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/*
* Copyright (C) 2012 Texas Instruments, Inc
*
* 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.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/sysfs.h>
#include "sgxfreq.h"
static int userspace_start(struct sgxfreq_sgx_data *data);
static void userspace_stop(void);
static void userspace_sgx_clk_on(void);
static void userspace_sgx_clk_off(void);
static void userspace_sgx_active(void);
static void userspace_sgx_idle(void);
static struct sgxfreq_governor userspace_gov = {
.name = "userspace",
.gov_start = userspace_start,
.gov_stop = userspace_stop,
.sgx_clk_on = userspace_sgx_clk_on,
.sgx_clk_off = userspace_sgx_clk_off,
.sgx_active = userspace_sgx_active,
.sgx_idle = userspace_sgx_idle,
};
static struct userspace_data {
unsigned long freq_user; /* in KHz */
struct mutex mutex;
} usd;
/*********************** begin sysfs interface ***********************/
extern struct kobject *sgxfreq_kobj;
static ssize_t show_frequency_set(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", usd.freq_user);
}
static ssize_t store_frequency_set(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret;
unsigned long freq;
ret = sscanf(buf, "%lu", &freq);
if (ret != 1)
return -EINVAL;
mutex_lock(&odd.mutex);
if (freq > sgxfreq_get_freq_max())
freq = sgxfreq_get_freq_max();
usd.freq_user = sgxfreq_set_freq_request(freq);
trace_printk("USERSPACE: new freq=%luHz.\n", usd.freq_user);
mutex_unlock(&odd.mutex);
return count;
}
static DEVICE_ATTR(frequency_set, 0644,
show_frequency_set, store_frequency_set);
static struct attribute *userspace_attributes[] = {
&dev_attr_frequency_set.attr,
NULL
};
static struct attribute_group userspace_attr_group = {
.attrs = userspace_attributes,
.name = "userspace",
};
/************************ end sysfs interface ************************/
int userspace_init(void)
{
int ret;
mutex_init(&odd.mutex);
ret = sgxfreq_register_governor(&userspace_gov);
if (ret)
return ret;
return 0;
}
int userspace_deinit(void)
{
return 0;
}
static int userspace_start(struct sgxfreq_sgx_data *data)
{
int ret;
usd.freq_user = sgxfreq_get_freq();
ret = sysfs_create_group(sgxfreq_kobj, &userspace_attr_group);
if (ret)
return ret;
trace_printk("USERSPACE: started.\n");
return 0;
}
static void userspace_stop(void)
{
usd.freq_user = sgxfreq_set_freq_request(sgxfreq_get_freq_min());
sysfs_remove_group(sgxfreq_kobj, &userspace_attr_group);
trace_printk("USERSPACE: stopped.\n");
}
static void userspace_sgx_clk_on(void)
{
mutex_lock(&ood.mutex);
sgxfreq_set_freq_request(usd.freq_user);
mutex_unlock(&ood.mutex);
}
static void userspace_sgx_clk_off(void)
{
mutex_lock(&ood.mutex);
sgxfreq_set_freq_request(sgxfreq_get_freq_min());
mutex_unlock(&ood.mutex);
}
static void userspace_sgx_active(void)
{
mutex_lock(&aid.mutex);
sgxfreq_set_freq_request(usd.freq_user);
mutex_unlock(&aid.mutex);
}
static void userspace_sgx_idle(void)
{
mutex_lock(&aid.mutex);
sgxfreq_set_freq_request(sgxfreq_get_freq_min());
mutex_unlock(&aid.mutex);
}
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