text: /** @file
  
    Provides some data structure definitions used by the SD/MMC host controller driver.
  
  Copyright (c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
  Copyright (c) 2015 - 2020, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent
  
  **/
  
  #ifndef _SD_MMC_PCI_HC_DXE_H_
  #define _SD_MMC_PCI_HC_DXE_H_
  
  #include <Uefi.h>
  
  #include <IndustryStandard/Pci.h>
  #include <IndustryStandard/Emmc.h>
  #include <IndustryStandard/Sd.h>
  
  #include <Library/UefiDriverEntryPoint.h>
  #include <Library/DebugLib.h>
  #include <Library/UefiBootServicesTableLib.h>
  #include <Library/BaseMemoryLib.h>
  #include <Library/MemoryAllocationLib.h>
  #include <Library/UefiLib.h>
  #include <Library/DevicePathLib.h>
  #include <Library/PcdLib.h>
  
  #include <Protocol/DevicePath.h>
  #include <Protocol/PciIo.h>
  #include <Protocol/DriverBinding.h>
  #include <Protocol/ComponentName.h>
  #include <Protocol/ComponentName2.h>
  #include <Protocol/SdMmcOverride.h>
  #include <Protocol/SdMmcPassThru.h>
  
  #include "SdMmcPciHci.h"
  
  extern EFI_COMPONENT_NAME_PROTOCOL   gSdMmcPciHcComponentName;
  extern EFI_COMPONENT_NAME2_PROTOCOL  gSdMmcPciHcComponentName2;
  extern EFI_DRIVER_BINDING_PROTOCOL   gSdMmcPciHcDriverBinding;
  
  extern EDKII_SD_MMC_OVERRIDE  *mOverride;
  
  #define SD_MMC_HC_PRIVATE_SIGNATURE  SIGNATURE_32 ('s', 'd', 't', 'f')
  
  #define SD_MMC_HC_PRIVATE_FROM_THIS(a) \
      CR(a, SD_MMC_HC_PRIVATE_DATA, PassThru, SD_MMC_HC_PRIVATE_SIGNATURE)
  
  //
  // Generic time out value, 1 microsecond as unit.
  //
  #define SD_MMC_HC_GENERIC_TIMEOUT  (PcdGet32 (PcdSdMmcGenericTimeoutValue))
  
  //
  // SD/MMC async transfer timer interval, set by experience.
  // The unit is 100us, takes 1ms as interval.
  //
  #define SD_MMC_HC_ASYNC_TIMER  EFI_TIMER_PERIOD_MILLISECONDS(1)
  //
  // SD/MMC removable device enumeration timer interval, set by experience.
  // The unit is 100us, takes 100ms as interval.
  //
  #define SD_MMC_HC_ENUM_TIMER  EFI_TIMER_PERIOD_MILLISECONDS(100)
  
  typedef enum {
    UnknownCardType,
    SdCardType,
    SdioCardType,
    MmcCardType,
    EmmcCardType
  } SD_MMC_CARD_TYPE;
  
  typedef enum {
    RemovableSlot,
    EmbeddedSlot,
    SharedBusSlot,
    UnknownSlot
  } EFI_SD_MMC_SLOT_TYPE;
  
  typedef struct {
    BOOLEAN                              Enable;
    EFI_SD_MMC_SLOT_TYPE                 SlotType;
    BOOLEAN                              MediaPresent;
    BOOLEAN                              Initialized;
    SD_MMC_CARD_TYPE                     CardType;
    UINT64                               CurrentFreq;
    EDKII_SD_MMC_OPERATING_PARAMETERS    OperatingParameters;
  } SD_MMC_HC_SLOT;
  
  typedef struct {
    UINTN                            Signature;
  
    EFI_HANDLE                       ControllerHandle;
    EFI_PCI_IO_PROTOCOL              *PciIo;
  
    EFI_SD_MMC_PASS_THRU_PROTOCOL    PassThru;
  
    UINT64                           PciAttributes;
    //
    // The field is used to record the previous slot in GetNextSlot().
    //
    UINT8                            PreviousSlot;
    //
    // For Non-blocking operation.
    //
    EFI_EVENT                        TimerEvent;
    //
    // For Sd removable device enumeration.
    //
    EFI_EVENT                        ConnectEvent;
    LIST_ENTRY                       Queue;
  
    SD_MMC_HC_SLOT                   Slot[SD_MMC_HC_MAX_SLOT];
    SD_MMC_HC_SLOT_CAP               Capability[SD_MMC_HC_MAX_SLOT];
    UINT64                           MaxCurrent[SD_MMC_HC_MAX_SLOT];
    UINT16                           ControllerVersion[SD_MMC_HC_MAX_SLOT];
  
    //
    // Some controllers may require to override base clock frequency
    // value stored in Capabilities Register 1.
    //
    UINT32                           BaseClkFreq[SD_MMC_HC_MAX_SLOT];
  } SD_MMC_HC_PRIVATE_DATA;
  
  typedef struct {
    SD_MMC_BUS_MODE                 BusTiming;
    UINT8                           BusWidth;
    UINT32                          ClockFreq;
    EDKII_SD_MMC_DRIVER_STRENGTH    DriverStrength;
  } SD_MMC_BUS_SETTINGS;
  
  #define SD_MMC_HC_TRB_SIG  SIGNATURE_32 ('T', 'R', 'B', 'T')
  
  #define SD_MMC_TRB_RETRIES  5
  
  //
  // TRB (Transfer Request Block) contains information for the cmd request.
  //
  typedef struct {
    UINT32                                 Signature;
    LIST_ENTRY                             TrbList;
  
    UINT8                                  Slot;
    UINT16                                 BlockSize;
  
    EFI_SD_MMC_PASS_THRU_COMMAND_PACKET    *Packet;
    VOID                                   *Data;
    UINT32                                 DataLen;
    BOOLEAN                                Read;
    EFI_PHYSICAL_ADDRESS                   DataPhy;
    VOID                                   *DataMap;
    SD_MMC_HC_TRANSFER_MODE                Mode;
    SD_MMC_HC_ADMA_LENGTH_MODE             AdmaLengthMode;
  
    EFI_EVENT                              Event;
    BOOLEAN                                Started;
    BOOLEAN                                CommandComplete;
    UINT64                                 Timeout;
    UINT32                                 Retries;
  
    BOOLEAN                                PioModeTransferCompleted;
    UINT32                                 PioBlockIndex;
  
    SD_MMC_HC_ADMA_32_DESC_LINE            *Adma32Desc;
    SD_MMC_HC_ADMA_64_V3_DESC_LINE         *Adma64V3Desc;
    SD_MMC_HC_ADMA_64_V4_DESC_LINE         *Adma64V4Desc;
    EFI_PHYSICAL_ADDRESS                   AdmaDescPhy;
    VOID                                   *AdmaMap;
    UINT32                                 AdmaPages;
  
    SD_MMC_HC_PRIVATE_DATA                 *Private;
  } SD_MMC_HC_TRB;
  
  #define SD_MMC_HC_TRB_FROM_THIS(a) \
      CR(a, SD_MMC_HC_TRB, TrbList, SD_MMC_HC_TRB_SIG)
  
  //
  // Task for Non-blocking mode.
  //
  typedef struct {
    UINT32                                 Signature;
    LIST_ENTRY                             Link;
  
    UINT8                                  Slot;
    EFI_SD_MMC_PASS_THRU_COMMAND_PACKET    *Packet;
    BOOLEAN                                IsStart;
    EFI_EVENT                              Event;
    UINT64                                 RetryTimes;
    BOOLEAN                                InfiniteWait;
    VOID                                   *Map;
    VOID                                   *MapAddress;
  } SD_MMC_HC_QUEUE;
  
  //
  // Prototypes
  //
  
  /**
    Execute card identification procedure.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
  
    @retval EFI_SUCCESS       The card is identified correctly.
    @retval Others            The card can't be identified.
  
  **/
  typedef
  EFI_STATUS
  (*CARD_TYPE_DETECT_ROUTINE) (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot
    );
  
  /**
    Sends SD command to an SD card that is attached to the SD controller.
  
    The PassThru() function sends the SD command specified by Packet to the SD card
    specified by Slot.
  
    If Packet is successfully sent to the SD card, then EFI_SUCCESS is returned.
  
    If a device error occurs while sending the Packet, then EFI_DEVICE_ERROR is returned.
  
    If Slot is not in a valid range for the SD controller, then EFI_INVALID_PARAMETER
    is returned.
  
    If Packet defines a data command but both InDataBuffer and OutDataBuffer are NULL,
    EFI_INVALID_PARAMETER is returned.
  
    @param[in]     This           A pointer to the EFI_SD_MMC_PASS_THRU_PROTOCOL instance.
    @param[in]     Slot           The slot number of the SD card to send the command to.
    @param[in,out] Packet         A pointer to the SD command data structure.
    @param[in]     Event          If Event is NULL, blocking I/O is performed. If Event is
                                  not NULL, then nonblocking I/O is performed, and Event
                                  will be signaled when the Packet completes.
  
    @retval EFI_SUCCESS           The SD Command Packet was sent by the host.
    @retval EFI_DEVICE_ERROR      A device error occurred while attempting to send the SD
                                  command Packet.
    @retval EFI_INVALID_PARAMETER Packet, Slot, or the contents of the Packet is invalid.
    @retval EFI_INVALID_PARAMETER Packet defines a data command but both InDataBuffer and
                                  OutDataBuffer are NULL.
    @retval EFI_NO_MEDIA          SD Device not present in the Slot.
    @retval EFI_UNSUPPORTED       The command described by the SD Command Packet is not
                                  supported by the host controller.
    @retval EFI_BAD_BUFFER_SIZE   The InTransferLength or OutTransferLength exceeds the
                                  limit supported by SD card ( i.e. if the number of bytes
                                  exceed the Last LBA).
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPassThruPassThru (
    IN     EFI_SD_MMC_PASS_THRU_PROTOCOL        *This,
    IN     UINT8                                Slot,
    IN OUT EFI_SD_MMC_PASS_THRU_COMMAND_PACKET  *Packet,
    IN     EFI_EVENT                            Event    OPTIONAL
    );
  
  /**
    Used to retrieve next slot numbers supported by the SD controller. The function
    returns information about all available slots (populated or not-populated).
  
    The GetNextSlot() function retrieves the next slot number on an SD controller.
    If on input Slot is 0xFF, then the slot number of the first slot on the SD controller
    is returned.
  
    If Slot is a slot number that was returned on a previous call to GetNextSlot(), then
    the slot number of the next slot on the SD controller is returned.
  
    If Slot is not 0xFF and Slot was not returned on a previous call to GetNextSlot(),
    EFI_INVALID_PARAMETER is returned.
  
    If Slot is the slot number of the last slot on the SD controller, then EFI_NOT_FOUND
    is returned.
  
    @param[in]     This           A pointer to the EFI_SD_MMMC_PASS_THRU_PROTOCOL instance.
    @param[in,out] Slot           On input, a pointer to a slot number on the SD controller.
                                  On output, a pointer to the next slot number on the SD controller.
                                  An input value of 0xFF retrieves the first slot number on the SD
                                  controller.
  
    @retval EFI_SUCCESS           The next slot number on the SD controller was returned in Slot.
    @retval EFI_NOT_FOUND         There are no more slots on this SD controller.
    @retval EFI_INVALID_PARAMETER Slot is not 0xFF and Slot was not returned on a previous call
                                  to GetNextSlot().
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPassThruGetNextSlot (
    IN     EFI_SD_MMC_PASS_THRU_PROTOCOL  *This,
    IN OUT UINT8                          *Slot
    );
  
  /**
    Used to allocate and build a device path node for an SD card on the SD controller.
  
    The BuildDevicePath() function allocates and builds a single device node for the SD
    card specified by Slot.
  
    If the SD card specified by Slot is not present on the SD controller, then EFI_NOT_FOUND
    is returned.
  
    If DevicePath is NULL, then EFI_INVALID_PARAMETER is returned.
  
    If there are not enough resources to allocate the device path node, then EFI_OUT_OF_RESOURCES
    is returned.
  
    Otherwise, DevicePath is allocated with the boot service AllocatePool(), the contents of
    DevicePath are initialized to describe the SD card specified by Slot, and EFI_SUCCESS is
    returned.
  
    @param[in]     This           A pointer to the EFI_SD_MMMC_PASS_THRU_PROTOCOL instance.
    @param[in]     Slot           Specifies the slot number of the SD card for which a device
                                  path node is to be allocated and built.
    @param[in,out] DevicePath     A pointer to a single device path node that describes the SD
                                  card specified by Slot. This function is responsible for
                                  allocating the buffer DevicePath with the boot service
                                  AllocatePool(). It is the caller's responsibility to free
                                  DevicePath when the caller is finished with DevicePath.
  
    @retval EFI_SUCCESS           The device path node that describes the SD card specified by
                                  Slot was allocated and returned in DevicePath.
    @retval EFI_NOT_FOUND         The SD card specified by Slot does not exist on the SD controller.
    @retval EFI_INVALID_PARAMETER DevicePath is NULL.
    @retval EFI_OUT_OF_RESOURCES  There are not enough resources to allocate DevicePath.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPassThruBuildDevicePath (
    IN     EFI_SD_MMC_PASS_THRU_PROTOCOL  *This,
    IN     UINT8                          Slot,
    IN OUT EFI_DEVICE_PATH_PROTOCOL       **DevicePath
    );
  
  /**
    This function retrieves an SD card slot number based on the input device path.
  
    The GetSlotNumber() function retrieves slot number for the SD card specified by
    the DevicePath node. If DevicePath is NULL, EFI_INVALID_PARAMETER is returned.
  
    If DevicePath is not a device path node type that the SD Pass Thru driver supports,
    EFI_UNSUPPORTED is returned.
  
    @param[in]  This              A pointer to the EFI_SD_MMC_PASS_THRU_PROTOCOL instance.
    @param[in]  DevicePath        A pointer to the device path node that describes a SD
                                  card on the SD controller.
    @param[out] Slot              On return, points to the slot number of an SD card on
                                  the SD controller.
  
    @retval EFI_SUCCESS           SD card slot number is returned in Slot.
    @retval EFI_INVALID_PARAMETER Slot or DevicePath is NULL.
    @retval EFI_UNSUPPORTED       DevicePath is not a device path node type that the SD
                                  Pass Thru driver supports.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPassThruGetSlotNumber (
    IN  EFI_SD_MMC_PASS_THRU_PROTOCOL  *This,
    IN  EFI_DEVICE_PATH_PROTOCOL       *DevicePath,
    OUT UINT8                          *Slot
    );
  
  /**
    Resets an SD card that is connected to the SD controller.
  
    The ResetDevice() function resets the SD card specified by Slot.
  
    If this SD controller does not support a device reset operation, EFI_UNSUPPORTED is
    returned.
  
    If Slot is not in a valid slot number for this SD controller, EFI_INVALID_PARAMETER
    is returned.
  
    If the device reset operation is completed, EFI_SUCCESS is returned.
  
    @param[in]  This              A pointer to the EFI_SD_MMC_PASS_THRU_PROTOCOL instance.
    @param[in]  Slot              Specifies the slot number of the SD card to be reset.
  
    @retval EFI_SUCCESS           The SD card specified by Slot was reset.
    @retval EFI_UNSUPPORTED       The SD controller does not support a device reset operation.
    @retval EFI_INVALID_PARAMETER Slot number is invalid.
    @retval EFI_NO_MEDIA          SD Device not present in the Slot.
    @retval EFI_DEVICE_ERROR      The reset command failed due to a device error
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPassThruResetDevice (
    IN EFI_SD_MMC_PASS_THRU_PROTOCOL  *This,
    IN UINT8                          Slot
    );
  
  //
  // Driver model protocol interfaces
  //
  
  /**
    Tests to see if this driver supports a given controller. If a child device is provided,
    it further tests to see if this driver supports creating a handle for the specified child device.
  
    This function checks to see if the driver specified by This supports the device specified by
    ControllerHandle. Drivers will typically use the device path attached to
    ControllerHandle and/or the services from the bus I/O abstraction attached to
    ControllerHandle to determine if the driver supports ControllerHandle. This function
    may be called many times during platform initialization. In order to reduce boot times, the tests
    performed by this function must be very small, and take as little time as possible to execute. This
    function must not change the state of any hardware devices, and this function must be aware that the
    device specified by ControllerHandle may already be managed by the same driver or a
    different driver. This function must match its calls to AllocatePages() with FreePages(),
    AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
    Since ControllerHandle may have been previously started by the same driver, if a protocol is
    already in the opened state, then it must not be closed with CloseProtocol(). This is required
    to guarantee the state of ControllerHandle is not modified by this function.
  
    @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
    @param[in]  ControllerHandle     The handle of the controller to test. This handle
                                     must support a protocol interface that supplies
                                     an I/O abstraction to the driver.
    @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This
                                     parameter is ignored by device drivers, and is optional for bus
                                     drivers. For bus drivers, if this parameter is not NULL, then
                                     the bus driver must determine if the bus controller specified
                                     by ControllerHandle and the child controller specified
                                     by RemainingDevicePath are both supported by this
                                     bus driver.
  
    @retval EFI_SUCCESS              The device specified by ControllerHandle and
                                     RemainingDevicePath is supported by the driver specified by This.
    @retval EFI_ALREADY_STARTED      The device specified by ControllerHandle and
                                     RemainingDevicePath is already being managed by the driver
                                     specified by This.
    @retval EFI_ACCESS_DENIED        The device specified by ControllerHandle and
                                     RemainingDevicePath is already being managed by a different
                                     driver or an application that requires exclusive access.
                                     Currently not implemented.
    @retval EFI_UNSUPPORTED          The device specified by ControllerHandle and
                                     RemainingDevicePath is not supported by the driver specified by This.
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPciHcDriverBindingSupported (
    IN EFI_DRIVER_BINDING_PROTOCOL  *This,
    IN EFI_HANDLE                   Controller,
    IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
    );
  
  /**
    Starts a device controller or a bus controller.
  
    The Start() function is designed to be invoked from the EFI boot service ConnectController().
    As a result, much of the error checking on the parameters to Start() has been moved into this
    common boot service. It is legal to call Start() from other locations,
    but the following calling restrictions must be followed or the system behavior will not be deterministic.
    1. ControllerHandle must be a valid EFI_HANDLE.
    2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
       EFI_DEVICE_PATH_PROTOCOL.
    3. Prior to calling Start(), the Supported() function for the driver specified by This must
       have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
  
    @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
    @param[in]  ControllerHandle     The handle of the controller to start. This handle
                                     must support a protocol interface that supplies
                                     an I/O abstraction to the driver.
    @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This
                                     parameter is ignored by device drivers, and is optional for bus
                                     drivers. For a bus driver, if this parameter is NULL, then handles
                                     for all the children of Controller are created by this driver.
                                     If this parameter is not NULL and the first Device Path Node is
                                     not the End of Device Path Node, then only the handle for the
                                     child device specified by the first Device Path Node of
                                     RemainingDevicePath is created by this driver.
                                     If the first Device Path Node of RemainingDevicePath is
                                     the End of Device Path Node, no child handle is created by this
                                     driver.
  
    @retval EFI_SUCCESS              The device was started.
    @retval EFI_DEVICE_ERROR         The device could not be started due to a device error.Currently not implemented.
    @retval EFI_OUT_OF_RESOURCES     The request could not be completed due to a lack of resources.
    @retval Others                   The driver failded to start the device.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPciHcDriverBindingStart (
    IN EFI_DRIVER_BINDING_PROTOCOL  *This,
    IN EFI_HANDLE                   Controller,
    IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
    );
  
  /**
    Stops a device controller or a bus controller.
  
    The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
    As a result, much of the error checking on the parameters to Stop() has been moved
    into this common boot service. It is legal to call Stop() from other locations,
    but the following calling restrictions must be followed or the system behavior will not be deterministic.
    1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
       same driver's Start() function.
    2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
       EFI_HANDLE. In addition, all of these handles must have been created in this driver's
       Start() function, and the Start() function must have called OpenProtocol() on
       ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
  
    @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
    @param[in]  ControllerHandle  A handle to the device being stopped. The handle must
                                  support a bus specific I/O protocol for the driver
                                  to use to stop the device.
    @param[in]  NumberOfChildren  The number of child device handles in ChildHandleBuffer.
    @param[in]  ChildHandleBuffer An array of child handles to be freed. May be NULL
                                  if NumberOfChildren is 0.
  
    @retval EFI_SUCCESS           The device was stopped.
    @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device error.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPciHcDriverBindingStop (
    IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
    IN  EFI_HANDLE                   Controller,
    IN  UINTN                        NumberOfChildren,
    IN  EFI_HANDLE                   *ChildHandleBuffer
    );
  
  //
  // EFI Component Name Functions
  //
  
  /**
    Retrieves a Unicode string that is the user readable name of the driver.
  
    This function retrieves the user readable name of a driver in the form of a
    Unicode string. If the driver specified by This has a user readable name in
    the language specified by Language, then a pointer to the driver name is
    returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
    by This does not support the language specified by Language,
    then EFI_UNSUPPORTED is returned.
  
    @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
                                  EFI_COMPONENT_NAME_PROTOCOL instance.
  
    @param  Language[in]          A pointer to a Null-terminated ASCII string
                                  array indicating the language. This is the
                                  language of the driver name that the caller is
                                  requesting, and it must match one of the
                                  languages specified in SupportedLanguages. The
                                  number of languages supported by a driver is up
                                  to the driver writer. Language is specified
                                  in RFC 4646 or ISO 639-2 language code format.
  
    @param  DriverName[out]       A pointer to the Unicode string to return.
                                  This Unicode string is the name of the
                                  driver specified by This in the language
                                  specified by Language.
  
    @retval EFI_SUCCESS           The Unicode string for the Driver specified by
                                  This and the language specified by Language was
                                  returned in DriverName.
  
    @retval EFI_INVALID_PARAMETER Language is NULL.
  
    @retval EFI_INVALID_PARAMETER DriverName is NULL.
  
    @retval EFI_UNSUPPORTED       The driver specified by This does not support
                                  the language specified by Language.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPciHcComponentNameGetDriverName (
    IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
    IN  CHAR8                        *Language,
    OUT CHAR16                       **DriverName
    );
  
  /**
    Retrieves a Unicode string that is the user readable name of the controller
    that is being managed by a driver.
  
    This function retrieves the user readable name of the controller specified by
    ControllerHandle and ChildHandle in the form of a Unicode string. If the
    driver specified by This has a user readable name in the language specified by
    Language, then a pointer to the controller name is returned in ControllerName,
    and EFI_SUCCESS is returned.  If the driver specified by This is not currently
    managing the controller specified by ControllerHandle and ChildHandle,
    then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
    support the language specified by Language, then EFI_UNSUPPORTED is returned.
  
    @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
                                  EFI_COMPONENT_NAME_PROTOCOL instance.
  
    @param  ControllerHandle[in]  The handle of a controller that the driver
                                  specified by This is managing.  This handle
                                  specifies the controller whose name is to be
                                  returned.
  
    @param  ChildHandle[in]       The handle of the child controller to retrieve
                                  the name of.  This is an optional parameter that
                                  may be NULL.  It will be NULL for device
                                  drivers.  It will also be NULL for a bus drivers
                                  that wish to retrieve the name of the bus
                                  controller.  It will not be NULL for a bus
                                  driver that wishes to retrieve the name of a
                                  child controller.
  
    @param  Language[in]          A pointer to a Null-terminated ASCII string
                                  array indicating the language.  This is the
                                  language of the driver name that the caller is
                                  requesting, and it must match one of the
                                  languages specified in SupportedLanguages. The
                                  number of languages supported by a driver is up
                                  to the driver writer. Language is specified in
                                  RFC 4646 or ISO 639-2 language code format.
  
    @param  ControllerName[out]   A pointer to the Unicode string to return.
                                  This Unicode string is the name of the
                                  controller specified by ControllerHandle and
                                  ChildHandle in the language specified by
                                  Language from the point of view of the driver
                                  specified by This.
  
    @retval EFI_SUCCESS           The Unicode string for the user readable name in
                                  the language specified by Language for the
                                  driver specified by This was returned in
                                  DriverName.
  
    @retval EFI_INVALID_PARAMETER ControllerHandle is not a valid EFI_HANDLE.
  
    @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
                                  EFI_HANDLE.
  
    @retval EFI_INVALID_PARAMETER Language is NULL.
  
    @retval EFI_INVALID_PARAMETER ControllerName is NULL.
  
    @retval EFI_UNSUPPORTED       The driver specified by This is not currently
                                  managing the controller specified by
                                  ControllerHandle and ChildHandle.
  
    @retval EFI_UNSUPPORTED       The driver specified by This does not support
                                  the language specified by Language.
  
  **/
  EFI_STATUS
  EFIAPI
  SdMmcPciHcComponentNameGetControllerName (
    IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
    IN  EFI_HANDLE                   ControllerHandle,
    IN  EFI_HANDLE                   ChildHandle  OPTIONAL,
    IN  CHAR8                        *Language,
    OUT CHAR16                       **ControllerName
    );
  
  /**
    Create a new TRB for the SD/MMC cmd request.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
    @param[in] Packet         A pointer to the SD command data structure.
    @param[in] Event          If Event is NULL, blocking I/O is performed. If Event is
                              not NULL, then nonblocking I/O is performed, and Event
                              will be signaled when the Packet completes.
  
    @return Created Trb or NULL.
  
  **/
  SD_MMC_HC_TRB *
  SdMmcCreateTrb (
    IN SD_MMC_HC_PRIVATE_DATA               *Private,
    IN UINT8                                Slot,
    IN EFI_SD_MMC_PASS_THRU_COMMAND_PACKET  *Packet,
    IN EFI_EVENT                            Event
    );
  
  /**
    Free the resource used by the TRB.
  
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
  **/
  VOID
  SdMmcFreeTrb (
    IN SD_MMC_HC_TRB  *Trb
    );
  
  /**
    Check if the env is ready for execute specified TRB.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
    @retval EFI_SUCCESS       The env is ready for TRB execution.
    @retval EFI_NOT_READY     The env is not ready for TRB execution.
    @retval Others            Some erros happen.
  
  **/
  EFI_STATUS
  SdMmcCheckTrbEnv (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN SD_MMC_HC_TRB           *Trb
    );
  
  /**
    Wait for the env to be ready for execute specified TRB.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
    @retval EFI_SUCCESS       The env is ready for TRB execution.
    @retval EFI_TIMEOUT       The env is not ready for TRB execution in time.
    @retval Others            Some erros happen.
  
  **/
  EFI_STATUS
  SdMmcWaitTrbEnv (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN SD_MMC_HC_TRB           *Trb
    );
  
  /**
    Execute the specified TRB.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
    @retval EFI_SUCCESS       The TRB is sent to host controller successfully.
    @retval Others            Some erros happen when sending this request to the host controller.
  
  **/
  EFI_STATUS
  SdMmcExecTrb (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN SD_MMC_HC_TRB           *Trb
    );
  
  /**
    Check the TRB execution result.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
    @retval EFI_SUCCESS       The TRB is executed successfully.
    @retval EFI_NOT_READY     The TRB is not completed for execution.
    @retval Others            Some erros happen when executing this request.
  
  **/
  EFI_STATUS
  SdMmcCheckTrbResult (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN SD_MMC_HC_TRB           *Trb
    );
  
  /**
    Wait for the TRB execution result.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Trb            The pointer to the SD_MMC_HC_TRB instance.
  
    @retval EFI_SUCCESS       The TRB is executed successfully.
    @retval Others            Some erros happen when executing this request.
  
  **/
  EFI_STATUS
  SdMmcWaitTrbResult (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN SD_MMC_HC_TRB           *Trb
    );
  
  /**
    Execute EMMC device identification procedure.
  
    Refer to EMMC Electrical Standard Spec 5.1 Section 6.4 for details.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
  
    @retval EFI_SUCCESS       There is a EMMC card.
    @retval Others            There is not a EMMC card.
  
  **/
  EFI_STATUS
  EmmcIdentification (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot
    );
  
  /**
    Execute EMMC device identification procedure.
  
    Refer to EMMC Electrical Standard Spec 5.1 Section 6.4 for details.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
  
    @retval EFI_SUCCESS       There is a EMMC card.
    @retval Others            There is not a EMMC card.
  
  **/
  EFI_STATUS
  SdCardIdentification (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot
    );
  
  /**
    SD/MMC card clock supply.
  
    Refer to SD Host Controller Simplified spec 3.0 Section 3.2.1 for details.
  
    @param[in] Private         A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot            The slot number of the SD card to send the command to.
    @param[in] BusTiming       BusTiming at which the frequency change is done.
    @param[in] FirstTimeSetup  Flag to indicate whether the clock is being setup for the first time.
    @param[in] ClockFreq       The max clock frequency to be set. The unit is KHz.
  
    @retval EFI_SUCCESS       The clock is supplied successfully.
    @retval Others            The clock isn't supplied successfully.
  
  **/
  EFI_STATUS
  SdMmcHcClockSupply (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot,
    IN SD_MMC_BUS_MODE         BusTiming,
    IN BOOLEAN                 FirstTimeSetup,
    IN UINT64                  ClockFreq
    );
  
  /**
    Software reset the specified SD/MMC host controller.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
  
    @retval EFI_SUCCESS       The software reset executes successfully.
    @retval Others            The software reset fails.
  
  **/
  EFI_STATUS
  SdMmcHcReset (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot
    );
  
  /**
    Initial SD/MMC host controller with lowest clock frequency, max power and max timeout value
    at initialization.
  
    @param[in] Private        A pointer to the SD_MMC_HC_PRIVATE_DATA instance.
    @param[in] Slot           The slot number of the SD card to send the command to.
  
    @retval EFI_SUCCESS       The host controller is initialized successfully.
    @retval Others            The host controller isn't initialized successfully.
  
  **/
  EFI_STATUS
  SdMmcHcInitHost (
    IN SD_MMC_HC_PRIVATE_DATA  *Private,
    IN UINT8                   Slot
    );
  
  #endif
  