uboot-mt623x/drivers/rtc/s3c24x0_rtc.c

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/*
* (C) Copyright 2003
* David M<EFBFBD>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;
}
}
/* ------------------------------------------------------------------------- */
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