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s32k1xx: added way to get the reset cause in proc fs

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Cis van Mierlo 2021-09-10 11:27:18 +02:00 committed by Abdelatif Guettouche
parent aacbe981be
commit 91c945a2e8
3 changed files with 401 additions and 0 deletions
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4
arch/arm/src/s32k1xx/Make.defs
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@ -93,6 +93,10 @@ ifeq ($(CONFIG_S32K1XX_EEEPROM),y)
CHIP_CSRCS += s32k1xx_eeeprom.c
endif
ifeq ($(CONFIG_RESET_CAUSE_PROC_FS), y)
CHIP_CSRCS += s32k1xx_resetcause.c
endif
# Source files specific to the ARM CPU family and to the S32K1xx chip family
ifeq ($(CONFIG_ARCH_CHIP_S32K11X),y)

334
arch/arm/src/s32k1xx/s32k1xx_resetcause.c Normal file
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@ -0,0 +1,334 @@
/****************************************************************************
* arch/arm/src/s32k1xx/s32k1xx_resetcause.c
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/fs/procfs.h>
#include <nuttx/fs/dirent.h>
#include <nuttx/kmalloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <debug.h>
#include "arm_arch.h"
#include "hardware/s32k1xx_rcm.h"
#include "s32k1xx_resetcause.h"
#include "arm_internal.h"
#include <arch/board/board.h> /* Include last: has dependencies */
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Determines the size of an intermediate buffer that must be large enough
* to handle the longest line generated by this logic.
*/
#define RESETCAUSE_LINELEN 6
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure describes one open "file" */
struct resetcause_file_s
{
struct procfs_file_s base; /* Base open file structure */
unsigned int linesize; /* Number of valid characters in line[] */
char line[RESETCAUSE_LINELEN]; /* Pre-allocated buffer for formatted lines */
unsigned int resetcause; /* Variable representing the MCU specific reset cause */
};
static unsigned int g_reset_cause = 0;
#if defined(CONFIG_RESET_CAUSE_PROC_FS) && defined(CONFIG_FS_PROCFS)
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* File system methods */
static int resetcause_open(FAR struct file *filep,
FAR const char *relpath, int oflags, mode_t mode);
static int resetcause_close(FAR struct file *filep);
static ssize_t resetcause_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int resetcause_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int resetcause_stat(FAR const char *relpath,
FAR struct stat *buf);
/****************************************************************************
* Public Data
****************************************************************************/
const struct procfs_operations resetcause_operations =
{
resetcause_open, /* open */
resetcause_close, /* close */
resetcause_read, /* read */
NULL, /* write */
resetcause_dup, /* dup */
NULL, /* opendir */
NULL, /* closedir */
NULL, /* readdir */
NULL, /* rewinddir */
resetcause_stat /* stat */
};
static const struct procfs_entry_s g_resetcause_procfs =
{
"resetcause", &resetcause_operations
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: resetcause_open
****************************************************************************/
static int resetcause_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct resetcause_file_s *attr;
finfo("Open '%s'\n", relpath);
/* PROCFS is read-only. Any attempt to open with any kind of write
* access is not permitted.
*
* REVISIT: Write-able proc files could be quite useful.
*/
if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* "resetcause" is the only acceptable value for the relpath */
if (strcmp(relpath, "resetcause") != 0)
{
ferr("ERROR: relpath is '%s'\n", relpath);
return -ENOENT;
}
/* Allocate a container to hold the file attributes */
attr = kmm_zalloc(sizeof(struct resetcause_file_s));
if (!attr)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* Save the attributes as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)attr;
return OK;
}
/****************************************************************************
* Name: resetcause_close
****************************************************************************/
static int resetcause_close(FAR struct file *filep)
{
FAR struct resetcause_file_s *attr;
/* Recover our private data from the struct file instance */
attr = (FAR struct resetcause_file_s *)filep->f_priv;
DEBUGASSERT(attr);
/* Release the file attributes structure */
kmm_free(attr);
filep->f_priv = NULL;
return OK;
}
/****************************************************************************
* Name: resetcause_read
****************************************************************************/
static ssize_t resetcause_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct resetcause_file_s *attr;
size_t linesize;
off_t offset;
ssize_t ret;
finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
attr = (FAR struct resetcause_file_s *)filep->f_priv;
DEBUGASSERT(attr);
/* Get the resetcause value and store it */
attr->resetcause = g_reset_cause;
/* Convert the resetcause to a string */
linesize = snprintf(attr->line, RESETCAUSE_LINELEN,
"0x%x", attr->resetcause);
/* Save the linesize in case we are re-entered with f_pos > 0 */
attr->linesize = linesize;
/* Transfer the system reset cause to user receive buffer */
offset = filep->f_pos;
ret = procfs_memcpy(attr->line, attr->linesize, buffer, buflen, &offset);
return ret;
}
/****************************************************************************
* Name: resetcause_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int resetcause_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct resetcause_file_s *oldattr;
FAR struct resetcause_file_s *newattr;
finfo("Dup %p->%p\n", oldp, newp);
/* Recover our private data from the old struct file instance */
oldattr = (FAR struct resetcause_file_s *)oldp->f_priv;
DEBUGASSERT(oldattr);
/* Allocate a new container to hold the task and attribute selection */
newattr = kmm_malloc(sizeof(struct resetcause_file_s));
if (!newattr)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* The copy the file attributes from the old attributes to the new */
memcpy(newattr, oldattr, sizeof(struct resetcause_file_s));
/* Save the new attributes in the new file structure */
newp->f_priv = (FAR void *)newattr;
return OK;
}
/****************************************************************************
* Name: resetcause_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int resetcause_stat(FAR const char *relpath, FAR struct stat *buf)
{
/* "resetcause" is the only acceptable value for the relpath */
if (strcmp(relpath, "resetcause") != 0)
{
ferr("ERROR: relpath is '%s'\n", relpath);
return -ENOENT;
}
/* "resetcause" is the name for a read-only file */
memset(buf, 0, sizeof(struct stat));
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: s32k1xx_resetcause_init
*
* Description: This function initializes the resetcause
* It will get the resetcause and store it
*
****************************************************************************/
void s32k1xx_resetcause_init(void)
{
uint32_t reset_cause_register = 0;
/* get the reset cause */
reset_cause_register = getreg32(S32K1XX_RCM_SRS);
/* save it in the global variable */
g_reset_cause = (unsigned int) reset_cause_register;
}
/****************************************************************************
* Name: s32k1xx_resetcause_initialize_procfs
*
* Description: This function registrates the reset cause as a proc fs
* Returns 0 if OK, error number otherwise
*
****************************************************************************/
int s32k1xx_resetcause_initialize_procfs(void)
{
return procfs_register(&g_resetcause_procfs);
}
#endif /* CONFIG_RESET_CAUSE_PROC_FS && CONFIG_FS_PROCFS */

63
arch/arm/src/s32k1xx/s32k1xx_resetcause.h Normal file
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@ -0,0 +1,63 @@
/****************************************************************************
* arch/arm/src/s32k1xx/s32k1xx_resetcause.h
*
* 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_S32K1XX_RESETCAUSE_H
#define __ARCH_ARM_SRC_S32K1XX_RESETCAUSE_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: s32k1xx_resetcause_init
*
* Description: This function initializes the resetcause
* It will get the resetcause and store it
*
****************************************************************************/
void s32k1xx_resetcause_init(void);
/****************************************************************************
* Name: s32k1xx_resetcause_initialize_procfs
*
* Description: This function registrates the reset cause as a proc fs
* Returns 0 if OK, error number otherwise
*
****************************************************************************/
int s32k1xx_resetcause_initialize_procfs(void);
#endif /* __ARCH_ARM_SRC_S32K1XX_RESETCAUSE_H */