From 28bb7bc61a8cd48716d38d9c153fdc524f09870a Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 15 Dec 2010 21:46:48 +0000 Subject: ARM: mmp: convert sched_clock() to use new infrastructure Convert mmp to use the new sched_clock() infrastructure for extending 32bit counters to full 64-bit nanoseconds. Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + arch/arm/mach-mmp/time.c | 32 +++++++++++--------------------- 2 files changed, 12 insertions(+), 21 deletions(-) (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 6f58bce687f..0208e1e9ed7 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -513,6 +513,7 @@ config ARCH_MMP select ARCH_REQUIRE_GPIOLIB select COMMON_CLKDEV select GENERIC_CLOCKEVENTS + select HAVE_SCHED_CLOCK select TICK_ONESHOT select PLAT_PXA select SPARSE_IRQ diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c index a2ea33d04e6..aeb9ae23e6c 100644 --- a/arch/arm/mach-mmp/time.c +++ b/arch/arm/mach-mmp/time.c @@ -26,8 +26,8 @@ #include #include #include -#include +#include #include #include #include @@ -42,23 +42,7 @@ #define MAX_DELTA (0xfffffffe) #define MIN_DELTA (16) -#define TCR2NS_SCALE_FACTOR 10 - -static unsigned long tcr2ns_scale; - -static void __init set_tcr2ns_scale(unsigned long tcr_rate) -{ - unsigned long long v = 1000000000ULL << TCR2NS_SCALE_FACTOR; - do_div(v, tcr_rate); - tcr2ns_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 (tcr2ns_scale & 1) - tcr2ns_scale++; -} +static DEFINE_CLOCK_DATA(cd); /* * FIXME: the timer needs some delay to stablize the counter capture @@ -77,8 +61,14 @@ static inline uint32_t timer_read(void) unsigned long long notrace sched_clock(void) { - unsigned long long v = cnt32_to_63(timer_read()); - return (v * tcr2ns_scale) >> TCR2NS_SCALE_FACTOR; + u32 cyc = timer_read(); + return cyc_to_sched_clock(&cd, cyc, (u32)~0); +} + +static void notrace mmp_update_sched_clock(void) +{ + u32 cyc = timer_read(); + update_sched_clock(&cd, cyc, (u32)~0); } static irqreturn_t timer_interrupt(int irq, void *dev_id) @@ -185,7 +175,7 @@ void __init timer_init(int irq) { timer_config(); - set_tcr2ns_scale(CLOCK_TICK_RATE); + init_sched_clock(&cd, mmp_update_sched_clock, 32, CLOCK_TICK_RATE); ckevt.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt.shift); ckevt.max_delta_ns = clockevent_delta2ns(MAX_DELTA, &ckevt); -- cgit v1.2.3-18-g5258