96cb05ca50
Change-Id: I42d20355321f431900727768a0836ee18e96b667 Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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* Copyright (c) 2015 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Timer driver API
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*
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*
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* Declare API implemented by system timer driver and used by kernel components.
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*/
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#ifndef _TIMER__H_
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#define _TIMER__H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef _ASMLANGUAGE
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GTEXT(_timer_int_handler)
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#else /* _ASMLANGUAGE */
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#include <device.h>
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extern int _sys_clock_driver_init(struct device *device);
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/*
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* Timer interrupt handler is one of the routines that the driver
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* has to implement, but it is not necessarily an external function.
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* The driver may implement it and use only when setting an
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* interrupt handler by calling irq_connect.
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*/
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extern void _timer_int_handler(void *arg);
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#ifdef CONFIG_SYSTEM_CLOCK_DISABLE
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extern void sys_clock_disable(void);
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#endif
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#ifdef CONFIG_TICKLESS_IDLE
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extern void _timer_idle_enter(int32_t ticks);
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extern void _timer_idle_exit(void);
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#endif /* CONFIG_TICKLESS_IDLE */
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#ifndef CONFIG_KERNEL_V2
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extern uint32_t _nano_get_earliest_deadline(void);
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#endif /* CONFIG_KERNEL_V2 */
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extern void _nano_sys_clock_tick_announce(int32_t ticks);
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extern int sys_clock_device_ctrl(struct device *device,
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uint32_t ctrl_command, void *context);
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/*
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* Currently regarding timers, only loapic timer implements
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* device pm functionality. For other timers, use default handler in case
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* the app enables CONFIG_DEVICE_POWER_MANAGEMENT.
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*/
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#ifndef CONFIG_LOAPIC_TIMER
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#define sys_clock_device_ctrl device_control_nop
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#endif
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extern int32_t _sys_idle_elapsed_ticks;
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#if !defined(CONFIG_KERNEL_V2) && defined(CONFIG_MICROKERNEL)
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extern void (*_do_sys_clock_tick_announce)(kevent_t);
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#define _sys_clock_tick_announce() _do_sys_clock_tick_announce(TICK_EVENT)
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/**
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* @brief Account for the tick due to the timer interrupt
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*
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* @return N/A
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*/
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static inline void _sys_clock_final_tick_announce(void)
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{
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/*
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* Ticks are annnounced at interrupt level but processed later in
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* the kernel server fiber. Increment '_sys_idle_elapsed_ticks' as
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* some ticks may have previously been announced by _timer_idle_exit()
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* (if tickless idle is enabled) but not yet processed.
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*/
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_sys_idle_elapsed_ticks++;
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/* If no ticks were previously announced, announce the tick now. */
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if (_sys_idle_elapsed_ticks == 1) {
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_sys_clock_tick_announce();
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}
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}
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#else
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#define _sys_clock_tick_announce() \
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_nano_sys_clock_tick_announce(_sys_idle_elapsed_ticks)
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/**
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* @brief Account for the tick due to the timer interrupt
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*
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* @return N/A
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*/
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static inline void _sys_clock_final_tick_announce(void)
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{
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/*
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* Ticks are both announced and immediately processed at interrupt
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* level. Thus there is only one tick left to announce (and process).
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*/
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_sys_idle_elapsed_ticks = 1;
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_sys_clock_tick_announce();
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}
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#endif
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#endif /* _ASMLANGUAGE */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _TIMER__H_ */
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