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diff --git a/include/asm-sparc64/timer.h b/include/asm-sparc64/timer.h
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+++ b/include/asm-sparc64/timer.h
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+/* $Id: timer.h,v 1.1 1997/08/05 09:44:55 ralf Exp $
+ * timer.h: System timer definitions for sun5.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef _SPARC64_TIMER_H
+#define _SPARC64_TIMER_H
+
+/* How timers work:
+ *
+ * On uniprocessors we just use counter zero for the system wide
+ * ticker, this performs thread scheduling, clock book keeping,
+ * and runs timer based events.  Previously we used the Ultra
+ * %tick interrupt for this purpose.
+ *
+ * On multiprocessors we pick one cpu as the master level 10 tick
+ * processor.  Here this counter zero tick handles clock book
+ * keeping and timer events only.  Each Ultra has it's level
+ * 14 %tick interrupt set to fire off as well, even the master
+ * tick cpu runs this locally.  This ticker performs thread
+ * scheduling, system/user tick counting for the current thread,
+ * and also profiling if enabled.
+ */
+
+/* Two timers, traditionally steered to PIL's 10 and 14 respectively.
+ * But since INO packets are used on sun5, we could use any PIL level
+ * we like, however for now we use the normal ones.
+ *
+ * The 'reg' and 'interrupts' properties for these live in nodes named
+ * 'counter-timer'.  The first of three 'reg' properties describe where
+ * the sun5_timer registers are.  The other two I have no idea. (XXX)
+ */
+struct sun5_timer {
+	u64	count0;
+	u64	limit0;
+	u64	count1;
+	u64	limit1;
+};
+
+#define SUN5_LIMIT_ENABLE	0x80000000
+#define SUN5_LIMIT_TOZERO	0x40000000
+#define SUN5_LIMIT_ZRESTART	0x20000000
+#define SUN5_LIMIT_CMASK	0x1fffffff
+
+/* Given a HZ value, set the limit register to so that the timer IRQ
+ * gets delivered that often.
+ */
+#define SUN5_HZ_TO_LIMIT(__hz)  (1000000/(__hz))
+
+#endif /* _SPARC64_TIMER_H */