GNU Linux-libre 4.19.314-gnu1
[releases.git] / arch / arm / mach-imx / cpuidle-imx6sl.c
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
13 #include "common.h"
14 #include "cpuidle.h"
15
16 static int imx6sl_enter_wait(struct cpuidle_device *dev,
17                             struct cpuidle_driver *drv, int index)
18 {
19         imx6_set_lpm(WAIT_UNCLOCKED);
20         /*
21          * Software workaround for ERR005311, see function
22          * description for details.
23          */
24         imx6sl_set_wait_clk(true);
25         cpu_do_idle();
26         imx6sl_set_wait_clk(false);
27         imx6_set_lpm(WAIT_CLOCKED);
28
29         return index;
30 }
31
32 static struct cpuidle_driver imx6sl_cpuidle_driver = {
33         .name = "imx6sl_cpuidle",
34         .owner = THIS_MODULE,
35         .states = {
36                 /* WFI */
37                 ARM_CPUIDLE_WFI_STATE,
38                 /* WAIT */
39                 {
40                         .exit_latency = 50,
41                         .target_residency = 75,
42                         .flags = CPUIDLE_FLAG_TIMER_STOP,
43                         .enter = imx6sl_enter_wait,
44                         .name = "WAIT",
45                         .desc = "Clock off",
46                 },
47         },
48         .state_count = 2,
49         .safe_state_index = 0,
50 };
51
52 int __init imx6sl_cpuidle_init(void)
53 {
54         return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
55 }