1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/list.h>
4 #include <linux/random.h>
5 #include <linux/string.h>
6 #include <linux/bitops.h>
7 #include <linux/jiffies.h>
8 #include <linux/mtd/nand_ecc.h>
10 #if defined(CONFIG_MTD_NAND) || defined(CONFIG_MTD_NAND_MODULE)
12 static void inject_single_bit_error(void *data
, size_t size
)
14 unsigned long offset
= random32() % (size
* BITS_PER_BYTE
);
16 __change_bit(offset
, data
);
19 static unsigned char data
[512];
20 static unsigned char error_data
[512];
22 static int nand_ecc_test(const size_t size
)
24 unsigned char code
[3];
25 unsigned char error_code
[3];
28 BUG_ON(sizeof(data
) < size
);
30 sprintf(testname
, "nand-ecc-%zu", size
);
32 get_random_bytes(data
, size
);
34 memcpy(error_data
, data
, size
);
35 inject_single_bit_error(error_data
, size
);
37 __nand_calculate_ecc(data
, size
, code
);
38 __nand_calculate_ecc(error_data
, size
, error_code
);
39 __nand_correct_data(error_data
, code
, error_code
, size
);
41 if (!memcmp(data
, error_data
, size
)) {
42 printk(KERN_INFO
"mtd_nandecctest: ok - %s\n", testname
);
46 printk(KERN_ERR
"mtd_nandecctest: not ok - %s\n", testname
);
48 printk(KERN_DEBUG
"hexdump of data:\n");
49 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_OFFSET
, 16, 4,
51 printk(KERN_DEBUG
"hexdump of error data:\n");
52 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_OFFSET
, 16, 4,
53 error_data
, size
, false);
60 static int nand_ecc_test(const size_t size
)
67 static int __init
ecc_test_init(void)
77 static void __exit
ecc_test_exit(void)
81 module_init(ecc_test_init
);
82 module_exit(ecc_test_exit
);
84 MODULE_DESCRIPTION("NAND ECC function test module");
85 MODULE_AUTHOR("Akinobu Mita");
86 MODULE_LICENSE("GPL");
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