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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> | |
31 | #include <linux/cpufreq.h> | |
32 | #include <linux/cpu_cooling.h> | |
33 | ||
34 | #include "omap-thermal.h" | |
35 | #include "omap-bandgap.h" | |
36 | ||
37 | /* common data structures */ | |
38 | struct omap_thermal_data { | |
39 | struct thermal_zone_device *omap_thermal; | |
40 | struct thermal_cooling_device *cool_dev; | |
41 | struct omap_bandgap *bg_ptr; | |
42 | enum thermal_device_mode mode; | |
43 | struct work_struct thermal_wq; | |
44 | int sensor_id; | |
45 | }; | |
46 | ||
47 | static void omap_thermal_work(struct work_struct *work) | |
48 | { | |
49 | struct omap_thermal_data *data = container_of(work, | |
50 | struct omap_thermal_data, thermal_wq); | |
51 | ||
52 | thermal_zone_device_update(data->omap_thermal); | |
53 | ||
54 | dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n", | |
55 | data->omap_thermal->type); | |
56 | } | |
57 | ||
58 | /** | |
59 | * omap_thermal_hotspot_temperature - returns sensor extrapolated temperature | |
60 | * @t: omap sensor temperature | |
61 | * @s: omap sensor slope value | |
62 | * @c: omap sensor const value | |
63 | */ | |
64 | static inline int omap_thermal_hotspot_temperature(int t, int s, int c) | |
65 | { | |
66 | int delta = t * s / 1000 + c; | |
67 | ||
68 | if (delta < 0) | |
69 | delta = 0; | |
70 | ||
71 | return t + delta; | |
72 | } | |
73 | ||
74 | /* thermal zone ops */ | |
75 | /* Get temperature callback function for thermal zone*/ | |
76 | static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal, | |
77 | unsigned long *temp) | |
78 | { | |
79 | struct omap_thermal_data *data = thermal->devdata; | |
80 | struct omap_bandgap *bg_ptr = data->bg_ptr; | |
81 | struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id]; | |
82 | int ret, tmp, pcb_temp, slope, constant; | |
83 | ||
84 | ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp); | |
85 | if (ret) | |
86 | return ret; | |
87 | ||
88 | pcb_temp = 0; | |
89 | /* TODO: Introduce pcb temperature lookup */ | |
90 | /* In case pcb zone is available, use the extrapolation rule with it */ | |
91 | if (pcb_temp) { | |
92 | tmp -= pcb_temp; | |
93 | slope = s->slope_pcb; | |
94 | constant = s->constant_pcb; | |
95 | } else { | |
96 | slope = s->slope; | |
97 | constant = s->constant; | |
98 | } | |
99 | *temp = omap_thermal_hotspot_temperature(tmp, slope, constant); | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | /* Bind callback functions for thermal zone */ | |
105 | static int omap_thermal_bind(struct thermal_zone_device *thermal, | |
106 | struct thermal_cooling_device *cdev) | |
107 | { | |
108 | struct omap_thermal_data *data = thermal->devdata; | |
109 | int max, id; | |
110 | ||
111 | if (IS_ERR_OR_NULL(data)) | |
112 | return -ENODEV; | |
113 | ||
114 | /* check if this is the cooling device we registered */ | |
115 | if (data->cool_dev != cdev) | |
116 | return 0; | |
117 | ||
118 | id = data->sensor_id; | |
119 | max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count; | |
120 | ||
121 | /* TODO: bind with min and max states */ | |
122 | /* Simple thing, two trips, one passive another critical */ | |
123 | return thermal_zone_bind_cooling_device(thermal, 0, cdev); | |
124 | } | |
125 | ||
126 | /* Unbind callback functions for thermal zone */ | |
127 | static int omap_thermal_unbind(struct thermal_zone_device *thermal, | |
128 | struct thermal_cooling_device *cdev) | |
129 | { | |
130 | struct omap_thermal_data *data = thermal->devdata; | |
131 | ||
132 | if (IS_ERR_OR_NULL(data)) | |
133 | return -ENODEV; | |
134 | ||
135 | /* check if this is the cooling device we registered */ | |
136 | if (data->cool_dev != cdev) | |
137 | return 0; | |
138 | ||
139 | /* Simple thing, two trips, one passive another critical */ | |
140 | return thermal_zone_unbind_cooling_device(thermal, 0, cdev); | |
141 | } | |
142 | ||
143 | /* Get mode callback functions for thermal zone */ | |
144 | static int omap_thermal_get_mode(struct thermal_zone_device *thermal, | |
145 | enum thermal_device_mode *mode) | |
146 | { | |
147 | struct omap_thermal_data *data = thermal->devdata; | |
148 | ||
149 | if (data) | |
150 | *mode = data->mode; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | /* Set mode callback functions for thermal zone */ | |
156 | static int omap_thermal_set_mode(struct thermal_zone_device *thermal, | |
157 | enum thermal_device_mode mode) | |
158 | { | |
159 | struct omap_thermal_data *data = thermal->devdata; | |
160 | ||
161 | if (!data->omap_thermal) { | |
162 | dev_notice(&thermal->device, "thermal zone not registered\n"); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | mutex_lock(&data->omap_thermal->lock); | |
167 | ||
168 | if (mode == THERMAL_DEVICE_ENABLED) | |
169 | data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; | |
170 | else | |
171 | data->omap_thermal->polling_delay = 0; | |
172 | ||
173 | mutex_unlock(&data->omap_thermal->lock); | |
174 | ||
175 | data->mode = mode; | |
176 | thermal_zone_device_update(data->omap_thermal); | |
177 | dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n", | |
178 | data->omap_thermal->polling_delay); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | /* Get trip type callback functions for thermal zone */ | |
184 | static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal, | |
185 | int trip, enum thermal_trip_type *type) | |
186 | { | |
187 | if (!omap_thermal_is_valid_trip(trip)) | |
188 | return -EINVAL; | |
189 | ||
190 | if (trip + 1 == OMAP_TRIP_NUMBER) | |
191 | *type = THERMAL_TRIP_CRITICAL; | |
192 | else | |
193 | *type = THERMAL_TRIP_PASSIVE; | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /* Get trip temperature callback functions for thermal zone */ | |
199 | static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal, | |
200 | int trip, unsigned long *temp) | |
201 | { | |
202 | if (!omap_thermal_is_valid_trip(trip)) | |
203 | return -EINVAL; | |
204 | ||
205 | *temp = omap_thermal_get_trip_value(trip); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /* Get critical temperature callback functions for thermal zone */ | |
211 | static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal, | |
212 | unsigned long *temp) | |
213 | { | |
214 | /* shutdown zone */ | |
215 | return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp); | |
216 | } | |
217 | ||
218 | static struct thermal_zone_device_ops omap_thermal_ops = { | |
219 | .get_temp = omap_thermal_get_temp, | |
220 | /* TODO: add .get_trend */ | |
221 | .bind = omap_thermal_bind, | |
222 | .unbind = omap_thermal_unbind, | |
223 | .get_mode = omap_thermal_get_mode, | |
224 | .set_mode = omap_thermal_set_mode, | |
225 | .get_trip_type = omap_thermal_get_trip_type, | |
226 | .get_trip_temp = omap_thermal_get_trip_temp, | |
227 | .get_crit_temp = omap_thermal_get_crit_temp, | |
228 | }; | |
229 | ||
230 | int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id, | |
231 | char *domain) | |
232 | { | |
233 | struct omap_thermal_data *data; | |
234 | ||
235 | data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL); | |
236 | if (!data) { | |
237 | dev_err(bg_ptr->dev, "kzalloc fail\n"); | |
238 | return -ENOMEM; | |
239 | } | |
240 | data->sensor_id = id; | |
241 | data->bg_ptr = bg_ptr; | |
242 | data->mode = THERMAL_DEVICE_ENABLED; | |
243 | INIT_WORK(&data->thermal_wq, omap_thermal_work); | |
244 | ||
245 | /* TODO: remove TC1 TC2 */ | |
246 | /* Create thermal zone */ | |
247 | data->omap_thermal = thermal_zone_device_register(domain, | |
248 | OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops, | |
1b7ddb84 | 249 | 0, FAST_TEMP_MONITORING_RATE); |
445eaf87 EV |
250 | if (IS_ERR_OR_NULL(data->omap_thermal)) { |
251 | dev_err(bg_ptr->dev, "thermal zone device is NULL\n"); | |
252 | return PTR_ERR(data->omap_thermal); | |
253 | } | |
254 | data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; | |
255 | omap_bandgap_set_sensor_data(bg_ptr, id, data); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id) | |
261 | { | |
262 | struct omap_thermal_data *data; | |
263 | ||
264 | data = omap_bandgap_get_sensor_data(bg_ptr, id); | |
265 | ||
266 | thermal_zone_device_unregister(data->omap_thermal); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id) | |
272 | { | |
273 | struct omap_thermal_data *data; | |
274 | ||
275 | data = omap_bandgap_get_sensor_data(bg_ptr, id); | |
276 | ||
277 | schedule_work(&data->thermal_wq); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr, | |
283 | struct freq_clip_table **tab_ptr, | |
284 | int *tab_size) | |
285 | { | |
286 | struct cpufreq_frequency_table *freq_table; | |
287 | struct freq_clip_table *tab; | |
288 | int i, count = 0; | |
289 | ||
290 | freq_table = cpufreq_frequency_get_table(0); | |
291 | if (IS_ERR_OR_NULL(freq_table)) { | |
292 | dev_err(bg_ptr->dev, | |
293 | "%s: failed to get cpufreq table (%p)\n", | |
294 | __func__, freq_table); | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
298 | for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
299 | unsigned int freq = freq_table[i].frequency; | |
300 | if (freq == CPUFREQ_ENTRY_INVALID) | |
301 | continue; | |
302 | count++; | |
303 | } | |
304 | ||
305 | tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL); | |
306 | if (!tab) { | |
307 | dev_err(bg_ptr->dev, | |
308 | "%s: no memory available\n", __func__); | |
309 | return -ENOMEM; | |
310 | } | |
311 | ||
312 | for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
313 | unsigned int freq = freq_table[i].frequency; | |
314 | ||
315 | if (freq == CPUFREQ_ENTRY_INVALID) | |
316 | continue; | |
317 | ||
318 | tab[count - i - 1].freq_clip_max = freq; | |
319 | tab[count - i - 1].temp_level = OMAP_TRIP_HOT; | |
320 | tab[count - i - 1].mask_val = cpumask_of(0); | |
321 | } | |
322 | ||
323 | *tab_ptr = tab; | |
324 | *tab_size = count; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id) | |
330 | { | |
331 | struct omap_thermal_data *data; | |
332 | struct freq_clip_table *tab_ptr; | |
333 | int tab_size, ret; | |
334 | ||
335 | data = omap_bandgap_get_sensor_data(bg_ptr, id); | |
336 | ||
337 | ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size); | |
338 | if (ret < 0) { | |
339 | dev_err(bg_ptr->dev, | |
340 | "%s: failed to build cpufreq clip table\n", __func__); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | /* Register cooling device */ | |
345 | data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size); | |
346 | if (IS_ERR_OR_NULL(data->cool_dev)) { | |
347 | dev_err(bg_ptr->dev, | |
348 | "Failed to register cpufreq cooling device\n"); | |
349 | return PTR_ERR(data->cool_dev); | |
350 | } | |
351 | bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size; | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id) | |
357 | { | |
358 | struct omap_thermal_data *data; | |
359 | ||
360 | data = omap_bandgap_get_sensor_data(bg_ptr, id); | |
361 | cpufreq_cooling_unregister(data->cool_dev); | |
362 | ||
363 | return 0; | |
364 | } |