2 Generic ARM implementation of DmaLib.h
4 Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
6 This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 #include <Library/DebugLib.h>
18 #include <Library/DmaLib.h>
19 #include <Library/DxeServicesTableLib.h>
20 #include <Library/MemoryAllocationLib.h>
21 #include <Library/UefiBootServicesTableLib.h>
22 #include <Library/UncachedMemoryAllocationLib.h>
23 #include <Library/IoLib.h>
24 #include <Library/BaseMemoryLib.h>
25 #include <Library/ArmLib.h>
27 #include <Protocol/Cpu.h>
30 EFI_PHYSICAL_ADDRESS HostAddress
;
31 EFI_PHYSICAL_ADDRESS DeviceAddress
;
33 DMA_MAP_OPERATION Operation
;
39 EFI_CPU_ARCH_PROTOCOL
*gCpu
;
40 UINTN gCacheAlignment
= 0;
43 Provides the DMA controller-specific addresses needed to access system memory.
45 Operation is relative to the DMA bus master.
47 @param Operation Indicates if the bus master is going to read or write to system memory.
48 @param HostAddress The system memory address to map to the DMA controller.
49 @param NumberOfBytes On input the number of bytes to map. On output the number of bytes
51 @param DeviceAddress The resulting map address for the bus master controller to use to
52 access the hosts HostAddress.
53 @param Mapping A resulting value to pass to Unmap().
55 @retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
56 @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
57 @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
58 @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
59 @retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
65 IN DMA_MAP_OPERATION Operation
,
67 IN OUT UINTN
*NumberOfBytes
,
68 OUT PHYSICAL_ADDRESS
*DeviceAddress
,
73 MAP_INFO_INSTANCE
*Map
;
75 EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor
;
77 if (HostAddress
== NULL
|| NumberOfBytes
== NULL
|| DeviceAddress
== NULL
|| Mapping
== NULL
) {
78 return EFI_INVALID_PARAMETER
;
81 if (Operation
>= MapOperationMaximum
) {
82 return EFI_INVALID_PARAMETER
;
85 *DeviceAddress
= ConvertToPhysicalAddress (HostAddress
);
87 // Remember range so we can flush on the other side
88 Map
= AllocatePool (sizeof (MAP_INFO_INSTANCE
));
90 return EFI_OUT_OF_RESOURCES
;
95 if ((((UINTN
)HostAddress
& (gCacheAlignment
- 1)) != 0) ||
96 ((*NumberOfBytes
& (gCacheAlignment
- 1)) != 0)) {
98 // Get the cacheability of the region
99 Status
= gDS
->GetMemorySpaceDescriptor (*DeviceAddress
, &GcdDescriptor
);
100 if (EFI_ERROR(Status
)) {
104 // If the mapped buffer is not an uncached buffer
105 if ((GcdDescriptor
.Attributes
& (EFI_MEMORY_WB
| EFI_MEMORY_WT
)) != 0) {
107 // Operations of type MapOperationBusMasterCommonBuffer are only allowed
108 // on uncached buffers.
110 if (Operation
== MapOperationBusMasterCommonBuffer
) {
112 "%a: Operation type 'MapOperationBusMasterCommonBuffer' is only supported\n"
113 "on memory regions that were allocated using DmaAllocateBuffer ()\n",
115 return EFI_UNSUPPORTED
;
119 // If the buffer does not fill entire cache lines we must double buffer into
120 // uncached memory. Device (PCI) address becomes uncached page.
122 Map
->DoubleBuffer
= TRUE
;
123 Status
= DmaAllocateBuffer (EfiBootServicesData
, EFI_SIZE_TO_PAGES (*NumberOfBytes
), &Buffer
);
124 if (EFI_ERROR (Status
)) {
128 if (Operation
== MapOperationBusMasterRead
) {
129 CopyMem (Buffer
, HostAddress
, *NumberOfBytes
);
132 *DeviceAddress
= (PHYSICAL_ADDRESS
)(UINTN
)Buffer
;
134 Map
->DoubleBuffer
= FALSE
;
137 Map
->DoubleBuffer
= FALSE
;
142 // The operation type check above only executes if the buffer happens to be
143 // misaligned with respect to CWG, but even if it is aligned, we should not
144 // allow arbitrary buffers to be used for creating consistent mappings.
145 // So duplicate the check here when running in DEBUG mode, just to assert
146 // that we are not trying to create a consistent mapping for cached memory.
148 Status
= gDS
->GetMemorySpaceDescriptor (*DeviceAddress
, &GcdDescriptor
);
149 ASSERT_EFI_ERROR(Status
);
151 ASSERT (Operation
!= MapOperationBusMasterCommonBuffer
||
152 (GcdDescriptor
.Attributes
& (EFI_MEMORY_WB
| EFI_MEMORY_WT
)) == 0);
156 // Flush the Data Cache (should not have any effect if the memory region is uncached)
157 gCpu
->FlushDataCache (gCpu
, *DeviceAddress
, *NumberOfBytes
, EfiCpuFlushTypeWriteBackInvalidate
);
160 Map
->HostAddress
= (UINTN
)HostAddress
;
161 Map
->DeviceAddress
= *DeviceAddress
;
162 Map
->NumberOfBytes
= *NumberOfBytes
;
163 Map
->Operation
= Operation
;
170 Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()
171 operation and releases any corresponding resources.
173 @param Mapping The mapping value returned from DmaMap*().
175 @retval EFI_SUCCESS The range was unmapped.
176 @retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
177 @retval EFI_INVALID_PARAMETER An inconsistency was detected between the mapping type
178 and the DoubleBuffer field
187 MAP_INFO_INSTANCE
*Map
;
190 if (Mapping
== NULL
) {
192 return EFI_INVALID_PARAMETER
;
195 Map
= (MAP_INFO_INSTANCE
*)Mapping
;
197 Status
= EFI_SUCCESS
;
198 if (Map
->DoubleBuffer
) {
199 ASSERT (Map
->Operation
!= MapOperationBusMasterCommonBuffer
);
201 if (Map
->Operation
== MapOperationBusMasterCommonBuffer
) {
202 Status
= EFI_INVALID_PARAMETER
;
203 } else if (Map
->Operation
== MapOperationBusMasterWrite
) {
204 CopyMem ((VOID
*)(UINTN
)Map
->HostAddress
, (VOID
*)(UINTN
)Map
->DeviceAddress
, Map
->NumberOfBytes
);
207 DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map
->NumberOfBytes
), (VOID
*)(UINTN
)Map
->DeviceAddress
);
210 if (Map
->Operation
== MapOperationBusMasterWrite
) {
212 // Make sure we read buffer from uncached memory and not the cache
214 gCpu
->FlushDataCache (gCpu
, Map
->HostAddress
, Map
->NumberOfBytes
, EfiCpuFlushTypeInvalidate
);
224 Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
227 @param MemoryType The type of memory to allocate, EfiBootServicesData or
228 EfiRuntimeServicesData.
229 @param Pages The number of pages to allocate.
230 @param HostAddress A pointer to store the base system memory address of the
233 @retval EFI_SUCCESS The requested memory pages were allocated.
234 @retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
235 MEMORY_WRITE_COMBINE and MEMORY_CACHED.
236 @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
237 @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
243 IN EFI_MEMORY_TYPE MemoryType
,
245 OUT VOID
**HostAddress
250 if (HostAddress
== NULL
) {
251 return EFI_INVALID_PARAMETER
;
255 // The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
257 // We used uncached memory to keep coherency
259 if (MemoryType
== EfiBootServicesData
) {
260 Allocation
= UncachedAllocatePages (Pages
);
261 } else if (MemoryType
== EfiRuntimeServicesData
) {
262 Allocation
= UncachedAllocateRuntimePages (Pages
);
264 return EFI_INVALID_PARAMETER
;
267 if (Allocation
== NULL
) {
268 return EFI_OUT_OF_RESOURCES
;
271 *HostAddress
= Allocation
;
278 Frees memory that was allocated with DmaAllocateBuffer().
280 @param Pages The number of pages to free.
281 @param HostAddress The base system memory address of the allocated range.
283 @retval EFI_SUCCESS The requested memory pages were freed.
284 @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
285 was not allocated with DmaAllocateBuffer().
295 if (HostAddress
== NULL
) {
296 return EFI_INVALID_PARAMETER
;
299 UncachedFreePages (HostAddress
, Pages
);
306 ArmDmaLibConstructor (
307 IN EFI_HANDLE ImageHandle
,
308 IN EFI_SYSTEM_TABLE
*SystemTable
313 // Get the Cpu protocol for later use
314 Status
= gBS
->LocateProtocol (&gEfiCpuArchProtocolGuid
, NULL
, (VOID
**)&gCpu
);
315 ASSERT_EFI_ERROR(Status
);
317 gCacheAlignment
= ArmCacheWritebackGranule ();