Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (76 commits)
  [ARM] 4002/1: S3C24XX: leave parent IRQs unmasked
  [ARM] 4001/1: S3C24XX: shorten reboot time
  [ARM] 3983/2: remove unused argument to __bug()
  [ARM] 4000/1: Osiris: add third serial port in
  [ARM] 3999/1: RX3715: suspend to RAM support
  [ARM] 3998/1: VR1000: LED platform devices
  [ARM] 3995/1: iop13xx: add iop13xx support
  [ARM] 3968/1: iop13xx: add iop13xx_defconfig
  [ARM] Update mach-types
  [ARM] Allow gcc to optimise arm_add_memory a little more
  [ARM] 3991/1: i.MX/MX1 high resolution time source
  [ARM] 3990/1: i.MX/MX1 more precise PLL decode
  [ARM] 3986/1: H1940: suspend to RAM support
  [ARM] 3985/1: ixp4xx clocksource cleanup
  [ARM] 3984/1: ixp4xx/nslu2: Fix disk LED numbering (take 2)
  [ARM] 3994/1: ixp23xx: fix handling of pci master aborts
  [ARM] 3981/1: sched_clock for PXA2xx
  [ARM] 3980/1: extend the ARM Versatile sched_clock implementation from 32 to 63 bit
  [ARM] 3979/1: extend the SA11x0 sched_clock implementation from 32 to 63 bit period
  [ARM] 3978/1: macro to provide a 63-bit value from a 32-bit hardware counter
  ...

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
  */