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/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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/OmapLib.h>
#include <Omap3530/Omap3530.h>
RETURN_STATUS
EFIAPI
TimerConstructor (
VOID
)
{
UINTN Timer = PcdGet32(PcdOmap35xxFreeTimer);
UINT32 TimerBaseAddress = TimerBase(Timer);
if ((MmioRead32 (TimerBaseAddress + GPTIMER_TCLR) & TCLR_ST_ON) == 0) {
// Set source clock for GPT3 & GPT4 to SYS_CLK
MmioOr32 (CM_CLKSEL_PER, CM_CLKSEL_PER_CLKSEL_GPT3_SYS | CM_CLKSEL_PER_CLKSEL_GPT4_SYS);
// Set count & reload registers
MmioWrite32 (TimerBaseAddress + GPTIMER_TCRR, 0x00000000);
MmioWrite32 (TimerBaseAddress + GPTIMER_TLDR, 0x00000000);
// Disable interrupts
MmioWrite32 (TimerBaseAddress + GPTIMER_TIER, TIER_TCAR_IT_DISABLE | TIER_OVF_IT_DISABLE | TIER_MAT_IT_DISABLE);
// Start Timer
MmioWrite32 (TimerBaseAddress + GPTIMER_TCLR, TCLR_AR_AUTORELOAD | TCLR_ST_ON);
// Disable OMAP Watchdog timer (WDT2)
MmioWrite32 (WDTIMER2_BASE + WSPR, 0xAAAA);
DEBUG ((EFI_D_ERROR, "Magic delay to disable watchdog timers properly.\n"));
MmioWrite32 (WDTIMER2_BASE + WSPR, 0x5555);
}
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 = TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_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 (TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_TCRR);
}
UINT64
EFIAPI
GetPerformanceCounterProperties (
OUT UINT64 *StartValue, OPTIONAL
OUT UINT64 *EndValue OPTIONAL
)
{
if (StartValue != NULL) {
// Timer starts with the reload value
*StartValue = (UINT64)MmioRead32 (TimerBase(PcdGet32(PcdOmap35xxFreeTimer)) + GPTIMER_TLDR);
}
if (EndValue != NULL) {
// Timer counts up to 0xFFFFFFFF
*EndValue = 0xFFFFFFFF;
}
return PcdGet64(PcdEmbeddedPerformanceCounterFrequencyInHz);
}
/**
Converts elapsed ticks of performance counter to time in nanoseconds.
This function converts the elapsed ticks of running performance counter to
time value in unit of nanoseconds.
@param Ticks The number of elapsed ticks of running performance counter.
@return The elapsed time in nanoseconds.
**/
UINT64
EFIAPI
GetTimeInNanoSecond (
IN UINT64 Ticks
)
{
UINT32 Period;
Period = PcdGet32 (PcdEmbeddedPerformanceCounterPeriodInNanoseconds);
return (Ticks * Period);
}
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