1 files changed, 100 insertions, 0 deletions

diff --git a/arch/ppc/kernel/idle.c b/arch/ppc/kernel/idle.c
new file mode 100644
index 000000000000..53547b6de45b
--- /dev/null
+++ b/arch/ppc/kernel/idle.c
@@ -0,0 +1,100 @@
+/*
+ * Idle daemon for PowerPC.  Idle daemon will handle any action
+ * that needs to be taken when the system becomes idle.
+ *
+ * Written by Cort Dougan (cort@cs.nmt.edu).  Subsequently hacked
+ * on by Tom Rini, Armin Kuster, Paul Mackerras and others.
+ *
+ * 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.
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/mmu.h>
+#include <asm/cache.h>
+#include <asm/cputable.h>
+#include <asm/machdep.h>
+
+void default_idle(void)
+{
+        void (*powersave)(void);
+
+        powersave = ppc_md.power_save;
+
+        if (!need_resched()) {
+                if (powersave != NULL)
+                        powersave();
+#ifdef CONFIG_SMP
+                else {
+                        set_thread_flag(TIF_POLLING_NRFLAG);
+                        while (!need_resched())
+                                barrier();
+                        clear_thread_flag(TIF_POLLING_NRFLAG);
+                }
+#endif
+        }
+        if (need_resched())
+                schedule();
+}
+
+/*
+ * The body of the idle task.
+ */
+void cpu_idle(void)
+{
+        for (;;)
+                if (ppc_md.idle != NULL)
+                        ppc_md.idle();
+                else
+                        default_idle();
+}
+
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_6xx)
+/*
+ * Register the sysctl to set/clear powersave_nap.
+ */
+extern unsigned long powersave_nap;
+
+static ctl_table powersave_nap_ctl_table[]={
+        {
+                .ctl_name       = KERN_PPC_POWERSAVE_NAP,
+                .procname       = "powersave-nap",
+                .data           = &powersave_nap,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        { 0, },
+};
+static ctl_table powersave_nap_sysctl_root[] = {
+        { 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
+        { 0,},
+};
+
+static int __init
+register_powersave_nap_sysctl(void)
+{
+        register_sysctl_table(powersave_nap_sysctl_root, 0);
+
+        return 0;
+}
+
+__initcall(register_powersave_nap_sysctl);
+#endif