diff --git a/src/ec/google/chromeec/Makefile.inc b/src/ec/google/chromeec/Makefile.inc
index 922c1fe355..73b5b5e959 100644
--- a/src/ec/google/chromeec/Makefile.inc
+++ b/src/ec/google/chromeec/Makefile.inc
@@ -1,9 +1,9 @@
-ramstage-y += ec.c
+ramstage-y += ec.c crosec_proto.c
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_I2C) += ec_i2c.c
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_LPC) += ec_lpc.c
-smm-y += ec.c
+smm-y += ec.c crosec_proto.c
 smm-$(CONFIG_EC_GOOGLE_CHROMEEC_I2C) += ec_i2c.c
 smm-$(CONFIG_EC_GOOGLE_CHROMEEC_LPC) += ec_lpc.c
-romstage-y += ec.c
+romstage-y += ec.c crosec_proto.c
 romstage-$(CONFIG_EC_GOOGLE_CHROMEEC_I2C) += ec_i2c.c
 romstage-$(CONFIG_EC_GOOGLE_CHROMEEC_LPC) += ec_lpc.c
diff --git a/src/ec/google/chromeec/crosec_proto.c b/src/ec/google/chromeec/crosec_proto.c
new file mode 100644
index 0000000000..016de8d483
--- /dev/null
+++ b/src/ec/google/chromeec/crosec_proto.c
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+#include <stdint.h>
+#include <string.h>
+#include "ec.h"
+#include "ec_commands.h"
+#include "ec_message.h"
+
+int crosec_command_proto(struct chromeec_command *cec_command,
+			 crosec_io_t crosec_io, void *context)
+{
+	// TODO(hungte) Add v3 protocol.
+	return -1;
+}
diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h
index 7679a8bcc6..13e9f234b1 100644
--- a/src/ec/google/chromeec/ec.h
+++ b/src/ec/google/chromeec/ec.h
@@ -21,6 +21,8 @@
 
 #ifndef _EC_GOOGLE_CHROMEEC_EC_H
 #define _EC_GOOGLE_CHROMEEC_EC_H
+#include <stddef.h>
+#include <stdint.h>
 
 #ifndef __PRE_RAM__
 u32 google_chromeec_get_wake_mask(void);
@@ -60,6 +62,13 @@ struct chromeec_command {
 				   * actual received size out */
 };
 
+/* internal standard implementation for EC command protocols. */
+typedef int (*crosec_io_t)(uint8_t *write_bytes, size_t write_size,
+			   uint8_t *read_bytes, size_t read_size,
+			   void *context);
+int crosec_command_proto(struct chromeec_command *cec_command,
+			 crosec_io_t crosec_io, void *context);
+
 int google_chromeec_command(struct chromeec_command *cec_command);
 
 #endif /* _EC_GOOGLE_CHROMEEC_EC_H */