diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-15 21:48:15 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-22 22:44:45 +0000 |
| commit | 7ce830188199c23aaeaf0c5ccc28b73c32b6df02 (patch) | |
| tree | b34f40b20e0b5ce92c1c792b6fffe90efff32b0a /arch/arm/mach-pxa/time.c | |
| parent | 28bb7bc61a8cd48716d38d9c153fdc524f09870a (diff) | |
ARM: pxa: convert sched_clock() to use new infrastructure
Convert pxa to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.
Tested-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa/time.c')
| -rw-r--r-- | arch/arm/mach-pxa/time.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c index b8d9dff00ad..e7f64d9b4f2 100644 --- a/arch/arm/mach-pxa/time.c +++ b/arch/arm/mach-pxa/time.c @@ -17,11 +17,11 @@ #include <linux/interrupt.h> #include <linux/clockchips.h> #include <linux/sched.h> -#include <linux/cnt32_to_63.h> #include <asm/div64.h> #include <asm/mach/irq.h> #include <asm/mach/time.h> +#include <asm/sched_clock.h> #include <mach/regs-ost.h> /* @@ -32,29 +32,18 @@ * long as there is always less than 582 seconds between successive * calls to sched_clock() which should always be the case in practice. */ +static DEFINE_CLOCK_DATA(cd); -#define OSCR2NS_SCALE_FACTOR 10 - -static unsigned long oscr2ns_scale; - -static void __init set_oscr2ns_scale(unsigned long oscr_rate) +unsigned long long notrace sched_clock(void) { - 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++; + u32 cyc = OSCR; + return cyc_to_sched_clock(&cd, cyc, (u32)~0); } -unsigned long long notrace sched_clock(void) +static void notrace pxa_update_sched_clock(void) { - unsigned long long v = cnt32_to_63(OSCR); - return (v * oscr2ns_scale) >> OSCR2NS_SCALE_FACTOR; + u32 cyc = OSCR; + update_sched_clock(&cd, cyc, (u32)~0); } @@ -144,7 +133,7 @@ static void __init pxa_timer_init(void) OIER = 0; OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3; - set_oscr2ns_scale(clock_tick_rate); + init_sched_clock(&cd, pxa_update_sched_clock, 32, clock_tick_rate); ckevt_pxa_osmr0.mult = div_sc(clock_tick_rate, NSEC_PER_SEC, ckevt_pxa_osmr0.shift); |