diff options
Diffstat (limited to 'PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c')
| -rw-r--r-- | PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c | 120 |
1 files changed, 109 insertions, 11 deletions
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c index 52af179417..64f36f6fbb 100644 --- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c +++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c @@ -3,6 +3,7 @@ Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
+Copyright (c) 2018 - 2020, ARM Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -10,6 +11,9 @@ SPDX-License-Identifier: BSD-2-Clause-Patent #include "PcRtc.h"
+extern UINTN mRtcIndexRegister;
+extern UINTN mRtcTargetRegister;
+
//
// Days of month.
//
@@ -54,38 +58,132 @@ IsWithinOneDay ( );
/**
+ Read RTC content through its registers using IO access.
+
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
+
+ @return The data of UINT8 type read from RTC.
+**/
+STATIC
+UINT8
+IoRtcRead (
+ IN UINTN Address
+ )
+{
+ IoWrite8 (
+ PcdGet8 (PcdRtcIndexRegister),
+ (UINT8)(Address | (UINT8)(IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80))
+ );
+ return IoRead8 (PcdGet8 (PcdRtcTargetRegister));
+}
+
+/**
+ Write RTC through its registers using IO access.
+
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
+ @param Data The content you want to write into RTC.
+
+**/
+STATIC
+VOID
+IoRtcWrite (
+ IN UINTN Address,
+ IN UINT8 Data
+ )
+{
+ IoWrite8 (
+ PcdGet8 (PcdRtcIndexRegister),
+ (UINT8)(Address | (UINT8)(IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80))
+ );
+ IoWrite8 (PcdGet8 (PcdRtcTargetRegister), Data);
+}
+
+/**
+ Read RTC content through its registers using MMIO access.
+
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
+
+ @return The data of UINT8 type read from RTC.
+**/
+STATIC
+UINT8
+MmioRtcRead (
+ IN UINTN Address
+ )
+{
+ MmioWrite8 (
+ mRtcIndexRegister,
+ (UINT8)(Address | (UINT8)(MmioRead8 (mRtcIndexRegister) & 0x80))
+ );
+ return MmioRead8 (mRtcTargetRegister);
+}
+
+/**
+ Write RTC through its registers using MMIO access.
+
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
+ @param Data The content you want to write into RTC.
+
+**/
+STATIC
+VOID
+MmioRtcWrite (
+ IN UINTN Address,
+ IN UINT8 Data
+ )
+{
+ MmioWrite8 (
+ mRtcIndexRegister,
+ (UINT8)(Address | (UINT8)(MmioRead8 (mRtcIndexRegister) & 0x80))
+ );
+ MmioWrite8 (mRtcTargetRegister, Data);
+}
+
+/**
Read RTC content through its registers.
- @param Address Address offset of RTC. It is recommended to use macros such as
- RTC_ADDRESS_SECONDS.
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
@return The data of UINT8 type read from RTC.
**/
+STATIC
UINT8
RtcRead (
- IN UINT8 Address
+ IN UINTN Address
)
{
- IoWrite8 (PcdGet8 (PcdRtcIndexRegister), (UINT8) (Address | (UINT8) (IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80)));
- return IoRead8 (PcdGet8 (PcdRtcTargetRegister));
+ if (FeaturePcdGet (PcdRtcUseMmio)) {
+ return MmioRtcRead (Address);
+ }
+
+ return IoRtcRead (Address);
}
/**
Write RTC through its registers.
- @param Address Address offset of RTC. It is recommended to use macros such as
- RTC_ADDRESS_SECONDS.
- @param Data The content you want to write into RTC.
+ @param Address Address offset of RTC. It is recommended to use
+ macros such as RTC_ADDRESS_SECONDS.
+ @param Data The content you want to write into RTC.
**/
+STATIC
VOID
RtcWrite (
- IN UINT8 Address,
+ IN UINTN Address,
IN UINT8 Data
)
{
- IoWrite8 (PcdGet8 (PcdRtcIndexRegister), (UINT8) (Address | (UINT8) (IoRead8 (PcdGet8 (PcdRtcIndexRegister)) & 0x80)));
- IoWrite8 (PcdGet8 (PcdRtcTargetRegister), Data);
+ if (FeaturePcdGet (PcdRtcUseMmio)) {
+ MmioRtcWrite (Address, Data);
+ } else {
+ IoRtcWrite (Address, Data);
+ }
}
/**
|