diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 1c1c1d659394..2196265bc783 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -13,7 +13,9 @@ obj-$(CONFIG_USB_DWC3)		+= dwc3/
 obj-$(CONFIG_USB_DWC2)		+= dwc2/
 obj-$(CONFIG_USB_ISP1760)	+= isp1760/
 
+obj-$(CONFIG_USB_CDNS_SUPPORT)	+= cdns3/
 obj-$(CONFIG_USB_CDNS3)		+= cdns3/
+obj-$(CONFIG_USB_CDNSP_PCI)	+= cdns3/
 
 obj-$(CONFIG_USB_MON)		+= mon/
 obj-$(CONFIG_USB_MTU3)		+= mtu3/
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index 58154c0a73ac..d40631cbcfa3 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -1,21 +1,28 @@
-config CDNS_USB_COMMON
-	tristate
+config USB_CDNS_SUPPORT
+	tristate "Cadence USB Support"
+	depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
+	select USB_XHCI_PLATFORM if USB_XHCI_HCD
+	select USB_ROLE_SWITCH
+	help
+	  Say Y here if your system has a Cadence USBSS or USBSSP
+	  dual-role controller.
+	  It supports: dual-role switch, Host-only, and Peripheral-only.
 
-config CDNS_USB_HOST
+config USB_CDNS_HOST
 	bool
 
+if USB_CDNS_SUPPORT
+
 config USB_CDNS3
 	tristate "Cadence USB3 Dual-Role Controller"
-	depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
-	select USB_XHCI_PLATFORM if USB_XHCI_HCD
-	select USB_ROLE_SWITCH
-	select CDNS_USB_COMMON
+	depends on USB_CDNS_SUPPORT
 	help
 	  Say Y here if your system has a Cadence USB3 dual-role controller.
 	  It supports: dual-role switch, Host-only, and Peripheral-only.
 
 	  If you choose to build this driver is a dynamically linked
 	  as module, the module will be called cdns3.ko.
+endif
 
 if USB_CDNS3
 
@@ -32,7 +39,7 @@ config USB_CDNS3_GADGET
 config USB_CDNS3_HOST
 	bool "Cadence USB3 host controller"
 	depends on USB=y || USB=USB_CDNS3
-	select CDNS_USB_HOST
+	select USB_CDNS_HOST
 	help
 	  Say Y here to enable host controller functionality of the
 	  Cadence driver.
@@ -72,3 +79,45 @@ config USB_CDNS3_IMX
 	  For example, imx8qm and imx8qxp.
 
 endif
+
+if USB_CDNS_SUPPORT
+
+config USB_CDNSP_PCI
+	tristate "Cadence CDNSP Dual-Role Controller"
+	depends on USB_CDNS_SUPPORT && USB_PCI && ACPI
+	help
+	  Say Y here if your system has a Cadence CDNSP dual-role controller.
+	  It supports: dual-role switch Host-only, and Peripheral-only.
+
+	  If you choose to build this driver is a dynamically linked
+	  module, the module will be called cdnsp.ko.
+endif
+
+if USB_CDNSP_PCI
+
+config USB_CDNSP_GADGET
+	bool "Cadence CDNSP device controller"
+	depends on USB_GADGET=y || USB_GADGET=USB_CDNSP_PCI
+	help
+	  Say Y here to enable device controller functionality of the
+	  Cadence CDNSP-DEV driver.
+
+	  Cadence CDNSP Device Controller in device mode is
+	  very similar to XHCI controller. Therefore some algorithms
+	  used has been taken from host driver.
+	  This controller supports FF, HS, SS and SSP mode.
+	  It doesn't support LS.
+
+config USB_CDNSP_HOST
+	bool "Cadence CDNSP host controller"
+	depends on USB=y || USB=USB_CDNSP_PCI
+	select USB_CDNS_HOST
+	help
+	  Say Y here to enable host controller functionality of the
+	  Cadence driver.
+
+	  Host controller is compliant with XHCI so it uses
+	  standard XHCI driver.
+
+endif
+
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index 16df87abf3cf..a84b129f14b8 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -1,20 +1,25 @@
 # SPDX-License-Identifier: GPL-2.0
 # define_trace.h needs to know how to find our header
-CFLAGS_trace.o				:= -I$(src)
+CFLAGS_trace.o					:= -I$(src)
 
-cdns-usb-common-y			:= core.o drd.o
-cdns3-y					:= cdns3-plat.o
+cdns-usb-common-y				:= core.o drd.o
+cdns3-y						:= cdns3-plat.o
 
-obj-$(CONFIG_USB_CDNS3)			+= cdns3.o
-obj-$(CONFIG_CDNS_USB_COMMON)		+= cdns-usb-common.o
+obj-$(CONFIG_USB_CDNS3)				+= cdns3.o
+obj-$(CONFIG_USB_CDNS_SUPPORT)			+= cdns-usb-common.o
 
-cdns-usb-common-$(CONFIG_CDNS_USB_HOST) += host.o
-cdns3-$(CONFIG_USB_CDNS3_GADGET)	+= gadget.o ep0.o
+cdns-usb-common-$(CONFIG_USB_CDNS_HOST) 	+= host.o
+cdns3-$(CONFIG_USB_CDNS3_GADGET)		+= gadget.o ep0.o
 
 ifneq ($(CONFIG_USB_CDNS3_GADGET),)
-cdns3-$(CONFIG_TRACING)			+= trace.o
+cdns3-$(CONFIG_TRACING)				+= trace.o
 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_PCI_WRAP)		+= cdns3-pci-wrap.o
+obj-$(CONFIG_USB_CDNS3_TI)			+= cdns3-ti.o
+obj-$(CONFIG_USB_CDNS3_IMX)			+= cdns3-imx.o
+
+cdnsp-udc-pci-y					:= cdnsp-pci.o
+obj-$(CONFIG_USB_CDNSP_PCI) 			+= cdnsp-udc-pci.o
+cdnsp-udc-pci-$(CONFIG_USB_CDNSP_GADGET)	+= cdnsp-ring.o cdnsp-gadget.o \
+						   cdnsp-mem.o cdnsp-ep0.o
diff --git a/drivers/usb/cdns3/cdnsp-ep0.c b/drivers/usb/cdns3/cdnsp-ep0.c
new file mode 100644
index 000000000000..aa220d06d887
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-ep0.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+
+#include <linux/usb/composite.h>
+#include <linux/usb/gadget.h>
+#include <linux/list.h>
+
+#include "cdnsp-gadget.h"
+
+static void cdnsp_ep0_stall(struct cdnsp_device *pdev)
+{
+	struct cdnsp_request *preq;
+	struct cdnsp_ep *pep;
+
+	pep = &pdev->eps[0];
+	preq = next_request(&pep->pending_list);
+
+	if (pdev->three_stage_setup) {
+		cdnsp_halt_endpoint(pdev, pep, true);
+
+		if (preq)
+			cdnsp_gadget_giveback(pep, preq, -ECONNRESET);
+	} else {
+		pep->ep_state |= EP0_HALTED_STATUS;
+
+		if (preq)
+			list_del(&preq->list);
+
+		cdnsp_status_stage(pdev);
+	}
+}
+
+static int cdnsp_ep0_delegate_req(struct cdnsp_device *pdev,
+				  struct usb_ctrlrequest *ctrl)
+{
+	int ret;
+
+	spin_unlock(&pdev->lock);
+	ret = pdev->gadget_driver->setup(&pdev->gadget, ctrl);
+	spin_lock(&pdev->lock);
+
+	return ret;
+}
+
+static int cdnsp_ep0_set_config(struct cdnsp_device *pdev,
+				struct usb_ctrlrequest *ctrl)
+{
+	enum usb_device_state state = pdev->gadget.state;
+	u32 cfg;
+	int ret;
+
+	cfg = le16_to_cpu(ctrl->wValue);
+
+	switch (state) {
+	case USB_STATE_ADDRESS:
+		break;
+	case USB_STATE_CONFIGURED:
+		break;
+	default:
+		dev_err(pdev->dev, "Set Configuration - bad device state\n");
+		return -EINVAL;
+	}
+
+	ret = cdnsp_ep0_delegate_req(pdev, ctrl);
+	if (ret)
+		return ret;
+
+	if (!cfg)
+		usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
+
+	return 0;
+}
+
+static int cdnsp_ep0_set_address(struct cdnsp_device *pdev,
+				 struct usb_ctrlrequest *ctrl)
+{
+	enum usb_device_state state = pdev->gadget.state;
+	struct cdnsp_slot_ctx *slot_ctx;
+	unsigned int slot_state;
+	int ret;
+	u32 addr;
+
+	addr = le16_to_cpu(ctrl->wValue);
+
+	if (addr > 127) {
+		dev_err(pdev->dev, "Invalid device address %d\n", addr);
+		return -EINVAL;
+	}
+
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
+
+	if (state == USB_STATE_CONFIGURED) {
+		dev_err(pdev->dev, "Can't Set Address from Configured State\n");
+		return -EINVAL;
+	}
+
+	pdev->device_address = le16_to_cpu(ctrl->wValue);
+
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
+	slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+	if (slot_state == SLOT_STATE_ADDRESSED)
+		cdnsp_reset_device(pdev);
+
+	/*set device address*/
+	ret = cdnsp_setup_device(pdev, SETUP_CONTEXT_ADDRESS);
+	if (ret)
+		return ret;
+
+	if (addr)
+		usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
+	else
+		usb_gadget_set_state(&pdev->gadget, USB_STATE_DEFAULT);
+
+	return 0;
+}
+
+int cdnsp_status_stage(struct cdnsp_device *pdev)
+{
+	pdev->ep0_stage = CDNSP_STATUS_STAGE;
+	pdev->ep0_preq.request.length = 0;
+
+	return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
+}
+
+static int cdnsp_w_index_to_ep_index(__le32  wIndex)
+{
+	wIndex = le32_to_cpu(wIndex);
+
+	if (!(wIndex & USB_ENDPOINT_NUMBER_MASK))
+		return 0;
+
+	return ((wIndex & USB_ENDPOINT_NUMBER_MASK) * 2) +
+		(wIndex & USB_ENDPOINT_DIR_MASK ? 1 : 0) - 1;
+}
+
+static int cdnsp_ep0_handle_status(struct cdnsp_device *pdev,
+				   struct usb_ctrlrequest *ctrl)
+{
+	struct cdnsp_ep *pep;
+	__le16 *response;
+	int ep_sts = 0;
+	u16 status = 0;
+	u32 recipient;
+
+	recipient = ctrl->bRequestType & USB_RECIP_MASK;
+
+	switch (recipient) {
+	case USB_RECIP_DEVICE:
+		status = pdev->gadget.is_selfpowered;
+		status |= pdev->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+
+		if (pdev->gadget.speed >= USB_SPEED_SUPER) {
+			status |= pdev->u1_allowed << USB_DEV_STAT_U1_ENABLED;
+			status |= pdev->u2_allowed << USB_DEV_STAT_U2_ENABLED;
+		}
+		break;
+	case USB_RECIP_INTERFACE:
+		/*
+		 * Function Remote Wake Capable	D0
+		 * Function Remote Wakeup	D1
+		 */
+		return cdnsp_ep0_delegate_req(pdev, ctrl);
+	case USB_RECIP_ENDPOINT:
+		pep = &pdev->eps[cdnsp_w_index_to_ep_index(ctrl->wIndex)];
+		ep_sts = GET_EP_CTX_STATE(pep->out_ctx);
+
+		/* check if endpoint is stalled */
+		if (ep_sts == EP_STATE_HALTED)
+			status =  BIT(USB_ENDPOINT_HALT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	response = (__le16 *)pdev->setup_buf;
+	*response = cpu_to_le16(status);
+
+	pdev->ep0_preq.request.length = sizeof(*response);
+	pdev->ep0_preq.request.buf = pdev->setup_buf;
+
+	return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
+}
+
+static void cdnsp_enter_test_mode(struct cdnsp_device *pdev)
+{
+	u32 temp;
+
+	temp = readl(&pdev->active_port->regs->portpmsc) & ~GENMASK(31, 28);
+	temp |= PORT_TEST_MODE(pdev->test_mode);
+	writel(temp, &pdev->active_port->regs->portpmsc);
+}
+
+static int cdnsp_ep0_handle_feature_device(struct cdnsp_device *pdev,
+					   struct usb_ctrlrequest *ctrl,
+					   int set)
+{
+	enum usb_device_state state;
+	enum usb_device_speed speed;
+	u16 tmode;
+
+	state = pdev->gadget.state;
+	speed = pdev->gadget.speed;
+
+	switch (le16_to_cpu(ctrl->wValue)) {
+	case USB_DEVICE_REMOTE_WAKEUP:
+		pdev->may_wakeup = !!set;
+		break;
+	case USB_DEVICE_U1_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
+			return -EINVAL;
+
+		pdev->u1_allowed = !!set;
+		break;
+	case USB_DEVICE_U2_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
+			return -EINVAL;
+
+		pdev->u2_allowed = !!set;
+		break;
+	case USB_DEVICE_LTM_ENABLE:
+		return -EINVAL;
+	case USB_DEVICE_TEST_MODE:
+		if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
+			return -EINVAL;
+
+		tmode = le16_to_cpu(ctrl->wIndex);
+
+		if (!set || (tmode & 0xff) != 0)
+			return -EINVAL;
+
+		tmode = tmode >> 8;
+
+		if (tmode > USB_TEST_FORCE_ENABLE || tmode < USB_TEST_J)
+			return -EINVAL;
+
+		pdev->test_mode = tmode;
+
+		/*
+		 * Test mode must be set before Status Stage but controller
+		 * will start testing sequence after Status Stage.
+		 */
+		cdnsp_enter_test_mode(pdev);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cdnsp_ep0_handle_feature_intf(struct cdnsp_device *pdev,
+					 struct usb_ctrlrequest *ctrl,
+					 int set)
+{
+	u16 wValue, wIndex;
+	int ret;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	wIndex = le16_to_cpu(ctrl->wIndex);
+
+	switch (wValue) {
+	case USB_INTRF_FUNC_SUSPEND:
+		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
+		if (ret)
+			return ret;
+
+		/*
+		 * Remote wakeup is enabled when any function within a device
+		 * is enabled for function remote wakeup.
+		 */
+		if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
+			pdev->may_wakeup++;
+		else
+			if (pdev->may_wakeup > 0)
+				pdev->may_wakeup--;
+
+		return 0;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cdnsp_ep0_handle_feature_endpoint(struct cdnsp_device *pdev,
+					     struct usb_ctrlrequest *ctrl,
+					     int set)
+{
+	struct cdnsp_ep *pep;
+	u32 wValue;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	pep = &pdev->eps[cdnsp_w_index_to_ep_index(ctrl->wIndex)];
+
+	switch (wValue) {
+	case USB_ENDPOINT_HALT:
+		if (!set && (pep->ep_state & EP_WEDGE)) {
+			/* Resets Sequence Number */
+			cdnsp_halt_endpoint(pdev, pep, 0);
+			cdnsp_halt_endpoint(pdev, pep, 1);
+			break;
+		}
+
+		return cdnsp_halt_endpoint(pdev, pep, set);
+	default:
+		dev_warn(pdev->dev, "WARN Incorrect wValue %04x\n", wValue);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cdnsp_ep0_handle_feature(struct cdnsp_device *pdev,
+				    struct usb_ctrlrequest *ctrl,
+				    int set)
+{
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		return cdnsp_ep0_handle_feature_device(pdev, ctrl, set);
+	case USB_RECIP_INTERFACE:
+		return cdnsp_ep0_handle_feature_intf(pdev, ctrl, set);
+	case USB_RECIP_ENDPOINT:
+		return cdnsp_ep0_handle_feature_endpoint(pdev, ctrl, set);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int cdnsp_ep0_set_sel(struct cdnsp_device *pdev,
+			     struct usb_ctrlrequest *ctrl)
+{
+	enum usb_device_state state = pdev->gadget.state;
+	u16 wLength;
+
+	if (state == USB_STATE_DEFAULT)
+		return -EINVAL;
+
+	wLength = le16_to_cpu(ctrl->wLength);
+
+	if (wLength != 6) {
+		dev_err(pdev->dev, "Set SEL should be 6 bytes, got %d\n",
+			wLength);
+		return -EINVAL;
+	}
+
+	/*
+	 * To handle Set SEL we need to receive 6 bytes from Host. So let's
+	 * queue a usb_request for 6 bytes.
+	 */
+	pdev->ep0_preq.request.length = 6;
+	pdev->ep0_preq.request.buf = pdev->setup_buf;
+
+	return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
+}
+
+static int cdnsp_ep0_set_isoch_delay(struct cdnsp_device *pdev,
+				     struct usb_ctrlrequest *ctrl)
+{
+	if (le16_to_cpu(ctrl->wIndex) || le16_to_cpu(ctrl->wLength))
+		return -EINVAL;
+
+	pdev->gadget.isoch_delay = le16_to_cpu(ctrl->wValue);
+
+	return 0;
+}
+
+static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
+				 struct usb_ctrlrequest *ctrl)
+{
+	int ret;
+
+	switch (ctrl->bRequest) {
+	case USB_REQ_GET_STATUS:
+		ret = cdnsp_ep0_handle_status(pdev, ctrl);
+		break;
+	case USB_REQ_CLEAR_FEATURE:
+		ret = cdnsp_ep0_handle_feature(pdev, ctrl, 0);
+		break;
+	case USB_REQ_SET_FEATURE:
+		ret = cdnsp_ep0_handle_feature(pdev, ctrl, 1);
+		break;
+	case USB_REQ_SET_ADDRESS:
+		ret = cdnsp_ep0_set_address(pdev, ctrl);
+		break;
+	case USB_REQ_SET_CONFIGURATION:
+		ret = cdnsp_ep0_set_config(pdev, ctrl);
+		break;
+	case USB_REQ_SET_SEL:
+		ret = cdnsp_ep0_set_sel(pdev, ctrl);
+		break;
+	case USB_REQ_SET_ISOCH_DELAY:
+		ret = cdnsp_ep0_set_isoch_delay(pdev, ctrl);
+		break;
+	case USB_REQ_SET_INTERFACE:
+		/*
+		 * Add request into pending list to block sending status stage
+		 * by libcomposite.
+		 */
+		list_add_tail(&pdev->ep0_preq.list,
+			      &pdev->ep0_preq.pep->pending_list);
+
+		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
+		if (ret == -EBUSY)
+			ret = 0;
+
+		list_del(&pdev->ep0_preq.list);
+		break;
+	default:
+		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
+		break;
+	}
+
+	return ret;
+}
+
+void cdnsp_setup_analyze(struct cdnsp_device *pdev)
+{
+	struct usb_ctrlrequest *ctrl = &pdev->setup;
+	int ret = 0;
+	__le16 len;
+
+	if (!pdev->gadget_driver)
+		goto out;
+
+	if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
+		dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Restore the ep0 to Stopped/Running state. */
+	if (pdev->eps[0].ep_state & EP_HALTED)
+		cdnsp_halt_endpoint(pdev, &pdev->eps[0], 0);
+
+	/*
+	 * Finishing previous SETUP transfer by removing request from
+	 * list and informing upper layer
+	 */
+	if (!list_empty(&pdev->eps[0].pending_list)) {
+		struct cdnsp_request	*req;
+
+		req = next_request(&pdev->eps[0].pending_list);
+		cdnsp_ep_dequeue(&pdev->eps[0], req);
+	}
+
+	len = le16_to_cpu(ctrl->wLength);
+	if (!len) {
+		pdev->three_stage_setup = false;
+		pdev->ep0_expect_in = false;
+	} else {
+		pdev->three_stage_setup = true;
+		pdev->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
+	}
+
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+		ret = cdnsp_ep0_std_request(pdev, ctrl);
+	else
+		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
+
+	if (!len)
+		pdev->ep0_stage = CDNSP_STATUS_STAGE;
+
+	if (ret == USB_GADGET_DELAYED_STATUS)
+		return;
+out:
+	if (ret < 0)
+		cdnsp_ep0_stall(pdev);
+	else if (pdev->ep0_stage == CDNSP_STATUS_STAGE)
+		cdnsp_status_stage(pdev);
+}
diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
new file mode 100644
index 000000000000..18bb4c0d1e08
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -0,0 +1,1954 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/iopoll.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/irq.h>
+#include <linux/dmi.h>
+
+#include "core.h"
+#include "gadget-export.h"
+#include "drd.h"
+#include "cdnsp-gadget.h"
+
+unsigned int cdnsp_port_speed(unsigned int port_status)
+{
+	/*Detect gadget speed based on PORTSC register*/
+	if (DEV_SUPERSPEEDPLUS(port_status))
+		return USB_SPEED_SUPER_PLUS;
+	else if (DEV_SUPERSPEED(port_status))
+		return USB_SPEED_SUPER;
+	else if (DEV_HIGHSPEED(port_status))
+		return USB_SPEED_HIGH;
+	else if (DEV_FULLSPEED(port_status))
+		return USB_SPEED_FULL;
+
+	/* If device is detached then speed will be USB_SPEED_UNKNOWN.*/
+	return USB_SPEED_UNKNOWN;
+}
+
+/*
+ * Given a port state, this function returns a value that would result in the
+ * port being in the same state, if the value was written to the port status
+ * control register.
+ * Save Read Only (RO) bits and save read/write bits where
+ * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
+ * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
+ */
+u32 cdnsp_port_state_to_neutral(u32 state)
+{
+	/* Save read-only status and port state. */
+	return (state & CDNSP_PORT_RO) | (state & CDNSP_PORT_RWS);
+}
+
+/**
+ * Find the offset of the extended capabilities with capability ID id.
+ * @base: PCI MMIO registers base address.
+ * @start: Address at which to start looking, (0 or HCC_PARAMS to start at
+ *         beginning of list)
+ * @id: Extended capability ID to search for.
+ *
+ * Returns the offset of the next matching extended capability structure.
+ * Some capabilities can occur several times,
+ * e.g., the EXT_CAPS_PROTOCOL, and this provides a way to find them all.
+ */
+int cdnsp_find_next_ext_cap(void __iomem *base, u32 start, int id)
+{
+	u32 offset = start;
+	u32 next;
+	u32 val;
+
+	if (!start || start == HCC_PARAMS_OFFSET) {
+		val = readl(base + HCC_PARAMS_OFFSET);
+		if (val == ~0)
+			return 0;
+
+		offset = HCC_EXT_CAPS(val) << 2;
+		if (!offset)
+			return 0;
+	};
+
+	do {
+		val = readl(base + offset);
+		if (val == ~0)
+			return 0;
+
+		if (EXT_CAPS_ID(val) == id && offset != start)
+			return offset;
+
+		next = EXT_CAPS_NEXT(val);
+		offset += next << 2;
+	} while (next);
+
+	return 0;
+}
+
+void cdnsp_set_link_state(struct cdnsp_device *pdev,
+			  __le32 __iomem *port_regs,
+			  u32 link_state)
+{
+	u32 temp;
+
+	temp = readl(port_regs);
+	temp = cdnsp_port_state_to_neutral(temp);
+	temp |= PORT_WKCONN_E | PORT_WKDISC_E;
+	writel(temp, port_regs);
+
+	temp &= ~PORT_PLS_MASK;
+	temp |= PORT_LINK_STROBE | link_state;
+
+	writel(temp, port_regs);
+}
+
+static void cdnsp_disable_port(struct cdnsp_device *pdev,
+			       __le32 __iomem *port_regs)
+{
+	u32 temp = cdnsp_port_state_to_neutral(readl(port_regs));
+
+	writel(temp | PORT_PED, port_regs);
+}
+
+static void cdnsp_clear_port_change_bit(struct cdnsp_device *pdev,
+					__le32 __iomem *port_regs)
+{
+	u32 portsc = readl(port_regs);
+
+	writel(cdnsp_port_state_to_neutral(portsc) |
+	       (portsc & PORT_CHANGE_BITS), port_regs);
+}
+
+static void cdnsp_set_chicken_bits_2(struct cdnsp_device *pdev, u32 bit)
+{
+	__le32 __iomem *reg;
+	void __iomem *base;
+	u32 offset = 0;
+
+	base = &pdev->cap_regs->hc_capbase;
+	offset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);
+	reg = base + offset + REG_CHICKEN_BITS_2_OFFSET;
+
+	bit = readl(reg) | bit;
+	writel(bit, reg);
+}
+
+static void cdnsp_clear_chicken_bits_2(struct cdnsp_device *pdev, u32 bit)
+{
+	__le32 __iomem *reg;
+	void __iomem *base;
+	u32 offset = 0;
+
+	base = &pdev->cap_regs->hc_capbase;
+	offset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);
+	reg = base + offset + REG_CHICKEN_BITS_2_OFFSET;
+
+	bit = readl(reg) & ~bit;
+	writel(bit, reg);
+}
+
+/*
+ * Disable interrupts and begin the controller halting process.
+ */
+static void cdnsp_quiesce(struct cdnsp_device *pdev)
+{
+	u32 halted;
+	u32 mask;
+	u32 cmd;
+
+	mask = ~(u32)(CDNSP_IRQS);
+
+	halted = readl(&pdev->op_regs->status) & STS_HALT;
+	if (!halted)
+		mask &= ~(CMD_R_S | CMD_DEVEN);
+
+	cmd = readl(&pdev->op_regs->command);
+	cmd &= mask;
+	writel(cmd, &pdev->op_regs->command);
+}
+
+/*
+ * Force controller into halt state.
+ *
+ * Disable any IRQs and clear the run/stop bit.
+ * Controller will complete any current and actively pipelined transactions, and
+ * should halt within 16 ms of the run/stop bit being cleared.
+ * Read controller Halted bit in the status register to see when the
+ * controller is finished.
+ */
+int cdnsp_halt(struct cdnsp_device *pdev)
+{
+	int ret;
+	u32 val;
+
+	cdnsp_quiesce(pdev);
+
+	ret = readl_poll_timeout_atomic(&pdev->op_regs->status, val,
+					val & STS_HALT, 1,
+					CDNSP_MAX_HALT_USEC);
+	if (ret) {
+		dev_err(pdev->dev, "ERROR: Device halt failed\n");
+		return ret;
+	}
+
+	pdev->cdnsp_state |= CDNSP_STATE_HALTED;
+
+	return 0;
+}
+
+/*
+ * device controller died, register read returns 0xffffffff, or command never
+ * ends.
+ */
+void cdnsp_died(struct cdnsp_device *pdev)
+{
+	dev_err(pdev->dev, "ERROR: CDNSP controller not responding\n");
+	pdev->cdnsp_state |= CDNSP_STATE_DYING;
+	cdnsp_halt(pdev);
+}
+
+/*
+ * Set the run bit and wait for the device to be running.
+ */
+static int cdnsp_start(struct cdnsp_device *pdev)
+{
+	u32 temp;
+	int ret;
+
+	temp = readl(&pdev->op_regs->command);
+	temp |= (CMD_R_S | CMD_DEVEN);
+	writel(temp, &pdev->op_regs->command);
+
+	pdev->cdnsp_state = 0;
+
+	/*
+	 * Wait for the STS_HALT Status bit to be 0 to indicate the device is
+	 * running.
+	 */
+	ret = readl_poll_timeout_atomic(&pdev->op_regs->status, temp,
+					!(temp & STS_HALT), 1,
+					CDNSP_MAX_HALT_USEC);
+	if (ret) {
+		pdev->cdnsp_state = CDNSP_STATE_DYING;
+		dev_err(pdev->dev, "ERROR: Controller run failed\n");
+	}
+
+	return ret;
+}
+
+/*
+ * Reset a halted controller.
+ *
+ * This resets pipelines, timers, counters, state machines, etc.
+ * Transactions will be terminated immediately, and operational registers
+ * will be set to their defaults.
+ */
+int cdnsp_reset(struct cdnsp_device *pdev)
+{
+	u32 command;
+	u32 temp;
+	int ret;
+
+	temp = readl(&pdev->op_regs->status);
+
+	if (temp == ~(u32)0) {
+		dev_err(pdev->dev, "Device not accessible, reset failed.\n");
+		return -ENODEV;
+	}
+
+	if ((temp & STS_HALT) == 0) {
+		dev_err(pdev->dev, "Controller not halted, aborting reset.\n");
+		return -EINVAL;
+	}
+
+	command = readl(&pdev->op_regs->command);
+	command |= CMD_RESET;
+	writel(command, &pdev->op_regs->command);
+
+	ret = readl_poll_timeout_atomic(&pdev->op_regs->command, temp,
+					!(temp & CMD_RESET), 1,
+					10 * 1000);
+	if (ret) {
+		dev_err(pdev->dev, "ERROR: Controller reset failed\n");
+		return ret;
+	}
+
+	/*
+	 * CDNSP cannot write any doorbells or operational registers other
+	 * than status until the "Controller Not Ready" flag is cleared.
+	 */
+	ret = readl_poll_timeout_atomic(&pdev->op_regs->status, temp,
+					!(temp & STS_CNR), 1,
+					10 * 1000);
+
+	if (ret) {
+		dev_err(pdev->dev, "ERROR: Controller not ready to work\n");
+		return ret;
+	}
+
+	dev_dbg(pdev->dev, "Controller ready to work");
+
+	return ret;
+}
+
+/*
+ * cdnsp_get_endpoint_index - Find the index for an endpoint given its
+ * descriptor.Use the return value to right shift 1 for the bitmask.
+ *
+ * Index = (epnum * 2) + direction - 1,
+ * where direction = 0 for OUT, 1 for IN.
+ * For control endpoints, the IN index is used (OUT index is unused), so
+ * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
+ */
+static unsigned int
+	cdnsp_get_endpoint_index(const struct usb_endpoint_descriptor *desc)
+{
+	unsigned int index = (unsigned int)usb_endpoint_num(desc);
+
+	if (usb_endpoint_xfer_control(desc))
+		return index * 2;
+
+	return (index * 2) + (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
+}
+
+/*
+ * Find the flag for this endpoint (for use in the control context). Use the
+ * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
+ * bit 1, etc.
+ */
+static unsigned int
+	cdnsp_get_endpoint_flag(const struct usb_endpoint_descriptor *desc)
+{
+	return 1 << (cdnsp_get_endpoint_index(desc) + 1);
+}
+
+int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
+{
+	struct cdnsp_device *pdev = pep->pdev;
+	struct usb_request *request;
+	int ret;
+
+	if (preq->epnum == 0 && !list_empty(&pep->pending_list))
+		return -EBUSY;
+
+	request = &preq->request;
+	request->actual = 0;
+	request->status = -EINPROGRESS;
+	preq->direction = pep->direction;
+	preq->epnum = pep->number;
+	preq->td.drbl = 0;
+
+	ret = usb_gadget_map_request_by_dev(pdev->dev, request, pep->direction);
+	if (ret)
+		return ret;
+
+	list_add_tail(&preq->list, &pep->pending_list);
+
+	switch (usb_endpoint_type(pep->endpoint.desc)) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		ret = cdnsp_queue_ctrl_tx(pdev, preq);
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+	case USB_ENDPOINT_XFER_INT:
+		ret = cdnsp_queue_bulk_tx(pdev, preq);
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		ret = cdnsp_queue_isoc_tx_prepare(pdev, preq);
+	}
+
+	if (ret)
+		goto unmap;
+
+	return 0;
+
+unmap:
+	usb_gadget_unmap_request_by_dev(pdev->dev, &preq->request,
+					pep->direction);
+	list_del(&preq->list);
+
+	return ret;
+}
+
+/*
+ * Remove the request's TD from the endpoint ring. This may cause the
+ * controller to stop USB transfers, potentially stopping in the middle of a
+ * TRB buffer. The controller should pick up where it left off in the TD,
+ * unless a Set Transfer Ring Dequeue Pointer is issued.
+ *
+ * The TRBs that make up the buffers for the canceled request will be "removed"
+ * from the ring. Since the ring is a contiguous structure, they can't be
+ * physically removed. Instead, there are two options:
+ *
+ *  1) If the controller is in the middle of processing the request to be
+ *     canceled, we simply move the ring's dequeue pointer past those TRBs
+ *     using the Set Transfer Ring Dequeue Pointer command. This will be
+ *     the common case, when drivers timeout on the last submitted request
+ *     and attempt to cancel.
+ *
+ *  2) If the controller is in the middle of a different TD, we turn the TRBs
+ *     into a series of 1-TRB transfer no-op TDs. No-ops shouldn't be chained.
+ *     The controller will need to invalidate the any TRBs it has cached after
+ *     the stop endpoint command.
+ *
+ *  3) The TD may have completed by the time the Stop Endpoint Command
+ *     completes, so software needs to handle that case too.
+ *
+ */
+int cdnsp_ep_dequeue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
+{
+	struct cdnsp_device *pdev = pep->pdev;
+	int ret;
+
+	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING) {
+		ret = cdnsp_cmd_stop_ep(pdev, pep);
+		if (ret)
+			return ret;
+	}
+
+	return cdnsp_remove_request(pdev, preq, pep);
+}
+
+static void cdnsp_zero_in_ctx(struct cdnsp_device *pdev)
+{
+	struct cdnsp_input_control_ctx *ctrl_ctx;
+	struct cdnsp_slot_ctx *slot_ctx;
+	struct cdnsp_ep_ctx *ep_ctx;
+	int i;
+
+	ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
+
+	/*
+	 * When a device's add flag and drop flag are zero, any subsequent
+	 * configure endpoint command will leave that endpoint's state
+	 * untouched. Make sure we don't leave any old state in the input
+	 * endpoint contexts.
+	 */
+	ctrl_ctx->drop_flags = 0;
+	ctrl_ctx->add_flags = 0;
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx);
+	slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
+
+	/* Endpoint 0 is always valid */
+	slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
+	for (i = 1; i < CDNSP_ENDPOINTS_NUM; ++i) {
+		ep_ctx = cdnsp_get_ep_ctx(&pdev->in_ctx, i);
+		ep_ctx->ep_info = 0;
+		ep_ctx->ep_info2 = 0;
+		ep_ctx->deq = 0;
+		ep_ctx->tx_info = 0;
+	}
+}
+
+/* Issue a configure endpoint command and wait for it to finish. */
+static int cdnsp_configure_endpoint(struct cdnsp_device *pdev)
+{
+	int ret;
+
+	cdnsp_queue_configure_endpoint(pdev, pdev->cmd.in_ctx->dma);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+	if (ret) {
+		dev_err(pdev->dev,
+			"ERR: unexpected command completion code 0x%x.\n", ret);
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static void cdnsp_invalidate_ep_events(struct cdnsp_device *pdev,
+				       struct cdnsp_ep *pep)
+{
+	struct cdnsp_segment *segment;
+	union cdnsp_trb *event;
+	u32 cycle_state;
+	__le32  data;
+
+	event = pdev->event_ring->dequeue;
+	segment = pdev->event_ring->deq_seg;
+	cycle_state = pdev->event_ring->cycle_state;
+
+	while (1) {
+		data = le32_to_cpu(event->trans_event.flags);
+
+		/* Check the owner of the TRB. */
+		if ((data & TRB_CYCLE) != cycle_state)
+			break;
+
+		if (TRB_FIELD_TO_TYPE(data) == TRB_TRANSFER &&
+		    TRB_TO_EP_ID(data) == (pep->idx + 1)) {
+			data |= TRB_EVENT_INVALIDATE;
+			event->trans_event.flags = cpu_to_le32(data);
+		}
+
+		if (cdnsp_last_trb_on_seg(segment, event)) {
+			cycle_state ^= 1;
+			segment = pdev->event_ring->deq_seg->next;
+			event = segment->trbs;
+		} else {
+			event++;
+		}
+	}
+}
+
+int cdnsp_wait_for_cmd_compl(struct cdnsp_device *pdev)
+{
+	struct cdnsp_segment *event_deq_seg;
+	union cdnsp_trb *cmd_trb;
+	dma_addr_t cmd_deq_dma;
+	union cdnsp_trb *event;
+	u32 cycle_state;
+	__le32  flags;
+	int ret, val;
+	u64 cmd_dma;
+
+	cmd_trb = pdev->cmd.command_trb;
+	pdev->cmd.status = 0;
+
+	ret = readl_poll_timeout_atomic(&pdev->op_regs->cmd_ring, val,
+					!CMD_RING_BUSY(val), 1,
+					CDNSP_CMD_TIMEOUT);
+	if (ret) {
+		dev_err(pdev->dev, "ERR: Timeout while waiting for command\n");
+		pdev->cdnsp_state = CDNSP_STATE_DYING;
+		return -ETIMEDOUT;
+	}
+
+	event = pdev->event_ring->dequeue;
+	event_deq_seg = pdev->event_ring->deq_seg;
+	cycle_state = pdev->event_ring->cycle_state;
+
+	cmd_deq_dma = cdnsp_trb_virt_to_dma(pdev->cmd_ring->deq_seg, cmd_trb);
+	if (!cmd_deq_dma)
+		return -EINVAL;
+
+	while (1) {
+		flags = le32_to_cpu(event->event_cmd.flags);
+
+		/* Check the owner of the TRB. */
+		if ((flags & TRB_CYCLE) != cycle_state)
+			return -EINVAL;
+
+		cmd_dma = le64_to_cpu(event->event_cmd.cmd_trb);
+
+		/*
+		 * Check whether the completion event is for last queued
+		 * command.
+		 */
+		if (TRB_FIELD_TO_TYPE(flags) != TRB_COMPLETION ||
+		    cmd_dma != (u64)cmd_deq_dma) {
+			if (!cdnsp_last_trb_on_seg(event_deq_seg, event)) {
+				event++;
+				continue;
+			}
+
+			if (cdnsp_last_trb_on_ring(pdev->event_ring,
+						   event_deq_seg, event))
+				cycle_state ^= 1;
+
+			event_deq_seg = event_deq_seg->next;
+			event = event_deq_seg->trbs;
+			continue;
+		}
+
+		pdev->cmd.status = GET_COMP_CODE(le32_to_cpu(event->event_cmd.status));
+		if (pdev->cmd.status == COMP_SUCCESS)
+			return 0;
+
+		return -pdev->cmd.status;
+	}
+}
+
+int cdnsp_halt_endpoint(struct cdnsp_device *pdev,
+			struct cdnsp_ep *pep,
+			int value)
+{
+	int ret;
+
+	if (value) {
+		ret = cdnsp_cmd_stop_ep(pdev, pep);
+		if (ret)
+			return ret;
+
+		if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_STOPPED) {
+			cdnsp_queue_halt_endpoint(pdev, pep->idx);
+			cdnsp_ring_cmd_db(pdev);
+			ret = cdnsp_wait_for_cmd_compl(pdev);
+		}
+
+		pep->ep_state |= EP_HALTED;
+	} else {
+		/*
+		 * In device mode driver can call reset endpoint command
+		 * from any endpoint state.
+		 */
+		cdnsp_queue_reset_ep(pdev, pep->idx);
+		cdnsp_ring_cmd_db(pdev);
+		ret = cdnsp_wait_for_cmd_compl(pdev);
+		if (ret)
+			return ret;
+
+		pep->ep_state &= ~EP_HALTED;
+
+		if (pep->idx != 0 && !(pep->ep_state & EP_WEDGE))
+			cdnsp_ring_doorbell_for_active_rings(pdev, pep);
+
+		pep->ep_state &= ~EP_WEDGE;
+	}
+
+	return 0;
+}
+
+static int cdnsp_update_eps_configuration(struct cdnsp_device *pdev,
+					  struct cdnsp_ep *pep)
+{
+	struct cdnsp_input_control_ctx *ctrl_ctx;
+	struct cdnsp_slot_ctx *slot_ctx;
+	int ret = 0;
+	u32 ep_sts;
+	int i;
+
+	ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
+
+	/* Don't issue the command if there's no endpoints to update. */
+	if (ctrl_ctx->add_flags == 0 && ctrl_ctx->drop_flags == 0)
+		return 0;
+
+	ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
+	ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG);
+	ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG));
+
+	/* Fix up Context Entries field. Minimum value is EP0 == BIT(1). */
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx);
+	for (i = CDNSP_ENDPOINTS_NUM; i >= 1; i--) {
+		__le32 le32 = cpu_to_le32(BIT(i));
+
+		if ((pdev->eps[i - 1].ring && !(ctrl_ctx->drop_flags & le32)) ||
+		    (ctrl_ctx->add_flags & le32) || i == 1) {
+			slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
+			slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(i));
+			break;
+		}
+	}
+
+	ep_sts = GET_EP_CTX_STATE(pep->out_ctx);
+
+	if ((ctrl_ctx->add_flags != cpu_to_le32(SLOT_FLAG) &&
+	     ep_sts == EP_STATE_DISABLED) ||
+	    (ep_sts != EP_STATE_DISABLED && ctrl_ctx->drop_flags))
+		ret = cdnsp_configure_endpoint(pdev);
+
+	cdnsp_zero_in_ctx(pdev);
+
+	return ret;
+}
+
+/*
+ * This submits a Reset Device Command, which will set the device state to 0,
+ * set the device address to 0, and disable all the endpoints except the default
+ * control endpoint. The USB core should come back and call
+ * cdnsp_setup_device(), and then re-set up the configuration.
+ */
+int cdnsp_reset_device(struct cdnsp_device *pdev)
+{
+	struct cdnsp_slot_ctx *slot_ctx;
+	int slot_state;
+	int ret, i;
+
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx);
+	slot_ctx->dev_info = 0;
+	pdev->device_address = 0;
+
+	/* If device is not setup, there is no point in resetting it. */
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
+	slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (slot_state <= SLOT_STATE_DEFAULT &&
+	    pdev->eps[0].ep_state & EP_HALTED) {
+		cdnsp_halt_endpoint(pdev, &pdev->eps[0], 0);
+	}
+
+	/*
+	 * During Reset Device command controller shall transition the
+	 * endpoint ep0 to the Running State.
+	 */
+	pdev->eps[0].ep_state &= ~(EP_STOPPED | EP_HALTED);
+	pdev->eps[0].ep_state |= EP_ENABLED;
+
+	if (slot_state <= SLOT_STATE_DEFAULT)
+		return 0;
+
+	cdnsp_queue_reset_device(pdev);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	/*
+	 * After Reset Device command all not default endpoints
+	 * are in Disabled state.
+	 */
+	for (i = 1; i < CDNSP_ENDPOINTS_NUM; ++i)
+		pdev->eps[i].ep_state |= EP_STOPPED;
+
+	if (ret)
+		dev_err(pdev->dev, "Reset device failed with error code %d",
+			ret);
+
+	return ret;
+}
+
+/*
+ * Sets the MaxPStreams field and the Linear Stream Array field.
+ * Sets the dequeue pointer to the stream context array.
+ */
+static void cdnsp_setup_streams_ep_input_ctx(struct cdnsp_device *pdev,
+					     struct cdnsp_ep_ctx *ep_ctx,
+					     struct cdnsp_stream_info *stream_info)
+{
+	u32 max_primary_streams;
+
+	/* MaxPStreams is the number of stream context array entries, not the
+	 * number we're actually using. Must be in 2^(MaxPstreams + 1) format.
+	 * fls(0) = 0, fls(0x1) = 1, fls(0x10) = 2, fls(0x100) = 3, etc.
+	 */
+	max_primary_streams = fls(stream_info->num_stream_ctxs) - 2;
+	ep_ctx->ep_info &= cpu_to_le32(~EP_MAXPSTREAMS_MASK);
+	ep_ctx->ep_info |= cpu_to_le32(EP_MAXPSTREAMS(max_primary_streams)
+				       | EP_HAS_LSA);
+	ep_ctx->deq  = cpu_to_le64(stream_info->ctx_array_dma);
+}
+
+/*
+ * The drivers use this function to prepare a bulk endpoints to use streams.
+ *
+ * Don't allow the call to succeed if endpoint only supports one stream
+ * (which means it doesn't support streams at all).
+ */
+int cdnsp_alloc_streams(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	unsigned int num_streams = usb_ss_max_streams(pep->endpoint.comp_desc);
+	unsigned int num_stream_ctxs;
+	int ret;
+
+	if (num_streams ==  0)
+		return 0;
+
+	if (num_streams > STREAM_NUM_STREAMS)
+		return -EINVAL;
+
+	/*
+	 * Add two to the number of streams requested to account for
+	 * stream 0 that is reserved for controller usage and one additional
+	 * for TASK SET FULL response.
+	 */
+	num_streams += 2;
+
+	/* The stream context array size must be a power of two */
+	num_stream_ctxs = roundup_pow_of_two(num_streams);
+
+	ret = cdnsp_alloc_stream_info(pdev, pep, num_stream_ctxs, num_streams);
+	if (ret)
+		return ret;
+
+	cdnsp_setup_streams_ep_input_ctx(pdev, pep->in_ctx, &pep->stream_info);
+
+	pep->ep_state |= EP_HAS_STREAMS;
+	pep->stream_info.td_count = 0;
+	pep->stream_info.first_prime_det = 0;
+
+	/* Subtract 1 for stream 0, which drivers can't use. */
+	return num_streams - 1;
+}
+
+int cdnsp_disable_slot(struct cdnsp_device *pdev)
+{
+	int ret;
+
+	cdnsp_queue_slot_control(pdev, TRB_DISABLE_SLOT);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	pdev->slot_id = 0;
+	pdev->active_port = NULL;
+
+	memset(pdev->in_ctx.bytes, 0, CDNSP_CTX_SIZE);
+	memset(pdev->out_ctx.bytes, 0, CDNSP_CTX_SIZE);
+
+	return ret;
+}
+
+int cdnsp_enable_slot(struct cdnsp_device *pdev)
+{
+	struct cdnsp_slot_ctx *slot_ctx;
+	int slot_state;
+	int ret;
+
+	/* If device is not setup, there is no point in resetting it */
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
+	slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (slot_state != SLOT_STATE_DISABLED)
+		return 0;
+
+	cdnsp_queue_slot_control(pdev, TRB_ENABLE_SLOT);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+	if (ret)
+		return ret;
+
+	pdev->slot_id = 1;
+
+	return 0;
+}
+
+/*
+ * Issue an Address Device command with BSR=0 if setup is SETUP_CONTEXT_ONLY
+ * or with BSR = 1 if set_address is SETUP_CONTEXT_ADDRESS.
+ */
+int cdnsp_setup_device(struct cdnsp_device *pdev, enum cdnsp_setup_dev setup)
+{
+	struct cdnsp_input_control_ctx *ctrl_ctx;
+	struct cdnsp_slot_ctx *slot_ctx;
+	int dev_state = 0;
+	int ret;
+
+	if (!pdev->slot_id)
+		return -EINVAL;
+
+	if (!pdev->active_port->port_num)
+		return -EINVAL;
+
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
+	dev_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (setup == SETUP_CONTEXT_ONLY && dev_state == SLOT_STATE_DEFAULT)
+		return 0;
+
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx);
+	ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
+
+	if (!slot_ctx->dev_info || dev_state == SLOT_STATE_DEFAULT) {
+		ret = cdnsp_setup_addressable_priv_dev(pdev);
+		if (ret)
+			return ret;
+	}
+
+	cdnsp_copy_ep0_dequeue_into_input_ctx(pdev);
+
+	ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
+	ctrl_ctx->drop_flags = 0;
+
+	cdnsp_queue_address_device(pdev, pdev->in_ctx.dma, setup);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	/* Zero the input context control for later use. */
+	ctrl_ctx->add_flags = 0;
+	ctrl_ctx->drop_flags = 0;
+
+	return ret;
+}
+
+void cdnsp_set_usb2_hardware_lpm(struct cdnsp_device *pdev,
+				 struct usb_request *req,
+				 int enable)
+{
+	if (pdev->active_port != &pdev->usb2_port || !pdev->gadget.lpm_capable)
+		return;
+
+	if (enable)
+		writel(PORT_BESL(CDNSP_DEFAULT_BESL) | PORT_L1S_NYET | PORT_HLE,
+		       &pdev->active_port->regs->portpmsc);
+	else
+		writel(PORT_L1S_NYET, &pdev->active_port->regs->portpmsc);
+}
+
+static int cdnsp_get_frame(struct cdnsp_device *pdev)
+{
+	return readl(&pdev->run_regs->microframe_index) >> 3;
+}
+
+static int cdnsp_gadget_ep_enable(struct usb_ep *ep,
+				  const struct usb_endpoint_descriptor *desc)
+{
+	struct cdnsp_input_control_ctx *ctrl_ctx;
+	struct cdnsp_device *pdev;
+	struct cdnsp_ep *pep;
+	unsigned long flags;
+	u32 added_ctxs;
+	int ret;
+
+	if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT ||
+	    !desc->wMaxPacketSize)
+		return -EINVAL;
+
+	pep = to_cdnsp_ep(ep);
+	pdev = pep->pdev;
+
+	if (dev_WARN_ONCE(pdev->dev, pep->ep_state & EP_ENABLED,
+			  "%s is already enabled\n", pep->name))
+		return 0;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	added_ctxs = cdnsp_get_endpoint_flag(desc);
+	if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
+		dev_err(pdev->dev, "ERROR: Bad endpoint number\n");
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	pep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+
+	if (pdev->gadget.speed == USB_SPEED_FULL) {
+		if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT)
+			pep->interval = desc->bInterval << 3;
+		if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_ISOC)
+			pep->interval = BIT(desc->bInterval - 1) << 3;
+	}
+
+	if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_ISOC) {
+		if (pep->interval > BIT(12)) {
+			dev_err(pdev->dev, "bInterval %d not supported\n",
+				desc->bInterval);
+			ret = -EINVAL;
+			goto unlock;
+		}
+		cdnsp_set_chicken_bits_2(pdev, CHICKEN_XDMA_2_TP_CACHE_DIS);
+	}
+
+	ret = cdnsp_endpoint_init(pdev, pep, GFP_ATOMIC);
+	if (ret)
+		goto unlock;
+
+	ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
+	ctrl_ctx->add_flags = cpu_to_le32(added_ctxs);
+	ctrl_ctx->drop_flags = 0;
+
+	ret = cdnsp_update_eps_configuration(pdev, pep);
+	if (ret) {
+		cdnsp_free_endpoint_rings(pdev, pep);
+		goto unlock;
+	}
+
+	pep->ep_state |= EP_ENABLED;
+	pep->ep_state &= ~EP_STOPPED;
+
+unlock:
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
+{
+	struct cdnsp_input_control_ctx *ctrl_ctx;
+	struct cdnsp_request *preq;
+	struct cdnsp_device *pdev;
+	struct cdnsp_ep *pep;
+	unsigned long flags;
+	u32 drop_flag;
+	int ret = 0;
+
+	if (!ep)
+		return -EINVAL;
+
+	pep = to_cdnsp_ep(ep);
+	pdev = pep->pdev;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	if (!(pep->ep_state & EP_ENABLED)) {
+		dev_err(pdev->dev, "%s is already disabled\n", pep->name);
+		ret = -EINVAL;
+		goto finish;
+	}
+
+	cdnsp_cmd_stop_ep(pdev, pep);
+	pep->ep_state |= EP_DIS_IN_RROGRESS;
+	cdnsp_cmd_flush_ep(pdev, pep);
+
+	/* Remove all queued USB requests. */
+	while (!list_empty(&pep->pending_list)) {
+		preq = next_request(&pep->pending_list);
+		cdnsp_ep_dequeue(pep, preq);
+	}
+
+	cdnsp_invalidate_ep_events(pdev, pep);
+
+	pep->ep_state &= ~EP_DIS_IN_RROGRESS;
+	drop_flag = cdnsp_get_endpoint_flag(pep->endpoint.desc);
+	ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
+	ctrl_ctx->drop_flags = cpu_to_le32(drop_flag);
+	ctrl_ctx->add_flags = 0;
+
+	cdnsp_endpoint_zero(pdev, pep);
+
+	ret = cdnsp_update_eps_configuration(pdev, pep);
+	cdnsp_free_endpoint_rings(pdev, pep);
+
+	pep->ep_state &= ~EP_ENABLED;
+	pep->ep_state |= EP_STOPPED;
+
+finish:
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+static struct usb_request *cdnsp_gadget_ep_alloc_request(struct usb_ep *ep,
+							 gfp_t gfp_flags)
+{
+	struct cdnsp_ep *pep = to_cdnsp_ep(ep);
+	struct cdnsp_request *preq;
+
+	preq = kzalloc(sizeof(*preq), gfp_flags);
+	if (!preq)
+		return NULL;
+
+	preq->epnum = pep->number;
+	preq->pep = pep;
+
+	return &preq->request;
+}
+
+static void cdnsp_gadget_ep_free_request(struct usb_ep *ep,
+					 struct usb_request *request)
+{
+	struct cdnsp_request *preq = to_cdnsp_request(request);
+
+	kfree(preq);
+}
+
+static int cdnsp_gadget_ep_queue(struct usb_ep *ep,
+				 struct usb_request *request,
+				 gfp_t gfp_flags)
+{
+	struct cdnsp_request *preq;
+	struct cdnsp_device *pdev;
+	struct cdnsp_ep *pep;
+	unsigned long flags;
+	int ret;
+
+	if (!request || !ep)
+		return -EINVAL;
+
+	pep = to_cdnsp_ep(ep);
+	pdev = pep->pdev;
+
+	if (!(pep->ep_state & EP_ENABLED)) {
+		dev_err(pdev->dev, "%s: can't queue to disabled endpoint\n",
+			pep->name);
+		return -EINVAL;
+	}
+
+	preq = to_cdnsp_request(request);
+	spin_lock_irqsave(&pdev->lock, flags);
+	ret = cdnsp_ep_enqueue(pep, preq);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+static int cdnsp_gadget_ep_dequeue(struct usb_ep *ep,
+				   struct usb_request *request)
+{
+	struct cdnsp_ep *pep = to_cdnsp_ep(ep);
+	struct cdnsp_device *pdev = pep->pdev;
+	unsigned long flags;
+	int ret;
+
+	if (!pep->endpoint.desc) {
+		dev_err(pdev->dev,
+			"%s: can't dequeue to disabled endpoint\n",
+			pep->name);
+		return -ESHUTDOWN;
+	}
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	ret = cdnsp_ep_dequeue(pep, to_cdnsp_request(request));
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+static int cdnsp_gadget_ep_set_halt(struct usb_ep *ep, int value)
+{
+	struct cdnsp_ep *pep = to_cdnsp_ep(ep);
+	struct cdnsp_device *pdev = pep->pdev;
+	struct cdnsp_request *preq;
+	unsigned long flags = 0;
+	int ret;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	preq = next_request(&pep->pending_list);
+	if (value) {
+		if (preq) {
+			ret = -EAGAIN;
+			goto done;
+		}
+	}
+
+	ret = cdnsp_halt_endpoint(pdev, pep, value);
+
+done:
+	spin_unlock_irqrestore(&pdev->lock, flags);
+	return ret;
+}
+
+static int cdnsp_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+	struct cdnsp_ep *pep = to_cdnsp_ep(ep);
+	struct cdnsp_device *pdev = pep->pdev;
+	unsigned long flags = 0;
+	int ret;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	pep->ep_state |= EP_WEDGE;
+	ret = cdnsp_halt_endpoint(pdev, pep, 1);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+static const struct usb_ep_ops cdnsp_gadget_ep0_ops = {
+	.enable		= cdnsp_gadget_ep_enable,
+	.disable	= cdnsp_gadget_ep_disable,
+	.alloc_request	= cdnsp_gadget_ep_alloc_request,
+	.free_request	= cdnsp_gadget_ep_free_request,
+	.queue		= cdnsp_gadget_ep_queue,
+	.dequeue	= cdnsp_gadget_ep_dequeue,
+	.set_halt	= cdnsp_gadget_ep_set_halt,
+	.set_wedge	= cdnsp_gadget_ep_set_wedge,
+};
+
+static const struct usb_ep_ops cdnsp_gadget_ep_ops = {
+	.enable		= cdnsp_gadget_ep_enable,
+	.disable	= cdnsp_gadget_ep_disable,
+	.alloc_request	= cdnsp_gadget_ep_alloc_request,
+	.free_request	= cdnsp_gadget_ep_free_request,
+	.queue		= cdnsp_gadget_ep_queue,
+	.dequeue	= cdnsp_gadget_ep_dequeue,
+	.set_halt	= cdnsp_gadget_ep_set_halt,
+	.set_wedge	= cdnsp_gadget_ep_set_wedge,
+};
+
+void cdnsp_gadget_giveback(struct cdnsp_ep *pep,
+			   struct cdnsp_request *preq,
+			   int status)
+{
+	struct cdnsp_device *pdev = pep->pdev;
+
+	list_del(&preq->list);
+
+	if (preq->request.status == -EINPROGRESS)
+		preq->request.status = status;
+
+	usb_gadget_unmap_request_by_dev(pdev->dev, &preq->request,
+					preq->direction);
+
+	if (preq != &pdev->ep0_preq) {
+		spin_unlock(&pdev->lock);
+		usb_gadget_giveback_request(&pep->endpoint, &preq->request);
+		spin_lock(&pdev->lock);
+	}
+}
+
+static struct usb_endpoint_descriptor cdnsp_gadget_ep0_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+	.bmAttributes =		USB_ENDPOINT_XFER_CONTROL,
+};
+
+static int cdnsp_run(struct cdnsp_device *pdev,
+		     enum usb_device_speed speed)
+{
+	u32 fs_speed = 0;
+	u64 temp_64;
+	u32 temp;
+	int ret;
+
+	temp_64 = cdnsp_read_64(&pdev->ir_set->erst_dequeue);
+	temp_64 &= ~ERST_PTR_MASK;
+	temp = readl(&pdev->ir_set->irq_control);
+	temp &= ~IMOD_INTERVAL_MASK;
+	temp |= ((IMOD_DEFAULT_INTERVAL / 250) & IMOD_INTERVAL_MASK);
+	writel(temp, &pdev->ir_set->irq_control);
+
+	temp = readl(&pdev->port3x_regs->mode_addr);
+
+	switch (speed) {
+	case USB_SPEED_SUPER_PLUS:
+		temp |= CFG_3XPORT_SSP_SUPPORT;
+		break;
+	case USB_SPEED_SUPER:
+		temp &= ~CFG_3XPORT_SSP_SUPPORT;
+		break;
+	case USB_SPEED_HIGH:
+		break;
+	case USB_SPEED_FULL:
+		fs_speed = PORT_REG6_FORCE_FS;
+		break;
+	default:
+		dev_err(pdev->dev, "invalid maximum_speed parameter %d\n",
+			speed);
+		fallthrough;
+	case USB_SPEED_UNKNOWN:
+		/* Default to superspeed. */
+		speed = USB_SPEED_SUPER;
+		break;
+	}
+
+	if (speed >= USB_SPEED_SUPER) {
+		writel(temp, &pdev->port3x_regs->mode_addr);
+		cdnsp_set_link_state(pdev, &pdev->usb3_port.regs->portsc,
+				     XDEV_RXDETECT);
+	} else {
+		cdnsp_disable_port(pdev, &pdev->usb3_port.regs->portsc);
+	}
+
+	cdnsp_set_link_state(pdev, &pdev->usb2_port.regs->portsc,
+			     XDEV_RXDETECT);
+
+	cdnsp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+
+	writel(PORT_REG6_L1_L0_HW_EN | fs_speed, &pdev->port20_regs->port_reg6);
+
+	ret = cdnsp_start(pdev);
+	if (ret) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	temp = readl(&pdev->op_regs->command);
+	temp |= (CMD_INTE);
+	writel(temp, &pdev->op_regs->command);
+
+	temp = readl(&pdev->ir_set->irq_pending);
+	writel(IMAN_IE_SET(temp), &pdev->ir_set->irq_pending);
+
+	return 0;
+err:
+	cdnsp_halt(pdev);
+	return ret;
+}
+
+static int cdnsp_gadget_udc_start(struct usb_gadget *g,
+				  struct usb_gadget_driver *driver)
+{
+	enum usb_device_speed max_speed = driver->max_speed;
+	struct cdnsp_device *pdev = gadget_to_cdnsp(g);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	pdev->gadget_driver = driver;
+
+	/* limit speed if necessary */
+	max_speed = min(driver->max_speed, g->max_speed);
+	ret = cdnsp_run(pdev, max_speed);
+
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+/*
+ * Update Event Ring Dequeue Pointer:
+ * - When all events have finished
+ * - To avoid "Event Ring Full Error" condition
+ */
+void cdnsp_update_erst_dequeue(struct cdnsp_device *pdev,
+			       union cdnsp_trb *event_ring_deq,
+			       u8 clear_ehb)
+{
+	u64 temp_64;
+	dma_addr_t deq;
+
+	temp_64 = cdnsp_read_64(&pdev->ir_set->erst_dequeue);
+
+	/* If necessary, update the HW's version of the event ring deq ptr. */
+	if (event_ring_deq != pdev->event_ring->dequeue) {
+		deq = cdnsp_trb_virt_to_dma(pdev->event_ring->deq_seg,
+					    pdev->event_ring->dequeue);
+		temp_64 &= ERST_PTR_MASK;
+		temp_64 |= ((u64)deq & (u64)~ERST_PTR_MASK);
+	}
+
+	/* Clear the event handler busy flag (RW1C). */
+	if (clear_ehb)
+		temp_64 |= ERST_EHB;
+	else
+		temp_64 &= ~ERST_EHB;
+
+	cdnsp_write_64(temp_64, &pdev->ir_set->erst_dequeue);
+}
+
+static void cdnsp_clear_cmd_ring(struct cdnsp_device *pdev)
+{
+	struct cdnsp_segment *seg;
+	u64 val_64;
+	int i;
+
+	cdnsp_initialize_ring_info(pdev->cmd_ring);
+
+	seg = pdev->cmd_ring->first_seg;
+	for (i = 0; i < pdev->cmd_ring->num_segs; i++) {
+		memset(seg->trbs, 0,
+		       sizeof(union cdnsp_trb) * (TRBS_PER_SEGMENT - 1));
+		seg = seg->next;
+	}
+
+	/* Set the address in the Command Ring Control register. */
+	val_64 = cdnsp_read_64(&pdev->op_regs->cmd_ring);
+	val_64 = (val_64 & (u64)CMD_RING_RSVD_BITS) |
+		 (pdev->cmd_ring->first_seg->dma & (u64)~CMD_RING_RSVD_BITS) |
+		 pdev->cmd_ring->cycle_state;
+	cdnsp_write_64(val_64, &pdev->op_regs->cmd_ring);
+}
+
+static void cdnsp_consume_all_events(struct cdnsp_device *pdev)
+{
+	struct cdnsp_segment *event_deq_seg;
+	union cdnsp_trb *event_ring_deq;
+	union cdnsp_trb *event;
+	u32 cycle_bit;
+
+	event_ring_deq = pdev->event_ring->dequeue;
+	event_deq_seg = pdev->event_ring->deq_seg;
+	event = pdev->event_ring->dequeue;
+
+	/* Update ring dequeue pointer. */
+	while (1) {
+		cycle_bit = (le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE);
+
+		/* Does the controller or driver own the TRB? */
+		if (cycle_bit != pdev->event_ring->cycle_state)
+			break;
+
+		cdnsp_inc_deq(pdev, pdev->event_ring);
+
+		if (!cdnsp_last_trb_on_seg(event_deq_seg, event)) {
+			event++;
+			continue;
+		}
+
+		if (cdnsp_last_trb_on_ring(pdev->event_ring, event_deq_seg,
+					   event))
+			cycle_bit ^= 1;
+
+		event_deq_seg = event_deq_seg->next;
+		event = event_deq_seg->trbs;
+	}
+
+	cdnsp_update_erst_dequeue(pdev,  event_ring_deq, 1);
+}
+
+static void cdnsp_stop(struct cdnsp_device *pdev)
+{
+	u32 temp;
+
+	cdnsp_cmd_flush_ep(pdev, &pdev->eps[0]);
+
+	/* Remove internally queued request for ep0. */
+	if (!list_empty(&pdev->eps[0].pending_list)) {
+		struct cdnsp_request *req;
+
+		req = next_request(&pdev->eps[0].pending_list);
+		if (req == &pdev->ep0_preq)
+			cdnsp_ep_dequeue(&pdev->eps[0], req);
+	}
+
+	cdnsp_disable_port(pdev, &pdev->usb2_port.regs->portsc);
+	cdnsp_disable_port(pdev, &pdev->usb3_port.regs->portsc);
+	cdnsp_disable_slot(pdev);
+	cdnsp_halt(pdev);
+
+	temp = readl(&pdev->op_regs->status);
+	writel((temp & ~0x1fff) | STS_EINT, &pdev->op_regs->status);
+	temp = readl(&pdev->ir_set->irq_pending);
+	writel(IMAN_IE_CLEAR(temp), &pdev->ir_set->irq_pending);
+
+	cdnsp_clear_port_change_bit(pdev, &pdev->usb2_port.regs->portsc);
+	cdnsp_clear_port_change_bit(pdev, &pdev->usb3_port.regs->portsc);
+
+	/* Clear interrupt line */
+	temp = readl(&pdev->ir_set->irq_pending);
+	temp |= IMAN_IP;
+	writel(temp, &pdev->ir_set->irq_pending);
+
+	cdnsp_consume_all_events(pdev);
+	cdnsp_clear_cmd_ring(pdev);
+}
+
+/*
+ * Stop controller.
+ * This function is called by the gadget core when the driver is removed.
+ * Disable slot, disable IRQs, and quiesce the controller.
+ */
+static int cdnsp_gadget_udc_stop(struct usb_gadget *g)
+{
+	struct cdnsp_device *pdev = gadget_to_cdnsp(g);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	cdnsp_stop(pdev);
+	pdev->gadget_driver = NULL;
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static int cdnsp_gadget_get_frame(struct usb_gadget *g)
+{
+	struct cdnsp_device *pdev = gadget_to_cdnsp(g);
+
+	return cdnsp_get_frame(pdev);
+}
+
+static void __cdnsp_gadget_wakeup(struct cdnsp_device *pdev)
+{
+	struct cdnsp_port_regs __iomem *port_regs;
+	u32 portpm, portsc;
+
+	port_regs = pdev->active_port->regs;
+	portsc = readl(&port_regs->portsc) & PORT_PLS_MASK;
+
+	/* Remote wakeup feature is not enabled by host. */
+	if (pdev->gadget.speed < USB_SPEED_SUPER && portsc == XDEV_U2) {
+		portpm = readl(&port_regs->portpmsc);
+
+		if (!(portpm & PORT_RWE))
+			return;
+	}
+
+	if (portsc == XDEV_U3 && !pdev->may_wakeup)
+		return;
+
+	cdnsp_set_link_state(pdev, &port_regs->portsc, XDEV_U0);
+
+	pdev->cdnsp_state |= CDNSP_WAKEUP_PENDING;
+}
+
+static int cdnsp_gadget_wakeup(struct usb_gadget *g)
+{
+	struct cdnsp_device *pdev = gadget_to_cdnsp(g);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	__cdnsp_gadget_wakeup(pdev);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static int cdnsp_gadget_set_selfpowered(struct usb_gadget *g,
+					int is_selfpowered)
+{
+	struct cdnsp_device *pdev = gadget_to_cdnsp(g);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	g->is_selfpowered = !!is_selfpowered;
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static int cdnsp_gadget_pullup(struct usb_gadget *gadget, int is_on)
+{
+	struct cdnsp_device *pdev = gadget_to_cdnsp(gadget);
+	struct cdns *cdns = dev_get_drvdata(pdev->dev);
+
+	if (!is_on) {
+		cdnsp_reset_device(pdev);
+		cdns_clear_vbus(cdns);
+	} else {
+		cdns_set_vbus(cdns);
+	}
+	return 0;
+}
+
+const struct usb_gadget_ops cdnsp_gadget_ops = {
+	.get_frame		= cdnsp_gadget_get_frame,
+	.wakeup			= cdnsp_gadget_wakeup,
+	.set_selfpowered	= cdnsp_gadget_set_selfpowered,
+	.pullup			= cdnsp_gadget_pullup,
+	.udc_start		= cdnsp_gadget_udc_start,
+	.udc_stop		= cdnsp_gadget_udc_stop,
+};
+
+static void cdnsp_get_ep_buffering(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep)
+{
+	void __iomem *reg = &pdev->cap_regs->hc_capbase;
+	int endpoints;
+
+	reg += cdnsp_find_next_ext_cap(reg, 0, XBUF_CAP_ID);
+
+	if (!pep->direction) {
+		pep->buffering = readl(reg + XBUF_RX_TAG_MASK_0_OFFSET);
+		pep->buffering_period = readl(reg + XBUF_RX_TAG_MASK_1_OFFSET);
+		pep->buffering = (pep->buffering + 1) / 2;
+		pep->buffering_period = (pep->buffering_period + 1) / 2;
+		return;
+	}
+
+	endpoints = HCS_ENDPOINTS(readl(&pdev->hcs_params1)) / 2;
+
+	/* Set to XBUF_TX_TAG_MASK_0 register. */
+	reg += XBUF_TX_CMD_OFFSET + (endpoints * 2 + 2) * sizeof(u32);
+	/* Set reg to XBUF_TX_TAG_MASK_N related with this endpoint. */
+	reg += pep->number * sizeof(u32) * 2;
+
+	pep->buffering = (readl(reg) + 1) / 2;
+	pep->buffering_period = pep->buffering;
+}
+
+static int cdnsp_gadget_init_endpoints(struct cdnsp_device *pdev)
+{
+	int max_streams = HCC_MAX_PSA(pdev->hcc_params);
+	struct cdnsp_ep *pep;
+	int i;
+
+	INIT_LIST_HEAD(&pdev->gadget.ep_list);
+
+	if (max_streams < STREAM_LOG_STREAMS) {
+		dev_err(pdev->dev, "Stream size %d not supported\n",
+			max_streams);
+		return -EINVAL;
+	}
+
+	max_streams = STREAM_LOG_STREAMS;
+
+	for (i = 0; i < CDNSP_ENDPOINTS_NUM; i++) {
+		bool direction = !(i & 1); /* Start from OUT endpoint. */
+		u8 epnum = ((i + 1) >> 1);
+
+		if (!CDNSP_IF_EP_EXIST(pdev, epnum, direction))
+			continue;
+
+		pep = &pdev->eps[i];
+		pep->pdev = pdev;
+		pep->number = epnum;
+		pep->direction = direction; /* 0 for OUT, 1 for IN. */
+
+		/*
+		 * Ep0 is bidirectional, so ep0in and ep0out are represented by
+		 * pdev->eps[0]
+		 */
+		if (epnum == 0) {
+			snprintf(pep->name, sizeof(pep->name), "ep%d%s",
+				 epnum, "BiDir");
+
+			pep->idx = 0;
+			usb_ep_set_maxpacket_limit(&pep->endpoint, 512);
+			pep->endpoint.maxburst = 1;
+			pep->endpoint.ops = &cdnsp_gadget_ep0_ops;
+			pep->endpoint.desc = &cdnsp_gadget_ep0_desc;
+			pep->endpoint.comp_desc = NULL;
+			pep->endpoint.caps.type_control = true;
+			pep->endpoint.caps.dir_in = true;
+			pep->endpoint.caps.dir_out = true;
+
+			pdev->ep0_preq.epnum = pep->number;
+			pdev->ep0_preq.pep = pep;
+			pdev->gadget.ep0 = &pep->endpoint;
+		} else {
+			snprintf(pep->name, sizeof(pep->name), "ep%d%s",
+				 epnum, (pep->direction) ? "in" : "out");
+
+			pep->idx =  (epnum * 2 + (direction ? 1 : 0)) - 1;
+			usb_ep_set_maxpacket_limit(&pep->endpoint, 1024);
+
+			pep->endpoint.max_streams = max_streams;
+			pep->endpoint.ops = &cdnsp_gadget_ep_ops;
+			list_add_tail(&pep->endpoint.ep_list,
+				      &pdev->gadget.ep_list);
+
+			pep->endpoint.caps.type_iso = true;
+			pep->endpoint.caps.type_bulk = true;
+			pep->endpoint.caps.type_int = true;
+
+			pep->endpoint.caps.dir_in = direction;
+			pep->endpoint.caps.dir_out = !direction;
+		}
+
+		pep->endpoint.name = pep->name;
+		pep->in_ctx = cdnsp_get_ep_ctx(&pdev->in_ctx, pep->idx);
+		pep->out_ctx = cdnsp_get_ep_ctx(&pdev->out_ctx, pep->idx);
+		cdnsp_get_ep_buffering(pdev, pep);
+
+		dev_dbg(pdev->dev, "Init %s, MPS: %04x SupType: "
+			"CTRL: %s, INT: %s, BULK: %s, ISOC %s, "
+			"SupDir IN: %s, OUT: %s\n",
+			pep->name, 1024,
+			(pep->endpoint.caps.type_control) ? "yes" : "no",
+			(pep->endpoint.caps.type_int) ? "yes" : "no",
+			(pep->endpoint.caps.type_bulk) ? "yes" : "no",
+			(pep->endpoint.caps.type_iso) ? "yes" : "no",
+			(pep->endpoint.caps.dir_in) ? "yes" : "no",
+			(pep->endpoint.caps.dir_out) ? "yes" : "no");
+
+		INIT_LIST_HEAD(&pep->pending_list);
+	}
+
+	return 0;
+}
+
+static void cdnsp_gadget_free_endpoints(struct cdnsp_device *pdev)
+{
+	struct cdnsp_ep *pep;
+	int i;
+
+	for (i = 0; i < CDNSP_ENDPOINTS_NUM; i++) {
+		pep = &pdev->eps[i];
+		if (pep->number != 0 && pep->out_ctx)
+			list_del(&pep->endpoint.ep_list);
+	}
+}
+
+void cdnsp_disconnect_gadget(struct cdnsp_device *pdev)
+{
+	pdev->cdnsp_state |= CDNSP_STATE_DISCONNECT_PENDING;
+
+	if (pdev->gadget_driver && pdev->gadget_driver->disconnect) {
+		spin_unlock(&pdev->lock);
+		pdev->gadget_driver->disconnect(&pdev->gadget);
+		spin_lock(&pdev->lock);
+	}
+
+	pdev->gadget.speed = USB_SPEED_UNKNOWN;
+	usb_gadget_set_state(&pdev->gadget, USB_STATE_NOTATTACHED);
+
+	pdev->cdnsp_state &= ~CDNSP_STATE_DISCONNECT_PENDING;
+}
+
+void cdnsp_suspend_gadget(struct cdnsp_device *pdev)
+{
+	if (pdev->gadget_driver && pdev->gadget_driver->suspend) {
+		spin_unlock(&pdev->lock);
+		pdev->gadget_driver->suspend(&pdev->gadget);
+		spin_lock(&pdev->lock);
+	}
+}
+
+void cdnsp_resume_gadget(struct cdnsp_device *pdev)
+{
+	if (pdev->gadget_driver && pdev->gadget_driver->resume) {
+		spin_unlock(&pdev->lock);
+		pdev->gadget_driver->resume(&pdev->gadget);
+		spin_lock(&pdev->lock);
+	}
+}
+
+void cdnsp_irq_reset(struct cdnsp_device *pdev)
+{
+	struct cdnsp_port_regs __iomem *port_regs;
+
+	cdnsp_reset_device(pdev);
+
+	port_regs = pdev->active_port->regs;
+	pdev->gadget.speed = cdnsp_port_speed(readl(port_regs));
+
+	spin_unlock(&pdev->lock);
+	usb_gadget_udc_reset(&pdev->gadget, pdev->gadget_driver);
+	spin_lock(&pdev->lock);
+
+	switch (pdev->gadget.speed) {
+	case USB_SPEED_SUPER_PLUS:
+	case USB_SPEED_SUPER:
+		cdnsp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+		pdev->gadget.ep0->maxpacket = 512;
+		break;
+	case USB_SPEED_HIGH:
+	case USB_SPEED_FULL:
+		cdnsp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
+		pdev->gadget.ep0->maxpacket = 64;
+		break;
+	default:
+		/* Low speed is not supported. */
+		dev_err(pdev->dev, "Unknown device speed\n");
+		break;
+	}
+
+	cdnsp_clear_chicken_bits_2(pdev, CHICKEN_XDMA_2_TP_CACHE_DIS);
+	cdnsp_setup_device(pdev, SETUP_CONTEXT_ONLY);
+	usb_gadget_set_state(&pdev->gadget, USB_STATE_DEFAULT);
+}
+
+static void cdnsp_get_rev_cap(struct cdnsp_device *pdev)
+{
+	void __iomem *reg = &pdev->cap_regs->hc_capbase;
+	struct cdnsp_rev_cap *rev_cap;
+
+	reg += cdnsp_find_next_ext_cap(reg, 0, RTL_REV_CAP);
+	rev_cap = reg;
+
+	pdev->rev_cap.ctrl_revision = readl(&rev_cap->ctrl_revision);
+	pdev->rev_cap.rtl_revision = readl(&rev_cap->rtl_revision);
+	pdev->rev_cap.ep_supported = readl(&rev_cap->ep_supported);
+	pdev->rev_cap.ext_cap = readl(&rev_cap->ext_cap);
+	pdev->rev_cap.rx_buff_size = readl(&rev_cap->rx_buff_size);
+	pdev->rev_cap.tx_buff_size = readl(&rev_cap->tx_buff_size);
+
+	dev_info(pdev->dev, "Rev: %08x/%08x, eps: %08x, buff: %08x/%08x\n",
+		 pdev->rev_cap.ctrl_revision, pdev->rev_cap.rtl_revision,
+		 pdev->rev_cap.ep_supported, pdev->rev_cap.rx_buff_size,
+		 pdev->rev_cap.tx_buff_size);
+}
+
+static int cdnsp_gen_setup(struct cdnsp_device *pdev)
+{
+	int ret;
+	u32 reg;
+
+	pdev->cap_regs = pdev->regs;
+	pdev->op_regs = pdev->regs +
+		HC_LENGTH(readl(&pdev->cap_regs->hc_capbase));
+	pdev->run_regs = pdev->regs +
+		(readl(&pdev->cap_regs->run_regs_off) & RTSOFF_MASK);
+
+	/* Cache read-only capability registers */
+	pdev->hcs_params1 = readl(&pdev->cap_regs->hcs_params1);
+	pdev->hcc_params = readl(&pdev->cap_regs->hc_capbase);
+	pdev->hci_version = HC_VERSION(pdev->hcc_params);
+	pdev->hcc_params = readl(&pdev->cap_regs->hcc_params);
+
+	cdnsp_get_rev_cap(pdev);
+
+	/* Make sure the Device Controller is halted. */
+	ret = cdnsp_halt(pdev);
+	if (ret)
+		return ret;
+
+	/* Reset the internal controller memory state and registers. */
+	ret = cdnsp_reset(pdev);
+	if (ret)
+		return ret;
+
+	/*
+	 * Set dma_mask and coherent_dma_mask to 64-bits,
+	 * if controller supports 64-bit addressing.
+	 */
+	if (HCC_64BIT_ADDR(pdev->hcc_params) &&
+	    !dma_set_mask(pdev->dev, DMA_BIT_MASK(64))) {
+		dev_dbg(pdev->dev, "Enabling 64-bit DMA addresses.\n");
+		dma_set_coherent_mask(pdev->dev, DMA_BIT_MASK(64));
+	} else {
+		/*
+		 * This is to avoid error in cases where a 32-bit USB
+		 * controller is used on a 64-bit capable system.
+		 */
+		ret = dma_set_mask(pdev->dev, DMA_BIT_MASK(32));
+		if (ret)
+			return ret;
+
+		dev_dbg(pdev->dev, "Enabling 32-bit DMA addresses.\n");
+		dma_set_coherent_mask(pdev->dev, DMA_BIT_MASK(32));
+	}
+
+	spin_lock_init(&pdev->lock);
+
+	ret = cdnsp_mem_init(pdev, GFP_KERNEL);
+	if (ret)
+		return ret;
+
+	/*
+	 * Software workaround for U1: after transition
+	 * to U1 the controller starts gating clock, and in some cases,
+	 * it causes that controller stack.
+	 */
+	reg = readl(&pdev->port3x_regs->mode_2);
+	reg &= ~CFG_3XPORT_U1_PIPE_CLK_GATE_EN;
+	writel(reg, &pdev->port3x_regs->mode_2);
+
+	return 0;
+}
+
+static int __cdnsp_gadget_init(struct cdns *cdns)
+{
+	struct cdnsp_device *pdev;
+	u32 max_speed;
+	int ret = -ENOMEM;
+
+	cdns_drd_gadget_on(cdns);
+
+	pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
+	if (!pdev)
+		return -ENOMEM;
+
+	pm_runtime_get_sync(cdns->dev);
+
+	cdns->gadget_dev = pdev;
+	pdev->dev = cdns->dev;
+	pdev->regs = cdns->dev_regs;
+	max_speed = usb_get_maximum_speed(cdns->dev);
+
+	switch (max_speed) {
+	case USB_SPEED_FULL:
+	case USB_SPEED_HIGH:
+	case USB_SPEED_SUPER:
+	case USB_SPEED_SUPER_PLUS:
+		break;
+	default:
+		dev_err(cdns->dev, "invalid speed parameter %d\n", max_speed);
+		fallthrough;
+	case USB_SPEED_UNKNOWN:
+		/* Default to SSP */
+		max_speed = USB_SPEED_SUPER_PLUS;
+		break;
+	}
+
+	pdev->gadget.ops = &cdnsp_gadget_ops;
+	pdev->gadget.name = "cdnsp-gadget";
+	pdev->gadget.speed = USB_SPEED_UNKNOWN;
+	pdev->gadget.sg_supported = 1;
+	pdev->gadget.max_speed = USB_SPEED_SUPER_PLUS;
+	pdev->gadget.lpm_capable = 1;
+
+	pdev->setup_buf = kzalloc(CDNSP_EP0_SETUP_SIZE, GFP_KERNEL);
+	if (!pdev->setup_buf)
+		goto free_pdev;
+
+	/*
+	 * Controller supports not aligned buffer but it should improve
+	 * performance.
+	 */
+	pdev->gadget.quirk_ep_out_aligned_size = true;
+
+	ret = cdnsp_gen_setup(pdev);
+	if (ret) {
+		dev_err(pdev->dev, "Generic initialization failed %d\n", ret);
+		goto free_setup;
+	}
+
+	ret = cdnsp_gadget_init_endpoints(pdev);
+	if (ret) {
+		dev_err(pdev->dev, "failed to initialize endpoints\n");
+		goto halt_pdev;
+	}
+
+	ret = usb_add_gadget_udc(pdev->dev, &pdev->gadget);
+	if (ret) {
+		dev_err(pdev->dev, "failed to register udc\n");
+		goto free_endpoints;
+	}
+
+	ret = devm_request_threaded_irq(pdev->dev, cdns->dev_irq,
+					cdnsp_irq_handler,
+					cdnsp_thread_irq_handler, IRQF_SHARED,
+					dev_name(pdev->dev), pdev);
+	if (ret)
+		goto del_gadget;
+
+	return 0;
+
+del_gadget:
+	usb_del_gadget_udc(&pdev->gadget);
+free_endpoints:
+	cdnsp_gadget_free_endpoints(pdev);
+halt_pdev:
+	cdnsp_halt(pdev);
+	cdnsp_reset(pdev);
+	cdnsp_mem_cleanup(pdev);
+free_setup:
+	kfree(pdev->setup_buf);
+free_pdev:
+	kfree(pdev);
+
+	return ret;
+}
+
+static void cdnsp_gadget_exit(struct cdns *cdns)
+{
+	struct cdnsp_device *pdev = cdns->gadget_dev;
+
+	devm_free_irq(pdev->dev, cdns->dev_irq, pdev);
+	pm_runtime_mark_last_busy(cdns->dev);
+	pm_runtime_put_autosuspend(cdns->dev);
+	usb_del_gadget_udc(&pdev->gadget);
+	cdnsp_gadget_free_endpoints(pdev);
+	cdnsp_mem_cleanup(pdev);
+	kfree(pdev);
+	cdns->gadget_dev = NULL;
+	cdns_drd_gadget_off(cdns);
+}
+
+static int cdnsp_gadget_suspend(struct cdns *cdns, bool do_wakeup)
+{
+	struct cdnsp_device *pdev = cdns->gadget_dev;
+	unsigned long flags;
+
+	if (pdev->link_state == XDEV_U3)
+		return 0;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	cdnsp_disconnect_gadget(pdev);
+	cdnsp_stop(pdev);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static int cdnsp_gadget_resume(struct cdns *cdns, bool hibernated)
+{
+	struct cdnsp_device *pdev = cdns->gadget_dev;
+	enum usb_device_speed max_speed;
+	unsigned long flags;
+	int ret;
+
+	if (!pdev->gadget_driver)
+		return 0;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	max_speed = pdev->gadget_driver->max_speed;
+
+	/* Limit speed if necessary. */
+	max_speed = min(max_speed, pdev->gadget.max_speed);
+
+	ret = cdnsp_run(pdev, max_speed);
+
+	if (pdev->link_state == XDEV_U3)
+		__cdnsp_gadget_wakeup(pdev);
+
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return ret;
+}
+
+/**
+ * cdnsp_gadget_init - initialize device structure
+ * @cdns: cdnsp instance
+ *
+ * This function initializes the gadget.
+ */
+int cdnsp_gadget_init(struct cdns *cdns)
+{
+	struct cdns_role_driver *rdrv;
+
+	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+	if (!rdrv)
+		return -ENOMEM;
+
+	rdrv->start	= __cdnsp_gadget_init;
+	rdrv->stop	= cdnsp_gadget_exit;
+	rdrv->suspend	= cdnsp_gadget_suspend;
+	rdrv->resume	= cdnsp_gadget_resume;
+	rdrv->state	= CDNS_ROLE_STATE_INACTIVE;
+	rdrv->name	= "gadget";
+	cdns->roles[USB_ROLE_DEVICE] = rdrv;
+
+	return 0;
+}
diff --git a/drivers/usb/cdns3/cdnsp-gadget.h b/drivers/usb/cdns3/cdnsp-gadget.h
index 93da1dcdad60..5f8629eae41f 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.h
+++ b/drivers/usb/cdns3/cdnsp-gadget.h
@@ -1460,4 +1460,141 @@ struct cdnsp_device {
 	u16 test_mode;
 };
 
+/*
+ * Registers should always be accessed with double word or quad word accesses.
+ *
+ * Registers with 64-bit address pointers should be written to with
+ * dword accesses by writing the low dword first (ptr[0]), then the high dword
+ * (ptr[1]) second. controller implementations that do not support 64-bit
+ * address pointers will ignore the high dword, and write order is irrelevant.
+ */
+static inline u64 cdnsp_read_64(__le64 __iomem *regs)
+{
+	return lo_hi_readq(regs);
+}
+
+static inline void cdnsp_write_64(const u64 val, __le64 __iomem *regs)
+{
+	lo_hi_writeq(val, regs);
+}
+
+/* CDNSP memory management functions. */
+void cdnsp_mem_cleanup(struct cdnsp_device *pdev);
+int cdnsp_mem_init(struct cdnsp_device *pdev, gfp_t flags);
+int cdnsp_setup_addressable_priv_dev(struct cdnsp_device *pdev);
+void cdnsp_copy_ep0_dequeue_into_input_ctx(struct cdnsp_device *pdev);
+void cdnsp_endpoint_zero(struct cdnsp_device *pdev, struct cdnsp_ep *ep);
+int cdnsp_endpoint_init(struct cdnsp_device *pdev,
+			struct cdnsp_ep *pep,
+			gfp_t mem_flags);
+int cdnsp_ring_expansion(struct cdnsp_device *pdev,
+			 struct cdnsp_ring *ring,
+			 unsigned int num_trbs, gfp_t flags);
+struct cdnsp_ring *cdnsp_dma_to_transfer_ring(struct cdnsp_ep *ep, u64 address);
+int cdnsp_alloc_stream_info(struct cdnsp_device *pdev,
+			    struct cdnsp_ep *pep,
+			    unsigned int num_stream_ctxs,
+			    unsigned int num_streams);
+int cdnsp_alloc_streams(struct cdnsp_device *pdev, struct cdnsp_ep *pep);
+void cdnsp_free_endpoint_rings(struct cdnsp_device *pdev, struct cdnsp_ep *pep);
+
+/* Device controller glue. */
+int cdnsp_find_next_ext_cap(void __iomem *base, u32 start, int id);
+int cdnsp_halt(struct cdnsp_device *pdev);
+void cdnsp_died(struct cdnsp_device *pdev);
+int cdnsp_reset(struct cdnsp_device *pdev);
+irqreturn_t cdnsp_irq_handler(int irq, void *priv);
+int cdnsp_setup_device(struct cdnsp_device *pdev, enum cdnsp_setup_dev setup);
+void cdnsp_set_usb2_hardware_lpm(struct cdnsp_device *usbsssp_data,
+				 struct usb_request *req, int enable);
+irqreturn_t cdnsp_thread_irq_handler(int irq, void *data);
+
+/* Ring, segment, TRB, and TD functions. */
+dma_addr_t cdnsp_trb_virt_to_dma(struct cdnsp_segment *seg,
+				 union cdnsp_trb *trb);
+bool cdnsp_last_trb_on_seg(struct cdnsp_segment *seg, union cdnsp_trb *trb);
+bool cdnsp_last_trb_on_ring(struct cdnsp_ring *ring,
+			    struct cdnsp_segment *seg,
+			    union cdnsp_trb *trb);
+int cdnsp_wait_for_cmd_compl(struct cdnsp_device *pdev);
+void cdnsp_update_erst_dequeue(struct cdnsp_device *pdev,
+			       union cdnsp_trb *event_ring_deq,
+			       u8 clear_ehb);
+void cdnsp_initialize_ring_info(struct cdnsp_ring *ring);
+void cdnsp_ring_cmd_db(struct cdnsp_device *pdev);
+void cdnsp_queue_slot_control(struct cdnsp_device *pdev, u32 trb_type);
+void cdnsp_queue_address_device(struct cdnsp_device *pdev,
+				dma_addr_t in_ctx_ptr,
+				enum cdnsp_setup_dev setup);
+void cdnsp_queue_stop_endpoint(struct cdnsp_device *pdev,
+			       unsigned int ep_index);
+int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq);
+int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq);
+int cdnsp_queue_isoc_tx_prepare(struct cdnsp_device *pdev,
+				struct cdnsp_request *preq);
+void cdnsp_queue_configure_endpoint(struct cdnsp_device *pdev,
+				    dma_addr_t in_ctx_ptr);
+void cdnsp_queue_reset_ep(struct cdnsp_device *pdev, unsigned int ep_index);
+void cdnsp_queue_halt_endpoint(struct cdnsp_device *pdev,
+			       unsigned int ep_index);
+void cdnsp_queue_flush_endpoint(struct cdnsp_device *pdev,
+				unsigned int ep_index);
+void cdnsp_force_header_wakeup(struct cdnsp_device *pdev, int intf_num);
+void cdnsp_queue_reset_device(struct cdnsp_device *pdev);
+void cdnsp_queue_new_dequeue_state(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep,
+				   struct cdnsp_dequeue_state *deq_state);
+void cdnsp_ring_doorbell_for_active_rings(struct cdnsp_device *pdev,
+					  struct cdnsp_ep *pep);
+void cdnsp_inc_deq(struct cdnsp_device *pdev, struct cdnsp_ring *ring);
+void cdnsp_set_link_state(struct cdnsp_device *pdev,
+			  __le32 __iomem *port_regs, u32 link_state);
+u32 cdnsp_port_state_to_neutral(u32 state);
+
+/* CDNSP device controller contexts. */
+int cdnsp_enable_slot(struct cdnsp_device *pdev);
+int cdnsp_disable_slot(struct cdnsp_device *pdev);
+struct cdnsp_input_control_ctx
+	*cdnsp_get_input_control_ctx(struct cdnsp_container_ctx *ctx);
+struct cdnsp_slot_ctx *cdnsp_get_slot_ctx(struct cdnsp_container_ctx *ctx);
+struct cdnsp_ep_ctx *cdnsp_get_ep_ctx(struct cdnsp_container_ctx *ctx,
+				      unsigned int ep_index);
+/* CDNSP gadget interface. */
+void cdnsp_suspend_gadget(struct cdnsp_device *pdev);
+void cdnsp_resume_gadget(struct cdnsp_device *pdev);
+void cdnsp_disconnect_gadget(struct cdnsp_device *pdev);
+void cdnsp_gadget_giveback(struct cdnsp_ep *pep, struct cdnsp_request *preq,
+			   int status);
+int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct cdnsp_request *preq);
+int cdnsp_ep_dequeue(struct cdnsp_ep *pep, struct cdnsp_request *preq);
+unsigned int cdnsp_port_speed(unsigned int port_status);
+void cdnsp_irq_reset(struct cdnsp_device *pdev);
+int cdnsp_halt_endpoint(struct cdnsp_device *pdev,
+			struct cdnsp_ep *pep, int value);
+int cdnsp_cmd_stop_ep(struct cdnsp_device *pdev, struct cdnsp_ep *pep);
+int cdnsp_cmd_flush_ep(struct cdnsp_device *pdev, struct cdnsp_ep *pep);
+void cdnsp_setup_analyze(struct cdnsp_device *pdev);
+int cdnsp_status_stage(struct cdnsp_device *pdev);
+int cdnsp_reset_device(struct cdnsp_device *pdev);
+
+/**
+ * next_request - gets the next request on the given list
+ * @list: the request list to operate on
+ *
+ * Caller should take care of locking. This function return NULL or the first
+ * request available on list.
+ */
+static inline struct cdnsp_request *next_request(struct list_head *list)
+{
+	return list_first_entry_or_null(list, struct cdnsp_request, list);
+}
+
+#define to_cdnsp_ep(ep) (container_of(ep, struct cdnsp_ep, endpoint))
+#define gadget_to_cdnsp(g) (container_of(g, struct cdnsp_device, gadget))
+#define request_to_cdnsp_request(r) (container_of(r, struct cdnsp_request, \
+				     request))
+#define to_cdnsp_request(r) (container_of(r, struct cdnsp_request, request))
+int cdnsp_remove_request(struct cdnsp_device *pdev, struct cdnsp_request *preq,
+			 struct cdnsp_ep *pep);
+
 #endif /* __LINUX_CDNSP_GADGET_H */
diff --git a/drivers/usb/cdns3/cdnsp-mem.c b/drivers/usb/cdns3/cdnsp-mem.c
new file mode 100644
index 000000000000..4c598e2b26e7
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-mem.c
@@ -0,0 +1,1311 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ * Code based on Linux XHCI driver.
+ * Origin: Copyright (C) 2008 Intel Corp.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#include "cdnsp-gadget.h"
+
+static void cdnsp_free_stream_info(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep);
+/*
+ * Allocates a generic ring segment from the ring pool, sets the dma address,
+ * initializes the segment to zero, and sets the private next pointer to NULL.
+ *
+ * "All components of all Command and Transfer TRBs shall be initialized to '0'"
+ */
+static struct cdnsp_segment *cdnsp_segment_alloc(struct cdnsp_device *pdev,
+						 unsigned int cycle_state,
+						 unsigned int max_packet,
+						 gfp_t flags)
+{
+	struct cdnsp_segment *seg;
+	dma_addr_t dma;
+	int i;
+
+	seg = kzalloc(sizeof(*seg), flags);
+	if (!seg)
+		return NULL;
+
+	seg->trbs = dma_pool_zalloc(pdev->segment_pool, flags, &dma);
+	if (!seg->trbs) {
+		kfree(seg);
+		return NULL;
+	}
+
+	if (max_packet) {
+		seg->bounce_buf = kzalloc(max_packet, flags | GFP_DMA);
+		if (!seg->bounce_buf)
+			goto free_dma;
+	}
+
+	/* If the cycle state is 0, set the cycle bit to 1 for all the TRBs. */
+	if (cycle_state == 0) {
+		for (i = 0; i < TRBS_PER_SEGMENT; i++)
+			seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE);
+	}
+	seg->dma = dma;
+	seg->next = NULL;
+
+	return seg;
+
+free_dma:
+	dma_pool_free(pdev->segment_pool, seg->trbs, dma);
+	kfree(seg);
+
+	return NULL;
+}
+
+static void cdnsp_segment_free(struct cdnsp_device *pdev,
+			       struct cdnsp_segment *seg)
+{
+	if (seg->trbs)
+		dma_pool_free(pdev->segment_pool, seg->trbs, seg->dma);
+
+	kfree(seg->bounce_buf);
+	kfree(seg);
+}
+
+static void cdnsp_free_segments_for_ring(struct cdnsp_device *pdev,
+					 struct cdnsp_segment *first)
+{
+	struct cdnsp_segment *seg;
+
+	seg = first->next;
+
+	while (seg != first) {
+		struct cdnsp_segment *next = seg->next;
+
+		cdnsp_segment_free(pdev, seg);
+		seg = next;
+	}
+
+	cdnsp_segment_free(pdev, first);
+}
+
+/*
+ * Make the prev segment point to the next segment.
+ *
+ * Change the last TRB in the prev segment to be a Link TRB which points to the
+ * DMA address of the next segment. The caller needs to set any Link TRB
+ * related flags, such as End TRB, Toggle Cycle, and no snoop.
+ */
+static void cdnsp_link_segments(struct cdnsp_device *pdev,
+				struct cdnsp_segment *prev,
+				struct cdnsp_segment *next,
+				enum cdnsp_ring_type type)
+{
+	struct cdnsp_link_trb *link;
+	u32 val;
+
+	if (!prev || !next)
+		return;
+
+	prev->next = next;
+	if (type != TYPE_EVENT) {
+		link = &prev->trbs[TRBS_PER_SEGMENT - 1].link;
+		link->segment_ptr = cpu_to_le64(next->dma);
+
+		/*
+		 * Set the last TRB in the segment to have a TRB type ID
+		 * of Link TRB
+		 */
+		val = le32_to_cpu(link->control);
+		val &= ~TRB_TYPE_BITMASK;
+		val |= TRB_TYPE(TRB_LINK);
+		link->control = cpu_to_le32(val);
+	}
+}
+
+/*
+ * Link the ring to the new segments.
+ * Set Toggle Cycle for the new ring if needed.
+ */
+static void cdnsp_link_rings(struct cdnsp_device *pdev,
+			     struct cdnsp_ring *ring,
+			     struct cdnsp_segment *first,
+			     struct cdnsp_segment *last,
+			     unsigned int num_segs)
+{
+	struct cdnsp_segment *next;
+
+	if (!ring || !first || !last)
+		return;
+
+	next = ring->enq_seg->next;
+	cdnsp_link_segments(pdev, ring->enq_seg, first, ring->type);
+	cdnsp_link_segments(pdev, last, next, ring->type);
+	ring->num_segs += num_segs;
+	ring->num_trbs_free += (TRBS_PER_SEGMENT - 1) * num_segs;
+
+	if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) {
+		ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control &=
+			~cpu_to_le32(LINK_TOGGLE);
+		last->trbs[TRBS_PER_SEGMENT - 1].link.control |=
+			cpu_to_le32(LINK_TOGGLE);
+		ring->last_seg = last;
+	}
+}
+
+/*
+ * We need a radix tree for mapping physical addresses of TRBs to which stream
+ * ID they belong to. We need to do this because the device controller won't
+ * tell us which stream ring the TRB came from. We could store the stream ID
+ * in an event data TRB, but that doesn't help us for the cancellation case,
+ * since the endpoint may stop before it reaches that event data TRB.
+ *
+ * The radix tree maps the upper portion of the TRB DMA address to a ring
+ * segment that has the same upper portion of DMA addresses. For example,
+ * say I have segments of size 1KB, that are always 1KB aligned. A segment may
+ * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the
+ * key to the stream ID is 0x43244. I can use the DMA address of the TRB to
+ * pass the radix tree a key to get the right stream ID:
+ *
+ *	0x10c90fff >> 10 = 0x43243
+ *	0x10c912c0 >> 10 = 0x43244
+ *	0x10c91400 >> 10 = 0x43245
+ *
+ * Obviously, only those TRBs with DMA addresses that are within the segment
+ * will make the radix tree return the stream ID for that ring.
+ *
+ * Caveats for the radix tree:
+ *
+ * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an
+ * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be
+ * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the
+ * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit
+ * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit
+ * extended systems (where the DMA address can be bigger than 32-bits),
+ * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
+ */
+static int cdnsp_insert_segment_mapping(struct radix_tree_root *trb_address_map,
+					struct cdnsp_ring *ring,
+					struct cdnsp_segment *seg,
+					gfp_t mem_flags)
+{
+	unsigned long key;
+	int ret;
+
+	key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
+
+	/* Skip any segments that were already added. */
+	if (radix_tree_lookup(trb_address_map, key))
+		return 0;
+
+	ret = radix_tree_maybe_preload(mem_flags);
+	if (ret)
+		return ret;
+
+	ret = radix_tree_insert(trb_address_map, key, ring);
+	radix_tree_preload_end();
+
+	return ret;
+}
+
+static void cdnsp_remove_segment_mapping(struct radix_tree_root *trb_address_map,
+					 struct cdnsp_segment *seg)
+{
+	unsigned long key;
+
+	key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
+	if (radix_tree_lookup(trb_address_map, key))
+		radix_tree_delete(trb_address_map, key);
+}
+
+static int cdnsp_update_stream_segment_mapping(struct radix_tree_root *trb_address_map,
+					       struct cdnsp_ring *ring,
+					       struct cdnsp_segment *first_seg,
+					       struct cdnsp_segment *last_seg,
+					       gfp_t mem_flags)
+{
+	struct cdnsp_segment *failed_seg;
+	struct cdnsp_segment *seg;
+	int ret;
+
+	seg = first_seg;
+	do {
+		ret = cdnsp_insert_segment_mapping(trb_address_map, ring, seg,
+						   mem_flags);
+		if (ret)
+			goto remove_streams;
+		if (seg == last_seg)
+			return 0;
+		seg = seg->next;
+	} while (seg != first_seg);
+
+	return 0;
+
+remove_streams:
+	failed_seg = seg;
+	seg = first_seg;
+	do {
+		cdnsp_remove_segment_mapping(trb_address_map, seg);
+		if (seg == failed_seg)
+			return ret;
+		seg = seg->next;
+	} while (seg != first_seg);
+
+	return ret;
+}
+
+static void cdnsp_remove_stream_mapping(struct cdnsp_ring *ring)
+{
+	struct cdnsp_segment *seg;
+
+	seg = ring->first_seg;
+	do {
+		cdnsp_remove_segment_mapping(ring->trb_address_map, seg);
+		seg = seg->next;
+	} while (seg != ring->first_seg);
+}
+
+static int cdnsp_update_stream_mapping(struct cdnsp_ring *ring)
+{
+	return cdnsp_update_stream_segment_mapping(ring->trb_address_map, ring,
+			ring->first_seg, ring->last_seg, GFP_ATOMIC);
+}
+
+static void cdnsp_ring_free(struct cdnsp_device *pdev, struct cdnsp_ring *ring)
+{
+	if (!ring)
+		return;
+
+	if (ring->first_seg) {
+		if (ring->type == TYPE_STREAM)
+			cdnsp_remove_stream_mapping(ring);
+
+		cdnsp_free_segments_for_ring(pdev, ring->first_seg);
+	}
+
+	kfree(ring);
+}
+
+void cdnsp_initialize_ring_info(struct cdnsp_ring *ring)
+{
+	ring->enqueue = ring->first_seg->trbs;
+	ring->enq_seg = ring->first_seg;
+	ring->dequeue = ring->enqueue;
+	ring->deq_seg = ring->first_seg;
+
+	/*
+	 * The ring is initialized to 0. The producer must write 1 to the cycle
+	 * bit to handover ownership of the TRB, so PCS = 1. The consumer must
+	 * compare CCS to the cycle bit to check ownership, so CCS = 1.
+	 *
+	 * New rings are initialized with cycle state equal to 1; if we are
+	 * handling ring expansion, set the cycle state equal to the old ring.
+	 */
+	ring->cycle_state = 1;
+
+	/*
+	 * Each segment has a link TRB, and leave an extra TRB for SW
+	 * accounting purpose
+	 */
+	ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
+}
+
+/* Allocate segments and link them for a ring. */
+static int cdnsp_alloc_segments_for_ring(struct cdnsp_device *pdev,
+					 struct cdnsp_segment **first,
+					 struct cdnsp_segment **last,
+					 unsigned int num_segs,
+					 unsigned int cycle_state,
+					 enum cdnsp_ring_type type,
+					 unsigned int max_packet,
+					 gfp_t flags)
+{
+	struct cdnsp_segment *prev;
+
+	/* Allocate first segment. */
+	prev = cdnsp_segment_alloc(pdev, cycle_state, max_packet, flags);
+	if (!prev)
+		return -ENOMEM;
+
+	num_segs--;
+	*first = prev;
+
+	/* Allocate all other segments. */
+	while (num_segs > 0) {
+		struct cdnsp_segment	*next;
+
+		next = cdnsp_segment_alloc(pdev, cycle_state,
+					   max_packet, flags);
+		if (!next) {
+			cdnsp_free_segments_for_ring(pdev, *first);
+			return -ENOMEM;
+		}
+
+		cdnsp_link_segments(pdev, prev, next, type);
+
+		prev = next;
+		num_segs--;
+	}
+
+	cdnsp_link_segments(pdev, prev, *first, type);
+	*last = prev;
+
+	return 0;
+}
+
+/*
+ * Create a new ring with zero or more segments.
+ *
+ * Link each segment together into a ring.
+ * Set the end flag and the cycle toggle bit on the last segment.
+ */
+static struct cdnsp_ring *cdnsp_ring_alloc(struct cdnsp_device *pdev,
+					   unsigned int num_segs,
+					   enum cdnsp_ring_type type,
+					   unsigned int max_packet,
+					   gfp_t flags)
+{
+	struct cdnsp_ring *ring;
+	int ret;
+
+	ring = kzalloc(sizeof *(ring), flags);
+	if (!ring)
+		return NULL;
+
+	ring->num_segs = num_segs;
+	ring->bounce_buf_len = max_packet;
+	INIT_LIST_HEAD(&ring->td_list);
+	ring->type = type;
+
+	if (num_segs == 0)
+		return ring;
+
+	ret = cdnsp_alloc_segments_for_ring(pdev, &ring->first_seg,
+					    &ring->last_seg, num_segs,
+					    1, type, max_packet, flags);
+	if (ret)
+		goto fail;
+
+	/* Only event ring does not use link TRB. */
+	if (type != TYPE_EVENT)
+		ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
+			cpu_to_le32(LINK_TOGGLE);
+
+	cdnsp_initialize_ring_info(ring);
+
+	return ring;
+fail:
+	kfree(ring);
+	return NULL;
+}
+
+void cdnsp_free_endpoint_rings(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	cdnsp_ring_free(pdev, pep->ring);
+	pep->ring = NULL;
+	cdnsp_free_stream_info(pdev, pep);
+}
+
+/*
+ * Expand an existing ring.
+ * Allocate a new ring which has same segment numbers and link the two rings.
+ */
+int cdnsp_ring_expansion(struct cdnsp_device *pdev,
+			 struct cdnsp_ring *ring,
+			 unsigned int num_trbs,
+			 gfp_t flags)
+{
+	unsigned int num_segs_needed;
+	struct cdnsp_segment *first;
+	struct cdnsp_segment *last;
+	unsigned int num_segs;
+	int ret;
+
+	num_segs_needed = (num_trbs + (TRBS_PER_SEGMENT - 1) - 1) /
+			(TRBS_PER_SEGMENT - 1);
+
+	/* Allocate number of segments we needed, or double the ring size. */
+	num_segs = max(ring->num_segs, num_segs_needed);
+
+	ret = cdnsp_alloc_segments_for_ring(pdev, &first, &last, num_segs,
+					    ring->cycle_state, ring->type,
+					    ring->bounce_buf_len, flags);
+	if (ret)
+		return -ENOMEM;
+
+	if (ring->type == TYPE_STREAM)
+		ret = cdnsp_update_stream_segment_mapping(ring->trb_address_map,
+							  ring, first,
+							  last, flags);
+
+	if (ret) {
+		cdnsp_free_segments_for_ring(pdev, first);
+
+		return ret;
+	}
+
+	cdnsp_link_rings(pdev, ring, first, last, num_segs);
+
+	return 0;
+}
+
+static int cdnsp_init_device_ctx(struct cdnsp_device *pdev)
+{
+	int size = HCC_64BYTE_CONTEXT(pdev->hcc_params) ? 2048 : 1024;
+
+	pdev->out_ctx.type = CDNSP_CTX_TYPE_DEVICE;
+	pdev->out_ctx.size = size;
+	pdev->out_ctx.ctx_size = CTX_SIZE(pdev->hcc_params);
+	pdev->out_ctx.bytes = dma_pool_zalloc(pdev->device_pool, GFP_ATOMIC,
+					      &pdev->out_ctx.dma);
+
+	if (!pdev->out_ctx.bytes)
+		return -ENOMEM;
+
+	pdev->in_ctx.type = CDNSP_CTX_TYPE_INPUT;
+	pdev->in_ctx.ctx_size = pdev->out_ctx.ctx_size;
+	pdev->in_ctx.size = size + pdev->out_ctx.ctx_size;
+	pdev->in_ctx.bytes = dma_pool_zalloc(pdev->device_pool, GFP_ATOMIC,
+					     &pdev->in_ctx.dma);
+
+	if (!pdev->in_ctx.bytes) {
+		dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes,
+			      pdev->out_ctx.dma);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+struct cdnsp_input_control_ctx
+	*cdnsp_get_input_control_ctx(struct cdnsp_container_ctx *ctx)
+{
+	if (ctx->type != CDNSP_CTX_TYPE_INPUT)
+		return NULL;
+
+	return (struct cdnsp_input_control_ctx *)ctx->bytes;
+}
+
+struct cdnsp_slot_ctx *cdnsp_get_slot_ctx(struct cdnsp_container_ctx *ctx)
+{
+	if (ctx->type == CDNSP_CTX_TYPE_DEVICE)
+		return (struct cdnsp_slot_ctx *)ctx->bytes;
+
+	return (struct cdnsp_slot_ctx *)(ctx->bytes + ctx->ctx_size);
+}
+
+struct cdnsp_ep_ctx *cdnsp_get_ep_ctx(struct cdnsp_container_ctx *ctx,
+				      unsigned int ep_index)
+{
+	/* Increment ep index by offset of start of ep ctx array. */
+	ep_index++;
+	if (ctx->type == CDNSP_CTX_TYPE_INPUT)
+		ep_index++;
+
+	return (struct cdnsp_ep_ctx *)(ctx->bytes + (ep_index * ctx->ctx_size));
+}
+
+static void cdnsp_free_stream_ctx(struct cdnsp_device *pdev,
+				  struct cdnsp_ep *pep)
+{
+	dma_pool_free(pdev->device_pool, pep->stream_info.stream_ctx_array,
+		      pep->stream_info.ctx_array_dma);
+}
+
+/* The stream context array must be a power of 2. */
+static struct cdnsp_stream_ctx
+	*cdnsp_alloc_stream_ctx(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	size_t size = sizeof(struct cdnsp_stream_ctx) *
+		      pep->stream_info.num_stream_ctxs;
+
+	if (size > CDNSP_CTX_SIZE)
+		return NULL;
+
+	/**
+	 * Driver uses intentionally the device_pool to allocated stream
+	 * context array. Device Pool has 2048 bytes of size what gives us
+	 * 128 entries.
+	 */
+	return dma_pool_zalloc(pdev->device_pool, GFP_DMA32 | GFP_ATOMIC,
+			       &pep->stream_info.ctx_array_dma);
+}
+
+struct cdnsp_ring *cdnsp_dma_to_transfer_ring(struct cdnsp_ep *pep, u64 address)
+{
+	if (pep->ep_state & EP_HAS_STREAMS)
+		return radix_tree_lookup(&pep->stream_info.trb_address_map,
+					 address >> TRB_SEGMENT_SHIFT);
+
+	return pep->ring;
+}
+
+/*
+ * Change an endpoint's internal structure so it supports stream IDs.
+ * The number of requested streams includes stream 0, which cannot be used by
+ * driver.
+ *
+ * The number of stream contexts in the stream context array may be bigger than
+ * the number of streams the driver wants to use. This is because the number of
+ * stream context array entries must be a power of two.
+ */
+int cdnsp_alloc_stream_info(struct cdnsp_device *pdev,
+			    struct cdnsp_ep *pep,
+			    unsigned int num_stream_ctxs,
+			    unsigned int num_streams)
+{
+	struct cdnsp_stream_info *stream_info;
+	struct cdnsp_ring *cur_ring;
+	u32 cur_stream;
+	u64 addr;
+	int ret;
+	int mps;
+
+	stream_info = &pep->stream_info;
+	stream_info->num_streams = num_streams;
+	stream_info->num_stream_ctxs = num_stream_ctxs;
+
+	/* Initialize the array of virtual pointers to stream rings. */
+	stream_info->stream_rings = kcalloc(num_streams,
+					    sizeof(struct cdnsp_ring *),
+					    GFP_ATOMIC);
+	if (!stream_info->stream_rings)
+		return -ENOMEM;
+
+	/* Initialize the array of DMA addresses for stream rings for the HW. */
+	stream_info->stream_ctx_array = cdnsp_alloc_stream_ctx(pdev, pep);
+	if (!stream_info->stream_ctx_array)
+		goto cleanup_stream_rings;
+
+	memset(stream_info->stream_ctx_array, 0,
+	       sizeof(struct cdnsp_stream_ctx) * num_stream_ctxs);
+	INIT_RADIX_TREE(&stream_info->trb_address_map, GFP_ATOMIC);
+	mps = usb_endpoint_maxp(pep->endpoint.desc);
+
+	/*
+	 * Allocate rings for all the streams that the driver will use,
+	 * and add their segment DMA addresses to the radix tree.
+	 * Stream 0 is reserved.
+	 */
+	for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
+		cur_ring = cdnsp_ring_alloc(pdev, 2, TYPE_STREAM, mps,
+					    GFP_ATOMIC);
+		stream_info->stream_rings[cur_stream] = cur_ring;
+
+		if (!cur_ring)
+			goto cleanup_rings;
+
+		cur_ring->stream_id = cur_stream;
+		cur_ring->trb_address_map = &stream_info->trb_address_map;
+
+		/* Set deq ptr, cycle bit, and stream context type. */
+		addr = cur_ring->first_seg->dma | SCT_FOR_CTX(SCT_PRI_TR) |
+		       cur_ring->cycle_state;
+
+		stream_info->stream_ctx_array[cur_stream].stream_ring =
+			cpu_to_le64(addr);
+
+		ret = cdnsp_update_stream_mapping(cur_ring);
+		if (ret)
+			goto cleanup_rings;
+	}
+
+	return 0;
+
+cleanup_rings:
+	for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
+		cur_ring = stream_info->stream_rings[cur_stream];
+		if (cur_ring) {
+			cdnsp_ring_free(pdev, cur_ring);
+			stream_info->stream_rings[cur_stream] = NULL;
+		}
+	}
+
+cleanup_stream_rings:
+	kfree(pep->stream_info.stream_rings);
+
+	return -ENOMEM;
+}
+
+/* Frees all stream contexts associated with the endpoint. */
+static void cdnsp_free_stream_info(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep)
+{
+	struct cdnsp_stream_info *stream_info = &pep->stream_info;
+	struct cdnsp_ring *cur_ring;
+	int cur_stream;
+
+	if (!(pep->ep_state & EP_HAS_STREAMS))
+		return;
+
+	for (cur_stream = 1; cur_stream < stream_info->num_streams;
+	     cur_stream++) {
+		cur_ring = stream_info->stream_rings[cur_stream];
+		if (cur_ring) {
+			cdnsp_ring_free(pdev, cur_ring);
+			stream_info->stream_rings[cur_stream] = NULL;
+		}
+	}
+
+	if (stream_info->stream_ctx_array)
+		cdnsp_free_stream_ctx(pdev, pep);
+
+	kfree(stream_info->stream_rings);
+	pep->ep_state &= ~EP_HAS_STREAMS;
+}
+
+/* All the cdnsp_tds in the ring's TD list should be freed at this point.*/
+static void cdnsp_free_priv_device(struct cdnsp_device *pdev)
+{
+	pdev->dcbaa->dev_context_ptrs[1] = 0;
+
+	cdnsp_free_endpoint_rings(pdev, &pdev->eps[0]);
+
+	if (pdev->in_ctx.bytes)
+		dma_pool_free(pdev->device_pool, pdev->in_ctx.bytes,
+			      pdev->in_ctx.dma);
+
+	if (pdev->out_ctx.bytes)
+		dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes,
+			      pdev->out_ctx.dma);
+
+	pdev->in_ctx.bytes = NULL;
+	pdev->out_ctx.bytes = NULL;
+}
+
+static int cdnsp_alloc_priv_device(struct cdnsp_device *pdev, gfp_t flags)
+{
+	int ret = -ENOMEM;
+
+	ret = cdnsp_init_device_ctx(pdev);
+	if (ret)
+		return ret;
+
+	/* Allocate endpoint 0 ring. */
+	pdev->eps[0].ring = cdnsp_ring_alloc(pdev, 2, TYPE_CTRL, 0, flags);
+	if (!pdev->eps[0].ring)
+		goto fail;
+
+	/* Point to output device context in dcbaa. */
+	pdev->dcbaa->dev_context_ptrs[1] = cpu_to_le64(pdev->out_ctx.dma);
+	pdev->cmd.in_ctx = &pdev->in_ctx;
+
+	return 0;
+fail:
+	dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes,
+		      pdev->out_ctx.dma);
+	dma_pool_free(pdev->device_pool, pdev->in_ctx.bytes,
+		      pdev->in_ctx.dma);
+
+	return ret;
+}
+
+void cdnsp_copy_ep0_dequeue_into_input_ctx(struct cdnsp_device *pdev)
+{
+	struct cdnsp_ep_ctx *ep0_ctx = pdev->eps[0].in_ctx;
+	struct cdnsp_ring *ep_ring = pdev->eps[0].ring;
+	dma_addr_t dma;
+
+	dma = cdnsp_trb_virt_to_dma(ep_ring->enq_seg, ep_ring->enqueue);
+	ep0_ctx->deq = cpu_to_le64(dma | ep_ring->cycle_state);
+}
+
+/* Setup an controller private device for a Set Address command. */
+int cdnsp_setup_addressable_priv_dev(struct cdnsp_device *pdev)
+{
+	struct cdnsp_slot_ctx *slot_ctx;
+	struct cdnsp_ep_ctx *ep0_ctx;
+	u32 max_packets, port;
+
+	ep0_ctx = cdnsp_get_ep_ctx(&pdev->in_ctx, 0);
+	slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx);
+
+	/* Only the control endpoint is valid - one endpoint context. */
+	slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
+
+	switch (pdev->gadget.speed) {
+	case USB_SPEED_SUPER_PLUS:
+		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP);
+		max_packets = MAX_PACKET(512);
+		break;
+	case USB_SPEED_SUPER:
+		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
+		max_packets = MAX_PACKET(512);
+		break;
+	case USB_SPEED_HIGH:
+		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS);
+		max_packets = MAX_PACKET(64);
+		break;
+	case USB_SPEED_FULL:
+		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS);
+		max_packets = MAX_PACKET(64);
+		break;
+	default:
+		/* Speed was not set , this shouldn't happen. */
+		return -EINVAL;
+	}
+
+	port = DEV_PORT(pdev->active_port->port_num);
+	slot_ctx->dev_port |= cpu_to_le32(port);
+	slot_ctx->dev_state = (pdev->device_address & DEV_ADDR_MASK);
+	ep0_ctx->tx_info = EP_AVG_TRB_LENGTH(0x8);
+	ep0_ctx->ep_info2 = cpu_to_le32(EP_TYPE(CTRL_EP));
+	ep0_ctx->ep_info2 |= cpu_to_le32(MAX_BURST(0) | ERROR_COUNT(3) |
+					 max_packets);
+
+	ep0_ctx->deq = cpu_to_le64(pdev->eps[0].ring->first_seg->dma |
+				   pdev->eps[0].ring->cycle_state);
+
+	return 0;
+}
+
+/*
+ * Convert interval expressed as 2^(bInterval - 1) == interval into
+ * straight exponent value 2^n == interval.
+ */
+static unsigned int cdnsp_parse_exponent_interval(struct usb_gadget *g,
+						  struct cdnsp_ep *pep)
+{
+	unsigned int interval;
+
+	interval = clamp_val(pep->endpoint.desc->bInterval, 1, 16) - 1;
+	if (interval != pep->endpoint.desc->bInterval - 1)
+		dev_warn(&g->dev, "ep %s - rounding interval to %d %sframes\n",
+			 pep->name, 1 << interval,
+			 g->speed == USB_SPEED_FULL ? "" : "micro");
+
+	/*
+	 * Full speed isoc endpoints specify interval in frames,
+	 * not microframes. We are using microframes everywhere,
+	 * so adjust accordingly.
+	 */
+	if (g->speed == USB_SPEED_FULL)
+		interval += 3;	/* 1 frame = 2^3 uframes */
+
+	/* Controller handles only up to 512ms (2^12). */
+	if (interval > 12)
+		interval = 12;
+
+	return interval;
+}
+
+/*
+ * Convert bInterval expressed in microframes (in 1-255 range) to exponent of
+ * microframes, rounded down to nearest power of 2.
+ */
+static unsigned int cdnsp_microframes_to_exponent(struct usb_gadget *g,
+						  struct cdnsp_ep *pep,
+						  unsigned int desc_interval,
+						  unsigned int min_exponent,
+						  unsigned int max_exponent)
+{
+	unsigned int interval;
+
+	interval = fls(desc_interval) - 1;
+	return clamp_val(interval, min_exponent, max_exponent);
+}
+
+/*
+ * Return the polling interval.
+ *
+ * The polling interval is expressed in "microframes". If controllers's Interval
+ * field is set to N, it will service the endpoint every 2^(Interval)*125us.
+ */
+static unsigned int cdnsp_get_endpoint_interval(struct usb_gadget *g,
+						struct cdnsp_ep *pep)
+{
+	unsigned int interval = 0;
+
+	switch (g->speed) {
+	case USB_SPEED_HIGH:
+	case USB_SPEED_SUPER_PLUS:
+	case USB_SPEED_SUPER:
+		if (usb_endpoint_xfer_int(pep->endpoint.desc) ||
+		    usb_endpoint_xfer_isoc(pep->endpoint.desc))
+			interval = cdnsp_parse_exponent_interval(g, pep);
+		break;
+	case USB_SPEED_FULL:
+		if (usb_endpoint_xfer_isoc(pep->endpoint.desc)) {
+			interval = cdnsp_parse_exponent_interval(g, pep);
+		} else if (usb_endpoint_xfer_int(pep->endpoint.desc)) {
+			interval = pep->endpoint.desc->bInterval << 3;
+			interval = cdnsp_microframes_to_exponent(g, pep,
+								 interval,
+								 3, 10);
+		}
+
+		break;
+	default:
+		WARN_ON(1);
+	}
+
+	return interval;
+}
+
+/*
+ * The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps.
+ * High speed endpoint descriptors can define "the number of additional
+ * transaction opportunities per microframe", but that goes in the Max Burst
+ * endpoint context field.
+ */
+static u32 cdnsp_get_endpoint_mult(struct usb_gadget *g, struct cdnsp_ep *pep)
+{
+	if (g->speed < USB_SPEED_SUPER ||
+	    !usb_endpoint_xfer_isoc(pep->endpoint.desc))
+		return 0;
+
+	return pep->endpoint.comp_desc->bmAttributes;
+}
+
+static u32 cdnsp_get_endpoint_max_burst(struct usb_gadget *g,
+					struct cdnsp_ep *pep)
+{
+	/* Super speed and Plus have max burst in ep companion desc */
+	if (g->speed >= USB_SPEED_SUPER)
+		return pep->endpoint.comp_desc->bMaxBurst;
+
+	if (g->speed == USB_SPEED_HIGH &&
+	    (usb_endpoint_xfer_isoc(pep->endpoint.desc) ||
+	     usb_endpoint_xfer_int(pep->endpoint.desc)))
+		return (usb_endpoint_maxp(pep->endpoint.desc) & 0x1800) >> 11;
+
+	return 0;
+}
+
+static u32 cdnsp_get_endpoint_type(const struct usb_endpoint_descriptor *desc)
+{
+	int in;
+
+	in = usb_endpoint_dir_in(desc);
+
+	switch (usb_endpoint_type(desc)) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		return CTRL_EP;
+	case USB_ENDPOINT_XFER_BULK:
+		return in ? BULK_IN_EP : BULK_OUT_EP;
+	case USB_ENDPOINT_XFER_ISOC:
+		return in ? ISOC_IN_EP : ISOC_OUT_EP;
+	case USB_ENDPOINT_XFER_INT:
+		return in ? INT_IN_EP : INT_OUT_EP;
+	}
+
+	return 0;
+}
+
+/*
+ * Return the maximum endpoint service interval time (ESIT) payload.
+ * Basically, this is the maxpacket size, multiplied by the burst size
+ * and mult size.
+ */
+static u32 cdnsp_get_max_esit_payload(struct usb_gadget *g,
+				      struct cdnsp_ep *pep)
+{
+	int max_packet;
+	int max_burst;
+
+	/* Only applies for interrupt or isochronous endpoints*/
+	if (usb_endpoint_xfer_control(pep->endpoint.desc) ||
+	    usb_endpoint_xfer_bulk(pep->endpoint.desc))
+		return 0;
+
+	/* SuperSpeedPlus Isoc ep sending over 48k per EIST. */
+	if (g->speed >= USB_SPEED_SUPER_PLUS &&
+	    USB_SS_SSP_ISOC_COMP(pep->endpoint.desc->bmAttributes))
+		return le32_to_cpu(pep->endpoint.comp_desc->wBytesPerInterval);
+	/* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */
+	else if (g->speed >= USB_SPEED_SUPER)
+		return le16_to_cpu(pep->endpoint.comp_desc->wBytesPerInterval);
+
+	max_packet = usb_endpoint_maxp(pep->endpoint.desc);
+	max_burst = usb_endpoint_maxp_mult(pep->endpoint.desc);
+
+	/* A 0 in max burst means 1 transfer per ESIT */
+	return max_packet * max_burst;
+}
+
+int cdnsp_endpoint_init(struct cdnsp_device *pdev,
+			struct cdnsp_ep *pep,
+			gfp_t mem_flags)
+{
+	enum cdnsp_ring_type ring_type;
+	struct cdnsp_ep_ctx *ep_ctx;
+	unsigned int err_count = 0;
+	unsigned int avg_trb_len;
+	unsigned int max_packet;
+	unsigned int max_burst;
+	unsigned int interval;
+	u32 max_esit_payload;
+	unsigned int mult;
+	u32 endpoint_type;
+	int ret;
+
+	ep_ctx = pep->in_ctx;
+
+	endpoint_type = cdnsp_get_endpoint_type(pep->endpoint.desc);
+	if (!endpoint_type)
+		return -EINVAL;
+
+	ring_type = usb_endpoint_type(pep->endpoint.desc);
+
+	/*
+	 * Get values to fill the endpoint context, mostly from ep descriptor.
+	 * The average TRB buffer length for bulk endpoints is unclear as we
+	 * have no clue on scatter gather list entry size. For Isoc and Int,
+	 * set it to max available.
+	 */
+	max_esit_payload = cdnsp_get_max_esit_payload(&pdev->gadget, pep);
+	interval = cdnsp_get_endpoint_interval(&pdev->gadget, pep);
+	mult = cdnsp_get_endpoint_mult(&pdev->gadget, pep);
+	max_packet = usb_endpoint_maxp(pep->endpoint.desc);
+	max_burst = cdnsp_get_endpoint_max_burst(&pdev->gadget, pep);
+	avg_trb_len = max_esit_payload;
+
+	/* Allow 3 retries for everything but isoc, set CErr = 3. */
+	if (!usb_endpoint_xfer_isoc(pep->endpoint.desc))
+		err_count = 3;
+	if (usb_endpoint_xfer_bulk(pep->endpoint.desc) &&
+	    pdev->gadget.speed == USB_SPEED_HIGH)
+		max_packet = 512;
+	/* Controller spec indicates that ctrl ep avg TRB Length should be 8. */
+	if (usb_endpoint_xfer_control(pep->endpoint.desc))
+		avg_trb_len = 8;
+
+	/* Set up the endpoint ring. */
+	pep->ring = cdnsp_ring_alloc(pdev, 2, ring_type, max_packet, mem_flags);
+	pep->skip = false;
+
+	/* Fill the endpoint context */
+	ep_ctx->ep_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_HI(max_esit_payload) |
+				EP_INTERVAL(interval) | EP_MULT(mult));
+	ep_ctx->ep_info2 = cpu_to_le32(EP_TYPE(endpoint_type) |
+				MAX_PACKET(max_packet) | MAX_BURST(max_burst) |
+				ERROR_COUNT(err_count));
+	ep_ctx->deq = cpu_to_le64(pep->ring->first_seg->dma |
+				  pep->ring->cycle_state);
+
+	ep_ctx->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) |
+				EP_AVG_TRB_LENGTH(avg_trb_len));
+
+	if (usb_endpoint_xfer_bulk(pep->endpoint.desc) &&
+	    pdev->gadget.speed > USB_SPEED_HIGH) {
+		ret = cdnsp_alloc_streams(pdev, pep);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+void cdnsp_endpoint_zero(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	pep->in_ctx->ep_info = 0;
+	pep->in_ctx->ep_info2 = 0;
+	pep->in_ctx->deq = 0;
+	pep->in_ctx->tx_info = 0;
+}
+
+static int cdnsp_alloc_erst(struct cdnsp_device *pdev,
+			    struct cdnsp_ring *evt_ring,
+			    struct cdnsp_erst *erst,
+			    gfp_t flags)
+{
+	struct cdnsp_erst_entry *entry;
+	struct cdnsp_segment *seg;
+	unsigned int val;
+	size_t size;
+
+	size = sizeof(struct cdnsp_erst_entry) * evt_ring->num_segs;
+	erst->entries = dma_alloc_coherent(pdev->dev, size,
+					   &erst->erst_dma_addr, flags);
+	if (!erst->entries)
+		return -ENOMEM;
+
+	erst->num_entries = evt_ring->num_segs;
+
+	seg = evt_ring->first_seg;
+	for (val = 0; val < evt_ring->num_segs; val++) {
+		entry = &erst->entries[val];
+		entry->seg_addr = cpu_to_le64(seg->dma);
+		entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT);
+		entry->rsvd = 0;
+		seg = seg->next;
+	}
+
+	return 0;
+}
+
+static void cdnsp_free_erst(struct cdnsp_device *pdev, struct cdnsp_erst *erst)
+{
+	size_t size = sizeof(struct cdnsp_erst_entry) * (erst->num_entries);
+	struct device *dev = pdev->dev;
+
+	if (erst->entries)
+		dma_free_coherent(dev, size, erst->entries,
+				  erst->erst_dma_addr);
+
+	erst->entries = NULL;
+}
+
+void cdnsp_mem_cleanup(struct cdnsp_device *pdev)
+{
+	struct device *dev = pdev->dev;
+
+	cdnsp_free_priv_device(pdev);
+	cdnsp_free_erst(pdev, &pdev->erst);
+
+	if (pdev->event_ring)
+		cdnsp_ring_free(pdev, pdev->event_ring);
+
+	pdev->event_ring = NULL;
+
+	if (pdev->cmd_ring)
+		cdnsp_ring_free(pdev, pdev->cmd_ring);
+
+	pdev->cmd_ring = NULL;
+
+	dma_pool_destroy(pdev->segment_pool);
+	pdev->segment_pool = NULL;
+	dma_pool_destroy(pdev->device_pool);
+	pdev->device_pool = NULL;
+
+	if (pdev->dcbaa)
+		dma_free_coherent(dev, sizeof(*pdev->dcbaa),
+				  pdev->dcbaa, pdev->dcbaa->dma);
+
+	pdev->dcbaa = NULL;
+
+	pdev->usb2_port.exist = 0;
+	pdev->usb3_port.exist = 0;
+	pdev->usb2_port.port_num = 0;
+	pdev->usb3_port.port_num = 0;
+	pdev->active_port = NULL;
+}
+
+static void cdnsp_set_event_deq(struct cdnsp_device *pdev)
+{
+	dma_addr_t deq;
+	u64 temp;
+
+	deq = cdnsp_trb_virt_to_dma(pdev->event_ring->deq_seg,
+				    pdev->event_ring->dequeue);
+
+	/* Update controller event ring dequeue pointer */
+	temp = cdnsp_read_64(&pdev->ir_set->erst_dequeue);
+	temp &= ERST_PTR_MASK;
+
+	/*
+	 * Don't clear the EHB bit (which is RW1C) because
+	 * there might be more events to service.
+	 */
+	temp &= ~ERST_EHB;
+
+	cdnsp_write_64(((u64)deq & (u64)~ERST_PTR_MASK) | temp,
+		       &pdev->ir_set->erst_dequeue);
+}
+
+static void cdnsp_add_in_port(struct cdnsp_device *pdev,
+			      struct cdnsp_port *port,
+			      __le32 __iomem *addr)
+{
+	u32 temp, port_offset;
+
+	temp = readl(addr);
+	port->maj_rev = CDNSP_EXT_PORT_MAJOR(temp);
+	port->min_rev = CDNSP_EXT_PORT_MINOR(temp);
+
+	/* Port offset and count in the third dword.*/
+	temp = readl(addr + 2);
+	port_offset = CDNSP_EXT_PORT_OFF(temp);
+
+	port->port_num = port_offset;
+	port->exist = 1;
+}
+
+/*
+ * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that
+ * specify what speeds each port is supposed to be.
+ */
+static int cdnsp_setup_port_arrays(struct cdnsp_device *pdev, gfp_t flags)
+{
+	void __iomem *base;
+	u32 offset;
+	int i;
+
+	base = &pdev->cap_regs->hc_capbase;
+	offset = cdnsp_find_next_ext_cap(base, 0,
+					 EXT_CAP_CFG_DEV_20PORT_CAP_ID);
+	pdev->port20_regs = base + offset;
+
+	offset = cdnsp_find_next_ext_cap(base, 0, D_XEC_CFG_3XPORT_CAP);
+	pdev->port3x_regs =  base + offset;
+
+	offset = 0;
+	base = &pdev->cap_regs->hc_capbase;
+
+	/* Driver expects max 2 extended protocol capability. */
+	for (i = 0; i < 2; i++) {
+		u32 temp;
+
+		offset = cdnsp_find_next_ext_cap(base, offset,
+						 EXT_CAPS_PROTOCOL);
+		temp = readl(base + offset);
+
+		if (CDNSP_EXT_PORT_MAJOR(temp) == 0x03 &&
+		    !pdev->usb3_port.port_num)
+			cdnsp_add_in_port(pdev, &pdev->usb3_port,
+					  base + offset);
+
+		if (CDNSP_EXT_PORT_MAJOR(temp) == 0x02 &&
+		    !pdev->usb2_port.port_num)
+			cdnsp_add_in_port(pdev, &pdev->usb2_port,
+					  base + offset);
+	}
+
+	if (!pdev->usb2_port.exist || !pdev->usb3_port.exist) {
+		dev_err(pdev->dev, "Error: Only one port detected\n");
+		return -ENODEV;
+	}
+
+	pdev->usb2_port.regs = (struct cdnsp_port_regs *)
+			       (&pdev->op_regs->port_reg_base + NUM_PORT_REGS *
+				(pdev->usb2_port.port_num - 1));
+
+	pdev->usb3_port.regs = (struct cdnsp_port_regs *)
+			       (&pdev->op_regs->port_reg_base + NUM_PORT_REGS *
+				(pdev->usb3_port.port_num - 1));
+
+	return 0;
+}
+
+/*
+ * Initialize memory for CDNSP (one-time init).
+ *
+ * Program the PAGESIZE register, initialize the device context array, create
+ * device contexts, set up a command ring segment, create event
+ * ring (one for now).
+ */
+int cdnsp_mem_init(struct cdnsp_device *pdev, gfp_t flags)
+{
+	struct device *dev = pdev->dev;
+	int ret = -ENOMEM;
+	unsigned int val;
+	dma_addr_t dma;
+	u32 page_size;
+	u64 val_64;
+
+	/*
+	 * Use 4K pages, since that's common and the minimum the
+	 * controller supports
+	 */
+	page_size = 1 << 12;
+
+	val = readl(&pdev->op_regs->config_reg);
+	val |= ((val & ~MAX_DEVS) | CDNSP_DEV_MAX_SLOTS) | CONFIG_U3E;
+	writel(val, &pdev->op_regs->config_reg);
+
+	/*
+	 * Doorbell array must be physically contiguous
+	 * and 64-byte (cache line) aligned.
+	 */
+	pdev->dcbaa = dma_alloc_coherent(dev, sizeof(*pdev->dcbaa),
+					 &dma, GFP_KERNEL);
+	if (!pdev->dcbaa)
+		goto mem_init_fail;
+
+	memset(pdev->dcbaa, 0, sizeof(*pdev->dcbaa));
+	pdev->dcbaa->dma = dma;
+
+	cdnsp_write_64(dma, &pdev->op_regs->dcbaa_ptr);
+
+	/*
+	 * Initialize the ring segment pool.  The ring must be a contiguous
+	 * structure comprised of TRBs. The TRBs must be 16 byte aligned,
+	 * however, the command ring segment needs 64-byte aligned segments
+	 * and our use of dma addresses in the trb_address_map radix tree needs
+	 * TRB_SEGMENT_SIZE alignment, so driver pick the greater alignment
+	 * need.
+	 */
+	pdev->segment_pool = dma_pool_create("CDNSP ring segments", dev,
+					     TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE,
+					     page_size);
+
+	pdev->device_pool = dma_pool_create("CDNSP input/output contexts", dev,
+					    CDNSP_CTX_SIZE, 64, page_size);
+
+	if (!pdev->segment_pool || !pdev->device_pool)
+		goto mem_init_fail;
+
+	/* Set up the command ring to have one segments for now. */
+	pdev->cmd_ring = cdnsp_ring_alloc(pdev, 1, TYPE_COMMAND, 0, flags);
+	if (!pdev->cmd_ring)
+		goto mem_init_fail;
+
+	/* Set the address in the Command Ring Control register */
+	val_64 = cdnsp_read_64(&pdev->op_regs->cmd_ring);
+	val_64 = (val_64 & (u64)CMD_RING_RSVD_BITS) |
+		 (pdev->cmd_ring->first_seg->dma & (u64)~CMD_RING_RSVD_BITS) |
+		 pdev->cmd_ring->cycle_state;
+	cdnsp_write_64(val_64, &pdev->op_regs->cmd_ring);
+
+	val = readl(&pdev->cap_regs->db_off);
+	val &= DBOFF_MASK;
+	pdev->dba = (void __iomem *)pdev->cap_regs + val;
+
+	/* Set ir_set to interrupt register set 0 */
+	pdev->ir_set = &pdev->run_regs->ir_set[0];
+
+	/*
+	 * Event ring setup: Allocate a normal ring, but also setup
+	 * the event ring segment table (ERST).
+	 */
+	pdev->event_ring = cdnsp_ring_alloc(pdev, ERST_NUM_SEGS, TYPE_EVENT,
+					    0, flags);
+	if (!pdev->event_ring)
+		goto mem_init_fail;
+
+	ret = cdnsp_alloc_erst(pdev, pdev->event_ring, &pdev->erst, flags);
+	if (ret)
+		goto mem_init_fail;
+
+	/* Set ERST count with the number of entries in the segment table. */
+	val = readl(&pdev->ir_set->erst_size);
+	val &= ERST_SIZE_MASK;
+	val |= ERST_NUM_SEGS;
+	writel(val, &pdev->ir_set->erst_size);
+
+	/* Set the segment table base address. */
+	val_64 = cdnsp_read_64(&pdev->ir_set->erst_base);
+	val_64 &= ERST_PTR_MASK;
+	val_64 |= (pdev->erst.erst_dma_addr & (u64)~ERST_PTR_MASK);
+	cdnsp_write_64(val_64, &pdev->ir_set->erst_base);
+
+	/* Set the event ring dequeue address. */
+	cdnsp_set_event_deq(pdev);
+
+	ret = cdnsp_setup_port_arrays(pdev, flags);
+	if (ret)
+		goto mem_init_fail;
+
+	ret = cdnsp_alloc_priv_device(pdev, GFP_ATOMIC);
+	if (ret) {
+		dev_err(pdev->dev,
+			"Could not allocate cdnsp_device data structures\n");
+		goto mem_init_fail;
+	}
+
+	return 0;
+
+mem_init_fail:
+	dev_err(pdev->dev, "Couldn't initialize memory\n");
+	cdnsp_halt(pdev);
+	cdnsp_reset(pdev);
+	cdnsp_mem_cleanup(pdev);
+
+	return ret;
+}
+
diff --git a/drivers/usb/cdns3/cdnsp-pci.c b/drivers/usb/cdns3/cdnsp-pci.c
new file mode 100644
index 000000000000..283ff5ed5f63
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-pci.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence PCI Glue driver.
+ *
+ * Copyright (C) 2019 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+
+#include "core.h"
+#include "gadget-export.h"
+
+#define PCI_BAR_HOST		0
+#define PCI_BAR_OTG		0
+#define PCI_BAR_DEV		2
+
+#define PCI_DEV_FN_HOST_DEVICE	0
+#define PCI_DEV_FN_OTG		1
+
+#define PCI_DRIVER_NAME		"cdns-pci-usbssp"
+#define PLAT_DRIVER_NAME	"cdns-usbssp"
+
+#define CDNS_VENDOR_ID		0x17cd
+#define CDNS_DEVICE_ID		0x0100
+#define CDNS_DRD_IF		(PCI_CLASS_SERIAL_USB << 8 | 0x80)
+
+static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)
+{
+	struct pci_dev *func;
+
+	/*
+	 * Gets the second function.
+	 * It's little tricky, but this platform has two function.
+	 * The fist keeps resources for Host/Device while the second
+	 * keeps resources for DRD/OTG.
+	 */
+	func = pci_get_device(pdev->vendor, pdev->device, NULL);
+	if (!func)
+		return NULL;
+
+	if (func->devfn == pdev->devfn) {
+		func = pci_get_device(pdev->vendor, pdev->device, func);
+		if (!func)
+			return NULL;
+	}
+
+	return func;
+}
+
+static int cdnsp_pci_probe(struct pci_dev *pdev,
+			   const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct pci_dev *func;
+	struct resource *res;
+	struct cdns *cdnsp;
+	int ret;
+
+	/*
+	 * For GADGET/HOST PCI (devfn) function number is 0,
+	 * for OTG PCI (devfn) function number is 1.
+	 */
+	if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
+		    pdev->devfn != PCI_DEV_FN_OTG))
+		return -EINVAL;
+
+	func = cdnsp_get_second_fun(pdev);
+	if (!func)
+		return -EINVAL;
+
+	if (func->class == PCI_CLASS_SERIAL_USB_XHCI ||
+	    pdev->class == PCI_CLASS_SERIAL_USB_XHCI) {
+		ret = -EINVAL;
+		goto put_pci;
+	}
+
+	ret = pcim_enable_device(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret);
+		goto put_pci;
+	}
+
+	pci_set_master(pdev);
+	if (pci_is_enabled(func)) {
+		cdnsp = pci_get_drvdata(func);
+	} else {
+		cdnsp = kzalloc(sizeof(*cdnsp), GFP_KERNEL);
+		if (!cdnsp) {
+			ret = -ENOMEM;
+			goto disable_pci;
+		}
+	}
+
+	/* For GADGET device function number is 0. */
+	if (pdev->devfn == 0) {
+		resource_size_t rsrc_start, rsrc_len;
+
+		/* Function 0: host(BAR_0) + device(BAR_1).*/
+		dev_dbg(dev, "Initialize resources\n");
+		rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);
+		rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);
+		res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev");
+		if (!res) {
+			dev_dbg(dev, "controller already in use\n");
+			ret = -EBUSY;
+			goto free_cdnsp;
+		}
+
+		cdnsp->dev_regs = devm_ioremap(dev, rsrc_start, rsrc_len);
+		if (!cdnsp->dev_regs) {
+			dev_dbg(dev, "error mapping memory\n");
+			ret = -EFAULT;
+			goto free_cdnsp;
+		}
+
+		cdnsp->dev_irq = pdev->irq;
+		dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n",
+			&rsrc_start);
+
+		res = &cdnsp->xhci_res[0];
+		res->start = pci_resource_start(pdev, PCI_BAR_HOST);
+		res->end = pci_resource_end(pdev, PCI_BAR_HOST);
+		res->name = "xhci";
+		res->flags = IORESOURCE_MEM;
+		dev_dbg(dev, "USBSS-XHCI physical base addr: %pa\n",
+			&res->start);
+
+		/* Interrupt for XHCI, */
+		res = &cdnsp->xhci_res[1];
+		res->start = pdev->irq;
+		res->name = "host";
+		res->flags = IORESOURCE_IRQ;
+	} else {
+		res = &cdnsp->otg_res;
+		res->start = pci_resource_start(pdev, PCI_BAR_OTG);
+		res->end =   pci_resource_end(pdev, PCI_BAR_OTG);
+		res->name = "otg";
+		res->flags = IORESOURCE_MEM;
+		dev_dbg(dev, "CDNSP-DRD physical base addr: %pa\n",
+			&res->start);
+
+		/* Interrupt for OTG/DRD. */
+		cdnsp->otg_irq = pdev->irq;
+	}
+
+	if (pci_is_enabled(func)) {
+		cdnsp->dev = dev;
+		cdnsp->gadget_init = cdnsp_gadget_init;
+
+		ret = cdns_init(cdnsp);
+		if (ret)
+			goto free_cdnsp;
+	}
+
+	pci_set_drvdata(pdev, cdnsp);
+
+	device_wakeup_enable(&pdev->dev);
+	if (pci_dev_run_wake(pdev))
+		pm_runtime_put_noidle(&pdev->dev);
+
+	return 0;
+
+free_cdnsp:
+	if (!pci_is_enabled(func))
+		kfree(cdnsp);
+
+disable_pci:
+	pci_disable_device(pdev);
+
+put_pci:
+	pci_dev_put(func);
+
+	return ret;
+}
+
+static void cdnsp_pci_remove(struct pci_dev *pdev)
+{
+	struct cdns *cdnsp;
+	struct pci_dev *func;
+
+	func = cdnsp_get_second_fun(pdev);
+	cdnsp = (struct cdns *)pci_get_drvdata(pdev);
+
+	if (pci_dev_run_wake(pdev))
+		pm_runtime_get_noresume(&pdev->dev);
+
+	if (!pci_is_enabled(func)) {
+		kfree(cdnsp);
+		goto pci_put;
+	}
+
+	cdns_remove(cdnsp);
+
+pci_put:
+	pci_dev_put(func);
+}
+
+static int __maybe_unused cdnsp_pci_suspend(struct device *dev)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+
+	return cdns_suspend(cdns);
+}
+
+static int __maybe_unused cdnsp_pci_resume(struct device *dev)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&cdns->lock, flags);
+	ret = cdns_resume(cdns, 1);
+	spin_unlock_irqrestore(&cdns->lock, flags);
+
+	return ret;
+}
+
+static const struct dev_pm_ops cdnsp_pci_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(cdnsp_pci_suspend, cdnsp_pci_resume)
+};
+
+static const struct pci_device_id cdnsp_pci_ids[] = {
+	{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
+	  PCI_CLASS_SERIAL_USB_DEVICE, PCI_ANY_ID },
+	{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
+	  CDNS_DRD_IF, PCI_ANY_ID },
+	{ 0, }
+};
+
+static struct pci_driver cdnsp_pci_driver = {
+	.name = "cdnsp-pci",
+	.id_table = &cdnsp_pci_ids[0],
+	.probe = cdnsp_pci_probe,
+	.remove = cdnsp_pci_remove,
+	.driver = {
+		.pm = &cdnsp_pci_pm_ops,
+	}
+};
+
+module_pci_driver(cdnsp_pci_driver);
+MODULE_DEVICE_TABLE(pci, cdnsp_pci_ids);
+
+MODULE_ALIAS("pci:cdnsp");
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence CDNSP PCI driver");
+
diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
new file mode 100644
index 000000000000..a28faca41a8f
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -0,0 +1,2376 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ * Code based on Linux XHCI driver.
+ * Origin: Copyright (C) 2008 Intel Corp
+ */
+
+/*
+ * Ring initialization rules:
+ * 1. Each segment is initialized to zero, except for link TRBs.
+ * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or
+ *    Consumer Cycle State (CCS), depending on ring function.
+ * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
+ *
+ * Ring behavior rules:
+ * 1. A ring is empty if enqueue == dequeue. This means there will always be at
+ *    least one free TRB in the ring. This is useful if you want to turn that
+ *    into a link TRB and expand the ring.
+ * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
+ *    link TRB, then load the pointer with the address in the link TRB. If the
+ *    link TRB had its toggle bit set, you may need to update the ring cycle
+ *    state (see cycle bit rules). You may have to do this multiple times
+ *    until you reach a non-link TRB.
+ * 3. A ring is full if enqueue++ (for the definition of increment above)
+ *    equals the dequeue pointer.
+ *
+ * Cycle bit rules:
+ * 1. When a consumer increments a dequeue pointer and encounters a toggle bit
+ *    in a link TRB, it must toggle the ring cycle state.
+ * 2. When a producer increments an enqueue pointer and encounters a toggle bit
+ *    in a link TRB, it must toggle the ring cycle state.
+ *
+ * Producer rules:
+ * 1. Check if ring is full before you enqueue.
+ * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
+ *    Update enqueue pointer between each write (which may update the ring
+ *    cycle state).
+ * 3. Notify consumer. If SW is producer, it rings the doorbell for command
+ *    and endpoint rings. If controller is the producer for the event ring,
+ *    and it generates an interrupt according to interrupt modulation rules.
+ *
+ * Consumer rules:
+ * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state,
+ *    the TRB is owned by the consumer.
+ * 2. Update dequeue pointer (which may update the ring cycle state) and
+ *    continue processing TRBs until you reach a TRB which is not owned by you.
+ * 3. Notify the producer. SW is the consumer for the event ring, and it
+ *    updates event ring dequeue pointer. Controller is the consumer for the
+ *    command and endpoint rings; it generates events on the event ring
+ *    for these.
+ */
+
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+
+#include "cdnsp-gadget.h"
+
+/*
+ * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
+ * address of the TRB.
+ */
+dma_addr_t cdnsp_trb_virt_to_dma(struct cdnsp_segment *seg,
+				 union cdnsp_trb *trb)
+{
+	unsigned long segment_offset = trb - seg->trbs;
+
+	if (trb < seg->trbs || segment_offset >= TRBS_PER_SEGMENT)
+		return 0;
+
+	return seg->dma + (segment_offset * sizeof(*trb));
+}
+
+static bool cdnsp_trb_is_noop(union cdnsp_trb *trb)
+{
+	return TRB_TYPE_NOOP_LE32(trb->generic.field[3]);
+}
+
+static bool cdnsp_trb_is_link(union cdnsp_trb *trb)
+{
+	return TRB_TYPE_LINK_LE32(trb->link.control);
+}
+
+bool cdnsp_last_trb_on_seg(struct cdnsp_segment *seg, union cdnsp_trb *trb)
+{
+	return trb == &seg->trbs[TRBS_PER_SEGMENT - 1];
+}
+
+bool cdnsp_last_trb_on_ring(struct cdnsp_ring *ring,
+			    struct cdnsp_segment *seg,
+			    union cdnsp_trb *trb)
+{
+	return cdnsp_last_trb_on_seg(seg, trb) && (seg->next == ring->first_seg);
+}
+
+static bool cdnsp_link_trb_toggles_cycle(union cdnsp_trb *trb)
+{
+	return le32_to_cpu(trb->link.control) & LINK_TOGGLE;
+}
+
+static void cdnsp_trb_to_noop(union cdnsp_trb *trb, u32 noop_type)
+{
+	if (cdnsp_trb_is_link(trb)) {
+		/* Unchain chained link TRBs. */
+		trb->link.control &= cpu_to_le32(~TRB_CHAIN);
+	} else {
+		trb->generic.field[0] = 0;
+		trb->generic.field[1] = 0;
+		trb->generic.field[2] = 0;
+		/* Preserve only the cycle bit of this TRB. */
+		trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE);
+		trb->generic.field[3] |= cpu_to_le32(TRB_TYPE(noop_type));
+	}
+}
+
+/*
+ * Updates trb to point to the next TRB in the ring, and updates seg if the next
+ * TRB is in a new segment. This does not skip over link TRBs, and it does not
+ * effect the ring dequeue or enqueue pointers.
+ */
+static void cdnsp_next_trb(struct cdnsp_device *pdev,
+			   struct cdnsp_ring *ring,
+			   struct cdnsp_segment **seg,
+			   union cdnsp_trb **trb)
+{
+	if (cdnsp_trb_is_link(*trb)) {
+		*seg = (*seg)->next;
+		*trb = ((*seg)->trbs);
+	} else {
+		(*trb)++;
+	}
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs. That would be dumb and this would loop.
+ */
+void cdnsp_inc_deq(struct cdnsp_device *pdev, struct cdnsp_ring *ring)
+{
+	/* event ring doesn't have link trbs, check for last trb. */
+	if (ring->type == TYPE_EVENT) {
+		if (!cdnsp_last_trb_on_seg(ring->deq_seg, ring->dequeue)) {
+			ring->dequeue++;
+			return;
+		}
+
+		if (cdnsp_last_trb_on_ring(ring, ring->deq_seg, ring->dequeue))
+			ring->cycle_state ^= 1;
+
+		ring->deq_seg = ring->deq_seg->next;
+		ring->dequeue = ring->deq_seg->trbs;
+		return;
+	}
+
+	/* All other rings have link trbs. */
+	if (!cdnsp_trb_is_link(ring->dequeue)) {
+		ring->dequeue++;
+		ring->num_trbs_free++;
+	}
+	while (cdnsp_trb_is_link(ring->dequeue)) {
+		ring->deq_seg = ring->deq_seg->next;
+		ring->dequeue = ring->deq_seg->trbs;
+	}
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs. That would be dumb and this would loop.
+ *
+ * If we've just enqueued a TRB that is in the middle of a TD (meaning the
+ * chain bit is set), then set the chain bit in all the following link TRBs.
+ * If we've enqueued the last TRB in a TD, make sure the following link TRBs
+ * have their chain bit cleared (so that each Link TRB is a separate TD).
+ *
+ * @more_trbs_coming:	Will you enqueue more TRBs before ringing the doorbell.
+ */
+static void cdnsp_inc_enq(struct cdnsp_device *pdev,
+			  struct cdnsp_ring *ring,
+			  bool more_trbs_coming)
+{
+	union cdnsp_trb *next;
+	u32 chain;
+
+	chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
+
+	/* If this is not event ring, there is one less usable TRB. */
+	if (!cdnsp_trb_is_link(ring->enqueue))
+		ring->num_trbs_free--;
+	next = ++(ring->enqueue);
+
+	/* Update the dequeue pointer further if that was a link TRB */
+	while (cdnsp_trb_is_link(next)) {
+		/*
+		 * If the caller doesn't plan on enqueuing more TDs before
+		 * ringing the doorbell, then we don't want to give the link TRB
+		 * to the hardware just yet. We'll give the link TRB back in
+		 * cdnsp_prepare_ring() just before we enqueue the TD at the
+		 * top of the ring.
+		 */
+		if (!chain && !more_trbs_coming)
+			break;
+
+		next->link.control &= cpu_to_le32(~TRB_CHAIN);
+		next->link.control |= cpu_to_le32(chain);
+
+		/* Give this link TRB to the hardware */
+		wmb();
+		next->link.control ^= cpu_to_le32(TRB_CYCLE);
+
+		/* Toggle the cycle bit after the last ring segment. */
+		if (cdnsp_link_trb_toggles_cycle(next))
+			ring->cycle_state ^= 1;
+
+		ring->enq_seg = ring->enq_seg->next;
+		ring->enqueue = ring->enq_seg->trbs;
+		next = ring->enqueue;
+	}
+}
+
+/*
+ * Check to see if there's room to enqueue num_trbs on the ring and make sure
+ * enqueue pointer will not advance into dequeue segment.
+ */
+static bool cdnsp_room_on_ring(struct cdnsp_device *pdev,
+			       struct cdnsp_ring *ring,
+			       unsigned int num_trbs)
+{
+	int num_trbs_in_deq_seg;
+
+	if (ring->num_trbs_free < num_trbs)
+		return false;
+
+	if (ring->type != TYPE_COMMAND && ring->type != TYPE_EVENT) {
+		num_trbs_in_deq_seg = ring->dequeue - ring->deq_seg->trbs;
+
+		if (ring->num_trbs_free < num_trbs + num_trbs_in_deq_seg)
+			return false;
+	}
+
+	return true;
+}
+
+/*
+ * Workaround for L1: controller has issue with resuming from L1 after
+ * setting doorbell for endpoint during L1 state. This function forces
+ * resume signal in such case.
+ */
+static void cdnsp_force_l0_go(struct cdnsp_device *pdev)
+{
+	if (pdev->active_port == &pdev->usb2_port && pdev->gadget.lpm_capable)
+		cdnsp_set_link_state(pdev, &pdev->active_port->regs->portsc, XDEV_U0);
+}
+
+/* Ring the doorbell after placing a command on the ring. */
+void cdnsp_ring_cmd_db(struct cdnsp_device *pdev)
+{
+	writel(DB_VALUE_CMD, &pdev->dba->cmd_db);
+}
+
+/*
+ * Ring the doorbell after placing a transfer on the ring.
+ * Returns true if doorbell was set, otherwise false.
+ */
+static bool cdnsp_ring_ep_doorbell(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep,
+				   unsigned int stream_id)
+{
+	__le32 __iomem *reg_addr = &pdev->dba->ep_db;
+	unsigned int ep_state = pep->ep_state;
+	unsigned int db_value;
+
+	/*
+	 * Don't ring the doorbell for this endpoint if endpoint is halted or
+	 * disabled.
+	 */
+	if (ep_state & EP_HALTED || !(ep_state & EP_ENABLED))
+		return false;
+
+	/* For stream capable endpoints driver can ring doorbell only twice. */
+	if (pep->ep_state & EP_HAS_STREAMS) {
+		if (pep->stream_info.drbls_count >= 2)
+			return false;
+
+		pep->stream_info.drbls_count++;
+	}
+
+	pep->ep_state &= ~EP_STOPPED;
+
+	if (pep->idx == 0 && pdev->ep0_stage == CDNSP_DATA_STAGE &&
+	    !pdev->ep0_expect_in)
+		db_value = DB_VALUE_EP0_OUT(pep->idx, stream_id);
+	else
+		db_value = DB_VALUE(pep->idx, stream_id);
+
+	writel(db_value, reg_addr);
+
+	cdnsp_force_l0_go(pdev);
+
+	/* Doorbell was set. */
+	return true;
+}
+
+/*
+ * Get the right ring for the given pep and stream_id.
+ * If the endpoint supports streams, boundary check the USB request's stream ID.
+ * If the endpoint doesn't support streams, return the singular endpoint ring.
+ */
+static struct cdnsp_ring *cdnsp_get_transfer_ring(struct cdnsp_device *pdev,
+						  struct cdnsp_ep *pep,
+						  unsigned int stream_id)
+{
+	if (!(pep->ep_state & EP_HAS_STREAMS))
+		return pep->ring;
+
+	if (stream_id == 0 || stream_id >= pep->stream_info.num_streams) {
+		dev_err(pdev->dev, "ERR: %s ring doesn't exist for SID: %d.\n",
+			pep->name, stream_id);
+		return NULL;
+	}
+
+	return pep->stream_info.stream_rings[stream_id];
+}
+
+static struct cdnsp_ring *
+	cdnsp_request_to_transfer_ring(struct cdnsp_device *pdev,
+				       struct cdnsp_request *preq)
+{
+	return cdnsp_get_transfer_ring(pdev, preq->pep,
+				       preq->request.stream_id);
+}
+
+/* Ring the doorbell for any rings with pending requests. */
+void cdnsp_ring_doorbell_for_active_rings(struct cdnsp_device *pdev,
+					  struct cdnsp_ep *pep)
+{
+	struct cdnsp_stream_info *stream_info;
+	unsigned int stream_id;
+	int ret;
+
+	if (pep->ep_state & EP_DIS_IN_RROGRESS)
+		return;
+
+	/* A ring has pending Request if its TD list is not empty. */
+	if (!(pep->ep_state & EP_HAS_STREAMS) && pep->number) {
+		if (pep->ring && !list_empty(&pep->ring->td_list))
+			cdnsp_ring_ep_doorbell(pdev, pep, 0);
+		return;
+	}
+
+	stream_info = &pep->stream_info;
+
+	for (stream_id = 1; stream_id < stream_info->num_streams; stream_id++) {
+		struct cdnsp_td *td, *td_temp;
+		struct cdnsp_ring *ep_ring;
+
+		if (stream_info->drbls_count >= 2)
+			return;
+
+		ep_ring = cdnsp_get_transfer_ring(pdev, pep, stream_id);
+		if (!ep_ring)
+			continue;
+
+		if (!ep_ring->stream_active || ep_ring->stream_rejected)
+			continue;
+
+		list_for_each_entry_safe(td, td_temp, &ep_ring->td_list,
+					 td_list) {
+			if (td->drbl)
+				continue;
+
+			ret = cdnsp_ring_ep_doorbell(pdev, pep, stream_id);
+			if (ret)
+				td->drbl = 1;
+		}
+	}
+}
+
+/*
+ * Get the hw dequeue pointer controller stopped on, either directly from the
+ * endpoint context, or if streams are in use from the stream context.
+ * The returned hw_dequeue contains the lowest four bits with cycle state
+ * and possible stream context type.
+ */
+static u64 cdnsp_get_hw_deq(struct cdnsp_device *pdev,
+			    unsigned int ep_index,
+			    unsigned int stream_id)
+{
+	struct cdnsp_stream_ctx *st_ctx;
+	struct cdnsp_ep *pep;
+
+	pep = &pdev->eps[stream_id];
+
+	if (pep->ep_state & EP_HAS_STREAMS) {
+		st_ctx = &pep->stream_info.stream_ctx_array[stream_id];
+		return le64_to_cpu(st_ctx->stream_ring);
+	}
+
+	return le64_to_cpu(pep->out_ctx->deq);
+}
+
+/*
+ * Move the controller endpoint ring dequeue pointer past cur_td.
+ * Record the new state of the controller endpoint ring dequeue segment,
+ * dequeue pointer, and new consumer cycle state in state.
+ * Update internal representation of the ring's dequeue pointer.
+ *
+ * We do this in three jumps:
+ *  - First we update our new ring state to be the same as when the
+ *    controller stopped.
+ *  - Then we traverse the ring to find the segment that contains
+ *    the last TRB in the TD. We toggle the controller new cycle state
+ *    when we pass any link TRBs with the toggle cycle bit set.
+ *  - Finally we move the dequeue state one TRB further, toggling the cycle bit
+ *    if we've moved it past a link TRB with the toggle cycle bit set.
+ */
+static void cdnsp_find_new_dequeue_state(struct cdnsp_device *pdev,
+					 struct cdnsp_ep *pep,
+					 unsigned int stream_id,
+					 struct cdnsp_td *cur_td,
+					 struct cdnsp_dequeue_state *state)
+{
+	bool td_last_trb_found = false;
+	struct cdnsp_segment *new_seg;
+	struct cdnsp_ring *ep_ring;
+	union cdnsp_trb *new_deq;
+	bool cycle_found = false;
+	u64 hw_dequeue;
+
+	ep_ring = cdnsp_get_transfer_ring(pdev, pep, stream_id);
+	if (!ep_ring)
+		return;
+
+	/*
+	 * Dig out the cycle state saved by the controller during the
+	 * stop endpoint command.
+	 */
+	hw_dequeue = cdnsp_get_hw_deq(pdev, pep->idx, stream_id);
+	new_seg = ep_ring->deq_seg;
+	new_deq = ep_ring->dequeue;
+	state->new_cycle_state = hw_dequeue & 0x1;
+	state->stream_id = stream_id;
+
+	/*
+	 * We want to find the pointer, segment and cycle state of the new trb
+	 * (the one after current TD's last_trb). We know the cycle state at
+	 * hw_dequeue, so walk the ring until both hw_dequeue and last_trb are
+	 * found.
+	 */
+	do {
+		if (!cycle_found && cdnsp_trb_virt_to_dma(new_seg, new_deq)
+		    == (dma_addr_t)(hw_dequeue & ~0xf)) {
+			cycle_found = true;
+
+			if (td_last_trb_found)
+				break;
+		}
+
+		if (new_deq == cur_td->last_trb)
+			td_last_trb_found = true;
+
+		if (cycle_found && cdnsp_trb_is_link(new_deq) &&
+		    cdnsp_link_trb_toggles_cycle(new_deq))
+			state->new_cycle_state ^= 0x1;
+
+		cdnsp_next_trb(pdev, ep_ring, &new_seg, &new_deq);
+
+		/* Search wrapped around, bail out. */
+		if (new_deq == pep->ring->dequeue) {
+			dev_err(pdev->dev,
+				"Error: Failed finding new dequeue state\n");
+			state->new_deq_seg = NULL;
+			state->new_deq_ptr = NULL;
+			return;
+		}
+
+	} while (!cycle_found || !td_last_trb_found);
+
+	state->new_deq_seg = new_seg;
+	state->new_deq_ptr = new_deq;
+}
+
+/*
+ * flip_cycle means flip the cycle bit of all but the first and last TRB.
+ * (The last TRB actually points to the ring enqueue pointer, which is not part
+ * of this TD.) This is used to remove partially enqueued isoc TDs from a ring.
+ */
+static void cdnsp_td_to_noop(struct cdnsp_device *pdev,
+			     struct cdnsp_ring *ep_ring,
+			     struct cdnsp_td *td,
+			     bool flip_cycle)
+{
+	struct cdnsp_segment *seg = td->start_seg;
+	union cdnsp_trb *trb = td->first_trb;
+
+	while (1) {
+		cdnsp_trb_to_noop(trb, TRB_TR_NOOP);
+
+		/* flip cycle if asked to */
+		if (flip_cycle && trb != td->first_trb && trb != td->last_trb)
+			trb->generic.field[3] ^= cpu_to_le32(TRB_CYCLE);
+
+		if (trb == td->last_trb)
+			break;
+
+		cdnsp_next_trb(pdev, ep_ring, &seg, &trb);
+	}
+}
+
+/*
+ * This TD is defined by the TRBs starting at start_trb in start_seg and ending
+ * at end_trb, which may be in another segment. If the suspect DMA address is a
+ * TRB in this TD, this function returns that TRB's segment. Otherwise it
+ * returns 0.
+ */
+static struct cdnsp_segment *cdnsp_trb_in_td(struct cdnsp_device *pdev,
+					     struct cdnsp_segment *start_seg,
+					     union cdnsp_trb *start_trb,
+					     union cdnsp_trb *end_trb,
+					     dma_addr_t suspect_dma)
+{
+	struct cdnsp_segment *cur_seg;
+	union cdnsp_trb *temp_trb;
+	dma_addr_t end_seg_dma;
+	dma_addr_t end_trb_dma;
+	dma_addr_t start_dma;
+
+	start_dma = cdnsp_trb_virt_to_dma(start_seg, start_trb);
+	cur_seg = start_seg;
+
+	do {
+		if (start_dma == 0)
+			return NULL;
+
+		temp_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1];
+		/* We may get an event for a Link TRB in the middle of a TD */
+		end_seg_dma = cdnsp_trb_virt_to_dma(cur_seg, temp_trb);
+		/* If the end TRB isn't in this segment, this is set to 0 */
+		end_trb_dma = cdnsp_trb_virt_to_dma(cur_seg, end_trb);
+
+		if (end_trb_dma > 0) {
+			/*
+			 * The end TRB is in this segment, so suspect should
+			 * be here
+			 */
+			if (start_dma <= end_trb_dma) {
+				if (suspect_dma >= start_dma &&
+				    suspect_dma <= end_trb_dma) {
+					return cur_seg;
+				}
+			} else {
+				/*
+				 * Case for one segment with a
+				 * TD wrapped around to the top
+				 */
+				if ((suspect_dma >= start_dma &&
+				     suspect_dma <= end_seg_dma) ||
+				    (suspect_dma >= cur_seg->dma &&
+				     suspect_dma <= end_trb_dma)) {
+					return cur_seg;
+				}
+			}
+
+			return NULL;
+		}
+
+		/* Might still be somewhere in this segment */
+		if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma)
+			return cur_seg;
+
+		cur_seg = cur_seg->next;
+		start_dma = cdnsp_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
+	} while (cur_seg != start_seg);
+
+	return NULL;
+}
+
+static void cdnsp_unmap_td_bounce_buffer(struct cdnsp_device *pdev,
+					 struct cdnsp_ring *ring,
+					 struct cdnsp_td *td)
+{
+	struct cdnsp_segment *seg = td->bounce_seg;
+	struct cdnsp_request *preq;
+	size_t len;
+
+	if (!seg)
+		return;
+
+	preq = td->preq;
+
+	if (!preq->direction) {
+		dma_unmap_single(pdev->dev, seg->bounce_dma,
+				 ring->bounce_buf_len,  DMA_TO_DEVICE);
+		return;
+	}
+
+	dma_unmap_single(pdev->dev, seg->bounce_dma, ring->bounce_buf_len,
+			 DMA_FROM_DEVICE);
+
+	/* For in transfers we need to copy the data from bounce to sg */
+	len = sg_pcopy_from_buffer(preq->request.sg, preq->request.num_sgs,
+				   seg->bounce_buf, seg->bounce_len,
+				   seg->bounce_offs);
+	if (len != seg->bounce_len)
+		dev_warn(pdev->dev, "WARN Wrong bounce buffer read length: %zu != %d\n",
+			 len, seg->bounce_len);
+
+	seg->bounce_len = 0;
+	seg->bounce_offs = 0;
+}
+
+static int cdnsp_cmd_set_deq(struct cdnsp_device *pdev,
+			     struct cdnsp_ep *pep,
+			     struct cdnsp_dequeue_state *deq_state)
+{
+	struct cdnsp_ring *ep_ring;
+	int ret;
+
+	if (!deq_state->new_deq_ptr || !deq_state->new_deq_seg) {
+		cdnsp_ring_doorbell_for_active_rings(pdev, pep);
+		return 0;
+	}
+
+	cdnsp_queue_new_dequeue_state(pdev, pep, deq_state);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	/*
+	 * Update the ring's dequeue segment and dequeue pointer
+	 * to reflect the new position.
+	 */
+	ep_ring = cdnsp_get_transfer_ring(pdev, pep, deq_state->stream_id);
+
+	if (cdnsp_trb_is_link(ep_ring->dequeue)) {
+		ep_ring->deq_seg = ep_ring->deq_seg->next;
+		ep_ring->dequeue = ep_ring->deq_seg->trbs;
+	}
+
+	while (ep_ring->dequeue != deq_state->new_deq_ptr) {
+		ep_ring->num_trbs_free++;
+		ep_ring->dequeue++;
+
+		if (cdnsp_trb_is_link(ep_ring->dequeue)) {
+			if (ep_ring->dequeue == deq_state->new_deq_ptr)
+				break;
+
+			ep_ring->deq_seg = ep_ring->deq_seg->next;
+			ep_ring->dequeue = ep_ring->deq_seg->trbs;
+		}
+	}
+
+	/*
+	 * Probably there was TIMEOUT during handling Set Dequeue Pointer
+	 * command. It's critical error and controller will be stopped.
+	 */
+	if (ret)
+		return -ESHUTDOWN;
+
+	/* Restart any rings with pending requests */
+	cdnsp_ring_doorbell_for_active_rings(pdev, pep);
+
+	return 0;
+}
+
+int cdnsp_remove_request(struct cdnsp_device *pdev,
+			 struct cdnsp_request *preq,
+			 struct cdnsp_ep *pep)
+{
+	struct cdnsp_dequeue_state deq_state;
+	struct cdnsp_td *cur_td = NULL;
+	struct cdnsp_ring *ep_ring;
+	struct cdnsp_segment *seg;
+	int status = -ECONNRESET;
+	int ret = 0;
+	u64 hw_deq;
+
+	memset(&deq_state, 0, sizeof(deq_state));
+
+	cur_td = &preq->td;
+	ep_ring = cdnsp_request_to_transfer_ring(pdev, preq);
+
+	/*
+	 * If we stopped on the TD we need to cancel, then we have to
+	 * move the controller endpoint ring dequeue pointer past
+	 * this TD.
+	 */
+	hw_deq = cdnsp_get_hw_deq(pdev, pep->idx, preq->request.stream_id);
+	hw_deq &= ~0xf;
+
+	seg = cdnsp_trb_in_td(pdev, cur_td->start_seg, cur_td->first_trb,
+			      cur_td->last_trb, hw_deq);
+
+	if (seg && (pep->ep_state & EP_ENABLED))
+		cdnsp_find_new_dequeue_state(pdev, pep, preq->request.stream_id,
+					     cur_td, &deq_state);
+	else
+		cdnsp_td_to_noop(pdev, ep_ring, cur_td, false);
+
+	/*
+	 * The event handler won't see a completion for this TD anymore,
+	 * so remove it from the endpoint ring's TD list.
+	 */
+	list_del_init(&cur_td->td_list);
+	ep_ring->num_tds--;
+	pep->stream_info.td_count--;
+
+	/*
+	 * During disconnecting all endpoint will be disabled so we don't
+	 * have to worry about updating dequeue pointer.
+	 */
+	if (pdev->cdnsp_state & CDNSP_STATE_DISCONNECT_PENDING) {
+		status = -ESHUTDOWN;
+		ret = cdnsp_cmd_set_deq(pdev, pep, &deq_state);
+	}
+
+	cdnsp_unmap_td_bounce_buffer(pdev, ep_ring, cur_td);
+	cdnsp_gadget_giveback(pep, cur_td->preq, status);
+
+	return ret;
+}
+
+static int cdnsp_update_port_id(struct cdnsp_device *pdev, u32 port_id)
+{
+	struct cdnsp_port *port = pdev->active_port;
+	u8 old_port = 0;
+
+	if (port && port->port_num == port_id)
+		return 0;
+
+	if (port)
+		old_port = port->port_num;
+
+	if (port_id == pdev->usb2_port.port_num) {
+		port = &pdev->usb2_port;
+	} else if (port_id == pdev->usb3_port.port_num) {
+		port  = &pdev->usb3_port;
+	} else {
+		dev_err(pdev->dev, "Port event with invalid port ID %d\n",
+			port_id);
+		return -EINVAL;
+	}
+
+	if (port_id != old_port) {
+		cdnsp_disable_slot(pdev);
+		pdev->active_port = port;
+		cdnsp_enable_slot(pdev);
+	}
+
+	if (port_id == pdev->usb2_port.port_num)
+		cdnsp_set_usb2_hardware_lpm(pdev, NULL, 1);
+	else
+		writel(PORT_U1_TIMEOUT(1) | PORT_U2_TIMEOUT(1),
+		       &pdev->usb3_port.regs->portpmsc);
+
+	return 0;
+}
+
+static void cdnsp_handle_port_status(struct cdnsp_device *pdev,
+				     union cdnsp_trb *event)
+{
+	struct cdnsp_port_regs __iomem *port_regs;
+	u32 portsc, cmd_regs;
+	bool port2 = false;
+	u32 link_state;
+	u32 port_id;
+
+	/* Port status change events always have a successful completion code */
+	if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS)
+		dev_err(pdev->dev, "ERR: incorrect PSC event\n");
+
+	port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0]));
+
+	if (cdnsp_update_port_id(pdev, port_id))
+		goto cleanup;
+
+	port_regs = pdev->active_port->regs;
+
+	if (port_id == pdev->usb2_port.port_num)
+		port2 = true;
+
+new_event:
+	portsc = readl(&port_regs->portsc);
+	writel(cdnsp_port_state_to_neutral(portsc) |
+	       (portsc & PORT_CHANGE_BITS), &port_regs->portsc);
+
+	pdev->gadget.speed = cdnsp_port_speed(portsc);
+	link_state = portsc & PORT_PLS_MASK;
+
+	/* Port Link State change detected. */
+	if ((portsc & PORT_PLC)) {
+		if (!(pdev->cdnsp_state & CDNSP_WAKEUP_PENDING)  &&
+		    link_state == XDEV_RESUME) {
+			cmd_regs = readl(&pdev->op_regs->command);
+			if (!(cmd_regs & CMD_R_S))
+				goto cleanup;
+
+			if (DEV_SUPERSPEED_ANY(portsc)) {
+				cdnsp_set_link_state(pdev, &port_regs->portsc,
+						     XDEV_U0);
+
+				cdnsp_resume_gadget(pdev);
+			}
+		}
+
+		if ((pdev->cdnsp_state & CDNSP_WAKEUP_PENDING) &&
+		    link_state == XDEV_U0) {
+			pdev->cdnsp_state &= ~CDNSP_WAKEUP_PENDING;
+
+			cdnsp_force_header_wakeup(pdev, 1);
+			cdnsp_ring_cmd_db(pdev);
+			cdnsp_wait_for_cmd_compl(pdev);
+		}
+
+		if (link_state == XDEV_U0 && pdev->link_state == XDEV_U3 &&
+		    !DEV_SUPERSPEED_ANY(portsc))
+			cdnsp_resume_gadget(pdev);
+
+		if (link_state == XDEV_U3 &&  pdev->link_state != XDEV_U3)
+			cdnsp_suspend_gadget(pdev);
+
+		pdev->link_state = link_state;
+	}
+
+	if (portsc & PORT_CSC) {
+		/* Detach device. */
+		if (pdev->gadget.connected && !(portsc & PORT_CONNECT))
+			cdnsp_disconnect_gadget(pdev);
+
+		/* Attach device. */
+		if (portsc & PORT_CONNECT) {
+			if (!port2)
+				cdnsp_irq_reset(pdev);
+
+			usb_gadget_set_state(&pdev->gadget, USB_STATE_ATTACHED);
+		}
+	}
+
+	/* Port reset. */
+	if ((portsc & (PORT_RC | PORT_WRC)) && (portsc & PORT_CONNECT)) {
+		cdnsp_irq_reset(pdev);
+		pdev->u1_allowed = 0;
+		pdev->u2_allowed = 0;
+		pdev->may_wakeup = 0;
+	}
+
+	if (portsc & PORT_CEC)
+		dev_err(pdev->dev, "Port Over Current detected\n");
+
+	if (portsc & PORT_CEC)
+		dev_err(pdev->dev, "Port Configure Error detected\n");
+
+	if (readl(&port_regs->portsc) & PORT_CHANGE_BITS)
+		goto new_event;
+
+cleanup:
+	cdnsp_inc_deq(pdev, pdev->event_ring);
+}
+
+static void cdnsp_td_cleanup(struct cdnsp_device *pdev,
+			     struct cdnsp_td *td,
+			     struct cdnsp_ring *ep_ring,
+			     int *status)
+{
+	struct cdnsp_request *preq = td->preq;
+
+	/* if a bounce buffer was used to align this td then unmap it */
+	cdnsp_unmap_td_bounce_buffer(pdev, ep_ring, td);
+
+	/*
+	 * If the controller said we transferred more data than the buffer
+	 * length, Play it safe and say we didn't transfer anything.
+	 */
+	if (preq->request.actual > preq->request.length) {
+		preq->request.actual = 0;
+		*status = 0;
+	}
+
+	list_del_init(&td->td_list);
+	ep_ring->num_tds--;
+	preq->pep->stream_info.td_count--;
+
+	cdnsp_gadget_giveback(preq->pep, preq, *status);
+}
+
+static void cdnsp_finish_td(struct cdnsp_device *pdev,
+			    struct cdnsp_td *td,
+			    struct cdnsp_transfer_event *event,
+			    struct cdnsp_ep *ep,
+			    int *status)
+{
+	struct cdnsp_ring *ep_ring;
+	u32 trb_comp_code;
+
+	ep_ring = cdnsp_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
+	trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+
+	if (trb_comp_code == COMP_STOPPED_LENGTH_INVALID ||
+	    trb_comp_code == COMP_STOPPED ||
+	    trb_comp_code == COMP_STOPPED_SHORT_PACKET) {
+		/*
+		 * The Endpoint Stop Command completion will take care of any
+		 * stopped TDs. A stopped TD may be restarted, so don't update
+		 * the ring dequeue pointer or take this TD off any lists yet.
+		 */
+		return;
+	}
+
+	/* Update ring dequeue pointer */
+	while (ep_ring->dequeue != td->last_trb)
+		cdnsp_inc_deq(pdev, ep_ring);
+
+	cdnsp_inc_deq(pdev, ep_ring);
+
+	cdnsp_td_cleanup(pdev, td, ep_ring, status);
+}
+
+/* sum trb lengths from ring dequeue up to stop_trb, _excluding_ stop_trb */
+static int cdnsp_sum_trb_lengths(struct cdnsp_device *pdev,
+				 struct cdnsp_ring *ring,
+				 union cdnsp_trb *stop_trb)
+{
+	struct cdnsp_segment *seg = ring->deq_seg;
+	union cdnsp_trb *trb = ring->dequeue;
+	u32 sum;
+
+	for (sum = 0; trb != stop_trb; cdnsp_next_trb(pdev, ring, &seg, &trb)) {
+		if (!cdnsp_trb_is_noop(trb) && !cdnsp_trb_is_link(trb))
+			sum += TRB_LEN(le32_to_cpu(trb->generic.field[2]));
+	}
+	return sum;
+}
+
+static int cdnsp_giveback_first_trb(struct cdnsp_device *pdev,
+				    struct cdnsp_ep *pep,
+				    unsigned int stream_id,
+				    int start_cycle,
+				    struct cdnsp_generic_trb *start_trb)
+{
+	/*
+	 * Pass all the TRBs to the hardware at once and make sure this write
+	 * isn't reordered.
+	 */
+	wmb();
+
+	if (start_cycle)
+		start_trb->field[3] |= cpu_to_le32(start_cycle);
+	else
+		start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE);
+
+	if ((pep->ep_state & EP_HAS_STREAMS) &&
+	    !pep->stream_info.first_prime_det)
+		return 0;
+
+	return cdnsp_ring_ep_doorbell(pdev, pep, stream_id);
+}
+
+/*
+ * Process control tds, update USB request status and actual_length.
+ */
+static void cdnsp_process_ctrl_td(struct cdnsp_device *pdev,
+				  struct cdnsp_td *td,
+				  union cdnsp_trb *event_trb,
+				  struct cdnsp_transfer_event *event,
+				  struct cdnsp_ep *pep,
+				  int *status)
+{
+	struct cdnsp_ring *ep_ring;
+	u32 remaining;
+	u32 trb_type;
+
+	trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event_trb->generic.field[3]));
+	ep_ring = cdnsp_dma_to_transfer_ring(pep, le64_to_cpu(event->buffer));
+	remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+
+	/*
+	 * if on data stage then update the actual_length of the USB
+	 * request and flag it as set, so it won't be overwritten in the event
+	 * for the last TRB.
+	 */
+	if (trb_type == TRB_DATA) {
+		td->request_length_set = true;
+		td->preq->request.actual = td->preq->request.length - remaining;
+	}
+
+	/* at status stage */
+	if (!td->request_length_set)
+		td->preq->request.actual = td->preq->request.length;
+
+	if (pdev->ep0_stage == CDNSP_DATA_STAGE && pep->number == 0 &&
+	    pdev->three_stage_setup) {
+		td = list_entry(ep_ring->td_list.next, struct cdnsp_td,
+				td_list);
+		pdev->ep0_stage = CDNSP_STATUS_STAGE;
+
+		cdnsp_giveback_first_trb(pdev, pep, 0, ep_ring->cycle_state,
+					 &td->last_trb->generic);
+		return;
+	}
+
+	cdnsp_finish_td(pdev, td, event, pep, status);
+}
+
+/*
+ * Process isochronous tds, update usb request status and actual_length.
+ */
+static void cdnsp_process_isoc_td(struct cdnsp_device *pdev,
+				  struct cdnsp_td *td,
+				  union cdnsp_trb *ep_trb,
+				  struct cdnsp_transfer_event *event,
+				  struct cdnsp_ep *pep,
+				  int status)
+{
+	struct cdnsp_request *preq = td->preq;
+	u32 remaining, requested, ep_trb_len;
+	bool sum_trbs_for_length = false;
+	struct cdnsp_ring *ep_ring;
+	u32 trb_comp_code;
+	u32 td_length;
+
+	ep_ring = cdnsp_dma_to_transfer_ring(pep, le64_to_cpu(event->buffer));
+	trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+	remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+	ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2]));
+
+	requested = preq->request.length;
+
+	/* handle completion code */
+	switch (trb_comp_code) {
+	case COMP_SUCCESS:
+		preq->request.status = 0;
+		break;
+	case COMP_SHORT_PACKET:
+		preq->request.status = 0;
+		sum_trbs_for_length = true;
+		break;
+	case COMP_ISOCH_BUFFER_OVERRUN:
+	case COMP_BABBLE_DETECTED_ERROR:
+		preq->request.status = -EOVERFLOW;
+		break;
+	case COMP_STOPPED:
+		sum_trbs_for_length = true;
+		break;
+	case COMP_STOPPED_SHORT_PACKET:
+		/* field normally containing residue now contains transferred */
+		preq->request.status  = 0;
+		requested = remaining;
+		break;
+	case COMP_STOPPED_LENGTH_INVALID:
+		requested = 0;
+		remaining = 0;
+		break;
+	default:
+		sum_trbs_for_length = true;
+		preq->request.status = -1;
+		break;
+	}
+
+	if (sum_trbs_for_length) {
+		td_length = cdnsp_sum_trb_lengths(pdev, ep_ring, ep_trb);
+		td_length += ep_trb_len - remaining;
+	} else {
+		td_length = requested;
+	}
+
+	td->preq->request.actual += td_length;
+
+	cdnsp_finish_td(pdev, td, event, pep, &status);
+}
+
+static void cdnsp_skip_isoc_td(struct cdnsp_device *pdev,
+			       struct cdnsp_td *td,
+			       struct cdnsp_transfer_event *event,
+			       struct cdnsp_ep *pep,
+			       int status)
+{
+	struct cdnsp_ring *ep_ring;
+
+	ep_ring = cdnsp_dma_to_transfer_ring(pep, le64_to_cpu(event->buffer));
+	td->preq->request.status = -EXDEV;
+	td->preq->request.actual = 0;
+
+	/* Update ring dequeue pointer */
+	while (ep_ring->dequeue != td->last_trb)
+		cdnsp_inc_deq(pdev, ep_ring);
+
+	cdnsp_inc_deq(pdev, ep_ring);
+
+	cdnsp_td_cleanup(pdev, td, ep_ring, &status);
+}
+
+/*
+ * Process bulk and interrupt tds, update usb request status and actual_length.
+ */
+static void cdnsp_process_bulk_intr_td(struct cdnsp_device *pdev,
+				       struct cdnsp_td *td,
+				       union cdnsp_trb *ep_trb,
+				       struct cdnsp_transfer_event *event,
+				       struct cdnsp_ep *ep,
+				       int *status)
+{
+	u32 remaining, requested, ep_trb_len;
+	struct cdnsp_ring *ep_ring;
+	u32 trb_comp_code;
+
+	ep_ring = cdnsp_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
+	trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+	remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+	ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2]));
+	requested = td->preq->request.length;
+
+	switch (trb_comp_code) {
+	case COMP_SUCCESS:
+	case COMP_SHORT_PACKET:
+		*status = 0;
+		break;
+	case COMP_STOPPED_SHORT_PACKET:
+		td->preq->request.actual = remaining;
+		goto finish_td;
+	case COMP_STOPPED_LENGTH_INVALID:
+		/* Stopped on ep trb with invalid length, exclude it. */
+		ep_trb_len = 0;
+		remaining = 0;
+		break;
+	}
+
+	if (ep_trb == td->last_trb)
+		ep_trb_len = requested - remaining;
+	else
+		ep_trb_len = cdnsp_sum_trb_lengths(pdev, ep_ring, ep_trb) +
+						   ep_trb_len - remaining;
+	td->preq->request.actual = ep_trb_len;
+
+finish_td:
+	ep->stream_info.drbls_count--;
+
+	cdnsp_finish_td(pdev, td, event, ep, status);
+}
+
+static void cdnsp_handle_tx_nrdy(struct cdnsp_device *pdev,
+				 struct cdnsp_transfer_event *event)
+{
+	struct cdnsp_generic_trb *generic;
+	struct cdnsp_ring *ep_ring;
+	struct cdnsp_ep *pep;
+	int cur_stream;
+	int ep_index;
+	int host_sid;
+	int dev_sid;
+
+	generic = (struct cdnsp_generic_trb *)event;
+	ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
+	dev_sid = TRB_TO_DEV_STREAM(le32_to_cpu(generic->field[0]));
+	host_sid = TRB_TO_HOST_STREAM(le32_to_cpu(generic->field[2]));
+
+	pep = &pdev->eps[ep_index];
+
+	if (!(pep->ep_state & EP_HAS_STREAMS))
+		return;
+
+	if (host_sid == STREAM_PRIME_ACK) {
+		pep->stream_info.first_prime_det = 1;
+		for (cur_stream = 1; cur_stream < pep->stream_info.num_streams;
+		    cur_stream++) {
+			ep_ring = pep->stream_info.stream_rings[cur_stream];
+			ep_ring->stream_active = 1;
+			ep_ring->stream_rejected = 0;
+		}
+	}
+
+	if (host_sid == STREAM_REJECTED) {
+		struct cdnsp_td *td, *td_temp;
+
+		pep->stream_info.drbls_count--;
+		ep_ring = pep->stream_info.stream_rings[dev_sid];
+		ep_ring->stream_active = 0;
+		ep_ring->stream_rejected = 1;
+
+		list_for_each_entry_safe(td, td_temp, &ep_ring->td_list,
+					 td_list) {
+			td->drbl = 0;
+		}
+	}
+
+	cdnsp_ring_doorbell_for_active_rings(pdev, pep);
+}
+
+/*
+ * If this function returns an error condition, it means it got a Transfer
+ * event with a corrupted TRB DMA address or endpoint is disabled.
+ */
+static int cdnsp_handle_tx_event(struct cdnsp_device *pdev,
+				 struct cdnsp_transfer_event *event)
+{
+	const struct usb_endpoint_descriptor *desc;
+	bool handling_skipped_tds = false;
+	struct cdnsp_segment *ep_seg;
+	struct cdnsp_ring *ep_ring;
+	int status = -EINPROGRESS;
+	union cdnsp_trb *ep_trb;
+	dma_addr_t ep_trb_dma;
+	struct cdnsp_ep *pep;
+	struct cdnsp_td *td;
+	u32 trb_comp_code;
+	int invalidate;
+	int ep_index;
+
+	invalidate = le32_to_cpu(event->flags) & TRB_EVENT_INVALIDATE;
+	ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
+	trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+	ep_trb_dma = le64_to_cpu(event->buffer);
+
+	pep = &pdev->eps[ep_index];
+	ep_ring = cdnsp_dma_to_transfer_ring(pep, le64_to_cpu(event->buffer));
+
+	/*
+	 * If device is disconnect then all requests will be dequeued
+	 * by upper layers as part of disconnect sequence.
+	 * We don't want handle such event to avoid racing.
+	 */
+	if (invalidate || !pdev->gadget.connected)
+		goto cleanup;
+
+	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_DISABLED)
+		goto err_out;
+
+	/* Some transfer events don't always point to a trb*/
+	if (!ep_ring) {
+		switch (trb_comp_code) {
+		case COMP_INVALID_STREAM_TYPE_ERROR:
+		case COMP_INVALID_STREAM_ID_ERROR:
+		case COMP_RING_UNDERRUN:
+		case COMP_RING_OVERRUN:
+			goto cleanup;
+		default:
+			dev_err(pdev->dev, "ERROR: %s event for unknown ring\n",
+				pep->name);
+			goto err_out;
+		}
+	}
+
+	/* Look for some error cases that need special treatment. */
+	switch (trb_comp_code) {
+	case COMP_BABBLE_DETECTED_ERROR:
+		status = -EOVERFLOW;
+		break;
+	case COMP_RING_UNDERRUN:
+	case COMP_RING_OVERRUN:
+		/*
+		 * When the Isoch ring is empty, the controller will generate
+		 * a Ring Overrun Event for IN Isoch endpoint or Ring
+		 * Underrun Event for OUT Isoch endpoint.
+		 */
+		goto cleanup;
+	case COMP_MISSED_SERVICE_ERROR:
+		/*
+		 * When encounter missed service error, one or more isoc tds
+		 * may be missed by controller.
+		 * Set skip flag of the ep_ring; Complete the missed tds as
+		 * short transfer when process the ep_ring next time.
+		 */
+		pep->skip = true;
+		break;
+	}
+
+	do {
+		/*
+		 * This TRB should be in the TD at the head of this ring's TD
+		 * list.
+		 */
+		if (list_empty(&ep_ring->td_list)) {
+			if (pep->skip)
+				pep->skip = false;
+
+			goto cleanup;
+		}
+
+		td = list_entry(ep_ring->td_list.next, struct cdnsp_td,
+				td_list);
+
+		/* Is this a TRB in the currently executing TD? */
+		ep_seg = cdnsp_trb_in_td(pdev, ep_ring->deq_seg,
+					 ep_ring->dequeue, td->last_trb,
+					 ep_trb_dma);
+
+		/*
+		 * Skip the Force Stopped Event. The event_trb(ep_trb_dma)
+		 * of FSE is not in the current TD pointed by ep_ring->dequeue
+		 * because that the hardware dequeue pointer still at the
+		 * previous TRB of the current TD. The previous TRB maybe a
+		 * Link TD or the last TRB of the previous TD. The command
+		 * completion handle will take care the rest.
+		 */
+		if (!ep_seg && (trb_comp_code == COMP_STOPPED ||
+				trb_comp_code == COMP_STOPPED_LENGTH_INVALID)) {
+			pep->skip = false;
+			goto cleanup;
+		}
+
+		desc = td->preq->pep->endpoint.desc;
+		if (!ep_seg) {
+			if (!pep->skip || !usb_endpoint_xfer_isoc(desc)) {
+				/* Something is busted, give up! */
+				dev_err(pdev->dev,
+					"ERROR Transfer event TRB DMA ptr not "
+					"part of current TD ep_index %d "
+					"comp_code %u\n", ep_index,
+					trb_comp_code);
+				return -EINVAL;
+			}
+
+			cdnsp_skip_isoc_td(pdev, td, event, pep, status);
+			goto cleanup;
+		}
+
+		if (trb_comp_code == COMP_SHORT_PACKET)
+			ep_ring->last_td_was_short = true;
+		else
+			ep_ring->last_td_was_short = false;
+
+		if (pep->skip) {
+			pep->skip = false;
+			cdnsp_skip_isoc_td(pdev, td, event, pep, status);
+			goto cleanup;
+		}
+
+		ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma)
+				       / sizeof(*ep_trb)];
+
+		if (cdnsp_trb_is_noop(ep_trb))
+			goto cleanup;
+
+		if (usb_endpoint_xfer_control(desc))
+			cdnsp_process_ctrl_td(pdev, td, ep_trb, event, pep,
+					      &status);
+		else if (usb_endpoint_xfer_isoc(desc))
+			cdnsp_process_isoc_td(pdev, td, ep_trb, event, pep,
+					      status);
+		else
+			cdnsp_process_bulk_intr_td(pdev, td, ep_trb, event, pep,
+						   &status);
+cleanup:
+		handling_skipped_tds = pep->skip;
+
+		/*
+		 * Do not update event ring dequeue pointer if we're in a loop
+		 * processing missed tds.
+		 */
+		if (!handling_skipped_tds)
+			cdnsp_inc_deq(pdev, pdev->event_ring);
+
+	/*
+	 * If ep->skip is set, it means there are missed tds on the
+	 * endpoint ring need to take care of.
+	 * Process them as short transfer until reach the td pointed by
+	 * the event.
+	 */
+	} while (handling_skipped_tds);
+	return 0;
+
+err_out:
+	dev_err(pdev->dev, "@%016llx %08x %08x %08x %08x\n",
+		(unsigned long long)
+		cdnsp_trb_virt_to_dma(pdev->event_ring->deq_seg,
+				      pdev->event_ring->dequeue),
+		 lower_32_bits(le64_to_cpu(event->buffer)),
+		 upper_32_bits(le64_to_cpu(event->buffer)),
+		 le32_to_cpu(event->transfer_len),
+		 le32_to_cpu(event->flags));
+	return -EINVAL;
+}
+
+/*
+ * This function handles all events on the event ring.
+ * Returns true for "possibly more events to process" (caller should call
+ * again), otherwise false if done.
+ */
+static bool cdnsp_handle_event(struct cdnsp_device *pdev)
+{
+	unsigned int comp_code;
+	union cdnsp_trb *event;
+	bool update_ptrs = true;
+	__le32 cycle_bit;
+	int ret = 0;
+	u32 flags;
+
+	event = pdev->event_ring->dequeue;
+	flags = le32_to_cpu(event->event_cmd.flags);
+	cycle_bit = (flags & TRB_CYCLE);
+
+	/* Does the controller or driver own the TRB? */
+	if (cycle_bit != pdev->event_ring->cycle_state)
+		return false;
+
+	/*
+	 * Barrier between reading the TRB_CYCLE (valid) flag above and any
+	 * reads of the event's flags/data below.
+	 */
+	rmb();
+
+	switch (flags & TRB_TYPE_BITMASK) {
+	case TRB_TYPE(TRB_COMPLETION):
+		/*
+		 * Command can't be handled in interrupt context so just
+		 * increment command ring dequeue pointer.
+		 */
+		cdnsp_inc_deq(pdev, pdev->cmd_ring);
+		break;
+	case TRB_TYPE(TRB_PORT_STATUS):
+		cdnsp_handle_port_status(pdev, event);
+		update_ptrs = false;
+		break;
+	case TRB_TYPE(TRB_TRANSFER):
+		ret = cdnsp_handle_tx_event(pdev, &event->trans_event);
+		if (ret >= 0)
+			update_ptrs = false;
+		break;
+	case TRB_TYPE(TRB_SETUP):
+		pdev->ep0_stage = CDNSP_SETUP_STAGE;
+		pdev->setup_id = TRB_SETUPID_TO_TYPE(flags);
+		pdev->setup_speed = TRB_SETUP_SPEEDID(flags);
+		pdev->setup = *((struct usb_ctrlrequest *)
+				&event->trans_event.buffer);
+
+		cdnsp_setup_analyze(pdev);
+		break;
+	case TRB_TYPE(TRB_ENDPOINT_NRDY):
+		cdnsp_handle_tx_nrdy(pdev, &event->trans_event);
+		break;
+	case TRB_TYPE(TRB_HC_EVENT): {
+		comp_code = GET_COMP_CODE(le32_to_cpu(event->generic.field[2]));
+
+		switch (comp_code) {
+		case COMP_EVENT_RING_FULL_ERROR:
+			dev_err(pdev->dev, "Event Ring Full\n");
+			break;
+		default:
+			dev_err(pdev->dev, "Controller error code 0x%02x\n",
+				comp_code);
+		}
+
+		break;
+	}
+	case TRB_TYPE(TRB_MFINDEX_WRAP):
+	case TRB_TYPE(TRB_DRB_OVERFLOW):
+		break;
+	default:
+		dev_warn(pdev->dev, "ERROR unknown event type %ld\n",
+			 TRB_FIELD_TO_TYPE(flags));
+	}
+
+	if (update_ptrs)
+		/* Update SW event ring dequeue pointer. */
+		cdnsp_inc_deq(pdev, pdev->event_ring);
+
+	/*
+	 * Caller will call us again to check if there are more items
+	 * on the event ring.
+	 */
+	return true;
+}
+
+irqreturn_t cdnsp_thread_irq_handler(int irq, void *data)
+{
+	struct cdnsp_device *pdev = (struct cdnsp_device *)data;
+	union cdnsp_trb *event_ring_deq;
+	int counter = 0;
+
+	spin_lock(&pdev->lock);
+
+	if (pdev->cdnsp_state & (CDNSP_STATE_HALTED | CDNSP_STATE_DYING)) {
+		cdnsp_died(pdev);
+		spin_unlock(&pdev->lock);
+		return IRQ_HANDLED;
+	}
+
+	event_ring_deq = pdev->event_ring->dequeue;
+
+	while (cdnsp_handle_event(pdev)) {
+		if (++counter >= TRBS_PER_EV_DEQ_UPDATE) {
+			cdnsp_update_erst_dequeue(pdev, event_ring_deq, 0);
+			event_ring_deq = pdev->event_ring->dequeue;
+			counter = 0;
+		}
+	}
+
+	cdnsp_update_erst_dequeue(pdev, event_ring_deq, 1);
+
+	spin_unlock(&pdev->lock);
+
+	return IRQ_HANDLED;
+}
+
+irqreturn_t cdnsp_irq_handler(int irq, void *priv)
+{
+	struct cdnsp_device *pdev = (struct cdnsp_device *)priv;
+	u32 irq_pending;
+	u32 status;
+
+	status = readl(&pdev->op_regs->status);
+
+	if (status == ~(u32)0) {
+		cdnsp_died(pdev);
+		return IRQ_HANDLED;
+	}
+
+	if (!(status & STS_EINT))
+		return IRQ_NONE;
+
+	writel(status | STS_EINT, &pdev->op_regs->status);
+	irq_pending = readl(&pdev->ir_set->irq_pending);
+	irq_pending |= IMAN_IP;
+	writel(irq_pending, &pdev->ir_set->irq_pending);
+
+	if (status & STS_FATAL) {
+		cdnsp_died(pdev);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_WAKE_THREAD;
+}
+
+/*
+ * Generic function for queuing a TRB on a ring.
+ * The caller must have checked to make sure there's room on the ring.
+ *
+ * @more_trbs_coming:	Will you enqueue more TRBs before setting doorbell?
+ */
+static void cdnsp_queue_trb(struct cdnsp_device *pdev, struct cdnsp_ring *ring,
+			    bool more_trbs_coming, u32 field1, u32 field2,
+			    u32 field3, u32 field4)
+{
+	struct cdnsp_generic_trb *trb;
+
+	trb = &ring->enqueue->generic;
+
+	trb->field[0] = cpu_to_le32(field1);
+	trb->field[1] = cpu_to_le32(field2);
+	trb->field[2] = cpu_to_le32(field3);
+	trb->field[3] = cpu_to_le32(field4);
+
+	cdnsp_inc_enq(pdev, ring, more_trbs_coming);
+}
+
+/*
+ * Does various checks on the endpoint ring, and makes it ready to
+ * queue num_trbs.
+ */
+static int cdnsp_prepare_ring(struct cdnsp_device *pdev,
+			      struct cdnsp_ring *ep_ring,
+			      u32 ep_state, unsigned
+			      int num_trbs,
+			      gfp_t mem_flags)
+{
+	unsigned int num_trbs_needed;
+
+	/* Make sure the endpoint has been added to controller schedule. */
+	switch (ep_state) {
+	case EP_STATE_STOPPED:
+	case EP_STATE_RUNNING:
+	case EP_STATE_HALTED:
+		break;
+	default:
+		dev_err(pdev->dev, "ERROR: incorrect endpoint state\n");
+		return -EINVAL;
+	}
+
+	while (1) {
+		if (cdnsp_room_on_ring(pdev, ep_ring, num_trbs))
+			break;
+
+		num_trbs_needed = num_trbs - ep_ring->num_trbs_free;
+		if (cdnsp_ring_expansion(pdev, ep_ring, num_trbs_needed,
+					 mem_flags)) {
+			dev_err(pdev->dev, "Ring expansion failed\n");
+			return -ENOMEM;
+		}
+	}
+
+	while (cdnsp_trb_is_link(ep_ring->enqueue)) {
+		ep_ring->enqueue->link.control |= cpu_to_le32(TRB_CHAIN);
+		/* The cycle bit must be set as the last operation. */
+		wmb();
+		ep_ring->enqueue->link.control ^= cpu_to_le32(TRB_CYCLE);
+
+		/* Toggle the cycle bit after the last ring segment. */
+		if (cdnsp_link_trb_toggles_cycle(ep_ring->enqueue))
+			ep_ring->cycle_state ^= 1;
+		ep_ring->enq_seg = ep_ring->enq_seg->next;
+		ep_ring->enqueue = ep_ring->enq_seg->trbs;
+	}
+	return 0;
+}
+
+static int cdnsp_prepare_transfer(struct cdnsp_device *pdev,
+				  struct cdnsp_request *preq,
+				  unsigned int num_trbs)
+{
+	struct cdnsp_ring *ep_ring;
+	int ret;
+
+	ep_ring = cdnsp_get_transfer_ring(pdev, preq->pep,
+					  preq->request.stream_id);
+	if (!ep_ring)
+		return -EINVAL;
+
+	ret = cdnsp_prepare_ring(pdev, ep_ring,
+				 GET_EP_CTX_STATE(preq->pep->out_ctx),
+				 num_trbs, GFP_ATOMIC);
+	if (ret)
+		return ret;
+
+	INIT_LIST_HEAD(&preq->td.td_list);
+	preq->td.preq = preq;
+
+	/* Add this TD to the tail of the endpoint ring's TD list. */
+	list_add_tail(&preq->td.td_list, &ep_ring->td_list);
+	ep_ring->num_tds++;
+	preq->pep->stream_info.td_count++;
+
+	preq->td.start_seg = ep_ring->enq_seg;
+	preq->td.first_trb = ep_ring->enqueue;
+
+	return 0;
+}
+
+static unsigned int cdnsp_count_trbs(u64 addr, u64 len)
+{
+	unsigned int num_trbs;
+
+	num_trbs = DIV_ROUND_UP(len + (addr & (TRB_MAX_BUFF_SIZE - 1)),
+				TRB_MAX_BUFF_SIZE);
+	if (num_trbs == 0)
+		num_trbs++;
+
+	return num_trbs;
+}
+
+static unsigned int count_trbs_needed(struct cdnsp_request *preq)
+{
+	return cdnsp_count_trbs(preq->request.dma, preq->request.length);
+}
+
+static unsigned int count_sg_trbs_needed(struct cdnsp_request *preq)
+{
+	unsigned int i, len, full_len, num_trbs = 0;
+	struct scatterlist *sg;
+
+	full_len = preq->request.length;
+
+	for_each_sg(preq->request.sg, sg, preq->request.num_sgs, i) {
+		len = sg_dma_len(sg);
+		num_trbs += cdnsp_count_trbs(sg_dma_address(sg), len);
+		len = min(len, full_len);
+		full_len -= len;
+		if (full_len == 0)
+			break;
+	}
+
+	return num_trbs;
+}
+
+static unsigned int count_isoc_trbs_needed(struct cdnsp_request *preq)
+{
+	return cdnsp_count_trbs(preq->request.dma, preq->request.length);
+}
+
+static void cdnsp_check_trb_math(struct cdnsp_request *preq, int running_total)
+{
+	if (running_total != preq->request.length)
+		dev_err(preq->pep->pdev->dev,
+			"%s - Miscalculated tx length, "
+			"queued %#x, asked for %#x (%d)\n",
+			preq->pep->name, running_total,
+			preq->request.length, preq->request.actual);
+}
+
+/*
+ * TD size is the number of max packet sized packets remaining in the TD
+ * (*not* including this TRB).
+ *
+ * Total TD packet count = total_packet_count =
+ *     DIV_ROUND_UP(TD size in bytes / wMaxPacketSize)
+ *
+ * Packets transferred up to and including this TRB = packets_transferred =
+ *     rounddown(total bytes transferred including this TRB / wMaxPacketSize)
+ *
+ * TD size = total_packet_count - packets_transferred
+ *
+ * It must fit in bits 21:17, so it can't be bigger than 31.
+ * This is taken care of in the TRB_TD_SIZE() macro
+ *
+ * The last TRB in a TD must have the TD size set to zero.
+ */
+static u32 cdnsp_td_remainder(struct cdnsp_device *pdev,
+			      int transferred,
+			      int trb_buff_len,
+			      unsigned int td_total_len,
+			      struct cdnsp_request *preq,
+			      bool more_trbs_coming)
+{
+	u32 maxp, total_packet_count;
+
+	/* One TRB with a zero-length data packet. */
+	if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) ||
+	    trb_buff_len == td_total_len)
+		return 0;
+
+	maxp = usb_endpoint_maxp(preq->pep->endpoint.desc);
+	total_packet_count = DIV_ROUND_UP(td_total_len, maxp);
+
+	/* Queuing functions don't count the current TRB into transferred. */
+	return (total_packet_count - ((transferred + trb_buff_len) / maxp));
+}
+
+static int cdnsp_align_td(struct cdnsp_device *pdev,
+			  struct cdnsp_request *preq, u32 enqd_len,
+			  u32 *trb_buff_len, struct cdnsp_segment *seg)
+{
+	struct device *dev = pdev->dev;
+	unsigned int unalign;
+	unsigned int max_pkt;
+	u32 new_buff_len;
+
+	max_pkt = usb_endpoint_maxp(preq->pep->endpoint.desc);
+	unalign = (enqd_len + *trb_buff_len) % max_pkt;
+
+	/* We got lucky, last normal TRB data on segment is packet aligned. */
+	if (unalign == 0)
+		return 0;
+
+	/* Is the last nornal TRB alignable by splitting it. */
+	if (*trb_buff_len > unalign) {
+		*trb_buff_len -= unalign;
+		return 0;
+	}
+
+	/*
+	 * We want enqd_len + trb_buff_len to sum up to a number aligned to
+	 * number which is divisible by the endpoint's wMaxPacketSize. IOW:
+	 * (size of currently enqueued TRBs + remainder) % wMaxPacketSize == 0.
+	 */
+	new_buff_len = max_pkt - (enqd_len % max_pkt);
+
+	if (new_buff_len > (preq->request.length - enqd_len))
+		new_buff_len = (preq->request.length - enqd_len);
+
+	/* Create a max max_pkt sized bounce buffer pointed to by last trb. */
+	if (preq->direction) {
+		sg_pcopy_to_buffer(preq->request.sg,
+				   preq->request.num_mapped_sgs,
+				   seg->bounce_buf, new_buff_len, enqd_len);
+		seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
+						 max_pkt, DMA_TO_DEVICE);
+	} else {
+		seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
+						 max_pkt, DMA_FROM_DEVICE);
+	}
+
+	if (dma_mapping_error(dev, seg->bounce_dma)) {
+		/* Try without aligning.*/
+		dev_warn(pdev->dev,
+			 "Failed mapping bounce buffer, not aligning\n");
+		return 0;
+	}
+
+	*trb_buff_len = new_buff_len;
+	seg->bounce_len = new_buff_len;
+	seg->bounce_offs = enqd_len;
+
+	/*
+	 * Bounce buffer successful aligned and seg->bounce_dma will be used
+	 * in transfer TRB as new transfer buffer address.
+	 */
+	return 1;
+}
+
+int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
+{
+	unsigned int enqd_len, block_len, trb_buff_len, full_len;
+	unsigned int start_cycle, num_sgs = 0;
+	struct cdnsp_generic_trb *start_trb;
+	u32 field, length_field, remainder;
+	struct scatterlist *sg = NULL;
+	bool more_trbs_coming = true;
+	bool need_zero_pkt = false;
+	bool zero_len_trb = false;
+	struct cdnsp_ring *ring;
+	bool first_trb = true;
+	unsigned int num_trbs;
+	struct cdnsp_ep *pep;
+	u64 addr, send_addr;
+	int sent_len, ret;
+
+	ring = cdnsp_request_to_transfer_ring(pdev, preq);
+	if (!ring)
+		return -EINVAL;
+
+	full_len = preq->request.length;
+
+	if (preq->request.num_sgs) {
+		num_sgs = preq->request.num_sgs;
+		sg = preq->request.sg;
+		addr = (u64)sg_dma_address(sg);
+		block_len = sg_dma_len(sg);
+		num_trbs = count_sg_trbs_needed(preq);
+	} else {
+		num_trbs = count_trbs_needed(preq);
+		addr = (u64)preq->request.dma;
+		block_len = full_len;
+	}
+
+	pep = preq->pep;
+
+	/* Deal with request.zero - need one more td/trb. */
+	if (preq->request.zero && preq->request.length &&
+	    IS_ALIGNED(full_len, usb_endpoint_maxp(pep->endpoint.desc))) {
+		need_zero_pkt = true;
+		num_trbs++;
+	}
+
+	ret = cdnsp_prepare_transfer(pdev, preq, num_trbs);
+	if (ret)
+		return ret;
+
+	/*
+	 * Don't give the first TRB to the hardware (by toggling the cycle bit)
+	 * until we've finished creating all the other TRBs. The ring's cycle
+	 * state may change as we enqueue the other TRBs, so save it too.
+	 */
+	start_trb = &ring->enqueue->generic;
+	start_cycle = ring->cycle_state;
+	send_addr = addr;
+
+	/* Queue the TRBs, even if they are zero-length */
+	for (enqd_len = 0; zero_len_trb || first_trb || enqd_len < full_len;
+	     enqd_len += trb_buff_len) {
+		field = TRB_TYPE(TRB_NORMAL);
+
+		/* TRB buffer should not cross 64KB boundaries */
+		trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
+		trb_buff_len = min(trb_buff_len, block_len);
+		if (enqd_len + trb_buff_len > full_len)
+			trb_buff_len = full_len - enqd_len;
+
+		/* Don't change the cycle bit of the first TRB until later */
+		if (first_trb) {
+			first_trb = false;
+			if (start_cycle == 0)
+				field |= TRB_CYCLE;
+		} else {
+			field |= ring->cycle_state;
+		}
+
+		/*
+		 * Chain all the TRBs together; clear the chain bit in the last
+		 * TRB to indicate it's the last TRB in the chain.
+		 */
+		if (enqd_len + trb_buff_len < full_len || need_zero_pkt) {
+			field |= TRB_CHAIN;
+			if (cdnsp_trb_is_link(ring->enqueue + 1)) {
+				if (cdnsp_align_td(pdev, preq, enqd_len,
+						   &trb_buff_len,
+						   ring->enq_seg)) {
+					send_addr = ring->enq_seg->bounce_dma;
+					/* Assuming TD won't span 2 segs */
+					preq->td.bounce_seg = ring->enq_seg;
+				}
+			}
+		}
+
+		if (enqd_len + trb_buff_len >= full_len) {
+			if (need_zero_pkt && zero_len_trb) {
+				zero_len_trb = true;
+			} else {
+				field &= ~TRB_CHAIN;
+				field |= TRB_IOC;
+				more_trbs_coming = false;
+				need_zero_pkt = false;
+				preq->td.last_trb = ring->enqueue;
+			}
+		}
+
+		/* Only set interrupt on short packet for OUT endpoints. */
+		if (!preq->direction)
+			field |= TRB_ISP;
+
+		/* Set the TRB length, TD size, and interrupter fields. */
+		remainder = cdnsp_td_remainder(pdev, enqd_len, trb_buff_len,
+					       full_len, preq,
+					       more_trbs_coming);
+
+		length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) |
+			TRB_INTR_TARGET(0);
+
+		cdnsp_queue_trb(pdev, ring, more_trbs_coming | need_zero_pkt,
+				lower_32_bits(send_addr),
+				upper_32_bits(send_addr),
+				length_field,
+				field);
+
+		addr += trb_buff_len;
+		sent_len = trb_buff_len;
+		while (sg && sent_len >= block_len) {
+			/* New sg entry */
+			--num_sgs;
+			sent_len -= block_len;
+			if (num_sgs != 0) {
+				sg = sg_next(sg);
+				block_len = sg_dma_len(sg);
+				addr = (u64)sg_dma_address(sg);
+				addr += sent_len;
+			}
+		}
+		block_len -= sent_len;
+		send_addr = addr;
+	}
+
+	cdnsp_check_trb_math(preq, enqd_len);
+	ret = cdnsp_giveback_first_trb(pdev, pep, preq->request.stream_id,
+				       start_cycle, start_trb);
+
+	if (ret)
+		preq->td.drbl = 1;
+
+	return 0;
+}
+
+int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
+{
+	u32 field, length_field, remainder;
+	struct cdnsp_ep *pep = preq->pep;
+	struct cdnsp_ring *ep_ring;
+	int num_trbs;
+	int ret;
+
+	ep_ring = cdnsp_request_to_transfer_ring(pdev, preq);
+	if (!ep_ring)
+		return -EINVAL;
+
+	/* 1 TRB for data, 1 for status */
+	num_trbs = (pdev->three_stage_setup) ? 2 : 1;
+
+	ret = cdnsp_prepare_transfer(pdev, preq, num_trbs);
+	if (ret)
+		return ret;
+
+	/* If there's data, queue data TRBs */
+	if (pdev->ep0_expect_in)
+		field = TRB_TYPE(TRB_DATA) | TRB_IOC;
+	else
+		field = TRB_ISP | TRB_TYPE(TRB_DATA) | TRB_IOC;
+
+	if (preq->request.length > 0) {
+		remainder = cdnsp_td_remainder(pdev, 0, preq->request.length,
+					       preq->request.length, preq, 1);
+
+		length_field = TRB_LEN(preq->request.length) |
+				TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0);
+
+		if (pdev->ep0_expect_in)
+			field |= TRB_DIR_IN;
+
+		cdnsp_queue_trb(pdev, ep_ring, true,
+				lower_32_bits(preq->request.dma),
+				upper_32_bits(preq->request.dma), length_field,
+				field | ep_ring->cycle_state |
+				TRB_SETUPID(pdev->setup_id) |
+				pdev->setup_speed);
+
+		pdev->ep0_stage = CDNSP_DATA_STAGE;
+	}
+
+	/* Save the DMA address of the last TRB in the TD. */
+	preq->td.last_trb = ep_ring->enqueue;
+
+	/* Queue status TRB. */
+	if (preq->request.length == 0)
+		field = ep_ring->cycle_state;
+	else
+		field = (ep_ring->cycle_state ^ 1);
+
+	if (preq->request.length > 0 && pdev->ep0_expect_in)
+		field |= TRB_DIR_IN;
+
+	if (pep->ep_state & EP0_HALTED_STATUS) {
+		pep->ep_state &= ~EP0_HALTED_STATUS;
+		field |= TRB_SETUPSTAT(TRB_SETUPSTAT_STALL);
+	} else {
+		field |= TRB_SETUPSTAT(TRB_SETUPSTAT_ACK);
+	}
+
+	cdnsp_queue_trb(pdev, ep_ring, false, 0, 0, TRB_INTR_TARGET(0),
+			field | TRB_IOC | TRB_SETUPID(pdev->setup_id) |
+			TRB_TYPE(TRB_STATUS) | pdev->setup_speed);
+
+	cdnsp_ring_ep_doorbell(pdev, pep, preq->request.stream_id);
+
+	return 0;
+}
+
+int cdnsp_cmd_stop_ep(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	u32 ep_state = GET_EP_CTX_STATE(pep->out_ctx);
+	int ret = 0;
+
+	if (ep_state == EP_STATE_STOPPED || ep_state == EP_STATE_DISABLED)
+		goto ep_stopped;
+
+	cdnsp_queue_stop_endpoint(pdev, pep->idx);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+ep_stopped:
+	pep->ep_state |= EP_STOPPED;
+	return ret;
+}
+
+int cdnsp_cmd_flush_ep(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
+{
+	int ret;
+
+	cdnsp_queue_flush_endpoint(pdev, pep->idx);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	return ret;
+}
+
+/*
+ * The transfer burst count field of the isochronous TRB defines the number of
+ * bursts that are required to move all packets in this TD. Only SuperSpeed
+ * devices can burst up to bMaxBurst number of packets per service interval.
+ * This field is zero based, meaning a value of zero in the field means one
+ * burst. Basically, for everything but SuperSpeed devices, this field will be
+ * zero.
+ */
+static unsigned int cdnsp_get_burst_count(struct cdnsp_device *pdev,
+					  struct cdnsp_request *preq,
+					  unsigned int total_packet_count)
+{
+	unsigned int max_burst;
+
+	if (pdev->gadget.speed < USB_SPEED_SUPER)
+		return 0;
+
+	max_burst = preq->pep->endpoint.comp_desc->bMaxBurst;
+	return DIV_ROUND_UP(total_packet_count, max_burst + 1) - 1;
+}
+
+/*
+ * Returns the number of packets in the last "burst" of packets. This field is
+ * valid for all speeds of devices. USB 2.0 devices can only do one "burst", so
+ * the last burst packet count is equal to the total number of packets in the
+ * TD. SuperSpeed endpoints can have up to 3 bursts. All but the last burst
+ * must contain (bMaxBurst + 1) number of packets, but the last burst can
+ * contain 1 to (bMaxBurst + 1) packets.
+ */
+static unsigned int
+	cdnsp_get_last_burst_packet_count(struct cdnsp_device *pdev,
+					  struct cdnsp_request *preq,
+					  unsigned int total_packet_count)
+{
+	unsigned int max_burst;
+	unsigned int residue;
+
+	if (pdev->gadget.speed >= USB_SPEED_SUPER) {
+		/* bMaxBurst is zero based: 0 means 1 packet per burst. */
+		max_burst = preq->pep->endpoint.comp_desc->bMaxBurst;
+		residue = total_packet_count % (max_burst + 1);
+
+		/*
+		 * If residue is zero, the last burst contains (max_burst + 1)
+		 * number of packets, but the TLBPC field is zero-based.
+		 */
+		if (residue == 0)
+			return max_burst;
+
+		return residue - 1;
+	}
+	if (total_packet_count == 0)
+		return 0;
+
+	return total_packet_count - 1;
+}
+
+/* Queue function isoc transfer */
+static int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
+			       struct cdnsp_request *preq)
+{
+	int trb_buff_len, td_len, td_remain_len, ret;
+	unsigned int burst_count, last_burst_pkt;
+	unsigned int total_pkt_count, max_pkt;
+	struct cdnsp_generic_trb *start_trb;
+	bool more_trbs_coming = true;
+	struct cdnsp_ring *ep_ring;
+	int running_total = 0;
+	u32 field, length_field;
+	int start_cycle;
+	int trbs_per_td;
+	u64 addr;
+	int i;
+
+	ep_ring = preq->pep->ring;
+	start_trb = &ep_ring->enqueue->generic;
+	start_cycle = ep_ring->cycle_state;
+	td_len = preq->request.length;
+	addr = (u64)preq->request.dma;
+	td_remain_len = td_len;
+
+	max_pkt = usb_endpoint_maxp(preq->pep->endpoint.desc);
+	total_pkt_count = DIV_ROUND_UP(td_len, max_pkt);
+
+	/* A zero-length transfer still involves at least one packet. */
+	if (total_pkt_count == 0)
+		total_pkt_count++;
+
+	burst_count = cdnsp_get_burst_count(pdev, preq, total_pkt_count);
+	last_burst_pkt = cdnsp_get_last_burst_packet_count(pdev, preq,
+							   total_pkt_count);
+	trbs_per_td = count_isoc_trbs_needed(preq);
+
+	ret = cdnsp_prepare_transfer(pdev, preq, trbs_per_td);
+	if (ret)
+		goto cleanup;
+
+	/*
+	 * Set isoc specific data for the first TRB in a TD.
+	 * Prevent HW from getting the TRBs by keeping the cycle state
+	 * inverted in the first TDs isoc TRB.
+	 */
+	field = TRB_TYPE(TRB_ISOC) | TRB_TLBPC(last_burst_pkt) |
+		!start_cycle | TRB_SIA | TRB_TBC(burst_count);
+
+	/* Fill the rest of the TRB fields, and remaining normal TRBs. */
+	for (i = 0; i < trbs_per_td; i++) {
+		u32 remainder;
+
+		/* Calculate TRB length. */
+		trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
+		if (trb_buff_len > td_remain_len)
+			trb_buff_len = td_remain_len;
+
+		/* Set the TRB length, TD size, & interrupter fields. */
+		remainder = cdnsp_td_remainder(pdev, running_total,
+					       trb_buff_len, td_len, preq,
+					       more_trbs_coming);
+
+		length_field = TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0);
+
+		/* Only first TRB is isoc, overwrite otherwise. */
+		if (i) {
+			field = TRB_TYPE(TRB_NORMAL) | ep_ring->cycle_state;
+			length_field |= TRB_TD_SIZE(remainder);
+		} else {
+			length_field |= TRB_TD_SIZE_TBC(burst_count);
+		}
+
+		/* Only set interrupt on short packet for OUT EPs. */
+		if (usb_endpoint_dir_out(preq->pep->endpoint.desc))
+			field |= TRB_ISP;
+
+		/* Set the chain bit for all except the last TRB. */
+		if (i < trbs_per_td - 1) {
+			more_trbs_coming = true;
+			field |= TRB_CHAIN;
+		} else {
+			more_trbs_coming = false;
+			preq->td.last_trb = ep_ring->enqueue;
+			field |= TRB_IOC;
+		}
+
+		cdnsp_queue_trb(pdev, ep_ring, more_trbs_coming,
+				lower_32_bits(addr), upper_32_bits(addr),
+				length_field, field);
+
+		running_total += trb_buff_len;
+		addr += trb_buff_len;
+		td_remain_len -= trb_buff_len;
+	}
+
+	/* Check TD length */
+	if (running_total != td_len) {
+		dev_err(pdev->dev, "ISOC TD length unmatch\n");
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	cdnsp_giveback_first_trb(pdev, preq->pep, preq->request.stream_id,
+				 start_cycle, start_trb);
+
+	return 0;
+
+cleanup:
+	/* Clean up a partially enqueued isoc transfer. */
+	list_del_init(&preq->td.td_list);
+	ep_ring->num_tds--;
+
+	/*
+	 * Use the first TD as a temporary variable to turn the TDs we've
+	 * queued into No-ops with a software-owned cycle bit.
+	 * That way the hardware won't accidentally start executing bogus TDs
+	 * when we partially overwrite them.
+	 * td->first_trb and td->start_seg are already set.
+	 */
+	preq->td.last_trb = ep_ring->enqueue;
+	/* Every TRB except the first & last will have its cycle bit flipped. */
+	cdnsp_td_to_noop(pdev, ep_ring, &preq->td, true);
+
+	/* Reset the ring enqueue back to the first TRB and its cycle bit. */
+	ep_ring->enqueue = preq->td.first_trb;
+	ep_ring->enq_seg = preq->td.start_seg;
+	ep_ring->cycle_state = start_cycle;
+	return ret;
+}
+
+int cdnsp_queue_isoc_tx_prepare(struct cdnsp_device *pdev,
+				struct cdnsp_request *preq)
+{
+	struct cdnsp_ring *ep_ring;
+	u32 ep_state;
+	int num_trbs;
+	int ret;
+
+	ep_ring = preq->pep->ring;
+	ep_state = GET_EP_CTX_STATE(preq->pep->out_ctx);
+	num_trbs = count_isoc_trbs_needed(preq);
+
+	/*
+	 * Check the ring to guarantee there is enough room for the whole
+	 * request. Do not insert any td of the USB Request to the ring if the
+	 * check failed.
+	 */
+	ret = cdnsp_prepare_ring(pdev, ep_ring, ep_state, num_trbs, GFP_ATOMIC);
+	if (ret)
+		return ret;
+
+	return cdnsp_queue_isoc_tx(pdev, preq);
+}
+
+/****		Command Ring Operations		****/
+/*
+ * Generic function for queuing a command TRB on the command ring.
+ * Driver queue only one command to ring in the moment.
+ */
+static void cdnsp_queue_command(struct cdnsp_device *pdev,
+				u32 field1,
+				u32 field2,
+				u32 field3,
+				u32 field4)
+{
+	cdnsp_prepare_ring(pdev, pdev->cmd_ring, EP_STATE_RUNNING, 1,
+			   GFP_ATOMIC);
+
+	pdev->cmd.command_trb = pdev->cmd_ring->enqueue;
+
+	cdnsp_queue_trb(pdev, pdev->cmd_ring, false, field1, field2,
+			field3, field4 | pdev->cmd_ring->cycle_state);
+}
+
+/* Queue a slot enable or disable request on the command ring */
+void cdnsp_queue_slot_control(struct cdnsp_device *pdev, u32 trb_type)
+{
+	cdnsp_queue_command(pdev, 0, 0, 0, TRB_TYPE(trb_type) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id));
+}
+
+/* Queue an address device command TRB */
+void cdnsp_queue_address_device(struct cdnsp_device *pdev,
+				dma_addr_t in_ctx_ptr,
+				enum cdnsp_setup_dev setup)
+{
+	cdnsp_queue_command(pdev, lower_32_bits(in_ctx_ptr),
+			    upper_32_bits(in_ctx_ptr), 0,
+			    TRB_TYPE(TRB_ADDR_DEV) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id) |
+			    (setup == SETUP_CONTEXT_ONLY ? TRB_BSR : 0));
+}
+
+/* Queue a reset device command TRB */
+void cdnsp_queue_reset_device(struct cdnsp_device *pdev)
+{
+	cdnsp_queue_command(pdev, 0, 0, 0, TRB_TYPE(TRB_RESET_DEV) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id));
+}
+
+/* Queue a configure endpoint command TRB */
+void cdnsp_queue_configure_endpoint(struct cdnsp_device *pdev,
+				    dma_addr_t in_ctx_ptr)
+{
+	cdnsp_queue_command(pdev, lower_32_bits(in_ctx_ptr),
+			    upper_32_bits(in_ctx_ptr), 0,
+			    TRB_TYPE(TRB_CONFIG_EP) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id));
+}
+
+/*
+ * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop
+ * activity on an endpoint that is about to be suspended.
+ */
+void cdnsp_queue_stop_endpoint(struct cdnsp_device *pdev, unsigned int ep_index)
+{
+	cdnsp_queue_command(pdev, 0, 0, 0, SLOT_ID_FOR_TRB(pdev->slot_id) |
+			    EP_ID_FOR_TRB(ep_index) | TRB_TYPE(TRB_STOP_RING));
+}
+
+/* Set Transfer Ring Dequeue Pointer command. */
+void cdnsp_queue_new_dequeue_state(struct cdnsp_device *pdev,
+				   struct cdnsp_ep *pep,
+				   struct cdnsp_dequeue_state *deq_state)
+{
+	u32 trb_stream_id = STREAM_ID_FOR_TRB(deq_state->stream_id);
+	u32 trb_slot_id = SLOT_ID_FOR_TRB(pdev->slot_id);
+	u32 type = TRB_TYPE(TRB_SET_DEQ);
+	u32 trb_sct = 0;
+	dma_addr_t addr;
+
+	addr = cdnsp_trb_virt_to_dma(deq_state->new_deq_seg,
+				     deq_state->new_deq_ptr);
+
+	if (deq_state->stream_id)
+		trb_sct = SCT_FOR_TRB(SCT_PRI_TR);
+
+	cdnsp_queue_command(pdev, lower_32_bits(addr) | trb_sct |
+			    deq_state->new_cycle_state, upper_32_bits(addr),
+			    trb_stream_id, trb_slot_id |
+			    EP_ID_FOR_TRB(pep->idx) | type);
+}
+
+void cdnsp_queue_reset_ep(struct cdnsp_device *pdev, unsigned int ep_index)
+{
+	return cdnsp_queue_command(pdev, 0, 0, 0,
+				   SLOT_ID_FOR_TRB(pdev->slot_id) |
+				   EP_ID_FOR_TRB(ep_index) |
+				   TRB_TYPE(TRB_RESET_EP));
+}
+
+/*
+ * Queue a halt endpoint request on the command ring.
+ */
+void cdnsp_queue_halt_endpoint(struct cdnsp_device *pdev, unsigned int ep_index)
+{
+	cdnsp_queue_command(pdev, 0, 0, 0, TRB_TYPE(TRB_HALT_ENDPOINT) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id) |
+			    EP_ID_FOR_TRB(ep_index));
+}
+
+/*
+ * Queue a flush endpoint request on the command ring.
+ */
+void  cdnsp_queue_flush_endpoint(struct cdnsp_device *pdev,
+				 unsigned int ep_index)
+{
+	cdnsp_queue_command(pdev, 0, 0, 0, TRB_TYPE(TRB_FLUSH_ENDPOINT) |
+			    SLOT_ID_FOR_TRB(pdev->slot_id) |
+			    EP_ID_FOR_TRB(ep_index));
+}
+
+void cdnsp_force_header_wakeup(struct cdnsp_device *pdev, int intf_num)
+{
+	u32 lo, mid;
+
+	lo = TRB_FH_TO_PACKET_TYPE(TRB_FH_TR_PACKET) |
+	     TRB_FH_TO_DEVICE_ADDRESS(pdev->device_address);
+	mid = TRB_FH_TR_PACKET_DEV_NOT |
+	      TRB_FH_TO_NOT_TYPE(TRB_FH_TR_PACKET_FUNCTION_WAKE) |
+	      TRB_FH_TO_INTERFACE(intf_num);
+
+	cdnsp_queue_command(pdev, lo, mid, 0,
+			    TRB_TYPE(TRB_FORCE_HEADER) | SET_PORT_ID(2));
+}
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index e282f727a241..235d39de7b4d 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Cadence USBSS DRD Driver.
+ * Cadence USBSS and USBSSP DRD Driver.
  *
  * Copyright (C) 2018-2019 Cadence.
  * Copyright (C) 2017-2018 NXP
@@ -136,7 +136,14 @@ static int cdns_core_init_role(struct cdns *cdns)
 	dr_mode = best_dr_mode;
 
 	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
-		ret = cdns_host_init(cdns);
+		if ((cdns->version == CDNSP_CONTROLLER_V2 &&
+		     IS_ENABLED(CONFIG_USB_CDNSP_HOST)) ||
+		    (cdns->version < CDNSP_CONTROLLER_V2 &&
+		     IS_ENABLED(CONFIG_USB_CDNS3_HOST)))
+			ret = cdns_host_init(cdns);
+		else
+			ret = -ENXIO;
+
 		if (ret) {
 			dev_err(dev, "Host initialization failed with %d\n",
 				ret);
diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
index cbd2e1cc8eb1..56b568678980 100644
--- a/drivers/usb/cdns3/core.h
+++ b/drivers/usb/cdns3/core.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Cadence USBSS DRD Header File.
+ * Cadence USBSS and USBSSP DRD Header File.
  *
  * Copyright (C) 2017-2018 NXP
  * Copyright (C) 2018-2019 Cadence.
diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
index 0fd465094101..605a413db727 100644
--- a/drivers/usb/cdns3/drd.c
+++ b/drivers/usb/cdns3/drd.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Cadence USBSS DRD Driver.
+ * Cadence USBSS and USBSSP DRD Driver.
  *
  * Copyright (C) 2018-2020 Cadence.
  * Copyright (C) 2019 Texas Instruments
@@ -103,6 +103,32 @@ int cdns_get_vbus(struct cdns *cdns)
 	return vbus;
 }
 
+void cdns_clear_vbus(struct cdns *cdns)
+{
+	u32 reg;
+
+	if (cdns->version != CDNSP_CONTROLLER_V2)
+		return;
+
+	reg = readl(&cdns->otg_cdnsp_regs->override);
+	reg |= OVERRIDE_SESS_VLD_SEL;
+	writel(reg, &cdns->otg_cdnsp_regs->override);
+}
+EXPORT_SYMBOL_GPL(cdns_clear_vbus);
+
+void cdns_set_vbus(struct cdns *cdns)
+{
+	u32 reg;
+
+	if (cdns->version != CDNSP_CONTROLLER_V2)
+		return;
+
+	reg = readl(&cdns->otg_cdnsp_regs->override);
+	reg &= ~OVERRIDE_SESS_VLD_SEL;
+	writel(reg, &cdns->otg_cdnsp_regs->override);
+}
+EXPORT_SYMBOL_GPL(cdns_set_vbus);
+
 bool cdns_is_host(struct cdns *cdns)
 {
 	if (cdns->dr_mode == USB_DR_MODE_HOST)
@@ -449,5 +475,6 @@ int cdns_drd_init(struct cdns *cdns)
 int cdns_drd_exit(struct cdns *cdns)
 {
 	cdns_otg_disable_irq(cdns);
+
 	return 0;
 }
diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
index 838b17c6a45b..9724acdecbbb 100644
--- a/drivers/usb/cdns3/drd.h
+++ b/drivers/usb/cdns3/drd.h
@@ -206,6 +206,8 @@ bool cdns_is_host(struct cdns *cdns);
 bool cdns_is_device(struct cdns *cdns);
 int cdns_get_id(struct cdns *cdns);
 int cdns_get_vbus(struct cdns *cdns);
+void cdns_clear_vbus(struct cdns *cdns);
+void cdns_set_vbus(struct cdns *cdns);
 int cdns_drd_init(struct cdns *cdns);
 int cdns_drd_exit(struct cdns *cdns);
 int cdns_drd_update_mode(struct cdns *cdns);
diff --git a/drivers/usb/cdns3/gadget-export.h b/drivers/usb/cdns3/gadget-export.h
index 0f7cb2a92c9a..c37b6269b001 100644
--- a/drivers/usb/cdns3/gadget-export.h
+++ b/drivers/usb/cdns3/gadget-export.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Cadence USBSS DRD Driver - Gadget Export APIs.
+ * Cadence USBSS and USBSSP DRD Driver - Gadget Export APIs.
  *
  * Copyright (C) 2017 NXP
  * Copyright (C) 2017-2018 NXP
@@ -10,7 +10,19 @@
 #ifndef __LINUX_CDNS3_GADGET_EXPORT
 #define __LINUX_CDNS3_GADGET_EXPORT
 
-#ifdef CONFIG_USB_CDNS3_GADGET
+#if IS_ENABLED(CONFIG_USB_CDNSP_GADGET)
+
+int cdnsp_gadget_init(struct cdns *cdns);
+#else
+
+static inline int cdnsp_gadget_init(struct cdns *cdns)
+{
+	return -ENXIO;
+}
+
+#endif /* CONFIG_USB_CDNSP_GADGET */
+
+#if IS_ENABLED(CONFIG_USB_CDNS3_GADGET)
 
 int cdns3_gadget_init(struct cdns *cdns);
 #else
@@ -20,6 +32,6 @@ static inline int cdns3_gadget_init(struct cdns *cdns)
 	return -ENXIO;
 }
 
-#endif
+#endif /* CONFIG_USB_CDNS3_GADGET */
 
 #endif /* __LINUX_CDNS3_GADGET_EXPORT */
diff --git a/drivers/usb/cdns3/host-export.h b/drivers/usb/cdns3/host-export.h
index 744a4d4c4fb8..087e1921e1f5 100644
--- a/drivers/usb/cdns3/host-export.h
+++ b/drivers/usb/cdns3/host-export.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Cadence USBSS DRD Driver - Host Export APIs
+ * Cadence USBSS and USBSSP DRD Driver - Host Export APIs
  *
  * Copyright (C) 2017-2018 NXP
  *
@@ -9,8 +9,9 @@
 #ifndef __LINUX_CDNS3_HOST_EXPORT
 #define __LINUX_CDNS3_HOST_EXPORT
 
+#if IS_ENABLED(CONFIG_USB_CDNS_HOST)
+
 struct usb_hcd;
-#ifdef CONFIG_USB_CDNS3_HOST
 
 int cdns_host_init(struct cdns *cdns);
 int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd);
@@ -28,6 +29,6 @@ static inline int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
 	return 0;
 }
 
-#endif /* CONFIG_USB_CDNS3_HOST */
+#endif /* USB_CDNS_HOST */
 
 #endif /* __LINUX_CDNS3_HOST_EXPORT */
