mediatek: Move watchdog timer code to a common directory

Move watchdog timer (WDT) code which can be reused into a common
directory under soc/mediatek.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Elm

Change-Id: Icbeb04f775c3c0fdc18dd198df8591f5c4b6ddce
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27025
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/soc/mediatek/common/include/soc/wdt.h b/src/soc/mediatek/common/include/soc/wdt.h
new file mode 100644
index 0000000000..a15434c70d
--- /dev/null
+++ b/src/soc/mediatek/common/include/soc/wdt.h
@@ -0,0 +1,53 @@
+/*
+ * 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 SOC_MEDIATEK_COMMON_WDT_H
+#define SOC_MEDIATEK_COMMON_WDT_H
+
+#include <stdint.h>
+
+struct mtk_wdt_regs {
+	u32 wdt_mode;
+	u32 wdt_length;
+	u32 wdt_restart;
+	u32 wdt_status;
+	u32 wdt_interval;
+	u32 wdt_swrst;
+	u32 wdt_swsysrst;
+	u32 reserved[9];
+	u32 wdt_debug_ctrl;
+};
+
+/* WDT_MODE */
+enum {
+	MTK_WDT_MODE_KEY	= 0x22000000,
+	MTK_WDT_MODE_DUAL_MODE	= 1 << 6,
+	MTK_WDT_MODE_IRQ	= 1 << 3,
+	MTK_WDT_MODE_EXTEN	= 1 << 2,
+	MTK_WDT_MODE_EXT_POL	= 1 << 1,
+	MTK_WDT_MODE_ENABLE	= 1 << 0
+};
+
+/* WDT_RESET */
+enum {
+	MTK_WDT_SWRST_KEY	= 0x1209,
+	MTK_WDT_STA_SPM_RST	= 1 << 1,
+	MTK_WDT_STA_SW_RST	= 1 << 30,
+	MTK_WDT_STA_HW_RST	= 1 << 31
+};
+
+int mtk_wdt_init(void);
+
+#endif /* SOC_MEDIATEK_COMMON_WDT_H */