audk/BeagleBoardPkg/Library/BeagleBoardLib/BeagleBoard.c

/** @file
*
*  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
*  
*  This program and the accompanying materials                          
*  are licensed and made available under the terms and conditions of the BSD License         
*  which accompanies this distribution.  The full text of the license may be found at        
*  http://opensource.org/licenses/bsd-license.php                                            
*
*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
*
**/

#include <Library/IoLib.h>
#include <Library/ArmPlatformLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>

#include <Omap3530/Omap3530.h>
#include <BeagleBoard.h>

VOID
PadConfiguration (
  BEAGLEBOARD_REVISION Revision
  );

VOID
ClockInit (
  VOID
  );

/**
  Detect board revision

  @return Board revision
**/
BEAGLEBOARD_REVISION
BeagleBoardGetRevision (
  VOID
  )
{
  UINT32 OldPinDir;
  UINT32 Revision;

  // Read GPIO 171, 172, 173
  OldPinDir = MmioRead32 (GPIO6_BASE + GPIO_OE);
  MmioWrite32(GPIO6_BASE + GPIO_OE, (OldPinDir | BIT11 | BIT12 | BIT13));
  Revision = MmioRead32 (GPIO6_BASE + GPIO_DATAIN);
  
  // Restore I/O settings
  MmioWrite32 (GPIO6_BASE + GPIO_OE, OldPinDir);
  
  return (BEAGLEBOARD_REVISION)((Revision >> 11) & 0x7);
}

/**
  Return the current Boot Mode

  This function returns the boot reason on the platform

**/
EFI_BOOT_MODE
ArmPlatformGetBootMode (
  VOID
  )
{
  return BOOT_WITH_FULL_CONFIGURATION;
}

/**
  Initialize controllers that must setup at the early stage

  Some peripherals must be initialized in Secure World.
  For example, some L2x0 requires to be initialized in Secure World

**/
RETURN_STATUS
ArmPlatformInitialize (
  IN  UINTN                     MpId
  )
{
  BEAGLEBOARD_REVISION Revision;

  Revision = BeagleBoardGetRevision();

  // Set up Pin muxing.
  PadConfiguration (Revision);

  // Set up system clocking
  ClockInit ();

  // Turn off the functional clock for Timer 3
  MmioAnd32 (CM_FCLKEN_PER, 0xFFFFFFFF ^ CM_ICLKEN_PER_EN_GPT3_ENABLE );
  ArmDataSyncronizationBarrier ();

  // Clear IRQs
  MmioWrite32 (INTCPS_CONTROL, INTCPS_CONTROL_NEWIRQAGR);
  ArmDataSyncronizationBarrier ();

  return RETURN_SUCCESS;
}

/**
  Initialize the system (or sometimes called permanent) memory

  This memory is generally represented by the DRAM.

**/
VOID
ArmPlatformInitializeSystemMemory (
  VOID
  )
{
  // We do not need to initialize the System Memory on RTSM
}