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[mirror_edk2.git] / Omap35xxPkg / Library / Omap35xxTimerLib / TimerLib.c

/** @file\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Uefi.h>\r
\r
#include <Library/BaseLib.h>\r
#include <Library/TimerLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/OmapLib.h>\r
\r
#include <Omap3530/Omap3530.h>\r
\r
RETURN_STATUS\r
EFIAPI\r
TimerConstructor (\r
  VOID\r
  )\r
{\r
  UINTN  Timer            = PcdGet32(PcdOmap35xxFreeTimer);\r
  UINT32 TimerBaseAddress = TimerBase(Timer);\r
\r
  if ((MmioRead32 (TimerBaseAddress + GPTIMER_TCLR) & TCLR_ST_ON) == 0) {\r
    // Set source clock for GPT3 & GPT4 to SYS_CLK\r
    MmioOr32 (CM_CLKSEL_PER, CM_CLKSEL_PER_CLKSEL_GPT3_SYS | CM_CLKSEL_PER_CLKSEL_GPT4_SYS);\r
\r
    // Set count & reload registers\r
    MmioWrite32 (TimerBaseAddress + GPTIMER_TCRR, 0x00000000);\r
    MmioWrite32 (TimerBaseAddress + GPTIMER_TLDR, 0x00000000);\r
\r
    // Disable interrupts\r
    MmioWrite32 (TimerBaseAddress + GPTIMER_TIER, TIER_TCAR_IT_DISABLE | TIER_OVF_IT_DISABLE | TIER_MAT_IT_DISABLE);\r
\r
    // Start Timer\r
    MmioWrite32 (TimerBaseAddress + GPTIMER_TCLR, TCLR_AR_AUTORELOAD | TCLR_ST_ON);\r
\r
    // Disable OMAP Watchdog timer (WDT2)\r
    MmioWrite32 (WDTIMER2_BASE + WSPR, 0xAAAA);\r
    DEBUG ((EFI_D_ERROR, "Magic delay to disable watchdog timers properly.\n"));\r
    MmioWrite32 (WDTIMER2_BASE + WSPR, 0x5555);\r
  }\r
  return EFI_SUCCESS;\r
}\r
\r
UINTN\r
EFIAPI\r
MicroSecondDelay (\r
  IN  UINTN MicroSeconds\r
  )\r
{\r
  UINT64  NanoSeconds;\r
\r
  NanoSeconds = MultU64x32(MicroSeconds, 1000);\r
\r
  while (NanoSeconds > (UINTN)-1) {\r
    NanoSecondDelay((UINTN)-1);\r
    NanoSeconds -= (UINTN)-1;\r
  }\r
\r
  NanoSecondDelay(NanoSeconds);\r
\r
  return MicroSeconds;\r
}\r
\r
UINTN\r
EFIAPI\r
NanoSecondDelay (\r
  IN  UINTN NanoSeconds\r
  )\r
{\r
  UINT32  Delay;\r
  UINT32  StartTime;\r
  UINT32  CurrentTime;\r
  UINT32  ElapsedTime;\r
  UINT32  TimerCountRegister;\r
\r
  Delay = (NanoSeconds / PcdGet32(PcdEmbeddedPerformanceCounterPeriodInNanoseconds)) + 1;\r
\r
  TimerCountRegister = TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_TCRR;\r
\r
  StartTime = MmioRead32 (TimerCountRegister);\r
\r
  do\r
  {\r
    CurrentTime = MmioRead32 (TimerCountRegister);\r
    ElapsedTime = CurrentTime - StartTime;\r
  } while (ElapsedTime < Delay);\r
\r
  NanoSeconds = ElapsedTime * PcdGet32(PcdEmbeddedPerformanceCounterPeriodInNanoseconds);\r
\r
  return NanoSeconds;\r
}\r
\r
UINT64\r
EFIAPI\r
GetPerformanceCounter (\r
  VOID\r
  )\r
{\r
  return (UINT64)MmioRead32 (TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_TCRR);\r
}\r
\r
UINT64\r
EFIAPI\r
GetPerformanceCounterProperties (\r
  OUT UINT64  *StartValue,  OPTIONAL\r
  OUT UINT64  *EndValue     OPTIONAL\r
  )\r
{\r
  if (StartValue != NULL) {\r
    // Timer starts with the reload value\r
    *StartValue = (UINT64)MmioRead32 (TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_TLDR);\r
  }\r
\r
  if (EndValue != NULL) {\r
    // Timer counts up to 0xFFFFFFFF\r
    *EndValue = 0xFFFFFFFF;\r
  }\r
\r
  return PcdGet64(PcdEmbeddedPerformanceCounterFrequencyInHz);\r
}\r
\r
/**\r
  Converts elapsed ticks of performance counter to time in nanoseconds.\r
\r
  This function converts the elapsed ticks of running performance counter to\r
  time value in unit of nanoseconds.\r
\r
  @param  Ticks     The number of elapsed ticks of running performance counter.\r
\r
  @return The elapsed time in nanoseconds.\r
\r
**/\r
UINT64\r
EFIAPI\r
GetTimeInNanoSecond (\r
  IN      UINT64                     Ticks\r
  )\r
{\r
  UINT32 Period;\r
\r
  Period = PcdGet32 (PcdEmbeddedPerformanceCounterPeriodInNanoseconds);\r
\r
  return (Ticks * Period);\r
}\r