[GitHub/LineageOS/android_kernel_samsung_universal7580.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, freq, i = 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_limits(policy, policy->cpuinfo.min_freq,
				     policy->cpuinfo.max_freq);

	for (; freq = table[i].frequency, freq != CPUFREQ_TABLE_END; i++) {
		if (freq == CPUFREQ_ENTRY_INVALID)
			continue;
		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_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, diff;


	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;
	}

	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;
		case CPUFREQ_RELATION_C:
			diff = abs(freq - target_freq);
			if (diff < optimal.frequency ||
				(diff == optimal.frequency &&
				 freq > table[optimal.index].frequency)) {
				optimal.frequency = diff;
				optimal.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	{
44d69320 VK	59	unsigned int next_larger = ~0, freq, i = 0;
44d69320 VK	60	bool found = false;
1da177e4	61
2d06d8c4	62	pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
e08f5f5b	63	policy->min, policy->max, policy->cpu);
1da177e4	64
e08f5f5b GS	65	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
e08f5f5b GS	66	policy->cpuinfo.max_freq);
1da177e4	67
44d69320	68	for (; freq = table[i].frequency, freq != CPUFREQ_TABLE_END; i++) {
1da177e4 LT	69	if (freq == CPUFREQ_ENTRY_INVALID)
1da177e4 LT	70	continue;
44d69320 VK	71	if ((freq >= policy->min) && (freq <= policy->max)) {
	72	found = true;
	73	break;
	74	}
	75
	76	if ((next_larger > freq) && (freq > policy->max))
1da177e4 LT	77	next_larger = freq;
	78	}
	79
44d69320	80	if (!found) {
1da177e4	81	policy->max = next_larger;
44d69320 VK	82	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
	83	policy->cpuinfo.max_freq);
	84	}
1da177e4	85
2d06d8c4	86	pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
e08f5f5b	87	policy->min, policy->max, policy->cpu);
1da177e4 LT	88
	89	return 0;
	90	}
	91	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
	92
	93
	94	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	95	struct cpufreq_frequency_table *table,
	96	unsigned int target_freq,
	97	unsigned int relation,
	98	unsigned int *index)
	99	{
484944a5 DJ	100	struct cpufreq_frequency_table optimal = {
	101	.index = ~0,
	102	.frequency = 0,
	103	};
	104	struct cpufreq_frequency_table suboptimal = {
	105	.index = ~0,
	106	.frequency = 0,
	107	};
c8354165	108	unsigned int i, diff;
c8354165	109
1da177e4	110
2d06d8c4	111	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
e08f5f5b	112	target_freq, relation, policy->cpu);
1da177e4 LT	113
	114	switch (relation) {
	115	case CPUFREQ_RELATION_H:
1da177e4 LT	116	suboptimal.frequency = ~0;
	117	break;
	118	case CPUFREQ_RELATION_L:
c8354165	119	case CPUFREQ_RELATION_C:
1da177e4	120	optimal.frequency = ~0;
1da177e4 LT	121	break;
	122	}
	123
97acec55	124	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	125	unsigned int freq = table[i].frequency;
	126	if (freq == CPUFREQ_ENTRY_INVALID)
	127	continue;
	128	if ((freq < policy->min) \|\| (freq > policy->max))
	129	continue;
97acec55	130	switch (relation) {
1da177e4 LT	131	case CPUFREQ_RELATION_H:
	132	if (freq <= target_freq) {
	133	if (freq >= optimal.frequency) {
	134	optimal.frequency = freq;
	135	optimal.index = i;
	136	}
	137	} else {
	138	if (freq <= suboptimal.frequency) {
	139	suboptimal.frequency = freq;
	140	suboptimal.index = i;
	141	}
	142	}
	143	break;
	144	case CPUFREQ_RELATION_L:
	145	if (freq >= target_freq) {
	146	if (freq <= optimal.frequency) {
	147	optimal.frequency = freq;
	148	optimal.index = i;
	149	}
	150	} else {
	151	if (freq >= suboptimal.frequency) {
	152	suboptimal.frequency = freq;
	153	suboptimal.index = i;
	154	}
	155	}
	156	break;
c8354165	157	case CPUFREQ_RELATION_C:
	158	diff = abs(freq - target_freq);
	159	if (diff < optimal.frequency \|\|
	160	(diff == optimal.frequency &&
	161	freq > table[optimal.index].frequency)) {
	162	optimal.frequency = diff;
	163	optimal.index = i;
	164	}
	165	break;
1da177e4 LT	166	}
	167	}
	168	if (optimal.index > i) {
	169	if (suboptimal.index > i)
	170	return -EINVAL;
	171	*index = suboptimal.index;
	172	} else
	173	*index = optimal.index;
	174
2d06d8c4	175	pr_debug("target is %u (%u kHz, %u)\n", index, table[index].frequency,
1da177e4 LT	176	table[*index].index);
	177
	178	return 0;
	179	}
	180	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
	181
f1625066	182	static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
1da177e4	183	/**
e32d22f7	184	* show_available_freqs - show available frequencies for the specified CPU
1da177e4	185	*/
97acec55	186	static ssize_t show_available_freqs(struct cpufreq_policy policy, char buf)
1da177e4 LT	187	{
	188	unsigned int i = 0;
	189	unsigned int cpu = policy->cpu;
	190	ssize_t count = 0;
	191	struct cpufreq_frequency_table *table;
	192
f1625066	193	if (!per_cpu(cpufreq_show_table, cpu))
1da177e4 LT	194	return -ENODEV;
1da177e4 LT	195
f1625066	196	table = per_cpu(cpufreq_show_table, cpu);
1da177e4	197
97acec55	198	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
1da177e4 LT	199	if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
	200	continue;
	201	count += sprintf(&buf[count], "%d ", table[i].frequency);
	202	}
	203	count += sprintf(&buf[count], "\n");
	204
	205	return count;
	206
	207	}
	208
	209	struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
e08f5f5b GS	210	.attr = { .name = "scaling_available_frequencies",
e08f5f5b GS	211	.mode = 0444,
e08f5f5b	212	},
1da177e4 LT	213	.show = show_available_freqs,
	214	};
	215	EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
	216
	217	/*
	218	* if you use these, you must assure that the frequency table is valid
	219	* all the time between get_attr and put_attr!
	220	*/
32ee8c3e	221	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 LT	222	unsigned int cpu)
1da177e4 LT	223	{
2d06d8c4	224	pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
f1625066	225	per_cpu(cpufreq_show_table, cpu) = table;
1da177e4 LT	226	}
	227	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
	228
	229	void cpufreq_frequency_table_put_attr(unsigned int cpu)
	230	{
2d06d8c4	231	pr_debug("clearing show_table for cpu %u\n", cpu);
f1625066	232	per_cpu(cpufreq_show_table, cpu) = NULL;
1da177e4 LT	233	}
	234	EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
	235
b8eed8af VK	236	void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy)
	237	{
	238	pr_debug("Updating show_table for new_cpu %u from last_cpu %u\n",
	239	policy->cpu, policy->last_cpu);
	240	per_cpu(cpufreq_show_table, policy->cpu) = per_cpu(cpufreq_show_table,
	241	policy->last_cpu);
	242	per_cpu(cpufreq_show_table, policy->last_cpu) = NULL;
	243	}
	244
1da177e4 LT	245	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
1da177e4 LT	246	{
f1625066	247	return per_cpu(cpufreq_show_table, cpu);
1da177e4 LT	248	}
	249	EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
	250
97acec55 DJ	251	MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
	252	MODULE_DESCRIPTION("CPUfreq frequency table helpers");
	253	MODULE_LICENSE("GPL");