FreeBSD/Linux Kernel Cross Reference
sys/mips/mediatek/palmbus.c

     /*-
      * Copyright (c) 2016 Stanislav Galabov.
      * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/rman.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <dev/fdt/simplebus.h>
    
    /*
     * Driver for Mediatek/Ralink Palmbus
     *
     * Currently the only reason for the existence of this driver is so that we can
     * minimize the changes required to the upstream DTS files we use.
     * Otherwise palmbus is a very simple subclass of our simplebus and the only
     * difference between the two is the actual value of the compatible property.
     */
    
    static int
    palmbus_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!(ofw_bus_is_compatible(dev, "palmbus") &&
                ofw_bus_has_prop(dev, "ranges")) &&
                (ofw_bus_get_type(dev) == NULL || strcmp(ofw_bus_get_type(dev),
                "soc") != 0))
                    return (ENXIO);
    
            device_set_desc(dev, "MTK Palmbus");
    
            return (0);
    }
    
    static device_method_t palmbus_methods[] = {
            DEVMETHOD(device_probe,         palmbus_probe),
    
            DEVMETHOD_END
    };
    
    DEFINE_CLASS_1(palmbus, palmbus_driver, palmbus_methods,
        sizeof(struct simplebus_softc), simplebus_driver);
    static devclass_t palmbus_devclass;
    EARLY_DRIVER_MODULE(palmbus, ofwbus, palmbus_driver, palmbus_devclass, 0, 0,
        BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
    MODULE_VERSION(palmbus, 1);

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