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@ -0,0 +1,542 @@
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/****************************************************************************
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* drivers/mtd/ftl.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <stdio.h>
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#include <stdlib.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/fs.h>
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#include <nuttx/ioctl.h>
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#include <nuttx/mtd.h>
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#include <nuttx/rwbuffer.h>
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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#if defined(CONFIG_FS_READAHEAD) || (defined(CONFIG_FS_WRITABLE) && defined(CONFIG_FS_WRITEBUFFER))
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# defined CONFIG_FTL_RWBUFFER 1
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#endif
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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 CONFIG_FTL_RWBUFFER
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struct rwbuffer_s rwb; /* Read-ahead/write buffer support */
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#endif
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uint16 blkper; /* R/W blocks per erase block */
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#ifdef CONFIG_FS_WRITABLE
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FAR ubyte *eblock; /* One, in-memory erase block */
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#endif
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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 ubyte *buffer,
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off_t startblock, size_t nblocks);
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static ssize_t ftl_read(FAR struct inode *inode, unsigned char *buffer,
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size_t start_sector, unsigned int nsectors);
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#ifdef CONFIG_FS_WRITABLE
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static ssize_t ftl_flush(FAR void *priv, FAR const ubyte *buffer,
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off_t startblock, size_t nblocks);
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static ssize_t ftl_write(FAR struct inode *inode, const unsigned char *buffer,
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size_t start_sector, unsigned int nsectors);
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#endif
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static int ftl_geometry(FAR struct inode *inode, struct geometry *geometry);
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static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg);
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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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#ifdef CONFIG_FS_WRITABLE
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ftl_write, /* write */
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#else
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NULL, /* write */
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#endif
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ftl_geometry, /* geometry */
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ftl_ioctl /* ioctl */
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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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fvdbg("Entry\n");
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return OK;
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}
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/****************************************************************************
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* Name: ftl_closel
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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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fvdbg("Entry\n");
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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 numer of sectors
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*
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****************************************************************************/
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static ssize_t ftl_reload(FAR void *priv, FAR ubyte *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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fdbg("Read %d blocks starting at block %d failed: %d\n",
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nblocks, 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 numer 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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size_t start_sector, unsigned int nsectors)
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{
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struct ftl_struct_s *dev;
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fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
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DEBUGASSERT(inode && inode->i_private);
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dev = (struct ftl_struct_s *)inode->i_private;
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#ifdef CONFIG_FS_READAHEAD
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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_write
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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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#ifdef CONFIG_FS_WRITABLE
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static ssize_t ftl_flush(FAR void *priv, FAR const ubyte *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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/* 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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fdbg("Read erase block %d failed: %d\n", 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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fdbg("Erase block=%d failed: %d\n", 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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nbytes = dev->geo.erasesize - offset;
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fvdbg("Copy %d bytes into erase block=%d at offset=%d\n",
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nbytes, eraseblock, offset);
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memcpy(dev->eblock + offset, buffer, nbytes);
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/* And write the erase 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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fdbg("Write erase block %d failed: %d\n", 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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remaining -= dev->blkper - (startblock & mask);
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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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fdbg("Erase block=%d failed: %d\n", 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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fvdbg("Write %d bytes into erase block=%d at offset=0\n",
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dev->geo.erasesize, 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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fdbg("Write erase block %d failed: %d\n", , 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, handler any partial blocks after the last full erase block */
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if (remaining > 0)
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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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fdbg("Read erase block %d failed: %d\n", alignedblock, 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 = 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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fdbg("Erase block=%d failed: %d\n", eraseblock, ret);
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return ret;
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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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fvdbg("Copy %d bytes into erase block=%d at offset=0\n",
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nbytes, 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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nxfrd = MTD_BWRITE(dev->mtd, alignedblock, dev->blkper, dev->eblock);
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if (nxfrd != dev->blkper)
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{
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fdbg("Write erase block %d failed: %d\n", alignedblock, nxfrd);
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|
|
|
return -EIO;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return nblocks;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
|
* Name: ftl_write
|
|
|
|
|
*
|
|
|
|
|
* Description: Write (or buffer) the specified number of sectors
|
|
|
|
|
*
|
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
|
|
|
static ssize_t ftl_write(FAR struct inode *inode, const unsigned char *buffer,
|
|
|
|
|
size_t start_sector, unsigned int nsectors)
|
|
|
|
|
{
|
|
|
|
|
struct ftl_struct_s *dev;
|
|
|
|
|
|
|
|
|
|
fvdbg("sector: %d nsectors: %d sectorsize: %d\n");
|
|
|
|
|
|
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
|
|
|
dev = (struct ftl_struct_s *)inode->i_private;
|
|
|
|
|
#ifdef CONFIG_FS_WRITEBUFFER
|
|
|
|
|
return rwb_write(&dev->rwb, start_sector, nsectors, buffer);
|
|
|
|
|
#else
|
|
|
|
|
return ftl_flush(dev, buffer, start_sector, nsectors);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
|
* Name: ftl_geometry
|
|
|
|
|
*
|
|
|
|
|
* Description: Return device geometry
|
|
|
|
|
*
|
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
|
|
static int ftl_geometry(FAR struct inode *inode, struct geometry *geometry)
|
|
|
|
|
{
|
|
|
|
|
struct ftl_struct_s *dev;
|
|
|
|
|
|
|
|
|
|
fvdbg("Entry\n");
|
|
|
|
|
|
|
|
|
|
DEBUGASSERT(inode);
|
|
|
|
|
if (geometry)
|
|
|
|
|
{
|
|
|
|
|
dev = (struct ftl_struct_s *)inode->i_private;
|
|
|
|
|
geometry->geo_available = TRUE;
|
|
|
|
|
geometry->geo_mediachanged = FALSE;
|
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
|
|
|
geometry->geo_writeenabled = TRUE;
|
|
|
|
|
#else
|
|
|
|
|
geometry->geo_writeenabled = FALSE;
|
|
|
|
|
#endif
|
|
|
|
|
geometry->geo_nsectors = dev->geo.neraseblocks * dev->blkper;
|
|
|
|
|
geometry->geo_sectorsize = dev->geo.blocksize;
|
|
|
|
|
|
|
|
|
|
fvdbg("available: TRUE mediachanged: FALSE writeenabled: %s\n",
|
|
|
|
|
geometry->geo_writeenabled ? "TRUE" : "FALSE");
|
|
|
|
|
fvdbg("nsectors: %d sectorsize: %d\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)
|
|
|
|
|
{
|
|
|
|
|
struct ftl_struct_s *dev ;
|
|
|
|
|
int ret = -ENOTTY;
|
|
|
|
|
|
|
|
|
|
fvdbg("Entry\n");
|
|
|
|
|
|
|
|
|
|
/* Only one ioctl command is supported (and that is just passed on to MTD */
|
|
|
|
|
|
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
|
|
|
if (cmd == BIOC_XIPBASE && arg != 0)
|
|
|
|
|
{
|
|
|
|
|
dev = (struct ftl_struct_s *)inode->i_private;
|
|
|
|
|
ret = MTD_IOCTL(dev->mtd, MTDIOC_XIPBASE, arg);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
{
|
|
|
|
|
fdbg("MTD ioctl(MTDIOC_XIPBASE) failed: %d\n", ret);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
|
* Public Functions
|
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
|
* Name: ftl_initialize
|
|
|
|
|
*
|
|
|
|
|
* Description:
|
|
|
|
|
* Initialize to provide a block driver wrapper around an MTD interface
|
|
|
|
|
*
|
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
|
|
int ftl_initialize(int minor, ubyte *buffer, FAR struct mtd_dev_s *mtd)
|
|
|
|
|
{
|
|
|
|
|
struct ftl_struct_s *dev;
|
|
|
|
|
char devname[16];
|
|
|
|
|
int ret = -ENOMEM;
|
|
|
|
|
|
|
|
|
|
/* Sanity check */
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_DEBUG
|
|
|
|
|
if (minor < 0 || minor > 255 || !mtd)
|
|
|
|
|
{
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Allocate a ramdisk device structure */
|
|
|
|
|
|
|
|
|
|
dev = (struct ftl_struct_s *)malloc(sizeof(struct ftl_struct_s));
|
|
|
|
|
if (dev)
|
|
|
|
|
{
|
|
|
|
|
/* Initialize the ramdisk device structure */
|
|
|
|
|
|
|
|
|
|
dev->mtd = mtd;
|
|
|
|
|
|
|
|
|
|
/* Get the device geometry */
|
|
|
|
|
|
|
|
|
|
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY, (unsigned long)&dev->geo);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
{
|
|
|
|
|
fdbg("MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", ret);
|
|
|
|
|
free(dev);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Allocate one, in-memory erase block buffer */
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
|
|
|
dev->eblock = (FAR ubyte *)malloc(dev->geo.erasesize);
|
|
|
|
|
if (!dev->eblock)
|
|
|
|
|
{
|
|
|
|
|
fdbg("Failed to allocate an erase block buffer\n");
|
|
|
|
|
free(dev);
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* 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 CONFIG_FTL_RWBUFFER
|
|
|
|
|
dev->rwb.blocksize = dev->geo.blocksize;
|
|
|
|
|
dev->rwb.nblocks = dev->geo.neraseblocks * dev->blkper;
|
|
|
|
|
dev->rwb.dev = (FAR void *)dev;
|
|
|
|
|
|
|
|
|
|
#ifdef defined(CONFIG_FS_WRITABLE) && defined(CONFIG_FS_WRITEBUFFER)
|
|
|
|
|
dev->rwb.wrmaxblocks = dev->blkper;
|
|
|
|
|
dev->rwb.wrflush = ftl_flush;
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_FS_READAHEAD
|
|
|
|
|
dev->rwb.rhmaxblocks = dev->blkper;
|
|
|
|
|
dev->rwb.rhreload = ftl_reload;
|
|
|
|
|
#endif
|
|
|
|
|
ret = rwb_initialize(&dev->rwb);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
{
|
|
|
|
|
fdbg("rwb_initialize failed: %d\n", ret);
|
|
|
|
|
free(dev);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Create a MTD block device name */
|
|
|
|
|
|
|
|
|
|
snprintf(devname, 16, "/dev/mtdblock%d", minor);
|
|
|
|
|
|
|
|
|
|
/* Inode private data is a reference to the ramdisk device stgructure */
|
|
|
|
|
|
|
|
|
|
ret = register_blockdriver(devname, &g_bops, 0, dev);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
{
|
|
|
|
|
fdbg("register_blockdriver failed: %d\n", -ret);
|
|
|
|
|
free(dev);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
patacongo