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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-15 21:46:48 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-22 22:44:45 +0000 |
| commit | 28bb7bc61a8cd48716d38d9c153fdc524f09870a (patch) | |
| tree | 0ac6969dffbe5def2400fc18321789206711465a /arch/arm/mach-mmp/time.c | |
| parent | 5b0d495c067d843c52fc1f9edbca29d5e9368b10 (diff) | |
| download | linux-28bb7bc61a8cd48716d38d9c153fdc524f09870a.tar.bz2 | |
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 <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-mmp/time.c')
| -rw-r--r-- | arch/arm/mach-mmp/time.c | 32 |
1 files changed, 11 insertions, 21 deletions
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c index a2ea33d04e63..aeb9ae23e6ce 100644 --- a/arch/arm/mach-mmp/time.c +++ b/arch/arm/mach-mmp/time.c @@ -26,8 +26,8 @@ #include <linux/io.h> #include <linux/irq.h> #include <linux/sched.h> -#include <linux/cnt32_to_63.h> +#include <asm/sched_clock.h> #include <mach/addr-map.h> #include <mach/regs-timers.h> #include <mach/regs-apbc.h> @@ -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); |