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
  37 #if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
  38
  39 #include <command.h>
  40 #include <environment.h>
  41 #include <linux/stddef.h>
  42 #include <malloc.h>
  43 #include <nand.h>
  44
  45 #if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)
  46 #define CMD_SAVEENV
  47 #elif defined(CFG_ENV_OFFSET_REDUND)
  48 #error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
  49 #endif
  50
  51 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
  52 #error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
  53 #endif
  54
  55 #ifdef CONFIG_INFERNO
  56 #error CONFIG_INFERNO not supported yet
  57 #endif
  58
  59 #ifndef CFG_ENV_RANGE
  60 #define CFG_ENV_RANGE   CFG_ENV_SIZE
  61 #endif
  62
  63 int nand_legacy_rw (struct nand_chip* nand, int cmd,
  64             size_t start, size_t len,
  65             size_t * retlen, u_char * buf);
  66
  67 /* references to names in env_common.c */
  68 extern uchar default_environment[];
  69 extern int default_environment_size;
  70
  71 char * env_name_spec = "NAND";
  72
  73
  74 #ifdef ENV_IS_EMBEDDED
  75 extern uchar environment[];
  76 env_t *env_ptr = (env_t *)(&environment[0]);
  77 #else /* ! ENV_IS_EMBEDDED */
  78 env_t *env_ptr = 0;
  79 #endif /* ENV_IS_EMBEDDED */
  80
  81
  82 /* local functions */
  83 #if !defined(ENV_IS_EMBEDDED)
  84 static void use_default(void);
  85 #endif
  86
  87 DECLARE_GLOBAL_DATA_PTR;
  88
  89 uchar env_get_char_spec (int index)
  90 {
  91         return ( *((uchar *)(gd->env_addr + index)) );
  92 }
  93
  94
  95 /* this is called before nand_init()
  96  * so we can't read Nand to validate env data.
  97  * Mark it OK for now. env_relocate() in env_common.c
  98  * will call our relocate function which will does
  99  * the real validation.
 100  *
 101  * When using a NAND boot image (like sequoia_nand), the environment
 102  * can be embedded or attached to the U-Boot image in NAND flash. This way
 103  * the SPL loads not only the U-Boot image from NAND but also the
 104  * environment.
 105  */
 106 int env_init(void)
 107 {
 108 #if defined(ENV_IS_EMBEDDED)
 109         size_t total;
 110         int crc1_ok = 0, crc2_ok = 0;
 111         env_t *tmp_env1, *tmp_env2;
 112
 113         total = CFG_ENV_SIZE;
 114
 115         tmp_env1 = env_ptr;
 116         tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
 117
 118         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 119         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 120
 121         if (!crc1_ok && !crc2_ok)
 122                 gd->env_valid = 0;
 123         else if(crc1_ok && !crc2_ok)
 124                 gd->env_valid = 1;
 125         else if(!crc1_ok && crc2_ok)
 126                 gd->env_valid = 2;
 127         else {
 128                 /* both ok - check serial */
 129                 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
 130                         gd->env_valid = 2;
 131                 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
 132                         gd->env_valid = 1;
 133                 else if(tmp_env1->flags > tmp_env2->flags)
 134                         gd->env_valid = 1;
 135                 else if(tmp_env2->flags > tmp_env1->flags)
 136                         gd->env_valid = 2;
 137                 else /* flags are equal - almost impossible */
 138                         gd->env_valid = 1;
 139         }
 140
 141         if (gd->env_valid == 1)
 142                 env_ptr = tmp_env1;
 143         else if (gd->env_valid == 2)
 144                 env_ptr = tmp_env2;
 145 #else /* ENV_IS_EMBEDDED */
 146         gd->env_addr  = (ulong)&default_environment[0];
 147         gd->env_valid = 1;
 148 #endif /* ENV_IS_EMBEDDED */
 149
 150         return (0);
 151 }
 152
 153 #ifdef CMD_SAVEENV
 154 /*
 155  * The legacy NAND code saved the environment in the first NAND device i.e.,
 156  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 157  */
 158 int writeenv(size_t offset, u_char *buf)
 159 {
 160         size_t end = offset + CFG_ENV_RANGE;
 161         size_t amount_saved = 0;
 162         size_t blocksize;
 163
 164         u_char *char_ptr;
 165
 166         blocksize = nand_info[0].erasesize;
 167
 168         while (amount_saved < CFG_ENV_SIZE && offset < end) {
 169                 if (nand_block_isbad(&nand_info[0], offset)) {
 170                         offset += blocksize;
 171                 } else {
 172                         char_ptr = &buf[amount_saved];
 173                         if (nand_write(&nand_info[0], offset, &blocksize,
 174                                         char_ptr))
 175                                 return 1;
 176                         offset += blocksize;
 177                         amount_saved += blocksize;
 178                 }
 179         }
 180         if (amount_saved != CFG_ENV_SIZE)
 181                 return 1;
 182
 183         return 0;
 184 }
 185 #ifdef CFG_ENV_OFFSET_REDUND
 186 int saveenv(void)
 187 {
 188         size_t total;
 189         int ret = 0;
 190         nand_erase_options_t nand_erase_options;
 191
 192         env_ptr->flags++;
 193         total = CFG_ENV_SIZE;
 194
 195         nand_erase_options.length = CFG_ENV_RANGE;
 196         nand_erase_options.quiet = 0;
 197         nand_erase_options.jffs2 = 0;
 198         nand_erase_options.scrub = 0;
 199
 200         if (CFG_ENV_RANGE < CFG_ENV_SIZE)
 201                 return 1;
 202         if(gd->env_valid == 1) {
 203                 puts ("Erasing redundant Nand...\n");
 204                 nand_erase_options.offset = CFG_ENV_OFFSET_REDUND;
 205                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 206                         return 1;
 207
 208                 puts ("Writing to redundant Nand... ");
 209                 ret = writeenv(CFG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
 210         } else {
 211                 puts ("Erasing Nand...\n");
 212                 nand_erase_options.offset = CFG_ENV_OFFSET;
 213                 if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 214                         return 1;
 215
 216                 puts ("Writing to Nand... ");
 217                 ret = writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
 218         }
 219         if (ret) {
 220                 puts("FAILED!\n");
 221                 return 1;
 222         }
 223
 224         puts ("done\n");
 225         gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
 226         return ret;
 227 }
 228 #else /* ! CFG_ENV_OFFSET_REDUND */
 229 int saveenv(void)
 230 {
 231         size_t total;
 232         int ret = 0;
 233
 234         nand_erase_options.length = CFG_ENV_RANGE;
 235         nand_erase_options.quiet = 0;
 236         nand_erase_options.jffs2 = 0;
 237         nand_erase_options.scrub = 0;
 238         nand_erase_options.offset = CFG_ENV_OFFSET;
 239
 240         if (CFG_ENV_RANGE < CFG_ENV_SIZE)
 241                 return 1;
 242         puts ("Erasing Nand...\n");
 243         if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 244                 return 1;
 245
 246         puts ("Writing to Nand... ");
 247         total = CFG_ENV_SIZE;
 248         if (writeenv(CFG_ENV_OFFSET, env_ptr)) {
 249                 puts("FAILED!\n");
 250                 return 1;
 251         }
 252
 253         puts ("done\n");
 254         return ret;
 255 }
 256 #endif /* CFG_ENV_OFFSET_REDUND */
 257 #endif /* CMD_SAVEENV */
 258
 259 int readenv (size_t offset, u_char * buf)
 260 {
 261         size_t end = offset + CFG_ENV_RANGE;
 262         size_t amount_loaded = 0;
 263         size_t blocksize;
 264
 265         u_char *char_ptr;
 266
 267         blocksize = nand_info[0].erasesize;
 268
 269         while (amount_loaded < CFG_ENV_SIZE && offset < end) {
 270                 if (nand_block_isbad(&nand_info[0], offset)) {
 271                         offset += blocksize;
 272                 } else {
 273                         char_ptr = &buf[amount_loaded];
 274                         if (nand_read(&nand_info[0], offset, &blocksize, char_ptr))
 275                                 return 1;
 276                         offset += blocksize;
 277                         amount_loaded += blocksize;
 278                 }
 279         }
 280         if (amount_loaded != CFG_ENV_SIZE)
 281                 return 1;
 282
 283         return 0;
 284 }
 285
 286 #ifdef CFG_ENV_OFFSET_REDUND
 287 void env_relocate_spec (void)
 288 {
 289 #if !defined(ENV_IS_EMBEDDED)
 290         size_t total;
 291         int crc1_ok = 0, crc2_ok = 0;
 292         env_t *tmp_env1, *tmp_env2;
 293
 294         total = CFG_ENV_SIZE;
 295
 296         tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
 297         tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
 298
 299         if (readenv(CFG_ENV_OFFSET, (u_char *) tmp_env1))
 300                 puts("No Valid Environment Area Found\n");
 301         if (readenv(CFG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
 302                 puts("No Valid Reundant Environment Area Found\n");
 303
 304         crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 305         crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 306
 307         if(!crc1_ok && !crc2_ok)
 308                 return use_default();
 309         else if(crc1_ok && !crc2_ok)
 310                 gd->env_valid = 1;
 311         else if(!crc1_ok && crc2_ok)
 312                 gd->env_valid = 2;
 313         else {
 314                 /* both ok - check serial */
 315                 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
 316                         gd->env_valid = 2;
 317                 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
 318                         gd->env_valid = 1;
 319                 else if(tmp_env1->flags > tmp_env2->flags)
 320                         gd->env_valid = 1;
 321                 else if(tmp_env2->flags > tmp_env1->flags)
 322                         gd->env_valid = 2;
 323                 else /* flags are equal - almost impossible */
 324                         gd->env_valid = 1;
 325
 326         }
 327
 328         free(env_ptr);
 329         if(gd->env_valid == 1) {
 330                 env_ptr = tmp_env1;
 331                 free(tmp_env2);
 332         } else {
 333                 env_ptr = tmp_env2;
 334                 free(tmp_env1);
 335         }
 336
 337 #endif /* ! ENV_IS_EMBEDDED */
 338 }
 339 #else /* ! CFG_ENV_OFFSET_REDUND */
 340 /*
 341  * The legacy NAND code saved the environment in the first NAND device i.e.,
 342  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 343  */
 344 void env_relocate_spec (void)
 345 {
 346 #if !defined(ENV_IS_EMBEDDED)
 347         size_t total;
 348         int ret;
 349
 350         total = CFG_ENV_SIZE;
 351         ret = readenv(CFG_ENV_OFFSET, env_ptr);
 352         if (ret || total != CFG_ENV_SIZE)
 353                 return use_default();
 354
 355         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 356                 return use_default();
 357 #endif /* ! ENV_IS_EMBEDDED */
 358 }
 359 #endif /* CFG_ENV_OFFSET_REDUND */
 360
 361 #if !defined(ENV_IS_EMBEDDED)
 362 static void use_default()
 363 {
 364         puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
 365
 366         if (default_environment_size > CFG_ENV_SIZE){
 367                 puts ("*** Error - default environment is too large\n\n");
 368                 return;
 369         }
 370
 371         memset (env_ptr, 0, sizeof(env_t));
 372         memcpy (env_ptr->data,
 373                         default_environment,
 374                         default_environment_size);
 375         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 376         gd->env_valid = 1;
 377
 378 }
 379 #endif
 380
 381 #endif /* CFG_ENV_IS_IN_NAND */