linux/drivers/mtd/nftlcore.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Linux driver for NAND Flash Translation Layer
 *
 * Copyright © 1999 Machine Vision Holdings, Inc.
 * Copyright © 1999-2010 David Woodhouse <[email protected]>
 */

#define PRERELEASE

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/hdreg.h>
#include <linux/blkdev.h>

#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/nftl.h>
#include <linux/mtd/blktrans.h>

/* maximum number of loops while examining next block, to have a
   chance to detect consistency problems (they should never happen
   because of the checks done in the mounting */

#define MAX_LOOPS …


static void nftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
{ … }

static void nftl_remove_dev(struct mtd_blktrans_dev *dev)
{ … }

/*
 * Read oob data from flash
 */
int nftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
		  size_t *retlen, uint8_t *buf)
{ … }

/*
 * Write oob data to flash
 */
int nftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
		   size_t *retlen, uint8_t *buf)
{ … }

#ifdef CONFIG_NFTL_RW

/*
 * Write data and oob to flash
 */
static int nftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
		      size_t *retlen, uint8_t *buf, uint8_t *oob)
{ … }

/* Actual NFTL access routines */
/* NFTL_findfreeblock: Find a free Erase Unit on the NFTL partition. This function is used
 *	when the give Virtual Unit Chain
 */
static u16 NFTL_findfreeblock(struct NFTLrecord *nftl, int desperate )
{ … }

static u16 NFTL_foldchain (struct NFTLrecord *nftl, unsigned thisVUC, unsigned pendingblock )
{ … }

static u16 NFTL_makefreeblock( struct NFTLrecord *nftl , unsigned pendingblock)
{ … }

/* NFTL_findwriteunit: Return the unit number into which we can write
                       for this block. Make it available if it isn't already
*/
static inline u16 NFTL_findwriteunit(struct NFTLrecord *nftl, unsigned block)
{ … }

static int nftl_writeblock(struct mtd_blktrans_dev *mbd, unsigned long block,
			   char *buffer)
{ … }
#endif /* CONFIG_NFTL_RW */

static int nftl_readblock(struct mtd_blktrans_dev *mbd, unsigned long block,
			  char *buffer)
{ … }

static int nftl_getgeo(struct mtd_blktrans_dev *dev,  struct hd_geometry *geo)
{ … }

/****************************************************************************
 *
 * Module stuff
 *
 ****************************************************************************/


static struct mtd_blktrans_ops nftl_tr = …;

module_mtd_blktrans(…);

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_ALIAS_BLOCKDEV_MAJOR(…);