Add definitions for the Dallas DS1742 RTC / non-volatile memory.

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

include/linux/ds1742rtc.h

+/*
+ * ds1742rtc.h - register definitions for the Real-Time-Clock / CMOS RAM
+ *
+ * Copyright (C) 1999-2001 Toshiba Corporation
+ * Copyright (C) 2003 Ralf Baechle (ralf@linux-mips.org)
+ *
+ * Permission is hereby granted to copy, modify and redistribute this code
+ * in terms of the GNU Library General Public License, Version 2 or later,
+ * at your option.
+ */
+#ifndef __LINUX_DS1742RTC_H
+#define __LINUX_DS1742RTC_H
+
+#include <asm/ds1742.h>
+
+#define RTC_BRAM_SIZE		0x800
+#define RTC_OFFSET		0x7f8
+
+/*
+ * Register summary
+ */
+#define RTC_CONTROL		(RTC_OFFSET + 0)
+#define RTC_CENTURY		(RTC_OFFSET + 0)
+#define RTC_SECONDS		(RTC_OFFSET + 1)
+#define RTC_MINUTES		(RTC_OFFSET + 2)
+#define RTC_HOURS		(RTC_OFFSET + 3)
+#define RTC_DAY			(RTC_OFFSET + 4)
+#define RTC_DATE		(RTC_OFFSET + 5)
+#define RTC_MONTH		(RTC_OFFSET + 6)
+#define RTC_YEAR		(RTC_OFFSET + 7)
+
+#define RTC_CENTURY_MASK	0x3f
+#define RTC_SECONDS_MASK	0x7f
+#define RTC_DAY_MASK		0x07
+
+/*
+ * Bits in the Control/Century register
+ */
+#define RTC_WRITE		0x80
+#define RTC_READ		0x40
+
+/*
+ * Bits in the Seconds register
+ */
+#define RTC_STOP		0x80
+
+/*
+ * Bits in the Day register
+ */
+#define RTC_BATT_FLAG		0x80
+#define RTC_FREQ_TEST		0x40
+
+#endif /* __LINUX_DS1742RTC_H */