target/linux/sunxi/patches-4.1/111-mtd-add-support-for-nand-partitions.patch

   1 From a95cc309cf74eed3fc457dec3dcc44d9bf79e0e6 Mon Sep 17 00:00:00 2001
   2 From: Boris BREZILLON <boris.brezillon@free-electrons.com>
   3 Date: Mon, 28 Jul 2014 15:01:15 +0200
   4 Subject: [PATCH] mtd: nand: Add support for NAND partitions
   5
   6 Add support for NAND partitions, and indirectly for per partition ECC
   7 config, and also per partiton random seed support for the upcoming
   8 randomizer support.
   9
  10 This is necessary to be able to use different ECC / randomizer settings for
  11 the parts of the NAND which are read directly by a bootrom (which has a
  12 fixed ECC / random seed setting) and the generic data part of the NAND for
  13 which we often want a stronger ECC and / or random seed.
  14
  15 Provide helper functions to add/delete/allocate nand partitions.
  16 NAND core code now make use of the partition specific nand_ecc_ctrl struct
  17 (if available) when doing read/write operations.
  18
  19 Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
  20 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  21 ---
  22  drivers/mtd/nand/Kconfig     |   4 +
  23  drivers/mtd/nand/Makefile    |   2 +
  24  drivers/mtd/nand/nand_base.c | 712 +++++++++++++++++++++++++++++++++++--------
  25  drivers/mtd/nand/nand_bch.c  |  16 +-
  26  drivers/mtd/nand/nand_ecc.c  |   4 +-
  27  include/linux/mtd/nand.h     |  38 +++
  28  6 files changed, 635 insertions(+), 141 deletions(-)
  29
  30 diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
  31 index 5897d8d..8242470 100644
  32 --- a/drivers/mtd/nand/Kconfig
  33 +++ b/drivers/mtd/nand/Kconfig
  34 @@ -22,6 +22,10 @@ menuconfig MTD_NAND
  35
  36  if MTD_NAND
  37
  38 +config MTD_OF_NAND_PARTS
  39 +       tristate
  40 +       default n
  41 +
  42  config MTD_NAND_BCH
  43         tristate
  44         select BCH
  45 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
  46 index 582bbd05..fcbe032 100644
  47 --- a/drivers/mtd/nand/Makefile
  48 +++ b/drivers/mtd/nand/Makefile
  49 @@ -53,4 +53,6 @@ obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)  += bcm47xxnflash/
  50  obj-$(CONFIG_MTD_NAND_SUNXI)           += sunxi_nand.o
  51  obj-$(CONFIG_MTD_NAND_HISI504)         += hisi504_nand.o
  52
  53 +obj-$(CONFIG_MTD_OF_NAND_PARTS)                += ofnandpart.o
  54 +
  55  nand-objs := nand_base.o nand_bbt.o nand_timings.o
  56 diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
  57 index f580ed1..a30b67f 100644
  58 --- a/drivers/mtd/nand/nand_base.c
  59 +++ b/drivers/mtd/nand/nand_base.c
  60 @@ -1134,26 +1134,26 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
  61                                        struct nand_chip *chip, uint8_t *buf,
  62                                        int oob_required, int page)
  63  {
  64 -       int eccsize = chip->ecc.size;
  65 -       int eccbytes = chip->ecc.bytes;
  66 +       int eccsize = chip->cur_ecc->size;
  67 +       int eccbytes = chip->cur_ecc->bytes;
  68         uint8_t *oob = chip->oob_poi;
  69         int steps, size;
  70
  71 -       for (steps = chip->ecc.steps; steps > 0; steps--) {
  72 +       for (steps = chip->cur_ecc->steps; steps > 0; steps--) {
  73                 chip->read_buf(mtd, buf, eccsize);
  74                 buf += eccsize;
  75
  76 -               if (chip->ecc.prepad) {
  77 -                       chip->read_buf(mtd, oob, chip->ecc.prepad);
  78 -                       oob += chip->ecc.prepad;
  79 +               if (chip->cur_ecc->prepad) {
  80 +                       chip->read_buf(mtd, oob, chip->cur_ecc->prepad);
  81 +                       oob += chip->cur_ecc->prepad;
  82                 }
  83
  84                 chip->read_buf(mtd, oob, eccbytes);
  85                 oob += eccbytes;
  86
  87 -               if (chip->ecc.postpad) {
  88 -                       chip->read_buf(mtd, oob, chip->ecc.postpad);
  89 -                       oob += chip->ecc.postpad;
  90 +               if (chip->cur_ecc->postpad) {
  91 +                       chip->read_buf(mtd, oob, chip->cur_ecc->postpad);
  92 +                       oob += chip->cur_ecc->postpad;
  93                 }
  94         }
  95
  96 @@ -1175,30 +1175,31 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
  97  static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
  98                                 uint8_t *buf, int oob_required, int page)
  99  {
 100 -       int i, eccsize = chip->ecc.size;
 101 -       int eccbytes = chip->ecc.bytes;
 102 -       int eccsteps = chip->ecc.steps;
 103 +       int i, eccsize = chip->cur_ecc->size;
 104 +       int eccbytes = chip->cur_ecc->bytes;
 105 +       int eccsteps = chip->cur_ecc->steps;
 106         uint8_t *p = buf;
 107         uint8_t *ecc_calc = chip->buffers->ecccalc;
 108         uint8_t *ecc_code = chip->buffers->ecccode;
 109 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 110 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 111         unsigned int max_bitflips = 0;
 112
 113 -       chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
 114 +       chip->cur_ecc->read_page_raw(mtd, chip, buf, 1, page);
 115
 116         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 117 -               chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 118 +               chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
 119
 120 -       for (i = 0; i < chip->ecc.total; i++)
 121 +       for (i = 0; i < chip->cur_ecc->total; i++)
 122                 ecc_code[i] = chip->oob_poi[eccpos[i]];
 123
 124 -       eccsteps = chip->ecc.steps;
 125 +       eccsteps = chip->cur_ecc->steps;
 126         p = buf;
 127
 128         for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 129                 int stat;
 130
 131 -               stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
 132 +               stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i],
 133 +                                             &ecc_calc[i]);
 134                 if (stat < 0) {
 135                         mtd->ecc_stats.failed++;
 136                 } else {
 137 @@ -1223,7 +1224,7 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 138                         int page)
 139  {
 140         int start_step, end_step, num_steps;
 141 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 142 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 143         uint8_t *p;
 144         int data_col_addr, i, gaps = 0;
 145         int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
 146 @@ -1232,16 +1233,16 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 147         unsigned int max_bitflips = 0;
 148
 149         /* Column address within the page aligned to ECC size (256bytes) */
 150 -       start_step = data_offs / chip->ecc.size;
 151 -       end_step = (data_offs + readlen - 1) / chip->ecc.size;
 152 +       start_step = data_offs / chip->cur_ecc->size;
 153 +       end_step = (data_offs + readlen - 1) / chip->cur_ecc->size;
 154         num_steps = end_step - start_step + 1;
 155 -       index = start_step * chip->ecc.bytes;
 156 +       index = start_step * chip->cur_ecc->bytes;
 157
 158         /* Data size aligned to ECC ecc.size */
 159 -       datafrag_len = num_steps * chip->ecc.size;
 160 -       eccfrag_len = num_steps * chip->ecc.bytes;
 161 +       datafrag_len = num_steps * chip->cur_ecc->size;
 162 +       eccfrag_len = num_steps * chip->cur_ecc->bytes;
 163
 164 -       data_col_addr = start_step * chip->ecc.size;
 165 +       data_col_addr = start_step * chip->cur_ecc->size;
 166         /* If we read not a page aligned data */
 167         if (data_col_addr != 0)
 168                 chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
 169 @@ -1250,8 +1251,9 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 170         chip->read_buf(mtd, p, datafrag_len);
 171
 172         /* Calculate ECC */
 173 -       for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size)
 174 -               chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]);
 175 +       for (i = 0; i < eccfrag_len;
 176 +            i += chip->cur_ecc->bytes, p += chip->cur_ecc->size)
 177 +               chip->cur_ecc->calculate(mtd, p, &chip->buffers->ecccalc[i]);
 178
 179         /*
 180          * The performance is faster if we position offsets according to
 181 @@ -1275,7 +1277,8 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 182                 aligned_len = eccfrag_len;
 183                 if (eccpos[index] & (busw - 1))
 184                         aligned_len++;
 185 -               if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
 186 +               if (eccpos[index + (num_steps * chip->cur_ecc->bytes)] &
 187 +                   (busw - 1))
 188                         aligned_len++;
 189
 190                 chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
 191 @@ -1287,11 +1290,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 192                 chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
 193
 194         p = bufpoi + data_col_addr;
 195 -       for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
 196 +       for (i = 0; i < eccfrag_len;
 197 +            i += chip->cur_ecc->bytes, p += chip->cur_ecc->size) {
 198                 int stat;
 199
 200 -               stat = chip->ecc.correct(mtd, p,
 201 -                       &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]);
 202 +               stat = chip->cur_ecc->correct(mtd, p,
 203 +                                             &chip->buffers->ecccode[i],
 204 +                                             &chip->buffers->ecccalc[i]);
 205                 if (stat < 0) {
 206                         mtd->ecc_stats.failed++;
 207                 } else {
 208 @@ -1315,32 +1320,33 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 209  static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 210                                 uint8_t *buf, int oob_required, int page)
 211  {
 212 -       int i, eccsize = chip->ecc.size;
 213 -       int eccbytes = chip->ecc.bytes;
 214 -       int eccsteps = chip->ecc.steps;
 215 +       int i, eccsize = chip->cur_ecc->size;
 216 +       int eccbytes = chip->cur_ecc->bytes;
 217 +       int eccsteps = chip->cur_ecc->steps;
 218         uint8_t *p = buf;
 219         uint8_t *ecc_calc = chip->buffers->ecccalc;
 220         uint8_t *ecc_code = chip->buffers->ecccode;
 221 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 222 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 223         unsigned int max_bitflips = 0;
 224
 225         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 226 -               chip->ecc.hwctl(mtd, NAND_ECC_READ);
 227 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
 228                 chip->read_buf(mtd, p, eccsize);
 229 -               chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 230 +               chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
 231         }
 232         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 233
 234 -       for (i = 0; i < chip->ecc.total; i++)
 235 +       for (i = 0; i < chip->cur_ecc->total; i++)
 236                 ecc_code[i] = chip->oob_poi[eccpos[i]];
 237
 238 -       eccsteps = chip->ecc.steps;
 239 +       eccsteps = chip->cur_ecc->steps;
 240         p = buf;
 241
 242         for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 243                 int stat;
 244
 245 -               stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
 246 +               stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i],
 247 +                                             &ecc_calc[i]);
 248                 if (stat < 0) {
 249                         mtd->ecc_stats.failed++;
 250                 } else {
 251 @@ -1368,12 +1374,12 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 252  static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 253         struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 254  {
 255 -       int i, eccsize = chip->ecc.size;
 256 -       int eccbytes = chip->ecc.bytes;
 257 -       int eccsteps = chip->ecc.steps;
 258 +       int i, eccsize = chip->cur_ecc->size;
 259 +       int eccbytes = chip->cur_ecc->bytes;
 260 +       int eccsteps = chip->cur_ecc->steps;
 261         uint8_t *p = buf;
 262         uint8_t *ecc_code = chip->buffers->ecccode;
 263 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 264 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 265         uint8_t *ecc_calc = chip->buffers->ecccalc;
 266         unsigned int max_bitflips = 0;
 267
 268 @@ -1382,17 +1388,17 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 269         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 270         chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 271
 272 -       for (i = 0; i < chip->ecc.total; i++)
 273 +       for (i = 0; i < chip->cur_ecc->total; i++)
 274                 ecc_code[i] = chip->oob_poi[eccpos[i]];
 275
 276         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 277                 int stat;
 278
 279 -               chip->ecc.hwctl(mtd, NAND_ECC_READ);
 280 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
 281                 chip->read_buf(mtd, p, eccsize);
 282 -               chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 283 +               chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
 284
 285 -               stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL);
 286 +               stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i], NULL);
 287                 if (stat < 0) {
 288                         mtd->ecc_stats.failed++;
 289                 } else {
 290 @@ -1417,9 +1423,9 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 291  static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 292                                    uint8_t *buf, int oob_required, int page)
 293  {
 294 -       int i, eccsize = chip->ecc.size;
 295 -       int eccbytes = chip->ecc.bytes;
 296 -       int eccsteps = chip->ecc.steps;
 297 +       int i, eccsize = chip->cur_ecc->size;
 298 +       int eccbytes = chip->cur_ecc->bytes;
 299 +       int eccsteps = chip->cur_ecc->steps;
 300         uint8_t *p = buf;
 301         uint8_t *oob = chip->oob_poi;
 302         unsigned int max_bitflips = 0;
 303 @@ -1427,17 +1433,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 304         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 305                 int stat;
 306
 307 -               chip->ecc.hwctl(mtd, NAND_ECC_READ);
 308 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
 309                 chip->read_buf(mtd, p, eccsize);
 310
 311 -               if (chip->ecc.prepad) {
 312 -                       chip->read_buf(mtd, oob, chip->ecc.prepad);
 313 -                       oob += chip->ecc.prepad;
 314 +               if (chip->cur_ecc->prepad) {
 315 +                       chip->read_buf(mtd, oob, chip->cur_ecc->prepad);
 316 +                       oob += chip->cur_ecc->prepad;
 317                 }
 318
 319 -               chip->ecc.hwctl(mtd, NAND_ECC_READSYN);
 320 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_READSYN);
 321                 chip->read_buf(mtd, oob, eccbytes);
 322 -               stat = chip->ecc.correct(mtd, p, oob, NULL);
 323 +               stat = chip->cur_ecc->correct(mtd, p, oob, NULL);
 324
 325                 if (stat < 0) {
 326                         mtd->ecc_stats.failed++;
 327 @@ -1448,9 +1454,9 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 328
 329                 oob += eccbytes;
 330
 331 -               if (chip->ecc.postpad) {
 332 -                       chip->read_buf(mtd, oob, chip->ecc.postpad);
 333 -                       oob += chip->ecc.postpad;
 334 +               if (chip->cur_ecc->postpad) {
 335 +                       chip->read_buf(mtd, oob, chip->cur_ecc->postpad);
 336 +                       oob += chip->cur_ecc->postpad;
 337                 }
 338         }
 339
 340 @@ -1480,7 +1486,7 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 341                 return oob + len;
 342
 343         case MTD_OPS_AUTO_OOB: {
 344 -               struct nand_oobfree *free = chip->ecc.layout->oobfree;
 345 +               struct nand_oobfree *free = chip->cur_ecc->layout->oobfree;
 346                 uint32_t boffs = 0, roffs = ops->ooboffs;
 347                 size_t bytes = 0;
 348
 349 @@ -1600,17 +1606,21 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
 350                          * the read methods return max bitflips per ecc step.
 351                          */
 352                         if (unlikely(ops->mode == MTD_OPS_RAW))
 353 -                               ret = chip->ecc.read_page_raw(mtd, chip, bufpoi,
 354 -                                                             oob_required,
 355 -                                                             page);
 356 +                               ret = chip->cur_ecc->read_page_raw(mtd, chip,
 357 +                                                               bufpoi,
 358 +                                                               oob_required,
 359 +                                                               page);
 360                         else if (!aligned && NAND_HAS_SUBPAGE_READ(chip) &&
 361                                  !oob)
 362 -                               ret = chip->ecc.read_subpage(mtd, chip,
 363 -                                                       col, bytes, bufpoi,
 364 -                                                       page);
 365 +                               ret = chip->cur_ecc->read_subpage(mtd, chip,
 366 +                                                                 col, bytes,
 367 +                                                                 bufpoi,
 368 +                                                                 page);
 369                         else
 370 -                               ret = chip->ecc.read_page(mtd, chip, bufpoi,
 371 -                                                         oob_required, page);
 372 +                               ret = chip->cur_ecc->read_page(mtd, chip,
 373 +                                                              bufpoi,
 374 +                                                              oob_required,
 375 +                                                              page);
 376                         if (ret < 0) {
 377                                 if (use_bufpoi)
 378                                         /* Invalidate page cache */
 379 @@ -1746,6 +1756,39 @@ static int nand_read(struct mtd_info *mtd, loff_t from, size_t len,
 380  }
 381
 382  /**
 383 + * nand_part_read - [MTD Interface] MTD compatibility function for nand_do_read_ecc
 384 + * @mtd: MTD device structure
 385 + * @from: offset to read from
 386 + * @len: number of bytes to read
 387 + * @retlen: pointer to variable to store the number of read bytes
 388 + * @buf: the databuffer to put data
 389 + *
 390 + * Get hold of the chip and call nand_do_read.
 391 + */
 392 +static int nand_part_read(struct mtd_info *mtd, loff_t from, size_t len,
 393 +                         size_t *retlen, uint8_t *buf)
 394 +{
 395 +       struct nand_chip *chip = mtd->priv;
 396 +       struct nand_part *part = to_nand_part(mtd);
 397 +       struct mtd_oob_ops ops;
 398 +       int ret;
 399 +
 400 +       from += part->offset;
 401 +       nand_get_device(part->master, FL_READING);
 402 +       if (part->ecc)
 403 +               chip->cur_ecc = part->ecc;
 404 +       ops.len = len;
 405 +       ops.datbuf = buf;
 406 +       ops.oobbuf = NULL;
 407 +       ops.mode = MTD_OPS_PLACE_OOB;
 408 +       ret = nand_do_read_ops(part->master, from, &ops);
 409 +       *retlen = ops.retlen;
 410 +       chip->cur_ecc = &chip->ecc;
 411 +       nand_release_device(part->master);
 412 +       return ret;
 413 +}
 414 +
 415 +/**
 416   * nand_read_oob_std - [REPLACEABLE] the most common OOB data read function
 417   * @mtd: mtd info structure
 418   * @chip: nand chip info structure
 419 @@ -1770,13 +1813,14 @@ static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 420                                   int page)
 421  {
 422         int length = mtd->oobsize;
 423 -       int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
 424 -       int eccsize = chip->ecc.size;
 425 +       int chunk = chip->cur_ecc->bytes + chip->cur_ecc->prepad +
 426 +                   chip->cur_ecc->postpad;
 427 +       int eccsize = chip->cur_ecc->size;
 428         uint8_t *bufpoi = chip->oob_poi;
 429         int i, toread, sndrnd = 0, pos;
 430
 431 -       chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page);
 432 -       for (i = 0; i < chip->ecc.steps; i++) {
 433 +       chip->cmdfunc(mtd, NAND_CMD_READ0, chip->cur_ecc->size, page);
 434 +       for (i = 0; i < chip->cur_ecc->steps; i++) {
 435                 if (sndrnd) {
 436                         pos = eccsize + i * (eccsize + chunk);
 437                         if (mtd->writesize > 512)
 438 @@ -1829,9 +1873,10 @@ static int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
 439  static int nand_write_oob_syndrome(struct mtd_info *mtd,
 440                                    struct nand_chip *chip, int page)
 441  {
 442 -       int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
 443 -       int eccsize = chip->ecc.size, length = mtd->oobsize;
 444 -       int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps;
 445 +       int chunk = chip->cur_ecc->bytes + chip->cur_ecc->prepad +
 446 +                   chip->cur_ecc->postpad;
 447 +       int eccsize = chip->cur_ecc->size, length = mtd->oobsize;
 448 +       int i, len, pos, status = 0, sndcmd = 0, steps = chip->cur_ecc->steps;
 449         const uint8_t *bufpoi = chip->oob_poi;
 450
 451         /*
 452 @@ -1839,7 +1884,7 @@ static int nand_write_oob_syndrome(struct mtd_info *mtd,
 453          * or
 454          * data-pad-ecc-pad-data-pad .... ecc-pad-oob
 455          */
 456 -       if (!chip->ecc.prepad && !chip->ecc.postpad) {
 457 +       if (!chip->cur_ecc->prepad && !chip->cur_ecc->postpad) {
 458                 pos = steps * (eccsize + chunk);
 459                 steps = 0;
 460         } else
 461 @@ -1903,7 +1948,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 462         stats = mtd->ecc_stats;
 463
 464         if (ops->mode == MTD_OPS_AUTO_OOB)
 465 -               len = chip->ecc.layout->oobavail;
 466 +               len = chip->cur_ecc->layout->oobavail;
 467         else
 468                 len = mtd->oobsize;
 469
 470 @@ -1931,9 +1976,9 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 471
 472         while (1) {
 473                 if (ops->mode == MTD_OPS_RAW)
 474 -                       ret = chip->ecc.read_oob_raw(mtd, chip, page);
 475 +                       ret = chip->cur_ecc->read_oob_raw(mtd, chip, page);
 476                 else
 477 -                       ret = chip->ecc.read_oob(mtd, chip, page);
 478 +                       ret = chip->cur_ecc->read_oob(mtd, chip, page);
 479
 480                 if (ret < 0)
 481                         break;
 482 @@ -2021,6 +2066,56 @@ static int nand_read_oob(struct mtd_info *mtd, loff_t from,
 483         return ret;
 484  }
 485
 486 +/**
 487 + * nand_part_read_oob - [MTD Interface] NAND read data and/or out-of-band
 488 + * @mtd: MTD device structure
 489 + * @from: offset to read from
 490 + * @ops: oob operation description structure
 491 + *
 492 + * NAND read data and/or out-of-band data.
 493 + */
 494 +static int nand_part_read_oob(struct mtd_info *mtd, loff_t from,
 495 +                        struct mtd_oob_ops *ops)
 496 +{
 497 +       struct nand_chip *chip = mtd->priv;
 498 +       struct nand_part *part = to_nand_part(mtd);
 499 +       int ret = -ENOTSUPP;
 500 +
 501 +       ops->retlen = 0;
 502 +
 503 +       /* Do not allow reads past end of device */
 504 +       if (ops->datbuf && (from + ops->len) > mtd->size) {
 505 +               pr_debug("%s: attempt to read beyond end of device\n",
 506 +                               __func__);
 507 +               return -EINVAL;
 508 +       }
 509 +
 510 +       from += part->offset;
 511 +       nand_get_device(part->master, FL_READING);
 512 +       if (part->ecc)
 513 +               chip->cur_ecc = part->ecc;
 514 +
 515 +       switch (ops->mode) {
 516 +       case MTD_OPS_PLACE_OOB:
 517 +       case MTD_OPS_AUTO_OOB:
 518 +       case MTD_OPS_RAW:
 519 +               break;
 520 +
 521 +       default:
 522 +               goto out;
 523 +       }
 524 +
 525 +       if (!ops->datbuf)
 526 +               ret = nand_do_read_oob(part->master, from, ops);
 527 +       else
 528 +               ret = nand_do_read_ops(part->master, from, ops);
 529 +
 530 +out:
 531 +       chip->cur_ecc = &chip->ecc;
 532 +       nand_release_device(part->master);
 533 +       return ret;
 534 +}
 535 +
 536
 537  /**
 538   * nand_write_page_raw - [INTERN] raw page write function
 539 @@ -2054,26 +2149,26 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
 540                                         struct nand_chip *chip,
 541                                         const uint8_t *buf, int oob_required)
 542  {
 543 -       int eccsize = chip->ecc.size;
 544 -       int eccbytes = chip->ecc.bytes;
 545 +       int eccsize = chip->cur_ecc->size;
 546 +       int eccbytes = chip->cur_ecc->bytes;
 547         uint8_t *oob = chip->oob_poi;
 548         int steps, size;
 549
 550 -       for (steps = chip->ecc.steps; steps > 0; steps--) {
 551 +       for (steps = chip->cur_ecc->steps; steps > 0; steps--) {
 552                 chip->write_buf(mtd, buf, eccsize);
 553                 buf += eccsize;
 554
 555 -               if (chip->ecc.prepad) {
 556 -                       chip->write_buf(mtd, oob, chip->ecc.prepad);
 557 -                       oob += chip->ecc.prepad;
 558 +               if (chip->cur_ecc->prepad) {
 559 +                       chip->write_buf(mtd, oob, chip->cur_ecc->prepad);
 560 +                       oob += chip->cur_ecc->prepad;
 561                 }
 562
 563                 chip->write_buf(mtd, oob, eccbytes);
 564                 oob += eccbytes;
 565
 566 -               if (chip->ecc.postpad) {
 567 -                       chip->write_buf(mtd, oob, chip->ecc.postpad);
 568 -                       oob += chip->ecc.postpad;
 569 +               if (chip->cur_ecc->postpad) {
 570 +                       chip->write_buf(mtd, oob, chip->cur_ecc->postpad);
 571 +                       oob += chip->cur_ecc->postpad;
 572                 }
 573         }
 574
 575 @@ -2093,21 +2188,21 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
 576  static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 577                                   const uint8_t *buf, int oob_required)
 578  {
 579 -       int i, eccsize = chip->ecc.size;
 580 -       int eccbytes = chip->ecc.bytes;
 581 -       int eccsteps = chip->ecc.steps;
 582 +       int i, eccsize = chip->cur_ecc->size;
 583 +       int eccbytes = chip->cur_ecc->bytes;
 584 +       int eccsteps = chip->cur_ecc->steps;
 585         uint8_t *ecc_calc = chip->buffers->ecccalc;
 586         const uint8_t *p = buf;
 587 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 588 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 589
 590         /* Software ECC calculation */
 591         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 592 -               chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 593 +               chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
 594
 595 -       for (i = 0; i < chip->ecc.total; i++)
 596 +       for (i = 0; i < chip->cur_ecc->total; i++)
 597                 chip->oob_poi[eccpos[i]] = ecc_calc[i];
 598
 599 -       return chip->ecc.write_page_raw(mtd, chip, buf, 1);
 600 +       return chip->cur_ecc->write_page_raw(mtd, chip, buf, 1);
 601  }
 602
 603  /**
 604 @@ -2120,20 +2215,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 605  static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 606                                   const uint8_t *buf, int oob_required)
 607  {
 608 -       int i, eccsize = chip->ecc.size;
 609 -       int eccbytes = chip->ecc.bytes;
 610 -       int eccsteps = chip->ecc.steps;
 611 +       int i, eccsize = chip->cur_ecc->size;
 612 +       int eccbytes = chip->cur_ecc->bytes;
 613 +       int eccsteps = chip->cur_ecc->steps;
 614         uint8_t *ecc_calc = chip->buffers->ecccalc;
 615         const uint8_t *p = buf;
 616 -       uint32_t *eccpos = chip->ecc.layout->eccpos;
 617 +       uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
 618
 619         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 620 -               chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
 621 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
 622                 chip->write_buf(mtd, p, eccsize);
 623 -               chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 624 +               chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
 625         }
 626
 627 -       for (i = 0; i < chip->ecc.total; i++)
 628 +       for (i = 0; i < chip->cur_ecc->total; i++)
 629                 chip->oob_poi[eccpos[i]] = ecc_calc[i];
 630
 631         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 632 @@ -2158,10 +2253,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 633  {
 634         uint8_t *oob_buf  = chip->oob_poi;
 635         uint8_t *ecc_calc = chip->buffers->ecccalc;
 636 -       int ecc_size      = chip->ecc.size;
 637 -       int ecc_bytes     = chip->ecc.bytes;
 638 -       int ecc_steps     = chip->ecc.steps;
 639 -       uint32_t *eccpos  = chip->ecc.layout->eccpos;
 640 +       int ecc_size      = chip->cur_ecc->size;
 641 +       int ecc_bytes     = chip->cur_ecc->bytes;
 642 +       int ecc_steps     = chip->cur_ecc->steps;
 643 +       uint32_t *eccpos  = chip->cur_ecc->layout->eccpos;
 644         uint32_t start_step = offset / ecc_size;
 645         uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 646         int oob_bytes       = mtd->oobsize / ecc_steps;
 647 @@ -2169,7 +2264,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 648
 649         for (step = 0; step < ecc_steps; step++) {
 650                 /* configure controller for WRITE access */
 651 -               chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
 652 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
 653
 654                 /* write data (untouched subpages already masked by 0xFF) */
 655                 chip->write_buf(mtd, buf, ecc_size);
 656 @@ -2178,7 +2273,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 657                 if ((step < start_step) || (step > end_step))
 658                         memset(ecc_calc, 0xff, ecc_bytes);
 659                 else
 660 -                       chip->ecc.calculate(mtd, buf, ecc_calc);
 661 +                       chip->cur_ecc->calculate(mtd, buf, ecc_calc);
 662
 663                 /* mask OOB of un-touched subpages by padding 0xFF */
 664                 /* if oob_required, preserve OOB metadata of written subpage */
 665 @@ -2193,7 +2288,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 666         /* copy calculated ECC for whole page to chip->buffer->oob */
 667         /* this include masked-value(0xFF) for unwritten subpages */
 668         ecc_calc = chip->buffers->ecccalc;
 669 -       for (i = 0; i < chip->ecc.total; i++)
 670 +       for (i = 0; i < chip->cur_ecc->total; i++)
 671                 chip->oob_poi[eccpos[i]] = ecc_calc[i];
 672
 673         /* write OOB buffer to NAND device */
 674 @@ -2217,29 +2312,29 @@ static int nand_write_page_syndrome(struct mtd_info *mtd,
 675                                     struct nand_chip *chip,
 676                                     const uint8_t *buf, int oob_required)
 677  {
 678 -       int i, eccsize = chip->ecc.size;
 679 -       int eccbytes = chip->ecc.bytes;
 680 -       int eccsteps = chip->ecc.steps;
 681 +       int i, eccsize = chip->cur_ecc->size;
 682 +       int eccbytes = chip->cur_ecc->bytes;
 683 +       int eccsteps = chip->cur_ecc->steps;
 684         const uint8_t *p = buf;
 685         uint8_t *oob = chip->oob_poi;
 686
 687         for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 688
 689 -               chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
 690 +               chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
 691                 chip->write_buf(mtd, p, eccsize);
 692
 693 -               if (chip->ecc.prepad) {
 694 -                       chip->write_buf(mtd, oob, chip->ecc.prepad);
 695 -                       oob += chip->ecc.prepad;
 696 +               if (chip->cur_ecc->prepad) {
 697 +                       chip->write_buf(mtd, oob, chip->cur_ecc->prepad);
 698 +                       oob += chip->cur_ecc->prepad;
 699                 }
 700
 701 -               chip->ecc.calculate(mtd, p, oob);
 702 +               chip->cur_ecc->calculate(mtd, p, oob);
 703                 chip->write_buf(mtd, oob, eccbytes);
 704                 oob += eccbytes;
 705
 706 -               if (chip->ecc.postpad) {
 707 -                       chip->write_buf(mtd, oob, chip->ecc.postpad);
 708 -                       oob += chip->ecc.postpad;
 709 +               if (chip->cur_ecc->postpad) {
 710 +                       chip->write_buf(mtd, oob, chip->cur_ecc->postpad);
 711 +                       oob += chip->cur_ecc->postpad;
 712                 }
 713         }
 714
 715 @@ -2270,7 +2365,7 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 716         int status, subpage;
 717
 718         if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
 719 -               chip->ecc.write_subpage)
 720 +               chip->cur_ecc->write_subpage)
 721                 subpage = offset || (data_len < mtd->writesize);
 722         else
 723                 subpage = 0;
 724 @@ -2278,13 +2373,15 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 725         chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
 726
 727         if (unlikely(raw))
 728 -               status = chip->ecc.write_page_raw(mtd, chip, buf,
 729 -                                                       oob_required);
 730 +               status = chip->cur_ecc->write_page_raw(mtd, chip, buf,
 731 +                                                      oob_required);
 732         else if (subpage)
 733 -               status = chip->ecc.write_subpage(mtd, chip, offset, data_len,
 734 -                                                        buf, oob_required);
 735 +               status = chip->cur_ecc->write_subpage(mtd, chip, offset,
 736 +                                                     data_len, buf,
 737 +                                                     oob_required);
 738         else
 739 -               status = chip->ecc.write_page(mtd, chip, buf, oob_required);
 740 +               status = chip->cur_ecc->write_page(mtd, chip, buf,
 741 +                                                  oob_required);
 742
 743         if (status < 0)
 744                 return status;
 745 @@ -2343,7 +2440,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 746                 return oob + len;
 747
 748         case MTD_OPS_AUTO_OOB: {
 749 -               struct nand_oobfree *free = chip->ecc.layout->oobfree;
 750 +               struct nand_oobfree *free = chip->cur_ecc->layout->oobfree;
 751                 uint32_t boffs = 0, woffs = ops->ooboffs;
 752                 size_t bytes = 0;
 753
 754 @@ -2539,6 +2636,46 @@ static int panic_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
 755  }
 756
 757  /**
 758 + * panic_nand_part_write - [MTD Interface] NAND write with ECC
 759 + * @mtd: MTD device structure
 760 + * @to: offset to write to
 761 + * @len: number of bytes to write
 762 + * @retlen: pointer to variable to store the number of written bytes
 763 + * @buf: the data to write
 764 + *
 765 + * NAND write with ECC. Used when performing writes in interrupt context, this
 766 + * may for example be called by mtdoops when writing an oops while in panic.
 767 + */
 768 +static int panic_nand_part_write(struct mtd_info *mtd, loff_t to, size_t len,
 769 +                           size_t *retlen, const uint8_t *buf)
 770 +{
 771 +       struct nand_chip *chip = mtd->priv;
 772 +       struct nand_part *part = to_nand_part(mtd);
 773 +       struct mtd_oob_ops ops;
 774 +       int ret;
 775 +
 776 +       to += part->offset;
 777 +       /* Wait for the device to get ready */
 778 +       panic_nand_wait(part->master, chip, 400);
 779 +
 780 +       /* Grab the device */
 781 +       panic_nand_get_device(chip, part->master, FL_WRITING);
 782 +       if (part->ecc)
 783 +               chip->cur_ecc = part->ecc;
 784 +
 785 +       ops.len = len;
 786 +       ops.datbuf = (uint8_t *)buf;
 787 +       ops.oobbuf = NULL;
 788 +       ops.mode = MTD_OPS_PLACE_OOB;
 789 +
 790 +       ret = nand_do_write_ops(part->master, to, &ops);
 791 +
 792 +       chip->cur_ecc = &chip->ecc;
 793 +       *retlen = ops.retlen;
 794 +       return ret;
 795 +}
 796 +
 797 +/**
 798   * nand_write - [MTD Interface] NAND write with ECC
 799   * @mtd: MTD device structure
 800   * @to: offset to write to
 801 @@ -2566,6 +2703,39 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
 802  }
 803
 804  /**
 805 + * nand_part_write - [MTD Interface] NAND write with ECC
 806 + * @mtd: MTD device structure
 807 + * @to: offset to write to
 808 + * @len: number of bytes to write
 809 + * @retlen: pointer to variable to store the number of written bytes
 810 + * @buf: the data to write
 811 + *
 812 + * NAND write with ECC.
 813 + */
 814 +static int nand_part_write(struct mtd_info *mtd, loff_t to, size_t len,
 815 +                         size_t *retlen, const uint8_t *buf)
 816 +{
 817 +       struct nand_chip *chip = mtd->priv;
 818 +       struct nand_part *part = to_nand_part(mtd);
 819 +       struct mtd_oob_ops ops;
 820 +       int ret;
 821 +
 822 +       to += part->offset;
 823 +       nand_get_device(part->master, FL_WRITING);
 824 +       if (part->ecc)
 825 +               chip->cur_ecc = part->ecc;
 826 +       ops.len = len;
 827 +       ops.datbuf = (uint8_t *)buf;
 828 +       ops.oobbuf = NULL;
 829 +       ops.mode = MTD_OPS_PLACE_OOB;
 830 +       ret = nand_do_write_ops(part->master, to, &ops);
 831 +       *retlen = ops.retlen;
 832 +       chip->cur_ecc = &chip->ecc;
 833 +       nand_release_device(part->master);
 834 +       return ret;
 835 +}
 836 +
 837 +/**
 838   * nand_do_write_oob - [MTD Interface] NAND write out-of-band
 839   * @mtd: MTD device structure
 840   * @to: offset to write to
 841 @@ -2583,7 +2753,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 842                          __func__, (unsigned int)to, (int)ops->ooblen);
 843
 844         if (ops->mode == MTD_OPS_AUTO_OOB)
 845 -               len = chip->ecc.layout->oobavail;
 846 +               len = chip->cur_ecc->layout->oobavail;
 847         else
 848                 len = mtd->oobsize;
 849
 850 @@ -2637,9 +2807,11 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 851         nand_fill_oob(mtd, ops->oobbuf, ops->ooblen, ops);
 852
 853         if (ops->mode == MTD_OPS_RAW)
 854 -               status = chip->ecc.write_oob_raw(mtd, chip, page & chip->pagemask);
 855 +               status = chip->cur_ecc->write_oob_raw(mtd, chip,
 856 +                                                     page & chip->pagemask);
 857         else
 858 -               status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
 859 +               status = chip->cur_ecc->write_oob(mtd, chip,
 860 +                                                 page & chip->pagemask);
 861
 862         chip->select_chip(mtd, -1);
 863
 864 @@ -2694,6 +2866,54 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
 865  }
 866
 867  /**
 868 + * nand_write_oob - [MTD Interface] NAND write data and/or out-of-band
 869 + * @mtd: MTD device structure
 870 + * @to: offset to write to
 871 + * @ops: oob operation description structure
 872 + */
 873 +static int nand_part_write_oob(struct mtd_info *mtd, loff_t to,
 874 +                         struct mtd_oob_ops *ops)
 875 +{
 876 +       struct nand_chip *chip = mtd->priv;
 877 +       struct nand_part *part = to_nand_part(mtd);
 878 +       int ret = -ENOTSUPP;
 879 +
 880 +       ops->retlen = 0;
 881 +
 882 +       /* Do not allow writes past end of device */
 883 +       if (ops->datbuf && (to + ops->len) > mtd->size) {
 884 +               pr_debug("%s: attempt to write beyond end of device\n",
 885 +                               __func__);
 886 +               return -EINVAL;
 887 +       }
 888 +
 889 +       to += part->offset;
 890 +       nand_get_device(part->master, FL_WRITING);
 891 +       if (part->ecc)
 892 +               chip->cur_ecc = part->ecc;
 893 +
 894 +       switch (ops->mode) {
 895 +       case MTD_OPS_PLACE_OOB:
 896 +       case MTD_OPS_AUTO_OOB:
 897 +       case MTD_OPS_RAW:
 898 +               break;
 899 +
 900 +       default:
 901 +               goto out;
 902 +       }
 903 +
 904 +       if (!ops->datbuf)
 905 +               ret = nand_do_write_oob(part->master, to, ops);
 906 +       else
 907 +               ret = nand_do_write_ops(part->master, to, ops);
 908 +
 909 +out:
 910 +       chip->cur_ecc = &chip->ecc;
 911 +       nand_release_device(part->master);
 912 +       return ret;
 913 +}
 914 +
 915 +/**
 916   * single_erase - [GENERIC] NAND standard block erase command function
 917   * @mtd: MTD device structure
 918   * @page: the page address of the block which will be erased
 919 @@ -2723,6 +2943,29 @@ static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
 920  }
 921
 922  /**
 923 + * nand_part_erase - [MTD Interface] erase partition block(s)
 924 + * @mtd: MTD device structure
 925 + * @instr: erase instruction
 926 + *
 927 + * Erase one ore more blocks.
 928 + */
 929 +static int nand_part_erase(struct mtd_info *mtd, struct erase_info *instr)
 930 +{
 931 +       struct nand_part *part = to_nand_part(mtd);
 932 +       int ret;
 933 +
 934 +       instr->addr += part->offset;
 935 +       ret = nand_erase_nand(part->master, instr, 0);
 936 +       if (ret) {
 937 +               if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 938 +                       instr->fail_addr -= part->offset;
 939 +               instr->addr -= part->offset;
 940 +       }
 941 +
 942 +       return ret;
 943 +}
 944 +
 945 +/**
 946   * nand_erase_nand - [INTERN] erase block(s)
 947   * @mtd: MTD device structure
 948   * @instr: erase instruction
 949 @@ -2864,6 +3107,18 @@ static int nand_block_isbad(struct mtd_info *mtd, loff_t offs)
 950  }
 951
 952  /**
 953 + * nand_part_block_isbad - [MTD Interface] Check if block at offset is bad
 954 + * @mtd: MTD device structure
 955 + * @offs: offset relative to mtd start
 956 + */
 957 +static int nand_part_block_isbad(struct mtd_info *mtd, loff_t offs)
 958 +{
 959 +       struct nand_part *part = to_nand_part(mtd);
 960 +
 961 +       return nand_block_checkbad(part->master, part->offset + offs, 1, 0);
 962 +}
 963 +
 964 +/**
 965   * nand_block_markbad - [MTD Interface] Mark block at the given offset as bad
 966   * @mtd: MTD device structure
 967   * @ofs: offset relative to mtd start
 968 @@ -2884,6 +3139,33 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
 969  }
 970
 971  /**
 972 + * nand_part_block_markbad - [MTD Interface] Mark block at the given offset as
 973 + *                          bad
 974 + * @mtd: MTD device structure
 975 + * @ofs: offset relative to mtd start
 976 + */
 977 +static int nand_part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 978 +{
 979 +       struct nand_part *part = to_nand_part(mtd);
 980 +       int ret;
 981 +
 982 +       ofs += part->offset;
 983 +       ret = nand_block_isbad(part->master, ofs);
 984 +       if (ret) {
 985 +               /* If it was bad already, return success and do nothing */
 986 +               if (ret > 0)
 987 +                       return 0;
 988 +               return ret;
 989 +       }
 990 +
 991 +       ret = nand_block_markbad_lowlevel(part->master, ofs);
 992 +       if (!ret)
 993 +               mtd->ecc_stats.badblocks++;
 994 +
 995 +       return ret;
 996 +}
 997 +
 998 +/**
 999   * nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand
1000   * @mtd: MTD device structure
1001   * @chip: nand chip info structure
1002 @@ -4099,6 +4381,169 @@ static int nand_ecc_ctrl_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc)
1003  }
1004
1005  /**
1006 + * nand_add_partition - [NAND Interface] Add a NAND partition to a NAND device
1007 + * @master: MTD device structure representing the NAND device
1008 + * @part: NAND partition to add to the NAND device
1009 + *
1010 + * Adds a NAND partition to a NAND device.
1011 + * The NAND partition cannot overlap with another existing partition.
1012 + *
1013 + * Returns zero in case of success and a negative error code in case of failure.
1014 + */
1015 +int nand_add_partition(struct mtd_info *master, struct nand_part *part)
1016 +{
1017 +       struct nand_chip *chip = master->priv;
1018 +       struct mtd_info *mtd = &part->mtd;
1019 +       struct nand_ecc_ctrl *ecc = part->ecc;
1020 +       struct nand_part *pos;
1021 +       bool inserted = false;
1022 +       int ret;
1023 +
1024 +       /* set up the MTD object for this partition */
1025 +       mtd->type = master->type;
1026 +       mtd->flags = master->flags & ~mtd->flags;
1027 +       mtd->writesize = master->writesize;
1028 +       mtd->writebufsize = master->writebufsize;
1029 +       mtd->oobsize = master->oobsize;
1030 +       mtd->oobavail = master->oobavail;
1031 +       mtd->subpage_sft = master->subpage_sft;
1032 +       mtd->erasesize = master->erasesize;
1033 +
1034 +       mtd->priv = chip;
1035 +       mtd->owner = master->owner;
1036 +       mtd->backing_dev_info = master->backing_dev_info;
1037 +
1038 +       mtd->dev.parent = master->dev.parent;
1039 +
1040 +       if (ecc) {
1041 +               ret = nand_ecc_ctrl_init(mtd, ecc);
1042 +               if (ret)
1043 +                       return ret;
1044 +       } else {
1045 +               ecc = &chip->ecc;
1046 +       }
1047 +
1048 +       mtd->_erase = nand_part_erase;
1049 +       mtd->_point = NULL;
1050 +       mtd->_unpoint = NULL;
1051 +       mtd->_read = nand_part_read;
1052 +       mtd->_write = nand_part_write;
1053 +       mtd->_panic_write = panic_nand_part_write;
1054 +       mtd->_read_oob = nand_part_read_oob;
1055 +       mtd->_write_oob = nand_part_write_oob;
1056 +       mtd->_sync = nand_sync;
1057 +       mtd->_lock = NULL;
1058 +       mtd->_unlock = NULL;
1059 +       mtd->_suspend = nand_suspend;
1060 +       mtd->_resume = nand_resume;
1061 +       mtd->_block_isbad = nand_part_block_isbad;
1062 +       mtd->_block_markbad = nand_part_block_markbad;
1063 +
1064 +       /* propagate ecc info to mtd_info */
1065 +       mtd->ecclayout = ecc->layout;
1066 +       mtd->ecc_strength = ecc->strength;
1067 +       mtd->ecc_step_size = ecc->size;
1068 +       /*
1069 +        * Initialize bitflip_threshold to its default prior scan_bbt() call.
1070 +        * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
1071 +        * properly set.
1072 +        */
1073 +       if (!mtd->bitflip_threshold)
1074 +               mtd->bitflip_threshold = mtd->ecc_strength;
1075 +
1076 +       part->master = master;
1077 +
1078 +       mutex_lock(&chip->part_lock);
1079 +       list_for_each_entry(pos, &chip->partitions, node) {
1080 +               if (part->offset >= pos->offset + pos->mtd.size) {
1081 +                       continue;
1082 +               } else if (part->offset + mtd->size > pos->offset) {
1083 +                       ret = -EINVAL;
1084 +                       goto out;
1085 +               }
1086 +
1087 +               list_add(&part->node, pos->node.prev);
1088 +               inserted = true;
1089 +               break;
1090 +       }
1091 +
1092 +       if (!inserted)
1093 +               list_add_tail(&part->node, &chip->partitions);
1094 +
1095 +       ret = mtd_device_register(mtd, NULL, 0);
1096 +       if (ret) {
1097 +               list_del(&part->node);
1098 +               goto out;
1099 +       }
1100 +
1101 +       if (master->_block_isbad) {
1102 +               uint64_t offs = 0;
1103 +
1104 +               while (offs < mtd->size) {
1105 +                       if (mtd_block_isreserved(master, offs + part->offset))
1106 +                               mtd->ecc_stats.bbtblocks++;
1107 +                       else if (mtd_block_isbad(master, offs + part->offset))
1108 +                               mtd->ecc_stats.badblocks++;
1109 +                       offs += mtd->erasesize;
1110 +               }
1111 +       }
1112 +
1113 +out:
1114 +       mutex_unlock(&chip->part_lock);
1115 +       return ret;
1116 +}
1117 +EXPORT_SYMBOL(nand_add_partition);
1118 +
1119 +/**
1120 + * nand_del_partition - [NAND Interface] Delete a NAND part from a NAND dev
1121 + * @part: NAND partition to delete
1122 + *
1123 + * Deletes a NAND partition from a NAND device.
1124 + */
1125 +void nand_del_partition(struct nand_part *part)
1126 +{
1127 +       struct nand_chip *chip = part->mtd.priv;
1128 +
1129 +       mutex_lock(&chip->part_lock);
1130 +       mtd_device_unregister(&part->mtd);
1131 +       list_del(&part->node);
1132 +       mutex_unlock(&chip->part_lock);
1133 +
1134 +       if (part->ecc && part->ecc->mode == NAND_ECC_SOFT_BCH)
1135 +               nand_bch_free((struct nand_bch_control *)part->ecc->priv);
1136 +
1137 +       if (part->release)
1138 +               part->release(part);
1139 +}
1140 +EXPORT_SYMBOL(nand_del_partition);
1141 +
1142 +/*
1143 + * NAND part release function. Used by nandpart_alloc as its release function.
1144 + */
1145 +static void nandpart_release(struct nand_part *part)
1146 +{
1147 +       kfree(part);
1148 +}
1149 +
1150 +/**
1151 + * nandpart_alloc - [NAND Interface] Allocate a NAND part struct
1152 + *
1153 + * Allocate a NAND partition and assign the nandpart release function.
1154 + * This nand_part struct must be filled before passing it to the
1155 + * nand_add_partition function.
1156 + */
1157 +struct nand_part *nandpart_alloc(void)
1158 +{
1159 +       struct nand_part *part = kzalloc(sizeof(*part), GFP_KERNEL);
1160 +       if (!part)
1161 +               return ERR_PTR(-ENOMEM);
1162 +       part->release = nandpart_release;
1163 +
1164 +       return part;
1165 +}
1166 +EXPORT_SYMBOL(nandpart_alloc);
1167 +
1168 +/**
1169   * nand_scan_tail - [NAND Interface] Scan for the NAND device
1170   * @mtd: MTD device structure
1171   *
1172 @@ -4146,6 +4591,11 @@ int nand_scan_tail(struct mtd_info *mtd)
1173                 return ret;
1174         }
1175
1176 +       INIT_LIST_HEAD(&chip->partitions);
1177 +       mutex_init(&chip->part_lock);
1178 +
1179 +       chip->cur_ecc = &chip->ecc;
1180 +
1181         /* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
1182         if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {
1183                 switch (ecc->steps) {
1184 diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
1185 index 3803e0b..b82b976 100644
1186 --- a/drivers/mtd/nand/nand_bch.c
1187 +++ b/drivers/mtd/nand/nand_bch.c
1188 @@ -53,14 +53,14 @@ int nand_bch_calculate_ecc(struct mtd_info *mtd, const unsigned char *buf,
1189                            unsigned char *code)
1190  {
1191         const struct nand_chip *chip = mtd->priv;
1192 -       struct nand_bch_control *nbc = chip->ecc.priv;
1193 +       struct nand_bch_control *nbc = chip->cur_ecc->priv;
1194         unsigned int i;
1195
1196 -       memset(code, 0, chip->ecc.bytes);
1197 -       encode_bch(nbc->bch, buf, chip->ecc.size, code);
1198 +       memset(code, 0, chip->cur_ecc->bytes);
1199 +       encode_bch(nbc->bch, buf, chip->cur_ecc->size, code);
1200
1201         /* apply mask so that an erased page is a valid codeword */
1202 -       for (i = 0; i < chip->ecc.bytes; i++)
1203 +       for (i = 0; i < chip->cur_ecc->bytes; i++)
1204                 code[i] ^= nbc->eccmask[i];
1205
1206         return 0;
1207 @@ -80,15 +80,15 @@ int nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
1208                           unsigned char *read_ecc, unsigned char *calc_ecc)
1209  {
1210         const struct nand_chip *chip = mtd->priv;
1211 -       struct nand_bch_control *nbc = chip->ecc.priv;
1212 +       struct nand_bch_control *nbc = chip->cur_ecc->priv;
1213         unsigned int *errloc = nbc->errloc;
1214         int i, count;
1215
1216 -       count = decode_bch(nbc->bch, NULL, chip->ecc.size, read_ecc, calc_ecc,
1217 -                          NULL, errloc);
1218 +       count = decode_bch(nbc->bch, NULL, chip->cur_ecc->size, read_ecc,
1219 +                          calc_ecc, NULL, errloc);
1220         if (count > 0) {
1221                 for (i = 0; i < count; i++) {
1222 -                       if (errloc[i] < (chip->ecc.size*8))
1223 +                       if (errloc[i] < (chip->cur_ecc->size*8))
1224                                 /* error is located in data, correct it */
1225                                 buf[errloc[i] >> 3] ^= (1 << (errloc[i] & 7));
1226                         /* else error in ecc, no action needed */
1227 diff --git a/drivers/mtd/nand/nand_ecc.c b/drivers/mtd/nand/nand_ecc.c
1228 index 97c4c02..f35c418 100644
1229 --- a/drivers/mtd/nand/nand_ecc.c
1230 +++ b/drivers/mtd/nand/nand_ecc.c
1231 @@ -424,7 +424,7 @@ int nand_calculate_ecc(struct mtd_info *mtd, const unsigned char *buf,
1232                        unsigned char *code)
1233  {
1234         __nand_calculate_ecc(buf,
1235 -                       ((struct nand_chip *)mtd->priv)->ecc.size, code);
1236 +                       ((struct nand_chip *)mtd->priv)->cur_ecc->size, code);
1237
1238         return 0;
1239  }
1240 @@ -524,7 +524,7 @@ int nand_correct_data(struct mtd_info *mtd, unsigned char *buf,
1241                       unsigned char *read_ecc, unsigned char *calc_ecc)
1242  {
1243         return __nand_correct_data(buf, read_ecc, calc_ecc,
1244 -                                  ((struct nand_chip *)mtd->priv)->ecc.size);
1245 +                       ((struct nand_chip *)mtd->priv)->cur_ecc->size);
1246  }
1247  EXPORT_SYMBOL(nand_correct_data);
1248
1249 diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
1250 index 3d4ea7e..510e09b 100644
1251 --- a/include/linux/mtd/nand.h
1252 +++ b/include/linux/mtd/nand.h
1253 @@ -708,6 +708,7 @@ struct nand_chip {
1254         struct nand_hw_control *controller;
1255
1256         struct nand_ecc_ctrl ecc;
1257 +       struct nand_ecc_ctrl *cur_ecc;
1258         struct nand_buffers *buffers;
1259         struct nand_hw_control hwcontrol;
1260
1261 @@ -717,9 +718,46 @@ struct nand_chip {
1262
1263         struct nand_bbt_descr *badblock_pattern;
1264
1265 +       struct list_head partitions;
1266 +       struct mutex part_lock;
1267 +
1268         void *priv;
1269  };
1270
1271 +/**
1272 + * struct nand_part - NAND partition structure
1273 + * @node:      list node used to attach the partition to its NAND dev
1274 + * @mtd:       MTD partiton info
1275 + * @master:    MTD device representing the NAND chip
1276 + * @offset:    partition offset
1277 + * @ecc:       partition specific ECC struct
1278 + * @release:   function used to release this nand_part struct
1279 + *
1280 + * NAND partitions work as standard MTD partitions except it can override
1281 + * NAND chip ECC handling.
1282 + * This is particularly useful for SoCs that need specific ECC configs to boot
1283 + * from NAND while these ECC configs do not fit the NAND chip ECC requirements.
1284 + */
1285 +struct nand_part {
1286 +       struct list_head node;
1287 +       struct mtd_info mtd;
1288 +       struct mtd_info *master;
1289 +       uint64_t offset;
1290 +       struct nand_ecc_ctrl *ecc;
1291 +       void (*release)(struct nand_part *part);
1292 +};
1293 +
1294 +static inline struct nand_part *to_nand_part(struct mtd_info *mtd)
1295 +{
1296 +       return container_of(mtd, struct nand_part, mtd);
1297 +}
1298 +
1299 +int nand_add_partition(struct mtd_info *master, struct nand_part *part);
1300 +
1301 +void nand_del_partition(struct nand_part *part);
1302 +
1303 +struct nand_part *nandpart_alloc(void);
1304 +
1305  /*
1306   * NAND Flash Manufacturer ID Codes
1307   */