linux-imx

/*

 * inftlcore.c -- Linux driver for Inverse Flash Translation Layer (INFTL)

 *

 * Copyright © 2002, Greg Ungerer (gerg@snapgear.com)

 *

 * Based heavily on the nftlcore.c code which is:

 * Copyright © 1999 Machine Vision Holdings, Inc.

 * Copyright © 1999 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

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/sched.h>

#include <linux/init.h>

#include <linux/kmod.h>

#include <linux/hdreg.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/nftl.h>

#include <linux/mtd/inftl.h>

#include <linux/mtd/rawnand.h>

#include <linux/uaccess.h>

#include <asm/errno.h>

#include <asm/io.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 inftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)

{

    struct INFTLrecord *inftl;

    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;

​

    if (!mtd->_block_isbad) {

        printk(KERN_ERR

"INFTL no longer supports the old DiskOnChip drivers loaded via docprobe.\n"

"Please use the new diskonchip driver under the NAND subsystem.\n");

        return;

    }

​

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

​

    inftl = kzalloc(sizeof(*inftl), GFP_KERNEL);

​

    if (!inftl)

        return;

​

    inftl->mbd.mtd = mtd;

    inftl->mbd.devnum = -1;

​

    inftl->mbd.tr = tr;

​

    if (INFTL_mount(inftl) < 0) {

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

        kfree(inftl);

        return;

    }

​

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

​

    /* Calculate geometry */

    inftl->cylinders = 1024;

    inftl->heads = 16;

​

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

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

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