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/* $OpenBSD: mvdog.c,v 1.1 2019/09/05 18:38:30 patrick Exp $ */
/*
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
*
* 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/ofw/openfirm.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/fdt.h>
#define CNTR_RETRIGGER 0
#define CNTR_WDOG 1
#define CNTR_CTRL(x) ((x) * 0x10)
#define CNTR_CTRL_ENABLE (1 << 0)
#define WDT_TIMER_SELECT 0x64
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct mvdog_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct regmap *sc_rm;
};
int mvdog_match(struct device *, void *, void *);
void mvdog_attach(struct device *, struct device *, void *);
struct cfattach mvdog_ca = {
sizeof (struct mvdog_softc), mvdog_match, mvdog_attach
};
struct cfdriver mvdog_cd = {
NULL, "mvdog", DV_DULL
};
int
mvdog_match(struct device *parent, void *cfdata, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "marvell,armada-3700-wdt");
}
void
mvdog_attach(struct device *parent, struct device *self, void *aux)
{
struct mvdog_softc *sc = (struct mvdog_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
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)) {
printf(": can't map registers\n");
return;
}
sc->sc_rm = regmap_byphandle(OF_getpropint(faa->fa_node,
"marvell,system-controller", 0));
if (sc->sc_rm == NULL) {
printf(": can't get regmap\n");
return;
}
printf("\n");
/* Disable watchdog timer. */
HCLR4(sc, CNTR_CTRL(CNTR_WDOG), CNTR_CTRL_ENABLE);
HCLR4(sc, CNTR_CTRL(CNTR_RETRIGGER), CNTR_CTRL_ENABLE);
regmap_write_4(sc->sc_rm, WDT_TIMER_SELECT, 0);
}
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