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/ixp425/ixp425_wdog.c

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    1 /*-
    2  * Copyright (c) 2006 Sam Leffler.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  */
   24 #include <sys/cdefs.h>
   25 __FBSDID("$FreeBSD: releng/9.0/sys/arm/xscale/ixp425/ixp425_wdog.c 186352 2008-12-20 03:26:09Z sam $");
   26 
   27 /*
   28  * IXP4XX Watchdog Timer Support.
   29  */
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/time.h>
   35 #include <sys/bus.h>
   36 #include <sys/resource.h>
   37 #include <sys/rman.h>
   38 #include <sys/watchdog.h>
   39 
   40 #include <machine/bus.h>
   41 #include <machine/cpu.h>
   42 #include <machine/cpufunc.h>
   43 #include <machine/frame.h>
   44 #include <machine/resource.h>
   45 #include <machine/intr.h>
   46 
   47 #include <arm/xscale/ixp425/ixp425reg.h>
   48 #include <arm/xscale/ixp425/ixp425var.h>
   49 
   50 struct ixpwdog_softc {
   51         device_t                sc_dev;
   52 };
   53 
   54 static __inline uint32_t
   55 RD4(struct ixpwdog_softc *sc, bus_size_t off)
   56 {
   57         return bus_space_read_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off);
   58 }
   59 
   60 static __inline void
   61 WR4(struct ixpwdog_softc *sc, bus_size_t off, uint32_t val)
   62 {
   63         bus_space_write_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off, val);
   64 }
   65 
   66 static void
   67 ixp425_watchdog(void *arg, u_int cmd, int *error)
   68 {
   69         struct ixpwdog_softc *sc = arg;
   70         u_int u = cmd & WD_INTERVAL;
   71 
   72         WR4(sc, IXP425_OST_WDOG_KEY, OST_WDOG_KEY_MAJICK);
   73         if (4 <= u && u <= 35) {
   74                 WR4(sc, IXP425_OST_WDOG_ENAB, 0);
   75                 /* approximate 66.66MHz cycles */
   76                 WR4(sc, IXP425_OST_WDOG, 2<<(u - 4));
   77                 /* NB: reset on timer expiration */
   78                 WR4(sc, IXP425_OST_WDOG_ENAB,
   79                     OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA);
   80                 *error = 0;
   81         } else {
   82                 /* disable watchdog */
   83                 WR4(sc, IXP425_OST_WDOG_ENAB, 0);
   84         }
   85         WR4(sc, IXP425_OST_WDOG_KEY, 0);
   86 }
   87 
   88 static int
   89 ixpwdog_probe(device_t dev)
   90 {
   91         device_set_desc(dev, "IXP4XX Watchdog Timer");
   92         return (0);
   93 }
   94 
   95 static int
   96 ixpwdog_attach(device_t dev)
   97 {
   98         struct ixpwdog_softc *sc = device_get_softc(dev);
   99 
  100         sc->sc_dev = dev;
  101 
  102         EVENTHANDLER_REGISTER(watchdog_list, ixp425_watchdog, sc, 0);
  103         return (0);
  104 }
  105 
  106 static device_method_t ixpwdog_methods[] = {
  107         DEVMETHOD(device_probe,         ixpwdog_probe),
  108         DEVMETHOD(device_attach,        ixpwdog_attach),
  109         {0, 0},
  110 };
  111 
  112 static driver_t ixpwdog_driver = {
  113         "ixpwdog",
  114         ixpwdog_methods,
  115         sizeof(struct ixpwdog_softc),
  116 };
  117 static devclass_t ixpwdog_devclass;
  118 DRIVER_MODULE(ixpwdog, ixp, ixpwdog_driver, ixpwdog_devclass, 0, 0);

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