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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-12-15 21:23:13 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-12-22 22:44:44 +0000
commit5b0d495c067d843c52fc1f9edbca29d5e9368b10 (patch)
tree5af99e500e83ee8aa9946fe197db45784ec7df64
parent112f38a4a31668eb6a7d91d128296a26afdf7c4b (diff)
ARM: ixp4xx: convert sched_clock() to use new infrastructure
Convert ixp4xx to use the new sched_clock() infrastructure for extending 32bit counters to full 64-bit nanoseconds. Tested-by: Mikael Pettersson <mikpe@it.uu.se> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-ixp4xx/common.c31
2 files changed, 21 insertions, 11 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ed7a0a729d9..6f58bce687f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -437,6 +437,7 @@ config ARCH_IXP4XX
select CPU_XSCALE
select GENERIC_GPIO
select GENERIC_CLOCKEVENTS
+ select HAVE_SCHED_CLOCK
select DMABOUNCE if PCI
help
Support for Intel's IXP4XX (XScale) family of processors.
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index e0b91d8ef64..4dbfcbb9163 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -35,6 +35,7 @@
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
+#include <asm/sched_clock.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
@@ -399,6 +400,23 @@ void __init ixp4xx_sys_init(void)
}
/*
+ * sched_clock()
+ */
+static DEFINE_CLOCK_DATA(cd);
+
+unsigned long long notrace sched_clock(void)
+{
+ u32 cyc = *IXP4XX_OSTS;
+ return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+}
+
+static void notrace ixp4xx_update_sched_clock(void)
+{
+ u32 cyc = *IXP4XX_OSTS;
+ update_sched_clock(&cd, cyc, (u32)~0);
+}
+
+/*
* clocksource
*/
static cycle_t ixp4xx_get_cycles(struct clocksource *cs)
@@ -418,18 +436,9 @@ unsigned long ixp4xx_timer_freq = FREQ;
EXPORT_SYMBOL(ixp4xx_timer_freq);
static void __init ixp4xx_clocksource_init(void)
{
- clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq);
-}
-
-/*
- * sched_clock()
- */
-unsigned long long notrace sched_clock(void)
-{
- cycle_t cyc = ixp4xx_get_cycles(NULL);
- struct clocksource *cs = &clocksource_ixp4xx;
+ init_sched_clock(&cd, ixp4xx_update_sched_clock, 32, ixp4xx_timer_freq);
- return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+ clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq);
}
/*