diff --git a/include/asm-mips/mach-atlas/mc146818rtc.h b/include/asm-mips/mach-atlas/mc146818rtc.h
new file mode 100644
index 0000000..397522e
--- /dev/null
+++ b/include/asm-mips/mach-atlas/mc146818rtc.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 1999, 2000, 2005  MIPS Technologies, Inc.
+ *	All rights reserved.
+ *	Authors: Carsten Langgaard <carstenl@mips.com>
+ *		 Maciej W. Rozycki <macro@mips.com>
+ * Copyright (C) 2003, 05 Ralf Baechle (ralf@linux-mips.org)
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+#ifndef __ASM_MACH_ATLAS_MC146818RTC_H
+#define __ASM_MACH_ATLAS_MC146818RTC_H
+
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+
+#include <asm/mips-boards/atlas.h>
+#include <asm/mips-boards/atlasint.h>
+
+#define RTC_PORT(x)	(ATLAS_RTC_ADR_REG + (x) * 8)
+#define RTC_IO_EXTENT	0x100
+#define RTC_IOMAPPED	0
+#define RTC_IRQ		ATLASINT_RTC
+
+static inline unsigned char CMOS_READ(unsigned long addr)
+{
+	volatile u32 *ireg = (void *)CKSEG1ADDR(RTC_PORT(0));
+	volatile u32 *dreg = (void *)CKSEG1ADDR(RTC_PORT(1));
+
+	*ireg = addr;
+	return *dreg;
+}
+
+static inline void CMOS_WRITE(unsigned char data, unsigned long addr)
+{
+	volatile u32 *ireg = (void *)CKSEG1ADDR(RTC_PORT(0));
+	volatile u32 *dreg = (void *)CKSEG1ADDR(RTC_PORT(1));
+
+	*ireg = addr;
+	*dreg = data;
+}
+
+#define RTC_ALWAYS_BCD	0
+
+#define mc146818_decode_year(year) ((year) < 70 ? (year) + 2000 : (year) + 1970)
+
+#endif /* __ASM_MACH_ATLAS_MC146818RTC_H */