linux-kernel - Re: [PATCH v2] mtd: spinand: Add initial support for Paragon PN26G0xA

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Date:   Tue, 25 Jun 2019 09:41:16 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Jeff Kletsky <lede@...ycomm.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>
CC:     Jeff Kletsky <git-commits@...ycomm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH v2] mtd: spinand: Add initial support for Paragon PN26G0xA

Hi Jeff,

On 18.06.19 19:08, Jeff Kletsky wrote:
> From: Jeff Kletsky <git-commits@...ycomm.com>
> 
> Add initial support for Paragon Technology
> PN26G01Axxxxx and PN26G02Axxxxx SPI NAND
> 
> Datasheets available at
> http://www.xtxtech.com/upfile/2016082517274590.pdf
> http://www.xtxtech.com/upfile/2016082517282329.pdf
> 
> Signed-off-by: Jeff Kletsky <git-commits@...ycomm.com>
> ---

Can you please add a changelog here with a list of things that changed 
from v1 to v2?

Thanks,
Frieder

>   drivers/mtd/nand/spi/Makefile  |   2 +-
>   drivers/mtd/nand/spi/core.c    |   1 +
>   drivers/mtd/nand/spi/paragon.c | 147 +++++++++++++++++++++++++++++++++
>   include/linux/mtd/spinand.h    |   1 +
>   4 files changed, 150 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/mtd/nand/spi/paragon.c
> 
> diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
> index 753125082640..9662b9c1d5a9 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 toshiba.o winbond.o
> +spinand-objs := core.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 556bfdb34455..f0f3528aab8f 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -757,6 +757,7 @@ static const struct spinand_manufacturer *spinand_manufacturers[] = {
>   	&gigadevice_spinand_manufacturer,
>   	&macronix_spinand_manufacturer,
>   	&micron_spinand_manufacturer,
> +	&paragon_spinand_manufacturer,
>   	&toshiba_spinand_manufacturer,
>   	&winbond_spinand_manufacturer,
>   };
> diff --git a/drivers/mtd/nand/spi/paragon.c b/drivers/mtd/nand/spi/paragon.c
> new file mode 100644
> index 000000000000..52307681cbd0
> --- /dev/null
> +++ b/drivers/mtd/nand/spi/paragon.c
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 Jeff Kletsky
> + *
> + * Author: Jeff Kletsky <git-commits@...ycomm.com>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mtd/spinand.h>
> +
> +
> +#define SPINAND_MFR_PARAGON	0xa1
> +
> +
> +#define PN26G0XA_STATUS_ECC_BITMASK		(3 << 4)
> +
> +#define PN26G0XA_STATUS_ECC_NONE_DETECTED	(0 << 4)
> +#define PN26G0XA_STATUS_ECC_1_7_CORRECTED	(1 << 4)
> +#define PN26G0XA_STATUS_ECC_ERRORED		(2 << 4)
> +#define PN26G0XA_STATUS_ECC_8_CORRECTED		(3 << 4)
> +
> +
> +static SPINAND_OP_VARIANTS(read_cache_variants,
> +		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, 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 pn26g0xa_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *region)
> +{
> +	if (section > 3)
> +		return -ERANGE;
> +
> +	region->offset = 6 + (15 * section); /* 4 BBM + 2 user bytes */
> +	region->length = 13;
> +
> +	return 0;
> +}
> +
> +static int pn26g0xa_ooblayout_free(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *region)
> +{
> +	if (section > 4)
> +		return -ERANGE;
> +
> +	if (section == 4) {
> +		region->offset = 64;
> +		region->length = 64;
> +	} else {
> +		region->offset = 4 + (15 * section);
> +		region->length = 2;
> +	}
> +
> +	return 0;
> +}
> +
> +static int pn26g0xa_ecc_get_status(struct spinand_device *spinand,
> +				   u8 status)
> +{
> +	switch (status & PN26G0XA_STATUS_ECC_BITMASK) {
> +	case PN26G0XA_STATUS_ECC_NONE_DETECTED:
> +		return 0;
> +
> +	case PN26G0XA_STATUS_ECC_1_7_CORRECTED:
> +		return 7;	/* Return upper limit by convention */
> +
> +	case PN26G0XA_STATUS_ECC_8_CORRECTED:
> +		return 8;
> +
> +	case PN26G0XA_STATUS_ECC_ERRORED:
> +		return -EBADMSG;
> +
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const struct mtd_ooblayout_ops pn26g0xa_ooblayout = {
> +	.ecc = pn26g0xa_ooblayout_ecc,
> +	.free = pn26g0xa_ooblayout_free,
> +};
> +
> +
> +static const struct spinand_info paragon_spinand_table[] = {
> +	SPINAND_INFO("PN26G01A", 0xe1,
> +		     NAND_MEMORG(1, 2048, 128, 64, 1024, 21, 1, 1, 1),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     0,
> +		     SPINAND_ECCINFO(&pn26g0xa_ooblayout,
> +				     pn26g0xa_ecc_get_status)),
> +	SPINAND_INFO("PN26G02A", 0xe2,
> +		     NAND_MEMORG(1, 2048, 128, 64, 2048, 41, 1, 1, 1),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     0,
> +		     SPINAND_ECCINFO(&pn26g0xa_ooblayout,
> +				     pn26g0xa_ecc_get_status)),
> +};
> +
> +static int paragon_spinand_detect(struct spinand_device *spinand)
> +{
> +	u8 *id = spinand->id.data;
> +	int ret;
> +
> +	/* Read ID returns [0][MID][DID] */
> +
> +	if (id[1] != SPINAND_MFR_PARAGON)
> +		return 0;
> +
> +	ret = spinand_match_and_init(spinand, paragon_spinand_table,
> +				     ARRAY_SIZE(paragon_spinand_table),
> +				     id[2]);
> +	if (ret)
> +		return ret;
> +
> +	return 1;
> +}
> +
> +static const struct spinand_manufacturer_ops paragon_spinand_manuf_ops = {
> +	.detect = paragon_spinand_detect,
> +};
> +
> +const struct spinand_manufacturer paragon_spinand_manufacturer = {
> +	.id = SPINAND_MFR_PARAGON,
> +	.name = "Paragon",
> +	.ops = &paragon_spinand_manuf_ops,
> +};
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index fbc0423bb4ae..4ea558bd3c46 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -227,6 +227,7 @@ struct 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;
> +extern const struct spinand_manufacturer paragon_spinand_manufacturer;
>   extern const struct spinand_manufacturer toshiba_spinand_manufacturer;
>   extern const struct spinand_manufacturer winbond_spinand_manufacturer;
>   
>