system76-edk2/MdeModulePkg/Bus/Pci/EhciPei/EhciSched.c

/** @file
PEIM to produce gPeiUsb2HostControllerPpiGuid based on gPeiUsbControllerPpiGuid
which is used to enable recovery function from USB Drivers.

Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "EhcPeim.h"

/**
  Create helper QTD/QH for the EHCI device.

  @param  Ehc         The EHCI device.

  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource for helper QTD/QH.
  @retval EFI_SUCCESS           Helper QH/QTD are created.

**/
EFI_STATUS
EhcCreateHelpQ (
  IN PEI_USB2_HC_DEV  *Ehc
  )
{
  USB_ENDPOINT  Ep;
  PEI_EHC_QH    *Qh;
  QH_HW         *QhHw;
  PEI_EHC_QTD   *Qtd;

  //
  // Create an inactive Qtd to terminate the short packet read.
  //
  Qtd = EhcCreateQtd (Ehc, NULL, 0, QTD_PID_INPUT, 0, 64);

  if (Qtd == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Qtd->QtdHw.Status  = QTD_STAT_HALTED;
  Ehc->ShortReadStop = Qtd;

  //
  // Create a QH to act as the EHC reclamation header.
  // Set the header to loopback to itself.
  //
  Ep.DevAddr   = 0;
  Ep.EpAddr    = 1;
  Ep.Direction = EfiUsbDataIn;
  Ep.DevSpeed  = EFI_USB_SPEED_HIGH;
  Ep.MaxPacket = 64;
  Ep.HubAddr   = 0;
  Ep.HubPort   = 0;
  Ep.Toggle    = 0;
  Ep.Type      = EHC_BULK_TRANSFER;
  Ep.PollRate  = 1;

  Qh = EhcCreateQh (Ehc, &Ep);

  if (Qh == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  QhHw              = &Qh->QhHw;
  QhHw->HorizonLink = QH_LINK (QhHw, EHC_TYPE_QH, FALSE);
  QhHw->Status      = QTD_STAT_HALTED;
  QhHw->ReclaimHead = 1;
  Ehc->ReclaimHead  = Qh;

  //
  // Create a dummy QH to act as the terminator for periodical schedule
  //
  Ep.EpAddr = 2;
  Ep.Type   = EHC_INT_TRANSFER_SYNC;

  Qh = EhcCreateQh (Ehc, &Ep);

  if (Qh == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Qh->QhHw.Status = QTD_STAT_HALTED;
  Ehc->PeriodOne  = Qh;

  return EFI_SUCCESS;
}

/**
  Initialize the schedule data structure such as frame list.

  @param  Ehc                   The EHCI device to init schedule data for.

  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource to init schedule data.
  @retval EFI_SUCCESS           The schedule data is initialized.

**/
EFI_STATUS
EhcInitSched (
  IN PEI_USB2_HC_DEV  *Ehc
  )
{
  VOID                  *Buf;
  EFI_PHYSICAL_ADDRESS  PhyAddr;
  VOID                  *Map;
  UINTN                 Index;
  UINT32                *Desc;
  EFI_STATUS            Status;
  EFI_PHYSICAL_ADDRESS  PciAddr;

  //
  // First initialize the periodical schedule data:
  // 1. Allocate and map the memory for the frame list
  // 2. Create the help QTD/QH
  // 3. Initialize the frame entries
  // 4. Set the frame list register
  //
  //
  // The Frame List ocupies 4K bytes,
  // and must be aligned on 4-Kbyte boundaries.
  //
  Status = IoMmuAllocateBuffer (
             Ehc->IoMmu,
             1,
             &Buf,
             &PhyAddr,
             &Map
             );

  if (EFI_ERROR (Status) || (Buf == NULL)) {
    return EFI_OUT_OF_RESOURCES;
  }

  Ehc->PeriodFrame    = Buf;
  Ehc->PeriodFrameMap = Map;
  Ehc->High32bitAddr  = EHC_HIGH_32BIT (PhyAddr);

  //
  // Init memory pool management then create the helper
  // QTD/QH. If failed, previously allocated resources
  // will be freed by EhcFreeSched
  //
  Ehc->MemPool = UsbHcInitMemPool (
                   Ehc,
                   EHC_BIT_IS_SET (Ehc->HcCapParams, HCCP_64BIT),
                   Ehc->High32bitAddr
                   );

  if (Ehc->MemPool == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Status = EhcCreateHelpQ (Ehc);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Initialize the frame list entries then set the registers
  //
  Desc    = (UINT32 *)Ehc->PeriodFrame;
  PciAddr = UsbHcGetPciAddressForHostMem (Ehc->MemPool, Ehc->PeriodOne, sizeof (PEI_EHC_QH));
  for (Index = 0; Index < EHC_FRAME_LEN; Index++) {
    Desc[Index] = QH_LINK (PciAddr, EHC_TYPE_QH, FALSE);
  }

  EhcWriteOpReg (Ehc, EHC_FRAME_BASE_OFFSET, EHC_LOW_32BIT (PhyAddr));

  //
  // Second initialize the asynchronous schedule:
  // Only need to set the AsynListAddr register to
  // the reclamation header
  //
  PciAddr = UsbHcGetPciAddressForHostMem (Ehc->MemPool, Ehc->ReclaimHead, sizeof (PEI_EHC_QH));
  EhcWriteOpReg (Ehc, EHC_ASYNC_HEAD_OFFSET, EHC_LOW_32BIT (PciAddr));
  return EFI_SUCCESS;
}

/**
  Free the schedule data. It may be partially initialized.

  @param  Ehc   The EHCI device.

**/
VOID
EhcFreeSched (
  IN PEI_USB2_HC_DEV  *Ehc
  )
{
  EhcWriteOpReg (Ehc, EHC_FRAME_BASE_OFFSET, 0);
  EhcWriteOpReg (Ehc, EHC_ASYNC_HEAD_OFFSET, 0);

  if (Ehc->PeriodOne != NULL) {
    UsbHcFreeMem (Ehc, Ehc->MemPool, Ehc->PeriodOne, sizeof (PEI_EHC_QH));
    Ehc->PeriodOne = NULL;
  }

  if (Ehc->ReclaimHead != NULL) {
    UsbHcFreeMem (Ehc, Ehc->MemPool, Ehc->ReclaimHead, sizeof (PEI_EHC_QH));
    Ehc->ReclaimHead = NULL;
  }

  if (Ehc->ShortReadStop != NULL) {
    UsbHcFreeMem (Ehc, Ehc->MemPool, Ehc->ShortReadStop, sizeof (PEI_EHC_QTD));
    Ehc->ShortReadStop = NULL;
  }

  if (Ehc->MemPool != NULL) {
    UsbHcFreeMemPool (Ehc, Ehc->MemPool);
    Ehc->MemPool = NULL;
  }

  if (Ehc->PeriodFrame != NULL) {
    IoMmuFreeBuffer (Ehc->IoMmu, 1, Ehc->PeriodFrame, Ehc->PeriodFrameMap);
    Ehc->PeriodFrame = NULL;
  }
}

/**
  Link the queue head to the asynchronous schedule list.
  UEFI only supports one CTRL/BULK transfer at a time
  due to its interfaces. This simplifies the AsynList
  management: A reclamation header is always linked to
  the AsyncListAddr, the only active QH is appended to it.

  @param  Ehc   The EHCI device.
  @param  Qh    The queue head to link.

**/
VOID
EhcLinkQhToAsync (
  IN PEI_USB2_HC_DEV  *Ehc,
  IN PEI_EHC_QH       *Qh
  )
{
  PEI_EHC_QH  *Head;

  //
  // Append the queue head after the reclaim header, then
  // fix the hardware visiable parts (EHCI R1.0 page 72).
  // ReclaimHead is always linked to the EHCI's AsynListAddr.
  //
  Head = Ehc->ReclaimHead;

  Qh->NextQh   = Head->NextQh;
  Head->NextQh = Qh;

  Qh->QhHw.HorizonLink   = QH_LINK (Head, EHC_TYPE_QH, FALSE);
  Head->QhHw.HorizonLink = QH_LINK (Qh, EHC_TYPE_QH, FALSE);
}

/**
  Unlink a queue head from the asynchronous schedule list.
  Need to synchronize with hardware.

  @param  Ehc   The EHCI device.
  @param  Qh    The queue head to unlink.

**/
VOID
EhcUnlinkQhFromAsync (
  IN PEI_USB2_HC_DEV  *Ehc,
  IN PEI_EHC_QH       *Qh
  )
{
  PEI_EHC_QH  *Head;

  ASSERT (Ehc->ReclaimHead->NextQh == Qh);

  //
  // Remove the QH from reclamation head, then update the hardware
  // visiable part: Only need to loopback the ReclaimHead. The Qh
  // is pointing to ReclaimHead (which is staill in the list).
  //
  Head = Ehc->ReclaimHead;

  Head->NextQh = Qh->NextQh;
  Qh->NextQh   = NULL;

  Head->QhHw.HorizonLink = QH_LINK (Head, EHC_TYPE_QH, FALSE);

  //
  // Set and wait the door bell to synchronize with the hardware
  //
  EhcSetAndWaitDoorBell (Ehc, EHC_GENERIC_TIMEOUT);

  return;
}

/**
  Check the URB's execution result and update the URB's
  result accordingly.

  @param Ehc   The EHCI device.
  @param Urb   The URB to check result.

  @retval TRUE    URB transfer is finialized.
  @retval FALSE   URB transfer is not finialized.

**/
BOOLEAN
EhcCheckUrbResult (
  IN  PEI_USB2_HC_DEV  *Ehc,
  IN  PEI_URB          *Urb
  )
{
  EFI_LIST_ENTRY  *Entry;
  PEI_EHC_QTD     *Qtd;
  QTD_HW          *QtdHw;
  UINT8           State;
  BOOLEAN         Finished;

  ASSERT ((Ehc != NULL) && (Urb != NULL) && (Urb->Qh != NULL));

  Finished       = TRUE;
  Urb->Completed = 0;

  Urb->Result = EFI_USB_NOERROR;

  if (EhcIsHalt (Ehc) || EhcIsSysError (Ehc)) {
    Urb->Result |= EFI_USB_ERR_SYSTEM;
    goto ON_EXIT;
  }

  BASE_LIST_FOR_EACH (Entry, &Urb->Qh->Qtds) {
    Qtd   = EFI_LIST_CONTAINER (Entry, PEI_EHC_QTD, QtdList);
    QtdHw = &Qtd->QtdHw;
    State = (UINT8)QtdHw->Status;

    if (EHC_BIT_IS_SET (State, QTD_STAT_HALTED)) {
      //
      // EHCI will halt the queue head when met some error.
      // If it is halted, the result of URB is finialized.
      //
      if ((State & QTD_STAT_ERR_MASK) == 0) {
        Urb->Result |= EFI_USB_ERR_STALL;
      }

      if (EHC_BIT_IS_SET (State, QTD_STAT_BABBLE_ERR)) {
        Urb->Result |= EFI_USB_ERR_BABBLE;
      }

      if (EHC_BIT_IS_SET (State, QTD_STAT_BUFF_ERR)) {
        Urb->Result |= EFI_USB_ERR_BUFFER;
      }

      if (EHC_BIT_IS_SET (State, QTD_STAT_TRANS_ERR) && (QtdHw->ErrCnt == 0)) {
        Urb->Result |= EFI_USB_ERR_TIMEOUT;
      }

      Finished = TRUE;
      goto ON_EXIT;
    } else if (EHC_BIT_IS_SET (State, QTD_STAT_ACTIVE)) {
      //
      // The QTD is still active, no need to check furthur.
      //
      Urb->Result |= EFI_USB_ERR_NOTEXECUTE;

      Finished = FALSE;
      goto ON_EXIT;
    } else {
      //
      // This QTD is finished OK or met short packet read. Update the
      // transfer length if it isn't a setup.
      //
      if (QtdHw->Pid != QTD_PID_SETUP) {
        Urb->Completed += Qtd->DataLen - QtdHw->TotalBytes;
      }

      if ((QtdHw->TotalBytes != 0) && (QtdHw->Pid == QTD_PID_INPUT)) {
        // EHC_DUMP_QH ((Urb->Qh, "Short packet read", FALSE));

        //
        // Short packet read condition. If it isn't a setup transfer,
        // no need to check furthur: the queue head will halt at the
        // ShortReadStop. If it is a setup transfer, need to check the
        // Status Stage of the setup transfer to get the finial result
        //
        if (QtdHw->AltNext == QTD_LINK (Ehc->ShortReadStop, FALSE)) {
          Finished = TRUE;
          goto ON_EXIT;
        }
      }
    }
  }

ON_EXIT:
  //
  // Return the data toggle set by EHCI hardware, bulk and interrupt
  // transfer will use this to initialize the next transaction. For
  // Control transfer, it always start a new data toggle sequence for
  // new transfer.
  //
  // NOTICE: don't move DT update before the loop, otherwise there is
  // a race condition that DT is wrong.
  //
  Urb->DataToggle = (UINT8)Urb->Qh->QhHw.DataToggle;

  return Finished;
}

/**
  Execute the transfer by polling the URB. This is a synchronous operation.

  @param  Ehc               The EHCI device.
  @param  Urb               The URB to execute.
  @param  TimeOut           The time to wait before abort, in millisecond.

  @retval EFI_DEVICE_ERROR  The transfer failed due to transfer error.
  @retval EFI_TIMEOUT       The transfer failed due to time out.
  @retval EFI_SUCCESS       The transfer finished OK.

**/
EFI_STATUS
EhcExecTransfer (
  IN  PEI_USB2_HC_DEV  *Ehc,
  IN  PEI_URB          *Urb,
  IN  UINTN            TimeOut
  )
{
  EFI_STATUS  Status;
  UINTN       Index;
  UINTN       Loop;
  BOOLEAN     Finished;
  BOOLEAN     InfiniteLoop;

  Status       = EFI_SUCCESS;
  Loop         = TimeOut * EHC_1_MILLISECOND;
  Finished     = FALSE;
  InfiniteLoop = FALSE;

  //
  // If Timeout is 0, then the caller must wait for the function to be completed
  // until EFI_SUCCESS or EFI_DEVICE_ERROR is returned.
  //
  if (TimeOut == 0) {
    InfiniteLoop = TRUE;
  }

  for (Index = 0; InfiniteLoop || (Index < Loop); Index++) {
    Finished = EhcCheckUrbResult (Ehc, Urb);

    if (Finished) {
      break;
    }

    MicroSecondDelay (EHC_1_MICROSECOND);
  }

  if (!Finished) {
    Status = EFI_TIMEOUT;
  } else if (Urb->Result != EFI_USB_NOERROR) {
    Status = EFI_DEVICE_ERROR;
  }

  return Status;
}