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dbc861c5f0
When we wake up from a deep sleep mode, the system timer clock might have been stopped. We need to be able to set using another time source (e.g. the RTC). Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BUG=chrome-os-partner:8866 TEST=make BOARD=snow && make BOARD=link on Snow, on a software implementing STOP mode, check the system time is still accurate by comparing it to the wall clock. Change-Id: Ieddbb423d052c7aceb398470866b25b25a74c0a0 Reviewed-on: https://gerrit.chromium.org/gerrit/29314 Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org>
86 lines
2.5 KiB
C
86 lines
2.5 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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* @param now pointer to value of time_now() if known, else NULL
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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, const timestamp_t *now);
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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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/* Force the current value of the system timer.
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*
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* This function is for the power management implementation which wants to fix
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* the system time when waking up from a mode with clocks turned off.
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* Note: must be called with interrupts disabled.
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*/
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void force_time(timestamp_t ts);
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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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/**
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* Returns the number of microseconds that have elapsed from a start time.
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*
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* This function is for timing short delays typically of a few milliseconds
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* or so.
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*
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* Note that this is limited to a maximum of 32 bits, which is around an
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* hour. After that, the value returned will wrap.
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*
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* @param start Start time to compare against
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* @return number of microseconds that have elspsed since that start time
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*/
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static inline unsigned time_since32(timestamp_t start)
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{
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return get_time().le.lo - start.le.lo;
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}
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#endif /* __CROS_EC_TIMER_H */
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