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audk/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c

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/** @file
* Device tree enumeration DXE driver for ARM Virtual Machines
*
* Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
*
* 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 <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/VirtioMmioDeviceLib.h>
#include <Library/DevicePathLib.h>
#include <Library/PcdLib.h>
#include <Library/DxeServicesLib.h>
#include <libfdt.h>
#include <Guid/Fdt.h>
#pragma pack (1)
typedef struct {
VENDOR_DEVICE_PATH Vendor;
UINT64 PhysBase;
EFI_DEVICE_PATH_PROTOCOL End;
} VIRTIO_TRANSPORT_DEVICE_PATH;
#pragma pack ()
typedef enum {
PropertyTypeUnknown,
PropertyTypeGic,
PropertyTypeRtc,
PropertyTypeVirtio,
PropertyTypeUart,
PropertyTypeTimer,
PropertyTypePsci,
} PROPERTY_TYPE;
typedef struct {
PROPERTY_TYPE Type;
CHAR8 Compatible[20];
} PROPERTY;
STATIC CONST PROPERTY CompatibleProperties[] = {
{ PropertyTypeGic, "arm,cortex-a15-gic" },
{ PropertyTypeRtc, "arm,pl031" },
{ PropertyTypeVirtio, "virtio,mmio" },
{ PropertyTypeUart, "arm,pl011" },
{ PropertyTypeTimer, "arm,armv7-timer" },
{ PropertyTypeTimer, "arm,armv8-timer" },
{ PropertyTypePsci, "arm,psci-0.2" },
{ PropertyTypeUnknown, "" }
};
typedef struct {
UINT32 Type;
UINT32 Number;
UINT32 Flags;
} INTERRUPT_PROPERTY;
STATIC
PROPERTY_TYPE
GetTypeFromNode (
IN CONST CHAR8 *NodeType,
IN UINTN Size
)
{
CONST CHAR8 *Compatible;
CONST PROPERTY *CompatibleProperty;
//
// A 'compatible' node may contain a sequence of NULL terminated
// compatible strings so check each one
//
for (Compatible = NodeType; Compatible < NodeType + Size && *Compatible;
Compatible += 1 + AsciiStrLen (Compatible)) {
for (CompatibleProperty = CompatibleProperties; CompatibleProperty->Compatible[0]; CompatibleProperty++) {
if (AsciiStrCmp (CompatibleProperty->Compatible, Compatible) == 0) {
return CompatibleProperty->Type;
}
}
}
return PropertyTypeUnknown;
}
EFI_STATUS
EFIAPI
InitializeVirtFdtDxe (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
VOID *DeviceTreeBase;
INT32 Node, Prev;
INT32 RtcNode;
EFI_STATUS Status;
CONST CHAR8 *Type;
INT32 Len;
PROPERTY_TYPE PropType;
CONST VOID *RegProp;
VIRTIO_TRANSPORT_DEVICE_PATH *DevicePath;
EFI_HANDLE Handle;
UINT64 RegBase;
UINT64 DistBase, CpuBase;
CONST INTERRUPT_PROPERTY *InterruptProp;
INT32 SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum;
CONST CHAR8 *PsciMethod;
DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeBaseAddress);
ASSERT (DeviceTreeBase != NULL);
if (fdt_check_header (DeviceTreeBase) != 0) {
DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__, DeviceTreeBase));
return EFI_NOT_FOUND;
}
Status = gBS->InstallConfigurationTable (&gFdtTableGuid, DeviceTreeBase);
ASSERT_EFI_ERROR (Status);
DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, DeviceTreeBase));
RtcNode = -1;
//
// Now enumerate the nodes and install peripherals that we are interested in,
// i.e., GIC, RTC and virtio MMIO nodes
//
for (Prev = 0;; Prev = Node) {
Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
if (Node < 0) {
break;
}
Type = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len);
if (Type == NULL) {
continue;
}
PropType = GetTypeFromNode (Type, Len);
if (PropType == PropertyTypeUnknown) {
continue;
}
//
// Get the 'reg' property of this node. For now, we will assume
// 8 byte quantities for base and size, respectively.
// TODO use #cells root properties instead
//
RegProp = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);
ASSERT ((RegProp != NULL) || (PropType == PropertyTypeTimer) ||
(PropType == PropertyTypePsci));
switch (PropType) {
case PropertyTypeVirtio:
ASSERT (Len == 16);
//
// Create a unique device path for this transport on the fly
//
RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
DevicePath = (VIRTIO_TRANSPORT_DEVICE_PATH *)CreateDeviceNode (
HARDWARE_DEVICE_PATH,
HW_VENDOR_DP,
sizeof (VIRTIO_TRANSPORT_DEVICE_PATH));
if (DevicePath == NULL) {
DEBUG ((EFI_D_ERROR, "%a: Out of memory\n", __FUNCTION__));
break;
}
CopyMem (&DevicePath->Vendor.Guid, &gEfiCallerIdGuid, sizeof (EFI_GUID));
DevicePath->PhysBase = RegBase;
SetDevicePathNodeLength (&DevicePath->Vendor,
sizeof (*DevicePath) - sizeof (DevicePath->End));
SetDevicePathEndNode (&DevicePath->End);
Handle = NULL;
Status = gBS->InstallProtocolInterface (&Handle,
&gEfiDevicePathProtocolGuid, EFI_NATIVE_INTERFACE,
DevicePath);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "%a: Failed to install the EFI_DEVICE_PATH "
"protocol on a new handle (Status == %r)\n",
__FUNCTION__, Status));
FreePool (DevicePath);
break;
}
Status = VirtioMmioInstallDevice (RegBase, Handle);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "%a: Failed to install VirtIO transport @ 0x%Lx "
"on handle %p (Status == %r)\n", __FUNCTION__, RegBase,
Handle, Status));
Status = gBS->UninstallProtocolInterface (Handle,
&gEfiDevicePathProtocolGuid, DevicePath);
ASSERT_EFI_ERROR (Status);
FreePool (DevicePath);
}
break;
case PropertyTypeGic:
ASSERT (Len == 32);
DistBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
CpuBase = fdt64_to_cpu (((UINT64 *)RegProp)[2]);
ASSERT (DistBase < MAX_UINT32);
ASSERT (CpuBase < MAX_UINT32);
PcdSet32 (PcdGicDistributorBase, (UINT32)DistBase);
PcdSet32 (PcdGicInterruptInterfaceBase, (UINT32)CpuBase);
DEBUG ((EFI_D_INFO, "Found GIC @ 0x%Lx/0x%Lx\n", DistBase, CpuBase));
break;
case PropertyTypeRtc:
ASSERT (Len == 16);
RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
ASSERT (RegBase < MAX_UINT32);
PcdSet32 (PcdPL031RtcBase, (UINT32)RegBase);
DEBUG ((EFI_D_INFO, "Found PL031 RTC @ 0x%Lx\n", RegBase));
RtcNode = Node;
break;
case PropertyTypeTimer:
//
// - interrupts : Interrupt list for secure, non-secure, virtual and
// hypervisor timers, in that order.
//
InterruptProp = fdt_getprop (DeviceTreeBase, Node, "interrupts", &Len);
ASSERT (Len == 48);
SecIntrNum = fdt32_to_cpu (InterruptProp[0].Number)
+ (InterruptProp[0].Type ? 16 : 0);
IntrNum = fdt32_to_cpu (InterruptProp[1].Number)
+ (InterruptProp[1].Type ? 16 : 0);
VirtIntrNum = fdt32_to_cpu (InterruptProp[2].Number)
+ (InterruptProp[2].Type ? 16 : 0);
HypIntrNum = fdt32_to_cpu (InterruptProp[3].Number)
+ (InterruptProp[3].Type ? 16 : 0);
DEBUG ((EFI_D_INFO, "Found Timer interrupts %d, %d, %d, %d\n",
SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum));
PcdSet32 (PcdArmArchTimerSecIntrNum, SecIntrNum);
PcdSet32 (PcdArmArchTimerIntrNum, IntrNum);
PcdSet32 (PcdArmArchTimerVirtIntrNum, VirtIntrNum);
PcdSet32 (PcdArmArchTimerHypIntrNum, HypIntrNum);
break;
case PropertyTypePsci:
PsciMethod = fdt_getprop (DeviceTreeBase, Node, "method", &Len);
if (PsciMethod && AsciiStrnCmp (PsciMethod, "hvc", 3) == 0) {
PcdSet32 (PcdArmPsciMethod, 1);
} else if (PsciMethod && AsciiStrnCmp (PsciMethod, "smc", 3) == 0) {
PcdSet32 (PcdArmPsciMethod, 2);
} else {
DEBUG ((EFI_D_ERROR, "%a: Unknown PSCI method \"%a\"\n", __FUNCTION__,
PsciMethod));
}
break;
default:
break;
}
}
//
// UEFI takes ownership of the RTC hardware, and exposes its functionality
// through the UEFI Runtime Services GetTime, SetTime, etc. This means we
// need to disable it in the device tree to prevent the OS from attaching its
// device driver as well.
//
if ((RtcNode != -1) &&
fdt_setprop_string (DeviceTreeBase, RtcNode, "status",
"disabled") != 0) {
DEBUG ((EFI_D_WARN, "Failed to set PL031 status to 'disabled'\n"));
}
return EFI_SUCCESS;
}
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