1 files changed, 113 insertions, 0 deletions
diff --git a/TexasInstrumentsPkg/BeagleBoneBlackPkg/Library/Am335xTimerLib/TimerLib.c b/TexasInstrumentsPkg/BeagleBoneBlackPkg/Library/Am335xTimerLib/TimerLib.c
new file mode 100644
index 000000000..d90c27982
--- /dev/null
+++ b/TexasInstrumentsPkg/BeagleBoneBlackPkg/Library/Am335xTimerLib/TimerLib.c
@@ -0,0 +1,113 @@
+/** @file
+*
+*  Copyright (c) 2011-2014, 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 <Uefi.h>
+
+#include <Library/BaseLib.h>
+#include <Library/TimerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+#include <Library/IoLib.h>
+
+#include <Library/Am335x.h>
+
+RETURN_STATUS
+EFIAPI
+TimerConstructor (
+  VOID
+  )
+{
+  UINT32 TimerControlRegister = DMTIMER0_BASE + DMTIMER_TCLR;
+  MmioOr32 (TimerControlRegister, 0x01);
+
+  return EFI_SUCCESS;
+}
+
+UINTN
+EFIAPI
+MicroSecondDelay (
+  IN  UINTN MicroSeconds
+  )
+{
+  UINT64  NanoSeconds;
+  
+  NanoSeconds = MultU64x32(MicroSeconds, 1000);
+
+  while (NanoSeconds > (UINTN)-1) { 
+    NanoSecondDelay((UINTN)-1);
+    NanoSeconds -= (UINTN)-1;
+  }
+
+  NanoSecondDelay(NanoSeconds);
+
+  return MicroSeconds;
+}
+
+UINTN
+EFIAPI
+NanoSecondDelay (
+  IN  UINTN NanoSeconds
+  )
+{
+  UINT32  Delay;
+  UINT32  StartTime;
+  UINT32  CurrentTime;
+  UINT32  ElapsedTime;
+  UINT32  TimerCountRegister;
+
+  Delay = (NanoSeconds / PcdGet32(PcdEmbeddedPerformanceCounterPeriodInNanoseconds)) + 1;
+  
+  TimerCountRegister = DMTIMER0_BASE + DMTIMER_TCRR;
+
+  StartTime = MmioRead32 (TimerCountRegister);
+
+  do 
+  {
+    CurrentTime = MmioRead32 (TimerCountRegister);
+    ElapsedTime = CurrentTime - StartTime;
+  } while (ElapsedTime < Delay);
+
+  NanoSeconds = ElapsedTime * PcdGet32(PcdEmbeddedPerformanceCounterPeriodInNanoseconds);
+
+  return NanoSeconds;
+}
+
+UINT64
+EFIAPI
+GetPerformanceCounter (
+  VOID
+  )
+{ 
+  return (UINT64)MmioRead32 (DMTIMER0_BASE + DMTIMER_TCRR);
+}
+
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+  OUT UINT64  *StartValue,  OPTIONAL
+  OUT UINT64  *EndValue     OPTIONAL
+  )
+{
+  if (StartValue != NULL) {
+    // Timer starts with the reload value
+    *StartValue = (UINT64)MmioRead32 (DMTIMER0_BASE + DMTIMER_TLDR);
+  }
+  
+  if (EndValue != NULL) {
+    // Timer counts up to 0xFFFFFFFF
+    *EndValue = 0xFFFFFFFF;
+  }
+  
+  return PcdGet64(PcdEmbeddedPerformanceCounterFrequencyInHz);
+}