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 struct cpufreq_frequency_table *pos;
25 unsigned int min_freq = ~0;
26 unsigned int max_freq = 0;
29 cpufreq_for_each_valid_entry(pos, table) {
30 freq = pos->frequency;
32 if (!cpufreq_boost_enabled()
33 && (pos->flags & CPUFREQ_BOOST_FREQ))
36 pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
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 struct cpufreq_frequency_table *pos;
58 unsigned int freq, next_larger = ~0;
61 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
62 policy->min, policy->max, policy->cpu);
64 cpufreq_verify_within_cpu_limits(policy);
66 cpufreq_for_each_valid_entry(pos, table) {
67 freq = pos->frequency;
69 if ((freq >= policy->min) && (freq <= policy->max)) {
74 if ((next_larger > freq) && (freq > policy->max))
79 policy->max = next_larger;
80 cpufreq_verify_within_cpu_limits(policy);
83 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
84 policy->min, policy->max, policy->cpu);
88 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
91 * Generic routine to verify policy & frequency table, requires driver to set
92 * policy->freq_table prior to it.
94 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
96 struct cpufreq_frequency_table *table =
97 cpufreq_frequency_get_table(policy->cpu);
101 return cpufreq_frequency_table_verify(policy, table);
103 EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
105 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
106 struct cpufreq_frequency_table *table,
107 unsigned int target_freq,
108 unsigned int relation,
111 struct cpufreq_frequency_table optimal = {
115 struct cpufreq_frequency_table suboptimal = {
119 struct cpufreq_frequency_table *pos;
120 unsigned int freq, i = 0;
122 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
123 target_freq, relation, policy->cpu);
126 case CPUFREQ_RELATION_H:
127 suboptimal.frequency = ~0;
129 case CPUFREQ_RELATION_L:
130 optimal.frequency = ~0;
134 cpufreq_for_each_valid_entry(pos, table) {
135 freq = pos->frequency;
138 if ((freq < policy->min) || (freq > policy->max))
141 case CPUFREQ_RELATION_H:
142 if (freq <= target_freq) {
143 if (freq >= optimal.frequency) {
144 optimal.frequency = freq;
145 optimal.driver_data = i;
148 if (freq <= suboptimal.frequency) {
149 suboptimal.frequency = freq;
150 suboptimal.driver_data = i;
154 case CPUFREQ_RELATION_L:
155 if (freq >= target_freq) {
156 if (freq <= optimal.frequency) {
157 optimal.frequency = freq;
158 optimal.driver_data = i;
161 if (freq >= suboptimal.frequency) {
162 suboptimal.frequency = freq;
163 suboptimal.driver_data = i;
169 if (optimal.driver_data > i) {
170 if (suboptimal.driver_data > i)
172 *index = suboptimal.driver_data;
174 *index = optimal.driver_data;
176 pr_debug("target index is %u, freq is:%u kHz\n", *index,
177 table[*index].frequency);
181 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
183 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
186 struct cpufreq_frequency_table *pos, *table;
188 table = cpufreq_frequency_get_table(policy->cpu);
189 if (unlikely(!table)) {
190 pr_debug("%s: Unable to find frequency table\n", __func__);
194 cpufreq_for_each_valid_entry(pos, table)
195 if (pos->frequency == freq)
200 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
203 * show_available_freqs - show available frequencies for the specified CPU
205 static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
209 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
214 cpufreq_for_each_valid_entry(pos, table) {
216 * show_boost = true and driver_data = BOOST freq
217 * display BOOST freqs
219 * show_boost = false and driver_data = BOOST freq
220 * show_boost = true and driver_data != BOOST freq
221 * continue - do not display anything
223 * show_boost = false and driver_data != BOOST freq
224 * display NON BOOST freqs
226 if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
229 count += sprintf(&buf[count], "%d ", pos->frequency);
231 count += sprintf(&buf[count], "\n");
237 #define cpufreq_attr_available_freq(_name) \
238 struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
239 __ATTR_RO(_name##_frequencies)
242 * show_scaling_available_frequencies - show available normal frequencies for
245 static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
248 return show_available_freqs(policy, buf, false);
250 cpufreq_attr_available_freq(scaling_available);
251 EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
254 * show_available_boost_freqs - show available boost frequencies for
257 static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
260 return show_available_freqs(policy, buf, true);
262 cpufreq_attr_available_freq(scaling_boost);
263 EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
265 struct freq_attr *cpufreq_generic_attr[] = {
266 &cpufreq_freq_attr_scaling_available_freqs,
267 #ifdef CONFIG_CPU_FREQ_BOOST_SW
268 &cpufreq_freq_attr_scaling_boost_freqs,
272 EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
274 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
275 struct cpufreq_frequency_table *table)
277 int ret = cpufreq_frequency_table_cpuinfo(policy, table);
280 policy->freq_table = table;
284 EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
286 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
288 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
290 struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
291 return policy ? policy->freq_table : NULL;
293 EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
295 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
296 MODULE_DESCRIPTION("CPUfreq frequency table helpers");
297 MODULE_LICENSE("GPL");