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 }
56