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/** @file
Library that contains common parts of WdtPei and WdtDxe. Not a standalone module.
@copyright
Copyright (c) 2010 - 2012 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
This file contains an 'Intel Peripheral Driver' and uniquely
identified as "Intel Reference Module" and is
licensed for Intel CPUs and chipsets under the terms of your
license agreement with Intel or your vendor. This file may
be modified by the user, subject to additional terms of the
license agreement
**/
#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000)
#include "EdkIIGlueBase.h"
#endif
#include "WdtCommon.h"
UINT8 mAllowExpectedReset = 0;
///
/// mWdtHobGuid is linked and used in WdtPei and WdtDxe
///
EFI_GUID mWdtHobGuid = WDT_HOB_GUID;
/**
Reads LPC bridge to get Watchdog Timer address
@param[in] none
@retval UINT32 Watchdog's address
**/
UINT32
WdtGetAddress (
VOID
)
{
UINT32 Address;
Address = (MmioRead32 (
MmPciAddress (0,
DEFAULT_PCI_BUS_NUMBER_PCH,
PCI_DEVICE_NUMBER_PCH_LPC,
PCI_FUNCTION_NUMBER_PCH_LPC,
R_PCH_LPC_ACPI_BASE)) & B_PCH_LPC_ACPI_BASE_BAR)
+ R_PCH_OC_WDT_CTL;
return Address;
}
/**
Reloads WDT with new timeout value and starts it. Also sets Unexpected Reset bit, which
causes the next reset to be treated as watchdog expiration - unless AllowKnownReset()
function was called too.
@param[in] TimeoutValue Time in seconds before WDT times out. Supported range = 1 - 1024.
@retval EFI_SUCCESS if everything's OK
@retval EFI_INVALID_PARAMETER if TimeoutValue parameter is wrong
**/
EFI_STATUS
EFIAPI
WdtReloadAndStart (
IN UINT32 TimeoutValue
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "\n(Wdt) ReloadAndStartTimer(%d)\n", TimeoutValue));
if ((TimeoutValue > B_PCH_OC_WDT_CTL_TOV_MASK) || (TimeoutValue == 0)) {
return EFI_INVALID_PARAMETER;
}
Readback = IoRead32 (WdtGetAddress ());
Readback |= (B_PCH_OC_WDT_CTL_EN | B_PCH_OC_WDT_CTL_FORCE_ALL | B_PCH_OC_WDT_CTL_ICCSURV);
if (mAllowExpectedReset == 0) {
Readback |= B_PCH_OC_WDT_CTL_UNXP_RESET_STS;
}
#if defined EFI_DEBUG && !defined USE_WDT_IN_DEBUG_BIOS
///
/// in Debug mode, WDT will not be turned on. This is to prevent platform reboots triggered
/// by WDT expiration, which can be expected when processor is halted for debugging
///
Readback &= ~(B_PCH_OC_WDT_CTL_EN | B_PCH_OC_WDT_CTL_FORCE_ALL | B_PCH_OC_WDT_CTL_UNXP_RESET_STS);
DEBUG ((EFI_D_INFO, "(Wdt) Wdt disabled in Debug BIOS\n"));
#endif
Readback &= ~(B_PCH_OC_WDT_CTL_TOV_MASK);
Readback |= ((TimeoutValue - 1) & B_PCH_OC_WDT_CTL_TOV_MASK);
IoWrite32 (WdtGetAddress (), Readback);
Readback |= B_PCH_OC_WDT_CTL_RLD;
IoWrite32 (WdtGetAddress (), Readback);
return EFI_SUCCESS;
}
/**
Disables WDT timer.
@param[in] None
@retval None
**/
VOID
EFIAPI
WdtDisable (
VOID
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "(Wdt) DisableTimer\n"));
Readback = IoRead32 (WdtGetAddress ());
Readback &= ~(B_PCH_OC_WDT_CTL_EN | B_PCH_OC_WDT_CTL_FORCE_ALL | B_PCH_OC_WDT_CTL_UNXP_RESET_STS);
IoWrite32 (WdtGetAddress (), Readback);
}
/**
Returns WDT failure status.
@param[in] None
@retval V_PCH_OC_WDT_CTL_STATUS_FAILURE If there was WDT expiration or unexpected reset
@retval V_PCH_OC_WDT_CTL_STATUS_OK Otherwise
**/
UINT8
EFIAPI
WdtCheckStatus (
VOID
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "(Wdt) CheckTimerStatus\n"));
Readback = IoRead32 (WdtGetAddress ());
DEBUG ((EFI_D_INFO, "(Wdt) Readback = (%x)\n", Readback));
if (Readback & B_PCH_OC_WDT_CTL_FAILURE_STS) {
DEBUG ((EFI_D_INFO, "(Wdt) Status = FAILURE\n"));
return V_PCH_OC_WDT_CTL_STATUS_FAILURE;
} else {
return V_PCH_OC_WDT_CTL_STATUS_OK;
}
}
/**
Normally, each reboot performed while watchdog runs is considered a failure.
This function allows platform to perform expected reboots with WDT running,
without being interpreted as failures.
In DXE phase, it is enough to call this function any time before reset.
In PEI phase, between calling this function and performing reset, ReloadAndStart()
must not be called.
@param[in] None
@retval None
**/
VOID
EFIAPI
WdtAllowKnownReset (
VOID
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "(Wdt) AllowKnownReset\n"));
mAllowExpectedReset = 1;
Readback = IoRead32 (WdtGetAddress ());
Readback &= ~(B_PCH_OC_WDT_CTL_UNXP_RESET_STS | B_PCH_OC_WDT_CTL_FORCE_ALL);
IoWrite32 (WdtGetAddress (), Readback);
}
/**
Returns information if WDT coverage for the duration of BIOS execution
was requested by an OS application
@param[in] None
@retval TRUE if WDT was requested
@retval FALSE if WDT was not requested
**/
UINT8
EFIAPI
IsWdtRequired (
VOID
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "(Wdt) IsWdtRequired"));
Readback = IoRead32 (WdtGetAddress ());
if ((Readback & B_PCH_OC_WDT_CTL_AFTER_POST) != 0) {
DEBUG ((EFI_D_INFO, " - yes\n"));
return TRUE;
} else {
DEBUG ((EFI_D_INFO, " - no\n"));
return FALSE;
}
}
/**
Returns WDT enabled/disabled status.
@param[in] None
@retval TRUE if WDT is enabled
@retval FALSE if WDT is disabled
**/
UINT8
EFIAPI
IsWdtEnabled (
VOID
)
{
UINT32 Readback;
DEBUG ((EFI_D_INFO, "(Wdt) IsWdtEnabled"));
Readback = IoRead32 (WdtGetAddress ());
if ((Readback & B_PCH_OC_WDT_CTL_EN) != 0) {
DEBUG ((EFI_D_INFO, " - yes\n"));
return TRUE;
} else {
DEBUG ((EFI_D_INFO, " - no\n"));
return FALSE;
}
}
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