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751f7e99 AH |
1 | /* |
2 | * Copyright (C) 2014 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 | #include <asm/proc-fns.h> | |
13 | ||
14 | #include "common.h" | |
15 | #include "cpuidle.h" | |
16 | ||
17 | static int imx6sl_enter_wait(struct cpuidle_device *dev, | |
18 | struct cpuidle_driver *drv, int index) | |
19 | { | |
20 | imx6q_set_lpm(WAIT_UNCLOCKED); | |
21 | /* | |
22 | * Software workaround for ERR005311, see function | |
23 | * description for details. | |
24 | */ | |
25 | imx6sl_set_wait_clk(true); | |
26 | cpu_do_idle(); | |
27 | imx6sl_set_wait_clk(false); | |
28 | imx6q_set_lpm(WAIT_CLOCKED); | |
29 | ||
30 | return index; | |
31 | } | |
32 | ||
33 | static struct cpuidle_driver imx6sl_cpuidle_driver = { | |
34 | .name = "imx6sl_cpuidle", | |
35 | .owner = THIS_MODULE, | |
36 | .states = { | |
37 | /* WFI */ | |
38 | ARM_CPUIDLE_WFI_STATE, | |
39 | /* WAIT */ | |
40 | { | |
41 | .exit_latency = 50, | |
42 | .target_residency = 75, | |
43 | .flags = CPUIDLE_FLAG_TIME_VALID | | |
44 | CPUIDLE_FLAG_TIMER_STOP, | |
45 | .enter = imx6sl_enter_wait, | |
46 | .name = "WAIT", | |
47 | .desc = "Clock off", | |
48 | }, | |
49 | }, | |
50 | .state_count = 2, | |
51 | .safe_state_index = 0, | |
52 | }; | |
53 | ||
54 | int __init imx6sl_cpuidle_init(void) | |
55 | { | |
56 | return cpuidle_register(&imx6sl_cpuidle_driver, NULL); | |
57 | } |