[GitHub/mt8127/android_kernel_alcatel_ttab.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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.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 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;

	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 = {
		.index = ~0,
		.frequency = 0,
	};
	struct cpufreq_frequency_table suboptimal = {
		.index = ~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.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;

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

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