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Commit 35d0e24f authored by Boris Brezillon's avatar Boris Brezillon Committed by Brian Norris
Browse files

mtd: nand: sunxi: factorize extra OOB bytes handling 



Add helper functions to factorize the code dealing extra OOB bytes in the
normal and syndrome ECC implementations.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent b462551c

drivers/mtd/nand/sunxi_nand.c

+48 −42
Original line number Diff line number Diff line
@@ -621,6 +621,26 @@ static int sunxi_nfc_hw_ecc_read_chunk(struct mtd_info *mtd, 
	return 0;

}



static void sunxi_nfc_hw_ecc_read_extra_oob(struct mtd_info *mtd,

					    u8 *oob, int *cur_off)

{

	struct nand_chip *nand = mtd->priv;

	struct nand_ecc_ctrl *ecc = &nand->ecc;

	int offset = ((ecc->bytes + 4) * ecc->steps);

	int len = mtd->oobsize - offset;



	if (len <= 0)

		return;



	if (*cur_off != offset)

		nand->cmdfunc(mtd, NAND_CMD_RNDOUT,

			      offset + mtd->writesize, -1);



	sunxi_nfc_read_buf(mtd, oob + offset, len);



	*cur_off = mtd->oobsize + mtd->writesize;

}



static int sunxi_nfc_hw_ecc_write_chunk(struct mtd_info *mtd,

					const u8 *data, int data_off,

					const u8 *oob, int oob_off,
@@ -659,6 +679,26 @@ static int sunxi_nfc_hw_ecc_write_chunk(struct mtd_info *mtd, 
	return 0;

}



static void sunxi_nfc_hw_ecc_write_extra_oob(struct mtd_info *mtd,

					     u8 *oob, int *cur_off)

{

	struct nand_chip *nand = mtd->priv;

	struct nand_ecc_ctrl *ecc = &nand->ecc;

	int offset = ((ecc->bytes + 4) * ecc->steps);

	int len = mtd->oobsize - offset;



	if (len <= 0)

		return;



	if (*cur_off != offset)

		nand->cmdfunc(mtd, NAND_CMD_RNDIN,

			      offset + mtd->writesize, -1);



	sunxi_nfc_write_buf(mtd, oob + offset, len);



	*cur_off = mtd->oobsize + mtd->writesize;

}



static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,

				      struct nand_chip *chip, uint8_t *buf,

				      int oob_required, int page)
@@ -666,8 +706,6 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd, 
	struct nand_ecc_ctrl *ecc = &chip->ecc;

	unsigned int max_bitflips = 0;

	int ret, i, cur_off = 0;

	int offset;

	int cnt;



	sunxi_nfc_hw_ecc_enable(mtd);
@@ -684,16 +722,8 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd, 
			return ret;

	}



	if (oob_required) {

		cnt = ecc->layout->oobfree[ecc->steps].length;

		if (cnt > 0) {

			offset = mtd->writesize +

				 ecc->layout->oobfree[ecc->steps].offset;

			chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset, -1);

			offset -= mtd->writesize;

			chip->read_buf(mtd, chip->oob_poi + offset, cnt);

		}

	}

	if (oob_required)

		sunxi_nfc_hw_ecc_read_extra_oob(mtd, chip->oob_poi, &cur_off);



	sunxi_nfc_hw_ecc_disable(mtd);
@@ -706,8 +736,6 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd, 
{

	struct nand_ecc_ctrl *ecc = &chip->ecc;

	int ret, i, cur_off = 0;

	int offset;

	int cnt;



	sunxi_nfc_hw_ecc_enable(mtd);
@@ -724,16 +752,8 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd, 
			return ret;

	}



	if (oob_required) {

		cnt = ecc->layout->oobfree[i].length;

		if (cnt > 0) {

			offset = mtd->writesize +

				 ecc->layout->oobfree[i].offset;

			chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset, -1);

			offset -= mtd->writesize;

			chip->write_buf(mtd, chip->oob_poi + offset, cnt);

		}

	}

	if (oob_required)

		sunxi_nfc_hw_ecc_write_extra_oob(mtd, chip->oob_poi, &cur_off);



	sunxi_nfc_hw_ecc_disable(mtd);
@@ -748,7 +768,6 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd, 
	struct nand_ecc_ctrl *ecc = &chip->ecc;

	unsigned int max_bitflips = 0;

	int ret, i, cur_off = 0;

	int cnt;



	sunxi_nfc_hw_ecc_enable(mtd);
@@ -765,14 +784,8 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd, 
			return ret;

	}



	if (oob_required) {

		cnt = mtd->writesize + mtd->oobsize - cur_off;

		if (cnt > 0) {

			u8 *oob = chip->oob_poi + mtd->oobsize - cnt;



			chip->read_buf(mtd, oob, cnt);

		}

	}

	if (oob_required)

		sunxi_nfc_hw_ecc_read_extra_oob(mtd, chip->oob_poi, &cur_off);



	sunxi_nfc_hw_ecc_disable(mtd);
@@ -786,7 +799,6 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd, 
{

	struct nand_ecc_ctrl *ecc = &chip->ecc;

	int ret, i, cur_off = 0;

	int cnt;



	sunxi_nfc_hw_ecc_enable(mtd);
@@ -802,14 +814,8 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd, 
			return ret;

	}



	if (oob_required) {

		cnt = mtd->writesize + mtd->oobsize - cur_off;

		if (cnt > 0) {

			u8 *oob = chip->oob_poi + mtd->oobsize - cnt;



			chip->write_buf(mtd, oob, cnt);

		}

	}

	if (oob_required)

		sunxi_nfc_hw_ecc_write_extra_oob(mtd, chip->oob_poi, &cur_off);



	sunxi_nfc_hw_ecc_disable(mtd);