diff options
author | Miquel Raynal <miquel.raynal@bootlin.com> | 2023-03-28 18:41:03 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-17 12:53:28 +0300 |
commit | 8630dfcdab0d70e93dec9c96f0f5cadf1ab579ca (patch) | |
tree | a41a6de56848048ed26ef9592e3d6d954c6be3f4 /drivers/mtd | |
parent | 897a40dbcf1ebf1d06fef729bea08bbadf1198d3 (diff) | |
download | linux-8630dfcdab0d70e93dec9c96f0f5cadf1ab579ca.tar.xz |
mtd: spi-nor: Add a RWW flag
[ Upstream commit 4eddee70140b3ae183398b246a609756546c51f1 ]
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: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230328154105.448540-7-miquel.raynal@bootlin.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Stable-dep-of: 9fd0945fe6fa ("mtd: spi-nor: spansion: Enable JFFS2 write buffer for Infineon s28hx SEMPER flash")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/spi-nor/core.c | 3 | ||||
-rw-r--r-- | drivers/mtd/spi-nor/core.h | 3 | ||||
-rw-r--r-- | drivers/mtd/spi-nor/debugfs.c | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 88da4a125c74..621e9ad4bcc3 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2440,6 +2440,9 @@ 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; } /** diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index 8a846ad86d29..f23d1e77199e 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -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 { @@ -459,6 +460,7 @@ 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 @@ -509,6 +511,7 @@ 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) diff --git a/drivers/mtd/spi-nor/debugfs.c b/drivers/mtd/spi-nor/debugfs.c index 5f56b23205d8..8b4922a1aafb 100644 --- a/drivers/mtd/spi-nor/debugfs.c +++ b/drivers/mtd/spi-nor/debugfs.c @@ -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 |