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/** @file
*
* Copyright (c) 2017, Linaro, Ltd. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which 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 <PiDxe.h>
#include <libfdt.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesLib.h>
#include <Library/MemoryAllocationLib.h>
// add enough space for two instances of 'status = "disabled"'
#define DTB_PADDING 64
STATIC
VOID
DisableDtNode (
IN VOID *Dtb,
IN CONST CHAR8 *NodePath
)
{
INT32 Node;
INT32 Rc;
Node = fdt_path_offset (Dtb, NodePath);
if (Node < 0) {
DEBUG ((DEBUG_ERROR, "%a: failed to locate DT path '%a': %a\n",
__FUNCTION__, NodePath, fdt_strerror (Node)));
return;
}
Rc = fdt_setprop_string (Dtb, Node, "status", "disabled");
if (Rc < 0) {
DEBUG ((DEBUG_ERROR, "%a: failed to set status to 'disabled' on '%a': %a\n",
__FUNCTION__, NodePath, fdt_strerror (Rc)));
}
}
/**
Return a pool allocated copy of the DTB image that is appropriate for
booting the current platform via DT.
@param[out] Dtb Pointer to the DTB copy
@param[out] DtbSize Size of the DTB copy
@retval EFI_SUCCESS Operation completed successfully
@retval EFI_NOT_FOUND No suitable DTB image could be located
@retval EFI_OUT_OF_RESOURCES No pool memory available
**/
EFI_STATUS
EFIAPI
DtPlatformLoadDtb (
OUT VOID **Dtb,
OUT UINTN *DtbSize
)
{
EFI_STATUS Status;
VOID *OrigDtb;
VOID *CopyDtb;
UINTN OrigDtbSize;
UINTN CopyDtbSize;
INT32 Rc;
Status = GetSectionFromAnyFv (&gDtPlatformDefaultDtbFileGuid,
EFI_SECTION_RAW, 0, &OrigDtb, &OrigDtbSize);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
CopyDtbSize = OrigDtbSize + DTB_PADDING;
CopyDtb = AllocatePool (CopyDtbSize);
if (CopyDtb == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Rc = fdt_open_into (OrigDtb, CopyDtb, CopyDtbSize);
if (Rc < 0) {
DEBUG ((DEBUG_ERROR, "%a: fdt_open_into () failed: %a\n", __FUNCTION__,
fdt_strerror (Rc)));
return EFI_NOT_FOUND;
}
if (!(PcdGet8 (PcdPcieEnableMask) & BIT0)) {
DisableDtNode (CopyDtb, "/pcie@60000000");
}
if (!(PcdGet8 (PcdPcieEnableMask) & BIT1)) {
DisableDtNode (CopyDtb, "/pcie@70000000");
}
*Dtb = CopyDtb;
*DtbSize = CopyDtbSize;
return EFI_SUCCESS;
}
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