1 files changed, 345 insertions, 0 deletions

diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
new file mode 100644
index 000000000000..f257d3812110
--- /dev/null
+++ b/drivers/misc/xilinx_sdfec.c
@@ -0,0 +1,345 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx SDFEC
+ *
+ * Copyright (C) 2019 Xilinx, Inc.
+ *
+ * Description:
+ * This driver is developed for SDFEC16 (Soft Decision FEC 16nm)
+ * IP. It exposes a char device which supports file operations
+ * like  open(), close() and ioctl().
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#define DEV_NAME_LEN 12
+
+static struct idr dev_idr;
+static struct mutex dev_idr_lock;
+
+/**
+ * struct xsdfec_clks - For managing SD-FEC clocks
+ * @core_clk: Main processing clock for core
+ * @axi_clk: AXI4-Lite memory-mapped clock
+ * @din_words_clk: DIN Words AXI4-Stream Slave clock
+ * @din_clk: DIN AXI4-Stream Slave clock
+ * @dout_clk: DOUT Words AXI4-Stream Slave clock
+ * @dout_words_clk: DOUT AXI4-Stream Slave clock
+ * @ctrl_clk: Control AXI4-Stream Slave clock
+ * @status_clk: Status AXI4-Stream Slave clock
+ */
+struct xsdfec_clks {
+	struct clk *core_clk;
+	struct clk *axi_clk;
+	struct clk *din_words_clk;
+	struct clk *din_clk;
+	struct clk *dout_clk;
+	struct clk *dout_words_clk;
+	struct clk *ctrl_clk;
+	struct clk *status_clk;
+};
+
+/**
+ * struct xsdfec_dev - Driver data for SDFEC
+ * @regs: device physical base address
+ * @dev: pointer to device struct
+ * @miscdev: Misc device handle
+ * @error_data_lock: Error counter and states spinlock
+ * @clks: Clocks managed by the SDFEC driver
+ * @dev_name: Device name
+ * @dev_id: Device ID
+ *
+ * This structure contains necessary state for SDFEC driver to operate
+ */
+struct xsdfec_dev {
+	void __iomem *regs;
+	struct device *dev;
+	struct miscdevice miscdev;
+	/* Spinlock to protect state_updated and stats_updated */
+	spinlock_t error_data_lock;
+	struct xsdfec_clks clks;
+	char dev_name[DEV_NAME_LEN];
+	int dev_id;
+};
+
+static const struct file_operations xsdfec_fops = {
+	.owner = THIS_MODULE,
+};
+
+static int xsdfec_clk_init(struct platform_device *pdev,
+			   struct xsdfec_clks *clks)
+{
+	int err;
+
+	clks->core_clk = devm_clk_get(&pdev->dev, "core_clk");
+	if (IS_ERR(clks->core_clk)) {
+		dev_err(&pdev->dev, "failed to get core_clk");
+		return PTR_ERR(clks->core_clk);
+	}
+
+	clks->axi_clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
+	if (IS_ERR(clks->axi_clk)) {
+		dev_err(&pdev->dev, "failed to get axi_clk");
+		return PTR_ERR(clks->axi_clk);
+	}
+
+	clks->din_words_clk = devm_clk_get(&pdev->dev, "s_axis_din_words_aclk");
+	if (IS_ERR(clks->din_words_clk)) {
+		if (PTR_ERR(clks->din_words_clk) != -ENOENT) {
+			err = PTR_ERR(clks->din_words_clk);
+			return err;
+		}
+		clks->din_words_clk = NULL;
+	}
+
+	clks->din_clk = devm_clk_get(&pdev->dev, "s_axis_din_aclk");
+	if (IS_ERR(clks->din_clk)) {
+		if (PTR_ERR(clks->din_clk) != -ENOENT) {
+			err = PTR_ERR(clks->din_clk);
+			return err;
+		}
+		clks->din_clk = NULL;
+	}
+
+	clks->dout_clk = devm_clk_get(&pdev->dev, "m_axis_dout_aclk");
+	if (IS_ERR(clks->dout_clk)) {
+		if (PTR_ERR(clks->dout_clk) != -ENOENT) {
+			err = PTR_ERR(clks->dout_clk);
+			return err;
+		}
+		clks->dout_clk = NULL;
+	}
+
+	clks->dout_words_clk =
+		devm_clk_get(&pdev->dev, "s_axis_dout_words_aclk");
+	if (IS_ERR(clks->dout_words_clk)) {
+		if (PTR_ERR(clks->dout_words_clk) != -ENOENT) {
+			err = PTR_ERR(clks->dout_words_clk);
+			return err;
+		}
+		clks->dout_words_clk = NULL;
+	}
+
+	clks->ctrl_clk = devm_clk_get(&pdev->dev, "s_axis_ctrl_aclk");
+	if (IS_ERR(clks->ctrl_clk)) {
+		if (PTR_ERR(clks->ctrl_clk) != -ENOENT) {
+			err = PTR_ERR(clks->ctrl_clk);
+			return err;
+		}
+		clks->ctrl_clk = NULL;
+	}
+
+	clks->status_clk = devm_clk_get(&pdev->dev, "m_axis_status_aclk");
+	if (IS_ERR(clks->status_clk)) {
+		if (PTR_ERR(clks->status_clk) != -ENOENT) {
+			err = PTR_ERR(clks->status_clk);
+			return err;
+		}
+		clks->status_clk = NULL;
+	}
+
+	err = clk_prepare_enable(clks->core_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable core_clk (%d)", err);
+		return err;
+	}
+
+	err = clk_prepare_enable(clks->axi_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable axi_clk (%d)", err);
+		goto err_disable_core_clk;
+	}
+
+	err = clk_prepare_enable(clks->din_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable din_clk (%d)", err);
+		goto err_disable_axi_clk;
+	}
+
+	err = clk_prepare_enable(clks->din_words_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable din_words_clk (%d)", err);
+		goto err_disable_din_clk;
+	}
+
+	err = clk_prepare_enable(clks->dout_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable dout_clk (%d)", err);
+		goto err_disable_din_words_clk;
+	}
+
+	err = clk_prepare_enable(clks->dout_words_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable dout_words_clk (%d)",
+			err);
+		goto err_disable_dout_clk;
+	}
+
+	err = clk_prepare_enable(clks->ctrl_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable ctrl_clk (%d)", err);
+		goto err_disable_dout_words_clk;
+	}
+
+	err = clk_prepare_enable(clks->status_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable status_clk (%d)\n", err);
+		goto err_disable_ctrl_clk;
+	}
+
+	return err;
+
+err_disable_ctrl_clk:
+	clk_disable_unprepare(clks->ctrl_clk);
+err_disable_dout_words_clk:
+	clk_disable_unprepare(clks->dout_words_clk);
+err_disable_dout_clk:
+	clk_disable_unprepare(clks->dout_clk);
+err_disable_din_words_clk:
+	clk_disable_unprepare(clks->din_words_clk);
+err_disable_din_clk:
+	clk_disable_unprepare(clks->din_clk);
+err_disable_axi_clk:
+	clk_disable_unprepare(clks->axi_clk);
+err_disable_core_clk:
+	clk_disable_unprepare(clks->core_clk);
+
+	return err;
+}
+
+static void xsdfec_disable_all_clks(struct xsdfec_clks *clks)
+{
+	clk_disable_unprepare(clks->status_clk);
+	clk_disable_unprepare(clks->ctrl_clk);
+	clk_disable_unprepare(clks->dout_words_clk);
+	clk_disable_unprepare(clks->dout_clk);
+	clk_disable_unprepare(clks->din_words_clk);
+	clk_disable_unprepare(clks->din_clk);
+	clk_disable_unprepare(clks->core_clk);
+	clk_disable_unprepare(clks->axi_clk);
+}
+
+static void xsdfec_idr_remove(struct xsdfec_dev *xsdfec)
+{
+	mutex_lock(&dev_idr_lock);
+	idr_remove(&dev_idr, xsdfec->dev_id);
+	mutex_unlock(&dev_idr_lock);
+}
+
+static int xsdfec_probe(struct platform_device *pdev)
+{
+	struct xsdfec_dev *xsdfec;
+	struct device *dev;
+	struct resource *res;
+	int err;
+
+	xsdfec = devm_kzalloc(&pdev->dev, sizeof(*xsdfec), GFP_KERNEL);
+	if (!xsdfec)
+		return -ENOMEM;
+
+	xsdfec->dev = &pdev->dev;
+	spin_lock_init(&xsdfec->error_data_lock);
+
+	err = xsdfec_clk_init(pdev, &xsdfec->clks);
+	if (err)
+		return err;
+
+	dev = xsdfec->dev;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	xsdfec->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(xsdfec->regs)) {
+		err = PTR_ERR(xsdfec->regs);
+		goto err_xsdfec_dev;
+	}
+
+	/* Save driver private data */
+	platform_set_drvdata(pdev, xsdfec);
+
+	mutex_lock(&dev_idr_lock);
+	err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
+	mutex_unlock(&dev_idr_lock);
+	if (err < 0)
+		goto err_xsdfec_dev;
+	xsdfec->dev_id = err;
+
+	snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
+	xsdfec->miscdev.minor = MISC_DYNAMIC_MINOR;
+	xsdfec->miscdev.name = xsdfec->dev_name;
+	xsdfec->miscdev.fops = &xsdfec_fops;
+	xsdfec->miscdev.parent = dev;
+	err = misc_register(&xsdfec->miscdev);
+	if (err) {
+		dev_err(dev, "error:%d. Unable to register device", err);
+		goto err_xsdfec_idr;
+	}
+	return 0;
+
+err_xsdfec_idr:
+	xsdfec_idr_remove(xsdfec);
+err_xsdfec_dev:
+	xsdfec_disable_all_clks(&xsdfec->clks);
+	return err;
+}
+
+static int xsdfec_remove(struct platform_device *pdev)
+{
+	struct xsdfec_dev *xsdfec;
+
+	xsdfec = platform_get_drvdata(pdev);
+	misc_deregister(&xsdfec->miscdev);
+	xsdfec_idr_remove(xsdfec);
+	xsdfec_disable_all_clks(&xsdfec->clks);
+	return 0;
+}
+
+static const struct of_device_id xsdfec_of_match[] = {
+	{
+		.compatible = "xlnx,sd-fec-1.1",
+	},
+	{ /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, xsdfec_of_match);
+
+static struct platform_driver xsdfec_driver = {
+	.driver = {
+		.name = "xilinx-sdfec",
+		.of_match_table = xsdfec_of_match,
+	},
+	.probe = xsdfec_probe,
+	.remove =  xsdfec_remove,
+};
+
+static int __init xsdfec_init(void)
+{
+	int err;
+
+	mutex_init(&dev_idr_lock);
+	idr_init(&dev_idr);
+	err = platform_driver_register(&xsdfec_driver);
+	if (err < 0) {
+		pr_err("%s Unabled to register SDFEC driver", __func__);
+		return err;
+	}
+	return 0;
+}
+
+static void __exit xsdfec_exit(void)
+{
+	platform_driver_unregister(&xsdfec_driver);
+	idr_destroy(&dev_idr);
+}
+
+module_init(xsdfec_init);
+module_exit(xsdfec_exit);
+
+MODULE_AUTHOR("Xilinx, Inc");
+MODULE_DESCRIPTION("Xilinx SD-FEC16 Driver");
+MODULE_LICENSE("GPL");