marvell/linux/drivers/mtd/nand/spi/winbond.c

// 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)

#define W25N01KW_STATUS_ECC_1_4_BITFLIPS	(1 << 4)
#define W25N01KW_STATUS_ECC_4_BITFLIPS		(3 << 4)

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 int w25n01kw_ooblayout_ecc(struct mtd_info *mtd, int section,
				  struct mtd_oob_region *region)
{
	return -ERANGE;
}

static int w25n01kw_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 w25n01kw_ooblayout = {
	.ecc = w25n01kw_ooblayout_ecc,
	.free = w25n01kw_ooblayout_free,
};

static int w25n01kw_ecc_get_status(struct spinand_device *spinand,
					u8 status)
{
	u8 status2;
	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &status2);
	int ret;

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

	case W25N01KW_STATUS_ECC_1_4_BITFLIPS:
		/*
		 * Read status2 register to determine a more fine grained
		 * bit error status
		 */
		ret = spi_mem_exec_op(spinand->spimem, &op);
		if (ret)
			return ret;

		status2 = (status2 >> 4) & 0x7;
		if (status2 == 0x7)
			return -EBADMSG;

		return status2;

	case W25N01KW_STATUS_ECC_4_BITFLIPS:
		return 4;

	case STATUS_ECC_UNCOR_ERROR:
		pr_warn("w25n01kw: exceed 4bit errors and not corrected\n");
		return -EBADMSG;

	default:
		break;
	}

	return -EINVAL;
}

static int w25n02kw_ecc_get_status(struct spinand_device *spinand,
					u8 status)
{
	u8 status2;
	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &status2);
	int ret;

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

	case W25N01KW_STATUS_ECC_1_4_BITFLIPS:
		/*
		 * Read status2 register to determine a more fine grained
		 * bit error status
		 */
		ret = spi_mem_exec_op(spinand->spimem, &op);
		if (ret)
			return ret;

		status2 = (status2 >> 4) & 0xf;
		if (status2 == 0xf)
			return -EBADMSG;

		return status2;

	case W25N01KW_STATUS_ECC_4_BITFLIPS:
		return 4;

	case STATUS_ECC_UNCOR_ERROR:
		pr_warn("w25n02kw: exceed 4bit errors and not corrected\n");
		return -EBADMSG;

	default:
		break;
	}

	return -EINVAL;
}

static const struct spinand_info winbond_spinand_table[] = {
	SPINAND_INFO("W25N01GW", 0x21BA,
		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
	SPINAND_INFO("W25N512GWxxR/T", 0x20BA,
		     NAND_MEMORG(1, 2048, 64, 64, 512, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
	SPINAND_INFO("W25N01KW", 0x21BE,
		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
		     NAND_ECCREQ(4, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25n01kw_ooblayout,
				     w25n01kw_ecc_get_status)),
	SPINAND_INFO("W25N02KW", 0x22BA,
		     NAND_MEMORG(1, 2048, 64, 64, 2048, 20, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25n01kw_ooblayout,
				     w25n02kw_ecc_get_status)),
	SPINAND_INFO("W25N02GW", 0xBB,
		     NAND_MEMORG(1, 2048, 64, 64, 2048, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
	SPINAND_INFO("W25M02GV", 0xAB,
		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 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)),
	SPINAND_INFO("W25N01GV", 0xAA,
		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
	SPINAND_INFO("W25N02JW", 0xBF,
		     NAND_MEMORG(1, 2048, 64, 64, 2048, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
	SPINAND_INFO("W25N01JW", 0x21BC,
		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
		     NAND_ECCREQ(1, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
};

/**
 * 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;
	u16 devid;
	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;

	devid = id[2] | id[3] << 8;
	ret = spinand_match_and_init(spinand, winbond_spinand_table,
				     ARRAY_SIZE(winbond_spinand_table), devid);
	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,
};