| /* |
| * Copyright (c) 2015 Wind River Systems, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * @brief Initialize system clock driver |
| * |
| * Initializing the timer driver is done in this module to reduce code |
| * duplication. Although both nanokernel and microkernel systems initialize |
| * the timer driver at the same point, the two systems differ in when the system |
| * can begin to process system clock ticks. A nanokernel system can process |
| * system clock ticks once the driver has initialized. However, in a |
| * microkernel system all system clock ticks are deferred (and stored on the |
| * kernel server command stack) until the kernel server fiber starts and begins |
| * processing any queued ticks. |
| */ |
| |
| #include <nanokernel.h> |
| #include <init.h> |
| #include <drivers/system_timer.h> |
| |
| /* |
| * Currently only loapic timer implements device pm ops. |
| * For other timers, define device_pm_ops with default handers in case |
| * the app enables CONFIG_DEVICE_POWER_MANAGEMENT. |
| */ |
| #ifndef CONFIG_LOAPIC_TIMER |
| DEFINE_DEVICE_PM_OPS(_sys_clock, device_pm_nop, device_pm_nop); |
| #endif |
| SYS_INIT_PM("sys_clock", _sys_clock_driver_init, DEVICE_PM_OPS_GET(_sys_clock), |
| SECONDARY, CONFIG_SYSTEM_CLOCK_INIT_PRIORITY); |