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memory: dfl-emif: add the DFL EMIF private feature driver

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This driver is for the EMIF private feature implemented under FPGA
Device Feature List (DFL) framework. It is used to expose memory
interface status information as well as memory clearing control.

The purpose of memory clearing block is to zero out all private memory
when FPGA is to be reprogrammed. This gives users a reliable method to
prevent potential data leakage.

[mdf@kernel.org: Fixed up ABI doc]

Reviewed-by: Tom Rix <trix@redhat.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/20210107043714.991646-9-mdf@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yilun
2021-01-06 20:37:14 -08:00
committed by Greg Kroah-Hartman
parent 56172ab353
commit 477dfdccfc
4 changed files with 243 additions and 0 deletions
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drivers/memory/Kconfig
+9
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@@ -137,6 +137,15 @@ config TI_EMIF_SRAM
sequence so this driver provides several relocatable PM functions
for the SoC PM code to use.
config FPGA_DFL_EMIF
tristate "FPGA DFL EMIF Driver"
depends on FPGA_DFL && HAS_IOMEM
help
This driver is for the EMIF private feature implemented under
FPGA Device Feature List (DFL) framework. It is used to expose
memory interface status information as well as memory clearing
control.
config MVEBU_DEVBUS
bool "Marvell EBU Device Bus Controller"
default y if PLAT_ORION