rename target/linux/generic-2.6 to generic

[15.05/openwrt.git] / target / linux / generic / files / fs / yaffs2 / yaffs_ecc.h

diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h b/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h
new file mode 100644 (file)
index 0000000..79bc3d1
--- /dev/null
+++ b/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+ /*
+  * This code implements the ECC algorithm used in SmartMedia.
+  *
+  * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+  * The two unused bit are set to 1.
+  * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
+  * blocks are used on a 512-byte NAND page.
+  *
+  */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+typedef struct {
+       unsigned char colParity;
+       unsigned lineParity;
+       unsigned lineParityPrime;
+} yaffs_ECCOther;
+
+void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
+                    const unsigned char *test_ecc);
+
+void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
+                            yaffs_ECCOther * ecc);
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
+                         yaffs_ECCOther * read_ecc,
+                         const yaffs_ECCOther * test_ecc);
+#endif