mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
a68642adbb
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>
48 lines
944 B
C
48 lines
944 B
C
// 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,
|
|
};
|