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/* $NetBSD: scu.h,v 1.1.1.1 1995/03/26 07:12:08 leo Exp $ */
/*
* Copyright (c) 1995 Leo Weppelman.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Leo Weppelman.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MACHINE_SCU_H
#define _MACHINE_SCU_H
/*
* Atari TT hardware:
* SCU registers
*/
#define SCU ((struct scu *)AD_SCU)
/*
* System control unit
*/
struct scu {
volatile u_char fil1;
volatile u_char sys_mask; /* System interrupt mask */
volatile u_char fil2;
volatile u_char sys_stat; /* System interrupt status */
volatile u_char fil3;
volatile u_char sys_int; /* System interrupter */
volatile u_char fil4;
volatile u_char vme_int; /* VME interrupter */
volatile u_char fil5;
volatile u_char gen_reg1; /* General purpose reg. 1 */
volatile u_char fil6;
volatile u_char gen_reg2; /* General purpose reg. 2 */
volatile u_char fil7;
volatile u_char vme_mask; /* VME interrupt mask */
volatile u_char fil8;
volatile u_char vme_stat; /* VME interrupt status */
};
/*
* Bits for system mask & stat.
* Read 'sys_stat' first, reading 'sys_mask' clears pending bits in 'sys_stat'.
*/
#define SCU_SYSFAIL 0x80 /* _Sysfail in VME bus (Auto vectored) */
#define SCU_MFP 0x40 /* MFP interrupt (Programmable) */
#define SCU_SCC 0x20 /* SCC interrupt (Programmable) */
#define SCU_VSYNC 0x10 /* Vertical Sync (Auto vectored) */
/* 0x08 Not Used */
#define SCU_HSYNC 0x04 /* Horizontal Sync (Auto vectored) */
#define SCU_SYS_SOFT 0x02 /* System Software INT (Auto vectored) */
/* 0x00 Not Used */
/*
* Bits for VME mask & stat.
* Read 'vme_stat' first, reading 'vme_mask' clears pending bits in 'vme_stat'.
* Not that MFP/SCC interrupts are hard-wired to the mentioned VME IRQ's.
* (or'ed).
*/
#define SCU_IRQ7 0x80
#define SCU_IQ6_MFP 0x40 /* Also MFP interrupt */
#define SCU_IRQ5_SCC 0x20 /* Also SCC interrupt */
#define SCU_IRQ4 0x10
#define SCU_IRQ3_SOFT 0x08 /* Also VME Software interrupt */
#define SCU_IRQ2 0x04
#define SCU_IRQ1 0x02
/* 0x00 Not Used */
/*
* Generate/remove Software system interrupt.
* Note: Will not be cleared automatically!!
*/
#define SET_SOFT_INT (SCU->sys_int = 1)
#define CLR_SOFT_INT (SCU->sys_int = 0)
/*
* Generate/remove Software VME interrupt.
* Note: Will not be cleared automatically!!
*/
#define SET_VME_INT (SCU->vme_int = 1)
#define CLR_VME_INT (SCU->vme_int = 0)
#endif /* _MACHINE_SCU_H */
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