DWC otg usb: compilation fixes and trivial bugfix in slave mode

[openwrt/openwrt.git] / target / linux / ramips / files / drivers / usb / dwc_otg / dwc_otg_pcd.c

/* ==========================================================================
 * $File: //dwh/usb_iip/dev/software/otg/linux/drivers/dwc_otg_pcd.c $
 * $Revision: 1.5 $
 * $Date: 2008-11-27 09:21:25 $
 * $Change: 1115682 $
 *
 * Synopsys HS OTG Linux Software Driver and documentation (hereinafter,
 * "Software") is an Unsupported proprietary work of Synopsys, Inc. unless
 * otherwise expressly agreed to in writing between Synopsys and you.
 *
 * The Software IS NOT an item of Licensed Software or Licensed Product under
 * any End User Software License Agreement or Agreement for Licensed Product
 * with Synopsys or any supplement thereto. You are permitted to use and
 * redistribute this Software in source and binary forms, with or without
 * modification, provided that redistributions of source code must retain this
 * notice. You may not view, use, disclose, copy or distribute this file or
 * any information contained herein except pursuant to this license grant from
 * Synopsys. If you do not agree with this notice, including the disclaimer
 * below, then you are not authorized to use the Software.
 *
 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * ========================================================================== */
#ifndef DWC_HOST_ONLY

/** @file
 * This file implements the Peripheral Controller Driver.
 *
 * The Peripheral Controller Driver (PCD) is responsible for
 * translating requests from the Function Driver into the appropriate
 * actions on the DWC_otg controller. It isolates the Function Driver
 * from the specifics of the controller by providing an API to the
 * Function Driver.
 *
 * The Peripheral Controller Driver for Linux will implement the
 * Gadget API, so that the existing Gadget drivers can be used.
 * (Gadget Driver is the Linux terminology for a Function Driver.)
 *
 * The Linux Gadget API is defined in the header file
 * <code><linux/usb_gadget.h></code>.  The USB EP operations API is
 * defined in the structure <code>usb_ep_ops</code> and the USB
 * Controller API is defined in the structure
 * <code>usb_gadget_ops</code>.
 *
 * An important function of the PCD is managing interrupts generated
 * by the DWC_otg controller. The implementation of the DWC_otg device
 * mode interrupt service routines is in dwc_otg_pcd_intr.c.
 *
 * @todo Add Device Mode test modes (Test J mode, Test K mode, etc).
 * @todo Does it work when the request size is greater than DEPTSIZ
 * transfer size
 *
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/dma-mapping.h>
#include <linux/version.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
# include <linux/usb/ch9.h>
#else
# include <linux/usb_ch9.h>
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
#include <linux/usb/gadget.h>
#else
#include <linux/usb_gadget.h>
#endif

#include "dwc_otg_driver.h"
#include "dwc_otg_pcd.h"


/**
 * Static PCD pointer for use in usb_gadget_register_driver and
 * usb_gadget_unregister_driver.  Initialized in dwc_otg_pcd_init.
 */
static   dwc_otg_pcd_t *s_pcd = 0;


/* Display the contents of the buffer */
extern void dump_msg(const u8 *buf, unsigned int length);


/**
 * This function completes a request.  It call's the request call back.
 */
void dwc_otg_request_done(dwc_otg_pcd_ep_t *ep, dwc_otg_pcd_request_t *req,
                                  int status)
{
        unsigned stopped = ep->stopped;

        DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, ep);
        list_del_init(&req->queue);

        if (req->req.status == -EINPROGRESS) {
                req->req.status = status;
        } else {
                status = req->req.status;
        }

        /* don't modify queue heads during completion callback */
        ep->stopped = 1;
        SPIN_UNLOCK(&ep->pcd->lock);
        req->req.complete(&ep->ep, &req->req);
        SPIN_LOCK(&ep->pcd->lock);

        if (ep->pcd->request_pending > 0) {
                --ep->pcd->request_pending;
        }

        ep->stopped = stopped;
}

/**
 * This function terminates all the requsts in the EP request queue.
 */
void dwc_otg_request_nuke(dwc_otg_pcd_ep_t *ep)
{
        dwc_otg_pcd_request_t *req;

        ep->stopped = 1;

        /* called with irqs blocked?? */
        while (!list_empty(&ep->queue)) {
                req = list_entry(ep->queue.next, dwc_otg_pcd_request_t,
                                 queue);
                dwc_otg_request_done(ep, req, -ESHUTDOWN);
        }
}

/* USB Endpoint Operations */
/*
 * The following sections briefly describe the behavior of the Gadget
 * API endpoint operations implemented in the DWC_otg driver
 * software. Detailed descriptions of the generic behavior of each of
 * these functions can be found in the Linux header file
 * include/linux/usb_gadget.h.
 *
 * The Gadget API provides wrapper functions for each of the function
 * pointers defined in usb_ep_ops. The Gadget Driver calls the wrapper
 * function, which then calls the underlying PCD function. The
 * following sections are named according to the wrapper
 * functions. Within each section, the corresponding DWC_otg PCD
 * function name is specified.
 *
 */

/**
 * This function assigns periodic Tx FIFO to an periodic EP
 * in shared Tx FIFO mode
 */
static uint32_t assign_perio_tx_fifo(dwc_otg_core_if_t  *core_if)
{
        uint32_t PerTxMsk = 1;
        int i;
        for(i = 0; i < core_if->hwcfg4.b.num_dev_perio_in_ep; ++i)
        {
                if((PerTxMsk & core_if->p_tx_msk) == 0) {
                        core_if->p_tx_msk |= PerTxMsk;
                        return i + 1;
                }
                PerTxMsk <<= 1;
        }
        return 0;
}
/**
 * This function releases periodic Tx FIFO
 * in shared Tx FIFO mode
 */
static void release_perio_tx_fifo(dwc_otg_core_if_t *core_if, uint32_t fifo_num)
{
        core_if->p_tx_msk = (core_if->p_tx_msk & (1 << (fifo_num - 1))) ^ core_if->p_tx_msk;
}
/**
 * This function assigns periodic Tx FIFO to an periodic EP
 * in shared Tx FIFO mode
 */
static uint32_t assign_tx_fifo(dwc_otg_core_if_t *core_if)
{
        uint32_t TxMsk = 1;
        int i;

        for(i = 0; i < core_if->hwcfg4.b.num_in_eps; ++i)
        {
                if((TxMsk & core_if->tx_msk) == 0) {
                        core_if->tx_msk |= TxMsk;
                        return i + 1;
                }
                TxMsk <<= 1;
        }
        return 0;
}
/**
 * This function releases periodic Tx FIFO
 * in shared Tx FIFO mode
 */
static void release_tx_fifo(dwc_otg_core_if_t   *core_if, uint32_t fifo_num)
{
        core_if->tx_msk = (core_if->tx_msk & (1 << (fifo_num - 1))) ^ core_if->tx_msk;
}

/**
 * This function is called by the Gadget Driver for each EP to be
 * configured for the current configuration (SET_CONFIGURATION).
 *
 * This function initializes the dwc_otg_ep_t data structure, and then
 * calls dwc_otg_ep_activate.
 */
static int dwc_otg_pcd_ep_enable(struct usb_ep *usb_ep,
                                 const struct usb_endpoint_descriptor *ep_desc)
{
        dwc_otg_pcd_ep_t *ep = 0;
        dwc_otg_pcd_t *pcd = 0;
        unsigned long flags;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%p)\n", __func__, usb_ep, ep_desc);

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        if (!usb_ep || !ep_desc || ep->desc ||
                        ep_desc->bDescriptorType != USB_DT_ENDPOINT) {
                DWC_WARN("%s, bad ep or descriptor\n", __func__);
                return -EINVAL;
        }
        if (ep == &ep->pcd->ep0) {
                DWC_WARN("%s, bad ep(0)\n", __func__);
                return -EINVAL;
        }

        /* Check FIFO size? */
        if (!ep_desc->wMaxPacketSize) {
                DWC_WARN("%s, bad %s maxpacket\n", __func__, usb_ep->name);
                return -ERANGE;
        }

        pcd = ep->pcd;
        if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) {
                DWC_WARN("%s, bogus device state\n", __func__);
                return -ESHUTDOWN;
        }

        SPIN_LOCK_IRQSAVE(&pcd->lock, flags);

        ep->desc = ep_desc;
        ep->ep.maxpacket = le16_to_cpu (ep_desc->wMaxPacketSize);

        /*
         * Activate the EP
         */
        ep->stopped = 0;

        ep->dwc_ep.is_in = (USB_DIR_IN & ep_desc->bEndpointAddress) != 0;
        ep->dwc_ep.maxpacket = ep->ep.maxpacket;

        ep->dwc_ep.type = ep_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;

        if(ep->dwc_ep.is_in) {
                if(!pcd->otg_dev->core_if->en_multiple_tx_fifo) {
                        ep->dwc_ep.tx_fifo_num = 0;

                        if (ep->dwc_ep.type == USB_ENDPOINT_XFER_ISOC) {
                                /*
                                 * if ISOC EP then assign a Periodic Tx FIFO.
                                 */
                                ep->dwc_ep.tx_fifo_num = assign_perio_tx_fifo(pcd->otg_dev->core_if);
                         }
                } else {
                        /*
                         * if Dedicated FIFOs mode is on then assign a Tx FIFO.
                         */
                        ep->dwc_ep.tx_fifo_num = assign_tx_fifo(pcd->otg_dev->core_if);

                }
        }
        /* Set initial data PID. */
        if (ep->dwc_ep.type == USB_ENDPOINT_XFER_BULK) {
                ep->dwc_ep.data_pid_start = 0;
        }

        DWC_DEBUGPL(DBG_PCD, "Activate %s-%s: type=%d, mps=%d desc=%p\n",
                                        ep->ep.name, (ep->dwc_ep.is_in ?"IN":"OUT"),
                                        ep->dwc_ep.type, ep->dwc_ep.maxpacket, ep->desc);

        if(ep->dwc_ep.type != USB_ENDPOINT_XFER_ISOC) {
                ep->dwc_ep.desc_addr = dwc_otg_ep_alloc_desc_chain(&ep->dwc_ep.dma_desc_addr, MAX_DMA_DESC_CNT);
        }

        dwc_otg_ep_activate(GET_CORE_IF(pcd), &ep->dwc_ep);
        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);

        return 0;
}

/**
 * This function is called when an EP is disabled due to disconnect or
 * change in configuration. Any pending requests will terminate with a
 * status of -ESHUTDOWN.
 *
 * This function modifies the dwc_otg_ep_t data structure for this EP,
 * and then calls dwc_otg_ep_deactivate.
 */
static int dwc_otg_pcd_ep_disable(struct usb_ep *usb_ep)
{
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t *pcd = 0;
        unsigned long flags;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, usb_ep);
        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        if (!usb_ep || !ep->desc) {
                DWC_DEBUGPL(DBG_PCD, "%s, %s not enabled\n", __func__,
                        usb_ep ? ep->ep.name : NULL);
                return -EINVAL;
        }

        SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags);

        dwc_otg_request_nuke(ep);

        dwc_otg_ep_deactivate(GET_CORE_IF(ep->pcd), &ep->dwc_ep);
        ep->desc = 0;
        ep->stopped = 1;

        if(ep->dwc_ep.is_in) {
                dwc_otg_flush_tx_fifo(GET_CORE_IF(ep->pcd), ep->dwc_ep.tx_fifo_num);
                release_perio_tx_fifo(GET_CORE_IF(ep->pcd), ep->dwc_ep.tx_fifo_num);
                release_tx_fifo(GET_CORE_IF(ep->pcd), ep->dwc_ep.tx_fifo_num);
        }

        /* Free DMA Descriptors */
        pcd = ep->pcd;

        SPIN_UNLOCK_IRQRESTORE(&ep->pcd->lock, flags);

        if(ep->dwc_ep.type != USB_ENDPOINT_XFER_ISOC && ep->dwc_ep.desc_addr) {
                dwc_otg_ep_free_desc_chain(ep->dwc_ep.desc_addr, ep->dwc_ep.dma_desc_addr, MAX_DMA_DESC_CNT);
        }

        DWC_DEBUGPL(DBG_PCD, "%s disabled\n", usb_ep->name);
        return 0;
}


/**
 * This function allocates a request object to use with the specified
 * endpoint.
 *
 * @param ep The endpoint to be used with with the request
 * @param gfp_flags the GFP_* flags to use.
 */
static struct usb_request *dwc_otg_pcd_alloc_request(struct usb_ep *ep,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
                                                     int gfp_flags
#else
                                                     gfp_t gfp_flags
#endif
                                                   )
{
        dwc_otg_pcd_request_t *req;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%d)\n", __func__, ep, gfp_flags);
        if (0 == ep) {
                DWC_WARN("%s() %s\n", __func__, "Invalid EP!\n");
                return 0;
        }
        req = kmalloc(sizeof(dwc_otg_pcd_request_t), gfp_flags);
        if (0 == req) {
                DWC_WARN("%s() %s\n", __func__,
                                 "request allocation failed!\n");
                return 0;
        }
        memset(req, 0, sizeof(dwc_otg_pcd_request_t));
        req->req.dma = DMA_ADDR_INVALID;
        INIT_LIST_HEAD(&req->queue);
        return &req->req;
}

/**
 * This function frees a request object.
 *
 * @param ep The endpoint associated with the request
 * @param req The request being freed
 */
static void dwc_otg_pcd_free_request(struct usb_ep *ep,
                                         struct usb_request *req)
{
        dwc_otg_pcd_request_t *request;
        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%p)\n", __func__, ep, req);

        if (0 == ep || 0 == req) {
                DWC_WARN("%s() %s\n", __func__,
                                 "Invalid ep or req argument!\n");
                return;
        }

        request = container_of(req, dwc_otg_pcd_request_t, req);
        kfree(request);
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
/**
 * This function allocates an I/O buffer to be used for a transfer
 * to/from the specified endpoint.
 *
 * @param usb_ep The endpoint to be used with with the request
 * @param bytes The desired number of bytes for the buffer
 * @param dma Pointer to the buffer's DMA address; must be valid
 * @param gfp_flags the GFP_* flags to use.
 * @return address of a new buffer or null is buffer could not be allocated.
 */
static void *dwc_otg_pcd_alloc_buffer(struct usb_ep *usb_ep, unsigned bytes,
                                      dma_addr_t *dma,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
                                      int gfp_flags
#else
                                      gfp_t gfp_flags
#endif
                                    )
{
        void *buf;
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t *pcd = 0;

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        pcd = ep->pcd;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%d,%p,%0x)\n", __func__, usb_ep, bytes,
                                dma, gfp_flags);

        /* Check dword alignment */
        if ((bytes & 0x3UL) != 0) {
                DWC_WARN("%s() Buffer size is not a multiple of"
                                 "DWORD size (%d)",__func__, bytes);
        }

        if (GET_CORE_IF(pcd)->dma_enable) {
                buf = dma_alloc_coherent (NULL, bytes, dma, gfp_flags);
        }
        else {
                buf = kmalloc(bytes, gfp_flags);
        }

        /* Check dword alignment */
        if (((int)buf & 0x3UL) != 0) {
                DWC_WARN("%s() Buffer is not DWORD aligned (%p)",
                                        __func__, buf);
        }

        return buf;
}

/**
 * This function frees an I/O buffer that was allocated by alloc_buffer.
 *
 * @param usb_ep the endpoint associated with the buffer
 * @param buf address of the buffer
 * @param dma The buffer's DMA address
 * @param bytes The number of bytes of the buffer
 */
static void dwc_otg_pcd_free_buffer(struct usb_ep *usb_ep, void *buf,
                                        dma_addr_t dma, unsigned bytes)
{
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t *pcd = 0;

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        pcd = ep->pcd;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%p,%0x,%d)\n", __func__, ep, buf, dma, bytes);

        if (GET_CORE_IF(pcd)->dma_enable) {
                dma_free_coherent (NULL, bytes, buf, dma);
        }
        else {
                kfree(buf);
        }
}
#endif


/**
 * This function is used to submit an I/O Request to an EP.
 *
 *      - When the request completes the request's completion callback
 *        is called to return the request to the driver.
 *      - An EP, except control EPs, may have multiple requests
 *        pending.
 *      - Once submitted the request cannot be examined or modified.
 *      - Each request is turned into one or more packets.
 *      - A BULK EP can queue any amount of data; the transfer is
 *        packetized.
 *      - Zero length Packets are specified with the request 'zero'
 *        flag.
 */
static int dwc_otg_pcd_ep_queue(struct usb_ep *usb_ep,
                                struct usb_request *usb_req,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
                                int gfp_flags
#else
                                gfp_t gfp_flags
#endif
                              )
{
        int prevented = 0;
        dwc_otg_pcd_request_t *req;
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t   *pcd;
        unsigned long flags = 0;
        dwc_otg_core_if_t *_core_if;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%p,%d)\n",
                        __func__, usb_ep, usb_req, gfp_flags);

        req = container_of(usb_req, dwc_otg_pcd_request_t, req);
        if (!usb_req || !usb_req->complete || !usb_req->buf ||
                        !list_empty(&req->queue)) {
                DWC_WARN("%s, bad params\n", __func__);
                return -EINVAL;
        }

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        if (!usb_ep || (!ep->desc && ep->dwc_ep.num != 0)/* || ep->stopped != 0*/) {
                DWC_WARN("%s, bad ep\n", __func__);
                return -EINVAL;
        }

        pcd = ep->pcd;
        if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) {
                DWC_DEBUGPL(DBG_PCDV, "gadget.speed=%d\n", pcd->gadget.speed);
                DWC_WARN("%s, bogus device state\n", __func__);
                return -ESHUTDOWN;
        }


        DWC_DEBUGPL(DBG_PCD, "%s queue req %p, len %d buf %p\n",
                           usb_ep->name, usb_req, usb_req->length, usb_req->buf);

        if (!GET_CORE_IF(pcd)->core_params->opt) {
                if (ep->dwc_ep.num != 0) {
                        DWC_ERROR("%s queue req %p, len %d buf %p\n",
                                          usb_ep->name, usb_req, usb_req->length, usb_req->buf);
                }
        }

        SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags);


        /**************************************************
         New add by kaiker ,for DMA mode bug
        ************************************************/
        //by kaiker ,for RT3052 USB OTG device mode

        _core_if = GET_CORE_IF(pcd);

        if (_core_if->dma_enable)
        {
                 usb_req->dma = virt_to_phys((void *)usb_req->buf);

                if(ep->dwc_ep.is_in)
                {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)) || defined(CONFIG_MIPS)
                        if(usb_req->length)
                                dma_cache_wback_inv((unsigned long)usb_req->buf, usb_req->length + 2);
#endif
                }
        }



#if defined(DEBUG) & defined(VERBOSE)
        dump_msg(usb_req->buf, usb_req->length);
#endif

        usb_req->status = -EINPROGRESS;
        usb_req->actual = 0;

        /*
         * For EP0 IN without premature status, zlp is required?
         */
        if (ep->dwc_ep.num == 0 && ep->dwc_ep.is_in) {
                DWC_DEBUGPL(DBG_PCDV, "%s-OUT ZLP\n", usb_ep->name);
                //_req->zero = 1;
        }

        /* Start the transfer */
        if (list_empty(&ep->queue) && !ep->stopped) {
                /* EP0 Transfer? */
                if (ep->dwc_ep.num == 0) {
                        switch (pcd->ep0state) {
                        case EP0_IN_DATA_PHASE:
                                DWC_DEBUGPL(DBG_PCD,
                                                "%s ep0: EP0_IN_DATA_PHASE\n",
                                                __func__);
                                break;

                        case EP0_OUT_DATA_PHASE:
                                DWC_DEBUGPL(DBG_PCD,
                                                "%s ep0: EP0_OUT_DATA_PHASE\n",
                                                __func__);
                                if (pcd->request_config) {
                                        /* Complete STATUS PHASE */
                                        ep->dwc_ep.is_in = 1;
                                        pcd->ep0state = EP0_IN_STATUS_PHASE;
                                }
                                break;

                        case EP0_IN_STATUS_PHASE:
                                DWC_DEBUGPL(DBG_PCD,
                                                "%s ep0: EP0_IN_STATUS_PHASE\n",
                                                __func__);
                                break;

                        default:
                                DWC_DEBUGPL(DBG_ANY, "ep0: odd state %d\n",
                                                pcd->ep0state);
                                SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);
                                return -EL2HLT;
                        }
                        ep->dwc_ep.dma_addr = usb_req->dma;
                        ep->dwc_ep.start_xfer_buff = usb_req->buf;
                        ep->dwc_ep.xfer_buff = usb_req->buf;
                        ep->dwc_ep.xfer_len = usb_req->length;
                        ep->dwc_ep.xfer_count = 0;
                        ep->dwc_ep.sent_zlp = 0;
                        ep->dwc_ep.total_len = ep->dwc_ep.xfer_len;

                        if(usb_req->zero) {
                                if((ep->dwc_ep.xfer_len % ep->dwc_ep.maxpacket == 0)
                                                && (ep->dwc_ep.xfer_len != 0)) {
                                        ep->dwc_ep.sent_zlp = 1;
                                }

                        }

                        dwc_otg_ep0_start_transfer(GET_CORE_IF(pcd), &ep->dwc_ep);
                }
                else {

                        uint32_t max_transfer = GET_CORE_IF(ep->pcd)->core_params->max_transfer_size;

                        /* Setup and start the Transfer */
                        ep->dwc_ep.dma_addr = usb_req->dma;
                        ep->dwc_ep.start_xfer_buff = usb_req->buf;
                        ep->dwc_ep.xfer_buff = usb_req->buf;
                        ep->dwc_ep.sent_zlp = 0;
                        ep->dwc_ep.total_len = usb_req->length;
                        ep->dwc_ep.xfer_len = 0;
                        ep->dwc_ep.xfer_count = 0;

                        if(max_transfer > MAX_TRANSFER_SIZE) {
                                ep->dwc_ep.maxxfer = max_transfer - (max_transfer % ep->dwc_ep.maxpacket);
                        } else {
                                ep->dwc_ep.maxxfer = max_transfer;
                        }

                        if(usb_req->zero) {
                                if((ep->dwc_ep.total_len % ep->dwc_ep.maxpacket == 0)
                                                && (ep->dwc_ep.total_len != 0)) {
                                        ep->dwc_ep.sent_zlp = 1;
                                }

                        }
                        dwc_otg_ep_start_transfer(GET_CORE_IF(pcd), &ep->dwc_ep);
                }
        }

        if ((req != 0) || prevented) {
                ++pcd->request_pending;
                list_add_tail(&req->queue, &ep->queue);
                if (ep->dwc_ep.is_in && ep->stopped && !(GET_CORE_IF(pcd)->dma_enable)) {
                        /** @todo NGS Create a function for this. */
                        diepmsk_data_t diepmsk = { .d32 = 0};
                        diepmsk.b.intktxfemp = 1;
                        if(&GET_CORE_IF(pcd)->multiproc_int_enable) {
                                dwc_modify_reg32(&GET_CORE_IF(pcd)->dev_if->dev_global_regs->diepeachintmsk[ep->dwc_ep.num],
                                                        0, diepmsk.d32);
                        } else {
                                dwc_modify_reg32(&GET_CORE_IF(pcd)->dev_if->dev_global_regs->diepmsk, 0, diepmsk.d32);
                        }
                }
        }

        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);
        return 0;
}

/**
 * This function cancels an I/O request from an EP.
 */
static int dwc_otg_pcd_ep_dequeue(struct usb_ep *usb_ep,
                                  struct usb_request *usb_req)
{
        dwc_otg_pcd_request_t *req;
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t   *pcd;
        unsigned long flags;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p,%p)\n", __func__, usb_ep, usb_req);

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);
        if (!usb_ep || !usb_req || (!ep->desc && ep->dwc_ep.num != 0)) {
                DWC_WARN("%s, bad argument\n", __func__);
                return -EINVAL;
        }
        pcd = ep->pcd;
        if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) {
                DWC_WARN("%s, bogus device state\n", __func__);
                return -ESHUTDOWN;
        }

        SPIN_LOCK_IRQSAVE(&pcd->lock, flags);
        DWC_DEBUGPL(DBG_PCDV, "%s %s %s %p\n", __func__, usb_ep->name,
                                        ep->dwc_ep.is_in ? "IN" : "OUT",
                                        usb_req);

        /* make sure it's actually queued on this endpoint */
        list_for_each_entry(req, &ep->queue, queue)
        {
                if (&req->req == usb_req) {
                        break;
                }
        }

        if (&req->req != usb_req) {
                SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);
                return -EINVAL;
        }

        if (!list_empty(&req->queue)) {
                dwc_otg_request_done(ep, req, -ECONNRESET);
        }
        else {
                req = 0;
        }

        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);

        return req ? 0 : -EOPNOTSUPP;
}

/**
 * usb_ep_set_halt stalls an endpoint.
 *
 * usb_ep_clear_halt clears an endpoint halt and resets its data
 * toggle.
 *
 * Both of these functions are implemented with the same underlying
 * function. The behavior depends on the value argument.
 *
 * @param[in] usb_ep the Endpoint to halt or clear halt.
 * @param[in] value
 *      - 0 means clear_halt.
 *      - 1 means set_halt,
 *      - 2 means clear stall lock flag.
 *      - 3 means set  stall lock flag.
 */
static int dwc_otg_pcd_ep_set_halt(struct usb_ep *usb_ep, int value)
{
        int retval = 0;
        unsigned long flags;
        dwc_otg_pcd_ep_t *ep = 0;


        DWC_DEBUGPL(DBG_PCD,"HALT %s %d\n", usb_ep->name, value);

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);

        if (!usb_ep || (!ep->desc && ep != &ep->pcd->ep0) ||
                        ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
                DWC_WARN("%s, bad ep\n", __func__);
                return -EINVAL;
        }

        SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags);
        if (!list_empty(&ep->queue)) {
                DWC_WARN("%s() %s XFer In process\n", __func__, usb_ep->name);
                retval = -EAGAIN;
        }
        else if (value == 0) {
                dwc_otg_ep_clear_stall(ep->pcd->otg_dev->core_if,
                                        &ep->dwc_ep);
        }
        else if(value == 1) {
                if (ep->dwc_ep.is_in == 1 && ep->pcd->otg_dev->core_if->dma_desc_enable) {
                        dtxfsts_data_t txstatus;
                        fifosize_data_t txfifosize;

                        txfifosize.d32 = dwc_read_reg32(&ep->pcd->otg_dev->core_if->core_global_regs->dptxfsiz_dieptxf[ep->dwc_ep.tx_fifo_num]);
                        txstatus.d32 = dwc_read_reg32(&ep->pcd->otg_dev->core_if->dev_if->in_ep_regs[ep->dwc_ep.num]->dtxfsts);

                        if(txstatus.b.txfspcavail < txfifosize.b.depth) {
                                DWC_WARN("%s() %s Data In Tx Fifo\n", __func__, usb_ep->name);
                                retval = -EAGAIN;
                        }
                        else {
                                if (ep->dwc_ep.num == 0) {
                                        ep->pcd->ep0state = EP0_STALL;
                                }

                                ep->stopped = 1;
                                dwc_otg_ep_set_stall(ep->pcd->otg_dev->core_if,
                                                        &ep->dwc_ep);
                        }
                }
                else {
                        if (ep->dwc_ep.num == 0) {
                                ep->pcd->ep0state = EP0_STALL;
                        }

                        ep->stopped = 1;
                        dwc_otg_ep_set_stall(ep->pcd->otg_dev->core_if,
                                                &ep->dwc_ep);
                }
        }
        else if (value == 2) {
                ep->dwc_ep.stall_clear_flag = 0;
        }
        else if (value == 3) {
                ep->dwc_ep.stall_clear_flag = 1;
        }

        SPIN_UNLOCK_IRQRESTORE(&ep->pcd->lock, flags);
        return retval;
}

/**
 * This function allocates a DMA Descriptor chain for the Endpoint
 * buffer to be used for a transfer to/from the specified endpoint.
 */
dwc_otg_dma_desc_t* dwc_otg_ep_alloc_desc_chain(uint32_t * dma_desc_addr, uint32_t count)
{

        return dma_alloc_coherent(NULL, count * sizeof(dwc_otg_dma_desc_t), dma_desc_addr, GFP_KERNEL);
}

/**
 * This function frees a DMA Descriptor chain that was allocated by ep_alloc_desc.
 */
void dwc_otg_ep_free_desc_chain(dwc_otg_dma_desc_t* desc_addr, uint32_t dma_desc_addr, uint32_t count)
{
        dma_free_coherent(NULL, count * sizeof(dwc_otg_dma_desc_t), desc_addr, dma_desc_addr);
}

#ifdef DWC_EN_ISOC

/**
 * This function initializes a descriptor chain for Isochronous transfer
 *
 * @param core_if Programming view of DWC_otg controller.
 * @param dwc_ep The EP to start the transfer on.
 *
 */
void dwc_otg_iso_ep_start_ddma_transfer(dwc_otg_core_if_t *core_if, dwc_ep_t *dwc_ep)
{

        dsts_data_t             dsts = { .d32 = 0};
        depctl_data_t           depctl = { .d32 = 0 };
        volatile uint32_t       *addr;
        int                     i, j;

        if(dwc_ep->is_in)
                dwc_ep->desc_cnt = dwc_ep->buf_proc_intrvl / dwc_ep->bInterval;
        else
                dwc_ep->desc_cnt = dwc_ep->buf_proc_intrvl * dwc_ep->pkt_per_frm / dwc_ep->bInterval;


        /** Allocate descriptors for double buffering */
        dwc_ep->iso_desc_addr = dwc_otg_ep_alloc_desc_chain(&dwc_ep->iso_dma_desc_addr,dwc_ep->desc_cnt*2);
        if(dwc_ep->desc_addr) {
                DWC_WARN("%s, can't allocate DMA descriptor chain\n", __func__);
                return;
        }

        dsts.d32 = dwc_read_reg32(&core_if->dev_if->dev_global_regs->dsts);

        /** ISO OUT EP */
        if(dwc_ep->is_in == 0) {
                desc_sts_data_t sts = { .d32 =0 };
                dwc_otg_dma_desc_t* dma_desc = dwc_ep->iso_desc_addr;
                dma_addr_t dma_ad;
                uint32_t data_per_desc;
                dwc_otg_dev_out_ep_regs_t *out_regs =
                        core_if->dev_if->out_ep_regs[dwc_ep->num];
                int     offset;

                addr = &core_if->dev_if->out_ep_regs[dwc_ep->num]->doepctl;
                dma_ad = (dma_addr_t)dwc_read_reg32(&(out_regs->doepdma));

                /** Buffer 0 descriptors setup */
                dma_ad = dwc_ep->dma_addr0;

                sts.b_iso_out.bs = BS_HOST_READY;
                sts.b_iso_out.rxsts = 0;
                sts.b_iso_out.l = 0;
                sts.b_iso_out.sp = 0;
                sts.b_iso_out.ioc = 0;
                sts.b_iso_out.pid = 0;
                sts.b_iso_out.framenum = 0;

                offset = 0;
                for(i = 0; i < dwc_ep->desc_cnt - dwc_ep->pkt_per_frm; i+= dwc_ep->pkt_per_frm)
                {

                        for(j = 0; j < dwc_ep->pkt_per_frm; ++j)
                        {
                                data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                                        dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;

                                data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                                sts.b_iso_out.rxbytes = data_per_desc;
                                writel((uint32_t)dma_ad, &dma_desc->buf);
                                writel(sts.d32, &dma_desc->status);

                                offset += data_per_desc;
                                dma_desc ++;
                                (uint32_t)dma_ad += data_per_desc;
                        }
                }

                for(j = 0; j < dwc_ep->pkt_per_frm - 1; ++j)
                {
                        data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                                dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;
                        data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                        sts.b_iso_out.rxbytes = data_per_desc;
                        writel((uint32_t)dma_ad, &dma_desc->buf);
                        writel(sts.d32, &dma_desc->status);

                        offset += data_per_desc;
                        dma_desc ++;
                        (uint32_t)dma_ad += data_per_desc;
                }

                sts.b_iso_out.ioc = 1;
                data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                        dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;
                data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                sts.b_iso_out.rxbytes = data_per_desc;

                writel((uint32_t)dma_ad, &dma_desc->buf);
                writel(sts.d32, &dma_desc->status);
                dma_desc ++;

                /** Buffer 1 descriptors setup */
                sts.b_iso_out.ioc = 0;
                dma_ad = dwc_ep->dma_addr1;

                offset = 0;
                for(i = 0; i < dwc_ep->desc_cnt - dwc_ep->pkt_per_frm; i+= dwc_ep->pkt_per_frm)
                {
                        for(j = 0; j < dwc_ep->pkt_per_frm; ++j)
                        {
                                data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                                        dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;
                                data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                                sts.b_iso_out.rxbytes = data_per_desc;
                                writel((uint32_t)dma_ad, &dma_desc->buf);
                                writel(sts.d32, &dma_desc->status);

                                offset += data_per_desc;
                                dma_desc ++;
                                (uint32_t)dma_ad += data_per_desc;
                        }
                }
                for(j = 0; j < dwc_ep->pkt_per_frm - 1; ++j)
                {
                        data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                                dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;
                        data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                        sts.b_iso_out.rxbytes = data_per_desc;
                        writel((uint32_t)dma_ad, &dma_desc->buf);
                        writel(sts.d32, &dma_desc->status);

                        offset += data_per_desc;
                        dma_desc ++;
                        (uint32_t)dma_ad += data_per_desc;
                }

                sts.b_iso_out.ioc = 1;
                sts.b_iso_out.l = 1;
                data_per_desc = ((j + 1) * dwc_ep->maxpacket > dwc_ep->data_per_frame) ?
                        dwc_ep->data_per_frame - j * dwc_ep->maxpacket : dwc_ep->maxpacket;
                data_per_desc += (data_per_desc % 4) ? (4 - data_per_desc % 4):0;
                sts.b_iso_out.rxbytes = data_per_desc;

                writel((uint32_t)dma_ad, &dma_desc->buf);
                writel(sts.d32, &dma_desc->status);

                dwc_ep->next_frame = 0;

                /** Write dma_ad into DOEPDMA register */
                dwc_write_reg32(&(out_regs->doepdma),(uint32_t)dwc_ep->iso_dma_desc_addr);

        }
        /** ISO IN EP */
        else {
                desc_sts_data_t sts = { .d32 =0 };
                dwc_otg_dma_desc_t* dma_desc = dwc_ep->iso_desc_addr;
                dma_addr_t dma_ad;
                dwc_otg_dev_in_ep_regs_t *in_regs =
                        core_if->dev_if->in_ep_regs[dwc_ep->num];
                unsigned int               frmnumber;
                fifosize_data_t         txfifosize,rxfifosize;

                txfifosize.d32 = dwc_read_reg32(&core_if->dev_if->in_ep_regs[dwc_ep->num]->dtxfsts);
                rxfifosize.d32 = dwc_read_reg32(&core_if->core_global_regs->grxfsiz);


                addr = &core_if->dev_if->in_ep_regs[dwc_ep->num]->diepctl;

                dma_ad = dwc_ep->dma_addr0;

                dsts.d32 = dwc_read_reg32(&core_if->dev_if->dev_global_regs->dsts);

                sts.b_iso_in.bs = BS_HOST_READY;
                sts.b_iso_in.txsts = 0;
                sts.b_iso_in.sp = (dwc_ep->data_per_frame % dwc_ep->maxpacket)? 1 : 0;
                sts.b_iso_in.ioc = 0;
                sts.b_iso_in.pid = dwc_ep->pkt_per_frm;


                frmnumber = dwc_ep->next_frame;

                sts.b_iso_in.framenum = frmnumber;
                sts.b_iso_in.txbytes = dwc_ep->data_per_frame;
                sts.b_iso_in.l = 0;

                /** Buffer 0 descriptors setup */
                for(i = 0; i < dwc_ep->desc_cnt - 1; i++)
                {
                        writel((uint32_t)dma_ad, &dma_desc->buf);
                        writel(sts.d32, &dma_desc->status);
                        dma_desc ++;

                        (uint32_t)dma_ad += dwc_ep->data_per_frame;
                        sts.b_iso_in.framenum += dwc_ep->bInterval;
                }

                sts.b_iso_in.ioc = 1;
                writel((uint32_t)dma_ad, &dma_desc->buf);
                writel(sts.d32, &dma_desc->status);
                ++dma_desc;

                /** Buffer 1 descriptors setup */
                sts.b_iso_in.ioc = 0;
                dma_ad = dwc_ep->dma_addr1;

                for(i = 0; i < dwc_ep->desc_cnt - dwc_ep->pkt_per_frm; i+= dwc_ep->pkt_per_frm)
                {
                        writel((uint32_t)dma_ad, &dma_desc->buf);
                        writel(sts.d32, &dma_desc->status);
                        dma_desc ++;

                        (uint32_t)dma_ad += dwc_ep->data_per_frame;
                        sts.b_iso_in.framenum += dwc_ep->bInterval;

                        sts.b_iso_in.ioc = 0;
                }
                sts.b_iso_in.ioc = 1;
                sts.b_iso_in.l = 1;

                writel((uint32_t)dma_ad, &dma_desc->buf);
                writel(sts.d32, &dma_desc->status);

                dwc_ep->next_frame = sts.b_iso_in.framenum + dwc_ep->bInterval;

                /** Write dma_ad into diepdma register */
                dwc_write_reg32(&(in_regs->diepdma),(uint32_t)dwc_ep->iso_dma_desc_addr);
        }
        /** Enable endpoint, clear nak  */
        depctl.d32 = 0;
        depctl.b.epena = 1;
        depctl.b.usbactep = 1;
        depctl.b.cnak = 1;

        dwc_modify_reg32(addr, depctl.d32,depctl.d32);
        depctl.d32 = dwc_read_reg32(addr);
}

/**
 * This function initializes a descriptor chain for Isochronous transfer
 *
 * @param core_if Programming view of DWC_otg controller.
 * @param ep The EP to start the transfer on.
 *
 */

void dwc_otg_iso_ep_start_buf_transfer(dwc_otg_core_if_t *core_if, dwc_ep_t *ep)
{
        depctl_data_t           depctl = { .d32 = 0 };
        volatile uint32_t       *addr;


        if(ep->is_in) {
                addr = &core_if->dev_if->in_ep_regs[ep->num]->diepctl;
        } else {
                addr = &core_if->dev_if->out_ep_regs[ep->num]->doepctl;
        }


        if(core_if->dma_enable == 0 || core_if->dma_desc_enable!= 0) {
                return;
        } else {
                deptsiz_data_t          deptsiz = { .d32 = 0 };

                ep->xfer_len = ep->data_per_frame * ep->buf_proc_intrvl / ep->bInterval;
                ep->pkt_cnt = (ep->xfer_len - 1 + ep->maxpacket) /
                                ep->maxpacket;
                ep->xfer_count = 0;
                ep->xfer_buff = (ep->proc_buf_num) ? ep->xfer_buff1 : ep->xfer_buff0;
                ep->dma_addr = (ep->proc_buf_num) ? ep->dma_addr1 : ep->dma_addr0;

                if(ep->is_in) {
                        /* Program the transfer size and packet count
                         *      as follows: xfersize = N * maxpacket +
                         *      short_packet pktcnt = N + (short_packet
                         *      exist ? 1 : 0)
                         */
                        deptsiz.b.mc = ep->pkt_per_frm;
                        deptsiz.b.xfersize = ep->xfer_len;
                        deptsiz.b.pktcnt =
                                (ep->xfer_len - 1 + ep->maxpacket) /
                                ep->maxpacket;
                        dwc_write_reg32(&core_if->dev_if->in_ep_regs[ep->num]->dieptsiz, deptsiz.d32);

                        /* Write the DMA register */
                        dwc_write_reg32 (&(core_if->dev_if->in_ep_regs[ep->num]->diepdma), (uint32_t)ep->dma_addr);

                } else {
                        deptsiz.b.pktcnt =
                                        (ep->xfer_len + (ep->maxpacket - 1)) /
                                        ep->maxpacket;
                        deptsiz.b.xfersize = deptsiz.b.pktcnt * ep->maxpacket;

                        dwc_write_reg32(&core_if->dev_if->out_ep_regs[ep->num]->doeptsiz, deptsiz.d32);

                        /* Write the DMA register */
                        dwc_write_reg32 (&(core_if->dev_if->out_ep_regs[ep->num]->doepdma), (uint32_t)ep->dma_addr);

                }
                /** Enable endpoint, clear nak  */
                depctl.d32 = 0;
                dwc_modify_reg32(addr, depctl.d32,depctl.d32);

                depctl.b.epena = 1;
                depctl.b.cnak = 1;

                dwc_modify_reg32(addr, depctl.d32,depctl.d32);
        }
}


/**
 * This function does the setup for a data transfer for an EP and
 * starts the transfer.  For an IN transfer, the packets will be
 * loaded into the appropriate Tx FIFO in the ISR. For OUT transfers,
 * the packets are unloaded from the Rx FIFO in the ISR.  the ISR.
 *
 * @param core_if Programming view of DWC_otg controller.
 * @param ep The EP to start the transfer on.
 */

void dwc_otg_iso_ep_start_transfer(dwc_otg_core_if_t *core_if, dwc_ep_t *ep)
{
        if(core_if->dma_enable) {
                if(core_if->dma_desc_enable) {
                        if(ep->is_in) {
                                ep->desc_cnt = ep->pkt_cnt / ep->pkt_per_frm;
                        } else {
                                ep->desc_cnt = ep->pkt_cnt;
                        }
                        dwc_otg_iso_ep_start_ddma_transfer(core_if, ep);
                } else {
                        if(core_if->pti_enh_enable) {
                                dwc_otg_iso_ep_start_buf_transfer(core_if, ep);
                        } else {
                                ep->cur_pkt_addr = (ep->proc_buf_num) ? ep->xfer_buff1 : ep->xfer_buff0;
                                ep->cur_pkt_dma_addr = (ep->proc_buf_num) ? ep->dma_addr1 : ep->dma_addr0;
                                dwc_otg_iso_ep_start_frm_transfer(core_if, ep);
                        }
                }
        } else {
                ep->cur_pkt_addr = (ep->proc_buf_num) ? ep->xfer_buff1 : ep->xfer_buff0;
                ep->cur_pkt_dma_addr = (ep->proc_buf_num) ? ep->dma_addr1 : ep->dma_addr0;
                dwc_otg_iso_ep_start_frm_transfer(core_if, ep);
        }
}

/**
 * This function does the setup for a data transfer for an EP and
 * starts the transfer.  For an IN transfer, the packets will be
 * loaded into the appropriate Tx FIFO in the ISR. For OUT transfers,
 * the packets are unloaded from the Rx FIFO in the ISR.  the ISR.
 *
 * @param core_if Programming view of DWC_otg controller.
 * @param ep The EP to start the transfer on.
 */

void dwc_otg_iso_ep_stop_transfer(dwc_otg_core_if_t *core_if, dwc_ep_t *ep)
{
        depctl_data_t depctl = { .d32 = 0 };
        volatile uint32_t *addr;

        if(ep->is_in == 1) {
                addr = &core_if->dev_if->in_ep_regs[ep->num]->diepctl;
        }
        else {
                addr = &core_if->dev_if->out_ep_regs[ep->num]->doepctl;
        }

        /* disable the ep */
        depctl.d32 = dwc_read_reg32(addr);

        depctl.b.epdis = 1;
        depctl.b.snak = 1;

        dwc_write_reg32(addr, depctl.d32);

        if(core_if->dma_desc_enable &&
                ep->iso_desc_addr && ep->iso_dma_desc_addr) {
                dwc_otg_ep_free_desc_chain(ep->iso_desc_addr,ep->iso_dma_desc_addr,ep->desc_cnt * 2);
        }

        /* reset varibales */
        ep->dma_addr0 = 0;
        ep->dma_addr1 = 0;
        ep->xfer_buff0 = 0;
        ep->xfer_buff1 = 0;
        ep->data_per_frame = 0;
        ep->data_pattern_frame = 0;
        ep->sync_frame = 0;
        ep->buf_proc_intrvl = 0;
        ep->bInterval = 0;
        ep->proc_buf_num = 0;
        ep->pkt_per_frm = 0;
        ep->pkt_per_frm = 0;
        ep->desc_cnt =  0;
        ep->iso_desc_addr = 0;
        ep->iso_dma_desc_addr = 0;
}


/**
 * This function is used to submit an ISOC Transfer Request to an EP.
 *
 *      - Every time a sync period completes the request's completion callback
 *        is called to provide data to the gadget driver.
 *      - Once submitted the request cannot be modified.
 *      - Each request is turned into periodic data packets untill ISO
 *        Transfer is stopped..
 */
static int dwc_otg_pcd_iso_ep_start(struct usb_ep *usb_ep, struct usb_iso_request *req,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
                                int gfp_flags
#else
                                gfp_t gfp_flags
#endif
)
{
        dwc_otg_pcd_ep_t        *ep;
        dwc_otg_pcd_t           *pcd;
        dwc_ep_t                *dwc_ep;
        unsigned long           flags = 0;
        int32_t                 frm_data;
        dwc_otg_core_if_t       *core_if;
        dcfg_data_t             dcfg;
        dsts_data_t             dsts;


        if (!req || !req->process_buffer || !req->buf0 || !req->buf1) {
                DWC_WARN("%s, bad params\n", __func__);
                return -EINVAL;
        }

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);

        if (!usb_ep || !ep->desc || ep->dwc_ep.num == 0) {
                DWC_WARN("%s, bad ep\n", __func__);
                return -EINVAL;
        }

        pcd = ep->pcd;
        core_if = GET_CORE_IF(pcd);

        dcfg.d32 = dwc_read_reg32(&core_if->dev_if->dev_global_regs->dcfg);

        if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) {
                DWC_DEBUGPL(DBG_PCDV, "gadget.speed=%d\n", pcd->gadget.speed);
                DWC_WARN("%s, bogus device state\n", __func__);
                return -ESHUTDOWN;
        }

        SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags);

        dwc_ep = &ep->dwc_ep;

        if(ep->iso_req) {
                DWC_WARN("%s, iso request in progress\n", __func__);
        }
        req->status = -EINPROGRESS;

        dwc_ep->dma_addr0 = req->dma0;
        dwc_ep->dma_addr1 = req->dma1;

        dwc_ep->xfer_buff0 = req->buf0;
        dwc_ep->xfer_buff1 = req->buf1;

        ep->iso_req = req;

        dwc_ep->data_per_frame = req->data_per_frame;

        /** @todo - pattern data support is to be implemented in the future */
        dwc_ep->data_pattern_frame = req->data_pattern_frame;
        dwc_ep->sync_frame = req->sync_frame;

        dwc_ep->buf_proc_intrvl = req->buf_proc_intrvl;

        dwc_ep->bInterval = 1 << (ep->desc->bInterval - 1);

        dwc_ep->proc_buf_num = 0;

        dwc_ep->pkt_per_frm = 0;
        frm_data = ep->dwc_ep.data_per_frame;
        while(frm_data > 0) {
                dwc_ep->pkt_per_frm++;
                frm_data -= ep->dwc_ep.maxpacket;
        }

        dsts.d32 = dwc_read_reg32(&core_if->dev_if->dev_global_regs->dsts);

        if(req->flags & USB_REQ_ISO_ASAP) {
                dwc_ep->next_frame = dsts.b.soffn + 1;
                if(dwc_ep->bInterval != 1){
                        dwc_ep->next_frame = dwc_ep->next_frame + (dwc_ep->bInterval - 1 - dwc_ep->next_frame % dwc_ep->bInterval);
                }
        } else {
                dwc_ep->next_frame = req->start_frame;
        }


        if(!core_if->pti_enh_enable) {
                dwc_ep->pkt_cnt = dwc_ep->buf_proc_intrvl * dwc_ep->pkt_per_frm / dwc_ep->bInterval;
        } else {
                dwc_ep->pkt_cnt =
                        (dwc_ep->data_per_frame * (dwc_ep->buf_proc_intrvl / dwc_ep->bInterval)
                        - 1 + dwc_ep->maxpacket) / dwc_ep->maxpacket;
        }

        if(core_if->dma_desc_enable) {
                dwc_ep->desc_cnt =
                        dwc_ep->buf_proc_intrvl * dwc_ep->pkt_per_frm / dwc_ep->bInterval;
        }

        dwc_ep->pkt_info = kmalloc(sizeof(iso_pkt_info_t) * dwc_ep->pkt_cnt, GFP_KERNEL);
        if(!dwc_ep->pkt_info) {
                return -ENOMEM;
        }
        if(core_if->pti_enh_enable) {
                memset(dwc_ep->pkt_info, 0, sizeof(iso_pkt_info_t) * dwc_ep->pkt_cnt);
        }

        dwc_ep->cur_pkt = 0;

        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);

        dwc_otg_iso_ep_start_transfer(core_if, dwc_ep);

        return 0;
}

/**
 * This function stops ISO EP Periodic Data Transfer.
 */
static int dwc_otg_pcd_iso_ep_stop(struct usb_ep *usb_ep, struct usb_iso_request *req)
{
        dwc_otg_pcd_ep_t *ep;
        dwc_otg_pcd_t   *pcd;
        dwc_ep_t *dwc_ep;
        unsigned long flags;

        ep = container_of(usb_ep, dwc_otg_pcd_ep_t, ep);

        if (!usb_ep || !ep->desc || ep->dwc_ep.num == 0) {
                DWC_WARN("%s, bad ep\n", __func__);
                return -EINVAL;
        }

        pcd = ep->pcd;

        if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) {
                DWC_DEBUGPL(DBG_PCDV, "gadget.speed=%d\n", pcd->gadget.speed);
                DWC_WARN("%s, bogus device state\n", __func__);
                return -ESHUTDOWN;
        }

        dwc_ep = &ep->dwc_ep;

        dwc_otg_iso_ep_stop_transfer(GET_CORE_IF(pcd), dwc_ep);

        kfree(dwc_ep->pkt_info);

        SPIN_LOCK_IRQSAVE(&pcd->lock, flags);

        if(ep->iso_req != req) {
                return -EINVAL;
        }

        req->status = -ECONNRESET;

        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);


        ep->iso_req = 0;

        return 0;
}

/**
 * This function is used for perodical data exchnage between PCD and gadget drivers.
 * for Isochronous EPs
 *
 *      - Every time a sync period completes this function is called to
 *        perform data exchange between PCD and gadget
 */
void dwc_otg_iso_buffer_done(dwc_otg_pcd_ep_t *ep, dwc_otg_pcd_iso_request_t *req)
{
        int i;
        struct usb_gadget_iso_packet_descriptor *iso_packet;
        dwc_ep_t *dwc_ep;

        dwc_ep = &ep->dwc_ep;

        if(ep->iso_req->status == -ECONNRESET) {
                DWC_PRINT("Device has already disconnected\n");
                /*Device has been disconnected*/
                return;
        }

        if(dwc_ep->proc_buf_num != 0) {
                iso_packet = ep->iso_req->iso_packet_desc0;
        }

        else {
                iso_packet = ep->iso_req->iso_packet_desc1;
        }

        /* Fill in ISOC packets descriptors & pass to gadget driver*/

        for(i = 0; i < dwc_ep->pkt_cnt; ++i) {
                iso_packet[i].status = dwc_ep->pkt_info[i].status;
                iso_packet[i].offset = dwc_ep->pkt_info[i].offset;
                iso_packet[i].actual_length = dwc_ep->pkt_info[i].length;
                dwc_ep->pkt_info[i].status = 0;
                dwc_ep->pkt_info[i].offset = 0;
                dwc_ep->pkt_info[i].length = 0;
        }

        /* Call callback function to process data buffer */
        ep->iso_req->status = 0;/* success */

        SPIN_UNLOCK(&ep->pcd->lock);
        ep->iso_req->process_buffer(&ep->ep, ep->iso_req);
        SPIN_LOCK(&ep->pcd->lock);
}


static struct usb_iso_request *dwc_otg_pcd_alloc_iso_request(struct usb_ep *ep,int packets,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
                                int gfp_flags
#else
                                gfp_t gfp_flags
#endif
)
{
        struct usb_iso_request  *pReq = NULL;
        uint32_t                req_size;


        req_size = sizeof(struct usb_iso_request);
        req_size += (2 * packets * (sizeof(struct usb_gadget_iso_packet_descriptor)));


        pReq = kmalloc(req_size, gfp_flags);
        if (!pReq) {
                DWC_WARN("%s, can't allocate Iso Request\n", __func__);
                return 0;
        }
        pReq->iso_packet_desc0 = (void*) (pReq +  1);

        pReq->iso_packet_desc1 = pReq->iso_packet_desc0 + packets;

        return pReq;
}

static void dwc_otg_pcd_free_iso_request(struct usb_ep *ep, struct usb_iso_request *req)
{
        kfree(req);
}

static struct usb_isoc_ep_ops dwc_otg_pcd_ep_ops =
{
        .ep_ops =
        {
                .enable         = dwc_otg_pcd_ep_enable,
                .disable        = dwc_otg_pcd_ep_disable,

                .alloc_request  = dwc_otg_pcd_alloc_request,
                .free_request   = dwc_otg_pcd_free_request,

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
                .alloc_buffer   = dwc_otg_pcd_alloc_buffer,
                .free_buffer    = dwc_otg_pcd_free_buffer,
#endif

                .queue          = dwc_otg_pcd_ep_queue,
                .dequeue        = dwc_otg_pcd_ep_dequeue,

                .set_halt       = dwc_otg_pcd_ep_set_halt,
                .fifo_status    = 0,
                .fifo_flush = 0,
        },
        .iso_ep_start           = dwc_otg_pcd_iso_ep_start,
        .iso_ep_stop            = dwc_otg_pcd_iso_ep_stop,
        .alloc_iso_request      = dwc_otg_pcd_alloc_iso_request,
        .free_iso_request       = dwc_otg_pcd_free_iso_request,
};

#else


static struct usb_ep_ops dwc_otg_pcd_ep_ops =
{
        .enable         = dwc_otg_pcd_ep_enable,
        .disable        = dwc_otg_pcd_ep_disable,

        .alloc_request  = dwc_otg_pcd_alloc_request,
        .free_request   = dwc_otg_pcd_free_request,

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
        .alloc_buffer   = dwc_otg_pcd_alloc_buffer,
        .free_buffer    = dwc_otg_pcd_free_buffer,
#endif

        .queue          = dwc_otg_pcd_ep_queue,
        .dequeue        = dwc_otg_pcd_ep_dequeue,

        .set_halt       = dwc_otg_pcd_ep_set_halt,
        .fifo_status    = 0,
        .fifo_flush = 0,


};

#endif /* DWC_EN_ISOC */
/*      Gadget Operations */
/**
 * The following gadget operations will be implemented in the DWC_otg
 * PCD. Functions in the API that are not described below are not
 * implemented.
 *
 * The Gadget API provides wrapper functions for each of the function
 * pointers defined in usb_gadget_ops. The Gadget Driver calls the
 * wrapper function, which then calls the underlying PCD function. The
 * following sections are named according to the wrapper functions
 * (except for ioctl, which doesn't have a wrapper function). Within
 * each section, the corresponding DWC_otg PCD function name is
 * specified.
 *
 */

/**
 *Gets the USB Frame number of the last SOF.
 */
static int dwc_otg_pcd_get_frame(struct usb_gadget *gadget)
{
        dwc_otg_pcd_t *pcd;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, gadget);

        if (gadget == 0) {
                return -ENODEV;
        }
        else {
                pcd = container_of(gadget, dwc_otg_pcd_t, gadget);
                dwc_otg_get_frame_number(GET_CORE_IF(pcd));
        }

        return 0;
}

void dwc_otg_pcd_initiate_srp(dwc_otg_pcd_t *pcd)
{
        uint32_t *addr = (uint32_t *)&(GET_CORE_IF(pcd)->core_global_regs->gotgctl);
        gotgctl_data_t mem;
        gotgctl_data_t val;

        val.d32 = dwc_read_reg32(addr);
        if (val.b.sesreq) {
                DWC_ERROR("Session Request Already active!\n");
                        return;
        }

        DWC_NOTICE("Session Request Initated\n");
        mem.d32 = dwc_read_reg32(addr);
        mem.b.sesreq = 1;
        dwc_write_reg32(addr, mem.d32);

        /* Start the SRP timer */
        dwc_otg_pcd_start_srp_timer(pcd);
        return;
}

void dwc_otg_pcd_remote_wakeup(dwc_otg_pcd_t *pcd, int set)
{
        dctl_data_t dctl = {.d32=0};
        volatile uint32_t *addr = &(GET_CORE_IF(pcd)->dev_if->dev_global_regs->dctl);

        if (dwc_otg_is_device_mode(GET_CORE_IF(pcd))) {
                if (pcd->remote_wakeup_enable) {
                        if (set) {
                                dctl.b.rmtwkupsig = 1;
                                dwc_modify_reg32(addr, 0, dctl.d32);
                                DWC_DEBUGPL(DBG_PCD, "Set Remote Wakeup\n");
                                mdelay(1);
                                dwc_modify_reg32(addr, dctl.d32, 0);
                                DWC_DEBUGPL(DBG_PCD, "Clear Remote Wakeup\n");
                        }
                        else {
                        }
                }
                else {
                        DWC_DEBUGPL(DBG_PCD, "Remote Wakeup is disabled\n");
                }
        }
        return;
}

/**
 * Initiates Session Request Protocol (SRP) to wakeup the host if no
 * session is in progress. If a session is already in progress, but
 * the device is suspended, remote wakeup signaling is started.
 *
 */
static int dwc_otg_pcd_wakeup(struct usb_gadget *gadget)
{
        unsigned long flags;
        dwc_otg_pcd_t *pcd;
        dsts_data_t             dsts;
        gotgctl_data_t  gotgctl;

        DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, gadget);

        if (gadget == 0) {
                return -ENODEV;
        }
        else {
                pcd = container_of(gadget, dwc_otg_pcd_t, gadget);
        }
        SPIN_LOCK_IRQSAVE(&pcd->lock, flags);

        /*
         * This function starts the Protocol if no session is in progress. If
         * a session is already in progress, but the device is suspended,
         * remote wakeup signaling is started.
         */

        /* Check if valid session */
        gotgctl.d32 = dwc_read_reg32(&(GET_CORE_IF(pcd)->core_global_regs->gotgctl));
        if (gotgctl.b.bsesvld) {
                /* Check if suspend state */
                dsts.d32 = dwc_read_reg32(&(GET_CORE_IF(pcd)->dev_if->dev_global_regs->dsts));
                if (dsts.b.suspsts) {
                        dwc_otg_pcd_remote_wakeup(pcd, 1);
                }
        }
        else {
                dwc_otg_pcd_initiate_srp(pcd);
        }

        SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags);
        return 0;
}

static const struct usb_gadget_ops dwc_otg_pcd_ops =
{
        .get_frame       = dwc_otg_pcd_get_frame,
        .wakeup          = dwc_otg_pcd_wakeup,
        // current versions must always be self-powered
};

/**
 * This function updates the otg values in the gadget structure.
 */
void dwc_otg_pcd_update_otg(dwc_otg_pcd_t *pcd, const unsigned reset)
{

        if (!pcd->gadget.is_otg)
                return;

        if (reset) {
                pcd->b_hnp_enable = 0;
                pcd->a_hnp_support = 0;
                pcd->a_alt_hnp_support = 0;
        }

        pcd->gadget.b_hnp_enable = pcd->b_hnp_enable;
        pcd->gadget.a_hnp_support =  pcd->a_hnp_support;
        pcd->gadget.a_alt_hnp_support = pcd->a_alt_hnp_support;
}

/**
 * This function is the top level PCD interrupt handler.
 */
static irqreturn_t dwc_otg_pcd_irq(int irq, void *dev
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
                                   , struct pt_regs *r
#endif
                                 )
{
        dwc_otg_pcd_t *pcd = dev;
        int32_t retval = IRQ_NONE;

        retval = dwc_otg_pcd_handle_intr(pcd);
        return IRQ_RETVAL(retval);
}

/**
 * PCD Callback function for initializing the PCD when switching to
 * device mode.
 *
 * @param p void pointer to the <code>dwc_otg_pcd_t</code>
 */
static int32_t dwc_otg_pcd_start_cb(void *p)
{
        dwc_otg_pcd_t *pcd = (dwc_otg_pcd_t *)p;

        /*
         * Initialized the Core for Device mode.
         */
        if (dwc_otg_is_device_mode(GET_CORE_IF(pcd))) {
                dwc_otg_core_dev_init(GET_CORE_IF(pcd));
        }
        return 1;
}

/**
 * PCD Callback function for stopping the PCD when switching to Host
 * mode.
 *
 * @param p void pointer to the <code>dwc_otg_pcd_t</code>
 */
static int32_t dwc_otg_pcd_stop_cb(void *p)
{
        dwc_otg_pcd_t *pcd = (dwc_otg_pcd_t *)p;
        extern void dwc_otg_pcd_stop(dwc_otg_pcd_t *_pcd);

        dwc_otg_pcd_stop(pcd);
        return 1;
}


/**
 * PCD Callback function for notifying the PCD when resuming from
 * suspend.
 *
 * @param p void pointer to the <code>dwc_otg_pcd_t</code>
 */
static int32_t dwc_otg_pcd_suspend_cb(void *p)
{
        dwc_otg_pcd_t *pcd = (dwc_otg_pcd_t *)p;

        if (pcd->driver && pcd->driver->resume) {
                SPIN_UNLOCK(&pcd->lock);
                pcd->driver->suspend(&pcd->gadget);
                SPIN_LOCK(&pcd->lock);
        }

        return 1;
}


/**
 * PCD Callback function for notifying the PCD when resuming from
 * suspend.
 *
 * @param p void pointer to the <code>dwc_otg_pcd_t</code>
 */
static int32_t dwc_otg_pcd_resume_cb(void *p)
{
        dwc_otg_pcd_t *pcd = (dwc_otg_pcd_t *)p;

        if (pcd->driver && pcd->driver->resume) {
                        SPIN_UNLOCK(&pcd->lock);
                        pcd->driver->resume(&pcd->gadget);
                        SPIN_LOCK(&pcd->lock);
        }

        /* Stop the SRP timeout timer. */
        if ((GET_CORE_IF(pcd)->core_params->phy_type != DWC_PHY_TYPE_PARAM_FS) ||
                (!GET_CORE_IF(pcd)->core_params->i2c_enable)) {
                if (GET_CORE_IF(pcd)->srp_timer_started) {
                        GET_CORE_IF(pcd)->srp_timer_started = 0;
                        del_timer(&pcd->srp_timer);
                }
        }
        return 1;
}


/**
 * PCD Callback structure for handling mode switching.
 */
static dwc_otg_cil_callbacks_t pcd_callbacks =
{
        .start = dwc_otg_pcd_start_cb,
        .stop = dwc_otg_pcd_stop_cb,
        .suspend = dwc_otg_pcd_suspend_cb,
        .resume_wakeup = dwc_otg_pcd_resume_cb,
        .p = 0, /* Set at registration */
};

/**
 * This function is called when the SRP timer expires.  The SRP should
 * complete within 6 seconds.
 */
static void srp_timeout(unsigned long ptr)
{
        gotgctl_data_t gotgctl;
        dwc_otg_core_if_t *core_if = (dwc_otg_core_if_t *)ptr;
        volatile uint32_t *addr = &core_if->core_global_regs->gotgctl;

        gotgctl.d32 = dwc_read_reg32(addr);

        core_if->srp_timer_started = 0;

        if ((core_if->core_params->phy_type == DWC_PHY_TYPE_PARAM_FS) &&
                (core_if->core_params->i2c_enable)) {
                DWC_PRINT("SRP Timeout\n");

                if ((core_if->srp_success) &&
                        (gotgctl.b.bsesvld)) {
                        if (core_if->pcd_cb && core_if->pcd_cb->resume_wakeup) {
                                core_if->pcd_cb->resume_wakeup(core_if->pcd_cb->p);
                        }

                        /* Clear Session Request */
                        gotgctl.d32 = 0;
                        gotgctl.b.sesreq = 1;
                        dwc_modify_reg32(&core_if->core_global_regs->gotgctl,
                                          gotgctl.d32, 0);

                        core_if->srp_success = 0;
                }
                else {
                        DWC_ERROR("Device not connected/responding\n");
                        gotgctl.b.sesreq = 0;
                        dwc_write_reg32(addr, gotgctl.d32);
                }
        }
        else if (gotgctl.b.sesreq) {
                DWC_PRINT("SRP Timeout\n");

                DWC_ERROR("Device not connected/responding\n");
                gotgctl.b.sesreq = 0;
                dwc_write_reg32(addr, gotgctl.d32);
        }
        else {
                DWC_PRINT(" SRP GOTGCTL=%0x\n", gotgctl.d32);
        }
}

/**
 * Start the SRP timer to detect when the SRP does not complete within
 * 6 seconds.
 *
 * @param pcd the pcd structure.
 */
void dwc_otg_pcd_start_srp_timer(dwc_otg_pcd_t *pcd)
{
        struct timer_list *srp_timer = &pcd->srp_timer;
        GET_CORE_IF(pcd)->srp_timer_started = 1;
        init_timer(srp_timer);
        srp_timer->function = srp_timeout;
        srp_timer->data = (unsigned long)GET_CORE_IF(pcd);
        srp_timer->expires = jiffies + (HZ*6);
        add_timer(srp_timer);
}

/**
 * Tasklet
 *
 */
extern void start_next_request(dwc_otg_pcd_ep_t *ep);

static void start_xfer_tasklet_func (unsigned long data)
{
        dwc_otg_pcd_t *pcd = (dwc_otg_pcd_t*)data;
        dwc_otg_core_if_t *core_if = pcd->otg_dev->core_if;

        int i;
        depctl_data_t diepctl;

        DWC_DEBUGPL(DBG_PCDV, "Start xfer tasklet\n");

        diepctl.d32 = dwc_read_reg32(&core_if->dev_if->in_ep_regs[0]->diepctl);

        if (pcd->ep0.queue_sof) {
                pcd->ep0.queue_sof = 0;
                start_next_request (&pcd->ep0);
                // break;
        }

        for (i=0; i<core_if->dev_if->num_in_eps; i++)
        {
                depctl_data_t diepctl;
                diepctl.d32 = dwc_read_reg32(&core_if->dev_if->in_ep_regs[i]->diepctl);

                if (pcd->in_ep[i].queue_sof) {
                        pcd->in_ep[i].queue_sof = 0;
                        start_next_request (&pcd->in_ep[i]);
                        // break;
                }
        }

        return;
}







static struct tasklet_struct start_xfer_tasklet = {
        .next = NULL,
        .state = 0,
        .count = ATOMIC_INIT(0),
        .func = start_xfer_tasklet_func,
        .data = 0,
};
/**
 * This function initialized the pcd Dp structures to there default
 * state.
 *
 * @param pcd the pcd structure.
 */
void dwc_otg_pcd_reinit(dwc_otg_pcd_t *pcd)
{
        static const char * names[] =
                {

                        "ep0",
                        "ep1in",
                        "ep2in",
                        "ep3in",
                        "ep4in",
                        "ep5in",
                        "ep6in",
                        "ep7in",
                        "ep8in",
                        "ep9in",
                        "ep10in",
                        "ep11in",
                        "ep12in",
                        "ep13in",
                        "ep14in",
                        "ep15in",
                        "ep1out",
                        "ep2out",
                        "ep3out",
                        "ep4out",
                        "ep5out",
                        "ep6out",
                        "ep7out",
                        "ep8out",
                        "ep9out",
                        "ep10out",
                        "ep11out",
                        "ep12out",
                        "ep13out",
                        "ep14out",
                        "ep15out"

        };

        int i;
        int in_ep_cntr, out_ep_cntr;
        uint32_t hwcfg1;
        uint32_t num_in_eps = (GET_CORE_IF(pcd))->dev_if->num_in_eps;
        uint32_t num_out_eps = (GET_CORE_IF(pcd))->dev_if->num_out_eps;
        dwc_otg_pcd_ep_t *ep;

        DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, pcd);

        INIT_LIST_HEAD (&pcd->gadget.ep_list);
        pcd->gadget.ep0 = &pcd->ep0.ep;
        pcd->gadget.speed = USB_SPEED_UNKNOWN;

        INIT_LIST_HEAD (&pcd->gadget.ep0->ep_list);

        /**
         * Initialize the EP0 structure.
         */
        ep = &pcd->ep0;

        /* Init EP structure */
        ep->desc = 0;
        ep->pcd = pcd;
        ep->stopped = 1;

        /* Init DWC ep structure */
        ep->dwc_ep.num = 0;
        ep->dwc_ep.active = 0;
        ep->dwc_ep.tx_fifo_num = 0;
        /* Control until ep is actvated */
        ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL;
        ep->dwc_ep.maxpacket = MAX_PACKET_SIZE;
        ep->dwc_ep.dma_addr = 0;
        ep->dwc_ep.start_xfer_buff = 0;
        ep->dwc_ep.xfer_buff = 0;
        ep->dwc_ep.xfer_len = 0;
        ep->dwc_ep.xfer_count = 0;
        ep->dwc_ep.sent_zlp = 0;
        ep->dwc_ep.total_len = 0;
        ep->queue_sof = 0;
        ep->dwc_ep.desc_addr = 0;
        ep->dwc_ep.dma_desc_addr = 0;


        /* Init the usb_ep structure. */
        ep->ep.name = names[0];
        ep->ep.ops = (struct usb_ep_ops*)&dwc_otg_pcd_ep_ops;

        /**
         * @todo NGS: What should the max packet size be set to
         * here?  Before EP type is set?
         */
        ep->ep.maxpacket = MAX_PACKET_SIZE;

        list_add_tail (&ep->ep.ep_list, &pcd->gadget.ep_list);

        INIT_LIST_HEAD (&ep->queue);
        /**
         * Initialize the EP structures.
         */
        in_ep_cntr = 0;
        hwcfg1 = (GET_CORE_IF(pcd))->hwcfg1.d32 >> 3;

        for (i = 1; in_ep_cntr < num_in_eps; i++)
        {
                if((hwcfg1 & 0x1) == 0) {
                        dwc_otg_pcd_ep_t *ep = &pcd->in_ep[in_ep_cntr];
                        in_ep_cntr ++;

                        /* Init EP structure */
                        ep->desc = 0;
                        ep->pcd = pcd;
                        ep->stopped = 1;

                        /* Init DWC ep structure */
                        ep->dwc_ep.is_in = 1;
                        ep->dwc_ep.num = i;
                        ep->dwc_ep.active = 0;
                        ep->dwc_ep.tx_fifo_num = 0;

                        /* Control until ep is actvated */
                        ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL;
                        ep->dwc_ep.maxpacket = MAX_PACKET_SIZE;
                        ep->dwc_ep.dma_addr = 0;
                        ep->dwc_ep.start_xfer_buff = 0;
                        ep->dwc_ep.xfer_buff = 0;
                        ep->dwc_ep.xfer_len = 0;
                        ep->dwc_ep.xfer_count = 0;
                        ep->dwc_ep.sent_zlp = 0;
                        ep->dwc_ep.total_len = 0;
                        ep->queue_sof = 0;
                        ep->dwc_ep.desc_addr = 0;
                        ep->dwc_ep.dma_desc_addr = 0;

                        /* Init the usb_ep structure. */
                        ep->ep.name = names[i];
                        ep->ep.ops = (struct usb_ep_ops*)&dwc_otg_pcd_ep_ops;

                        /**
                         * @todo NGS: What should the max packet size be set to
                         * here?  Before EP type is set?
                         */
                        ep->ep.maxpacket = MAX_PACKET_SIZE;

                        list_add_tail (&ep->ep.ep_list, &pcd->gadget.ep_list);

                        INIT_LIST_HEAD (&ep->queue);
                }
                hwcfg1 >>= 2;
        }

        out_ep_cntr = 0;
        hwcfg1 = (GET_CORE_IF(pcd))->hwcfg1.d32 >> 2;

        for (i = 1; out_ep_cntr < num_out_eps; i++)
        {
                if((hwcfg1 & 0x1) == 0) {
                        dwc_otg_pcd_ep_t *ep = &pcd->out_ep[out_ep_cntr];
                        out_ep_cntr++;

                        /* Init EP structure */
                        ep->desc = 0;
                        ep->pcd = pcd;
                        ep->stopped = 1;

                        /* Init DWC ep structure */
                        ep->dwc_ep.is_in = 0;
                        ep->dwc_ep.num = i;
                        ep->dwc_ep.active = 0;
                        ep->dwc_ep.tx_fifo_num = 0;
                        /* Control until ep is actvated */
                        ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL;
                        ep->dwc_ep.maxpacket = MAX_PACKET_SIZE;
                        ep->dwc_ep.dma_addr = 0;
                        ep->dwc_ep.start_xfer_buff = 0;
                        ep->dwc_ep.xfer_buff = 0;
                        ep->dwc_ep.xfer_len = 0;
                        ep->dwc_ep.xfer_count = 0;
                        ep->dwc_ep.sent_zlp = 0;
                        ep->dwc_ep.total_len = 0;
                        ep->queue_sof = 0;

                        /* Init the usb_ep structure. */
                        ep->ep.name = names[15 + i];
                        ep->ep.ops = (struct usb_ep_ops*)&dwc_otg_pcd_ep_ops;
                        /**
                         * @todo NGS: What should the max packet size be set to
                         * here?  Before EP type is set?
                         */
                        ep->ep.maxpacket = MAX_PACKET_SIZE;

                        list_add_tail (&ep->ep.ep_list, &pcd->gadget.ep_list);

                        INIT_LIST_HEAD (&ep->queue);
                }
                hwcfg1 >>= 2;
        }

        /* remove ep0 from the list.  There is a ep0 pointer.*/
        list_del_init (&pcd->ep0.ep.ep_list);

        pcd->ep0state = EP0_DISCONNECT;
        pcd->ep0.ep.maxpacket = MAX_EP0_SIZE;
        pcd->ep0.dwc_ep.maxpacket = MAX_EP0_SIZE;
        pcd->ep0.dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL;
}

/**
 * This function releases the Gadget device.
 * required by device_unregister().
 *
 * @todo Should this do something?      Should it free the PCD?
 */
static void dwc_otg_pcd_gadget_release(struct device *dev)
{
        DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, dev);
}



/**
 * This function initialized the PCD portion of the driver.
 *
 */

int dwc_otg_pcd_init(struct device *dev)
{
        static char pcd_name[] = "dwc_otg_pcd";
        dwc_otg_pcd_t *pcd;
        dwc_otg_core_if_t* core_if;
        dwc_otg_dev_if_t* dev_if;
        dwc_otg_device_t *otg_dev = dev_get_drvdata(dev);
        int retval = 0;


        DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n",__func__, dev);
        /*
         * Allocate PCD structure
         */
        pcd = kmalloc(sizeof(dwc_otg_pcd_t), GFP_KERNEL);

        if (pcd == 0) {
                return -ENOMEM;
        }

        memset(pcd, 0, sizeof(dwc_otg_pcd_t));
        spin_lock_init(&pcd->lock);

        otg_dev->pcd = pcd;
        s_pcd = pcd;
        pcd->gadget.name = pcd_name;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
        strcpy(pcd->gadget.dev.bus_id, "gadget");
#else
        dev_set_name(&pcd->gadget.dev, "%s", "gadget");
#endif

        pcd->otg_dev = dev_get_drvdata(dev);

        pcd->gadget.dev.parent = dev;
        pcd->gadget.dev.release = dwc_otg_pcd_gadget_release;
        pcd->gadget.ops = &dwc_otg_pcd_ops;

        core_if = GET_CORE_IF(pcd);
        dev_if = core_if->dev_if;

        if(core_if->hwcfg4.b.ded_fifo_en) {
                DWC_PRINT("Dedicated Tx FIFOs mode\n");
        }
        else {
                DWC_PRINT("Shared Tx FIFO mode\n");
        }

        /* If the module is set to FS or if the PHY_TYPE is FS then the gadget
         * should not report as dual-speed capable.      replace the following line
         * with the block of code below it once the software is debugged for
         * this.  If is_dualspeed = 0 then the gadget driver should not report
         * a device qualifier descriptor when queried. */
        if ((GET_CORE_IF(pcd)->core_params->speed == DWC_SPEED_PARAM_FULL) ||
                ((GET_CORE_IF(pcd)->hwcfg2.b.hs_phy_type == 2) &&
                 (GET_CORE_IF(pcd)->hwcfg2.b.fs_phy_type == 1) &&
                 (GET_CORE_IF(pcd)->core_params->ulpi_fs_ls))) {
                pcd->gadget.is_dualspeed = 0;
        }
        else {
                pcd->gadget.is_dualspeed = 1;
        }

        if ((otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE) ||
        (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST) ||
        (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) ||
        (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_SRP_CAPABLE_HOST)) {
                pcd->gadget.is_otg = 0;
        }
        else {
                pcd->gadget.is_otg = 1;
        }


        pcd->driver = 0;
        /* Register the gadget device */
        retval = device_register(&pcd->gadget.dev);
        if (retval != 0) {
                kfree (pcd);
                return retval;
        }


        /*
         * Initialized the Core for Device mode.
         */
        if (dwc_otg_is_device_mode(core_if)) {
                dwc_otg_core_dev_init(core_if);
        }

        /*
         * Initialize EP structures
         */
        dwc_otg_pcd_reinit(pcd);

        /*
         * Register the PCD Callbacks.
         */
        dwc_otg_cil_register_pcd_callbacks(otg_dev->core_if, &pcd_callbacks,
                                                pcd);
        /*
         * Setup interupt handler
         */
        DWC_DEBUGPL(DBG_ANY, "registering handler for irq%d\n", otg_dev->irq);
        retval = request_irq(otg_dev->irq, dwc_otg_pcd_irq,
                                IRQF_SHARED, pcd->gadget.name, pcd);
        if (retval != 0) {
                DWC_ERROR("request of irq%d failed\n", otg_dev->irq);
                device_unregister(&pcd->gadget.dev);
                kfree (pcd);
                return -EBUSY;
        }

        /*
         * Initialize the DMA buffer for SETUP packets
         */
        if (GET_CORE_IF(pcd)->dma_enable) {
                pcd->setup_pkt = dma_alloc_coherent (NULL, sizeof (*pcd->setup_pkt) * 5, &pcd->setup_pkt_dma_handle, 0);
                if (pcd->setup_pkt == 0) {
                        free_irq(otg_dev->irq, pcd);
                        device_unregister(&pcd->gadget.dev);
                        kfree (pcd);
                        return -ENOMEM;
                }

                pcd->status_buf = dma_alloc_coherent (NULL, sizeof (uint16_t), &pcd->status_buf_dma_handle, 0);
                if (pcd->status_buf == 0) {
                        dma_free_coherent(NULL, sizeof(*pcd->setup_pkt), pcd->setup_pkt, pcd->setup_pkt_dma_handle);
                        free_irq(otg_dev->irq, pcd);
                        device_unregister(&pcd->gadget.dev);
                        kfree (pcd);
                        return -ENOMEM;
                }

                if (GET_CORE_IF(pcd)->dma_desc_enable) {
                        dev_if->setup_desc_addr[0] = dwc_otg_ep_alloc_desc_chain(&dev_if->dma_setup_desc_addr[0], 1);
                        dev_if->setup_desc_addr[1] = dwc_otg_ep_alloc_desc_chain(&dev_if->dma_setup_desc_addr[1], 1);
                        dev_if->in_desc_addr = dwc_otg_ep_alloc_desc_chain(&dev_if->dma_in_desc_addr, 1);
                        dev_if->out_desc_addr = dwc_otg_ep_alloc_desc_chain(&dev_if->dma_out_desc_addr, 1);

                        if(dev_if->setup_desc_addr[0] == 0
                        || dev_if->setup_desc_addr[1] == 0
                        || dev_if->in_desc_addr == 0
                        || dev_if->out_desc_addr == 0 ) {

                                if(dev_if->out_desc_addr)
                                        dwc_otg_ep_free_desc_chain(dev_if->out_desc_addr, dev_if->dma_out_desc_addr, 1);
                                if(dev_if->in_desc_addr)
                                        dwc_otg_ep_free_desc_chain(dev_if->in_desc_addr, dev_if->dma_in_desc_addr, 1);
                                if(dev_if->setup_desc_addr[1])
                                        dwc_otg_ep_free_desc_chain(dev_if->setup_desc_addr[1], dev_if->dma_setup_desc_addr[1], 1);
                                if(dev_if->setup_desc_addr[0])
                                        dwc_otg_ep_free_desc_chain(dev_if->setup_desc_addr[0], dev_if->dma_setup_desc_addr[0], 1);


                                dma_free_coherent(NULL, sizeof(*pcd->status_buf), pcd->status_buf, pcd->setup_pkt_dma_handle);
                                dma_free_coherent(NULL, sizeof(*pcd->setup_pkt), pcd->setup_pkt, pcd->setup_pkt_dma_handle);

                                free_irq(otg_dev->irq, pcd);
                                device_unregister(&pcd->gadget.dev);
                                kfree (pcd);

                                return -ENOMEM;
                        }
                }
        }
        else {
                pcd->setup_pkt = kmalloc (sizeof (*pcd->setup_pkt) * 5, GFP_KERNEL);
                if (pcd->setup_pkt == 0) {
                        free_irq(otg_dev->irq, pcd);
                        device_unregister(&pcd->gadget.dev);
                        kfree (pcd);
                        return -ENOMEM;
                }

                pcd->status_buf = kmalloc (sizeof (uint16_t), GFP_KERNEL);
                if (pcd->status_buf == 0) {
                        kfree(pcd->setup_pkt);
                        free_irq(otg_dev->irq, pcd);
                        device_unregister(&pcd->gadget.dev);
                        kfree (pcd);
                        return -ENOMEM;
                }
        }


        /* Initialize tasklet */
        start_xfer_tasklet.data = (unsigned long)pcd;
        pcd->start_xfer_tasklet = &start_xfer_tasklet;

        return 0;
}

/**
 * Cleanup the PCD.
 */
void dwc_otg_pcd_remove(struct device *dev)
{
        dwc_otg_device_t *otg_dev = dev_get_drvdata(dev);
        dwc_otg_pcd_t *pcd = otg_dev->pcd;
        dwc_otg_dev_if_t* dev_if = GET_CORE_IF(pcd)->dev_if;

        DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, dev);

        /*
         * Free the IRQ
         */
        free_irq(otg_dev->irq, pcd);

         /* start with the driver above us */
        if (pcd->driver) {
                /* should have been done already by driver model core */
                DWC_WARN("driver '%s' is still registered\n",
                                 pcd->driver->driver.name);
                usb_gadget_unregister_driver(pcd->driver);
        }
        device_unregister(&pcd->gadget.dev);

        if (GET_CORE_IF(pcd)->dma_enable) {
                dma_free_coherent (NULL, sizeof (*pcd->setup_pkt) * 5, pcd->setup_pkt, pcd->setup_pkt_dma_handle);
                dma_free_coherent (NULL, sizeof (uint16_t), pcd->status_buf, pcd->status_buf_dma_handle);
                if (GET_CORE_IF(pcd)->dma_desc_enable) {
                        dwc_otg_ep_free_desc_chain(dev_if->setup_desc_addr[0], dev_if->dma_setup_desc_addr[0], 1);
                        dwc_otg_ep_free_desc_chain(dev_if->setup_desc_addr[1], dev_if->dma_setup_desc_addr[1], 1);
                        dwc_otg_ep_free_desc_chain(dev_if->in_desc_addr, dev_if->dma_in_desc_addr, 1);
                        dwc_otg_ep_free_desc_chain(dev_if->out_desc_addr, dev_if->dma_out_desc_addr, 1);
                }
        }
        else {
                kfree (pcd->setup_pkt);
                kfree (pcd->status_buf);
        }

        kfree(pcd);
        otg_dev->pcd = 0;
}

/**
 * This function registers a gadget driver with the PCD.
 *
 * When a driver is successfully registered, it will receive control
 * requests including set_configuration(), which enables non-control
 * requests.  then usb traffic follows until a disconnect is reported.
 * then a host may connect again, or the driver might get unbound.
 *
 * @param driver The driver being registered
 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
int usb_gadget_probe_driver(struct usb_gadget_driver *driver, int (*bind)(struct usb_gadget *))
#else
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
#endif
{
        int retval;
        int (*d_bind)(struct usb_gadget *);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
        d_bind = bind;
#else
        d_bind = driver->bind;
#endif

        DWC_DEBUGPL(DBG_PCD, "registering gadget driver '%s'\n", driver->driver.name);

        if (!driver || driver->speed == USB_SPEED_UNKNOWN ||
                !d_bind ||
                !driver->unbind ||
                !driver->disconnect ||
                !driver->setup) {
                DWC_DEBUGPL(DBG_PCDV,"EINVAL\n");
                return -EINVAL;
        }
        if (s_pcd == 0) {
                DWC_DEBUGPL(DBG_PCDV,"ENODEV\n");
                return -ENODEV;
        }
        if (s_pcd->driver != 0) {
                DWC_DEBUGPL(DBG_PCDV,"EBUSY (%p)\n", s_pcd->driver);
                return -EBUSY;
        }

        /* hook up the driver */
        s_pcd->driver = driver;
        s_pcd->gadget.dev.driver = &driver->driver;

        DWC_DEBUGPL(DBG_PCD, "bind to driver %s\n", driver->driver.name);
        retval = d_bind(&s_pcd->gadget);
        if (retval) {
                DWC_ERROR("bind to driver %s --> error %d\n",
                                        driver->driver.name, retval);
                s_pcd->driver = 0;
                s_pcd->gadget.dev.driver = 0;
                return retval;
        }
        DWC_DEBUGPL(DBG_ANY, "registered gadget driver '%s'\n",
                                        driver->driver.name);
        return 0;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
EXPORT_SYMBOL(usb_gadget_probe_driver);
#else
EXPORT_SYMBOL(usb_gadget_register_driver);
#endif

/**
 * This function unregisters a gadget driver
 *
 * @param driver The driver being unregistered
 */
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
        //DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, _driver);

        if (s_pcd == 0) {
                DWC_DEBUGPL(DBG_ANY, "%s Return(%d): s_pcd==0\n", __func__,
                                -ENODEV);
                return -ENODEV;
        }
        if (driver == 0 || driver != s_pcd->driver) {
                DWC_DEBUGPL(DBG_ANY, "%s Return(%d): driver?\n", __func__,
                                -EINVAL);
                return -EINVAL;
        }

        driver->unbind(&s_pcd->gadget);
        s_pcd->driver = 0;

        DWC_DEBUGPL(DBG_ANY, "unregistered driver '%s'\n",
                        driver->driver.name);
        return 0;
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);

#endif /* DWC_HOST_ONLY */