2223 lines
65 KiB
C
2223 lines
65 KiB
C
/****************************************************************************
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* drivers/mtd/smart.c
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*
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* Sector Mapped Allocation for Really Tiny (SMART) Flash block driver.
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*
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* Copyright (C) 2013 Ken Pettit. All rights reserved.
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* Author: Ken Pettit <pettitkd@gmail.com>
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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 <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 <stddef.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.h>
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#include <nuttx/smart.h>
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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#define SMART_STATUS_COMMITTED 0x80
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#define SMART_STATUS_RELEASED 0x40
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#define SMART_STATUS_SIZEBITS 0x1C
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#define SMART_STATUS_VERBITS 0x03
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#define SMART_STATUS_VERSION 0x01
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#define SMART_SECTSIZE_256 0x00
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#define SMART_SECTSIZE_512 0x04
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#define SMART_SECTSIZE_1024 0x08
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#define SMART_SECTSIZE_2048 0x0C
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#define SMART_SECTSIZE_4096 0x10
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#define SMART_SECTSIZE_8192 0x14
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#define SMART_SECTSIZE_16384 0x18
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#define SMART_FMT_STAT_UNKNOWN 0
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#define SMART_FMT_STAT_FORMATTED 1
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#define SMART_FMT_STAT_NOFMT 2
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#define SMART_FMT_POS1 sizeof(struct smart_sect_header_s)
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#define SMART_FMT_POS2 (SMART_FMT_POS1 + 1)
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#define SMART_FMT_POS3 (SMART_FMT_POS1 + 2)
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#define SMART_FMT_POS4 (SMART_FMT_POS1 + 3)
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#define SMART_FMT_SIG1 'S'
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#define SMART_FMT_SIG2 'M'
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#define SMART_FMT_SIG3 'R'
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#define SMART_FMT_SIG4 'T'
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#define SMART_FMT_VERSION_POS (SMART_FMT_POS1 + 4)
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#define SMART_FMT_NAMESIZE_POS (SMART_FMT_POS1 + 5)
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#define SMART_FMT_ROOTDIRS_POS (SMART_FMT_POS1 + 6)
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#define SMARTFS_FMT_AGING_POS 32
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#define SMART_FMT_VERSION 1
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#define SMART_FIRST_ALLOC_SECTOR 12 /* First logical sector number we will
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* use for assignment of requested Alloc
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* sectors. All enries below this are
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* reserved (some for root dir entries,
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* other for our use, such as format
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* sector, etc. */
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#if defined(CONFIG_FS_READAHEAD) || (defined(CONFIG_FS_WRITABLE) && defined(CONFIG_FS_WRITEBUFFER))
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# define CONFIG_SMART_RWBUFFER 1
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#endif
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#ifndef CONFIG_MTD_SMART_SECTOR_SIZE
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# define CONFIG_MTD_SMART_SECTOR_SIZE 1024
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#endif
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#ifndef offsetof
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#define offsetof(type, member) ( (size_t) &( ( (type *) 0)->member))
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct smart_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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uint16_t neraseblocks; /* Number of erase blocks or sub-sectors */
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uint16_t freesectors; /* Total number of free sectors */
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uint16_t mtdBlksPerSector; /* Number of MTD blocks per SMART Sector */
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uint16_t sectorsPerBlk; /* Number of sectors per erase block */
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uint16_t sectorsize; /* Sector size on device */
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uint16_t totalsectors; /* Total number of sectors on device */
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FAR uint16_t *sMap; /* Virtual to physical sector map */
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FAR uint8_t *releasecount; /* Count of released sectors per erase block */
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FAR uint8_t *freecount; /* Count of free sectors per erase block */
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FAR char *rwbuffer; /* Our sector read/write buffer */
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const FAR char *partname; /* Optional partition name */
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uint8_t formatversion; /* Format version on the device */
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uint8_t formatstatus; /* Indicates the status of the device format */
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uint8_t namesize; /* Length of filenames on this device */
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#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
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uint8_t rootdirentries; /* Number of root directory entries */
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uint8_t minor; /* Minor number of the block entry */
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#endif
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};
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#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
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struct smart_multiroot_device_s
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{
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FAR struct smart_struct_s* dev;
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uint8_t rootdirnum;
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};
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#endif
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struct smart_sect_header_s
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{
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uint8_t logicalsector[2]; /* The logical sector number */
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uint8_t seq[2]; /* Incrementing sequence number */
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uint8_t status; /* Status of this sector:
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* Bit 7: 1 = Not commited
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* 0 = commited
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* Bit 6: 1 = Not released
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* 0 = released
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* Bit 5: Reserved - 1
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* Bit 4: Reserved - 1
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* Bit 3: Reserved - 1
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* Bit 2: Reserved - 1
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* Bit 1-0: Format version */
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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 smart_open(FAR struct inode *inode);
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static int smart_close(FAR struct inode *inode);
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static ssize_t smart_reload(struct smart_struct_s *dev, FAR uint8_t *buffer,
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off_t startblock, size_t nblocks);
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static ssize_t smart_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 smart_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 smart_geometry(FAR struct inode *inode, struct geometry *geometry);
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static int smart_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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smart_open, /* open */
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smart_close, /* close */
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smart_read, /* read */
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#ifdef CONFIG_FS_WRITABLE
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smart_write, /* write */
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#else
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NULL, /* write */
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#endif
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smart_geometry, /* geometry */
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smart_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: smart_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 smart_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: smart_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 smart_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: smart_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 smart_reload(struct smart_struct_s *dev, FAR uint8_t *buffer,
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off_t startblock, size_t nblocks)
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{
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ssize_t nread;
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ssize_t mtdBlocks, mtdStartBlock;
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/* Calculate the number of MTD blocks to read */
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mtdBlocks = nblocks * dev->mtdBlksPerSector;
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/* Calculate the first MTD block number */
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mtdStartBlock = startblock * dev->mtdBlksPerSector;
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/* Read the full erase block into the buffer */
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fdbg("Read %d blocks starting at block %d\n", mtdBlocks, mtdStartBlock);
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nread = MTD_BREAD(dev->mtd, mtdStartBlock, mtdBlocks, buffer);
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if (nread != mtdBlocks)
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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: smart_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 smart_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 smart_struct_s *dev;
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fvdbg("SMART: sector: %d nsectors: %d\n", start_sector, nsectors);
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DEBUGASSERT(inode && inode->i_private);
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#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
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dev = ((struct smart_multiroot_device_s*) inode->i_private)->dev;
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#else
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dev = (struct smart_struct_s *)inode->i_private;
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#endif
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return smart_reload(dev, buffer, start_sector, nsectors);
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}
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/****************************************************************************
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* Name: smart_write
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*
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* Description: Write (or buffer) 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 smart_write(FAR struct inode *inode, const unsigned char *buffer,
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size_t start_sector, unsigned int nsectors)
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{
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struct smart_struct_s *dev;
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off_t alignedblock;
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off_t mask;
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off_t blkstowrite;
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off_t offset;
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off_t nextblock;
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off_t mtdBlksPerErase;
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off_t eraseblock;
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size_t remaining;
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size_t nxfrd;
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int ret;
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off_t mtdstartblock, mtdblockcount;
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fvdbg("sector: %d nsectors: %d\n", start_sector, nsectors);
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DEBUGASSERT(inode && inode->i_private);
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#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
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dev = ((struct smart_multiroot_device_s*) inode->i_private)->dev;
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#else
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dev = (struct smart_struct_s *)inode->i_private;
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#endif
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/* I think maybe we need to lock on a mutex here */
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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->sectorsPerBlk - 1;
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alignedblock = ((start_sector + mask) & ~mask) * dev->mtdBlksPerSector;
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/* Convert SMART blocks into MTD blocks */
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mtdstartblock = start_sector * dev->mtdBlksPerSector;
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mtdblockcount = nsectors * dev->mtdBlksPerSector;
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mtdBlksPerErase = dev->mtdBlksPerSector * dev->sectorsPerBlk;
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fvdbg("mtdsector: %d mtdnsectors: %d\n", mtdstartblock, mtdblockcount);
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/* Start at first block to be written */
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remaining = mtdblockcount;
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nextblock = mtdstartblock;
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offset = 0;
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/* Loop for all blocks to be written */
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while (remaining > 0)
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{
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/* If this is an aligned block, then erase the block */
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if (alignedblock == nextblock)
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{
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/* Erase the erase block */
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eraseblock = alignedblock / mtdBlksPerErase;
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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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/* Unlock the mutex if we add one */
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return ret;
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}
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}
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/* Calculate the number of blocks to write. */
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blkstowrite = mtdBlksPerErase;
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if (nextblock != alignedblock)
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{
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blkstowrite = alignedblock - nextblock;
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}
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if (blkstowrite > remaining)
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{
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blkstowrite = remaining;
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}
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/* Try to write to the sector. */
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fdbg("Write MTD block %d from offset %d\n", nextblock, offset);
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nxfrd = MTD_BWRITE(dev->mtd, nextblock, blkstowrite, &buffer[offset]);
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if (nxfrd != blkstowrite)
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{
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/* The block is not empty!! What to do? */
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fdbg("Write block %d failed: %d.\n", nextblock, nxfrd);
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/* Unlock the mutex if we add one */
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return -EIO;
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}
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/* Then update for amount written */
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nextblock += blkstowrite;
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remaining -= blkstowrite;
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offset += blkstowrite * dev->geo.blocksize;
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alignedblock += mtdBlksPerErase;
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}
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return nsectors;
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}
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#endif /* CONFIG_FS_WRITABLE */
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/****************************************************************************
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* Name: smart_geometry
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*
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* Description: Return device geometry
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*
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****************************************************************************/
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static int smart_geometry(FAR struct inode *inode, struct geometry *geometry)
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{
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struct smart_struct_s *dev;
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uint32_t erasesize;
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fvdbg("Entry\n");
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DEBUGASSERT(inode);
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if (geometry)
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{
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#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
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dev = ((struct smart_multiroot_device_s*) inode->i_private)->dev;
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#else
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dev = (struct smart_struct_s *)inode->i_private;
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#endif
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geometry->geo_available = true;
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geometry->geo_mediachanged = false;
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#ifdef CONFIG_FS_WRITABLE
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geometry->geo_writeenabled = true;
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#else
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geometry->geo_writeenabled = false;
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#endif
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erasesize = dev->geo.erasesize;
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if (erasesize == 0)
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{
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erasesize = 65536;
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}
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geometry->geo_nsectors = dev->geo.neraseblocks * erasesize /
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dev->sectorsize;
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geometry->geo_sectorsize = dev->sectorsize;
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fvdbg("available: true mediachanged: false writeenabled: %s\n",
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geometry->geo_writeenabled ? "true" : "false");
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fvdbg("nsectors: %d sectorsize: %d\n",
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geometry->geo_nsectors, geometry->geo_sectorsize);
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return OK;
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}
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return -EINVAL;
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}
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|
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/****************************************************************************
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* Name: smart_setsectorsize
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*
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* Description: Sets the device's sector size and recalculates sector size
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* dependant variables.
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*
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****************************************************************************/
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static int smart_setsectorsize(struct smart_struct_s *dev, uint16_t size)
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{
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uint32_t erasesize;
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uint32_t totalsectors;
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/* Validate the size isn't zero so we don't divide by zero below */
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if (size == 0)
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{
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size = CONFIG_MTD_SMART_SECTOR_SIZE;
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}
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erasesize = dev->geo.erasesize;
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dev->neraseblocks = dev->geo.neraseblocks;
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/* Most FLASH devices have erase size of 64K, but geo.erasesize is only
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* 16 bits, so it will be zero
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*/
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if (erasesize == 0)
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{
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erasesize = 65536;
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}
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dev->sectorsize = size;
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dev->mtdBlksPerSector = dev->sectorsize / dev->geo.blocksize;
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dev->sectorsPerBlk = erasesize / dev->sectorsize;
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/* Release any existing rwbuffer and sMap */
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if (dev->sMap != NULL)
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{
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kfree(dev->sMap);
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}
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if (dev->rwbuffer != NULL)
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{
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kfree(dev->rwbuffer);
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}
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/* Allocate a virtual to physical sector map buffer. Also allocate
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* the storage space for releasecount and freecounts.
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*/
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totalsectors = dev->neraseblocks * dev->sectorsPerBlk;
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dev->totalsectors = (uint16_t) totalsectors;
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dev->sMap = (uint16_t *) kmalloc(totalsectors * sizeof(uint16_t) +
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(dev->neraseblocks << 1));
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if (!dev->sMap)
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{
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fdbg("Error allocating SMART virtual map buffer\n");
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kfree(dev);
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return -EINVAL;
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}
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|
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dev->releasecount = (uint8_t *) dev->sMap + (totalsectors * sizeof(uint16_t));
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dev->freecount = dev->releasecount + dev->neraseblocks;
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|
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/* Allocate a read/write buffer */
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dev->rwbuffer = (char *) kmalloc(size);
|
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if (!dev->rwbuffer)
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{
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|
fdbg("Error allocating SMART read/write buffer\n");
|
|
kfree(dev->sMap);
|
|
kfree(dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_bytewrite
|
|
*
|
|
* Description: Writes a non-page size count of bytes to the underlying
|
|
* MTD device. If the MTD driver supports a direct impl of
|
|
* write, then it uses it, otherwise it does a read-modify-write
|
|
* and depends on the architecture of the flash to only program
|
|
* bits that acutally changed.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t smart_bytewrite(struct smart_struct_s *dev, size_t offset,
|
|
int nbytes, const uint8_t *buffer)
|
|
{
|
|
ssize_t ret;
|
|
|
|
#ifdef CONFIG_MTD_BYTE_WRITE
|
|
/* Check if the underlying MTD device supports write */
|
|
|
|
if (dev->mtd->write != NULL)
|
|
{
|
|
/* Use the MTD's write method to write individual bytes */
|
|
|
|
ret = dev->mtd->write(dev->mtd, offset, nbytes, buffer);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Perform block-based read-modify-write */
|
|
|
|
uint16_t startblock;
|
|
uint16_t nblocks;
|
|
|
|
/* First calculate the start block and number of blocks affected */
|
|
|
|
startblock = offset / dev->geo.blocksize;
|
|
nblocks = (nbytes + dev->geo.blocksize-1) / dev->geo.blocksize;
|
|
DEBUGASSERT(nblocks <= dev->mtdBlksPerSector);
|
|
|
|
/* Do a block read */
|
|
|
|
ret = MTD_BREAD(dev->mtd, startblock, nblocks, (uint8_t *) dev->rwbuffer);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d reading from device\n", -ret);
|
|
goto errout;
|
|
}
|
|
|
|
/* Modify the data */
|
|
|
|
memcpy(&dev->rwbuffer[offset - startblock * dev->geo.blocksize], buffer, nbytes);
|
|
|
|
/* Write the data back to the device */
|
|
|
|
ret = MTD_BWRITE(dev->mtd, startblock, nblocks, (uint8_t *) dev->rwbuffer);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d writing to device\n", -ret);
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
ret = nbytes;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_scan
|
|
*
|
|
* Description: Performs a scan of the MTD device searching for format
|
|
* information and fills in logical sector mapping, freesector
|
|
* count, etc.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int smart_scan(struct smart_struct_s *dev)
|
|
{
|
|
int sector;
|
|
int ret;
|
|
int offset;
|
|
uint16_t totalsectors;
|
|
uint16_t sectorsize;
|
|
uint16_t logicalsector;
|
|
uint16_t seq1;
|
|
uint16_t seq2;
|
|
size_t readaddress;
|
|
struct smart_sect_header_s header;
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
int x;
|
|
char devname[22];
|
|
struct smart_multiroot_device_s *rootdirdev;
|
|
#endif
|
|
|
|
fvdbg("Entry\n");
|
|
|
|
/* Read the 1st header from the device. We always keep the
|
|
* 1st sector's header's sectorsize field accurate, even
|
|
* after we erase an MTD block/sector */
|
|
|
|
ret = MTD_READ(dev->mtd, 0, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
goto err_out;
|
|
}
|
|
|
|
/* Now set the sectorsize and other sectorsize derived variables */
|
|
|
|
if (header.status == CONFIG_SMARTFS_ERASEDSTATE)
|
|
{
|
|
sectorsize = CONFIG_MTD_SMART_SECTOR_SIZE;
|
|
}
|
|
else
|
|
{
|
|
sectorsize = (header.status & SMART_STATUS_SIZEBITS) << 7;
|
|
}
|
|
|
|
ret = smart_setsectorsize(dev, sectorsize);
|
|
if (ret != OK)
|
|
{
|
|
goto err_out;
|
|
}
|
|
|
|
/* Initialize the device variables */
|
|
|
|
totalsectors = dev->neraseblocks * dev->sectorsPerBlk;
|
|
dev->formatstatus = SMART_FMT_STAT_NOFMT;
|
|
dev->freesectors = totalsectors;
|
|
|
|
/* Initialize the freecount and releasecount arrays */
|
|
|
|
for (sector = 0; sector < dev->neraseblocks; sector++)
|
|
{
|
|
dev->freecount[sector] = dev->sectorsPerBlk;
|
|
dev->releasecount[sector] = 0;
|
|
}
|
|
|
|
/* Initialize the sector map */
|
|
|
|
for (sector = 0; sector < totalsectors; sector++)
|
|
{
|
|
dev->sMap[sector] = -1;
|
|
}
|
|
|
|
/* Now scan the MTD device */
|
|
|
|
for (sector = 0; sector < totalsectors; sector++)
|
|
{
|
|
fvdbg("Scan sector %d\n", sector);
|
|
|
|
/* Calculate the read address for this sector */
|
|
|
|
readaddress = sector * dev->mtdBlksPerSector * dev->geo.blocksize;
|
|
|
|
/* Read the header for this sector */
|
|
|
|
ret = MTD_READ(dev->mtd, readaddress, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
goto err_out;
|
|
}
|
|
|
|
/* Get the logical sector number for this physical sector */
|
|
|
|
logicalsector = *((uint16_t *) header.logicalsector);
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0x00
|
|
if (logicalsector == 0)
|
|
{
|
|
logicalsector = -1;
|
|
}
|
|
#endif
|
|
|
|
/* Test if this sector has been committed */
|
|
|
|
if ((header.status & SMART_STATUS_COMMITTED) ==
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_COMMITTED))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/* This block is commited, therefore not free. Update the
|
|
* erase block's freecount.
|
|
*/
|
|
|
|
dev->freecount[sector / dev->sectorsPerBlk]--;
|
|
dev->freesectors--;
|
|
|
|
/* Test if this sector has been release and if it has,
|
|
* update the erase block's releasecount.
|
|
*/
|
|
|
|
if ((header.status & SMART_STATUS_RELEASED) !=
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_RELEASED))
|
|
{
|
|
dev->releasecount[sector / dev->sectorsPerBlk]++;
|
|
continue;
|
|
}
|
|
|
|
if ((header.status & SMART_STATUS_VERBITS) != SMART_STATUS_VERSION)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/* Validate the logical sector number is in bounds */
|
|
|
|
if (logicalsector >= totalsectors)
|
|
{
|
|
/* Error in logical sector read from the MTD device */
|
|
|
|
fdbg("Invalid logical sector %d at physical %d.\n",
|
|
logicalsector, sector);
|
|
continue;
|
|
}
|
|
|
|
/* If this is logical sector zero, then read in the signature
|
|
* information to validate the format signature.
|
|
*/
|
|
|
|
if (logicalsector == 0)
|
|
{
|
|
/* Read the sector data */
|
|
|
|
ret = MTD_READ(dev->mtd, readaddress, 32,
|
|
(uint8_t*) dev->rwbuffer);
|
|
if (ret != 32)
|
|
{
|
|
fdbg("Error reading physical sector %d.\n", sector);
|
|
goto err_out;
|
|
}
|
|
|
|
/* Validate the format signature */
|
|
|
|
if (dev->rwbuffer[SMART_FMT_POS1] != SMART_FMT_SIG1 ||
|
|
dev->rwbuffer[SMART_FMT_POS2] != SMART_FMT_SIG2 ||
|
|
dev->rwbuffer[SMART_FMT_POS3] != SMART_FMT_SIG3 ||
|
|
dev->rwbuffer[SMART_FMT_POS4] != SMART_FMT_SIG4)
|
|
{
|
|
/* Invalid signature on a sector claiming to be sector 0!
|
|
* What should we do? Release it?*/
|
|
|
|
continue;
|
|
}
|
|
|
|
/* TODO: May want to validate / save the erase block aging info */
|
|
|
|
/* Mark the volume as formatted and set the sector size */
|
|
|
|
dev->formatstatus = SMART_FMT_STAT_FORMATTED;
|
|
dev->namesize = dev->rwbuffer[SMART_FMT_NAMESIZE_POS];
|
|
dev->formatversion = dev->rwbuffer[SMART_FMT_VERSION_POS];
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
dev->rootdirentries = dev->rwbuffer[SMART_FMT_ROOTDIRS_POS];
|
|
|
|
/* If rootdirentries is greater than 1, then we need to register
|
|
* additional block devices.
|
|
*/
|
|
|
|
for (x = 1; x < dev->rootdirentries; x++)
|
|
{
|
|
if (dev->partname != NULL)
|
|
{
|
|
snprintf(dev->rwbuffer, sizeof(devname), "/dev/smart%d%s%d",
|
|
dev->minor, dev->partname, x+1);
|
|
}
|
|
else
|
|
{
|
|
snprintf(devname, sizeof(devname), "/dev/smart%dd%d", dev->minor,
|
|
x + 1);
|
|
}
|
|
|
|
/* Inode private data is a reference to a struct containing
|
|
* the SMART device structure and the root directory number.
|
|
*/
|
|
|
|
rootdirdev = (struct smart_multiroot_device_s*) kmalloc(sizeof(*rootdirdev));
|
|
if (rootdirdev == NULL)
|
|
{
|
|
fdbg("Memory alloc failed\n");
|
|
ret = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
|
|
/* Populate the rootdirdev */
|
|
|
|
rootdirdev->dev = dev;
|
|
rootdirdev->rootdirnum = x;
|
|
ret = register_blockdriver(dev->rwbuffer, &g_bops, 0, rootdirdev);
|
|
|
|
/* Inode private data is a reference to the SMART device structure */
|
|
|
|
ret = register_blockdriver(devname, &g_bops, 0, rootdirdev);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Test for duplicate logical sectors on the device */
|
|
|
|
if (dev->sMap[logicalsector] != 0xFFFF)
|
|
{
|
|
/* Uh-oh, we found more than 1 physical sector claiming to be
|
|
* the * same logical sector. Use the sequence number information
|
|
* to resolve who wins.
|
|
*/
|
|
|
|
uint16_t loser;
|
|
|
|
seq2 = *((uint16_t *) header.seq);
|
|
|
|
/* We must re-read the 1st physical sector to get it's seq number */
|
|
|
|
readaddress = dev->sMap[logicalsector] * dev->mtdBlksPerSector * dev->geo.blocksize;
|
|
ret = MTD_READ(dev->mtd, readaddress, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
goto err_out;
|
|
}
|
|
|
|
seq1 = *((uint16_t *) header.seq);
|
|
|
|
/* Now determine who wins */
|
|
|
|
if (seq1 > 0xFFF0 && seq2 < 10)
|
|
{
|
|
/* Seq 2 is the winner ... we assume it wrapped */
|
|
|
|
loser = dev->sMap[logicalsector];
|
|
dev->sMap[logicalsector] = sector;
|
|
}
|
|
else if (seq2 > seq1)
|
|
{
|
|
/* Seq 2 is bigger, so it's the winner */
|
|
|
|
loser = dev->sMap[logicalsector];
|
|
dev->sMap[logicalsector] = sector;
|
|
}
|
|
else
|
|
{
|
|
/* We keep the original mapping and seq2 is the loser */
|
|
|
|
loser = sector;
|
|
}
|
|
|
|
/* Now release the loser sector */
|
|
|
|
readaddress = loser * dev->mtdBlksPerSector * dev->geo.blocksize;
|
|
ret = MTD_READ(dev->mtd, readaddress, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
goto err_out;
|
|
}
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
header.status &= ~SMART_STATUS_RELEASED;
|
|
#else
|
|
header.status |= SMART_STATUS_RELEASED;
|
|
#endif
|
|
offset = readaddress + offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &header.status);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d releasing duplicate sector\n", -ret);
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
/* Update the logical to physical sector map */
|
|
|
|
dev->sMap[logicalsector] = sector;
|
|
}
|
|
|
|
fdbg("SMART Scan\n");
|
|
fdbg(" Erase size: %10d\n", dev->sectorsPerBlk * dev->sectorsize);
|
|
fdbg(" Erase count: %10d\n", dev->neraseblocks);
|
|
fdbg(" Sect/block: %10d\n", dev->sectorsPerBlk);
|
|
fdbg(" MTD Blk/Sect: %10d\n", dev->mtdBlksPerSector);
|
|
|
|
ret = OK;
|
|
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_getformat
|
|
*
|
|
* Description: Populates the SMART format structure based on the format
|
|
* information for the inode.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
static inline int smart_getformat(struct smart_struct_s *dev,
|
|
struct smart_format_s *fmt,
|
|
uint8_t rootdirnum)
|
|
#else
|
|
static inline int smart_getformat(struct smart_struct_s *dev,
|
|
struct smart_format_s *fmt)
|
|
#endif
|
|
{
|
|
int ret;
|
|
int x;
|
|
|
|
fvdbg("Entry\n");
|
|
DEBUGASSERT(fmt);
|
|
|
|
/* Test if we know the format status or not. If we don't know the
|
|
* status, then we must perform a scan of the device to search
|
|
* for the format marker
|
|
*/
|
|
|
|
if (dev->formatstatus != SMART_FMT_STAT_FORMATTED)
|
|
{
|
|
/* Perform the scan */
|
|
|
|
ret = smart_scan(dev);
|
|
|
|
if (ret != OK)
|
|
{
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
/* Now fill in the structure */
|
|
|
|
if (dev->formatstatus == SMART_FMT_STAT_FORMATTED)
|
|
{
|
|
fmt->flags = SMART_FMT_ISFORMATTED;
|
|
}
|
|
else
|
|
{
|
|
fmt->flags = 0;
|
|
}
|
|
|
|
fmt->sectorsize = dev->sectorsize;
|
|
fmt->availbytes = dev->sectorsize - sizeof(struct smart_sect_header_s);
|
|
fmt->nsectors = dev->neraseblocks * dev->sectorsPerBlk;
|
|
fmt->nfreesectors = dev->freesectors;
|
|
fmt->namesize = dev->namesize;
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
fmt->nrootdirentries = dev->rootdirentries;
|
|
fmt->rootdirnum = rootdirnum;
|
|
#endif
|
|
|
|
/* Add the released sectors to the reported free sector count */
|
|
|
|
for (x = 0; x < dev->neraseblocks; x++)
|
|
{
|
|
fmt->nfreesectors += dev->releasecount[x];
|
|
}
|
|
|
|
/* Subtract the reserved sector count */
|
|
|
|
fmt->nfreesectors -= dev->sectorsPerBlk + 4;
|
|
|
|
ret = OK;
|
|
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_llformat
|
|
*
|
|
* Description: Performs a low-level format of the flash device. This
|
|
* involves erasing the device and writing a valid sector
|
|
* zero (logical) with proper format signature.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
static inline int smart_llformat(struct smart_struct_s *dev, unsigned long arg)
|
|
{
|
|
struct smart_sect_header_s *sectorheader;
|
|
size_t wrcount;
|
|
size_t totalsectors;
|
|
int x;
|
|
int ret;
|
|
uint8_t sectsize;
|
|
|
|
fvdbg("Entry\n");
|
|
|
|
/* Erase the MTD device */
|
|
|
|
ret = MTD_IOCTL(dev->mtd, MTDIOC_BULKERASE, 0);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Now construct a logical sector zero header to write to the device.
|
|
* We fill it with zero so when we add sector aging, all the sector
|
|
* ages will already be initialized to zero without needing special
|
|
* logic to deal with a 0xFF erased-state value.
|
|
*/
|
|
|
|
sectorheader = (struct smart_sect_header_s *) dev->rwbuffer;
|
|
memset(dev->rwbuffer, 0, dev->sectorsize);
|
|
memset(dev->rwbuffer, CONFIG_SMARTFS_ERASEDSTATE, SMARTFS_FMT_AGING_POS);
|
|
*((uint16_t *) sectorheader->seq) = 0;
|
|
|
|
sectsize = (CONFIG_MTD_SMART_SECTOR_SIZE >> 9) << 2;
|
|
#if ( CONFIG_SMARTFS_ERASEDSTATE == 0xFF )
|
|
*((uint16_t *) sectorheader->logicalsector) = 0;
|
|
sectorheader->status = (uint8_t) ~(SMART_STATUS_COMMITTED | SMART_STATUS_VERBITS |
|
|
SMART_STATUS_SIZEBITS) | SMART_STATUS_VERSION |
|
|
sectsize;
|
|
#else
|
|
*((uint16_t *) sectorheader->logicalsector) = 0xFFFF;
|
|
sectorheader->status = (uint8_t) (SMART_STATUS_COMMITTED | SMART_STATUS_VERSION |
|
|
sectsize);
|
|
#endif
|
|
|
|
/* Now add the format signature to the sector */
|
|
|
|
dev->rwbuffer[SMART_FMT_POS1] = SMART_FMT_SIG1;
|
|
dev->rwbuffer[SMART_FMT_POS2] = SMART_FMT_SIG2;
|
|
dev->rwbuffer[SMART_FMT_POS3] = SMART_FMT_SIG3;
|
|
dev->rwbuffer[SMART_FMT_POS4] = SMART_FMT_SIG4;
|
|
|
|
dev->rwbuffer[SMART_FMT_VERSION_POS] = SMART_FMT_VERSION;
|
|
dev->rwbuffer[SMART_FMT_NAMESIZE_POS] = CONFIG_SMARTFS_MAXNAMLEN;
|
|
|
|
/* Record the number of root directory entries we have */
|
|
|
|
dev->rwbuffer[SMART_FMT_ROOTDIRS_POS] = (uint8_t) arg;
|
|
|
|
/* Write the sector to the flash */
|
|
|
|
wrcount = MTD_BWRITE(dev->mtd, 0, dev->mtdBlksPerSector,
|
|
(uint8_t *) dev->rwbuffer);
|
|
if (wrcount != dev->mtdBlksPerSector)
|
|
{
|
|
/* The block is not empty!! What to do? */
|
|
|
|
fdbg("Write block 0 failed: %d.\n", wrcount);
|
|
|
|
/* Unlock the mutex if we add one */
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/* Now initialize our internal control variables */
|
|
|
|
ret = smart_setsectorsize(dev, CONFIG_MTD_SMART_SECTOR_SIZE);
|
|
if (ret != OK)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
dev->formatstatus = SMART_FMT_STAT_UNKNOWN;
|
|
dev->freesectors = dev->neraseblocks * dev->sectorsPerBlk - 1;
|
|
for (x = 0; x < dev->neraseblocks; x++)
|
|
{
|
|
/* Initialize the released and free counts */
|
|
|
|
dev->releasecount[x] = 0;
|
|
dev->freecount[x] = dev->sectorsPerBlk;
|
|
}
|
|
|
|
/* Account for the format sector */
|
|
|
|
dev->freecount[0]--;
|
|
|
|
/* Now initialize the logical to physical sector map */
|
|
|
|
dev->sMap[0] = 0; /* Logical sector zero = physical sector 0 */
|
|
|
|
totalsectors = dev->neraseblocks * dev->sectorsPerBlk;
|
|
for (x = 1; x < totalsectors; x++)
|
|
{
|
|
/* Mark all other logical sectors as non-existant */
|
|
|
|
dev->sMap[x] = -1;
|
|
}
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
|
|
/* Un-register any extra directory device entries */
|
|
|
|
for (x = 2; x < 8; x++)
|
|
{
|
|
snprintf(dev->rwbuffer, 18, "/dev/smart%dd%d", dev->minor, x);
|
|
unregister_blockdriver(dev->rwbuffer);
|
|
}
|
|
#endif
|
|
|
|
return OK;
|
|
}
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
/****************************************************************************
|
|
* Name: smart_findfreephyssector
|
|
*
|
|
* Description: Finds a free physical sector based on free and released
|
|
* count logic, taking into account reserved sectors.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int smart_findfreephyssector(struct smart_struct_s *dev)
|
|
{
|
|
uint16_t allocfreecount;
|
|
uint16_t allocblock;
|
|
uint16_t physicalsector;
|
|
uint16_t x;
|
|
uint32_t readaddr;
|
|
struct smart_sect_header_s header;
|
|
int ret;
|
|
|
|
/* Determine which erase block we should allocate the new
|
|
* sector from. This is based on the number of free sectors
|
|
* available in each erase block. */
|
|
|
|
allocfreecount = 0;
|
|
allocblock = 0xFFFF;
|
|
physicalsector = 0xFFFF;
|
|
for (x = 0; x < dev->neraseblocks; x++)
|
|
{
|
|
/* Test if this block has more free blocks than the
|
|
* currently selected block */
|
|
|
|
if (dev->freecount[x] > allocfreecount)
|
|
{
|
|
/* Assign this block to alloc from */
|
|
|
|
allocblock = x;
|
|
allocfreecount = dev->freecount[x];
|
|
}
|
|
}
|
|
|
|
/* Check if we found an allocblock. */
|
|
|
|
if (allocblock == 0xFFFF)
|
|
{
|
|
/* No free sectors found! Bug? */
|
|
return -EIO;
|
|
}
|
|
|
|
/* Now find a free physical sector within this selected
|
|
* erase block to allocate. */
|
|
|
|
for (x = allocblock * dev->sectorsPerBlk;
|
|
x < (allocblock+1) * dev->sectorsPerBlk; x++)
|
|
{
|
|
/* Check if this physical sector is available */
|
|
|
|
readaddr = x * dev->mtdBlksPerSector * dev->geo.blocksize;
|
|
ret = MTD_READ(dev->mtd, readaddr, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
fvdbg("Error reading phys sector %d\n", physicalsector);
|
|
return -EIO;
|
|
}
|
|
|
|
if ((*((uint16_t *) header.logicalsector) == 0xFFFF) &&
|
|
(*((uint16_t *) header.seq) == 0xFFFF) &&
|
|
((header.status & SMART_STATUS_COMMITTED) ==
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_COMMITTED)))
|
|
{
|
|
physicalsector = x;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return physicalsector;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_garbagecollect
|
|
*
|
|
* Description: Performs garbage collection if needed. This is determined
|
|
* by the count of released sectors relative to free and
|
|
* total sectors.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
static int smart_garbagecollect(struct smart_struct_s *dev)
|
|
{
|
|
uint16_t releasedsectors;
|
|
uint16_t collectblock;
|
|
uint16_t releasemax;
|
|
uint16_t newsector;
|
|
bool collect = TRUE;
|
|
int x;
|
|
int ret;
|
|
size_t offset;
|
|
struct smart_sect_header_s *header;
|
|
uint8_t newstatus;
|
|
|
|
while (collect)
|
|
{
|
|
collect = FALSE;
|
|
|
|
/* Calculate the number of released sectors on the device */
|
|
|
|
releasedsectors = 0;
|
|
collectblock = 0xFFFF;
|
|
releasemax = 0;
|
|
for (x = 0; x < dev->neraseblocks; x++)
|
|
{
|
|
releasedsectors += dev->releasecount[x];
|
|
if (dev->releasecount[x] > releasemax)
|
|
{
|
|
releasemax = dev->releasecount[x];
|
|
collectblock = x;
|
|
}
|
|
}
|
|
|
|
/* Test if the released sectors count is greater than the
|
|
* free sectors. If it is, then we will do garbage collection.
|
|
*/
|
|
|
|
if (releasedsectors > dev->freesectors)
|
|
collect = TRUE;
|
|
|
|
/* Test if we have more reached our reserved free sector limit */
|
|
|
|
if (dev->freesectors <= (dev->sectorsPerBlk << 0) + 4)
|
|
collect = TRUE;
|
|
|
|
/* Test if we need to garbage collect */
|
|
|
|
if (collect)
|
|
{
|
|
if (collectblock == 0xFFFF)
|
|
{
|
|
/* Need to collect, but no sectors with released blocks! */
|
|
|
|
ret = -ENOSPC;
|
|
goto errout;
|
|
}
|
|
|
|
fdbg("Collecting block %d, free=%d released=%d\n",
|
|
collectblock, dev->freecount[collectblock],
|
|
dev->releasecount[collectblock]);
|
|
|
|
if (dev->freecount[collectblock] == 6)
|
|
{
|
|
fdbg("here!\n");
|
|
}
|
|
|
|
/* Perform collection on block with the most released sectors.
|
|
* First mark the block as having no free sectors so we don't
|
|
* try to move sectors into the block we are trying to erase.
|
|
*/
|
|
|
|
dev->freecount[collectblock] = 0;
|
|
|
|
/* Next move all live data in the block to a new home. */
|
|
|
|
for (x = collectblock * dev->sectorsPerBlk; x <
|
|
(collectblock + 1) * dev->sectorsPerBlk; x++)
|
|
{
|
|
/* Read the next sector from this erase block */
|
|
|
|
ret = MTD_BREAD(dev->mtd, x * dev->mtdBlksPerSector,
|
|
dev->mtdBlksPerSector, (uint8_t *) dev->rwbuffer);
|
|
if (ret != dev->mtdBlksPerSector)
|
|
{
|
|
fdbg("Error reading sector %d\n", x);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Test if if the block is in use */
|
|
|
|
header = (struct smart_sect_header_s *) dev->rwbuffer;
|
|
if (((header->status & SMART_STATUS_COMMITTED) ==
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_COMMITTED)) ||
|
|
((header->status & SMART_STATUS_RELEASED) !=
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_RELEASED)))
|
|
{
|
|
/* This sector doesn't have live data (free or released).
|
|
* just continue to the next sector and don't move it.
|
|
*/
|
|
|
|
continue;
|
|
}
|
|
|
|
/* Find a new sector where it can live, NOT in this erase block */
|
|
|
|
newsector = smart_findfreephyssector(dev);
|
|
if (newsector == 0xFFFF)
|
|
{
|
|
/* Unable to find a free sector!!! */
|
|
|
|
fdbg("Can't find a free sector for relocation\n");
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Increment the sequence number and clear the "commit" flag */
|
|
|
|
(*((uint16_t *) header->seq))++;
|
|
if (*((uint16_t *) header->seq) == 0xFFFF)
|
|
{
|
|
*((uint16_t *) header->seq) = 1;
|
|
}
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
header->status |= SMART_STATUS_COMMITTED;
|
|
#else
|
|
header->status &= ~SMART_STATUS_COMMITTED;
|
|
#endif
|
|
|
|
/* Write the data to the new physical sector location */
|
|
|
|
ret = MTD_BWRITE(dev->mtd, newsector * dev->mtdBlksPerSector,
|
|
dev->mtdBlksPerSector, (uint8_t *) dev->rwbuffer);
|
|
|
|
/* Commit the sector */
|
|
|
|
offset = newsector * dev->mtdBlksPerSector * dev->geo.blocksize +
|
|
offsetof(struct smart_sect_header_s, status);
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
newstatus = header->status & ~SMART_STATUS_COMMITTED;
|
|
#else
|
|
newstatus = header->status | SMART_STATUS_COMMITTED;
|
|
#endif
|
|
ret = smart_bytewrite(dev, offset, 1, &newstatus);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d committing new sector %d\n" -ret, newsector);
|
|
goto errout;
|
|
}
|
|
|
|
/* Release the old physical sector */
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
newstatus = header->status & ~SMART_STATUS_RELEASED;
|
|
#else
|
|
newstatus = header->status | SMART_STATUS_RELEASED;
|
|
#endif
|
|
offset = x * dev->mtdBlksPerSector * dev->geo.blocksize +
|
|
offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &newstatus);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d releasing old sector %d\n" -ret, x);
|
|
goto errout;
|
|
}
|
|
|
|
/* Update the variables */
|
|
|
|
dev->sMap[*((uint16_t *) header->logicalsector)] = newsector;
|
|
dev->freecount[newsector / dev->sectorsPerBlk]--;
|
|
}
|
|
|
|
/* Now erase the erase block */
|
|
|
|
MTD_ERASE(dev->mtd, collectblock, 1);
|
|
|
|
dev->freesectors += dev->releasecount[collectblock];
|
|
dev->freecount[collectblock] = dev->sectorsPerBlk;
|
|
dev->releasecount[collectblock] = 0;
|
|
|
|
/* If this is block zero, then be sure to write the sector size */
|
|
|
|
if (collectblock == 0)
|
|
{
|
|
/* Set the sector size in the 1st header */
|
|
|
|
uint8_t sectsize = dev->sectorsize >> 7;
|
|
#if ( CONFIG_SMARTFS_ERASEDSTATE == 0xFF )
|
|
newstatus = (uint8_t) ~SMART_STATUS_SIZEBITS | sectsize;
|
|
#else
|
|
newstatus = (uint8_t) sectsize;
|
|
#endif
|
|
/* Write the sector size to the device */
|
|
|
|
offset = offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &newstatus);
|
|
if (ret < 0)
|
|
{
|
|
fdbg("Error %d setting sector 0 size\n", -ret);
|
|
}
|
|
}
|
|
|
|
/* Update the block aging information in the format signature sector */
|
|
}
|
|
else
|
|
{
|
|
/* Test for aging sectors and push them to a new location
|
|
* so we wear evenly.
|
|
*/
|
|
}
|
|
}
|
|
|
|
return OK;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
/****************************************************************************
|
|
* Name: smart_writesector
|
|
*
|
|
* Description: Writes data to the specified logical sector. The sector
|
|
* should have already been allocated prior to the write. If
|
|
* the logical sector already has data on the device, it will
|
|
* be released and a new physical sector will be created and
|
|
* mapped to the logical sector.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
static inline int smart_writesector(struct smart_struct_s *dev, unsigned long arg)
|
|
{
|
|
int ret;
|
|
uint16_t x;
|
|
bool needsrelocate = FALSE;
|
|
uint16_t mtdblock;
|
|
uint16_t physsector;
|
|
struct smart_read_write_s *req;
|
|
struct smart_sect_header_s *header;
|
|
size_t offset;
|
|
uint8_t byte;
|
|
|
|
fvdbg("Entry\n");
|
|
req = (struct smart_read_write_s *) arg;
|
|
DEBUGASSERT(req->offset <= dev->sectorsize);
|
|
DEBUGASSERT(req->offset+req->count <= dev->sectorsize);
|
|
|
|
/* Ensure the logical sector has been allocated */
|
|
|
|
if (req->logsector >= dev->totalsectors)
|
|
{
|
|
fdbg("Logical sector %d too large\n", req->logsector);
|
|
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
physsector = dev->sMap[req->logsector];
|
|
if (physsector == 0xFFFF)
|
|
{
|
|
fdbg("Logical sector %d not allocated\n", req->logsector);
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
/* Read the sector data into our buffer */
|
|
|
|
mtdblock = physsector * dev->mtdBlksPerSector;
|
|
ret = MTD_BREAD(dev->mtd, mtdblock, dev->mtdBlksPerSector, (uint8_t *)
|
|
dev->rwbuffer);
|
|
if (ret != dev->mtdBlksPerSector)
|
|
{
|
|
fdbg("Error reading phys sector %d\n", physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Test if we need to relocate the sector to perform the write */
|
|
|
|
for (x = 0; x < req->count; x++)
|
|
{
|
|
/* Test if the next byte can be written to the flash */
|
|
|
|
byte = dev->rwbuffer[sizeof(struct smart_sect_header_s) + req->offset + x];
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
if (((byte ^ req->buffer[x]) | byte) != byte)
|
|
{
|
|
needsrelocate = TRUE;
|
|
break;
|
|
}
|
|
#else
|
|
if (((byte ^ req->buffer[x]) | req->buffer[x]) != req->buffer[x])
|
|
{
|
|
needsrelocate = TRUE;
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (needsrelocate)
|
|
{
|
|
/* Find a new physical sector to save data to */
|
|
|
|
physsector = smart_findfreephyssector(dev);
|
|
if (physsector == 0xFFFF)
|
|
{
|
|
fdbg("Error relocating sector %d\n", req->logsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Update the sequence number to indicate the sector was moved */
|
|
|
|
header = (struct smart_sect_header_s *) dev->rwbuffer;
|
|
(*((uint16_t *) header->seq))++;
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
header->status |= SMART_STATUS_COMMITTED;
|
|
#else
|
|
header->status &= SMART_STATUS_COMMITTED;
|
|
#endif
|
|
}
|
|
|
|
/* Now copy the data to the sector buffer. */
|
|
|
|
memcpy(&dev->rwbuffer[sizeof(struct smart_sect_header_s) + req->offset],
|
|
req->buffer, req->count);
|
|
|
|
/* Now write the sector buffer to the device. */
|
|
|
|
if (needsrelocate)
|
|
{
|
|
/* Write the entire sector to the new physical location, uncommitted. */
|
|
|
|
ret = MTD_BWRITE(dev->mtd, physsector * dev->mtdBlksPerSector,
|
|
dev->mtdBlksPerSector, (uint8_t *) dev->rwbuffer);
|
|
if (ret != dev->mtdBlksPerSector)
|
|
{
|
|
fdbg("Error writing to physical sector %d\n", physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Commit the new physical sector */
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
byte = header->status & ~SMART_STATUS_COMMITTED;
|
|
#else
|
|
byte = header->status | SMART_STATUS_COMMITTED;
|
|
#endif
|
|
offset = physsector * dev->mtdBlksPerSector * dev->geo.blocksize +
|
|
offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &byte);
|
|
if (ret != 1)
|
|
{
|
|
fvdbg("Error committing physical sector %d\n", physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Release the old physical sector */
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
byte = header->status & ~SMART_STATUS_RELEASED;
|
|
#else
|
|
byte = header->status | SMART_STATUS_RELEASED;
|
|
#endif
|
|
offset = mtdblock * dev->geo.blocksize +
|
|
offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &byte);
|
|
|
|
/* Update releasecount for released sector and freecount for the
|
|
* newly allocated physical sector. */
|
|
|
|
dev->releasecount[dev->sMap[req->logsector] / dev->sectorsPerBlk]++;
|
|
dev->freecount[physsector / dev->sectorsPerBlk]--;
|
|
dev->freesectors--;
|
|
|
|
/* Update the sector map */
|
|
|
|
dev->sMap[req->logsector] = physsector;
|
|
|
|
/* Since we performed a relocation, do garbage collection to
|
|
* ensure we don't fill up our flash with released blocks.
|
|
*/
|
|
|
|
smart_garbagecollect(dev);
|
|
}
|
|
else
|
|
{
|
|
/* Not relocated. Just write the portion of the sector that needs
|
|
* to be written. */
|
|
|
|
offset = mtdblock * dev->geo.blocksize +
|
|
sizeof(struct smart_sect_header_s) + req->offset;
|
|
ret = smart_bytewrite(dev, offset, req->count, req->buffer);
|
|
}
|
|
|
|
ret = OK;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
/****************************************************************************
|
|
* Name: smart_readsector
|
|
*
|
|
* Description: Reads data from the specified logical sector. The sector
|
|
* should have already been allocated prior to the read.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline int smart_readsector(struct smart_struct_s *dev, unsigned long arg)
|
|
{
|
|
int ret;
|
|
uint32_t readaddr;
|
|
uint16_t physsector;
|
|
struct smart_read_write_s *req;
|
|
struct smart_sect_header_s header;
|
|
|
|
fvdbg("Entry\n");
|
|
req = (struct smart_read_write_s *) arg;
|
|
DEBUGASSERT(req->offset < dev->sectorsize);
|
|
DEBUGASSERT(req->offset+req->count < dev->sectorsize);
|
|
|
|
/* Ensure the logical sector has been allocated */
|
|
|
|
if (req->logsector >= dev->totalsectors)
|
|
{
|
|
fdbg("Logical sector %d too large\n", req->logsector);
|
|
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
physsector = dev->sMap[req->logsector];
|
|
if (physsector == 0xFFFF)
|
|
{
|
|
fdbg("Logical sector %d not allocated\n", req->logsector);
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
/* Read the sector header data to validate as a sanity check */
|
|
|
|
ret = MTD_READ(dev->mtd, physsector * dev->mtdBlksPerSector * dev->geo.blocksize,
|
|
sizeof(struct smart_sect_header_s), (uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
fvdbg("Error reading sector %d header\n", physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Do a sanity check on the header data */
|
|
|
|
if (((*(uint16_t *) header.logicalsector) != req->logsector) ||
|
|
((header.status & SMART_STATUS_COMMITTED) ==
|
|
(CONFIG_SMARTFS_ERASEDSTATE & SMART_STATUS_COMMITTED)))
|
|
{
|
|
/* Error in sector header! How do we handle this? */
|
|
|
|
fdbg("Error in logical sector %d header, phys=%d\n",
|
|
req->logsector, physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
/* Read the sector data into the buffer */
|
|
|
|
readaddr = (uint32_t) physsector * dev->mtdBlksPerSector * dev->geo.blocksize +
|
|
req->offset + sizeof(struct smart_sect_header_s);;
|
|
|
|
ret = MTD_READ(dev->mtd, readaddr, req->count, (uint8_t *)
|
|
req->buffer);
|
|
if (ret != req->count)
|
|
{
|
|
fdbg("Error reading phys sector %d\n", physsector);
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: smart_allocsector
|
|
*
|
|
* Description: Allocates a new logical sector. If an argument is given,
|
|
* then it tries to allocate the specified sector number.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
static inline int smart_allocsector(struct smart_struct_s *dev, unsigned long requested)
|
|
{
|
|
int x;
|
|
int ret;
|
|
uint16_t logsector = 0xFFFF; /* Logical sector number selected */
|
|
uint16_t physicalsector; /* The selected physical sector */
|
|
uint16_t releasecount;
|
|
struct smart_sect_header_s *header;
|
|
uint8_t sectsize;
|
|
|
|
/* Validate that we have enough sectors available to perform an
|
|
* allocation. We have to ensure we keep enough reserved sectors
|
|
* on hand to do released sector garbage collection. */
|
|
|
|
releasecount = 0;
|
|
for (x = 0; x < dev->neraseblocks; x++)
|
|
{
|
|
releasecount += dev->releasecount[x];
|
|
}
|
|
|
|
if (dev->freesectors <= (dev->sectorsPerBlk << 0) + 4)
|
|
{
|
|
/* We are at our free sector limit. Test if we have
|
|
* sectors we can release */
|
|
|
|
if (releasecount == 0)
|
|
{
|
|
/* No space left!! */
|
|
|
|
return -ENOSPC;
|
|
}
|
|
}
|
|
|
|
/* Check if a specific sector is being requested and allocate that
|
|
* sector if it isn't already in use */
|
|
|
|
if ((requested > 2) && (requested < dev->totalsectors))
|
|
{
|
|
/* Validate the sector is not already allocated */
|
|
|
|
if (dev->sMap[requested] == (uint16_t) -1)
|
|
{
|
|
logsector = requested;
|
|
}
|
|
}
|
|
|
|
/* Check if we need to scan for an available logical sector */
|
|
|
|
if (logsector == 0xFFFF)
|
|
{
|
|
/* Loop through all sectors and find one to allocate */
|
|
|
|
for (x = SMART_FIRST_ALLOC_SECTOR; x < dev->totalsectors; x++)
|
|
{
|
|
if (dev->sMap[x] == (uint16_t) -1)
|
|
{
|
|
/* Unused logical sector found. Use this one */
|
|
|
|
logsector = x;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Test for an error allocating a sector */
|
|
|
|
if (logsector == 0xFFFF)
|
|
{
|
|
/* Hmmm. We think we had enough logical sectors, but
|
|
* something happened and we didn't find any free
|
|
* logical sectors. What do do? Report an error?
|
|
* rescan and try again to "self heal" in case of a
|
|
* bug in our code? */
|
|
|
|
fdbg("No free logical sector numbers! Free sectors = %d\n",
|
|
dev->freesectors);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/* Check if we need to do garbage collection. We have to
|
|
* ensure we keep enough reserved free sectors to per garbage
|
|
* collection as it involves moving sectors from blocks with
|
|
* released sectors into blocks with free sectors, then
|
|
* erasing the vacated block. */
|
|
|
|
smart_garbagecollect(dev);
|
|
|
|
/* Find a free physical sector */
|
|
|
|
physicalsector = smart_findfreephyssector(dev);
|
|
fvdbg("Alloc: log=%d, phys=%d, erase block=%d, free=%d, released=%d\n",
|
|
logsector, physicalsector, physicalsector /
|
|
dev->sectorsPerBlk, dev->freesectors, releasecount);
|
|
|
|
/* Create a header to assign the logical sector */
|
|
|
|
memset(dev->rwbuffer, CONFIG_SMARTFS_ERASEDSTATE, dev->sectorsize);
|
|
header = (struct smart_sect_header_s *) dev->rwbuffer;
|
|
*((uint16_t *) header->logicalsector) = logsector;
|
|
*((uint16_t *) header->seq) = 0;
|
|
sectsize = dev->sectorsize >> 7;
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
header->status = ~(SMART_STATUS_COMMITTED | SMART_STATUS_SIZEBITS |
|
|
SMART_STATUS_VERBITS) | SMART_STATUS_VERSION | sectsize;
|
|
#else
|
|
header->status = SMART_STATUS_COMMITTED | SMART_STATUS_VERSION | sectsize;
|
|
#endif
|
|
|
|
/* Write the header to the physical sector location */
|
|
|
|
x = physicalsector * dev->mtdBlksPerSector;
|
|
|
|
fvdbg("Write MTD block %d\n", x);
|
|
ret = MTD_BWRITE(dev->mtd, x, 1, (uint8_t *) dev->rwbuffer);
|
|
if (ret != 1)
|
|
{
|
|
/* The block is not empty!! What to do? */
|
|
|
|
fdbg("Write block %d failed: %d.\n", x, ret);
|
|
|
|
/* Unlock the mutex if we add one */
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/* Map the sector and update the free sector counts */
|
|
|
|
dev->sMap[logsector] = physicalsector;
|
|
dev->freecount[physicalsector / dev->sectorsPerBlk]--;
|
|
dev->freesectors--;
|
|
|
|
/* Return the logical sector number */
|
|
|
|
return logsector;
|
|
}
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
/****************************************************************************
|
|
* Name: smart_freesector
|
|
*
|
|
* Description: Frees a logical sector from the device. Freeing (also
|
|
* called releasing) is performed by programming the released
|
|
* bit in the sector header's status byte.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
static inline int smart_freesector(struct smart_struct_s *dev, unsigned long
|
|
logicalsector)
|
|
{
|
|
int ret;
|
|
int readaddr;
|
|
uint16_t physsector;
|
|
uint16_t block;
|
|
struct smart_sect_header_s header;
|
|
size_t offset;
|
|
|
|
/* Check if the logical sector is within bounds */
|
|
|
|
if ((logicalsector > 2) && (logicalsector < dev->totalsectors))
|
|
{
|
|
/* Validate the sector is actually allocated */
|
|
|
|
if (dev->sMap[logicalsector] == (uint16_t) -1)
|
|
{
|
|
fdbg("Invalid release - sector %d not allocated\n", logicalsector);
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* Okay to release the sector. Read the sector header info */
|
|
|
|
physsector = dev->sMap[logicalsector];
|
|
readaddr = physsector * dev->mtdBlksPerSector * dev->geo.blocksize;
|
|
ret = MTD_READ(dev->mtd, readaddr, sizeof(struct smart_sect_header_s),
|
|
(uint8_t *) &header);
|
|
if (ret != sizeof(struct smart_sect_header_s))
|
|
{
|
|
goto errout;
|
|
}
|
|
|
|
/* Do a sanity check on the logical sector number */
|
|
|
|
if (*((uint16_t *) header.logicalsector) != (uint16_t) logicalsector)
|
|
{
|
|
/* Hmmm... something is wrong. This should always match! Bug in our code? */
|
|
|
|
fdbg("Sector %d logical sector in header doesn't match\n", logicalsector);
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
/* Mark the sector as released */
|
|
|
|
#if CONFIG_SMARTFS_ERASEDSTATE == 0xFF
|
|
header.status &= ~SMART_STATUS_RELEASED;
|
|
#else
|
|
header.status |= SMART_STATUS_RELEASED;
|
|
#endif
|
|
|
|
/* Write the status back to the device */
|
|
|
|
offset = readaddr + offsetof(struct smart_sect_header_s, status);
|
|
ret = smart_bytewrite(dev, offset, 1, &header.status);
|
|
if (ret != 1)
|
|
{
|
|
fdbg("Error updating physicl sector %d status\n", physsector);
|
|
goto errout;
|
|
}
|
|
|
|
/* Update the erase block's release count */
|
|
|
|
block = physsector / dev->sectorsPerBlk;
|
|
dev->releasecount[block]++;
|
|
|
|
/* Unmap this logical sector */
|
|
|
|
dev->sMap[logicalsector] = (uint16_t) -1;
|
|
|
|
/* If this block has only released blocks, then erase it */
|
|
|
|
if (dev->releasecount[block] + dev->freecount[block] == dev->sectorsPerBlk)
|
|
{
|
|
/* Erase the block */
|
|
|
|
MTD_ERASE(dev->mtd, block, 1);
|
|
|
|
dev->freesectors += dev->releasecount[block];
|
|
dev->releasecount[block] = 0;
|
|
dev->freecount[block] = dev->sectorsPerBlk;
|
|
}
|
|
|
|
ret = OK;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
/****************************************************************************
|
|
* Name: smart_ioctl
|
|
*
|
|
* Description: Return device geometry
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int smart_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
|
|
{
|
|
struct smart_struct_s *dev ;
|
|
int ret;
|
|
|
|
fvdbg("Entry\n");
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
dev = ((struct smart_multiroot_device_s*) inode->i_private)->dev;
|
|
#else
|
|
dev = (struct smart_struct_s *)inode->i_private;
|
|
#endif
|
|
|
|
/* Process the ioctl's we care about first, pass any we don't respond
|
|
* to directly to the underlying MTD device.
|
|
*/
|
|
|
|
switch (cmd)
|
|
{
|
|
case 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
|
|
if (arg == 0)
|
|
{
|
|
fdbg("ERROR: BIOC_XIPBASE argument is NULL\n");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/* Just change the BIOC_XIPBASE command to the MTDIOC_XIPBASE command. */
|
|
|
|
cmd = MTDIOC_XIPBASE;
|
|
break;
|
|
|
|
case BIOC_GETFORMAT:
|
|
|
|
/* Return the format information for the device */
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
ret = smart_getformat(dev, (struct smart_format_s *) arg,
|
|
((struct smart_multiroot_device_s*) inode->i_private)->rootdirnum);
|
|
#else
|
|
ret = smart_getformat(dev, (struct smart_format_s *) arg);
|
|
#endif
|
|
goto ok_out;
|
|
|
|
case BIOC_READSECT:
|
|
|
|
/* Do a logical sector read and return the data */
|
|
ret = smart_readsector(dev, arg);
|
|
goto ok_out;
|
|
|
|
#ifdef CONFIG_FS_WRITABLE
|
|
case BIOC_LLFORMAT:
|
|
|
|
/* Perform a low-level format on the flash */
|
|
|
|
ret = smart_llformat(dev, arg);
|
|
goto ok_out;
|
|
|
|
case BIOC_ALLOCSECT:
|
|
|
|
/* Allocate a logical sector for the upper layer file system */
|
|
|
|
ret = smart_allocsector(dev, arg);
|
|
goto ok_out;
|
|
|
|
case BIOC_FREESECT:
|
|
|
|
/* Free the specified logical sector */
|
|
|
|
ret = smart_freesector(dev, arg);
|
|
goto ok_out;
|
|
|
|
case BIOC_WRITESECT:
|
|
|
|
/* Write to the sector */
|
|
|
|
ret = smart_writesector(dev, arg);
|
|
goto ok_out;
|
|
#endif /* CONFIG_FS_WRITABLE */
|
|
|
|
}
|
|
|
|
/* No other block driver ioctl commmands 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)
|
|
{
|
|
fdbg("ERROR: MTD ioctl(%04x) failed: %d\n", cmd, ret);
|
|
}
|
|
|
|
ok_out:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: smart_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/smartN where N is the minor number.
|
|
* mtd - The MTD device that supports the FLASH interface.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int smart_initialize(int minor, FAR struct mtd_dev_s *mtd, const char *partname)
|
|
{
|
|
struct smart_struct_s *dev;
|
|
int ret = -ENOMEM;
|
|
uint32_t totalsectors;
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
struct smart_multiroot_device_s *rootdirdev;
|
|
#endif
|
|
|
|
/* Sanity check */
|
|
|
|
#ifdef CONFIG_DEBUG
|
|
if (minor < 0 || minor > 255 || !mtd)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/* Allocate a SMART device structure */
|
|
|
|
dev = (struct smart_struct_s *)kmalloc(sizeof(struct smart_struct_s));
|
|
if (dev)
|
|
{
|
|
/* Initialize the SMART 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).
|
|
*/
|
|
|
|
/* Set these to zero in case the device doesn't support them */
|
|
|
|
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY, (unsigned long)((uintptr_t)&dev->geo));
|
|
if (ret < 0)
|
|
{
|
|
fdbg("MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", ret);
|
|
kfree(dev);
|
|
goto errout;
|
|
}
|
|
|
|
/* Set the sector size to the default for now */
|
|
|
|
dev->sMap = NULL;
|
|
dev->rwbuffer = NULL;
|
|
ret = smart_setsectorsize(dev, CONFIG_MTD_SMART_SECTOR_SIZE);
|
|
if (ret != OK)
|
|
{
|
|
kfree(dev);
|
|
goto errout;
|
|
}
|
|
|
|
/* Calculate the totalsectors on this device and validate */
|
|
|
|
totalsectors = dev->neraseblocks * dev->sectorsPerBlk;
|
|
if (totalsectors > 65534)
|
|
{
|
|
fdbg("SMART Sector size too small for device\n");
|
|
kfree(dev);
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
dev->freesectors = (uint16_t) totalsectors;
|
|
|
|
/* Mark the device format status an unknown */
|
|
|
|
dev->formatstatus = SMART_FMT_STAT_UNKNOWN;
|
|
dev->namesize = CONFIG_SMARTFS_MAXNAMLEN;
|
|
dev->partname = partname;
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
dev->minor = minor;
|
|
#endif
|
|
|
|
/* Create a MTD block device name */
|
|
|
|
#ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
|
|
if (partname != NULL)
|
|
snprintf(dev->rwbuffer, 18, "/dev/smart%d%sd1", minor, partname);
|
|
else
|
|
snprintf(dev->rwbuffer, 18, "/dev/smart%dd1", minor);
|
|
|
|
/* Inode private data is a reference to a struct containing
|
|
* the SMART device structure and the root directory number.
|
|
*/
|
|
|
|
rootdirdev = (struct smart_multiroot_device_s*) kmalloc(sizeof(*rootdirdev));
|
|
if (rootdirdev == NULL)
|
|
{
|
|
fdbg("register_blockdriver failed: %d\n", -ret);
|
|
kfree(dev->sMap);
|
|
kfree(dev->rwbuffer);
|
|
kfree(dev);
|
|
ret = -ENOMEM;
|
|
goto errout;
|
|
}
|
|
|
|
/* Populate the rootdirdev */
|
|
|
|
rootdirdev->dev = dev;
|
|
rootdirdev->rootdirnum = 0;
|
|
ret = register_blockdriver(dev->rwbuffer, &g_bops, 0, rootdirdev);
|
|
|
|
#else
|
|
if (partname != NULL)
|
|
snprintf(dev->rwbuffer, 18, "/dev/smart%d%s", minor, partname);
|
|
else
|
|
snprintf(dev->rwbuffer, 18, "/dev/smart%d", minor);
|
|
|
|
/* Inode private data is a reference to the SMART device structure */
|
|
|
|
ret = register_blockdriver(dev->rwbuffer, &g_bops, 0, dev);
|
|
#endif
|
|
|
|
if (ret < 0)
|
|
{
|
|
fdbg("register_blockdriver failed: %d\n", -ret);
|
|
kfree(dev->sMap);
|
|
kfree(dev->rwbuffer);
|
|
kfree(dev);
|
|
goto errout;
|
|
}
|
|
|
|
/* Do a scan of the device */
|
|
|
|
smart_scan(dev);
|
|
}
|
|
|
|
errout:
|
|
return ret;
|
|
}
|