forked from xuos/xiuos
modify nuttx bug of lack of files
This commit is contained in:
TangYiwen123
@@ -0,0 +1,717 @@
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/****************************************************************************
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* drivers/mtd/ftl.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/mtd/mtd.h>
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#include <nuttx/drivers/rwbuffer.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Check if read/write buffer support is needed */
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#if defined(CONFIG_FTL_READAHEAD) || defined(CONFIG_FTL_WRITEBUFFER)
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# define FTL_HAVE_RWBUFFER 1
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#endif
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/* The maximum length of the device name paths is the maximum length of a
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* name plus 5 for the the length of "/dev/" and a NUL terminator.
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*/
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#define DEV_NAME_MAX (NAME_MAX + 5)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct ftl_struct_s
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{
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FAR struct mtd_dev_s *mtd; /* Contained MTD interface */
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struct mtd_geometry_s geo; /* Device geometry */
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#ifdef FTL_HAVE_RWBUFFER
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struct rwbuffer_s rwb; /* Read-ahead/write buffer support */
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#endif
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uint16_t blkper; /* R/W blocks per erase block */
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uint16_t refs; /* Number of references */
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bool unlinked; /* The driver has been unlinked */
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FAR uint8_t *eblock; /* One, in-memory erase block */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int ftl_open(FAR struct inode *inode);
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static int ftl_close(FAR struct inode *inode);
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static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
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off_t startblock, size_t nblocks);
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static ssize_t ftl_read(FAR struct inode *inode, FAR unsigned char *buffer,
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blkcnt_t start_sector, unsigned int nsectors);
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static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
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off_t startblock, size_t nblocks);
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static ssize_t ftl_write(FAR struct inode *inode,
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FAR const unsigned char *buffer, blkcnt_t start_sector,
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unsigned int nsectors);
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static int ftl_geometry(FAR struct inode *inode,
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FAR struct geometry *geometry);
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static int ftl_ioctl(FAR struct inode *inode, int cmd,
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unsigned long arg);
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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static int ftl_unlink(FAR struct inode *inode);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct block_operations g_bops =
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{
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ftl_open, /* open */
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ftl_close, /* close */
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ftl_read, /* read */
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ftl_write, /* write */
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ftl_geometry, /* geometry */
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ftl_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, ftl_unlink /* unlink */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ftl_open
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*
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* Description: Open the block device
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*
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****************************************************************************/
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static int ftl_open(FAR struct inode *inode)
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{
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FAR struct ftl_struct_s *dev;
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DEBUGASSERT(inode && inode->i_private);
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dev = (FAR struct ftl_struct_s *)inode->i_private;
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dev->refs++;
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return OK;
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}
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/****************************************************************************
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* Name: ftl_close
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*
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* Description: close the block device
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*
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****************************************************************************/
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static int ftl_close(FAR struct inode *inode)
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{
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FAR struct ftl_struct_s *dev;
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DEBUGASSERT(inode && inode->i_private);
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dev = (FAR struct ftl_struct_s *)inode->i_private;
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#ifdef CONFIG_FTL_WRITEBUFFER
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rwb_flush(&dev->rwb);
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#endif
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if (--dev->refs == 0 && dev->unlinked)
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{
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#ifdef FTL_HAVE_RWBUFFER
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rwb_uninitialize(&dev->rwb);
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#endif
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if (dev->eblock)
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{
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kmm_free(dev->eblock);
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}
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kmm_free(dev);
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}
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return OK;
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}
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/****************************************************************************
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* Name: ftl_reload
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*
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* Description: Read the specified number of sectors
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*
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****************************************************************************/
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static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
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off_t startblock, size_t nblocks)
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{
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struct ftl_struct_s *dev = (struct ftl_struct_s *)priv;
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ssize_t nread;
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/* Read the full erase block into the buffer */
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nread = MTD_BREAD(dev->mtd, startblock, nblocks, buffer);
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if (nread != nblocks)
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{
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ferr("ERROR: Read %zu blocks starting at block %jd failed: %zd\n",
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nblocks, (intmax_t)startblock, nread);
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}
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return nread;
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}
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/****************************************************************************
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* Name: ftl_read
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*
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* Description: Read the specified number of sectors
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*
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****************************************************************************/
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static ssize_t ftl_read(FAR struct inode *inode, unsigned char *buffer,
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blkcnt_t start_sector, unsigned int nsectors)
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{
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FAR struct ftl_struct_s *dev;
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finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
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DEBUGASSERT(inode && inode->i_private);
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dev = (FAR struct ftl_struct_s *)inode->i_private;
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#ifdef FTL_HAVE_RWBUFFER
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return rwb_read(&dev->rwb, start_sector, nsectors, buffer);
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#else
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return ftl_reload(dev, buffer, start_sector, nsectors);
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#endif
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}
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/****************************************************************************
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* Name: ftl_flush
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*
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* Description: Write the specified number of sectors
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*
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****************************************************************************/
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static int ftl_alloc_eblock(FAR struct ftl_struct_s *dev)
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{
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if (dev->eblock == NULL)
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{
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/* Allocate one, in-memory erase block buffer */
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dev->eblock = (FAR uint8_t *)kmm_malloc(dev->geo.erasesize);
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}
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return dev->eblock != NULL ? OK : -ENOMEM;
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}
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static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
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off_t startblock, size_t nblocks)
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{
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struct ftl_struct_s *dev = (struct ftl_struct_s *)priv;
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off_t alignedblock;
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off_t mask;
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off_t rwblock;
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off_t eraseblock;
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off_t offset;
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size_t remaining;
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size_t nxfrd;
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int nbytes;
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int ret;
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/* Get the aligned block. Here is is assumed: (1) The number of R/W blocks
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* per erase block is a power of 2, and (2) the erase begins with that same
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* alignment.
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*/
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mask = dev->blkper - 1;
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alignedblock = (startblock + mask) & ~mask;
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/* Handle partial erase blocks before the first unaligned block */
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remaining = nblocks;
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if (alignedblock > startblock)
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{
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/* Check if the write is shorter than to the end of the erase block */
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bool short_write = (remaining < (alignedblock - startblock));
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ret = ftl_alloc_eblock(dev);
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if (ret < 0)
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{
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ferr("ERROR: Failed to allocate an erase block buffer\n");
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return ret;
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}
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/* Read the full erase block into the buffer */
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rwblock = startblock & ~mask;
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nxfrd = MTD_BREAD(dev->mtd, rwblock, dev->blkper, dev->eblock);
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if (nxfrd != dev->blkper)
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{
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ferr("ERROR: Read erase block %jd failed: %zd\n",
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(intmax_t)rwblock, nxfrd);
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return -EIO;
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}
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/* Then erase the erase block */
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eraseblock = rwblock / dev->blkper;
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ret = MTD_ERASE(dev->mtd, eraseblock, 1);
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if (ret < 0)
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{
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ferr("ERROR: Erase block=%jd failed: %d\n",
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(intmax_t)eraseblock, ret);
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return ret;
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}
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/* Copy the user data at the end of the buffered erase block */
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offset = (startblock & mask) * dev->geo.blocksize;
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if (short_write)
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{
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nbytes = remaining * dev->geo.blocksize;
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}
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else
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{
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nbytes = dev->geo.erasesize - offset;
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}
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finfo("Copy %d bytes into erase block=%jd at offset=%jd\n",
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nbytes, (intmax_t)eraseblock, (intmax_t)offset);
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memcpy(dev->eblock + offset, buffer, nbytes);
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/* And write the erase block back to flash */
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nxfrd = MTD_BWRITE(dev->mtd, rwblock, dev->blkper, dev->eblock);
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if (nxfrd != dev->blkper)
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{
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ferr("ERROR: Write erase block %jd failed: %zu\n",
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(intmax_t)rwblock, nxfrd);
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return -EIO;
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}
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/* Then update for amount written */
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if (short_write)
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{
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remaining = 0;
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}
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else
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{
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remaining -= dev->blkper - (startblock & mask);
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}
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buffer += nbytes;
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}
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/* How handle full erase pages in the middle */
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while (remaining >= dev->blkper)
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{
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/* Erase the erase block */
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eraseblock = alignedblock / dev->blkper;
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ret = MTD_ERASE(dev->mtd, eraseblock, 1);
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if (ret < 0)
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{
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ferr("ERROR: Erase block=%jd failed: %d\n",
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(intmax_t)eraseblock, ret);
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return ret;
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}
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/* Write a full erase back to flash */
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finfo("Write %" PRId32 " bytes into erase block=%jd at offset=0\n",
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dev->geo.erasesize, (intmax_t)alignedblock);
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nxfrd = MTD_BWRITE(dev->mtd, alignedblock, dev->blkper, buffer);
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if (nxfrd != dev->blkper)
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{
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ferr("ERROR: Write erase block %jd failed: %zu\n",
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(intmax_t)alignedblock, nxfrd);
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return -EIO;
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}
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/* Then update for amount written */
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alignedblock += dev->blkper;
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remaining -= dev->blkper;
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buffer += dev->geo.erasesize;
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}
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/* Finally, handle any partial blocks after the last full erase block */
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if (remaining > 0)
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{
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ret = ftl_alloc_eblock(dev);
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if (ret < 0)
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{
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ferr("ERROR: Failed to allocate an erase block buffer\n");
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return ret;
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}
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/* Read the full erase block into the buffer */
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nxfrd = MTD_BREAD(dev->mtd, alignedblock, dev->blkper, dev->eblock);
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if (nxfrd != dev->blkper)
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{
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ferr("ERROR: Read erase block %jd failed: %zu\n",
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(intmax_t)alignedblock, nxfrd);
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return -EIO;
|
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}
|
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|
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/* Then erase the erase block */
|
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eraseblock = alignedblock / dev->blkper;
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ret = MTD_ERASE(dev->mtd, eraseblock, 1);
|
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if (ret < 0)
|
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{
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ferr("ERROR: Erase block=%jd failed: %d\n",
|
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(intmax_t)eraseblock, ret);
|
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return ret;
|
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}
|
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|
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/* Copy the user data at the beginning the buffered erase block */
|
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nbytes = remaining * dev->geo.blocksize;
|
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finfo("Copy %d bytes into erase block=%jd at offset=0\n",
|
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nbytes, (intmax_t)alignedblock);
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memcpy(dev->eblock, buffer, nbytes);
|
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/* And write the erase back to flash */
|
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|
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nxfrd = MTD_BWRITE(dev->mtd, alignedblock, dev->blkper, dev->eblock);
|
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if (nxfrd != dev->blkper)
|
||||
{
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||||
ferr("ERROR: Write erase block %jd failed: %zu\n",
|
||||
(intmax_t)alignedblock, nxfrd);
|
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return -EIO;
|
||||
}
|
||||
}
|
||||
|
||||
return nblocks;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_write
|
||||
*
|
||||
* Description: Write (or buffer) the specified number of sectors
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static ssize_t ftl_write(FAR struct inode *inode,
|
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FAR const unsigned char *buffer,
|
||||
blkcnt_t start_sector, unsigned int nsectors)
|
||||
{
|
||||
struct ftl_struct_s *dev;
|
||||
|
||||
finfo("sector: %" PRIu32 " nsectors: %u\n", start_sector, nsectors);
|
||||
|
||||
DEBUGASSERT(inode && inode->i_private);
|
||||
dev = (struct ftl_struct_s *)inode->i_private;
|
||||
#ifdef FTL_HAVE_RWBUFFER
|
||||
return rwb_write(&dev->rwb, start_sector, nsectors, buffer);
|
||||
#else
|
||||
return ftl_flush(dev, buffer, start_sector, nsectors);
|
||||
#endif
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_geometry
|
||||
*
|
||||
* Description: Return device geometry
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int ftl_geometry(FAR struct inode *inode,
|
||||
FAR struct geometry *geometry)
|
||||
{
|
||||
FAR struct ftl_struct_s *dev;
|
||||
|
||||
finfo("Entry\n");
|
||||
|
||||
DEBUGASSERT(inode);
|
||||
if (geometry)
|
||||
{
|
||||
dev = (struct ftl_struct_s *)inode->i_private;
|
||||
geometry->geo_available = true;
|
||||
geometry->geo_mediachanged = false;
|
||||
geometry->geo_writeenabled = true;
|
||||
geometry->geo_nsectors = dev->geo.neraseblocks * dev->blkper;
|
||||
geometry->geo_sectorsize = dev->geo.blocksize;
|
||||
|
||||
finfo("available: true mediachanged: false writeenabled: %s\n",
|
||||
geometry->geo_writeenabled ? "true" : "false");
|
||||
finfo("nsectors: %" PRIu32 " sectorsize: %u\n",
|
||||
geometry->geo_nsectors, geometry->geo_sectorsize);
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_ioctl
|
||||
*
|
||||
* Description: Return device geometry
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
|
||||
{
|
||||
FAR struct ftl_struct_s *dev;
|
||||
int ret;
|
||||
|
||||
finfo("Entry\n");
|
||||
DEBUGASSERT(inode && inode->i_private);
|
||||
|
||||
dev = (struct ftl_struct_s *)inode->i_private;
|
||||
|
||||
/* Only one block driver ioctl command is supported by this driver (and
|
||||
* that command is just passed on to the MTD driver in a slightly
|
||||
* different form).
|
||||
*/
|
||||
|
||||
if (cmd == BIOC_XIPBASE)
|
||||
{
|
||||
/* The argument accompanying the BIOC_XIPBASE should be non-NULL. If
|
||||
* DEBUG is enabled, we will catch it here instead of in the MTD
|
||||
* driver.
|
||||
*/
|
||||
|
||||
#ifdef CONFIG_DEBUG_FEATURES
|
||||
if (arg == 0)
|
||||
{
|
||||
ferr("ERROR: BIOC_XIPBASE argument is NULL\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Change the BIOC_XIPBASE command to the MTDIOC_XIPBASE command. */
|
||||
|
||||
cmd = MTDIOC_XIPBASE;
|
||||
}
|
||||
#ifdef CONFIG_FTL_WRITEBUFFER
|
||||
else if (cmd == BIOC_FLUSH)
|
||||
{
|
||||
return rwb_flush(&dev->rwb);
|
||||
}
|
||||
#endif
|
||||
|
||||
/* No other block driver ioctl commands are not recognized by this
|
||||
* driver. Other possible MTD driver ioctl commands are passed through
|
||||
* to the MTD driver (unchanged).
|
||||
*/
|
||||
|
||||
ret = MTD_IOCTL(dev->mtd, cmd, arg);
|
||||
if (ret < 0 && ret != -ENOTTY)
|
||||
{
|
||||
ferr("ERROR: MTD ioctl(%04x) failed: %d\n", cmd, ret);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_unlink
|
||||
*
|
||||
* Description: Unlink the device
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
|
||||
static int ftl_unlink(FAR struct inode *inode)
|
||||
{
|
||||
FAR struct ftl_struct_s *dev;
|
||||
|
||||
DEBUGASSERT(inode && inode->i_private);
|
||||
dev = (FAR struct ftl_struct_s *)inode->i_private;
|
||||
|
||||
dev->unlinked = true;
|
||||
if (dev->refs == 0)
|
||||
{
|
||||
#ifdef FTL_HAVE_RWBUFFER
|
||||
rwb_uninitialize(&dev->rwb);
|
||||
#endif
|
||||
if (dev->eblock)
|
||||
{
|
||||
kmm_free(dev->eblock);
|
||||
}
|
||||
|
||||
kmm_free(dev);
|
||||
}
|
||||
|
||||
return OK;
|
||||
}
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_initialize_by_path
|
||||
*
|
||||
* Description:
|
||||
* Initialize to provide a block driver wrapper around an MTD interface
|
||||
*
|
||||
* Input Parameters:
|
||||
* path - The block device path.
|
||||
* mtd - The MTD device that supports the FLASH interface.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int ftl_initialize_by_path(FAR const char *path, FAR struct mtd_dev_s *mtd)
|
||||
{
|
||||
struct ftl_struct_s *dev;
|
||||
int ret = -ENOMEM;
|
||||
|
||||
/* Sanity check */
|
||||
|
||||
if (path == NULL || mtd == NULL)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
finfo("path=\"%s\"\n", path);
|
||||
|
||||
/* Allocate a FTL device structure */
|
||||
|
||||
dev = (FAR struct ftl_struct_s *)kmm_zalloc(sizeof(struct ftl_struct_s));
|
||||
if (dev)
|
||||
{
|
||||
/* Initialize the FTL device structure */
|
||||
|
||||
dev->mtd = mtd;
|
||||
|
||||
/* Get the device geometry. (casting to uintptr_t first eliminates
|
||||
* complaints on some architectures where the sizeof long is different
|
||||
* from the size of a pointer).
|
||||
*/
|
||||
|
||||
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY,
|
||||
(unsigned long)((uintptr_t)&dev->geo));
|
||||
if (ret < 0)
|
||||
{
|
||||
ferr("ERROR: MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", ret);
|
||||
kmm_free(dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Get the number of R/W blocks per erase block */
|
||||
|
||||
dev->blkper = dev->geo.erasesize / dev->geo.blocksize;
|
||||
DEBUGASSERT(dev->blkper * dev->geo.blocksize == dev->geo.erasesize);
|
||||
|
||||
/* Configure read-ahead/write buffering */
|
||||
|
||||
#ifdef FTL_HAVE_RWBUFFER
|
||||
dev->rwb.blocksize = dev->geo.blocksize;
|
||||
dev->rwb.nblocks = dev->geo.neraseblocks * dev->blkper;
|
||||
dev->rwb.dev = (FAR void *)dev;
|
||||
dev->rwb.wrflush = ftl_flush;
|
||||
dev->rwb.rhreload = ftl_reload;
|
||||
|
||||
#if defined(CONFIG_FTL_WRITEBUFFER)
|
||||
dev->rwb.wrmaxblocks = dev->blkper;
|
||||
dev->rwb.wralignblocks = dev->blkper;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FTL_READAHEAD
|
||||
dev->rwb.rhmaxblocks = dev->blkper;
|
||||
#endif
|
||||
|
||||
ret = rwb_initialize(&dev->rwb);
|
||||
if (ret < 0)
|
||||
{
|
||||
ferr("ERROR: rwb_initialize failed: %d\n", ret);
|
||||
kmm_free(dev);
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Inode private data is a reference to the FTL device structure */
|
||||
|
||||
ret = register_blockdriver(path, &g_bops, 0, dev);
|
||||
if (ret < 0)
|
||||
{
|
||||
ferr("ERROR: register_blockdriver failed: %d\n", -ret);
|
||||
#ifdef FTL_HAVE_RWBUFFER
|
||||
rwb_uninitialize(&dev->rwb);
|
||||
#endif
|
||||
kmm_free(dev);
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: ftl_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize to provide a block driver wrapper around an MTD interface
|
||||
*
|
||||
* Input Parameters:
|
||||
* minor - The minor device number. The MTD block device will be
|
||||
* registered as as /dev/mtdblockN where N is the minor number.
|
||||
* mtd - The MTD device that supports the FLASH interface.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int ftl_initialize(int minor, FAR struct mtd_dev_s *mtd)
|
||||
{
|
||||
char path[DEV_NAME_MAX];
|
||||
|
||||
#ifdef CONFIG_DEBUG_FEATURES
|
||||
/* Sanity check */
|
||||
|
||||
if (minor < 0 || minor > 255)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Do the real work by ftl_initialize_by_path */
|
||||
|
||||
snprintf(path, DEV_NAME_MAX, "/dev/mtdblock%d", minor);
|
||||
return ftl_initialize_by_path(path, mtd);
|
||||
}
|
||||
Reference in New Issue
Block a user