2 * Copyright © 2009 - Maxim Levitsky
3 * Common routines & support for xD format
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.
9 #include <linux/kernel.h>
10 #include <linux/mtd/nand.h>
11 #include "sm_common.h"
13 static struct nand_ecclayout nand_oob_sm = {
15 .eccpos = {8, 9, 10, 13, 14, 15},
17 {.offset = 0 , .length = 4}, /* reserved */
18 {.offset = 6 , .length = 2}, /* LBA1 */
19 {.offset = 11, .length = 2} /* LBA2 */
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 */
29 static struct nand_ecclayout nand_oob_sm_small = {
33 {.offset = 3 , .length = 2}, /* reserved */
34 {.offset = 6 , .length = 2}, /* LBA1 */
39 static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
41 struct mtd_oob_ops ops;
45 memset(&oob, -1, SM_OOB_SIZE);
46 oob.block_status = 0x0F;
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;
52 ops.ooblen = mtd->oobsize;
53 ops.oobbuf = (void *)&oob;
57 ret = mtd->write_oob(mtd, ofs, &ops);
58 if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
60 "sm_common: can't mark sector at %i as bad\n",
64 mtd->ecc_stats.badblocks++;
70 int sm_register_device(struct mtd_info *mtd)
72 struct nand_chip *chip = (struct nand_chip *)mtd->priv;
75 chip->options |= NAND_SKIP_BBTSCAN | NAND_SMARTMEDIA;
77 /* Scan for card properties */
78 ret = nand_scan_ident(mtd, 1, NULL);
83 /* Bad block marker postion */
84 chip->badblockpos = 0x05;
85 chip->badblockbits = 7;
86 chip->block_markbad = sm_block_markbad;
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;
96 ret = nand_scan_tail(mtd);
101 return add_mtd_device(mtd);
103 EXPORT_SYMBOL_GPL(sm_register_device);
105 MODULE_LICENSE("GPL");
106 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
107 MODULE_DESCRIPTION("Common SmartMedia/xD functions");