1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Freescale Semiconductor, Inc.
4  * Copyright 2017-2018 NXP
5  *   Anson Huang <Anson.Huang@nxp.com>
6  */
7 
8 #include <linux/cpuidle.h>
9 #include <linux/module.h>
10 #include <asm/cpuidle.h>
11 
12 #include "common.h"
13 #include "cpuidle.h"
14 
15 static int imx7ulp_enter_wait(struct cpuidle_device *dev,
16 			    struct cpuidle_driver *drv, int index)
17 {
18 	if (index == 1)
19 		imx7ulp_set_lpm(ULP_PM_WAIT);
20 	else
21 		imx7ulp_set_lpm(ULP_PM_STOP);
22 
23 	cpu_do_idle();
24 
25 	imx7ulp_set_lpm(ULP_PM_RUN);
26 
27 	return index;
28 }
29 
30 static struct cpuidle_driver imx7ulp_cpuidle_driver = {
31 	.name = "imx7ulp_cpuidle",
32 	.owner = THIS_MODULE,
33 	.states = {
34 		/* WFI */
35 		ARM_CPUIDLE_WFI_STATE,
36 		/* WAIT */
37 		{
38 			.exit_latency = 50,
39 			.target_residency = 75,
40 			.enter = imx7ulp_enter_wait,
41 			.name = "WAIT",
42 			.desc = "PSTOP2",
43 		},
44 		/* STOP */
45 		{
46 			.exit_latency = 100,
47 			.target_residency = 150,
48 			.enter = imx7ulp_enter_wait,
49 			.name = "STOP",
50 			.desc = "PSTOP1",
51 		},
52 	},
53 	.state_count = 3,
54 	.safe_state_index = 0,
55 };
56 
57 int __init imx7ulp_cpuidle_init(void)
58 {
59 	return cpuidle_register(&imx7ulp_cpuidle_driver, NULL);
60 }
61