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_WC) &&
 106          (GcdDescriptor.Attributes != EFI_MEMORY_UC) )
 107     {
 108       //
 109       // If the buffer does not fill entire cache lines we must double buffer into
 110       // uncached memory. Device (PCI) address becomes uncached page.
 111       //
 112       Map->DoubleBuffer  = TRUE;
 113       Status = DmaAllocateBuffer (EfiBootServicesData, EFI_SIZE_TO_PAGES (*NumberOfBytes), &Buffer);
 114       if (EFI_ERROR (Status)) {
 115         return Status;
 116       }
 117
 118       if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
 119         CopyMem (Buffer, HostAddress, *NumberOfBytes);
 120       }
 121
 122       *DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;
 123     } else {
 124       Map->DoubleBuffer  = FALSE;
 125     }
 126   } else {
 127     Map->DoubleBuffer  = FALSE;
 128
 129     // Flush the Data Cache (should not have any effect if the memory region is uncached)
 130     gCpu->FlushDataCache (gCpu, *DeviceAddress, *NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);
 131
 132     if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
 133       // In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached
 134       Status = gDS->SetMemorySpaceAttributes (*DeviceAddress & ~(BASE_4KB - 1), ALIGN_VALUE (*NumberOfBytes, BASE_4KB), EFI_MEMORY_WC);
 135       ASSERT_EFI_ERROR (Status);
 136     }
 137   }
 138
 139   Map->HostAddress   = (UINTN)HostAddress;
 140   Map->DeviceAddress = *DeviceAddress;
 141   Map->NumberOfBytes = *NumberOfBytes;
 142   Map->Operation     = Operation;
 143
 144   return EFI_SUCCESS;
 145 }
 146
 147
 148 /**
 149   Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()
 150   operation and releases any corresponding resources.
 151
 152   @param  Mapping               The mapping value returned from DmaMap*().
 153
 154   @retval EFI_SUCCESS           The range was unmapped.
 155   @retval EFI_DEVICE_ERROR      The data was not committed to the target system memory.
 156
 157 **/
 158 EFI_STATUS
 159 EFIAPI
 160 DmaUnmap (
 161   IN  VOID                         *Mapping
 162   )
 163 {
 164   MAP_INFO_INSTANCE *Map;
 165
 166   if (Mapping == NULL) {
 167     ASSERT (FALSE);
 168     return EFI_INVALID_PARAMETER;
 169   }
 170
 171   Map = (MAP_INFO_INSTANCE *)Mapping;
 172
 173   if (Map->DoubleBuffer) {
 174     if ((Map->Operation == MapOperationBusMasterWrite) || (Map->Operation == MapOperationBusMasterCommonBuffer)) {
 175       CopyMem ((VOID *)(UINTN)Map->HostAddress, (VOID *)(UINTN)Map->DeviceAddress, Map->NumberOfBytes);
 176     }
 177
 178     DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map->NumberOfBytes), (VOID *)(UINTN)Map->DeviceAddress);
 179
 180   } else {
 181     if (Map->Operation == MapOperationBusMasterWrite) {
 182       //
 183       // Make sure we read buffer from uncached memory and not the cache
 184       //
 185       gCpu->FlushDataCache (gCpu, Map->HostAddress, Map->NumberOfBytes, EfiCpuFlushTypeInvalidate);
 186     }
 187   }
 188
 189   FreePool (Map);
 190
 191   return EFI_SUCCESS;
 192 }
 193
 194 /**
 195   Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
 196   mapping.
 197
 198   @param  MemoryType            The type of memory to allocate, EfiBootServicesData or
 199                                 EfiRuntimeServicesData.
 200   @param  Pages                 The number of pages to allocate.
 201   @param  HostAddress           A pointer to store the base system memory address of the
 202                                 allocated range.
 203
 204                                 @retval EFI_SUCCESS           The requested memory pages were allocated.
 205   @retval EFI_UNSUPPORTED       Attributes is unsupported. The only legal attribute bits are
 206                                 MEMORY_WRITE_COMBINE and MEMORY_CACHED.
 207   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
 208   @retval EFI_OUT_OF_RESOURCES  The memory pages could not be allocated.
 209
 210 **/
 211 EFI_STATUS
 212 EFIAPI
 213 DmaAllocateBuffer (
 214   IN  EFI_MEMORY_TYPE              MemoryType,
 215   IN  UINTN                        Pages,
 216   OUT VOID                         **HostAddress
 217   )
 218 {
 219   if (HostAddress == NULL) {
 220     return EFI_INVALID_PARAMETER;
 221   }
 222
 223   //
 224   // The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
 225   //
 226   // We used uncached memory to keep coherency
 227   //
 228   if (MemoryType == EfiBootServicesData) {
 229     *HostAddress = UncachedAllocatePages (Pages);
 230   } else if (MemoryType == EfiRuntimeServicesData) {
 231     *HostAddress = UncachedAllocateRuntimePages (Pages);
 232   } else {
 233     return EFI_INVALID_PARAMETER;
 234   }
 235
 236   return EFI_SUCCESS;
 237 }
 238
 239
 240 /**
 241   Frees memory that was allocated with DmaAllocateBuffer().
 242
 243   @param  Pages                 The number of pages to free.
 244   @param  HostAddress           The base system memory address of the allocated range.
 245
 246   @retval EFI_SUCCESS           The requested memory pages were freed.
 247   @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
 248                                 was not allocated with DmaAllocateBuffer().
 249
 250 **/
 251 EFI_STATUS
 252 EFIAPI
 253 DmaFreeBuffer (
 254   IN  UINTN                        Pages,
 255   IN  VOID                         *HostAddress
 256   )
 257 {
 258   if (HostAddress == NULL) {
 259      return EFI_INVALID_PARAMETER;
 260   }
 261
 262   UncachedFreePages (HostAddress, Pages);
 263   return EFI_SUCCESS;
 264 }
 265
 266
 267 EFI_STATUS
 268 EFIAPI
 269 ArmDmaLibConstructor (
 270   IN EFI_HANDLE       ImageHandle,
 271   IN EFI_SYSTEM_TABLE *SystemTable
 272   )
 273 {
 274   EFI_STATUS              Status;
 275
 276   // Get the Cpu protocol for later use
 277   Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);
 278   ASSERT_EFI_ERROR(Status);
 279
 280   gCacheAlignment = ArmDataCacheLineLength ();
 281
 282   return Status;
 283 }
 284