drivers/thermal/ti-soc-thermal/ti-thermal-common.c

   1 /*
   2  * OMAP thermal driver interface
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   5  * Contact:
   6  *   Eduardo Valentin <eduardo.valentin@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/device.h>
  25 #include <linux/err.h>
  26 #include <linux/mutex.h>
  27 #include <linux/gfp.h>
  28 #include <linux/kernel.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/thermal.h>
  31 #include <linux/cpumask.h>
  32 #include <linux/cpu_cooling.h>
  33 #include <linux/of.h>
  34
  35 #include "ti-thermal.h"
  36 #include "ti-bandgap.h"
  37
  38 /* common data structures */
  39 struct ti_thermal_data {
  40         struct thermal_zone_device *ti_thermal;
  41         struct thermal_zone_device *pcb_tz;
  42         struct thermal_cooling_device *cool_dev;
  43         struct ti_bandgap *bgp;
  44         enum thermal_device_mode mode;
  45         struct work_struct thermal_wq;
  46         int sensor_id;
  47         bool our_zone;
  48 };
  49
  50 static void ti_thermal_work(struct work_struct *work)
  51 {
  52         struct ti_thermal_data *data = container_of(work,
  53                                         struct ti_thermal_data, thermal_wq);
  54
  55         thermal_zone_device_update(data->ti_thermal);
  56
  57         dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
  58                 data->ti_thermal->type);
  59 }
  60
  61 /**
  62  * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
  63  * @t:  omap sensor temperature
  64  * @s:  omap sensor slope value
  65  * @c:  omap sensor const value
  66  */
  67 static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
  68 {
  69         int delta = t * s / 1000 + c;
  70
  71         if (delta < 0)
  72                 delta = 0;
  73
  74         return t + delta;
  75 }
  76
  77 /* thermal zone ops */
  78 /* Get temperature callback function for thermal zone*/
  79 static inline int __ti_thermal_get_temp(void *devdata, long *temp)
  80 {
  81         struct thermal_zone_device *pcb_tz = NULL;
  82         struct ti_thermal_data *data = devdata;
  83         struct ti_bandgap *bgp;
  84         const struct ti_temp_sensor *s;
  85         int ret, tmp, slope, constant;
  86         unsigned long pcb_temp;
  87
  88         if (!data)
  89                 return 0;
  90
  91         bgp = data->bgp;
  92         s = &bgp->conf->sensors[data->sensor_id];
  93
  94         ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
  95         if (ret)
  96                 return ret;
  97
  98         /* Default constants */
  99         slope = s->slope;
 100         constant = s->constant;
 101
 102         pcb_tz = data->pcb_tz;
 103         /* In case pcb zone is available, use the extrapolation rule with it */
 104         if (!IS_ERR(pcb_tz)) {
 105                 ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
 106                 if (!ret) {
 107                         tmp -= pcb_temp; /* got a valid PCB temp */
 108                         slope = s->slope_pcb;
 109                         constant = s->constant_pcb;
 110                 } else {
 111                         dev_err(bgp->dev,
 112                                 "Failed to read PCB state. Using defaults\n");
 113                         ret = 0;
 114                 }
 115         }
 116         *temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
 117
 118         return ret;
 119 }
 120
 121 static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
 122                                       unsigned long *temp)
 123 {
 124         struct ti_thermal_data *data = thermal->devdata;
 125
 126         return __ti_thermal_get_temp(data, temp);
 127 }
 128
 129 /* Bind callback functions for thermal zone */
 130 static int ti_thermal_bind(struct thermal_zone_device *thermal,
 131                            struct thermal_cooling_device *cdev)
 132 {
 133         struct ti_thermal_data *data = thermal->devdata;
 134         int id;
 135
 136         if (!data || IS_ERR(data))
 137                 return -ENODEV;
 138
 139         /* check if this is the cooling device we registered */
 140         if (data->cool_dev != cdev)
 141                 return 0;
 142
 143         id = data->sensor_id;
 144
 145         /* Simple thing, two trips, one passive another critical */
 146         return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 147         /* bind with min and max states defined by cpu_cooling */
 148                                                 THERMAL_NO_LIMIT,
 149                                                 THERMAL_NO_LIMIT);
 150 }
 151
 152 /* Unbind callback functions for thermal zone */
 153 static int ti_thermal_unbind(struct thermal_zone_device *thermal,
 154                              struct thermal_cooling_device *cdev)
 155 {
 156         struct ti_thermal_data *data = thermal->devdata;
 157
 158         if (!data || IS_ERR(data))
 159                 return -ENODEV;
 160
 161         /* check if this is the cooling device we registered */
 162         if (data->cool_dev != cdev)
 163                 return 0;
 164
 165         /* Simple thing, two trips, one passive another critical */
 166         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 167 }
 168
 169 /* Get mode callback functions for thermal zone */
 170 static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
 171                                enum thermal_device_mode *mode)
 172 {
 173         struct ti_thermal_data *data = thermal->devdata;
 174
 175         if (data)
 176                 *mode = data->mode;
 177
 178         return 0;
 179 }
 180
 181 /* Set mode callback functions for thermal zone */
 182 static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
 183                                enum thermal_device_mode mode)
 184 {
 185         struct ti_thermal_data *data = thermal->devdata;
 186         struct ti_bandgap *bgp;
 187
 188         bgp = data->bgp;
 189
 190         if (!data->ti_thermal) {
 191                 dev_notice(&thermal->device, "thermal zone not registered\n");
 192                 return 0;
 193         }
 194
 195         mutex_lock(&data->ti_thermal->lock);
 196
 197         if (mode == THERMAL_DEVICE_ENABLED)
 198                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 199         else
 200                 data->ti_thermal->polling_delay = 0;
 201
 202         mutex_unlock(&data->ti_thermal->lock);
 203
 204         data->mode = mode;
 205         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 206                                         data->ti_thermal->polling_delay);
 207         thermal_zone_device_update(data->ti_thermal);
 208         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 209                 data->ti_thermal->polling_delay);
 210
 211         return 0;
 212 }
 213
 214 /* Get trip type callback functions for thermal zone */
 215 static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
 216                                     int trip, enum thermal_trip_type *type)
 217 {
 218         if (!ti_thermal_is_valid_trip(trip))
 219                 return -EINVAL;
 220
 221         if (trip + 1 == OMAP_TRIP_NUMBER)
 222                 *type = THERMAL_TRIP_CRITICAL;
 223         else
 224                 *type = THERMAL_TRIP_PASSIVE;
 225
 226         return 0;
 227 }
 228
 229 /* Get trip temperature callback functions for thermal zone */
 230 static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 231                                     int trip, unsigned long *temp)
 232 {
 233         if (!ti_thermal_is_valid_trip(trip))
 234                 return -EINVAL;
 235
 236         *temp = ti_thermal_get_trip_value(trip);
 237
 238         return 0;
 239 }
 240
 241 static int __ti_thermal_get_trend(void *p, long *trend)
 242 {
 243         struct ti_thermal_data *data = p;
 244         struct ti_bandgap *bgp;
 245         int id, tr, ret = 0;
 246
 247         bgp = data->bgp;
 248         id = data->sensor_id;
 249
 250         ret = ti_bandgap_get_trend(bgp, id, &tr);
 251         if (ret)
 252                 return ret;
 253
 254         *trend = tr;
 255
 256         return 0;
 257 }
 258
 259 /* Get the temperature trend callback functions for thermal zone */
 260 static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
 261                                 int trip, enum thermal_trend *trend)
 262 {
 263         int ret;
 264         long tr;
 265
 266         ret = __ti_thermal_get_trend(thermal->devdata, &tr);
 267         if (ret)
 268                 return ret;
 269
 270         if (tr > 0)
 271                 *trend = THERMAL_TREND_RAISING;
 272         else if (tr < 0)
 273                 *trend = THERMAL_TREND_DROPPING;
 274         else
 275                 *trend = THERMAL_TREND_STABLE;
 276
 277         return 0;
 278 }
 279
 280 /* Get critical temperature callback functions for thermal zone */
 281 static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 282                                     unsigned long *temp)
 283 {
 284         /* shutdown zone */
 285         return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 286 }
 287
 288 static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
 289         .get_temp = __ti_thermal_get_temp,
 290         .get_trend = __ti_thermal_get_trend,
 291 };
 292
 293 static struct thermal_zone_device_ops ti_thermal_ops = {
 294         .get_temp = ti_thermal_get_temp,
 295         .get_trend = ti_thermal_get_trend,
 296         .bind = ti_thermal_bind,
 297         .unbind = ti_thermal_unbind,
 298         .get_mode = ti_thermal_get_mode,
 299         .set_mode = ti_thermal_set_mode,
 300         .get_trip_type = ti_thermal_get_trip_type,
 301         .get_trip_temp = ti_thermal_get_trip_temp,
 302         .get_crit_temp = ti_thermal_get_crit_temp,
 303 };
 304
 305 static struct ti_thermal_data
 306 *ti_thermal_build_data(struct ti_bandgap *bgp, int id)
 307 {
 308         struct ti_thermal_data *data;
 309
 310         data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
 311         if (!data) {
 312                 dev_err(bgp->dev, "kzalloc fail\n");
 313                 return NULL;
 314         }
 315         data->sensor_id = id;
 316         data->bgp = bgp;
 317         data->mode = THERMAL_DEVICE_ENABLED;
 318         /* pcb_tz will be either valid or PTR_ERR() */
 319         data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
 320         INIT_WORK(&data->thermal_wq, ti_thermal_work);
 321
 322         return data;
 323 }
 324
 325 int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 326                              char *domain)
 327 {
 328         struct ti_thermal_data *data;
 329
 330         data = ti_bandgap_get_sensor_data(bgp, id);
 331
 332         if (!data || IS_ERR(data))
 333                 data = ti_thermal_build_data(bgp, id);
 334
 335         if (!data)
 336                 return -EINVAL;
 337
 338         /* in case this is specified by DT */
 339         data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
 340                                         data, &ti_of_thermal_ops);
 341         if (IS_ERR(data->ti_thermal)) {
 342                 /* Create thermal zone */
 343                 data->ti_thermal = thermal_zone_device_register(domain,
 344                                 OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
 345                                 NULL, FAST_TEMP_MONITORING_RATE,
 346                                 FAST_TEMP_MONITORING_RATE);
 347                 if (IS_ERR(data->ti_thermal)) {
 348                         dev_err(bgp->dev, "thermal zone device is NULL\n");
 349                         return PTR_ERR(data->ti_thermal);
 350                 }
 351                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 352                 data->our_zone = true;
 353         }
 354         ti_bandgap_set_sensor_data(bgp, id, data);
 355         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 356                                         data->ti_thermal->polling_delay);
 357
 358         return 0;
 359 }
 360
 361 int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
 362 {
 363         struct ti_thermal_data *data;
 364
 365         data = ti_bandgap_get_sensor_data(bgp, id);
 366
 367         if (data && data->ti_thermal) {
 368                 if (data->our_zone)
 369                         thermal_zone_device_unregister(data->ti_thermal);
 370                 else
 371                         thermal_zone_of_sensor_unregister(bgp->dev,
 372                                                           data->ti_thermal);
 373         }
 374
 375         return 0;
 376 }
 377
 378 int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
 379 {
 380         struct ti_thermal_data *data;
 381
 382         data = ti_bandgap_get_sensor_data(bgp, id);
 383
 384         schedule_work(&data->thermal_wq);
 385
 386         return 0;
 387 }
 388
 389 int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
 390 {
 391         struct ti_thermal_data *data;
 392         struct device_node *np = bgp->dev->of_node;
 393
 394         /*
 395          * We are assuming here that if one deploys the zone
 396          * using DT, then it must be aware that the cooling device
 397          * loading has to happen via cpufreq driver.
 398          */
 399         if (of_find_property(np, "#thermal-sensor-cells", NULL))
 400                 return 0;
 401
 402         data = ti_bandgap_get_sensor_data(bgp, id);
 403         if (!data || IS_ERR(data))
 404                 data = ti_thermal_build_data(bgp, id);
 405
 406         if (!data)
 407                 return -EINVAL;
 408
 409         /* Register cooling device */
 410         data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
 411         if (IS_ERR(data->cool_dev)) {
 412                 int ret = PTR_ERR(data->cool_dev);
 413
 414                 if (ret != -EPROBE_DEFER)
 415                         dev_err(bgp->dev,
 416                                 "Failed to register cpu cooling device %d\n",
 417                                 ret);
 418
 419                 return ret;
 420         }
 421         ti_bandgap_set_sensor_data(bgp, id, data);
 422
 423         return 0;
 424 }
 425
 426 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
 427 {
 428         struct ti_thermal_data *data;
 429
 430         data = ti_bandgap_get_sensor_data(bgp, id);
 431
 432         if (data && data->cool_dev)
 433                 cpufreq_cooling_unregister(data->cool_dev);
 434
 435         return 0;
 436 }