drivers/mtd/nand/spi/foresee.c

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

File Facts

System
Linux kernel
Corpus path
drivers/mtd/nand/spi/foresee.c
Extension
.c
Size
4119 bytes
Lines
140
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+ OR MIT)
/*
 * Copyright (c) 2023, SberDevices. All Rights Reserved.
 *
 * Author: Martin Kurbanov <mmkurbanov@salutedevices.com>
 */

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

#define SPINAND_MFR_FORESEE		0xCD

#define F35SQB002G_STATUS_ECC_MASK		(7 << 4)
#define F35SQB002G_STATUS_ECC_NO_BITFLIPS	(0 << 4)
#define F35SQB002G_STATUS_ECC_1_3_BITFLIPS	(1 << 4)
#define F35SQB002G_STATUS_ECC_UNCOR_ERROR	(7 << 4)

static SPINAND_OP_VARIANTS(read_cache_variants,
		SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_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 f35sqa002g_ooblayout_ecc(struct mtd_info *mtd, int section,
				    struct mtd_oob_region *region)
{
	return -ERANGE;
}

static int f35sqa002g_ooblayout_free(struct mtd_info *mtd, int section,
				     struct mtd_oob_region *region)
{
	if (section)
		return -ERANGE;

	/* Reserve 2 bytes for the BBM. */
	region->offset = 2;
	region->length = 62;

	return 0;
}

static const struct mtd_ooblayout_ops f35sqa002g_ooblayout = {
	.ecc = f35sqa002g_ooblayout_ecc,
	.free = f35sqa002g_ooblayout_free,
};

static int f35sqa002g_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_HAS_BITFLIPS:
		return nanddev_get_ecc_conf(nand)->strength;

	default:
		break;
	}

	/* More than 1-bit error was detected in one or more sectors and
	 * cannot be corrected.
	 */
	return -EBADMSG;
}

static int f35sqb002g_ecc_get_status(struct spinand_device *spinand, u8 status)
{
	switch (status & F35SQB002G_STATUS_ECC_MASK) {
	case F35SQB002G_STATUS_ECC_NO_BITFLIPS:
		return 0;

	case F35SQB002G_STATUS_ECC_1_3_BITFLIPS:
		return 3;

	case F35SQB002G_STATUS_ECC_UNCOR_ERROR:
		return -EBADMSG;

	default: /* (2 << 4) through (6 << 4) are 4-8 corrected errors */

Annotation

Implementation Notes