1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "chre/platform/slpi/system_time_util.h"
18 
19 #include "chre/util/time.h"
20 
21 namespace chre {
22 
getNanosecondsFromQTimerTicks(uint64_t ticks)23 uint64_t getNanosecondsFromQTimerTicks(uint64_t ticks) {
24   constexpr uint64_t kClockFreq = 19200000;  // 19.2MHz QTimer clock
25 
26   uint64_t nsec = 0;
27   if (ticks >= kClockFreq) {
28     uint64_t seconds = (ticks / kClockFreq);
29     ticks %= kClockFreq;
30 
31     nsec = (seconds * kOneSecondInNanoseconds);
32   }
33   nsec += (ticks * kOneSecondInNanoseconds) / kClockFreq;
34   return nsec;
35 }
36 
37 }  // namespace chre
38