[v11,0/2] Lattice sysCONFIG SPI FPGA manager

Message

Ivan Bornyakov Sept. 13, 2022, 1:07 p.m. UTC

Add support to the FPGA manager for programming Lattice FPGAs over slave
SPI sysCONFIG interface. ECP5 and MachXO2 are supported.

WARNING: I only have HW with ECP5, so can't vouch for the MachXO2.
	 MachXO2's support is based on existing machxo2-spi.c and
	 publicly available documentation, it's not tested on real
	 hardware.

ChangeLog:
  v1 -> v2:
    * remove "spi" from compatible string
    * reword description in dt-bindings doc
    * add reference to spi-peripheral-props.yaml in dt-binding doc
    * fix DTS example in dt-bindings doc: 4-spaces indentations, no
      undersores in node names.
  v2 -> v3:
    * fix typo "##size-cells" -> "#size-cells" in dt-bindings example
  v3 -> v4:
    * dt-bindings: reword description
    * dt-bindings: revert props order
  v4 -> v5:
    * dt-bindings: remove trailing dot from title
    * dt-bindings: reword description to avoid driver reference
    * dt-bindings: add "Reviewed-by: Krzysztof Kozlowski" tag
  v5 -> v6:
    * ecp5-spi: lock SPI bus for exclusive usage in
      ecp5_ops_write_init(), release in ecp5_ops_write_complete()
      or on error
  v6 -> v7:
    * ecp5-spi.c -> lattice-sysconfig-spi.c. Reworked to represent
      generalized sysCONFIG port with implementations for ECP5 and
      MachXO2
    * lattice,ecp5-fpga-mgr.yaml -> lattice,sysconfig.yaml. Reworked to
      document both ECP5 and MachXO2 sysCONFIG.
    * dt-bindings: remove "Reviewed-by: Krzysztof Kozlowski" tag as doc
      was rewritten by a considerable amount.
  v7 -> v8:
    * dt-bindings: move "program-gpios", "init-gpios" and "done-gpios"
      to top-level properties and disallow them for MachXO2 variant.
  v8 -> v9:
    * dt-bindings: "program-gpios", "init-gpios" and "done-gpios" are
      now optional for both ECP5 and MachXO2
    * lattice-sysconfig-spi.c -> sysconfig-spi.c + sysconfig.c +
      sysconfig.h
        ** reworked to be one sysCONFIG FPGA Manager rather than two
	   distinct ECP5 and MachXO2 managers
	** splitted to port type agnostic sysconfig.c and SPI-specific
	   sysconfig-spi.c
	** command transfer function moved to callback for ease of
	   adding another port type, such as I2C
  v9 -> v10:
    * split sysconfig_transfer() callback into separate command_write()
      and command_write_then_read(). There are too many transfers
      without readback.
    * add command_write_with_data() callback which performs single
      transfer of command + data. It's needed for better abstraction of
      paged bitstream write routine.
    * move sysconfig_lsc_burst_init() to bitstream_burst_write_init()
      callback to break dependence of sysconfig.c from sysconfig-spi.c
    * move sysconfig_lsc_burst_complete() to bitstream_burst_write_complete()
      callback to break dependence of sysconfig.c from sysconfig-spi.c
    * add bitstream_burst_write() to abstract fpga_manager_ops->write()
      from bus type
    * remove struct spi_device from struct sysconfig_priv, use
      to_spi_device()
    * move fpga_manager_ops initialization to sysconfig.c
  v10 -> v11:
    * rename sysconfig_lsc_burst_init() to sysconfig_spi_lsc_burst_init()
    * rename sysconfig_bitstream_burst_write() to
      sysconfig_spi_bitstream_burst_write()
    * rename sysconfig_lsc_burst_complete() to
      sysconfig_spi_lsc_burst_complete()
    * rename "ecp5-fpga-mgr" to "sysconfig-ecp5"
    * rename "machxo2-fpga-mgr" to "sysconfig-machxo2"
    * move spi_max_speed_hz from struct sysconfig_fpga_priv to
      struct sysconfig_spi_fpga_priv, which is local to sysconfig-spi.c
    * remove SPI bus unlock on write error form
      sysconfig_spi_bitstream_burst_write(), call
      sysconfig_burst_write_complete() on error in
      sysconfig_bitstream_burst_write() instead.

Ivan Bornyakov (2):
  fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager
  dt-bindings: fpga: document Lattice sysCONFIG FPGA manager

 .../bindings/fpga/lattice,sysconfig.yaml      | 102 ++++
 drivers/fpga/Kconfig                          |   7 +
 drivers/fpga/Makefile                         |   3 +
 drivers/fpga/sysconfig-spi.c                  | 210 +++++++
 drivers/fpga/sysconfig.c                      | 528 ++++++++++++++++++
 drivers/fpga/sysconfig.h                      |  62 ++
 6 files changed, 912 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml
 create mode 100644 drivers/fpga/sysconfig-spi.c
 create mode 100644 drivers/fpga/sysconfig.c
 create mode 100644 drivers/fpga/sysconfig.h