diff options
| author | Ingo Molnar <mingo@elte.hu> | 2009-06-17 08:59:01 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-17 08:59:10 +0200 |
| commit | cc4949e1fdade5d063e9f8783cf0e2cc92041ce5 (patch) | |
| tree | 4023bd641bfe464efbde518fb504d6865c9df014 /arch/powerpc/kernel/time.c | |
| parent | 28b4868820a56de661f54742ff91b78e12f1e582 (diff) | |
| parent | 300df7dc89cc276377fc020704e34875d5c473b6 (diff) | |
Merge branch 'linus' into x86/urgent
Merge reason: pull in latest to fix a bug in it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 48571ac56fb..15391c2ab01 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -52,6 +52,7 @@ #include <linux/jiffies.h> #include <linux/posix-timers.h> #include <linux/irq.h> +#include <linux/delay.h> #include <asm/io.h> #include <asm/processor.h> @@ -109,7 +110,7 @@ static void decrementer_set_mode(enum clock_event_mode mode, static struct clock_event_device decrementer_clockevent = { .name = "decrementer", .rating = 200, - .shift = 16, + .shift = 0, /* To be filled in */ .mult = 0, /* To be filled in */ .irq = 0, .set_next_event = decrementer_set_next_event, @@ -843,6 +844,22 @@ static void decrementer_set_mode(enum clock_event_mode mode, decrementer_set_next_event(DECREMENTER_MAX, dev); } +static void __init setup_clockevent_multiplier(unsigned long hz) +{ + u64 mult, shift = 32; + + while (1) { + mult = div_sc(hz, NSEC_PER_SEC, shift); + if (mult && (mult >> 32UL) == 0UL) + break; + + shift--; + } + + decrementer_clockevent.shift = shift; + decrementer_clockevent.mult = mult; +} + static void register_decrementer_clockevent(int cpu) { struct clock_event_device *dec = &per_cpu(decrementers, cpu).event; @@ -860,8 +877,7 @@ static void __init init_decrementer_clockevent(void) { int cpu = smp_processor_id(); - decrementer_clockevent.mult = div_sc(ppc_tb_freq, NSEC_PER_SEC, - decrementer_clockevent.shift); + setup_clockevent_multiplier(ppc_tb_freq); decrementer_clockevent.max_delta_ns = clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent); decrementer_clockevent.min_delta_ns = @@ -1128,6 +1144,15 @@ void div128_by_32(u64 dividend_high, u64 dividend_low, } +/* We don't need to calibrate delay, we use the CPU timebase for that */ +void calibrate_delay(void) +{ + /* Some generic code (such as spinlock debug) use loops_per_jiffy + * as the number of __delay(1) in a jiffy, so make it so + */ + loops_per_jiffy = tb_ticks_per_jiffy; +} + static int __init rtc_init(void) { struct platform_device *pdev; |