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[MTD] NAND: Add ECC debugging for CAFÉ

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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2006-10-27 15:40:51 +03:00
parent b478c775a0
commit 7608194c4a
1 changed files with 36 additions and 3 deletions
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39
drivers/mtd/nand/cafe_ecc.c
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@ -19,6 +19,7 @@
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
static unsigned short gf4096_mul(unsigned short, unsigned short);
@ -1322,16 +1323,43 @@ void correct_12bit_symbol(unsigned char *buf, unsigned short sym,
buf[2+(3*(sym-2))/2] ^= (val >> 8);
buf[3+(3*(sym-2))/2] ^= (val & 0xff);
}
}
static int debugecc = 0;
module_param(debugecc, int, 0644);
int cafe_correct_ecc(unsigned char *buf,
unsigned short *chk_syndrome_list)
{
unsigned short err_info[9];
int i;
if (debugecc) {
printk(KERN_WARNING "cafe_correct_ecc invoked. Syndromes %x %x %x %x %x %x %x %x\n",
chk_syndrome_list[0], chk_syndrome_list[1],
chk_syndrome_list[2], chk_syndrome_list[3],
chk_syndrome_list[4], chk_syndrome_list[5],
chk_syndrome_list[6], chk_syndrome_list[7]);
for (i=0; i < 2048; i+=16) {
printk(KERN_WARNING "D %04x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
i,
buf[i], buf[i+1], buf[i+2], buf[i+3],
buf[i+4], buf[i+5], buf[i+6], buf[i+7],
buf[i+8], buf[i+9], buf[i+10], buf[i+11],
buf[i+12], buf[i+13], buf[i+14], buf[i+15]);
}
for ( ; i < 2112; i+=16) {
printk(KERN_WARNING "O %02x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
i - 2048,
buf[i], buf[i+1], buf[i+2], buf[i+3],
buf[i+4], buf[i+5], buf[i+6], buf[i+7],
buf[i+8], buf[i+9], buf[i+10], buf[i+11],
buf[i+12], buf[i+13], buf[i+14], buf[i+15]);
}
}
if (chk_no_err_only(chk_syndrome_list, err_info) &&
chk_1_err_only(chk_syndrome_list, err_info) &&
chk_2_err_only(chk_syndrome_list, err_info) &&
@ -1340,8 +1368,13 @@ int cafe_correct_ecc(unsigned char *buf,
return -EIO;
}
for (i=0; i < err_info[0]; i++)
for (i=0; i < err_info[0]; i++) {
if (debugecc)
printk(KERN_WARNING "Correct symbol %d with 0x%03x\n",
err_info[1+i], err_info[5+i]);
correct_12bit_symbol(buf, err_info[1+i], err_info[5+i]);
}
return err_info[0];
}