Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c
new file mode 100644
index 0000000000..208d9560f5
--- /dev/null
+++ b/drivers/fpga/xilinx-pr-decoupler.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017, National Instruments Corp.
+ * Copyright (c) 2017, Xilinx Inc
+ *
+ * FPGA Bridge Driver for the Xilinx LogiCORE Partial Reconfiguration
+ * Decoupler IP Core.
+ */
+
+#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_config_data {
+	const char *name;
+};
+
+struct xlnx_pr_decoupler_data {
+	const struct xlnx_config_data *ipconfig;
+	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 = xlnx_pr_decouple_read(priv, CTRL_OFFSET);
+
+	clk_disable(priv->clk);
+
+	return !status;
+}
+
+static const struct fpga_bridge_ops xlnx_pr_decoupler_br_ops = {
+	.enable_set = xlnx_pr_decoupler_enable_set,
+	.enable_show = xlnx_pr_decoupler_enable_show,
+};
+
+#ifdef CONFIG_OF
+static const struct xlnx_config_data decoupler_config = {
+	.name = "Xilinx PR Decoupler",
+};
+
+static const struct xlnx_config_data shutdown_config = {
+	.name = "Xilinx DFX AXI Shutdown Manager",
+};
+
+static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
+	{ .compatible = "xlnx,pr-decoupler-1.00", .data = &decoupler_config },
+	{ .compatible = "xlnx,pr-decoupler", .data = &decoupler_config },
+	{ .compatible = "xlnx,dfx-axi-shutdown-manager-1.00",
+					.data = &shutdown_config },
+	{ .compatible = "xlnx,dfx-axi-shutdown-manager",
+					.data = &shutdown_config },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
+#endif
+
+static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct xlnx_pr_decoupler_data *priv;
+	struct fpga_bridge *br;
+	int err;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	if (np) {
+		const struct of_device_id *match;
+
+		match = of_match_node(xlnx_pr_decoupler_of_match, np);
+		if (match && match->data)
+			priv->ipconfig = match->data;
+	}
+
+	priv->io_base = devm_platform_ioremap_resource(pdev, 0);
+	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))
+		return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk),
+				     "input clock not found\n");
+
+	err = clk_prepare_enable(priv->clk);
+	if (err) {
+		dev_err(&pdev->dev, "unable to enable clock\n");
+		return err;
+	}
+
+	clk_disable(priv->clk);
+
+	br = fpga_bridge_register(&pdev->dev, priv->ipconfig->name,
+				  &xlnx_pr_decoupler_br_ops, priv);
+	if (IS_ERR(br)) {
+		err = PTR_ERR(br);
+		dev_err(&pdev->dev, "unable to register %s",
+			priv->ipconfig->name);
+		goto err_clk;
+	}
+
+	platform_set_drvdata(pdev, br);
+
+	return 0;
+
+err_clk:
+	clk_unprepare(priv->clk);
+
+	return err;
+}
+
+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(bridge);
+
+	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@kernel.org>");
+MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>");
+MODULE_LICENSE("GPL v2");