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authorGuennadi Liakhovetski <lg@denx.de>2008-04-15 14:15:30 +0200
committerWolfgang Denk <wd@denx.de>2008-04-18 00:43:50 -0700
commit7ce63709828d37b08866e537339a169bd0db2bd3 (patch)
tree912416c27f198498202d04c06535b6acf44c03b0 /drivers/rtc/mc13783-rtc.c
parent38254f45b0b412332726c90d3184ad47479fcffb (diff)
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RTC driver for MC13783
MC13783 is a multifunction IS with an SPI interface to the host. This driver handles the RTC controller in this chip. Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Diffstat (limited to 'drivers/rtc/mc13783-rtc.c')
-rw-r--r--drivers/rtc/mc13783-rtc.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/rtc/mc13783-rtc.c b/drivers/rtc/mc13783-rtc.c
new file mode 100644
index 0000000..35b1b8b
--- /dev/null
+++ b/drivers/rtc/mc13783-rtc.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2008, Guennadi Liakhovetski <lg@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 <rtc.h>
+#include <spi.h>
+
+int rtc_get(struct rtc_time *rtc)
+{
+ u32 day1, day2, time;
+ u32 reg;
+ int err, tim, i = 0;
+
+ spi_select(1, 0, SPI_MODE_2 | SPI_CS_HIGH);
+
+ do {
+ reg = 0x2c000000;
+ err = spi_xfer(0, 32, (uchar *)&reg, (uchar *)&day1);
+
+ if (err)
+ return err;
+
+ reg = 0x28000000;
+ err = spi_xfer(0, 32, (uchar *)&reg, (uchar *)&time);
+
+ if (err)
+ return err;
+
+ reg = 0x2c000000;
+ err = spi_xfer(0, 32, (uchar *)&reg, (uchar *)&day2);
+
+ if (err)
+ return err;
+ } while (day1 != day2 && i++ < 3);
+
+ tim = day1 * 86400 + time;
+ to_tm(tim, rtc);
+
+ rtc->tm_yday = 0;
+ rtc->tm_isdst = 0;
+
+ return 0;
+}
+
+void rtc_set(struct rtc_time *rtc)
+{
+ u32 time, day, reg;
+
+ time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday,
+ rtc->tm_hour, rtc->tm_min, rtc->tm_sec);
+ day = time / 86400;
+ time %= 86400;
+
+ reg = 0x2c000000 | day | 0x80000000;
+ spi_xfer(0, 32, (uchar *)&reg, (uchar *)&day);
+
+ reg = 0x28000000 | time | 0x80000000;
+ spi_xfer(0, 32, (uchar *)&reg, (uchar *)&time);
+}
+
+void rtc_reset(void)
+{
+}