ArmPkg/Library/ArmDmaLib/ArmDmaLib.c

   1 /** @file
   2   Generic ARM implementation of DmaLib.h
   3
   4   Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
   5
   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
  10
  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.
  13
  14 **/
  15
  16 #include <PiDxe.h>
  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>
  26
  27 #include <Protocol/Cpu.h>
  28
  29 typedef struct {
  30   EFI_PHYSICAL_ADDRESS      HostAddress;
  31   EFI_PHYSICAL_ADDRESS      DeviceAddress;
  32   UINTN                     NumberOfBytes;
  33   DMA_MAP_OPERATION         Operation;
  34   BOOLEAN                   DoubleBuffer;
  35 } MAP_INFO_INSTANCE;
  36
  37
  38
  39 EFI_CPU_ARCH_PROTOCOL      *gCpu;
  40 UINTN                      gCacheAlignment = 0;
  41
  42 /**
  43   Provides the DMA controller-specific addresses needed to access system memory.
  44
  45   Operation is relative to the DMA bus master.
  46
  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
  50                                 that were mapped.
  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().
  54
  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.
  60
  61 **/
  62 EFI_STATUS
  63 EFIAPI
  64 DmaMap (
  65   IN     DMA_MAP_OPERATION              Operation,
  66   IN     VOID                           *HostAddress,
  67   IN OUT UINTN                          *NumberOfBytes,
  68   OUT    PHYSICAL_ADDRESS               *DeviceAddress,
  69   OUT    VOID                           **Mapping
  70   )
  71 {
  72   EFI_STATUS                      Status;
  73   MAP_INFO_INSTANCE               *Map;
  74   VOID                            *Buffer;
  75   EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
  76
  77   if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL || Mapping == NULL ) {
  78     return EFI_INVALID_PARAMETER;
  79   }
  80
  81   if (Operation >= MapOperationMaximum) {
  82     return EFI_INVALID_PARAMETER;
  83   }
  84
  85   *DeviceAddress = ConvertToPhysicalAddress (HostAddress);
  86
  87   // Remember range so we can flush on the other side
  88   Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));
  89   if (Map == NULL) {
  90     return  EFI_OUT_OF_RESOURCES;
  91   }
  92
  93   *Mapping = Map;
  94
  95   if ((((UINTN)HostAddress & (gCacheAlignment - 1)) != 0) ||
  96       ((*NumberOfBytes % gCacheAlignment) != 0)) {
  97
  98     // Get the cacheability of the region
  99     Status = gDS->GetMemorySpaceDescriptor (*DeviceAddress, &GcdDescriptor);
 100     if (EFI_ERROR(Status)) {
 101       return Status;
 102     }
 103
 104     // If the mapped buffer is not an uncached buffer
 105     if (GcdDescriptor.Attributes != EFI_MEMORY_UC) {
 106       //
 107       // If the buffer does not fill entire cache lines we must double buffer into
 108       // uncached memory. Device (PCI) address becomes uncached page.
 109       //
 110       Map->DoubleBuffer  = TRUE;
 111       Status = DmaAllocateBuffer (EfiBootServicesData, EFI_SIZE_TO_PAGES (*NumberOfBytes), &Buffer);
 112       if (EFI_ERROR (Status)) {
 113         return Status;
 114       }
 115
 116       if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
 117         CopyMem (Buffer, HostAddress, *NumberOfBytes);
 118       }
 119
 120       *DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;
 121     } else {
 122       Map->DoubleBuffer  = FALSE;
 123     }
 124   } else {
 125     Map->DoubleBuffer  = FALSE;
 126
 127     // Flush the Data Cache (should not have any effect if the memory region is uncached)
 128     gCpu->FlushDataCache (gCpu, *DeviceAddress, *NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);
 129
 130     if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
 131       // In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached
 132       Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_UC);
 133       ASSERT_EFI_ERROR (Status);
 134     }
 135   }
 136
 137   Map->HostAddress   = (UINTN)HostAddress;
 138   Map->DeviceAddress = *DeviceAddress;
 139   Map->NumberOfBytes = *NumberOfBytes;
 140   Map->Operation     = Operation;
 141
 142   return EFI_SUCCESS;
 143 }
 144
 145
 146 /**
 147   Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()
 148   operation and releases any corresponding resources.
 149
 150   @param  Mapping               The mapping value returned from DmaMap*().
 151
 152   @retval EFI_SUCCESS           The range was unmapped.
 153   @retval EFI_DEVICE_ERROR      The data was not committed to the target system memory.
 154
 155 **/
 156 EFI_STATUS
 157 EFIAPI
 158 DmaUnmap (
 159   IN  VOID                         *Mapping
 160   )
 161 {
 162   MAP_INFO_INSTANCE *Map;
 163
 164   if (Mapping == NULL) {
 165     ASSERT (FALSE);
 166     return EFI_INVALID_PARAMETER;
 167   }
 168
 169   Map = (MAP_INFO_INSTANCE *)Mapping;
 170
 171   if (Map->DoubleBuffer) {
 172     if ((Map->Operation == MapOperationBusMasterWrite) || (Map->Operation == MapOperationBusMasterCommonBuffer)) {
 173       CopyMem ((VOID *)(UINTN)Map->HostAddress, (VOID *)(UINTN)Map->DeviceAddress, Map->NumberOfBytes);
 174     }
 175
 176     DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map->NumberOfBytes), (VOID *)(UINTN)Map->DeviceAddress);
 177
 178   } else {
 179     if (Map->Operation == MapOperationBusMasterWrite) {
 180       //
 181       // Make sure we read buffer from uncached memory and not the cache
 182       //
 183       gCpu->FlushDataCache (gCpu, Map->HostAddress, Map->NumberOfBytes, EfiCpuFlushTypeInvalidate);
 184     }
 185   }
 186
 187   FreePool (Map);
 188
 189   return EFI_SUCCESS;
 190 }
 191
 192 /**
 193   Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
 194   mapping.
 195
 196   @param  MemoryType            The type of memory to allocate, EfiBootServicesData or
 197                                 EfiRuntimeServicesData.
 198   @param  Pages                 The number of pages to allocate.
 199   @param  HostAddress           A pointer to store the base system memory address of the
 200                                 allocated range.
 201
 202                                 @retval EFI_SUCCESS           The requested memory pages were allocated.
 203   @retval EFI_UNSUPPORTED       Attributes is unsupported. The only legal attribute bits are
 204                                 MEMORY_WRITE_COMBINE and MEMORY_CACHED.
 205   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
 206   @retval EFI_OUT_OF_RESOURCES  The memory pages could not be allocated.
 207
 208 **/
 209 EFI_STATUS
 210 EFIAPI
 211 DmaAllocateBuffer (
 212   IN  EFI_MEMORY_TYPE              MemoryType,
 213   IN  UINTN                        Pages,
 214   OUT VOID                         **HostAddress
 215   )
 216 {
 217   if (HostAddress == NULL) {
 218     return EFI_INVALID_PARAMETER;
 219   }
 220
 221   //
 222   // The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
 223   //
 224   // We used uncached memory to keep coherency
 225   //
 226   if (MemoryType == EfiBootServicesData) {
 227     *HostAddress = UncachedAllocatePages (Pages);
 228   } else if (MemoryType == EfiRuntimeServicesData) {
 229     *HostAddress = UncachedAllocateRuntimePages (Pages);
 230   } else {
 231     return EFI_INVALID_PARAMETER;
 232   }
 233
 234   return EFI_SUCCESS;
 235 }
 236
 237
 238 /**
 239   Frees memory that was allocated with DmaAllocateBuffer().
 240
 241   @param  Pages                 The number of pages to free.
 242   @param  HostAddress           The base system memory address of the allocated range.
 243
 244   @retval EFI_SUCCESS           The requested memory pages were freed.
 245   @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
 246                                 was not allocated with DmaAllocateBuffer().
 247
 248 **/
 249 EFI_STATUS
 250 EFIAPI
 251 DmaFreeBuffer (
 252   IN  UINTN                        Pages,
 253   IN  VOID                         *HostAddress
 254   )
 255 {
 256   if (HostAddress == NULL) {
 257      return EFI_INVALID_PARAMETER;
 258   }
 259
 260   UncachedFreePages (HostAddress, Pages);
 261   return EFI_SUCCESS;
 262 }
 263
 264
 265 EFI_STATUS
 266 EFIAPI
 267 ArmDmaLibConstructor (
 268   IN EFI_HANDLE       ImageHandle,
 269   IN EFI_SYSTEM_TABLE *SystemTable
 270   )
 271 {
 272   EFI_STATUS              Status;
 273
 274   // Get the Cpu protocol for later use
 275   Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);
 276   ASSERT_EFI_ERROR(Status);
 277
 278   gCacheAlignment = ArmDataCacheLineLength ();
 279
 280   return Status;
 281 }
 282