/*-
 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
 * Copyright (c) 2014 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by SRI International and the University of
 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
 * ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Portions of this software were developed by Andrew Turner
 * under sponsorship from the FreeBSD Foundation.
 *
 * 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.
 */

/*
 * VirtIO MMIO interface.
 * This driver is heavily based on VirtIO PCI interface driver.
 */

/*
 * FDT example:
 *              virtio_block@1000 {
 *                      compatible = "virtio,mmio";
 *                      reg = <0x1000 0x100>;
 *                      interrupts = <63>;
 *                      interrupt-parent = <&GIC>;
 *              };
 */

#include "opt_platform.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>

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

#include <dev/virtio/mmio/virtio_mmio.h>

static int      vtmmio_fdt_probe(device_t);

static device_method_t vtmmio_fdt_methods[] = {
        /* Device interface. */
        DEVMETHOD(device_probe,         vtmmio_fdt_probe),

        DEVMETHOD_END
};

DEFINE_CLASS_1(virtio_mmio, vtmmio_fdt_driver, vtmmio_fdt_methods,
    sizeof(struct vtmmio_softc), vtmmio_driver);

DRIVER_MODULE(virtio_mmio, simplebus, vtmmio_fdt_driver, 0, 0);
DRIVER_MODULE(virtio_mmio, ofwbus, vtmmio_fdt_driver, 0,0);
MODULE_DEPEND(virtio_mmio, simplebus, 1, 1, 1);
MODULE_DEPEND(virtio_mmio, virtio, 1, 1, 1);

static int
vtmmio_fdt_probe(device_t dev)
{

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

        if (!ofw_bus_is_compatible(dev, "virtio,mmio"))
                return (ENXIO);

        return (vtmmio_probe(dev));
}