audk/Omap35xxPkg/Gpio/Gpio.c

/** @file

  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>

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

**/

#include <Uefi.h>

#include <Library/IoLib.h>
#include <Library/OmapLib.h>
#include <Library/UefiBootServicesTableLib.h>

#include <Protocol/EmbeddedGpio.h>

#include <Omap3530/Omap3530.h>

EFI_STATUS
Get (
  IN  EMBEDDED_GPIO     *This,
  IN  EMBEDDED_GPIO_PIN Gpio,
  OUT UINTN               *Value
  )
{
  UINTN  Port;
  UINTN  Pin;
  UINT32 DataInRegister;

  if (Value == NULL)
  {
    return EFI_UNSUPPORTED;
  }

  Port    = GPIO_PORT(Gpio);
  Pin     = GPIO_PIN(Gpio);

  DataInRegister = GpioBase(Port) + GPIO_DATAIN;

  if (MmioRead32 (DataInRegister) & GPIO_DATAIN_MASK(Pin)) {
    *Value = 1;
  } else {
    *Value = 0;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
Set (
  IN  EMBEDDED_GPIO       *This,
  IN  EMBEDDED_GPIO_PIN   Gpio,
  IN  EMBEDDED_GPIO_MODE  Mode
  )
{
  UINTN  Port;
  UINTN  Pin;
  UINT32 OutputEnableRegister;
  UINT32 SetDataOutRegister;
  UINT32 ClearDataOutRegister;

  Port    = GPIO_PORT(Gpio);
  Pin     = GPIO_PIN(Gpio);

  OutputEnableRegister = GpioBase(Port) + GPIO_OE;
  SetDataOutRegister   = GpioBase(Port) + GPIO_SETDATAOUT;
  ClearDataOutRegister = GpioBase(Port) + GPIO_CLEARDATAOUT;

  switch (Mode)
  {
    case GPIO_MODE_INPUT:
      MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_INPUT(Pin));
      break;

    case GPIO_MODE_OUTPUT_0:
      MmioWrite32 (ClearDataOutRegister, GPIO_CLEARDATAOUT_BIT(Pin));
      MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_OUTPUT(Pin));
      break;

    case GPIO_MODE_OUTPUT_1:
      MmioWrite32 (SetDataOutRegister, GPIO_SETDATAOUT_BIT(Pin));
      MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_OUTPUT(Pin));
      break;

    default:
      return EFI_UNSUPPORTED;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
GetMode (
  IN  EMBEDDED_GPIO       *This,
  IN  EMBEDDED_GPIO_PIN   Gpio,
  OUT EMBEDDED_GPIO_MODE  *Mode
  )
{
  return EFI_UNSUPPORTED;
}

EFI_STATUS
SetPull (
  IN  EMBEDDED_GPIO       *This,
  IN  EMBEDDED_GPIO_PIN   Gpio,
  IN  EMBEDDED_GPIO_PULL  Direction
  )
{
  return EFI_UNSUPPORTED;
}

EMBEDDED_GPIO Gpio = {
  Get,
  Set,
  GetMode,
  SetPull
};

EFI_STATUS
GpioInitialize (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
{
  EFI_STATUS  Status;

  Status = gBS->InstallMultipleProtocolInterfaces(&ImageHandle, &gEmbeddedGpioProtocolGuid, &Gpio, NULL);
  return Status;
}