Commit 7a2b89ac authored by Huang Shijie's avatar Huang Shijie Committed by Brian Norris
Browse files

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



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: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 3723e93c

drivers/mtd/nand/gpmi-nand/gpmi-nand.c

+20 −9
Original line number Diff line number Diff line
@@ -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.

	 */

	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)

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