Update of new NAND code

Patch by Ladislav Michl, 13 Sep 2005

1 files changed, 121 insertions, 121 deletions

diff --git a/drivers/nand/nand_bbt.c b/drivers/nand/nand_bbt.c
index 6f7e05b7eb6..dfa88a3af6f 100644
--- a/drivers/nand/nand_bbt.c
+++ b/drivers/nand/nand_bbt.c
@@ -3,7 +3,7 @@
  *
  *  Overview:
  *   Bad block table support for the NAND driver
- *   
+ *
  *  Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
  *
  * $Id: nand_bbt.c,v 1.28 2004/11/13 10:19:09 gleixner Exp $
@@ -14,23 +14,23 @@
  *
  * Description:
  *
- * When nand_scan_bbt is called, then it tries to find the bad block table 
- * depending on the options in the bbt descriptor(s). If a bbt is found 
- * then the contents are read and the memory based bbt is created. If a 
+ * When nand_scan_bbt is called, then it tries to find the bad block table
+ * depending on the options in the bbt descriptor(s). If a bbt is found
+ * then the contents are read and the memory based bbt is created. If a
  * mirrored bbt is selected then the mirror is searched too and the
- * versions are compared. If the mirror has a greater version number 
+ * versions are compared. If the mirror has a greater version number
  * than the mirror bbt is used to build the memory based bbt.
  * If the tables are not versioned, then we "or" the bad block information.
- * If one of the bbt's is out of date or does not exist it is (re)created. 
- * If no bbt exists at all then the device is scanned for factory marked 
- * good / bad blocks and the bad block tables are created. 
+ * If one of the bbt's is out of date or does not exist it is (re)created.
+ * If no bbt exists at all then the device is scanned for factory marked
+ * good / bad blocks and the bad block tables are created.
  *
- * For manufacturer created bbts like the one found on M-SYS DOC devices 
+ * For manufacturer created bbts like the one found on M-SYS DOC devices
  * the bbt is searched and read but never created
  *
- * The autogenerated bad block table is located in the last good blocks 
- * of the device. The table is mirrored, so it can be updated eventually. 
- * The table is marked in the oob area with an ident pattern and a version 
+ * The autogenerated bad block table is located in the last good blocks
+ * of the device. The table is mirrored, so it can be updated eventually.
+ * The table is marked in the oob area with an ident pattern and a version
  * number which indicates which of both tables is more up to date.
  *
  * The table uses 2 bits per block
@@ -43,13 +43,13 @@
  * 01b:		block is marked bad due to wear
  * 10b:		block is reserved (to protect the bbt area)
  * 11b:		block is factory marked bad
- * 
+ *
  * Multichip devices like DOC store the bad block info per floor.
  *
  * Following assumptions are made:
  * - bbts start at a page boundary, if autolocated on a block boundary
  * - the space neccecary for a bbt in FLASH does not exceed a block boundary
- * 
+ *
  */
 
 #include <common.h>
@@ -63,7 +63,7 @@
 
 #include <asm/errno.h>
 
-/** 
+/**
  * check_pattern - [GENERIC] check if a pattern is in the buffer
  * @buf:	the buffer to search
  * @len:	the length of buffer to search
@@ -87,9 +87,9 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
 			if (p[i] != 0xff)
 				return -1;
 		}
-	}	
+	}
 	p += end;
-	
+
 	/* Compare the pattern */
 	for (i = 0; i < td->len; i++) {
 		if (p[i] != td->pattern[i])
@@ -120,7 +120,7 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
  * Read the bad block table starting from page.
  *
  */
-static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num, 
+static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
 	int bits, int offs, int reserved_block_code)
 {
 	int res, i, j, act = 0;
@@ -131,7 +131,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
 
 	totlen = (num * bits) >> 3;
 	from = ((loff_t)page) << this->page_shift;
-	
+
 	while (totlen) {
 		len = min (totlen, (size_t) (1 << this->bbt_erase_shift));
 		res = mtd->read_ecc (mtd, from, len, &retlen, buf, NULL, this->autooob);
@@ -141,7 +141,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
 				return res;
 			}
 			printk (KERN_WARNING "nand_bbt: ECC error while reading bad block table\n");
-		}	
+		}
 
 		/* Analyse data */
 		for (i = 0; i < len; i++) {
@@ -161,12 +161,12 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
 				 * message to MTD_DEBUG_LEVEL0 */
 				printk (KERN_DEBUG "nand_read_bbt: Bad block at 0x%08x\n",
 					((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
-				/* Factory marked bad or worn out ? */	
+				/* Factory marked bad or worn out ? */
 				if (tmp == 0)
 					this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
 				else
 					this->bbt[offs + (act >> 3)] |= 0x1 << (act & 0x06);
-			}	
+			}
 		}
 		totlen -= len;
 		from += len;
@@ -178,7 +178,7 @@ static int read_bbt (struct mtd_info *mtd, uint8_t *buf, int page, int num,
  * read_abs_bbt - [GENERIC] Read the bad block table starting at a given page
  * @mtd:	MTD device structure
  * @buf:	temporary buffer
- * @td:		descriptor for the bad block table 
+ * @td:		descriptor for the bad block table
  * @chip:	read the table for a specific chip, -1 read all chips.
  *		Applies only if NAND_BBT_PERCHIP option is set
  *
@@ -213,7 +213,7 @@ static int read_abs_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
  * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
  * @mtd:	MTD device structure
  * @buf:	temporary buffer
- * @td:		descriptor for the bad block table 
+ * @td:		descriptor for the bad block table
  * @md:		descriptor for the bad block table mirror
  *
  * Read the bad block table(s) for all chips starting at a given page
@@ -225,16 +225,16 @@ static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_de
 {
 	struct nand_chip *this = mtd->priv;
 
-	/* Read the primary version, if available */	
+	/* Read the primary version, if available */
 	if (td->options & NAND_BBT_VERSION) {
-		nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); 
+		nand_read_raw (mtd, buf, td->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
 		td->version[0] = buf[mtd->oobblock + td->veroffs];
 		printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", td->pages[0], td->version[0]);
 	}
 
-	/* Read the mirror version, if available */	
+	/* Read the mirror version, if available */
 	if (md && (md->options & NAND_BBT_VERSION)) {
-		nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize); 
+		nand_read_raw (mtd, buf, md->pages[0] << this->page_shift, mtd->oobblock, mtd->oobsize);
 		md->version[0] = buf[mtd->oobblock + md->veroffs];
 		printk (KERN_DEBUG "Bad block table at page %d, version 0x%02X\n", md->pages[0], md->version[0]);
 	}
@@ -268,7 +268,7 @@ static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
 	else {
 		if (bd->options & NAND_BBT_SCAN2NDPAGE)
 			len = 2;
-		else	
+		else
 			len = 1;
 	}
 	scanlen	= mtd->oobblock + mtd->oobsize;
@@ -285,20 +285,20 @@ static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
 		if (chip >= this->numchips) {
 			printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n",
 				chip + 1, this->numchips);
-			return;	
+			return;
 		}
 		numblocks = this->chipsize >> (this->bbt_erase_shift - 1);
 		startblock = chip * numblocks;
 		numblocks += startblock;
 		from = startblock << (this->bbt_erase_shift - 1);
 	}
-	
+
 	for (i = startblock; i < numblocks;) {
 		nand_read_raw (mtd, buf, from, readlen, ooblen);
 		for (j = 0; j < len; j++) {
 			if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
 				this->bbt[i >> 3] |= 0x03 << (i & 0x6);
-				printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", 
+				printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
 					i >> 1, (unsigned int) from);
 				break;
 			}
@@ -315,15 +315,15 @@ static void create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
  * @td:		descriptor for the bad block table
  *
  * Read the bad block table by searching for a given ident pattern.
- * Search is preformed either from the beginning up or from the end of 
+ * Search is preformed either from the beginning up or from the end of
  * the device downwards. The search starts always at the start of a
  * block.
- * If the option NAND_BBT_PERCHIP is given, each chip is searched 
+ * If the option NAND_BBT_PERCHIP is given, each chip is searched
  * for a bbt, which contains the bad block information of this chip.
  * This is neccecary to provide support for certain DOC devices.
  *
- * The bbt ident pattern resides in the oob area of the first page 
- * in a block. 
+ * The bbt ident pattern resides in the oob area of the first page
+ * in a block.
  */
 static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td)
 {
@@ -338,10 +338,10 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
 		startblock = (mtd->size >> this->bbt_erase_shift) -1;
 		dir = -1;
 	} else {
-		startblock = 0;	
+		startblock = 0;
 		dir = 1;
-	}	
-	
+	}
+
 	/* Do we have a bbt per chip ? */
 	if (td->options & NAND_BBT_PERCHIP) {
 		chips = this->numchips;
@@ -351,19 +351,19 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
 		chips = 1;
 		bbtblocks = mtd->size >> this->bbt_erase_shift;
 	}
-	
+
 	/* Number of bits for each erase block in the bbt */
 	bits = td->options & NAND_BBT_NRBITS_MSK;
-	
+
 	for (i = 0; i < chips; i++) {
 		/* Reset version information */
-		td->version[i] = 0;	
+		td->version[i] = 0;
 		td->pages[i] = -1;
 		/* Scan the maximum number of blocks */
 		for (block = 0; block < td->maxblocks; block++) {
 			int actblock = startblock + dir * block;
 			/* Read first page */
-			nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize); 
+			nand_read_raw (mtd, buf, actblock << this->bbt_erase_shift, mtd->oobblock, mtd->oobsize);
 			if (!check_pattern(buf, scanlen, mtd->oobblock, td)) {
 				td->pages[i] = actblock << (this->bbt_erase_shift - this->page_shift);
 				if (td->options & NAND_BBT_VERSION) {
@@ -381,46 +381,46 @@ static int search_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
 		else
 			printk (KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i], td->version[i]);
 	}
-	return 0;	
+	return 0;
 }
 
 /**
  * search_read_bbts - [GENERIC] scan the device for bad block table(s)
  * @mtd:	MTD device structure
  * @buf:	temporary buffer
- * @td:		descriptor for the bad block table 
+ * @td:		descriptor for the bad block table
  * @md:		descriptor for the bad block table mirror
  *
  * Search and read the bad block table(s)
 */
-static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf, 
+static int search_read_bbts (struct mtd_info *mtd, uint8_t *buf,
 	struct nand_bbt_descr *td, struct nand_bbt_descr *md)
 {
 	/* Search the primary table */
 	search_bbt (mtd, buf, td);
-		
+
 	/* Search the mirror table */
 	if (md)
 		search_bbt (mtd, buf, md);
-	
+
 	/* Force result check */
-	return 1;	
+	return 1;
 }
-	
 
-/** 
+
+/**
  * write_bbt - [GENERIC] (Re)write the bad block table
  *
  * @mtd:	MTD device structure
  * @buf:	temporary buffer
- * @td:		descriptor for the bad block table 
+ * @td:		descriptor for the bad block table
  * @md:		descriptor for the bad block table mirror
  * @chipsel:	selector for a specific chip, -1 for all
  *
  * (Re)write the bad block table
  *
 */
-static int write_bbt (struct mtd_info *mtd, uint8_t *buf, 
+static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
 	struct nand_bbt_descr *td, struct nand_bbt_descr *md, int chipsel)
 {
 	struct nand_chip *this = mtd->priv;
@@ -439,7 +439,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
 	/* Write bad block table per chip rather than per device ? */
 	if (td->options & NAND_BBT_PERCHIP) {
 		numblocks = (int) (this->chipsize >> this->bbt_erase_shift);
-		/* Full device write or specific chip ? */	
+		/* Full device write or specific chip ? */
 		if (chipsel == -1) {
 			nrchips = this->numchips;
 		} else {
@@ -449,19 +449,19 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
 	} else {
 		numblocks = (int) (mtd->size >> this->bbt_erase_shift);
 		nrchips = 1;
-	}	
-	
+	}
+
 	/* Loop through the chips */
 	for (; chip < nrchips; chip++) {
-		
-		/* There was already a version of the table, reuse the page 
-		 * This applies for absolute placement too, as we have the 
+
+		/* There was already a version of the table, reuse the page
+		 * This applies for absolute placement too, as we have the
 		 * page nr. in td->pages.
 		 */
 		if (td->pages[chip] != -1) {
 			page = td->pages[chip];
 			goto write;
-		}	
+		}
 
 		/* Automatic placement of the bad block table */
 		/* Search direction top -> down ? */
@@ -471,7 +471,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
 		} else {
 			startblock = chip * numblocks;
 			dir = 1;
-		}	
+		}
 
 		for (i = 0; i < td->maxblocks; i++) {
 			int block = startblock + dir * i;
@@ -488,7 +488,7 @@ static int write_bbt (struct mtd_info *mtd, uint8_t *buf,
 		}
 		printk (KERN_ERR "No space left to write bad block table\n");
 		return -ENOSPC;
-write:	
+write:
 
 		/* Set up shift count and masks for the flash table */
 		bits = td->options & NAND_BBT_NRBITS_MSK;
@@ -499,14 +499,14 @@ write:
 		case 8: sft = 0; sftmsk = 0x00; msk[0] = 0x00; msk[1] = 0x0F; msk[2] = ~rcode; msk[3] = 0xff; break;
 		default: return -EINVAL;
 		}
-		
+
 		bbtoffs = chip * (numblocks >> 2);
-		
+
 		to = ((loff_t) page) << this->page_shift;
 
 		memcpy (&oobinfo, this->autooob, sizeof(oobinfo));
 		oobinfo.useecc = MTD_NANDECC_PLACEONLY;
-		
+
 		/* Must we save the block contents ? */
 		if (td->options & NAND_BBT_SAVECONTENT) {
 			/* Make it block aligned */
@@ -545,7 +545,7 @@ write:
 				buf[len + td->veroffs] = td->version[chip];
 			}
 		}
-	
+
 		/* walk through the memory table */
 		for (i = 0; i < numblocks; ) {
 			uint8_t dat;
@@ -557,7 +557,7 @@ write:
 				dat >>= 2;
 			}
 		}
-		
+
 		memset (&einfo, 0, sizeof (einfo));
 		einfo.mtd = mtd;
 		einfo.addr = (unsigned long) to;
@@ -567,18 +567,18 @@ write:
 			printk (KERN_WARNING "nand_bbt: Error during block erase: %d\n", res);
 			return res;
 		}
-	
+
 		res = mtd->write_ecc (mtd, to, len, &retlen, buf, &buf[len], &oobinfo);
 		if (res < 0) {
 			printk (KERN_WARNING "nand_bbt: Error while writing bad block table %d\n", res);
 			return res;
 		}
-		printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n", 
+		printk (KERN_DEBUG "Bad block table written to 0x%08x, version 0x%02X\n",
 			(unsigned int) to, td->version[chip]);
-	
+
 		/* Mark it as used */
 		td->pages[chip] = page;
-	}	
+	}
 	return 0;
 }
 
@@ -587,7 +587,7 @@ write:
  * @mtd:	MTD device structure
  * @bd:		descriptor for the good/bad block search pattern
  *
- * The function creates a memory based bbt by scanning the device 
+ * The function creates a memory based bbt by scanning the device
  * for manufacturer / software marked good / bad blocks
 */
 static int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
@@ -621,11 +621,11 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
 	struct nand_bbt_descr *rd, *rd2;
 
 	/* Do we have a bbt per chip ? */
-	if (td->options & NAND_BBT_PERCHIP) 
+	if (td->options & NAND_BBT_PERCHIP)
 		chips = this->numchips;
-	else 
+	else
 		chips = 1;
-	
+
 	for (i = 0; i < chips; i++) {
 		writeops = 0;
 		rd = NULL;
@@ -640,7 +640,7 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
 			}
 
 			if (td->pages[i] == -1) {
-				rd = md;				
+				rd = md;
 				td->version[i] = md->version[i];
 				writeops = 1;
 				goto writecheck;
@@ -658,7 +658,7 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
 				if (!(td->options & NAND_BBT_VERSION))
 					rd2 = md;
 				goto writecheck;
-			}	
+			}
 
 			if (((int8_t) (td->version[i] - md->version[i])) > 0) {
 				rd = td;
@@ -683,15 +683,15 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
 create:
 		/* Create the bad block table by scanning the device ? */
 		if (!(td->options & NAND_BBT_CREATE))
-			continue;	
-		
+			continue;
+
 		/* Create the table in memory by scanning the chip(s) */
 		create_bbt (mtd, buf, bd, chipsel);
-		
+
 		td->version[i] = 1;
 		if (md)
-			md->version[i] = 1;	
-writecheck:	
+			md->version[i] = 1;
+writecheck:
 		/* read back first ? */
 		if (rd)
 			read_abs_bbt (mtd, buf, rd, chipsel);
@@ -705,7 +705,7 @@ writecheck:
 			if (res < 0)
 				return res;
 		}
-		
+
 		/* Write the mirror bad block table to the device ? */
 		if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) {
 			res = write_bbt (mtd, buf, md, td, chipsel);
@@ -713,11 +713,11 @@ writecheck:
 				return res;
 		}
 	}
-	return 0;	
+	return 0;
 }
 
 /**
- * mark_bbt_regions - [GENERIC] mark the bad block table regions 
+ * mark_bbt_regions - [GENERIC] mark the bad block table regions
  * @mtd:	MTD device structure
  * @td:		bad block table descriptor
  *
@@ -738,14 +738,14 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
 	} else {
 		chips = 1;
 		nrblocks = (int)(mtd->size >> this->bbt_erase_shift);
-	}	
-	
+	}
+
 	for (i = 0; i < chips; i++) {
 		if ((td->options & NAND_BBT_ABSPAGE) ||
 		    !(td->options & NAND_BBT_WRITE)) {
 		    	if (td->pages[i] == -1) continue;
 			block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift);
-			block <<= 1;		
+			block <<= 1;
 			oldval = this->bbt[(block >> 3)];
 			newval = oldval | (0x2 << (block & 0x06));
 			this->bbt[(block >> 3)] = newval;
@@ -756,16 +756,16 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
 		update = 0;
 		if (td->options & NAND_BBT_LASTBLOCK)
 			block = ((i + 1) * nrblocks) - td->maxblocks;
-		else	
+		else
 			block = i * nrblocks;
-		block <<= 1;	
+		block <<= 1;
 		for (j = 0; j < td->maxblocks; j++) {
 			oldval = this->bbt[(block >> 3)];
 			newval = oldval | (0x2 << (block & 0x06));
 			this->bbt[(block >> 3)] = newval;
 			if (oldval != newval) update = 1;
 			block += 2;
-		}	
+		}
 		/* If we want reserved blocks to be recorded to flash, and some
 		   new ones have been marked, then we need to update the stored
 		   bbts.  This should only happen once. */
@@ -779,7 +779,7 @@ static void mark_bbt_region (struct mtd_info *mtd, struct nand_bbt_descr *td)
  * @mtd:	MTD device structure
  * @bd:		descriptor for the good/bad block search pattern
  *
- * The function checks, if a bad block table(s) is/are already 
+ * The function checks, if a bad block table(s) is/are already
  * available. If not it scans the device for manufacturer
  * marked good / bad blocks and writes the bad block table(s) to
  * the selected place.
@@ -822,30 +822,30 @@ int nand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
 		this->bbt = NULL;
 		return -ENOMEM;
 	}
-	
+
 	/* Is the bbt at a given page ? */
 	if (td->options & NAND_BBT_ABSPAGE) {
 		res = read_abs_bbts (mtd, buf, td, md);
-	} else {	
+	} else {
 		/* Search the bad block table using a pattern in oob */
 		res = search_read_bbts (mtd, buf, td, md);
-	}	
+	}
 
-	if (res) 
+	if (res)
 		res = check_create (mtd, buf, bd);
-	
+
 	/* Prevent the bbt regions from erasing / writing */
 	mark_bbt_region (mtd, td);
 	if (md)
 		mark_bbt_region (mtd, md);
-	
+
 	kfree (buf);
 	return res;
 }
 
 
 /**
- * nand_update_bbt - [NAND Interface] update bad block table(s) 
+ * nand_update_bbt - [NAND Interface] update bad block table(s)
  * @mtd:	MTD device structure
  * @offs:	the offset of the newly marked block
  *
@@ -872,7 +872,7 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
 		printk (KERN_ERR "nand_update_bbt: Out of memory\n");
 		return -ENOMEM;
 	}
-	
+
 	writeops = md != NULL ? 0x03 : 0x01;
 
 	/* Do we have a bbt per chip ? */
@@ -886,7 +886,7 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
 
 	td->version[chip]++;
 	if (md)
-		md->version[chip]++;	
+		md->version[chip]++;
 
 	/* Write the bad block table to the device ? */
 	if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
@@ -899,15 +899,15 @@ int nand_update_bbt (struct mtd_info *mtd, loff_t offs)
 		res = write_bbt (mtd, buf, md, td, chipsel);
 	}
 
-out:	
+out:
 	kfree (buf);
 	return res;
 }
 
-/* Define some generic bad / good block scan pattern which are used 
+/* Define some generic bad / good block scan pattern which are used
  * while scanning a device for factory marked good / bad blocks
- * 
- * The memory based patterns just 
+ *
+ * The memory based patterns just
  */
 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
 
@@ -954,7 +954,7 @@ static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
 static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
 
 static struct nand_bbt_descr bbt_main_descr = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
 	.offs =	8,
 	.len = 4,
@@ -964,7 +964,7 @@ static struct nand_bbt_descr bbt_main_descr = {
 };
 
 static struct nand_bbt_descr bbt_mirror_descr = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE 
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
 	.offs =	8,
 	.len = 4,
@@ -974,7 +974,7 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 };
 
 /**
- * nand_default_bbt - [NAND Interface] Select a default bad block table for the device 
+ * nand_default_bbt - [NAND Interface] Select a default bad block table for the device
  * @mtd:	MTD device structure
  *
  * This function selects the default bad block table
@@ -984,29 +984,29 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 int nand_default_bbt (struct mtd_info *mtd)
 {
 	struct nand_chip *this = mtd->priv;
-	
-	/* Default for AG-AND. We must use a flash based 
+
+	/* Default for AG-AND. We must use a flash based
 	 * bad block table as the devices have factory marked
 	 * _good_ blocks. Erasing those blocks leads to loss
 	 * of the good / bad information, so we _must_ store
-	 * this information in a good / bad table during 
+	 * this information in a good / bad table during
 	 * startup
 	*/
 	if (this->options & NAND_IS_AND) {
 		/* Use the default pattern descriptors */
-		if (!this->bbt_td) {	
+		if (!this->bbt_td) {
 			this->bbt_td = &bbt_main_descr;
 			this->bbt_md = &bbt_mirror_descr;
-		}	
+		}
 		this->options |= NAND_USE_FLASH_BBT;
 		return nand_scan_bbt (mtd, &agand_flashbased);
 	}
-	
-	
+
+
 	/* Is a flash based bad block table requested ? */
 	if (this->options & NAND_USE_FLASH_BBT) {
-		/* Use the default pattern descriptors */	
-		if (!this->bbt_td) {	
+		/* Use the default pattern descriptors */
+		if (!this->bbt_td) {
 			this->bbt_td = &bbt_main_descr;
 			this->bbt_md = &bbt_mirror_descr;
 		}
@@ -1026,23 +1026,23 @@ int nand_default_bbt (struct mtd_info *mtd)
 }
 
 /**
- * nand_isbad_bbt - [NAND Interface] Check if a block is bad 
+ * nand_isbad_bbt - [NAND Interface] Check if a block is bad
  * @mtd:	MTD device structure
  * @offs:	offset in the device
  * @allowbbt:	allow access to bad block table region
  *
-*/
+ */
 int nand_isbad_bbt (struct mtd_info *mtd, loff_t offs, int allowbbt)
 {
 	struct nand_chip *this = mtd->priv;
 	int block;
 	uint8_t	res;
-	
+
 	/* Get block number * 2 */
 	block = (int) (offs >> (this->bbt_erase_shift - 1));
 	res = (this->bbt[block >> 3] >> (block & 0x06)) & 0x03;
 
-	DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n", 
+	DEBUG (MTD_DEBUG_LEVEL2, "nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
 		(unsigned int)offs, res, block >> 1);
 
 	switch ((int)res) {