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/6.4/sys/dev/sound/isa/sndbuf_dma.c 139749 2005-01-06 01:43:34Z 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 }
Cache object: 1d82f691ce3084659e1ee668cb8a31d3
|