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>

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

@@ -15,6 +15,7 @@ $(call force,CFG_PL310_LOCKED,y)
 $(call force,CFG_SECURE_TIME_SOURCE_REE,y)
 arm32-platform-cpuarch		:= cortex-a9
 else
+$(call force,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 +176,24 @@ 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));
+}
+
+/* TODO */
+int tee_otp_get_die_id(uint8_t *buffer, size_t len)
+{
+	size_t i;
+
+	char pattern[4] = { 'B', 'E', 'E', 'F' };
+	for (i = 0; i < len; i++)
+		buffer[i] = pattern[i % 4];
+
+	return 0;
+}
+
+#endif