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Blackfin: use common code for cycle->nanosecond conversion

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No point in redefining things that common code already does for us.  Also
use CYC2NS_SCALE_FACTOR to better reflect reality and for better precision.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Yi Li 2009-09-15 08:55:47 +00:00 committed by Mike Frysinger
parent ceb33be95a
commit 298571249a
1 changed files with 4 additions and 22 deletions
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26
arch/blackfin/kernel/time-ts.c
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@ -46,20 +46,8 @@
#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
static inline unsigned long cyc2ns_scale(unsigned long cpu_khz)
{
return (1000000 << CYC2NS_SCALE_FACTOR) / cpu_khz;
}
static inline unsigned long long cycles_2_ns(cycle_t cyc, unsigned long cyc2ns_scale)
{
return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
}
#if defined(CONFIG_CYCLES_CLOCKSOURCE)
static unsigned long cycles_cyc2ns_scale;
static notrace cycle_t bfin_read_cycles(struct clocksource *cs)
{
return __bfin_cycles_off + (get_cycles() << __bfin_cycles_mod);
@ -70,19 +58,17 @@ static struct clocksource bfin_cs_cycles = {
.rating = 400,
.read = bfin_read_cycles,
.mask = CLOCKSOURCE_MASK(64),
.shift = 22,
.shift = CYC2NS_SCALE_FACTOR,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static inline unsigned long long bfin_cs_cycles_sched_clock(void)
{
return cycles_2_ns(bfin_read_cycles(&bfin_cs_cycles), cycles_cyc2ns_scale);
return cyc2ns(&bfin_cs_cycles, bfin_read_cycles(&bfin_cs_cycles));
}
static int __init bfin_cs_cycles_init(void)
{
cycles_cyc2ns_scale = cyc2ns_scale(get_cclk() / 1000);
bfin_cs_cycles.mult = \
clocksource_hz2mult(get_cclk(), bfin_cs_cycles.shift);
@ -97,8 +83,6 @@ static int __init bfin_cs_cycles_init(void)
#ifdef CONFIG_GPTMR0_CLOCKSOURCE
unsigned long gptimer0_cyc2ns_scale;
void __init setup_gptimer0(void)
{
disable_gptimers(TIMER0bit);
@ -121,19 +105,17 @@ static struct clocksource bfin_cs_gptimer0 = {
.rating = 350,
.read = bfin_read_gptimer0,
.mask = CLOCKSOURCE_MASK(32),
.shift = 22,
.shift = CYC2NS_SCALE_FACTOR,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static inline unsigned long long bfin_cs_gptimer0_sched_clock(void)
{
return cycles_2_ns(bfin_read_TIMER0_COUNTER(), gptimer0_cyc2ns_scale);
return cyc2ns(&bfin_cs_gptimer0, bfin_read_TIMER0_COUNTER());
}
static int __init bfin_cs_gptimer0_init(void)
{
gptimer0_cyc2ns_scale = cyc2ns_scale(get_sclk() / 1000);
setup_gptimer0();
bfin_cs_gptimer0.mult = \