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4935a885ee
Rather than open code this each time, create a function for this. The wrap-around condition may not be needed, if the timer starts at zero, since we have 64 bits to play with. BUG=chrome-os-partner:9424 TEST=build and boot on daisy Change-Id: I84ae651212769b5927c452bc03f31f60a25a829e Signed-off-by: Simon Glass <sjg@chromium.org>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Timer module for Chrome EC operating system */
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#ifndef __CROS_EC_TIMER_H
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#define __CROS_EC_TIMER_H
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#include "common.h"
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#include "task_id.h"
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/* Microsecond timestamp. */
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typedef union {
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uint64_t val;
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struct {
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uint32_t lo;
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uint32_t hi;
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} le /* little endian words */;
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} timestamp_t;
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/* Initializes the Timer module. */
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int timer_init(void);
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/* Launch a one-shot timer for task <tskid> which expires at timestamp
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* <tstamp>. */
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int timer_arm(timestamp_t tstamp, task_id_t tskid);
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/* Cancel a running timer for the specified task id. */
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int timer_cancel(task_id_t tskid);
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/**
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* Check if a timestamp has passed / expired
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*
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* @param deadline deadline timer value to check
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* @return 0 if deadline has not yet passed, 1 if it has passed
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*/
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int timestamp_expired(timestamp_t deadline);
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/* Busy-wait the selected number of microseconds. Note that calling this
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* with us>1000 may impact system performance; use usleep for longer delays. */
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void udelay(unsigned us);
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/* Sleep during the selected number of microseconds. The current task will be
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* de-scheduled until the delay expires.
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*
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* Note: if an event happens before the end of sleep, the function will return.
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*/
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void usleep(unsigned us);
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/* Get the current timestamp from the system timer. */
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timestamp_t get_time(void);
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/* Print the current timer information using the command output channel. This
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* may be called from interrupt level. */
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void timer_print_info(void);
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#endif /* __CROS_EC_TIMER_H */
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