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 <linux/stddef.h>
  18 #include <malloc.h>
  19 #include <search.h>
  20 #include <errno.h>
  21 #include <u-boot/crc.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 #ifndef CONFIG_SPL_BUILD
  26 # if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
  27 #  define CMD_SAVEENV
  28 # elif defined(CONFIG_ENV_ADDR_REDUND)
  29 #  error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
  30 # endif
  31 #endif
  32
  33 /* TODO(sjg@chromium.org): Figure out all these special cases */
  34 #if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
  35         !defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
  36         !defined(CONFIG_TARGET_EDMINIV2)) || \
  37         !defined(CONFIG_SPL_BUILD)
  38 #define LOADENV
  39 #endif
  40
  41 #if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
  42 #define INITENV
  43 #endif
  44
  45 #if defined(CONFIG_ENV_ADDR_REDUND) && defined(CMD_SAVEENV) || \
  46         !defined(CONFIG_ENV_ADDR_REDUND) && defined(INITENV)
  47 #ifdef ENV_IS_EMBEDDED
  48 static env_t *env_ptr = &embedded_environment;
  49 #else /* ! ENV_IS_EMBEDDED */
  50
  51 static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  52 #endif /* ENV_IS_EMBEDDED */
  53 #endif
  54 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
  55
  56 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
  57 static ulong __maybe_unused end_addr =
  58                 CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
  59
  60 #ifdef CONFIG_ENV_ADDR_REDUND
  61
  62 static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
  63
  64 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
  65 static ulong __maybe_unused end_addr_new =
  66                 CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
  67 #endif /* CONFIG_ENV_ADDR_REDUND */
  68
  69 #ifdef CONFIG_ENV_ADDR_REDUND
  70 #ifdef INITENV
  71 static int env_flash_init(void)
  72 {
  73         int crc1_ok = 0, crc2_ok = 0;
  74
  75         uchar flag1 = flash_addr->flags;
  76         uchar flag2 = flash_addr_new->flags;
  77
  78         ulong addr_default = (ulong)&default_environment[0];
  79         ulong addr1 = (ulong)&(flash_addr->data);
  80         ulong addr2 = (ulong)&(flash_addr_new->data);
  81
  82         crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
  83         crc2_ok =
  84                 crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
  85
  86         if (crc1_ok && !crc2_ok) {
  87                 gd->env_addr    = addr1;
  88                 gd->env_valid   = ENV_VALID;
  89         } else if (!crc1_ok && crc2_ok) {
  90                 gd->env_addr    = addr2;
  91                 gd->env_valid   = ENV_VALID;
  92         } else if (!crc1_ok && !crc2_ok) {
  93                 gd->env_addr    = addr_default;
  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         if (saved_data)
 212                 free(saved_data);
 213         /* try to re-protect */
 214         flash_sect_protect(1, (ulong)flash_addr, end_addr);
 215         flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 216
 217         return rc;
 218 }
 219 #endif /* CMD_SAVEENV */
 220
 221 #else /* ! CONFIG_ENV_ADDR_REDUND */
 222
 223 #ifdef INITENV
 224 static int env_flash_init(void)
 225 {
 226         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 227                 gd->env_addr    = (ulong)&(env_ptr->data);
 228                 gd->env_valid   = ENV_VALID;
 229                 return 0;
 230         }
 231
 232         gd->env_addr    = (ulong)&default_environment[0];
 233         gd->env_valid   = ENV_INVALID;
 234         return 0;
 235 }
 236 #endif
 237
 238 #ifdef CMD_SAVEENV
 239 static int env_flash_save(void)
 240 {
 241         env_t   env_new;
 242         int     rc = 1;
 243         char    *saved_data = NULL;
 244 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 245         ulong   up_data = 0;
 246
 247         up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 248         debug("Data to save 0x%lx\n", up_data);
 249         if (up_data) {
 250                 saved_data = malloc(up_data);
 251                 if (saved_data == NULL) {
 252                         printf("Unable to save the rest of sector (%ld)\n",
 253                                 up_data);
 254                         goto done;
 255                 }
 256                 memcpy(saved_data,
 257                         (void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 258                 debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 259                         (ulong)flash_addr + CONFIG_ENV_SIZE,
 260                         up_data,
 261                         (ulong)saved_data);
 262         }
 263 #endif  /* CONFIG_ENV_SECT_SIZE */
 264
 265         debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
 266
 267         if (flash_sect_protect(0, (long)flash_addr, end_addr))
 268                 goto done;
 269
 270         rc = env_export(&env_new);
 271         if (rc)
 272                 goto done;
 273
 274         puts("Erasing Flash...");
 275         if (flash_sect_erase((long)flash_addr, end_addr))
 276                 goto done;
 277
 278         puts("Writing to Flash... ");
 279         rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 280         if (rc != 0)
 281                 goto perror;
 282
 283 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 284         if (up_data) {  /* restore the rest of sector */
 285                 debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 286                         (ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 287                 if (flash_write(saved_data,
 288                                 (long)flash_addr + CONFIG_ENV_SIZE,
 289                                 up_data))
 290                         goto perror;
 291         }
 292 #endif
 293         puts("done\n");
 294         rc = 0;
 295         goto done;
 296 perror:
 297         flash_perror(rc);
 298 done:
 299         if (saved_data)
 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);
 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 };