mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-12-28 02:35:28 +00:00
6d04819930
It is useful to implement timeouts like this: start = get_time(); while (time_since32(start) < 1000) ... Add a function to make this easy. Note that for efficiency we only support a 32-bit return value which limits the timeouts to about an hour. BUG=chrome-os-partner:10888 TEST=manual: build for all boards boot on snow Change-Id: I200cb04f5a76b4c76a9bc314d927e4bab1f08a56 Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/26289 Reviewed-by: Randall Spangler <rspangler@chromium.org>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
/* Timer module for Chrome EC operating system */
|
|
|
|
#ifndef __CROS_EC_TIMER_H
|
|
#define __CROS_EC_TIMER_H
|
|
|
|
#include "common.h"
|
|
#include "task_id.h"
|
|
|
|
/* Microsecond timestamp. */
|
|
typedef union {
|
|
uint64_t val;
|
|
struct {
|
|
uint32_t lo;
|
|
uint32_t hi;
|
|
} le /* little endian words */;
|
|
} timestamp_t;
|
|
|
|
/* Initializes the Timer module. */
|
|
int timer_init(void);
|
|
|
|
/* Launch a one-shot timer for task <tskid> which expires at timestamp
|
|
* <tstamp>. */
|
|
int timer_arm(timestamp_t tstamp, task_id_t tskid);
|
|
|
|
/* Cancel a running timer for the specified task id. */
|
|
int timer_cancel(task_id_t tskid);
|
|
|
|
/**
|
|
* Check if a timestamp has passed / expired
|
|
*
|
|
* @param deadline deadline timer value to check
|
|
* @param now pointer to value of time_now() if known, else NULL
|
|
* @return 0 if deadline has not yet passed, 1 if it has passed
|
|
*/
|
|
int timestamp_expired(timestamp_t deadline, const timestamp_t *now);
|
|
|
|
/* Busy-wait the selected number of microseconds. Note that calling this
|
|
* with us>1000 may impact system performance; use usleep for longer delays. */
|
|
void udelay(unsigned us);
|
|
|
|
/* Sleep during the selected number of microseconds. The current task will be
|
|
* de-scheduled until the delay expires.
|
|
*
|
|
* Note: if an event happens before the end of sleep, the function will return.
|
|
*/
|
|
void usleep(unsigned us);
|
|
|
|
/* Get the current timestamp from the system timer. */
|
|
timestamp_t get_time(void);
|
|
|
|
/* Print the current timer information using the command output channel. This
|
|
* may be called from interrupt level. */
|
|
void timer_print_info(void);
|
|
|
|
/**
|
|
* Returns the number of microseconds that have elapsed from a start time.
|
|
*
|
|
* This function is for timing short delays typically of a few milliseconds
|
|
* or so.
|
|
*
|
|
* Note that this is limited to a maximum of 32 bits, which is around an
|
|
* hour. After that, the value returned will wrap.
|
|
*
|
|
* @param start Start time to compare against
|
|
* @return number of microseconds that have elspsed since that start time
|
|
*/
|
|
static inline unsigned time_since32(timestamp_t start)
|
|
{
|
|
return get_time().le.lo - start.le.lo;
|
|
}
|
|
|
|
#endif /* __CROS_EC_TIMER_H */
|