237 lines
6 KiB
C
237 lines
6 KiB
C
/*
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* Generic OPP helper interface for CPU device
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*
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* Copyright (C) 2009-2014 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include "opp.h"
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#ifdef CONFIG_CPU_FREQ
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/**
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* dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
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* @dev: device for which we do this operation
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* @table: Cpufreq table returned back to caller
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*
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* Generate a cpufreq table for a provided device- this assumes that the
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* opp table is already initialized and ready for usage.
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*
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* This function allocates required memory for the cpufreq table. It is
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* expected that the caller does the required maintenance such as freeing
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* the table as required.
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*
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* Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
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* if no memory available for the operation (table is not populated), returns 0
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* if successful and table is populated.
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*
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* WARNING: It is important for the callers to ensure refreshing their copy of
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* the table if any of the mentioned functions have been invoked in the interim.
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*/
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int dev_pm_opp_init_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table)
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{
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struct dev_pm_opp *opp;
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struct cpufreq_frequency_table *freq_table = NULL;
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int i, max_opps, ret = 0;
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unsigned long rate;
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max_opps = dev_pm_opp_get_opp_count(dev);
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if (max_opps <= 0)
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return max_opps ? max_opps : -ENODATA;
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freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
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if (!freq_table)
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return -ENOMEM;
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for (i = 0, rate = 0; i < max_opps; i++, rate++) {
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/* find next rate */
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opp = dev_pm_opp_find_freq_ceil(dev, &rate);
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if (IS_ERR(opp)) {
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ret = PTR_ERR(opp);
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goto out;
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}
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freq_table[i].driver_data = i;
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freq_table[i].frequency = rate / 1000;
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/* Is Boost/turbo opp ? */
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if (dev_pm_opp_is_turbo(opp))
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freq_table[i].flags = CPUFREQ_BOOST_FREQ;
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dev_pm_opp_put(opp);
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}
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freq_table[i].driver_data = i;
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freq_table[i].frequency = CPUFREQ_TABLE_END;
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*table = &freq_table[0];
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out:
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if (ret)
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kfree(freq_table);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
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/**
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* dev_pm_opp_free_cpufreq_table() - free the cpufreq table
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* @dev: device for which we do this operation
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* @table: table to free
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*
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* Free up the table allocated by dev_pm_opp_init_cpufreq_table
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*/
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void dev_pm_opp_free_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table)
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{
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if (!table)
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return;
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kfree(*table);
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*table = NULL;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
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#endif /* CONFIG_CPU_FREQ */
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void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
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{
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struct device *cpu_dev;
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int cpu;
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WARN_ON(cpumask_empty(cpumask));
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for_each_cpu(cpu, cpumask) {
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__,
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cpu);
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continue;
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}
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if (of)
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dev_pm_opp_of_remove_table(cpu_dev);
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else
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dev_pm_opp_remove_table(cpu_dev);
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}
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}
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/**
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* dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
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* @cpumask: cpumask for which OPP table needs to be removed
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*
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* This removes the OPP tables for CPUs present in the @cpumask.
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* This should be used to remove all the OPPs entries associated with
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* the cpus in @cpumask.
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*/
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void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
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{
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_dev_pm_opp_cpumask_remove_table(cpumask, false);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
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/**
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* dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
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* @cpu_dev: CPU device for which we do this operation
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* @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
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*
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* This marks OPP table of the @cpu_dev as shared by the CPUs present in
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* @cpumask.
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*
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* Returns -ENODEV if OPP table isn't already present.
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*/
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int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
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const struct cpumask *cpumask)
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{
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struct opp_device *opp_dev;
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struct opp_table *opp_table;
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struct device *dev;
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int cpu, ret = 0;
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opp_table = _find_opp_table(cpu_dev);
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if (IS_ERR(opp_table))
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return PTR_ERR(opp_table);
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for_each_cpu(cpu, cpumask) {
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if (cpu == cpu_dev->id)
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continue;
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dev = get_cpu_device(cpu);
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if (!dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
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continue;
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}
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opp_dev = _add_opp_dev(dev, opp_table);
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if (!opp_dev) {
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dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
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__func__, cpu);
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continue;
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}
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/* Mark opp-table as multiple CPUs are sharing it now */
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opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
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}
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
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/**
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* dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
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* @cpu_dev: CPU device for which we do this operation
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* @cpumask: cpumask to update with information of sharing CPUs
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*
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* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
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*
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* Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
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* table's status is access-unknown.
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*/
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int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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struct opp_device *opp_dev;
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struct opp_table *opp_table;
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int ret = 0;
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opp_table = _find_opp_table(cpu_dev);
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if (IS_ERR(opp_table))
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return PTR_ERR(opp_table);
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if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
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ret = -EINVAL;
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goto put_opp_table;
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}
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cpumask_clear(cpumask);
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if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
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list_for_each_entry(opp_dev, &opp_table->dev_list, node)
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cpumask_set_cpu(opp_dev->dev->id, cpumask);
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} else {
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cpumask_set_cpu(cpu_dev->id, cpumask);
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}
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put_opp_table:
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);
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