[USB] Update the names of new USB drivers
[reactos.git] / drivers / usb / usbehci / usbehci.c
diff --git a/drivers/usb/usbehci/usbehci.c b/drivers/usb/usbehci/usbehci.c
new file mode 100644 (file)
index 0000000..bdfd889
--- /dev/null
@@ -0,0 +1,3696 @@
+/*
+ * PROJECT:     ReactOS USB EHCI Miniport Driver
+ * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
+ * PURPOSE:     USBEHCI main driver functions
+ * COPYRIGHT:   Copyright 2017-2018 Vadim Galyant <vgal@rambler.ru>
+ */
+
+#include "usbehci.h"
+
+#define NDEBUG
+#include <debug.h>
+
+#define NDEBUG_EHCI_TRACE
+#include "dbg_ehci.h"
+
+USBPORT_REGISTRATION_PACKET RegPacket;
+
+static const UCHAR ClassicPeriod[8] = {
+    ENDPOINT_INTERRUPT_1ms - 1,
+    ENDPOINT_INTERRUPT_2ms - 1,
+    ENDPOINT_INTERRUPT_4ms - 1,
+    ENDPOINT_INTERRUPT_8ms - 1,
+    ENDPOINT_INTERRUPT_16ms - 1,
+    ENDPOINT_INTERRUPT_32ms - 1,
+    ENDPOINT_INTERRUPT_32ms - 1,
+    ENDPOINT_INTERRUPT_32ms - 1
+};
+
+static const EHCI_PERIOD pTable[] = {
+    { ENDPOINT_INTERRUPT_1ms, 0x00, 0xFF },
+    { ENDPOINT_INTERRUPT_2ms, 0x00, 0x55 },
+    { ENDPOINT_INTERRUPT_2ms, 0x00, 0xAA },
+    { ENDPOINT_INTERRUPT_4ms, 0x00, 0x11 },
+    { ENDPOINT_INTERRUPT_4ms, 0x00, 0x44 },
+    { ENDPOINT_INTERRUPT_4ms, 0x00, 0x22 },
+    { ENDPOINT_INTERRUPT_4ms, 0x00, 0x88 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x01 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x10 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x04 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x40 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x02 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x20 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x08 },
+    { ENDPOINT_INTERRUPT_8ms, 0x00, 0x80 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x01 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x01 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x10 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x10 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x04 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x04 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x40 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x40 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x02 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x02 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x20 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x20 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x08 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x08 },
+    { ENDPOINT_INTERRUPT_16ms, 0x01, 0x80 },
+    { ENDPOINT_INTERRUPT_16ms, 0x02, 0x80 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x01 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x01 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x01 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x01 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x10 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x10 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x10 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x10 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x04 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x04 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x04 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x04 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x40 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x40 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x40 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x40 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x02 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x02 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x02 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x02 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x20 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x20 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x20 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x20 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x08 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x08 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x08 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x08 },
+    { ENDPOINT_INTERRUPT_32ms, 0x03, 0x80 },
+    { ENDPOINT_INTERRUPT_32ms, 0x05, 0x80 },
+    { ENDPOINT_INTERRUPT_32ms, 0x04, 0x80 },
+    { ENDPOINT_INTERRUPT_32ms, 0x06, 0x80 },
+    { 0x00, 0x00, 0x00 }
+};
+C_ASSERT(RTL_NUMBER_OF(pTable) == INTERRUPT_ENDPOINTs + 1);
+
+static const UCHAR Balance[] = {
+    0, 16, 8, 24, 4, 20, 12, 28, 2, 18, 10, 26, 6, 22, 14, 30,
+    1, 17, 9, 25, 5, 21, 13, 29, 3, 19, 11, 27, 7, 23, 15, 31
+};
+C_ASSERT(RTL_NUMBER_OF(Balance) == EHCI_FRAMES);
+
+static const UCHAR LinkTable[] = {
+    255, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8,  9, 9,
+    10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19,
+    20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29,
+    30, 30, 0
+};
+C_ASSERT(RTL_NUMBER_OF(LinkTable) == INTERRUPT_ENDPOINTs + 1);
+
+PEHCI_HCD_TD
+NTAPI
+EHCI_AllocTd(IN PEHCI_EXTENSION EhciExtension,
+             IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_TD TD;
+    ULONG ix;
+
+    DPRINT_EHCI("EHCI_AllocTd: ... \n");
+
+    if (EhciEndpoint->MaxTDs == 0)
+    {
+        RegPacket.UsbPortBugCheck(EhciExtension);
+        return NULL;
+    }
+
+    TD = EhciEndpoint->FirstTD;
+
+    for (ix = 1; TD->TdFlags & EHCI_HCD_TD_FLAG_ALLOCATED; ix++)
+    {
+        TD += 1;
+
+        if (ix >= EhciEndpoint->MaxTDs)
+        {
+            RegPacket.UsbPortBugCheck(EhciExtension);
+            return NULL;
+        }
+    }
+
+    TD->TdFlags |= EHCI_HCD_TD_FLAG_ALLOCATED;
+
+    EhciEndpoint->RemainTDs--;
+
+    return TD;
+}
+
+PEHCI_HCD_QH
+NTAPI
+EHCI_InitializeQH(IN PEHCI_EXTENSION EhciExtension,
+                  IN PEHCI_ENDPOINT EhciEndpoint,
+                  IN PEHCI_HCD_QH QH,
+                  IN ULONG QhPA)
+{
+    PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties;
+    ULONG DeviceSpeed;
+
+    DPRINT_EHCI("EHCI_InitializeQH: EhciEndpoint - %p, QH - %p, QhPA - %p\n",
+                EhciEndpoint,
+                QH,
+                QhPA);
+
+    EndpointProperties = &EhciEndpoint->EndpointProperties;
+
+    RtlZeroMemory(QH, sizeof(EHCI_HCD_QH));
+
+    ASSERT((QhPA & ~LINK_POINTER_MASK) == 0);
+
+    QH->sqh.PhysicalAddress = QhPA;
+
+    QH->sqh.HwQH.EndpointParams.DeviceAddress = EndpointProperties->DeviceAddress;
+    QH->sqh.HwQH.EndpointParams.EndpointNumber = EndpointProperties->EndpointAddress;
+
+    DeviceSpeed = EndpointProperties->DeviceSpeed;
+
+    switch (DeviceSpeed)
+    {
+        case UsbLowSpeed:
+            QH->sqh.HwQH.EndpointParams.EndpointSpeed = EHCI_QH_EP_LOW_SPEED;
+            break;
+
+        case UsbFullSpeed:
+            QH->sqh.HwQH.EndpointParams.EndpointSpeed = EHCI_QH_EP_FULL_SPEED;
+            break;
+
+        case UsbHighSpeed:
+            QH->sqh.HwQH.EndpointParams.EndpointSpeed = EHCI_QH_EP_HIGH_SPEED;
+            break;
+
+        default:
+            DPRINT1("EHCI_InitializeQH: Unknown DeviceSpeed - %x\n", DeviceSpeed);
+            ASSERT(FALSE);
+            break;
+    }
+
+    QH->sqh.HwQH.EndpointParams.MaximumPacketLength = EndpointProperties->MaxPacketSize;
+    QH->sqh.HwQH.EndpointCaps.PipeMultiplier = 1;
+
+    if (DeviceSpeed == UsbHighSpeed)
+    {
+        QH->sqh.HwQH.EndpointCaps.HubAddr = 0;
+        QH->sqh.HwQH.EndpointCaps.PortNumber = 0;
+    }
+    else
+    {
+        QH->sqh.HwQH.EndpointCaps.HubAddr = EndpointProperties->HubAddr;
+        QH->sqh.HwQH.EndpointCaps.PortNumber = EndpointProperties->PortNumber;
+
+        if (EndpointProperties->TransferType == USBPORT_TRANSFER_TYPE_CONTROL)
+            QH->sqh.HwQH.EndpointParams.ControlEndpointFlag = 1;
+    }
+
+    QH->sqh.HwQH.NextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+
+    QH->sqh.HwQH.Token.Status &= (UCHAR)~(EHCI_TOKEN_STATUS_ACTIVE |
+                                          EHCI_TOKEN_STATUS_HALTED);
+
+    return QH;
+}
+
+MPSTATUS
+NTAPI
+EHCI_OpenBulkOrControlEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                               IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                               IN PEHCI_ENDPOINT EhciEndpoint,
+                               IN BOOLEAN IsControl)
+{
+    PEHCI_HCD_QH QH;
+    ULONG QhPA;
+    PEHCI_HCD_TD TdVA;
+    ULONG TdPA;
+    PEHCI_HCD_TD TD;
+    ULONG TdCount;
+    ULONG ix;
+
+    DPRINT("EHCI_OpenBulkOrControlEndpoint: EhciEndpoint - %p, IsControl - %x\n",
+           EhciEndpoint,
+           IsControl);
+
+    InitializeListHead(&EhciEndpoint->ListTDs);
+
+    EhciEndpoint->DmaBufferVA = (PVOID)EndpointProperties->BufferVA;
+    EhciEndpoint->DmaBufferPA = EndpointProperties->BufferPA;
+
+    RtlZeroMemory(EhciEndpoint->DmaBufferVA, sizeof(EHCI_HCD_TD));
+
+    QH = (PEHCI_HCD_QH)EhciEndpoint->DmaBufferVA + 1;
+    QhPA = EhciEndpoint->DmaBufferPA + sizeof(EHCI_HCD_TD);
+
+    EhciEndpoint->FirstTD = (PEHCI_HCD_TD)(QH + 1);
+
+    TdCount = (EndpointProperties->BufferLength -
+               (sizeof(EHCI_HCD_TD) + sizeof(EHCI_HCD_QH))) /
+               sizeof(EHCI_HCD_TD);
+
+    if (EndpointProperties->TransferType == USBPORT_TRANSFER_TYPE_CONTROL)
+        EhciEndpoint->EndpointStatus |= USBPORT_ENDPOINT_CONTROL;
+
+    EhciEndpoint->MaxTDs = TdCount;
+    EhciEndpoint->RemainTDs = TdCount;
+
+    TdVA = EhciEndpoint->FirstTD;
+    TdPA = QhPA + sizeof(EHCI_HCD_QH);
+
+    for (ix = 0; ix < TdCount; ix++)
+    {
+        DPRINT_EHCI("EHCI_OpenBulkOrControlEndpoint: TdVA - %p, TdPA - %p\n",
+                    TdVA,
+                    TdPA);
+
+        RtlZeroMemory(TdVA, sizeof(EHCI_HCD_TD));
+
+        ASSERT((TdPA & ~LINK_POINTER_MASK) == 0);
+
+        TdVA->PhysicalAddress = TdPA;
+        TdVA->EhciEndpoint = EhciEndpoint;
+        TdVA->EhciTransfer = NULL;
+
+        TdPA += sizeof(EHCI_HCD_TD);
+        TdVA += 1;
+    }
+
+    EhciEndpoint->QH = EHCI_InitializeQH(EhciExtension,
+                                         EhciEndpoint,
+                                         QH,
+                                         QhPA);
+
+    if (IsControl)
+    {
+        QH->sqh.HwQH.EndpointParams.DataToggleControl = 1;
+        EhciEndpoint->HcdHeadP = NULL;
+    }
+    else
+    {
+        QH->sqh.HwQH.EndpointParams.DataToggleControl = 0;
+    }
+
+    TD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+    if (!TD)
+        return MP_STATUS_NO_RESOURCES;
+
+    TD->TdFlags |= EHCI_HCD_TD_FLAG_DUMMY;
+    TD->HwTD.Token.Status &= (UCHAR)~EHCI_TOKEN_STATUS_ACTIVE;
+
+    TD->HwTD.NextTD = TERMINATE_POINTER;
+    TD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+    TD->NextHcdTD = NULL;
+    TD->AltNextHcdTD = NULL;
+
+    EhciEndpoint->HcdTailP = TD;
+    EhciEndpoint->HcdHeadP = TD;
+
+    QH->sqh.HwQH.CurrentTD = TD->PhysicalAddress;
+    QH->sqh.HwQH.NextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+
+    QH->sqh.HwQH.Token.Status &= (UCHAR)~EHCI_TOKEN_STATUS_ACTIVE;
+    QH->sqh.HwQH.Token.TransferBytes = 0;
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_OpenInterruptEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                           IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                           IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_QH QH;
+    ULONG QhPA;
+    PEHCI_HCD_TD FirstTD;
+    ULONG FirstTdPA;
+    PEHCI_HCD_TD TD;
+    PEHCI_HCD_TD DummyTD;
+    ULONG TdCount;
+    ULONG ix;
+    const EHCI_PERIOD * PeriodTable = NULL;
+    ULONG ScheduleOffset;
+    ULONG Idx = 0;
+    UCHAR Period;
+
+    DPRINT("EHCI_OpenInterruptEndpoint: EhciExtension - %p, EndpointProperties - %p, EhciEndpoint - %p\n",
+           EhciExtension,
+           EndpointProperties,
+           EhciEndpoint);
+
+    Period = EndpointProperties->Period;
+    ScheduleOffset = EndpointProperties->ScheduleOffset;
+
+    ASSERT(Period < (INTERRUPT_ENDPOINTs + 1));
+
+    while (!(Period & 1))
+    {
+        Idx++;
+        Period >>= 1;
+    }
+
+    ASSERT(Idx < 8);
+
+    InitializeListHead(&EhciEndpoint->ListTDs);
+
+    if (EhciEndpoint->EndpointProperties.DeviceSpeed == UsbHighSpeed)
+    {
+        PeriodTable = &pTable[ClassicPeriod[Idx] + ScheduleOffset];
+        EhciEndpoint->PeriodTable = PeriodTable;
+
+        DPRINT("EHCI_OpenInterruptEndpoint: EhciEndpoint - %p, ScheduleMask - %X, Index - %X\n",
+               EhciEndpoint,
+               PeriodTable->ScheduleMask,
+               ClassicPeriod[Idx]);
+
+        EhciEndpoint->StaticQH = EhciExtension->PeriodicHead[PeriodTable->PeriodIdx];
+    }
+    else
+    {
+        EhciEndpoint->PeriodTable = NULL;
+
+        DPRINT("EHCI_OpenInterruptEndpoint: EhciEndpoint - %p, Index - %X\n",
+               EhciEndpoint,
+               ClassicPeriod[Idx]);
+
+        EhciEndpoint->StaticQH = EhciExtension->PeriodicHead[ClassicPeriod[Idx] +
+                                                             ScheduleOffset];
+    }
+
+    EhciEndpoint->DmaBufferVA = (PVOID)EndpointProperties->BufferVA;
+    EhciEndpoint->DmaBufferPA = EndpointProperties->BufferPA;
+
+    RtlZeroMemory((PVOID)EndpointProperties->BufferVA, sizeof(EHCI_HCD_TD));
+
+    QH = (PEHCI_HCD_QH)(EndpointProperties->BufferVA + sizeof(EHCI_HCD_TD));
+    QhPA = EndpointProperties->BufferPA + sizeof(EHCI_HCD_TD);
+
+    FirstTD = (PEHCI_HCD_TD)(EndpointProperties->BufferVA +
+                             sizeof(EHCI_HCD_TD) +
+                             sizeof(EHCI_HCD_QH));
+
+    FirstTdPA = EndpointProperties->BufferPA +
+                sizeof(EHCI_HCD_TD) +
+                sizeof(EHCI_HCD_QH);
+
+    TdCount = (EndpointProperties->BufferLength -
+               (sizeof(EHCI_HCD_TD) + sizeof(EHCI_HCD_QH))) /
+               sizeof(EHCI_HCD_TD);
+
+    ASSERT(TdCount >= EHCI_MAX_INTERRUPT_TD_COUNT + 1);
+
+    EhciEndpoint->FirstTD = FirstTD;
+    EhciEndpoint->MaxTDs = TdCount;
+
+    for (ix = 0; ix < TdCount; ix++)
+    {
+        TD = EhciEndpoint->FirstTD + ix;
+
+        RtlZeroMemory(TD, sizeof(EHCI_HCD_TD));
+
+        ASSERT((FirstTdPA & ~LINK_POINTER_MASK) == 0);
+
+        TD->PhysicalAddress = FirstTdPA;
+        TD->EhciEndpoint = EhciEndpoint;
+        TD->EhciTransfer = NULL;
+
+        FirstTdPA += sizeof(EHCI_HCD_TD);
+    }
+
+    EhciEndpoint->RemainTDs = TdCount;
+
+    EhciEndpoint->QH = EHCI_InitializeQH(EhciExtension,
+                                         EhciEndpoint,
+                                         QH,
+                                         QhPA);
+
+    if (EhciEndpoint->EndpointProperties.DeviceSpeed == UsbHighSpeed)
+    {
+        QH->sqh.HwQH.EndpointCaps.InterruptMask = PeriodTable->ScheduleMask;
+    }
+    else
+    {
+        QH->sqh.HwQH.EndpointCaps.InterruptMask =
+        EndpointProperties->InterruptScheduleMask;
+
+        QH->sqh.HwQH.EndpointCaps.SplitCompletionMask =
+        EndpointProperties->SplitCompletionMask;
+    }
+
+    DummyTD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+    DummyTD->TdFlags |= EHCI_HCD_TD_FLAG_DUMMY;
+    DummyTD->NextHcdTD = NULL;
+    DummyTD->AltNextHcdTD = NULL;
+
+    DummyTD->HwTD.Token.Status &= ~EHCI_TOKEN_STATUS_ACTIVE;
+
+    DummyTD->HwTD.NextTD = TERMINATE_POINTER;
+    DummyTD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+    EhciEndpoint->HcdTailP = DummyTD;
+    EhciEndpoint->HcdHeadP = DummyTD;
+
+    QH->sqh.HwQH.CurrentTD = DummyTD->PhysicalAddress;
+    QH->sqh.HwQH.NextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+
+    QH->sqh.HwQH.Token.Status &= ~EHCI_TOKEN_STATUS_ACTIVE;
+    QH->sqh.HwQH.Token.TransferBytes = 0;
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_OpenHsIsoEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                       IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                       IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    DPRINT1("EHCI_OpenHsIsoEndpoint: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_NOT_SUPPORTED;
+}
+
+MPSTATUS
+NTAPI
+EHCI_OpenIsoEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                     IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                     IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    DPRINT1("EHCI_OpenIsoEndpoint: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_NOT_SUPPORTED;
+}
+
+MPSTATUS
+NTAPI
+EHCI_OpenEndpoint(IN PVOID ehciExtension,
+                  IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                  IN PVOID ehciEndpoint)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_ENDPOINT EhciEndpoint = ehciEndpoint;
+    ULONG TransferType;
+    MPSTATUS MPStatus;
+
+    DPRINT("EHCI_OpenEndpoint: ... \n");
+
+    RtlCopyMemory(&EhciEndpoint->EndpointProperties,
+                  EndpointProperties,
+                  sizeof(EhciEndpoint->EndpointProperties));
+
+    TransferType = EndpointProperties->TransferType;
+
+    switch (TransferType)
+    {
+        case USBPORT_TRANSFER_TYPE_ISOCHRONOUS:
+            if (EndpointProperties->DeviceSpeed == UsbHighSpeed)
+            {
+                MPStatus = EHCI_OpenHsIsoEndpoint(EhciExtension,
+                                                  EndpointProperties,
+                                                  EhciEndpoint);
+            }
+            else
+            {
+                MPStatus = EHCI_OpenIsoEndpoint(EhciExtension,
+                                                EndpointProperties,
+                                                EhciEndpoint);
+            }
+
+            break;
+
+        case USBPORT_TRANSFER_TYPE_CONTROL:
+            MPStatus = EHCI_OpenBulkOrControlEndpoint(EhciExtension,
+                                                      EndpointProperties,
+                                                      EhciEndpoint,
+                                                      TRUE);
+            break;
+
+        case USBPORT_TRANSFER_TYPE_BULK:
+            MPStatus = EHCI_OpenBulkOrControlEndpoint(EhciExtension,
+                                                      EndpointProperties,
+                                                      EhciEndpoint,
+                                                      FALSE);
+            break;
+
+        case USBPORT_TRANSFER_TYPE_INTERRUPT:
+            MPStatus = EHCI_OpenInterruptEndpoint(EhciExtension,
+                                                  EndpointProperties,
+                                                  EhciEndpoint);
+            break;
+
+        default:
+            MPStatus = MP_STATUS_NOT_SUPPORTED;
+            break;
+    }
+
+    return MPStatus;
+}
+
+MPSTATUS
+NTAPI
+EHCI_ReopenEndpoint(IN PVOID ehciExtension,
+                    IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                    IN PVOID ehciEndpoint)
+{
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG TransferType;
+    PEHCI_HCD_QH QH;
+    MPSTATUS MPStatus;
+
+    EhciEndpoint = ehciEndpoint;
+
+    TransferType = EndpointProperties->TransferType;
+
+    DPRINT("EHCI_ReopenEndpoint: EhciEndpoint - %p, TransferType - %x\n",
+           EhciEndpoint,
+           TransferType);
+
+    switch (TransferType)
+    {
+        case USBPORT_TRANSFER_TYPE_ISOCHRONOUS:
+            if (EndpointProperties->DeviceSpeed == UsbHighSpeed)
+            {
+                DPRINT1("EHCI_ReopenEndpoint: HS Iso. UNIMPLEMENTED. FIXME\n");
+                MPStatus = MP_STATUS_NOT_SUPPORTED;
+            }
+            else
+            {
+                DPRINT1("EHCI_ReopenEndpoint: Iso. UNIMPLEMENTED. FIXME\n");
+                MPStatus = MP_STATUS_NOT_SUPPORTED;
+            }
+
+            break;
+
+        case USBPORT_TRANSFER_TYPE_CONTROL:
+        case USBPORT_TRANSFER_TYPE_BULK:
+        case USBPORT_TRANSFER_TYPE_INTERRUPT:
+            RtlCopyMemory(&EhciEndpoint->EndpointProperties,
+                          EndpointProperties,
+                          sizeof(EhciEndpoint->EndpointProperties));
+
+            QH = EhciEndpoint->QH;
+
+            QH->sqh.HwQH.EndpointParams.DeviceAddress = EndpointProperties->DeviceAddress;
+            QH->sqh.HwQH.EndpointParams.MaximumPacketLength = EndpointProperties->MaxPacketSize;
+
+            QH->sqh.HwQH.EndpointCaps.HubAddr = EndpointProperties->HubAddr;
+
+            break;
+
+        default:
+            DPRINT1("EHCI_ReopenEndpoint: Unknown TransferType\n");
+            MPStatus = MP_STATUS_SUCCESS;
+            break;
+    }
+
+    return MPStatus;
+}
+
+VOID
+NTAPI
+EHCI_QueryEndpointRequirements(IN PVOID ehciExtension,
+                               IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                               IN PUSBPORT_ENDPOINT_REQUIREMENTS EndpointRequirements)
+{
+    ULONG TransferType;
+
+    DPRINT("EHCI_QueryEndpointRequirements: ... \n");
+
+    TransferType = EndpointProperties->TransferType;
+
+    switch (TransferType)
+    {
+        case USBPORT_TRANSFER_TYPE_ISOCHRONOUS:
+            DPRINT("EHCI_QueryEndpointRequirements: IsoTransfer\n");
+
+            if (EndpointProperties->DeviceSpeed == UsbHighSpeed)
+            {
+                EndpointRequirements->HeaderBufferSize = EHCI_MAX_HS_ISO_HEADER_BUFFER_SIZE;
+                EndpointRequirements->MaxTransferSize = EHCI_MAX_HS_ISO_TRANSFER_SIZE;
+            }
+            else
+            {
+                EndpointRequirements->HeaderBufferSize = EHCI_MAX_FS_ISO_HEADER_BUFFER_SIZE;
+                EndpointRequirements->MaxTransferSize = EHCI_MAX_FS_ISO_TRANSFER_SIZE;
+            }
+            break;
+
+        case USBPORT_TRANSFER_TYPE_CONTROL:
+            DPRINT("EHCI_QueryEndpointRequirements: ControlTransfer\n");
+            EndpointRequirements->HeaderBufferSize = sizeof(EHCI_HCD_TD) +
+                                                     sizeof(EHCI_HCD_QH) +
+                                                     EHCI_MAX_CONTROL_TD_COUNT * sizeof(EHCI_HCD_TD);
+
+            EndpointRequirements->MaxTransferSize = EHCI_MAX_CONTROL_TRANSFER_SIZE;
+            break;
+
+        case USBPORT_TRANSFER_TYPE_BULK:
+            DPRINT("EHCI_QueryEndpointRequirements: BulkTransfer\n");
+            EndpointRequirements->HeaderBufferSize = sizeof(EHCI_HCD_TD) +
+                                                     sizeof(EHCI_HCD_QH) +
+                                                     EHCI_MAX_BULK_TD_COUNT * sizeof(EHCI_HCD_TD);
+
+            EndpointRequirements->MaxTransferSize = EHCI_MAX_BULK_TRANSFER_SIZE;
+            break;
+
+        case USBPORT_TRANSFER_TYPE_INTERRUPT:
+            DPRINT("EHCI_QueryEndpointRequirements: InterruptTransfer\n");
+            EndpointRequirements->HeaderBufferSize = sizeof(EHCI_HCD_TD) +
+                                                     sizeof(EHCI_HCD_QH) +
+                                                     EHCI_MAX_INTERRUPT_TD_COUNT * sizeof(EHCI_HCD_TD);
+
+            EndpointRequirements->MaxTransferSize = EHCI_MAX_INTERRUPT_TRANSFER_SIZE;
+            break;
+
+        default:
+            DPRINT1("EHCI_QueryEndpointRequirements: Unknown TransferType - %x\n",
+                    TransferType);
+            DbgBreakPoint();
+            break;
+    }
+}
+
+VOID
+NTAPI
+EHCI_DisablePeriodicList(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+
+    DPRINT("EHCI_DisablePeriodicList: ... \n");
+
+    if (EhciExtension->Flags & EHCI_FLAGS_IDLE_SUPPORT)
+    {
+        OperationalRegs = EhciExtension->OperationalRegs;
+
+        Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+        Command.PeriodicEnable = 0;
+        WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+    }
+}
+
+VOID
+NTAPI
+EHCI_CloseEndpoint(IN PVOID ehciExtension,
+                   IN PVOID ehciEndpoint,
+                   IN BOOLEAN DisablePeriodic)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_ENDPOINT EhciEndpoint = ehciEndpoint;
+    ULONG TransferType;
+
+    DPRINT1("EHCI_CloseEndpoint: EhciEndpoint - %p, DisablePeriodic - %X\n",
+            EhciEndpoint,
+            DisablePeriodic);
+
+    if (DisablePeriodic)
+    {
+        TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+        if (TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS ||
+            TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+        {
+            EHCI_DisablePeriodicList(EhciExtension);
+        }
+    }
+}
+
+PEHCI_STATIC_QH
+NTAPI
+EHCI_GetQhForFrame(IN PEHCI_EXTENSION EhciExtension,
+                   IN ULONG FrameIdx)
+{
+    //DPRINT_EHCI("EHCI_GetQhForFrame: FrameIdx - %x, Balance[FrameIdx] - %x\n",
+    //            FrameIdx,
+    //            Balance[FrameIdx & 0x1F]);
+
+    return EhciExtension->PeriodicHead[Balance[FrameIdx & (EHCI_FRAMES - 1)]];
+}
+
+PEHCI_HCD_QH
+NTAPI
+EHCI_GetDummyQhForFrame(IN PEHCI_EXTENSION EhciExtension,
+                        IN ULONG Idx)
+{
+    return (PEHCI_HCD_QH)((ULONG_PTR)EhciExtension->IsoDummyQHListVA +
+                          Idx * sizeof(EHCI_HCD_QH));
+}
+
+VOID
+NTAPI
+EHCI_AlignHwStructure(IN PEHCI_EXTENSION EhciExtension,
+                      IN PULONG PhysicalAddress,
+                      IN PULONG_PTR VirtualAddress,
+                      IN ULONG Alignment)
+{
+    ULONG PAddress;
+    ULONG NewPAddress;
+    ULONG_PTR VAddress;
+
+    //DPRINT_EHCI("EHCI_AlignHwStructure: *PhysicalAddress - %X, *VirtualAddress - %X, Alignment - %x\n",
+    //             *PhysicalAddress,
+    //             *VirtualAddress,
+    //             Alignment);
+
+    PAddress = *PhysicalAddress;
+    VAddress = *VirtualAddress;
+
+    NewPAddress = (ULONG)(ULONG_PTR)PAGE_ALIGN(*PhysicalAddress + Alignment - 1);
+
+    if (NewPAddress != (ULONG)(ULONG_PTR)PAGE_ALIGN(*PhysicalAddress))
+    {
+        VAddress += NewPAddress - PAddress;
+        PAddress = NewPAddress;
+
+        DPRINT("EHCI_AlignHwStructure: VAddress - %X, PAddress - %X\n",
+               VAddress,
+               PAddress);
+    }
+
+    *VirtualAddress = VAddress;
+    *PhysicalAddress = PAddress;
+}
+
+VOID
+NTAPI
+EHCI_AddDummyQHs(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HC_RESOURCES HcResourcesVA;
+    PEHCI_HCD_QH DummyQH;
+    ULONG DummyQhPA;
+    EHCI_QH_EP_PARAMS EndpointParams;
+    EHCI_LINK_POINTER PAddress;
+    ULONG Frame;
+
+    DPRINT("EHCI_AddDummyQueueHeads: EhciExtension - %p\n", EhciExtension);
+
+    HcResourcesVA = EhciExtension->HcResourcesVA;
+
+    DummyQH = EhciExtension->IsoDummyQHListVA;
+    DummyQhPA = EhciExtension->IsoDummyQHListPA;
+
+    for (Frame = 0; Frame < EHCI_FRAME_LIST_MAX_ENTRIES; Frame++)
+    {
+        RtlZeroMemory(DummyQH, sizeof(EHCI_HCD_QH));
+
+        PAddress.AsULONG = HcResourcesVA->PeriodicFrameList[Frame];
+
+        DummyQH->sqh.HwQH.HorizontalLink.AsULONG = PAddress.AsULONG;
+        DummyQH->sqh.HwQH.CurrentTD = 0;
+        DummyQH->sqh.HwQH.NextTD = TERMINATE_POINTER;
+        DummyQH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+
+        EndpointParams = DummyQH->sqh.HwQH.EndpointParams;
+        EndpointParams.DeviceAddress = 0;
+        EndpointParams.EndpointSpeed = 0;
+        EndpointParams.MaximumPacketLength = EHCI_DUMMYQH_MAX_PACKET_LENGTH;
+        DummyQH->sqh.HwQH.EndpointParams = EndpointParams;
+
+        DummyQH->sqh.HwQH.EndpointCaps.AsULONG = 0;
+        DummyQH->sqh.HwQH.EndpointCaps.InterruptMask = 0;
+        DummyQH->sqh.HwQH.EndpointCaps.SplitCompletionMask = 0;
+        DummyQH->sqh.HwQH.EndpointCaps.PipeMultiplier = 1;
+
+        DummyQH->sqh.HwQH.Token.Status &= (UCHAR)~EHCI_TOKEN_STATUS_ACTIVE;
+
+        DummyQH->sqh.PhysicalAddress = DummyQhPA;
+        DummyQH->sqh.StaticQH = EHCI_GetQhForFrame(EhciExtension, Frame);
+
+        PAddress.AsULONG = DummyQhPA;
+        PAddress.Reserved = 0;
+        PAddress.Type = EHCI_LINK_TYPE_QH;
+
+        HcResourcesVA->PeriodicFrameList[Frame] = PAddress.AsULONG;
+
+        DummyQH++;
+        DummyQhPA += sizeof(EHCI_HCD_QH);
+    }
+}
+
+VOID
+NTAPI
+EHCI_InitializeInterruptSchedule(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_STATIC_QH StaticQH;
+    ULONG ix;
+
+    DPRINT("EHCI_InitializeInterruptSchedule: ... \n");
+
+    for (ix = 0; ix < INTERRUPT_ENDPOINTs; ix++)
+    {
+        StaticQH = EhciExtension->PeriodicHead[ix];
+
+        StaticQH->HwQH.EndpointParams.HeadReclamationListFlag = 0;
+        StaticQH->HwQH.NextTD |= TERMINATE_POINTER;
+        StaticQH->HwQH.Token.Status |= (UCHAR)EHCI_TOKEN_STATUS_HALTED;
+    }
+
+    for (ix = 1; ix < INTERRUPT_ENDPOINTs; ix++)
+    {
+        StaticQH = EhciExtension->PeriodicHead[ix];
+
+        StaticQH->PrevHead = NULL;
+        StaticQH->NextHead = (PEHCI_HCD_QH)EhciExtension->PeriodicHead[LinkTable[ix]];
+
+        StaticQH->HwQH.HorizontalLink.AsULONG =
+            EhciExtension->PeriodicHead[LinkTable[ix]]->PhysicalAddress;
+
+        StaticQH->HwQH.HorizontalLink.Type = EHCI_LINK_TYPE_QH;
+        StaticQH->HwQH.EndpointCaps.InterruptMask = 0xFF;
+
+        StaticQH->QhFlags |= EHCI_QH_FLAG_STATIC;
+
+        if (ix < (ENDPOINT_INTERRUPT_8ms - 1))
+            StaticQH->QhFlags |= EHCI_QH_FLAG_STATIC_FAST;
+    }
+
+    EhciExtension->PeriodicHead[0]->HwQH.HorizontalLink.Terminate = 1;
+
+    EhciExtension->PeriodicHead[0]->QhFlags |= (EHCI_QH_FLAG_STATIC |
+                                                EHCI_QH_FLAG_STATIC_FAST);
+}
+
+MPSTATUS
+NTAPI
+EHCI_InitializeSchedule(IN PEHCI_EXTENSION EhciExtension,
+                        IN ULONG_PTR BaseVA,
+                        IN ULONG BasePA)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    PEHCI_HC_RESOURCES HcResourcesVA;
+    ULONG HcResourcesPA;
+    PEHCI_STATIC_QH AsyncHead;
+    ULONG AsyncHeadPA;
+    PEHCI_STATIC_QH PeriodicHead;
+    ULONG PeriodicHeadPA;
+    PEHCI_STATIC_QH StaticQH;
+    EHCI_LINK_POINTER NextLink;
+    EHCI_LINK_POINTER StaticHeadPA;
+    ULONG Frame;
+    ULONG ix;
+
+    DPRINT("EHCI_InitializeSchedule: BaseVA - %p, BasePA - %p\n",
+           BaseVA,
+           BasePA);
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    HcResourcesVA = (PEHCI_HC_RESOURCES)BaseVA;
+    HcResourcesPA = BasePA;
+
+    EhciExtension->HcResourcesVA = HcResourcesVA;
+    EhciExtension->HcResourcesPA = BasePA;
+
+    /* Asynchronous Schedule */
+
+    AsyncHead = &HcResourcesVA->AsyncHead;
+    AsyncHeadPA = HcResourcesPA + FIELD_OFFSET(EHCI_HC_RESOURCES, AsyncHead);
+
+    RtlZeroMemory(AsyncHead, sizeof(EHCI_STATIC_QH));
+
+    NextLink.AsULONG = AsyncHeadPA;
+    NextLink.Type = EHCI_LINK_TYPE_QH;
+
+    AsyncHead->HwQH.HorizontalLink = NextLink;
+    AsyncHead->HwQH.EndpointParams.HeadReclamationListFlag = 1;
+    AsyncHead->HwQH.EndpointCaps.PipeMultiplier = 1;
+    AsyncHead->HwQH.NextTD |= TERMINATE_POINTER;
+    AsyncHead->HwQH.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_HALTED;
+
+    AsyncHead->PhysicalAddress = AsyncHeadPA;
+    AsyncHead->PrevHead = AsyncHead->NextHead = (PEHCI_HCD_QH)AsyncHead;
+
+    EhciExtension->AsyncHead = AsyncHead;
+
+    /* Periodic Schedule */
+
+    PeriodicHead = &HcResourcesVA->PeriodicHead[0];
+    PeriodicHeadPA = HcResourcesPA + FIELD_OFFSET(EHCI_HC_RESOURCES, PeriodicHead[0]);
+
+    for (ix = 0; ix < (INTERRUPT_ENDPOINTs + 1); ix++)
+    {
+        EHCI_AlignHwStructure(EhciExtension,
+                              &PeriodicHeadPA,
+                              (PULONG_PTR)&PeriodicHead,
+                              80);
+
+        EhciExtension->PeriodicHead[ix] = PeriodicHead;
+        EhciExtension->PeriodicHead[ix]->PhysicalAddress = PeriodicHeadPA;
+
+        PeriodicHead += 1;
+        PeriodicHeadPA += sizeof(EHCI_STATIC_QH);
+    }
+
+    EHCI_InitializeInterruptSchedule(EhciExtension);
+
+    for (Frame = 0; Frame < EHCI_FRAME_LIST_MAX_ENTRIES; Frame++)
+    {
+        StaticQH = EHCI_GetQhForFrame(EhciExtension, Frame);
+
+        StaticHeadPA.AsULONG = StaticQH->PhysicalAddress;
+        StaticHeadPA.Type = EHCI_LINK_TYPE_QH;
+
+        //DPRINT_EHCI("EHCI_InitializeSchedule: StaticHeadPA[%x] - %X\n",
+        //            Frame,
+        //            StaticHeadPA);
+
+        HcResourcesVA->PeriodicFrameList[Frame] = StaticHeadPA.AsULONG;
+    }
+
+    EhciExtension->IsoDummyQHListVA = &HcResourcesVA->IsoDummyQH[0];
+    EhciExtension->IsoDummyQHListPA = HcResourcesPA + FIELD_OFFSET(EHCI_HC_RESOURCES, IsoDummyQH[0]);
+
+    EHCI_AddDummyQHs(EhciExtension);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->PeriodicListBase,
+                         EhciExtension->HcResourcesPA + FIELD_OFFSET(EHCI_HC_RESOURCES, PeriodicFrameList));
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->AsyncListBase,
+                         NextLink.AsULONG);
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_InitializeHardware(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HC_CAPABILITY_REGISTERS CapabilityRegisters;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+    LARGE_INTEGER EndTime;
+    LARGE_INTEGER CurrentTime;
+    EHCI_HC_STRUCTURAL_PARAMS StructuralParams;
+
+    DPRINT("EHCI_InitializeHardware: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+    CapabilityRegisters = EhciExtension->CapabilityRegisters;
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.Reset = 1;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    KeQuerySystemTime(&EndTime);
+    EndTime.QuadPart += 100 * 10000; // 100 msec
+
+    DPRINT("EHCI_InitializeHardware: Start reset ... \n");
+
+    while (TRUE)
+    {
+        KeQuerySystemTime(&CurrentTime);
+        Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+
+        if (Command.Reset != 1)
+            break;
+
+        if (CurrentTime.QuadPart >= EndTime.QuadPart)
+        {
+            if (Command.Reset == 1)
+            {
+                DPRINT1("EHCI_InitializeHardware: Reset failed!\n");
+                return MP_STATUS_HW_ERROR;
+            }
+
+            break;
+        }
+    }
+
+    DPRINT("EHCI_InitializeHardware: Reset - OK\n");
+
+    StructuralParams.AsULONG = READ_REGISTER_ULONG(&CapabilityRegisters->StructParameters.AsULONG);
+
+    EhciExtension->NumberOfPorts = StructuralParams.PortCount;
+    EhciExtension->PortPowerControl = StructuralParams.PortPowerControl;
+
+    DPRINT("EHCI_InitializeHardware: StructuralParams - %X\n", StructuralParams.AsULONG);
+    DPRINT("EHCI_InitializeHardware: PortPowerControl - %x\n", EhciExtension->PortPowerControl);
+    DPRINT("EHCI_InitializeHardware: N_PORTS          - %x\n", EhciExtension->NumberOfPorts);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->PeriodicListBase, 0);
+    WRITE_REGISTER_ULONG(&OperationalRegs->AsyncListBase, 0);
+
+    EhciExtension->InterruptMask.AsULONG = 0;
+    EhciExtension->InterruptMask.Interrupt = 1;
+    EhciExtension->InterruptMask.ErrorInterrupt = 1;
+    EhciExtension->InterruptMask.PortChangeInterrupt = 0;
+    EhciExtension->InterruptMask.FrameListRollover = 1;
+    EhciExtension->InterruptMask.HostSystemError = 1;
+    EhciExtension->InterruptMask.InterruptOnAsyncAdvance = 1;
+
+    return MP_STATUS_SUCCESS;
+}
+
+UCHAR
+NTAPI
+EHCI_GetOffsetEECP(IN PEHCI_EXTENSION EhciExtension,
+                   IN UCHAR CapabilityID)
+{
+    EHCI_LEGACY_EXTENDED_CAPABILITY LegacyCapability;
+    EHCI_HC_CAPABILITY_PARAMS CapParameters;
+    UCHAR OffsetEECP;
+
+    DPRINT("EHCI_GetOffsetEECP: CapabilityID - %x\n", CapabilityID);
+
+    CapParameters = EhciExtension->CapabilityRegisters->CapParameters;
+
+    OffsetEECP = CapParameters.ExtCapabilitiesPointer;
+
+    if (!OffsetEECP)
+        return 0;
+
+    while (TRUE)
+    {
+        RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                              TRUE,
+                                              &LegacyCapability.AsULONG,
+                                              OffsetEECP,
+                                              sizeof(LegacyCapability));
+
+        DPRINT("EHCI_GetOffsetEECP: OffsetEECP - %x\n", OffsetEECP);
+
+        if (LegacyCapability.CapabilityID == CapabilityID)
+            break;
+
+        OffsetEECP = LegacyCapability.NextCapabilityPointer;
+
+        if (!OffsetEECP)
+            return 0;
+    }
+
+    return OffsetEECP;
+}
+
+MPSTATUS
+NTAPI
+EHCI_TakeControlHC(IN PEHCI_EXTENSION EhciExtension)
+{
+    LARGE_INTEGER EndTime;
+    LARGE_INTEGER CurrentTime;
+    EHCI_LEGACY_EXTENDED_CAPABILITY LegacyCapability;
+    UCHAR OffsetEECP;
+
+    DPRINT("EHCI_TakeControlHC: EhciExtension - %p\n", EhciExtension);
+
+    OffsetEECP = EHCI_GetOffsetEECP(EhciExtension, 1);
+
+    if (OffsetEECP == 0)
+        return MP_STATUS_SUCCESS;
+
+    DPRINT("EHCI_TakeControlHC: OffsetEECP - %X\n", OffsetEECP);
+
+    RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                          TRUE,
+                                          &LegacyCapability.AsULONG,
+                                          OffsetEECP,
+                                          sizeof(LegacyCapability));
+
+    if (LegacyCapability.BiosOwnedSemaphore == 0)
+        return MP_STATUS_SUCCESS;
+
+    LegacyCapability.OsOwnedSemaphore = 1;
+
+    RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                          FALSE,
+                                          &LegacyCapability.AsULONG,
+                                          OffsetEECP,
+                                          sizeof(LegacyCapability));
+
+    KeQuerySystemTime(&EndTime);
+    EndTime.QuadPart += 100 * 10000;
+
+    do
+    {
+        RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                              TRUE,
+                                              &LegacyCapability.AsULONG,
+                                              OffsetEECP,
+                                              sizeof(LegacyCapability));
+        KeQuerySystemTime(&CurrentTime);
+
+        if (LegacyCapability.BiosOwnedSemaphore)
+        {
+            DPRINT("EHCI_TakeControlHC: Ownership is ok\n");
+            break;
+        }
+    }
+    while (CurrentTime.QuadPart <= EndTime.QuadPart);
+
+    return MP_STATUS_SUCCESS;
+}
+
+VOID
+NTAPI
+EHCI_GetRegistryParameters(IN PEHCI_EXTENSION EhciExtension)
+{
+    DPRINT1("EHCI_GetRegistryParameters: UNIMPLEMENTED. FIXME\n");
+}
+
+MPSTATUS
+NTAPI
+EHCI_StartController(IN PVOID ehciExtension,
+                     IN PUSBPORT_RESOURCES Resources)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HC_CAPABILITY_REGISTERS CapabilityRegisters;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    MPSTATUS MPStatus;
+    EHCI_USB_COMMAND Command;
+    UCHAR CapabilityRegLength;
+    UCHAR Fladj;
+
+    DPRINT("EHCI_StartController: ... \n");
+
+    if ((Resources->ResourcesTypes & (USBPORT_RESOURCES_MEMORY | USBPORT_RESOURCES_INTERRUPT)) !=
+                                     (USBPORT_RESOURCES_MEMORY | USBPORT_RESOURCES_INTERRUPT))
+    {
+        DPRINT1("EHCI_StartController: Resources->ResourcesTypes - %x\n",
+                Resources->ResourcesTypes);
+
+        return MP_STATUS_ERROR;
+    }
+
+    CapabilityRegisters = (PEHCI_HC_CAPABILITY_REGISTERS)Resources->ResourceBase;
+    EhciExtension->CapabilityRegisters = CapabilityRegisters;
+
+    CapabilityRegLength = READ_REGISTER_UCHAR(&CapabilityRegisters->RegistersLength);
+
+    OperationalRegs = (PEHCI_HW_REGISTERS)((ULONG_PTR)CapabilityRegisters +
+                                                      CapabilityRegLength);
+
+    EhciExtension->OperationalRegs = OperationalRegs;
+
+    DPRINT("EHCI_StartController: CapabilityRegisters - %p\n", CapabilityRegisters);
+    DPRINT("EHCI_StartController: OperationalRegs     - %p\n", OperationalRegs);
+
+    RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                          TRUE,
+                                          &Fladj,
+                                          EHCI_FLADJ_PCI_CONFIG_OFFSET,
+                                          sizeof(Fladj));
+
+    EhciExtension->FrameLengthAdjustment = Fladj;
+
+    EHCI_GetRegistryParameters(EhciExtension);
+
+    MPStatus = EHCI_TakeControlHC(EhciExtension);
+
+    if (MPStatus)
+    {
+        DPRINT1("EHCI_StartController: Unsuccessful TakeControlHC()\n");
+        return MPStatus;
+    }
+
+    MPStatus = EHCI_InitializeHardware(EhciExtension);
+
+    if (MPStatus)
+    {
+        DPRINT1("EHCI_StartController: Unsuccessful InitializeHardware()\n");
+        return MPStatus;
+    }
+
+    MPStatus = EHCI_InitializeSchedule(EhciExtension,
+                                       Resources->StartVA,
+                                       Resources->StartPA);
+
+    if (MPStatus)
+    {
+        DPRINT1("EHCI_StartController: Unsuccessful InitializeSchedule()\n");
+        return MPStatus;
+    }
+
+    RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                          TRUE,
+                                          &Fladj,
+                                          EHCI_FLADJ_PCI_CONFIG_OFFSET,
+                                          sizeof(Fladj));
+
+    if (Fladj != EhciExtension->FrameLengthAdjustment)
+    {
+        Fladj = EhciExtension->FrameLengthAdjustment;
+
+        RegPacket.UsbPortReadWriteConfigSpace(EhciExtension,
+                                              FALSE, // write
+                                              &Fladj,
+                                              EHCI_FLADJ_PCI_CONFIG_OFFSET,
+                                              sizeof(Fladj));
+    }
+
+    /* Port routing control logic default-routes all ports to this HC */
+    EhciExtension->PortRoutingControl = EHCI_CONFIG_FLAG_CONFIGURED;
+    WRITE_REGISTER_ULONG(&OperationalRegs->ConfigFlag,
+                         EhciExtension->PortRoutingControl);
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.InterruptThreshold = 1; // one micro-frame
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.Run = 1; // execution of the schedule
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    EhciExtension->IsStarted = TRUE;
+
+    if (Resources->IsChirpHandled)
+    {
+        ULONG Port;
+
+        for (Port = 1; Port <= EhciExtension->NumberOfPorts; Port++)
+        {
+            EHCI_RH_SetFeaturePortPower(EhciExtension, Port);
+        }
+
+        RegPacket.UsbPortWait(EhciExtension, 200);
+
+        for (Port = 1; Port <= EhciExtension->NumberOfPorts; Port++)
+        {
+            EHCI_RH_ChirpRootPort(EhciExtension, Port++);
+        }
+    }
+
+    return MPStatus;
+}
+
+VOID
+NTAPI
+EHCI_StopController(IN PVOID ehciExtension,
+                    IN BOOLEAN DisableInterrupts)
+{
+    DPRINT1("EHCI_StopController: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_SuspendController(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+    EHCI_USB_STATUS Status;
+    EHCI_INTERRUPT_ENABLE IntrEn;
+    ULONG ix;
+
+    DPRINT("EHCI_SuspendController: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    EhciExtension->BackupPeriodiclistbase = READ_REGISTER_ULONG(&OperationalRegs->PeriodicListBase);
+    EhciExtension->BackupAsynclistaddr = READ_REGISTER_ULONG(&OperationalRegs->AsyncListBase);
+    EhciExtension->BackupCtrlDSSegment = READ_REGISTER_ULONG(&OperationalRegs->SegmentSelector);
+    EhciExtension->BackupUSBCmd = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.InterruptAdvanceDoorbell = 0;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.Run = 0;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    KeStallExecutionProcessor(125);
+
+    Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+
+    Status.HCHalted = 0;
+    Status.Reclamation = 0;
+    Status.PeriodicStatus = 0;
+    Status.AsynchronousStatus = 0;
+
+    if (Status.AsULONG)
+        WRITE_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG, Status.AsULONG);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG, 0);
+
+    for (ix = 0; ix < 10; ix++)
+    {
+        Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+
+        if (Status.HCHalted)
+            break;
+
+        RegPacket.UsbPortWait(EhciExtension, 1);
+    }
+
+    if (!Status.HCHalted)
+        DbgBreakPoint();
+
+    IntrEn.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG);
+    IntrEn.PortChangeInterrupt = 1;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG, IntrEn.AsULONG);
+
+    EhciExtension->Flags |= EHCI_FLAGS_CONTROLLER_SUSPEND;
+}
+
+MPSTATUS
+NTAPI
+EHCI_ResumeController(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    ULONG RoutingControl;
+    EHCI_USB_COMMAND Command;
+
+    DPRINT("EHCI_ResumeController: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    RoutingControl = EhciExtension->PortRoutingControl;
+
+    if (!(RoutingControl & EHCI_CONFIG_FLAG_CONFIGURED))
+    {
+        EhciExtension->PortRoutingControl = RoutingControl | EHCI_CONFIG_FLAG_CONFIGURED;
+        WRITE_REGISTER_ULONG(&OperationalRegs->ConfigFlag,
+                             EhciExtension->PortRoutingControl);
+
+        return MP_STATUS_HW_ERROR;
+    }
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->SegmentSelector,
+                         EhciExtension->BackupCtrlDSSegment);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->PeriodicListBase,
+                         EhciExtension->BackupPeriodiclistbase);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->AsyncListBase,
+                         EhciExtension->BackupAsynclistaddr);
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+
+    Command.AsULONG = Command.AsULONG ^ EhciExtension->BackupUSBCmd;
+
+    Command.Reset = 0;
+    Command.FrameListSize = 0;
+    Command.InterruptAdvanceDoorbell = 0;
+    Command.LightResetHC = 0;
+    Command.AsynchronousParkModeCount = 0;
+    Command.AsynchronousParkModeEnable = 0;
+
+    Command.Run = 1;
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG,
+                         Command.AsULONG);
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG,
+                         EhciExtension->InterruptMask.AsULONG);
+
+    EhciExtension->Flags &= ~EHCI_FLAGS_CONTROLLER_SUSPEND;
+
+    return MP_STATUS_SUCCESS;
+}
+
+BOOLEAN
+NTAPI
+EHCI_HardwarePresent(IN PEHCI_EXTENSION EhciExtension,
+                     IN BOOLEAN IsInvalidateController)
+{
+    PEHCI_HW_REGISTERS OperationalRegs = EhciExtension->OperationalRegs;
+
+    if (READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG) != -1)
+        return TRUE;
+
+    DPRINT1("EHCI_HardwarePresent: IsInvalidateController - %x\n",
+            IsInvalidateController);
+
+    if (!IsInvalidateController)
+        return FALSE;
+
+    RegPacket.UsbPortInvalidateController(EhciExtension,
+                                          USBPORT_INVALIDATE_CONTROLLER_SURPRISE_REMOVE);
+    return FALSE;
+}
+
+BOOLEAN
+NTAPI
+EHCI_InterruptService(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    BOOLEAN Result = FALSE;
+    EHCI_USB_STATUS IntrSts;
+    EHCI_INTERRUPT_ENABLE IntrEn;
+    EHCI_INTERRUPT_ENABLE iStatus;
+    EHCI_USB_COMMAND Command;
+    ULONG FrameIndex;
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    DPRINT_EHCI("EHCI_InterruptService: ... \n");
+
+    Result = EHCI_HardwarePresent(EhciExtension, FALSE);
+
+    if (!Result)
+        return FALSE;
+
+    IntrEn.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG);
+    IntrSts.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+
+    iStatus.AsULONG = (IntrEn.AsULONG & IntrSts.AsULONG) & EHCI_INTERRUPT_MASK;
+
+    if (!iStatus.AsULONG)
+        return FALSE;
+
+    EhciExtension->InterruptStatus = iStatus;
+
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG, iStatus.AsULONG);
+
+    if (iStatus.HostSystemError)
+    {
+        EhciExtension->HcSystemErrors++;
+
+        if (EhciExtension->HcSystemErrors < EHCI_MAX_HC_SYSTEM_ERRORS)
+        {
+            Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+            Command.Run = 1;
+            WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+        }
+    }
+
+    FrameIndex = READ_REGISTER_ULONG(&OperationalRegs->FrameIndex) / EHCI_MICROFRAMES;
+    FrameIndex &= EHCI_FRINDEX_FRAME_MASK;
+
+    if ((FrameIndex ^ EhciExtension->FrameIndex) & EHCI_FRAME_LIST_MAX_ENTRIES)
+    {
+        EhciExtension->FrameHighPart += 2 * EHCI_FRAME_LIST_MAX_ENTRIES;
+
+        EhciExtension->FrameHighPart -= (FrameIndex ^ EhciExtension->FrameHighPart) &
+                                        EHCI_FRAME_LIST_MAX_ENTRIES;
+    }
+
+    EhciExtension->FrameIndex = FrameIndex;
+
+    return TRUE;
+}
+
+VOID
+NTAPI
+EHCI_InterruptDpc(IN PVOID ehciExtension,
+                  IN BOOLEAN EnableInterrupts)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_INTERRUPT_ENABLE iStatus;
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    DPRINT_EHCI("EHCI_InterruptDpc: [%p] EnableInterrupts - %x\n",
+                EhciExtension, EnableInterrupts);
+
+    iStatus = EhciExtension->InterruptStatus;
+    EhciExtension->InterruptStatus.AsULONG = 0;
+
+    if (iStatus.Interrupt == 1 ||
+        iStatus.ErrorInterrupt == 1 ||
+        iStatus.InterruptOnAsyncAdvance == 1)
+    {
+        DPRINT_EHCI("EHCI_InterruptDpc: [%p] InterruptStatus - %X\n", EhciExtension, iStatus.AsULONG);
+        RegPacket.UsbPortInvalidateEndpoint(EhciExtension, NULL);
+    }
+
+    if (iStatus.PortChangeInterrupt == 1)
+    {
+        DPRINT_EHCI("EHCI_InterruptDpc: [%p] PortChangeInterrupt\n", EhciExtension);
+        RegPacket.UsbPortInvalidateRootHub(EhciExtension);
+    }
+
+    if (EnableInterrupts)
+    {
+        WRITE_REGISTER_ULONG(&OperationalRegs->HcInterruptEnable.AsULONG,
+                             EhciExtension->InterruptMask.AsULONG);
+    }
+}
+
+ULONG
+NTAPI
+EHCI_MapAsyncTransferToTd(IN PEHCI_EXTENSION EhciExtension,
+                          IN ULONG MaxPacketSize,
+                          IN ULONG TransferedLen,
+                          IN PULONG DataToggle,
+                          IN PEHCI_TRANSFER EhciTransfer,
+                          IN PEHCI_HCD_TD TD,
+                          IN PUSBPORT_SCATTER_GATHER_LIST SgList)
+{
+    PUSBPORT_TRANSFER_PARAMETERS TransferParameters;
+    PUSBPORT_SCATTER_GATHER_ELEMENT SgElement;
+    ULONG SgIdx;
+    ULONG LengthThisTD;
+    ULONG ix;
+    ULONG SgRemain;
+    ULONG DiffLength;
+    ULONG NumPackets;
+
+    DPRINT_EHCI("EHCI_MapAsyncTransferToTd: EhciTransfer - %p, TD - %p, TransferedLen - %x, MaxPacketSize - %x, DataToggle - %x\n",
+                EhciTransfer,
+                TD,
+                TransferedLen,
+                MaxPacketSize,
+                DataToggle);
+
+    TransferParameters = EhciTransfer->TransferParameters;
+
+    SgElement = &SgList->SgElement[0];
+
+    for (SgIdx = 0; SgIdx < SgList->SgElementCount; SgIdx++)
+    {
+        if (TransferedLen >= SgElement->SgOffset &&
+            TransferedLen < SgElement->SgOffset + SgElement->SgTransferLength)
+        {
+            break;
+        }
+
+        SgElement += 1;
+    }
+
+    SgRemain = SgList->SgElementCount - SgIdx;
+
+    if (SgRemain > EHCI_MAX_QTD_BUFFER_PAGES)
+    {
+        TD->HwTD.Buffer[0] = SgList->SgElement[SgIdx].SgPhysicalAddress.LowPart -
+                             SgList->SgElement[SgIdx].SgOffset +
+                             TransferedLen;
+
+        LengthThisTD = EHCI_MAX_QTD_BUFFER_PAGES * PAGE_SIZE -
+                       (TD->HwTD.Buffer[0] & (PAGE_SIZE - 1));
+
+        for (ix = 1; ix < EHCI_MAX_QTD_BUFFER_PAGES; ix++)
+        {
+            TD->HwTD.Buffer[ix] = SgList->SgElement[SgIdx + ix].SgPhysicalAddress.LowPart;
+        }
+
+        NumPackets = LengthThisTD / MaxPacketSize;
+        DiffLength = LengthThisTD - MaxPacketSize * (LengthThisTD / MaxPacketSize);
+
+        if (LengthThisTD != MaxPacketSize * (LengthThisTD / MaxPacketSize))
+            LengthThisTD -= DiffLength;
+
+        if (DataToggle && (NumPackets & 1))
+            *DataToggle = !(*DataToggle);
+    }
+    else
+    {
+        LengthThisTD = TransferParameters->TransferBufferLength - TransferedLen;
+
+        TD->HwTD.Buffer[0] = TransferedLen +
+                             SgList->SgElement[SgIdx].SgPhysicalAddress.LowPart -
+                             SgList->SgElement[SgIdx].SgOffset;
+
+        for (ix = 1; ix < EHCI_MAX_QTD_BUFFER_PAGES; ix++)
+        {
+            if ((SgIdx + ix) >= SgList->SgElementCount)
+                break;
+
+            TD->HwTD.Buffer[ix] = SgList->SgElement[SgIdx + ix].SgPhysicalAddress.LowPart;
+        }
+    }
+
+    TD->HwTD.Token.TransferBytes = LengthThisTD;
+    TD->LengthThisTD = LengthThisTD;
+
+    return LengthThisTD + TransferedLen;
+}
+
+VOID
+NTAPI
+EHCI_EnableAsyncList(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND UsbCmd;
+
+    DPRINT_EHCI("EHCI_EnableAsyncList: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    UsbCmd.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    UsbCmd.AsynchronousEnable = 1;
+    WRITE_REGISTER_ULONG((&OperationalRegs->HcCommand.AsULONG), UsbCmd.AsULONG);
+}
+
+VOID
+NTAPI
+EHCI_DisableAsyncList(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND UsbCmd;
+
+    DPRINT("EHCI_DisableAsyncList: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    UsbCmd.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    UsbCmd.AsynchronousEnable = 0;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, UsbCmd.AsULONG);
+}
+
+VOID
+NTAPI
+EHCI_EnablePeriodicList(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+
+    DPRINT("EHCI_EnablePeriodicList: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Command.PeriodicEnable = 1;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+}
+
+VOID
+NTAPI
+EHCI_FlushAsyncCache(IN PEHCI_EXTENSION EhciExtension)
+{
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+    EHCI_USB_STATUS Status;
+    LARGE_INTEGER CurrentTime;
+    LARGE_INTEGER EndTime;
+    EHCI_USB_COMMAND Cmd;
+
+    DPRINT_EHCI("EHCI_FlushAsyncCache: EhciExtension - %p\n", EhciExtension);
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+    Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+    Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+
+    if (!Status.AsynchronousStatus && !Command.AsynchronousEnable)
+        return;
+
+    if (Status.AsynchronousStatus && !Command.AsynchronousEnable)
+    {
+        KeQuerySystemTime(&EndTime);
+        EndTime.QuadPart += 100 * 10000;  //100 ms
+
+        do
+        {
+            Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+            Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+            KeQuerySystemTime(&CurrentTime);
+
+            if (CurrentTime.QuadPart > EndTime.QuadPart)
+                RegPacket.UsbPortBugCheck(EhciExtension);
+        }
+        while (Status.AsynchronousStatus && Command.AsULONG != -1 && Command.Run);
+
+        return;
+    }
+
+    if (!Status.AsynchronousStatus && Command.AsynchronousEnable)
+    {
+        KeQuerySystemTime(&EndTime);
+        EndTime.QuadPart += 100 * 10000;  //100 ms
+
+        do
+        {
+            Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+            Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+            KeQuerySystemTime(&CurrentTime);
+        }
+        while (!Status.AsynchronousStatus && Command.AsULONG != -1 && Command.Run);
+    }
+
+    Command.InterruptAdvanceDoorbell = 1;
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG, Command.AsULONG);
+
+    KeQuerySystemTime(&EndTime);
+    EndTime.QuadPart += 100 * 10000;  //100 ms
+
+    Cmd.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+
+    if (Cmd.InterruptAdvanceDoorbell)
+    {
+        while (Cmd.Run)
+        {
+            if (Cmd.AsULONG == -1)
+                break;
+
+            KeStallExecutionProcessor(1);
+            Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+            KeQuerySystemTime(&CurrentTime);
+
+            if (!Command.InterruptAdvanceDoorbell)
+                break;
+
+            Cmd = Command;
+        }
+    }
+
+    /* InterruptOnAsyncAdvance */
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG, 0x20);
+}
+
+VOID
+NTAPI
+EHCI_LockQH(IN PEHCI_EXTENSION EhciExtension,
+            IN PEHCI_HCD_QH QH,
+            IN ULONG TransferType)
+{
+    PEHCI_HCD_QH PrevQH;
+    PEHCI_HCD_QH NextQH;
+    ULONG QhPA;
+    ULONG FrameIndexReg;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+
+    DPRINT_EHCI("EHCI_LockQH: QH - %p, TransferType - %x\n",
+                QH,
+                TransferType);
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    ASSERT((QH->sqh.QhFlags & EHCI_QH_FLAG_UPDATING) == 0);
+    ASSERT(EhciExtension->LockQH == NULL);
+
+    PrevQH = QH->sqh.PrevHead;
+    QH->sqh.QhFlags |= EHCI_QH_FLAG_UPDATING;
+
+    ASSERT(PrevQH);
+
+    NextQH = QH->sqh.NextHead;
+
+    EhciExtension->PrevQH = PrevQH;
+    EhciExtension->NextQH = NextQH;
+    EhciExtension->LockQH = QH;
+
+    if (NextQH)
+    {
+        QhPA = NextQH->sqh.PhysicalAddress;
+        QhPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+        QhPA |= (EHCI_LINK_TYPE_QH << 1);
+    }
+    else
+    {
+        QhPA = TERMINATE_POINTER;
+    }
+
+    PrevQH->sqh.HwQH.HorizontalLink.AsULONG = QhPA;
+
+    FrameIndexReg = READ_REGISTER_ULONG(&OperationalRegs->FrameIndex);
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+    {
+        do
+        {
+            Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+        }
+        while (READ_REGISTER_ULONG(&OperationalRegs->FrameIndex) ==
+               FrameIndexReg && (Command.AsULONG != -1) && Command.Run);
+    }
+    else
+    {
+        EHCI_FlushAsyncCache(EhciExtension);
+    }
+}
+
+VOID
+NTAPI
+EHCI_UnlockQH(IN PEHCI_EXTENSION EhciExtension,
+              IN PEHCI_HCD_QH QH)
+{
+    ULONG QhPA;
+
+    DPRINT_EHCI("EHCI_UnlockQH: QH - %p\n", QH);
+
+    ASSERT(QH->sqh.QhFlags & EHCI_QH_FLAG_UPDATING);
+    ASSERT(EhciExtension->LockQH);
+    ASSERT(EhciExtension->LockQH == QH);
+
+    QH->sqh.QhFlags &= ~EHCI_QH_FLAG_UPDATING;
+
+    EhciExtension->LockQH = NULL;
+
+    QhPA = QH->sqh.PhysicalAddress;
+    QhPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+    QhPA |= (EHCI_LINK_TYPE_QH << 1);
+
+    EhciExtension->PrevQH->sqh.HwQH.HorizontalLink.AsULONG = QhPA;
+}
+
+VOID
+NTAPI
+EHCI_LinkTransferToQueue(IN PEHCI_EXTENSION EhciExtension,
+                         IN PEHCI_ENDPOINT EhciEndpoint,
+                         IN PEHCI_HCD_TD NextTD)
+{
+    PEHCI_HCD_QH QH;
+    PEHCI_HCD_TD TD;
+    PEHCI_TRANSFER Transfer;
+    PEHCI_HCD_TD LinkTD;
+    BOOLEAN IsPresent;
+    ULONG ix;
+
+    DPRINT_EHCI("EHCI_LinkTransferToQueue: EhciEndpoint - %p, NextTD - %p\n",
+                EhciEndpoint,
+                NextTD);
+
+    ASSERT(EhciEndpoint->HcdHeadP != NULL);
+    IsPresent = EHCI_HardwarePresent(EhciExtension, 0);
+
+    QH = EhciEndpoint->QH;
+    TD = EhciEndpoint->HcdHeadP;
+
+    if (TD == EhciEndpoint->HcdTailP)
+    {
+        if (IsPresent)
+        {
+            EHCI_LockQH(EhciExtension,
+                        QH,
+                        EhciEndpoint->EndpointProperties.TransferType);
+        }
+
+        QH->sqh.HwQH.CurrentTD = EhciEndpoint->DmaBufferPA;
+        QH->sqh.HwQH.NextTD = NextTD->PhysicalAddress;
+        QH->sqh.HwQH.AlternateNextTD = NextTD->HwTD.AlternateNextTD;
+
+        QH->sqh.HwQH.Token.Status = (UCHAR)~(EHCI_TOKEN_STATUS_ACTIVE |
+                                             EHCI_TOKEN_STATUS_HALTED);
+
+        QH->sqh.HwQH.Token.TransferBytes = 0;
+
+        if (IsPresent)
+            EHCI_UnlockQH(EhciExtension, QH);
+
+        EhciEndpoint->HcdHeadP = NextTD;
+    }
+    else
+    {
+        DPRINT_EHCI("EHCI_LinkTransferToQueue: TD - %p, HcdTailP - %p\n",
+                    EhciEndpoint->HcdHeadP,
+                    EhciEndpoint->HcdTailP);
+
+        LinkTD = EhciEndpoint->HcdHeadP;
+
+        while (TD != EhciEndpoint->HcdTailP)
+        {
+            LinkTD = TD;
+            TD = TD->NextHcdTD;
+        }
+
+        ASSERT(LinkTD != EhciEndpoint->HcdTailP);
+
+        Transfer = LinkTD->EhciTransfer;
+
+        TD = EhciEndpoint->FirstTD;
+
+        for (ix = 0; ix < EhciEndpoint->MaxTDs; ix++)
+        {
+            if (TD->EhciTransfer == Transfer)
+            {
+                TD->AltNextHcdTD = NextTD;
+                TD->HwTD.AlternateNextTD = NextTD->PhysicalAddress;
+            }
+
+            TD += 1;
+        }
+
+        LinkTD->HwTD.NextTD = NextTD->PhysicalAddress;
+        LinkTD->NextHcdTD = NextTD;
+
+        if (QH->sqh.HwQH.CurrentTD == LinkTD->PhysicalAddress)
+        {
+            QH->sqh.HwQH.NextTD = NextTD->PhysicalAddress;
+            QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+        }
+    }
+}
+
+MPSTATUS
+NTAPI
+EHCI_ControlTransfer(IN PEHCI_EXTENSION EhciExtension,
+                     IN PEHCI_ENDPOINT EhciEndpoint,
+                     IN PUSBPORT_TRANSFER_PARAMETERS TransferParameters,
+                     IN PEHCI_TRANSFER EhciTransfer,
+                     IN PUSBPORT_SCATTER_GATHER_LIST SgList)
+{
+    PEHCI_HCD_TD FirstTD;
+    PEHCI_HCD_TD LastTD;
+    PEHCI_HCD_TD TD;
+    PEHCI_HCD_TD PrevTD;
+    PEHCI_HCD_TD LinkTD;
+    ULONG TransferedLen = 0;
+    EHCI_TD_TOKEN Token;
+    ULONG DataToggle = 1;
+
+    DPRINT_EHCI("EHCI_ControlTransfer: EhciEndpoint - %p, EhciTransfer - %p\n",
+                EhciEndpoint,
+                EhciTransfer);
+
+    if (EhciEndpoint->RemainTDs < EHCI_MAX_CONTROL_TD_COUNT)
+        return MP_STATUS_FAILURE;
+
+    EhciExtension->PendingTransfers++;
+    EhciEndpoint->PendingTDs++;
+
+    EhciTransfer->TransferOnAsyncList = 1;
+
+    FirstTD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+    if (!FirstTD)
+    {
+        RegPacket.UsbPortBugCheck(EhciExtension);
+        return MP_STATUS_FAILURE;
+    }
+
+    EhciTransfer->PendingTDs++;
+
+    FirstTD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+    FirstTD->EhciTransfer = EhciTransfer;
+
+    FirstTD->HwTD.Buffer[0] = FirstTD->PhysicalAddress + FIELD_OFFSET(EHCI_HCD_TD, SetupPacket);
+    FirstTD->HwTD.Buffer[1] = 0;
+    FirstTD->HwTD.Buffer[2] = 0;
+    FirstTD->HwTD.Buffer[3] = 0;
+    FirstTD->HwTD.Buffer[4] = 0;
+
+    FirstTD->NextHcdTD = NULL;
+
+    FirstTD->HwTD.NextTD = TERMINATE_POINTER;
+    FirstTD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+    FirstTD->HwTD.Token.AsULONG = 0;
+    FirstTD->HwTD.Token.ErrorCounter = 3;
+    FirstTD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_SETUP;
+    FirstTD->HwTD.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+    FirstTD->HwTD.Token.TransferBytes = sizeof(FirstTD->SetupPacket);
+
+    RtlCopyMemory(&FirstTD->SetupPacket,
+                  &TransferParameters->SetupPacket,
+                  sizeof(FirstTD->SetupPacket));
+
+    LastTD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+    if (!LastTD)
+    {
+        RegPacket.UsbPortBugCheck(EhciExtension);
+        return MP_STATUS_FAILURE;
+    }
+
+    EhciTransfer->PendingTDs++;
+
+    LastTD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+    LastTD->EhciTransfer = EhciTransfer;
+
+    LastTD->HwTD.Buffer[0] = 0;
+    LastTD->HwTD.Buffer[1] = 0;
+    LastTD->HwTD.Buffer[2] = 0;
+    LastTD->HwTD.Buffer[3] = 0;
+    LastTD->HwTD.Buffer[4] = 0;
+
+    LastTD->NextHcdTD = NULL;
+    LastTD->HwTD.NextTD = TERMINATE_POINTER;
+    LastTD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+    LastTD->HwTD.Token.AsULONG = 0;
+    LastTD->HwTD.Token.ErrorCounter = 3;
+
+    FirstTD->AltNextHcdTD = LastTD;
+    FirstTD->HwTD.AlternateNextTD = LastTD->PhysicalAddress;
+
+    PrevTD = FirstTD;
+    LinkTD = FirstTD;
+
+    while (TransferedLen < TransferParameters->TransferBufferLength)
+    {
+        TD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+        if (!TD)
+        {
+            RegPacket.UsbPortBugCheck(EhciExtension);
+            return MP_STATUS_FAILURE;
+        }
+
+        LinkTD = TD;
+
+        EhciTransfer->PendingTDs++;
+
+        TD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+        TD->EhciTransfer = EhciTransfer;
+
+        TD->HwTD.Buffer[0] = 0;
+        TD->HwTD.Buffer[1] = 0;
+        TD->HwTD.Buffer[2] = 0;
+        TD->HwTD.Buffer[3] = 0;
+        TD->HwTD.Buffer[4] = 0;
+
+        TD->NextHcdTD = NULL;
+
+        TD->HwTD.NextTD = TERMINATE_POINTER;
+        TD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+        TD->HwTD.Token.AsULONG = 0;
+        TD->HwTD.Token.ErrorCounter = 3;
+
+        PrevTD->NextHcdTD = TD;
+        PrevTD->HwTD.NextTD = TD->PhysicalAddress;
+
+        if (TransferParameters->TransferFlags & USBD_TRANSFER_DIRECTION_IN)
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_IN;
+        else
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_OUT;
+
+        TD->HwTD.Token.DataToggle = DataToggle;
+        TD->HwTD.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+
+        if (DataToggle)
+            TD->HwTD.Token.DataToggle = 1;
+        else
+            TD->HwTD.Token.DataToggle = 0;
+
+        TD->AltNextHcdTD = LastTD;
+        TD->HwTD.AlternateNextTD = LastTD->PhysicalAddress;
+
+        TransferedLen = EHCI_MapAsyncTransferToTd(EhciExtension,
+                                                  EhciEndpoint->EndpointProperties.MaxPacketSize,
+                                                  TransferedLen,
+                                                  &DataToggle,
+                                                  EhciTransfer,
+                                                  TD,
+                                                  SgList);
+
+        PrevTD = TD;
+    }
+
+    LinkTD->NextHcdTD = LastTD;
+    LinkTD->HwTD.NextTD = LastTD->PhysicalAddress;
+
+    LastTD->HwTD.Buffer[0] = 0;
+    LastTD->LengthThisTD = 0;
+
+    Token.AsULONG = 0;
+    Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+    Token.InterruptOnComplete = 1;
+    Token.DataToggle = 1;
+
+    if (TransferParameters->TransferFlags & USBD_TRANSFER_DIRECTION_IN)
+        Token.PIDCode = EHCI_TD_TOKEN_PID_OUT;
+    else
+        Token.PIDCode = EHCI_TD_TOKEN_PID_IN;
+
+    LastTD->HwTD.Token = Token;
+
+    LastTD->NextHcdTD = EhciEndpoint->HcdTailP;
+    LastTD->HwTD.NextTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+
+    EHCI_EnableAsyncList(EhciExtension);
+    EHCI_LinkTransferToQueue(EhciExtension, EhciEndpoint, FirstTD);
+
+    ASSERT(EhciEndpoint->HcdTailP->NextHcdTD == NULL);
+    ASSERT(EhciEndpoint->HcdTailP->AltNextHcdTD == NULL);
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_BulkTransfer(IN PEHCI_EXTENSION EhciExtension,
+                  IN PEHCI_ENDPOINT EhciEndpoint,
+                  IN PUSBPORT_TRANSFER_PARAMETERS TransferParameters,
+                  IN PEHCI_TRANSFER EhciTransfer,
+                  IN PUSBPORT_SCATTER_GATHER_LIST SgList)
+{
+    PEHCI_HCD_TD PrevTD;
+    PEHCI_HCD_TD FirstTD;
+    PEHCI_HCD_TD TD;
+    ULONG TransferedLen;
+
+    DPRINT_EHCI("EHCI_BulkTransfer: EhciEndpoint - %p, EhciTransfer - %p\n",
+                EhciEndpoint,
+                EhciTransfer);
+
+    if (((TransferParameters->TransferBufferLength /
+        ((EHCI_MAX_QTD_BUFFER_PAGES - 1) * PAGE_SIZE)) + 1) > EhciEndpoint->RemainTDs)
+    {
+        DPRINT1("EHCI_BulkTransfer: return MP_STATUS_FAILURE\n");
+        return MP_STATUS_FAILURE;
+    }
+
+    EhciExtension->PendingTransfers++;
+    EhciEndpoint->PendingTDs++;
+
+    EhciTransfer->TransferOnAsyncList = 1;
+
+    TransferedLen = 0;
+    PrevTD = NULL;
+
+    if (TransferParameters->TransferBufferLength)
+    {
+        while (TransferedLen < TransferParameters->TransferBufferLength)
+        {
+            TD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+            if (!TD)
+            {
+                RegPacket.UsbPortBugCheck(EhciExtension);
+                return MP_STATUS_FAILURE;
+            }
+
+            EhciTransfer->PendingTDs++;
+
+            TD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+            TD->EhciTransfer = EhciTransfer;
+
+            TD->HwTD.Buffer[0] = 0;
+            TD->HwTD.Buffer[1] = 0;
+            TD->HwTD.Buffer[2] = 0;
+            TD->HwTD.Buffer[3] = 0;
+            TD->HwTD.Buffer[4] = 0;
+
+            TD->NextHcdTD = NULL;
+            TD->HwTD.NextTD = TERMINATE_POINTER;
+            TD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+            TD->HwTD.Token.AsULONG = 0;
+            TD->HwTD.Token.ErrorCounter = 3;
+
+            if (EhciTransfer->PendingTDs == 1)
+            {
+                FirstTD = TD;
+            }
+            else
+            {
+                PrevTD->HwTD.NextTD = TD->PhysicalAddress;
+                PrevTD->NextHcdTD = TD;
+            }
+
+            TD->HwTD.AlternateNextTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+            TD->AltNextHcdTD = EhciEndpoint->HcdTailP;
+
+            TD->HwTD.Token.InterruptOnComplete = 1;
+
+            if (TransferParameters->TransferFlags & USBD_TRANSFER_DIRECTION_IN)
+                TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_IN;
+            else
+                TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_OUT;
+
+            TD->HwTD.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+            TD->HwTD.Token.DataToggle = 1;
+
+            TransferedLen = EHCI_MapAsyncTransferToTd(EhciExtension,
+                                                      EhciEndpoint->EndpointProperties.MaxPacketSize,
+                                                      TransferedLen,
+                                                      0,
+                                                      EhciTransfer,
+                                                      TD,
+                                                      SgList);
+
+            PrevTD = TD;
+        }
+    }
+    else
+    {
+        TD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+        if (!TD)
+        {
+            RegPacket.UsbPortBugCheck(EhciExtension);
+            return MP_STATUS_FAILURE;
+        }
+
+        EhciTransfer->PendingTDs++;
+
+        TD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+        TD->EhciTransfer = EhciTransfer;
+
+        TD->HwTD.Buffer[0] = 0;
+        TD->HwTD.Buffer[1] = 0;
+        TD->HwTD.Buffer[2] = 0;
+        TD->HwTD.Buffer[3] = 0;
+        TD->HwTD.Buffer[4] = 0;
+
+        TD->HwTD.NextTD = TERMINATE_POINTER;
+        TD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+        TD->HwTD.Token.AsULONG = 0;
+        TD->HwTD.Token.ErrorCounter = 3;
+
+        TD->NextHcdTD = NULL;
+
+        ASSERT(EhciTransfer->PendingTDs == 1);
+
+        FirstTD = TD;
+
+        TD->HwTD.AlternateNextTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+        TD->AltNextHcdTD = EhciEndpoint->HcdTailP;
+
+        TD->HwTD.Token.InterruptOnComplete = 1;
+
+        if (TransferParameters->TransferFlags & USBD_TRANSFER_DIRECTION_IN)
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_IN;
+        else
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_OUT;
+
+        TD->HwTD.Buffer[0] = TD->PhysicalAddress;
+
+        TD->HwTD.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+        TD->HwTD.Token.DataToggle = 1;
+
+        TD->LengthThisTD = 0;
+    }
+
+    TD->HwTD.NextTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+    TD->NextHcdTD = EhciEndpoint->HcdTailP;
+
+    EHCI_EnableAsyncList(EhciExtension);
+    EHCI_LinkTransferToQueue(EhciExtension, EhciEndpoint, FirstTD);
+
+    ASSERT(EhciEndpoint->HcdTailP->NextHcdTD == 0);
+    ASSERT(EhciEndpoint->HcdTailP->AltNextHcdTD == 0);
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_InterruptTransfer(IN PEHCI_EXTENSION EhciExtension,
+                       IN PEHCI_ENDPOINT EhciEndpoint,
+                       IN PUSBPORT_TRANSFER_PARAMETERS TransferParameters,
+                       IN PEHCI_TRANSFER EhciTransfer,
+                       IN PUSBPORT_SCATTER_GATHER_LIST SgList)
+{
+    PEHCI_HCD_TD TD;
+    PEHCI_HCD_TD FirstTD;
+    PEHCI_HCD_TD PrevTD = NULL;
+    ULONG TransferedLen = 0;
+
+    DPRINT_EHCI("EHCI_InterruptTransfer: EhciEndpoint - %p, EhciTransfer - %p\n",
+                EhciEndpoint,
+                EhciTransfer);
+
+    if (!EhciEndpoint->RemainTDs)
+    {
+        DPRINT1("EHCI_InterruptTransfer: EhciEndpoint - %p\n", EhciEndpoint);
+        DbgBreakPoint();
+        return MP_STATUS_FAILURE;
+    }
+
+    EhciEndpoint->PendingTDs++;
+
+    if (!TransferParameters->TransferBufferLength)
+    {
+        DPRINT1("EHCI_InterruptTransfer: EhciEndpoint - %p\n", EhciEndpoint);
+        DbgBreakPoint();
+        return MP_STATUS_FAILURE;
+    }
+
+    while (TransferedLen < TransferParameters->TransferBufferLength)
+    {
+        TD = EHCI_AllocTd(EhciExtension, EhciEndpoint);
+
+        if (!TD)
+        {
+            DPRINT1("EHCI_InterruptTransfer: EhciEndpoint - %p\n", EhciEndpoint);
+            RegPacket.UsbPortBugCheck(EhciExtension);
+            return MP_STATUS_FAILURE;
+        }
+
+        EhciTransfer->PendingTDs++;
+
+        TD->TdFlags |= EHCI_HCD_TD_FLAG_PROCESSED;
+        TD->EhciTransfer = EhciTransfer;
+
+        TD->HwTD.Buffer[0] = 0;
+        TD->HwTD.Buffer[1] = 0;
+        TD->HwTD.Buffer[2] = 0;
+        TD->HwTD.Buffer[3] = 0;
+        TD->HwTD.Buffer[4] = 0;
+
+        TD->HwTD.NextTD = TERMINATE_POINTER;
+        TD->HwTD.AlternateNextTD = TERMINATE_POINTER;
+
+        TD->HwTD.Token.AsULONG = 0;
+        TD->HwTD.Token.ErrorCounter = 3;
+
+        TD->NextHcdTD = NULL;
+
+        if (EhciTransfer->PendingTDs == 1)
+        {
+            FirstTD = TD;
+        }
+        else if (PrevTD)
+        {
+            PrevTD->HwTD.NextTD = TD->PhysicalAddress;
+            PrevTD->NextHcdTD = TD;
+        }
+
+        if (TransferParameters->TransferFlags & USBD_TRANSFER_DIRECTION_IN)
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_IN;
+        else
+            TD->HwTD.Token.PIDCode = EHCI_TD_TOKEN_PID_OUT;
+
+        TD->HwTD.Token.Status = (UCHAR)EHCI_TOKEN_STATUS_ACTIVE;
+        TD->HwTD.Token.DataToggle = 1;
+
+        TransferedLen = EHCI_MapAsyncTransferToTd(EhciExtension,
+                                                  EhciEndpoint->EndpointProperties.TotalMaxPacketSize,
+                                                  TransferedLen,
+                                                  NULL,
+                                                  EhciTransfer,
+                                                  TD,
+                                                  SgList);
+
+        PrevTD = TD;
+    }
+
+    TD->HwTD.Token.InterruptOnComplete = 1;
+
+    DPRINT_EHCI("EHCI_InterruptTransfer: PendingTDs - %x, TD->PhysicalAddress - %p, FirstTD - %p\n",
+                EhciTransfer->PendingTDs,
+                TD->PhysicalAddress,
+                FirstTD);
+
+    TD->HwTD.NextTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+    TD->NextHcdTD = EhciEndpoint->HcdTailP;
+
+    EHCI_LinkTransferToQueue(EhciExtension, EhciEndpoint, FirstTD);
+
+    ASSERT(EhciEndpoint->HcdTailP->NextHcdTD == NULL);
+    ASSERT(EhciEndpoint->HcdTailP->AltNextHcdTD == NULL);
+
+    EHCI_EnablePeriodicList(EhciExtension);
+
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_SubmitTransfer(IN PVOID ehciExtension,
+                    IN PVOID ehciEndpoint,
+                    IN PUSBPORT_TRANSFER_PARAMETERS TransferParameters,
+                    IN PVOID ehciTransfer,
+                    IN PUSBPORT_SCATTER_GATHER_LIST SgList)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_ENDPOINT EhciEndpoint = ehciEndpoint;
+    PEHCI_TRANSFER EhciTransfer = ehciTransfer;
+    MPSTATUS MPStatus;
+
+    DPRINT_EHCI("EHCI_SubmitTransfer: EhciEndpoint - %p, EhciTransfer - %p\n",
+                EhciEndpoint,
+                EhciTransfer);
+
+    RtlZeroMemory(EhciTransfer, sizeof(EHCI_TRANSFER));
+
+    EhciTransfer->TransferParameters = TransferParameters;
+    EhciTransfer->USBDStatus = USBD_STATUS_SUCCESS;
+    EhciTransfer->EhciEndpoint = EhciEndpoint;
+
+    switch (EhciEndpoint->EndpointProperties.TransferType)
+    {
+        case USBPORT_TRANSFER_TYPE_CONTROL:
+            MPStatus = EHCI_ControlTransfer(EhciExtension,
+                                            EhciEndpoint,
+                                            TransferParameters,
+                                            EhciTransfer,
+                                            SgList);
+            break;
+
+        case USBPORT_TRANSFER_TYPE_BULK:
+            MPStatus = EHCI_BulkTransfer(EhciExtension,
+                                         EhciEndpoint,
+                                         TransferParameters,
+                                         EhciTransfer,
+                                         SgList);
+            break;
+
+        case USBPORT_TRANSFER_TYPE_INTERRUPT:
+            MPStatus = EHCI_InterruptTransfer(EhciExtension,
+                                              EhciEndpoint,
+                                              TransferParameters,
+                                              EhciTransfer,
+                                              SgList);
+            break;
+
+        default:
+            DbgBreakPoint();
+            MPStatus = MP_STATUS_NOT_SUPPORTED;
+            break;
+    }
+
+    return MPStatus;
+}
+
+MPSTATUS
+NTAPI
+EHCI_SubmitIsoTransfer(IN PVOID ehciExtension,
+                       IN PVOID ehciEndpoint,
+                       IN PUSBPORT_TRANSFER_PARAMETERS TransferParameters,
+                       IN PVOID ehciTransfer,
+                       IN PVOID isoParameters)
+{
+    DPRINT1("EHCI_SubmitIsoTransfer: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_SUCCESS;
+}
+
+VOID
+NTAPI
+EHCI_AbortIsoTransfer(IN PEHCI_EXTENSION EhciExtension,
+                      IN PEHCI_ENDPOINT EhciEndpoint,
+                      IN PEHCI_TRANSFER EhciTransfer)
+{
+    DPRINT1("EHCI_AbortIsoTransfer: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_AbortAsyncTransfer(IN PEHCI_EXTENSION EhciExtension,
+                        IN PEHCI_ENDPOINT EhciEndpoint,
+                        IN PEHCI_TRANSFER EhciTransfer)
+{
+    PEHCI_HCD_QH QH;
+    PEHCI_HCD_TD TD;
+    ULONG TransferLength;
+    PEHCI_HCD_TD CurrentTD;
+    PEHCI_TRANSFER CurrentTransfer;
+    ULONG FirstTdPA;
+    PEHCI_HCD_TD LastTD;
+    PEHCI_HCD_TD PrevTD;
+    ULONG NextTD;
+
+    DPRINT("EHCI_AbortAsyncTransfer: EhciEndpoint - %p, EhciTransfer - %p\n",
+           EhciEndpoint,
+           EhciTransfer);
+
+    QH = EhciEndpoint->QH;
+    TD = EhciEndpoint->HcdHeadP;
+
+    ASSERT(EhciEndpoint->PendingTDs);
+    EhciEndpoint->PendingTDs--;
+
+    if (TD->EhciTransfer == EhciTransfer)
+    {
+        TransferLength = 0;
+
+        while (TD != EhciEndpoint->HcdTailP &&
+               TD->EhciTransfer == EhciTransfer)
+        {
+            TransferLength += TD->LengthThisTD - TD->HwTD.Token.TransferBytes;
+
+            TD->HwTD.NextTD = 0;
+            TD->HwTD.AlternateNextTD = 0;
+
+            TD->TdFlags = 0;
+            TD->EhciTransfer = NULL;
+
+            EhciEndpoint->RemainTDs++;
+
+            TD = TD->NextHcdTD;
+        }
+
+        if (TransferLength)
+            EhciTransfer->TransferLen += TransferLength;
+
+        QH->sqh.HwQH.CurrentTD = EhciEndpoint->DmaBufferPA;
+        QH->sqh.HwQH.NextTD = TD->PhysicalAddress;
+        QH->sqh.HwQH.AlternateNextTD = TD->HwTD.AlternateNextTD;
+
+        QH->sqh.HwQH.Token.TransferBytes = 0;
+        QH->sqh.HwQH.Token.Status = (UCHAR)~(EHCI_TOKEN_STATUS_ACTIVE |
+                                             EHCI_TOKEN_STATUS_HALTED);
+
+        EhciEndpoint->HcdHeadP = TD;
+    }
+    else
+    {
+        DPRINT("EHCI_AbortAsyncTransfer: TD->EhciTransfer - %p\n", TD->EhciTransfer);
+
+        CurrentTD = RegPacket.UsbPortGetMappedVirtualAddress(QH->sqh.HwQH.CurrentTD,
+                                                             EhciExtension,
+                                                             EhciEndpoint);
+
+        CurrentTransfer = CurrentTD->EhciTransfer;
+        TD = EhciEndpoint->HcdHeadP;
+
+        while (TD && TD->EhciTransfer != EhciTransfer)
+        {
+            PrevTD = TD;
+            TD = TD->NextHcdTD;
+        }
+
+        FirstTdPA = TD->PhysicalAddress;
+
+        while (TD && TD->EhciTransfer == EhciTransfer)
+        {
+            TD->HwTD.NextTD = 0;
+            TD->HwTD.AlternateNextTD = 0;
+
+            TD->TdFlags = 0;
+            TD->EhciTransfer = NULL;
+
+            EhciEndpoint->RemainTDs++;
+
+            TD = TD->NextHcdTD;
+        }
+
+        LastTD = TD;
+        NextTD = LastTD->PhysicalAddress + FIELD_OFFSET(EHCI_HCD_TD, HwTD.NextTD);
+
+        PrevTD->HwTD.NextTD = LastTD->PhysicalAddress;
+        PrevTD->HwTD.AlternateNextTD = LastTD->PhysicalAddress;
+
+        PrevTD->NextHcdTD = LastTD;
+        PrevTD->AltNextHcdTD = LastTD;
+
+        if (CurrentTransfer == EhciTransfer)
+        {
+            QH->sqh.HwQH.CurrentTD = EhciEndpoint->DmaBufferPA;
+
+            QH->sqh.HwQH.Token.Status = (UCHAR)~EHCI_TOKEN_STATUS_ACTIVE;
+            QH->sqh.HwQH.Token.TransferBytes = 0;
+
+            QH->sqh.HwQH.NextTD = NextTD;
+            QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+
+            return;
+        }
+
+        if (PrevTD->EhciTransfer == CurrentTransfer)
+        {
+            if (QH->sqh.HwQH.NextTD == FirstTdPA)
+                QH->sqh.HwQH.NextTD = NextTD;
+
+            if (QH->sqh.HwQH.AlternateNextTD == FirstTdPA)
+                QH->sqh.HwQH.AlternateNextTD = NextTD;
+
+            for (TD = EhciEndpoint->HcdHeadP;
+                 TD;
+                 TD = TD->NextHcdTD)
+            {
+                if (TD->EhciTransfer == CurrentTransfer)
+                {
+                    TD->HwTD.AlternateNextTD = NextTD;
+                    TD->AltNextHcdTD = LastTD;
+                }
+            }
+        }
+    }
+}
+
+VOID
+NTAPI
+EHCI_AbortTransfer(IN PVOID ehciExtension,
+                   IN PVOID ehciEndpoint,
+                   IN PVOID ehciTransfer,
+                   IN PULONG CompletedLength)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_ENDPOINT EhciEndpoint = ehciEndpoint;
+    PEHCI_TRANSFER EhciTransfer = ehciTransfer;
+    ULONG TransferType;
+
+    DPRINT("EHCI_AbortTransfer: EhciTransfer - %p, CompletedLength - %x\n",
+           EhciTransfer,
+           CompletedLength);
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS)
+        EHCI_AbortIsoTransfer(EhciExtension, EhciEndpoint, EhciTransfer);
+    else
+        EHCI_AbortAsyncTransfer(EhciExtension, EhciEndpoint, EhciTransfer);
+}
+
+ULONG
+NTAPI
+EHCI_GetEndpointState(IN PVOID ehciExtension,
+                      IN PVOID ehciEndpoint)
+{
+    DPRINT1("EHCI_GetEndpointState: UNIMPLEMENTED. FIXME\n");
+    return 0;
+}
+
+VOID
+NTAPI
+EHCI_RemoveQhFromPeriodicList(IN PEHCI_EXTENSION EhciExtension,
+                              IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_QH QH;
+    PEHCI_HCD_QH NextHead;
+    ULONG NextQhPA;
+    PEHCI_HCD_QH PrevHead;
+
+    QH = EhciEndpoint->QH;
+
+    if (!(QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE))
+        return;
+
+    DPRINT("EHCI_RemoveQhFromPeriodicList: EhciEndpoint - %p, QH - %X, EhciEndpoint->StaticQH - %p\n",
+           EhciEndpoint,
+           QH,
+           EhciEndpoint->StaticQH);
+
+    NextHead = QH->sqh.NextHead;
+    PrevHead = QH->sqh.PrevHead;
+
+    PrevHead->sqh.NextHead = NextHead;
+
+    if (NextHead)
+    {
+        if (!(NextHead->sqh.QhFlags & EHCI_QH_FLAG_STATIC))
+            NextHead->sqh.PrevHead = PrevHead;
+
+        NextQhPA = NextHead->sqh.PhysicalAddress;
+        NextQhPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+        NextQhPA |= (EHCI_LINK_TYPE_QH << 1);
+
+        PrevHead->sqh.HwQH.HorizontalLink.AsULONG = NextQhPA;
+    }
+    else
+    {
+        PrevHead->sqh.HwQH.HorizontalLink.Terminate = 1;
+    }
+
+    QH->sqh.QhFlags &= ~EHCI_QH_FLAG_IN_SCHEDULE;
+
+    QH->sqh.NextHead = NULL;
+    QH->sqh.PrevHead = NULL;
+}
+
+VOID
+NTAPI
+EHCI_RemoveQhFromAsyncList(IN PEHCI_EXTENSION EhciExtension,
+                           IN PEHCI_HCD_QH QH)
+{
+    PEHCI_HCD_QH NextHead;
+    ULONG NextHeadPA;
+    PEHCI_HCD_QH PrevHead;
+    PEHCI_STATIC_QH AsyncHead;
+    ULONG AsyncHeadPA;
+
+    DPRINT("EHCI_RemoveQhFromAsyncList: QH - %p\n", QH);
+
+    if (QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE)
+    {
+        NextHead = QH->sqh.NextHead;
+        PrevHead = QH->sqh.PrevHead;
+
+        AsyncHead = EhciExtension->AsyncHead;
+
+        AsyncHeadPA = AsyncHead->PhysicalAddress;
+        AsyncHeadPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+        AsyncHeadPA |= (EHCI_LINK_TYPE_QH << 1);
+
+        NextHeadPA = NextHead->sqh.PhysicalAddress;
+        NextHeadPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+        NextHeadPA |= (EHCI_LINK_TYPE_QH << 1);
+
+        PrevHead->sqh.HwQH.HorizontalLink.AsULONG = NextHeadPA;
+
+        PrevHead->sqh.NextHead = NextHead;
+        NextHead->sqh.PrevHead = PrevHead;
+
+        EHCI_FlushAsyncCache(EhciExtension);
+
+        if (READ_REGISTER_ULONG(&EhciExtension->OperationalRegs->AsyncListBase) ==
+            QH->sqh.PhysicalAddress)
+        {
+            WRITE_REGISTER_ULONG(&EhciExtension->OperationalRegs->AsyncListBase,
+                                 AsyncHeadPA);
+        }
+
+        QH->sqh.QhFlags &= ~EHCI_QH_FLAG_IN_SCHEDULE;
+    }
+}
+
+VOID
+NTAPI
+EHCI_InsertQhInPeriodicList(IN PEHCI_EXTENSION EhciExtension,
+                            IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_STATIC_QH StaticQH;
+    PEHCI_HCD_QH QH;
+    ULONG QhPA;
+    PEHCI_HCD_QH NextHead;
+    PEHCI_HCD_QH PrevHead;
+
+    QH = EhciEndpoint->QH;
+    StaticQH = EhciEndpoint->StaticQH;
+
+    ASSERT((QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE) == 0);
+    ASSERT(StaticQH->QhFlags & EHCI_QH_FLAG_STATIC);
+
+    NextHead = StaticQH->NextHead;
+
+    QH->sqh.Period = EhciEndpoint->EndpointProperties.Period;
+    QH->sqh.Ordinal = EhciEndpoint->EndpointProperties.Reserved6;
+
+    DPRINT("EHCI_InsertQhInPeriodicList: EhciEndpoint - %p, QH - %X, EhciEndpoint->StaticQH - %p\n",
+           EhciEndpoint,
+           QH,
+           EhciEndpoint->StaticQH);
+
+    PrevHead = (PEHCI_HCD_QH)StaticQH;
+
+    if ((StaticQH->QhFlags & EHCI_QH_FLAG_STATIC) &&
+        (!NextHead || (NextHead->sqh.QhFlags & EHCI_QH_FLAG_STATIC)))
+    {
+        DPRINT("EHCI_InsertQhInPeriodicList: StaticQH - %p, StaticQH->NextHead - %p\n",
+               StaticQH,
+               StaticQH->NextHead);
+    }
+    else
+    {
+        while (NextHead &&
+               !(NextHead->sqh.QhFlags & EHCI_QH_FLAG_STATIC) &&
+               QH->sqh.Ordinal > NextHead->sqh.Ordinal)
+        {
+            PrevHead = NextHead;
+            NextHead = NextHead->sqh.NextHead;
+        }
+    }
+
+    QH->sqh.NextHead = NextHead;
+    QH->sqh.PrevHead = PrevHead;
+
+    if (NextHead && !(NextHead->sqh.QhFlags & EHCI_QH_FLAG_STATIC))
+        NextHead->sqh.PrevHead = QH;
+
+    QH->sqh.QhFlags |= EHCI_QH_FLAG_IN_SCHEDULE;
+    QH->sqh.HwQH.HorizontalLink = PrevHead->sqh.HwQH.HorizontalLink;
+
+    PrevHead->sqh.NextHead = QH;
+
+    QhPA = QH->sqh.PhysicalAddress;
+    QhPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+    QhPA |= (EHCI_LINK_TYPE_QH << 1);
+
+    PrevHead->sqh.HwQH.HorizontalLink.AsULONG = QhPA;
+}
+
+VOID
+NTAPI
+EHCI_InsertQhInAsyncList(IN PEHCI_EXTENSION EhciExtension,
+                         IN PEHCI_HCD_QH QH)
+{
+    PEHCI_STATIC_QH AsyncHead;
+    ULONG QhPA;
+    PEHCI_HCD_QH NextHead;
+
+    DPRINT("EHCI_InsertQhInAsyncList: QH - %p\n", QH);
+
+    ASSERT((QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE) == 0);
+    ASSERT((QH->sqh.QhFlags & EHCI_QH_FLAG_NUKED) == 0);
+
+    AsyncHead = EhciExtension->AsyncHead;
+    NextHead = AsyncHead->NextHead;
+
+    QH->sqh.HwQH.HorizontalLink = AsyncHead->HwQH.HorizontalLink;
+    QH->sqh.QhFlags |= EHCI_QH_FLAG_IN_SCHEDULE;
+    QH->sqh.NextHead = NextHead;
+    QH->sqh.PrevHead = (PEHCI_HCD_QH)AsyncHead;
+
+    NextHead->sqh.PrevHead = QH;
+
+    QhPA = QH->sqh.PhysicalAddress;
+    QhPA &= LINK_POINTER_MASK + TERMINATE_POINTER;
+    QhPA |= (EHCI_LINK_TYPE_QH << 1);
+
+    AsyncHead->HwQH.HorizontalLink.AsULONG = QhPA;
+
+    AsyncHead->NextHead = QH;
+}
+
+VOID
+NTAPI
+EHCI_SetIsoEndpointState(IN PEHCI_EXTENSION EhciExtension,
+                         IN PEHCI_ENDPOINT EhciEndpoint,
+                         IN ULONG EndpointState)
+{
+    DPRINT1("EHCI_SetIsoEndpointState: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_SetAsyncEndpointState(IN PEHCI_EXTENSION EhciExtension,
+                           IN PEHCI_ENDPOINT EhciEndpoint,
+                           IN ULONG EndpointState)
+{
+    PEHCI_HCD_QH QH;
+    ULONG TransferType;
+
+    DPRINT("EHCI_SetAsyncEndpointState: EhciEndpoint - %p, EndpointState - %x\n",
+            EhciEndpoint,
+            EndpointState);
+
+    QH = EhciEndpoint->QH;
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    switch (EndpointState)
+    {
+        case USBPORT_ENDPOINT_PAUSED:
+            if (TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+                EHCI_RemoveQhFromPeriodicList(EhciExtension, EhciEndpoint);
+            else
+                EHCI_RemoveQhFromAsyncList(EhciExtension, EhciEndpoint->QH);
+
+            break;
+
+        case USBPORT_ENDPOINT_ACTIVE:
+            if (TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+                EHCI_InsertQhInPeriodicList(EhciExtension, EhciEndpoint);
+            else
+                EHCI_InsertQhInAsyncList(EhciExtension, EhciEndpoint->QH);
+
+            break;
+
+        case USBPORT_ENDPOINT_REMOVE:
+            QH->sqh.QhFlags |= EHCI_QH_FLAG_CLOSED;
+
+            if (TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+                EHCI_RemoveQhFromPeriodicList(EhciExtension, EhciEndpoint);
+            else
+                EHCI_RemoveQhFromAsyncList(EhciExtension, EhciEndpoint->QH);
+
+            break;
+
+        default:
+            DbgBreakPoint();
+            break;
+    }
+
+    EhciEndpoint->EndpointState = EndpointState;
+}
+
+VOID
+NTAPI
+EHCI_SetEndpointState(IN PVOID ehciExtension,
+                      IN PVOID ehciEndpoint,
+                      IN ULONG EndpointState)
+{
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG TransferType;
+
+    DPRINT("EHCI_SetEndpointState: ... \n");
+
+    EhciEndpoint = ehciEndpoint;
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_CONTROL ||
+        TransferType == USBPORT_TRANSFER_TYPE_BULK ||
+        TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+    {
+         EHCI_SetAsyncEndpointState((PEHCI_EXTENSION)ehciExtension,
+                                    EhciEndpoint,
+                                    EndpointState);
+    }
+    else if (TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS)
+    {
+        EHCI_SetIsoEndpointState((PEHCI_EXTENSION)ehciExtension,
+                                 EhciEndpoint,
+                                 EndpointState);
+    }
+    else
+    {
+        RegPacket.UsbPortBugCheck(ehciExtension);
+    }
+}
+
+VOID
+NTAPI
+EHCI_InterruptNextSOF(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+
+    DPRINT_EHCI("EHCI_InterruptNextSOF: ... \n");
+
+    RegPacket.UsbPortInvalidateController(EhciExtension,
+                                          USBPORT_INVALIDATE_CONTROLLER_SOFT_INTERRUPT);
+}
+
+USBD_STATUS
+NTAPI
+EHCI_GetErrorFromTD(IN PEHCI_HCD_TD TD)
+{
+    EHCI_TD_TOKEN Token;
+
+    DPRINT_EHCI("EHCI_GetErrorFromTD: ... \n");
+
+    ASSERT(TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_HALTED);
+
+    Token = TD->HwTD.Token;
+
+    if (Token.Status & EHCI_TOKEN_STATUS_TRANSACTION_ERROR)
+    {
+        DPRINT("EHCI_GetErrorFromTD: TD - %p, TRANSACTION_ERROR\n", TD);
+        return USBD_STATUS_XACT_ERROR;
+    }
+
+    if (Token.Status & EHCI_TOKEN_STATUS_BABBLE_DETECTED)
+    {
+        DPRINT("EHCI_GetErrorFromTD: TD - %p, BABBLE_DETECTED\n", TD);
+        return USBD_STATUS_BABBLE_DETECTED;
+    }
+
+    if (Token.Status & EHCI_TOKEN_STATUS_DATA_BUFFER_ERROR)
+    {
+        DPRINT("EHCI_GetErrorFromTD: TD - %p, DATA_BUFFER_ERROR\n", TD);
+        return USBD_STATUS_DATA_BUFFER_ERROR;
+    }
+
+    if (Token.Status & EHCI_TOKEN_STATUS_MISSED_MICROFRAME)
+    {
+        DPRINT("EHCI_GetErrorFromTD: TD - %p, MISSED_MICROFRAME\n", TD);
+        return USBD_STATUS_XACT_ERROR;
+    }
+
+    DPRINT("EHCI_GetErrorFromTD: TD - %p, STALL_PID\n", TD);
+    return USBD_STATUS_STALL_PID;
+}
+
+VOID
+NTAPI
+EHCI_ProcessDoneAsyncTd(IN PEHCI_EXTENSION EhciExtension,
+                        IN PEHCI_HCD_TD TD)
+{
+    PEHCI_TRANSFER EhciTransfer;
+    PUSBPORT_TRANSFER_PARAMETERS TransferParameters;
+    ULONG TransferType;
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG LengthTransfered;
+    USBD_STATUS USBDStatus;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_COMMAND Command;
+
+    DPRINT_EHCI("EHCI_ProcessDoneAsyncTd: TD - %p\n", TD);
+
+    EhciTransfer = TD->EhciTransfer;
+
+    TransferParameters = EhciTransfer->TransferParameters;
+    EhciTransfer->PendingTDs--;
+
+    EhciEndpoint = EhciTransfer->EhciEndpoint;
+
+    if (!(TD->TdFlags & EHCI_HCD_TD_FLAG_ACTIVE))
+    {
+
+        if (TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_HALTED)
+            USBDStatus = EHCI_GetErrorFromTD(TD);
+        else
+            USBDStatus = USBD_STATUS_SUCCESS;
+
+        LengthTransfered = TD->LengthThisTD - TD->HwTD.Token.TransferBytes;
+
+        if (TD->HwTD.Token.PIDCode != EHCI_TD_TOKEN_PID_SETUP)
+            EhciTransfer->TransferLen += LengthTransfered;
+
+        if (USBDStatus != USBD_STATUS_SUCCESS)
+            EhciTransfer->USBDStatus = USBDStatus;
+    }
+
+    TD->HwTD.NextTD = 0;
+    TD->HwTD.AlternateNextTD = 0;
+
+    TD->TdFlags = 0;
+    TD->EhciTransfer = NULL;
+
+    EhciEndpoint->RemainTDs++;
+
+    if (EhciTransfer->PendingTDs == 0)
+    {
+        EhciEndpoint->PendingTDs--;
+
+        TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+        if (TransferType == USBPORT_TRANSFER_TYPE_CONTROL ||
+            TransferType == USBPORT_TRANSFER_TYPE_BULK)
+        {
+            EhciExtension->PendingTransfers--;
+
+            if (EhciExtension->PendingTransfers == 0)
+            {
+                OperationalRegs = EhciExtension->OperationalRegs;
+                Command.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcCommand.AsULONG);
+
+                if (!Command.InterruptAdvanceDoorbell &&
+                    (EhciExtension->Flags & EHCI_FLAGS_IDLE_SUPPORT))
+                {
+                    EHCI_DisableAsyncList(EhciExtension);
+                }
+            }
+        }
+
+        RegPacket.UsbPortCompleteTransfer(EhciExtension,
+                                          EhciEndpoint,
+                                          TransferParameters,
+                                          EhciTransfer->USBDStatus,
+                                          EhciTransfer->TransferLen);
+    }
+}
+
+VOID
+NTAPI
+EHCI_PollActiveAsyncEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                             IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_QH QH;
+    PEHCI_HCD_TD TD;
+    PEHCI_HCD_TD CurrentTD;
+    ULONG CurrentTDPhys;
+    BOOLEAN IsScheduled;
+
+    DPRINT_EHCI("EHCI_PollActiveAsyncEndpoint: ... \n");
+
+    QH = EhciEndpoint->QH;
+
+    CurrentTDPhys = QH->sqh.HwQH.CurrentTD & LINK_POINTER_MASK;
+    ASSERT(CurrentTDPhys);
+
+    CurrentTD = RegPacket.UsbPortGetMappedVirtualAddress(CurrentTDPhys,
+                                                         EhciExtension,
+                                                         EhciEndpoint);
+
+    if (CurrentTD == EhciEndpoint->DmaBufferVA)
+        return;
+
+    IsScheduled = QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE;
+
+    if (!EHCI_HardwarePresent(EhciExtension, 0))
+        IsScheduled = 0;
+
+    TD = EhciEndpoint->HcdHeadP;
+
+    if (TD == CurrentTD)
+    {
+        if (TD != EhciEndpoint->HcdTailP &&
+            !(TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE))
+        {
+            if (TD->NextHcdTD && TD->HwTD.NextTD != TD->NextHcdTD->PhysicalAddress)
+                TD->HwTD.NextTD = TD->NextHcdTD->PhysicalAddress;
+
+            if (TD->AltNextHcdTD &&
+                TD->HwTD.AlternateNextTD != TD->AltNextHcdTD->PhysicalAddress)
+            {
+                TD->HwTD.AlternateNextTD = TD->AltNextHcdTD->PhysicalAddress;
+            }
+
+            if (QH->sqh.HwQH.CurrentTD == TD->PhysicalAddress &&
+                !(TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE) &&
+                (QH->sqh.HwQH.NextTD != TD->HwTD.NextTD ||
+                 QH->sqh.HwQH.AlternateNextTD != TD->HwTD.AlternateNextTD))
+            {
+                QH->sqh.HwQH.NextTD = TD->HwTD.NextTD;
+                QH->sqh.HwQH.AlternateNextTD = TD->HwTD.AlternateNextTD;
+            }
+
+            EHCI_InterruptNextSOF(EhciExtension);
+        }
+    }
+    else
+    {
+        while (TD != CurrentTD)
+        {
+            ASSERT((TD->TdFlags & EHCI_HCD_TD_FLAG_DUMMY) == 0);
+
+            TD->TdFlags |= EHCI_HCD_TD_FLAG_DONE;
+
+            if (TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE)
+                TD->TdFlags |= EHCI_HCD_TD_FLAG_ACTIVE;
+
+            InsertTailList(&EhciEndpoint->ListTDs, &TD->DoneLink);
+            TD = TD->NextHcdTD;
+        }
+    }
+
+    if (CurrentTD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE)
+    {
+        ASSERT(TD != NULL);
+        EhciEndpoint->HcdHeadP = TD;
+        return;
+    }
+
+    if ((CurrentTD->NextHcdTD != EhciEndpoint->HcdTailP) &&
+        (CurrentTD->AltNextHcdTD != EhciEndpoint->HcdTailP ||
+         CurrentTD->HwTD.Token.TransferBytes == 0))
+    {
+        ASSERT(TD != NULL);
+        EhciEndpoint->HcdHeadP = TD;
+        return;
+    }
+
+    if (IsScheduled)
+    {
+        EHCI_LockQH(EhciExtension,
+                    QH,
+                    EhciEndpoint->EndpointProperties.TransferType);
+    }
+
+    QH->sqh.HwQH.CurrentTD = EhciEndpoint->DmaBufferPA;
+
+    CurrentTD->TdFlags |= EHCI_HCD_TD_FLAG_DONE;
+    InsertTailList(&EhciEndpoint->ListTDs, &CurrentTD->DoneLink);
+
+    if (CurrentTD->HwTD.Token.TransferBytes &&
+        CurrentTD->AltNextHcdTD == EhciEndpoint->HcdTailP)
+    {
+        TD = CurrentTD->NextHcdTD;
+
+        while (TD != EhciEndpoint->HcdTailP)
+        {
+            TD->TdFlags |= EHCI_HCD_TD_FLAG_ACTIVE;
+            InsertTailList(&EhciEndpoint->ListTDs, &TD->DoneLink);
+            TD = TD->NextHcdTD;
+        }
+    }
+
+    QH->sqh.HwQH.CurrentTD = EhciEndpoint->HcdTailP->PhysicalAddress;
+    QH->sqh.HwQH.NextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.Token.TransferBytes = 0;
+
+    EhciEndpoint->HcdHeadP = EhciEndpoint->HcdTailP;
+
+    if (IsScheduled)
+        EHCI_UnlockQH(EhciExtension, QH);
+}
+
+VOID
+NTAPI
+EHCI_PollHaltedAsyncEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                             IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_QH QH;
+    PEHCI_HCD_TD CurrentTD;
+    ULONG CurrentTdPA;
+    PEHCI_HCD_TD TD;
+    PEHCI_TRANSFER Transfer;
+    BOOLEAN IsScheduled;
+
+    DPRINT("EHCI_PollHaltedAsyncEndpoint: EhciEndpoint - %p\n", EhciEndpoint);
+
+    QH = EhciEndpoint->QH;
+    EHCI_DumpHwQH(QH);
+
+    CurrentTdPA = QH->sqh.HwQH.CurrentTD & LINK_POINTER_MASK;
+    ASSERT(CurrentTdPA);
+
+    IsScheduled = QH->sqh.QhFlags & EHCI_QH_FLAG_IN_SCHEDULE;
+
+    if (!EHCI_HardwarePresent(EhciExtension, 0))
+        IsScheduled = 0;
+
+    CurrentTD = RegPacket.UsbPortGetMappedVirtualAddress(CurrentTdPA,
+                                                         EhciExtension,
+                                                         EhciEndpoint);
+
+    DPRINT("EHCI_PollHaltedAsyncEndpoint: CurrentTD - %p\n", CurrentTD);
+
+    if (CurrentTD == EhciEndpoint->DmaBufferVA)
+        return;
+
+    ASSERT(EhciEndpoint->HcdTailP != CurrentTD);
+
+    if (IsScheduled)
+    {
+        EHCI_LockQH(EhciExtension,
+                    QH,
+                    EhciEndpoint->EndpointProperties.TransferType);
+    }
+
+    TD = EhciEndpoint->HcdHeadP;
+
+    while (TD != CurrentTD)
+    {
+        DPRINT("EHCI_PollHaltedAsyncEndpoint: TD - %p\n", TD);
+
+        ASSERT((TD->TdFlags & EHCI_HCD_TD_FLAG_DUMMY) == 0);
+
+        if (TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE)
+            TD->TdFlags |= EHCI_HCD_TD_FLAG_ACTIVE;
+
+        TD->TdFlags |= EHCI_HCD_TD_FLAG_DONE;
+
+        InsertTailList(&EhciEndpoint->ListTDs, &TD->DoneLink);
+
+        TD = TD->NextHcdTD;
+    }
+
+    TD = CurrentTD;
+
+    Transfer = CurrentTD->EhciTransfer;
+
+    do
+    {
+        DPRINT("EHCI_PollHaltedAsyncEndpoint: TD - %p\n", TD);
+
+        if (TD->HwTD.Token.Status & EHCI_TOKEN_STATUS_ACTIVE)
+            TD->TdFlags |= EHCI_HCD_TD_FLAG_ACTIVE;
+
+        TD->TdFlags |= EHCI_HCD_TD_FLAG_DONE;
+
+        InsertTailList(&EhciEndpoint->ListTDs, &TD->DoneLink);
+
+        TD = TD->NextHcdTD;
+    }
+    while (TD->EhciTransfer == Transfer);
+
+    EhciEndpoint->HcdHeadP = TD;
+
+    QH->sqh.HwQH.CurrentTD = EhciEndpoint->DmaBufferPA;
+    QH->sqh.HwQH.NextTD = TD->PhysicalAddress;
+    QH->sqh.HwQH.AlternateNextTD = TERMINATE_POINTER;
+    QH->sqh.HwQH.Token.TransferBytes = 0;
+
+    if (IsScheduled)
+        EHCI_UnlockQH(EhciExtension, QH);
+
+    if (EhciEndpoint->EndpointStatus & USBPORT_ENDPOINT_CONTROL)
+    {
+        EhciEndpoint->EndpointStatus &= ~USBPORT_ENDPOINT_HALT;
+        QH->sqh.HwQH.Token.ErrorCounter = 0;
+        QH->sqh.HwQH.Token.Status &= (UCHAR)~(EHCI_TOKEN_STATUS_ACTIVE |
+                                              EHCI_TOKEN_STATUS_HALTED);
+
+    }
+}
+
+VOID
+NTAPI
+EHCI_PollAsyncEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                       IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    PEHCI_HCD_QH QH;
+    PLIST_ENTRY DoneList;
+    PEHCI_HCD_TD TD;
+
+    //DPRINT_EHCI("EHCI_PollAsyncEndpoint: EhciEndpoint - %p\n", EhciEndpoint);
+
+    if (!EhciEndpoint->PendingTDs)
+        return;
+
+    QH = EhciEndpoint->QH;
+
+    if (QH->sqh.QhFlags & EHCI_QH_FLAG_CLOSED)
+        return;
+
+    if (QH->sqh.HwQH.Token.Status & EHCI_TOKEN_STATUS_ACTIVE ||
+        !(QH->sqh.HwQH.Token.Status & EHCI_TOKEN_STATUS_HALTED))
+    {
+        EHCI_PollActiveAsyncEndpoint(EhciExtension, EhciEndpoint);
+    }
+    else
+    {
+        EhciEndpoint->EndpointStatus |= USBPORT_ENDPOINT_HALT;
+        EHCI_PollHaltedAsyncEndpoint(EhciExtension, EhciEndpoint);
+    }
+
+    DoneList = &EhciEndpoint->ListTDs;
+
+    while (!IsListEmpty(DoneList))
+    {
+        TD = CONTAINING_RECORD(DoneList->Flink,
+                               EHCI_HCD_TD,
+                               DoneLink);
+
+        RemoveHeadList(DoneList);
+
+        ASSERT((TD->TdFlags & (EHCI_HCD_TD_FLAG_PROCESSED |
+                               EHCI_HCD_TD_FLAG_DONE)));
+
+        EHCI_ProcessDoneAsyncTd(EhciExtension, TD);
+    }
+}
+
+VOID
+NTAPI
+EHCI_PollIsoEndpoint(IN PEHCI_EXTENSION EhciExtension,
+                     IN PEHCI_ENDPOINT EhciEndpoint)
+{
+    DPRINT1("EHCI_PollIsoEndpoint: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_PollEndpoint(IN PVOID ehciExtension,
+                  IN PVOID ehciEndpoint)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_ENDPOINT EhciEndpoint = ehciEndpoint;
+    ULONG TransferType;
+
+    //DPRINT_EHCI("EHCI_PollEndpoint: EhciEndpoint - %p\n", EhciEndpoint);
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS)
+        EHCI_PollIsoEndpoint(EhciExtension, EhciEndpoint);
+    else
+        EHCI_PollAsyncEndpoint(EhciExtension, EhciEndpoint);
+}
+
+VOID
+NTAPI
+EHCI_CheckController(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+
+    //DPRINT_EHCI("EHCI_CheckController: ... \n");
+
+    if (EhciExtension->IsStarted)
+        EHCI_HardwarePresent(EhciExtension, TRUE);
+}
+
+ULONG
+NTAPI
+EHCI_Get32BitFrameNumber(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    ULONG FrameIdx;
+    ULONG FrameIndex;
+    ULONG FrameNumber;
+
+    //DPRINT_EHCI("EHCI_Get32BitFrameNumber: EhciExtension - %p\n", EhciExtension);
+
+    FrameIdx = EhciExtension->FrameIndex;
+    FrameIndex = READ_REGISTER_ULONG(&EhciExtension->OperationalRegs->FrameIndex);
+
+    FrameNumber = (USHORT)FrameIdx ^ ((FrameIndex / EHCI_MICROFRAMES) & EHCI_FRINDEX_FRAME_MASK);
+    FrameNumber &= EHCI_FRAME_LIST_MAX_ENTRIES;
+    FrameNumber += FrameIndex | ((FrameIndex / EHCI_MICROFRAMES) & EHCI_FRINDEX_INDEX_MASK);
+
+    return FrameNumber;
+}
+
+VOID
+NTAPI
+EHCI_EnableInterrupts(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+
+    DPRINT("EHCI_EnableInterrupts: EhciExtension->InterruptMask - %x\n",
+           EhciExtension->InterruptMask.AsULONG);
+
+    WRITE_REGISTER_ULONG(&EhciExtension->OperationalRegs->HcInterruptEnable.AsULONG,
+                         EhciExtension->InterruptMask.AsULONG);
+}
+
+VOID
+NTAPI
+EHCI_DisableInterrupts(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+
+    DPRINT("EHCI_DisableInterrupts: ... \n");
+
+    WRITE_REGISTER_ULONG(&EhciExtension->OperationalRegs->HcInterruptEnable.AsULONG,
+                         0);
+}
+
+VOID
+NTAPI
+EHCI_PollController(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    ULONG Port;
+    EHCI_PORT_STATUS_CONTROL PortSC;
+
+    DPRINT_EHCI("EHCI_PollController: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    if (!(EhciExtension->Flags & EHCI_FLAGS_CONTROLLER_SUSPEND))
+    {
+        RegPacket.UsbPortInvalidateRootHub(EhciExtension);
+        return;
+    }
+
+    if (EhciExtension->NumberOfPorts)
+    {
+        for (Port = 0; Port < EhciExtension->NumberOfPorts; Port++)
+        {
+            PortSC.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->PortControl[Port].AsULONG);
+
+            if (PortSC.ConnectStatusChange)
+                RegPacket.UsbPortInvalidateRootHub(EhciExtension);
+        }
+    }
+}
+
+VOID
+NTAPI
+EHCI_SetEndpointDataToggle(IN PVOID ehciExtension,
+                           IN PVOID ehciEndpoint,
+                           IN ULONG DataToggle)
+{
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG TransferType;
+
+    EhciEndpoint = ehciEndpoint;
+
+    DPRINT("EHCI_SetEndpointDataToggle: EhciEndpoint - %p, DataToggle - %x\n",
+                EhciEndpoint,
+                DataToggle);
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_BULK ||
+        TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+    {
+        EhciEndpoint->QH->sqh.HwQH.Token.DataToggle = DataToggle;
+    }
+}
+
+ULONG
+NTAPI
+EHCI_GetEndpointStatus(IN PVOID ehciExtension,
+                       IN PVOID ehciEndpoint)
+{
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG TransferType;
+    ULONG EndpointStatus = USBPORT_ENDPOINT_RUN;
+
+    EhciEndpoint = ehciEndpoint;
+
+    DPRINT("EHCI_GetEndpointStatus: EhciEndpoint - %p\n", EhciEndpoint);
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS)
+        return EndpointStatus;
+
+    if (EhciEndpoint->EndpointStatus & USBPORT_ENDPOINT_HALT)
+        EndpointStatus = USBPORT_ENDPOINT_HALT;
+
+    return EndpointStatus;
+}
+
+VOID
+NTAPI
+EHCI_SetEndpointStatus(IN PVOID ehciExtension,
+                       IN PVOID ehciEndpoint,
+                       IN ULONG EndpointStatus)
+{
+    PEHCI_ENDPOINT EhciEndpoint;
+    ULONG TransferType;
+    PEHCI_HCD_QH QH;
+
+    EhciEndpoint = ehciEndpoint;
+
+    DPRINT("EHCI_SetEndpointStatus: EhciEndpoint - %p, EndpointStatus - %x\n",
+                EhciEndpoint,
+                EndpointStatus);
+
+    TransferType = EhciEndpoint->EndpointProperties.TransferType;
+
+    if (TransferType != USBPORT_TRANSFER_TYPE_ISOCHRONOUS)
+    {
+
+        if (EndpointStatus == USBPORT_ENDPOINT_RUN)
+        {
+            EhciEndpoint->EndpointStatus &= ~USBPORT_ENDPOINT_HALT;
+
+            QH = EhciEndpoint->QH;
+            QH->sqh.HwQH.Token.Status &= (UCHAR)~EHCI_TOKEN_STATUS_HALTED;
+
+            return;
+        }
+
+        if (EndpointStatus == USBPORT_ENDPOINT_HALT)
+            DbgBreakPoint();
+    }
+}
+
+VOID
+NTAPI
+EHCI_ResetController(IN PVOID ehciExtension)
+{
+    DPRINT1("EHCI_ResetController: UNIMPLEMENTED. FIXME\n");
+}
+
+MPSTATUS
+NTAPI
+EHCI_StartSendOnePacket(IN PVOID ehciExtension,
+                        IN PVOID PacketParameters,
+                        IN PVOID Data,
+                        IN PULONG pDataLength,
+                        IN PVOID BufferVA,
+                        IN PVOID BufferPA,
+                        IN ULONG BufferLength,
+                        IN USBD_STATUS * pUSBDStatus)
+{
+    DPRINT1("EHCI_StartSendOnePacket: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_EndSendOnePacket(IN PVOID ehciExtension,
+                      IN PVOID PacketParameters,
+                      IN PVOID Data,
+                      IN PULONG pDataLength,
+                      IN PVOID BufferVA,
+                      IN PVOID BufferPA,
+                      IN ULONG BufferLength,
+                      IN USBD_STATUS * pUSBDStatus)
+{
+    DPRINT1("EHCI_EndSendOnePacket: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_SUCCESS;
+}
+
+MPSTATUS
+NTAPI
+EHCI_PassThru(IN PVOID ehciExtension,
+              IN PVOID passThruParameters,
+              IN ULONG ParameterLength,
+              IN PVOID pParameters)
+{
+    DPRINT1("EHCI_PassThru: UNIMPLEMENTED. FIXME\n");
+    return MP_STATUS_SUCCESS;
+}
+
+VOID
+NTAPI
+EHCI_RebalanceEndpoint(IN PVOID ohciExtension,
+                       IN PUSBPORT_ENDPOINT_PROPERTIES EndpointProperties,
+                       IN PVOID ohciEndpoint)
+{
+    DPRINT1("EHCI_RebalanceEndpoint: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_FlushInterrupts(IN PVOID ehciExtension)
+{
+    PEHCI_EXTENSION EhciExtension = ehciExtension;
+    PEHCI_HW_REGISTERS OperationalRegs;
+    EHCI_USB_STATUS Status;
+
+    DPRINT("EHCI_FlushInterrupts: ... \n");
+
+    OperationalRegs = EhciExtension->OperationalRegs;
+
+    Status.AsULONG = READ_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG);
+    WRITE_REGISTER_ULONG(&OperationalRegs->HcStatus.AsULONG, Status.AsULONG);
+}
+
+VOID
+NTAPI
+EHCI_TakePortControl(IN PVOID ohciExtension)
+{
+    DPRINT1("EHCI_TakePortControl: UNIMPLEMENTED. FIXME\n");
+}
+
+VOID
+NTAPI
+EHCI_Unload(IN PDRIVER_OBJECT DriverObject)
+{
+#if DBG
+    DPRINT1("EHCI_Unload: Not supported\n");
+#endif
+    return;
+}
+
+NTSTATUS
+NTAPI
+DriverEntry(IN PDRIVER_OBJECT DriverObject,
+            IN PUNICODE_STRING RegistryPath)
+{
+    DPRINT("DriverEntry: DriverObject - %p, RegistryPath - %wZ\n",
+           DriverObject,
+           RegistryPath);
+
+    if (USBPORT_GetHciMn() != USBPORT_HCI_MN)
+        return STATUS_INSUFFICIENT_RESOURCES;
+
+    RtlZeroMemory(&RegPacket, sizeof(USBPORT_REGISTRATION_PACKET));
+
+    RegPacket.MiniPortVersion = USB_MINIPORT_VERSION_EHCI;
+
+    RegPacket.MiniPortFlags = USB_MINIPORT_FLAGS_INTERRUPT |
+                              USB_MINIPORT_FLAGS_MEMORY_IO |
+                              USB_MINIPORT_FLAGS_USB2 |
+                              USB_MINIPORT_FLAGS_POLLING |
+                              USB_MINIPORT_FLAGS_WAKE_SUPPORT;
+
+    RegPacket.MiniPortBusBandwidth = TOTAL_USB20_BUS_BANDWIDTH;
+
+    RegPacket.MiniPortExtensionSize = sizeof(EHCI_EXTENSION);
+    RegPacket.MiniPortEndpointSize = sizeof(EHCI_ENDPOINT);
+    RegPacket.MiniPortTransferSize = sizeof(EHCI_TRANSFER);
+    RegPacket.MiniPortResourcesSize = sizeof(EHCI_HC_RESOURCES);
+
+    RegPacket.OpenEndpoint = EHCI_OpenEndpoint;
+    RegPacket.ReopenEndpoint = EHCI_ReopenEndpoint;
+    RegPacket.QueryEndpointRequirements = EHCI_QueryEndpointRequirements;
+    RegPacket.CloseEndpoint = EHCI_CloseEndpoint;
+    RegPacket.StartController = EHCI_StartController;
+    RegPacket.StopController = EHCI_StopController;
+    RegPacket.SuspendController = EHCI_SuspendController;
+    RegPacket.ResumeController = EHCI_ResumeController;
+    RegPacket.InterruptService = EHCI_InterruptService;
+    RegPacket.InterruptDpc = EHCI_InterruptDpc;
+    RegPacket.SubmitTransfer = EHCI_SubmitTransfer;
+    RegPacket.SubmitIsoTransfer = EHCI_SubmitIsoTransfer;
+    RegPacket.AbortTransfer = EHCI_AbortTransfer;
+    RegPacket.GetEndpointState = EHCI_GetEndpointState;
+    RegPacket.SetEndpointState = EHCI_SetEndpointState;
+    RegPacket.PollEndpoint = EHCI_PollEndpoint;
+    RegPacket.CheckController = EHCI_CheckController;
+    RegPacket.Get32BitFrameNumber = EHCI_Get32BitFrameNumber;
+    RegPacket.InterruptNextSOF = EHCI_InterruptNextSOF;
+    RegPacket.EnableInterrupts = EHCI_EnableInterrupts;
+    RegPacket.DisableInterrupts = EHCI_DisableInterrupts;
+    RegPacket.PollController = EHCI_PollController;
+    RegPacket.SetEndpointDataToggle = EHCI_SetEndpointDataToggle;
+    RegPacket.GetEndpointStatus = EHCI_GetEndpointStatus;
+    RegPacket.SetEndpointStatus = EHCI_SetEndpointStatus;
+    RegPacket.RH_GetRootHubData = EHCI_RH_GetRootHubData;
+    RegPacket.RH_GetStatus = EHCI_RH_GetStatus;
+    RegPacket.RH_GetPortStatus = EHCI_RH_GetPortStatus;
+    RegPacket.RH_GetHubStatus = EHCI_RH_GetHubStatus;
+    RegPacket.RH_SetFeaturePortReset = EHCI_RH_SetFeaturePortReset;
+    RegPacket.RH_SetFeaturePortPower = EHCI_RH_SetFeaturePortPower;
+    RegPacket.RH_SetFeaturePortEnable = EHCI_RH_SetFeaturePortEnable;
+    RegPacket.RH_SetFeaturePortSuspend = EHCI_RH_SetFeaturePortSuspend;
+    RegPacket.RH_ClearFeaturePortEnable = EHCI_RH_ClearFeaturePortEnable;
+    RegPacket.RH_ClearFeaturePortPower = EHCI_RH_ClearFeaturePortPower;
+    RegPacket.RH_ClearFeaturePortSuspend = EHCI_RH_ClearFeaturePortSuspend;
+    RegPacket.RH_ClearFeaturePortEnableChange = EHCI_RH_ClearFeaturePortEnableChange;
+    RegPacket.RH_ClearFeaturePortConnectChange = EHCI_RH_ClearFeaturePortConnectChange;
+    RegPacket.RH_ClearFeaturePortResetChange = EHCI_RH_ClearFeaturePortResetChange;
+    RegPacket.RH_ClearFeaturePortSuspendChange = EHCI_RH_ClearFeaturePortSuspendChange;
+    RegPacket.RH_ClearFeaturePortOvercurrentChange = EHCI_RH_ClearFeaturePortOvercurrentChange;
+    RegPacket.RH_DisableIrq = EHCI_RH_DisableIrq;
+    RegPacket.RH_EnableIrq = EHCI_RH_EnableIrq;
+    RegPacket.StartSendOnePacket = EHCI_StartSendOnePacket;
+    RegPacket.EndSendOnePacket = EHCI_EndSendOnePacket;
+    RegPacket.PassThru = EHCI_PassThru;
+    RegPacket.RebalanceEndpoint = EHCI_RebalanceEndpoint;
+    RegPacket.FlushInterrupts = EHCI_FlushInterrupts;
+    RegPacket.RH_ChirpRootPort = EHCI_RH_ChirpRootPort;
+    RegPacket.TakePortControl = EHCI_TakePortControl;
+
+    DriverObject->DriverUnload = EHCI_Unload;
+
+    return USBPORT_RegisterUSBPortDriver(DriverObject,
+                                         USB20_MINIPORT_INTERFACE_VERSION,
+                                         &RegPacket);
+}