linux-kernel - Re: [PATCH] mtd: spinand: Add support for ATO25D1GA

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Message-ID: <KsriIipAd1t8rfznYrBvTQbGe3yoRXOX@localhost>
Date:   Sat, 04 Jun 2022 12:26:57 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     richard@....at, vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spinand: Add support for ATO25D1GA


Miquel Raynal <miquel.raynal@...tlin.com> writes:

> Hi Aidan,
>
> aidanmacdonald.0x0@...il.com wrote on Fri,  3 Jun 2022 14:51:49 +0100:
>
>> Add support for the ATO25D1GA SPI NAND flash.
>> 
>> Datasheet:
>> - https://atta.szlcsc.com/upload/public/pdf/source/20191212/C469320_04599D67B03B078044EB65FF5AEDDDE9.pdf
>> 
>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>> ---
>>  drivers/mtd/nand/spi/Makefile |  2 +-
>>  drivers/mtd/nand/spi/ato.c    | 86 +++++++++++++++++++++++++++++++++++
>>  drivers/mtd/nand/spi/core.c   |  1 +
>>  include/linux/mtd/spinand.h   |  1 +
>>  4 files changed, 89 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/mtd/nand/spi/ato.c
>> 
>> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
>> index 80dabe6ff0f3..ae17c13d1abe 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 xtx.o
>> +spinand-objs := ato.o core.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
>
> I would keep core.o first in that list, even if it breaks alphabetical
> ordering slightly :)
>
> Otherwise the patch looks good to me.
>

Okay, I'll send a v2 to fix that.

>>  obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
>> diff --git a/drivers/mtd/nand/spi/ato.c b/drivers/mtd/nand/spi/ato.c
>> new file mode 100644
>> index 000000000000..82b377c06812
>> --- /dev/null
>> +++ b/drivers/mtd/nand/spi/ato.c
>> @@ -0,0 +1,86 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2022 Aidan MacDonald
>> + *
>> + * Author: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mtd/spinand.h>
>> +
>> +
>> +#define SPINAND_MFR_ATO		0x9b
>> +
>> +
>> +static SPINAND_OP_VARIANTS(read_cache_variants,
>> +		SPINAND_PAGE_READ_FROM_CACHE_X4_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 ato25d1ga_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 ato25d1ga_ooblayout_free(struct mtd_info *mtd, int section,
>> +				   struct mtd_oob_region *region)
>> +{
>> +	if (section > 3)
>> +		return -ERANGE;
>> +
>> +	if (section) {
>> +		region->offset = (16 * section);
>> +		region->length = 8;
>> +	} else {
>> +		/* first byte of section 0 is reserved for the BBM */
>> +		region->offset = 1;
>> +		region->length = 7;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct mtd_ooblayout_ops ato25d1ga_ooblayout = {
>> +	.ecc = ato25d1ga_ooblayout_ecc,
>> +	.free = ato25d1ga_ooblayout_free,
>> +};
>> +
>> +
>> +static const struct spinand_info ato_spinand_table[] = {
>> +	SPINAND_INFO("ATO25D1GA",
>> +		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x12),
>> +		     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(&ato25d1ga_ooblayout, NULL)),
>> +};
>> +
>> +static const struct spinand_manufacturer_ops ato_spinand_manuf_ops = {
>> +};
>> +
>> +const struct spinand_manufacturer ato_spinand_manufacturer = {
>> +	.id = SPINAND_MFR_ATO,
>> +	.name = "ATO",
>> +	.chips = ato_spinand_table,
>> +	.nchips = ARRAY_SIZE(ato_spinand_table),
>> +	.ops = &ato_spinand_manuf_ops,
>> +};
>> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
>> index d5b685d1605e..9d73910a7ae8 100644
>> --- a/drivers/mtd/nand/spi/core.c
>> +++ b/drivers/mtd/nand/spi/core.c
>> @@ -927,6 +927,7 @@ static const struct nand_ops spinand_ops = {
>>  };
>>  
>>  static const struct spinand_manufacturer *spinand_manufacturers[] = {
>> +	&ato_spinand_manufacturer,
>>  	&gigadevice_spinand_manufacturer,
>>  	&macronix_spinand_manufacturer,
>>  	&micron_spinand_manufacturer,
>> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
>> index 5584d3bb6556..6d3392a7edc6 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 ato_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

Regards,
Aidan