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arch/arm/sama5: Add code to report the reset reason

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This adds the necessary code and function to allow a board to determine the reason for a reset. This is useful in NXboot, for example.

Signed-off-by: Tim Hardisty <timh@jti.uk.com>
This commit is contained in:
Tim Hardisty 2025-05-02 13:23:04 +01:00 committed by Xiang Xiao
parent fb592064cb
commit f967a69748
2 changed files with 114 additions and 0 deletions
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50
arch/arm/src/sama5/sam_systemreset.c
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@ -35,6 +35,7 @@
#include "arm_internal.h"
#include "hardware/sam_rstc.h"
#include "sam_systemreset.h"
#ifdef CONFIG_SAMA5_SYSTEMRESET
@ -42,6 +43,55 @@
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_get_reset_cause
*
* Description:
* Get cause of the last CPU reset. This is done by reading reset status
* registger.
*
* Returned Value:
* CPU reset cause in form of macros defined in sam_systemreset.h. This is
* to avoid passing boardctl dependent structure to architecture layer.
* Board level specific code should include sam_systemreset.h and set
* boardctl result according to that. -1 is returned in case of invalid
* value in status register.
*
****************************************************************************/
#ifdef CONFIG_BOARDCTL_RESET_CAUSE
int sam_get_reset_cause(void)
{
int ret;
uint32_t rstsr;
rstsr = getreg32(SAM_RSTC_SR);
switch (rstsr & RSTC_SR_RSTTYP_MASK)
{
case RSTC_SR_RSTTYP_PWRUP:
ret = SAMA5_RESET_PWRUP;
break;
case RSTC_SR_RSTTYP_BACKUP:
ret = SAMA5_RESET_BACKUP;
break;
case RSTC_SR_RSTTYP_WDOG:
ret = SAMA5_RESET_WDOG;
break;
case RSTC_SR_RSTTYP_SWRST:
ret = SAMA5_RESET_SWRST;
break;
case RSTC_SR_RSTTYP_NRST:
ret = SAMA5_RESET_NRST;
break;
default:
ret = -1;
break;
}
return ret;
}
#endif
/****************************************************************************
* Name: up_systemreset
*

64
arch/arm/src/sama5/sam_systemreset.h Normal file
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@ -0,0 +1,64 @@
/****************************************************************************
* arch/arm/src/sama5/sam_systemreset.h
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_SAMA5_SAM_SYSTEMRESET_H
#define __ARCH_ARM_SRC_SAMA5_SAM_SYSTEMRESET_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define SAMA5_RESET_PWRUP 1
#define SAMA5_RESET_BACKUP 2
#define SAMA5_RESET_WDOG 3
#define SAMA5_RESET_SWRST 4
#define SAMA5_RESET_NRST 5
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: sam_get_reset_cause
*
* Description:
* Get cause of the last CPU reset. This is done by reading reset status
* registger.
*
* Returned Value:
* CPU reset cause in form of macros defined in sam_systemreset.h. This is
* to avoid passing boardctl dependent structure to architecture layer.
* Board level specific code should include sam_systemreset.h and set
* boardctl result according to that. -1 is returned in case of invalid
* value in status register.
*
****************************************************************************/
int sam_get_reset_cause(void);
#endif /* __ARCH_ARM_SRC_SAMA5_SAM_SYSTEMRESET_H */