/* $OpenBSD: expower.c,v 1.11 2023/09/22 01:10:43 jsg Exp $ */
/*
 * Copyright (c) 2012-2013 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>

#include <machine/simplebusvar.h>

#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 expower_softc {
	struct simplebus_softc	sc_sbus;
	bus_space_tag_t		sc_iot;
	bus_space_handle_t	sc_ioh;
};

int expower_match(struct device *, void *, void *);
void expower_attach(struct device *, struct device *, void *);

const struct cfattach	expower_ca = {
	sizeof (struct expower_softc), expower_match, expower_attach
};

struct cfdriver expower_cd = {
	NULL, "expower", DV_DULL
};

int
expower_match(struct device *parent, void *match, void *aux)
{
	struct fdt_attach_args *faa = aux;

	if (OF_is_compatible(faa->fa_node, "samsung,exynos5250-pmu") ||
	    OF_is_compatible(faa->fa_node, "samsung,exynos5420-pmu"))
		return 10;	/* Must beat syscon(4). */

	return 0;
}

void
expower_attach(struct device *parent, struct device *self, void *aux)
{
	struct expower_softc *sc = (struct expower_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;
	}

	regmap_register(faa->fa_node, sc->sc_iot, sc->sc_ioh,
	    faa->fa_reg[0].size);

	simplebus_attach(parent, &sc->sc_sbus.sc_dev, faa);
}