1 /* 2 * (C) Copyright 2003 3 * David M�ller ELSOFT AG Switzerland. d.mueller@elsoft.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 built-in Samsung S3C24X0 RTC 26 */ 27 28 #include <common.h> 29 #include <command.h> 30 31 #if (defined(CONFIG_CMD_DATE)) 32 33 #if defined(CONFIG_S3C2400) 34 #include <s3c2400.h> 35 #elif defined(CONFIG_S3C2410) 36 #include <s3c2410.h> 37 #endif 38 39 #include <rtc.h> 40 41 /*#define DEBUG*/ 42 43 typedef enum { 44 RTC_ENABLE, 45 RTC_DISABLE 46 } RTC_ACCESS; 47 48 49 static inline void SetRTC_Access(RTC_ACCESS a) 50 { 51 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 52 switch (a) { 53 case RTC_ENABLE: 54 rtc->RTCCON |= 0x01; break; 55 56 case RTC_DISABLE: 57 rtc->RTCCON &= ~0x01; break; 58 } 59 } 60 61 /* ------------------------------------------------------------------------- */ 62 63 int rtc_get (struct rtc_time *tmp) 64 { 65 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 66 uchar sec, min, hour, mday, wday, mon, year; 67 uchar a_sec,a_min, a_hour, a_date, a_mon, a_year, a_armed; 68 69 /* enable access to RTC registers */ 70 SetRTC_Access(RTC_ENABLE); 71 72 /* read RTC registers */ 73 do { 74 sec = rtc->BCDSEC; 75 min = rtc->BCDMIN; 76 hour = rtc->BCDHOUR; 77 mday = rtc->BCDDATE; 78 wday = rtc->BCDDAY; 79 mon = rtc->BCDMON; 80 year = rtc->BCDYEAR; 81 } while (sec != rtc->BCDSEC); 82 83 /* read ALARM registers */ 84 a_sec = rtc->ALMSEC; 85 a_min = rtc->ALMMIN; 86 a_hour = rtc->ALMHOUR; 87 a_date = rtc->ALMDATE; 88 a_mon = rtc->ALMMON; 89 a_year = rtc->ALMYEAR; 90 a_armed = rtc->RTCALM; 91 92 /* disable access to RTC registers */ 93 SetRTC_Access(RTC_DISABLE); 94 95 #ifdef RTC_DEBUG 96 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 97 "hr: %02x min: %02x sec: %02x\n", 98 year, mon, mday, wday, 99 hour, min, sec); 100 printf ( "Alarms: %02x: year: %02x month: %02x date: %02x hour: %02x min: %02x sec: %02x\n", 101 a_armed, 102 a_year, a_mon, a_date, 103 a_hour, a_min, a_sec); 104 #endif 105 106 tmp->tm_sec = bcd2bin(sec & 0x7F); 107 tmp->tm_min = bcd2bin(min & 0x7F); 108 tmp->tm_hour = bcd2bin(hour & 0x3F); 109 tmp->tm_mday = bcd2bin(mday & 0x3F); 110 tmp->tm_mon = bcd2bin(mon & 0x1F); 111 tmp->tm_year = bcd2bin(year); 112 tmp->tm_wday = bcd2bin(wday & 0x07); 113 if(tmp->tm_year<70) 114 tmp->tm_year+=2000; 115 else 116 tmp->tm_year+=1900; 117 tmp->tm_yday = 0; 118 tmp->tm_isdst= 0; 119 #ifdef RTC_DEBUG 120 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 121 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 122 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 123 #endif 124 125 return 0; 126 } 127 128 int rtc_set (struct rtc_time *tmp) 129 { 130 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 131 uchar sec, min, hour, mday, wday, mon, year; 132 133 #ifdef RTC_DEBUG 134 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 135 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 136 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 137 #endif 138 year = bin2bcd(tmp->tm_year % 100); 139 mon = bin2bcd(tmp->tm_mon); 140 wday = bin2bcd(tmp->tm_wday); 141 mday = bin2bcd(tmp->tm_mday); 142 hour = bin2bcd(tmp->tm_hour); 143 min = bin2bcd(tmp->tm_min); 144 sec = bin2bcd(tmp->tm_sec); 145 146 /* enable access to RTC registers */ 147 SetRTC_Access(RTC_ENABLE); 148 149 /* write RTC registers */ 150 rtc->BCDSEC = sec; 151 rtc->BCDMIN = min; 152 rtc->BCDHOUR = hour; 153 rtc->BCDDATE = mday; 154 rtc->BCDDAY = wday; 155 rtc->BCDMON = mon; 156 rtc->BCDYEAR = year; 157 158 /* disable access to RTC registers */ 159 SetRTC_Access(RTC_DISABLE); 160 161 return 0; 162 } 163 164 void rtc_reset (void) 165 { 166 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 167 168 rtc->RTCCON = (rtc->RTCCON & ~0x06) | 0x08; 169 rtc->RTCCON &= ~(0x08|0x01); 170 } 171 172 #endif 173