Upload BSD-licensed Vlv2TbltDevicePkg and Vlv2DeviceRefCodePkg to
https://svn.code.sf.net/p/edk2/code/trunk/edk2/, which are for MinnowBoard MAX open source project. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: David Wei <david.wei@intel.com> Reviewed-by: Mike Wu <mike.wu@intel.com> Reviewed-by: Hot Tian <hot.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16599 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
David Wei
zwei4
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/** @file
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ICH9 ACPI Timer implements one instance of Timer Library.
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Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "CommonHeader.h"
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/**
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The constructor function enables ACPI IO space.
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If ACPI I/O space not enabled, this function will enable it.
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It will always return RETURN_SUCCESS.
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@retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
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**/
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RETURN_STATUS
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EFIAPI
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IntelPchAcpiTimerLibConstructor (
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VOID
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)
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{
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if ((PchLpcPciCfg8(R_PCH_LPC_ACPI_BASE) & B_PCH_LPC_ACPI_BASE_EN) == 0) {
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//
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// If ACPI I/O space is not enabled, program ACPI I/O base address and enable it.
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//
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MmioWrite16 (
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MmPciAddress (
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0,
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DEFAULT_PCI_BUS_NUMBER_PCH,
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PCI_DEVICE_NUMBER_PCH_LPC,
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PCI_FUNCTION_NUMBER_PCH_LPC,
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R_PCH_LPC_ACPI_BASE
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),
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((PcdGet16 (PcdPchAcpiIoPortBaseAddress) & B_PCH_LPC_ACPI_BASE_BAR) | B_PCH_LPC_ACPI_BASE_EN)
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);
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}
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return RETURN_SUCCESS;
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}
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/**
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Internal function to read the current tick counter of ACPI.
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Internal function to read the current tick counter of ACPI.
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@return The tick counter read.
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**/
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STATIC
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UINT32
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InternalAcpiGetTimerTick (
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VOID
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)
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{
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return IoRead32 (PcdGet16 (PcdPchAcpiIoPortBaseAddress) + R_PCH_ACPI_PM1_TMR);
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}
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/**
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Stalls the CPU for at least the given number of ticks.
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Stalls the CPU for at least the given number of ticks. It's invoked by
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MicroSecondDelay() and NanoSecondDelay().
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@param Delay A period of time to delay in ticks.
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**/
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STATIC
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VOID
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InternalAcpiDelay (
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IN UINT32 Delay
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)
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{
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UINT32 Ticks;
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UINT32 Times;
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Times = Delay >> 22;
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Delay &= BIT22 - 1;
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do {
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//
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// The target timer count is calculated here
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//
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Ticks = InternalAcpiGetTimerTick () + Delay;
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Delay = BIT22;
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//
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// Wait until time out
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// Delay >= 2^23 could not be handled by this function
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// Timer wrap-arounds are handled correctly by this function
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//
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while (((Ticks - InternalAcpiGetTimerTick ()) & BIT23) == 0) {
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CpuPause ();
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}
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} while (Times-- > 0);
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}
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/**
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Stalls the CPU for at least the given number of microseconds.
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Stalls the CPU for the number of microseconds specified by MicroSeconds.
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@param MicroSeconds The minimum number of microseconds to delay.
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@return MicroSeconds
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**/
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UINTN
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EFIAPI
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MicroSecondDelay (
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IN UINTN MicroSeconds
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)
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{
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InternalAcpiDelay (
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(UINT32)DivU64x32 (
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MultU64x32 (
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MicroSeconds,
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V_PCH_ACPI_PM1_TMR_FREQUENCY
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),
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1000000u
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)
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);
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return MicroSeconds;
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}
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/**
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Stalls the CPU for at least the given number of nanoseconds.
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Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
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@param NanoSeconds The minimum number of nanoseconds to delay.
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@return NanoSeconds
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**/
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UINTN
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EFIAPI
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NanoSecondDelay (
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IN UINTN NanoSeconds
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)
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{
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InternalAcpiDelay (
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(UINT32)DivU64x32 (
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MultU64x32 (
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NanoSeconds,
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V_PCH_ACPI_PM1_TMR_FREQUENCY
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),
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1000000000u
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)
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);
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return NanoSeconds;
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}
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/**
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Retrieves the current value of a 64-bit free running performance counter.
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Retrieves the current value of a 64-bit free running performance counter. The
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counter can either count up by 1 or count down by 1. If the physical
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performance counter counts by a larger increment, then the counter values
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must be translated. The properties of the counter can be retrieved from
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GetPerformanceCounterProperties().
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@return The current value of the free running performance counter.
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**/
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UINT64
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EFIAPI
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GetPerformanceCounter (
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VOID
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)
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{
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return (UINT64)InternalAcpiGetTimerTick ();
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}
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/**
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Retrieves the 64-bit frequency in Hz and the range of performance counter
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values.
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If StartValue is not NULL, then the value that the performance counter starts
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with immediately after is it rolls over is returned in StartValue. If
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EndValue is not NULL, then the value that the performance counter end with
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immediately before it rolls over is returned in EndValue. The 64-bit
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frequency of the performance counter in Hz is always returned. If StartValue
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is less than EndValue, then the performance counter counts up. If StartValue
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is greater than EndValue, then the performance counter counts down. For
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example, a 64-bit free running counter that counts up would have a StartValue
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of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
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that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
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@param StartValue The value the performance counter starts with when it
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rolls over.
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@param EndValue The value that the performance counter ends with before
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it rolls over.
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@return The frequency in Hz.
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**/
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UINT64
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EFIAPI
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GetPerformanceCounterProperties (
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OUT UINT64 *StartValue, OPTIONAL
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OUT UINT64 *EndValue OPTIONAL
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)
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{
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if (StartValue != NULL) {
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*StartValue = 0;
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}
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if (EndValue != NULL) {
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*EndValue = V_PCH_ACPI_PM1_TMR_MAX_VAL - 1;
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}
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return V_PCH_ACPI_PM1_TMR_FREQUENCY;
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}
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/**
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Converts elapsed ticks of performance counter to time in nanoseconds.
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This function converts the elapsed ticks of running performance counter to
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time value in unit of nanoseconds.
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@param Ticks The number of elapsed ticks of running performance counter.
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@return The elapsed time in nanoseconds.
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**/
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UINT64
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EFIAPI
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GetTimeInNanoSecond (
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IN UINT64 Ticks
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)
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{
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UINT64 NanoSeconds;
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UINT32 Remainder;
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//
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// Ticks
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// Time = --------- x 1,000,000,000
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// Frequency
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//
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NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, V_PCH_ACPI_PM1_TMR_FREQUENCY, &Remainder), 1000000000u);
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//
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