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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 /* #define DEBUG */
  12
  13 #include <common.h>
  14 #include <command.h>
  15 #include <environment.h>
  16 #include <linux/stddef.h>
  17 #include <malloc.h>
  18 #include <search.h>
  19 #include <errno.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
  24 #define CMD_SAVEENV
  25 #elif defined(CONFIG_ENV_ADDR_REDUND)
  26 #error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  27 #endif
  28
  29 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  30         (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
  31 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
  32 #endif
  33
  34 char *env_name_spec = "Flash";
  35
  36 #ifdef ENV_IS_EMBEDDED
  37 env_t *env_ptr = &environment;
  38
  39 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  40
  41 #else /* ! ENV_IS_EMBEDDED */
  42
  43 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  44 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  45 #endif /* ENV_IS_EMBEDDED */
  46
  47 #if defined(CMD_SAVEENV) || defined(CONFIG_ENV_ADDR_REDUND)
  48 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  49 static ulong end_addr = CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  50 #endif
  51
  52 #ifdef CONFIG_ENV_ADDR_REDUND
  53 static env_t *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  54
  55 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  56 static ulong end_addr_new = CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  57 #endif /* CONFIG_ENV_ADDR_REDUND */
  58
  59
  60 #ifdef CONFIG_ENV_ADDR_REDUND
  61 int env_init(void)
  62 {
  63         int crc1_ok = 0, crc2_ok = 0;
  64
  65         uchar flag1 = flash_addr->flags;
  66         uchar flag2 = flash_addr_new->flags;
  67
  68         ulong addr_default = (ulong)&default_environment[0];
  69         ulong addr1 = (ulong)&(flash_addr->data);
  70         ulong addr2 = (ulong)&(flash_addr_new->data);
  71
  72         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  73         crc2_ok =
  74                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  75
  76         if (crc1_ok && !crc2_ok) {
  77                 gd->env_addr    = addr1;
  78                 gd->env_valid   = 1;
  79         } else if (!crc1_ok && crc2_ok) {
  80                 gd->env_addr    = addr2;
  81                 gd->env_valid   = 1;
  82         } else if (!crc1_ok && !crc2_ok) {
  83                 gd->env_addr    = addr_default;
  84                 gd->env_valid   = 0;
  85         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
  86                 gd->env_addr    = addr1;
  87                 gd->env_valid   = 1;
  88         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
  89                 gd->env_addr    = addr2;
  90                 gd->env_valid   = 1;
  91         } else if (flag1 == flag2) {
  92                 gd->env_addr    = addr1;
  93                 gd->env_valid   = 2;
  94         } else if (flag1 == 0xFF) {
  95                 gd->env_addr    = addr1;
  96                 gd->env_valid   = 2;
  97         } else if (flag2 == 0xFF) {
  98                 gd->env_addr    = addr2;
  99                 gd->env_valid   = 2;
 100         }
 101
 102         return 0;
 103 }
 104
 105 #ifdef CMD_SAVEENV
 106 int saveenv(void)
 107 {
 108         env_t   env_new;
 109         char    *saved_data = NULL;
 110         char    flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 111         int     rc = 1;
 112 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 113         ulong   up_data = 0;
 114 #endif
 115
 116         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 117
 118         if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 119                 goto done;
 120
 121         debug("Protect off %08lX ... %08lX\n",
 122                 (ulong)flash_addr_new, end_addr_new);
 123
 124         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 125                 goto done;
 126
 127         rc = env_export(&env_new);
 128         if (rc)
 129                 return rc;
 130         env_new.flags   = new_flag;
 131
 132 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 133         up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 134         debug("Data to save 0x%lX\n", up_data);
 135         if (up_data) {
 136                 saved_data = malloc(up_data);
 137                 if (saved_data == NULL) {
 138                         printf("Unable to save the rest of sector (%ld)\n",
 139                                 up_data);
 140                         goto done;
 141                 }
 142                 memcpy(saved_data,
 143                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 144                         up_data);
 145                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 146                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 147                         up_data, saved_data);
 148         }
 149 #endif
 150         puts("Erasing Flash...");
 151         debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
 152
 153         if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 154                 goto done;
 155
 156         puts("Writing to Flash... ");
 157         debug(" %08lX ... %08lX ...",
 158                 (ulong)&(flash_addr_new->data),
 159                 sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 160         rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 161                          sizeof(env_new));
 162         if (rc)
 163                 goto perror;
 164
 165         rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 166                          sizeof(flash_addr->flags));
 167         if (rc)
 168                 goto perror;
 169
 170 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 171         if (up_data) { /* restore the rest of sector */
 172                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 173                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 174                 if (flash_write(saved_data,
 175                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 176                                 up_data))
 177                         goto perror;
 178         }
 179 #endif
 180         puts("done\n");
 181
 182         {
 183                 env_t *etmp = flash_addr;
 184                 ulong ltmp = end_addr;
 185
 186                 flash_addr = flash_addr_new;
 187                 flash_addr_new = etmp;
 188
 189                 end_addr = end_addr_new;
 190                 end_addr_new = ltmp;
 191         }
 192
 193         rc = 0;
 194         goto done;
 195 perror:
 196         flash_perror(rc);
 197 done:
 198         if (saved_data)
 199                 free(saved_data);
 200         /* try to re-protect */
 201         flash_sect_protect(1, (ulong)flash_addr, end_addr);
 202         flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 203
 204         return rc;
 205 }
 206 #endif /* CMD_SAVEENV */
 207
 208 #else /* ! CONFIG_ENV_ADDR_REDUND */
 209
 210 int env_init(void)
 211 {
 212         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 213                 gd->env_addr    = (ulong)&(env_ptr->data);
 214                 gd->env_valid   = 1;
 215                 return 0;
 216         }
 217
 218         gd->env_addr    = (ulong)&default_environment[0];
 219         gd->env_valid   = 0;
 220         return 0;
 221 }
 222
 223 #ifdef CMD_SAVEENV
 224 int saveenv(void)
 225 {
 226         env_t   env_new;
 227         ssize_t len;
 228         int     rc = 1;
 229         char    *res, *saved_data = NULL;
 230 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 231         ulong   up_data = 0;
 232
 233         up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 234         debug("Data to save 0x%lx\n", up_data);
 235         if (up_data) {
 236                 saved_data = malloc(up_data);
 237                 if (saved_data == NULL) {
 238                         printf("Unable to save the rest of sector (%ld)\n",
 239                                 up_data);
 240                         goto done;
 241                 }
 242                 memcpy(saved_data,
 243                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 244                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 245                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 246                         up_data,
 247                         (ulong)saved_data);
 248         }
 249 #endif  /* CONFIG_ENV_SECT_SIZE */
 250
 251         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 252
 253         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 254                 goto done;
 255
 256         rc = env_export(&env_new);
 257         if (rc)
 258                 goto done;
 259
 260         puts("Erasing Flash...");
 261         if (flash_sect_erase((long)flash_addr, end_addr))
 262                 goto done;
 263
 264         puts("Writing to Flash... ");
 265         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 266         if (rc != 0)
 267                 goto perror;
 268
 269 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 270         if (up_data) {  /* restore the rest of sector */
 271                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 272                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 273                 if (flash_write(saved_data,
 274                                 (long)flash_addr + CONFIG_ENV_SIZE,
 275                                 up_data))
 276                         goto perror;
 277         }
 278 #endif
 279         puts("done\n");
 280         rc = 0;
 281         goto done;
 282 perror:
 283         flash_perror(rc);
 284 done:
 285         if (saved_data)
 286                 free(saved_data);
 287         /* try to re-protect */
 288         flash_sect_protect(1, (long)flash_addr, end_addr);
 289         return rc;
 290 }
 291 #endif /* CMD_SAVEENV */
 292
 293 #endif /* CONFIG_ENV_ADDR_REDUND */
 294
 295 void env_relocate_spec(void)
 296 {
 297 #ifdef CONFIG_ENV_ADDR_REDUND
 298         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 299                 env_t *etmp = flash_addr;
 300                 ulong ltmp = end_addr;
 301
 302                 flash_addr = flash_addr_new;
 303                 flash_addr_new = etmp;
 304
 305                 end_addr = end_addr_new;
 306                 end_addr_new = ltmp;
 307         }
 308
 309         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 310             crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 311                 char flag = OBSOLETE_FLAG;
 312
 313                 gd->env_valid = 2;
 314                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 315                 flash_write(&flag,
 316                             (ulong)&(flash_addr_new->flags),
 317                             sizeof(flash_addr_new->flags));
 318                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 319         }
 320
 321         if (flash_addr->flags != ACTIVE_FLAG &&
 322             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 323                 char flag = ACTIVE_FLAG;
 324
 325                 gd->env_valid = 2;
 326                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 327                 flash_write(&flag,
 328                             (ulong)&(flash_addr->flags),
 329                             sizeof(flash_addr->flags));
 330                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 331         }
 332
 333         if (gd->env_valid == 2)
 334                 puts("*** Warning - some problems detected "
 335                      "reading environment; recovered successfully\n\n");
 336 #endif /* CONFIG_ENV_ADDR_REDUND */
 337
 338         env_import((char *)flash_addr, 1);
 339 }