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@@ -109,7 +109,7 @@ static void decrementer_set_mode(enum clock_event_mode mode,
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static struct clock_event_device decrementer_clockevent = {
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.name = "decrementer",
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.rating = 200,
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- .shift = 16,
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+ .shift = 0, /* To be filled in */
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.mult = 0, /* To be filled in */
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.irq = 0,
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.set_next_event = decrementer_set_next_event,
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@@ -843,6 +843,22 @@ static void decrementer_set_mode(enum clock_event_mode mode,
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decrementer_set_next_event(DECREMENTER_MAX, dev);
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}
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+static void __init setup_clockevent_multiplier(unsigned long hz)
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+{
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+ u64 mult, shift = 32;
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+
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+ while (1) {
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+ mult = div_sc(hz, NSEC_PER_SEC, shift);
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+ if (mult && (mult >> 32UL) == 0UL)
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+ break;
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+
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+ shift--;
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+ }
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+
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+ decrementer_clockevent.shift = shift;
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+ decrementer_clockevent.mult = mult;
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+}
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+
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static void register_decrementer_clockevent(int cpu)
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{
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struct clock_event_device *dec = &per_cpu(decrementers, cpu).event;
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@@ -860,8 +876,7 @@ static void __init init_decrementer_clockevent(void)
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{
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int cpu = smp_processor_id();
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- decrementer_clockevent.mult = div_sc(ppc_tb_freq, NSEC_PER_SEC,
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- decrementer_clockevent.shift);
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+ setup_clockevent_multiplier(ppc_tb_freq);
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decrementer_clockevent.max_delta_ns =
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clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent);
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decrementer_clockevent.min_delta_ns =
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