mtd: spinand: Add initial support for the MX35LF1GE4AB chip (b02308af) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/mtd/nand/spi/Makefile

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		# SPDX-License-Identifier: GPL-2.0
		spinand-objs := core.o micron.o winbond.o
		spinand-objs := core.o macronix.o micron.o winbond.o
		obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/core.c

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		@@ -764,6 +764,7 @@ static const struct nand_ops spinand_ops = {
		};

		static const struct spinand_manufacturer *spinand_manufacturers[] = {
		&macronix_spinand_manufacturer,
		&micron_spinand_manufacturer,
		&winbond_spinand_manufacturer,
		};

drivers/mtd/nand/spi/macronix.c

0 → 100644

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (c) 2018 Macronix
		*
		* Author: Boris Brezillon <boris.brezillon@bootlin.com>
		*/

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

		#define SPINAND_MFR_MACRONIX 0xC2

		static SPINAND_OP_VARIANTS(read_cache_variants,
		SPINAND_PAGE_READ_FROM_CACHE_X4_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 mx35lfxge4ab_ooblayout_ecc(struct mtd_info *mtd, int section,
		struct mtd_oob_region *region)
		{
		return -ERANGE;
		}

		static int mx35lfxge4ab_ooblayout_free(struct mtd_info *mtd, int section,
		struct mtd_oob_region *region)
		{
		if (section)
		return -ERANGE;

		region->offset = 2;
		region->length = mtd->oobsize - 2;

		return 0;
		}

		static const struct mtd_ooblayout_ops mx35lfxge4ab_ooblayout = {
		.ecc = mx35lfxge4ab_ooblayout_ecc,
		.free = mx35lfxge4ab_ooblayout_free,
		};

		static int mx35lf1ge4ab_get_eccsr(struct spinand_device spinand, u8 eccsr)
		{
		struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1),
		SPI_MEM_OP_NO_ADDR,
		SPI_MEM_OP_DUMMY(1, 1),
		SPI_MEM_OP_DATA_IN(1, eccsr, 1));

		return spi_mem_exec_op(spinand->spimem, &op);
		}

		static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
		u8 status)
		{
		struct nand_device *nand = spinand_to_nand(spinand);
		u8 eccsr;

		switch (status & STATUS_ECC_MASK) {
		case STATUS_ECC_NO_BITFLIPS:
		return 0;

		case STATUS_ECC_UNCOR_ERROR:
		return -EBADMSG;

		case STATUS_ECC_HAS_BITFLIPS:
		/*
		* Let's try to retrieve the real maximum number of bitflips
		* in order to avoid forcing the wear-leveling layer to move
		* data around if it's not necessary.
		*/
		if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr))
		return nand->eccreq.strength;

		if (WARN_ON(eccsr > nand->eccreq.strength \|\| !eccsr))
		return nand->eccreq.strength;

		return eccsr;

		default:
		break;
		}

		return -EINVAL;
		}

		static const struct spinand_info macronix_spinand_table[] = {
		SPINAND_INFO("MX35LF1GE4AB", 0x12,
		NAND_MEMORG(1, 2048, 64, 64, 1024, 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(&mx35lfxge4ab_ooblayout,
		mx35lf1ge4ab_ecc_get_status)),
		};

		static int macronix_spinand_detect(struct spinand_device *spinand)
		{
		u8 *id = spinand->id.data;
		int ret;

		/*
		* Macronix SPI NAND read ID needs a dummy byte, so the first byte in
		* raw_id is garbage.
		*/
		if (id[1] != SPINAND_MFR_MACRONIX)
		return 0;

		ret = spinand_match_and_init(spinand, macronix_spinand_table,
		ARRAY_SIZE(macronix_spinand_table),
		id[2]);
		if (ret)
		return ret;

		return 1;
		}

		static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = {
		.detect = macronix_spinand_detect,
		};

		const struct spinand_manufacturer macronix_spinand_manufacturer = {
		.id = SPINAND_MFR_MACRONIX,
		.name = "Macronix",
		.ops = &macronix_spinand_manuf_ops,
		};

include/linux/mtd/spinand.h

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		@@ -194,6 +194,7 @@ struct spinand_manufacturer {
		};

		/* SPI NAND manufacturers */
		extern const struct spinand_manufacturer macronix_spinand_manufacturer;
		extern const struct spinand_manufacturer micron_spinand_manufacturer;
		extern const struct spinand_manufacturer winbond_spinand_manufacturer;