On 17.3.2017 01:51, Moritz Fischer 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@xxxxxxxxxx>
> Cc: Michal Simek <michal.simek@xxxxxxxxxx>
> Cc: Sören Brinkmann <soren.brinkmann@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: devicetree@xxxxxxxxxxxxxxx
> ---
>
> 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 | 9 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/xilinx-pr-decoupler.c | 147 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 157 insertions(+)
> create mode 100644 drivers/fpga/xilinx-pr-decoupler.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 967cda4..e42c7dc 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -69,6 +69,15 @@ 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
> + 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 cc0d364..3f04bcf 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -15,6 +15,7 @@ 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..761700c
> --- /dev/null
> +++ b/drivers/fpga/xilinx-pr-decoupler.c
> @@ -0,0 +1,147 @@
> +/*
> + * 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 ~BIT(0)
> +
> +struct xlnx_pr_decoupler_data {
> + void __iomem *io_base;
> + struct clk *clk;
> +};
> +
> +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)
> + writel(CTRL_CMD_COUPLE, priv->io_base);
> + else
> + writel(CTRL_CMD_DECOUPLE, priv->io_base);
> +
> + 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", },
I would add here that generic compatible string too.
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
Thanks,
Michal
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