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      1 /*	$NetBSD: scu.h,v 1.2 2009/10/20 19:10:11 snj 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  */
     41 struct 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