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