f29fa1dfa4
watchdog might hide the succesful arming of an earlier one. Accept that on failing to arm any watchdog (because of non-supported timeouts) EOPNOTSUPP is returned instead of the more appropriate EINVAL. MFC after: 3 days
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* $NetBSD: i80321_wdog.c,v 1.6 2003/07/15 00:24:54 lukem Exp $ */
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/*-
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* Copyright (c) 2005 Olivier Houchard
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/watchdog.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <machine/cpufunc.h>
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#include <machine/machdep.h>
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#include <arm/xscale/i80321/i80321reg.h>
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#include <arm/xscale/i80321/i80321var.h>
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struct iopwdog_softc {
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device_t dev;
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int armed;
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int 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 void
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iopwdog_tickle(void *arg)
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{
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struct iopwdog_softc *sc = arg;
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if (!sc->armed)
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return;
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wdtcr_write(WDTCR_ENABLE1);
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wdtcr_write(WDTCR_ENABLE2);
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}
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static int
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iopwdog_probe(device_t dev)
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{
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struct iopwdog_softc *sc = device_get_softc(dev);
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char buf[128];
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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->wdog_period = 7;
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sprintf(buf, "i80321 Watchdog, must be tickled every %d seconds",
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sc->wdog_period);
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device_set_desc_copy(dev, buf);
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return (0);
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}
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static void
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iopwdog_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct iopwdog_softc *sc = private;
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cmd &= WD_INTERVAL;
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if (cmd > 0 && cmd <= 63
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&& (uint64_t)1<<cmd <= (uint64_t)sc->wdog_period * 1000000000) {
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/* Valid value -> Enable watchdog */
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iopwdog_tickle(sc);
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sc->armed = 1;
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*error = 0;
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} else {
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/* Can't disable this watchdog! */
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if (sc->armed)
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*error = EOPNOTSUPP;
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}
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}
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static int
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iopwdog_attach(device_t dev)
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{
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struct iopwdog_softc *sc = device_get_softc(dev);
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sc->dev = dev;
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sc->armed = 0;
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EVENTHANDLER_REGISTER(watchdog_list, iopwdog_watchdog_fn, sc, 0);
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return (0);
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}
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static device_method_t iopwdog_methods[] = {
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DEVMETHOD(device_probe, iopwdog_probe),
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DEVMETHOD(device_attach, iopwdog_attach),
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{0, 0},
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};
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static driver_t iopwdog_driver = {
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"iopwdog",
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iopwdog_methods,
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sizeof(struct iopwdog_softc),
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};
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static devclass_t iopwdog_devclass;
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DRIVER_MODULE(iopwdog, iq, iopwdog_driver, iopwdog_devclass, 0, 0);
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