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/* $OpenBSD: sxidog.c,v 1.3 2021/10/24 17:52:27 mpi 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/device.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/fdt/sunxireg.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
extern void (*cpuresetfn)(void);
/* Allwinner A10 registers */
#define WDOG_CTRL_REG 0x00
#define WDOG_KEY (0x0a57 << 1)
#define WDOG_RSTART 0x01
#define WDOG_MODE_REG 0x04
#define WDOG_EN (1 << 0)
#define WDOG_RST_EN (1 << 1) /* system reset */
#define WDOG_INTV_VALUE(x) ((x) << 3)
/* Allwinner A31 registers */
#define WDOG0_CTRL_REG 0x10
#define WDOG0_KEY (0x0a57 << 1)
#define WDOG0_RSTART (1 << 0)
#define WDOG0_CFG_REG 0x14
#define WDOG0_RST_EN (1 << 0)
#define WDOG0_MODE_REG 0x18
#define WDOG0_EN (1 << 0)
#define WDOG0_INTV_VALUE(x) ((x) << 4)
struct sxidog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_type;
#define SXIDOG_A10 0
#define SXIDOG_A31 1
};
struct sxidog_softc *sxidog_sc = NULL; /* for sxidog_reset() */
int sxidog_match(struct device *, void *, void *);
void sxidog_attach(struct device *, struct device *, void *);
int sxidog_activate(struct device *, int);
int sxidog_callback(void *, int);
void sxidog_reset(void);
const struct cfattach sxidog_ca = {
sizeof (struct sxidog_softc), sxidog_match, sxidog_attach,
NULL, sxidog_activate
};
struct cfdriver sxidog_cd = {
NULL, "sxidog", DV_DULL
};
int
sxidog_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-wdt") ||
OF_is_compatible(faa->fa_node, "allwinner,sun6i-a31-wdt"));
}
void
sxidog_attach(struct device *parent, struct device *self, void *aux)
{
struct sxidog_softc *sc = (struct sxidog_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1)
return;
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh))
panic("sxidog_attach: bus_space_map failed!");
if (OF_is_compatible(faa->fa_node, "allwinner,sun6i-a31-wdt")) {
SXIWRITE4(sc, WDOG0_CFG_REG, WDOG0_RST_EN);
sc->sc_type = SXIDOG_A31;
} else
sc->sc_type = SXIDOG_A10;
sxidog_sc = sc;
cpuresetfn = sxidog_reset;
#ifndef SMALL_KERNEL
wdog_register(sxidog_callback, sc);
#endif
printf("\n");
}
int
sxidog_activate(struct device *self, int act)
{
switch (act) {
case DVACT_POWERDOWN:
#ifndef SMALL_KERNEL
wdog_shutdown(self);
#endif
break;
}
return (0);
}
int
sxidog_callback(void *arg, int period)
{
struct sxidog_softc *sc = (struct sxidog_softc *)arg;
int enable;
if (period > 16)
period = 16;
else if (period < 0)
period = 0;
/* Convert to register encoding. */
if (period > 6)
period = 6 + (period - 5) / 2;
switch (sc->sc_type) {
case SXIDOG_A10:
enable = (period > 0) ? WDOG_RST_EN : 0;
SXIWRITE4(sc, WDOG_MODE_REG,
enable | WDOG_EN | WDOG_INTV_VALUE(period));
SXIWRITE4(sc, WDOG_CTRL_REG, WDOG_KEY | WDOG_RSTART);
break;
case SXIDOG_A31:
enable = (period > 0) ? WDOG0_EN : 0;
SXIWRITE4(sc, WDOG0_MODE_REG,
enable | WDOG0_INTV_VALUE(period));
SXIWRITE4(sc, WDOG0_CTRL_REG, WDOG0_KEY | WDOG0_RSTART);
break;
}
/* Convert back to seconds. */
if (period > 6)
period = 6 + (period - 6) * 2;
return period;
}
void
sxidog_reset(void)
{
if (sxidog_sc == NULL)
return;
sxidog_callback(sxidog_sc, 1);
delay(1500000);
}
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