396 lines
10 KiB
C
396 lines
10 KiB
C
/*
|
|
* OMAP thermal driver interface
|
|
*
|
|
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Contact:
|
|
* Eduardo Valentin <eduardo.valentin@ti.com>
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/thermal.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/cpu_cooling.h>
|
|
|
|
#include "omap-thermal.h"
|
|
#include "omap-bandgap.h"
|
|
|
|
/* common data structures */
|
|
struct omap_thermal_data {
|
|
struct thermal_zone_device *omap_thermal;
|
|
struct thermal_cooling_device *cool_dev;
|
|
struct omap_bandgap *bg_ptr;
|
|
enum thermal_device_mode mode;
|
|
struct work_struct thermal_wq;
|
|
int sensor_id;
|
|
};
|
|
|
|
static void omap_thermal_work(struct work_struct *work)
|
|
{
|
|
struct omap_thermal_data *data = container_of(work,
|
|
struct omap_thermal_data, thermal_wq);
|
|
|
|
thermal_zone_device_update(data->omap_thermal);
|
|
|
|
dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
|
|
data->omap_thermal->type);
|
|
}
|
|
|
|
/**
|
|
* omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
|
|
* @t: omap sensor temperature
|
|
* @s: omap sensor slope value
|
|
* @c: omap sensor const value
|
|
*/
|
|
static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
|
|
{
|
|
int delta = t * s / 1000 + c;
|
|
|
|
if (delta < 0)
|
|
delta = 0;
|
|
|
|
return t + delta;
|
|
}
|
|
|
|
/* thermal zone ops */
|
|
/* Get temperature callback function for thermal zone*/
|
|
static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
|
|
unsigned long *temp)
|
|
{
|
|
struct omap_thermal_data *data = thermal->devdata;
|
|
struct omap_bandgap *bg_ptr;
|
|
struct omap_temp_sensor *s;
|
|
int ret, tmp, pcb_temp, slope, constant;
|
|
|
|
if (!data)
|
|
return 0;
|
|
|
|
bg_ptr = data->bg_ptr;
|
|
s = &bg_ptr->conf->sensors[data->sensor_id];
|
|
|
|
ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pcb_temp = 0;
|
|
/* TODO: Introduce pcb temperature lookup */
|
|
/* In case pcb zone is available, use the extrapolation rule with it */
|
|
if (pcb_temp) {
|
|
tmp -= pcb_temp;
|
|
slope = s->slope_pcb;
|
|
constant = s->constant_pcb;
|
|
} else {
|
|
slope = s->slope;
|
|
constant = s->constant;
|
|
}
|
|
*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Bind callback functions for thermal zone */
|
|
static int omap_thermal_bind(struct thermal_zone_device *thermal,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct omap_thermal_data *data = thermal->devdata;
|
|
int max, id;
|
|
|
|
if (IS_ERR_OR_NULL(data))
|
|
return -ENODEV;
|
|
|
|
/* check if this is the cooling device we registered */
|
|
if (data->cool_dev != cdev)
|
|
return 0;
|
|
|
|
id = data->sensor_id;
|
|
max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;
|
|
|
|
/* TODO: bind with min and max states */
|
|
/* Simple thing, two trips, one passive another critical */
|
|
return thermal_zone_bind_cooling_device(thermal, 0, cdev,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_NO_LIMIT);
|
|
}
|
|
|
|
/* Unbind callback functions for thermal zone */
|
|
static int omap_thermal_unbind(struct thermal_zone_device *thermal,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct omap_thermal_data *data = thermal->devdata;
|
|
|
|
if (IS_ERR_OR_NULL(data))
|
|
return -ENODEV;
|
|
|
|
/* check if this is the cooling device we registered */
|
|
if (data->cool_dev != cdev)
|
|
return 0;
|
|
|
|
/* Simple thing, two trips, one passive another critical */
|
|
return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
|
|
}
|
|
|
|
/* Get mode callback functions for thermal zone */
|
|
static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
|
|
enum thermal_device_mode *mode)
|
|
{
|
|
struct omap_thermal_data *data = thermal->devdata;
|
|
|
|
if (data)
|
|
*mode = data->mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set mode callback functions for thermal zone */
|
|
static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
|
|
enum thermal_device_mode mode)
|
|
{
|
|
struct omap_thermal_data *data = thermal->devdata;
|
|
|
|
if (!data->omap_thermal) {
|
|
dev_notice(&thermal->device, "thermal zone not registered\n");
|
|
return 0;
|
|
}
|
|
|
|
mutex_lock(&data->omap_thermal->lock);
|
|
|
|
if (mode == THERMAL_DEVICE_ENABLED)
|
|
data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
|
|
else
|
|
data->omap_thermal->polling_delay = 0;
|
|
|
|
mutex_unlock(&data->omap_thermal->lock);
|
|
|
|
data->mode = mode;
|
|
thermal_zone_device_update(data->omap_thermal);
|
|
dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
|
|
data->omap_thermal->polling_delay);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get trip type callback functions for thermal zone */
|
|
static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
|
|
int trip, enum thermal_trip_type *type)
|
|
{
|
|
if (!omap_thermal_is_valid_trip(trip))
|
|
return -EINVAL;
|
|
|
|
if (trip + 1 == OMAP_TRIP_NUMBER)
|
|
*type = THERMAL_TRIP_CRITICAL;
|
|
else
|
|
*type = THERMAL_TRIP_PASSIVE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get trip temperature callback functions for thermal zone */
|
|
static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
|
|
int trip, unsigned long *temp)
|
|
{
|
|
if (!omap_thermal_is_valid_trip(trip))
|
|
return -EINVAL;
|
|
|
|
*temp = omap_thermal_get_trip_value(trip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get critical temperature callback functions for thermal zone */
|
|
static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
|
|
unsigned long *temp)
|
|
{
|
|
/* shutdown zone */
|
|
return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
|
|
}
|
|
|
|
static struct thermal_zone_device_ops omap_thermal_ops = {
|
|
.get_temp = omap_thermal_get_temp,
|
|
/* TODO: add .get_trend */
|
|
.bind = omap_thermal_bind,
|
|
.unbind = omap_thermal_unbind,
|
|
.get_mode = omap_thermal_get_mode,
|
|
.set_mode = omap_thermal_set_mode,
|
|
.get_trip_type = omap_thermal_get_trip_type,
|
|
.get_trip_temp = omap_thermal_get_trip_temp,
|
|
.get_crit_temp = omap_thermal_get_crit_temp,
|
|
};
|
|
|
|
static struct omap_thermal_data
|
|
*omap_thermal_build_data(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct omap_thermal_data *data;
|
|
|
|
data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data) {
|
|
dev_err(bg_ptr->dev, "kzalloc fail\n");
|
|
return NULL;
|
|
}
|
|
data->sensor_id = id;
|
|
data->bg_ptr = bg_ptr;
|
|
data->mode = THERMAL_DEVICE_ENABLED;
|
|
INIT_WORK(&data->thermal_wq, omap_thermal_work);
|
|
|
|
return data;
|
|
}
|
|
|
|
int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
|
|
char *domain)
|
|
{
|
|
struct omap_thermal_pdata pdata;
|
|
|
|
data = omap_bandgap_get_sensor_data(bg_ptr, id);
|
|
|
|
if (!data)
|
|
data = omap_thermal_build_pdata(bg_ptr, id);
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
/* TODO: remove TC1 TC2 */
|
|
/* Create thermal zone */
|
|
data->omap_thermal = thermal_zone_device_register(domain,
|
|
OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
|
|
FAST_TEMP_MONITORING_RATE,
|
|
FAST_TEMP_MONITORING_RATE);
|
|
if (IS_ERR_OR_NULL(data->omap_thermal)) {
|
|
dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
|
|
return PTR_ERR(data->omap_thermal);
|
|
}
|
|
data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
|
|
omap_bandgap_set_sensor_data(bg_ptr, id, data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct omap_thermal_data *data;
|
|
|
|
data = omap_bandgap_get_sensor_data(bg_ptr, id);
|
|
|
|
thermal_zone_device_unregister(data->omap_thermal);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct omap_thermal_data *data;
|
|
|
|
data = omap_bandgap_get_sensor_data(bg_ptr, id);
|
|
|
|
schedule_work(&data->thermal_wq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
|
|
struct freq_clip_table **tab_ptr,
|
|
int *tab_size)
|
|
{
|
|
struct cpufreq_frequency_table *freq_table;
|
|
struct freq_clip_table *tab;
|
|
int i, count = 0;
|
|
|
|
freq_table = cpufreq_frequency_get_table(0);
|
|
if (IS_ERR_OR_NULL(freq_table)) {
|
|
dev_err(bg_ptr->dev,
|
|
"%s: failed to get cpufreq table (%p)\n",
|
|
__func__, freq_table);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
|
|
unsigned int freq = freq_table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
count++;
|
|
}
|
|
|
|
tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL);
|
|
if (!tab) {
|
|
dev_err(bg_ptr->dev,
|
|
"%s: no memory available\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
|
|
unsigned int freq = freq_table[i].frequency;
|
|
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
|
|
tab[count - i - 1].freq_clip_max = freq;
|
|
tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
|
|
tab[count - i - 1].mask_val = cpumask_of(0);
|
|
}
|
|
|
|
*tab_ptr = tab;
|
|
*tab_size = count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct omap_thermal_data *data;
|
|
struct freq_clip_table *tab_ptr;
|
|
int tab_size, ret;
|
|
|
|
data = omap_bandgap_get_sensor_data(bg_ptr, id);
|
|
if (!data)
|
|
data = omap_thermal_build_pdata(bg_ptr, id);
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
|
|
if (ret < 0) {
|
|
dev_err(bg_ptr->dev,
|
|
"%s: failed to build cpufreq clip table\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
/* Register cooling device */
|
|
data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
|
|
if (IS_ERR_OR_NULL(data->cool_dev)) {
|
|
dev_err(bg_ptr->dev,
|
|
"Failed to register cpufreq cooling device\n");
|
|
return PTR_ERR(data->cool_dev);
|
|
}
|
|
bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
|
|
omap_bandgap_set_sensor_data(bg_ptr, id, data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct omap_thermal_data *data;
|
|
|
|
data = omap_bandgap_get_sensor_data(bg_ptr, id);
|
|
cpufreq_cooling_unregister(data->cool_dev);
|
|
|
|
return 0;
|
|
}
|