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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#include "NandSpareScheme.h"
#include <utility/assert.h>
//------------------------------------------------------------------------------
// Exported variables
//------------------------------------------------------------------------------
/// Spare area placement scheme for 256 byte pages.
const struct NandSpareScheme nandSpareScheme256 = {
// Bad block marker is at position #5
5,
// 3 ecc bytes
3,
// Ecc bytes positions
{0, 1, 2},
// 4 extra bytes
4,
// Extra bytes positions
{3, 4, 6, 7}
};
/// Spare area placement scheme for 512 byte pages.
const struct NandSpareScheme nandSpareScheme512 = {
// Bad block marker is at position #5
5,
// 6 ecc bytes
6,
// Ecc bytes positions
{0, 1, 2, 3, 6, 7},
// 8 extra bytes
8,
// Extra bytes positions
{8, 9, 10, 11, 12, 13, 14, 15}
};
/// Spare area placement scheme for 2048 byte pages.
const struct NandSpareScheme nandSpareScheme2048 = {
// Bad block marker is at position #0
0,
// 24 ecc bytes
24,
// Ecc bytes positions
{40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60, 61, 62, 63},
// 38 extra bytes
38,
// Extra bytes positions
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39}
};
/// Spare area placement scheme for 4096 byte pages.
const struct NandSpareScheme nandSpareScheme4096 = {
// Bad block marker is at position #0
0,
// 48 ecc bytes
48,
// Ecc bytes positions
{ 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94,
95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124,
125, 126, 127},
// 78 extra bytes
78,
// Extra bytes positions
{ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
78, 79}
};
//------------------------------------------------------------------------------
// Exported functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Reads the bad block marker inside a spare area buffer using the provided
/// scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param marker Pointer to the variable to store the bad block marker.
//------------------------------------------------------------------------------
void NandSpareScheme_ReadBadBlockMarker(
const struct NandSpareScheme *scheme,
const unsigned char *spare,
unsigned char *marker)
{
*marker = spare[scheme->badBlockMarkerPosition];
}
//------------------------------------------------------------------------------
/// Modifies the bad block marker inside a spare area, using the given scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param marker Bad block marker to write.
//------------------------------------------------------------------------------
void NandSpareScheme_WriteBadBlockMarker(
const struct NandSpareScheme *scheme,
unsigned char *spare,
unsigned char marker)
{
spare[scheme->badBlockMarkerPosition] = marker;
}
//------------------------------------------------------------------------------
/// Reads ECC information from a spare area using the provided scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param ecc ECC buffer.
//------------------------------------------------------------------------------
void NandSpareScheme_ReadEcc(
const struct NandSpareScheme *scheme,
const unsigned char *spare,
unsigned char *ecc)
{
unsigned int i;
for (i=0; i < scheme->numEccBytes; i++) {
ecc[i] = spare[scheme->eccBytesPositions[i]];
}
}
//------------------------------------------------------------------------------
/// Writes ECC information in a spare area, using a particular scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param ecc ECC buffer.
//------------------------------------------------------------------------------
void NandSpareScheme_WriteEcc(
const struct NandSpareScheme *scheme,
unsigned char *spare,
const unsigned char *ecc)
{
unsigned int i;
for (i=0; i < scheme->numEccBytes; i++) {
spare[scheme->eccBytesPositions[i]] = ecc[i];
}
}
//------------------------------------------------------------------------------
/// Reads extra bytes of information from a spare area, using the provided
/// scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param extra Extra bytes buffer.
/// \param size Number of extra bytes to read.
/// \param offset Index where to read the first extra byte.
//------------------------------------------------------------------------------
void NandSpareScheme_ReadExtra(
const struct NandSpareScheme *scheme,
const unsigned char *spare,
void *extra,
unsigned char size,
unsigned char offset)
{
ASSERT((size + offset) < scheme->numExtraBytes,
"NandSpareScheme_ReadExtra: Too many bytes\n\r");
unsigned int i;
for (i=0; i < size; i++) {
((unsigned char *) extra)[i] = spare[scheme->extraBytesPositions[i+offset]];
}
}
//------------------------------------------------------------------------------
/// Write extra bytes of information inside a spare area, using the provided
/// scheme.
/// \param scheme Pointer to a NandSpareScheme instance.
/// \param spare Spare area buffer.
/// \param extra Extra bytes to write.
/// \param size Number of extra bytes to write.
/// \param offset Index where to write the first extra byte.
//------------------------------------------------------------------------------
void NandSpareScheme_WriteExtra(
const struct NandSpareScheme *scheme,
unsigned char *spare,
const void *extra,
unsigned char size,
unsigned char offset)
{
ASSERT((size + offset) < scheme->numExtraBytes,
"NandSpareScheme_WriteExtra: Too many bytes\n\r");
unsigned int i;
for (i=0; i < size; i++) {
spare[scheme->extraBytesPositions[i+offset]] = ((unsigned char *) extra)[i];
}
}
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