1 files changed, 62 insertions, 0 deletions
diff --git a/src/mainboard/google/snow/wakeup.c b/src/mainboard/google/snow/wakeup.c
new file mode 100644
index 0000000000..33ea9d8fd1
--- /dev/null
+++ b/src/mainboard/google/snow/wakeup.c
@@ -0,0 +1,62 @@
+/*
+ * 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/gpio.h>
+#include <arch/hlt.h>
+#include <console/console.h>
+#include <cpu/samsung/exynos5250/gpio.h>
+#include <cpu/samsung/exynos5250/power.h>
+#include <cpu/samsung/exynos5-common/exynos5-common.h>
+
+#include "mainboard.h"
+
+static int wakeup_need_reset(void)
+{
+	/* The "wake up" event is not reliable (known as "bad wakeup") and needs
+	 * reset if GPIO value is high. */
+	return gpio_get_value(GPIO_Y10);
+}
+
+void board_wakeup(void)
+{
+	if (wakeup_need_reset())
+		power_reset();
+
+	power_init();  /* Ensure ps_hold_setup() for early wakeup. */
+	power_exit_wakeup();
+	/* Should never return. */
+	die("Failed to wake up.\n");
+}
+
+int board_get_wakeup_state()
+{
+	uint32_t status = power_read_reset_status();
+
+	/* DIDLE/LPA can be resumed without clock reset (ex, bootblock),
+	 * and SLEEP requires resetting clock (should be done in ROM stage).
+	 */
+
+	if (status == S5P_CHECK_DIDLE || status == S5P_CHECK_LPA)
+		return BOARD_WAKEUP_DIRECT;
+
+	if (status == S5P_CHECK_SLEEP)
+		return BOARD_WAKEUP_NEED_CLOCK_RESET;
+
+	return BOARD_IS_NOT_WAKEUP;
+}