126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/************************************************************************************
|
|
* arch/arm/src/efm32/efm32_rmu.c
|
|
*
|
|
* Copyright (C) 2015 Pierre-Noel Bouteville. All rights reserved.
|
|
* Author: Pierre-Noel Bouteville <pnb990@gmail.com>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Included Files
|
|
************************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
#include <arch/board/board.h>
|
|
|
|
#include "up_arch.h"
|
|
|
|
#include "chip/efm32_emu.h"
|
|
#include "chip/efm32_rmu.h"
|
|
|
|
#include "emf32_rmu.h"
|
|
|
|
/************************************************************************************
|
|
* Pre-processor Definitions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Private Types
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Private Data
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Public Data
|
|
************************************************************************************/
|
|
|
|
/* Variable old last reset cause of cpu. */
|
|
|
|
uint32_t g_efm32_rstcause;
|
|
|
|
/************************************************************************************
|
|
* Private Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Public Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: efm32_rmu_initialize
|
|
*
|
|
* Description:
|
|
* Store reset cause into g_efm32_rstcause then clear reset cause register.
|
|
*
|
|
************************************************************************************/
|
|
|
|
void efm32_rmu_initialize(void)
|
|
{
|
|
uint32_t locked;
|
|
|
|
g_efm32_rstcause = getreg32(EFM32_RMU_RSTCAUSE);
|
|
|
|
/* Now clear reset cause */
|
|
|
|
putreg32(RMU_CMD_RCCLR,EFM32_RMU_CMD);
|
|
|
|
/* Clear some reset causes not cleared with RMU CMD register
|
|
* (If EMU registers locked, they must be unlocked first)
|
|
*/
|
|
|
|
locked = getreg32(EFM32_EMU_LOCK) & EMU_LOCK_LOCKKEY_LOCKED;
|
|
if (locked)
|
|
{
|
|
/* EMU unlock */
|
|
|
|
putreg32(EMU_LOCK_LOCKKEY_LOCK,EMU_LOCK_LOCKKEY_UNLOCK);
|
|
}
|
|
|
|
modifyreg32(EFM32_EMU_AUXCTRL,0,EMU_AUXCTRL_HRCCLR);
|
|
modifyreg32(EFM32_EMU_AUXCTRL,EMU_AUXCTRL_HRCCLR,0);
|
|
|
|
if (locked)
|
|
{
|
|
/* EMU lock */
|
|
|
|
putreg32(EMU_LOCK_LOCKKEY_LOCK,EMU_LOCK_LOCKKEY_LOCK);
|
|
}
|
|
}
|