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 #ifndef CONFIG_SPL_BUILD
  24 # if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
  25 #  define CMD_SAVEENV
  26 # elif defined(CONFIG_ENV_ADDR_REDUND)
  27 #  error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  28 # endif
  29 #endif
  30
  31 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  32         (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
  33 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
  34 #endif
  35
  36 /* TODO(sjg@chromium.org): Figure out all these special cases */
  37 #if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
  38         !defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
  39         !defined(CONFIG_TARGET_EDMINIV2)) || \
  40         !defined(CONFIG_SPL_BUILD)
  41 #define LOADENV
  42 #endif
  43
  44 #if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
  45 #define INITENV
  46 #endif
  47
  48 #ifdef ENV_IS_EMBEDDED
  49 env_t *env_ptr = &environment;
  50
  51 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  52
  53 #else /* ! ENV_IS_EMBEDDED */
  54
  55 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  56 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  57 #endif /* ENV_IS_EMBEDDED */
  58
  59 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  60 static ulong __maybe_unused end_addr =
  61                 CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  62
  63 #ifdef CONFIG_ENV_ADDR_REDUND
  64
  65 static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  66
  67 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  68 static ulong __maybe_unused end_addr_new =
  69                 CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  70 #endif /* CONFIG_ENV_ADDR_REDUND */
  71
  72 #ifdef CONFIG_ENV_ADDR_REDUND
  73 #ifdef INITENV
  74 static int env_flash_init(void)
  75 {
  76         int crc1_ok = 0, crc2_ok = 0;
  77
  78         uchar flag1 = flash_addr->flags;
  79         uchar flag2 = flash_addr_new->flags;
  80
  81         ulong addr_default = (ulong)&default_environment[0];
  82         ulong addr1 = (ulong)&(flash_addr->data);
  83         ulong addr2 = (ulong)&(flash_addr_new->data);
  84
  85         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  86         crc2_ok =
  87                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  88
  89         if (crc1_ok && !crc2_ok) {
  90                 gd->env_addr    = addr1;
  91                 gd->env_valid   = ENV_VALID;
  92         } else if (!crc1_ok && crc2_ok) {
  93                 gd->env_addr    = addr2;
  94                 gd->env_valid   = ENV_VALID;
  95         } else if (!crc1_ok && !crc2_ok) {
  96                 gd->env_addr    = addr_default;
  97                 gd->env_valid   = ENV_INVALID;
  98         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
  99                 gd->env_addr    = addr1;
 100                 gd->env_valid   = ENV_VALID;
 101         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 102                 gd->env_addr    = addr2;
 103                 gd->env_valid   = ENV_VALID;
 104         } else if (flag1 == flag2) {
 105                 gd->env_addr    = addr1;
 106                 gd->env_valid   = ENV_REDUND;
 107         } else if (flag1 == 0xFF) {
 108                 gd->env_addr    = addr1;
 109                 gd->env_valid   = ENV_REDUND;
 110         } else if (flag2 == 0xFF) {
 111                 gd->env_addr    = addr2;
 112                 gd->env_valid   = ENV_REDUND;
 113         }
 114
 115         return 0;
 116 }
 117 #endif
 118
 119 #ifdef CMD_SAVEENV
 120 static int env_flash_save(void)
 121 {
 122         env_t   env_new;
 123         char    *saved_data = NULL;
 124         char    flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 125         int     rc = 1;
 126 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 127         ulong   up_data = 0;
 128 #endif
 129
 130         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 131
 132         if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 133                 goto done;
 134
 135         debug("Protect off %08lX ... %08lX\n",
 136                 (ulong)flash_addr_new, end_addr_new);
 137
 138         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 139                 goto done;
 140
 141         rc = env_export(&env_new);
 142         if (rc)
 143                 return rc;
 144         env_new.flags   = new_flag;
 145
 146 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 147         up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 148         debug("Data to save 0x%lX\n", up_data);
 149         if (up_data) {
 150                 saved_data = malloc(up_data);
 151                 if (saved_data == NULL) {
 152                         printf("Unable to save the rest of sector (%ld)\n",
 153                                 up_data);
 154                         goto done;
 155                 }
 156                 memcpy(saved_data,
 157                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 158                         up_data);
 159                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 160                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 161                         up_data, saved_data);
 162         }
 163 #endif
 164         puts("Erasing Flash...");
 165         debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
 166
 167         if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 168                 goto done;
 169
 170         puts("Writing to Flash... ");
 171         debug(" %08lX ... %08lX ...",
 172                 (ulong)&(flash_addr_new->data),
 173                 sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 174         rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 175                          sizeof(env_new));
 176         if (rc)
 177                 goto perror;
 178
 179         rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 180                          sizeof(flash_addr->flags));
 181         if (rc)
 182                 goto perror;
 183
 184 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 185         if (up_data) { /* restore the rest of sector */
 186                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 187                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 188                 if (flash_write(saved_data,
 189                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 190                                 up_data))
 191                         goto perror;
 192         }
 193 #endif
 194         puts("done\n");
 195
 196         {
 197                 env_t *etmp = flash_addr;
 198                 ulong ltmp = end_addr;
 199
 200                 flash_addr = flash_addr_new;
 201                 flash_addr_new = etmp;
 202
 203                 end_addr = end_addr_new;
 204                 end_addr_new = ltmp;
 205         }
 206
 207         rc = 0;
 208         goto done;
 209 perror:
 210         flash_perror(rc);
 211 done:
 212         if (saved_data)
 213                 free(saved_data);
 214         /* try to re-protect */
 215         flash_sect_protect(1, (ulong)flash_addr, end_addr);
 216         flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 217
 218         return rc;
 219 }
 220 #endif /* CMD_SAVEENV */
 221
 222 #else /* ! CONFIG_ENV_ADDR_REDUND */
 223
 224 #ifdef INITENV
 225 static int env_flash_init(void)
 226 {
 227         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 228                 gd->env_addr    = (ulong)&(env_ptr->data);
 229                 gd->env_valid   = ENV_VALID;
 230                 return 0;
 231         }
 232
 233         gd->env_addr    = (ulong)&default_environment[0];
 234         gd->env_valid   = ENV_INVALID;
 235         return 0;
 236 }
 237 #endif
 238
 239 #ifdef CMD_SAVEENV
 240 static int env_flash_save(void)
 241 {
 242         env_t   env_new;
 243         int     rc = 1;
 244         char    *saved_data = NULL;
 245 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 246         ulong   up_data = 0;
 247
 248         up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 249         debug("Data to save 0x%lx\n", up_data);
 250         if (up_data) {
 251                 saved_data = malloc(up_data);
 252                 if (saved_data == NULL) {
 253                         printf("Unable to save the rest of sector (%ld)\n",
 254                                 up_data);
 255                         goto done;
 256                 }
 257                 memcpy(saved_data,
 258                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 259                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 260                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 261                         up_data,
 262                         (ulong)saved_data);
 263         }
 264 #endif  /* CONFIG_ENV_SECT_SIZE */
 265
 266         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 267
 268         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 269                 goto done;
 270
 271         rc = env_export(&env_new);
 272         if (rc)
 273                 goto done;
 274
 275         puts("Erasing Flash...");
 276         if (flash_sect_erase((long)flash_addr, end_addr))
 277                 goto done;
 278
 279         puts("Writing to Flash... ");
 280         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 281         if (rc != 0)
 282                 goto perror;
 283
 284 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 285         if (up_data) {  /* restore the rest of sector */
 286                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 287                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 288                 if (flash_write(saved_data,
 289                                 (long)flash_addr + CONFIG_ENV_SIZE,
 290                                 up_data))
 291                         goto perror;
 292         }
 293 #endif
 294         puts("done\n");
 295         rc = 0;
 296         goto done;
 297 perror:
 298         flash_perror(rc);
 299 done:
 300         if (saved_data)
 301                 free(saved_data);
 302         /* try to re-protect */
 303         flash_sect_protect(1, (long)flash_addr, end_addr);
 304         return rc;
 305 }
 306 #endif /* CMD_SAVEENV */
 307
 308 #endif /* CONFIG_ENV_ADDR_REDUND */
 309
 310 #ifdef LOADENV
 311 static int env_flash_load(void)
 312 {
 313 #ifdef CONFIG_ENV_ADDR_REDUND
 314         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 315                 env_t *etmp = flash_addr;
 316                 ulong ltmp = end_addr;
 317
 318                 flash_addr = flash_addr_new;
 319                 flash_addr_new = etmp;
 320
 321                 end_addr = end_addr_new;
 322                 end_addr_new = ltmp;
 323         }
 324
 325         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 326             crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 327                 char flag = OBSOLETE_FLAG;
 328
 329                 gd->env_valid = ENV_REDUND;
 330                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 331                 flash_write(&flag,
 332                             (ulong)&(flash_addr_new->flags),
 333                             sizeof(flash_addr_new->flags));
 334                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 335         }
 336
 337         if (flash_addr->flags != ACTIVE_FLAG &&
 338             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 339                 char flag = ACTIVE_FLAG;
 340
 341                 gd->env_valid = ENV_REDUND;
 342                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 343                 flash_write(&flag,
 344                             (ulong)&(flash_addr->flags),
 345                             sizeof(flash_addr->flags));
 346                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 347         }
 348
 349         if (gd->env_valid == ENV_REDUND)
 350                 puts("*** Warning - some problems detected "
 351                      "reading environment; recovered successfully\n\n");
 352 #endif /* CONFIG_ENV_ADDR_REDUND */
 353
 354         return env_import((char *)flash_addr, 1);
 355 }
 356 #endif /* LOADENV */
 357
 358 U_BOOT_ENV_LOCATION(flash) = {
 359         .location       = ENVL_FLASH,
 360         ENV_NAME("Flash")
 361 #ifdef LOADENV
 362         .load           = env_flash_load,
 363 #endif
 364 #ifdef CMD_SAVEENV
 365         .save           = env_save_ptr(env_flash_save),
 366 #endif
 367 #ifdef INITENV
 368         .init           = env_flash_init,
 369 #endif
 370 };