env/sata.c

   1 /*
   2  * (C) Copyright 2010-2016 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 <errno.h>
  15 #include <memalign.h>
  16 #include <sata.h>
  17 #include <search.h>
  18
  19 #if defined(CONFIG_ENV_SIZE_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  20 #error ENV REDUND not supported
  21 #endif
  22
  23 #if !defined(CONFIG_ENV_OFFSET) || !defined(CONFIG_ENV_SIZE)
  24 #error CONFIG_ENV_OFFSET or CONFIG_ENV_SIZE not defined
  25 #endif
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 __weak int sata_get_env_dev(void)
  30 {
  31         return CONFIG_SYS_SATA_ENV_DEV;
  32 }
  33
  34 #ifdef CONFIG_CMD_SAVEENV
  35 static inline int write_env(struct blk_desc *sata, unsigned long size,
  36                             unsigned long offset, void *buffer)
  37 {
  38         uint blk_start, blk_cnt, n;
  39
  40         blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
  41         blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
  42
  43         n = blk_dwrite(sata, blk_start, blk_cnt, buffer);
  44
  45         return (n == blk_cnt) ? 0 : -1;
  46 }
  47
  48 static int env_sata_save(void)
  49 {
  50         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
  51         struct blk_desc *sata = NULL;
  52         int env_sata, ret;
  53
  54         if (sata_initialize())
  55                 return 1;
  56
  57         env_sata = sata_get_env_dev();
  58
  59         sata = sata_get_dev(env_sata);
  60         if (sata == NULL) {
  61                 printf("Unknown SATA(%d) device for environment!\n",
  62                        env_sata);
  63                 return 1;
  64         }
  65
  66         ret = env_export(env_new);
  67         if (ret)
  68                 return 1;
  69
  70         printf("Writing to SATA(%d)...", env_sata);
  71         if (write_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, &env_new)) {
  72                 puts("failed\n");
  73                 return 1;
  74         }
  75
  76         puts("done\n");
  77         return 0;
  78 }
  79 #endif /* CONFIG_CMD_SAVEENV */
  80
  81 static inline int read_env(struct blk_desc *sata, unsigned long size,
  82                            unsigned long offset, void *buffer)
  83 {
  84         uint blk_start, blk_cnt, n;
  85
  86         blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
  87         blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
  88
  89         n = blk_dread(sata, blk_start, blk_cnt, buffer);
  90
  91         return (n == blk_cnt) ? 0 : -1;
  92 }
  93
  94 static void env_sata_load(void)
  95 {
  96         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  97         struct blk_desc *sata = NULL;
  98         int env_sata;
  99
 100         if (sata_initialize())
 101                 return -EIO;
 102
 103         env_sata = sata_get_env_dev();
 104
 105         sata = sata_get_dev(env_sata);
 106         if (sata == NULL) {
 107                 printf("Unknown SATA(%d) device for environment!\n", env_sata);
 108                 return -EIO;
 109         }
 110
 111         if (read_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf)) {
 112                 set_default_env(NULL);
 113                 return -EIO;
 114         }
 115
 116         return env_import(buf, 1);
 117 }
 118
 119 U_BOOT_ENV_LOCATION(sata) = {
 120         .location       = ENVL_ESATA,
 121         ENV_NAME("SATA")
 122         .load           = env_sata_load,
 123         .save           = env_save_ptr(env_sata_save),
 124 };