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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
* All rights reserved.
*
* 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 unmodified, 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.
*/
/*
* Watchdog driver for AR71xx
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/systm.h>
#include <sys/watchdog.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <mips/atheros/ar71xxreg.h>
#include <mips/atheros/ar71xx_cpudef.h>
struct ar71xx_wdog_softc {
device_t dev;
int armed;
int reboot_from_watchdog;
int watchdog_nmi;
int debug;
};
static void
ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
{
struct ar71xx_wdog_softc *sc = private;
uint64_t timer_val;
int action;
action = RST_WDOG_ACTION_RESET;
if (sc->watchdog_nmi != 0)
action = RST_WDOG_ACTION_NMI;
cmd &= WD_INTERVAL;
if (sc->debug)
device_printf(sc->dev, "%s: : cmd: %x\n", __func__, cmd);
if (cmd > 0) {
timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
1000000000;
/*
* Clamp the timer value in case we overflow.
*/
if (timer_val > 0xffffffff)
timer_val = 0xffffffff;
if (sc->debug)
device_printf(sc->dev, "%s: programming timer: %jx\n",
__func__, (uintmax_t) timer_val);
/*
* Make sure the watchdog is set to NOACTION and give it
* time to take.
*/
ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
wmb();
DELAY(100);
/*
* Update the timer value. It's already clamped at this
* point so we don't have to wrap/clamp it here.
*/
ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER, timer_val);
wmb();
DELAY(100);
/*
* And now, arm.
*/
ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, action);
sc->armed = 1;
*error = 0;
} else {
if (sc->debug)
device_printf(sc->dev, "%s: disarming\n", __func__);
if (sc->armed) {
ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
RST_WDOG_ACTION_NOACTION);
sc->armed = 0;
}
}
}
static int
ar71xx_wdog_probe(device_t dev)
{
device_set_desc(dev, "Atheros AR71XX watchdog timer");
return (BUS_PROBE_NOWILDCARD);
}
static void
ar71xx_wdog_sysctl(device_t dev)
{
struct ar71xx_wdog_softc *sc = device_get_softc(dev);
struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"debug", CTLFLAG_RW, &sc->debug, 0,
"enable watchdog debugging");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"nmi", CTLFLAG_RW, &sc->watchdog_nmi, 0,
"watchdog triggers NMI instead of reset");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"armed", CTLFLAG_RD, &sc->armed, 0,
"whether the watchdog is armed");
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
"whether the system rebooted from the watchdog");
}
static int
ar71xx_wdog_attach(device_t dev)
{
struct ar71xx_wdog_softc *sc = device_get_softc(dev);
/* Initialise */
sc->reboot_from_watchdog = 0;
sc->armed = 0;
sc->debug = 0;
if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST) {
device_printf (dev,
"Previous reset was due to watchdog timeout\n");
sc->reboot_from_watchdog = 1;
}
ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
sc->dev = dev;
EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
ar71xx_wdog_sysctl(dev);
return (0);
}
static device_method_t ar71xx_wdog_methods[] = {
DEVMETHOD(device_probe, ar71xx_wdog_probe),
DEVMETHOD(device_attach, ar71xx_wdog_attach),
{0, 0},
};
static driver_t ar71xx_wdog_driver = {
"ar71xx_wdog",
ar71xx_wdog_methods,
sizeof(struct ar71xx_wdog_softc),
};
static devclass_t ar71xx_wdog_devclass;
DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);
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