FreeBSD/Linux Kernel Cross Reference
sys/dev/terasic/de4led/terasic_de4led_nexus.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2012 Robert N. M. Watson
      * 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.
     *
     * 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/bus.h>
    #include <sys/condvar.h>
    #include <sys/conf.h>
    #include <sys/bio.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    #include <sys/systm.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <dev/terasic/de4led/terasic_de4led.h>
    
    /*
     * Nexus bus attachment for the 8-element LED on the Terasic DE-4 FPGA board,
     * which is hooked up to the processor via a memory-mapped Avalon bus.
     */
    static int
    terasic_de4led_nexus_probe(device_t dev)
    {
    
            device_set_desc(dev, "Terasic DE4 8-element LED");
            return (BUS_PROBE_NOWILDCARD);
    }
    
    static int
    terasic_de4led_nexus_attach(device_t dev)
    {
            struct terasic_de4led_softc *sc;
    
            sc = device_get_softc(dev);
            sc->tdl_dev = dev;
            sc->tdl_unit = device_get_unit(dev);
            sc->tdl_rid = 0;
            sc->tdl_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
                &sc->tdl_rid, RF_ACTIVE);
            if (sc->tdl_res == NULL) {
                    device_printf(dev, "couldn't map memory\n");
                    return (ENXIO);
            }
            terasic_de4led_attach(sc);
            return (0);
    }
    
    static int
    terasic_de4led_nexus_detach(device_t dev)
    {
            struct terasic_de4led_softc *sc;
    
            sc = device_get_softc(dev);
            KASSERT(sc->tdl_res != NULL, ("%s: resources not allocated",
                __func__));
            terasic_de4led_detach(sc);
            bus_release_resource(dev, SYS_RES_MEMORY, sc->tdl_rid, sc->tdl_res);
            return (0);
    }
    
    static device_method_t terasic_de4led_nexus_methods[] = {
            DEVMETHOD(device_probe,         terasic_de4led_nexus_probe),
           DEVMETHOD(device_attach,        terasic_de4led_nexus_attach),
           DEVMETHOD(device_detach,        terasic_de4led_nexus_detach),
           { 0, 0 }
   };
   
   static driver_t terasic_de4led_nexus_driver = {
           "terasic_de4led",
           terasic_de4led_nexus_methods,
           sizeof(struct terasic_de4led_softc),
   };
   
   DRIVER_MODULE(terasic_de4led, nexus, terasic_de4led_nexus_driver,
       terasic_de4led_devclass, 0, 0);

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