Commit | Line | Data |
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1ea60cf7 AT |
1 | /* |
2 | * based on arch/arm/mach-kirkwood/cpuidle.c | |
3 | * | |
4 | * CPU idle support for AT91 SoC | |
5 | * | |
6 | * This file is licensed under the terms of the GNU General Public | |
7 | * License version 2. This program is licensed "as is" without any | |
8 | * warranty of any kind, whether express or implied. | |
9 | * | |
10 | * The cpu idle uses wait-for-interrupt and RAM self refresh in order | |
11 | * to implement two idle states - | |
12 | * #1 wait-for-interrupt | |
13 | * #2 wait-for-interrupt and RAM self refresh | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/cpuidle.h> | |
1ea60cf7 | 20 | #include <linux/io.h> |
dc28094b | 21 | #include <linux/export.h> |
7e348b90 RL |
22 | #include <asm/proc-fns.h> |
23 | #include <asm/cpuidle.h> | |
efd09165 | 24 | #include <mach/cpu.h> |
1ea60cf7 AT |
25 | |
26 | #include "pm.h" | |
27 | ||
28 | #define AT91_MAX_STATES 2 | |
29 | ||
30 | static DEFINE_PER_CPU(struct cpuidle_device, at91_cpuidle_device); | |
31 | ||
1ea60cf7 AT |
32 | /* Actual code that puts the SoC in different idle states */ |
33 | static int at91_enter_idle(struct cpuidle_device *dev, | |
46bcfad7 | 34 | struct cpuidle_driver *drv, |
e978aa7d | 35 | int index) |
1ea60cf7 | 36 | { |
efd09165 JCPV |
37 | if (cpu_is_at91rm9200()) |
38 | at91rm9200_standby(); | |
39 | else if (cpu_is_at91sam9g45()) | |
40 | at91sam9g45_standby(); | |
41 | else | |
42 | at91sam9_standby(); | |
00482a40 | 43 | |
e978aa7d | 44 | return index; |
1ea60cf7 AT |
45 | } |
46 | ||
7e348b90 RL |
47 | static struct cpuidle_driver at91_idle_driver = { |
48 | .name = "at91_idle", | |
49 | .owner = THIS_MODULE, | |
7e348b90 RL |
50 | .states[0] = ARM_CPUIDLE_WFI_STATE, |
51 | .states[1] = { | |
52 | .enter = at91_enter_idle, | |
53 | .exit_latency = 10, | |
54 | .target_residency = 100000, | |
55 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
56 | .name = "RAM_SR", | |
57 | .desc = "WFI and DDR Self Refresh", | |
58 | }, | |
59 | .state_count = AT91_MAX_STATES, | |
60 | }; | |
61 | ||
1ea60cf7 AT |
62 | /* Initialize CPU idle by registering the idle states */ |
63 | static int at91_init_cpuidle(void) | |
64 | { | |
65 | struct cpuidle_device *device; | |
1ea60cf7 AT |
66 | |
67 | device = &per_cpu(at91_cpuidle_device, smp_processor_id()); | |
68 | device->state_count = AT91_MAX_STATES; | |
46bcfad7 DD |
69 | |
70 | cpuidle_register_driver(&at91_idle_driver); | |
1ea60cf7 AT |
71 | |
72 | if (cpuidle_register_device(device)) { | |
73 | printk(KERN_ERR "at91_init_cpuidle: Failed registering\n"); | |
74 | return -EIO; | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | device_initcall(at91_init_cpuidle); |