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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: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Marcel Ziswiler 2018-09-19 13:40:49 +02:00 committed by Miquel Raynal
parent 727d37826b
commit a68642adbb
4 changed files with 50 additions and 1 deletions
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1
drivers/mtd/nand/raw/Makefile
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@ -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

1
drivers/mtd/nand/raw/internals.h
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@ -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;

47
drivers/mtd/nand/raw/nand_esmt.c Normal file
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@ -0,0 +1,47 @@
// 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,
};

2
drivers/mtd/nand/raw/nand_ids.c
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@ -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"},