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10#include <linux/clk.h>
11#include <linux/cpu_cooling.h>
12#include <linux/delay.h>
13#include <linux/device.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/mfd/syscon.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_device.h>
22#include <linux/platform_device.h>
23#include <linux/regmap.h>
24#include <linux/slab.h>
25#include <linux/thermal.h>
26#include <linux/types.h>
27
28#define REG_SET 0x4
29#define REG_CLR 0x8
30#define REG_TOG 0xc
31
32#define MISC0 0x0150
33#define MISC0_REFTOP_SELBIASOFF (1 << 3)
34#define MISC1 0x0160
35#define MISC1_IRQ_TEMPHIGH (1 << 29)
36
37#define MISC1_IRQ_TEMPLOW (1 << 28)
38#define MISC1_IRQ_TEMPPANIC (1 << 27)
39
40#define TEMPSENSE0 0x0180
41#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
42#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
43#define TEMPSENSE0_TEMP_CNT_SHIFT 8
44#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
45#define TEMPSENSE0_FINISHED (1 << 2)
46#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
47#define TEMPSENSE0_POWER_DOWN (1 << 0)
48
49#define TEMPSENSE1 0x0190
50#define TEMPSENSE1_MEASURE_FREQ 0xffff
51
52#define TEMPSENSE2 0x0290
53#define TEMPSENSE2_LOW_VALUE_SHIFT 0
54#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
55#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
56#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
57
58#define OCOTP_ANA1 0x04e0
59
60
61enum imx_thermal_trip {
62 IMX_TRIP_PASSIVE,
63 IMX_TRIP_CRITICAL,
64 IMX_TRIP_NUM,
65};
66
67
68
69
70
71#define IMX_TEMP_PASSIVE 85000
72
73#define IMX_POLLING_DELAY 2000
74#define IMX_PASSIVE_DELAY 1000
75
76#define FACTOR0 10000000
77#define FACTOR1 15976
78#define FACTOR2 4297157
79
80#define TEMPMON_IMX6Q 1
81#define TEMPMON_IMX6SX 2
82
83struct thermal_soc_data {
84 u32 version;
85};
86
87static struct thermal_soc_data thermal_imx6q_data = {
88 .version = TEMPMON_IMX6Q,
89};
90
91static struct thermal_soc_data thermal_imx6sx_data = {
92 .version = TEMPMON_IMX6SX,
93};
94
95struct imx_thermal_data {
96 struct thermal_zone_device *tz;
97 struct thermal_cooling_device *cdev;
98 enum thermal_device_mode mode;
99 struct regmap *tempmon;
100 u32 c1, c2;
101 int temp_passive;
102 int temp_critical;
103 int alarm_temp;
104 int last_temp;
105 bool irq_enabled;
106 int irq;
107 struct clk *thermal_clk;
108 const struct thermal_soc_data *socdata;
109};
110
111static void imx_set_panic_temp(struct imx_thermal_data *data,
112 int panic_temp)
113{
114 struct regmap *map = data->tempmon;
115 int critical_value;
116
117 critical_value = (data->c2 - panic_temp) / data->c1;
118 regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
119 regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
120 TEMPSENSE2_PANIC_VALUE_SHIFT);
121}
122
123static void imx_set_alarm_temp(struct imx_thermal_data *data,
124 int alarm_temp)
125{
126 struct regmap *map = data->tempmon;
127 int alarm_value;
128
129 data->alarm_temp = alarm_temp;
130 alarm_value = (data->c2 - alarm_temp) / data->c1;
131 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
132 regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
133 TEMPSENSE0_ALARM_VALUE_SHIFT);
134}
135
136static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
137{
138 struct imx_thermal_data *data = tz->devdata;
139 struct regmap *map = data->tempmon;
140 unsigned int n_meas;
141 bool wait;
142 u32 val;
143
144 if (data->mode == THERMAL_DEVICE_ENABLED) {
145
146 regmap_read(map, TEMPSENSE0, &val);
147 wait = !(val & TEMPSENSE0_FINISHED);
148 } else {
149
150
151
152
153
154 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
155 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
156
157 wait = true;
158 }
159
160
161
162
163
164 if (wait)
165 usleep_range(20, 50);
166
167 regmap_read(map, TEMPSENSE0, &val);
168
169 if (data->mode != THERMAL_DEVICE_ENABLED) {
170 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
171 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
172 }
173
174 if ((val & TEMPSENSE0_FINISHED) == 0) {
175 dev_dbg(&tz->device, "temp measurement never finished\n");
176 return -EAGAIN;
177 }
178
179 n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
180
181
182 *temp = data->c2 - n_meas * data->c1;
183
184
185 if (data->socdata->version == TEMPMON_IMX6Q) {
186 if (data->alarm_temp == data->temp_passive &&
187 *temp >= data->temp_passive)
188 imx_set_alarm_temp(data, data->temp_critical);
189 if (data->alarm_temp == data->temp_critical &&
190 *temp < data->temp_passive) {
191 imx_set_alarm_temp(data, data->temp_passive);
192 dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
193 data->alarm_temp / 1000);
194 }
195 }
196
197 if (*temp != data->last_temp) {
198 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
199 data->last_temp = *temp;
200 }
201
202
203 if (!data->irq_enabled && *temp < data->alarm_temp) {
204 data->irq_enabled = true;
205 enable_irq(data->irq);
206 }
207
208 return 0;
209}
210
211static int imx_get_mode(struct thermal_zone_device *tz,
212 enum thermal_device_mode *mode)
213{
214 struct imx_thermal_data *data = tz->devdata;
215
216 *mode = data->mode;
217
218 return 0;
219}
220
221static int imx_set_mode(struct thermal_zone_device *tz,
222 enum thermal_device_mode mode)
223{
224 struct imx_thermal_data *data = tz->devdata;
225 struct regmap *map = data->tempmon;
226
227 if (mode == THERMAL_DEVICE_ENABLED) {
228 tz->polling_delay = IMX_POLLING_DELAY;
229 tz->passive_delay = IMX_PASSIVE_DELAY;
230
231 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
232 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
233
234 if (!data->irq_enabled) {
235 data->irq_enabled = true;
236 enable_irq(data->irq);
237 }
238 } else {
239 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
240 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
241
242 tz->polling_delay = 0;
243 tz->passive_delay = 0;
244
245 if (data->irq_enabled) {
246 disable_irq(data->irq);
247 data->irq_enabled = false;
248 }
249 }
250
251 data->mode = mode;
252 thermal_zone_device_update(tz);
253
254 return 0;
255}
256
257static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
258 enum thermal_trip_type *type)
259{
260 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
261 THERMAL_TRIP_CRITICAL;
262 return 0;
263}
264
265static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
266{
267 struct imx_thermal_data *data = tz->devdata;
268
269 *temp = data->temp_critical;
270 return 0;
271}
272
273static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
274 int *temp)
275{
276 struct imx_thermal_data *data = tz->devdata;
277
278 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
279 data->temp_critical;
280 return 0;
281}
282
283static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
284 int temp)
285{
286 struct imx_thermal_data *data = tz->devdata;
287
288 if (trip == IMX_TRIP_CRITICAL)
289 return -EPERM;
290
291 if (temp > IMX_TEMP_PASSIVE)
292 return -EINVAL;
293
294 data->temp_passive = temp;
295
296 imx_set_alarm_temp(data, temp);
297
298 return 0;
299}
300
301static int imx_bind(struct thermal_zone_device *tz,
302 struct thermal_cooling_device *cdev)
303{
304 int ret;
305
306 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
307 THERMAL_NO_LIMIT,
308 THERMAL_NO_LIMIT,
309 THERMAL_WEIGHT_DEFAULT);
310 if (ret) {
311 dev_err(&tz->device,
312 "binding zone %s with cdev %s failed:%d\n",
313 tz->type, cdev->type, ret);
314 return ret;
315 }
316
317 return 0;
318}
319
320static int imx_unbind(struct thermal_zone_device *tz,
321 struct thermal_cooling_device *cdev)
322{
323 int ret;
324
325 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
326 if (ret) {
327 dev_err(&tz->device,
328 "unbinding zone %s with cdev %s failed:%d\n",
329 tz->type, cdev->type, ret);
330 return ret;
331 }
332
333 return 0;
334}
335
336static struct thermal_zone_device_ops imx_tz_ops = {
337 .bind = imx_bind,
338 .unbind = imx_unbind,
339 .get_temp = imx_get_temp,
340 .get_mode = imx_get_mode,
341 .set_mode = imx_set_mode,
342 .get_trip_type = imx_get_trip_type,
343 .get_trip_temp = imx_get_trip_temp,
344 .get_crit_temp = imx_get_crit_temp,
345 .set_trip_temp = imx_set_trip_temp,
346};
347
348static int imx_get_sensor_data(struct platform_device *pdev)
349{
350 struct imx_thermal_data *data = platform_get_drvdata(pdev);
351 struct regmap *map;
352 int t1, n1;
353 int ret;
354 u32 val;
355 u64 temp64;
356
357 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
358 "fsl,tempmon-data");
359 if (IS_ERR(map)) {
360 ret = PTR_ERR(map);
361 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
362 return ret;
363 }
364
365 ret = regmap_read(map, OCOTP_ANA1, &val);
366 if (ret) {
367 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
368 return ret;
369 }
370
371 if (val == 0 || val == ~0) {
372 dev_err(&pdev->dev, "invalid sensor calibration data\n");
373 return -EINVAL;
374 }
375
376
377
378
379
380
381
382 n1 = val >> 20;
383 t1 = 25;
384
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398
399
400
401 temp64 = FACTOR0;
402 temp64 *= 1000;
403 do_div(temp64, FACTOR1 * n1 - FACTOR2);
404 data->c1 = temp64;
405 data->c2 = n1 * data->c1 + 1000 * t1;
406
407
408
409
410
411 data->temp_passive = IMX_TEMP_PASSIVE;
412
413
414
415
416
417 data->temp_critical = 1000 * 20 + data->temp_passive;
418
419 return 0;
420}
421
422static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
423{
424 struct imx_thermal_data *data = dev;
425
426 disable_irq_nosync(irq);
427 data->irq_enabled = false;
428
429 return IRQ_WAKE_THREAD;
430}
431
432static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
433{
434 struct imx_thermal_data *data = dev;
435
436 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
437 data->alarm_temp / 1000);
438
439 thermal_zone_device_update(data->tz);
440
441 return IRQ_HANDLED;
442}
443
444static const struct of_device_id of_imx_thermal_match[] = {
445 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
446 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
447 { }
448};
449MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
450
451static int imx_thermal_probe(struct platform_device *pdev)
452{
453 const struct of_device_id *of_id =
454 of_match_device(of_imx_thermal_match, &pdev->dev);
455 struct imx_thermal_data *data;
456 struct regmap *map;
457 int measure_freq;
458 int ret;
459
460 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
461 if (!data)
462 return -ENOMEM;
463
464 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
465 if (IS_ERR(map)) {
466 ret = PTR_ERR(map);
467 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
468 return ret;
469 }
470 data->tempmon = map;
471
472 data->socdata = of_id->data;
473
474
475 if (data->socdata->version == TEMPMON_IMX6SX) {
476 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
477 MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
478
479
480
481
482 regmap_write(map, TEMPSENSE2 + REG_SET,
483 TEMPSENSE2_LOW_VALUE_MASK);
484 }
485
486 data->irq = platform_get_irq(pdev, 0);
487 if (data->irq < 0)
488 return data->irq;
489
490 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
491 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
492 0, "imx_thermal", data);
493 if (ret < 0) {
494 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
495 return ret;
496 }
497
498 platform_set_drvdata(pdev, data);
499
500 ret = imx_get_sensor_data(pdev);
501 if (ret) {
502 dev_err(&pdev->dev, "failed to get sensor data\n");
503 return ret;
504 }
505
506
507 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
508 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
509 regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
510 regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
511 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
512
513 data->cdev = cpufreq_cooling_register(cpu_present_mask);
514 if (IS_ERR(data->cdev)) {
515 ret = PTR_ERR(data->cdev);
516 if (ret != -EPROBE_DEFER)
517 dev_err(&pdev->dev,
518 "failed to register cpufreq cooling device: %d\n",
519 ret);
520 return ret;
521 }
522
523 data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
524 if (IS_ERR(data->thermal_clk)) {
525 ret = PTR_ERR(data->thermal_clk);
526 if (ret != -EPROBE_DEFER)
527 dev_err(&pdev->dev,
528 "failed to get thermal clk: %d\n", ret);
529 cpufreq_cooling_unregister(data->cdev);
530 return ret;
531 }
532
533
534
535
536
537
538
539
540 ret = clk_prepare_enable(data->thermal_clk);
541 if (ret) {
542 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
543 cpufreq_cooling_unregister(data->cdev);
544 return ret;
545 }
546
547 data->tz = thermal_zone_device_register("imx_thermal_zone",
548 IMX_TRIP_NUM,
549 BIT(IMX_TRIP_PASSIVE), data,
550 &imx_tz_ops, NULL,
551 IMX_PASSIVE_DELAY,
552 IMX_POLLING_DELAY);
553 if (IS_ERR(data->tz)) {
554 ret = PTR_ERR(data->tz);
555 dev_err(&pdev->dev,
556 "failed to register thermal zone device %d\n", ret);
557 clk_disable_unprepare(data->thermal_clk);
558 cpufreq_cooling_unregister(data->cdev);
559 return ret;
560 }
561
562
563 regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
564 measure_freq = DIV_ROUND_UP(32768, 10);
565 regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
566 imx_set_alarm_temp(data, data->temp_passive);
567
568 if (data->socdata->version == TEMPMON_IMX6SX)
569 imx_set_panic_temp(data, data->temp_critical);
570
571 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
572 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
573
574 data->irq_enabled = true;
575 data->mode = THERMAL_DEVICE_ENABLED;
576
577 return 0;
578}
579
580static int imx_thermal_remove(struct platform_device *pdev)
581{
582 struct imx_thermal_data *data = platform_get_drvdata(pdev);
583 struct regmap *map = data->tempmon;
584
585
586 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
587 if (!IS_ERR(data->thermal_clk))
588 clk_disable_unprepare(data->thermal_clk);
589
590 thermal_zone_device_unregister(data->tz);
591 cpufreq_cooling_unregister(data->cdev);
592
593 return 0;
594}
595
596#ifdef CONFIG_PM_SLEEP
597static int imx_thermal_suspend(struct device *dev)
598{
599 struct imx_thermal_data *data = dev_get_drvdata(dev);
600 struct regmap *map = data->tempmon;
601
602
603
604
605
606
607
608 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
609 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
610 data->mode = THERMAL_DEVICE_DISABLED;
611 clk_disable_unprepare(data->thermal_clk);
612
613 return 0;
614}
615
616static int imx_thermal_resume(struct device *dev)
617{
618 struct imx_thermal_data *data = dev_get_drvdata(dev);
619 struct regmap *map = data->tempmon;
620
621 clk_prepare_enable(data->thermal_clk);
622
623 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
624 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
625 data->mode = THERMAL_DEVICE_ENABLED;
626
627 return 0;
628}
629#endif
630
631static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
632 imx_thermal_suspend, imx_thermal_resume);
633
634static struct platform_driver imx_thermal = {
635 .driver = {
636 .name = "imx_thermal",
637 .pm = &imx_thermal_pm_ops,
638 .of_match_table = of_imx_thermal_match,
639 },
640 .probe = imx_thermal_probe,
641 .remove = imx_thermal_remove,
642};
643module_platform_driver(imx_thermal);
644
645MODULE_AUTHOR("Freescale Semiconductor, Inc.");
646MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
647MODULE_LICENSE("GPL v2");
648MODULE_ALIAS("platform:imx-thermal");
649