[PATCH v2] mtd: spinand: add support for FudanMicro FM25S01A

[Mikhail Kshevetskiy]

Reviewed-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>


On 11/1/25 08:19, Tianling Shen wrote:
> Add support for FudanMicro FM25S01A SPI NAND.
>
> This driver is ported from linux v6.18 and tested on a MT7981 board.
>
> Link: https://lore.kernel.org/linux-mtd/20250824170013.3328777-1-cnsztl@gmail.com/
> Signed-off-by: Tianling Shen <cnsztl at gmail.com>
> ---
>
> Changes in v2:
> - add fmsh manufacturer to core files
>
> ---
>  drivers/mtd/nand/spi/Makefile |  2 +-
>  drivers/mtd/nand/spi/core.c   |  1 +
>  drivers/mtd/nand/spi/fmsh.c   | 76 +++++++++++++++++++++++++++++++++++
>  include/linux/mtd/spinand.h   |  1 +
>  4 files changed, 79 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/mtd/nand/spi/fmsh.c
>
> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
> index 152aa1a3783c..a7a0b2cb4b9e 100644
> --- a/drivers/mtd/nand/spi/Makefile
> +++ b/drivers/mtd/nand/spi/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
>  spinand-objs := core.o otp.o
> -spinand-objs += alliancememory.o ato.o esmt.o foresee.o gigadevice.o macronix.o
> +spinand-objs += alliancememory.o ato.o esmt.o fmsh.o foresee.o gigadevice.o macronix.o
>  spinand-objs += micron.o paragon.o skyhigh.o toshiba.o winbond.o xtx.o
>  obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 0c4350595469..14af42646122 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -1227,6 +1227,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
>  	&alliancememory_spinand_manufacturer,
>  	&ato_spinand_manufacturer,
>  	&esmt_c8_spinand_manufacturer,
> +	&fmsh_spinand_manufacturer,
>  	&foresee_spinand_manufacturer,
>  	&gigadevice_spinand_manufacturer,
>  	&macronix_spinand_manufacturer,
> diff --git a/drivers/mtd/nand/spi/fmsh.c b/drivers/mtd/nand/spi/fmsh.c
> new file mode 100644
> index 000000000000..84a567919ebb
> --- /dev/null
> +++ b/drivers/mtd/nand/spi/fmsh.c
> @@ -0,0 +1,76 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020-2021 Rockchip Electronics Co., Ltd.
> + *
> + * Author: Dingqiang Lin <jon.lin at rock-chips.com>
> + */
> +
> +#ifndef __UBOOT__
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#endif
> +#include <linux/mtd/spinand.h>
> +
> +#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 const struct mtd_ooblayout_ops fm25s01a_ooblayout = {
> +	.ecc = fm25s01a_ooblayout_ecc,
> +	.rfree = fm25s01a_ooblayout_free,
> +};
> +
> +static const struct spinand_info fmsh_spinand_table[] = {
> +	SPINAND_INFO("FM25S01A",
> +		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xE4),
> +		     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),
> +		     SPINAND_HAS_QE_BIT,
> +		     SPINAND_ECCINFO(&fm25s01a_ooblayout, NULL)),
> +};
> +
> +static const struct spinand_manufacturer_ops fmsh_spinand_manuf_ops = {
> +};
> +
> +const struct spinand_manufacturer fmsh_spinand_manufacturer = {
> +	.id = SPINAND_MFR_FMSH,
> +	.name = "Fudan Micro",
> +	.chips = fmsh_spinand_table,
> +	.nchips = ARRAY_SIZE(fmsh_spinand_table),
> +	.ops = &fmsh_spinand_manuf_ops,
> +};
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index cf9b9656d054..e9561c0a3956 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -361,6 +361,7 @@ struct spinand_manufacturer {
>  extern const struct spinand_manufacturer alliancememory_spinand_manufacturer;
>  extern const struct spinand_manufacturer ato_spinand_manufacturer;
>  extern const struct spinand_manufacturer esmt_c8_spinand_manufacturer;
> +extern const struct spinand_manufacturer fmsh_spinand_manufacturer;
>  extern const struct spinand_manufacturer foresee_spinand_manufacturer;
>  extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
>  extern const struct spinand_manufacturer macronix_spinand_manufacturer;