Commit | Line | Data |
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e50b6bef | 1 | /* |
e50b6bef RK |
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 | |
a8e39c35 DL |
12 | * |
13 | * Maintainer: Jason Cooper <jason@lakedaemon.net> | |
14 | * Maintainer: Andrew Lunn <andrew@lunn.ch> | |
e50b6bef RK |
15 | */ |
16 | ||
17 | #include <linux/kernel.h> | |
9cfc94eb | 18 | #include <linux/module.h> |
e50b6bef RK |
19 | #include <linux/init.h> |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/cpuidle.h> | |
22 | #include <linux/io.h> | |
dc28094b | 23 | #include <linux/export.h> |
e50b6bef | 24 | #include <asm/proc-fns.h> |
b334648d | 25 | #include <asm/cpuidle.h> |
e50b6bef RK |
26 | |
27 | #define KIRKWOOD_MAX_STATES 2 | |
28 | ||
9cfc94eb AL |
29 | static void __iomem *ddr_operation_base; |
30 | ||
e50b6bef RK |
31 | /* Actual code that puts the SoC in different idle states */ |
32 | static int kirkwood_enter_idle(struct cpuidle_device *dev, | |
9cfc94eb | 33 | struct cpuidle_driver *drv, |
e978aa7d | 34 | int index) |
e50b6bef | 35 | { |
9cfc94eb | 36 | writel(0x7, ddr_operation_base); |
b334648d | 37 | cpu_do_idle(); |
e978aa7d DD |
38 | |
39 | return index; | |
e50b6bef RK |
40 | } |
41 | ||
b334648d RL |
42 | static struct cpuidle_driver kirkwood_idle_driver = { |
43 | .name = "kirkwood_idle", | |
44 | .owner = THIS_MODULE, | |
b334648d RL |
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 | }; | |
b334648d | 56 | |
e50b6bef | 57 | /* Initialize CPU idle by registering the idle states */ |
9cfc94eb | 58 | static int kirkwood_cpuidle_probe(struct platform_device *pdev) |
e50b6bef | 59 | { |
9cfc94eb AL |
60 | struct resource *res; |
61 | ||
62 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
63 | if (res == NULL) | |
64 | return -EINVAL; | |
65 | ||
488540bf SMP |
66 | ddr_operation_base = devm_ioremap_resource(&pdev->dev, res); |
67 | if (IS_ERR(ddr_operation_base)) | |
68 | return PTR_ERR(ddr_operation_base); | |
e50b6bef | 69 | |
30dc72c6 | 70 | return cpuidle_register(&kirkwood_idle_driver, NULL); |
e50b6bef RK |
71 | } |
72 | ||
9cfc94eb AL |
73 | int kirkwood_cpuidle_remove(struct platform_device *pdev) |
74 | { | |
30dc72c6 | 75 | cpuidle_unregister(&kirkwood_idle_driver); |
9cfc94eb AL |
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"); |