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      1 /** @file
      2 *
      3 *  Copyright (c) 2015, Hisilicon Limited. All rights reserved.
      4 *  Copyright (c) 2015, Linaro Limited. All rights reserved.
      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 
     17 #include <PiDxe.h>
     18 #include <Library/DebugLib.h>
     19 #include <Library/UefiBootServicesTableLib.h>
     20 #include <Library/BaseLib.h>
     21 #include <Library/UefiRuntimeLib.h>
     22 #include <Library/DxeServicesTableLib.h>
     23 #include <Guid/EventGroup.h>
     24 
     25 #include <Library/PlatformSysCtrlLib.h>
     26 #include "I2CLibInternal.h"
     27 
     28 STATIC EFI_EVENT              mI2cLibVirtualAddrChangeEvent;
     29 
     30 STATIC UINTN gI2cBase[MAX_SOCKET][I2C_PORT_MAX];
     31 
     32 UINTN GetI2cBase (UINT32 Socket, UINT8 Port)
     33 {
     34   if (gI2cBase[Socket][Port] == 0) {
     35     gI2cBase[Socket][Port] = PlatformGetI2cBase(Socket, Port);
     36   }
     37 
     38   return gI2cBase[Socket][Port];
     39 }
     40 
     41 VOID
     42 EFIAPI
     43 I2cLibVirtualNotifyEvent (
     44   IN EFI_EVENT        Event,
     45   IN VOID             *Context
     46   )
     47 {
     48   UINT32 Socket;
     49   UINT8  Port;
     50 
     51   // We assume that all I2C ports used in one runtime driver need to be
     52   // converted into virtual address.
     53   for (Socket = 0; Socket < MAX_SOCKET; Socket++) {
     54     for (Port = 0; Port < I2C_PORT_MAX; Port++) {
     55       if (gI2cBase[Socket][Port] != 0) {
     56         EfiConvertPointer (0x0, (VOID **)&gI2cBase[Socket][Port]);
     57       }
     58     }
     59   }
     60 
     61   return;
     62 }
     63 
     64 EFI_STATUS
     65 I2cLibRuntimeSetup (UINT32 Socket, UINT8 Port)
     66 {
     67   EFI_STATUS Status;
     68 
     69   UINTN Base = GetI2cBase (Socket, Port);
     70 
     71   // Declare the controller as EFI_MEMORY_RUNTIME
     72   Status = gDS->AddMemorySpace (
     73       EfiGcdMemoryTypeMemoryMappedIo,
     74       Base, SIZE_64KB,
     75       EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
     76       );
     77   if (EFI_ERROR (Status)) {
     78     DEBUG ((EFI_D_WARN, "[%a:%d] AddMemorySpace failed: %r\n", __FUNCTION__, __LINE__, Status));
     79   }
     80 
     81   Status = gDS->SetMemorySpaceAttributes (Base, SIZE_64KB, EFI_MEMORY_UC | EFI_MEMORY_RUNTIME);
     82   if (EFI_ERROR (Status)) {
     83     DEBUG ((EFI_D_ERROR, "[%a:%d] SetMemorySpaceAttributes failed: %r\n", __FUNCTION__, __LINE__, Status));
     84     return Status;
     85   }
     86 
     87   //
     88   // Register for the virtual address change event
     89   //
     90   // Only create event once
     91   if (mI2cLibVirtualAddrChangeEvent == NULL) {
     92     Status = gBS->CreateEventEx (
     93         EVT_NOTIFY_SIGNAL,
     94         TPL_NOTIFY,
     95         I2cLibVirtualNotifyEvent,
     96         NULL,
     97         &gEfiEventVirtualAddressChangeGuid,
     98         &mI2cLibVirtualAddrChangeEvent
     99     );
    100     if (EFI_ERROR (Status)) {
    101       DEBUG ((EFI_D_ERROR, "[%a:%d] Create event failed: %r\n", __FUNCTION__, __LINE__, Status));
    102       return Status;
    103     }
    104   }
    105 
    106   return EFI_SUCCESS;
    107 }
    108 
    109 
    110