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/* $OpenBSD: omdog.c,v 1.1 2009/05/08 03:13:26 drahn Exp $ */
/*
* Copyright (c) 2007,2009 Dale Rahn <drahn@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/evcount.h>
#include <sys/socket.h>
#include <sys/timeout.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <arch/beagle/beagle/ahb.h>
#include <arch/beagle/dev/omgpiovar.h>
/* registers */
#define WIDR 0x00
#define WD_SYSCONFIG 0x10
#define WD_SYSSTATUS 0x14
#define WISR 0x18
#define WIER 0x1C
#define WCLR 0x24
#define WCRR 0x28
#define WLDR 0x2C
#define WTGR 0x30
#define WWPS 0x34
#define WWPS_PEND_ALL 0x1f
#define WSPR 0x48
#define WD_SIZE 0x80
struct omdog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct omdog_softc *omdog_sc;
/*
* to enable the watchdog, write 0xXXXXbbbb then 0xXXXX4444 to WSPR
* to disable the watchdog, write 0xXXXXaaaa then 0xXXXX5555 to WSPR
*/
int omdog_match(struct device *parent, void *v, void *aux);
void omdog_attach(struct device *parent, struct device *self, void *args);
void omdog_wpending(int flags);
struct cfattach omdog_ca = {
sizeof (struct omdog_softc), omdog_match, omdog_attach
};
struct cfdriver omdog_cd = {
NULL, "omdog", DV_DULL
};
int
omdog_match(struct device *parent, void *v, void *aux)
{
return (1);
}
void
omdog_attach(struct device *parent, struct device *self, void *args)
{
struct ahb_attach_args *aa = args;
struct omdog_softc *sc = (struct omdog_softc *) self;
u_int32_t rev;
sc->sc_iot = aa->aa_iot;
if (bus_space_map(sc->sc_iot, aa->aa_addr, WD_SIZE, 0, &sc->sc_ioh))
panic("gptimer_attach: bus_space_map failed!");
rev = bus_space_read_4(sc->sc_iot, sc->sc_ioh, WIDR);
printf(" rev %d.%d\n", rev >> 4 & 0xf, rev & 0xf);
omdog_sc = sc;
}
void
omdog_wpending(int flags)
{
struct omdog_softc *sc = omdog_sc;
while (bus_space_read_4(sc->sc_iot, sc->sc_ioh, WWPS) & flags)
;
}
void omdog_reset(void); /* XXX */
void
omdog_reset()
{
bus_space_write_4(omdog_sc->sc_iot, omdog_sc->sc_ioh, WCRR, 0xffffff80);
omdog_wpending(WWPS_PEND_ALL);
/* this sequence will start the watchdog. */
bus_space_write_4(omdog_sc->sc_iot, omdog_sc->sc_ioh, WSPR, 0xbbbb);
omdog_wpending(WWPS_PEND_ALL);
bus_space_write_4(omdog_sc->sc_iot, omdog_sc->sc_ioh, WSPR, 0x4444);
omdog_wpending(WWPS_PEND_ALL);
delay(100000);
}
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