/*******************************************************************
* Commodore-Amiga, Inc.
* cia.h -- definitions for the registers and bits in the Complex Interface
* Adapter (CIA) chip
*
* $Header: cia.h,v 27.1 85/06/24 14:42:45 neil Exp $
*
* $Locker:  $
*
********************************************************************/

#ifndef HARDWARE_CIA_H
#define HARDWARE_CIA_H

/*
 * ciaa is on an ODD address (e.g. the low byte) -- $bfe001
 * ciab is on an EVEN address (e.g. the high byte) -- $bfd000
 *
 * do this to get the definitions:
 *    extern struct CIA ciaa, ciab;
 */


struct CIA {
    UBYTE   ciapra;
    UBYTE   pad0[0xff];
    UBYTE   ciaprb;
    UBYTE   pad1[0xff];
    UBYTE   ciaddra;
    UBYTE   pad2[0xff];
    UBYTE   ciaddrb;
    UBYTE   pad3[0xff];
    UBYTE   ciatalo;
    UBYTE   pad4[0xff];
    UBYTE   ciatahi;
    UBYTE   pad5[0xff];
    UBYTE   ciatblo;
    UBYTE   pad6[0xff];
    UBYTE   ciatbhi;
    UBYTE   pad7[0xff];
    UBYTE   ciatodlow;
    UBYTE   pad8[0xff];
    UBYTE   ciatodmid;
    UBYTE   pad9[0xff];
    UBYTE   ciatodhi;
    UBYTE   pad10[0xff];
    UBYTE   unusedreg;
    UBYTE   pad11[0xff];
    UBYTE   ciasdr;
    UBYTE   pad12[0xff];
    UBYTE   ciaicr;
    UBYTE   pad13[0xff];
    UBYTE   ciacra;
    UBYTE   pad14[0xff];
    UBYTE   ciacrb;
};


/* interrupt control register bit numbers */
#define CIAICRB_TA      0
#define CIAICRB_TB      1
#define CIAICRB_ALRM    2
#define CIAICRB_SP      3
#define CIAICRB_FLG     4
#define CIAICRB_IR      7
#define CIAICRB_SETCLR  7

/* control register A bit numbers */
#define CIACRAB_START   0
#define CIACRAB_PBON    1
#define CIACRAB_OUTMODE 2
#define CIACRAB_RUNMODE 3
#define CIACRAB_LOAD    4
#define CIACRAB_INMODE  5
#define CIACRAB_SPMODE  6
#define CIACRAB_TODIN   7

/* control register B bit numbers */
#define CIACRBB_START   0
#define CIACRBB_PBON    1
#define CIACRBB_OUTMODE 2
#define CIACRBB_RUNMODE 3
#define CIACRBB_LOAD    4
#define CIACRBB_INMODE0 5
#define CIACRBB_INMODE1 6
#define CIACRBB_ALARM   7
 
/* interrupt control register masks */
#define CIAICRF_TA      (1<<CIAICRB_TA)
#define CIAICRF_TB      (1<<CIAICRB_TB)
#define CIAICRF_ALRM    (1<<CIAICRB_ALRM)
#define CIAICRF_SP      (1<<CIAICRB_SP)
#define CIAICRF_FLG     (1<<CIAICRB_FLG)
#define CIAICRF_IR      (1<<CIAICRB_IR)
#define CIAICRF_SETCLR  (1<<CIAICRB_SETCLR)

/* control register A register masks */
#define CIACRAF_START   (1<<CIACRAB_START)
#define CIACRAF_PBON    (1<<CIACRAB_PBON)
#define CIACRAF_OUTMODE (1<<CIACRAB_OUTMODE)
#define CIACRAF_RUNMODE (1<<CIACRAB_RUNMODE)
#define CIACRAF_LOAD    (1<<CIACRAB_LOAD)
#define CIACRAF_INMODE  (1<<CIACRAB_INMODE)
#define CIACRAF_SPMODE  (1<<CIACRAB_SPMODE)
#define CIACRAF_TODIN   (1<<CIACRAB_TODIN)
 
/* control register B register masks */
#define CIACRBF_START   (1<<CIACRBB_START)
#define CIACRBF_PBON    (1<<CIACRBB_PBON)
#define CIACRBF_OUTMODE (1<<CIACRBB_OUTMODE)
#define CIACRBF_RUNMODE (1<<CIACRBB_RUNMODE)
#define CIACRBF_LOAD    (1<<CIACRBB_LOAD)
#define CIACRBF_INMODE0 (1<<CIACRBB_INMODE0)
#define CIACRBF_INMODE1 (1<<CIACRBB_INMODE1)
#define CIACRBF_ALARM   (1<<CIACRBB_ALARM)

/* control register B INMODE masks */
#define CIACRBF_IN_PHI2 0
#define CIACRBF_IN_CNT  (CIACRBF_INMODE0)
#define CIACRBF_IN_TA   (CIACRBF_INMODE1)
#define CIACRBF_IN_CNT_TA  (CIACRBF_INMODE0|CIACRBF_INMODE1)

/*
 * Port definitions -- what each bit in a cia peripheral register is tied to
 */

/* ciaa port A (0xbfe001) */
#define CIAB_GAMEPORT1  (7)   /* gameport 1, pin 6 (fire button*) */
#define CIAB_GAMEPORT0  (6)   /* gameport 0, pin 6 (fire button*) */
#define CIAB_DSKRDY     (5)   /* disk ready* */
#define CIAB_DSKTRACK0  (4)   /* disk on track 00* */
#define CIAB_DSKPROT    (3)   /* disk write protect* */
#define CIAB_DSKCHANGE  (2)   /* disk change* */
#define CIAB_LED        (1)   /* led light control (0==>bright) */
#define CIAB_OVERLAY    (0)   /* memory overlay bit */

/* ciaa port B (0xbfe101) -- parallel port */

/* ciab port A (0xbfd000) -- serial and printer control */
#define CIAB_COMDTR     (7)   /* serial Data Terminal Ready* */
#define CIAB_COMRTS     (6)   /* serial Request to Send* */
#define CIAB_COMCD      (5)   /* serial Carrier Detect* */
#define CIAB_COMCTS     (4)   /* serial Clear to Send* */
#define CIAB_COMDSR     (3)   /* serial Data Set Ready* */
#define CIAB_PRTRSEL    (2)   /* printer SELECT */
#define CIAB_PRTRPOUT   (1)   /* printer paper out */
#define CIAB_PRTRBUSY   (0)   /* printer busy */

/* ciab port B (0xbfd100) -- disk control */
#define CIAB_DSKMOTOR   (7)   /* disk motorr* */
#define CIAB_DSKSEL3    (6)   /* disk select unit 3* */
#define CIAB_DSKSEL2    (5)   /* disk select unit 2* */
#define CIAB_DSKSEL1    (4)   /* disk select unit 1* */
#define CIAB_DSKSEL0    (3)   /* disk select unit 0* */
#define CIAB_DSKSIDE    (2)   /* disk side select* */
#define CIAB_DSKDIREC   (1)   /* disk direction of seek* */
#define CIAB_DSKSTEP    (0)   /* disk step heads* */

/* ciaa port A (0xbfe001) */
#define CIAF_GAMEPORT1  (1<<7)
#define CIAF_GAMEPORT0  (1<<6)
#define CIAF_DSKRDY     (1<<5)
#define CIAF_DSKTRACK0  (1<<4)
#define CIAF_DSKPROT    (1<<3)
#define CIAF_DSKCHANGE  (1<<2)
#define CIAF_LED        (1<<1)
#define CIAF_OVERLAY    (1<<0)

/* ciaa port B (0xbfe101) -- parallel port */

/* ciab port A (0xbfd000) -- serial and printer control */
#define CIAF_COMDTR     (1<<7)
#define CIAF_COMRTS     (1<<6)
#define CIAF_COMCD      (1<<5)
#define CIAF_COMCTS     (1<<4)
#define CIAF_COMDSR     (1<<3)
#define CIAF_PRTRSEL    (1<<2)
#define CIAF_PRTRPOUT   (1<<1)
#define CIAF_PRTRBUSY   (1<<0)

/* ciab port B (0xbfd100) -- disk control */
#define CIAF_DSKMOTOR   (1<<7)
#define CIAF_DSKSEL3    (1<<6)
#define CIAF_DSKSEL2    (1<<5)
#define CIAF_DSKSEL1    (1<<4)
#define CIAF_DSKSEL0    (1<<3)
#define CIAF_DSKSIDE    (1<<2)
#define CIAF_DSKDIREC   (1<<1)
#define CIAF_DSKSTEP    (1<<0)

#endif !HARDWARE_CIA_H