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 39 #define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70 40 #define RTC_SECONDS 0x00 41 #define RTC_SECONDS_ALARM 0x01 42 #define RTC_MINUTES 0x02 43 #define RTC_MINUTES_ALARM 0x03 44 #define RTC_HOURS 0x04 45 #define RTC_HOURS_ALARM 0x05 46 #define RTC_DAY_OF_WEEK 0x06 47 #define RTC_DATE_OF_MONTH 0x07 48 #define RTC_MONTH 0x08 49 #define RTC_YEAR 0x09 50 #define RTC_CONFIG_A 0x0A 51 #define RTC_CONFIG_B 0x0B 52 #define RTC_CONFIG_C 0x0C 53 #define RTC_CONFIG_D 0x0D 54 55 56 /* ------------------------------------------------------------------------- */ 57 58 int rtc_get (struct rtc_time *tmp) 59 { 60 uchar sec, min, hour, mday, wday, mon, year; 61 /* here check if rtc can be accessed */ 62 while((rtc_read(RTC_CONFIG_A)&0x80)==0x80); 63 sec = rtc_read (RTC_SECONDS); 64 min = rtc_read (RTC_MINUTES); 65 hour = rtc_read (RTC_HOURS); 66 mday = rtc_read (RTC_DATE_OF_MONTH); 67 wday = rtc_read (RTC_DAY_OF_WEEK); 68 mon = rtc_read (RTC_MONTH); 69 year = rtc_read (RTC_YEAR); 70 #ifdef CONFIG_AMIGAONEG3SE 71 wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */ 72 #endif 73 #ifdef RTC_DEBUG 74 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 75 "hr: %02x min: %02x sec: %02x\n", 76 year, mon, mday, wday, 77 hour, min, sec ); 78 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", 79 rtc_read (RTC_CONFIG_D) & 0x3F, 80 rtc_read (RTC_HOURS_ALARM), 81 rtc_read (RTC_MINUTES_ALARM), 82 rtc_read (RTC_SECONDS_ALARM) ); 83 #endif 84 tmp->tm_sec = bcd2bin (sec & 0x7F); 85 tmp->tm_min = bcd2bin (min & 0x7F); 86 tmp->tm_hour = bcd2bin (hour & 0x3F); 87 tmp->tm_mday = bcd2bin (mday & 0x3F); 88 tmp->tm_mon = bcd2bin (mon & 0x1F); 89 tmp->tm_year = bcd2bin (year); 90 tmp->tm_wday = bcd2bin (wday & 0x07); 91 if(tmp->tm_year<70) 92 tmp->tm_year+=2000; 93 else 94 tmp->tm_year+=1900; 95 tmp->tm_yday = 0; 96 tmp->tm_isdst= 0; 97 #ifdef RTC_DEBUG 98 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 99 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 100 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 101 #endif 102 103 return 0; 104 } 105 106 int rtc_set (struct rtc_time *tmp) 107 { 108 #ifdef RTC_DEBUG 109 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 110 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 111 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 112 #endif 113 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 114 115 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 116 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 117 #ifdef CONFIG_AMIGAONEG3SE 118 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1); 119 #else 120 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 121 #endif 122 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); 123 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 124 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 125 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 126 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 127 128 return 0; 129 } 130 131 void rtc_reset (void) 132 { 133 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 134 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ 135 rtc_write(RTC_CONFIG_B,0x00); 136 rtc_write(RTC_CONFIG_B,0x00); 137 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 138 } 139 140 /* ------------------------------------------------------------------------- */ 141 142 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR 143 /* 144 * use direct memory access 145 */ 146 static uchar rtc_read (uchar reg) 147 { 148 return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); 149 } 150 151 static void rtc_write (uchar reg, uchar val) 152 { 153 out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); 154 } 155 #else 156 static uchar rtc_read (uchar reg) 157 { 158 out8(RTC_PORT_MC146818,reg); 159 return(in8(RTC_PORT_MC146818+1)); 160 } 161 162 static void rtc_write (uchar reg, uchar val) 163 { 164 out8(RTC_PORT_MC146818,reg); 165 out8(RTC_PORT_MC146818+1,val); 166 } 167 #endif 168 169 #endif 170