[linux-2.6-block.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                       *
 *********************************************************************/

bool policy_has_boost_freq(struct cpufreq_policy *policy)
{
	struct cpufreq_frequency_table *pos, *table = policy->freq_table;

	if (!table)
		return false;

	cpufreq_for_each_valid_entry(pos, table)
		if (pos->flags & CPUFREQ_BOOST_FREQ)
			return true;

	return false;
}
EXPORT_SYMBOL_GPL(policy_has_boost_freq);

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);

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
44139ed4 VK	21	bool policy_has_boost_freq(struct cpufreq_policy *policy)
	22	{
	23	struct cpufreq_frequency_table pos, table = policy->freq_table;
	24
	25	if (!table)
	26	return false;
	27
	28	cpufreq_for_each_valid_entry(pos, table)
	29	if (pos->flags & CPUFREQ_BOOST_FREQ)
	30	return true;
	31
	32	return false;
	33	}
	34	EXPORT_SYMBOL_GPL(policy_has_boost_freq);
	35
1da177e4 LT	36	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	37	struct cpufreq_frequency_table *table)
	38	{
041526f9	39	struct cpufreq_frequency_table *pos;
1da177e4 LT	40	unsigned int min_freq = ~0;
1da177e4 LT	41	unsigned int max_freq = 0;
041526f9	42	unsigned int freq;
1da177e4	43
041526f9 SK	44	cpufreq_for_each_valid_entry(pos, table) {
041526f9 SK	45	freq = pos->frequency;
1da177e4	46
6f19efc0	47	if (!cpufreq_boost_enabled()
041526f9	48	&& (pos->flags & CPUFREQ_BOOST_FREQ))
6f19efc0 LM	49	continue;
6f19efc0 LM	50
041526f9	51	pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
1da177e4 LT	52	if (freq < min_freq)
	53	min_freq = freq;
	54	if (freq > max_freq)
	55	max_freq = freq;
	56	}
	57
	58	policy->min = policy->cpuinfo.min_freq = min_freq;
	59	policy->max = policy->cpuinfo.max_freq = max_freq;
	60
	61	if (policy->min == ~0)
	62	return -EINVAL;
	63	else
	64	return 0;
	65	}
	66	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
	67
	68
	69	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	70	struct cpufreq_frequency_table *table)
	71	{
041526f9 SK	72	struct cpufreq_frequency_table *pos;
041526f9 SK	73	unsigned int freq, next_larger = ~0;
77db50c4	74	bool found = false;
1da177e4	75
2d06d8c4	76	pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
e08f5f5b	77	policy->min, policy->max, policy->cpu);
1da177e4	78
be49e346	79	cpufreq_verify_within_cpu_limits(policy);
1da177e4	80
041526f9 SK	81	cpufreq_for_each_valid_entry(pos, table) {
	82	freq = pos->frequency;
	83
77db50c4 VK	84	if ((freq >= policy->min) && (freq <= policy->max)) {
	85	found = true;
	86	break;
	87	}
	88
	89	if ((next_larger > freq) && (freq > policy->max))
1da177e4 LT	90	next_larger = freq;
	91	}
	92
77db50c4	93	if (!found) {
1da177e4	94	policy->max = next_larger;
be49e346	95	cpufreq_verify_within_cpu_limits(policy);
77db50c4	96	}
1da177e4	97
2d06d8c4	98	pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
e08f5f5b	99	policy->min, policy->max, policy->cpu);
1da177e4 LT	100
	101	return 0;
	102	}
	103	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
	104
18434512	105	/*
e0b3165b VK	106	* Generic routine to verify policy & frequency table, requires driver to set
e0b3165b VK	107	* policy->freq_table prior to it.
18434512 VK	108	*/
	109	int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
	110	{
	111	struct cpufreq_frequency_table *table =
	112	cpufreq_frequency_get_table(policy->cpu);
	113	if (!table)
	114	return -ENODEV;
	115
	116	return cpufreq_frequency_table_verify(policy, table);
	117	}
	118	EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
1da177e4 LT	119
	120	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	121	struct cpufreq_frequency_table *table,
	122	unsigned int target_freq,
	123	unsigned int relation,
	124	unsigned int *index)
	125	{
484944a5	126	struct cpufreq_frequency_table optimal = {
50701588	127	.driver_data = ~0,
484944a5 DJ	128	.frequency = 0,
	129	};
	130	struct cpufreq_frequency_table suboptimal = {
50701588	131	.driver_data = ~0,
484944a5 DJ	132	.frequency = 0,
484944a5 DJ	133	};
041526f9	134	struct cpufreq_frequency_table *pos;
5b0c0b16	135	unsigned int freq, diff, i = 0;
1da177e4	136
2d06d8c4	137	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
e08f5f5b	138	target_freq, relation, policy->cpu);
1da177e4 LT	139
	140	switch (relation) {
	141	case CPUFREQ_RELATION_H:
1da177e4 LT	142	suboptimal.frequency = ~0;
	143	break;
	144	case CPUFREQ_RELATION_L:
5b0c0b16	145	case CPUFREQ_RELATION_C:
1da177e4	146	optimal.frequency = ~0;
1da177e4 LT	147	break;
	148	}
	149
041526f9 SK	150	cpufreq_for_each_valid_entry(pos, table) {
	151	freq = pos->frequency;
	152
	153	i = pos - table;
1da177e4 LT	154	if ((freq < policy->min) \|\| (freq > policy->max))
1da177e4 LT	155	continue;
1e498856 SK	156	if (freq == target_freq) {
	157	optimal.driver_data = i;
	158	break;
	159	}
97acec55	160	switch (relation) {
1da177e4	161	case CPUFREQ_RELATION_H:
1e498856	162	if (freq < target_freq) {
1da177e4 LT	163	if (freq >= optimal.frequency) {
1da177e4 LT	164	optimal.frequency = freq;
50701588	165	optimal.driver_data = i;
1da177e4 LT	166	}
	167	} else {
	168	if (freq <= suboptimal.frequency) {
	169	suboptimal.frequency = freq;
50701588	170	suboptimal.driver_data = i;
1da177e4 LT	171	}
	172	}
	173	break;
	174	case CPUFREQ_RELATION_L:
1e498856	175	if (freq > target_freq) {
1da177e4 LT	176	if (freq <= optimal.frequency) {
1da177e4 LT	177	optimal.frequency = freq;
50701588	178	optimal.driver_data = i;
1da177e4 LT	179	}
	180	} else {
	181	if (freq >= suboptimal.frequency) {
	182	suboptimal.frequency = freq;
50701588	183	suboptimal.driver_data = i;
1da177e4 LT	184	}
	185	}
	186	break;
5b0c0b16 SK	187	case CPUFREQ_RELATION_C:
	188	diff = abs(freq - target_freq);
	189	if (diff < optimal.frequency \|\|
	190	(diff == optimal.frequency &&
	191	freq > table[optimal.driver_data].frequency)) {
	192	optimal.frequency = diff;
	193	optimal.driver_data = i;
	194	}
	195	break;
1da177e4 LT	196	}
1da177e4 LT	197	}
50701588 VK	198	if (optimal.driver_data > i) {
50701588 VK	199	if (suboptimal.driver_data > i)
1da177e4	200	return -EINVAL;
50701588	201	*index = suboptimal.driver_data;
1da177e4	202	} else
50701588	203	*index = optimal.driver_data;
1da177e4	204
ae87f10f VK	205	pr_debug("target index is %u, freq is:%u kHz\n", *index,
ae87f10f VK	206	table[*index].frequency);
1da177e4 LT	207
	208	return 0;
	209	}
	210	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
	211
d3916691 VK	212	int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
	213	unsigned int freq)
	214	{
041526f9	215	struct cpufreq_frequency_table pos, table;
d3916691 VK	216
	217	table = cpufreq_frequency_get_table(policy->cpu);
	218	if (unlikely(!table)) {
	219	pr_debug("%s: Unable to find frequency table\n", __func__);
	220	return -ENOENT;
	221	}
	222
041526f9 SK	223	cpufreq_for_each_valid_entry(pos, table)
	224	if (pos->frequency == freq)
	225	return pos - table;
d3916691 VK	226
	227	return -EINVAL;
	228	}
	229	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
	230
1da177e4	231	/**
e32d22f7	232	* show_available_freqs - show available frequencies for the specified CPU
1da177e4	233	*/
6f19efc0 LM	234	static ssize_t show_available_freqs(struct cpufreq_policy policy, char buf,
6f19efc0 LM	235	bool show_boost)
1da177e4	236	{
1da177e4	237	ssize_t count = 0;
041526f9	238	struct cpufreq_frequency_table pos, table = policy->freq_table;
1da177e4	239
e0b3165b	240	if (!table)
1da177e4 LT	241	return -ENODEV;
1da177e4 LT	242
041526f9	243	cpufreq_for_each_valid_entry(pos, table) {
6f19efc0 LM	244	/*
	245	* show_boost = true and driver_data = BOOST freq
	246	* display BOOST freqs
	247	*
	248	* show_boost = false and driver_data = BOOST freq
	249	* show_boost = true and driver_data != BOOST freq
	250	* continue - do not display anything
	251	*
	252	* show_boost = false and driver_data != BOOST freq
	253	* display NON BOOST freqs
	254	*/
041526f9	255	if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
6f19efc0 LM	256	continue;
6f19efc0 LM	257
041526f9	258	count += sprintf(&buf[count], "%d ", pos->frequency);
1da177e4 LT	259	}
	260	count += sprintf(&buf[count], "\n");
	261
	262	return count;
	263
	264	}
	265
6f19efc0 LM	266	#define cpufreq_attr_available_freq(_name) \
	267	struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
	268	__ATTR_RO(_name##_frequencies)
	269
	270	/**
	271	* show_scaling_available_frequencies - show available normal frequencies for
	272	* the specified CPU
	273	*/
	274	static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
	275	char *buf)
	276	{
	277	return show_available_freqs(policy, buf, false);
	278	}
	279	cpufreq_attr_available_freq(scaling_available);
1da177e4 LT	280	EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
1da177e4 LT	281
6f19efc0 LM	282	/**
	283	* show_available_boost_freqs - show available boost frequencies for
	284	* the specified CPU
	285	*/
	286	static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
	287	char *buf)
	288	{
	289	return show_available_freqs(policy, buf, true);
	290	}
	291	cpufreq_attr_available_freq(scaling_boost);
	292	EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
	293
18434512 VK	294	struct freq_attr *cpufreq_generic_attr[] = {
18434512 VK	295	&cpufreq_freq_attr_scaling_available_freqs,
6f19efc0 LM	296	#ifdef CONFIG_CPU_FREQ_BOOST_SW
	297	&cpufreq_freq_attr_scaling_boost_freqs,
	298	#endif
18434512 VK	299	NULL,
	300	};
	301	EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
	302
27047a60 VK	303	int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
	304	struct cpufreq_frequency_table *table)
	305	{
	306	int ret = cpufreq_frequency_table_cpuinfo(policy, table);
	307
	308	if (!ret)
e0b3165b	309	policy->freq_table = table;
27047a60 VK	310
	311	return ret;
	312	}
	313	EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
	314
97acec55 DJ	315	MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
	316	MODULE_DESCRIPTION("CPUfreq frequency table helpers");
	317	MODULE_LICENSE("GPL");