52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
|
|
* This file is part of the coreboot project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <delay.h>
|
|
#include <timer.h>
|
|
|
|
#include "dmtimer.h"
|
|
|
|
static struct monotonic_counter {
|
|
int initialized;
|
|
struct mono_time time;
|
|
uint64_t last_value;
|
|
} mono_counter;
|
|
|
|
static const uint32_t clocks_per_usec = OSC_HZ/1000000;
|
|
|
|
void timer_monotonic_get(struct mono_time *mt)
|
|
{
|
|
uint64_t current_tick;
|
|
uint64_t usecs_elapsed;
|
|
|
|
if (!mono_counter.initialized) {
|
|
init_timer();
|
|
mono_counter.last_value = dmtimer_raw_value(0);
|
|
mono_counter.initialized = 1;
|
|
}
|
|
|
|
current_tick = dmtimer_raw_value(0);
|
|
usecs_elapsed = (current_tick - mono_counter.last_value) /
|
|
clocks_per_usec;
|
|
|
|
/* Update current time and tick values only if a full tick occurred. */
|
|
if (usecs_elapsed) {
|
|
mono_time_add_usecs(&mono_counter.time, usecs_elapsed);
|
|
mono_counter.last_value = current_tick;
|
|
}
|
|
|
|
/* Save result. */
|
|
*mt = mono_counter.time;
|
|
}
|