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