55 lines
1.2 KiB
C
55 lines
1.2 KiB
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->base.eccreq.step_size = 512;
|
|
switch (chip->id.data[4] & 0x3) {
|
|
case 0x0:
|
|
chip->base.eccreq.strength = 4;
|
|
break;
|
|
case 0x1:
|
|
chip->base.eccreq.strength = 2;
|
|
break;
|
|
case 0x2:
|
|
chip->base.eccreq.strength = 1;
|
|
break;
|
|
default:
|
|
WARN(1, "Could not get ECC info");
|
|
chip->base.eccreq.step_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int esmt_nand_init(struct nand_chip *chip)
|
|
{
|
|
if (nand_is_slc(chip))
|
|
/*
|
|
* It is known that some ESMT SLC NANDs have been shipped
|
|
* with the factory bad block markers in the first or last page
|
|
* of the block, instead of the first or second page. To be on
|
|
* the safe side, let's check all three locations.
|
|
*/
|
|
chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
|
|
NAND_BBM_LASTPAGE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct nand_manufacturer_ops esmt_nand_manuf_ops = {
|
|
.detect = esmt_nand_decode_id,
|
|
.init = esmt_nand_init,
|
|
};
|