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Posted to commits@nuttx.apache.org by ag...@apache.org on 2021/09/14 06:36:47 UTC
[incubator-nuttx] branch master updated: s32k1xx: added way to get
the reset cause in proc fs
This is an automated email from the ASF dual-hosted git repository.
aguettouche pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new 91c945a s32k1xx: added way to get the reset cause in proc fs
91c945a is described below
commit 91c945a2e896dd89685385b674a460f55321fae7
Author: Cis van Mierlo <ci...@nxp.com>
AuthorDate: Fri Sep 10 11:27:18 2021 +0200
s32k1xx: added way to get the reset cause in proc fs
---
arch/arm/src/s32k1xx/Make.defs | 4 +
arch/arm/src/s32k1xx/s32k1xx_resetcause.c | 334 ++++++++++++++++++++++++++++++
arch/arm/src/s32k1xx/s32k1xx_resetcause.h | 63 ++++++
3 files changed, 401 insertions(+)
diff --git a/arch/arm/src/s32k1xx/Make.defs b/arch/arm/src/s32k1xx/Make.defs
index f2cf130..9b34381 100644
--- a/arch/arm/src/s32k1xx/Make.defs
+++ b/arch/arm/src/s32k1xx/Make.defs
@@ -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)
diff --git a/arch/arm/src/s32k1xx/s32k1xx_resetcause.c b/arch/arm/src/s32k1xx/s32k1xx_resetcause.c
new file mode 100644
index 0000000..f29e5d9
--- /dev/null
+++ b/arch/arm/src/s32k1xx/s32k1xx_resetcause.c
@@ -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 */
diff --git a/arch/arm/src/s32k1xx/s32k1xx_resetcause.h b/arch/arm/src/s32k1xx/s32k1xx_resetcause.h
new file mode 100644
index 0000000..8e20e25
--- /dev/null
+++ b/arch/arm/src/s32k1xx/s32k1xx_resetcause.h
@@ -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 */