| /* |
| * Copyright (c) 2011-2014 Wind River Systems, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * @brief Nanokernel idle support |
| * |
| * This module provides routines to set the idle field in the nanokernel |
| * data structure. |
| */ |
| |
| |
| #include <nanokernel.h> |
| #include <nano_private.h> |
| #include <toolchain.h> |
| #include <sections.h> |
| #include <drivers/system_timer.h> |
| #include <wait_q.h> |
| |
| /** |
| * |
| * @brief Indicate that nanokernel is idling in tickless mode |
| * |
| * Sets the nanokernel data structure idle field to a non-zero value. |
| * |
| * @param ticks the number of ticks to idle |
| * |
| * @return N/A |
| */ |
| void nano_cpu_set_idle(int32_t ticks) |
| { |
| extern tNANO _nanokernel; |
| |
| _nanokernel.idle = ticks; |
| } |
| |
| #if defined(CONFIG_NANOKERNEL) && defined(CONFIG_TICKLESS_IDLE) |
| |
| int32_t _sys_idle_ticks_threshold = CONFIG_TICKLESS_IDLE_THRESH; |
| |
| #if defined(CONFIG_NANO_TIMEOUTS) || defined(CONFIG_NANO_TIMERS) |
| static inline int32_t get_next_tick_expiry(void) |
| { |
| return _nano_get_earliest_timeouts_deadline(); |
| } |
| #else |
| #define get_next_tick_expiry(void) TICKS_UNLIMITED |
| #endif |
| |
| static inline int was_in_tickless_idle(void) |
| { |
| return (_nanokernel.idle == TICKS_UNLIMITED) || |
| (_nanokernel.idle >= _sys_idle_ticks_threshold); |
| } |
| |
| static inline int must_enter_tickless_idle(void) |
| { |
| /* uses same logic as was_in_tickless_idle() */ |
| return was_in_tickless_idle(); |
| } |
| |
| void _power_save_idle(void) |
| { |
| _nanokernel.idle = get_next_tick_expiry(); |
| |
| if (must_enter_tickless_idle()) { |
| _timer_idle_enter((uint32_t)_nanokernel.idle); |
| } |
| } |
| |
| void _power_save_idle_exit(void) |
| { |
| if (was_in_tickless_idle()) { |
| _timer_idle_exit(); |
| _nanokernel.idle = 0; |
| } |
| } |
| |
| #endif /* CONFIG_NANOKERNEL && CONFIG_TICKLESS_IDLE */ |