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| author | Pratyush Yadav <p.yadav@ti.com> | 2020-12-01 13:27:10 +0300 |
|---|---|---|
| committer | Vignesh Raghavendra <vigneshr@ti.com> | 2020-12-07 20:27:29 +0300 |
| commit | afd473e8582702e89aed89a4be957ffd37423009 (patch) | |
| tree | 089903e9705052b0f7bd04a63b06b39c68d2906a /drivers/mtd/spi-nor/core.h | |
| parent | c69942bda5152d764ee7d897d1627d64c7177ea1 (diff) | |
| download | linux-afd473e8582702e89aed89a4be957ffd37423009.tar.xz | |
mtd: spi-nor: core: Allow flashes to specify MTD writesize
Some flashes like the Cypress S28 family use ECC. Under this ECC scheme,
multi-pass writes to an ECC block is not allowed. In other words, once
data is programmed to an ECC block, it can't be programmed again without
erasing it first.
Upper layers like file systems need to be given this information so they
do not cause error conditions on the flash by attempting multi-pass
programming. This can be done by setting 'writesize' in 'struct
mtd_info'.
Set the default to 1 but allow flashes to modify it in fixup hooks. If
more flashes show up with this constraint in the future it might be
worth it to add it to 'struct flash_info', but for now increasing its
size is not worth it.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20201201102711.8727-3-p.yadav@ti.com
Diffstat (limited to 'drivers/mtd/spi-nor/core.h')
| -rw-r--r-- | drivers/mtd/spi-nor/core.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index 0a775a7b5606..5ab3f269a23c 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -193,6 +193,8 @@ struct spi_nor_locking_ops { * Serial Flash Discoverable Parameters (SFDP) tables. * * @size: the flash memory density in bytes. + * @writesize Minimal writable flash unit size. Defaults to 1. Set to + * ECC unit size for ECC-ed flashes. * @page_size: the page size of the SPI NOR flash memory. * @rdsr_dummy: dummy cycles needed for Read Status Register command. * @rdsr_addr_nbytes: dummy address bytes needed for Read Status Register @@ -219,6 +221,7 @@ struct spi_nor_locking_ops { */ struct spi_nor_flash_parameter { u64 size; + u32 writesize; u32 page_size; u8 rdsr_dummy; u8 rdsr_addr_nbytes; |