2 * linux/drivers/cpufreq/freq_table.c
4 * Copyright (C) 2002 - 2003 Dominik Brodowski
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/cpufreq.h>
15 #include <linux/module.h>
17 /*********************************************************************
18 * FREQUENCY TABLE HELPERS *
19 *********************************************************************/
21 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
22 struct cpufreq_frequency_table *table)
24 unsigned int min_freq = ~0;
25 unsigned int max_freq = 0;
28 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
29 unsigned int freq = table[i].frequency;
30 if (freq == CPUFREQ_ENTRY_INVALID) {
31 pr_debug("table entry %u is invalid, skipping\n", i);
35 pr_debug("table entry %u: %u kHz, %u driver_data\n",
36 i, freq, table[i].driver_data);
43 policy->min = policy->cpuinfo.min_freq = min_freq;
44 policy->max = policy->cpuinfo.max_freq = max_freq;
46 if (policy->min == ~0)
51 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
54 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
55 struct cpufreq_frequency_table *table)
57 unsigned int next_larger = ~0, freq, i = 0;
60 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
61 policy->min, policy->max, policy->cpu);
63 cpufreq_verify_within_cpu_limits(policy);
65 for (; freq = table[i].frequency, freq != CPUFREQ_TABLE_END; i++) {
66 if (freq == CPUFREQ_ENTRY_INVALID)
68 if ((freq >= policy->min) && (freq <= policy->max)) {
73 if ((next_larger > freq) && (freq > policy->max))
78 policy->max = next_larger;
79 cpufreq_verify_within_cpu_limits(policy);
82 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
83 policy->min, policy->max, policy->cpu);
87 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
90 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
91 struct cpufreq_frequency_table *table,
92 unsigned int target_freq,
93 unsigned int relation,
96 struct cpufreq_frequency_table optimal = {
100 struct cpufreq_frequency_table suboptimal = {
106 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
107 target_freq, relation, policy->cpu);
110 case CPUFREQ_RELATION_H:
111 suboptimal.frequency = ~0;
113 case CPUFREQ_RELATION_L:
114 optimal.frequency = ~0;
118 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
119 unsigned int freq = table[i].frequency;
120 if (freq == CPUFREQ_ENTRY_INVALID)
122 if ((freq < policy->min) || (freq > policy->max))
125 case CPUFREQ_RELATION_H:
126 if (freq <= target_freq) {
127 if (freq >= optimal.frequency) {
128 optimal.frequency = freq;
129 optimal.driver_data = i;
132 if (freq <= suboptimal.frequency) {
133 suboptimal.frequency = freq;
134 suboptimal.driver_data = i;
138 case CPUFREQ_RELATION_L:
139 if (freq >= target_freq) {
140 if (freq <= optimal.frequency) {
141 optimal.frequency = freq;
142 optimal.driver_data = i;
145 if (freq >= suboptimal.frequency) {
146 suboptimal.frequency = freq;
147 suboptimal.driver_data = i;
153 if (optimal.driver_data > i) {
154 if (suboptimal.driver_data > i)
156 *index = suboptimal.driver_data;
158 *index = optimal.driver_data;
160 pr_debug("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
161 table[*index].driver_data);
165 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
167 static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
169 * show_available_freqs - show available frequencies for the specified CPU
171 static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf)
174 unsigned int cpu = policy->cpu;
176 struct cpufreq_frequency_table *table;
178 if (!per_cpu(cpufreq_show_table, cpu))
181 table = per_cpu(cpufreq_show_table, cpu);
183 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
184 if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
186 count += sprintf(&buf[count], "%d ", table[i].frequency);
188 count += sprintf(&buf[count], "\n");
194 struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
195 .attr = { .name = "scaling_available_frequencies",
198 .show = show_available_freqs,
200 EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
203 * if you use these, you must assure that the frequency table is valid
204 * all the time between get_attr and put_attr!
206 void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
209 pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
210 per_cpu(cpufreq_show_table, cpu) = table;
212 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
214 void cpufreq_frequency_table_put_attr(unsigned int cpu)
216 pr_debug("clearing show_table for cpu %u\n", cpu);
217 per_cpu(cpufreq_show_table, cpu) = NULL;
219 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
221 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
222 struct cpufreq_frequency_table *table)
224 int ret = cpufreq_frequency_table_cpuinfo(policy, table);
227 cpufreq_frequency_table_get_attr(table, policy->cpu);
231 EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
233 void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy)
235 pr_debug("Updating show_table for new_cpu %u from last_cpu %u\n",
236 policy->cpu, policy->last_cpu);
237 per_cpu(cpufreq_show_table, policy->cpu) = per_cpu(cpufreq_show_table,
239 per_cpu(cpufreq_show_table, policy->last_cpu) = NULL;
242 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
244 return per_cpu(cpufreq_show_table, cpu);
246 EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
248 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
249 MODULE_DESCRIPTION("CPUfreq frequency table helpers");
250 MODULE_LICENSE("GPL");