/*
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* linux/drivers/devfreq/governor_adaptive.c
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*
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* Copyright(c) 2013-2015 Allwinnertech Co., Ltd.
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*
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* Author: Pan Nan <pannan@allwinnertech.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sunxi_dramfreq.h>
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#include "governor.h"
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extern struct sunxi_dramfreq *dramfreq;
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static ssize_t show_pause(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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if (!dramfreq)
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return sprintf(buf, "paras error\n");
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return sprintf(buf, "%u\n", dramfreq->pause);
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}
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static ssize_t store_pause(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int value;
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int ret;
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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ret = -EINVAL;
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goto out;
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}
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ret = kstrtouint(buf, 0, &value);
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if (ret != 0)
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goto out;
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if (value && (!dramfreq->pause))
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dramfreq->governor_state_update(
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dramfreq->devfreq->governor_name, STATE_PAUSE);
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else if ((!value) && dramfreq->pause)
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dramfreq->governor_state_update(
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dramfreq->devfreq->governor_name, STATE_RUNNING);
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ret = count;
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out:
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return ret;
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}
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static DEVICE_ATTR(pause, 0644, show_pause, store_pause);
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static struct attribute *dev_entries[] = {
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&dev_attr_pause.attr,
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NULL,
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};
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static struct attribute_group dev_attr_group = {
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.name = "adaptive",
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.attrs = dev_entries,
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};
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static int devfreq_adaptive_func(struct devfreq *df, unsigned long *freq)
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{
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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return -EINVAL;
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}
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if (!dramfreq->pause) {
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#if defined(CONFIG_ARCH_SUN50IW1) || defined(CONFIG_ARCH_SUN50IW2) || \
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defined(CONFIG_ARCH_SUN8IW11)
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if (dramfreq->key_masters[MASTER_DE] == 0 &&
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dramfreq->key_masters[MASTER_GPU] == 0 &&
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dramfreq->key_masters[MASTER_CSI] == 0) {
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*freq = SUNXI_DRAMFREQ_IDLE;
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} else if (dramfreq->key_masters[MASTER_DE] == 1 &&
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dramfreq->key_masters[MASTER_GPU] == 0 &&
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dramfreq->key_masters[MASTER_CSI] == 0) {
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*freq = SUNXI_DRAMFREQ_NORMAL;
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} else {
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*freq = df->max_freq;
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}
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#elif defined(CONFIG_ARCH_SUN50IW3)
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if (dramfreq->key_masters[MASTER_DE] == 0)
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*freq = SUNXI_DRAMFREQ_IDLE;
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else if (dramfreq->key_masters[MASTER_DE] == 1 &&
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dramfreq->key_masters[MASTER_GPU] == 0 &&
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dramfreq->key_masters[MASTER_VE] == 0)
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*freq = SUNXI_DRAMFREQ_NORMAL;
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else
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*freq = df->max_freq;
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#elif defined(CONFIG_ARCH_SUN8IW10)
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#ifdef CONFIG_EINK_PANEL_USED
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if (dramfreq->key_masters[MASTER_EINK0] == 0
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&& dramfreq->key_masters[MASTER_EDMA] == 0
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&& dramfreq->key_masters[MASTER_EINK1] == 0) {
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*freq = SUNXI_DRAMFREQ_IDLE;
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} else {
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*freq = df->max_freq;
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}
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#else
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if (dramfreq->key_masters[MASTER_DE] == 0 &&
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dramfreq->key_masters[MASTER_CSI] == 0) {
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*freq = SUNXI_DRAMFREQ_IDLE;
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} else if (dramfreq->key_masters[MASTER_DE] == 1 &&
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dramfreq->key_masters[MASTER_CSI] == 0) {
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*freq = SUNXI_DRAMFREQ_NORMAL;
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} else {
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*freq = df->max_freq;
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}
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#endif
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#endif
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} else {
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*freq = df->max_freq;
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}
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return 0;
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}
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static int adaptive_init(struct devfreq *devfreq)
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{
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int ret = 0;
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if (!devfreq)
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return -EINVAL;
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ret = sysfs_create_group(&devfreq->dev.kobj, &dev_attr_group);
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if (ret)
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return ret;
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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return -EINVAL;
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}
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dramfreq->governor_state_update(devfreq->governor_name, STATE_INIT);
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return 0;
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}
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static void adaptive_exit(struct devfreq *devfreq)
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{
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if (!devfreq)
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return;
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sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group);
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if (!dramfreq) {
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pr_err("%s: paras error\n", __func__);
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return;
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}
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dramfreq->governor_state_update(devfreq->governor_name, STATE_EXIT);
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}
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static int devfreq_adaptive_handler(struct devfreq *devfreq,
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unsigned int event, void *data)
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{
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int ret = 0;
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switch (event) {
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case DEVFREQ_GOV_START:
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ret = adaptive_init(devfreq);
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break;
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case DEVFREQ_GOV_STOP:
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adaptive_exit(devfreq);
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break;
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default:
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break;
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}
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return ret;
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}
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static struct devfreq_governor devfreq_adaptive = {
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.name = "adaptive",
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.get_target_freq = devfreq_adaptive_func,
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.event_handler = devfreq_adaptive_handler,
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};
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static int __init devfreq_adaptive_init(void)
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{
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return devfreq_add_governor(&devfreq_adaptive);
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}
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late_initcall(devfreq_adaptive_init);
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static void __exit devfreq_adaptive_exit(void)
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{
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if (devfreq_remove_governor(&devfreq_adaptive))
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pr_err("%s: failed remove governor\n", __func__);
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}
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module_exit(devfreq_adaptive_exit);
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MODULE_LICENSE("GPL");
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