MdeModulePkg EhciDxe: Use common buffer for AsyncInterruptTransfer

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / EhciDxe / EhciUrb.c

/** @file\r
\r
    This file contains URB request, each request is warpped in a\r
    URB (Usb Request Block).\r
\r
Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "Ehci.h"\r
\r
\r
/**\r
  Create a single QTD to hold the data.\r
\r
  @param  Ehc                   The EHCI device.\r
  @param  Data                  The cpu memory address of current data not associated with a QTD.\r
  @param  DataPhy               The pci bus address of current data not associated with a QTD.\r
  @param  DataLen               The length of the data.\r
  @param  PktId                 Packet ID to use in the QTD.\r
  @param  Toggle                Data toggle to use in the QTD.\r
  @param  MaxPacket             Maximu packet length of the endpoint.\r
\r
  @return Created QTD or NULL if failed to create one.\r
\r
**/\r
EHC_QTD *\r
EhcCreateQtd (\r
  IN USB2_HC_DEV          *Ehc,\r
  IN UINT8                *Data,\r
  IN UINT8                *DataPhy,\r
  IN UINTN                DataLen,\r
  IN UINT8                PktId,\r
  IN UINT8                Toggle,\r
  IN UINTN                MaxPacket\r
  )\r
{\r
  EHC_QTD                 *Qtd;\r
  QTD_HW                  *QtdHw;\r
  UINTN                   Index;\r
  UINTN                   Len;\r
  UINTN                   ThisBufLen;\r
\r
  ASSERT (Ehc != NULL);\r
\r
  Qtd = UsbHcAllocateMem (Ehc->MemPool, sizeof (EHC_QTD));\r
\r
  if (Qtd == NULL) {\r
    return NULL;\r
  }\r
\r
  Qtd->Signature    = EHC_QTD_SIG;\r
  Qtd->Data         = Data;\r
  Qtd->DataLen      = 0;\r
\r
  InitializeListHead (&Qtd->QtdList);\r
\r
  QtdHw             = &Qtd->QtdHw;\r
  QtdHw->NextQtd    = QTD_LINK (NULL, TRUE);\r
  QtdHw->AltNext    = QTD_LINK (NULL, TRUE);\r
  QtdHw->Status     = QTD_STAT_ACTIVE;\r
  QtdHw->Pid        = PktId;\r
  QtdHw->ErrCnt     = QTD_MAX_ERR;\r
  QtdHw->Ioc        = 0;\r
  QtdHw->TotalBytes = 0;\r
  QtdHw->DataToggle = Toggle;\r
\r
  //\r
  // Fill in the buffer points\r
  //\r
  if (Data != NULL) {\r
    Len = 0;\r
\r
    for (Index = 0; Index <= QTD_MAX_BUFFER; Index++) {\r
      //\r
      // Set the buffer point (Check page 41 EHCI Spec 1.0). No need to\r
      // compute the offset and clear Reserved fields. This is already\r
      // done in the data point.\r
      //\r
      QtdHw->Page[Index]      = EHC_LOW_32BIT (DataPhy);\r
      QtdHw->PageHigh[Index]  = EHC_HIGH_32BIT (DataPhy);\r
\r
      ThisBufLen              = QTD_BUF_LEN - (EHC_LOW_32BIT (DataPhy) & QTD_BUF_MASK);\r
\r
      if (Len + ThisBufLen >= DataLen) {\r
        Len = DataLen;\r
        break;\r
      }\r
\r
      Len += ThisBufLen;\r
      Data += ThisBufLen;\r
      DataPhy += ThisBufLen;\r
    }\r
\r
    //\r
    // Need to fix the last pointer if the Qtd can't hold all the\r
    // user's data to make sure that the length is in the unit of\r
    // max packets. If it can hold all the data, there is no such\r
    // need.\r
    //\r
    if (Len < DataLen) {\r
      Len = Len - Len % MaxPacket;\r
    }\r
\r
    QtdHw->TotalBytes = (UINT32) Len;\r
    Qtd->DataLen      = Len;\r
  }\r
\r
  return Qtd;\r
}\r
\r
\r
\r
/**\r
  Initialize the queue head for interrupt transfer,\r
  that is, initialize the following three fields:\r
  1. SplitXState in the Status field\r
  2. Microframe S-mask\r
  3. Microframe C-mask\r
\r
  @param  Ep                    The queue head's related endpoint.\r
  @param  QhHw                  The queue head to initialize.\r
\r
**/\r
VOID\r
EhcInitIntQh (\r
  IN USB_ENDPOINT         *Ep,\r
  IN QH_HW                *QhHw\r
  )\r
{\r
  //\r
  // Because UEFI interface can't utilitize an endpoint with\r
  // poll rate faster than 1ms, only need to set one bit in\r
  // the queue head. simple. But it may be changed later. If\r
  // sub-1ms interrupt is supported, need to update the S-Mask\r
  // here\r
  //\r
  if (Ep->DevSpeed == EFI_USB_SPEED_HIGH) {\r
    QhHw->SMask = QH_MICROFRAME_0;\r
    return ;\r
  }\r
\r
  //\r
  // For low/full speed device, the transfer must go through\r
  // the split transaction. Need to update three fields\r
  // 1. SplitXState in the status\r
  // 2. Microframe S-Mask\r
  // 3. Microframe C-Mask\r
  // UEFI USB doesn't exercise admission control. It simplely\r
  // schedule the high speed transactions in microframe 0, and\r
  // full/low speed transactions at microframe 1. This also\r
  // avoid the use of FSTN.\r
  //\r
  QhHw->SMask = QH_MICROFRAME_1;\r
  QhHw->CMask = QH_MICROFRAME_3 | QH_MICROFRAME_4 | QH_MICROFRAME_5;\r
}\r
\r
\r
\r
/**\r
  Allocate and initialize a EHCI queue head.\r
\r
  @param  Ehci                  The EHCI device.\r
  @param  Ep                    The endpoint to create queue head for.\r
\r
  @return Created queue head or NULL if failed to create one.\r
\r
**/\r
EHC_QH *\r
EhcCreateQh (\r
  IN USB2_HC_DEV          *Ehci,\r
  IN USB_ENDPOINT         *Ep\r
  )\r
{\r
  EHC_QH                  *Qh;\r
  QH_HW                   *QhHw;\r
\r
  Qh = UsbHcAllocateMem (Ehci->MemPool, sizeof (EHC_QH));\r
\r
  if (Qh == NULL) {\r
    return NULL;\r
  }\r
\r
  Qh->Signature       = EHC_QH_SIG;\r
  Qh->NextQh          = NULL;\r
  Qh->Interval        = Ep->PollRate;\r
\r
  InitializeListHead (&Qh->Qtds);\r
\r
  QhHw                = &Qh->QhHw;\r
  QhHw->HorizonLink   = QH_LINK (NULL, 0, TRUE);\r
  QhHw->DeviceAddr    = Ep->DevAddr;\r
  QhHw->Inactive      = 0;\r
  QhHw->EpNum         = Ep->EpAddr;\r
  QhHw->EpSpeed       = Ep->DevSpeed;\r
  QhHw->DtCtrl        = 0;\r
  QhHw->ReclaimHead   = 0;\r
  QhHw->MaxPacketLen  = (UINT32) Ep->MaxPacket;\r
  QhHw->CtrlEp        = 0;\r
  QhHw->NakReload     = QH_NAK_RELOAD;\r
  QhHw->HubAddr       = Ep->HubAddr;\r
  QhHw->PortNum       = Ep->HubPort;\r
  QhHw->Multiplier    = 1;\r
  QhHw->DataToggle    = Ep->Toggle;\r
\r
  if (Ep->DevSpeed != EFI_USB_SPEED_HIGH) {\r
    QhHw->Status |= QTD_STAT_DO_SS;\r
  }\r
\r
  switch (Ep->Type) {\r
  case EHC_CTRL_TRANSFER:\r
    //\r
    // Special initialization for the control transfer:\r
    // 1. Control transfer initialize data toggle from each QTD\r
    // 2. Set the Control Endpoint Flag (C) for low/full speed endpoint.\r
    //\r
    QhHw->DtCtrl = 1;\r
\r
    if (Ep->DevSpeed != EFI_USB_SPEED_HIGH) {\r
      QhHw->CtrlEp = 1;\r
    }\r
    break;\r
\r
  case EHC_INT_TRANSFER_ASYNC:\r
  case EHC_INT_TRANSFER_SYNC:\r
    //\r
    // Special initialization for the interrupt transfer\r
    // to set the S-Mask and C-Mask\r
    //\r
    QhHw->NakReload = 0;\r
    EhcInitIntQh (Ep, QhHw);\r
    break;\r
\r
  case EHC_BULK_TRANSFER:\r
    if ((Ep->DevSpeed == EFI_USB_SPEED_HIGH) && (Ep->Direction == EfiUsbDataOut)) {\r
      QhHw->Status |= QTD_STAT_DO_PING;\r
    }\r
\r
    break;\r
  }\r
\r
  return Qh;\r
}\r
\r
\r
/**\r
  Convert the poll interval from application to that\r
  be used by EHCI interface data structure. Only need\r
  to get the max 2^n that is less than interval. UEFI\r
  can't support high speed endpoint with a interval less\r
  than 8 microframe because interval is specified in\r
  the unit of ms (millisecond).\r
\r
  @param  Interval              The interval to convert.\r
\r
  @return The converted interval.\r
\r
**/\r
UINTN\r
EhcConvertPollRate (\r
  IN  UINTN               Interval\r
  )\r
{\r
  UINTN                   BitCount;\r
\r
  if (Interval == 0) {\r
    return 1;\r
  }\r
\r
  //\r
  // Find the index (1 based) of the highest non-zero bit\r
  //\r
  BitCount = 0;\r
\r
  while (Interval != 0) {\r
    Interval >>= 1;\r
    BitCount++;\r
  }\r
\r
  return (UINTN)1 << (BitCount - 1);\r
}\r
\r
\r
/**\r
  Free a list of QTDs.\r
\r
  @param  Ehc                   The EHCI device.\r
  @param  Qtds                  The list head of the QTD.\r
\r
**/\r
VOID\r
EhcFreeQtds (\r
  IN USB2_HC_DEV          *Ehc,\r
  IN LIST_ENTRY           *Qtds\r
  )\r
{\r
  LIST_ENTRY              *Entry;\r
  LIST_ENTRY              *Next;\r
  EHC_QTD                 *Qtd;\r
\r
  EFI_LIST_FOR_EACH_SAFE (Entry, Next, Qtds) {\r
    Qtd = EFI_LIST_CONTAINER (Entry, EHC_QTD, QtdList);\r
\r
    RemoveEntryList (&Qtd->QtdList);\r
    UsbHcFreeMem (Ehc->MemPool, Qtd, sizeof (EHC_QTD));\r
  }\r
}\r
\r
\r
/**\r
  Free an allocated URB. It is possible for it to be partially inited.\r
\r
  @param  Ehc                   The EHCI device.\r
  @param  Urb                   The URB to free.\r
\r
**/\r
VOID\r
EhcFreeUrb (\r
  IN USB2_HC_DEV          *Ehc,\r
  IN URB                  *Urb\r
  )\r
{\r
  EFI_PCI_IO_PROTOCOL       *PciIo;\r
\r
  PciIo = Ehc->PciIo;\r
\r
  if (Urb->RequestPhy != NULL) {\r
    PciIo->Unmap (PciIo, Urb->RequestMap);\r
  }\r
\r
  if (Urb->DataMap != NULL) {\r
    PciIo->Unmap (PciIo, Urb->DataMap);\r
  }\r
\r
  if (Urb->AllocateCommonBuffer) {\r
    PciIo->FreeBuffer (\r
             PciIo,\r
             EFI_SIZE_TO_PAGES (Urb->DataLen),\r
             Urb->Data\r
             );\r
  }\r
\r
  if (Urb->Qh != NULL) {\r
    //\r
    // Ensure that this queue head has been unlinked from the\r
    // schedule data structures. Free all the associated QTDs\r
    //\r
    EhcFreeQtds (Ehc, &Urb->Qh->Qtds);\r
    UsbHcFreeMem (Ehc->MemPool, Urb->Qh, sizeof (EHC_QH));\r
  }\r
\r
  gBS->FreePool (Urb);\r
}\r
\r
\r
/**\r
  Create a list of QTDs for the URB.\r
\r
  @param  Ehc                   The EHCI device.\r
  @param  Urb                   The URB to create QTDs for.\r
\r
  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource for QTD.\r
  @retval EFI_SUCCESS           The QTDs are allocated for the URB.\r
\r
**/\r
EFI_STATUS\r
EhcCreateQtds (\r
  IN USB2_HC_DEV          *Ehc,\r
  IN URB                  *Urb\r
  )\r
{\r
  USB_ENDPOINT            *Ep;\r
  EHC_QH                  *Qh;\r
  EHC_QTD                 *Qtd;\r
  EHC_QTD                 *StatusQtd;\r
  EHC_QTD                 *NextQtd;\r
  LIST_ENTRY              *Entry;\r
  UINT32                  AlterNext;\r
  UINT8                   Toggle;\r
  UINTN                   Len;\r
  UINT8                   Pid;\r
  EFI_PHYSICAL_ADDRESS    PhyAddr;\r
\r
  ASSERT ((Urb != NULL) && (Urb->Qh != NULL));\r
\r
  //\r
  // EHCI follows the alternet next QTD pointer if it meets\r
  // a short read and the AlterNext pointer is valid. UEFI\r
  // EHCI driver should terminate the transfer except the\r
  // control transfer.\r
  //\r
  Toggle    = 0;\r
  Qh        = Urb->Qh;\r
  Ep        = &Urb->Ep;\r
  StatusQtd = NULL;\r
  AlterNext = QTD_LINK (NULL, TRUE);\r
\r
  PhyAddr   = UsbHcGetPciAddressForHostMem (Ehc->MemPool, Ehc->ShortReadStop, sizeof (EHC_QTD));\r
  if (Ep->Direction == EfiUsbDataIn) {\r
    AlterNext = QTD_LINK (PhyAddr, FALSE);\r
  }\r
\r
  //\r
  // Build the Setup and status packets for control transfer\r
  //\r
  if (Urb->Ep.Type == EHC_CTRL_TRANSFER) {\r
    Len = sizeof (EFI_USB_DEVICE_REQUEST);\r
    Qtd = EhcCreateQtd (Ehc, (UINT8 *)Urb->Request, (UINT8 *)Urb->RequestPhy, Len, QTD_PID_SETUP, 0, Ep->MaxPacket);\r
\r
    if (Qtd == NULL) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
\r
    InsertTailList (&Qh->Qtds, &Qtd->QtdList);\r
\r
    //\r
    // Create the status packet now. Set the AlterNext to it. So, when\r
    // EHCI meets a short control read, it can resume at the status stage.\r
    // Use the opposite direction of the data stage, or IN if there is\r
    // no data stage.\r
    //\r
    if (Ep->Direction == EfiUsbDataIn) {\r
      Pid = QTD_PID_OUTPUT;\r
    } else {\r
      Pid = QTD_PID_INPUT;\r
    }\r
\r
    StatusQtd = EhcCreateQtd (Ehc, NULL, NULL, 0, Pid, 1, Ep->MaxPacket);\r
\r
    if (StatusQtd == NULL) {\r
      goto ON_ERROR;\r
    }\r
\r
    if (Ep->Direction == EfiUsbDataIn) {\r
      PhyAddr   = UsbHcGetPciAddressForHostMem (Ehc->MemPool, StatusQtd, sizeof (EHC_QTD));\r
      AlterNext = QTD_LINK (PhyAddr, FALSE);\r
    }\r
\r
    Toggle = 1;\r
  }\r
\r
  //\r
  // Build the data packets for all the transfers\r
  //\r
  if (Ep->Direction == EfiUsbDataIn) {\r
    Pid = QTD_PID_INPUT;\r
  } else {\r
    Pid = QTD_PID_OUTPUT;\r
  }\r
\r
  Qtd = NULL;\r
  Len = 0;\r
\r
  while (Len < Urb->DataLen) {\r
    Qtd = EhcCreateQtd (\r
            Ehc,\r
            (UINT8 *) Urb->Data + Len,\r
            (UINT8 *) Urb->DataPhy + Len,\r
            Urb->DataLen - Len,\r
            Pid,\r
            Toggle,\r
            Ep->MaxPacket\r
            );\r
\r
    if (Qtd == NULL) {\r
      goto ON_ERROR;\r
    }\r
\r
    Qtd->QtdHw.AltNext = AlterNext;\r
    InsertTailList (&Qh->Qtds, &Qtd->QtdList);\r
\r
    //\r
    // Switch the Toggle bit if odd number of packets are included in the QTD.\r
    //\r
    if (((Qtd->DataLen + Ep->MaxPacket - 1) / Ep->MaxPacket) % 2) {\r
      Toggle = (UINT8) (1 - Toggle);\r
    }\r
\r
    Len += Qtd->DataLen;\r
  }\r
\r
  //\r
  // Insert the status packet for control transfer\r
  //\r
  if (Ep->Type == EHC_CTRL_TRANSFER) {\r
    InsertTailList (&Qh->Qtds, &StatusQtd->QtdList);\r
  }\r
\r
  //\r
  // OK, all the QTDs needed are created. Now, fix the NextQtd point\r
  //\r
  EFI_LIST_FOR_EACH (Entry, &Qh->Qtds) {\r
    Qtd = EFI_LIST_CONTAINER (Entry, EHC_QTD, QtdList);\r
\r
    //\r
    // break if it is the last entry on the list\r
    //\r
    if (Entry->ForwardLink == &Qh->Qtds) {\r
      break;\r
    }\r
\r
    NextQtd             = EFI_LIST_CONTAINER (Entry->ForwardLink, EHC_QTD, QtdList);\r
    PhyAddr             = UsbHcGetPciAddressForHostMem (Ehc->MemPool, NextQtd, sizeof (EHC_QTD));\r
    Qtd->QtdHw.NextQtd  = QTD_LINK (PhyAddr, FALSE);\r
  }\r
\r
  //\r
  // Link the QTDs to the queue head\r
  //\r
  NextQtd           = EFI_LIST_CONTAINER (Qh->Qtds.ForwardLink, EHC_QTD, QtdList);\r
  PhyAddr           = UsbHcGetPciAddressForHostMem (Ehc->MemPool, NextQtd, sizeof (EHC_QTD));\r
  Qh->QhHw.NextQtd  = QTD_LINK (PhyAddr, FALSE);\r
  return EFI_SUCCESS;\r
\r
ON_ERROR:\r
  EhcFreeQtds (Ehc, &Qh->Qtds);\r
  return EFI_OUT_OF_RESOURCES;\r
}\r
\r
\r
/**\r
  Create a new URB and its associated QTD.\r
\r
  @param  Ehc                   The EHCI device.\r
  @param  DevAddr               The device address.\r
  @param  EpAddr                Endpoint addrress & its direction.\r
  @param  DevSpeed              The device speed.\r
  @param  Toggle                Initial data toggle to use.\r
  @param  MaxPacket             The max packet length of the endpoint.\r
  @param  Hub                   The transaction translator to use.\r
  @param  Type                  The transaction type.\r
  @param  Request               The standard USB request for control transfer.\r
  @param  AllocateCommonBuffer  Indicate whether need to allocate common buffer for data transfer.\r
  @param  Data                  The user data to transfer, NULL if AllocateCommonBuffer is TRUE.\r
  @param  DataLen               The length of data buffer.\r
  @param  Callback              The function to call when data is transferred.\r
  @param  Context               The context to the callback.\r
  @param  Interval              The interval for interrupt transfer.\r
\r
  @return Created URB or NULL.\r
\r
**/\r
URB *\r
EhcCreateUrb (\r
  IN USB2_HC_DEV                        *Ehc,\r
  IN UINT8                              DevAddr,\r
  IN UINT8                              EpAddr,\r
  IN UINT8                              DevSpeed,\r
  IN UINT8                              Toggle,\r
  IN UINTN                              MaxPacket,\r
  IN EFI_USB2_HC_TRANSACTION_TRANSLATOR *Hub,\r
  IN UINTN                              Type,\r
  IN EFI_USB_DEVICE_REQUEST             *Request,\r
  IN BOOLEAN                            AllocateCommonBuffer,\r
  IN VOID                               *Data,\r
  IN UINTN                              DataLen,\r
  IN EFI_ASYNC_USB_TRANSFER_CALLBACK    Callback,\r
  IN VOID                               *Context,\r
  IN UINTN                              Interval\r
  )\r
{\r
  USB_ENDPOINT                  *Ep;\r
  EFI_PHYSICAL_ADDRESS          PhyAddr;\r
  EFI_PCI_IO_PROTOCOL_OPERATION MapOp;\r
  EFI_PCI_IO_PROTOCOL           *PciIo;\r
  EFI_STATUS                    Status;\r
  UINTN                         Len;\r
  URB                           *Urb;\r
  VOID                          *Map;\r
\r
  Urb = AllocateZeroPool (sizeof (URB));\r
\r
  if (Urb == NULL) {\r
    return NULL;\r
  }\r
\r
  Urb->Signature  = EHC_URB_SIG;\r
  InitializeListHead (&Urb->UrbList);\r
\r
  Ep              = &Urb->Ep;\r
  Ep->DevAddr     = DevAddr;\r
  Ep->EpAddr      = (UINT8) (EpAddr & 0x0F);\r
  Ep->Direction   = (((EpAddr & 0x80) != 0) ? EfiUsbDataIn : EfiUsbDataOut);\r
  Ep->DevSpeed    = DevSpeed;\r
  Ep->MaxPacket   = MaxPacket;\r
\r
  Ep->HubAddr     = 0;\r
  Ep->HubPort     = 0;\r
\r
  if (DevSpeed != EFI_USB_SPEED_HIGH) {\r
    ASSERT (Hub != NULL);\r
\r
    Ep->HubAddr   = Hub->TranslatorHubAddress;\r
    Ep->HubPort   = Hub->TranslatorPortNumber;\r
  }\r
\r
  Ep->Toggle      = Toggle;\r
  Ep->Type        = Type;\r
  Ep->PollRate    = EhcConvertPollRate (Interval);\r
\r
  Urb->Request    = Request;\r
  if (AllocateCommonBuffer) {\r
    ASSERT (Data == NULL);\r
    Status = Ehc->PciIo->AllocateBuffer (\r
                           Ehc->PciIo,\r
                           AllocateAnyPages,\r
                           EfiBootServicesData,\r
                           EFI_SIZE_TO_PAGES (DataLen),\r
                           &Data,\r
                           0\r
                           );\r
    if (EFI_ERROR (Status) || (Data == NULL)) {\r
      FreePool (Urb);\r
      return NULL;\r
    }\r
  }\r
  Urb->Data       = Data;\r
  Urb->DataLen    = DataLen;\r
  Urb->AllocateCommonBuffer = AllocateCommonBuffer;\r
  Urb->Callback   = Callback;\r
  Urb->Context    = Context;\r
\r
  PciIo           = Ehc->PciIo;\r
  Urb->Qh         = EhcCreateQh (Ehc, &Urb->Ep);\r
\r
  if (Urb->Qh == NULL) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Map the request and user data\r
  //\r
  if (Request != NULL) {\r
    Len     = sizeof (EFI_USB_DEVICE_REQUEST);\r
    MapOp   = EfiPciIoOperationBusMasterRead;\r
    Status  = PciIo->Map (PciIo, MapOp, Request, &Len, &PhyAddr, &Map);\r
\r
    if (EFI_ERROR (Status) || (Len != sizeof (EFI_USB_DEVICE_REQUEST))) {\r
      goto ON_ERROR;\r
    }\r
\r
    Urb->RequestPhy = (VOID *) ((UINTN) PhyAddr);\r
    Urb->RequestMap = Map;\r
  }\r
\r
  if (Data != NULL) {\r
    Len     = DataLen;\r
\r
    if (Urb->AllocateCommonBuffer) {\r
      MapOp = EfiPciIoOperationBusMasterCommonBuffer;\r
    } else {\r
      if (Ep->Direction == EfiUsbDataIn) {\r
        MapOp = EfiPciIoOperationBusMasterWrite;\r
      } else {\r
        MapOp = EfiPciIoOperationBusMasterRead;\r
      }\r
    }\r
\r
    Status  = PciIo->Map (PciIo, MapOp, Data, &Len, &PhyAddr, &Map);\r
\r
    if (EFI_ERROR (Status) || (Len != DataLen)) {\r
      goto ON_ERROR;\r
    }\r
\r
    Urb->DataPhy  = (VOID *) ((UINTN) PhyAddr);\r
    Urb->DataMap  = Map;\r
  }\r
\r
  Status = EhcCreateQtds (Ehc, Urb);\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  return Urb;\r
\r
ON_ERROR:\r
  EhcFreeUrb (Ehc, Urb);\r
  return NULL;\r
}\r