3 files changed, 867 insertions, 85 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 2346857a275d..8d4c9c253732 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.
@@ -27,6 +31,30 @@
 
 #include <asm/io.h>
 
+/* Default Flex-OneNAND boundary and lock respectively */
+static int flex_bdry[MAX_DIES * 2] = { -1, 0, -1, 0 };
+
+/**
+ *  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 +93,14 @@ 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 +207,70 @@ 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 +283,22 @@ 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 +323,28 @@ 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 +364,7 @@ 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 +386,18 @@ 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 +426,30 @@ 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 +488,14 @@ 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 +813,7 @@ 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 +973,149 @@ 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 +1262,7 @@ 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 +1293,22 @@ 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 +1358,7 @@ 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 +1368,9 @@ 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 +1388,7 @@ 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 +1403,9 @@ 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 +1439,11 @@ 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 +1474,7 @@ 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 +1494,22 @@ 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);
+                if (unlikely(ret))
+                        ret = onenand_recover_lsb(mtd, from, ret);
+
                 if (ret)
                         break;
 
@@ -1230,9 +1546,11 @@ 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;
+
+        readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
 
-        this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
+        this->command(mtd, readcmd, to, mtd->oobsize);
         onenand_update_bufferram(mtd, to, 0);
         status = this->wait(mtd, FL_READING);
         if (status)
@@ -1633,7 +1951,7 @@ 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 +1993,8 @@ 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 +2012,14 @@ 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 +2142,48 @@ 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 +2193,6 @@ 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 +2212,8 @@ 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 +2221,22 @@ 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 +2315,17 @@ 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 +2369,8 @@ 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 +2382,7 @@ 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 +2403,7 @@ 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 +2511,7 @@ 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 */
@@ -2168,7 +2532,7 @@ static void onenand_unlock_all(struct mtd_info *mtd)
                         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 +2574,9 @@ 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 +2643,32 @@ 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 +2852,34 @@ 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 +2926,14 @@ 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 +2951,16 @@ 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",
@@ -2606,6 +3000,280 @@ 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;
+}
+
+/**
+ * flexonenand_setup -  capture Flex-OneNAND boundary and lock
+ *                      values  passed as kernel parameters
+ * @param s     kernel parameter string
+ */
+static int flexonenand_setup(char *s)
+{
+        int ints[5], i;
+
+        s = get_options(s, 5, ints);
+
+        for (i = 0; i < ints[0]; i++)
+                flex_bdry[i] = ints[i + 1];
+
+        return 1;
+}
+
+__setup("onenand.bdry=", flexonenand_setup);
+
+/**
  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
  * @param mtd           MTD device structure
  *
@@ -2647,6 +3315,7 @@ 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)
@@ -2658,29 +3327,55 @@ 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);
@@ -2735,7 +3430,7 @@ 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)
@@ -2797,6 +3492,10 @@ 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;
@@ -2862,7 +3561,16 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
         /* Unlock whole block */
         onenand_unlock_all(mtd);
 
-        return this->scan_bbt(mtd);
+        ret = this->scan_bbt(mtd);
+        if ((!FLEXONENAND(this)) || ret)
+                return ret;
+
+        /* 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;
 }
 
 /**
@@ -2891,6 +3599,7 @@ 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);
diff --git a/drivers/mtd/onenand/onenand_bbt.c b/drivers/mtd/onenand/onenand_bbt.c
index 2f53b51c6805..a91fcac1af01 100644
--- a/drivers/mtd/onenand/onenand_bbt.c
+++ b/drivers/mtd/onenand/onenand_bbt.c
@@ -63,6 +63,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
         loff_t from;
         size_t readlen, ooblen;
         struct mtd_oob_ops ops;
+        int rgn;
 
         printk(KERN_INFO "Scanning device for bad blocks\n");
 
@@ -76,7 +77,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
         /* Note that numblocks is 2 * (real numblocks) here;
          * see i += 2 below as it makses shifting and masking less painful
          */
-        numblocks = mtd->size >> (bbm->bbt_erase_shift - 1);
+        numblocks = this->chipsize >> (bbm->bbt_erase_shift - 1);
         startblock = 0;
         from = 0;
 
@@ -106,7 +107,12 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
                         }
                 }
                 i += 2;
-                from += (1 << bbm->bbt_erase_shift);
+
+                if (FLEXONENAND(this)) {
+                        rgn = flexonenand_region(mtd, from);
+                        from += mtd->eraseregions[rgn].erasesize;
+                } else
+                        from += (1 << bbm->bbt_erase_shift);
         }
 
         return 0;
@@ -143,7 +149,7 @@ static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
         uint8_t res;
 
         /* Get block number * 2 */
-        block = (int) (offs >> (bbm->bbt_erase_shift - 1));
+        block = (int) (onenand_block(this, offs) << 1);
         res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03;
 
         DEBUG(MTD_DEBUG_LEVEL2, "onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n",
@@ -178,7 +184,7 @@ int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
         struct bbm_info *bbm = this->bbm;
         int len, ret = 0;
 
-        len = mtd->size >> (this->erase_shift + 2);
+        len = this->chipsize >> (this->erase_shift + 2);
         /* Allocate memory (2bit per block) and clear the memory bad block table */
         bbm->bbt = kzalloc(len, GFP_KERNEL);
         if (!bbm->bbt) {
diff --git a/drivers/mtd/onenand/onenand_sim.c b/drivers/mtd/onenand/onenand_sim.c
index d64200b7c94b..f6e3c8aebd3a 100644
--- a/drivers/mtd/onenand/onenand_sim.c
+++ b/drivers/mtd/onenand/onenand_sim.c
@@ -6,6 +6,10 @@
  *  Copyright © 2005-2007 Samsung Electronics
  *  Kyungmin Park <kyungmin.park@samsung.com>
  *
+ *  Vishak G <vishak.g at samsung.com>, Rohit Hagargundgi <h.rohit at samsung.com>
+ *  Flex-OneNAND simulator 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.
@@ -24,16 +28,38 @@
 #ifndef CONFIG_ONENAND_SIM_MANUFACTURER
 #define CONFIG_ONENAND_SIM_MANUFACTURER         0xec
 #endif
+
 #ifndef CONFIG_ONENAND_SIM_DEVICE_ID
 #define CONFIG_ONENAND_SIM_DEVICE_ID            0x04
 #endif
+
+#define CONFIG_FLEXONENAND ((CONFIG_ONENAND_SIM_DEVICE_ID >> 9) & 1)
+
 #ifndef CONFIG_ONENAND_SIM_VERSION_ID
 #define CONFIG_ONENAND_SIM_VERSION_ID           0x1e
 #endif
 
+#ifndef CONFIG_ONENAND_SIM_TECHNOLOGY_ID
+#define CONFIG_ONENAND_SIM_TECHNOLOGY_ID CONFIG_FLEXONENAND
+#endif
+
+/* Initial boundary values for Flex-OneNAND Simulator */
+#ifndef CONFIG_FLEXONENAND_SIM_DIE0_BOUNDARY
+#define CONFIG_FLEXONENAND_SIM_DIE0_BOUNDARY    0x01
+#endif
+
+#ifndef CONFIG_FLEXONENAND_SIM_DIE1_BOUNDARY
+#define CONFIG_FLEXONENAND_SIM_DIE1_BOUNDARY    0x01
+#endif
+
 static int manuf_id     = CONFIG_ONENAND_SIM_MANUFACTURER;
 static int device_id    = CONFIG_ONENAND_SIM_DEVICE_ID;
 static int version_id   = CONFIG_ONENAND_SIM_VERSION_ID;
+static int technology_id = CONFIG_ONENAND_SIM_TECHNOLOGY_ID;
+static int boundary[] = {
+        CONFIG_FLEXONENAND_SIM_DIE0_BOUNDARY,
+        CONFIG_FLEXONENAND_SIM_DIE1_BOUNDARY,
+};
 
 struct onenand_flash {
         void __iomem *base;
@@ -57,12 +83,18 @@ struct onenand_flash {
         (writew(v, this->base + ONENAND_REG_WP_STATUS))
 
 /* It has all 0xff chars */
-#define MAX_ONENAND_PAGESIZE            (2048 + 64)
+#define MAX_ONENAND_PAGESIZE            (4096 + 128)
 static unsigned char *ffchars;
 
+#if CONFIG_FLEXONENAND
+#define PARTITION_NAME "Flex-OneNAND simulator partition"
+#else
+#define PARTITION_NAME "OneNAND simulator partition"
+#endif
+
 static struct mtd_partition os_partitions[] = {
         {
-                .name           = "OneNAND simulator partition",
+                .name           = PARTITION_NAME,
                 .offset         = 0,
                 .size           = MTDPART_SIZ_FULL,
         },
@@ -104,6 +136,7 @@ static void onenand_lock_handle(struct onenand_chip *this, int cmd)
 
         switch (cmd) {
         case ONENAND_CMD_UNLOCK:
+        case ONENAND_CMD_UNLOCK_ALL:
                 if (block_lock_scheme)
                         ONENAND_SET_WP_STATUS(ONENAND_WP_US, this);
                 else
@@ -228,10 +261,12 @@ static void onenand_data_handle(struct onenand_chip *this, int cmd,
 {
         struct mtd_info *mtd = &info->mtd;
         struct onenand_flash *flash = this->priv;
-        int main_offset, spare_offset;
+        int main_offset, spare_offset, die = 0;
         void __iomem *src;
         void __iomem *dest;
         unsigned int i;
+        static int pi_operation;
+        int erasesize, rgn;
 
         if (dataram) {
                 main_offset = mtd->writesize;
@@ -241,10 +276,27 @@ static void onenand_data_handle(struct onenand_chip *this, int cmd,
                 spare_offset = 0;
         }
 
+        if (pi_operation) {
+                die = readw(this->base + ONENAND_REG_START_ADDRESS2);
+                die >>= ONENAND_DDP_SHIFT;
+        }
+
         switch (cmd) {
+        case FLEXONENAND_CMD_PI_ACCESS:
+                pi_operation = 1;
+                break;
+
+        case ONENAND_CMD_RESET:
+                pi_operation = 0;
+                break;
+
         case ONENAND_CMD_READ:
                 src = ONENAND_CORE(flash) + offset;
                 dest = ONENAND_MAIN_AREA(this, main_offset);
+                if (pi_operation) {
+                        writew(boundary[die], this->base + ONENAND_DATARAM);
+                        break;
+                }
                 memcpy(dest, src, mtd->writesize);
                 /* Fall through */
 
@@ -257,6 +309,10 @@ static void onenand_data_handle(struct onenand_chip *this, int cmd,
         case ONENAND_CMD_PROG:
                 src = ONENAND_MAIN_AREA(this, main_offset);
                 dest = ONENAND_CORE(flash) + offset;
+                if (pi_operation) {
+                        boundary[die] = readw(this->base + ONENAND_DATARAM);
+                        break;
+                }
                 /* To handle partial write */
                 for (i = 0; i < (1 << mtd->subpage_sft); i++) {
                         int off = i * this->subpagesize;
@@ -284,9 +340,18 @@ static void onenand_data_handle(struct onenand_chip *this, int cmd,
                 break;
 
         case ONENAND_CMD_ERASE:
-                memset(ONENAND_CORE(flash) + offset, 0xff, mtd->erasesize);
+                if (pi_operation)
+                        break;
+
+                if (FLEXONENAND(this)) {
+                        rgn = flexonenand_region(mtd, offset);
+                        erasesize = mtd->eraseregions[rgn].erasesize;
+                } else
+                        erasesize = mtd->erasesize;
+
+                memset(ONENAND_CORE(flash) + offset, 0xff, erasesize);
                 memset(ONENAND_CORE_SPARE(flash, this, offset), 0xff,
-                       (mtd->erasesize >> 5));
+                       (erasesize >> 5));
                 break;
 
         default:
@@ -339,7 +404,7 @@ static void onenand_command_handle(struct onenand_chip *this, int cmd)
         }
 
         if (block != -1)
-                offset += block << this->erase_shift;
+                offset = onenand_addr(this, block);
 
         if (page != -1)
                 offset += page << this->page_shift;
@@ -390,6 +455,7 @@ static int __init flash_init(struct onenand_flash *flash)
         }
 
         density = device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
+        density &= ONENAND_DEVICE_DENSITY_MASK;
         size = ((16 << 20) << density);
 
         ONENAND_CORE(flash) = vmalloc(size + (size >> 5));
@@ -405,8 +471,9 @@ static int __init flash_init(struct onenand_flash *flash)
         writew(manuf_id, flash->base + ONENAND_REG_MANUFACTURER_ID);
         writew(device_id, flash->base + ONENAND_REG_DEVICE_ID);
         writew(version_id, flash->base + ONENAND_REG_VERSION_ID);
+        writew(technology_id, flash->base + ONENAND_REG_TECHNOLOGY);
 
-        if (density < 2)
+        if (density < 2 && (!CONFIG_FLEXONENAND))
                 buffer_size = 0x0400;   /* 1KiB page */
         else
                 buffer_size = 0x0800;   /* 2KiB page */