9f027208d4
the model is very useful to track the device info Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
338 lines
11 KiB
C
338 lines
11 KiB
C
/****************************************************************************
|
|
* drivers/mtd/skeleton.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 <errno.h>
|
|
|
|
#include <nuttx/fs/ioctl.h>
|
|
#include <nuttx/mtd/mtd.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* This type represents the state of the MTD device. The struct mtd_dev_s
|
|
* must appear at the beginning of the definition so that you can freely
|
|
* cast between pointers to struct mtd_dev_s and struct skel_dev_s.
|
|
*/
|
|
|
|
struct skel_dev_s
|
|
{
|
|
struct mtd_dev_s mtd;
|
|
|
|
/* Other implementation specific data may follow here */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/* MTD driver methods */
|
|
|
|
static int skel_erase(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks);
|
|
static ssize_t skel_bread(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks, FAR uint8_t *buf);
|
|
static ssize_t skel_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks, FAR const uint8_t *buf);
|
|
static ssize_t skel_read(FAR struct mtd_dev_s *dev, off_t offset,
|
|
size_t nbytes, FAR uint8_t *buffer);
|
|
#ifdef CONFIG_MTD_BYTE_WRITE
|
|
static ssize_t skel_write(FAR struct mtd_dev_s *dev, off_t offset,
|
|
size_t nbytes, FAR const uint8_t *buffer);
|
|
#endif
|
|
static int skel_ioctl(FAR struct mtd_dev_s *dev, int cmd,
|
|
unsigned long arg);
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* This structure holds the state of the MTD driver */
|
|
|
|
static struct skel_dev_s g_skeldev =
|
|
{
|
|
{
|
|
skel_erase,
|
|
skel_bread,
|
|
skel_bwrite,
|
|
skel_read,
|
|
#ifdef CONFIG_MTD_BYTE_WRITE
|
|
skel_write, /* Should be NULL if the byte write method is not supported */
|
|
#endif
|
|
skel_ioctl
|
|
},
|
|
|
|
/* Initialization of any other implementation specific data goes here */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: skel_erase
|
|
*
|
|
* Description:
|
|
* Erase several blocks, each of the size previously reported.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int skel_erase(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks)
|
|
{
|
|
FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
|
|
|
|
/* The interface definition assumes that all erase blocks are the same
|
|
* size. If that is not true for this particular device, then transform
|
|
* the start block and nblocks as necessary.
|
|
*/
|
|
|
|
/* Erase the specified blocks and return status (OK or a negated errno) */
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: skel_bread
|
|
*
|
|
* Description:
|
|
* Read the specified number of blocks into the user provided buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t skel_bread(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks, FAR uint8_t *buf)
|
|
{
|
|
FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
|
|
|
|
/* The interface definition assumes that all read/write blocks are the
|
|
* same size. If that is not true for this particular device, then
|
|
* transform the start block and nblocks as necessary.
|
|
*/
|
|
|
|
/* Read the specified blocks into the provided user buffer and return
|
|
* status (The positive, number of blocks actually read or a negated
|
|
* errno).
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: skel_bwrite
|
|
*
|
|
* Description:
|
|
* Write the specified number of blocks from the user provided buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t skel_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
|
|
size_t nblocks, FAR const uint8_t *buf)
|
|
{
|
|
FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
|
|
|
|
/* The interface definition assumes that all read/write blocks are the
|
|
* same size. If that is not true for this particular device, then
|
|
* transform the start block and nblocks as necessary.
|
|
*/
|
|
|
|
/* Write the specified blocks from the provided user buffer and return
|
|
* status (The positive, number of blocks actually written or a negated
|
|
* errno)
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: skel_read
|
|
*
|
|
* Description:
|
|
* Read the specified number of bytes to the user provided buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t skel_read(FAR struct mtd_dev_s *dev, off_t offset,
|
|
size_t nbytes, FAR uint8_t *buffer)
|
|
{
|
|
FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
|
|
|
|
/* Some devices may support byte oriented read (optional). Byte-oriented
|
|
* writing is inherently block oriented on most MTD devices and is not
|
|
* supported. It is recommended that low-level drivers not support read()
|
|
* if it requires buffering -- let the higher level logic handle that. If
|
|
* the read method is not implemented, just set the method pointer to NULL
|
|
* in the struct mtd_dev_s instance.
|
|
*/
|
|
|
|
/* The interface definition assumes that all read/write blocks are the
|
|
* same size. If that is not true for this particular device, then
|
|
* transform the start block and nblocks as necessary.
|
|
*/
|
|
|
|
/* Read the specified bytes into the provided user buffer and return
|
|
* status (The positive, number of bytes actually read or a negated
|
|
* errno)
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: skel_write
|
|
*
|
|
* Description:
|
|
* Some FLASH parts have the ability to write an arbitrary number of
|
|
* bytes to an arbitrary offset on the device. This method should be
|
|
* implement only for devices that support such access.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_MTD_BYTE_WRITE
|
|
static ssize_t skel_write(FAR struct mtd_dev_s *dev, off_t offset,
|
|
size_t nbytes, FAR const uint8_t *buffer)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: skel_ioctl
|
|
****************************************************************************/
|
|
|
|
static int skel_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
|
|
{
|
|
FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
|
|
int ret = -EINVAL; /* Assume good command with bad parameters */
|
|
|
|
switch (cmd)
|
|
{
|
|
case MTDIOC_GEOMETRY:
|
|
{
|
|
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)arg;
|
|
if (geo)
|
|
{
|
|
memset(geo, 0, sizeof(*geo));
|
|
|
|
/* Populate the geometry structure with information needed to
|
|
* know the capacity and how to access the device.
|
|
*
|
|
* NOTE:
|
|
* that the device is treated as though it where just an array
|
|
* of fixed size blocks. That is most likely not true, but the
|
|
* client will expect the device logic to do whatever is
|
|
* necessary to make it appear so.
|
|
*/
|
|
|
|
geo->blocksize = 512; /* Size of one read/write block */
|
|
geo->erasesize = 4096; /* Size of one erase block */
|
|
geo->neraseblocks = 1024; /* Number of erase blocks */
|
|
ret = OK;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case BIOC_PARTINFO:
|
|
{
|
|
FAR struct partition_info_s *info =
|
|
(FAR struct partition_info_s *)arg;
|
|
if (info != NULL)
|
|
{
|
|
info->numsectors = 8192;
|
|
info->sectorsize = 512;
|
|
info->startsector = 0;
|
|
info->parent[0] = '\0';
|
|
ret = OK;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case BIOC_XIPBASE:
|
|
{
|
|
FAR void **ppv = (FAR void**)arg;
|
|
|
|
if (ppv)
|
|
{
|
|
/* If media is directly acccesible, return (void*) base address
|
|
* of device memory. NULL otherwise. It is acceptable to omit
|
|
* this case altogether and simply return -ENOTTY.
|
|
*/
|
|
|
|
*ppv = NULL;
|
|
ret = OK;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MTDIOC_BULKERASE:
|
|
{
|
|
/* Erase the entire device */
|
|
|
|
ret = OK;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ret = -ENOTTY; /* Bad command */
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: skel_initialize
|
|
*
|
|
* Description:
|
|
* Create and initialize an MTD device instance. MTD devices are not
|
|
* registered in the file system, but are created as instances that can
|
|
* be bound to other functions (such as a block or character driver front
|
|
* end).
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct mtd_dev_s *skel_initialize(void)
|
|
{
|
|
/* Allocate an instance of the private data structure -- OR, if there can
|
|
* only be a single instance of the driver, then use a shared, global
|
|
* device structure.
|
|
*/
|
|
|
|
/* Return the implementation-specific state structure as the MTD device */
|
|
|
|
return (FAR struct mtd_dev_s *)&g_skeldev;
|
|
}
|