157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/*-
|
|
* 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/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 debug;
|
|
};
|
|
|
|
static void
|
|
ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
|
|
{
|
|
struct ar71xx_wdog_softc *sc = private;
|
|
uint64_t timer_val;
|
|
|
|
cmd &= WD_INTERVAL;
|
|
if (sc->debug)
|
|
device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: cmd: %x\n", cmd);
|
|
if (cmd > 0) {
|
|
timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
|
|
1000000000;
|
|
if (sc->debug)
|
|
device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
|
|
/*
|
|
* Load timer with large enough value to prevent spurious
|
|
* reset
|
|
*/
|
|
ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
|
|
ar71xx_ahb_freq() * 10);
|
|
ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
|
|
RST_WDOG_ACTION_RESET);
|
|
ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
|
|
(timer_val & 0xffffffff));
|
|
sc->armed = 1;
|
|
*error = 0;
|
|
} else {
|
|
if (sc->debug)
|
|
device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: disarming\n");
|
|
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,
|
|
"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);
|