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7426394f MD |
1 | /* |
2 | * arch/sh/kernel/cpu/shmobile/cpuidle.c | |
3 | * | |
4 | * Cpuidle support code for SuperH Mobile | |
5 | * | |
6 | * Copyright (C) 2009 Magnus Damm | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/suspend.h> | |
16 | #include <linux/cpuidle.h> | |
f7be3455 | 17 | #include <linux/export.h> |
7426394f | 18 | #include <asm/suspend.h> |
7c0f6ba6 | 19 | #include <linux/uaccess.h> |
7426394f MD |
20 | |
21 | static unsigned long cpuidle_mode[] = { | |
22 | SUSP_SH_SLEEP, /* regular sleep mode */ | |
23 | SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */ | |
63cd91df | 24 | SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */ |
7426394f MD |
25 | }; |
26 | ||
27 | static int cpuidle_sleep_enter(struct cpuidle_device *dev, | |
46bcfad7 | 28 | struct cpuidle_driver *drv, |
e978aa7d | 29 | int index) |
7426394f | 30 | { |
4be88734 | 31 | unsigned long allowed_mode = SUSP_SH_SLEEP; |
e978aa7d | 32 | int requested_state = index; |
7426394f MD |
33 | int allowed_state; |
34 | int k; | |
35 | ||
36 | /* convert allowed mode to allowed state */ | |
37 | for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--) | |
38 | if (cpuidle_mode[k] == allowed_mode) | |
39 | break; | |
40 | ||
41 | allowed_state = k; | |
42 | ||
43 | /* take the following into account for sleep mode selection: | |
44 | * - allowed_state: best mode allowed by hardware (clock deps) | |
45 | * - requested_state: best mode allowed by software (latencies) | |
46 | */ | |
47 | k = min_t(int, allowed_state, requested_state); | |
48 | ||
7426394f | 49 | sh_mobile_call_standby(cpuidle_mode[k]); |
e978aa7d DD |
50 | |
51 | return k; | |
7426394f MD |
52 | } |
53 | ||
7426394f | 54 | static struct cpuidle_driver cpuidle_driver = { |
0a4f841e DL |
55 | .name = "sh_idle", |
56 | .owner = THIS_MODULE, | |
0a4f841e DL |
57 | .states = { |
58 | { | |
59 | .exit_latency = 1, | |
60 | .target_residency = 1 * 2, | |
61 | .power_usage = 3, | |
0a4f841e DL |
62 | .enter = cpuidle_sleep_enter, |
63 | .name = "C1", | |
64 | .desc = "SuperH Sleep Mode", | |
65 | }, | |
66 | { | |
67 | .exit_latency = 100, | |
68 | .target_residency = 1 * 2, | |
69 | .power_usage = 1, | |
0a4f841e DL |
70 | .enter = cpuidle_sleep_enter, |
71 | .name = "C2", | |
72 | .desc = "SuperH Sleep Mode [SF]", | |
73 | .disabled = true, | |
74 | }, | |
75 | { | |
76 | .exit_latency = 2300, | |
77 | .target_residency = 1 * 2, | |
78 | .power_usage = 1, | |
0a4f841e DL |
79 | .enter = cpuidle_sleep_enter, |
80 | .name = "C3", | |
81 | .desc = "SuperH Mobile Standby Mode [SF]", | |
82 | .disabled = true, | |
83 | }, | |
84 | }, | |
85 | .safe_state_index = 0, | |
86 | .state_count = 3, | |
7426394f MD |
87 | }; |
88 | ||
38a94f41 | 89 | int __init sh_mobile_setup_cpuidle(void) |
7426394f | 90 | { |
0a4f841e DL |
91 | if (sh_mobile_sleep_supported & SUSP_SH_SF) |
92 | cpuidle_driver.states[1].disabled = false; | |
7426394f | 93 | |
0a4f841e DL |
94 | if (sh_mobile_sleep_supported & SUSP_SH_STANDBY) |
95 | cpuidle_driver.states[2].disabled = false; | |
7426394f | 96 | |
c78e4360 | 97 | return cpuidle_register(&cpuidle_driver, NULL); |
7426394f | 98 | } |