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unified: Add tickless idle support for x86 and ARM
Change-Id: I42d20355321f431900727768a0836ee18e96b667 Signed-off-by: Peter Mitsis <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,139 @@ | ||
| #include "../nanokernel/idle.c" | ||
| /* | ||
| * Copyright (c) 2016 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. | ||
| */ | ||
|
|
||
| #include <nanokernel.h> | ||
| #include <nano_private.h> | ||
| #include <toolchain.h> | ||
| #include <sections.h> | ||
| #include <drivers/system_timer.h> | ||
| #include <wait_q.h> | ||
|
|
||
| #if defined(CONFIG_TICKLESS_IDLE) | ||
| /* | ||
| * Idle time must be this value or higher for timer to go into tickless idle | ||
| * state. | ||
| */ | ||
| int32_t _sys_idle_threshold_ticks = CONFIG_TICKLESS_IDLE_THRESH; | ||
| #endif /* CONFIG_TICKLESS_IDLE */ | ||
|
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||
| #ifdef CONFIG_SYS_POWER_MANAGEMENT | ||
| /** | ||
| * | ||
| * @brief Indicate that kernel is idling in tickless mode | ||
| * | ||
| * Sets the nanokernel data structure idle field to either a positive value or | ||
| * K_FOREVER. | ||
| * | ||
| * @param ticks the number of ticks to idle | ||
| * | ||
| * @return N/A | ||
| */ | ||
| static void set_kernel_idle_time_in_ticks(int32_t ticks) | ||
| { | ||
| _nanokernel.idle = ticks; | ||
| } | ||
| #else | ||
| #define set_kernel_idle_time_in_ticks(x) do { } while (0) | ||
| #endif | ||
|
|
||
| static void _sys_power_save_idle(int32_t ticks __unused) | ||
| { | ||
| #if defined(CONFIG_TICKLESS_IDLE) | ||
| if ((ticks == K_FOREVER) || ticks >= _sys_idle_threshold_ticks) { | ||
| /* | ||
| * Stop generating system timer interrupts until it's time for | ||
| * the next scheduled kernel timer to expire. | ||
| */ | ||
|
|
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| _timer_idle_enter(ticks); | ||
| } | ||
| #endif /* CONFIG_TICKLESS_IDLE */ | ||
|
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| set_kernel_idle_time_in_ticks(ticks); | ||
| #if (defined(CONFIG_SYS_POWER_LOW_POWER_STATE) || \ | ||
| defined(CONFIG_SYS_POWER_DEEP_SLEEP) || \ | ||
| defined(CONFIG_DEVICE_POWER_MANAGEMENT)) | ||
| /* | ||
| * Call the suspend hook function, which checks if the system should | ||
| * enter deep sleep, low power state or only suspend devices. | ||
| * If the time available is too short for any PM operation then | ||
| * the function returns SYS_PM_NOT_HANDLED immediately and kernel | ||
| * does normal idle processing. Otherwise it will return the code | ||
| * corresponding to the action taken. | ||
| * | ||
| * This function can just suspend devices without entering | ||
| * deep sleep or cpu low power state. In this case it should return | ||
| * SYS_PM_DEVICE_SUSPEND_ONLY and kernel would do normal idle | ||
| * processing. | ||
| * | ||
| * This function is entered with interrupts disabled. If the function | ||
| * returns either SYS_PM_LOW_POWER_STATE or SYS_PM_DEEP_SLEEP then | ||
| * it should ensure interrupts are re-enabled before returning. | ||
| * This is because the kernel does not do its own idle processing in | ||
| * these cases i.e. skips nano_cpu_idle(). The kernel's idle | ||
| * processing re-enables interrupts which is essential for kernel's | ||
| * scheduling logic. | ||
| */ | ||
| if (!(_sys_soc_suspend(ticks) & | ||
| (SYS_PM_DEEP_SLEEP | SYS_PM_LOW_POWER_STATE))) { | ||
| nano_cpu_idle(); | ||
| } | ||
| #else | ||
| nano_cpu_idle(); | ||
| #endif | ||
| } | ||
|
|
||
| void _sys_power_save_idle_exit(int32_t ticks) | ||
| { | ||
| #if (defined(CONFIG_SYS_POWER_LOW_POWER_STATE) || \ | ||
| defined(CONFIG_SYS_POWER_DEEP_SLEEP) || \ | ||
| defined(CONFIG_DEVICE_POWER_MANAGEMENT)) | ||
| /* | ||
| * Any idle wait based on CPU low power state will be exited by | ||
| * interrupt. This function is called within that interrupt's | ||
| * ISR context. _sys_soc_resume() needs to be called here | ||
| * to handle exit from CPU low power states. This gives an | ||
| * opportunity for device states altered in _sys_soc_suspend() | ||
| * to be restored before the kernel schedules another thread. | ||
| * _sys_soc_resume() is not called from here for deep sleep | ||
| * exit. Deep sleep recovery happens at cold boot path. | ||
| */ | ||
| _sys_soc_resume(); | ||
| #endif | ||
| #ifdef CONFIG_TICKLESS_IDLE | ||
| if ((ticks == K_FOREVER) || ticks >= _sys_idle_threshold_ticks) { | ||
| /* Resume normal periodic system timer interrupts */ | ||
|
|
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| _timer_idle_exit(); | ||
| } | ||
| #else | ||
| ARG_UNUSED(ticks); | ||
| #endif /* CONFIG_TICKLESS_IDLE */ | ||
| } | ||
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|
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| void idle(void *unused1, void *unused2, void *unused3) | ||
| { | ||
| ARG_UNUSED(unused1); | ||
| ARG_UNUSED(unused2); | ||
| ARG_UNUSED(unused3); | ||
|
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| for (;;) { | ||
| _sys_power_save_idle(_timeout_get_next_expiry()); | ||
|
|
||
| k_yield(); | ||
| } | ||
| } |
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