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path: root/drivers/rtc/rv3029.c
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Diffstat (limited to 'drivers/rtc/rv3029.c')
-rw-r--r--drivers/rtc/rv3029.c124
1 files changed, 124 insertions, 0 deletions
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);
+}