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