common/env_nand.c

   1 /*
   2  * (C) Copyright 2000-2010
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2008
   6  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
   7  *
   8  * (C) Copyright 2004
   9  * Jian Zhang, Texas Instruments, jzhang@ti.com.
  10  *
  11  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Andreas Heppel <aheppel@sysgo.de>
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include <common.h>
  18 #include <command.h>
  19 #include <environment.h>
  20 #include <linux/stddef.h>
  21 #include <malloc.h>
  22 #include <nand.h>
  23 #include <search.h>
  24 #include <errno.h>
  25
  26 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
  27 #define CMD_SAVEENV
  28 #elif defined(CONFIG_ENV_OFFSET_REDUND)
  29 #error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
  30 #endif
  31
  32 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  33         (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  34 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  35 #endif
  36
  37 #ifndef CONFIG_ENV_RANGE
  38 #define CONFIG_ENV_RANGE        CONFIG_ENV_SIZE
  39 #endif
  40
  41 char *env_name_spec = "NAND";
  42
  43 #if defined(ENV_IS_EMBEDDED)
  44 env_t *env_ptr = &environment;
  45 #elif defined(CONFIG_NAND_ENV_DST)
  46 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
  47 #else /* ! ENV_IS_EMBEDDED */
  48 env_t *env_ptr;
  49 #endif /* ENV_IS_EMBEDDED */
  50
  51 DECLARE_GLOBAL_DATA_PTR;
  52
  53 /*
  54  * This is called before nand_init() so we can't read NAND to
  55  * validate env data.
  56  *
  57  * Mark it OK for now. env_relocate() in env_common.c will call our
  58  * relocate function which does the real validation.
  59  *
  60  * When using a NAND boot image (like sequoia_nand), the environment
  61  * can be embedded or attached to the U-Boot image in NAND flash.
  62  * This way the SPL loads not only the U-Boot image from NAND but
  63  * also the environment.
  64  */
  65 int env_init(void)
  66 {
  67 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
  68         int crc1_ok = 0, crc2_ok = 0;
  69         env_t *tmp_env1;
  70
  71 #ifdef CONFIG_ENV_OFFSET_REDUND
  72         env_t *tmp_env2;
  73
  74         tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
  75         crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
  76 #endif
  77         tmp_env1 = env_ptr;
  78         crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
  79
  80         if (!crc1_ok && !crc2_ok) {
  81                 gd->env_addr    = 0;
  82                 gd->env_valid   = 0;
  83
  84                 return 0;
  85         } else if (crc1_ok && !crc2_ok) {
  86                 gd->env_valid = 1;
  87         }
  88 #ifdef CONFIG_ENV_OFFSET_REDUND
  89         else if (!crc1_ok && crc2_ok) {
  90                 gd->env_valid = 2;
  91         } else {
  92                 /* both ok - check serial */
  93                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
  94                         gd->env_valid = 2;
  95                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
  96                         gd->env_valid = 1;
  97                 else if (tmp_env1->flags > tmp_env2->flags)
  98                         gd->env_valid = 1;
  99                 else if (tmp_env2->flags > tmp_env1->flags)
 100                         gd->env_valid = 2;
 101                 else /* flags are equal - almost impossible */
 102                         gd->env_valid = 1;
 103         }
 104
 105         if (gd->env_valid == 2)
 106                 env_ptr = tmp_env2;
 107         else
 108 #endif
 109         if (gd->env_valid == 1)
 110                 env_ptr = tmp_env1;
 111
 112         gd->env_addr = (ulong)env_ptr->data;
 113
 114 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 115         gd->env_addr    = (ulong)&default_environment[0];
 116         gd->env_valid   = 1;
 117 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 118
 119         return 0;
 120 }
 121
 122 #ifdef CMD_SAVEENV
 123 /*
 124  * The legacy NAND code saved the environment in the first NAND device i.e.,
 125  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 126  */
 127 static int writeenv(size_t offset, u_char *buf)
 128 {
 129         size_t end = offset + CONFIG_ENV_RANGE;
 130         size_t amount_saved = 0;
 131         size_t blocksize, len;
 132         u_char *char_ptr;
 133
 134         blocksize = nand_info[0].erasesize;
 135         len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
 136
 137         while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
 138                 if (nand_block_isbad(&nand_info[0], offset)) {
 139                         offset += blocksize;
 140                 } else {
 141                         char_ptr = &buf[amount_saved];
 142                         if (nand_write(&nand_info[0], offset, &len, char_ptr))
 143                                 return 1;
 144
 145                         offset += blocksize;
 146                         amount_saved += len;
 147                 }
 148         }
 149         if (amount_saved != CONFIG_ENV_SIZE)
 150                 return 1;
 151
 152         return 0;
 153 }
 154
 155 struct env_location {
 156         const char *name;
 157         const nand_erase_options_t erase_opts;
 158 };
 159
 160 static int erase_and_write_env(const struct env_location *location,
 161                 u_char *env_new)
 162 {
 163         int ret = 0;
 164
 165         printf("Erasing %s...\n", location->name);
 166         if (nand_erase_opts(&nand_info[0], &location->erase_opts))
 167                 return 1;
 168
 169         printf("Writing to %s... ", location->name);
 170         ret = writeenv(location->erase_opts.offset, env_new);
 171         puts(ret ? "FAILED!\n" : "OK\n");
 172
 173         return ret;
 174 }
 175
 176 #ifdef CONFIG_ENV_OFFSET_REDUND
 177 static unsigned char env_flags;
 178 #endif
 179
 180 int saveenv(void)
 181 {
 182         int     ret = 0;
 183         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 184         int     env_idx = 0;
 185         static const struct env_location location[] = {
 186                 {
 187                         .name = "NAND",
 188                         .erase_opts = {
 189                                 .length = CONFIG_ENV_RANGE,
 190                                 .offset = CONFIG_ENV_OFFSET,
 191                         },
 192                 },
 193 #ifdef CONFIG_ENV_OFFSET_REDUND
 194                 {
 195                         .name = "redundant NAND",
 196                         .erase_opts = {
 197                                 .length = CONFIG_ENV_RANGE,
 198                                 .offset = CONFIG_ENV_OFFSET_REDUND,
 199                         },
 200                 },
 201 #endif
 202         };
 203
 204
 205         if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 206                 return 1;
 207
 208         ret = env_export(env_new);
 209         if (ret)
 210                 return ret;
 211
 212 #ifdef CONFIG_ENV_OFFSET_REDUND
 213         env_new->flags = ++env_flags; /* increase the serial */
 214         env_idx = (gd->env_valid == 1);
 215 #endif
 216
 217         ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
 218 #ifdef CONFIG_ENV_OFFSET_REDUND
 219         if (!ret) {
 220                 /* preset other copy for next write */
 221                 gd->env_valid = gd->env_valid == 2 ? 1 : 2;
 222                 return ret;
 223         }
 224
 225         env_idx = (env_idx + 1) & 1;
 226         ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
 227         if (!ret)
 228                 printf("Warning: primary env write failed,"
 229                                 " redundancy is lost!\n");
 230 #endif
 231
 232         return ret;
 233 }
 234 #endif /* CMD_SAVEENV */
 235
 236 static int readenv(size_t offset, u_char *buf)
 237 {
 238         size_t end = offset + CONFIG_ENV_RANGE;
 239         size_t amount_loaded = 0;
 240         size_t blocksize, len;
 241         u_char *char_ptr;
 242
 243         blocksize = nand_info[0].erasesize;
 244         if (!blocksize)
 245                 return 1;
 246
 247         len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
 248
 249         while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
 250                 if (nand_block_isbad(&nand_info[0], offset)) {
 251                         offset += blocksize;
 252                 } else {
 253                         char_ptr = &buf[amount_loaded];
 254                         if (nand_read_skip_bad(&nand_info[0], offset,
 255                                                &len, NULL,
 256                                                nand_info[0].size, char_ptr))
 257                                 return 1;
 258
 259                         offset += blocksize;
 260                         amount_loaded += len;
 261                 }
 262         }
 263
 264         if (amount_loaded != CONFIG_ENV_SIZE)
 265                 return 1;
 266
 267         return 0;
 268 }
 269
 270 #ifdef CONFIG_ENV_OFFSET_OOB
 271 int get_nand_env_oob(nand_info_t *nand, unsigned long *result)
 272 {
 273         struct mtd_oob_ops ops;
 274         uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
 275         int ret;
 276
 277         ops.datbuf      = NULL;
 278         ops.mode        = MTD_OOB_AUTO;
 279         ops.ooboffs     = 0;
 280         ops.ooblen      = ENV_OFFSET_SIZE;
 281         ops.oobbuf      = (void *)oob_buf;
 282
 283         ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
 284         if (ret) {
 285                 printf("error reading OOB block 0\n");
 286                 return ret;
 287         }
 288
 289         if (oob_buf[0] == ENV_OOB_MARKER) {
 290                 *result = oob_buf[1] * nand->erasesize;
 291         } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
 292                 *result = oob_buf[1];
 293         } else {
 294                 printf("No dynamic environment marker in OOB block 0\n");
 295                 return -ENOENT;
 296         }
 297
 298         return 0;
 299 }
 300 #endif
 301
 302 #ifdef CONFIG_ENV_OFFSET_REDUND
 303 void env_relocate_spec(void)
 304 {
 305 #if !defined(ENV_IS_EMBEDDED)
 306         int read1_fail = 0, read2_fail = 0;
 307         int crc1_ok = 0, crc2_ok = 0;
 308         env_t *ep, *tmp_env1, *tmp_env2;
 309
 310         tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
 311         tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
 312         if (tmp_env1 == NULL || tmp_env2 == NULL) {
 313                 puts("Can't allocate buffers for environment\n");
 314                 set_default_env("!malloc() failed");
 315                 goto done;
 316         }
 317
 318         read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
 319         read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
 320
 321         if (read1_fail && read2_fail)
 322                 puts("*** Error - No Valid Environment Area found\n");
 323         else if (read1_fail || read2_fail)
 324                 puts("*** Warning - some problems detected "
 325                      "reading environment; recovered successfully\n");
 326
 327         crc1_ok = !read1_fail &&
 328                 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 329         crc2_ok = !read2_fail &&
 330                 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 331
 332         if (!crc1_ok && !crc2_ok) {
 333                 set_default_env("!bad CRC");
 334                 goto done;
 335         } else if (crc1_ok && !crc2_ok) {
 336                 gd->env_valid = 1;
 337         } else if (!crc1_ok && crc2_ok) {
 338                 gd->env_valid = 2;
 339         } else {
 340                 /* both ok - check serial */
 341                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 342                         gd->env_valid = 2;
 343                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 344                         gd->env_valid = 1;
 345                 else if (tmp_env1->flags > tmp_env2->flags)
 346                         gd->env_valid = 1;
 347                 else if (tmp_env2->flags > tmp_env1->flags)
 348                         gd->env_valid = 2;
 349                 else /* flags are equal - almost impossible */
 350                         gd->env_valid = 1;
 351         }
 352
 353         free(env_ptr);
 354
 355         if (gd->env_valid == 1)
 356                 ep = tmp_env1;
 357         else
 358                 ep = tmp_env2;
 359
 360         env_flags = ep->flags;
 361         env_import((char *)ep, 0);
 362
 363 done:
 364         free(tmp_env1);
 365         free(tmp_env2);
 366
 367 #endif /* ! ENV_IS_EMBEDDED */
 368 }
 369 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 370 /*
 371  * The legacy NAND code saved the environment in the first NAND
 372  * device i.e., nand_dev_desc + 0. This is also the behaviour using
 373  * the new NAND code.
 374  */
 375 void env_relocate_spec(void)
 376 {
 377 #if !defined(ENV_IS_EMBEDDED)
 378         int ret;
 379         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 380
 381 #if defined(CONFIG_ENV_OFFSET_OOB)
 382         ret = get_nand_env_oob(&nand_info[0], &nand_env_oob_offset);
 383         /*
 384          * If unable to read environment offset from NAND OOB then fall through
 385          * to the normal environment reading code below
 386          */
 387         if (!ret) {
 388                 printf("Found Environment offset in OOB..\n");
 389         } else {
 390                 set_default_env("!no env offset in OOB");
 391                 return;
 392         }
 393 #endif
 394
 395         ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
 396         if (ret) {
 397                 set_default_env("!readenv() failed");
 398                 return;
 399         }
 400
 401         env_import(buf, 1);
 402 #endif /* ! ENV_IS_EMBEDDED */
 403 }
 404 #endif /* CONFIG_ENV_OFFSET_REDUND */