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 <fdtdec.h>
  14 #include <linux/stddef.h>
  15 #include <malloc.h>
  16 #include <memalign.h>
  17 #include <mmc.h>
  18 #include <search.h>
  19 #include <errno.h>
  20
  21 #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  22         (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  23 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  24 #endif
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 #if !defined(CONFIG_ENV_OFFSET)
  29 #define CONFIG_ENV_OFFSET 0
  30 #endif
  31
  32 #if CONFIG_IS_ENABLED(OF_CONTROL)
  33 static inline s64 mmc_offset(int copy)
  34 {
  35         const char *propname = "u-boot,mmc-env-offset";
  36         s64 defvalue = CONFIG_ENV_OFFSET;
  37
  38 #if defined(CONFIG_ENV_OFFSET_REDUND)
  39         if (copy) {
  40                 propname = "u-boot,mmc-env-offset-redundant";
  41                 defvalue = CONFIG_ENV_OFFSET_REDUND;
  42         }
  43 #endif
  44
  45         return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  46 }
  47 #else
  48 static inline s64 mmc_offset(int copy)
  49 {
  50         s64 offset = CONFIG_ENV_OFFSET;
  51
  52 #if defined(CONFIG_ENV_OFFSET_REDUND)
  53         if (copy)
  54                 offset = CONFIG_ENV_OFFSET_REDUND;
  55 #endif
  56         return offset;
  57 }
  58 #endif
  59
  60 __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  61 {
  62         s64 offset = mmc_offset(copy);
  63
  64         if (offset < 0)
  65                 offset += mmc->capacity;
  66
  67         *env_addr = offset;
  68
  69         return 0;
  70 }
  71
  72 __weak int mmc_get_env_dev(void)
  73 {
  74         return CONFIG_SYS_MMC_ENV_DEV;
  75 }
  76
  77 #ifdef CONFIG_SYS_MMC_ENV_PART
  78 __weak uint mmc_get_env_part(struct mmc *mmc)
  79 {
  80         return CONFIG_SYS_MMC_ENV_PART;
  81 }
  82
  83 static unsigned char env_mmc_orig_hwpart;
  84
  85 static int mmc_set_env_part(struct mmc *mmc)
  86 {
  87         uint part = mmc_get_env_part(mmc);
  88         int dev = mmc_get_env_dev();
  89         int ret = 0;
  90
  91         env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  92         ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  93         if (ret)
  94                 puts("MMC partition switch failed\n");
  95
  96         return ret;
  97 }
  98 #else
  99 static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
 100 #endif
 101
 102 static const char *init_mmc_for_env(struct mmc *mmc)
 103 {
 104         if (!mmc)
 105                 return "!No MMC card found";
 106
 107 #ifdef CONFIG_BLK
 108         struct udevice *dev;
 109
 110         if (blk_get_from_parent(mmc->dev, &dev))
 111                 return "!No block device";
 112 #else
 113         if (mmc_init(mmc))
 114                 return "!MMC init failed";
 115 #endif
 116         if (mmc_set_env_part(mmc))
 117                 return "!MMC partition switch failed";
 118
 119         return NULL;
 120 }
 121
 122 static void fini_mmc_for_env(struct mmc *mmc)
 123 {
 124 #ifdef CONFIG_SYS_MMC_ENV_PART
 125         int dev = mmc_get_env_dev();
 126
 127         blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
 128 #endif
 129 }
 130
 131 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
 132 static inline int write_env(struct mmc *mmc, unsigned long size,
 133                             unsigned long offset, const void *buffer)
 134 {
 135         uint blk_start, blk_cnt, n;
 136         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 137
 138         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 139         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 140
 141         n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
 142
 143         return (n == blk_cnt) ? 0 : -1;
 144 }
 145
 146 static int env_mmc_save(void)
 147 {
 148         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 149         int dev = mmc_get_env_dev();
 150         struct mmc *mmc = find_mmc_device(dev);
 151         u32     offset;
 152         int     ret, copy = 0;
 153         const char *errmsg;
 154
 155         errmsg = init_mmc_for_env(mmc);
 156         if (errmsg) {
 157                 printf("%s\n", errmsg);
 158                 return 1;
 159         }
 160
 161         ret = env_export(env_new);
 162         if (ret)
 163                 goto fini;
 164
 165 #ifdef CONFIG_ENV_OFFSET_REDUND
 166         if (gd->env_valid == ENV_VALID)
 167                 copy = 1;
 168 #endif
 169
 170         if (mmc_get_env_addr(mmc, copy, &offset)) {
 171                 ret = 1;
 172                 goto fini;
 173         }
 174
 175         printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
 176         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 177                 puts("failed\n");
 178                 ret = 1;
 179                 goto fini;
 180         }
 181
 182         puts("done\n");
 183         ret = 0;
 184
 185 #ifdef CONFIG_ENV_OFFSET_REDUND
 186         gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
 187 #endif
 188
 189 fini:
 190         fini_mmc_for_env(mmc);
 191         return ret;
 192 }
 193 #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
 194
 195 static inline int read_env(struct mmc *mmc, unsigned long size,
 196                            unsigned long offset, const void *buffer)
 197 {
 198         uint blk_start, blk_cnt, n;
 199         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 200
 201         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 202         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 203
 204         n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
 205
 206         return (n == blk_cnt) ? 0 : -1;
 207 }
 208
 209 #ifdef CONFIG_ENV_OFFSET_REDUND
 210 static int env_mmc_load(void)
 211 {
 212 #if !defined(ENV_IS_EMBEDDED)
 213         struct mmc *mmc;
 214         u32 offset1, offset2;
 215         int read1_fail = 0, read2_fail = 0;
 216         int ret;
 217         int dev = mmc_get_env_dev();
 218         const char *errmsg = NULL;
 219
 220         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
 221         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
 222
 223         mmc = find_mmc_device(dev);
 224
 225         errmsg = init_mmc_for_env(mmc);
 226         if (errmsg) {
 227                 ret = -EIO;
 228                 goto err;
 229         }
 230
 231         if (mmc_get_env_addr(mmc, 0, &offset1) ||
 232             mmc_get_env_addr(mmc, 1, &offset2)) {
 233                 ret = -EIO;
 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         if (read1_fail && read2_fail) {
 247                 errmsg = "!bad CRC";
 248                 ret = -EIO;
 249                 goto fini;
 250         } else if (!read1_fail && read2_fail) {
 251                 gd->env_valid = ENV_VALID;
 252                 env_import((char *)tmp_env1, 1);
 253         } else if (read1_fail && !read2_fail) {
 254                 gd->env_valid = ENV_REDUND;
 255                 env_import((char *)tmp_env2, 1);
 256         } else {
 257                 env_import_redund((char *)tmp_env1, (char *)tmp_env2);
 258         }
 259
 260         ret = 0;
 261
 262 fini:
 263         fini_mmc_for_env(mmc);
 264 err:
 265         if (ret)
 266                 set_default_env(errmsg);
 267
 268 #endif
 269         return ret;
 270 }
 271 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 272 static int env_mmc_load(void)
 273 {
 274 #if !defined(ENV_IS_EMBEDDED)
 275         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 276         struct mmc *mmc;
 277         u32 offset;
 278         int ret;
 279         int dev = mmc_get_env_dev();
 280         const char *errmsg;
 281
 282         mmc = find_mmc_device(dev);
 283
 284         errmsg = init_mmc_for_env(mmc);
 285         if (errmsg) {
 286                 ret = -EIO;
 287                 goto err;
 288         }
 289
 290         if (mmc_get_env_addr(mmc, 0, &offset)) {
 291                 ret = -EIO;
 292                 goto fini;
 293         }
 294
 295         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 296                 errmsg = "!read failed";
 297                 ret = -EIO;
 298                 goto fini;
 299         }
 300
 301         env_import(buf, 1);
 302         ret = 0;
 303
 304 fini:
 305         fini_mmc_for_env(mmc);
 306 err:
 307         if (ret)
 308                 set_default_env(errmsg);
 309 #endif
 310         return ret;
 311 }
 312 #endif /* CONFIG_ENV_OFFSET_REDUND */
 313
 314 U_BOOT_ENV_LOCATION(mmc) = {
 315         .location       = ENVL_MMC,
 316         ENV_NAME("MMC")
 317         .load           = env_mmc_load,
 318 #ifndef CONFIG_SPL_BUILD
 319         .save           = env_save_ptr(env_mmc_save),
 320 #endif
 321 };