soc/mediatek/mt8188: Initialize watchdog

Add watchdog support for MT8188.

This implementation is based on chapter 3.10.10 in MT8188 Functional
Specification.

TEST=build pass
BUG=b:233720142

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: Iaf56c78d89af53d0272583b463c050e69bbeb07a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65587
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/mt8188/Makefile.inc

@@ -6,6 +6,7 @@ all-y += ../common/uart.c
 
 bootblock-y += bootblock.c
 bootblock-y += ../common/mmu_operations.c
+bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c
 
 romstage-y += ../common/cbmem.c
 romstage-y += emi.c

src/soc/mediatek/mt8188/bootblock.c

@@ -2,8 +2,10 @@
 
 #include <bootblock_common.h>
 #include <soc/mmu_operations.h>
+#include <soc/wdt.h>
 
 void bootblock_soc_init(void)
 {
 	mtk_mmu_init();
+	mtk_wdt_init();
 }

src/soc/mediatek/mt8188/include/soc/wdt.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_MT8188_WDT_H
+#define SOC_MEDIATEK_MT8188_WDT_H
+
+#include <soc/wdt_common.h>
+
+#define MTK_WDT_SPM_THERMAL_VAL 1
+
+DEFINE_BIT(MTK_WDT_SPM_THERMAL_EN, 0)
+DEFINE_BIT(MTK_WDT_THERMAL_EN, 17)
+DEFINE_BIT(MTK_WDT_THERMAL_IRQ, 17)
+
+#endif /* SOC_MEDIATEK_MT8188_WDT_H */

src/soc/mediatek/mt8188/wdt.c

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on MT8188 Functional Specification
+ * Chapter number: 3.10.10
+ */
+
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/wdt.h>
+
+#define MTK_WDT_CLR_STATUS_VAL 0x22
+
+DEFINE_BITFIELD(MTK_WDT_CLR_STATUS, 31, 24)
+
+void mtk_wdt_clr_status(void)
+{
+	SET32_BITFIELDS(&mtk_wdt->wdt_mode,
+			MTK_WDT_CLR_STATUS, MTK_WDT_CLR_STATUS_VAL);
+}