lkml.org 
[lkml]   [2011]   [Jun]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 11/19] OpenRISC: Idle/Power management
Date

Minimal functionality...

Signed-off-by: Jonas Bonn <jonas@southpole.se>
---
arch/openrisc/kernel/idle.c | 81 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 81 insertions(+), 0 deletions(-)
create mode 100644 arch/openrisc/kernel/idle.c

diff --git a/arch/openrisc/kernel/idle.c b/arch/openrisc/kernel/idle.c
new file mode 100644
index 0000000..6909325
--- /dev/null
+++ b/arch/openrisc/kernel/idle.c
@@ -0,0 +1,81 @@
+/*
+ * OpenRISC idle.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Idle daemon for or32. Idle daemon will handle any action
+ * that needs to be taken when the system becomes idle.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/tick.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/cache.h>
+#include <asm/pgalloc.h>
+
+void (*powersave)(void) = NULL;
+
+static inline void pm_idle(void) {
+ barrier();
+}
+
+void cpu_idle(void)
+{
+ unsigned int cpu = smp_processor_id();
+
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
+ /* endless idle loop with no priority at all */
+ while (1) {
+ tick_nohz_stop_sched_tick(1);
+
+ while (!need_resched()) {
+ check_pgt_cache();
+ rmb();
+
+/* if (cpu_is_offline(cpu))
+ play_dead();
+*/
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+
+ local_irq_disable();
+ /* Don't trace irqs off for idle */
+ stop_critical_timings();
+ if (powersave != NULL )
+ powersave();
+ start_critical_timings();
+ local_irq_enable();
+ set_thread_flag(TIF_POLLING_NRFLAG);
+ }
+
+ tick_nohz_restart_sched_tick();
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+ }
+}
--
1.7.4.1


\
 
 \ /
  Last update: 2011-06-19 13:51    [from the cache]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site