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/** @file
Arm boot architecture parser.
Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- linux/Documentation/devicetree/bindings/arm/psci.yaml
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/FdtLib.h>
#include "FdtHwInfoParser.h"
#include "CmObjectDescUtility.h"
#include "Arm/BootArch/ArmBootArchParser.h"
/** List of "compatible" property values for Psci nodes.
Other "compatible" values are not supported by this module.
*/
STATIC CONST COMPATIBILITY_STR PsciCompatibleStr[] = {
{ "arm,psci-0.2" },
{ "arm,psci" }
};
/** COMPATIBILITY_INFO structure for the PsciCompatibleInfo.
*/
STATIC CONST COMPATIBILITY_INFO PsciCompatibleInfo = {
ARRAY_SIZE (PsciCompatibleStr),
PsciCompatibleStr
};
/** List of PSCI method strings.
*/
STATIC CONST CHAR8 *PsciMethod[] = {
"smc",
"hvc"
};
/** Parse a Psci node.
@param [in] Fdt Pointer to a Flattened Device Tree (Fdt).
@param [in] PsciNode Offset of a Psci node.
@param [in] BootArchInfo The CM_ARM_BOOT_ARCH_INFO to populate.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
STATIC
EFI_STATUS
EFIAPI
PsciNodeParser (
IN CONST VOID *Fdt,
IN INT32 PsciNode,
IN CM_ARM_BOOT_ARCH_INFO *BootArchInfo
)
{
CONST VOID *Data;
INT32 DataSize;
if ((Fdt == NULL) ||
(BootArchInfo == NULL))
{
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
// Default to parking protocol
BootArchInfo->BootArchFlags = 0;
Data = FdtGetProp (Fdt, PsciNode, "method", &DataSize);
if ((Data == NULL) || (DataSize < 0)) {
ASSERT (0);
return EFI_ABORTED;
}
// Check PSCI conduit.
if (AsciiStrnCmp (Data, PsciMethod[0], DataSize) == 0) {
BootArchInfo->BootArchFlags = EFI_ACPI_6_3_ARM_PSCI_COMPLIANT;
} else if (AsciiStrnCmp (Data, PsciMethod[1], DataSize) == 0) {
BootArchInfo->BootArchFlags = (EFI_ACPI_6_3_ARM_PSCI_COMPLIANT |
EFI_ACPI_6_3_ARM_PSCI_USE_HVC);
}
return EFI_SUCCESS;
}
/** CM_ARM_BOOT_ARCH_INFO parser function.
The following structure is populated:
typedef struct CmArmBootArchInfo {
UINT16 BootArchFlags; // {Populated}
} CM_ARM_BOOT_ARCH_INFO;
A parser parses a Device Tree to populate a specific CmObj type. None,
one or many CmObj can be created by the parser.
The created CmObj are then handed to the parser's caller through the
HW_INFO_ADD_OBJECT interface.
This can also be a dispatcher. I.e. a function that not parsing a
Device Tree but calling other parsers.
@param [in] FdtParserHandle A handle to the parser instance.
@param [in] FdtBranch When searching for DT node name, restrict
the search to this Device Tree branch.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_NOT_FOUND Not found.
@retval EFI_UNSUPPORTED Unsupported.
**/
EFI_STATUS
EFIAPI
ArmBootArchInfoParser (
IN CONST FDT_HW_INFO_PARSER_HANDLE FdtParserHandle,
IN INT32 FdtBranch
)
{
EFI_STATUS Status;
INT32 PsciNode;
CM_ARM_BOOT_ARCH_INFO BootArchInfo;
if (FdtParserHandle == NULL) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
ZeroMem (&BootArchInfo, sizeof (CM_ARM_BOOT_ARCH_INFO));
PsciNode = FdtBranch;
Status = FdtGetNextCompatNodeInBranch (
FdtParserHandle->Fdt,
FdtBranch,
&PsciCompatibleInfo,
&PsciNode
);
if (EFI_ERROR (Status)) {
// Error, or no node found.
ASSERT (Status == EFI_NOT_FOUND);
return Status;
}
// Parse the psci node.
Status = PsciNodeParser (FdtParserHandle->Fdt, PsciNode, &BootArchInfo);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
// Add the CmObj to the Configuration Manager.
Status = AddSingleCmObj (
FdtParserHandle,
CREATE_CM_ARM_OBJECT_ID (EArmObjBootArchInfo),
&BootArchInfo,
sizeof (CM_ARM_BOOT_ARCH_INFO),
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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