OpenRISC: Idle/Power management
Minimal functionality...
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/openrisc/kernel/idle.c b/arch/openrisc/kernel/idle.c
new file mode 100644
index 0000000..d5bc5f8
--- /dev/null
+++ b/arch/openrisc/kernel/idle.c
@@ -0,0 +1,77 @@
+/*
+ * 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)
+{
+ 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();
+
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+
+ local_irq_disable();
+ /* Don't trace irqs off for idle */
+ stop_critical_timings();
+ if (!need_resched() && 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();
+ }
+}