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# SPDX-License-Identifier: GPL-2.0-only
menuconfig MTD_SPI_NOR
tristate "SPI NOR device support"
depends on MTD
depends on MTD && SPI_MASTER
select SPI_MEM
help
This is the framework for the SPI NOR which can be used by the SPI
device drivers and the SPI NOR device driver.
if MTD_SPI_NOR
config MTD_SPI_NOR_USE_4K_SECTORS
bool "Use small 4096 B erase sectors"
default y
help
Many flash memories support erasing small (4096 B) sectors. Depending
on the usage this feature may provide performance gain in comparison
to erasing whole blocks (32/64 KiB).
Changing a small part of the flash's contents is usually faster with
small sectors. On the other hand erasing should be faster when using
64 KiB block instead of 16 × 4 KiB sectors.
Please note that some tools/drivers/filesystems may not work with
4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum).
choice
prompt "Software write protection at boot"
default MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE
config MTD_SPI_NOR_SWP_DISABLE
bool "Disable SWP on any flashes (legacy behavior)"
help
This option disables the software write protection on any SPI
flashes at boot-up.
Depending on the flash chip this either clears the block protection
bits or does a "Global Unprotect" command.
Don't use this if you intent to use the software write protection
of your SPI flash. This is only to keep backwards compatibility.
config MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE
bool "Disable SWP on flashes w/ volatile protection bits"
help
Some SPI flashes have volatile block protection bits, ie. after a
power-up or a reset the flash is software write protected by
default.
This option disables the software write protection for these kind
of flashes while keeping it enabled for any other SPI flashes
which have non-volatile write protection bits.
If the software write protection will be disabled depending on
the flash either the block protection bits are cleared or a
"Global Unprotect" command is issued.
If you are unsure, select this option.
config MTD_SPI_NOR_SWP_KEEP
bool "Keep software write protection as is"
help
If you select this option the software write protection of any
SPI flashes will not be changed. If your flash is software write
protected or will be automatically software write protected after
power-up you have to manually unlock it before you are able to
write to it.
endchoice
source "drivers/mtd/spi-nor/controllers/Kconfig"
endif # MTD_SPI_NOR
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