/** @file

  The EHCI register operation routines.

Copyright (c) 2007 - 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "Ehci.h"

/**
  Read EHCI capability register.

  @param  Ehc          The EHCI device.
  @param  Offset       Capability register address.

  @return The register content read.
  @retval If err, return 0xffff.

**/
UINT32
EhcReadCapRegister (
  IN  USB2_HC_DEV  *Ehc,
  IN  UINT32       Offset
  )
{
  UINT32      Data;
  EFI_STATUS  Status;

  Status = Ehc->PciIo->Mem.Read (
                             Ehc->PciIo,
                             EfiPciIoWidthUint32,
                             EHC_BAR_INDEX,
                             (UINT64)Offset,
                             1,
                             &Data
                             );

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcReadCapRegister: Pci Io read error - %r at %d\n", Status, Offset));
    Data = 0xFFFF;
  }

  return Data;
}

/**
  Read EHCI debug port register.

  @param  Ehc          The EHCI device.
  @param  Offset       Debug port register offset.

  @return The register content read.
  @retval If err, return 0xffff.

**/
UINT32
EhcReadDbgRegister (
  IN  CONST USB2_HC_DEV  *Ehc,
  IN  UINT32             Offset
  )
{
  UINT32      Data;
  EFI_STATUS  Status;

  Status = Ehc->PciIo->Mem.Read (
                             Ehc->PciIo,
                             EfiPciIoWidthUint32,
                             Ehc->DebugPortBarNum,
                             Ehc->DebugPortOffset + Offset,
                             1,
                             &Data
                             );

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcReadDbgRegister: Pci Io read error - %r at %d\n", Status, Offset));
    Data = 0xFFFF;
  }

  return Data;
}

/**
  Check whether the host controller has an in-use debug port.

  @param[in] Ehc         The Enhanced Host Controller to query.

  @param[in] PortNumber  If PortNumber is not NULL, then query whether
                         PortNumber is an in-use debug port on Ehc. (PortNumber
                         is taken in UEFI notation, i.e., zero-based.)
                         Otherwise, query whether Ehc has any in-use debug
                         port.

  @retval TRUE   PortNumber is an in-use debug port on Ehc (if PortNumber is
                 not NULL), or some port on Ehc is an in-use debug port
                 (otherwise).

  @retval FALSE  PortNumber is not an in-use debug port on Ehc (if PortNumber
                 is not NULL), or no port on Ehc is an in-use debug port
                 (otherwise).
**/
BOOLEAN
EhcIsDebugPortInUse (
  IN CONST USB2_HC_DEV  *Ehc,
  IN CONST UINT8        *PortNumber OPTIONAL
  )
{
  UINT32  State;

  if (Ehc->DebugPortNum == 0) {
    //
    // The host controller has no debug port.
    //
    return FALSE;
  }

  //
  // The Debug Port Number field in HCSPARAMS is one-based.
  //
  if ((PortNumber != NULL) && (*PortNumber != Ehc->DebugPortNum - 1)) {
    //
    // The caller specified a port, but it's not the debug port of the host
    // controller.
    //
    return FALSE;
  }

  //
  // Deduce usage from the Control Register.
  //
  State = EhcReadDbgRegister (Ehc, 0);
  return (State & USB_DEBUG_PORT_IN_USE_MASK) == USB_DEBUG_PORT_IN_USE_MASK;
}

/**
  Read EHCI Operation register.

  @param  Ehc          The EHCI device.
  @param  Offset       The operation register offset.

  @return The register content read.
  @retval If err, return 0xffff.

**/
UINT32
EhcReadOpReg (
  IN  USB2_HC_DEV  *Ehc,
  IN  UINT32       Offset
  )
{
  UINT32      Data;
  EFI_STATUS  Status;

  ASSERT (Ehc->CapLen != 0);

  Status = Ehc->PciIo->Mem.Read (
                             Ehc->PciIo,
                             EfiPciIoWidthUint32,
                             EHC_BAR_INDEX,
                             Ehc->CapLen + Offset,
                             1,
                             &Data
                             );

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcReadOpReg: Pci Io Read error - %r at %d\n", Status, Offset));
    Data = 0xFFFF;
  }

  return Data;
}

/**
  Write  the data to the EHCI operation register.

  @param  Ehc          The EHCI device.
  @param  Offset       EHCI operation register offset.
  @param  Data         The data to write.

**/
VOID
EhcWriteOpReg (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Offset,
  IN UINT32       Data
  )
{
  EFI_STATUS  Status;

  ASSERT (Ehc->CapLen != 0);

  Status = Ehc->PciIo->Mem.Write (
                             Ehc->PciIo,
                             EfiPciIoWidthUint32,
                             EHC_BAR_INDEX,
                             Ehc->CapLen + Offset,
                             1,
                             &Data
                             );

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcWriteOpReg: Pci Io Write error: %r at %d\n", Status, Offset));
  }
}

/**
  Set one bit of the operational register while keeping other bits.

  @param  Ehc          The EHCI device.
  @param  Offset       The offset of the operational register.
  @param  Bit          The bit mask of the register to set.

**/
VOID
EhcSetOpRegBit (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Offset,
  IN UINT32       Bit
  )
{
  UINT32  Data;

  Data  = EhcReadOpReg (Ehc, Offset);
  Data |= Bit;
  EhcWriteOpReg (Ehc, Offset, Data);
}

/**
  Clear one bit of the operational register while keeping other bits.

  @param  Ehc          The EHCI device.
  @param  Offset       The offset of the operational register.
  @param  Bit          The bit mask of the register to clear.

**/
VOID
EhcClearOpRegBit (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Offset,
  IN UINT32       Bit
  )
{
  UINT32  Data;

  Data  = EhcReadOpReg (Ehc, Offset);
  Data &= ~Bit;
  EhcWriteOpReg (Ehc, Offset, Data);
}

/**
  Wait the operation register's bit as specified by Bit
  to become set (or clear).

  @param  Ehc          The EHCI device.
  @param  Offset       The offset of the operation register.
  @param  Bit          The bit of the register to wait for.
  @param  WaitToSet    Wait the bit to set or clear.
  @param  Timeout      The time to wait before abort (in millisecond).

  @retval EFI_SUCCESS  The bit successfully changed by host controller.
  @retval EFI_TIMEOUT  The time out occurred.

**/
EFI_STATUS
EhcWaitOpRegBit (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Offset,
  IN UINT32       Bit,
  IN BOOLEAN      WaitToSet,
  IN UINT32       Timeout
  )
{
  UINT32  Index;

  for (Index = 0; Index < Timeout / EHC_SYNC_POLL_INTERVAL + 1; Index++) {
    if (EHC_REG_BIT_IS_SET (Ehc, Offset, Bit) == WaitToSet) {
      return EFI_SUCCESS;
    }

    gBS->Stall (EHC_SYNC_POLL_INTERVAL);
  }

  return EFI_TIMEOUT;
}

/**
  Add support for UEFI Over Legacy (UoL) feature, stop
  the legacy USB SMI support.

  @param  Ehc          The EHCI device.

**/
VOID
EhcClearLegacySupport (
  IN USB2_HC_DEV  *Ehc
  )
{
  UINT32               ExtendCap;
  EFI_PCI_IO_PROTOCOL  *PciIo;
  UINT32               Value;
  UINT32               TimeOut;

  DEBUG ((DEBUG_INFO, "EhcClearLegacySupport: called to clear legacy support\n"));

  PciIo     = Ehc->PciIo;
  ExtendCap = (Ehc->HcCapParams >> 8) & 0xFF;

  PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);
  PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap + 0x4, 1, &Value);

  PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);
  Value |= (0x1 << 24);
  PciIo->Pci.Write (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);

  TimeOut = 40;
  while (TimeOut-- != 0) {
    gBS->Stall (500);

    PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);

    if ((Value & 0x01010000) == 0x01000000) {
      break;
    }
  }

  PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);
  PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap + 0x4, 1, &Value);
}

/**
  Set door bell and wait it to be ACKed by host controller.
  This function is used to synchronize with the hardware.

  @param  Ehc          The EHCI device.
  @param  Timeout      The time to wait before abort (in millisecond, ms).

  @retval EFI_SUCCESS  Synchronized with the hardware.
  @retval EFI_TIMEOUT  Time out happened while waiting door bell to set.

**/
EFI_STATUS
EhcSetAndWaitDoorBell (
  IN  USB2_HC_DEV  *Ehc,
  IN  UINT32       Timeout
  )
{
  EFI_STATUS  Status;
  UINT32      Data;

  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_IAAD);

  Status = EhcWaitOpRegBit (Ehc, EHC_USBSTS_OFFSET, USBSTS_IAA, TRUE, Timeout);

  //
  // ACK the IAA bit in USBSTS register. Make sure other
  // interrupt bits are not ACKed. These bits are WC (Write Clean).
  //
  Data  = EhcReadOpReg (Ehc, EHC_USBSTS_OFFSET);
  Data &= ~USBSTS_INTACK_MASK;
  Data |= USBSTS_IAA;

  EhcWriteOpReg (Ehc, EHC_USBSTS_OFFSET, Data);

  return Status;
}

/**
  Clear all the interrutp status bits, these bits
  are Write-Clean.

  @param  Ehc          The EHCI device.

**/
VOID
EhcAckAllInterrupt (
  IN  USB2_HC_DEV  *Ehc
  )
{
  EhcWriteOpReg (Ehc, EHC_USBSTS_OFFSET, USBSTS_INTACK_MASK);
}

/**
  Enable the periodic schedule then wait EHC to
  actually enable it.

  @param  Ehc          The EHCI device.
  @param  Timeout      The time to wait before abort (in millisecond, ms).

  @retval EFI_SUCCESS  The periodical schedule is enabled.
  @retval EFI_TIMEOUT  Time out happened while enabling periodic schedule.

**/
EFI_STATUS
EhcEnablePeriodSchd (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Timeout
  )
{
  EFI_STATUS  Status;

  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_ENABLE_PERIOD);

  Status = EhcWaitOpRegBit (Ehc, EHC_USBSTS_OFFSET, USBSTS_PERIOD_ENABLED, TRUE, Timeout);
  return Status;
}

/**
  Enable asynchrounous schedule.

  @param  Ehc          The EHCI device.
  @param  Timeout      Time to wait before abort.

  @retval EFI_SUCCESS  The EHCI asynchronous schedule is enabled.
  @return Others       Failed to enable the asynchronous scheudle.

**/
EFI_STATUS
EhcEnableAsyncSchd (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Timeout
  )
{
  EFI_STATUS  Status;

  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_ENABLE_ASYNC);

  Status = EhcWaitOpRegBit (Ehc, EHC_USBSTS_OFFSET, USBSTS_ASYNC_ENABLED, TRUE, Timeout);
  return Status;
}

/**
  Whether Ehc is halted.

  @param  Ehc          The EHCI device.

  @retval TRUE         The controller is halted.
  @retval FALSE        It isn't halted.

**/
BOOLEAN
EhcIsHalt (
  IN USB2_HC_DEV  *Ehc
  )
{
  return EHC_REG_BIT_IS_SET (Ehc, EHC_USBSTS_OFFSET, USBSTS_HALT);
}

/**
  Whether system error occurred.

  @param  Ehc          The EHCI device.

  @return TRUE         System error happened.
  @return FALSE        No system error.

**/
BOOLEAN
EhcIsSysError (
  IN USB2_HC_DEV  *Ehc
  )
{
  return EHC_REG_BIT_IS_SET (Ehc, EHC_USBSTS_OFFSET, USBSTS_SYS_ERROR);
}

/**
  Reset the host controller.

  @param  Ehc          The EHCI device.
  @param  Timeout      Time to wait before abort (in millisecond, ms).

  @retval EFI_SUCCESS  The host controller is reset.
  @return Others       Failed to reset the host.

**/
EFI_STATUS
EhcResetHC (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Timeout
  )
{
  EFI_STATUS  Status;

  //
  // Host can only be reset when it is halt. If not so, halt it
  //
  if (!EHC_REG_BIT_IS_SET (Ehc, EHC_USBSTS_OFFSET, USBSTS_HALT)) {
    Status = EhcHaltHC (Ehc, Timeout);

    if (EFI_ERROR (Status)) {
      return Status;
    }
  }

  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_RESET);
  Status = EhcWaitOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_RESET, FALSE, Timeout);
  return Status;
}

/**
  Halt the host controller.

  @param  Ehc          The EHCI device.
  @param  Timeout      Time to wait before abort.

  @retval EFI_SUCCESS  The EHCI is halt.
  @retval EFI_TIMEOUT  Failed to halt the controller before Timeout.

**/
EFI_STATUS
EhcHaltHC (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Timeout
  )
{
  EFI_STATUS  Status;

  EhcClearOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_RUN);
  Status = EhcWaitOpRegBit (Ehc, EHC_USBSTS_OFFSET, USBSTS_HALT, TRUE, Timeout);
  return Status;
}

/**
  Set the EHCI to run.

  @param  Ehc          The EHCI device.
  @param  Timeout      Time to wait before abort.

  @retval EFI_SUCCESS  The EHCI is running.
  @return Others       Failed to set the EHCI to run.

**/
EFI_STATUS
EhcRunHC (
  IN USB2_HC_DEV  *Ehc,
  IN UINT32       Timeout
  )
{
  EFI_STATUS  Status;

  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_RUN);
  Status = EhcWaitOpRegBit (Ehc, EHC_USBSTS_OFFSET, USBSTS_HALT, FALSE, Timeout);
  return Status;
}

/**
  Initialize the HC hardware.
  EHCI spec lists the five things to do to initialize the hardware:
  1. Program CTRLDSSEGMENT
  2. Set USBINTR to enable interrupts
  3. Set periodic list base
  4. Set USBCMD, interrupt threshold, frame list size etc
  5. Write 1 to CONFIGFLAG to route all ports to EHCI

  @param  Ehc          The EHCI device.

  @return EFI_SUCCESS  The EHCI has come out of halt state.
  @return EFI_TIMEOUT  Time out happened.

**/
EFI_STATUS
EhcInitHC (
  IN USB2_HC_DEV  *Ehc
  )
{
  EFI_STATUS  Status;
  UINT32      Index;
  UINT32      RegVal;

  // This ASSERT crashes the BeagleBoard. There is some issue in the USB stack.
  // This ASSERT needs to be removed so the BeagleBoard will boot. When we fix
  // the USB stack we can put this ASSERT back in
  // ASSERT (EhcIsHalt (Ehc));

  //
  // Allocate the periodic frame and associated memeory
  // management facilities if not already done.
  //
  if (Ehc->PeriodFrame != NULL) {
    EhcFreeSched (Ehc);
  }

  Status = EhcInitSched (Ehc);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // 1. Clear USBINTR to disable all the interrupt. UEFI works by polling
  //
  EhcWriteOpReg (Ehc, EHC_USBINTR_OFFSET, 0);

  //
  // 2. Start the Host Controller
  //
  EhcSetOpRegBit (Ehc, EHC_USBCMD_OFFSET, USBCMD_RUN);

  //
  // 3. Power up all ports if EHCI has Port Power Control (PPC) support
  //
  if (Ehc->HcStructParams & HCSP_PPC) {
    for (Index = 0; Index < (UINT8)(Ehc->HcStructParams & HCSP_NPORTS); Index++) {
      //
      // Do not clear port status bits on initialization.  Otherwise devices will
      // not enumerate properly at startup.
      //
      RegVal  = EhcReadOpReg (Ehc, (UINT32)(EHC_PORT_STAT_OFFSET + (4 * Index)));
      RegVal &= ~PORTSC_CHANGE_MASK;
      RegVal |= PORTSC_POWER;
      EhcWriteOpReg (Ehc, (UINT32)(EHC_PORT_STAT_OFFSET + (4 * Index)), RegVal);
    }
  }

  //
  // Wait roothub port power stable
  //
  gBS->Stall (EHC_ROOT_PORT_RECOVERY_STALL);

  //
  // 4. Set all ports routing to EHC
  //
  EhcSetOpRegBit (Ehc, EHC_CONFIG_FLAG_OFFSET, CONFIGFLAG_ROUTE_EHC);

  Status = EhcEnablePeriodSchd (Ehc, EHC_GENERIC_TIMEOUT);

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcInitHC: failed to enable period schedule\n"));
    return Status;
  }

  Status = EhcEnableAsyncSchd (Ehc, EHC_GENERIC_TIMEOUT);

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "EhcInitHC: failed to enable async schedule\n"));
    return Status;
  }

  return EFI_SUCCESS;
}