| /* |
| * Copyright (c) 2014 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 CPU power management |
| * |
| * CPU power management routines. |
| */ |
| |
| #define _ASMLANGUAGE |
| |
| #include <nano_private.h> |
| #include <offsets.h> |
| #include <toolchain.h> |
| #include <sections.h> |
| #include <arch/cpu.h> |
| |
| GTEXT(nano_cpu_idle) |
| GTEXT(nano_cpu_atomic_idle) |
| GDATA(nano_cpu_sleep_mode) |
| |
| #if defined(CONFIG_NANOKERNEL) && defined(CONFIG_TICKLESS_IDLE) |
| GTEXT(_power_save_idle) |
| #endif |
| |
| SECTION_VAR(BSS, nano_cpu_sleep_mode) |
| .word 0 |
| |
| #if defined(CONFIG_NANOKERNEL) && defined(CONFIG_TICKLESS_IDLE) |
| .macro enter_tickless_idle |
| /* interrupts are locked when entering here */ |
| push_s blink |
| jl _power_save_idle |
| pop_s blink |
| .endm |
| #else |
| #define enter_tickless_idle |
| #endif |
| |
| /* |
| * @brief Put the CPU in low-power mode |
| * |
| * This function always exits with interrupts unlocked. |
| * |
| * void nanCpuIdle(void) |
| */ |
| |
| SECTION_FUNC(TEXT, nano_cpu_idle) |
| |
| #ifdef CONFIG_KERNEL_EVENT_LOGGER_SLEEP |
| push_s blink |
| jl _sys_k_event_logger_enter_sleep |
| pop_s blink |
| #endif |
| enter_tickless_idle |
| |
| ld r1, [nano_cpu_sleep_mode] |
| or r1, r1, (1 << 4) /* set IRQ-enabled bit */ |
| sleep r1 |
| j_s [blink] |
| nop |
| |
| /* |
| * @brief Put the CPU in low-power mode, entered with IRQs locked |
| * |
| * This function exits with interrupts restored to <key>. |
| * |
| * void nano_cpu_atomic_idle(unsigned int key) |
| */ |
| SECTION_FUNC(TEXT, nano_cpu_atomic_idle) |
| |
| #ifdef CONFIG_KERNEL_EVENT_LOGGER_SLEEP |
| push_s blink |
| jl _sys_k_event_logger_enter_sleep |
| pop_s blink |
| #endif |
| |
| enter_tickless_idle |
| |
| ld r1, [nano_cpu_sleep_mode] |
| or r1, r1, (1 << 4) /* set IRQ-enabled bit */ |
| sleep r1 |
| j_s.d [blink] |
| seti r0 |