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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2017 Micron Technology, Inc.
*
* Authors:
* Peter Pan <peterpandong@micron.com>
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
#define SPINAND_MFR_MICRON 0x2c
#define MICRON_STATUS_ECC_MASK GENMASK(7, 4)
#define MICRON_STATUS_ECC_NO_BITFLIPS (0 << 4)
#define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4)
#define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4)
#define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4)
static SPINAND_OP_VARIANTS(read_cache_variants,
SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
static SPINAND_OP_VARIANTS(write_cache_variants,
SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
SPINAND_PROG_LOAD(true, 0, NULL, 0));
static SPINAND_OP_VARIANTS(update_cache_variants,
SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
SPINAND_PROG_LOAD(false, 0, NULL, 0));
static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section)
return -ERANGE;
region->offset = 64;
region->length = 64;
return 0;
}
static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section)
return -ERANGE;
/* Reserve 2 bytes for the BBM. */
region->offset = 2;
region->length = 62;
return 0;
}
static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
.ecc = mt29f2g01abagd_ooblayout_ecc,
.free = mt29f2g01abagd_ooblayout_free,
};
static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
u8 status)
{
switch (status & MICRON_STATUS_ECC_MASK) {
case STATUS_ECC_NO_BITFLIPS:
return 0;
case STATUS_ECC_UNCOR_ERROR:
return -EBADMSG;
case MICRON_STATUS_ECC_1TO3_BITFLIPS:
return 3;
case MICRON_STATUS_ECC_4TO6_BITFLIPS:
return 6;
case MICRON_STATUS_ECC_7TO8_BITFLIPS:
return 8;
default:
break;
}
return -EINVAL;
}
static const struct spinand_info micron_spinand_table[] = {
SPINAND_INFO("MT29F2G01ABAGD", 0x24,
NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 2, 1, 1),
NAND_ECCREQ(8, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
0,
SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
mt29f2g01abagd_ecc_get_status)),
};
static int micron_spinand_detect(struct spinand_device *spinand)
{
u8 *id = spinand->id.data;
int ret;
/*
* Micron SPI NAND read ID need a dummy byte,
* so the first byte in raw_id is dummy.
*/
if (id[1] != SPINAND_MFR_MICRON)
return 0;
ret = spinand_match_and_init(spinand, micron_spinand_table,
ARRAY_SIZE(micron_spinand_table), id[2]);
if (ret)
return ret;
return 1;
}
static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
.detect = micron_spinand_detect,
};
const struct spinand_manufacturer micron_spinand_manufacturer = {
.id = SPINAND_MFR_MICRON,
.name = "Micron",
.ops = µn_spinand_manuf_ops,
};
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