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/cpufreq.h>
  32 #include <linux/cpumask.h>
  33 #include <linux/cpu_cooling.h>
  34 #include <linux/of.h>
  35
  36 #include "ti-thermal.h"
  37 #include "ti-bandgap.h"
  38
  39 /* common data structures */
  40 struct ti_thermal_data {
  41         struct thermal_zone_device *ti_thermal;
  42         struct thermal_zone_device *pcb_tz;
  43         struct thermal_cooling_device *cool_dev;
  44         struct ti_bandgap *bgp;
  45         enum thermal_device_mode mode;
  46         struct work_struct thermal_wq;
  47         int sensor_id;
  48         bool our_zone;
  49 };
  50
  51 static void ti_thermal_work(struct work_struct *work)
  52 {
  53         struct ti_thermal_data *data = container_of(work,
  54                                         struct ti_thermal_data, thermal_wq);
  55
  56         thermal_zone_device_update(data->ti_thermal);
  57
  58         dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
  59                 data->ti_thermal->type);
  60 }
  61
  62 /**
  63  * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
  64  * @t:  omap sensor temperature
  65  * @s:  omap sensor slope value
  66  * @c:  omap sensor const value
  67  */
  68 static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
  69 {
  70         int delta = t * s / 1000 + c;
  71
  72         if (delta < 0)
  73                 delta = 0;
  74
  75         return t + delta;
  76 }
  77
  78 /* thermal zone ops */
  79 /* Get temperature callback function for thermal zone*/
  80 static inline int __ti_thermal_get_temp(void *devdata, long *temp)
  81 {
  82         struct thermal_zone_device *pcb_tz = NULL;
  83         struct ti_thermal_data *data = devdata;
  84         struct ti_bandgap *bgp;
  85         const struct ti_temp_sensor *s;
  86         int ret, tmp, slope, constant;
  87         unsigned long pcb_temp;
  88
  89         if (!data)
  90                 return 0;
  91
  92         bgp = data->bgp;
  93         s = &bgp->conf->sensors[data->sensor_id];
  94
  95         ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
  96         if (ret)
  97                 return ret;
  98
  99         /* Default constants */
 100         slope = s->slope;
 101         constant = s->constant;
 102
 103         pcb_tz = data->pcb_tz;
 104         /* In case pcb zone is available, use the extrapolation rule with it */
 105         if (!IS_ERR(pcb_tz)) {
 106                 ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
 107                 if (!ret) {
 108                         tmp -= pcb_temp; /* got a valid PCB temp */
 109                         slope = s->slope_pcb;
 110                         constant = s->constant_pcb;
 111                 } else {
 112                         dev_err(bgp->dev,
 113                                 "Failed to read PCB state. Using defaults\n");
 114                         ret = 0;
 115                 }
 116         }
 117         *temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
 118
 119         return ret;
 120 }
 121
 122 static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
 123                                       unsigned long *temp)
 124 {
 125         struct ti_thermal_data *data = thermal->devdata;
 126
 127         return __ti_thermal_get_temp(data, temp);
 128 }
 129
 130 /* Bind callback functions for thermal zone */
 131 static int ti_thermal_bind(struct thermal_zone_device *thermal,
 132                            struct thermal_cooling_device *cdev)
 133 {
 134         struct ti_thermal_data *data = thermal->devdata;
 135         int id;
 136
 137         if (!data || IS_ERR(data))
 138                 return -ENODEV;
 139
 140         /* check if this is the cooling device we registered */
 141         if (data->cool_dev != cdev)
 142                 return 0;
 143
 144         id = data->sensor_id;
 145
 146         /* Simple thing, two trips, one passive another critical */
 147         return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 148         /* bind with min and max states defined by cpu_cooling */
 149                                                 THERMAL_NO_LIMIT,
 150                                                 THERMAL_NO_LIMIT);
 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, unsigned long *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, long *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         *trend = tr;
 256
 257         return 0;
 258 }
 259
 260 /* Get the temperature trend callback functions for thermal zone */
 261 static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
 262                                 int trip, enum thermal_trend *trend)
 263 {
 264         int ret;
 265         long tr;
 266
 267         ret = __ti_thermal_get_trend(thermal->devdata, &tr);
 268         if (ret)
 269                 return ret;
 270
 271         if (tr > 0)
 272                 *trend = THERMAL_TREND_RAISING;
 273         else if (tr < 0)
 274                 *trend = THERMAL_TREND_DROPPING;
 275         else
 276                 *trend = THERMAL_TREND_STABLE;
 277
 278         return 0;
 279 }
 280
 281 /* Get critical temperature callback functions for thermal zone */
 282 static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 283                                     unsigned long *temp)
 284 {
 285         /* shutdown zone */
 286         return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 287 }
 288
 289 static struct thermal_zone_device_ops ti_thermal_ops = {
 290         .get_temp = ti_thermal_get_temp,
 291         .get_trend = ti_thermal_get_trend,
 292         .bind = ti_thermal_bind,
 293         .unbind = ti_thermal_unbind,
 294         .get_mode = ti_thermal_get_mode,
 295         .set_mode = ti_thermal_set_mode,
 296         .get_trip_type = ti_thermal_get_trip_type,
 297         .get_trip_temp = ti_thermal_get_trip_temp,
 298         .get_crit_temp = ti_thermal_get_crit_temp,
 299 };
 300
 301 static struct ti_thermal_data
 302 *ti_thermal_build_data(struct ti_bandgap *bgp, int id)
 303 {
 304         struct ti_thermal_data *data;
 305
 306         data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
 307         if (!data) {
 308                 dev_err(bgp->dev, "kzalloc fail\n");
 309                 return NULL;
 310         }
 311         data->sensor_id = id;
 312         data->bgp = bgp;
 313         data->mode = THERMAL_DEVICE_ENABLED;
 314         /* pcb_tz will be either valid or PTR_ERR() */
 315         data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
 316         INIT_WORK(&data->thermal_wq, ti_thermal_work);
 317
 318         return data;
 319 }
 320
 321 int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 322                              char *domain)
 323 {
 324         struct ti_thermal_data *data;
 325
 326         data = ti_bandgap_get_sensor_data(bgp, id);
 327
 328         if (!data || IS_ERR(data))
 329                 data = ti_thermal_build_data(bgp, id);
 330
 331         if (!data)
 332                 return -EINVAL;
 333
 334         /* in case this is specified by DT */
 335         data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
 336                                         data, __ti_thermal_get_temp,
 337                                         __ti_thermal_get_trend);
 338         if (IS_ERR(data->ti_thermal)) {
 339                 /* Create thermal zone */
 340                 data->ti_thermal = thermal_zone_device_register(domain,
 341                                 OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
 342                                 NULL, FAST_TEMP_MONITORING_RATE,
 343                                 FAST_TEMP_MONITORING_RATE);
 344                 if (IS_ERR(data->ti_thermal)) {
 345                         dev_err(bgp->dev, "thermal zone device is NULL\n");
 346                         return PTR_ERR(data->ti_thermal);
 347                 }
 348                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 349                 data->our_zone = true;
 350         }
 351         ti_bandgap_set_sensor_data(bgp, id, data);
 352         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 353                                         data->ti_thermal->polling_delay);
 354
 355         return 0;
 356 }
 357
 358 int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
 359 {
 360         struct ti_thermal_data *data;
 361
 362         data = ti_bandgap_get_sensor_data(bgp, id);
 363
 364         if (data && data->ti_thermal) {
 365                 if (data->our_zone)
 366                         thermal_zone_device_unregister(data->ti_thermal);
 367                 else
 368                         thermal_zone_of_sensor_unregister(bgp->dev,
 369                                                           data->ti_thermal);
 370         }
 371
 372         return 0;
 373 }
 374
 375 int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
 376 {
 377         struct ti_thermal_data *data;
 378
 379         data = ti_bandgap_get_sensor_data(bgp, id);
 380
 381         schedule_work(&data->thermal_wq);
 382
 383         return 0;
 384 }
 385
 386 int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
 387 {
 388         struct ti_thermal_data *data;
 389         struct device_node *np = bgp->dev->of_node;
 390
 391         /*
 392          * We are assuming here that if one deploys the zone
 393          * using DT, then it must be aware that the cooling device
 394          * loading has to happen via cpufreq driver.
 395          */
 396         if (of_find_property(np, "#thermal-sensor-cells", NULL))
 397                 return 0;
 398
 399         data = ti_bandgap_get_sensor_data(bgp, id);
 400         if (!data || IS_ERR(data))
 401                 data = ti_thermal_build_data(bgp, id);
 402
 403         if (!data)
 404                 return -EINVAL;
 405
 406         if (!cpufreq_get_current_driver()) {
 407                 dev_dbg(bgp->dev, "no cpufreq driver yet\n");
 408                 return -EPROBE_DEFER;
 409         }
 410
 411         /* Register cooling device */
 412         data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
 413         if (IS_ERR(data->cool_dev)) {
 414                 dev_err(bgp->dev,
 415                         "Failed to register cpufreq cooling device\n");
 416                 return PTR_ERR(data->cool_dev);
 417         }
 418         ti_bandgap_set_sensor_data(bgp, id, data);
 419
 420         return 0;
 421 }
 422
 423 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
 424 {
 425         struct ti_thermal_data *data;
 426
 427         data = ti_bandgap_get_sensor_data(bgp, id);
 428
 429         if (data && data->cool_dev)
 430                 cpufreq_cooling_unregister(data->cool_dev);
 431
 432         return 0;
 433 }