth == 4 ||
 189             spinand->op_templates.update_cache->data.buswidth == 4)
 190                 enable = true;
 191
 192         return spinand_upd_cfg(spinand, CFG_QUAD_ENABLE,
 193                                enable ? CFG_QUAD_ENABLE : 0);
 194 }
 195
 196 static int spinand_ecc_enable(struct spinand_device *spinand,
 197                               bool enable)
 198 {
 199         return spinand_upd_cfg(spinand, CFG_ECC_ENABLE,
 200                                enable ? CFG_ECC_ENABLE : 0);
 201 }
 202
 203 static int spinand_check_ecc_status(struct spinand_device *spinand, u8 status)
 204 {
 205         struct nand_device *nand = spinand_to_nand(spinand);
 206
 207         if (spinand->eccinfo.get_status)
 208                 return spinand->eccinfo.get_status(spinand, status);
 209
 210         switch (status & STATUS_ECC_MASK) {
 211         case STATUS_ECC_NO_BITFLIPS:
 212                 return 0;
 213
 214         case STATUS_ECC_HAS_BITFLIPS:
 215                 /*
 216                  * We have no way to know exactly how many bitflips have been
 217                  * fixed, so let's return the maximum possible value so that
 218                  * wear-leveling layers move the data immediately.
 219                  */
 220                 return nanddev_get_ecc_conf(nand)->strength;
 221
 222         case STATUS_ECC_UNCOR_ERROR:
 223                 return -EBADMSG;
 224
 225         default:
 226                 break;
 227         }
 228
 229         return -EINVAL;
 230 }
 231
 232 static int spinand_noecc_ooblayout_ecc(struct mtd_info *mtd, int section,
 233                                        struct mtd_oob_region *region)
 234 {
 235         return -ERANGE;
 236 }
 237
 238 static int spinand_noecc_ooblayout_free(struct mtd_info *mtd, int section,
 239                                         struct mtd_oob_region *region)
 240 {
 241         if (section)
 242                 return -ERANGE;
 243
 244         /* Reserve 2 bytes for the BBM. */
 245         region->offset = 2;
 246         region->length = 62;
 247
 248         return 0;
 249 }
 250
 251 static const struct mtd_ooblayout_ops spinand_noecc_ooblayout = {
 252         .ecc = spinand_noecc_ooblayout_ecc,
 253         .free = spinand_noecc_ooblayout_free,
 254 };
 255
 256 static int spinand_ondie_ecc_init_ctx(struct nand_device *nand)
 257 {
 258         struct spinand_device *spinand = nand_to_spinand(nand);
 259         struct mtd_info *mtd = nanddev_to_mtd(nand);
 260         struct spinand_ondie_ecc_conf *engine_conf;
 261
 262         nand->ecc.ctx.conf.engine_type = NAND_ECC_ENGINE_TYPE_ON_DIE;
 263         nand->ecc.ctx.conf.step_size = nand->ecc.requirements.step_size;
 264         nand->ecc.ctx.conf.strength = nand->ecc.requirements.strength;
 265
 266         engine_conf = kzalloc(sizeof(*engine_conf), GFP_KERNEL);
 267         if (!engine_conf)
 268                 return -ENOMEM;
 269
 270         nand->ecc.ctx.priv = engine_conf;
 271
 272         if (spinand->eccinfo.ooblayout)
 273                 mtd_set_ooblayout(mtd, spinand->eccinfo.ooblayout);
 274         else
 275                 mtd_set_ooblayout(mtd, &spinand_noecc_ooblayout);
 276
 277         return 0;
 278 }
 279
 280 static void spinand_ondie_ecc_cleanup_ctx(struct nand_device *nand)
 281 {
 282         kfree(nand->ecc.ctx.priv);
 283 }
 284
 285 static int spinand_ondie_ecc_prepare_io_req(struct nand_device *nand,
 286                                             struct nand_page_io_req *req)
 287 {
 288         struct spinand_device *spinand = nand_to_spinand(nand);
 289         bool enable = (req->mode != MTD_OPS_RAW);
 290
 291         memset(spinand->oobbuf, 0xff, nanddev_per_page_oobsize(nand));
 292
 293         /* Only enable or disable the engine */
 294         return spinand_ecc_enable(spinand, enable);
 295 }
 296
 297 static int spinand_ondie_ecc_finish_io_req(struct nand_device *nand,
 298                                            struct nand_page_io_req *req)
 299 {
 300         struct spinand_ondie_ecc_conf *engine_conf = nand->ecc.ctx.priv;
 301         struct spinand_device *spinand = nand_to_spinand(nand);
 302         struct mtd_info *mtd = spinand_to_mtd(spinand);
 303         int ret;
 304
 305         if (req->mode == MTD_OPS_RAW)
 306                 return 0;
 307
 308         /* Nothing to do when finishing a page write */
 309         if (req->type == NAND_PAGE_WRITE)
 310                 return 0;
 311
 312         /* Finish a page read: check the status, report errors/bitflips */
 313         ret = spinand_check_ecc_status(spinand, engine_conf->status);
 314         if (ret == -EBADMSG)
 315                 mtd->ecc_stats.failed++;
 316         else if (ret > 0)
 317                 mtd->ecc_stats.corrected += ret;
 318
 319         return ret;
 320 }
 321
 322 static struct nand_ecc_engine_ops spinand_ondie_ecc_engine_ops = {
 323         .init_ctx = spinand_ondie_ecc_init_ctx,
 324         .cleanup_ctx = spinand_ondie_ecc_cleanup_ctx,
 325         .prepare_io_req = spinand_ondie_ecc_prepare_io_req,
 326         .finish_io_req = spinand_ondie_ecc_finish_io_req,
 327 };
 328
 329 static struct nand_ecc_engine spinand_ondie_ecc_engine = {
 330         .ops = &spinand_ondie_ecc_engine_ops,
 331 };
 332
 333 static void spinand_ondie_ecc_save_status(struct nand_device *nand, u8 status)
 334 {
 335         struct spinand_ondie_ecc_conf *engine_conf = nand->ecc.ctx.priv;
 336
 337         if (nand->ecc.ctx.conf.engine_type == NAND_ECC_ENGINE_TYPE_ON_DIE &&
 338             engine_conf)
 339                 engine_conf->status = status;
 340 }
 341
 342 static int spinand_write_enable_op(struct spinand_device *spinand)
 343 {
 344         struct spi_mem_op op = SPINAND_WR_EN_DIS_OP(true);
 345
 346         return spi_mem_exec_op(spinand->spimem, &op);
 347 }
 348
 349 static int spinand_load_page_op(struct spinand_device *spinand,
 350                                 const struct nand_page_io_req *req)
 351 {
 352         struct nand_device *nand = spinand_to_nand(spinand);
 353         unsigned int row = nanddev_pos_to_row(nand, &req->pos);
 354         struct spi_mem_op op = SPINAND_PAGE_READ_OP(row);
 355
 356         return spi_mem_exec_op(spinand->spimem, &op);
 357 }
 358
 359 static int spinand_read_from_cache_op(struct spinand_device *spinand,
 360                                       const struct nand_page_io_req *req)
 361 {
 362         struct nand_device *nand = spinand_to_nand(spinand);
 363         struct mtd_info *mtd = spinand_to_mtd(spinand);
 364         struct spi_mem_dirmap_desc *rdesc;
 365         unsigned int nbytes = 0;
 366         void *buf = NULL;
 367         u16 column = 0;
 368         ssize_t ret;
 369
 370         if (req->datalen) {
 371                 buf = spinand->databuf;
 372                 nbytes = nanddev_page_size(nand);
 373                 column = 0;
 374         }
 375
 376         if (req->ooblen) {
 377                 nbytes += nanddev_per_page_oobsize(nand);
 378                 if (!buf) {
 379                         buf = spinand->oobbuf;
 380                         column = nanddev_page_size(nand);
 381                 }
 382         }
 383
 384         if (req->mode == MTD_OPS_RAW)
 385                 rdesc = spinand->dirmaps[req->pos.plane].rdesc;
 386         else
 387                 rdesc = spinand->dirmaps[req->pos.plane].rdesc_ecc;
 388
 389         while (nbytes) {
 390                 ret = spi_mem_dirmap_read(rdesc, column, nbytes, buf);
 391                 if (ret < 0)
 392                         return ret;
 393
 394                 if (!ret || ret > nbytes)
 395                         return -EIO;
 396
 397                 nbytes -= ret;
 398                 column += ret;
 399                 buf += ret;
 400         }
 401
 402         if (req->datalen)
 403                 memcpy(req->databuf.in, spinand->databuf + req->dataoffs,
 404                        req->datalen);
 405
 406         if (req->ooblen) {
 407                 if (req->mode == MTD_OPS_AUTO_OOB)
 408                         mtd_ooblayout_get_databytes(mtd, req->oobbuf.in,
 409                                                     spinand->oobbuf,
 410                                                     req->ooboffs,
 411                                                     req->ooblen);
 412                 else
 413                         memcpy(req->oobbuf.in, spinand->oobbuf + req->ooboffs,
 414                                req->ooblen);
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int spinand_write_to_cache_op(struct spinand_device *spinand,
 421                                      const struct nand_page_io_req *req)
 422 {
 423         struct nand_device *nand = spinand_to_nand(spinand);
 424         struct mtd_info *mtd = spinand_to_mtd(spinand);
 425         struct spi_mem_dirmap_desc *wdesc;
 426         unsigned int nbytes, column = 0;
 427         void *buf = spinand->databuf;
 428         ssize_t ret;
 429
 430         /*
 431          * Looks like PROGRAM LOAD (AKA write cache) does not necessarily reset
 432          * the cache content to 0xFF (depends on vendor implementation), so we
 433          * must fill the page cache entirely even if we only want to program
 434          * the data portion of the page, otherwise we might corrupt the BBM or
 435          * user data previously programmed in OOB area.
 436          *
 437          * Only reset the data buffer manually, the OOB buffer is prepared by
 438          * ECC engines ->prepare_io_req() callback.
 439          */
 440         nbytes = nanddev_page_size(nand) + nanddev_per_page_oobsize(nand);
 441         memset(spinand->databuf, 0xff, nanddev_page_size(nand));
 442
 443         if (req->datalen)
 444                 memcpy(spinand->databuf + req->dataoffs, req->databuf.out,
 445                        req->datalen);
 446
 447         if (req->ooblen) {
 448                 if (req->mode == MTD_OPS_AUTO_OOB)
 449                         mtd_ooblayout_set_databytes(mtd, req->oobbuf.out,
 450                                                     spinand->oobbuf,
 451                                                     req->ooboffs,
 452                                                     req->ooblen);
 453                 else
 454                         memcpy(spinand->oobbuf + req->ooboffs, req->oobbuf.out,
 455                                req->ooblen);
 456         }
 457
 458         if (req->mode == MTD_OPS_RAW)
 459                 wdesc = spinand->dirmaps[req->pos.plane].wdesc;
 460         else
 461                 wdesc = spinand->dirmaps[req->pos.plane].wdesc_ecc;
 462
 463         while (nbytes) {
 464                 ret = spi_mem_dirmap_write(wdesc, column, nbytes, buf);
 465                 if (ret < 0)
 466                         return ret;
 467
 468                 if (!ret || ret > nbytes)
 469                         return -EIO;
 470
 471                 nbytes -= ret;
 472                 column += ret;
 473                 buf += ret;
 474         }
 475
 476         return 0;
 477 }
 478
 479 static int spinand_program_op(struct spinand_device *spinand,
 480                               const struct nand_page_io_req *req)
 481 {
 482         struct nand_device *nand = spinand_to_nand(spinand);
 483         unsigned int row = nanddev_pos_to_row(nand, &req->pos);
 484         struct spi_mem_op op = SPINAND_PROG_EXEC_OP(row);
 485
 486         return spi_mem_exec_op(spinand->spimem, &op);
 487 }
 488
 489 static int spinand_erase_op(struct spinand_device *spinand,
 490                             const struct nand_pos *pos)
 491 {
 492         struct nand_device *nand = spinand_to_nand(spinand);
 493         unsigned int row = nanddev_pos_to_row(nand, pos);
 494         struct spi_mem_op op = SPINAND_BLK_ERASE_OP(row);
 495
 496         return spi_mem_exec_op(spinand->spimem, &op);
 497 }
 498
 499 static int spinand_wait(struct spinand_device *spinand,
 500                         unsigned long initial_delay_us,
 501                         unsigned long poll_delay_us,
 502                         u8 *s)
 503 {
 504         struct spi_mem_op op = SPINAND_GET_FEATURE_OP(REG_STATUS,
 505                                                       spinand->scratchbuf);
 506         u8 status;
 507         int ret;
 508
 509         ret = spi_mem_poll_status(spinand->spimem, &op, STATUS_BUSY, 0,
 510                                   initial_delay_us,
 511                                   poll_delay_us,
 512                                   SPINAND_WAITRDY_TIMEOUT_MS);
 513         if (ret)
 514                 return ret;
 515
 516         status = *spinand->scratchbuf;
 517         if (!(status & STATUS_BUSY))
 518                 goto out;
 519
 520         /*
 521          * Extra read, just in case the STATUS_READY bit has changed
 522          * since our last check
 523          */
 524         ret = spinand_read_status(spinand, &status);
 525         if (ret)
 526                 return ret;
 527
 528 out:
 529         if (s)
 530                 *s = status;
 531
 532         return status & STATUS_BUSY ? -ETIMEDOUT : 0;
 533 }
 534
 535 static int spinand_read_id_op(struct spinand_device *spinand, u8 naddr,
 536                               u8 ndummy, u8 *buf)
 537 {
 538         struct spi_mem_op op = SPINAND_READID_OP(
 539                 naddr, ndummy, spinand->scratchbuf, SPINAND_MAX_ID_LEN);
 540         int ret;
 541
 542         ret = spi_mem_exec_op(spinand->spimem, &op);
 543         if (!ret)
 544                 memcpy(buf, spinand->scratchbuf, SPINAND_MAX_ID_LEN);
 545
 546         return ret;
 547 }
 548
 549 static int spinand_reset_op(struct spinand_device *spinand)
 550 {
 551         struct spi_mem_op op = SPINAND_RESET_OP;
 552         int ret;
 553
 554         ret = spi_mem_exec_op(spinand->spimem, &op);
 555         if (ret)
 556                 return ret;
 557
 558         return spinand_wait(spinand,
 559                             SPINAND_RESET_INITIAL_DELAY_US,
 560                             SPINAND_RESET_POLL_DELAY_US,
 561                             NULL);
 562 }
 563
 564 static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
 565 {
 566         return spinand_write_reg_op(spinand, REG_BLOCK_LOCK, lock);
 567 }
 568
 569 static int spinand_read_page(struct spinand_device *spinand,
 570                              const struct nand_page_io_req *req)
 571 {
 572         struct nand_device *nand = spinand_to_nand(spinand);
 573         u8 status;
 574         int ret;
 575
 576         ret = nand_ecc_prepare_io_req(nand, (struct nand_page_io_req *)req);
 577         if (ret)
 578                 return ret;
 579
 580         ret = spinand_load_page_op(spinand, req);
 581         if (ret)
 582                 return ret;
 583
 584         ret = spinand_wait(spinand,
 585                            SPINAND_READ_INITIAL_DELAY_US,
 586                            SPINAND_READ_POLL_DELAY_US,
 587                            &status);
 588         if (ret < 0)
 589                 return ret;
 590
 591         spinand_ondie_ecc_save_status(nand, status);
 592
 593         ret = spinand_read_from_cache_op(spinand, req);
 594         if (ret)
 595                 return ret;
 596
 597         return nand_ecc_finish_io_req(nand, (struct nand_page_io_req *)req);
 598 }
 599
 600 static int spinand_write_page(struct spinand_device *spinand,
 601                               const struct nand_page_io_req *req)
 602 {
 603         struct nand_device *nand = spinand_to_nand(spinand);
 604         u8 status;
 605         int ret;
 606
 607         ret = nand_ecc_prepare_io_req(nand, (struct nand_page_io_req *)req);
 608         if (ret)
 609                 return ret;
 610
 611         ret = spinand_write_enable_op(spinand);
 612         if (ret)
 613                 return ret;
 614
 615         ret = spinand_write_to_cache_op(spinand, req);
 616         if (ret)
 617                 return ret;
 618
 619         ret = spinand_program_op(spinand, req);
 620         if (ret)
 621                 return ret;
 622
 623         ret = spinand_wait(spinand,
 624                            SPINAND_WRITE_INITIAL_DELAY_US,
 625                            SPINAND_WRITE_POLL_DELAY_US,
 626                            &status);
 627         if (!ret && (status & STATUS_PROG_FAILED))
 628                 return -EIO;
 629
 630         return nand_ecc_finish_io_req(nand, (struct nand_page_io_req *)req);
 631 }
 632
 633 static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
 634                             struct mtd_oob_ops *ops)
 635 {
 636         struct spinand_device *spinand = mtd_to_spinand(mtd);
 637         struct nand_device *nand = mtd_to_nanddev(mtd);
 638         unsigned int max_bitflips = 0;
 639         struct nand_io_iter iter;
 640         bool disable_ecc = false;
 641         bool ecc_failed = false;
 642         int ret = 0;
 643
 644         if (ops->mode == MTD_OPS_RAW || !spinand->eccinfo.ooblayout)
 645                 disable_ecc = true;
 646
 647         mutex_lock(&spinand->lock);
 648
 649         nanddev_io_for_each_page(nand, NAND_PAGE_READ, from, ops, &iter) {
 650                 if (disable_ecc)
 651                         iter.req.mode = MTD_OPS_RAW;
 652
 653                 ret = spinand_select_target(spinand, iter.req.pos.target);
 654                 if (ret)
 655                         break;
 656
 657                 ret = spinand_read_page(spinand, &iter.req);
 658                 if (ret < 0 && ret != -EBADMSG)
 659                         break;
 660
 661                 if (ret == -EBADMSG)
 662                         ecc_failed = true;
 663                 else
 664                         max_bitflips = max_t(unsigned int, max_bitflips, ret);
 665
 666                 ret = 0;
 667                 ops->retlen += iter.req.datalen;
 668                 ops->oobretlen += iter.req.ooblen;
 669         }
 670
 671         mutex_unlock(&spinand->lock);
 672
 673         if (ecc_failed && !ret)
 674                 ret = -EBADMSG;
 675
 676         return ret ? ret : max_bitflips;
 677 }
 678
 679 static int spinand_mtd_write(struct mtd_info *mtd, loff_t to,
 680                              struct mtd_oob_ops *ops)
 681 {
 682         struct spinand_device *spinand = mtd_to_spinand(mtd);
 683         struct nand_device *nand = mtd_to_nanddev(mtd);
 684         struct nand_io_iter iter;
 685         bool disable_ecc = false;
 686         int ret = 0;
 687
 688         if (ops->mode == MTD_OPS_RAW || !mtd->ooblayout)
 689                 disable_ecc = true;
 690
 691         mutex_lock(&spinand->lock);
 692
 693         nanddev_io_for_each_page(nand, NAND_PAGE_WRITE, to, ops, &iter) {
 694                 if (disable_ecc)
 695                         iter.req.mode = MTD_OPS_RAW;
 696
 697                 ret = spinand_select_target(spinand, iter.req.pos.target);
 698                 if (ret)
 699                         break;
 700
 701                 ret = spinand_write_page(spinand, &iter.req);
 702                 if (ret)
 703                         break;
 704
 705                 ops->retlen += iter.req.datalen;
 706                 ops->oobretlen += iter.req.ooblen;
 707         }
 708
 709         mutex_unlock(&spinand->lock);
 710
 711         return ret;
 712 }
 713
 714 static bool spinand_isbad(struct nand_device *nand, const struct nand_pos *pos)
 715 {
 716         struct spinand_device *spinand = nand_to_spinand(nand);
 717         u8 marker[2] = { };
 718         struct nand_page_io_req req = {
 719                 .pos = *pos,
 720                 .ooblen = sizeof(marker),
 721                 .ooboffs = 0,
 722                 .oobbuf.in = marker,
 723                 .mode = MTD_OPS_RAW,
 724         };
 725
 726         spinand_select_target(spinand, pos->target);
 727         spinand_read_page(spinand, &req);
 728         if (marker[0] != 0xff || marker[1] != 0xff)
 729                 return true;
 730
 731         return false;
 732 }
 733
 734 static int spinand_mtd_block_isbad(struct mtd_info *mtd, loff_t offs)
 735 {
 736         struct nand_device *nand = mtd_to_nanddev(mtd);
 737         struct spinand_device *spinand = nand_to_spinand(nand);
 738         struct nand_pos pos;
 739         int ret;
 740
 741         nanddev_offs_to_pos(nand, offs, &pos);
 742         mutex_lock(&spinand->lock);
 743         ret = nanddev_isbad(nand, &pos);
 744         mutex_unlock(&spinand->lock);
 745
 746         return ret;
 747 }
 748
 749 static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
 750 {
 751         struct spinand_device *spinand = nand_to_spinand(nand);
 752         u8 marker[2] = { };
 753         struct nand_page_io_req req = {
 754                 .pos = *pos,
 755                 .ooboffs = 0,
 756                 .ooblen = sizeof(marker),
 757                 .oobbuf.out = marker,
 758                 .mode = MTD_OPS_RAW,
 759         };
 760         int ret;
 761
 762         ret = spinand_select_target(spinand, pos->target);
 763         if (ret)
 764                 return ret;
 765
 766         ret = spinand_write_enable_op(spinand);
 767         if (ret)
 768                 return ret;
 769
 770         return spinand_write_page(spinand, &req);
 771 }
 772
 773 static int spinand_mtd_block_markbad(struct mtd_info *mtd, loff_t offs)
 774 {
 775         struct nand_device *nand = mtd_to_nanddev(mtd);
 776         struct spinand_device *spinand = nand_to_spinand(nand);
 777         struct nand_pos pos;
 778         int ret;
 779
 780         nanddev_offs_to_pos(nand, offs, &pos);
 781         mutex_lock(&spinand->lock);
 782         ret = nanddev_markbad(nand, &pos);
 783         mutex_unlock(&spinand->lock);
 784
 785         return ret;
 786 }
 787
 788 static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
 789 {
 790         struct spinand_device *spinand = nand_to_spinand(nand);
 791         u8 status;
 792         int ret;
 793
 794         ret = spinand_select_target(spinand, pos->target);
 795         if (ret)
 796                 return ret;
 797
 798         ret = spinand_write_enable_op(spinand);
 799         if (ret)
 800                 return ret;
 801
 802         ret = spinand_erase_op(spinand, pos);
 803         if (ret)
 804                 return ret;
 805
 806         ret = spinand_wait(spinand,
 807                            SPINAND_ERASE_INITIAL_DELAY_US,
 808                            SPINAND_ERASE_POLL_DELAY_US,
 809                            &status);
 810
 811         if (!ret && (status & STATUS_ERASE_FAILED))
 812                 ret = -EIO;
 813
 814         return ret;
 815 }
 816
 817 static int spinand_mtd_erase(struct mtd_info *mtd,
 818                              struct erase_info *einfo)
 819 {
 820         struct spinand_device *spinand = mtd_to_spinand(mtd);
 821         int ret;
 822
 823         mutex_lock(&spinand->lock);
 824         ret = nanddev_mtd_erase(mtd, einfo);
 825         mutex_unlock(&spinand->lock);
 826
 827         return ret;
 828 }
 829
 830 static int spinand_mtd_block_isreserved(struct mtd_info *mtd, loff_t offs)
 831 {
 832         struct spinand_device *spinand = mtd_to_spinand(mtd);
 833         struct nand_device *nand = mtd_to_nanddev(mtd);
 834         struct nand_pos pos;
 835         int ret;
 836
 837         nanddev_offs_to_pos(nand, offs, &pos);
 838         mutex_lock(&spinand->lock);
 839         ret = nanddev_isreserved(nand, &pos);
 840         mutex_unlock(&spinand->lock);
 841
 842         return ret;
 843 }
 844
 845 static int spinand_create_dirmap(struct spinand_device *spinand,
 846                                  unsigned int plane)
 847 {
 848         struct nand_device *nand = spinand_to_nand(spinand);
 849         struct spi_mem_dirmap_info info = {
 850                 .length = nanddev_page_size(nand) +
 851                           nanddev_per_page_oobsize(nand),
 852         };
 853         struct spi_mem_dirmap_desc *desc;
 854
 855         /* The plane number is passed in MSB just above the column address */
 856         info.offset = plane << fls(nand->memorg.pagesize);
 857
 858         info.op_tmpl = *spinand->op_templates.update_cache;
 859         desc = devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev,
 860                                           spinand->spimem, &info);
 861         if (IS_ERR(desc))
 862                 return PTR_ERR(desc);
 863
 864         spinand->dirmaps[plane].wdesc = desc;
 865
 866         info.op_tmpl = *spinand->op_templates.read_cache;
 867         desc = devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev,
 868                                           spinand->spimem, &info);
 869         if (IS_ERR(desc))
 870                 return PTR_ERR(desc);
 871
 872         spinand->dirmaps[plane].rdesc = desc;
 873
 874         if (nand->ecc.engine->integration != NAND_ECC_ENGINE_INTEGRATION_PIPELINED) {
 875                 spinand->dirmaps[plane].wdesc_ecc = spinand->dirmaps[plane].wdesc;
 876                 spinand->dirmaps[plane].rdesc_ecc = spinand->dirmaps[plane].rdesc;
 877
 878                 return 0;
 879         }
 880
 881         info.op_tmpl = *spinand->op_templates.update_cache;
 882         info.op_tmpl.data.ecc = true;
 883         desc = devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev,
 884                                           spinand->spimem, &info);
 885         if (IS_ERR(desc))
 886                 return PTR_ERR(desc);
 887
 888         spinand->dirmaps[plane].wdesc_ecc = desc;
 889
 890         info.op_tmpl = *spinand->op_templates.read_cache;
 891         info.op_tmpl.data.ecc = true;
 892         desc = devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev,
 893                                           spinand->spimem, &info);
 894         if (IS_ERR(desc))
 895                 return PTR_ERR(desc);
 896
 897         spinand->dirmaps[plane].rdesc_ecc = desc;
 898
 899         return 0;
 900 }
 901
 902 static int spinand_create_dirmaps(struct spinand_device *spinand)
 903 {
 904         struct nand_device *nand = spinand_to_nand(spinand);
 905         int i, ret;
 906
 907         spinand->dirmaps = devm_kzalloc(&spinand->spimem->spi->dev,
 908                                         sizeof(*spinand->dirmaps) *
 909                                         nand->memorg.planes_per_lun,
 910                                         GFP_KERNEL);
 911         if (!spinand->dirmaps)
 912                 return -ENOMEM;
 913
 914         for (i = 0; i < nand->memorg.planes_per_lun; i++) {
 915                 ret = spinand_create_dirmap(spinand, i);
 916                 if (ret)
 917                         return ret;
 918         }
 919
 920         return 0;
 921 }
 922
 923 static const struct nand_ops spinand_ops = {
 924         .erase = spinand_erase,
 925         .markbad = spinand_markbad,
 926         .isbad = spinand_isbad,
 927 };
 928
 929 static const struct spinand_manufacturer *spinand_manufacturers[] = {
 930         &gigadevice_spinand_manufacturer,
 931         &macronix_spinand_manufacturer,
 932         &micron_spinand_manufacturer,
 933         &paragon_spinand_manufacturer,
 934         &toshiba_spinand_manufacturer,
 935         &winbond_spinand_manufacturer,
 936         &xtx_spinand_manufacturer,
 937 };
 938
 939 static int spinand_manufacturer_match(struct spinand_device *spinand,
 940                                       enum spinand_readid_method rdid_method)
 941 {
 942         u8 *id = spinand->id.data;
 943         unsigned int i;
 944         int ret;
 945
 946         for (i = 0; i < ARRAY_SIZE(spinand_manufacturers); i++) {
 947                 const struct spinand_manufacturer *manufacturer =
 948                         spinand_manufacturers[i];
 949
 950                 if (id[0] != manufacturer->id)
 951                         continue;
 952
 953                 ret = spinand_match_and_init(spinand,
 954                                              manufacturer->chips,
 955                                              manufacturer->nchips,
 956                                              rdid_method);
 957                 if (ret < 0)
 958                         continue;
 959
 960                 spinand->manufacturer = manufacturer;
 961                 return 0;
 962         }
 963         return -ENOTSUPP;
 964 }
 965
 966 static int spinand_id_detect(struct spinand_device *spinand)
 967 {
 968         u8 *id = spinand->id.data;
 969         int ret;
 970
 971         ret = spinand_read_id_op(spinand, 0, 0, id);
 972         if (ret)
 973                 return ret;
 974         ret = spinand_manufacturer_match(spinand, SPINAND_READID_METHOD_OPCODE);
 975         if (!ret)
 976                 return 0;
 977
 978         ret = spinand_read_id_op(spinand, 1, 0, id);
 979         if (ret)
 980                 return ret;
 981         ret = spinand_manufacturer_match(spinand,
 982                                          SPINAND_READID_METHOD_OPCODE_ADDR);
 983         if (!ret)
 984                 return 0;
 985
 986         ret = spinand_read_id_op(spinand, 0, 1, id);
 987         if (ret)
 988                 return ret;
 989         ret = spinand_manufacturer_match(spinand,
 990                                          SPINAND_READID_METHOD_OPCODE_DUMMY);
 991
 992         return ret;
 993 }
 994
 995 static int spinand_manufacturer_init(struct spinand_device *spinand)
 996 {
 997         if (spinand->manufacturer->ops->init)
 998                 return spinand->manufacturer->ops->init(spinand);
 999
1000         return 0;
1001 }
1002
1003 static void spinand_manufacturer_cleanup(struct spinand_device *spinand)
1004 {
1005         /* Release manufacturer private data */
1006         if (spinand->manufacturer->ops->cleanup)
1007                 return spinand->manufacturer->ops->cleanup(spinand);
1008 }
1009
1010 static const struct spi_mem_op *
1011 spinand_select_op_variant(struct spinand_device *spinand,
1012                           const struct spinand_op_variants *variants)
1013 {
1014         struct nand_device *nand = spinand_to_nand(spinand);
1015         unsigned int i;
1016
1017         for (i = 0; i < variants->nops; i++) {
1018                 struct spi_mem_op op = variants->ops[i];
1019                 unsigned int nbytes;
1020                 int ret;
1021
1022                 nbytes = nanddev_per_page_oobsize(nand) +
1023                          nanddev_page_size(nand);
1024
1025                 while (nbytes) {
1026                         op.data.nbytes = nbytes;
1027                         ret = spi_mem_adjust_op_size(spinand->spimem, &op);
1028                         if (ret)
1029                                 break;
1030
1031                         if (!spi_mem_supports_op(spinand->spimem, &op))
1032                                 break;
1033
1034                         nbytes -= op.data.nbytes;
1035                 }
1036
1037                 if (!nbytes)
1038                         return &variants->ops[i];
1039         }
1040
1041         return NULL;
1042 }
1043
1044 /**
1045  * spinand_match_and_init() - Try to find a match between a device ID and an
1046  *                            entry in a spinand_info table
1047  * @spinand: SPI NAND object
1048  * @table: SPI NAND device description table
1049  * @table_size: size of the device description table
1050  * @rdid_method: read id method to match
1051  *
1052  * Match between a device ID retrieved through the READ_ID command and an
1053  * entry in the SPI NAND description table. If a match is found, the spinand
1054  * object will be initialized with information provided by the matching
1055  * spinand_info entry.
1056  *
1057  * Return: 0 on success, a negative error code otherwise.
1058  */
1059 int spinand_match_and_init(struct spinand_device *spinand,
1060                            const struct spinand_info *table,
1061                            unsigned int table_size,
1062                            enum spinand_readid_method rdid_method)
1063 {
1064         u8 *id = spinand->id.data;
1065         struct nand_device *nand = spinand_to_nand(spinand);
1066         unsigned int i;
1067
1068         for (i = 0; i < table_size; i++) {
1069                 const struct spinand_info *info = &table[i];
1070                 const struct spi_mem_op *op;
1071
1072                 if (rdid_method != info->devid.method)
1073                         continue;
1074
1075                 if (memcmp(id + 1, info->devid.id, info->devid.len))
1076                         continue;
1077
1078                 nand->memorg = table[i].memorg;
1079                 nanddev_set_ecc_requirements(nand, &table[i].eccreq);
1080                 spinand->eccinfo = table[i].eccinfo;
1081                 spinand->flags = table[i].flags;
1082                 spinand->id.len = 1 + table[i].devid.len;
1083                 spinand->select_target = table[i].select_target;
1084
1085                 op = spinand_select_op_variant(spinand,
1086                                                info->op_variants.read_cache);
1087                 if (!op)
1088                         return -ENOTSUPP;
1089
1090                 spinand->op_templates.read_cache = op;
1091
1092                 op = spinand_select_op_variant(spinand,
1093                                                info->op_variants.write_cache);
1094                 if (!op)
1095                         return -ENOTSUPP;
1096
1097                 spinand->op_templates.write_cache = op;
1098
1099                 op = spinand_select_op_variant(spinand,
1100                                                info->op_variants.update_cache);
1101                 spinand->op_templates.update_cache = op;
1102
1103                 return 0;
1104         }
1105
1106         return -ENOTSUPP;
1107 }
1108
1109 static int spinand_detect(struct spinand_device *spinand)
1110 {
1111         struct device *dev = &spinand->spimem->spi->dev;
1112         struct nand_device *nand = spinand_to_nand(spinand);
1113         int ret;
1114
1115         ret = spinand_reset_op(spinand);
1116         if (ret)
1117                 return ret;
1118
1119         ret = spinand_id_detect(spinand);
1120         if (ret) {
1121                 dev_err(dev, "unknown raw ID %*phN\n", SPINAND_MAX_ID_LEN,
1122                         spinand->id.data);
1123                 return ret;
1124         }
1125
1126         if (nand->memorg.ntargets > 1 && !spinand->select_target) {
1127                 dev_err(dev,
1128                         "SPI NANDs with more than one die must implement ->select_target()\n");
1129                 return -EINVAL;
1130         }
1131
1132         dev_info(&spinand->spimem->spi->dev,
1133                  "%s SPI NAND was found.\n", spinand->manufacturer->name);
1134         dev_info(&spinand->spimem->spi->dev,
1135                  "%llu MiB, block size: %zu KiB, page size: %zu, OOB size: %u\n",
1136                  nanddev_size(nand) >> 20, nanddev_eraseblock_size(nand) >> 10,
1137                  nanddev_page_size(nand), nanddev_per_page_oobsize(nand));
1138
1139         return 0;
1140 }
1141
1142 static int spinand_init_flash(struct spinand_device *spinand)
1143 {
1144         struct device *dev = &spinand->spimem->spi->dev;
1145         struct nand_device *nand = spinand_to_nand(spinand);
1146         int ret, i;
1147
1148         ret = spinand_read_cfg(spinand);
1149         if (ret)
1150                 return ret;
1151
1152         ret = spinand_init_quad_enable(spinand);
1153         if (ret)
1154                 return ret;
1155
1156         ret = spinand_upd_cfg(spinand, CFG_OTP_ENABLE, 0);
1157         if (ret)
1158                 return ret;
1159
1160         ret = spinand_manufacturer_init(spinand);
1161         if (ret) {
1162                 dev_err(dev,
1163                 "Failed to initialize the SPI NAND chip (err = %d)\n",
1164                 ret);
1165                 return ret;
1166         }
1167
1168         /* After power up, all blocks are locked, so unlock them here. */
1169         for (i = 0; i < nand->memorg.ntargets; i++) {
1170                 ret = spinand_select_target(spinand, i);
1171                 if (ret)
1172                         break;
1173
1174                 ret = spinand_lock_block(spinand, BL_ALL_UNLOCKED);
1175                 if (ret)
1176                         break;
1177         }
1178
1179         if (ret)
1180                 spinand_manufacturer_cleanup(spinand);
1181
1182         return ret;
1183 }
1184
1185 static void spinand_mtd_resume(struct mtd_info *mtd)
1186 {
1187         struct spinand_device *spinand = mtd_to_spinand(mtd);
1188         int ret;
1189
1190         ret = spinand_reset_op(spinand);
1191         if (ret)
1192                 return;
1193
1194         ret = spinand_init_flash(spinand);
1195         if (ret)
1196                 return;
1197
1198         spinand_ecc_enable(spinand, false);
1199 }
1200
1201 static int spinand_init(struct spinand_device *spinand)
1202 {
1203         struct device *dev = &spinand->spimem->spi->dev;
1204         struct mtd_info *mtd = spinand_to_mtd(spinand);
1205         struct nand_device *nand = mtd_to_nanddev(mtd);
1206         int ret;
1207
1208         /*
1209          * We need a scratch buffer because the spi_mem interface requires that
1210          * buf passed in spi_mem_op->data.buf be DMA-able.
1211          */
1212         spinand->scratchbuf = kzalloc(SPINAND_MAX_ID_LEN, GFP_KERNEL);
1213         if (!spinand->scratchbuf)
1214                 return -ENOMEM;
1215
1216         ret = spinand_detect(spinand);
1217         if (ret)
1218                 goto err_free_bufs;
1219
1220         /*
1221          * Use kzalloc() instead of devm_kzalloc() here, because some drivers
1222          * may use this buffer for DMA access.
1223          * Memory allocated by devm_ does not guarantee DMA-safe alignment.
1224          */
1225         spinand->databuf = kzalloc(nanddev_page_size(nand) +
1226                                nanddev_per_page_oobsize(nand),
1227                                GFP_KERNEL);
1228         if (!spinand->databuf) {
1229                 ret = -ENOMEM;
1230                 goto err_free_bufs;
1231         }
1232
1233         spinand->oobbuf = spinand->databuf + nanddev_page_size(nand);
1234
1235         ret = spinand_init_cfg_cache(spinand);
1236         if (ret)
1237                 goto err_free_bufs;
1238
1239         ret = spinand_init_flash(spinand);
1240         if (ret)
1241                 goto err_free_bufs;
1242
1243         ret = nanddev_init(nand, &spinand_ops, THIS_MODULE);
1244         if (ret)
1245                 goto err_manuf_cleanup;
1246
1247         /* SPI-NAND default ECC engine is on-die */
1248         nand->ecc.defaults.engine_type = NAND_ECC_ENGINE_TYPE_ON_DIE;
1249         nand->ecc.ondie_engine = &spinand_ondie_ecc_engine;
1250
1251         spinand_ecc_enable(spinand, false);
1252         ret = nanddev_ecc_engine_init(nand);
1253         if (ret)
1254                 goto err_cleanup_nanddev;
1255
1256         mtd->_read_oob = spinand_mtd_read;
1257         mtd->_write_oob = spinand_mtd_write;
1258         mtd->_block_isbad = spinand_mtd_block_isbad;
1259         mtd->_block_markbad = spinand_mtd_block_markbad;
1260         mtd->_block_isreserved = spinand_mtd_block_isreserved;
1261         mtd->_erase = spinand_mtd_erase;
1262         mtd->_max_bad_blocks = nanddev_mtd_max_bad_blocks;
1263         mtd->_resume = spinand_mtd_resume;
1264
1265         if (nand->ecc.engine) {
1266                 ret = mtd_ooblayout_count_freebytes(mtd);
1267                 if (ret < 0)
1268                         goto err_cleanup_ecc_engine;
1269         }
1270
1271         mtd->oobavail = ret;
1272
1273         /* Propagate ECC information to mtd_info */
1274         mtd->ecc_strength = nanddev_get_ecc_conf(nand)->strength;
1275         mtd->ecc_step_size = nanddev_get_ecc_conf(nand)->step_size;
1276
1277         ret = spinand_create_dirmaps(spinand);
1278         if (ret) {
1279                 dev_err(dev,
1280                         "Failed to create direct mappings for read/write operations (err = %d)\n",
1281                         ret);
1282                 goto err_cleanup_ecc_engine;
1283         }
1284
1285         return 0;
1286
1287 err_cleanup_ecc_engine:
1288         nanddev_ecc_engine_cleanup(nand);
1289
1290 err_cleanup_nanddev:
1291         nanddev_cleanup(nand);
1292
1293 err_manuf_cleanup:
1294         spinand_manufacturer_cleanup(spinand);
1295
1296 err_free_bufs:
1297         kfree(spinand->databuf);
1298         kfree(spinand->scratchbuf);
1299         return ret;
1300 }
1301
1302 static void spinand_cleanup(struct spinand_device *spinand)
1303 {
1304         struct nand_device *nand = spinand_to_nand(spinand);
1305
1306         nanddev_cleanup(nand);
1307         spinand_manufacturer_cleanup(spinand);
1308         kfree(spinand->databuf);
1309         kfree(spinand->scratchbuf);
1310 }
1311
1312 static int spinand_probe(struct spi_mem *mem)
1313 {
1314         struct spinand_device *spinand;
1315         struct mtd_info *mtd;
1316         int ret;
1317
1318         spinand = devm_kzalloc(&mem->spi->dev, sizeof(*spinand),
1319                                GFP_KERNEL);
1320         if (!spinand)
1321                 return -ENOMEM;
1322
1323         spinand->spimem = mem;
1324         spi_mem_set_drvdata(mem, spinand);
1325         spinand_set_of_node(spinand, mem->spi->dev.of_node);
1326         mutex_init(&spinand->lock);
1327         mtd = spinand_to_mtd(spinand);
1328         mtd->dev.parent = &mem->spi->dev;
1329
1330         ret = spinand_init(spinand);
1331         if (ret)
1332                 return ret;
1333
1334         ret = mtd_device_register(mtd, NULL, 0);
1335         if (ret)
1336                 goto err_spinand_cleanup;
1337
1338         return 0;
1339
1340 err_spinand_cleanup:
1341         spinand_cleanup(spinand);
1342
1343         return ret;
1344 }
1345
1346 static int spinand_remove(struct spi_mem *mem)
1347 {
1348         struct spinand_device *spinand;
1349         struct mtd_info *mtd;
1350         int ret;
1351
1352         spinand = spi_mem_get_drvdata(mem);
1353         mtd = spinand_to_mtd(spinand);
1354
1355         ret = mtd_device_unregister(mtd);
1356         if (ret)
1357                 return ret;
1358
1359         spinand_cleanup(spinand);
1360
1361         return 0;
1362 }
1363
1364 static const struct spi_device_id spinand_ids[] = {
1365         { .name = "spi-nand" },
1366         { /* sentinel */ },
1367 };
1368 MODULE_DEVICE_TABLE(spi, spinand_ids);
1369
1370 #ifdef CONFIG_OF
1371 static const struct of_device_id spinand_of_ids[] = {
1372         { .compatible = "spi-nand" },
1373         { /* sentinel */ },
1374 };
1375 MODULE_DEVICE_TABLE(of, spinand_of_ids);
1376 #endif
1377
1378 static struct spi_mem_driver spinand_drv = {
1379         .spidrv = {
1380                 .id_table = spinand_ids,
1381                 .driver = {
1382                         .name = "spi-nand",
1383                         .of_match_table = of_match_ptr(spinand_of_ids),
1384                 },
1385         },
1386         .probe = spinand_probe,
1387         .remove = spinand_remove,
1388 };
1389 module_spi_mem_driver(spinand_drv);
1390
1391 MODULE_DESCRIPTION("SPI NAND framework");
1392 MODULE_AUTHOR("Peter Pan<peterpandong@micron.com>");
1393 MODULE_LICENSE("GPL v2");