diff --git a/drivers/usb/usbssp/gadget.c b/drivers/usb/usbssp/gadget.c
new file mode 100644
index 000000000000..151e451f9909
--- /dev/null
+++ b/drivers/usb/usbssp/gadget.c
@@ -0,0 +1,2082 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ * Some code borrowed from the Linux XHCI driver.
+ */
+
+#include <linux/pci.h>
+#include <linux/irq.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/dmi.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+
+#include "gadget-trace.h"
+#include "gadget-debugfs.h"
+#include "gadget.h"
+
+u64 usbssp_get_hw_deq(struct usbssp_udc *usbssp_data,
+		      struct usbssp_device *dev,
+		      unsigned int ep_index, unsigned int stream_id);
+
+void usbssp_bottom_irq(struct work_struct *work)
+{
+	struct usbssp_udc *usbssp_data = container_of(work, struct usbssp_udc,
+						bottom_irq);
+
+	usbssp_dbg(usbssp_data, "===== Bottom IRQ handler start ====\n");
+
+	if (usbssp_data->usbssp_state & USBSSP_STATE_DYING) {
+		usbssp_err(usbssp_data, "Device controller dying\n");
+		return;
+	}
+
+	mutex_lock(&usbssp_data->mutex);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	if (usbssp_data->defered_event & EVENT_DEV_DISCONECTED) {
+		usbssp_dbg(usbssp_data, "Disconnecting device sequence\n");
+		usbssp_data->defered_event &= ~EVENT_DEV_DISCONECTED;
+		usbssp_data->usbssp_state |= USBSSP_STATE_DISCONNECT_PENDING;
+		usbssp_stop_device(usbssp_data, 0);
+
+	//time needed for disconnect
+	usbssp_gadget_disconnect_interrupt(usbssp_data);
+	usbssp_data->gadget.speed = USB_SPEED_UNKNOWN;
+	usb_gadget_set_state(&usbssp_data->gadget, USB_STATE_NOTATTACHED);
+
+	usbssp_dbg(usbssp_data, "Wait for disconnect\n");
+
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+				usbssp_data->irq_thread_flag);
+	/*fixme: should be replaced by wait_for_completion*/
+	msleep(200);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+	}
+
+	if (usbssp_data->defered_event & EVENT_DEV_CONNECTED) {
+		usbssp_dbg(usbssp_data, "Connecting device sequence\n");
+	if (usbssp_data->usbssp_state & USBSSP_STATE_DISCONNECT_PENDING) {
+		usbssp_free_dev(usbssp_data);
+		usbssp_data->usbssp_state &= ~USBSSP_STATE_DISCONNECT_PENDING;
+	}
+
+	usbssp_data->defered_event &= ~EVENT_DEV_CONNECTED;
+		usbssp_alloc_dev(usbssp_data);
+	}
+
+	if (usbssp_data->defered_event & EVENT_USB_RESET) {
+		__le32 __iomem *port_regs;
+		u32 temp;
+
+		usbssp_dbg(usbssp_data, "Beginning USB reset device sequence\n");
+
+		/*Reset Device Command*/
+		usbssp_data->defered_event &= ~EVENT_USB_RESET;
+		usbssp_reset_device(usbssp_data);
+		usbssp_data->devs.eps[0].ep_state |= USBSSP_EP_ENABLED;
+		usbssp_data->defered_event &= ~EVENT_DEV_CONNECTED;
+
+		usbssp_enable_device(usbssp_data);
+		if ((usbssp_data->gadget.speed == USB_SPEED_SUPER) ||
+		    (usbssp_data->gadget.speed == USB_SPEED_SUPER_PLUS)) {
+			usbssp_dbg(usbssp_data, "Set U1/U2 enable\n");
+			port_regs = usbssp_get_port_io_addr(usbssp_data);
+			temp = readl(port_regs+PORTPMSC);
+			temp &= ~(PORT_U1_TIMEOUT_MASK | PORT_U2_TIMEOUT_MASK);
+			temp |= PORT_U1_TIMEOUT(1) | PORT_U2_TIMEOUT(1);
+			writel(temp, port_regs+PORTPMSC);
+		}
+	}
+
+	/*handle setup packet*/
+	if (usbssp_data->defered_event & EVENT_SETUP_PACKET) {
+		usbssp_dbg(usbssp_data, "Beginning handling SETUP packet\n");
+		usbssp_data->defered_event &= ~EVENT_SETUP_PACKET;
+		usbssp_setup_analyze(usbssp_data);
+	}
+
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+				usbssp_data->irq_thread_flag);
+	mutex_unlock(&usbssp_data->mutex);
+	usbssp_dbg(usbssp_data, "===== Bottom IRQ handler end ====\n");
+}
+
+/*
+ * usbssp_handshake - spin reading dc until handshake completes or fails
+ * @ptr: address of dc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done). There are two failure modes: "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ */
+int usbssp_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
+{
+	u32	result;
+
+	do {
+		result = readl(ptr);
+		if (result == ~(u32)0)	/* card removed */
+			return -ENODEV;
+		result &= mask;
+		if (result == done)
+			return 0;
+		udelay(1);
+		usec--;
+	} while (usec > 0);
+	return -ETIMEDOUT;
+}
+
+/*
+ * Disable interrupts and begin the DC halting process.
+ */
+void usbssp_quiesce(struct usbssp_udc *usbssp_data)
+{
+	u32 halted;
+	u32 cmd;
+	u32 mask;
+
+	mask = ~(USBSSP_IRQS);
+
+	halted = readl(&usbssp_data->op_regs->status) & STS_HALT;
+	if (!halted)
+		mask &= ~CMD_RUN;
+
+	cmd = readl(&usbssp_data->op_regs->command);
+	cmd &= mask;
+	writel(cmd, &usbssp_data->op_regs->command);
+}
+
+/*
+ * Force DC into halt state.
+ *
+ * Disable any IRQs and clear the run/stop bit.
+ * USBSSP will complete any current and actively pipelined transactions, and
+ * should halt within 16 ms of the run/stop bit being cleared.
+ * Read DC Halted bit in the status register to see when the DC is finished.
+ */
+int usbssp_halt(struct usbssp_udc *usbssp_data)
+{
+	int ret;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			 "// Halt the USBSSP");
+	usbssp_quiesce(usbssp_data);
+
+	ret = usbssp_handshake(&usbssp_data->op_regs->status,
+		STS_HALT, STS_HALT, USBSSP_MAX_HALT_USEC);
+
+	if (!ret) {
+		usbssp_warn(usbssp_data, "Device halt failed, %d\n", ret);
+		return ret;
+	}
+
+	usbssp_data->usbssp_state |= USBSSP_STATE_HALTED;
+	usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
+	return ret;
+}
+
+/*
+ * Set the run bit and wait for the device to be running.
+ */
+int usbssp_start(struct usbssp_udc *usbssp_data)
+{
+	u32 temp;
+	int ret;
+
+	temp = readl(&usbssp_data->op_regs->command);
+	temp |= (CMD_RUN | CMD_DEVEN);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"// Turn on USBSSP, cmd = 0x%x.", temp);
+	writel(temp, &usbssp_data->op_regs->command);
+
+	/*
+	 * Wait for the HCHalted Staus bit to be 0 to indicate the device is
+	 * running.
+	 */
+	ret = usbssp_handshake(&usbssp_data->op_regs->status,
+			STS_HALT, 0, USBSSP_MAX_HALT_USEC);
+
+	if (ret == -ETIMEDOUT)
+		usbssp_err(usbssp_data, "Device took too long to start, waited %u microseconds.\n",
+			USBSSP_MAX_HALT_USEC);
+	if (!ret)
+		/* clear state flags. Including dying, halted or removing */
+		usbssp_data->usbssp_state = 0;
+
+	return ret;
+}
+
+/*
+ * Reset a halted DC.
+ *
+ * This resets pipelines, timers, counters, state machines, etc.
+ * Transactions will be terminated immediately, and operational registers
+ * will be set to their defaults.
+ */
+int usbssp_reset(struct usbssp_udc *usbssp_data)
+{
+	u32 command;
+	u32 state;
+	int ret;
+
+	state = readl(&usbssp_data->op_regs->status);
+
+	if (state == ~(u32)0) {
+		usbssp_warn(usbssp_data, "Device not accessible, reset failed.\n");
+		return -ENODEV;
+	}
+
+	if ((state & STS_HALT) == 0) {
+		usbssp_warn(usbssp_data, "DC not halted, aborting reset.\n");
+		return 0;
+	}
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "// Reset the DC");
+	command = readl(&usbssp_data->op_regs->command);
+	command |= CMD_RESET;
+	writel(command, &usbssp_data->op_regs->command);
+
+	ret = usbssp_handshake(&usbssp_data->op_regs->command,
+			CMD_RESET, 0, 10 * 1000 * 1000);
+
+	if (ret)
+		return ret;
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+		"Wait for controller to be ready for doorbell rings");
+	/*
+	 * USBSSP cannot write to any doorbells or operational registers other
+	 * than status until the "Controller Not Ready" flag is cleared.
+	 */
+	ret = usbssp_handshake(&usbssp_data->op_regs->status,
+			STS_CNR, 0, 10 * 1000 * 1000);
+
+	return ret;
+}
+
+static inline int usbssp_try_enable_msi(struct usbssp_udc *usbssp_data)
+{
+	usbssp_data->msi_enabled = 1;
+	return 0;
+}
+
+static inline void usbssp_cleanup_msix(struct usbssp_udc *usbssp_data)
+{
+	/*TODO*/
+}
+
+static inline void usbssp_msix_sync_irqs(struct usbssp_udc *usbssp_data)
+{
+	/*TODO*/
+}
+
+/*
+ * Initialize memory for gadget driver and USBSSP (one-time init).
+ *
+ * Program the PAGESIZE register, initialize the device context array, create
+ * device contexts, set up a command ring segment (or two?), create event
+ * ring (one for now).
+ */
+int usbssp_init(struct usbssp_udc *usbssp_data)
+{
+	int retval = 0;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "usbssp_init");
+
+	spin_lock_init(&usbssp_data->lock);
+	spin_lock_init(&usbssp_data->irq_thread_lock);
+	retval = usbssp_mem_init(usbssp_data, GFP_KERNEL);
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"Finished usbssp_init");
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+static int usbssp_run_finished(struct usbssp_udc *usbssp_data)
+{
+	if (usbssp_start(usbssp_data)) {
+		usbssp_halt(usbssp_data);
+		return -ENODEV;
+	}
+//	usbssp_data->usbssp_state = USBSSP_STATE_RUNNING;
+	usbssp_data->cmd_ring_state = CMD_RING_STATE_RUNNING;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"Finished usbssp_run for USB3 device");
+	return 0;
+}
+
+/*
+ * Start the USBSSP after it was halted.
+ *
+ * This function is called by the usbssp_gadget_start function when the
+ * gadget driver is started. Its opposite is usbssp_stop().
+ *
+ * usbssp_init() must be called once before this function can be called.
+ * Reset the USBSSP, enable device slot contexts, program DCBAAP, and
+ * set command ring pointer and event ring pointer.
+ */
+int usbssp_run(struct usbssp_udc *usbssp_data)
+{
+	u32 temp;
+	u64 temp_64;
+	int ret;
+	__le32 __iomem	*portsc;
+	u32 portsc_val = 0;
+	int i = 0;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "usbssp_run");
+
+	ret = usbssp_try_enable_msi(usbssp_data);
+	if (ret)
+		return ret;
+
+	temp_64 = usbssp_read_64(usbssp_data,
+				 &usbssp_data->ir_set->erst_dequeue);
+	temp_64 &= ~ERST_PTR_MASK;
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"ERST deq = 64'h%0lx",
+			(unsigned long int) temp_64);
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+		"// Set the interrupt modulation register");
+	temp = readl(&usbssp_data->ir_set->irq_control);
+	temp &= ~ER_IRQ_INTERVAL_MASK;
+	temp |= (usbssp_data->imod_interval / 250) & ER_IRQ_INTERVAL_MASK;
+	writel(temp, &usbssp_data->ir_set->irq_control);
+
+	/******************************************/
+	//enable USB2 port
+	for (i = 0; i < usbssp_data->num_usb2_ports; i++) {
+		portsc = usbssp_data->usb2_ports + PORTSC;
+		portsc_val = readl(portsc) & ~PORT_PLS_MASK;
+		portsc_val = portsc_val | (5 << 5) | PORT_LINK_STROBE;
+		writel(portsc_val, portsc);
+	}
+
+	//enable USB3.0 port
+	for (i = 0; i < usbssp_data->num_usb3_ports; i++) {
+		portsc = usbssp_data->usb3_ports + PORTSC;
+		portsc_val = readl(portsc) & ~PORT_PLS_MASK;
+		portsc_val = portsc_val | (5 << 5) | PORT_LINK_STROBE;
+		writel(portsc_val, portsc);
+	}
+
+	if (usbssp_start(usbssp_data)) {
+		usbssp_halt(usbssp_data);
+		return -ENODEV;
+	}
+
+	/* Set the USBSSP state before we enable the irqs */
+	temp = readl(&usbssp_data->op_regs->command);
+	temp |= (CMD_EIE);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"// Enable interrupts, cmd = 0x%x.", temp);
+	writel(temp, &usbssp_data->op_regs->command);
+
+	temp = readl(&usbssp_data->ir_set->irq_pending);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+		"// Enabling event ring interrupter %p by writing 0x%x to irq_pending",
+		usbssp_data->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
+	writel(ER_IRQ_ENABLE(temp), &usbssp_data->ir_set->irq_pending);
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"Finished usbssp_run for USBSSP controller");
+
+	usbssp_data->cmd_ring_state = CMD_RING_STATE_RUNNING;
+
+//	usbssp_debugfs_init(usbssp_data);
+
+	return 0;
+}
+
+/*
+ * Stop USBSSP controller.
+ *
+ * This function is called by the gadget core when the USBSSP driver is removed.
+ * Its opposite is usbssp_run().
+ *
+ * Disable device contexts, disable IRQs, and quiesce the DC.
+ * Reset the DC, finish any completed transactions, and cleanup memory.
+ */
+void usbssp_stop(struct usbssp_udc *usbssp_data)
+{
+	u32 temp;
+
+	spin_lock_irq(&usbssp_data->lock);
+	usbssp_data->usbssp_state |= USBSSP_STATE_HALTED;
+	usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
+	usbssp_halt(usbssp_data);
+	usbssp_reset(usbssp_data);
+	spin_unlock_irq(&usbssp_data->lock);
+	usbssp_cleanup_msix(usbssp_data);
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			 "// Disabling event ring interrupts");
+	temp = readl(&usbssp_data->op_regs->status);
+	writel((temp & ~0x1fff) | STS_EINT, &usbssp_data->op_regs->status);
+	temp = readl(&usbssp_data->ir_set->irq_pending);
+	writel(ER_IRQ_DISABLE(temp), &usbssp_data->ir_set->irq_pending);
+	usbssp_print_ir_set(usbssp_data, 0);
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"cleaning up memory");
+	usbssp_mem_cleanup(usbssp_data);
+//	usbssp_debugfs_exit(usbssp_data);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+			"usbssp_stop completed - status = %x",
+			readl(&usbssp_data->op_regs->status));
+}
+
+#ifdef CONFIG_PM
+/*
+ * Stop DC (not bus-specific)
+ *
+ * This is called when the machine transition into S3/S4 mode.
+ *
+ */
+int usbssp_suspend(struct usbssp_udc *usbssp_data, bool do_wakeup)
+{
+	/*TODO*/
+	return -ENOSYS;
+}
+
+/*
+ * start DC (not bus-specific)
+ *
+ * This is called when the machine transition from S3/S4 mode.
+ *
+ */
+int usbssp_resume(struct usbssp_udc *usbssp_data, bool hibernated)
+{
+	/*TODO*/
+	return -ENOSYS;
+}
+
+#endif	/* CONFIG_PM */
+
+/**
+ * usbssp_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)
+ */
+unsigned int usbssp_get_endpoint_index(
+		const struct usb_endpoint_descriptor *desc)
+{
+	unsigned int index;
+
+	if (usb_endpoint_xfer_control(desc)) {
+		index = (unsigned int) (usb_endpoint_num(desc)*2);
+	} else {
+		index = (unsigned int) (usb_endpoint_num(desc)*2) +
+			(usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
+	}
+	return index;
+}
+
+/* The reverse operation to usbssp_get_endpoint_index.
+ * Calculate the USB endpoint address from the USBSSP endpoint index.
+ */
+unsigned int usbssp_get_endpoint_address(unsigned int ep_index)
+{
+	unsigned int number = DIV_ROUND_UP(ep_index, 2);
+	unsigned int direction = ep_index % 2 ? USB_DIR_OUT : USB_DIR_IN;
+
+	return direction | number;
+}
+
+/* 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.
+ */
+unsigned int usbssp_get_endpoint_flag(
+			const struct usb_endpoint_descriptor *desc)
+{
+	return 1 << (usbssp_get_endpoint_index(desc) + 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.
+ */
+unsigned int usbssp_get_endpoint_flag_from_index(unsigned int ep_index)
+{
+	return 1 << (ep_index + 1);
+}
+
+/* Compute the last valid endpoint context index. Basically, this is the
+ * endpoint index plus one. For slot contexts with more than valid endpoint,
+ * we find the most significant bit set in the added contexts flags.
+ * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
+ * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
+ */
+unsigned int usbssp_last_valid_endpoint(u32 added_ctxs)
+{
+	return fls(added_ctxs) - 1;
+}
+
+/* Returns 1 if the arguments are OK;
+ * returns -EINVAL for NULL pointers.
+ */
+
+static int usbssp_check_args(struct usbssp_udc *usbssp_data,
+			     struct usbssp_ep *ep, int check_ep,
+			     bool check_dev_priv, const char *func)
+{
+	struct usbssp_device	*dev_priv;
+
+	if (!usbssp_data || (check_ep && !ep)) {
+		pr_debug("USBSSP %s called with invalid args\n", func);
+		return -EINVAL;
+	}
+
+	if (check_dev_priv)
+		dev_priv = &usbssp_data->devs;
+
+	if (usbssp_data->usbssp_state & USBSSP_STATE_HALTED)
+		return -ENODEV;
+
+	return 1;
+}
+
+static int usbssp_configure_endpoint(struct usbssp_udc *usbssp_data,
+				     struct usb_gadget *g,
+				     struct usbssp_command *command,
+				     bool ctx_change,
+				     bool must_succeed);
+
+int usbssp_enqueue(struct usbssp_ep *dep, struct usbssp_request *req_priv)
+{
+	int ret = 0;
+	unsigned int ep_index;
+	unsigned int ep_state;
+	const struct usb_endpoint_descriptor *desc;
+	struct usbssp_udc *usbssp_data = dep->usbssp_data;
+	int num_tds;
+
+	if (usbssp_check_args(usbssp_data, dep, true, true, __func__) <= 0)
+		return -EINVAL;
+
+	if (!dep->endpoint.desc) {
+		usbssp_err(usbssp_data, "%s: can't queue to disabled endpoint\n",
+			dep->name);
+		return -ESHUTDOWN;
+	}
+
+	if (WARN(req_priv->dep != dep, "request %p belongs to '%s'\n",
+	    &req_priv->request, req_priv->dep->name)) {
+		usbssp_err(usbssp_data, "%s: reequest %p belongs to '%s'\n",
+			dep->name, &req_priv->request, req_priv->dep->name);
+		return -EINVAL;
+	}
+
+	if (!list_empty(&dep->pending_list) && req_priv->epnum == 0) {
+		usbssp_warn(usbssp_data,
+			"Ep0 has incomplete previous transfer'\n");
+		return -EBUSY;
+	}
+
+	//pm_runtime_get(usbssp_data->dev);
+	req_priv->request.actual = 0;
+	req_priv->request.status = -EINPROGRESS;
+	req_priv->direction = dep->direction;
+	req_priv->epnum = dep->number;
+
+	desc = req_priv->dep->endpoint.desc;
+	ep_index = usbssp_get_endpoint_index(desc);
+	ep_state = usbssp_data->devs.eps[ep_index].ep_state;
+	req_priv->sg = req_priv->request.sg;
+
+	req_priv->num_pending_sgs = req_priv->request.num_mapped_sgs;
+	usbssp_info(usbssp_data, "SG list addr: %p with %d elements.\n",
+			req_priv->sg, req_priv->num_pending_sgs);
+
+	list_add_tail(&req_priv->list, &dep->pending_list);
+
+	if (req_priv->num_pending_sgs > 0)
+		num_tds = req_priv->num_pending_sgs;
+	else
+		num_tds = 1;
+
+	if (req_priv->request.zero && req_priv->request.length &&
+	   (req_priv->request.length & (dep->endpoint.maxpacket == 0))) {
+		num_tds++;
+	}
+
+	ret = usb_gadget_map_request_by_dev(usbssp_data->dev,
+				&req_priv->request,
+				dep->direction);
+
+	if (ret) {
+		usbssp_err(usbssp_data, "Can't map request to DMA\n");
+		goto req_del;
+	}
+
+	/*allocating memory for transfer descriptors*/
+	req_priv->td = kzalloc(num_tds * sizeof(struct usbssp_td), GFP_ATOMIC);
+
+	if (!req_priv->td) {
+		ret = -ENOMEM;
+		goto free_priv;
+	}
+
+	if (ep_state & (EP_GETTING_STREAMS | EP_GETTING_NO_STREAMS)) {
+		usbssp_warn(usbssp_data, "WARN: Can't enqueue USB Request, "
+				"ep in streams transition state %x\n",
+				ep_state);
+		ret = -EINVAL;
+		goto free_priv;
+	}
+
+	req_priv->num_tds = num_tds;
+	req_priv->num_tds_done = 0;
+	trace_usbssp_request_enqueue(&req_priv->request);
+
+	switch (usb_endpoint_type(desc)) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		ret = usbssp_queue_ctrl_tx(usbssp_data, GFP_ATOMIC, req_priv,
+				ep_index);
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		ret = usbssp_queue_bulk_tx(usbssp_data, GFP_ATOMIC, req_priv,
+				ep_index);
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		ret = usbssp_queue_intr_tx(usbssp_data, GFP_ATOMIC, req_priv,
+				ep_index);
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		ret = usbssp_queue_isoc_tx_prepare(usbssp_data, GFP_ATOMIC,
+				req_priv, ep_index);
+	}
+
+	if (ret < 0) {
+free_priv:
+		usb_gadget_unmap_request_by_dev(usbssp_data->dev,
+				&req_priv->request, dep->direction);
+		usbssp_request_free_priv(req_priv);
+
+req_del:
+		list_del(&req_priv->list);
+	}
+	return ret;
+}
+
+/*
+ * Remove the request's TD from the endpoint ring. This may cause the DC to stop
+ * USB transfers, potentially stopping in the middle of a TRB buffer. The DC
+ * 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 DC 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 DC 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
+ *     DC 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.
+ *
+ * This function should protect against the TD enqueueing code ringing the
+ * doorbell while this code is waiting for a Stop Endpoint command to complete.
+ *
+ */
+int usbssp_dequeue(struct usbssp_ep *ep_priv, struct usbssp_request *req_priv)
+{
+	int ret = 0, i;
+	struct usbssp_udc *usbssp_data;
+	unsigned int ep_index;
+	struct usbssp_ring *ep_ring;
+	struct usbssp_device *priv_dev;
+	struct usbssp_ep_ctx *ep_ctx;
+
+	usbssp_data = ep_priv->usbssp_data;
+	trace_usbssp_request_dequeue(&req_priv->request);
+
+	priv_dev = &usbssp_data->devs;
+	ep_index = usbssp_get_endpoint_index(req_priv->dep->endpoint.desc);
+	ep_priv = &usbssp_data->devs.eps[ep_index];
+	ep_ring = usbssp_request_to_transfer_ring(usbssp_data, req_priv);
+
+	if (!ep_ring)
+		goto err_giveback;
+
+	i = req_priv->num_tds_done;
+
+	if (i < req_priv->num_tds)
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+			"Cancel request %p, dev %s, ep 0x%x, "
+			"starting at offset 0x%llx",
+			&req_priv->request, usbssp_data->gadget.name,
+			req_priv->dep->endpoint.desc->bEndpointAddress,
+			(unsigned long long) usbssp_trb_virt_to_dma(
+				req_priv->td[i].start_seg,
+				req_priv->td[i].first_trb));
+
+	/* Queue a stop endpoint command, but only if it is
+	 * in EP_STATE_RUNNING state.
+	 */
+	ep_ctx = usbssp_get_ep_ctx(usbssp_data, priv_dev->out_ctx, ep_index);
+	if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_RUNNING) {
+		ret = usbssp_cmd_stop_ep(usbssp_data, &usbssp_data->gadget,
+				ep_priv);
+		if (ret)
+			return ret;
+	}
+
+	usbssp_remove_request(usbssp_data, req_priv, ep_index);
+	return ret;
+
+err_giveback:
+	usbssp_giveback_request_in_irq(usbssp_data, req_priv->td, -ESHUTDOWN);
+	return ret;
+}
+
+/* Drop an endpoint from a new bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to usbssp_drop_endpoint() followed by a call to usbssp_add_endpoint()
+ * will add the endpoint to the schedule with possibly new parameters
+ * denoted by a different endpoint descriptor in usbssp_ep.
+ * A call to usbssp_add_endpoint() followed by a call to
+ * usbsssp_drop_endpoint() is not allowed.
+ */
+int usbssp_drop_endpoint(struct usbssp_udc *usbssp_data, struct usb_gadget *g,
+		struct usbssp_ep *dep)
+{
+	struct usbssp_container_ctx *in_ctx, *out_ctx;
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	unsigned int ep_index;
+	struct usbssp_ep_ctx *ep_ctx;
+	u32 drop_flag;
+	u32 new_add_flags, new_drop_flags;
+	int ret;
+
+	ret = usbssp_check_args(usbssp_data, dep, 1, true, __func__);
+	if (ret <= 0)
+		return ret;
+
+	if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+		return -ENODEV;
+
+	drop_flag = usbssp_get_endpoint_flag(dep->endpoint.desc);
+	if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
+		usbssp_dbg(usbssp_data, "USBSSP %s - can't drop slot or ep 0 %#x\n",
+				__func__, drop_flag);
+		return 0;
+	}
+
+	in_ctx = usbssp_data->devs.in_ctx;
+	out_ctx = usbssp_data->devs.out_ctx;
+	ctrl_ctx = usbssp_get_input_control_ctx(in_ctx);
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data, "%s: Could not get input context, bad type.\n",
+				__func__);
+		return 0;
+	}
+
+	ep_index = usbssp_get_endpoint_index(dep->endpoint.desc);
+	ep_ctx = usbssp_get_ep_ctx(usbssp_data, out_ctx, ep_index);
+	/* If the controller already knows the endpoint is disabled,
+	 * or the USBSSP driver has noted it is disabled, ignore this request
+	 */
+	if ((GET_EP_CTX_STATE(ep_ctx) == EP_STATE_DISABLED) ||
+	    le32_to_cpu(ctrl_ctx->drop_flags) &
+	    usbssp_get_endpoint_flag(dep->endpoint.desc)) {
+		/* Do not warn when called after a usb_device_reset */
+		if (usbssp_data->devs.eps[ep_index].ring != NULL)
+			usbssp_warn(usbssp_data, "USBSSP %s called with disabled ep %p\n",
+					__func__, dep);
+		return 0;
+	}
+
+	ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
+	new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
+
+	ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag);
+	new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
+
+//	usbssp_debugfs_remove_endpoint(usbssp_data, &usbssp_data->devs,
+//				       ep_index);
+
+	usbssp_endpoint_zero(usbssp_data, &usbssp_data->devs, dep);
+
+	usbssp_dbg(usbssp_data, "drop ep 0x%x, new drop flags = %#x, new add flags = %#x\n",
+			(unsigned int) dep->endpoint.desc->bEndpointAddress,
+			(unsigned int) new_drop_flags,
+			(unsigned int) new_add_flags);
+	return 0;
+}
+
+/* Add an endpoint to a new possible bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to usbssp_drop_endpoint() followed by a call to
+ * usbssp_add_endpoint() will add the endpoint to the schedule with possibly
+ * new parameters denoted by different endpoint descriptor in usbssp_ep.
+ * A call to usbssp_add_endpoint() followed by a call to usbssp_drop_endpoint()
+ * is not allowed.
+ *
+ */
+int usbssp_add_endpoint(struct usbssp_udc *usbssp_data, struct usbssp_ep *dep)
+{
+	const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
+	struct usbssp_container_ctx *in_ctx;
+	unsigned int ep_index;
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	u32 added_ctxs;
+	u32 new_add_flags, new_drop_flags;
+	struct usbssp_device *dev_priv;
+	int ret = 0;
+
+	ret = usbssp_check_args(usbssp_data, dep, 1, true, __func__);
+	if (ret <= 0)
+		return ret;
+
+	if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+		return -ENODEV;
+
+	added_ctxs = usbssp_get_endpoint_flag(desc);
+	if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
+		usbssp_dbg(usbssp_data, "USBSSP %s - can't add slot or ep 0 %#x\n",
+				__func__, added_ctxs);
+		return 0;
+	}
+
+	dev_priv = &usbssp_data->devs;
+	in_ctx = dev_priv->in_ctx;
+	ctrl_ctx = usbssp_get_input_control_ctx(in_ctx);
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data, "%s: Could not get input context, bad type.\n",
+				__func__);
+		return 0;
+	}
+
+	ep_index = usbssp_get_endpoint_index(desc);
+	/* If this endpoint is already in use, and the upper layers are trying
+	 * to add it again without dropping it, reject the addition.
+	 */
+	if (dev_priv->eps[ep_index].ring &&
+	    !(le32_to_cpu(ctrl_ctx->drop_flags) & added_ctxs)) {
+		usbssp_warn(usbssp_data,
+			"Trying to add endpoint 0x%x without dropping it.\n",
+			(unsigned int) desc->bEndpointAddress);
+		return -EINVAL;
+	}
+
+	/* If already noted the endpoint is enabled,
+	 * ignore this request.
+	 */
+	if (le32_to_cpu(ctrl_ctx->add_flags) & added_ctxs) {
+		usbssp_warn(usbssp_data, "USBSSP %s called with enabled ep %p\n",
+				__func__, dep);
+		return 0;
+	}
+
+	if (usbssp_endpoint_init(usbssp_data, dev_priv, dep, GFP_ATOMIC) < 0) {
+		usbssp_dbg(usbssp_data, "%s - could not initialize ep %#x\n",
+				__func__, desc->bEndpointAddress);
+		return -ENOMEM;
+	}
+
+	ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
+	new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
+	new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
+
+//	usbssp_debugfs_create_endpoint(usbssp_data,
+//		&usbssp_data->devs, ep_index);
+	usbssp_dbg(usbssp_data,
+		"add ep 0x%x, new drop flags = %#x, new add flags = %#x\n",
+		(unsigned int) desc->bEndpointAddress,
+		(unsigned int) new_drop_flags,
+		(unsigned int) new_add_flags);
+	return 0;
+}
+
+static void usbssp_zero_in_ctx(struct usbssp_udc *usbssp_data,
+			       struct usbssp_device *dev_priv)
+{
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	struct usbssp_ep_ctx *ep_ctx;
+	struct usbssp_slot_ctx *slot_ctx;
+	int i;
+
+	ctrl_ctx = usbssp_get_input_control_ctx(dev_priv->in_ctx);
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data,
+			"%s: Could not get input context, bad type.\n",
+			__func__);
+		return;
+	}
+
+	/* 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 = usbssp_get_slot_ctx(usbssp_data, dev_priv->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 < 31; ++i) {
+		ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->in_ctx, i);
+		ep_ctx->ep_info = 0;
+		ep_ctx->ep_info2 = 0;
+		ep_ctx->deq = 0;
+		ep_ctx->tx_info = 0;
+	}
+}
+
+static int usbssp_configure_endpoint_result(struct usbssp_udc *usbssp_data,
+					    struct usb_gadget *g,
+					    u32 *cmd_status)
+{
+	int ret;
+
+	switch (*cmd_status) {
+	case COMP_COMMAND_ABORTED:
+	case COMP_COMMAND_RING_STOPPED:
+		usbssp_warn(usbssp_data,
+			"Timeout while waiting for configure endpoint command\n");
+		ret = -ETIME;
+		break;
+	case COMP_RESOURCE_ERROR:
+		dev_warn(&g->dev,
+			"Not enough device controller resources for new device state.\n");
+		ret = -ENOMEM;
+		break;
+	case COMP_TRB_ERROR:
+		/* the gadget driver set up something wrong */
+		dev_warn(&g->dev, "ERROR: Endpoint drop flag = 0, "
+			"add flag = 1, and endpoint is not disabled.\n");
+		ret = -EINVAL;
+		break;
+	case COMP_INCOMPATIBLE_DEVICE_ERROR:
+		dev_warn(&g->dev,
+			"ERROR: Incompatible device for endpoint configure command.\n");
+		ret = -ENODEV;
+		break;
+	case COMP_SUCCESS:
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+			"Successful Endpoint Configure command");
+		ret = 0;
+		break;
+	default:
+		usbssp_err(usbssp_data,
+			"ERROR: unexpected command completion code 0x%x.\n",
+			*cmd_status);
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int usbssp_evaluate_context_result(struct usbssp_udc *usbssp_data,
+		struct usb_gadget *g, u32 *cmd_status)
+{
+	int ret;
+
+	switch (*cmd_status) {
+	case COMP_COMMAND_ABORTED:
+	case COMP_COMMAND_RING_STOPPED:
+		usbssp_warn(usbssp_data,
+			"Timeout while waiting for evaluate context command\n");
+		ret = -ETIME;
+		break;
+	case COMP_PARAMETER_ERROR:
+		dev_warn(&g->dev,
+			"WARN: USBSSP driver setup invalid evaluate context command.\n");
+		ret = -EINVAL;
+		break;
+	case COMP_SLOT_NOT_ENABLED_ERROR:
+		dev_warn(&g->dev,
+			"WARN: slot not enabled for evaluate context command.\n");
+		ret = -EINVAL;
+		break;
+	case COMP_CONTEXT_STATE_ERROR:
+		dev_warn(&g->dev,
+			"WARN: invalid context state for evaluate context command.\n");
+		ret = -EINVAL;
+		break;
+	case COMP_INCOMPATIBLE_DEVICE_ERROR:
+		dev_warn(&g->dev,
+			"ERROR: Incompatible device for evaluate context command.\n");
+		ret = -ENODEV;
+		break;
+	case COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR:
+		/* Max Exit Latency too large error */
+		dev_warn(&g->dev, "WARN: Max Exit Latency too large\n");
+		ret = -EINVAL;
+		break;
+	case COMP_SUCCESS:
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+			"Successful evaluate context command");
+		ret = 0;
+		break;
+	default:
+		usbssp_err(usbssp_data,
+			"ERROR: unexpected command completion code 0x%x.\n",
+			*cmd_status);
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+/* Issue a configure endpoint command or evaluate context command
+ * and wait for it to finish.
+ */
+static int usbssp_configure_endpoint(struct usbssp_udc *usbssp_data,
+				     struct usb_gadget *g,
+				     struct usbssp_command *command,
+				     bool ctx_change, bool must_succeed)
+{
+	int ret;
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	struct usbssp_device *dev_priv;
+	struct usbssp_slot_ctx *slot_ctx;
+
+	if (!command)
+		return -EINVAL;
+
+	if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+		return -ESHUTDOWN;
+
+	dev_priv = &usbssp_data->devs;
+	ctrl_ctx = usbssp_get_input_control_ctx(command->in_ctx);
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data,
+			"%s: Could not get input context, bad type.\n",
+			__func__);
+		return -ENOMEM;
+	}
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, command->in_ctx);
+	trace_usbssp_configure_endpoint(slot_ctx);
+
+	if (!ctx_change) {
+		ret = usbssp_queue_configure_endpoint(usbssp_data, command,
+				command->in_ctx->dma, must_succeed);
+	} else {
+		ret = usbssp_queue_evaluate_context(usbssp_data, command,
+				command->in_ctx->dma, must_succeed);
+	}
+
+	if (ret < 0) {
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+			"FIXME allocate a new ring segment");
+		return -ENOMEM;
+	}
+
+	usbssp_ring_cmd_db(usbssp_data);
+
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	/*Waiting for handling Endpoint Configure command */
+	while (!command->status)
+		udelay(100);
+
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	if (!ctx_change)
+		ret = usbssp_configure_endpoint_result(usbssp_data, g,
+			&command->status);
+	else
+		ret = usbssp_evaluate_context_result(usbssp_data, g,
+			&command->status);
+	return ret;
+}
+
+static void usbssp_check_bw_drop_ep_streams(struct usbssp_udc *usbssp_data,
+	struct usbssp_device *vdev, int i)
+{
+	struct usbssp_ep *ep = &vdev->eps[i];
+
+	if (ep->ep_state & EP_HAS_STREAMS) {
+		usbssp_warn(usbssp_data,
+			"WARN: endpoint 0x%02x has streams on set_interface, freeing streams.\n",
+			 usbssp_get_endpoint_address(i));
+		usbssp_free_stream_info(usbssp_data, ep->stream_info);
+		ep->stream_info = NULL;
+		ep->ep_state &= ~EP_HAS_STREAMS;
+	}
+}
+
+int usbssp_halt_endpoint(struct usbssp_udc *usbssp_data, struct usbssp_ep *dep,
+			 int value)
+{
+	int ret = 1;
+	struct usbssp_device *dev_priv;
+	struct usbssp_command *command;
+	unsigned int ep_index;
+	int interrupt_disabled_locally = 0;
+
+	ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+	if (ret <= 0)
+		return ret;
+
+	if ((usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+	    (usbssp_data->usbssp_state & USBSSP_STATE_REMOVING))
+		return -ENODEV;
+
+	dev_priv = &usbssp_data->devs;
+	ep_index = usbssp_get_endpoint_index(dep->endpoint.desc);
+
+	command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+	if (!command)
+		return -ENOMEM;
+
+	if (value) {
+		dep->ep_state |= EP_HALTED;
+
+		ret = usbssp_cmd_stop_ep(usbssp_data,
+				&usbssp_data->gadget, dep);
+		if (ret < 0) {
+			usbssp_err(usbssp_data,
+					"Command Stop Endpoint failed 1\n");
+			return ret;
+		}
+
+		ret = usbssp_queue_halt_endpoint(usbssp_data, command,
+				ep_index);
+
+		if (ret < 0) {
+			usbssp_err(usbssp_data,
+					"Command Halt Endpoint failed\n");
+			goto command_cleanup;
+		}
+
+		usbssp_ring_cmd_db(usbssp_data);
+		/*wait for ep*/
+		if (irqs_disabled()) {
+			spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+					usbssp_data->irq_thread_flag);
+			interrupt_disabled_locally = 1;
+		} else {
+			spin_unlock(&usbssp_data->irq_thread_lock);
+		}
+
+		/* Wait for last stop endpoint command to finish */
+		wait_for_completion(command->completion);
+
+		if (interrupt_disabled_locally)
+			spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+					usbssp_data->irq_thread_flag);
+		else
+			spin_lock(&usbssp_data->irq_thread_lock);
+
+
+	} else {
+		struct usbssp_td *td;
+
+		/* Issue a reset endpoint command to clear the device side
+		 * halt, followed by a set dequeue command to move the
+		 * dequeue pointer past the TD.
+		 */
+		td = list_first_entry(&dep->ring->td_list, struct usbssp_td,
+				td_list);
+
+		usbssp_cleanup_halted_endpoint(usbssp_data, ep_index,
+				dep->ring->stream_id, td, EP_HARD_RESET);
+
+		goto command_cleanup;
+	}
+
+	ret = command->status;
+
+	switch (ret) {
+	case COMP_COMMAND_ABORTED:
+	case COMP_COMMAND_RING_STOPPED:
+		usbssp_warn(usbssp_data,
+				"Timeout waiting for Halt Endpoint command\n");
+		ret = -ETIME;
+		goto command_cleanup;
+	case COMP_SUCCESS:
+		usbssp_dbg(usbssp_data, "Successful Halt Endpoint command.\n");
+		break;
+	default:
+		if (usbssp_is_vendor_info_code(usbssp_data, ret))
+			break;
+		usbssp_warn(usbssp_data, "Unknown completion code %u for "
+				"Halt Endpoint command.\n", ret);
+		ret = -EINVAL;
+		goto command_cleanup;
+	}
+
+command_cleanup:
+	kfree(command->completion);
+	kfree(command);
+	return ret;
+}
+
+/* Called after one or more calls to usbssp_add_endpoint() or
+ * usbssp_drop_endpoint(). If this call fails, the driver is expected
+ * to call usbssp_reset_bandwidth().
+ *
+ */
+int usbssp_check_bandwidth(struct usbssp_udc *usbssp_data, struct usb_gadget *g)
+{
+	int i;
+	int ret = 0;
+	struct usbssp_device *dev_priv;
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	struct usbssp_slot_ctx *slot_ctx;
+	struct usbssp_command *command;
+
+	ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+	if (ret <= 0)
+		return ret;
+
+	if ((usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+	    (usbssp_data->usbssp_state & USBSSP_STATE_REMOVING))
+		return -ENODEV;
+
+	dev_priv = &usbssp_data->devs;
+
+	command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+	if (!command)
+		return -ENOMEM;
+
+	command->in_ctx = dev_priv->in_ctx;
+
+	ctrl_ctx = usbssp_get_input_control_ctx(command->in_ctx);
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data,
+			"%s: Could not get input context, bad type.\n",
+			__func__);
+		ret = -ENOMEM;
+		goto command_cleanup;
+	}
+	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));
+
+	/* Don't issue the command if there's no endpoints to update.*/
+	if (ctrl_ctx->add_flags == cpu_to_le32(SLOT_FLAG) &&
+	    ctrl_ctx->drop_flags == 0) {
+		ret = 0;
+		goto command_cleanup;
+	}
+
+	/* Fix up Context Entries field. Minimum value is EP0 == BIT(1). */
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->in_ctx);
+	for (i = 31; i >= 1; i--) {
+		__le32 le32 = cpu_to_le32(BIT(i));
+
+		if ((dev_priv->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;
+		}
+	}
+
+	usbssp_dbg(usbssp_data, "New Input Control Context:\n");
+	usbssp_dbg_ctx(usbssp_data, dev_priv->in_ctx,
+			LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
+
+	ret = usbssp_configure_endpoint(usbssp_data, g, command,
+			false, false);
+
+	if (ret)
+		/* Caller should call reset_bandwidth() */
+		goto command_cleanup;
+
+	usbssp_dbg(usbssp_data, "Output CTX after successful config ep cmd:\n");
+	usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx,
+			LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
+
+	/* Free any rings that were dropped, but not changed. */
+	for (i = 1; i < 31; ++i) {
+		if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) &&
+		    !(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1)))) {
+			usbssp_free_endpoint_ring(usbssp_data, dev_priv, i);
+			usbssp_check_bw_drop_ep_streams(usbssp_data,
+					dev_priv, i);
+		}
+	}
+
+	usbssp_zero_in_ctx(usbssp_data, dev_priv);
+	/*
+	 * Install any rings for completely new endpoints or changed endpoints,
+	 * and free any old rings from changed endpoints.
+	 */
+	for (i = 1; i < 31; ++i) {
+		if (!dev_priv->eps[i].new_ring)
+			continue;
+		/* Only free the old ring if it exists.
+		 * It may not if this is the first add of an endpoint.
+		 */
+		if (dev_priv->eps[i].ring)
+			usbssp_free_endpoint_ring(usbssp_data, dev_priv, i);
+
+		usbssp_check_bw_drop_ep_streams(usbssp_data, dev_priv, i);
+		dev_priv->eps[i].ring = dev_priv->eps[i].new_ring;
+		dev_priv->eps[i].new_ring = NULL;
+	}
+command_cleanup:
+	kfree(command->completion);
+	kfree(command);
+	return ret;
+}
+
+void usbssp_reset_bandwidth(struct usbssp_udc *usbssp_data,
+			    struct usb_gadget *g)
+{
+	struct usbssp_device *dev_priv;
+	int i, ret;
+
+	ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+	if (ret <= 0)
+		return;
+
+	dev_priv = &usbssp_data->devs;
+	/* Free any rings allocated for added endpoints */
+	for (i = 0; i < 31; ++i) {
+		if (dev_priv->eps[i].new_ring) {
+			usbssp_debugfs_remove_endpoint(usbssp_data,
+					dev_priv, i);
+			usbssp_ring_free(usbssp_data,
+					dev_priv->eps[i].new_ring);
+			dev_priv->eps[i].new_ring = NULL;
+		}
+	}
+	usbssp_zero_in_ctx(usbssp_data, dev_priv);
+}
+
+void usbssp_cleanup_stalled_ring(struct usbssp_udc *usbssp_data,
+				 unsigned int ep_index,
+				 unsigned int stream_id,
+				 struct usbssp_td *td)
+{
+	struct usbssp_dequeue_state deq_state;
+	struct usbssp_ep *ep_priv;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_reset_ep,
+			"Cleaning up stalled endpoint ring");
+	ep_priv = &usbssp_data->devs.eps[ep_index];
+
+	/* We need to move the HW's dequeue pointer past this TD,
+	 * or it will attempt to resend it on the next doorbell ring.
+	 */
+	usbssp_find_new_dequeue_state(usbssp_data,
+			ep_index, stream_id, td, &deq_state);
+
+	if (!deq_state.new_deq_ptr || !deq_state.new_deq_seg)
+		return;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_reset_ep,
+			"Queueing new dequeue state");
+	usbssp_queue_new_dequeue_state(usbssp_data,
+			ep_index, &deq_state);
+}
+
+/*
+ * 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
+ * usbssp_address_device(), and then re-set up the configuration.
+ *
+ * Wait for the Reset Device command to finish. Remove all structures
+ * associated with the endpoints that were disabled. Clear the input device
+ * structure? Reset the control endpoint 0 max packet size?
+ */
+int usbssp_reset_device(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_device *dev_priv;
+	struct usbssp_command *reset_device_cmd;
+	int last_freed_endpoint = 0;
+	struct usbssp_slot_ctx *slot_ctx;
+	int slot_state;
+	int ret = 0;
+
+	ret = usbssp_check_args(usbssp_data, NULL, 0, false, __func__);
+	if (ret <= 0)
+		return ret;
+
+	dev_priv = &usbssp_data->devs;
+
+	/* If device is not setup, there is no point in resetting it */
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+	slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+	pr_info("usbssp_reset_deviceslot_stated\n");
+	if (slot_state == SLOT_STATE_DISABLED ||
+	    slot_state == SLOT_STATE_ENABLED ||
+	    slot_state == SLOT_STATE_DEFAULT) {
+		usbssp_dbg(usbssp_data,
+			"Slot in DISABLED/ENABLED state - reset not allowed\n");
+		return 0;
+	}
+
+	trace_usbssp_reset_device(slot_ctx);
+
+	usbssp_dbg(usbssp_data, "Resetting device with slot ID %u\n",
+			usbssp_data->slot_id);
+	/* Allocate the command structure that holds the struct completion.
+	 */
+	reset_device_cmd = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+	if (!reset_device_cmd) {
+		usbssp_dbg(usbssp_data,
+			"Couldn't allocate command structure.\n");
+		return -ENOMEM;
+	}
+
+	/* Attempt to submit the Reset Device command to the command ring */
+	ret = usbssp_queue_reset_device(usbssp_data, reset_device_cmd);
+	if (ret) {
+		usbssp_dbg(usbssp_data,
+			"FIXME: allocate a command ring segment\n");
+		goto command_cleanup;
+	}
+	usbssp_ring_cmd_db(usbssp_data);
+
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	/* Wait for the Reset Device command to finish */
+	wait_for_completion(reset_device_cmd->completion);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	/* The Reset Device command can't fail, according to spec,
+	 * unless we tried to reset a slot ID that wasn't enabled,
+	 * or the device wasn't in the addressed or configured state.
+	 */
+	ret = reset_device_cmd->status;
+	switch (ret) {
+	case COMP_COMMAND_ABORTED:
+	case COMP_COMMAND_RING_STOPPED:
+		usbssp_warn(usbssp_data,
+			"Timeout waiting for reset device command\n");
+		ret = -ETIME;
+		goto command_cleanup;
+	case COMP_SLOT_NOT_ENABLED_ERROR: /*completion code for bad slot ID */
+	case COMP_CONTEXT_STATE_ERROR: /* completion code for same thing */
+		usbssp_dbg(usbssp_data,
+			"Can't reset device (slot ID %u) in %s state\n",
+			usbssp_data->slot_id,
+			usbssp_get_slot_state(usbssp_data,
+					dev_priv->out_ctx));
+		usbssp_dbg(usbssp_data, "Not freeing device rings.\n");
+		ret = 0;
+		goto command_cleanup;
+	case COMP_SUCCESS:
+		usbssp_dbg(usbssp_data, "Successful reset device command.\n");
+		break;
+	default:
+		usbssp_warn(usbssp_data, "Unknown completion code %u for "
+			"reset device command.\n", ret);
+		ret = -EINVAL;
+		goto command_cleanup;
+	}
+
+	usbssp_dbg(usbssp_data,
+		"Output context after successful reset device cmd:\n");
+	usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, last_freed_endpoint);
+	ret = 0;
+
+command_cleanup:
+	usbssp_free_command(usbssp_data, reset_device_cmd);
+	return ret;
+}
+
+/*
+ * At this point, the struct usb_device is about to go away, the device has
+ * disconnected, and all traffic has been stopped and the endpoints have been
+ * disabled. Free any DC data structures associated with that device.
+ */
+void usbssp_free_dev(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_device *priv_dev;
+	int i, ret;
+	struct usbssp_slot_ctx *slot_ctx;
+
+	priv_dev = &usbssp_data->devs;
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, priv_dev->out_ctx);
+	trace_usbssp_free_dev(slot_ctx);
+
+	for (i = 0; i < 31; ++i)
+		priv_dev->eps[i].ep_state &= ~EP_STOP_CMD_PENDING;
+
+//	usbssp_debugfs_remove_slot(usbssp_data, usbssp_data->slot_id);
+	ret = usbssp_disable_slot(usbssp_data);
+	if (ret)
+		usbssp_free_priv_device(usbssp_data);
+}
+
+int usbssp_disable_slot(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_command *command;
+	u32 state;
+	int ret = 0;
+
+	command = usbssp_alloc_command(usbssp_data, false, GFP_ATOMIC);
+	if (!command)
+		return -ENOMEM;
+
+	/* Don't disable the slot if the device controller is dead. */
+	state = readl(&usbssp_data->op_regs->status);
+	if (state == 0xffffffff ||
+	    (usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+	    (usbssp_data->usbssp_state & USBSSP_STATE_HALTED)) {
+		kfree(command);
+		return -ENODEV;
+	}
+
+	ret = usbssp_queue_slot_control(usbssp_data, command, TRB_DISABLE_SLOT);
+	if (ret) {
+		kfree(command);
+		return ret;
+	}
+	usbssp_ring_cmd_db(usbssp_data);
+	return ret;
+}
+
+/*
+ * Returns 0 if the DC n out of device slots, the Enable Slot command
+ * timed out, or allocating memory failed. Returns 1 on success.
+ */
+int usbssp_alloc_dev(struct usbssp_udc *usbssp_data)
+{
+	int ret, slot_id;
+	struct usbssp_command *command;
+	struct usbssp_slot_ctx *slot_ctx;
+
+	command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+	if (!command)
+		return -ENOMEM;
+
+	ret = usbssp_queue_slot_control(usbssp_data, command, TRB_ENABLE_SLOT);
+
+	if (ret) {
+		usbssp_free_command(usbssp_data, command);
+		return ret;
+	}
+
+	usbssp_ring_cmd_db(usbssp_data);
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+				usbssp_data->irq_thread_flag);
+	wait_for_completion(command->completion);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	slot_id = usbssp_data->slot_id;
+
+	if (!slot_id || command->status != COMP_SUCCESS) {
+		usbssp_err(usbssp_data,
+			"Error while assigning device slot ID\n");
+		usbssp_free_command(usbssp_data, command);
+		return 0;
+	}
+
+	usbssp_free_command(usbssp_data, command);
+
+	if (!usbssp_alloc_priv_device(usbssp_data, GFP_ATOMIC)) {
+		usbssp_warn(usbssp_data,
+			"Could not allocate usbssp_device data structures\n");
+		goto disable_slot;
+	}
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, usbssp_data->devs.out_ctx);
+	trace_usbssp_alloc_dev(slot_ctx);
+
+//	usbssp_debugfs_create_slot(usbssp_data, slot_id);
+
+	return 1;
+
+disable_slot:
+	ret = usbssp_disable_slot(usbssp_data);
+	if (ret)
+		usbssp_free_priv_device(usbssp_data);
+
+	return 0;
+}
+
+/*
+ * Issue an Address Device command
+ */
+static int usbssp_setup_device(struct usbssp_udc *usbssp_data,
+			       enum usbssp_setup_dev setup)
+{
+	const char *act = setup == SETUP_CONTEXT_ONLY ? "context" : "address";
+	struct usbssp_device *dev_priv;
+	int ret = 0;
+	struct usbssp_slot_ctx *slot_ctx;
+	struct usbssp_input_control_ctx *ctrl_ctx;
+	u64 temp_64;
+	struct usbssp_command *command = NULL;
+	int dev_state = 0;
+	int slot_id = usbssp_data->slot_id;
+
+	if (usbssp_data->usbssp_state) {/* dying, removing or halted */
+		ret = -ESHUTDOWN;
+		goto out;
+	}
+
+	if (!slot_id) {
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+				"Bad Slot ID %d", slot_id);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	dev_priv = &usbssp_data->devs;
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+	trace_usbssp_setup_device_slot(slot_ctx);
+
+	dev_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (setup == SETUP_CONTEXT_ONLY) {
+		if (dev_state == SLOT_STATE_DEFAULT) {
+			usbssp_dbg(usbssp_data,
+				"Slot already in default state\n");
+			goto out;
+		}
+	}
+
+	command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+	if (!command) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	command->in_ctx = dev_priv->in_ctx;
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->in_ctx);
+	ctrl_ctx = usbssp_get_input_control_ctx(dev_priv->in_ctx);
+
+	if (!ctrl_ctx) {
+		usbssp_warn(usbssp_data,
+			"%s: Could not get input context, bad type.\n",
+			__func__);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 * If this is the first Set Address (BSR=0) or driver trays
+	 * transition to Default (BSR=1) since device plug-in or
+	 * priv device reallocation after a resume with an USBSSP power loss,
+	 * then set up the slot context or update device address in slot
+	 * context.
+	 */
+	if (!slot_ctx->dev_info || dev_state == SLOT_STATE_DEFAULT)
+		usbssp_setup_addressable_priv_dev(usbssp_data);
+
+	if (dev_state == SLOT_STATE_DEFAULT)
+		usbssp_copy_ep0_dequeue_into_input_ctx(usbssp_data);
+
+	ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
+	ctrl_ctx->drop_flags = 0;
+
+	usbssp_dbg(usbssp_data, "Slot ID %d Input Context:\n", slot_id);
+	usbssp_dbg_ctx(usbssp_data, dev_priv->in_ctx, 2);
+	trace_usbssp_address_ctx(usbssp_data, dev_priv->in_ctx,
+			le32_to_cpu(slot_ctx->dev_info) >> 27);
+
+	ret = usbssp_queue_address_device(usbssp_data, command,
+			dev_priv->in_ctx->dma, setup);
+
+	if (ret) {
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+				"Prabably command ring segment is full");
+		goto out;
+	}
+
+	usbssp_ring_cmd_db(usbssp_data);
+
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+	wait_for_completion(command->completion);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+			usbssp_data->irq_thread_flag);
+
+	switch (command->status) {
+	case COMP_COMMAND_ABORTED:
+	case COMP_COMMAND_RING_STOPPED:
+		usbssp_warn(usbssp_data,
+			"Timeout while waiting for setup device command\n");
+		ret = -ETIME;
+		break;
+	case COMP_CONTEXT_STATE_ERROR:
+	case COMP_SLOT_NOT_ENABLED_ERROR:
+		usbssp_err(usbssp_data,
+			"Setup ERROR: setup %s command for slot %d.\n",
+			act, slot_id);
+		ret = -EINVAL;
+		break;
+	case COMP_INCOMPATIBLE_DEVICE_ERROR:
+		dev_warn(usbssp_data->dev,
+			"ERROR: Incompatible device for setup %s command\n",
+			act);
+		ret = -ENODEV;
+		break;
+	case COMP_SUCCESS:
+		usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+				"Successful setup %s command", act);
+		break;
+	default:
+		usbssp_err(usbssp_data,
+			"ERROR: unexpected setup %s command completion code 0x%x.\n",
+			 act, command->status);
+		usbssp_dbg(usbssp_data, "Slot ID %d Output Context:\n",
+				slot_id);
+		usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, 2);
+		trace_usbssp_address_ctx(usbssp_data, dev_priv->out_ctx, 1);
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret)
+		goto out;
+
+	temp_64 = usbssp_read_64(usbssp_data, &usbssp_data->op_regs->dcbaa_ptr);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+			"Op regs DCBAA ptr = %#016llx", temp_64);
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+		"Slot ID %d dcbaa entry @%p = %#016llx",
+		slot_id, &usbssp_data->dcbaa->dev_context_ptrs[slot_id],
+		(unsigned long long)
+		le64_to_cpu(usbssp_data->dcbaa->dev_context_ptrs[slot_id]));
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+			"Output Context DMA address = %#08llx",
+			(unsigned long long)dev_priv->out_ctx->dma);
+
+	trace_usbssp_address_ctx(usbssp_data, dev_priv->in_ctx,
+				le32_to_cpu(slot_ctx->dev_info) >> 27);
+	usbssp_dbg(usbssp_data, "Slot ID %d Output Context:\n", slot_id);
+	usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, 2);
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+	trace_usbssp_address_ctx(usbssp_data, dev_priv->out_ctx,
+				le32_to_cpu(slot_ctx->dev_info) >> 27);
+	/* Zero the input context control for later use */
+	ctrl_ctx->add_flags = 0;
+	ctrl_ctx->drop_flags = 0;
+
+	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+			"Internal device address = %d",
+			le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK);
+
+	if (setup == SETUP_CONTEXT_ADDRESS)
+		usbssp_status_stage(usbssp_data);
+out:
+	if (command) {
+		kfree(command->completion);
+		kfree(command);
+	}
+	return ret;
+}
+
+int usbssp_address_device(struct usbssp_udc *usbssp_data)
+{
+	return usbssp_setup_device(usbssp_data, SETUP_CONTEXT_ADDRESS);
+}
+
+int usbssp_enable_device(struct usbssp_udc *usbssp_data)
+{
+	return usbssp_setup_device(usbssp_data, SETUP_CONTEXT_ONLY);
+}
+
+int usbssp_set_usb2_hardware_lpm(struct usbssp_udc *usbssp_data,
+		struct usb_request *req, int enable)
+{
+	__le32 __iomem	*pm_addr;
+	u32		pm_val, field;
+	int		besl;
+
+	struct usb_ext_cap_descriptor *usb_ext = req->buf + USB_DT_BOS_SIZE;
+
+	if (usbssp_data->port_major_revision >= 3 ||
+	   !usbssp_data->hw_lpm_support
+	   /*|| !usbssp_data->gadget->lpm_capable*/)
+		return -EPERM;
+
+	if (usb_ext->bDescriptorType != USB_DT_DEVICE_CAPABILITY ||
+	    usb_ext->bDevCapabilityType != USB_CAP_TYPE_EXT) {
+		return -EPERM;
+	}
+	pm_addr = usbssp_data->usb2_ports + PORTPMSC;
+	pm_val = readl(pm_addr);
+	field = le32_to_cpu(usb_ext->bmAttributes);
+
+	//workaround for LPM - will be removed in feature.
+	field &= ~(USB_BESL_SUPPORT | USB_LPM_SUPPORT);
+	usb_ext->bmAttributes = field;
+
+	usbssp_dbg(usbssp_data, "%s port %d USB2 hardware LPM\n",
+		enable ? "enable" : "disable", usbssp_data->devs.port_num);
+
+	if (enable) {
+		/* if device doesn't have a preferred BESL value use a
+		 * default one . See USBSSP_DEFAULT_BESL definition in gadget.h
+		 */
+		if ((field & USB_BESL_SUPPORT) &&
+		    (field & USB_BESL_BASELINE_VALID))
+			besl = USB_GET_BESL_BASELINE(field);
+		else
+			besl = USBSSP_DEFAULT_BESL;
+
+		pm_val &= ~(PORT_BESL_MASK | PORT_HLE_MASK);
+		pm_val |= PORT_RBESL(besl) | PORT_HLE | 3 /*L1S set to 3*/;
+		pr_err("usbssp_set_usb2_hardware_lpm7 %08x\n", pm_val);
+		writel(pm_val, pm_addr);
+		/* flush write */
+		readl(pm_addr);
+	} else {
+		pm_val &= ~(PORT_HLE | PORT_BESL_MASK | PORT_L1S_MASK);
+		pm_val |= PORT_L1S_HLE0_STALL;
+		writel(pm_val, pm_addr);
+	}
+	return 0;
+}
+
+int usbssp_get_frame(struct usbssp_udc *usbssp_data)
+{
+	return readl(&usbssp_data->run_regs->microframe_index) >> 3;
+}
+
+int usbssp_gen_setup(struct usbssp_udc *usbssp_data)
+{
+	int	retval;
+
+	mutex_init(&usbssp_data->mutex);
+
+	usbssp_data->cap_regs = usbssp_data->regs;
+	usbssp_data->op_regs = usbssp_data->regs +
+		HC_LENGTH(readl(&usbssp_data->cap_regs->hc_capbase));
+
+	usbssp_data->run_regs = usbssp_data->regs +
+		(readl(&usbssp_data->cap_regs->run_regs_off) & RTSOFF_MASK);
+	/* Cache read-only capability registers */
+	usbssp_data->hcs_params1 = readl(&usbssp_data->cap_regs->hcs_params1);
+	usbssp_data->hcs_params2 = readl(&usbssp_data->cap_regs->hcs_params2);
+	usbssp_data->hcs_params3 = readl(&usbssp_data->cap_regs->hcs_params3);
+	usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hc_capbase);
+	usbssp_data->hci_version = HC_VERSION(usbssp_data->hcc_params);
+	usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hcc_params);
+	usbssp_data->hcc_params2 = readl(&usbssp_data->cap_regs->hcc_params2);
+	usbssp_print_registers(usbssp_data);
+
+	/* Make sure the Device Controller is halted. */
+	retval = usbssp_halt(usbssp_data);
+	if (retval)
+		return retval;
+
+	usbssp_dbg(usbssp_data, "Resetting Device Controller\n");
+	/* Reset the internal DC memory state and registers. */
+	retval = usbssp_reset(usbssp_data);
+	if (retval)
+		return retval;
+	usbssp_dbg(usbssp_data, "Reset complete\n");
+
+	/* Set dma_mask and coherent_dma_mask to 64-bits,
+	 * if USBSSP supports 64-bit addressing
+	 */
+	if (HCC_64BIT_ADDR(usbssp_data->hcc_params) &&
+	    !dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(64))) {
+		usbssp_dbg(usbssp_data, "Enabling 64-bit DMA addresses.\n");
+		dma_set_coherent_mask(usbssp_data->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.
+		 */
+		retval = dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(32));
+		if (retval)
+			return retval;
+		usbssp_dbg(usbssp_data, "Enabling 32-bit DMA addresses.\n");
+		dma_set_coherent_mask(usbssp_data->dev, DMA_BIT_MASK(32));
+	}
+
+	usbssp_dbg(usbssp_data, "Calling USBSSP init\n");
+	/* Initialize USBSSP controller data structures. */
+	retval = usbssp_init(usbssp_data);
+	if (retval)
+		return retval;
+	usbssp_dbg(usbssp_data, "Called USBSSPinit\n");
+
+	usbssp_info(usbssp_data, "USBSSP params 0x%08x USBSSP version 0x%x\n",
+		usbssp_data->hcc_params, usbssp_data->hci_version);
+
+	return 0;
+}
+
+/*
+ * gadget-if.c file is part of gadget.c file and implements interface
+ * for gadget driver
+ */
+#include "gadget-if.c"
+
+int usbssp_gadget_init(struct usbssp_udc *usbssp_data)
+{
+	int ret;
+
+	/*
+	 * Check the compiler generated sizes of structures that must be laid
+	 * out in specific ways for hardware access.
+	 */
+	BUILD_BUG_ON(sizeof(struct usbssp_doorbell_array) != 2*32/8);
+	BUILD_BUG_ON(sizeof(struct usbssp_slot_ctx) != 8*32/8);
+	BUILD_BUG_ON(sizeof(struct usbssp_ep_ctx) != 8*32/8);
+	/* usbssp_device has eight fields, and also
+	 * embeds one usbssp_slot_ctx and 31 usbssp_ep_ctx
+	 */
+	BUILD_BUG_ON(sizeof(struct usbssp_stream_ctx) != 4*32/8);
+	BUILD_BUG_ON(sizeof(union usbssp_trb) != 4*32/8);
+	BUILD_BUG_ON(sizeof(struct usbssp_erst_entry) != 4*32/8);
+	BUILD_BUG_ON(sizeof(struct usbssp_cap_regs) != 8*32/8);
+	BUILD_BUG_ON(sizeof(struct usbssp_intr_reg) != 8*32/8);
+	/* usbssp_run_regs has eight fields and embeds 128 usbssp_intr_regs */
+	BUILD_BUG_ON(sizeof(struct usbssp_run_regs) != (8+8*128)*32/8);
+
+	/* fill gadget fields */
+	usbssp_data->gadget.ops = &usbssp_gadget_ops;
+	usbssp_data->gadget.name = "usbssp-gadget";
+	usbssp_data->gadget.max_speed = USB_SPEED_SUPER_PLUS;
+	usbssp_data->gadget.speed = USB_SPEED_UNKNOWN;
+	usbssp_data->gadget.sg_supported = true;
+//	usbssp_data->gadget.lpm_capable = 1;
+
+	usbssp_data->setup_buf = kzalloc(USBSSP_EP0_SETUP_SIZE, GFP_KERNEL);
+	if (!usbssp_data->setup_buf)
+		return -ENOMEM;
+
+//	usbssp_debugfs_create_root();
+
+	/*USBSSP support not aligned buffer but this option
+	 * improve performance of this controller.
+	 */
+	usbssp_data->gadget.quirk_ep_out_aligned_size = true;
+	ret = usbssp_gen_setup(usbssp_data);
+	if (ret < 0) {
+		usbssp_err(usbssp_data,
+				"Generic initialization failed with error code%d\n",
+				ret);
+		goto err3;
+	}
+
+	ret = usbssp_gadget_init_endpoint(usbssp_data);
+	if (ret < 0) {
+		usbssp_err(usbssp_data, "failed to initialize endpoints\n");
+		goto err1;
+	}
+
+	ret = usb_add_gadget_udc(usbssp_data->dev, &usbssp_data->gadget);
+
+	if (ret) {
+		usbssp_err(usbssp_data, "failed to register udc\n");
+		goto err2;
+	}
+
+	return ret;
+err2:
+	usbssp_gadget_free_endpoint(usbssp_data);
+err1:
+	usbssp_halt(usbssp_data);
+	usbssp_reset(usbssp_data);
+	usbssp_mem_cleanup(usbssp_data);
+err3:
+	usbssp_debugfs_remove_root();
+	return ret;
+}
+
+int usbssp_gadget_exit(struct usbssp_udc *usbssp_data)
+{
+	int ret = 0;
+
+	usb_del_gadget_udc(&usbssp_data->gadget);
+	usbssp_gadget_free_endpoint(usbssp_data);
+	usbssp_stop(usbssp_data);
+	usbssp_debugfs_remove_root();
+	return ret;
+}
+
+/**NOP command - for testing purpose*/
+int usbssp_nop_test(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_command *nop_cmd;
+	int ret = 0;
+
+	ret = usbssp_check_args(usbssp_data, NULL, 0, false, __func__);
+	if (ret <= 0)
+		return ret;
+
+	usbssp_dbg(usbssp_data, "Test: NOP command\n");
+
+	/* Allocate the command structure that holds the struct completion.
+	 */
+	nop_cmd = usbssp_alloc_command(usbssp_data, true, GFP_NOIO);
+	if (!nop_cmd) {
+		usbssp_dbg(usbssp_data,
+			"Couldn't allocate command structure.\n");
+		return -ENOMEM;
+	}
+
+	ret = usbssp_queue_nop(usbssp_data, nop_cmd);
+	if (ret)
+		goto command_cleanup;
+
+	usbssp_ring_cmd_db(usbssp_data);
+	spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+		usbssp_data->irq_thread_flag);
+
+	/* Wait for the Reset Device command to finish */
+	wait_for_completion(nop_cmd->completion);
+	spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+		usbssp_data->irq_thread_flag);
+
+	/* The NOP command can't fail*/
+	ret = nop_cmd->status;
+	switch (ret) {
+	case COMP_SUCCESS:
+		usbssp_dbg(usbssp_data, "Successful NOP command.\n");
+		break;
+	default:
+		usbssp_warn(usbssp_data,
+			"Unknown completion code %u for NOP command.\n", ret);
+		ret = -EINVAL;
+		goto command_cleanup;
+	}
+
+	ret = 0;
+
+command_cleanup:
+	usbssp_free_command(usbssp_data, nop_cmd);
+	return ret;
+}
