/** @file
*
-* Copyright (c) 2011, ARM Limited. All rights reserved.
+* Copyright (c) 2011-2012, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
#include <PiDxe.h>
#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiLib.h>
-#include <Library/IoLib.h>
#include <Protocol/WatchdogTimer.h>
-#include <ArmPlatform.h>
#include <Drivers/SP805Watchdog.h>
-/**
- 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) SP805RegisterHandler,
- (EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD) SP805SetTimerPeriod,
- (EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD) SP805GetTimerPeriod
-};
-
EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL;
-BOOLEAN mSP805Initialized = FALSE;
-
EFI_STATUS
SP805Identify (
VOID
)
{
// Check if this is a PrimeCell Peripheral
- if( ( MmioRead8( SP805_WDOG_PCELL_ID0 ) != 0x0D )
- || ( MmioRead8( SP805_WDOG_PCELL_ID1 ) != 0xF0 )
- || ( MmioRead8( SP805_WDOG_PCELL_ID2 ) != 0x05 )
- || ( MmioRead8( SP805_WDOG_PCELL_ID3 ) != 0xB1 ) ) {
+ if ( (MmioRead8 (SP805_WDOG_PCELL_ID0) != 0x0D)
+ || (MmioRead8 (SP805_WDOG_PCELL_ID1) != 0xF0)
+ || (MmioRead8 (SP805_WDOG_PCELL_ID2) != 0x05)
+ || (MmioRead8 (SP805_WDOG_PCELL_ID3) != 0xB1)) {
return EFI_NOT_FOUND;
}
// Check if this PrimeCell Peripheral is the SP805 Watchdog Timer
- if( ( MmioRead8( SP805_WDOG_PERIPH_ID0 ) != 0x05 )
- || ( MmioRead8( SP805_WDOG_PERIPH_ID1 ) != 0x18 )
- || (( MmioRead8( SP805_WDOG_PERIPH_ID2 ) & 0x0000000F) != 0x04 )
- || ( MmioRead8( SP805_WDOG_PERIPH_ID3 ) != 0x00 ) ) {
+ if ( (MmioRead8 (SP805_WDOG_PERIPH_ID0) != 0x05)
+ || (MmioRead8 (SP805_WDOG_PERIPH_ID1) != 0x18)
+ || ((MmioRead8 (SP805_WDOG_PERIPH_ID2) & 0x0000000F) != 0x04)
+ || (MmioRead8 (SP805_WDOG_PERIPH_ID3) != 0x00)) {
return EFI_NOT_FOUND;
}
EFI_STATUS Status = EFI_SUCCESS;
UINT64 Ticks64bit;
- // Initialize the hardware if not already done
- if( !mSP805Initialized ) {
- Status = SP805Initialize();
- if (EFI_ERROR(Status)) {
- goto EXIT;
- }
- }
-
SP805Unlock();
if( TimerPeriod == 0 ) {
//
// WatchdogTicks = (TimerPeriod * SP805_CLOCK_FREQUENCY) / 20 MHz ;
- Ticks64bit = DivU64x32( MultU64x32( TimerPeriod, SP805_CLOCK_FREQUENCY ), 20000000 );
+ Ticks64bit = DivU64x32(MultU64x32(TimerPeriod, (UINTN)PcdGet32(PcdSP805WatchdogClockFrequencyInHz)), 20000000);
// The registers in the SP805 are only 32 bits
- if( Ticks64bit > SP805_MAX_TICKS ) {
+ if(Ticks64bit > (UINT64)0xFFFFFFFF) {
// We could load the watchdog with the maximum supported value but
// if a smaller value was requested, this could have the watchdog
// triggering before it was intended.
return EFI_INVALID_PARAMETER;
}
- // Initialize the hardware if not already done
- if( !mSP805Initialized ) {
- Status = SP805Initialize();
- if (EFI_ERROR(Status)) {
- goto EXIT;
- }
- }
-
// Check if the watchdog is stopped
if ( (MmioRead32(SP805_WDOG_CONTROL_REG) & SP805_WDOG_CTRL_INTEN) == 0 ) {
// It is stopped, so return zero.
*TimerPeriod = ReturnValue;
- EXIT:
return Status;
}
+/**
+ 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) SP805RegisterHandler,
+ (EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD) SP805SetTimerPeriod,
+ (EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD) SP805GetTimerPeriod
+};
+
/**
Initialize the state information for the Watchdog Timer Architectural Protocol.
**/
EFI_STATUS
+EFIAPI
SP805Initialize (
- VOID
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
+ EFI_HANDLE Handle;
// Check if the SP805 hardware watchdog module exists on board
Status = SP805Identify();
- if (EFI_ERROR( Status )) {
+ if (EFI_ERROR(Status)) {
Status = EFI_DEVICE_ERROR;
goto EXIT;
}
// Unlock access to the SP805 registers
- SP805Unlock();
+ SP805Unlock ();
// Stop the watchdog from triggering unexpectedly
- SP805Stop();
+ SP805Stop ();
// Set the watchdog to reset the board when triggered
- if ( (MmioRead32(SP805_WDOG_CONTROL_REG) & SP805_WDOG_CTRL_RESEN) == 0 ) {
- MmioOr32(SP805_WDOG_CONTROL_REG, SP805_WDOG_CTRL_RESEN);
+ if ((MmioRead32(SP805_WDOG_CONTROL_REG) & SP805_WDOG_CTRL_RESEN) == 0) {
+ MmioOr32 (SP805_WDOG_CONTROL_REG, SP805_WDOG_CTRL_RESEN);
}
// Prohibit any rogue access to SP805 registers
SP805Lock();
-
- mSP805Initialized = TRUE;
-
- EXIT:
- return Status;
-}
-
-EFI_STATUS
-EFIAPI
-SP805InstallProtocol (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
-{
- EFI_STATUS Status;
- EFI_HANDLE Handle;
-
+
//
// Make sure the Watchdog Timer Architectural Protocol has not been installed in the system yet.
// This will avoid conflicts with the universal watchdog
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