From: Moritz Fischer <mdf@kernel.org> To: linux-fpga@vger.kernel.org Cc: robh+dt@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, "Moritz Fischer" <mdf@kernel.org>, "Michal Simek" <michal.simek@xilinx.com>, "Sören Brinkmann" <soren.brinkmann@xilinx.com>, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 2/2] fpga: Add support for Xilinx LogiCORE PR Decoupler Date: Fri, 10 Mar 2017 13:30:35 -0800 [thread overview] Message-ID: <1489181435-3151-2-git-send-email-mdf@kernel.org> (raw) In-Reply-To: <1489181435-3151-1-git-send-email-mdf@kernel.org> 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@kernel.org> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Sören Brinkmann <soren.brinkmann@xilinx.com> Cc: linux-kernel@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/fpga/Kconfig | 9 +++ drivers/fpga/Makefile | 1 + drivers/fpga/xilinx-pr-decoupler.c | 156 +++++++++++++++++++++++++++++++++++++ 3 files changed, 166 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..07afdd6 --- /dev/null +++ b/drivers/fpga/xilinx-pr-decoupler.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2017, National Instruments Corp. + * + * 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_OFFSET 0x00 +#define STATUS_OFFSET 0x00 + +#define CTRL_CMD_MASK BIT(0) +#define CTRL_CMD_DECOUPLE BIT(0) +#define CTRL_CMD_COUPLE ~BIT(0) + +#define STATUS_STATE_MASK BIT(0) +#define STATUS_STATE_COUPLED ~BIT(0) +#define STATUS_STATE_DECOUPLED BIT(0) + +struct xlnx_pr_decoupler_data { + void __iomem *io_base; + struct clk *clk; + bool enable; +}; + +static inline void xlnx_pr_decoupler_write(struct xlnx_pr_decoupler_data *p, + u32 offset, u32 val) +{ + writel(val, p->io_base + offset); +} + +static inline u32 xlnx_pr_decoupler_read(const struct xlnx_pr_decoupler_data *p, + u32 offset) +{ + return readl(p->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; + + if (priv->enable != enable) { + err = clk_enable(priv->clk); + if (err) + return err; + + xlnx_pr_decoupler_write(priv, CTRL_OFFSET, + enable ? CTRL_CMD_COUPLE : + 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 *p = bridge->priv; + + return p->enable; +} + +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", }, + {}, +}; +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; + u32 status; + 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, "ref_clk"); + 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; + } + + status = xlnx_pr_decoupler_read(priv, STATUS_OFFSET); + priv->enable = !!(status & STATUS_STATE_MASK); + + 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) +{ + fpga_bridge_unregister(&pdev->dev); + + 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@kernel.org>"); +MODULE_LICENSE("GPL v2"); -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: mdf@kernel.org (Moritz Fischer) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/2] fpga: Add support for Xilinx LogiCORE PR Decoupler Date: Fri, 10 Mar 2017 13:30:35 -0800 [thread overview] Message-ID: <1489181435-3151-2-git-send-email-mdf@kernel.org> (raw) In-Reply-To: <1489181435-3151-1-git-send-email-mdf@kernel.org> 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@kernel.org> Cc: Michal Simek <michal.simek@xilinx.com> Cc: S?ren Brinkmann <soren.brinkmann@xilinx.com> Cc: linux-kernel at vger.kernel.org Cc: devicetree at vger.kernel.org --- drivers/fpga/Kconfig | 9 +++ drivers/fpga/Makefile | 1 + drivers/fpga/xilinx-pr-decoupler.c | 156 +++++++++++++++++++++++++++++++++++++ 3 files changed, 166 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..07afdd6 --- /dev/null +++ b/drivers/fpga/xilinx-pr-decoupler.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2017, National Instruments Corp. + * + * 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_OFFSET 0x00 +#define STATUS_OFFSET 0x00 + +#define CTRL_CMD_MASK BIT(0) +#define CTRL_CMD_DECOUPLE BIT(0) +#define CTRL_CMD_COUPLE ~BIT(0) + +#define STATUS_STATE_MASK BIT(0) +#define STATUS_STATE_COUPLED ~BIT(0) +#define STATUS_STATE_DECOUPLED BIT(0) + +struct xlnx_pr_decoupler_data { + void __iomem *io_base; + struct clk *clk; + bool enable; +}; + +static inline void xlnx_pr_decoupler_write(struct xlnx_pr_decoupler_data *p, + u32 offset, u32 val) +{ + writel(val, p->io_base + offset); +} + +static inline u32 xlnx_pr_decoupler_read(const struct xlnx_pr_decoupler_data *p, + u32 offset) +{ + return readl(p->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; + + if (priv->enable != enable) { + err = clk_enable(priv->clk); + if (err) + return err; + + xlnx_pr_decoupler_write(priv, CTRL_OFFSET, + enable ? CTRL_CMD_COUPLE : + 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 *p = bridge->priv; + + return p->enable; +} + +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", }, + {}, +}; +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; + u32 status; + 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, "ref_clk"); + 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; + } + + status = xlnx_pr_decoupler_read(priv, STATUS_OFFSET); + priv->enable = !!(status & STATUS_STATE_MASK); + + 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) +{ + fpga_bridge_unregister(&pdev->dev); + + 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@kernel.org>"); +MODULE_LICENSE("GPL v2"); -- 2.7.4
next prev parent reply other threads:[~2017-03-10 21:31 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-10 21:30 [PATCH 1/2] doc: Add bindings document for Xilinx LogiCore PR Decoupler Moritz Fischer 2017-03-10 21:30 ` Moritz Fischer 2017-03-10 21:30 ` Moritz Fischer 2017-03-10 21:30 ` Moritz Fischer [this message] 2017-03-10 21:30 ` [PATCH 2/2] fpga: Add support for Xilinx LogiCORE " Moritz Fischer 2017-03-10 22:42 ` Moritz Fischer 2017-03-10 22:42 ` Moritz Fischer 2017-03-10 22:42 ` Moritz Fischer 2017-03-13 10:27 ` Michal Simek 2017-03-13 10:27 ` Michal Simek 2017-03-13 10:27 ` Michal Simek 2017-03-13 10:27 ` Michal Simek 2017-03-13 16:18 ` Moritz Fischer 2017-03-13 16:18 ` Moritz Fischer 2017-03-13 16:18 ` Moritz Fischer 2017-03-14 6:40 ` Michal Simek 2017-03-14 6:40 ` Michal Simek 2017-03-14 6:40 ` Michal Simek 2017-03-14 6:40 ` Michal Simek 2017-03-13 10:29 ` [PATCH 1/2] doc: Add bindings document for Xilinx LogiCore " Michal Simek 2017-03-13 10:29 ` Michal Simek 2017-03-13 10:29 ` Michal Simek 2017-03-13 10:29 ` Michal Simek 2017-03-24 15:33 [PATCH 0/2] fpga: " Alan Tull 2017-03-24 15:33 ` [PATCH 2/2] fpga: Add support for Xilinx LogiCORE " Alan Tull 2017-03-24 15:33 ` Alan Tull
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