Jonas Bonn | 2a7be11 | 2011-06-04 22:28:42 +0300 | [diff] [blame] | 1 | /* |
| 2 | * OpenRISC idle.c |
| 3 | * |
| 4 | * Linux architectural port borrowing liberally from similar works of |
| 5 | * others. All original copyrights apply as per the original source |
| 6 | * declaration. |
| 7 | * |
| 8 | * Modifications for the OpenRISC architecture: |
| 9 | * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
| 10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * Idle daemon for or32. Idle daemon will handle any action |
| 18 | * that needs to be taken when the system becomes idle. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/smp.h> |
| 26 | #include <linux/stddef.h> |
| 27 | #include <linux/unistd.h> |
| 28 | #include <linux/ptrace.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/tick.h> |
| 31 | |
| 32 | #include <asm/pgtable.h> |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <asm/system.h> |
| 35 | #include <asm/io.h> |
| 36 | #include <asm/processor.h> |
| 37 | #include <asm/mmu.h> |
| 38 | #include <asm/cache.h> |
| 39 | #include <asm/pgalloc.h> |
| 40 | |
| 41 | void (*powersave) (void) = NULL; |
| 42 | |
| 43 | static inline void pm_idle(void) |
| 44 | { |
| 45 | barrier(); |
| 46 | } |
| 47 | |
| 48 | void cpu_idle(void) |
| 49 | { |
| 50 | set_thread_flag(TIF_POLLING_NRFLAG); |
| 51 | |
| 52 | /* endless idle loop with no priority at all */ |
| 53 | while (1) { |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame^] | 54 | tick_nohz_idle_enter(); |
Jonas Bonn | 2a7be11 | 2011-06-04 22:28:42 +0300 | [diff] [blame] | 55 | |
| 56 | while (!need_resched()) { |
| 57 | check_pgt_cache(); |
| 58 | rmb(); |
| 59 | |
| 60 | clear_thread_flag(TIF_POLLING_NRFLAG); |
| 61 | |
| 62 | local_irq_disable(); |
| 63 | /* Don't trace irqs off for idle */ |
| 64 | stop_critical_timings(); |
| 65 | if (!need_resched() && powersave != NULL) |
| 66 | powersave(); |
| 67 | start_critical_timings(); |
| 68 | local_irq_enable(); |
| 69 | set_thread_flag(TIF_POLLING_NRFLAG); |
| 70 | } |
| 71 | |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame^] | 72 | tick_nohz_idle_exit(); |
Jonas Bonn | 2a7be11 | 2011-06-04 22:28:42 +0300 | [diff] [blame] | 73 | preempt_enable_no_resched(); |
| 74 | schedule(); |
| 75 | preempt_disable(); |
| 76 | } |
| 77 | } |