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 	env_set_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 );
47