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>

diff --git a/README b/README
index 956c694faf2e7bbd1cb0cf84d211a5fbe887317e..36ae0fb5ea3694245bb772210a4a2a9463c0db77 100644 (file)
--- a/README
+++ b/README
@@ -672,6 +672,7 @@ The following options need to be configured:
 
                CONFIG_RTC_MPC8xx       - use internal RTC of MPC8xx
                CONFIG_RTC_PCF8563      - use Philips PCF8563 RTC
+               CONFIG_RTC_MC13783      - use MC13783 RTC
                CONFIG_RTC_MC146818     - use MC146818 RTC
                CONFIG_RTC_DS1307       - use Maxim, Inc. DS1307 RTC
                CONFIG_RTC_DS1337       - use Maxim, Inc. DS1337 RTC

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 800ab9934ae7a13f75b7475df3f307c23cc9ab82..2e0c1183b4449d5a061e141aad5634ce02c363e1 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -45,6 +45,7 @@ COBJS-y += m41t60.o
 COBJS-$(CONFIG_RTC_M41T62) += m41t62.o
 COBJS-y += m48t35ax.o
 COBJS-y += max6900.o
+COBJS-$(CONFIG_RTC_MC13783) += mc13783-rtc.o
 COBJS-y += mc146818.o
 COBJS-y += mcfrtc.o
 COBJS-y += mk48t59.o

diff --git a/drivers/rtc/mc13783-rtc.c b/drivers/rtc/mc13783-rtc.c
new file mode 100644 (file)
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)
+{
+}