[MTD] NAND: Add ECC debugging for CAFÉ
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/nand/cafe_ecc.c b/drivers/mtd/nand/cafe_ecc.c
index 4621460..2d29265 100644
--- a/drivers/mtd/nand/cafe_ecc.c
+++ b/drivers/mtd/nand/cafe_ecc.c
@@ -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 @@
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 @@
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];
}