Re: [V2] mtd: spinand: Add support for Etron EM73D044VCx

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Bert,

Bert Vermeulen <bert@biot.com> wrote on Thu, 29 Jul 2021 17:18:23 +0200:

> This adds a new vendor Etron, and support for a 2Gb chip.

Interesting name :)

> The datasheet is available at
> https://www.etron.com/cn/products/EM73%5B8%5DC%5BD_E_F%5DVC%20SPI%20NAND%20Flash_Promotion_Rev%201_00A.pdf
> 
> Signed-off-by: Bert Vermeulen <bert@biot.com>
> ---
> v2: Fixed a small style issue, and now sending to linux-mtd@ as well.
> 
>  drivers/mtd/nand/spi/Makefile |  2 +-
>  drivers/mtd/nand/spi/core.c   |  1 +
>  drivers/mtd/nand/spi/etron.c  | 98 +++++++++++++++++++++++++++++++++++
>  include/linux/mtd/spinand.h   |  1 +
>  4 files changed, 101 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/mtd/nand/spi/etron.c
> 
> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
> index 9662b9c1d5a9..cc3c4e046ea9 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 etron.o gigadevice.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 446ba8d43fbc..2a806ffa7310 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -895,6 +895,7 @@ static const struct nand_ops spinand_ops = {
>  
>  static const struct spinand_manufacturer *spinand_manufacturers[] = {
>  	&gigadevice_spinand_manufacturer,
> +	&etron_spinand_manufacturer,

Should be placed above :)

>  	&macronix_spinand_manufacturer,
>  	&micron_spinand_manufacturer,
>  	&paragon_spinand_manufacturer,
> diff --git a/drivers/mtd/nand/spi/etron.c b/drivers/mtd/nand/spi/etron.c
> new file mode 100644
> index 000000000000..653092be5938
> --- /dev/null
> +++ b/drivers/mtd/nand/spi/etron.c
> @@ -0,0 +1,98 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mtd/spinand.h>
> +
> +#define SPINAND_MFR_ETRON			0xd5
> +
> +

No double \n please

> +static SPINAND_OP_VARIANTS(read_cache_variants,
> +		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, 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 etron_ooblayout_ecc(struct mtd_info *mtd, int section,
> +					struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 72;
> +	oobregion->length = 56;

This looks highly dependent on a single chip, could you make these
values (at least the offset) dependent on the MTD device?

> +
> +	return 0;
> +}
> +
> +static int etron_ooblayout_free(struct mtd_info *mtd, int section,
> +			   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 1;
> +	oobregion->length = 71;

Same here.

> +
> +	return 0;
> +}
> +
> +static int etron_ecc_get_status(struct spinand_device *spinand, u8 status)
> +{
> +	switch (status & STATUS_ECC_MASK) {
> +	case STATUS_ECC_NO_BITFLIPS:
> +		return 0;
> +
> +	case STATUS_ECC_HAS_BITFLIPS:
> +		/* Between 1-7 bitflips were corrected */
> +		return 7;
> +
> +	case STATUS_ECC_MASK:
> +		/* Maximum bitflips were corrected */
> +		return 8;
> +
> +	case STATUS_ECC_UNCOR_ERROR:
> +		return -EBADMSG;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const struct mtd_ooblayout_ops etron_ooblayout = {
> +	.ecc = etron_ooblayout_ecc,
> +	.free = etron_ooblayout_free,
> +};

Could be above _get_status()

> +
> +static const struct spinand_info etron_spinand_table[] = {
> +	SPINAND_INFO("EM73D044VCx",
> +		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x1f),
> +		     // bpc, pagesize, oobsize, pagesperblock, bperlun, maxbadplun, ppl, lpt, #t

Please drop this comment

> +		     NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     SPINAND_HAS_QE_BIT,
> +		     SPINAND_ECCINFO(&etron_ooblayout, etron_ecc_get_status)),
> +};
> +
> +static const struct spinand_manufacturer_ops etron_spinand_manuf_ops = {
> +};
> +
> +const struct spinand_manufacturer etron_spinand_manufacturer = {
> +	.id = SPINAND_MFR_ETRON,
> +	.name = "Etron",
> +	.chips = etron_spinand_table,
> +	.nchips = ARRAY_SIZE(etron_spinand_table),
> +	.ops = &etron_spinand_manuf_ops,
> +};
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index 6988956b8492..d7c0a0439652 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -260,6 +260,7 @@ struct spinand_manufacturer {
>  };
>  
>  /* SPI NAND manufacturers */
> +extern const struct spinand_manufacturer etron_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;

Thanks,
Miquèl

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