FreeBSD/Linux Kernel Cross Reference
sys/dev/cfe/cfe_resource.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2007 Bruce M. Simpson.
      * 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.
     */
    
    /*
     * Driver to swallow up memory ranges reserved by CFE platform firmware.
     * CFE on Sentry5 doesn't specify reserved ranges, so this is not useful
     * at the present time.
     * TODO: Don't attach this off nexus.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/socket.h>
    
    #include <sys/module.h>
    #include <sys/bus.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    #include <sys/rman.h>
    
    #include <dev/cfe/cfe_api.h>
    #include <dev/cfe/cfe_error.h>
    
    #define MAX_CFE_RESERVATIONS 16
    
    struct cferes_softc {
            int              rnum;
            int              rid[MAX_CFE_RESERVATIONS];
            struct resource *res[MAX_CFE_RESERVATIONS];
    };
    
    static int
    cferes_probe(device_t dev)
    {
    
            return (BUS_PROBE_NOWILDCARD);
    }
    
    static int
    cferes_attach(device_t dev)
    {
    
            return (0);
    }
    
    static void
    cferes_identify(driver_t* driver, device_t parent)
    {
            device_t                 child;
            int                      i;
            struct resource         *res;
            int                      result;
            int                      rid;
            struct cferes_softc     *sc;
            uint64_t                 addr, len, type;
    
            child = BUS_ADD_CHILD(parent, 100, "cferes", -1);
            device_set_driver(child, driver);
            sc = device_get_softc(child);
    
            sc->rnum = 0;
            for (i = 0; i < ~0U; i++) {
                    result = cfe_enummem(i, CFE_FLG_FULL_ARENA, &addr, &len, &type);
                    if (result < 0)
                            break;
                    if (type != CFE_MI_RESERVED) {
                            if (bootverbose)
                            printf("%s: skipping non reserved range 0x%0jx(%jd)\n",
                                device_getnameunit(child),
                               (uintmax_t)addr, (uintmax_t)len);
                           continue;
                   }
   
                   bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, addr, len);
                   rid = sc->rnum;
                   res = bus_alloc_resource_any(child, SYS_RES_MEMORY, &rid, 0);
                   if (res == NULL) {
                           bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
                           continue;
                   }
                   sc->rid[sc->rnum] = rid;
                   sc->res[sc->rnum] = res;
   
                   sc->rnum++;
                   if (sc->rnum == MAX_CFE_RESERVATIONS)
                           break;
           }
   
           if (sc->rnum == 0) {
                   device_delete_child(parent, child);
                   return;
           }
   
           device_set_desc(child, "CFE reserved memory");
   }
   
   static int
   cferes_detach(device_t dev)
   {
           int                     i;
           struct cferes_softc     *sc = device_get_softc(dev);
   
           for (i = 0; i < sc->rnum; i++) {
                   bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
                       sc->res[i]);
           }
   
           return (0);
   }
   
   static device_method_t cferes_methods[] = {
           /* Device interface */
           DEVMETHOD(device_identify,      cferes_identify),
           DEVMETHOD(device_probe,         cferes_probe),
           DEVMETHOD(device_attach,        cferes_attach),
           DEVMETHOD(device_detach,        cferes_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
           { 0, 0 }
   };
   
   static driver_t cferes_driver = {
           "cferes",
           cferes_methods,
           sizeof (struct cferes_softc)
   };
   
   static devclass_t cferes_devclass;
   
   DRIVER_MODULE(cfe, nexus, cferes_driver, cferes_devclass, 0, 0);

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