/** @file
Generic ARM implementation of DmaLib.h
Copyright (c) 2008 - 2010, Apple Inc. 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 <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/DmaLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UncachedMemoryAllocationLib.h>
#include <Library/IoLib.h>
#include <Library/BaseMemoryLib.h>
#include <Protocol/Cpu.h>
typedef struct {
EFI_PHYSICAL_ADDRESS HostAddress;
VOID *BufferAddress;
UINTN NumberOfBytes;
DMA_MAP_OPERATION Operation;
BOOLEAN DoubleBuffer;
} MAP_INFO_INSTANCE;
STATIC EFI_CPU_ARCH_PROTOCOL *mCpu;
STATIC
PHYSICAL_ADDRESS
HostToDeviceAddress (
IN PHYSICAL_ADDRESS HostAddress
)
{
return HostAddress + PcdGet64 (PcdArmDmaDeviceOffset);
}
/**
Provides the DMA controller-specific addresses needed to access system memory.
Operation is relative to the DMA bus master.
@param Operation Indicates if the bus master is going to read or write to system memory.
@param HostAddress The system memory address to map to the DMA controller.
@param NumberOfBytes On input the number of bytes to map. On output the number of bytes
that were mapped.
@param DeviceAddress The resulting map address for the bus master controller to use to
access the hosts HostAddress.
@param Mapping A resulting value to pass to Unmap().
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
**/
EFI_STATUS
EFIAPI
DmaMap (
IN DMA_MAP_OPERATION Operation,
IN VOID *HostAddress,
IN OUT UINTN *NumberOfBytes,
OUT PHYSICAL_ADDRESS *DeviceAddress,
OUT VOID **Mapping
)
{
EFI_STATUS Status;
MAP_INFO_INSTANCE *Map;
VOID *Buffer;
EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL || Mapping == NULL ) {
return EFI_INVALID_PARAMETER;
}
if (Operation >= MapOperationMaximum) {
return EFI_INVALID_PARAMETER;
}
//
// The debug implementation of UncachedMemoryAllocationLib in ArmPkg returns
// a virtual uncached alias, and unmaps the cached ID mapping of the buffer,
// in order to catch inadvertent references to the cached mapping.
// Since HostToDeviceAddress () expects ID mapped input addresses, convert
// the host address to an ID mapped address first.
//
*DeviceAddress = HostToDeviceAddress (ConvertToPhysicalAddress (HostAddress));
// Remember range so we can flush on the other side
Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));
if (Map == NULL) {
return EFI_OUT_OF_RESOURCES;
}
if ((((UINTN)HostAddress & (mCpu->DmaBufferAlignment - 1)) != 0) ||
((*NumberOfBytes & (mCpu->DmaBufferAlignment - 1)) != 0)) {
// Get the cacheability of the region
Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);
if (EFI_ERROR(Status)) {
goto FreeMapInfo;
}
// If the mapped buffer is not an uncached buffer
if ((GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) != 0) {
//
// Operations of type MapOperationBusMasterCommonBuffer are only allowed
// on uncached buffers.
//
if (Operation == MapOperationBusMasterCommonBuffer) {
DEBUG ((EFI_D_ERROR,
"%a: Operation type 'MapOperationBusMasterCommonBuffer' is only supported\n"
"on memory regions that were allocated using DmaAllocateBuffer ()\n",
__FUNCTION__));
Status = EFI_UNSUPPORTED;
goto FreeMapInfo;
}
//
// If the buffer does not fill entire cache lines we must double buffer into
// uncached memory. Device (PCI) address becomes uncached page.
//
Map->DoubleBuffer = TRUE;
Status = DmaAllocateBuffer (EfiBootServicesData, EFI_SIZE_TO_PAGES (*NumberOfBytes), &Buffer);
if (EFI_ERROR (Status)) {
goto FreeMapInfo;
}
if (Operation == MapOperationBusMasterRead) {
CopyMem (Buffer, HostAddress, *NumberOfBytes);
}
*DeviceAddress = HostToDeviceAddress (ConvertToPhysicalAddress (Buffer));
Map->BufferAddress = Buffer;
} else {
Map->DoubleBuffer = FALSE;
}
} else {
Map->DoubleBuffer = FALSE;
DEBUG_CODE_BEGIN ();
//
// The operation type check above only executes if the buffer happens to be
// misaligned with respect to CWG, but even if it is aligned, we should not
// allow arbitrary buffers to be used for creating consistent mappings.
// So duplicate the check here when running in DEBUG mode, just to assert
// that we are not trying to create a consistent mapping for cached memory.
//
Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);
ASSERT_EFI_ERROR(Status);
ASSERT (Operation != MapOperationBusMasterCommonBuffer ||
(GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) == 0);
DEBUG_CODE_END ();
// Flush the Data Cache (should not have any effect if the memory region is uncached)
mCpu->FlushDataCache (mCpu, (UINTN)HostAddress, *NumberOfBytes,
EfiCpuFlushTypeWriteBackInvalidate);
}
Map->HostAddress = (UINTN)HostAddress;
Map->NumberOfBytes = *NumberOfBytes;
Map->Operation = Operation;
*Mapping = Map;
return EFI_SUCCESS;
FreeMapInfo:
FreePool (Map);
return Status;
}
/**
Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()
operation and releases any corresponding resources.
@param Mapping The mapping value returned from DmaMap*().
@retval EFI_SUCCESS The range was unmapped.
@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
@retval EFI_INVALID_PARAMETER An inconsistency was detected between the mapping type
and the DoubleBuffer field
**/
EFI_STATUS
EFIAPI
DmaUnmap (
IN VOID *Mapping
)
{
MAP_INFO_INSTANCE *Map;
EFI_STATUS Status;
if (Mapping == NULL) {
ASSERT (FALSE);
return EFI_INVALID_PARAMETER;
}
Map = (MAP_INFO_INSTANCE *)Mapping;
Status = EFI_SUCCESS;
if (Map->DoubleBuffer) {
ASSERT (Map->Operation != MapOperationBusMasterCommonBuffer);
if (Map->Operation == MapOperationBusMasterCommonBuffer) {
Status = EFI_INVALID_PARAMETER;
} else if (Map->Operation == MapOperationBusMasterWrite) {
CopyMem ((VOID *)(UINTN)Map->HostAddress, Map->BufferAddress,
Map->NumberOfBytes);
}
DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map->NumberOfBytes), Map->BufferAddress);
} else {
if (Map->Operation == MapOperationBusMasterWrite) {
//
// Make sure we read buffer from uncached memory and not the cache
//
mCpu->FlushDataCache (mCpu, Map->HostAddress, Map->NumberOfBytes,
EfiCpuFlushTypeInvalidate);
}
}
FreePool (Map);
return Status;
}
/**
Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
mapping.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param HostAddress A pointer to store the base system memory address of the
allocated range.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE and MEMORY_CACHED.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
DmaAllocateBuffer (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress
)
{
VOID *Allocation;
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
//
// We used uncached memory to keep coherency
//
if (MemoryType == EfiBootServicesData) {
Allocation = UncachedAllocatePages (Pages);
} else if (MemoryType == EfiRuntimeServicesData) {
Allocation = UncachedAllocateRuntimePages (Pages);
} else {
return EFI_INVALID_PARAMETER;
}
if (Allocation == NULL) {
return EFI_OUT_OF_RESOURCES;
}
*HostAddress = Allocation;
return EFI_SUCCESS;
}
/**
Frees memory that was allocated with DmaAllocateBuffer().
@param Pages The number of pages to free.
@param HostAddress The base system memory address of the allocated range.
@retval EFI_SUCCESS The requested memory pages were freed.
@retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
was not allocated with DmaAllocateBuffer().
**/
EFI_STATUS
EFIAPI
DmaFreeBuffer (
IN UINTN Pages,
IN VOID *HostAddress
)
{
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
UncachedFreePages (HostAddress, Pages);
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
ArmDmaLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
// Get the Cpu protocol for later use
Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&mCpu);
ASSERT_EFI_ERROR(Status);
return Status;
}