linux-kernel - Re: [PATCH v2 1/1] mtd: spi-nor: micron-st: Enable locking for n25q256ax1/mt25qu256a

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Date:   Wed, 19 Oct 2022 10:21:23 +0200
From:   Michael Walle <michael@...le.cc>
To:     Eliav Farber <farbere@...zon.com>
Cc:     tudor.ambarus@...rochip.com, pratyush@...nel.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        talel@...zon.com, jonnyc@...zon.com, hhhawa@...zon.com,
        hanochu@...zon.com, itamark@...zon.com, shellykz@...zon.com,
        amitlavi@...zon.com, dkl@...zon.com
Subject: Re: [PATCH v2 1/1] mtd: spi-nor: micron-st: Enable locking for
 n25q256ax1/mt25qu256a

Hi,

Am 2022-10-19 09:16, schrieb Eliav Farber:
> n25q256ax1 [1] and mt25qu256a [2] (both have same jedec_id - 0x20bb19)
> use the 4 bit Block Protection scheme and support Top/Bottom protection
> via the BP and TB bits of the Status Register.
> BP3 is located in bit 6 of the Status Register.
> Tested on both n25q256ax1 and mt25qu256a.
> 
> [1] 
> https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_3v.pdf
> [2] 
> https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-a/mt25q_qljs_u_256_aba_0.pdf

If you respin, you can use a "Link:" tag for the URL above.

> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
> xxd -p
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp
> 53464450060101ff00060110300000ff84000102800000ffffffffffffff
> ffffffffffffffffffffffffffffffffffffe520fbffffffff0f29eb276b
> 273b27bbffffffffffff27bbffff29eb0c2010d80f520000244a99008b8e
> 03d4ac0127387a757a75fbbdd55c4a0f82ff81bd3d36ffffffffffffffff
> ffffffffffffffffffe7ffff21dcffff
> 
> md5sum
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp
> 5ea738216f68c9f98987bb3725699a32
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp
> 
> cat
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/jedec_id
> 20bb19104400
> 
> cat
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/partname
> mt25qu256a
> 
> cat
> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/manufacturer
> st

That's the mt25qu256a SFDP. What about the n25q256ax1?

Thanks!
-michael

> 
> v2 --> v1:
> - Enable locking also for mt25qu256a.
> - Dump the SFDP tables.
> 
>  drivers/mtd/spi-nor/micron-st.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/micron-st.c 
> b/drivers/mtd/spi-nor/micron-st.c
> index 3c9681a3f7a3..f4d0153a5b1b 100644
> --- a/drivers/mtd/spi-nor/micron-st.c
> +++ b/drivers/mtd/spi-nor/micron-st.c
> @@ -201,11 +201,15 @@ static const struct flash_info st_nor_parts[] = {
>  		MFR_FLAGS(USE_FSR)
>  	},
>  	{ "mt25qu256a",  INFO6(0x20bb19, 0x104400, 64 * 1024,  512)
> +		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
> +		      SPI_NOR_BP3_SR_BIT6)
>  		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
>  		FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
>  		MFR_FLAGS(USE_FSR)
>  	},
>  	{ "n25q256ax1",  INFO(0x20bb19, 0, 64 * 1024,  512)
> +		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
> +		      SPI_NOR_BP3_SR_BIT6)
>  		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_QUAD_READ)
>  		MFR_FLAGS(USE_FSR)
>  	},