2.6.15

 drivers

 mtd

 onenand

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
new file mode 100644
index 0000000..a53a73f
--- /dev/null
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -0,0 +1,1617 @@
+/*
+ *  linux/drivers/mtd/onenand/onenand_base.c
+ *
+ *  Copyright (C) 2005 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/jiffies.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+
+/**
+ * onenand_oob_64 - oob info for large (2KB) page
+ */
+static struct nand_oobinfo onenand_oob_64 = {
+   .useecc      = MTD_NANDECC_AUTOPLACE,
+   .eccbytes   = 20,
+   .eccpos      = {
+      8, 9, 10, 11, 12,
+      24, 25, 26, 27, 28,
+      40, 41, 42, 43, 44,
+      56, 57, 58, 59, 60,
+      },
+   .oobfree   = {
+      {2, 3}, {14, 2}, {18, 3}, {30, 2},
+      {24, 3}, {46, 2}, {40, 3}, {62, 2} }
+};
+
+/**
+ * onenand_oob_32 - oob info for middle (1KB) page
+ */
+static struct nand_oobinfo onenand_oob_32 = {
+   .useecc      = MTD_NANDECC_AUTOPLACE,
+   .eccbytes   = 10,
+   .eccpos      = {
+      8, 9, 10, 11, 12,
+      24, 25, 26, 27, 28,
+      },
+   .oobfree   = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+};
+
+static const unsigned char ffchars[] = {
+   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,   /* 16 */
+   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,   /* 32 */
+   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+   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 */
+};
+
+/**
+ * onenand_readw - [OneNAND Interface] Read OneNAND register
+ * @param addr      address to read
+ *
+ * Read OneNAND register
+ */
+static unsigned short onenand_readw(void __iomem *addr)
+{
+   return readw(addr);
+}
+
+/**
+ * onenand_writew - [OneNAND Interface] Write OneNAND register with value
+ * @param value      value to write
+ * @param addr      address to write
+ *
+ * Write OneNAND register with value
+ */
+static void onenand_writew(unsigned short value, void __iomem *addr)
+{
+   writew(value, addr);
+}
+
+/**
+ * onenand_block_address - [DEFAULT] Get block address
+ * @param this      onenand chip data structure
+ * @param block      the block
+ * @return      translated block address if DDP, otherwise same
+ *
+ * Setup Start Address 1 Register (F100h)
+ */
+static int onenand_block_address(struct onenand_chip *this, int block)
+{
+   if (this->device_id & ONENAND_DEVICE_IS_DDP) {
+      /* Device Flash Core select, NAND Flash Block Address */
+      int dfs = 0;
+
+      if (block & this->density_mask)
+         dfs = 1;
+
+      return (dfs << ONENAND_DDP_SHIFT) |
+         (block & (this->density_mask - 1));
+   }
+
+   return block;
+}
+
+/**
+ * onenand_bufferram_address - [DEFAULT] Get bufferram address
+ * @param this      onenand chip data structure
+ * @param block      the block
+ * @return      set DBS value if DDP, otherwise 0
+ *
+ * Setup Start Address 2 Register (F101h) for DDP
+ */
+static int onenand_bufferram_address(struct onenand_chip *this, int block)
+{
+   if (this->device_id & ONENAND_DEVICE_IS_DDP) {
+      /* Device BufferRAM Select */
+      int dbs = 0;
+
+      if (block & this->density_mask)
+         dbs = 1;
+
+      return (dbs << ONENAND_DDP_SHIFT);
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_page_address - [DEFAULT] Get page address
+ * @param page      the page address
+ * @param sector   the sector address
+ * @return      combined page and sector address
+ *
+ * Setup Start Address 8 Register (F107h)
+ */
+static int onenand_page_address(int page, int sector)
+{
+   /* Flash Page Address, Flash Sector Address */
+   int fpa, fsa;
+
+   fpa = page & ONENAND_FPA_MASK;
+   fsa = sector & ONENAND_FSA_MASK;
+
+   return ((fpa << ONENAND_FPA_SHIFT) | fsa);
+}
+
+/**
+ * onenand_buffer_address - [DEFAULT] Get buffer address
+ * @param dataram1   DataRAM index
+ * @param sectors   the sector address
+ * @param count      the number of sectors
+ * @return      the start buffer value
+ *
+ * Setup Start Buffer Register (F200h)
+ */
+static int onenand_buffer_address(int dataram1, int sectors, int count)
+{
+   int bsa, bsc;
+
+   /* BufferRAM Sector Address */
+   bsa = sectors & ONENAND_BSA_MASK;
+
+   if (dataram1)
+      bsa |= ONENAND_BSA_DATARAM1;   /* DataRAM1 */
+   else
+      bsa |= ONENAND_BSA_DATARAM0;   /* DataRAM0 */
+
+   /* BufferRAM Sector Count */
+   bsc = count & ONENAND_BSC_MASK;
+
+   return ((bsa << ONENAND_BSA_SHIFT) | bsc);
+}
+
+/**
+ * onenand_command - [DEFAULT] Send command to OneNAND device
+ * @param mtd      MTD device structure
+ * @param cmd      the command to be sent
+ * @param addr      offset to read from or write to
+ * @param len      number of bytes to read or write
+ *
+ * Send command to OneNAND device. This function is used for middle/large page
+ * devices (1KB/2KB Bytes per page)
+ */
+static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
+{
+   struct onenand_chip *this = mtd->priv;
+   int value, readcmd = 0;
+   int block, page;
+   /* Now we use page size operation */
+   int sectors = 4, count = 4;
+
+   /* Address translation */
+   switch (cmd) {
+   case ONENAND_CMD_UNLOCK:
+   case ONENAND_CMD_LOCK:
+   case ONENAND_CMD_LOCK_TIGHT:
+      block = -1;
+      page = -1;
+      break;
+
+   case ONENAND_CMD_ERASE:
+   case ONENAND_CMD_BUFFERRAM:
+      block = (int) (addr >> this->erase_shift);
+      page = -1;
+      break;
+
+   default:
+      block = (int) (addr >> this->erase_shift);
+      page = (int) (addr >> this->page_shift);
+      page &= this->page_mask;
+      break;
+   }
+
+   /* NOTE: The setting order of the registers is very important! */
+   if (cmd == ONENAND_CMD_BUFFERRAM) {
+      /* Select DataRAM for DDP */
+      value = onenand_bufferram_address(this, block);
+      this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+
+      /* Switch to the next data buffer */
+      ONENAND_SET_NEXT_BUFFERRAM(this);
+
+      return 0;
+   }
+
+   if (block != -1) {
+      /* Write 'DFS, FBA' of Flash */
+      value = onenand_block_address(this, block);
+      this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
+   }
+
+   if (page != -1) {
+      int dataram;
+
+      switch (cmd) {
+      case ONENAND_CMD_READ:
+      case ONENAND_CMD_READOOB:
+         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
+         readcmd = 1;
+         break;
+
+      default:
+         dataram = ONENAND_CURRENT_BUFFERRAM(this);
+         break;
+      }
+
+      /* Write 'FPA, FSA' of Flash */
+      value = onenand_page_address(page, sectors);
+      this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
+
+      /* Write 'BSA, BSC' of DataRAM */
+      value = onenand_buffer_address(dataram, sectors, count);
+      this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
+
+      if (readcmd) {
+         /* Select DataRAM for DDP */
+         value = onenand_bufferram_address(this, block);
+         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+      }
+   }
+
+   /* Interrupt clear */
+   this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
+
+   /* Write command */
+   this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
+
+   return 0;
+}
+
+/**
+ * onenand_wait - [DEFAULT] wait until the command is done
+ * @param mtd      MTD device structure
+ * @param state      state to select the max. timeout value
+ *
+ * Wait for command done. This applies to all OneNAND command
+ * Read can take up to 30us, erase up to 2ms and program up to 350us
+ * according to general OneNAND specs
+ */
+static int onenand_wait(struct mtd_info *mtd, int state)
+{
+   struct onenand_chip * this = mtd->priv;
+   unsigned long timeout;
+   unsigned int flags = ONENAND_INT_MASTER;
+   unsigned int interrupt = 0;
+   unsigned int ctrl, ecc;
+
+   /* The 20 msec is enough */
+   timeout = jiffies + msecs_to_jiffies(20);
+   while (time_before(jiffies, timeout)) {
+      interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
+
+      if (interrupt & flags)
+         break;
+
+      if (state != FL_READING)
+         cond_resched();
+   }
+   /* To get correct interrupt status in timeout case */
+   interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
+
+   ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
+
+   if (ctrl & ONENAND_CTRL_ERROR) {
+      /* It maybe occur at initial bad block */
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
+      /* Clear other interrupt bits for preventing ECC error */
+      interrupt &= ONENAND_INT_MASTER;
+   }
+
+   if (ctrl & ONENAND_CTRL_LOCK) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
+      return -EACCES;
+   }
+
+   if (interrupt & ONENAND_INT_READ) {
+      ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
+      if (ecc & ONENAND_ECC_2BIT_ALL) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
+         return -EBADMSG;
+      }
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
+ * @param mtd      MTD data structure
+ * @param area      BufferRAM area
+ * @return      offset given area
+ *
+ * Return BufferRAM offset given area
+ */
+static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
+{
+   struct onenand_chip *this = mtd->priv;
+
+   if (ONENAND_CURRENT_BUFFERRAM(this)) {
+      if (area == ONENAND_DATARAM)
+         return mtd->oobblock;
+      if (area == ONENAND_SPARERAM)
+         return mtd->oobsize;
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
+ * @param mtd      MTD data structure
+ * @param area      BufferRAM area
+ * @param buffer   the databuffer to put/get data
+ * @param offset   offset to read from or write to
+ * @param count      number of bytes to read/write
+ *
+ * Read the BufferRAM area
+ */
+static int onenand_read_bufferram(struct mtd_info *mtd, int area,
+      unsigned char *buffer, int offset, size_t count)
+{
+   struct onenand_chip *this = mtd->priv;
+   void __iomem *bufferram;
+
+   bufferram = this->base + area;
+
+   bufferram += onenand_bufferram_offset(mtd, area);
+
+   memcpy(buffer, bufferram + offset, count);
+
+   return 0;
+}
+
+/**
+ * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
+ * @param mtd      MTD data structure
+ * @param area      BufferRAM area
+ * @param buffer   the databuffer to put/get data
+ * @param offset   offset to read from or write to
+ * @param count      number of bytes to read/write
+ *
+ * Read the BufferRAM area with Sync. Burst Mode
+ */
+static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
+      unsigned char *buffer, int offset, size_t count)
+{
+   struct onenand_chip *this = mtd->priv;
+   void __iomem *bufferram;
+
+   bufferram = this->base + area;
+
+   bufferram += onenand_bufferram_offset(mtd, area);
+
+   this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
+
+   memcpy(buffer, bufferram + offset, count);
+
+   this->mmcontrol(mtd, 0);
+
+   return 0;
+}
+
+/**
+ * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
+ * @param mtd      MTD data structure
+ * @param area      BufferRAM area
+ * @param buffer   the databuffer to put/get data
+ * @param offset   offset to read from or write to
+ * @param count      number of bytes to read/write
+ *
+ * Write the BufferRAM area
+ */
+static int onenand_write_bufferram(struct mtd_info *mtd, int area,
+      const unsigned char *buffer, int offset, size_t count)
+{
+   struct onenand_chip *this = mtd->priv;
+   void __iomem *bufferram;
+
+   bufferram = this->base + area;
+
+   bufferram += onenand_bufferram_offset(mtd, area);
+
+   memcpy(bufferram + offset, buffer, count);
+
+   return 0;
+}
+
+/**
+ * onenand_check_bufferram - [GENERIC] Check BufferRAM information
+ * @param mtd      MTD data structure
+ * @param addr      address to check
+ * @return      1 if there are valid data, otherwise 0
+ *
+ * Check bufferram if there is data we required
+ */
+static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
+{
+   struct onenand_chip *this = mtd->priv;
+   int block, page;
+   int i;
+
+   block = (int) (addr >> this->erase_shift);
+   page = (int) (addr >> this->page_shift);
+   page &= this->page_mask;
+
+   i = ONENAND_CURRENT_BUFFERRAM(this);
+
+   /* Is there valid data? */
+   if (this->bufferram[i].block == block &&
+       this->bufferram[i].page == page &&
+       this->bufferram[i].valid)
+      return 1;
+
+   return 0;
+}
+
+/**
+ * onenand_update_bufferram - [GENERIC] Update BufferRAM information
+ * @param mtd      MTD data structure
+ * @param addr      address to update
+ * @param valid      valid flag
+ *
+ * Update BufferRAM information
+ */
+static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
+      int valid)
+{
+   struct onenand_chip *this = mtd->priv;
+   int block, page;
+   int i;
+
+   block = (int) (addr >> this->erase_shift);
+   page = (int) (addr >> this->page_shift);
+   page &= this->page_mask;
+
+   /* Invalidate BufferRAM */
+   for (i = 0; i < MAX_BUFFERRAM; i++) {
+      if (this->bufferram[i].block == block &&
+          this->bufferram[i].page == page)
+         this->bufferram[i].valid = 0;
+   }
+
+   /* Update BufferRAM */
+   i = ONENAND_CURRENT_BUFFERRAM(this);
+   this->bufferram[i].block = block;
+   this->bufferram[i].page = page;
+   this->bufferram[i].valid = valid;
+
+   return 0;
+}
+
+/**
+ * onenand_get_device - [GENERIC] Get chip for selected access
+ * @param mtd      MTD device structure
+ * @param new_state   the state which is requested
+ *
+ * Get the device and lock it for exclusive access
+ */
+static int onenand_get_device(struct mtd_info *mtd, int new_state)
+{
+   struct onenand_chip *this = mtd->priv;
+   DECLARE_WAITQUEUE(wait, current);
+
+   /*
+    * Grab the lock and see if the device is available
+    */
+   while (1) {
+      spin_lock(&this->chip_lock);
+      if (this->state == FL_READY) {
+         this->state = new_state;
+         spin_unlock(&this->chip_lock);
+         break;
+      }
+      if (new_state == FL_PM_SUSPENDED) {
+         spin_unlock(&this->chip_lock);
+         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
+      }
+      set_current_state(TASK_UNINTERRUPTIBLE);
+      add_wait_queue(&this->wq, &wait);
+      spin_unlock(&this->chip_lock);
+      schedule();
+      remove_wait_queue(&this->wq, &wait);
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_release_device - [GENERIC] release chip
+ * @param mtd      MTD device structure
+ *
+ * Deselect, release chip lock and wake up anyone waiting on the device
+ */
+static void onenand_release_device(struct mtd_info *mtd)
+{
+   struct onenand_chip *this = mtd->priv;
+
+   /* Release the chip */
+   spin_lock(&this->chip_lock);
+   this->state = FL_READY;
+   wake_up(&this->wq);
+   spin_unlock(&this->chip_lock);
+}
+
+/**
+ * onenand_read_ecc - [MTD Interface] Read data with ECC
+ * @param mtd      MTD device structure
+ * @param from      offset to read from
+ * @param len      number of bytes to read
+ * @param retlen   pointer to variable to store the number of read bytes
+ * @param buf      the databuffer to put data
+ * @param oob_buf   filesystem supplied oob data buffer
+ * @param oobsel   oob selection structure
+ *
+ * OneNAND read with ECC
+ */
+static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
+   size_t *retlen, u_char *buf,
+   u_char *oob_buf, struct nand_oobinfo *oobsel)
+{
+   struct onenand_chip *this = mtd->priv;
+   int read = 0, column;
+   int thislen;
+   int ret = 0;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
+
+   /* Do not allow reads past end of device */
+   if ((from + len) > mtd->size) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n");
+      *retlen = 0;
+      return -EINVAL;
+   }
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_READING);
+
+   /* TODO handling oob */
+
+   while (read < len) {
+      thislen = min_t(int, mtd->oobblock, len - read);
+
+      column = from & (mtd->oobblock - 1);
+      if (column + thislen > mtd->oobblock)
+         thislen = mtd->oobblock - column;
+
+      if (!onenand_check_bufferram(mtd, from)) {
+         this->command(mtd, ONENAND_CMD_READ, from, mtd->oobblock);
+
+         ret = this->wait(mtd, FL_READING);
+         /* First copy data and check return value for ECC handling */
+         onenand_update_bufferram(mtd, from, 1);
+      }
+
+      this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
+
+      read += thislen;
+
+      if (read == len)
+         break;
+
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret);
+         goto out;
+      }
+
+      from += thislen;
+      buf += thislen;
+   }
+
+out:
+   /* Deselect and wake up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   /*
+    * Return success, if no ECC failures, else -EBADMSG
+    * fs driver will take care of that, because
+    * retlen == desired len and result == -EBADMSG
+    */
+   *retlen = read;
+   return ret;
+}
+
+/**
+ * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
+ * @param mtd      MTD device structure
+ * @param from      offset to read from
+ * @param len      number of bytes to read
+ * @param retlen   pointer to variable to store the number of read bytes
+ * @param buf      the databuffer to put data
+ *
+ * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
+*/
+static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
+   size_t *retlen, u_char *buf)
+{
+   return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
+}
+
+/**
+ * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
+ * @param mtd      MTD device structure
+ * @param from      offset to read from
+ * @param len      number of bytes to read
+ * @param retlen   pointer to variable to store the number of read bytes
+ * @param buf      the databuffer to put data
+ *
+ * OneNAND read out-of-band data from the spare area
+ */
+static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
+   size_t *retlen, u_char *buf)
+{
+   struct onenand_chip *this = mtd->priv;
+   int read = 0, thislen, column;
+   int ret = 0;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
+
+   /* Initialize return length value */
+   *retlen = 0;
+
+   /* Do not allow reads past end of device */
+   if (unlikely((from + len) > mtd->size)) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
+      return -EINVAL;
+   }
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_READING);
+
+   column = from & (mtd->oobsize - 1);
+
+   while (read < len) {
+      thislen = mtd->oobsize - column;
+      thislen = min_t(int, thislen, len);
+
+      this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
+
+      onenand_update_bufferram(mtd, from, 0);
+
+      ret = this->wait(mtd, FL_READING);
+      /* First copy data and check return value for ECC handling */
+
+      this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
+
+      read += thislen;
+
+      if (read == len)
+         break;
+
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
+         goto out;
+      }
+
+      buf += thislen;
+
+      /* Read more? */
+      if (read < len) {
+         /* Page size */
+         from += mtd->oobblock;
+         column = 0;
+      }
+   }
+
+out:
+   /* Deselect and wake up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   *retlen = read;
+   return ret;
+}
+
+#ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
+/**
+ * onenand_verify_page - [GENERIC] verify the chip contents after a write
+ * @param mtd      MTD device structure
+ * @param buf      the databuffer to verify
+ *
+ * Check DataRAM area directly
+ */
+static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
+{
+   struct onenand_chip *this = mtd->priv;
+   void __iomem *dataram0, *dataram1;
+   int ret = 0;
+
+   this->command(mtd, ONENAND_CMD_READ, addr, mtd->oobblock);
+
+   ret = this->wait(mtd, FL_READING);
+   if (ret)
+      return ret;
+
+   onenand_update_bufferram(mtd, addr, 1);
+
+   /* Check, if the two dataram areas are same */
+   dataram0 = this->base + ONENAND_DATARAM;
+   dataram1 = dataram0 + mtd->oobblock;
+
+   if (memcmp(dataram0, dataram1, mtd->oobblock))
+      return -EBADMSG;
+
+   return 0;
+}
+#else
+#define onenand_verify_page(...)   (0)
+#endif
+
+#define NOTALIGNED(x)   ((x & (mtd->oobblock - 1)) != 0)
+
+/**
+ * onenand_write_ecc - [MTD Interface] OneNAND write with ECC
+ * @param mtd      MTD device structure
+ * @param to      offset to write to
+ * @param len      number of bytes to write
+ * @param retlen   pointer to variable to store the number of written bytes
+ * @param buf      the data to write
+ * @param eccbuf   filesystem supplied oob data buffer
+ * @param oobsel   oob selection structure
+ *
+ * OneNAND write with ECC
+ */
+static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
+   size_t *retlen, const u_char *buf,
+   u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+   struct onenand_chip *this = mtd->priv;
+   int written = 0;
+   int ret = 0;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
+
+   /* Initialize retlen, in case of early exit */
+   *retlen = 0;
+
+   /* Do not allow writes past end of device */
+   if (unlikely((to + len) > mtd->size)) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n");
+      return -EINVAL;
+   }
+
+   /* Reject writes, which are not page aligned */
+        if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
+                DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n");
+                return -EINVAL;
+        }
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_WRITING);
+
+   /* Loop until all data write */
+   while (written < len) {
+      int thislen = min_t(int, mtd->oobblock, len - written);
+
+      this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
+
+      this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
+      this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+
+      this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
+
+      onenand_update_bufferram(mtd, to, 1);
+
+      ret = this->wait(mtd, FL_WRITING);
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret);
+         goto out;
+      }
+
+      written += thislen;
+
+      /* Only check verify write turn on */
+      ret = onenand_verify_page(mtd, (u_char *) buf, to);
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret);
+         goto out;
+      }
+
+      if (written == len)
+         break;
+
+      to += thislen;
+      buf += thislen;
+   }
+
+out:
+   /* Deselect and wake up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   *retlen = written;
+
+   return ret;
+}
+
+/**
+ * onenand_write - [MTD Interface] compability function for onenand_write_ecc
+ * @param mtd      MTD device structure
+ * @param to      offset to write to
+ * @param len      number of bytes to write
+ * @param retlen   pointer to variable to store the number of written bytes
+ * @param buf      the data to write
+ *
+ * This function simply calls onenand_write_ecc
+ * with oob buffer and oobsel = NULL
+ */
+static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
+   size_t *retlen, const u_char *buf)
+{
+   return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL);
+}
+
+/**
+ * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
+ * @param mtd      MTD device structure
+ * @param to      offset to write to
+ * @param len      number of bytes to write
+ * @param retlen   pointer to variable to store the number of written bytes
+ * @param buf      the data to write
+ *
+ * OneNAND write out-of-band
+ */
+static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
+   size_t *retlen, const u_char *buf)
+{
+   struct onenand_chip *this = mtd->priv;
+   int column, status;
+   int written = 0;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
+
+   /* Initialize retlen, in case of early exit */
+   *retlen = 0;
+
+   /* Do not allow writes past end of device */
+   if (unlikely((to + len) > mtd->size)) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
+      return -EINVAL;
+   }
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_WRITING);
+
+   /* Loop until all data write */
+   while (written < len) {
+      int thislen = min_t(int, mtd->oobsize, len - written);
+
+      column = to & (mtd->oobsize - 1);
+
+      this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
+
+      this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+      this->write_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
+
+      this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
+
+      onenand_update_bufferram(mtd, to, 0);
+
+      status = this->wait(mtd, FL_WRITING);
+      if (status)
+         goto out;
+
+      written += thislen;
+
+      if (written == len)
+         break;
+
+      to += thislen;
+      buf += thislen;
+   }
+
+out:
+   /* Deselect and wake up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   *retlen = written;
+
+   return 0;
+}
+
+/**
+ * onenand_writev_ecc - [MTD Interface] write with iovec with ecc
+ * @param mtd      MTD device structure
+ * @param vecs      the iovectors to write
+ * @param count      number of vectors
+ * @param to      offset to write to
+ * @param retlen   pointer to variable to store the number of written bytes
+ * @param eccbuf   filesystem supplied oob data buffer
+ * @param oobsel   oob selection structure
+ *
+ * OneNAND write with iovec with ecc
+ */
+static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
+   unsigned long count, loff_t to, size_t *retlen,
+   u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+   struct onenand_chip *this = mtd->priv;
+   unsigned char *pbuf;
+   size_t total_len, len;
+   int i, written = 0;
+   int ret = 0;
+
+   /* Preset written len for early exit */
+   *retlen = 0;
+
+   /* Calculate total length of data */
+   total_len = 0;
+   for (i = 0; i < count; i++)
+      total_len += vecs[i].iov_len;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len,+
 count);
+
+   /* Do not allow write past end of the device */
+   if (unlikely((to + total_len) > mtd->size)) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write past end of device\n");
+      return -EINVAL;
+   }
+
+   /* Reject writes, which are not page aligned */
+        if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(total_len))) {
+                DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempt to write not page aligned data\n");
+                return -EINVAL;
+        }
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_WRITING);
+
+   /* TODO handling oob */
+
+   /* Loop until all keve's data has been written */
+   len = 0;
+   while (count) {
+      pbuf = this->page_buf;
+      /*
+       * If the given tuple is >= pagesize then
+       * write it out from the iov
+       */
+      if ((vecs->iov_len - len) >= mtd->oobblock) {
+         pbuf = vecs->iov_base + len;
+
+         len += mtd->oobblock;
+
+         /* Check, if we have to switch to the next tuple */
+         if (len >= (int) vecs->iov_len) {
+            vecs++;
+            len = 0;
+            count--;
+         }
+      } else {
+         int cnt = 0, thislen;
+         while (cnt < mtd->oobblock) {
+            thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len);
+            memcpy(this->page_buf + cnt, vecs->iov_base + len, thislen);
+            cnt += thislen;
+            len += thislen;
+
+            /* Check, if we have to switch to the next tuple */
+            if (len >= (int) vecs->iov_len) {
+               vecs++;
+               len = 0;
+               count--;
+            }
+         }
+      }
+
+      this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
+
+      this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock);
+      this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+
+      this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
+
+      onenand_update_bufferram(mtd, to, 1);
+
+      ret = this->wait(mtd, FL_WRITING);
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
+         goto out;
+      }
+
+
+      /* Only check verify write turn on */
+      ret = onenand_verify_page(mtd, (u_char *) pbuf, to);
+      if (ret) {
+         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
+         goto out;
+      }
+
+      written += mtd->oobblock;
+
+      to += mtd->oobblock;
+   }
+
+out:
+   /* Deselect and wakt up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   *retlen = written;
+
+   return 0;
+}
+
+/**
+ * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
+ * @param mtd      MTD device structure
+ * @param vecs      the iovectors to write
+ * @param count      number of vectors
+ * @param to      offset to write to
+ * @param retlen   pointer to variable to store the number of written bytes
+ *
+ * OneNAND write with kvec. This just calls the ecc function
+ */
+static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
+   unsigned long count, loff_t to, size_t *retlen)
+{
+   return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
+}
+
+/**
+ * onenand_block_checkbad - [GENERIC] Check if a block is marked bad
+ * @param mtd      MTD device structure
+ * @param ofs      offset from device start
+ * @param getchip   0, if the chip is already selected
+ * @param allowbbt   1, if its allowed to access the bbt area
+ *
+ * Check, if the block is bad. Either by reading the bad block table or
+ * calling of the scan function.
+ */
+static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
+{
+   struct onenand_chip *this = mtd->priv;
+   struct bbm_info *bbm = this->bbm;
+
+   /* Return info from the table */
+   return bbm->isbad_bbt(mtd, ofs, allowbbt);
+}
+
+/**
+ * onenand_erase - [MTD Interface] erase block(s)
+ * @param mtd      MTD device structure
+ * @param instr      erase instruction
+ *
+ * Erase one ore more blocks
+ */
+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;
+
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len+
);
+
+   block_size = (1 << this->erase_shift);
+
+   /* Start address must align on block boundary */
+   if (unlikely(instr->addr & (block_size - 1))) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
+      return -EINVAL;
+   }
+
+   /* Length must align on block boundary */
+   if (unlikely(instr->len & (block_size - 1))) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
+      return -EINVAL;
+   }
+
+   /* Do not allow erase past end of device */
+   if (unlikely((instr->len + instr->addr) > mtd->size)) {
+      DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
+      return -EINVAL;
+   }
+
+   instr->fail_addr = 0xffffffff;
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_ERASING);
+
+   /* Loop throught the pages */
+   len = instr->len;
+   addr = instr->addr;
+
+   instr->state = MTD_ERASING;
+
+   while (len) {
+
+      /* Check if we have a bad block, we do not erase bad blocks */
+      if (onenand_block_checkbad(mtd, addr, 0, 0)) {
+         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
+         instr->state = MTD_ERASE_FAILED;
+         goto erase_exit;
+      }
+
+      this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
+
+      ret = this->wait(mtd, FL_ERASING);
+      /* Check, if it is write protected */
+      if (ret) {
+         if (ret == -EPERM)
+            DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
+         else
+            DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
+         instr->state = MTD_ERASE_FAILED;
+         instr->fail_addr = addr;
+         goto erase_exit;
+      }
+
+      len -= block_size;
+      addr += block_size;
+   }
+
+   instr->state = MTD_ERASE_DONE;
+
+erase_exit:
+
+   ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
+   /* Do call back function */
+   if (!ret)
+      mtd_erase_callback(instr);
+
+   /* Deselect and wake up anyone waiting on the device */
+   onenand_release_device(mtd);
+
+   return ret;
+}
+
+/**
+ * onenand_sync - [MTD Interface] sync
+ * @param mtd      MTD device structure
+ *
+ * Sync is actually a wait for chip ready function
+ */
+static void onenand_sync(struct mtd_info *mtd)
+{
+   DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
+
+   /* Grab the lock and see if the device is available */
+   onenand_get_device(mtd, FL_SYNCING);
+
+   /* Release it and go back */
+   onenand_release_device(mtd);
+}
+
+
+/**
+ * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
+ * @param mtd      MTD device structure
+ * @param ofs      offset relative to mtd start
+ *
+ * Check whether the block is bad
+ */
+static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+   /* Check for invalid offset */
+   if (ofs > mtd->size)
+      return -EINVAL;
+
+   return onenand_block_checkbad(mtd, ofs, 1, 0);
+}
+
+/**
+ * onenand_default_block_markbad - [DEFAULT] mark a block bad
+ * @param mtd      MTD device structure
+ * @param ofs      offset from device start
+ *
+ * This is the default implementation, which can be overridden by
+ * a hardware specific driver.
+ */
+static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+   struct onenand_chip *this = mtd->priv;
+   struct bbm_info *bbm = this->bbm;
+   u_char buf[2] = {0, 0};
+   size_t retlen;
+   int block;
+
+   /* Get block number */
+   block = ((int) ofs) >> bbm->bbt_erase_shift;
+        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 mtd->write_oob(mtd, ofs , 2, &retlen, buf);
+}
+
+/**
+ * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
+ * @param mtd      MTD device structure
+ * @param ofs      offset relative to mtd start
+ *
+ * Mark the block as bad
+ */
+static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+   struct onenand_chip *this = mtd->priv;
+   int ret;
+
+   ret = onenand_block_isbad(mtd, ofs);
+   if (ret) {
+      /* If it was bad already, return success and do nothing */
+      if (ret > 0)
+         return 0;
+      return ret;
+   }
+
+   return this->block_markbad(mtd, ofs);
+}
+
+/**
+ * onenand_unlock - [MTD Interface] Unlock block(s)
+ * @param mtd      MTD device structure
+ * @param ofs      offset relative to mtd start
+ * @param len      number of bytes to unlock
+ *
+ * Unlock one or more blocks
+ */
+static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+   struct onenand_chip *this = mtd->priv;
+   int start, end, block, value, status;
+
+   start = ofs >> this->erase_shift;
+   end = len >> this->erase_shift;
+
+   /* Continuous lock scheme */
+   if (this->options & ONENAND_CONT_LOCK) {
+      /* Set start block address */
+      this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
+      /* Set end block address */
+      this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
+      /* Write unlock command */
+      this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
+
+      /* There's no return value */
+      this->wait(mtd, FL_UNLOCKING);
+
+      /* Sanity check */
+      while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
+          & ONENAND_CTRL_ONGO)
+         continue;
+
+      /* Check lock status */
+      status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
+      if (!(status & ONENAND_WP_US))
+         printk(KERN_ERR "wp status = 0x%x\n", status);
+
+      return 0;
+   }
+
+   /* Block lock scheme */
+   for (block = start; block < end; block++) {
+      /* Set block address */
+      value = onenand_block_address(this, block);
+      this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
+      /* Select DataRAM for DDP */
+      value = onenand_bufferram_address(this, block);
+      this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
+      /* Set start block address */
+      this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
+      /* Write unlock command */
+      this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
+
+      /* There's no return value */
+      this->wait(mtd, FL_UNLOCKING);
+
+      /* Sanity check */
+      while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
+          & ONENAND_CTRL_ONGO)
+         continue;
+
+      /* Check lock status */
+      status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
+      if (!(status & ONENAND_WP_US))
+         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_print_device_info - Print device ID
+ * @param device        device ID
+ *
+ * Print device ID
+ */
+static void onenand_print_device_info(int device)
+{
+        int vcc, demuxed, ddp, density;
+
+        vcc = device & ONENAND_DEVICE_VCC_MASK;
+        demuxed = device & ONENAND_DEVICE_IS_DEMUX;
+        ddp = device & ONENAND_DEVICE_IS_DDP;
+        density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
+        printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
+                demuxed ? "" : "Muxed ",
+                ddp ? "(DDP)" : "",
+                (16 << density),
+                vcc ? "2.65/3.3" : "1.8",
+                device);
+}
+
+static const struct onenand_manufacturers onenand_manuf_ids[] = {
+        {ONENAND_MFR_SAMSUNG, "Samsung"},
+};
+
+/**
+ * onenand_check_maf - Check manufacturer ID
+ * @param manuf         manufacturer ID
+ *
+ * Check manufacturer ID
+ */
+static int onenand_check_maf(int manuf)
+{
+   int size = ARRAY_SIZE(onenand_manuf_ids);
+   char *name;
+        int i;
+
+   for (i = 0; i < size; i++)
+                if (manuf == onenand_manuf_ids[i].id)
+                        break;
+
+   if (i < size)
+      name = onenand_manuf_ids[i].name;
+   else
+      name = "Unknown";
+
+   printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
+
+   return (i == size);
+}
+
+/**
+ * onenand_probe - [OneNAND Interface] Probe the OneNAND device
+ * @param mtd      MTD device structure
+ *
+ * OneNAND detection method:
+ *   Compare the the values from command with ones from register
+ */
+static int onenand_probe(struct mtd_info *mtd)
+{
+   struct onenand_chip *this = mtd->priv;
+   int bram_maf_id, bram_dev_id, maf_id, dev_id;
+   int version_id;
+   int density;
+
+   /* Send the command for reading device ID from BootRAM */
+   this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
+
+   /* Read manufacturer and device IDs from BootRAM */
+   bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
+   bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
+
+   /* Check manufacturer ID */
+   if (onenand_check_maf(bram_maf_id))
+      return -ENXIO;
+
+   /* Reset OneNAND to read default register values */
+   this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
+
+   /* Read manufacturer and device IDs from Register */
+   maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
+   dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
+
+   /* Check OneNAND device */
+   if (maf_id != bram_maf_id || dev_id != bram_dev_id)
+      return -ENXIO;
+
+   /* Flash device information */
+   onenand_print_device_info(dev_id);
+   this->device_id = dev_id;
+
+   density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
+   this->chipsize = (16 << density) << 20;
+   /* Set density mask. it is used for DDP */
+   this->density_mask = (1 << (density + 6));
+
+   /* OneNAND page size & block size */
+   /* The data buffer size is equal to page size */
+   mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
+   mtd->oobsize = mtd->oobblock >> 5;
+   /* Pagers per block is always 64 in OneNAND */
+   mtd->erasesize = mtd->oobblock << 6;
+
+   this->erase_shift = ffs(mtd->erasesize) - 1;
+   this->page_shift = ffs(mtd->oobblock) - 1;
+   this->ppb_shift = (this->erase_shift - this->page_shift);
+   this->page_mask = (mtd->erasesize / mtd->oobblock) - 1;
+
+   /* REVIST: Multichip handling */
+
+   mtd->size = this->chipsize;
+
+   /* Version ID */
+   version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
+   printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
+
+   /* Lock scheme */
+   if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
+       !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
+      printk(KERN_INFO "Lock scheme is Continues Lock\n");
+      this->options |= ONENAND_CONT_LOCK;
+   }
+
+   return 0;
+}
+
+/**
+ * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
+ * @param mtd      MTD device structure
+ */
+static int onenand_suspend(struct mtd_info *mtd)
+{
+   return onenand_get_device(mtd, FL_PM_SUSPENDED);
+}
+
+/**
+ * onenand_resume - [MTD Interface] Resume the OneNAND flash
+ * @param mtd      MTD device structure
+ */
+static void onenand_resume(struct mtd_info *mtd)
+{
+   struct onenand_chip *this = mtd->priv;
+
+   if (this->state == FL_PM_SUSPENDED)
+      onenand_release_device(mtd);
+   else
+      printk(KERN_ERR "resume() called for the chip which is not"
+            "in suspended state\n");
+}
+
+
+/**
+ * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
+ * @param mtd      MTD device structure
+ * @param maxchips   Number of chips to scan for
+ *
+ * This fills out all the not initialized function pointers
+ * with the defaults.
+ * The flash ID is read and the mtd/chip structures are
+ * filled with the appropriate values.
+ */
+int onenand_scan(struct mtd_info *mtd, int maxchips)
+{
+   struct onenand_chip *this = mtd->priv;
+
+   if (!this->read_word)
+      this->read_word = onenand_readw;
+   if (!this->write_word)
+      this->write_word = onenand_writew;
+
+   if (!this->command)
+      this->command = onenand_command;
+   if (!this->wait)
+      this->wait = onenand_wait;
+
+   if (!this->read_bufferram)
+      this->read_bufferram = onenand_read_bufferram;
+   if (!this->write_bufferram)
+      this->write_bufferram = onenand_write_bufferram;
+
+   if (!this->block_markbad)
+      this->block_markbad = onenand_default_block_markbad;
+   if (!this->scan_bbt)
+      this->scan_bbt = onenand_default_bbt;
+
+   if (onenand_probe(mtd))
+      return -ENXIO;
+
+   /* Set Sync. Burst Read after probing */
+   if (this->mmcontrol) {
+      printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
+      this->read_bufferram = onenand_sync_read_bufferram;
+   }
+
+   /* Allocate buffers, if necessary */
+   if (!this->page_buf) {
+      size_t len;
+      len = mtd->oobblock + mtd->oobsize;
+      this->page_buf = kmalloc(len, GFP_KERNEL);
+      if (!this->page_buf) {
+         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
+         return -ENOMEM;
+      }
+      this->options |= ONENAND_PAGEBUF_ALLOC;
+   }
+
+   this->state = FL_READY;
+   init_waitqueue_head(&this->wq);
+   spin_lock_init(&this->chip_lock);
+
+   switch (mtd->oobsize) {
+   case 64:
+      this->autooob = &onenand_oob_64;
+      break;
+
+   case 32:
+      this->autooob = &onenand_oob_32;
+      break;
+
+   default:
+      printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
+         mtd->oobsize);
+      /* To prevent kernel oops */
+      this->autooob = &onenand_oob_32;
+      break;
+   }
+
+   memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
+
+   /* Fill in remaining MTD driver data */
+   mtd->type = MTD_NANDFLASH;
+   mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
+   mtd->ecctype = MTD_ECC_SW;
+   mtd->erase = onenand_erase;
+   mtd->point = NULL;
+   mtd->unpoint = NULL;
+   mtd->read = onenand_read;
+   mtd->write = onenand_write;
+   mtd->read_ecc = onenand_read_ecc;
+   mtd->write_ecc = onenand_write_ecc;
+   mtd->read_oob = onenand_read_oob;
+   mtd->write_oob = onenand_write_oob;
+   mtd->readv = NULL;
+   mtd->readv_ecc = NULL;
+   mtd->writev = onenand_writev;
+   mtd->writev_ecc = onenand_writev_ecc;
+   mtd->sync = onenand_sync;
+   mtd->lock = NULL;
+   mtd->unlock = onenand_unlock;
+   mtd->suspend = onenand_suspend;
+   mtd->resume = onenand_resume;
+   mtd->block_isbad = onenand_block_isbad;
+   mtd->block_markbad = onenand_block_markbad;
+   mtd->owner = THIS_MODULE;
+
+   /* Unlock whole block */
+   mtd->unlock(mtd, 0x0, this->chipsize);
+
+   return this->scan_bbt(mtd);
+}
+
+/**
+ * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
+ * @param mtd      MTD device structure
+ */
+void onenand_release(struct mtd_info *mtd)
+{
+   struct onenand_chip *this = mtd->priv;
+
+#ifdef CONFIG_MTD_PARTITIONS
+   /* Deregister partitions */
+   del_mtd_partitions (mtd);
+#endif
+   /* Deregister the device */
+   del_mtd_device (mtd);
+
+   /* Free bad block table memory, if allocated */
+   if (this->bbm)
+      kfree(this->bbm);
+   /* Buffer allocated by onenand_scan */
+   if (this->options & ONENAND_PAGEBUF_ALLOC)
+      kfree(this->page_buf);
+}
+
+EXPORT_SYMBOL_GPL(onenand_scan);
+EXPORT_SYMBOL_GPL(onenand_release);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_DESCRIPTION("Generic OneNAND flash driver code");