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clock.c revision 1.2 
      1 /*	$NetBSD: clock.c,v 1.2 2001/11/08 07:01:33 gmcgarry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  * from: Utah $Hdr: clock.c 1.18 91/01/21$
     41  *
     42  *	@(#)clock.c	8.2 (Berkeley) 1/12/94
     43  */
     44 
     45 #include <sys/param.h>
     46 
     47 #include <hp300/dev/hilreg.h>
     48 
     49 #define FEBRUARY        2
     50 #define STARTOFTIME     1970
     51 #define SECDAY          86400L
     52 #define SECYR           (SECDAY * 365)
     53 
     54 #define BBC_SET_REG     0xe0
     55 #define BBC_WRITE_REG   0xc2
     56 #define BBC_READ_REG    0xc3
     57 #define NUM_BBC_REGS    12
     58 
     59 #define leapyear(year)		((year) % 4 == 0)
     60 #define range_test(n, l, h)	if ((n) < (l) || (n) > (h)) return(0)
     61 #define days_in_year(a)		(leapyear(a) ? 366 : 365)
     62 #define days_in_month(a)	(month_days[(a) - 1])
     63 #define bbc_to_decimal(a,b)	(bbc_registers[a] * 10 + bbc_registers[b])
     64 
     65 #include <hp300/stand/common/samachdep.h>
     66 
     67 static int month_days[12] = {
     68 	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
     69 };
     70 
     71 u_char bbc_registers[13];
     72 u_char read_bbc_reg();
     73 struct hil_dev *bbcaddr = BBCADDR;
     74 
     75 getsecs()
     76 {
     77 	static int bbcinited = 0;
     78 	u_long timbuf = 0;
     79 
     80 	if (!bbc_to_gmt(&timbuf) && !bbcinited)
     81 		printf("WARNING: bad date in battery clock\n");
     82 	bbcinited = 1;
     83 
     84 	/* Battery clock does not store usec's, so forget about it. */
     85 	return(timbuf);
     86 }
     87 
     88 
     89 bbc_to_gmt(timbuf)
     90 	u_long *timbuf;
     91 {
     92 	register int i;
     93 	register u_long tmp;
     94 	int year, month, day, hour, min, sec;
     95 
     96 	read_bbc();
     97 
     98 	sec = bbc_to_decimal(1, 0);
     99 	min = bbc_to_decimal(3, 2);
    100 
    101 	/*
    102 	 * Hours are different for some reason. Makes no sense really.
    103 	 */
    104 	hour  = ((bbc_registers[5] & 0x03) * 10) + bbc_registers[4];
    105 	day   = bbc_to_decimal(8, 7);
    106 	month = bbc_to_decimal(10, 9);
    107 	year  = bbc_to_decimal(12, 11) + 1900;
    108 
    109 	range_test(hour, 0, 23);
    110 	range_test(day, 1, 31);
    111 	range_test(month, 1, 12);
    112 	range_test(year, STARTOFTIME, 2000);
    113 
    114 	tmp = 0;
    115 
    116 	for (i = STARTOFTIME; i < year; i++)
    117 		tmp += days_in_year(i);
    118 	if (leapyear(year) && month > FEBRUARY)
    119 		tmp++;
    120 
    121 	for (i = 1; i < month; i++)
    122 	  	tmp += days_in_month(i);
    123 
    124 	tmp += (day - 1);
    125 	tmp = ((tmp * 24 + hour) * 60 + min) * 60 + sec;
    126 
    127 	*timbuf = tmp;
    128 	return(1);
    129 }
    130 
    131 read_bbc()
    132 {
    133   	register int i, read_okay;
    134 
    135 	read_okay = 0;
    136 	while (!read_okay) {
    137 		read_okay = 1;
    138 		for (i = 0; i <= NUM_BBC_REGS; i++)
    139 			bbc_registers[i] = read_bbc_reg(i);
    140 		for (i = 0; i <= NUM_BBC_REGS; i++)
    141 			if (bbc_registers[i] != read_bbc_reg(i))
    142 				read_okay = 0;
    143 	}
    144 }
    145 
    146 u_char
    147 read_bbc_reg(reg)
    148 	int reg;
    149 {
    150 	u_char data = reg;
    151 
    152 	if (bbcaddr) {
    153 #if 0
    154 		send_hil_cmd(bbcaddr, BBC_SET_REG, &data, 1, NULL);
    155 		send_hil_cmd(bbcaddr, BBC_READ_REG, NULL, 0, &data);
    156 #else
    157 		HILWAIT(bbcaddr);
    158 		bbcaddr->hil_cmd = BBC_SET_REG;
    159 		HILWAIT(bbcaddr);
    160 		bbcaddr->hil_data = data;
    161 		HILWAIT(bbcaddr);
    162 		bbcaddr->hil_cmd = BBC_READ_REG;
    163 		HILDATAWAIT(bbcaddr);
    164 		data = bbcaddr->hil_data;
    165 #endif
    166 	}
    167 	return(data);
    168 }
    169