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/9/sys/dev/sound/isa/sndbuf_dma.c 193640 2009-06-07 19:12:08Z ariff $");
36
37 int
sndbuf_dmasetup(struct snd_dbuf * b,struct resource * drq)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
sndbuf_dmasetdir(struct snd_dbuf * b,int dir)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
sndbuf_dma(struct snd_dbuf * b,int go)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
sndbuf_dmaptr(struct snd_dbuf * b)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
sndbuf_dmabounce(struct snd_dbuf * b)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 }
108