diff options
Diffstat (limited to 'Platform/Intel/KabylakeOpenBoardPkg/Features/Tbt/Library/Private/PeiDTbtInitLib/PeiDTbtInitLib.c')
| -rw-r--r-- | Platform/Intel/KabylakeOpenBoardPkg/Features/Tbt/Library/Private/PeiDTbtInitLib/PeiDTbtInitLib.c | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/Features/Tbt/Library/Private/PeiDTbtInitLib/PeiDTbtInitLib.c b/Platform/Intel/KabylakeOpenBoardPkg/Features/Tbt/Library/Private/PeiDTbtInitLib/PeiDTbtInitLib.c new file mode 100644 index 0000000000..4521bff957 --- /dev/null +++ b/Platform/Intel/KabylakeOpenBoardPkg/Features/Tbt/Library/Private/PeiDTbtInitLib/PeiDTbtInitLib.c @@ -0,0 +1,572 @@ +/**@file
+ Thunderbolt(TM) Pei Library
+
+Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available under
+the terms and conditions of the BSD License that accompanies this distribution.
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#include <Library/PeiServicesLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/GpioLib.h>
+#include <GpioPinsSklLp.h>
+#include <GpioPinsSklH.h>
+#include <Library/TimerLib.h>
+#include <Library/IoLib.h>
+#include <Library/MmPciLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/GpioExpanderLib.h>
+#include <Ppi/ReadOnlyVariable2.h>
+
+#include <Base.h>
+#include <Library/TbtCommonLib.h>
+#include <TbtBoardInfo.h>
+#include <IndustryStandard/Pci22.h>
+#include <Library/PchCycleDecodingLib.h>
+#include <Ppi/PeiTbtPolicy.h>
+#include <Library/PciSegmentLib.h>
+#include <Library/PeiTbtPolicyLib.h>
+#include <Library/PchPmcLib.h>
+#include <Private/Library/PeiDTbtInitLib.h>
+
+/**
+Is host router (For dTBT) or End Point (For iTBT) present before sleep
+
+@param[in] ControllerType - DTBT_CONTROLLER or ITBT_CONTROLLER
+@param[in] Controller - Controller begin offset of CMOS
+
+@Retval TRUE There is a TBT HostRouter presented before sleep
+@Retval FALSE There is no TBT HostRouter presented before sleep
+
+BOOLEAN
+IsHostRouterPresentBeforeSleep(
+IN UINT8 ControllerType,
+IN UINT8 Controller
+)
+{
+ UINT8 SavedState;
+
+ SavedState = (UINT8)GetTbtHostRouterStatus();
+ if (ControllerType == DTBT_CONTROLLER){
+ return ((SavedState & (DTBT_SAVE_STATE_OFFSET << Controller)) == (DTBT_SAVE_STATE_OFFSET << Controller));
+ } else {
+ if (ControllerType == ITBT_CONTROLLER) {
+ return ((SavedState & (ITBT_SAVE_STATE_OFFSET << Controller)) == (ITBT_SAVE_STATE_OFFSET << Controller));
+ }
+ }
+ return 0;
+}
+**/
+
+/**
+Execute TBT PCIE2TBT_SX_EXIT_TBT_CONNECTED Mail Box Command for S4 mode with PreBootAclEnable
+
+@param[in] Bus Bus number for Host Router (DTBT)
+@param[in] Device Device number for Host Router (DTBT)
+@param[in] Function Function number for Host Router (DTBT)
+@param[in] Timeout Time out with 100 ms garnularity
+@Retval true if command executes succesfully
+**/
+BOOLEAN
+TbtSetPcie2TbtSxExitCommandWithPreBootAclEnable(
+ IN UINT8 Bus,
+ IN UINT8 Device,
+ IN UINT8 Function,
+ IN UINT32 Timeout
+)
+{
+ UINT64 Pcie2Tbt;
+ UINT64 Tbt2Pcie;
+ UINT32 RegisterValue;
+ BOOLEAN ReturnFlag;
+ UINT32 Command;
+
+ GET_TBT2PCIE_REGISTER_ADDRESS(0, Bus, Device, Function, Tbt2Pcie)
+ GET_PCIE2TBT_REGISTER_ADDRESS(0, Bus, Device, Function, Pcie2Tbt)
+
+// If PreBootAcl is Enable, we need to enable DATA bit while sending SX EXIT MAIL BOX Command
+ Command = (1 << 8) | PCIE2TBT_SX_EXIT_TBT_CONNECTED;
+ PciSegmentWrite32 (Pcie2Tbt, Command | PCIE2TBT_VLD_B);
+
+ ReturnFlag = InternalWaitforCommandCompletion(Tbt2Pcie, Timeout, TRUE, &RegisterValue);
+
+ PciSegmentWrite32(Pcie2Tbt, 0);
+
+ return ReturnFlag;
+}
+
+/**
+Set the Sleep Mode if the HR is up.
+@param[in] Bus Bus number for Host Router (DTBT)
+@param[in] Device Device number for Host Router (DTBT)
+@param[in] Function Function number for Host Router (DTBT)
+**/
+VOID
+TbtSetSxMode(
+IN UINT8 Bus,
+IN UINT8 Device,
+IN UINT8 Function,
+IN UINT8 TbtBootOn
+)
+{
+ UINT64 TbtUsDevId;
+ UINT64 Tbt2Pcie;
+ UINT32 RegVal;
+ UINT32 MaxLoopCount;
+ UINTN Delay;
+ UINT8 RetCode;
+ EFI_BOOT_MODE BootMode;
+ EFI_STATUS Status;
+
+ TbtUsDevId = PCI_SEGMENT_LIB_ADDRESS(0, Bus, Device, Function, 0);
+ GET_TBT2PCIE_REGISTER_ADDRESS(0, Bus, Device, Function, Tbt2Pcie)
+
+ MaxLoopCount = TBT_5S_TIMEOUT; // Wait 5 sec
+ Delay = 100 * 1000;
+ RetCode = 0x62;
+
+ Status = PeiServicesGetBootMode(&BootMode);
+ ASSERT_EFI_ERROR(Status);
+
+ if ((BootMode == BOOT_ON_S4_RESUME) && (TbtBootOn == 2)) {
+ MaxLoopCount = TBT_3S_TIMEOUT;
+ if (!TbtSetPcie2TbtSxExitCommandWithPreBootAclEnable(Bus, Device, Function, MaxLoopCount)) {
+ //
+ // Nothing to wait, HR is not responsive
+ //
+ return;
+ }
+ }
+ else {
+ if (!TbtSetPcie2TbtCommand(PCIE2TBT_SX_EXIT_TBT_CONNECTED, Bus, Device, Function, MaxLoopCount)) {
+ //
+ // Nothing to wait, HR is not responsive
+ //
+ return;
+ }
+ }
+
+ DEBUG((DEBUG_INFO, "Wait for Dev ID != 0xFF\n"));
+
+ while (MaxLoopCount-- > 0) {
+ //
+ // Check what HR still here
+ //
+ RegVal = PciSegmentRead32(Tbt2Pcie);
+ if (0xFFFFFFFF == RegVal) {
+ RetCode = 0x6F;
+ break;
+ }
+ //
+ // Check completion of TBT link
+ //
+ RegVal = PciSegmentRead32(TbtUsDevId);
+ if (0xFFFFFFFF != RegVal) {
+ RetCode = 0x61;
+ break;
+ }
+
+ MicroSecondDelay(Delay);
+ }
+
+ DEBUG((DEBUG_INFO, "Return code = 0x%x\n", RetCode));
+}
+/**
+ set tPCH25 Timing to 10 ms for DTBT.
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtSetTPch25Timing (
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+ DEBUG ((DEBUG_INFO, "DTbtSetTPch25Timing call Inside\n"));
+ UINT32 PchPwrmBase;
+
+ //
+ //During boot, reboot and wake tPCH25 Timing should be set to 10 ms
+ //
+ PchPwrmBaseGet (&PchPwrmBase);
+ MmioOr32 (
+ (UINTN) (PchPwrmBase + R_PCH_PWRM_CFG),
+ (BIT0 | BIT1)
+ );
+
+ DEBUG((DEBUG_INFO, "DTbtSetTPch25Timing call Return\n"));
+ return EFI_SUCCESS;
+}
+
+/**
+ Do ForcePower for DTBT Controller
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtForcePower (
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+
+ DEBUG ((DEBUG_INFO, "DTbtForcePower call Inside\n"));
+
+ if (PeiTbtConfig->DTbtCommonConfig.Gpio3ForcePwr) {
+ DEBUG((DEBUG_INFO, "ForcePwrGpio.GpioPad = %x \n", PeiTbtConfig-> DTbtControllerConfig.ForcePwrGpio.GpioPad));
+ ForceDtbtPower(PeiTbtConfig-> DTbtControllerConfig.ForcePwrGpio.GpioAccessType,PeiTbtConfig-> DTbtControllerConfig.ForcePwrGpio.Expander, PeiTbtConfig-> DTbtControllerConfig.ForcePwrGpio.GpioPad, PeiTbtConfig-> DTbtControllerConfig.ForcePwrGpio.GpioLevel);
+ DEBUG((DEBUG_INFO, "ForceDtbtPower asserted \n"));
+ MicroSecondDelay(PeiTbtConfig->DTbtCommonConfig.Gpio3ForcePwrDly * 1000);
+ DEBUG((DEBUG_INFO, "Delay after ForceDtbtPower = 0x%x ms \n", PeiTbtConfig->DTbtCommonConfig.Gpio3ForcePwrDly));
+ }
+
+ DEBUG ((DEBUG_INFO, "DTbtForcePower call Return\n"));
+ return EFI_SUCCESS;
+}
+
+/**
+ Clear VGA Registers for DTBT.
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtClearVgaRegisters (
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+ UINTN RpDev;
+ UINTN RpFunc;
+ EFI_STATUS Status;
+ UINT64 BridngeBaseAddress;
+ UINT16 Data16;
+
+ DEBUG ((DEBUG_INFO, "DTbtClearVgaRegisters call Inside\n"));
+
+ Status = EFI_SUCCESS;
+
+ Status = GetDTbtRpDevFun(PeiTbtConfig-> DTbtControllerConfig.Type, PeiTbtConfig-> DTbtControllerConfig.PcieRpNumber - 1, &RpDev, &RpFunc);
+ ASSERT_EFI_ERROR(Status);
+ //
+ // VGA Enable and VGA 16-bit decode registers of Bridge control register of Root port where
+ // Host router resides should be cleaned
+ //
+
+ BridngeBaseAddress = PCI_SEGMENT_LIB_ADDRESS(0, 0, (UINT32)RpDev, (UINT32)RpFunc, 0);
+ Data16 = PciSegmentRead16(BridngeBaseAddress + PCI_BRIDGE_CONTROL_REGISTER_OFFSET);
+ Data16 &= (~(EFI_PCI_BRIDGE_CONTROL_VGA | EFI_PCI_BRIDGE_CONTROL_VGA_16));
+ PciSegmentWrite16(BridngeBaseAddress + PCI_BRIDGE_CONTROL_REGISTER_OFFSET, Data16);
+
+ DEBUG ((DEBUG_INFO, "DTbtClearVgaRegisters call Return\n"));
+ return Status;
+}
+
+/**
+ Exectue Mail box command "Boot On".
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtBootOn(
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+ EFI_STATUS Status;
+ UINT32 OrgBusNumberConfiguration;
+ UINTN RpDev;
+ UINTN RpFunc;
+
+ DEBUG((DEBUG_INFO, "DTbtBootOn call Inside\n"));
+
+ Status = EFI_SUCCESS;
+
+ Status = GetDTbtRpDevFun(PeiTbtConfig-> DTbtControllerConfig.Type, PeiTbtConfig-> DTbtControllerConfig.PcieRpNumber - 1, &RpDev, &RpFunc);
+ ASSERT_EFI_ERROR(Status);
+ OrgBusNumberConfiguration = PciSegmentRead32 (PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET));
+ //
+ // Set Sec/Sub buses to 0xF0
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), 0x00F0F000);
+ //
+ //When Thunderbolt(TM) boot [TbtBootOn] is enabled in bios setup we need to do the below:
+ //Bios should send "Boot On" message through PCIE2TBT register
+ //The Boot On command as described above would include the command and acknowledge from FW (with the default timeout in BIOS),
+ //once the Boot On command is completed it is guaranteed that the AlpineRidge(AR) device is there and the PCI tunneling was done by FW,
+ //next step from BIOS is enumeration using SMI
+ //
+
+ if (PeiTbtConfig->DTbtCommonConfig.TbtBootOn > 0) {
+ //
+ // Exectue Mail box command "Boot On / Pre-Boot ACL"
+ //
+ //Command may be executed only during boot/reboot and not during Sx exit flow
+ if (PeiTbtConfig->DTbtCommonConfig.TbtBootOn == 1) {
+ if (!TbtSetPcie2TbtCommand(PCIE2TBT_BOOT_ON, 0xF0, 0, 0, TBT_5S_TIMEOUT)) {
+ //
+ // Nothing to wait, HR is not responsive
+ //
+ DEBUG((DEBUG_INFO, "<TbtPei> DTbtBootOn - Boot On message sent failed \n"));
+ }
+ }
+ if (PeiTbtConfig->DTbtCommonConfig.TbtBootOn == 2) {
+ if (!TbtSetPcie2TbtCommand(PCIE2TBT_PREBOOTACL, 0xF0, 0, 0, TBT_3S_TIMEOUT)) {
+ //
+ // Nothing to wait, HR is not responsive
+ //
+ DEBUG((DEBUG_INFO, "<TbtPei> DTbtBootOn - Pre-Boot ACL message sent failed \n"));
+ }
+ }
+ }
+ //
+ // Reset Sec/Sub buses to original value
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), OrgBusNumberConfiguration);
+
+ DEBUG((DEBUG_INFO, "DTbtBootOn call Return\n"));
+ return Status;
+}
+
+/**
+ Exectue Mail box command "USB On".
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtUsbOn(
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+ EFI_STATUS Status;
+ UINTN RpDev;
+ UINTN RpFunc;
+ UINT32 OrgBusNumberConfiguration;
+ UINT64 TbtBaseAddress;
+ UINT32 MaxWaitIter;
+ UINT32 RegVal;
+ EFI_BOOT_MODE BootMode;
+
+ DEBUG((DEBUG_INFO, "DTbtUsbOn call Inside\n"));
+
+ Status = EFI_SUCCESS;
+
+ Status = GetDTbtRpDevFun(PeiTbtConfig-> DTbtControllerConfig.Type, PeiTbtConfig-> DTbtControllerConfig.PcieRpNumber - 1, &RpDev, &RpFunc);
+ ASSERT_EFI_ERROR(Status);
+ OrgBusNumberConfiguration = PciSegmentRead32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET));
+ //
+ // Set Sec/Sub buses to 0xF0
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), 0x00F0F000);
+
+ //
+ //When Thunderbolt(TM) Usb boot [TbtUsbOn] is enabled in bios setup we need to do the below:
+ //Bios should send "Usb On" message through PCIE2TBT register
+ //The Usb On command as described above would include the command and acknowledge from FW (with the default timeout in BIOS),
+ //once the Usb On command is completed it is guaranteed that the AlpineRidge(AR) device is there and the PCI tunneling was done by FW,
+ //next step from BIOS is enumeration using SMI
+ //
+ if (PeiTbtConfig->DTbtCommonConfig.TbtUsbOn) {
+ if (PeiTbtConfig->DTbtCommonConfig.TbtBootOn > 0) {
+ MaxWaitIter = 50; // Wait 5 sec
+ TbtBaseAddress = PCI_SEGMENT_LIB_ADDRESS(0, 0xF0, 0, 0, 0);
+ //
+ // Driver clears the PCIe2TBT Valid bit to support two consicutive mailbox commands
+ //
+ PciSegmentWrite32(TbtBaseAddress + PCIE2TBT_DTBT_R, 0);
+ DEBUG((DEBUG_INFO, "TbtBaseAddress + PCIE2TBT_DTBT_R = 0x%lx \n", TbtBaseAddress + PCIE2TBT_DTBT_R));
+ while (MaxWaitIter-- > 0) {
+ RegVal = PciSegmentRead32(TbtBaseAddress + TBT2PCIE_DTBT_R);
+ if (0xFFFFFFFF == RegVal) {
+ //
+ // Device is not here return now
+ //
+ DEBUG((DEBUG_INFO, "TBT device is not present \n"));
+ break;
+ }
+
+ if (!(RegVal & TBT2PCIE_DON_R)) {
+ break;
+ }
+ MicroSecondDelay(100 * 1000);
+ }
+ }
+
+ Status = PeiServicesGetBootMode(&BootMode);
+ ASSERT_EFI_ERROR(Status);
+
+ //
+ // Exectue Mail box command "Usb On"
+ //
+ //Command may be executed only during boot/reboot and not during S3 exit flow
+ //In case of S4 Exit send USB ON cmd only if Host Router was inactive/not present during S4 entry
+ if ((BootMode == BOOT_ON_S4_RESUME) ) {
+ // USB_ON cmd not required
+ } else {
+ if (!TbtSetPcie2TbtCommand(PCIE2TBT_USB_ON, 0xF0, 0, 0, TBT_5S_TIMEOUT)) {
+ //
+ // Nothing to wait, HR is not responsive
+ //
+ DEBUG((DEBUG_INFO, "<TbtPei> TbtBootSupport - Usb On message sent failed \n"));
+ }
+ }
+ }
+ //
+ // Reset Sec/Sub buses to original value
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), OrgBusNumberConfiguration);
+
+ DEBUG((DEBUG_INFO, "DTbtUsbOn call return\n"));
+ return Status;
+}
+
+/**
+ Exectue Mail box command "Sx Exit".
+
+ @param[in] PEI_TBT_POLICY PeiTbtConfig
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval EFI_UNSUPPORTED dTBT is not supported.
+**/
+EFI_STATUS
+EFIAPI
+DTbtSxExitFlow(
+ IN PEI_TBT_POLICY *PeiTbtConfig
+)
+{
+ EFI_STATUS Status;
+ UINT32 OrgBusNumberConfiguration;
+ UINTN RpDev;
+ UINTN RpFunc;
+ UINT32 Count;
+
+ DEBUG((DEBUG_INFO, "DTbtSxExitFlow call Inside\n"));
+
+ Status = EFI_SUCCESS;
+ Count = 0;
+
+ Status = GetDTbtRpDevFun(PeiTbtConfig-> DTbtControllerConfig.Type, PeiTbtConfig-> DTbtControllerConfig.PcieRpNumber - 1, &RpDev, &RpFunc);
+ ASSERT_EFI_ERROR(Status);
+ OrgBusNumberConfiguration = PciSegmentRead32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET));
+ //
+ // Set Sec/Sub buses to 0xF0
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), 0x00F0F000);
+
+ if ( (PeiTbtConfig->DTbtCommonConfig.TbtBootOn == 2)) {
+ //
+ // WA: When system with TBT 3.1 device, resume SX system need to wait device ready. In document that maximum time out should be 500ms.
+ //
+ while (PciSegmentRead32(PCI_SEGMENT_LIB_ADDRESS(0, 0xf0, 0x0, 0x0, 0x08)) == 0xffffffff) { //End Device will be with Device Number 0x0, Function Number 0x0.
+ MicroSecondDelay(STALL_ONE_MICRO_SECOND * 1000); // 1000usec
+ Count++;
+ if (Count > 10000) { //Allowing Max Delay of 10 sec for CFL-S board.
+ break;
+ }
+ }
+
+ //
+ // Upon wake, if BIOS saved pre-Sx Host Router state as active (system went to sleep with
+ // attached devices), BIOS should:
+ // 1. Execute "Sx_Exit_TBT_Connected" mailbox command.
+ // 2. If procedure above returns true, BIOS should perform "wait for fast link bring-up" loop
+ // 3. Continue regular wake flow.
+ //
+ //
+ // Exectue Mail box command and perform "wait for fast link bring-up" loop
+ //
+ TbtSetSxMode(0xF0, 0, 0, PeiTbtConfig->DTbtCommonConfig.TbtBootOn);
+ }
+ //
+ // Reset Sec/Sub buses to original value
+ //
+ PciSegmentWrite32(PCI_SEGMENT_LIB_ADDRESS (0, 0, RpDev, RpFunc, PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET), OrgBusNumberConfiguration);
+
+ DEBUG((DEBUG_INFO, "DTbtSxExitFlow call Return\n"));
+ return Status;
+}
+
+
+/**
+ Initialize Thunderbolt(TM)
+
+ @retval EFI_SUCCESS The function completes successfully
+ @retval others
+**/
+EFI_STATUS
+EFIAPI
+TbtInit (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ PEI_TBT_POLICY *PeiTbtConfig;
+
+ //
+ // Get the TBT Policy
+ //
+ Status = PeiServicesLocatePpi (
+ &gPeiTbtPolicyPpiGuid,
+ 0,
+ NULL,
+ (VOID **) &PeiTbtConfig
+ );
+ if (EFI_ERROR(Status)) {
+ DEBUG ((DEBUG_ERROR, " gPeiTbtPolicyPpiGuid Not installed!!!\n"));
+ }
+ ASSERT_EFI_ERROR (Status);
+ //
+ // Exectue Mail box command "Boot On"
+ //
+ Status = DTbtBootOn (PeiTbtConfig);
+ //
+ // Exectue Mail box command "Usb On"
+ //
+ Status = DTbtUsbOn (PeiTbtConfig);
+ //
+ //During boot, reboot and wake (bits [1:0]) of PCH PM_CFG register should be
+ //set to 11b - 10 ms (default value is 0b - 10 us)
+ //
+ Status = DTbtSetTPch25Timing (PeiTbtConfig);
+ //
+ // Configure Tbt Force Power
+ //
+ Status = DTbtForcePower (PeiTbtConfig);
+ //
+ // VGA Enable and VGA 16-bit decode registers of Bridge control register of Root port where
+ // Host router resides should be cleaned
+ //
+ Status = DTbtClearVgaRegisters (PeiTbtConfig);
+ //
+ // Upon wake, if BIOS saved pre-Sx Host Router state as active (system went to sleep with
+ // attached devices), BIOS should:
+ // 1. Execute "Sx_Exit_TBT_Connected" mailbox command.
+ // 2. If procedure above returns true, BIOS should perform "wait for fast link bring-up" loop
+ // 3. Continue regular wake flow.
+ //
+ Status = DTbtSxExitFlow (PeiTbtConfig);
+ return EFI_SUCCESS;
+}
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