1 /* $NetBSD: clock.c,v 1.12 2014/04/19 06:04:58 tsutsui 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 <hp300/dev/frodoreg.h> /* for APCI offsets */ 50 #include <hp300/dev/intioreg.h> /* for frodo offsets */ 51 #include <dev/ic/mc146818reg.h> 52 53 #include <lib/libsa/stand.h> 54 #include <lib/libsa/net.h> 55 #include <hp300/stand/common/samachdep.h> 56 57 #define FEBRUARY 2 58 #define STARTOFTIME 1970 59 #define SECDAY (60L * 60L * 24L) 60 #define SECYR (SECDAY * 365) 61 62 #define BBC_SET_REG 0xe0 63 #define BBC_WRITE_REG 0xc2 64 #define BBC_READ_REG 0xc3 65 #define NUM_BBC_REGS 12 66 67 #define leapyear(year) ((year) % 4 == 0) 68 #define range_test(n, l, h) if ((n) < (l) || (n) > (h)) return false 69 #define days_in_year(a) (leapyear(a) ? 366 : 365) 70 #define days_in_month(a) (month_days[(a) - 1]) 71 #define bbc_to_decimal(a,b) (bbc_registers[a] * 10 + bbc_registers[b]) 72 73 static const int month_days[12] = { 74 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 75 }; 76 77 static uint8_t bbc_registers[13]; 78 static struct hil_dev *bbcaddr = BBCADDR; 79 80 static volatile uint8_t *mcclock = 81 (volatile uint8_t *)(INTIOBASE + FRODO_BASE + FRODO_CALENDAR); 82 83 static bool clock_to_gmt(satime_t *); 84 85 static void read_bbc(void); 86 static uint8_t read_bbc_reg(int); 87 static uint8_t mc_read(u_int); 88 89 satime_t 90 getsecs(void) 91 { 92 static bool clockinited = false; 93 satime_t timbuf = 0; 94 95 if (!clock_to_gmt(&timbuf) && !clockinited) 96 printf("WARNING: bad date in battery clock\n"); 97 clockinited = true; 98 99 /* Battery clock does not store usec's, so forget about it. */ 100 return timbuf; 101 } 102 103 static bool 104 clock_to_gmt(satime_t *timbuf) 105 { 106 int i; 107 satime_t tmp; 108 int year, month, day, hour, min, sec; 109 110 if (machineid == HP_425 && mmuid == MMUID_425_E) { 111 /* 425e uses mcclock on the frodo utility chip */ 112 while ((mc_read(MC_REGA) & MC_REGA_UIP) != 0) 113 continue; 114 sec = mc_read(MC_SEC); 115 min = mc_read(MC_MIN); 116 hour = mc_read(MC_HOUR); 117 day = mc_read(MC_DOM); 118 month = mc_read(MC_MONTH); 119 year = mc_read(MC_YEAR) + 1900; 120 } else { 121 /* Use the traditional HIL bbc for all other models */ 122 read_bbc(); 123 124 sec = bbc_to_decimal(1, 0); 125 min = bbc_to_decimal(3, 2); 126 127 /* 128 * Hours are different for some reason. Makes no sense really. 129 */ 130 hour = ((bbc_registers[5] & 0x03) * 10) + bbc_registers[4]; 131 day = bbc_to_decimal(8, 7); 132 month = bbc_to_decimal(10, 9); 133 year = bbc_to_decimal(12, 11) + 1900; 134 } 135 136 if (year < STARTOFTIME) 137 year += 100; 138 139 #ifdef CLOCK_DEBUG 140 printf("clock todr: %u/%u/%u %u:%u:%u\n", 141 year, month, day, hour, min, sec); 142 #endif 143 144 range_test(hour, 0, 23); 145 range_test(day, 1, 31); 146 range_test(month, 1, 12); 147 148 tmp = 0; 149 150 for (i = STARTOFTIME; i < year; i++) 151 tmp += days_in_year(i); 152 if (leapyear(year) && month > FEBRUARY) 153 tmp++; 154 155 for (i = 1; i < month; i++) 156 tmp += days_in_month(i); 157 158 tmp += (day - 1); 159 tmp = ((tmp * 24 + hour) * 60 + min) * 60 + sec; 160 161 *timbuf = tmp; 162 return true; 163 } 164 165 static void 166 read_bbc(void) 167 { 168 int i; 169 bool read_okay; 170 171 read_okay = false; 172 while (!read_okay) { 173 read_okay = true; 174 for (i = 0; i <= NUM_BBC_REGS; i++) 175 bbc_registers[i] = read_bbc_reg(i); 176 for (i = 0; i <= NUM_BBC_REGS; i++) 177 if (bbc_registers[i] != read_bbc_reg(i)) 178 read_okay = false; 179 } 180 } 181 182 static uint8_t 183 read_bbc_reg(int reg) 184 { 185 uint8_t data = reg; 186 187 if (bbcaddr != NULL) { 188 #if 0 189 send_hil_cmd(bbcaddr, BBC_SET_REG, &data, 1, NULL); 190 send_hil_cmd(bbcaddr, BBC_READ_REG, NULL, 0, &data); 191 #else 192 HILWAIT(bbcaddr); 193 bbcaddr->hil_cmd = BBC_SET_REG; 194 HILWAIT(bbcaddr); 195 bbcaddr->hil_data = data; 196 HILWAIT(bbcaddr); 197 bbcaddr->hil_cmd = BBC_READ_REG; 198 HILDATAWAIT(bbcaddr); 199 data = bbcaddr->hil_data; 200 #endif 201 } 202 return data; 203 } 204 205 uint8_t 206 mc_read(u_int reg) 207 { 208 uint8_t datum; 209 210 mcclock[0] = (uint8_t)reg; 211 datum = mcclock[1 << 2]; /* frodo chip has 4 byte stride */ 212 213 return datum; 214 } 215