usb: cdns3: Add StarFive JH7110 USB driver (bfb46b42) · Commits · github.com / kvm-riscv / linux

MAINTAINERS

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		@@ -20137,6 +20137,12 @@ F: Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
		F: drivers/reset/starfive/reset-starfive-jh71*
		F: include/dt-bindings/reset/starfive?jh71*.h

		STARFIVE JH71X0 USB DRIVERS
		M: Minda Chen <minda.chen@starfivetech.com>
		S: Maintained
		F: Documentation/devicetree/bindings/usb/starfive,jh7110-usb.yaml
		F: drivers/usb/cdns3/cdns3-starfive.c

		STARFIVE JH71XX PMU CONTROLLER DRIVER
		M: Walker Chen <walker.chen@starfivetech.com>
		S: Supported

drivers/usb/cdns3/Kconfig

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		@@ -78,6 +78,17 @@ config USB_CDNS3_IMX

		For example, imx8qm and imx8qxp.

		config USB_CDNS3_STARFIVE
		tristate "Cadence USB3 support on StarFive SoC platforms"
		depends on ARCH_STARFIVE \|\| COMPILE_TEST
		help
		Say 'Y' or 'M' here if you are building for StarFive SoCs
		platforms that contain Cadence USB3 controller core.

		e.g. JH7110.

		If you choose to build this driver as module it will
		be dynamically linked and module will be called cdns3-starfive.ko
		endif

		if USB_CDNS_SUPPORT

drivers/usb/cdns3/Makefile

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		@@ -24,6 +24,7 @@ endif
		obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o
		obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o
		obj-$(CONFIG_USB_CDNS3_IMX) += cdns3-imx.o
		obj-$(CONFIG_USB_CDNS3_STARFIVE) += cdns3-starfive.o

		cdnsp-udc-pci-y := cdnsp-pci.o

drivers/usb/cdns3/cdns3-starfive.c

0 → 100644

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		// 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");