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

/*
 * 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;

	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;
	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,
		.frequency = 0,
	};
	struct cpufreq_frequency_table suboptimal = {
		.index = ~0,
		.frequency = 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:
		suboptimal.frequency = ~0;
		break;
	case CPUFREQ_RELATION_L:
		optimal.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 <[email protected]>");
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
	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/cpufreq.h>
	11
	12	#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
	13
	14	/*********************************************************************
	15	* FREQUENCY TABLE HELPERS *
	16	*********************************************************************/
	17
	18	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	19	struct cpufreq_frequency_table *table)
	20	{
	21	unsigned int min_freq = ~0;
	22	unsigned int max_freq = 0;
355eb318	23	unsigned int i;
1da177e4 LT	24
	25	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
	26	unsigned int freq = table[i].frequency;
	27	if (freq == CPUFREQ_ENTRY_INVALID) {
	28	dprintk("table entry %u is invalid, skipping\n", i);
	29
	30	continue;
	31	}
	32	dprintk("table entry %u: %u kHz, %u index\n", i, freq, table[i].index);
	33	if (freq < min_freq)
	34	min_freq = freq;
	35	if (freq > max_freq)
	36	max_freq = freq;
	37	}
	38
	39	policy->min = policy->cpuinfo.min_freq = min_freq;
	40	policy->max = policy->cpuinfo.max_freq = max_freq;
	41
	42	if (policy->min == ~0)
	43	return -EINVAL;
	44	else
	45	return 0;
	46	}
	47	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
	48
	49
	50	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	51	struct cpufreq_frequency_table *table)
	52	{
	53	unsigned int next_larger = ~0;
5557976c	54	unsigned int i;
1da177e4 LT	55	unsigned int count = 0;
	56
	57	dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n", policy->min, policy->max, policy->cpu);
	58
	59	if (!cpu_online(policy->cpu))
	60	return -EINVAL;
	61
32ee8c3e DJ	62	cpufreq_verify_within_limits(policy,
32ee8c3e DJ	63	policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
1da177e4 LT	64
	65	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
	66	unsigned int freq = table[i].frequency;
	67	if (freq == CPUFREQ_ENTRY_INVALID)
	68	continue;
	69	if ((freq >= policy->min) && (freq <= policy->max))
	70	count++;
	71	else if ((next_larger > freq) && (freq > policy->max))
	72	next_larger = freq;
	73	}
	74
	75	if (!count)
	76	policy->max = next_larger;
	77
32ee8c3e DJ	78	cpufreq_verify_within_limits(policy,
32ee8c3e DJ	79	policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
1da177e4 LT	80
	81	dprintk("verification lead to (%u - %u kHz) for cpu %u\n", policy->min, policy->max, policy->cpu);
	82
	83	return 0;
	84	}
	85	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
	86
	87
	88	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	89	struct cpufreq_frequency_table *table,
	90	unsigned int target_freq,
	91	unsigned int relation,
	92	unsigned int *index)
	93	{
484944a5 DJ	94	struct cpufreq_frequency_table optimal = {
	95	.index = ~0,
	96	.frequency = 0,
	97	};
	98	struct cpufreq_frequency_table suboptimal = {
	99	.index = ~0,
	100	.frequency = 0,
	101	};
1da177e4 LT	102	unsigned int i;
	103
	104	dprintk("request for target %u kHz (relation: %u) for cpu %u\n", target_freq, relation, policy->cpu);
	105
	106	switch (relation) {
	107	case CPUFREQ_RELATION_H:
1da177e4 LT	108	suboptimal.frequency = ~0;
	109	break;
	110	case CPUFREQ_RELATION_L:
	111	optimal.frequency = ~0;
1da177e4 LT	112	break;
	113	}
	114
	115	if (!cpu_online(policy->cpu))
	116	return -EINVAL;
	117
	118	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
	119	unsigned int freq = table[i].frequency;
	120	if (freq == CPUFREQ_ENTRY_INVALID)
	121	continue;
	122	if ((freq < policy->min) \|\| (freq > policy->max))
	123	continue;
	124	switch(relation) {
	125	case CPUFREQ_RELATION_H:
	126	if (freq <= target_freq) {
	127	if (freq >= optimal.frequency) {
	128	optimal.frequency = freq;
	129	optimal.index = i;
	130	}
	131	} else {
	132	if (freq <= suboptimal.frequency) {
	133	suboptimal.frequency = freq;
	134	suboptimal.index = i;
	135	}
	136	}
	137	break;
	138	case CPUFREQ_RELATION_L:
	139	if (freq >= target_freq) {
	140	if (freq <= optimal.frequency) {
	141	optimal.frequency = freq;
	142	optimal.index = i;
	143	}
	144	} else {
	145	if (freq >= suboptimal.frequency) {
	146	suboptimal.frequency = freq;
	147	suboptimal.index = i;
	148	}
	149	}
	150	break;
	151	}
	152	}
	153	if (optimal.index > i) {
	154	if (suboptimal.index > i)
	155	return -EINVAL;
	156	*index = suboptimal.index;
	157	} else
	158	*index = optimal.index;
	159
	160	dprintk("target is %u (%u kHz, %u)\n", index, table[index].frequency,
	161	table[*index].index);
	162
	163	return 0;
	164	}
	165	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
	166
	167	static struct cpufreq_frequency_table *show_table[NR_CPUS];
	168	/**
	169	* show_scaling_governor - show the current policy for the specified CPU
	170	*/
	171	static ssize_t show_available_freqs (struct cpufreq_policy policy, char buf)
	172	{
	173	unsigned int i = 0;
	174	unsigned int cpu = policy->cpu;
	175	ssize_t count = 0;
176	struct cpufreq_frequency_table *table;
177
178	if (!show_table[cpu])
179	return -ENODEV;
180
181	table = show_table[cpu];
182
183	for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
184	if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
185	continue;
186	count += sprintf(&buf[count], "%d ", table[i].frequency);
187	}
188	count += sprintf(&buf[count], "\n");
189
190	return count;
191
192	}
193
194	struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
195	.attr = { .name = "scaling_available_frequencies", .mode = 0444, .owner=THIS_MODULE },
196	.show = show_available_freqs,
197	};
198	EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
199
200	/*
201	* if you use these, you must assure that the frequency table is valid
202	* all the time between get_attr and put_attr!
203	*/
32ee8c3e	204	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 LT	205	unsigned int cpu)
	206	{
	207	dprintk("setting show_table for cpu %u to %p\n", cpu, table);
	208	show_table[cpu] = table;
	209	}
	210	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
	211
	212	void cpufreq_frequency_table_put_attr(unsigned int cpu)
	213	{
	214	dprintk("clearing show_table for cpu %u\n", cpu);
	215	show_table[cpu] = NULL;
	216	}
	217	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
	218
	219	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
	220	{
	221	return show_table[cpu];
	222	}
	223	EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
	224
	225	MODULE_AUTHOR ("Dominik Brodowski <[email protected]>");
	226	MODULE_DESCRIPTION ("CPUfreq frequency table helpers");
	227	MODULE_LICENSE ("GPL");