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