secure_boot: enable chain of trust for ARM platforms

Chain of Trust is enabled for ARM platforms (LS1021 and LS1043).
In board_late_init(), fsl_setenv_chain_of_trust() is called which
will perform the following:
- If boot mode is non-secure, return (No Change)
- If boot mode is secure, set the following environmet variables:
   bootdelay = 0 (To disable Boot Prompt)
   bootcmd = CONFIG_CHAIN_BOOT_CMD (Validate and execute Boot script)

Signed-off-by: Aneesh Bansal <aneesh.bansal@nxp.com>
Acked-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/soc.c

@@ -12,6 +12,9 @@
 #include <asm/io.h>
 #include <asm/global_data.h>
 #include <asm/arch-fsl-layerscape/config.h>
+#ifdef CONFIG_CHAIN_OF_TRUST
+#include <fsl_validate.h>
+#endif
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -241,6 +244,9 @@ int board_late_init(void)
 #ifdef CONFIG_SCSI_AHCI_PLAT
 	sata_init();
 #endif
+#ifdef CONFIG_CHAIN_OF_TRUST
+	fsl_setenv_chain_of_trust();
+#endif
 
 	return 0;
 }

board/freescale/common/Makefile

@@ -76,5 +76,6 @@ obj-$(CONFIG_LAYERSCAPE_NS_ACCESS)	+= ns_access.o
 ifdef CONFIG_SECURE_BOOT
 obj-$(CONFIG_CMD_ESBC_VALIDATE) += fsl_validate.o cmd_esbc_validate.o
 endif
+obj-$(CONFIG_CHAIN_OF_TRUST) += fsl_chain_of_trust.o
 
 endif

board/freescale/common/fsl_chain_of_trust.c

@@ -51,3 +51,20 @@ int fsl_check_boot_mode_secure(void)
 #endif
 	return 0;
 }
+
+int fsl_setenv_chain_of_trust(void)
+{
+	/* Check Boot Mode
+	 * If Boot Mode is Non-Secure, no changes are required
+	 */
+	if (fsl_check_boot_mode_secure() == 0)
+		return 0;
+
+	/* If Boot mode is Secure, set the environment variables
+	 * bootdelay = 0 (To disable Boot Prompt)
+	 * bootcmd = CONFIG_CHAIN_BOOT_CMD (Validate and execute Boot script)
+	 */
+	setenv("bootdelay", "0");
+	setenv("bootcmd", CONFIG_CHAIN_BOOT_CMD);
+	return 0;
+}

board/freescale/ls1021aqds/ls1021aqds.c

@@ -22,6 +22,7 @@
 #include <fsl_sec.h>
 #include <spl.h>
 #include <fsl_devdis.h>
+#include <fsl_validate.h>
 
 #include "../common/sleep.h"
 #include "../common/qixis.h"
@@ -369,6 +370,9 @@ int board_late_init(void)
 #ifdef CONFIG_SCSI_AHCI_PLAT
 	ls1021a_sata_init();
 #endif
+#ifdef CONFIG_CHAIN_OF_TRUST
+	fsl_setenv_chain_of_trust();
+#endif
 
 	return 0;
 }

board/freescale/ls1021atwr/ls1021atwr.c

@@ -30,6 +30,7 @@
 #ifdef CONFIG_U_QE
 #include "../../../drivers/qe/qe.h"
 #endif
+#include <fsl_validate.h>
 
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -549,6 +550,9 @@ int board_late_init(void)
 #ifdef CONFIG_SCSI_AHCI_PLAT
 	ls1021a_sata_init();
 #endif
+#ifdef CONFIG_CHAIN_OF_TRUST
+	fsl_setenv_chain_of_trust();
+#endif
 
 	return 0;
 }

include/fsl_validate.h

@@ -205,4 +205,6 @@ int fsl_secboot_blob_encap(cmd_tbl_t *cmdtp, int flag, int argc,
 int fsl_secboot_blob_decap(cmd_tbl_t *cmdtp, int flag, int argc,
 	char * const argv[]);
 
+int fsl_check_boot_mode_secure(void);
+int fsl_setenv_chain_of_trust(void);
 #endif