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/i80321/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("$FreeBSD$");
   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/i80321/i80321reg.h>
   58 #include <arm/xscale/i80321/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         __asm __volatile("mcr p6, 0, %0, c7, c1, 0"
   72                 :
   73                 : "r" (val));
   74 }
   75 
   76 static void
   77 iopwdog_tickle(void *arg)
   78 {
   79         struct iopwdog_softc *sc = arg;
   80 
   81         if (!sc->armed)
   82                 return;
   83         wdtcr_write(WDTCR_ENABLE1);
   84         wdtcr_write(WDTCR_ENABLE2);
   85 }
   86 
   87 static int
   88 iopwdog_probe(device_t dev)
   89 {
   90         struct iopwdog_softc *sc = device_get_softc(dev);
   91         char buf[128];
   92 
   93         /*
   94          * XXX Should compute the period based on processor speed.
   95          * For a 600MHz XScale core, the wdog must be tickled approx.
   96          * every 7 seconds.
   97          */
   98 
   99         sc->wdog_period = 7;
  100         sprintf(buf, "i80321 Watchdog, must be tickled every %d seconds",
  101             sc->wdog_period);
  102         device_set_desc_copy(dev, buf);
  103 
  104         return (0);
  105 }
  106 
  107 static void
  108 iopwdog_watchdog_fn(void *private, u_int cmd, int *error)
  109 {
  110         struct iopwdog_softc *sc = private;
  111 
  112         cmd &= WD_INTERVAL;
  113         if (cmd > 0 && cmd <= 63
  114             && (uint64_t)1 << (cmd & WD_INTERVAL) <=
  115                (uint64_t)sc->wdog_period * 1000000000) {
  116                 /* Valid value -> Enable watchdog */
  117                 iopwdog_tickle(sc);
  118                 sc->armed = 1;
  119                 *error = 0;
  120         } else {
  121                 /* Can't disable this watchdog! */
  122                 if (sc->armed)
  123                         *error = EOPNOTSUPP;
  124         }
  125 }
  126 
  127 static int
  128 iopwdog_attach(device_t dev)
  129 {
  130         struct iopwdog_softc *sc = device_get_softc(dev);
  131         
  132         sc->dev = dev;
  133         sc->armed = 0;
  134         EVENTHANDLER_REGISTER(watchdog_list, iopwdog_watchdog_fn, sc, 0);
  135         return (0);
  136 }
  137 
  138 static device_method_t iopwdog_methods[] = {
  139         DEVMETHOD(device_probe, iopwdog_probe),
  140         DEVMETHOD(device_attach, iopwdog_attach),
  141         {0, 0},
  142 };
  143 
  144 static driver_t iopwdog_driver = {
  145         "iopwdog",
  146         iopwdog_methods,
  147         sizeof(struct iopwdog_softc),
  148 };
  149 static devclass_t iopwdog_devclass;
  150 
  151 DRIVER_MODULE(iopwdog, iq, iopwdog_driver, iopwdog_devclass, 0, 0);

Cache object: 51b3bb89160a5c276b5859ba570ceffc


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