FreeBSD/Linux Kernel Cross Reference
sys/arm/annapurna/alpine/alpine_nb_service.c

     /*-
      * Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
      * All rights reserved.
      *
      * Developed by Semihalf.
      *
      * 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/conf.h>
    #include <sys/rman.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/resource.h>
    #include <sys/systm.h>
    
    #include <machine/bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #define AL_NB_ACF_MISC_OFFSET                   0xD0
    #define AL_NB_ACF_MISC_READ_BYPASS              (1 << 30)
    
    static struct resource_spec nb_service_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    struct nb_service_softc {
            struct resource *res;
    };
    
    static int nb_service_probe(device_t dev);
    static int nb_service_attach(device_t dev);
    static int nb_service_detach(device_t dev);
    
    static device_method_t nb_service_methods[] = {
            DEVMETHOD(device_probe,         nb_service_probe),
            DEVMETHOD(device_attach,        nb_service_attach),
            DEVMETHOD(device_detach,        nb_service_detach),
            { 0, 0 }
    };
    
    static driver_t nb_service_driver = {
            "nb_service",
            nb_service_methods,
            sizeof(struct nb_service_softc)
    };
    
    EARLY_DRIVER_MODULE(nb_service, simplebus, nb_service_driver, 0, 0,
        BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
    EARLY_DRIVER_MODULE(nb_service, ofwbus, nb_service_driver, 0, 0,
        BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
    
    static int
    nb_service_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-nb-service"))
                    return (ENXIO);
    
            device_set_desc(dev, "Alpine North Bridge Service");
    
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    nb_service_attach(device_t dev)
    {
            struct nb_service_softc *sc;
            uint32_t val;
            int err;
    
           sc = device_get_softc(dev);
   
           err = bus_alloc_resources(dev, nb_service_spec, &sc->res);
           if (err != 0) {
                   device_printf(dev, "could not allocate resources\n");
                   return (err);
           }
   
           /* Do not allow reads to bypass writes to different addresses */
           val = bus_read_4(sc->res, AL_NB_ACF_MISC_OFFSET);
           val &= ~AL_NB_ACF_MISC_READ_BYPASS;
           bus_write_4(sc->res, AL_NB_ACF_MISC_OFFSET, val);
   
           return (0);
   }
   
   static int
   nb_service_detach(device_t dev)
   {
           struct nb_service_softc *sc;
   
           sc = device_get_softc(dev);
   
           bus_release_resources(dev, nb_service_spec, &sc->res);
   
           return (0);
   }

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