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/* linux/arch/arm/mach-exynos/dynamic-dvfs-nr_running-hotplug.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS4 - Integrated DVFS CPU hotplug
*
* 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.
*/
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include <plat/cpu.h>
static unsigned int total_num_target_freq;
static unsigned int ctn_freq_in_trg_cnt; /* continuous frequency hotplug in trigger count */
static unsigned int ctn_freq_out_trg_cnt; /* continuous frequency hotplug out trigger count */
static unsigned int ctn_nr_running_over2;
static unsigned int ctn_nr_running_over3;
static unsigned int ctn_nr_running_over4;
static unsigned int ctn_nr_running_under2;
static unsigned int ctn_nr_running_under3;
static unsigned int ctn_nr_running_under4;
static unsigned int freq_max; /* max frequency of the dedicated dvfs table */
static unsigned int freq_min = -1UL; /* min frequency of the dedicated dvfs table */
static unsigned int freq_in_trg; /* frequency hotplug in trigger */
static unsigned int freq_out_trg; /* frequency hotplug out trigger */
static unsigned int can_hotplug;
static void exynos4_integrated_dvfs_hotplug(unsigned int freq_old,
unsigned int freq_new)
{
total_num_target_freq++;
freq_in_trg = 800000; /* tunnable */
freq_out_trg = freq_min; /* tunnable */
if (nr_running() <= 1) {
ctn_nr_running_over2 = 0;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2++;
ctn_nr_running_under3++;
ctn_nr_running_under4++;
} else if ((nr_running() > 1) && (nr_running() <= 2)) {
ctn_nr_running_over2++;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3++;
ctn_nr_running_under4++;
} else if ((nr_running() > 2) && (nr_running() <= 3)) {
ctn_nr_running_over2++;
ctn_nr_running_over3++;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4++;
} else if (nr_running() > 3) {
ctn_nr_running_over2++;
ctn_nr_running_over3++;
ctn_nr_running_over4++;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4 = 0;
}
if ((freq_old >= freq_in_trg) && (freq_new >= freq_in_trg))
ctn_freq_in_trg_cnt++;
else
ctn_freq_in_trg_cnt = 0;
if ((freq_old <= freq_out_trg) && (freq_new <= freq_out_trg))
ctn_freq_out_trg_cnt++;
else
ctn_freq_out_trg_cnt = 0;
if (soc_is_exynos4412()) {
if ((cpu_online(3) == 0) && (nr_running() >= 2) &&
((freq_old >= freq_in_trg) && (freq_new >= freq_in_trg))) {
if ((ctn_nr_running_over2 >= 4) &&
(ctn_freq_in_trg_cnt >= 5)) {
/* over 400ms for nr_running(), over 500ms for frequency, tunnable */
cpu_up(3);
ctn_freq_in_trg_cnt = 0;
}
} else if ((cpu_online(2) == 0) && (nr_running() >= 3) &&
((freq_old >= freq_in_trg) && (freq_new >= freq_in_trg))) {
if ((ctn_nr_running_over3 >= 4) &&
(ctn_freq_in_trg_cnt >= 5)) {
/* over 400ms for nr_running(), over 500ms for frequency, tunnable */
cpu_up(2);
ctn_freq_in_trg_cnt = 0;
}
} else if ((cpu_online(1) == 0) && (nr_running() >= 4) &&
((freq_old >= freq_in_trg) && (freq_new >= freq_in_trg))) {
if ((ctn_nr_running_over4 >= 8) &&
(ctn_freq_in_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_up(1);
ctn_freq_in_trg_cnt = 0;
}
}
} else {
if ((cpu_online(1) == 0) && ((freq_old >= freq_in_trg) &&
(freq_new >= freq_in_trg))) {
if ((ctn_nr_running_over2 >= 8) &&
(ctn_freq_in_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_up(1);
ctn_nr_running_over2 = 0;
ctn_freq_in_trg_cnt = 0;
}
}
}
if (soc_is_exynos4412()) {
if ((cpu_online(1) == 1) && (nr_running() < 4) &&
((freq_old <= freq_out_trg) && (freq_new <= freq_out_trg))) {
if ((ctn_nr_running_under4 >= 8) &&
(ctn_freq_out_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_down(1);
ctn_freq_out_trg_cnt = 0;
}
} else if ((cpu_online(2) == 1) && (nr_running() < 3) &&
((freq_old <= freq_out_trg) && (freq_new <= freq_out_trg))) {
if ((ctn_nr_running_under3 >= 8) &&
(ctn_freq_out_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_down(2);
ctn_freq_out_trg_cnt = 0;
}
} else if ((cpu_online(3) == 1) && (nr_running() < 2) &&
((freq_old <= freq_out_trg) && (freq_new <= freq_out_trg))) {
if ((ctn_nr_running_under2 >= 8) &&
(ctn_freq_out_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_down(3);
ctn_freq_out_trg_cnt = 0;
}
}
} else {
if ((cpu_online(1) == 1) &&
((freq_old <= freq_out_trg) && (freq_new <= freq_out_trg))) {
if ((ctn_nr_running_under2 >= 8) &&
(ctn_freq_out_trg_cnt >= 5)) {
/* over 800ms for nr_running(), over 500ms for frequency, tunnable */
cpu_down(1);
ctn_nr_running_under2 = 0;
ctn_freq_out_trg_cnt = 0;
}
}
}
}
static int hotplug_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct cpufreq_freqs *freqs = (struct cpufreq_freqs *)data;
if ((val == CPUFREQ_POSTCHANGE) && can_hotplug)
exynos4_integrated_dvfs_hotplug(freqs->old, freqs->new);
return 0;
}
static struct notifier_block dvfs_hotplug = {
.notifier_call = hotplug_cpufreq_transition,
};
static int hotplug_pm_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
switch (val) {
case PM_SUSPEND_PREPARE:
can_hotplug = 0;
ctn_freq_in_trg_cnt = 0;
ctn_freq_out_trg_cnt = 0;
break;
case PM_POST_RESTORE:
case PM_POST_SUSPEND:
can_hotplug = 1;
break;
}
return 0;
}
static struct notifier_block pm_hotplug = {
.notifier_call = hotplug_pm_transition,
};
/*
* Note : This function should be called after intialization of CPUFreq
* driver for exynos4. The cpufreq_frequency_table for exynos4 should be
* established before calling this function.
*/
static int __init exynos4_integrated_dvfs_hotplug_init(void)
{
int i;
struct cpufreq_frequency_table *table;
unsigned int freq;
total_num_target_freq = 0;
ctn_freq_in_trg_cnt = 0;
ctn_freq_out_trg_cnt = 0;
ctn_nr_running_over2 = 0;
ctn_nr_running_over3 = 0;
ctn_nr_running_over4 = 0;
ctn_nr_running_under2 = 0;
ctn_nr_running_under3 = 0;
ctn_nr_running_under4 = 0;
can_hotplug = 1;
table = cpufreq_frequency_get_table(0);
if (IS_ERR(table)) {
printk(KERN_ERR "%s: Check loading cpufreq before\n", __func__);
return PTR_ERR(table);
}
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
freq = table[i].frequency;
if (freq != CPUFREQ_ENTRY_INVALID && freq > freq_max)
freq_max = freq;
else if (freq != CPUFREQ_ENTRY_INVALID && freq_min > freq)
freq_min = freq;
}
printk(KERN_INFO "%s, max(%d),min(%d)\n", __func__, freq_max, freq_min);
register_pm_notifier(&pm_hotplug);
return cpufreq_register_notifier(&dvfs_hotplug,
CPUFREQ_TRANSITION_NOTIFIER);
}
late_initcall(exynos4_integrated_dvfs_hotplug_init);
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