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 char *env_name_spec = "Flash";
  49
  50 #ifdef ENV_IS_EMBEDDED
  51 env_t *env_ptr = &environment;
  52
  53 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  54
  55 #else /* ! ENV_IS_EMBEDDED */
  56
  57 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  58 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  59 #endif /* ENV_IS_EMBEDDED */
  60
  61 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  62 static ulong __maybe_unused end_addr =
  63                 CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  64
  65 #ifdef CONFIG_ENV_ADDR_REDUND
  66
  67 static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  68
  69 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  70 static ulong __maybe_unused end_addr_new =
  71                 CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  72 #endif /* CONFIG_ENV_ADDR_REDUND */
  73
  74 #ifdef CONFIG_ENV_ADDR_REDUND
  75 #ifdef INITENV
  76 static int env_flash_init(void)
  77 {
  78         int crc1_ok = 0, crc2_ok = 0;
  79
  80         uchar flag1 = flash_addr->flags;
  81         uchar flag2 = flash_addr_new->flags;
  82
  83         ulong addr_default = (ulong)&default_environment[0];
  84         ulong addr1 = (ulong)&(flash_addr->data);
  85         ulong addr2 = (ulong)&(flash_addr_new->data);
  86
  87         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  88         crc2_ok =
  89                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  90
  91         if (crc1_ok && !crc2_ok) {
  92                 gd->env_addr    = addr1;
  93                 gd->env_valid   = ENV_VALID;
  94         } else if (!crc1_ok && crc2_ok) {
  95                 gd->env_addr    = addr2;
  96                 gd->env_valid   = ENV_VALID;
  97         } else if (!crc1_ok && !crc2_ok) {
  98                 gd->env_addr    = addr_default;
  99                 gd->env_valid   = 0;
 100         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 101                 gd->env_addr    = addr1;
 102                 gd->env_valid   = ENV_VALID;
 103         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 104                 gd->env_addr    = addr2;
 105                 gd->env_valid   = ENV_VALID;
 106         } else if (flag1 == flag2) {
 107                 gd->env_addr    = addr1;
 108                 gd->env_valid   = ENV_REDUND;
 109         } else if (flag1 == 0xFF) {
 110                 gd->env_addr    = addr1;
 111                 gd->env_valid   = ENV_REDUND;
 112         } else if (flag2 == 0xFF) {
 113                 gd->env_addr    = addr2;
 114                 gd->env_valid   = ENV_REDUND;
 115         }
 116
 117         return 0;
 118 }
 119 #endif
 120
 121 #ifdef CMD_SAVEENV
 122 static int env_flash_save(void)
 123 {
 124         env_t   env_new;
 125         char    *saved_data = NULL;
 126         char    flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 127         int     rc = 1;
 128 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 129         ulong   up_data = 0;
 130 #endif
 131
 132         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 133
 134         if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 135                 goto done;
 136
 137         debug("Protect off %08lX ... %08lX\n",
 138                 (ulong)flash_addr_new, end_addr_new);
 139
 140         if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 141                 goto done;
 142
 143         rc = env_export(&env_new);
 144         if (rc)
 145                 return rc;
 146         env_new.flags   = new_flag;
 147
 148 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 149         up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 150         debug("Data to save 0x%lX\n", up_data);
 151         if (up_data) {
 152                 saved_data = malloc(up_data);
 153                 if (saved_data == NULL) {
 154                         printf("Unable to save the rest of sector (%ld)\n",
 155                                 up_data);
 156                         goto done;
 157                 }
 158                 memcpy(saved_data,
 159                         (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 160                         up_data);
 161                 debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 162                         (long)flash_addr_new + CONFIG_ENV_SIZE,
 163                         up_data, saved_data);
 164         }
 165 #endif
 166         puts("Erasing Flash...");
 167         debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
 168
 169         if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 170                 goto done;
 171
 172         puts("Writing to Flash... ");
 173         debug(" %08lX ... %08lX ...",
 174                 (ulong)&(flash_addr_new->data),
 175                 sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 176         rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 177                          sizeof(env_new));
 178         if (rc)
 179                 goto perror;
 180
 181         rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 182                          sizeof(flash_addr->flags));
 183         if (rc)
 184                 goto perror;
 185
 186 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 187         if (up_data) { /* restore the rest of sector */
 188                 debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 189                         (long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 190                 if (flash_write(saved_data,
 191                                 (long)flash_addr_new + CONFIG_ENV_SIZE,
 192                                 up_data))
 193                         goto perror;
 194         }
 195 #endif
 196         puts("done\n");
 197
 198         {
 199                 env_t *etmp = flash_addr;
 200                 ulong ltmp = end_addr;
 201
 202                 flash_addr = flash_addr_new;
 203                 flash_addr_new = etmp;
 204
 205                 end_addr = end_addr_new;
 206                 end_addr_new = ltmp;
 207         }
 208
 209         rc = 0;
 210         goto done;
 211 perror:
 212         flash_perror(rc);
 213 done:
 214         if (saved_data)
 215                 free(saved_data);
 216         /* try to re-protect */
 217         flash_sect_protect(1, (ulong)flash_addr, end_addr);
 218         flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 219
 220         return rc;
 221 }
 222 #endif /* CMD_SAVEENV */
 223
 224 #else /* ! CONFIG_ENV_ADDR_REDUND */
 225
 226 #ifdef INITENV
 227 static int env_flash_init(void)
 228 {
 229         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 230                 gd->env_addr    = (ulong)&(env_ptr->data);
 231                 gd->env_valid   = ENV_VALID;
 232                 return 0;
 233         }
 234
 235         gd->env_addr    = (ulong)&default_environment[0];
 236         gd->env_valid   = 0;
 237         return 0;
 238 }
 239 #endif
 240
 241 #ifdef CMD_SAVEENV
 242 static int env_flash_save(void)
 243 {
 244         env_t   env_new;
 245         int     rc = 1;
 246         char    *saved_data = NULL;
 247 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 248         ulong   up_data = 0;
 249
 250         up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 251         debug("Data to save 0x%lx\n", up_data);
 252         if (up_data) {
 253                 saved_data = malloc(up_data);
 254                 if (saved_data == NULL) {
 255                         printf("Unable to save the rest of sector (%ld)\n",
 256                                 up_data);
 257                         goto done;
 258                 }
 259                 memcpy(saved_data,
 260                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 261                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 262                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 263                         up_data,
 264                         (ulong)saved_data);
 265         }
 266 #endif  /* CONFIG_ENV_SECT_SIZE */
 267
 268         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 269
 270         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 271                 goto done;
 272
 273         rc = env_export(&env_new);
 274         if (rc)
 275                 goto done;
 276
 277         puts("Erasing Flash...");
 278         if (flash_sect_erase((long)flash_addr, end_addr))
 279                 goto done;
 280
 281         puts("Writing to Flash... ");
 282         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 283         if (rc != 0)
 284                 goto perror;
 285
 286 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 287         if (up_data) {  /* restore the rest of sector */
 288                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 289                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 290                 if (flash_write(saved_data,
 291                                 (long)flash_addr + CONFIG_ENV_SIZE,
 292                                 up_data))
 293                         goto perror;
 294         }
 295 #endif
 296         puts("done\n");
 297         rc = 0;
 298         goto done;
 299 perror:
 300         flash_perror(rc);
 301 done:
 302         if (saved_data)
 303                 free(saved_data);
 304         /* try to re-protect */
 305         flash_sect_protect(1, (long)flash_addr, end_addr);
 306         return rc;
 307 }
 308 #endif /* CMD_SAVEENV */
 309
 310 #endif /* CONFIG_ENV_ADDR_REDUND */
 311
 312 #ifdef LOADENV
 313 static void env_flash_load(void)
 314 {
 315 #ifdef CONFIG_ENV_ADDR_REDUND
 316         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 317                 env_t *etmp = flash_addr;
 318                 ulong ltmp = end_addr;
 319
 320                 flash_addr = flash_addr_new;
 321                 flash_addr_new = etmp;
 322
 323                 end_addr = end_addr_new;
 324                 end_addr_new = ltmp;
 325         }
 326
 327         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 328             crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 329                 char flag = OBSOLETE_FLAG;
 330
 331                 gd->env_valid = ENV_REDUND;
 332                 flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 333                 flash_write(&flag,
 334                             (ulong)&(flash_addr_new->flags),
 335                             sizeof(flash_addr_new->flags));
 336                 flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 337         }
 338
 339         if (flash_addr->flags != ACTIVE_FLAG &&
 340             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 341                 char flag = ACTIVE_FLAG;
 342
 343                 gd->env_valid = ENV_REDUND;
 344                 flash_sect_protect(0, (ulong)flash_addr, end_addr);
 345                 flash_write(&flag,
 346                             (ulong)&(flash_addr->flags),
 347                             sizeof(flash_addr->flags));
 348                 flash_sect_protect(1, (ulong)flash_addr, end_addr);
 349         }
 350
 351         if (gd->env_valid == ENV_REDUND)
 352                 puts("*** Warning - some problems detected "
 353                      "reading environment; recovered successfully\n\n");
 354 #endif /* CONFIG_ENV_ADDR_REDUND */
 355
 356         env_import((char *)flash_addr, 1);
 357 }
 358 #endif /* LOADENV */
 359
 360 U_BOOT_ENV_LOCATION(flash) = {
 361         .location       = ENVL_FLASH,
 362 #ifdef LOADENV
 363         .load           = env_flash_load,
 364 #endif
 365 #ifdef CMD_SAVEENV
 366         .save           = env_save_ptr(env_flash_save),
 367 #endif
 368 #ifdef INITENV
 369         .init           = env_flash_init,
 370 #endif
 371 };