projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9fc51a37 ML |
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 */ | |
| 5e81e88a | 78 | ret = nand_scan_ident(mtd, 1, NULL); |
| 9fc51a37 ML |
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"); |