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