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70 lines
1.9 KiB
70 lines
1.9 KiB
/* |
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* Versatile Express SPC CPUFreq Interface driver |
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* |
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* It provides necessary ops to arm_big_little cpufreq driver. |
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* |
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* Copyright (C) 2013 ARM Ltd. |
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* Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/cpufreq.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_opp.h> |
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#include <linux/types.h> |
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#include "arm_big_little.h" |
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static int ve_spc_init_opp_table(struct device *cpu_dev) |
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{ |
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/* |
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* platform specific SPC code must initialise the opp table |
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* so just check if the OPP count is non-zero |
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*/ |
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return dev_pm_opp_get_opp_count(cpu_dev) <= 0; |
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} |
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static int ve_spc_get_transition_latency(struct device *cpu_dev) |
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{ |
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return 1000000; /* 1 ms */ |
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} |
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static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { |
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.name = "vexpress-spc", |
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.get_transition_latency = ve_spc_get_transition_latency, |
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.init_opp_table = ve_spc_init_opp_table, |
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}; |
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static int ve_spc_cpufreq_probe(struct platform_device *pdev) |
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{ |
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return bL_cpufreq_register(&ve_spc_cpufreq_ops); |
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} |
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static int ve_spc_cpufreq_remove(struct platform_device *pdev) |
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{ |
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bL_cpufreq_unregister(&ve_spc_cpufreq_ops); |
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return 0; |
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} |
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static struct platform_driver ve_spc_cpufreq_platdrv = { |
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.driver = { |
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.name = "vexpress-spc-cpufreq", |
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.owner = THIS_MODULE, |
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}, |
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.probe = ve_spc_cpufreq_probe, |
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.remove = ve_spc_cpufreq_remove, |
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}; |
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module_platform_driver(ve_spc_cpufreq_platdrv); |
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MODULE_LICENSE("GPL");
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