projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 47ac9aa1 SH |
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 <[email protected]> | |
| 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 | ||
| d9975b0b | 21 | #include <linux/cpu.h> |
| 47ac9aa1 SH |
22 | #include <linux/cpufreq.h> |
| 23 | #include <linux/module.h> | |
| 24 | #include <linux/platform_device.h> | |
| 25 | #include <linux/pm_opp.h> | |
| 26 | #include <linux/types.h> | |
| 27 | ||
| 28 | #include "arm_big_little.h" | |
| 29 | ||
| d9975b0b | 30 | static int ve_spc_init_opp_table(const struct cpumask *cpumask) |
| 47ac9aa1 | 31 | { |
| d9975b0b | 32 | struct device *cpu_dev = get_cpu_device(cpumask_first(cpumask)); |
| 47ac9aa1 SH |
33 | /* |
| 34 | * platform specific SPC code must initialise the opp table | |
| 35 | * so just check if the OPP count is non-zero | |
| 36 | */ | |
| 37 | return dev_pm_opp_get_opp_count(cpu_dev) <= 0; | |
| 38 | } | |
| 39 | ||
| 40 | static int ve_spc_get_transition_latency(struct device *cpu_dev) | |
| 41 | { | |
| 42 | return 1000000; /* 1 ms */ | |
| 43 | } | |
| 44 | ||
| 45 | static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { | |
| 46 | .name = "vexpress-spc", | |
| 47 | .get_transition_latency = ve_spc_get_transition_latency, | |
| 48 | .init_opp_table = ve_spc_init_opp_table, | |
| 49 | }; | |
| 50 | ||
| 51 | static int ve_spc_cpufreq_probe(struct platform_device *pdev) | |
| 52 | { | |
| 53 | return bL_cpufreq_register(&ve_spc_cpufreq_ops); | |
| 54 | } | |
| 55 | ||
| 56 | static int ve_spc_cpufreq_remove(struct platform_device *pdev) | |
| 57 | { | |
| 58 | bL_cpufreq_unregister(&ve_spc_cpufreq_ops); | |
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| 62 | static struct platform_driver ve_spc_cpufreq_platdrv = { | |
| 63 | .driver = { | |
| 64 | .name = "vexpress-spc-cpufreq", | |
| 47ac9aa1 SH |
65 | }, |
| 66 | .probe = ve_spc_cpufreq_probe, | |
| 67 | .remove = ve_spc_cpufreq_remove, | |
| 68 | }; | |
| 69 | module_platform_driver(ve_spc_cpufreq_platdrv); | |
| 70 | ||
| 71 | MODULE_LICENSE("GPL"); |