1 files changed, 36 insertions, 0 deletions

diff --git a/include/asm-powerpc/mc146818rtc.h b/include/asm-powerpc/mc146818rtc.h
new file mode 100644
index 000000000000..a5619a2a1393
--- /dev/null
+++ b/include/asm-powerpc/mc146818rtc.h
@@ -0,0 +1,36 @@
+#ifndef _POWERPC_MC146818RTC_H
+#define _POWERPC_MC146818RTC_H
+
+/*
+ * Machine dependent access functions for RTC registers.
+ *
+ * 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.
+ */
+
+#ifdef __KERNEL__
+
+#include <asm/io.h>
+
+#ifndef RTC_PORT
+#define RTC_PORT(x)     (0x70 + (x))
+#define RTC_ALWAYS_BCD  1       /* RTC operates in binary mode */
+#endif
+
+/*
+ * The yet supported machines all access the RTC index register via
+ * an ISA port access but the way to access the date register differs ...
+ */
+#define CMOS_READ(addr) ({ \
+outb_p((addr),RTC_PORT(0)); \
+inb_p(RTC_PORT(1)); \
+})
+#define CMOS_WRITE(val, addr) ({ \
+outb_p((addr),RTC_PORT(0)); \
+outb_p((val),RTC_PORT(1)); \
+})
+
+#endif  /* __KERNEL__ */
+#endif  /* _POWERPC_MC146818RTC_H */