The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/mpu.c

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    1 /*      $NetBSD: mpu.c,v 1.17 2008/04/28 20:23:50 martin Exp $  */
    2 
    3 /*
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Lennart Augustsson (augustss@NetBSD.org).
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: mpu.c,v 1.17 2008/04/28 20:23:50 martin Exp $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/errno.h>
   38 #include <sys/ioctl.h>
   39 #include <sys/syslog.h>
   40 #include <sys/device.h>
   41 #include <sys/proc.h>
   42 #include <sys/buf.h>
   43 
   44 #include <sys/cpu.h>
   45 #include <sys/intr.h>
   46 #include <sys/bus.h>
   47 
   48 #include <dev/midi_if.h>
   49 
   50 #include <dev/ic/mpuvar.h>
   51 
   52 #ifdef AUDIO_DEBUG
   53 #define DPRINTF(x)      if (mpudebug) printf x
   54 #define DPRINTFN(n,x)   if (mpudebug >= (n)) printf x
   55 int     mpudebug = 0;
   56 #else
   57 #define DPRINTF(x)
   58 #define DPRINTFN(n,x)
   59 #endif
   60 
   61 #define MPU_DATA                0
   62 #define MPU_COMMAND     1
   63 #define  MPU_RESET      0xff
   64 #define  MPU_UART_MODE  0x3f
   65 #define  MPU_ACK                0xfe
   66 #define MPU_STATUS      1
   67 #define  MPU_OUTPUT_BUSY        0x40
   68 #define  MPU_INPUT_EMPTY        0x80
   69 
   70 #define MPU_MAXWAIT     10000   /* usec/10 to wait */
   71 
   72 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
   73 
   74 static int              mpu_reset(struct mpu_softc *);
   75 static  inline int mpu_waitready(struct mpu_softc *);
   76 static void             mpu_readinput(struct mpu_softc *);
   77 
   78 static int      mpu_open(void *, int,
   79                          void (*iintr)(void *, int),
   80                          void (*ointr)(void *), void *arg);
   81 static void     mpu_close(void *);
   82 static int      mpu_output(void *, int);
   83 static void     mpu_getinfo(void *, struct midi_info *);
   84 
   85 const struct midi_hw_if mpu_midi_hw_if = {
   86         mpu_open,
   87         mpu_close,
   88         mpu_output,
   89         mpu_getinfo,
   90         0,                      /* ioctl */
   91 };
   92 
   93 int
   94 mpu_find(struct mpu_softc *sc)
   95 {
   96         if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
   97                 DPRINTF(("%s: No status\n", __func__));
   98                 goto bad;
   99         }
  100         sc->open = 0;
  101         sc->intr = 0;
  102         if (mpu_reset(sc) == 0)
  103                 return 1;
  104 bad:
  105         return 0;
  106 }
  107 
  108 void
  109 mpu_attach(struct mpu_softc *sc)
  110 {
  111         midi_attach_mi(&mpu_midi_hw_if, sc, sc->sc_dev);
  112 }
  113 
  114 static inline int
  115 mpu_waitready(struct mpu_softc *sc)
  116 {
  117         int i;
  118 
  119         for(i = 0; i < MPU_MAXWAIT; i++) {
  120                 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY))
  121                         return 0;
  122                 delay(10);
  123         }
  124         return 1;
  125 }
  126 
  127 static int
  128 mpu_reset(struct mpu_softc *sc)
  129 {
  130         bus_space_tag_t iot = sc->iot;
  131         bus_space_handle_t ioh = sc->ioh;
  132         int i;
  133         int s;
  134 
  135         if (mpu_waitready(sc)) {
  136                 DPRINTF(("%s: not ready\n", __func__));
  137                 return EIO;
  138         }
  139         s = splaudio();         /* Don't let the interrupt get our ACK. */
  140         bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
  141         for(i = 0; i < 2*MPU_MAXWAIT; i++) {
  142                 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
  143                     bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
  144                         splx(s);
  145                         return 0;
  146                 }
  147         }
  148         splx(s);
  149         DPRINTF(("%s: No ACK\n", __func__));
  150         return EIO;
  151 }
  152 
  153 static int
  154 mpu_open(void *addr, int flags, void (*iintr)(void *, int),
  155     void (*ointr)(void *), void *arg)
  156 {
  157         struct mpu_softc *sc = addr;
  158 
  159         DPRINTF(("%s: sc=%p\n", __func__, sc));
  160 
  161         if (sc->open)
  162                 return EBUSY;
  163 #ifndef AUDIO_NO_POWER_CTL
  164         if (sc->powerctl)
  165                 sc->powerctl(sc->powerarg, 1);
  166 #endif
  167         if (mpu_reset(sc) != 0) {
  168 #ifndef AUDIO_NO_POWER_CTL
  169                 if (sc->powerctl)
  170                         sc->powerctl(sc->powerarg, 0);
  171 #endif
  172                 return EIO;
  173         }
  174 
  175         bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE);
  176         sc->open = 1;
  177         sc->intr = iintr;
  178         sc->arg = arg;
  179         return 0;
  180 }
  181 
  182 static void
  183 mpu_close(void *addr)
  184 {
  185         struct mpu_softc *sc = addr;
  186 
  187         DPRINTF(("%s: sc=%p\n", __func__, sc));
  188 
  189         sc->open = 0;
  190         sc->intr = 0;
  191         mpu_reset(sc); /* exit UART mode */
  192 
  193 #ifndef AUDIO_NO_POWER_CTL
  194         if (sc->powerctl)
  195                 sc->powerctl(sc->powerarg, 0);
  196 #endif
  197 }
  198 
  199 static void
  200 mpu_readinput(struct mpu_softc *sc)
  201 {
  202         bus_space_tag_t iot = sc->iot;
  203         bus_space_handle_t ioh = sc->ioh;
  204         int data;
  205 
  206         while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) {
  207                 data = bus_space_read_1(iot, ioh, MPU_DATA);
  208                 DPRINTFN(3, ("%s: sc=%p 0x%02x\n", __func__, sc, data));
  209                 if (sc->intr)
  210                         sc->intr(sc->arg, data);
  211         }
  212 }
  213 
  214 static int
  215 mpu_output(void *addr, int d)
  216 {
  217         struct mpu_softc *sc = addr;
  218         int s;
  219 
  220         DPRINTFN(3, ("%s: sc=%p 0x%02x\n", __func__, sc, d));
  221         if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
  222                 s = splaudio();
  223                 mpu_readinput(sc);
  224                 splx(s);
  225         }
  226         if (mpu_waitready(sc)) {
  227                 DPRINTF(("%s:: not ready\n", __func__));
  228                 return EIO;
  229         }
  230         bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
  231         return 0;
  232 }
  233 
  234 static void
  235 mpu_getinfo(void *addr, struct midi_info *mi)
  236 {
  237         struct mpu_softc *sc = addr;
  238 
  239         mi->name = sc->model;
  240         mi->props = 0;
  241 }
  242 
  243 int
  244 mpu_intr(void *addr)
  245 {
  246         struct mpu_softc *sc = addr;
  247 
  248         if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
  249                 DPRINTF(("%s: no data\n", __func__));
  250                 return 0;
  251         } else {
  252                 mpu_readinput(sc);
  253                 return 1;
  254         }
  255 }

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