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/* $OpenBSD: sxidog.c,v 1.3 2013/11/06 19:03:07 syl 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 <armv7/sunxi/sunxireg.h>
#include <armv7/armv7/armv7var.h>
/* XXX other way around than bus_space_subregion? */
extern bus_space_handle_t sxitimer_ioh;
/* registers */
#define WDOG_CR 0x00
#define WDOG_MR 0x04
#define WDOG_CTRL_KEY (0x0a57 << 1)
#define WDOG_RESTART 0x01
/*
* 0x00 0,5sec
* 0x01 1sec
* 0x02 2sec
* 0x03 3sec
* 0x04 4sec
* 0x05 5sec
* 0x06 6sec
* 0x07 8sec
* 0x08 10sec
* 0x09 12sec
* 0x0a 14sec
* 0x0b 16sec
*/
#define WDOG_INTV_VALUE(x) ((x) << 3)
#define WDOG_RST_EN (1 << 1) /* system reset */
#define WDOG_EN (1 << 0)
struct sxidog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct sxidog_softc *sxidog_sc = NULL; /* for sxidog_reset() */
void sxidog_attach(struct device *, struct device *, void *);
int sxidog_callback(void *, int);
#if 0
int sxidog_intr(void *);
#endif
void sxidog_reset(void);
struct cfattach sxidog_ca = {
sizeof (struct sxidog_softc), NULL, sxidog_attach
};
struct cfdriver sxidog_cd = {
NULL, "sxidog", DV_DULL
};
void
sxidog_attach(struct device *parent, struct device *self, void *args)
{
struct armv7_attach_args *aa = args;
struct sxidog_softc *sc = (struct sxidog_softc *)self;
sc->sc_iot = aa->aa_iot;
if (bus_space_subregion(sc->sc_iot, sxitimer_ioh,
aa->aa_dev->mem[0].addr, aa->aa_dev->mem[0].size, &sc->sc_ioh))
panic("sxidog_attach: bus_space_subregion failed!");
#ifdef DEBUG
printf(": ctrl %x mode %x\n", SXIREAD4(sc, WDOG_CR),
SXIREAD4(sc, WDOG_MR));
#endif
#if 0
(void)intc_intr_establish(aa->aa_dev->irq[0], IPL_HIGH, /* XXX */
sxidog_intr, sc, sc->sc_dev.dv_xname);
#endif
sxidog_sc = sc;
wdog_register(sxidog_callback, sc);
printf("\n");
}
int
sxidog_callback(void *arg, int period)
{
struct sxidog_softc *sc = (struct sxidog_softc *)arg;
if (period > 0x0b)
period = 0x0b;
else if (period < 0)
period = 0;
/*
* clearing bits in mode reg has no effect according
* to the user manual, so just set new timeout and enable it.
* XXX
*/
SXIWRITE4(sc, WDOG_MR, WDOG_EN | WDOG_RST_EN |
WDOG_INTV_VALUE(period));
/* reset */
SXIWRITE4(sc, WDOG_CR, WDOG_CTRL_KEY | WDOG_RESTART);
return period;
}
#if 0
int
sxidog_intr(void *arg)
{
struct sxidog_softc *sc = (struct sxidog_softc *)arg;
/* XXX */
SXIWRITE4(sc, WDOG_CR, WDOG_CTRL_KEY | WDOG_RESTART);
return 1;
}
#endif
void
sxidog_reset(void)
{
if (sxidog_sc == NULL)
return;
SXIWRITE4(sxidog_sc, WDOG_MR, WDOG_INTV_VALUE(0x00) |
WDOG_RST_EN | WDOG_EN);
SXIWRITE4(sxidog_sc, WDOG_CR, WDOG_CTRL_KEY | WDOG_RESTART);
delay(900000);
}
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