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/** @file
SSDT PCIe Support Library.
Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- PCI Firmware Specification - Revision 3.0
- ACPI 6.4 specification:
- s6.2.13 "_PRT (PCI Routing Table)"
- s6.1.1 "_ADR (Address)"
- linux kernel code
- Arm Base Boot Requirements v1.0
- Arm Base System Architecture v1.0
**/
#include <Library/AcpiLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Protocol/AcpiTable.h>
// Module specific include files.
#include <AcpiTableGenerator.h>
#include <ConfigurationManagerObject.h>
#include <ConfigurationManagerHelper.h>
#include <Library/AcpiHelperLib.h>
#include <Library/TableHelperLib.h>
#include <Library/AmlLib/AmlLib.h>
#include <Library/SsdtPcieSupportLib.h>
#include <Protocol/ConfigurationManagerProtocol.h>
#include "SsdtPcieSupportLibPrivate.h"
/** Generate Pci slots devices.
PCI Firmware Specification - Revision 3.3,
s4.8 "Generic ACPI PCI Slot Description" requests to describe the PCI slot
used. It should be possible to enumerate them, but this is additional
information.
@param [in] PciInfo Pci device information.
@param [in] MappingTable The mapping table structure.
@param [in, out] PciNode Pci node to amend.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
GeneratePciSlots (
IN CONST CM_ARM_PCI_CONFIG_SPACE_INFO *PciInfo,
IN CONST MAPPING_TABLE *MappingTable,
IN OUT AML_OBJECT_NODE_HANDLE PciNode
)
{
EFI_STATUS Status;
UINT32 Index;
UINT32 LastIndex;
UINT32 DeviceId;
CHAR8 AslName[AML_NAME_SEG_SIZE + 1];
AML_OBJECT_NODE_HANDLE DeviceNode;
ASSERT (MappingTable != NULL);
ASSERT (PciNode != NULL);
// Generic device name is "Dxx".
CopyMem (AslName, "Dxx_", AML_NAME_SEG_SIZE + 1);
LastIndex = MappingTable->LastIndex;
// There are at most 32 devices on a Pci bus.
if (LastIndex >= 32) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
for (Index = 0; Index < LastIndex; Index++) {
DeviceId = MappingTable->Table[Index];
AslName[AML_NAME_SEG_SIZE - 3] = AsciiFromHex (DeviceId & 0xF);
AslName[AML_NAME_SEG_SIZE - 2] = AsciiFromHex ((DeviceId >> 4) & 0xF);
// ASL:
// Device (Dxx) {
// Name (_ADR, <address value>)
// }
Status = AmlCodeGenDevice (AslName, PciNode, &DeviceNode);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
/* ACPI 6.4 specification, Table 6.2: "ADR Object Address Encodings"
High word-Device #, Low word-Function #. (for example, device 3,
function 2 is 0x00030002). To refer to all the functions on a device #,
use a function number of FFFF).
*/
Status = AmlCodeGenNameInteger (
"_ADR",
(DeviceId << 16) | 0xFFFF,
DeviceNode,
NULL
);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
// _SUN object is not generated as we don't know which slot will be used.
}
return Status;
}
/** Add an _OSC template method to the PciNode.
The _OSC method is provided as an AML blob. The blob is
parsed and attached at the end of the PciNode list of variable elements.
@param [in] PciInfo Pci device information.
@param [in, out] PciNode Pci node to amend.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Could not allocate memory.
**/
EFI_STATUS
EFIAPI
AddOscMethod (
IN CONST CM_ARM_PCI_CONFIG_SPACE_INFO *PciInfo,
IN OUT AML_OBJECT_NODE_HANDLE PciNode
)
{
EFI_STATUS Status;
EFI_STATUS Status1;
EFI_ACPI_DESCRIPTION_HEADER *SsdtPcieOscTemplate;
AML_ROOT_NODE_HANDLE OscTemplateRoot;
AML_OBJECT_NODE_HANDLE OscNode;
ASSERT (PciNode != NULL);
// Parse the Ssdt Pci Osc Template.
SsdtPcieOscTemplate = (EFI_ACPI_DESCRIPTION_HEADER *)
ssdtpcieosctemplate_aml_code;
OscNode = NULL;
OscTemplateRoot = NULL;
Status = AmlParseDefinitionBlock (
SsdtPcieOscTemplate,
&OscTemplateRoot
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"ERROR: SSDT-PCI-OSC: Failed to parse SSDT PCI OSC Template."
" Status = %r\n",
Status
));
return Status;
}
Status = AmlFindNode (OscTemplateRoot, "\\_OSC", &OscNode);
if (EFI_ERROR (Status)) {
goto error_handler;
}
Status = AmlDetachNode (OscNode);
if (EFI_ERROR (Status)) {
goto error_handler;
}
Status = AmlAttachNode (PciNode, OscNode);
if (EFI_ERROR (Status)) {
// Free the detached node.
AmlDeleteTree (OscNode);
goto error_handler;
}
error_handler:
// Cleanup
Status1 = AmlDeleteTree (OscTemplateRoot);
if (EFI_ERROR (Status1)) {
DEBUG ((
DEBUG_ERROR,
"ERROR: SSDT-PCI-OSC: Failed to cleanup AML tree."
" Status = %r\n",
Status1
));
// If Status was success but we failed to delete the AML Tree
// return Status1 else return the original error code, i.e. Status.
if (!EFI_ERROR (Status)) {
return Status1;
}
}
return Status;
}
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