From d0a6d7ce55ec40d23ad96b549d596afd8f70735c Mon Sep 17 00:00:00 2001
From: Aneesh Bansal <aneesh.bansal@nxp.com>
Date: Fri, 22 Jan 2016 16:37:27 +0530
Subject: [PATCH] secure_boot: enable chain of trust for PowerPC platforms

Chain of Trust is enabled for PowerPC platforms for Secure Boot.
CONFIG_BOARD_LATE_INIT is defined.
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/powerpc/cpu/mpc85xx/cpu_init.c        | 14 ++++++++++++++
 arch/powerpc/include/asm/fsl_secure_boot.h |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 13a7d0f664..d51616ba22 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -27,6 +27,9 @@
 #include <hwconfig.h>
 #include <linux/compiler.h>
 #include "mp.h"
+#ifdef CONFIG_CHAIN_OF_TRUST
+#include <fsl_validate.h>
+#endif
 #ifdef CONFIG_FSL_CAAM
 #include <fsl_sec.h>
 #endif
@@ -1009,3 +1012,14 @@ void cpu_secondary_init_r(void)
 	qe_reset();
 #endif
 }
+
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+#ifdef CONFIG_CHAIN_OF_TRUST
+	fsl_setenv_chain_of_trust();
+#endif
+
+	return 0;
+}
+#endif
diff --git a/arch/powerpc/include/asm/fsl_secure_boot.h b/arch/powerpc/include/asm/fsl_secure_boot.h
index 41058d11ad..c45cace552 100644
--- a/arch/powerpc/include/asm/fsl_secure_boot.h
+++ b/arch/powerpc/include/asm/fsl_secure_boot.h
@@ -87,6 +87,13 @@
 #define CONFIG_FSL_CAAM
 #endif
 
+/* fsl_setenv_chain_of_trust() must be called from
+ * board_late_init()
+ */
+#ifndef CONFIG_BOARD_LATE_INIT
+#define CONFIG_BOARD_LATE_INIT
+#endif
+
 /* If Boot Script is not on NOR and is required to be copied on RAM */
 #ifdef CONFIG_BOOTSCRIPT_COPY_RAM
 #define CONFIG_BS_HDR_ADDR_RAM		0x00010000
-- 
2.39.5