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clock.c revision 1.11 
      1 /*	$NetBSD: clock.c,v 1.11 2011/02/08 20:20:14 rmind 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. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: clock.c 1.18 91/01/21$
     37  *
     38  *	@(#)clock.c	8.2 (Berkeley) 1/12/94
     39  */
     40 
     41 #include <sys/param.h>
     42 
     43 #include <net/if_ether.h>
     44 #include <netinet/in.h>
     45 #include <netinet/in_systm.h>
     46 
     47 #include <hp300/stand/common/hilreg.h>
     48 
     49 #include <lib/libsa/stand.h>
     50 #include <lib/libsa/net.h>
     51 #include <hp300/stand/common/samachdep.h>
     52 
     53 #define FEBRUARY        2
     54 #define STARTOFTIME     1970
     55 #define SECDAY          (60L * 60L * 24L)
     56 #define SECYR           (SECDAY * 365)
     57 
     58 #define BBC_SET_REG     0xe0
     59 #define BBC_WRITE_REG   0xc2
     60 #define BBC_READ_REG    0xc3
     61 #define NUM_BBC_REGS    12
     62 
     63 #define leapyear(year)		((year) % 4 == 0)
     64 #define range_test(n, l, h)	if ((n) < (l) || (n) > (h)) return 0
     65 #define days_in_year(a)		(leapyear(a) ? 366 : 365)
     66 #define days_in_month(a)	(month_days[(a) - 1])
     67 #define bbc_to_decimal(a,b)	(bbc_registers[a] * 10 + bbc_registers[b])
     68 
     69 static const int month_days[12] = {
     70 	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
     71 };
     72 
     73 u_char bbc_registers[13];
     74 struct hil_dev *bbcaddr = BBCADDR;
     75 
     76 static int bbc_to_gmt(satime_t *);
     77 
     78 satime_t
     79 getsecs(void)
     80 {
     81 	static int bbcinited = 0;
     82 	satime_t timbuf = 0;
     83 
     84 	if (!bbc_to_gmt(&timbuf) && !bbcinited)
     85 		printf("WARNING: bad date in battery clock\n");
     86 	bbcinited = 1;
     87 
     88 	/* Battery clock does not store usec's, so forget about it. */
     89 	return timbuf;
     90 }
     91 
     92 
     93 static int
     94 bbc_to_gmt(satime_t *timbuf)
     95 {
     96 	int i;
     97 	u_long tmp;
     98 	int year, month, day, hour, min, sec;
     99 
    100 	read_bbc();
    101 
    102 	sec = bbc_to_decimal(1, 0);
    103 	min = bbc_to_decimal(3, 2);
    104 
    105 	/*
    106 	 * Hours are different for some reason. Makes no sense really.
    107 	 */
    108 	hour  = ((bbc_registers[5] & 0x03) * 10) + bbc_registers[4];
    109 	day   = bbc_to_decimal(8, 7);
    110 	month = bbc_to_decimal(10, 9);
    111 	year  = bbc_to_decimal(12, 11) + 1900;
    112 	if (year < STARTOFTIME)
    113 		year += 100;
    114 
    115 	range_test(hour, 0, 23);
    116 	range_test(day, 1, 31);
    117 	range_test(month, 1, 12);
    118 
    119 	tmp = 0;
    120 
    121 	for (i = STARTOFTIME; i < year; i++)
    122 		tmp += days_in_year(i);
    123 	if (leapyear(year) && month > FEBRUARY)
    124 		tmp++;
    125 
    126 	for (i = 1; i < month; i++)
    127 	  	tmp += days_in_month(i);
    128 
    129 	tmp += (day - 1);
    130 	tmp = ((tmp * 24 + hour) * 60 + min) * 60 + sec;
    131 
    132 	*timbuf = tmp;
    133 	return 1;
    134 }
    135 
    136 void
    137 read_bbc(void)
    138 {
    139   	int i, read_okay;
    140 
    141 	read_okay = 0;
    142 	while (!read_okay) {
    143 		read_okay = 1;
    144 		for (i = 0; i <= NUM_BBC_REGS; i++)
    145 			bbc_registers[i] = read_bbc_reg(i);
    146 		for (i = 0; i <= NUM_BBC_REGS; i++)
    147 			if (bbc_registers[i] != read_bbc_reg(i))
    148 				read_okay = 0;
    149 	}
    150 }
    151 
    152 u_char
    153 read_bbc_reg(int reg)
    154 {
    155 	u_char data = reg;
    156 
    157 	if (bbcaddr) {
    158 #if 0
    159 		send_hil_cmd(bbcaddr, BBC_SET_REG, &data, 1, NULL);
    160 		send_hil_cmd(bbcaddr, BBC_READ_REG, NULL, 0, &data);
    161 #else
    162 		HILWAIT(bbcaddr);
    163 		bbcaddr->hil_cmd = BBC_SET_REG;
    164 		HILWAIT(bbcaddr);
    165 		bbcaddr->hil_data = data;
    166 		HILWAIT(bbcaddr);
    167 		bbcaddr->hil_cmd = BBC_READ_REG;
    168 		HILDATAWAIT(bbcaddr);
    169 		data = bbcaddr->hil_data;
    170 #endif
    171 	}
    172 	return data;
    173 }
    174