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      1 /** @file
      2 
      3   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
      4 
      5   This program and the accompanying materials
      6   are licensed and made available under the terms and conditions of the BSD License
      7   which accompanies this distribution.  The full text of the license may be found at
      8   http://opensource.org/licenses/bsd-license.php
      9 
     10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     12 
     13 **/
     14 
     15 #include <Uefi.h>
     16 
     17 #include <Library/IoLib.h>
     18 #include <Library/OmapLib.h>
     19 #include <Library/UefiBootServicesTableLib.h>
     20 
     21 #include <Protocol/EmbeddedGpio.h>
     22 
     23 #include <Omap3530/Omap3530.h>
     24 
     25 EFI_STATUS
     26 Get (
     27   IN  EMBEDDED_GPIO     *This,
     28   IN  EMBEDDED_GPIO_PIN Gpio,
     29   OUT UINTN               *Value
     30   )
     31 {
     32   UINTN  Port;
     33   UINTN  Pin;
     34   UINT32 DataInRegister;
     35 
     36   if (Value == NULL)
     37   {
     38     return EFI_UNSUPPORTED;
     39   }
     40 
     41   Port    = GPIO_PORT(Gpio);
     42   Pin     = GPIO_PIN(Gpio);
     43 
     44   DataInRegister = GpioBase(Port) + GPIO_DATAIN;
     45 
     46   if (MmioRead32 (DataInRegister) & GPIO_DATAIN_MASK(Pin)) {
     47     *Value = 1;
     48   } else {
     49     *Value = 0;
     50   }
     51 
     52   return EFI_SUCCESS;
     53 }
     54 
     55 EFI_STATUS
     56 Set (
     57   IN  EMBEDDED_GPIO       *This,
     58   IN  EMBEDDED_GPIO_PIN   Gpio,
     59   IN  EMBEDDED_GPIO_MODE  Mode
     60   )
     61 {
     62   UINTN  Port;
     63   UINTN  Pin;
     64   UINT32 OutputEnableRegister;
     65   UINT32 SetDataOutRegister;
     66   UINT32 ClearDataOutRegister;
     67 
     68   Port    = GPIO_PORT(Gpio);
     69   Pin     = GPIO_PIN(Gpio);
     70 
     71   OutputEnableRegister = GpioBase(Port) + GPIO_OE;
     72   SetDataOutRegister   = GpioBase(Port) + GPIO_SETDATAOUT;
     73   ClearDataOutRegister = GpioBase(Port) + GPIO_CLEARDATAOUT;
     74 
     75   switch (Mode)
     76   {
     77     case GPIO_MODE_INPUT:
     78       MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_INPUT(Pin));
     79       break;
     80 
     81     case GPIO_MODE_OUTPUT_0:
     82       MmioWrite32 (ClearDataOutRegister, GPIO_CLEARDATAOUT_BIT(Pin));
     83       MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_OUTPUT(Pin));
     84       break;
     85 
     86     case GPIO_MODE_OUTPUT_1:
     87       MmioWrite32 (SetDataOutRegister, GPIO_SETDATAOUT_BIT(Pin));
     88       MmioAndThenOr32(OutputEnableRegister, ~GPIO_OE_MASK(Pin), GPIO_OE_OUTPUT(Pin));
     89       break;
     90 
     91     default:
     92       return EFI_UNSUPPORTED;
     93   }
     94 
     95   return EFI_SUCCESS;
     96 }
     97 
     98 EFI_STATUS
     99 GetMode (
    100   IN  EMBEDDED_GPIO       *This,
    101   IN  EMBEDDED_GPIO_PIN   Gpio,
    102   OUT EMBEDDED_GPIO_MODE  *Mode
    103   )
    104 {
    105   return EFI_UNSUPPORTED;
    106 }
    107 
    108 EFI_STATUS
    109 SetPull (
    110   IN  EMBEDDED_GPIO       *This,
    111   IN  EMBEDDED_GPIO_PIN   Gpio,
    112   IN  EMBEDDED_GPIO_PULL  Direction
    113   )
    114 {
    115   return EFI_UNSUPPORTED;
    116 }
    117 
    118 EMBEDDED_GPIO Gpio = {
    119   Get,
    120   Set,
    121   GetMode,
    122   SetPull
    123 };
    124 
    125 EFI_STATUS
    126 GpioInitialize (
    127   IN EFI_HANDLE         ImageHandle,
    128   IN EFI_SYSTEM_TABLE   *SystemTable
    129   )
    130 {
    131   EFI_STATUS  Status;
    132 
    133   Status = gBS->InstallMultipleProtocolInterfaces(&ImageHandle, &gEmbeddedGpioProtocolGuid, &Gpio, NULL);
    134   return Status;
    135 }
    136