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scu.h revision 1.1 
      1 /*	$NetBSD: scu.h,v 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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Leo Weppelman.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _MACHINE_SCU_H
     34 #define _MACHINE_SCU_H
     35 /*
     36  * Atari TT hardware:
     37  * SCU registers
     38  */
     39 
     40 #define	SCU	((struct scu *)AD_SCU)
     41 
     42 
     43 /*
     44  * System control unit
     45  */
     46 struct scu {
     47 	volatile u_char	fil1;
     48 	volatile u_char	sys_mask;	/* System interrupt mask	*/
     49 	volatile u_char	fil2;
     50 	volatile u_char	sys_stat;	/* System interrupt status	*/
     51 	volatile u_char	fil3;
     52 	volatile u_char	sys_int;	/* System interrupter		*/
     53 	volatile u_char	fil4;
     54 	volatile u_char	vme_int;	/* VME interrupter		*/
     55 	volatile u_char	fil5;
     56 	volatile u_char	gen_reg1;	/* General purpose reg. 1	*/
     57 	volatile u_char	fil6;
     58 	volatile u_char	gen_reg2;	/* General purpose reg. 2	*/
     59 	volatile u_char	fil7;
     60 	volatile u_char	vme_mask;	/* VME interrupt mask		*/
     61 	volatile u_char	fil8;
     62 	volatile u_char	vme_stat;	/* VME interrupt status		*/
     63 };
     64 
     65 /*
     66  * Bits for system mask & stat.
     67  * Read 'sys_stat' first, reading 'sys_mask' clears pending bits in 'sys_stat'.
     68  */
     69 #define	SCU_SYSFAIL	0x80	/* _Sysfail in VME bus (Auto vectored)	*/
     70 #define	SCU_MFP		0x40	/* MFP interrupt (Programmable)		*/
     71 #define	SCU_SCC		0x20	/* SCC interrupt (Programmable)		*/
     72 #define	SCU_VSYNC	0x10	/* Vertical Sync (Auto vectored)	*/
     73 		     /* 0x08 Not Used */
     74 #define	SCU_HSYNC	0x04	/* Horizontal Sync (Auto vectored)	*/
     75 #define	SCU_SYS_SOFT	0x02	/* System Software INT (Auto vectored)	*/
     76 		     /* 0x00 Not Used */
     77 
     78 /*
     79  * Bits for VME mask & stat.
     80  * Read 'vme_stat' first, reading 'vme_mask' clears pending bits in 'vme_stat'.
     81  * Not that MFP/SCC interrupts are hard-wired to the mentioned VME IRQ's.
     82  * (or'ed).
     83  */
     84 #define	SCU_IRQ7	0x80
     85 #define	SCU_IQ6_MFP	0x40	/* Also MFP interrupt			*/
     86 #define	SCU_IRQ5_SCC	0x20	/* Also SCC interrupt			*/
     87 #define	SCU_IRQ4	0x10
     88 #define	SCU_IRQ3_SOFT	0x08	/* Also VME Software interrupt		*/
     89 #define	SCU_IRQ2	0x04
     90 #define	SCU_IRQ1	0x02
     91 		     /* 0x00 Not Used */
     92 
     93 /*
     94  * Generate/remove Software system interrupt.
     95  * Note: Will not be cleared automatically!!
     96  */
     97 #define	SET_SOFT_INT	(SCU->sys_int = 1)
     98 #define	CLR_SOFT_INT	(SCU->sys_int = 0)
     99 
    100 /*
    101  * Generate/remove Software VME interrupt.
    102  * Note: Will not be cleared automatically!!
    103  */
    104 #define	SET_VME_INT	(SCU->vme_int = 1)
    105 #define	CLR_VME_INT	(SCU->vme_int = 0)
    106 #endif /* _MACHINE_SCU_H */
    107