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 #ifdef __I386__ 35 #include <asm/io.h> 36 #define in8(p) inb(p) 37 #define out8(p, v) outb(v, p) 38 #endif 39 40 #if defined(CONFIG_CMD_DATE) 41 42 static uchar rtc_read (uchar reg); 43 static void rtc_write (uchar reg, uchar val); 44 45 #define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70 46 #define RTC_SECONDS 0x00 47 #define RTC_SECONDS_ALARM 0x01 48 #define RTC_MINUTES 0x02 49 #define RTC_MINUTES_ALARM 0x03 50 #define RTC_HOURS 0x04 51 #define RTC_HOURS_ALARM 0x05 52 #define RTC_DAY_OF_WEEK 0x06 53 #define RTC_DATE_OF_MONTH 0x07 54 #define RTC_MONTH 0x08 55 #define RTC_YEAR 0x09 56 #define RTC_CONFIG_A 0x0A 57 #define RTC_CONFIG_B 0x0B 58 #define RTC_CONFIG_C 0x0C 59 #define RTC_CONFIG_D 0x0D 60 61 62 /* ------------------------------------------------------------------------- */ 63 64 int rtc_get (struct rtc_time *tmp) 65 { 66 uchar sec, min, hour, mday, wday, mon, year; 67 /* here check if rtc can be accessed */ 68 while((rtc_read(RTC_CONFIG_A)&0x80)==0x80); 69 sec = rtc_read (RTC_SECONDS); 70 min = rtc_read (RTC_MINUTES); 71 hour = rtc_read (RTC_HOURS); 72 mday = rtc_read (RTC_DATE_OF_MONTH); 73 wday = rtc_read (RTC_DAY_OF_WEEK); 74 mon = rtc_read (RTC_MONTH); 75 year = rtc_read (RTC_YEAR); 76 #ifdef RTC_DEBUG 77 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 78 "hr: %02x min: %02x sec: %02x\n", 79 year, mon, mday, wday, 80 hour, min, sec ); 81 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", 82 rtc_read (RTC_CONFIG_D) & 0x3F, 83 rtc_read (RTC_HOURS_ALARM), 84 rtc_read (RTC_MINUTES_ALARM), 85 rtc_read (RTC_SECONDS_ALARM) ); 86 #endif 87 tmp->tm_sec = bcd2bin (sec & 0x7F); 88 tmp->tm_min = bcd2bin (min & 0x7F); 89 tmp->tm_hour = bcd2bin (hour & 0x3F); 90 tmp->tm_mday = bcd2bin (mday & 0x3F); 91 tmp->tm_mon = bcd2bin (mon & 0x1F); 92 tmp->tm_year = bcd2bin (year); 93 tmp->tm_wday = bcd2bin (wday & 0x07); 94 if(tmp->tm_year<70) 95 tmp->tm_year+=2000; 96 else 97 tmp->tm_year+=1900; 98 tmp->tm_yday = 0; 99 tmp->tm_isdst= 0; 100 #ifdef RTC_DEBUG 101 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 102 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 103 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 104 #endif 105 106 return 0; 107 } 108 109 int rtc_set (struct rtc_time *tmp) 110 { 111 #ifdef RTC_DEBUG 112 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 113 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 114 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 115 #endif 116 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 117 118 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 119 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 120 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 121 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); 122 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 123 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 124 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 125 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 126 127 return 0; 128 } 129 130 void rtc_reset (void) 131 { 132 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 133 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ 134 rtc_write(RTC_CONFIG_B,0x00); 135 rtc_write(RTC_CONFIG_B,0x00); 136 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 137 } 138 139 /* ------------------------------------------------------------------------- */ 140 141 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR 142 /* 143 * use direct memory access 144 */ 145 static uchar rtc_read (uchar reg) 146 { 147 return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); 148 } 149 150 static void rtc_write (uchar reg, uchar val) 151 { 152 out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); 153 } 154 #else 155 static uchar rtc_read (uchar reg) 156 { 157 out8(RTC_PORT_MC146818,reg); 158 return(in8(RTC_PORT_MC146818+1)); 159 } 160 161 static void rtc_write (uchar reg, uchar val) 162 { 163 out8(RTC_PORT_MC146818,reg); 164 out8(RTC_PORT_MC146818+1,val); 165 } 166 #endif 167 168 #endif 169