1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * CLPS711X CPU idle driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/cpuidle.h>
9*4882a593Smuzhiyun #include <linux/err.h>
10*4882a593Smuzhiyun #include <linux/io.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun static void __iomem *clps711x_halt;
17*4882a593Smuzhiyun
clps711x_cpuidle_halt(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)18*4882a593Smuzhiyun static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
19*4882a593Smuzhiyun struct cpuidle_driver *drv, int index)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun writel(0xaa, clps711x_halt);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return index;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static struct cpuidle_driver clps711x_idle_driver = {
27*4882a593Smuzhiyun .name = CLPS711X_CPUIDLE_NAME,
28*4882a593Smuzhiyun .owner = THIS_MODULE,
29*4882a593Smuzhiyun .states[0] = {
30*4882a593Smuzhiyun .name = "HALT",
31*4882a593Smuzhiyun .desc = "CLPS711X HALT",
32*4882a593Smuzhiyun .enter = clps711x_cpuidle_halt,
33*4882a593Smuzhiyun .exit_latency = 1,
34*4882a593Smuzhiyun },
35*4882a593Smuzhiyun .state_count = 1,
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
clps711x_cpuidle_probe(struct platform_device * pdev)38*4882a593Smuzhiyun static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun clps711x_halt = devm_platform_ioremap_resource(pdev, 0);
41*4882a593Smuzhiyun if (IS_ERR(clps711x_halt))
42*4882a593Smuzhiyun return PTR_ERR(clps711x_halt);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return cpuidle_register(&clps711x_idle_driver, NULL);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun static struct platform_driver clps711x_cpuidle_driver = {
48*4882a593Smuzhiyun .driver = {
49*4882a593Smuzhiyun .name = CLPS711X_CPUIDLE_NAME,
50*4882a593Smuzhiyun },
51*4882a593Smuzhiyun };
52*4882a593Smuzhiyun builtin_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);
53