imx: mx7dsabresd: move mmc_get_env_devno to soc code

Move mmc_get_env_devno to soc.c and rename to mmc_get_env_dev to
match the one in common/env_mmc.c.
Introduce a weak function board_mmc_get_env_dev. Different
boards can implement this according to sdhc controller which
is used by the board.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx7/soc.c

@@ -288,6 +288,27 @@ enum boot_device get_boot_device(void)
 	return boot_dev;
 }
 
+#ifdef CONFIG_ENV_IS_IN_MMC
+__weak int board_mmc_get_env_dev(int devno)
+{
+	return CONFIG_SYS_MMC_ENV_DEV;
+}
+
+int mmc_get_env_dev(void)
+{
+	struct bootrom_sw_info **p =
+		(struct bootrom_sw_info **)ROM_SW_INFO_ADDR;
+	int devno = (*p)->boot_dev_instance;
+	u8 boot_type = (*p)->boot_dev_type;
+
+	/* If not boot from sd/mmc, use default value */
+	if ((boot_type != BOOT_TYPE_SD) && (boot_type != BOOT_TYPE_MMC))
+		return CONFIG_SYS_MMC_ENV_DEV;
+
+	return board_mmc_get_env_dev(devno);
+}
+#endif
+
 void s_init(void)
 {
 #if !defined CONFIG_SPL_BUILD

board/freescale/mx7dsabresd/mx7dsabresd.c

@@ -328,22 +328,12 @@ static struct fsl_esdhc_cfg usdhc_cfg[3] = {
 	{USDHC3_BASE_ADDR},
 };
 
-static int mmc_get_env_devno(void)
+int board_mmc_get_env_dev(int devno)
 {
-	struct bootrom_sw_info **p =
-		(struct bootrom_sw_info **)ROM_SW_INFO_ADDR;
+	if (devno == 2)
+		devno--;
 
-	u8 boot_type = (*p)->boot_dev_type;
-	u8 dev_no = (*p)->boot_dev_instance;
-
-	/* If not boot from sd/mmc, use default value */
-	if ((boot_type != BOOT_TYPE_SD) && (boot_type != BOOT_TYPE_MMC))
-		return CONFIG_SYS_MMC_ENV_DEV;
-
-	if (dev_no == 2)
-		dev_no--;
-
-	return dev_no;
+	return devno;
 }
 
 static int mmc_map_to_kernel_blk(int dev_no)
@@ -432,7 +422,7 @@ static void mmc_late_init(void)
 {
 	char cmd[32];
 	char mmcblk[32];
-	u32 dev_no = mmc_get_env_devno();
+	u32 dev_no = mmc_get_env_dev();
 
 	if (!check_mmc_autodetect())
 		return;