[ARM] 3981/1: sched_clock for PXA2xx

Here's a 63-bit implementation of shed_clock() for PXA2xx.  The actual
period depends on the value of CLOCK_TICK_RATE and whether or not
reduced scaling factors were provided for it.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 60 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 45fb2c3bcf82..6ae605857ca9 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -25,6 +25,10 @@
 #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>
@@ -41,6 +45,62 @@
 #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 which 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
  */