diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-09-19 13:40:49 +0200 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2018-10-03 11:12:25 +0200 |
| commit | a68642adbb1a80d1a70a472d01a8a32aaa1a96c4 (patch) | |
| tree | 325210737a00faefab24074c9999470fde035a75 /drivers/mtd | |
| parent | 727d37826bd19905424d6f5cf8351fcb4be71206 (diff) | |
| download | linux-a68642adbb1a80d1a70a472d01a8a32aaa1a96c4.tar.bz2 | |
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>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/raw/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/internals.h | 1 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/nand_esmt.c | 47 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/nand_ids.c | 2 |
4 files changed, 50 insertions, 1 deletions
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile index be2c17863ee5..57159b349054 100644 --- a/drivers/mtd/nand/raw/Makefile +++ b/drivers/mtd/nand/raw/Makefile @@ -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 diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h index f624b7b80413..04c2cf74eff3 100644 --- a/drivers/mtd/nand/raw/internals.h +++ b/drivers/mtd/nand/raw/internals.h @@ -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; diff --git a/drivers/mtd/nand/raw/nand_esmt.c b/drivers/mtd/nand/raw/nand_esmt.c new file mode 100644 index 000000000000..96f039a83bc8 --- /dev/null +++ b/drivers/mtd/nand/raw/nand_esmt.c @@ -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, +}; diff --git a/drivers/mtd/nand/raw/nand_ids.c b/drivers/mtd/nand/raw/nand_ids.c index fd0a7f711100..ea5a342cd91e 100644 --- a/drivers/mtd/nand/raw/nand_ids.c +++ b/drivers/mtd/nand/raw/nand_ids.c @@ -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"}, |