From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> Followup to "Yet another stab at a fpga framework" (https://lkml.org/lkml/2014/8/1/517) One of the problems with writing this framework has been the wide variety of use cases. My perspective has mostly been for a fpga bolted to a SoC. Having said that, I really hope this can be useful for as many uses as possible, while still being integrated into the kernel in a way that is Linux-like. Three basic methods of programming a FPGA are supported: * Load firmware using sysfs (see patch 0002 header for example) * Load firmware using Device Tree overlay (see patch 0003) * The core fpga-mgr.c exports enough functions for any driver to use to get the FPGA programmed. If someone needs another interface, the core functions should give enough functionality to make that possible. If the fpga is programmed using firmware, resume is supported. Big looming problem in firmware class for us here is that FPGA image files can easily be 10's to 100's of megabytes. If we have FPGA's that are chained, the image file for several FPGA's is concatenated. So then you can multiply that. High level changes from previous version: * I went ahead and put the sysfs interface into the core although I think it could just as well be separate. * Rework the state/status stuff to stop the programming steps. In the event of error, the state machine is left at a state with '_ERR' in its name. state is available in sysfs, including these error states. * Added ability to reset the FPGA from sysfs. If people like this, let me know. If not it may not be needed as that should happen in the normal programming steps. bus.c adds support for programming from Device Tree overlays. That code was tested from Pantelis' branch; the rest of this was tested on for-next. Alan Alan Tull (3): fpga manager: add sysfs interface document fpga manager: framework core fpga manager: bus driver Documentation/ABI/testing/sysfs-class-fpga-manager | 38 ++ drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/fpga/Kconfig | 28 + drivers/fpga/Makefile | 11 + drivers/fpga/bus.c | 124 +++++ drivers/fpga/fpga-mgr.c | 551 ++++++++++++++++++++ include/linux/fpga-mgr.h | 117 +++++ 8 files changed, 872 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-fpga-manager create mode 100644 drivers/fpga/Kconfig create mode 100644 drivers/fpga/Makefile create mode 100644 drivers/fpga/bus.c create mode 100644 drivers/fpga/fpga-mgr.c create mode 100644 include/linux/fpga-mgr.h -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
