101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/****************************************************************************
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* arch/arm/src/lc823450/lc823450_idle.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <nuttx/clock.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include "nvic.h"
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#include "arm_internal.h"
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#ifdef CONFIG_DVFS
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# include "lc823450_dvfs2.h"
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static uint32_t g_idle_counter[2];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_idle
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*
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* Description:
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* up_idle() is the logic that will be executed when there is no other
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* ready-to-run task. This is processor idle time and will continue until
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* some interrupt occurs to cause a context switch from the idle task.
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*
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* Processing in this state may be processor-specific. e.g., this is where
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* power management operations might be performed.
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*
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****************************************************************************/
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void up_idle(void)
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{
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#if defined(CONFIG_SUPPRESS_INTERRUPTS) || defined(CONFIG_SUPPRESS_TIMER_INTS)
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/* If the system is idle and there are no timer interrupts, then process
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* "fake" timer interrupts. Hopefully, something will wake up.
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*/
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nxsched_process_timer();
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#else
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/* DVFS and LED control must be done with local interrupts disabled */
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irqstate_t flags;
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flags = up_irq_save();
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#ifdef CONFIG_LC823450_SLEEP_MODE
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/* Clear SLEEPDEEP flag */
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uint32_t regval = getreg32(NVIC_SYSCON);
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regval &= ~NVIC_SYSCON_SLEEPDEEP;
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putreg32(regval, NVIC_SYSCON);
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#endif
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#ifdef CONFIG_DVFS
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lc823450_dvfs_enter_idle();
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#endif
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board_autoled_off(LED_CPU0 + up_cpu_index());
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up_irq_restore(flags);
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/* Sleep until an interrupt occurs to save power */
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asm("WFI");
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g_idle_counter[up_cpu_index()]++;
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#endif
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}
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