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1 | /* |
2 | * Versatile Express SPC CPUFreq Interface driver | |
3 | * | |
4 | * It provides necessary ops to arm_big_little cpufreq driver. | |
5 | * | |
6 | * Copyright (C) 2013 ARM Ltd. | |
7 | * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
14 | * kind, whether express or implied; without even the implied warranty | |
15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/cpufreq.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/pm_opp.h> | |
25 | #include <linux/types.h> | |
26 | ||
27 | #include "arm_big_little.h" | |
28 | ||
29 | static int ve_spc_init_opp_table(struct device *cpu_dev) | |
30 | { | |
31 | /* | |
32 | * platform specific SPC code must initialise the opp table | |
33 | * so just check if the OPP count is non-zero | |
34 | */ | |
35 | return dev_pm_opp_get_opp_count(cpu_dev) <= 0; | |
36 | } | |
37 | ||
38 | static int ve_spc_get_transition_latency(struct device *cpu_dev) | |
39 | { | |
40 | return 1000000; /* 1 ms */ | |
41 | } | |
42 | ||
43 | static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { | |
44 | .name = "vexpress-spc", | |
45 | .get_transition_latency = ve_spc_get_transition_latency, | |
46 | .init_opp_table = ve_spc_init_opp_table, | |
47 | }; | |
48 | ||
49 | static int ve_spc_cpufreq_probe(struct platform_device *pdev) | |
50 | { | |
51 | return bL_cpufreq_register(&ve_spc_cpufreq_ops); | |
52 | } | |
53 | ||
54 | static int ve_spc_cpufreq_remove(struct platform_device *pdev) | |
55 | { | |
56 | bL_cpufreq_unregister(&ve_spc_cpufreq_ops); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static struct platform_driver ve_spc_cpufreq_platdrv = { | |
61 | .driver = { | |
62 | .name = "vexpress-spc-cpufreq", | |
47ac9aa1 SK |
63 | }, |
64 | .probe = ve_spc_cpufreq_probe, | |
65 | .remove = ve_spc_cpufreq_remove, | |
66 | }; | |
67 | module_platform_driver(ve_spc_cpufreq_platdrv); | |
68 | ||
69 | MODULE_LICENSE("GPL"); |