1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
37SND_DECLARE_FILE("$FreeBSD$");
38
39int
40sndbuf_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
52int
53sndbuf_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
62void
63sndbuf_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
87int
88sndbuf_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
102void
103sndbuf_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