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, int *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         int 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                                       int *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                                                 THERMAL_WEIGHT_DEFAULT);
 151 }
 152
 153 /* Unbind callback functions for thermal zone */
 154 static int ti_thermal_unbind(struct thermal_zone_device *thermal,
 155                              struct thermal_cooling_device *cdev)
 156 {
 157         struct ti_thermal_data *data = thermal->devdata;
 158
 159         if (!data || IS_ERR(data))
 160                 return -ENODEV;
 161
 162         /* check if this is the cooling device we registered */
 163         if (data->cool_dev != cdev)
 164                 return 0;
 165
 166         /* Simple thing, two trips, one passive another critical */
 167         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 168 }
 169
 170 /* Get mode callback functions for thermal zone */
 171 static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
 172                                enum thermal_device_mode *mode)
 173 {
 174         struct ti_thermal_data *data = thermal->devdata;
 175
 176         if (data)
 177                 *mode = data->mode;
 178
 179         return 0;
 180 }
 181
 182 /* Set mode callback functions for thermal zone */
 183 static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
 184                                enum thermal_device_mode mode)
 185 {
 186         struct ti_thermal_data *data = thermal->devdata;
 187         struct ti_bandgap *bgp;
 188
 189         bgp = data->bgp;
 190
 191         if (!data->ti_thermal) {
 192                 dev_notice(&thermal->device, "thermal zone not registered\n");
 193                 return 0;
 194         }
 195
 196         mutex_lock(&data->ti_thermal->lock);
 197
 198         if (mode == THERMAL_DEVICE_ENABLED)
 199                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 200         else
 201                 data->ti_thermal->polling_delay = 0;
 202
 203         mutex_unlock(&data->ti_thermal->lock);
 204
 205         data->mode = mode;
 206         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 207                                         data->ti_thermal->polling_delay);
 208         thermal_zone_device_update(data->ti_thermal);
 209         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 210                 data->ti_thermal->polling_delay);
 211
 212         return 0;
 213 }
 214
 215 /* Get trip type callback functions for thermal zone */
 216 static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
 217                                     int trip, enum thermal_trip_type *type)
 218 {
 219         if (!ti_thermal_is_valid_trip(trip))
 220                 return -EINVAL;
 221
 222         if (trip + 1 == OMAP_TRIP_NUMBER)
 223                 *type = THERMAL_TRIP_CRITICAL;
 224         else
 225                 *type = THERMAL_TRIP_PASSIVE;
 226
 227         return 0;
 228 }
 229
 230 /* Get trip temperature callback functions for thermal zone */
 231 static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 232                                     int trip, int *temp)
 233 {
 234         if (!ti_thermal_is_valid_trip(trip))
 235                 return -EINVAL;
 236
 237         *temp = ti_thermal_get_trip_value(trip);
 238
 239         return 0;
 240 }
 241
 242 static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *trend)
 243 {
 244         struct ti_thermal_data *data = p;
 245         struct ti_bandgap *bgp;
 246         int id, tr, ret = 0;
 247
 248         bgp = data->bgp;
 249         id = data->sensor_id;
 250
 251         ret = ti_bandgap_get_trend(bgp, id, &tr);
 252         if (ret)
 253                 return ret;
 254
 255         if (tr > 0)
 256                 *trend = THERMAL_TREND_RAISING;
 257         else if (tr < 0)
 258                 *trend = THERMAL_TREND_DROPPING;
 259         else
 260                 *trend = THERMAL_TREND_STABLE;
 261
 262         return 0;
 263 }
 264
 265 /* Get the temperature trend callback functions for thermal zone */
 266 static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
 267                                 int trip, enum thermal_trend *trend)
 268 {
 269         return __ti_thermal_get_trend(thermal->devdata, trip, trend);
 270 }
 271
 272 /* Get critical temperature callback functions for thermal zone */
 273 static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 274                                     int *temp)
 275 {
 276         /* shutdown zone */
 277         return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 278 }
 279
 280 static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
 281         .get_temp = __ti_thermal_get_temp,
 282         .get_trend = __ti_thermal_get_trend,
 283 };
 284
 285 static struct thermal_zone_device_ops ti_thermal_ops = {
 286         .get_temp = ti_thermal_get_temp,
 287         .get_trend = ti_thermal_get_trend,
 288         .bind = ti_thermal_bind,
 289         .unbind = ti_thermal_unbind,
 290         .get_mode = ti_thermal_get_mode,
 291         .set_mode = ti_thermal_set_mode,
 292         .get_trip_type = ti_thermal_get_trip_type,
 293         .get_trip_temp = ti_thermal_get_trip_temp,
 294         .get_crit_temp = ti_thermal_get_crit_temp,
 295 };
 296
 297 static struct ti_thermal_data
 298 *ti_thermal_build_data(struct ti_bandgap *bgp, int id)
 299 {
 300         struct ti_thermal_data *data;
 301
 302         data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
 303         if (!data) {
 304                 dev_err(bgp->dev, "kzalloc fail\n");
 305                 return NULL;
 306         }
 307         data->sensor_id = id;
 308         data->bgp = bgp;
 309         data->mode = THERMAL_DEVICE_ENABLED;
 310         /* pcb_tz will be either valid or PTR_ERR() */
 311         data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
 312         INIT_WORK(&data->thermal_wq, ti_thermal_work);
 313
 314         return data;
 315 }
 316
 317 int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 318                              char *domain)
 319 {
 320         struct ti_thermal_data *data;
 321
 322         data = ti_bandgap_get_sensor_data(bgp, id);
 323
 324         if (!data || IS_ERR(data))
 325                 data = ti_thermal_build_data(bgp, id);
 326
 327         if (!data)
 328                 return -EINVAL;
 329
 330         /* in case this is specified by DT */
 331         data->ti_thermal = devm_thermal_zone_of_sensor_register(bgp->dev, id,
 332                                         data, &ti_of_thermal_ops);
 333         if (IS_ERR(data->ti_thermal)) {
 334                 /* Create thermal zone */
 335                 data->ti_thermal = thermal_zone_device_register(domain,
 336                                 OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
 337                                 NULL, FAST_TEMP_MONITORING_RATE,
 338                                 FAST_TEMP_MONITORING_RATE);
 339                 if (IS_ERR(data->ti_thermal)) {
 340                         dev_err(bgp->dev, "thermal zone device is NULL\n");
 341                         return PTR_ERR(data->ti_thermal);
 342                 }
 343                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 344                 data->our_zone = true;
 345         }
 346         ti_bandgap_set_sensor_data(bgp, id, data);
 347         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 348                                         data->ti_thermal->polling_delay);
 349
 350         return 0;
 351 }
 352
 353 int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
 354 {
 355         struct ti_thermal_data *data;
 356
 357         data = ti_bandgap_get_sensor_data(bgp, id);
 358
 359         if (data && data->ti_thermal) {
 360                 if (data->our_zone)
 361                         thermal_zone_device_unregister(data->ti_thermal);
 362         }
 363
 364         return 0;
 365 }
 366
 367 int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
 368 {
 369         struct ti_thermal_data *data;
 370
 371         data = ti_bandgap_get_sensor_data(bgp, id);
 372
 373         schedule_work(&data->thermal_wq);
 374
 375         return 0;
 376 }
 377
 378 int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
 379 {
 380         struct ti_thermal_data *data;
 381         struct device_node *np = bgp->dev->of_node;
 382
 383         /*
 384          * We are assuming here that if one deploys the zone
 385          * using DT, then it must be aware that the cooling device
 386          * loading has to happen via cpufreq driver.
 387          */
 388         if (of_find_property(np, "#thermal-sensor-cells", NULL))
 389                 return 0;
 390
 391         data = ti_bandgap_get_sensor_data(bgp, id);
 392         if (!data || IS_ERR(data))
 393                 data = ti_thermal_build_data(bgp, id);
 394
 395         if (!data)
 396                 return -EINVAL;
 397
 398         /* Register cooling device */
 399         data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
 400         if (IS_ERR(data->cool_dev)) {
 401                 int ret = PTR_ERR(data->cool_dev);
 402
 403                 if (ret != -EPROBE_DEFER)
 404                         dev_err(bgp->dev,
 405                                 "Failed to register cpu cooling device %d\n",
 406                                 ret);
 407
 408                 return ret;
 409         }
 410         ti_bandgap_set_sensor_data(bgp, id, data);
 411
 412         return 0;
 413 }
 414
 415 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
 416 {
 417         struct ti_thermal_data *data;
 418
 419         data = ti_bandgap_get_sensor_data(bgp, id);
 420
 421         if (data)
 422                 cpufreq_cooling_unregister(data->cool_dev);
 423
 424         return 0;
 425 }