add a RTC driver for the Samsung S3C2440 used in the Gigabeat

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11662 a1c6a512-1295-4272-9138-f99709370657

firmware/drivers/rtc/rtc_s3c2440.c

@@ -0,0 +1,57 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "i2c.h"
+#include "rtc.h"
+#include "kernel.h"
+#include "system.h"
+#include <stdbool.h>
+
+void rtc_init(void)
+{
+    /* RTC Enable */
+    RTCCON |= 1;
+}
+
+int rtc_read_datetime(unsigned char* buf)
+{
+    buf[0] = BCDSEC;
+    buf[1] = BCDMIN;
+    buf[2] = BCDHOUR;
+    buf[3] = BCDDAY;
+    buf[4] = BCDDATE;
+    buf[5] = BCDMON;
+    buf[6] = BCDYEAR;
+
+    return 1;
+}
+
+int rtc_write_datetime(unsigned char* buf)
+{
+    BCDSEC  = buf[0];
+    BCDMIN  = buf[1];
+    BCDHOUR = buf[2];
+    BCDDAY  = buf[3];
+    BCDDATE = buf[4];
+    BCDMON  = buf[5];
+    BCDYEAR = buf[6];
+
+    return 1;
+}
+