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127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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* Copyright (C) 2015 Saurabh Singh
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_samd21
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* @{
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*
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* @file
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* @brief Implementation of the kernels power management interface
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*
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* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
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* @author Saurabh Singh <saurabh@cezy.co>
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*
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* @}
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*/
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#include "cpu.h"
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#include "arch/lpm_arch.h"
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enum system_sleepmode {
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/**
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* Idle 0 mode.
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* Potential Wake Up sources: Synchronous(APB, AHB), asynchronous.
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*/
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SYSTEM_SLEEPMODE_IDLE_0,
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/**
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* Idle 1 mode.
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* Potential Wake Up sources: Synchronous (APB), asynchronous
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*/
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SYSTEM_SLEEPMODE_IDLE_1,
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/**
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* Idle 2 mode.
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* Potential Wake Up sources: Asynchronous
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*/
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SYSTEM_SLEEPMODE_IDLE_2,
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/**
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* Standby mode.
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* Potential Wake Up sources: Asynchronous
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*/
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SYSTEM_SLEEPMODE_STANDBY,
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};
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static enum lpm_mode current_mode;
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static void start_lpm(void);
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void lpm_arch_init(void)
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{
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current_mode = LPM_ON;
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}
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enum lpm_mode lpm_arch_set(enum lpm_mode target)
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{
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enum lpm_mode last_mode = current_mode;
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switch (target) {
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case LPM_ON: /* Run mode */
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current_mode = LPM_ON;
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break;
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case LPM_IDLE: /* Sleep mode Idle 0 */
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current_mode = LPM_IDLE;
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/* Idle Mode 0 */
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_0;
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start_lpm();
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break;
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case LPM_SLEEP: /* Sleep mode Idle 1 */
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current_mode = LPM_SLEEP;
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/* Idle Mode 1 */
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_1;
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start_lpm();
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break;
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case LPM_POWERDOWN: /* Sleep mode Idle 2 */
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/* Idle Mode 2 */
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current_mode = LPM_POWERDOWN;
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_2;
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start_lpm();
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break;
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case LPM_OFF: /* Standby Mode - Potential Wake Up sources: Asynchronous */
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current_mode = LPM_OFF;
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/* Standby Mode */
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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start_lpm();
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break;
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default:
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break;
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}
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return last_mode;
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}
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static void start_lpm(void)
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{
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/* Executes a device DSB (Data Synchronization Barrier) */
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__DSB();
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/* Enter standby mode */
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__WFI();
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}
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enum lpm_mode lpm_arch_get(void)
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{
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return current_mode;
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}
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void lpm_arch_awake(void)
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{
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if (current_mode == LPM_SLEEP) {
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/* Re-init */
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cpu_init();
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}
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current_mode = LPM_ON;
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}
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/** Not needed */
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void lpm_arch_begin_awake(void){ }
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/** Not needed */
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void lpm_arch_end_awake(void){ }
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