common/env_nand.c

   1 /*
   2  * (C) Copyright 2000-2010
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2008
   6  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
   7  *
   8  * (C) Copyright 2004
   9  * Jian Zhang, Texas Instruments, jzhang@ti.com.
  10  *
  11  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Andreas Heppel <aheppel@sysgo.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 as
  19  * published by the Free Software Foundation; either version 2 of
  20  * the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  * MA 02111-1307 USA
  31  */
  32
  33 #define DEBUG
  34
  35 #include <common.h>
  36 #include <command.h>
  37 #include <environment.h>
  38 #include <linux/stddef.h>
  39 #include <malloc.h>
  40 #include <nand.h>
  41 #include <search.h>
  42 #include <errno.h>
  43
  44 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
  45 #define CMD_SAVEENV
  46 #elif defined(CONFIG_ENV_OFFSET_REDUND)
  47 #error Cannot use CONFIG_ENV_OFFSET_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
  48 #endif
  49
  50 #if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  51 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  52 #endif
  53
  54 #ifndef CONFIG_ENV_RANGE
  55 #define CONFIG_ENV_RANGE        CONFIG_ENV_SIZE
  56 #endif
  57
  58 char *env_name_spec = "NAND";
  59
  60
  61 #if defined(ENV_IS_EMBEDDED)
  62 env_t *env_ptr = &environment;
  63 #elif defined(CONFIG_NAND_ENV_DST)
  64 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
  65 #else /* ! ENV_IS_EMBEDDED */
  66 env_t *env_ptr = 0;
  67 #endif /* ENV_IS_EMBEDDED */
  68
  69 DECLARE_GLOBAL_DATA_PTR;
  70
  71 uchar env_get_char_spec (int index)
  72 {
  73         return ( *((uchar *)(gd->env_addr + index)) );
  74 }
  75
  76 /*
  77  * This is called before nand_init() so we can't read NAND to
  78  * validate env data.
  79  *
  80  * Mark it OK for now. env_relocate() in env_common.c will call our
  81  * relocate function which does the real validation.
  82  *
  83  * When using a NAND boot image (like sequoia_nand), the environment
  84  * can be embedded or attached to the U-Boot image in NAND flash.
  85  * This way the SPL loads not only the U-Boot image from NAND but
  86  * also the environment.
  87  */
  88 int env_init(void)
  89 {
  90 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
  91         int crc1_ok = 0, crc2_ok = 0;
  92         env_t *tmp_env1;
  93
  94 #ifdef CONFIG_ENV_OFFSET_REDUND
  95         env_t *tmp_env2;
  96
  97         tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
  98         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
  99 #endif
 100
 101         tmp_env1 = env_ptr;
 102
 103         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 104
 105         if (!crc1_ok && !crc2_ok) {
 106                 gd->env_addr  = 0;
 107                 gd->env_valid = 0;
 108
 109                 return 0;
 110         } else if (crc1_ok && !crc2_ok) {
 111                 gd->env_valid = 1;
 112         }
 113 #ifdef CONFIG_ENV_OFFSET_REDUND
 114         else if (!crc1_ok && crc2_ok) {
 115                 gd->env_valid = 2;
 116         } else {
 117                 /* both ok - check serial */
 118                 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
 119                         gd->env_valid = 2;
 120                 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
 121                         gd->env_valid = 1;
 122                 else if(tmp_env1->flags > tmp_env2->flags)
 123                         gd->env_valid = 1;
 124                 else if(tmp_env2->flags > tmp_env1->flags)
 125                         gd->env_valid = 2;
 126                 else /* flags are equal - almost impossible */
 127                         gd->env_valid = 1;
 128         }
 129
 130         if (gd->env_valid == 2)
 131                 env_ptr = tmp_env2;
 132         else
 133 #endif
 134         if (gd->env_valid == 1)
 135                 env_ptr = tmp_env1;
 136
 137         gd->env_addr = (ulong)env_ptr->data;
 138
 139 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 140         gd->env_addr  = (ulong)&default_environment[0];
 141         gd->env_valid = 1;
 142 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 143
 144         return (0);
 145 }
 146
 147 #ifdef CMD_SAVEENV
 148 /*
 149  * The legacy NAND code saved the environment in the first NAND device i.e.,
 150  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 151  */
 152 int writeenv(size_t offset, u_char *buf)
 153 {
 154         size_t end = offset + CONFIG_ENV_RANGE;
 155         size_t amount_saved = 0;
 156         size_t blocksize, len;
 157
 158         u_char *char_ptr;
 159
 160         blocksize = nand_info[0].erasesize;
 161         len = min(blocksize, CONFIG_ENV_SIZE);
 162
 163         while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
 164                 if (nand_block_isbad(&nand_info[0], offset)) {
 165                         offset += blocksize;
 166                 } else {
 167                         char_ptr = &buf[amount_saved];
 168                         if (nand_write(&nand_info[0], offset, &len,
 169                                         char_ptr))
 170                                 return 1;
 171                         offset += blocksize;
 172                         amount_saved += len;
 173                 }
 174         }
 175         if (amount_saved != CONFIG_ENV_SIZE)
 176                 return 1;
 177
 178         return 0;
 179 }
 180
 181 #ifdef CONFIG_ENV_OFFSET_REDUND
 182 static unsigned char env_flags;
 183
 184 int saveenv(void)
 185 {
 186         env_t   env_new;
 187         ssize_t len;
 188         char    *res;
 189         int     ret = 0;
 190         nand_erase_options_t nand_erase_options;
 191
 192         memset(&nand_erase_options, 0, sizeof(nand_erase_options));
 193         nand_erase_options.length = CONFIG_ENV_RANGE;
 194
 195         if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 196                 return 1;
 197
 198         res = (char *)&env_new.data;
 199         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 200         if (len < 0) {
 201                 error("Cannot export environment: errno = %d\n", errno);
 202                 return 1;
 203         }
 204         env_new.crc   = crc32(0, env_new.data, ENV_SIZE);
 205         env_new.flags = ++env_flags; /* increase the serial */
 206
 207         if(gd->env_valid == 1) {
 208                 puts("Erasing redundant NAND...\n");
 209                 nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
 210                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 211                         return 1;
 212
 213                 puts("Writing to redundant NAND... ");
 214                 ret = writeenv(CONFIG_ENV_OFFSET_REDUND,
 215                         (u_char *)&env_new);
 216         } else {
 217                 puts("Erasing NAND...\n");
 218                 nand_erase_options.offset = CONFIG_ENV_OFFSET;
 219                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 220                         return 1;
 221
 222                 puts("Writing to NAND... ");
 223                 ret = writeenv(CONFIG_ENV_OFFSET,
 224                         (u_char *)&env_new);
 225         }
 226         if (ret) {
 227                 puts("FAILED!\n");
 228                 return 1;
 229         }
 230
 231         puts("done\n");
 232
 233         gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
 234
 235         return ret;
 236 }
 237 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 238 int saveenv(void)
 239 {
 240         int ret = 0;
 241         env_t   env_new;
 242         ssize_t len;
 243         char    *res;
 244         nand_erase_options_t nand_erase_options;
 245
 246         memset(&nand_erase_options, 0, sizeof(nand_erase_options));
 247         nand_erase_options.length = CONFIG_ENV_RANGE;
 248         nand_erase_options.offset = CONFIG_ENV_OFFSET;
 249
 250         if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 251                 return 1;
 252
 253         res = (char *)&env_new.data;
 254         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 255         if (len < 0) {
 256                 error("Cannot export environment: errno = %d\n", errno);
 257                 return 1;
 258         }
 259         env_new.crc   = crc32(0, env_new.data, ENV_SIZE);
 260
 261         puts("Erasing Nand...\n");
 262         if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 263                 return 1;
 264
 265         puts("Writing to Nand... ");
 266         if (writeenv(CONFIG_ENV_OFFSET, (u_char *)&env_new)) {
 267                 puts("FAILED!\n");
 268                 return 1;
 269         }
 270
 271         puts("done\n");
 272         return ret;
 273 }
 274 #endif /* CONFIG_ENV_OFFSET_REDUND */
 275 #endif /* CMD_SAVEENV */
 276
 277 int readenv(size_t offset, u_char * buf)
 278 {
 279         size_t end = offset + CONFIG_ENV_RANGE;
 280         size_t amount_loaded = 0;
 281         size_t blocksize, len;
 282
 283         u_char *char_ptr;
 284
 285         blocksize = nand_info[0].erasesize;
 286         if (!blocksize)
 287                 return 1;
 288         len = min(blocksize, CONFIG_ENV_SIZE);
 289
 290         while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
 291                 if (nand_block_isbad(&nand_info[0], offset)) {
 292                         offset += blocksize;
 293                 } else {
 294                         char_ptr = &buf[amount_loaded];
 295                         if (nand_read_skip_bad(&nand_info[0], offset, &len, char_ptr))
 296                                 return 1;
 297                         offset += blocksize;
 298                         amount_loaded += len;
 299                 }
 300         }
 301         if (amount_loaded != CONFIG_ENV_SIZE)
 302                 return 1;
 303
 304         return 0;
 305 }
 306
 307 #ifdef CONFIG_ENV_OFFSET_OOB
 308 int get_nand_env_oob(nand_info_t *nand, unsigned long *result)
 309 {
 310         struct mtd_oob_ops ops;
 311         uint32_t oob_buf[ENV_OFFSET_SIZE/sizeof(uint32_t)];
 312         int ret;
 313
 314         ops.datbuf = NULL;
 315         ops.mode = MTD_OOB_AUTO;
 316         ops.ooboffs = 0;
 317         ops.ooblen = ENV_OFFSET_SIZE;
 318         ops.oobbuf = (void *) oob_buf;
 319
 320         ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
 321         if (ret) {
 322                 printf("error reading OOB block 0\n");
 323                 return ret;
 324         }
 325
 326         if (oob_buf[0] == ENV_OOB_MARKER) {
 327                 *result = oob_buf[1] * nand->erasesize;
 328         } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
 329                 *result = oob_buf[1];
 330         } else {
 331                 printf("No dynamic environment marker in OOB block 0\n");
 332                 return -ENOENT;
 333         }
 334
 335         return 0;
 336 }
 337 #endif
 338
 339 #ifdef CONFIG_ENV_OFFSET_REDUND
 340 void env_relocate_spec(void)
 341 {
 342 #if !defined(ENV_IS_EMBEDDED)
 343         int crc1_ok = 0, crc2_ok = 0;
 344         env_t *ep, *tmp_env1, *tmp_env2;
 345
 346         tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
 347         tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
 348
 349         if ((tmp_env1 == NULL) || (tmp_env2 == NULL)) {
 350                 puts("Can't allocate buffers for environment\n");
 351                 free(tmp_env1);
 352                 free(tmp_env2);
 353                 set_default_env("!malloc() failed");
 354                 return;
 355         }
 356
 357         if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
 358                 puts("No Valid Environment Area found\n");
 359
 360         if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
 361                 puts("No Valid Redundant Environment Area found\n");
 362
 363         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 364         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 365
 366         if (!crc1_ok && !crc2_ok) {
 367                 free(tmp_env1);
 368                 free(tmp_env2);
 369                 set_default_env("!bad CRC");
 370                 return;
 371         } else if (crc1_ok && !crc2_ok) {
 372                 gd->env_valid = 1;
 373         } else if (!crc1_ok && crc2_ok) {
 374                 gd->env_valid = 2;
 375         } else {
 376                 /* both ok - check serial */
 377                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 378                         gd->env_valid = 2;
 379                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 380                         gd->env_valid = 1;
 381                 else if (tmp_env1->flags > tmp_env2->flags)
 382                         gd->env_valid = 1;
 383                 else if (tmp_env2->flags > tmp_env1->flags)
 384                         gd->env_valid = 2;
 385                 else /* flags are equal - almost impossible */
 386                         gd->env_valid = 1;
 387
 388         }
 389
 390         free(env_ptr);
 391
 392         if (gd->env_valid == 1)
 393                 ep = tmp_env1;
 394         else
 395                 ep = tmp_env2;
 396
 397         env_flags = ep->flags;
 398         env_import((char *)ep, 0);
 399
 400         free(tmp_env1);
 401         free(tmp_env2);
 402
 403 #endif /* ! ENV_IS_EMBEDDED */
 404 }
 405 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 406 /*
 407  * The legacy NAND code saved the environment in the first NAND
 408  * device i.e., nand_dev_desc + 0. This is also the behaviour using
 409  * the new NAND code.
 410  */
 411 void env_relocate_spec (void)
 412 {
 413 #if !defined(ENV_IS_EMBEDDED)
 414         int ret;
 415         char buf[CONFIG_ENV_SIZE];
 416
 417 #if defined(CONFIG_ENV_OFFSET_OOB)
 418         ret = get_nand_env_oob(&nand_info[0], &nand_env_oob_offset);
 419         /*
 420          * If unable to read environment offset from NAND OOB then fall through
 421          * to the normal environment reading code below
 422          */
 423         if (!ret) {
 424                 printf("Found Environment offset in OOB..\n");
 425         } else {
 426                 set_default_env("!no env offset in OOB");
 427                 return;
 428         }
 429 #endif
 430
 431         ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
 432         if (ret) {
 433                 set_default_env("!readenv() failed");
 434                 return;
 435         }
 436
 437         env_import(buf, 1);
 438 #endif /* ! ENV_IS_EMBEDDED */
 439 }
 440 #endif /* CONFIG_ENV_OFFSET_REDUND */