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Index: sys/arm64/rockchip/clk/rk3399_cru.c
===================================================================
--- sys/arm64/rockchip/clk/rk3399_cru.c
+++ sys/arm64/rockchip/clk/rk3399_cru.c
@@ -1211,6 +1211,7 @@
106),
FRACT(DCLK_VOP1_FRAC, "dclk_vop1_frac", "dclk_vop1_div", 0,
107),
+ FRACT(PCLK_WDT, "pclk_wdt", "pclk_alive", 1, 1),
/* Not yet implemented yet
* MMC(SCLK_SDMMC_DRV, "sdmmc_drv", "clk_sdmmc", RK3399_SDMMC_CON0, 1),
Index: sys/dev/dwwdt/dwwdt.c
===================================================================
--- sys/dev/dwwdt/dwwdt.c
+++ sys/dev/dwwdt/dwwdt.c
@@ -0,0 +1,377 @@
+/*-
+ * Copyright (c) 2020 BusyTech
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#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
+
+/* Useful macros */
+#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))
+
+
+/*
+ * DWWDT has 16 different timeout periods here, however FreeBSD interface
+ * provides only 12 possible values. Let map it here.
+ */
+
+static const uint32_t dwwdt_timeout_vals[] = {
+ [WD_TO_1MS] = 0x0000, /* Actually this is 60ms. */
+ [WD_TO_125MS] = 0x0001,
+ [WD_TO_250MS] = 0x0002,
+ [WD_TO_500MS] = 0x0003,
+ [WD_TO_1SEC] = 0x0004,
+ [WD_TO_2SEC] = 0x0005,
+ [WD_TO_4SEC] = 0x0006,
+ [WD_TO_8SEC] = 0x0007,
+ [WD_TO_16SEC] = 0x0008,
+ [WD_TO_32SEC] = 0x0009,
+ [WD_TO_64SEC] = 0x000A,
+ [WD_TO_128SEC] = 0x000B,
+ [WD_TO_128SEC + 1] = 0x000C,
+ [WD_TO_128SEC + 2] = 0x000D,
+ [WD_TO_128SEC + 3] = 0x000E,
+ [WD_TO_128SEC + 4] = 0x000F,
+
+ /* Anything above cannot be set. */
+};
+
+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;
+};
+
+
+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 bool dwwdt_stop(const struct dwwdt_softc *sc);
+static inline void dwwdt_start(const struct dwwdt_softc *sc);
+static inline bool dwwdt_started(const struct dwwdt_softc *sc);
+static inline void dwwdt_kick(const struct dwwdt_softc *sc);
+
+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, " EOI: %08x\n", DWWDT_READ4(sc, DWWDT_EOI));
+
+ 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)
+{
+
+ return ((DWWDT_READ4(sc, DWWDT_CR) & DWWDT_CR_WDT_EN) != 0);
+}
+
+static inline bool
+dwwdt_stop(const struct dwwdt_softc *sc)
+{
+ uint32_t val;
+
+ /* Disable watchdog, disable interrupts. */
+ val = DWWDT_READ4(sc, DWWDT_CR);
+ val &= ~(DWWDT_CR_WDT_EN | DWWDT_CR_RESP_MODE);
+ DWWDT_WRITE4(sc, DWWDT_CR, val);
+
+ /*
+ * Documentation says only system reset can stop watchdog. In any way
+ * we still can check we affected flag.
+ */
+ return (!dwwdt_started(sc));
+}
+
+static void inline
+dwwdt_start(const 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);
+}
+
+static void inline
+dwwdt_kick(const struct dwwdt_softc *sc)
+{
+
+ 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?"));
+
+ /* Confirm interrupt reception. */
+ (void)DWWDT_READ4(sc, DWWDT_EOI);
+
+ if (dwwdt_prevent_restart != 0) {
+ /* Kick watchdog here if restart is prevented. */
+ dwwdt_kick(sc);
+ }
+}
+
+static void
+dwwdt_event(void *arg, unsigned int cmd, int *error)
+{
+ const struct dwwdt_softc *sc = arg;
+ uint32_t timeout;
+ uint32_t val;
+ bool stopped;
+
+ /*
+ * Try to stop watchdog. It may (surely) fail, but give it the chance.
+ */
+ timeout = cmd & WD_INTERVAL;
+
+ stopped = dwwdt_stop(sc);
+ if (cmd == 0) {
+ if (!stopped)
+ *error = EOPNOTSUPP;
+ return;
+ }
+
+ if (timeout > WD_TO_128SEC || timeout == WD_TO_NEVER)
+ return;
+
+ val = dwwdt_timeout_vals[timeout];
+ /* Set timeout. */
+ DWWDT_WRITE4(sc, DWWDT_TORR, val);
+
+ /* Enable watchdog */
+ dwwdt_start(sc);
+
+ /* Kick it. */
+ dwwdt_kick(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_get_freq(sc->sc_clk, &sc->sc_clk_freq) != 0) {
+ device_printf(dev, "cannot get clock frequency\n");
+ goto err_no_freq;
+ }
+
+ /* Just out of curious. */
+ if (dwwdt_debug_enabled != 0)
+ dwwdt_debug(dev);
+
+ sc->sc_evtag = EVENTHANDLER_REGISTER(watchdog_list, dwwdt_event, sc, 0);
+ 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;
+
+ sc = device_get_softc(dev);
+ if (dwwdt_started(sc))
+ 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;
+
+ /* Set also maximum timeout. Just for case. */
+ DWWDT_WRITE4(sc, DWWDT_TORR, 0x000F);
+ dwwdt_kick(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);
Index: sys/modules/Makefile
===================================================================
--- sys/modules/Makefile
+++ sys/modules/Makefile
@@ -106,6 +106,7 @@
dcons_crom \
${_dpms} \
dummynet \
+ dwwdt \
${_efirt} \
${_em} \
${_ena} \
Index: sys/modules/dwwdt/Makefile
===================================================================
--- sys/modules/dwwdt/Makefile
+++ 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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