Re: [PATCH v2] mtd: spinand: add support for Foresee FS35ND01G-S1Y2

Miquel Raynal
2021-02-15T10:24:57Z

Hi Daniel,

Daniel Palmer <daniel@0x0f.com> wrote on Sat, 13 Feb 2021 18:57:24
+0900:

> Add support for the Foresee FS35ND01G-S1Y2 manufactured by Longsys.
>
> Signed-off-by: Daniel Palmer <daniel@0x0f.com>
>
> Link: https://datasheet.lcsc.com/szlcsc/2008121142_FORESEE-FS35ND01G-S1Y2QWFI000_C719495.pdf
> ---

Can you please add a changelog here when you send a new version of a
patch?

> drivers/mtd/nand/spi/Makefile | 2 +-
> drivers/mtd/nand/spi/core.c | 1 +
> drivers/mtd/nand/spi/longsys.c | 86 ++++++++++++++++++++++++++++++++++
> include/linux/mtd/spinand.h | 1 +
> 4 files changed, 89 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mtd/nand/spi/longsys.c
>
> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
> index 9662b9c1d5a9..1d6819022e43 100644
> --- a/drivers/mtd/nand/spi/Makefile
> +++ b/drivers/mtd/nand/spi/Makefile
> @@ -1,3 +1,3 @@
> # SPDX-License-Identifier: GPL-2.0
> -spinand-objs := core.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
> +spinand-objs := core.o gigadevice.o longsys.o macronix.o micron.o paragon.o toshiba.o winbond.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 61d932c1b718..8c36f0f6b1c9 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -864,6 +864,7 @@ static const struct nand_ops spinand_ops = {
>
> static const struct spinand_manufacturer *spinand_manufacturers[] = {
> &gigadevice_spinand_manufacturer,
> + &longsys_spinand_manufacturer,
> &macronix_spinand_manufacturer,
> &micron_spinand_manufacturer,
> &paragon_spinand_manufacturer,
> diff --git a/drivers/mtd/nand/spi/longsys.c b/drivers/mtd/nand/spi/longsys.c
> new file mode 100644
> index 000000000000..418bd5a1f20d
> --- /dev/null
> +++ b/drivers/mtd/nand/spi/longsys.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020 Daniel Palmer <daniel@thingy.jp>
> + *
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mtd/spinand.h>
> +
> +#define SPINAND_MFR_LONGSYS 0xCD
> +
> +static SPINAND_OP_VARIANTS(read_cache_variants,
> + 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(true, 0, NULL, 0));
> +
> +static SPINAND_OP_VARIANTS(update_cache_variants,
> + SPINAND_PROG_LOAD(false, 0, NULL, 0));
> +
> +static int fs35nd01g_s1y2_ooblayout_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *region)
> +{
> + if (section > 3)
> + return -ERANGE;
> +
> + /* ECC is not user accessible */
> + region->offset = 0;
> + region->length = 0;
> +
> + return 0;
> +}
> +
> +static int fs35nd01g_s1y2_ooblayout_free(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *region)
> +{
> + if (section > 3)
> + return -ERANGE;
> +
> + /*
> + * No ECC data is stored in the accessible OOB so the full 16 bytes
> + * of each spare region is available to the user. Apparently also
> + * covered by the internal ECC.

How is this even possible? ECC must be stored somewhere, maybe it is
not possible to retrieve it but I guess you cannot use the 32 bytes of
OOB for user data. Can you please verify that?

> + */
> + if (section) {
> + region->offset = 16 * section;
> + region->length = 16;
> + } else {
> + /* First byte in spare0 area is used for bad block marker */
> + region->offset = 1;
> + region->length = 15;
> + }
> +
> + return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops fs35nd01g_s1y2_ooblayout = {
> + .ecc = fs35nd01g_s1y2_ooblayout_ecc,
> + .free = fs35nd01g_s1y2_ooblayout_free,
> +};
> +
> +static const struct spinand_info longsys_spinand_table[] = {
> + SPINAND_INFO("FS35ND01G-S1Y2",
> + SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xEA, 0x11),
> + 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),
> + SPINAND_HAS_QE_BIT,
> + SPINAND_ECCINFO(&fs35nd01g_s1y2_ooblayout,
> + NULL)),
> +};
> +
> +static const struct spinand_manufacturer_ops longsys_spinand_manuf_ops = {
> +};
> +
> +const struct spinand_manufacturer longsys_spinand_manufacturer = {
> + .id = SPINAND_MFR_LONGSYS,
> + .name = "Longsys",
> + .chips = longsys_spinand_table,
> + .nchips = ARRAY_SIZE(longsys_spinand_table),
> + .ops = &longsys_spinand_manuf_ops,
> +};
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index 6bb92f26833e..8651e63a2f8a 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -239,6 +239,7 @@ struct spinand_manufacturer {
>
> /* SPI NAND manufacturers */
> extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
> +extern const struct spinand_manufacturer longsys_spinand_manufacturer;
> extern const struct spinand_manufacturer macronix_spinand_manufacturer;
> extern const struct spinand_manufacturer micron_spinand_manufacturer;
> extern const struct spinand_manufacturer paragon_spinand_manufacturer;

Thanks,
Miquèl