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      1 /** @file
      2 
      3   Copyright (c) 2014, ARM Ltd. All rights reserved.
      4 
      5   This program and the accompanying materials are licensed and made available
      6   under the terms and conditions of the BSD License which accompanies this
      7   distribution.  The full text of the license may be found at
      8   http://opensource.org/licenses/bsd-license.php
      9 
     10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
     11   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     12 
     13 **/
     14 
     15 #include "ArmVExpressInternal.h"
     16 #include <Library/ArmPlatformLib.h>  // To get Core Count
     17 
     18 //
     19 // Description of the four ARM model platforms :
     20 // Platform ids are defined in ArmVExpressInternal.h for
     21 // all "ArmVExpress-like" platforms (AARCH64 or ARM architecture,
     22 // model or hardware platforms).
     23 //
     24 CONST ARM_VEXPRESS_PLATFORM ArmVExpressPlatforms[] = {
     25   { ARM_FVP_VEXPRESS_A9x4,  FixedPcdGetPtr (PcdFdtVExpressFvpA9x4),  L"rtsm_ve-cortex_a9x4.dtb"  },
     26   { ARM_FVP_VEXPRESS_A15x1, FixedPcdGetPtr (PcdFdtVExpressFvpA15x1), L"rtsm_ve-cortex_a15x1.dtb" },
     27   { ARM_FVP_VEXPRESS_A15x2, FixedPcdGetPtr (PcdFdtVExpressFvpA15x2), L"rtsm_ve-cortex_a15x2.dtb" },
     28   { ARM_FVP_VEXPRESS_A15x4, FixedPcdGetPtr (PcdFdtVExpressFvpA15x4), L"rtsm_ve-cortex_a15x4.dtb" },
     29   { ARM_FVP_VEXPRESS_UNKNOWN, }
     30 };
     31 
     32 /**
     33   Get information about the VExpress platform the firmware is running on.
     34 
     35   @param[out]  Platform   Address where the pointer to the platform information
     36                           (type ARM_VEXPRESS_PLATFORM*) should be stored.
     37                           The returned pointer does not point to an allocated
     38                           memory area.
     39 
     40   @retval  EFI_SUCCESS    The platform information was returned.
     41   @retval  EFI_NOT_FOUND  The platform was not recognised.
     42 
     43 **/
     44 EFI_STATUS
     45 ArmVExpressGetPlatform (
     46   OUT CONST ARM_VEXPRESS_PLATFORM** Platform
     47   )
     48 {
     49   UINT32                SysId;
     50   UINTN                 CpuType;
     51   EFI_STATUS            Status;
     52   UINTN                 CoreCount;
     53 
     54   ASSERT (Platform != NULL);
     55 
     56   CpuType   = 0;
     57   Status    = EFI_NOT_FOUND;
     58   *Platform = NULL;
     59 
     60   SysId = MmioRead32 (ARM_VE_SYS_ID_REG);
     61   if (SysId == ARM_RTSM_SYS_ID) {
     62     // Get the Cortex-A version
     63     CpuType = (ArmReadMidr () >> 4) & ARM_CPU_TYPE_MASK;
     64     if (CpuType == ARM_CPU_TYPE_A9) {
     65       Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_A9x4, Platform);
     66     } else if (CpuType == ARM_CPU_TYPE_A15) {
     67       CoreCount = ArmGetCpuCountPerCluster ();
     68       if (CoreCount == 1) {
     69         Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_A15x1, Platform);
     70       } else if (CoreCount == 2) {
     71         Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_A15x2, Platform);
     72       } else if (CoreCount == 4) {
     73         Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_A15x4, Platform);
     74       }
     75     }
     76   }
     77 
     78   if (EFI_ERROR (Status)) {
     79     DEBUG ((EFI_D_ERROR, "Unsupported platform (SysId:0x%X, CpuType:0x%X)\n", SysId, CpuType));
     80     ASSERT_EFI_ERROR (Status);
     81   }
     82 
     83   return Status;
     84 }
     85