[U-Boot] [PATCH 4/7] S3C24XX: Add RTC driver

[José Miguel Gonçalves]

RTC driver for the S3C24XX SoCs.

Signed-off-by: José Miguel Gonçalves <jose.goncalves at inov.pt>
---
 drivers/rtc/Makefile      |    1 +
 drivers/rtc/s3c24xx_rtc.c |  166 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 167 insertions(+)
 create mode 100644 drivers/rtc/s3c24xx_rtc.c

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 8316e8f..bd8b1eb 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -69,6 +69,7 @@ COBJS-$(CONFIG_RTC_RTC4543) += rtc4543.o
 COBJS-$(CONFIG_RTC_RV3029) += rv3029.o
 COBJS-$(CONFIG_RTC_RX8025) += rx8025.o
 COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o
+COBJS-$(CONFIG_RTC_S3C24XX) += s3c24xx_rtc.o
 COBJS-$(CONFIG_RTC_S3C44B0) += s3c44b0_rtc.o
 COBJS-$(CONFIG_RTC_X1205) += x1205.o
 
diff --git a/drivers/rtc/s3c24xx_rtc.c b/drivers/rtc/s3c24xx_rtc.c
new file mode 100644
index 0000000..3844e44
--- /dev/null
+++ b/drivers/rtc/s3c24xx_rtc.c
@@ -0,0 +1,166 @@
+/*
+ * (C) Copyright 2012 INOV - INESC Inovacao
+ * Jose Goncalves <jose.goncalves at inov.pt>
+ *
+ * Based on drivers/rtc/s3c24x0_rtc.c
+ *
+ * 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
+ */
+
+#include <common.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+#include <rtc.h>
+#include <asm/io.h>
+#include <asm/arch/s3c24xx_cpu.h>
+
+static inline void rtc_access_enable(void)
+{
+	s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc();
+	uchar rtccon;
+
+	rtccon = readb(&rtc->rtccon);
+	rtccon |= 0x01;
+	writeb(rtccon, &rtc->rtccon);
+}
+
+static inline void rtc_access_disable(void)
+{
+	s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc();
+	uchar rtccon;
+
+	rtccon = readb(&rtc->rtccon);
+	rtccon &= ~0x01;
+	writeb(rtccon, &rtc->rtccon);
+}
+
+/* ------------------------------------------------------------------------- */
+
+int rtc_get(struct rtc_time *tmp)
+{
+	s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc();
+	uchar sec, min, hour, mday, wday, mon, year;
+	int have_retried = 0;
+
+	rtc_access_enable();
+
+	/* Read RTC registers */
+retry_get_time:
+	min = readb(&rtc->bcdmin);
+	hour = readb(&rtc->bcdhour);
+	mday = readb(&rtc->bcddate);
+	wday = readb(&rtc->bcdday);
+	mon = readb(&rtc->bcdmon);
+	year = readb(&rtc->bcdyear);
+	sec = readb(&rtc->bcdsec);
+
+	/* The only way to work out whether the RTC was mid-update
+	 * when we read it is to check the seconds counter.
+	 * If it's zero, then we re-try the entire read.
+	 */
+	if (rtc->bcdsec == 0 && !have_retried) {
+		have_retried = 1;
+		goto retry_get_time;
+	}
+
+	rtc_access_disable();
+
+	debug("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);
+
+	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_wday = bcd2bin(wday & 0x07);
+	tmp->tm_mon = bcd2bin(mon & 0x1F);
+	tmp->tm_year = bcd2bin(year);
+	if (tmp->tm_year < 70)
+		tmp->tm_year += 2000;
+	else
+		tmp->tm_year += 1900;
+	tmp->tm_yday = 0;
+	tmp->tm_isdst = 0;
+
+	debug("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);
+
+	return 0;
+}
+
+int rtc_set(struct rtc_time *tmp)
+{
+	s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc();
+	uchar sec, min, hour, mday, wday, mon, year;
+
+	debug("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);
+
+	if (tmp->tm_year < 1970 || tmp->tm_year > 2069) {
+		puts("ERROR: year should be between 1970 and 2069!\n");
+		return -1;
+	}
+
+	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);
+
+	debug("Set RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
+	      "hr: %02x min: %02x sec: %02x\n",
+	      year, mon, mday, wday, hour, min, sec);
+
+	rtc_access_enable();
+
+	/* Write RTC registers */
+	writeb(sec, &rtc->bcdsec);
+	writeb(min, &rtc->bcdmin);
+	writeb(hour, &rtc->bcdhour);
+	writeb(mday, &rtc->bcddate);
+	writeb(wday, &rtc->bcdday);
+	writeb(mon, &rtc->bcdmon);
+	writeb(year, &rtc->bcdyear);
+
+	rtc_access_disable();
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	s3c24xx_rtc *const rtc = s3c24xx_get_base_rtc();
+	uchar rtccon;
+
+	rtccon = readb(&rtc->rtccon);
+	rtccon &= ~0x06;
+	rtccon |= 0x08;
+	writeb(rtccon, &rtc->rtccon);
+	rtccon = readb(&rtc->rtccon);
+	rtccon &= ~0x08;
+	writeb(rtccon, &rtc->rtccon);
+}
+
+#endif
-- 
1.7.9.5