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mtd: mtd_nandecctest: add single bit error correction test 

This adds the single bit error correction test case listed below:

Prepare data block without corruption and ECC data with single bit error,
and verify that the data block is preserved by __nand_correct_data().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Akinobu Mita 2012-09-08 01:48:09 +09:00 committed by David Woodhouse
parent ccaa67956c
commit 200ab8454c
1 changed files with 37 additions and 0 deletions
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37
drivers/mtd/tests/mtd_nandecctest.c
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@ -48,6 +48,31 @@ static void single_bit_error_data(void *error_data, void *correct_data,
__change_bit_le(offset, error_data);
}
static unsigned int random_ecc_bit(size_t size)
{
unsigned int offset = random32() % (3 * BITS_PER_BYTE);
if (size == 256) {
/*
* Don't inject a bit error into the insignificant bits (16th
* and 17th bit) in ECC code for 256 byte data block
*/
while (offset == 16 || offset == 17)
offset = random32() % (3 * BITS_PER_BYTE);
}
return offset;
}
static void single_bit_error_ecc(void *error_ecc, void *correct_ecc,
size_t size)
{
unsigned int offset = random_ecc_bit(size);
memcpy(error_ecc, correct_ecc, 3);
__change_bit_le(offset, error_ecc);
}
static void no_bit_error(void *error_data, void *error_ecc,
void *correct_data, void *correct_ecc, const size_t size)
{
@ -76,6 +101,13 @@ static void single_bit_error_in_data(void *error_data, void *error_ecc,
memcpy(error_ecc, correct_ecc, 3);
}
static void single_bit_error_in_ecc(void *error_data, void *error_ecc,
void *correct_data, void *correct_ecc, const size_t size)
{
memcpy(error_data, correct_data, size);
single_bit_error_ecc(error_ecc, correct_ecc, size);
}
static int single_bit_error_correct(void *error_data, void *error_ecc,
void *correct_data, const size_t size)
{
@ -101,6 +133,11 @@ static const struct nand_ecc_test nand_ecc_test[] = {
.prepare = single_bit_error_in_data,
.verify = single_bit_error_correct,
},
{
.name = "single-bit-error-in-ecc-correct",
.prepare = single_bit_error_in_ecc,
.verify = single_bit_error_correct,
},
};
static void dump_data_ecc(void *error_data, void *error_ecc, void *correct_data,