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drivers: flash: jesd216: add JESD216 API for use in shared drivers

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The spi_nor flash interface was designed for flash devices that use a
standard SPI interface to devices that are compatible with the Micron
M25P80 serial flash, identified in Linux as compatible jedec,spi-nor.

The JEDEC Serial Flash Discoverable Parameters standard (JESD216) was
designed to allow these devices to be self-describing.  As we are
increasingly being asked to support flash memories that do not use
"standard" erase sizes or commands we need data structures and helper
functions to extract information about a flash interface at runtime.
For some of these devices the commands hard-coded in the current
implementation are simply wrong.

Define generic structures that support the SFDP hierarchy and the core
Basic Flash Parameters table.  The description will also support
SPI-NAND and xSPI devices that conform to the JESD216 standards.

Add bitfield values and helper functions to extract some information
that drivers might need from JESD216 fields.  At this time only
information that is likely to be used is extracted; more may be added
in the future.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2020-05-30 16:01:55 -05:00 • committed by Anas Nashif
commit bfcd64c29d
4 changed files with 713 additions and 0 deletions
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6
drivers/flash/Kconfig
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@ -17,6 +17,12 @@ config FLASH_HAS_PAGE_LAYOUT
This option is enabled when the SoC flash driver supports
retrieving the layout of flash memory pages.
config FLASH_JESD216
bool
help
Selected by drivers that support JESD216-compatible flash
devices to enable building a common support module.
menuconfig FLASH
bool "Flash hardware support"
help