Add support for the i80321 watchdog timer.
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thorpej
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# $NetBSD: files.i80321,v 1.4 2002/07/29 17:37:14 thorpej Exp $
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# $NetBSD: files.i80321,v 1.5 2002/07/29 18:40:04 thorpej Exp $
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#
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# Configuration info for Intel i80321 XScale I/O Processor support
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#
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@ -14,5 +14,9 @@ file arch/arm/xscale/i80321.c iopxs
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file arch/arm/xscale/i80321_pci.c iopxs
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file arch/arm/xscale/i80321_pci_dma.c iopxs
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file arch/arm/xscale/i80321_space.c iopxs
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file arch/arm/xscale/i80321_local_dma.c iopxs
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# Watchdog timer
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device iopwdog: sysmon_wdog
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attach iopwdog at iopxs
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file arch/arm/xscale/i80321_wdog.c iopwdog
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@ -0,0 +1,141 @@
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/* $NetBSD: i80321_wdog.c,v 1.1 2002/07/29 18:40:04 thorpej 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 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 Intel i80321 I/O processor.
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*/
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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/bus.h>
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#include <arm/cpufunc.h>
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#include <arm/xscale/i80321reg.h>
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#include <arm/xscale/i80321var.h>
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#include <dev/sysmon/sysmonvar.h>
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struct iopwdog_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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static __inline void
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wdtcr_write(uint32_t val)
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{
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__asm __volatile("mcr p6, 0, %0, c7, c1, 0"
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:
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: "r" (val));
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}
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static int
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iopwdog_tickle(struct sysmon_wdog *smw)
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{
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wdtcr_write(WDTCR_ENABLE1);
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wdtcr_write(WDTCR_ENABLE2);
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return (0);
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}
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static int
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iopwdog_setmode(struct sysmon_wdog *smw)
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{
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struct iopwdog_softc *sc = smw->smw_cookie;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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/* The i80321 watchdog can't be disarmed once armed. */
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if (sc->sc_wdog_armed)
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return (EOPNOTSUPP);
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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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/* Can't change the i80321 watchdog period. */
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return (EOPNOTSUPP);
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}
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sc->sc_wdog_armed = 1;
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/* Watchdog is armed by tickling it. */
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iopwdog_tickle(smw);
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}
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return (0);
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}
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static int
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iopwdog_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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struct iopxs_attach_args *ia = aux;
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if (strcmp(cf->cf_driver->cd_name, ia->ia_name) == 0)
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return (1);
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return (0);
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}
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static void
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iopwdog_attach(struct device *parent, struct device *self, void *aux)
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{
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struct iopwdog_softc *sc = (void *) self;
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/*
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* XXX Should compute the period based on processor speed.
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* For a 600MHz XScale core, the wdog must be tickled approx.
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* every 7 seconds.
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*/
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sc->sc_wdog_period = 7;
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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 = iopwdog_setmode;
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sc->sc_smw.smw_tickle = iopwdog_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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struct cfattach iopwdog_ca = {
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sizeof(struct iopwdog_softc), iopwdog_match, iopwdog_attach,
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};
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