1 /** @file 2 3 Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR> 4 Copyright (c) 2014, Linaro Ltd. 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 <Library/ArmGenericTimerCounterLib.h> 17 #include <Library/ArmArchTimer.h> 18 19 VOID 20 EFIAPI 21 ArmGenericTimerEnableTimer ( 22 VOID 23 ) 24 { 25 UINTN TimerCtrlReg; 26 27 ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg); 28 TimerCtrlReg |= ARM_ARCH_TIMER_ENABLE; 29 30 // 31 // When running under KVM, we need to unmask the interrupt on the timer side 32 // as KVM will mask it when servicing the interrupt at the hypervisor level 33 // and delivering the virtual timer interrupt to the guest. Otherwise, the 34 // interrupt will fire again, trapping into the hypervisor again, etc. etc. 35 // This is scheduled to be fixed on the KVM side, but there is no harm in 36 // leaving this in once KVM gets fixed. 37 // 38 TimerCtrlReg &= ~ARM_ARCH_TIMER_IMASK; 39 ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg); 40 } 41 42 VOID 43 EFIAPI 44 ArmGenericTimerDisableTimer ( 45 VOID 46 ) 47 { 48 UINTN TimerCtrlReg; 49 50 ArmArchTimerReadReg (CntvCtl, (VOID *)&TimerCtrlReg); 51 TimerCtrlReg &= ~ARM_ARCH_TIMER_ENABLE; 52 ArmArchTimerWriteReg (CntvCtl, (VOID *)&TimerCtrlReg); 53 } 54 55 VOID 56 EFIAPI 57 ArmGenericTimerSetTimerFreq ( 58 IN UINTN FreqInHz 59 ) 60 { 61 ArmArchTimerWriteReg (CntFrq, (VOID *)&FreqInHz); 62 } 63 64 UINTN 65 EFIAPI 66 ArmGenericTimerGetTimerFreq ( 67 VOID 68 ) 69 { 70 UINTN ArchTimerFreq = 0; 71 ArmArchTimerReadReg (CntFrq, (VOID *)&ArchTimerFreq); 72 return ArchTimerFreq; 73 } 74 75 UINTN 76 EFIAPI 77 ArmGenericTimerGetTimerVal ( 78 VOID 79 ) 80 { 81 UINTN ArchTimerValue; 82 ArmArchTimerReadReg (CntvTval, (VOID *)&ArchTimerValue); 83 84 return ArchTimerValue; 85 } 86 87 88 VOID 89 EFIAPI 90 ArmGenericTimerSetTimerVal ( 91 IN UINTN Value 92 ) 93 { 94 ArmArchTimerWriteReg (CntvTval, (VOID *)&Value); 95 } 96 97 UINT64 98 EFIAPI 99 ArmGenericTimerGetSystemCount ( 100 VOID 101 ) 102 { 103 UINT64 SystemCount; 104 ArmArchTimerReadReg (CntvCt, (VOID *)&SystemCount); 105 106 return SystemCount; 107 } 108 109 UINTN 110 EFIAPI 111 ArmGenericTimerGetTimerCtrlReg ( 112 VOID 113 ) 114 { 115 UINTN Value; 116 ArmArchTimerReadReg (CntvCtl, (VOID *)&Value); 117 118 return Value; 119 } 120 121 VOID 122 EFIAPI 123 ArmGenericTimerSetTimerCtrlReg ( 124 UINTN Value 125 ) 126 { 127 ArmArchTimerWriteReg (CntvCtl, (VOID *)&Value); 128 } 129 130 UINT64 131 EFIAPI 132 ArmGenericTimerGetCompareVal ( 133 VOID 134 ) 135 { 136 UINT64 Value; 137 ArmArchTimerReadReg (CntvCval, (VOID *)&Value); 138 139 return Value; 140 } 141 142 VOID 143 EFIAPI 144 ArmGenericTimerSetCompareVal ( 145 IN UINT64 Value 146 ) 147 { 148 ArmArchTimerWriteReg (CntvCval, (VOID *)&Value); 149 } 150
