Re: [PATCH v1] mtd: spinand: add support for FORESEE F35SQA002G

Miquel Raynal
2023-10-02T09:45:18Z

Hi Martin,

mmkurbanov@salutedevices.com wrote on Fri, 29 Sep 2023 17:49:34 +0300:

> Add support for FORESEE F35SQA002G SPI NAND.
> Datasheet:
> https://www.longsys.com/uploads/LM-00006FORESEEF35SQA002GDatasheet_1650183701.pdf
>
> Signed-off-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
> ---
> drivers/mtd/nand/spi/Makefile | 2 +-
> drivers/mtd/nand/spi/core.c | 1 +
> drivers/mtd/nand/spi/foresee.c | 101 +++++++++++++++++++++++++++++++++
> include/linux/mtd/spinand.h | 1 +
> 4 files changed, 104 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mtd/nand/spi/foresee.c
>
> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
> index cd8b66bf7740..19cc77288ebb 100644
> --- a/drivers/mtd/nand/spi/Makefile
> +++ b/drivers/mtd/nand/spi/Makefile
> @@ -1,4 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
> -spinand-objs := core.o alliancememory.o ato.o esmt.o gigadevice.o macronix.o
> +spinand-objs := core.o alliancememory.o ato.o esmt.o foresee.o gigadevice.o macronix.o
> spinand-objs += micron.o paragon.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 393ff37f0d23..849ccfedbc72 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -940,6 +940,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
> &alliancememory_spinand_manufacturer,
> &ato_spinand_manufacturer,
> &esmt_c8_spinand_manufacturer,
> + &foresee_spinand_manufacturer,
> &gigadevice_spinand_manufacturer,
> &macronix_spinand_manufacturer,
> &micron_spinand_manufacturer,
> diff --git a/drivers/mtd/nand/spi/foresee.c b/drivers/mtd/nand/spi/foresee.c
> new file mode 100644
> index 000000000000..55d4ff1f091a
> --- /dev/null
> +++ b/drivers/mtd/nand/spi/foresee.c
> @@ -0,0 +1,101 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2023, SberDevices. All Rights Reserved.
> + *
> + * Author: Martin Kurbanov <mmkurbanov@salutedevices.com>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mtd/spinand.h>
> +
> +#define SPINAND_MFR_FORESEE 0xCD
> +
> +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 f35sqa002g_ooblayout_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *region)
> +{
> + return -ERANGE;
> +}
> +
> +static int f35sqa002g_ooblayout_free(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *region)
> +{
> + /* XXX: It is not possible to partially write to this OOB area, as both
> + * the main and OOB areas are protected by ECC. The user needs to
> + * program both the main area and OOB area at one programming time,
> + * so that the ECC parity code can be calculated properly.
> + */

Is this comment really needed? I believe it could be dropped, unless
you are really experiencing strange subpage write attempts?

> +
> + if (section)
> + return -ERANGE;
> +
> + /* Reserve 2 bytes for the BBM. */
> + region->offset = 2;
> + region->length = 62;
> +
> + return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops f35sqa002g_ooblayout = {
> + .ecc = f35sqa002g_ooblayout_ecc,
> + .free = f35sqa002g_ooblayout_free,
> +};
> +
> +static int f35sqa002g_ecc_get_status(struct spinand_device *spinand, u8 status)
> +{
> + struct nand_device *nand = spinand_to_nand(spinand);
> +
> + switch (status & STATUS_ECC_MASK) {
> + case STATUS_ECC_NO_BITFLIPS:
> + return 0;
> +
> + case STATUS_ECC_HAS_BITFLIPS:
> + return nanddev_get_ecc_conf(nand)->strength;
> +
> + default:
> + break;
> + }
> +
> + /* More than 1-bit error was detected in one or more sectors and
> + * cannot be corrected.
> + */
> + return -EBADMSG;
> +}
> +
> +static const struct spinand_info foresee_spinand_table[] = {
> + SPINAND_INFO("F35SQA002G",
> + SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x72, 0x72),
> + NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 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(&f35sqa002g_ooblayout,
> + f35sqa002g_ecc_get_status)),
> +};
> +
> +static const struct spinand_manufacturer_ops foresee_spinand_manuf_ops = {
> +};
> +
> +const struct spinand_manufacturer foresee_spinand_manufacturer = {
> + .id = SPINAND_MFR_FORESEE,
> + .name = "FORESEE",
> + .chips = foresee_spinand_table,
> + .nchips = ARRAY_SIZE(foresee_spinand_table),
> + .ops = &foresee_spinand_manuf_ops,
> +};
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index 3e285c09d16d..badb4c1ac079 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -263,6 +263,7 @@ 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 foresee_spinand_manufacturer;
> extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
> extern const struct spinand_manufacturer macronix_spinand_manufacturer;
> extern const struct spinand_manufacturer micron_spinand_manufacturer;

Otherwise looks good.

Thanks,
Miquèl