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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Poul-Henning Kamp
*
* 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/kernel.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <sys/watchdog.h>
#include <dev/superio/superio.h>
#include <machine/bus.h>
#include <machine/resource.h>
struct ftwd_softc {
eventhandler_tag wd_ev;
};
static void
ftwd_func(void *priv, u_int cmd, int *error)
{
device_t dev = priv;
uint64_t timeout;
uint8_t val = 0;
uint8_t minutes = 0;
if (cmd != 0) {
cmd &= WD_INTERVAL;
/* Convert the requested timeout to seconds. */
if (cmd >= WD_TO_1SEC)
timeout = (uint64_t)1 << (cmd - WD_TO_1SEC);
else
timeout = 1;
if (timeout <= UINT8_MAX) {
val = timeout;
*error = 0;
} else if ((timeout / 60) <= UINT8_MAX) {
val = timeout / 60;
minutes = 1;
*error = 0;
}
}
if (bootverbose) {
if (val == 0) {
device_printf(dev, "disabling watchdog\n");
} else {
device_printf(dev,
"arm watchdog to %d %s%s (Was: 0x%02x)\n",
val, minutes ? "minute" : "second",
val == 1 ? "" : "s",
superio_read(dev, 0xf6)
);
}
}
superio_write(dev, 0xf0, 0x00); // Disable WDTRST#
superio_write(dev, 0xf6, val); // Set Counter
if (minutes)
superio_write(dev, 0xf5, 0x7d); // minutes, act high, 125ms
else
superio_write(dev, 0xf5, 0x75); // seconds, act high, 125ms
if (val)
superio_write(dev, 0xf7, 0x01); // Disable PME
if (val)
superio_write(dev, 0xf0, 0x81); // Enable WDTRST#
else
superio_write(dev, 0xf0, 0x00); // Disable WDTRST
}
static int
ftwd_probe(device_t dev)
{
if (superio_vendor(dev) != SUPERIO_VENDOR_FINTEK ||
superio_get_type(dev) != SUPERIO_DEV_WDT)
return (ENXIO);
device_set_desc(dev, "Watchdog Timer on Fintek SuperIO");
return (BUS_PROBE_DEFAULT);
}
static int
ftwd_attach(device_t dev)
{
struct ftwd_softc *sc = device_get_softc(dev);
/*
* We do not touch the watchdog at this time, it might be armed
* by firmware to protect the full boot sequence.
*/
sc->wd_ev = EVENTHANDLER_REGISTER(watchdog_list, ftwd_func, dev, 0);
return (0);
}
static int
ftwd_detach(device_t dev)
{
struct ftwd_softc *sc = device_get_softc(dev);
int dummy;
if (sc->wd_ev != NULL)
EVENTHANDLER_DEREGISTER(watchdog_list, sc->wd_ev);
ftwd_func(dev, 0, &dummy);
return (0);
}
static device_method_t ftwd_methods[] = {
DEVMETHOD(device_probe, ftwd_probe),
DEVMETHOD(device_attach, ftwd_attach),
DEVMETHOD(device_detach, ftwd_detach),
{ 0, 0 }
};
static driver_t ftwd_driver = {
"ftwd",
ftwd_methods,
sizeof (struct ftwd_softc)
};
DRIVER_MODULE(ftwd, superio, ftwd_driver, NULL, NULL);
MODULE_DEPEND(ftwd, superio, 1, 1, 1);
MODULE_VERSION(ftwd, 1);
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