// SPDX-License-Identifier: GPL-2.0
/*
* Author: Mario Kicherer <dev@kicherer.org>
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
#define SPINAND_MFR_ALLIANCEMEMORY 0x52
#define AM_STATUS_ECC_BITMASK (3 << 4)
#define AM_STATUS_ECC_NONE_DETECTED (0 << 4)
#define AM_STATUS_ECC_CORRECTED (1 << 4)
#define AM_STATUS_ECC_ERRORED (2 << 4)
#define AM_STATUS_ECC_MAX_CORRECTED (3 << 4)
static SPINAND_OP_VARIANTS(read_cache_variants,
SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, 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 am_get_eccsize(struct mtd_info *mtd)
{
if (mtd->oobsize == 64)
return 0x20;
else if (mtd->oobsize == 128)
return 0x38;
else if (mtd->oobsize == 256)
return 0x70;
else
return -EINVAL;
}
static int am_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
int ecc_bytes;
ecc_bytes = am_get_eccsize(mtd);
if (ecc_bytes < 0)
return ecc_bytes;
region->offset = mtd->oobsize - ecc_bytes;
region->length = ecc_bytes;
return 0;
}
static int am_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
int ecc_bytes;
if (section)
return -ERANGE;
ecc_bytes = am_get_eccsize(mtd);
if (ecc_bytes < 0)
return ecc_bytes;
/*
* It is unclear how many bytes are used for the bad block marker. We
* reserve the common two bytes here.
*
* The free area in this kind of flash is divided into chunks where the
* first 4 bytes of each chunk are unprotected. The number of chunks
* depends on the specific model. The models with 4096+256 bytes pages
* have 8 chunks, the others 4 chunks.
*/
region->offset = 2;
region->length = mtd->oobsize - 2 - ecc_bytes;
return 0;
}
static const struct mtd_ooblayout_ops am_ooblayout = {
.ecc = am_ooblayout_ecc,
.free = am_ooblayout_free,
};
static int am_ecc_get_status(struct spinand_device *spinand, u8 status)
{
switch (status & AM_STATUS_ECC_BITMASK) {
case AM_STATUS_ECC_NONE_DETECTED:
return 0;
case AM_STATUS_ECC_CORRECTED:
/*
* use oobsize to determine the flash model and the maximum of
* correctable errors and return maximum - 1 by convention
*/
if (spinand->base.mtd.oobsize == 64)
return 3;
else
return 7;
case AM_STATUS_ECC_ERRORED:
return -EBADMSG;
case AM_STATUS_ECC_MAX_CORRECTED:
/*
* use oobsize to determine the flash model and the maximum of
* correctable errors
*/
if (spinand->base.mtd.oobsize == 64)
return 4;
else
return 8;
default:
break;
}
return -EINVAL;
}
static const struct spinand_info alliancememory_spinand_table[] = {
SPINAND_INFO("AS5F34G04SND",
SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x2f),
NAND_MEMORG(1, 2048, 128, 64, 4096, 80, 1, 1, 1),
NAND_ECCREQ(4, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
SPINAND_HAS_QE_BIT,
SPINAND_ECCINFO(&am_ooblayout,
am_ecc_get_status)),
};
static const struct spinand_manufacturer_ops alliancememory_spinand_manuf_ops = {
};
const struct spinand_manufacturer alliancememory_spinand_manufacturer = {
.id = SPINAND_MFR_ALLIANCEMEMORY,
.name = "AllianceMemory",
.chips = alliancememory_spinand_table,
.nchips = ARRAY_SIZE(alliancememory_spinand_table),
.ops = &alliancememory_spinand_manuf_ops,
};
