common/env_flash.c

   1 /*
   2  * (C) Copyright 2000-2010
   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 #include <command.h>
  31 #include <environment.h>
  32 #include <linux/stddef.h>
  33 #include <malloc.h>
  34 #include <search.h>
  35 #include <errno.h>
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
  40 #define CMD_SAVEENV
  41 #elif defined(CONFIG_ENV_ADDR_REDUND)
  42 #error Cannot use CONFIG_ENV_ADDR_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  43 #endif
  44
  45 #if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
  46 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
  47 #endif
  48
  49 char * env_name_spec = "Flash";
  50
  51 #ifdef ENV_IS_EMBEDDED
  52
  53 extern uchar environment[];
  54 env_t *env_ptr = (env_t *)(&environment[0]);
  55
  56 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  57
  58 #else /* ! ENV_IS_EMBEDDED */
  59
  60 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  61 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  62
  63 #endif /* ENV_IS_EMBEDDED */
  64
  65 #if defined(CMD_SAVEENV) || defined(CONFIG_ENV_ADDR_REDUND)
  66 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  67 static ulong end_addr = CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  68 #endif
  69
  70 #ifdef CONFIG_ENV_ADDR_REDUND
  71 static env_t *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  72
  73 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  74 static ulong end_addr_new = CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  75 #endif /* CONFIG_ENV_ADDR_REDUND */
  76
  77 extern const uchar default_environment[];
  78
  79
  80 uchar env_get_char_spec(int index)
  81 {
  82         return (*((uchar *)(gd->env_addr + index)));
  83 }
  84
  85 #ifdef CONFIG_ENV_ADDR_REDUND
  86
  87 int  env_init(void)
  88 {
  89         int crc1_ok = 0, crc2_ok = 0;
  90
  91         uchar flag1 = flash_addr->flags;
  92         uchar flag2 = flash_addr_new->flags;
  93
  94         ulong addr_default = (ulong)&default_environment[0];
  95         ulong addr1 = (ulong)&(flash_addr->data);
  96         ulong addr2 = (ulong)&(flash_addr_new->data);
  97
  98         crc1_ok = (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
  99         crc2_ok = (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
 100
 101         if (crc1_ok && ! crc2_ok) {
 102                 gd->env_addr  = addr1;
 103                 gd->env_valid = 1;
 104         } else if (! crc1_ok && crc2_ok) {
 105                 gd->env_addr  = addr2;
 106                 gd->env_valid = 1;
 107         } else if (! crc1_ok && ! crc2_ok) {
 108                 gd->env_addr  = addr_default;
 109                 gd->env_valid = 0;
 110         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 111                 gd->env_addr  = addr1;
 112                 gd->env_valid = 1;
 113         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 114                 gd->env_addr  = addr2;
 115                 gd->env_valid = 1;
 116         } else if (flag1 == flag2) {
 117                 gd->env_addr  = addr1;
 118                 gd->env_valid = 2;
 119         } else if (flag1 == 0xFF) {
 120                 gd->env_addr  = addr1;
 121                 gd->env_valid = 2;
 122         } else if (flag2 == 0xFF) {
 123                 gd->env_addr  = addr2;
 124                 gd->env_valid = 2;
 125         }
 126
 127         return 0;
 128 }
 129
 130 #ifdef CMD_SAVEENV
 131 int saveenv(void)
 132 {
 133         env_t   env_new;
 134         ssize_t len;
 135         char    *saved_data = NULL;
 136         char    *res;
 137         int     rc = 1;
 138         char    flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 139 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 140         ulong   up_data = 0;
 141 #endif
 142
 143         debug("Protect off %08lX ... %08lX\n",
 144                 (ulong)flash_addr, end_addr);
 145
 146         if (flash_sect_protect(0, (ulong)flash_addr, end_addr)) {
 147                 goto done;
 148         }
 149
 150         debug("Protect off %08lX ... %08lX\n",
 151                 (ulong)flash_addr_new, end_addr_new);
 152
 153         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new)) {
 154                 goto done;
 155         }
 156
 157         res = (char *)&env_new.data;
 158         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 159         if (len < 0) {
 160                 error("Cannot export environment: errno = %d\n", errno);
 161                 goto done;
 162         }
 163         env_new.crc   = crc32(0, env_new.data, ENV_SIZE);
 164         env_new.flags = new_flag;
 165
 166 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 167         up_data = (end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE));
 168         debug("Data to save 0x%lX\n", up_data);
 169         if (up_data) {
 170                 if ((saved_data = malloc(up_data)) == NULL) {
 171                         printf("Unable to save the rest of sector (%ld)\n",
 172                                 up_data);
 173                         goto done;
 174                 }
 175                 memcpy(saved_data,
 176                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE), up_data);
 177                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 178                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 179                         up_data, saved_data);
 180         }
 181 #endif
 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 ((rc = flash_write((char *)&env_new,
 195                         (ulong)flash_addr_new,
 196                         sizeof(env_new))) ||
 197             (rc = flash_write(&flag,
 198                         (ulong)&(flash_addr->flags),
 199                         sizeof(flash_addr->flags))) ) {
 200                 flash_perror(rc);
 201                 goto done;
 202         }
 203
 204 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 205         if (up_data) { /* restore the rest of sector */
 206                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 207                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 208                 if (flash_write(saved_data,
 209                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 210                                 up_data)) {
 211                         flash_perror(rc);
 212                         goto done;
 213                 }
 214         }
 215 #endif
 216         puts("done\n");
 217
 218         {
 219                 env_t * etmp = flash_addr;
 220                 ulong ltmp = end_addr;
 221
 222                 flash_addr = flash_addr_new;
 223                 flash_addr_new = etmp;
 224
 225                 end_addr = end_addr_new;
 226                 end_addr_new = ltmp;
 227         }
 228
 229         rc = 0;
 230 done:
 231         if (saved_data)
 232                 free(saved_data);
 233         /* try to re-protect */
 234         (void) flash_sect_protect(1, (ulong)flash_addr, end_addr);
 235         (void) flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 236
 237         return rc;
 238 }
 239 #endif /* CMD_SAVEENV */
 240
 241 #else /* ! CONFIG_ENV_ADDR_REDUND */
 242
 243 int  env_init(void)
 244 {
 245         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 246                 gd->env_addr  = (ulong)&(env_ptr->data);
 247                 gd->env_valid = 1;
 248                 return(0);
 249         }
 250
 251         gd->env_addr  = (ulong)&default_environment[0];
 252         gd->env_valid = 0;
 253         return 0;
 254 }
 255
 256 #ifdef CMD_SAVEENV
 257
 258 int saveenv(void)
 259 {
 260         env_t   env_new;
 261         ssize_t len;
 262         int     rc = 1;
 263         char    *res;
 264         char    *saved_data = NULL;
 265 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 266         ulong   up_data = 0;
 267
 268         up_data = (end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE));
 269         debug("Data to save 0x%lx\n", up_data);
 270         if (up_data) {
 271                 if ((saved_data = malloc(up_data)) == NULL) {
 272                         printf("Unable to save the rest of sector (%ld)\n",
 273                                 up_data);
 274                         goto done;
 275                 }
 276                 memcpy(saved_data,
 277                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 278                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 279                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 280                         up_data,
 281                         (ulong)saved_data);
 282         }
 283 #endif  /* CONFIG_ENV_SECT_SIZE */
 284
 285         debug("Protect off %08lX ... %08lX\n",
 286                 (ulong)flash_addr, end_addr);
 287
 288         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 289                 goto done;
 290
 291         res = (char *)&env_new.data;
 292         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 293         if (len < 0) {
 294                 error("Cannot export environment: errno = %d\n", errno);
 295                 goto done;
 296         }
 297         env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 298
 299         puts("Erasing Flash...");
 300         if (flash_sect_erase((long)flash_addr, end_addr))
 301                 goto done;
 302
 303         puts("Writing to Flash... ");
 304         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 305         if (rc != 0) {
 306                 flash_perror(rc);
 307                 goto done;
 308         }
 309 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 310         if (up_data) {  /* restore the rest of sector */
 311                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 312                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 313                 if (flash_write(saved_data,
 314                                 (long)flash_addr + CONFIG_ENV_SIZE,
 315                                 up_data)) {
 316                         flash_perror(rc);
 317                         goto done;
 318                 }
 319         }
 320 #endif
 321         puts("done\n");
 322         rc = 0;
 323 done:
 324         if (saved_data)
 325                 free(saved_data);
 326         /* try to re-protect */
 327         (void) flash_sect_protect(1, (long)flash_addr, end_addr);
 328         return rc;
 329 }
 330
 331 #endif /* CMD_SAVEENV */
 332
 333 #endif /* CONFIG_ENV_ADDR_REDUND */
 334
 335 void env_relocate_spec(void)
 336 {
 337 #ifdef CONFIG_ENV_ADDR_REDUND
 338         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 339                 env_t *etmp = flash_addr;
 340                 ulong ltmp = end_addr;
 341
 342                 flash_addr = flash_addr_new;
 343                 flash_addr_new = etmp;
 344
 345                 end_addr = end_addr_new;
 346                 end_addr_new = ltmp;
 347         }
 348
 349         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 350             crc32(0, flash_addr_new->data, ENV_SIZE) ==
 351             flash_addr_new->crc) {
 352                 char flag = OBSOLETE_FLAG;
 353
 354                 gd->env_valid = 2;
 355                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 356                 flash_write(&flag,
 357                             (ulong)&(flash_addr_new->flags),
 358                             sizeof(flash_addr_new->flags));
 359                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 360         }
 361
 362         if (flash_addr->flags != ACTIVE_FLAG &&
 363             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 364                 char flag = ACTIVE_FLAG;
 365
 366                 gd->env_valid = 2;
 367                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 368                 flash_write(&flag,
 369                             (ulong)&(flash_addr->flags),
 370                             sizeof(flash_addr->flags));
 371                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 372         }
 373
 374         if (gd->env_valid == 2)
 375                 puts ("*** Warning - some problems detected "
 376                       "reading environment; recovered successfully\n\n");
 377 #endif /* CONFIG_ENV_ADDR_REDUND */
 378
 379         env_import((char *)flash_addr, 1);
 380 }