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/sound/isa/sndbuf_dma.c

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    1 /*-
    2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 
   29 #include <isa/isavar.h>
   30 
   31 SND_DECLARE_FILE("$FreeBSD: releng/5.4/sys/dev/sound/isa/sndbuf_dma.c 141016 2005-01-30 01:00:13Z imp $");
   32 
   33 int
   34 sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq)
   35 {
   36         /* should do isa_dma_acquire/isa_dma_release here */
   37         if (drq == NULL) {
   38                 b->dmachan = -1;
   39         } else {
   40                 sndbuf_setflags(b, SNDBUF_F_DMA, 1);
   41                 b->dmachan = rman_get_start(drq);
   42         }
   43         return 0;
   44 }
   45 
   46 int
   47 sndbuf_dmasetdir(struct snd_dbuf *b, int dir)
   48 {
   49         KASSERT(b, ("sndbuf_dmasetdir called with b == NULL"));
   50         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmasetdir called on non-ISA buffer"));
   51 
   52         b->dir = (dir == PCMDIR_PLAY)? ISADMA_WRITE : ISADMA_READ;
   53         return 0;
   54 }
   55 
   56 void
   57 sndbuf_dma(struct snd_dbuf *b, int go)
   58 {
   59         KASSERT(b, ("sndbuf_dma called with b == NULL"));
   60         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dma called on non-ISA buffer"));
   61 
   62         switch (go) {
   63         case PCMTRIG_START:
   64                 /* isa_dmainit(b->chan, size); */
   65                 isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
   66                 break;
   67 
   68         case PCMTRIG_STOP:
   69         case PCMTRIG_ABORT:
   70                 isa_dmastop(b->dmachan);
   71                 isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
   72                 break;
   73         }
   74 
   75         DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
   76                 b,
   77                 (go == PCMTRIG_START)? "started" : "stopped",
   78                 b->dmachan));
   79 }
   80 
   81 int
   82 sndbuf_dmaptr(struct snd_dbuf *b)
   83 {
   84         int i;
   85 
   86         KASSERT(b, ("sndbuf_dmaptr called with b == NULL"));
   87         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmaptr called on non-ISA buffer"));
   88 
   89         if (!sndbuf_runsz(b))
   90                 return 0;
   91         i = isa_dmastatus(b->dmachan);
   92         KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
   93         return b->bufsize - i;
   94 }
   95 
   96 void
   97 sndbuf_dmabounce(struct snd_dbuf *b)
   98 {
   99         KASSERT(b, ("sndbuf_dmabounce called with b == NULL"));
  100         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmabounce called on non-ISA buffer"));
  101 
  102         /* tell isa_dma to bounce data in/out */
  103 }

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