*/
#include <linux/errno.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
.rating = 400,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.mask = CLOCKSOURCE_MASK(64),
- .shift = 22,
- .mult = 0, /* To be filled in */
.read = rtc_read,
};
.rating = 400,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.mask = CLOCKSOURCE_MASK(64),
- .shift = 22,
- .mult = 0, /* To be filled in */
.read = timebase_read,
};
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,
struct pt_regs *old_regs;
struct decrementer_clock *decrementer = &__get_cpu_var(decrementers);
struct clock_event_device *evt = &decrementer->event;
- u64 now;
/* Ensure a positive value is written to the decrementer, or else
* some CPUs will continue to take decrementer exceptions.
get_lppaca()->int_dword.fields.decr_int = 0;
#endif
- now = get_tb_or_rtc();
- if (now >= decrementer->next_tb) {
- decrementer->next_tb = ~(u64)0;
- if (evt->event_handler)
- evt->event_handler(evt);
- } else {
- now = decrementer->next_tb - now;
- if (now <= DECREMENTER_MAX)
- set_dec((int)now);
- }
+ decrementer->next_tb = ~(u64)0;
+ if (evt->event_handler)
+ evt->event_handler(evt);
#ifdef CONFIG_PPC_ISERIES
if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending())
++vdso_data->tb_update_count;
smp_mb();
- /* XXX this assumes clock->shift == 22 */
- /* 4611686018 ~= 2^(20+64-22) / 1e9 */
- new_tb_to_xs = (u64) mult * 4611686018ULL;
+ /* 19342813113834067 ~= 2^(20+64) / 1e9 */
+ new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift);
new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
do_div(new_stamp_xsec, 1000000000);
new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
else
clock = &clocksource_timebase;
- clock->mult = clocksource_hz2mult(tb_ticks_per_sec, clock->shift);
-
- if (clocksource_register(clock)) {
+ if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
printk(KERN_ERR "clocksource: %s is already registered\n",
clock->name);
return;
clock->name, clock->mult, clock->shift);
}
+void decrementer_check_overflow(void)
+{
+ u64 now = get_tb_or_rtc();
+ struct decrementer_clock *decrementer = &__get_cpu_var(decrementers);
+
+ if (now >= decrementer->next_tb)
+ set_dec(1);
+}
+
static int decrementer_set_next_event(unsigned long evt,
struct clock_event_device *dev)
{
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;
{
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 =