/*      $OpenBSD: aplrtk.c,v 1.4 2024/10/29 21:19:25 kettenis Exp $     */
/*
 * Copyright (c) 2022 Mark Kettenis <kettenis@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 <sys/malloc.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 <arm64/dev/rtkit.h>

#define CPU_CTRL                0x0044
#define CPU_CTRL_RUN            (1 << 4)

#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))

struct aplrtk_softc {
        struct device           sc_dev;
        bus_space_tag_t         sc_iot;
        bus_space_handle_t      sc_ioh;
        bus_dma_tag_t           sc_dmat;

        int                     sc_node;
        uint32_t                sc_phandle;

        struct rtkit            sc_rtkit;
        struct rtkit_state      *sc_state;
};

int     aplrtk_match(struct device *, void *, void *);
void    aplrtk_attach(struct device *, struct device *, void *);

const struct cfattach aplrtk_ca = {
        sizeof (struct aplrtk_softc), aplrtk_match, aplrtk_attach
};

struct cfdriver aplrtk_cd = {
        NULL, "aplrtk", DV_DULL
};

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

        return OF_is_compatible(faa->fa_node, "apple,rtk-helper-asc4");
}

void
aplrtk_attach(struct device *parent, struct device *self, void *aux)
{
        struct aplrtk_softc *sc = (struct aplrtk_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_dmat = faa->fa_dmat;
        sc->sc_node = faa->fa_node;
        sc->sc_phandle = OF_getpropint(faa->fa_node, "phandle", 0);

        printf("\n");
}

int
aplrtk_do_start(struct aplrtk_softc *sc)
{
        uint32_t ctrl;

        ctrl = HREAD4(sc, CPU_CTRL);
        HWRITE4(sc, CPU_CTRL, ctrl | CPU_CTRL_RUN);

        sc->sc_rtkit.rk_cookie = sc;
        sc->sc_rtkit.rk_dmat = sc->sc_dmat;
        sc->sc_state = rtkit_init(sc->sc_node, NULL, 0, &sc->sc_rtkit);
        if (sc->sc_state == NULL)
                return EIO;

        return rtkit_boot(sc->sc_state);
}

int
aplrtk_start(uint32_t phandle)
{
        struct aplrtk_softc *sc;
        int i;

        for (i = 0; i < aplrtk_cd.cd_ndevs; i++) {
                sc = aplrtk_cd.cd_devs[i];
                if (sc == NULL)
                        continue;
                if (sc->sc_phandle == phandle)
                        return aplrtk_do_start(sc);
        }

        return ENXIO;
}