RE: [PATCH v3 1/2] mtd: spi-nor: add macros related to MICRON flash

[Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>]

Hi Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@xxxxxxxxxxx]
> Sent: Friday, October 12, 2018 11:38 AM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>
> Cc: linux-mtd@xxxxxxxxxxxxxxxxxxx; linux-spi@xxxxxxxxxxxxxxx;
> tudor.ambarus@xxxxxxxxxxxxx; marek.vasut@xxxxxxxxx;
> cyrille.pitchen@xxxxxxxxxx; computersforpeace@xxxxxxxxx;
> frieder.schrempf@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add macros related to MICRON flash
> 
> On Fri, 12 Oct 2018 02:23:08 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx> wrote:
> 
> > Some MICRON related macros in spi-nor domain were ST.
> > Rename entries related to STMicroelectronics under macro SNOR_MFR_ST.
> >
> > Added entry of MFR Id for Micron flashes, 0x002C.
> >
> > Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@xxxxxxx>
> > Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> > ---
> > Changes for v3:
> > - None
> > Changes for v2:
> > - None
> >
> >  drivers/mtd/spi-nor/spi-nor.c | 9 ++++++---
> >  include/linux/mtd/cfi.h       | 1 +
> >  include/linux/mtd/spi-nor.h   | 3 ++-
> >  3 files changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c
> > b/drivers/mtd/spi-nor/spi-nor.c index 9407ca5..b8b494f 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -284,6 +284,7 @@ static inline int set_4byte(struct spi_nor *nor, const
> struct flash_info *info,
> >  	u8 cmd;
> >
> >  	switch (JEDEC_MFR(info)) {
> > +	case SNOR_MFR_ST:
> >  	case SNOR_MFR_MICRON:
> >  		/* Some Micron need WREN command; all will accept it */
> >  		need_wren = true;
> > @@ -1388,7 +1389,7 @@ static int spi_nor_is_locked(struct mtd_info *mtd,
> loff_t ofs, uint64_t len)
> >  	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SECT_4K |
> SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> >  	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048,
> > SPI_NOR_QUAD_READ) },
> >
> > -	/* Micron */
> > +	/* Micron <--> ST Micro */
> >  	{ "n25q016a",	 INFO(0x20bb15, 0, 64 * 1024,   32, SECT_4K |
> SPI_NOR_QUAD_READ) },
> >  	{ "n25q032",	 INFO(0x20ba16, 0, 64 * 1024,   64,
> SPI_NOR_QUAD_READ) },
> >  	{ "n25q032a",	 INFO(0x20bb16, 0, 64 * 1024,   64,
> SPI_NOR_QUAD_READ) },
> > @@ -3223,6 +3224,7 @@ static int spi_nor_init_params(struct spi_nor *nor,
> >  			params->quad_enable = macronix_quad_enable;
> >  			break;
> >
> > +		case SNOR_MFR_ST:
> >  		case SNOR_MFR_MICRON:
> >  			break;
> >
> > @@ -3671,8 +3673,9 @@ int spi_nor_scan(struct spi_nor *nor, const char
> *name,
> >  	mtd->_resume = spi_nor_resume;
> >
> >  	/* NOR protection support for STmicro/Micron chips and similar */
> > -	if (JEDEC_MFR(info) == SNOR_MFR_MICRON ||
> > -			info->flags & SPI_NOR_HAS_LOCK) {
> > +	if (JEDEC_MFR(info) == SNOR_MFR_ST ||
> > +	    JEDEC_MFR(info) == SNOR_MFR_MICRON ||
> > +	    info->flags & SPI_NOR_HAS_LOCK) {
> >  		nor->flash_lock = stm_lock;
> >  		nor->flash_unlock = stm_unlock;
> >  		nor->flash_is_locked = stm_is_locked;
> 
> Are you sure ST and Micron NORs work the same way WRT locking, 4-byte
> addressing mode and Quad enable?

Have checked for the Micron flash, MT35x wrt locking, 4-byte addressing mode.
For Macronix and Spansion flash there is special handling required for quad mode but not needed for ST flash.
This flash didn't support quad mode and have checked that other Micron flash also didn't need special handling for quad mode.
--
Regards
Yogesh Gaur.
> 
> > diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h index
> > 9b57a9b..cbf7716 100644
> > --- a/include/linux/mtd/cfi.h
> > +++ b/include/linux/mtd/cfi.h
> > @@ -377,6 +377,7 @@ struct cfi_fixup {
> >  #define CFI_MFR_SHARP		0x00B0
> >  #define CFI_MFR_SST		0x00BF
> >  #define CFI_MFR_ST		0x0020 /* STMicroelectronics */
> > +#define CFI_MFR_MICRON		0x002C /* Micron */
> >  #define CFI_MFR_TOSHIBA		0x0098
> >  #define CFI_MFR_WINBOND		0x00DA
> >
> > diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> > index 7f0c730..8b1acf6 100644
> > --- a/include/linux/mtd/spi-nor.h
> > +++ b/include/linux/mtd/spi-nor.h
> > @@ -23,7 +23,8 @@
> >  #define SNOR_MFR_ATMEL		CFI_MFR_ATMEL
> >  #define SNOR_MFR_GIGADEVICE	0xc8
> >  #define SNOR_MFR_INTEL		CFI_MFR_INTEL
> > -#define SNOR_MFR_MICRON		CFI_MFR_ST /* ST Micro <--> Micron
> */
> > +#define SNOR_MFR_ST		CFI_MFR_ST	/* ST Micro */
> > +#define SNOR_MFR_MICRON		CFI_MFR_MICRON	/* Micron */
> >  #define SNOR_MFR_MACRONIX	CFI_MFR_MACRONIX
> >  #define SNOR_MFR_SPANSION	CFI_MFR_AMD
> >  #define SNOR_MFR_SST		CFI_MFR_SST


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/