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239 lines
6.1 KiB
C
239 lines
6.1 KiB
C
/*
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* linux/drivers/cpufreq/freq_table.c
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*
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* Copyright (C) 2002 - 2003 Dominik Brodowski
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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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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#define dprintk(msg...) \
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cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
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/*********************************************************************
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* FREQUENCY TABLE HELPERS *
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*********************************************************************/
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int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table)
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{
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unsigned int min_freq = ~0;
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unsigned int max_freq = 0;
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unsigned int i;
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for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
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unsigned int freq = table[i].frequency;
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if (freq == CPUFREQ_ENTRY_INVALID) {
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dprintk("table entry %u is invalid, skipping\n", i);
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continue;
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}
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dprintk("table entry %u: %u kHz, %u index\n",
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i, freq, table[i].index);
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if (freq < min_freq)
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min_freq = freq;
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if (freq > max_freq)
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max_freq = freq;
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}
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policy->min = policy->cpuinfo.min_freq = min_freq;
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policy->max = policy->cpuinfo.max_freq = max_freq;
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if (policy->min == ~0)
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return -EINVAL;
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else
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return 0;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
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int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table)
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{
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unsigned int next_larger = ~0;
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unsigned int i;
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unsigned int count = 0;
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dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n",
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policy->min, policy->max, policy->cpu);
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if (!cpu_online(policy->cpu))
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return -EINVAL;
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cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
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unsigned int freq = table[i].frequency;
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if (freq == CPUFREQ_ENTRY_INVALID)
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continue;
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if ((freq >= policy->min) && (freq <= policy->max))
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count++;
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else if ((next_larger > freq) && (freq > policy->max))
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next_larger = freq;
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}
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if (!count)
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policy->max = next_larger;
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cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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dprintk("verification lead to (%u - %u kHz) for cpu %u\n",
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policy->min, policy->max, policy->cpu);
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return 0;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
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int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table,
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unsigned int target_freq,
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unsigned int relation,
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unsigned int *index)
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{
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struct cpufreq_frequency_table optimal = {
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.index = ~0,
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.frequency = 0,
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};
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struct cpufreq_frequency_table suboptimal = {
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.index = ~0,
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.frequency = 0,
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};
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unsigned int i;
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dprintk("request for target %u kHz (relation: %u) for cpu %u\n",
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target_freq, relation, policy->cpu);
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switch (relation) {
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case CPUFREQ_RELATION_H:
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suboptimal.frequency = ~0;
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break;
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case CPUFREQ_RELATION_L:
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optimal.frequency = ~0;
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break;
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}
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if (!cpu_online(policy->cpu))
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return -EINVAL;
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for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
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unsigned int freq = table[i].frequency;
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if (freq == CPUFREQ_ENTRY_INVALID)
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continue;
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if ((freq < policy->min) || (freq > policy->max))
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continue;
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switch (relation) {
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case CPUFREQ_RELATION_H:
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if (freq <= target_freq) {
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if (freq >= optimal.frequency) {
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optimal.frequency = freq;
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optimal.index = i;
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}
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} else {
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if (freq <= suboptimal.frequency) {
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suboptimal.frequency = freq;
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suboptimal.index = i;
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}
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}
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break;
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case CPUFREQ_RELATION_L:
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if (freq >= target_freq) {
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if (freq <= optimal.frequency) {
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optimal.frequency = freq;
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optimal.index = i;
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}
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} else {
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if (freq >= suboptimal.frequency) {
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suboptimal.frequency = freq;
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suboptimal.index = i;
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}
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}
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break;
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}
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}
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if (optimal.index > i) {
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if (suboptimal.index > i)
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return -EINVAL;
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*index = suboptimal.index;
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} else
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*index = optimal.index;
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dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
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table[*index].index);
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return 0;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
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static DEFINE_PER_CPU(struct cpufreq_frequency_table *, show_table);
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/**
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* show_available_freqs - show available frequencies for the specified CPU
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*/
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static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf)
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{
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unsigned int i = 0;
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unsigned int cpu = policy->cpu;
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ssize_t count = 0;
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struct cpufreq_frequency_table *table;
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if (!per_cpu(show_table, cpu))
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return -ENODEV;
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table = per_cpu(show_table, cpu);
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for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
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if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
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continue;
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count += sprintf(&buf[count], "%d ", table[i].frequency);
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}
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count += sprintf(&buf[count], "\n");
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return count;
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}
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struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
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.attr = { .name = "scaling_available_frequencies",
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.mode = 0444,
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},
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.show = show_available_freqs,
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};
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EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
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/*
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* if you use these, you must assure that the frequency table is valid
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* all the time between get_attr and put_attr!
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*/
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void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
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unsigned int cpu)
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{
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dprintk("setting show_table for cpu %u to %p\n", cpu, table);
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per_cpu(show_table, cpu) = table;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
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void cpufreq_frequency_table_put_attr(unsigned int cpu)
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{
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dprintk("clearing show_table for cpu %u\n", cpu);
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per_cpu(show_table, cpu) = NULL;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
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struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
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{
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return per_cpu(show_table, cpu);
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
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MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
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MODULE_DESCRIPTION("CPUfreq frequency table helpers");
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MODULE_LICENSE("GPL");
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