/* $OpenBSD: mvdog.c,v 1.2 2021/10/24 17:52:26 mpi 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 *);

const 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);
}