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path: root/drivers/cpufreq/freq_table.c
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Diffstat (limited to 'drivers/cpufreq/freq_table.c')
-rw-r--r--drivers/cpufreq/freq_table.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
new file mode 100644
index 000000000..df14766a8
--- /dev/null
+++ b/drivers/cpufreq/freq_table.c
@@ -0,0 +1,311 @@
+/*
+ * linux/drivers/cpufreq/freq_table.c
+ *
+ * Copyright (C) 2002 - 2003 Dominik Brodowski
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpufreq.h>
+#include <linux/module.h>
+
+/*********************************************************************
+ * FREQUENCY TABLE HELPERS *
+ *********************************************************************/
+
+int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ struct cpufreq_frequency_table *pos;
+ unsigned int min_freq = ~0;
+ unsigned int max_freq = 0;
+ unsigned int freq;
+
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;
+
+ if (!cpufreq_boost_enabled()
+ && (pos->flags & CPUFREQ_BOOST_FREQ))
+ continue;
+
+ pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
+ if (freq < min_freq)
+ min_freq = freq;
+ if (freq > max_freq)
+ max_freq = freq;
+ }
+
+ policy->min = policy->cpuinfo.min_freq = min_freq;
+ policy->max = policy->cpuinfo.max_freq = max_freq;
+
+ if (policy->min == ~0)
+ return -EINVAL;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
+
+
+int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ struct cpufreq_frequency_table *pos;
+ unsigned int freq, next_larger = ~0;
+ bool found = false;
+
+ pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
+ policy->min, policy->max, policy->cpu);
+
+ cpufreq_verify_within_cpu_limits(policy);
+
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;
+
+ if ((freq >= policy->min) && (freq <= policy->max)) {
+ found = true;
+ break;
+ }
+
+ if ((next_larger > freq) && (freq > policy->max))
+ next_larger = freq;
+ }
+
+ if (!found) {
+ policy->max = next_larger;
+ cpufreq_verify_within_cpu_limits(policy);
+ }
+
+ pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
+ policy->min, policy->max, policy->cpu);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
+
+/*
+ * Generic routine to verify policy & frequency table, requires driver to set
+ * policy->freq_table prior to it.
+ */
+int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
+{
+ struct cpufreq_frequency_table *table =
+ cpufreq_frequency_get_table(policy->cpu);
+ if (!table)
+ return -ENODEV;
+
+ return cpufreq_frequency_table_verify(policy, table);
+}
+EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
+
+int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table,
+ unsigned int target_freq,
+ unsigned int relation,
+ unsigned int *index)
+{
+ struct cpufreq_frequency_table optimal = {
+ .driver_data = ~0,
+ .frequency = 0,
+ };
+ struct cpufreq_frequency_table suboptimal = {
+ .driver_data = ~0,
+ .frequency = 0,
+ };
+ struct cpufreq_frequency_table *pos;
+ unsigned int freq, diff, i = 0;
+
+ pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
+ target_freq, relation, policy->cpu);
+
+ switch (relation) {
+ case CPUFREQ_RELATION_H:
+ suboptimal.frequency = ~0;
+ break;
+ case CPUFREQ_RELATION_L:
+ case CPUFREQ_RELATION_C:
+ optimal.frequency = ~0;
+ break;
+ }
+
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;
+
+ i = pos - table;
+ if ((freq < policy->min) || (freq > policy->max))
+ continue;
+ if (freq == target_freq) {
+ optimal.driver_data = i;
+ break;
+ }
+ switch (relation) {
+ case CPUFREQ_RELATION_H:
+ if (freq < target_freq) {
+ if (freq >= optimal.frequency) {
+ optimal.frequency = freq;
+ optimal.driver_data = i;
+ }
+ } else {
+ if (freq <= suboptimal.frequency) {
+ suboptimal.frequency = freq;
+ suboptimal.driver_data = i;
+ }
+ }
+ break;
+ case CPUFREQ_RELATION_L:
+ if (freq > target_freq) {
+ if (freq <= optimal.frequency) {
+ optimal.frequency = freq;
+ optimal.driver_data = i;
+ }
+ } else {
+ if (freq >= suboptimal.frequency) {
+ suboptimal.frequency = freq;
+ suboptimal.driver_data = i;
+ }
+ }
+ break;
+ case CPUFREQ_RELATION_C:
+ diff = abs(freq - target_freq);
+ if (diff < optimal.frequency ||
+ (diff == optimal.frequency &&
+ freq > table[optimal.driver_data].frequency)) {
+ optimal.frequency = diff;
+ optimal.driver_data = i;
+ }
+ break;
+ }
+ }
+ if (optimal.driver_data > i) {
+ if (suboptimal.driver_data > i)
+ return -EINVAL;
+ *index = suboptimal.driver_data;
+ } else
+ *index = optimal.driver_data;
+
+ pr_debug("target index is %u, freq is:%u kHz\n", *index,
+ table[*index].frequency);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
+
+int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
+ unsigned int freq)
+{
+ struct cpufreq_frequency_table *pos, *table;
+
+ table = cpufreq_frequency_get_table(policy->cpu);
+ if (unlikely(!table)) {
+ pr_debug("%s: Unable to find frequency table\n", __func__);
+ return -ENOENT;
+ }
+
+ cpufreq_for_each_valid_entry(pos, table)
+ if (pos->frequency == freq)
+ return pos - table;
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
+
+/**
+ * show_available_freqs - show available frequencies for the specified CPU
+ */
+static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
+ bool show_boost)
+{
+ ssize_t count = 0;
+ struct cpufreq_frequency_table *pos, *table = policy->freq_table;
+
+ if (!table)
+ return -ENODEV;
+
+ cpufreq_for_each_valid_entry(pos, table) {
+ /*
+ * show_boost = true and driver_data = BOOST freq
+ * display BOOST freqs
+ *
+ * show_boost = false and driver_data = BOOST freq
+ * show_boost = true and driver_data != BOOST freq
+ * continue - do not display anything
+ *
+ * show_boost = false and driver_data != BOOST freq
+ * display NON BOOST freqs
+ */
+ if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
+ continue;
+
+ count += sprintf(&buf[count], "%d ", pos->frequency);
+ }
+ count += sprintf(&buf[count], "\n");
+
+ return count;
+
+}
+
+#define cpufreq_attr_available_freq(_name) \
+struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
+__ATTR_RO(_name##_frequencies)
+
+/**
+ * show_scaling_available_frequencies - show available normal frequencies for
+ * the specified CPU
+ */
+static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
+ char *buf)
+{
+ return show_available_freqs(policy, buf, false);
+}
+cpufreq_attr_available_freq(scaling_available);
+EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
+
+/**
+ * show_available_boost_freqs - show available boost frequencies for
+ * the specified CPU
+ */
+static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
+ char *buf)
+{
+ return show_available_freqs(policy, buf, true);
+}
+cpufreq_attr_available_freq(scaling_boost);
+EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
+
+struct freq_attr *cpufreq_generic_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+#ifdef CONFIG_CPU_FREQ_BOOST_SW
+ &cpufreq_freq_attr_scaling_boost_freqs,
+#endif
+ NULL,
+};
+EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
+
+int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ int ret = cpufreq_frequency_table_cpuinfo(policy, table);
+
+ if (!ret)
+ policy->freq_table = table;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
+
+struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
+
+struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
+{
+ struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
+ return policy ? policy->freq_table : NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
+
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION("CPUfreq frequency table helpers");
+MODULE_LICENSE("GPL");