/** @file
  PCH Init Smm module for PCH specific SMI handlers.

  Copyright (c) 2019 Intel Corporation. All rights reserved. <BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#include "PchInitSmm.h"
#include <Register/PchRegs.h>
#include <Register/RegsUsb.h>
#include <Register/PchRegsSmbus.h>

GLOBAL_REMOVE_IF_UNREFERENCED EFI_SMM_IO_TRAP_DISPATCH2_PROTOCOL        *mPchIoTrap;
GLOBAL_REMOVE_IF_UNREFERENCED EFI_SMM_SX_DISPATCH2_PROTOCOL             *mSxDispatch;

GLOBAL_REMOVE_IF_UNREFERENCED PCH_NVS_AREA                              *mPchNvsArea;
GLOBAL_REMOVE_IF_UNREFERENCED UINT16                                    mAcpiBaseAddr;

//
// NOTE: The module variables of policy here are only valid in post time, but not runtime time.
//
GLOBAL_REMOVE_IF_UNREFERENCED PCH_CONFIG_HOB                            *mPchConfigHob;
GLOBAL_REMOVE_IF_UNREFERENCED SI_CONFIG_HOB_DATA                        *mSiConfigHobData;

//
// The reserved MMIO range to be used in Sx handler
//
GLOBAL_REMOVE_IF_UNREFERENCED EFI_PHYSICAL_ADDRESS                      mResvMmioBaseAddr;
GLOBAL_REMOVE_IF_UNREFERENCED UINTN                                     mResvMmioSize;

/**
  SMBUS Sx entry SMI handler.
**/
VOID
SmbusSxCallback (
  VOID
  )
{
  UINT64                      SmbusRegBase;
  UINT16                      SmbusIoBase;

  SmbusRegBase = PCI_SEGMENT_LIB_ADDRESS (
                   DEFAULT_PCI_SEGMENT_NUMBER_PCH,
                   DEFAULT_PCI_BUS_NUMBER_PCH,
                   PCI_DEVICE_NUMBER_PCH_SMBUS,
                   PCI_FUNCTION_NUMBER_PCH_SMBUS,
                   0
                   );

  if (PciSegmentRead32 (SmbusRegBase) == 0xFFFFFFFF) {
    return;
  }

  SmbusIoBase = PciSegmentRead16 (SmbusRegBase + R_SMBUS_CFG_BASE) & B_SMBUS_CFG_BASE_BAR;
  if (SmbusIoBase == 0) {
    return;
  }

  PciSegmentOr8 (SmbusRegBase + PCI_COMMAND_OFFSET, EFI_PCI_COMMAND_IO_SPACE);
  //
  // Clear SMBUS status and SMB_WAK_STS of GPE0
  //
  IoWrite8 (SmbusIoBase + R_SMBUS_IO_HSTS, B_SMBUS_IO_SMBALERT_STS);
  IoWrite32 (mAcpiBaseAddr + R_ACPI_IO_GPE0_STS_127_96, B_ACPI_IO_GPE0_STS_127_96_SMB_WAK);
}

/**
  Allocates reserved MMIO for Sx SMI handler use.
**/
VOID
AllocateReservedMmio (
  VOID
  )
{
  mResvMmioBaseAddr = PcdGet32 (PcdSiliconInitTempMemBaseAddr);
  mResvMmioSize     = PcdGet32 (PcdSiliconInitTempMemSize);
  DEBUG ((DEBUG_INFO, "mResvMmioBaseAddr %x, mResvMmioSize %x\n", mResvMmioBaseAddr, mResvMmioSize));
}

/**
  Initializes the PCH SMM handler for for PCIE hot plug support
  <b>PchInit SMM Module Entry Point</b>\n
  - <b>Introduction</b>\n
      The PchInitSmm module is a SMM driver that initializes the Intel Platform Controller Hub
      SMM requirements and services. It consumes the PCH_POLICY_HOB and SI_POLICY_HOB for expected
      configurations per policy.

  - <b>Details</b>\n
    This module provides SMI handlers to services PCIE HotPlug SMI, LinkActive SMI, and LinkEq SMI.
    And also provides port 0x61 emulation support, registers BIOS WP handler to process BIOSWP status,
    and registers SPI Async SMI handler to handler SPI Async SMI.
    This module also registers Sx SMI callback function to detail with GPIO Sx Isolation and LAN requirement.

  - @pre
    - PCH PCR base address configured
    - EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
      - This is to ensure that PCI MMIO and IO resource has been prepared and available for this driver to allocate.
    - EFI_SMM_BASE2_PROTOCOL
    - EFI_SMM_IO_TRAP_DISPATCH2_PROTOCOL
    - EFI_SMM_SX_DISPATCH2_PROTOCOL
    - EFI_SMM_CPU_PROTOCOL
    - @link _PCH_SMM_IO_TRAP_CONTROL_PROTOCOL PCH_SMM_IO_TRAP_CONTROL_PROTOCOL @endlink
    - @link _PCH_SMI_DISPATCH_PROTOCOL PCH_SMI_DISPATCH_PROTOCOL @endlink
    - @link _PCH_PCIE_SMI_DISPATCH_PROTOCOL PCH_PCIE_SMI_DISPATCH_PROTOCOL @endlink
    - @link _PCH_TCO_SMI_DISPATCH_PROTOCOL PCH_TCO_SMI_DISPATCH_PROTOCOL @endlink
    - @link _PCH_ESPI_SMI_DISPATCH_PROTOCOL PCH_ESPI_SMI_DISPATCH_PROTOCOL @endlink

  - <b>References</b>\n
    - @link _PCH_POLICY PCH_POLICY_HOB @endlink.
    - @link _SI_POLICY_STRUCT SI_POLICY_HOB @endlink.

  - <b>Integration Checklists</b>\n
    - Verify prerequisites are met. Porting Recommendations.
    - No modification of this module should be necessary
    - Any modification of this module should follow the PCH BIOS Specification and EDS

  @param[in] ImageHandle - Handle for the image of this driver
  @param[in] SystemTable - Pointer to the EFI System Table

  @retval EFI_SUCCESS    - PCH SMM handler was installed
**/
EFI_STATUS
EFIAPI
PchInitSmmEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS                                Status;
  PCH_NVS_AREA_PROTOCOL                     *PchNvsAreaProtocol;
  EFI_PEI_HOB_POINTERS                      HobPtr;

  DEBUG ((DEBUG_INFO, "PchInitSmmEntryPoint()\n"));

  Status = gSmst->SmmLocateProtocol (
                    &gEfiSmmIoTrapDispatch2ProtocolGuid,
                    NULL,
                    (VOID **) &mPchIoTrap
                    );
  ASSERT_EFI_ERROR (Status);

  Status = gSmst->SmmLocateProtocol (
                    &gEfiSmmSxDispatch2ProtocolGuid,
                    NULL,
                    (VOID**) &mSxDispatch
                    );
  ASSERT_EFI_ERROR (Status);

  Status = gBS->LocateProtocol (&gPchNvsAreaProtocolGuid, NULL, (VOID **) &PchNvsAreaProtocol);
  ASSERT_EFI_ERROR (Status);
  mPchNvsArea = PchNvsAreaProtocol->Area;

  //
  // Get PCH Data HOB.
  //
  HobPtr.Guid   = GetFirstGuidHob (&gPchConfigHobGuid);
  ASSERT (HobPtr.Guid != NULL);
  mPchConfigHob = (PCH_CONFIG_HOB *) GET_GUID_HOB_DATA (HobPtr.Guid);

  HobPtr.Guid   = GetFirstGuidHob (&gSiConfigHobGuid);
  ASSERT (HobPtr.Guid != NULL);
  mSiConfigHobData = (SI_CONFIG_HOB_DATA *) GET_GUID_HOB_DATA (HobPtr.Guid);

  mAcpiBaseAddr = PmcGetAcpiBase ();

  AllocateReservedMmio ();

  Status = InitializePchPcieSmm (ImageHandle, SystemTable);
  ASSERT_EFI_ERROR (Status);

  Status = InstallPchBiosWriteProtect (ImageHandle, SystemTable);
  ASSERT_EFI_ERROR (Status);

  Status = InstallPchSpiAsyncSmiHandler ();
  ASSERT_EFI_ERROR (Status);

  return EFI_SUCCESS;
}