summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/staging/omap-thermal/Kconfig9
-rw-r--r--drivers/staging/omap-thermal/Makefile1
-rw-r--r--drivers/staging/omap-thermal/omap-thermal-common.c364
-rw-r--r--drivers/staging/omap-thermal/omap-thermal.h108
4 files changed, 482 insertions, 0 deletions
diff --git a/drivers/staging/omap-thermal/Kconfig b/drivers/staging/omap-thermal/Kconfig
index 8c9979dfaa69..f44228c1b598 100644
--- a/drivers/staging/omap-thermal/Kconfig
+++ b/drivers/staging/omap-thermal/Kconfig
@@ -9,3 +9,12 @@ config OMAP_BANDGAP
This includes alert interrupts generation and also the TSHUT
support.
+
+config OMAP_THERMAL
+ bool "Texas Instruments OMAP4+ thermal framework support"
+ depends on OMAP_BANDGAP
+ depends on CPU_THERMAL
+ help
+ If you say yes here you want to get support for generic thermal
+ framework for the Texas Instruments OMAP4460+ on die bandgap
+ temperature sensor.
diff --git a/drivers/staging/omap-thermal/Makefile b/drivers/staging/omap-thermal/Makefile
index c92a854e65f1..fcdf77336fc8 100644
--- a/drivers/staging/omap-thermal/Makefile
+++ b/drivers/staging/omap-thermal/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_OMAP_BANDGAP) += omap-thermal.o
omap-thermal-y := omap-bandgap.o
+omap-thermal-$(CONFIG_OMAP_THERMAL) += omap-thermal-common.o
diff --git a/drivers/staging/omap-thermal/omap-thermal-common.c b/drivers/staging/omap-thermal/omap-thermal-common.c
new file mode 100644
index 000000000000..0675a5e2f7c8
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap-thermal-common.c
@@ -0,0 +1,364 @@
+/*
+ * 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 = data->bg_ptr;
+ struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id];
+ int ret, tmp, pcb_temp, slope, constant;
+
+ 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);
+}
+
+/* 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,
+};
+
+int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
+ char *domain)
+{
+ 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 -ENOMEM;
+ }
+ data->sensor_id = id;
+ data->bg_ptr = bg_ptr;
+ data->mode = THERMAL_DEVICE_ENABLED;
+ INIT_WORK(&data->thermal_wq, omap_thermal_work);
+
+ /* TODO: remove TC1 TC2 */
+ /* Create thermal zone */
+ data->omap_thermal = thermal_zone_device_register(domain,
+ OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
+ 0, FAST_TEMP_MONITORING_RATE, 0, 0);
+ 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);
+
+ 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;
+
+ 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;
+}
diff --git a/drivers/staging/omap-thermal/omap-thermal.h b/drivers/staging/omap-thermal/omap-thermal.h
new file mode 100644
index 000000000000..0dd2184b9663
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap-thermal.h
@@ -0,0 +1,108 @@
+/*
+ * OMAP thermal definitions
+ *
+ * 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
+ *
+ */
+#ifndef __OMAP_THERMAL_H
+#define __OMAP_THERMAL_H
+
+#include "omap-bandgap.h"
+
+/* sensors gradient and offsets */
+#define OMAP_GRADIENT_SLOPE_4460 348
+#define OMAP_GRADIENT_CONST_4460 -9301
+#define OMAP_GRADIENT_SLOPE_4470 308
+#define OMAP_GRADIENT_CONST_4470 -7896
+
+#define OMAP_GRADIENT_SLOPE_5430_CPU 196
+#define OMAP_GRADIENT_CONST_5430_CPU -6822
+#define OMAP_GRADIENT_SLOPE_5430_GPU 64
+#define OMAP_GRADIENT_CONST_5430_GPU 978
+
+/* PCB sensor calculation constants */
+#define OMAP_GRADIENT_SLOPE_W_PCB_4460 1142
+#define OMAP_GRADIENT_CONST_W_PCB_4460 -393
+#define OMAP_GRADIENT_SLOPE_W_PCB_4470 1063
+#define OMAP_GRADIENT_CONST_W_PCB_4470 -477
+
+#define OMAP_GRADIENT_SLOPE_W_PCB_5430_CPU 469
+#define OMAP_GRADIENT_CONST_W_PCB_5430_CPU -1272
+#define OMAP_GRADIENT_SLOPE_W_PCB_5430_GPU 378
+#define OMAP_GRADIENT_CONST_W_PCB_5430_GPU 154
+
+/* trip points of interest in milicelsius (at hotspot level) */
+#define OMAP_TRIP_COLD 100000
+#define OMAP_TRIP_HOT 110000
+#define OMAP_TRIP_SHUTDOWN 125000
+#define OMAP_TRIP_NUMBER 2
+#define OMAP_TRIP_STEP \
+ ((OMAP_TRIP_SHUTDOWN - OMAP_TRIP_HOT) / (OMAP_TRIP_NUMBER - 1))
+
+/* Update rates */
+#define FAST_TEMP_MONITORING_RATE 250
+
+/* helper macros */
+/**
+ * omap_thermal_get_trip_value - returns trip temperature based on index
+ * @i: trip index
+ */
+#define omap_thermal_get_trip_value(i) \
+ (OMAP_TRIP_HOT + ((i) * OMAP_TRIP_STEP))
+
+/**
+ * omap_thermal_is_valid_trip - check for trip index
+ * @i: trip index
+ */
+#define omap_thermal_is_valid_trip(trip) \
+ ((trip) >= 0 && (trip) < OMAP_TRIP_NUMBER)
+
+#ifdef CONFIG_OMAP_THERMAL
+int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
+ char *domain);
+int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id);
+int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id);
+int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id);
+#else
+static inline
+int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
+ char *domain)
+{
+ return 0;
+}
+
+static inline
+int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
+{
+ return 0;
+}
+
+static inline
+int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
+{
+ return 0;
+}
+
+static inline
+int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
+{
+ return 0;
+}
+#endif
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 17:05:57 +0000