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Message-ID: <CANk1AXRJq_CioHLvQQApeBNbU-gNceFv34pcuW804tnANqYOVQ@mail.gmail.com>
Date: Fri, 24 Mar 2017 10:23:18 -0500
From: Alan Tull <delicious.quinoa@...il.com>
To: Moritz Fischer <mdf@...nel.org>
Cc: linux-fpga@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michal Simek <michal.simek@...inx.com>,
Sören Brinkmann <soren.brinkmann@...inx.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] fpga: Add support for Xilinx LogiCORE PR Decoupler
On Fri, Mar 24, 2017 at 12:43 AM, Moritz Fischer <mdf@...nel.org> wrote:
> This adds support for the Xilinx LogiCORE PR Decoupler
> soft-ip that does decoupling of PR regions in the FPGA
> fabric during partial reconfiguration.
>
> Signed-off-by: Moritz Fischer <mdf@...nel.org>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
Acked-by: Alan Tull <atull@...nel.org>
> Cc: Sören Brinkmann <soren.brinkmann@...inx.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> ---
> Changes from v3:
> - Adressed build bot issues
>
> Changes from v2:
> - Added Michal's Signed-off-by
> - Added "xlnx,pr-decoupler" unversioned fallback
>
> Changes from v1:
> - Added Michal as Co-Author since I pulled in some of his code
> - Reworked clk handling in _remove()
> - Pulled in Michal's version of show_enable(), ditched priv->enabled
>
> ---
> drivers/fpga/Kconfig | 10 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/xilinx-pr-decoupler.c | 161 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 172 insertions(+)
> create mode 100644 drivers/fpga/xilinx-pr-decoupler.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index ce861a2..6eabfbe 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -63,6 +63,16 @@ config ALTERA_FREEZE_BRIDGE
> isolate one region of the FPGA from the busses while that
> region is being reprogrammed.
>
> +config XILINX_PR_DECOUPLER
> + tristate "Xilinx LogiCORE PR Decoupler"
> + depends on FPGA_BRIDGE
> + depends on HAS_IOMEM
> + help
> + Say Y to enable drivers for Xilinx LogiCORE PR Decoupler.
> + The PR Decoupler exists in the FPGA fabric to isolate one
> + region of the FPGA from the busses while that region is
> + being reprogrammed during partial reconfig.
> +
> endif # FPGA
>
> endmenu
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 8df07bc..ba94b79 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o
> obj-$(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-$(CONFIG_XILINX_PR_DECOUPLER) += xilinx-pr-decoupler.o
>
> # High Level Interfaces
> obj-$(CONFIG_FPGA_REGION) += fpga-region.o
> diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c
> new file mode 100644
> index 0000000..e359930
> --- /dev/null
> +++ b/drivers/fpga/xilinx-pr-decoupler.c
> @@ -0,0 +1,161 @@
> +/*
> + * Copyright (c) 2017, National Instruments Corp.
> + * Copyright (c) 2017, Xilix Inc
> + *
> + * FPGA Bridge Driver for the Xilinx LogiCORE Partial Reconfiguration
> + * Decoupler IP Core.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/of_device.h>
> +#include <linux/module.h>
> +#include <linux/fpga/fpga-bridge.h>
> +
> +#define CTRL_CMD_DECOUPLE BIT(0)
> +#define CTRL_CMD_COUPLE 0
> +#define CTRL_OFFSET 0
> +
> +struct xlnx_pr_decoupler_data {
> + void __iomem *io_base;
> + struct clk *clk;
> +};
> +
> +static inline void xlnx_pr_decoupler_write(struct xlnx_pr_decoupler_data *d,
> + u32 offset, u32 val)
> +{
> + writel(val, d->io_base + offset);
> +}
> +
> +static inline u32 xlnx_pr_decouple_read(const struct xlnx_pr_decoupler_data *d,
> + u32 offset)
> +{
> + return readl(d->io_base + offset);
> +}
> +
> +static int xlnx_pr_decoupler_enable_set(struct fpga_bridge *bridge, bool enable)
> +{
> + int err;
> + struct xlnx_pr_decoupler_data *priv = bridge->priv;
> +
> + err = clk_enable(priv->clk);
> + if (err)
> + return err;
> +
> + if (enable)
> + xlnx_pr_decoupler_write(priv, CTRL_OFFSET, CTRL_CMD_COUPLE);
> + else
> + xlnx_pr_decoupler_write(priv, CTRL_OFFSET, CTRL_CMD_DECOUPLE);
> +
> + clk_disable(priv->clk);
> +
> + return 0;
> +}
> +
> +static int xlnx_pr_decoupler_enable_show(struct fpga_bridge *bridge)
> +{
> + const struct xlnx_pr_decoupler_data *priv = bridge->priv;
> + u32 status;
> + int err;
> +
> + err = clk_enable(priv->clk);
> + if (err)
> + return err;
> +
> + status = readl(priv->io_base);
> +
> + clk_disable(priv->clk);
> +
> + return !status;
> +}
> +
> +static struct fpga_bridge_ops xlnx_pr_decoupler_br_ops = {
> + .enable_set = xlnx_pr_decoupler_enable_set,
> + .enable_show = xlnx_pr_decoupler_enable_show,
> +};
> +
> +static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
> + { .compatible = "xlnx,pr-decoupler-1.00", },
> + { .compatible = "xlnx,pr-decoupler", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
> +
> +static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
> +{
> + struct xlnx_pr_decoupler_data *priv;
> + int err;
> + struct resource *res;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->io_base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(priv->io_base))
> + return PTR_ERR(priv->io_base);
> +
> + priv->clk = devm_clk_get(&pdev->dev, "aclk");
> + if (IS_ERR(priv->clk)) {
> + dev_err(&pdev->dev, "input clock not found\n");
> + return PTR_ERR(priv->clk);
> + }
> +
> + err = clk_prepare_enable(priv->clk);
> + if (err) {
> + dev_err(&pdev->dev, "unable to enable clock\n");
> + return err;
> + }
> +
> + clk_disable(priv->clk);
> +
> + err = fpga_bridge_register(&pdev->dev, "Xilinx PR Decoupler",
> + &xlnx_pr_decoupler_br_ops, priv);
> +
> + if (err) {
> + dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler");
> + clk_unprepare(priv->clk);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int xlnx_pr_decoupler_remove(struct platform_device *pdev)
> +{
> + struct fpga_bridge *bridge = platform_get_drvdata(pdev);
> + struct xlnx_pr_decoupler_data *p = bridge->priv;
> +
> + fpga_bridge_unregister(&pdev->dev);
> +
> + clk_unprepare(p->clk);
> +
> + return 0;
> +}
> +
> +static struct platform_driver xlnx_pr_decoupler_driver = {
> + .probe = xlnx_pr_decoupler_probe,
> + .remove = xlnx_pr_decoupler_remove,
> + .driver = {
> + .name = "xlnx_pr_decoupler",
> + .of_match_table = of_match_ptr(xlnx_pr_decoupler_of_match),
> + },
> +};
> +
> +module_platform_driver(xlnx_pr_decoupler_driver);
> +
> +MODULE_DESCRIPTION("Xilinx Partial Reconfiguration Decoupler");
> +MODULE_AUTHOR("Moritz Fischer <mdf@...nel.org>");
> +MODULE_AUTHOR("Michal Simek <michal.simek@...inx.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>
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