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Enhance the RTC driver to not reserve the CMOS century register MSB. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8476 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
gikidy 2009-06-05 06:42:00 +00:00
parent d616bf7593
commit a47b308ad4
2 changed files with 3 additions and 52 deletions
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45
MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.c
View File

@ -158,11 +158,7 @@ PcRtcInit (
Time.Month = RtcRead (RTC_ADDRESS_MONTH);
Time.Year = RtcRead (RTC_ADDRESS_YEAR);
if (RtcTestCenturyRegister () == EFI_SUCCESS) {
Century = (UINT8) (RtcRead (RTC_ADDRESS_CENTURY) & 0x7f);
} else {
Century = RtcRead (RTC_ADDRESS_CENTURY);
}
Century = BcdToDecimal8 (RtcRead (RTC_ADDRESS_CENTURY));
//
// Set RTC configuration after get original time
@ -285,11 +281,7 @@ PcRtcGetTime (
Time->Month = RtcRead (RTC_ADDRESS_MONTH);
Time->Year = RtcRead (RTC_ADDRESS_YEAR);
if (RtcTestCenturyRegister () == EFI_SUCCESS) {
Century = (UINT8) (RtcRead (RTC_ADDRESS_CENTURY) & 0x7f);
} else {
Century = RtcRead (RTC_ADDRESS_CENTURY);
}
Century = BcdToDecimal8 (RtcRead (RTC_ADDRESS_CENTURY));
//
// Release RTC Lock.
@ -401,10 +393,6 @@ PcRtcSetTime (
RtcWrite (RTC_ADDRESS_DAY_OF_THE_MONTH, RtcTime.Day);
RtcWrite (RTC_ADDRESS_MONTH, RtcTime.Month);
RtcWrite (RTC_ADDRESS_YEAR, (UINT8) RtcTime.Year);
if (RtcTestCenturyRegister () == EFI_SUCCESS) {
Century = (UINT8) ((Century & 0x7f) | (RtcRead (RTC_ADDRESS_CENTURY) & 0x80));
}
RtcWrite (RTC_ADDRESS_CENTURY, Century);
//
@ -520,11 +508,7 @@ PcRtcGetWakeupTime (
Time->Year = RtcRead (RTC_ADDRESS_YEAR);
}
if (RtcTestCenturyRegister () == EFI_SUCCESS) {
Century = (UINT8) (RtcRead (RTC_ADDRESS_CENTURY) & 0x7f);
} else {
Century = RtcRead (RTC_ADDRESS_CENTURY);
}
Century = BcdToDecimal8 (RtcRead (RTC_ADDRESS_CENTURY));
//
// Release RTC Lock.
@ -663,29 +647,6 @@ PcRtcSetWakeupTime (
return EFI_SUCCESS;
}
/**
See if century register of RTC is valid.
@retval EFI_SUCCESS Century register is valid.
@retval EFI_DEVICE_ERROR Century register is NOT valid.
**/
EFI_STATUS
RtcTestCenturyRegister (
VOID
)
{
UINT8 Century;
UINT8 Temp;
Century = RtcRead (RTC_ADDRESS_CENTURY);
Temp = (UINT8) (RtcRead (RTC_ADDRESS_CENTURY) & 0x7f);
RtcWrite (RTC_ADDRESS_CENTURY, Century);
if (Temp == 0x19 || Temp == 0x20) {
return EFI_SUCCESS;
}
return EFI_DEVICE_ERROR;
}
/**
Checks an 8-bit BCD value, and converts to an 8-bit value if valid.

10
MdeModulePkg/Universal/PcatRealTimeClockRuntimeDxe/PcRtc.h
View File

@ -296,16 +296,6 @@ ConvertEfiTimeToRtcTime (
OUT UINT8 *Century
);
/**
See if centry register of RTC is valid.
@retval EFI_SUCCESS Century register is valid.
@retval EFI_DEVICE_ERROR Century register is NOT valid.
**/
EFI_STATUS
RtcTestCenturyRegister (
VOID
);
/**
Converts time read from RTC to EFI_TIME format defined by UEFI spec.