NetBSD-5.0.2/sys/arch/evbmips/atheros/wdog.c
/* $NetBSD: wdog.c,v 1.5 2008/02/11 20:27:01 dyoung Exp $ */
/*-
* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
* Copyright (c) 2006 Garrett D'Amore.
* All rights reserved.
*
* Portions of this code were written by Garrett D'Amore for the
* Champaign-Urbana Community Wireless Network Project.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgements:
* This product includes software developed by the Urbana-Champaign
* Independent Media Center.
* This product includes software developed by Garrett D'Amore.
* 4. Urbana-Champaign Independent Media Center's name and Garrett
* D'Amore's name may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
* MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
* MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Watchdog timer support for the AR531x.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.5 2008/02/11 20:27:01 dyoung Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/wdog.h>
#include <machine/cpu.h>
#include <mips/atheros/include/ar531xvar.h>
#include <dev/sysmon/sysmonvar.h>
#ifndef WDOG_DEFAULT_PERIOD
#define WDOG_DEFAULT_PERIOD 5
#endif
static int wdog_match(device_t, struct cfdata *, void *);
static void wdog_attach(device_t, device_t, void *);
static int wdog_tickle(struct sysmon_wdog *);
static int wdog_setmode(struct sysmon_wdog *);
struct wdog_softc {
struct sysmon_wdog sc_smw;
int sc_wdog_period;
int sc_wdog_max;
uint32_t sc_wdog_reload;
uint32_t sc_mult;
};
CFATTACH_DECL_NEW(wdog, sizeof(struct wdog_softc),
wdog_match, wdog_attach, NULL, NULL);
static int
wdog_match(device_t parent, struct cfdata *cf, void *aux)
{
return (1);
}
static void
wdog_attach(device_t parent, device_t self, void *aux)
{
struct wdog_softc *sc = device_private(self);
sc->sc_mult = ar531x_bus_freq();
sc->sc_wdog_period = WDOG_DEFAULT_PERIOD;
sc->sc_wdog_max = 0xffffffffU / sc->sc_mult;
sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
aprint_normal(": %d second period\n", sc->sc_wdog_period);
sc->sc_smw.smw_name = device_xname(self);
sc->sc_smw.smw_cookie = sc;
sc->sc_smw.smw_setmode = wdog_setmode;
sc->sc_smw.smw_tickle = wdog_tickle;
sc->sc_smw.smw_period = sc->sc_wdog_period;
if (sysmon_wdog_register(&sc->sc_smw) != 0) {
aprint_error_dev(self,
"unable to register with sysmon\n");
}
}
static int
wdog_tickle(struct sysmon_wdog *smw)
{
struct wdog_softc *sc = smw->smw_cookie;
ar531x_wdog(sc->sc_wdog_reload);
return (0);
}
static int
wdog_setmode(struct sysmon_wdog *smw)
{
struct wdog_softc *sc = smw->smw_cookie;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
ar531x_wdog(0);
} else {
if (smw->smw_period == WDOG_PERIOD_DEFAULT)
smw->smw_period = sc->sc_wdog_period;
else if (smw->smw_period != sc->sc_wdog_period) {
/*
* we can't set watchdog periods in excess of
* the processor maximum.
*/
if (smw->smw_period > sc->sc_wdog_max) {
return EOPNOTSUPP;
}
sc->sc_wdog_period = smw->smw_period;
sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
}
ar531x_wdog(sc->sc_wdog_reload);
}
return (0);
}