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7c7f8f7f AS |
1 | /* |
2 | * CLPS711X CPU idle driver | |
3 | * | |
4 | * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/cpuidle.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/io.h> | |
94e8057b | 15 | #include <linux/init.h> |
7c7f8f7f AS |
16 | #include <linux/platform_device.h> |
17 | ||
18 | #define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle" | |
19 | ||
20 | static void __iomem *clps711x_halt; | |
21 | ||
22 | static int clps711x_cpuidle_halt(struct cpuidle_device *dev, | |
23 | struct cpuidle_driver *drv, int index) | |
24 | { | |
25 | writel(0xaa, clps711x_halt); | |
26 | ||
27 | return index; | |
28 | } | |
29 | ||
30 | static struct cpuidle_driver clps711x_idle_driver = { | |
31 | .name = CLPS711X_CPUIDLE_NAME, | |
32 | .owner = THIS_MODULE, | |
33 | .states[0] = { | |
34 | .name = "HALT", | |
35 | .desc = "CLPS711X HALT", | |
36 | .enter = clps711x_cpuidle_halt, | |
37 | .exit_latency = 1, | |
38 | }, | |
39 | .state_count = 1, | |
40 | }; | |
41 | ||
42 | static int __init clps711x_cpuidle_probe(struct platform_device *pdev) | |
43 | { | |
44 | struct resource *res; | |
45 | ||
46 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
47 | clps711x_halt = devm_ioremap_resource(&pdev->dev, res); | |
48 | if (IS_ERR(clps711x_halt)) | |
49 | return PTR_ERR(clps711x_halt); | |
50 | ||
51 | return cpuidle_register(&clps711x_idle_driver, NULL); | |
52 | } | |
53 | ||
54 | static struct platform_driver clps711x_cpuidle_driver = { | |
55 | .driver = { | |
56 | .name = CLPS711X_CPUIDLE_NAME, | |
7c7f8f7f AS |
57 | }, |
58 | }; | |
94e8057b | 59 | builtin_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe); |