Re: [EXT] [PATCH] mtd: spinand: micron: add support for MT29F1G01AAADD

[Marco Felsch <m.felsch@pengutronix.de>]

Hi Boris,

On 19-11-18 18:39, Boris Brezillon wrote:
> On Mon, 18 Nov 2019 15:09:51 +0100
> Marco Felsch <m.felsch@pengutronix.de> wrote:
> 
> > Hi Shiva,
> > 
> > On 19-11-18 10:16, Shivamurthy Shastri (sshivamurthy) wrote:
> > > Hi Marco,
> > >   
> > > > 
> > > > The MT29F1G01AAADD is a single die, SLC based SPI NAND. It has a
> > > > capacity of 1Gb and supports 4-bit ECC. The datasheet can be found [1].
> > > > 
> > > > Unfortunatly the linked device is marked as EoL, but I will expect that
> > > > the MT29F1G01AAADDH4-ITX behaves the same way.
> > > > 
> > > > [1]
> > > > https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdata
> > > > sheet.octopart.com%2FMT29F1G01AAADDH4-IT%3AD-Micron-datasheet-
> > > > 11572380.pdf&amp;data=02%7C01%7Csshivamurthy%40micron.com%7C21a
> > > > da5347828461980a408d7642021a9%7Cf38a5ecd28134862b11bac1d563c806f%
> > > > 7C0%7C1%7C637087961499818902&amp;sdata=%2Fh%2FHfUoSnl8qqSVClVfp
> > > > ykvi3UiDEZFTn%2BVCsAf9IaM%3D&amp;reserved=0
> > > > 
> > > > Cc: Peter Pan <peterpandong@micron.com>
> > > > Cc: sshivamurthy@micron.com
> > > > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> > > > ---
> > > > v2:
> > > > - Convert 0x10 into 16 for ooblayout description
> > > > - Don't break web link within commit message
> > > > 
> > > >  drivers/mtd/nand/spi/micron.c | 68
> > > > +++++++++++++++++++++++++++++++++++
> > > >  1 file changed, 68 insertions(+)
> > > > 
> > > > diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
> > > > index 7d7b1f7fcf71..70e278759bd3 100644
> > > > --- a/drivers/mtd/nand/spi/micron.c
> > > > +++ b/drivers/mtd/nand/spi/micron.c
> > > > @@ -34,6 +34,18 @@ static
> > > > SPINAND_OP_VARIANTS(update_cache_variants,
> > > >  		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
> > > >  		SPINAND_PROG_LOAD(false, 0, NULL, 0));
> > > > 
> > > > +static SPINAND_OP_VARIANTS(read_cache_variants_mt29f1g01aaadd,
> > > > +		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_mt29f1g01aaadd,
> > > > +		SPINAND_PROG_LOAD(true, 0, NULL, 0));
> > > > +
> > > > +static SPINAND_OP_VARIANTS(update_cache_variants_mt29f1g01aaadd,
> > > > +		SPINAND_PROG_LOAD(false, 0, NULL, 0));
> > > > +
> > > >  static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
> > > >  					struct mtd_oob_region *region)
> > > >  {
> > > > @@ -90,6 +102,52 @@ static int mt29f2g01abagd_ecc_get_status(struct
> > > > spinand_device *spinand,
> > > >  	return -EINVAL;
> > > >  }
> > > > 
> > > > +static int mt29f1g01aaadd_ooblayout_ecc(struct mtd_info *mtd, int
> > > > section,
> > > > +					struct mtd_oob_region *region)
> > > > +{
> > > > +	if (section > 3)
> > > > +		return -ERANGE;
> > > > +
> > > > +	region->offset = (section * 16) + 8;
> > > > +	region->length = 8;
> > > > +
> > > > +	return 0;
> > > > +}
> > > > +
> > > > +static int mt29f1g01aaadd_ooblayout_free(struct mtd_info *mtd, int
> > > > section,
> > > > +					 struct mtd_oob_region *region)
> > > > +{
> > > > +	if (section > 3)
> > > > +		return -ERANGE;
> > > > +
> > > > +	/* 2 bytes for the BBM + 2 bytes to skip non-ecc memory */
> > > > +	region->offset = (section * 16) + 4;
> > > > +	region->length = 4;
> > > > +
> > > > +	return 0;
> > > > +}
> > > > +
> > > > +static const struct mtd_ooblayout_ops mt29f1g01aaadd_ooblayout = {
> > > > +	.ecc = mt29f1g01aaadd_ooblayout_ecc,
> > > > +	.free = mt29f1g01aaadd_ooblayout_free,
> > > > +};
> > > > +
> > > > +static int mt29f1g01aaadd_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:
> > > > +		/* 1 to 4-bit error detected and corrected */
> > > > +		return 4;
> > > > +	case STATUS_ECC_UNCOR_ERROR:
> > > > +		return -EBADMSG;
> > > > +	default:
> > > > +		return -EINVAL;
> > > > +	}
> > > > +}
> > > > +
> > > >  static const struct spinand_info micron_spinand_table[] = {
> > > >  	SPINAND_INFO("MT29F2G01ABAGD", 0x24,
> > > >  		     NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 2, 1, 1),
> > > > @@ -100,6 +158,16 @@ static const struct spinand_info
> > > > micron_spinand_table[] = {
> > > >  		     0,
> > > >  		     SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
> > > >  				     mt29f2g01abagd_ecc_get_status)),
> > > > +	SPINAND_INFO("MT29F1G01AAADD", 0x12,
> > > > +		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 2, 1, 1),
> > > > +		     NAND_ECCREQ(4, 2048),  
> > > 
> > > I think, this should be NAND_ECCREQ(4, 512).  
> > 
> > I don't thinks so, according the datasheet [1], section ECC Protection:
> > 
> > 8<--------------------------------------
> > During a PROGRAM operation, the device calculates an ECC code on the 2k
> > page in the cache register, before the page is written to the NAND
> > Flash array. The ECC code is stored in the spare area of the page.
> > 8<--------------------------------------
> 
> Looking at "Table 11: ECC Protection" it really seems to be 4bit/512. I
> think the sentence you quoted just means the ECC is calculated for each
> 512 bytes block in the page and written at once (no subpage write).

Yes that part confuses me a bit and than I used the description above..
I will change that, thanks for the explanation.

> BTW, there's an easy way to know who's right => nandbiterrs.

Thanks for that hint :)

Regards,
  Marco

> 
> > 
> > [1] https://datasheet.octopart.com/MT29F1G01AAADDH4-IT:D-Micron-datasheet-11572380.pdf
> > 
> > Regards,
> >   Marco
> > 
> > >   
> > > > +		     SPINAND_INFO_OP_VARIANTS(
> > > > +
> > > > 	&read_cache_variants_mt29f1g01aaadd,
> > > > +
> > > > 	&write_cache_variants_mt29f1g01aaadd,
> > > > +
> > > > 	&update_cache_variants_mt29f1g01aaadd),
> > > > +		     0,
> > > > +		     SPINAND_ECCINFO(&mt29f1g01aaadd_ooblayout,
> > > > +				     mt29f1g01aaadd_ecc_get_status)),
> > > >  };
> > > > 
> > > >  static int micron_spinand_detect(struct spinand_device *spinand)
> > > > --
> > > > 2.20.1  
> > > 
> > > Thanks,
> > > Shiva
> > >   
> > 
> 
> 

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