/* * sharpslpart.c - MTD partition parser for NAND flash using the SHARP FTL * for logical addressing, as used on the PXA models of the SHARP SL Series. * * Copyright (C) 2017 Andrea Adami <[email protected]> * * Based on SHARP GPL 2.4 sources: * http://support.ezaurus.com/developer/source/source_dl.asp * drivers/mtd/nand/sharp_sl_logical.c * linux/include/asm-arm/sharp_nand_logical.h * * Copyright (C) 2002 SHARP * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/types.h> #include <linux/bitops.h> #include <linux/sizes.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> /* oob structure */ #define NAND_NOOB_LOGADDR_00 … #define NAND_NOOB_LOGADDR_01 … #define NAND_NOOB_LOGADDR_10 … #define NAND_NOOB_LOGADDR_11 … #define NAND_NOOB_LOGADDR_20 … #define NAND_NOOB_LOGADDR_21 … #define BLOCK_IS_RESERVED … #define BLOCK_UNMASK_COMPLEMENT … /* factory defaults */ #define SHARPSL_NAND_PARTS … #define SHARPSL_FTL_PART_SIZE … #define SHARPSL_PARTINFO1_LADDR … #define SHARPSL_PARTINFO2_LADDR … #define BOOT_MAGIC … #define FSRO_MAGIC … #define FSRW_MAGIC … /** * struct sharpsl_ftl - Sharp FTL Logical Table * @logmax: number of logical blocks * @log2phy: the logical-to-physical table * * Structure containing the logical-to-physical translation table * used by the SHARP SL FTL. */ struct sharpsl_ftl { … }; /* verify that the OOB bytes 8 to 15 are free and available for the FTL */ static int sharpsl_nand_check_ooblayout(struct mtd_info *mtd) { … } static int sharpsl_nand_read_oob(struct mtd_info *mtd, loff_t offs, u8 *buf) { … } /* * The logical block number assigned to a physical block is stored in the OOB * of the first page, in 3 16-bit copies with the following layout: * * 01234567 89abcdef * -------- -------- * ECC BB xyxyxy * * When reading we check that the first two copies agree. * In case of error, matching is tried using the following pairs. * Reserved values 0xffff mean the block is kept for wear leveling. * * 01234567 89abcdef * -------- -------- * ECC BB xyxy oob[8]==oob[10] && oob[9]==oob[11] -> byte0=8 byte1=9 * ECC BB xyxy oob[10]==oob[12] && oob[11]==oob[13] -> byte0=10 byte1=11 * ECC BB xy xy oob[12]==oob[8] && oob[13]==oob[9] -> byte0=12 byte1=13 */ static int sharpsl_nand_get_logical_num(u8 *oob) { … } static int sharpsl_nand_init_ftl(struct mtd_info *mtd, struct sharpsl_ftl *ftl) { … } static void sharpsl_nand_cleanup_ftl(struct sharpsl_ftl *ftl) { … } static int sharpsl_nand_read_laddr(struct mtd_info *mtd, loff_t from, size_t len, void *buf, struct sharpsl_ftl *ftl) { … } /* * MTD Partition Parser * * Sample values read from SL-C860 * * # cat /proc/mtd * dev: size erasesize name * mtd0: 006d0000 00020000 "Filesystem" * mtd1: 00700000 00004000 "smf" * mtd2: 03500000 00004000 "root" * mtd3: 04400000 00004000 "home" * * PARTITIONINFO1 * 0x00060000: 00 00 00 00 00 00 70 00 42 4f 4f 54 00 00 00 00 ......p.BOOT.... * 0x00060010: 00 00 70 00 00 00 c0 03 46 53 52 4f 00 00 00 00 ..p.....FSRO.... * 0x00060020: 00 00 c0 03 00 00 00 04 46 53 52 57 00 00 00 00 ........FSRW.... */ struct sharpsl_nand_partinfo { … }; static int sharpsl_nand_read_partinfo(struct mtd_info *master, loff_t from, size_t len, struct sharpsl_nand_partinfo *buf, struct sharpsl_ftl *ftl) { … } static int sharpsl_parse_mtd_partitions(struct mtd_info *master, const struct mtd_partition **pparts, struct mtd_part_parser_data *data) { … } static struct mtd_part_parser sharpsl_mtd_parser = …; module_mtd_part_parser(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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