441cfb82db
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5183 42af7a65-404d-4744-a932-0658087f49c3
212 lines
6.5 KiB
C
212 lines
6.5 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_idle.c
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <arch/board/board.h>
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <nuttx/power/pm.h>
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#include <arch/irq.h>
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#include "chip.h"
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#include "stm32_pm.h"
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#include "up_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Does the board support an IDLE LED to indicate that the board is in the
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* IDLE state?
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*/
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#if defined(CONFIG_ARCH_LEDS) && defined(LED_IDLE)
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# define BEGIN_IDLE() up_ledon(LED_IDLE)
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# define END_IDLE() up_ledoff(LED_IDLE)
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#else
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# define BEGIN_IDLE()
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# define END_IDLE()
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_idlepm
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*
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* Description:
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* Perform IDLE state power management.
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*
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****************************************************************************/
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#ifdef CONFIG_PM
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static void up_idlepm(void)
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{
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static enum pm_state_e oldstate = PM_NORMAL;
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enum pm_state_e newstate;
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irqstate_t flags;
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int ret;
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/* Decide, which power saving level can be obtained */
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newstate = pm_checkstate();
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/* Check for state changes */
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if (newstate != oldstate)
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{
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flags = irqsave();
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/* Perform board-specific, state-dependent logic here */
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llvdbg("newstate= %d oldstate=%d\n", newstate, oldstate);
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/* Then force the global state change */
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ret = pm_changestate(newstate);
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if (ret < 0)
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{
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/* The new state change failed, revert to the preceding state */
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(void)pm_changestate(oldstate);
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}
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else
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{
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/* Save the new state */
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oldstate = newstate;
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}
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/* MCU-specific power management logic */
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switch (newstate)
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{
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case PM_NORMAL:
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break;
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case PM_IDLE:
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break;
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case PM_STANDBY:
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stm32_pmstop(true);
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break;
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case PM_SLEEP:
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(void)stm32_pmstandby();
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break;
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default:
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break;
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}
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irqrestore(flags);
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}
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}
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#else
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# define up_idlepm()
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#endif
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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 their 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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sched_process_timer();
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#else
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/* Perform IDLE mode power management */
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up_idlepm();
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/* Sleep until an interrupt occurs to save power.
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*
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* NOTE: There is an STM32F107 errata that is fixed by the following
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* workaround:
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*
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* "2.17.11 Ethernet DMA not working after WFI/WFE instruction
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* Description
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* If a WFI/WFE instruction is executed to put the system in sleep mode
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* while the Ethernet MAC master clock on the AHB bus matrix is ON and all
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* remaining masters clocks are OFF, the Ethernet DMA will be not able to
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* perform any AHB master accesses during sleep mode."
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*
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* Workaround
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* Enable DMA1 or DMA2 clocks in the RCC_AHBENR register before
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* executing the WFI/WFE instruction."
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*
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* Here the workaround is just to avoid SLEEP mode for the connectivity
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* line parts if Ethernet is enabled. The errate recommends a more
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* general solution: Enabling DMA1/2 clocking in stm32f10xx_rcc.c if the
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* STM32107 Ethernet peripheral is enabled.
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*/
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#if !defined(CONFIG_STM32_CONNECTIVITYLINE) || !defined(CONFIG_STM32_ETHMAC)
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BEGIN_IDLE();
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asm("WFI");
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END_IDLE();
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#endif
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#endif
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}
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