ec/google: Generalize communication protocol support in EC drivers.

Since EC protocol v3, the packet format will be the same for all buses (inclding
I2C, SPI, and LPC). That will simplify the implementation in each individual bus
driver source file.

To prepare for that, we will move the protocol part into crosec_proto.c:
crosec_command_proto, with bus driver in callback "crosec_io".

Change-Id: I9ccd19a57a182899dd1ef1cd90598679c1546295
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/3749
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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

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;
+}

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 */