Commit | Line | Data |
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12bb3440 SG |
1 | /* |
2 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/cpuidle.h> | |
10 | #include <linux/module.h> | |
11 | #include <asm/cpuidle.h> | |
12 | ||
e5f9dec8 | 13 | #include "common.h" |
12bb3440 | 14 | #include "cpuidle.h" |
a25d67a4 | 15 | #include "hardware.h" |
12bb3440 | 16 | |
e5f9dec8 SG |
17 | static atomic_t master = ATOMIC_INIT(0); |
18 | static DEFINE_SPINLOCK(master_lock); | |
19 | ||
20 | static int imx6q_enter_wait(struct cpuidle_device *dev, | |
21 | struct cpuidle_driver *drv, int index) | |
22 | { | |
e5f9dec8 SG |
23 | if (atomic_inc_return(&master) == num_online_cpus()) { |
24 | /* | |
25 | * With this lock, we prevent other cpu to exit and enter | |
26 | * this function again and become the master. | |
27 | */ | |
28 | if (!spin_trylock(&master_lock)) | |
29 | goto idle; | |
8fb76a07 | 30 | imx6_set_lpm(WAIT_UNCLOCKED); |
e5f9dec8 | 31 | cpu_do_idle(); |
8fb76a07 | 32 | imx6_set_lpm(WAIT_CLOCKED); |
e5f9dec8 SG |
33 | spin_unlock(&master_lock); |
34 | goto done; | |
35 | } | |
36 | ||
37 | idle: | |
38 | cpu_do_idle(); | |
39 | done: | |
40 | atomic_dec(&master); | |
e5f9dec8 SG |
41 | |
42 | return index; | |
43 | } | |
44 | ||
12bb3440 SG |
45 | static struct cpuidle_driver imx6q_cpuidle_driver = { |
46 | .name = "imx6q_cpuidle", | |
47 | .owner = THIS_MODULE, | |
e5f9dec8 SG |
48 | .states = { |
49 | /* WFI */ | |
50 | ARM_CPUIDLE_WFI_STATE, | |
51 | /* WAIT */ | |
52 | { | |
53 | .exit_latency = 50, | |
54 | .target_residency = 75, | |
b82b6cca | 55 | .flags = CPUIDLE_FLAG_TIMER_STOP, |
e5f9dec8 SG |
56 | .enter = imx6q_enter_wait, |
57 | .name = "WAIT", | |
58 | .desc = "Clock off", | |
59 | }, | |
60 | }, | |
61 | .state_count = 2, | |
62 | .safe_state_index = 0, | |
12bb3440 SG |
63 | }; |
64 | ||
65 | int __init imx6q_cpuidle_init(void) | |
66 | { | |
fa6be65e | 67 | /* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */ |
dfea953a | 68 | imx6q_set_int_mem_clk_lpm(true); |
e5f9dec8 | 69 | |
54a4644b | 70 | return cpuidle_register(&imx6q_cpuidle_driver, NULL); |
12bb3440 | 71 | } |