/*
* High res timers changes: First we want to use full nsec for all
* the math to avoid the double round off (on the offset and xtime).
* Second, we want to allow a boot with HRT turned off at boot time.
* This will cause hrtimer_use to be false, and we then fall back to
* the old code. We also shorten the xtime lock region and eliminate
* the lost tick code as this kernel will never have lost ticks under
* the lock (i.e. wall_jiffies will never differ from jiffies except
* when the write xtime lock is held).
*/
void do_gettimeofday(struct timeval *tv)
{
unsigned long seq;
unsigned long sec, nsec, clk_nsec;
unsigned long max_ntp_tick;
do {
seq = read_seqbegin(&xtime_lock);
#ifdef CONFIG_HIGH_RES_TIMERS
if (hrtimer_use)
nsec = arch_cycle_to_nsec(get_arch_cycles(wall_jiffies));
else
#endif
nsec = cur_timer->get_offset() * NSEC_PER_USEC;
sec = xtime.tv_sec;
clk_nsec = xtime.tv_nsec;
max_ntp_tick = current_tick_length() >> (SHIFT_SCALE - 10);
} while (read_seqretry(&xtime_lock, seq));
/* ensure we don't advance beyond the current tick length */
nsec = min(nsec, max_ntp_tick);
nsec += clk_nsec;
while (nsec >= NSEC_PER_SEC) {
nsec -= NSEC_PER_SEC;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = nsec / NSEC_PER_USEC;
}
/*!
* mxc_hrt_trace_elapsed() - return micro-seconds between two tick values
*
*/
u64 mxc_hrt_trace_elapsed(u64 *t1, u64 *t2)
{
u64 ticks = (*t1 > *t2) ? (*t1 - *t2) : (*t2 - *t1);
return (arch_cycle_to_nsec (ticks)/1000);
}
