mtd: spinand: Add initial support for Winbond W25M02GV (1075492b) · 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
		spinand-objs := core.o micron.o winbond.o
		obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/core.c

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		@@ -765,6 +765,7 @@ static const struct nand_ops spinand_ops = {

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

		static int spinand_manufacturer_detect(struct spinand_device *spinand)

drivers/mtd/nand/spi/winbond.c

0 → 100644

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (c) 2017 exceet electronics GmbH
		*
		* Authors:
		* Frieder Schrempf <frieder.schrempf@exceet.de>
		* Boris Brezillon <boris.brezillon@bootlin.com>
		*/

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

		#define SPINAND_MFR_WINBOND 0xEF

		#define WINBOND_CFG_BUF_READ BIT(3)

		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 w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section,
		struct mtd_oob_region *region)
		{
		if (section > 3)
		return -ERANGE;

		region->offset = (16 * section) + 8;
		region->length = 8;

		return 0;
		}

		static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section,
		struct mtd_oob_region *region)
		{
		if (section > 3)
		return -ERANGE;

		region->offset = (16 * section) + 2;
		region->length = 6;

		return 0;
		}

		static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
		.ecc = w25m02gv_ooblayout_ecc,
		.free = w25m02gv_ooblayout_free,
		};

		static int w25m02gv_select_target(struct spinand_device *spinand,
		unsigned int target)
		{
		struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
		SPI_MEM_OP_NO_ADDR,
		SPI_MEM_OP_NO_DUMMY,
		SPI_MEM_OP_DATA_OUT(1,
		spinand->scratchbuf,
		1));

		*spinand->scratchbuf = target;
		return spi_mem_exec_op(spinand->spimem, &op);
		}

		static const struct spinand_info winbond_spinand_table[] = {
		SPINAND_INFO("W25M02GV", 0xAB,
		NAND_MEMORG(1, 2048, 64, 64, 1024, 1, 1, 2),
		NAND_ECCREQ(1, 512),
		SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
		&write_cache_variants,
		&update_cache_variants),
		0,
		SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
		SPINAND_SELECT_TARGET(w25m02gv_select_target)),
		};

		/**
		* winbond_spinand_detect - initialize device related part in spinand_device
		* struct if it is a Winbond device.
		* @spinand: SPI NAND device structure
		*/
		static int winbond_spinand_detect(struct spinand_device *spinand)
		{
		u8 *id = spinand->id.data;
		int ret;

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

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

		return 1;
		}

		static int winbond_spinand_init(struct spinand_device *spinand)
		{
		struct nand_device *nand = spinand_to_nand(spinand);
		unsigned int i;

		/*
		* Make sure all dies are in buffer read mode and not continuous read
		* mode.
		*/
		for (i = 0; i < nand->memorg.ntargets; i++) {
		spinand_select_target(spinand, i);
		spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
		WINBOND_CFG_BUF_READ);
		}

		return 0;
		}

		static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
		.detect = winbond_spinand_detect,
		.init = winbond_spinand_init,
		};

		const struct spinand_manufacturer winbond_spinand_manufacturer = {
		.id = SPINAND_MFR_WINBOND,
		.name = "Winbond",
		.ops = &winbond_spinand_manuf_ops,
		};

include/linux/mtd/spinand.h

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		@@ -195,6 +195,7 @@ struct spinand_manufacturer {

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

		/**
		* struct spinand_op_variants - SPI NAND operation variants