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 CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  43 #endif
  44
  45 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  46         (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
  47 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
  48 #endif
  49
  50 char *env_name_spec = "Flash";
  51
  52 #ifdef ENV_IS_EMBEDDED
  53 env_t *env_ptr = &environment;
  54
  55 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  56
  57 #else /* ! ENV_IS_EMBEDDED */
  58
  59 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  60 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  61 #endif /* ENV_IS_EMBEDDED */
  62
  63 #if defined(CMD_SAVEENV) || defined(CONFIG_ENV_ADDR_REDUND)
  64 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  65 static ulong end_addr = CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  66 #endif
  67
  68 #ifdef CONFIG_ENV_ADDR_REDUND
  69 static env_t *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  70
  71 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  72 static ulong end_addr_new = CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  73 #endif /* CONFIG_ENV_ADDR_REDUND */
  74
  75
  76 #ifdef CONFIG_ENV_ADDR_REDUND
  77 int env_init(void)
  78 {
  79         int crc1_ok = 0, crc2_ok = 0;
  80
  81         uchar flag1 = flash_addr->flags;
  82         uchar flag2 = flash_addr_new->flags;
  83
  84         ulong addr_default = (ulong)&default_environment[0];
  85         ulong addr1 = (ulong)&(flash_addr->data);
  86         ulong addr2 = (ulong)&(flash_addr_new->data);
  87
  88         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  89         crc2_ok =
  90                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  91
  92         if (crc1_ok && !crc2_ok) {
  93                 gd->env_addr    = addr1;
  94                 gd->env_valid   = 1;
  95         } else if (!crc1_ok && crc2_ok) {
  96                 gd->env_addr    = addr2;
  97                 gd->env_valid   = 1;
  98         } else if (!crc1_ok && !crc2_ok) {
  99                 gd->env_addr    = addr_default;
 100                 gd->env_valid   = 0;
 101         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 102                 gd->env_addr    = addr1;
 103                 gd->env_valid   = 1;
 104         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 105                 gd->env_addr    = addr2;
 106                 gd->env_valid   = 1;
 107         } else if (flag1 == flag2) {
 108                 gd->env_addr    = addr1;
 109                 gd->env_valid   = 2;
 110         } else if (flag1 == 0xFF) {
 111                 gd->env_addr    = addr1;
 112                 gd->env_valid   = 2;
 113         } else if (flag2 == 0xFF) {
 114                 gd->env_addr    = addr2;
 115                 gd->env_valid   = 2;
 116         }
 117
 118         return 0;
 119 }
 120
 121 #ifdef CMD_SAVEENV
 122 int saveenv(void)
 123 {
 124         env_t   env_new;
 125         ssize_t len;
 126         char    *res, *saved_data = NULL;
 127         char    flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 128         int     rc = 1;
 129 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 130         ulong   up_data = 0;
 131 #endif
 132
 133         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 134
 135         if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 136                 goto done;
 137
 138         debug("Protect off %08lX ... %08lX\n",
 139                 (ulong)flash_addr_new, end_addr_new);
 140
 141         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 142                 goto done;
 143
 144         res = (char *)&env_new.data;
 145         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 146         if (len < 0) {
 147                 error("Cannot export environment: errno = %d\n", errno);
 148                 goto done;
 149         }
 150         env_new.crc     = crc32(0, env_new.data, ENV_SIZE);
 151         env_new.flags   = new_flag;
 152
 153 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 154         up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 155         debug("Data to save 0x%lX\n", up_data);
 156         if (up_data) {
 157                 saved_data = malloc(up_data);
 158                 if (saved_data == NULL) {
 159                         printf("Unable to save the rest of sector (%ld)\n",
 160                                 up_data);
 161                         goto done;
 162                 }
 163                 memcpy(saved_data,
 164                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 165                         up_data);
 166                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 167                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 168                         up_data, saved_data);
 169         }
 170 #endif
 171         puts("Erasing Flash...");
 172         debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
 173
 174         if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 175                 goto done;
 176
 177         puts("Writing to Flash... ");
 178         debug(" %08lX ... %08lX ...",
 179                 (ulong)&(flash_addr_new->data),
 180                 sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 181         rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 182                          sizeof(env_new));
 183         if (rc)
 184                 goto perror;
 185
 186         rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 187                          sizeof(flash_addr->flags));
 188         if (rc)
 189                 goto perror;
 190
 191 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 192         if (up_data) { /* restore the rest of sector */
 193                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 194                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 195                 if (flash_write(saved_data,
 196                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 197                                 up_data))
 198                         goto perror;
 199         }
 200 #endif
 201         puts("done\n");
 202
 203         {
 204                 env_t *etmp = flash_addr;
 205                 ulong ltmp = end_addr;
 206
 207                 flash_addr = flash_addr_new;
 208                 flash_addr_new = etmp;
 209
 210                 end_addr = end_addr_new;
 211                 end_addr_new = ltmp;
 212         }
 213
 214         rc = 0;
 215         goto done;
 216 perror:
 217         flash_perror(rc);
 218 done:
 219         if (saved_data)
 220                 free(saved_data);
 221         /* try to re-protect */
 222         flash_sect_protect(1, (ulong)flash_addr, end_addr);
 223         flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 224
 225         return rc;
 226 }
 227 #endif /* CMD_SAVEENV */
 228
 229 #else /* ! CONFIG_ENV_ADDR_REDUND */
 230
 231 int env_init(void)
 232 {
 233         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 234                 gd->env_addr    = (ulong)&(env_ptr->data);
 235                 gd->env_valid   = 1;
 236                 return 0;
 237         }
 238
 239         gd->env_addr    = (ulong)&default_environment[0];
 240         gd->env_valid   = 0;
 241         return 0;
 242 }
 243
 244 #ifdef CMD_SAVEENV
 245 int saveenv(void)
 246 {
 247         env_t   env_new;
 248         ssize_t len;
 249         int     rc = 1;
 250         char    *res, *saved_data = NULL;
 251 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 252         ulong   up_data = 0;
 253
 254         up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 255         debug("Data to save 0x%lx\n", up_data);
 256         if (up_data) {
 257                 saved_data = malloc(up_data);
 258                 if (saved_data == NULL) {
 259                         printf("Unable to save the rest of sector (%ld)\n",
 260                                 up_data);
 261                         goto done;
 262                 }
 263                 memcpy(saved_data,
 264                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 265                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 266                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 267                         up_data,
 268                         (ulong)saved_data);
 269         }
 270 #endif  /* CONFIG_ENV_SECT_SIZE */
 271
 272         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 273
 274         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 275                 goto done;
 276
 277         res = (char *)&env_new.data;
 278         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 279         if (len < 0) {
 280                 error("Cannot export environment: errno = %d\n", errno);
 281                 goto done;
 282         }
 283         env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 284
 285         puts("Erasing Flash...");
 286         if (flash_sect_erase((long)flash_addr, end_addr))
 287                 goto done;
 288
 289         puts("Writing to Flash... ");
 290         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 291         if (rc != 0)
 292                 goto perror;
 293
 294 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 295         if (up_data) {  /* restore the rest of sector */
 296                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 297                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 298                 if (flash_write(saved_data,
 299                                 (long)flash_addr + CONFIG_ENV_SIZE,
 300                                 up_data))
 301                         goto perror;
 302         }
 303 #endif
 304         puts("done\n");
 305         rc = 0;
 306         goto done;
 307 perror:
 308         flash_perror(rc);
 309 done:
 310         if (saved_data)
 311                 free(saved_data);
 312         /* try to re-protect */
 313         flash_sect_protect(1, (long)flash_addr, end_addr);
 314         return rc;
 315 }
 316 #endif /* CMD_SAVEENV */
 317
 318 #endif /* CONFIG_ENV_ADDR_REDUND */
 319
 320 void env_relocate_spec(void)
 321 {
 322 #ifdef CONFIG_ENV_ADDR_REDUND
 323         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 324                 env_t *etmp = flash_addr;
 325                 ulong ltmp = end_addr;
 326
 327                 flash_addr = flash_addr_new;
 328                 flash_addr_new = etmp;
 329
 330                 end_addr = end_addr_new;
 331                 end_addr_new = ltmp;
 332         }
 333
 334         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 335             crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 336                 char flag = OBSOLETE_FLAG;
 337
 338                 gd->env_valid = 2;
 339                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 340                 flash_write(&flag,
 341                             (ulong)&(flash_addr_new->flags),
 342                             sizeof(flash_addr_new->flags));
 343                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 344         }
 345
 346         if (flash_addr->flags != ACTIVE_FLAG &&
 347             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 348                 char flag = ACTIVE_FLAG;
 349
 350                 gd->env_valid = 2;
 351                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 352                 flash_write(&flag,
 353                             (ulong)&(flash_addr->flags),
 354                             sizeof(flash_addr->flags));
 355                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 356         }
 357
 358         if (gd->env_valid == 2)
 359                 puts("*** Warning - some problems detected "
 360                      "reading environment; recovered successfully\n\n");
 361 #endif /* CONFIG_ENV_ADDR_REDUND */
 362
 363         env_import((char *)flash_addr, 1);
 364 }