--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ *
+ * Author: Minda Chen <minda.chen@starfivetech.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/reset.h>
+#include <linux/regmap.h>
+#include <linux/usb/otg.h>
+#include "core.h"
+
+#define USB_STRAP_HOST BIT(17)
+#define USB_STRAP_DEVICE BIT(18)
+#define USB_STRAP_MASK GENMASK(18, 16)
+
+#define USB_SUSPENDM_HOST BIT(19)
+#define USB_SUSPENDM_MASK BIT(19)
+
+#define USB_MISC_CFG_MASK GENMASK(23, 20)
+#define USB_SUSPENDM_BYPS BIT(20)
+#define USB_PLL_EN BIT(22)
+#define USB_REFCLK_MODE BIT(23)
+
+struct cdns_starfive {
+ struct device *dev;
+ struct regmap *stg_syscon;
+ struct reset_control *resets;
+ struct clk_bulk_data *clks;
+ int num_clks;
+ u32 stg_usb_mode;
+};
+
+static void cdns_mode_init(struct platform_device *pdev,
+ struct cdns_starfive *data)
+{
+ enum usb_dr_mode mode;
+
+ regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+ USB_MISC_CFG_MASK,
+ USB_SUSPENDM_BYPS | USB_PLL_EN | USB_REFCLK_MODE);
+
+ /* dr mode setting */
+ mode = usb_get_dr_mode(&pdev->dev);
+
+ switch (mode) {
+ case USB_DR_MODE_HOST:
+ regmap_update_bits(data->stg_syscon,
+ data->stg_usb_mode,
+ USB_STRAP_MASK,
+ USB_STRAP_HOST);
+ regmap_update_bits(data->stg_syscon,
+ data->stg_usb_mode,
+ USB_SUSPENDM_MASK,
+ USB_SUSPENDM_HOST);
+ break;
+
+ case USB_DR_MODE_PERIPHERAL:
+ regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+ USB_STRAP_MASK, USB_STRAP_DEVICE);
+ regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+ USB_SUSPENDM_MASK, 0);
+ break;
+ default:
+ break;
+ }
+}
+
+static int cdns_clk_rst_init(struct cdns_starfive *data)
+{
+ int ret;
+
+ ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "failed to enable clocks\n");
+
+ ret = reset_control_deassert(data->resets);
+ if (ret) {
+ dev_err(data->dev, "failed to reset clocks\n");
+ goto err_clk_init;
+ }
+
+ return ret;
+
+err_clk_init:
+ clk_bulk_disable_unprepare(data->num_clks, data->clks);
+ return ret;
+}
+
+static void cdns_clk_rst_deinit(struct cdns_starfive *data)
+{
+ reset_control_assert(data->resets);
+ clk_bulk_disable_unprepare(data->num_clks, data->clks);
+}
+
+static int cdns_starfive_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cdns_starfive *data;
+ unsigned int args;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->dev = dev;
+
+ data->stg_syscon =
+ syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+ "starfive,stg-syscon", 1, &args);
+
+ if (IS_ERR(data->stg_syscon))
+ return dev_err_probe(dev, PTR_ERR(data->stg_syscon),
+ "Failed to parse starfive,stg-syscon\n");
+
+ data->stg_usb_mode = args;
+
+ data->num_clks = devm_clk_bulk_get_all(data->dev, &data->clks);
+ if (data->num_clks < 0)
+ return dev_err_probe(data->dev, -ENODEV,
+ "Failed to get clocks\n");
+
+ data->resets = devm_reset_control_array_get_exclusive(data->dev);
+ if (IS_ERR(data->resets))
+ return dev_err_probe(data->dev, PTR_ERR(data->resets),
+ "Failed to get resets");
+
+ cdns_mode_init(pdev, data);
+ ret = cdns_clk_rst_init(data);
+ if (ret)
+ return ret;
+
+ ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+ if (ret) {
+ dev_err(dev, "Failed to create children\n");
+ cdns_clk_rst_deinit(data);
+ return ret;
+ }
+
+ device_set_wakeup_capable(dev, true);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ platform_set_drvdata(pdev, data);
+
+ return 0;
+}
+
+static int cdns_starfive_remove_core(struct device *dev, void *c)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int cdns_starfive_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ pm_runtime_get_sync(dev);
+ device_for_each_child(dev, NULL, cdns_starfive_remove_core);
+
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
+ cdns_clk_rst_deinit(data);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int cdns_starfive_runtime_resume(struct device *dev)
+{
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ return clk_bulk_prepare_enable(data->num_clks, data->clks);
+}
+
+static int cdns_starfive_runtime_suspend(struct device *dev)
+{
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ clk_bulk_disable_unprepare(data->num_clks, data->clks);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cdns_starfive_resume(struct device *dev)
+{
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ return cdns_clk_rst_init(data);
+}
+
+static int cdns_starfive_suspend(struct device *dev)
+{
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ cdns_clk_rst_deinit(data);
+
+ return 0;
+}
+#endif
+#endif
+
+static const struct dev_pm_ops cdns_starfive_pm_ops = {
+ SET_RUNTIME_PM_OPS(cdns_starfive_runtime_suspend,
+ cdns_starfive_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(cdns_starfive_suspend, cdns_starfive_resume)
+};
+
+static const struct of_device_id cdns_starfive_of_match[] = {
+ { .compatible = "starfive,jh7110-usb", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_starfive_of_match);
+
+static struct platform_driver cdns_starfive_driver = {
+ .probe = cdns_starfive_probe,
+ .remove = cdns_starfive_remove,
+ .driver = {
+ .name = "cdns3-starfive",
+ .of_match_table = cdns_starfive_of_match,
+ .pm = &cdns_starfive_pm_ops,
+ },
+};
+module_platform_driver(cdns_starfive_driver);
+
+MODULE_ALIAS("platform:cdns3-starfive");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 StarFive Glue Layer");
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