The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/mpu_isa.c

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    1 /*      $OpenBSD: mpu_isa.c,v 1.8 2022/04/06 18:59:28 naddy Exp $       */
    2 
    3 /*
    4  * Copyright (c) 2002 Sergey Smitienko. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   27  * OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/errno.h>
   33 #include <sys/ioctl.h>
   34 #include <sys/syslog.h>
   35 #include <sys/device.h>
   36 
   37 #include <machine/bus.h>
   38 
   39 #include <sys/audioio.h>
   40 #include <dev/midi_if.h>
   41 
   42 #include <dev/isa/isavar.h>
   43 #include <dev/isa/isadmavar.h>
   44 
   45 #include <dev/ic/mpuvar.h>
   46 
   47 int     mpu_isa_match(struct device *, void *, void *);
   48 void    mpu_isa_attach(struct device *, struct device *, void *);
   49 int     mpu_test(bus_space_tag_t, int);
   50 
   51 #ifdef  AUDIO_DEBUG
   52 #define DPRINTF(x)      if (mpu_debug) printf x
   53 int     mpu_debug = 0;
   54 #else
   55 #define DPRINTF(x)
   56 #endif
   57 
   58 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
   59 
   60 struct mpu_isa_softc {
   61         struct device sc_dev;
   62 
   63         struct mpu_softc sc_mpu;
   64 };
   65 
   66 const struct cfattach mpu_isa_ca = {
   67         sizeof(struct mpu_isa_softc), mpu_isa_match, mpu_isa_attach
   68 };
   69 
   70 int
   71 mpu_test(bus_space_tag_t iot, int iobase)       /* base port number to try */
   72 {
   73         bus_space_handle_t ioh;
   74         int     i, rc;
   75 
   76         rc = 0;
   77         if (bus_space_map(iot, iobase, MPU401_NPORT, 0, &ioh)) {
   78                 DPRINTF(("mpu_test: can't map: %x/2\n", iobase));
   79                 return (0);
   80         }
   81 
   82         DPRINTF(("mpu_test: trying: %x\n", iobase));
   83 
   84         /*
   85          * The following code is a shameless copy of mpu401.c
   86          * it is here until a redesign of mpu_find() interface
   87          */
   88 
   89         if (MPU_GETSTATUS(iot, ioh) == 0xff)
   90                 goto done;
   91 
   92         for (i = 0; i < MPU_MAXWAIT; i++) {
   93                 if (!(MPU_GETSTATUS(iot, ioh) & MPU_OUTPUT_BUSY)) {
   94                         rc = 1;
   95                         break;
   96                 }
   97                 delay (10);
   98         }
   99         
  100         if (rc == 1) {  
  101                 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
  102                 rc = 0;
  103                 for (i = 0; i < 2 * MPU_MAXWAIT; i++)
  104                         if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
  105                             bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
  106                                 rc = 1;
  107                                 break;
  108                         }
  109         }
  110 done:
  111         bus_space_unmap(iot, ioh, MPU401_NPORT);
  112 
  113         return (rc);
  114 }
  115 
  116 int
  117 mpu_isa_match(struct device *parent, void *match, void *aux)
  118 {
  119         struct isa_attach_args *ia = aux;
  120 
  121         if (mpu_test(ia->ia_iot, ia->ia_iobase)) {
  122                 ia->ia_iosize = MPU401_NPORT;
  123                 return (1);
  124         }
  125 
  126         return (0);
  127 }
  128 
  129 void
  130 mpu_isa_attach(struct device *parent, struct device *self, void *aux)
  131 {
  132         struct mpu_isa_softc *sc = (struct mpu_isa_softc *)self;
  133         struct isa_attach_args *ia = aux;
  134 
  135         sc->sc_mpu.iot = ia->ia_iot;
  136 
  137         if (bus_space_map (ia->ia_iot, ia->ia_iobase, MPU401_NPORT,
  138             0, &sc->sc_mpu.ioh)) {
  139                 printf(": can't map i/o space\n");
  140                 return;
  141         }
  142 
  143         if (!mpu_find(&sc->sc_mpu)) {
  144                 printf(": find failed\n");
  145                 return;
  146         }
  147 
  148         printf(": generic MPU-401 compatible\n");
  149 
  150         midi_attach_mi(&mpu_midi_hw_if, &sc->sc_mpu, &sc->sc_dev);
  151 }

Cache object: 0f29129b13382a73c0f1ac64bea3e85f


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