arch/arm/mach-uniphier/mmc-first-dev.c

   1 /*
   2  * Copyright (C) 2016 Socionext Inc.
   3  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <mmc.h>
  10 #include <linux/errno.h>
  11
  12 static int find_first_mmc_device(void)
  13 {
  14         struct mmc *mmc;
  15         int i;
  16
  17         for (i = 0; (mmc = find_mmc_device(i)); i++) {
  18                 if (!mmc_init(mmc) && IS_MMC(mmc))
  19                         return i;
  20         }
  21
  22         return -ENODEV;
  23 }
  24
  25 int mmc_get_env_dev(void)
  26 {
  27         return find_first_mmc_device();
  28 }
  29
  30 static int do_mmcsetn(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  31 {
  32         int dev;
  33
  34         dev = find_first_mmc_device();
  35         if (dev < 0)
  36                 return CMD_RET_FAILURE;
  37
  38         setenv_ulong("mmc_first_dev", dev);
  39         return CMD_RET_SUCCESS;
  40 }
  41
  42 U_BOOT_CMD(
  43            mmcsetn,     1,      1,      do_mmcsetn,
  44         "Set the first MMC (not SD) dev number to \"mmc_first_dev\" environment",
  45         ""
  46 );