Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 19390 insertions, 0 deletions

diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
new file mode 100644
index 0000000000..0a514b5915
--- /dev/null
+++ b/drivers/usb/cdns3/Kconfig
@@ -0,0 +1,133 @@
+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 USB_CDNS_HOST
+	bool
+
+if USB_CDNS_SUPPORT
+
+config USB_CDNS3
+	tristate "Cadence USB3 Dual-Role Controller"
+	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
+
+config USB_CDNS3_GADGET
+	bool "Cadence USB3 device controller"
+	depends on USB_GADGET=y || USB_GADGET=USB_CDNS3
+	help
+	  Say Y here to enable device controller functionality of the
+	  Cadence USBSS-DEV driver.
+
+	  This controller supports FF, HS and SS mode. It doesn't support
+	  LS and SSP mode.
+
+config USB_CDNS3_HOST
+	bool "Cadence USB3 host controller"
+	depends on USB=y || USB=USB_CDNS3
+	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 will use
+	  standard XHCI driver.
+
+config USB_CDNS3_PCI_WRAP
+	tristate "Cadence USB3 support on PCIe-based platforms"
+	depends on USB_PCI && ACPI
+	default USB_CDNS3
+	help
+	  If you're using the USBSS Core IP with a PCIe, please say
+	  'Y' or 'M' here.
+
+	  If you choose to build this driver as module it will
+	  be dynamically linked and module will be called cdns3-pci.ko
+
+config USB_CDNS3_TI
+	tristate "Cadence USB3 support on TI platforms"
+	depends on ARCH_K3 || COMPILE_TEST
+	default USB_CDNS3
+	help
+	  Say 'Y' or 'M' here if you are building for Texas Instruments
+	  platforms that contain Cadence USB3 controller core.
+
+	  e.g. J721e.
+
+config USB_CDNS3_IMX
+	tristate "Cadence USB3 support on NXP i.MX platforms"
+	depends on ARCH_MXC || COMPILE_TEST
+	default USB_CDNS3
+	help
+	  Say 'Y' or 'M' here if you are building for NXP i.MX
+	  platforms that contain Cadence USB3 controller core.
+
+	  For example, imx8qm and imx8qxp.
+
+config USB_CDNS3_STARFIVE
+	tristate "Cadence USB3 support on StarFive SoC platforms"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	help
+	  Say 'Y' or 'M' here if you are building for StarFive SoCs
+	  platforms that contain Cadence USB3 controller core.
+
+	  e.g. JH7110.
+
+	  If you choose to build this driver as module it will
+	  be dynamically linked and module will be called cdns3-starfive.ko
+endif
+
+if USB_CDNS_SUPPORT
+
+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
new file mode 100644
index 0000000000..48dfae75b5
--- /dev/null
+++ b/drivers/usb/cdns3/Makefile
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0
+# define_trace.h needs to know how to find our header
+CFLAGS_cdns3-trace.o				:= -I$(src)
+CFLAGS_cdnsp-trace.o				:= -I$(src)
+
+cdns-usb-common-y				:= core.o drd.o
+cdns3-y						:= cdns3-plat.o
+
+ifeq ($(CONFIG_USB),m)
+obj-m						+= cdns-usb-common.o
+obj-m						+= cdns3.o
+else
+obj-$(CONFIG_USB_CDNS_SUPPORT)			+= cdns-usb-common.o
+obj-$(CONFIG_USB_CDNS3)				+= cdns3.o
+endif
+
+cdns-usb-common-$(CONFIG_USB_CDNS_HOST) 	+= host.o
+cdns3-$(CONFIG_USB_CDNS3_GADGET)		+= cdns3-gadget.o cdns3-ep0.o
+
+ifneq ($(CONFIG_USB_CDNS3_GADGET),)
+cdns3-$(CONFIG_TRACING)				+= cdns3-trace.o
+endif
+
+obj-$(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-$(CONFIG_USB_CDNS3_STARFIVE)		+= cdns3-starfive.o
+
+cdnsp-udc-pci-y					:= cdnsp-pci.o
+
+ifdef CONFIG_USB_CDNSP_PCI
+ifeq ($(CONFIG_USB),m)
+obj-m						+= cdnsp-udc-pci.o
+else
+obj-$(CONFIG_USB_CDNSP_PCI) 			+= cdnsp-udc-pci.o
+endif
+endif
+
+cdnsp-udc-pci-$(CONFIG_USB_CDNSP_GADGET)	+= cdnsp-ring.o cdnsp-gadget.o \
+						   cdnsp-mem.o cdnsp-ep0.o
+
+ifneq ($(CONFIG_USB_CDNSP_GADGET),)
+cdnsp-udc-pci-$(CONFIG_TRACING)			+= cdnsp-trace.o
+endif
diff --git a/drivers/usb/cdns3/cdns3-debug.h b/drivers/usb/cdns3/cdns3-debug.h
new file mode 100644
index 0000000000..4618cfe85a
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-debug.h
@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USBSS DRD Driver.
+ * Debug header file.
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+#ifndef __LINUX_CDNS3_DEBUG
+#define __LINUX_CDNS3_DEBUG
+
+#include "core.h"
+
+static inline char *cdns3_decode_usb_irq(char *str,
+					 enum usb_device_speed speed,
+					 u32 usb_ists)
+{
+	int ret;
+
+	ret = sprintf(str, "IRQ %08x = ", usb_ists);
+
+	if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) {
+		ret += sprintf(str + ret, "Connection %s\n",
+			       usb_speed_string(speed));
+	}
+	if (usb_ists & USB_ISTS_DIS2I || usb_ists & USB_ISTS_DISI)
+		ret += sprintf(str + ret, "Disconnection ");
+	if (usb_ists & USB_ISTS_L2ENTI)
+		ret += sprintf(str + ret, "suspended ");
+	if (usb_ists & USB_ISTS_L1ENTI)
+		ret += sprintf(str + ret, "L1 enter ");
+	if (usb_ists & USB_ISTS_L1EXTI)
+		ret += sprintf(str + ret, "L1 exit ");
+	if (usb_ists & USB_ISTS_L2ENTI)
+		ret += sprintf(str + ret, "L2 enter ");
+	if (usb_ists & USB_ISTS_L2EXTI)
+		ret += sprintf(str + ret, "L2 exit ");
+	if (usb_ists & USB_ISTS_U3EXTI)
+		ret += sprintf(str + ret, "U3 exit ");
+	if (usb_ists & USB_ISTS_UWRESI)
+		ret += sprintf(str + ret, "Warm Reset ");
+	if (usb_ists & USB_ISTS_UHRESI)
+		ret += sprintf(str + ret, "Hot Reset ");
+	if (usb_ists & USB_ISTS_U2RESI)
+		ret += sprintf(str + ret, "Reset");
+
+	return str;
+}
+
+static inline  char *cdns3_decode_ep_irq(char *str,
+					 u32 ep_sts,
+					 const char *ep_name)
+{
+	int ret;
+
+	ret = sprintf(str, "IRQ for %s: %08x ", ep_name, ep_sts);
+
+	if (ep_sts & EP_STS_SETUP)
+		ret += sprintf(str + ret, "SETUP ");
+	if (ep_sts & EP_STS_IOC)
+		ret += sprintf(str + ret, "IOC ");
+	if (ep_sts & EP_STS_ISP)
+		ret += sprintf(str + ret, "ISP ");
+	if (ep_sts & EP_STS_DESCMIS)
+		ret += sprintf(str + ret, "DESCMIS ");
+	if (ep_sts & EP_STS_STREAMR)
+		ret += sprintf(str + ret, "STREAMR ");
+	if (ep_sts & EP_STS_MD_EXIT)
+		ret += sprintf(str + ret, "MD_EXIT ");
+	if (ep_sts & EP_STS_TRBERR)
+		ret += sprintf(str + ret, "TRBERR ");
+	if (ep_sts & EP_STS_NRDY)
+		ret += sprintf(str + ret, "NRDY ");
+	if (ep_sts & EP_STS_PRIME)
+		ret += sprintf(str + ret, "PRIME ");
+	if (ep_sts & EP_STS_SIDERR)
+		ret += sprintf(str + ret, "SIDERRT ");
+	if (ep_sts & EP_STS_OUTSMM)
+		ret += sprintf(str + ret, "OUTSMM ");
+	if (ep_sts & EP_STS_ISOERR)
+		ret += sprintf(str + ret, "ISOERR ");
+	if (ep_sts & EP_STS_IOT)
+		ret += sprintf(str + ret, "IOT ");
+
+	return str;
+}
+
+static inline char *cdns3_decode_epx_irq(char *str,
+					 char *ep_name,
+					 u32 ep_sts)
+{
+	return cdns3_decode_ep_irq(str, ep_sts, ep_name);
+}
+
+static inline char *cdns3_decode_ep0_irq(char *str,
+					 int dir,
+					 u32 ep_sts)
+{
+	return cdns3_decode_ep_irq(str, ep_sts,
+				   dir ? "ep0IN" : "ep0OUT");
+}
+
+/**
+ * Debug a transfer ring.
+ *
+ * Prints out all TRBs in the endpoint ring, even those after the Link TRB.
+ *.
+ */
+static inline char *cdns3_dbg_ring(struct cdns3_endpoint *priv_ep, char *str)
+{
+	dma_addr_t addr = priv_ep->trb_pool_dma;
+	struct cdns3_trb *trb;
+	int trb_per_sector;
+	int ret = 0;
+	int i;
+
+	trb_per_sector = GET_TRBS_PER_SEGMENT(priv_ep->type);
+
+	trb = &priv_ep->trb_pool[priv_ep->dequeue];
+	ret += sprintf(str + ret, "\n\t\tRing contents for %s:", priv_ep->name);
+
+	ret += sprintf(str + ret,
+		       "\n\t\tRing deq index: %d, trb: %p (virt), 0x%llx (dma)\n",
+		       priv_ep->dequeue, trb,
+		       (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
+
+	trb = &priv_ep->trb_pool[priv_ep->enqueue];
+	ret += sprintf(str + ret,
+		       "\t\tRing enq index: %d, trb: %p (virt), 0x%llx (dma)\n",
+		       priv_ep->enqueue, trb,
+		       (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
+
+	ret += sprintf(str + ret,
+		       "\t\tfree trbs: %d, CCS=%d, PCS=%d\n",
+		       priv_ep->free_trbs, priv_ep->ccs, priv_ep->pcs);
+
+	if (trb_per_sector > TRBS_PER_SEGMENT) {
+		sprintf(str + ret, "\t\tTransfer ring %d too big\n",
+			trb_per_sector);
+		return str;
+	}
+
+	for (i = 0; i < trb_per_sector; ++i) {
+		trb = &priv_ep->trb_pool[i];
+		ret += sprintf(str + ret,
+			"\t\t@%pad %08x %08x %08x\n", &addr,
+			le32_to_cpu(trb->buffer),
+			le32_to_cpu(trb->length),
+			le32_to_cpu(trb->control));
+		addr += sizeof(*trb);
+	}
+
+	return str;
+}
+
+#endif /*__LINUX_CDNS3_DEBUG*/
diff --git a/drivers/usb/cdns3/cdns3-ep0.c b/drivers/usb/cdns3/cdns3-ep0.c
new file mode 100644
index 0000000000..e29989d57b
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-ep0.c
@@ -0,0 +1,895 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - gadget side.
+ *
+ * Copyright (C) 2018 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Pawel Jez <pjez@cadence.com>,
+ *          Pawel Laszczak <pawell@cadence.com>
+ *          Peter Chen <peter.chen@nxp.com>
+ */
+
+#include <linux/usb/composite.h>
+#include <linux/iopoll.h>
+
+#include "cdns3-gadget.h"
+#include "cdns3-trace.h"
+
+static struct usb_endpoint_descriptor cdns3_gadget_ep0_desc = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bmAttributes =	USB_ENDPOINT_XFER_CONTROL,
+};
+
+/**
+ * cdns3_ep0_run_transfer - Do transfer on default endpoint hardware
+ * @priv_dev: extended gadget object
+ * @dma_addr: physical address where data is/will be stored
+ * @length: data length
+ * @erdy: set it to 1 when ERDY packet should be sent -
+ *        exit from flow control state
+ * @zlp: add zero length packet
+ */
+static void cdns3_ep0_run_transfer(struct cdns3_device *priv_dev,
+				   dma_addr_t dma_addr,
+				   unsigned int length, int erdy, int zlp)
+{
+	struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+
+	priv_ep->trb_pool[0].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
+	priv_ep->trb_pool[0].length = cpu_to_le32(TRB_LEN(length));
+
+	if (zlp) {
+		priv_ep->trb_pool[0].control = cpu_to_le32(TRB_CYCLE | TRB_TYPE(TRB_NORMAL));
+		priv_ep->trb_pool[1].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
+		priv_ep->trb_pool[1].length = cpu_to_le32(TRB_LEN(0));
+		priv_ep->trb_pool[1].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
+		    TRB_TYPE(TRB_NORMAL));
+	} else {
+		priv_ep->trb_pool[0].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
+		    TRB_TYPE(TRB_NORMAL));
+		priv_ep->trb_pool[1].control = 0;
+	}
+
+	trace_cdns3_prepare_trb(priv_ep, priv_ep->trb_pool);
+
+	cdns3_select_ep(priv_dev, priv_dev->ep0_data_dir);
+
+	writel(EP_STS_TRBERR, &regs->ep_sts);
+	writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), &regs->ep_traddr);
+	trace_cdns3_doorbell_ep0(priv_dev->ep0_data_dir ? "ep0in" : "ep0out",
+				 readl(&regs->ep_traddr));
+
+	/* TRB should be prepared before starting transfer. */
+	writel(EP_CMD_DRDY, &regs->ep_cmd);
+
+	/* Resume controller before arming transfer. */
+	__cdns3_gadget_wakeup(priv_dev);
+
+	if (erdy)
+		writel(EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
+}
+
+/**
+ * cdns3_ep0_delegate_req - Returns status of handling setup packet
+ * Setup is handled by gadget driver
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns zero on success or negative value on failure
+ */
+static int cdns3_ep0_delegate_req(struct cdns3_device *priv_dev,
+				  struct usb_ctrlrequest *ctrl_req)
+{
+	int ret;
+
+	spin_unlock(&priv_dev->lock);
+	priv_dev->setup_pending = 1;
+	ret = priv_dev->gadget_driver->setup(&priv_dev->gadget, ctrl_req);
+	priv_dev->setup_pending = 0;
+	spin_lock(&priv_dev->lock);
+	return ret;
+}
+
+static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
+{
+	priv_dev->ep0_data_dir = 0;
+	priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
+	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
+			       sizeof(struct usb_ctrlrequest), 0, 0);
+}
+
+static void cdns3_ep0_complete_setup(struct cdns3_device *priv_dev,
+				     u8 send_stall, u8 send_erdy)
+{
+	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+	struct usb_request *request;
+
+	request = cdns3_next_request(&priv_ep->pending_req_list);
+	if (request)
+		list_del_init(&request->list);
+
+	if (send_stall) {
+		trace_cdns3_halt(priv_ep, send_stall, 0);
+		/* set_stall on ep0 */
+		cdns3_select_ep(priv_dev, 0x00);
+		writel(EP_CMD_SSTALL, &priv_dev->regs->ep_cmd);
+	} else {
+		cdns3_prepare_setup_packet(priv_dev);
+	}
+
+	priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
+	writel((send_erdy ? EP_CMD_ERDY : 0) | EP_CMD_REQ_CMPL,
+	       &priv_dev->regs->ep_cmd);
+}
+
+/**
+ * cdns3_req_ep0_set_configuration - Handling of SET_CONFIG standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, USB_GADGET_DELAYED_STATUS on deferred status stage,
+ * error code on error
+ */
+static int cdns3_req_ep0_set_configuration(struct cdns3_device *priv_dev,
+					   struct usb_ctrlrequest *ctrl_req)
+{
+	enum usb_device_state device_state = priv_dev->gadget.state;
+	u32 config = le16_to_cpu(ctrl_req->wValue);
+	int result = 0;
+
+	switch (device_state) {
+	case USB_STATE_ADDRESS:
+		result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+
+		if (result || !config)
+			goto reset_config;
+
+		break;
+	case USB_STATE_CONFIGURED:
+		result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+		if (!config && !result)
+			goto reset_config;
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+
+reset_config:
+	if (result != USB_GADGET_DELAYED_STATUS)
+		cdns3_hw_reset_eps_config(priv_dev);
+
+	usb_gadget_set_state(&priv_dev->gadget,
+			     USB_STATE_ADDRESS);
+
+	return result;
+}
+
+/**
+ * cdns3_req_ep0_set_address - Handling of SET_ADDRESS standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_address(struct cdns3_device *priv_dev,
+				     struct usb_ctrlrequest *ctrl_req)
+{
+	enum usb_device_state device_state = priv_dev->gadget.state;
+	u32 reg;
+	u32 addr;
+
+	addr = le16_to_cpu(ctrl_req->wValue);
+
+	if (addr > USB_DEVICE_MAX_ADDRESS) {
+		dev_err(priv_dev->dev,
+			"Device address (%d) cannot be greater than %d\n",
+			addr, USB_DEVICE_MAX_ADDRESS);
+		return -EINVAL;
+	}
+
+	if (device_state == USB_STATE_CONFIGURED) {
+		dev_err(priv_dev->dev,
+			"can't set_address from configured state\n");
+		return -EINVAL;
+	}
+
+	reg = readl(&priv_dev->regs->usb_cmd);
+
+	writel(reg | USB_CMD_FADDR(addr) | USB_CMD_SET_ADDR,
+	       &priv_dev->regs->usb_cmd);
+
+	usb_gadget_set_state(&priv_dev->gadget,
+			     (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));
+
+	return 0;
+}
+
+/**
+ * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
+				    struct usb_ctrlrequest *ctrl)
+{
+	struct cdns3_endpoint *priv_ep;
+	__le16 *response_pkt;
+	u16 usb_status = 0;
+	u32 recip;
+	u8 index;
+
+	recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+	switch (recip) {
+	case USB_RECIP_DEVICE:
+		/* self powered */
+		if (priv_dev->is_selfpowered)
+			usb_status = BIT(USB_DEVICE_SELF_POWERED);
+
+		if (priv_dev->wake_up_flag)
+			usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
+
+		if (priv_dev->gadget.speed != USB_SPEED_SUPER)
+			break;
+
+		if (priv_dev->u1_allowed)
+			usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);
+
+		if (priv_dev->u2_allowed)
+			usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);
+
+		break;
+	case USB_RECIP_INTERFACE:
+		return cdns3_ep0_delegate_req(priv_dev, ctrl);
+	case USB_RECIP_ENDPOINT:
+		index = cdns3_ep_addr_to_index(le16_to_cpu(ctrl->wIndex));
+		priv_ep = priv_dev->eps[index];
+
+		/* check if endpoint is stalled or stall is pending */
+		cdns3_select_ep(priv_dev, le16_to_cpu(ctrl->wIndex));
+		if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)) ||
+		    (priv_ep->flags & EP_STALL_PENDING))
+			usb_status =  BIT(USB_ENDPOINT_HALT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	response_pkt = (__le16 *)priv_dev->setup_buf;
+	*response_pkt = cpu_to_le16(usb_status);
+
+	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
+			       sizeof(*response_pkt), 1, 0);
+	return 0;
+}
+
+static int cdns3_ep0_feature_handle_device(struct cdns3_device *priv_dev,
+					   struct usb_ctrlrequest *ctrl,
+					   int set)
+{
+	enum usb_device_state state;
+	enum usb_device_speed speed;
+	int ret = 0;
+	u32 wValue;
+	u16 tmode;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	state = priv_dev->gadget.state;
+	speed = priv_dev->gadget.speed;
+
+	switch (wValue) {
+	case USB_DEVICE_REMOTE_WAKEUP:
+		priv_dev->wake_up_flag = !!set;
+		break;
+	case USB_DEVICE_U1_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
+			return -EINVAL;
+
+		priv_dev->u1_allowed = !!set;
+		break;
+	case USB_DEVICE_U2_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
+			return -EINVAL;
+
+		priv_dev->u2_allowed = !!set;
+		break;
+	case USB_DEVICE_LTM_ENABLE:
+		ret = -EINVAL;
+		break;
+	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 >>= 8;
+		switch (tmode) {
+		case USB_TEST_J:
+		case USB_TEST_K:
+		case USB_TEST_SE0_NAK:
+		case USB_TEST_PACKET:
+			cdns3_set_register_bit(&priv_dev->regs->usb_cmd,
+					       USB_CMD_STMODE |
+					       USB_STS_TMODE_SEL(tmode - 1));
+			break;
+		default:
+			ret = -EINVAL;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cdns3_ep0_feature_handle_intf(struct cdns3_device *priv_dev,
+					 struct usb_ctrlrequest *ctrl,
+					 int set)
+{
+	u32 wValue;
+	int ret = 0;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+
+	switch (wValue) {
+	case USB_INTRF_FUNC_SUSPEND:
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cdns3_ep0_feature_handle_endpoint(struct cdns3_device *priv_dev,
+					     struct usb_ctrlrequest *ctrl,
+					     int set)
+{
+	struct cdns3_endpoint *priv_ep;
+	int ret = 0;
+	u8 index;
+
+	if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
+		return -EINVAL;
+
+	if (!(le16_to_cpu(ctrl->wIndex) & ~USB_DIR_IN))
+		return 0;
+
+	index = cdns3_ep_addr_to_index(le16_to_cpu(ctrl->wIndex));
+	priv_ep = priv_dev->eps[index];
+
+	cdns3_select_ep(priv_dev, le16_to_cpu(ctrl->wIndex));
+
+	if (set)
+		__cdns3_gadget_ep_set_halt(priv_ep);
+	else if (!(priv_ep->flags & EP_WEDGE))
+		ret = __cdns3_gadget_ep_clear_halt(priv_ep);
+
+	cdns3_select_ep(priv_dev, 0x00);
+
+	return ret;
+}
+
+/**
+ * cdns3_req_ep0_handle_feature -
+ * Handling of GET/SET_FEATURE standard USB request
+ *
+ * @priv_dev: extended gadget object
+ * @ctrl: pointer to received setup packet
+ * @set: must be set to 1 for SET_FEATURE request
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_handle_feature(struct cdns3_device *priv_dev,
+					struct usb_ctrlrequest *ctrl,
+					int set)
+{
+	int ret = 0;
+	u32 recip;
+
+	recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+	switch (recip) {
+	case USB_RECIP_DEVICE:
+		ret = cdns3_ep0_feature_handle_device(priv_dev, ctrl, set);
+		break;
+	case USB_RECIP_INTERFACE:
+		ret = cdns3_ep0_feature_handle_intf(priv_dev, ctrl, set);
+		break;
+	case USB_RECIP_ENDPOINT:
+		ret = cdns3_ep0_feature_handle_endpoint(priv_dev, ctrl, set);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+/**
+ * cdns3_req_ep0_set_sel - Handling of SET_SEL standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_sel(struct cdns3_device *priv_dev,
+				 struct usb_ctrlrequest *ctrl_req)
+{
+	if (priv_dev->gadget.state < USB_STATE_ADDRESS)
+		return -EINVAL;
+
+	if (le16_to_cpu(ctrl_req->wLength) != 6) {
+		dev_err(priv_dev->dev, "Set SEL should be 6 bytes, got %d\n",
+			ctrl_req->wLength);
+		return -EINVAL;
+	}
+
+	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma, 6, 1, 0);
+	return 0;
+}
+
+/**
+ * cdns3_req_ep0_set_isoch_delay -
+ * Handling of GET_ISOCH_DELAY standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_isoch_delay(struct cdns3_device *priv_dev,
+					 struct usb_ctrlrequest *ctrl_req)
+{
+	if (ctrl_req->wIndex || ctrl_req->wLength)
+		return -EINVAL;
+
+	priv_dev->isoch_delay = le16_to_cpu(ctrl_req->wValue);
+
+	return 0;
+}
+
+/**
+ * cdns3_ep0_standard_request - Handling standard USB requests
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_ep0_standard_request(struct cdns3_device *priv_dev,
+				      struct usb_ctrlrequest *ctrl_req)
+{
+	int ret;
+
+	switch (ctrl_req->bRequest) {
+	case USB_REQ_SET_ADDRESS:
+		ret = cdns3_req_ep0_set_address(priv_dev, ctrl_req);
+		break;
+	case USB_REQ_SET_CONFIGURATION:
+		ret = cdns3_req_ep0_set_configuration(priv_dev, ctrl_req);
+		break;
+	case USB_REQ_GET_STATUS:
+		ret = cdns3_req_ep0_get_status(priv_dev, ctrl_req);
+		break;
+	case USB_REQ_CLEAR_FEATURE:
+		ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 0);
+		break;
+	case USB_REQ_SET_FEATURE:
+		ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 1);
+		break;
+	case USB_REQ_SET_SEL:
+		ret = cdns3_req_ep0_set_sel(priv_dev, ctrl_req);
+		break;
+	case USB_REQ_SET_ISOCH_DELAY:
+		ret = cdns3_req_ep0_set_isoch_delay(priv_dev, ctrl_req);
+		break;
+	default:
+		ret = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+		break;
+	}
+
+	return ret;
+}
+
+static void __pending_setup_status_handler(struct cdns3_device *priv_dev)
+{
+	struct usb_request *request = priv_dev->pending_status_request;
+
+	if (priv_dev->status_completion_no_call && request &&
+	    request->complete) {
+		request->complete(&priv_dev->eps[0]->endpoint, request);
+		priv_dev->status_completion_no_call = 0;
+	}
+}
+
+void cdns3_pending_setup_status_handler(struct work_struct *work)
+{
+	struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
+			pending_status_wq);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	__pending_setup_status_handler(priv_dev);
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+}
+
+/**
+ * cdns3_ep0_setup_phase - Handling setup USB requests
+ * @priv_dev: extended gadget object
+ */
+static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
+{
+	struct usb_ctrlrequest *ctrl = priv_dev->setup_buf;
+	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+	int result;
+
+	priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;
+
+	trace_cdns3_ctrl_req(ctrl);
+
+	if (!list_empty(&priv_ep->pending_req_list)) {
+		struct usb_request *request;
+
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+		priv_ep->dir = priv_dev->ep0_data_dir;
+		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+				      -ECONNRESET);
+	}
+
+	if (le16_to_cpu(ctrl->wLength))
+		priv_dev->ep0_stage = CDNS3_DATA_STAGE;
+	else
+		priv_dev->ep0_stage = CDNS3_STATUS_STAGE;
+
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+		result = cdns3_ep0_standard_request(priv_dev, ctrl);
+	else
+		result = cdns3_ep0_delegate_req(priv_dev, ctrl);
+
+	if (result == USB_GADGET_DELAYED_STATUS)
+		return;
+
+	if (result < 0)
+		cdns3_ep0_complete_setup(priv_dev, 1, 1);
+	else if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE)
+		cdns3_ep0_complete_setup(priv_dev, 0, 1);
+}
+
+static void cdns3_transfer_completed(struct cdns3_device *priv_dev)
+{
+	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+
+	if (!list_empty(&priv_ep->pending_req_list)) {
+		struct usb_request *request;
+
+		trace_cdns3_complete_trb(priv_ep, priv_ep->trb_pool);
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+
+		request->actual =
+			TRB_LEN(le32_to_cpu(priv_ep->trb_pool->length));
+
+		priv_ep->dir = priv_dev->ep0_data_dir;
+		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request), 0);
+	}
+
+	cdns3_ep0_complete_setup(priv_dev, 0, 0);
+}
+
+/**
+ * cdns3_check_new_setup - Check if controller receive new SETUP packet.
+ * @priv_dev: extended gadget object
+ *
+ * The SETUP packet can be kept in on-chip memory or in system memory.
+ */
+static bool cdns3_check_new_setup(struct cdns3_device *priv_dev)
+{
+	u32 ep_sts_reg;
+
+	cdns3_select_ep(priv_dev, USB_DIR_OUT);
+	ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+
+	return !!(ep_sts_reg & (EP_STS_SETUP | EP_STS_STPWAIT));
+}
+
+/**
+ * cdns3_check_ep0_interrupt_proceed - Processes interrupt related to endpoint 0
+ * @priv_dev: extended gadget object
+ * @dir: USB_DIR_IN for IN direction, USB_DIR_OUT for OUT direction
+ */
+void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
+{
+	u32 ep_sts_reg;
+
+	cdns3_select_ep(priv_dev, dir);
+
+	ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+	writel(ep_sts_reg, &priv_dev->regs->ep_sts);
+
+	trace_cdns3_ep0_irq(priv_dev, ep_sts_reg);
+
+	__pending_setup_status_handler(priv_dev);
+
+	if (ep_sts_reg & EP_STS_SETUP)
+		priv_dev->wait_for_setup = 1;
+
+	if (priv_dev->wait_for_setup && ep_sts_reg & EP_STS_IOC) {
+		priv_dev->wait_for_setup = 0;
+		cdns3_ep0_setup_phase(priv_dev);
+	} else if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
+		priv_dev->ep0_data_dir = dir;
+		cdns3_transfer_completed(priv_dev);
+	}
+
+	if (ep_sts_reg & EP_STS_DESCMIS) {
+		if (dir == 0 && !priv_dev->setup_pending)
+			cdns3_prepare_setup_packet(priv_dev);
+	}
+}
+
+/**
+ * cdns3_gadget_ep0_enable
+ * @ep: pointer to endpoint zero object
+ * @desc: pointer to usb endpoint descriptor
+ *
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active
+ */
+static int cdns3_gadget_ep0_enable(struct usb_ep *ep,
+				   const struct usb_endpoint_descriptor *desc)
+{
+	return -EINVAL;
+}
+
+/**
+ * cdns3_gadget_ep0_disable
+ * @ep: pointer to endpoint zero object
+ *
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active
+ */
+static int cdns3_gadget_ep0_disable(struct usb_ep *ep)
+{
+	return -EINVAL;
+}
+
+/**
+ * cdns3_gadget_ep0_set_halt
+ * @ep: pointer to endpoint zero object
+ * @value: 1 for set stall, 0 for clear stall
+ *
+ * Returns 0
+ */
+static int cdns3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
+{
+	/* TODO */
+	return 0;
+}
+
+/**
+ * cdns3_gadget_ep0_queue - Transfer data on endpoint zero
+ * @ep: pointer to endpoint zero object
+ * @request: pointer to request object
+ * @gfp_flags: gfp flags
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep0_queue(struct usb_ep *ep,
+				  struct usb_request *request,
+				  gfp_t gfp_flags)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	unsigned long flags;
+	int ret = 0;
+	u8 zlp = 0;
+	int i;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	trace_cdns3_ep0_queue(priv_dev, request);
+
+	/* cancel the request if controller receive new SETUP packet. */
+	if (cdns3_check_new_setup(priv_dev)) {
+		spin_unlock_irqrestore(&priv_dev->lock, flags);
+		return -ECONNRESET;
+	}
+
+	/* send STATUS stage. Should be called only for SET_CONFIGURATION */
+	if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
+		u32 val;
+
+		cdns3_select_ep(priv_dev, 0x00);
+
+		/*
+		 * Configure all non-control EPs which are not enabled by class driver
+		 */
+		for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
+			priv_ep = priv_dev->eps[i];
+			if (priv_ep && priv_ep->flags & EP_CLAIMED &&
+			    !(priv_ep->flags & EP_ENABLED))
+				cdns3_ep_config(priv_ep, 0);
+		}
+
+		cdns3_set_hw_configuration(priv_dev);
+		cdns3_ep0_complete_setup(priv_dev, 0, 1);
+		/* wait until configuration set */
+		ret = readl_poll_timeout_atomic(&priv_dev->regs->usb_sts, val,
+					  val & USB_STS_CFGSTS_MASK, 1, 100);
+		if (ret == -ETIMEDOUT)
+			dev_warn(priv_dev->dev, "timeout for waiting configuration set\n");
+
+		request->actual = 0;
+		priv_dev->status_completion_no_call = true;
+		priv_dev->pending_status_request = request;
+		usb_gadget_set_state(&priv_dev->gadget, USB_STATE_CONFIGURED);
+		spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+		/*
+		 * Since there is no completion interrupt for status stage,
+		 * it needs to call ->completion in software after
+		 * ep0_queue is back.
+		 */
+		queue_work(system_freezable_wq, &priv_dev->pending_status_wq);
+		return ret;
+	}
+
+	if (!list_empty(&priv_ep->pending_req_list)) {
+		dev_err(priv_dev->dev,
+			"can't handle multiple requests for ep0\n");
+		spin_unlock_irqrestore(&priv_dev->lock, flags);
+		return -EBUSY;
+	}
+
+	ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
+					    priv_dev->ep0_data_dir);
+	if (ret) {
+		spin_unlock_irqrestore(&priv_dev->lock, flags);
+		dev_err(priv_dev->dev, "failed to map request\n");
+		return -EINVAL;
+	}
+
+	request->status = -EINPROGRESS;
+	list_add_tail(&request->list, &priv_ep->pending_req_list);
+
+	if (request->zero && request->length &&
+	    (request->length % ep->maxpacket == 0))
+		zlp = 1;
+
+	cdns3_ep0_run_transfer(priv_dev, request->dma, request->length, 1, zlp);
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+	return ret;
+}
+
+/**
+ * cdns3_gadget_ep_set_wedge - Set wedge on selected endpoint
+ * @ep: endpoint object
+ *
+ * Returns 0
+ */
+int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	dev_dbg(priv_dev->dev, "Wedge for %s\n", ep->name);
+	cdns3_gadget_ep_set_halt(ep, 1);
+	priv_ep->flags |= EP_WEDGE;
+
+	return 0;
+}
+
+static const struct usb_ep_ops cdns3_gadget_ep0_ops = {
+	.enable = cdns3_gadget_ep0_enable,
+	.disable = cdns3_gadget_ep0_disable,
+	.alloc_request = cdns3_gadget_ep_alloc_request,
+	.free_request = cdns3_gadget_ep_free_request,
+	.queue = cdns3_gadget_ep0_queue,
+	.dequeue = cdns3_gadget_ep_dequeue,
+	.set_halt = cdns3_gadget_ep0_set_halt,
+	.set_wedge = cdns3_gadget_ep_set_wedge,
+};
+
+/**
+ * cdns3_ep0_config - Configures default endpoint
+ * @priv_dev: extended gadget object
+ *
+ * Functions sets parameters: maximal packet size and enables interrupts
+ */
+void cdns3_ep0_config(struct cdns3_device *priv_dev)
+{
+	struct cdns3_usb_regs __iomem *regs;
+	struct cdns3_endpoint *priv_ep;
+	u32 max_packet_size = 64;
+	u32 ep_cfg;
+
+	regs = priv_dev->regs;
+
+	if (priv_dev->gadget.speed == USB_SPEED_SUPER)
+		max_packet_size = 512;
+
+	priv_ep = priv_dev->eps[0];
+
+	if (!list_empty(&priv_ep->pending_req_list)) {
+		struct usb_request *request;
+
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+		list_del_init(&request->list);
+	}
+
+	priv_dev->u1_allowed = 0;
+	priv_dev->u2_allowed = 0;
+
+	priv_dev->gadget.ep0->maxpacket = max_packet_size;
+	cdns3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(max_packet_size);
+
+	/* init ep out */
+	cdns3_select_ep(priv_dev, USB_DIR_OUT);
+
+	if (priv_dev->dev_ver >= DEV_VER_V3) {
+		cdns3_set_register_bit(&priv_dev->regs->dtrans,
+				       BIT(0) | BIT(16));
+		cdns3_set_register_bit(&priv_dev->regs->tdl_from_trb,
+				       BIT(0) | BIT(16));
+	}
+
+	ep_cfg = EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size);
+
+	if (!(priv_ep->flags & EP_CONFIGURED))
+		writel(ep_cfg, &regs->ep_cfg);
+
+	writel(EP_STS_EN_SETUPEN | EP_STS_EN_DESCMISEN | EP_STS_EN_TRBERREN,
+	       &regs->ep_sts_en);
+
+	/* init ep in */
+	cdns3_select_ep(priv_dev, USB_DIR_IN);
+
+	if (!(priv_ep->flags & EP_CONFIGURED))
+		writel(ep_cfg, &regs->ep_cfg);
+
+	priv_ep->flags |= EP_CONFIGURED;
+
+	writel(EP_STS_EN_SETUPEN | EP_STS_EN_TRBERREN, &regs->ep_sts_en);
+
+	cdns3_set_register_bit(&regs->usb_conf, USB_CONF_U1DS | USB_CONF_U2DS);
+}
+
+/**
+ * cdns3_init_ep0 - Initializes software endpoint 0 of gadget
+ * @priv_dev: extended gadget object
+ * @priv_ep: extended endpoint object
+ *
+ * Returns 0 on success else error code.
+ */
+int cdns3_init_ep0(struct cdns3_device *priv_dev,
+		   struct cdns3_endpoint *priv_ep)
+{
+	sprintf(priv_ep->name, "ep0");
+
+	/* fill linux fields */
+	priv_ep->endpoint.ops = &cdns3_gadget_ep0_ops;
+	priv_ep->endpoint.maxburst = 1;
+	usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
+				   CDNS3_EP0_MAX_PACKET_LIMIT);
+	priv_ep->endpoint.address = 0;
+	priv_ep->endpoint.caps.type_control = 1;
+	priv_ep->endpoint.caps.dir_in = 1;
+	priv_ep->endpoint.caps.dir_out = 1;
+	priv_ep->endpoint.name = priv_ep->name;
+	priv_ep->endpoint.desc = &cdns3_gadget_ep0_desc;
+	priv_dev->gadget.ep0 = &priv_ep->endpoint;
+	priv_ep->type = USB_ENDPOINT_XFER_CONTROL;
+
+	return cdns3_allocate_trb_pool(priv_ep);
+}
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
new file mode 100644
index 0000000000..d140010257
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -0,0 +1,3504 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - gadget side.
+ *
+ * Copyright (C) 2018-2019 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Pawel Jez <pjez@cadence.com>,
+ *          Pawel Laszczak <pawell@cadence.com>
+ *          Peter Chen <peter.chen@nxp.com>
+ */
+
+/*
+ * Work around 1:
+ * At some situations, the controller may get stale data address in TRB
+ * at below sequences:
+ * 1. Controller read TRB includes data address
+ * 2. Software updates TRBs includes data address and Cycle bit
+ * 3. Controller read TRB which includes Cycle bit
+ * 4. DMA run with stale data address
+ *
+ * To fix this problem, driver needs to make the first TRB in TD as invalid.
+ * After preparing all TRBs driver needs to check the position of DMA and
+ * if the DMA point to the first just added TRB and doorbell is 1,
+ * then driver must defer making this TRB as valid. This TRB will be make
+ * as valid during adding next TRB only if DMA is stopped or at TRBERR
+ * interrupt.
+ *
+ * Issue has been fixed in DEV_VER_V3 version of controller.
+ *
+ * Work around 2:
+ * Controller for OUT endpoints has shared on-chip buffers for all incoming
+ * packets, including ep0out. It's FIFO buffer, so packets must be handle by DMA
+ * in correct order. If the first packet in the buffer will not be handled,
+ * then the following packets directed for other endpoints and  functions
+ * will be blocked.
+ * Additionally the packets directed to one endpoint can block entire on-chip
+ * buffers. In this case transfer to other endpoints also will blocked.
+ *
+ * To resolve this issue after raising the descriptor missing interrupt
+ * driver prepares internal usb_request object and use it to arm DMA transfer.
+ *
+ * The problematic situation was observed in case when endpoint has been enabled
+ * but no usb_request were queued. Driver try detects such endpoints and will
+ * use this workaround only for these endpoint.
+ *
+ * Driver use limited number of buffer. This number can be set by macro
+ * CDNS3_WA2_NUM_BUFFERS.
+ *
+ * Such blocking situation was observed on ACM gadget. For this function
+ * host send OUT data packet but ACM function is not prepared for this packet.
+ * It's cause that buffer placed in on chip memory block transfer to other
+ * endpoints.
+ *
+ * Issue has been fixed in DEV_VER_V2 version of controller.
+ *
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/usb/gadget.h>
+#include <linux/module.h>
+#include <linux/dmapool.h>
+#include <linux/iopoll.h>
+#include <linux/property.h>
+
+#include "core.h"
+#include "gadget-export.h"
+#include "cdns3-gadget.h"
+#include "cdns3-trace.h"
+#include "drd.h"
+
+static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
+				   struct usb_request *request,
+				   gfp_t gfp_flags);
+
+static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
+				 struct usb_request *request);
+
+static int cdns3_ep_run_stream_transfer(struct cdns3_endpoint *priv_ep,
+					struct usb_request *request);
+
+/**
+ * cdns3_clear_register_bit - clear bit in given register.
+ * @ptr: address of device controller register to be read and changed
+ * @mask: bits requested to clar
+ */
+static void cdns3_clear_register_bit(void __iomem *ptr, u32 mask)
+{
+	mask = readl(ptr) & ~mask;
+	writel(mask, ptr);
+}
+
+/**
+ * cdns3_set_register_bit - set bit in given register.
+ * @ptr: address of device controller register to be read and changed
+ * @mask: bits requested to set
+ */
+void cdns3_set_register_bit(void __iomem *ptr, u32 mask)
+{
+	mask = readl(ptr) | mask;
+	writel(mask, ptr);
+}
+
+/**
+ * cdns3_ep_addr_to_index - Macro converts endpoint address to
+ * index of endpoint object in cdns3_device.eps[] container
+ * @ep_addr: endpoint address for which endpoint object is required
+ *
+ */
+u8 cdns3_ep_addr_to_index(u8 ep_addr)
+{
+	return (((ep_addr & 0x7F)) + ((ep_addr & USB_DIR_IN) ? 16 : 0));
+}
+
+static int cdns3_get_dma_pos(struct cdns3_device *priv_dev,
+			     struct cdns3_endpoint *priv_ep)
+{
+	int dma_index;
+
+	dma_index = readl(&priv_dev->regs->ep_traddr) - priv_ep->trb_pool_dma;
+
+	return dma_index / TRB_SIZE;
+}
+
+/**
+ * cdns3_next_request - returns next request from list
+ * @list: list containing requests
+ *
+ * Returns request or NULL if no requests in list
+ */
+struct usb_request *cdns3_next_request(struct list_head *list)
+{
+	return list_first_entry_or_null(list, struct usb_request, list);
+}
+
+/**
+ * cdns3_next_align_buf - returns next buffer from list
+ * @list: list containing buffers
+ *
+ * Returns buffer or NULL if no buffers in list
+ */
+static struct cdns3_aligned_buf *cdns3_next_align_buf(struct list_head *list)
+{
+	return list_first_entry_or_null(list, struct cdns3_aligned_buf, list);
+}
+
+/**
+ * cdns3_next_priv_request - returns next request from list
+ * @list: list containing requests
+ *
+ * Returns request or NULL if no requests in list
+ */
+static struct cdns3_request *cdns3_next_priv_request(struct list_head *list)
+{
+	return list_first_entry_or_null(list, struct cdns3_request, list);
+}
+
+/**
+ * cdns3_select_ep - selects endpoint
+ * @priv_dev:  extended gadget object
+ * @ep: endpoint address
+ */
+void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep)
+{
+	if (priv_dev->selected_ep == ep)
+		return;
+
+	priv_dev->selected_ep = ep;
+	writel(ep, &priv_dev->regs->ep_sel);
+}
+
+/**
+ * cdns3_get_tdl - gets current tdl for selected endpoint.
+ * @priv_dev:  extended gadget object
+ *
+ * Before calling this function the appropriate endpoint must
+ * be selected by means of cdns3_select_ep function.
+ */
+static int cdns3_get_tdl(struct cdns3_device *priv_dev)
+{
+	if (priv_dev->dev_ver < DEV_VER_V3)
+		return EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd));
+	else
+		return readl(&priv_dev->regs->ep_tdl);
+}
+
+dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep,
+				 struct cdns3_trb *trb)
+{
+	u32 offset = (char *)trb - (char *)priv_ep->trb_pool;
+
+	return priv_ep->trb_pool_dma + offset;
+}
+
+static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	if (priv_ep->trb_pool) {
+		dma_pool_free(priv_dev->eps_dma_pool,
+			      priv_ep->trb_pool, priv_ep->trb_pool_dma);
+		priv_ep->trb_pool = NULL;
+	}
+}
+
+/**
+ * cdns3_allocate_trb_pool - Allocates TRB's pool for selected endpoint
+ * @priv_ep:  endpoint object
+ *
+ * Function will return 0 on success or -ENOMEM on allocation error
+ */
+int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	int ring_size = TRB_RING_SIZE;
+	int num_trbs = ring_size / TRB_SIZE;
+	struct cdns3_trb *link_trb;
+
+	if (priv_ep->trb_pool && priv_ep->alloc_ring_size < ring_size)
+		cdns3_free_trb_pool(priv_ep);
+
+	if (!priv_ep->trb_pool) {
+		priv_ep->trb_pool = dma_pool_alloc(priv_dev->eps_dma_pool,
+						   GFP_ATOMIC,
+						   &priv_ep->trb_pool_dma);
+
+		if (!priv_ep->trb_pool)
+			return -ENOMEM;
+
+		priv_ep->alloc_ring_size = ring_size;
+	}
+
+	memset(priv_ep->trb_pool, 0, ring_size);
+
+	priv_ep->num_trbs = num_trbs;
+
+	if (!priv_ep->num)
+		return 0;
+
+	/* Initialize the last TRB as Link TRB */
+	link_trb = (priv_ep->trb_pool + (priv_ep->num_trbs - 1));
+
+	if (priv_ep->use_streams) {
+		/*
+		 * For stream capable endpoints driver use single correct TRB.
+		 * The last trb has zeroed cycle bit
+		 */
+		link_trb->control = 0;
+	} else {
+		link_trb->buffer = cpu_to_le32(TRB_BUFFER(priv_ep->trb_pool_dma));
+		link_trb->control = cpu_to_le32(TRB_CYCLE | TRB_TYPE(TRB_LINK) | TRB_TOGGLE);
+	}
+	return 0;
+}
+
+/**
+ * cdns3_ep_stall_flush - Stalls and flushes selected endpoint
+ * @priv_ep: endpoint object
+ *
+ * Endpoint must be selected before call to this function
+ */
+static void cdns3_ep_stall_flush(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	int val;
+
+	trace_cdns3_halt(priv_ep, 1, 1);
+
+	writel(EP_CMD_DFLUSH | EP_CMD_ERDY | EP_CMD_SSTALL,
+	       &priv_dev->regs->ep_cmd);
+
+	/* wait for DFLUSH cleared */
+	readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+				  !(val & EP_CMD_DFLUSH), 1, 1000);
+	priv_ep->flags |= EP_STALLED;
+	priv_ep->flags &= ~EP_STALL_PENDING;
+}
+
+/**
+ * cdns3_hw_reset_eps_config - reset endpoints configuration kept by controller.
+ * @priv_dev: extended gadget object
+ */
+void cdns3_hw_reset_eps_config(struct cdns3_device *priv_dev)
+{
+	int i;
+
+	writel(USB_CONF_CFGRST, &priv_dev->regs->usb_conf);
+
+	cdns3_allow_enable_l1(priv_dev, 0);
+	priv_dev->hw_configured_flag = 0;
+	priv_dev->onchip_used_size = 0;
+	priv_dev->out_mem_is_allocated = 0;
+	priv_dev->wait_for_setup = 0;
+	priv_dev->using_streams = 0;
+
+	for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++)
+		if (priv_dev->eps[i])
+			priv_dev->eps[i]->flags &= ~EP_CONFIGURED;
+}
+
+/**
+ * cdns3_ep_inc_trb - increment a trb index.
+ * @index: Pointer to the TRB index to increment.
+ * @cs: Cycle state
+ * @trb_in_seg: number of TRBs in segment
+ *
+ * The index should never point to the link TRB. After incrementing,
+ * if it is point to the link TRB, wrap around to the beginning and revert
+ * cycle state bit The
+ * link TRB is always at the last TRB entry.
+ */
+static void cdns3_ep_inc_trb(int *index, u8 *cs, int trb_in_seg)
+{
+	(*index)++;
+	if (*index == (trb_in_seg - 1)) {
+		*index = 0;
+		*cs ^=  1;
+	}
+}
+
+/**
+ * cdns3_ep_inc_enq - increment endpoint's enqueue pointer
+ * @priv_ep: The endpoint whose enqueue pointer we're incrementing
+ */
+static void cdns3_ep_inc_enq(struct cdns3_endpoint *priv_ep)
+{
+	priv_ep->free_trbs--;
+	cdns3_ep_inc_trb(&priv_ep->enqueue, &priv_ep->pcs, priv_ep->num_trbs);
+}
+
+/**
+ * cdns3_ep_inc_deq - increment endpoint's dequeue pointer
+ * @priv_ep: The endpoint whose dequeue pointer we're incrementing
+ */
+static void cdns3_ep_inc_deq(struct cdns3_endpoint *priv_ep)
+{
+	priv_ep->free_trbs++;
+	cdns3_ep_inc_trb(&priv_ep->dequeue, &priv_ep->ccs, priv_ep->num_trbs);
+}
+
+/**
+ * cdns3_allow_enable_l1 - enable/disable permits to transition to L1.
+ * @priv_dev: Extended gadget object
+ * @enable: Enable/disable permit to transition to L1.
+ *
+ * If bit USB_CONF_L1EN is set and device receive Extended Token packet,
+ * then controller answer with ACK handshake.
+ * If bit USB_CONF_L1DS is set and device receive Extended Token packet,
+ * then controller answer with NYET handshake.
+ */
+void cdns3_allow_enable_l1(struct cdns3_device *priv_dev, int enable)
+{
+	if (enable)
+		writel(USB_CONF_L1EN, &priv_dev->regs->usb_conf);
+	else
+		writel(USB_CONF_L1DS, &priv_dev->regs->usb_conf);
+}
+
+enum usb_device_speed cdns3_get_speed(struct cdns3_device *priv_dev)
+{
+	u32 reg;
+
+	reg = readl(&priv_dev->regs->usb_sts);
+
+	if (DEV_SUPERSPEED(reg))
+		return USB_SPEED_SUPER;
+	else if (DEV_HIGHSPEED(reg))
+		return USB_SPEED_HIGH;
+	else if (DEV_FULLSPEED(reg))
+		return USB_SPEED_FULL;
+	else if (DEV_LOWSPEED(reg))
+		return USB_SPEED_LOW;
+	return USB_SPEED_UNKNOWN;
+}
+
+/**
+ * cdns3_start_all_request - add to ring all request not started
+ * @priv_dev: Extended gadget object
+ * @priv_ep: The endpoint for whom request will be started.
+ *
+ * Returns return ENOMEM if transfer ring i not enough TRBs to start
+ *         all requests.
+ */
+static int cdns3_start_all_request(struct cdns3_device *priv_dev,
+				   struct cdns3_endpoint *priv_ep)
+{
+	struct usb_request *request;
+	int ret = 0;
+	u8 pending_empty = list_empty(&priv_ep->pending_req_list);
+
+	/*
+	 * If the last pending transfer is INTERNAL
+	 * OR streams are enabled for this endpoint
+	 * do NOT start new transfer till the last one is pending
+	 */
+	if (!pending_empty) {
+		struct cdns3_request *priv_req;
+
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+		priv_req = to_cdns3_request(request);
+		if ((priv_req->flags & REQUEST_INTERNAL) ||
+		    (priv_ep->flags & EP_TDLCHK_EN) ||
+			priv_ep->use_streams) {
+			dev_dbg(priv_dev->dev, "Blocking external request\n");
+			return ret;
+		}
+	}
+
+	while (!list_empty(&priv_ep->deferred_req_list)) {
+		request = cdns3_next_request(&priv_ep->deferred_req_list);
+
+		if (!priv_ep->use_streams) {
+			ret = cdns3_ep_run_transfer(priv_ep, request);
+		} else {
+			priv_ep->stream_sg_idx = 0;
+			ret = cdns3_ep_run_stream_transfer(priv_ep, request);
+		}
+		if (ret)
+			return ret;
+
+		list_move_tail(&request->list, &priv_ep->pending_req_list);
+		if (request->stream_id != 0 || (priv_ep->flags & EP_TDLCHK_EN))
+			break;
+	}
+
+	priv_ep->flags &= ~EP_RING_FULL;
+	return ret;
+}
+
+/*
+ * WA2: Set flag for all not ISOC OUT endpoints. If this flag is set
+ * driver try to detect whether endpoint need additional internal
+ * buffer for unblocking on-chip FIFO buffer. This flag will be cleared
+ * if before first DESCMISS interrupt the DMA will be armed.
+ */
+#define cdns3_wa2_enable_detection(priv_dev, priv_ep, reg) do { \
+	if (!priv_ep->dir && priv_ep->type != USB_ENDPOINT_XFER_ISOC) { \
+		priv_ep->flags |= EP_QUIRK_EXTRA_BUF_DET; \
+		(reg) |= EP_STS_EN_DESCMISEN; \
+	} } while (0)
+
+static void __cdns3_descmiss_copy_data(struct usb_request *request,
+	struct usb_request *descmiss_req)
+{
+	int length = request->actual + descmiss_req->actual;
+	struct scatterlist *s = request->sg;
+
+	if (!s) {
+		if (length <= request->length) {
+			memcpy(&((u8 *)request->buf)[request->actual],
+			       descmiss_req->buf,
+			       descmiss_req->actual);
+			request->actual = length;
+		} else {
+			/* It should never occures */
+			request->status = -ENOMEM;
+		}
+	} else {
+		if (length <= sg_dma_len(s)) {
+			void *p = phys_to_virt(sg_dma_address(s));
+
+			memcpy(&((u8 *)p)[request->actual],
+				descmiss_req->buf,
+				descmiss_req->actual);
+			request->actual = length;
+		} else {
+			request->status = -ENOMEM;
+		}
+	}
+}
+
+/**
+ * cdns3_wa2_descmiss_copy_data - copy data from internal requests to
+ * request queued by class driver.
+ * @priv_ep: extended endpoint object
+ * @request: request object
+ */
+static void cdns3_wa2_descmiss_copy_data(struct cdns3_endpoint *priv_ep,
+					 struct usb_request *request)
+{
+	struct usb_request *descmiss_req;
+	struct cdns3_request *descmiss_priv_req;
+
+	while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+		int chunk_end;
+
+		descmiss_priv_req =
+			cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+		descmiss_req = &descmiss_priv_req->request;
+
+		/* driver can't touch pending request */
+		if (descmiss_priv_req->flags & REQUEST_PENDING)
+			break;
+
+		chunk_end = descmiss_priv_req->flags & REQUEST_INTERNAL_CH;
+		request->status = descmiss_req->status;
+		__cdns3_descmiss_copy_data(request, descmiss_req);
+		list_del_init(&descmiss_priv_req->list);
+		kfree(descmiss_req->buf);
+		cdns3_gadget_ep_free_request(&priv_ep->endpoint, descmiss_req);
+		--priv_ep->wa2_counter;
+
+		if (!chunk_end)
+			break;
+	}
+}
+
+static struct usb_request *cdns3_wa2_gadget_giveback(struct cdns3_device *priv_dev,
+						     struct cdns3_endpoint *priv_ep,
+						     struct cdns3_request *priv_req)
+{
+	if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN &&
+	    priv_req->flags & REQUEST_INTERNAL) {
+		struct usb_request *req;
+
+		req = cdns3_next_request(&priv_ep->deferred_req_list);
+
+		priv_ep->descmis_req = NULL;
+
+		if (!req)
+			return NULL;
+
+		/* unmap the gadget request before copying data */
+		usb_gadget_unmap_request_by_dev(priv_dev->sysdev, req,
+						priv_ep->dir);
+
+		cdns3_wa2_descmiss_copy_data(priv_ep, req);
+		if (!(priv_ep->flags & EP_QUIRK_END_TRANSFER) &&
+		    req->length != req->actual) {
+			/* wait for next part of transfer */
+			/* re-map the gadget request buffer*/
+			usb_gadget_map_request_by_dev(priv_dev->sysdev, req,
+				usb_endpoint_dir_in(priv_ep->endpoint.desc));
+			return NULL;
+		}
+
+		if (req->status == -EINPROGRESS)
+			req->status = 0;
+
+		list_del_init(&req->list);
+		cdns3_start_all_request(priv_dev, priv_ep);
+		return req;
+	}
+
+	return &priv_req->request;
+}
+
+static int cdns3_wa2_gadget_ep_queue(struct cdns3_device *priv_dev,
+				     struct cdns3_endpoint *priv_ep,
+				     struct cdns3_request *priv_req)
+{
+	int deferred = 0;
+
+	/*
+	 * If transfer was queued before DESCMISS appear than we
+	 * can disable handling of DESCMISS interrupt. Driver assumes that it
+	 * can disable special treatment for this endpoint.
+	 */
+	if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
+		u32 reg;
+
+		cdns3_select_ep(priv_dev, priv_ep->num | priv_ep->dir);
+		priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
+		reg = readl(&priv_dev->regs->ep_sts_en);
+		reg &= ~EP_STS_EN_DESCMISEN;
+		trace_cdns3_wa2(priv_ep, "workaround disabled\n");
+		writel(reg, &priv_dev->regs->ep_sts_en);
+	}
+
+	if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
+		u8 pending_empty = list_empty(&priv_ep->pending_req_list);
+		u8 descmiss_empty = list_empty(&priv_ep->wa2_descmiss_req_list);
+
+		/*
+		 *  DESCMISS transfer has been finished, so data will be
+		 *  directly copied from internal allocated usb_request
+		 *  objects.
+		 */
+		if (pending_empty && !descmiss_empty &&
+		    !(priv_req->flags & REQUEST_INTERNAL)) {
+			cdns3_wa2_descmiss_copy_data(priv_ep,
+						     &priv_req->request);
+
+			trace_cdns3_wa2(priv_ep, "get internal stored data");
+
+			list_add_tail(&priv_req->request.list,
+				      &priv_ep->pending_req_list);
+			cdns3_gadget_giveback(priv_ep, priv_req,
+					      priv_req->request.status);
+
+			/*
+			 * Intentionally driver returns positive value as
+			 * correct value. It informs that transfer has
+			 * been finished.
+			 */
+			return EINPROGRESS;
+		}
+
+		/*
+		 * Driver will wait for completion DESCMISS transfer,
+		 * before starts new, not DESCMISS transfer.
+		 */
+		if (!pending_empty && !descmiss_empty) {
+			trace_cdns3_wa2(priv_ep, "wait for pending transfer\n");
+			deferred = 1;
+		}
+
+		if (priv_req->flags & REQUEST_INTERNAL)
+			list_add_tail(&priv_req->list,
+				      &priv_ep->wa2_descmiss_req_list);
+	}
+
+	return deferred;
+}
+
+static void cdns3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_request *priv_req;
+
+	while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+		u8 chain;
+
+		priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+		chain = !!(priv_req->flags & REQUEST_INTERNAL_CH);
+
+		trace_cdns3_wa2(priv_ep, "removes eldest request");
+
+		kfree(priv_req->request.buf);
+		list_del_init(&priv_req->list);
+		cdns3_gadget_ep_free_request(&priv_ep->endpoint,
+					     &priv_req->request);
+		--priv_ep->wa2_counter;
+
+		if (!chain)
+			break;
+	}
+}
+
+/**
+ * cdns3_wa2_descmissing_packet - handles descriptor missing event.
+ * @priv_ep: extended gadget object
+ *
+ * This function is used only for WA2. For more information see Work around 2
+ * description.
+ */
+static void cdns3_wa2_descmissing_packet(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_request *priv_req;
+	struct usb_request *request;
+	u8 pending_empty = list_empty(&priv_ep->pending_req_list);
+
+	/* check for pending transfer */
+	if (!pending_empty) {
+		trace_cdns3_wa2(priv_ep, "Ignoring Descriptor missing IRQ\n");
+		return;
+	}
+
+	if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
+		priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
+		priv_ep->flags |= EP_QUIRK_EXTRA_BUF_EN;
+	}
+
+	trace_cdns3_wa2(priv_ep, "Description Missing detected\n");
+
+	if (priv_ep->wa2_counter >= CDNS3_WA2_NUM_BUFFERS) {
+		trace_cdns3_wa2(priv_ep, "WA2 overflow\n");
+		cdns3_wa2_remove_old_request(priv_ep);
+	}
+
+	request = cdns3_gadget_ep_alloc_request(&priv_ep->endpoint,
+						GFP_ATOMIC);
+	if (!request)
+		goto err;
+
+	priv_req = to_cdns3_request(request);
+	priv_req->flags |= REQUEST_INTERNAL;
+
+	/* if this field is still assigned it indicate that transfer related
+	 * with this request has not been finished yet. Driver in this
+	 * case simply allocate next request and assign flag REQUEST_INTERNAL_CH
+	 * flag to previous one. It will indicate that current request is
+	 * part of the previous one.
+	 */
+	if (priv_ep->descmis_req)
+		priv_ep->descmis_req->flags |= REQUEST_INTERNAL_CH;
+
+	priv_req->request.buf = kzalloc(CDNS3_DESCMIS_BUF_SIZE,
+					GFP_ATOMIC);
+	priv_ep->wa2_counter++;
+
+	if (!priv_req->request.buf) {
+		cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
+		goto err;
+	}
+
+	priv_req->request.length = CDNS3_DESCMIS_BUF_SIZE;
+	priv_ep->descmis_req = priv_req;
+
+	__cdns3_gadget_ep_queue(&priv_ep->endpoint,
+				&priv_ep->descmis_req->request,
+				GFP_ATOMIC);
+
+	return;
+
+err:
+	dev_err(priv_ep->cdns3_dev->dev,
+		"Failed: No sufficient memory for DESCMIS\n");
+}
+
+static void cdns3_wa2_reset_tdl(struct cdns3_device *priv_dev)
+{
+	u16 tdl = EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd));
+
+	if (tdl) {
+		u16 reset_val = EP_CMD_TDL_MAX + 1 - tdl;
+
+		writel(EP_CMD_TDL_SET(reset_val) | EP_CMD_STDL,
+		       &priv_dev->regs->ep_cmd);
+	}
+}
+
+static void cdns3_wa2_check_outq_status(struct cdns3_device *priv_dev)
+{
+	u32 ep_sts_reg;
+
+	/* select EP0-out */
+	cdns3_select_ep(priv_dev, 0);
+
+	ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+
+	if (EP_STS_OUTQ_VAL(ep_sts_reg)) {
+		u32 outq_ep_num = EP_STS_OUTQ_NO(ep_sts_reg);
+		struct cdns3_endpoint *outq_ep = priv_dev->eps[outq_ep_num];
+
+		if ((outq_ep->flags & EP_ENABLED) && !(outq_ep->use_streams) &&
+		    outq_ep->type != USB_ENDPOINT_XFER_ISOC && outq_ep_num) {
+			u8 pending_empty = list_empty(&outq_ep->pending_req_list);
+
+			if ((outq_ep->flags & EP_QUIRK_EXTRA_BUF_DET) ||
+			    (outq_ep->flags & EP_QUIRK_EXTRA_BUF_EN) ||
+			    !pending_empty) {
+			} else {
+				u32 ep_sts_en_reg;
+				u32 ep_cmd_reg;
+
+				cdns3_select_ep(priv_dev, outq_ep->num |
+						outq_ep->dir);
+				ep_sts_en_reg = readl(&priv_dev->regs->ep_sts_en);
+				ep_cmd_reg = readl(&priv_dev->regs->ep_cmd);
+
+				outq_ep->flags |= EP_TDLCHK_EN;
+				cdns3_set_register_bit(&priv_dev->regs->ep_cfg,
+						       EP_CFG_TDL_CHK);
+
+				cdns3_wa2_enable_detection(priv_dev, outq_ep,
+							   ep_sts_en_reg);
+				writel(ep_sts_en_reg,
+				       &priv_dev->regs->ep_sts_en);
+				/* reset tdl value to zero */
+				cdns3_wa2_reset_tdl(priv_dev);
+				/*
+				 * Memory barrier - Reset tdl before ringing the
+				 * doorbell.
+				 */
+				wmb();
+				if (EP_CMD_DRDY & ep_cmd_reg) {
+					trace_cdns3_wa2(outq_ep, "Enabling WA2 skipping doorbell\n");
+
+				} else {
+					trace_cdns3_wa2(outq_ep, "Enabling WA2 ringing doorbell\n");
+					/*
+					 * ring doorbell to generate DESCMIS irq
+					 */
+					writel(EP_CMD_DRDY,
+					       &priv_dev->regs->ep_cmd);
+				}
+			}
+		}
+	}
+}
+
+/**
+ * cdns3_gadget_giveback - call struct usb_request's ->complete callback
+ * @priv_ep: The endpoint to whom the request belongs to
+ * @priv_req: The request we're giving back
+ * @status: completion code for the request
+ *
+ * Must be called with controller's lock held and interrupts disabled. This
+ * function will unmap @req and call its ->complete() callback to notify upper
+ * layers that it has completed.
+ */
+void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
+			   struct cdns3_request *priv_req,
+			   int status)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct usb_request *request = &priv_req->request;
+
+	list_del_init(&request->list);
+
+	if (request->status == -EINPROGRESS)
+		request->status = status;
+
+	if (likely(!(priv_req->flags & REQUEST_UNALIGNED)))
+		usb_gadget_unmap_request_by_dev(priv_dev->sysdev, request,
+					priv_ep->dir);
+
+	if ((priv_req->flags & REQUEST_UNALIGNED) &&
+	    priv_ep->dir == USB_DIR_OUT && !request->status) {
+		/* Make DMA buffer CPU accessible */
+		dma_sync_single_for_cpu(priv_dev->sysdev,
+			priv_req->aligned_buf->dma,
+			request->actual,
+			priv_req->aligned_buf->dir);
+		memcpy(request->buf, priv_req->aligned_buf->buf,
+		       request->actual);
+	}
+
+	priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED);
+	/* All TRBs have finished, clear the counter */
+	priv_req->finished_trb = 0;
+	trace_cdns3_gadget_giveback(priv_req);
+
+	if (priv_dev->dev_ver < DEV_VER_V2) {
+		request = cdns3_wa2_gadget_giveback(priv_dev, priv_ep,
+						    priv_req);
+		if (!request)
+			return;
+	}
+
+	if (request->complete) {
+		spin_unlock(&priv_dev->lock);
+		usb_gadget_giveback_request(&priv_ep->endpoint,
+					    request);
+		spin_lock(&priv_dev->lock);
+	}
+
+	if (request->buf == priv_dev->zlp_buf)
+		cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
+}
+
+static void cdns3_wa1_restore_cycle_bit(struct cdns3_endpoint *priv_ep)
+{
+	/* Work around for stale data address in TRB*/
+	if (priv_ep->wa1_set) {
+		trace_cdns3_wa1(priv_ep, "restore cycle bit");
+
+		priv_ep->wa1_set = 0;
+		priv_ep->wa1_trb_index = 0xFFFF;
+		if (priv_ep->wa1_cycle_bit) {
+			priv_ep->wa1_trb->control =
+				priv_ep->wa1_trb->control | cpu_to_le32(0x1);
+		} else {
+			priv_ep->wa1_trb->control =
+				priv_ep->wa1_trb->control & cpu_to_le32(~0x1);
+		}
+	}
+}
+
+static void cdns3_free_aligned_request_buf(struct work_struct *work)
+{
+	struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
+					aligned_buf_wq);
+	struct cdns3_aligned_buf *buf, *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	list_for_each_entry_safe(buf, tmp, &priv_dev->aligned_buf_list, list) {
+		if (!buf->in_use) {
+			list_del(&buf->list);
+
+			/*
+			 * Re-enable interrupts to free DMA capable memory.
+			 * Driver can't free this memory with disabled
+			 * interrupts.
+			 */
+			spin_unlock_irqrestore(&priv_dev->lock, flags);
+			dma_free_noncoherent(priv_dev->sysdev, buf->size,
+					  buf->buf, buf->dma, buf->dir);
+			kfree(buf);
+			spin_lock_irqsave(&priv_dev->lock, flags);
+		}
+	}
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+}
+
+static int cdns3_prepare_aligned_request_buf(struct cdns3_request *priv_req)
+{
+	struct cdns3_endpoint *priv_ep = priv_req->priv_ep;
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct cdns3_aligned_buf *buf;
+
+	/* check if buffer is aligned to 8. */
+	if (!((uintptr_t)priv_req->request.buf & 0x7))
+		return 0;
+
+	buf = priv_req->aligned_buf;
+
+	if (!buf || priv_req->request.length > buf->size) {
+		buf = kzalloc(sizeof(*buf), GFP_ATOMIC);
+		if (!buf)
+			return -ENOMEM;
+
+		buf->size = priv_req->request.length;
+		buf->dir = usb_endpoint_dir_in(priv_ep->endpoint.desc) ?
+			DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+		buf->buf = dma_alloc_noncoherent(priv_dev->sysdev,
+					      buf->size,
+					      &buf->dma,
+					      buf->dir,
+					      GFP_ATOMIC);
+		if (!buf->buf) {
+			kfree(buf);
+			return -ENOMEM;
+		}
+
+		if (priv_req->aligned_buf) {
+			trace_cdns3_free_aligned_request(priv_req);
+			priv_req->aligned_buf->in_use = 0;
+			queue_work(system_freezable_wq,
+				   &priv_dev->aligned_buf_wq);
+		}
+
+		buf->in_use = 1;
+		priv_req->aligned_buf = buf;
+
+		list_add_tail(&buf->list,
+			      &priv_dev->aligned_buf_list);
+	}
+
+	if (priv_ep->dir == USB_DIR_IN) {
+		/* Make DMA buffer CPU accessible */
+		dma_sync_single_for_cpu(priv_dev->sysdev,
+			buf->dma, buf->size, buf->dir);
+		memcpy(buf->buf, priv_req->request.buf,
+		       priv_req->request.length);
+	}
+
+	/* Transfer DMA buffer ownership back to device */
+	dma_sync_single_for_device(priv_dev->sysdev,
+			buf->dma, buf->size, buf->dir);
+
+	priv_req->flags |= REQUEST_UNALIGNED;
+	trace_cdns3_prepare_aligned_request(priv_req);
+
+	return 0;
+}
+
+static int cdns3_wa1_update_guard(struct cdns3_endpoint *priv_ep,
+				  struct cdns3_trb *trb)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	if (!priv_ep->wa1_set) {
+		u32 doorbell;
+
+		doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+
+		if (doorbell) {
+			priv_ep->wa1_cycle_bit = priv_ep->pcs ? TRB_CYCLE : 0;
+			priv_ep->wa1_set = 1;
+			priv_ep->wa1_trb = trb;
+			priv_ep->wa1_trb_index = priv_ep->enqueue;
+			trace_cdns3_wa1(priv_ep, "set guard");
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static void cdns3_wa1_tray_restore_cycle_bit(struct cdns3_device *priv_dev,
+					     struct cdns3_endpoint *priv_ep)
+{
+	int dma_index;
+	u32 doorbell;
+
+	doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+	dma_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+
+	if (!doorbell || dma_index != priv_ep->wa1_trb_index)
+		cdns3_wa1_restore_cycle_bit(priv_ep);
+}
+
+static int cdns3_ep_run_stream_transfer(struct cdns3_endpoint *priv_ep,
+					struct usb_request *request)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct cdns3_request *priv_req;
+	struct cdns3_trb *trb;
+	dma_addr_t trb_dma;
+	int address;
+	u32 control;
+	u32 length;
+	u32 tdl;
+	unsigned int sg_idx = priv_ep->stream_sg_idx;
+
+	priv_req = to_cdns3_request(request);
+	address = priv_ep->endpoint.desc->bEndpointAddress;
+
+	priv_ep->flags |= EP_PENDING_REQUEST;
+
+	/* must allocate buffer aligned to 8 */
+	if (priv_req->flags & REQUEST_UNALIGNED)
+		trb_dma = priv_req->aligned_buf->dma;
+	else
+		trb_dma = request->dma;
+
+	/*  For stream capable endpoints driver use only single TD. */
+	trb = priv_ep->trb_pool + priv_ep->enqueue;
+	priv_req->start_trb = priv_ep->enqueue;
+	priv_req->end_trb = priv_req->start_trb;
+	priv_req->trb = trb;
+
+	cdns3_select_ep(priv_ep->cdns3_dev, address);
+
+	control = TRB_TYPE(TRB_NORMAL) | TRB_CYCLE |
+		  TRB_STREAM_ID(priv_req->request.stream_id) | TRB_ISP;
+
+	if (!request->num_sgs) {
+		trb->buffer = cpu_to_le32(TRB_BUFFER(trb_dma));
+		length = request->length;
+	} else {
+		trb->buffer = cpu_to_le32(TRB_BUFFER(request->sg[sg_idx].dma_address));
+		length = request->sg[sg_idx].length;
+	}
+
+	tdl = DIV_ROUND_UP(length, priv_ep->endpoint.maxpacket);
+
+	trb->length = cpu_to_le32(TRB_BURST_LEN(16) | TRB_LEN(length));
+
+	/*
+	 * For DEV_VER_V2 controller version we have enabled
+	 * USB_CONF2_EN_TDL_TRB in DMULT configuration.
+	 * This enables TDL calculation based on TRB, hence setting TDL in TRB.
+	 */
+	if (priv_dev->dev_ver >= DEV_VER_V2) {
+		if (priv_dev->gadget.speed == USB_SPEED_SUPER)
+			trb->length |= cpu_to_le32(TRB_TDL_SS_SIZE(tdl));
+	}
+	priv_req->flags |= REQUEST_PENDING;
+
+	trb->control = cpu_to_le32(control);
+
+	trace_cdns3_prepare_trb(priv_ep, priv_req->trb);
+
+	/*
+	 * Memory barrier - Cycle Bit must be set before trb->length  and
+	 * trb->buffer fields.
+	 */
+	wmb();
+
+	/* always first element */
+	writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma),
+	       &priv_dev->regs->ep_traddr);
+
+	if (!(priv_ep->flags & EP_STALLED)) {
+		trace_cdns3_ring(priv_ep);
+		/*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/
+		writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts);
+
+		priv_ep->prime_flag = false;
+
+		/*
+		 * Controller version DEV_VER_V2 tdl calculation
+		 * is based on TRB
+		 */
+
+		if (priv_dev->dev_ver < DEV_VER_V2)
+			writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL,
+			       &priv_dev->regs->ep_cmd);
+		else if (priv_dev->dev_ver > DEV_VER_V2)
+			writel(tdl, &priv_dev->regs->ep_tdl);
+
+		priv_ep->last_stream_id = priv_req->request.stream_id;
+		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+		writel(EP_CMD_ERDY_SID(priv_req->request.stream_id) |
+		       EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
+
+		trace_cdns3_doorbell_epx(priv_ep->name,
+					 readl(&priv_dev->regs->ep_traddr));
+	}
+
+	/* WORKAROUND for transition to L0 */
+	__cdns3_gadget_wakeup(priv_dev);
+
+	return 0;
+}
+
+static void cdns3_rearm_drdy_if_needed(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	if (priv_dev->dev_ver < DEV_VER_V3)
+		return;
+
+	if (readl(&priv_dev->regs->ep_sts) & EP_STS_TRBERR) {
+		writel(EP_STS_TRBERR, &priv_dev->regs->ep_sts);
+		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+	}
+}
+
+/**
+ * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware
+ * @priv_ep: endpoint object
+ * @request: request object
+ *
+ * Returns zero on success or negative value on failure
+ */
+static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
+				 struct usb_request *request)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct cdns3_request *priv_req;
+	struct cdns3_trb *trb;
+	struct cdns3_trb *link_trb = NULL;
+	dma_addr_t trb_dma;
+	u32 togle_pcs = 1;
+	int sg_iter = 0;
+	int num_trb_req;
+	int trb_burst;
+	int num_trb;
+	int address;
+	u32 control;
+	int pcs;
+	u16 total_tdl = 0;
+	struct scatterlist *s = NULL;
+	bool sg_supported = !!(request->num_mapped_sgs);
+
+	num_trb_req = sg_supported ? request->num_mapped_sgs : 1;
+
+	/* ISO transfer require each SOF have a TD, each TD include some TRBs */
+	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+		num_trb = priv_ep->interval * num_trb_req;
+	else
+		num_trb = num_trb_req;
+
+	priv_req = to_cdns3_request(request);
+	address = priv_ep->endpoint.desc->bEndpointAddress;
+
+	priv_ep->flags |= EP_PENDING_REQUEST;
+
+	/* must allocate buffer aligned to 8 */
+	if (priv_req->flags & REQUEST_UNALIGNED)
+		trb_dma = priv_req->aligned_buf->dma;
+	else
+		trb_dma = request->dma;
+
+	trb = priv_ep->trb_pool + priv_ep->enqueue;
+	priv_req->start_trb = priv_ep->enqueue;
+	priv_req->trb = trb;
+
+	cdns3_select_ep(priv_ep->cdns3_dev, address);
+
+	/* prepare ring */
+	if ((priv_ep->enqueue + num_trb)  >= (priv_ep->num_trbs - 1)) {
+		int doorbell, dma_index;
+		u32 ch_bit = 0;
+
+		doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+		dma_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+
+		/* Driver can't update LINK TRB if it is current processed. */
+		if (doorbell && dma_index == priv_ep->num_trbs - 1) {
+			priv_ep->flags |= EP_DEFERRED_DRDY;
+			return -ENOBUFS;
+		}
+
+		/*updating C bt in  Link TRB before starting DMA*/
+		link_trb = priv_ep->trb_pool + (priv_ep->num_trbs - 1);
+		/*
+		 * For TRs size equal 2 enabling TRB_CHAIN for epXin causes
+		 * that DMA stuck at the LINK TRB.
+		 * On the other hand, removing TRB_CHAIN for longer TRs for
+		 * epXout cause that DMA stuck after handling LINK TRB.
+		 * To eliminate this strange behavioral driver set TRB_CHAIN
+		 * bit only for TR size > 2.
+		 */
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC ||
+		    TRBS_PER_SEGMENT > 2)
+			ch_bit = TRB_CHAIN;
+
+		link_trb->control = cpu_to_le32(((priv_ep->pcs) ? TRB_CYCLE : 0) |
+				    TRB_TYPE(TRB_LINK) | TRB_TOGGLE | ch_bit);
+
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+			/*
+			 * ISO require LINK TRB must be first one of TD.
+			 * Fill LINK TRBs for left trb space to simply software process logic.
+			 */
+			while (priv_ep->enqueue) {
+				*trb = *link_trb;
+				trace_cdns3_prepare_trb(priv_ep, trb);
+
+				cdns3_ep_inc_enq(priv_ep);
+				trb = priv_ep->trb_pool + priv_ep->enqueue;
+				priv_req->trb = trb;
+			}
+		}
+	}
+
+	if (num_trb > priv_ep->free_trbs) {
+		priv_ep->flags |= EP_RING_FULL;
+		return -ENOBUFS;
+	}
+
+	if (priv_dev->dev_ver <= DEV_VER_V2)
+		togle_pcs = cdns3_wa1_update_guard(priv_ep, trb);
+
+	/* set incorrect Cycle Bit for first trb*/
+	control = priv_ep->pcs ? 0 : TRB_CYCLE;
+	trb->length = 0;
+	if (priv_dev->dev_ver >= DEV_VER_V2) {
+		u16 td_size;
+
+		td_size = DIV_ROUND_UP(request->length,
+				       priv_ep->endpoint.maxpacket);
+		if (priv_dev->gadget.speed == USB_SPEED_SUPER)
+			trb->length = cpu_to_le32(TRB_TDL_SS_SIZE(td_size));
+		else
+			control |= TRB_TDL_HS_SIZE(td_size);
+	}
+
+	do {
+		u32 length;
+
+		if (!(sg_iter % num_trb_req) && sg_supported)
+			s = request->sg;
+
+		/* fill TRB */
+		control |= TRB_TYPE(TRB_NORMAL);
+		if (sg_supported) {
+			trb->buffer = cpu_to_le32(TRB_BUFFER(sg_dma_address(s)));
+			length = sg_dma_len(s);
+		} else {
+			trb->buffer = cpu_to_le32(TRB_BUFFER(trb_dma));
+			length = request->length;
+		}
+
+		if (priv_ep->flags & EP_TDLCHK_EN)
+			total_tdl += DIV_ROUND_UP(length,
+					       priv_ep->endpoint.maxpacket);
+
+		trb_burst = priv_ep->trb_burst_size;
+
+		/*
+		 * Supposed DMA cross 4k bounder problem should be fixed at DEV_VER_V2, but still
+		 * met problem when do ISO transfer if sg enabled.
+		 *
+		 * Data pattern likes below when sg enabled, package size is 1k and mult is 2
+		 *       [UVC Header(8B) ] [data(3k - 8)] ...
+		 *
+		 * The received data at offset 0xd000 will get 0xc000 data, len 0x70. Error happen
+		 * as below pattern:
+		 *	0xd000: wrong
+		 *	0xe000: wrong
+		 *	0xf000: correct
+		 *	0x10000: wrong
+		 *	0x11000: wrong
+		 *	0x12000: correct
+		 *	...
+		 *
+		 * But it is still unclear about why error have not happen below 0xd000, it should
+		 * cross 4k bounder. But anyway, the below code can fix this problem.
+		 *
+		 * To avoid DMA cross 4k bounder at ISO transfer, reduce burst len according to 16.
+		 */
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_dev->dev_ver <= DEV_VER_V2)
+			if (ALIGN_DOWN(trb->buffer, SZ_4K) !=
+			    ALIGN_DOWN(trb->buffer + length, SZ_4K))
+				trb_burst = 16;
+
+		trb->length |= cpu_to_le32(TRB_BURST_LEN(trb_burst) |
+					TRB_LEN(length));
+		pcs = priv_ep->pcs ? TRB_CYCLE : 0;
+
+		/*
+		 * first trb should be prepared as last to avoid processing
+		 *  transfer to early
+		 */
+		if (sg_iter != 0)
+			control |= pcs;
+
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
+			control |= TRB_IOC | TRB_ISP;
+		} else {
+			/* for last element in TD or in SG list */
+			if (sg_iter == (num_trb - 1) && sg_iter != 0)
+				control |= pcs | TRB_IOC | TRB_ISP;
+		}
+
+		if (sg_iter)
+			trb->control = cpu_to_le32(control);
+		else
+			priv_req->trb->control = cpu_to_le32(control);
+
+		if (sg_supported) {
+			trb->control |= cpu_to_le32(TRB_ISP);
+			/* Don't set chain bit for last TRB */
+			if ((sg_iter % num_trb_req) < num_trb_req - 1)
+				trb->control |= cpu_to_le32(TRB_CHAIN);
+
+			s = sg_next(s);
+		}
+
+		control = 0;
+		++sg_iter;
+		priv_req->end_trb = priv_ep->enqueue;
+		cdns3_ep_inc_enq(priv_ep);
+		trb = priv_ep->trb_pool + priv_ep->enqueue;
+		trb->length = 0;
+	} while (sg_iter < num_trb);
+
+	trb = priv_req->trb;
+
+	priv_req->flags |= REQUEST_PENDING;
+	priv_req->num_of_trb = num_trb;
+
+	if (sg_iter == 1)
+		trb->control |= cpu_to_le32(TRB_IOC | TRB_ISP);
+
+	if (priv_dev->dev_ver < DEV_VER_V2 &&
+	    (priv_ep->flags & EP_TDLCHK_EN)) {
+		u16 tdl = total_tdl;
+		u16 old_tdl = EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd));
+
+		if (tdl > EP_CMD_TDL_MAX) {
+			tdl = EP_CMD_TDL_MAX;
+			priv_ep->pending_tdl = total_tdl - EP_CMD_TDL_MAX;
+		}
+
+		if (old_tdl < tdl) {
+			tdl -= old_tdl;
+			writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL,
+			       &priv_dev->regs->ep_cmd);
+		}
+	}
+
+	/*
+	 * Memory barrier - cycle bit must be set before other filds in trb.
+	 */
+	wmb();
+
+	/* give the TD to the consumer*/
+	if (togle_pcs)
+		trb->control = trb->control ^ cpu_to_le32(1);
+
+	if (priv_dev->dev_ver <= DEV_VER_V2)
+		cdns3_wa1_tray_restore_cycle_bit(priv_dev, priv_ep);
+
+	if (num_trb > 1) {
+		int i = 0;
+
+		while (i < num_trb) {
+			trace_cdns3_prepare_trb(priv_ep, trb + i);
+			if (trb + i == link_trb) {
+				trb = priv_ep->trb_pool;
+				num_trb = num_trb - i;
+				i = 0;
+			} else {
+				i++;
+			}
+		}
+	} else {
+		trace_cdns3_prepare_trb(priv_ep, priv_req->trb);
+	}
+
+	/*
+	 * Memory barrier - Cycle Bit must be set before trb->length  and
+	 * trb->buffer fields.
+	 */
+	wmb();
+
+	/*
+	 * For DMULT mode we can set address to transfer ring only once after
+	 * enabling endpoint.
+	 */
+	if (priv_ep->flags & EP_UPDATE_EP_TRBADDR) {
+		/*
+		 * Until SW is not ready to handle the OUT transfer the ISO OUT
+		 * Endpoint should be disabled (EP_CFG.ENABLE = 0).
+		 * EP_CFG_ENABLE must be set before updating ep_traddr.
+		 */
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir &&
+		    !(priv_ep->flags & EP_QUIRK_ISO_OUT_EN)) {
+			priv_ep->flags |= EP_QUIRK_ISO_OUT_EN;
+			cdns3_set_register_bit(&priv_dev->regs->ep_cfg,
+					       EP_CFG_ENABLE);
+		}
+
+		writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma +
+					priv_req->start_trb * TRB_SIZE),
+					&priv_dev->regs->ep_traddr);
+
+		priv_ep->flags &= ~EP_UPDATE_EP_TRBADDR;
+	}
+
+	if (!priv_ep->wa1_set && !(priv_ep->flags & EP_STALLED)) {
+		trace_cdns3_ring(priv_ep);
+		/*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/
+		writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts);
+		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+		cdns3_rearm_drdy_if_needed(priv_ep);
+		trace_cdns3_doorbell_epx(priv_ep->name,
+					 readl(&priv_dev->regs->ep_traddr));
+	}
+
+	/* WORKAROUND for transition to L0 */
+	__cdns3_gadget_wakeup(priv_dev);
+
+	return 0;
+}
+
+void cdns3_set_hw_configuration(struct cdns3_device *priv_dev)
+{
+	struct cdns3_endpoint *priv_ep;
+	struct usb_ep *ep;
+
+	if (priv_dev->hw_configured_flag)
+		return;
+
+	writel(USB_CONF_CFGSET, &priv_dev->regs->usb_conf);
+
+	cdns3_set_register_bit(&priv_dev->regs->usb_conf,
+			       USB_CONF_U1EN | USB_CONF_U2EN);
+
+	priv_dev->hw_configured_flag = 1;
+
+	list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+		if (ep->enabled) {
+			priv_ep = ep_to_cdns3_ep(ep);
+			cdns3_start_all_request(priv_dev, priv_ep);
+		}
+	}
+
+	cdns3_allow_enable_l1(priv_dev, 1);
+}
+
+/**
+ * cdns3_trb_handled - check whether trb has been handled by DMA
+ *
+ * @priv_ep: extended endpoint object.
+ * @priv_req: request object for checking
+ *
+ * Endpoint must be selected before invoking this function.
+ *
+ * Returns false if request has not been handled by DMA, else returns true.
+ *
+ * SR - start ring
+ * ER -  end ring
+ * DQ = priv_ep->dequeue - dequeue position
+ * EQ = priv_ep->enqueue -  enqueue position
+ * ST = priv_req->start_trb - index of first TRB in transfer ring
+ * ET = priv_req->end_trb - index of last TRB in transfer ring
+ * CI = current_index - index of processed TRB by DMA.
+ *
+ * As first step, we check if the TRB between the ST and ET.
+ * Then, we check if cycle bit for index priv_ep->dequeue
+ * is correct.
+ *
+ * some rules:
+ * 1. priv_ep->dequeue never equals to current_index.
+ * 2  priv_ep->enqueue never exceed priv_ep->dequeue
+ * 3. exception: priv_ep->enqueue == priv_ep->dequeue
+ *    and priv_ep->free_trbs is zero.
+ *    This case indicate that TR is full.
+ *
+ * At below two cases, the request have been handled.
+ * Case 1 - priv_ep->dequeue < current_index
+ *      SR ... EQ ... DQ ... CI ... ER
+ *      SR ... DQ ... CI ... EQ ... ER
+ *
+ * Case 2 - priv_ep->dequeue > current_index
+ * This situation takes place when CI go through the LINK TRB at the end of
+ * transfer ring.
+ *      SR ... CI ... EQ ... DQ ... ER
+ */
+static bool cdns3_trb_handled(struct cdns3_endpoint *priv_ep,
+				  struct cdns3_request *priv_req)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct cdns3_trb *trb;
+	int current_index = 0;
+	int handled = 0;
+	int doorbell;
+
+	current_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+	doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+
+	/* current trb doesn't belong to this request */
+	if (priv_req->start_trb < priv_req->end_trb) {
+		if (priv_ep->dequeue > priv_req->end_trb)
+			goto finish;
+
+		if (priv_ep->dequeue < priv_req->start_trb)
+			goto finish;
+	}
+
+	if ((priv_req->start_trb > priv_req->end_trb) &&
+		(priv_ep->dequeue > priv_req->end_trb) &&
+		(priv_ep->dequeue < priv_req->start_trb))
+		goto finish;
+
+	if ((priv_req->start_trb == priv_req->end_trb) &&
+		(priv_ep->dequeue != priv_req->end_trb))
+		goto finish;
+
+	trb = &priv_ep->trb_pool[priv_ep->dequeue];
+
+	if ((le32_to_cpu(trb->control) & TRB_CYCLE) != priv_ep->ccs)
+		goto finish;
+
+	if (doorbell == 1 && current_index == priv_ep->dequeue)
+		goto finish;
+
+	/* The corner case for TRBS_PER_SEGMENT equal 2). */
+	if (TRBS_PER_SEGMENT == 2 && priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+		handled = 1;
+		goto finish;
+	}
+
+	if (priv_ep->enqueue == priv_ep->dequeue &&
+	    priv_ep->free_trbs == 0) {
+		handled = 1;
+	} else if (priv_ep->dequeue < current_index) {
+		if ((current_index == (priv_ep->num_trbs - 1)) &&
+		    !priv_ep->dequeue)
+			goto finish;
+
+		handled = 1;
+	} else if (priv_ep->dequeue  > current_index) {
+			handled = 1;
+	}
+
+finish:
+	trace_cdns3_request_handled(priv_req, current_index, handled);
+
+	return handled;
+}
+
+static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
+				     struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_request *priv_req;
+	struct usb_request *request;
+	struct cdns3_trb *trb;
+	bool request_handled = false;
+	bool transfer_end = false;
+
+	while (!list_empty(&priv_ep->pending_req_list)) {
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+		priv_req = to_cdns3_request(request);
+
+		trb = priv_ep->trb_pool + priv_ep->dequeue;
+
+		/* The TRB was changed as link TRB, and the request was handled at ep_dequeue */
+		while (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
+
+			/* ISO ep_traddr may stop at LINK TRB */
+			if (priv_ep->dequeue == cdns3_get_dma_pos(priv_dev, priv_ep) &&
+			    priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				break;
+
+			trace_cdns3_complete_trb(priv_ep, trb);
+			cdns3_ep_inc_deq(priv_ep);
+			trb = priv_ep->trb_pool + priv_ep->dequeue;
+		}
+
+		if (!request->stream_id) {
+			/* Re-select endpoint. It could be changed by other CPU
+			 * during handling usb_gadget_giveback_request.
+			 */
+			cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
+
+			while (cdns3_trb_handled(priv_ep, priv_req)) {
+				priv_req->finished_trb++;
+				if (priv_req->finished_trb >= priv_req->num_of_trb)
+					request_handled = true;
+
+				trb = priv_ep->trb_pool + priv_ep->dequeue;
+				trace_cdns3_complete_trb(priv_ep, trb);
+
+				if (!transfer_end)
+					request->actual +=
+						TRB_LEN(le32_to_cpu(trb->length));
+
+				if (priv_req->num_of_trb > 1 &&
+					le32_to_cpu(trb->control) & TRB_SMM &&
+					le32_to_cpu(trb->control) & TRB_CHAIN)
+					transfer_end = true;
+
+				cdns3_ep_inc_deq(priv_ep);
+			}
+
+			if (request_handled) {
+				/* TRBs are duplicated by priv_ep->interval time for ISO IN */
+				if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_ep->dir)
+					request->actual /= priv_ep->interval;
+
+				cdns3_gadget_giveback(priv_ep, priv_req, 0);
+				request_handled = false;
+				transfer_end = false;
+			} else {
+				goto prepare_next_td;
+			}
+
+			if (priv_ep->type != USB_ENDPOINT_XFER_ISOC &&
+			    TRBS_PER_SEGMENT == 2)
+				break;
+		} else {
+			/* Re-select endpoint. It could be changed by other CPU
+			 * during handling usb_gadget_giveback_request.
+			 */
+			cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
+
+			trb = priv_ep->trb_pool;
+			trace_cdns3_complete_trb(priv_ep, trb);
+
+			if (trb != priv_req->trb)
+				dev_warn(priv_dev->dev,
+					 "request_trb=0x%p, queue_trb=0x%p\n",
+					 priv_req->trb, trb);
+
+			request->actual += TRB_LEN(le32_to_cpu(trb->length));
+
+			if (!request->num_sgs ||
+			    (request->num_sgs == (priv_ep->stream_sg_idx + 1))) {
+				priv_ep->stream_sg_idx = 0;
+				cdns3_gadget_giveback(priv_ep, priv_req, 0);
+			} else {
+				priv_ep->stream_sg_idx++;
+				cdns3_ep_run_stream_transfer(priv_ep, request);
+			}
+			break;
+		}
+	}
+	priv_ep->flags &= ~EP_PENDING_REQUEST;
+
+prepare_next_td:
+	if (!(priv_ep->flags & EP_STALLED) &&
+	    !(priv_ep->flags & EP_STALL_PENDING))
+		cdns3_start_all_request(priv_dev, priv_ep);
+}
+
+void cdns3_rearm_transfer(struct cdns3_endpoint *priv_ep, u8 rearm)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	cdns3_wa1_restore_cycle_bit(priv_ep);
+
+	if (rearm) {
+		trace_cdns3_ring(priv_ep);
+
+		/* Cycle Bit must be updated before arming DMA. */
+		wmb();
+		writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+
+		__cdns3_gadget_wakeup(priv_dev);
+
+		trace_cdns3_doorbell_epx(priv_ep->name,
+					 readl(&priv_dev->regs->ep_traddr));
+	}
+}
+
+static void cdns3_reprogram_tdl(struct cdns3_endpoint *priv_ep)
+{
+	u16 tdl = priv_ep->pending_tdl;
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	if (tdl > EP_CMD_TDL_MAX) {
+		tdl = EP_CMD_TDL_MAX;
+		priv_ep->pending_tdl -= EP_CMD_TDL_MAX;
+	} else {
+		priv_ep->pending_tdl = 0;
+	}
+
+	writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL, &priv_dev->regs->ep_cmd);
+}
+
+/**
+ * cdns3_check_ep_interrupt_proceed - Processes interrupt related to endpoint
+ * @priv_ep: endpoint object
+ *
+ * Returns 0
+ */
+static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	u32 ep_sts_reg;
+	struct usb_request *deferred_request;
+	struct usb_request *pending_request;
+	u32 tdl = 0;
+
+	cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
+
+	trace_cdns3_epx_irq(priv_dev, priv_ep);
+
+	ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+	writel(ep_sts_reg, &priv_dev->regs->ep_sts);
+
+	if ((ep_sts_reg & EP_STS_PRIME) && priv_ep->use_streams) {
+		bool dbusy = !!(ep_sts_reg & EP_STS_DBUSY);
+
+		tdl = cdns3_get_tdl(priv_dev);
+
+		/*
+		 * Continue the previous transfer:
+		 * There is some racing between ERDY and PRIME. The device send
+		 * ERDY and almost in the same time Host send PRIME. It cause
+		 * that host ignore the ERDY packet and driver has to send it
+		 * again.
+		 */
+		if (tdl && (dbusy || !EP_STS_BUFFEMPTY(ep_sts_reg) ||
+		    EP_STS_HOSTPP(ep_sts_reg))) {
+			writel(EP_CMD_ERDY |
+			       EP_CMD_ERDY_SID(priv_ep->last_stream_id),
+			       &priv_dev->regs->ep_cmd);
+			ep_sts_reg &= ~(EP_STS_MD_EXIT | EP_STS_IOC);
+		} else {
+			priv_ep->prime_flag = true;
+
+			pending_request = cdns3_next_request(&priv_ep->pending_req_list);
+			deferred_request = cdns3_next_request(&priv_ep->deferred_req_list);
+
+			if (deferred_request && !pending_request) {
+				cdns3_start_all_request(priv_dev, priv_ep);
+			}
+		}
+	}
+
+	if (ep_sts_reg & EP_STS_TRBERR) {
+		if (priv_ep->flags & EP_STALL_PENDING &&
+		    !(ep_sts_reg & EP_STS_DESCMIS &&
+		    priv_dev->dev_ver < DEV_VER_V2)) {
+			cdns3_ep_stall_flush(priv_ep);
+		}
+
+		/*
+		 * For isochronous transfer driver completes request on
+		 * IOC or on TRBERR. IOC appears only when device receive
+		 * OUT data packet. If host disable stream or lost some packet
+		 * then the only way to finish all queued transfer is to do it
+		 * on TRBERR event.
+		 */
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC &&
+		    !priv_ep->wa1_set) {
+			if (!priv_ep->dir) {
+				u32 ep_cfg = readl(&priv_dev->regs->ep_cfg);
+
+				ep_cfg &= ~EP_CFG_ENABLE;
+				writel(ep_cfg, &priv_dev->regs->ep_cfg);
+				priv_ep->flags &= ~EP_QUIRK_ISO_OUT_EN;
+				priv_ep->flags |= EP_UPDATE_EP_TRBADDR;
+			}
+			cdns3_transfer_completed(priv_dev, priv_ep);
+		} else if (!(priv_ep->flags & EP_STALLED) &&
+			  !(priv_ep->flags & EP_STALL_PENDING)) {
+			if (priv_ep->flags & EP_DEFERRED_DRDY) {
+				priv_ep->flags &= ~EP_DEFERRED_DRDY;
+				cdns3_start_all_request(priv_dev, priv_ep);
+			} else {
+				cdns3_rearm_transfer(priv_ep,
+						     priv_ep->wa1_set);
+			}
+		}
+	}
+
+	if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP) ||
+	    (ep_sts_reg & EP_STS_IOT)) {
+		if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
+			if (ep_sts_reg & EP_STS_ISP)
+				priv_ep->flags |= EP_QUIRK_END_TRANSFER;
+			else
+				priv_ep->flags &= ~EP_QUIRK_END_TRANSFER;
+		}
+
+		if (!priv_ep->use_streams) {
+			if ((ep_sts_reg & EP_STS_IOC) ||
+			    (ep_sts_reg & EP_STS_ISP)) {
+				cdns3_transfer_completed(priv_dev, priv_ep);
+			} else if ((priv_ep->flags & EP_TDLCHK_EN) &
+				   priv_ep->pending_tdl) {
+				/* handle IOT with pending tdl */
+				cdns3_reprogram_tdl(priv_ep);
+			}
+		} else if (priv_ep->dir == USB_DIR_OUT) {
+			priv_ep->ep_sts_pending |= ep_sts_reg;
+		} else if (ep_sts_reg & EP_STS_IOT) {
+			cdns3_transfer_completed(priv_dev, priv_ep);
+		}
+	}
+
+	/*
+	 * MD_EXIT interrupt sets when stream capable endpoint exits
+	 * from MOVE DATA state of Bulk IN/OUT stream protocol state machine
+	 */
+	if (priv_ep->dir == USB_DIR_OUT && (ep_sts_reg & EP_STS_MD_EXIT) &&
+	    (priv_ep->ep_sts_pending & EP_STS_IOT) && priv_ep->use_streams) {
+		priv_ep->ep_sts_pending = 0;
+		cdns3_transfer_completed(priv_dev, priv_ep);
+	}
+
+	/*
+	 * WA2: this condition should only be meet when
+	 * priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET or
+	 * priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN.
+	 * In other cases this interrupt will be disabled.
+	 */
+	if (ep_sts_reg & EP_STS_DESCMIS && priv_dev->dev_ver < DEV_VER_V2 &&
+	    !(priv_ep->flags & EP_STALLED))
+		cdns3_wa2_descmissing_packet(priv_ep);
+
+	return 0;
+}
+
+static void cdns3_disconnect_gadget(struct cdns3_device *priv_dev)
+{
+	if (priv_dev->gadget_driver && priv_dev->gadget_driver->disconnect)
+		priv_dev->gadget_driver->disconnect(&priv_dev->gadget);
+}
+
+/**
+ * cdns3_check_usb_interrupt_proceed - Processes interrupt related to device
+ * @priv_dev: extended gadget object
+ * @usb_ists: bitmap representation of device's reported interrupts
+ * (usb_ists register value)
+ */
+static void cdns3_check_usb_interrupt_proceed(struct cdns3_device *priv_dev,
+					      u32 usb_ists)
+__must_hold(&priv_dev->lock)
+{
+	int speed = 0;
+
+	trace_cdns3_usb_irq(priv_dev, usb_ists);
+	if (usb_ists & USB_ISTS_L1ENTI) {
+		/*
+		 * WORKAROUND: CDNS3 controller has issue with hardware resuming
+		 * from L1. To fix it, if any DMA transfer is pending driver
+		 * must starts driving resume signal immediately.
+		 */
+		if (readl(&priv_dev->regs->drbl))
+			__cdns3_gadget_wakeup(priv_dev);
+	}
+
+	/* Connection detected */
+	if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) {
+		speed = cdns3_get_speed(priv_dev);
+		priv_dev->gadget.speed = speed;
+		usb_gadget_set_state(&priv_dev->gadget, USB_STATE_POWERED);
+		cdns3_ep0_config(priv_dev);
+	}
+
+	/* Disconnection detected */
+	if (usb_ists & (USB_ISTS_DIS2I | USB_ISTS_DISI)) {
+		spin_unlock(&priv_dev->lock);
+		cdns3_disconnect_gadget(priv_dev);
+		spin_lock(&priv_dev->lock);
+		priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+		usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);
+		cdns3_hw_reset_eps_config(priv_dev);
+	}
+
+	if (usb_ists & (USB_ISTS_L2ENTI | USB_ISTS_U3ENTI)) {
+		if (priv_dev->gadget_driver &&
+		    priv_dev->gadget_driver->suspend) {
+			spin_unlock(&priv_dev->lock);
+			priv_dev->gadget_driver->suspend(&priv_dev->gadget);
+			spin_lock(&priv_dev->lock);
+		}
+	}
+
+	if (usb_ists & (USB_ISTS_L2EXTI | USB_ISTS_U3EXTI)) {
+		if (priv_dev->gadget_driver &&
+		    priv_dev->gadget_driver->resume) {
+			spin_unlock(&priv_dev->lock);
+			priv_dev->gadget_driver->resume(&priv_dev->gadget);
+			spin_lock(&priv_dev->lock);
+		}
+	}
+
+	/* reset*/
+	if (usb_ists & (USB_ISTS_UWRESI | USB_ISTS_UHRESI | USB_ISTS_U2RESI)) {
+		if (priv_dev->gadget_driver) {
+			spin_unlock(&priv_dev->lock);
+			usb_gadget_udc_reset(&priv_dev->gadget,
+					     priv_dev->gadget_driver);
+			spin_lock(&priv_dev->lock);
+
+			/*read again to check the actual speed*/
+			speed = cdns3_get_speed(priv_dev);
+			priv_dev->gadget.speed = speed;
+			cdns3_hw_reset_eps_config(priv_dev);
+			cdns3_ep0_config(priv_dev);
+		}
+	}
+}
+
+/**
+ * cdns3_device_irq_handler - interrupt handler for device part of controller
+ *
+ * @irq: irq number for cdns3 core device
+ * @data: structure of cdns3
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns3_device_irq_handler(int irq, void *data)
+{
+	struct cdns3_device *priv_dev = data;
+	struct cdns *cdns = dev_get_drvdata(priv_dev->dev);
+	irqreturn_t ret = IRQ_NONE;
+	u32 reg;
+
+	if (cdns->in_lpm)
+		return ret;
+
+	/* check USB device interrupt */
+	reg = readl(&priv_dev->regs->usb_ists);
+	if (reg) {
+		/* After masking interrupts the new interrupts won't be
+		 * reported in usb_ists/ep_ists. In order to not lose some
+		 * of them driver disables only detected interrupts.
+		 * They will be enabled ASAP after clearing source of
+		 * interrupt. This an unusual behavior only applies to
+		 * usb_ists register.
+		 */
+		reg = ~reg & readl(&priv_dev->regs->usb_ien);
+		/* mask deferred interrupt. */
+		writel(reg, &priv_dev->regs->usb_ien);
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	/* check endpoint interrupt */
+	reg = readl(&priv_dev->regs->ep_ists);
+	if (reg) {
+		writel(0, &priv_dev->regs->ep_ien);
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	return ret;
+}
+
+/**
+ * cdns3_device_thread_irq_handler - interrupt handler for device part
+ * of controller
+ *
+ * @irq: irq number for cdns3 core device
+ * @data: structure of cdns3
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns3_device_thread_irq_handler(int irq, void *data)
+{
+	struct cdns3_device *priv_dev = data;
+	irqreturn_t ret = IRQ_NONE;
+	unsigned long flags;
+	unsigned int bit;
+	unsigned long reg;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	reg = readl(&priv_dev->regs->usb_ists);
+	if (reg) {
+		writel(reg, &priv_dev->regs->usb_ists);
+		writel(USB_IEN_INIT, &priv_dev->regs->usb_ien);
+		cdns3_check_usb_interrupt_proceed(priv_dev, reg);
+		ret = IRQ_HANDLED;
+	}
+
+	reg = readl(&priv_dev->regs->ep_ists);
+
+	/* handle default endpoint OUT */
+	if (reg & EP_ISTS_EP_OUT0) {
+		cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_OUT);
+		ret = IRQ_HANDLED;
+	}
+
+	/* handle default endpoint IN */
+	if (reg & EP_ISTS_EP_IN0) {
+		cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_IN);
+		ret = IRQ_HANDLED;
+	}
+
+	/* check if interrupt from non default endpoint, if no exit */
+	reg &= ~(EP_ISTS_EP_OUT0 | EP_ISTS_EP_IN0);
+	if (!reg)
+		goto irqend;
+
+	for_each_set_bit(bit, &reg,
+			 sizeof(u32) * BITS_PER_BYTE) {
+		cdns3_check_ep_interrupt_proceed(priv_dev->eps[bit]);
+		ret = IRQ_HANDLED;
+	}
+
+	if (priv_dev->dev_ver < DEV_VER_V2 && priv_dev->using_streams)
+		cdns3_wa2_check_outq_status(priv_dev);
+
+irqend:
+	writel(~0, &priv_dev->regs->ep_ien);
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+	return ret;
+}
+
+/**
+ * cdns3_ep_onchip_buffer_reserve - Try to reserve onchip buf for EP
+ *
+ * The real reservation will occur during write to EP_CFG register,
+ * this function is used to check if the 'size' reservation is allowed.
+ *
+ * @priv_dev: extended gadget object
+ * @size: the size (KB) for EP would like to allocate
+ * @is_in: endpoint direction
+ *
+ * Return 0 if the required size can met or negative value on failure
+ */
+static int cdns3_ep_onchip_buffer_reserve(struct cdns3_device *priv_dev,
+					  int size, int is_in)
+{
+	int remained;
+
+	/* 2KB are reserved for EP0*/
+	remained = priv_dev->onchip_buffers - priv_dev->onchip_used_size - 2;
+
+	if (is_in) {
+		if (remained < size)
+			return -EPERM;
+
+		priv_dev->onchip_used_size += size;
+	} else {
+		int required;
+
+		/**
+		 *  ALL OUT EPs are shared the same chunk onchip memory, so
+		 * driver checks if it already has assigned enough buffers
+		 */
+		if (priv_dev->out_mem_is_allocated >= size)
+			return 0;
+
+		required = size - priv_dev->out_mem_is_allocated;
+
+		if (required > remained)
+			return -EPERM;
+
+		priv_dev->out_mem_is_allocated += required;
+		priv_dev->onchip_used_size += required;
+	}
+
+	return 0;
+}
+
+static void cdns3_configure_dmult(struct cdns3_device *priv_dev,
+				  struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+
+	/* For dev_ver > DEV_VER_V2 DMULT is configured per endpoint */
+	if (priv_dev->dev_ver <= DEV_VER_V2)
+		writel(USB_CONF_DMULT, &regs->usb_conf);
+
+	if (priv_dev->dev_ver == DEV_VER_V2)
+		writel(USB_CONF2_EN_TDL_TRB, &regs->usb_conf2);
+
+	if (priv_dev->dev_ver >= DEV_VER_V3 && priv_ep) {
+		u32 mask;
+
+		if (priv_ep->dir)
+			mask = BIT(priv_ep->num + 16);
+		else
+			mask = BIT(priv_ep->num);
+
+		if (priv_ep->type != USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
+			cdns3_set_register_bit(&regs->tdl_from_trb, mask);
+			cdns3_set_register_bit(&regs->tdl_beh, mask);
+			cdns3_set_register_bit(&regs->tdl_beh2, mask);
+			cdns3_set_register_bit(&regs->dma_adv_td, mask);
+		}
+
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir)
+			cdns3_set_register_bit(&regs->tdl_from_trb, mask);
+
+		cdns3_set_register_bit(&regs->dtrans, mask);
+	}
+}
+
+/**
+ * cdns3_ep_config - Configure hardware endpoint
+ * @priv_ep: extended endpoint object
+ * @enable: set EP_CFG_ENABLE bit in ep_cfg register.
+ */
+int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
+{
+	bool is_iso_ep = (priv_ep->type == USB_ENDPOINT_XFER_ISOC);
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	u32 bEndpointAddress = priv_ep->num | priv_ep->dir;
+	u32 max_packet_size = priv_ep->wMaxPacketSize;
+	u8 maxburst = priv_ep->bMaxBurst;
+	u32 ep_cfg = 0;
+	u8 buffering;
+	int ret;
+
+	buffering = priv_dev->ep_buf_size - 1;
+
+	cdns3_configure_dmult(priv_dev, priv_ep);
+
+	switch (priv_ep->type) {
+	case USB_ENDPOINT_XFER_INT:
+		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_INT);
+
+		if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
+			ep_cfg |= EP_CFG_TDL_CHK;
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_BULK);
+
+		if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
+			ep_cfg |= EP_CFG_TDL_CHK;
+		break;
+	default:
+		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
+		buffering = (priv_ep->bMaxBurst + 1) * (priv_ep->mult + 1) - 1;
+	}
+
+	switch (priv_dev->gadget.speed) {
+	case USB_SPEED_FULL:
+		max_packet_size = is_iso_ep ? 1023 : 64;
+		break;
+	case USB_SPEED_HIGH:
+		max_packet_size = is_iso_ep ? 1024 : 512;
+		break;
+	case USB_SPEED_SUPER:
+		if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+			max_packet_size = 1024;
+			maxburst = priv_dev->ep_buf_size - 1;
+		}
+		break;
+	default:
+		/* all other speed are not supported */
+		return -EINVAL;
+	}
+
+	if (max_packet_size == 1024)
+		priv_ep->trb_burst_size = 128;
+	else if (max_packet_size >= 512)
+		priv_ep->trb_burst_size = 64;
+	else
+		priv_ep->trb_burst_size = 16;
+
+	/*
+	 * In versions preceding DEV_VER_V2, for example, iMX8QM, there exit the bugs
+	 * in the DMA. These bugs occur when the trb_burst_size exceeds 16 and the
+	 * address is not aligned to 128 Bytes (which is a product of the 64-bit AXI
+	 * and AXI maximum burst length of 16 or 0xF+1, dma_axi_ctrl0[3:0]). This
+	 * results in data corruption when it crosses the 4K border. The corruption
+	 * specifically occurs from the position (4K - (address & 0x7F)) to 4K.
+	 *
+	 * So force trb_burst_size to 16 at such platform.
+	 */
+	if (priv_dev->dev_ver < DEV_VER_V2)
+		priv_ep->trb_burst_size = 16;
+
+	buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
+	maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
+
+	/* onchip buffer is only allocated before configuration */
+	if (!priv_dev->hw_configured_flag) {
+		ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1,
+						     !!priv_ep->dir);
+		if (ret) {
+			dev_err(priv_dev->dev, "onchip mem is full, ep is invalid\n");
+			return ret;
+		}
+	}
+
+	if (enable)
+		ep_cfg |= EP_CFG_ENABLE;
+
+	if (priv_ep->use_streams && priv_dev->gadget.speed >= USB_SPEED_SUPER) {
+		if (priv_dev->dev_ver >= DEV_VER_V3) {
+			u32 mask = BIT(priv_ep->num + (priv_ep->dir ? 16 : 0));
+
+			/*
+			 * Stream capable endpoints are handled by using ep_tdl
+			 * register. Other endpoints use TDL from TRB feature.
+			 */
+			cdns3_clear_register_bit(&priv_dev->regs->tdl_from_trb,
+						 mask);
+		}
+
+		/*  Enable Stream Bit TDL chk and SID chk */
+		ep_cfg |=  EP_CFG_STREAM_EN | EP_CFG_TDL_CHK | EP_CFG_SID_CHK;
+	}
+
+	ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) |
+		  EP_CFG_MULT(priv_ep->mult) |			/* must match EP setting */
+		  EP_CFG_BUFFERING(buffering) |
+		  EP_CFG_MAXBURST(maxburst);
+
+	cdns3_select_ep(priv_dev, bEndpointAddress);
+	writel(ep_cfg, &priv_dev->regs->ep_cfg);
+	priv_ep->flags |= EP_CONFIGURED;
+
+	dev_dbg(priv_dev->dev, "Configure %s: with val %08x\n",
+		priv_ep->name, ep_cfg);
+
+	return 0;
+}
+
+/* Find correct direction for HW endpoint according to description */
+static int cdns3_ep_dir_is_correct(struct usb_endpoint_descriptor *desc,
+				   struct cdns3_endpoint *priv_ep)
+{
+	return (priv_ep->endpoint.caps.dir_in && usb_endpoint_dir_in(desc)) ||
+	       (priv_ep->endpoint.caps.dir_out && usb_endpoint_dir_out(desc));
+}
+
+static struct
+cdns3_endpoint *cdns3_find_available_ep(struct cdns3_device *priv_dev,
+					struct usb_endpoint_descriptor *desc)
+{
+	struct usb_ep *ep;
+	struct cdns3_endpoint *priv_ep;
+
+	list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+		unsigned long num;
+		int ret;
+		/* ep name pattern likes epXin or epXout */
+		char c[2] = {ep->name[2], '\0'};
+
+		ret = kstrtoul(c, 10, &num);
+		if (ret)
+			return ERR_PTR(ret);
+
+		priv_ep = ep_to_cdns3_ep(ep);
+		if (cdns3_ep_dir_is_correct(desc, priv_ep)) {
+			if (!(priv_ep->flags & EP_CLAIMED)) {
+				priv_ep->num  = num;
+				return priv_ep;
+			}
+		}
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+
+/*
+ *  Cadence IP has one limitation that all endpoints must be configured
+ * (Type & MaxPacketSize) before setting configuration through hardware
+ * register, it means we can't change endpoints configuration after
+ * set_configuration.
+ *
+ * This function set EP_CLAIMED flag which is added when the gadget driver
+ * uses usb_ep_autoconfig to configure specific endpoint;
+ * When the udc driver receives set_configurion request,
+ * it goes through all claimed endpoints, and configure all endpoints
+ * accordingly.
+ *
+ * At usb_ep_ops.enable/disable, we only enable and disable endpoint through
+ * ep_cfg register which can be changed after set_configuration, and do
+ * some software operation accordingly.
+ */
+static struct
+usb_ep *cdns3_gadget_match_ep(struct usb_gadget *gadget,
+			      struct usb_endpoint_descriptor *desc,
+			      struct usb_ss_ep_comp_descriptor *comp_desc)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	struct cdns3_endpoint *priv_ep;
+	unsigned long flags;
+
+	priv_ep = cdns3_find_available_ep(priv_dev, desc);
+	if (IS_ERR(priv_ep)) {
+		dev_err(priv_dev->dev, "no available ep\n");
+		return NULL;
+	}
+
+	dev_dbg(priv_dev->dev, "match endpoint: %s\n", priv_ep->name);
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	priv_ep->endpoint.desc = desc;
+	priv_ep->dir  = usb_endpoint_dir_in(desc) ? USB_DIR_IN : USB_DIR_OUT;
+	priv_ep->type = usb_endpoint_type(desc);
+	priv_ep->flags |= EP_CLAIMED;
+	priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+	priv_ep->wMaxPacketSize =  usb_endpoint_maxp(desc);
+	priv_ep->mult = USB_EP_MAXP_MULT(priv_ep->wMaxPacketSize);
+	priv_ep->wMaxPacketSize &= USB_ENDPOINT_MAXP_MASK;
+	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && comp_desc) {
+		priv_ep->mult =  USB_SS_MULT(comp_desc->bmAttributes) - 1;
+		priv_ep->bMaxBurst = comp_desc->bMaxBurst;
+	}
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return &priv_ep->endpoint;
+}
+
+/**
+ * cdns3_gadget_ep_alloc_request - Allocates request
+ * @ep: endpoint object associated with request
+ * @gfp_flags: gfp flags
+ *
+ * Returns allocated request address, NULL on allocation error
+ */
+struct usb_request *cdns3_gadget_ep_alloc_request(struct usb_ep *ep,
+						  gfp_t gfp_flags)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_request *priv_req;
+
+	priv_req = kzalloc(sizeof(*priv_req), gfp_flags);
+	if (!priv_req)
+		return NULL;
+
+	priv_req->priv_ep = priv_ep;
+
+	trace_cdns3_alloc_request(priv_req);
+	return &priv_req->request;
+}
+
+/**
+ * cdns3_gadget_ep_free_request - Free memory occupied by request
+ * @ep: endpoint object associated with request
+ * @request: request to free memory
+ */
+void cdns3_gadget_ep_free_request(struct usb_ep *ep,
+				  struct usb_request *request)
+{
+	struct cdns3_request *priv_req = to_cdns3_request(request);
+
+	if (priv_req->aligned_buf)
+		priv_req->aligned_buf->in_use = 0;
+
+	trace_cdns3_free_request(priv_req);
+	kfree(priv_req);
+}
+
+/**
+ * cdns3_gadget_ep_enable - Enable endpoint
+ * @ep: endpoint object
+ * @desc: endpoint descriptor
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep_enable(struct usb_ep *ep,
+				  const struct usb_endpoint_descriptor *desc)
+{
+	struct cdns3_endpoint *priv_ep;
+	struct cdns3_device *priv_dev;
+	const struct usb_ss_ep_comp_descriptor *comp_desc;
+	u32 reg = EP_STS_EN_TRBERREN;
+	u32 bEndpointAddress;
+	unsigned long flags;
+	int enable = 1;
+	int ret = 0;
+	int val;
+
+	if (!ep) {
+		pr_debug("usbss: ep not configured?\n");
+		return -EINVAL;
+	}
+
+	priv_ep = ep_to_cdns3_ep(ep);
+	priv_dev = priv_ep->cdns3_dev;
+	comp_desc = priv_ep->endpoint.comp_desc;
+
+	if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+		dev_dbg(priv_dev->dev, "usbss: invalid parameters\n");
+		return -EINVAL;
+	}
+
+	if (!desc->wMaxPacketSize) {
+		dev_err(priv_dev->dev, "usbss: missing wMaxPacketSize\n");
+		return -EINVAL;
+	}
+
+	if (dev_WARN_ONCE(priv_dev->dev, priv_ep->flags & EP_ENABLED,
+			  "%s is already enabled\n", priv_ep->name))
+		return 0;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	priv_ep->endpoint.desc = desc;
+	priv_ep->type = usb_endpoint_type(desc);
+	priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+
+	if (priv_ep->interval > ISO_MAX_INTERVAL &&
+	    priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+		dev_err(priv_dev->dev, "Driver is limited to %d period\n",
+			ISO_MAX_INTERVAL);
+
+		ret =  -EINVAL;
+		goto exit;
+	}
+
+	bEndpointAddress = priv_ep->num | priv_ep->dir;
+	cdns3_select_ep(priv_dev, bEndpointAddress);
+
+	/*
+	 * For some versions of controller at some point during ISO OUT traffic
+	 * DMA reads Transfer Ring for the EP which has never got doorbell.
+	 * This issue was detected only on simulation, but to avoid this issue
+	 * driver add protection against it. To fix it driver enable ISO OUT
+	 * endpoint before setting DRBL. This special treatment of ISO OUT
+	 * endpoints are recommended by controller specification.
+	 */
+	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir)
+		enable = 0;
+
+	if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
+		/*
+		 * Enable stream support (SS mode) related interrupts
+		 * in EP_STS_EN Register
+		 */
+		if (priv_dev->gadget.speed >= USB_SPEED_SUPER) {
+			reg |= EP_STS_EN_IOTEN | EP_STS_EN_PRIMEEEN |
+				EP_STS_EN_SIDERREN | EP_STS_EN_MD_EXITEN |
+				EP_STS_EN_STREAMREN;
+			priv_ep->use_streams = true;
+			ret = cdns3_ep_config(priv_ep, enable);
+			priv_dev->using_streams |= true;
+		}
+	} else {
+		ret = cdns3_ep_config(priv_ep, enable);
+	}
+
+	if (ret)
+		goto exit;
+
+	ret = cdns3_allocate_trb_pool(priv_ep);
+	if (ret)
+		goto exit;
+
+	bEndpointAddress = priv_ep->num | priv_ep->dir;
+	cdns3_select_ep(priv_dev, bEndpointAddress);
+
+	trace_cdns3_gadget_ep_enable(priv_ep);
+
+	writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+	ret = readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+					!(val & (EP_CMD_CSTALL | EP_CMD_EPRST)),
+					1, 1000);
+
+	if (unlikely(ret)) {
+		cdns3_free_trb_pool(priv_ep);
+		ret =  -EINVAL;
+		goto exit;
+	}
+
+	/* enable interrupt for selected endpoint */
+	cdns3_set_register_bit(&priv_dev->regs->ep_ien,
+			       BIT(cdns3_ep_addr_to_index(bEndpointAddress)));
+
+	if (priv_dev->dev_ver < DEV_VER_V2)
+		cdns3_wa2_enable_detection(priv_dev, priv_ep, reg);
+
+	writel(reg, &priv_dev->regs->ep_sts_en);
+
+	ep->desc = desc;
+	priv_ep->flags &= ~(EP_PENDING_REQUEST | EP_STALLED | EP_STALL_PENDING |
+			    EP_QUIRK_ISO_OUT_EN | EP_QUIRK_EXTRA_BUF_EN);
+	priv_ep->flags |= EP_ENABLED | EP_UPDATE_EP_TRBADDR;
+	priv_ep->wa1_set = 0;
+	priv_ep->enqueue = 0;
+	priv_ep->dequeue = 0;
+	reg = readl(&priv_dev->regs->ep_sts);
+	priv_ep->pcs = !!EP_STS_CCS(reg);
+	priv_ep->ccs = !!EP_STS_CCS(reg);
+	/* one TRB is reserved for link TRB used in DMULT mode*/
+	priv_ep->free_trbs = priv_ep->num_trbs - 1;
+exit:
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+	return ret;
+}
+
+/**
+ * cdns3_gadget_ep_disable - Disable endpoint
+ * @ep: endpoint object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep_disable(struct usb_ep *ep)
+{
+	struct cdns3_endpoint *priv_ep;
+	struct cdns3_request *priv_req;
+	struct cdns3_device *priv_dev;
+	struct usb_request *request;
+	unsigned long flags;
+	int ret = 0;
+	u32 ep_cfg;
+	int val;
+
+	if (!ep) {
+		pr_err("usbss: invalid parameters\n");
+		return -EINVAL;
+	}
+
+	priv_ep = ep_to_cdns3_ep(ep);
+	priv_dev = priv_ep->cdns3_dev;
+
+	if (dev_WARN_ONCE(priv_dev->dev, !(priv_ep->flags & EP_ENABLED),
+			  "%s is already disabled\n", priv_ep->name))
+		return 0;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	trace_cdns3_gadget_ep_disable(priv_ep);
+
+	cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+	ep_cfg = readl(&priv_dev->regs->ep_cfg);
+	ep_cfg &= ~EP_CFG_ENABLE;
+	writel(ep_cfg, &priv_dev->regs->ep_cfg);
+
+	/**
+	 * Driver needs some time before resetting endpoint.
+	 * It need waits for clearing DBUSY bit or for timeout expired.
+	 * 10us is enough time for controller to stop transfer.
+	 */
+	readl_poll_timeout_atomic(&priv_dev->regs->ep_sts, val,
+				  !(val & EP_STS_DBUSY), 1, 10);
+	writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+	readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+				  !(val & (EP_CMD_CSTALL | EP_CMD_EPRST)),
+				  1, 1000);
+	if (unlikely(ret))
+		dev_err(priv_dev->dev, "Timeout: %s resetting failed.\n",
+			priv_ep->name);
+
+	while (!list_empty(&priv_ep->pending_req_list)) {
+		request = cdns3_next_request(&priv_ep->pending_req_list);
+
+		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+				      -ESHUTDOWN);
+	}
+
+	while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+		priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+
+		kfree(priv_req->request.buf);
+		cdns3_gadget_ep_free_request(&priv_ep->endpoint,
+					     &priv_req->request);
+		list_del_init(&priv_req->list);
+		--priv_ep->wa2_counter;
+	}
+
+	while (!list_empty(&priv_ep->deferred_req_list)) {
+		request = cdns3_next_request(&priv_ep->deferred_req_list);
+
+		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+				      -ESHUTDOWN);
+	}
+
+	priv_ep->descmis_req = NULL;
+
+	ep->desc = NULL;
+	priv_ep->flags &= ~EP_ENABLED;
+	priv_ep->use_streams = false;
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+	return ret;
+}
+
+/**
+ * __cdns3_gadget_ep_queue - Transfer data on endpoint
+ * @ep: endpoint object
+ * @request: request object
+ * @gfp_flags: gfp flags
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
+				   struct usb_request *request,
+				   gfp_t gfp_flags)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct cdns3_request *priv_req;
+	int ret = 0;
+
+	request->actual = 0;
+	request->status = -EINPROGRESS;
+	priv_req = to_cdns3_request(request);
+	trace_cdns3_ep_queue(priv_req);
+
+	if (priv_dev->dev_ver < DEV_VER_V2) {
+		ret = cdns3_wa2_gadget_ep_queue(priv_dev, priv_ep,
+						priv_req);
+
+		if (ret == EINPROGRESS)
+			return 0;
+	}
+
+	ret = cdns3_prepare_aligned_request_buf(priv_req);
+	if (ret < 0)
+		return ret;
+
+	if (likely(!(priv_req->flags & REQUEST_UNALIGNED))) {
+		ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
+					    usb_endpoint_dir_in(ep->desc));
+		if (ret)
+			return ret;
+	}
+
+	list_add_tail(&request->list, &priv_ep->deferred_req_list);
+
+	/*
+	 * For stream capable endpoint if prime irq flag is set then only start
+	 * request.
+	 * If hardware endpoint configuration has not been set yet then
+	 * just queue request in deferred list. Transfer will be started in
+	 * cdns3_set_hw_configuration.
+	 */
+	if (!request->stream_id) {
+		if (priv_dev->hw_configured_flag &&
+		    !(priv_ep->flags & EP_STALLED) &&
+		    !(priv_ep->flags & EP_STALL_PENDING))
+			cdns3_start_all_request(priv_dev, priv_ep);
+	} else {
+		if (priv_dev->hw_configured_flag && priv_ep->prime_flag)
+			cdns3_start_all_request(priv_dev, priv_ep);
+	}
+
+	return 0;
+}
+
+static int cdns3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
+				 gfp_t gfp_flags)
+{
+	struct usb_request *zlp_request;
+	struct cdns3_endpoint *priv_ep;
+	struct cdns3_device *priv_dev;
+	unsigned long flags;
+	int ret;
+
+	if (!request || !ep)
+		return -EINVAL;
+
+	priv_ep = ep_to_cdns3_ep(ep);
+	priv_dev = priv_ep->cdns3_dev;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	ret = __cdns3_gadget_ep_queue(ep, request, gfp_flags);
+
+	if (ret == 0 && request->zero && request->length &&
+	    (request->length % ep->maxpacket == 0)) {
+		struct cdns3_request *priv_req;
+
+		zlp_request = cdns3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
+		zlp_request->buf = priv_dev->zlp_buf;
+		zlp_request->length = 0;
+
+		priv_req = to_cdns3_request(zlp_request);
+		priv_req->flags |= REQUEST_ZLP;
+
+		dev_dbg(priv_dev->dev, "Queuing ZLP for endpoint: %s\n",
+			priv_ep->name);
+		ret = __cdns3_gadget_ep_queue(ep, zlp_request, gfp_flags);
+	}
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return ret;
+}
+
+/**
+ * cdns3_gadget_ep_dequeue - Remove request from transfer queue
+ * @ep: endpoint object associated with request
+ * @request: request object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+int cdns3_gadget_ep_dequeue(struct usb_ep *ep,
+			    struct usb_request *request)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_device *priv_dev;
+	struct usb_request *req, *req_temp;
+	struct cdns3_request *priv_req;
+	struct cdns3_trb *link_trb;
+	u8 req_on_hw_ring = 0;
+	unsigned long flags;
+	int ret = 0;
+	int val;
+
+	if (!ep || !request || !ep->desc)
+		return -EINVAL;
+
+	priv_dev = priv_ep->cdns3_dev;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	priv_req = to_cdns3_request(request);
+
+	trace_cdns3_ep_dequeue(priv_req);
+
+	cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+	list_for_each_entry_safe(req, req_temp, &priv_ep->pending_req_list,
+				 list) {
+		if (request == req) {
+			req_on_hw_ring = 1;
+			goto found;
+		}
+	}
+
+	list_for_each_entry_safe(req, req_temp, &priv_ep->deferred_req_list,
+				 list) {
+		if (request == req)
+			goto found;
+	}
+
+	goto not_found;
+
+found:
+	link_trb = priv_req->trb;
+
+	/* Update ring only if removed request is on pending_req_list list */
+	if (req_on_hw_ring && link_trb) {
+		/* Stop DMA */
+		writel(EP_CMD_DFLUSH, &priv_dev->regs->ep_cmd);
+
+		/* wait for DFLUSH cleared */
+		readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+					  !(val & EP_CMD_DFLUSH), 1, 1000);
+
+		link_trb->buffer = cpu_to_le32(TRB_BUFFER(priv_ep->trb_pool_dma +
+			((priv_req->end_trb + 1) * TRB_SIZE)));
+		link_trb->control = cpu_to_le32((le32_to_cpu(link_trb->control) & TRB_CYCLE) |
+				    TRB_TYPE(TRB_LINK) | TRB_CHAIN);
+
+		if (priv_ep->wa1_trb == priv_req->trb)
+			cdns3_wa1_restore_cycle_bit(priv_ep);
+	}
+
+	cdns3_gadget_giveback(priv_ep, priv_req, -ECONNRESET);
+
+	req = cdns3_next_request(&priv_ep->pending_req_list);
+	if (req)
+		cdns3_rearm_transfer(priv_ep, 1);
+
+not_found:
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return ret;
+}
+
+/**
+ * __cdns3_gadget_ep_set_halt - Sets stall on selected endpoint
+ * Should be called after acquiring spin_lock and selecting ep
+ * @priv_ep: endpoint object to set stall on.
+ */
+void __cdns3_gadget_ep_set_halt(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+	trace_cdns3_halt(priv_ep, 1, 0);
+
+	if (!(priv_ep->flags & EP_STALLED)) {
+		u32 ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+
+		if (!(ep_sts_reg & EP_STS_DBUSY))
+			cdns3_ep_stall_flush(priv_ep);
+		else
+			priv_ep->flags |= EP_STALL_PENDING;
+	}
+}
+
+/**
+ * __cdns3_gadget_ep_clear_halt - Clears stall on selected endpoint
+ * Should be called after acquiring spin_lock and selecting ep
+ * @priv_ep: endpoint object to clear stall on
+ */
+int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
+{
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	struct usb_request *request;
+	struct cdns3_request *priv_req;
+	struct cdns3_trb *trb = NULL;
+	struct cdns3_trb trb_tmp;
+	int ret;
+	int val;
+
+	trace_cdns3_halt(priv_ep, 0, 0);
+
+	request = cdns3_next_request(&priv_ep->pending_req_list);
+	if (request) {
+		priv_req = to_cdns3_request(request);
+		trb = priv_req->trb;
+		if (trb) {
+			trb_tmp = *trb;
+			trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE);
+		}
+	}
+
+	writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+	/* wait for EPRST cleared */
+	ret = readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+					!(val & EP_CMD_EPRST), 1, 100);
+	if (ret)
+		return -EINVAL;
+
+	priv_ep->flags &= ~(EP_STALLED | EP_STALL_PENDING);
+
+	if (request) {
+		if (trb)
+			*trb = trb_tmp;
+
+		cdns3_rearm_transfer(priv_ep, 1);
+	}
+
+	cdns3_start_all_request(priv_dev, priv_ep);
+	return ret;
+}
+
+/**
+ * cdns3_gadget_ep_set_halt - Sets/clears stall on selected endpoint
+ * @ep: endpoint object to set/clear stall on
+ * @value: 1 for set stall, 0 for clear stall
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+int cdns3_gadget_ep_set_halt(struct usb_ep *ep, int value)
+{
+	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+	unsigned long flags;
+	int ret = 0;
+
+	if (!(priv_ep->flags & EP_ENABLED))
+		return -EPERM;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+
+	cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+	if (!value) {
+		priv_ep->flags &= ~EP_WEDGE;
+		ret = __cdns3_gadget_ep_clear_halt(priv_ep);
+	} else {
+		__cdns3_gadget_ep_set_halt(priv_ep);
+	}
+
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+	return ret;
+}
+
+extern const struct usb_ep_ops cdns3_gadget_ep0_ops;
+
+static const struct usb_ep_ops cdns3_gadget_ep_ops = {
+	.enable = cdns3_gadget_ep_enable,
+	.disable = cdns3_gadget_ep_disable,
+	.alloc_request = cdns3_gadget_ep_alloc_request,
+	.free_request = cdns3_gadget_ep_free_request,
+	.queue = cdns3_gadget_ep_queue,
+	.dequeue = cdns3_gadget_ep_dequeue,
+	.set_halt = cdns3_gadget_ep_set_halt,
+	.set_wedge = cdns3_gadget_ep_set_wedge,
+};
+
+/**
+ * cdns3_gadget_get_frame - Returns number of actual ITP frame
+ * @gadget: gadget object
+ *
+ * Returns number of actual ITP frame
+ */
+static int cdns3_gadget_get_frame(struct usb_gadget *gadget)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+
+	return readl(&priv_dev->regs->usb_itpn);
+}
+
+int __cdns3_gadget_wakeup(struct cdns3_device *priv_dev)
+{
+	enum usb_device_speed speed;
+
+	speed = cdns3_get_speed(priv_dev);
+
+	if (speed >= USB_SPEED_SUPER)
+		return 0;
+
+	/* Start driving resume signaling to indicate remote wakeup. */
+	writel(USB_CONF_LGO_L0, &priv_dev->regs->usb_conf);
+
+	return 0;
+}
+
+static int cdns3_gadget_wakeup(struct usb_gadget *gadget)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	ret = __cdns3_gadget_wakeup(priv_dev);
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return ret;
+}
+
+static int cdns3_gadget_set_selfpowered(struct usb_gadget *gadget,
+					int is_selfpowered)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	priv_dev->is_selfpowered = !!is_selfpowered;
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return 0;
+}
+
+static int cdns3_gadget_pullup(struct usb_gadget *gadget, int is_on)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+
+	if (is_on) {
+		writel(USB_CONF_DEVEN, &priv_dev->regs->usb_conf);
+	} else {
+		writel(~0, &priv_dev->regs->ep_ists);
+		writel(~0, &priv_dev->regs->usb_ists);
+		writel(USB_CONF_DEVDS, &priv_dev->regs->usb_conf);
+	}
+
+	return 0;
+}
+
+static void cdns3_gadget_config(struct cdns3_device *priv_dev)
+{
+	struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+	u32 reg;
+
+	cdns3_ep0_config(priv_dev);
+
+	/* enable interrupts for endpoint 0 (in and out) */
+	writel(EP_IEN_EP_OUT0 | EP_IEN_EP_IN0, &regs->ep_ien);
+
+	/*
+	 * Driver needs to modify LFPS minimal U1 Exit time for DEV_VER_TI_V1
+	 * revision of controller.
+	 */
+	if (priv_dev->dev_ver == DEV_VER_TI_V1) {
+		reg = readl(&regs->dbg_link1);
+
+		reg &= ~DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_MASK;
+		reg |= DBG_LINK1_LFPS_MIN_GEN_U1_EXIT(0x55) |
+		       DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_SET;
+		writel(reg, &regs->dbg_link1);
+	}
+
+	/*
+	 * By default some platforms has set protected access to memory.
+	 * This cause problem with cache, so driver restore non-secure
+	 * access to memory.
+	 */
+	reg = readl(&regs->dma_axi_ctrl);
+	reg |= DMA_AXI_CTRL_MARPROT(DMA_AXI_CTRL_NON_SECURE) |
+	       DMA_AXI_CTRL_MAWPROT(DMA_AXI_CTRL_NON_SECURE);
+	writel(reg, &regs->dma_axi_ctrl);
+
+	/* enable generic interrupt*/
+	writel(USB_IEN_INIT, &regs->usb_ien);
+	writel(USB_CONF_CLK2OFFDS | USB_CONF_L1DS, &regs->usb_conf);
+	/*  keep Fast Access bit */
+	writel(PUSB_PWR_FST_REG_ACCESS, &priv_dev->regs->usb_pwr);
+
+	cdns3_configure_dmult(priv_dev, NULL);
+}
+
+/**
+ * cdns3_gadget_udc_start - Gadget start
+ * @gadget: gadget object
+ * @driver: driver which operates on this gadget
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_udc_start(struct usb_gadget *gadget,
+				  struct usb_gadget_driver *driver)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	unsigned long flags;
+	enum usb_device_speed max_speed = driver->max_speed;
+
+	spin_lock_irqsave(&priv_dev->lock, flags);
+	priv_dev->gadget_driver = driver;
+
+	/* limit speed if necessary */
+	max_speed = min(driver->max_speed, gadget->max_speed);
+
+	switch (max_speed) {
+	case USB_SPEED_FULL:
+		writel(USB_CONF_SFORCE_FS, &priv_dev->regs->usb_conf);
+		writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
+		break;
+	case USB_SPEED_HIGH:
+		writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
+		break;
+	case USB_SPEED_SUPER:
+		break;
+	default:
+		dev_err(priv_dev->dev,
+			"invalid maximum_speed parameter %d\n",
+			max_speed);
+		fallthrough;
+	case USB_SPEED_UNKNOWN:
+		/* default to superspeed */
+		max_speed = USB_SPEED_SUPER;
+		break;
+	}
+
+	cdns3_gadget_config(priv_dev);
+	spin_unlock_irqrestore(&priv_dev->lock, flags);
+	return 0;
+}
+
+/**
+ * cdns3_gadget_udc_stop - Stops gadget
+ * @gadget: gadget object
+ *
+ * Returns 0
+ */
+static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	struct cdns3_endpoint *priv_ep;
+	u32 bEndpointAddress;
+	struct usb_ep *ep;
+	int val;
+
+	priv_dev->gadget_driver = NULL;
+
+	priv_dev->onchip_used_size = 0;
+	priv_dev->out_mem_is_allocated = 0;
+	priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+	list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+		priv_ep = ep_to_cdns3_ep(ep);
+		bEndpointAddress = priv_ep->num | priv_ep->dir;
+		cdns3_select_ep(priv_dev, bEndpointAddress);
+		writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+		readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+					  !(val & EP_CMD_EPRST), 1, 100);
+
+		priv_ep->flags &= ~EP_CLAIMED;
+	}
+
+	/* disable interrupt for device */
+	writel(0, &priv_dev->regs->usb_ien);
+	writel(0, &priv_dev->regs->usb_pwr);
+	writel(USB_CONF_DEVDS, &priv_dev->regs->usb_conf);
+
+	return 0;
+}
+
+/**
+ * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
+ * @gadget: pointer to the USB gadget
+ *
+ * Used to record the maximum number of endpoints being used in a USB composite
+ * device. (across all configurations)  This is to be used in the calculation
+ * of the TXFIFO sizes when resizing internal memory for individual endpoints.
+ * It will help ensured that the resizing logic reserves enough space for at
+ * least one max packet.
+ */
+static int cdns3_gadget_check_config(struct usb_gadget *gadget)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	struct cdns3_endpoint *priv_ep;
+	struct usb_ep *ep;
+	int n_in = 0;
+	int iso = 0;
+	int out = 1;
+	int total;
+	int n;
+
+	list_for_each_entry(ep, &gadget->ep_list, ep_list) {
+		priv_ep = ep_to_cdns3_ep(ep);
+		if (!(priv_ep->flags & EP_CLAIMED))
+			continue;
+
+		n = (priv_ep->mult + 1) * (priv_ep->bMaxBurst + 1);
+		if (ep->address & USB_DIR_IN) {
+			/*
+			 * ISO transfer: DMA start move data when get ISO, only transfer
+			 * data as min(TD size, iso). No benefit for allocate bigger
+			 * internal memory than 'iso'.
+			 */
+			if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				iso += n;
+			else
+				n_in++;
+		} else {
+			if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				out = max_t(int, out, n);
+		}
+	}
+
+	/* 2KB are reserved for EP0, 1KB for out*/
+	total = 2 + n_in + out + iso;
+
+	if (total > priv_dev->onchip_buffers)
+		return -ENOMEM;
+
+	priv_dev->ep_buf_size = (priv_dev->onchip_buffers - 2 - iso) / (n_in + out);
+
+	return 0;
+}
+
+static const struct usb_gadget_ops cdns3_gadget_ops = {
+	.get_frame = cdns3_gadget_get_frame,
+	.wakeup = cdns3_gadget_wakeup,
+	.set_selfpowered = cdns3_gadget_set_selfpowered,
+	.pullup = cdns3_gadget_pullup,
+	.udc_start = cdns3_gadget_udc_start,
+	.udc_stop = cdns3_gadget_udc_stop,
+	.match_ep = cdns3_gadget_match_ep,
+	.check_config = cdns3_gadget_check_config,
+};
+
+static void cdns3_free_all_eps(struct cdns3_device *priv_dev)
+{
+	int i;
+
+	/* ep0 OUT point to ep0 IN. */
+	priv_dev->eps[16] = NULL;
+
+	for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++)
+		if (priv_dev->eps[i]) {
+			cdns3_free_trb_pool(priv_dev->eps[i]);
+			devm_kfree(priv_dev->dev, priv_dev->eps[i]);
+		}
+}
+
+/**
+ * cdns3_init_eps - Initializes software endpoints of gadget
+ * @priv_dev: extended gadget object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_init_eps(struct cdns3_device *priv_dev)
+{
+	u32 ep_enabled_reg, iso_ep_reg;
+	struct cdns3_endpoint *priv_ep;
+	int ep_dir, ep_number;
+	u32 ep_mask;
+	int ret = 0;
+	int i;
+
+	/* Read it from USB_CAP3 to USB_CAP5 */
+	ep_enabled_reg = readl(&priv_dev->regs->usb_cap3);
+	iso_ep_reg = readl(&priv_dev->regs->usb_cap4);
+
+	dev_dbg(priv_dev->dev, "Initializing non-zero endpoints\n");
+
+	for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
+		ep_dir = i >> 4;	/* i div 16 */
+		ep_number = i & 0xF;	/* i % 16 */
+		ep_mask = BIT(i);
+
+		if (!(ep_enabled_reg & ep_mask))
+			continue;
+
+		if (ep_dir && !ep_number) {
+			priv_dev->eps[i] = priv_dev->eps[0];
+			continue;
+		}
+
+		priv_ep = devm_kzalloc(priv_dev->dev, sizeof(*priv_ep),
+				       GFP_KERNEL);
+		if (!priv_ep)
+			goto err;
+
+		/* set parent of endpoint object */
+		priv_ep->cdns3_dev = priv_dev;
+		priv_dev->eps[i] = priv_ep;
+		priv_ep->num = ep_number;
+		priv_ep->dir = ep_dir ? USB_DIR_IN : USB_DIR_OUT;
+
+		if (!ep_number) {
+			ret = cdns3_init_ep0(priv_dev, priv_ep);
+			if (ret) {
+				dev_err(priv_dev->dev, "Failed to init ep0\n");
+				goto err;
+			}
+		} else {
+			snprintf(priv_ep->name, sizeof(priv_ep->name), "ep%d%s",
+				 ep_number, !!ep_dir ? "in" : "out");
+			priv_ep->endpoint.name = priv_ep->name;
+
+			usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
+						   CDNS3_EP_MAX_PACKET_LIMIT);
+			priv_ep->endpoint.max_streams = CDNS3_EP_MAX_STREAMS;
+			priv_ep->endpoint.ops = &cdns3_gadget_ep_ops;
+			if (ep_dir)
+				priv_ep->endpoint.caps.dir_in = 1;
+			else
+				priv_ep->endpoint.caps.dir_out = 1;
+
+			if (iso_ep_reg & ep_mask)
+				priv_ep->endpoint.caps.type_iso = 1;
+
+			priv_ep->endpoint.caps.type_bulk = 1;
+			priv_ep->endpoint.caps.type_int = 1;
+
+			list_add_tail(&priv_ep->endpoint.ep_list,
+				      &priv_dev->gadget.ep_list);
+		}
+
+		priv_ep->flags = 0;
+
+		dev_dbg(priv_dev->dev, "Initialized  %s support: %s %s\n",
+			 priv_ep->name,
+			 priv_ep->endpoint.caps.type_bulk ? "BULK, INT" : "",
+			 priv_ep->endpoint.caps.type_iso ? "ISO" : "");
+
+		INIT_LIST_HEAD(&priv_ep->pending_req_list);
+		INIT_LIST_HEAD(&priv_ep->deferred_req_list);
+		INIT_LIST_HEAD(&priv_ep->wa2_descmiss_req_list);
+	}
+
+	return 0;
+err:
+	cdns3_free_all_eps(priv_dev);
+	return -ENOMEM;
+}
+
+static void cdns3_gadget_release(struct device *dev)
+{
+	struct cdns3_device *priv_dev = container_of(dev,
+			struct cdns3_device, gadget.dev);
+
+	kfree(priv_dev);
+}
+
+static void cdns3_gadget_exit(struct cdns *cdns)
+{
+	struct cdns3_device *priv_dev;
+
+	priv_dev = cdns->gadget_dev;
+
+
+	pm_runtime_mark_last_busy(cdns->dev);
+	pm_runtime_put_autosuspend(cdns->dev);
+
+	usb_del_gadget(&priv_dev->gadget);
+	devm_free_irq(cdns->dev, cdns->dev_irq, priv_dev);
+
+	cdns3_free_all_eps(priv_dev);
+
+	while (!list_empty(&priv_dev->aligned_buf_list)) {
+		struct cdns3_aligned_buf *buf;
+
+		buf = cdns3_next_align_buf(&priv_dev->aligned_buf_list);
+		dma_free_noncoherent(priv_dev->sysdev, buf->size,
+				  buf->buf,
+				  buf->dma,
+				  buf->dir);
+
+		list_del(&buf->list);
+		kfree(buf);
+	}
+
+	dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
+			  priv_dev->setup_dma);
+	dma_pool_destroy(priv_dev->eps_dma_pool);
+
+	kfree(priv_dev->zlp_buf);
+	usb_put_gadget(&priv_dev->gadget);
+	cdns->gadget_dev = NULL;
+	cdns_drd_gadget_off(cdns);
+}
+
+static int cdns3_gadget_start(struct cdns *cdns)
+{
+	struct cdns3_device *priv_dev;
+	u32 max_speed;
+	int ret;
+
+	priv_dev = kzalloc(sizeof(*priv_dev), GFP_KERNEL);
+	if (!priv_dev)
+		return -ENOMEM;
+
+	usb_initialize_gadget(cdns->dev, &priv_dev->gadget,
+			cdns3_gadget_release);
+	cdns->gadget_dev = priv_dev;
+	priv_dev->sysdev = cdns->dev;
+	priv_dev->dev = cdns->dev;
+	priv_dev->regs = cdns->dev_regs;
+
+	device_property_read_u16(priv_dev->dev, "cdns,on-chip-buff-size",
+				 &priv_dev->onchip_buffers);
+
+	if (priv_dev->onchip_buffers <=  0) {
+		u32 reg = readl(&priv_dev->regs->usb_cap2);
+
+		priv_dev->onchip_buffers = USB_CAP2_ACTUAL_MEM_SIZE(reg);
+	}
+
+	if (!priv_dev->onchip_buffers)
+		priv_dev->onchip_buffers = 256;
+
+	max_speed = usb_get_maximum_speed(cdns->dev);
+
+	/* Check the maximum_speed parameter */
+	switch (max_speed) {
+	case USB_SPEED_FULL:
+	case USB_SPEED_HIGH:
+	case USB_SPEED_SUPER:
+		break;
+	default:
+		dev_err(cdns->dev, "invalid maximum_speed parameter %d\n",
+			max_speed);
+		fallthrough;
+	case USB_SPEED_UNKNOWN:
+		/* default to superspeed */
+		max_speed = USB_SPEED_SUPER;
+		break;
+	}
+
+	/* fill gadget fields */
+	priv_dev->gadget.max_speed = max_speed;
+	priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+	priv_dev->gadget.ops = &cdns3_gadget_ops;
+	priv_dev->gadget.name = "usb-ss-gadget";
+	priv_dev->gadget.quirk_avoids_skb_reserve = 1;
+	priv_dev->gadget.irq = cdns->dev_irq;
+
+	spin_lock_init(&priv_dev->lock);
+	INIT_WORK(&priv_dev->pending_status_wq,
+		  cdns3_pending_setup_status_handler);
+
+	INIT_WORK(&priv_dev->aligned_buf_wq,
+		  cdns3_free_aligned_request_buf);
+
+	/* initialize endpoint container */
+	INIT_LIST_HEAD(&priv_dev->gadget.ep_list);
+	INIT_LIST_HEAD(&priv_dev->aligned_buf_list);
+	priv_dev->eps_dma_pool = dma_pool_create("cdns3_eps_dma_pool",
+						 priv_dev->sysdev,
+						 TRB_RING_SIZE, 8, 0);
+	if (!priv_dev->eps_dma_pool) {
+		dev_err(priv_dev->dev, "Failed to create TRB dma pool\n");
+		ret = -ENOMEM;
+		goto err1;
+	}
+
+	ret = cdns3_init_eps(priv_dev);
+	if (ret) {
+		dev_err(priv_dev->dev, "Failed to create endpoints\n");
+		goto err1;
+	}
+
+	/* allocate memory for setup packet buffer */
+	priv_dev->setup_buf = dma_alloc_coherent(priv_dev->sysdev, 8,
+						 &priv_dev->setup_dma, GFP_DMA);
+	if (!priv_dev->setup_buf) {
+		ret = -ENOMEM;
+		goto err2;
+	}
+
+	priv_dev->dev_ver = readl(&priv_dev->regs->usb_cap6);
+
+	dev_dbg(priv_dev->dev, "Device Controller version: %08x\n",
+		readl(&priv_dev->regs->usb_cap6));
+	dev_dbg(priv_dev->dev, "USB Capabilities:: %08x\n",
+		readl(&priv_dev->regs->usb_cap1));
+	dev_dbg(priv_dev->dev, "On-Chip memory configuration: %08x\n",
+		readl(&priv_dev->regs->usb_cap2));
+
+	priv_dev->dev_ver = GET_DEV_BASE_VERSION(priv_dev->dev_ver);
+	if (priv_dev->dev_ver >= DEV_VER_V2)
+		priv_dev->gadget.sg_supported = 1;
+
+	priv_dev->zlp_buf = kzalloc(CDNS3_EP_ZLP_BUF_SIZE, GFP_KERNEL);
+	if (!priv_dev->zlp_buf) {
+		ret = -ENOMEM;
+		goto err3;
+	}
+
+	/* add USB gadget device */
+	ret = usb_add_gadget(&priv_dev->gadget);
+	if (ret < 0) {
+		dev_err(priv_dev->dev, "Failed to add gadget\n");
+		goto err4;
+	}
+
+	return 0;
+err4:
+	kfree(priv_dev->zlp_buf);
+err3:
+	dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
+			  priv_dev->setup_dma);
+err2:
+	cdns3_free_all_eps(priv_dev);
+err1:
+	dma_pool_destroy(priv_dev->eps_dma_pool);
+
+	usb_put_gadget(&priv_dev->gadget);
+	cdns->gadget_dev = NULL;
+	return ret;
+}
+
+static int __cdns3_gadget_init(struct cdns *cdns)
+{
+	int ret = 0;
+
+	/* Ensure 32-bit DMA Mask in case we switched back from Host mode */
+	ret = dma_set_mask_and_coherent(cdns->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(cdns->dev, "Failed to set dma mask: %d\n", ret);
+		return ret;
+	}
+
+	cdns_drd_gadget_on(cdns);
+	pm_runtime_get_sync(cdns->dev);
+
+	ret = cdns3_gadget_start(cdns);
+	if (ret) {
+		pm_runtime_put_sync(cdns->dev);
+		return ret;
+	}
+
+	/*
+	 * Because interrupt line can be shared with other components in
+	 * driver it can't use IRQF_ONESHOT flag here.
+	 */
+	ret = devm_request_threaded_irq(cdns->dev, cdns->dev_irq,
+					cdns3_device_irq_handler,
+					cdns3_device_thread_irq_handler,
+					IRQF_SHARED, dev_name(cdns->dev),
+					cdns->gadget_dev);
+
+	if (ret)
+		goto err0;
+
+	return 0;
+err0:
+	cdns3_gadget_exit(cdns);
+	return ret;
+}
+
+static int cdns3_gadget_suspend(struct cdns *cdns, bool do_wakeup)
+__must_hold(&cdns->lock)
+{
+	struct cdns3_device *priv_dev = cdns->gadget_dev;
+
+	spin_unlock(&cdns->lock);
+	cdns3_disconnect_gadget(priv_dev);
+	spin_lock(&cdns->lock);
+
+	priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+	usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);
+	cdns3_hw_reset_eps_config(priv_dev);
+
+	/* disable interrupt for device */
+	writel(0, &priv_dev->regs->usb_ien);
+
+	return 0;
+}
+
+static int cdns3_gadget_resume(struct cdns *cdns, bool hibernated)
+{
+	struct cdns3_device *priv_dev = cdns->gadget_dev;
+
+	if (!priv_dev->gadget_driver)
+		return 0;
+
+	cdns3_gadget_config(priv_dev);
+	if (hibernated)
+		writel(USB_CONF_DEVEN, &priv_dev->regs->usb_conf);
+
+	return 0;
+}
+
+/**
+ * cdns3_gadget_init - initialize device structure
+ *
+ * @cdns: cdns instance
+ *
+ * This function initializes the gadget.
+ */
+int cdns3_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	= __cdns3_gadget_init;
+	rdrv->stop	= cdns3_gadget_exit;
+	rdrv->suspend	= cdns3_gadget_suspend;
+	rdrv->resume	= cdns3_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/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
new file mode 100644
index 0000000000..086a7bb838
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-gadget.h
@@ -0,0 +1,1377 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * USBSS device controller driver header file
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *         Pawel Jez <pjez@cadence.com>
+ *         Peter Chen <peter.chen@nxp.com>
+ */
+#ifndef __LINUX_CDNS3_GADGET
+#define __LINUX_CDNS3_GADGET
+#include <linux/usb/gadget.h>
+#include <linux/dma-direction.h>
+
+/*
+ * USBSS-DEV register interface.
+ * This corresponds to the USBSS Device Controller Interface
+ */
+
+/**
+ * struct cdns3_usb_regs - device controller registers.
+ * @usb_conf:      Global Configuration.
+ * @usb_sts:       Global Status.
+ * @usb_cmd:       Global Command.
+ * @usb_itpn:      ITP/SOF number.
+ * @usb_lpm:       Global Command.
+ * @usb_ien:       USB Interrupt Enable.
+ * @usb_ists:      USB Interrupt Status.
+ * @ep_sel:        Endpoint Select.
+ * @ep_traddr:     Endpoint Transfer Ring Address.
+ * @ep_cfg:        Endpoint Configuration.
+ * @ep_cmd:        Endpoint Command.
+ * @ep_sts:        Endpoint Status.
+ * @ep_sts_sid:    Endpoint Status.
+ * @ep_sts_en:     Endpoint Status Enable.
+ * @drbl:          Doorbell.
+ * @ep_ien:        EP Interrupt Enable.
+ * @ep_ists:       EP Interrupt Status.
+ * @usb_pwr:       Global Power Configuration.
+ * @usb_conf2:     Global Configuration 2.
+ * @usb_cap1:      Capability 1.
+ * @usb_cap2:      Capability 2.
+ * @usb_cap3:      Capability 3.
+ * @usb_cap4:      Capability 4.
+ * @usb_cap5:      Capability 5.
+ * @usb_cap6:      Capability 6.
+ * @usb_cpkt1:     Custom Packet 1.
+ * @usb_cpkt2:     Custom Packet 2.
+ * @usb_cpkt3:     Custom Packet 3.
+ * @ep_dma_ext_addr: Upper address for DMA operations.
+ * @buf_addr:      Address for On-chip Buffer operations.
+ * @buf_data:      Data for On-chip Buffer operations.
+ * @buf_ctrl:      On-chip Buffer Access Control.
+ * @dtrans:        DMA Transfer Mode.
+ * @tdl_from_trb:  Source of TD Configuration.
+ * @tdl_beh:       TDL Behavior Configuration.
+ * @ep_tdl:        Endpoint TDL.
+ * @tdl_beh2:      TDL Behavior 2 Configuration.
+ * @dma_adv_td:    DMA Advance TD Configuration.
+ * @reserved1:     Reserved.
+ * @cfg_regs:      Configuration.
+ * @reserved2:     Reserved.
+ * @dma_axi_ctrl:  AXI Control.
+ * @dma_axi_id:    AXI ID register.
+ * @dma_axi_cap:   AXI Capability.
+ * @dma_axi_ctrl0: AXI Control 0.
+ * @dma_axi_ctrl1: AXI Control 1.
+ */
+struct cdns3_usb_regs {
+	__le32 usb_conf;
+	__le32 usb_sts;
+	__le32 usb_cmd;
+	__le32 usb_itpn;
+	__le32 usb_lpm;
+	__le32 usb_ien;
+	__le32 usb_ists;
+	__le32 ep_sel;
+	__le32 ep_traddr;
+	__le32 ep_cfg;
+	__le32 ep_cmd;
+	__le32 ep_sts;
+	__le32 ep_sts_sid;
+	__le32 ep_sts_en;
+	__le32 drbl;
+	__le32 ep_ien;
+	__le32 ep_ists;
+	__le32 usb_pwr;
+	__le32 usb_conf2;
+	__le32 usb_cap1;
+	__le32 usb_cap2;
+	__le32 usb_cap3;
+	__le32 usb_cap4;
+	__le32 usb_cap5;
+	__le32 usb_cap6;
+	__le32 usb_cpkt1;
+	__le32 usb_cpkt2;
+	__le32 usb_cpkt3;
+	__le32 ep_dma_ext_addr;
+	__le32 buf_addr;
+	__le32 buf_data;
+	__le32 buf_ctrl;
+	__le32 dtrans;
+	__le32 tdl_from_trb;
+	__le32 tdl_beh;
+	__le32 ep_tdl;
+	__le32 tdl_beh2;
+	__le32 dma_adv_td;
+	__le32 reserved1[26];
+	__le32 cfg_reg1;
+	__le32 dbg_link1;
+	__le32 dbg_link2;
+	__le32 cfg_regs[74];
+	__le32 reserved2[51];
+	__le32 dma_axi_ctrl;
+	__le32 dma_axi_id;
+	__le32 dma_axi_cap;
+	__le32 dma_axi_ctrl0;
+	__le32 dma_axi_ctrl1;
+};
+
+/* USB_CONF - bitmasks */
+/* Reset USB device configuration. */
+#define USB_CONF_CFGRST		BIT(0)
+/* Set Configuration. */
+#define USB_CONF_CFGSET		BIT(1)
+/* Disconnect USB device in SuperSpeed. */
+#define USB_CONF_USB3DIS	BIT(3)
+/* Disconnect USB device in HS/FS */
+#define USB_CONF_USB2DIS	BIT(4)
+/* Little Endian access - default */
+#define USB_CONF_LENDIAN	BIT(5)
+/*
+ * Big Endian access. Driver assume that byte order for
+ * SFRs access always is as Little Endian so this bit
+ * is not used.
+ */
+#define USB_CONF_BENDIAN	BIT(6)
+/* Device software reset. */
+#define USB_CONF_SWRST		BIT(7)
+/* Singular DMA transfer mode. Only for VER < DEV_VER_V3*/
+#define USB_CONF_DSING		BIT(8)
+/* Multiple DMA transfers mode. Only for VER < DEV_VER_V3 */
+#define USB_CONF_DMULT		BIT(9)
+/* DMA clock turn-off enable. */
+#define USB_CONF_DMAOFFEN	BIT(10)
+/* DMA clock turn-off disable. */
+#define USB_CONF_DMAOFFDS	BIT(11)
+/* Clear Force Full Speed. */
+#define USB_CONF_CFORCE_FS	BIT(12)
+/* Set Force Full Speed. */
+#define USB_CONF_SFORCE_FS	BIT(13)
+/* Device enable. */
+#define USB_CONF_DEVEN		BIT(14)
+/* Device disable. */
+#define USB_CONF_DEVDS		BIT(15)
+/* L1 LPM state entry enable (used in HS/FS mode). */
+#define USB_CONF_L1EN		BIT(16)
+/* L1 LPM state entry disable (used in HS/FS mode). */
+#define USB_CONF_L1DS		BIT(17)
+/* USB 2.0 clock gate disable. */
+#define USB_CONF_CLK2OFFEN	BIT(18)
+/* USB 2.0 clock gate enable. */
+#define USB_CONF_CLK2OFFDS	BIT(19)
+/* L0 LPM state entry request (used in HS/FS mode). */
+#define USB_CONF_LGO_L0		BIT(20)
+/* USB 3.0 clock gate disable. */
+#define USB_CONF_CLK3OFFEN	BIT(21)
+/* USB 3.0 clock gate enable. */
+#define USB_CONF_CLK3OFFDS	BIT(22)
+/* Bit 23 is reserved*/
+/* U1 state entry enable (used in SS mode). */
+#define USB_CONF_U1EN		BIT(24)
+/* U1 state entry disable (used in SS mode). */
+#define USB_CONF_U1DS		BIT(25)
+/* U2 state entry enable (used in SS mode). */
+#define USB_CONF_U2EN		BIT(26)
+/* U2 state entry disable (used in SS mode). */
+#define USB_CONF_U2DS		BIT(27)
+/* U0 state entry request (used in SS mode). */
+#define USB_CONF_LGO_U0		BIT(28)
+/* U1 state entry request (used in SS mode). */
+#define USB_CONF_LGO_U1		BIT(29)
+/* U2 state entry request (used in SS mode). */
+#define USB_CONF_LGO_U2		BIT(30)
+/* SS.Inactive state entry request (used in SS mode) */
+#define USB_CONF_LGO_SSINACT	BIT(31)
+
+/* USB_STS - bitmasks */
+/*
+ * Configuration status.
+ * 1 - device is in the configured state.
+ * 0 - device is not configured.
+ */
+#define USB_STS_CFGSTS_MASK	BIT(0)
+#define USB_STS_CFGSTS(p)	((p) & USB_STS_CFGSTS_MASK)
+/*
+ * On-chip memory overflow.
+ * 0 - On-chip memory status OK.
+ * 1 - On-chip memory overflow.
+ */
+#define USB_STS_OV_MASK		BIT(1)
+#define USB_STS_OV(p)		((p) & USB_STS_OV_MASK)
+/*
+ * SuperSpeed connection status.
+ * 0 - USB in SuperSpeed mode disconnected.
+ * 1 - USB in SuperSpeed mode connected.
+ */
+#define USB_STS_USB3CONS_MASK	BIT(2)
+#define USB_STS_USB3CONS(p)	((p) & USB_STS_USB3CONS_MASK)
+/*
+ * DMA transfer configuration status.
+ * 0 - single request.
+ * 1 - multiple TRB chain
+ * Supported only for controller version <  DEV_VER_V3
+ */
+#define USB_STS_DTRANS_MASK	BIT(3)
+#define USB_STS_DTRANS(p)	((p) & USB_STS_DTRANS_MASK)
+/*
+ * Device speed.
+ * 0 - Undefined (value after reset).
+ * 1 - Low speed
+ * 2 - Full speed
+ * 3 - High speed
+ * 4 - Super speed
+ */
+#define USB_STS_USBSPEED_MASK	GENMASK(6, 4)
+#define USB_STS_USBSPEED(p)	(((p) & USB_STS_USBSPEED_MASK) >> 4)
+#define USB_STS_LS		(0x1 << 4)
+#define USB_STS_FS		(0x2 << 4)
+#define USB_STS_HS		(0x3 << 4)
+#define USB_STS_SS		(0x4 << 4)
+#define DEV_UNDEFSPEED(p)	(((p) & USB_STS_USBSPEED_MASK) == (0x0 << 4))
+#define DEV_LOWSPEED(p)		(((p) & USB_STS_USBSPEED_MASK) == USB_STS_LS)
+#define DEV_FULLSPEED(p)	(((p) & USB_STS_USBSPEED_MASK) == USB_STS_FS)
+#define DEV_HIGHSPEED(p)	(((p) & USB_STS_USBSPEED_MASK) == USB_STS_HS)
+#define DEV_SUPERSPEED(p)	(((p) & USB_STS_USBSPEED_MASK) == USB_STS_SS)
+/*
+ * Endianness for SFR access.
+ * 0 - Little Endian order (default after hardware reset).
+ * 1 - Big Endian order
+ */
+#define USB_STS_ENDIAN_MASK	BIT(7)
+#define USB_STS_ENDIAN(p)	((p) & USB_STS_ENDIAN_MASK)
+/*
+ * HS/FS clock turn-off status.
+ * 0 - hsfs clock is always on.
+ * 1 - hsfs clock turn-off in L2 (HS/FS mode) is enabled
+ *          (default after hardware reset).
+ */
+#define USB_STS_CLK2OFF_MASK	BIT(8)
+#define USB_STS_CLK2OFF(p)	((p) & USB_STS_CLK2OFF_MASK)
+/*
+ * PCLK clock turn-off status.
+ * 0 - pclk clock is always on.
+ * 1 - pclk clock turn-off in U3 (SS mode) is enabled
+ *          (default after hardware reset).
+ */
+#define USB_STS_CLK3OFF_MASK	BIT(9)
+#define USB_STS_CLK3OFF(p)	((p) & USB_STS_CLK3OFF_MASK)
+/*
+ * Controller in reset state.
+ * 0 - Internal reset is active.
+ * 1 - Internal reset is not active and controller is fully operational.
+ */
+#define USB_STS_IN_RST_MASK	BIT(10)
+#define USB_STS_IN_RST(p)	((p) & USB_STS_IN_RST_MASK)
+/*
+ * Status of the "TDL calculation basing on TRB" feature.
+ * 0 - disabled
+ * 1 - enabled
+ * Supported only for DEV_VER_V2 controller version.
+ */
+#define USB_STS_TDL_TRB_ENABLED	BIT(11)
+/*
+ * Device enable Status.
+ * 0 - USB device is disabled (VBUS input is disconnected from internal logic).
+ * 1 - USB device is enabled (VBUS input is connected to the internal logic).
+ */
+#define USB_STS_DEVS_MASK	BIT(14)
+#define USB_STS_DEVS(p)		((p) & USB_STS_DEVS_MASK)
+/*
+ * Address status.
+ * 0 - USB device is default state.
+ * 1 - USB device is at least in address state.
+ */
+#define USB_STS_ADDRESSED_MASK	BIT(15)
+#define USB_STS_ADDRESSED(p)	((p) & USB_STS_ADDRESSED_MASK)
+/*
+ * L1 LPM state enable status (used in HS/FS mode).
+ * 0 - Entering to L1 LPM state disabled.
+ * 1 - Entering to L1 LPM state enabled.
+ */
+#define USB_STS_L1ENS_MASK	BIT(16)
+#define USB_STS_L1ENS(p)	((p) & USB_STS_L1ENS_MASK)
+/*
+ * Internal VBUS connection status (used both in HS/FS  and SS mode).
+ * 0 - internal VBUS is not detected.
+ * 1 - internal VBUS is detected.
+ */
+#define USB_STS_VBUSS_MASK	BIT(17)
+#define USB_STS_VBUSS(p)	((p) & USB_STS_VBUSS_MASK)
+/*
+ * HS/FS LPM  state (used in FS/HS mode).
+ * 0 - L0 State
+ * 1 - L1 State
+ * 2 - L2 State
+ * 3 - L3 State
+ */
+#define USB_STS_LPMST_MASK	GENMASK(19, 18)
+#define DEV_L0_STATE(p)		(((p) & USB_STS_LPMST_MASK) == (0x0 << 18))
+#define DEV_L1_STATE(p)		(((p) & USB_STS_LPMST_MASK) == (0x1 << 18))
+#define DEV_L2_STATE(p)		(((p) & USB_STS_LPMST_MASK) == (0x2 << 18))
+#define DEV_L3_STATE(p)		(((p) & USB_STS_LPMST_MASK) == (0x3 << 18))
+/*
+ * Disable HS status (used in FS/HS mode).
+ * 0 - the disconnect bit for HS/FS mode is set .
+ * 1 - the disconnect bit for HS/FS mode is not set.
+ */
+#define USB_STS_USB2CONS_MASK	BIT(20)
+#define USB_STS_USB2CONS(p)	((p) & USB_STS_USB2CONS_MASK)
+/*
+ * HS/FS mode connection status (used in FS/HS mode).
+ * 0 - High Speed operations in USB2.0 (FS/HS) mode not disabled.
+ * 1 - High Speed operations in USB2.0 (FS/HS).
+ */
+#define USB_STS_DISABLE_HS_MASK	BIT(21)
+#define USB_STS_DISABLE_HS(p)	((p) & USB_STS_DISABLE_HS_MASK)
+/*
+ * U1 state enable status (used in SS mode).
+ * 0 - Entering to  U1 state disabled.
+ * 1 - Entering to  U1 state enabled.
+ */
+#define USB_STS_U1ENS_MASK	BIT(24)
+#define USB_STS_U1ENS(p)	((p) & USB_STS_U1ENS_MASK)
+/*
+ * U2 state enable status (used in SS mode).
+ * 0 - Entering to  U2 state disabled.
+ * 1 - Entering to  U2 state enabled.
+ */
+#define USB_STS_U2ENS_MASK	BIT(25)
+#define USB_STS_U2ENS(p)	((p) & USB_STS_U2ENS_MASK)
+/*
+ * SuperSpeed Link LTSSM state. This field reflects USBSS-DEV current
+ * SuperSpeed link state
+ */
+#define USB_STS_LST_MASK	GENMASK(29, 26)
+#define DEV_LST_U0		(((p) & USB_STS_LST_MASK) == (0x0 << 26))
+#define DEV_LST_U1		(((p) & USB_STS_LST_MASK) == (0x1 << 26))
+#define DEV_LST_U2		(((p) & USB_STS_LST_MASK) == (0x2 << 26))
+#define DEV_LST_U3		(((p) & USB_STS_LST_MASK) == (0x3 << 26))
+#define DEV_LST_DISABLED	(((p) & USB_STS_LST_MASK) == (0x4 << 26))
+#define DEV_LST_RXDETECT	(((p) & USB_STS_LST_MASK) == (0x5 << 26))
+#define DEV_LST_INACTIVE	(((p) & USB_STS_LST_MASK) == (0x6 << 26))
+#define DEV_LST_POLLING		(((p) & USB_STS_LST_MASK) == (0x7 << 26))
+#define DEV_LST_RECOVERY	(((p) & USB_STS_LST_MASK) == (0x8 << 26))
+#define DEV_LST_HOT_RESET	(((p) & USB_STS_LST_MASK) == (0x9 << 26))
+#define DEV_LST_COMP_MODE	(((p) & USB_STS_LST_MASK) == (0xa << 26))
+#define DEV_LST_LB_STATE	(((p) & USB_STS_LST_MASK) == (0xb << 26))
+/*
+ * DMA clock turn-off status.
+ * 0 - DMA clock is always on (default after hardware reset).
+ * 1 - DMA clock turn-off in U1, U2 and U3 (SS mode) is enabled.
+ */
+#define USB_STS_DMAOFF_MASK	BIT(30)
+#define USB_STS_DMAOFF(p)	((p) & USB_STS_DMAOFF_MASK)
+/*
+ * SFR Endian status.
+ * 0 - Little Endian order (default after hardware reset).
+ * 1 - Big Endian order.
+ */
+#define USB_STS_ENDIAN2_MASK	BIT(31)
+#define USB_STS_ENDIAN2(p)	((p) & USB_STS_ENDIAN2_MASK)
+
+/* USB_CMD -  bitmasks */
+/* Set Function Address */
+#define USB_CMD_SET_ADDR	BIT(0)
+/*
+ * Function Address This field is saved to the device only when the field
+ * SET_ADDR is set '1 ' during write to USB_CMD register.
+ * Software is responsible for entering the address of the device during
+ * SET_ADDRESS request service. This field should be set immediately after
+ * the SETUP packet is decoded, and prior to confirmation of the status phase
+ */
+#define USB_CMD_FADDR_MASK	GENMASK(7, 1)
+#define USB_CMD_FADDR(p)	(((p) << 1) & USB_CMD_FADDR_MASK)
+/* Send Function Wake Device Notification TP (used only in SS mode). */
+#define USB_CMD_SDNFW		BIT(8)
+/* Set Test Mode (used only in HS/FS mode). */
+#define USB_CMD_STMODE		BIT(9)
+/* Test mode selector (used only in HS/FS mode) */
+#define USB_STS_TMODE_SEL_MASK	GENMASK(11, 10)
+#define USB_STS_TMODE_SEL(p)	(((p) << 10) & USB_STS_TMODE_SEL_MASK)
+/*
+ *  Send Latency Tolerance Message Device Notification TP (used only
+ *  in SS mode).
+ */
+#define USB_CMD_SDNLTM		BIT(12)
+/* Send Custom Transaction Packet (used only in SS mode) */
+#define USB_CMD_SPKT		BIT(13)
+/*Device Notification 'Function Wake' - Interface value (only in SS mode. */
+#define USB_CMD_DNFW_INT_MASK	GENMASK(23, 16)
+#define USB_STS_DNFW_INT(p)	(((p) << 16) & USB_CMD_DNFW_INT_MASK)
+/*
+ * Device Notification 'Latency Tolerance Message' -373 BELT value [7:0]
+ * (used only in SS mode).
+ */
+#define USB_CMD_DNLTM_BELT_MASK	GENMASK(27, 16)
+#define USB_STS_DNLTM_BELT(p)	(((p) << 16) & USB_CMD_DNLTM_BELT_MASK)
+
+/* USB_ITPN - bitmasks */
+/*
+ * ITP(SS) / SOF (HS/FS) number
+ * In SS mode this field represent number of last ITP received from host.
+ * In HS/FS mode this field represent number of last SOF received from host.
+ */
+#define USB_ITPN_MASK		GENMASK(13, 0)
+#define USB_ITPN(p)		((p) & USB_ITPN_MASK)
+
+/* USB_LPM - bitmasks */
+/* Host Initiated Resume Duration. */
+#define USB_LPM_HIRD_MASK	GENMASK(3, 0)
+#define USB_LPM_HIRD(p)		((p) & USB_LPM_HIRD_MASK)
+/* Remote Wakeup Enable (bRemoteWake). */
+#define USB_LPM_BRW		BIT(4)
+
+/* USB_IEN - bitmasks */
+/* SS connection interrupt enable */
+#define USB_IEN_CONIEN		BIT(0)
+/* SS disconnection interrupt enable. */
+#define USB_IEN_DISIEN		BIT(1)
+/* USB SS warm reset interrupt enable. */
+#define USB_IEN_UWRESIEN	BIT(2)
+/* USB SS hot reset interrupt enable */
+#define USB_IEN_UHRESIEN	BIT(3)
+/* SS link U3 state enter interrupt enable (suspend).*/
+#define USB_IEN_U3ENTIEN	BIT(4)
+/* SS link U3 state exit interrupt enable (wakeup). */
+#define USB_IEN_U3EXTIEN	BIT(5)
+/* SS link U2 state enter interrupt enable.*/
+#define USB_IEN_U2ENTIEN	BIT(6)
+/* SS link U2 state exit interrupt enable.*/
+#define USB_IEN_U2EXTIEN	BIT(7)
+/* SS link U1 state enter interrupt enable.*/
+#define USB_IEN_U1ENTIEN	BIT(8)
+/* SS link U1 state exit interrupt enable.*/
+#define USB_IEN_U1EXTIEN	BIT(9)
+/* ITP/SOF packet detected interrupt enable.*/
+#define USB_IEN_ITPIEN		BIT(10)
+/* Wakeup interrupt enable.*/
+#define USB_IEN_WAKEIEN		BIT(11)
+/* Send Custom Packet interrupt enable.*/
+#define USB_IEN_SPKTIEN		BIT(12)
+/* HS/FS mode connection interrupt enable.*/
+#define USB_IEN_CON2IEN		BIT(16)
+/* HS/FS mode disconnection interrupt enable.*/
+#define USB_IEN_DIS2IEN		BIT(17)
+/* USB reset (HS/FS mode) interrupt enable.*/
+#define USB_IEN_U2RESIEN	BIT(18)
+/* LPM L2 state enter interrupt enable.*/
+#define USB_IEN_L2ENTIEN	BIT(20)
+/* LPM  L2 state exit interrupt enable.*/
+#define USB_IEN_L2EXTIEN	BIT(21)
+/* LPM L1 state enter interrupt enable.*/
+#define USB_IEN_L1ENTIEN	BIT(24)
+/* LPM  L1 state exit interrupt enable.*/
+#define USB_IEN_L1EXTIEN	BIT(25)
+/* Configuration reset interrupt enable.*/
+#define USB_IEN_CFGRESIEN	BIT(26)
+/* Start of the USB SS warm reset interrupt enable.*/
+#define USB_IEN_UWRESSIEN	BIT(28)
+/* End of the USB SS warm reset interrupt enable.*/
+#define USB_IEN_UWRESEIEN	BIT(29)
+
+#define USB_IEN_INIT  (USB_IEN_U2RESIEN | USB_ISTS_DIS2I | USB_IEN_CON2IEN \
+		       | USB_IEN_UHRESIEN | USB_IEN_UWRESIEN | USB_IEN_DISIEN \
+		       | USB_IEN_CONIEN | USB_IEN_U3EXTIEN | USB_IEN_L2ENTIEN \
+		       | USB_IEN_L2EXTIEN | USB_IEN_L1ENTIEN | USB_IEN_U3ENTIEN)
+
+/* USB_ISTS - bitmasks */
+/* SS Connection detected. */
+#define USB_ISTS_CONI		BIT(0)
+/* SS Disconnection detected. */
+#define USB_ISTS_DISI		BIT(1)
+/* UUSB warm reset detectede. */
+#define USB_ISTS_UWRESI		BIT(2)
+/* USB hot reset detected. */
+#define USB_ISTS_UHRESI		BIT(3)
+/* U3 link state enter detected (suspend).*/
+#define USB_ISTS_U3ENTI		BIT(4)
+/* U3 link state exit detected (wakeup). */
+#define USB_ISTS_U3EXTI		BIT(5)
+/* U2 link state enter detected.*/
+#define USB_ISTS_U2ENTI		BIT(6)
+/* U2 link state exit detected.*/
+#define USB_ISTS_U2EXTI		BIT(7)
+/* U1 link state enter detected.*/
+#define USB_ISTS_U1ENTI		BIT(8)
+/* U1 link state exit detected.*/
+#define USB_ISTS_U1EXTI		BIT(9)
+/* ITP/SOF packet detected.*/
+#define USB_ISTS_ITPI		BIT(10)
+/* Wakeup detected.*/
+#define USB_ISTS_WAKEI		BIT(11)
+/* Send Custom Packet detected.*/
+#define USB_ISTS_SPKTI		BIT(12)
+/* HS/FS mode connection detected.*/
+#define USB_ISTS_CON2I		BIT(16)
+/* HS/FS mode disconnection detected.*/
+#define USB_ISTS_DIS2I		BIT(17)
+/* USB reset (HS/FS mode) detected.*/
+#define USB_ISTS_U2RESI		BIT(18)
+/* LPM L2 state enter detected.*/
+#define USB_ISTS_L2ENTI		BIT(20)
+/* LPM  L2 state exit detected.*/
+#define USB_ISTS_L2EXTI		BIT(21)
+/* LPM L1 state enter detected.*/
+#define USB_ISTS_L1ENTI		BIT(24)
+/* LPM L1 state exit detected.*/
+#define USB_ISTS_L1EXTI		BIT(25)
+/* USB configuration reset detected.*/
+#define USB_ISTS_CFGRESI	BIT(26)
+/* Start of the USB warm reset detected.*/
+#define USB_ISTS_UWRESSI	BIT(28)
+/* End of the USB warm reset detected.*/
+#define USB_ISTS_UWRESEI	BIT(29)
+
+/* USB_SEL - bitmasks */
+#define EP_SEL_EPNO_MASK	GENMASK(3, 0)
+/* Endpoint number. */
+#define EP_SEL_EPNO(p)		((p) & EP_SEL_EPNO_MASK)
+/* Endpoint direction bit - 0 - OUT, 1 - IN. */
+#define EP_SEL_DIR		BIT(7)
+
+#define select_ep_in(nr)	(EP_SEL_EPNO(p) | EP_SEL_DIR)
+#define select_ep_out		(EP_SEL_EPNO(p))
+
+/* EP_TRADDR - bitmasks */
+/* Transfer Ring address. */
+#define EP_TRADDR_TRADDR(p)	((p))
+
+/* EP_CFG - bitmasks */
+/* Endpoint enable */
+#define EP_CFG_ENABLE		BIT(0)
+/*
+ *  Endpoint type.
+ * 1 - isochronous
+ * 2 - bulk
+ * 3 - interrupt
+ */
+#define EP_CFG_EPTYPE_MASK	GENMASK(2, 1)
+#define EP_CFG_EPTYPE(p)	(((p) << 1)  & EP_CFG_EPTYPE_MASK)
+/* Stream support enable (only in SS mode). */
+#define EP_CFG_STREAM_EN	BIT(3)
+/* TDL check (only in SS mode for BULK EP). */
+#define EP_CFG_TDL_CHK		BIT(4)
+/* SID check (only in SS mode for BULK OUT EP). */
+#define EP_CFG_SID_CHK		BIT(5)
+/* DMA transfer endianness. */
+#define EP_CFG_EPENDIAN		BIT(7)
+/* Max burst size (used only in SS mode). */
+#define EP_CFG_MAXBURST_MASK	GENMASK(11, 8)
+#define EP_CFG_MAXBURST(p)	(((p) << 8) & EP_CFG_MAXBURST_MASK)
+#define EP_CFG_MAXBURST_MAX	15
+/* ISO max burst. */
+#define EP_CFG_MULT_MASK	GENMASK(15, 14)
+#define EP_CFG_MULT(p)		(((p) << 14) & EP_CFG_MULT_MASK)
+#define EP_CFG_MULT_MAX		2
+/* ISO max burst. */
+#define EP_CFG_MAXPKTSIZE_MASK	GENMASK(26, 16)
+#define EP_CFG_MAXPKTSIZE(p)	(((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
+/* Max number of buffered packets. */
+#define EP_CFG_BUFFERING_MASK	GENMASK(31, 27)
+#define EP_CFG_BUFFERING(p)	(((p) << 27) & EP_CFG_BUFFERING_MASK)
+#define EP_CFG_BUFFERING_MAX	15
+
+/* EP_CMD - bitmasks */
+/* Endpoint reset. */
+#define EP_CMD_EPRST		BIT(0)
+/* Endpoint STALL set. */
+#define EP_CMD_SSTALL		BIT(1)
+/* Endpoint STALL clear. */
+#define EP_CMD_CSTALL		BIT(2)
+/* Send ERDY TP. */
+#define EP_CMD_ERDY		BIT(3)
+/* Request complete. */
+#define EP_CMD_REQ_CMPL		BIT(5)
+/* Transfer descriptor ready. */
+#define EP_CMD_DRDY		BIT(6)
+/* Data flush. */
+#define EP_CMD_DFLUSH		BIT(7)
+/*
+ * Transfer Descriptor Length write  (used only for Bulk Stream capable
+ * endpoints in SS mode).
+ * Bit Removed from DEV_VER_V3 controller version.
+ */
+#define EP_CMD_STDL		BIT(8)
+/*
+ * Transfer Descriptor Length (used only in SS mode for bulk endpoints).
+ * Bits Removed from DEV_VER_V3 controller version.
+ */
+#define EP_CMD_TDL_MASK		GENMASK(15, 9)
+#define EP_CMD_TDL_SET(p)	(((p) << 9) & EP_CMD_TDL_MASK)
+#define EP_CMD_TDL_GET(p)	(((p) & EP_CMD_TDL_MASK) >> 9)
+#define EP_CMD_TDL_MAX		(EP_CMD_TDL_MASK >> 9)
+
+/* ERDY Stream ID value (used in SS mode). */
+#define EP_CMD_ERDY_SID_MASK	GENMASK(31, 16)
+#define EP_CMD_ERDY_SID(p)	(((p) << 16) & EP_CMD_ERDY_SID_MASK)
+
+/* EP_STS - bitmasks */
+/* Setup transfer complete. */
+#define EP_STS_SETUP		BIT(0)
+/* Endpoint STALL status. */
+#define EP_STS_STALL(p)		((p) & BIT(1))
+/* Interrupt On Complete. */
+#define EP_STS_IOC		BIT(2)
+/* Interrupt on Short Packet. */
+#define EP_STS_ISP		BIT(3)
+/* Transfer descriptor missing. */
+#define EP_STS_DESCMIS		BIT(4)
+/* Stream Rejected (used only in SS mode) */
+#define EP_STS_STREAMR		BIT(5)
+/* EXIT from MOVE DATA State (used only for stream transfers in SS mode). */
+#define EP_STS_MD_EXIT		BIT(6)
+/* TRB error. */
+#define EP_STS_TRBERR		BIT(7)
+/* Not ready (used only in SS mode). */
+#define EP_STS_NRDY		BIT(8)
+/* DMA busy bit. */
+#define EP_STS_DBUSY		BIT(9)
+/* Endpoint Buffer Empty */
+#define EP_STS_BUFFEMPTY(p)	((p) & BIT(10))
+/* Current Cycle Status */
+#define EP_STS_CCS(p)		((p) & BIT(11))
+/* Prime (used only in SS mode. */
+#define EP_STS_PRIME		BIT(12)
+/* Stream error (used only in SS mode). */
+#define EP_STS_SIDERR		BIT(13)
+/* OUT size mismatch. */
+#define EP_STS_OUTSMM		BIT(14)
+/* ISO transmission error. */
+#define EP_STS_ISOERR		BIT(15)
+/* Host Packet Pending (only for SS mode). */
+#define EP_STS_HOSTPP(p)	((p) & BIT(16))
+/* Stream Protocol State Machine State (only for Bulk stream endpoints). */
+#define EP_STS_SPSMST_MASK		GENMASK(18, 17)
+#define EP_STS_SPSMST_DISABLED(p)	(((p) & EP_STS_SPSMST_MASK) >> 17)
+#define EP_STS_SPSMST_IDLE(p)		(((p) & EP_STS_SPSMST_MASK) >> 17)
+#define EP_STS_SPSMST_START_STREAM(p)	(((p) & EP_STS_SPSMST_MASK) >> 17)
+#define EP_STS_SPSMST_MOVE_DATA(p)	(((p) & EP_STS_SPSMST_MASK) >> 17)
+/* Interrupt On Transfer complete. */
+#define EP_STS_IOT		BIT(19)
+/* OUT queue endpoint number. */
+#define EP_STS_OUTQ_NO_MASK	GENMASK(27, 24)
+#define EP_STS_OUTQ_NO(p)	(((p) & EP_STS_OUTQ_NO_MASK) >> 24)
+/* OUT queue valid flag. */
+#define EP_STS_OUTQ_VAL_MASK	BIT(28)
+#define EP_STS_OUTQ_VAL(p)	((p) & EP_STS_OUTQ_VAL_MASK)
+/* SETUP WAIT. */
+#define EP_STS_STPWAIT		BIT(31)
+
+/* EP_STS_SID - bitmasks */
+/* Stream ID (used only in SS mode). */
+#define EP_STS_SID_MASK		GENMASK(15, 0)
+#define EP_STS_SID(p)		((p) & EP_STS_SID_MASK)
+
+/* EP_STS_EN - bitmasks */
+/* SETUP interrupt enable. */
+#define EP_STS_EN_SETUPEN	BIT(0)
+/* OUT transfer missing descriptor enable. */
+#define EP_STS_EN_DESCMISEN	BIT(4)
+/* Stream Rejected enable. */
+#define EP_STS_EN_STREAMREN	BIT(5)
+/* Move Data Exit enable.*/
+#define EP_STS_EN_MD_EXITEN	BIT(6)
+/* TRB enable. */
+#define EP_STS_EN_TRBERREN	BIT(7)
+/* NRDY enable. */
+#define EP_STS_EN_NRDYEN	BIT(8)
+/* Prime enable. */
+#define EP_STS_EN_PRIMEEEN	BIT(12)
+/* Stream error enable. */
+#define EP_STS_EN_SIDERREN	BIT(13)
+/* OUT size mismatch enable. */
+#define EP_STS_EN_OUTSMMEN	BIT(14)
+/* ISO transmission error enable. */
+#define EP_STS_EN_ISOERREN	BIT(15)
+/* Interrupt on Transmission complete enable. */
+#define EP_STS_EN_IOTEN		BIT(19)
+/* Setup Wait interrupt enable. */
+#define EP_STS_EN_STPWAITEN	BIT(31)
+
+/* DRBL- bitmasks */
+#define DB_VALUE_BY_INDEX(index) (1 << (index))
+#define DB_VALUE_EP0_OUT	BIT(0)
+#define DB_VALUE_EP0_IN		BIT(16)
+
+/* EP_IEN - bitmasks */
+#define EP_IEN(index)		(1 << (index))
+#define EP_IEN_EP_OUT0		BIT(0)
+#define EP_IEN_EP_IN0		BIT(16)
+
+/* EP_ISTS - bitmasks */
+#define EP_ISTS(index)		(1 << (index))
+#define EP_ISTS_EP_OUT0		BIT(0)
+#define EP_ISTS_EP_IN0		BIT(16)
+
+/* USB_PWR- bitmasks */
+/*Power Shut Off capability enable*/
+#define PUSB_PWR_PSO_EN		BIT(0)
+/*Power Shut Off capability disable*/
+#define PUSB_PWR_PSO_DS		BIT(1)
+/*
+ * Enables turning-off Reference Clock.
+ * This bit is optional and implemented only when support for OTG is
+ * implemented (indicated by OTG_READY bit set to '1').
+ */
+#define PUSB_PWR_STB_CLK_SWITCH_EN	BIT(8)
+/*
+ * Status bit indicating that operation required by STB_CLK_SWITCH_EN write
+ * is completed
+ */
+#define PUSB_PWR_STB_CLK_SWITCH_DONE	BIT(9)
+/* This bit informs if Fast Registers Access is enabled. */
+#define PUSB_PWR_FST_REG_ACCESS_STAT	BIT(30)
+/* Fast Registers Access Enable. */
+#define PUSB_PWR_FST_REG_ACCESS		BIT(31)
+
+/* USB_CONF2- bitmasks */
+/*
+ * Writing 1 disables TDL calculation basing on TRB feature in controller
+ * for DMULT mode.
+ * Bit supported only for DEV_VER_V2 version.
+ */
+#define USB_CONF2_DIS_TDL_TRB		BIT(1)
+/*
+ * Writing 1 enables TDL calculation basing on TRB feature in controller
+ * for DMULT mode.
+ * Bit supported only for DEV_VER_V2 version.
+ */
+#define USB_CONF2_EN_TDL_TRB		BIT(2)
+
+/* USB_CAP1- bitmasks */
+/*
+ * SFR Interface type
+ * These field reflects type of SFR interface implemented:
+ * 0x0 - OCP
+ * 0x1 - AHB,
+ * 0x2 - PLB
+ * 0x3 - AXI
+ * 0x4-0xF - reserved
+ */
+#define USB_CAP1_SFR_TYPE_MASK	GENMASK(3, 0)
+#define DEV_SFR_TYPE_OCP(p)	(((p) & USB_CAP1_SFR_TYPE_MASK) == 0x0)
+#define DEV_SFR_TYPE_AHB(p)	(((p) & USB_CAP1_SFR_TYPE_MASK) == 0x1)
+#define DEV_SFR_TYPE_PLB(p)	(((p) & USB_CAP1_SFR_TYPE_MASK) == 0x2)
+#define DEV_SFR_TYPE_AXI(p)	(((p) & USB_CAP1_SFR_TYPE_MASK) == 0x3)
+/*
+ * SFR Interface width
+ * These field reflects width of SFR interface implemented:
+ * 0x0 - 8 bit interface,
+ * 0x1 - 16 bit interface,
+ * 0x2 - 32 bit interface
+ * 0x3 - 64 bit interface
+ * 0x4-0xF - reserved
+ */
+#define USB_CAP1_SFR_WIDTH_MASK	GENMASK(7, 4)
+#define DEV_SFR_WIDTH_8(p)	(((p) & USB_CAP1_SFR_WIDTH_MASK) == (0x0 << 4))
+#define DEV_SFR_WIDTH_16(p)	(((p) & USB_CAP1_SFR_WIDTH_MASK) == (0x1 << 4))
+#define DEV_SFR_WIDTH_32(p)	(((p) & USB_CAP1_SFR_WIDTH_MASK) == (0x2 << 4))
+#define DEV_SFR_WIDTH_64(p)	(((p) & USB_CAP1_SFR_WIDTH_MASK) == (0x3 << 4))
+/*
+ * DMA Interface type
+ * These field reflects type of DMA interface implemented:
+ * 0x0 - OCP
+ * 0x1 - AHB,
+ * 0x2 - PLB
+ * 0x3 - AXI
+ * 0x4-0xF - reserved
+ */
+#define USB_CAP1_DMA_TYPE_MASK	GENMASK(11, 8)
+#define DEV_DMA_TYPE_OCP(p)	(((p) & USB_CAP1_DMA_TYPE_MASK) == (0x0 << 8))
+#define DEV_DMA_TYPE_AHB(p)	(((p) & USB_CAP1_DMA_TYPE_MASK) == (0x1 << 8))
+#define DEV_DMA_TYPE_PLB(p)	(((p) & USB_CAP1_DMA_TYPE_MASK) == (0x2 << 8))
+#define DEV_DMA_TYPE_AXI(p)	(((p) & USB_CAP1_DMA_TYPE_MASK) == (0x3 << 8))
+/*
+ * DMA Interface width
+ * These field reflects width of DMA interface implemented:
+ * 0x0 - reserved,
+ * 0x1 - reserved,
+ * 0x2 - 32 bit interface
+ * 0x3 - 64 bit interface
+ * 0x4-0xF - reserved
+ */
+#define USB_CAP1_DMA_WIDTH_MASK	GENMASK(15, 12)
+#define DEV_DMA_WIDTH_32(p)	(((p) & USB_CAP1_DMA_WIDTH_MASK) == (0x2 << 12))
+#define DEV_DMA_WIDTH_64(p)	(((p) & USB_CAP1_DMA_WIDTH_MASK) == (0x3 << 12))
+/*
+ * USB3 PHY Interface type
+ * These field reflects type of USB3 PHY interface implemented:
+ * 0x0 - USB PIPE,
+ * 0x1 - RMMI,
+ * 0x2-0xF - reserved
+ */
+#define USB_CAP1_U3PHY_TYPE_MASK GENMASK(19, 16)
+#define DEV_U3PHY_PIPE(p) (((p) & USB_CAP1_U3PHY_TYPE_MASK) == (0x0 << 16))
+#define DEV_U3PHY_RMMI(p) (((p) & USB_CAP1_U3PHY_TYPE_MASK) == (0x1 << 16))
+/*
+ * USB3 PHY Interface width
+ * These field reflects width of USB3 PHY interface implemented:
+ * 0x0 - 8 bit PIPE interface,
+ * 0x1 - 16 bit PIPE interface,
+ * 0x2 - 32 bit PIPE interface,
+ * 0x3 - 64 bit PIPE interface
+ * 0x4-0xF - reserved
+ * Note: When SSIC interface is implemented this field shows the width of
+ * internal PIPE interface. The RMMI interface is always 20bit wide.
+ */
+#define USB_CAP1_U3PHY_WIDTH_MASK GENMASK(23, 20)
+#define DEV_U3PHY_WIDTH_8(p) \
+	(((p) & USB_CAP1_U3PHY_WIDTH_MASK) == (0x0 << 20))
+#define DEV_U3PHY_WIDTH_16(p) \
+	(((p) & USB_CAP1_U3PHY_WIDTH_MASK) == (0x1 << 16))
+#define DEV_U3PHY_WIDTH_32(p) \
+	(((p) & USB_CAP1_U3PHY_WIDTH_MASK) == (0x2 << 20))
+#define DEV_U3PHY_WIDTH_64(p) \
+	(((p) & USB_CAP1_U3PHY_WIDTH_MASK) == (0x3 << 16))
+
+/*
+ * USB2 PHY Interface enable
+ * These field informs if USB2 PHY interface is implemented:
+ * 0x0 - interface NOT implemented,
+ * 0x1 - interface implemented
+ */
+#define USB_CAP1_U2PHY_EN(p)	((p) & BIT(24))
+/*
+ * USB2 PHY Interface type
+ * These field reflects type of USB2 PHY interface implemented:
+ * 0x0 - UTMI,
+ * 0x1 - ULPI
+ */
+#define DEV_U2PHY_ULPI(p)	((p) & BIT(25))
+/*
+ * USB2 PHY Interface width
+ * These field reflects width of USB2 PHY interface implemented:
+ * 0x0 - 8 bit interface,
+ * 0x1 - 16 bit interface,
+ * Note: The ULPI interface is always 8bit wide.
+ */
+#define DEV_U2PHY_WIDTH_16(p)	((p) & BIT(26))
+/*
+ * OTG Ready
+ * 0x0 - pure device mode
+ * 0x1 - some features and ports for CDNS USB OTG controller are implemented.
+ */
+#define USB_CAP1_OTG_READY(p)	((p) & BIT(27))
+
+/*
+ * When set, indicates that controller supports automatic internal TDL
+ * calculation basing on the size provided in TRB (TRB[22:17]) for DMULT mode
+ * Supported only for DEV_VER_V2 controller version.
+ */
+#define USB_CAP1_TDL_FROM_TRB(p)	((p) & BIT(28))
+
+/* USB_CAP2- bitmasks */
+/*
+ * The actual size of the connected On-chip RAM memory in kB:
+ * - 0 means 256 kB (max supported mem size)
+ * - value other than 0 reflects the mem size in kB
+ */
+#define USB_CAP2_ACTUAL_MEM_SIZE(p) ((p) & GENMASK(7, 0))
+/*
+ * Max supported mem size
+ * These field reflects width of on-chip RAM address bus width,
+ * which determines max supported mem size:
+ * 0x0-0x7 - reserved,
+ * 0x8 - support for 4kB mem,
+ * 0x9 - support for 8kB mem,
+ * 0xA - support for 16kB mem,
+ * 0xB - support for 32kB mem,
+ * 0xC - support for 64kB mem,
+ * 0xD - support for 128kB mem,
+ * 0xE - support for 256kB mem,
+ * 0xF - reserved
+ */
+#define USB_CAP2_MAX_MEM_SIZE(p) ((p) & GENMASK(11, 8))
+
+/* USB_CAP3- bitmasks */
+#define EP_IS_IMPLEMENTED(reg, index) ((reg) & (1 << (index)))
+
+/* USB_CAP4- bitmasks */
+#define EP_SUPPORT_ISO(reg, index) ((reg) & (1 << (index)))
+
+/* USB_CAP5- bitmasks */
+#define EP_SUPPORT_STREAM(reg, index) ((reg) & (1 << (index)))
+
+/* USB_CAP6- bitmasks */
+/* The USBSS-DEV Controller  Internal build number. */
+#define GET_DEV_BASE_VERSION(p) ((p) & GENMASK(23, 0))
+/* The USBSS-DEV Controller version number. */
+#define GET_DEV_CUSTOM_VERSION(p) ((p) & GENMASK(31, 24))
+
+#define DEV_VER_NXP_V1		0x00024502
+#define DEV_VER_TI_V1		0x00024509
+#define DEV_VER_V2		0x0002450C
+#define DEV_VER_V3		0x0002450d
+
+/* DBG_LINK1- bitmasks */
+/*
+ * LFPS_MIN_DET_U1_EXIT value This parameter configures the minimum
+ * time required for decoding the received LFPS as an LFPS.U1_Exit.
+ */
+#define DBG_LINK1_LFPS_MIN_DET_U1_EXIT(p)	((p) & GENMASK(7, 0))
+/*
+ * LFPS_MIN_GEN_U1_EXIT value This parameter configures the minimum time for
+ * phytxelecidle deassertion when LFPS.U1_Exit
+ */
+#define DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_MASK	GENMASK(15, 8)
+#define DBG_LINK1_LFPS_MIN_GEN_U1_EXIT(p)	(((p) << 8) & GENMASK(15, 8))
+/*
+ * RXDET_BREAK_DIS value This parameter configures terminating the Far-end
+ * Receiver termination detection sequence:
+ * 0: it is possible that USBSS_DEV will terminate Farend receiver
+ *    termination detection sequence
+ * 1: USBSS_DEV will not terminate Far-end receiver termination
+ *    detection sequence
+ */
+#define DBG_LINK1_RXDET_BREAK_DIS		BIT(16)
+/* LFPS_GEN_PING value This parameter configures the LFPS.Ping generation */
+#define DBG_LINK1_LFPS_GEN_PING(p)		(((p) << 17) & GENMASK(21, 17))
+/*
+ * Set the LFPS_MIN_DET_U1_EXIT value Writing '1' to this bit writes the
+ * LFPS_MIN_DET_U1_EXIT field value to the device. This bit is automatically
+ * cleared. Writing '0' has no effect
+ */
+#define DBG_LINK1_LFPS_MIN_DET_U1_EXIT_SET	BIT(24)
+/*
+ * Set the LFPS_MIN_GEN_U1_EXIT value. Writing '1' to this bit writes the
+ * LFPS_MIN_GEN_U1_EXIT field value to the device. This bit is automatically
+ * cleared. Writing '0' has no effect
+ */
+#define DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_SET	BIT(25)
+/*
+ * Set the RXDET_BREAK_DIS value Writing '1' to this bit writes
+ * the RXDET_BREAK_DIS field value to the device. This bit is automatically
+ * cleared. Writing '0' has no effect
+ */
+#define DBG_LINK1_RXDET_BREAK_DIS_SET		BIT(26)
+/*
+ * Set the LFPS_GEN_PING_SET value Writing '1' to this bit writes
+ * the LFPS_GEN_PING field value to the device. This bit is automatically
+ * cleared. Writing '0' has no effect."
+ */
+#define DBG_LINK1_LFPS_GEN_PING_SET		BIT(27)
+
+/* DMA_AXI_CTRL- bitmasks */
+/* The mawprot pin configuration. */
+#define DMA_AXI_CTRL_MARPROT(p) ((p) & GENMASK(2, 0))
+/* The marprot pin configuration. */
+#define DMA_AXI_CTRL_MAWPROT(p) (((p) & GENMASK(2, 0)) << 16)
+#define DMA_AXI_CTRL_NON_SECURE 0x02
+
+#define gadget_to_cdns3_device(g) (container_of(g, struct cdns3_device, gadget))
+
+#define ep_to_cdns3_ep(ep) (container_of(ep, struct cdns3_endpoint, endpoint))
+
+/*-------------------------------------------------------------------------*/
+/*
+ * USBSS-DEV DMA interface.
+ */
+#define TRBS_PER_SEGMENT	600
+
+#define ISO_MAX_INTERVAL	10
+
+#define MAX_TRB_LENGTH          BIT(16)
+
+#if TRBS_PER_SEGMENT < 2
+#error "Incorrect TRBS_PER_SEGMENT. Minimal Transfer Ring size is 2."
+#endif
+
+#define TRBS_PER_STREAM_SEGMENT 2
+
+#if TRBS_PER_STREAM_SEGMENT < 2
+#error "Incorrect TRBS_PER_STREAMS_SEGMENT. Minimal Transfer Ring size is 2."
+#endif
+
+/*
+ *Only for ISOC endpoints - maximum number of TRBs is calculated as
+ * pow(2, bInterval-1) * number of usb requests. It is limitation made by
+ * driver to save memory. Controller must prepare TRB for each ITP even
+ * if bInterval > 1. It's the reason why driver needs so many TRBs for
+ * isochronous endpoints.
+ */
+#define TRBS_PER_ISOC_SEGMENT	(ISO_MAX_INTERVAL * 8)
+
+#define GET_TRBS_PER_SEGMENT(ep_type) ((ep_type) == USB_ENDPOINT_XFER_ISOC ? \
+				      TRBS_PER_ISOC_SEGMENT : TRBS_PER_SEGMENT)
+/**
+ * struct cdns3_trb - represent Transfer Descriptor block.
+ * @buffer:	pointer to buffer data
+ * @length:	length of data
+ * @control:	control flags.
+ *
+ * This structure describes transfer block serviced by DMA module.
+ */
+struct cdns3_trb {
+	__le32 buffer;
+	__le32 length;
+	__le32 control;
+};
+
+#define TRB_SIZE		(sizeof(struct cdns3_trb))
+#define TRB_RING_SIZE		(TRB_SIZE * TRBS_PER_SEGMENT)
+#define TRB_STREAM_RING_SIZE	(TRB_SIZE * TRBS_PER_STREAM_SEGMENT)
+#define TRB_ISO_RING_SIZE	(TRB_SIZE * TRBS_PER_ISOC_SEGMENT)
+#define TRB_CTRL_RING_SIZE	(TRB_SIZE * 2)
+
+/* TRB bit mask */
+#define TRB_TYPE_BITMASK	GENMASK(15, 10)
+#define TRB_TYPE(p)		((p) << 10)
+#define TRB_FIELD_TO_TYPE(p)	(((p) & TRB_TYPE_BITMASK) >> 10)
+
+/* TRB type IDs */
+/* bulk, interrupt, isoc , and control data stage */
+#define TRB_NORMAL		1
+/* TRB for linking ring segments */
+#define TRB_LINK		6
+
+/* Cycle bit - indicates TRB ownership by driver or hw*/
+#define TRB_CYCLE		BIT(0)
+/*
+ * When set to '1', the device will toggle its interpretation of the Cycle bit
+ */
+#define TRB_TOGGLE		BIT(1)
+/*
+ * The controller will set it if OUTSMM (OUT size mismatch) is detected,
+ * this bit is for normal TRB
+ */
+#define TRB_SMM			BIT(1)
+
+/*
+ * Short Packet (SP). OUT EPs at DMULT=1 only. Indicates if the TRB was
+ * processed while USB short packet was received. No more buffers defined by
+ * the TD will be used. DMA will automatically advance to next TD.
+ * - Shall be set to 0 by Software when putting TRB on the Transfer Ring
+ * - Shall be set to 1 by Controller when Short Packet condition for this TRB
+ *   is detected independent if ISP is set or not.
+ */
+#define TRB_SP			BIT(1)
+
+/* Interrupt on short packet*/
+#define TRB_ISP			BIT(2)
+/*Setting this bit enables FIFO DMA operation mode*/
+#define TRB_FIFO_MODE		BIT(3)
+/* Set PCIe no snoop attribute */
+#define TRB_CHAIN		BIT(4)
+/* Interrupt on completion */
+#define TRB_IOC			BIT(5)
+
+/* stream ID bitmasks. */
+#define TRB_STREAM_ID_BITMASK		GENMASK(31, 16)
+#define TRB_STREAM_ID(p)		((p) << 16)
+#define TRB_FIELD_TO_STREAMID(p)	(((p) & TRB_STREAM_ID_BITMASK) >> 16)
+
+/* Size of TD expressed in USB packets for HS/FS mode. */
+#define TRB_TDL_HS_SIZE(p)	(((p) << 16) & GENMASK(31, 16))
+#define TRB_TDL_HS_SIZE_GET(p)	(((p) & GENMASK(31, 16)) >> 16)
+
+/* transfer_len bitmasks. */
+#define TRB_LEN(p)		((p) & GENMASK(16, 0))
+
+/* Size of TD expressed in USB packets for SS mode. */
+#define TRB_TDL_SS_SIZE(p)	(((p) << 17) & GENMASK(23, 17))
+#define TRB_TDL_SS_SIZE_GET(p)	(((p) & GENMASK(23, 17)) >> 17)
+
+/* transfer_len bitmasks - bits 31:24 */
+#define TRB_BURST_LEN(p)	((unsigned int)((p) << 24) & GENMASK(31, 24))
+#define TRB_BURST_LEN_GET(p)	(((p) & GENMASK(31, 24)) >> 24)
+
+/* Data buffer pointer bitmasks*/
+#define TRB_BUFFER(p)		((p) & GENMASK(31, 0))
+
+/*-------------------------------------------------------------------------*/
+/* Driver numeric constants */
+
+/* Such declaration should be added to ch9.h */
+#define USB_DEVICE_MAX_ADDRESS		127
+
+/* Endpoint init values */
+#define CDNS3_EP_MAX_PACKET_LIMIT	1024
+#define CDNS3_EP_MAX_STREAMS		15
+#define CDNS3_EP0_MAX_PACKET_LIMIT	512
+
+/* All endpoints including EP0 */
+#define CDNS3_ENDPOINTS_MAX_COUNT	32
+#define CDNS3_EP_ZLP_BUF_SIZE		1024
+
+#define CDNS3_MAX_NUM_DESCMISS_BUF	32
+#define CDNS3_DESCMIS_BUF_SIZE		2048	/* Bytes */
+#define CDNS3_WA2_NUM_BUFFERS		128
+/*-------------------------------------------------------------------------*/
+/* Used structs */
+
+struct cdns3_device;
+
+/**
+ * struct cdns3_endpoint - extended device side representation of USB endpoint.
+ * @endpoint: usb endpoint
+ * @pending_req_list: list of requests queuing on transfer ring.
+ * @deferred_req_list: list of requests waiting for queuing on transfer ring.
+ * @wa2_descmiss_req_list: list of requests internally allocated by driver.
+ * @trb_pool: transfer ring - array of transaction buffers
+ * @trb_pool_dma: dma address of transfer ring
+ * @cdns3_dev: device associated with this endpoint
+ * @name: a human readable name e.g. ep1out
+ * @flags: specify the current state of endpoint
+ * @descmis_req: internal transfer object used for getting data from on-chip
+ *     buffer. It can happen only if function driver doesn't send usb_request
+ *     object on time.
+ * @dir: endpoint direction
+ * @num: endpoint number (1 - 15)
+ * @type: set to bmAttributes & USB_ENDPOINT_XFERTYPE_MASK
+ * @interval: interval between packets used for ISOC endpoint.
+ * @free_trbs: number of free TRBs in transfer ring
+ * @num_trbs: number of all TRBs in transfer ring
+ * @alloc_ring_size: size of the allocated TRB ring
+ * @pcs: producer cycle state
+ * @ccs: consumer cycle state
+ * @enqueue: enqueue index in transfer ring
+ * @dequeue: dequeue index in transfer ring
+ * @trb_burst_size: number of burst used in trb.
+ */
+struct cdns3_endpoint {
+	struct usb_ep		endpoint;
+	struct list_head	pending_req_list;
+	struct list_head	deferred_req_list;
+	struct list_head	wa2_descmiss_req_list;
+	int			wa2_counter;
+
+	struct cdns3_trb	*trb_pool;
+	dma_addr_t		trb_pool_dma;
+
+	struct cdns3_device	*cdns3_dev;
+	char			name[20];
+
+#define EP_ENABLED		BIT(0)
+#define EP_STALLED		BIT(1)
+#define EP_STALL_PENDING	BIT(2)
+#define EP_WEDGE		BIT(3)
+#define EP_TRANSFER_STARTED	BIT(4)
+#define EP_UPDATE_EP_TRBADDR	BIT(5)
+#define EP_PENDING_REQUEST	BIT(6)
+#define EP_RING_FULL		BIT(7)
+#define EP_CLAIMED		BIT(8)
+#define EP_DEFERRED_DRDY	BIT(9)
+#define EP_QUIRK_ISO_OUT_EN	BIT(10)
+#define EP_QUIRK_END_TRANSFER	BIT(11)
+#define EP_QUIRK_EXTRA_BUF_DET	BIT(12)
+#define EP_QUIRK_EXTRA_BUF_EN	BIT(13)
+#define EP_TDLCHK_EN		BIT(15)
+#define EP_CONFIGURED		BIT(16)
+	u32			flags;
+
+	struct cdns3_request	*descmis_req;
+
+	u8			dir;
+	u8			num;
+	u8			type;
+	u8			mult;
+	u8			bMaxBurst;
+	u16			wMaxPacketSize;
+	int			interval;
+
+	int			free_trbs;
+	int			num_trbs;
+	int			alloc_ring_size;
+	u8			pcs;
+	u8			ccs;
+	int			enqueue;
+	int			dequeue;
+	u8			trb_burst_size;
+
+	unsigned int		wa1_set:1;
+	struct cdns3_trb	*wa1_trb;
+	unsigned int		wa1_trb_index;
+	unsigned int		wa1_cycle_bit:1;
+
+	/* Stream related */
+	unsigned int		use_streams:1;
+	unsigned int		prime_flag:1;
+	u32			ep_sts_pending;
+	u16			last_stream_id;
+	u16			pending_tdl;
+	unsigned int		stream_sg_idx;
+};
+
+/**
+ * struct cdns3_aligned_buf - represent aligned buffer used for DMA transfer
+ * @buf: aligned to 8 bytes data buffer. Buffer address used in
+ *       TRB shall be aligned to 8.
+ * @dma: dma address
+ * @size: size of buffer
+ * @in_use: inform if this buffer is associated with usb_request
+ * @list: used to adding instance of this object to list
+ */
+struct cdns3_aligned_buf {
+	void			*buf;
+	dma_addr_t		dma;
+	u32			size;
+	enum dma_data_direction dir;
+	unsigned		in_use:1;
+	struct list_head	list;
+};
+
+/**
+ * struct cdns3_request - extended device side representation of usb_request
+ *                        object .
+ * @request: generic usb_request object describing single I/O request.
+ * @priv_ep: extended representation of usb_ep object
+ * @trb: the first TRB association with this request
+ * @start_trb: number of the first TRB in transfer ring
+ * @end_trb: number of the last TRB in transfer ring
+ * @aligned_buf: object holds information about aligned buffer associated whit
+ *               this endpoint
+ * @flags: flag specifying special usage of request
+ * @list: used by internally allocated request to add to wa2_descmiss_req_list.
+ * @finished_trb: number of trb has already finished per request
+ * @num_of_trb: how many trbs in this request
+ */
+struct cdns3_request {
+	struct usb_request		request;
+	struct cdns3_endpoint		*priv_ep;
+	struct cdns3_trb		*trb;
+	int				start_trb;
+	int				end_trb;
+	struct cdns3_aligned_buf	*aligned_buf;
+#define REQUEST_PENDING			BIT(0)
+#define REQUEST_INTERNAL		BIT(1)
+#define REQUEST_INTERNAL_CH		BIT(2)
+#define REQUEST_ZLP			BIT(3)
+#define REQUEST_UNALIGNED		BIT(4)
+	u32				flags;
+	struct list_head		list;
+	int				finished_trb;
+	int				num_of_trb;
+};
+
+#define to_cdns3_request(r) (container_of(r, struct cdns3_request, request))
+
+/*Stages used during enumeration process.*/
+#define CDNS3_SETUP_STAGE		0x0
+#define CDNS3_DATA_STAGE		0x1
+#define CDNS3_STATUS_STAGE		0x2
+
+/**
+ * struct cdns3_device - represent USB device.
+ * @dev: pointer to device structure associated whit this controller
+ * @sysdev: pointer to the DMA capable device
+ * @gadget: device side representation of the peripheral controller
+ * @gadget_driver: pointer to the gadget driver
+ * @dev_ver: device controller version.
+ * @lock: for synchronizing
+ * @regs: base address for device side registers
+ * @setup_buf: used while processing usb control requests
+ * @setup_dma: dma address for setup_buf
+ * @zlp_buf - zlp buffer
+ * @ep0_stage: ep0 stage during enumeration process.
+ * @ep0_data_dir: direction for control transfer
+ * @eps: array of pointers to all endpoints with exclusion ep0
+ * @aligned_buf_list: list of aligned buffers internally allocated by driver
+ * @aligned_buf_wq: workqueue freeing  no longer used aligned buf.
+ * @selected_ep: actually selected endpoint. It's used only to improve
+ *               performance.
+ * @isoch_delay: value from Set Isoch Delay request. Only valid on SS/SSP.
+ * @u1_allowed: allow device transition to u1 state
+ * @u2_allowed: allow device transition to u2 state
+ * @is_selfpowered: device is self powered
+ * @setup_pending: setup packet is processing by gadget driver
+ * @hw_configured_flag: hardware endpoint configuration was set.
+ * @wake_up_flag: allow device to remote up the host
+ * @status_completion_no_call: indicate that driver is waiting for status s
+ *     stage completion. It's used in deferred SET_CONFIGURATION request.
+ * @onchip_buffers: number of available on-chip buffers.
+ * @onchip_used_size: actual size of on-chip memory assigned to endpoints.
+ * @pending_status_wq: workqueue handling status stage for deferred requests.
+ * @pending_status_request: request for which status stage was deferred
+ */
+struct cdns3_device {
+	struct device			*dev;
+	struct device			*sysdev;
+
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*gadget_driver;
+
+#define CDNS_REVISION_V0		0x00024501
+#define CDNS_REVISION_V1		0x00024509
+	u32				dev_ver;
+
+	/* generic spin-lock for drivers */
+	spinlock_t			lock;
+
+	struct cdns3_usb_regs		__iomem *regs;
+
+	struct dma_pool			*eps_dma_pool;
+	struct usb_ctrlrequest		*setup_buf;
+	dma_addr_t			setup_dma;
+	void				*zlp_buf;
+
+	u8				ep0_stage;
+	int				ep0_data_dir;
+
+	struct cdns3_endpoint		*eps[CDNS3_ENDPOINTS_MAX_COUNT];
+
+	struct list_head		aligned_buf_list;
+	struct work_struct		aligned_buf_wq;
+
+	u32				selected_ep;
+	u16				isoch_delay;
+
+	unsigned			wait_for_setup:1;
+	unsigned			u1_allowed:1;
+	unsigned			u2_allowed:1;
+	unsigned			is_selfpowered:1;
+	unsigned			setup_pending:1;
+	unsigned			hw_configured_flag:1;
+	unsigned			wake_up_flag:1;
+	unsigned			status_completion_no_call:1;
+	unsigned			using_streams:1;
+	int				out_mem_is_allocated;
+
+	struct work_struct		pending_status_wq;
+	struct usb_request		*pending_status_request;
+
+	/*in KB */
+	u16				onchip_buffers;
+	u16				onchip_used_size;
+
+	u16				ep_buf_size;
+	u16				ep_iso_burst;
+};
+
+void cdns3_set_register_bit(void __iomem *ptr, u32 mask);
+dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep,
+				 struct cdns3_trb *trb);
+enum usb_device_speed cdns3_get_speed(struct cdns3_device *priv_dev);
+void cdns3_pending_setup_status_handler(struct work_struct *work);
+void cdns3_hw_reset_eps_config(struct cdns3_device *priv_dev);
+void cdns3_set_hw_configuration(struct cdns3_device *priv_dev);
+void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep);
+void cdns3_allow_enable_l1(struct cdns3_device *priv_dev, int enable);
+struct usb_request *cdns3_next_request(struct list_head *list);
+void cdns3_rearm_transfer(struct cdns3_endpoint *priv_ep, u8 rearm);
+int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep);
+u8 cdns3_ep_addr_to_index(u8 ep_addr);
+int cdns3_gadget_ep_set_wedge(struct usb_ep *ep);
+int cdns3_gadget_ep_set_halt(struct usb_ep *ep, int value);
+void __cdns3_gadget_ep_set_halt(struct cdns3_endpoint *priv_ep);
+int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep);
+struct usb_request *cdns3_gadget_ep_alloc_request(struct usb_ep *ep,
+						  gfp_t gfp_flags);
+void cdns3_gadget_ep_free_request(struct usb_ep *ep,
+				  struct usb_request *request);
+int cdns3_gadget_ep_dequeue(struct usb_ep *ep, struct usb_request *request);
+void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
+			   struct cdns3_request *priv_req,
+			   int status);
+
+int cdns3_init_ep0(struct cdns3_device *priv_dev,
+		   struct cdns3_endpoint *priv_ep);
+void cdns3_ep0_config(struct cdns3_device *priv_dev);
+int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable);
+void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir);
+int __cdns3_gadget_wakeup(struct cdns3_device *priv_dev);
+
+#endif /* __LINUX_CDNS3_GADGET */
diff --git a/drivers/usb/cdns3/cdns3-imx.c b/drivers/usb/cdns3/cdns3-imx.c
new file mode 100644
index 0000000000..281de47e2a
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-imx.c
@@ -0,0 +1,437 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cdns3-imx.c - NXP i.MX specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2019 NXP
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/iopoll.h>
+#include <linux/pm_runtime.h>
+#include "core.h"
+
+#define USB3_CORE_CTRL1    0x00
+#define USB3_CORE_CTRL2    0x04
+#define USB3_INT_REG       0x08
+#define USB3_CORE_STATUS   0x0c
+#define XHCI_DEBUG_LINK_ST 0x10
+#define XHCI_DEBUG_BUS     0x14
+#define USB3_SSPHY_CTRL1   0x40
+#define USB3_SSPHY_CTRL2   0x44
+#define USB3_SSPHY_STATUS  0x4c
+#define USB2_PHY_CTRL1     0x50
+#define USB2_PHY_CTRL2     0x54
+#define USB2_PHY_STATUS    0x5c
+
+/* Register bits definition */
+
+/* USB3_CORE_CTRL1 */
+#define SW_RESET_MASK	GENMASK(31, 26)
+#define PWR_SW_RESET	BIT(31)
+#define APB_SW_RESET	BIT(30)
+#define AXI_SW_RESET	BIT(29)
+#define RW_SW_RESET	BIT(28)
+#define PHY_SW_RESET	BIT(27)
+#define PHYAHB_SW_RESET	BIT(26)
+#define ALL_SW_RESET	(PWR_SW_RESET | APB_SW_RESET | AXI_SW_RESET | \
+		RW_SW_RESET | PHY_SW_RESET | PHYAHB_SW_RESET)
+#define OC_DISABLE	BIT(9)
+#define MDCTRL_CLK_SEL	BIT(7)
+#define MODE_STRAP_MASK	(0x7)
+#define DEV_MODE	(1 << 2)
+#define HOST_MODE	(1 << 1)
+#define OTG_MODE	(1 << 0)
+
+/* USB3_INT_REG */
+#define CLK_125_REQ	BIT(29)
+#define LPM_CLK_REQ	BIT(28)
+#define DEVU3_WAEKUP_EN	BIT(14)
+#define OTG_WAKEUP_EN	BIT(12)
+#define DEV_INT_EN	(3 << 8) /* DEV INT b9:8 */
+#define HOST_INT1_EN	(1 << 0) /* HOST INT b7:0 */
+
+/* USB3_CORE_STATUS */
+#define MDCTRL_CLK_STATUS	BIT(15)
+#define DEV_POWER_ON_READY	BIT(13)
+#define HOST_POWER_ON_READY	BIT(12)
+
+/* USB3_SSPHY_STATUS */
+#define CLK_VALID_MASK		(0x3f << 26)
+#define CLK_VALID_COMPARE_BITS	(0xf << 28)
+#define PHY_REFCLK_REQ		(1 << 0)
+
+/* OTG registers definition */
+#define OTGSTS		0x4
+/* OTGSTS */
+#define OTG_NRDY	BIT(11)
+
+/* xHCI registers definition  */
+#define XECP_PM_PMCSR		0x8018
+#define XECP_AUX_CTRL_REG1	0x8120
+
+/* Register bits definition */
+/* XECP_AUX_CTRL_REG1 */
+#define CFG_RXDET_P3_EN		BIT(15)
+
+/* XECP_PM_PMCSR */
+#define PS_MASK			GENMASK(1, 0)
+#define PS_D0			0
+#define PS_D1			1
+
+struct cdns_imx {
+	struct device *dev;
+	void __iomem *noncore;
+	struct clk_bulk_data *clks;
+	int num_clks;
+	struct platform_device *cdns3_pdev;
+};
+
+static inline u32 cdns_imx_readl(struct cdns_imx *data, u32 offset)
+{
+	return readl(data->noncore + offset);
+}
+
+static inline void cdns_imx_writel(struct cdns_imx *data, u32 offset, u32 value)
+{
+	writel(value, data->noncore + offset);
+}
+
+static const struct clk_bulk_data imx_cdns3_core_clks[] = {
+	{ .id = "lpm" },
+	{ .id = "bus" },
+	{ .id = "aclk" },
+	{ .id = "ipg" },
+	{ .id = "core" },
+};
+
+static int cdns_imx_noncore_init(struct cdns_imx *data)
+{
+	u32 value;
+	int ret;
+	struct device *dev = data->dev;
+
+	cdns_imx_writel(data, USB3_SSPHY_STATUS, CLK_VALID_MASK);
+	udelay(1);
+	ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
+		(value & CLK_VALID_COMPARE_BITS) == CLK_VALID_COMPARE_BITS,
+		10, 100000);
+	if (ret) {
+		dev_err(dev, "wait clkvld timeout\n");
+		return ret;
+	}
+
+	value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+	value |= ALL_SW_RESET;
+	cdns_imx_writel(data, USB3_CORE_CTRL1, value);
+	udelay(1);
+
+	value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+	value = (value & ~MODE_STRAP_MASK) | OTG_MODE | OC_DISABLE;
+	cdns_imx_writel(data, USB3_CORE_CTRL1, value);
+
+	value = cdns_imx_readl(data, USB3_INT_REG);
+	value |= HOST_INT1_EN | DEV_INT_EN;
+	cdns_imx_writel(data, USB3_INT_REG, value);
+
+	value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+	value &= ~ALL_SW_RESET;
+	cdns_imx_writel(data, USB3_CORE_CTRL1, value);
+	return ret;
+}
+
+static int cdns_imx_platform_suspend(struct device *dev,
+	bool suspend, bool wakeup);
+static struct cdns3_platform_data cdns_imx_pdata = {
+	.platform_suspend = cdns_imx_platform_suspend,
+	.quirks		  = CDNS3_DEFAULT_PM_RUNTIME_ALLOW,
+};
+
+static const struct of_dev_auxdata cdns_imx_auxdata[] = {
+	{
+		.compatible = "cdns,usb3",
+		.platform_data = &cdns_imx_pdata,
+	},
+	{},
+};
+
+static int cdns_imx_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct cdns_imx *data;
+	int ret;
+
+	if (!node)
+		return -ENODEV;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+	data->dev = dev;
+	data->noncore = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(data->noncore)) {
+		dev_err(dev, "can't map IOMEM resource\n");
+		return PTR_ERR(data->noncore);
+	}
+
+	data->num_clks = ARRAY_SIZE(imx_cdns3_core_clks);
+	data->clks = devm_kmemdup(dev, imx_cdns3_core_clks,
+				sizeof(imx_cdns3_core_clks), GFP_KERNEL);
+	if (!data->clks)
+		return -ENOMEM;
+
+	ret = devm_clk_bulk_get(dev, data->num_clks, data->clks);
+	if (ret)
+		return ret;
+
+	ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+	if (ret)
+		return ret;
+
+	ret = cdns_imx_noncore_init(data);
+	if (ret)
+		goto err;
+
+	ret = of_platform_populate(node, NULL, cdns_imx_auxdata, dev);
+	if (ret) {
+		dev_err(dev, "failed to create children: %d\n", ret);
+		goto err;
+	}
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return ret;
+err:
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+	return ret;
+}
+
+static void cdns_imx_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdns_imx *data = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+	of_platform_depopulate(dev);
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	platform_set_drvdata(pdev, NULL);
+}
+
+#ifdef CONFIG_PM
+static void cdns3_set_wakeup(struct cdns_imx *data, bool enable)
+{
+	u32 value;
+
+	value = cdns_imx_readl(data, USB3_INT_REG);
+	if (enable)
+		value |= OTG_WAKEUP_EN | DEVU3_WAEKUP_EN;
+	else
+		value &= ~(OTG_WAKEUP_EN | DEVU3_WAEKUP_EN);
+
+	cdns_imx_writel(data, USB3_INT_REG, value);
+}
+
+static int cdns_imx_platform_suspend(struct device *dev,
+		bool suspend, bool wakeup)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	struct device *parent = dev->parent;
+	struct cdns_imx *data = dev_get_drvdata(parent);
+	void __iomem *otg_regs = (void __iomem *)(cdns->otg_regs);
+	void __iomem *xhci_regs = cdns->xhci_regs;
+	u32 value;
+	int ret = 0;
+
+	if (cdns->role != USB_ROLE_HOST)
+		return 0;
+
+	if (suspend) {
+		/* SW request low power when all usb ports allow to it ??? */
+		value = readl(xhci_regs + XECP_PM_PMCSR);
+		value &= ~PS_MASK;
+		value |= PS_D1;
+		writel(value, xhci_regs + XECP_PM_PMCSR);
+
+		/* mdctrl_clk_sel */
+		value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+		value |= MDCTRL_CLK_SEL;
+		cdns_imx_writel(data, USB3_CORE_CTRL1, value);
+
+		/* wait for mdctrl_clk_status */
+		value = cdns_imx_readl(data, USB3_CORE_STATUS);
+		ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
+			(value & MDCTRL_CLK_STATUS) == MDCTRL_CLK_STATUS,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait mdctrl_clk_status timeout\n");
+
+		/* wait lpm_clk_req to be 0 */
+		value = cdns_imx_readl(data, USB3_INT_REG);
+		ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
+			(value & LPM_CLK_REQ) != LPM_CLK_REQ,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait lpm_clk_req timeout\n");
+
+		/* wait phy_refclk_req to be 0 */
+		value = cdns_imx_readl(data, USB3_SSPHY_STATUS);
+		ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
+			(value & PHY_REFCLK_REQ) != PHY_REFCLK_REQ,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait phy_refclk_req timeout\n");
+
+		cdns3_set_wakeup(data, wakeup);
+	} else {
+		cdns3_set_wakeup(data, false);
+
+		/* SW request D0 */
+		value = readl(xhci_regs + XECP_PM_PMCSR);
+		value &= ~PS_MASK;
+		value |= PS_D0;
+		writel(value, xhci_regs + XECP_PM_PMCSR);
+
+		/* clr CFG_RXDET_P3_EN */
+		value = readl(xhci_regs + XECP_AUX_CTRL_REG1);
+		value &= ~CFG_RXDET_P3_EN;
+		writel(value, xhci_regs + XECP_AUX_CTRL_REG1);
+
+		/* clear mdctrl_clk_sel */
+		value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+		value &= ~MDCTRL_CLK_SEL;
+		cdns_imx_writel(data, USB3_CORE_CTRL1, value);
+
+		/* wait CLK_125_REQ to be 1 */
+		value = cdns_imx_readl(data, USB3_INT_REG);
+		ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
+			(value & CLK_125_REQ) == CLK_125_REQ,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait CLK_125_REQ timeout\n");
+
+		/* wait for mdctrl_clk_status is cleared */
+		value = cdns_imx_readl(data, USB3_CORE_STATUS);
+		ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
+			(value & MDCTRL_CLK_STATUS) != MDCTRL_CLK_STATUS,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait mdctrl_clk_status cleared timeout\n");
+
+		/* Wait until OTG_NRDY is 0 */
+		value = readl(otg_regs + OTGSTS);
+		ret = readl_poll_timeout(otg_regs + OTGSTS, value,
+			(value & OTG_NRDY) != OTG_NRDY,
+			10, 100000);
+		if (ret)
+			dev_warn(parent, "wait OTG ready timeout\n");
+	}
+
+	return ret;
+
+}
+
+static int cdns_imx_resume(struct device *dev)
+{
+	struct cdns_imx *data = dev_get_drvdata(dev);
+
+	return clk_bulk_prepare_enable(data->num_clks, data->clks);
+}
+
+static int cdns_imx_suspend(struct device *dev)
+{
+	struct cdns_imx *data = dev_get_drvdata(dev);
+
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+
+	return 0;
+}
+
+
+/* Indicate if the controller was power lost before */
+static inline bool cdns_imx_is_power_lost(struct cdns_imx *data)
+{
+	u32 value;
+
+	value = cdns_imx_readl(data, USB3_CORE_CTRL1);
+	if ((value & SW_RESET_MASK) == ALL_SW_RESET)
+		return true;
+	else
+		return false;
+}
+
+static int __maybe_unused cdns_imx_system_suspend(struct device *dev)
+{
+	pm_runtime_put_sync(dev);
+	return 0;
+}
+
+static int __maybe_unused cdns_imx_system_resume(struct device *dev)
+{
+	struct cdns_imx *data = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Could not get runtime PM.\n");
+		return ret;
+	}
+
+	if (cdns_imx_is_power_lost(data)) {
+		dev_dbg(dev, "resume from power lost\n");
+		ret = cdns_imx_noncore_init(data);
+		if (ret)
+			cdns_imx_suspend(dev);
+	}
+
+	return ret;
+}
+
+#else
+static int cdns_imx_platform_suspend(struct device *dev,
+	bool suspend, bool wakeup)
+{
+	return 0;
+}
+
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops cdns_imx_pm_ops = {
+	SET_RUNTIME_PM_OPS(cdns_imx_suspend, cdns_imx_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(cdns_imx_system_suspend, cdns_imx_system_resume)
+};
+
+static const struct of_device_id cdns_imx_of_match[] = {
+	{ .compatible = "fsl,imx8qm-usb3", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, cdns_imx_of_match);
+
+static struct platform_driver cdns_imx_driver = {
+	.probe		= cdns_imx_probe,
+	.remove_new	= cdns_imx_remove,
+	.driver		= {
+		.name	= "cdns3-imx",
+		.of_match_table	= cdns_imx_of_match,
+		.pm	= &cdns_imx_pm_ops,
+	},
+};
+module_platform_driver(cdns_imx_driver);
+
+MODULE_ALIAS("platform:cdns3-imx");
+MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 i.MX Glue Layer");
diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c
new file mode 100644
index 0000000000..1f6320d98a
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-pci-wrap.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS PCI Glue driver
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+struct cdns3_wrap {
+	struct platform_device *plat_dev;
+	struct resource dev_res[6];
+	int devfn;
+};
+
+#define RES_IRQ_HOST_ID		0
+#define RES_IRQ_PERIPHERAL_ID	1
+#define RES_IRQ_OTG_ID		2
+#define RES_HOST_ID		3
+#define RES_DEV_ID		4
+#define RES_DRD_ID		5
+
+#define PCI_BAR_HOST		0
+#define PCI_BAR_DEV		2
+#define PCI_BAR_OTG		0
+
+#define PCI_DEV_FN_HOST_DEVICE	0
+#define PCI_DEV_FN_OTG		1
+
+#define PCI_DRIVER_NAME		"cdns3-pci-usbss"
+#define PLAT_DRIVER_NAME	"cdns-usb3"
+
+#define CDNS_VENDOR_ID		0x17cd
+#define CDNS_DEVICE_ID		0x0100
+
+static struct pci_dev *cdns3_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 (unlikely(!func))
+		return NULL;
+
+	if (func->devfn == pdev->devfn) {
+		func = pci_get_device(pdev->vendor, pdev->device, func);
+		if (unlikely(!func))
+			return NULL;
+	}
+
+	if (func->devfn != PCI_DEV_FN_HOST_DEVICE &&
+	    func->devfn != PCI_DEV_FN_OTG) {
+		return NULL;
+	}
+
+	return func;
+}
+
+static int cdns3_pci_probe(struct pci_dev *pdev,
+			   const struct pci_device_id *id)
+{
+	struct platform_device_info plat_info;
+	struct cdns3_wrap *wrap;
+	struct resource *res;
+	struct pci_dev *func;
+	int err;
+
+	/*
+	 * 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 = cdns3_get_second_fun(pdev);
+	if (unlikely(!func))
+		return -EINVAL;
+
+	err = pcim_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
+		return err;
+	}
+
+	pci_set_master(pdev);
+
+	if (pci_is_enabled(func)) {
+		wrap = pci_get_drvdata(func);
+	} else {
+		wrap = kzalloc(sizeof(*wrap), GFP_KERNEL);
+		if (!wrap) {
+			pci_disable_device(pdev);
+			return -ENOMEM;
+		}
+	}
+
+	res = wrap->dev_res;
+
+	if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) {
+		/* function 0: host(BAR_0) + device(BAR_1).*/
+		dev_dbg(&pdev->dev, "Initialize Device resources\n");
+		res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
+		res[RES_DEV_ID].end =   pci_resource_end(pdev, PCI_BAR_DEV);
+		res[RES_DEV_ID].name = "dev";
+		res[RES_DEV_ID].flags = IORESOURCE_MEM;
+		dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
+			&res[RES_DEV_ID].start);
+
+		res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
+		res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
+		res[RES_HOST_ID].name = "xhci";
+		res[RES_HOST_ID].flags = IORESOURCE_MEM;
+		dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
+			&res[RES_HOST_ID].start);
+
+		/* Interrupt for XHCI */
+		wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq;
+		wrap->dev_res[RES_IRQ_HOST_ID].name = "host";
+		wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ;
+
+		/* Interrupt device. It's the same as for HOST. */
+		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq;
+		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral";
+		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ;
+	} else {
+		res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
+		res[RES_DRD_ID].end =   pci_resource_end(pdev, PCI_BAR_OTG);
+		res[RES_DRD_ID].name = "otg";
+		res[RES_DRD_ID].flags = IORESOURCE_MEM;
+		dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
+			&res[RES_DRD_ID].start);
+
+		/* Interrupt for OTG/DRD. */
+		wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq;
+		wrap->dev_res[RES_IRQ_OTG_ID].name = "otg";
+		wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ;
+	}
+
+	if (pci_is_enabled(func)) {
+		/* set up platform device info */
+		memset(&plat_info, 0, sizeof(plat_info));
+		plat_info.parent = &pdev->dev;
+		plat_info.fwnode = pdev->dev.fwnode;
+		plat_info.name = PLAT_DRIVER_NAME;
+		plat_info.id = pdev->devfn;
+		wrap->devfn  = pdev->devfn;
+		plat_info.res = wrap->dev_res;
+		plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
+		plat_info.dma_mask = pdev->dma_mask;
+		/* register platform device */
+		wrap->plat_dev = platform_device_register_full(&plat_info);
+		if (IS_ERR(wrap->plat_dev)) {
+			pci_disable_device(pdev);
+			err = PTR_ERR(wrap->plat_dev);
+			kfree(wrap);
+			return err;
+		}
+	}
+
+	pci_set_drvdata(pdev, wrap);
+	return err;
+}
+
+static void cdns3_pci_remove(struct pci_dev *pdev)
+{
+	struct cdns3_wrap *wrap;
+	struct pci_dev *func;
+
+	func = cdns3_get_second_fun(pdev);
+
+	wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
+	if (wrap->devfn == pdev->devfn)
+		platform_device_unregister(wrap->plat_dev);
+
+	if (!pci_is_enabled(func))
+		kfree(wrap);
+}
+
+static const struct pci_device_id cdns3_pci_ids[] = {
+	{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
+	{ 0, }
+};
+
+static struct pci_driver cdns3_pci_driver = {
+	.name = PCI_DRIVER_NAME,
+	.id_table = cdns3_pci_ids,
+	.probe = cdns3_pci_probe,
+	.remove = cdns3_pci_remove,
+};
+
+module_pci_driver(cdns3_pci_driver);
+MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
+
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USBSS PCI wrapper");
diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
new file mode 100644
index 0000000000..2c1aca84f2
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-plat.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver.
+ *
+ * Copyright (C) 2018-2020 Cadence.
+ * Copyright (C) 2017-2018 NXP
+ * Copyright (C) 2019 Texas Instruments
+ *
+ *
+ * Author: Peter Chen <peter.chen@nxp.com>
+ *         Pawel Laszczak <pawell@cadence.com>
+ *         Roger Quadros <rogerq@ti.com>
+ */
+
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "core.h"
+#include "gadget-export.h"
+#include "drd.h"
+
+static int set_phy_power_on(struct cdns *cdns)
+{
+	int ret;
+
+	ret = phy_power_on(cdns->usb2_phy);
+	if (ret)
+		return ret;
+
+	ret = phy_power_on(cdns->usb3_phy);
+	if (ret)
+		phy_power_off(cdns->usb2_phy);
+
+	return ret;
+}
+
+static void set_phy_power_off(struct cdns *cdns)
+{
+	phy_power_off(cdns->usb3_phy);
+	phy_power_off(cdns->usb2_phy);
+}
+
+/**
+ * cdns3_plat_probe - probe for cdns3 core device
+ * @pdev: Pointer to cdns3 core platform device
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static int cdns3_plat_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource	*res;
+	struct cdns *cdns;
+	void __iomem *regs;
+	int ret;
+
+	cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
+	if (!cdns)
+		return -ENOMEM;
+
+	cdns->dev = dev;
+	cdns->pdata = dev_get_platdata(dev);
+
+	platform_set_drvdata(pdev, cdns);
+
+	ret = platform_get_irq_byname(pdev, "host");
+	if (ret < 0)
+		return ret;
+
+	cdns->xhci_res[0].start = ret;
+	cdns->xhci_res[0].end = ret;
+	cdns->xhci_res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(ret);
+	cdns->xhci_res[0].name = "host";
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
+	if (!res) {
+		dev_err(dev, "couldn't get xhci resource\n");
+		return -ENXIO;
+	}
+
+	cdns->xhci_res[1] = *res;
+
+	cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
+
+	if (cdns->dev_irq < 0)
+		return cdns->dev_irq;
+
+	regs = devm_platform_ioremap_resource_byname(pdev, "dev");
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+	cdns->dev_regs	= regs;
+
+	cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
+	if (cdns->otg_irq < 0)
+		return cdns->otg_irq;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
+	if (!res) {
+		dev_err(dev, "couldn't get otg resource\n");
+		return -ENXIO;
+	}
+
+	cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
+
+	cdns->otg_res = *res;
+
+	cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
+	if (cdns->wakeup_irq == -EPROBE_DEFER)
+		return cdns->wakeup_irq;
+
+	if (cdns->wakeup_irq < 0) {
+		dev_dbg(dev, "couldn't get wakeup irq\n");
+		cdns->wakeup_irq = 0x0;
+	}
+
+	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
+	if (IS_ERR(cdns->usb2_phy))
+		return PTR_ERR(cdns->usb2_phy);
+
+	ret = phy_init(cdns->usb2_phy);
+	if (ret)
+		return ret;
+
+	cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
+	if (IS_ERR(cdns->usb3_phy))
+		return PTR_ERR(cdns->usb3_phy);
+
+	ret = phy_init(cdns->usb3_phy);
+	if (ret)
+		goto err_phy3_init;
+
+	ret = set_phy_power_on(cdns);
+	if (ret)
+		goto err_phy_power_on;
+
+	cdns->gadget_init = cdns3_gadget_init;
+
+	ret = cdns_init(cdns);
+	if (ret)
+		goto err_cdns_init;
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
+		pm_runtime_forbid(dev);
+
+	/*
+	 * The controller needs less time between bus and controller suspend,
+	 * and we also needs a small delay to avoid frequently entering low
+	 * power mode.
+	 */
+	pm_runtime_set_autosuspend_delay(dev, 20);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_use_autosuspend(dev);
+
+	return 0;
+
+err_cdns_init:
+	set_phy_power_off(cdns);
+err_phy_power_on:
+	phy_exit(cdns->usb3_phy);
+err_phy3_init:
+	phy_exit(cdns->usb2_phy);
+
+	return ret;
+}
+
+/**
+ * cdns3_plat_remove() - unbind drd driver and clean up
+ * @pdev: Pointer to Linux platform device
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static void cdns3_plat_remove(struct platform_device *pdev)
+{
+	struct cdns *cdns = platform_get_drvdata(pdev);
+	struct device *dev = cdns->dev;
+
+	pm_runtime_get_sync(dev);
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	cdns_remove(cdns);
+	set_phy_power_off(cdns);
+	phy_exit(cdns->usb2_phy);
+	phy_exit(cdns->usb3_phy);
+}
+
+#ifdef CONFIG_PM
+
+static int cdns3_set_platform_suspend(struct device *dev,
+				      bool suspend, bool wakeup)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (cdns->pdata && cdns->pdata->platform_suspend)
+		ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
+
+	return ret;
+}
+
+static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	bool wakeup;
+	unsigned long flags;
+
+	if (cdns->in_lpm)
+		return 0;
+
+	if (PMSG_IS_AUTO(msg))
+		wakeup = true;
+	else
+		wakeup = device_may_wakeup(dev);
+
+	cdns3_set_platform_suspend(cdns->dev, true, wakeup);
+	set_phy_power_off(cdns);
+	spin_lock_irqsave(&cdns->lock, flags);
+	cdns->in_lpm = true;
+	spin_unlock_irqrestore(&cdns->lock, flags);
+	dev_dbg(cdns->dev, "%s ends\n", __func__);
+
+	return 0;
+}
+
+static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	int ret;
+	unsigned long flags;
+
+	if (!cdns->in_lpm)
+		return 0;
+
+	if (cdns_power_is_lost(cdns)) {
+		phy_exit(cdns->usb2_phy);
+		ret = phy_init(cdns->usb2_phy);
+		if (ret)
+			return ret;
+
+		phy_exit(cdns->usb3_phy);
+		ret = phy_init(cdns->usb3_phy);
+		if (ret)
+			return ret;
+	}
+
+	ret = set_phy_power_on(cdns);
+	if (ret)
+		return ret;
+
+	cdns3_set_platform_suspend(cdns->dev, false, false);
+
+	spin_lock_irqsave(&cdns->lock, flags);
+	cdns_resume(cdns);
+	cdns->in_lpm = false;
+	spin_unlock_irqrestore(&cdns->lock, flags);
+	cdns_set_active(cdns, !PMSG_IS_AUTO(msg));
+	if (cdns->wakeup_pending) {
+		cdns->wakeup_pending = false;
+		enable_irq(cdns->wakeup_irq);
+	}
+	dev_dbg(cdns->dev, "%s ends\n", __func__);
+
+	return ret;
+}
+
+static int cdns3_plat_runtime_suspend(struct device *dev)
+{
+	return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
+}
+
+static int cdns3_plat_runtime_resume(struct device *dev)
+{
+	return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int cdns3_plat_suspend(struct device *dev)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	int ret;
+
+	cdns_suspend(cdns);
+
+	ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
+	if (ret)
+		return ret;
+
+	if (device_may_wakeup(dev) && cdns->wakeup_irq)
+		enable_irq_wake(cdns->wakeup_irq);
+
+	return ret;
+}
+
+static int cdns3_plat_resume(struct device *dev)
+{
+	return cdns3_controller_resume(dev, PMSG_RESUME);
+}
+#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops cdns3_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
+	SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
+			   cdns3_plat_runtime_resume, NULL)
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_cdns3_match[] = {
+	{ .compatible = "cdns,usb3" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, of_cdns3_match);
+#endif
+
+static struct platform_driver cdns3_driver = {
+	.probe		= cdns3_plat_probe,
+	.remove_new	= cdns3_plat_remove,
+	.driver		= {
+		.name	= "cdns-usb3",
+		.of_match_table	= of_match_ptr(of_cdns3_match),
+		.pm	= &cdns3_pm_ops,
+	},
+};
+
+module_platform_driver(cdns3_driver);
+
+MODULE_ALIAS("platform:cdns3");
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
diff --git a/drivers/usb/cdns3/cdns3-starfive.c b/drivers/usb/cdns3/cdns3-starfive.c
new file mode 100644
index 0000000000..a7265b86e4
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-starfive.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ *
+ * Author:	Minda Chen <minda.chen@starfivetech.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/reset.h>
+#include <linux/regmap.h>
+#include <linux/usb/otg.h>
+#include "core.h"
+
+#define USB_STRAP_HOST			BIT(17)
+#define USB_STRAP_DEVICE		BIT(18)
+#define USB_STRAP_MASK			GENMASK(18, 16)
+
+#define USB_SUSPENDM_HOST		BIT(19)
+#define USB_SUSPENDM_MASK		BIT(19)
+
+#define USB_MISC_CFG_MASK		GENMASK(23, 20)
+#define USB_SUSPENDM_BYPS		BIT(20)
+#define USB_PLL_EN			BIT(22)
+#define USB_REFCLK_MODE			BIT(23)
+
+struct cdns_starfive {
+	struct device *dev;
+	struct regmap *stg_syscon;
+	struct reset_control *resets;
+	struct clk_bulk_data *clks;
+	int num_clks;
+	u32 stg_usb_mode;
+};
+
+static void cdns_mode_init(struct platform_device *pdev,
+			   struct cdns_starfive *data)
+{
+	enum usb_dr_mode mode;
+
+	regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+			   USB_MISC_CFG_MASK,
+			   USB_SUSPENDM_BYPS | USB_PLL_EN | USB_REFCLK_MODE);
+
+	/* dr mode setting */
+	mode = usb_get_dr_mode(&pdev->dev);
+
+	switch (mode) {
+	case USB_DR_MODE_HOST:
+		regmap_update_bits(data->stg_syscon,
+				   data->stg_usb_mode,
+				   USB_STRAP_MASK,
+				   USB_STRAP_HOST);
+		regmap_update_bits(data->stg_syscon,
+				   data->stg_usb_mode,
+				   USB_SUSPENDM_MASK,
+				   USB_SUSPENDM_HOST);
+		break;
+
+	case USB_DR_MODE_PERIPHERAL:
+		regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+				   USB_STRAP_MASK, USB_STRAP_DEVICE);
+		regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+				   USB_SUSPENDM_MASK, 0);
+		break;
+	default:
+		break;
+	}
+}
+
+static int cdns_clk_rst_init(struct cdns_starfive *data)
+{
+	int ret;
+
+	ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+	if (ret)
+		return dev_err_probe(data->dev, ret,
+				     "failed to enable clocks\n");
+
+	ret = reset_control_deassert(data->resets);
+	if (ret) {
+		dev_err(data->dev, "failed to reset clocks\n");
+		goto err_clk_init;
+	}
+
+	return ret;
+
+err_clk_init:
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+	return ret;
+}
+
+static void cdns_clk_rst_deinit(struct cdns_starfive *data)
+{
+	reset_control_assert(data->resets);
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+}
+
+static int cdns_starfive_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdns_starfive *data;
+	unsigned int args;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->dev = dev;
+
+	data->stg_syscon =
+		syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+						     "starfive,stg-syscon", 1, &args);
+
+	if (IS_ERR(data->stg_syscon))
+		return dev_err_probe(dev, PTR_ERR(data->stg_syscon),
+				     "Failed to parse starfive,stg-syscon\n");
+
+	data->stg_usb_mode = args;
+
+	data->num_clks = devm_clk_bulk_get_all(data->dev, &data->clks);
+	if (data->num_clks < 0)
+		return dev_err_probe(data->dev, -ENODEV,
+				     "Failed to get clocks\n");
+
+	data->resets = devm_reset_control_array_get_exclusive(data->dev);
+	if (IS_ERR(data->resets))
+		return dev_err_probe(data->dev, PTR_ERR(data->resets),
+				     "Failed to get resets");
+
+	cdns_mode_init(pdev, data);
+	ret = cdns_clk_rst_init(data);
+	if (ret)
+		return ret;
+
+	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+	if (ret) {
+		dev_err(dev, "Failed to create children\n");
+		cdns_clk_rst_deinit(data);
+		return ret;
+	}
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	platform_set_drvdata(pdev, data);
+
+	return 0;
+}
+
+static int cdns_starfive_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static void cdns_starfive_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+	device_for_each_child(dev, NULL, cdns_starfive_remove_core);
+
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	cdns_clk_rst_deinit(data);
+	platform_set_drvdata(pdev, NULL);
+}
+
+#ifdef CONFIG_PM
+static int cdns_starfive_runtime_resume(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	return clk_bulk_prepare_enable(data->num_clks, data->clks);
+}
+
+static int cdns_starfive_runtime_suspend(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cdns_starfive_resume(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	return cdns_clk_rst_init(data);
+}
+
+static int cdns_starfive_suspend(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	cdns_clk_rst_deinit(data);
+
+	return 0;
+}
+#endif
+#endif
+
+static const struct dev_pm_ops cdns_starfive_pm_ops = {
+	SET_RUNTIME_PM_OPS(cdns_starfive_runtime_suspend,
+			   cdns_starfive_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(cdns_starfive_suspend, cdns_starfive_resume)
+};
+
+static const struct of_device_id cdns_starfive_of_match[] = {
+	{ .compatible = "starfive,jh7110-usb", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_starfive_of_match);
+
+static struct platform_driver cdns_starfive_driver = {
+	.probe		= cdns_starfive_probe,
+	.remove_new	= cdns_starfive_remove,
+	.driver		= {
+		.name	= "cdns3-starfive",
+		.of_match_table	= cdns_starfive_of_match,
+		.pm	= &cdns_starfive_pm_ops,
+	},
+};
+module_platform_driver(cdns_starfive_driver);
+
+MODULE_ALIAS("platform:cdns3-starfive");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 StarFive Glue Layer");
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
new file mode 100644
index 0000000000..5945c4b1e1
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cdns3-ti.c - TI specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+
+/* USB Wrapper register offsets */
+#define USBSS_PID		0x0
+#define	USBSS_W1		0x4
+#define USBSS_STATIC_CONFIG	0x8
+#define USBSS_PHY_TEST		0xc
+#define	USBSS_DEBUG_CTRL	0x10
+#define	USBSS_DEBUG_INFO	0x14
+#define	USBSS_DEBUG_LINK_STATE	0x18
+#define	USBSS_DEVICE_CTRL	0x1c
+
+/* Wrapper 1 register bits */
+#define USBSS_W1_PWRUP_RST		BIT(0)
+#define USBSS_W1_OVERCURRENT_SEL	BIT(8)
+#define USBSS_W1_MODESTRAP_SEL		BIT(9)
+#define USBSS_W1_OVERCURRENT		BIT(16)
+#define USBSS_W1_MODESTRAP_MASK		GENMASK(18, 17)
+#define USBSS_W1_MODESTRAP_SHIFT	17
+#define USBSS_W1_USB2_ONLY		BIT(19)
+
+/* Static config register bits */
+#define USBSS1_STATIC_PLL_REF_SEL_MASK	GENMASK(8, 5)
+#define USBSS1_STATIC_PLL_REF_SEL_SHIFT	5
+#define USBSS1_STATIC_LOOPBACK_MODE_MASK	GENMASK(4, 3)
+#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT	3
+#define USBSS1_STATIC_VBUS_SEL_MASK	GENMASK(2, 1)
+#define USBSS1_STATIC_VBUS_SEL_SHIFT	1
+#define USBSS1_STATIC_LANE_REVERSE	BIT(0)
+
+/* Modestrap modes */
+enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
+		      USBSS_MODESTRAP_MODE_HOST,
+		      USBSS_MODESTRAP_MODE_PERIPHERAL};
+
+struct cdns_ti {
+	struct device *dev;
+	void __iomem *usbss;
+	unsigned usb2_only:1;
+	unsigned vbus_divider:1;
+	struct clk *usb2_refclk;
+	struct clk *lpm_clk;
+};
+
+static const int cdns_ti_rate_table[] = {	/* in KHZ */
+	9600,
+	10000,
+	12000,
+	19200,
+	20000,
+	24000,
+	25000,
+	26000,
+	38400,
+	40000,
+	58000,
+	50000,
+	52000,
+};
+
+static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
+{
+	return readl(data->usbss + offset);
+}
+
+static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
+{
+	writel(value, data->usbss + offset);
+}
+
+static int cdns_ti_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = pdev->dev.of_node;
+	struct cdns_ti *data;
+	int error;
+	u32 reg;
+	int rate_code, i;
+	unsigned long rate;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+
+	data->dev = dev;
+
+	data->usbss = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(data->usbss)) {
+		dev_err(dev, "can't map IOMEM resource\n");
+		return PTR_ERR(data->usbss);
+	}
+
+	data->usb2_refclk = devm_clk_get(dev, "ref");
+	if (IS_ERR(data->usb2_refclk)) {
+		dev_err(dev, "can't get usb2_refclk\n");
+		return PTR_ERR(data->usb2_refclk);
+	}
+
+	data->lpm_clk = devm_clk_get(dev, "lpm");
+	if (IS_ERR(data->lpm_clk)) {
+		dev_err(dev, "can't get lpm_clk\n");
+		return PTR_ERR(data->lpm_clk);
+	}
+
+	rate = clk_get_rate(data->usb2_refclk);
+	rate /= 1000;	/* To KHz */
+	for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
+		if (cdns_ti_rate_table[i] == rate)
+			break;
+	}
+
+	if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
+		dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
+		return -EINVAL;
+	}
+
+	rate_code = i;
+
+	pm_runtime_enable(dev);
+	error = pm_runtime_get_sync(dev);
+	if (error < 0) {
+		dev_err(dev, "pm_runtime_get_sync failed: %d\n", error);
+		goto err;
+	}
+
+	/* assert RESET */
+	reg = cdns_ti_readl(data, USBSS_W1);
+	reg &= ~USBSS_W1_PWRUP_RST;
+	cdns_ti_writel(data, USBSS_W1, reg);
+
+	/* set static config */
+	reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+	reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
+	reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
+
+	reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
+	data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
+	if (data->vbus_divider)
+		reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
+
+	cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
+	reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+
+	/* set USB2_ONLY mode if requested */
+	reg = cdns_ti_readl(data, USBSS_W1);
+	data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
+	if (data->usb2_only)
+		reg |= USBSS_W1_USB2_ONLY;
+
+	/* set default modestrap */
+	reg |= USBSS_W1_MODESTRAP_SEL;
+	reg &= ~USBSS_W1_MODESTRAP_MASK;
+	reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT;
+	cdns_ti_writel(data, USBSS_W1, reg);
+
+	/* de-assert RESET */
+	reg |= USBSS_W1_PWRUP_RST;
+	cdns_ti_writel(data, USBSS_W1, reg);
+
+	error = of_platform_populate(node, NULL, NULL, dev);
+	if (error) {
+		dev_err(dev, "failed to create children: %d\n", error);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	pm_runtime_put_sync(data->dev);
+	pm_runtime_disable(data->dev);
+
+	return error;
+}
+
+static int cdns_ti_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static void cdns_ti_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	device_for_each_child(dev, NULL, cdns_ti_remove_core);
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+
+	platform_set_drvdata(pdev, NULL);
+}
+
+static const struct of_device_id cdns_ti_of_match[] = {
+	{ .compatible = "ti,j721e-usb", },
+	{ .compatible = "ti,am64-usb", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, cdns_ti_of_match);
+
+static struct platform_driver cdns_ti_driver = {
+	.probe		= cdns_ti_probe,
+	.remove_new	= cdns_ti_remove,
+	.driver		= {
+		.name	= "cdns3-ti",
+		.of_match_table	= cdns_ti_of_match,
+	},
+};
+
+module_platform_driver(cdns_ti_driver);
+
+MODULE_ALIAS("platform:cdns3-ti");
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");
diff --git a/drivers/usb/cdns3/cdns3-trace.c b/drivers/usb/cdns3/cdns3-trace.c
new file mode 100644
index 0000000000..b9858acaef
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-trace.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSS device controller driver Trace Support
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+
+#define CREATE_TRACE_POINTS
+#include "cdns3-trace.h"
diff --git a/drivers/usb/cdns3/cdns3-trace.h b/drivers/usb/cdns3/cdns3-trace.h
new file mode 100644
index 0000000000..40db89e333
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-trace.h
@@ -0,0 +1,557 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * USBSS device controller driver.
+ * Trace support header file.
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cdns3
+
+#if !defined(__LINUX_CDNS3_TRACE) || defined(TRACE_HEADER_MULTI_READ)
+#define __LINUX_CDNS3_TRACE
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+#include <asm/byteorder.h>
+#include <linux/usb/ch9.h>
+#include "core.h"
+#include "cdns3-gadget.h"
+#include "cdns3-debug.h"
+
+#define CDNS3_MSG_MAX	500
+
+TRACE_EVENT(cdns3_halt,
+	TP_PROTO(struct cdns3_endpoint *ep_priv, u8 halt, u8 flush),
+	TP_ARGS(ep_priv, halt, flush),
+	TP_STRUCT__entry(
+		__string(name, ep_priv->name)
+		__field(u8, halt)
+		__field(u8, flush)
+	),
+	TP_fast_assign(
+		__assign_str(name, ep_priv->name);
+		__entry->halt = halt;
+		__entry->flush = flush;
+	),
+	TP_printk("Halt %s for %s: %s", __entry->flush ? " and flush" : "",
+		  __get_str(name), __entry->halt ? "set" : "cleared")
+);
+
+TRACE_EVENT(cdns3_wa1,
+	TP_PROTO(struct cdns3_endpoint *ep_priv, char *msg),
+	TP_ARGS(ep_priv, msg),
+	TP_STRUCT__entry(
+		__string(ep_name, ep_priv->name)
+		__string(msg, msg)
+	),
+	TP_fast_assign(
+		__assign_str(ep_name, ep_priv->name);
+		__assign_str(msg, msg);
+	),
+	TP_printk("WA1: %s %s", __get_str(ep_name), __get_str(msg))
+);
+
+TRACE_EVENT(cdns3_wa2,
+	TP_PROTO(struct cdns3_endpoint *ep_priv, char *msg),
+	TP_ARGS(ep_priv, msg),
+	TP_STRUCT__entry(
+		__string(ep_name, ep_priv->name)
+		__string(msg, msg)
+	),
+	TP_fast_assign(
+		__assign_str(ep_name, ep_priv->name);
+		__assign_str(msg, msg);
+	),
+	TP_printk("WA2: %s %s", __get_str(ep_name), __get_str(msg))
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_doorbell,
+	TP_PROTO(const char *ep_name, u32 ep_trbaddr),
+	TP_ARGS(ep_name, ep_trbaddr),
+	TP_STRUCT__entry(
+		__string(name, ep_name)
+		__field(u32, ep_trbaddr)
+	),
+	TP_fast_assign(
+		__assign_str(name, ep_name);
+		__entry->ep_trbaddr = ep_trbaddr;
+	),
+	TP_printk("%s, ep_trbaddr %08x", __get_str(name),
+		  __entry->ep_trbaddr)
+);
+
+DEFINE_EVENT(cdns3_log_doorbell, cdns3_doorbell_ep0,
+	TP_PROTO(const char *ep_name, u32 ep_trbaddr),
+	TP_ARGS(ep_name, ep_trbaddr)
+);
+
+DEFINE_EVENT(cdns3_log_doorbell, cdns3_doorbell_epx,
+	TP_PROTO(const char *ep_name, u32 ep_trbaddr),
+	TP_ARGS(ep_name, ep_trbaddr)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_usb_irq,
+	TP_PROTO(struct cdns3_device *priv_dev, u32 usb_ists),
+	TP_ARGS(priv_dev, usb_ists),
+	TP_STRUCT__entry(
+		__field(enum usb_device_speed, speed)
+		__field(u32, usb_ists)
+	),
+	TP_fast_assign(
+		__entry->speed = cdns3_get_speed(priv_dev);
+		__entry->usb_ists = usb_ists;
+	),
+	TP_printk("%s", cdns3_decode_usb_irq(__get_buf(CDNS3_MSG_MAX), __entry->speed,
+					     __entry->usb_ists))
+);
+
+DEFINE_EVENT(cdns3_log_usb_irq, cdns3_usb_irq,
+	TP_PROTO(struct cdns3_device *priv_dev, u32 usb_ists),
+	TP_ARGS(priv_dev, usb_ists)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_epx_irq,
+	TP_PROTO(struct cdns3_device *priv_dev, struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_dev, priv_ep),
+	TP_STRUCT__entry(
+		__string(ep_name, priv_ep->name)
+		__field(u32, ep_sts)
+		__field(u32, ep_traddr)
+		__field(u32, ep_last_sid)
+		__field(u32, use_streams)
+	),
+	TP_fast_assign(
+		__assign_str(ep_name, priv_ep->name);
+		__entry->ep_sts = readl(&priv_dev->regs->ep_sts);
+		__entry->ep_traddr = readl(&priv_dev->regs->ep_traddr);
+		__entry->ep_last_sid = priv_ep->last_stream_id;
+		__entry->use_streams = priv_ep->use_streams;
+	),
+	TP_printk("%s, ep_traddr: %08x ep_last_sid: %08x use_streams: %d",
+		  cdns3_decode_epx_irq(__get_buf(CDNS3_MSG_MAX),
+				       __get_str(ep_name),
+				       __entry->ep_sts),
+		  __entry->ep_traddr,
+		  __entry->ep_last_sid,
+		  __entry->use_streams)
+);
+
+DEFINE_EVENT(cdns3_log_epx_irq, cdns3_epx_irq,
+	TP_PROTO(struct cdns3_device *priv_dev, struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_dev, priv_ep)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_ep0_irq,
+	TP_PROTO(struct cdns3_device *priv_dev,  u32 ep_sts),
+	TP_ARGS(priv_dev, ep_sts),
+	TP_STRUCT__entry(
+		__field(int, ep_dir)
+		__field(u32, ep_sts)
+	),
+	TP_fast_assign(
+		__entry->ep_dir = priv_dev->selected_ep;
+		__entry->ep_sts = ep_sts;
+	),
+	TP_printk("%s", cdns3_decode_ep0_irq(__get_buf(CDNS3_MSG_MAX),
+					     __entry->ep_dir,
+					     __entry->ep_sts))
+);
+
+DEFINE_EVENT(cdns3_log_ep0_irq, cdns3_ep0_irq,
+	TP_PROTO(struct cdns3_device *priv_dev, u32 ep_sts),
+	TP_ARGS(priv_dev, ep_sts)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_ctrl,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl),
+	TP_STRUCT__entry(
+		__field(u8, bRequestType)
+		__field(u8, bRequest)
+		__field(u16, wValue)
+		__field(u16, wIndex)
+		__field(u16, wLength)
+	),
+	TP_fast_assign(
+		__entry->bRequestType = ctrl->bRequestType;
+		__entry->bRequest = ctrl->bRequest;
+		__entry->wValue = le16_to_cpu(ctrl->wValue);
+		__entry->wIndex = le16_to_cpu(ctrl->wIndex);
+		__entry->wLength = le16_to_cpu(ctrl->wLength);
+	),
+	TP_printk("%s", usb_decode_ctrl(__get_buf(CDNS3_MSG_MAX), CDNS3_MSG_MAX,
+					__entry->bRequestType,
+					__entry->bRequest, __entry->wValue,
+					__entry->wIndex, __entry->wLength)
+	)
+);
+
+DEFINE_EVENT(cdns3_log_ctrl, cdns3_ctrl_req,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_request,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__string(name, req->priv_ep->name)
+		__field(struct cdns3_request *, req)
+		__field(void *, buf)
+		__field(unsigned int, actual)
+		__field(unsigned int, length)
+		__field(int, status)
+		__field(int, zero)
+		__field(int, short_not_ok)
+		__field(int, no_interrupt)
+		__field(int, start_trb)
+		__field(int, end_trb)
+		__field(int, flags)
+		__field(unsigned int, stream_id)
+	),
+	TP_fast_assign(
+		__assign_str(name, req->priv_ep->name);
+		__entry->req = req;
+		__entry->buf = req->request.buf;
+		__entry->actual = req->request.actual;
+		__entry->length = req->request.length;
+		__entry->status = req->request.status;
+		__entry->zero = req->request.zero;
+		__entry->short_not_ok = req->request.short_not_ok;
+		__entry->no_interrupt = req->request.no_interrupt;
+		__entry->start_trb = req->start_trb;
+		__entry->end_trb = req->end_trb;
+		__entry->flags = req->flags;
+		__entry->stream_id = req->request.stream_id;
+	),
+	TP_printk("%s: req: %p, req buff %p, length: %u/%u %s%s%s, status: %d,"
+		  " trb: [start:%d, end:%d], flags:%x SID: %u",
+		__get_str(name), __entry->req, __entry->buf, __entry->actual,
+		__entry->length,
+		__entry->zero ? "Z" : "z",
+		__entry->short_not_ok ? "S" : "s",
+		__entry->no_interrupt ? "I" : "i",
+		__entry->status,
+		__entry->start_trb,
+		__entry->end_trb,
+		__entry->flags,
+		__entry->stream_id
+	)
+);
+
+DEFINE_EVENT(cdns3_log_request, cdns3_alloc_request,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_log_request, cdns3_free_request,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_log_request, cdns3_ep_queue,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_log_request, cdns3_ep_dequeue,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_log_request, cdns3_gadget_giveback,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+TRACE_EVENT(cdns3_ep0_queue,
+	TP_PROTO(struct cdns3_device *dev_priv, struct usb_request *request),
+	TP_ARGS(dev_priv, request),
+	TP_STRUCT__entry(
+		__field(int, dir)
+		__field(int, length)
+	),
+	TP_fast_assign(
+		__entry->dir = dev_priv->ep0_data_dir;
+		__entry->length = request->length;
+	),
+	TP_printk("Queue to ep0%s length: %u", __entry->dir ? "in" : "out",
+		  __entry->length)
+);
+
+DECLARE_EVENT_CLASS(cdns3_stream_split_transfer_len,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__string(name, req->priv_ep->name)
+		__field(struct cdns3_request *, req)
+		__field(unsigned int, length)
+		__field(unsigned int, actual)
+		__field(unsigned int, stream_id)
+	),
+	TP_fast_assign(
+		__assign_str(name, req->priv_ep->name);
+		__entry->req = req;
+		__entry->actual = req->request.length;
+		__entry->length = req->request.actual;
+		__entry->stream_id = req->request.stream_id;
+	),
+	TP_printk("%s: req: %p,request length: %u actual length: %u  SID: %u",
+		  __get_str(name), __entry->req, __entry->length,
+		  __entry->actual, __entry->stream_id)
+);
+
+DEFINE_EVENT(cdns3_stream_split_transfer_len, cdns3_stream_transfer_split,
+	     TP_PROTO(struct cdns3_request *req),
+	     TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_stream_split_transfer_len,
+	     cdns3_stream_transfer_split_next_part,
+	     TP_PROTO(struct cdns3_request *req),
+	     TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_aligned_request,
+	TP_PROTO(struct cdns3_request *priv_req),
+	TP_ARGS(priv_req),
+	TP_STRUCT__entry(
+		__string(name, priv_req->priv_ep->name)
+		__field(struct usb_request *, req)
+		__field(void *, buf)
+		__field(dma_addr_t, dma)
+		__field(void *, aligned_buf)
+		__field(dma_addr_t, aligned_dma)
+		__field(u32, aligned_buf_size)
+	),
+	TP_fast_assign(
+		__assign_str(name, priv_req->priv_ep->name);
+		__entry->req = &priv_req->request;
+		__entry->buf = priv_req->request.buf;
+		__entry->dma = priv_req->request.dma;
+		__entry->aligned_buf = priv_req->aligned_buf->buf;
+		__entry->aligned_dma = priv_req->aligned_buf->dma;
+		__entry->aligned_buf_size = priv_req->aligned_buf->size;
+	),
+	TP_printk("%s: req: %p, req buf %p, dma %pad a_buf %p a_dma %pad, size %d",
+		__get_str(name), __entry->req, __entry->buf, &__entry->dma,
+		__entry->aligned_buf, &__entry->aligned_dma,
+		__entry->aligned_buf_size
+	)
+);
+
+DEFINE_EVENT(cdns3_log_aligned_request, cdns3_free_aligned_request,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdns3_log_aligned_request, cdns3_prepare_aligned_request,
+	TP_PROTO(struct cdns3_request *req),
+	TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_map_request,
+	TP_PROTO(struct cdns3_request *priv_req),
+	TP_ARGS(priv_req),
+	TP_STRUCT__entry(
+		__string(name, priv_req->priv_ep->name)
+		__field(struct usb_request *, req)
+		__field(void *, buf)
+		__field(dma_addr_t, dma)
+	),
+	TP_fast_assign(
+		__assign_str(name, priv_req->priv_ep->name);
+		__entry->req = &priv_req->request;
+		__entry->buf = priv_req->request.buf;
+		__entry->dma = priv_req->request.dma;
+	),
+	TP_printk("%s: req: %p, req buf %p, dma %p",
+		  __get_str(name), __entry->req, __entry->buf, &__entry->dma
+	)
+);
+DEFINE_EVENT(cdns3_log_map_request, cdns3_map_request,
+	     TP_PROTO(struct cdns3_request *req),
+	     TP_ARGS(req)
+);
+DEFINE_EVENT(cdns3_log_map_request, cdns3_mapped_request,
+	     TP_PROTO(struct cdns3_request *req),
+	     TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_trb,
+	TP_PROTO(struct cdns3_endpoint *priv_ep, struct cdns3_trb *trb),
+	TP_ARGS(priv_ep, trb),
+	TP_STRUCT__entry(
+		__string(name, priv_ep->name)
+		__field(struct cdns3_trb *, trb)
+		__field(u32, buffer)
+		__field(u32, length)
+		__field(u32, control)
+		__field(u32, type)
+		__field(unsigned int, last_stream_id)
+	),
+	TP_fast_assign(
+		__assign_str(name, priv_ep->name);
+		__entry->trb = trb;
+		__entry->buffer = le32_to_cpu(trb->buffer);
+		__entry->length = le32_to_cpu(trb->length);
+		__entry->control = le32_to_cpu(trb->control);
+		__entry->type = usb_endpoint_type(priv_ep->endpoint.desc);
+		__entry->last_stream_id = priv_ep->last_stream_id;
+	),
+	TP_printk("%s: trb %p, dma buf: 0x%08x, size: %ld, burst: %d ctrl: 0x%08x (%s%s%s%s%s%s%s) SID:%lu LAST_SID:%u",
+		__get_str(name), __entry->trb, __entry->buffer,
+		TRB_LEN(__entry->length),
+		(u8)TRB_BURST_LEN_GET(__entry->length),
+		__entry->control,
+		__entry->control & TRB_CYCLE ? "C=1, " : "C=0, ",
+		__entry->control & TRB_TOGGLE ? "T=1, " : "T=0, ",
+		__entry->control & TRB_ISP ? "ISP, " : "",
+		__entry->control & TRB_FIFO_MODE ? "FIFO, " : "",
+		__entry->control & TRB_CHAIN ? "CHAIN, " : "",
+		__entry->control & TRB_IOC ? "IOC, " : "",
+		TRB_FIELD_TO_TYPE(__entry->control) == TRB_NORMAL ? "Normal" : "LINK",
+		TRB_FIELD_TO_STREAMID(__entry->control),
+		__entry->last_stream_id
+	)
+);
+
+DEFINE_EVENT(cdns3_log_trb, cdns3_prepare_trb,
+	TP_PROTO(struct cdns3_endpoint *priv_ep, struct cdns3_trb *trb),
+	TP_ARGS(priv_ep, trb)
+);
+
+DEFINE_EVENT(cdns3_log_trb, cdns3_complete_trb,
+	TP_PROTO(struct cdns3_endpoint *priv_ep, struct cdns3_trb *trb),
+	TP_ARGS(priv_ep, trb)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_ring,
+	TP_PROTO(struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_ep),
+	TP_STRUCT__entry(
+		__dynamic_array(char, buffer,
+				GET_TRBS_PER_SEGMENT(priv_ep->type) > TRBS_PER_SEGMENT ?
+				CDNS3_MSG_MAX :
+				(GET_TRBS_PER_SEGMENT(priv_ep->type) * 65) + CDNS3_MSG_MAX)
+	),
+	TP_fast_assign(
+		cdns3_dbg_ring(priv_ep, __get_str(buffer));
+	),
+
+	TP_printk("%s", __get_str(buffer))
+);
+
+DEFINE_EVENT(cdns3_log_ring, cdns3_ring,
+	TP_PROTO(struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_ep)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_ep,
+	TP_PROTO(struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_ep),
+	TP_STRUCT__entry(
+		__string(name, priv_ep->name)
+		__field(unsigned int, maxpacket)
+		__field(unsigned int, maxpacket_limit)
+		__field(unsigned int, max_streams)
+		__field(unsigned int, use_streams)
+		__field(unsigned int, maxburst)
+		__field(unsigned int, flags)
+		__field(unsigned int, dir)
+		__field(u8, enqueue)
+		__field(u8, dequeue)
+	),
+	TP_fast_assign(
+		__assign_str(name, priv_ep->name);
+		__entry->maxpacket = priv_ep->endpoint.maxpacket;
+		__entry->maxpacket_limit = priv_ep->endpoint.maxpacket_limit;
+		__entry->max_streams = priv_ep->endpoint.max_streams;
+		__entry->use_streams = priv_ep->use_streams;
+		__entry->maxburst = priv_ep->endpoint.maxburst;
+		__entry->flags = priv_ep->flags;
+		__entry->dir = priv_ep->dir;
+		__entry->enqueue = priv_ep->enqueue;
+		__entry->dequeue = priv_ep->dequeue;
+	),
+	TP_printk("%s: mps: %d/%d. streams: %d, stream enable: %d, burst: %d, "
+		  "enq idx: %d, deq idx: %d, flags %s%s%s%s%s%s%s%s, dir: %s",
+		__get_str(name), __entry->maxpacket,
+		__entry->maxpacket_limit, __entry->max_streams,
+		__entry->use_streams,
+		__entry->maxburst, __entry->enqueue,
+		__entry->dequeue,
+		__entry->flags & EP_ENABLED ? "EN | " : "",
+		__entry->flags & EP_STALLED ? "STALLED | " : "",
+		__entry->flags & EP_WEDGE ? "WEDGE | " : "",
+		__entry->flags & EP_TRANSFER_STARTED ? "STARTED | " : "",
+		__entry->flags & EP_UPDATE_EP_TRBADDR ? "UPD TRB | " : "",
+		__entry->flags & EP_PENDING_REQUEST ? "REQ PEN | " : "",
+		__entry->flags & EP_RING_FULL ? "RING FULL |" : "",
+		__entry->flags & EP_CLAIMED ?  "CLAIMED " : "",
+		__entry->dir ? "IN" : "OUT"
+	)
+);
+
+DEFINE_EVENT(cdns3_log_ep, cdns3_gadget_ep_enable,
+	TP_PROTO(struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_ep)
+);
+
+DEFINE_EVENT(cdns3_log_ep, cdns3_gadget_ep_disable,
+	TP_PROTO(struct cdns3_endpoint *priv_ep),
+	TP_ARGS(priv_ep)
+);
+
+DECLARE_EVENT_CLASS(cdns3_log_request_handled,
+	TP_PROTO(struct cdns3_request *priv_req, int current_index,
+		 int handled),
+	TP_ARGS(priv_req, current_index, handled),
+	TP_STRUCT__entry(
+		__field(struct cdns3_request *, priv_req)
+		__field(unsigned int, dma_position)
+		__field(unsigned int, handled)
+		__field(unsigned int, dequeue_idx)
+		__field(unsigned int, enqueue_idx)
+		__field(unsigned int, start_trb)
+		__field(unsigned int, end_trb)
+	),
+	TP_fast_assign(
+		__entry->priv_req = priv_req;
+		__entry->dma_position = current_index;
+		__entry->handled = handled;
+		__entry->dequeue_idx = priv_req->priv_ep->dequeue;
+		__entry->enqueue_idx = priv_req->priv_ep->enqueue;
+		__entry->start_trb = priv_req->start_trb;
+		__entry->end_trb = priv_req->end_trb;
+	),
+	TP_printk("Req: %p %s, DMA pos: %d, ep deq: %d, ep enq: %d,"
+		  " start trb: %d, end trb: %d",
+		__entry->priv_req,
+		__entry->handled ? "handled" : "not handled",
+		__entry->dma_position, __entry->dequeue_idx,
+		__entry->enqueue_idx, __entry->start_trb,
+		__entry->end_trb
+	)
+);
+
+DEFINE_EVENT(cdns3_log_request_handled, cdns3_request_handled,
+	TP_PROTO(struct cdns3_request *priv_req, int current_index,
+		 int handled),
+	TP_ARGS(priv_req, current_index, handled)
+);
+#endif /* __LINUX_CDNS3_TRACE */
+
+/* this part must be outside header guard */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE cdns3-trace
+
+#include <trace/define_trace.h>
diff --git a/drivers/usb/cdns3/cdnsp-debug.h b/drivers/usb/cdns3/cdnsp-debug.h
new file mode 100644
index 0000000000..f0ca865cce
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-debug.h
@@ -0,0 +1,586 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+#ifndef __LINUX_CDNSP_DEBUG
+#define __LINUX_CDNSP_DEBUG
+
+static inline const char *cdnsp_trb_comp_code_string(u8 status)
+{
+	switch (status) {
+	case COMP_INVALID:
+		return "Invalid";
+	case COMP_SUCCESS:
+		return "Success";
+	case COMP_DATA_BUFFER_ERROR:
+		return "Data Buffer Error";
+	case COMP_BABBLE_DETECTED_ERROR:
+		return "Babble Detected";
+	case COMP_TRB_ERROR:
+		return "TRB Error";
+	case COMP_RESOURCE_ERROR:
+		return "Resource Error";
+	case COMP_NO_SLOTS_AVAILABLE_ERROR:
+		return "No Slots Available Error";
+	case COMP_INVALID_STREAM_TYPE_ERROR:
+		return "Invalid Stream Type Error";
+	case COMP_SLOT_NOT_ENABLED_ERROR:
+		return "Slot Not Enabled Error";
+	case COMP_ENDPOINT_NOT_ENABLED_ERROR:
+		return "Endpoint Not Enabled Error";
+	case COMP_SHORT_PACKET:
+		return "Short Packet";
+	case COMP_RING_UNDERRUN:
+		return "Ring Underrun";
+	case COMP_RING_OVERRUN:
+		return "Ring Overrun";
+	case COMP_VF_EVENT_RING_FULL_ERROR:
+		return "VF Event Ring Full Error";
+	case COMP_PARAMETER_ERROR:
+		return "Parameter Error";
+	case COMP_CONTEXT_STATE_ERROR:
+		return "Context State Error";
+	case COMP_EVENT_RING_FULL_ERROR:
+		return "Event Ring Full Error";
+	case COMP_INCOMPATIBLE_DEVICE_ERROR:
+		return "Incompatible Device Error";
+	case COMP_MISSED_SERVICE_ERROR:
+		return "Missed Service Error";
+	case COMP_COMMAND_RING_STOPPED:
+		return "Command Ring Stopped";
+	case COMP_COMMAND_ABORTED:
+		return "Command Aborted";
+	case COMP_STOPPED:
+		return "Stopped";
+	case COMP_STOPPED_LENGTH_INVALID:
+		return "Stopped - Length Invalid";
+	case COMP_STOPPED_SHORT_PACKET:
+		return "Stopped - Short Packet";
+	case COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR:
+		return "Max Exit Latency Too Large Error";
+	case COMP_ISOCH_BUFFER_OVERRUN:
+		return "Isoch Buffer Overrun";
+	case COMP_EVENT_LOST_ERROR:
+		return "Event Lost Error";
+	case COMP_UNDEFINED_ERROR:
+		return "Undefined Error";
+	case COMP_INVALID_STREAM_ID_ERROR:
+		return "Invalid Stream ID Error";
+	default:
+		return "Unknown!!";
+	}
+}
+
+static inline const char *cdnsp_trb_type_string(u8 type)
+{
+	switch (type) {
+	case TRB_NORMAL:
+		return "Normal";
+	case TRB_SETUP:
+		return "Setup Stage";
+	case TRB_DATA:
+		return "Data Stage";
+	case TRB_STATUS:
+		return "Status Stage";
+	case TRB_ISOC:
+		return "Isoch";
+	case TRB_LINK:
+		return "Link";
+	case TRB_EVENT_DATA:
+		return "Event Data";
+	case TRB_TR_NOOP:
+		return "No-Op";
+	case TRB_ENABLE_SLOT:
+		return "Enable Slot Command";
+	case TRB_DISABLE_SLOT:
+		return "Disable Slot Command";
+	case TRB_ADDR_DEV:
+		return "Address Device Command";
+	case TRB_CONFIG_EP:
+		return "Configure Endpoint Command";
+	case TRB_EVAL_CONTEXT:
+		return "Evaluate Context Command";
+	case TRB_RESET_EP:
+		return "Reset Endpoint Command";
+	case TRB_STOP_RING:
+		return "Stop Ring Command";
+	case TRB_SET_DEQ:
+		return "Set TR Dequeue Pointer Command";
+	case TRB_RESET_DEV:
+		return "Reset Device Command";
+	case TRB_FORCE_HEADER:
+		return "Force Header Command";
+	case TRB_CMD_NOOP:
+		return "No-Op Command";
+	case TRB_TRANSFER:
+		return "Transfer Event";
+	case TRB_COMPLETION:
+		return "Command Completion Event";
+	case TRB_PORT_STATUS:
+		return "Port Status Change Event";
+	case TRB_HC_EVENT:
+		return "Device Controller Event";
+	case TRB_MFINDEX_WRAP:
+		return "MFINDEX Wrap Event";
+	case TRB_ENDPOINT_NRDY:
+		return "Endpoint Not ready";
+	case TRB_HALT_ENDPOINT:
+		return "Halt Endpoint";
+	case TRB_FLUSH_ENDPOINT:
+		return "FLush Endpoint";
+	default:
+		return "UNKNOWN";
+	}
+}
+
+static inline const char *cdnsp_ring_type_string(enum cdnsp_ring_type type)
+{
+	switch (type) {
+	case TYPE_CTRL:
+		return "CTRL";
+	case TYPE_ISOC:
+		return "ISOC";
+	case TYPE_BULK:
+		return "BULK";
+	case TYPE_INTR:
+		return "INTR";
+	case TYPE_STREAM:
+		return "STREAM";
+	case TYPE_COMMAND:
+		return "CMD";
+	case TYPE_EVENT:
+		return "EVENT";
+	}
+
+	return "UNKNOWN";
+}
+
+static inline char *cdnsp_slot_state_string(u32 state)
+{
+	switch (state) {
+	case SLOT_STATE_ENABLED:
+		return "enabled/disabled";
+	case SLOT_STATE_DEFAULT:
+		return "default";
+	case SLOT_STATE_ADDRESSED:
+		return "addressed";
+	case SLOT_STATE_CONFIGURED:
+		return "configured";
+	default:
+		return "reserved";
+	}
+}
+
+static inline const char *cdnsp_decode_trb(char *str, size_t size, u32 field0,
+					   u32 field1, u32 field2, u32 field3)
+{
+	int ep_id = TRB_TO_EP_INDEX(field3) - 1;
+	int type = TRB_FIELD_TO_TYPE(field3);
+	unsigned int ep_num;
+	int ret;
+	u32 temp;
+
+	ep_num = DIV_ROUND_UP(ep_id, 2);
+
+	switch (type) {
+	case TRB_LINK:
+		ret = snprintf(str, size,
+			       "LINK %08x%08x intr %ld type '%s' flags %c:%c:%c:%c",
+			       field1, field0, GET_INTR_TARGET(field2),
+			       cdnsp_trb_type_string(type),
+			       field3 & TRB_IOC ? 'I' : 'i',
+			       field3 & TRB_CHAIN ? 'C' : 'c',
+			       field3 & TRB_TC ? 'T' : 't',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_TRANSFER:
+	case TRB_COMPLETION:
+	case TRB_PORT_STATUS:
+	case TRB_HC_EVENT:
+		ret = snprintf(str, size,
+			       "ep%d%s(%d) type '%s' TRB %08x%08x status '%s'"
+			       " len %ld slot %ld flags %c:%c",
+			       ep_num, ep_id % 2 ? "out" : "in",
+			       TRB_TO_EP_INDEX(field3),
+			       cdnsp_trb_type_string(type), field1, field0,
+			       cdnsp_trb_comp_code_string(GET_COMP_CODE(field2)),
+			       EVENT_TRB_LEN(field2), TRB_TO_SLOT_ID(field3),
+			       field3 & EVENT_DATA ? 'E' : 'e',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_MFINDEX_WRAP:
+		ret = snprintf(str, size, "%s: flags %c",
+			       cdnsp_trb_type_string(type),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_SETUP:
+		ret = snprintf(str, size,
+			       "type '%s' bRequestType %02x bRequest %02x "
+			       "wValue %02x%02x wIndex %02x%02x wLength %d "
+			       "length %ld TD size %ld intr %ld Setup ID %ld "
+			       "flags %c:%c:%c",
+			       cdnsp_trb_type_string(type),
+			       field0 & 0xff,
+			       (field0 & 0xff00) >> 8,
+			       (field0 & 0xff000000) >> 24,
+			       (field0 & 0xff0000) >> 16,
+			       (field1 & 0xff00) >> 8,
+			       field1 & 0xff,
+			       (field1 & 0xff000000) >> 16 |
+			       (field1 & 0xff0000) >> 16,
+			       TRB_LEN(field2), GET_TD_SIZE(field2),
+			       GET_INTR_TARGET(field2),
+			       TRB_SETUPID_TO_TYPE(field3),
+			       field3 & TRB_IDT ? 'D' : 'd',
+			       field3 & TRB_IOC ? 'I' : 'i',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_DATA:
+		ret = snprintf(str, size,
+			       "type '%s' Buffer %08x%08x length %ld TD size %ld "
+			       "intr %ld flags %c:%c:%c:%c:%c:%c:%c",
+			       cdnsp_trb_type_string(type),
+			       field1, field0, TRB_LEN(field2),
+			       GET_TD_SIZE(field2),
+			       GET_INTR_TARGET(field2),
+			       field3 & TRB_IDT ? 'D' : 'i',
+			       field3 & TRB_IOC ? 'I' : 'i',
+			       field3 & TRB_CHAIN ? 'C' : 'c',
+			       field3 & TRB_NO_SNOOP ? 'S' : 's',
+			       field3 & TRB_ISP ? 'I' : 'i',
+			       field3 & TRB_ENT ? 'E' : 'e',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_STATUS:
+		ret = snprintf(str, size,
+			       "Buffer %08x%08x length %ld TD size %ld intr"
+			       "%ld type '%s' flags %c:%c:%c:%c",
+			       field1, field0, TRB_LEN(field2),
+			       GET_TD_SIZE(field2),
+			       GET_INTR_TARGET(field2),
+			       cdnsp_trb_type_string(type),
+			       field3 & TRB_IOC ? 'I' : 'i',
+			       field3 & TRB_CHAIN ? 'C' : 'c',
+			       field3 & TRB_ENT ? 'E' : 'e',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_NORMAL:
+	case TRB_ISOC:
+	case TRB_EVENT_DATA:
+	case TRB_TR_NOOP:
+		ret = snprintf(str, size,
+			       "type '%s' Buffer %08x%08x length %ld "
+			       "TD size %ld intr %ld "
+			       "flags %c:%c:%c:%c:%c:%c:%c:%c:%c",
+			       cdnsp_trb_type_string(type),
+			       field1, field0, TRB_LEN(field2),
+			       GET_TD_SIZE(field2),
+			       GET_INTR_TARGET(field2),
+			       field3 & TRB_BEI ? 'B' : 'b',
+			       field3 & TRB_IDT ? 'T' : 't',
+			       field3 & TRB_IOC ? 'I' : 'i',
+			       field3 & TRB_CHAIN ? 'C' : 'c',
+			       field3 & TRB_NO_SNOOP ? 'S' : 's',
+			       field3 & TRB_ISP ? 'I' : 'i',
+			       field3 & TRB_ENT ? 'E' : 'e',
+			       field3 & TRB_CYCLE ? 'C' : 'c',
+			       !(field3 & TRB_EVENT_INVALIDATE) ? 'V' : 'v');
+		break;
+	case TRB_CMD_NOOP:
+	case TRB_ENABLE_SLOT:
+		ret = snprintf(str, size, "%s: flags %c",
+			       cdnsp_trb_type_string(type),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_DISABLE_SLOT:
+		ret = snprintf(str, size, "%s: slot %ld flags %c",
+			       cdnsp_trb_type_string(type),
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_ADDR_DEV:
+		ret = snprintf(str, size,
+			       "%s: ctx %08x%08x slot %ld flags %c:%c",
+			       cdnsp_trb_type_string(type), field1, field0,
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_BSR ? 'B' : 'b',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_CONFIG_EP:
+		ret = snprintf(str, size,
+			       "%s: ctx %08x%08x slot %ld flags %c:%c",
+			       cdnsp_trb_type_string(type), field1, field0,
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_DC ? 'D' : 'd',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_EVAL_CONTEXT:
+		ret = snprintf(str, size,
+			       "%s: ctx %08x%08x slot %ld flags %c",
+			       cdnsp_trb_type_string(type), field1, field0,
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_RESET_EP:
+	case TRB_HALT_ENDPOINT:
+	case TRB_FLUSH_ENDPOINT:
+		ret = snprintf(str, size,
+			       "%s: ep%d%s(%d) ctx %08x%08x slot %ld flags %c",
+			       cdnsp_trb_type_string(type),
+			       ep_num, ep_id % 2 ? "out" : "in",
+			       TRB_TO_EP_INDEX(field3), field1, field0,
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_STOP_RING:
+		ret = snprintf(str, size,
+			       "%s: ep%d%s(%d) slot %ld sp %d flags %c",
+			       cdnsp_trb_type_string(type),
+			       ep_num, ep_id % 2 ? "out" : "in",
+			       TRB_TO_EP_INDEX(field3),
+			       TRB_TO_SLOT_ID(field3),
+			       TRB_TO_SUSPEND_PORT(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_SET_DEQ:
+		ret = snprintf(str, size,
+			       "%s: ep%d%s(%d) deq %08x%08x stream %ld slot %ld  flags %c",
+			       cdnsp_trb_type_string(type),
+			       ep_num, ep_id % 2 ? "out" : "in",
+			       TRB_TO_EP_INDEX(field3), field1, field0,
+			       TRB_TO_STREAM_ID(field2),
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_RESET_DEV:
+		ret = snprintf(str, size, "%s: slot %ld flags %c",
+			       cdnsp_trb_type_string(type),
+			       TRB_TO_SLOT_ID(field3),
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	case TRB_ENDPOINT_NRDY:
+		temp = TRB_TO_HOST_STREAM(field2);
+
+		ret = snprintf(str, size,
+			       "%s: ep%d%s(%d) H_SID %x%s%s D_SID %lx flags %c:%c",
+			       cdnsp_trb_type_string(type),
+			       ep_num, ep_id % 2 ? "out" : "in",
+			       TRB_TO_EP_INDEX(field3), temp,
+			       temp == STREAM_PRIME_ACK ? "(PRIME)" : "",
+			       temp == STREAM_REJECTED ? "(REJECTED)" : "",
+			       TRB_TO_DEV_STREAM(field0),
+			       field3 & TRB_STAT ? 'S' : 's',
+			       field3 & TRB_CYCLE ? 'C' : 'c');
+		break;
+	default:
+		ret = snprintf(str, size,
+			       "type '%s' -> raw %08x %08x %08x %08x",
+			       cdnsp_trb_type_string(type),
+			       field0, field1, field2, field3);
+	}
+
+	if (ret >= size)
+		pr_info("CDNSP: buffer overflowed.\n");
+
+	return str;
+}
+
+static inline const char *cdnsp_decode_slot_context(u32 info, u32 info2,
+						    u32 int_target, u32 state)
+{
+	static char str[1024];
+	int ret = 0;
+	u32 speed;
+	char *s;
+
+	speed = info & DEV_SPEED;
+
+	switch (speed) {
+	case SLOT_SPEED_FS:
+		s = "full-speed";
+		break;
+	case SLOT_SPEED_HS:
+		s = "high-speed";
+		break;
+	case SLOT_SPEED_SS:
+		s = "super-speed";
+		break;
+	case SLOT_SPEED_SSP:
+		s = "super-speed plus";
+		break;
+	default:
+		s = "UNKNOWN speed";
+	}
+
+	ret = sprintf(str, "%s Ctx Entries %d",
+		      s, (info & LAST_CTX_MASK) >> 27);
+
+	ret += sprintf(str + ret, " [Intr %ld] Addr %ld State %s",
+		       GET_INTR_TARGET(int_target), state & DEV_ADDR_MASK,
+		       cdnsp_slot_state_string(GET_SLOT_STATE(state)));
+
+	return str;
+}
+
+static inline const char *cdnsp_portsc_link_state_string(u32 portsc)
+{
+	switch (portsc & PORT_PLS_MASK) {
+	case XDEV_U0:
+		return "U0";
+	case XDEV_U1:
+		return "U1";
+	case XDEV_U2:
+		return "U2";
+	case XDEV_U3:
+		return "U3";
+	case XDEV_DISABLED:
+		return "Disabled";
+	case XDEV_RXDETECT:
+		return "RxDetect";
+	case XDEV_INACTIVE:
+		return "Inactive";
+	case XDEV_POLLING:
+		return "Polling";
+	case XDEV_RECOVERY:
+		return "Recovery";
+	case XDEV_HOT_RESET:
+		return "Hot Reset";
+	case XDEV_COMP_MODE:
+		return "Compliance mode";
+	case XDEV_TEST_MODE:
+		return "Test mode";
+	case XDEV_RESUME:
+		return "Resume";
+	default:
+		break;
+	}
+
+	return "Unknown";
+}
+
+static inline const char *cdnsp_decode_portsc(char *str, size_t size,
+					      u32 portsc)
+{
+	int ret;
+
+	ret = snprintf(str, size, "%s %s %s Link:%s PortSpeed:%d ",
+		       portsc & PORT_POWER ? "Powered" : "Powered-off",
+		       portsc & PORT_CONNECT ? "Connected" : "Not-connected",
+		       portsc & PORT_PED ? "Enabled" : "Disabled",
+		       cdnsp_portsc_link_state_string(portsc),
+		       DEV_PORT_SPEED(portsc));
+
+	if (portsc & PORT_RESET)
+		ret += snprintf(str + ret, size - ret, "In-Reset ");
+
+	ret += snprintf(str + ret, size - ret, "Change: ");
+	if (portsc & PORT_CSC)
+		ret += snprintf(str + ret, size - ret, "CSC ");
+	if (portsc & PORT_WRC)
+		ret += snprintf(str + ret, size - ret, "WRC ");
+	if (portsc & PORT_RC)
+		ret += snprintf(str + ret, size - ret, "PRC ");
+	if (portsc & PORT_PLC)
+		ret += snprintf(str + ret, size - ret, "PLC ");
+	if (portsc & PORT_CEC)
+		ret += snprintf(str + ret, size - ret, "CEC ");
+	ret += snprintf(str + ret, size - ret, "Wake: ");
+	if (portsc & PORT_WKCONN_E)
+		ret += snprintf(str + ret, size - ret, "WCE ");
+	if (portsc & PORT_WKDISC_E)
+		ret += snprintf(str + ret, size - ret, "WDE ");
+
+	return str;
+}
+
+static inline const char *cdnsp_ep_state_string(u8 state)
+{
+	switch (state) {
+	case EP_STATE_DISABLED:
+		return "disabled";
+	case EP_STATE_RUNNING:
+		return "running";
+	case EP_STATE_HALTED:
+		return "halted";
+	case EP_STATE_STOPPED:
+		return "stopped";
+	case EP_STATE_ERROR:
+		return "error";
+	default:
+		return "INVALID";
+	}
+}
+
+static inline const char *cdnsp_ep_type_string(u8 type)
+{
+	switch (type) {
+	case ISOC_OUT_EP:
+		return "Isoc OUT";
+	case BULK_OUT_EP:
+		return "Bulk OUT";
+	case INT_OUT_EP:
+		return "Int OUT";
+	case CTRL_EP:
+		return "Ctrl";
+	case ISOC_IN_EP:
+		return "Isoc IN";
+	case BULK_IN_EP:
+		return "Bulk IN";
+	case INT_IN_EP:
+		return "Int IN";
+	default:
+		return "INVALID";
+	}
+}
+
+static inline const char *cdnsp_decode_ep_context(char *str, size_t size,
+						  u32 info, u32 info2,
+						  u64 deq, u32 tx_info)
+{
+	u8 max_pstr, ep_state, interval, ep_type, burst, cerr, mult;
+	bool lsa, hid;
+	u16 maxp, avg;
+	u32 esit;
+	int ret;
+
+	esit = CTX_TO_MAX_ESIT_PAYLOAD_HI(info) << 16 |
+	       CTX_TO_MAX_ESIT_PAYLOAD_LO(tx_info);
+
+	ep_state = info & EP_STATE_MASK;
+	max_pstr = CTX_TO_EP_MAXPSTREAMS(info);
+	interval = CTX_TO_EP_INTERVAL(info);
+	mult = CTX_TO_EP_MULT(info) + 1;
+	lsa = !!(info & EP_HAS_LSA);
+
+	cerr = (info2 & (3 << 1)) >> 1;
+	ep_type = CTX_TO_EP_TYPE(info2);
+	hid = !!(info2 & (1 << 7));
+	burst = CTX_TO_MAX_BURST(info2);
+	maxp = MAX_PACKET_DECODED(info2);
+
+	avg = EP_AVG_TRB_LENGTH(tx_info);
+
+	ret = snprintf(str, size, "State %s mult %d max P. Streams %d %s",
+		       cdnsp_ep_state_string(ep_state), mult,
+		       max_pstr, lsa ? "LSA " : "");
+
+	ret += snprintf(str + ret, size - ret,
+			"interval %d us max ESIT payload %d CErr %d ",
+			(1 << interval) * 125, esit, cerr);
+
+	ret += snprintf(str + ret, size - ret,
+			"Type %s %sburst %d maxp %d deq %016llx ",
+			cdnsp_ep_type_string(ep_type), hid ? "HID" : "",
+			burst, maxp, deq);
+
+	ret += snprintf(str + ret, size - ret, "avg trb len %d", avg);
+
+	return str;
+}
+
+#endif /*__LINUX_CDNSP_DEBUG*/
diff --git a/drivers/usb/cdns3/cdnsp-ep0.c b/drivers/usb/cdns3/cdnsp-ep0.c
new file mode 100644
index 0000000000..f317d3c847
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-ep0.c
@@ -0,0 +1,471 @@
+// 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"
+#include "cdnsp-trace.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:
+		trace_cdnsp_ep0_set_config("from Address state");
+		break;
+	case USB_STATE_CONFIGURED:
+		trace_cdnsp_ep0_set_config("from Configured state");
+		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(u16 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:
+		ep_sts = cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex));
+		pep = &pdev->eps[ep_sts];
+		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;
+		trace_cdnsp_may_wakeup(set);
+		break;
+	case USB_DEVICE_U1_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
+			return -EINVAL;
+
+		pdev->u1_allowed = !!set;
+		trace_cdnsp_u1(set);
+		break;
+	case USB_DEVICE_U2_ENABLE:
+		if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
+			return -EINVAL;
+
+		pdev->u2_allowed = !!set;
+		trace_cdnsp_u2(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;
+	u16 wValue;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	pep = &pdev->eps[cdnsp_w_index_to_ep_index(le16_to_cpu(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;
+	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 = -EINVAL;
+	u16 len;
+
+	trace_cdnsp_ctrl_req(ctrl);
+
+	if (!pdev->gadget_driver)
+		goto out;
+
+	if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
+		dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
+		goto out;
+	}
+
+	/* Restore the ep0 to Stopped/Running state. */
+	if (pdev->eps[0].ep_state & EP_HALTED) {
+		trace_cdnsp_ep0_halted("Restore to normal state");
+		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;
+
+		trace_cdnsp_ep0_request("Remove previous");
+		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 (ret == USB_GADGET_DELAYED_STATUS) {
+		trace_cdnsp_ep0_status_stage("delayed");
+		return;
+	}
+out:
+	if (ret < 0)
+		cdnsp_ep0_stall(pdev);
+	else if (!len && 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 0000000000..4b67749edb
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -0,0 +1,2029 @@
+// 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"
+#include "cdnsp-trace.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);
+}
+
+/**
+ * cdnsp_find_next_ext_cap - 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)
+{
+	int port_num = 0xFF;
+	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;
+
+	if (pdev->active_port)
+		port_num = pdev->active_port->port_num;
+
+	trace_cdnsp_handle_port_status(port_num, readl(port_regs));
+	writel(temp, port_regs);
+	trace_cdnsp_link_state_changed(port_num, readl(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)) {
+		trace_cdnsp_request_enqueue_busy(preq);
+		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) {
+		trace_cdnsp_request_enqueue_error(preq);
+		return ret;
+	}
+
+	list_add_tail(&preq->list, &pep->pending_list);
+
+	trace_cdnsp_request_enqueue(preq);
+
+	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(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);
+	trace_cdnsp_request_enqueue_error(preq);
+
+	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_stop = 0;
+	int ret_rem;
+
+	trace_cdnsp_request_dequeue(preq);
+
+	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING)
+		ret_stop = cdnsp_cmd_stop_ep(pdev, pep);
+
+	ret_rem = cdnsp_remove_request(pdev, preq, pep);
+
+	return ret_rem ? ret_rem : ret_stop;
+}
+
+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;
+	u32  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;
+	int ret, val;
+	u64 cmd_dma;
+	u32  flags;
+
+	cmd_trb = pdev->cmd.command_trb;
+	pdev->cmd.status = 0;
+
+	trace_cdnsp_cmd_wait_for_compl(pdev->cmd_ring, &cmd_trb->generic);
+
+	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");
+		trace_cdnsp_cmd_timeout(pdev->cmd_ring, &cmd_trb->generic);
+		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;
+		}
+
+		trace_cdnsp_handle_command(pdev->cmd_ring, &cmd_trb->generic);
+
+		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;
+
+	trace_cdnsp_ep_halt(value ? "Set" : "Clear");
+
+	ret = cdnsp_cmd_stop_ep(pdev, pep);
+	if (ret)
+		return ret;
+
+	if (value) {
+		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 {
+		cdnsp_queue_reset_ep(pdev, pep->idx);
+		cdnsp_ring_cmd_db(pdev);
+		ret = cdnsp_wait_for_cmd_compl(pdev);
+		trace_cdnsp_handle_cmd_reset_ep(pep->out_ctx);
+
+		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);
+
+	trace_cdnsp_configure_endpoint(cdnsp_get_slot_ctx(&pdev->out_ctx));
+	trace_cdnsp_handle_cmd_config_ep(pep->out_ctx);
+
+	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));
+	trace_cdnsp_reset_device(slot_ctx);
+
+	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 | EP_UNCONFIGURED;
+
+	trace_cdnsp_handle_cmd_reset_dev(slot_ctx);
+
+	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);
+
+	trace_cdnsp_stream_number(pep, num_stream_ctxs, 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;
+
+	trace_cdnsp_handle_cmd_disable_slot(cdnsp_get_slot_ctx(&pdev->out_ctx));
+
+	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)
+		goto show_trace;
+
+	pdev->slot_id = 1;
+
+show_trace:
+	trace_cdnsp_handle_cmd_enable_slot(cdnsp_get_slot_ctx(&pdev->out_ctx));
+
+	return ret;
+}
+
+/*
+ * 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) {
+		trace_cdnsp_slot_id("incorrect");
+		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) {
+		trace_cdnsp_slot_already_in_default(slot_ctx);
+		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;
+
+	trace_cdnsp_setup_device_slot(slot_ctx);
+
+	cdnsp_queue_address_device(pdev, pdev->in_ctx.dma, setup);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	trace_cdnsp_handle_cmd_addr_dev(cdnsp_get_slot_ctx(&pdev->out_ctx));
+
+	/* 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;
+
+	trace_cdnsp_lpm(enable);
+
+	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;
+	pep->ep_state &= ~EP_UNCONFIGURED;
+
+	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:
+	trace_cdnsp_ep_enable_end(pep, 0);
+	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;
+	}
+
+	pep->ep_state |= EP_DIS_IN_RROGRESS;
+
+	/* Endpoint was unconfigured by Reset Device command. */
+	if (!(pep->ep_state & EP_UNCONFIGURED)) {
+		cdnsp_cmd_stop_ep(pdev, pep);
+		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);
+
+	if (!(pep->ep_state & EP_UNCONFIGURED))
+		ret = cdnsp_update_eps_configuration(pdev, pep);
+
+	cdnsp_free_endpoint_rings(pdev, pep);
+
+	pep->ep_state &= ~(EP_ENABLED | EP_UNCONFIGURED);
+	pep->ep_state |= EP_STOPPED;
+
+finish:
+	trace_cdnsp_ep_disable_end(pep, 0);
+	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;
+
+	trace_cdnsp_alloc_request(preq);
+
+	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);
+
+	trace_cdnsp_free_request(preq);
+	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 (request->status != -EINPROGRESS)
+		return 0;
+
+	if (!pep->endpoint.desc) {
+		dev_err(pdev->dev,
+			"%s: can't dequeue to disabled endpoint\n",
+			pep->name);
+		return -ESHUTDOWN;
+	}
+
+	/* Requests has been dequeued during disabling endpoint. */
+	if (!(pep->ep_state & EP_ENABLED))
+		return 0;
+
+	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;
+	int ret;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	preq = next_request(&pep->pending_list);
+	if (value) {
+		if (preq) {
+			trace_cdnsp_ep_busy_try_halt_again(pep, 0);
+			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;
+	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);
+
+	trace_cdnsp_request_giveback(preq);
+
+	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;
+	u32 temp;
+	int ret;
+
+	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);
+
+	trace_cdnsp_init("Controller ready to work");
+	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);
+
+	trace_cdnsp_exit("Controller stopped.");
+}
+
+/*
+ * 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);
+	unsigned long flags;
+
+	trace_cdnsp_pullup(is_on);
+
+	/*
+	 * Disable events handling while controller is being
+	 * enabled/disabled.
+	 */
+	disable_irq(cdns->dev_irq);
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	if (!is_on) {
+		cdnsp_reset_device(pdev);
+		cdns_clear_vbus(cdns);
+	} else {
+		cdns_set_vbus(cdns);
+	}
+
+	spin_unlock_irqrestore(&pdev->lock, flags);
+	enable_irq(cdns->dev_irq);
+
+	return 0;
+}
+
+static 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(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;
+
+	reg += cdnsp_find_next_ext_cap(reg, 0, RTL_REV_CAP);
+	pdev->rev_cap  = reg;
+
+	dev_info(pdev->dev, "Rev: %08x/%08x, eps: %08x, buff: %08x/%08x\n",
+		 readl(&pdev->rev_cap->ctrl_revision),
+		 readl(&pdev->rev_cap->rtl_revision),
+		 readl(&pdev->rev_cap->ep_supported),
+		 readl(&pdev->rev_cap->rx_buff_size),
+		 readl(&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);
+	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 = max_speed;
+	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
new file mode 100644
index 0000000000..e1b5801fdd
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-gadget.h
@@ -0,0 +1,1602 @@
+/* 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.
+ */
+#ifndef __LINUX_CDNSP_GADGET_H
+#define __LINUX_CDNSP_GADGET_H
+
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/usb/gadget.h>
+#include <linux/irq.h>
+
+/* Max number slots - only 1 is allowed. */
+#define CDNSP_DEV_MAX_SLOTS	1
+
+#define CDNSP_EP0_SETUP_SIZE	512
+
+/* One control and 15 for in and 15 for out endpoints. */
+#define CDNSP_ENDPOINTS_NUM	31
+
+/* Best Effort Service Latency. */
+#define CDNSP_DEFAULT_BESL	0
+
+/* Device Controller command default timeout value in us */
+#define CDNSP_CMD_TIMEOUT	(15 * 1000)
+
+/* Up to 16 ms to halt an device controller */
+#define CDNSP_MAX_HALT_USEC	(16 * 1000)
+
+#define CDNSP_CTX_SIZE	2112
+
+/*
+ * Controller register interface.
+ */
+
+/**
+ * struct cdnsp_cap_regs - CDNSP Registers.
+ * @hc_capbase:	Length of the capabilities register and controller
+ *              version number
+ * @hcs_params1: HCSPARAMS1 - Structural Parameters 1
+ * @hcs_params2: HCSPARAMS2 - Structural Parameters 2
+ * @hcs_params3: HCSPARAMS3 - Structural Parameters 3
+ * @hcc_params: HCCPARAMS - Capability Parameters
+ * @db_off: DBOFF - Doorbell array offset
+ * @run_regs_off: RTSOFF - Runtime register space offset
+ * @hcc_params2: HCCPARAMS2 Capability Parameters 2,
+ */
+struct cdnsp_cap_regs {
+	__le32 hc_capbase;
+	__le32 hcs_params1;
+	__le32 hcs_params2;
+	__le32 hcs_params3;
+	__le32 hcc_params;
+	__le32 db_off;
+	__le32 run_regs_off;
+	__le32 hcc_params2;
+	/* Reserved up to (CAPLENGTH - 0x1C) */
+};
+
+/* hc_capbase bitmasks. */
+/* bits 7:0 - how long is the Capabilities register. */
+#define HC_LENGTH(p)		(((p) >> 00) & GENMASK(7, 0))
+/* bits 31:16	*/
+#define HC_VERSION(p)		(((p) >> 16) & GENMASK(15, 1))
+
+/* HCSPARAMS1 - hcs_params1 - bitmasks */
+/* bits 0:7, Max Device Endpoints */
+#define HCS_ENDPOINTS_MASK	GENMASK(7, 0)
+#define HCS_ENDPOINTS(p)	(((p) & HCS_ENDPOINTS_MASK) >> 0)
+
+/* HCCPARAMS offset from PCI base address */
+#define HCC_PARAMS_OFFSET	0x10
+
+/* HCCPARAMS - hcc_params - bitmasks */
+/* 1: device controller can use 64-bit address pointers. */
+#define HCC_64BIT_ADDR(p)	((p) & BIT(0))
+/* 1: device controller uses 64-byte Device Context structures. */
+#define HCC_64BYTE_CONTEXT(p)	((p) & BIT(2))
+/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15. */
+#define HCC_MAX_PSA(p)		((((p) >> 12) & 0xf) + 1)
+/* Extended Capabilities pointer from PCI base. */
+#define HCC_EXT_CAPS(p)		(((p) & GENMASK(31, 16)) >> 16)
+
+#define CTX_SIZE(_hcc)		(HCC_64BYTE_CONTEXT(_hcc) ? 64 : 32)
+
+/* db_off bitmask - bits 0:1 reserved. */
+#define DBOFF_MASK	GENMASK(31, 2)
+
+/* run_regs_off bitmask - bits 0:4 reserved. */
+#define RTSOFF_MASK	GENMASK(31, 5)
+
+/**
+ * struct cdnsp_op_regs - Device Controller Operational Registers.
+ * @command: USBCMD - Controller command register.
+ * @status: USBSTS - Controller status register.
+ * @page_size: This indicates the page size that the device controller supports.
+ *             If bit n is set, the controller supports a page size of 2^(n+12),
+ *             up to a 128MB page size. 4K is the minimum page size.
+ * @dnctrl: DNCTRL - Device notification control register.
+ * @cmd_ring: CRP - 64-bit Command Ring Pointer.
+ * @dcbaa_ptr: DCBAAP - 64-bit Device Context Base Address Array Pointer.
+ * @config_reg: CONFIG - Configure Register
+ * @port_reg_base: PORTSCn - base address for Port Status and Control
+ *                 Each port has a Port Status and Control register,
+ *                 followed by a Port Power Management Status and Control
+ *                 register, a Port Link Info register, and a reserved
+ *                 register.
+ */
+struct cdnsp_op_regs {
+	__le32 command;
+	__le32 status;
+	__le32 page_size;
+	__le32 reserved1;
+	__le32 reserved2;
+	__le32 dnctrl;
+	__le64 cmd_ring;
+	/* rsvd: offset 0x20-2F. */
+	__le32 reserved3[4];
+	__le64 dcbaa_ptr;
+	__le32 config_reg;
+	/* rsvd: offset 0x3C-3FF. */
+	__le32 reserved4[241];
+	/* port 1 registers, which serve as a base address for other ports. */
+	__le32 port_reg_base;
+};
+
+/* Number of registers per port. */
+#define NUM_PORT_REGS	4
+
+/**
+ * struct cdnsp_port_regs - Port Registers.
+ * @portsc: PORTSC - Port Status and Control Register.
+ * @portpmsc: PORTPMSC - Port Power Managements Status and Control Register.
+ * @portli: PORTLI - Port Link Info register.
+ */
+struct cdnsp_port_regs {
+	__le32 portsc;
+	__le32 portpmsc;
+	__le32 portli;
+	__le32 reserved;
+};
+
+/*
+ * These bits are Read Only (RO) and should be saved and written to the
+ * registers: 0 (connect status) and  10:13 (port speed).
+ * These bits are also sticky - meaning they're in the AUX well and they aren't
+ * changed by a hot and warm.
+ */
+#define CDNSP_PORT_RO	(PORT_CONNECT | DEV_SPEED_MASK)
+
+/*
+ * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
+ * bits 5:8 (link state), 25:26  ("wake on" enable state)
+ */
+#define CDNSP_PORT_RWS	(PORT_PLS_MASK | PORT_WKCONN_E | PORT_WKDISC_E)
+
+/*
+ * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
+ * bits 1 (port enable/disable), 17  ( connect changed),
+ * 21 (port reset changed) , 22 (Port Link State Change),
+ */
+#define CDNSP_PORT_RW1CS (PORT_PED | PORT_CSC | PORT_RC | PORT_PLC)
+
+/* USBCMD - USB command - bitmasks. */
+/* Run/Stop, controller execution - do not write unless controller is halted.*/
+#define CMD_R_S		BIT(0)
+/*
+ * Reset device controller - resets internal controller state machine and all
+ * registers (except PCI config regs).
+ */
+#define CMD_RESET	BIT(1)
+/* Event Interrupt Enable - a '1' allows interrupts from the controller. */
+#define CMD_INTE	BIT(2)
+/*
+ * Device System Error Interrupt Enable - get out-of-band signal for
+ * controller errors.
+ */
+#define CMD_DSEIE	BIT(3)
+/* device controller save/restore state. */
+#define CMD_CSS		BIT(8)
+#define CMD_CRS		BIT(9)
+/*
+ * Enable Wrap Event - '1' means device controller generates an event
+ * when MFINDEX wraps.
+ */
+#define CMD_EWE		BIT(10)
+/* 1: device enabled */
+#define CMD_DEVEN	BIT(17)
+/* bits 18:31 are reserved (and should be preserved on writes). */
+
+/* Command register values to disable interrupts. */
+#define CDNSP_IRQS	(CMD_INTE | CMD_DSEIE | CMD_EWE)
+
+/* USBSTS - USB status - bitmasks */
+/* controller not running - set to 1 when run/stop bit is cleared. */
+#define STS_HALT	BIT(0)
+/*
+ * serious error, e.g. PCI parity error. The controller will clear
+ * the run/stop bit.
+ */
+#define STS_FATAL	BIT(2)
+/* event interrupt - clear this prior to clearing any IP flags in IR set.*/
+#define STS_EINT	BIT(3)
+/* port change detect */
+#define STS_PCD		BIT(4)
+/* save state status - '1' means device controller is saving state. */
+#define STS_SSS		BIT(8)
+/* restore state status - '1' means controllers is restoring state. */
+#define STS_RSS		BIT(9)
+/* 1: save or restore error */
+#define STS_SRE		BIT(10)
+/* 1: device Not Ready to accept doorbell or op reg writes after reset. */
+#define STS_CNR		BIT(11)
+/* 1: internal Device Controller Error.*/
+#define STS_HCE		BIT(12)
+
+/* CRCR - Command Ring Control Register - cmd_ring bitmasks. */
+/* bit 0 is the command ring cycle state. */
+#define CMD_RING_CS		BIT(0)
+/* stop ring immediately - abort the currently executing command. */
+#define CMD_RING_ABORT		BIT(2)
+/*
+ * Command Ring Busy.
+ * Set when Doorbell register is written with DB for command and cleared when
+ * the controller reached end of CR.
+ */
+#define CMD_RING_BUSY(p)	((p) & BIT(4))
+/* 1: command ring is running */
+#define CMD_RING_RUNNING	BIT(3)
+/* Command Ring pointer - bit mask for the lower 32 bits. */
+#define CMD_RING_RSVD_BITS	GENMASK(5, 0)
+
+/* CONFIG - Configure Register - config_reg bitmasks. */
+/* bits 0:7 - maximum number of device slots enabled. */
+#define MAX_DEVS		GENMASK(7, 0)
+/* bit 8: U3 Entry Enabled, assert PLC when controller enters U3. */
+#define CONFIG_U3E		BIT(8)
+
+/* PORTSC - Port Status and Control Register - port_reg_base bitmasks */
+/* 1: device connected. */
+#define PORT_CONNECT		BIT(0)
+/* 1: port enabled. */
+#define PORT_PED		BIT(1)
+/* 1: port reset signaling asserted. */
+#define PORT_RESET		BIT(4)
+/*
+ * Port Link State - bits 5:8
+ * A read gives the current link PM state of the port,
+ * a write with Link State Write Strobe sets the link state.
+ */
+#define PORT_PLS_MASK		GENMASK(8, 5)
+#define XDEV_U0			(0x0 << 5)
+#define XDEV_U1			(0x1 << 5)
+#define XDEV_U2			(0x2 << 5)
+#define XDEV_U3			(0x3 << 5)
+#define XDEV_DISABLED		(0x4 << 5)
+#define XDEV_RXDETECT		(0x5 << 5)
+#define XDEV_INACTIVE		(0x6 << 5)
+#define XDEV_POLLING		(0x7 << 5)
+#define XDEV_RECOVERY		(0x8 << 5)
+#define XDEV_HOT_RESET		(0x9 << 5)
+#define XDEV_COMP_MODE		(0xa << 5)
+#define XDEV_TEST_MODE		(0xb << 5)
+#define XDEV_RESUME		(0xf << 5)
+/* 1: port has power. */
+#define PORT_POWER		BIT(9)
+/*
+ * bits 10:13 indicate device speed:
+ * 0 - undefined speed - port hasn't be initialized by a reset yet
+ * 1 - full speed
+ * 2 - Reserved (Low Speed not supported
+ * 3 - high speed
+ * 4 - super speed
+ * 5 - super speed
+ * 6-15 reserved
+ */
+#define DEV_SPEED_MASK		GENMASK(13, 10)
+#define XDEV_FS			(0x1 << 10)
+#define XDEV_HS			(0x3 << 10)
+#define XDEV_SS			(0x4 << 10)
+#define XDEV_SSP		(0x5 << 10)
+#define DEV_UNDEFSPEED(p)	(((p) & DEV_SPEED_MASK) == (0x0 << 10))
+#define DEV_FULLSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_FS)
+#define DEV_HIGHSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_HS)
+#define DEV_SUPERSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_SS)
+#define DEV_SUPERSPEEDPLUS(p)	(((p) & DEV_SPEED_MASK) == XDEV_SSP)
+#define DEV_SUPERSPEED_ANY(p)	(((p) & DEV_SPEED_MASK) >= XDEV_SS)
+#define DEV_PORT_SPEED(p)	(((p) >> 10) & 0x0f)
+/* Port Link State Write Strobe - set this when changing link state */
+#define PORT_LINK_STROBE	BIT(16)
+/* 1: connect status change */
+#define PORT_CSC		BIT(17)
+/* 1: warm reset for a USB 3.0 device is done. */
+#define PORT_WRC		BIT(19)
+/* 1: reset change - 1 to 0 transition of PORT_RESET */
+#define PORT_RC			BIT(21)
+/*
+ * port link status change - set on some port link state transitions:
+ * Transition			Reason
+ * ----------------------------------------------------------------------------
+ * - U3 to Resume		Wakeup signaling from a device
+ * - Resume to Recovery to U0	USB 3.0 device resume
+ * - Resume to U0		USB 2.0 device resume
+ * - U3 to Recovery to U0	Software resume of USB 3.0 device complete
+ * - U3 to U0			Software resume of USB 2.0 device complete
+ * - U2 to U0			L1 resume of USB 2.1 device complete
+ * - U0 to U0			L1 entry rejection by USB 2.1 device
+ * - U0 to disabled		L1 entry error with USB 2.1 device
+ * - Any state to inactive	Error on USB 3.0 port
+ */
+#define PORT_PLC		BIT(22)
+/* Port configure error change - port failed to configure its link partner. */
+#define PORT_CEC		BIT(23)
+/* Wake on connect (enable). */
+#define PORT_WKCONN_E		BIT(25)
+/* Wake on disconnect (enable). */
+#define PORT_WKDISC_E		BIT(26)
+/* Indicates if Warm Reset is being received. */
+#define PORT_WR			BIT(31)
+
+#define PORT_CHANGE_BITS (PORT_CSC | PORT_WRC | PORT_RC | PORT_PLC | PORT_CEC)
+
+/* PORTPMSCUSB3 - Port Power Management Status and Control - bitmasks. */
+/*  Enables U1 entry. */
+#define PORT_U1_TIMEOUT_MASK	GENMASK(7, 0)
+#define PORT_U1_TIMEOUT(p)	((p) & PORT_U1_TIMEOUT_MASK)
+/* Enables U2 entry .*/
+#define PORT_U2_TIMEOUT_MASK	GENMASK(14, 8)
+#define PORT_U2_TIMEOUT(p)	(((p) << 8) & PORT_U2_TIMEOUT_MASK)
+
+/* PORTPMSCUSB2 - Port Power Management Status and Control - bitmasks. */
+#define PORT_L1S_MASK		GENMASK(2, 0)
+#define PORT_L1S(p)		((p) & PORT_L1S_MASK)
+#define PORT_L1S_ACK		PORT_L1S(1)
+#define PORT_L1S_NYET		PORT_L1S(2)
+#define PORT_L1S_STALL		PORT_L1S(3)
+#define PORT_L1S_TIMEOUT	PORT_L1S(4)
+/* Remote Wake Enable. */
+#define PORT_RWE		BIT(3)
+/* Best Effort Service Latency (BESL). */
+#define PORT_BESL(p)		(((p) << 4) & GENMASK(7, 4))
+/* Hardware LPM Enable (HLE). */
+#define PORT_HLE		BIT(16)
+/* Received Best Effort Service Latency (BESL). */
+#define PORT_RRBESL(p)		(((p) & GENMASK(20, 17)) >> 17)
+/* Port Test Control. */
+#define PORT_TEST_MODE_MASK	GENMASK(31, 28)
+#define PORT_TEST_MODE(p)	(((p) << 28) & PORT_TEST_MODE_MASK)
+
+/**
+ * struct cdnsp_intr_reg - Interrupt Register Set.
+ * @irq_pending: IMAN - Interrupt Management Register. Used to enable
+ *               interrupts and check for pending interrupts.
+ * @irq_control: IMOD - Interrupt Moderation Register.
+ *               Used to throttle interrupts.
+ * @erst_size: Number of segments in the Event Ring Segment Table (ERST).
+ * @erst_base: ERST base address.
+ * @erst_dequeue: Event ring dequeue pointer.
+ *
+ * Each interrupter (defined by a MSI-X vector) has an event ring and an Event
+ * Ring Segment Table (ERST) associated with it. The event ring is comprised of
+ * multiple segments of the same size. The controller places events on the ring
+ * and "updates the Cycle bit in the TRBs to indicate to software the current
+ * position of the Enqueue Pointer." The driver processes those events and
+ * updates the dequeue pointer.
+ */
+struct cdnsp_intr_reg {
+	__le32 irq_pending;
+	__le32 irq_control;
+	__le32 erst_size;
+	__le32 rsvd;
+	__le64 erst_base;
+	__le64 erst_dequeue;
+};
+
+/* IMAN - Interrupt Management Register - irq_pending bitmasks l. */
+#define IMAN_IE			BIT(1)
+#define IMAN_IP			BIT(0)
+/* bits 2:31 need to be preserved */
+#define IMAN_IE_SET(p)		((p) | IMAN_IE)
+#define IMAN_IE_CLEAR(p)	((p) & ~IMAN_IE)
+
+/* IMOD - Interrupter Moderation Register - irq_control bitmasks. */
+/*
+ * Minimum interval between interrupts (in 250ns intervals). The interval
+ * between interrupts will be longer if there are no events on the event ring.
+ * Default is 4000 (1 ms).
+ */
+#define IMOD_INTERVAL_MASK	GENMASK(15, 0)
+/* Counter used to count down the time to the next interrupt - HW use only */
+#define IMOD_COUNTER_MASK	GENMASK(31, 16)
+#define IMOD_DEFAULT_INTERVAL	0
+
+/* erst_size bitmasks. */
+/* Preserve bits 16:31 of erst_size. */
+#define ERST_SIZE_MASK		GENMASK(31, 16)
+
+/* erst_dequeue bitmasks. */
+/*
+ * Dequeue ERST Segment Index (DESI) - Segment number (or alias)
+ * where the current dequeue pointer lies. This is an optional HW hint.
+ */
+#define ERST_DESI_MASK		GENMASK(2, 0)
+/* Event Handler Busy (EHB) - is the event ring scheduled to be serviced. */
+#define ERST_EHB		BIT(3)
+#define ERST_PTR_MASK		GENMASK(3, 0)
+
+/**
+ * struct cdnsp_run_regs
+ * @microframe_index: MFINDEX - current microframe number.
+ * @ir_set: Array of Interrupter registers.
+ *
+ * Device Controller Runtime Registers:
+ * "Software should read and write these registers using only Dword (32 bit)
+ * or larger accesses"
+ */
+struct cdnsp_run_regs {
+	__le32 microframe_index;
+	__le32 rsvd[7];
+	struct cdnsp_intr_reg ir_set[128];
+};
+
+/**
+ * USB2.0 Port Peripheral Configuration Registers.
+ * @ext_cap: Header register for Extended Capability.
+ * @port_reg1: Timer Configuration Register.
+ * @port_reg2: Timer Configuration Register.
+ * @port_reg3: Timer Configuration Register.
+ * @port_reg4: Timer Configuration Register.
+ * @port_reg5: Timer Configuration Register.
+ * @port_reg6: Chicken bits for USB20PPP.
+ */
+struct cdnsp_20port_cap {
+	__le32 ext_cap;
+	__le32 port_reg1;
+	__le32 port_reg2;
+	__le32 port_reg3;
+	__le32 port_reg4;
+	__le32 port_reg5;
+	__le32 port_reg6;
+};
+
+/* Extended capability register fields */
+#define EXT_CAPS_ID(p)			(((p) >> 0) & GENMASK(7, 0))
+#define EXT_CAPS_NEXT(p)		(((p) >> 8) & GENMASK(7, 0))
+/* Extended capability IDs - ID 0 reserved */
+#define EXT_CAPS_PROTOCOL		2
+
+/* USB 2.0 Port Peripheral Configuration Extended Capability */
+#define EXT_CAP_CFG_DEV_20PORT_CAP_ID	0xC1
+/*
+ * Setting this bit to '1' enables automatic wakeup from L1 state on transfer
+ * TRB prepared when USBSSP operates in USB2.0 mode.
+ */
+#define PORT_REG6_L1_L0_HW_EN		BIT(1)
+/*
+ * Setting this bit to '1' forces Full Speed when USBSSP operates in USB2.0
+ * mode (disables High Speed).
+ */
+#define PORT_REG6_FORCE_FS		BIT(0)
+
+/**
+ * USB3.x Port Peripheral Configuration Registers.
+ * @ext_cap: Header register for Extended Capability.
+ * @mode_addr: Miscellaneous 3xPORT operation mode configuration register.
+ * @mode_2: 3x Port Control Register 2.
+ */
+struct cdnsp_3xport_cap {
+	__le32 ext_cap;
+	__le32 mode_addr;
+	__le32 reserved[52];
+	__le32 mode_2;
+};
+
+/* Extended Capability Header for 3XPort Configuration Registers. */
+#define D_XEC_CFG_3XPORT_CAP		0xC0
+#define CFG_3XPORT_SSP_SUPPORT		BIT(31)
+#define CFG_3XPORT_U1_PIPE_CLK_GATE_EN	BIT(0)
+
+/* Revision Extended Capability ID */
+#define RTL_REV_CAP			0xC4
+#define RTL_REV_CAP_RX_BUFF_CMD_SIZE	BITMASK(31, 24)
+#define RTL_REV_CAP_RX_BUFF_SIZE	BITMASK(15, 0)
+#define RTL_REV_CAP_TX_BUFF_CMD_SIZE	BITMASK(31, 24)
+#define RTL_REV_CAP_TX_BUFF_SIZE	BITMASK(15, 0)
+
+#define CDNSP_VER_1 0x00000000
+#define CDNSP_VER_2 0x10000000
+
+#define CDNSP_IF_EP_EXIST(pdev, ep_num, dir) \
+			 (readl(&(pdev)->rev_cap->ep_supported) & \
+			 (BIT(ep_num) << ((dir) ? 0 : 16)))
+
+/**
+ * struct cdnsp_rev_cap - controller capabilities.
+ * @ext_cap: Header for RTL Revision Extended Capability.
+ * @rtl_revision: RTL revision.
+ * @rx_buff_size: Rx buffer sizes.
+ * @tx_buff_size: Tx buffer sizes.
+ * @ep_supported: Supported endpoints.
+ * @ctrl_revision: Controller revision ID.
+ */
+struct cdnsp_rev_cap {
+	__le32 ext_cap;
+	__le32 rtl_revision;
+	__le32 rx_buff_size;
+	__le32 tx_buff_size;
+	__le32 ep_supported;
+	__le32 ctrl_revision;
+};
+
+/* USB2.0 Port Peripheral Configuration Registers. */
+#define D_XEC_PRE_REGS_CAP		0xC8
+#define REG_CHICKEN_BITS_2_OFFSET	0x48
+#define CHICKEN_XDMA_2_TP_CACHE_DIS	BIT(28)
+
+/* XBUF Extended Capability ID. */
+#define XBUF_CAP_ID			0xCB
+#define XBUF_RX_TAG_MASK_0_OFFSET	0x1C
+#define XBUF_RX_TAG_MASK_1_OFFSET	0x24
+#define XBUF_TX_CMD_OFFSET		0x2C
+
+/**
+ * struct cdnsp_doorbell_array.
+ * @cmd_db: Command ring doorbell register.
+ * @ep_db: Endpoint ring doorbell register.
+ *         Bits 0 - 7: Endpoint target.
+ *         Bits 8 - 15: RsvdZ.
+ *         Bits 16 - 31: Stream ID.
+ */
+struct cdnsp_doorbell_array {
+	__le32 cmd_db;
+	__le32 ep_db;
+};
+
+#define DB_VALUE(ep, stream)		((((ep) + 1) & 0xff) | ((stream) << 16))
+#define DB_VALUE_EP0_OUT(ep, stream)	((ep) & 0xff)
+#define DB_VALUE_CMD			0x00000000
+
+/**
+ * struct cdnsp_container_ctx.
+ * @type: Type of context. Used to calculated offsets to contained contexts.
+ * @size: Size of the context data.
+ * @ctx_size: context data structure size - 64 or 32 bits.
+ * @dma: dma address of the bytes.
+ * @bytes: The raw context data given to HW.
+ *
+ * Represents either a Device or Input context. Holds a pointer to the raw
+ * memory used for the context (bytes) and dma address of it (dma).
+ */
+struct cdnsp_container_ctx {
+	unsigned int type;
+#define CDNSP_CTX_TYPE_DEVICE	0x1
+#define CDNSP_CTX_TYPE_INPUT	0x2
+	int size;
+	int ctx_size;
+	dma_addr_t dma;
+	u8 *bytes;
+};
+
+/**
+ * struct cdnsp_slot_ctx
+ * @dev_info: Device speed, and last valid endpoint.
+ * @dev_port: Device port number that is needed to access the USB device.
+ * @int_target: Interrupter target number.
+ * @dev_state: Slot state and device address.
+ *
+ * Slot Context - This assumes the controller uses 32-byte context
+ * structures. If the controller uses 64-byte contexts, there is an additional
+ * 32 bytes reserved at the end of the slot context for controller internal use.
+ */
+struct cdnsp_slot_ctx {
+	__le32 dev_info;
+	__le32 dev_port;
+	__le32 int_target;
+	__le32 dev_state;
+	/* offset 0x10 to 0x1f reserved for controller internal use. */
+	__le32 reserved[4];
+};
+
+/* Bits 20:23 in the Slot Context are the speed for the device. */
+#define SLOT_SPEED_FS		(XDEV_FS << 10)
+#define SLOT_SPEED_HS		(XDEV_HS << 10)
+#define SLOT_SPEED_SS		(XDEV_SS << 10)
+#define SLOT_SPEED_SSP		(XDEV_SSP << 10)
+
+/* dev_info bitmasks. */
+/* Device speed - values defined by PORTSC Device Speed field - 20:23. */
+#define DEV_SPEED		GENMASK(23, 20)
+#define GET_DEV_SPEED(n)	(((n) & DEV_SPEED) >> 20)
+/* Index of the last valid endpoint context in this device context - 27:31. */
+#define LAST_CTX_MASK		((unsigned int)GENMASK(31, 27))
+#define LAST_CTX(p)		((p) << 27)
+#define LAST_CTX_TO_EP_NUM(p)	(((p) >> 27) - 1)
+#define SLOT_FLAG		BIT(0)
+#define EP0_FLAG		BIT(1)
+
+/* dev_port bitmasks */
+/* Device port number that is needed to access the USB device. */
+#define DEV_PORT(p)		(((p) & 0xff) << 16)
+
+/* dev_state bitmasks */
+/* USB device address - assigned by the controller. */
+#define DEV_ADDR_MASK		GENMASK(7, 0)
+/* Slot state */
+#define SLOT_STATE		GENMASK(31, 27)
+#define GET_SLOT_STATE(p)	(((p) & SLOT_STATE) >> 27)
+
+#define SLOT_STATE_DISABLED	0
+#define SLOT_STATE_ENABLED	SLOT_STATE_DISABLED
+#define SLOT_STATE_DEFAULT	1
+#define SLOT_STATE_ADDRESSED	2
+#define SLOT_STATE_CONFIGURED	3
+
+/**
+ * struct cdnsp_ep_ctx.
+ * @ep_info: Endpoint state, streams, mult, and interval information.
+ * @ep_info2: Information on endpoint type, max packet size, max burst size,
+ *            error count, and whether the controller will force an event for
+ *            all transactions.
+ * @deq: 64-bit ring dequeue pointer address. If the endpoint only
+ *       defines one stream, this points to the endpoint transfer ring.
+ *       Otherwise, it points to a stream context array, which has a
+ *       ring pointer for each flow.
+ * @tx_info: Average TRB lengths for the endpoint ring and
+ *	     max payload within an Endpoint Service Interval Time (ESIT).
+ *
+ * Endpoint Context - This assumes the controller uses 32-byte context
+ * structures. If the controller uses 64-byte contexts, there is an additional
+ * 32 bytes reserved at the end of the endpoint context for controller internal
+ * use.
+ */
+struct cdnsp_ep_ctx {
+	__le32 ep_info;
+	__le32 ep_info2;
+	__le64 deq;
+	__le32 tx_info;
+	/* offset 0x14 - 0x1f reserved for controller internal use. */
+	__le32 reserved[3];
+};
+
+/* ep_info bitmasks. */
+/*
+ * Endpoint State - bits 0:2:
+ * 0 - disabled
+ * 1 - running
+ * 2 - halted due to halt condition
+ * 3 - stopped
+ * 4 - TRB error
+ * 5-7 - reserved
+ */
+#define EP_STATE_MASK		GENMASK(3, 0)
+#define EP_STATE_DISABLED	0
+#define EP_STATE_RUNNING	1
+#define EP_STATE_HALTED		2
+#define EP_STATE_STOPPED	3
+#define EP_STATE_ERROR		4
+#define GET_EP_CTX_STATE(ctx)	(le32_to_cpu((ctx)->ep_info) & EP_STATE_MASK)
+
+/* Mult - Max number of burst within an interval, in EP companion desc. */
+#define EP_MULT(p)			(((p) << 8) & GENMASK(9, 8))
+#define CTX_TO_EP_MULT(p)		(((p) & GENMASK(9, 8)) >> 8)
+/* bits 10:14 are Max Primary Streams. */
+/* bit 15 is Linear Stream Array. */
+/* Interval - period between requests to an endpoint - 125u increments. */
+#define EP_INTERVAL(p)			(((p) << 16) & GENMASK(23, 16))
+#define EP_INTERVAL_TO_UFRAMES(p)	(1 << (((p) & GENMASK(23, 16)) >> 16))
+#define CTX_TO_EP_INTERVAL(p)		(((p) & GENMASK(23, 16)) >> 16)
+#define EP_MAXPSTREAMS_MASK		GENMASK(14, 10)
+#define EP_MAXPSTREAMS(p)		(((p) << 10) & EP_MAXPSTREAMS_MASK)
+#define CTX_TO_EP_MAXPSTREAMS(p)	(((p) & EP_MAXPSTREAMS_MASK) >> 10)
+/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
+#define EP_HAS_LSA			BIT(15)
+
+/* ep_info2 bitmasks */
+#define ERROR_COUNT(p)		(((p) & 0x3) << 1)
+#define CTX_TO_EP_TYPE(p)	(((p) >> 3) & 0x7)
+#define EP_TYPE(p)		((p) << 3)
+#define ISOC_OUT_EP		1
+#define BULK_OUT_EP		2
+#define INT_OUT_EP		3
+#define CTRL_EP			4
+#define ISOC_IN_EP		5
+#define BULK_IN_EP		6
+#define INT_IN_EP		7
+/* bit 6 reserved. */
+/* bit 7 is Device Initiate Disable - for disabling stream selection. */
+#define MAX_BURST(p)		(((p) << 8) & GENMASK(15, 8))
+#define CTX_TO_MAX_BURST(p)	(((p) & GENMASK(15, 8)) >> 8)
+#define MAX_PACKET(p)		(((p) << 16) & GENMASK(31, 16))
+#define MAX_PACKET_MASK		GENMASK(31, 16)
+#define MAX_PACKET_DECODED(p)	(((p) & GENMASK(31, 16)) >> 16)
+
+/* tx_info bitmasks. */
+#define EP_AVG_TRB_LENGTH(p)		((p) & GENMASK(15, 0))
+#define EP_MAX_ESIT_PAYLOAD_LO(p)	(((p) << 16) & GENMASK(31, 16))
+#define EP_MAX_ESIT_PAYLOAD_HI(p)	((((p) & GENMASK(23, 16)) >> 16) << 24)
+#define CTX_TO_MAX_ESIT_PAYLOAD_LO(p)	(((p) & GENMASK(31, 16)) >> 16)
+#define CTX_TO_MAX_ESIT_PAYLOAD_HI(p)	(((p) & GENMASK(31, 24)) >> 24)
+
+/* deq bitmasks. */
+#define EP_CTX_CYCLE_MASK		BIT(0)
+#define CTX_DEQ_MASK			(~0xfL)
+
+/**
+ * struct cdnsp_input_control_context
+ * Input control context;
+ *
+ * @drop_context: Set the bit of the endpoint context you want to disable.
+ * @add_context: Set the bit of the endpoint context you want to enable.
+ */
+struct cdnsp_input_control_ctx {
+	__le32 drop_flags;
+	__le32 add_flags;
+	__le32 rsvd2[6];
+};
+
+/**
+ * Represents everything that is needed to issue a command on the command ring.
+ *
+ * @in_ctx: Pointer to input context structure.
+ * @status: Command Completion Code for last command.
+ * @command_trb: Pointer to command TRB.
+ */
+struct cdnsp_command {
+	/* Input context for changing device state. */
+	struct cdnsp_container_ctx *in_ctx;
+	u32 status;
+	union cdnsp_trb *command_trb;
+};
+
+/**
+ * Stream context structure.
+ *
+ * @stream_ring: 64-bit stream ring address, cycle state, and stream type.
+ * @reserved: offset 0x14 - 0x1f reserved for controller internal use.
+ */
+struct cdnsp_stream_ctx {
+	__le64 stream_ring;
+	__le32 reserved[2];
+};
+
+/* Stream Context Types - bits 3:1 of stream ctx deq ptr. */
+#define SCT_FOR_CTX(p)		(((p) << 1) & GENMASK(3, 1))
+/* Secondary stream array type, dequeue pointer is to a transfer ring. */
+#define SCT_SEC_TR		0
+/* Primary stream array type, dequeue pointer is to a transfer ring. */
+#define SCT_PRI_TR		1
+
+/**
+ *  struct cdnsp_stream_info: Representing everything that is needed to
+ *                            supports stream capable endpoints.
+ *  @stream_rings: Array of pointers containing Transfer rings for all
+ *                 supported streams.
+ *  @num_streams: Number of streams, including stream 0.
+ *  @stream_ctx_array: The stream context array may be bigger than the number
+ *                     of streams the driver asked for.
+ *  @num_stream_ctxs: Number of streams.
+ *  @ctx_array_dma: Dma address of Context Stream Array.
+ *  @trb_address_map: For mapping physical TRB addresses to segments in
+ *                    stream rings.
+ *  @td_count: Number of TDs associated with endpoint.
+ *  @first_prime_det: First PRIME packet detected.
+ *  @drbls_count: Number of allowed doorbells.
+ */
+struct cdnsp_stream_info {
+	struct cdnsp_ring **stream_rings;
+	unsigned int num_streams;
+	struct cdnsp_stream_ctx *stream_ctx_array;
+	unsigned int num_stream_ctxs;
+	dma_addr_t ctx_array_dma;
+	struct radix_tree_root trb_address_map;
+	int td_count;
+	u8 first_prime_det;
+#define STREAM_DRBL_FIFO_DEPTH 2
+	u8 drbls_count;
+};
+
+#define STREAM_LOG_STREAMS 4
+#define STREAM_NUM_STREAMS BIT(STREAM_LOG_STREAMS)
+
+#if STREAM_LOG_STREAMS > 16 && STREAM_LOG_STREAMS < 1
+#error "Not suupported stream value"
+#endif
+
+/**
+ * struct cdnsp_ep - extended device side representation of USB endpoint.
+ * @endpoint: usb endpoint
+ * @pending_req_list: List of requests queuing on transfer ring.
+ * @pdev: Device associated with this endpoint.
+ * @number: Endpoint number (1 - 15).
+ * idx: The device context index (DCI).
+ * interval: Interval between packets used for ISOC endpoint.
+ * @name: A human readable name e.g. ep1out.
+ * @direction: Endpoint direction.
+ * @buffering: Number of on-chip buffers related to endpoint.
+ * @buffering_period; Number of on-chip buffers related to periodic endpoint.
+ * @in_ctx: Pointer to input endpoint context structure.
+ * @out_ctx: Pointer to output endpoint context structure.
+ * @ring: Pointer to transfer ring.
+ * @stream_info: Hold stream information.
+ * @ep_state: Current state of endpoint.
+ * @skip: Sometimes the controller can not process isochronous endpoint ring
+ *        quickly enough, and it will miss some isoc tds on the ring and
+ *        generate Missed Service Error Event.
+ *        Set skip flag when receive a Missed Service Error Event and
+ *        process the missed tds on the endpoint ring.
+ */
+struct cdnsp_ep {
+	struct usb_ep endpoint;
+	struct list_head pending_list;
+	struct cdnsp_device *pdev;
+	u8 number;
+	u8 idx;
+	u32 interval;
+	char name[20];
+	u8 direction;
+	u8 buffering;
+	u8 buffering_period;
+	struct cdnsp_ep_ctx *in_ctx;
+	struct cdnsp_ep_ctx *out_ctx;
+	struct cdnsp_ring *ring;
+	struct cdnsp_stream_info stream_info;
+	unsigned int ep_state;
+#define EP_ENABLED		BIT(0)
+#define EP_DIS_IN_RROGRESS	BIT(1)
+#define EP_HALTED		BIT(2)
+#define EP_STOPPED		BIT(3)
+#define EP_WEDGE		BIT(4)
+#define EP0_HALTED_STATUS	BIT(5)
+#define EP_HAS_STREAMS		BIT(6)
+#define EP_UNCONFIGURED		BIT(7)
+
+	bool skip;
+};
+
+/**
+ * struct cdnsp_device_context_array
+ * @dev_context_ptr: Array of 64-bit DMA addresses for device contexts.
+ * @dma: DMA address for device contexts structure.
+ */
+struct cdnsp_device_context_array {
+	__le64 dev_context_ptrs[CDNSP_DEV_MAX_SLOTS + 1];
+	dma_addr_t dma;
+};
+
+/**
+ * struct cdnsp_transfer_event.
+ * @buffer: 64-bit buffer address, or immediate data.
+ * @transfer_len: Data length transferred.
+ * @flags: Field is interpreted differently based on the type of TRB.
+ */
+struct cdnsp_transfer_event {
+	__le64 buffer;
+	__le32 transfer_len;
+	__le32 flags;
+};
+
+/* Invalidate event after disabling endpoint. */
+#define TRB_EVENT_INVALIDATE 8
+
+/* Transfer event TRB length bit mask. */
+/* bits 0:23 */
+#define EVENT_TRB_LEN(p)			((p) & GENMASK(23, 0))
+/* Completion Code - only applicable for some types of TRBs */
+#define COMP_CODE_MASK				(0xff << 24)
+#define GET_COMP_CODE(p)			(((p) & COMP_CODE_MASK) >> 24)
+#define COMP_INVALID				0
+#define COMP_SUCCESS				1
+#define COMP_DATA_BUFFER_ERROR			2
+#define COMP_BABBLE_DETECTED_ERROR		3
+#define COMP_TRB_ERROR				5
+#define COMP_RESOURCE_ERROR			7
+#define COMP_NO_SLOTS_AVAILABLE_ERROR		9
+#define COMP_INVALID_STREAM_TYPE_ERROR		10
+#define COMP_SLOT_NOT_ENABLED_ERROR		11
+#define COMP_ENDPOINT_NOT_ENABLED_ERROR		12
+#define COMP_SHORT_PACKET			13
+#define COMP_RING_UNDERRUN			14
+#define COMP_RING_OVERRUN			15
+#define COMP_VF_EVENT_RING_FULL_ERROR		16
+#define COMP_PARAMETER_ERROR			17
+#define COMP_CONTEXT_STATE_ERROR		19
+#define COMP_EVENT_RING_FULL_ERROR		21
+#define COMP_INCOMPATIBLE_DEVICE_ERROR		22
+#define COMP_MISSED_SERVICE_ERROR		23
+#define COMP_COMMAND_RING_STOPPED		24
+#define COMP_COMMAND_ABORTED			25
+#define COMP_STOPPED				26
+#define COMP_STOPPED_LENGTH_INVALID		27
+#define COMP_STOPPED_SHORT_PACKET		28
+#define COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR	29
+#define COMP_ISOCH_BUFFER_OVERRUN		31
+#define COMP_EVENT_LOST_ERROR			32
+#define COMP_UNDEFINED_ERROR			33
+#define COMP_INVALID_STREAM_ID_ERROR		34
+
+/*Transfer Event NRDY bit fields */
+#define TRB_TO_DEV_STREAM(p)			((p) & GENMASK(16, 0))
+#define TRB_TO_HOST_STREAM(p)			((p) & GENMASK(16, 0))
+#define STREAM_PRIME_ACK			0xFFFE
+#define STREAM_REJECTED				0xFFFF
+
+/** Transfer Event bit fields **/
+#define TRB_TO_EP_ID(p)				(((p) & GENMASK(20, 16)) >> 16)
+
+/**
+ * struct cdnsp_link_trb
+ * @segment_ptr: 64-bit segment pointer.
+ * @intr_target: Interrupter target.
+ * @control: Flags.
+ */
+struct cdnsp_link_trb {
+	__le64 segment_ptr;
+	__le32 intr_target;
+	__le32 control;
+};
+
+/* control bitfields */
+#define LINK_TOGGLE	BIT(1)
+
+/**
+ * struct cdnsp_event_cmd - Command completion event TRB.
+ * cmd_trb: Pointer to command TRB, or the value passed by the event data trb
+ * status: Command completion parameters and error code.
+ * flags: Flags.
+ */
+struct cdnsp_event_cmd {
+	__le64 cmd_trb;
+	__le32 status;
+	__le32 flags;
+};
+
+/* flags bitmasks */
+
+/* Address device - disable SetAddress. */
+#define TRB_BSR		BIT(9)
+
+/* Configure Endpoint - Deconfigure. */
+#define TRB_DC		BIT(9)
+
+/* Force Header */
+#define TRB_FH_TO_PACKET_TYPE(p)	((p) & GENMASK(4, 0))
+#define TRB_FH_TR_PACKET		0x4
+#define TRB_FH_TO_DEVICE_ADDRESS(p)	(((p) << 25) & GENMASK(31, 25))
+#define TRB_FH_TR_PACKET_DEV_NOT	0x6
+#define TRB_FH_TO_NOT_TYPE(p)		(((p) << 4) & GENMASK(7, 4))
+#define TRB_FH_TR_PACKET_FUNCTION_WAKE	0x1
+#define TRB_FH_TO_INTERFACE(p)		(((p) << 8) & GENMASK(15, 8))
+
+enum cdnsp_setup_dev {
+	SETUP_CONTEXT_ONLY,
+	SETUP_CONTEXT_ADDRESS,
+};
+
+/* bits 24:31 are the slot ID. */
+#define TRB_TO_SLOT_ID(p)		(((p) & GENMASK(31, 24)) >> 24)
+#define SLOT_ID_FOR_TRB(p)		(((p) << 24) & GENMASK(31, 24))
+
+/* Stop Endpoint TRB - ep_index to endpoint ID for this TRB. */
+#define TRB_TO_EP_INDEX(p)		(((p) >> 16) & 0x1f)
+
+#define EP_ID_FOR_TRB(p)		((((p) + 1) << 16) & GENMASK(20, 16))
+
+#define SUSPEND_PORT_FOR_TRB(p)		(((p) & 1) << 23)
+#define TRB_TO_SUSPEND_PORT(p)		(((p) >> 23) & 0x1)
+#define LAST_EP_INDEX			30
+
+/* Set TR Dequeue Pointer command TRB fields. */
+#define TRB_TO_STREAM_ID(p)		((((p) & GENMASK(31, 16)) >> 16))
+#define STREAM_ID_FOR_TRB(p)		((((p)) << 16) & GENMASK(31, 16))
+#define SCT_FOR_TRB(p)			(((p) << 1) & 0x7)
+
+/* Link TRB specific fields. */
+#define TRB_TC				BIT(1)
+
+/* Port Status Change Event TRB fields. */
+/* Port ID - bits 31:24. */
+#define GET_PORT_ID(p)			(((p) & GENMASK(31, 24)) >> 24)
+#define SET_PORT_ID(p)			(((p) << 24) & GENMASK(31, 24))
+#define EVENT_DATA			BIT(2)
+
+/* Normal TRB fields. */
+/* transfer_len bitmasks - bits 0:16. */
+#define TRB_LEN(p)			((p) & GENMASK(16, 0))
+/* TD Size, packets remaining in this TD, bits 21:17 (5 bits, so max 31). */
+#define TRB_TD_SIZE(p)			(min((p), (u32)31) << 17)
+#define GET_TD_SIZE(p)			(((p) & GENMASK(21, 17)) >> 17)
+/*
+ * Controller uses the TD_SIZE field for TBC if Extended TBC
+ * is enabled (ETE).
+ */
+#define TRB_TD_SIZE_TBC(p)		(min((p), (u32)31) << 17)
+/* Interrupter Target - which MSI-X vector to target the completion event at. */
+#define TRB_INTR_TARGET(p)		(((p) << 22) & GENMASK(31, 22))
+#define GET_INTR_TARGET(p)		(((p) & GENMASK(31, 22)) >> 22)
+/*
+ * Total burst count field, Rsvdz on controller with Extended TBC
+ * enabled (ETE).
+ */
+#define TRB_TBC(p)			(((p) & 0x3) << 7)
+#define TRB_TLBPC(p)			(((p) & 0xf) << 16)
+
+/* Cycle bit - indicates TRB ownership by driver or driver.*/
+#define TRB_CYCLE			BIT(0)
+/*
+ * Force next event data TRB to be evaluated before task switch.
+ * Used to pass OS data back after a TD completes.
+ */
+#define TRB_ENT				BIT(1)
+/* Interrupt on short packet. */
+#define TRB_ISP				BIT(2)
+/* Set PCIe no snoop attribute. */
+#define TRB_NO_SNOOP			BIT(3)
+/* Chain multiple TRBs into a TD. */
+#define TRB_CHAIN			BIT(4)
+/* Interrupt on completion. */
+#define TRB_IOC				BIT(5)
+/* The buffer pointer contains immediate data. */
+#define TRB_IDT				BIT(6)
+/* 0 - NRDY during data stage, 1 - NRDY during status stage (only control). */
+#define TRB_STAT			BIT(7)
+/* Block Event Interrupt. */
+#define TRB_BEI				BIT(9)
+
+/* Control transfer TRB specific fields. */
+#define TRB_DIR_IN			BIT(16)
+
+/* TRB bit mask in Data Stage TRB */
+#define TRB_SETUPID_BITMASK		GENMASK(9, 8)
+#define TRB_SETUPID(p)			((p) << 8)
+#define TRB_SETUPID_TO_TYPE(p)		(((p) & TRB_SETUPID_BITMASK) >> 8)
+
+#define TRB_SETUP_SPEEDID_USB3		0x1
+#define TRB_SETUP_SPEEDID_USB2		0x0
+#define TRB_SETUP_SPEEDID(p)		((p) & (1 << 7))
+
+#define TRB_SETUPSTAT_ACK		0x1
+#define TRB_SETUPSTAT_STALL		0x0
+#define TRB_SETUPSTAT(p)		((p) << 6)
+
+/* Isochronous TRB specific fields */
+#define TRB_SIA				BIT(31)
+#define TRB_FRAME_ID(p)			(((p) << 20) & GENMASK(30, 20))
+
+struct cdnsp_generic_trb {
+	__le32 field[4];
+};
+
+union cdnsp_trb {
+	struct cdnsp_link_trb link;
+	struct cdnsp_transfer_event trans_event;
+	struct cdnsp_event_cmd event_cmd;
+	struct cdnsp_generic_trb generic;
+};
+
+/* TRB bit mask. */
+#define TRB_TYPE_BITMASK	GENMASK(15, 10)
+#define TRB_TYPE(p)		((p) << 10)
+#define TRB_FIELD_TO_TYPE(p)	(((p) & TRB_TYPE_BITMASK) >> 10)
+
+/* TRB type IDs. */
+/* bulk, interrupt, isoc scatter/gather, and control data stage. */
+#define TRB_NORMAL		1
+/* Setup Stage for control transfers. */
+#define TRB_SETUP		2
+/* Data Stage for control transfers. */
+#define TRB_DATA		3
+/* Status Stage for control transfers. */
+#define TRB_STATUS		4
+/* ISOC transfers. */
+#define TRB_ISOC		5
+/* TRB for linking ring segments. */
+#define TRB_LINK		6
+#define TRB_EVENT_DATA		7
+/* Transfer Ring No-op (not for the command ring). */
+#define TRB_TR_NOOP		8
+
+/* Command TRBs */
+/* Enable Slot Command. */
+#define TRB_ENABLE_SLOT		9
+/* Disable Slot Command. */
+#define TRB_DISABLE_SLOT	10
+/* Address Device Command. */
+#define TRB_ADDR_DEV		11
+/* Configure Endpoint Command. */
+#define TRB_CONFIG_EP		12
+/* Evaluate Context Command. */
+#define TRB_EVAL_CONTEXT	13
+/* Reset Endpoint Command. */
+#define TRB_RESET_EP		14
+/* Stop Transfer Ring Command. */
+#define TRB_STOP_RING		15
+/* Set Transfer Ring Dequeue Pointer Command. */
+#define TRB_SET_DEQ		16
+/* Reset Device Command. */
+#define TRB_RESET_DEV		17
+/* Force Event Command (opt). */
+#define TRB_FORCE_EVENT		18
+/* Force Header Command - generate a transaction or link management packet. */
+#define TRB_FORCE_HEADER	22
+/* No-op Command - not for transfer rings. */
+#define TRB_CMD_NOOP		23
+/* TRB IDs 24-31 reserved. */
+
+/* Event TRBS. */
+/* Transfer Event. */
+#define TRB_TRANSFER		32
+/* Command Completion Event. */
+#define TRB_COMPLETION		33
+/* Port Status Change Event. */
+#define TRB_PORT_STATUS		34
+/* Device Controller Event. */
+#define TRB_HC_EVENT		37
+/* MFINDEX Wrap Event - microframe counter wrapped. */
+#define TRB_MFINDEX_WRAP	39
+/* TRB IDs 40-47 reserved. */
+/* Endpoint Not Ready Event. */
+#define TRB_ENDPOINT_NRDY	48
+/* TRB IDs 49-53 reserved. */
+/* Halt Endpoint Command. */
+#define TRB_HALT_ENDPOINT	54
+/* Doorbell Overflow Event. */
+#define TRB_DRB_OVERFLOW	57
+/* Flush Endpoint Command. */
+#define TRB_FLUSH_ENDPOINT	58
+
+#define TRB_TYPE_LINK(x)	(((x) & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
+#define TRB_TYPE_LINK_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
+					cpu_to_le32(TRB_TYPE(TRB_LINK)))
+#define TRB_TYPE_NOOP_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
+					cpu_to_le32(TRB_TYPE(TRB_TR_NOOP)))
+
+/*
+ * TRBS_PER_SEGMENT must be a multiple of 4.
+ * The command ring is 64-byte aligned, so it must also be greater than 16.
+ */
+#define TRBS_PER_SEGMENT		256
+#define TRBS_PER_EVENT_SEGMENT		256
+#define TRBS_PER_EV_DEQ_UPDATE		100
+#define TRB_SEGMENT_SIZE		(TRBS_PER_SEGMENT * 16)
+#define TRB_SEGMENT_SHIFT		(ilog2(TRB_SEGMENT_SIZE))
+/* TRB buffer pointers can't cross 64KB boundaries. */
+#define TRB_MAX_BUFF_SHIFT		16
+#define TRB_MAX_BUFF_SIZE		BIT(TRB_MAX_BUFF_SHIFT)
+/* How much data is left before the 64KB boundary? */
+#define TRB_BUFF_LEN_UP_TO_BOUNDARY(addr) (TRB_MAX_BUFF_SIZE - \
+					((addr) & (TRB_MAX_BUFF_SIZE - 1)))
+
+/**
+ * struct cdnsp_segment - segment related data.
+ * @trbs: Array of Transfer Request Blocks.
+ * @next: Pointer to the next segment.
+ * @dma: DMA address of current segment.
+ * @bounce_dma: Bounce  buffer DMA address .
+ * @bounce_buf: Bounce buffer virtual address.
+ * bounce_offs: Bounce buffer offset.
+ * bounce_len: Bounce buffer length.
+ */
+struct cdnsp_segment {
+	union cdnsp_trb *trbs;
+	struct cdnsp_segment *next;
+	dma_addr_t dma;
+	/* Max packet sized bounce buffer for td-fragmant alignment */
+	dma_addr_t bounce_dma;
+	void *bounce_buf;
+	unsigned int bounce_offs;
+	unsigned int bounce_len;
+};
+
+/**
+ * struct cdnsp_td - Transfer Descriptor object.
+ * @td_list: Used for binding TD with ep_ring->td_list.
+ * @preq: Request associated with this TD
+ * @start_seg: Segment containing the first_trb in TD.
+ * @first_trb: First TRB for this TD.
+ * @last_trb: Last TRB related with TD.
+ * @bounce_seg: Bounce segment for this TD.
+ * @request_length_set: actual_length of the request has already been set.
+ * @drbl - TD has been added to HW scheduler - only for stream capable
+ *         endpoints.
+ */
+struct cdnsp_td {
+	struct list_head td_list;
+	struct cdnsp_request *preq;
+	struct cdnsp_segment *start_seg;
+	union cdnsp_trb *first_trb;
+	union cdnsp_trb *last_trb;
+	struct cdnsp_segment *bounce_seg;
+	bool request_length_set;
+	bool drbl;
+};
+
+/**
+ * struct cdnsp_dequeue_state - New dequeue pointer for Transfer Ring.
+ * @new_deq_seg: New dequeue segment.
+ * @new_deq_ptr: New dequeue pointer.
+ * @new_cycle_state: New cycle state.
+ * @stream_id: stream id for which new dequeue pointer has been selected.
+ */
+struct cdnsp_dequeue_state {
+	struct cdnsp_segment *new_deq_seg;
+	union cdnsp_trb *new_deq_ptr;
+	int new_cycle_state;
+	unsigned int stream_id;
+};
+
+enum cdnsp_ring_type {
+	TYPE_CTRL = 0,
+	TYPE_ISOC,
+	TYPE_BULK,
+	TYPE_INTR,
+	TYPE_STREAM,
+	TYPE_COMMAND,
+	TYPE_EVENT,
+};
+
+/**
+ * struct cdnsp_ring - information describing transfer, command or event ring.
+ * @first_seg: First segment on transfer ring.
+ * @last_seg: Last segment on transfer ring.
+ * @enqueue: SW enqueue pointer address.
+ * @enq_seg: SW enqueue segment address.
+ * @dequeue: SW dequeue pointer address.
+ * @deq_seg: SW dequeue segment address.
+ * @td_list: transfer descriptor list associated with this ring.
+ * @cycle_state: Current cycle bit. Write the cycle state into the TRB cycle
+ *               field to give ownership of the TRB to the device controller
+ *               (if we are the producer) or to check if we own the TRB
+ *               (if we are the consumer).
+ * @stream_id: Stream id
+ * @stream_active: Stream is active - PRIME packet has been detected.
+ * @stream_rejected: This ring has been rejected by host.
+ * @num_tds: Number of TDs associated with ring.
+ * @num_segs: Number of segments.
+ * @num_trbs_free: Number of free TRBs on the ring.
+ * @bounce_buf_len: Length of bounce buffer.
+ * @type: Ring type - event, transfer, or command ring.
+ * @last_td_was_short - TD is short TD.
+ * @trb_address_map: For mapping physical TRB addresses to segments in
+ *                   stream rings.
+ */
+struct cdnsp_ring {
+	struct cdnsp_segment *first_seg;
+	struct cdnsp_segment *last_seg;
+	union cdnsp_trb	 *enqueue;
+	struct cdnsp_segment *enq_seg;
+	union cdnsp_trb	 *dequeue;
+	struct cdnsp_segment *deq_seg;
+	struct list_head td_list;
+	u32 cycle_state;
+	unsigned int stream_id;
+	unsigned int stream_active;
+	unsigned int stream_rejected;
+	int num_tds;
+	unsigned int num_segs;
+	unsigned int num_trbs_free;
+	unsigned int bounce_buf_len;
+	enum cdnsp_ring_type type;
+	bool last_td_was_short;
+	struct radix_tree_root *trb_address_map;
+};
+
+/**
+ * struct cdnsp_erst_entry - even ring segment table entry object.
+ * @seg_addr: 64-bit event ring segment address.
+ * seg_size: Number of TRBs in segment.;
+ */
+struct cdnsp_erst_entry {
+	__le64 seg_addr;
+	__le32 seg_size;
+	/* Set to zero */
+	__le32 rsvd;
+};
+
+/**
+ * struct cdnsp_erst - even ring segment table for event ring.
+ * @entries: Array of event ring segments
+ * @num_entries: Number of segments in entries array.
+ * @erst_dma_addr: DMA address for entries array.
+ */
+struct cdnsp_erst {
+	struct cdnsp_erst_entry *entries;
+	unsigned int num_entries;
+	dma_addr_t erst_dma_addr;
+};
+
+/**
+ * struct cdnsp_request - extended device side representation of usb_request
+ *                        object .
+ * @td: Transfer descriptor associated with this request.
+ * @request: Generic usb_request object describing single I/O request.
+ * @list: Used to adding request to endpoint pending_list.
+ * @pep: Extended representation of usb_ep object
+ * @epnum: Endpoint number associated with usb request.
+ * @direction: Endpoint direction for usb request.
+ */
+struct cdnsp_request {
+	struct	cdnsp_td td;
+	struct usb_request request;
+	struct list_head list;
+	struct cdnsp_ep	 *pep;
+	u8 epnum;
+	unsigned direction:1;
+};
+
+#define	ERST_NUM_SEGS	1
+
+/* Stages used during enumeration process.*/
+enum cdnsp_ep0_stage {
+	CDNSP_SETUP_STAGE,
+	CDNSP_DATA_STAGE,
+	CDNSP_STATUS_STAGE,
+};
+
+/**
+ * struct cdnsp_port - holds information about detected ports.
+ * @port_num: Port number.
+ * @exist: Indicate if port exist.
+ * maj_rev: Major revision.
+ * min_rev: Minor revision.
+ */
+struct cdnsp_port {
+	struct cdnsp_port_regs __iomem *regs;
+	u8 port_num;
+	u8 exist;
+	u8 maj_rev;
+	u8 min_rev;
+};
+
+#define CDNSP_EXT_PORT_MAJOR(x)		(((x) >> 24) & 0xff)
+#define CDNSP_EXT_PORT_MINOR(x)		(((x) >> 16) & 0xff)
+#define CDNSP_EXT_PORT_OFF(x)		((x) & 0xff)
+#define CDNSP_EXT_PORT_COUNT(x)		(((x) >> 8) & 0xff)
+
+/**
+ * struct cdnsp_device - represent USB device.
+ * @dev: Pointer to device structure associated whit this controller.
+ * @gadget: Device side representation of the peripheral controller.
+ * @gadget_driver: Pointer to the gadget driver.
+ * @irq: IRQ line number used by device side.
+ * @regs:IO device memory.
+ * @cap_regs: Capability registers.
+ * @op_regs: Operational registers.
+ * @run_regs: Runtime registers.
+ * @dba: Device base address register.
+ * @ir_set: Current interrupter register set.
+ * @port20_regs: Port 2.0 Peripheral Configuration Registers.
+ * @port3x_regs: USB3.x Port Peripheral Configuration Registers.
+ * @rev_cap: Controller Capabilities Registers.
+ * @hcs_params1: Cached register copies of read-only HCSPARAMS1
+ * @hcc_params: Cached register copies of read-only HCCPARAMS1
+ * @setup: Temporary buffer for setup packet.
+ * @ep0_preq: Internal allocated request used during enumeration.
+ * @ep0_stage: ep0 stage during enumeration process.
+ * @three_stage_setup: Three state or two state setup.
+ * @ep0_expect_in: Data IN expected for control transfer.
+ * @setup_id: Setup identifier.
+ * @setup_speed - Speed detected for current SETUP packet.
+ * @setup_buf: Buffer for SETUP packet.
+ * @device_address: Current device address.
+ * @may_wakeup: remote wakeup enabled/disabled.
+ * @lock: Lock used in interrupt thread context.
+ * @hci_version: device controller version.
+ * @dcbaa: Device context base address array.
+ * @cmd_ring: Command ring.
+ * @cmd: Represent all what is needed to issue command on Command Ring.
+ * @event_ring: Event ring.
+ * @erst: Event Ring Segment table
+ * @slot_id: Current Slot ID. Should be 0 or 1.
+ * @out_ctx: Output context.
+ * @in_ctx: Input context.
+ * @eps: array of endpoints object associated with device.
+ * @usb2_hw_lpm_capable: hardware lpm is enabled;
+ * @u1_allowed: Allow device transition to U1 state.
+ * @u2_allowed: Allow device transition to U2 state
+ * @device_pool: DMA pool for allocating input and output context.
+ * @segment_pool: DMA pool for allocating new segments.
+ * @cdnsp_state: Current state of controller.
+ * @link_state: Current link state.
+ * @usb2_port - Port USB 2.0.
+ * @usb3_port - Port USB 3.0.
+ * @active_port - Current selected Port.
+ * @test_mode: selected Test Mode.
+ */
+struct cdnsp_device {
+	struct device *dev;
+	struct usb_gadget gadget;
+	struct usb_gadget_driver *gadget_driver;
+	unsigned int irq;
+	void __iomem *regs;
+
+	/* Registers map */
+	struct cdnsp_cap_regs __iomem *cap_regs;
+	struct cdnsp_op_regs __iomem *op_regs;
+	struct cdnsp_run_regs __iomem *run_regs;
+	struct cdnsp_doorbell_array __iomem *dba;
+	struct	cdnsp_intr_reg __iomem *ir_set;
+	struct cdnsp_20port_cap __iomem *port20_regs;
+	struct cdnsp_3xport_cap __iomem *port3x_regs;
+	struct cdnsp_rev_cap __iomem *rev_cap;
+
+	/* Cached register copies of read-only CDNSP data */
+	__u32 hcs_params1;
+	__u32 hcs_params3;
+	__u32 hcc_params;
+	/* Lock used in interrupt thread context. */
+	spinlock_t lock;
+	struct usb_ctrlrequest setup;
+	struct cdnsp_request ep0_preq;
+	enum cdnsp_ep0_stage ep0_stage;
+	u8 three_stage_setup;
+	u8 ep0_expect_in;
+	u8 setup_id;
+	u8 setup_speed;
+	void *setup_buf;
+	u8 device_address;
+	int may_wakeup;
+	u16 hci_version;
+
+	/* data structures */
+	struct cdnsp_device_context_array *dcbaa;
+	struct cdnsp_ring *cmd_ring;
+	struct cdnsp_command cmd;
+	struct cdnsp_ring *event_ring;
+	struct cdnsp_erst erst;
+	int slot_id;
+
+	/*
+	 * Commands to the hardware are passed an "input context" that
+	 * tells the hardware what to change in its data structures.
+	 * The hardware will return changes in an "output context" that
+	 * software must allocate for the hardware. .
+	 */
+	struct cdnsp_container_ctx out_ctx;
+	struct cdnsp_container_ctx in_ctx;
+	struct cdnsp_ep eps[CDNSP_ENDPOINTS_NUM];
+	u8 usb2_hw_lpm_capable:1;
+	u8 u1_allowed:1;
+	u8 u2_allowed:1;
+
+	/* DMA pools */
+	struct dma_pool *device_pool;
+	struct dma_pool	*segment_pool;
+
+#define CDNSP_STATE_HALTED		BIT(1)
+#define CDNSP_STATE_DYING		BIT(2)
+#define CDNSP_STATE_DISCONNECT_PENDING	BIT(3)
+#define CDNSP_WAKEUP_PENDING		BIT(4)
+	unsigned int cdnsp_state;
+	unsigned int link_state;
+
+	struct cdnsp_port usb2_port;
+	struct cdnsp_port usb3_port;
+	struct cdnsp_port *active_port;
+	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);
+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(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 0000000000..97866bfb2d
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-mem.c
@@ -0,0 +1,1337 @@
+// 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"
+#include "cdnsp-trace.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;
+
+	trace_cdnsp_ring_free(ring);
+
+	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);
+	trace_cdnsp_ring_alloc(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);
+	trace_cdnsp_ring_expansion(ring);
+
+	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);
+
+		trace_cdnsp_set_stream_ring(cur_ring);
+
+		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)
+{
+	int ret;
+
+	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, GFP_ATOMIC);
+	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;
+
+	trace_cdnsp_alloc_priv_device(pdev);
+	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 = cpu_to_le32((pdev->device_address &
+					   DEV_ADDR_MASK));
+	ep0_ctx->tx_info = cpu_to_le32(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);
+
+	trace_cdnsp_setup_addressable_priv_device(pdev);
+
+	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_mult(pep->endpoint.desc) - 1;
+
+	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 le16_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);
+	if (!pep->ring)
+		return -ENOMEM;
+
+	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)
+{
+	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, GFP_KERNEL);
+	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;
+
+	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, port_count;
+
+	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_count = CDNSP_EXT_PORT_COUNT(temp);
+
+	trace_cdnsp_port_info(addr, port_offset, port_count, port->maj_rev);
+
+	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)
+{
+	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;
+	}
+
+	trace_cdnsp_init("Found USB 2.0 ports and  USB 3.0 ports.");
+
+	pdev->usb2_port.regs = (struct cdnsp_port_regs __iomem *)
+			       (&pdev->op_regs->port_reg_base + NUM_PORT_REGS *
+				(pdev->usb2_port.port_num - 1));
+
+	pdev->usb3_port.regs = (struct cdnsp_port_regs __iomem *)
+			       (&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)
+{
+	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)
+		return -ENOMEM;
+
+	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);
+	if (!pdev->segment_pool)
+		goto release_dcbaa;
+
+	pdev->device_pool = dma_pool_create("CDNSP input/output contexts", dev,
+					    CDNSP_CTX_SIZE, 64, page_size);
+	if (!pdev->device_pool)
+		goto destroy_segment_pool;
+
+
+	/* Set up the command ring to have one segments for now. */
+	pdev->cmd_ring = cdnsp_ring_alloc(pdev, 1, TYPE_COMMAND, 0, GFP_KERNEL);
+	if (!pdev->cmd_ring)
+		goto destroy_device_pool;
+
+	/* 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, GFP_KERNEL);
+	if (!pdev->event_ring)
+		goto free_cmd_ring;
+
+	ret = cdnsp_alloc_erst(pdev, pdev->event_ring, &pdev->erst);
+	if (ret)
+		goto free_event_ring;
+
+	/* 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);
+	if (ret)
+		goto free_erst;
+
+	ret = cdnsp_alloc_priv_device(pdev);
+	if (ret) {
+		dev_err(pdev->dev,
+			"Could not allocate cdnsp_device data structures\n");
+		goto free_erst;
+	}
+
+	return 0;
+
+free_erst:
+	cdnsp_free_erst(pdev, &pdev->erst);
+free_event_ring:
+	cdnsp_ring_free(pdev, pdev->event_ring);
+free_cmd_ring:
+	cdnsp_ring_free(pdev, pdev->cmd_ring);
+destroy_device_pool:
+	dma_pool_destroy(pdev->device_pool);
+destroy_segment_pool:
+	dma_pool_destroy(pdev->segment_pool);
+release_dcbaa:
+	dma_free_coherent(dev, sizeof(*pdev->dcbaa), pdev->dcbaa,
+			  pdev->dcbaa->dma);
+
+	cdnsp_reset(pdev);
+
+	return ret;
+}
diff --git a/drivers/usb/cdns3/cdnsp-pci.c b/drivers/usb/cdns3/cdnsp-pci.c
new file mode 100644
index 0000000000..0725668ffe
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-pci.c
@@ -0,0 +1,248 @@
+// 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		0x0200
+#define CDNS_DRD_ID		0x0100
+#define CDNS_DRD_IF		(PCI_CLASS_SERIAL_USB << 8 | 0x80)
+
+static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)
+{
+	/*
+	 * Gets the second function.
+	 * Platform has two function. The fist keeps resources for
+	 * Host/Device while the secon keeps resources for DRD/OTG.
+	 */
+	if (pdev->device == CDNS_DEVICE_ID)
+		return  pci_get_device(pdev->vendor, CDNS_DRD_ID, NULL);
+	else if (pdev->device == CDNS_DRD_ID)
+		return pci_get_device(pdev->vendor, CDNS_DEVICE_ID, NULL);
+
+	return NULL;
+}
+
+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)) {
+		cdns_remove(cdnsp);
+	} else {
+		kfree(cdnsp);
+	}
+
+	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);
+	spin_unlock_irqrestore(&cdns->lock, flags);
+	cdns_set_active(cdns, 1);
+
+	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 },
+	{ PCI_VENDOR_ID_CDNS, CDNS_DRD_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 0000000000..275a6a2fa6
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -0,0 +1,2494 @@
+// 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-trace.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++;
+			goto out;
+		}
+
+		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;
+		goto out;
+	}
+
+	/* 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;
+	}
+out:
+	trace_cdnsp_inc_deq(ring);
+}
+
+/*
+ * 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;
+	}
+
+	trace_cdnsp_inc_enq(ring);
+}
+
+/*
+ * 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);
+
+	trace_cdnsp_tr_drbl(pep, 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;
+
+	trace_cdnsp_new_deq_state(state);
+}
+
+/*
+ * 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);
+
+		trace_cdnsp_looking_trb_in_td(suspect_dma, start_dma,
+					      end_trb_dma, cur_seg->dma,
+					      end_seg_dma);
+
+		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;
+
+	trace_cdnsp_bounce_unmap(td->preq, seg->bounce_len, seg->bounce_offs,
+				 seg->bounce_dma, 0);
+
+	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);
+
+	trace_cdnsp_handle_cmd_set_deq(cdnsp_get_slot_ctx(&pdev->out_ctx));
+	trace_cdnsp_handle_cmd_set_deq_ep(pep->out_ctx);
+
+	/*
+	 * 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));
+
+	trace_cdnsp_remove_request(pep->out_ctx);
+	trace_cdnsp_remove_request_td(preq);
+
+	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);
+
+	trace_cdnsp_handle_port_status(pdev->active_port->port_num, 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) {
+		trace_cdnsp_wait_for_prime(pep, stream_id);
+		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;
+	}
+
+	*status = 0;
+
+	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) {
+		trace_cdnsp_ep_disabled(pep->out_ctx);
+		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)) {
+			/*
+			 * Don't print warnings if it's due to a stopped
+			 * endpoint generating an extra completion event, or
+			 * a event for the last TRB of a short TD we already
+			 * got a short event for.
+			 * The short TD is already removed from the TD list.
+			 */
+			if (!(trb_comp_code == COMP_STOPPED ||
+			      trb_comp_code == COMP_STOPPED_LENGTH_INVALID ||
+			      ep_ring->last_td_was_short))
+				trace_cdnsp_trb_without_td(ep_ring,
+					(struct cdnsp_generic_trb *)event);
+
+			if (pep->skip) {
+				pep->skip = false;
+				trace_cdnsp_ep_list_empty_with_skip(pep, 0);
+			}
+
+			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);
+
+		desc = td->preq->pep->endpoint.desc;
+
+		if (ep_seg) {
+			ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma)
+					       / sizeof(*ep_trb)];
+
+			trace_cdnsp_handle_transfer(ep_ring,
+					(struct cdnsp_generic_trb *)ep_trb);
+
+			if (pep->skip && usb_endpoint_xfer_isoc(desc) &&
+			    td->last_trb != ep_trb)
+				return -EAGAIN;
+		}
+
+		/*
+		 * 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;
+		}
+
+		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;
+		}
+
+		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;
+	u32 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;
+
+	trace_cdnsp_handle_event(pdev->event_ring, &event->generic);
+
+	/*
+	 * 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;
+	unsigned long flags;
+	int counter = 0;
+
+	local_bh_disable();
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	if (pdev->cdnsp_state & (CDNSP_STATE_HALTED | CDNSP_STATE_DYING)) {
+		/*
+		 * While removing or stopping driver there may still be deferred
+		 * not handled interrupt which should not be treated as error.
+		 * Driver should simply ignore it.
+		 */
+		if (pdev->gadget_driver)
+			cdnsp_died(pdev);
+
+		spin_unlock_irqrestore(&pdev->lock, flags);
+		local_bh_enable();
+		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_irqrestore(&pdev->lock, flags);
+	local_bh_enable();
+
+	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);
+
+	trace_cdnsp_queue_trb(ring, trb);
+	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;
+
+		trace_cdnsp_no_room_on_ring("try ring expansion");
+
+		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 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,
+			      bool zlp)
+{
+	u32 maxp, total_packet_count;
+
+	/* Before ZLP driver needs set TD_SIZE = 1. */
+	if (zlp)
+		return 1;
+
+	/* 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;
+		trace_cdnsp_bounce_align_td_split(preq, *trb_buff_len,
+						  enqd_len, 0, 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;
+
+	trace_cdnsp_bounce_map(preq, new_buff_len, enqd_len, seg->bounce_dma,
+			       unalign);
+
+	/*
+	 * 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 {
+				zero_len_trb = false;
+				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,
+					       zero_len_trb);
+
+		length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) |
+			TRB_INTR_TARGET(0);
+
+		cdnsp_queue_trb(pdev, ring, more_trbs_coming,
+				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, zlp = 0;
+	struct cdnsp_ep *pep = preq->pep;
+	struct cdnsp_ring *ep_ring;
+	int num_trbs;
+	u32 maxp;
+	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;
+
+	maxp = usb_endpoint_maxp(pep->endpoint.desc);
+
+	if (preq->request.zero && preq->request.length &&
+	    (preq->request.length % maxp == 0)) {
+		num_trbs++;
+		zlp = 1;
+	}
+
+	ret = cdnsp_prepare_transfer(pdev, preq, num_trbs);
+	if (ret)
+		return ret;
+
+	/* If there's data, queue data TRBs */
+	if (preq->request.length > 0) {
+		field = TRB_TYPE(TRB_DATA);
+
+		if (zlp)
+			field |= TRB_CHAIN;
+		else
+			field |= TRB_IOC | (pdev->ep0_expect_in ? 0 : TRB_ISP);
+
+		if (pdev->ep0_expect_in)
+			field |= TRB_DIR_IN;
+
+		length_field = TRB_LEN(preq->request.length) |
+			       TRB_TD_SIZE(zlp) | TRB_INTR_TARGET(0);
+
+		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);
+
+		if (zlp) {
+			field = TRB_TYPE(TRB_NORMAL) | TRB_IOC;
+
+			if (!pdev->ep0_expect_in)
+				field = TRB_ISP;
+
+			cdnsp_queue_trb(pdev, ep_ring, true,
+					lower_32_bits(preq->request.dma),
+					upper_32_bits(preq->request.dma), 0,
+					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 ||
+	    ep_state == EP_STATE_HALTED) {
+		trace_cdnsp_ep_stopped_or_disabled(pep->out_ctx);
+		goto ep_stopped;
+	}
+
+	cdnsp_queue_stop_endpoint(pdev, pep->idx);
+	cdnsp_ring_cmd_db(pdev);
+	ret = cdnsp_wait_for_cmd_compl(pdev);
+
+	trace_cdnsp_handle_cmd_stop_ep(pep->out_ctx);
+
+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);
+
+	trace_cdnsp_handle_cmd_flush_ep(pep->out_ctx);
+
+	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 */
+int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
+			struct cdnsp_request *preq)
+{
+	unsigned int trb_buff_len, td_len, td_remain_len, block_len;
+	unsigned int burst_count, last_burst_pkt;
+	unsigned int total_pkt_count, max_pkt;
+	struct cdnsp_generic_trb *start_trb;
+	struct scatterlist *sg = NULL;
+	bool more_trbs_coming = true;
+	struct cdnsp_ring *ep_ring;
+	unsigned int num_sgs = 0;
+	int running_total = 0;
+	u32 field, length_field;
+	u64 addr, send_addr;
+	int start_cycle;
+	int trbs_per_td;
+	int i, sent_len, ret;
+
+	ep_ring = preq->pep->ring;
+
+	td_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);
+		trbs_per_td = count_sg_trbs_needed(preq);
+	} else {
+		addr = (u64)preq->request.dma;
+		block_len = td_len;
+		trbs_per_td = count_trbs_needed(preq);
+	}
+
+	ret = cdnsp_prepare_transfer(pdev, preq, trbs_per_td);
+	if (ret)
+		return ret;
+
+	start_trb = &ep_ring->enqueue->generic;
+	start_cycle = ep_ring->cycle_state;
+	td_remain_len = td_len;
+	send_addr = addr;
+
+	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);
+
+	/*
+	 * 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) |
+		TRB_SIA | TRB_TBC(burst_count);
+
+	if (!start_cycle)
+		field |= TRB_CYCLE;
+
+	/* 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);
+		trb_buff_len = min(trb_buff_len, block_len);
+		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, 0);
+
+		length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) |
+			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(send_addr), upper_32_bits(send_addr),
+				length_field, field);
+
+		running_total += trb_buff_len;
+		addr += trb_buff_len;
+		td_remain_len -= 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;
+	}
+
+	/* 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;
+}
+
+/****		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/cdnsp-trace.c b/drivers/usb/cdns3/cdnsp-trace.c
new file mode 100644
index 0000000000..e50ab799ad
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-trace.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence CDNSP DRD Driver.
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+
+#define CREATE_TRACE_POINTS
+#include "cdnsp-trace.h"
diff --git a/drivers/usb/cdns3/cdnsp-trace.h b/drivers/usb/cdns3/cdnsp-trace.h
new file mode 100644
index 0000000000..4b51011eb0
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-trace.h
@@ -0,0 +1,826 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence CDNSP DRD Driver.
+ * Trace support header file
+ *
+ * Copyright (C) 2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cdnsp-dev
+
+/*
+ * The TRACE_SYSTEM_VAR defaults to TRACE_SYSTEM, but must be a
+ * legitimate C variable. It is not exported to user space.
+ */
+#undef TRACE_SYSTEM_VAR
+#define TRACE_SYSTEM_VAR cdnsp_dev
+
+#if !defined(__CDNSP_DEV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __CDNSP_DEV_TRACE_H
+
+#include <linux/tracepoint.h>
+#include "cdnsp-gadget.h"
+#include "cdnsp-debug.h"
+
+/*
+ * There is limitation for single buffer size in TRACEPOINT subsystem.
+ * By default TRACE_BUF_SIZE is 1024, so no all data will be logged.
+ * To show more data this must be increased. In most cases the default
+ * value is sufficient.
+ */
+#define CDNSP_MSG_MAX 500
+
+DECLARE_EVENT_CLASS(cdnsp_log_ep,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id),
+	TP_STRUCT__entry(
+		__string(name, pep->name)
+		__field(unsigned int, state)
+		__field(u32, stream_id)
+		__field(u8, enabled)
+		__field(unsigned int, num_streams)
+		__field(int, td_count)
+		__field(u8, first_prime_det)
+		__field(u8, drbls_count)
+	),
+	TP_fast_assign(
+		__assign_str(name, pep->name);
+		__entry->state = pep->ep_state;
+		__entry->stream_id = stream_id;
+		__entry->enabled = pep->ep_state & EP_HAS_STREAMS;
+		__entry->num_streams = pep->stream_info.num_streams;
+		__entry->td_count = pep->stream_info.td_count;
+		__entry->first_prime_det = pep->stream_info.first_prime_det;
+		__entry->drbls_count = pep->stream_info.drbls_count;
+	),
+	TP_printk("%s: SID: %08x, ep state: %x, stream: enabled: %d num %d "
+		  "tds %d, first prime: %d drbls %d",
+		  __get_str(name), __entry->stream_id, __entry->state,
+		  __entry->enabled, __entry->num_streams, __entry->td_count,
+		  __entry->first_prime_det, __entry->drbls_count)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_tr_drbl,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_wait_for_prime,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_ep_list_empty_with_skip,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_ep_enable_end,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_ep_disable_end,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DEFINE_EVENT(cdnsp_log_ep, cdnsp_ep_busy_try_halt_again,
+	TP_PROTO(struct cdnsp_ep *pep, u32 stream_id),
+	TP_ARGS(pep, stream_id)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_enable_disable,
+	TP_PROTO(int set),
+	TP_ARGS(set),
+	TP_STRUCT__entry(
+		__field(int, set)
+	),
+	TP_fast_assign(
+		__entry->set = set;
+	),
+	TP_printk("%s", __entry->set ? "enabled" : "disabled")
+);
+
+DEFINE_EVENT(cdnsp_log_enable_disable, cdnsp_pullup,
+	TP_PROTO(int set),
+	TP_ARGS(set)
+);
+
+DEFINE_EVENT(cdnsp_log_enable_disable, cdnsp_u1,
+	TP_PROTO(int set),
+	TP_ARGS(set)
+);
+
+DEFINE_EVENT(cdnsp_log_enable_disable, cdnsp_u2,
+	TP_PROTO(int set),
+	TP_ARGS(set)
+);
+
+DEFINE_EVENT(cdnsp_log_enable_disable, cdnsp_lpm,
+	TP_PROTO(int set),
+	TP_ARGS(set)
+);
+
+DEFINE_EVENT(cdnsp_log_enable_disable, cdnsp_may_wakeup,
+	TP_PROTO(int set),
+	TP_ARGS(set)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_simple,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg),
+	TP_STRUCT__entry(
+		__string(text, msg)
+	),
+	TP_fast_assign(
+		__assign_str(text, msg);
+	),
+	TP_printk("%s", __get_str(text))
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_exit,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_init,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_slot_id,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_no_room_on_ring,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_ep0_status_stage,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_ep0_request,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_ep0_set_config,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_ep0_halted,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+DEFINE_EVENT(cdnsp_log_simple, cdnsp_ep_halt,
+	TP_PROTO(char *msg),
+	TP_ARGS(msg)
+);
+
+TRACE_EVENT(cdnsp_looking_trb_in_td,
+	TP_PROTO(dma_addr_t suspect, dma_addr_t trb_start, dma_addr_t trb_end,
+		 dma_addr_t curr_seg, dma_addr_t end_seg),
+	TP_ARGS(suspect, trb_start, trb_end, curr_seg, end_seg),
+	TP_STRUCT__entry(
+		__field(dma_addr_t, suspect)
+		__field(dma_addr_t, trb_start)
+		__field(dma_addr_t, trb_end)
+		__field(dma_addr_t, curr_seg)
+		__field(dma_addr_t, end_seg)
+	),
+	TP_fast_assign(
+		__entry->suspect = suspect;
+		__entry->trb_start = trb_start;
+		__entry->trb_end = trb_end;
+		__entry->curr_seg = curr_seg;
+		__entry->end_seg = end_seg;
+	),
+	TP_printk("DMA: suspect event: %pad, trb-start: %pad, trb-end %pad, "
+		  "seg-start %pad, seg-end %pad",
+		  &__entry->suspect, &__entry->trb_start, &__entry->trb_end,
+		  &__entry->curr_seg, &__entry->end_seg)
+);
+
+TRACE_EVENT(cdnsp_port_info,
+	TP_PROTO(__le32 __iomem *addr, u32 offset, u32 count, u32 rev),
+	TP_ARGS(addr, offset, count, rev),
+	TP_STRUCT__entry(
+		__field(__le32 __iomem *, addr)
+		__field(u32, offset)
+		__field(u32, count)
+		__field(u32, rev)
+	),
+	TP_fast_assign(
+		__entry->addr = addr;
+		__entry->offset = offset;
+		__entry->count = count;
+		__entry->rev = rev;
+	),
+	TP_printk("Ext Cap %p, port offset = %u, count = %u, rev = 0x%x",
+		  __entry->addr, __entry->offset, __entry->count, __entry->rev)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_deq_state,
+	TP_PROTO(struct cdnsp_dequeue_state *state),
+	TP_ARGS(state),
+	TP_STRUCT__entry(
+		__field(int, new_cycle_state)
+		__field(struct cdnsp_segment *, new_deq_seg)
+		__field(dma_addr_t, deq_seg_dma)
+		__field(union cdnsp_trb	*, new_deq_ptr)
+		__field(dma_addr_t, deq_ptr_dma)
+	),
+	TP_fast_assign(
+		__entry->new_cycle_state = state->new_cycle_state;
+		__entry->new_deq_seg = state->new_deq_seg;
+		__entry->deq_seg_dma = state->new_deq_seg->dma;
+		__entry->new_deq_ptr = state->new_deq_ptr,
+		__entry->deq_ptr_dma = cdnsp_trb_virt_to_dma(state->new_deq_seg,
+							     state->new_deq_ptr);
+	),
+	TP_printk("New cycle state = 0x%x, New dequeue segment = %p (0x%pad dma), "
+		  "New dequeue pointer = %p (0x%pad dma)",
+		  __entry->new_cycle_state, __entry->new_deq_seg,
+		  &__entry->deq_seg_dma, __entry->new_deq_ptr,
+		  &__entry->deq_ptr_dma
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_deq_state, cdnsp_new_deq_state,
+	TP_PROTO(struct cdnsp_dequeue_state *state),
+	TP_ARGS(state)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_ctrl,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl),
+	TP_STRUCT__entry(
+		__field(u8, bRequestType)
+		__field(u8, bRequest)
+		__field(u16, wValue)
+		__field(u16, wIndex)
+		__field(u16, wLength)
+	),
+	TP_fast_assign(
+		__entry->bRequestType = ctrl->bRequestType;
+		__entry->bRequest = ctrl->bRequest;
+		__entry->wValue = le16_to_cpu(ctrl->wValue);
+		__entry->wIndex = le16_to_cpu(ctrl->wIndex);
+		__entry->wLength = le16_to_cpu(ctrl->wLength);
+	),
+	TP_printk("%s", usb_decode_ctrl(__get_buf(CDNSP_MSG_MAX), CDNSP_MSG_MAX,
+					__entry->bRequestType,
+					__entry->bRequest, __entry->wValue,
+					__entry->wIndex, __entry->wLength)
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_ctrl, cdnsp_ctrl_req,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_bounce,
+	TP_PROTO(struct cdnsp_request *preq, u32 new_buf_len, u32 offset,
+		 dma_addr_t dma, unsigned int unalign),
+	TP_ARGS(preq, new_buf_len, offset, dma, unalign),
+	TP_STRUCT__entry(
+		__string(name, preq->pep->name)
+		__field(u32, new_buf_len)
+		__field(u32, offset)
+		__field(dma_addr_t, dma)
+		__field(unsigned int, unalign)
+	),
+	TP_fast_assign(
+		__assign_str(name, preq->pep->name);
+		__entry->new_buf_len = new_buf_len;
+		__entry->offset = offset;
+		__entry->dma = dma;
+		__entry->unalign = unalign;
+	),
+	TP_printk("%s buf len %d, offset %d, dma %pad, unalign %d",
+		  __get_str(name), __entry->new_buf_len,
+		  __entry->offset, &__entry->dma, __entry->unalign
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_bounce, cdnsp_bounce_align_td_split,
+	TP_PROTO(struct cdnsp_request *preq, u32 new_buf_len, u32 offset,
+		 dma_addr_t dma, unsigned int unalign),
+	TP_ARGS(preq, new_buf_len, offset, dma, unalign)
+);
+
+DEFINE_EVENT(cdnsp_log_bounce, cdnsp_bounce_map,
+	TP_PROTO(struct cdnsp_request *preq, u32 new_buf_len, u32 offset,
+		 dma_addr_t dma, unsigned int unalign),
+	TP_ARGS(preq, new_buf_len, offset, dma, unalign)
+);
+
+DEFINE_EVENT(cdnsp_log_bounce, cdnsp_bounce_unmap,
+	TP_PROTO(struct cdnsp_request *preq, u32 new_buf_len, u32 offset,
+		 dma_addr_t dma, unsigned int unalign),
+	TP_ARGS(preq, new_buf_len, offset, dma, unalign)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_trb,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb),
+	TP_STRUCT__entry(
+		__field(u32, type)
+		__field(u32, field0)
+		__field(u32, field1)
+		__field(u32, field2)
+		__field(u32, field3)
+		__field(union cdnsp_trb *, trb)
+		__field(dma_addr_t, trb_dma)
+	),
+	TP_fast_assign(
+		__entry->type = ring->type;
+		__entry->field0 = le32_to_cpu(trb->field[0]);
+		__entry->field1 = le32_to_cpu(trb->field[1]);
+		__entry->field2 = le32_to_cpu(trb->field[2]);
+		__entry->field3 = le32_to_cpu(trb->field[3]);
+		__entry->trb = (union cdnsp_trb *)trb;
+		__entry->trb_dma = cdnsp_trb_virt_to_dma(ring->deq_seg,
+							 (union cdnsp_trb *)trb);
+
+	),
+	TP_printk("%s: %s trb: %p(%pad)", cdnsp_ring_type_string(__entry->type),
+		  cdnsp_decode_trb(__get_buf(CDNSP_MSG_MAX), CDNSP_MSG_MAX,
+				   __entry->field0, __entry->field1,
+				   __entry->field2, __entry->field3),
+				   __entry->trb, &__entry->trb_dma
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_handle_event,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_trb_without_td,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_handle_command,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_handle_transfer,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_queue_trb,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_cmd_wait_for_compl,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_cmd_timeout,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DEFINE_EVENT(cdnsp_log_trb, cdnsp_defered_event,
+	TP_PROTO(struct cdnsp_ring *ring, struct cdnsp_generic_trb *trb),
+	TP_ARGS(ring, trb)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_pdev,
+	TP_PROTO(struct cdnsp_device *pdev),
+	TP_ARGS(pdev),
+	TP_STRUCT__entry(
+		__field(struct cdnsp_device *, pdev)
+		__field(struct usb_gadget *, gadget)
+		__field(dma_addr_t, out_ctx)
+		__field(dma_addr_t, in_ctx)
+		__field(u8, port_num)
+	),
+	TP_fast_assign(
+		__entry->pdev = pdev;
+		__entry->gadget = &pdev->gadget;
+		__entry->in_ctx = pdev->in_ctx.dma;
+		__entry->out_ctx = pdev->out_ctx.dma;
+		__entry->port_num = pdev->active_port ?
+				pdev->active_port->port_num : 0xFF;
+	),
+	TP_printk("pdev %p gadget %p ctx %pad | %pad, port %d ",
+		  __entry->pdev, __entry->gadget, &__entry->in_ctx,
+		  &__entry->out_ctx, __entry->port_num
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_pdev, cdnsp_alloc_priv_device,
+	TP_PROTO(struct cdnsp_device *vdev),
+	TP_ARGS(vdev)
+);
+
+DEFINE_EVENT(cdnsp_log_pdev, cdnsp_free_priv_device,
+	TP_PROTO(struct cdnsp_device *vdev),
+	TP_ARGS(vdev)
+);
+
+DEFINE_EVENT(cdnsp_log_pdev, cdnsp_setup_device,
+	TP_PROTO(struct cdnsp_device *vdev),
+	TP_ARGS(vdev)
+);
+
+DEFINE_EVENT(cdnsp_log_pdev, cdnsp_setup_addressable_priv_device,
+	TP_PROTO(struct cdnsp_device *vdev),
+	TP_ARGS(vdev)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_request,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__string(name, req->pep->name)
+		__field(struct usb_request *, request)
+		__field(struct cdnsp_request *, preq)
+		__field(void *, buf)
+		__field(unsigned int, actual)
+		__field(unsigned int, length)
+		__field(int, status)
+		__field(dma_addr_t, dma)
+		__field(unsigned int, stream_id)
+		__field(unsigned int, zero)
+		__field(unsigned int, short_not_ok)
+		__field(unsigned int, no_interrupt)
+		__field(struct scatterlist*, sg)
+		__field(unsigned int, num_sgs)
+		__field(unsigned int, num_mapped_sgs)
+
+	),
+	TP_fast_assign(
+		__assign_str(name, req->pep->name);
+		__entry->request = &req->request;
+		__entry->preq = req;
+		__entry->buf = req->request.buf;
+		__entry->actual = req->request.actual;
+		__entry->length = req->request.length;
+		__entry->status = req->request.status;
+		__entry->dma = req->request.dma;
+		__entry->stream_id = req->request.stream_id;
+		__entry->zero = req->request.zero;
+		__entry->short_not_ok = req->request.short_not_ok;
+		__entry->no_interrupt = req->request.no_interrupt;
+		__entry->sg = req->request.sg;
+		__entry->num_sgs = req->request.num_sgs;
+		__entry->num_mapped_sgs = req->request.num_mapped_sgs;
+	),
+	TP_printk("%s; req U:%p/P:%p, req buf %p, length %u/%u, status %d, "
+		  "buf dma (%pad), SID %u, %s%s%s, sg %p, num_sg %d,"
+		  " num_m_sg %d",
+		  __get_str(name), __entry->request, __entry->preq,
+		  __entry->buf, __entry->actual, __entry->length,
+		  __entry->status, &__entry->dma,
+		  __entry->stream_id, __entry->zero ? "Z" : "z",
+		  __entry->short_not_ok ? "S" : "s",
+		  __entry->no_interrupt ? "I" : "i",
+		  __entry->sg, __entry->num_sgs, __entry->num_mapped_sgs
+		)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_request_enqueue,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_request_enqueue_busy,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_request_enqueue_error,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_request_dequeue,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_request_giveback,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_alloc_request,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(cdnsp_log_request, cdnsp_free_request,
+	TP_PROTO(struct cdnsp_request *req),
+	TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_ep_ctx,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx),
+	TP_STRUCT__entry(
+		__field(u32, info)
+		__field(u32, info2)
+		__field(u64, deq)
+		__field(u32, tx_info)
+	),
+	TP_fast_assign(
+		__entry->info = le32_to_cpu(ctx->ep_info);
+		__entry->info2 = le32_to_cpu(ctx->ep_info2);
+		__entry->deq = le64_to_cpu(ctx->deq);
+		__entry->tx_info = le32_to_cpu(ctx->tx_info);
+	),
+	TP_printk("%s", cdnsp_decode_ep_context(__get_buf(CDNSP_MSG_MAX), CDNSP_MSG_MAX,
+						__entry->info, __entry->info2,
+						__entry->deq, __entry->tx_info)
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_ep_disabled,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_ep_stopped_or_disabled,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_remove_request,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_handle_cmd_stop_ep,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_handle_cmd_flush_ep,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_handle_cmd_set_deq_ep,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_handle_cmd_reset_ep,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_ep_ctx, cdnsp_handle_cmd_config_ep,
+	TP_PROTO(struct cdnsp_ep_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_slot_ctx,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx),
+	TP_STRUCT__entry(
+		__field(u32, info)
+		__field(u32, info2)
+		__field(u32, int_target)
+		__field(u32, state)
+	),
+	TP_fast_assign(
+		__entry->info = le32_to_cpu(ctx->dev_info);
+		__entry->info2 = le32_to_cpu(ctx->dev_port);
+		__entry->int_target = le32_to_cpu(ctx->int_target);
+		__entry->state = le32_to_cpu(ctx->dev_state);
+	),
+	TP_printk("%s", cdnsp_decode_slot_context(__entry->info,
+						  __entry->info2,
+						  __entry->int_target,
+						  __entry->state)
+	)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_slot_already_in_default,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_handle_cmd_enable_slot,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_handle_cmd_disable_slot,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_reset_device,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_setup_device_slot,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_handle_cmd_addr_dev,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_handle_cmd_reset_dev,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_handle_cmd_set_deq,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DEFINE_EVENT(cdnsp_log_slot_ctx, cdnsp_configure_endpoint,
+	TP_PROTO(struct cdnsp_slot_ctx *ctx),
+	TP_ARGS(ctx)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_td_info,
+	TP_PROTO(struct cdnsp_request *preq),
+	TP_ARGS(preq),
+	TP_STRUCT__entry(
+		__string(name, preq->pep->name)
+		__field(struct usb_request *, request)
+		__field(struct cdnsp_request *, preq)
+		__field(union cdnsp_trb *, first_trb)
+		__field(union cdnsp_trb *, last_trb)
+		__field(dma_addr_t, trb_dma)
+	),
+	TP_fast_assign(
+		__assign_str(name, preq->pep->name);
+		__entry->request = &preq->request;
+		__entry->preq = preq;
+		__entry->first_trb = preq->td.first_trb;
+		__entry->last_trb = preq->td.last_trb;
+		__entry->trb_dma = cdnsp_trb_virt_to_dma(preq->td.start_seg,
+							 preq->td.first_trb)
+	),
+	TP_printk("%s req/preq:  %p/%p, first trb %p[vir]/%pad(dma), last trb %p",
+		  __get_str(name), __entry->request, __entry->preq,
+		  __entry->first_trb, &__entry->trb_dma,
+		  __entry->last_trb
+		)
+);
+
+DEFINE_EVENT(cdnsp_log_td_info, cdnsp_remove_request_td,
+	TP_PROTO(struct cdnsp_request *preq),
+	TP_ARGS(preq)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_ring,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring),
+	TP_STRUCT__entry(
+		__field(u32, type)
+		__field(void *, ring)
+		__field(dma_addr_t, enq)
+		__field(dma_addr_t, deq)
+		__field(dma_addr_t, enq_seg)
+		__field(dma_addr_t, deq_seg)
+		__field(unsigned int, num_segs)
+		__field(unsigned int, stream_id)
+		__field(unsigned int, cycle_state)
+		__field(unsigned int, num_trbs_free)
+		__field(unsigned int, bounce_buf_len)
+	),
+	TP_fast_assign(
+		__entry->ring = ring;
+		__entry->type = ring->type;
+		__entry->num_segs = ring->num_segs;
+		__entry->stream_id = ring->stream_id;
+		__entry->enq_seg = ring->enq_seg->dma;
+		__entry->deq_seg = ring->deq_seg->dma;
+		__entry->cycle_state = ring->cycle_state;
+		__entry->num_trbs_free = ring->num_trbs_free;
+		__entry->bounce_buf_len = ring->bounce_buf_len;
+		__entry->enq = cdnsp_trb_virt_to_dma(ring->enq_seg,
+						     ring->enqueue);
+		__entry->deq = cdnsp_trb_virt_to_dma(ring->deq_seg,
+						     ring->dequeue);
+	),
+	TP_printk("%s %p: enq %pad(%pad) deq %pad(%pad) segs %d stream %d"
+		  " free_trbs %d bounce %d cycle %d",
+		  cdnsp_ring_type_string(__entry->type), __entry->ring,
+		  &__entry->enq, &__entry->enq_seg,
+		  &__entry->deq, &__entry->deq_seg,
+		  __entry->num_segs,
+		  __entry->stream_id,
+		  __entry->num_trbs_free,
+		  __entry->bounce_buf_len,
+		  __entry->cycle_state
+		)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_ring_alloc,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_ring_free,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_set_stream_ring,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_ring_expansion,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_inc_enq,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(cdnsp_log_ring, cdnsp_inc_deq,
+	TP_PROTO(struct cdnsp_ring *ring),
+	TP_ARGS(ring)
+);
+
+DECLARE_EVENT_CLASS(cdnsp_log_portsc,
+		TP_PROTO(u32 portnum, u32 portsc),
+		TP_ARGS(portnum, portsc),
+		TP_STRUCT__entry(
+				__field(u32, portnum)
+				__field(u32, portsc)
+				),
+		TP_fast_assign(
+				__entry->portnum = portnum;
+				__entry->portsc = portsc;
+				),
+		TP_printk("port-%d: %s",
+			  __entry->portnum,
+			  cdnsp_decode_portsc(__get_buf(CDNSP_MSG_MAX), CDNSP_MSG_MAX,
+					      __entry->portsc)
+			)
+);
+
+DEFINE_EVENT(cdnsp_log_portsc, cdnsp_handle_port_status,
+		TP_PROTO(u32 portnum, u32 portsc),
+		TP_ARGS(portnum, portsc)
+);
+
+DEFINE_EVENT(cdnsp_log_portsc, cdnsp_link_state_changed,
+		TP_PROTO(u32 portnum, u32 portsc),
+		TP_ARGS(portnum, portsc)
+);
+
+TRACE_EVENT(cdnsp_stream_number,
+	TP_PROTO(struct cdnsp_ep *pep, int num_stream_ctxs, int num_streams),
+	TP_ARGS(pep, num_stream_ctxs, num_streams),
+	TP_STRUCT__entry(
+		__string(name, pep->name)
+		__field(int, num_stream_ctxs)
+		__field(int, num_streams)
+	),
+	TP_fast_assign(
+		__entry->num_stream_ctxs = num_stream_ctxs;
+		__entry->num_streams = num_streams;
+	),
+	TP_printk("%s Need %u stream ctx entries for %u stream IDs.",
+		  __get_str(name), __entry->num_stream_ctxs,
+		  __entry->num_streams)
+);
+
+#endif /* __CDNSP_TRACE_H */
+
+/* this part must be outside header guard */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE cdnsp-trace
+
+#include <trace/define_trace.h>
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
new file mode 100644
index 0000000000..33548771a0
--- /dev/null
+++ b/drivers/usb/cdns3/core.c
@@ -0,0 +1,582 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS and USBSSP DRD Driver.
+ *
+ * Copyright (C) 2018-2019 Cadence.
+ * Copyright (C) 2017-2018 NXP
+ * Copyright (C) 2019 Texas Instruments
+ *
+ * Author: Peter Chen <peter.chen@nxp.com>
+ *         Pawel Laszczak <pawell@cadence.com>
+ *         Roger Quadros <rogerq@ti.com>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+
+#include "core.h"
+#include "host-export.h"
+#include "drd.h"
+
+static int cdns_idle_init(struct cdns *cdns);
+
+static int cdns_role_start(struct cdns *cdns, enum usb_role role)
+{
+	int ret;
+
+	if (WARN_ON(role > USB_ROLE_DEVICE))
+		return 0;
+
+	mutex_lock(&cdns->mutex);
+	cdns->role = role;
+	mutex_unlock(&cdns->mutex);
+
+	if (!cdns->roles[role])
+		return -ENXIO;
+
+	if (cdns->roles[role]->state == CDNS_ROLE_STATE_ACTIVE)
+		return 0;
+
+	mutex_lock(&cdns->mutex);
+	ret = cdns->roles[role]->start(cdns);
+	if (!ret)
+		cdns->roles[role]->state = CDNS_ROLE_STATE_ACTIVE;
+	mutex_unlock(&cdns->mutex);
+
+	return ret;
+}
+
+static void cdns_role_stop(struct cdns *cdns)
+{
+	enum usb_role role = cdns->role;
+
+	if (WARN_ON(role > USB_ROLE_DEVICE))
+		return;
+
+	if (cdns->roles[role]->state == CDNS_ROLE_STATE_INACTIVE)
+		return;
+
+	mutex_lock(&cdns->mutex);
+	cdns->roles[role]->stop(cdns);
+	cdns->roles[role]->state = CDNS_ROLE_STATE_INACTIVE;
+	mutex_unlock(&cdns->mutex);
+}
+
+static void cdns_exit_roles(struct cdns *cdns)
+{
+	cdns_role_stop(cdns);
+	cdns_drd_exit(cdns);
+}
+
+/**
+ * cdns_core_init_role - initialize role of operation
+ * @cdns: Pointer to cdns structure
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static int cdns_core_init_role(struct cdns *cdns)
+{
+	struct device *dev = cdns->dev;
+	enum usb_dr_mode best_dr_mode;
+	enum usb_dr_mode dr_mode;
+	int ret;
+
+	dr_mode = usb_get_dr_mode(dev);
+	cdns->role = USB_ROLE_NONE;
+
+	/*
+	 * If driver can't read mode by means of usb_get_dr_mode function then
+	 * chooses mode according with Kernel configuration. This setting
+	 * can be restricted later depending on strap pin configuration.
+	 */
+	if (dr_mode == USB_DR_MODE_UNKNOWN) {
+		if (cdns->version == CDNSP_CONTROLLER_V2) {
+			if (IS_ENABLED(CONFIG_USB_CDNSP_HOST) &&
+			    IS_ENABLED(CONFIG_USB_CDNSP_GADGET))
+				dr_mode = USB_DR_MODE_OTG;
+			else if (IS_ENABLED(CONFIG_USB_CDNSP_HOST))
+				dr_mode = USB_DR_MODE_HOST;
+			else if (IS_ENABLED(CONFIG_USB_CDNSP_GADGET))
+				dr_mode = USB_DR_MODE_PERIPHERAL;
+		} else {
+			if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
+			    IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
+				dr_mode = USB_DR_MODE_OTG;
+			else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
+				dr_mode = USB_DR_MODE_HOST;
+			else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
+				dr_mode = USB_DR_MODE_PERIPHERAL;
+		}
+	}
+
+	/*
+	 * At this point cdns->dr_mode contains strap configuration.
+	 * Driver try update this setting considering kernel configuration
+	 */
+	best_dr_mode = cdns->dr_mode;
+
+	ret = cdns_idle_init(cdns);
+	if (ret)
+		return ret;
+
+	if (dr_mode == USB_DR_MODE_OTG) {
+		best_dr_mode = cdns->dr_mode;
+	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
+		best_dr_mode = dr_mode;
+	} else if (cdns->dr_mode != dr_mode) {
+		dev_err(dev, "Incorrect DRD configuration\n");
+		return -EINVAL;
+	}
+
+	dr_mode = best_dr_mode;
+
+	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
+		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);
+			goto err;
+		}
+	}
+
+	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
+		if (cdns->gadget_init)
+			ret = cdns->gadget_init(cdns);
+		else
+			ret = -ENXIO;
+
+		if (ret) {
+			dev_err(dev, "Device initialization failed with %d\n",
+				ret);
+			goto err;
+		}
+	}
+
+	cdns->dr_mode = dr_mode;
+
+	ret = cdns_drd_update_mode(cdns);
+	if (ret)
+		goto err;
+
+	/* Initialize idle role to start with */
+	ret = cdns_role_start(cdns, USB_ROLE_NONE);
+	if (ret)
+		goto err;
+
+	switch (cdns->dr_mode) {
+	case USB_DR_MODE_OTG:
+		ret = cdns_hw_role_switch(cdns);
+		if (ret)
+			goto err;
+		break;
+	case USB_DR_MODE_PERIPHERAL:
+		ret = cdns_role_start(cdns, USB_ROLE_DEVICE);
+		if (ret)
+			goto err;
+		break;
+	case USB_DR_MODE_HOST:
+		ret = cdns_role_start(cdns, USB_ROLE_HOST);
+		if (ret)
+			goto err;
+		break;
+	default:
+		ret = -EINVAL;
+		goto err;
+	}
+
+	return 0;
+err:
+	cdns_exit_roles(cdns);
+	return ret;
+}
+
+/**
+ * cdns_hw_role_state_machine  - role switch state machine based on hw events.
+ * @cdns: Pointer to controller structure.
+ *
+ * Returns next role to be entered based on hw events.
+ */
+static enum usb_role cdns_hw_role_state_machine(struct cdns *cdns)
+{
+	enum usb_role role = USB_ROLE_NONE;
+	int id, vbus;
+
+	if (cdns->dr_mode != USB_DR_MODE_OTG) {
+		if (cdns_is_host(cdns))
+			role = USB_ROLE_HOST;
+		if (cdns_is_device(cdns))
+			role = USB_ROLE_DEVICE;
+
+		return role;
+	}
+
+	id = cdns_get_id(cdns);
+	vbus = cdns_get_vbus(cdns);
+
+	/*
+	 * Role change state machine
+	 * Inputs: ID, VBUS
+	 * Previous state: cdns->role
+	 * Next state: role
+	 */
+	role = cdns->role;
+
+	switch (role) {
+	case USB_ROLE_NONE:
+		/*
+		 * Driver treats USB_ROLE_NONE synonymous to IDLE state from
+		 * controller specification.
+		 */
+		if (!id)
+			role = USB_ROLE_HOST;
+		else if (vbus)
+			role = USB_ROLE_DEVICE;
+		break;
+	case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
+		if (id)
+			role = USB_ROLE_NONE;
+		break;
+	case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
+		if (!vbus)
+			role = USB_ROLE_NONE;
+		break;
+	}
+
+	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
+
+	return role;
+}
+
+static int cdns_idle_role_start(struct cdns *cdns)
+{
+	return 0;
+}
+
+static void cdns_idle_role_stop(struct cdns *cdns)
+{
+	/* Program Lane swap and bring PHY out of RESET */
+	phy_reset(cdns->usb3_phy);
+}
+
+static int cdns_idle_init(struct cdns *cdns)
+{
+	struct cdns_role_driver *rdrv;
+
+	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+	if (!rdrv)
+		return -ENOMEM;
+
+	rdrv->start = cdns_idle_role_start;
+	rdrv->stop = cdns_idle_role_stop;
+	rdrv->state = CDNS_ROLE_STATE_INACTIVE;
+	rdrv->suspend = NULL;
+	rdrv->resume = NULL;
+	rdrv->name = "idle";
+
+	cdns->roles[USB_ROLE_NONE] = rdrv;
+
+	return 0;
+}
+
+/**
+ * cdns_hw_role_switch - switch roles based on HW state
+ * @cdns: controller
+ */
+int cdns_hw_role_switch(struct cdns *cdns)
+{
+	enum usb_role real_role, current_role;
+	int ret = 0;
+
+	/* Depends on role switch class */
+	if (cdns->role_sw)
+		return 0;
+
+	pm_runtime_get_sync(cdns->dev);
+
+	current_role = cdns->role;
+	real_role = cdns_hw_role_state_machine(cdns);
+
+	/* Do nothing if nothing changed */
+	if (current_role == real_role)
+		goto exit;
+
+	cdns_role_stop(cdns);
+
+	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
+
+	ret = cdns_role_start(cdns, real_role);
+	if (ret) {
+		/* Back to current role */
+		dev_err(cdns->dev, "set %d has failed, back to %d\n",
+			real_role, current_role);
+		ret = cdns_role_start(cdns, current_role);
+		if (ret)
+			dev_err(cdns->dev, "back to %d failed too\n",
+				current_role);
+	}
+exit:
+	pm_runtime_put_sync(cdns->dev);
+	return ret;
+}
+
+/**
+ * cdns_role_get - get current role of controller.
+ *
+ * @sw: pointer to USB role switch structure
+ *
+ * Returns role
+ */
+static enum usb_role cdns_role_get(struct usb_role_switch *sw)
+{
+	struct cdns *cdns = usb_role_switch_get_drvdata(sw);
+
+	return cdns->role;
+}
+
+/**
+ * cdns_role_set - set current role of controller.
+ *
+ * @sw: pointer to USB role switch structure
+ * @role: the previous role
+ * Handles below events:
+ * - Role switch for dual-role devices
+ * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
+ */
+static int cdns_role_set(struct usb_role_switch *sw, enum usb_role role)
+{
+	struct cdns *cdns = usb_role_switch_get_drvdata(sw);
+	int ret = 0;
+
+	pm_runtime_get_sync(cdns->dev);
+
+	if (cdns->role == role)
+		goto pm_put;
+
+	if (cdns->dr_mode == USB_DR_MODE_HOST) {
+		switch (role) {
+		case USB_ROLE_NONE:
+		case USB_ROLE_HOST:
+			break;
+		default:
+			goto pm_put;
+		}
+	}
+
+	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {
+		switch (role) {
+		case USB_ROLE_NONE:
+		case USB_ROLE_DEVICE:
+			break;
+		default:
+			goto pm_put;
+		}
+	}
+
+	cdns_role_stop(cdns);
+	ret = cdns_role_start(cdns, role);
+	if (ret)
+		dev_err(cdns->dev, "set role %d has failed\n", role);
+
+pm_put:
+	pm_runtime_put_sync(cdns->dev);
+	return ret;
+}
+
+
+/**
+ * cdns_wakeup_irq - interrupt handler for wakeup events
+ * @irq: irq number for cdns3/cdnsp core device
+ * @data: structure of cdns
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns_wakeup_irq(int irq, void *data)
+{
+	struct cdns *cdns = data;
+
+	if (cdns->in_lpm) {
+		disable_irq_nosync(irq);
+		cdns->wakeup_pending = true;
+		if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)
+			pm_request_resume(&cdns->host_dev->dev);
+
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+/**
+ * cdns_init - probe for cdns3/cdnsp core device
+ * @cdns: Pointer to cdns structure.
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+int cdns_init(struct cdns *cdns)
+{
+	struct device *dev = cdns->dev;
+	int ret;
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(dev, "error setting dma mask: %d\n", ret);
+		return ret;
+	}
+
+	mutex_init(&cdns->mutex);
+
+	if (device_property_read_bool(dev, "usb-role-switch")) {
+		struct usb_role_switch_desc sw_desc = { };
+
+		sw_desc.set = cdns_role_set;
+		sw_desc.get = cdns_role_get;
+		sw_desc.allow_userspace_control = true;
+		sw_desc.driver_data = cdns;
+		sw_desc.fwnode = dev->fwnode;
+
+		cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
+		if (IS_ERR(cdns->role_sw)) {
+			dev_warn(dev, "Unable to register Role Switch\n");
+			return PTR_ERR(cdns->role_sw);
+		}
+	}
+
+	if (cdns->wakeup_irq) {
+		ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,
+						cdns_wakeup_irq,
+						IRQF_SHARED,
+						dev_name(cdns->dev), cdns);
+
+		if (ret) {
+			dev_err(cdns->dev, "couldn't register wakeup irq handler\n");
+			goto role_switch_unregister;
+		}
+	}
+
+	ret = cdns_drd_init(cdns);
+	if (ret)
+		goto init_failed;
+
+	ret = cdns_core_init_role(cdns);
+	if (ret)
+		goto init_failed;
+
+	spin_lock_init(&cdns->lock);
+
+	dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
+
+	return 0;
+init_failed:
+	cdns_drd_exit(cdns);
+role_switch_unregister:
+	if (cdns->role_sw)
+		usb_role_switch_unregister(cdns->role_sw);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cdns_init);
+
+/**
+ * cdns_remove - unbind drd driver and clean up
+ * @cdns: Pointer to cdns structure.
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+int cdns_remove(struct cdns *cdns)
+{
+	cdns_exit_roles(cdns);
+	usb_role_switch_unregister(cdns->role_sw);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cdns_remove);
+
+#ifdef CONFIG_PM_SLEEP
+int cdns_suspend(struct cdns *cdns)
+{
+	struct device *dev = cdns->dev;
+	unsigned long flags;
+
+	if (pm_runtime_status_suspended(dev))
+		pm_runtime_resume(dev);
+
+	if (cdns->roles[cdns->role]->suspend) {
+		spin_lock_irqsave(&cdns->lock, flags);
+		cdns->roles[cdns->role]->suspend(cdns, false);
+		spin_unlock_irqrestore(&cdns->lock, flags);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cdns_suspend);
+
+int cdns_resume(struct cdns *cdns)
+{
+	enum usb_role real_role;
+	bool role_changed = false;
+	int ret = 0;
+
+	if (cdns_power_is_lost(cdns)) {
+		if (cdns->role_sw) {
+			cdns->role = cdns_role_get(cdns->role_sw);
+		} else {
+			real_role = cdns_hw_role_state_machine(cdns);
+			if (real_role != cdns->role) {
+				ret = cdns_hw_role_switch(cdns);
+				if (ret)
+					return ret;
+				role_changed = true;
+			}
+		}
+
+		if (!role_changed) {
+			if (cdns->role == USB_ROLE_HOST)
+				ret = cdns_drd_host_on(cdns);
+			else if (cdns->role == USB_ROLE_DEVICE)
+				ret = cdns_drd_gadget_on(cdns);
+
+			if (ret)
+				return ret;
+		}
+	}
+
+	if (cdns->roles[cdns->role]->resume)
+		cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cdns_resume);
+
+void cdns_set_active(struct cdns *cdns, u8 set_active)
+{
+	struct device *dev = cdns->dev;
+
+	if (set_active) {
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return;
+}
+EXPORT_SYMBOL_GPL(cdns_set_active);
+#endif /* CONFIG_PM_SLEEP */
+
+MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_DESCRIPTION("Cadence USBSS and USBSSP DRD Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
new file mode 100644
index 0000000000..81a9c9d6be
--- /dev/null
+++ b/drivers/usb/cdns3/core.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USBSS and USBSSP DRD Header File.
+ *
+ * Copyright (C) 2017-2018 NXP
+ * Copyright (C) 2018-2019 Cadence.
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ *          Pawel Laszczak <pawell@cadence.com>
+ */
+#ifndef __LINUX_CDNS3_CORE_H
+#define __LINUX_CDNS3_CORE_H
+
+#include <linux/usb/otg.h>
+#include <linux/usb/role.h>
+
+struct cdns;
+
+/**
+ * struct cdns_role_driver - host/gadget role driver
+ * @start: start this role
+ * @stop: stop this role
+ * @suspend: suspend callback for this role
+ * @resume: resume callback for this role
+ * @irq: irq handler for this role
+ * @name: role name string (host/gadget)
+ * @state: current state
+ */
+struct cdns_role_driver {
+	int (*start)(struct cdns *cdns);
+	void (*stop)(struct cdns *cdns);
+	int (*suspend)(struct cdns *cdns, bool do_wakeup);
+	int (*resume)(struct cdns *cdns, bool hibernated);
+	const char *name;
+#define CDNS_ROLE_STATE_INACTIVE	0
+#define CDNS_ROLE_STATE_ACTIVE		1
+	int state;
+};
+
+#define CDNS_XHCI_RESOURCES_NUM	2
+
+struct cdns3_platform_data {
+	int (*platform_suspend)(struct device *dev,
+			bool suspend, bool wakeup);
+	unsigned long quirks;
+#define CDNS3_DEFAULT_PM_RUNTIME_ALLOW	BIT(0)
+};
+
+/**
+ * struct cdns - Representation of Cadence USB3 DRD controller.
+ * @dev: pointer to Cadence device struct
+ * @xhci_regs: pointer to base of xhci registers
+ * @xhci_res: the resource for xhci
+ * @dev_regs: pointer to base of dev registers
+ * @otg_res: the resource for otg
+ * @otg_v0_regs: pointer to base of v0 otg registers
+ * @otg_v1_regs: pointer to base of v1 otg registers
+ * @otg_cdnsp_regs: pointer to base of CDNSP otg registers
+ * @otg_regs: pointer to base of otg registers
+ * @otg_irq_regs: pointer to interrupt registers
+ * @otg_irq: irq number for otg controller
+ * @dev_irq: irq number for device controller
+ * @wakeup_irq: irq number for wakeup event, it is optional
+ * @roles: array of supported roles for this controller
+ * @role: current role
+ * @host_dev: the child host device pointer for cdns core
+ * @gadget_dev: the child gadget device pointer
+ * @usb2_phy: pointer to USB2 PHY
+ * @usb3_phy: pointer to USB3 PHY
+ * @mutex: the mutex for concurrent code at driver
+ * @dr_mode: supported mode of operation it can be only Host, only Device
+ *           or OTG mode that allow to switch between Device and Host mode.
+ *           This field based on firmware setting, kernel configuration
+ *           and hardware configuration.
+ * @role_sw: pointer to role switch object.
+ * @in_lpm: indicate the controller is in low power mode
+ * @wakeup_pending: wakeup interrupt pending
+ * @pdata: platform data from glue layer
+ * @lock: spinlock structure
+ * @xhci_plat_data: xhci private data structure pointer
+ * @gadget_init: pointer to gadget initialization function
+ */
+struct cdns {
+	struct device			*dev;
+	void __iomem			*xhci_regs;
+	struct resource			xhci_res[CDNS_XHCI_RESOURCES_NUM];
+	struct cdns3_usb_regs __iomem	*dev_regs;
+
+	struct resource				otg_res;
+	struct cdns3_otg_legacy_regs __iomem	*otg_v0_regs;
+	struct cdns3_otg_regs __iomem		*otg_v1_regs;
+	struct cdnsp_otg_regs __iomem		*otg_cdnsp_regs;
+	struct cdns_otg_common_regs __iomem	*otg_regs;
+	struct cdns_otg_irq_regs __iomem	*otg_irq_regs;
+#define CDNS3_CONTROLLER_V0	0
+#define CDNS3_CONTROLLER_V1	1
+#define CDNSP_CONTROLLER_V2	2
+	u32				version;
+	bool				phyrst_a_enable;
+
+	int				otg_irq;
+	int				dev_irq;
+	int				wakeup_irq;
+	struct cdns_role_driver	*roles[USB_ROLE_DEVICE + 1];
+	enum usb_role			role;
+	struct platform_device		*host_dev;
+	void				*gadget_dev;
+	struct phy			*usb2_phy;
+	struct phy			*usb3_phy;
+	/* mutext used in workqueue*/
+	struct mutex			mutex;
+	enum usb_dr_mode		dr_mode;
+	struct usb_role_switch		*role_sw;
+	bool				in_lpm;
+	bool				wakeup_pending;
+	struct cdns3_platform_data	*pdata;
+	spinlock_t			lock;
+	struct xhci_plat_priv		*xhci_plat_data;
+
+	int (*gadget_init)(struct cdns *cdns);
+};
+
+int cdns_hw_role_switch(struct cdns *cdns);
+int cdns_init(struct cdns *cdns);
+int cdns_remove(struct cdns *cdns);
+
+#ifdef CONFIG_PM_SLEEP
+int cdns_resume(struct cdns *cdns);
+int cdns_suspend(struct cdns *cdns);
+void cdns_set_active(struct cdns *cdns, u8 set_active);
+#else /* CONFIG_PM_SLEEP */
+static inline int cdns_resume(struct cdns *cdns)
+{ return 0; }
+static inline void cdns_set_active(struct cdns *cdns, u8 set_active) { }
+static inline int cdns_suspend(struct cdns *cdns)
+{ return 0; }
+#endif /* CONFIG_PM_SLEEP */
+#endif /* __LINUX_CDNS3_CORE_H */
diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
new file mode 100644
index 0000000000..04b6d12f2b
--- /dev/null
+++ b/drivers/usb/cdns3/drd.c
@@ -0,0 +1,499 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS and USBSSP DRD Driver.
+ *
+ * Copyright (C) 2018-2020 Cadence.
+ * Copyright (C) 2019 Texas Instruments
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ *         Roger Quadros <rogerq@ti.com>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/iopoll.h>
+#include <linux/usb/otg.h>
+
+#include "drd.h"
+#include "core.h"
+
+/**
+ * cdns_set_mode - change mode of OTG Core
+ * @cdns: pointer to context structure
+ * @mode: selected mode from cdns_role
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static int cdns_set_mode(struct cdns *cdns, enum usb_dr_mode mode)
+{
+	void __iomem  *override_reg;
+	u32 reg;
+
+	switch (mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		break;
+	case USB_DR_MODE_HOST:
+		break;
+	case USB_DR_MODE_OTG:
+		dev_dbg(cdns->dev, "Set controller to OTG mode\n");
+
+		if (cdns->version == CDNSP_CONTROLLER_V2)
+			override_reg = &cdns->otg_cdnsp_regs->override;
+		else if (cdns->version == CDNS3_CONTROLLER_V1)
+			override_reg = &cdns->otg_v1_regs->override;
+		else
+			override_reg = &cdns->otg_v0_regs->ctrl1;
+
+		reg = readl(override_reg);
+
+		if (cdns->version != CDNS3_CONTROLLER_V0)
+			reg |= OVERRIDE_IDPULLUP;
+		else
+			reg |= OVERRIDE_IDPULLUP_V0;
+
+		writel(reg, override_reg);
+
+		if (cdns->version == CDNS3_CONTROLLER_V1) {
+			/*
+			 * Enable work around feature built into the
+			 * controller to address issue with RX Sensitivity
+			 * est (EL_17) for USB2 PHY. The issue only occures
+			 * for 0x0002450D controller version.
+			 */
+			if (cdns->phyrst_a_enable) {
+				reg = readl(&cdns->otg_v1_regs->phyrst_cfg);
+				reg |= PHYRST_CFG_PHYRST_A_ENABLE;
+				writel(reg, &cdns->otg_v1_regs->phyrst_cfg);
+			}
+		}
+
+		/*
+		 * Hardware specification says: "ID_VALUE must be valid within
+		 * 50ms after idpullup is set to '1" so driver must wait
+		 * 50ms before reading this pin.
+		 */
+		usleep_range(50000, 60000);
+		break;
+	default:
+		dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int cdns_get_id(struct cdns *cdns)
+{
+	int id;
+
+	id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;
+	dev_dbg(cdns->dev, "OTG ID: %d", id);
+
+	return id;
+}
+
+int cdns_get_vbus(struct cdns *cdns)
+{
+	int vbus;
+
+	vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID);
+	dev_dbg(cdns->dev, "OTG VBUS: %d", vbus);
+
+	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)
+		return true;
+	else if (cdns_get_id(cdns) == CDNS3_ID_HOST)
+		return true;
+
+	return false;
+}
+
+bool cdns_is_device(struct cdns *cdns)
+{
+	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL)
+		return true;
+	else if (cdns->dr_mode == USB_DR_MODE_OTG)
+		if (cdns_get_id(cdns) == CDNS3_ID_PERIPHERAL)
+			return true;
+
+	return false;
+}
+
+/**
+ * cdns_otg_disable_irq - Disable all OTG interrupts
+ * @cdns: Pointer to controller context structure
+ */
+static void cdns_otg_disable_irq(struct cdns *cdns)
+{
+	writel(0, &cdns->otg_irq_regs->ien);
+}
+
+/**
+ * cdns_otg_enable_irq - enable id and sess_valid interrupts
+ * @cdns: Pointer to controller context structure
+ */
+static void cdns_otg_enable_irq(struct cdns *cdns)
+{
+	writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT |
+	       OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_irq_regs->ien);
+}
+
+/**
+ * cdns_drd_host_on - start host.
+ * @cdns: Pointer to controller context structure.
+ *
+ * Returns 0 on success otherwise negative errno.
+ */
+int cdns_drd_host_on(struct cdns *cdns)
+{
+	u32 val, ready_bit;
+	int ret;
+
+	/* Enable host mode. */
+	writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
+	       &cdns->otg_regs->cmd);
+
+	if (cdns->version == CDNSP_CONTROLLER_V2)
+		ready_bit = OTGSTS_CDNSP_XHCI_READY;
+	else
+		ready_bit = OTGSTS_CDNS3_XHCI_READY;
+
+	dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
+	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
+					val & ready_bit, 1, 100000);
+
+	if (ret)
+		dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
+
+	phy_set_mode(cdns->usb2_phy, PHY_MODE_USB_HOST);
+	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_HOST);
+	return ret;
+}
+
+/**
+ * cdns_drd_host_off - stop host.
+ * @cdns: Pointer to controller context structure.
+ */
+void cdns_drd_host_off(struct cdns *cdns)
+{
+	u32 val;
+
+	writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
+	       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
+	       &cdns->otg_regs->cmd);
+
+	/* Waiting till H_IDLE state.*/
+	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
+				  !(val & OTGSTATE_HOST_STATE_MASK),
+				  1, 2000000);
+	phy_set_mode(cdns->usb2_phy, PHY_MODE_INVALID);
+	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);
+}
+
+/**
+ * cdns_drd_gadget_on - start gadget.
+ * @cdns: Pointer to controller context structure.
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+int cdns_drd_gadget_on(struct cdns *cdns)
+{
+	u32 reg = OTGCMD_OTG_DIS;
+	u32 ready_bit;
+	int ret, val;
+
+	/* switch OTG core */
+	writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
+
+	dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
+
+	if (cdns->version == CDNSP_CONTROLLER_V2)
+		ready_bit = OTGSTS_CDNSP_DEV_READY;
+	else
+		ready_bit = OTGSTS_CDNS3_DEV_READY;
+
+	ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
+					val & ready_bit, 1, 100000);
+	if (ret) {
+		dev_err(cdns->dev, "timeout waiting for dev_ready\n");
+		return ret;
+	}
+
+	phy_set_mode(cdns->usb2_phy, PHY_MODE_USB_DEVICE);
+	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_DEVICE);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cdns_drd_gadget_on);
+
+/**
+ * cdns_drd_gadget_off - stop gadget.
+ * @cdns: Pointer to controller context structure.
+ */
+void cdns_drd_gadget_off(struct cdns *cdns)
+{
+	u32 val;
+
+	/*
+	 * Driver should wait at least 10us after disabling Device
+	 * before turning-off Device (DEV_BUS_DROP).
+	 */
+	usleep_range(20, 30);
+	writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
+	       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
+	       &cdns->otg_regs->cmd);
+	/* Waiting till DEV_IDLE state.*/
+	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
+				  !(val & OTGSTATE_DEV_STATE_MASK),
+				  1, 2000000);
+	phy_set_mode(cdns->usb2_phy, PHY_MODE_INVALID);
+	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);
+}
+EXPORT_SYMBOL_GPL(cdns_drd_gadget_off);
+
+/**
+ * cdns_init_otg_mode - initialize drd controller
+ * @cdns: Pointer to controller context structure
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static int cdns_init_otg_mode(struct cdns *cdns)
+{
+	int ret;
+
+	cdns_otg_disable_irq(cdns);
+	/* clear all interrupts */
+	writel(~0, &cdns->otg_irq_regs->ivect);
+
+	ret = cdns_set_mode(cdns, USB_DR_MODE_OTG);
+	if (ret)
+		return ret;
+
+	cdns_otg_enable_irq(cdns);
+
+	return 0;
+}
+
+/**
+ * cdns_drd_update_mode - initialize mode of operation
+ * @cdns: Pointer to controller context structure
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+int cdns_drd_update_mode(struct cdns *cdns)
+{
+	int ret;
+
+	switch (cdns->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		ret = cdns_set_mode(cdns, USB_DR_MODE_PERIPHERAL);
+		break;
+	case USB_DR_MODE_HOST:
+		ret = cdns_set_mode(cdns, USB_DR_MODE_HOST);
+		break;
+	case USB_DR_MODE_OTG:
+		ret = cdns_init_otg_mode(cdns);
+		break;
+	default:
+		dev_err(cdns->dev, "Unsupported mode of operation %d\n",
+			cdns->dr_mode);
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static irqreturn_t cdns_drd_thread_irq(int irq, void *data)
+{
+	struct cdns *cdns = data;
+
+	cdns_hw_role_switch(cdns);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * cdns_drd_irq - interrupt handler for OTG events
+ *
+ * @irq: irq number for cdns core device
+ * @data: structure of cdns
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns_drd_irq(int irq, void *data)
+{
+	irqreturn_t ret = IRQ_NONE;
+	struct cdns *cdns = data;
+	u32 reg;
+
+	if (cdns->dr_mode != USB_DR_MODE_OTG)
+		return IRQ_NONE;
+
+	if (cdns->in_lpm)
+		return ret;
+
+	reg = readl(&cdns->otg_irq_regs->ivect);
+
+	if (!reg)
+		return IRQ_NONE;
+
+	if (reg & OTGIEN_ID_CHANGE_INT) {
+		dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n",
+			cdns_get_id(cdns));
+
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	if (reg & (OTGIEN_VBUSVALID_RISE_INT | OTGIEN_VBUSVALID_FALL_INT)) {
+		dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n",
+			cdns_get_vbus(cdns));
+
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	writel(~0, &cdns->otg_irq_regs->ivect);
+	return ret;
+}
+
+int cdns_drd_init(struct cdns *cdns)
+{
+	void __iomem *regs;
+	u32 state;
+	int ret;
+
+	regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	/* Detection of DRD version. Controller has been released
+	 * in three versions. All are very similar and are software compatible,
+	 * but they have same changes in register maps.
+	 * The first register in oldest version is command register and it's
+	 * read only. Driver should read 0 from it. On the other hand, in v1
+	 * and v2 the first register contains device ID number which is not
+	 * set to 0. Driver uses this fact to detect the proper version of
+	 * controller.
+	 */
+	cdns->otg_v0_regs = regs;
+	if (!readl(&cdns->otg_v0_regs->cmd)) {
+		cdns->version  = CDNS3_CONTROLLER_V0;
+		cdns->otg_v1_regs = NULL;
+		cdns->otg_cdnsp_regs = NULL;
+		cdns->otg_regs = regs;
+		cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem  *)
+				     &cdns->otg_v0_regs->ien;
+		writel(1, &cdns->otg_v0_regs->simulate);
+		dev_dbg(cdns->dev, "DRD version v0 (%08x)\n",
+			 readl(&cdns->otg_v0_regs->version));
+	} else {
+		cdns->otg_v0_regs = NULL;
+		cdns->otg_v1_regs = regs;
+		cdns->otg_cdnsp_regs = regs;
+
+		cdns->otg_regs = (void __iomem *)&cdns->otg_v1_regs->cmd;
+
+		if (readl(&cdns->otg_cdnsp_regs->did) == OTG_CDNSP_DID) {
+			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
+					      &cdns->otg_cdnsp_regs->ien;
+			cdns->version  = CDNSP_CONTROLLER_V2;
+		} else {
+			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
+					      &cdns->otg_v1_regs->ien;
+			writel(1, &cdns->otg_v1_regs->simulate);
+			cdns->version  = CDNS3_CONTROLLER_V1;
+		}
+
+		dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",
+			 readl(&cdns->otg_v1_regs->did),
+			 readl(&cdns->otg_v1_regs->rid));
+	}
+
+	state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));
+
+	/* Update dr_mode according to STRAP configuration. */
+	cdns->dr_mode = USB_DR_MODE_OTG;
+
+	if ((cdns->version == CDNSP_CONTROLLER_V2 &&
+	     state == OTGSTS_CDNSP_STRAP_HOST) ||
+	    (cdns->version != CDNSP_CONTROLLER_V2 &&
+	     state == OTGSTS_STRAP_HOST)) {
+		dev_dbg(cdns->dev, "Controller strapped to HOST\n");
+		cdns->dr_mode = USB_DR_MODE_HOST;
+	} else if ((cdns->version == CDNSP_CONTROLLER_V2 &&
+		    state == OTGSTS_CDNSP_STRAP_GADGET) ||
+		   (cdns->version != CDNSP_CONTROLLER_V2 &&
+		    state == OTGSTS_STRAP_GADGET)) {
+		dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");
+		cdns->dr_mode = USB_DR_MODE_PERIPHERAL;
+	}
+
+	ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq,
+					cdns_drd_irq,
+					cdns_drd_thread_irq,
+					IRQF_SHARED,
+					dev_name(cdns->dev), cdns);
+	if (ret) {
+		dev_err(cdns->dev, "couldn't get otg_irq\n");
+		return ret;
+	}
+
+	state = readl(&cdns->otg_regs->sts);
+	if (OTGSTS_OTG_NRDY(state)) {
+		dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+int cdns_drd_exit(struct cdns *cdns)
+{
+	cdns_otg_disable_irq(cdns);
+
+	return 0;
+}
+
+
+/* Indicate the cdns3 core was power lost before */
+bool cdns_power_is_lost(struct cdns *cdns)
+{
+	if (cdns->version == CDNS3_CONTROLLER_V0) {
+		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
+			return true;
+	} else {
+		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
+			return true;
+	}
+	return false;
+}
+EXPORT_SYMBOL_GPL(cdns_power_is_lost);
diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
new file mode 100644
index 0000000000..cbdf94f73e
--- /dev/null
+++ b/drivers/usb/cdns3/drd.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USB3 and USBSSP DRD header file.
+ *
+ * Copyright (C) 2018-2020 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+#ifndef __LINUX_CDNS3_DRD
+#define __LINUX_CDNS3_DRD
+
+#include <linux/usb/otg.h>
+#include "core.h"
+
+/*  DRD register interface for version v1 of cdns3 driver. */
+struct cdns3_otg_regs {
+	__le32 did;
+	__le32 rid;
+	__le32 capabilities;
+	__le32 reserved1;
+	__le32 cmd;
+	__le32 sts;
+	__le32 state;
+	__le32 reserved2;
+	__le32 ien;
+	__le32 ivect;
+	__le32 refclk;
+	__le32 tmr;
+	__le32 reserved3[4];
+	__le32 simulate;
+	__le32 override;
+	__le32 susp_ctrl;
+	__le32 phyrst_cfg;
+	__le32 anasts;
+	__le32 adp_ramp_time;
+	__le32 ctrl1;
+	__le32 ctrl2;
+};
+
+/*  DRD register interface for version v0 of cdns3 driver. */
+struct cdns3_otg_legacy_regs {
+	__le32 cmd;
+	__le32 sts;
+	__le32 state;
+	__le32 refclk;
+	__le32 ien;
+	__le32 ivect;
+	__le32 reserved1[3];
+	__le32 tmr;
+	__le32 reserved2[2];
+	__le32 version;
+	__le32 capabilities;
+	__le32 reserved3[2];
+	__le32 simulate;
+	__le32 reserved4[5];
+	__le32 ctrl1;
+};
+
+/* DRD register interface for cdnsp driver */
+struct cdnsp_otg_regs {
+	__le32 did;
+	__le32 rid;
+	__le32 cfgs1;
+	__le32 cfgs2;
+	__le32 cmd;
+	__le32 sts;
+	__le32 state;
+	__le32 ien;
+	__le32 ivect;
+	__le32 tmr;
+	__le32 simulate;
+	__le32 adpbc_sts;
+	__le32 adp_ramp_time;
+	__le32 adpbc_ctrl1;
+	__le32 adpbc_ctrl2;
+	__le32 override;
+	__le32 vbusvalid_dbnc_cfg;
+	__le32 sessvalid_dbnc_cfg;
+	__le32 susp_timing_ctrl;
+};
+
+#define OTG_CDNSP_DID	0x0004034E
+
+/*
+ * Common registers interface for both CDNS3 and CDNSP version of DRD.
+ */
+struct cdns_otg_common_regs {
+	__le32 cmd;
+	__le32 sts;
+	__le32 state;
+};
+
+/*
+ * Interrupt related registers. This registers are mapped in different
+ * location for CDNSP controller.
+ */
+struct cdns_otg_irq_regs {
+	__le32 ien;
+	__le32 ivect;
+};
+
+/* CDNS_RID - bitmasks */
+#define CDNS_RID(p)			((p) & GENMASK(15, 0))
+
+/* CDNS_VID - bitmasks */
+#define CDNS_DID(p)			((p) & GENMASK(31, 0))
+
+/* OTGCMD - bitmasks */
+/* "Request the bus for Device mode. */
+#define OTGCMD_DEV_BUS_REQ		BIT(0)
+/* Request the bus for Host mode */
+#define OTGCMD_HOST_BUS_REQ		BIT(1)
+/* Enable OTG mode. */
+#define OTGCMD_OTG_EN			BIT(2)
+/* Disable OTG mode */
+#define OTGCMD_OTG_DIS			BIT(3)
+/*"Configure OTG as A-Device. */
+#define OTGCMD_A_DEV_EN			BIT(4)
+/*"Configure OTG as A-Device. */
+#define OTGCMD_A_DEV_DIS		BIT(5)
+/* Drop the bus for Device mod	e. */
+#define OTGCMD_DEV_BUS_DROP		BIT(8)
+/* Drop the bus for Host mode*/
+#define OTGCMD_HOST_BUS_DROP		BIT(9)
+/* Power Down USBSS-DEV - only for CDNS3.*/
+#define OTGCMD_DEV_POWER_OFF		BIT(11)
+/* Power Down CDNSXHCI - only for CDNS3. */
+#define OTGCMD_HOST_POWER_OFF		BIT(12)
+
+/* OTGIEN - bitmasks */
+/* ID change interrupt enable */
+#define OTGIEN_ID_CHANGE_INT		BIT(0)
+/* Vbusvalid fall detected interrupt enable.*/
+#define OTGIEN_VBUSVALID_RISE_INT	BIT(4)
+/* Vbusvalid fall detected interrupt enable */
+#define OTGIEN_VBUSVALID_FALL_INT	BIT(5)
+
+/* OTGSTS - bitmasks */
+/*
+ * Current value of the ID pin. It is only valid when idpullup in
+ *  OTGCTRL1_TYPE register is set to '1'.
+ */
+#define OTGSTS_ID_VALUE			BIT(0)
+/* Current value of the vbus_valid */
+#define OTGSTS_VBUS_VALID		BIT(1)
+/* Current value of the b_sess_vld */
+#define OTGSTS_SESSION_VALID		BIT(2)
+/*Device mode is active*/
+#define OTGSTS_DEV_ACTIVE		BIT(3)
+/* Host mode is active. */
+#define OTGSTS_HOST_ACTIVE		BIT(4)
+/* OTG Controller not ready. */
+#define OTGSTS_OTG_NRDY_MASK		BIT(11)
+#define OTGSTS_OTG_NRDY(p)		((p) & OTGSTS_OTG_NRDY_MASK)
+/*
+ * Value of the strap pins for:
+ * CDNS3:
+ * 000 - no default configuration
+ * 010 - Controller initiall configured as Host
+ * 100 - Controller initially configured as Device
+ * CDNSP:
+ * 000 - No default configuration.
+ * 010 - Controller initiall configured as Host.
+ * 100 - Controller initially configured as Device.
+ */
+#define OTGSTS_STRAP(p)			(((p) & GENMASK(14, 12)) >> 12)
+#define OTGSTS_STRAP_NO_DEFAULT_CFG	0x00
+#define OTGSTS_STRAP_HOST_OTG		0x01
+#define OTGSTS_STRAP_HOST		0x02
+#define OTGSTS_STRAP_GADGET		0x04
+#define OTGSTS_CDNSP_STRAP_HOST		0x01
+#define OTGSTS_CDNSP_STRAP_GADGET	0x02
+
+/* Host mode is turned on. */
+#define OTGSTS_CDNS3_XHCI_READY		BIT(26)
+#define OTGSTS_CDNSP_XHCI_READY		BIT(27)
+
+/* "Device mode is turned on .*/
+#define OTGSTS_CDNS3_DEV_READY		BIT(27)
+#define OTGSTS_CDNSP_DEV_READY		BIT(26)
+
+/* OTGSTATE- bitmasks */
+#define OTGSTATE_DEV_STATE_MASK		GENMASK(2, 0)
+#define OTGSTATE_HOST_STATE_MASK	GENMASK(5, 3)
+#define OTGSTATE_HOST_STATE_IDLE	0x0
+#define OTGSTATE_HOST_STATE_VBUS_FALL	0x7
+#define OTGSTATE_HOST_STATE(p)		(((p) & OTGSTATE_HOST_STATE_MASK) >> 3)
+
+/* OTGREFCLK - bitmasks */
+#define OTGREFCLK_STB_CLK_SWITCH_EN	BIT(31)
+
+/* OVERRIDE - bitmasks */
+#define OVERRIDE_IDPULLUP		BIT(0)
+/* Only for CDNS3_CONTROLLER_V0 version */
+#define OVERRIDE_IDPULLUP_V0		BIT(24)
+/* Vbusvalid/Sesvalid override select. */
+#define OVERRIDE_SESS_VLD_SEL		BIT(10)
+
+/* PHYRST_CFG - bitmasks */
+#define PHYRST_CFG_PHYRST_A_ENABLE     BIT(0)
+
+#define CDNS3_ID_PERIPHERAL		1
+#define CDNS3_ID_HOST			0
+
+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);
+int cdns_drd_gadget_on(struct cdns *cdns);
+void cdns_drd_gadget_off(struct cdns *cdns);
+int cdns_drd_host_on(struct cdns *cdns);
+void cdns_drd_host_off(struct cdns *cdns);
+bool cdns_power_is_lost(struct cdns *cdns);
+#endif /* __LINUX_CDNS3_DRD */
diff --git a/drivers/usb/cdns3/gadget-export.h b/drivers/usb/cdns3/gadget-export.h
new file mode 100644
index 0000000000..c37b6269b0
--- /dev/null
+++ b/drivers/usb/cdns3/gadget-export.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USBSS and USBSSP DRD Driver - Gadget Export APIs.
+ *
+ * Copyright (C) 2017 NXP
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ */
+#ifndef __LINUX_CDNS3_GADGET_EXPORT
+#define __LINUX_CDNS3_GADGET_EXPORT
+
+#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
+
+static inline int cdns3_gadget_init(struct cdns *cdns)
+{
+	return -ENXIO;
+}
+
+#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
new file mode 100644
index 0000000000..cf92173ecf
--- /dev/null
+++ b/drivers/usb/cdns3/host-export.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USBSS and USBSSP DRD Driver - Host Export APIs
+ *
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ */
+#ifndef __LINUX_CDNS3_HOST_EXPORT
+#define __LINUX_CDNS3_HOST_EXPORT
+
+#if IS_ENABLED(CONFIG_USB_CDNS_HOST)
+
+int cdns_host_init(struct cdns *cdns);
+
+#else
+
+static inline int cdns_host_init(struct cdns *cdns)
+{
+	return -ENXIO;
+}
+
+static inline void cdns_host_exit(struct cdns *cdns) { }
+
+#endif /* USB_CDNS_HOST */
+
+#endif /* __LINUX_CDNS3_HOST_EXPORT */
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
new file mode 100644
index 0000000000..6164fc4c96
--- /dev/null
+++ b/drivers/usb/cdns3/host.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS and USBSSP DRD Driver - host side
+ *
+ * Copyright (C) 2018-2019 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ *          Pawel Laszczak <pawell@cadence.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "core.h"
+#include "drd.h"
+#include "host-export.h"
+#include <linux/usb/hcd.h>
+#include "../host/xhci.h"
+#include "../host/xhci-plat.h"
+
+#define XECP_PORT_CAP_REG	0x8000
+#define XECP_AUX_CTRL_REG1	0x8120
+
+#define CFG_RXDET_P3_EN		BIT(15)
+#define LPM_2_STB_SWITCH_EN	BIT(25)
+
+static void xhci_cdns3_plat_start(struct usb_hcd *hcd)
+{
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	u32 value;
+
+	/* set usbcmd.EU3S */
+	value = readl(&xhci->op_regs->command);
+	value |= CMD_PM_INDEX;
+	writel(value, &xhci->op_regs->command);
+
+	if (hcd->regs) {
+		value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
+		value |= CFG_RXDET_P3_EN;
+		writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
+
+		value = readl(hcd->regs + XECP_PORT_CAP_REG);
+		value |= LPM_2_STB_SWITCH_EN;
+		writel(value, hcd->regs + XECP_PORT_CAP_REG);
+	}
+}
+
+static int xhci_cdns3_resume_quirk(struct usb_hcd *hcd)
+{
+	xhci_cdns3_plat_start(hcd);
+	return 0;
+}
+
+static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
+	.quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
+	.plat_start = xhci_cdns3_plat_start,
+	.resume_quirk = xhci_cdns3_resume_quirk,
+};
+
+static int __cdns_host_init(struct cdns *cdns)
+{
+	struct platform_device *xhci;
+	int ret;
+	struct usb_hcd *hcd;
+
+	cdns_drd_host_on(cdns);
+
+	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
+	if (!xhci) {
+		dev_err(cdns->dev, "couldn't allocate xHCI device\n");
+		return -ENOMEM;
+	}
+
+	xhci->dev.parent = cdns->dev;
+	cdns->host_dev = xhci;
+
+	ret = platform_device_add_resources(xhci, cdns->xhci_res,
+					    CDNS_XHCI_RESOURCES_NUM);
+	if (ret) {
+		dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
+		goto err1;
+	}
+
+	cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
+			sizeof(struct xhci_plat_priv), GFP_KERNEL);
+	if (!cdns->xhci_plat_data) {
+		ret = -ENOMEM;
+		goto err1;
+	}
+
+	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
+		cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
+
+	ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
+			sizeof(struct xhci_plat_priv));
+	if (ret)
+		goto free_memory;
+
+	ret = platform_device_add(xhci);
+	if (ret) {
+		dev_err(cdns->dev, "failed to register xHCI device\n");
+		goto free_memory;
+	}
+
+	/* Glue needs to access xHCI region register for Power management */
+	hcd = platform_get_drvdata(xhci);
+	if (hcd)
+		cdns->xhci_regs = hcd->regs;
+
+	return 0;
+
+free_memory:
+	kfree(cdns->xhci_plat_data);
+err1:
+	platform_device_put(xhci);
+	return ret;
+}
+
+static void cdns_host_exit(struct cdns *cdns)
+{
+	kfree(cdns->xhci_plat_data);
+	platform_device_unregister(cdns->host_dev);
+	cdns->host_dev = NULL;
+	cdns_drd_host_off(cdns);
+}
+
+int cdns_host_init(struct cdns *cdns)
+{
+	struct cdns_role_driver *rdrv;
+
+	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+	if (!rdrv)
+		return -ENOMEM;
+
+	rdrv->start	= __cdns_host_init;
+	rdrv->stop	= cdns_host_exit;
+	rdrv->state	= CDNS_ROLE_STATE_INACTIVE;
+	rdrv->name	= "host";
+
+	cdns->roles[USB_ROLE_HOST] = rdrv;
+
+	return 0;
+}