common/env_flash.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /* #define DEBUG */
  28
  29 #include <common.h>
  30
  31 #if defined(CFG_ENV_IS_IN_FLASH) /* Environment is in Flash */
  32
  33 #include <command.h>
  34 #include <environment.h>
  35 #include <cmd_nvedit.h>
  36 #include <linux/stddef.h>
  37
  38 #if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_FLASH)) == (CFG_CMD_ENV|CFG_CMD_FLASH))
  39 #define CMD_SAVEENV
  40 #elif defined(CFG_ENV_ADDR_REDUND)
  41 #error Cannot use CFG_ENV_ADDR_REDUND without CFG_CMD_ENV & CFG_CMD_FLASH
  42 #endif
  43
  44 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE) && \
  45     defined(CFG_ENV_ADDR_REDUND)
  46 #error CFG_ENV_ADDR_REDUND should not be used when CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
  47 #endif
  48
  49 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND < CFG_ENV_SIZE)
  50 #error CFG_ENV_SIZE_REDUND should not be less then CFG_ENV_SIZE
  51 #endif
  52
  53 #ifdef CONFIG_INFERNO
  54 # ifdef CFG_ENV_ADDR_REDUND
  55 #error CFG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
  56 # endif
  57 #endif
  58
  59 char * env_name_spec = "Flash";
  60
  61 #ifdef ENV_IS_EMBEDDED
  62
  63 extern uchar environment[];
  64 env_t *env_ptr = (env_t *)(&environment[0]);
  65
  66 #ifdef CMD_SAVEENV
  67 /* static env_t *flash_addr = (env_t *)(&environment[0]);-broken on ARM-wd-*/
  68 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  69 #endif
  70
  71 #else /* ! ENV_IS_EMBEDDED */
  72
  73 env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
  74 #ifdef CMD_SAVEENV
  75 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  76 #endif
  77
  78 #endif /* ENV_IS_EMBEDDED */
  79
  80 #ifdef CFG_ENV_ADDR_REDUND
  81 static env_t *flash_addr_new = (env_t *)CFG_ENV_ADDR_REDUND;
  82
  83 static ulong end_addr = CFG_ENV_ADDR + CFG_ENV_SIZE - 1;
  84 static ulong end_addr_new = CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1;
  85
  86 static uchar active_flag = 1;
  87 static uchar obsolete_flag = 0;
  88 #endif
  89
  90 extern uchar default_environment[];
  91 extern int default_environment_size;
  92
  93
  94 uchar env_get_char_spec (int index)
  95 {
  96         DECLARE_GLOBAL_DATA_PTR;
  97
  98         return ( *((uchar *)(gd->env_addr + index)) );
  99 }
 100
 101 #ifdef CFG_ENV_ADDR_REDUND
 102
 103 int  env_init(void)
 104 {
 105         DECLARE_GLOBAL_DATA_PTR;
 106
 107         int crc1_ok =
 108                 (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
 109         int crc2_ok =
 110                 (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
 111
 112         uchar flag1 = flash_addr->flags;
 113         uchar flag2 = flash_addr_new->flags;
 114
 115         ulong addr_default = (ulong)&default_environment[0];
 116         ulong addr1 = (ulong)&(flash_addr->data);
 117         ulong addr2 = (ulong)&(flash_addr_new->data);
 118
 119         if (crc1_ok && ! crc2_ok)
 120         {
 121                 gd->env_addr  = addr1;
 122                 gd->env_valid = 1;
 123         }
 124         else if (! crc1_ok && crc2_ok)
 125         {
 126                 gd->env_addr  = addr2;
 127                 gd->env_valid = 1;
 128         }
 129         else if (! crc1_ok && ! crc2_ok)
 130         {
 131                 gd->env_addr  = addr_default;
 132                 gd->env_valid = 0;
 133         }
 134         else if (flag1 == active_flag && flag2 == obsolete_flag)
 135         {
 136                 gd->env_addr  = addr1;
 137                 gd->env_valid = 1;
 138         }
 139         else if (flag1 == obsolete_flag && flag2 == active_flag)
 140         {
 141                 gd->env_addr  = addr2;
 142                 gd->env_valid = 1;
 143         }
 144         else if (flag1 == flag2)
 145         {
 146                 gd->env_addr  = addr1;
 147                 gd->env_valid = 2;
 148         }
 149         else if (flag1 == 0xFF)
 150         {
 151                 gd->env_addr  = addr1;
 152                 gd->env_valid = 2;
 153         }
 154         else if (flag2 == 0xFF)
 155         {
 156                 gd->env_addr  = addr2;
 157                 gd->env_valid = 2;
 158         }
 159
 160         return (0);
 161 }
 162
 163 #ifdef CMD_SAVEENV
 164 int saveenv(void)
 165 {
 166         int rc = 1;
 167
 168         debug ("Protect off %08lX ... %08lX\n",
 169                 (ulong)flash_addr, end_addr);
 170
 171         if (flash_sect_protect (0, (ulong)flash_addr, end_addr)) {
 172                 goto Done;
 173         }
 174
 175         debug ("Protect off %08lX ... %08lX\n",
 176                 (ulong)flash_addr_new, end_addr_new);
 177
 178         if (flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new)) {
 179                 goto Done;
 180         }
 181
 182         puts ("Erasing Flash...");
 183         debug (" %08lX ... %08lX ...",
 184                 (ulong)flash_addr_new, end_addr_new);
 185
 186         if (flash_sect_erase ((ulong)flash_addr_new, end_addr_new)) {
 187                 goto Done;
 188         }
 189
 190         puts ("Writing to Flash... ");
 191         debug (" %08lX ... %08lX ...",
 192                 (ulong)&(flash_addr_new->data),
 193                 sizeof(env_ptr->data)+(ulong)&(flash_addr_new->data));
 194         if (flash_write(env_ptr->data,
 195                         (ulong)&(flash_addr_new->data),
 196                         sizeof(env_ptr->data)) ||
 197
 198             flash_write((char *)&(env_ptr->crc),
 199                         (ulong)&(flash_addr_new->crc),
 200                         sizeof(env_ptr->crc)) ||
 201
 202             flash_write((char *)&obsolete_flag,
 203                         (ulong)&(flash_addr->flags),
 204                         sizeof(flash_addr->flags)) ||
 205
 206             flash_write((char *)&active_flag,
 207                         (ulong)&(flash_addr_new->flags),
 208                         sizeof(flash_addr_new->flags)))
 209         {
 210                 flash_perror (rc);
 211                 goto Done;
 212         }
 213         puts ("done\n");
 214
 215         {
 216                 env_t * etmp = flash_addr;
 217                 ulong ltmp = end_addr;
 218
 219                 flash_addr = flash_addr_new;
 220                 flash_addr_new = etmp;
 221
 222                 end_addr = end_addr_new;
 223                 end_addr_new = ltmp;
 224         }
 225
 226         rc = 0;
 227 Done:
 228
 229         /* try to re-protect */
 230         (void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
 231         (void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 232
 233         return rc;
 234 }
 235 #endif /* CMD_SAVEENV */
 236
 237 #else /* ! CFG_ENV_ADDR_REDUND */
 238
 239 int  env_init(void)
 240 {
 241         DECLARE_GLOBAL_DATA_PTR;
 242
 243         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 244                 gd->env_addr  = (ulong)&(env_ptr->data);
 245                 gd->env_valid = 1;
 246         } else {
 247                 gd->env_addr  = (ulong)&default_environment[0];
 248                 gd->env_valid = 0;
 249         }
 250
 251         return (0);
 252 }
 253
 254 #ifdef CMD_SAVEENV
 255
 256 int saveenv(void)
 257 {
 258         int     len, rc;
 259         ulong   end_addr;
 260         ulong   flash_sect_addr;
 261 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 262         ulong   flash_offset;
 263         uchar   env_buffer[CFG_ENV_SECT_SIZE];
 264 #else
 265         uchar *env_buffer = (char *)env_ptr;
 266 #endif  /* CFG_ENV_SECT_SIZE */
 267         int rcode = 0;
 268
 269 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 270
 271         flash_offset    = ((ulong)flash_addr) & (CFG_ENV_SECT_SIZE-1);
 272         flash_sect_addr = ((ulong)flash_addr) & ~(CFG_ENV_SECT_SIZE-1);
 273
 274         debug ( "copy old content: "
 275                 "sect_addr: %08lX  env_addr: %08lX  offset: %08lX\n",
 276                 flash_sect_addr, (ulong)flash_addr, flash_offset);
 277
 278         /* copy old contents to temporary buffer */
 279         memcpy (env_buffer, (void *)flash_sect_addr, CFG_ENV_SECT_SIZE);
 280
 281         /* copy current environment to temporary buffer */
 282         memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
 283                 env_ptr,
 284                 CFG_ENV_SIZE);
 285
 286         len      = CFG_ENV_SECT_SIZE;
 287 #else
 288         flash_sect_addr = (ulong)flash_addr;
 289         len      = CFG_ENV_SIZE;
 290 #endif  /* CFG_ENV_SECT_SIZE */
 291
 292 #ifndef CONFIG_INFERNO
 293         end_addr = flash_sect_addr + len - 1;
 294 #else
 295         /* this is the last sector, and the size is hardcoded here */
 296         /* otherwise we will get stack problems on loading 128 KB environment */
 297         end_addr = flash_sect_addr + 0x20000 - 1;
 298 #endif
 299
 300         debug ("Protect off %08lX ... %08lX\n",
 301                 (ulong)flash_sect_addr, end_addr);
 302
 303         if (flash_sect_protect (0, flash_sect_addr, end_addr))
 304                 return 1;
 305
 306         puts ("Erasing Flash...");
 307         if (flash_sect_erase (flash_sect_addr, end_addr))
 308                 return 1;
 309
 310         puts ("Writing to Flash... ");
 311         rc = flash_write(env_buffer, flash_sect_addr, len);
 312         if (rc != 0) {
 313                 flash_perror (rc);
 314                 rcode = 1;
 315         } else {
 316                 puts ("done\n");
 317         }
 318
 319         /* try to re-protect */
 320         (void) flash_sect_protect (1, flash_sect_addr, end_addr);
 321         return rcode;
 322 }
 323
 324 #endif /* CMD_SAVEENV */
 325
 326 #endif /* CFG_ENV_ADDR_REDUND */
 327
 328 void env_relocate_spec (void)
 329 {
 330 #if !defined(ENV_IS_EMBEDDED) || defined(CFG_ENV_ADDR_REDUND)
 331 #ifdef CFG_ENV_ADDR_REDUND
 332         DECLARE_GLOBAL_DATA_PTR;
 333
 334         if (gd->env_addr != (ulong)&(flash_addr->data))
 335         {
 336                 env_t * etmp = flash_addr;
 337                 ulong ltmp = end_addr;
 338
 339                 flash_addr = flash_addr_new;
 340                 flash_addr_new = etmp;
 341
 342                 end_addr = end_addr_new;
 343                 end_addr_new = ltmp;
 344         }
 345
 346         if (flash_addr_new->flags != obsolete_flag &&
 347             crc32(0, flash_addr_new->data, ENV_SIZE) ==
 348             flash_addr_new->crc)
 349         {
 350                 gd->env_valid = 2;
 351                 flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new);
 352                 flash_write((char *)&obsolete_flag,
 353                             (ulong)&(flash_addr_new->flags),
 354                             sizeof(flash_addr_new->flags));
 355                 flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 356         }
 357
 358         if (flash_addr->flags != active_flag &&
 359             (flash_addr->flags & active_flag) == active_flag)
 360         {
 361                 gd->env_valid = 2;
 362                 flash_sect_protect (0, (ulong)flash_addr, end_addr);
 363                 flash_write((char *)&active_flag,
 364                             (ulong)&(flash_addr->flags),
 365                             sizeof(flash_addr->flags));
 366                 flash_sect_protect (1, (ulong)flash_addr, end_addr);
 367         }
 368
 369         if (gd->env_valid == 2)
 370                 puts ("*** Warning - some problems detected "
 371                       "reading environment; recovered successfully\n\n");
 372 #endif /* CFG_ENV_ADDR_REDUND */
 373         memcpy (env_ptr, (void*)flash_addr, CFG_ENV_SIZE);
 374 #endif /* ! ENV_IS_EMBEDDED || CFG_ENV_ADDR_REDUND */
 375 }
 376
 377 #endif /* CFG_ENV_IS_IN_FLASH) */