soc/mediatek/mt8186: Initialize watchdog

MT8186 requires writing speical value to mode register to clear
status register. The flow of clear status is different from other
platforms, so we override mtk_wdt_clr_status() for MT8186.

TEST=build pass
BUG=b:202871018

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I290b69573a8e58db76814e16b5c17c23413f1108
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58835
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8186/wdt.c b/src/soc/mediatek/mt8186/wdt.c
new file mode 100644
index 0000000000..d0e13d98e9
--- /dev/null
+++ b/src/soc/mediatek/mt8186/wdt.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on MT8186 Functional Specification
+ * Chapter number: 3.4
+ */
+
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/wdt.h>
+
+#define MTK_WDT_CLR_STATUS 0x22000000
+
+void mtk_wdt_clr_status(uint32_t wdt_sta)
+{
+	write32(&mtk_wdt->wdt_mode, wdt_sta | MTK_WDT_CLR_STATUS);
+}