1 files changed, 225 insertions, 0 deletions

diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
new file mode 100644
index 000000000000..ba460bdea60f
--- /dev/null
+++ b/drivers/cpufreq/freq_table.c
@@ -0,0 +1,225 @@
+/*
+ * linux/drivers/cpufreq/freq_table.c
+ *
+ * Copyright (C) 2002 - 2003 Dominik Brodowski
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
+
+/*********************************************************************
+ *                     FREQUENCY TABLE HELPERS                       *
+ *********************************************************************/
+
+int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
+                                    struct cpufreq_frequency_table *table)
+{
+        unsigned int min_freq = ~0;
+        unsigned int max_freq = 0;
+        unsigned int i = 0;
+
+        for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+                unsigned int freq = table[i].frequency;
+                if (freq == CPUFREQ_ENTRY_INVALID) {
+                        dprintk("table entry %u is invalid, skipping\n", i);
+
+                        continue;
+                }
+                dprintk("table entry %u: %u kHz, %u index\n", i, freq, table[i].index);
+                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)
+{
+        unsigned int next_larger = ~0;
+        unsigned int i = 0;
+        unsigned int count = 0;
+
+        dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n", policy->min, policy->max, policy->cpu);
+
+        if (!cpu_online(policy->cpu))
+                return -EINVAL;
+
+        cpufreq_verify_within_limits(policy, 
+                                     policy->cpuinfo.min_freq, 
+                                     policy->cpuinfo.max_freq);
+
+        for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+                unsigned int freq = table[i].frequency;
+                if (freq == CPUFREQ_ENTRY_INVALID)
+                        continue;
+                if ((freq >= policy->min) && (freq <= policy->max))
+                        count++;
+                else if ((next_larger > freq) && (freq > policy->max))
+                        next_larger = freq;
+        }
+
+        if (!count)
+                policy->max = next_larger;
+
+        cpufreq_verify_within_limits(policy, 
+                                     policy->cpuinfo.min_freq, 
+                                     policy->cpuinfo.max_freq);
+
+        dprintk("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);
+
+
+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 = { .index = ~0, };
+        struct cpufreq_frequency_table suboptimal = { .index = ~0, };
+        unsigned int i;
+
+        dprintk("request for target %u kHz (relation: %u) for cpu %u\n", target_freq, relation, policy->cpu);
+
+        switch (relation) {
+        case CPUFREQ_RELATION_H:
+                optimal.frequency = 0;
+                suboptimal.frequency = ~0;
+                break;
+        case CPUFREQ_RELATION_L:
+                optimal.frequency = ~0;
+                suboptimal.frequency = 0;
+                break;
+        }
+
+        if (!cpu_online(policy->cpu))
+                return -EINVAL;
+
+        for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+                unsigned int freq = table[i].frequency;
+                if (freq == CPUFREQ_ENTRY_INVALID)
+                        continue;
+                if ((freq < policy->min) || (freq > policy->max))
+                        continue;
+                switch(relation) {
+                case CPUFREQ_RELATION_H:
+                        if (freq <= target_freq) {
+                                if (freq >= optimal.frequency) {
+                                        optimal.frequency = freq;
+                                        optimal.index = i;
+                                }
+                        } else {
+                                if (freq <= suboptimal.frequency) {
+                                        suboptimal.frequency = freq;
+                                        suboptimal.index = i;
+                                }
+                        }
+                        break;
+                case CPUFREQ_RELATION_L:
+                        if (freq >= target_freq) {
+                                if (freq <= optimal.frequency) {
+                                        optimal.frequency = freq;
+                                        optimal.index = i;
+                                }
+                        } else {
+                                if (freq >= suboptimal.frequency) {
+                                        suboptimal.frequency = freq;
+                                        suboptimal.index = i;
+                                }
+                        }
+                        break;
+                }
+        }
+        if (optimal.index > i) {
+                if (suboptimal.index > i)
+                        return -EINVAL;
+                *index = suboptimal.index;
+        } else
+                *index = optimal.index;
+
+        dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
+                table[*index].index);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
+
+static struct cpufreq_frequency_table *show_table[NR_CPUS];
+/**
+ * show_scaling_governor - show the current policy for the specified CPU
+ */
+static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
+{
+        unsigned int i = 0;
+        unsigned int cpu = policy->cpu;
+        ssize_t count = 0;
+        struct cpufreq_frequency_table *table;
+
+        if (!show_table[cpu])
+                return -ENODEV;
+
+        table = show_table[cpu];
+
+        for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+                if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+                        continue;
+                count += sprintf(&buf[count], "%d ", table[i].frequency);
+        }
+        count += sprintf(&buf[count], "\n");
+
+        return count;
+
+}
+
+struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
+        .attr = { .name = "scaling_available_frequencies", .mode = 0444, .owner=THIS_MODULE },
+        .show = show_available_freqs,
+};
+EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
+
+/*
+ * if you use these, you must assure that the frequency table is valid
+ * all the time between get_attr and put_attr!
+ */
+void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, 
+                                      unsigned int cpu)
+{
+        dprintk("setting show_table for cpu %u to %p\n", cpu, table);
+        show_table[cpu] = table;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
+
+void cpufreq_frequency_table_put_attr(unsigned int cpu)
+{
+        dprintk("clearing show_table for cpu %u\n", cpu);
+        show_table[cpu] = NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
+
+struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
+{
+        return show_table[cpu];
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
+
+MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION ("CPUfreq frequency table helpers");
+MODULE_LICENSE ("GPL");