C++ (Cpp) EFI_SD_MMC_PASS_THRU_PROTOCOL::PassThru示例

示例#1

文件： SdBlockIo.c 项目： MattDevo/edk2

/**
  Send command SET_RELATIVE_ADDRESS to the device to set the device address.

  @param[in]  Device            A pointer to the SD_DEVICE instance.
  @param[out] Rca               The relative device address to assign.

  @retval EFI_SUCCESS           The request is executed successfully.
  @retval EFI_OUT_OF_RESOURCES  The request could not be executed due to a lack of resources.
  @retval Others                The request could not be executed successfully.

**/
EFI_STATUS
SdSetRca (
  IN     SD_DEVICE              *Device,
     OUT UINT16                 *Rca
  )
{
  EFI_STATUS                           Status;
  EFI_SD_MMC_PASS_THRU_PROTOCOL        *PassThru;
  EFI_SD_MMC_COMMAND_BLOCK             SdMmcCmdBlk;
  EFI_SD_MMC_STATUS_BLOCK              SdMmcStatusBlk;
  EFI_SD_MMC_PASS_THRU_COMMAND_PACKET  Packet;

  PassThru = Device->Private->PassThru;

  ZeroMem (&SdMmcCmdBlk, sizeof (SdMmcCmdBlk));
  ZeroMem (&SdMmcStatusBlk, sizeof (SdMmcStatusBlk));
  ZeroMem (&Packet, sizeof (Packet));
  Packet.SdMmcCmdBlk    = &SdMmcCmdBlk;
  Packet.SdMmcStatusBlk = &SdMmcStatusBlk;
  Packet.Timeout        = SD_GENERIC_TIMEOUT;

  SdMmcCmdBlk.CommandIndex = SD_SET_RELATIVE_ADDR;
  SdMmcCmdBlk.CommandType  = SdMmcCommandTypeBcr;
  SdMmcCmdBlk.ResponseType = SdMmcResponseTypeR6;

  Status = PassThru->PassThru (PassThru, Device->Slot, &Packet, NULL);
  if (!EFI_ERROR (Status)) {
    DEBUG ((EFI_D_INFO, "Set RCA succeeds with Resp0 = 0x%x\n", SdMmcStatusBlk.Resp0));
    *Rca = (UINT16)(SdMmcStatusBlk.Resp0 >> 16);
  }