1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014 Freescale Semiconductor, Inc.
4 */
5
6 #include <linux/clk/imx.h>
7 #include <linux/cpuidle.h>
8 #include <linux/module.h>
9 #include <asm/cpuidle.h>
10
11 #include "common.h"
12 #include "cpuidle.h"
13
14 static __cpuidle int imx6sl_enter_wait(struct cpuidle_device *dev,
15 struct cpuidle_driver *drv, int index)
16 {
17 imx6_set_lpm(WAIT_UNCLOCKED);
18 /*
19 * Software workaround for ERR005311, see function
20 * description for details.
21 */
22 imx6sl_set_wait_clk(true);
23 cpu_do_idle();
24 imx6sl_set_wait_clk(false);
25 imx6_set_lpm(WAIT_CLOCKED);
26
27 return index;
28 }
29
30 static struct cpuidle_driver imx6sl_cpuidle_driver = {
31 .name = "imx6sl_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 .flags = CPUIDLE_FLAG_TIMER_STOP,
41 .enter = imx6sl_enter_wait,
42 .name = "WAIT",
43 .desc = "Clock off",
44 },
45 },
46 .state_count = 2,
47 .safe_state_index = 0,
48 };
49
50 int __init imx6sl_cpuidle_init(void)
51 {
52 return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
53 }
54
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