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");