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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Memory Mapped IO Fixed clock driver
- *
- * Copyright (C) 2018 Cadence Design Systems, Inc.
- *
- * Authors:
- * Jan Kotas <[email protected]>
- */
- #include <linux/clk-provider.h>
- #include <linux/io.h>
- #include <linux/module.h>
- #include <linux/of_address.h>
- #include <linux/platform_device.h>
- static struct clk_hw *fixed_mmio_clk_setup(struct device_node *node)
- {
- struct clk_hw *clk;
- const char *clk_name = node->name;
- void __iomem *base;
- u32 freq;
- int ret;
- base = of_iomap(node, 0);
- if (!base) {
- pr_err("%pOFn: failed to map address\n", node);
- return ERR_PTR(-EIO);
- }
- freq = readl(base);
- iounmap(base);
- of_property_read_string(node, "clock-output-names", &clk_name);
- clk = clk_hw_register_fixed_rate(NULL, clk_name, NULL, 0, freq);
- if (IS_ERR(clk)) {
- pr_err("%pOFn: failed to register fixed rate clock\n", node);
- return clk;
- }
- ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, clk);
- if (ret) {
- pr_err("%pOFn: failed to add clock provider\n", node);
- clk_hw_unregister(clk);
- clk = ERR_PTR(ret);
- }
- return clk;
- }
- static void __init of_fixed_mmio_clk_setup(struct device_node *node)
- {
- fixed_mmio_clk_setup(node);
- }
- CLK_OF_DECLARE(fixed_mmio_clk, "fixed-mmio-clock", of_fixed_mmio_clk_setup);
- /*
- * This is not executed when of_fixed_mmio_clk_setup succeeded.
- */
- static int of_fixed_mmio_clk_probe(struct platform_device *pdev)
- {
- struct clk_hw *clk;
- clk = fixed_mmio_clk_setup(pdev->dev.of_node);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
- platform_set_drvdata(pdev, clk);
- return 0;
- }
- static int of_fixed_mmio_clk_remove(struct platform_device *pdev)
- {
- struct clk_hw *clk = platform_get_drvdata(pdev);
- of_clk_del_provider(pdev->dev.of_node);
- clk_hw_unregister_fixed_rate(clk);
- return 0;
- }
- static const struct of_device_id of_fixed_mmio_clk_ids[] = {
- { .compatible = "fixed-mmio-clock" },
- { }
- };
- MODULE_DEVICE_TABLE(of, of_fixed_mmio_clk_ids);
- static struct platform_driver of_fixed_mmio_clk_driver = {
- .driver = {
- .name = "of_fixed_mmio_clk",
- .of_match_table = of_fixed_mmio_clk_ids,
- },
- .probe = of_fixed_mmio_clk_probe,
- .remove = of_fixed_mmio_clk_remove,
- };
- module_platform_driver(of_fixed_mmio_clk_driver);
- MODULE_AUTHOR("Jan Kotas <[email protected]>");
- MODULE_DESCRIPTION("Memory Mapped IO Fixed clock driver");
- MODULE_LICENSE("GPL v2");
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