mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/omap2.c

@@ -1498,9 +1498,8 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
 static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	int i;
+	int ret;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Enable GPMC ecc engine */
 	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1511,8 +1510,10 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Update ecc vector from GPMC result registers */
 	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* Write ecc vector to OOB area */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1539,10 +1540,7 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	uint8_t *oob = &chip->oob_poi[eccpos[0]];
-	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
-	int stat;
+	int stat, ret;
 	unsigned int max_bitflips = 0;
 
 	/* Enable GPMC ecc engine */
@@ -1552,13 +1550,18 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, buf, mtd->writesize);
 
 	/* Read oob bytes */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
-	chip->read_buf(mtd, oob, chip->ecc.total);
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
+		      mtd->writesize + BADBLOCK_MARKER_LENGTH, -1);
+	chip->read_buf(mtd, chip->oob_poi + BADBLOCK_MARKER_LENGTH,
+		       chip->ecc.total);
 
 	/* Calculate ecc bytes */
 	chip->ecc.calculate(mtd, buf, ecc_calc);
 
-	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);