111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 Jeff Kletsky
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*
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* Author: Jeff Kletsky <[email protected]>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mtd/spinand.h>
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#define SPINAND_MFR_DOSILICON 0xe5
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#define DOSILICON_STATUS_ECC_MASK GENMASK(6, 4)
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#define DOSILICON_STATUS_ECC_NO_BITFLIPS (0 << 4)
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#define DOSILICON_STATUS_ECC_1_3_BITFLIPS (1 << 4)
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#define DOSILICON_STATUS_ECC_UNCOR_ERROR (2 << 4)
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#define DOSILICON_STATUS_ECC_4_6_BITFLIPS (3 << 4)
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#define DOSILICON_STATUS_ECC_7_8_BITFLIPS (5 << 4)
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static SPINAND_OP_VARIANTS(read_cache_variants,
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//SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
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//SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
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static SPINAND_OP_VARIANTS(write_cache_variants,
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SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
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SPINAND_PROG_LOAD(true, 0, NULL, 0));
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static SPINAND_OP_VARIANTS(update_cache_variants,
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SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
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SPINAND_PROG_LOAD(false, 0, NULL, 0));
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static int ds35q2gb_ooblayout_ecc(struct mtd_info *mtd, int section,
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struct mtd_oob_region *region)
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{
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/* Unable to know the layout of ECC */
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return -ERANGE;
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}
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static int ds35q2gb_ooblayout_free(struct mtd_info *mtd, int section,
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struct mtd_oob_region *region)
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{
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if (section)
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return -ERANGE;
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/* Reserve 2 bytes for the BBM. */
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region->offset = 2;
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region->length = 62;
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return 0;
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}
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static const struct mtd_ooblayout_ops ds35q2gb_ooblayout = {
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.ecc = ds35q2gb_ooblayout_ecc,
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.free = ds35q2gb_ooblayout_free,
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};
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static int ds35q2gb_ecc_get_status(struct spinand_device *spinand,
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u8 status)
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{
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switch (status & DOSILICON_STATUS_ECC_MASK) {
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case DOSILICON_STATUS_ECC_NO_BITFLIPS:
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return 0;
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/*
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* We have no way to know exactly how many bitflips have been
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* fixed, so let's return the maximum possible value so that
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* wear-leveling layers move the data immediately.
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*/
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case DOSILICON_STATUS_ECC_1_3_BITFLIPS:
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return 3;
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case DOSILICON_STATUS_ECC_4_6_BITFLIPS:
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return 6;
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case DOSILICON_STATUS_ECC_7_8_BITFLIPS:
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return 8;
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case DOSILICON_STATUS_ECC_UNCOR_ERROR:
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return -EBADMSG;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct spinand_info dosilicon_spinand_table[] = {
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SPINAND_INFO("DS35Q2GB-IBR 3.3v",
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SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xf2),
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NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 2, 1, 1),
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NAND_ECCREQ(8, 512),
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SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
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&write_cache_variants,
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&update_cache_variants),
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SPINAND_HAS_QE_BIT,
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SPINAND_ECCINFO(&ds35q2gb_ooblayout,
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ds35q2gb_ecc_get_status)),
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};
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static const struct spinand_manufacturer_ops dosilicon_spinand_manuf_ops = {
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};
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const struct spinand_manufacturer dosilicon_spinand_manufacturer = {
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.id = SPINAND_MFR_DOSILICON,
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.name = "dosilicon",
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.chips = dosilicon_spinand_table,
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.nchips = ARRAY_SIZE(dosilicon_spinand_table),
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.ops = &dosilicon_spinand_manuf_ops,
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};
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