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authorNicolas Pitre <nico@cam.org>2007-08-17 16:55:22 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-10-12 21:14:35 +0100
commit6c3a158316598bfb165b8c83b168fa413d5ae2d8 (patch)
tree25850d9461a4a3ed5bf1833a54bcde00be8af280 /arch/arm
parente86908614f2c7fec401827e5cefd7a6ea9407f85 (diff)
[ARM] 4550/1: sched_clock on PXA should cope with run time clock rate selection
The previous implementation was relying on compile time optimizations based on a constant clock rate. However, support for different PXA flavors in the same kernel binary requires that the clock be selected at run time, so here it is. Let's move this code to a more appropriate location while at it. Signed-off-by: Nicolas Pitre <npitre@mvista.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-pxa/generic.c62
-rw-r--r--arch/arm/mach-pxa/time.c39
2 files changed, 39 insertions, 62 deletions
diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 5510f6fdce5..9d6a2c00d76 100644
--- 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>
@@ -47,64 +43,6 @@
#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
*/
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
index 98d27e646b0..7916311547c 100644
--- a/arch/arm/mach-pxa/time.c
+++ b/arch/arm/mach-pxa/time.c
@@ -16,11 +16,48 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/clockchips.h>
+#include <linux/sched.h>
+#include <asm/div64.h>
+#include <asm/cnt32_to_63.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/arch/pxa-regs.h>
+/*
+ * This is PXA's sched_clock implementation. This has a resolution
+ * of at least 308 ns and a maximum value of 208 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 sched_clock() which should always be the case in practice.
+ */
+
+#define OSCR2NS_SCALE_FACTOR 10
+
+static unsigned long oscr2ns_scale;
+
+static void __init set_oscr2ns_scale(unsigned long oscr_rate)
+{
+ unsigned long long v = 1000000000ULL << OSCR2NS_SCALE_FACTOR;
+ do_div(v, oscr_rate);
+ oscr2ns_scale = v;
+ /*
+ * We want an even value to automatically clear the top bit
+ * returned by cnt32_to_63() without an additional run time
+ * instruction. So if the LSB is 1 then round it up.
+ */
+ if (oscr2ns_scale & 1)
+ oscr2ns_scale++;
+}
+
+unsigned long long sched_clock(void)
+{
+ unsigned long long v = cnt32_to_63(OSCR);
+ return (v * oscr2ns_scale) >> OSCR2NS_SCALE_FACTOR;
+}
+
+
static irqreturn_t
pxa_ost0_interrupt(int irq, void *dev_id)
{
@@ -152,6 +189,8 @@ static void __init pxa_timer_init(void)
OIER = 0;
OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
+ set_oscr2ns_scale(CLOCK_TICK_RATE);
+
ckevt_pxa_osmr0.mult =
div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt_pxa_osmr0.shift);
ckevt_pxa_osmr0.max_delta_ns =