diff options
| author | Anton Blanchard <anton@samba.org> | 2011-11-23 20:07:18 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-11-25 14:09:59 +1100 |
| commit | d8afc6fd95496204174f19af0cb39eefee0c3e8a (patch) | |
| tree | a970986afbf650df5a3879f3678959608c0086cd /arch/powerpc/kernel/time.c | |
| parent | 37fb9a0231ee43d42d069863bdfd567fca2b61af (diff) | |
powerpc/time: Use clockevents_calc_mult_shift
We can use clockevents_calc_mult_shift instead of doing all
the work ourselves.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 30 |
1 files changed, 2 insertions, 28 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 5db163c9675..fae3094c2a9 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -112,8 +112,6 @@ static void decrementer_set_mode(enum clock_event_mode mode, static struct clock_event_device decrementer_clockevent = { .name = "decrementer", .rating = 200, - .shift = 0, /* To be filled in */ - .mult = 0, /* To be filled in */ .irq = 0, .set_next_event = decrementer_set_next_event, .set_mode = decrementer_set_mode, @@ -913,31 +911,6 @@ static void decrementer_set_mode(enum clock_event_mode mode, decrementer_set_next_event(DECREMENTER_MAX, dev); } -static inline uint64_t div_sc64(unsigned long ticks, unsigned long nsec, - int shift) -{ - uint64_t tmp = ((uint64_t)ticks) << shift; - - do_div(tmp, nsec); - return tmp; -} - -static void __init setup_clockevent_multiplier(unsigned long hz) -{ - u64 mult, shift = 32; - - while (1) { - mult = div_sc64(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; @@ -955,7 +928,8 @@ static void __init init_decrementer_clockevent(void) { int cpu = smp_processor_id(); - setup_clockevent_multiplier(ppc_tb_freq); + clockevents_calc_mult_shift(&decrementer_clockevent, ppc_tb_freq, 4); + decrementer_clockevent.max_delta_ns = clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent); decrementer_clockevent.min_delta_ns = |