Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Idle daemon for PowerPC. Idle daemon will handle any action | |
3 | * that needs to be taken when the system becomes idle. | |
4 | * | |
a0652fc9 PM |
5 | * Originally written by Cort Dougan (cort@cs.nmt.edu). |
6 | * Subsequent 32-bit hacking by Tom Rini, Armin Kuster, | |
7 | * Paul Mackerras and others. | |
1da177e4 LT |
8 | * |
9 | * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com> | |
10 | * | |
11 | * Additional shared processor, SMT, and firmware support | |
12 | * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com> | |
13 | * | |
a0652fc9 PM |
14 | * 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org> |
15 | * | |
1da177e4 LT |
16 | * This program is free software; you can redistribute it and/or |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/sched.h> |
23 | #include <linux/kernel.h> | |
24 | #include <linux/smp.h> | |
25 | #include <linux/cpu.h> | |
1da177e4 | 26 | #include <linux/sysctl.h> |
1ad74998 | 27 | #include <linux/tick.h> |
1da177e4 | 28 | |
1da177e4 | 29 | #include <asm/processor.h> |
1da177e4 LT |
30 | #include <asm/cputable.h> |
31 | #include <asm/time.h> | |
fd899c0c | 32 | #include <asm/machdep.h> |
ae3a197e | 33 | #include <asm/runlatch.h> |
2249ca9d | 34 | #include <asm/smp.h> |
1da177e4 | 35 | |
1da177e4 | 36 | |
771dae81 DD |
37 | unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; |
38 | EXPORT_SYMBOL(cpuidle_disable); | |
39 | ||
302eca18 | 40 | static int __init powersave_off(char *arg) |
41 | { | |
42 | ppc_md.power_save = NULL; | |
771dae81 | 43 | cpuidle_disable = IDLE_POWERSAVE_OFF; |
302eca18 | 44 | return 0; |
45 | } | |
46 | __setup("powersave=off", powersave_off); | |
47 | ||
799fef06 TG |
48 | #ifdef CONFIG_HOTPLUG_CPU |
49 | void arch_cpu_idle_dead(void) | |
1da177e4 | 50 | { |
799fef06 TG |
51 | sched_preempt_enable_no_resched(); |
52 | cpu_die(); | |
53 | } | |
54 | #endif | |
1da177e4 | 55 | |
799fef06 TG |
56 | void arch_cpu_idle(void) |
57 | { | |
58 | ppc64_runlatch_off(); | |
59 | ||
60 | if (ppc_md.power_save) { | |
61 | ppc_md.power_save(); | |
62 | /* | |
63 | * Some power_save functions return with | |
64 | * interrupts enabled, some don't. | |
65 | */ | |
66 | if (irqs_disabled()) | |
67 | local_irq_enable(); | |
68 | } else { | |
69 | local_irq_enable(); | |
70 | /* | |
71 | * Go into low thread priority and possibly | |
72 | * low power mode. | |
73 | */ | |
74 | HMT_low(); | |
75 | HMT_very_low(); | |
1da177e4 | 76 | } |
799fef06 TG |
77 | |
78 | HMT_medium(); | |
79 | ppc64_runlatch_on(); | |
1da177e4 LT |
80 | } |
81 | ||
1da177e4 LT |
82 | int powersave_nap; |
83 | ||
84 | #ifdef CONFIG_SYSCTL | |
85 | /* | |
86 | * Register the sysctl to set/clear powersave_nap. | |
87 | */ | |
cc293bf7 | 88 | static struct ctl_table powersave_nap_ctl_table[] = { |
1da177e4 | 89 | { |
1da177e4 LT |
90 | .procname = "powersave-nap", |
91 | .data = &powersave_nap, | |
92 | .maxlen = sizeof(int), | |
93 | .mode = 0644, | |
6d456111 | 94 | .proc_handler = proc_dointvec, |
1da177e4 | 95 | }, |
f5f10678 | 96 | {} |
1da177e4 | 97 | }; |
cc293bf7 | 98 | static struct ctl_table powersave_nap_sysctl_root[] = { |
f5f10678 | 99 | { |
f5f10678 | 100 | .procname = "kernel", |
fb293ae1 | 101 | .mode = 0555, |
f5f10678 EB |
102 | .child = powersave_nap_ctl_table, |
103 | }, | |
104 | {} | |
1da177e4 LT |
105 | }; |
106 | ||
107 | static int __init | |
108 | register_powersave_nap_sysctl(void) | |
109 | { | |
0b4d4147 | 110 | register_sysctl_table(powersave_nap_sysctl_root); |
1da177e4 LT |
111 | |
112 | return 0; | |
113 | } | |
114 | __initcall(register_powersave_nap_sysctl); | |
115 | #endif |