[U-Boot] [PATCH] =?utf-8?q?rtc:=20add=20support=20for=204543=20RTC=20(manufactured=20by=20e.g.=20EPSON)

[ap at denx.de <ap@denx.de>]

From: Andreas Pfefferle <ap@denx.de>

Signed-off-by: Andreas Pfefferle <ap@denx.de>
---
 drivers/rtc/Makefile  |    1 +
 drivers/rtc/rtc4543.c |  107 +++++++++++++++++++++++++++++++++++++++++++++++++
 include/rtc.h         |    4 ++
 3 files changed, 112 insertions(+), 0 deletions(-)
 create mode 100644 drivers/rtc/rtc4543.c

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 94bc518..6adece2 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -55,6 +55,7 @@ COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
 COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
 COBJS-$(CONFIG_RTC_PL031) += pl031.o
 COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o
+COBJS-$(CONFIG_RTC_RTC4543) += rtc4543.o
 COBJS-$(CONFIG_RTC_RX8025) += rx8025.o
 COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o
 COBJS-$(CONFIG_RTC_X1205) += x1205.o
diff --git a/drivers/rtc/rtc4543.c b/drivers/rtc/rtc4543.c
new file mode 100644
index 0000000..d2a6240
--- /dev/null
+++ b/drivers/rtc/rtc4543.c
@@ -0,0 +1,107 @@
+/*
+ * (C) Copyright 2008
+ * Andreas Pfefferle, DENX Software Engineering, ap at denx.de.
+ *
+ * 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 <asm/io.h>
+#include <common.h>
+#include <command.h>
+#include <config.h>
+#include <bcd.h>
+#include <rtc.h>
+
+#if defined(CONFIG_RTC_RTC4543) && defined(CONFIG_CMD_DATE)
+
+int rtc_get(struct rtc_time *tmp)
+{
+	int rel = 0;
+	uchar sec, min, hour, mday, wday, mon, year;
+
+	rtc_read(0x00);
+	sec	= rtc_read(0x01);
+	min	= rtc_read(0x02);
+	hour	= rtc_read(0x03);
+	wday	= rtc_read(0x04);
+	mday	= rtc_read(0x05);
+	mon	= rtc_read(0x06);
+	year	= rtc_read(0x07);
+	rtc_read(0x08);
+
+	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);
+
+	if (sec & 0x80) {
+		puts("### Warning: RTC Low Voltage - date/time not reliable\n");
+		rel = -1;
+	}
+
+	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);
+	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 rel;
+}
+
+int rtc_set(struct rtc_time *tmp)
+{
+	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);
+
+	rtc_write(0x00, 0);
+	rtc_write(0x01, BIN2BCD(tmp->tm_sec));
+	rtc_write(0x02, BIN2BCD(tmp->tm_min));
+	rtc_write(0x03, BIN2BCD(tmp->tm_hour));
+	rtc_write(0x04, BIN2BCD(tmp->tm_wday));
+	rtc_write(0x05, BIN2BCD(tmp->tm_mday));
+	rtc_write(0x06, BIN2BCD(tmp->tm_mon));
+	rtc_write(0x07, BIN2BCD(tmp->tm_year  % 100));
+	rtc_write(0x08, 0);
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+  struct rtc_time tmp;
+  tmp.tm_sec = 0;
+  tmp.tm_min = 0;
+  tmp.tm_hour = 0;
+  tmp.tm_wday = 4;
+  tmp.tm_mday = 1;
+  tmp.tm_mon = 1;
+  tmp.tm_year = 1970;
+  rtc_set(&tmp);
+}
+
+#endif
diff --git a/include/rtc.h b/include/rtc.h
index 785fbe3..019c2eb 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -61,4 +61,8 @@ void to_tm (int, struct rtc_time *);
 unsigned long mktime (unsigned int, unsigned int, unsigned int,
 		      unsigned int, unsigned int, unsigned int);
 
+uchar rtc_read(uchar reg) __attribute__((weak));
+void  rtc_write(uchar reg, uchar val) __attribute__((weak));
+
+
 #endif	/* _RTC_H_ */
-- 
1.6.0.4