common/env_nand.c

   1 /*
   2  * (C) Copyright 2008
   3  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
   4  *
   5  * (C) Copyright 2004
   6  * Jian Zhang, Texas Instruments, jzhang@ti.com.
   7
   8  * (C) Copyright 2000-2006
   9  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  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 <asm/errno.h>
  42
  43 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
  44 #define CMD_SAVEENV
  45 #elif defined(CONFIG_ENV_OFFSET_REDUND)
  46 #error Cannot use CONFIG_ENV_OFFSET_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
  47 #endif
  48
  49 #if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  50 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  51 #endif
  52
  53 #ifndef CONFIG_ENV_RANGE
  54 #define CONFIG_ENV_RANGE        CONFIG_ENV_SIZE
  55 #endif
  56
  57 /* references to names in env_common.c */
  58 extern uchar default_environment[];
  59
  60 char * env_name_spec = "NAND";
  61
  62
  63 #if defined(ENV_IS_EMBEDDED)
  64 extern uchar environment[];
  65 env_t *env_ptr = (env_t *)(&environment[0]);
  66 #elif defined(CONFIG_NAND_ENV_DST)
  67 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
  68 #else /* ! ENV_IS_EMBEDDED */
  69 env_t *env_ptr = 0;
  70 #endif /* ENV_IS_EMBEDDED */
  71
  72
  73 /* local functions */
  74 #if !defined(ENV_IS_EMBEDDED)
  75 static void use_default(void);
  76 #endif
  77
  78 DECLARE_GLOBAL_DATA_PTR;
  79
  80 uchar env_get_char_spec (int index)
  81 {
  82         return ( *((uchar *)(gd->env_addr + index)) );
  83 }
  84
  85
  86 /* this is called before nand_init()
  87  * so we can't read Nand to validate env data.
  88  * Mark it OK for now. env_relocate() in env_common.c
  89  * will call our relocate function which does the real
  90  * validation.
  91  *
  92  * When using a NAND boot image (like sequoia_nand), the environment
  93  * can be embedded or attached to the U-Boot image in NAND flash. This way
  94  * the SPL loads not only the U-Boot image from NAND but also the
  95  * environment.
  96  */
  97 int env_init(void)
  98 {
  99 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
 100         int crc1_ok = 0, crc2_ok = 0;
 101         env_t *tmp_env1;
 102
 103 #ifdef CONFIG_ENV_OFFSET_REDUND
 104         env_t *tmp_env2;
 105
 106         tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
 107         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 108 #endif
 109
 110         tmp_env1 = env_ptr;
 111
 112         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 113
 114         if (!crc1_ok && !crc2_ok) {
 115                 gd->env_addr  = 0;
 116                 gd->env_valid = 0;
 117
 118                 return 0;
 119         } else if (crc1_ok && !crc2_ok) {
 120                 gd->env_valid = 1;
 121         }
 122 #ifdef CONFIG_ENV_OFFSET_REDUND
 123         else if (!crc1_ok && crc2_ok) {
 124                 gd->env_valid = 2;
 125         } else {
 126                 /* both ok - check serial */
 127                 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
 128                         gd->env_valid = 2;
 129                 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
 130                         gd->env_valid = 1;
 131                 else if(tmp_env1->flags > tmp_env2->flags)
 132                         gd->env_valid = 1;
 133                 else if(tmp_env2->flags > tmp_env1->flags)
 134                         gd->env_valid = 2;
 135                 else /* flags are equal - almost impossible */
 136                         gd->env_valid = 1;
 137         }
 138
 139         if (gd->env_valid == 2)
 140                 env_ptr = tmp_env2;
 141         else
 142 #endif
 143         if (gd->env_valid == 1)
 144                 env_ptr = tmp_env1;
 145
 146         gd->env_addr = (ulong)env_ptr->data;
 147
 148 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 149         gd->env_addr  = (ulong)&default_environment[0];
 150         gd->env_valid = 1;
 151 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 152
 153         return (0);
 154 }
 155
 156 #ifdef CMD_SAVEENV
 157 /*
 158  * The legacy NAND code saved the environment in the first NAND device i.e.,
 159  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 160  */
 161 int writeenv(size_t offset, u_char *buf)
 162 {
 163         size_t end = offset + CONFIG_ENV_RANGE;
 164         size_t amount_saved = 0;
 165         size_t blocksize, len;
 166
 167         u_char *char_ptr;
 168
 169         blocksize = nand_info[0].erasesize;
 170         len = min(blocksize, CONFIG_ENV_SIZE);
 171
 172         while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
 173                 if (nand_block_isbad(&nand_info[0], offset)) {
 174                         offset += blocksize;
 175                 } else {
 176                         char_ptr = &buf[amount_saved];
 177                         if (nand_write(&nand_info[0], offset, &len,
 178                                         char_ptr))
 179                                 return 1;
 180                         offset += blocksize;
 181                         amount_saved += len;
 182                 }
 183         }
 184         if (amount_saved != CONFIG_ENV_SIZE)
 185                 return 1;
 186
 187         return 0;
 188 }
 189 #ifdef CONFIG_ENV_OFFSET_REDUND
 190 int saveenv(void)
 191 {
 192         int ret = 0;
 193         nand_erase_options_t nand_erase_options;
 194
 195         env_ptr->flags++;
 196
 197         nand_erase_options.length = CONFIG_ENV_RANGE;
 198         nand_erase_options.quiet = 0;
 199         nand_erase_options.jffs2 = 0;
 200         nand_erase_options.scrub = 0;
 201
 202         if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 203                 return 1;
 204         if(gd->env_valid == 1) {
 205                 puts ("Erasing redundant Nand...\n");
 206                 nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
 207                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 208                         return 1;
 209
 210                 puts ("Writing to redundant Nand... ");
 211                 ret = writeenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
 212         } else {
 213                 puts ("Erasing Nand...\n");
 214                 nand_erase_options.offset = CONFIG_ENV_OFFSET;
 215                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 216                         return 1;
 217
 218                 puts ("Writing to Nand... ");
 219                 ret = writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
 220         }
 221         if (ret) {
 222                 puts("FAILED!\n");
 223                 return 1;
 224         }
 225
 226         puts ("done\n");
 227         gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
 228         return ret;
 229 }
 230 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 231 int saveenv(void)
 232 {
 233         int ret = 0;
 234         nand_erase_options_t nand_erase_options;
 235
 236         nand_erase_options.length = CONFIG_ENV_RANGE;
 237         nand_erase_options.quiet = 0;
 238         nand_erase_options.jffs2 = 0;
 239         nand_erase_options.scrub = 0;
 240         nand_erase_options.offset = CONFIG_ENV_OFFSET;
 241
 242         if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 243                 return 1;
 244         puts ("Erasing Nand...\n");
 245         if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 246                 return 1;
 247
 248         puts ("Writing to Nand... ");
 249         if (writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr)) {
 250                 puts("FAILED!\n");
 251                 return 1;
 252         }
 253
 254         puts ("done\n");
 255         return ret;
 256 }
 257 #endif /* CONFIG_ENV_OFFSET_REDUND */
 258 #endif /* CMD_SAVEENV */
 259
 260 int readenv (size_t offset, u_char * buf)
 261 {
 262         size_t end = offset + CONFIG_ENV_RANGE;
 263         size_t amount_loaded = 0;
 264         size_t blocksize, len;
 265
 266         u_char *char_ptr;
 267
 268         blocksize = nand_info[0].erasesize;
 269         len = min(blocksize, CONFIG_ENV_SIZE);
 270
 271         while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
 272                 if (nand_block_isbad(&nand_info[0], offset)) {
 273                         offset += blocksize;
 274                 } else {
 275                         char_ptr = &buf[amount_loaded];
 276                         if (nand_read(&nand_info[0], offset, &len, char_ptr))
 277                                 return 1;
 278                         offset += blocksize;
 279                         amount_loaded += len;
 280                 }
 281         }
 282         if (amount_loaded != CONFIG_ENV_SIZE)
 283                 return 1;
 284
 285         return 0;
 286 }
 287
 288 #ifdef CONFIG_ENV_OFFSET_OOB
 289 int get_nand_env_oob(nand_info_t *nand, unsigned long *result)
 290 {
 291         struct mtd_oob_ops ops;
 292         uint32_t oob_buf[ENV_OFFSET_SIZE/sizeof(uint32_t)];
 293         int ret;
 294
 295         ops.datbuf = NULL;
 296         ops.mode = MTD_OOB_AUTO;
 297         ops.ooboffs = 0;
 298         ops.ooblen = ENV_OFFSET_SIZE;
 299         ops.oobbuf = (void *) oob_buf;
 300
 301         ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
 302         if (ret) {
 303                 printf("error reading OOB block 0\n");
 304                 return ret;
 305         }
 306
 307         if (oob_buf[0] == ENV_OOB_MARKER) {
 308                 *result = oob_buf[1] * nand->erasesize;
 309         } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
 310                 *result = oob_buf[1];
 311         } else {
 312                 printf("No dynamic environment marker in OOB block 0\n");
 313                 return -ENOENT;
 314         }
 315
 316         return 0;
 317 }
 318 #endif
 319
 320 #ifdef CONFIG_ENV_OFFSET_REDUND
 321 void env_relocate_spec (void)
 322 {
 323 #if !defined(ENV_IS_EMBEDDED)
 324         int crc1_ok = 0, crc2_ok = 0;
 325         env_t *tmp_env1, *tmp_env2;
 326
 327         tmp_env1 = (env_t *) malloc(CONFIG_ENV_SIZE);
 328         tmp_env2 = (env_t *) malloc(CONFIG_ENV_SIZE);
 329
 330         if ((tmp_env1 == NULL) || (tmp_env2 == NULL)) {
 331                 puts("Can't allocate buffers for environment\n");
 332                 free (tmp_env1);
 333                 free (tmp_env2);
 334                 return use_default();
 335         }
 336
 337         if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
 338                 puts("No Valid Environment Area Found\n");
 339         if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
 340                 puts("No Valid Reundant Environment Area Found\n");
 341
 342         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 343         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 344
 345         if(!crc1_ok && !crc2_ok) {
 346                 free(tmp_env1);
 347                 free(tmp_env2);
 348                 return use_default();
 349         } else if(crc1_ok && !crc2_ok)
 350                 gd->env_valid = 1;
 351         else if(!crc1_ok && crc2_ok)
 352                 gd->env_valid = 2;
 353         else {
 354                 /* both ok - check serial */
 355                 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
 356                         gd->env_valid = 2;
 357                 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
 358                         gd->env_valid = 1;
 359                 else if(tmp_env1->flags > tmp_env2->flags)
 360                         gd->env_valid = 1;
 361                 else if(tmp_env2->flags > tmp_env1->flags)
 362                         gd->env_valid = 2;
 363                 else /* flags are equal - almost impossible */
 364                         gd->env_valid = 1;
 365
 366         }
 367
 368         free(env_ptr);
 369         if(gd->env_valid == 1) {
 370                 env_ptr = tmp_env1;
 371                 free(tmp_env2);
 372         } else {
 373                 env_ptr = tmp_env2;
 374                 free(tmp_env1);
 375         }
 376
 377 #endif /* ! ENV_IS_EMBEDDED */
 378 }
 379 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 380 /*
 381  * The legacy NAND code saved the environment in the first NAND device i.e.,
 382  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 383  */
 384 void env_relocate_spec (void)
 385 {
 386 #if !defined(ENV_IS_EMBEDDED)
 387         int ret;
 388
 389 #if defined(CONFIG_ENV_OFFSET_OOB)
 390         ret = get_nand_env_oob(&nand_info[0], &nand_env_oob_offset);
 391         /* If unable to read environment offset from NAND OOB then fall through
 392          * to the normal environment reading code below
 393          */
 394         if (!ret)
 395                 printf("Found Environment offset in OOB..\n");
 396         else
 397                 return use_default();
 398 #endif
 399
 400         ret = readenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
 401         if (ret)
 402                 return use_default();
 403
 404         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 405                 return use_default();
 406 #endif /* ! ENV_IS_EMBEDDED */
 407 }
 408 #endif /* CONFIG_ENV_OFFSET_REDUND */
 409
 410 #if !defined(ENV_IS_EMBEDDED)
 411 static void use_default()
 412 {
 413         puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
 414         set_default_env();
 415 }
 416 #endif