1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright 2013 Freescale Semiconductor, Inc.
4
5 #include <linux/clk.h>
6 #include <linux/cpufreq.h>
7 #include <linux/cpu_cooling.h>
8 #include <linux/delay.h>
9 #include <linux/interrupt.h>
10 #include <linux/io.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15 #include <linux/regmap.h>
16 #include <linux/thermal.h>
17 #include <linux/nvmem-consumer.h>
18 #include <linux/pm_runtime.h>
19
20 #define REG_SET 0x4
21 #define REG_CLR 0x8
22 #define REG_TOG 0xc
23
24 /* i.MX6 specific */
25 #define IMX6_MISC0 0x0150
26 #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3)
27 #define IMX6_MISC1 0x0160
28 #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29)
29 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
30 #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28)
31 #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27)
32
33 #define IMX6_TEMPSENSE0 0x0180
34 #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20
35 #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)
36 #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8
37 #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)
38 #define IMX6_TEMPSENSE0_FINISHED (1 << 2)
39 #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)
40 #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)
41
42 #define IMX6_TEMPSENSE1 0x0190
43 #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
44 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
45
46 #define OCOTP_MEM0 0x0480
47 #define OCOTP_ANA1 0x04e0
48
49 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
50 #define IMX6_TEMPSENSE2 0x0290
51 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0
52 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff
53 #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16
54 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
55
56 /* i.MX7 specific */
57 #define IMX7_ANADIG_DIGPROG 0x800
58 #define IMX7_TEMPSENSE0 0x300
59 #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18
60 #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)
61 #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9
62 #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)
63 #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0
64 #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff
65
66 #define IMX7_TEMPSENSE1 0x310
67 #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16
68 #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)
69 #define IMX7_TEMPSENSE1_FINISHED (1 << 11)
70 #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)
71 #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)
72 #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0
73 #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff
74
75 /* The driver supports 1 passive trip point and 1 critical trip point */
76 enum imx_thermal_trip {
77 IMX_TRIP_PASSIVE,
78 IMX_TRIP_CRITICAL,
79 IMX_TRIP_NUM,
80 };
81
82 #define IMX_POLLING_DELAY 2000 /* millisecond */
83 #define IMX_PASSIVE_DELAY 1000
84
85 #define TEMPMON_IMX6Q 1
86 #define TEMPMON_IMX6SX 2
87 #define TEMPMON_IMX7D 3
88
89 struct thermal_soc_data {
90 u32 version;
91
92 u32 sensor_ctrl;
93 u32 power_down_mask;
94 u32 measure_temp_mask;
95
96 u32 measure_freq_ctrl;
97 u32 measure_freq_mask;
98 u32 measure_freq_shift;
99
100 u32 temp_data;
101 u32 temp_value_mask;
102 u32 temp_value_shift;
103 u32 temp_valid_mask;
104
105 u32 panic_alarm_ctrl;
106 u32 panic_alarm_mask;
107 u32 panic_alarm_shift;
108
109 u32 high_alarm_ctrl;
110 u32 high_alarm_mask;
111 u32 high_alarm_shift;
112
113 u32 low_alarm_ctrl;
114 u32 low_alarm_mask;
115 u32 low_alarm_shift;
116 };
117
118 static struct thermal_soc_data thermal_imx6q_data = {
119 .version = TEMPMON_IMX6Q,
120
121 .sensor_ctrl = IMX6_TEMPSENSE0,
122 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
123 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
124
125 .measure_freq_ctrl = IMX6_TEMPSENSE1,
126 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
127 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
128
129 .temp_data = IMX6_TEMPSENSE0,
130 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
131 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
132 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
133
134 .high_alarm_ctrl = IMX6_TEMPSENSE0,
135 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
136 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
137 };
138
139 static struct thermal_soc_data thermal_imx6sx_data = {
140 .version = TEMPMON_IMX6SX,
141
142 .sensor_ctrl = IMX6_TEMPSENSE0,
143 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
144 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
145
146 .measure_freq_ctrl = IMX6_TEMPSENSE1,
147 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
148 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
149
150 .temp_data = IMX6_TEMPSENSE0,
151 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
152 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
153 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
154
155 .high_alarm_ctrl = IMX6_TEMPSENSE0,
156 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
157 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
158
159 .panic_alarm_ctrl = IMX6_TEMPSENSE2,
160 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
161 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
162
163 .low_alarm_ctrl = IMX6_TEMPSENSE2,
164 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
165 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
166 };
167
168 static struct thermal_soc_data thermal_imx7d_data = {
169 .version = TEMPMON_IMX7D,
170
171 .sensor_ctrl = IMX7_TEMPSENSE1,
172 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
173 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
174
175 .measure_freq_ctrl = IMX7_TEMPSENSE1,
176 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
177 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
178
179 .temp_data = IMX7_TEMPSENSE1,
180 .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
181 .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
182 .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
183
184 .panic_alarm_ctrl = IMX7_TEMPSENSE1,
185 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
186 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
187
188 .high_alarm_ctrl = IMX7_TEMPSENSE0,
189 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
190 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
191
192 .low_alarm_ctrl = IMX7_TEMPSENSE0,
193 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
194 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
195 };
196
197 struct imx_thermal_data {
198 struct device *dev;
199 struct cpufreq_policy *policy;
200 struct thermal_zone_device *tz;
201 struct thermal_cooling_device *cdev;
202 struct regmap *tempmon;
203 u32 c1, c2; /* See formula in imx_init_calib() */
204 int temp_passive;
205 int temp_critical;
206 int temp_max;
207 int alarm_temp;
208 int last_temp;
209 bool irq_enabled;
210 int irq;
211 struct clk *thermal_clk;
212 const struct thermal_soc_data *socdata;
213 const char *temp_grade;
214 };
215
imx_set_panic_temp(struct imx_thermal_data * data,int panic_temp)216 static void imx_set_panic_temp(struct imx_thermal_data *data,
217 int panic_temp)
218 {
219 const struct thermal_soc_data *soc_data = data->socdata;
220 struct regmap *map = data->tempmon;
221 int critical_value;
222
223 critical_value = (data->c2 - panic_temp) / data->c1;
224
225 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
226 soc_data->panic_alarm_mask);
227 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
228 critical_value << soc_data->panic_alarm_shift);
229 }
230
imx_set_alarm_temp(struct imx_thermal_data * data,int alarm_temp)231 static void imx_set_alarm_temp(struct imx_thermal_data *data,
232 int alarm_temp)
233 {
234 struct regmap *map = data->tempmon;
235 const struct thermal_soc_data *soc_data = data->socdata;
236 int alarm_value;
237
238 data->alarm_temp = alarm_temp;
239
240 if (data->socdata->version == TEMPMON_IMX7D)
241 alarm_value = alarm_temp / 1000 + data->c1 - 25;
242 else
243 alarm_value = (data->c2 - alarm_temp) / data->c1;
244
245 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
246 soc_data->high_alarm_mask);
247 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
248 alarm_value << soc_data->high_alarm_shift);
249 }
250
imx_get_temp(struct thermal_zone_device * tz,int * temp)251 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
252 {
253 struct imx_thermal_data *data = tz->devdata;
254 const struct thermal_soc_data *soc_data = data->socdata;
255 struct regmap *map = data->tempmon;
256 unsigned int n_meas;
257 u32 val;
258 int ret;
259
260 ret = pm_runtime_resume_and_get(data->dev);
261 if (ret < 0)
262 return ret;
263
264 regmap_read(map, soc_data->temp_data, &val);
265
266 if ((val & soc_data->temp_valid_mask) == 0) {
267 dev_dbg(&tz->device, "temp measurement never finished\n");
268 return -EAGAIN;
269 }
270
271 n_meas = (val & soc_data->temp_value_mask)
272 >> soc_data->temp_value_shift;
273
274 /* See imx_init_calib() for formula derivation */
275 if (data->socdata->version == TEMPMON_IMX7D)
276 *temp = (n_meas - data->c1 + 25) * 1000;
277 else
278 *temp = data->c2 - n_meas * data->c1;
279
280 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
281 if (data->socdata->version == TEMPMON_IMX6Q) {
282 if (data->alarm_temp == data->temp_passive &&
283 *temp >= data->temp_passive)
284 imx_set_alarm_temp(data, data->temp_critical);
285 if (data->alarm_temp == data->temp_critical &&
286 *temp < data->temp_passive) {
287 imx_set_alarm_temp(data, data->temp_passive);
288 dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
289 data->alarm_temp / 1000);
290 }
291 }
292
293 if (*temp != data->last_temp) {
294 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
295 data->last_temp = *temp;
296 }
297
298 /* Reenable alarm IRQ if temperature below alarm temperature */
299 if (!data->irq_enabled && *temp < data->alarm_temp) {
300 data->irq_enabled = true;
301 enable_irq(data->irq);
302 }
303
304 pm_runtime_put(data->dev);
305
306 return 0;
307 }
308
imx_change_mode(struct thermal_zone_device * tz,enum thermal_device_mode mode)309 static int imx_change_mode(struct thermal_zone_device *tz,
310 enum thermal_device_mode mode)
311 {
312 struct imx_thermal_data *data = tz->devdata;
313
314 if (mode == THERMAL_DEVICE_ENABLED) {
315 pm_runtime_get(data->dev);
316
317 if (!data->irq_enabled) {
318 data->irq_enabled = true;
319 enable_irq(data->irq);
320 }
321 } else {
322 pm_runtime_put(data->dev);
323
324 if (data->irq_enabled) {
325 disable_irq(data->irq);
326 data->irq_enabled = false;
327 }
328 }
329
330 return 0;
331 }
332
imx_get_trip_type(struct thermal_zone_device * tz,int trip,enum thermal_trip_type * type)333 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
334 enum thermal_trip_type *type)
335 {
336 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
337 THERMAL_TRIP_CRITICAL;
338 return 0;
339 }
340
imx_get_crit_temp(struct thermal_zone_device * tz,int * temp)341 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
342 {
343 struct imx_thermal_data *data = tz->devdata;
344
345 *temp = data->temp_critical;
346 return 0;
347 }
348
imx_get_trip_temp(struct thermal_zone_device * tz,int trip,int * temp)349 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
350 int *temp)
351 {
352 struct imx_thermal_data *data = tz->devdata;
353
354 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
355 data->temp_critical;
356 return 0;
357 }
358
imx_set_trip_temp(struct thermal_zone_device * tz,int trip,int temp)359 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
360 int temp)
361 {
362 struct imx_thermal_data *data = tz->devdata;
363 int ret;
364
365 ret = pm_runtime_resume_and_get(data->dev);
366 if (ret < 0)
367 return ret;
368
369 /* do not allow changing critical threshold */
370 if (trip == IMX_TRIP_CRITICAL)
371 return -EPERM;
372
373 /* do not allow passive to be set higher than critical */
374 if (temp < 0 || temp > data->temp_critical)
375 return -EINVAL;
376
377 data->temp_passive = temp;
378
379 imx_set_alarm_temp(data, temp);
380
381 pm_runtime_put(data->dev);
382
383 return 0;
384 }
385
imx_bind(struct thermal_zone_device * tz,struct thermal_cooling_device * cdev)386 static int imx_bind(struct thermal_zone_device *tz,
387 struct thermal_cooling_device *cdev)
388 {
389 int ret;
390
391 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
392 THERMAL_NO_LIMIT,
393 THERMAL_NO_LIMIT,
394 THERMAL_WEIGHT_DEFAULT);
395 if (ret) {
396 dev_err(&tz->device,
397 "binding zone %s with cdev %s failed:%d\n",
398 tz->type, cdev->type, ret);
399 return ret;
400 }
401
402 return 0;
403 }
404
imx_unbind(struct thermal_zone_device * tz,struct thermal_cooling_device * cdev)405 static int imx_unbind(struct thermal_zone_device *tz,
406 struct thermal_cooling_device *cdev)
407 {
408 int ret;
409
410 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
411 if (ret) {
412 dev_err(&tz->device,
413 "unbinding zone %s with cdev %s failed:%d\n",
414 tz->type, cdev->type, ret);
415 return ret;
416 }
417
418 return 0;
419 }
420
421 static struct thermal_zone_device_ops imx_tz_ops = {
422 .bind = imx_bind,
423 .unbind = imx_unbind,
424 .get_temp = imx_get_temp,
425 .change_mode = imx_change_mode,
426 .get_trip_type = imx_get_trip_type,
427 .get_trip_temp = imx_get_trip_temp,
428 .get_crit_temp = imx_get_crit_temp,
429 .set_trip_temp = imx_set_trip_temp,
430 };
431
imx_init_calib(struct platform_device * pdev,u32 ocotp_ana1)432 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
433 {
434 struct imx_thermal_data *data = platform_get_drvdata(pdev);
435 int n1;
436 u64 temp64;
437
438 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
439 dev_err(&pdev->dev, "invalid sensor calibration data\n");
440 return -EINVAL;
441 }
442
443 /*
444 * On i.MX7D, we only use the calibration data at 25C to get the temp,
445 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
446 */
447 if (data->socdata->version == TEMPMON_IMX7D) {
448 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
449 return 0;
450 }
451
452 /*
453 * The sensor is calibrated at 25 °C (aka T1) and the value measured
454 * (aka N1) at this temperature is provided in bits [31:20] in the
455 * i.MX's OCOTP value ANA1.
456 * To find the actual temperature T, the following formula has to be used
457 * when reading value n from the sensor:
458 *
459 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
460 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
461 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
462 * = c2 - c1 * N
463 *
464 * with
465 *
466 * T1' = 28.580661 °C
467 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
468 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
469 * = T1' + N1 * c1
470 */
471 n1 = ocotp_ana1 >> 20;
472
473 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
474 temp64 *= 1000; /* to get result in °mC */
475 do_div(temp64, 15423 * n1 - 4148468);
476 data->c1 = temp64;
477 data->c2 = n1 * data->c1 + 28581;
478
479 return 0;
480 }
481
imx_init_temp_grade(struct platform_device * pdev,u32 ocotp_mem0)482 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
483 {
484 struct imx_thermal_data *data = platform_get_drvdata(pdev);
485
486 /* The maximum die temp is specified by the Temperature Grade */
487 switch ((ocotp_mem0 >> 6) & 0x3) {
488 case 0: /* Commercial (0 to 95 °C) */
489 data->temp_grade = "Commercial";
490 data->temp_max = 95000;
491 break;
492 case 1: /* Extended Commercial (-20 °C to 105 °C) */
493 data->temp_grade = "Extended Commercial";
494 data->temp_max = 105000;
495 break;
496 case 2: /* Industrial (-40 °C to 105 °C) */
497 data->temp_grade = "Industrial";
498 data->temp_max = 105000;
499 break;
500 case 3: /* Automotive (-40 °C to 125 °C) */
501 data->temp_grade = "Automotive";
502 data->temp_max = 125000;
503 break;
504 }
505
506 /*
507 * Set the critical trip point at 5 °C under max
508 * Set the passive trip point at 10 °C under max (changeable via sysfs)
509 */
510 data->temp_critical = data->temp_max - (1000 * 5);
511 data->temp_passive = data->temp_max - (1000 * 10);
512 }
513
imx_init_from_tempmon_data(struct platform_device * pdev)514 static int imx_init_from_tempmon_data(struct platform_device *pdev)
515 {
516 struct regmap *map;
517 int ret;
518 u32 val;
519
520 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
521 "fsl,tempmon-data");
522 if (IS_ERR(map)) {
523 ret = PTR_ERR(map);
524 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
525 return ret;
526 }
527
528 ret = regmap_read(map, OCOTP_ANA1, &val);
529 if (ret) {
530 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
531 return ret;
532 }
533 ret = imx_init_calib(pdev, val);
534 if (ret)
535 return ret;
536
537 ret = regmap_read(map, OCOTP_MEM0, &val);
538 if (ret) {
539 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
540 return ret;
541 }
542 imx_init_temp_grade(pdev, val);
543
544 return 0;
545 }
546
imx_init_from_nvmem_cells(struct platform_device * pdev)547 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
548 {
549 int ret;
550 u32 val;
551
552 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
553 if (ret)
554 return ret;
555
556 ret = imx_init_calib(pdev, val);
557 if (ret)
558 return ret;
559
560 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
561 if (ret)
562 return ret;
563 imx_init_temp_grade(pdev, val);
564
565 return 0;
566 }
567
imx_thermal_alarm_irq(int irq,void * dev)568 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
569 {
570 struct imx_thermal_data *data = dev;
571
572 disable_irq_nosync(irq);
573 data->irq_enabled = false;
574
575 return IRQ_WAKE_THREAD;
576 }
577
imx_thermal_alarm_irq_thread(int irq,void * dev)578 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
579 {
580 struct imx_thermal_data *data = dev;
581
582 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
583 data->alarm_temp / 1000);
584
585 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
586
587 return IRQ_HANDLED;
588 }
589
590 static const struct of_device_id of_imx_thermal_match[] = {
591 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
592 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
593 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
594 { /* end */ }
595 };
596 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
597
598 #ifdef CONFIG_CPU_FREQ
599 /*
600 * Create cooling device in case no #cooling-cells property is available in
601 * CPU node
602 */
imx_thermal_register_legacy_cooling(struct imx_thermal_data * data)603 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
604 {
605 struct device_node *np;
606 int ret = 0;
607
608 data->policy = cpufreq_cpu_get(0);
609 if (!data->policy) {
610 pr_debug("%s: CPUFreq policy not found\n", __func__);
611 return -EPROBE_DEFER;
612 }
613
614 np = of_get_cpu_node(data->policy->cpu, NULL);
615
616 if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
617 data->cdev = cpufreq_cooling_register(data->policy);
618 if (IS_ERR(data->cdev)) {
619 ret = PTR_ERR(data->cdev);
620 cpufreq_cpu_put(data->policy);
621 }
622 }
623
624 of_node_put(np);
625
626 return ret;
627 }
628
imx_thermal_unregister_legacy_cooling(struct imx_thermal_data * data)629 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
630 {
631 cpufreq_cooling_unregister(data->cdev);
632 cpufreq_cpu_put(data->policy);
633 }
634
635 #else
636
imx_thermal_register_legacy_cooling(struct imx_thermal_data * data)637 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
638 {
639 return 0;
640 }
641
imx_thermal_unregister_legacy_cooling(struct imx_thermal_data * data)642 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
643 {
644 }
645 #endif
646
imx_thermal_probe(struct platform_device * pdev)647 static int imx_thermal_probe(struct platform_device *pdev)
648 {
649 struct imx_thermal_data *data;
650 struct regmap *map;
651 int measure_freq;
652 int ret;
653
654 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
655 if (!data)
656 return -ENOMEM;
657
658 data->dev = &pdev->dev;
659
660 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
661 if (IS_ERR(map)) {
662 ret = PTR_ERR(map);
663 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
664 return ret;
665 }
666 data->tempmon = map;
667
668 data->socdata = of_device_get_match_data(&pdev->dev);
669 if (!data->socdata) {
670 dev_err(&pdev->dev, "no device match found\n");
671 return -ENODEV;
672 }
673
674 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
675 if (data->socdata->version == TEMPMON_IMX6SX) {
676 regmap_write(map, IMX6_MISC1 + REG_CLR,
677 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
678 | IMX6_MISC1_IRQ_TEMPPANIC);
679 /*
680 * reset value of LOW ALARM is incorrect, set it to lowest
681 * value to avoid false trigger of low alarm.
682 */
683 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
684 data->socdata->low_alarm_mask);
685 }
686
687 data->irq = platform_get_irq(pdev, 0);
688 if (data->irq < 0)
689 return data->irq;
690
691 platform_set_drvdata(pdev, data);
692
693 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
694 ret = imx_init_from_nvmem_cells(pdev);
695 if (ret)
696 return dev_err_probe(&pdev->dev, ret,
697 "failed to init from nvmem\n");
698 } else {
699 ret = imx_init_from_tempmon_data(pdev);
700 if (ret) {
701 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
702 return ret;
703 }
704 }
705
706 /* Make sure sensor is in known good state for measurements */
707 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
708 data->socdata->power_down_mask);
709 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
710 data->socdata->measure_temp_mask);
711 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
712 data->socdata->measure_freq_mask);
713 if (data->socdata->version != TEMPMON_IMX7D)
714 regmap_write(map, IMX6_MISC0 + REG_SET,
715 IMX6_MISC0_REFTOP_SELBIASOFF);
716 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
717 data->socdata->power_down_mask);
718
719 ret = imx_thermal_register_legacy_cooling(data);
720 if (ret)
721 return dev_err_probe(&pdev->dev, ret,
722 "failed to register cpufreq cooling device\n");
723
724 data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
725 if (IS_ERR(data->thermal_clk)) {
726 ret = PTR_ERR(data->thermal_clk);
727 if (ret != -EPROBE_DEFER)
728 dev_err(&pdev->dev,
729 "failed to get thermal clk: %d\n", ret);
730 goto legacy_cleanup;
731 }
732
733 /*
734 * Thermal sensor needs clk on to get correct value, normally
735 * we should enable its clk before taking measurement and disable
736 * clk after measurement is done, but if alarm function is enabled,
737 * hardware will auto measure the temperature periodically, so we
738 * need to keep the clk always on for alarm function.
739 */
740 ret = clk_prepare_enable(data->thermal_clk);
741 if (ret) {
742 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
743 goto legacy_cleanup;
744 }
745
746 data->tz = thermal_zone_device_register("imx_thermal_zone",
747 IMX_TRIP_NUM,
748 BIT(IMX_TRIP_PASSIVE), data,
749 &imx_tz_ops, NULL,
750 IMX_PASSIVE_DELAY,
751 IMX_POLLING_DELAY);
752 if (IS_ERR(data->tz)) {
753 ret = PTR_ERR(data->tz);
754 dev_err(&pdev->dev,
755 "failed to register thermal zone device %d\n", ret);
756 goto clk_disable;
757 }
758
759 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
760 " critical:%dC passive:%dC\n", data->temp_grade,
761 data->temp_max / 1000, data->temp_critical / 1000,
762 data->temp_passive / 1000);
763
764 /* Enable measurements at ~ 10 Hz */
765 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
766 data->socdata->measure_freq_mask);
767 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
768 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
769 measure_freq << data->socdata->measure_freq_shift);
770 imx_set_alarm_temp(data, data->temp_passive);
771
772 if (data->socdata->version == TEMPMON_IMX6SX)
773 imx_set_panic_temp(data, data->temp_critical);
774
775 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
776 data->socdata->power_down_mask);
777 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
778 data->socdata->measure_temp_mask);
779 /* After power up, we need a delay before first access can be done. */
780 usleep_range(20, 50);
781
782 /* the core was configured and enabled just before */
783 pm_runtime_set_active(&pdev->dev);
784 pm_runtime_enable(data->dev);
785
786 ret = pm_runtime_resume_and_get(data->dev);
787 if (ret < 0)
788 goto disable_runtime_pm;
789
790 data->irq_enabled = true;
791 ret = thermal_zone_device_enable(data->tz);
792 if (ret)
793 goto thermal_zone_unregister;
794
795 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
796 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
797 0, "imx_thermal", data);
798 if (ret < 0) {
799 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
800 goto thermal_zone_unregister;
801 }
802
803 pm_runtime_put(data->dev);
804
805 return 0;
806
807 thermal_zone_unregister:
808 thermal_zone_device_unregister(data->tz);
809 disable_runtime_pm:
810 pm_runtime_put_noidle(data->dev);
811 pm_runtime_disable(data->dev);
812 clk_disable:
813 clk_disable_unprepare(data->thermal_clk);
814 legacy_cleanup:
815 imx_thermal_unregister_legacy_cooling(data);
816
817 return ret;
818 }
819
imx_thermal_remove(struct platform_device * pdev)820 static int imx_thermal_remove(struct platform_device *pdev)
821 {
822 struct imx_thermal_data *data = platform_get_drvdata(pdev);
823
824 pm_runtime_put_noidle(data->dev);
825 pm_runtime_disable(data->dev);
826
827 thermal_zone_device_unregister(data->tz);
828 imx_thermal_unregister_legacy_cooling(data);
829
830 return 0;
831 }
832
imx_thermal_suspend(struct device * dev)833 static int __maybe_unused imx_thermal_suspend(struct device *dev)
834 {
835 struct imx_thermal_data *data = dev_get_drvdata(dev);
836 int ret;
837
838 /*
839 * Need to disable thermal sensor, otherwise, when thermal core
840 * try to get temperature before thermal sensor resume, a wrong
841 * temperature will be read as the thermal sensor is powered
842 * down. This is done in change_mode() operation called from
843 * thermal_zone_device_disable()
844 */
845 ret = thermal_zone_device_disable(data->tz);
846 if (ret)
847 return ret;
848
849 return pm_runtime_force_suspend(data->dev);
850 }
851
imx_thermal_resume(struct device * dev)852 static int __maybe_unused imx_thermal_resume(struct device *dev)
853 {
854 struct imx_thermal_data *data = dev_get_drvdata(dev);
855 int ret;
856
857 ret = pm_runtime_force_resume(data->dev);
858 if (ret)
859 return ret;
860 /* Enabled thermal sensor after resume */
861 return thermal_zone_device_enable(data->tz);
862 }
863
imx_thermal_runtime_suspend(struct device * dev)864 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
865 {
866 struct imx_thermal_data *data = dev_get_drvdata(dev);
867 const struct thermal_soc_data *socdata = data->socdata;
868 struct regmap *map = data->tempmon;
869 int ret;
870
871 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
872 socdata->measure_temp_mask);
873 if (ret)
874 return ret;
875
876 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
877 socdata->power_down_mask);
878 if (ret)
879 return ret;
880
881 clk_disable_unprepare(data->thermal_clk);
882
883 return 0;
884 }
885
imx_thermal_runtime_resume(struct device * dev)886 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
887 {
888 struct imx_thermal_data *data = dev_get_drvdata(dev);
889 const struct thermal_soc_data *socdata = data->socdata;
890 struct regmap *map = data->tempmon;
891 int ret;
892
893 ret = clk_prepare_enable(data->thermal_clk);
894 if (ret)
895 return ret;
896
897 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
898 socdata->power_down_mask);
899 if (ret)
900 return ret;
901
902 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
903 socdata->measure_temp_mask);
904 if (ret)
905 return ret;
906
907 /*
908 * According to the temp sensor designers, it may require up to ~17us
909 * to complete a measurement.
910 */
911 usleep_range(20, 50);
912
913 return 0;
914 }
915
916 static const struct dev_pm_ops imx_thermal_pm_ops = {
917 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
918 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
919 imx_thermal_runtime_resume, NULL)
920 };
921
922 static struct platform_driver imx_thermal = {
923 .driver = {
924 .name = "imx_thermal",
925 .pm = &imx_thermal_pm_ops,
926 .of_match_table = of_imx_thermal_match,
927 },
928 .probe = imx_thermal_probe,
929 .remove = imx_thermal_remove,
930 };
931 module_platform_driver(imx_thermal);
932
933 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
934 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
935 MODULE_LICENSE("GPL v2");
936 MODULE_ALIAS("platform:imx-thermal");
937
