/* *  linux/include/linux/mtd/bbm.h * *  NAND family Bad Block Management (BBM) header file *    - Bad Block Table (BBT) implementation * *  Copyright (c) 2005-2007 Samsung Electronics *  Kyungmin Park <kyungmin.park@samsung.com> * *  Copyright (c) 2000-2005 *  Thomas Gleixner <tglx@linuxtronix.de> * * 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. */#ifndef __LINUX_MTD_BBM_H#define __LINUX_MTD_BBM_H/* The maximum number of NAND chips in an array */#ifndef NAND_MAX_CHIPS#define NAND_MAX_CHIPS		8#endif/** * struct nand_bbt_descr - bad block table descriptor * @param options	options for this descriptor * @param pages		the page(s) where we find the bbt, used with * 			option BBT_ABSPAGE when bbt is searched, * 			then we store the found bbts pages here. *			Its an array and supports up to 8 chips now * @param offs		offset of the pattern in the oob area of the page * @param veroffs	offset of the bbt version counter in the oob are of the page * @param version	version read from the bbt page during scan * @param len		length of the pattern, if 0 no pattern check is performed * @param maxblocks	maximum number of blocks to search for a bbt. This number of *			blocks is reserved at the end of the device *			where the tables are written. * @param reserved_block_code	if non-0, this pattern denotes a reserved *			(rather than bad) block in the stored bbt * @param pattern	pattern to identify bad block table or factory marked *			good / bad blocks, can be NULL, if len = 0 * * Descriptor for the bad block table marker and the descriptor for the * pattern which identifies good and bad blocks. The assumption is made * that the pattern and the version count are always located in the oob area * of the first block. */struct nand_bbt_descr {	int options;	int pages[NAND_MAX_CHIPS];	int offs;	int veroffs;	uint8_t version[NAND_MAX_CHIPS];	int len;	int maxblocks;	int reserved_block_code;	uint8_t *pattern;};/* Options for the bad block table descriptors *//* The number of bits used per block in the bbt on the device */#define NAND_BBT_NRBITS_MSK	0x0000000F#define NAND_BBT_1BIT		0x00000001#define NAND_BBT_2BIT		0x00000002#define NAND_BBT_4BIT		0x00000004#define NAND_BBT_8BIT		0x00000008/* The bad block table is in the last good block of the device */#define NAND_BBT_LASTBLOCK	0x00000010/* The bbt is at the given page, else we must scan for the bbt */#define NAND_BBT_ABSPAGE	0x00000020/* The bbt is at the given page, else we must scan for the bbt */#define NAND_BBT_SEARCH		0x00000040/* bbt is stored per chip on multichip devices */#define NAND_BBT_PERCHIP	0x00000080/* bbt has a version counter at offset veroffs */#define NAND_BBT_VERSION	0x00000100/* Create a bbt if none axists */#define NAND_BBT_CREATE		0x00000200/* Search good / bad pattern through all pages of a block */#define NAND_BBT_SCANALLPAGES	0x00000400/* Scan block empty during good / bad block scan */#define NAND_BBT_SCANEMPTY	0x00000800/* Write bbt if neccecary */#define NAND_BBT_WRITE		0x00001000/* Read and write back block contents when writing bbt */#define NAND_BBT_SAVECONTENT	0x00002000/* Search good / bad pattern on the first and the second page */#define NAND_BBT_SCAN2NDPAGE	0x00004000/* The maximum number of blocks to scan for a bbt */#define NAND_BBT_SCAN_MAXBLOCKS	4/* * Constants for oob configuration */#define ONENAND_BADBLOCK_POS	0/** * struct bbt_info - [GENERIC] Bad Block Table data structure * @param bbt_erase_shift	[INTERN] number of address bits in a bbt entry * @param badblockpos		[INTERN] position of the bad block marker in the oob area * @param bbt			[INTERN] bad block table pointer * @param badblock_pattern	[REPLACEABLE] bad block scan pattern used for initial bad block scan * @param priv			[OPTIONAL] pointer to private bbm date */struct bbm_info {	int bbt_erase_shift;	int badblockpos;	int options;	uint8_t *bbt;	int (*isbad_bbt) (struct mtd_info * mtd, loff_t ofs, int allowbbt);	/* TODO Add more NAND specific fileds */	struct nand_bbt_descr *badblock_pattern;	void *priv;};/* OneNAND BBT interface */extern int onenand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd);extern int onenand_default_bbt (struct mtd_info *mtd);#endif				/* __LINUX_MTD_BBM_H */