/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Vybrid Family System Reset Controller (SRC)
 * Chapter 18, Vybrid Reference Manual, Rev. 5, 07/2013
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>

#include <arm/freescale/vybrid/vf_src.h>
#include <arm/freescale/vybrid/vf_common.h>

#define SRC_SCR         0x00    /* SRC Control Register */
#define SRC_SBMR1       0x04    /* SRC Boot Mode Register 1 */
#define SRC_SRSR        0x08    /* SRC Status Register */
#define SRC_SECR        0x0C    /* SRC_SECR */
#define SRC_SICR        0x14    /* SRC Reset Interrupt Configuration Register */
#define SRC_SIMR        0x18    /* SRC Interrupt Masking Register */
#define SRC_SBMR2       0x1C    /* SRC Boot Mode Register 2 */
#define SRC_GPR0        0x20    /* General Purpose Register */
#define SRC_GPR1        0x24    /* General Purpose Register */
#define SRC_GPR2        0x28    /* General Purpose Register */
#define SRC_GPR3        0x2C    /* General Purpose Register */
#define SRC_GPR4        0x30    /* General Purpose Register */
#define SRC_MISC0       0x4C    /* MISC0 */
#define SRC_MISC1       0x50    /* MISC1 */
#define SRC_MISC2       0x54    /* MISC2 */
#define SRC_MISC3       0x58    /* MISC3 */

struct src_softc {
        struct resource         *res[1];
        bus_space_tag_t         bst;
        bus_space_handle_t      bsh;
};

struct src_softc *src_sc;

static struct resource_spec src_spec[] = {
        { SYS_RES_MEMORY,       0,      RF_ACTIVE },
        { -1, 0 }
};

int
src_swreset(void)
{

        if (src_sc == NULL)
                return (1);

        WRITE4(src_sc, SRC_SCR, SW_RST);

        return (0);
}

static int
src_probe(device_t dev)
{

        if (!ofw_bus_status_okay(dev))
                return (ENXIO);

        if (!ofw_bus_is_compatible(dev, "fsl,mvf600-src"))
                return (ENXIO);

        device_set_desc(dev, "Vybrid Family System Reset Controller");
        return (BUS_PROBE_DEFAULT);
}

static int
src_attach(device_t dev)
{
        struct src_softc *sc;

        sc = device_get_softc(dev);

        if (bus_alloc_resources(dev, src_spec, sc->res)) {
                device_printf(dev, "could not allocate resources\n");
                return (ENXIO);
        }

        /* Memory interface */
        sc->bst = rman_get_bustag(sc->res[0]);
        sc->bsh = rman_get_bushandle(sc->res[0]);

        src_sc = sc;

        return (0);
}

static device_method_t src_methods[] = {
        DEVMETHOD(device_probe,         src_probe),
        DEVMETHOD(device_attach,        src_attach),
        { 0, 0 }
};

static driver_t src_driver = {
        "src",
        src_methods,
        sizeof(struct src_softc),
};

DRIVER_MODULE(src, simplebus, src_driver, 0, 0);