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445eaf87 EV |
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> | |
5035d48d | 31 | #include <linux/cpumask.h> |
445eaf87 | 32 | #include <linux/cpu_cooling.h> |
26d9cc65 | 33 | #include <linux/of.h> |
445eaf87 | 34 | |
7372add4 EV |
35 | #include "ti-thermal.h" |
36 | #include "ti-bandgap.h" | |
445eaf87 EV |
37 | |
38 | /* common data structures */ | |
03e859d3 EV |
39 | struct ti_thermal_data { |
40 | struct thermal_zone_device *ti_thermal; | |
359836e1 | 41 | struct thermal_zone_device *pcb_tz; |
445eaf87 | 42 | struct thermal_cooling_device *cool_dev; |
03e859d3 | 43 | struct ti_bandgap *bgp; |
445eaf87 EV |
44 | enum thermal_device_mode mode; |
45 | struct work_struct thermal_wq; | |
46 | int sensor_id; | |
26d9cc65 | 47 | bool our_zone; |
445eaf87 EV |
48 | }; |
49 | ||
03e859d3 | 50 | static void ti_thermal_work(struct work_struct *work) |
445eaf87 | 51 | { |
03e859d3 EV |
52 | struct ti_thermal_data *data = container_of(work, |
53 | struct ti_thermal_data, thermal_wq); | |
445eaf87 | 54 | |
03e859d3 | 55 | thermal_zone_device_update(data->ti_thermal); |
445eaf87 | 56 | |
03e859d3 EV |
57 | dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n", |
58 | data->ti_thermal->type); | |
445eaf87 EV |
59 | } |
60 | ||
61 | /** | |
03e859d3 | 62 | * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature |
445eaf87 EV |
63 | * @t: omap sensor temperature |
64 | * @s: omap sensor slope value | |
65 | * @c: omap sensor const value | |
66 | */ | |
03e859d3 | 67 | static inline int ti_thermal_hotspot_temperature(int t, int s, int c) |
445eaf87 EV |
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 */ | |
e34238bf | 78 | /* Get temperature callback function for thermal zone */ |
17e8351a | 79 | static inline int __ti_thermal_get_temp(void *devdata, int *temp) |
445eaf87 | 80 | { |
359836e1 | 81 | struct thermal_zone_device *pcb_tz = NULL; |
26d9cc65 | 82 | struct ti_thermal_data *data = devdata; |
03e859d3 | 83 | struct ti_bandgap *bgp; |
9879b2c4 | 84 | const struct ti_temp_sensor *s; |
359836e1 | 85 | int ret, tmp, slope, constant; |
17e8351a | 86 | int pcb_temp; |
445eaf87 | 87 | |
04a4d10d EV |
88 | if (!data) |
89 | return 0; | |
90 | ||
d7f080e6 EV |
91 | bgp = data->bgp; |
92 | s = &bgp->conf->sensors[data->sensor_id]; | |
04a4d10d | 93 | |
03e859d3 | 94 | ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp); |
445eaf87 EV |
95 | if (ret) |
96 | return ret; | |
97 | ||
359836e1 EV |
98 | /* Default constants */ |
99 | slope = s->slope; | |
100 | constant = s->constant; | |
101 | ||
102 | pcb_tz = data->pcb_tz; | |
445eaf87 | 103 | /* In case pcb zone is available, use the extrapolation rule with it */ |
0c12b5ac | 104 | if (!IS_ERR(pcb_tz)) { |
359836e1 EV |
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"); | |
df8f1347 | 113 | ret = 0; |
359836e1 | 114 | } |
445eaf87 | 115 | } |
03e859d3 | 116 | *temp = ti_thermal_hotspot_temperature(tmp, slope, constant); |
445eaf87 EV |
117 | |
118 | return ret; | |
119 | } | |
120 | ||
26d9cc65 | 121 | static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal, |
17e8351a | 122 | int *temp) |
26d9cc65 EV |
123 | { |
124 | struct ti_thermal_data *data = thermal->devdata; | |
125 | ||
126 | return __ti_thermal_get_temp(data, temp); | |
127 | } | |
128 | ||
445eaf87 | 129 | /* Bind callback functions for thermal zone */ |
03e859d3 EV |
130 | static int ti_thermal_bind(struct thermal_zone_device *thermal, |
131 | struct thermal_cooling_device *cdev) | |
445eaf87 | 132 | { |
03e859d3 | 133 | struct ti_thermal_data *data = thermal->devdata; |
5035d48d | 134 | int id; |
445eaf87 | 135 | |
0c12b5ac | 136 | if (!data || IS_ERR(data)) |
445eaf87 EV |
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; | |
445eaf87 | 144 | |
445eaf87 | 145 | /* Simple thing, two trips, one passive another critical */ |
a7a3b8c8 | 146 | return thermal_zone_bind_cooling_device(thermal, 0, cdev, |
67b4c474 | 147 | /* bind with min and max states defined by cpu_cooling */ |
a7a3b8c8 | 148 | THERMAL_NO_LIMIT, |
6cd9e9f6 KS |
149 | THERMAL_NO_LIMIT, |
150 | THERMAL_WEIGHT_DEFAULT); | |
445eaf87 EV |
151 | } |
152 | ||
153 | /* Unbind callback functions for thermal zone */ | |
03e859d3 EV |
154 | static int ti_thermal_unbind(struct thermal_zone_device *thermal, |
155 | struct thermal_cooling_device *cdev) | |
445eaf87 | 156 | { |
03e859d3 | 157 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 | 158 | |
0c12b5ac | 159 | if (!data || IS_ERR(data)) |
445eaf87 EV |
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 */ | |
03e859d3 EV |
171 | static int ti_thermal_get_mode(struct thermal_zone_device *thermal, |
172 | enum thermal_device_mode *mode) | |
445eaf87 | 173 | { |
03e859d3 | 174 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 EV |
175 | |
176 | if (data) | |
177 | *mode = data->mode; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | /* Set mode callback functions for thermal zone */ | |
03e859d3 EV |
183 | static int ti_thermal_set_mode(struct thermal_zone_device *thermal, |
184 | enum thermal_device_mode mode) | |
445eaf87 | 185 | { |
03e859d3 | 186 | struct ti_thermal_data *data = thermal->devdata; |
10ccff1b RK |
187 | struct ti_bandgap *bgp; |
188 | ||
189 | bgp = data->bgp; | |
445eaf87 | 190 | |
03e859d3 | 191 | if (!data->ti_thermal) { |
445eaf87 EV |
192 | dev_notice(&thermal->device, "thermal zone not registered\n"); |
193 | return 0; | |
194 | } | |
195 | ||
03e859d3 | 196 | mutex_lock(&data->ti_thermal->lock); |
445eaf87 EV |
197 | |
198 | if (mode == THERMAL_DEVICE_ENABLED) | |
03e859d3 | 199 | data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; |
445eaf87 | 200 | else |
03e859d3 | 201 | data->ti_thermal->polling_delay = 0; |
445eaf87 | 202 | |
03e859d3 | 203 | mutex_unlock(&data->ti_thermal->lock); |
445eaf87 EV |
204 | |
205 | data->mode = mode; | |
10ccff1b RK |
206 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
207 | data->ti_thermal->polling_delay); | |
03e859d3 | 208 | thermal_zone_device_update(data->ti_thermal); |
445eaf87 | 209 | dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n", |
03e859d3 | 210 | data->ti_thermal->polling_delay); |
445eaf87 EV |
211 | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Get trip type callback functions for thermal zone */ | |
03e859d3 EV |
216 | static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal, |
217 | int trip, enum thermal_trip_type *type) | |
445eaf87 | 218 | { |
03e859d3 | 219 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
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 */ | |
03e859d3 | 231 | static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal, |
17e8351a | 232 | int trip, int *temp) |
445eaf87 | 233 | { |
03e859d3 | 234 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
235 | return -EINVAL; |
236 | ||
03e859d3 | 237 | *temp = ti_thermal_get_trip_value(trip); |
445eaf87 EV |
238 | |
239 | return 0; | |
240 | } | |
241 | ||
26d9cc65 | 242 | static int __ti_thermal_get_trend(void *p, long *trend) |
03b7f67b | 243 | { |
26d9cc65 | 244 | struct ti_thermal_data *data = p; |
03b7f67b K |
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 | ||
26d9cc65 EV |
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 | ||
03b7f67b K |
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 | ||
445eaf87 | 281 | /* Get critical temperature callback functions for thermal zone */ |
03e859d3 | 282 | static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal, |
17e8351a | 283 | int *temp) |
445eaf87 EV |
284 | { |
285 | /* shutdown zone */ | |
03e859d3 | 286 | return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp); |
445eaf87 EV |
287 | } |
288 | ||
2251aef6 EV |
289 | static const struct thermal_zone_of_device_ops ti_of_thermal_ops = { |
290 | .get_temp = __ti_thermal_get_temp, | |
291 | .get_trend = __ti_thermal_get_trend, | |
292 | }; | |
293 | ||
03e859d3 EV |
294 | static struct thermal_zone_device_ops ti_thermal_ops = { |
295 | .get_temp = ti_thermal_get_temp, | |
03b7f67b | 296 | .get_trend = ti_thermal_get_trend, |
03e859d3 EV |
297 | .bind = ti_thermal_bind, |
298 | .unbind = ti_thermal_unbind, | |
299 | .get_mode = ti_thermal_get_mode, | |
300 | .set_mode = ti_thermal_set_mode, | |
301 | .get_trip_type = ti_thermal_get_trip_type, | |
302 | .get_trip_temp = ti_thermal_get_trip_temp, | |
303 | .get_crit_temp = ti_thermal_get_crit_temp, | |
445eaf87 EV |
304 | }; |
305 | ||
03e859d3 EV |
306 | static struct ti_thermal_data |
307 | *ti_thermal_build_data(struct ti_bandgap *bgp, int id) | |
445eaf87 | 308 | { |
03e859d3 | 309 | struct ti_thermal_data *data; |
445eaf87 | 310 | |
d7f080e6 | 311 | data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); |
445eaf87 | 312 | if (!data) { |
d7f080e6 | 313 | dev_err(bgp->dev, "kzalloc fail\n"); |
04a4d10d | 314 | return NULL; |
445eaf87 EV |
315 | } |
316 | data->sensor_id = id; | |
d7f080e6 | 317 | data->bgp = bgp; |
445eaf87 | 318 | data->mode = THERMAL_DEVICE_ENABLED; |
0c12b5ac | 319 | /* pcb_tz will be either valid or PTR_ERR() */ |
359836e1 | 320 | data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); |
03e859d3 | 321 | INIT_WORK(&data->thermal_wq, ti_thermal_work); |
445eaf87 | 322 | |
04a4d10d EV |
323 | return data; |
324 | } | |
325 | ||
03e859d3 EV |
326 | int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, |
327 | char *domain) | |
04a4d10d | 328 | { |
03e859d3 | 329 | struct ti_thermal_data *data; |
04a4d10d | 330 | |
03e859d3 | 331 | data = ti_bandgap_get_sensor_data(bgp, id); |
04a4d10d | 332 | |
0c12b5ac | 333 | if (!data || IS_ERR(data)) |
03e859d3 | 334 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
335 | |
336 | if (!data) | |
337 | return -EINVAL; | |
338 | ||
26d9cc65 EV |
339 | /* in case this is specified by DT */ |
340 | data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id, | |
2251aef6 | 341 | data, &ti_of_thermal_ops); |
26d9cc65 EV |
342 | if (IS_ERR(data->ti_thermal)) { |
343 | /* Create thermal zone */ | |
344 | data->ti_thermal = thermal_zone_device_register(domain, | |
03e859d3 | 345 | OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops, |
50125a9b | 346 | NULL, FAST_TEMP_MONITORING_RATE, |
765a1939 | 347 | FAST_TEMP_MONITORING_RATE); |
26d9cc65 EV |
348 | if (IS_ERR(data->ti_thermal)) { |
349 | dev_err(bgp->dev, "thermal zone device is NULL\n"); | |
350 | return PTR_ERR(data->ti_thermal); | |
351 | } | |
352 | data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; | |
353 | data->our_zone = true; | |
445eaf87 | 354 | } |
03e859d3 | 355 | ti_bandgap_set_sensor_data(bgp, id, data); |
10ccff1b RK |
356 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
357 | data->ti_thermal->polling_delay); | |
445eaf87 EV |
358 | |
359 | return 0; | |
360 | } | |
361 | ||
03e859d3 | 362 | int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) |
445eaf87 | 363 | { |
03e859d3 | 364 | struct ti_thermal_data *data; |
445eaf87 | 365 | |
03e859d3 | 366 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 | 367 | |
26d9cc65 EV |
368 | if (data && data->ti_thermal) { |
369 | if (data->our_zone) | |
370 | thermal_zone_device_unregister(data->ti_thermal); | |
371 | else | |
372 | thermal_zone_of_sensor_unregister(bgp->dev, | |
373 | data->ti_thermal); | |
374 | } | |
445eaf87 EV |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
03e859d3 | 379 | int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) |
445eaf87 | 380 | { |
03e859d3 | 381 | struct ti_thermal_data *data; |
445eaf87 | 382 | |
03e859d3 | 383 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
384 | |
385 | schedule_work(&data->thermal_wq); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
03e859d3 | 390 | int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 391 | { |
03e859d3 | 392 | struct ti_thermal_data *data; |
26d9cc65 EV |
393 | struct device_node *np = bgp->dev->of_node; |
394 | ||
395 | /* | |
396 | * We are assuming here that if one deploys the zone | |
397 | * using DT, then it must be aware that the cooling device | |
398 | * loading has to happen via cpufreq driver. | |
399 | */ | |
400 | if (of_find_property(np, "#thermal-sensor-cells", NULL)) | |
401 | return 0; | |
445eaf87 | 402 | |
03e859d3 | 403 | data = ti_bandgap_get_sensor_data(bgp, id); |
0c12b5ac | 404 | if (!data || IS_ERR(data)) |
03e859d3 | 405 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
406 | |
407 | if (!data) | |
408 | return -EINVAL; | |
445eaf87 | 409 | |
445eaf87 | 410 | /* Register cooling device */ |
5035d48d | 411 | data->cool_dev = cpufreq_cooling_register(cpu_present_mask); |
0c12b5ac | 412 | if (IS_ERR(data->cool_dev)) { |
cffafc32 EV |
413 | int ret = PTR_ERR(data->cool_dev); |
414 | ||
415 | if (ret != -EPROBE_DEFER) | |
416 | dev_err(bgp->dev, | |
417 | "Failed to register cpu cooling device %d\n", | |
418 | ret); | |
419 | ||
420 | return ret; | |
445eaf87 | 421 | } |
03e859d3 | 422 | ti_bandgap_set_sensor_data(bgp, id, data); |
445eaf87 EV |
423 | |
424 | return 0; | |
425 | } | |
426 | ||
03e859d3 | 427 | int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 428 | { |
03e859d3 | 429 | struct ti_thermal_data *data; |
445eaf87 | 430 | |
03e859d3 | 431 | data = ti_bandgap_get_sensor_data(bgp, id); |
26d9cc65 | 432 | |
9ca9be2b | 433 | if (data) |
26d9cc65 | 434 | cpufreq_cooling_unregister(data->cool_dev); |
445eaf87 EV |
435 | |
436 | return 0; | |
437 | } |