Commit a68642ad authored by Marcel Ziswiler's avatar Marcel Ziswiler Committed by Miquel Raynal
Browse files

mtd: rawnand: ESMT: retrieve ECC requirements from 5th id byte 

This patch enables support to read the ECC level from the NAND flash
using ESMT SLC NAND ID byte 5 information as documented e.g. in the
following data sheet:

https://www.esmt.com.tw/upload/pdf/ESMT/datasheets/F59L1G81LA(2Y).pdf



Signed-off-by: default avatarMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
parent 727d3782

drivers/mtd/nand/raw/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o 
nand-objs += nand_onfi.o

nand-objs += nand_jedec.o

nand-objs += nand_amd.o

nand-objs += nand_esmt.o

nand-objs += nand_hynix.o

nand-objs += nand_macronix.o

nand-objs += nand_micron.o

drivers/mtd/nand/raw/internals.h

+1 −0
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ struct nand_manufacturer { 
extern struct nand_flash_dev nand_flash_ids[];



extern const struct nand_manufacturer_ops amd_nand_manuf_ops;

extern const struct nand_manufacturer_ops esmt_nand_manuf_ops;

extern const struct nand_manufacturer_ops hynix_nand_manuf_ops;

extern const struct nand_manufacturer_ops macronix_nand_manuf_ops;

extern const struct nand_manufacturer_ops micron_nand_manuf_ops;

drivers/mtd/nand/raw/nand_esmt.c

0 → 100644
+47 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2018 Toradex AG

 *

 * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com>

 */



#include <linux/mtd/rawnand.h>

#include "internals.h"



static void esmt_nand_decode_id(struct nand_chip *chip)

{

	nand_decode_ext_id(chip);



	/* Extract ECC requirements from 5th id byte. */

	if (chip->id.len >= 5 && nand_is_slc(chip)) {

		chip->ecc_step_ds = 512;

		switch (chip->id.data[4] & 0x3) {

		case 0x0:

			chip->ecc_strength_ds = 4;

			break;

		case 0x1:

			chip->ecc_strength_ds = 2;

			break;

		case 0x2:

			chip->ecc_strength_ds = 1;

			break;

		default:

			WARN(1, "Could not get ECC info");

			chip->ecc_step_ds = 0;

			break;

		}

	}

}



static int esmt_nand_init(struct nand_chip *chip)

{

	if (nand_is_slc(chip))

		chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;



	return 0;

}



const struct nand_manufacturer_ops esmt_nand_manuf_ops = {

	.detect = esmt_nand_decode_id,

	.init = esmt_nand_init,

};

drivers/mtd/nand/raw/nand_ids.c

+1 −1
Original line number Diff line number Diff line
@@ -174,7 +174,7 @@ static const struct nand_manufacturer nand_manufacturers[] = { 
	{NAND_MFR_AMD, "AMD/Spansion", &amd_nand_manuf_ops},

	{NAND_MFR_ATO, "ATO"},

	{NAND_MFR_EON, "Eon"},

	{NAND_MFR_ESMT, "ESMT"},

	{NAND_MFR_ESMT, "ESMT", &esmt_nand_manuf_ops},

	{NAND_MFR_FUJITSU, "Fujitsu"},

	{NAND_MFR_HYNIX, "Hynix", &hynix_nand_manuf_ops},

	{NAND_MFR_INTEL, "Intel"},