sys/arch/evbmips/atheros/wdog.c

   1 /* $NetBSD: wdog.c,v 1.4 2006/09/04 05:17:26 gdamore Exp $ */
   2 /*-
   3  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
   4  * Copyright (c) 2006 Garrett D'Amore.
   5  * All rights reserved.
   6  *
   7  * Portions of this code were written by Garrett D'Amore for the
   8  * Champaign-Urbana Community Wireless Network Project.
   9  *
  10  * Redistribution and use in source and binary forms, with or
  11  * without modification, are permitted provided that the following
  12  * conditions 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
  16  *    copyright notice, this list of conditions and the following
  17  *    disclaimer in the documentation and/or other materials provided
  18  *    with the distribution.
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgements:
  21  *      This product includes software developed by the Urbana-Champaign
  22  *      Independent Media Center.
  23  *      This product includes software developed by Garrett D'Amore.
  24  * 4. Urbana-Champaign Independent Media Center's name and Garrett
  25  *    D'Amore's name may not be used to endorse or promote products
  26  *    derived from this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
  29  * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
  30  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  31  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
  33  * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  36  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  37  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  38  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  40  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41  */
  42 /*
  43  * Copyright (c) 2002 Wasabi Systems, Inc.
  44  * All rights reserved.
  45  *
  46  * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. All advertising materials mentioning features or use of this software
  57  *    must display the following acknowledgement:
  58  *      This product includes software developed for the NetBSD Project by
  59  *      Wasabi Systems, Inc.
  60  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  61  *    or promote products derived from this software without specific prior
  62  *    written permission.
  63  *
  64  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  65  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  66  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  67  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  68  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  69  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  70  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  71  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  72  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  73  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  74  * POSSIBILITY OF SUCH DAMAGE.
  75  */
  76
  77 /*
  78  * Watchdog timer support for the AR531x.
  79  */
  80
  81 #include <sys/cdefs.h>
  82 __KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.4 2006/09/04 05:17:26 gdamore Exp $");
  83
  84 #include <sys/param.h>
  85 #include <sys/systm.h>
  86 #include <sys/device.h>
  87 #include <sys/wdog.h>
  88
  89 #include <machine/cpu.h>
  90
  91 #include <mips/atheros/include/ar531xvar.h>
  92
  93 #include <dev/sysmon/sysmonvar.h>
  94
  95 #ifndef WDOG_DEFAULT_PERIOD
  96 #define WDOG_DEFAULT_PERIOD     5
  97 #endif
  98
  99 static int wdog_match(device_t, struct cfdata *, void *);
 100 static void wdog_attach(device_t, device_t, void *);
 101 static int wdog_tickle(struct sysmon_wdog *);
 102 static int wdog_setmode(struct sysmon_wdog *);
 103
 104 struct wdog_softc {
 105         struct sysmon_wdog      sc_smw;
 106         int                     sc_wdog_period;
 107         int                     sc_wdog_max;
 108         uint32_t                sc_wdog_reload;
 109         uint32_t                sc_mult;
 110 };
 111
 112 CFATTACH_DECL_NEW(wdog, sizeof(struct wdog_softc),
 113     wdog_match, wdog_attach, NULL, NULL);
 114
 115 static int
 116 wdog_match(device_t parent, struct cfdata *cf, void *aux)
 117 {
 118
 119         return (1);
 120 }
 121
 122 static void
 123 wdog_attach(device_t parent, device_t self, void *aux)
 124 {
 125         struct wdog_softc *sc = device_private(self);
 126
 127         sc->sc_mult = ar531x_bus_freq();
 128         sc->sc_wdog_period = WDOG_DEFAULT_PERIOD;
 129         sc->sc_wdog_max = 0xffffffffU / sc->sc_mult;
 130         sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
 131         aprint_normal(": %d second period\n", sc->sc_wdog_period);
 132
 133         sc->sc_smw.smw_name = device_xname(self);
 134         sc->sc_smw.smw_cookie = sc;
 135         sc->sc_smw.smw_setmode = wdog_setmode;
 136         sc->sc_smw.smw_tickle = wdog_tickle;
 137         sc->sc_smw.smw_period = sc->sc_wdog_period;
 138
 139         if (sysmon_wdog_register(&sc->sc_smw) != 0) {
 140                 aprint_error_dev(self,
 141                     "unable to register with sysmon\n");
 142         }
 143 }
 144
 145 static int
 146 wdog_tickle(struct sysmon_wdog *smw)
 147 {
 148         struct wdog_softc *sc = smw->smw_cookie;
 149
 150         ar531x_wdog(sc->sc_wdog_reload);
 151         return (0);
 152 }
 153
 154 static int
 155 wdog_setmode(struct sysmon_wdog *smw)
 156 {
 157         struct wdog_softc *sc = smw->smw_cookie;
 158
 159         if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
 160                 ar531x_wdog(0);
 161         } else {
 162
 163                 if (smw->smw_period == WDOG_PERIOD_DEFAULT)
 164                         smw->smw_period = sc->sc_wdog_period;
 165                 else if (smw->smw_period != sc->sc_wdog_period) {
 166                         /*
 167                          * we can't set watchdog periods in excess of
 168                          * the processor maximum.
 169                          */
 170                         if (smw->smw_period > sc->sc_wdog_max) {
 171                                 return EOPNOTSUPP;
 172                         }
 173                         sc->sc_wdog_period = smw->smw_period;
 174                         sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
 175                 }
 176
 177                 ar531x_wdog(sc->sc_wdog_reload);
 178         }
 179
 180         return (0);
 181 }