--- zzzz-none-000/linux-2.6.28.10/include/linux/clockchips.h	2009-05-02 18:54:43.000000000 +0000
+++ puma5-6360-529/linux-2.6.28.10/include/linux/clockchips.h	2010-05-06 10:48:52.000000000 +0000
@@ -114,6 +114,28 @@
 	return (unsigned long) tmp;
 }
 
+/**
+ * clockevent_set_clock - calculates an appropriate shift
+ * and mult values for a clockevent given a
+ * known clock frequency
+ * @dev: Clockevent device to initialize
+ * @hz: Clockevent clock frequency in Hz
+ */
+static inline void clockevent_set_clock(struct clock_event_device *dev, u32 hz)
+{
+    u64 temp;
+    u32 shift;
+    for (shift = 32; shift > 0; shift--) {
+        temp = (u64) hz << shift;
+        do_div(temp, NSEC_PER_SEC);
+        if ((temp >> 32) == 0)
+            break;
+    }
+    dev->shift = shift;
+    dev->mult = (u32) temp;
+}
+
+
 /* Clock event layer functions */
 extern unsigned long clockevent_delta2ns(unsigned long latch,
 					 struct clock_event_device *evt);