1/*	$NetBSD: scu.h,v 1.1.1.1 1995/03/26 07:12:08 leo Exp $	*/
2
3/*
4 * Copyright (c) 1995 Leo Weppelman.
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 ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _MACHINE_SCU_H
29#define _MACHINE_SCU_H
30/*
31 * Atari TT hardware:
32 * SCU registers
33 */
34
35#define	SCU	((struct scu *)AD_SCU)
36
37
38/*
39 * System control unit
40 */
41struct scu {
42	volatile u_char	fil1;
43	volatile u_char	sys_mask;	/* System interrupt mask	*/
44	volatile u_char	fil2;
45	volatile u_char	sys_stat;	/* System interrupt status	*/
46	volatile u_char	fil3;
47	volatile u_char	sys_int;	/* System interrupter		*/
48	volatile u_char	fil4;
49	volatile u_char	vme_int;	/* VME interrupter		*/
50	volatile u_char	fil5;
51	volatile u_char	gen_reg1;	/* General purpose reg. 1	*/
52	volatile u_char	fil6;
53	volatile u_char	gen_reg2;	/* General purpose reg. 2	*/
54	volatile u_char	fil7;
55	volatile u_char	vme_mask;	/* VME interrupt mask		*/
56	volatile u_char	fil8;
57	volatile u_char	vme_stat;	/* VME interrupt status		*/
58};
59
60/*
61 * Bits for system mask & stat.
62 * Read 'sys_stat' first, reading 'sys_mask' clears pending bits in 'sys_stat'.
63 */
64#define	SCU_SYSFAIL	0x80	/* _Sysfail in VME bus (Auto vectored)	*/
65#define	SCU_MFP		0x40	/* MFP interrupt (Programmable)		*/
66#define	SCU_SCC		0x20	/* SCC interrupt (Programmable)		*/
67#define	SCU_VSYNC	0x10	/* Vertical Sync (Auto vectored)	*/
68		     /* 0x08 Not Used */
69#define	SCU_HSYNC	0x04	/* Horizontal Sync (Auto vectored)	*/
70#define	SCU_SYS_SOFT	0x02	/* System Software INT (Auto vectored)	*/
71		     /* 0x00 Not Used */
72
73/*
74 * Bits for VME mask & stat.
75 * Read 'vme_stat' first, reading 'vme_mask' clears pending bits in 'vme_stat'.
76 * Not that MFP/SCC interrupts are hard-wired to the mentioned VME IRQ's.
77 * (or'ed).
78 */
79#define	SCU_IRQ7	0x80
80#define	SCU_IQ6_MFP	0x40	/* Also MFP interrupt			*/
81#define	SCU_IRQ5_SCC	0x20	/* Also SCC interrupt			*/
82#define	SCU_IRQ4	0x10
83#define	SCU_IRQ3_SOFT	0x08	/* Also VME Software interrupt		*/
84#define	SCU_IRQ2	0x04
85#define	SCU_IRQ1	0x02
86		     /* 0x00 Not Used */
87
88/*
89 * Generate/remove Software system interrupt.
90 * Note: Will not be cleared automatically!!
91 */
92#define	SET_SOFT_INT	(SCU->sys_int = 1)
93#define	CLR_SOFT_INT	(SCU->sys_int = 0)
94
95/*
96 * Generate/remove Software VME interrupt.
97 * Note: Will not be cleared automatically!!
98 */
99#define	SET_VME_INT	(SCU->vme_int = 1)
100#define	CLR_VME_INT	(SCU->vme_int = 0)
101#endif /* _MACHINE_SCU_H */
102