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Commit ef5eeea6 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

mtd: nand: brcm: switch to mtd_ooblayout_ops 



Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent c8766e81

drivers/mtd/nand/brcmnand/brcmnand.c

+157 −101
Original line number Diff line number Diff line
@@ -780,127 +780,183 @@ static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg) 
}



/*

 * Returns a nand_ecclayout strucutre for the given layout/configuration.

 * Returns NULL on failure.

 * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given

 * the layout/configuration.

 * Returns -ERRCODE on failure.

 */

static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,

						     struct brcmnand_host *host)

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

					  struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct brcmnand_host *host = nand_get_controller_data(chip);

	struct brcmnand_cfg *cfg = &host->hwcfg;

	int i, j;

	struct nand_ecclayout *layout;

	int req;

	int sectors;

	int sas;

	int idx1, idx2;



	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);

	if (!layout)

		return NULL;



	sectors = cfg->page_size / (512 << cfg->sector_size_1k);

	sas = cfg->spare_area_size << cfg->sector_size_1k;



	/* Hamming */

	if (is_hamming_ecc(cfg)) {

		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {

			/* First sector of each page may have BBI */

			if (i == 0) {

				layout->oobfree[idx2].offset = i * sas + 1;

				/* Small-page NAND use byte 6 for BBI */

				if (cfg->page_size == 512)

					layout->oobfree[idx2].offset--;

				layout->oobfree[idx2].length = 5;

			} else {

				layout->oobfree[idx2].offset = i * sas;

				layout->oobfree[idx2].length = 6;

			}

			idx2++;

			layout->eccpos[idx1++] = i * sas + 6;

			layout->eccpos[idx1++] = i * sas + 7;

			layout->eccpos[idx1++] = i * sas + 8;

			layout->oobfree[idx2].offset = i * sas + 9;

			layout->oobfree[idx2].length = 7;

			idx2++;

			/* Leave zero-terminated entry for OOBFREE */

			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||

				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)

				break;

		}

	int sas = cfg->spare_area_size << cfg->sector_size_1k;

	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);



		return layout;

	if (section >= sectors)

		return -ERANGE;



	oobregion->offset = (section * sas) + 6;

	oobregion->length = 3;



	return 0;

}



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

					   struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct brcmnand_host *host = nand_get_controller_data(chip);

	struct brcmnand_cfg *cfg = &host->hwcfg;

	int sas = cfg->spare_area_size << cfg->sector_size_1k;

	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);



	if (section >= sectors * 2)

		return -ERANGE;



	oobregion->offset = (section / 2) * sas;



	if (section & 1) {

		oobregion->offset += 9;

		oobregion->length = 7;

	} else {

		oobregion->length = 6;



		/* First sector of each page may have BBI */

		if (!section) {

			/*

	 * CONTROLLER_VERSION:

	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)

	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)

	 * But we will just be conservative.

			 * Small-page NAND use byte 6 for BBI while large-page

			 * NAND use byte 0.

			 */

	req = DIV_ROUND_UP(ecc_level * 14, 8);

	if (req >= sas) {

		dev_err(&host->pdev->dev,

			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",

			req, sas);

		return NULL;

			if (cfg->page_size > 512)

				oobregion->offset++;

			oobregion->length--;

		}

	}



	layout->eccbytes = req * sectors;

	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {

		for (j = sas - req; j < sas && idx1 <

				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)

			layout->eccpos[idx1] = i * sas + j;

	return 0;

}



		/* First sector of each page may have BBI */

		if (i == 0) {

			if (cfg->page_size == 512 && (sas - req >= 6)) {

				/* Small-page NAND use byte 6 for BBI */

				layout->oobfree[idx2].offset = 0;

				layout->oobfree[idx2].length = 5;

				idx2++;

				if (sas - req > 6) {

					layout->oobfree[idx2].offset = 6;

					layout->oobfree[idx2].length =

						sas - req - 6;

					idx2++;

				}

			} else if (sas > req + 1) {

				layout->oobfree[idx2].offset = i * sas + 1;

				layout->oobfree[idx2].length = sas - req - 1;

				idx2++;

			}

		} else if (sas > req) {

			layout->oobfree[idx2].offset = i * sas;

			layout->oobfree[idx2].length = sas - req;

			idx2++;

		}

		/* Leave zero-terminated entry for OOBFREE */

		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||

				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)

			break;

static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {

	.ecc = brcmnand_hamming_ooblayout_ecc,

	.free = brcmnand_hamming_ooblayout_free,

};



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

				      struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct brcmnand_host *host = nand_get_controller_data(chip);

	struct brcmnand_cfg *cfg = &host->hwcfg;

	int sas = cfg->spare_area_size << cfg->sector_size_1k;

	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);



	if (section >= sectors)

		return -ERANGE;



	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;

	oobregion->length = chip->ecc.bytes;



	return 0;

}



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

					  struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct brcmnand_host *host = nand_get_controller_data(chip);

	struct brcmnand_cfg *cfg = &host->hwcfg;

	int sas = cfg->spare_area_size << cfg->sector_size_1k;

	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);



	if (section >= sectors)

		return -ERANGE;



	if (sas <= chip->ecc.bytes)

		return 0;



	oobregion->offset = section * sas;

	oobregion->length = sas - chip->ecc.bytes;



	if (!section) {

		oobregion->offset++;

		oobregion->length--;

	}



	return layout;

	return 0;

}



static struct nand_ecclayout *brcmstb_choose_ecc_layout(

		struct brcmnand_host *host)

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

					  struct mtd_oob_region *oobregion)

{

	struct nand_chip *chip = mtd_to_nand(mtd);

	struct brcmnand_host *host = nand_get_controller_data(chip);

	struct brcmnand_cfg *cfg = &host->hwcfg;

	int sas = cfg->spare_area_size << cfg->sector_size_1k;



	if (section > 1 || sas - chip->ecc.bytes < 6 ||

	    (section && sas - chip->ecc.bytes == 6))

		return -ERANGE;



	if (!section) {

		oobregion->offset = 0;

		oobregion->length = 5;

	} else {

		oobregion->offset = 6;

		oobregion->length = sas - chip->ecc.bytes - 6;

	}



	return 0;

}



static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {

	.ecc = brcmnand_bch_ooblayout_ecc,

	.free = brcmnand_bch_ooblayout_free_lp,

};



static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {

	.ecc = brcmnand_bch_ooblayout_ecc,

	.free = brcmnand_bch_ooblayout_free_sp,

};



static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)

{

	struct nand_ecclayout *layout;

	struct brcmnand_cfg *p = &host->hwcfg;

	struct mtd_info *mtd = nand_to_mtd(&host->chip);

	struct nand_ecc_ctrl *ecc = &host->chip.ecc;

	unsigned int ecc_level = p->ecc_level;

	int sas = p->spare_area_size << p->sector_size_1k;

	int sectors = p->page_size / (512 << p->sector_size_1k);



	if (p->sector_size_1k)

		ecc_level <<= 1;



	layout = brcmnand_create_layout(ecc_level, host);

	if (!layout) {

	if (is_hamming_ecc(p)) {

		ecc->bytes = 3 * sectors;

		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);

		return 0;

	}



	/*

	 * CONTROLLER_VERSION:

	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)

	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)

	 * But we will just be conservative.

	 */

	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);

	if (p->page_size == 512)

		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);

	else

		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);



	if (ecc->bytes >= sas) {

		dev_err(&host->pdev->dev,

				"no proper ecc_layout for this NAND cfg\n");

		return NULL;

			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",

			ecc->bytes, sas);

		return -EINVAL;

	}



	return layout;

	return 0;

}



static void brcmnand_wp(struct mtd_info *mtd, int wp)
@@ -2010,9 +2066,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn) 
	/* only use our internal HW threshold */

	mtd->bitflip_threshold = 1;



	chip->ecc.layout = brcmstb_choose_ecc_layout(host);

	if (!chip->ecc.layout)

		return -ENXIO;

	ret = brcmstb_choose_ecc_layout(host);

	if (ret)

		return ret;



	if (nand_scan_tail(mtd))

		return -ENXIO;