NAND read/write fix

[people/ms/u-boot.git] / drivers / mtd / nand / nand_util.c

/*
 * drivers/mtd/nand/nand_util.c
 *
 * Copyright (C) 2006 by Weiss-Electronic GmbH.
 * All rights reserved.
 *
 * @author:     Guido Classen <clagix@gmail.com>
 * @descr:      NAND Flash support
 * @references: borrowed heavily from Linux mtd-utils code:
 *              flash_eraseall.c by Arcom Control System Ltd
 *              nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com)
 *                             and Thomas Gleixner (tglx@linutronix.de)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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 <common.h>

#if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY)

#include <command.h>
#include <watchdog.h>
#include <malloc.h>
#include <div64.h>


#include <asm/errno.h>
#include <linux/mtd/mtd.h>
#include <nand.h>
#include <jffs2/jffs2.h>

typedef struct erase_info erase_info_t;
typedef struct mtd_info   mtd_info_t;

/* support only for native endian JFFS2 */
#define cpu_to_je16(x) (x)
#define cpu_to_je32(x) (x)

/*****************************************************************************/
static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip)
{
        return 0;
}

/**
 * nand_erase_opts: - erase NAND flash with support for various options
 *                    (jffs2 formating)
 *
 * @param meminfo       NAND device to erase
 * @param opts          options,  @see struct nand_erase_options
 * @return              0 in case of success
 *
 * This code is ported from flash_eraseall.c from Linux mtd utils by
 * Arcom Control System Ltd.
 */
int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
{
        struct jffs2_unknown_node cleanmarker;
        erase_info_t erase;
        ulong erase_length;
        int bbtest = 1;
        int result;
        int percent_complete = -1;
        int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL;
        const char *mtd_device = meminfo->name;
        struct mtd_oob_ops oob_opts;
        struct nand_chip *chip = meminfo->priv;
        uint8_t buf[64];

        memset(buf, 0, sizeof(buf));
        memset(&erase, 0, sizeof(erase));
        memset(&oob_opts, 0, sizeof(oob_opts));

        erase.mtd = meminfo;
        erase.len  = meminfo->erasesize;
        erase.addr = opts->offset;
        erase_length = opts->length;


        cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
        cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
        cleanmarker.totlen = cpu_to_je32(8);
        cleanmarker.hdr_crc = cpu_to_je32(
        crc32_no_comp(0, (unsigned char *) &cleanmarker,
        sizeof(struct jffs2_unknown_node) - 4));

        /* scrub option allows to erase badblock. To prevent internal
         * check from erase() method, set block check method to dummy
         * and disable bad block table while erasing.
         */
        if (opts->scrub) {
                struct nand_chip *priv_nand = meminfo->priv;

                nand_block_bad_old = priv_nand->block_bad;
                priv_nand->block_bad = nand_block_bad_scrub;
                /* we don't need the bad block table anymore...
                 * after scrub, there are no bad blocks left!
                 */
                if (priv_nand->bbt) {
                        kfree(priv_nand->bbt);
                }
                priv_nand->bbt = NULL;
        }

        if (erase_length < meminfo->erasesize) {
                printf("Warning: Erase size 0x%08lx smaller than one "  \
                       "erase block 0x%08x\n",erase_length, meminfo->erasesize);
                printf("         Erasing 0x%08x instead\n", meminfo->erasesize);
                erase_length = meminfo->erasesize;
        }

        for (;
             erase.addr < opts->offset + erase_length;
             erase.addr += meminfo->erasesize) {

                WATCHDOG_RESET ();

                if (!opts->scrub && bbtest) {
                        int ret = meminfo->block_isbad(meminfo, erase.addr);
                        if (ret > 0) {
                                if (!opts->quiet)
                                        printf("\rSkipping bad block at  "
                                               "0x%08x                   "
                                               "                         \n",
                                               erase.addr);
                                continue;

                        } else if (ret < 0) {
                                printf("\n%s: MTD get bad block failed: %d\n",
                                       mtd_device,
                                       ret);
                                return -1;
                        }
                }

                result = meminfo->erase(meminfo, &erase);
                if (result != 0) {
                        printf("\n%s: MTD Erase failure: %d\n",
                               mtd_device, result);
                        continue;
                }

                /* format for JFFS2 ? */
                if (opts->jffs2) {

                        chip->ops.len = chip->ops.ooblen = 64;
                        chip->ops.datbuf = NULL;
                        chip->ops.oobbuf = buf;
                        chip->ops.ooboffs = chip->badblockpos & ~0x01;

                        result = meminfo->write_oob(meminfo,
                                                        erase.addr + meminfo->oobsize,
                                                        &chip->ops);
                        if (result != 0) {
                                printf("\n%s: MTD writeoob failure: %d\n",
                                mtd_device, result);
                                continue;
                        }
                        else
                                printf("%s: MTD writeoob at 0x%08x\n",mtd_device, erase.addr + meminfo->oobsize );
                }

                if (!opts->quiet) {
                        unsigned long long n =(unsigned long long)
                                (erase.addr + meminfo->erasesize - opts->offset)
                                * 100;
                        int percent;

                        do_div(n, erase_length);
                        percent = (int)n;

                        /* output progress message only at whole percent
                         * steps to reduce the number of messages printed
                         * on (slow) serial consoles
                         */
                        if (percent != percent_complete) {
                                percent_complete = percent;

                                printf("\rErasing at 0x%x -- %3d%% complete.",
                                erase.addr, percent);

                                if (opts->jffs2 && result == 0)
                                printf(" Cleanmarker written at 0x%x.",
                                erase.addr);
                        }
                }
        }
        if (!opts->quiet)
                printf("\n");

        if (nand_block_bad_old) {
                struct nand_chip *priv_nand = meminfo->priv;

                priv_nand->block_bad = nand_block_bad_old;
                priv_nand->scan_bbt(meminfo);
        }

        return 0;
}

/* XXX U-BOOT XXX */
#if 0

#define MAX_PAGE_SIZE   2048
#define MAX_OOB_SIZE    64

/*
 * buffer array used for writing data
 */
static unsigned char data_buf[MAX_PAGE_SIZE];
static unsigned char oob_buf[MAX_OOB_SIZE];

/* OOB layouts to pass into the kernel as default */
static struct nand_ecclayout none_ecclayout = {
        .useecc = MTD_NANDECC_OFF,
};

static struct nand_ecclayout jffs2_ecclayout = {
        .useecc = MTD_NANDECC_PLACE,
        .eccbytes = 6,
        .eccpos = { 0, 1, 2, 3, 6, 7 }
};

static struct nand_ecclayout yaffs_ecclayout = {
        .useecc = MTD_NANDECC_PLACE,
        .eccbytes = 6,
        .eccpos = { 8, 9, 10, 13, 14, 15}
};

static struct nand_ecclayout autoplace_ecclayout = {
        .useecc = MTD_NANDECC_AUTOPLACE
};
#endif

/* XXX U-BOOT XXX */
#if 0
/******************************************************************************
 * Support for locking / unlocking operations of some NAND devices
 *****************************************************************************/

#define NAND_CMD_LOCK           0x2a
#define NAND_CMD_LOCK_TIGHT     0x2c
#define NAND_CMD_UNLOCK1        0x23
#define NAND_CMD_UNLOCK2        0x24
#define NAND_CMD_LOCK_STATUS    0x7a

/**
 * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
 *            state
 *
 * @param meminfo       nand mtd instance
 * @param tight         bring device in lock tight mode
 *
 * @return              0 on success, -1 in case of error
 *
 * The lock / lock-tight command only applies to the whole chip. To get some
 * parts of the chip lock and others unlocked use the following sequence:
 *
 * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
 * - Call nand_unlock() once for each consecutive area to be unlocked
 * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
 *
 *   If the device is in lock-tight state software can't change the
 *   current active lock/unlock state of all pages. nand_lock() / nand_unlock()
 *   calls will fail. It is only posible to leave lock-tight state by
 *   an hardware signal (low pulse on _WP pin) or by power down.
 */
int nand_lock(nand_info_t *meminfo, int tight)
{
        int ret = 0;
        int status;
        struct nand_chip *this = meminfo->priv;

        /* select the NAND device */
        this->select_chip(meminfo, 0);

        this->cmdfunc(meminfo,
                      (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
                      -1, -1);

        /* call wait ready function */
        status = this->waitfunc(meminfo, this, FL_WRITING);

        /* see if device thinks it succeeded */
        if (status & 0x01) {
                ret = -1;
        }

        /* de-select the NAND device */
        this->select_chip(meminfo, -1);
        return ret;
}

/**
 * nand_get_lock_status: - query current lock state from one page of NAND
 *                         flash
 *
 * @param meminfo       nand mtd instance
 * @param offset        page address to query (muss be page aligned!)
 *
 * @return              -1 in case of error
 *                      >0 lock status:
 *                        bitfield with the following combinations:
 *                        NAND_LOCK_STATUS_TIGHT: page in tight state
 *                        NAND_LOCK_STATUS_LOCK:  page locked
 *                        NAND_LOCK_STATUS_UNLOCK: page unlocked
 *
 */
int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
{
        int ret = 0;
        int chipnr;
        int page;
        struct nand_chip *this = meminfo->priv;

        /* select the NAND device */
        chipnr = (int)(offset >> this->chip_shift);
        this->select_chip(meminfo, chipnr);


        if ((offset & (meminfo->writesize - 1)) != 0) {
                printf ("nand_get_lock_status: "
                        "Start address must be beginning of "
                        "nand page!\n");
                ret = -1;
                goto out;
        }

        /* check the Lock Status */
        page = (int)(offset >> this->page_shift);
        this->cmdfunc(meminfo, NAND_CMD_LOCK_STATUS, -1, page & this->pagemask);

        ret = this->read_byte(meminfo) & (NAND_LOCK_STATUS_TIGHT
                                          | NAND_LOCK_STATUS_LOCK
                                          | NAND_LOCK_STATUS_UNLOCK);

 out:
        /* de-select the NAND device */
        this->select_chip(meminfo, -1);
        return ret;
}

/**
 * nand_unlock: - Unlock area of NAND pages
 *                only one consecutive area can be unlocked at one time!
 *
 * @param meminfo       nand mtd instance
 * @param start         start byte address
 * @param length        number of bytes to unlock (must be a multiple of
 *                      page size nand->writesize)
 *
 * @return              0 on success, -1 in case of error
 */
int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
{
        int ret = 0;
        int chipnr;
        int status;
        int page;
        struct nand_chip *this = meminfo->priv;
        printf ("nand_unlock: start: %08x, length: %d!\n",
                (int)start, (int)length);

        /* select the NAND device */
        chipnr = (int)(start >> this->chip_shift);
        this->select_chip(meminfo, chipnr);

        /* check the WP bit */
        this->cmdfunc(meminfo, NAND_CMD_STATUS, -1, -1);
        if ((this->read_byte(meminfo) & 0x80) == 0) {
                printf ("nand_unlock: Device is write protected!\n");
                ret = -1;
                goto out;
        }

        if ((start & (meminfo->writesize - 1)) != 0) {
                printf ("nand_unlock: Start address must be beginning of "
                        "nand page!\n");
                ret = -1;
                goto out;
        }

        if (length == 0 || (length & (meminfo->writesize - 1)) != 0) {
                printf ("nand_unlock: Length must be a multiple of nand page "
                        "size!\n");
                ret = -1;
                goto out;
        }

        /* submit address of first page to unlock */
        page = (int)(start >> this->page_shift);
        this->cmdfunc(meminfo, NAND_CMD_UNLOCK1, -1, page & this->pagemask);

        /* submit ADDRESS of LAST page to unlock */
        page += (int)(length >> this->page_shift) - 1;
        this->cmdfunc(meminfo, NAND_CMD_UNLOCK2, -1, page & this->pagemask);

        /* call wait ready function */
        status = this->waitfunc(meminfo, this, FL_WRITING);
        /* see if device thinks it succeeded */
        if (status & 0x01) {
                /* there was an error */
                ret = -1;
                goto out;
        }

 out:
        /* de-select the NAND device */
        this->select_chip(meminfo, -1);
        return ret;
}
#endif

/**
 * get_len_incl_bad
 *
 * Check if length including bad blocks fits into device.
 *
 * @param nand NAND device
 * @param offset offset in flash
 * @param length image length
 * @return image length including bad blocks
 */
static size_t get_len_incl_bad (nand_info_t *nand, size_t offset,
                                const size_t length)
{
        size_t len_incl_bad = 0;
        size_t len_excl_bad = 0;
        size_t block_len;

        while (len_excl_bad < length) {
                block_len = nand->erasesize - (offset & (nand->erasesize - 1));

                if (!nand_block_isbad (nand, offset & ~(nand->erasesize - 1)))
                        len_excl_bad += block_len;

                len_incl_bad += block_len;
                offset       += block_len;

                if ((offset + len_incl_bad) >= nand->size)
                        break;
        }

        return len_incl_bad;
}

/**
 * nand_write_skip_bad:
 *
 * Write image to NAND flash.
 * Blocks that are marked bad are skipped and the is written to the next
 * block instead as long as the image is short enough to fit even after
 * skipping the bad blocks.
 *
 * @param nand          NAND device
 * @param offset        offset in flash
 * @param length        buffer length
 * @param buf           buffer to read from
 * @return              0 in case of success
 */
int nand_write_skip_bad(nand_info_t *nand, size_t offset, size_t *length,
                        u_char *buffer)
{
        int rval;
        size_t left_to_write = *length;
        size_t len_incl_bad;
        u_char *p_buffer = buffer;

        /* Reject writes, which are not page aligned */
        if ((offset & (nand->writesize - 1)) != 0 ||
            (*length & (nand->writesize - 1)) != 0) {
                printf ("Attempt to write non page aligned data\n");
                return -EINVAL;
        }

        len_incl_bad = get_len_incl_bad (nand, offset, *length);

        if ((offset + len_incl_bad) >= nand->size) {
                printf ("Attempt to write outside the flash area\n");
                return -EINVAL;
        }

        if (len_incl_bad == *length) {
                rval = nand_write (nand, offset, length, buffer);
                if (rval != 0) {
                        printf ("NAND write to offset %x failed %d\n",
                                offset, rval);
                        return rval;
                }
        }

        while (left_to_write > 0) {
                size_t block_offset = offset & (nand->erasesize - 1);
                size_t write_size;

                if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
                        printf ("Skip bad block 0x%08x\n",
                                offset & ~(nand->erasesize - 1));
                        offset += nand->erasesize - block_offset;
                        continue;
                }

                if (left_to_write < (nand->erasesize - block_offset))
                        write_size = left_to_write;
                else
                        write_size = nand->erasesize - block_offset;

                rval = nand_write (nand, offset, &write_size, p_buffer);
                if (rval != 0) {
                        printf ("NAND write to offset %x failed %d\n",
                                offset, rval);
                        *length -= left_to_write;
                        return rval;
                }

                left_to_write -= write_size;
                offset        += write_size;
                p_buffer      += write_size;
        }

        return 0;
}

/**
 * nand_read_skip_bad:
 *
 * Read image from NAND flash.
 * Blocks that are marked bad are skipped and the next block is readen
 * instead as long as the image is short enough to fit even after skipping the
 * bad blocks.
 *
 * @param nand NAND device
 * @param offset offset in flash
 * @param length buffer length, on return holds remaining bytes to read
 * @param buffer buffer to write to
 * @return 0 in case of success
 */
int nand_read_skip_bad(nand_info_t *nand, size_t offset, size_t *length,
                       u_char *buffer)
{
        int rval;
        size_t left_to_read = *length;
        size_t len_incl_bad;
        u_char *p_buffer = buffer;

        len_incl_bad = get_len_incl_bad (nand, offset, *length);

        if ((offset + len_incl_bad) >= nand->size) {
                printf ("Attempt to read outside the flash area\n");
                return -EINVAL;
        }

        if (len_incl_bad == *length) {
                rval = nand_read (nand, offset, length, buffer);
                if (rval != 0) {
                        printf ("NAND read from offset %x failed %d\n",
                                offset, rval);
                        return rval;
                }
        }

        while (left_to_read > 0) {
                size_t block_offset = offset & (nand->erasesize - 1);
                size_t read_length;

                if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
                        printf ("Skipping bad block 0x%08x\n",
                                offset & ~(nand->erasesize - 1));
                        offset += nand->erasesize - block_offset;
                        continue;
                }

                if (left_to_read < (nand->erasesize - block_offset))
                        read_length = left_to_read;
                else
                        read_length = nand->erasesize - block_offset;

                rval = nand_read (nand, offset, &read_length, p_buffer);
                if (rval != 0) {
                        printf ("NAND read from offset %x failed %d\n",
                                offset, rval);
                        *length -= left_to_read;
                        return rval;
                }

                left_to_read -= read_length;
                offset       += read_length;
                p_buffer     += read_length;
        }

        return 0;
}

#endif /* defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY) */