1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifdef HAVE_KERNEL_OPTION_HEADERS
30 #include "opt_snd.h"
31 #endif
32
33 #include <dev/sound/pcm/sound.h>
34
35 #include <isa/isavar.h>
36
37 SND_DECLARE_FILE("");
38
39 int
sndbuf_dmasetup(struct snd_dbuf * b,struct resource * drq)40 sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq)
41 {
42 /* should do isa_dma_acquire/isa_dma_release here */
43 if (drq == NULL) {
44 b->dmachan = -1;
45 } else {
46 sndbuf_setflags(b, SNDBUF_F_DMA, 1);
47 b->dmachan = rman_get_start(drq);
48 }
49 return 0;
50 }
51
52 int
sndbuf_dmasetdir(struct snd_dbuf * b,int dir)53 sndbuf_dmasetdir(struct snd_dbuf *b, int dir)
54 {
55 KASSERT(b, ("sndbuf_dmasetdir called with b == NULL"));
56 KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmasetdir called on non-ISA buffer"));
57
58 b->dir = (dir == PCMDIR_PLAY)? ISADMA_WRITE : ISADMA_READ;
59 return 0;
60 }
61
62 void
sndbuf_dma(struct snd_dbuf * b,int go)63 sndbuf_dma(struct snd_dbuf *b, int go)
64 {
65 KASSERT(b, ("sndbuf_dma called with b == NULL"));
66 KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dma called on non-ISA buffer"));
67
68 switch (go) {
69 case PCMTRIG_START:
70 /* isa_dmainit(b->chan, size); */
71 isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
72 break;
73
74 case PCMTRIG_STOP:
75 case PCMTRIG_ABORT:
76 isa_dmastop(b->dmachan);
77 isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->dmachan);
78 break;
79 }
80
81 DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
82 b,
83 (go == PCMTRIG_START)? "started" : "stopped",
84 b->dmachan));
85 }
86
87 int
sndbuf_dmaptr(struct snd_dbuf * b)88 sndbuf_dmaptr(struct snd_dbuf *b)
89 {
90 int i;
91
92 KASSERT(b, ("sndbuf_dmaptr called with b == NULL"));
93 KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmaptr called on non-ISA buffer"));
94
95 if (!sndbuf_runsz(b))
96 return 0;
97 i = isa_dmastatus(b->dmachan);
98 KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
99 return b->bufsize - i;
100 }
101
102 void
sndbuf_dmabounce(struct snd_dbuf * b)103 sndbuf_dmabounce(struct snd_dbuf *b)
104 {
105 KASSERT(b, ("sndbuf_dmabounce called with b == NULL"));
106 KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmabounce called on non-ISA buffer"));
107
108 /* tell isa_dma to bounce data in/out */
109 }
110