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Commit 41b207a7 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

mtd: nand: implement the default mtd_ooblayout_ops 



Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 1bd0b247

drivers/mtd/nand/nand_base.c

+93 −49
Original line number Diff line number Diff line
@@ -47,54 +47,96 @@ 
#include <linux/mtd/partitions.h>

#include <linux/of_mtd.h>



static int nand_get_device(struct mtd_info *mtd, int new_state);



static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,

			     struct mtd_oob_ops *ops);



/* Define default oob placement schemes for large and small page devices */

static struct nand_ecclayout nand_oob_8 = {

	.eccbytes = 3,

	.eccpos = {0, 1, 2},

	.oobfree = {

		{.offset = 3,

		 .length = 2},

		{.offset = 6,

		 .length = 2} }

};

static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,

				 struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct nand_ecc_ctrl *ecc = &chip->ecc;



static struct nand_ecclayout nand_oob_16 = {

	.eccbytes = 6,

	.eccpos = {0, 1, 2, 3, 6, 7},

	.oobfree = {

		{.offset = 8,

		 . length = 8} }

};

	if (section > 1)

		return -ERANGE;



static struct nand_ecclayout nand_oob_64 = {

	.eccbytes = 24,

	.eccpos = {

		   40, 41, 42, 43, 44, 45, 46, 47,

		   48, 49, 50, 51, 52, 53, 54, 55,

		   56, 57, 58, 59, 60, 61, 62, 63},

	.oobfree = {

		{.offset = 2,

		 .length = 38} }

};

	if (!section) {

		oobregion->offset = 0;

		oobregion->length = 4;

	} else {

		oobregion->offset = 6;

		oobregion->length = ecc->total - 4;

	}



static struct nand_ecclayout nand_oob_128 = {

	.eccbytes = 48,

	.eccpos = {

		   80, 81, 82, 83, 84, 85, 86, 87,

		   88, 89, 90, 91, 92, 93, 94, 95,

		   96, 97, 98, 99, 100, 101, 102, 103,

		   104, 105, 106, 107, 108, 109, 110, 111,

		   112, 113, 114, 115, 116, 117, 118, 119,

		   120, 121, 122, 123, 124, 125, 126, 127},

	.oobfree = {

		{.offset = 2,

		 .length = 78} }

	return 0;

}



static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,

				  struct mtd_oob_region *oobregion)

{

	if (section > 1)

		return -ERANGE;



	if (mtd->oobsize == 16) {

		if (section)

			return -ERANGE;



		oobregion->length = 8;

		oobregion->offset = 8;

	} else {

		oobregion->length = 2;

		if (!section)

			oobregion->offset = 3;

		else

			oobregion->offset = 6;

	}



	return 0;

}



const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {

	.ecc = nand_ooblayout_ecc_sp,

	.free = nand_ooblayout_free_sp,

};

EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);



static int nand_get_device(struct mtd_info *mtd, int new_state);

static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,

				 struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct nand_ecc_ctrl *ecc = &chip->ecc;



static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,

			     struct mtd_oob_ops *ops);

	if (section)

		return -ERANGE;



	oobregion->length = ecc->total;

	oobregion->offset = mtd->oobsize - oobregion->length;



	return 0;

}



static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,

				  struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct nand_ecc_ctrl *ecc = &chip->ecc;



	if (section)

		return -ERANGE;



	oobregion->length = mtd->oobsize - ecc->total - 2;

	oobregion->offset = 2;



	return 0;

}



const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {

	.ecc = nand_ooblayout_ecc_lp,

	.free = nand_ooblayout_free_lp,

};

EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);



static int check_offs_len(struct mtd_info *mtd,

					loff_t ofs, uint64_t len)
@@ -4109,22 +4151,25 @@ int nand_scan_tail(struct mtd_info *mtd) 
	/* Set the internal oob buffer location, just after the page data */

	chip->oob_poi = chip->buffers->databuf + mtd->writesize;



	/*

	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core

	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will

	 * set ->ooblayout to the default ecclayout wrapper.

	 */

	mtd_set_ecclayout(mtd, ecc->layout);



	/*

	 * If no default placement scheme is given, select an appropriate one.

	 */

	if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {

	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {

		switch (mtd->oobsize) {

		case 8:

			ecc->layout = &nand_oob_8;

			break;

		case 16:

			ecc->layout = &nand_oob_16;

			mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);

			break;

		case 64:

			ecc->layout = &nand_oob_64;

			break;

		case 128:

			ecc->layout = &nand_oob_128;

			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);

			break;

		default:

			WARN(1, "No oob scheme defined for oobsize %d\n",
@@ -4285,7 +4330,6 @@ int nand_scan_tail(struct mtd_info *mtd) 
		ecc->write_oob_raw = ecc->write_oob;



	/* propagate ecc info to mtd_info */

	mtd_set_ecclayout(mtd, ecc->layout);

	mtd->ecc_strength = ecc->strength;

	mtd->ecc_step_size = ecc->size;

include/linux/mtd/nand.h

+3 −0
Original line number Diff line number Diff line
@@ -748,6 +748,9 @@ struct nand_chip { 
	void *priv;

};



extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;

extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;



static inline void nand_set_flash_node(struct nand_chip *chip,

				       struct device_node *np)

{