drivers/usb/dwc3/dwc3-generic.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Generic DWC3 Glue layer
  *
  * Copyright (C) 2016 - 2018 Xilinx, Inc.
  *
  * Based on dwc3-omap.c.
  */

 #include <common.h>
 #include <cpu_func.h>
 #include <log.h>
 #include <dm.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dwc3-uboot.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <malloc.h>
 #include <usb.h>
 #include "core.h"
 #include "gadget.h"
 #include <reset.h>
 #include <clk.h>
 #include <usb/xhci.h>

 struct dwc3_glue_data {
 	struct clk_bulk		clks;
 	struct reset_ctl_bulk	resets;
 	fdt_addr_t regs;
 };

 struct dwc3_generic_plat {
 	fdt_addr_t base;
 	u32 maximum_speed;
 	enum usb_dr_mode dr_mode;
 };

 struct dwc3_generic_priv {
 	void *base;
 	struct dwc3 dwc3;
 	struct phy_bulk phys;
 };

 struct dwc3_generic_host_priv {
 	struct xhci_ctrl xhci_ctrl;
 	struct dwc3_generic_priv gen_priv;
 };

 static int dwc3_generic_probe(struct udevice *dev,
 			      struct dwc3_generic_priv *priv)
 {
 	int rc;
 	struct dwc3_generic_plat *plat = dev_get_plat(dev);
 	struct dwc3 *dwc3 = &priv->dwc3;
 	struct dwc3_glue_data *glue = dev_get_plat(dev->parent);

 	dwc3->dev = dev;
 	dwc3->maximum_speed = plat->maximum_speed;
 	dwc3->dr_mode = plat->dr_mode;
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 	dwc3_of_parse(dwc3);
 #endif

 	/*
 	 * It must hold whole USB3.0 OTG controller in resetting to hold pipe
 	 * power state in P2 before initializing TypeC PHY on RK3399 platform.
 	 */
 	if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3")) {
 		reset_assert_bulk(&glue->resets);
 		udelay(1);
 	}

 	rc = dwc3_setup_phy(dev, &priv->phys);
 	if (rc && rc != -ENOTSUPP)
 		return rc;

 	if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3"))
 		reset_deassert_bulk(&glue->resets);

 	priv->base = map_physmem(plat->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
 	dwc3->regs = priv->base + DWC3_GLOBALS_REGS_START;


 	rc =  dwc3_init(dwc3);
 	if (rc) {
 		unmap_physmem(priv->base, MAP_NOCACHE);
 		return rc;
 	}

 	return 0;
 }

 static int dwc3_generic_remove(struct udevice *dev,
 			       struct dwc3_generic_priv *priv)
 {
 	struct dwc3 *dwc3 = &priv->dwc3;

 	dwc3_remove(dwc3);
 	dwc3_shutdown_phy(dev, &priv->phys);
 	unmap_physmem(dwc3->regs, MAP_NOCACHE);

 	return 0;
 }

 static int dwc3_generic_of_to_plat(struct udevice *dev)
 {
 	struct dwc3_generic_plat *plat = dev_get_plat(dev);
 	ofnode node = dev_ofnode(dev);

 	plat->base = dev_read_addr(dev);

 	plat->maximum_speed = usb_get_maximum_speed(node);
 	if (plat->maximum_speed == USB_SPEED_UNKNOWN) {
 		pr_info("No USB maximum speed specified. Using super speed\n");
 		plat->maximum_speed = USB_SPEED_SUPER;
 	}

 	plat->dr_mode = usb_get_dr_mode(node);
 	if (plat->dr_mode == USB_DR_MODE_UNKNOWN) {
 		pr_err("Invalid usb mode setup\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 {
 	struct dwc3_generic_priv *priv = dev_get_priv(dev);
 	struct dwc3 *dwc3 = &priv->dwc3;

 	dwc3_gadget_uboot_handle_interrupt(dwc3);

 	return 0;
 }

 static int dwc3_generic_peripheral_probe(struct udevice *dev)
 {
 	struct dwc3_generic_priv *priv = dev_get_priv(dev);

 	return dwc3_generic_probe(dev, priv);
 }

 static int dwc3_generic_peripheral_remove(struct udevice *dev)
 {
 	struct dwc3_generic_priv *priv = dev_get_priv(dev);

 	return dwc3_generic_remove(dev, priv);
 }

 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 	.name	= "dwc3-generic-peripheral",
 	.id	= UCLASS_USB_GADGET_GENERIC,
 	.of_to_plat = dwc3_generic_of_to_plat,
 	.probe = dwc3_generic_peripheral_probe,
 	.remove = dwc3_generic_peripheral_remove,
 	.priv_auto	= sizeof(struct dwc3_generic_priv),
 	.plat_auto	= sizeof(struct dwc3_generic_plat),
 };
 #endif

 #if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
 static int dwc3_generic_host_probe(struct udevice *dev)
 {
 	struct xhci_hcor *hcor;
 	struct xhci_hccr *hccr;
 	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
 	int rc;

 	rc = dwc3_generic_probe(dev, &priv->gen_priv);
 	if (rc)
 		return rc;

 	hccr = (struct xhci_hccr *)priv->gen_priv.base;
 	hcor = (struct xhci_hcor *)(priv->gen_priv.base +
 			HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));

 	return xhci_register(dev, hccr, hcor);
 }

 static int dwc3_generic_host_remove(struct udevice *dev)
 {
 	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
 	int rc;

 	rc = xhci_deregister(dev);
 	if (rc)
 		return rc;

 	return dwc3_generic_remove(dev, &priv->gen_priv);
 }

 U_BOOT_DRIVER(dwc3_generic_host) = {
 	.name	= "dwc3-generic-host",
 	.id	= UCLASS_USB,
 	.of_to_plat = dwc3_generic_of_to_plat,
 	.probe = dwc3_generic_host_probe,
 	.remove = dwc3_generic_host_remove,
 	.priv_auto	= sizeof(struct dwc3_generic_host_priv),
 	.plat_auto	= sizeof(struct dwc3_generic_plat),
 	.ops = &xhci_usb_ops,
 	.flags = DM_FLAG_ALLOC_PRIV_DMA,
 };
 #endif

 struct dwc3_glue_ops {
 	void (*select_dr_mode)(struct udevice *dev, int index,
 			       enum usb_dr_mode mode);
 };

 void dwc3_ti_select_dr_mode(struct udevice *dev, int index,
 			    enum usb_dr_mode mode)
 {
 #define USBOTGSS_UTMI_OTG_STATUS		0x0084
 #define USBOTGSS_UTMI_OTG_OFFSET		0x0480

 /* UTMI_OTG_STATUS REGISTER */
 #define USBOTGSS_UTMI_OTG_STATUS_SW_MODE	BIT(31)
 #define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT	BIT(9)
 #define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE BIT(8)
 #define USBOTGSS_UTMI_OTG_STATUS_IDDIG		BIT(4)
 #define USBOTGSS_UTMI_OTG_STATUS_SESSEND	BIT(3)
 #define USBOTGSS_UTMI_OTG_STATUS_SESSVALID	BIT(2)
 #define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID	BIT(1)
 enum dwc3_omap_utmi_mode {
 	DWC3_OMAP_UTMI_MODE_UNKNOWN = 0,
 	DWC3_OMAP_UTMI_MODE_HW,
 	DWC3_OMAP_UTMI_MODE_SW,
 };

 	u32 use_id_pin;
 	u32 host_mode;
 	u32 reg;
 	u32 utmi_mode;
 	u32 utmi_status_offset = USBOTGSS_UTMI_OTG_STATUS;

 	struct dwc3_glue_data *glue = dev_get_plat(dev);
 	void *base = map_physmem(glue->regs, 0x10000, MAP_NOCACHE);

 	if (device_is_compatible(dev, "ti,am437x-dwc3"))
 		utmi_status_offset += USBOTGSS_UTMI_OTG_OFFSET;

 	utmi_mode = dev_read_u32_default(dev, "utmi-mode",
 					 DWC3_OMAP_UTMI_MODE_UNKNOWN);
 	if (utmi_mode != DWC3_OMAP_UTMI_MODE_HW) {
 		debug("%s: OTG is not supported. defaulting to PERIPHERAL\n",
 		      dev->name);
 		mode = USB_DR_MODE_PERIPHERAL;
 	}

 	switch (mode)  {
 	case USB_DR_MODE_PERIPHERAL:
 		use_id_pin = 0;
 		host_mode = 0;
 		break;
 	case USB_DR_MODE_HOST:
 		use_id_pin = 0;
 		host_mode = 1;
 		break;
 	case USB_DR_MODE_OTG:
 	default:
 		use_id_pin = 1;
 		host_mode = 0;
 		break;
 	}

 	reg = readl(base + utmi_status_offset);

 	reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SW_MODE);
 	if (!use_id_pin)
 		reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;

 	writel(reg, base + utmi_status_offset);

 	reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSEND |
 		USBOTGSS_UTMI_OTG_STATUS_VBUSVALID |
 		USBOTGSS_UTMI_OTG_STATUS_IDDIG);

 	reg |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID |
 		USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;

 	if (!host_mode)
 		reg |= USBOTGSS_UTMI_OTG_STATUS_IDDIG |
 			USBOTGSS_UTMI_OTG_STATUS_VBUSVALID;

 	writel(reg, base + utmi_status_offset);

 	unmap_physmem(base, MAP_NOCACHE);
 }

 struct dwc3_glue_ops ti_ops = {
 	.select_dr_mode = dwc3_ti_select_dr_mode,
 };

 static int dwc3_glue_bind(struct udevice *parent)
 {
 	ofnode node;
 	int ret;

 	ofnode_for_each_subnode(node, dev_ofnode(parent)) {
 		const char *name = ofnode_get_name(node);
 		enum usb_dr_mode dr_mode;
 		struct udevice *dev;
 		const char *driver = NULL;

 		debug("%s: subnode name: %s\n", __func__, name);

 		dr_mode = usb_get_dr_mode(node);

 		switch (dr_mode) {
 		case USB_DR_MODE_PERIPHERAL:
 		case USB_DR_MODE_OTG:
 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 			driver = "dwc3-generic-peripheral";
 #endif
 			break;
 #if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
 		case USB_DR_MODE_HOST:
 			debug("%s: dr_mode: HOST\n", __func__);
 			driver = "dwc3-generic-host";
 			break;
 #endif
 		default:
 			debug("%s: unsupported dr_mode\n", __func__);
 			return -ENODEV;
 		};

 		if (!driver)
 			continue;

 		ret = device_bind_driver_to_node(parent, driver, name,
 						 node, &dev);
 		if (ret) {
 			debug("%s: not able to bind usb device mode\n",
 			      __func__);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int dwc3_glue_reset_init(struct udevice *dev,
 				struct dwc3_glue_data *glue)
 {
 	int ret;

 	ret = reset_get_bulk(dev, &glue->resets);
 	if (ret == -ENOTSUPP || ret == -ENOENT)
 		return 0;
 	else if (ret)
 		return ret;

 	ret = reset_deassert_bulk(&glue->resets);
 	if (ret) {
 		reset_release_bulk(&glue->resets);
 		return ret;
 	}

 	return 0;
 }

 static int dwc3_glue_clk_init(struct udevice *dev,
 			      struct dwc3_glue_data *glue)
 {
 	int ret;

 	ret = clk_get_bulk(dev, &glue->clks);
 	if (ret == -ENOSYS || ret == -ENOENT)
 		return 0;
 	if (ret)
 		return ret;

 #if CONFIG_IS_ENABLED(CLK)
 	ret = clk_enable_bulk(&glue->clks);
 	if (ret) {
 		clk_release_bulk(&glue->clks);
 		return ret;
 	}
 #endif

 	return 0;
 }

 static int dwc3_glue_probe(struct udevice *dev)
 {
 	struct dwc3_glue_ops *ops = (struct dwc3_glue_ops *)dev_get_driver_data(dev);
 	struct dwc3_glue_data *glue = dev_get_plat(dev);
 	struct udevice *child = NULL;
 	int index = 0;
 	int ret;

 	glue->regs = dev_read_addr(dev);

 	ret = dwc3_glue_clk_init(dev, glue);
 	if (ret)
 		return ret;

 	ret = dwc3_glue_reset_init(dev, glue);
 	if (ret)
 		return ret;

 	ret = device_find_first_child(dev, &child);
 	if (ret)
 		return ret;

 	if (glue->resets.count == 0) {
 		ret = dwc3_glue_reset_init(child, glue);
 		if (ret)
 			return ret;
 	}

 	while (child) {
 		enum usb_dr_mode dr_mode;

 		dr_mode = usb_get_dr_mode(dev_ofnode(child));
 		device_find_next_child(&child);
 		if (ops && ops->select_dr_mode)
 			ops->select_dr_mode(dev, index, dr_mode);
 		index++;
 	}

 	return 0;
 }

 static int dwc3_glue_remove(struct udevice *dev)
 {
 	struct dwc3_glue_data *glue = dev_get_plat(dev);

 	reset_release_bulk(&glue->resets);

 	clk_release_bulk(&glue->clks);

 	return 0;
 }

 static const struct udevice_id dwc3_glue_ids[] = {
 	{ .compatible = "xlnx,zynqmp-dwc3" },
 	{ .compatible = "xlnx,versal-dwc3" },
 	{ .compatible = "ti,keystone-dwc3"},
 	{ .compatible = "ti,dwc3", .data = (ulong)&ti_ops },
 	{ .compatible = "ti,am437x-dwc3", .data = (ulong)&ti_ops },
 	{ .compatible = "ti,am654-dwc3" },
 	{ .compatible = "rockchip,rk3328-dwc3" },
 	{ .compatible = "rockchip,rk3399-dwc3" },
 	{ .compatible = "qcom,dwc3" },
 	{ }
 };

 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 	.name	= "dwc3-generic-wrapper",
 	.id	= UCLASS_NOP,
 	.of_match = dwc3_glue_ids,
 	.bind = dwc3_glue_bind,
 	.probe = dwc3_glue_probe,
 	.remove = dwc3_glue_remove,
 	.plat_auto	= sizeof(struct dwc3_glue_data),

 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Generic DWC3 Glue layer
	*
	* Copyright (C) 2016 - 2018 Xilinx, Inc.
	*
	* Based on dwc3-omap.c.
	*/

	#include <common.h>
	#include <cpu_func.h>
	#include <log.h>
	#include <dm.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dwc3-uboot.h>
	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>
	#include <malloc.h>
	#include <usb.h>
	#include "core.h"
	#include "gadget.h"
	#include <reset.h>
	#include <clk.h>
	#include <usb/xhci.h>

	struct dwc3_glue_data {
	struct clk_bulk clks;
	struct reset_ctl_bulk resets;
	fdt_addr_t regs;
	};

	struct dwc3_generic_plat {
	fdt_addr_t base;
	u32 maximum_speed;
	enum usb_dr_mode dr_mode;
	};

	struct dwc3_generic_priv {
	void *base;
	struct dwc3 dwc3;
	struct phy_bulk phys;
	};

	struct dwc3_generic_host_priv {
	struct xhci_ctrl xhci_ctrl;
	struct dwc3_generic_priv gen_priv;
	};

	static int dwc3_generic_probe(struct udevice *dev,
	struct dwc3_generic_priv *priv)
	{
	int rc;
	struct dwc3_generic_plat *plat = dev_get_plat(dev);
	struct dwc3 *dwc3 = &priv->dwc3;
	struct dwc3_glue_data *glue = dev_get_plat(dev->parent);

	dwc3->dev = dev;
	dwc3->maximum_speed = plat->maximum_speed;
	dwc3->dr_mode = plat->dr_mode;
	#if CONFIG_IS_ENABLED(OF_CONTROL)
	dwc3_of_parse(dwc3);
	#endif

	/*
	* It must hold whole USB3.0 OTG controller in resetting to hold pipe
	* power state in P2 before initializing TypeC PHY on RK3399 platform.
	*/
	if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3")) {
	reset_assert_bulk(&glue->resets);
	udelay(1);
	}

	rc = dwc3_setup_phy(dev, &priv->phys);
	if (rc && rc != -ENOTSUPP)
	return rc;

	if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3"))
	reset_deassert_bulk(&glue->resets);

	priv->base = map_physmem(plat->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
	dwc3->regs = priv->base + DWC3_GLOBALS_REGS_START;


	rc = dwc3_init(dwc3);
	if (rc) {
	unmap_physmem(priv->base, MAP_NOCACHE);
	return rc;
	}

	return 0;
	}

	static int dwc3_generic_remove(struct udevice *dev,
	struct dwc3_generic_priv *priv)
	{
	struct dwc3 *dwc3 = &priv->dwc3;

	dwc3_remove(dwc3);
	dwc3_shutdown_phy(dev, &priv->phys);
	unmap_physmem(dwc3->regs, MAP_NOCACHE);

	return 0;
	}

	static int dwc3_generic_of_to_plat(struct udevice *dev)
	{
	struct dwc3_generic_plat *plat = dev_get_plat(dev);
	ofnode node = dev_ofnode(dev);

	plat->base = dev_read_addr(dev);

	plat->maximum_speed = usb_get_maximum_speed(node);
	if (plat->maximum_speed == USB_SPEED_UNKNOWN) {
	pr_info("No USB maximum speed specified. Using super speed\n");
	plat->maximum_speed = USB_SPEED_SUPER;
	}

	plat->dr_mode = usb_get_dr_mode(node);
	if (plat->dr_mode == USB_DR_MODE_UNKNOWN) {
	pr_err("Invalid usb mode setup\n");
	return -ENODEV;
	}

	return 0;
	}

	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	int dm_usb_gadget_handle_interrupts(struct udevice *dev)
	{
	struct dwc3_generic_priv *priv = dev_get_priv(dev);
	struct dwc3 *dwc3 = &priv->dwc3;

	dwc3_gadget_uboot_handle_interrupt(dwc3);

	return 0;
	}

	static int dwc3_generic_peripheral_probe(struct udevice *dev)
	{
	struct dwc3_generic_priv *priv = dev_get_priv(dev);

	return dwc3_generic_probe(dev, priv);
	}

	static int dwc3_generic_peripheral_remove(struct udevice *dev)
	{
	struct dwc3_generic_priv *priv = dev_get_priv(dev);

	return dwc3_generic_remove(dev, priv);
	}

	U_BOOT_DRIVER(dwc3_generic_peripheral) = {
	.name = "dwc3-generic-peripheral",
	.id = UCLASS_USB_GADGET_GENERIC,
	.of_to_plat = dwc3_generic_of_to_plat,
	.probe = dwc3_generic_peripheral_probe,
	.remove = dwc3_generic_peripheral_remove,
	.priv_auto = sizeof(struct dwc3_generic_priv),
	.plat_auto = sizeof(struct dwc3_generic_plat),
	};
	#endif

	#if defined(CONFIG_SPL_USB_HOST_SUPPORT) \|\| !defined(CONFIG_SPL_BUILD)
	static int dwc3_generic_host_probe(struct udevice *dev)
	{
	struct xhci_hcor *hcor;
	struct xhci_hccr *hccr;
	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
	int rc;

	rc = dwc3_generic_probe(dev, &priv->gen_priv);
	if (rc)
	return rc;

	hccr = (struct xhci_hccr *)priv->gen_priv.base;
	hcor = (struct xhci_hcor *)(priv->gen_priv.base +
	HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));

	return xhci_register(dev, hccr, hcor);
	}

	static int dwc3_generic_host_remove(struct udevice *dev)
	{
	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
	int rc;

	rc = xhci_deregister(dev);
	if (rc)
	return rc;

	return dwc3_generic_remove(dev, &priv->gen_priv);
	}

	U_BOOT_DRIVER(dwc3_generic_host) = {
	.name = "dwc3-generic-host",
	.id = UCLASS_USB,
	.of_to_plat = dwc3_generic_of_to_plat,
	.probe = dwc3_generic_host_probe,
	.remove = dwc3_generic_host_remove,
	.priv_auto = sizeof(struct dwc3_generic_host_priv),
	.plat_auto = sizeof(struct dwc3_generic_plat),
	.ops = &xhci_usb_ops,
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
	};
	#endif

	struct dwc3_glue_ops {
	void (select_dr_mode)(struct udevice dev, int index,
	enum usb_dr_mode mode);
	};

	void dwc3_ti_select_dr_mode(struct udevice *dev, int index,
	enum usb_dr_mode mode)
	{
	#define USBOTGSS_UTMI_OTG_STATUS 0x0084
	#define USBOTGSS_UTMI_OTG_OFFSET 0x0480

	/* UTMI_OTG_STATUS REGISTER */
	#define USBOTGSS_UTMI_OTG_STATUS_SW_MODE BIT(31)
	#define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT BIT(9)
	#define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE BIT(8)
	#define USBOTGSS_UTMI_OTG_STATUS_IDDIG BIT(4)
	#define USBOTGSS_UTMI_OTG_STATUS_SESSEND BIT(3)
	#define USBOTGSS_UTMI_OTG_STATUS_SESSVALID BIT(2)
	#define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID BIT(1)
	enum dwc3_omap_utmi_mode {
	DWC3_OMAP_UTMI_MODE_UNKNOWN = 0,
	DWC3_OMAP_UTMI_MODE_HW,
	DWC3_OMAP_UTMI_MODE_SW,
	};

	u32 use_id_pin;
	u32 host_mode;
	u32 reg;
	u32 utmi_mode;
	u32 utmi_status_offset = USBOTGSS_UTMI_OTG_STATUS;

	struct dwc3_glue_data *glue = dev_get_plat(dev);
	void *base = map_physmem(glue->regs, 0x10000, MAP_NOCACHE);

	if (device_is_compatible(dev, "ti,am437x-dwc3"))
	utmi_status_offset += USBOTGSS_UTMI_OTG_OFFSET;

	utmi_mode = dev_read_u32_default(dev, "utmi-mode",
	DWC3_OMAP_UTMI_MODE_UNKNOWN);
	if (utmi_mode != DWC3_OMAP_UTMI_MODE_HW) {
	debug("%s: OTG is not supported. defaulting to PERIPHERAL\n",
	dev->name);
	mode = USB_DR_MODE_PERIPHERAL;
	}

	switch (mode) {
	case USB_DR_MODE_PERIPHERAL:
	use_id_pin = 0;
	host_mode = 0;
	break;
	case USB_DR_MODE_HOST:
	use_id_pin = 0;
	host_mode = 1;
	break;
	case USB_DR_MODE_OTG:
	default:
	use_id_pin = 1;
	host_mode = 0;
	break;
	}

	reg = readl(base + utmi_status_offset);

	reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SW_MODE);
	if (!use_id_pin)
	reg \|= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;

	writel(reg, base + utmi_status_offset);

	reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSEND \|
	USBOTGSS_UTMI_OTG_STATUS_VBUSVALID \|
	USBOTGSS_UTMI_OTG_STATUS_IDDIG);

	reg \|= USBOTGSS_UTMI_OTG_STATUS_SESSVALID \|
	USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;

	if (!host_mode)
	reg \|= USBOTGSS_UTMI_OTG_STATUS_IDDIG \|
	USBOTGSS_UTMI_OTG_STATUS_VBUSVALID;

	writel(reg, base + utmi_status_offset);

	unmap_physmem(base, MAP_NOCACHE);
	}

	struct dwc3_glue_ops ti_ops = {
	.select_dr_mode = dwc3_ti_select_dr_mode,
	};

	static int dwc3_glue_bind(struct udevice *parent)
	{
	ofnode node;
	int ret;

	ofnode_for_each_subnode(node, dev_ofnode(parent)) {
	const char *name = ofnode_get_name(node);
	enum usb_dr_mode dr_mode;
	struct udevice *dev;
	const char *driver = NULL;

	debug("%s: subnode name: %s\n", __func__, name);

	dr_mode = usb_get_dr_mode(node);

	switch (dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	debug("%s: dr_mode: OTG or Peripheral\n", __func__);
	driver = "dwc3-generic-peripheral";
	#endif
	break;
	#if defined(CONFIG_SPL_USB_HOST_SUPPORT) \|\| !defined(CONFIG_SPL_BUILD)
	case USB_DR_MODE_HOST:
	debug("%s: dr_mode: HOST\n", __func__);
	driver = "dwc3-generic-host";
	break;
	#endif
	default:
	debug("%s: unsupported dr_mode\n", __func__);
	return -ENODEV;
	};

	if (!driver)
	continue;

	ret = device_bind_driver_to_node(parent, driver, name,
	node, &dev);
	if (ret) {
	debug("%s: not able to bind usb device mode\n",
	__func__);
	return ret;
	}
	}

	return 0;
	}

	static int dwc3_glue_reset_init(struct udevice *dev,
	struct dwc3_glue_data *glue)
	{
	int ret;

	ret = reset_get_bulk(dev, &glue->resets);
	if (ret == -ENOTSUPP \|\| ret == -ENOENT)
	return 0;
	else if (ret)
	return ret;

	ret = reset_deassert_bulk(&glue->resets);
	if (ret) {
	reset_release_bulk(&glue->resets);
	return ret;
	}

	return 0;
	}

	static int dwc3_glue_clk_init(struct udevice *dev,
	struct dwc3_glue_data *glue)
	{
	int ret;

	ret = clk_get_bulk(dev, &glue->clks);
	if (ret == -ENOSYS \|\| ret == -ENOENT)
	return 0;
	if (ret)
	return ret;

	#if CONFIG_IS_ENABLED(CLK)
	ret = clk_enable_bulk(&glue->clks);
	if (ret) {
	clk_release_bulk(&glue->clks);
	return ret;
	}
	#endif

	return 0;
	}

	static int dwc3_glue_probe(struct udevice *dev)
	{
	struct dwc3_glue_ops ops = (struct dwc3_glue_ops )dev_get_driver_data(dev);
	struct dwc3_glue_data *glue = dev_get_plat(dev);
	struct udevice *child = NULL;
	int index = 0;
	int ret;

	glue->regs = dev_read_addr(dev);

	ret = dwc3_glue_clk_init(dev, glue);
	if (ret)
	return ret;

	ret = dwc3_glue_reset_init(dev, glue);
	if (ret)
	return ret;

	ret = device_find_first_child(dev, &child);
	if (ret)
	return ret;

	if (glue->resets.count == 0) {
	ret = dwc3_glue_reset_init(child, glue);
	if (ret)
	return ret;
	}

	while (child) {
	enum usb_dr_mode dr_mode;

	dr_mode = usb_get_dr_mode(dev_ofnode(child));
	device_find_next_child(&child);
	if (ops && ops->select_dr_mode)
	ops->select_dr_mode(dev, index, dr_mode);
	index++;
	}

	return 0;
	}

	static int dwc3_glue_remove(struct udevice *dev)
	{
	struct dwc3_glue_data *glue = dev_get_plat(dev);

	reset_release_bulk(&glue->resets);

	clk_release_bulk(&glue->clks);

	return 0;
	}

	static const struct udevice_id dwc3_glue_ids[] = {
	{ .compatible = "xlnx,zynqmp-dwc3" },
	{ .compatible = "xlnx,versal-dwc3" },
	{ .compatible = "ti,keystone-dwc3"},
	{ .compatible = "ti,dwc3", .data = (ulong)&ti_ops },
	{ .compatible = "ti,am437x-dwc3", .data = (ulong)&ti_ops },
	{ .compatible = "ti,am654-dwc3" },
	{ .compatible = "rockchip,rk3328-dwc3" },
	{ .compatible = "rockchip,rk3399-dwc3" },
	{ .compatible = "qcom,dwc3" },
	{ }
	};

	U_BOOT_DRIVER(dwc3_generic_wrapper) = {
	.name = "dwc3-generic-wrapper",
	.id = UCLASS_NOP,
	.of_match = dwc3_glue_ids,
	.bind = dwc3_glue_bind,
	.probe = dwc3_glue_probe,
	.remove = dwc3_glue_remove,
	.plat_auto = sizeof(struct dwc3_glue_data),

	};