1 /* 2 * (C) Copyright 2003 3 * David Müller 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 #include <asm/arch/s3c24x0_cpu.h> 34 35 #include <rtc.h> 36 #include <asm/io.h> 37 #include <linux/compiler.h> 38 39 typedef enum { 40 RTC_ENABLE, 41 RTC_DISABLE 42 } RTC_ACCESS; 43 44 45 static inline void SetRTC_Access(RTC_ACCESS a) 46 { 47 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 48 49 switch (a) { 50 case RTC_ENABLE: 51 writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon); 52 break; 53 54 case RTC_DISABLE: 55 writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon); 56 break; 57 } 58 } 59 60 /* ------------------------------------------------------------------------- */ 61 62 int rtc_get(struct rtc_time *tmp) 63 { 64 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 65 uchar sec, min, hour, mday, wday, mon, year; 66 __maybe_unused uchar a_sec, a_min, a_hour, a_date, 67 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 = readb(&rtc->bcdsec); 75 min = readb(&rtc->bcdmin); 76 hour = readb(&rtc->bcdhour); 77 mday = readb(&rtc->bcddate); 78 wday = readb(&rtc->bcdday); 79 mon = readb(&rtc->bcdmon); 80 year = readb(&rtc->bcdyear); 81 } while (sec != readb(&rtc->bcdsec)); 82 83 /* read ALARM registers */ 84 a_sec = readb(&rtc->almsec); 85 a_min = readb(&rtc->almmin); 86 a_hour = readb(&rtc->almhour); 87 a_date = readb(&rtc->almdate); 88 a_mon = readb(&rtc->almmon); 89 a_year = readb(&rtc->almyear); 90 a_armed = readb(&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, hour, min, sec); 99 printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: " 100 "%02x min: %02x sec: %02x\n", 101 a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec); 102 #endif 103 104 tmp->tm_sec = bcd2bin(sec & 0x7F); 105 tmp->tm_min = bcd2bin(min & 0x7F); 106 tmp->tm_hour = bcd2bin(hour & 0x3F); 107 tmp->tm_mday = bcd2bin(mday & 0x3F); 108 tmp->tm_mon = bcd2bin(mon & 0x1F); 109 tmp->tm_year = bcd2bin(year); 110 tmp->tm_wday = bcd2bin(wday & 0x07); 111 if (tmp->tm_year < 70) 112 tmp->tm_year += 2000; 113 else 114 tmp->tm_year += 1900; 115 tmp->tm_yday = 0; 116 tmp->tm_isdst = 0; 117 #ifdef RTC_DEBUG 118 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 119 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 120 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 121 #endif 122 123 return 0; 124 } 125 126 int rtc_set(struct rtc_time *tmp) 127 { 128 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 129 uchar sec, min, hour, mday, wday, mon, year; 130 131 #ifdef RTC_DEBUG 132 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 133 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 134 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 135 #endif 136 year = bin2bcd(tmp->tm_year % 100); 137 mon = bin2bcd(tmp->tm_mon); 138 wday = bin2bcd(tmp->tm_wday); 139 mday = bin2bcd(tmp->tm_mday); 140 hour = bin2bcd(tmp->tm_hour); 141 min = bin2bcd(tmp->tm_min); 142 sec = bin2bcd(tmp->tm_sec); 143 144 /* enable access to RTC registers */ 145 SetRTC_Access(RTC_ENABLE); 146 147 /* write RTC registers */ 148 writeb(sec, &rtc->bcdsec); 149 writeb(min, &rtc->bcdmin); 150 writeb(hour, &rtc->bcdhour); 151 writeb(mday, &rtc->bcddate); 152 writeb(wday, &rtc->bcdday); 153 writeb(mon, &rtc->bcdmon); 154 writeb(year, &rtc->bcdyear); 155 156 /* disable access to RTC registers */ 157 SetRTC_Access(RTC_DISABLE); 158 159 return 0; 160 } 161 162 void rtc_reset(void) 163 { 164 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 165 166 writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon); 167 writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon); 168 } 169 170 #endif 171