fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / arm / mach-sa1100 / generic.c

diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index 4575f31..e510295 100644 (file)
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -20,6 +20,7 @@
 #include <linux/platform_device.h>
 
 #include <asm/div64.h>
+#include <asm/cnt32_to_63.h>
 #include <asm/hardware.h>
 #include <asm/system.h>
 #include <asm/pgtable.h>
@@ -118,15 +119,21 @@ EXPORT_SYMBOL(cpufreq_get);
 
 /*
  * This is the SA11x0 sched_clock implementation.  This has
- * a resolution of 271ns, and a maximum value of 1165s.
+ * a resolution of 271ns, and a maximum value of 32025597s (370 days).
+ *
+ * The return value is guaranteed to be monotonic in that range as
+ * long as there is always less than 582 seconds between successive
+ * calls to this function.
+ *
  *  ( * 1E9 / 3686400 => * 78125 / 288)
  */
 unsigned long long sched_clock(void)
 {
-       unsigned long long v;
+       unsigned long long v = cnt32_to_63(OSCR);
 
-       v = (unsigned long long)OSCR * 78125;
-       do_div(v, 288);
+       /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
+       v *= 78125<<1;
+       do_div(v, 288<<1);
 
        return v;
 }