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 RTC_DEBUG 71 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 72 "hr: %02x min: %02x sec: %02x\n", 73 year, mon, mday, wday, 74 hour, min, sec ); 75 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", 76 rtc_read (RTC_CONFIG_D) & 0x3F, 77 rtc_read (RTC_HOURS_ALARM), 78 rtc_read (RTC_MINUTES_ALARM), 79 rtc_read (RTC_SECONDS_ALARM) ); 80 #endif 81 tmp->tm_sec = bcd2bin (sec & 0x7F); 82 tmp->tm_min = bcd2bin (min & 0x7F); 83 tmp->tm_hour = bcd2bin (hour & 0x3F); 84 tmp->tm_mday = bcd2bin (mday & 0x3F); 85 tmp->tm_mon = bcd2bin (mon & 0x1F); 86 tmp->tm_year = bcd2bin (year); 87 tmp->tm_wday = bcd2bin (wday & 0x07); 88 if(tmp->tm_year<70) 89 tmp->tm_year+=2000; 90 else 91 tmp->tm_year+=1900; 92 tmp->tm_yday = 0; 93 tmp->tm_isdst= 0; 94 #ifdef RTC_DEBUG 95 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 96 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 97 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 98 #endif 99 100 return 0; 101 } 102 103 int rtc_set (struct rtc_time *tmp) 104 { 105 #ifdef RTC_DEBUG 106 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 107 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 108 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 109 #endif 110 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 111 112 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 113 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 114 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 115 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); 116 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 117 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 118 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 119 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 120 121 return 0; 122 } 123 124 void rtc_reset (void) 125 { 126 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 127 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ 128 rtc_write(RTC_CONFIG_B,0x00); 129 rtc_write(RTC_CONFIG_B,0x00); 130 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 131 } 132 133 /* ------------------------------------------------------------------------- */ 134 135 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR 136 /* 137 * use direct memory access 138 */ 139 static uchar rtc_read (uchar reg) 140 { 141 return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); 142 } 143 144 static void rtc_write (uchar reg, uchar val) 145 { 146 out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); 147 } 148 #else 149 static uchar rtc_read (uchar reg) 150 { 151 out8(RTC_PORT_MC146818,reg); 152 return(in8(RTC_PORT_MC146818+1)); 153 } 154 155 static void rtc_write (uchar reg, uchar val) 156 { 157 out8(RTC_PORT_MC146818,reg); 158 out8(RTC_PORT_MC146818+1,val); 159 } 160 #endif 161 162 #endif 163