FreeBSD/Linux Kernel Cross Reference
sys/arm64/coresight/coresight_replicator.c

     /*-
      * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * This software was developed by BAE Systems, the University of Cambridge
      * Computer Laboratory, and Memorial University under DARPA/AFRL contract
      * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
      * (TC) research program.
      *
     * 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/bus.h>
    #include <sys/rman.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <machine/bus.h>
    
    #include <arm64/coresight/coresight.h>
    #include <arm64/coresight/coresight_replicator.h>
    
    #include "coresight_if.h"
    
    static struct resource_spec replicator_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    static int
    replicator_init(device_t dev)
    {
            struct replicator_softc *sc;
    
            sc = device_get_softc(dev);
    
            /* Unlock Coresight */
            bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
    
            return (0);
    }
    
    static int
    replicator_enable(device_t dev, struct endpoint *endp,
        struct coresight_event *event)
    {
            struct replicator_softc *sc;
    
            sc = device_get_softc(dev);
    
            /* Enable the port. Keep the other port disabled */
            if (endp->reg == 0) {
                    bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0x00);
                    bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
            } else {
                    bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
                    bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0x00);
            }
    
            return (0);
    }
    
    static void
    replicator_disable(device_t dev, struct endpoint *endp,
        struct coresight_event *event)
    {
            struct replicator_softc *sc;
    
            sc = device_get_softc(dev);
    
            bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
            bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
    }
    
    int
    replicator_attach(device_t dev)
   {
           struct replicator_softc *sc;
           struct coresight_desc desc;
   
           sc = device_get_softc(dev);
   
           if (bus_alloc_resources(dev, replicator_spec, &sc->res) != 0) {
                   device_printf(dev, "cannot allocate resources for device\n");
                   return (ENXIO);
           }
   
           desc.pdata = sc->pdata;
           desc.dev = dev;
           desc.dev_type = CORESIGHT_DYNAMIC_REPLICATOR;
           coresight_register(&desc);
   
           return (0);
   }
   
   static device_method_t replicator_methods[] = {
           /* Coresight interface */
           DEVMETHOD(coresight_init,       replicator_init),
           DEVMETHOD(coresight_enable,     replicator_enable),
           DEVMETHOD(coresight_disable,    replicator_disable),
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_0(replicator, replicator_driver, replicator_methods,
       sizeof(struct replicator_softc));

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