| /******************************************************************************* |
| Marvell GPL License Option |
| |
| If you received this File from Marvell, you may opt to use, redistribute and/or |
| modify this File in accordance with the terms and conditions of the General |
| Public License Version 2, June 1991 (the "GPL License"), a copy of which is |
| available along with the File in the license.txt file or by writing to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 or |
| on the worldwide web at http://www.gnu.org/licenses/gpl.txt. |
| |
| THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY |
| DISCLAIMED. The GPL License provides additional details about this warranty |
| disclaimer. |
| *******************************************************************************/ |
| |
| #ifndef _NAND_LNC_H_ |
| #define _NAND_LNC_H_ |
| |
| /* defines */ |
| #define MV_NAND_ECC_4BIT 4 |
| #define MV_NAND_ECC_1BIT 1 |
| |
| static struct nand_ecclayout mv_nand_rs_oobinfo = { |
| .eccbytes = 40, |
| .eccpos = { |
| 24, 25, 26, 27, 28, 29, 30, 31, |
| 32, 33, 34, 35, 36, 37, 38, 39, |
| 40, 41, 42, 43, 44, 45, 46, 47, |
| 48, 49, 50, 51, 52, 53, 54, 55, |
| 56, 57, 58, 59, 60, 61, 62, 63 |
| }, |
| |
| .oobfree = {{6, 18}} |
| }; |
| |
| //typedef unsigned int dtype; |
| typedef u_short dtype; |
| |
| void generate_gf(void); /* Generate Galois Field */ |
| void gen_poly(void); /* Generate generator polynomial */ |
| |
| /* Reed-Solomon encoding |
| * data[] is the input block, parity symbols are placed in bb[] |
| * bb[] may lie past the end of the data, e.g., for (255,223): |
| * encode_rs(&data[0],&data[223]); |
| */ |
| static inline char encode_rs(dtype data[], dtype bb[]); |
| |
| |
| /* Reed-Solomon errors decoding |
| * The received block goes into data[] |
| * |
| * The decoder corrects the symbols in place, if possible and returns |
| * the number of corrected symbols. If the codeword is illegal or |
| * uncorrectible, the data array is unchanged and -1 is returned |
| */ |
| static inline int decode_rs(dtype data[]); |
| |
| /** |
| * nand_calculate_ecc - [NAND Interface] Calculate 3 byte ECC code for 256 byte block |
| * @mtd: MTD block structure |
| * @dat: raw data |
| * @ecc_code: buffer for ECC |
| */ |
| int mv_nand_calculate_ecc_rs(struct mtd_info *mtd, const u_char *data, u_char *ecc_code); |
| |
| /** |
| * nand_correct_data - [NAND Interface] Detect and correct bit error(s) |
| * @mtd: MTD block structure |
| * @dat: raw data read from the chip |
| * @store_ecc: ECC from the chip |
| * @calc_ecc: the ECC calculated from raw data |
| * |
| * Detect and correct a 1 bit error for 256 byte block |
| */ |
| int mv_nand_correct_data_rs(struct mtd_info *mtd, u_char *data, u_char *store_ecc, u_char *calc_ecc); |
| |
| static void mv_nand_enable_hwecc(struct mtd_info *mtd, int mode); |
| #endif /* _NAND_LNC_H_ */ |
| |
