/* $OpenBSD: mvsysctrl.c,v 1.2 2021/10/24 17:52:27 mpi Exp $ */
/*
 * Copyright (c) 2016 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 <armv7/armv7/armv7_machdep.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>

#define RSTOUTN                         0x60
#define  RSTOUTN_GLOBAL_SOFT_RSTOUT_EN  1
#define SYSSOFTRST                      0x64
#define  SYSSOFTRST_GLOBAL_SOFT_RST     1

#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 mvsysctrl_softc {
        struct device            sc_dev;
        bus_space_tag_t          sc_iot;
        bus_space_handle_t       sc_ioh;
};

int      mvsysctrl_match(struct device *, void *, void *);
void     mvsysctrl_attach(struct device *, struct device *, void *);

void     mvsysctrl_reset(void);

struct mvsysctrl_softc *mvsysctrl_sc;

const struct cfattach   mvsysctrl_ca = {
        sizeof (struct mvsysctrl_softc), mvsysctrl_match, mvsysctrl_attach
};

struct cfdriver mvsysctrl_cd = {
        NULL, "mvsysctrl", DV_DULL
};

int
mvsysctrl_match(struct device *parent, void *cfdata, void *aux)
{
        struct fdt_attach_args *faa = aux;

        return OF_is_compatible(faa->fa_node,
            "marvell,armada-370-xp-system-controller");
}

void
mvsysctrl_attach(struct device *parent, struct device *self, void *args)
{
        struct mvsysctrl_softc *sc = (struct mvsysctrl_softc *)self;
        struct fdt_attach_args *faa = args;

        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("%s: bus_space_map failed!", __func__);

        printf("\n");

        mvsysctrl_sc = sc;
        cpuresetfn = mvsysctrl_reset;
}

void
mvsysctrl_reset(void)
{
        struct mvsysctrl_softc *sc = mvsysctrl_sc;

        HWRITE4(sc, RSTOUTN, RSTOUTN_GLOBAL_SOFT_RSTOUT_EN);
        HWRITE4(sc, SYSSOFTRST, SYSSOFTRST_GLOBAL_SOFT_RST);

        for (;;)
                continue;
}