1 /* 2 * (C) Copyright 2001 3 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /* 25 * Date & Time support for the MC146818 (PIXX4) RTC 26 */ 27 28 /*#define DEBUG*/ 29 30 #include <common.h> 31 #include <command.h> 32 #include <rtc.h> 33 34 #if defined(CONFIG_CMD_DATE) 35 36 static uchar rtc_read (uchar reg); 37 static void rtc_write (uchar reg, uchar val); 38 static uchar bin2bcd (unsigned int n); 39 static unsigned bcd2bin(uchar c); 40 41 #define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70 42 #define RTC_SECONDS 0x00 43 #define RTC_SECONDS_ALARM 0x01 44 #define RTC_MINUTES 0x02 45 #define RTC_MINUTES_ALARM 0x03 46 #define RTC_HOURS 0x04 47 #define RTC_HOURS_ALARM 0x05 48 #define RTC_DAY_OF_WEEK 0x06 49 #define RTC_DATE_OF_MONTH 0x07 50 #define RTC_MONTH 0x08 51 #define RTC_YEAR 0x09 52 #define RTC_CONFIG_A 0x0A 53 #define RTC_CONFIG_B 0x0B 54 #define RTC_CONFIG_C 0x0C 55 #define RTC_CONFIG_D 0x0D 56 57 58 /* ------------------------------------------------------------------------- */ 59 60 int rtc_get (struct rtc_time *tmp) 61 { 62 uchar sec, min, hour, mday, wday, mon, year; 63 /* here check if rtc can be accessed */ 64 while((rtc_read(RTC_CONFIG_A)&0x80)==0x80); 65 sec = rtc_read (RTC_SECONDS); 66 min = rtc_read (RTC_MINUTES); 67 hour = rtc_read (RTC_HOURS); 68 mday = rtc_read (RTC_DATE_OF_MONTH); 69 wday = rtc_read (RTC_DAY_OF_WEEK); 70 mon = rtc_read (RTC_MONTH); 71 year = rtc_read (RTC_YEAR); 72 #ifdef CONFIG_AMIGAONEG3SE 73 wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */ 74 #endif 75 #ifdef RTC_DEBUG 76 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 77 "hr: %02x min: %02x sec: %02x\n", 78 year, mon, mday, wday, 79 hour, min, sec ); 80 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", 81 rtc_read (RTC_CONFIG_D) & 0x3F, 82 rtc_read (RTC_HOURS_ALARM), 83 rtc_read (RTC_MINUTES_ALARM), 84 rtc_read (RTC_SECONDS_ALARM) ); 85 #endif 86 tmp->tm_sec = bcd2bin (sec & 0x7F); 87 tmp->tm_min = bcd2bin (min & 0x7F); 88 tmp->tm_hour = bcd2bin (hour & 0x3F); 89 tmp->tm_mday = bcd2bin (mday & 0x3F); 90 tmp->tm_mon = bcd2bin (mon & 0x1F); 91 tmp->tm_year = bcd2bin (year); 92 tmp->tm_wday = bcd2bin (wday & 0x07); 93 if(tmp->tm_year<70) 94 tmp->tm_year+=2000; 95 else 96 tmp->tm_year+=1900; 97 tmp->tm_yday = 0; 98 tmp->tm_isdst= 0; 99 #ifdef RTC_DEBUG 100 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 101 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 102 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 103 #endif 104 105 return 0; 106 } 107 108 int rtc_set (struct rtc_time *tmp) 109 { 110 #ifdef RTC_DEBUG 111 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 112 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 113 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 114 #endif 115 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 116 117 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 118 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 119 #ifdef CONFIG_AMIGAONEG3SE 120 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1); 121 #else 122 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 123 #endif 124 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); 125 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 126 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 127 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 128 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 129 130 return 0; 131 } 132 133 void rtc_reset (void) 134 { 135 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 136 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ 137 rtc_write(RTC_CONFIG_B,0x00); 138 rtc_write(RTC_CONFIG_B,0x00); 139 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 140 } 141 142 /* ------------------------------------------------------------------------- */ 143 144 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR 145 /* 146 * use direct memory access 147 */ 148 static uchar rtc_read (uchar reg) 149 { 150 return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); 151 } 152 153 static void rtc_write (uchar reg, uchar val) 154 { 155 out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); 156 } 157 #else 158 static uchar rtc_read (uchar reg) 159 { 160 out8(RTC_PORT_MC146818,reg); 161 return(in8(RTC_PORT_MC146818+1)); 162 } 163 164 static void rtc_write (uchar reg, uchar val) 165 { 166 out8(RTC_PORT_MC146818,reg); 167 out8(RTC_PORT_MC146818+1,val); 168 } 169 #endif 170 171 static unsigned bcd2bin (uchar n) 172 { 173 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); 174 } 175 176 static unsigned char bin2bcd (unsigned int n) 177 { 178 return (((n / 10) << 4) | (n % 10)); 179 } 180 181 #endif 182