153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/* $NetBSD: wdog.c,v 1.7 2003/07/15 02:54:44 lukem Exp $ */
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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 IBM 405GP processor.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.7 2003/07/15 02:54:44 lukem 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/properties.h>
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#include <sys/wdog.h>
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#include <powerpc/spr.h>
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#include <powerpc/ibm4xx/dev/opbvar.h>
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#include <dev/sysmon/sysmonvar.h>
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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_armed;
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int sc_wdog_period;
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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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struct opb_attach_args *oaa = aux;
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/* match only watchdog devices */
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if (strcmp(oaa->opb_name, cf->cf_name) != 0)
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return (0);
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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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unsigned int processor_freq;
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if (board_info_get("processor-frequency",
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&processor_freq, sizeof(processor_freq)) == -1)
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processor_freq = 200 * 1000 * 1000; /* assume 200MHz */
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sc->sc_wdog_period = (2LL << 29) / processor_freq;
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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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uint32_t tsr;
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tsr = mfspr(SPR_TSR);
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tsr |= TSR_ENW | TSR_WIS;
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mtspr(SPR_TSR, tsr);
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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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uint32_t tcr, tsr;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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if (sc->sc_wdog_armed) {
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tsr = mfspr(SPR_TSR);
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tsr &= ~(TSR_ENW | TSR_WIS);
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mtspr(SPR_TSR, tsr);
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}
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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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* There's 4 set watchdog periods on the 405GP,
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* but we only support the longest one (2.684
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* seconds).
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*/
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return (EOPNOTSUPP);
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}
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sc->sc_wdog_armed = 1;
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tcr = mfspr(SPR_TCR);
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tcr |= TCR_WP_2_29 | TCR_WRC_SYSTEM;
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mtspr(SPR_TCR, tcr);
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/* Arm the watchdog. */
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wdog_tickle(smw);
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}
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return (0);
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}
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