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         for (;
 157              erase.addr < opts->offset + erase_length;
 158              erase.addr += meminfo->erasesize) {
 159
 160                 WATCHDOG_RESET ();
 161
 162                 if (!opts->scrub && bbtest) {
 163                         int ret = meminfo->block_isbad(meminfo, erase.addr);
 164                         if (ret > 0) {
 165                                 if (!opts->quiet)
 166                                         printf("\rSkipping bad block at  "
 167                                                "0x%08x                   "
 168                                                "                         \n",
 169                                                erase.addr);
 170                                 continue;
 171
 172                         } else if (ret < 0) {
 173                                 printf("\n%s: MTD get bad block failed: %d\n",
 174                                        mtd_device,
 175                                        ret);
 176                                 return -1;
 177                         }
 178                 }
 179
 180                 result = meminfo->erase(meminfo, &erase);
 181                 if (result != 0) {
 182                         printf("\n%s: MTD Erase failure: %d\n",
 183                                mtd_device, result);
 184                         continue;
 185                 }
 186
 187                 /* format for JFFS2 ? */
 188                 if (opts->jffs2) {
 189
 190                         /* write cleanmarker */
 191                         if (isNAND) {
 192                                 size_t written;
 193                                 result = meminfo->write_oob(meminfo,
 194                                                             erase.addr + clmpos,
 195                                                             clmlen,
 196                                                             &written,
 197                                                             (unsigned char *)
 198                                                             &cleanmarker);
 199                                 if (result != 0) {
 200                                         printf("\n%s: MTD writeoob failure: %d\n",
 201                                                mtd_device, result);
 202                                         continue;
 203                                 }
 204                         } else {
 205                                 printf("\n%s: this erase routine only supports"
 206                                        " NAND devices!\n",
 207                                        mtd_device);
 208                         }
 209                 }
 210
 211                 if (!opts->quiet) {
 212                         unsigned long long n =(unsigned long long)
 213                                 (erase.addr + meminfo->erasesize - opts->offset)
 214                                 * 100;
 215                         int percent;
 216
 217                         do_div(n, erase_length);
 218                         percent = (int)n;
 219
 220                         /* output progress message only at whole percent
 221                          * steps to reduce the number of messages printed
 222                          * on (slow) serial consoles
 223                          */
 224                         if (percent != percent_complete) {
 225                                 percent_complete = percent;
 226
 227                                 printf("\rErasing at 0x%x -- %3d%% complete.",
 228                                        erase.addr, percent);
 229
 230                                 if (opts->jffs2 && result == 0)
 231                                         printf(" Cleanmarker written at 0x%x.",
 232                                                erase.addr);
 233                         }
 234                 }
 235         }
 236         if (!opts->quiet)
 237                 printf("\n");
 238
 239         if (nand_block_bad_old) {
 240                 struct nand_chip *priv_nand = meminfo->priv;
 241
 242                 priv_nand->block_bad = nand_block_bad_old;
 243                 priv_nand->scan_bbt(meminfo);
 244         }
 245
 246         return 0;
 247 }
 248
 249 #define MAX_PAGE_SIZE   2048
 250 #define MAX_OOB_SIZE    64
 251
 252 /*
 253  * buffer array used for writing data
 254  */
 255 static unsigned char data_buf[MAX_PAGE_SIZE];
 256 static unsigned char oob_buf[MAX_OOB_SIZE];
 257
 258 /* OOB layouts to pass into the kernel as default */
 259 static struct nand_oobinfo none_oobinfo = {
 260         .useecc = MTD_NANDECC_OFF,
 261 };
 262
 263 static struct nand_oobinfo jffs2_oobinfo = {
 264         .useecc = MTD_NANDECC_PLACE,
 265         .eccbytes = 6,
 266         .eccpos = { 0, 1, 2, 3, 6, 7 }
 267 };
 268
 269 static struct nand_oobinfo yaffs_oobinfo = {
 270         .useecc = MTD_NANDECC_PLACE,
 271         .eccbytes = 6,
 272         .eccpos = { 8, 9, 10, 13, 14, 15}
 273 };
 274
 275 static struct nand_oobinfo autoplace_oobinfo = {
 276         .useecc = MTD_NANDECC_AUTOPLACE
 277 };
 278
 279 /**
 280  * nand_write_opts: - write image to NAND flash with support for various options
 281  *
 282  * @param meminfo       NAND device to erase
 283  * @param opts          write options (@see nand_write_options)
 284  * @return              0 in case of success
 285  *
 286  * This code is ported from nandwrite.c from Linux mtd utils by
 287  * Steven J. Hill and Thomas Gleixner.
 288  */
 289 int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts)
 290 {
 291         int imglen = 0;
 292         int pagelen;
 293         int baderaseblock;
 294         int blockstart = -1;
 295         loff_t offs;
 296         int readlen;
 297         int oobinfochanged = 0;
 298         int percent_complete = -1;
 299         struct nand_oobinfo old_oobinfo;
 300         ulong mtdoffset = opts->offset;
 301         ulong erasesize_blockalign;
 302         u_char *buffer = opts->buffer;
 303         size_t written;
 304         int result;
 305
 306         if (opts->pad && opts->writeoob) {
 307                 printf("Can't pad when oob data is present.\n");
 308                 return -1;
 309         }
 310
 311         /* set erasesize to specified number of blocks - to match
 312          * jffs2 (virtual) block size */
 313         if (opts->blockalign == 0) {
 314                 erasesize_blockalign = meminfo->erasesize;
 315         } else {
 316                 erasesize_blockalign = meminfo->erasesize * opts->blockalign;
 317         }
 318
 319         /* make sure device page sizes are valid */
 320         if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
 321             && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
 322             && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
 323                 printf("Unknown flash (not normal NAND)\n");
 324                 return -1;
 325         }
 326
 327         /* read the current oob info */
 328         memcpy(&old_oobinfo, &meminfo->oobinfo, sizeof(old_oobinfo));
 329
 330         /* write without ecc? */
 331         if (opts->noecc) {
 332                 memcpy(&meminfo->oobinfo, &none_oobinfo,
 333                        sizeof(meminfo->oobinfo));
 334                 oobinfochanged = 1;
 335         }
 336
 337         /* autoplace ECC? */
 338         if (opts->autoplace && (old_oobinfo.useecc != MTD_NANDECC_AUTOPLACE)) {
 339
 340                 memcpy(&meminfo->oobinfo, &autoplace_oobinfo,
 341                        sizeof(meminfo->oobinfo));
 342                 oobinfochanged = 1;
 343         }
 344
 345         /* force OOB layout for jffs2 or yaffs? */
 346         if (opts->forcejffs2 || opts->forceyaffs) {
 347                 struct nand_oobinfo *oobsel =
 348                         opts->forcejffs2 ? &jffs2_oobinfo : &yaffs_oobinfo;
 349
 350                 if (meminfo->oobsize == 8) {
 351                         if (opts->forceyaffs) {
 352                                 printf("YAFSS cannot operate on "
 353                                        "256 Byte page size\n");
 354                                 goto restoreoob;
 355                         }
 356                         /* Adjust number of ecc bytes */
 357                         jffs2_oobinfo.eccbytes = 3;
 358                 }
 359
 360                 memcpy(&meminfo->oobinfo, oobsel, sizeof(meminfo->oobinfo));
 361         }
 362
 363         /* get image length */
 364         imglen = opts->length;
 365         pagelen = meminfo->oobblock
 366                 + ((opts->writeoob != 0) ? meminfo->oobsize : 0);
 367
 368         /* check, if file is pagealigned */
 369         if ((!opts->pad) && ((imglen % pagelen) != 0)) {
 370                 printf("Input block length is not page aligned\n");
 371                 goto restoreoob;
 372         }
 373
 374         /* check, if length fits into device */
 375         if (((imglen / pagelen) * meminfo->oobblock)
 376              > (meminfo->size - opts->offset)) {
 377                 printf("Image %d bytes, NAND page %d bytes, "
 378                        "OOB area %u bytes, device size %u bytes\n",
 379                        imglen, pagelen, meminfo->oobblock, meminfo->size);
 380                 printf("Input block does not fit into device\n");
 381                 goto restoreoob;
 382         }
 383
 384         if (!opts->quiet)
 385                 printf("\n");
 386
 387         /* get data from input and write to the device */
 388         while (imglen && (mtdoffset < meminfo->size)) {
 389
 390                 WATCHDOG_RESET ();
 391
 392                 /*
 393                  * new eraseblock, check for bad block(s). Stay in the
 394                  * loop to be sure if the offset changes because of
 395                  * a bad block, that the next block that will be
 396                  * written to is also checked. Thus avoiding errors if
 397                  * the block(s) after the skipped block(s) is also bad
 398                  * (number of blocks depending on the blockalign
 399                  */
 400                 while (blockstart != (mtdoffset & (~erasesize_blockalign+1))) {
 401                         blockstart = mtdoffset & (~erasesize_blockalign+1);
 402                         offs = blockstart;
 403                         baderaseblock = 0;
 404
 405                         /* check all the blocks in an erase block for
 406                          * bad blocks */
 407                         do {
 408                                 int ret = meminfo->block_isbad(meminfo, offs);
 409
 410                                 if (ret < 0) {
 411                                         printf("Bad block check failed\n");
 412                                         goto restoreoob;
 413                                 }
 414                                 if (ret == 1) {
 415                                         baderaseblock = 1;
 416                                         if (!opts->quiet)
 417                                                 printf("\rBad block at 0x%lx "
 418                                                        "in erase block from "
 419                                                        "0x%x will be skipped\n",
 420                                                        (long) offs,
 421                                                        blockstart);
 422                                 }
 423
 424                                 if (baderaseblock) {
 425                                         mtdoffset = blockstart
 426                                                 + erasesize_blockalign;
 427                                 }
 428                                 offs +=  erasesize_blockalign
 429                                         / opts->blockalign;
 430                         } while (offs < blockstart + erasesize_blockalign);
 431                 }
 432
 433                 readlen = meminfo->oobblock;
 434                 if (opts->pad && (imglen < readlen)) {
 435                         readlen = imglen;
 436                         memset(data_buf + readlen, 0xff,
 437                                meminfo->oobblock - readlen);
 438                 }
 439
 440                 /* read page data from input memory buffer */
 441                 memcpy(data_buf, buffer, readlen);
 442                 buffer += readlen;
 443
 444                 if (opts->writeoob) {
 445                         /* read OOB data from input memory block, exit
 446                          * on failure */
 447                         memcpy(oob_buf, buffer, meminfo->oobsize);
 448                         buffer += meminfo->oobsize;
 449
 450                         /* write OOB data first, as ecc will be placed
 451                          * in there*/
 452                         result = meminfo->write_oob(meminfo,
 453                                                     mtdoffset,
 454                                                     meminfo->oobsize,
 455                                                     &written,
 456                                                     (unsigned char *)
 457                                                     &oob_buf);
 458
 459                         if (result != 0) {
 460                                 printf("\nMTD writeoob failure: %d\n",
 461                                        result);
 462                                 goto restoreoob;
 463                         }
 464                         imglen -= meminfo->oobsize;
 465                 }
 466
 467                 /* write out the page data */
 468                 result = meminfo->write(meminfo,
 469                                         mtdoffset,
 470                                         meminfo->oobblock,
 471                                         &written,
 472                                         (unsigned char *) &data_buf);
 473
 474                 if (result != 0) {
 475                         printf("writing NAND page at offset 0x%lx failed\n",
 476                                mtdoffset);
 477                         goto restoreoob;
 478                 }
 479                 imglen -= readlen;
 480
 481                 if (!opts->quiet) {
 482                         unsigned long long n = (unsigned long long)
 483                                  (opts->length-imglen) * 100;
 484                         int percent;
 485
 486                         do_div(n, opts->length);
 487                         percent = (int)n;
 488
 489                         /* output progress message only at whole percent
 490                          * steps to reduce the number of messages printed
 491                          * on (slow) serial consoles
 492                          */
 493                         if (percent != percent_complete) {
 494                                 printf("\rWriting data at 0x%x "
 495                                        "-- %3d%% complete.",
 496                                        mtdoffset, percent);
 497                                 percent_complete = percent;
 498                         }
 499                 }
 500
 501                 mtdoffset += meminfo->oobblock;
 502         }
 503
 504         if (!opts->quiet)
 505                 printf("\n");
 506
 507 restoreoob:
 508         if (oobinfochanged) {
 509                 memcpy(&meminfo->oobinfo, &old_oobinfo,
 510                        sizeof(meminfo->oobinfo));
 511         }
 512
 513         if (imglen > 0) {
 514                 printf("Data did not fit into device, due to bad blocks\n");
 515                 return -1;
 516         }
 517
 518         /* return happy */
 519         return 0;
 520 }
 521
 522 /**
 523  * nand_read_opts: - read image from NAND flash with support for various options
 524  *
 525  * @param meminfo       NAND device to erase
 526  * @param opts          read options (@see struct nand_read_options)
 527  * @return              0 in case of success
 528  *
 529  */
 530 int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts)
 531 {
 532         int imglen = opts->length;
 533         int pagelen;
 534         int baderaseblock;
 535         int blockstart = -1;
 536         int percent_complete = -1;
 537         loff_t offs;
 538         size_t readlen;
 539         ulong mtdoffset = opts->offset;
 540         u_char *buffer = opts->buffer;
 541         int result;
 542
 543         /* make sure device page sizes are valid */
 544         if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
 545             && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
 546             && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
 547                 printf("Unknown flash (not normal NAND)\n");
 548                 return -1;
 549         }
 550
 551         pagelen = meminfo->oobblock
 552                 + ((opts->readoob != 0) ? meminfo->oobsize : 0);
 553
 554         /* check, if length is not larger than device */
 555         if (((imglen / pagelen) * meminfo->oobblock)
 556              > (meminfo->size - opts->offset)) {
 557                 printf("Image %d bytes, NAND page %d bytes, "
 558                        "OOB area %u bytes, device size %u bytes\n",
 559                        imglen, pagelen, meminfo->oobblock, meminfo->size);
 560                 printf("Input block is larger than device\n");
 561                 return -1;
 562         }
 563
 564         if (!opts->quiet)
 565                 printf("\n");
 566
 567         /* get data from input and write to the device */
 568         while (imglen && (mtdoffset < meminfo->size)) {
 569
 570                 WATCHDOG_RESET ();
 571
 572                 /*
 573                  * new eraseblock, check for bad block(s). Stay in the
 574                  * loop to be sure if the offset changes because of
 575                  * a bad block, that the next block that will be
 576                  * written to is also checked. Thus avoiding errors if
 577                  * the block(s) after the skipped block(s) is also bad
 578                  * (number of blocks depending on the blockalign
 579                  */
 580                 while (blockstart != (mtdoffset & (~meminfo->erasesize+1))) {
 581                         blockstart = mtdoffset & (~meminfo->erasesize+1);
 582                         offs = blockstart;
 583                         baderaseblock = 0;
 584
 585                         /* check all the blocks in an erase block for
 586                          * bad blocks */
 587                         do {
 588                                 int ret = meminfo->block_isbad(meminfo, offs);
 589
 590                                 if (ret < 0) {
 591                                         printf("Bad block check failed\n");
 592                                         return -1;
 593                                 }
 594                                 if (ret == 1) {
 595                                         baderaseblock = 1;
 596                                         if (!opts->quiet)
 597                                                 printf("\rBad block at 0x%lx "
 598                                                        "in erase block from "
 599                                                        "0x%x will be skipped\n",
 600                                                        (long) offs,
 601                                                        blockstart);
 602                                 }
 603
 604                                 if (baderaseblock) {
 605                                         mtdoffset = blockstart
 606                                                 + meminfo->erasesize;
 607                                 }
 608                                 offs +=  meminfo->erasesize;
 609
 610                         } while (offs < blockstart + meminfo->erasesize);
 611                 }
 612
 613
 614                 /* read page data to memory buffer */
 615                 result = meminfo->read(meminfo,
 616                                        mtdoffset,
 617                                        meminfo->oobblock,
 618                                        &readlen,
 619                                        (unsigned char *) &data_buf);
 620
 621                 if (result != 0) {
 622                         printf("reading NAND page at offset 0x%lx failed\n",
 623                                mtdoffset);
 624                         return -1;
 625                 }
 626
 627                 if (imglen < readlen) {
 628                         readlen = imglen;
 629                 }
 630
 631                 memcpy(buffer, data_buf, readlen);
 632                 buffer += readlen;
 633                 imglen -= readlen;
 634
 635                 if (opts->readoob) {
 636                         result = meminfo->read_oob(meminfo,
 637                                                    mtdoffset,
 638                                                    meminfo->oobsize,
 639                                                    &readlen,
 640                                                    (unsigned char *)
 641                                                    &oob_buf);
 642
 643                         if (result != 0) {
 644                                 printf("\nMTD readoob failure: %d\n",
 645                                        result);
 646                                 return -1;
 647                         }
 648
 649
 650                         if (imglen < readlen) {
 651                                 readlen = imglen;
 652                         }
 653
 654                         memcpy(buffer, oob_buf, readlen);
 655
 656                         buffer += readlen;
 657                         imglen -= readlen;
 658                 }
 659
 660                 if (!opts->quiet) {
 661                         unsigned long long n = (unsigned long long)
 662                                  (opts->length-imglen) * 100;
 663                         int percent;
 664
 665                         do_div(n, opts->length);
 666                         percent = (int)n;
 667
 668                         /* output progress message only at whole percent
 669                          * steps to reduce the number of messages printed
 670                          * on (slow) serial consoles
 671                          */
 672                         if (percent != percent_complete) {
 673                         if (!opts->quiet)
 674                                 printf("\rReading data from 0x%x "
 675                                        "-- %3d%% complete.",
 676                                        mtdoffset, percent);
 677                                 percent_complete = percent;
 678                         }
 679                 }
 680
 681                 mtdoffset += meminfo->oobblock;
 682         }
 683
 684         if (!opts->quiet)
 685                 printf("\n");
 686
 687         if (imglen > 0) {
 688                 printf("Could not read entire image due to bad blocks\n");
 689                 return -1;
 690         }
 691
 692         /* return happy */
 693         return 0;
 694 }
 695
 696 /******************************************************************************
 697  * Support for locking / unlocking operations of some NAND devices
 698  *****************************************************************************/
 699
 700 #define NAND_CMD_LOCK           0x2a
 701 #define NAND_CMD_LOCK_TIGHT     0x2c
 702 #define NAND_CMD_UNLOCK1        0x23
 703 #define NAND_CMD_UNLOCK2        0x24
 704 #define NAND_CMD_LOCK_STATUS    0x7a
 705
 706 /**
 707  * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
 708  *            state
 709  *
 710  * @param meminfo       nand mtd instance
 711  * @param tight         bring device in lock tight mode
 712  *
 713  * @return              0 on success, -1 in case of error
 714  *
 715  * The lock / lock-tight command only applies to the whole chip. To get some
 716  * parts of the chip lock and others unlocked use the following sequence:
 717  *
 718  * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
 719  * - Call nand_unlock() once for each consecutive area to be unlocked
 720  * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
 721  *
 722  *   If the device is in lock-tight state software can't change the
 723  *   current active lock/unlock state of all pages. nand_lock() / nand_unlock()
 724  *   calls will fail. It is only posible to leave lock-tight state by
 725  *   an hardware signal (low pulse on _WP pin) or by power down.
 726  */
 727 int nand_lock(nand_info_t *meminfo, int tight)
 728 {
 729         int ret = 0;
 730         int status;
 731         struct nand_chip *this = meminfo->priv;
 732
 733         /* select the NAND device */
 734         this->select_chip(meminfo, 0);
 735
 736         this->cmdfunc(meminfo,
 737                       (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
 738                       -1, -1);
 739
 740         /* call wait ready function */
 741         status = this->waitfunc(meminfo, this, FL_WRITING);
 742
 743         /* see if device thinks it succeeded */
 744         if (status & 0x01) {
 745                 ret = -1;
 746         }
 747
 748         /* de-select the NAND device */
 749         this->select_chip(meminfo, -1);
 750         return ret;
 751 }
 752
 753 /**
 754  * nand_get_lock_status: - query current lock state from one page of NAND
 755  *                         flash
 756  *
 757  * @param meminfo       nand mtd instance
 758  * @param offset        page address to query (muss be page aligned!)
 759  *
 760  * @return              -1 in case of error
 761  *                      >0 lock status:
 762  *                        bitfield with the following combinations:
 763  *                        NAND_LOCK_STATUS_TIGHT: page in tight state
 764  *                        NAND_LOCK_STATUS_LOCK:  page locked
 765  *                        NAND_LOCK_STATUS_UNLOCK: page unlocked
 766  *
 767  */
 768 int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
 769 {
 770         int ret = 0;
 771         int chipnr;
 772         int page;
 773         struct nand_chip *this = meminfo->priv;
 774
 775         /* select the NAND device */
 776         chipnr = (int)(offset >> this->chip_shift);
 777         this->select_chip(meminfo, chipnr);
 778
 779
 780         if ((offset & (meminfo->oobblock - 1)) != 0) {
 781                 printf ("nand_get_lock_status: "
 782                         "Start address must be beginning of "
 783                         "nand page!\n");
 784                 ret = -1;
 785                 goto out;
 786         }
 787
 788         /* check the Lock Status */
 789         page = (int)(offset >> this->page_shift);
 790         this->cmdfunc(meminfo, NAND_CMD_LOCK_STATUS, -1, page & this->pagemask);
 791
 792         ret = this->read_byte(meminfo) & (NAND_LOCK_STATUS_TIGHT
 793                                           | NAND_LOCK_STATUS_LOCK
 794                                           | NAND_LOCK_STATUS_UNLOCK);
 795
 796  out:
 797         /* de-select the NAND device */
 798         this->select_chip(meminfo, -1);
 799         return ret;
 800 }
 801
 802 /**
 803  * nand_unlock: - Unlock area of NAND pages
 804  *                only one consecutive area can be unlocked at one time!
 805  *
 806  * @param meminfo       nand mtd instance
 807  * @param start         start byte address
 808  * @param length        number of bytes to unlock (must be a multiple of
 809  *                      page size nand->oobblock)
 810  *
 811  * @return              0 on success, -1 in case of error
 812  */
 813 int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
 814 {
 815         int ret = 0;
 816         int chipnr;
 817         int status;
 818         int page;
 819         struct nand_chip *this = meminfo->priv;
 820         printf ("nand_unlock: start: %08x, length: %d!\n",
 821                 (int)start, (int)length);
 822
 823         /* select the NAND device */
 824         chipnr = (int)(start >> this->chip_shift);
 825         this->select_chip(meminfo, chipnr);
 826
 827         /* check the WP bit */
 828         this->cmdfunc(meminfo, NAND_CMD_STATUS, -1, -1);
 829         if ((this->read_byte(meminfo) & 0x80) == 0) {
 830                 printf ("nand_unlock: Device is write protected!\n");
 831                 ret = -1;
 832                 goto out;
 833         }
 834
 835         if ((start & (meminfo->oobblock - 1)) != 0) {
 836                 printf ("nand_unlock: Start address must be beginning of "
 837                         "nand page!\n");
 838                 ret = -1;
 839                 goto out;
 840         }
 841
 842         if (length == 0 || (length & (meminfo->oobblock - 1)) != 0) {
 843                 printf ("nand_unlock: Length must be a multiple of nand page "
 844                         "size!\n");
 845                 ret = -1;
 846                 goto out;
 847         }
 848
 849         /* submit address of first page to unlock */
 850         page = (int)(start >> this->page_shift);
 851         this->cmdfunc(meminfo, NAND_CMD_UNLOCK1, -1, page & this->pagemask);
 852
 853         /* submit ADDRESS of LAST page to unlock */
 854         page += (int)(length >> this->page_shift) - 1;
 855         this->cmdfunc(meminfo, NAND_CMD_UNLOCK2, -1, page & this->pagemask);
 856
 857         /* call wait ready function */
 858         status = this->waitfunc(meminfo, this, FL_WRITING);
 859         /* see if device thinks it succeeded */
 860         if (status & 0x01) {
 861                 /* there was an error */
 862                 ret = -1;
 863                 goto out;
 864         }
 865
 866  out:
 867         /* de-select the NAND device */
 868         this->select_chip(meminfo, -1);
 869         return ret;
 870 }
 871
 872 #endif