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 #ifdef HAVE_KERNEL_OPTION_HEADERS
   28 #include "opt_snd.h"
   29 #endif
   30 
   31 #include <dev/sound/pcm/sound.h>
   32 
   33 #include <isa/isavar.h>
   34 
   35 SND_DECLARE_FILE("$FreeBSD: stable/11/sys/dev/sound/isa/sndbuf_dma.c 331722 2018-03-29 02:50:57Z eadler $");
   36 
   37 int
   38 sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq)
   39 {
   40         /* should do isa_dma_acquire/isa_dma_release here */
   41         if (drq == NULL) {
   42                 b->dmachan = -1;
   43         } else {
   44                 sndbuf_setflags(b, SNDBUF_F_DMA, 1);
   45                 b->dmachan = rman_get_start(drq);
   46         }
   47         return 0;
   48 }
   49 
   50 int
   51 sndbuf_dmasetdir(struct snd_dbuf *b, int dir)
   52 {
   53         KASSERT(b, ("sndbuf_dmasetdir called with b == NULL"));
   54         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmasetdir called on non-ISA buffer"));
   55 
   56         b->dir = (dir == PCMDIR_PLAY)? ISADMA_WRITE : ISADMA_READ;
   57         return 0;
   58 }
   59 
   60 void
   61 sndbuf_dma(struct snd_dbuf *b, int go)
   62 {
   63         KASSERT(b, ("sndbuf_dma called with b == NULL"));
   64         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dma called on non-ISA buffer"));
   65 
   66         switch (go) {
   67         case PCMTRIG_START:
   68                 /* isa_dmainit(b->chan, size); */
   69                 isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
   70                 break;
   71 
   72         case PCMTRIG_STOP:
   73         case PCMTRIG_ABORT:
   74                 isa_dmastop(b->dmachan);
   75                 isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
   76                 break;
   77         }
   78 
   79         DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
   80                 b,
   81                 (go == PCMTRIG_START)? "started" : "stopped",
   82                 b->dmachan));
   83 }
   84 
   85 int
   86 sndbuf_dmaptr(struct snd_dbuf *b)
   87 {
   88         int i;
   89 
   90         KASSERT(b, ("sndbuf_dmaptr called with b == NULL"));
   91         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmaptr called on non-ISA buffer"));
   92 
   93         if (!sndbuf_runsz(b))
   94                 return 0;
   95         i = isa_dmastatus(b->dmachan);
   96         KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
   97         return b->bufsize - i;
   98 }
   99 
  100 void
  101 sndbuf_dmabounce(struct snd_dbuf *b)
  102 {
  103         KASSERT(b, ("sndbuf_dmabounce called with b == NULL"));
  104         KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmabounce called on non-ISA buffer"));
  105 
  106         /* tell isa_dma to bounce data in/out */
  107 }

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