#!/bin/bash

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

COMMON_SH=/usr/lib/crosutils/common.sh
. "${COMMON_SH}" || exit 1

# Flags
DEFINE_string board "${DEFAULT_BOARD}" \
	"The board to run debugger on."
DEFINE_string image "" \
	"Full pathname of the EC firmware image to flash."
DEFINE_boolean ro "${FLAGS_FALSE}" \
	"Write only the read-only partition"

# Parse command line
FLAGS_HELP="usage: $0 [flags]"
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
check_flags_only_and_allow_null_arg "$@" && set --

BOARD=${FLAGS_board}
BOARD_ROOT=/build/${BOARD}

# Possible default EC images
if [ "${FLAGS_ro}" = ${FLAGS_TRUE} ] ; then
	EC_FILE=ec.RO.flat
else
	EC_FILE=ec.bin
fi
EMERGE_BUILD=${BOARD_ROOT}/firmware/${EC_FILE}
LOCAL_BUILD=${SRC_ROOT}/platform/ec/build/${BOARD}/${EC_FILE}

# Find the EC image to use
function ec_image() {
	# No image specified on the command line, try default ones
	if [[ ! -z "${FLAGS_image}" ]] ; then
		if [ ! -r "${FLAGS_image}" ]; then
			die "Invalid image path : ${FLAGS_image}"
		fi
		echo "${FLAGS_image}"
		return
	else
		if [ -x "${LOCAL_BUILD}" ]; then
			echo "${LOCAL_BUILD}"
			return
		fi
		if [ -x "${EMERGE_BUILD}" ]; then
			echo "${EMERGE_BUILD}"
			return
		fi
	fi
	die "no EC image found : build one or specify one."
}

# Find the EC UART on the servo v2
function ec_uart() {
	SERVOD_FAIL="Cannot communicate with servo. is servod running ?"
	(dut-control uart1_pty || die "${SERVOD_FAIL}") | cut -d: -f2
}

# Servo variables management

SERVO_VARS="uart1_en uart1_parity uart1_baudrate \
jtag_buf_on_flex_en jtag_buf_en spi1_vref"

function dut_control() {
	dut-control "$1" >/dev/null
}

function servo_save() {
	dut-control ${SERVO_VARS}
}

function servo_restore() {
	echo "$1" | while read line
	do
		dut_control "$line"
	done
}

# Board specific flashing scripts

function flash_daisy() {
	TOOL_PATH="${SCRIPT_LOCATION}/../build/${BOARD}/util:$PATH"
	STM32MON=$(PATH="${TOOL_PATH}" which stm32mon)
	if [ ! -x "$STM32MON" ]; then
		die "no stm32mon util found."
	fi

	info "Using serial flasher : ${STM32MON}"

	dut_control uart1_en:on
	dut_control uart1_parity:even
	dut_control uart1_baudrate:115200
	# force the EC to boot in serial monitor mode
	dut_control spi1_vref:pp3300
	# reset the EC
	dut_control cold_reset:on
	dut_control cold_reset:off
	${STM32MON} -d ${EC_UART} -e -w ${IMG}
}

function flash_link() {
	IMG_SIZE=262144
	OCD_CFG="servo_v2_slower.cfg"
	OCD_PATH="${SRC_ROOT}/platform/ec/chip/lm4/openocd"
	OCD_CMDS="init ; flash_lm4 ${IMG} 0 262144 ; exit"

	dut_control jtag_buf_on_flex_en:on
	dut_control jtag_buf_en:on

	sudo openocd -s "${OCD_PATH}" -f "${OCD_CFG}" -c "${OCD_CMDS}"
}

IMG="$(ec_image)"
info "Using EC image : ${IMG}"

EC_UART="$(ec_uart)"
info "EC UART pty : ${EC_UART}"

save="$(servo_save)"

case "${BOARD}" in
	daisy | snow ) flash_daisy ;;
	link ) flash_link ;;
	*) die "board ${BOARD} not supported" ;;
esac

info "Flashing done."

# Restore servo settings
servo_restore "$save"

# reset the EC
dut_control cold_reset:on
dut_control cold_reset:off