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authorWu Hao <hao.wu@intel.com>2018-06-30 08:53:13 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-15 13:55:45 +0200
commit543be3d8c999b30e1e1c05d30c1ea3f2d922340b (patch)
treeae6401cfee61ca718ecbd2021f8d4e1359019659 /drivers/fpga/Kconfig
parent41a8b2c56470b7e4e3e2db93324d50bbbf60cdc4 (diff)
downloadlinux-543be3d8c999b30e1e1c05d30c1ea3f2d922340b.tar.gz
fpga: add device feature list support
Device Feature List (DFL) defines a feature list structure that creates a linked list of feature headers within the MMIO space to provide an extensible way of adding features. This patch introduces a kernel module to provide basic infrastructure to support FPGA devices which implement the Device Feature List. Usually there will be different features and their sub features linked into the DFL. This code provides common APIs for feature enumeration, it creates a container device (FPGA base region), walks through the DFLs and creates platform devices for feature devices (Currently it only supports two different feature devices, FPGA Management Engine (FME) and Port which the Accelerator Function Unit (AFU) connected to). In order to enumerate the DFLs, the common APIs required low level driver to provide necessary enumeration information (e.g. address for each device feature list for given device) and fill it to the dfl_fpga_enum_info data structure. Please refer to below description for APIs added for enumeration. Functions for enumeration information preparation: *dfl_fpga_enum_info_alloc allocate enumeration information data structure. *dfl_fpga_enum_info_add_dfl add a device feature list to dfl_fpga_enum_info data structure. *dfl_fpga_enum_info_free free dfl_fpga_enum_info data structure and related resources. Functions for feature device enumeration: *dfl_fpga_feature_devs_enumerate enumerate feature devices and return container device. *dfl_fpga_feature_devs_remove remove feature devices under given container device. Signed-off-by: Tim Whisonant <tim.whisonant@intel.com> Signed-off-by: Enno Luebbers <enno.luebbers@intel.com> Signed-off-by: Shiva Rao <shiva.rao@intel.com> Signed-off-by: Christopher Rauer <christopher.rauer@intel.com> Signed-off-by: Zhang Yi <yi.z.zhang@intel.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Wu Hao <hao.wu@intel.com> Acked-by: Alan Tull <atull@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga/Kconfig')
-rw-r--r--drivers/fpga/Kconfig16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index ee9c5420c47f..4880fd676a19 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -130,4 +130,20 @@ config OF_FPGA_REGION
Support for loading FPGA images by applying a Device Tree
overlay.
+config FPGA_DFL
+ tristate "FPGA Device Feature List (DFL) support"
+ select FPGA_BRIDGE
+ select FPGA_REGION
+ help
+ Device Feature List (DFL) defines a feature list structure that
+ creates a linked list of feature headers within the MMIO space
+ to provide an extensible way of adding features for FPGA.
+ Driver can walk through the feature headers to enumerate feature
+ devices (e.g. FPGA Management Engine, Port and Accelerator
+ Function Unit) and their private features for target FPGA devices.
+
+ Select this option to enable common support for Field-Programmable
+ Gate Array (FPGA) solutions which implement Device Feature List.
+ It provides enumeration APIs and feature device infrastructure.
+
endif # FPGA