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/** @file
Legacy Interrupt Support
Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "LegacyInterrupt.h"
//
// Handle for the Legacy Interrupt Protocol instance produced by this driver
//
STATIC EFI_HANDLE mLegacyInterruptHandle = NULL;
//
// Legacy Interrupt Device number (0x01 on piix4, 0x1f on q35/mch)
//
STATIC UINT8 mLegacyInterruptDevice;
//
// The Legacy Interrupt Protocol instance produced by this driver
//
STATIC EFI_LEGACY_INTERRUPT_PROTOCOL mLegacyInterrupt = {
GetNumberPirqs,
GetLocation,
ReadPirq,
WritePirq
};
STATIC UINT8 PirqReg[MAX_PIRQ_NUMBER] = { PIRQA, PIRQB, PIRQC, PIRQD, PIRQE, PIRQF, PIRQG, PIRQH };
/**
Return the number of PIRQs supported by this chipset.
@param[in] This Pointer to LegacyInterrupt Protocol
@param[out] NumberPirqs The pointer to return the max IRQ number supported
@retval EFI_SUCCESS Max PIRQs successfully returned
**/
EFI_STATUS
EFIAPI
GetNumberPirqs (
IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,
OUT UINT8 *NumberPirqs
)
{
*NumberPirqs = MAX_PIRQ_NUMBER;
return EFI_SUCCESS;
}
/**
Return PCI location of this device.
$PIR table requires this info.
@param[in] This - Protocol instance pointer.
@param[out] Bus - PCI Bus
@param[out] Device - PCI Device
@param[out] Function - PCI Function
@retval EFI_SUCCESS Bus/Device/Function returned
**/
EFI_STATUS
EFIAPI
GetLocation (
IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,
OUT UINT8 *Bus,
OUT UINT8 *Device,
OUT UINT8 *Function
)
{
*Bus = LEGACY_INT_BUS;
*Device = mLegacyInterruptDevice;
*Function = LEGACY_INT_FUNC;
return EFI_SUCCESS;
}
/**
Builds the PCI configuration address for the register specified by PirqNumber
@param[in] PirqNumber - The PIRQ number to build the PCI configuration address for
@return The PCI Configuration address for the PIRQ
**/
UINTN
GetAddress (
UINT8 PirqNumber
)
{
return PCI_LIB_ADDRESS (
LEGACY_INT_BUS,
mLegacyInterruptDevice,
LEGACY_INT_FUNC,
PirqReg[PirqNumber]
);
}
/**
Read the given PIRQ register
@param[in] This Protocol instance pointer
@param[in] PirqNumber The Pirq register 0 = A, 1 = B etc
@param[out] PirqData Value read
@retval EFI_SUCCESS Decoding change affected.
@retval EFI_INVALID_PARAMETER Invalid PIRQ number
**/
EFI_STATUS
EFIAPI
ReadPirq (
IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,
IN UINT8 PirqNumber,
OUT UINT8 *PirqData
)
{
if (PirqNumber >= MAX_PIRQ_NUMBER) {
return EFI_INVALID_PARAMETER;
}
*PirqData = PciRead8 (GetAddress (PirqNumber));
*PirqData = (UINT8)(*PirqData & 0x7f);
return EFI_SUCCESS;
}
/**
Write the given PIRQ register
@param[in] This Protocol instance pointer
@param[in] PirqNumber The Pirq register 0 = A, 1 = B etc
@param[out] PirqData Value to write
@retval EFI_SUCCESS Decoding change affected.
@retval EFI_INVALID_PARAMETER Invalid PIRQ number
**/
EFI_STATUS
EFIAPI
WritePirq (
IN EFI_LEGACY_INTERRUPT_PROTOCOL *This,
IN UINT8 PirqNumber,
IN UINT8 PirqData
)
{
if (PirqNumber >= MAX_PIRQ_NUMBER) {
return EFI_INVALID_PARAMETER;
}
PciWrite8 (GetAddress (PirqNumber), PirqData);
return EFI_SUCCESS;
}
/**
Initialize Legacy Interrupt support
@retval EFI_SUCCESS Successfully initialized
**/
EFI_STATUS
LegacyInterruptInstall (
VOID
)
{
UINT16 HostBridgeDevId;
EFI_STATUS Status;
//
// Make sure the Legacy Interrupt Protocol is not already installed in the system
//
ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyInterruptProtocolGuid);
//
// Query Host Bridge DID to determine platform type, then set device number
//
HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
switch (HostBridgeDevId) {
case INTEL_82441_DEVICE_ID:
mLegacyInterruptDevice = LEGACY_INT_DEV_PIIX4;
break;
case INTEL_Q35_MCH_DEVICE_ID:
mLegacyInterruptDevice = LEGACY_INT_DEV_Q35;
break;
default:
DEBUG ((
DEBUG_ERROR,
"%a: Unknown Host Bridge Device ID: 0x%04x\n",
__func__,
HostBridgeDevId
));
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
//
// Make a new handle and install the protocol
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mLegacyInterruptHandle,
&gEfiLegacyInterruptProtocolGuid,
&mLegacyInterrupt,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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