onenand_base.c

最新版的u-boot,2008-10-18发布

		return ONENAND_BBT_READ_FATAL_ERROR;
	}

	/* Grab the lock and see if the device is available */
	onenand_get_device(mtd, FL_READING);

	column = from & (mtd->oobsize - 1);

	while (read < len) {

		thislen = mtd->oobsize - column;
		thislen = min_t(int, thislen, len);

		this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);

		onenand_update_bufferram(mtd, from, 0);

		ret = onenand_bbt_wait(mtd, FL_READING);
		if (ret)
			break;

		this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
		read += thislen;
		if (read == len)
			break;

		buf += thislen;

		/* Read more? */
		if (read < len) {
			/* Update Page size */
			from += this->writesize;
			column = 0;
		}
	}

	/* Deselect and wake up anyone waiting on the device */
	onenand_release_device(mtd);

	ops->oobretlen = read;
	return ret;
}


#ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
/**
 * onenand_verify_oob - [GENERIC] verify the oob contents after a write
 * @param mtd           MTD device structure
 * @param buf           the databuffer to verify
 * @param to            offset to read from
 */
static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
{
	struct onenand_chip *this = mtd->priv;
	u_char *oob_buf = this->oob_buf;
	int status, i;

	this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
	onenand_update_bufferram(mtd, to, 0);
	status = this->wait(mtd, FL_READING);
	if (status)
		return status;

	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
	for (i = 0; i < mtd->oobsize; i++)
		if (buf[i] != 0xFF && buf[i] != oob_buf[i])
			return -EBADMSG;

	return 0;
}

/**
 * onenand_verify - [GENERIC] verify the chip contents after a write
 * @param mtd          MTD device structure
 * @param buf          the databuffer to verify
 * @param addr         offset to read from
 * @param len          number of bytes to read and compare
 */
static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
{
	struct onenand_chip *this = mtd->priv;
	void __iomem *dataram;
	int ret = 0;
	int thislen, column;

	while (len != 0) {
		thislen = min_t(int, this->writesize, len);
		column = addr & (this->writesize - 1);
		if (column + thislen > this->writesize)
			thislen = this->writesize - column;

		this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);

		onenand_update_bufferram(mtd, addr, 0);

		ret = this->wait(mtd, FL_READING);
		if (ret)
			return ret;

		onenand_update_bufferram(mtd, addr, 1);

		dataram = this->base + ONENAND_DATARAM;
		dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);

		if (memcmp(buf, dataram + column, thislen))
			return -EBADMSG;

		len -= thislen;
		buf += thislen;
		addr += thislen;
	}

	return 0;
}
#else
#define onenand_verify(...)             (0)
#define onenand_verify_oob(...)         (0)
#endif

#define NOTALIGNED(x)	((x & (mtd->writesize - 1)) != 0)

/**
 * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
 * @param mtd           MTD device structure
 * @param oob_buf       oob buffer
 * @param buf           source address
 * @param column        oob offset to write to
 * @param thislen       oob length to write
 */
static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
		const u_char *buf, int column, int thislen)
{
	struct onenand_chip *this = mtd->priv;
	struct nand_oobfree *free;
	int writecol = column;
	int writeend = column + thislen;
	int lastgap = 0;
	unsigned int i;

	free = this->ecclayout->oobfree;
	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
		if (writecol >= lastgap)
			writecol += free->offset - lastgap;
		if (writeend >= lastgap)
			writeend += free->offset - lastgap;
		lastgap = free->offset + free->length;
	}
	free = this->ecclayout->oobfree;
	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
		int free_end = free->offset + free->length;
		if (free->offset < writeend && free_end > writecol) {
			int st = max_t(int,free->offset,writecol);
			int ed = min_t(int,free_end,writeend);
			int n = ed - st;
			memcpy(oob_buf + st, buf, n);
			buf += n;
		} else if (column == 0)
			break;
	}
	return 0;
}

/**
 * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
 * @param mtd           MTD device structure
 * @param to            offset to write to
 * @param ops           oob operation description structure
 *
 * Write main and/or oob with ECC
 */
static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
		struct mtd_oob_ops *ops)
{
	struct onenand_chip *this = mtd->priv;
	int written = 0, column, thislen, subpage;
	int oobwritten = 0, oobcolumn, thisooblen, oobsize;
	size_t len = ops->len;
	size_t ooblen = ops->ooblen;
	const u_char *buf = ops->datbuf;
	const u_char *oob = ops->oobbuf;
	u_char *oobbuf;
	int ret = 0;

	MTDDEBUG(MTD_DEBUG_LEVEL3,
		"onenand_write_ops_nolock: to = 0x%08x, len = %i\n",
		(unsigned int) to, (int) len);

	/* Initialize retlen, in case of early exit */
	ops->retlen = 0;
	ops->oobretlen = 0;

	/* Do not allow writes past end of device */
	if (unlikely((to + len) > mtd->size)) {
		printk(KERN_ERR "onenand_write_ops_nolock: Attempt write to past end of device\n");
		return -EINVAL;
	}

	/* Reject writes, which are not page aligned */
	if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
		printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
		return -EINVAL;
	}

	if (ops->mode == MTD_OOB_AUTO)
		oobsize = this->ecclayout->oobavail;
	else
		oobsize = mtd->oobsize;

	oobcolumn = to & (mtd->oobsize - 1);

	column = to & (mtd->writesize - 1);

	/* Loop until all data write */
	while (written < len) {
		u_char *wbuf = (u_char *) buf;

		thislen = min_t(int, mtd->writesize - column, len - written);
		thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);

		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);

		/* Partial page write */
		subpage = thislen < mtd->writesize;
		if (subpage) {
			memset(this->page_buf, 0xff, mtd->writesize);
			memcpy(this->page_buf + column, buf, thislen);
			wbuf = this->page_buf;
		}

		this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);

		if (oob) {
			oobbuf = this->oob_buf;

			/* We send data to spare ram with oobsize
			 *                          * to prevent byte access */
			memset(oobbuf, 0xff, mtd->oobsize);
			if (ops->mode == MTD_OOB_AUTO)
				onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
			else
				memcpy(oobbuf + oobcolumn, oob, thisooblen);

			oobwritten += thisooblen;
			oob += thisooblen;
			oobcolumn = 0;
		} else
			oobbuf = (u_char *) ffchars;

		this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);

		this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);

		ret = this->wait(mtd, FL_WRITING);

		/* In partial page write we don't update bufferram */
		onenand_update_bufferram(mtd, to, !ret && !subpage);
		if (ONENAND_IS_2PLANE(this)) {
			ONENAND_SET_BUFFERRAM1(this);
			onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
		}

		if (ret) {
			printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
			break;
		}

		/* Only check verify write turn on */
		ret = onenand_verify(mtd, buf, to, thislen);
		if (ret) {
			printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
			break;
		}

		written += thislen;

		if (written == len)
			break;

		column = 0;
		to += thislen;
		buf += thislen;
	}

	ops->retlen = written;

	return ret;
}

/**
 * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
 * @param mtd           MTD device structure
 * @param to            offset to write to
 * @param len           number of bytes to write
 * @param retlen        pointer to variable to store the number of written bytes
 * @param buf           the data to write
 * @param mode          operation mode
 *
 * OneNAND write out-of-band
 */
static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
		struct mtd_oob_ops *ops)
{
	struct onenand_chip *this = mtd->priv;
	int column, ret = 0, oobsize;
	int written = 0;
	u_char *oobbuf;
	size_t len = ops->ooblen;
	const u_char *buf = ops->oobbuf;
	mtd_oob_mode_t mode = ops->mode;

	to += ops->ooboffs;

	MTDDEBUG(MTD_DEBUG_LEVEL3,
		"onenand_write_oob_nolock: to = 0x%08x, len = %i\n",
		(unsigned int) to, (int) len);

	/* Initialize retlen, in case of early exit */
	ops->oobretlen = 0;

	if (mode == MTD_OOB_AUTO)
		oobsize = this->ecclayout->oobavail;
	else
		oobsize = mtd->oobsize;

	column = to & (mtd->oobsize - 1);

	if (unlikely(column >= oobsize)) {
		printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
		return -EINVAL;
	}

	/* For compatibility with NAND: Do not allow write past end of page */
	if (unlikely(column + len > oobsize)) {
		printk(KERN_ERR "onenand_write_oob_nolock: "
				"Attempt to write past end of page\n");
		return -EINVAL;
	}

	/* Do not allow reads past end of device */
	if (unlikely(to >= mtd->size ||
				column + len > ((mtd->size >> this->page_shift) -
					(to >> this->page_shift)) * oobsize)) {
		printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
		return -EINVAL;
	}

	oobbuf = this->oob_buf;

	/* Loop until all data write */
	while (written < len) {
		int thislen = min_t(int, oobsize, len - written);

		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);

		/* We send data to spare ram with oobsize
		 * to prevent byte access */
		memset(oobbuf, 0xff, mtd->oobsize);
		if (mode == MTD_OOB_AUTO)
			onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
		else
			memcpy(oobbuf + column, buf, thislen);
		this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);

		this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);

		onenand_update_bufferram(mtd, to, 0);
		if (ONENAND_IS_2PLANE(this)) {
			ONENAND_SET_BUFFERRAM1(this);
			onenand_update_bufferram(mtd, to + this->writesize, 0);
		}

		ret = this->wait(mtd, FL_WRITING);
		if (ret) {
			printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
			break;
		}

		ret = onenand_verify_oob(mtd, oobbuf, to);
		if (ret) {
			printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
			break;
		}

		written += thislen;
		if (written == len)
			break;

		to += mtd->writesize;
		buf += thislen;
		column = 0;
	}

	ops->oobretlen = written;

	return ret;
}

/**
 * onenand_write - [MTD Interface] compability function for onenand_write_ecc
 * @param mtd		MTD device structure
 * @param to		offset to write to
 * @param len		number of bytes to write
 * @param retlen	pointer to variable to store the number of written bytes
 * @param buf		the data to write
 *
 * Write with ECC
 */
int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
		  size_t * retlen, const u_char * buf)
{
	struct mtd_oob_ops ops = {
		.len    = len,
		.ooblen = 0,
		.datbuf = (u_char *) buf,
		.oobbuf = NULL,
	};
	int ret;

	onenand_get_device(mtd, FL_WRITING);
	ret = onenand_write_ops_nolock(mtd, to, &ops);
	onenand_release_device(mtd);

	*retlen = ops.retlen;
	return ret;
}

/**
 * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
 * @param mtd		MTD device structure
 * @param to		offset to write to
 * @param ops		oob operation description structure
 *
 * OneNAND write main and/or out-of-band
 */
int onenand_write_oob(struct mtd_info *mtd, loff_t to,
			struct mtd_oob_ops *ops)
{
	int ret;

	switch (ops->mode) {
	case MTD_OOB_PLACE:
	case MTD_OOB_AUTO:
		break;
	case MTD_OOB_RAW:
		/* Not implemented yet */
	default:
		return -EINVAL;
	}

	onenand_get_device(mtd, FL_WRITING);
	if (ops->datbuf)
		ret = onenand_write_ops_nolock(mtd, to, ops);
	else
		ret = onenand_write_oob_nolock(mtd, to, ops);
	onenand_release_device(mtd);

	return ret;

}

/**
 * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
 * @param mtd		MTD device structure
 * @param ofs		offset from device start
 * @param allowbbt	1, if its allowed to access the bbt area
 *
 * Check, if the block is bad, Either by reading the bad block table or