/* * (C) Copyright 2003 * David M�ller ELSOFT AG Switzerland. d.mueller@elsoft.ch * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Date & Time support for the built-in Samsung S3C24X0 RTC */ #include <common.h> #include <command.h> #if (defined(CONFIG_CMD_DATE)) #if defined(CONFIG_S3C2400) #include <s3c2400.h> #elif defined(CONFIG_S3C2410) #include <s3c2410.h> #endif #include <rtc.h> /*#define DEBUG*/ typedef enum { RTC_ENABLE, RTC_DISABLE } RTC_ACCESS; static inline void SetRTC_Access(RTC_ACCESS a) { S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); switch (a) { case RTC_ENABLE: rtc->RTCCON |= 0x01; break; case RTC_DISABLE: rtc->RTCCON &= ~0x01; break; } } static unsigned bcd2bin (uchar n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } /* ------------------------------------------------------------------------- */ int rtc_get (struct rtc_time *tmp) { S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); uchar sec, min, hour, mday, wday, mon, year; uchar a_sec,a_min, a_hour, a_date, a_mon, a_year, a_armed; /* enable access to RTC registers */ SetRTC_Access(RTC_ENABLE); /* read RTC registers */ do { sec = rtc->BCDSEC; min = rtc->BCDMIN; hour = rtc->BCDHOUR; mday = rtc->BCDDATE; wday = rtc->BCDDAY; mon = rtc->BCDMON; year = rtc->BCDYEAR; } while (sec != rtc->BCDSEC); /* read ALARM registers */ a_sec = rtc->ALMSEC; a_min = rtc->ALMMIN; a_hour = rtc->ALMHOUR; a_date = rtc->ALMDATE; a_mon = rtc->ALMMON; a_year = rtc->ALMYEAR; a_armed = rtc->RTCALM; /* disable access to RTC registers */ SetRTC_Access(RTC_DISABLE); #ifdef RTC_DEBUG printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " "hr: %02x min: %02x sec: %02x\n", year, mon, mday, wday, hour, min, sec); printf ( "Alarms: %02x: year: %02x month: %02x date: %02x hour: %02x min: %02x sec: %02x\n", a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec); #endif tmp->tm_sec = bcd2bin(sec & 0x7F); tmp->tm_min = bcd2bin(min & 0x7F); tmp->tm_hour = bcd2bin(hour & 0x3F); tmp->tm_mday = bcd2bin(mday & 0x3F); tmp->tm_mon = bcd2bin(mon & 0x1F); tmp->tm_year = bcd2bin(year); tmp->tm_wday = bcd2bin(wday & 0x07); if(tmp->tm_year<70) tmp->tm_year+=2000; else tmp->tm_year+=1900; tmp->tm_yday = 0; tmp->tm_isdst= 0; #ifdef RTC_DEBUG printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif return 0; } int rtc_set (struct rtc_time *tmp) { S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); uchar sec, min, hour, mday, wday, mon, year; #ifdef RTC_DEBUG printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif year = bin2bcd(tmp->tm_year % 100); mon = bin2bcd(tmp->tm_mon); wday = bin2bcd(tmp->tm_wday); mday = bin2bcd(tmp->tm_mday); hour = bin2bcd(tmp->tm_hour); min = bin2bcd(tmp->tm_min); sec = bin2bcd(tmp->tm_sec); /* enable access to RTC registers */ SetRTC_Access(RTC_ENABLE); /* write RTC registers */ rtc->BCDSEC = sec; rtc->BCDMIN = min; rtc->BCDHOUR = hour; rtc->BCDDATE = mday; rtc->BCDDAY = wday; rtc->BCDMON = mon; rtc->BCDYEAR = year; /* disable access to RTC registers */ SetRTC_Access(RTC_DISABLE); return 0; } void rtc_reset (void) { S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); rtc->RTCCON = (rtc->RTCCON & ~0x06) | 0x08; rtc->RTCCON &= ~(0x08|0x01); } #endif