The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/i8134x/i80321_wdog.c

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    1 /*      $NetBSD: i80321_wdog.c,v 1.6 2003/07/15 00:24:54 lukem Exp $    */
    2 
    3 /*-
    4  * Copyright (c) 2005 Olivier Houchard
    5  * Copyright (c) 2002 Wasabi Systems, Inc.
    6  * All rights reserved.
    7  *
    8  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed for the NetBSD Project by
   21  *      Wasabi Systems, Inc.
   22  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   23  *    or promote products derived from this software without specific prior
   24  *    written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * Watchdog timer support for the Intel i80321 I/O processor.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/11.0/sys/arm/xscale/i8134x/i80321_wdog.c 295199 2016-02-03 08:59:12Z mmel $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/watchdog.h>
   49 #include <sys/bus.h>
   50 #include <sys/kernel.h>
   51 #include <sys/module.h>
   52 
   53 #include <machine/bus.h>
   54 #include <machine/cpufunc.h>
   55 #include <machine/machdep.h>
   56 
   57 #include <arm/xscale/i8134x/i80321reg.h>
   58 #include <arm/xscale/i8134x/i80321var.h>
   59 
   60 
   61 struct iopwdog_softc {
   62         device_t dev;
   63         int armed;
   64         int wdog_period;
   65 };
   66 
   67 static __inline void
   68 wdtcr_write(uint32_t val)
   69 {
   70 
   71 #ifdef CPU_XSCALE_81342
   72         __asm __volatile("mcr p6, 0, %0, c7, c9, 0"
   73 #else
   74         __asm __volatile("mcr p6, 0, %0, c7, c1, 0"
   75 #endif
   76                 :
   77                 : "r" (val));
   78 }
   79 
   80 static void
   81 iopwdog_tickle(void *arg)
   82 {
   83         struct iopwdog_softc *sc = arg;
   84 
   85         if (!sc->armed)
   86                 return;
   87         wdtcr_write(WDTCR_ENABLE1);
   88         wdtcr_write(WDTCR_ENABLE2);
   89 }
   90 
   91 static int
   92 iopwdog_probe(device_t dev)
   93 {
   94         struct iopwdog_softc *sc = device_get_softc(dev);
   95         char buf[128];
   96 
   97         /*
   98          * XXX Should compute the period based on processor speed.
   99          * For a 600MHz XScale core, the wdog must be tickled approx.
  100          * every 7 seconds.
  101          */
  102 
  103         sc->wdog_period = 7;
  104         sprintf(buf, "i80321 Watchdog, must be tickled every %d seconds",
  105             sc->wdog_period);
  106         device_set_desc_copy(dev, buf);
  107 
  108         return (0);
  109 }
  110 
  111 static void
  112 iopwdog_watchdog_fn(void *private, u_int cmd, int *error)
  113 {
  114         struct iopwdog_softc *sc = private;
  115 
  116         cmd &= WD_INTERVAL;
  117         if (cmd > 0 && cmd <= 63
  118             && (uint64_t)1<<cmd <= (uint64_t)sc->wdog_period * 1000000000) {
  119                 /* Valid value -> Enable watchdog */
  120                 iopwdog_tickle(sc);
  121                 sc->armed = 1;
  122                 *error = 0;
  123         } else {
  124                 /* Can't disable this watchdog! */
  125                 if (sc->armed)
  126                         *error = EOPNOTSUPP;
  127         }
  128 }
  129 
  130 static int
  131 iopwdog_attach(device_t dev)
  132 {
  133         struct iopwdog_softc *sc = device_get_softc(dev);
  134         
  135         sc->dev = dev;
  136         sc->armed = 0;
  137         EVENTHANDLER_REGISTER(watchdog_list, iopwdog_watchdog_fn, sc, 0);
  138         return (0);
  139 }
  140 
  141 static device_method_t iopwdog_methods[] = {
  142         DEVMETHOD(device_probe, iopwdog_probe),
  143         DEVMETHOD(device_attach, iopwdog_attach),
  144         {0, 0},
  145 };
  146 
  147 static driver_t iopwdog_driver = {
  148         "iopwdog",
  149         iopwdog_methods,
  150         sizeof(struct iopwdog_softc),
  151 };
  152 static devclass_t iopwdog_devclass;
  153 
  154 DRIVER_MODULE(iopwdog, iq, iopwdog_driver, iopwdog_devclass, 0, 0);

Cache object: 835d6568cc1c473af5b335887fab21b7


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