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 <memalign.h>
  16 #include <mmc.h>
  17 #include <search.h>
  18 #include <errno.h>
  19
  20 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  21         (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  22 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  23 #endif
  24
  25 char *env_name_spec = "MMC";
  26
  27 #ifdef ENV_IS_EMBEDDED
  28 env_t *env_ptr = &environment;
  29 #else /* ! ENV_IS_EMBEDDED */
  30 env_t *env_ptr;
  31 #endif /* ENV_IS_EMBEDDED */
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #if !defined(CONFIG_ENV_OFFSET)
  36 #define CONFIG_ENV_OFFSET 0
  37 #endif
  38
  39 __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  40 {
  41         s64 offset;
  42
  43         offset = CONFIG_ENV_OFFSET;
  44 #ifdef CONFIG_ENV_OFFSET_REDUND
  45         if (copy)
  46                 offset = CONFIG_ENV_OFFSET_REDUND;
  47 #endif
  48
  49         if (offset < 0)
  50                 offset += mmc->capacity;
  51
  52         *env_addr = offset;
  53
  54         return 0;
  55 }
  56
  57 __weak int mmc_get_env_dev(void)
  58 {
  59         return CONFIG_SYS_MMC_ENV_DEV;
  60 }
  61
  62 int env_init(void)
  63 {
  64         /* use default */
  65         gd->env_addr    = (ulong)&default_environment[0];
  66         gd->env_valid   = 1;
  67
  68         return 0;
  69 }
  70
  71 #ifdef CONFIG_SYS_MMC_ENV_PART
  72 __weak uint mmc_get_env_part(struct mmc *mmc)
  73 {
  74         return CONFIG_SYS_MMC_ENV_PART;
  75 }
  76
  77 static unsigned char env_mmc_orig_hwpart;
  78
  79 static int mmc_set_env_part(struct mmc *mmc)
  80 {
  81         uint part = mmc_get_env_part(mmc);
  82         int dev = mmc_get_env_dev();
  83         int ret = 0;
  84
  85 #ifdef CONFIG_SPL_BUILD
  86         dev = 0;
  87 #endif
  88
  89         env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  90         ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  91         if (ret)
  92                 puts("MMC partition switch failed\n");
  93
  94         return ret;
  95 }
  96 #else
  97 static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  98 #endif
  99
 100 static const char *init_mmc_for_env(struct mmc *mmc)
 101 {
 102         if (!mmc)
 103                 return "!No MMC card found";
 104
 105         if (mmc_init(mmc))
 106                 return "!MMC init failed";
 107
 108         if (mmc_set_env_part(mmc))
 109                 return "!MMC partition switch failed";
 110
 111         return NULL;
 112 }
 113
 114 static void fini_mmc_for_env(struct mmc *mmc)
 115 {
 116 #ifdef CONFIG_SYS_MMC_ENV_PART
 117         int dev = mmc_get_env_dev();
 118
 119 #ifdef CONFIG_SPL_BUILD
 120         dev = 0;
 121 #endif
 122         blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
 123 #endif
 124 }
 125
 126 #ifdef CONFIG_CMD_SAVEENV
 127 static inline int write_env(struct mmc *mmc, unsigned long size,
 128                             unsigned long offset, const void *buffer)
 129 {
 130         uint blk_start, blk_cnt, n;
 131         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 132
 133         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 134         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 135
 136         n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
 137
 138         return (n == blk_cnt) ? 0 : -1;
 139 }
 140
 141 #ifdef CONFIG_ENV_OFFSET_REDUND
 142 static unsigned char env_flags;
 143 #endif
 144
 145 int saveenv(void)
 146 {
 147         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 148         int dev = mmc_get_env_dev();
 149         struct mmc *mmc = find_mmc_device(dev);
 150         u32     offset;
 151         int     ret, copy = 0;
 152         const char *errmsg;
 153
 154         errmsg = init_mmc_for_env(mmc);
 155         if (errmsg) {
 156                 printf("%s\n", errmsg);
 157                 return 1;
 158         }
 159
 160         ret = env_export(env_new);
 161         if (ret)
 162                 goto fini;
 163
 164 #ifdef CONFIG_ENV_OFFSET_REDUND
 165         env_new->flags  = ++env_flags; /* increase the serial */
 166
 167         if (gd->env_valid == 1)
 168                 copy = 1;
 169 #endif
 170
 171         if (mmc_get_env_addr(mmc, copy, &offset)) {
 172                 ret = 1;
 173                 goto fini;
 174         }
 175
 176         printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
 177         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 178                 puts("failed\n");
 179                 ret = 1;
 180                 goto fini;
 181         }
 182
 183         puts("done\n");
 184         ret = 0;
 185
 186 #ifdef CONFIG_ENV_OFFSET_REDUND
 187         gd->env_valid = gd->env_valid == 2 ? 1 : 2;
 188 #endif
 189
 190 fini:
 191         fini_mmc_for_env(mmc);
 192         return ret;
 193 }
 194 #endif /* CONFIG_CMD_SAVEENV */
 195
 196 static inline int read_env(struct mmc *mmc, unsigned long size,
 197                            unsigned long offset, const void *buffer)
 198 {
 199         uint blk_start, blk_cnt, n;
 200         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 201
 202         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 203         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 204
 205         n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
 206
 207         return (n == blk_cnt) ? 0 : -1;
 208 }
 209
 210 #ifdef CONFIG_ENV_OFFSET_REDUND
 211 void env_relocate_spec(void)
 212 {
 213 #if !defined(ENV_IS_EMBEDDED)
 214         struct mmc *mmc;
 215         u32 offset1, offset2;
 216         int read1_fail = 0, read2_fail = 0;
 217         int crc1_ok = 0, crc2_ok = 0;
 218         env_t *ep;
 219         int ret;
 220         int dev = mmc_get_env_dev();
 221         const char *errmsg = NULL;
 222
 223         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
 224         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
 225
 226 #ifdef CONFIG_SPL_BUILD
 227         dev = 0;
 228 #endif
 229
 230         mmc = find_mmc_device(dev);
 231
 232         errmsg = init_mmc_for_env(mmc);
 233         if (errmsg) {
 234                 ret = 1;
 235                 goto err;
 236         }
 237
 238         if (mmc_get_env_addr(mmc, 0, &offset1) ||
 239             mmc_get_env_addr(mmc, 1, &offset2)) {
 240                 ret = 1;
 241                 goto fini;
 242         }
 243
 244         read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
 245         read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
 246
 247         if (read1_fail && read2_fail)
 248                 puts("*** Error - No Valid Environment Area found\n");
 249         else if (read1_fail || read2_fail)
 250                 puts("*** Warning - some problems detected "
 251                      "reading environment; recovered successfully\n");
 252
 253         crc1_ok = !read1_fail &&
 254                 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 255         crc2_ok = !read2_fail &&
 256                 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 257
 258         if (!crc1_ok && !crc2_ok) {
 259                 errmsg = "!bad CRC";
 260                 ret = 1;
 261                 goto fini;
 262         } else if (crc1_ok && !crc2_ok) {
 263                 gd->env_valid = 1;
 264         } else if (!crc1_ok && crc2_ok) {
 265                 gd->env_valid = 2;
 266         } else {
 267                 /* both ok - check serial */
 268                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 269                         gd->env_valid = 2;
 270                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 271                         gd->env_valid = 1;
 272                 else if (tmp_env1->flags > tmp_env2->flags)
 273                         gd->env_valid = 1;
 274                 else if (tmp_env2->flags > tmp_env1->flags)
 275                         gd->env_valid = 2;
 276                 else /* flags are equal - almost impossible */
 277                         gd->env_valid = 1;
 278         }
 279
 280         free(env_ptr);
 281
 282         if (gd->env_valid == 1)
 283                 ep = tmp_env1;
 284         else
 285                 ep = tmp_env2;
 286
 287         env_flags = ep->flags;
 288         env_import((char *)ep, 0);
 289         ret = 0;
 290
 291 fini:
 292         fini_mmc_for_env(mmc);
 293 err:
 294         if (ret)
 295                 set_default_env(errmsg);
 296 #endif
 297 }
 298 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 299 void env_relocate_spec(void)
 300 {
 301 #if !defined(ENV_IS_EMBEDDED)
 302         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 303         struct mmc *mmc;
 304         u32 offset;
 305         int ret;
 306         int dev = mmc_get_env_dev();
 307         const char *errmsg;
 308
 309 #ifdef CONFIG_SPL_BUILD
 310         dev = 0;
 311 #endif
 312
 313         mmc = find_mmc_device(dev);
 314
 315         errmsg = init_mmc_for_env(mmc);
 316         if (errmsg) {
 317                 ret = 1;
 318                 goto err;
 319         }
 320
 321         if (mmc_get_env_addr(mmc, 0, &offset)) {
 322                 ret = 1;
 323                 goto fini;
 324         }
 325
 326         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 327                 errmsg = "!read failed";
 328                 ret = 1;
 329                 goto fini;
 330         }
 331
 332         env_import(buf, 1);
 333         ret = 0;
 334
 335 fini:
 336         fini_mmc_for_env(mmc);
 337 err:
 338         if (ret)
 339                 set_default_env(errmsg);
 340 #endif
 341 }
 342 #endif /* CONFIG_ENV_OFFSET_REDUND */