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
35SND_DECLARE_FILE("$FreeBSD$");
36
37int
38sndbuf_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
50int
51sndbuf_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
60void
61sndbuf_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
85int
86sndbuf_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
100void
101sndbuf_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