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ff8a8a7183
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] This patch synchronizes the nand driver with the Linux 3.0 state. Signed-off-by: Christian Hitz <christian.hitz@aizo.com> Cc: Scott Wood <scottwood@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
154 lines
5.5 KiB
C
154 lines
5.5 KiB
C
/*
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* linux/include/linux/mtd/bbm.h
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*
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* NAND family Bad Block Management (BBM) header file
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* - Bad Block Table (BBT) implementation
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*
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* Copyright (c) 2005-2007 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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*
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* Copyright (c) 2000-2005
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* Thomas Gleixner <tglx@linuxtronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __LINUX_MTD_BBM_H
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#define __LINUX_MTD_BBM_H
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/* The maximum number of NAND chips in an array */
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#ifndef CONFIG_SYS_NAND_MAX_CHIPS
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#define CONFIG_SYS_NAND_MAX_CHIPS 1
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#endif
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/**
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* struct nand_bbt_descr - bad block table descriptor
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* @param options options for this descriptor
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* @param pages the page(s) where we find the bbt, used with
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* option BBT_ABSPAGE when bbt is searched,
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* then we store the found bbts pages here.
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* Its an array and supports up to 8 chips now
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* @param offs offset of the pattern in the oob area of the page
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* @param veroffs offset of the bbt version counter in the oob are of the page
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* @param version version read from the bbt page during scan
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* @param len length of the pattern, if 0 no pattern check is performed
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* @param maxblocks maximum number of blocks to search for a bbt. This number of
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* blocks is reserved at the end of the device
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* where the tables are written.
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* @param reserved_block_code if non-0, this pattern denotes a reserved
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* (rather than bad) block in the stored bbt
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* @param pattern pattern to identify bad block table or factory marked
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* good / bad blocks, can be NULL, if len = 0
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*
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* Descriptor for the bad block table marker and the descriptor for the
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* pattern which identifies good and bad blocks. The assumption is made
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* that the pattern and the version count are always located in the oob area
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* of the first block.
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*/
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struct nand_bbt_descr {
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int options;
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int pages[CONFIG_SYS_NAND_MAX_CHIPS];
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int offs;
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int veroffs;
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uint8_t version[CONFIG_SYS_NAND_MAX_CHIPS];
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int len;
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int maxblocks;
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int reserved_block_code;
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uint8_t *pattern;
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};
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/* Options for the bad block table descriptors */
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/* The number of bits used per block in the bbt on the device */
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#define NAND_BBT_NRBITS_MSK 0x0000000F
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#define NAND_BBT_1BIT 0x00000001
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#define NAND_BBT_2BIT 0x00000002
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#define NAND_BBT_4BIT 0x00000004
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#define NAND_BBT_8BIT 0x00000008
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/* The bad block table is in the last good block of the device */
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#define NAND_BBT_LASTBLOCK 0x00000010
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/* The bbt is at the given page, else we must scan for the bbt */
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#define NAND_BBT_ABSPAGE 0x00000020
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/* The bbt is at the given page, else we must scan for the bbt */
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#define NAND_BBT_SEARCH 0x00000040
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/* bbt is stored per chip on multichip devices */
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#define NAND_BBT_PERCHIP 0x00000080
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/* bbt has a version counter at offset veroffs */
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#define NAND_BBT_VERSION 0x00000100
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/* Create a bbt if none exists */
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#define NAND_BBT_CREATE 0x00000200
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/* Search good / bad pattern through all pages of a block */
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#define NAND_BBT_SCANALLPAGES 0x00000400
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/* Scan block empty during good / bad block scan */
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#define NAND_BBT_SCANEMPTY 0x00000800
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/* Write bbt if neccecary */
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#define NAND_BBT_WRITE 0x00001000
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/* Read and write back block contents when writing bbt */
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#define NAND_BBT_SAVECONTENT 0x00002000
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/* Search good / bad pattern on the first and the second page */
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#define NAND_BBT_SCAN2NDPAGE 0x00004000
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/* Search good / bad pattern on the last page of the eraseblock */
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#define NAND_BBT_SCANLASTPAGE 0x00008000
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/* Chip stores bad block marker on BOTH 1st and 6th bytes of OOB */
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#define NAND_BBT_SCANBYTE1AND6 0x00100000
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/* The nand_bbt_descr was created dynamicaly and must be freed */
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#define NAND_BBT_DYNAMICSTRUCT 0x00200000
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/* The bad block table does not OOB for marker */
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#define NAND_BBT_NO_OOB 0x00400000
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/* The maximum number of blocks to scan for a bbt */
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#define NAND_BBT_SCAN_MAXBLOCKS 4
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/*
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* Constants for oob configuration
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*/
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#define ONENAND_BADBLOCK_POS 0
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/*
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* Bad block scanning errors
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*/
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#define ONENAND_BBT_READ_ERROR 1
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#define ONENAND_BBT_READ_ECC_ERROR 2
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#define ONENAND_BBT_READ_FATAL_ERROR 4
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/**
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* struct bbt_info - [GENERIC] Bad Block Table data structure
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* @param bbt_erase_shift [INTERN] number of address bits in a bbt entry
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* @param badblockpos [INTERN] position of the bad block marker in the oob area
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* @param bbt [INTERN] bad block table pointer
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* @param badblock_pattern [REPLACEABLE] bad block scan pattern used for initial bad block scan
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* @param priv [OPTIONAL] pointer to private bbm date
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*/
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struct bbm_info {
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int bbt_erase_shift;
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int badblockpos;
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int options;
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uint8_t *bbt;
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int (*isbad_bbt) (struct mtd_info * mtd, loff_t ofs, int allowbbt);
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/* TODO Add more NAND specific fileds */
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struct nand_bbt_descr *badblock_pattern;
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void *priv;
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};
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/* OneNAND BBT interface */
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extern int onenand_scan_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd);
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extern int onenand_default_bbt (struct mtd_info *mtd);
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#endif /* __LINUX_MTD_BBM_H */
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