ftwd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause
    3  *
    4  * Copyright (c) 2020 Poul-Henning Kamp
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/module.h>
   36 #include <sys/rman.h>
   37 #include <sys/systm.h>
   38 #include <sys/watchdog.h>
   39 
   40 #include <dev/superio/superio.h>
   41 
   42 #include <machine/bus.h>
   43 #include <machine/resource.h>
   44 
   45 struct ftwd_softc {
   46         eventhandler_tag        wd_ev;
   47 };
   48 
   49 static void
   50 ftwd_func(void *priv, u_int cmd, int *error)
   51 {
   52         device_t dev = priv;
   53         uint64_t timeout;
   54         uint8_t val = 0;
   55         uint8_t minutes = 0;
   56 
   57         if (cmd != 0) {
   58                 cmd &= WD_INTERVAL;
   59 
   60                 /* Convert the requested timeout to seconds. */
   61                 if (cmd >= WD_TO_1SEC)
   62                         timeout = (uint64_t)1 << (cmd - WD_TO_1SEC);
   63                 else
   64                         timeout = 1;
   65 
   66                 if (timeout <= UINT8_MAX) {
   67                         val = timeout;
   68                         *error = 0;
   69                 } else if ((timeout / 60) <= UINT8_MAX) {
   70                         val = timeout / 60;
   71                         minutes = 1;
   72                         *error = 0;
   73                 }
   74         }
   75         if (bootverbose) {
   76                 if (val == 0) {
   77                         device_printf(dev, "disabling watchdog\n");
   78                 } else {
   79                         device_printf(dev,
   80                             "arm watchdog to %d %s%s (Was: 0x%02x)\n",
   81                             val, minutes ? "minute" : "second",
   82                             val == 1 ? "" : "s",
   83                             superio_read(dev, 0xf6)
   84                         );
   85                 }
   86         }
   87         superio_write(dev, 0xf0, 0x00);         // Disable WDTRST#
   88         superio_write(dev, 0xf6, val);          // Set Counter
   89 
   90         if (minutes)
   91                 superio_write(dev, 0xf5, 0x7d); // minutes, act high, 125ms
   92         else
   93                 superio_write(dev, 0xf5, 0x75); // seconds, act high, 125ms
   94 
   95         if (val)
   96                 superio_write(dev, 0xf7, 0x01); // Disable PME
   97         if (val)
   98                 superio_write(dev, 0xf0, 0x81); // Enable WDTRST#
   99         else
  100                 superio_write(dev, 0xf0, 0x00); // Disable WDTRST
  101 }
  102 
  103 static int
  104 ftwd_probe(device_t dev)
  105 {
  106 
  107         if (superio_vendor(dev) != SUPERIO_VENDOR_FINTEK ||
  108             superio_get_type(dev) != SUPERIO_DEV_WDT)
  109                 return (ENXIO);
  110         device_set_desc(dev, "Watchdog Timer on Fintek SuperIO");
  111         return (BUS_PROBE_DEFAULT);
  112 }
  113 
  114 static int
  115 ftwd_attach(device_t dev)
  116 {
  117         struct ftwd_softc *sc = device_get_softc(dev);
  118 
  119         /*
  120          * We do not touch the watchdog at this time, it might be armed
  121          * by firmware to protect the full boot sequence.
  122          */
  123 
  124         sc->wd_ev = EVENTHANDLER_REGISTER(watchdog_list, ftwd_func, dev, 0);
  125         return (0);
  126 }
  127 
  128 static int
  129 ftwd_detach(device_t dev)
  130 {
  131         struct ftwd_softc *sc = device_get_softc(dev);
  132         int dummy;
  133 
  134         if (sc->wd_ev != NULL)
  135                 EVENTHANDLER_DEREGISTER(watchdog_list, sc->wd_ev);
  136         ftwd_func(dev, 0, &dummy);
  137         return (0);
  138 }
  139 
  140 static device_method_t ftwd_methods[] = {
  141         DEVMETHOD(device_probe,         ftwd_probe),
  142         DEVMETHOD(device_attach,        ftwd_attach),
  143         DEVMETHOD(device_detach,        ftwd_detach),
  144         { 0, 0 }
  145 };
  146 
  147 static driver_t ftwd_driver = {
  148         "ftwd",
  149         ftwd_methods,
  150         sizeof (struct ftwd_softc)
  151 };
  152 
  153 DRIVER_MODULE(ftwd, superio, ftwd_driver, NULL, NULL);
  154 MODULE_DEPEND(ftwd, superio, 1, 1, 1);
  155 MODULE_VERSION(ftwd, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/ftwd/ftwd.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ftwd/ftwd.c