diff options
Diffstat (limited to 'drivers/rtc/s3c24x0_rtc.c')
| -rw-r--r-- | drivers/rtc/s3c24x0_rtc.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/rtc/s3c24x0_rtc.c b/drivers/rtc/s3c24x0_rtc.c new file mode 100644 index 0000000000..7f8b4fad0d --- /dev/null +++ b/drivers/rtc/s3c24x0_rtc.c @@ -0,0 +1,178 @@ +/* + * (C) Copyright 2003 + * David Müller 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_RTC_S3C24X0) && (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)); +} + +/* ------------------------------------------------------------------------- */ + +void 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 +} + +void 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); +} + +void rtc_reset (void) +{ + S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC(); + + rtc->RTCCON = (rtc->RTCCON & ~0x06) | 0x08; + rtc->RTCCON &= ~(0x08|0x01); +} + +#endif |