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 static unsigned bcd2bin (uchar n) 62 { 63 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); 64 } 65 66 static unsigned char bin2bcd (unsigned int n) 67 { 68 return (((n / 10) << 4) | (n % 10)); 69 } 70 71 /* ------------------------------------------------------------------------- */ 72 73 int rtc_get (struct rtc_time *tmp) 74 { 75 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 76 uchar sec, min, hour, mday, wday, mon, year; 77 uchar a_sec,a_min, a_hour, a_date, a_mon, a_year, a_armed; 78 79 /* enable access to RTC registers */ 80 SetRTC_Access(RTC_ENABLE); 81 82 /* read RTC registers */ 83 do { 84 sec = rtc->BCDSEC; 85 min = rtc->BCDMIN; 86 hour = rtc->BCDHOUR; 87 mday = rtc->BCDDATE; 88 wday = rtc->BCDDAY; 89 mon = rtc->BCDMON; 90 year = rtc->BCDYEAR; 91 } while (sec != rtc->BCDSEC); 92 93 /* read ALARM registers */ 94 a_sec = rtc->ALMSEC; 95 a_min = rtc->ALMMIN; 96 a_hour = rtc->ALMHOUR; 97 a_date = rtc->ALMDATE; 98 a_mon = rtc->ALMMON; 99 a_year = rtc->ALMYEAR; 100 a_armed = rtc->RTCALM; 101 102 /* disable access to RTC registers */ 103 SetRTC_Access(RTC_DISABLE); 104 105 #ifdef RTC_DEBUG 106 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 107 "hr: %02x min: %02x sec: %02x\n", 108 year, mon, mday, wday, 109 hour, min, sec); 110 printf ( "Alarms: %02x: year: %02x month: %02x date: %02x hour: %02x min: %02x sec: %02x\n", 111 a_armed, 112 a_year, a_mon, a_date, 113 a_hour, a_min, a_sec); 114 #endif 115 116 tmp->tm_sec = bcd2bin(sec & 0x7F); 117 tmp->tm_min = bcd2bin(min & 0x7F); 118 tmp->tm_hour = bcd2bin(hour & 0x3F); 119 tmp->tm_mday = bcd2bin(mday & 0x3F); 120 tmp->tm_mon = bcd2bin(mon & 0x1F); 121 tmp->tm_year = bcd2bin(year); 122 tmp->tm_wday = bcd2bin(wday & 0x07); 123 if(tmp->tm_year<70) 124 tmp->tm_year+=2000; 125 else 126 tmp->tm_year+=1900; 127 tmp->tm_yday = 0; 128 tmp->tm_isdst= 0; 129 #ifdef RTC_DEBUG 130 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 131 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 132 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 133 #endif 134 135 return 0; 136 } 137 138 int rtc_set (struct rtc_time *tmp) 139 { 140 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 141 uchar sec, min, hour, mday, wday, mon, year; 142 143 #ifdef RTC_DEBUG 144 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 145 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 146 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 147 #endif 148 year = bin2bcd(tmp->tm_year % 100); 149 mon = bin2bcd(tmp->tm_mon); 150 wday = bin2bcd(tmp->tm_wday); 151 mday = bin2bcd(tmp->tm_mday); 152 hour = bin2bcd(tmp->tm_hour); 153 min = bin2bcd(tmp->tm_min); 154 sec = bin2bcd(tmp->tm_sec); 155 156 /* enable access to RTC registers */ 157 SetRTC_Access(RTC_ENABLE); 158 159 /* write RTC registers */ 160 rtc->BCDSEC = sec; 161 rtc->BCDMIN = min; 162 rtc->BCDHOUR = hour; 163 rtc->BCDDATE = mday; 164 rtc->BCDDAY = wday; 165 rtc->BCDMON = mon; 166 rtc->BCDYEAR = year; 167 168 /* disable access to RTC registers */ 169 SetRTC_Access(RTC_DISABLE); 170 171 return 0; 172 } 173 174 void rtc_reset (void) 175 { 176 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); 177 178 rtc->RTCCON = (rtc->RTCCON & ~0x06) | 0x08; 179 rtc->RTCCON &= ~(0x08|0x01); 180 } 181 182 #endif 183