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// SPDX-License-Identifier: GPL-2.0
/*
* Authors:
* Andrey Zolotarev <andrey.zolotarev@keenetic.com> - the main driver logic
* Aleksei Sviridkin <f@lex.la> - adaptation to the mainline Linux kernel
*
* Based on:
* https://github.com/keenetic/kernel-49/commit/bacade569fb12bc0ad31ba09bca9b890118fbca7
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
#define SPINAND_MFR_HEYANGTEK 0xc9
#define HYF1GQ4_STATUS_ECC_LIMIT_BITFLIPS (3 << 4)
static SPINAND_OP_VARIANTS(read_cache_variants,
SPINAND_PAGE_READ_FROM_CACHE_1S_4S_4S_OP(0, 1, NULL, 0, 0),
SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_OP(0, 1, NULL, 0, 0),
SPINAND_PAGE_READ_FROM_CACHE_1S_2S_2S_OP(0, 1, NULL, 0, 0),
SPINAND_PAGE_READ_FROM_CACHE_1S_1S_2S_OP(0, 1, NULL, 0, 0),
SPINAND_PAGE_READ_FROM_CACHE_FAST_1S_1S_1S_OP(0, 1, NULL, 0, 0),
SPINAND_PAGE_READ_FROM_CACHE_1S_1S_1S_OP(0, 1, NULL, 0, 0));
static SPINAND_OP_VARIANTS(write_cache_variants,
SPINAND_PROG_LOAD_1S_1S_4S_OP(true, 0, NULL, 0),
SPINAND_PROG_LOAD_1S_1S_1S_OP(true, 0, NULL, 0));
static SPINAND_OP_VARIANTS(update_cache_variants,
SPINAND_PROG_LOAD_1S_1S_4S_OP(false, 0, NULL, 0),
SPINAND_PROG_LOAD_1S_1S_1S_OP(false, 0, NULL, 0));
/*
* HYF1GQ4UDACAE is a GD5F1GQ4-compatible die, so the OOB layout is taken
* from gd5fxgq4xa: the on-die ECC parity occupies bytes 8..15 of each
* 16-byte section, the bad block marker sits in byte 0 and the remaining
* bytes are exposed as free.
*/
static int hyf1gq4_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section > 3)
return -ERANGE;
region->offset = (16 * section) + 8;
region->length = 8;
return 0;
}
static int hyf1gq4_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section > 3)
return -ERANGE;
if (section) {
region->offset = 16 * section;
region->length = 8;
} else {
/* section 0 has one byte reserved for the bad block marker */
region->offset = 1;
region->length = 7;
}
return 0;
}
static const struct mtd_ooblayout_ops hyf1gq4_ooblayout = {
.ecc = hyf1gq4_ooblayout_ecc,
.free = hyf1gq4_ooblayout_free,
};
static int hyf1gq4_ecc_get_status(struct spinand_device *spinand, u8 status)
{
struct nand_device *nand = spinand_to_nand(spinand);
switch (status & STATUS_ECC_MASK) {
case STATUS_ECC_NO_BITFLIPS:
return 0;
case STATUS_ECC_UNCOR_ERROR:
return -EBADMSG;
case STATUS_ECC_HAS_BITFLIPS:
/*
* The die exposes only a coarse 2-bit ECC status and has no
* register for the exact bitflip count. This code means
* "corrected, below the refresh threshold", so report half of
* the ECC strength as a representative value.
*/
return nanddev_get_ecc_conf(nand)->strength / 2;
case HYF1GQ4_STATUS_ECC_LIMIT_BITFLIPS:
/*
* "Corrected, refresh recommended": report the full ECC
* strength so the upper layers relocate the data.
*/
return nanddev_get_ecc_conf(nand)->strength;
default:
break;
}
return -EINVAL;
}
static const struct spinand_info heyangtek_spinand_table[] = {
SPINAND_INFO("HYF1GQ4UDACAE",
SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x21),
NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 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(&hyf1gq4_ooblayout,
hyf1gq4_ecc_get_status)),
};
static const struct spinand_manufacturer_ops heyangtek_spinand_manuf_ops = {
};
const struct spinand_manufacturer heyangtek_spinand_manufacturer = {
.id = SPINAND_MFR_HEYANGTEK,
.name = "HeYangTek",
.chips = heyangtek_spinand_table,
.nchips = ARRAY_SIZE(heyangtek_spinand_table),
.ops = &heyangtek_spinand_manuf_ops,
};
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