7bc1af9566
* Add some per-device sysctl entries which record the watchdog state - whether it is armed; whether the last reboot was due to the watchdog. * Add a per-device sysctl debug flag to enable logging watchdog arming/ disarming. Reviewed by: gonzo@
156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/*-
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* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Watchdog driver for AR71xx
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/watchdog.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <mips/atheros/ar71xxreg.h>
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struct ar71xx_wdog_softc {
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device_t dev;
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int armed;
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int reboot_from_watchdog;
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int debug;
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};
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static void
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ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct ar71xx_wdog_softc *sc = private;
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uint64_t timer_val;
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cmd &= WD_INTERVAL;
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if (sc->debug)
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device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: cmd: %x\n", cmd);
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if (cmd > 0) {
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timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
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1000000000;
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if (sc->debug)
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device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
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/*
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* Load timer with large enough value to prevent spurious
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* reset
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*/
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ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
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ar71xx_ahb_freq() * 10);
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ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
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RST_WDOG_ACTION_RESET);
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ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
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(timer_val & 0xffffffff));
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sc->armed = 1;
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*error = 0;
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} else {
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if (sc->debug)
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device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: disarming\n");
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if (sc->armed) {
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ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
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RST_WDOG_ACTION_NOACTION);
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sc->armed = 0;
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}
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}
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}
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static int
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ar71xx_wdog_probe(device_t dev)
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{
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device_set_desc(dev, "Atheros AR71XX watchdog timer");
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return (0);
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}
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static void
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ar71xx_wdog_sysctl(device_t dev)
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{
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struct ar71xx_wdog_softc *sc = device_get_softc(dev);
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struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
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struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"debug", CTLFLAG_RW, &sc->debug, 0,
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"enable watchdog debugging");
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"armed", CTLFLAG_RD, &sc->armed, 0,
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"whether the watchdog is armed");
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
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"whether the system rebooted from the watchdog");
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}
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static int
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ar71xx_wdog_attach(device_t dev)
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{
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struct ar71xx_wdog_softc *sc = device_get_softc(dev);
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/* Initialise */
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sc->reboot_from_watchdog = 0;
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sc->armed = 0;
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sc->debug = 0;
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if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST) {
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device_printf (dev,
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"Previous reset was due to watchdog timeout\n");
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sc->reboot_from_watchdog = 1;
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}
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ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
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sc->dev = dev;
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EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
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ar71xx_wdog_sysctl(dev);
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return (0);
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}
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static device_method_t ar71xx_wdog_methods[] = {
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DEVMETHOD(device_probe, ar71xx_wdog_probe),
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DEVMETHOD(device_attach, ar71xx_wdog_attach),
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{0, 0},
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};
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static driver_t ar71xx_wdog_driver = {
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"ar71xx_wdog",
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ar71xx_wdog_methods,
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sizeof(struct ar71xx_wdog_softc),
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};
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static devclass_t ar71xx_wdog_devclass;
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DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);
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