drivers/amlogic/usb/crg/crg.c - manifest_repos/kernel - Git at Google

 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
  * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
  */

 #include <linux/version.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/list.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/of.h>
 #include <linux/acpi.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/of.h>
 #include <linux/usb/otg.h>
 #include <linux/amlogic/usbtype.h>
 #include <linux/clk.h>
 #include <linux/phy/phy.h>
 #include <linux/amlogic/cpu_version.h>

 #define CRG_DEFAULT_AUTOSUSPEND_DELAY	5000 /* ms */
 #define CRG_XHCI_RESOURCES_NUM	2
 #define CRG_GCTL_PRTCAP_HOST	1
 #define CRG_GCTL_PRTCAP_DEVICE	2
 #define CRG_GCTL_PRTCAP_OTG	3
 #define CRG_XHCI_REGS_END		0x7fff

 struct crg {
 	struct device		*dev;

 	struct platform_device	*xhci;
 	struct resource		xhci_resources[CRG_XHCI_RESOURCES_NUM];
 	struct usb_phy		*usb2_phy;
 	struct usb_phy		*usb3_phy;

 	void __iomem		*regs;
 	size_t			regs_size;
 	enum usb_dr_mode	dr_mode;
 	u32			maximum_speed;
 	void			*mem;

 	unsigned		super_speed_support:1;
 	struct clk		*general_clk;
 };

 /* -------------------------------------------------------------------------- */
 void crg_set_mode(struct crg *crg, u32 mode)
 {
 	//TODO
 }

 static int crg_core_soft_reset(struct crg *crg)
 {
 	usb_phy_init(crg->usb2_phy);
 	usb_phy_init(crg->usb3_phy);

 	return 0;
 }

 static void crg_core_exit(struct crg *crg)
 {
 	usb_phy_shutdown(crg->usb2_phy);
 	usb_phy_shutdown(crg->usb3_phy);

 	usb_phy_set_suspend(crg->usb2_phy, 1);
 	usb_phy_set_suspend(crg->usb3_phy, 1);
 }

 static int crg_core_init(struct crg *crg)
 {
 	int			ret;

 	ret = crg_core_soft_reset(crg);
 	if (ret)
 		return ret;

 	usb_phy_set_suspend(crg->usb2_phy, 0);
 	usb_phy_set_suspend(crg->usb3_phy, 0);

 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 		crg_set_mode(crg, CRG_GCTL_PRTCAP_DEVICE);
 		break;
 	case USB_DR_MODE_HOST:
 		crg_set_mode(crg, CRG_GCTL_PRTCAP_HOST);
 		break;
 	case USB_DR_MODE_OTG:
 		crg_set_mode(crg, CRG_GCTL_PRTCAP_OTG);
 		break;
 	default:
 		dev_warn(crg->dev, "Unsupported mode %d\n", crg->dr_mode);
 		break;
 	}

 	return 0;
 }

 static int crg_core_get_phy(struct crg *crg)
 {
 	struct device		*dev = crg->dev;
 	struct device_node	*node = dev->of_node;
 	int ret;

 	if (node) {
 		crg->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
 		crg->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
 	} else {
 		crg->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 		crg->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
 	}

 	if (IS_ERR(crg->usb2_phy)) {
 		ret = PTR_ERR(crg->usb2_phy);
 		if (ret == -ENXIO || ret == -ENODEV)
 			crg->usb2_phy = NULL;
 		else if (ret == -EPROBE_DEFER)
 			return ret;

 		dev_err(dev, "no usb2 phy configured\n");
 		return ret;
 	}

 	if (IS_ERR(crg->usb3_phy)) {
 		ret = PTR_ERR(crg->usb3_phy);
 		if (ret == -ENXIO || ret == -ENODEV)
 			crg->usb3_phy = NULL;
 		else if (ret == -EPROBE_DEFER)
 			return ret;

 		dev_err(dev, "no usb3 phy configured\n");
 		return ret;
 	}

 	crg->super_speed_support = 0;

 	if (crg->usb3_phy)
 		if (crg->usb3_phy->flags == AML_USB3_PHY_ENABLE)
 			crg->super_speed_support = 1;

 	return 0;
 }

 int crg_host_init(struct crg *crg)
 {
 	struct property_entry	props[3];
 	struct platform_device	*xhci;
 	int			ret, irq;
 	struct resource		*res;
 	struct platform_device	*crg_pdev = to_platform_device(crg->dev);
 	int			prop_idx = 0;

 	irq = platform_get_irq_byname(crg_pdev, "host");
 	if (irq == -EPROBE_DEFER)
 		return irq;

 	if (irq <= 0) {
 		irq = platform_get_irq_byname(crg_pdev, "crg_usb3");
 		if (irq == -EPROBE_DEFER)
 			return irq;

 		if (irq <= 0) {
 			irq = platform_get_irq(crg_pdev, 0);
 			if (irq <= 0) {
 				if (irq != -EPROBE_DEFER) {
 					dev_err(crg->dev,
 						"missing host IRQ\n");
 				}
 				if (!irq)
 					irq = -EINVAL;
 				return irq;
 			}
 			res = platform_get_resource(crg_pdev,
 							IORESOURCE_IRQ, 0);

 		} else {
 			res = platform_get_resource_byname(crg_pdev,
 							   IORESOURCE_IRQ,
 							   "crg_usb3");
 		}

 	} else {
 		res = platform_get_resource_byname(crg_pdev, IORESOURCE_IRQ,
 						   "host");
 	}

 	crg->xhci_resources[1].start = irq;
 	crg->xhci_resources[1].end = irq;
 	crg->xhci_resources[1].flags = res->flags;
 	crg->xhci_resources[1].name = res->name;

 	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 	if (!xhci) {
 		dev_err(crg->dev, "couldn't allocate xHCI device\n");
 		return -ENOMEM;
 	}

 	dma_set_coherent_mask(&xhci->dev, crg->dev->coherent_dma_mask);

 	xhci->dev.parent	= crg->dev;
 	xhci->dev.dma_mask	= crg->dev->dma_mask;
 	xhci->dev.dma_parms	= crg->dev->dma_parms;

 	crg->xhci = xhci;

 	ret = platform_device_add_resources(xhci, crg->xhci_resources,
 						CRG_XHCI_RESOURCES_NUM);
 	if (ret) {
 		dev_err(crg->dev, "couldn't add resources to xHCI device\n");
 		goto err1;
 	}

 	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));

 	if (crg->super_speed_support)
 		props[prop_idx++].name = "super_speed_support";

 	props[prop_idx++].name = "xhci-crg-host";

 	if (prop_idx) {
 		ret = platform_device_add_properties(xhci, props);
 		if (ret) {
 			dev_err(crg->dev, "failed to add properties to xHCI\n");
 			goto err1;
 		}
 	}

 	ret = platform_device_add(xhci);
 	if (ret) {
 		dev_err(crg->dev, "failed to register xHCI device\n");
 		goto err1;
 	}

 	return 0;

 err1:
 	platform_device_put(xhci);
 	return ret;
 }

 static int crg_core_init_mode(struct crg *crg)
 {
 	struct device *dev = crg->dev;
 	int ret;

 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 		break;
 	case USB_DR_MODE_HOST:
 		ret = crg_host_init(crg);
 		if (ret) {
 			if (ret != -EPROBE_DEFER)
 				dev_err(dev, "failed to initialize host\n");
 			return ret;
 		}
 		break;
 	default:
 		dev_err(dev, "Unsupported mode of operation %d\n", crg->dr_mode);
 		return -EINVAL;
 	}

 	return 0;
 }

 #define CRG_ALIGN_MASK		(16 - 1)

 static int crg_probe(struct platform_device *pdev)
 {
 	struct device		*dev = &pdev->dev;
 	struct resource		*res;
 	struct crg		*crg;
 	int			ret;
 	void			*mem;

 	mem = devm_kzalloc(dev, sizeof(*crg) + CRG_ALIGN_MASK, GFP_KERNEL);
 	if (!mem)
 		return -ENOMEM;

 	crg = PTR_ALIGN(mem, CRG_ALIGN_MASK + 1);
 	crg->mem = mem;
 	crg->dev = dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "missing memory resource\n");
 		return -ENODEV;
 	}

 	crg->xhci_resources[0].start = res->start;
 	crg->xhci_resources[0].end = crg->xhci_resources[0].start +
 					CRG_XHCI_REGS_END;
 	crg->xhci_resources[0].flags = res->flags;
 	crg->xhci_resources[0].name = res->name;

 	crg->general_clk = devm_clk_get(dev, "crg_general");
 	if (IS_ERR(crg->general_clk)) {
 		ret = PTR_ERR(crg->general_clk);
 		goto err0;
 	} else {
 		clk_prepare_enable(crg->general_clk);
 	}

 	platform_set_drvdata(pdev, crg);

 	ret = crg_core_get_phy(crg);
 	if (ret)
 		goto err0;

 	if (!dev->dma_mask) {
 		dev->dma_mask = dev->parent->dma_mask;
 		dev->dma_parms = dev->parent->dma_parms;
 		dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
 	}

 	pm_runtime_set_active(dev);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, CRG_DEFAULT_AUTOSUSPEND_DELAY);
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0)
 		goto err0;

 	pm_runtime_forbid(dev);

 	ret = crg_core_init(crg);
 	if (ret) {
 		dev_err(dev, "failed to initialize core\n");
 		goto err0;
 	}

 	crg->maximum_speed = USB_SPEED_HIGH;
 	crg->dr_mode = USB_DR_MODE_HOST;

 	/* Check the maximum_speed parameter */
 	switch (crg->maximum_speed) {
 	case USB_SPEED_LOW:
 	case USB_SPEED_FULL:
 	case USB_SPEED_HIGH:
 	case USB_SPEED_SUPER:
 	case USB_SPEED_SUPER_PLUS:
 		break;
 	default:
 		dev_err(dev, "invalid maximum_speed parameter %d\n",
 			crg->maximum_speed);
 		break;
 	}

 	ret = crg_core_init_mode(crg);
 	if (ret)
 		goto err0;

 	pm_runtime_put(dev);

 	return 0;

 err0:
 	return ret;
 }

 void crg_shutdown(struct platform_device *pdev)
 {
 	struct crg     *crg = platform_get_drvdata(pdev);

 	pm_runtime_get_sync(&pdev->dev);

 	crg_core_exit(crg);

 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

 	clk_disable_unprepare(crg->general_clk);
 }

 static int crg_remove(struct platform_device *pdev)
 {
 	struct crg	   *crg = platform_get_drvdata(pdev);

 	pm_runtime_get_sync(&pdev->dev);

 	crg_core_exit(crg);

 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

 	clk_disable_unprepare(crg->general_clk);
 	return 0;
 }

 #ifdef CONFIG_PM
 static int crg_suspend_common(struct crg *crg)
 {
 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 		break;
 	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
 	}

 	crg_core_exit(crg);

 	return 0;
 }

 static int crg_resume_common(struct crg *crg)
 {
 	int		ret;

 	ret = crg_core_init(crg);
 	if (ret)
 		return ret;

 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
 	}

 	return 0;
 }

 static int crg_runtime_checks(struct crg *crg)
 {
 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
 	}

 	return 0;
 }

 static int crg_runtime_suspend(struct device *dev)
 {
 	struct crg     *crg = dev_get_drvdata(dev);
 	int		ret;

 	if (crg_runtime_checks(crg))
 		return -EBUSY;

 	ret = crg_suspend_common(crg);
 	if (ret)
 		return ret;

 	device_init_wakeup(dev, true);

 	return 0;
 }

 static int crg_runtime_resume(struct device *dev)
 {
 	struct crg     *crg = dev_get_drvdata(dev);
 	int		ret;

 	device_init_wakeup(dev, false);

 	ret = crg_resume_common(crg);
 	if (ret)
 		return ret;

 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
 	}

 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put(dev);

 	return 0;
 }

 static int crg_runtime_idle(struct device *dev)
 {
 	struct crg     *crg = dev_get_drvdata(dev);

 	switch (crg->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
 	case USB_DR_MODE_OTG:
 		if (crg_runtime_checks(crg))
 			return -EBUSY;
 		break;
 	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
 	}

 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_autosuspend(dev);

 	return 0;
 }
 #endif /* CONFIG_PM */

 #ifdef CONFIG_PM_SLEEP
 static int crg_suspend(struct device *dev)
 {
 	struct crg	*crg = dev_get_drvdata(dev);
 	int		ret;

 	ret = crg_suspend_common(crg);
 	if (ret)
 		return ret;

 	clk_disable_unprepare(crg->general_clk);

 	pinctrl_pm_select_sleep_state(dev);

 	return 0;
 }

 static int crg_resume(struct device *dev)
 {
 	struct crg	*crg = dev_get_drvdata(dev);
 	int		ret;

 	pinctrl_pm_select_default_state(dev);

 	clk_prepare_enable(crg->general_clk);

 	ret = crg_resume_common(crg);
 	if (ret)
 		return ret;

 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 static const struct dev_pm_ops crg_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(crg_suspend, crg_resume)
 	SET_RUNTIME_PM_OPS(crg_runtime_suspend, crg_runtime_resume,
 			crg_runtime_idle)
 };

 #ifdef CONFIG_OF
 static const struct of_device_id of_crg_match[] = {
 	{
 		.compatible = "amlogic, crg"
 	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, of_crg_match);
 #endif

 static struct platform_driver crg_driver = {
 	.remove		= crg_remove,
 	.shutdown	= crg_shutdown,
 	.driver		= {
 		.name	= "crg",
 		.of_match_table	= of_match_ptr(of_crg_match),
 		.pm	= &crg_dev_pm_ops,
 	},
 };

 /* AMLOGIC corigine driver does not allow module unload */
 static int __init amlogic_crg_init(void)
 {
 	platform_driver_probe(&crg_driver, crg_probe);
 	return 0;
 }
 late_initcall(amlogic_crg_init);

 MODULE_ALIAS("platform:crg");
 MODULE_AUTHOR("yue wang <yue.wang@amlogic.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("corigine USB3 DRD Controller Driver");
	// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
	/*
	* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
	*/

	#include <linux/version.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/interrupt.h>
	#include <linux/ioport.h>
	#include <linux/io.h>
	#include <linux/list.h>
	#include <linux/delay.h>
	#include <linux/dma-mapping.h>
	#include <linux/of.h>
	#include <linux/acpi.h>
	#include <linux/pinctrl/consumer.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>
	#include <linux/usb/of.h>
	#include <linux/usb/otg.h>
	#include <linux/amlogic/usbtype.h>
	#include <linux/clk.h>
	#include <linux/phy/phy.h>
	#include <linux/amlogic/cpu_version.h>

	#define CRG_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */
	#define CRG_XHCI_RESOURCES_NUM 2
	#define CRG_GCTL_PRTCAP_HOST 1
	#define CRG_GCTL_PRTCAP_DEVICE 2
	#define CRG_GCTL_PRTCAP_OTG 3
	#define CRG_XHCI_REGS_END 0x7fff

	struct crg {
	struct device *dev;

	struct platform_device *xhci;
	struct resource xhci_resources[CRG_XHCI_RESOURCES_NUM];
	struct usb_phy *usb2_phy;
	struct usb_phy *usb3_phy;

	void __iomem *regs;
	size_t regs_size;
	enum usb_dr_mode dr_mode;
	u32 maximum_speed;
	void *mem;

	unsigned super_speed_support:1;
	struct clk *general_clk;
	};

	/* -------------------------------------------------------------------------- */
	void crg_set_mode(struct crg *crg, u32 mode)
	{
	//TODO
	}

	static int crg_core_soft_reset(struct crg *crg)
	{
	usb_phy_init(crg->usb2_phy);
	usb_phy_init(crg->usb3_phy);

	return 0;
	}

	static void crg_core_exit(struct crg *crg)
	{
	usb_phy_shutdown(crg->usb2_phy);
	usb_phy_shutdown(crg->usb3_phy);

	usb_phy_set_suspend(crg->usb2_phy, 1);
	usb_phy_set_suspend(crg->usb3_phy, 1);
	}

	static int crg_core_init(struct crg *crg)
	{
	int ret;

	ret = crg_core_soft_reset(crg);
	if (ret)
	return ret;

	usb_phy_set_suspend(crg->usb2_phy, 0);
	usb_phy_set_suspend(crg->usb3_phy, 0);

	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	crg_set_mode(crg, CRG_GCTL_PRTCAP_DEVICE);
	break;
	case USB_DR_MODE_HOST:
	crg_set_mode(crg, CRG_GCTL_PRTCAP_HOST);
	break;
	case USB_DR_MODE_OTG:
	crg_set_mode(crg, CRG_GCTL_PRTCAP_OTG);
	break;
	default:
	dev_warn(crg->dev, "Unsupported mode %d\n", crg->dr_mode);
	break;
	}

	return 0;
	}

	static int crg_core_get_phy(struct crg *crg)
	{
	struct device *dev = crg->dev;
	struct device_node *node = dev->of_node;
	int ret;

	if (node) {
	crg->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
	crg->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
	} else {
	crg->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
	crg->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
	}

	if (IS_ERR(crg->usb2_phy)) {
	ret = PTR_ERR(crg->usb2_phy);
	if (ret == -ENXIO \|\| ret == -ENODEV)
	crg->usb2_phy = NULL;
	else if (ret == -EPROBE_DEFER)
	return ret;

	dev_err(dev, "no usb2 phy configured\n");
	return ret;
	}

	if (IS_ERR(crg->usb3_phy)) {
	ret = PTR_ERR(crg->usb3_phy);
	if (ret == -ENXIO \|\| ret == -ENODEV)
	crg->usb3_phy = NULL;
	else if (ret == -EPROBE_DEFER)
	return ret;

	dev_err(dev, "no usb3 phy configured\n");
	return ret;
	}

	crg->super_speed_support = 0;

	if (crg->usb3_phy)
	if (crg->usb3_phy->flags == AML_USB3_PHY_ENABLE)
	crg->super_speed_support = 1;

	return 0;
	}

	int crg_host_init(struct crg *crg)
	{
	struct property_entry props[3];
	struct platform_device *xhci;
	int ret, irq;
	struct resource *res;
	struct platform_device *crg_pdev = to_platform_device(crg->dev);
	int prop_idx = 0;

	irq = platform_get_irq_byname(crg_pdev, "host");
	if (irq == -EPROBE_DEFER)
	return irq;

	if (irq <= 0) {
	irq = platform_get_irq_byname(crg_pdev, "crg_usb3");
	if (irq == -EPROBE_DEFER)
	return irq;

	if (irq <= 0) {
	irq = platform_get_irq(crg_pdev, 0);
	if (irq <= 0) {
	if (irq != -EPROBE_DEFER) {
	dev_err(crg->dev,
	"missing host IRQ\n");
	}
	if (!irq)
	irq = -EINVAL;
	return irq;
	}
	res = platform_get_resource(crg_pdev,
	IORESOURCE_IRQ, 0);

	} else {
	res = platform_get_resource_byname(crg_pdev,
	IORESOURCE_IRQ,
	"crg_usb3");
	}

	} else {
	res = platform_get_resource_byname(crg_pdev, IORESOURCE_IRQ,
	"host");
	}

	crg->xhci_resources[1].start = irq;
	crg->xhci_resources[1].end = irq;
	crg->xhci_resources[1].flags = res->flags;
	crg->xhci_resources[1].name = res->name;

	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
	if (!xhci) {
	dev_err(crg->dev, "couldn't allocate xHCI device\n");
	return -ENOMEM;
	}

	dma_set_coherent_mask(&xhci->dev, crg->dev->coherent_dma_mask);

	xhci->dev.parent = crg->dev;
	xhci->dev.dma_mask = crg->dev->dma_mask;
	xhci->dev.dma_parms = crg->dev->dma_parms;

	crg->xhci = xhci;

	ret = platform_device_add_resources(xhci, crg->xhci_resources,
	CRG_XHCI_RESOURCES_NUM);
	if (ret) {
	dev_err(crg->dev, "couldn't add resources to xHCI device\n");
	goto err1;
	}

	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));

	if (crg->super_speed_support)
	props[prop_idx++].name = "super_speed_support";

	props[prop_idx++].name = "xhci-crg-host";

	if (prop_idx) {
	ret = platform_device_add_properties(xhci, props);
	if (ret) {
	dev_err(crg->dev, "failed to add properties to xHCI\n");
	goto err1;
	}
	}

	ret = platform_device_add(xhci);
	if (ret) {
	dev_err(crg->dev, "failed to register xHCI device\n");
	goto err1;
	}

	return 0;

	err1:
	platform_device_put(xhci);
	return ret;
	}

	static int crg_core_init_mode(struct crg *crg)
	{
	struct device *dev = crg->dev;
	int ret;

	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	break;
	case USB_DR_MODE_HOST:
	ret = crg_host_init(crg);
	if (ret) {
	if (ret != -EPROBE_DEFER)
	dev_err(dev, "failed to initialize host\n");
	return ret;
	}
	break;
	default:
	dev_err(dev, "Unsupported mode of operation %d\n", crg->dr_mode);
	return -EINVAL;
	}

	return 0;
	}

	#define CRG_ALIGN_MASK (16 - 1)

	static int crg_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct crg *crg;
	int ret;
	void *mem;

	mem = devm_kzalloc(dev, sizeof(*crg) + CRG_ALIGN_MASK, GFP_KERNEL);
	if (!mem)
	return -ENOMEM;

	crg = PTR_ALIGN(mem, CRG_ALIGN_MASK + 1);
	crg->mem = mem;
	crg->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(dev, "missing memory resource\n");
	return -ENODEV;
	}

	crg->xhci_resources[0].start = res->start;
	crg->xhci_resources[0].end = crg->xhci_resources[0].start +
	CRG_XHCI_REGS_END;
	crg->xhci_resources[0].flags = res->flags;
	crg->xhci_resources[0].name = res->name;

	crg->general_clk = devm_clk_get(dev, "crg_general");
	if (IS_ERR(crg->general_clk)) {
	ret = PTR_ERR(crg->general_clk);
	goto err0;
	} else {
	clk_prepare_enable(crg->general_clk);
	}

	platform_set_drvdata(pdev, crg);

	ret = crg_core_get_phy(crg);
	if (ret)
	goto err0;

	if (!dev->dma_mask) {
	dev->dma_mask = dev->parent->dma_mask;
	dev->dma_parms = dev->parent->dma_parms;
	dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
	}

	pm_runtime_set_active(dev);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, CRG_DEFAULT_AUTOSUSPEND_DELAY);
	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0)
	goto err0;

	pm_runtime_forbid(dev);

	ret = crg_core_init(crg);
	if (ret) {
	dev_err(dev, "failed to initialize core\n");
	goto err0;
	}

	crg->maximum_speed = USB_SPEED_HIGH;
	crg->dr_mode = USB_DR_MODE_HOST;

	/* Check the maximum_speed parameter */
	switch (crg->maximum_speed) {
	case USB_SPEED_LOW:
	case USB_SPEED_FULL:
	case USB_SPEED_HIGH:
	case USB_SPEED_SUPER:
	case USB_SPEED_SUPER_PLUS:
	break;
	default:
	dev_err(dev, "invalid maximum_speed parameter %d\n",
	crg->maximum_speed);
	break;
	}

	ret = crg_core_init_mode(crg);
	if (ret)
	goto err0;

	pm_runtime_put(dev);

	return 0;

	err0:
	return ret;
	}

	void crg_shutdown(struct platform_device *pdev)
	{
	struct crg *crg = platform_get_drvdata(pdev);

	pm_runtime_get_sync(&pdev->dev);

	crg_core_exit(crg);

	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_allow(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(crg->general_clk);
	}

	static int crg_remove(struct platform_device *pdev)
	{
	struct crg *crg = platform_get_drvdata(pdev);

	pm_runtime_get_sync(&pdev->dev);

	crg_core_exit(crg);

	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_allow(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(crg->general_clk);
	return 0;
	}

	#ifdef CONFIG_PM
	static int crg_suspend_common(struct crg *crg)
	{
	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	break;
	case USB_DR_MODE_HOST:
	default:
	/* do nothing */
	break;
	}

	crg_core_exit(crg);

	return 0;
	}

	static int crg_resume_common(struct crg *crg)
	{
	int ret;

	ret = crg_core_init(crg);
	if (ret)
	return ret;

	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	case USB_DR_MODE_HOST:
	default:
	/* do nothing */
	break;
	}

	return 0;
	}

	static int crg_runtime_checks(struct crg *crg)
	{
	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	case USB_DR_MODE_HOST:
	default:
	/* do nothing */
	break;
	}

	return 0;
	}

	static int crg_runtime_suspend(struct device *dev)
	{
	struct crg *crg = dev_get_drvdata(dev);
	int ret;

	if (crg_runtime_checks(crg))
	return -EBUSY;

	ret = crg_suspend_common(crg);
	if (ret)
	return ret;

	device_init_wakeup(dev, true);

	return 0;
	}

	static int crg_runtime_resume(struct device *dev)
	{
	struct crg *crg = dev_get_drvdata(dev);
	int ret;

	device_init_wakeup(dev, false);

	ret = crg_resume_common(crg);
	if (ret)
	return ret;

	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	case USB_DR_MODE_HOST:
	default:
	/* do nothing */
	break;
	}

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put(dev);

	return 0;
	}

	static int crg_runtime_idle(struct device *dev)
	{
	struct crg *crg = dev_get_drvdata(dev);

	switch (crg->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	if (crg_runtime_checks(crg))
	return -EBUSY;
	break;
	case USB_DR_MODE_HOST:
	default:
	/* do nothing */
	break;
	}

	pm_runtime_mark_last_busy(dev);
	pm_runtime_autosuspend(dev);

	return 0;
	}
	#endif /* CONFIG_PM */

	#ifdef CONFIG_PM_SLEEP
	static int crg_suspend(struct device *dev)
	{
	struct crg *crg = dev_get_drvdata(dev);
	int ret;

	ret = crg_suspend_common(crg);
	if (ret)
	return ret;

	clk_disable_unprepare(crg->general_clk);

	pinctrl_pm_select_sleep_state(dev);

	return 0;
	}

	static int crg_resume(struct device *dev)
	{
	struct crg *crg = dev_get_drvdata(dev);
	int ret;

	pinctrl_pm_select_default_state(dev);

	clk_prepare_enable(crg->general_clk);

	ret = crg_resume_common(crg);
	if (ret)
	return ret;

	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	static const struct dev_pm_ops crg_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(crg_suspend, crg_resume)
	SET_RUNTIME_PM_OPS(crg_runtime_suspend, crg_runtime_resume,
	crg_runtime_idle)
	};

	#ifdef CONFIG_OF
	static const struct of_device_id of_crg_match[] = {
	{
	.compatible = "amlogic, crg"
	},
	{ },
	};
	MODULE_DEVICE_TABLE(of, of_crg_match);
	#endif

	static struct platform_driver crg_driver = {
	.remove = crg_remove,
	.shutdown = crg_shutdown,
	.driver = {
	.name = "crg",
	.of_match_table = of_match_ptr(of_crg_match),
	.pm = &crg_dev_pm_ops,
	},
	};

	/* AMLOGIC corigine driver does not allow module unload */
	static int __init amlogic_crg_init(void)
	{
	platform_driver_probe(&crg_driver, crg_probe);
	return 0;
	}
	late_initcall(amlogic_crg_init);

	MODULE_ALIAS("platform:crg");
	MODULE_AUTHOR("yue wang <yue.wang@amlogic.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("corigine USB3 DRD Controller Driver");