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[MTD] [NAND] Bug on atmel_nand HW ECC : OOB info not correctly written 

The functions that write the OOB info (on hardware ECC only) use the 
HW_SYNDROME method.

This is not correct : the start position is "pos = eccsize + chunk" and 
should be eccsize. So, the standard (nand_write_oob_std) function should 
be used. This patch corrects this by using NAND_ECC_HW instead of 
NAND_ECC_HW_SYNDROME.

This has only been tested on small pages nand flash.
(if anyone can test it on large pages that would be great).

kernel version : 2.6.27-rc2 (current git mtd-2.6)

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Richard Genoud 2008-10-12 08:42:28 +02:00 коммит произвёл David Woodhouse
Родитель 08d7904329
Коммит 3fc2389847
1 изменённых файлов: 6 добавлений и 52 удалений
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58
drivers/mtd/nand/atmel_nand.c
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@ -173,48 +173,6 @@ static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len)
__raw_writesw(nand_chip->IO_ADDR_W, buf, len / 2);
}
/*
* write oob for small pages
*/
static int atmel_nand_write_oob_512(struct mtd_info *mtd,
struct nand_chip *chip, int page)
{
int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
int eccsize = chip->ecc.size, length = mtd->oobsize;
int len, pos, status = 0;
const uint8_t *bufpoi = chip->oob_poi;
pos = eccsize + chunk;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page);
len = min_t(int, length, chunk);
chip->write_buf(mtd, bufpoi, len);
bufpoi += len;
length -= len;
if (length > 0)
chip->write_buf(mtd, bufpoi, length);
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
return status & NAND_STATUS_FAIL ? -EIO : 0;
}
/*
* read oob for small pages
*/
static int atmel_nand_read_oob_512(struct mtd_info *mtd,
struct nand_chip *chip, int page, int sndcmd)
{
if (sndcmd) {
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
sndcmd = 0;
}
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
return sndcmd;
}
/*
* Calculate HW ECC
*
@ -235,14 +193,14 @@ static int atmel_nand_calculate(struct mtd_info *mtd,
/* get the first 2 ECC bytes */
ecc_value = ecc_readl(host->ecc, PR);
ecc_code[eccpos[0]] = ecc_value & 0xFF;
ecc_code[eccpos[1]] = (ecc_value >> 8) & 0xFF;
ecc_code[0] = ecc_value & 0xFF;
ecc_code[1] = (ecc_value >> 8) & 0xFF;
/* get the last 2 ECC bytes */
ecc_value = ecc_readl(host->ecc, NPR) & ATMEL_ECC_NPARITY;
ecc_code[eccpos[2]] = ecc_value & 0xFF;
ecc_code[eccpos[3]] = (ecc_value >> 8) & 0xFF;
ecc_code[2] = ecc_value & 0xFF;
ecc_code[3] = (ecc_value >> 8) & 0xFF;
return 0;
}
@ -476,14 +434,12 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
res = -EIO;
goto err_ecc_ioremap;
}
nand_chip->ecc.mode = NAND_ECC_HW_SYNDROME;
nand_chip->ecc.mode = NAND_ECC_HW;
nand_chip->ecc.calculate = atmel_nand_calculate;
nand_chip->ecc.correct = atmel_nand_correct;
nand_chip->ecc.hwctl = atmel_nand_hwctl;
nand_chip->ecc.read_page = atmel_nand_read_page;
nand_chip->ecc.bytes = 4;
nand_chip->ecc.prepad = 0;
nand_chip->ecc.postpad = 0;
}
nand_chip->chip_delay = 20; /* 20us command delay time */
@ -514,7 +470,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
goto err_scan_ident;
}
if (nand_chip->ecc.mode == NAND_ECC_HW_SYNDROME) {
if (nand_chip->ecc.mode == NAND_ECC_HW) {
/* ECC is calculated for the whole page (1 step) */
nand_chip->ecc.size = mtd->writesize;
@ -522,8 +478,6 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
switch (mtd->writesize) {
case 512:
nand_chip->ecc.layout = &atmel_oobinfo_small;
nand_chip->ecc.read_oob = atmel_nand_read_oob_512;
nand_chip->ecc.write_oob = atmel_nand_write_oob_512;
ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
break;
case 1024: