lpc214x_usbdev.c

          lpc214x_putreg(USBDEV_DEVINT_DEVSTAT, LPC214X_USBDEV_DEVINTCLR);

          /* Get device status */

          g_usbdev.devstatus = (ubyte)lpc214x_usbcmd(CMD_USB_DEV_GETSTATUS, 0);
          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DEVSTAT), (uint16)g_usbdev.devstatus);

          /* Device connection status */

          if (DEVSTATUS_CONNCHG(g_usbdev.devstatus))
            {
              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_CONNECTCHG), 0);
              if (DEVSTATUS_CONNECT(g_usbdev.devstatus))
                {
                   /* Host is connected */

                   if (!priv->attached)
                     {
                       /* We have a transition from unattached to attached */

                       usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_CONNECTED), 0);
                       priv->usbdev.speed = USB_SPEED_UNKNOWN;
                       lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);
                       priv->attached     = 1;
                    }
                 }

               /* Otherwise the host is not attached */

               else if (priv->attached)
                 {
                   usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DISCONNECTED), 0);
                   priv->usbdev.speed = USB_SPEED_UNKNOWN;
                   lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);
                   priv->attached = 0;
                   priv->paddrset = 0;
                 }
            }

          /* Device suspend status */

          if (DEVSTATUS_SUSPCHG(g_usbdev.devstatus))
            {
              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SUSPENDCHG), 0);
            }

          /* Device reset */

          if (DEVSTATUS_RESET(g_usbdev.devstatus))
            {
              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DEVRESET), 0);
              lpc214x_usbreset(priv);
            }
        }

      /* Slow EP interrupt */

      if ((devintstatus & USBDEV_DEVINT_EPSLOW) != 0)
        {
          /* Clear Slow EP interrupt */

          lpc214x_putreg(USBDEV_DEVINT_EPSLOW, LPC214X_USBDEV_DEVINTCLR);
          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPSLOW), 0);

          do
            {
              /* Read the endpoint interrupt status register */

              epintstatus = lpc214x_getreg(LPC214X_USBDEV_EPINTST);

              /* Loop twice:  Process software high priority interrupts
               * on the first pass and low priority interrupts on the
               * second.
               */

              softprio = priv->softprio;
              for (i = 0; i < 2; i++, softprio = ~softprio)
                {
                  /* On the first time through the loop, pending will be
                   * the bitset of high priority pending interrupts; on the
                   * second time throught it will be the bitset of low
                   * priority interrupts.
                   */

                  pending = epintstatus & softprio;

                  /* EP0 OUT interrupt indicated by bit0 == 1 */

                  if ((pending & 1) != 0)
                    {
                      /* Clear the endpoint interrupt */

                      uint32 result = lpc214x_epclrinterrupt(LPC214X_CTRLEP_OUT);
                      if (result & USBDEV_EPSETUPPACKET)
                        {
                          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EP0SETUP), (uint16)result);
                          lpc214x_ep0setup(priv);
                        }
                      else
                        {
                          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EP0OUT), priv->ep0state);
                          lpc214x_ep0dataoutinterrupt(priv);
                        }
                      break;
                    }

                  /* EP0 IN interrupt indicated by bit1 == 1 */

                  if ((pending & 2) != 0)
                    {
                      /* Clear the endpoint interrupt */

                      usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EP0IN), priv->ep0state);
                      (void)lpc214x_epclrinterrupt(LPC214X_CTRLEP_IN);
                      lpc214x_ep0dataininterrupt(priv);
                    }
                  pending >>= 2;

                  /* All other endpoints EP 1-31 */

                  for (epphy = 2; pending; epphy++, pending >>= 1)
                    {
                      /* Is the endpoint interrupt pending? */

                      if ((pending & 1) != 0)
                        {
                           /* Yes.. clear the endpoint interrupt */

                          (void)lpc214x_epclrinterrupt(epphy);

                          /* Get the endpoint sructure corresponding to the physical
                           * endpoint number.
                           */

                          privep =  &priv->eplist[epphy];

                          /* Check for complete on IN or OUT endpoint.  Odd physical
                           * endpoint addresses are IN endpoints.
                           */

                          if ((epphy & 1) != 0)
                            {
                              /* IN: device-to-host */

                              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPOUT), (uint16)epphy);
                              if (priv->usbdev.speed == USB_SPEED_UNKNOWN)
                                {
                                  priv->usbdev.speed = USB_SPEED_FULL;
                                  lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 1);
                                }

                              /* Write host data from the current write request (if any) */

                              lpc214x_wrrequest(privep);
                           }
                          else
                            {
                              /* OUT: host-to-device */

                              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPIN), (uint16)epphy);

                              /* Read host data into the current read request */

                             if (!lpc214x_rqempty(privep))
                                 {
                                  lpc214x_rdrequest(privep);
                                }
                              else
                                {
                                  uvdbg("Pending interrupt\n");
                                  priv->rxpending = 1;
                                }
                            }
                        }
                    }
                }
            }
          while (epintstatus);
        }
#ifdef CONFIG_LPC214X_USBDEV_DMA
    }

  /* Check for DMA interrupts */

  if ((lpc214x_getreg(LPC214X_USBDEV_INTST) & USBDEV_INTST_REQDMA) != 0)
    {
      /* First Software High priority and then low priority */

      uint32 tmp;

      /* Collect the DMA interrupt sources */

      dmaintstatus = 0;
      tmp = lpc214x_getreg(LPC214X_USBDEV_EOTINTST);
      if (lpc214x_getreg(LPC214X_USBDEV_DMAINTEN) & 1)
        {
          dmaintstatus |= tmp;
        }
      lpc214x_putreg(tmp, LPC214X_USBDEV_EOTINTCLR);

      tmp = lpc214x_getreg(LPC214X_USBDEV_NDDRINTST);
      if (lpc214x_getreg(LPC214X_USBDEV_DMAINTEN) & 2)
        {
          dmaintstatus |= tmp;
        }
      lpc214x_putreg(tmp, LPC214X_USBDEV_NDDRINTCLR);

      tmp = lpc214x_getreg(LPC214X_USBDEV_SYSERRINTST);
      if (lpc214x_getreg(LPC214X_USBDEV_DMAINTEN) & 4)
        {
          dmaintstatus |= tmp;
        }
      lpc214x_putreg(tmp, LPC214X_USBDEV_SYSERRINTCLR);

      /* Loop twice:  Process software high priority interrupts on the
       * first pass and low priority interrupts on the second.
       */

      softprio = priv->softprio;
      for (i = 0; i < 2; i++, softprio = ~softprio)
        {
          /* On the first time through the loop, pending will be
           * the bitset of high priority pending interrupts; on the
           * second time throught it will be the bitset of low
           * priority interrupts. Note that EP0 IN and OUT are
           * omitted.
           */

          pending = (dmaintstatus & softprio) >> 2;
          for (epphy = 2; pending; epphy++, pending >>= 1)
            {
              if ((pending & 1) != 0)
                {
                  usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPDMA), (uint16)epphy);
#warning DO WHAT?
                }
            }
        }
    }
#endif
  usbtrace(TRACE_INTEXIT(LPC214X_TRACEINTID_USB), 0);
  return OK;
}

/*******************************************************************************
 * Name: lpc214x_dmasetup
 *
 * Description:
 *   Setup for DMA Transfer
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static int lpc214x_dmasetup(struct lpc214x_usbdev_s *priv, ubyte epphy,
                            uint32 epmaxsize, uint32 nbytes, uint32 *isocpacket,
                            boolean isochronous);
{
  struct lpc214x_dmadesc_s *dmadesc = priv;
  uint32 reg;

#ifdef CONFIG_DEBUG
  if (!priv || epphy < 2)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return -EINVAL;
    }
#endif

  /* Check if a DMA descriptor has been assigned.  If not, than that indicates
   * that we will have to do parallel I/O
   */

  if (!dmadesc)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NODMADESC), 0);
      return -EBUSY;
    }

  /* Verify that the DMA descriptor is available */

  if ((dmadesc->status & USB_DMADESC_STATUSMASK) == USB_DMADESC_BEINGSERVICED)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_DMABUSY), 0);
      return -EBUSY; /* Shouldn't happen */
    }

  /* Init DMA Descriptor */

  dmadesc->nexdesc = 0;
  dmadesc->config  = USB_DMADESC_MODENORMAL |
                     ((epmaxsize << USB_DMADESC_PKTSIZESHIFT) & USB_DMADESC_PKTSIZEMASK) |
                     ((nbytes << USB_DMADESC_BULENSHIFT) & USB_DMADESC_BUFLENMASK);

#ifdef CONFIG_USBDEV_ISOCHRONOUS
  if (isochronous)
    {
      dmadesc->config |= USB_DMADESC_ISCOEP;
    }
#endif

  dmadesc->start = (uint32)&dmadesc->buffer;
  dmadesc->status = 0;

#ifdef CONFIG_USBDEV_ISOCHRONOUS
  dmadesc->size = (uint32)packet;
#endif

  /* Enable DMA tranfer for this endpoint */

  putreq32(1 << epphy, LPC214X_USBDEV_EPDMAEN);

  /* Check state of IN/OUT Ep buffer */

  reg = lpc214x_usbcmd(CMD_USB_EP_SELECT | epphy, 0);

  if ((LPC214X_EPPHYIN(epphy) &&  (reg & 0x60) == 0) ||
      (LPC214X_EPPHYOUT(epphy) &&  (reg & 0x60) == 0x60))
    {
      /* DMA should be "being serviced" */

      if ((dmadesc->status & USB_DMADESC_STATUSMASK) != USB_DMADESC_BEINGSERVICED))
        {
          /* Re-trigger the DMA Transfer */

          putreq21(1 << epphy, LPC214X_USBDEV_DMARCLR);
          putreq32(1 << epphy, LPC214X_USBDEV_EPDMAEN);
        }
    }
  return OK;
}
#endif /* CONFIG_LPC214X_USBDEV_DMA */

/*******************************************************************************
 * Name: lpc214x_dmarestart
 *
 * Description:
 *   Restart DMA Transfer
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static void lpc214x_dmarestart(ubyte epphy, uint32 descndx)
{
  uint32 reg;

  /* Clear DMA descriptor status */

  USB_DmaDesc[descndx].status = 0;

  /* Enable DMA transfer on the endpoint */

  lpc214x_putreg(1 << epph, LPC214X_USBDEV_EPDMAEN);

  /* Check the state of IN/OUT EP buffer */

  uint32 reg = lpc214x_usbcmd(CMD_USB_EP_SELECT | epphy, 0);
  if ((LPC214X_EPPHYIN(epphy) &&  (reg & 0x60) == 0) ||
      (LPC214X_EPPHYIN(epphy) &&  (reg & 0x60) == 0x60))
    {
      /* Re-trigger the DMA Transfer */

      putreq21(1 << epphy, LPC214X_USBDEV_DMARCLR);
      putreq32(1 << epphy, LPC214X_USBDEV_EPDMAEN);
    }
}
#endif /* CONFIG_LPC214X_USBDEV_DMA */

/*******************************************************************************
 * Name: lpc214x_dmadisable
 *
 * Description:
 *   Disable DMA transfer for the EP
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static void lpc214x_dmadisable(ubyte epphy)
{
  EPDMADIS = 1 << epphy;
}
#endif /* CONFIG_LPC214X_USBDEV_DMA */

/*******************************************************************************
 * Endpoint operations
 *******************************************************************************/

/*******************************************************************************
 * Name: lpc214x_epconfigure
 *
 * Description:
 *   Configure endpoint, making it usable
 *
 *******************************************************************************/

static int lpc214x_epconfigure(FAR struct usbdev_ep_s *ep,
                               FAR const struct usb_epdesc_s *desc)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  uint32 inten;
  int eplog;
  int epphy;

  usbtrace(TRACE_EPCONFIGURE, privep->epphy);

  eplog = desc->addr;
  epphy = LPC214X_EP_LOG2PHY(eplog);

  /* Realize the endpoint */

  lpc214x_eprealize(privep, 1, GETUINT16(desc->mxpacketsize));

  /* Enable and reset EP -- twice */

  lpc214x_usbcmd(CMD_USB_EP_SETSTATUS | epphy, 0);
  lpc214x_usbcmd(CMD_USB_EP_SETSTATUS | epphy, 0);

#ifdef CONFIG_LPC214X_USBDEV_DMA
  /* Enable DMA Ep interrupt (WO) */

   lpc214x_putreg(1 << epphy, LPC214X_USBDEV_EPDMAEN);
#else
  /* Enable Ep interrupt (R/W) */

   inten = lpc214x_getreg(LPC214X_USBDEV_EPINTEN);
   inten |= (1 << epphy);
   lpc214x_putreg(inten, LPC214X_USBDEV_EPINTEN);
#endif
   return OK;
}

/*******************************************************************************
 * Name: lpc214x_epdisable
 *
 * Description:
 *   The endpoint will no longer be used
 *
 *******************************************************************************/

static int lpc214x_epdisable(FAR struct usbdev_ep_s *ep)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  irqstate_t flags;
  uint32 mask = (1 << privep->epphy);
  uint32 reg;

#ifdef CONFIG_DEBUG
  if (!ep)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return -EINVAL;
    }
#endif
  usbtrace(TRACE_EPDISABLE, privep->epphy);

  /* Cancel any ongoing activity */

  flags = irqsave();
  lpc214x_cancelrequests(privep);

  /* Disable endpoint and interrupt */

  reg  = lpc214x_getreg(LPC214X_USBDEV_REEP);
  reg &= ~mask;
  lpc214x_putreg(reg, LPC214X_USBDEV_REEP);

  lpc214x_putreg(mask, LPC214X_USBDEV_EPDMADIS);

  reg  = lpc214x_getreg(LPC214X_USBDEV_EPINTEN);
  reg &= ~mask;
  lpc214x_putreg(reg, LPC214X_USBDEV_EPINTEN);

  irqrestore(flags);
  return OK;
}

/*******************************************************************************
 * Name: lpc214x_epallocreq
 *
 * Description:
 *   Allocate an I/O request
 *
 *******************************************************************************/

static FAR struct usbdev_req_s *lpc214x_epallocreq(FAR struct usbdev_ep_s *ep)
{
  FAR struct lpc214x_req_s *privreq;

#ifdef CONFIG_DEBUG
  if (!ep)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return NULL;
    }
#endif
  usbtrace(TRACE_EPALLOCREQ, ((FAR struct lpc214x_ep_s *)ep)->epphy);

  privreq = (FAR struct lpc214x_req_s *)malloc(sizeof(struct lpc214x_req_s));
  if (!privreq)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_ALLOCFAIL), 0);
      return NULL;
    }

  memset(privreq, 0, sizeof(struct lpc214x_req_s));
  return &privreq->req;
}

/*******************************************************************************
 * Name: lpc214x_epfreereq
 *
 * Description:
 *   Free an I/O request
 *
 *******************************************************************************/

static void lpc214x_epfreereq(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
{
  FAR struct lpc214x_req_s *privreq = (FAR struct lpc214x_req_s *)req;

#ifdef CONFIG_DEBUG
  if (!ep || !req)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return;
    }
#endif
  usbtrace(TRACE_EPFREEREQ, ((FAR struct lpc214x_ep_s *)ep)->epphy);

  free(privreq);
}

/*******************************************************************************
 * Name: lpc214x_epallocbuffer
 *
 * Description:
 *   Allocate an I/O buffer
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static FAR void *lpc214x_epallocbuffer(FAR struct usbdev_ep_s *ep, uint16 nbytes)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  int descndx;

  usbtrace(TRACE_EPALLOCBUFFER, privep->epphy);

  /* Find a free  DMA description */

#error "LOGIC INCOMPLETE"

  /* Set UDCA to the allocated DMA descriptor for this endpoint */

  USB_UDCA[privep->epphy] = &USB_DDESC[descndx];
  return  &USB_DDESC[descndx]
}
#endif

/*******************************************************************************
 * Name: lpc214x_epfreebuffer
 *
 * Description:
 *   Free an I/O buffer
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static void lpc214x_epfreebuffer(FAR struct usbdev_ep_s *ep, FAR void *buf)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;

  usbtrace(TRACE_EPFREEBUFFER, privep->epphy);

  /* Indicate that there is no DMA descriptor associated with this endpoint  */

  USB_UDCA[privep->epphy] = NULL;

  /* Mark the DMA descriptor as free for re-allocation */

#error "LOGIC INCOMPLETE"
}
#endif

/*******************************************************************************
 * Name: lpc214x_epsubmit
 *
 * Description:
 *   Submit an I/O request to the endpoint
 *
 *******************************************************************************/

static int lpc214x_epsubmit(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
{
  FAR struct lpc214x_req_s *privreq = (FAR struct lpc214x_req_s *)req;
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  FAR struct lpc214x_usbdev_s *priv;
  irqstate_t flags;
  int ret = OK;

#ifdef CONFIG_DEBUG
  if (!req || !req->callback || !req->buf || !ep)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return -EINVAL;
    }
#endif
  usbtrace(TRACE_EPSUBMIT, privep->epphy);
  priv = privep->dev;

  if (!priv->driver || priv->usbdev.speed == USB_SPEED_UNKNOWN)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NOTCONFIGURED), 0);
      return -ESHUTDOWN;
    }

  /* Handle the request from the class driver */

  req->result = -EINPROGRESS;
  req->xfrd   = 0;
  flags       = irqsave();

  /* If we are stalled, then drop all requests on the floor */

  if (privep->stalled)
    {
      lpc214x_abortrequest(privep, privreq, -EBUSY);
      ret = -EBUSY;
    }

  /* Handle IN (device-to-host) requests */

  else if (LPC214X_EPPHYIN(privep->epphy))
    {
      /* Add the new request to the request queue for the endpoint */

      lpc214x_rqenqueue(privep, privreq);
      usbtrace(TRACE_INREQQUEUED(privep->epphy), privreq->req.len);
      ret = lpc214x_wrrequest(privep);
    }

  /* Handle OUT (host-to-device) requests -- but only if one is expected*/

  else if (priv->rxpending)
    {
      /* Add the new request to the request queue for the endpoint */

      privep->txnullpkt = 0;
      lpc214x_rqenqueue(privep, privreq);
      usbtrace(TRACE_OUTREQQUEUED(privep->epphy), privreq->req.len);
      ret = lpc214x_rdrequest(privep);
      priv->rxpending = 0;
    }

  /* Unexpected or illformed request */

  else
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADREQUEST), 0);
      lpc214x_abortrequest(privep, privreq, -EBUSY);
      ret = -EINVAL;
    }

  irqrestore(flags);
  return ret;
}

/*******************************************************************************
 * Name: lpc214x_epcancel
 *
 * Description:
 *   Cancel an I/O request previously sent to an endpoint
 *
 *******************************************************************************/

static int lpc214x_epcancel(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  FAR struct lpc214x_usbdev_s *priv;
  irqstate_t flags;

#ifdef CONFIG_DEBUG
  if (!ep || !req)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return -EINVAL;
    }
#endif
  usbtrace(TRACE_EPCANCEL, privep->epphy);
  priv = privep->dev;

  flags = irqsave();
  lpc214x_cancelrequests(privep);
  irqrestore(flags);
  return OK;
}

/*******************************************************************************
 * Name: lpc214x_epstall
 *
 * Description:
 *   Stall or resume and endpoint
 *
 *******************************************************************************/

static int lpc214x_epstall(FAR struct usbdev_ep_s *ep, boolean resume)
{
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  usbtrace(resume ? TRACE_EPRESUME : TRACE_EPSTALL, privep->epphy);
  lpc214x_usbcmd(CMD_USB_EP_SETSTATUS | privep->epphy, (resume ? 0 : USBDEV_EPSTALL));
  return OK;
}

/*******************************************************************************
 * Device operations
 *******************************************************************************/

/*******************************************************************************
 * Name: lcp214x_allocep
 *
 * Description:
 *   Allocate an endpoint matching the parameters.
 *
 * Input Parameters:
 *   epphy  - 7-bit physical endpoint number (without direction bit).  Zero means
 *            that any endpoint matching the other requirements will suffice.
 *   in     - TRUE: IN (device-to-host) endpoint requested
 *   eptype - Endpoint type.  One of {USB_EP_ATTR_XFER_ISOC, USB_EP_ATTR_XFER_BULK,
 *            USB_EP_ATTR_XFER_INT}
 *
 *******************************************************************************/

static FAR struct usbdev_ep_s *lcp214x_allocep(FAR struct usbdev_s *dev, ubyte epphy,
                                               boolean in, ubyte eptype)
{
  FAR struct lpc214x_usbdev_s *priv = (FAR struct lpc214x_usbdev_s *)dev;
  uint32 epset = LPC214X_EPALLSET;
  irqstate_t flags;
  int epndx = 0;

  usbtrace(TRACE_DEVALLOCEP, 0);

  /* epphy=0 means that any endpoint will do */

  if (epphy > 0)
    {
      if (epphy >= LPC214X_NLOGENDPOINTS)
        {
         usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADEPNO), 0);
         return NULL;
        }

      epset &= 3 << epphy;
    }

  /* Get the subset matching the requested direction */

  if (in)
    {
      epset &= LPC214X_EPINSET;
    }
  else
    {
      epset &= LPC214X_EPOUTSET;
    }

  /* Get the subset matching the requested type */

  switch (eptype)
    {
    case USB_EP_ATTR_XFER_INT: /* Interrupt endpoint */
      epset &= LPC214X_EPINTRSET;
      break;

    case USB_EP_ATTR_XFER_BULK: /* Bulk endpoint */
      epset &= LPC214X_EPBULKSET;
      break;

    case USB_EP_ATTR_XFER_ISOC: /* Isochronous endpoint */
      epset &= LPC214X_EPBULKSET;
      break;

    case USB_EP_ATTR_XFER_CONTROL: /* Control endpoint -- not a valid choice */
    default:
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADEPTYPE), 0);
      return NULL;
    }

  /* Is the resulting endpoint supported by the LPC214x? */

  if (epset)
    {
      /* Yes.. now see if any of the request endpoints are available */

      flags = irqsave();
      epset &= priv->epavail;
      if (epset)
        {
          /* Select the lowest bit in the set of matching, available endpoints */

          for (epndx = 2; epndx < LPC214X_NPHYSENDPOINTS; epndx++)
            {
              uint32 bit = 1 << epndx;
              if ((epset & bit) == 0)
                {
                  /* Mark the endpoint no longer available */

                  priv->wravail &= ~bit;
                  irqrestore(flags);

                  /* And return the pointer to the standard endpoint structure */

                  return &priv->eplist[epndx].ep;
                }
            }
          /* Shouldn't get here */
        }
      irqrestore(flags);
    }

  usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NOEP), 0);
  return NULL;
}

/*******************************************************************************
 * Name: lpc214x_freeep
 *
 * Description:
 *   Free the previously allocated endpoint
 *
 *******************************************************************************/

static void lpc214x_freeep(FAR struct usbdev_s *dev, FAR struct usbdev_ep_s *ep)
{
  FAR struct lpc214x_usbdev_s *priv = (FAR struct lpc214x_usbdev_s *)dev;
  FAR struct lpc214x_ep_s *privep = (FAR struct lpc214x_ep_s *)ep;
  irqstate_t flags;

  usbtrace(TRACE_DEVFREEEP, (uint16)privep->epphy);

  if (priv && privep)
    {
      /* Mark the endpoint as available */

      flags = irqsave();
      priv->wravail &= ~(1 << privep->epphy);
      irqrestore(flags);
    }
}

/*******************************************************************************
 * Name: lpc214x_getframe
 *
 * Description:
 *   Returns the current frame number
 *
 *******************************************************************************/

static int lpc214x_getframe(struct usbdev_s *dev)
{
#ifdef CONFIG_LPC214X_USBDEV_FRAME_INTERRUPT
  FAR struct lpc214x_usbdev_s *priv = (FAR struct lpc214x_usbdev_s *)dev;

  /* Return last valid value of SOF read by the interrupt handler */

  usbtrace(TRACE_DEVGETFRAME, (uint16)priv->sof);
  return priv->sof;
#else
  /* Return the last frame number detected by the hardware */

  usbtrace(TRACE_DEVGETFRAME, 0);
  return (int)lpc214x_usbcmd(CMD_USB_DEV_READFRAMENO, 0);
#endif
}

/*******************************************************************************
 * Name: lpc214x_wakeup
 *
 * Description:
 *   Tries to wake up the host connected to this device
 *
 *******************************************************************************/

static int lpc214x_wakeup(struct usbdev_s *dev)
{
  ubyte arg = USBDEV_DEVSTATUS_SUSPEND;
  irqstate_t flags;

  usbtrace(TRACE_DEVWAKEUP, (uint16)g_usbdev.devstatus);

  flags = irqsave();
  if (DEVSTATUS_CONNECT(g_usbdev.devstatus))
    {
      arg |= USBDEV_DEVSTATUS_CONNECT;
    }

  lpc214x_usbcmd(CMD_USB_DEV_SETSTATUS, arg);
  irqrestore(flags);
  return OK;
}

/*******************************************************************************
 * Name: lpc214x_selfpowered
 *
 * Description:
 *   Sets/clears the device selfpowered feature 
 *
 *******************************************************************************/

static int lpc214x_selfpowered(struct usbdev_s *dev, boolean selfpowered)
{
  FAR struct lpc214x_usbdev_s *priv = (FAR struct lpc214x_usbdev_s *)dev;

  usbtrace(TRACE_DEVSELFPOWERED, (uint16)selfpowered);

#ifdef CONFIG_DEBUG
  if (!dev)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDPARMS), 0);
      return -ENODEV;
    }
#endif

  priv->selfpowered = selfpowered;
  return OK;
}

/*******************************************************************************
 * Name: lpc214x_pullup
 *
 * Description:
 *   Software-controlled connect to/disconnect from USB host
 *
 *******************************************************************************/

static int lpc214x_pullup(struct usbdev_s *dev, boolean enable)
{
  usbtrace(TRACE_DEVPULLUP, (uint16)enable);

  /* The USBDEV_DEVSTATUS_CONNECT bit in the CMD_USB_DEV_SETSTATUS command
   * controls the LPC214x SoftConnect_N output pin that is used for SoftConnect.
   */

  lpc214x_usbcmd(CMD_USB_DEV_SETSTATUS, (enable ? USBDEV_DEVSTATUS_CONNECT : 0));
  return OK;
}

/*******************************************************************************
 * Public Functions
 *******************************************************************************/

/*******************************************************************************
 * Name: up_usbinitialize
 *
 * Description:
 *   Initialize USB hardware.
 *
 * Assumptions:
 * - This function is called very early in the initialization sequence
 * - PLL and GIO pin initialization is not performed here but should been in
 *   the low-level  boot logic:  PLL1 must be configured for operation at 48MHz
 *   and P0.23 and PO.31 in PINSEL1 must be configured for Vbus and USB connect
 *   LED.
 *
 *******************************************************************************/

void up_usbinitialize(void)
{
  struct lpc214x_usbdev_s *priv = &g_usbdev;
  uint32 reg;
  int i;

  usbtrace(TRACE_DEVINIT, 0);

  /* Disable USB interrupts */

  lpc214x_putreg(0, LPC214X_USBDEV_INTST);

  /* Initialize the device state structure */

  memset(priv, 0, sizeof(struct lpc214x_usbdev_s));
  priv->usbdev.ops = &g_devops;
  priv->usbdev.ep0 = &priv->eplist[LPC214X_EP0_IN].ep;
  priv->wravail    = LPC214X_EPALLSET;

  /* Initialize the endpoint list */

  for (i = 0; i < LPC214X_NPHYSENDPOINTS; i++)
    {
      uint32 bit = 1 << i;

      /* Set endpoint operations, reference to driver structure (not
       * really necessary because there is only one controller), and
       * the physical endpoint number (which is just the index to the
       * endpoint).
       */
      priv->eplist[i].ep.ops       = &g_epops;
      priv->eplist[i].dev          = priv;
      priv->eplist[i].epphy        = i;

      /* The maximum packet size may depend on the type of endpoint */