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clockreg.h revision 1.1 
      1 /*	$NetBSD: clockreg.h,v 1.1 1995/03/26 07:12:15 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 _CLOCKREG_H
     34 #define _CLOCKREG_H
     35 /*
     36  * Atari TT hardware:
     37  * Motorola MC146818A RealTimeClock
     38  */
     39 
     40 #define	RTC	((struct rtc *)AD_RTC)
     41 
     42 struct rtc {
     43 	volatile u_char	rtc_dat[4];
     44 };
     45 
     46 #define rtc_regno	rtc_dat[1]	/* register nr. select		*/
     47 #define rtc_data	rtc_dat[3]	/* data register		*/
     48 
     49 /*
     50  * Register number definitions
     51  */
     52 #define	RTC_SEC		0
     53 #define	RTC_ASEC	1
     54 #define	RTC_MIN		2
     55 #define	RTC_A_MIN	3
     56 #define	RTC_HOUR	4
     57 #define	RTC_A_HOUR	5
     58 #define	RTC_WDAY	6
     59 #define	RTC_DAY		7
     60 #define	RTC_MONTH	8
     61 #define	RTC_YEAR	9
     62 #define	RTC_REGA	10
     63 #define	RTC_REGB	11
     64 #define	RTC_REGC	12
     65 #define	RTC_REGD	13
     66 #define	RTC_RAMBOT	14	/* Reg. offset of nv-RAM		*/
     67 #define	RTC_RAMSIZ	50	/* #bytes of nv-RAM available		*/
     68 
     69 /*
     70  * Define fields for register A
     71  */
     72 #define	RTC_A_UIP	0x80	/* Update In Progress			*/
     73 #define	RTC_A_DV2	0x40	/* Divider select			*/
     74 #define	RTC_A_DV1	0x20	/* Divider select			*/
     75 #define	RTC_A_DV0	0x10	/* Divider select			*/
     76 #define	RTC_A_RS3	0x08	/* Rate Select				*/
     77 #define	RTC_A_RS2	0x04	/* Rate Select				*/
     78 #define	RTC_A_RS1	0x02	/* Rate Select				*/
     79 #define	RTC_A_RS0	0x01	/* Rate Select				*/
     80 
     81 /*
     82  * Define fields for register B
     83  */
     84 #define	RTC_B_SET	0x80	/* SET date/time				*/
     85 #define	RTC_B_PIE	0x40	/* Periodic Int. Enable			*/
     86 #define	RTC_B_AIE	0x20	/* Alarm Int. Enable			*/
     87 #define	RTC_B_UIE	0x10	/* Update Ended Int. Enable		*/
     88 #define	RTC_B_SQWE	0x08	/* Square Wave Output Enable		*/
     89 #define	RTC_B_DM	0x04	/* Binary Data mode			*/
     90 #define	RTC_B_24_12	0x02	/* 24 Hour mode				*/
     91 #define	RTC_B_DSE	0x01	/* DST Enable				*/
     92 
     93 /*
     94  * Define fields for register C
     95  */
     96 #define	RTC_C_IRQF	0x80	/* IRQ flag				*/
     97 #define	RTC_C_PF	0x40	/* Periodic Int. flag			*/
     98 #define	RTC_C_AF	0x20	/* Alarm Int. flag			*/
     99 #define	RTC_C_UF	0x10	/* Update Ended Int. flag		*/
    100 
    101 /*
    102  * Define fields for register D
    103  */
    104 #define	RTC_D_VRT	0x80	/* Valid Ram and Time			*/
    105 
    106 /*
    107  * Some useful constants/macros
    108  */
    109 #define	is_leap(x)		(!(x % 4) && ((x % 100) || !(x % 1000)))
    110 #define	range_test(n, l, h)	((n) < (l) || (n) > (h))
    111 #define	SECS_DAY		86400L
    112 #define	SECS_HOUR		3600L
    113 #define	STARTOFTIME		1970
    114 #endif /* _CLOCKREG_H */
    115