1 files changed, 785 insertions, 77 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 30d6999e5f9..6e829095ea9 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -9,6 +9,10 @@
  *	auto-placement support, read-while load support, various fixes
  *	Copyright (C) Nokia Corporation, 2007
  *
+ *	Vishak G <vishak.g at samsung.com>, Rohit Hagargundgi <h.rohit at samsung.com>
+ *	Flex-OneNAND support
+ *	Copyright (C) Samsung Electronics, 2008
+ *
  * 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.
@@ -16,6 +20,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
@@ -27,6 +32,38 @@
 
 #include <asm/io.h>
 
+/* Default Flex-OneNAND boundary and lock respectively */
+static int flex_bdry[MAX_DIES * 2] = { -1, 0, -1, 0 };
+
+module_param_array(flex_bdry, int, NULL, 0400);
+MODULE_PARM_DESC(flex_bdry,	"SLC Boundary information for Flex-OneNAND"
+				"Syntax:flex_bdry=DIE_BDRY,LOCK,..."
+				"DIE_BDRY: SLC boundary of the die"
+				"LOCK: Locking information for SLC boundary"
+				"    : 0->Set boundary in unlocked status"
+				"    : 1->Set boundary in locked status");
+
+/**
+ *  onenand_oob_128 - oob info for Flex-Onenand with 4KB page
+ *  For now, we expose only 64 out of 80 ecc bytes
+ */
+static struct nand_ecclayout onenand_oob_128 = {
+	.eccbytes	= 64,
+	.eccpos		= {
+		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+		70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
+		86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
+		102, 103, 104, 105
+		},
+	.oobfree	= {
+		{2, 4}, {18, 4}, {34, 4}, {50, 4},
+		{66, 4}, {82, 4}, {98, 4}, {114, 4}
+	}
+};
+
 /**
  * onenand_oob_64 - oob info for large (2KB) page
  */
@@ -65,6 +102,14 @@ static const unsigned char ffchars[] = {
 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 48 */
 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 64 */
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 80 */
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 96 */
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 112 */
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,	/* 128 */
 };
 
 /**
@@ -171,6 +216,70 @@ static int onenand_buffer_address(int dataram1, int sectors, int count)
 }
 
 /**
+ * flexonenand_block- For given address return block number
+ * @param this         - OneNAND device structure
+ * @param addr		- Address for which block number is needed
+ */
+static unsigned flexonenand_block(struct onenand_chip *this, loff_t addr)
+{
+	unsigned boundary, blk, die = 0;
+
+	if (ONENAND_IS_DDP(this) && addr >= this->diesize[0]) {
+		die = 1;
+		addr -= this->diesize[0];
+	}
+
+	boundary = this->boundary[die];
+
+	blk = addr >> (this->erase_shift - 1);
+	if (blk > boundary)
+		blk = (blk + boundary + 1) >> 1;
+
+	blk += die ? this->density_mask : 0;
+	return blk;
+}
+
+inline unsigned onenand_block(struct onenand_chip *this, loff_t addr)
+{
+	if (!FLEXONENAND(this))
+		return addr >> this->erase_shift;
+	return flexonenand_block(this, addr);
+}
+
+/**
+ * flexonenand_addr - Return address of the block
+ * @this:		OneNAND device structure
+ * @block:		Block number on Flex-OneNAND
+ *
+ * Return address of the block
+ */
+static loff_t flexonenand_addr(struct onenand_chip *this, int block)
+{
+	loff_t ofs = 0;
+	int die = 0, boundary;
+
+	if (ONENAND_IS_DDP(this) && block >= this->density_mask) {
+		block -= this->density_mask;
+		die = 1;
+		ofs = this->diesize[0];
+	}
+
+	boundary = this->boundary[die];
+	ofs += (loff_t)block << (this->erase_shift - 1);
+	if (block > (boundary + 1))
+		ofs += (loff_t)(block - boundary - 1) << (this->erase_shift - 1);
+	return ofs;
+}
+
+loff_t onenand_addr(struct onenand_chip *this, int block)
+{
+	if (!FLEXONENAND(this))
+		return (loff_t)block << this->erase_shift;
+	return flexonenand_addr(this, block);
+}
+EXPORT_SYMBOL(onenand_addr);
+
+/**
  * onenand_get_density - [DEFAULT] Get OneNAND density
  * @param dev_id	OneNAND device ID
  *
@@ -183,6 +292,22 @@ static inline int onenand_get_density(int dev_id)
 }
 
 /**
+ * flexonenand_region - [Flex-OneNAND] Return erase region of addr
+ * @param mtd		MTD device structure
+ * @param addr		address whose erase region needs to be identified
+ */
+int flexonenand_region(struct mtd_info *mtd, loff_t addr)
+{
+	int i;
+
+	for (i = 0; i < mtd->numeraseregions; i++)
+		if (addr < mtd->eraseregions[i].offset)
+			break;
+	return i - 1;
+}
+EXPORT_SYMBOL(flexonenand_region);
+
+/**
  * onenand_command - [DEFAULT] Send command to OneNAND device
  * @param mtd		MTD device structure
  * @param cmd		the command to be sent
@@ -207,16 +332,28 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 		page = -1;
 		break;
 
+	case FLEXONENAND_CMD_PI_ACCESS:
+		/* addr contains die index */
+		block = addr * this->density_mask;
+		page = -1;
+		break;
+
 	case ONENAND_CMD_ERASE:
 	case ONENAND_CMD_BUFFERRAM:
 	case ONENAND_CMD_OTP_ACCESS:
-		block = (int) (addr >> this->erase_shift);
+		block = onenand_block(this, addr);
 		page = -1;
 		break;
 
+	case FLEXONENAND_CMD_READ_PI:
+		cmd = ONENAND_CMD_READ;
+		block = addr * this->density_mask;
+		page = 0;
+		break;
+
 	default:
-		block = (int) (addr >> this->erase_shift);
-		page = (int) (addr >> this->page_shift);
+		block = onenand_block(this, addr);
+		page = (int) (addr - onenand_addr(this, block)) >> this->page_shift;
 
 		if (ONENAND_IS_2PLANE(this)) {
 			/* Make the even block number */
@@ -236,7 +373,7 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 		value = onenand_bufferram_address(this, block);
 		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 
-		if (ONENAND_IS_2PLANE(this))
+		if (ONENAND_IS_MLC(this) || ONENAND_IS_2PLANE(this))
 			/* It is always BufferRAM0 */
 			ONENAND_SET_BUFFERRAM0(this);
 		else
@@ -258,13 +395,18 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 
 	if (page != -1) {
 		/* Now we use page size operation */
-		int sectors = 4, count = 4;
+		int sectors = 0, count = 0;
 		int dataram;
 
 		switch (cmd) {
+		case FLEXONENAND_CMD_RECOVER_LSB:
 		case ONENAND_CMD_READ:
 		case ONENAND_CMD_READOOB:
-			dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
+			if (ONENAND_IS_MLC(this))
+				/* It is always BufferRAM0 */
+				dataram = ONENAND_SET_BUFFERRAM0(this);
+			else
+				dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 			break;
 
 		default:
@@ -293,6 +435,30 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
 }
 
 /**
+ * onenand_read_ecc - return ecc status
+ * @param this		onenand chip structure
+ */
+static inline int onenand_read_ecc(struct onenand_chip *this)
+{
+	int ecc, i, result = 0;
+
+	if (!FLEXONENAND(this))
+		return this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+
+	for (i = 0; i < 4; i++) {
+		ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS + i);
+		if (likely(!ecc))
+			continue;
+		if (ecc & FLEXONENAND_UNCORRECTABLE_ERROR)
+			return ONENAND_ECC_2BIT_ALL;
+		else
+			result = ONENAND_ECC_1BIT_ALL;
+	}
+
+	return result;
+}
+
+/**
  * onenand_wait - [DEFAULT] wait until the command is done
  * @param mtd		MTD device structure
  * @param state		state to select the max. timeout value
@@ -331,14 +497,14 @@ static int onenand_wait(struct mtd_info *mtd, int state)
 	 * power off recovery (POR) test, it should read ECC status first
 	 */
 	if (interrupt & ONENAND_INT_READ) {
-		int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+		int ecc = onenand_read_ecc(this);
 		if (ecc) {
 			if (ecc & ONENAND_ECC_2BIT_ALL) {
 				printk(KERN_ERR "onenand_wait: ECC error = 0x%04x\n", ecc);
 				mtd->ecc_stats.failed++;
 				return -EBADMSG;
 			} else if (ecc & ONENAND_ECC_1BIT_ALL) {
-				printk(KERN_INFO "onenand_wait: correctable ECC error = 0x%04x\n", ecc);
+				printk(KERN_DEBUG "onenand_wait: correctable ECC error = 0x%04x\n", ecc);
 				mtd->ecc_stats.corrected++;
 			}
 		}
@@ -656,7 +822,7 @@ static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 
 	if (found && ONENAND_IS_DDP(this)) {
 		/* Select DataRAM for DDP */
-		int block = (int) (addr >> this->erase_shift);
+		int block = onenand_block(this, addr);
 		int value = onenand_bufferram_address(this, block);
 		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 	}
@@ -816,6 +982,149 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
 }
 
 /**
+ * onenand_recover_lsb - [Flex-OneNAND] Recover LSB page data
+ * @param mtd		MTD device structure
+ * @param addr		address to recover
+ * @param status	return value from onenand_wait / onenand_bbt_wait
+ *
+ * MLC NAND Flash cell has paired pages - LSB page and MSB page. LSB page has
+ * lower page address and MSB page has higher page address in paired pages.
+ * If power off occurs during MSB page program, the paired LSB page data can
+ * become corrupt. LSB page recovery read is a way to read LSB page though page
+ * data are corrupted. When uncorrectable error occurs as a result of LSB page
+ * read after power up, issue LSB page recovery read.
+ */
+static int onenand_recover_lsb(struct mtd_info *mtd, loff_t addr, int status)
+{
+	struct onenand_chip *this = mtd->priv;
+	int i;
+
+	/* Recovery is only for Flex-OneNAND */
+	if (!FLEXONENAND(this))
+		return status;
+
+	/* check if we failed due to uncorrectable error */
+	if (status != -EBADMSG && status != ONENAND_BBT_READ_ECC_ERROR)
+		return status;
+
+	/* check if address lies in MLC region */
+	i = flexonenand_region(mtd, addr);
+	if (mtd->eraseregions[i].erasesize < (1 << this->erase_shift))
+		return status;
+
+	/* We are attempting to reread, so decrement stats.failed
+	 * which was incremented by onenand_wait due to read failure
+	 */
+	printk(KERN_INFO "onenand_recover_lsb: Attempting to recover from uncorrectable read\n");
+	mtd->ecc_stats.failed--;
+
+	/* Issue the LSB page recovery command */
+	this->command(mtd, FLEXONENAND_CMD_RECOVER_LSB, addr, this->writesize);
+	return this->wait(mtd, FL_READING);
+}
+
+/**
+ * onenand_mlc_read_ops_nolock - MLC OneNAND read main and/or out-of-band
+ * @param mtd		MTD device structure
+ * @param from		offset to read from
+ * @param ops:		oob operation description structure
+ *
+ * MLC OneNAND / Flex-OneNAND has 4KB page size and 4KB dataram.
+ * So, read-while-load is not present.
+ */
+static int onenand_mlc_read_ops_nolock(struct mtd_info *mtd, loff_t from,
+				struct mtd_oob_ops *ops)
+{
+	struct onenand_chip *this = mtd->priv;
+	struct mtd_ecc_stats stats;
+	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;
+	int writesize = this->writesize;
+
+	DEBUG(MTD_DEBUG_LEVEL3, "onenand_mlc_read_ops_nolock: 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_mlc_read_ops_nolock: Attempt read beyond end of device\n");
+		ops->retlen = 0;
+		ops->oobretlen = 0;
+		return -EINVAL;
+	}
+
+	stats = mtd->ecc_stats;
+
+	while (read < len) {
+		cond_resched();
+
+		thislen = min_t(int, writesize, len - read);
+
+		column = from & (writesize - 1);
+		if (column + thislen > writesize)
+			thislen = writesize - column;
+
+		if (!onenand_check_bufferram(mtd, from)) {
+			this->command(mtd, ONENAND_CMD_READ, from, writesize);
+
+			ret = this->wait(mtd, FL_READING);
+			if (unlikely(ret))
+				ret = onenand_recover_lsb(mtd, from, ret);
+			onenand_update_bufferram(mtd, from, !ret);
+			if (ret == -EBADMSG)
+				ret = 0;
+		}
+
+		this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
+		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;
+		}
+
+		read += thislen;
+		if (read == len)
+			break;
+
+		from += thislen;
+		buf += thislen;
+	}
+
+	/*
+	 * Return success, if no ECC failures, else -EBADMSG
+	 * fs driver will take care of that, because
+	 * retlen == desired len and result == -EBADMSG
+	 */
+	ops->retlen = read;
+	ops->oobretlen = oobread;
+
+	if (ret)
+		return ret;
+
+	if (mtd->ecc_stats.failed - stats.failed)
+		return -EBADMSG;
+
+	return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
+}
+
+/**
  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
  * @param mtd		MTD device structure
  * @param from		offset to read from
@@ -962,7 +1271,7 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 	size_t len = ops->ooblen;
 	mtd_oob_mode_t mode = ops->mode;
 	u_char *buf = ops->oobbuf;
-	int ret = 0;
+	int ret = 0, readcmd;
 
 	from += ops->ooboffs;
 
@@ -993,17 +1302,22 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 
 	stats = mtd->ecc_stats;
 
+	readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
+
 	while (read < len) {
 		cond_resched();
 
 		thislen = oobsize - column;
 		thislen = min_t(int, thislen, len);
 
-		this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
+		this->command(mtd, readcmd, from, mtd->oobsize);
 
 		onenand_update_bufferram(mtd, from, 0);
 
 		ret = this->wait(mtd, FL_READING);
+		if (unlikely(ret))
+			ret = onenand_recover_lsb(mtd, from, ret);
+
 		if (ret && ret != -EBADMSG) {
 			printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
 			break;
@@ -1053,6 +1367,7 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 	size_t *retlen, u_char *buf)
 {
+	struct onenand_chip *this = mtd->priv;
 	struct mtd_oob_ops ops = {
 		.len	= len,
 		.ooblen	= 0,
@@ -1062,7 +1377,9 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 	int ret;
 
 	onenand_get_device(mtd, FL_READING);
-	ret = onenand_read_ops_nolock(mtd, from, &ops);
+	ret = ONENAND_IS_MLC(this) ?
+		onenand_mlc_read_ops_nolock(mtd, from, &ops) :
+		onenand_read_ops_nolock(mtd, from, &ops);
 	onenand_release_device(mtd);
 
 	*retlen = ops.retlen;
@@ -1080,6 +1397,7 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
 			    struct mtd_oob_ops *ops)
 {
+	struct onenand_chip *this = mtd->priv;
 	int ret;
 
 	switch (ops->mode) {
@@ -1094,7 +1412,9 @@ static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
 
 	onenand_get_device(mtd, FL_READING);
 	if (ops->datbuf)
-		ret = onenand_read_ops_nolock(mtd, from, ops);
+		ret = ONENAND_IS_MLC(this) ?
+			onenand_mlc_read_ops_nolock(mtd, from, ops) :
+			onenand_read_ops_nolock(mtd, from, ops);
 	else
 		ret = onenand_read_oob_nolock(mtd, from, ops);
 	onenand_release_device(mtd);
@@ -1128,11 +1448,11 @@ static int onenand_bbt_wait(struct mtd_info *mtd, int state)
 	ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 
 	if (interrupt & ONENAND_INT_READ) {
-		int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+		int ecc = onenand_read_ecc(this);
 		if (ecc & ONENAND_ECC_2BIT_ALL) {
 			printk(KERN_INFO "onenand_bbt_wait: ecc error = 0x%04x"
 				", controller error 0x%04x\n", ecc, ctrl);
-			return ONENAND_BBT_READ_ERROR;
+			return ONENAND_BBT_READ_ECC_ERROR;
 		}
 	} else {
 		printk(KERN_ERR "onenand_bbt_wait: read timeout!"
@@ -1163,7 +1483,7 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
 {
 	struct onenand_chip *this = mtd->priv;
 	int read = 0, thislen, column;
-	int ret = 0;
+	int ret = 0, readcmd;
 	size_t len = ops->ooblen;
 	u_char *buf = ops->oobbuf;
 
@@ -1183,17 +1503,22 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
 
 	column = from & (mtd->oobsize - 1);
 
+	readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
+
 	while (read < len) {
 		cond_resched();
 
 		thislen = mtd->oobsize - column;
 		thislen = min_t(int, thislen, len);
 
-		this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
+		this->command(mtd, readcmd, from, mtd->oobsize);
 
 		onenand_update_bufferram(mtd, from, 0);
 
-		ret = onenand_bbt_wait(mtd, FL_READING);
+		ret = this->bbt_wait(mtd, FL_READING);
+		if (unlikely(ret))
+			ret = onenand_recover_lsb(mtd, from, ret);
+
 		if (ret)
 			break;
 
@@ -1230,9 +1555,11 @@ 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;
+	int status, i, readcmd;
 
-	this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
+	readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
+
+	this->command(mtd, readcmd, to, mtd->oobsize);
 	onenand_update_bufferram(mtd, to, 0);
 	status = this->wait(mtd, FL_READING);
 	if (status)
@@ -1633,7 +1960,7 @@ static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
 {
 	struct onenand_chip *this = mtd->priv;
 	int column, ret = 0, oobsize;
-	int written = 0;
+	int written = 0, oobcmd;
 	u_char *oobbuf;
 	size_t len = ops->ooblen;
 	const u_char *buf = ops->oobbuf;
@@ -1675,6 +2002,8 @@ static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
 
 	oobbuf = this->oob_buf;
 
+	oobcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_PROG : ONENAND_CMD_PROGOOB;
+
 	/* Loop until all data write */
 	while (written < len) {
 		int thislen = min_t(int, oobsize, len - written);
@@ -1692,7 +2021,14 @@ static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
 			memcpy(oobbuf + column, buf, thislen);
 		this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
 
-		this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
+		if (ONENAND_IS_MLC(this)) {
+			/* Set main area of DataRAM to 0xff*/
+			memset(this->page_buf, 0xff, mtd->writesize);
+			this->write_bufferram(mtd, ONENAND_DATARAM,
+					 this->page_buf, 0, mtd->writesize);
+		}
+
+		this->command(mtd, oobcmd, to, mtd->oobsize);
 
 		onenand_update_bufferram(mtd, to, 0);
 		if (ONENAND_IS_2PLANE(this)) {
@@ -1815,29 +2151,48 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
 	struct onenand_chip *this = mtd->priv;
 	unsigned int block_size;
-	loff_t addr;
-	int len;
-	int ret = 0;
+	loff_t addr = instr->addr;
+	loff_t len = instr->len;
+	int ret = 0, i;
+	struct mtd_erase_region_info *region = NULL;
+	loff_t region_end = 0;
 
 	DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%012llx, len = %llu\n", (unsigned long long) instr->addr, (unsigned long long) instr->len);
 
-	block_size = (1 << this->erase_shift);
-
-	/* Start address must align on block boundary */
-	if (unlikely(instr->addr & (block_size - 1))) {
-		printk(KERN_ERR "onenand_erase: Unaligned address\n");
+	/* Do not allow erase past end of device */
+	if (unlikely((len + addr) > mtd->size)) {
+		printk(KERN_ERR "onenand_erase: Erase past end of device\n");
 		return -EINVAL;
 	}
 
-	/* Length must align on block boundary */
-	if (unlikely(instr->len & (block_size - 1))) {
-		printk(KERN_ERR "onenand_erase: Length not block aligned\n");
-		return -EINVAL;
+	if (FLEXONENAND(this)) {
+		/* Find the eraseregion of this address */
+		i = flexonenand_region(mtd, addr);
+		region = &mtd->eraseregions[i];
+
+		block_size = region->erasesize;
+		region_end = region->offset + region->erasesize * region->numblocks;
+
+		/* Start address within region must align on block boundary.
+		 * Erase region's start offset is always block start address.
+		 */
+		if (unlikely((addr - region->offset) & (block_size - 1))) {
+			printk(KERN_ERR "onenand_erase: Unaligned address\n");
+			return -EINVAL;
+		}
+	} else {
+		block_size = 1 << this->erase_shift;
+
+		/* Start address must align on block boundary */
+		if (unlikely(addr & (block_size - 1))) {
+			printk(KERN_ERR "onenand_erase: Unaligned address\n");
+			return -EINVAL;
+		}
 	}
 
-	/* Do not allow erase past end of device */
-	if (unlikely((instr->len + instr->addr) > mtd->size)) {
-		printk(KERN_ERR "onenand_erase: Erase past end of device\n");
+	/* Length must align on block boundary */
+	if (unlikely(len & (block_size - 1))) {
+		printk(KERN_ERR "onenand_erase: Length not block aligned\n");
 		return -EINVAL;
 	}
 
@@ -1847,9 +2202,6 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 	onenand_get_device(mtd, FL_ERASING);
 
 	/* Loop throught the pages */
-	len = instr->len;
-	addr = instr->addr;
-
 	instr->state = MTD_ERASING;
 
 	while (len) {
@@ -1869,7 +2221,8 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 		ret = this->wait(mtd, FL_ERASING);
 		/* Check, if it is write protected */
 		if (ret) {
-			printk(KERN_ERR "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
+			printk(KERN_ERR "onenand_erase: Failed erase, block %d\n",
+						 onenand_block(this, addr));
 			instr->state = MTD_ERASE_FAILED;
 			instr->fail_addr = addr;
 			goto erase_exit;
@@ -1877,6 +2230,22 @@ static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
 
 		len -= block_size;
 		addr += block_size;
+
+		if (addr == region_end) {
+			if (!len)
+				break;
+			region++;
+
+			block_size = region->erasesize;
+			region_end = region->offset + region->erasesize * region->numblocks;
+
+			if (len & (block_size - 1)) {
+				/* FIXME: This should be handled at MTD partitioning level. */
+				printk(KERN_ERR "onenand_erase: Unaligned address\n");
+				goto erase_exit;
+			}
+		}
+
 	}
 
 	instr->state = MTD_ERASE_DONE;
@@ -1955,13 +2324,17 @@ static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	int block;
 
 	/* Get block number */
-	block = ((int) ofs) >> bbm->bbt_erase_shift;
+	block = onenand_block(this, ofs);
         if (bbm->bbt)
                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
 
         /* We write two bytes, so we dont have to mess with 16 bit access */
         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
-        return onenand_write_oob_nolock(mtd, ofs, &ops);
+	/* FIXME : What to do when marking SLC block in partition
+	 * 	   with MLC erasesize? For now, it is not advisable to
+	 *	   create partitions containing both SLC and MLC regions.
+	 */
+	return onenand_write_oob_nolock(mtd, ofs, &ops);
 }
 
 /**
@@ -2005,8 +2378,8 @@ static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int
 	int start, end, block, value, status;
 	int wp_status_mask;
 
-	start = ofs >> this->erase_shift;
-	end = len >> this->erase_shift;
+	start = onenand_block(this, ofs);
+	end = onenand_block(this, ofs + len) - 1;
 
 	if (cmd == ONENAND_CMD_LOCK)
 		wp_status_mask = ONENAND_WP_LS;
@@ -2018,7 +2391,7 @@ static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int
 		/* Set start block address */
 		this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
 		/* Set end block address */
-		this->write_word(start + end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
+		this->write_word(end, this->base +  ONENAND_REG_END_BLOCK_ADDRESS);
 		/* Write lock command */
 		this->command(mtd, cmd, 0, 0);
 
@@ -2039,7 +2412,7 @@ static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int
 	}
 
 	/* Block lock scheme */
-	for (block = start; block < start + end; block++) {
+	for (block = start; block < end + 1; block++) {
 		/* Set block address */
 		value = onenand_block_address(this, block);
 		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
@@ -2147,7 +2520,7 @@ static void onenand_unlock_all(struct mtd_info *mtd)
 {
 	struct onenand_chip *this = mtd->priv;
 	loff_t ofs = 0;
-	size_t len = this->chipsize;
+	loff_t len = mtd->size;
 
 	if (this->options & ONENAND_HAS_UNLOCK_ALL) {
 		/* Set start block address */
@@ -2163,12 +2536,16 @@ static void onenand_unlock_all(struct mtd_info *mtd)
 		    & ONENAND_CTRL_ONGO)
 			continue;
 
+		/* Don't check lock status */
+		if (this->options & ONENAND_SKIP_UNLOCK_CHECK)
+			return;
+
 		/* Check lock status */
 		if (onenand_check_lock_status(this))
 			return;
 
 		/* Workaround for all block unlock in DDP */
-		if (ONENAND_IS_DDP(this)) {
+		if (ONENAND_IS_DDP(this) && !FLEXONENAND(this)) {
 			/* All blocks on another chip */
 			ofs = this->chipsize >> 1;
 			len = this->chipsize >> 1;
@@ -2210,7 +2587,9 @@ static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
 	this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
 	this->wait(mtd, FL_OTPING);
 
-	ret = onenand_read_ops_nolock(mtd, from, &ops);
+	ret = ONENAND_IS_MLC(this) ?
+		onenand_mlc_read_ops_nolock(mtd, from, &ops) :
+		onenand_read_ops_nolock(mtd, from, &ops);
 
 	/* Exit OTP access mode */
 	this->command(mtd, ONENAND_CMD_RESET, 0, 0);
@@ -2277,21 +2656,32 @@ static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
 		size_t *retlen, u_char *buf)
 {
 	struct onenand_chip *this = mtd->priv;
-	struct mtd_oob_ops ops = {
-		.mode = MTD_OOB_PLACE,
-		.ooblen = len,
-		.oobbuf = buf,
-		.ooboffs = 0,
-	};
+	struct mtd_oob_ops ops;
 	int ret;
 
 	/* Enter OTP access mode */
 	this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
 	this->wait(mtd, FL_OTPING);
 
-	ret = onenand_write_oob_nolock(mtd, from, &ops);
-
-	*retlen = ops.oobretlen;
+	if (FLEXONENAND(this)) {
+		/*
+		 * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
+		 * main area of page 49.
+		 */
+		ops.len = mtd->writesize;
+		ops.ooblen = 0;
+		ops.datbuf = buf;
+		ops.oobbuf = NULL;
+		ret = onenand_write_ops_nolock(mtd, mtd->writesize * 49, &ops);
+		*retlen = ops.retlen;
+	} else {
+		ops.mode = MTD_OOB_PLACE;
+		ops.ooblen = len;
+		ops.oobbuf = buf;
+		ops.ooboffs = 0;
+		ret = onenand_write_oob_nolock(mtd, from, &ops);
+		*retlen = ops.oobretlen;
+	}
 
 	/* Exit OTP access mode */
 	this->command(mtd, ONENAND_CMD_RESET, 0, 0);
@@ -2475,27 +2865,34 @@ static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
 			size_t len)
 {
 	struct onenand_chip *this = mtd->priv;
-	u_char *oob_buf = this->oob_buf;
+	u_char *buf = FLEXONENAND(this) ? this->page_buf : this->oob_buf;
 	size_t retlen;
 	int ret;
 
-	memset(oob_buf, 0xff, mtd->oobsize);
+	memset(buf, 0xff, FLEXONENAND(this) ? this->writesize
+						 : mtd->oobsize);
 	/*
 	 * Note: OTP lock operation
 	 *       OTP block : 0xXXFC
 	 *       1st block : 0xXXF3 (If chip support)
 	 *       Both      : 0xXXF0 (If chip support)
 	 */
-	oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
+	if (FLEXONENAND(this))
+		buf[FLEXONENAND_OTP_LOCK_OFFSET] = 0xFC;
+	else
+		buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
 
 	/*
 	 * Write lock mark to 8th word of sector0 of page0 of the spare0.
 	 * We write 16 bytes spare area instead of 2 bytes.
+	 * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
+	 * main area of page 49.
 	 */
+
 	from = 0;
-	len = 16;
+	len = FLEXONENAND(this) ? mtd->writesize : 16;
 
-	ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);
+	ret = onenand_otp_walk(mtd, from, len, &retlen, buf, do_otp_lock, MTD_OTP_USER);
 
 	return ret ? : retlen;
 }
@@ -2542,6 +2939,14 @@ static void onenand_check_features(struct mtd_info *mtd)
 		break;
 	}
 
+	if (ONENAND_IS_MLC(this))
+		this->options &= ~ONENAND_HAS_2PLANE;
+
+	if (FLEXONENAND(this)) {
+		this->options &= ~ONENAND_HAS_CONT_LOCK;
+		this->options |= ONENAND_HAS_UNLOCK_ALL;
+	}
+
 	if (this->options & ONENAND_HAS_CONT_LOCK)
 		printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
 	if (this->options & ONENAND_HAS_UNLOCK_ALL)
@@ -2559,14 +2964,16 @@ static void onenand_check_features(struct mtd_info *mtd)
  */
 static void onenand_print_device_info(int device, int version)
 {
-        int vcc, demuxed, ddp, density;
+	int vcc, demuxed, ddp, density, flexonenand;
 
         vcc = device & ONENAND_DEVICE_VCC_MASK;
         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
         ddp = device & ONENAND_DEVICE_IS_DDP;
         density = onenand_get_density(device);
-        printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
-                demuxed ? "" : "Muxed ",
+	flexonenand = device & DEVICE_IS_FLEXONENAND;
+	printk(KERN_INFO "%s%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
+		demuxed ? "" : "Muxed ",
+		flexonenand ? "Flex-" : "",
                 ddp ? "(DDP)" : "",
                 (16 << density),
                 vcc ? "2.65/3.3" : "1.8",
@@ -2576,6 +2983,7 @@ static void onenand_print_device_info(int device, int version)
 
 static const struct onenand_manufacturers onenand_manuf_ids[] = {
         {ONENAND_MFR_SAMSUNG, "Samsung"},
+	{ONENAND_MFR_NUMONYX, "Numonyx"},
 };
 
 /**
@@ -2605,6 +3013,261 @@ static int onenand_check_maf(int manuf)
 }
 
 /**
+* flexonenand_get_boundary	- Reads the SLC boundary
+* @param onenand_info		- onenand info structure
+**/
+static int flexonenand_get_boundary(struct mtd_info *mtd)
+{
+	struct onenand_chip *this = mtd->priv;
+	unsigned die, bdry;
+	int ret, syscfg, locked;
+
+	/* Disable ECC */
+	syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
+	this->write_word((syscfg | 0x0100), this->base + ONENAND_REG_SYS_CFG1);
+
+	for (die = 0; die < this->dies; die++) {
+		this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
+		this->wait(mtd, FL_SYNCING);
+
+		this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
+		ret = this->wait(mtd, FL_READING);
+
+		bdry = this->read_word(this->base + ONENAND_DATARAM);
+		if ((bdry >> FLEXONENAND_PI_UNLOCK_SHIFT) == 3)
+			locked = 0;
+		else
+			locked = 1;
+		this->boundary[die] = bdry & FLEXONENAND_PI_MASK;
+
+		this->command(mtd, ONENAND_CMD_RESET, 0, 0);
+		ret = this->wait(mtd, FL_RESETING);
+
+		printk(KERN_INFO "Die %d boundary: %d%s\n", die,
+		       this->boundary[die], locked ? "(Locked)" : "(Unlocked)");
+	}
+
+	/* Enable ECC */
+	this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
+	return 0;
+}
+
+/**
+ * flexonenand_get_size - Fill up fields in onenand_chip and mtd_info
+ * 			  boundary[], diesize[], mtd->size, mtd->erasesize
+ * @param mtd		- MTD device structure
+ */
+static void flexonenand_get_size(struct mtd_info *mtd)
+{
+	struct onenand_chip *this = mtd->priv;
+	int die, i, eraseshift, density;
+	int blksperdie, maxbdry;
+	loff_t ofs;
+
+	density = onenand_get_density(this->device_id);
+	blksperdie = ((loff_t)(16 << density) << 20) >> (this->erase_shift);
+	blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
+	maxbdry = blksperdie - 1;
+	eraseshift = this->erase_shift - 1;
+
+	mtd->numeraseregions = this->dies << 1;
+
+	/* This fills up the device boundary */
+	flexonenand_get_boundary(mtd);
+	die = ofs = 0;
+	i = -1;
+	for (; die < this->dies; die++) {
+		if (!die || this->boundary[die-1] != maxbdry) {
+			i++;
+			mtd->eraseregions[i].offset = ofs;
+			mtd->eraseregions[i].erasesize = 1 << eraseshift;
+			mtd->eraseregions[i].numblocks =
+							this->boundary[die] + 1;
+			ofs += mtd->eraseregions[i].numblocks << eraseshift;
+			eraseshift++;
+		} else {
+			mtd->numeraseregions -= 1;
+			mtd->eraseregions[i].numblocks +=
+							this->boundary[die] + 1;
+			ofs += (this->boundary[die] + 1) << (eraseshift - 1);
+		}
+		if (this->boundary[die] != maxbdry) {
+			i++;
+			mtd->eraseregions[i].offset = ofs;
+			mtd->eraseregions[i].erasesize = 1 << eraseshift;
+			mtd->eraseregions[i].numblocks = maxbdry ^
+							 this->boundary[die];
+			ofs += mtd->eraseregions[i].numblocks << eraseshift;
+			eraseshift--;
+		} else
+			mtd->numeraseregions -= 1;
+	}
+
+	/* Expose MLC erase size except when all blocks are SLC */
+	mtd->erasesize = 1 << this->erase_shift;
+	if (mtd->numeraseregions == 1)
+		mtd->erasesize >>= 1;
+
+	printk(KERN_INFO "Device has %d eraseregions\n", mtd->numeraseregions);
+	for (i = 0; i < mtd->numeraseregions; i++)
+		printk(KERN_INFO "[offset: 0x%08x, erasesize: 0x%05x,"
+			" numblocks: %04u]\n",
+			(unsigned int) mtd->eraseregions[i].offset,
+			mtd->eraseregions[i].erasesize,
+			mtd->eraseregions[i].numblocks);
+
+	for (die = 0, mtd->size = 0; die < this->dies; die++) {
+		this->diesize[die] = (loff_t)blksperdie << this->erase_shift;
+		this->diesize[die] -= (loff_t)(this->boundary[die] + 1)
+						 << (this->erase_shift - 1);
+		mtd->size += this->diesize[die];
+	}
+}
+
+/**
+ * flexonenand_check_blocks_erased - Check if blocks are erased
+ * @param mtd_info	- mtd info structure
+ * @param start		- first erase block to check
+ * @param end		- last erase block to check
+ *
+ * Converting an unerased block from MLC to SLC
+ * causes byte values to change. Since both data and its ECC
+ * have changed, reads on the block give uncorrectable error.
+ * This might lead to the block being detected as bad.
+ *
+ * Avoid this by ensuring that the block to be converted is
+ * erased.
+ */
+static int flexonenand_check_blocks_erased(struct mtd_info *mtd, int start, int end)
+{
+	struct onenand_chip *this = mtd->priv;
+	int i, ret;
+	int block;
+	struct mtd_oob_ops ops = {
+		.mode = MTD_OOB_PLACE,
+		.ooboffs = 0,
+		.ooblen	= mtd->oobsize,
+		.datbuf	= NULL,
+		.oobbuf	= this->oob_buf,
+	};
+	loff_t addr;
+
+	printk(KERN_DEBUG "Check blocks from %d to %d\n", start, end);
+
+	for (block = start; block <= end; block++) {
+		addr = flexonenand_addr(this, block);
+		if (onenand_block_isbad_nolock(mtd, addr, 0))
+			continue;
+
+		/*
+		 * Since main area write results in ECC write to spare,
+		 * it is sufficient to check only ECC bytes for change.
+		 */
+		ret = onenand_read_oob_nolock(mtd, addr, &ops);
+		if (ret)
+			return ret;
+
+		for (i = 0; i < mtd->oobsize; i++)
+			if (this->oob_buf[i] != 0xff)
+				break;
+
+		if (i != mtd->oobsize) {
+			printk(KERN_WARNING "Block %d not erased.\n", block);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * flexonenand_set_boundary	- Writes the SLC boundary
+ * @param mtd			- mtd info structure
+ */
+int flexonenand_set_boundary(struct mtd_info *mtd, int die,
+				    int boundary, int lock)
+{
+	struct onenand_chip *this = mtd->priv;
+	int ret, density, blksperdie, old, new, thisboundary;
+	loff_t addr;
+
+	/* Change only once for SDP Flex-OneNAND */
+	if (die && (!ONENAND_IS_DDP(this)))
+		return 0;
+
+	/* boundary value of -1 indicates no required change */
+	if (boundary < 0 || boundary == this->boundary[die])
+		return 0;
+
+	density = onenand_get_density(this->device_id);
+	blksperdie = ((16 << density) << 20) >> this->erase_shift;
+	blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
+
+	if (boundary >= blksperdie) {
+		printk(KERN_ERR "flexonenand_set_boundary: Invalid boundary value. "
+				"Boundary not changed.\n");
+		return -EINVAL;
+	}
+
+	/* Check if converting blocks are erased */
+	old = this->boundary[die] + (die * this->density_mask);
+	new = boundary + (die * this->density_mask);
+	ret = flexonenand_check_blocks_erased(mtd, min(old, new) + 1, max(old, new));
+	if (ret) {
+		printk(KERN_ERR "flexonenand_set_boundary: Please erase blocks before boundary change\n");
+		return ret;
+	}
+
+	this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
+	this->wait(mtd, FL_SYNCING);
+
+	/* Check is boundary is locked */
+	this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
+	ret = this->wait(mtd, FL_READING);
+
+	thisboundary = this->read_word(this->base + ONENAND_DATARAM);
+	if ((thisboundary >> FLEXONENAND_PI_UNLOCK_SHIFT) != 3) {
+		printk(KERN_ERR "flexonenand_set_boundary: boundary locked\n");
+		ret = 1;
+		goto out;
+	}
+
+	printk(KERN_INFO "flexonenand_set_boundary: Changing die %d boundary: %d%s\n",
+			die, boundary, lock ? "(Locked)" : "(Unlocked)");
+
+	addr = die ? this->diesize[0] : 0;
+
+	boundary &= FLEXONENAND_PI_MASK;
+	boundary |= lock ? 0 : (3 << FLEXONENAND_PI_UNLOCK_SHIFT);
+
+	this->command(mtd, ONENAND_CMD_ERASE, addr, 0);
+	ret = this->wait(mtd, FL_ERASING);
+	if (ret) {
+		printk(KERN_ERR "flexonenand_set_boundary: Failed PI erase for Die %d\n", die);
+		goto out;
+	}
+
+	this->write_word(boundary, this->base + ONENAND_DATARAM);
+	this->command(mtd, ONENAND_CMD_PROG, addr, 0);
+	ret = this->wait(mtd, FL_WRITING);
+	if (ret) {
+		printk(KERN_ERR "flexonenand_set_boundary: Failed PI write for Die %d\n", die);
+		goto out;
+	}
+
+	this->command(mtd, FLEXONENAND_CMD_PI_UPDATE, die, 0);
+	ret = this->wait(mtd, FL_WRITING);
+out:
+	this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_REG_COMMAND);
+	this->wait(mtd, FL_RESETING);
+	if (!ret)
+		/* Recalculate device size on boundary change*/
+		flexonenand_get_size(mtd);
+
+	return ret;
+}
+
+/**
  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
  * @param mtd		MTD device structure
  *
@@ -2621,7 +3284,7 @@ static int onenand_probe(struct mtd_info *mtd)
 	/* Save system configuration 1 */
 	syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 	/* Clear Sync. Burst Read mode to read BootRAM */
-	this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
+	this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE), this->base + ONENAND_REG_SYS_CFG1);
 
 	/* Send the command for reading device ID from BootRAM */
 	this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
@@ -2646,6 +3309,7 @@ static int onenand_probe(struct mtd_info *mtd)
 	maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
 	dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
 	ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
+	this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
 
 	/* Check OneNAND device */
 	if (maf_id != bram_maf_id || dev_id != bram_dev_id)
@@ -2657,29 +3321,55 @@ static int onenand_probe(struct mtd_info *mtd)
 	this->version_id = ver_id;
 
 	density = onenand_get_density(dev_id);
+	if (FLEXONENAND(this)) {
+		this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
+		/* Maximum possible erase regions */
+		mtd->numeraseregions = this->dies << 1;
+		mtd->eraseregions = kzalloc(sizeof(struct mtd_erase_region_info)
+					* (this->dies << 1), GFP_KERNEL);
+		if (!mtd->eraseregions)
+			return -ENOMEM;
+	}
+
+	/*
+	 * For Flex-OneNAND, chipsize represents maximum possible device size.
+	 * mtd->size represents the actual device size.
+	 */
 	this->chipsize = (16 << density) << 20;
-	/* Set density mask. it is used for DDP */
-	if (ONENAND_IS_DDP(this))
-		this->density_mask = (1 << (density + 6));
-	else
-		this->density_mask = 0;
 
 	/* OneNAND page size & block size */
 	/* The data buffer size is equal to page size */
 	mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
+	/* We use the full BufferRAM */
+	if (ONENAND_IS_MLC(this))
+		mtd->writesize <<= 1;
+
 	mtd->oobsize = mtd->writesize >> 5;
 	/* Pages per a block are always 64 in OneNAND */
 	mtd->erasesize = mtd->writesize << 6;
+	/*
+	 * Flex-OneNAND SLC area has 64 pages per block.
+	 * Flex-OneNAND MLC area has 128 pages per block.
+	 * Expose MLC erase size to find erase_shift and page_mask.
+	 */
+	if (FLEXONENAND(this))
+		mtd->erasesize <<= 1;
 
 	this->erase_shift = ffs(mtd->erasesize) - 1;
 	this->page_shift = ffs(mtd->writesize) - 1;
 	this->page_mask = (1 << (this->erase_shift - this->page_shift)) - 1;
+	/* Set density mask. it is used for DDP */
+	if (ONENAND_IS_DDP(this))
+		this->density_mask = this->chipsize >> (this->erase_shift + 1);
 	/* It's real page size */
 	this->writesize = mtd->writesize;
 
 	/* REVIST: Multichip handling */
 
-	mtd->size = this->chipsize;
+	if (FLEXONENAND(this))
+		flexonenand_get_size(mtd);
+	else
+		mtd->size = this->chipsize;
 
 	/* Check OneNAND features */
 	onenand_check_features(mtd);
@@ -2734,7 +3424,7 @@ static void onenand_resume(struct mtd_info *mtd)
  */
 int onenand_scan(struct mtd_info *mtd, int maxchips)
 {
-	int i;
+	int i, ret;
 	struct onenand_chip *this = mtd->priv;
 
 	if (!this->read_word)
@@ -2746,6 +3436,10 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 		this->command = onenand_command;
 	if (!this->wait)
 		onenand_setup_wait(mtd);
+	if (!this->bbt_wait)
+		this->bbt_wait = onenand_bbt_wait;
+	if (!this->unlock_all)
+		this->unlock_all = onenand_unlock_all;
 
 	if (!this->read_bufferram)
 		this->read_bufferram = onenand_read_bufferram;
@@ -2796,6 +3490,10 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * Allow subpage writes up to oobsize.
 	 */
 	switch (mtd->oobsize) {
+	case 128:
+		this->ecclayout = &onenand_oob_128;
+		mtd->subpage_sft = 0;
+		break;
 	case 64:
 		this->ecclayout = &onenand_oob_64;
 		mtd->subpage_sft = 2;
@@ -2859,9 +3557,18 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	mtd->owner = THIS_MODULE;
 
 	/* Unlock whole block */
-	onenand_unlock_all(mtd);
+	this->unlock_all(mtd);
+
+	ret = this->scan_bbt(mtd);
+	if ((!FLEXONENAND(this)) || ret)
+		return ret;
 
-	return this->scan_bbt(mtd);
+	/* Change Flex-OneNAND boundaries if required */
+	for (i = 0; i < MAX_DIES; i++)
+		flexonenand_set_boundary(mtd, i, flex_bdry[2 * i],
+						 flex_bdry[(2 * i) + 1]);
+
+	return 0;
 }
 
 /**
@@ -2890,6 +3597,7 @@ void onenand_release(struct mtd_info *mtd)
 		kfree(this->page_buf);
 	if (this->options & ONENAND_OOBBUF_ALLOC)
 		kfree(this->oob_buf);
+	kfree(mtd->eraseregions);
 }
 
 EXPORT_SYMBOL_GPL(onenand_scan);