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