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Commit 1a78ff6b authored by Dan Brown's avatar Dan Brown Committed by Thomas Gleixner
Browse files

[MTD] DiskOnChip: Scan the entire device for Media Headers. 



Add a new module param, show_firmware_partition.

Signed-off-by: default avatarDan Brown <dan_brown@ieee.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 15fc1086

drivers/mtd/nand/diskonchip.c

+28 −22
Original line number Diff line number Diff line
@@ -16,7 +16,7 @@ 
 *  

 * Interface to generic NAND code for M-Systems DiskOnChip devices

 *

 * $Id: diskonchip.c,v 1.49 2005/02/22 21:48:21 gleixner Exp $

 * $Id: diskonchip.c,v 1.50 2005/03/29 20:57:45 dbrown Exp $

 */



#include <linux/kernel.h>
@@ -81,11 +81,6 @@ struct doc_priv { 
	struct mtd_info *nextdoc;

};



/* Max number of eraseblocks to scan (from start of device) for the (I)NFTL

   MediaHeader.  The spec says to just keep going, I think, but that's just

   silly. */

#define MAX_MEDIAHEADER_SCAN 8



/* This is the syndrome computed by the HW ecc generator upon reading an empty

   page, one with all 0xff for data and stored ecc code. */

static u_char empty_read_syndrome[6] = { 0x26, 0xff, 0x6d, 0x47, 0x73, 0x7a };
@@ -114,6 +109,9 @@ module_param(no_ecc_failures, int, 0); 
#ifdef CONFIG_MTD_PARTITIONS

static int no_autopart=0;

module_param(no_autopart, int, 0);



static int show_firmware_partition=0;

module_param(show_firmware_partition, int, 0);

#endif



#ifdef MTD_NAND_DISKONCHIP_BBTWRITE
@@ -1071,12 +1069,11 @@ static int __init find_media_headers(struct mtd_info *mtd, u_char *buf, 
{

	struct nand_chip *this = mtd->priv;

	struct doc_priv *doc = this->priv;

	unsigned offs, end = (MAX_MEDIAHEADER_SCAN << this->phys_erase_shift);

	unsigned offs;

	int ret;

	size_t retlen;



	end = min(end, mtd->size); // paranoia

	for (offs = 0; offs < end; offs += mtd->erasesize) {

	for (offs = 0; offs < mtd->size; offs += mtd->erasesize) {

		ret = mtd->read(mtd, offs, mtd->oobblock, &retlen, buf);

		if (retlen != mtd->oobblock) continue;

		if (ret) {
@@ -1118,6 +1115,7 @@ static inline int __init nftl_partscan(struct mtd_info *mtd, 
	u_char *buf;

	struct NFTLMediaHeader *mh;

	const unsigned psize = 1 << this->page_shift;

	int numparts = 0;

	unsigned blocks, maxblocks;

	int offs, numheaders;
@@ -1183,19 +1181,28 @@ static inline int __init nftl_partscan(struct mtd_info *mtd, 
	offs <<= this->page_shift;

	offs += mtd->erasesize;



	parts[0].name = " DiskOnChip BDTL partition";

	parts[0].offset = offs;

	parts[0].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;

	if (show_firmware_partition == 1) {

		parts[0].name = " DiskOnChip Firmware / Media Header partition";

		parts[0].offset = 0;

		parts[0].size = offs;

		numparts = 1;

	}



	parts[numparts].name = " DiskOnChip BDTL partition";

	parts[numparts].offset = offs;

	parts[numparts].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;



	offs += parts[numparts].size;

	numparts++;



	offs += parts[0].size;

	if (offs < mtd->size) {

		parts[1].name = " DiskOnChip Remainder partition";

		parts[1].offset = offs;

		parts[1].size = mtd->size - offs;

		ret = 2;

		goto out;

		parts[numparts].name = " DiskOnChip Remainder partition";

		parts[numparts].offset = offs;

		parts[numparts].size = mtd->size - offs;

		numparts++;

	}

	ret = 1;



	ret = numparts;

out:

	kfree(buf);

	return ret;
@@ -1289,14 +1296,13 @@ static inline int __init inftl_partscan(struct mtd_info *mtd, 
			ip->lastUnit, ip->flags,

			ip->spareUnits);



#if 0

		if ((i == 0) && (ip->firstUnit > 0)) {

		if ((show_firmware_partition == 1) &&

		    (i == 0) && (ip->firstUnit > 0)) {

			parts[0].name = " DiskOnChip IPL / Media Header partition";

			parts[0].offset = 0;

			parts[0].size = mtd->erasesize * ip->firstUnit;

			numparts = 1;

		}

#endif



		if (ip->flags & INFTL_BINARY)

			parts[numparts].name = " DiskOnChip BDK partition";