Unverified Commit 4eddee70 authored by Miquel Raynal's avatar Miquel Raynal Committed by Tudor Ambarus
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mtd: spi-nor: Add a RWW flag 



Introduce a new (no SFDP) flag for the feature that we are about to
support: Read While Write. This means, if the chip has several banks and
supports RWW, once a page of data to write has been transferred into the
chip's internal SRAM, another read operation happening on a different
bank can be performed during the tPROG delay.

Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230328154105.448540-7-miquel.raynal@bootlin.com


Signed-off-by: default avatarTudor Ambarus <tudor.ambarus@linaro.org>
parent e96d4605

drivers/mtd/spi-nor/core.c

+3 −0
Original line number Diff line number Diff line
@@ -2530,6 +2530,9 @@ static void spi_nor_init_flags(struct spi_nor *nor) 


	if (flags & NO_CHIP_ERASE)

		nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;



	if (flags & SPI_NOR_RWW)

		nor->flags |= SNOR_F_RWW;

}



/**

drivers/mtd/spi-nor/core.h

+3 −0
Original line number Diff line number Diff line
@@ -130,6 +130,7 @@ enum spi_nor_option_flags { 
	SNOR_F_IO_MODE_EN_VOLATILE = BIT(11),

	SNOR_F_SOFT_RESET	= BIT(12),

	SNOR_F_SWP_IS_VOLATILE	= BIT(13),

	SNOR_F_RWW		= BIT(14),

};



struct spi_nor_read_command {
@@ -462,6 +463,7 @@ struct spi_nor_fixups { 
 *   NO_CHIP_ERASE:           chip does not support chip erase.

 *   SPI_NOR_NO_FR:           can't do fastread.

 *   SPI_NOR_QUAD_PP:         flash supports Quad Input Page Program.

 *   SPI_NOR_RWW:             flash supports reads while write.

 *

 * @no_sfdp_flags:  flags that indicate support that can be discovered via SFDP.

 *                  Used when SFDP tables are not defined in the flash. These
@@ -513,6 +515,7 @@ struct flash_info { 
#define NO_CHIP_ERASE			BIT(7)

#define SPI_NOR_NO_FR			BIT(8)

#define SPI_NOR_QUAD_PP			BIT(9)

#define SPI_NOR_RWW			BIT(10)



	u8 no_sfdp_flags;

#define SPI_NOR_SKIP_SFDP		BIT(0)

drivers/mtd/spi-nor/debugfs.c

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ static const char *const snor_f_names[] = { 
	SNOR_F_NAME(IO_MODE_EN_VOLATILE),

	SNOR_F_NAME(SOFT_RESET),

	SNOR_F_NAME(SWP_IS_VOLATILE),

	SNOR_F_NAME(RWW),

};

#undef SNOR_F_NAME