env: ti: Add environment variables to boot from UFS

Add environment variables to boot kernel from a filesystem contained in
the 2nd UFS LUN. The user can boot from a ufs filesystem just by
entering the following commands.

=> setenv boot ufs
=> boot

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

include/configs/j721e_evm.h

@@ -13,6 +13,7 @@
 #include <config_distro_bootcmd.h>
 #include <environment/ti/mmc.h>
 #include <environment/ti/k3_rproc.h>
+#include <environment/ti/ufs.h>
 
 #define CONFIG_ENV_SIZE			(128 << 10)
 
@@ -103,7 +104,8 @@
 	DEFAULT_MMC_TI_ARGS						\
 	EXTRA_ENV_J721E_BOARD_SETTINGS					\
 	EXTRA_ENV_J721E_BOARD_SETTINGS_MMC				\
-	EXTRA_ENV_RPROC_SETTINGS
+	EXTRA_ENV_RPROC_SETTINGS					\
+	DEFAULT_UFS_TI_ARGS
 
 /* Now for the remaining common defines */
 #include <configs/ti_armv7_common.h>

include/environment/ti/ufs.h

@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Environment variable definitions for UFS on TI boards.
+ */
+
+#ifndef __TI_UFS_H
+#define __TI_UFS_H
+
+#define DEFAULT_UFS_TI_ARGS \
+	"scsirootfstype=ext4 rootwait\0" \
+	"ufs_finduuid=part uuid scsi ${bootpart} uuid\0" \
+	"args_ufs=setenv devtype scsi;setenv bootpart 1:1;" \
+	"run ufs_finduuid;setenv bootargs console = ${console} " \
+		"${optargs}" \
+		"root=PARTUUID=${uuid} rw " \
+		"rootfstype=${scsirootfstype};" \
+		"setenv devtype scsi;" \
+		"setenv bootpart 1:1\0" \
+	"init_ufs=ufs init; scsi scan; run args_ufs\0" \
+	"get_kern_ufs=load ${devtype} ${bootpart} ${loadaddr} ${bootdir}/${name_kern}\0" \
+	"get_fdt_ufs=load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
+	"get_overlay_ufs=" \
+		"fdt address ${fdtaddr};" \
+		"fdt resize 0x100000;" \
+		"for overlay in $name_overlays;" \
+		"do;" \
+		"load scsi ${bootpart} ${overlayaddr} ${bootdir}/${overlay} && " \
+		"fdt apply ${overlayaddr};" \
+		"done;\0"
+
+#endif