[PATCH] Various fixes for NAND.

[PATCH] Various fixes for NAND.

[Pantelis Antoniou]

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Hello

The following patch does two things.

1. Adds an erase_shift member to the nand_chip structure
   so that we can avoid multiplications and divisions.

2. Makes the autoob the default oobinfo so that when no access
   from user space is made to fill it, it doesn't default to no ECC.

Regards

Pantelis

[-- Attachment #2: various.diff --]
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diff -ruN mtd-original/drivers/mtd/mtdpart.c mtd-work/drivers/mtd/mtdpart.c
--- mtd-original/drivers/mtd/mtdpart.c	2004-03-30 01:00:17.000000000 +0300
+++ mtd-work/drivers/mtd/mtdpart.c	2004-05-06 10:00:40.449248560 +0300
@@ -485,6 +485,9 @@
 				parts[i].name);
 		}
 
+		/* copy oobinfo from master */ 
+		memcpy(&slave->mtd.oobinfo, &master->oobinfo, sizeof(slave->mtd.oobinfo));
+
 		if(parts[i].mtdp)
 		{	/* store the object pointer (caller may or may not register it */
 			*parts[i].mtdp = &slave->mtd;
diff -ruN mtd-original/drivers/mtd/nand/nand.c mtd-work/drivers/mtd/nand/nand.c
--- mtd-original/drivers/mtd/nand/nand.c	2004-05-05 01:00:35.000000000 +0300
+++ mtd-work/drivers/mtd/nand/nand.c	2004-05-06 10:01:55.231879872 +0300
@@ -1163,7 +1163,7 @@
 	/* Check, if the buffer must be filled with ff again */
 	if (this->oobdirty) {	
 		memset (this->oob_buf, 0xff, 
-			mtd->oobsize * (mtd->erasesize / mtd->oobblock));
+			mtd->oobsize << (this->erase_shift - this->page_shift));
 		this->oobdirty = 0;
 	}	
 	
@@ -1671,7 +1671,7 @@
 	chipnr = (int)((unsigned long)instr->addr / this->chipsize);
 
 	/* Calculate pages in each block */
-	pages_per_block = mtd->erasesize / mtd->oobblock;
+	pages_per_block = 1 << (this->erase_shift - this->page_shift);
 
 	/* Select the NAND device */
 	this->select_chip(mtd, chipnr);
@@ -1941,6 +1941,7 @@
 		
 		/* Calculate the address shift from the page size */	
 		this->page_shift = ffs(mtd->oobblock) - 1;
+		this->erase_shift = ffs(mtd->erasesize) - 1;
 
 		/* Set the bad block position */
 		this->badblockpos = mtd->oobblock > 512 ? 
@@ -1994,7 +1995,7 @@
 	/* Convert chipsize to number of pages per chip -1. */
 	this->pagemask = (this->chipsize >> this->page_shift) - 1;
 	/* Preset the internal oob buffer */
-	memset(this->oob_buf, 0xff, mtd->oobsize * (mtd->erasesize / mtd->oobblock));	
+	memset(this->oob_buf, 0xff, mtd->oobsize << (this->erase_shift - this->page_shift));
 
 	/* If no default placement scheme is given, select an
 	 * appropriate one */
@@ -2120,6 +2121,10 @@
 	mtd->resume = NULL;
 	mtd->block_isbad = nand_block_isbad;
 	mtd->block_markbad = nand_block_markbad;
+
+	/* and make the autooob the default one */
+	memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
+
 	mtd->owner = THIS_MODULE;
 
 	/* Return happy */
diff -ruN mtd-original/include/linux/mtd/nand.h mtd-work/include/linux/mtd/nand.h
--- mtd-original/include/linux/mtd/nand.h	2004-04-17 01:00:05.000000000 +0300
+++ mtd-work/include/linux/mtd/nand.h	2004-05-06 09:59:30.404896920 +0300
@@ -235,6 +235,7 @@
 	wait_queue_head_t wq;
 	nand_state_t 	state;
 	int 		page_shift;
+	int		erase_shift;
 	u_char 		*data_buf;
 	u_char		*oob_buf;
 	int		oobdirty;

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 drivers/mtd/mtdpart.c    |    3 +++
 drivers/mtd/nand/nand.c  |   11 ++++++++---
 include/linux/mtd/nand.h |    1 +
 3 files changed, 12 insertions(+), 3 deletions(-)