http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/mtd/bbm.h

/* * linux/include/linux/mtd/bbm.h * * NAND family Bad Block Management (BBM) header file * - Bad Block Table (BBT) implementation * * Copyright (c) 2005 Samsung Electronics * Kyungmin Park <kyungmin.park@samsung.com> * * Copyright (c) 2000-2005 * Thomas Gleixner <tglx@linuxtronix.de> * */ #ifndef __LINUX_MTD_BBM_H #define __LINUX_MTD_BBM_H /* The maximum number of NAND chips in an array */ #define NAND_MAX_CHIPS 8 /** * 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 */