[edk2-devel] [edk2-platforms PATCH v4 3/7] Silicon/Marvell: Odyssey watchdog driver

["Narinder Dhillon" <ndhillon@marvell.com>]

From: Narinder Dhillon <ndhillon@marvell.com>

This patch adds watchdog driver for Odyssey SoC.

Signed-off-by: Narinder Dhillon <ndhillon@marvell.com>
---
 .../Drivers/Wdt/GtiWatchdogDxe/GtiWatchdog.c  | 408 ++++++++++++++++++
 .../Wdt/GtiWatchdogDxe/GtiWatchdogDxe.inf     |  45 ++
 2 files changed, 453 insertions(+)
 create mode 100644 Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdog.c
 create mode 100644 Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdogDxe.inf

diff --git a/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdog.c b/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdog.c
new file mode 100644
index 0000000000..c8f2888423
--- /dev/null
+++ b/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdog.c
@@ -0,0 +1,408 @@
+/** @file
+*
+* SPDX-License-Identifier: BSD-2-Clause-Patent
+* https://spdx.org/licenses
+*
+* Copyright (C) 2022 Marvell
+*
+* Source file for Marvell Watchdog driver
+*
+**/
+
+
+#include <PiDxe.h>
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/FdtClient.h>
+#include <Protocol/WatchdogTimer.h>
+
+#define GTI_CWD_WDOG(Core)    (FixedPcdGet64(PcdGtiWatchdogBase64) + 0x40000 + Core * 0x8)
+#define GTI_CWD_POKE(Core)    (FixedPcdGet64(PcdGtiWatchdogBase64) + 0x50000 + Core * 0x8)
+
+typedef union _GTI_CWD_WDOG_UNION {
+  UINT64          U64;
+  struct {
+    UINTN Mode   : 2;
+    UINTN State  : 2;
+    UINTN Len    : 16;
+    UINTN Cnt    : 24;
+    UINTN DStop  : 1;
+    UINTN GStop  : 1;
+    UINTN Rsvd   : 18;
+  } PACKED S;
+} GTI_CWD_WDOG_UNION;
+
+#define CWD_WDOG_MODE_RST     (BIT1 | BIT0)
+
+#define RST_BOOT_PNR_MUL(Val)  ((Val >> 33) & 0x1F)
+
+EFI_EVENT mGtiExitBootServicesEvent = (EFI_EVENT)NULL;
+UINT32  mSclk = 0;
+BOOLEAN mHardwarePlatform = TRUE;
+
+/**
+  Stop the GTI watchdog timer from counting down by disabling interrupts.
+**/
+STATIC
+VOID
+GtiWdtStop (
+  VOID
+  )
+{
+  GTI_CWD_WDOG_UNION Wdog;
+
+  MmioWrite64(GTI_CWD_POKE(0), 0);
+
+  Wdog.U64 = MmioRead64(GTI_CWD_WDOG(0));
+
+  // Disable WDT
+  if (Wdog.S.Mode != 0) {
+    Wdog.S.Len = 1;
+    Wdog.S.Mode = 0;
+    MmioWrite64 (GTI_CWD_WDOG(0), Wdog.U64);
+  }
+}
+
+/**
+  Starts the GTI WDT countdown by enabling interrupts.
+  The count down will start from the value stored in the Load register,
+  not from the value where it was previously stopped.
+**/
+STATIC
+VOID
+GtiWdtStart (
+  VOID
+  )
+{
+  GTI_CWD_WDOG_UNION Wdog;
+
+  // Reset the WDT
+  MmioWrite64 (GTI_CWD_POKE(0), 0);
+
+  Wdog.U64 = MmioRead64 (GTI_CWD_WDOG(0));
+
+  // Enable countdown
+  if (Wdog.S.Mode == 0) {
+    Wdog.S.Mode = CWD_WDOG_MODE_RST;
+    MmioWrite64 (GTI_CWD_WDOG(0), Wdog.U64);
+  }
+}
+
+/**
+    On exiting boot services we must make sure the SP805 Watchdog Timer
+    is stopped.
+**/
+VOID
+EFIAPI
+GtiExitBootServices (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  MmioWrite64 (GTI_CWD_POKE(0), 0);
+  GtiWdtStop ();
+}
+
+/**
+  This function registers the handler NotifyFunction so it is called every time
+  the watchdog timer expires.  It also passes the amount of time since the last
+  handler call to the NotifyFunction.
+  If NotifyFunction is not NULL and a handler is not already registered,
+  then the new handler is registered and EFI_SUCCESS is returned.
+  If NotifyFunction is NULL, and a handler is already registered,
+  then that handler is unregistered.
+  If an attempt is made to register a handler when a handler is already registered,
+  then EFI_ALREADY_STARTED is returned.
+  If an attempt is made to unregister a handler when a handler is not registered,
+  then EFI_INVALID_PARAMETER is returned.
+
+  @param  This             The EFI_TIMER_ARCH_PROTOCOL instance.
+  @param  NotifyFunction   The function to call when a timer interrupt fires. This
+                           function executes at TPL_HIGH_LEVEL. The DXE Core will
+                           register a handler for the timer interrupt, so it can know
+                           how much time has passed. This information is used to
+                           signal timer based events. NULL will unregister the handler.
+
+  @retval EFI_SUCCESS           The watchdog timer handler was registered.
+  @retval EFI_ALREADY_STARTED   NotifyFunction is not NULL, and a handler is already
+                                registered.
+  @retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
+                                previously registered.
+  @retval EFI_UNSUPPORTED       HW does not support this functionality.
+
+**/
+EFI_STATUS
+EFIAPI
+GtiWdtRegisterHandler (
+  IN CONST EFI_WATCHDOG_TIMER_ARCH_PROTOCOL   *This,
+  IN EFI_WATCHDOG_TIMER_NOTIFY                NotifyFunction
+  )
+{
+  // UNSUPPORTED - The hardware watchdog will reset the board
+  return EFI_UNSUPPORTED;
+}
+
+/**
+
+  This function adjusts the period of timer interrupts to the value specified
+  by TimerPeriod.  If the timer period is updated, then the selected timer
+  period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned.  If
+  the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.
+  If an error occurs while attempting to update the timer period, then the
+  timer hardware will be put back in its state prior to this call, and
+  EFI_DEVICE_ERROR is returned.  If TimerPeriod is 0, then the timer interrupt
+  is disabled.  This is not the same as disabling the CPU's interrupts.
+  Instead, it must either turn off the timer hardware, or it must adjust the
+  interrupt controller so that a CPU interrupt is not generated when the timer
+  interrupt fires.
+
+  @param  This             The EFI_TIMER_ARCH_PROTOCOL instance.
+  @param  TimerPeriod      The rate to program the timer interrupt in 100 nS units. If
+                           the timer hardware is not programmable, then EFI_UNSUPPORTED is
+                           returned. If the timer is programmable, then the timer period
+                           will be rounded up to the nearest timer period that is supported
+                           by the timer hardware. If TimerPeriod is set to 0, then the
+                           timer interrupts will be disabled.
+
+
+  @retval EFI_SUCCESS           The timer period was changed.
+  @retval EFI_UNSUPPORTED       The platform cannot change the period of the timer interrupt.
+  @retval EFI_DEVICE_ERROR      The timer period could not be changed due to a device error.
+
+**/
+EFI_STATUS
+EFIAPI
+GtiWdtSetTimerPeriod (
+  IN CONST EFI_WATCHDOG_TIMER_ARCH_PROTOCOL   *This,
+  IN UINT64                                   TimerPeriod   // In 100ns units
+  )
+{
+  UINT32             Clock;
+  UINT64             CountDown;
+  GTI_CWD_WDOG_UNION Wdog;
+
+  if (TimerPeriod == 0) {
+
+    // This is a watchdog stop request
+    GtiWdtStop();
+
+    return EFI_SUCCESS;
+  } else {
+    //
+    // The system is reset only after the WDT expires for the 3rd time
+    //
+
+    Clock = mSclk / 1000000; //MHz
+    CountDown = DivU64x32 (MultU64x32 (TimerPeriod, Clock), 30);
+
+    // WDT counts in 1024 cycle steps
+    // Only upper 16 bits can be used
+
+    Wdog.U64   = 0;
+    Wdog.S.Len = (CountDown + (0xFF << 10)) >> 18;
+    MmioWrite64 (GTI_CWD_WDOG(0), Wdog.U64);
+
+    // Start the watchdog
+    if (mHardwarePlatform == TRUE) {
+      GtiWdtStart();
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  This function retrieves the period of timer interrupts in 100 ns units,
+  returns that value in TimerPeriod, and returns EFI_SUCCESS.  If TimerPeriod
+  is NULL, then EFI_INVALID_PARAMETER is returned.  If a TimerPeriod of 0 is
+  returned, then the timer is currently disabled.
+
+  @param  This             The EFI_TIMER_ARCH_PROTOCOL instance.
+  @param  TimerPeriod      A pointer to the timer period to retrieve in 100 ns units. If
+                           0 is returned, then the timer is currently disabled.
+
+
+  @retval EFI_SUCCESS           The timer period was returned in TimerPeriod.
+  @retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+GtiWdtGetTimerPeriod (
+  IN CONST EFI_WATCHDOG_TIMER_ARCH_PROTOCOL   *This,
+  OUT UINT64                                  *TimerPeriod
+  )
+{
+  UINT32             Clock;
+  UINT64             CountDown;
+  UINT64             ReturnValue;
+  GTI_CWD_WDOG_UNION Wdog;
+
+  if (TimerPeriod == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Wdog.U64 = MmioRead64 (GTI_CWD_WDOG(0));
+
+  // Check if the watchdog is stopped
+  if (Wdog.S.Mode == 0) {
+    // It is stopped, so return zero.
+    ReturnValue = 0;
+  } else {
+    // Convert the Watchdog ticks into TimerPeriod
+    Clock = mSclk / 1000000; //MHz
+    CountDown = Wdog.S.Len << 18;
+
+    ReturnValue = MultU64x32(DivU64x32(3 * CountDown, Clock), 10); // usecs * 10
+  }
+
+  *TimerPeriod = ReturnValue;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Interface structure for the Watchdog Architectural Protocol.
+
+  @par Protocol Description:
+  This protocol provides a service to set the amount of time to wait
+  before firing the watchdog timer, and it also provides a service to
+  register a handler that is invoked when the watchdog timer fires.
+
+  @par When the watchdog timer fires, control will be passed to a handler
+  if one has been registered.  If no handler has been registered,
+  or the registered handler returns, then the system will be
+  reset by calling the Runtime Service ResetSystem().
+
+  @param RegisterHandler
+  Registers a handler that will be called each time the
+  watchdogtimer interrupt fires.  TimerPeriod defines the minimum
+  time between timer interrupts, so TimerPeriod will also
+  be the minimum time between calls to the registered
+  handler.
+  NOTE: If the watchdog resets the system in hardware, then
+        this function will not have any chance of executing.
+
+  @param SetTimerPeriod
+  Sets the period of the timer interrupt in 100 nS units.
+  This function is optional, and may return EFI_UNSUPPORTED.
+  If this function is supported, then the timer period will
+  be rounded up to the nearest supported timer period.
+
+  @param GetTimerPeriod
+  Retrieves the period of the timer interrupt in 100 nS units.
+
+**/
+EFI_WATCHDOG_TIMER_ARCH_PROTOCOL    gWatchdogTimer = {
+  (EFI_WATCHDOG_TIMER_REGISTER_HANDLER) GtiWdtRegisterHandler,
+  (EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD) GtiWdtSetTimerPeriod,
+  (EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD) GtiWdtGetTimerPeriod
+};
+
+/**
+  Initialize the state information for the Watchdog Timer Architectural Protocol.
+
+  @param  ImageHandle   of the loaded driver
+  @param  SystemTable   Pointer to the System Table
+
+  @retval EFI_SUCCESS           Protocol registered
+  @retval EFI_OUT_OF_RESOURCES  Cannot allocate protocol data structure
+  @retval EFI_DEVICE_ERROR      Hardware problems
+
+**/
+EFI_STATUS
+EFIAPI
+GtiWdtInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  Handle = NULL;
+  FDT_HANDLE  SclkHandle = 0;
+  FDT_HANDLE  RootHandle = 0;
+  CONST UINT32        *SclkFreq = NULL;
+  MRVL_FDT_CLIENT_PROTOCOL *FdtClient = NULL;
+  CONST CHAR8 *Platform;
+
+  DEBUG ((DEBUG_INFO, "GtiWdtInitialize: Start\n"));
+  // Stop the watchdog from triggering unexpectedly
+  GtiWdtStop ();
+
+  //
+  // Make sure the Watchdog Timer Architectural Protocol has not been installed in the system yet.
+  // This will avoid conflicts with the universal watchdog
+  //
+  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiWatchdogTimerArchProtocolGuid);
+
+  Status = gBS->LocateProtocol (&gMrvlFdtClientProtocolGuid,
+                                NULL,
+                                (VOID **)&FdtClient);
+
+  if (EFI_ERROR (Status) || (FdtClient == NULL)) {
+    DEBUG ((DEBUG_ERROR, "%a: ERROR: cannot locate: gMrvlFdtClientProtocolGuid\n", __func__));
+    return EFI_ABORTED;
+  }
+
+  Status = FdtClient->GetNode (FdtClient, "/soc@0/sclk", &SclkHandle);
+  if (EFI_ERROR (Status) || !SclkHandle) {
+    DEBUG ((DEBUG_ERROR, "%a: %s node not found!\n", __func__, L"/soc@0/sclk"));
+    return EFI_NOT_FOUND;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: Found: %s\n", __func__, L"/soc@0/sclk"));
+  Status = FdtClient->GetNodeProperty (FdtClient,
+                                        SclkHandle,
+                                        "clock-frequency",
+                                        (CONST VOID **)&SclkFreq,
+                                        NULL);
+  if (EFI_ERROR (Status) || NULL == SclkFreq) {
+    DEBUG ((DEBUG_ERROR, "%a: %s property not found!\n", __func__, L"\"clock-frequency\""));
+    return EFI_NO_MAPPING;
+  }
+
+  mSclk = FdtToCpu32(*SclkFreq);
+  DEBUG ((DEBUG_INFO, "%a: DT sclk = %d Mhz (0x%x)\n", __func__, mSclk/1000000, mSclk));
+
+  Status = FdtClient->GetNode (FdtClient, "/soc@0", &RootHandle);
+  if (!EFI_ERROR (Status) && RootHandle) {
+    Status = FdtClient->GetNodeProperty (FdtClient,
+                                        RootHandle,
+                                        "runplatform",
+                                        (CONST VOID **)&Platform,
+                                        NULL);
+    if (!EFI_ERROR (Status)) {
+      if (AsciiStrCmp (Platform, "HW_PLATFORM")) {
+        mHardwarePlatform = FALSE;
+        DEBUG ((DEBUG_INFO, "%a: Not a hardware platform\n", __func__));
+      }
+    }
+  }
+
+  // Register for an ExitBootServicesEvent
+  Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES,
+                             TPL_NOTIFY,
+                             GtiExitBootServices,
+                             NULL,
+                             &mGtiExitBootServicesEvent);
+  ASSERT_EFI_ERROR(Status);
+
+  // Install the Timer Architectural Protocol onto a new handle
+  Handle = NULL;
+  Status = gBS->InstallMultipleProtocolInterfaces(
+                  &Handle,
+                  &gEfiWatchdogTimerArchProtocolGuid, &gWatchdogTimer,
+                  NULL
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  DEBUG ((DEBUG_INFO, "GtiWdtInitialize: Exit\n"));
+
+  return EFI_SUCCESS;
+}
diff --git a/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdogDxe.inf b/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdogDxe.inf
new file mode 100644
index 0000000000..e3470f831c
--- /dev/null
+++ b/Silicon/Marvell/Drivers/Wdt/GtiWatchdogDxe/GtiWatchdogDxe.inf
@@ -0,0 +1,45 @@
+#/** @file
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#  https://spdx.org/licenses
+#
+#  Copyright (C) 2022 Marvell
+#
+#  Module definition file for Marvell Watchdog driver.
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = GtiWatchdogDxe
+  FILE_GUID                      = 789F5711-6FD3-4170-BE11-EE4000037EA8
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+
+  ENTRY_POINT                    = GtiWdtInitialize
+
+[Sources.common]
+  GtiWatchdog.c
+
+[Packages]
+  Silicon/Marvell/MarvellSiliconPkg/MarvellSiliconPkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  IoLib
+  PcdLib
+  UefiLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+
+[FixedPcd]
+  gMarvellSiliconTokenSpaceGuid.PcdGtiWatchdogBase64
+
+[Protocols]
+  gEfiWatchdogTimerArchProtocolGuid       #PRODUCES
+  gMrvlFdtClientProtocolGuid              #CONSUMED
+
+[Depex]
+  gMrvlFdtClientProtocolGuid
-- 
2.34.1



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