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 #include <malloc.h>
  38
  39 #if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_FLASH)) == (CFG_CMD_ENV|CFG_CMD_FLASH))
  40 #define CMD_SAVEENV
  41 #elif defined(CFG_ENV_ADDR_REDUND)
  42 #error Cannot use CFG_ENV_ADDR_REDUND without CFG_CMD_ENV & CFG_CMD_FLASH
  43 #endif
  44
  45 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND < CFG_ENV_SIZE)
  46 #error CFG_ENV_SIZE_REDUND should not be less then CFG_ENV_SIZE
  47 #endif
  48
  49 #ifdef CONFIG_INFERNO
  50 # ifdef CFG_ENV_ADDR_REDUND
  51 #error CFG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
  52 # endif
  53 #endif
  54
  55 char * env_name_spec = "Flash";
  56
  57 #ifdef ENV_IS_EMBEDDED
  58
  59 extern uchar environment[];
  60 env_t *env_ptr = (env_t *)(&environment[0]);
  61
  62 #ifdef CMD_SAVEENV
  63 /* static env_t *flash_addr = (env_t *)(&environment[0]);-broken on ARM-wd-*/
  64 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  65 #endif
  66
  67 #else /* ! ENV_IS_EMBEDDED */
  68
  69 env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
  70 #ifdef CMD_SAVEENV
  71 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  72 #endif
  73
  74 #endif /* ENV_IS_EMBEDDED */
  75
  76 #ifdef CFG_ENV_ADDR_REDUND
  77 static env_t *flash_addr_new = (env_t *)CFG_ENV_ADDR_REDUND;
  78
  79 /* CFG_ENV_ADDR is supposed to be on sector boundary */
  80 static ulong end_addr = CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1;
  81 static ulong end_addr_new = CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1;
  82
  83 static uchar active_flag = 1;
  84 static uchar obsolete_flag = 0;
  85 #endif
  86
  87 extern uchar default_environment[];
  88 extern int default_environment_size;
  89
  90
  91 uchar env_get_char_spec (int index)
  92 {
  93         DECLARE_GLOBAL_DATA_PTR;
  94
  95         return ( *((uchar *)(gd->env_addr + index)) );
  96 }
  97
  98 #ifdef CFG_ENV_ADDR_REDUND
  99
 100 int  env_init(void)
 101 {
 102         DECLARE_GLOBAL_DATA_PTR;
 103
 104         int crc1_ok =
 105                 (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
 106         int crc2_ok =
 107                 (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
 108
 109         uchar flag1 = flash_addr->flags;
 110         uchar flag2 = flash_addr_new->flags;
 111
 112         ulong addr_default = (ulong)&default_environment[0];
 113         ulong addr1 = (ulong)&(flash_addr->data);
 114         ulong addr2 = (ulong)&(flash_addr_new->data);
 115
 116         if (crc1_ok && ! crc2_ok)
 117         {
 118                 gd->env_addr  = addr1;
 119                 gd->env_valid = 1;
 120         }
 121         else if (! crc1_ok && crc2_ok)
 122         {
 123                 gd->env_addr  = addr2;
 124                 gd->env_valid = 1;
 125         }
 126         else if (! crc1_ok && ! crc2_ok)
 127         {
 128                 gd->env_addr  = addr_default;
 129                 gd->env_valid = 0;
 130         }
 131         else if (flag1 == active_flag && flag2 == obsolete_flag)
 132         {
 133                 gd->env_addr  = addr1;
 134                 gd->env_valid = 1;
 135         }
 136         else if (flag1 == obsolete_flag && flag2 == active_flag)
 137         {
 138                 gd->env_addr  = addr2;
 139                 gd->env_valid = 1;
 140         }
 141         else if (flag1 == flag2)
 142         {
 143                 gd->env_addr  = addr1;
 144                 gd->env_valid = 2;
 145         }
 146         else if (flag1 == 0xFF)
 147         {
 148                 gd->env_addr  = addr1;
 149                 gd->env_valid = 2;
 150         }
 151         else if (flag2 == 0xFF)
 152         {
 153                 gd->env_addr  = addr2;
 154                 gd->env_valid = 2;
 155         }
 156
 157         return (0);
 158 }
 159
 160 #ifdef CMD_SAVEENV
 161 int saveenv(void)
 162 {
 163         int rc = 1;
 164         ulong up_data = 0;
 165         char *saved_data = NULL;
 166
 167         debug ("Protect off %08lX ... %08lX\n",
 168                 (ulong)flash_addr, end_addr);
 169
 170         if (flash_sect_protect (0, (ulong)flash_addr, end_addr)) {
 171                 goto Done;
 172         }
 173
 174         debug ("Protect off %08lX ... %08lX\n",
 175                 (ulong)flash_addr_new, end_addr_new);
 176
 177         if (flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new)) {
 178                 goto Done;
 179         }
 180
 181 #if CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
 182         up_data = (end_addr_new + 1 - ((long)flash_addr_new + CFG_ENV_SIZE));
 183         debug ("Data to save 0x%x\n", up_data);
 184         if (up_data) {
 185                 if ((saved_data = malloc(up_data)) == NULL) {
 186                         printf("Unable to save the rest of sector (%ld)\n",
 187                                 up_data);
 188                         goto Done;
 189                 }
 190                 memcpy(saved_data,
 191                         (void *)((long)flash_addr_new + CFG_ENV_SIZE), up_data);
 192                 debug ("Data (start 0x%x, len 0x%x) saved at 0x%x\n",
 193                            (long)flash_addr_new + CFG_ENV_SIZE,
 194                                 up_data, saved_data);
 195         }
 196 #endif
 197         puts ("Erasing Flash...");
 198         debug (" %08lX ... %08lX ...",
 199                 (ulong)flash_addr_new, end_addr_new);
 200
 201         if (flash_sect_erase ((ulong)flash_addr_new, end_addr_new)) {
 202                 goto Done;
 203         }
 204
 205         puts ("Writing to Flash... ");
 206         debug (" %08lX ... %08lX ...",
 207                 (ulong)&(flash_addr_new->data),
 208                 sizeof(env_ptr->data)+(ulong)&(flash_addr_new->data));
 209         if (flash_write(env_ptr->data,
 210                         (ulong)&(flash_addr_new->data),
 211                         sizeof(env_ptr->data)) ||
 212
 213             flash_write((char *)&(env_ptr->crc),
 214                         (ulong)&(flash_addr_new->crc),
 215                         sizeof(env_ptr->crc)) ||
 216
 217             flash_write((char *)&obsolete_flag,
 218                         (ulong)&(flash_addr->flags),
 219                         sizeof(flash_addr->flags)) ||
 220
 221             flash_write((char *)&active_flag,
 222                         (ulong)&(flash_addr_new->flags),
 223                         sizeof(flash_addr_new->flags)))
 224         {
 225                 flash_perror (rc);
 226                 goto Done;
 227         }
 228         puts ("done\n");
 229
 230 #if CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
 231         if (up_data) { /* restore the rest of sector */
 232                 debug ("Restoring the rest of data to 0x%x len 0x%x\n",
 233                            (long)flash_addr_new + CFG_ENV_SIZE, up_data);
 234                 if (flash_write(saved_data,
 235                                 (long)flash_addr_new + CFG_ENV_SIZE,
 236                                 up_data)) {
 237                         flash_perror(rc);
 238                         goto Done;
 239                 }
 240         }
 241 #endif
 242         {
 243                 env_t * etmp = flash_addr;
 244                 ulong ltmp = end_addr;
 245
 246                 flash_addr = flash_addr_new;
 247                 flash_addr_new = etmp;
 248
 249                 end_addr = end_addr_new;
 250                 end_addr_new = ltmp;
 251         }
 252
 253         rc = 0;
 254 Done:
 255
 256         if (saved_data)
 257                 free (saved_data);
 258         /* try to re-protect */
 259         (void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
 260         (void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 261
 262         return rc;
 263 }
 264 #endif /* CMD_SAVEENV */
 265
 266 #else /* ! CFG_ENV_ADDR_REDUND */
 267
 268 int  env_init(void)
 269 {
 270         DECLARE_GLOBAL_DATA_PTR;
 271
 272         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 273                 gd->env_addr  = (ulong)&(env_ptr->data);
 274                 gd->env_valid = 1;
 275         } else {
 276                 gd->env_addr  = (ulong)&default_environment[0];
 277                 gd->env_valid = 0;
 278         }
 279
 280         return (0);
 281 }
 282
 283 #ifdef CMD_SAVEENV
 284
 285 int saveenv(void)
 286 {
 287         int     len, rc;
 288         ulong   end_addr;
 289         ulong   flash_sect_addr;
 290 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 291         ulong   flash_offset;
 292         uchar   env_buffer[CFG_ENV_SECT_SIZE];
 293 #else
 294         uchar *env_buffer = (char *)env_ptr;
 295 #endif  /* CFG_ENV_SECT_SIZE */
 296         int rcode = 0;
 297
 298 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 299
 300         flash_offset    = ((ulong)flash_addr) & (CFG_ENV_SECT_SIZE-1);
 301         flash_sect_addr = ((ulong)flash_addr) & ~(CFG_ENV_SECT_SIZE-1);
 302
 303         debug ( "copy old content: "
 304                 "sect_addr: %08lX  env_addr: %08lX  offset: %08lX\n",
 305                 flash_sect_addr, (ulong)flash_addr, flash_offset);
 306
 307         /* copy old contents to temporary buffer */
 308         memcpy (env_buffer, (void *)flash_sect_addr, CFG_ENV_SECT_SIZE);
 309
 310         /* copy current environment to temporary buffer */
 311         memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
 312                 env_ptr,
 313                 CFG_ENV_SIZE);
 314
 315         len      = CFG_ENV_SECT_SIZE;
 316 #else
 317         flash_sect_addr = (ulong)flash_addr;
 318         len      = CFG_ENV_SIZE;
 319 #endif  /* CFG_ENV_SECT_SIZE */
 320
 321 #ifndef CONFIG_INFERNO
 322         end_addr = flash_sect_addr + len - 1;
 323 #else
 324         /* this is the last sector, and the size is hardcoded here */
 325         /* otherwise we will get stack problems on loading 128 KB environment */
 326         end_addr = flash_sect_addr + 0x20000 - 1;
 327 #endif
 328
 329         debug ("Protect off %08lX ... %08lX\n",
 330                 (ulong)flash_sect_addr, end_addr);
 331
 332         if (flash_sect_protect (0, flash_sect_addr, end_addr))
 333                 return 1;
 334
 335         puts ("Erasing Flash...");
 336         if (flash_sect_erase (flash_sect_addr, end_addr))
 337                 return 1;
 338
 339         puts ("Writing to Flash... ");
 340         rc = flash_write(env_buffer, flash_sect_addr, len);
 341         if (rc != 0) {
 342                 flash_perror (rc);
 343                 rcode = 1;
 344         } else {
 345                 puts ("done\n");
 346         }
 347
 348         /* try to re-protect */
 349         (void) flash_sect_protect (1, flash_sect_addr, end_addr);
 350         return rcode;
 351 }
 352
 353 #endif /* CMD_SAVEENV */
 354
 355 #endif /* CFG_ENV_ADDR_REDUND */
 356
 357 void env_relocate_spec (void)
 358 {
 359 #if !defined(ENV_IS_EMBEDDED) || defined(CFG_ENV_ADDR_REDUND)
 360 #ifdef CFG_ENV_ADDR_REDUND
 361         DECLARE_GLOBAL_DATA_PTR;
 362
 363         if (gd->env_addr != (ulong)&(flash_addr->data))
 364         {
 365                 env_t * etmp = flash_addr;
 366                 ulong ltmp = end_addr;
 367
 368                 flash_addr = flash_addr_new;
 369                 flash_addr_new = etmp;
 370
 371                 end_addr = end_addr_new;
 372                 end_addr_new = ltmp;
 373         }
 374
 375         if (flash_addr_new->flags != obsolete_flag &&
 376             crc32(0, flash_addr_new->data, ENV_SIZE) ==
 377             flash_addr_new->crc)
 378         {
 379                 gd->env_valid = 2;
 380                 flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new);
 381                 flash_write((char *)&obsolete_flag,
 382                             (ulong)&(flash_addr_new->flags),
 383                             sizeof(flash_addr_new->flags));
 384                 flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 385         }
 386
 387         if (flash_addr->flags != active_flag &&
 388             (flash_addr->flags & active_flag) == active_flag)
 389         {
 390                 gd->env_valid = 2;
 391                 flash_sect_protect (0, (ulong)flash_addr, end_addr);
 392                 flash_write((char *)&active_flag,
 393                             (ulong)&(flash_addr->flags),
 394                             sizeof(flash_addr->flags));
 395                 flash_sect_protect (1, (ulong)flash_addr, end_addr);
 396         }
 397
 398         if (gd->env_valid == 2)
 399                 puts ("*** Warning - some problems detected "
 400                       "reading environment; recovered successfully\n\n");
 401 #endif /* CFG_ENV_ADDR_REDUND */
 402         memcpy (env_ptr, (void*)flash_addr, CFG_ENV_SIZE);
 403 #endif /* ! ENV_IS_EMBEDDED || CFG_ENV_ADDR_REDUND */
 404 }
 405
 406 #endif /* CFG_ENV_IS_IN_FLASH */