env/flash.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2010
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7  * Andreas Heppel <aheppel@sysgo.de>
   8  */
   9
  10 /* #define DEBUG */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <env.h>
  15 #include <env_internal.h>
  16 #include <flash.h>
  17 #include <log.h>
  18 #include <asm/global_data.h>
  19 #include <linux/stddef.h>
  20 #include <malloc.h>
  21 #include <search.h>
  22 #include <errno.h>
  23 #include <u-boot/crc.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 #ifndef CONFIG_SPL_BUILD
  28 # if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
  29 #  define CMD_SAVEENV
  30 # elif defined(CONFIG_ENV_ADDR_REDUND)
  31 #  error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  32 # endif
  33 #endif
  34
  35 /* TODO(sjg@chromium.org): Figure out all these special cases */
  36 #if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
  37         !defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
  38         !defined(CONFIG_TARGET_EDMINIV2)) || \
  39         !defined(CONFIG_SPL_BUILD)
  40 #define LOADENV
  41 #endif
  42
  43 #if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
  44 #define INITENV
  45 #endif
  46
  47 #if defined(CONFIG_ENV_ADDR_REDUND) && defined(CMD_SAVEENV) || \
  48         !defined(CONFIG_ENV_ADDR_REDUND) && defined(INITENV)
  49 #ifdef ENV_IS_EMBEDDED
  50 static env_t *env_ptr = &embedded_environment;
  51 #else /* ! ENV_IS_EMBEDDED */
  52
  53 static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  54 #endif /* ENV_IS_EMBEDDED */
  55 #endif
  56 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  57
  58 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  59 static ulong __maybe_unused end_addr =
  60                 CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  61
  62 #ifdef CONFIG_ENV_ADDR_REDUND
  63
  64 static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  65
  66 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  67 static ulong __maybe_unused end_addr_new =
  68                 CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  69 #endif /* CONFIG_ENV_ADDR_REDUND */
  70
  71 #ifdef CONFIG_ENV_ADDR_REDUND
  72 #ifdef INITENV
  73 static int env_flash_init(void)
  74 {
  75         int crc1_ok = 0, crc2_ok = 0;
  76
  77         uchar flag1 = flash_addr->flags;
  78         uchar flag2 = flash_addr_new->flags;
  79
  80         ulong addr_default = (ulong)&default_environment[0];
  81         ulong addr1 = (ulong)&(flash_addr->data);
  82         ulong addr2 = (ulong)&(flash_addr_new->data);
  83
  84         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  85         crc2_ok =
  86                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  87
  88         if (crc1_ok && !crc2_ok) {
  89                 gd->env_addr    = addr1;
  90                 gd->env_valid   = ENV_VALID;
  91         } else if (!crc1_ok && crc2_ok) {
  92                 gd->env_addr    = addr2;
  93                 gd->env_valid   = ENV_VALID;
  94         } else if (!crc1_ok && !crc2_ok) {
  95                 gd->env_addr    = addr_default;
  96                 gd->env_valid   = ENV_INVALID;
  97         } else if (flag1 == ENV_REDUND_ACTIVE &&
  98                    flag2 == ENV_REDUND_OBSOLETE) {
  99                 gd->env_addr    = addr1;
 100                 gd->env_valid   = ENV_VALID;
 101         } else if (flag1 == ENV_REDUND_OBSOLETE &&
 102                    flag2 == ENV_REDUND_ACTIVE) {
 103                 gd->env_addr    = addr2;
 104                 gd->env_valid   = ENV_VALID;
 105         } else if (flag1 == flag2) {
 106                 gd->env_addr    = addr1;
 107                 gd->env_valid   = ENV_REDUND;
 108         } else if (flag1 == 0xFF) {
 109                 gd->env_addr    = addr1;
 110                 gd->env_valid   = ENV_REDUND;
 111         } else if (flag2 == 0xFF) {
 112                 gd->env_addr    = addr2;
 113                 gd->env_valid   = ENV_REDUND;
 114         }
 115
 116         return 0;
 117 }
 118 #endif
 119
 120 #ifdef CMD_SAVEENV
 121 static int env_flash_save(void)
 122 {
 123         env_t   env_new;
 124         char    *saved_data = NULL;
 125         char    flag = ENV_REDUND_OBSOLETE, new_flag = ENV_REDUND_ACTIVE;
 126         int     rc = 1;
 127 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 128         ulong   up_data = 0;
 129 #endif
 130
 131         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 132
 133         if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 134                 goto done;
 135
 136         debug("Protect off %08lX ... %08lX\n",
 137                 (ulong)flash_addr_new, end_addr_new);
 138
 139         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 140                 goto done;
 141
 142         rc = env_export(&env_new);
 143         if (rc)
 144                 return rc;
 145         env_new.flags   = new_flag;
 146
 147 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 148         up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 149         debug("Data to save 0x%lX\n", up_data);
 150         if (up_data) {
 151                 saved_data = malloc(up_data);
 152                 if (saved_data == NULL) {
 153                         printf("Unable to save the rest of sector (%ld)\n",
 154                                 up_data);
 155                         goto done;
 156                 }
 157                 memcpy(saved_data,
 158                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 159                         up_data);
 160                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 161                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 162                         up_data, saved_data);
 163         }
 164 #endif
 165         puts("Erasing Flash...");
 166         debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
 167
 168         if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 169                 goto done;
 170
 171         puts("Writing to Flash... ");
 172         debug(" %08lX ... %08lX ...",
 173                 (ulong)&(flash_addr_new->data),
 174                 sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 175         rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 176                          sizeof(env_new));
 177         if (rc)
 178                 goto perror;
 179
 180         rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 181                          sizeof(flash_addr->flags));
 182         if (rc)
 183                 goto perror;
 184
 185 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 186         if (up_data) { /* restore the rest of sector */
 187                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 188                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 189                 if (flash_write(saved_data,
 190                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 191                                 up_data))
 192                         goto perror;
 193         }
 194 #endif
 195         puts("done\n");
 196
 197         {
 198                 env_t *etmp = flash_addr;
 199                 ulong ltmp = end_addr;
 200
 201                 flash_addr = flash_addr_new;
 202                 flash_addr_new = etmp;
 203
 204                 end_addr = end_addr_new;
 205                 end_addr_new = ltmp;
 206         }
 207
 208         rc = 0;
 209         goto done;
 210 perror:
 211         flash_perror(rc);
 212 done:
 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         free(saved_data);
 301         /* try to re-protect */
 302         flash_sect_protect(1, (long)flash_addr, end_addr);
 303         return rc;
 304 }
 305 #endif /* CMD_SAVEENV */
 306
 307 #endif /* CONFIG_ENV_ADDR_REDUND */
 308
 309 #ifdef LOADENV
 310 static int env_flash_load(void)
 311 {
 312 #ifdef CONFIG_ENV_ADDR_REDUND
 313         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 314                 env_t *etmp = flash_addr;
 315                 ulong ltmp = end_addr;
 316
 317                 flash_addr = flash_addr_new;
 318                 flash_addr_new = etmp;
 319
 320                 end_addr = end_addr_new;
 321                 end_addr_new = ltmp;
 322         }
 323
 324         if (flash_addr_new->flags != ENV_REDUND_OBSOLETE &&
 325             crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 326                 char flag = ENV_REDUND_OBSOLETE;
 327
 328                 gd->env_valid = ENV_REDUND;
 329                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 330                 flash_write(&flag,
 331                             (ulong)&(flash_addr_new->flags),
 332                             sizeof(flash_addr_new->flags));
 333                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 334         }
 335
 336         if (flash_addr->flags != ENV_REDUND_ACTIVE &&
 337             (flash_addr->flags & ENV_REDUND_ACTIVE) == ENV_REDUND_ACTIVE) {
 338                 char flag = ENV_REDUND_ACTIVE;
 339
 340                 gd->env_valid = ENV_REDUND;
 341                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 342                 flash_write(&flag,
 343                             (ulong)&(flash_addr->flags),
 344                             sizeof(flash_addr->flags));
 345                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 346         }
 347
 348         if (gd->env_valid == ENV_REDUND)
 349                 puts("*** Warning - some problems detected "
 350                      "reading environment; recovered successfully\n\n");
 351 #endif /* CONFIG_ENV_ADDR_REDUND */
 352
 353         return env_import((char *)flash_addr, 1, H_EXTERNAL);
 354 }
 355 #endif /* LOADENV */
 356
 357 U_BOOT_ENV_LOCATION(flash) = {
 358         .location       = ENVL_FLASH,
 359         ENV_NAME("Flash")
 360 #ifdef LOADENV
 361         .load           = env_flash_load,
 362 #endif
 363 #ifdef CMD_SAVEENV
 364         .save           = env_save_ptr(env_flash_save),
 365 #endif
 366 #ifdef INITENV
 367         .init           = env_flash_init,
 368 #endif
 369 };