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mtd: gpmi: rewrite the gpmi_ecc_write_oob() to support the jffs2

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When we use the ECC info which is get from the nand chip's datasheet,
we may have some freed oob area now.

This patch rewrites the gpmi_ecc_write_oob() to implement the ecc.write_oob().
We also update the comment for gpmi_hw_ecclayout.

Yes! We can support the JFFS2 for the SLC nand now.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2013-09-25 14:58:15 +08:00 committed by Brian Norris
parent 3723e93c64
commit 7a2b89acf8
1 changed files with 20 additions and 9 deletions
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29
drivers/mtd/nand/gpmi-nand/gpmi-nand.c
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@ -45,7 +45,10 @@ static struct nand_bbt_descr gpmi_bbt_descr = {
.pattern = scan_ff_pattern
};
/* We will use all the (page + OOB). */
/*
* We may change the layout if we can get the ECC info from the datasheet,
* else we will use all the (page + OOB).
*/
static struct nand_ecclayout gpmi_hw_ecclayout = {
.eccbytes = 0,
.eccpos = { 0, },
@ -1263,14 +1266,22 @@ static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
static int
gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
{
/*
* The BCH will use all the (page + oob).
* Our gpmi_hw_ecclayout can only prohibit the JFFS2 to write the oob.
* But it can not stop some ioctls such MEMWRITEOOB which uses
* MTD_OPS_PLACE_OOB. So We have to implement this function to prohibit
* these ioctls too.
*/
return -EPERM;
struct nand_oobfree *of = mtd->ecclayout->oobfree;
int status = 0;
/* Do we have available oob area? */
if (!of->length)
return -EPERM;
if (!nand_is_slc(chip))
return -EPERM;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of->offset, page);
chip->write_buf(mtd, chip->oob_poi + of->offset, of->length);
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
return status & NAND_STATUS_FAIL ? -EIO : 0;
}
static int gpmi_block_markbad(struct mtd_info *mtd, loff_t ofs)