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1 | /* |
2 | * CPU idle Marvell Kirkwood SoCs |
3 | * |
4 | * This file is licensed under the terms of the GNU General Public |
5 | * License version 2. This program is licensed "as is" without any |
6 | * warranty of any kind, whether express or implied. |
7 | * |
8 | * The cpu idle uses wait-for-interrupt and DDR self refresh in order |
9 | * to implement two idle states - |
10 | * #1 wait-for-interrupt |
11 | * #2 wait-for-interrupt and DDR self refresh |
12 | * |
13 | * Maintainer: Jason Cooper <jason@lakedaemon.net> |
14 | * Maintainer: Andrew Lunn <andrew@lunn.ch> |
15 | */ |
16 | |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/cpuidle.h> |
22 | #include <linux/io.h> |
23 | #include <linux/export.h> |
24 | #include <asm/proc-fns.h> |
25 | #include <asm/cpuidle.h> |
26 | |
27 | #define KIRKWOOD_MAX_STATES 2 |
28 | |
29 | static void __iomem *ddr_operation_base; |
30 | |
31 | /* Actual code that puts the SoC in different idle states */ |
32 | static int kirkwood_enter_idle(struct cpuidle_device *dev, |
33 | struct cpuidle_driver *drv, |
34 | int index) |
35 | { |
36 | writel(0x7, ddr_operation_base); |
37 | cpu_do_idle(); |
38 | |
39 | return index; |
40 | } |
41 | |
42 | static struct cpuidle_driver kirkwood_idle_driver = { |
43 | .name = "kirkwood_idle", |
44 | .owner = THIS_MODULE, |
45 | .states[0] = ARM_CPUIDLE_WFI_STATE, |
46 | .states[1] = { |
47 | .enter = kirkwood_enter_idle, |
48 | .exit_latency = 10, |
49 | .target_residency = 100000, |
50 | .flags = CPUIDLE_FLAG_TIME_VALID, |
51 | .name = "DDR SR", |
52 | .desc = "WFI and DDR Self Refresh", |
53 | }, |
54 | .state_count = KIRKWOOD_MAX_STATES, |
55 | }; |
56 | |
57 | /* Initialize CPU idle by registering the idle states */ |
58 | static int kirkwood_cpuidle_probe(struct platform_device *pdev) |
59 | { |
60 | struct resource *res; |
61 | |
62 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
63 | if (res == NULL) |
64 | return -EINVAL; |
65 | |
66 | ddr_operation_base = devm_ioremap_resource(&pdev->dev, res); |
67 | if (IS_ERR(ddr_operation_base)) |
68 | return PTR_ERR(ddr_operation_base); |
69 | |
70 | return cpuidle_register(&kirkwood_idle_driver, NULL); |
71 | } |
72 | |
73 | int kirkwood_cpuidle_remove(struct platform_device *pdev) |
74 | { |
75 | cpuidle_unregister(&kirkwood_idle_driver); |
76 | return 0; |
77 | } |
78 | |
79 | static struct platform_driver kirkwood_cpuidle_driver = { |
80 | .probe = kirkwood_cpuidle_probe, |
81 | .remove = kirkwood_cpuidle_remove, |
82 | .driver = { |
83 | .name = "kirkwood_cpuidle", |
84 | .owner = THIS_MODULE, |
85 | }, |
86 | }; |
87 | |
88 | module_platform_driver(kirkwood_cpuidle_driver); |
89 | |
90 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); |
91 | MODULE_DESCRIPTION("Kirkwood cpu idle driver"); |
92 | MODULE_LICENSE("GPL v2"); |
93 | MODULE_ALIAS("platform:kirkwood-cpuidle"); |
94 |
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