[deliverable/linux.git] / drivers / cpufreq / freq_table.c

/*
 * 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)
{
	unsigned int min_freq = ~0;
	unsigned int max_freq = 0;
	unsigned int i;

	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
		unsigned int freq = table[i].frequency;
		if (freq == CPUFREQ_ENTRY_INVALID) {
			pr_debug("table entry %u is invalid, skipping\n", i);

			continue;
		}
		pr_debug("table entry %u: %u kHz, %u driver_data\n",
					i, freq, table[i].driver_data);
		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;
	unsigned int count = 0;

	pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
					policy->min, policy->max, policy->cpu);

	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);

	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);


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,
	};
	unsigned int i;

	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:
		optimal.frequency = ~0;
		break;
	}

	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.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;
		}
	}
	if (optimal.driver_data > i) {
		if (suboptimal.driver_data > i)
			return -EINVAL;
		*index = suboptimal.driver_data;
	} else
		*index = optimal.driver_data;

	pr_debug("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
		table[*index].driver_data);

	return 0;
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);

static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
/**
 * show_available_freqs - show available frequencies 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 (!per_cpu(cpufreq_show_table, cpu))
		return -ENODEV;

	table = per_cpu(cpufreq_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,
		},
	.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)
{
	pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
	per_cpu(cpufreq_show_table, cpu) = table;
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);

void cpufreq_frequency_table_put_attr(unsigned int cpu)
{
	pr_debug("clearing show_table for cpu %u\n", cpu);
	per_cpu(cpufreq_show_table, cpu) = NULL;
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);

void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy)
{
	pr_debug("Updating show_table for new_cpu %u from last_cpu %u\n",
			policy->cpu, policy->last_cpu);
	per_cpu(cpufreq_show_table, policy->cpu) = per_cpu(cpufreq_show_table,
			policy->last_cpu);
	per_cpu(cpufreq_show_table, policy->last_cpu) = NULL;
}

struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
{
	return per_cpu(cpufreq_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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/cpufreq/freq_table.c
	3	*
	4	* Copyright (C) 2002 - 2003 Dominik Brodowski
4f743694 DB	5	*
	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.
	9	*
1da177e4 LT	10	*/
1da177e4 LT	11
db701151 VK	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
db701151 VK	13
1da177e4	14	#include <linux/cpufreq.h>
5ff0a268	15	#include <linux/module.h>
1da177e4	16
1da177e4 LT	17	/*********************************************************************
	18	* FREQUENCY TABLE HELPERS *
	19	*********************************************************************/
	20
	21	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	22	struct cpufreq_frequency_table *table)
	23	{
	24	unsigned int min_freq = ~0;
	25	unsigned int max_freq = 0;
355eb318	26	unsigned int i;
1da177e4	27
97acec55	28	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	29	unsigned int freq = table[i].frequency;
1da177e4 LT	30	if (freq == CPUFREQ_ENTRY_INVALID) {
2d06d8c4	31	pr_debug("table entry %u is invalid, skipping\n", i);
1da177e4 LT	32
	33	continue;
	34	}
50701588 VK	35	pr_debug("table entry %u: %u kHz, %u driver_data\n",
50701588 VK	36	i, freq, table[i].driver_data);
1da177e4 LT	37	if (freq < min_freq)
	38	min_freq = freq;
	39	if (freq > max_freq)
	40	max_freq = freq;
	41	}
	42
	43	policy->min = policy->cpuinfo.min_freq = min_freq;
	44	policy->max = policy->cpuinfo.max_freq = max_freq;
	45
	46	if (policy->min == ~0)
	47	return -EINVAL;
	48	else
	49	return 0;
	50	}
	51	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
	52
	53
	54	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	55	struct cpufreq_frequency_table *table)
	56	{
	57	unsigned int next_larger = ~0;
5557976c	58	unsigned int i;
1da177e4 LT	59	unsigned int count = 0;
1da177e4 LT	60
2d06d8c4	61	pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
e08f5f5b	62	policy->min, policy->max, policy->cpu);
1da177e4	63
e08f5f5b GS	64	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
e08f5f5b GS	65	policy->cpuinfo.max_freq);
1da177e4	66
97acec55	67	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	68	unsigned int freq = table[i].frequency;
	69	if (freq == CPUFREQ_ENTRY_INVALID)
	70	continue;
	71	if ((freq >= policy->min) && (freq <= policy->max))
	72	count++;
	73	else if ((next_larger > freq) && (freq > policy->max))
	74	next_larger = freq;
	75	}
	76
	77	if (!count)
	78	policy->max = next_larger;
	79
e08f5f5b GS	80	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
e08f5f5b GS	81	policy->cpuinfo.max_freq);
1da177e4	82
2d06d8c4	83	pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
e08f5f5b	84	policy->min, policy->max, policy->cpu);
1da177e4 LT	85
	86	return 0;
	87	}
	88	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
	89
	90
	91	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	92	struct cpufreq_frequency_table *table,
	93	unsigned int target_freq,
	94	unsigned int relation,
	95	unsigned int *index)
	96	{
484944a5	97	struct cpufreq_frequency_table optimal = {
50701588	98	.driver_data = ~0,
484944a5 DJ	99	.frequency = 0,
	100	};
	101	struct cpufreq_frequency_table suboptimal = {
50701588	102	.driver_data = ~0,
484944a5 DJ	103	.frequency = 0,
484944a5 DJ	104	};
1da177e4 LT	105	unsigned int i;
1da177e4 LT	106
2d06d8c4	107	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
e08f5f5b	108	target_freq, relation, policy->cpu);
1da177e4 LT	109
	110	switch (relation) {
	111	case CPUFREQ_RELATION_H:
1da177e4 LT	112	suboptimal.frequency = ~0;
	113	break;
	114	case CPUFREQ_RELATION_L:
	115	optimal.frequency = ~0;
1da177e4 LT	116	break;
	117	}
	118
97acec55	119	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	120	unsigned int freq = table[i].frequency;
	121	if (freq == CPUFREQ_ENTRY_INVALID)
	122	continue;
	123	if ((freq < policy->min) \|\| (freq > policy->max))
	124	continue;
97acec55	125	switch (relation) {
1da177e4 LT	126	case CPUFREQ_RELATION_H:
	127	if (freq <= target_freq) {
	128	if (freq >= optimal.frequency) {
	129	optimal.frequency = freq;
50701588	130	optimal.driver_data = i;
1da177e4 LT	131	}
	132	} else {
	133	if (freq <= suboptimal.frequency) {
	134	suboptimal.frequency = freq;
50701588	135	suboptimal.driver_data = i;
1da177e4 LT	136	}
	137	}
	138	break;
	139	case CPUFREQ_RELATION_L:
	140	if (freq >= target_freq) {
	141	if (freq <= optimal.frequency) {
	142	optimal.frequency = freq;
50701588	143	optimal.driver_data = i;
1da177e4 LT	144	}
	145	} else {
	146	if (freq >= suboptimal.frequency) {
	147	suboptimal.frequency = freq;
50701588	148	suboptimal.driver_data = i;
1da177e4 LT	149	}
	150	}
	151	break;
	152	}
	153	}
50701588 VK	154	if (optimal.driver_data > i) {
50701588 VK	155	if (suboptimal.driver_data > i)
1da177e4	156	return -EINVAL;
50701588	157	*index = suboptimal.driver_data;
1da177e4	158	} else
50701588	159	*index = optimal.driver_data;
1da177e4	160
2d06d8c4	161	pr_debug("target is %u (%u kHz, %u)\n", index, table[index].frequency,
50701588	162	table[*index].driver_data);
1da177e4 LT	163
	164	return 0;
	165	}
	166	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
	167
f1625066	168	static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
1da177e4	169	/**
e32d22f7	170	* show_available_freqs - show available frequencies for the specified CPU
1da177e4	171	*/
97acec55	172	static ssize_t show_available_freqs(struct cpufreq_policy policy, char buf)
1da177e4 LT	173	{
	174	unsigned int i = 0;
	175	unsigned int cpu = policy->cpu;
	176	ssize_t count = 0;
	177	struct cpufreq_frequency_table *table;
	178
f1625066	179	if (!per_cpu(cpufreq_show_table, cpu))
1da177e4 LT	180	return -ENODEV;
1da177e4 LT	181
f1625066	182	table = per_cpu(cpufreq_show_table, cpu);
1da177e4	183
97acec55	184	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	185	if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
	186	continue;
	187	count += sprintf(&buf[count], "%d ", table[i].frequency);
	188	}
	189	count += sprintf(&buf[count], "\n");
	190
	191	return count;
	192
	193	}
	194
	195	struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
e08f5f5b GS	196	.attr = { .name = "scaling_available_frequencies",
e08f5f5b GS	197	.mode = 0444,
e08f5f5b	198	},
1da177e4 LT	199	.show = show_available_freqs,
	200	};
	201	EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
	202
	203	/*
	204	* if you use these, you must assure that the frequency table is valid
	205	* all the time between get_attr and put_attr!
	206	*/
32ee8c3e	207	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 LT	208	unsigned int cpu)
1da177e4 LT	209	{
2d06d8c4	210	pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
f1625066	211	per_cpu(cpufreq_show_table, cpu) = table;
1da177e4 LT	212	}
	213	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
	214
	215	void cpufreq_frequency_table_put_attr(unsigned int cpu)
	216	{
2d06d8c4	217	pr_debug("clearing show_table for cpu %u\n", cpu);
f1625066	218	per_cpu(cpufreq_show_table, cpu) = NULL;
1da177e4 LT	219	}
	220	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
	221
b8eed8af VK	222	void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy)
	223	{
	224	pr_debug("Updating show_table for new_cpu %u from last_cpu %u\n",
	225	policy->cpu, policy->last_cpu);
	226	per_cpu(cpufreq_show_table, policy->cpu) = per_cpu(cpufreq_show_table,
	227	policy->last_cpu);
	228	per_cpu(cpufreq_show_table, policy->last_cpu) = NULL;
	229	}
	230
1da177e4 LT	231	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
1da177e4 LT	232	{
f1625066	233	return per_cpu(cpufreq_show_table, cpu);
1da177e4 LT	234	}
	235	EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
	236
97acec55 DJ	237	MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
	238	MODULE_DESCRIPTION("CPUfreq frequency table helpers");
	239	MODULE_LICENSE("GPL");