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130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/* $NetBSD: admwdog.c,v 1.4 2012/10/27 17:18:01 chs Exp $ */
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/*-
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* Copyright (c) 2007 David Young. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: admwdog.c,v 1.4 2012/10/27 17:18:01 chs 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 <sys/kernel.h> /* for hz */
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#include <sys/bus.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <mips/adm5120/include/adm5120reg.h>
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#include <mips/adm5120/include/adm5120var.h>
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#include <mips/adm5120/include/adm5120_obiovar.h>
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#include <mips/adm5120/dev/if_admswvar.h>
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/* maximum watchdog period, seconds */
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#define ADMWDOG_MAX_PERIOD (__SHIFTOUT_MASK(ADM5120_WDOG_WTS_MASK) / 100)
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static int admwdog_setmode(struct sysmon_wdog *smw);
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static int admwdog_tickle(struct sysmon_wdog *smw);
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static inline uint32_t
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admwdog_read(struct admsw_softc *sc)
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{
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return bus_space_read_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0);
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}
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static inline void
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admwdog_write(struct admsw_softc *sc, uint32_t val)
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{
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bus_space_write_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0, val);
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}
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static void
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admwdog_reset(struct admsw_softc *sc)
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{
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int s;
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uint32_t wdog0;
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wdog0 = __SHIFTIN(sc->sc_smw.smw_period * 100, ADM5120_WDOG_WTS_MASK) |
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__SHIFTIN(1, ADM5120_WDOG_WT_MASK);
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s = splhigh();
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admwdog_write(sc, wdog0);
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(void)admwdog_read(sc);
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admwdog_write(sc, ADM5120_WDOG0_WTTR | wdog0);
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splx(s);
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}
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static int
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admwdog_setmode(struct sysmon_wdog *smw)
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{
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struct admsw_softc *sc = smw->smw_cookie;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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admwdog_write(sc, 0);
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return 0;
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}
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if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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smw->smw_period = 32;
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else if (smw->smw_period > ADMWDOG_MAX_PERIOD)
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return EINVAL;
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admwdog_reset(sc);
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return 0;
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}
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static int
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admwdog_tickle(struct sysmon_wdog *smw)
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{
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struct admsw_softc *sc = smw->smw_cookie;
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(void)admwdog_read(sc);
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return 0;
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}
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void
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admwdog_attach(struct admsw_softc *sc)
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{
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struct sysmon_wdog *smw = &sc->sc_smw;
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/* deactivate watchdog */
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admwdog_write(sc, 0);
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smw->smw_name = device_xname(sc->sc_dev);
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smw->smw_cookie = sc;
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smw->smw_setmode = admwdog_setmode;
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smw->smw_tickle = admwdog_tickle;
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smw->smw_period = ADMWDOG_MAX_PERIOD;
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sysmon_wdog_register(&sc->sc_smw);
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}
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