rtc: add support for Micro Crystal RV-3029-C2 RTC

Signed-off-by: Heiko Schocher <hs@denx.de>

2 files changed, 125 insertions, 0 deletions

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 916d73f..e4be4a4 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -60,6 +60,7 @@ COBJS-$(CONFIG_RTC_PL031) += pl031.o
 COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
 COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o
 COBJS-$(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_S3C44B0) += s3c44b0_rtc.o
diff --git a/drivers/rtc/rv3029.c b/drivers/rtc/rv3029.c
new file mode 100644
index 0000000..3ebc768
--- /dev/null
+++ b/drivers/rtc/rv3029.c
@@ -0,0 +1,124 @@
+/*
+ * (C) Copyright 2010
+ * Heiko Schocher, DENX Software Engineering, hs@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 <common.h>
+#include <command.h>
+#include <i2c.h>
+#include <rtc.h>
+
+#define RTC_RV3029_CTRL_RESET	0x04
+#define RTC_RV3029_CTRL_SYS_R	(1 << 4)
+
+#define RTC_RV3029_CLOCK_PAGE	0x08
+#define RTC_RV3029_PAGE_LEN	7
+
+#define RV3029C2_W_SECONDS	0x00
+#define RV3029C2_W_MINUTES	0x01
+#define RV3029C2_W_HOURS	0x02
+#define RV3029C2_W_DATE		0x03
+#define RV3029C2_W_DAYS		0x04
+#define RV3029C2_W_MONTHS	0x05
+#define RV3029C2_W_YEARS	0x06
+
+#define RV3029C2_REG_HR_12_24          (1 << 6)  /* 24h/12h mode */
+#define RV3029C2_REG_HR_PM             (1 << 5)  /* PM/AM bit in 12h mode */
+
+int rtc_get( struct rtc_time *tmp )
+{
+	int	ret;
+	unsigned char buf[RTC_RV3029_PAGE_LEN];
+
+	ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \
+			RTC_RV3029_PAGE_LEN);
+	if (ret) {
+		printf("%s: error reading RTC: %x\n", __func__, ret);
+		return -1;
+	}
+	tmp->tm_sec  = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f);
+	tmp->tm_min  = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f);
+	if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) {
+		/* 12h format */
+		tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f);
+		if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM)
+			/* PM flag set */
+			tmp->tm_hour += 12;
+	} else
+		tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f);
+
+	tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F );
+	tmp->tm_mon  = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F );
+	tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 );
+	/* RTC supports only years > 1999 */
+	tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000;
+	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 )
+{
+	int	ret;
+	unsigned char buf[RTC_RV3029_PAGE_LEN];
+#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
+
+	if (tmp->tm_year < 2000) {
+		printf("RTC: year %d < 2000 not possible\n", tmp->tm_year);
+		return -1;
+	}
+	buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec);
+	buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min);
+	buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour);
+	/* set 24h format */
+	buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24;
+	buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday);
+	buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday);
+	buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon);
+	tmp->tm_year -= 2000;
+	buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year);
+	ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1,
+			buf, RTC_RV3029_PAGE_LEN);
+
+	/* give the RTC some time to update */
+	udelay(1000);
+	return 0;
+}
+
+void rtc_reset (void)
+{
+	int	ret;
+	unsigned char buf[RTC_RV3029_PAGE_LEN];
+
+	buf[0] = RTC_RV3029_CTRL_SYS_R;
+	ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1,
+			buf, 1);
+}