text: /*-
   * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifdef HAVE_KERNEL_OPTION_HEADERS
  #include "opt_snd.h"
  #endif
  
  #include <dev/sound/pcm/sound.h>
  
  #include <isa/isavar.h>
  
  SND_DECLARE_FILE("$FreeBSD: soc2013/dpl/head/sys/dev/sound/isa/sndbuf_dma.c 193683 2009-06-07 19:12:08Z ariff $");
  
  int
  sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq)
  {
  	/* should do isa_dma_acquire/isa_dma_release here */
  	if (drq == NULL) {
  		b->dmachan = -1;
  	} else {
  		sndbuf_setflags(b, SNDBUF_F_DMA, 1);
  		b->dmachan = rman_get_start(drq);
  	}
  	return 0;
  }
  
  int
  sndbuf_dmasetdir(struct snd_dbuf *b, int dir)
  {
  	KASSERT(b, ("sndbuf_dmasetdir called with b == NULL"));
  	KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmasetdir called on non-ISA buffer"));
  
  	b->dir = (dir == PCMDIR_PLAY)? ISADMA_WRITE : ISADMA_READ;
  	return 0;
  }
  
  void
  sndbuf_dma(struct snd_dbuf *b, int go)
  {
  	KASSERT(b, ("sndbuf_dma called with b == NULL"));
  	KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dma called on non-ISA buffer"));
  
  	switch (go) {
  	case PCMTRIG_START:
  		/* isa_dmainit(b->chan, size); */
  		isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
  		break;
  
  	case PCMTRIG_STOP:
  	case PCMTRIG_ABORT:
  		isa_dmastop(b->dmachan);
  		isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
  		break;
  	}
  
  	DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
  		b,
  		(go == PCMTRIG_START)? "started" : "stopped",
  		b->dmachan));
  }
  
  int
  sndbuf_dmaptr(struct snd_dbuf *b)
  {
  	int i;
  
  	KASSERT(b, ("sndbuf_dmaptr called with b == NULL"));
  	KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmaptr called on non-ISA buffer"));
  
  	if (!sndbuf_runsz(b))
  		return 0;
  	i = isa_dmastatus(b->dmachan);
  	KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
  	return b->bufsize - i;
  }
  
  void
  sndbuf_dmabounce(struct snd_dbuf *b)
  {
  	KASSERT(b, ("sndbuf_dmabounce called with b == NULL"));
  	KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmabounce called on non-ISA buffer"));
  
  	/* tell isa_dma to bounce data in/out */
  }
  