drivers/mtd/nand/spi/fmsh.c

Source file repositories/reference/linux-study-clean/drivers/mtd/nand/spi/fmsh.c

File Facts

System
Linux kernel
Corpus path
drivers/mtd/nand/spi/fmsh.c
Extension
.c
Size
3932 bytes
Lines
147
Domain
Driver Families
Bucket
drivers/mtd
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2020-2021 Rockchip Electronics Co., Ltd.
 *
 * Author: Dingqiang Lin <jon.lin@rock-chips.com>
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>

#define FM25S01BI3_STATUS_ECC_MASK		(7 << 4)
	#define FM25S01BI3_STATUS_ECC_NO_BITFLIPS	(0 << 4)
	#define FM25S01BI3_STATUS_ECC_1_3_BITFLIPS	(1 << 4)
	#define FM25S01BI3_STATUS_ECC_UNCOR_ERROR	(2 << 4)
	#define FM25S01BI3_STATUS_ECC_4_6_BITFLIPS	(3 << 4)
	#define FM25S01BI3_STATUS_ECC_7_8_BITFLIPS	(5 << 4)

#define SPINAND_MFR_FMSH		0xA1

static SPINAND_OP_VARIANTS(read_cache_variants,
		SPINAND_PAGE_READ_FROM_CACHE_1S_4S_4S_OP(0, 2, 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));

static int fm25s01a_ooblayout_ecc(struct mtd_info *mtd, int section,
				  struct mtd_oob_region *region)
{
	return -ERANGE;
}

static int fm25s01a_ooblayout_free(struct mtd_info *mtd, int section,
				   struct mtd_oob_region *region)
{
	if (section)
		return -ERANGE;

	region->offset = 2;
	region->length = 62;

	return 0;
}

static int fm25s01bi3_ecc_get_status(struct spinand_device *spinand,
				     u8 status)
{
	switch (status & FM25S01BI3_STATUS_ECC_MASK) {
	case FM25S01BI3_STATUS_ECC_NO_BITFLIPS:
		return 0;

	case FM25S01BI3_STATUS_ECC_UNCOR_ERROR:
		return -EBADMSG;

	case FM25S01BI3_STATUS_ECC_1_3_BITFLIPS:
		return 3;

	case FM25S01BI3_STATUS_ECC_4_6_BITFLIPS:
		return 6;

	case FM25S01BI3_STATUS_ECC_7_8_BITFLIPS:
		return 8;

	default:
		break;
	}

	return -EINVAL;
}

static int fm25s01bi3_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;

Annotation

Implementation Notes