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/*-
* Copyright (c) 2006 Sam Leffler. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IXP4XX Watchdog Timer Support.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <arm/xscale/ixp425/ixp425reg.h>
#include <arm/xscale/ixp425/ixp425var.h>
struct ixpwdog_softc {
device_t sc_dev;
};
static __inline uint32_t
RD4(struct ixpwdog_softc *sc, bus_size_t off)
{
return bus_space_read_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off);
}
static __inline void
WR4(struct ixpwdog_softc *sc, bus_size_t off, uint32_t val)
{
bus_space_write_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off, val);
}
static void
ixp425_watchdog(void *arg, u_int cmd, int *error)
{
struct ixpwdog_softc *sc = arg;
u_int u = cmd & WD_INTERVAL;
WR4(sc, IXP425_OST_WDOG_KEY, OST_WDOG_KEY_MAJICK);
if (4 <= u && u <= 35) {
WR4(sc, IXP425_OST_WDOG_ENAB, 0);
/* approximate 66.66MHz cycles */
WR4(sc, IXP425_OST_WDOG, 2<<(u - 4));
/* NB: reset on timer expiration */
WR4(sc, IXP425_OST_WDOG_ENAB,
OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA);
*error = 0;
} else {
/* disable watchdog */
WR4(sc, IXP425_OST_WDOG_ENAB, 0);
}
WR4(sc, IXP425_OST_WDOG_KEY, 0);
}
static int
ixpwdog_probe(device_t dev)
{
device_set_desc(dev, "IXP4XX Watchdog Timer");
return (0);
}
static int
ixpwdog_attach(device_t dev)
{
struct ixpwdog_softc *sc = device_get_softc(dev);
sc->sc_dev = dev;
EVENTHANDLER_REGISTER(watchdog_list, ixp425_watchdog, sc, 0);
return (0);
}
static device_method_t ixpwdog_methods[] = {
DEVMETHOD(device_probe, ixpwdog_probe),
DEVMETHOD(device_attach, ixpwdog_attach),
{0, 0},
};
static driver_t ixpwdog_driver = {
"ixpwdog",
ixpwdog_methods,
sizeof(struct ixpwdog_softc),
};
static devclass_t ixpwdog_devclass;
DRIVER_MODULE(ixpwdog, ixp, ixpwdog_driver, ixpwdog_devclass, 0, 0);
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