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 static int init_mmc_for_env(struct mmc *mmc)
  66 {
  67 #ifdef CONFIG_SYS_MMC_ENV_PART
  68         int dev = CONFIG_SYS_MMC_ENV_DEV;
  69
  70 #ifdef CONFIG_SPL_BUILD
  71         dev = 0;
  72 #endif
  73 #endif
  74
  75         if (!mmc) {
  76                 puts("No MMC card found\n");
  77                 return -1;
  78         }
  79
  80         if (mmc_init(mmc)) {
  81                 puts("MMC init failed\n");
  82                 return -1;
  83         }
  84
  85 #ifdef CONFIG_SYS_MMC_ENV_PART
  86         if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
  87                 if (mmc_switch_part(dev, CONFIG_SYS_MMC_ENV_PART)) {
  88                         puts("MMC partition switch failed\n");
  89                         return -1;
  90                 }
  91         }
  92 #endif
  93
  94         return 0;
  95 }
  96
  97 static void fini_mmc_for_env(struct mmc *mmc)
  98 {
  99 #ifdef CONFIG_SYS_MMC_ENV_PART
 100         int dev = CONFIG_SYS_MMC_ENV_DEV;
 101
 102 #ifdef CONFIG_SPL_BUILD
 103         dev = 0;
 104 #endif
 105         if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
 106                 mmc_switch_part(dev, mmc->part_num);
 107 #endif
 108 }
 109
 110 #ifdef CONFIG_CMD_SAVEENV
 111 static inline int write_env(struct mmc *mmc, unsigned long size,
 112                             unsigned long offset, const void *buffer)
 113 {
 114         uint blk_start, blk_cnt, n;
 115
 116         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 117         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 118
 119         n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 120                                         blk_cnt, (u_char *)buffer);
 121
 122         return (n == blk_cnt) ? 0 : -1;
 123 }
 124
 125 #ifdef CONFIG_ENV_OFFSET_REDUND
 126 static unsigned char env_flags;
 127 #endif
 128
 129 int saveenv(void)
 130 {
 131         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 132         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 133         u32     offset;
 134         int     ret, copy = 0;
 135
 136         if (init_mmc_for_env(mmc))
 137                 return 1;
 138
 139         ret = env_export(env_new);
 140         if (ret)
 141                 goto fini;
 142
 143 #ifdef CONFIG_ENV_OFFSET_REDUND
 144         env_new->flags  = ++env_flags; /* increase the serial */
 145
 146         if (gd->env_valid == 1)
 147                 copy = 1;
 148 #endif
 149
 150         if (mmc_get_env_addr(mmc, copy, &offset)) {
 151                 ret = 1;
 152                 goto fini;
 153         }
 154
 155         printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
 156                CONFIG_SYS_MMC_ENV_DEV);
 157         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 158                 puts("failed\n");
 159                 ret = 1;
 160                 goto fini;
 161         }
 162
 163         puts("done\n");
 164         ret = 0;
 165
 166 #ifdef CONFIG_ENV_OFFSET_REDUND
 167         gd->env_valid = gd->env_valid == 2 ? 1 : 2;
 168 #endif
 169
 170 fini:
 171         fini_mmc_for_env(mmc);
 172         return ret;
 173 }
 174 #endif /* CONFIG_CMD_SAVEENV */
 175
 176 static inline int read_env(struct mmc *mmc, unsigned long size,
 177                            unsigned long offset, const void *buffer)
 178 {
 179         uint blk_start, blk_cnt, n;
 180         int dev = CONFIG_SYS_MMC_ENV_DEV;
 181
 182 #ifdef CONFIG_SPL_BUILD
 183         dev = 0;
 184 #endif
 185
 186         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 187         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 188
 189         n = mmc->block_dev.block_read(dev, blk_start, blk_cnt, (uchar *)buffer);
 190
 191         return (n == blk_cnt) ? 0 : -1;
 192 }
 193
 194 #ifdef CONFIG_ENV_OFFSET_REDUND
 195 void env_relocate_spec(void)
 196 {
 197 #if !defined(ENV_IS_EMBEDDED)
 198         struct mmc *mmc;
 199         u32 offset1, offset2;
 200         int read1_fail = 0, read2_fail = 0;
 201         int crc1_ok = 0, crc2_ok = 0;
 202         env_t *ep;
 203         int ret;
 204         int dev = CONFIG_SYS_MMC_ENV_DEV;
 205
 206         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
 207         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
 208
 209 #ifdef CONFIG_SPL_BUILD
 210         dev = 0;
 211 #endif
 212
 213         mmc = find_mmc_device(dev);
 214
 215         if (init_mmc_for_env(mmc)) {
 216                 ret = 1;
 217                 goto err;
 218         }
 219
 220         if (mmc_get_env_addr(mmc, 0, &offset1) ||
 221             mmc_get_env_addr(mmc, 1, &offset2)) {
 222                 ret = 1;
 223                 goto fini;
 224         }
 225
 226         read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
 227         read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
 228
 229         if (read1_fail && read2_fail)
 230                 puts("*** Error - No Valid Environment Area found\n");
 231         else if (read1_fail || read2_fail)
 232                 puts("*** Warning - some problems detected "
 233                      "reading environment; recovered successfully\n");
 234
 235         crc1_ok = !read1_fail &&
 236                 (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
 237         crc2_ok = !read2_fail &&
 238                 (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 239
 240         if (!crc1_ok && !crc2_ok) {
 241                 ret = 1;
 242                 goto fini;
 243         } else if (crc1_ok && !crc2_ok) {
 244                 gd->env_valid = 1;
 245         } else if (!crc1_ok && crc2_ok) {
 246                 gd->env_valid = 2;
 247         } else {
 248                 /* both ok - check serial */
 249                 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 250                         gd->env_valid = 2;
 251                 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 252                         gd->env_valid = 1;
 253                 else if (tmp_env1->flags > tmp_env2->flags)
 254                         gd->env_valid = 1;
 255                 else if (tmp_env2->flags > tmp_env1->flags)
 256                         gd->env_valid = 2;
 257                 else /* flags are equal - almost impossible */
 258                         gd->env_valid = 1;
 259         }
 260
 261         free(env_ptr);
 262
 263         if (gd->env_valid == 1)
 264                 ep = tmp_env1;
 265         else
 266                 ep = tmp_env2;
 267
 268         env_flags = ep->flags;
 269         env_import((char *)ep, 0);
 270         ret = 0;
 271
 272 fini:
 273         fini_mmc_for_env(mmc);
 274 err:
 275         if (ret)
 276                 set_default_env(NULL);
 277
 278 #endif
 279 }
 280 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 281 void env_relocate_spec(void)
 282 {
 283 #if !defined(ENV_IS_EMBEDDED)
 284         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 285         struct mmc *mmc;
 286         u32 offset;
 287         int ret;
 288         int dev = CONFIG_SYS_MMC_ENV_DEV;
 289
 290 #ifdef CONFIG_SPL_BUILD
 291         dev = 0;
 292 #endif
 293
 294         mmc = find_mmc_device(dev);
 295
 296         if (init_mmc_for_env(mmc)) {
 297                 ret = 1;
 298                 goto err;
 299         }
 300
 301         if (mmc_get_env_addr(mmc, 0, &offset)) {
 302                 ret = 1;
 303                 goto fini;
 304         }
 305
 306         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 307                 ret = 1;
 308                 goto fini;
 309         }
 310
 311         env_import(buf, 1);
 312         ret = 0;
 313
 314 fini:
 315         fini_mmc_for_env(mmc);
 316 err:
 317         if (ret)
 318                 set_default_env(NULL);
 319 #endif
 320 }
 321 #endif /* CONFIG_ENV_OFFSET_REDUND */