google/kukui: Implement HW reset function

Asserting GPIO PERIPHERAL_EN8 will send a signal to EC to trigger a HW
reset for SoC and H1.

BUG=b:80501386
BRANCH=none
TEST=emerge-kukui coreboot; manually verified the do_board_reset() on
     Kukui P1

Change-Id: I9afad84af2031a766bc08fc76c8b5f55588c453a
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/31118
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/mainboard/google/kukui/reset.c b/src/mainboard/google/kukui/reset.c
new file mode 100644
index 0000000000..609ecb4c1a
--- /dev/null
+++ b/src/mainboard/google/kukui/reset.c
@@ -0,0 +1,24 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 MediaTek Inc.
+ *
+ * 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.
+ */
+
+#include <gpio.h>
+#include <reset.h>
+
+#include "gpio.h"
+
+void do_board_reset(void)
+{
+	gpio_output(GPIO_RESET, 1);
+}