2 files changed, 91 insertions, 0 deletions
diff --git a/plat/intel/soc/common/drivers/wdt/watchdog.c b/plat/intel/soc/common/drivers/wdt/watchdog.c
new file mode 100644
index 0000000..651189b
--- /dev/null
+++ b/plat/intel/soc/common/drivers/wdt/watchdog.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019, Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <lib/mmio.h>
+
+#include "watchdog.h"
+
+
+/* Reset watchdog timer */
+void watchdog_sw_rst(void)
+{
+	mmio_write_32(WDT_CRR, WDT_SW_RST);
+}
+
+/* Print component information */
+void watchdog_info(void)
+{
+	INFO("Component Type    : %x\r\n", mmio_read_32(WDT_COMP_VERSION));
+	INFO("Component Version : %x\r\n", mmio_read_32(WDT_COMP_TYPE));
+}
+
+/* Check watchdog current status */
+void watchdog_status(void)
+{
+	if (mmio_read_32(WDT_CR) & 1) {
+		INFO("Watchdog Timer is currently enabled\n");
+		INFO("Current Counter : 0x%x\r\n", mmio_read_32(WDT_CCVR));
+	} else {
+		INFO("Watchdog Timer is currently disabled\n");
+	}
+}
+
+/* Initialize & enable watchdog */
+void watchdog_init(int watchdog_clk)
+{
+	uint8_t cycles_i = 0;
+	uint32_t wdt_cycles = WDT_MIN_CYCLES;
+	uint32_t top_init_cycles = WDT_PERIOD * watchdog_clk;
+
+	while ((cycles_i < 15) && (wdt_cycles < top_init_cycles)) {
+		wdt_cycles = (wdt_cycles << 1);
+		cycles_i++;
+	}
+
+	mmio_write_32(WDT_TORR, (cycles_i << 4) | cycles_i);
+
+	mmio_write_32(WDT_CR, WDT_CR_RMOD|WDT_CR_EN);
+}
diff --git a/plat/intel/soc/common/drivers/wdt/watchdog.h b/plat/intel/soc/common/drivers/wdt/watchdog.h
new file mode 100644
index 0000000..2c72463
--- /dev/null
+++ b/plat/intel/soc/common/drivers/wdt/watchdog.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2019, Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CAD_WATCHDOG_H
+#define CAD_WATCHDOG_H
+
+#define WDT_BASE			(0xFFD00200)
+#define WDT_REG_SIZE_OFFSET		(0x4)
+#define WDT_MIN_CYCLES			(65536)
+#define WDT_PERIOD			(20)
+
+#define WDT_CR				(WDT_BASE + 0x0)
+#define WDT_TORR			(WDT_BASE + 0x4)
+
+#define WDT_CRR				(WDT_BASE + 0xC)
+
+#define WDT_CCVR			(WDT_BASE + 0x8)
+#define WDT_STAT			(WDT_BASE + 0x10)
+#define WDT_EOI				(WDT_BASE + 0x14)
+
+#define WDT_COMP_PARAM_1		(WDT_BASE + 0xF4)
+#define WDT_COMP_VERSION		(WDT_BASE + 0xF8)
+#define WDT_COMP_TYPE			(WDT_BASE + 0XFC)
+
+#define WDT_CR_RMOD			(0x0)
+#define WDT_CR_EN			(0x1)
+
+#define WDT_SW_RST			(0x76)
+
+
+void watchdog_init(int watchdog_clk);
+void watchdog_info(void);
+void watchdog_status(void);
+void watchdog_sw_rst(void);
+
+#endif