pswitch.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (C) 2002 Benno Rice.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include "opt_ddb.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kdb.h>
   35 #include <sys/kernel.h>
   36 #include <sys/module.h>
   37 #include <sys/malloc.h>
   38 #include <sys/bus.h>
   39 #include <machine/bus.h>
   40 #include <sys/rman.h>
   41 
   42 #include <machine/resource.h>
   43 
   44 #include <dev/ofw/ofw_bus.h>
   45 #include <dev/ofw/openfirm.h>
   46 
   47 #include <powerpc/powermac/maciovar.h>
   48 
   49 struct pswitch_softc {
   50         int             sc_irq_rid;
   51         struct resource *sc_irq;
   52         void            *sc_ih;
   53 };
   54 
   55 static int      pswitch_probe(device_t);
   56 static int      pswitch_attach(device_t);
   57 
   58 static int      pswitch_intr(void *);
   59 
   60 static device_method_t pswitch_methods[] = {
   61         /* Device interface */
   62         DEVMETHOD(device_probe,         pswitch_probe),
   63         DEVMETHOD(device_attach,        pswitch_attach),
   64         { 0, 0 }
   65 };
   66 
   67 static driver_t pswitch_driver = {
   68         "pswitch",
   69         pswitch_methods,
   70         sizeof(struct pswitch_softc)
   71 };
   72 
   73 EARLY_DRIVER_MODULE(pswitch, macgpio, pswitch_driver, 0, 0, BUS_PASS_RESOURCE);
   74 
   75 static int
   76 pswitch_probe(device_t dev)
   77 {
   78         const char *type = ofw_bus_get_type(dev);
   79 
   80         if (strcmp(type, "programmer-switch") != 0)
   81                 return (ENXIO);
   82 
   83         device_set_desc(dev, "GPIO Programmer's Switch");
   84         return (0);
   85 }
   86 
   87 static int
   88 pswitch_attach(device_t dev)
   89 {
   90         struct          pswitch_softc *sc;
   91 
   92         sc = device_get_softc(dev);
   93 
   94         sc->sc_irq_rid = 0;
   95         sc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
   96             &sc->sc_irq_rid, RF_ACTIVE);
   97         if (sc->sc_irq == NULL) {
   98                 device_printf(dev, "could not allocate interrupt\n");
   99                 return (ENXIO);
  100         }
  101 
  102         if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC | INTR_EXCL,
  103             pswitch_intr, NULL, dev, &sc->sc_ih) != 0) {
  104                 device_printf(dev, "could not setup interrupt\n");
  105                 bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid,
  106                     sc->sc_irq);
  107                 return (ENXIO);
  108         }
  109 
  110         return (0);
  111 }
  112 
  113 static int
  114 pswitch_intr(void *arg)
  115 {
  116         device_t        dev;
  117 
  118         dev = (device_t)arg;
  119 
  120         kdb_enter(KDB_WHY_POWERPC, device_get_nameunit(dev));
  121         return (FILTER_HANDLED);
  122 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powermac/pswitch.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/pswitch.c