1/*	$NetBSD: iomd_dma.h,v 1.2 2002/02/18 11:41:18 bjh21 Exp $	*/
2
3/*
4 * Copyright (c) 1997 Scott Stevens
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Scott Stevens.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *      @(#)dmavar.h
34 */
35
36/*
37 * dma structures
38 */
39
40struct dma_ctrl {
41	int			dc_flags;
42	int			dc_channel;
43	int			dc_dmasize;
44	volatile u_int		*dc_cura;
45	volatile u_int		*dc_enda;
46	volatile u_int		*dc_curb;
47	volatile u_int		*dc_endb;
48	volatile u_char		*dc_cr;
49	volatile u_char		*dc_st;
50
51	u_char			*dc_nextaddr;
52	int			dc_len;
53
54	irqhandler_t		dc_ih;
55};
56
57#define DMA_FL_ACTIVE	0x01
58#define DMA_FL_READY	0x02
59
60#define DMA_CR_CLEAR	0x80
61#define DMA_CR_DIR	0x40
62#define DMA_CR_ENABLE	0x20
63#define DMA_CR_INC	0x1f
64
65#define DMA_ST_CHAN	0x01
66#define DMA_ST_INT	0x02
67#define DMA_ST_OVER	0x04
68#define DMA_ST_MASK	(DMA_ST_CHAN | DMA_ST_INT | DMA_ST_OVER)
69
70#define DMA_END_STOP	0x80000000
71#define DMA_END_LAST	0x40000000
72
73/* Prototypes */
74struct dma_ctrl *dma_init(int, int, int, int);
75void dma_go(struct dma_ctrl *);
76int dma_reset(struct dma_ctrl *);
77int dma_setup(struct dma_ctrl *, u_char *, int, int);
78int dma_isactive(struct dma_ctrl *);
79int dma_isintr(struct dma_ctrl *);
80int dma_intr(void *);
81