Series comparison

The generic watchdog offset register is 48 bits wide, and can be set by
performing two 32-bit writes.

Add support for writing the high 16 bits of the offset register and
update the signature of the WatchdogWriteOffsetRegister function to take
a UINT64 value.

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h    |  6 +++++-
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 14 +++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
@@ -XXX,XX +XXX,XX @@
 /** @file
 *
+*  Copyright (c) 2023, Ampere Computing LLC. All rights reserved.<BR>
 *  Copyright (c) 2013-2017, ARM Limited. All rights reserved.
 *
 *  SPDX-License-Identifier: BSD-2-Clause-Patent
 *
+*  See Generic Watchdog specification in Arm Base System Architecture 1.0C:
+*  https://developer.arm.com/documentation/den0094/c/
 **/
 
 #ifndef GENERIC_WATCHDOG_H_
@@ -XXX,XX +XXX,XX @@
 
 // Control Frame:
 #define GENERIC_WDOG_CONTROL_STATUS_REG      ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x000)
-#define GENERIC_WDOG_OFFSET_REG              ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x008)
+#define GENERIC_WDOG_OFFSET_REG_LOW          ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x008)
+#define GENERIC_WDOG_OFFSET_REG_HIGH         ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x00C)
 #define GENERIC_WDOG_COMPARE_VALUE_REG_LOW   ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x010)
 #define GENERIC_WDOG_COMPARE_VALUE_REG_HIGH  ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x014)
 
diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
@@ -XXX,XX +XXX,XX @@
 /** @file
 *
+*  Copyright (c) 2023, Ampere Computing LLC. All rights reserved.<BR>
 *  Copyright (c) 2013-2018, ARM Limited. All rights reserved.
 *
 *  SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -XXX,XX +XXX,XX @@ STATIC UINTN  mTimerFrequencyHz = 0;
    It is therefore stored here. 0 means the timer is not running. */
 STATIC UINT64  mNumTimerTicks = 0;
 
+#define MAX_UINT48  0xFFFFFFFFFFFFULL
+
 STATIC EFI_HARDWARE_INTERRUPT2_PROTOCOL  *mInterruptProtocol;
 STATIC EFI_WATCHDOG_TIMER_NOTIFY         mWatchdogNotify;
 
 STATIC
 VOID
 WatchdogWriteOffsetRegister (
-  UINT32  Value
+  UINT64  Value
   )
 {
-  MmioWrite32 (GENERIC_WDOG_OFFSET_REG, Value);
+  MmioWrite32 (GENERIC_WDOG_OFFSET_REG_LOW, Value & MAX_UINT32);
+  MmioWrite32 (GENERIC_WDOG_OFFSET_REG_HIGH, (Value >> 32) & MAX_UINT16);
 }
 
 STATIC
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
   /* If the number of required ticks is greater than the max the watchdog's
      offset register (WOR) can hold, we need to manually compute and set
      the compare register (WCV) */
-  if (mNumTimerTicks > MAX_UINT32) {
+  if (mNumTimerTicks > MAX_UINT48) {
     /* We need to enable the watchdog *before* writing to the compare register,
        because enabling the watchdog causes an "explicit refresh", which
        clobbers the compare register (WCV). In order to make sure this doesn't
        trigger an interrupt, set the offset to max. */
-    WatchdogWriteOffsetRegister (MAX_UINT32);
+    WatchdogWriteOffsetRegister (MAX_UINT48);
     WatchdogEnable ();
     SystemCount = ArmGenericTimerGetSystemCount ();
     WatchdogWriteCompareRegister (SystemCount + mNumTimerTicks);
   } else {
-    WatchdogWriteOffsetRegister ((UINT32)mNumTimerTicks);
+    WatchdogWriteOffsetRegister (mNumTimerTicks);
     WatchdogEnable ();
   }
 
-- 
2.34.1

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#113210): https://edk2.groups.io/g/devel/message/113210
Mute This Topic: https://groups.io/mt/103537818/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

The calculation of the timer period was broken. Introduce a global
mTimerPeriod so the calculation can be removed. Since mTimerFrequencyHz
is only used in one place, remove the global and make it a local
variable. Do the same with mNumTimerTicks.

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 36 ++++++++++++++----------------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
@@ -XXX,XX +XXX,XX @@
    in a second */
 #define TIME_UNITS_PER_SECOND  10000000
 
-// Tick frequency of the generic timer basis of the generic watchdog.
-STATIC UINTN  mTimerFrequencyHz = 0;
-
 /* In cases where the compare register was set manually, information about
    how long the watchdog was asked to wait cannot be retrieved from hardware.
    It is therefore stored here. 0 means the timer is not running. */
-STATIC UINT64  mNumTimerTicks = 0;
+STATIC UINT64  mTimerPeriod = 0;
 
 #define MAX_UINT48  0xFFFFFFFFFFFFULL
 
@@ -XXX,XX +XXX,XX @@ WatchdogExitBootServicesEvent (
   )
 {
   WatchdogDisable ();
-  mNumTimerTicks = 0;
+  mNumTimerTicks      = 0;
+  mExitedBootServices = TRUE;
 }
 
 /* This function is called when the watchdog's first signal (WS0) goes high.
@@ -XXX,XX +XXX,XX @@ WatchdogInterruptHandler (
   )
 {
   STATIC CONST CHAR16  ResetString[] = L"The generic watchdog timer ran out.";
-  UINT64               TimerPeriod;
 
   WatchdogDisable ();
 
@@ -XXX,XX +XXX,XX @@ WatchdogInterruptHandler (
   // the timer period plus 1.
   //
   if (mWatchdogNotify != NULL) {
-    TimerPeriod = ((TIME_UNITS_PER_SECOND / mTimerFrequencyHz) * mNumTimerTicks);
-    mWatchdogNotify (TimerPeriod + 1);
+    mWatchdogNotify (mTimerPeriod + 1);
   }
 
   gRT->ResetSystem (
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
   IN UINT64                            TimerPeriod          // In 100ns units
   )
 {
-  UINTN  SystemCount;
+  UINTN   SystemCount;
+  UINT64  TimerFrequencyHz;
+  UINT64  NumTimerTicks;
 
   // if TimerPeriod is 0, this is a request to stop the watchdog.
   if (TimerPeriod == 0) {
-    mNumTimerTicks = 0;
+    mTimerPeriod = 0;
     WatchdogDisable ();
     return EFI_SUCCESS;
   }
 
   // Work out how many timer ticks will equate to TimerPeriod
-  mNumTimerTicks = (mTimerFrequencyHz * TimerPeriod) / TIME_UNITS_PER_SECOND;
+  TimerFrequencyHz = ArmGenericTimerGetTimerFreq ();
+  ASSERT (TimerFrequencyHz != 0);
+  mTimerPeriod  = TimerPeriod;
+  NumTimerTicks = (TimerFrequencyHz * TimerPeriod) / TIME_UNITS_PER_SECOND;
 
   /* If the number of required ticks is greater than the max the watchdog's
      offset register (WOR) can hold, we need to manually compute and set
      the compare register (WCV) */
-  if (mNumTimerTicks > MAX_UINT48) {
+  if (NumTimerTicks > MAX_UINT48) {
     /* We need to enable the watchdog *before* writing to the compare register,
        because enabling the watchdog causes an "explicit refresh", which
        clobbers the compare register (WCV). In order to make sure this doesn't
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
     WatchdogWriteOffsetRegister (MAX_UINT48);
     WatchdogEnable ();
     SystemCount = ArmGenericTimerGetSystemCount ();
-    WatchdogWriteCompareRegister (SystemCount + mNumTimerTicks);
+    WatchdogWriteCompareRegister (SystemCount + NumTimerTicks);
   } else {
-    WatchdogWriteOffsetRegister (mNumTimerTicks);
+    WatchdogWriteOffsetRegister (NumTimerTicks);
     WatchdogEnable ();
   }
 
@@ -XXX,XX +XXX,XX @@ WatchdogGetTimerPeriod (
     return EFI_INVALID_PARAMETER;
   }
 
-  *TimerPeriod = ((TIME_UNITS_PER_SECOND / mTimerFrequencyHz) * mNumTimerTicks);
+  *TimerPeriod = mTimerPeriod;
 
   return EFI_SUCCESS;
 }
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
      This will avoid conflicts with the universal watchdog */
   ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiWatchdogTimerArchProtocolGuid);
 
-  mTimerFrequencyHz = ArmGenericTimerGetTimerFreq ();
-  ASSERT (mTimerFrequencyHz != 0);
-
   // Install interrupt handler
   Status = mInterruptProtocol->RegisterInterruptSource (
                                  mInterruptProtocol,
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
                   );
   ASSERT_EFI_ERROR (Status);
 
-  mNumTimerTicks = 0;
+  mTimerPeriod = 0;
   WatchdogDisable ();
 
   return EFI_SUCCESS;
-- 
2.34.1

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#113211): https://edk2.groups.io/g/devel/message/113211
Mute This Topic: https://groups.io/mt/103537819/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

Update GenericWatchdogDxe to disable watchdog interaction after exiting
boot services. Also, move the mEfiExitBootServicesEvent event to the top
of the file with the other static variables.

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#113212): https://edk2.groups.io/g/devel/message/113212
Mute This Topic: https://groups.io/mt/103537820/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

Fixes and improvements to GenericWatchdogDxe.

PR: https://github.com/tianocore/edk2/pull/5176

Changes between v3 and v4:

- Check Interface Identification Register for architecture revision before
  setting the high offset register value.
- Use @par for reference.
- Move setting of EBS flag from patch 2/3 to 3/3.
- Disable the watchdog in the case that EBS has been called and the timer
  period is non-zero.

Rebecca Cran (3):
  ArmPkg: Update GenericWatchdogDxe to allow setting full 48-bit offset
  ArmPkg: Introduce global mTimerPeriod and remove calculation
  ArmPkg: Disable watchdog interaction after exiting boot services

ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h    | 11 +++-
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 69 +++++++++++++-------
 2 files changed, 54 insertions(+), 26 deletions(-)

-- 
2.34.1

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#114086): https://edk2.groups.io/g/devel/message/114086
Mute This Topic: https://groups.io/mt/103832317/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

The generic watchdog offset register is 48 bits wide, and can be set by
performing two 32-bit writes.

Add support for writing the high 16 bits of the offset register and
update the signature of the WatchdogWriteOffsetRegister function to take
a UINT64 value.

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h    | 11 +++++++++-
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 23 +++++++++++++++-----
 2 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdog.h
@@ -XXX,XX +XXX,XX @@
 /** @file
 *
+*  Copyright (c) 2023, Ampere Computing LLC. All rights reserved.<BR>
 *  Copyright (c) 2013-2017, ARM Limited. All rights reserved.
 *
 *  SPDX-License-Identifier: BSD-2-Clause-Patent
 *
+*  @par Reference(s):
+*  - Generic Watchdog specification in Arm Base System Architecture 1.0C:
+*    https://developer.arm.com/documentation/den0094/c/
 **/
 
 #ifndef GENERIC_WATCHDOG_H_
@@ -XXX,XX +XXX,XX @@
 
 // Control Frame:
 #define GENERIC_WDOG_CONTROL_STATUS_REG      ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x000)
-#define GENERIC_WDOG_OFFSET_REG              ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x008)
+#define GENERIC_WDOG_OFFSET_REG_LOW          ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x008)
+#define GENERIC_WDOG_OFFSET_REG_HIGH         ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x00C)
 #define GENERIC_WDOG_COMPARE_VALUE_REG_LOW   ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x010)
 #define GENERIC_WDOG_COMPARE_VALUE_REG_HIGH  ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0x014)
+#define GENERIC_WDOG_IID_REG                 ((UINTN)FixedPcdGet64 (PcdGenericWatchdogControlBase) + 0xFCC)
 
 // Values of bit 0 of the Control/Status Register
 #define GENERIC_WDOG_ENABLED   1
 #define GENERIC_WDOG_DISABLED  0
 
+#define GENERIC_WDOG_IID_REV_SHIFT  16
+#define GENERIC_WDOG_IID_REV_MASK   0xF
+
 #endif // GENERIC_WATCHDOG_H_
diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
@@ -XXX,XX +XXX,XX @@
 /** @file
 *
+*  Copyright (c) 2023, Ampere Computing LLC. All rights reserved.<BR>
 *  Copyright (c) 2013-2018, ARM Limited. All rights reserved.
 *
 *  SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -XXX,XX +XXX,XX @@ STATIC UINTN  mTimerFrequencyHz = 0;
    It is therefore stored here. 0 means the timer is not running. */
 STATIC UINT64  mNumTimerTicks = 0;
 
+STATIC UINT8  WatchdogRevision;
+
+#define MAX_UINT48  0xFFFFFFFFFFFFULL
+
 STATIC EFI_HARDWARE_INTERRUPT2_PROTOCOL  *mInterruptProtocol;
 STATIC EFI_WATCHDOG_TIMER_NOTIFY         mWatchdogNotify;
 
 STATIC
 VOID
 WatchdogWriteOffsetRegister (
-  UINT32  Value
+  UINT64  Value
   )
 {
-  MmioWrite32 (GENERIC_WDOG_OFFSET_REG, Value);
+  MmioWrite32 (GENERIC_WDOG_OFFSET_REG_LOW, Value & MAX_UINT32);
+  if (WatchdogRevision == 1) {
+    MmioWrite32 (GENERIC_WDOG_OFFSET_REG_HIGH, (Value >> 32) & MAX_UINT16);
+  }
 }
 
 STATIC
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
   /* If the number of required ticks is greater than the max the watchdog's
      offset register (WOR) can hold, we need to manually compute and set
      the compare register (WCV) */
-  if (mNumTimerTicks > MAX_UINT32) {
+  if (mNumTimerTicks > MAX_UINT48) {
     /* We need to enable the watchdog *before* writing to the compare register,
        because enabling the watchdog causes an "explicit refresh", which
        clobbers the compare register (WCV). In order to make sure this doesn't
        trigger an interrupt, set the offset to max. */
-    WatchdogWriteOffsetRegister (MAX_UINT32);
+    WatchdogWriteOffsetRegister (MAX_UINT48);
     WatchdogEnable ();
     SystemCount = ArmGenericTimerGetSystemCount ();
     WatchdogWriteCompareRegister (SystemCount + mNumTimerTicks);
   } else {
-    WatchdogWriteOffsetRegister ((UINT32)mNumTimerTicks);
+    WatchdogWriteOffsetRegister (mNumTimerTicks);
     WatchdogEnable ();
   }
 
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
 {
   EFI_STATUS  Status;
   EFI_HANDLE  Handle;
+  UINT32      WatchdogIId;
 
   Status = gBS->LocateProtocol (
                   &gHardwareInterrupt2ProtocolGuid,
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
                   );
   ASSERT_EFI_ERROR (Status);
 
-  mNumTimerTicks = 0;
+  mNumTimerTicks   = 0;
+  WatchdogIId      = MmioRead32 (GENERIC_WDOG_IID_REG);
+  WatchdogRevision = (WatchdogIId >> GENERIC_WDOG_IID_REV_SHIFT) & GENERIC_WDOG_IID_REV_MASK;
   WatchdogDisable ();
 
   return EFI_SUCCESS;
-- 
2.34.1

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#114088): https://edk2.groups.io/g/devel/message/114088
Mute This Topic: https://groups.io/mt/103832319/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 35 +++++++++-----------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
index XXXXXXX..XXXXXXX 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
@@ -XXX,XX +XXX,XX @@
    in a second */
 #define TIME_UNITS_PER_SECOND  10000000
 
-// Tick frequency of the generic timer basis of the generic watchdog.
-STATIC UINTN  mTimerFrequencyHz = 0;
-
 /* In cases where the compare register was set manually, information about
    how long the watchdog was asked to wait cannot be retrieved from hardware.
    It is therefore stored here. 0 means the timer is not running. */
-STATIC UINT64  mNumTimerTicks = 0;
+STATIC UINT64  mTimerPeriod = 0;
 
 STATIC UINT8  WatchdogRevision;
 
@@ -XXX,XX +XXX,XX @@ WatchdogExitBootServicesEvent (
   )
 {
   WatchdogDisable ();
-  mNumTimerTicks = 0;
+  mTimerPeriod        = 0;
 }
 
 /* This function is called when the watchdog's first signal (WS0) goes high.
@@ -XXX,XX +XXX,XX @@ WatchdogInterruptHandler (
   )
 {
   STATIC CONST CHAR16  ResetString[] = L"The generic watchdog timer ran out.";
-  UINT64               TimerPeriod;
 
   WatchdogDisable ();
 
@@ -XXX,XX +XXX,XX @@ WatchdogInterruptHandler (
   // the timer period plus 1.
   //
   if (mWatchdogNotify != NULL) {
-    TimerPeriod = ((TIME_UNITS_PER_SECOND / mTimerFrequencyHz) * mNumTimerTicks);
-    mWatchdogNotify (TimerPeriod + 1);
+    mWatchdogNotify (mTimerPeriod + 1);
   }
 
   gRT->ResetSystem (
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
   IN UINT64                            TimerPeriod          // In 100ns units
   )
 {
-  UINTN  SystemCount;
+  UINTN   SystemCount;
+  UINT64  TimerFrequencyHz;
+  UINT64  NumTimerTicks;
 
   // if TimerPeriod is 0, this is a request to stop the watchdog.
   if (TimerPeriod == 0) {
-    mNumTimerTicks = 0;
+    mTimerPeriod = 0;
     WatchdogDisable ();
     return EFI_SUCCESS;
   }
 
   // Work out how many timer ticks will equate to TimerPeriod
-  mNumTimerTicks = (mTimerFrequencyHz * TimerPeriod) / TIME_UNITS_PER_SECOND;
+  TimerFrequencyHz = ArmGenericTimerGetTimerFreq ();
+  ASSERT (TimerFrequencyHz != 0);
+  mTimerPeriod  = TimerPeriod;
+  NumTimerTicks = (TimerFrequencyHz * TimerPeriod) / TIME_UNITS_PER_SECOND;
 
   /* If the number of required ticks is greater than the max the watchdog's
      offset register (WOR) can hold, we need to manually compute and set
      the compare register (WCV) */
-  if (mNumTimerTicks > MAX_UINT48) {
+  if (NumTimerTicks > MAX_UINT48) {
     /* We need to enable the watchdog *before* writing to the compare register,
        because enabling the watchdog causes an "explicit refresh", which
        clobbers the compare register (WCV). In order to make sure this doesn't
@@ -XXX,XX +XXX,XX @@ WatchdogSetTimerPeriod (
     WatchdogWriteOffsetRegister (MAX_UINT48);
     WatchdogEnable ();
     SystemCount = ArmGenericTimerGetSystemCount ();
-    WatchdogWriteCompareRegister (SystemCount + mNumTimerTicks);
+    WatchdogWriteCompareRegister (SystemCount + NumTimerTicks);
   } else {
-    WatchdogWriteOffsetRegister (mNumTimerTicks);
+    WatchdogWriteOffsetRegister (NumTimerTicks);
     WatchdogEnable ();
   }
 
@@ -XXX,XX +XXX,XX @@ WatchdogGetTimerPeriod (
     return EFI_INVALID_PARAMETER;
   }
 
-  *TimerPeriod = ((TIME_UNITS_PER_SECOND / mTimerFrequencyHz) * mNumTimerTicks);
+  *TimerPeriod = mTimerPeriod;
 
   return EFI_SUCCESS;
 }
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
      This will avoid conflicts with the universal watchdog */
   ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiWatchdogTimerArchProtocolGuid);
 
-  mTimerFrequencyHz = ArmGenericTimerGetTimerFreq ();
-  ASSERT (mTimerFrequencyHz != 0);
-
   // Install interrupt handler
   Status = mInterruptProtocol->RegisterInterruptSource (
                                  mInterruptProtocol,
@@ -XXX,XX +XXX,XX @@ GenericWatchdogEntry (
                   );
   ASSERT_EFI_ERROR (Status);
 
-  mNumTimerTicks   = 0;
   WatchdogIId      = MmioRead32 (GENERIC_WDOG_IID_REG);
   WatchdogRevision = (WatchdogIId >> GENERIC_WDOG_IID_REV_SHIFT) & GENERIC_WDOG_IID_REV_MASK;
+  mTimerPeriod     = 0;
   WatchdogDisable ();
 
   return EFI_SUCCESS;
-- 
2.34.1

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#114087): https://edk2.groups.io/g/devel/message/114087
Mute This Topic: https://groups.io/mt/103832318/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-

Update GenericWatchdogDxe to disable watchdog interaction after exiting
boot services. Also, move the mEfiExitBootServicesEvent event to the top
of the file with the other static variables.

Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com>
---
 ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#114089): https://edk2.groups.io/g/devel/message/114089
Mute This Topic: https://groups.io/mt/103832320/1787277
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org]
-=-=-=-=-=-=-=-=-=-=-=-