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diff --git a/sys/dev/dwwdt/dwwdt.c b/sys/dev/dwwdt/dwwdt.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/dwwdt/dwwdt.c
@@ -0,0 +1,360 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 BusyTech
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/types.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/rman.h>
+#include <sys/resource.h>
+#include <sys/watchdog.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/extres/clk/clk.h>
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+/* Registers */
+#define DWWDT_CR 0x00
+#define DWWDT_CR_WDT_EN (1 << 0)
+#define DWWDT_CR_RESP_MODE (1 << 1)
+#define DWWDT_TORR 0x04
+#define DWWDT_CCVR 0x08
+#define DWWDT_CRR 0x0C
+#define DWWDT_CRR_KICK 0x76
+#define DWWDT_STAT 0x10
+#define DWWDT_STAT_STATUS 0x01
+#define DWWDT_EOI 0x14
+
+#define DWWDT_READ4(sc, reg) bus_read_4((sc)->sc_mem_res, (reg))
+#define DWWDT_WRITE4(sc, reg, val) \
+ bus_write_4((sc)->sc_mem_res, (reg), (val))
+
+/*
+ * 47 = 16 (timeout shift of dwwdt) + 30 (1s ~= 2 ** 30ns) + 1
+ * (pre-restart delay)
+ */
+#define DWWDT_EXP_OFFSET 47
+
+struct dwwdt_softc {
+ device_t sc_dev;
+ struct resource *sc_mem_res;
+ struct resource *sc_irq_res;
+ void *sc_intr_cookie;
+ clk_t sc_clk;
+ uint64_t sc_clk_freq;
+ eventhandler_tag sc_evtag;
+ int sc_mem_rid;
+ int sc_irq_rid;
+ enum {
+ DWWDT_STOPPED,
+ DWWDT_RUNNING,
+ } sc_status;
+};
+
+static devclass_t dwwdt_devclass;
+
+SYSCTL_NODE(_dev, OID_AUTO, dwwdt, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "Synopsys Designware watchdog timer");
+/* Setting this to 0 enables full restart mode. */
+static uint32_t dwwdt_prevent_restart = 1;
+SYSCTL_UINT(_dev_dwwdt, OID_AUTO, prevent_restart, CTLFLAG_RW | CTLFLAG_MPSAFE,
+ &dwwdt_prevent_restart, 1,
+ "Prevent system restart (0 - Disabled; 1 - Enabled)");
+
+static uint32_t dwwdt_debug_enabled = 0;
+SYSCTL_UINT(_dev_dwwdt, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_MPSAFE,
+ &dwwdt_debug_enabled, 1, "Debug mode (0 - Disabled; 1 - Enabled)");
+
+static int dwwdt_probe(device_t);
+static int dwwdt_attach(device_t);
+static int dwwdt_detach(device_t);
+static int dwwdt_shutdown(device_t);
+
+static void dwwdt_intr(void *);
+static void dwwdt_event(void *, unsigned int, int *);
+
+/* Helpers */
+static inline void dwwdt_start(struct dwwdt_softc *sc);
+static inline bool dwwdt_started(const struct dwwdt_softc *sc);
+static inline void dwwdt_stop(struct dwwdt_softc *sc);
+static inline void dwwdt_set_timeout(const struct dwwdt_softc *sc, int val);
+
+static void dwwdt_debug(device_t);
+
+static void
+dwwdt_debug(device_t dev)
+{
+ /*
+ * Reading from EOI may clear interrupt flag.
+ */
+ const struct dwwdt_softc *sc = device_get_softc(dev);
+
+ device_printf(dev, "Registers dump: \n");
+ device_printf(dev, " CR: %08x\n", DWWDT_READ4(sc, DWWDT_CR));
+ device_printf(dev, " CCVR: %08x\n", DWWDT_READ4(sc, DWWDT_CCVR));
+ device_printf(dev, " CRR: %08x\n", DWWDT_READ4(sc, DWWDT_CRR));
+ device_printf(dev, " STAT: %08x\n", DWWDT_READ4(sc, DWWDT_STAT));
+
+ device_printf(dev, "Clock: %s\n", clk_get_name(sc->sc_clk));
+ device_printf(dev, " FREQ: %lu\n", sc->sc_clk_freq);
+}
+
+static inline bool
+dwwdt_started(const struct dwwdt_softc *sc)
+{
+
+ /* CR_WDT_E bit can be clear only by full CPU reset. */
+ return ((DWWDT_READ4(sc, DWWDT_CR) & DWWDT_CR_WDT_EN) != 0);
+}
+
+static void inline
+dwwdt_start(struct dwwdt_softc *sc)
+{
+ uint32_t val;
+
+ /* Enable watchdog */
+ val = DWWDT_READ4(sc, DWWDT_CR);
+ val |= DWWDT_CR_WDT_EN | DWWDT_CR_RESP_MODE;
+ DWWDT_WRITE4(sc, DWWDT_CR, val);
+ sc->sc_status = DWWDT_RUNNING;
+}
+
+static void inline
+dwwdt_stop(struct dwwdt_softc *sc)
+{
+
+ sc->sc_status = DWWDT_STOPPED;
+ dwwdt_set_timeout(sc, 0x0f);
+}
+
+static void inline
+dwwdt_set_timeout(const struct dwwdt_softc *sc, int val)
+{
+
+ DWWDT_WRITE4(sc, DWWDT_TORR, val);
+ DWWDT_WRITE4(sc, DWWDT_CRR, DWWDT_CRR_KICK);
+}
+
+static void
+dwwdt_intr(void *arg)
+{
+ struct dwwdt_softc *sc = arg;
+
+ KASSERT((DWWDT_READ4(sc, DWWDT_STAT) & DWWDT_STAT_STATUS) != 0,
+ ("Missing interrupt status bit?"));
+
+ if (dwwdt_prevent_restart != 0 || sc->sc_status == DWWDT_STOPPED) {
+ /*
+ * Confirm interrupt reception. Restart counter.
+ * This also emulates stopping watchdog.
+ */
+ (void)DWWDT_READ4(sc, DWWDT_EOI);
+ }
+}
+
+static void
+dwwdt_event(void *arg, unsigned int cmd, int *error)
+{
+ struct dwwdt_softc *sc = arg;
+ const int exponent = flsl(sc->sc_clk_freq);
+ int timeout;
+ int val;
+
+ timeout = cmd & WD_INTERVAL;
+ val = MAX(0, timeout + exponent - DWWDT_EXP_OFFSET);
+
+ dwwdt_stop(sc);
+ if (cmd == 0 || val > 0x0f) {
+ /*
+ * Set maximum time between interrupts and Leave watchdog
+ * disabled.
+ */
+ return;
+ }
+
+ dwwdt_set_timeout(sc, val);
+ dwwdt_start(sc);
+ *error = 0;
+
+ if (dwwdt_debug_enabled)
+ dwwdt_debug(sc->sc_dev);
+}
+
+static int
+dwwdt_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "snps,dw-wdt"))
+ return (ENXIO);
+
+ device_set_desc(dev, "Synopsys Designware watchdog timer");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+dwwdt_attach(device_t dev)
+{
+ struct dwwdt_softc *sc;
+
+ sc = device_get_softc(dev);
+ sc->sc_dev = dev;
+
+ sc->sc_mem_rid = 0;
+ sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+ &sc->sc_mem_rid, RF_ACTIVE);
+ if (sc->sc_mem_res == NULL) {
+ device_printf(dev, "cannot allocate memory resource\n");
+ goto err_no_mem;
+ }
+
+ sc->sc_irq_rid = 0;
+ sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
+ &sc->sc_irq_rid, RF_ACTIVE);
+ if (sc->sc_irq_res == NULL) {
+ device_printf(dev, "cannot allocate ireq resource\n");
+ goto err_no_irq;
+ }
+
+ sc->sc_intr_cookie = NULL;
+ if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
+ NULL, dwwdt_intr, sc, &sc->sc_intr_cookie) != 0) {
+ device_printf(dev, "cannot setup interrupt routine\n");
+ goto err_no_intr;
+ }
+
+ if (clk_get_by_ofw_index(dev, 0, 0, &sc->sc_clk) != 0) {
+ device_printf(dev, "cannot find clock\n");
+ goto err_no_clock;
+ }
+
+ if (clk_enable(sc->sc_clk) != 0) {
+ device_printf(dev, "cannot enable clock\n");
+ goto err_no_freq;
+ }
+
+ if (clk_get_freq(sc->sc_clk, &sc->sc_clk_freq) != 0) {
+ device_printf(dev, "cannot get clock frequency\n");
+ goto err_no_freq;
+ }
+
+ if (sc->sc_clk_freq == 0UL)
+ goto err_no_freq;
+
+ sc->sc_evtag = EVENTHANDLER_REGISTER(watchdog_list, dwwdt_event, sc, 0);
+ sc->sc_status = DWWDT_STOPPED;
+
+ return (bus_generic_attach(dev));
+
+err_no_freq:
+ clk_release(sc->sc_clk);
+err_no_clock:
+ bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_cookie);
+err_no_intr:
+ bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid, sc->sc_irq_res);
+err_no_irq:
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid,
+ sc->sc_mem_res);
+err_no_mem:
+ return (ENXIO);
+}
+
+static int
+dwwdt_detach(device_t dev)
+{
+ struct dwwdt_softc *sc = device_get_softc(dev);
+
+ if (dwwdt_started(sc)) {
+ /*
+ * Once started it cannot be stopped. Prevent module unload
+ * instead.
+ */
+ return (EBUSY);
+ }
+
+ EVENTHANDLER_DEREGISTER(watchdog_list, sc->sc_evtag);
+ sc->sc_evtag = NULL;
+
+ if (sc->sc_clk != NULL)
+ clk_release(sc->sc_clk);
+
+ if (sc->sc_intr_cookie != NULL)
+ bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_cookie);
+
+ if (sc->sc_irq_res) {
+ bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid,
+ sc->sc_irq_res);
+ }
+
+ if (sc->sc_mem_res) {
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid,
+ sc->sc_mem_res);
+ }
+
+ return (bus_generic_detach(dev));
+}
+
+static int
+dwwdt_shutdown(device_t dev)
+{
+ struct dwwdt_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ /* Prevent restarts during shutdown. */
+ dwwdt_prevent_restart = 1;
+ dwwdt_stop(sc);
+ return (bus_generic_shutdown(dev));
+}
+
+static device_method_t dwwdt_methods[] = {
+ DEVMETHOD(device_probe, dwwdt_probe),
+ DEVMETHOD(device_attach, dwwdt_attach),
+ DEVMETHOD(device_detach, dwwdt_detach),
+ DEVMETHOD(device_shutdown, dwwdt_shutdown),
+
+ {0, 0}
+};
+
+static driver_t dwwdt_driver = {
+ "dwwdt",
+ dwwdt_methods,
+ sizeof(struct dwwdt_softc),
+};
+
+DRIVER_MODULE(dwwdt, simplebus, dwwdt_driver, dwwdt_devclass, NULL, NULL);
+MODULE_VERSION(dwwdt, 1);
diff --git a/sys/modules/Makefile b/sys/modules/Makefile
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -108,6 +108,7 @@
${_dpdk_lpm6} \
${_dpms} \
dummynet \
+ ${_dwwdt} \
${_efirt} \
${_em} \
${_ena} \
@@ -611,6 +612,7 @@
.if ${MACHINE_CPUARCH} == "aarch64"
_allwinner= allwinner
_armv8crypto= armv8crypto
+_dwwdt= dwwdt
_em= em
_rockchip= rockchip
.endif
diff --git a/sys/modules/dwwdt/Makefile b/sys/modules/dwwdt/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/dwwdt/Makefile
@@ -0,0 +1,7 @@
+.PATH: ${SRCTOP}/sys/dev/dwwdt
+
+KMOD = dwwdt
+SRCS = dwwdt.c \
+ device_if.h bus_if.h ofw_bus_if.h
+
+.include<bsd.kmod.mk>

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