linux-imx

/*

 * Linux driver for NAND Flash Translation Layer

 *

 * Copyright © 1999 Machine Vision Holdings, Inc.

 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

​

#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 10000

​

​

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

{

    struct NFTLrecord *nftl;

    unsigned long temp;

​

    if (!mtd_type_is_nand(mtd) || mtd->size > UINT_MAX)

        return;

    /* OK, this is moderately ugly.  But probably safe.  Alternatives? */

    if (memcmp(mtd->name, "DiskOnChip", 10))

        return;

​

    pr_debug("NFTL: add_mtd for %s\n", mtd->name);

​

    nftl = kzalloc(sizeof(struct NFTLrecord), GFP_KERNEL);

​

    if (!nftl)

        return;

​

    nftl->mbd.mtd = mtd;

    nftl->mbd.devnum = -1;

​

    nftl->mbd.tr = tr;

​

        if (NFTL_mount(nftl) < 0) {

        printk(KERN_WARNING "NFTL: could not mount device\n");

        kfree(nftl);

        return;

        }

​

    /* OK, it's a new one. Set up all the data structures. */

​

    /* Calculate geometry */

    nftl->cylinders = 1024;

    nftl->heads = 16;

​

    temp = nftl->cylinders * nftl->heads;

    nftl->sectors = nftl->mbd.size / temp;

    if (nftl->mbd.size % temp) {

        nftl->sectors++;

        temp = nftl->cylinders * nftl->sectors;

        nftl->heads = nftl->mbd.size / temp;

​

        if (nftl->mbd.size % temp) {

            nftl->heads++;

            temp = nftl->heads * nftl->sectors;