11  * depending on the options in the BBT descriptor(s). If no flash based BBT
13  * marked good / bad blocks. This information is used to create a memory BBT.
16  * If a flash based BBT is specified then the function first tries to find the
17  * BBT on flash. If a BBT is found then the contents are read and the memory
18  * based BBT is created. If a mirrored BBT is selected then the mirror is
20  * version number, then the mirror BBT is used to build the memory based BBT.
23  * If no BBT exists at all then the device is scanned for factory marked
27  * the BBT is searched and read but never created
46  * 10b:		block is reserved (to protect the bbt area)
53  * - the space necessary for a bbt in FLASH does not exceed a block boundary
78 	uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT];  in bbt_get_entry()
87 	chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk;  in bbt_mark_entry()
138  * @td: BBT descriptor used for computation
160  * @num: the number of bbt descriptors to read
161  * @td: the bbt describtion table
186 			 * In case the BBT marker is not in the OOB area it  in read_bbt()
196 				pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n",  in read_bbt()
200 				pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n",  in read_bbt()
204 				pr_info("nand_bbt: error reading BBT\n");  in read_bbt()
257  * that the bbt bits are in consecutive order.
286 /* BBT marker is in the first page, no OOB */
387  * assume that the bbt bits are in consecutive order.
450 /* Check if a potential BBT block is marked as bad */
457 	 * No need to check for a bad BBT block if the BBM area overlaps with  in bbt_block_checkbad()
546  * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains
550  * The bbt ident pattern resides in the oob area of the first page in a block.
572 	/* Do we have a bbt per chip? */  in search_bbt()
609 	/* Check, if we found a bbt for each requested chip */  in search_bbt()
642  * get_bbt_block - Get the first valid eraseblock suitable to store a BBT
644  * @td: the BBT description
645  * @md: the mirror BBT descriptor
649  * suitable to store a BBT (i.e. in the range reserved for BBT), or -ENOSPC if
706  * mark_bbt_block_bad - Mark one of the block reserved for BBT bad
708  * @td: the BBT description
710  * @block: the BBT block to mark
712  * Blocks reserved for BBT can become bad. This functions is an helper to mark
713  * such blocks as bad. It takes care of updating the in-memory BBT, marking the
844 			/* Preset the bbt area with 0xff */  in write_bbt()
885 			/* Do not store the reserved bbt blocks! */  in write_bbt()
894 			pr_warn("nand_bbt: error while erasing BBT block %d\n",  in write_bbt()
904 			pr_warn("nand_bbt: error while writing BBT block %d\n",  in write_bbt()
928  * The function creates a memory based bbt by scanning the device for
940  * check_create - [GENERIC] create and write bbt(s) if necessary
946  * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found
958 	/* Do we have a bbt per chip? */  in check_create()
1083 	if (!this->bbt || !td)  in nand_update_bbt()
1093 	/* Do we have a bbt per chip? */  in nand_update_bbt()
1137 	/* Do we have a bbt per chip? */  in mark_bbt_region()
1257 	this->bbt = kzalloc(len, GFP_KERNEL);  in nand_scan_bbt()
1258 	if (!this->bbt)  in nand_scan_bbt()
1267 			pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n");  in nand_scan_bbt()
1284 	/* Is the bbt at a given page? */  in nand_scan_bbt()
1296 	/* Prevent the bbt regions from erasing / writing */  in nand_scan_bbt()
1307 	kfree(this->bbt);  in nand_scan_bbt()
1308 	this->bbt = NULL;  in nand_scan_bbt()
1318 /* Generic flash bbt descriptors */
1364  * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure
1455 	pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",  in nand_isbad_bbt()
1473  * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT