56172ab353
This patch adds support for the Nios handshake private feature on Intel PAC (Programmable Acceleration Card) N3000. The Nios is the embedded processor on the FPGA card. This private feature provides a handshake interface to FPGA Nios firmware, which receives retimer configuration command from host and executes via an internal SPI master (spi-altera). When Nios finishes the configuration, host takes over the ownership of the SPI master to control an Intel MAX10 BMC (Board Management Controller) Chip on the SPI bus. For Nios firmware handshake part, this driver requests the retimer configuration for Nios firmware on probe, and adds some sysfs nodes for user to query the onboard retimer's working mode and Nios firmware version. For SPI part, this driver adds a spi-altera platform device as well as the MAX10 BMC spi slave info. A spi-altera driver will be matched to handle the following SPI work. [mdf@kernel.org: Fixed up ABI doc kernel release] Reviewed-by: Tom Rix <trix@redhat.com> Signed-off-by: Xu Yilun <yilun.xu@intel.com> Signed-off-by: Wu Hao <hao.wu@intel.com> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Signed-off-by: Russ Weight <russell.h.weight@intel.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20210107043714.991646-8-mdf@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1.6 KiB
What: /sys/bus/dfl/devices/dfl_dev.X/fec_mode Date: Oct 2020 KernelVersion: 5.12 Contact: Xu Yilun yilun.xu@intel.com Description: Read-only. Returns the FEC mode of the 25G links of the ethernet retimers configured by Nios firmware. "rs" for Reed Solomon FEC, "kr" for Fire Code FEC, "no" for NO FEC. "not supported" if the FEC mode setting is not supported, this happens when the Nios firmware version major < 3, or no link is configured to 25G. Format: string
What: /sys/bus/dfl/devices/dfl_dev.X/retimer_A_mode Date: Oct 2020 KernelVersion: 5.12 Contact: Xu Yilun yilun.xu@intel.com Description: Read-only. Returns the enumeration value of the working mode of the retimer A configured by the Nios firmware. The value is read out from shared registers filled by the Nios firmware. Now the values could be:
- "0": Reset
- "1": 4x10G
- "2": 4x25G
- "3": 2x25G
- "4": 2x25G+2x10G
- "5": 1x25G
If the Nios firmware is updated in future to support more
retimer modes, more enumeration value is expected.
Format: 0x%x
What: /sys/bus/dfl/devices/dfl_dev.X/retimer_B_mode Date: Oct 2020 KernelVersion: 5.12 Contact: Xu Yilun yilun.xu@intel.com Description: Read-only. Returns the enumeration value of the working mode of the retimer B configured by the Nios firmware. The value format is the same as retimer_A_mode.
What: /sys/bus/dfl/devices/dfl_dev.X/nios_fw_version Date: Oct 2020 KernelVersion: 5.12 Contact: Xu Yilun yilun.xu@intel.com Description: Read-only. Returns the version of the Nios firmware in the FPGA. Its format is "major.minor.patch". Format: %x.%x.%x