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Commit d15057b7 authored by Kyungmin Park's avatar Kyungmin Park Committed by David Woodhouse
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[MTD] [OneNAND] main read/write ops support for yaffs2 



Now we can use yaffs2 on OneNAND

Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent 12f77c9e

drivers/mtd/onenand/onenand_base.c

+233 −116
Original line number Diff line number Diff line
@@ -763,31 +763,83 @@ static void onenand_release_device(struct mtd_info *mtd) 
}



/**

 * onenand_read - [MTD Interface] Read data from flash

 * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer

 * @param mtd		MTD device structure

 * @param buf		destination address

 * @param column	oob offset to read from

 * @param thislen	oob length to read

 */

static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,

				int thislen)

{

	struct onenand_chip *this = mtd->priv;

	struct nand_oobfree *free;

	int readcol = column;

	int readend = column + thislen;

	int lastgap = 0;

	unsigned int i;

	uint8_t *oob_buf = this->oob_buf;



	free = this->ecclayout->oobfree;

	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {

		if (readcol >= lastgap)

			readcol += free->offset - lastgap;

		if (readend >= lastgap)

			readend += free->offset - lastgap;

		lastgap = free->offset + free->length;

	}

	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);

	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 < readend && free_end > readcol) {

			int st = max_t(int,free->offset,readcol);

			int ed = min_t(int,free_end,readend);

			int n = ed - st;

			memcpy(buf, oob_buf + st, n);

			buf += n;

		} else if (column == 0)

			break;

	}

	return 0;

}



/**

 * onenand_read_ops - [OneNAND Interface] OneNAND read main and/or out-of-band

 * @param mtd		MTD device structure

 * @param from		offset to read from

 * @param len		number of bytes to read

 * @param retlen	pointer to variable to store the number of read bytes

 * @param buf		the databuffer to put data

 * @param ops:		oob operation description structure

 *

 * Read with ecc

 * OneNAND read main and/or out-of-band data

 */

static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,

	size_t *retlen, u_char *buf)

static int onenand_read_ops(struct mtd_info *mtd, loff_t from,

				struct mtd_oob_ops *ops)

{

	struct onenand_chip *this = mtd->priv;

	struct mtd_ecc_stats stats;

	int read = 0, column;

	int thislen;

	size_t len = ops->len;

	size_t ooblen = ops->ooblen;

	u_char *buf = ops->datbuf;

	u_char *oobbuf = ops->oobbuf;

	int read = 0, column, thislen;

	int oobread = 0, oobcolumn, thisooblen, oobsize;

	int ret = 0, boundary = 0;

	int writesize = this->writesize;



	DEBUG(MTD_DEBUG_LEVEL3, "onenand_read: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);

	DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);



	if (ops->mode == MTD_OOB_AUTO)

		oobsize = this->ecclayout->oobavail;

	else

		oobsize = mtd->oobsize;



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



	/* Do not allow reads past end of device */

	if ((from + len) > mtd->size) {

		printk(KERN_ERR "onenand_read: Attempt read beyond end of device\n");

		*retlen = 0;

		printk(KERN_ERR "onenand_read_ops: Attempt read beyond end of device\n");

		ops->retlen = 0;

		ops->oobretlen = 0;

		return -EINVAL;

	}
@@ -832,6 +884,21 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len, 
 		}

 		/* While load is going, read from last bufferRAM */

 		this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);



		/* Read oob area if needed */

		if (oobbuf) {

			thisooblen = oobsize - oobcolumn;

			thisooblen = min_t(int, thisooblen, ooblen - oobread);



			if (ops->mode == MTD_OOB_AUTO)

				onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);

			else

				this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);

			oobread += thisooblen;

			oobbuf += thisooblen;

			oobcolumn = 0;

		}



 		/* See if we are done */

 		read += thislen;

 		if (read == len)
@@ -857,7 +924,8 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len, 
	 * fs driver will take care of that, because

	 * retlen == desired len and result == -EBADMSG

	 */

	*retlen = read;

	ops->retlen = read;

	ops->oobretlen = oobread;



	if (mtd->ecc_stats.failed - stats.failed)

		return -EBADMSG;
@@ -868,56 +936,11 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len, 
	return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;

}



/**

 * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer

 * @param mtd		MTD device structure

 * @param buf		destination address

 * @param column	oob offset to read from

 * @param thislen	oob length to read

 */

static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,

				int thislen)

{

	struct onenand_chip *this = mtd->priv;

	struct nand_oobfree *free;

	int readcol = column;

	int readend = column + thislen;

	int lastgap = 0;

	unsigned int i;

	uint8_t *oob_buf = this->oob_buf;



	free = this->ecclayout->oobfree;

	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {

		if (readcol >= lastgap)

			readcol += free->offset - lastgap;

		if (readend >= lastgap)

			readend += free->offset - lastgap;

		lastgap = free->offset + free->length;

	}

	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);

	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 < readend && free_end > readcol) {

			int st = max_t(int,free->offset,readcol);

			int ed = min_t(int,free_end,readend);

			int n = ed - st;

			memcpy(buf, oob_buf + st, n);

			buf += n;

		} else if (column == 0)

			break;

	}

	return 0;

}



/**

 * onenand_do_read_oob - [MTD Interface] OneNAND read out-of-band

 * @param mtd		MTD device structure

 * @param from		offset to read from

 * @param len		number of bytes to read

 * @param retlen	pointer to variable to store the number of read bytes

 * @param buf		the databuffer to put data

 * @param mode		operation mode

 * @param ops:		oob operation description structure

 *

 * OneNAND read out-of-band data from the spare area

 */
@@ -1007,10 +1030,39 @@ static int onenand_do_read_oob(struct mtd_info *mtd, loff_t from, 
}



/**

 * onenand_read_oob - [MTD Interface] NAND write data and/or out-of-band

 * onenand_read - [MTD Interface] Read data from flash

 * @param mtd		MTD device structure

 * @param from		offset to read from

 * @param len		number of bytes to read

 * @param retlen	pointer to variable to store the number of read bytes

 * @param buf		the databuffer to put data

 *

 * Read with ecc

*/

static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,

	size_t *retlen, u_char *buf)

{

	struct mtd_oob_ops ops = {

		.len	= len,

		.ooblen	= 0,

		.datbuf	= buf,

		.oobbuf	= NULL,

	};

	int ret;



	ret = onenand_read_ops(mtd, from, &ops);

	*retlen = ops.retlen;



	return ret;

}



/**

 * onenand_read_oob - [MTD Interface] Read main and/or out-of-band

 * @param mtd:		MTD device structure

 * @param from:		offset to read from

 * @param ops:		oob operation description structure



 * Read main and/or out-of-band

 */

static int onenand_read_oob(struct mtd_info *mtd, loff_t from,

			    struct mtd_oob_ops *ops)
@@ -1024,6 +1076,10 @@ static int onenand_read_oob(struct mtd_info *mtd, loff_t from, 
	default:

		return -EINVAL;

	}



	if (ops->datbuf)

		return onenand_read_ops(mtd, from, ops);



	return onenand_do_read_oob(mtd, from, ops);

}
@@ -1148,7 +1204,6 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from, 
 * @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)

{
@@ -1176,7 +1231,6 @@ static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to 
 * @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)

{
@@ -1222,27 +1276,72 @@ static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, 
#define NOTALIGNED(x)	((x & (this->subpagesize - 1)) != 0)



/**

 * onenand_write - [MTD Interface] write buffer to FLASH

 * 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 - [OneNAND Interface] write main and/or 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 ops		oob operation description structure

 *

 * Write with ECC

 * Write main and/or oob with ECC

 */

static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,

	size_t *retlen, const u_char *buf)

static int onenand_write_ops(struct mtd_info *mtd, loff_t to,

				struct mtd_oob_ops *ops)

{

	struct onenand_chip *this = mtd->priv;

	int written = 0;

	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;

	int column, subpage;



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



	/* Initialize retlen, in case of early exit */

	*retlen = 0;

	ops->retlen = 0;

	ops->oobretlen = 0;



	/* Do not allow writes past end of device */

	if (unlikely((to + len) > mtd->size)) {
@@ -1256,6 +1355,13 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len, 
                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);



	/* Grab the lock and see if the device is available */
@@ -1263,9 +1369,11 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len, 


	/* Loop until all data write */

	while (written < len) {

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

		u_char *wbuf = (u_char *) buf;



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

		thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);



		cond_resched();



		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
@@ -1279,7 +1387,25 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len, 
		}



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

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



		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);
@@ -1317,51 +1443,11 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len, 
	/* Deselect and wake up anyone waiting on the device */

	onenand_release_device(mtd);



	*retlen = written;

	ops->retlen = written;



	return ret;

}



/**

 * 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_do_write_oob - [Internal] OneNAND write out-of-band
@@ -1478,6 +1564,33 @@ static int onenand_do_write_oob(struct mtd_info *mtd, loff_t to, 
	return ret;

}



/**

 * onenand_write - [MTD Interface] write buffer to FLASH

 * @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

 */

static 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;



	ret = onenand_write_ops(mtd, to, &ops);

	*retlen = ops.retlen;



	return ret;

}



/**

 * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band

 * @param mtd:		MTD device structure
@@ -1496,6 +1609,10 @@ static int onenand_write_oob(struct mtd_info *mtd, loff_t to, 
	default:

		return -EINVAL;

	}



	if (ops->datbuf)

		return onenand_write_ops(mtd, to, ops);



	return onenand_do_write_oob(mtd, to, ops);

}