[PATCH 4/4] fpga: zynqmp: Add afi config driver
Xu Yilun
yilun.xu at intel.com
Sat Aug 27 05:26:29 PDT 2022
On 2022-08-24 at 09:25:42 +0530, Nava kishore Manne wrote:
> Add zynqmp AXI FIFO interface(AFI) config driver. This is useful for the
> configuration of the PS-PL interface on Zynq US+ MPSoC platform.
Please help illustrate how to use the device for FPGA reprogramming, why
it should be implemented as an FPGA bridge.
>From the code I actually didn't see any operation that gates the
fpga-region from other part of the machine.
>
> Signed-off-by: Nava kishore Manne <nava.kishore.manne at amd.com>
> ---
> MAINTAINERS | 6 ++
> drivers/fpga/Kconfig | 13 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/zynqmp-afi.c | 211 ++++++++++++++++++++++++++++++++++++++
> 4 files changed, 231 insertions(+)
> create mode 100644 drivers/fpga/zynqmp-afi.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 20ffac651214..957e753e6406 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8032,6 +8032,12 @@ F: Documentation/fpga/
> F: drivers/fpga/
> F: include/linux/fpga/
>
> +FPGA ZYNQMP PS-PL BRIDGE DRIVER
> +M: Nava kishore Manne <nava.kishore.manne at amd.com>
> +S: Supported
> +F: Documentation/devicetree/bindings/fpga/xlnx,zynqmp-afi-fpga.yaml
> +F: drivers/fpga/zynqmp-afi.c
> +
> INTEL MAX10 BMC SECURE UPDATES
> M: Russ Weight <russell.h.weight at intel.com>
> L: linux-fpga at vger.kernel.org
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 6c416955da53..c08794d30fb5 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -130,6 +130,19 @@ config XILINX_PR_DECOUPLER
> reconfiguration, preventing the system deadlock that can
> occur if AXI transactions are interrupted by DFX.
>
> +config ZYNQMP_AFI
> + tristate "Xilinx ZYNQMP AFI support"
> + depends on FPGA_BRIDGE
> + help
> + Say Y to enable drivers to handle the PS-PL clocks configurations
> + and PS-PL Bus-width. Xilinx Zynq US+ MPSoC connect the PS to the
> + programmable logic (PL) through the AXI port. This AXI port helps
> + to establish the data path between the PS and PL.
> + In-order to establish the proper communication path between PS and PL,
> + the AXI port data path should be configured with the proper Bus-width
> + values and it will also handles the PS-PL reset signals to reset the
> + PL domain.
Same concern, please describe its relationship to FPGA reprogramming.
> +
> config FPGA_REGION
> tristate "FPGA Region"
> depends on FPGA_BRIDGE
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 42ae8b58abce..94cfe60972db 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_FPGA_BRIDGE) += fpga-bridge.o
> obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE) += altera-hps2fpga.o altera-fpga2sdram.o
> obj-$(CONFIG_ALTERA_FREEZE_BRIDGE) += altera-freeze-bridge.o
> obj-$(CONFIG_XILINX_PR_DECOUPLER) += xilinx-pr-decoupler.o
> +obj-$(CONFIG_ZYNQMP_AFI) += zynqmp-afi.o
>
> # High Level Interfaces
> obj-$(CONFIG_FPGA_REGION) += fpga-region.o
> diff --git a/drivers/fpga/zynqmp-afi.c b/drivers/fpga/zynqmp-afi.c
> new file mode 100644
> index 000000000000..bc975d304039
> --- /dev/null
> +++ b/drivers/fpga/zynqmp-afi.c
> @@ -0,0 +1,211 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2022 Xilinx, Inc.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/firmware/xlnx-zynqmp.h>
> +#include <linux/fpga/fpga-bridge.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +/* Registers and special values for doing register-based operations */
> +#define AFI_RDCHAN_CTRL_OFFSET 0x00
> +#define AFI_WRCHAN_CTRL_OFFSET 0x14
> +#define AFI_BUSWIDTH_MASK BIT(0)
> +
> +/**
> + * struct zynqmp_afi - AFI register description.
> + * @dev: device that owns this.
> + * @of_node: Device Tree overlay.
> + * @resets: Pointer to the reset control for ps-pl resets.
> + */
> +struct zynqmp_afi {
> + struct device *dev;
> + struct device_node *of_node;
> + struct reset_control *resets;
> +};
> +
> +/**
> + * struct zynqmp_afi_configreg - AFI configuration registers info.
> + * @reg: Name of the AFI configuration register.
> + * @id: Register index value.
> + */
> +struct zynqmp_afi_configreg {
> + char *reg;
> + u32 id;
> +};
> +
> +static struct zynqmp_afi_configreg afi_cfgreg[] = {
> + {.reg = "xlnx,afi-fm0-rd-bus-width", .id = AFIFM0_RDCTRL},
> + {.reg = "xlnx,afi-fm1-rd-bus-width", .id = AFIFM1_RDCTRL},
> + {.reg = "xlnx,afi-fm2-rd-bus-width", .id = AFIFM2_RDCTRL},
> + {.reg = "xlnx,afi-fm3-rd-bus-width", .id = AFIFM3_RDCTRL},
> + {.reg = "xlnx,afi-fm4-rd-bus-width", .id = AFIFM4_RDCTRL},
> + {.reg = "xlnx,afi-fm5-rd-bus-width", .id = AFIFM5_RDCTRL},
> + {.reg = "xlnx,afi-fm6-rd-bus-width", .id = AFIFM6_RDCTRL},
> + {.reg = "xlnx,afi-fm0-wr-bus-width", .id = AFIFM0_WRCTRL},
> + {.reg = "xlnx,afi-fm1-wr-bus-width", .id = AFIFM1_WRCTRL},
> + {.reg = "xlnx,afi-fm2-wr-bus-width", .id = AFIFM2_WRCTRL},
> + {.reg = "xlnx,afi-fm3-wr-bus-width", .id = AFIFM3_WRCTRL},
> + {.reg = "xlnx,afi-fm4-wr-bus-width", .id = AFIFM4_WRCTRL},
> + {.reg = "xlnx,afi-fm5-wr-bus-width", .id = AFIFM5_WRCTRL},
> + {.reg = "xlnx,afi-fm6-wr-bus-width", .id = AFIFM6_WRCTRL},
> + {.reg = "xlnx,afi-fs-ss0-bus-width", .id = AFIFS},
> + {.reg = "xlnx,afi-fs-ss2-bus-width", .id = AFIFS_SS2},
> + {}
> +};
> +
> +static int zynqmp_afi_config(struct zynqmp_afi *afi_data)
> +{
> + struct zynqmp_afi_configreg *cfgptr = afi_cfgreg;
> + struct device_node *np = afi_data->of_node;
> + u32 afi_ss0_val, afi_ss1_val, bus_width;
> + int ret;
> +
> + while (cfgptr->reg) {
> + ret = of_property_read_u32(np, cfgptr->reg, &bus_width);
> + if (!ret) {
> + if (cfgptr->id == AFIFS_SS2) {
> + if (bus_width == 32)
> + ret = zynqmp_pm_afi(AFIFS_SS2,
> + AFIFS_SS_BUS_WIDTH_32_CONFIG_VAL);
> + else if (bus_width == 64)
> + ret = zynqmp_pm_afi(AFIFS_SS2,
> + AFIFS_SS0_SS2_BUS_WIDTH_64_CONFIG_VAL);
> + else if (bus_width == 128)
> + ret = zynqmp_pm_afi(AFIFS_SS2,
> + AFIFS_SS0_SS2_BUS_WIDTH_128_CONFIG_VAL);
> + else
> + return -EINVAL;
> + } else if (cfgptr->id == AFIFS) {
> + if (bus_width == 32)
> + afi_ss0_val = AFIFS_SS_BUS_WIDTH_32_CONFIG_VAL;
> + else if (bus_width == 64)
> + afi_ss0_val = AFIFS_SS0_SS2_BUS_WIDTH_64_CONFIG_VAL;
> + else if (bus_width == 128)
> + afi_ss0_val = AFIFS_SS0_SS2_BUS_WIDTH_128_CONFIG_VAL;
> + else
> + return -EINVAL;
> +
> + ret = of_property_read_u32(np, "xlnx,afi-fs-ss1-bus-width",
> + &bus_width);
> + if (!ret) {
> + if (bus_width == 32)
> + afi_ss1_val = AFIFS_SS_BUS_WIDTH_32_CONFIG_VAL;
> + else if (bus_width == 64)
> + afi_ss1_val = AFIFS_SS1_BUS_WIDTH_64_CONFIG_VAL;
> + else if (bus_width == 128)
> + afi_ss1_val = AFIFS_SS1_BUS_WIDTH_128_CONFIG_VAL;
> + else
> + return -EINVAL;
> +
> + ret = zynqmp_pm_afi(AFIFS, afi_ss1_val | afi_ss0_val);
> + }
> + } else {
> + if (bus_width == 32)
> + ret = zynqmp_pm_afi(cfgptr->id,
> + AFIFM_BUS_WIDTH_32_CONFIG_VAL);
> + else if (bus_width == 64)
> + ret = zynqmp_pm_afi(cfgptr->id,
> + AFIFM_BUS_WIDTH_64_CONFIG_VAL);
> + else if (bus_width == 128)
> + ret = zynqmp_pm_afi(cfgptr->id,
> + AFIFM_BUS_WIDTH_128_CONFIG_VAL);
> + else
> + return -EINVAL;
> + }
> + }
> + cfgptr++;
> + }
> +
> + return 0;
> +}
> +
> +static int zynqmp_afi_enable_set(struct fpga_bridge *bridge, bool enable)
> +{
> + struct device_node *overlay = bridge->info->overlay;
> + struct zynqmp_afi *priv = bridge->priv;
> + int ret = 0;
> +
> + if (enable) {
> + reset_control_reset(priv->resets);
> + return 0;
> + }
> +
> + of_node_get(overlay);
> + priv->of_node =
> + of_find_node_with_property(overlay,
> + "xlnx,afi-fm0-rd-bus-width");
I'm a little confused here. The fpga_image_info.overlay is for
fpga-region, but from your binding doc this property is for this afi
device. You want to add another overlay targeting afi dev node during
reprograming?
> + if (priv->of_node)
> + ret = zynqmp_afi_config(priv);
> + of_node_put(priv->of_node);
> +
> + return ret;
> +}
> +
> +static const struct fpga_bridge_ops zynqmp_afi_br_ops = {
> + .enable_set = zynqmp_afi_enable_set,
> +};
> +
> +static const struct of_device_id zynqmp_afi_of_match[] = {
> + { .compatible = "xlnx,zynqmp-afi-fpga" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, zynqmp_afi_of_match);
> +
> +static int zynqmp_afi_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct zynqmp_afi *priv;
> + struct fpga_bridge *br;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->dev = dev;
> +
> + priv->resets = devm_reset_control_array_get_optional_exclusive(&pdev->dev);
> + if (IS_ERR(priv->resets))
> + return PTR_ERR(priv->resets);
> +
> + br = fpga_bridge_register(dev, "Xilinx ZynqMP AFI",
> + &zynqmp_afi_br_ops, priv);
> + if (IS_ERR(br)) {
> + dev_err(dev, "unable to register Xilinx ZynqMP AFI");
Need a "\n" at the end?
Thanks,
Yilun
> + return PTR_ERR(br);
> + }
> +
> + platform_set_drvdata(pdev, br);
> +
> + return 0;
> +}
> +
> +static int zynqmp_afi_remove(struct platform_device *pdev)
> +{
> + struct fpga_bridge *bridge = platform_get_drvdata(pdev);
> +
> + fpga_bridge_unregister(bridge);
> +
> + return 0;
> +}
> +
> +static struct platform_driver zynqmp_afi_driver = {
> + .probe = zynqmp_afi_probe,
> + .remove = zynqmp_afi_remove,
> + .driver = {
> + .name = "zynqmp_afi",
> + .of_match_table = of_match_ptr(zynqmp_afi_of_match),
> + },
> +};
> +
> +module_platform_driver(zynqmp_afi_driver);
> +
> +MODULE_DESCRIPTION("ZYNQMP FPGA AXI FIFO interface configuration module");
> +MODULE_AUTHOR("Nava kishore Manne <nava.kishore.manne at amd.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.25.1
>
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