plat-ti: Add support for using HUK on DRA7xx/AM57xx

On DRA7xx/AM57xx the initial secure software will pass OP-TEE a
Hardware Unique Key (HUK), use this key when requested.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

core/arch/arm/plat-ti/conf.mk

@@ -15,6 +15,7 @@ $(call force,CFG_PL310_LOCKED,y)
 $(call force,CFG_SECURE_TIME_SOURCE_REE,y)
 arm32-platform-cpuarch		:= cortex-a9
 else
+CFG_OTP_SUPPORT ?= y
 $(call force,CFG_HWSUPP_MEM_PERM_PXN,y)
 $(call force,CFG_SECURE_TIME_SOURCE_CNTPCT,y)
 arm32-platform-cpuarch		:= cortex-a15

core/arch/arm/plat-ti/main.c

@@ -40,6 +40,7 @@
 #include <kernel/misc.h>
 #include <kernel/mutex.h>
 #include <kernel/tee_time.h>
+#include <kernel/tee_common_otp.h>
 #include <mm/core_mmu.h>
 #include <mm/core_memprot.h>
 #include <tee/entry_std.h>
@@ -175,3 +176,12 @@ void console_init(void)
 			     CONSOLE_UART_CLK_IN_HZ, CONSOLE_BAUDRATE);
 	register_serial_console(&console_data.chip);
 }
+
+#if defined(CFG_OTP_SUPPORT)
+
+void tee_otp_get_hw_unique_key(struct tee_hw_unique_key *hwkey)
+{
+	memcpy(&hwkey->data[0], &plat_huk[0], sizeof(hwkey->data));
+}
+
+#endif