Merge commit '87ddedd'

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 0000000..7f8b4fa
--- /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