Commit | Line | Data |
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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 */ | |
78 | /* Get temperature callback function for thermal zone*/ | |
26d9cc65 | 79 | static inline int __ti_thermal_get_temp(void *devdata, long *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 EV |
85 | int ret, tmp, slope, constant; |
86 | unsigned long 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 EV |
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 | ||
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 EV |
148 | THERMAL_NO_LIMIT, |
149 | THERMAL_NO_LIMIT); | |
445eaf87 EV |
150 | } |
151 | ||
152 | /* Unbind callback functions for thermal zone */ | |
03e859d3 EV |
153 | static int ti_thermal_unbind(struct thermal_zone_device *thermal, |
154 | struct thermal_cooling_device *cdev) | |
445eaf87 | 155 | { |
03e859d3 | 156 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 | 157 | |
0c12b5ac | 158 | if (!data || IS_ERR(data)) |
445eaf87 EV |
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 */ | |
03e859d3 EV |
170 | static int ti_thermal_get_mode(struct thermal_zone_device *thermal, |
171 | enum thermal_device_mode *mode) | |
445eaf87 | 172 | { |
03e859d3 | 173 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 EV |
174 | |
175 | if (data) | |
176 | *mode = data->mode; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | /* Set mode callback functions for thermal zone */ | |
03e859d3 EV |
182 | static int ti_thermal_set_mode(struct thermal_zone_device *thermal, |
183 | enum thermal_device_mode mode) | |
445eaf87 | 184 | { |
03e859d3 | 185 | struct ti_thermal_data *data = thermal->devdata; |
10ccff1b RK |
186 | struct ti_bandgap *bgp; |
187 | ||
188 | bgp = data->bgp; | |
445eaf87 | 189 | |
03e859d3 | 190 | if (!data->ti_thermal) { |
445eaf87 EV |
191 | dev_notice(&thermal->device, "thermal zone not registered\n"); |
192 | return 0; | |
193 | } | |
194 | ||
03e859d3 | 195 | mutex_lock(&data->ti_thermal->lock); |
445eaf87 EV |
196 | |
197 | if (mode == THERMAL_DEVICE_ENABLED) | |
03e859d3 | 198 | data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; |
445eaf87 | 199 | else |
03e859d3 | 200 | data->ti_thermal->polling_delay = 0; |
445eaf87 | 201 | |
03e859d3 | 202 | mutex_unlock(&data->ti_thermal->lock); |
445eaf87 EV |
203 | |
204 | data->mode = mode; | |
10ccff1b RK |
205 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
206 | data->ti_thermal->polling_delay); | |
03e859d3 | 207 | thermal_zone_device_update(data->ti_thermal); |
445eaf87 | 208 | dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n", |
03e859d3 | 209 | data->ti_thermal->polling_delay); |
445eaf87 EV |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Get trip type callback functions for thermal zone */ | |
03e859d3 EV |
215 | static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal, |
216 | int trip, enum thermal_trip_type *type) | |
445eaf87 | 217 | { |
03e859d3 | 218 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
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 */ | |
03e859d3 EV |
230 | static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal, |
231 | int trip, unsigned long *temp) | |
445eaf87 | 232 | { |
03e859d3 | 233 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
234 | return -EINVAL; |
235 | ||
03e859d3 | 236 | *temp = ti_thermal_get_trip_value(trip); |
445eaf87 EV |
237 | |
238 | return 0; | |
239 | } | |
240 | ||
26d9cc65 | 241 | static int __ti_thermal_get_trend(void *p, long *trend) |
03b7f67b | 242 | { |
26d9cc65 | 243 | struct ti_thermal_data *data = p; |
03b7f67b K |
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 | ||
26d9cc65 EV |
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 | ||
03b7f67b K |
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 | ||
445eaf87 | 280 | /* Get critical temperature callback functions for thermal zone */ |
03e859d3 EV |
281 | static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal, |
282 | unsigned long *temp) | |
445eaf87 EV |
283 | { |
284 | /* shutdown zone */ | |
03e859d3 | 285 | return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp); |
445eaf87 EV |
286 | } |
287 | ||
2251aef6 EV |
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 | ||
03e859d3 EV |
293 | static struct thermal_zone_device_ops ti_thermal_ops = { |
294 | .get_temp = ti_thermal_get_temp, | |
03b7f67b | 295 | .get_trend = ti_thermal_get_trend, |
03e859d3 EV |
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, | |
445eaf87 EV |
303 | }; |
304 | ||
03e859d3 EV |
305 | static struct ti_thermal_data |
306 | *ti_thermal_build_data(struct ti_bandgap *bgp, int id) | |
445eaf87 | 307 | { |
03e859d3 | 308 | struct ti_thermal_data *data; |
445eaf87 | 309 | |
d7f080e6 | 310 | data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); |
445eaf87 | 311 | if (!data) { |
d7f080e6 | 312 | dev_err(bgp->dev, "kzalloc fail\n"); |
04a4d10d | 313 | return NULL; |
445eaf87 EV |
314 | } |
315 | data->sensor_id = id; | |
d7f080e6 | 316 | data->bgp = bgp; |
445eaf87 | 317 | data->mode = THERMAL_DEVICE_ENABLED; |
0c12b5ac | 318 | /* pcb_tz will be either valid or PTR_ERR() */ |
359836e1 | 319 | data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); |
03e859d3 | 320 | INIT_WORK(&data->thermal_wq, ti_thermal_work); |
445eaf87 | 321 | |
04a4d10d EV |
322 | return data; |
323 | } | |
324 | ||
03e859d3 EV |
325 | int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, |
326 | char *domain) | |
04a4d10d | 327 | { |
03e859d3 | 328 | struct ti_thermal_data *data; |
04a4d10d | 329 | |
03e859d3 | 330 | data = ti_bandgap_get_sensor_data(bgp, id); |
04a4d10d | 331 | |
0c12b5ac | 332 | if (!data || IS_ERR(data)) |
03e859d3 | 333 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
334 | |
335 | if (!data) | |
336 | return -EINVAL; | |
337 | ||
26d9cc65 EV |
338 | /* in case this is specified by DT */ |
339 | data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id, | |
2251aef6 | 340 | data, &ti_of_thermal_ops); |
26d9cc65 EV |
341 | if (IS_ERR(data->ti_thermal)) { |
342 | /* Create thermal zone */ | |
343 | data->ti_thermal = thermal_zone_device_register(domain, | |
03e859d3 | 344 | OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops, |
50125a9b | 345 | NULL, FAST_TEMP_MONITORING_RATE, |
765a1939 | 346 | FAST_TEMP_MONITORING_RATE); |
26d9cc65 EV |
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; | |
445eaf87 | 353 | } |
03e859d3 | 354 | ti_bandgap_set_sensor_data(bgp, id, data); |
10ccff1b RK |
355 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
356 | data->ti_thermal->polling_delay); | |
445eaf87 EV |
357 | |
358 | return 0; | |
359 | } | |
360 | ||
03e859d3 | 361 | int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) |
445eaf87 | 362 | { |
03e859d3 | 363 | struct ti_thermal_data *data; |
445eaf87 | 364 | |
03e859d3 | 365 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 | 366 | |
26d9cc65 EV |
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 | } | |
445eaf87 EV |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
03e859d3 | 378 | int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) |
445eaf87 | 379 | { |
03e859d3 | 380 | struct ti_thermal_data *data; |
445eaf87 | 381 | |
03e859d3 | 382 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
383 | |
384 | schedule_work(&data->thermal_wq); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
03e859d3 | 389 | int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 390 | { |
03e859d3 | 391 | struct ti_thermal_data *data; |
26d9cc65 EV |
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; | |
445eaf87 | 401 | |
03e859d3 | 402 | data = ti_bandgap_get_sensor_data(bgp, id); |
0c12b5ac | 403 | if (!data || IS_ERR(data)) |
03e859d3 | 404 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
405 | |
406 | if (!data) | |
407 | return -EINVAL; | |
445eaf87 | 408 | |
445eaf87 | 409 | /* Register cooling device */ |
5035d48d | 410 | data->cool_dev = cpufreq_cooling_register(cpu_present_mask); |
0c12b5ac | 411 | if (IS_ERR(data->cool_dev)) { |
cffafc32 EV |
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; | |
445eaf87 | 420 | } |
03e859d3 | 421 | ti_bandgap_set_sensor_data(bgp, id, data); |
445eaf87 EV |
422 | |
423 | return 0; | |
424 | } | |
425 | ||
03e859d3 | 426 | int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 427 | { |
03e859d3 | 428 | struct ti_thermal_data *data; |
445eaf87 | 429 | |
03e859d3 | 430 | data = ti_bandgap_get_sensor_data(bgp, id); |
26d9cc65 EV |
431 | |
432 | if (data && data->cool_dev) | |
433 | cpufreq_cooling_unregister(data->cool_dev); | |
445eaf87 EV |
434 | |
435 | return 0; | |
436 | } |