This is an RFC for upstreaming the Linux bus abstraction for FMC. The following text is a slightly modified extract from the documentation, which is included in the fmc-bus package. The code I'm submitting is currently maintained outside of the kernel proper. See http://www.ohwr.org/projects/fmc-bus/ . The public repository is at git://ohwr.org/fmc-projects/fmc-bus.git and the current manual is at http://www.ohwr.org/attachments/download/1845/fmc-bus-2013-01-release.pdf The whole patch-set is sent to lkml, Greg K H (for drivers/), Rob Landley and the linux-doc list (both for Documentation/). FMC is a standard developed by the VME consortium called VITA (VMEbus International Trade Association) and ratified by ANSI, the American National Standard Institute. The official documentation is called "ANSI-VITA 57.1". The wikipedia article is http://en.wikipedia.org/wiki/FMC_%E2%80%93_FPGA_Mezzanine_Card FMC (FPGA Mezzanine Card) is what we use for our I/O devices, in the context of White Rabbit and related hardware. White Rabbit is a multi-lab synchronization project; bot software and hardware for WR is hosted at www.ohwr.org . In our I/O environments we need to write drivers for each mezzanine card, and such drivers must work regardless of the carrier being used. To achieve this, we abstract the FMC interface. The FMC card is an almost square PCB, around 70x75 millimeters, that is called mezzanine in code and documentation under drivers/fmc. It usually lives plugged into another PCB for power supply and control; such bigger circuit board is called carrier from now on, and a single carrier may host more than one mezzanine. We have a carrier for PCI-E called SPEC and one for VME called SVEC, (http://www.ohwr.org/projects/spec/wiki and http://www.ohwr.org/projects/svec/wiki) but more are planned. Also, we support stand-alone devices (usually plugged on a SPEC card), controlled through Etherbone, which in turn is developed by GSI.de . This submission does not include drivers for specific cards like the SPEC or SVEC, but has software-only carriers and drivers. Nothing in the submission in specific to CERN: the code is designed to match FMC features, not our own specific needs. In the typical application the mezzanine is mostly analog while the carrier is mostly digital, and hosts an FPGA that must be configured to match the specific mezzanine and the desired application. Thus, you may need to load different FPGA images to drive different instances of the same mezzanine. FMC, as such, is not a bus in the usual meaning of the term, because most carriers have only one connector, and carriers with several connectors have completely separate electrical connections to them. This package, however, implements a bus as a software abstraction. SDB (Self Describing Bus) is a set of data structures that we use for enumerating the internal structure of an FPGA image. We also use it as a filesystem inside the FMC EEPROM, but this submission only uses it to enumerate cores inside and FPGA design. SDB is not mandatory for use of this FMC kernel bus, but if you have SDB this package can make good use of it. SDB itself is developed in the fpga-config-space OHWR project. The link to the repository is `git://ohwr.org/hdl-core-lib/fpga-config-space.git' and what is used in this project lives in the sdbfs subdirectory in there. Alessandro Rubini (8): FMC: create drivers/fmc and toplevel Kconfig question FMC: add needed headers FMC: add core bus driver FMC: add documentation for the core FMC: add a software carrier driver FMC: add a software mezzanine driver FMC: add a driver to write mezzanine EEPROM FMC: add a char-device mezzanine driver Documentation/00-INDEX | 2 + Documentation/fmc/00-INDEX | 38 ++++ Documentation/fmc/API.txt | 44 +++++ Documentation/fmc/FMC-and-SDB.txt | 89 +++++++++ Documentation/fmc/carrier.txt | 311 ++++++++++++++++++++++++++++++++ Documentation/fmc/fmc-chardev.txt | 64 +++++++ Documentation/fmc/fmc-fakedev.txt | 30 +++ Documentation/fmc/fmc-trivial.txt | 17 ++ Documentation/fmc/fmc-write-eeprom.txt | 112 ++++++++++++ Documentation/fmc/identifiers.txt | 169 +++++++++++++++++ Documentation/fmc/mezzanine.txt | 123 +++++++++++++ Documentation/fmc/parameters.txt | 56 ++++++ MAINTAINERS | 9 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/fmc/Kconfig | 51 ++++++ drivers/fmc/Makefile | 13 ++ drivers/fmc/fmc-chardev.c | 197 ++++++++++++++++++++ drivers/fmc/fmc-core.c | 255 ++++++++++++++++++++++++++ drivers/fmc/fmc-dump.c | 100 ++++++++++ drivers/fmc/fmc-fakedev.c | 308 +++++++++++++++++++++++++++++++ drivers/fmc/fmc-match.c | 108 +++++++++++ drivers/fmc/fmc-sdb.c | 258 ++++++++++++++++++++++++++ drivers/fmc/fmc-trivial.c | 101 +++++++++++ drivers/fmc/fmc-write-eeprom.c | 170 +++++++++++++++++ drivers/fmc/fru-parse.c | 82 +++++++++ include/linux/fmc-sdb.h | 36 ++++ include/linux/fmc.h | 237 ++++++++++++++++++++++++ include/linux/ipmi-fru.h | 135 ++++++++++++++ include/linux/sdb.h | 130 +++++++++++++ 30 files changed, 3248 insertions(+), 0 deletions(-) create mode 100644 Documentation/fmc/00-INDEX create mode 100644 Documentation/fmc/API.txt create mode 100644 Documentation/fmc/FMC-and-SDB.txt create mode 100644 Documentation/fmc/carrier.txt create mode 100644 Documentation/fmc/fmc-chardev.txt create mode 100644 Documentation/fmc/fmc-fakedev.txt create mode 100644 Documentation/fmc/fmc-trivial.txt create mode 100644 Documentation/fmc/fmc-write-eeprom.txt create mode 100644 Documentation/fmc/identifiers.txt create mode 100644 Documentation/fmc/mezzanine.txt create mode 100644 Documentation/fmc/parameters.txt create mode 100644 drivers/fmc/Kconfig create mode 100644 drivers/fmc/Makefile create mode 100644 drivers/fmc/fmc-chardev.c create mode 100644 drivers/fmc/fmc-core.c create mode 100644 drivers/fmc/fmc-dump.c create mode 100644 drivers/fmc/fmc-fakedev.c create mode 100644 drivers/fmc/fmc-match.c create mode 100644 drivers/fmc/fmc-sdb.c create mode 100644 drivers/fmc/fmc-trivial.c create mode 100644 drivers/fmc/fmc-write-eeprom.c create mode 100644 drivers/fmc/fru-parse.c create mode 100644 include/linux/fmc-sdb.h create mode 100644 include/linux/fmc.h create mode 100644 include/linux/ipmi-fru.h create mode 100644 include/linux/sdb.h -- 1.7.7.2 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
