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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Jeff Kletsky
*
* Author: Jeff Kletsky <git-commits@allycomm.com>
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
#define SPINAND_MFR_PARAGON 0xa1
#define PN26G0XA_STATUS_ECC_BITMASK (3 << 4)
#define PN26G0XA_STATUS_ECC_NONE_DETECTED (0 << 4)
#define PN26G0XA_STATUS_ECC_1_7_CORRECTED (1 << 4)
#define PN26G0XA_STATUS_ECC_ERRORED (2 << 4)
#define PN26G0XA_STATUS_ECC_8_CORRECTED (3 << 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 pn26g0xa_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section > 3)
return -ERANGE;
region->offset = 6 + (15 * section); /* 4 BBM + 2 user bytes */
region->length = 13;
return 0;
}
static int pn26g0xa_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section > 4)
return -ERANGE;
if (section == 4) {
region->offset = 64;
region->length = 64;
} else {
region->offset = 4 + (15 * section);
region->length = 2;
}
return 0;
}
static int pn26g0xa_ecc_get_status(struct spinand_device *spinand,
u8 status)
{
switch (status & PN26G0XA_STATUS_ECC_BITMASK) {
case PN26G0XA_STATUS_ECC_NONE_DETECTED:
return 0;
case PN26G0XA_STATUS_ECC_1_7_CORRECTED:
return 7; /* Return upper limit by convention */
case PN26G0XA_STATUS_ECC_8_CORRECTED:
return 8;
case PN26G0XA_STATUS_ECC_ERRORED:
return -EBADMSG;
default:
break;
}
return -EINVAL;
}
static const struct mtd_ooblayout_ops pn26g0xa_ooblayout = {
.ecc = pn26g0xa_ooblayout_ecc,
.free = pn26g0xa_ooblayout_free,
};
static const struct spinand_info paragon_spinand_table[] = {
SPINAND_INFO("PN26G01A", 0xe1,
NAND_MEMORG(1, 2048, 128, 64, 1024, 21, 1, 1, 1),
NAND_ECCREQ(8, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
0,
SPINAND_ECCINFO(&pn26g0xa_ooblayout,
pn26g0xa_ecc_get_status)),
SPINAND_INFO("PN26G02A", 0xe2,
NAND_MEMORG(1, 2048, 128, 64, 2048, 41, 1, 1, 1),
NAND_ECCREQ(8, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
0,
SPINAND_ECCINFO(&pn26g0xa_ooblayout,
pn26g0xa_ecc_get_status)),
};
static int paragon_spinand_detect(struct spinand_device *spinand)
{
u8 *id = spinand->id.data;
int ret;
/* Read ID returns [0][MID][DID] */
if (id[1] != SPINAND_MFR_PARAGON)
return 0;
ret = spinand_match_and_init(spinand, paragon_spinand_table,
ARRAY_SIZE(paragon_spinand_table),
id[2]);
if (ret)
return ret;
return 1;
}
static const struct spinand_manufacturer_ops paragon_spinand_manuf_ops = {
.detect = paragon_spinand_detect,
};
const struct spinand_manufacturer paragon_spinand_manufacturer = {
.id = SPINAND_MFR_PARAGON,
.name = "Paragon",
.ops = ¶gon_spinand_manuf_ops,
};
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