env/mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
   4  */
   5
   6 /* #define DEBUG */
   7
   8 #include <common.h>
   9
  10 #include <command.h>
  11 #include <env.h>
  12 #include <env_internal.h>
  13 #include <fdtdec.h>
  14 #include <linux/stddef.h>
  15 #include <malloc.h>
  16 #include <memalign.h>
  17 #include <mmc.h>
  18 #include <part.h>
  19 #include <search.h>
  20 #include <errno.h>
  21
  22 #define __STR(X) #X
  23 #define STR(X) __STR(X)
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 #if CONFIG_IS_ENABLED(OF_CONTROL)
  28 static inline int mmc_offset_try_partition(const char *str, s64 *val)
  29 {
  30         disk_partition_t info;
  31         struct blk_desc *desc;
  32         int len, i, ret;
  33
  34         ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &desc);
  35         if (ret < 0)
  36                 return (ret);
  37
  38         for (i = 1;;i++) {
  39                 ret = part_get_info(desc, i, &info);
  40                 if (ret < 0)
  41                         return ret;
  42
  43                 if (!strncmp((const char *)info.name, str, sizeof(str)))
  44                         break;
  45         }
  46
  47         /* round up to info.blksz */
  48         len = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
  49
  50         /* use the top of the partion for the environment */
  51         *val = (info.start + info.size - 1) - len / info.blksz;
  52
  53         return 0;
  54 }
  55
  56 static inline s64 mmc_offset(int copy)
  57 {
  58         const struct {
  59                 const char *offset_redund;
  60                 const char *partition;
  61                 const char *offset;
  62         } dt_prop = {
  63                 .offset_redund = "u-boot,mmc-env-offset-redundant",
  64                 .partition = "u-boot,mmc-env-partition",
  65                 .offset = "u-boot,mmc-env-offset",
  66         };
  67         s64 val = 0, defvalue;
  68         const char *propname;
  69         const char *str;
  70         int err;
  71
  72         /* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  73         str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
  74         if (str) {
  75                 /* try to place the environment at end of the partition */
  76                 err = mmc_offset_try_partition(str, &val);
  77                 if (!err)
  78                         return val;
  79         }
  80
  81         defvalue = CONFIG_ENV_OFFSET;
  82         propname = dt_prop.offset;
  83
  84 #if defined(CONFIG_ENV_OFFSET_REDUND)
  85         if (copy) {
  86                 defvalue = CONFIG_ENV_OFFSET_REDUND;
  87                 propname = dt_prop.offset_redund;
  88         }
  89 #endif
  90         return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  91 }
  92 #else
  93 static inline s64 mmc_offset(int copy)
  94 {
  95         s64 offset = CONFIG_ENV_OFFSET;
  96
  97 #if defined(CONFIG_ENV_OFFSET_REDUND)
  98         if (copy)
  99                 offset = CONFIG_ENV_OFFSET_REDUND;
 100 #endif
 101         return offset;
 102 }
 103 #endif
 104
 105 __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
 106 {
 107         s64 offset = mmc_offset(copy);
 108
 109         if (offset < 0)
 110                 offset += mmc->capacity;
 111
 112         *env_addr = offset;
 113
 114         return 0;
 115 }
 116
 117 __weak int mmc_get_env_dev(void)
 118 {
 119         return CONFIG_SYS_MMC_ENV_DEV;
 120 }
 121
 122 #ifdef CONFIG_SYS_MMC_ENV_PART
 123 __weak uint mmc_get_env_part(struct mmc *mmc)
 124 {
 125         return CONFIG_SYS_MMC_ENV_PART;
 126 }
 127
 128 static unsigned char env_mmc_orig_hwpart;
 129
 130 static int mmc_set_env_part(struct mmc *mmc)
 131 {
 132         uint part = mmc_get_env_part(mmc);
 133         int dev = mmc_get_env_dev();
 134         int ret = 0;
 135
 136         env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
 137         ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
 138         if (ret)
 139                 puts("MMC partition switch failed\n");
 140
 141         return ret;
 142 }
 143 #else
 144 static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
 145 #endif
 146
 147 static const char *init_mmc_for_env(struct mmc *mmc)
 148 {
 149         if (!mmc)
 150                 return "No MMC card found";
 151
 152 #if CONFIG_IS_ENABLED(BLK)
 153         struct udevice *dev;
 154
 155         if (blk_get_from_parent(mmc->dev, &dev))
 156                 return "No block device";
 157 #else
 158         if (mmc_init(mmc))
 159                 return "MMC init failed";
 160 #endif
 161         if (mmc_set_env_part(mmc))
 162                 return "MMC partition switch failed";
 163
 164         return NULL;
 165 }
 166
 167 static void fini_mmc_for_env(struct mmc *mmc)
 168 {
 169 #ifdef CONFIG_SYS_MMC_ENV_PART
 170         int dev = mmc_get_env_dev();
 171
 172         blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
 173 #endif
 174 }
 175
 176 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
 177 static inline int write_env(struct mmc *mmc, unsigned long size,
 178                             unsigned long offset, const void *buffer)
 179 {
 180         uint blk_start, blk_cnt, n;
 181         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 182
 183         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 184         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 185
 186         n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
 187
 188         return (n == blk_cnt) ? 0 : -1;
 189 }
 190
 191 static int env_mmc_save(void)
 192 {
 193         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 194         int dev = mmc_get_env_dev();
 195         struct mmc *mmc = find_mmc_device(dev);
 196         u32     offset;
 197         int     ret, copy = 0;
 198         const char *errmsg;
 199
 200         errmsg = init_mmc_for_env(mmc);
 201         if (errmsg) {
 202                 printf("%s\n", errmsg);
 203                 return 1;
 204         }
 205
 206         ret = env_export(env_new);
 207         if (ret)
 208                 goto fini;
 209
 210 #ifdef CONFIG_ENV_OFFSET_REDUND
 211         if (gd->env_valid == ENV_VALID)
 212                 copy = 1;
 213 #endif
 214
 215         if (mmc_get_env_addr(mmc, copy, &offset)) {
 216                 ret = 1;
 217                 goto fini;
 218         }
 219
 220         printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
 221         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 222                 puts("failed\n");
 223                 ret = 1;
 224                 goto fini;
 225         }
 226
 227         ret = 0;
 228
 229 #ifdef CONFIG_ENV_OFFSET_REDUND
 230         gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
 231 #endif
 232
 233 fini:
 234         fini_mmc_for_env(mmc);
 235         return ret;
 236 }
 237
 238 #if defined(CONFIG_CMD_ERASEENV)
 239 static inline int erase_env(struct mmc *mmc, unsigned long size,
 240                             unsigned long offset)
 241 {
 242         uint blk_start, blk_cnt, n;
 243         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 244
 245         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 246         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 247
 248         n = blk_derase(desc, blk_start, blk_cnt);
 249         printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
 250
 251         return (n == blk_cnt) ? 0 : 1;
 252 }
 253
 254 static int env_mmc_erase(void)
 255 {
 256         int dev = mmc_get_env_dev();
 257         struct mmc *mmc = find_mmc_device(dev);
 258         int     ret, copy = 0;
 259         u32     offset;
 260         const char *errmsg;
 261
 262         errmsg = init_mmc_for_env(mmc);
 263         if (errmsg) {
 264                 printf("%s\n", errmsg);
 265                 return 1;
 266         }
 267
 268         if (mmc_get_env_addr(mmc, copy, &offset))
 269                 return CMD_RET_FAILURE;
 270
 271         ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
 272
 273 #ifdef CONFIG_ENV_OFFSET_REDUND
 274         copy = 1;
 275
 276         if (mmc_get_env_addr(mmc, copy, &offset))
 277                 return CMD_RET_FAILURE;
 278
 279         ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
 280 #endif
 281
 282         return ret;
 283 }
 284 #endif /* CONFIG_CMD_ERASEENV */
 285 #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
 286
 287 static inline int read_env(struct mmc *mmc, unsigned long size,
 288                            unsigned long offset, const void *buffer)
 289 {
 290         uint blk_start, blk_cnt, n;
 291         struct blk_desc *desc = mmc_get_blk_desc(mmc);
 292
 293         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 294         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 295
 296         n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
 297
 298         return (n == blk_cnt) ? 0 : -1;
 299 }
 300
 301 #ifdef CONFIG_ENV_OFFSET_REDUND
 302 static int env_mmc_load(void)
 303 {
 304 #if !defined(ENV_IS_EMBEDDED)
 305         struct mmc *mmc;
 306         u32 offset1, offset2;
 307         int read1_fail = 0, read2_fail = 0;
 308         int ret;
 309         int dev = mmc_get_env_dev();
 310         const char *errmsg = NULL;
 311
 312         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
 313         ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
 314
 315         mmc_initialize(NULL);
 316
 317         mmc = find_mmc_device(dev);
 318
 319         errmsg = init_mmc_for_env(mmc);
 320         if (errmsg) {
 321                 ret = -EIO;
 322                 goto err;
 323         }
 324
 325         if (mmc_get_env_addr(mmc, 0, &offset1) ||
 326             mmc_get_env_addr(mmc, 1, &offset2)) {
 327                 ret = -EIO;
 328                 goto fini;
 329         }
 330
 331         read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
 332         read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
 333
 334         ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
 335                                 read2_fail);
 336
 337 fini:
 338         fini_mmc_for_env(mmc);
 339 err:
 340         if (ret)
 341                 env_set_default(errmsg, 0);
 342
 343 #endif
 344         return ret;
 345 }
 346 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 347 static int env_mmc_load(void)
 348 {
 349 #if !defined(ENV_IS_EMBEDDED)
 350         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 351         struct mmc *mmc;
 352         u32 offset;
 353         int ret;
 354         int dev = mmc_get_env_dev();
 355         const char *errmsg;
 356
 357         mmc = find_mmc_device(dev);
 358
 359         errmsg = init_mmc_for_env(mmc);
 360         if (errmsg) {
 361                 ret = -EIO;
 362                 goto err;
 363         }
 364
 365         if (mmc_get_env_addr(mmc, 0, &offset)) {
 366                 ret = -EIO;
 367                 goto fini;
 368         }
 369
 370         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 371                 errmsg = "!read failed";
 372                 ret = -EIO;
 373                 goto fini;
 374         }
 375
 376         ret = env_import(buf, 1);
 377
 378 fini:
 379         fini_mmc_for_env(mmc);
 380 err:
 381         if (ret)
 382                 env_set_default(errmsg, 0);
 383 #endif
 384         return ret;
 385 }
 386 #endif /* CONFIG_ENV_OFFSET_REDUND */
 387
 388 U_BOOT_ENV_LOCATION(mmc) = {
 389         .location       = ENVL_MMC,
 390         ENV_NAME("MMC")
 391         .load           = env_mmc_load,
 392 #ifndef CONFIG_SPL_BUILD
 393         .save           = env_save_ptr(env_mmc_save),
 394 #if defined(CONFIG_CMD_ERASEENV)
 395         .erase          = env_mmc_erase,
 396 #endif
 397 #endif
 398 };