2021-01-15 14:52:43 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* drivers/efuse/efuse.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 <sys/types.h>
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <stdbool.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <fcntl.h>
|
|
|
|
#include <assert.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <debug.h>
|
|
|
|
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
|
|
#include <nuttx/kmalloc.h>
|
|
|
|
#include <nuttx/semaphore.h>
|
|
|
|
#include <nuttx/efuse/efuse.h>
|
|
|
|
|
|
|
|
#ifdef CONFIG_EFUSE
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Pre-processor Definitions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Type Definitions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/* This structure describes the state of the upper half driver */
|
|
|
|
|
|
|
|
struct efuse_upperhalf_s
|
|
|
|
{
|
|
|
|
sem_t exclsem; /* Supports mutual exclusion */
|
|
|
|
FAR char *path; /* Registration path */
|
|
|
|
|
|
|
|
/* The contained lower-half driver */
|
|
|
|
|
|
|
|
FAR struct efuse_lowerhalf_s *lower;
|
|
|
|
};
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Function Prototypes
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int efuse_open(FAR struct file *filep);
|
|
|
|
static int efuse_close(FAR struct file *filep);
|
|
|
|
static ssize_t efuse_read(FAR struct file *filep, FAR char *buffer,
|
|
|
|
size_t buflen);
|
|
|
|
static ssize_t efuse_write(FAR struct file *filep, FAR const char *buffer,
|
|
|
|
size_t buflen);
|
|
|
|
static int efuse_ioctl(FAR struct file *filep, int cmd,
|
|
|
|
unsigned long arg);
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Data
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static const struct file_operations g_efuseops =
|
|
|
|
{
|
|
|
|
efuse_open, /* open */
|
|
|
|
efuse_close, /* close */
|
|
|
|
efuse_read, /* read */
|
|
|
|
efuse_write, /* write */
|
|
|
|
NULL, /* seek */
|
|
|
|
efuse_ioctl, /* ioctl */
|
|
|
|
NULL /* poll */
|
2022-01-10 15:51:17 +01:00
|
|
|
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
|
|
|
|
, NULL /* unlink */
|
|
|
|
#endif
|
2021-01-15 14:52:43 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_open
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* This function is called whenever the efuse timer device is opened.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int efuse_open(FAR struct file *filep)
|
|
|
|
{
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_close
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* This function is called when the efuse timer device is closed.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int efuse_close(FAR struct file *filep)
|
|
|
|
{
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_read
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* A dummy read method. This is provided only to satisfy the VFS layer.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static ssize_t efuse_read(FAR struct file *filep, FAR char *buffer,
|
|
|
|
size_t buflen)
|
|
|
|
{
|
|
|
|
/* Return zero -- usually meaning end-of-file */
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_write
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* A dummy write method. This is provided only to satisfy the VFS layer.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static ssize_t efuse_write(FAR struct file *filep, FAR const char *buffer,
|
|
|
|
size_t buflen)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_ioctl
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* The standard ioctl method. This is where ALL of the efuse timer
|
|
|
|
* work is done.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int efuse_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
FAR struct inode *inode = filep->f_inode;
|
|
|
|
FAR struct efuse_upperhalf_s *upper;
|
|
|
|
FAR struct efuse_lowerhalf_s *lower;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
minfo("cmd: %d arg: %lu\n", cmd, arg);
|
|
|
|
upper = inode->i_private;
|
|
|
|
DEBUGASSERT(upper != NULL);
|
|
|
|
lower = upper->lower;
|
|
|
|
DEBUGASSERT(lower != NULL);
|
|
|
|
|
|
|
|
/* Get exclusive access to the device structures */
|
|
|
|
|
|
|
|
ret = nxsem_wait(&upper->exclsem);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle built-in ioctl commands */
|
|
|
|
|
|
|
|
switch (cmd)
|
|
|
|
{
|
|
|
|
/* cmd: EFUSEIOC_READ_FIELD
|
|
|
|
* Description: Read a field
|
|
|
|
* Argument: A pointer to a struct efuse_param.
|
|
|
|
* Where the field is an array.
|
|
|
|
* Each item in the array is a pointer to an efuse_desc_t
|
|
|
|
* variable.
|
|
|
|
* An efuse_desc_t variable contains an offset to a field
|
|
|
|
* or subfield and its size in bits.
|
|
|
|
* The size param is a redundancy, and it is the sum
|
|
|
|
* of all subfields sizes from efuse_desc_t in bits.
|
|
|
|
* The data is a pointer to a pre-allocated space
|
|
|
|
* where the driver will load the data read from efuse.
|
|
|
|
*/
|
|
|
|
|
|
|
|
case EFUSEIOC_READ_FIELD:
|
|
|
|
{
|
|
|
|
FAR struct efuse_param *param =
|
|
|
|
(FAR struct efuse_param *)((uintptr_t)arg);
|
|
|
|
|
|
|
|
/* Read the efuse */
|
|
|
|
|
|
|
|
DEBUGASSERT(lower->ops->read_field); /* Required */
|
|
|
|
ret = lower->ops->read_field(lower,
|
|
|
|
param->field,
|
|
|
|
param->data,
|
|
|
|
param->size);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* cmd: EFUSEIOC_WRITE_FIELD
|
|
|
|
* Description: Write a field
|
|
|
|
* Argument: A pointer to a struct efuse_param.
|
|
|
|
* Where the field is an array.
|
|
|
|
* Each item in the array is a pointer to an efuse_desc_t
|
|
|
|
* variable.
|
|
|
|
* An efuse_desc_t variable contains an offset to a field
|
|
|
|
* or subfield and its size in bits.
|
|
|
|
* The size param is a redundancy, and it is the sum
|
|
|
|
* of all subfields sizes from efuse_desc_t in bits.
|
|
|
|
* The data is a pointer to a pre-allocated space
|
|
|
|
* where the user wrote the value that he wants
|
|
|
|
* to write in a field or subfield.
|
|
|
|
*/
|
|
|
|
|
|
|
|
case EFUSEIOC_WRITE_FIELD:
|
|
|
|
{
|
|
|
|
FAR struct efuse_param *param =
|
|
|
|
(FAR struct efuse_param *)((uintptr_t)arg);
|
|
|
|
|
|
|
|
/* Write the efuse */
|
|
|
|
|
|
|
|
DEBUGASSERT(lower->ops->write_field); /* Required */
|
|
|
|
ret = lower->ops->write_field(lower,
|
|
|
|
param->field,
|
|
|
|
param->data,
|
|
|
|
param->size);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
{
|
|
|
|
minfo("Forwarding unrecognized cmd: %d arg: %lu\n", cmd, arg);
|
|
|
|
|
|
|
|
/* Ioctls commands that are not recognized by the "upper-half"
|
|
|
|
* driver are forwarded to the lower half driver through this
|
|
|
|
* method.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (lower->ops->ioctl) /* Optional */
|
|
|
|
{
|
|
|
|
ret = lower->ops->ioctl(lower, cmd, arg);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ret = -ENOTTY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
nxsem_post(&upper->exclsem);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_register
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* This function binds an instance of a "lower half" efuse driver with
|
|
|
|
* the "upper half" efuse device and registers that device so that can
|
|
|
|
* be used by application code.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* dev path - The full path to the driver to be registered in the NuttX
|
|
|
|
* pseudo-filesystem. The recommended convention is to name all
|
|
|
|
* efuse drivers as "/dev/efuse".
|
|
|
|
* lower - A pointer to an instance of lower half efuse driver. This
|
|
|
|
* instance is bound to the efuse driver and must persists as long as
|
|
|
|
* the driver persists.
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* On success, a non-NULL handle is returned to the caller. In the event
|
|
|
|
* of any failure, a NULL value is returned.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
FAR void *efuse_register(FAR const char *path,
|
|
|
|
FAR struct efuse_lowerhalf_s *lower)
|
|
|
|
{
|
|
|
|
FAR struct efuse_upperhalf_s *upper;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
DEBUGASSERT(path && lower);
|
|
|
|
minfo("Entry: path=%s\n", path);
|
|
|
|
|
|
|
|
/* Allocate the upper-half data structure */
|
|
|
|
|
|
|
|
upper = (FAR struct efuse_upperhalf_s *)
|
|
|
|
kmm_zalloc(sizeof(struct efuse_upperhalf_s));
|
|
|
|
if (!upper)
|
|
|
|
{
|
|
|
|
merr("Upper half allocation failed\n");
|
|
|
|
goto errout;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialize the efuse timer device structure (it was already zeroed
|
|
|
|
* by kmm_zalloc()).
|
|
|
|
*/
|
|
|
|
|
|
|
|
nxsem_init(&upper->exclsem, 0, 1);
|
|
|
|
upper->lower = lower;
|
|
|
|
|
|
|
|
/* Copy the registration path */
|
|
|
|
|
|
|
|
upper->path = strdup(path);
|
|
|
|
if (!upper->path)
|
|
|
|
{
|
|
|
|
merr("Path allocation failed\n");
|
|
|
|
goto errout_with_upper;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Register the efuse timer device */
|
|
|
|
|
|
|
|
ret = register_driver(path, &g_efuseops, 0666, upper);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
merr("register_driver failed: %d\n", ret);
|
|
|
|
goto errout_with_path;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (FAR void *)upper;
|
|
|
|
|
|
|
|
errout_with_path:
|
|
|
|
kmm_free(upper->path);
|
|
|
|
|
|
|
|
errout_with_upper:
|
|
|
|
nxsem_destroy(&upper->exclsem);
|
|
|
|
kmm_free(upper);
|
|
|
|
|
|
|
|
errout:
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: efuse_unregister
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* This function can be called to disable and unregister the efuse
|
|
|
|
* device driver.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* handle - This is the handle that was returned by efuse_register()
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* None
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
void efuse_unregister(FAR void *handle)
|
|
|
|
{
|
|
|
|
FAR struct efuse_upperhalf_s *upper;
|
|
|
|
FAR struct efuse_lowerhalf_s *lower;
|
|
|
|
|
|
|
|
/* Recover the pointer to the upper-half driver state */
|
|
|
|
|
|
|
|
upper = (FAR struct efuse_upperhalf_s *)handle;
|
|
|
|
DEBUGASSERT(upper != NULL);
|
|
|
|
lower = upper->lower;
|
|
|
|
DEBUGASSERT(lower != NULL);
|
|
|
|
|
|
|
|
minfo("Unregistering: %s\n", upper->path);
|
|
|
|
|
|
|
|
/* Unregister the efuse timer device */
|
|
|
|
|
|
|
|
unregister_driver(upper->path);
|
|
|
|
|
|
|
|
/* Then free all of the driver resources */
|
|
|
|
|
|
|
|
kmm_free(upper->path);
|
|
|
|
nxsem_destroy(&upper->exclsem);
|
|
|
|
kmm_free(upper);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_EFUSE */
|