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