diff options
author | Kevin Hilman <khilman@mvista.com> | 2007-12-13 02:25:56 (GMT) |
---|---|---|
committer | Tony Lindgren <tony@atomide.com> | 2008-04-14 16:57:13 (GMT) |
commit | caa97963a5d9042af15728bcd22ee5a8900dc0e9 (patch) | |
tree | 785315c0b087b15525488f999089d5d234ae884f /arch/arm/mach-omap1/time.c | |
parent | 5c8388e5dfa7bddfca68f16b0ef61933508b716b (diff) | |
download | linux-caa97963a5d9042af15728bcd22ee5a8900dc0e9.tar.xz |
ARM: OMAP: TimerMPU: Remove unused cycles-to-nsec conversions
These are no longer used and similar conversions are provided
by the clocksource/clockevent code.
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap1/time.c')
-rw-r--r-- | arch/arm/mach-omap1/time.c | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c index a4f8b20..f6cf2b7 100644 --- a/arch/arm/mach-omap1/time.c +++ b/arch/arm/mach-omap1/time.c @@ -56,37 +56,6 @@ #define OMAP_MPU_TIMER_BASE OMAP_MPU_TIMER1_BASE #define OMAP_MPU_TIMER_OFFSET 0x100 -/* cycles to nsec conversions taken from arch/i386/kernel/timers/timer_tsc.c, - * converted to use kHz by Kevin Hilman */ -/* convert from cycles(64bits) => nanoseconds (64bits) - * basic equation: - * ns = cycles / (freq / ns_per_sec) - * ns = cycles * (ns_per_sec / freq) - * ns = cycles * (10^9 / (cpu_khz * 10^3)) - * ns = cycles * (10^6 / cpu_khz) - * - * Then we use scaling math (suggested by george at mvista.com) to get: - * ns = cycles * (10^6 * SC / cpu_khz / SC - * ns = cycles * cyc2ns_scale / SC - * - * And since SC is a constant power of two, we can convert the div - * into a shift. - * -johnstul at us.ibm.com "math is hard, lets go shopping!" - */ -static unsigned long cyc2ns_scale; -#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ - -static inline void set_cyc2ns_scale(unsigned long cpu_khz) -{ - cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz; -} - -static inline unsigned long long cycles_2_ns(unsigned long long cyc) -{ - return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR; -} - - typedef struct { u32 cntl; /* CNTL_TIMER, R/W */ u32 load_tim; /* LOAD_TIM, W */ @@ -194,8 +163,6 @@ static struct irqaction omap_mpu_timer1_irq = { static __init void omap_init_mpu_timer(unsigned long rate) { - set_cyc2ns_scale(rate / 1000); - setup_irq(INT_TIMER1, &omap_mpu_timer1_irq); omap_mpu_timer_start(0, (rate / HZ) - 1, 1); |