[ARM] 4550/1: sched_clock on PXA should cope with run time clock rate selection

[linux-2.6-omap-h63xx.git] / arch / arm / mach-pxa / generic.c

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 5510f6fdce55e4dc8b2f55f93359e1b245da619a..9d6a2c00d7628de71def0616e5411593c5facc46 100644 (file)
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -25,10 +25,6 @@
 #include <linux/pm.h>
 #include <linux/string.h>
 
-#include <linux/sched.h>
-#include <asm/cnt32_to_63.h>
-#include <asm/div64.h>
-
 #include <asm/hardware.h>
 #include <asm/irq.h>
 #include <asm/system.h>
@@ -46,64 +42,6 @@
 #include "devices.h"
 #include "generic.h"
 
-/*
- * This is the PXA2xx sched_clock implementation. This has a resolution
- * of at least 308ns and a maximum value that depends on the value of
- * CLOCK_TICK_RATE.
- *
- * 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.
- */
-unsigned long long sched_clock(void)
-{
-       unsigned long long v = cnt32_to_63(OSCR);
-       /* Note: top bit ov v needs cleared unless multiplier is even. */
-
-#if    CLOCK_TICK_RATE == 3686400
-       /* 1E9 / 3686400 => 78125 / 288, max value = 32025597s (370 days). */
-       /* The <<1 is used to get rid of tick.hi top bit */
-       v *= 78125<<1;
-       do_div(v, 288<<1);
-#elif  CLOCK_TICK_RATE == 3250000
-       /* 1E9 / 3250000 => 4000 / 13, max value = 709490156s (8211 days) */
-       v *= 4000;
-       do_div(v, 13);
-#elif  CLOCK_TICK_RATE == 3249600
-       /* 1E9 / 3249600 => 625000 / 2031, max value = 4541295s (52 days) */
-       v *= 625000;
-       do_div(v, 2031);
-#else
-#warning "consider fixing sched_clock for your value of CLOCK_TICK_RATE"
-       /*
-        * 96-bit math to perform tick * NSEC_PER_SEC / CLOCK_TICK_RATE for
-        * any value of CLOCK_TICK_RATE. Max value is in the 80 thousand
-        * years range and truncation to unsigned long long limits it to
-        * sched_clock's max range of ~584 years.  This is nice but with
-        * higher computation cost.
-        */
-       {
-               union {
-                       unsigned long long val;
-                       struct { unsigned long lo, hi; };
-               } x;
-               unsigned long long y;
-
-               x.val = v;
-               x.hi &= 0x7fffffff;
-               y = (unsigned long long)x.lo * NSEC_PER_SEC;
-               x.lo = y;
-               y = (y >> 32) + (unsigned long long)x.hi * NSEC_PER_SEC;
-               x.hi = do_div(y, CLOCK_TICK_RATE);
-               do_div(x.val, CLOCK_TICK_RATE);
-               x.hi += y;
-               v = x.val;
-       }
-#endif
-
-       return v;
-}
-
 /*
  * Handy function to set GPIO alternate functions
  */