Mercurial > yaffs-ecoscentric-gpl

annotate packages/fs/yaffs/current/src/yaffs_ecc.h @ 425:dea4d7d250ad ecos

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Move sources into packages/fs/yaffs/current/src/
author Ross Younger <wry@ecoscentric.com>
date Fri, 14 May 2010 16:03:09 +0100
parents yaffs_ecc.h@b5309c9b6d7f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
1 /*
198
b7f785925166 Cleanup patch - Remove all trailing whitespace and fix a few typos.
wookey <wookey>
parents: 168
diff changeset
2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
3 *
409
b5309c9b6d7f yaffs Some cleanups.
Charles Manning <cdhmanning@gmail.com>
parents: 271
diff changeset
4 * Copyright (C) 2002-2010 Aleph One Ltd.
168
b8f20fdc3a58 normalise licence headers and attributions
wookey <wookey>
parents: 75
diff changeset
5 * for Toby Churchill Ltd and Brightstar Engineering
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
6 *
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
7 * Created by Charles Manning <charles@aleph1.co.uk>
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
8 *
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
9 * This program is free software; you can redistribute it and/or modify
168
b8f20fdc3a58 normalise licence headers and attributions
wookey <wookey>
parents: 75
diff changeset
10 * it under the terms of the GNU Lesser General Public License version 2.1 as
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
11 * published by the Free Software Foundation.
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
12 *
168
b8f20fdc3a58 normalise licence headers and attributions
wookey <wookey>
parents: 75
diff changeset
13 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
14 */
75
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
15
271
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
16 /*
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
17 * This code implements the ECC algorithm used in SmartMedia.
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
18 *
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
19 * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
20 * The two unused bit are set to 1.
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
21 * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
22 * blocks are used on a 512-byte NAND page.
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
23 *
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
24 */
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
25
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
26 #ifndef __YAFFS_ECC_H__
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
27 #define __YAFFS_ECC_H__
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
28
75
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
29 typedef struct {
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
30 unsigned char colParity;
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
31 unsigned lineParity;
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
32 unsigned lineParityPrime;
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
33 } yaffs_ECCOther;
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
34
75
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
35 void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
36 int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
271
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
37 const unsigned char *test_ecc);
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
38
75
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
39 void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
271
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
40 yaffs_ECCOther *ecc);
75
a99f66adbe4f Lindent
charles <charles>
parents: 0
diff changeset
41 int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
271
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
42 yaffs_ECCOther *read_ecc,
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
wookey <wookey>
parents: 198
diff changeset
43 const yaffs_ECCOther *test_ecc);
0
d6394059fa1d *** empty log message ***
charles <charles>
parents:
diff changeset
44 #endif