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- Fixed misspellings - Updated Copyright - Remove unused sections in INF file - Fixed incorrect commentsi - Fixed coding style - Fixed line endings (CRLR) git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13052 6f19259b-4bc3-4df7-8a09-765794883524
600 lines
18 KiB
C
600 lines
18 KiB
C
/** @file
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Implement EFI RealTimeClock runtime services via RTC Lib.
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Currently this driver does not support runtime virtual calling.
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Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. 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 <Uefi.h>
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#include <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiLib.h>
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#include <Library/IoLib.h>
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#include <Library/RealTimeClockLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/ArmPlatformSysConfigLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Protocol/RealTimeClock.h>
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#include <Guid/GlobalVariable.h>
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#include <Drivers/PL031RealTimeClock.h>
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#include <ArmPlatform.h>
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CHAR16 mTimeZoneVariableName[] = L"PL031_TimeZone";
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CHAR16 mDaylightVariableName[] = L"PL031_Daylight";
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BOOLEAN mPL031Initialized = FALSE;
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EFI_STATUS
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IdentifyPL031 (
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VOID
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)
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{
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EFI_STATUS Status;
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// Check if this is a PrimeCell Peripheral
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if ( (MmioRead8 (PL031_RTC_PCELL_ID0) != 0x0D)
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|| (MmioRead8 (PL031_RTC_PCELL_ID1) != 0xF0)
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|| (MmioRead8 (PL031_RTC_PCELL_ID2) != 0x05)
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|| (MmioRead8 (PL031_RTC_PCELL_ID3) != 0xB1)) {
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Status = EFI_NOT_FOUND;
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goto EXIT;
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}
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// Check if this PrimeCell Peripheral is the PL031 Real Time Clock
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if ( (MmioRead8 (PL031_RTC_PERIPH_ID0) != 0x31)
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|| (MmioRead8 (PL031_RTC_PERIPH_ID1) != 0x10)
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|| ((MmioRead8 (PL031_RTC_PERIPH_ID2) & 0xF) != 0x04)
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|| (MmioRead8 (PL031_RTC_PERIPH_ID3) != 0x00)) {
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Status = EFI_NOT_FOUND;
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goto EXIT;
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}
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Status = EFI_SUCCESS;
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EXIT:
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return Status;
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}
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EFI_STATUS
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InitializePL031 (
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VOID
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)
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{
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EFI_STATUS Status;
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// Prepare the hardware
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Status = IdentifyPL031();
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if (EFI_ERROR (Status)) {
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goto EXIT;
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}
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// Ensure interrupts are masked. We do not want RTC interrupts in UEFI
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if ((MmioRead32 (PL031_RTC_IMSC_IRQ_MASK_SET_CLEAR_REGISTER) & PL031_SET_IRQ_MASK) != PL031_SET_IRQ_MASK) {
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MmioOr32 (PL031_RTC_IMSC_IRQ_MASK_SET_CLEAR_REGISTER, PL031_SET_IRQ_MASK);
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}
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// Clear any existing interrupts
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if ((MmioRead32 (PL031_RTC_RIS_RAW_IRQ_STATUS_REGISTER) & PL031_IRQ_TRIGGERED) == PL031_IRQ_TRIGGERED) {
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MmioOr32 (PL031_RTC_ICR_IRQ_CLEAR_REGISTER, PL031_CLEAR_IRQ);
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}
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// Start the clock counter
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if ((MmioRead32 (PL031_RTC_CR_CONTROL_REGISTER) & PL031_RTC_ENABLED) != PL031_RTC_ENABLED) {
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MmioOr32 (PL031_RTC_CR_CONTROL_REGISTER, PL031_RTC_ENABLED);
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}
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mPL031Initialized = TRUE;
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EXIT:
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return Status;
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}
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/**
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Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME
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**/
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VOID
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EpochToEfiTime (
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IN UINTN EpochSeconds,
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OUT EFI_TIME *Time
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)
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{
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UINTN a;
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UINTN b;
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UINTN c;
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UINTN d;
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UINTN g;
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UINTN j;
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UINTN m;
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UINTN y;
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UINTN da;
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UINTN db;
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UINTN dc;
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UINTN dg;
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UINTN hh;
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UINTN mm;
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UINTN ss;
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UINTN J;
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if (Time->Daylight == TRUE) {
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}
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J = (EpochSeconds / 86400) + 2440588;
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j = J + 32044;
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g = j / 146097;
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dg = j % 146097;
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c = (((dg / 36524) + 1) * 3) / 4;
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dc = dg - (c * 36524);
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b = dc / 1461;
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db = dc % 1461;
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a = (((db / 365) + 1) * 3) / 4;
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da = db - (a * 365);
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y = (g * 400) + (c * 100) + (b * 4) + a;
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m = (((da * 5) + 308) / 153) - 2;
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d = da - (((m + 4) * 153) / 5) + 122;
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Time->Year = y - 4800 + ((m + 2) / 12);
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Time->Month = ((m + 2) % 12) + 1;
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Time->Day = d + 1;
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ss = EpochSeconds % 60;
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a = (EpochSeconds - ss) / 60;
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mm = a % 60;
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b = (a - mm) / 60;
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hh = b % 24;
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Time->Hour = hh;
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Time->Minute = mm;
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Time->Second = ss;
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Time->Nanosecond = 0;
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}
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/**
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Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)
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**/
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UINTN
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EfiTimeToEpoch (
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IN EFI_TIME *Time
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)
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{
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UINTN a;
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UINTN y;
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UINTN m;
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UINTN JulianDate; // Absolute Julian Date representation of the supplied Time
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UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY
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UINTN EpochSeconds;
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a = (14 - Time->Month) / 12 ;
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y = Time->Year + 4800 - a;
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m = Time->Month + (12*a) - 3;
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JulianDate = Time->Day + ((153*m + 2)/5) + (365*y) + (y/4) - (y/100) + (y/400) - 32045;
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ASSERT(JulianDate > EPOCH_JULIAN_DATE);
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EpochDays = JulianDate - EPOCH_JULIAN_DATE;
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EpochSeconds = (EpochDays * SEC_PER_DAY) + ((UINTN)Time->Hour * SEC_PER_HOUR) + (Time->Minute * SEC_PER_MIN) + Time->Second;
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return EpochSeconds;
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}
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BOOLEAN
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IsLeapYear (
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IN EFI_TIME *Time
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)
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{
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if (Time->Year % 4 == 0) {
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if (Time->Year % 100 == 0) {
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if (Time->Year % 400 == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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} else {
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return TRUE;
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}
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} else {
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return FALSE;
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}
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}
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BOOLEAN
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DayValid (
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IN EFI_TIME *Time
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)
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{
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INTN DayOfMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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if (Time->Day < 1 ||
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Time->Day > DayOfMonth[Time->Month - 1] ||
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(Time->Month == 2 && (!IsLeapYear (Time) && Time->Day > 28))
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) {
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return FALSE;
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}
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return TRUE;
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}
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/**
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Returns the current time and date information, and the time-keeping capabilities
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of the hardware platform.
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@param Time A pointer to storage to receive a snapshot of the current time.
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@param Capabilities An optional pointer to a buffer to receive the real time clock
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device's capabilities.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER Time is NULL.
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@retval EFI_DEVICE_ERROR The time could not be retrieved due to hardware error.
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**/
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EFI_STATUS
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EFIAPI
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LibGetTime (
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OUT EFI_TIME *Time,
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OUT EFI_TIME_CAPABILITIES *Capabilities
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)
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{
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EFI_STATUS Status = EFI_SUCCESS;
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UINTN EpochSeconds;
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INT16 *TimeZone = 0;
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UINTN *Daylight = 0;
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// Initialize the hardware if not already done
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if (!mPL031Initialized) {
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Status = InitializePL031 ();
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if (EFI_ERROR (Status)) {
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goto EXIT;
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}
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}
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// Snapshot the time as early in the function call as possible
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// On some platforms we may have access to a battery backed up hardware clock.
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// If such RTC exists try to use it first.
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Status = ArmPlatformSysConfigGet (SYS_CFG_RTC, &EpochSeconds);
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if (Status == EFI_UNSUPPORTED) {
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// Battery backed up hardware RTC does not exist, revert to PL031
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EpochSeconds = MmioRead32 (PL031_RTC_DR_DATA_REGISTER);
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Status = EFI_SUCCESS;
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} else if (EFI_ERROR (Status)) {
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// Battery backed up hardware RTC exists but could not be read due to error. Abort.
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goto EXIT;
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} else {
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// Battery backed up hardware RTC exists and we read the time correctly from it.
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// Now sync the PL031 to the new time.
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MmioWrite32 (PL031_RTC_LR_LOAD_REGISTER, EpochSeconds);
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}
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// Ensure Time is a valid pointer
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if (Time == NULL) {
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Status = EFI_INVALID_PARAMETER;
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goto EXIT;
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}
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// Get the current time zone information from non-volatile storage
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TimeZone = (INT16 *)GetVariable(mTimeZoneVariableName, &gEfiGlobalVariableGuid);
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if (TimeZone == NULL) {
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// The time zone variable does not exist in non-volatile storage, so create it.
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Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
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// Store it
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Status = gRT->SetVariable (
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mTimeZoneVariableName,
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&gEfiGlobalVariableGuid,
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EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(Time->TimeZone),
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&(Time->TimeZone)
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);
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if (EFI_ERROR (Status)) {
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DEBUG((EFI_D_ERROR,"LibGetTime: ERROR: TimeZone\n"));
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goto EXIT;
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}
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} else {
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// Got the time zone
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Time->TimeZone = *TimeZone;
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FreePool(TimeZone);
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// Check TimeZone bounds: -1440 to 1440 or 2047
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if (((Time->TimeZone < -1440) || (Time->TimeZone > 1440))
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&& (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE)) {
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Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
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}
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// Adjust for the correct time zone
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if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
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EpochSeconds += Time->TimeZone * SEC_PER_MIN;
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}
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}
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// Get the current daylight information from non-volatile storage
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Daylight = (UINTN *)GetVariable(mDaylightVariableName, &gEfiGlobalVariableGuid);
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if (Daylight == NULL) {
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// The daylight variable does not exist in non-volatile storage, so create it.
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Time->Daylight = 0;
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// Store it
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Status = gRT->SetVariable (
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mDaylightVariableName,
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&gEfiGlobalVariableGuid,
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EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(Time->Daylight),
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&(Time->Daylight)
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);
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if (EFI_ERROR (Status)) {
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DEBUG((EFI_D_ERROR,"LibGetTime: ERROR: Daylight\n"));
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goto EXIT;
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}
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} else {
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// Got the daylight information
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Time->Daylight = *Daylight;
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FreePool(Daylight);
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// Adjust for the correct period
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if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
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// Convert to adjusted time, i.e. spring forwards one hour
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EpochSeconds += SEC_PER_HOUR;
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}
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}
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// Convert from internal 32-bit time to UEFI time
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EpochToEfiTime (EpochSeconds, Time);
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// Update the Capabilities info
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if (Capabilities != NULL) {
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// PL031 runs at frequency 1Hz
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Capabilities->Resolution = PL031_COUNTS_PER_SECOND;
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// Accuracy in ppm multiplied by 1,000,000, e.g. for 50ppm set 50,000,000
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Capabilities->Accuracy = (UINT32)PcdGet32 (PcdPL031RtcPpmAccuracy);
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// FALSE: Setting the time does not clear the values below the resolution level
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Capabilities->SetsToZero = FALSE;
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}
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EXIT:
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return Status;
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}
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/**
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Sets the current local time and date information.
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@param Time A pointer to the current time.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER A time field is out of range.
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@retval EFI_DEVICE_ERROR The time could not be set due due to hardware error.
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**/
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EFI_STATUS
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EFIAPI
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LibSetTime (
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IN EFI_TIME *Time
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)
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{
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EFI_STATUS Status;
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UINTN EpochSeconds;
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// Because the PL031 is a 32-bit counter counting seconds,
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// the maximum time span is just over 136 years.
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// Time is stored in Unix Epoch format, so it starts in 1970,
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// Therefore it can not exceed the year 2106.
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// This is not a problem for UEFI, as the current spec limits the years
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// to the range 1998 .. 2011
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// Check the input parameters' range.
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if ((Time->Year < 1998) ||
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(Time->Year > 2099) ||
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(Time->Month < 1 ) ||
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(Time->Month > 12 ) ||
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(!DayValid (Time) ) ||
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(Time->Hour > 23 ) ||
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(Time->Minute > 59 ) ||
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(Time->Second > 59 ) ||
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(Time->Nanosecond > 999999999) ||
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(!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||
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(Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))
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) {
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Status = EFI_INVALID_PARAMETER;
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goto EXIT;
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}
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// Initialize the hardware if not already done
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if (!mPL031Initialized) {
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Status = InitializePL031 ();
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if (EFI_ERROR (Status)) {
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goto EXIT;
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}
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}
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EpochSeconds = EfiTimeToEpoch (Time);
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// Adjust for the correct time zone, i.e. convert to UTC time zone
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if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
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EpochSeconds -= Time->TimeZone * SEC_PER_MIN;
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}
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// TODO: Automatic Daylight activation
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// Adjust for the correct period
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if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
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// Convert to un-adjusted time, i.e. fall back one hour
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EpochSeconds -= SEC_PER_HOUR;
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}
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// On some platforms we may have access to a battery backed up hardware clock.
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//
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// If such RTC exists then it must be updated first, before the PL031,
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// to minimise any time drift. This is important because the battery backed-up
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// RTC maintains the master time for the platform across reboots.
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//
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// If such RTC does not exist then the following function returns UNSUPPORTED.
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Status = ArmPlatformSysConfigSet (SYS_CFG_RTC, EpochSeconds);
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if ((EFI_ERROR (Status)) && (Status != EFI_UNSUPPORTED)){
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// Any status message except SUCCESS and UNSUPPORTED indicates a hardware failure.
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goto EXIT;
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}
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// Set the PL031
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MmioWrite32 (PL031_RTC_LR_LOAD_REGISTER, EpochSeconds);
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// The accesses to Variable Services can be very slow, because we may be writing to Flash.
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// Do this after having set the RTC.
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// Save the current time zone information into non-volatile storage
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Status = gRT->SetVariable (
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mTimeZoneVariableName,
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&gEfiGlobalVariableGuid,
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EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(Time->TimeZone),
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&(Time->TimeZone)
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);
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if (EFI_ERROR (Status)) {
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DEBUG((EFI_D_ERROR,"LibSetTime: ERROR: TimeZone\n"));
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goto EXIT;
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}
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// Save the current daylight information into non-volatile storage
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Status = gRT->SetVariable (
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mDaylightVariableName,
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&gEfiGlobalVariableGuid,
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EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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sizeof(Time->Daylight),
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&(Time->Daylight)
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);
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if (EFI_ERROR (Status)) {
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DEBUG((EFI_D_ERROR,"LibSetTime: ERROR: Daylight\n"));
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goto EXIT;
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}
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EXIT:
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return Status;
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}
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/**
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Returns the current wakeup alarm clock setting.
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@param Enabled Indicates if the alarm is currently enabled or disabled.
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@param Pending Indicates if the alarm signal is pending and requires acknowledgement.
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@param Time The current alarm setting.
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@retval EFI_SUCCESS The alarm settings were returned.
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@retval EFI_INVALID_PARAMETER Any parameter is NULL.
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@retval EFI_DEVICE_ERROR The wakeup time could not be retrieved due to a hardware error.
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**/
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EFI_STATUS
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EFIAPI
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LibGetWakeupTime (
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OUT BOOLEAN *Enabled,
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OUT BOOLEAN *Pending,
|
|
OUT EFI_TIME *Time
|
|
)
|
|
{
|
|
// Not a required feature
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
|
|
/**
|
|
Sets the system wakeup alarm clock time.
|
|
|
|
@param Enabled Enable or disable the wakeup alarm.
|
|
@param Time If Enable is TRUE, the time to set the wakeup alarm for.
|
|
|
|
@retval EFI_SUCCESS If Enable is TRUE, then the wakeup alarm was enabled. If
|
|
Enable is FALSE, then the wakeup alarm was disabled.
|
|
@retval EFI_INVALID_PARAMETER A time field is out of range.
|
|
@retval EFI_DEVICE_ERROR The wakeup time could not be set due to a hardware error.
|
|
@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
LibSetWakeupTime (
|
|
IN BOOLEAN Enabled,
|
|
OUT EFI_TIME *Time
|
|
)
|
|
{
|
|
// Not a required feature
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
This is the declaration of an EFI image entry point. This can be the entry point to an application
|
|
written to this specification, an EFI boot service driver, or an EFI runtime driver.
|
|
|
|
@param ImageHandle Handle that identifies the loaded image.
|
|
@param SystemTable System Table for this image.
|
|
|
|
@retval EFI_SUCCESS The operation completed successfully.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
LibRtcInitialize (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_HANDLE Handle;
|
|
|
|
// Setup the setters and getters
|
|
gRT->GetTime = LibGetTime;
|
|
gRT->SetTime = LibSetTime;
|
|
gRT->GetWakeupTime = LibGetWakeupTime;
|
|
gRT->SetWakeupTime = LibSetWakeupTime;
|
|
|
|
// Install the protocol
|
|
Handle = NULL;
|
|
Status = gBS->InstallMultipleProtocolInterfaces (
|
|
&Handle,
|
|
&gEfiRealTimeClockArchProtocolGuid, NULL,
|
|
NULL
|
|
);
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
/**
|
|
Fixup internal data so that EFI can be call in virtual mode.
|
|
Call the passed in Child Notify event and convert any pointers in
|
|
lib to virtual mode.
|
|
|
|
@param[in] Event The Event that is being processed
|
|
@param[in] Context Event Context
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
LibRtcVirtualNotifyEvent (
|
|
IN EFI_EVENT Event,
|
|
IN VOID *Context
|
|
)
|
|
{
|
|
//
|
|
// Only needed if you are going to support the OS calling RTC functions in virtual mode.
|
|
// You will need to call EfiConvertPointer (). To convert any stored physical addresses
|
|
// to virtual address. After the OS transitions to calling in virtual mode, all future
|
|
// runtime calls will be made in virtual mode.
|
|
//
|
|
return;
|
|
}
|