The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2016 Stanislav Galabov.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/12.0/sys/mips/mediatek/palmbus.c 298498 2016-04-23 04:21:18Z sgalabov $");
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/module.h>
   32 #include <sys/bus.h>
   33 #include <sys/conf.h>
   34 #include <sys/kernel.h>
   35 #include <sys/rman.h>
   36 
   37 #include <dev/ofw/openfirm.h>
   38 #include <dev/ofw/ofw_bus.h>
   39 #include <dev/ofw/ofw_bus_subr.h>
   40 
   41 #include <dev/fdt/simplebus.h>
   42 
   43 /*
   44  * Driver for Mediatek/Ralink Palmbus
   45  *
   46  * Currently the only reason for the existence of this driver is so that we can
   47  * minimize the changes required to the upstream DTS files we use.
   48  * Otherwise palmbus is a very simple subclass of our simplebus and the only
   49  * difference between the two is the actual value of the compatible property.
   50  */
   51 
   52 static int
   53 palmbus_probe(device_t dev)
   54 {
   55 
   56         if (!ofw_bus_status_okay(dev))
   57                 return (ENXIO);
   58 
   59         if (!(ofw_bus_is_compatible(dev, "palmbus") &&
   60             ofw_bus_has_prop(dev, "ranges")) &&
   61             (ofw_bus_get_type(dev) == NULL || strcmp(ofw_bus_get_type(dev),
   62             "soc") != 0))
   63                 return (ENXIO);
   64 
   65         device_set_desc(dev, "MTK Palmbus");
   66 
   67         return (0);
   68 }
   69 
   70 static device_method_t palmbus_methods[] = {
   71         DEVMETHOD(device_probe,         palmbus_probe),
   72 
   73         DEVMETHOD_END
   74 };
   75 
   76 DEFINE_CLASS_1(palmbus, palmbus_driver, palmbus_methods,
   77     sizeof(struct simplebus_softc), simplebus_driver);
   78 static devclass_t palmbus_devclass;
   79 EARLY_DRIVER_MODULE(palmbus, ofwbus, palmbus_driver, palmbus_devclass, 0, 0,
   80     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
   81 MODULE_VERSION(palmbus, 1);

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