google/kukui: Set up GPIOs for ChromeOS

Set up EC interrupt GPIO to boot depthcharge. Without this patch,
depthcharge will fail to detect EC interrupt GPIO.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui and see in logs, that depthcharge detects
     EC interrupt GPIO.

Change-Id: I0ec2c70c189a059219954e0384aaf98995285728
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/28250
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/mainboard/google/kukui/Makefile.inc

@@ -1,4 +1,5 @@
 bootblock-y += bootblock.c
+bootblock-y += chromeos.c
 bootblock-y += memlayout.ld
 decompressor-y += memlayout.ld
 

src/mainboard/google/kukui/bootblock.c

@@ -18,10 +18,14 @@
 #include <soc/gpio.h>
 #include <soc/spi.h>
 
+#include "gpio.h"
+
 #define BOOTBLOCK_EN_L (GPIO(KPROW0))
 
 void bootblock_mainboard_init(void)
 {
+	setup_chromeos_gpios();
+
 	/* Turn on real eMMC. */
 	gpio_output(BOOTBLOCK_EN_L, 1);
 

src/mainboard/google/kukui/chromeos.c

@@ -15,9 +15,21 @@
 
 #include <bootmode.h>
 #include <boot/coreboot_tables.h>
+#include <gpio.h>
+
+#include "gpio.h"
+
+void setup_chromeos_gpios(void)
+{
+	gpio_input_pullup(EC_IRQ);
+}
 
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
+	struct lb_gpio chromeos_gpios[] = {
+		{EC_IRQ.id, ACTIVE_LOW, -1, "EC interrupt"},
+	};
+	lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
 }
 
 int get_recovery_mode_switch(void)

src/mainboard/google/kukui/gpio.h

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 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.
+ */
+
+#ifndef __MAINBOARD_GOOGLE_KUKUI_GPIO_H__
+#define __MAINBOARD_GOOGLE_KUKUI_GPIO_H__
+
+#include <soc/gpio.h>
+
+#define EC_IRQ	GPIO(PERIPHERAL_EN1)
+
+void setup_chromeos_gpios(void);
+
+#endif