| Maxim Levitsky | 9fc51a3 | 2010-02-22 20:39:39 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright © 2009 - Maxim Levitsky |
| 3 | * Common routines & support for xD format |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/mtd/nand.h> |
| 11 | #include "sm_common.h" |
| 12 | |
| 13 | static struct nand_ecclayout nand_oob_sm = { |
| 14 | .eccbytes = 6, |
| 15 | .eccpos = {8, 9, 10, 13, 14, 15}, |
| 16 | .oobfree = { |
| 17 | {.offset = 0 , .length = 4}, /* reserved */ |
| 18 | {.offset = 6 , .length = 2}, /* LBA1 */ |
| 19 | {.offset = 11, .length = 2} /* LBA2 */ |
| 20 | } |
| 21 | }; |
| 22 | |
| 23 | /* NOTE: This layout is is not compatabable with SmartMedia, */ |
| 24 | /* because the 256 byte devices have page depenent oob layout */ |
| 25 | /* However it does preserve the bad block markers */ |
| 26 | /* If you use smftl, it will bypass this and work correctly */ |
| 27 | /* If you not, then you break SmartMedia compliance anyway */ |
| 28 | |
| 29 | static struct nand_ecclayout nand_oob_sm_small = { |
| 30 | .eccbytes = 3, |
| 31 | .eccpos = {0, 1, 2}, |
| 32 | .oobfree = { |
| 33 | {.offset = 3 , .length = 2}, /* reserved */ |
| 34 | {.offset = 6 , .length = 2}, /* LBA1 */ |
| 35 | } |
| 36 | }; |
| 37 | |
| 38 | |
| 39 | static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs) |
| 40 | { |
| 41 | struct mtd_oob_ops ops; |
| 42 | struct sm_oob oob; |
| 43 | int ret, error = 0; |
| 44 | |
| 45 | memset(&oob, -1, SM_OOB_SIZE); |
| 46 | oob.block_status = 0x0F; |
| 47 | |
| 48 | /* As long as this function is called on erase block boundaries |
| 49 | it will work correctly for 256 byte nand */ |
| 50 | ops.mode = MTD_OOB_PLACE; |
| 51 | ops.ooboffs = 0; |
| 52 | ops.ooblen = mtd->oobsize; |
| 53 | ops.oobbuf = (void *)&oob; |
| 54 | ops.datbuf = NULL; |
| 55 | |
| 56 | |
| 57 | ret = mtd->write_oob(mtd, ofs, &ops); |
| 58 | if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) { |
| 59 | printk(KERN_NOTICE |
| 60 | "sm_common: can't mark sector at %i as bad\n", |
| 61 | (int)ofs); |
| 62 | error = -EIO; |
| 63 | } else |
| 64 | mtd->ecc_stats.badblocks++; |
| 65 | |
| 66 | return error; |
| 67 | } |
| 68 | |
| 69 | |
| 70 | int sm_register_device(struct mtd_info *mtd) |
| 71 | { |
| 72 | struct nand_chip *chip = (struct nand_chip *)mtd->priv; |
| 73 | int ret; |
| 74 | |
| 75 | chip->options |= NAND_SKIP_BBTSCAN | NAND_SMARTMEDIA; |
| 76 | |
| 77 | /* Scan for card properties */ |
| 78 | ret = nand_scan_ident(mtd, 1); |
| 79 | |
| 80 | if (ret) |
| 81 | return ret; |
| 82 | |
| 83 | /* Bad block marker postion */ |
| 84 | chip->badblockpos = 0x05; |
| 85 | chip->badblockbits = 7; |
| 86 | chip->block_markbad = sm_block_markbad; |
| 87 | |
| 88 | /* ECC layout */ |
| 89 | if (mtd->writesize == SM_SECTOR_SIZE) |
| 90 | chip->ecc.layout = &nand_oob_sm; |
| 91 | else if (mtd->writesize == SM_SMALL_PAGE) |
| 92 | chip->ecc.layout = &nand_oob_sm_small; |
| 93 | else |
| 94 | return -ENODEV; |
| 95 | |
| 96 | ret = nand_scan_tail(mtd); |
| 97 | |
| 98 | if (ret) |
| 99 | return ret; |
| 100 | |
| 101 | return add_mtd_device(mtd); |
| 102 | } |
| 103 | EXPORT_SYMBOL_GPL(sm_register_device); |
| 104 | |
| 105 | MODULE_LICENSE("GPL"); |
| 106 | MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); |
| 107 | MODULE_DESCRIPTION("Common SmartMedia/xD functions"); |