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Date: Tue, 27 Oct 2020 11:54:27 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Xu Yilun <yilun.xu@...el.com>
Cc: mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
trix@...hat.com, lgoncalv@...hat.com, hao.wu@...el.com,
Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
Russ Weight <russell.h.weight@...el.com>,
YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH v11 1/2] fpga: dfl: add support for N3000 Nios private
feature
On Tue, Oct 27, 2020 at 05:23:00PM +0800, Xu Yilun wrote:
> 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@...nel.org: Fixed up MAINTAINERS file to include added ABI doc]
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> Reviewed-by: Tom Rix <trix@...hat.com>
> ---
> v3: add the doc for this driver
> minor fixes for comments from Tom
> v4: move the err log in regmap implementation, and delete
> n3000_nios_writel/readl(), they have nothing to wrapper now.
> some minor fixes and comments improvement.
> v5: fix the output of fec_mode sysfs inf to "no" on 10G configuration,
> cause no FEC mode could be configured for 10G.
> rename the dfl_n3000_nios_* to n3000_nios_*
> improves comments.
> v6: fix the output of fec_mode sysfs inf to "not supported" if in 10G,
> or the firmware version major < 3.
> minor fixes and improves comments.
> v7: improves comments.
> v8: add sysfs interfaces for retimer mode, also doc update.
> delete duplicated sysfs interfaces description in doc.
> minor fixes.
> v9: delete the retimer FEC mode configuration via module_parameter.
> update the kernel version of the sysfs interfaces in Doc.
> merge the patch "Make m10_n3000_info static" (https://lore.kernel.org/linux-fpga/52d8411e-13d8-1e91-756d-131802f5f445@huawei.com/T/#t)
> remove the tags of Maintainers, this implementation is changed.
> v10: improve the name of some macros, functions and variables.
> refactor the FEC mode setting and reading.
> refactor the retimer init error checking and dumping.
> refactor the loop timeout for regbus reading & write.
> some minor fixes.
> v11: use sysfs_emit instead of sprintf.
> rebase to 5.10-rc1.
> ---
> .../ABI/testing/sysfs-bus-dfl-devices-n3000-nios | 47 ++
> MAINTAINERS | 2 +-
> drivers/fpga/Kconfig | 11 +
> drivers/fpga/Makefile | 2 +
> drivers/fpga/dfl-n3000-nios.c | 588 +++++++++++++++++++++
> 5 files changed, 649 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
> create mode 100644 drivers/fpga/dfl-n3000-nios.c
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios b/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
> new file mode 100644
> index 0000000..a505537
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
> @@ -0,0 +1,47 @@
> +What: /sys/bus/dfl/devices/dfl_dev.X/fec_mode
> +Date: Oct 2020
> +KernelVersion: 5.11
> +Contact: Xu Yilun <yilun.xu@...el.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: 5.11
> +Contact: Xu Yilun <yilun.xu@...el.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: 5.11
> +Contact: Xu Yilun <yilun.xu@...el.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: 5.11
> +Contact: Xu Yilun <yilun.xu@...el.com>
> +Description: Read-only. Returns the version of the Nios firmware in the
> + FPGA. Its format is "major.minor.patch".
> + Format: %x.%x.%x
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9bbb378..bedb18d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6883,7 +6883,7 @@ M: Wu Hao <hao.wu@...el.com>
> R: Tom Rix <trix@...hat.com>
> L: linux-fpga@...r.kernel.org
> S: Maintained
> -F: Documentation/ABI/testing/sysfs-bus-dfl
> +F: Documentation/ABI/testing/sysfs-bus-dfl*
> F: Documentation/fpga/dfl.rst
> F: drivers/fpga/dfl*
> F: include/linux/dfl.h
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 7cd5a29..5d7f0ae 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -191,6 +191,17 @@ config FPGA_DFL_AFU
> to the FPGA infrastructure via a Port. There may be more than one
> Port/AFU per DFL based FPGA device.
>
> +config FPGA_DFL_NIOS_INTEL_PAC_N3000
> + tristate "FPGA DFL NIOS Driver for Intel PAC N3000"
> + depends on FPGA_DFL
> + select REGMAP
> + help
> + This is the driver for the N3000 Nios private feature on Intel
> + PAC (Programmable Acceleration Card) N3000. It communicates
> + with the embedded Nios processor to configure the retimers on
> + the card. It also instantiates the SPI master (spi-altera) for
> + the card's BMC (Board Management Controller).
> +
(...)
> +{
> + struct n3000_nios *nn = dev_get_drvdata(&ddev->dev);
> +
> + destroy_altera_spi_controller(nn);
> +}
> +
> +#define FME_FEATURE_ID_N3000_NIOS 0xd
> +
> +static const struct dfl_device_id n3000_nios_ids[] = {
> + { FME_ID, FME_FEATURE_ID_N3000_NIOS },
> + { }
> +};
Why isn't here a module device table?
Best regards,
Krzysztof
> +
> +static struct dfl_driver n3000_nios_driver = {
> + .drv = {
> + .name = "dfl-n3000-nios",
> + .dev_groups = n3000_nios_groups,
> + },
> + .id_table = n3000_nios_ids,
> + .probe = n3000_nios_probe,
> + .remove = n3000_nios_remove,
> +};
> +
> +module_dfl_driver(n3000_nios_driver);
> +
> +MODULE_DEVICE_TABLE(dfl, n3000_nios_ids);
> +MODULE_DESCRIPTION("Driver for Nios private feature on Intel PAC N3000");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>
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