182 lines
6.3 KiB
C
182 lines
6.3 KiB
C
/* $NetBSD: wdog.c,v 1.4 2006/09/04 05:17:26 gdamore Exp $ */
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/*-
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* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
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* Copyright (c) 2006 Garrett D'Amore.
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* All rights reserved.
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*
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* Portions of this code were written by Garrett D'Amore for the
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* Champaign-Urbana Community Wireless Network Project.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgements:
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* This product includes software developed by the Urbana-Champaign
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* Independent Media Center.
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* This product includes software developed by Garrett D'Amore.
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* 4. Urbana-Champaign Independent Media Center's name and Garrett
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* D'Amore's name may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
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* MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
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* MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2002 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Watchdog timer support for the AR531x.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.4 2006/09/04 05:17:26 gdamore Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/wdog.h>
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#include <machine/cpu.h>
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#include <mips/atheros/include/ar531xvar.h>
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#include <dev/sysmon/sysmonvar.h>
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#ifndef WDOG_DEFAULT_PERIOD
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#define WDOG_DEFAULT_PERIOD 5
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#endif
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static int wdog_match(struct device *, struct cfdata *, void *);
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static void wdog_attach(struct device *, struct device *, void *);
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static int wdog_tickle(struct sysmon_wdog *);
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static int wdog_setmode(struct sysmon_wdog *);
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struct wdog_softc {
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struct device sc_dev;
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struct sysmon_wdog sc_smw;
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int sc_wdog_period;
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int sc_wdog_max;
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uint32_t sc_wdog_reload;
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uint32_t sc_mult;
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};
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CFATTACH_DECL(wdog, sizeof(struct wdog_softc),
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wdog_match, wdog_attach, NULL, NULL);
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static int
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wdog_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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return (1);
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}
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static void
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wdog_attach(struct device *parent, struct device *self, void *aux)
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{
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struct wdog_softc *sc = (void *)self;
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sc->sc_mult = ar531x_bus_freq();
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sc->sc_wdog_period = WDOG_DEFAULT_PERIOD;
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sc->sc_wdog_max = 0xffffffffU / sc->sc_mult;
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sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
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printf(": %d second period\n", sc->sc_wdog_period);
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sc->sc_smw.smw_name = sc->sc_dev.dv_xname;
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sc->sc_smw.smw_cookie = sc;
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sc->sc_smw.smw_setmode = wdog_setmode;
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sc->sc_smw.smw_tickle = wdog_tickle;
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sc->sc_smw.smw_period = sc->sc_wdog_period;
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if (sysmon_wdog_register(&sc->sc_smw) != 0)
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printf("%s: unable to register with sysmon\n",
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sc->sc_dev.dv_xname);
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}
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static int
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wdog_tickle(struct sysmon_wdog *smw)
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{
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struct wdog_softc *sc = smw->smw_cookie;
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ar531x_wdog(sc->sc_wdog_reload);
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return (0);
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}
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static int
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wdog_setmode(struct sysmon_wdog *smw)
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{
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struct wdog_softc *sc = smw->smw_cookie;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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ar531x_wdog(0);
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} else {
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if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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smw->smw_period = sc->sc_wdog_period;
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else if (smw->smw_period != sc->sc_wdog_period) {
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/*
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* we can't set watchdog periods in excess of
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* the processor maximum.
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*/
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if (smw->smw_period > sc->sc_wdog_max) {
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return EOPNOTSUPP;
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}
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sc->sc_wdog_period = smw->smw_period;
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sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
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}
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ar531x_wdog(sc->sc_wdog_reload);
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}
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return (0);
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}
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