drivers/mtd/nand/nand_util.c

   1 /*
   2  * drivers/mtd/nand/nand_util.c
   3  *
   4  * Copyright (C) 2006 by Weiss-Electronic GmbH.
   5  * All rights reserved.
   6  *
   7  * @author:     Guido Classen <clagix@gmail.com>
   8  * @descr:      NAND Flash support
   9  * @references: borrowed heavily from Linux mtd-utils code:
  10  *              flash_eraseall.c by Arcom Control System Ltd
  11  *              nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com)
  12  *                             and Thomas Gleixner (tglx@linutronix.de)
  13  *
  14  * See file CREDITS for list of people who contributed to this
  15  * project.
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License version
  19  * 2 as published by the Free Software Foundation.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  * MA 02111-1307 USA
  30  *
  31  */
  32
  33 #include <common.h>
  34
  35 #if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
  36
  37 #include <command.h>
  38 #include <watchdog.h>
  39 #include <malloc.h>
  40 #include <div64.h>
  41
  42 #include <nand.h>
  43 #include <jffs2/jffs2.h>
  44
  45 typedef struct erase_info erase_info_t;
  46 typedef struct mtd_info   mtd_info_t;
  47
  48 /* support only for native endian JFFS2 */
  49 #define cpu_to_je16(x) (x)
  50 #define cpu_to_je32(x) (x)
  51
  52 /*****************************************************************************/
  53 static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip)
  54 {
  55         return 0;
  56 }
  57
  58 /**
  59  * nand_erase_opts: - erase NAND flash with support for various options
  60  *                    (jffs2 formating)
  61  *
  62  * @param meminfo       NAND device to erase
  63  * @param opts          options,  @see struct nand_erase_options
  64  * @return              0 in case of success
  65  *
  66  * This code is ported from flash_eraseall.c from Linux mtd utils by
  67  * Arcom Control System Ltd.
  68  */
  69 int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
  70 {
  71         struct jffs2_unknown_node cleanmarker;
  72         int clmpos = 0;
  73         int clmlen = 8;
  74         erase_info_t erase;
  75         ulong erase_length;
  76         int isNAND;
  77         int bbtest = 1;
  78         int result;
  79         int percent_complete = -1;
  80         int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL;
  81         const char *mtd_device = meminfo->name;
  82
  83         memset(&erase, 0, sizeof(erase));
  84
  85         erase.mtd = meminfo;
  86         erase.len  = meminfo->erasesize;
  87         erase.addr = opts->offset;
  88         erase_length = opts->length;
  89
  90         isNAND = meminfo->type == MTD_NANDFLASH ? 1 : 0;
  91
  92         if (opts->jffs2) {
  93                 cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
  94                 cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
  95                 if (isNAND) {
  96                         struct nand_oobinfo *oobinfo = &meminfo->oobinfo;
  97
  98                         /* check for autoplacement */
  99                         if (oobinfo->useecc == MTD_NANDECC_AUTOPLACE) {
 100                                 /* get the position of the free bytes */
 101                                 if (!oobinfo->oobfree[0][1]) {
 102                                         printf(" Eeep. Autoplacement selected "
 103                                                "and no empty space in oob\n");
 104                                         return -1;
 105                                 }
 106                                 clmpos = oobinfo->oobfree[0][0];
 107                                 clmlen = oobinfo->oobfree[0][1];
 108                                 if (clmlen > 8)
 109                                         clmlen = 8;
 110                         } else {
 111                                 /* legacy mode */
 112                                 switch (meminfo->oobsize) {
 113                                 case 8:
 114                                         clmpos = 6;
 115                                         clmlen = 2;
 116                                         break;
 117                                 case 16:
 118                                         clmpos = 8;
 119                                         clmlen = 8;
 120                                         break;
 121                                 case 64:
 122                                         clmpos = 16;
 123                                         clmlen = 8;
 124                                         break;
 125                                 }
 126                         }
 127
 128                         cleanmarker.totlen = cpu_to_je32(8);
 129                 } else {
 130                         cleanmarker.totlen =
 131                                 cpu_to_je32(sizeof(struct jffs2_unknown_node));
 132                 }
 133                 cleanmarker.hdr_crc =  cpu_to_je32(
 134                         crc32_no_comp(0, (unsigned char *) &cleanmarker,
 135                                       sizeof(struct jffs2_unknown_node) - 4));
 136         }
 137
 138         /* scrub option allows to erase badblock. To prevent internal
 139          * check from erase() method, set block check method to dummy
 140          * and disable bad block table while erasing.
 141          */
 142         if (opts->scrub) {
 143                 struct nand_chip *priv_nand = meminfo->priv;
 144
 145                 nand_block_bad_old = priv_nand->block_bad;
 146                 priv_nand->block_bad = nand_block_bad_scrub;
 147                 /* we don't need the bad block table anymore...
 148                  * after scrub, there are no bad blocks left!
 149                  */
 150                 if (priv_nand->bbt) {
 151                         kfree(priv_nand->bbt);
 152                 }
 153                 priv_nand->bbt = NULL;
 154         }
 155
 156         if (erase_length < meminfo->erasesize) {
 157                 printf("Warning: Erase size 0x%08x smaller than one "   \
 158                        "erase block 0x%08x\n",erase_length, meminfo->erasesize);
 159                 printf("         Erasing 0x%08x instead\n", meminfo->erasesize);
 160                 erase_length = meminfo->erasesize;
 161         }
 162
 163         for (;
 164              erase.addr < opts->offset + erase_length;
 165              erase.addr += meminfo->erasesize) {
 166
 167                 WATCHDOG_RESET ();
 168
 169                 if (!opts->scrub && bbtest) {
 170                         int ret = meminfo->block_isbad(meminfo, erase.addr);
 171                         if (ret > 0) {
 172                                 if (!opts->quiet)
 173                                         printf("\rSkipping bad block at  "
 174                                                "0x%08x                   "
 175                                                "                         \n",
 176                                                erase.addr);
 177                                 continue;
 178
 179                         } else if (ret < 0) {
 180                                 printf("\n%s: MTD get bad block failed: %d\n",
 181                                        mtd_device,
 182                                        ret);
 183                                 return -1;
 184                         }
 185                 }
 186
 187                 result = meminfo->erase(meminfo, &erase);
 188                 if (result != 0) {
 189                         printf("\n%s: MTD Erase failure: %d\n",
 190                                mtd_device, result);
 191                         continue;
 192                 }
 193
 194                 /* format for JFFS2 ? */
 195                 if (opts->jffs2) {
 196
 197                         /* write cleanmarker */
 198                         if (isNAND) {
 199                                 size_t written;
 200                                 result = meminfo->write_oob(meminfo,
 201                                                             erase.addr + clmpos,
 202                                                             clmlen,
 203                                                             &written,
 204                                                             (unsigned char *)
 205                                                             &cleanmarker);
 206                                 if (result != 0) {
 207                                         printf("\n%s: MTD writeoob failure: %d\n",
 208                                                mtd_device, result);
 209                                         continue;
 210                                 }
 211                         } else {
 212                                 printf("\n%s: this erase routine only supports"
 213                                        " NAND devices!\n",
 214                                        mtd_device);
 215                         }
 216                 }
 217
 218                 if (!opts->quiet) {
 219                         unsigned long long n =(unsigned long long)
 220                                 (erase.addr + meminfo->erasesize - opts->offset)
 221                                 * 100;
 222                         int percent;
 223
 224                         do_div(n, erase_length);
 225                         percent = (int)n;
 226
 227                         /* output progress message only at whole percent
 228                          * steps to reduce the number of messages printed
 229                          * on (slow) serial consoles
 230                          */
 231                         if (percent != percent_complete) {
 232                                 percent_complete = percent;
 233
 234                                 printf("\rErasing at 0x%x -- %3d%% complete.",
 235                                        erase.addr, percent);
 236
 237                                 if (opts->jffs2 && result == 0)
 238                                         printf(" Cleanmarker written at 0x%x.",
 239                                                erase.addr);
 240                         }
 241                 }
 242         }
 243         if (!opts->quiet)
 244                 printf("\n");
 245
 246         if (nand_block_bad_old) {
 247                 struct nand_chip *priv_nand = meminfo->priv;
 248
 249                 priv_nand->block_bad = nand_block_bad_old;
 250                 priv_nand->scan_bbt(meminfo);
 251         }
 252
 253         return 0;
 254 }
 255
 256 #define MAX_PAGE_SIZE   2048
 257 #define MAX_OOB_SIZE    64
 258
 259 /*
 260  * buffer array used for writing data
 261  */
 262 static unsigned char data_buf[MAX_PAGE_SIZE];
 263 static unsigned char oob_buf[MAX_OOB_SIZE];
 264
 265 /* OOB layouts to pass into the kernel as default */
 266 static struct nand_oobinfo none_oobinfo = {
 267         .useecc = MTD_NANDECC_OFF,
 268 };
 269
 270 static struct nand_oobinfo jffs2_oobinfo = {
 271         .useecc = MTD_NANDECC_PLACE,
 272         .eccbytes = 6,
 273         .eccpos = { 0, 1, 2, 3, 6, 7 }
 274 };
 275
 276 static struct nand_oobinfo yaffs_oobinfo = {
 277         .useecc = MTD_NANDECC_PLACE,
 278         .eccbytes = 6,
 279         .eccpos = { 8, 9, 10, 13, 14, 15}
 280 };
 281
 282 static struct nand_oobinfo autoplace_oobinfo = {
 283         .useecc = MTD_NANDECC_AUTOPLACE
 284 };
 285
 286 /**
 287  * nand_write_opts: - write image to NAND flash with support for various options
 288  *
 289  * @param meminfo       NAND device to erase
 290  * @param opts          write options (@see nand_write_options)
 291  * @return              0 in case of success
 292  *
 293  * This code is ported from nandwrite.c from Linux mtd utils by
 294  * Steven J. Hill and Thomas Gleixner.
 295  */
 296 int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts)
 297 {
 298         int imglen = 0;
 299         int pagelen;
 300         int baderaseblock;
 301         int blockstart = -1;
 302         loff_t offs;
 303         int readlen;
 304         int oobinfochanged = 0;
 305         int percent_complete = -1;
 306         struct nand_oobinfo old_oobinfo;
 307         ulong mtdoffset = opts->offset;
 308         ulong erasesize_blockalign;
 309         u_char *buffer = opts->buffer;
 310         size_t written;
 311         int result;
 312
 313         if (opts->pad && opts->writeoob) {
 314                 printf("Can't pad when oob data is present.\n");
 315                 return -1;
 316         }
 317
 318         /* set erasesize to specified number of blocks - to match
 319          * jffs2 (virtual) block size */
 320         if (opts->blockalign == 0) {
 321                 erasesize_blockalign = meminfo->erasesize;
 322         } else {
 323                 erasesize_blockalign = meminfo->erasesize * opts->blockalign;
 324         }
 325
 326         /* make sure device page sizes are valid */
 327         if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
 328             && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
 329             && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
 330                 printf("Unknown flash (not normal NAND)\n");
 331                 return -1;
 332         }
 333
 334         /* read the current oob info */
 335         memcpy(&old_oobinfo, &meminfo->oobinfo, sizeof(old_oobinfo));
 336
 337         /* write without ecc? */
 338         if (opts->noecc) {
 339                 memcpy(&meminfo->oobinfo, &none_oobinfo,
 340                        sizeof(meminfo->oobinfo));
 341                 oobinfochanged = 1;
 342         }
 343
 344         /* autoplace ECC? */
 345         if (opts->autoplace && (old_oobinfo.useecc != MTD_NANDECC_AUTOPLACE)) {
 346
 347                 memcpy(&meminfo->oobinfo, &autoplace_oobinfo,
 348                        sizeof(meminfo->oobinfo));
 349                 oobinfochanged = 1;
 350         }
 351
 352         /* force OOB layout for jffs2 or yaffs? */
 353         if (opts->forcejffs2 || opts->forceyaffs) {
 354                 struct nand_oobinfo *oobsel =
 355                         opts->forcejffs2 ? &jffs2_oobinfo : &yaffs_oobinfo;
 356
 357                 if (meminfo->oobsize == 8) {
 358                         if (opts->forceyaffs) {
 359                                 printf("YAFSS cannot operate on "
 360                                        "256 Byte page size\n");
 361                                 goto restoreoob;
 362                         }
 363                         /* Adjust number of ecc bytes */
 364                         jffs2_oobinfo.eccbytes = 3;
 365                 }
 366
 367                 memcpy(&meminfo->oobinfo, oobsel, sizeof(meminfo->oobinfo));
 368         }
 369
 370         /* get image length */
 371         imglen = opts->length;
 372         pagelen = meminfo->oobblock
 373                 + ((opts->writeoob != 0) ? meminfo->oobsize : 0);
 374
 375         /* check, if file is pagealigned */
 376         if ((!opts->pad) && ((imglen % pagelen) != 0)) {
 377                 printf("Input block length is not page aligned\n");
 378                 goto restoreoob;
 379         }
 380
 381         /* check, if length fits into device */
 382         if (((imglen / pagelen) * meminfo->oobblock)
 383              > (meminfo->size - opts->offset)) {
 384                 printf("Image %d bytes, NAND page %d bytes, "
 385                        "OOB area %u bytes, device size %u bytes\n",
 386                        imglen, pagelen, meminfo->oobblock, meminfo->size);
 387                 printf("Input block does not fit into device\n");
 388                 goto restoreoob;
 389         }
 390
 391         if (!opts->quiet)
 392                 printf("\n");
 393
 394         /* get data from input and write to the device */
 395         while (imglen && (mtdoffset < meminfo->size)) {
 396
 397                 WATCHDOG_RESET ();
 398
 399                 /*
 400                  * new eraseblock, check for bad block(s). Stay in the
 401                  * loop to be sure if the offset changes because of
 402                  * a bad block, that the next block that will be
 403                  * written to is also checked. Thus avoiding errors if
 404                  * the block(s) after the skipped block(s) is also bad
 405                  * (number of blocks depending on the blockalign
 406                  */
 407                 while (blockstart != (mtdoffset & (~erasesize_blockalign+1))) {
 408                         blockstart = mtdoffset & (~erasesize_blockalign+1);
 409                         offs = blockstart;
 410                         baderaseblock = 0;
 411
 412                         /* check all the blocks in an erase block for
 413                          * bad blocks */
 414                         do {
 415                                 int ret = meminfo->block_isbad(meminfo, offs);
 416
 417                                 if (ret < 0) {
 418                                         printf("Bad block check failed\n");
 419                                         goto restoreoob;
 420                                 }
 421                                 if (ret == 1) {
 422                                         baderaseblock = 1;
 423                                         if (!opts->quiet)
 424                                                 printf("\rBad block at 0x%lx "
 425                                                        "in erase block from "
 426                                                        "0x%x will be skipped\n",
 427                                                        (long) offs,
 428                                                        blockstart);
 429                                 }
 430
 431                                 if (baderaseblock) {
 432                                         mtdoffset = blockstart
 433                                                 + erasesize_blockalign;
 434                                 }
 435                                 offs +=  erasesize_blockalign
 436                                         / opts->blockalign;
 437                         } while (offs < blockstart + erasesize_blockalign);
 438                 }
 439
 440                 readlen = meminfo->oobblock;
 441                 if (opts->pad && (imglen < readlen)) {
 442                         readlen = imglen;
 443                         memset(data_buf + readlen, 0xff,
 444                                meminfo->oobblock - readlen);
 445                 }
 446
 447                 /* read page data from input memory buffer */
 448                 memcpy(data_buf, buffer, readlen);
 449                 buffer += readlen;
 450
 451                 if (opts->writeoob) {
 452                         /* read OOB data from input memory block, exit
 453                          * on failure */
 454                         memcpy(oob_buf, buffer, meminfo->oobsize);
 455                         buffer += meminfo->oobsize;
 456
 457                         /* write OOB data first, as ecc will be placed
 458                          * in there*/
 459                         result = meminfo->write_oob(meminfo,
 460                                                     mtdoffset,
 461                                                     meminfo->oobsize,
 462                                                     &written,
 463                                                     (unsigned char *)
 464                                                     &oob_buf);
 465
 466                         if (result != 0) {
 467                                 printf("\nMTD writeoob failure: %d\n",
 468                                        result);
 469                                 goto restoreoob;
 470                         }
 471                         imglen -= meminfo->oobsize;
 472                 }
 473
 474                 /* write out the page data */
 475                 result = meminfo->write(meminfo,
 476                                         mtdoffset,
 477                                         meminfo->oobblock,
 478                                         &written,
 479                                         (unsigned char *) &data_buf);
 480
 481                 if (result != 0) {
 482                         printf("writing NAND page at offset 0x%lx failed\n",
 483                                mtdoffset);
 484                         goto restoreoob;
 485                 }
 486                 imglen -= readlen;
 487
 488                 if (!opts->quiet) {
 489                         unsigned long long n = (unsigned long long)
 490                                  (opts->length-imglen) * 100;
 491                         int percent;
 492
 493                         do_div(n, opts->length);
 494                         percent = (int)n;
 495
 496                         /* output progress message only at whole percent
 497                          * steps to reduce the number of messages printed
 498                          * on (slow) serial consoles
 499                          */
 500                         if (percent != percent_complete) {
 501                                 printf("\rWriting data at 0x%x "
 502                                        "-- %3d%% complete.",
 503                                        mtdoffset, percent);
 504                                 percent_complete = percent;
 505                         }
 506                 }
 507
 508                 mtdoffset += meminfo->oobblock;
 509         }
 510
 511         if (!opts->quiet)
 512                 printf("\n");
 513
 514 restoreoob:
 515         if (oobinfochanged) {
 516                 memcpy(&meminfo->oobinfo, &old_oobinfo,
 517                        sizeof(meminfo->oobinfo));
 518         }
 519
 520         if (imglen > 0) {
 521                 printf("Data did not fit into device, due to bad blocks\n");
 522                 return -1;
 523         }
 524
 525         /* return happy */
 526         return 0;
 527 }
 528
 529 /**
 530  * nand_read_opts: - read image from NAND flash with support for various options
 531  *
 532  * @param meminfo       NAND device to erase
 533  * @param opts          read options (@see struct nand_read_options)
 534  * @return              0 in case of success
 535  *
 536  */
 537 int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts)
 538 {
 539         int imglen = opts->length;
 540         int pagelen;
 541         int baderaseblock;
 542         int blockstart = -1;
 543         int percent_complete = -1;
 544         loff_t offs;
 545         size_t readlen;
 546         ulong mtdoffset = opts->offset;
 547         u_char *buffer = opts->buffer;
 548         int result;
 549
 550         /* make sure device page sizes are valid */
 551         if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
 552             && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
 553             && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
 554                 printf("Unknown flash (not normal NAND)\n");
 555                 return -1;
 556         }
 557
 558         pagelen = meminfo->oobblock
 559                 + ((opts->readoob != 0) ? meminfo->oobsize : 0);
 560
 561         /* check, if length is not larger than device */
 562         if (((imglen / pagelen) * meminfo->oobblock)
 563              > (meminfo->size - opts->offset)) {
 564                 printf("Image %d bytes, NAND page %d bytes, "
 565                        "OOB area %u bytes, device size %u bytes\n",
 566                        imglen, pagelen, meminfo->oobblock, meminfo->size);
 567                 printf("Input block is larger than device\n");
 568                 return -1;
 569         }
 570
 571         if (!opts->quiet)
 572                 printf("\n");
 573
 574         /* get data from input and write to the device */
 575         while (imglen && (mtdoffset < meminfo->size)) {
 576
 577                 WATCHDOG_RESET ();
 578
 579                 /*
 580                  * new eraseblock, check for bad block(s). Stay in the
 581                  * loop to be sure if the offset changes because of
 582                  * a bad block, that the next block that will be
 583                  * written to is also checked. Thus avoiding errors if
 584                  * the block(s) after the skipped block(s) is also bad
 585                  * (number of blocks depending on the blockalign
 586                  */
 587                 while (blockstart != (mtdoffset & (~meminfo->erasesize+1))) {
 588                         blockstart = mtdoffset & (~meminfo->erasesize+1);
 589                         offs = blockstart;
 590                         baderaseblock = 0;
 591
 592                         /* check all the blocks in an erase block for
 593                          * bad blocks */
 594                         do {
 595                                 int ret = meminfo->block_isbad(meminfo, offs);
 596
 597                                 if (ret < 0) {
 598                                         printf("Bad block check failed\n");
 599                                         return -1;
 600                                 }
 601                                 if (ret == 1) {
 602                                         baderaseblock = 1;
 603                                         if (!opts->quiet)
 604                                                 printf("\rBad block at 0x%lx "
 605                                                        "in erase block from "
 606                                                        "0x%x will be skipped\n",
 607                                                        (long) offs,
 608                                                        blockstart);
 609                                 }
 610
 611                                 if (baderaseblock) {
 612                                         mtdoffset = blockstart
 613                                                 + meminfo->erasesize;
 614                                 }
 615                                 offs +=  meminfo->erasesize;
 616
 617                         } while (offs < blockstart + meminfo->erasesize);
 618                 }
 619
 620
 621                 /* read page data to memory buffer */
 622                 result = meminfo->read(meminfo,
 623                                        mtdoffset,
 624                                        meminfo->oobblock,
 625                                        &readlen,
 626                                        (unsigned char *) &data_buf);
 627
 628                 if (result != 0) {
 629                         printf("reading NAND page at offset 0x%lx failed\n",
 630                                mtdoffset);
 631                         return -1;
 632                 }
 633
 634                 if (imglen < readlen) {
 635                         readlen = imglen;
 636                 }
 637
 638                 memcpy(buffer, data_buf, readlen);
 639                 buffer += readlen;
 640                 imglen -= readlen;
 641
 642                 if (opts->readoob) {
 643                         result = meminfo->read_oob(meminfo,
 644                                                    mtdoffset,
 645                                                    meminfo->oobsize,
 646                                                    &readlen,
 647                                                    (unsigned char *)
 648                                                    &oob_buf);
 649
 650                         if (result != 0) {
 651                                 printf("\nMTD readoob failure: %d\n",
 652                                        result);
 653                                 return -1;
 654                         }
 655
 656
 657                         if (imglen < readlen) {
 658                                 readlen = imglen;
 659                         }
 660
 661                         memcpy(buffer, oob_buf, readlen);
 662
 663                         buffer += readlen;
 664                         imglen -= readlen;
 665                 }
 666
 667                 if (!opts->quiet) {
 668                         unsigned long long n = (unsigned long long)
 669                                  (opts->length-imglen) * 100;
 670                         int percent;
 671
 672                         do_div(n, opts->length);
 673                         percent = (int)n;
 674
 675                         /* output progress message only at whole percent
 676                          * steps to reduce the number of messages printed
 677                          * on (slow) serial consoles
 678                          */
 679                         if (percent != percent_complete) {
 680                         if (!opts->quiet)
 681                                 printf("\rReading data from 0x%x "
 682                                        "-- %3d%% complete.",
 683                                        mtdoffset, percent);
 684                                 percent_complete = percent;
 685                         }
 686                 }
 687
 688                 mtdoffset += meminfo->oobblock;
 689         }
 690
 691         if (!opts->quiet)
 692                 printf("\n");
 693
 694         if (imglen > 0) {
 695                 printf("Could not read entire image due to bad blocks\n");
 696                 return -1;
 697         }
 698
 699         /* return happy */
 700         return 0;
 701 }
 702
 703 /******************************************************************************
 704  * Support for locking / unlocking operations of some NAND devices
 705  *****************************************************************************/
 706
 707 #define NAND_CMD_LOCK           0x2a
 708 #define NAND_CMD_LOCK_TIGHT     0x2c
 709 #define NAND_CMD_UNLOCK1        0x23
 710 #define NAND_CMD_UNLOCK2        0x24
 711 #define NAND_CMD_LOCK_STATUS    0x7a
 712
 713 /**
 714  * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
 715  *            state
 716  *
 717  * @param meminfo       nand mtd instance
 718  * @param tight         bring device in lock tight mode
 719  *
 720  * @return              0 on success, -1 in case of error
 721  *
 722  * The lock / lock-tight command only applies to the whole chip. To get some
 723  * parts of the chip lock and others unlocked use the following sequence:
 724  *
 725  * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
 726  * - Call nand_unlock() once for each consecutive area to be unlocked
 727  * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
 728  *
 729  *   If the device is in lock-tight state software can't change the
 730  *   current active lock/unlock state of all pages. nand_lock() / nand_unlock()
 731  *   calls will fail. It is only posible to leave lock-tight state by
 732  *   an hardware signal (low pulse on _WP pin) or by power down.
 733  */
 734 int nand_lock(nand_info_t *meminfo, int tight)
 735 {
 736         int ret = 0;
 737         int status;
 738         struct nand_chip *this = meminfo->priv;
 739
 740         /* select the NAND device */
 741         this->select_chip(meminfo, 0);
 742
 743         this->cmdfunc(meminfo,
 744                       (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
 745                       -1, -1);
 746
 747         /* call wait ready function */
 748         status = this->waitfunc(meminfo, this, FL_WRITING);
 749
 750         /* see if device thinks it succeeded */
 751         if (status & 0x01) {
 752                 ret = -1;
 753         }
 754
 755         /* de-select the NAND device */
 756         this->select_chip(meminfo, -1);
 757         return ret;
 758 }
 759
 760 /**
 761  * nand_get_lock_status: - query current lock state from one page of NAND
 762  *                         flash
 763  *
 764  * @param meminfo       nand mtd instance
 765  * @param offset        page address to query (muss be page aligned!)
 766  *
 767  * @return              -1 in case of error
 768  *                      >0 lock status:
 769  *                        bitfield with the following combinations:
 770  *                        NAND_LOCK_STATUS_TIGHT: page in tight state
 771  *                        NAND_LOCK_STATUS_LOCK:  page locked
 772  *                        NAND_LOCK_STATUS_UNLOCK: page unlocked
 773  *
 774  */
 775 int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
 776 {
 777         int ret = 0;
 778         int chipnr;
 779         int page;
 780         struct nand_chip *this = meminfo->priv;
 781
 782         /* select the NAND device */
 783         chipnr = (int)(offset >> this->chip_shift);
 784         this->select_chip(meminfo, chipnr);
 785
 786
 787         if ((offset & (meminfo->oobblock - 1)) != 0) {
 788                 printf ("nand_get_lock_status: "
 789                         "Start address must be beginning of "
 790                         "nand page!\n");
 791                 ret = -1;
 792                 goto out;
 793         }
 794
 795         /* check the Lock Status */
 796         page = (int)(offset >> this->page_shift);
 797         this->cmdfunc(meminfo, NAND_CMD_LOCK_STATUS, -1, page & this->pagemask);
 798
 799         ret = this->read_byte(meminfo) & (NAND_LOCK_STATUS_TIGHT
 800                                           | NAND_LOCK_STATUS_LOCK
 801                                           | NAND_LOCK_STATUS_UNLOCK);
 802
 803  out:
 804         /* de-select the NAND device */
 805         this->select_chip(meminfo, -1);
 806         return ret;
 807 }
 808
 809 /**
 810  * nand_unlock: - Unlock area of NAND pages
 811  *                only one consecutive area can be unlocked at one time!
 812  *
 813  * @param meminfo       nand mtd instance
 814  * @param start         start byte address
 815  * @param length        number of bytes to unlock (must be a multiple of
 816  *                      page size nand->oobblock)
 817  *
 818  * @return              0 on success, -1 in case of error
 819  */
 820 int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
 821 {
 822         int ret = 0;
 823         int chipnr;
 824         int status;
 825         int page;
 826         struct nand_chip *this = meminfo->priv;
 827         printf ("nand_unlock: start: %08x, length: %d!\n",
 828                 (int)start, (int)length);
 829
 830         /* select the NAND device */
 831         chipnr = (int)(start >> this->chip_shift);
 832         this->select_chip(meminfo, chipnr);
 833
 834         /* check the WP bit */
 835         this->cmdfunc(meminfo, NAND_CMD_STATUS, -1, -1);
 836         if ((this->read_byte(meminfo) & 0x80) == 0) {
 837                 printf ("nand_unlock: Device is write protected!\n");
 838                 ret = -1;
 839                 goto out;
 840         }
 841
 842         if ((start & (meminfo->oobblock - 1)) != 0) {
 843                 printf ("nand_unlock: Start address must be beginning of "
 844                         "nand page!\n");
 845                 ret = -1;
 846                 goto out;
 847         }
 848
 849         if (length == 0 || (length & (meminfo->oobblock - 1)) != 0) {
 850                 printf ("nand_unlock: Length must be a multiple of nand page "
 851                         "size!\n");
 852                 ret = -1;
 853                 goto out;
 854         }
 855
 856         /* submit address of first page to unlock */
 857         page = (int)(start >> this->page_shift);
 858         this->cmdfunc(meminfo, NAND_CMD_UNLOCK1, -1, page & this->pagemask);
 859
 860         /* submit ADDRESS of LAST page to unlock */
 861         page += (int)(length >> this->page_shift) - 1;
 862         this->cmdfunc(meminfo, NAND_CMD_UNLOCK2, -1, page & this->pagemask);
 863
 864         /* call wait ready function */
 865         status = this->waitfunc(meminfo, this, FL_WRITING);
 866         /* see if device thinks it succeeded */
 867         if (status & 0x01) {
 868                 /* there was an error */
 869                 ret = -1;
 870                 goto out;
 871         }
 872
 873  out:
 874         /* de-select the NAND device */
 875         this->select_chip(meminfo, -1);
 876         return ret;
 877 }
 878
 879 #endif