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 __cpuidle 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
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