common/env_mmc.c

   1 /*
   2  * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 /* #define DEBUG */
   8
   9 #include <common.h>
  10
  11 #include <command.h>
  12 #include <environment.h>
  13 #include <linux/stddef.h>
  14 #include <malloc.h>
  15 #include <mmc.h>
  16 #include <search.h>
  17 #include <errno.h>
  18
  19 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  20         (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  21 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  22 #endif
  23
  24 char *env_name_spec = "MMC";
  25
  26 #ifdef ENV_IS_EMBEDDED
  27 env_t *env_ptr = &environment;
  28 #else /* ! ENV_IS_EMBEDDED */
  29 env_t *env_ptr;
  30 #endif /* ENV_IS_EMBEDDED */
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 #if !defined(CONFIG_ENV_OFFSET)
  35 #define CONFIG_ENV_OFFSET 0
  36 #endif
  37
  38 __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  39 {
  40         s64 offset;
  41
  42         offset = CONFIG_ENV_OFFSET;
  43 #ifdef CONFIG_ENV_OFFSET_REDUND
  44         if (copy)
  45                 offset = CONFIG_ENV_OFFSET_REDUND;
  46 #endif
  47
  48         if (offset < 0)
  49                 offset += mmc->capacity;
  50
  51         *env_addr = offset;
  52
  53         return 0;
  54 }
  55
  56 int env_init(void)
  57 {
  58         /* use default */
  59         gd->env_addr    = (ulong)&default_environment[0];
  60         gd->env_valid   = 1;
  61
  62         return 0;
  63 }
  64
  65 #ifdef CONFIG_SYS_MMC_ENV_PART
  66 __weak uint mmc_get_env_part(struct mmc *mmc)
  67 {
  68         return CONFIG_SYS_MMC_ENV_PART;
  69 }
  70
  71 static int mmc_set_env_part(struct mmc *mmc)
  72 {
  73         uint part = mmc_get_env_part(mmc);
  74         int dev = CONFIG_SYS_MMC_ENV_DEV;
  75         int ret = 0;
  76
  77 #ifdef CONFIG_SPL_BUILD
  78         dev = 0;
  79 #endif
  80
  81         if (part != mmc->part_num) {
  82                 ret = mmc_switch_part(dev, part);
  83                 if (ret)
  84                         puts("MMC partition switch failed\n");
  85         }
  86
  87         return ret;
  88 }
  89 #else
  90 static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  91 #endif
  92
  93 static int init_mmc_for_env(struct mmc *mmc)
  94 {
  95         if (!mmc) {
  96                 puts("No MMC card found\n");
  97                 return -1;
  98         }
  99
 100         if (mmc_init(mmc)) {
 101                 puts("MMC init failed\n");
 102                 return -1;
 103         }
 104
 105         return mmc_set_env_part(mmc);
 106 }
 107
 108 static void fini_mmc_for_env(struct mmc *mmc)
 109 {
 110 #ifdef CONFIG_SYS_MMC_ENV_PART
 111         int dev = CONFIG_SYS_MMC_ENV_DEV;
 112
 113 #ifdef CONFIG_SPL_BUILD
 114         dev = 0;
 115 #endif
 116         if (mmc_get_env_part(mmc) != mmc->part_num)
 117                 mmc_switch_part(dev, mmc->part_num);
 118 #endif
 119 }
 120
 121 #ifdef CONFIG_CMD_SAVEENV
 122 static inline int write_env(struct mmc *mmc, unsigned long size,
 123                             unsigned long offset, const void *buffer)
 124 {
 125         uint blk_start, blk_cnt, n;
 126
 127         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 128         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 129
 130         n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 131                                         blk_cnt, (u_char *)buffer);
 132
 133         return (n == blk_cnt) ? 0 : -1;
 134 }
 135
 136 #ifdef CONFIG_ENV_OFFSET_REDUND
 137 static unsigned char env_flags;
 138 #endif
 139
 140 int saveenv(void)
 141 {
 142         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 143         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 144         u32     offset;
 145         int     ret, copy = 0;
 146
 147         if (init_mmc_for_env(mmc))
 148                 return 1;
 149
 150         ret = env_export(env_new);
 151         if (ret)
 152                 goto fini;
 153
 154 #ifdef CONFIG_ENV_OFFSET_REDUND
 155         env_new->flags  = ++env_flags; /* increase the serial */
 156
 157         if (gd->env_valid == 1)
 158                 copy = 1;
 159 #endif
 160
 161         if (mmc_get_env_addr(mmc, copy, &offset)) {
 162                 ret = 1;
 163                 goto fini;
 164         }
 165
 166         printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
 167                CONFIG_SYS_MMC_ENV_DEV);
 168         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 169                 puts("failed\n");
 170                 ret = 1;
 171                 goto fini;
 172         }
 173
 174         puts("done\n");
 175         ret = 0;
 176
 177 #ifdef CONFIG_ENV_OFFSET_REDUND
 178         gd->env_valid = gd->env_valid == 2 ? 1 : 2;
 179 #endif
 180
 181 fini:
 182         fini_mmc_for_env(mmc);
 183         return ret;
 184 }
 185 #endif /* CONFIG_CMD_SAVEENV */
 186
 187 static inline int read_env(struct mmc *mmc, unsigned long size,
 188                            unsigned long offset, const void *buffer)
 189 {
 190         uint blk_start, blk_cnt, n;
 191         int dev = CONFIG_SYS_MMC_ENV_DEV;
 192
 193 #ifdef CONFIG_SPL_BUILD
 194         dev = 0;
 195 #endif
 196
 197         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 198         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 199
 200         n = mmc->block_dev.block_read(dev, blk_start, blk_cnt, (uchar *)buffer);
 201
 202         return (n == blk_cnt) ? 0 : -1;
 203 }
 204
 205 #ifdef CONFIG_ENV_OFFSET_REDUND
 206 void env_relocate_spec(void)
 207 {
 208 #if !defined(ENV_IS_EMBEDDED)
 209         struct mmc *mmc;
 210         u32 offset1, offset2;
 211         int read1_fail = 0, read2_fail = 0;
 212         int crc1_ok = 0, crc2_ok = 0;
 213         env_t *ep;
 214         int ret;
 215         int dev = CONFIG_SYS_MMC_ENV_DEV;
 216
 217         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
 218         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
 219
 220 #ifdef CONFIG_SPL_BUILD
 221         dev = 0;
 222 #endif
 223
 224         mmc = find_mmc_device(dev);
 225
 226         if (init_mmc_for_env(mmc)) {
 227                 ret = 1;
 228                 goto err;
 229         }
 230
 231         if (mmc_get_env_addr(mmc, 0, &offset1) ||
 232             mmc_get_env_addr(mmc, 1, &offset2)) {
 233                 ret = 1;
 234                 goto fini;
 235         }
 236
 237         read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
 238         read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
 239
 240         if (read1_fail && read2_fail)
 241                 puts("*** Error - No Valid Environment Area found\n");
 242         else if (read1_fail || read2_fail)
 243                 puts("*** Warning - some problems detected "
 244                      "reading environment; recovered successfully\n");
 245
 246         crc1_ok = !read1_fail &&
 247                 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 248         crc2_ok = !read2_fail &&
 249                 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 250
 251         if (!crc1_ok && !crc2_ok) {
 252                 ret = 1;
 253                 goto fini;
 254         } else if (crc1_ok && !crc2_ok) {
 255                 gd->env_valid = 1;
 256         } else if (!crc1_ok && crc2_ok) {
 257                 gd->env_valid = 2;
 258         } else {
 259                 /* both ok - check serial */
 260                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 261                         gd->env_valid = 2;
 262                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 263                         gd->env_valid = 1;
 264                 else if (tmp_env1->flags > tmp_env2->flags)
 265                         gd->env_valid = 1;
 266                 else if (tmp_env2->flags > tmp_env1->flags)
 267                         gd->env_valid = 2;
 268                 else /* flags are equal - almost impossible */
 269                         gd->env_valid = 1;
 270         }
 271
 272         free(env_ptr);
 273
 274         if (gd->env_valid == 1)
 275                 ep = tmp_env1;
 276         else
 277                 ep = tmp_env2;
 278
 279         env_flags = ep->flags;
 280         env_import((char *)ep, 0);
 281         ret = 0;
 282
 283 fini:
 284         fini_mmc_for_env(mmc);
 285 err:
 286         if (ret)
 287                 set_default_env(NULL);
 288
 289 #endif
 290 }
 291 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 292 void env_relocate_spec(void)
 293 {
 294 #if !defined(ENV_IS_EMBEDDED)
 295         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 296         struct mmc *mmc;
 297         u32 offset;
 298         int ret;
 299         int dev = CONFIG_SYS_MMC_ENV_DEV;
 300
 301 #ifdef CONFIG_SPL_BUILD
 302         dev = 0;
 303 #endif
 304
 305         mmc = find_mmc_device(dev);
 306
 307         if (init_mmc_for_env(mmc)) {
 308                 ret = 1;
 309                 goto err;
 310         }
 311
 312         if (mmc_get_env_addr(mmc, 0, &offset)) {
 313                 ret = 1;
 314                 goto fini;
 315         }
 316
 317         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 318                 ret = 1;
 319                 goto fini;
 320         }
 321
 322         env_import(buf, 1);
 323         ret = 0;
 324
 325 fini:
 326         fini_mmc_for_env(mmc);
 327 err:
 328         if (ret)
 329                 set_default_env(NULL);
 330 #endif
 331 }
 332 #endif /* CONFIG_ENV_OFFSET_REDUND */