xref: /openbmc/linux/drivers/thermal/imx_thermal.c (revision 55b37d9c)
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 };
80 
81 #define IMX_POLLING_DELAY		2000 /* millisecond */
82 #define IMX_PASSIVE_DELAY		1000
83 
84 #define TEMPMON_IMX6Q			1
85 #define TEMPMON_IMX6SX			2
86 #define TEMPMON_IMX7D			3
87 
88 struct thermal_soc_data {
89 	u32 version;
90 
91 	u32 sensor_ctrl;
92 	u32 power_down_mask;
93 	u32 measure_temp_mask;
94 
95 	u32 measure_freq_ctrl;
96 	u32 measure_freq_mask;
97 	u32 measure_freq_shift;
98 
99 	u32 temp_data;
100 	u32 temp_value_mask;
101 	u32 temp_value_shift;
102 	u32 temp_valid_mask;
103 
104 	u32 panic_alarm_ctrl;
105 	u32 panic_alarm_mask;
106 	u32 panic_alarm_shift;
107 
108 	u32 high_alarm_ctrl;
109 	u32 high_alarm_mask;
110 	u32 high_alarm_shift;
111 
112 	u32 low_alarm_ctrl;
113 	u32 low_alarm_mask;
114 	u32 low_alarm_shift;
115 };
116 
117 static struct thermal_trip trips[] = {
118 	[IMX_TRIP_PASSIVE]  = { .type = THERMAL_TRIP_PASSIVE  },
119 	[IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL },
120 };
121 
122 static struct thermal_soc_data thermal_imx6q_data = {
123 	.version = TEMPMON_IMX6Q,
124 
125 	.sensor_ctrl = IMX6_TEMPSENSE0,
126 	.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
127 	.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
128 
129 	.measure_freq_ctrl = IMX6_TEMPSENSE1,
130 	.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
131 	.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
132 
133 	.temp_data = IMX6_TEMPSENSE0,
134 	.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
135 	.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
136 	.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
137 
138 	.high_alarm_ctrl = IMX6_TEMPSENSE0,
139 	.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
140 	.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
141 };
142 
143 static struct thermal_soc_data thermal_imx6sx_data = {
144 	.version = TEMPMON_IMX6SX,
145 
146 	.sensor_ctrl = IMX6_TEMPSENSE0,
147 	.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
148 	.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
149 
150 	.measure_freq_ctrl = IMX6_TEMPSENSE1,
151 	.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
152 	.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
153 
154 	.temp_data = IMX6_TEMPSENSE0,
155 	.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
156 	.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
157 	.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
158 
159 	.high_alarm_ctrl = IMX6_TEMPSENSE0,
160 	.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
161 	.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
162 
163 	.panic_alarm_ctrl = IMX6_TEMPSENSE2,
164 	.panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
165 	.panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
166 
167 	.low_alarm_ctrl = IMX6_TEMPSENSE2,
168 	.low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
169 	.low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
170 };
171 
172 static struct thermal_soc_data thermal_imx7d_data = {
173 	.version = TEMPMON_IMX7D,
174 
175 	.sensor_ctrl = IMX7_TEMPSENSE1,
176 	.power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
177 	.measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
178 
179 	.measure_freq_ctrl = IMX7_TEMPSENSE1,
180 	.measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
181 	.measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
182 
183 	.temp_data = IMX7_TEMPSENSE1,
184 	.temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
185 	.temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
186 	.temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
187 
188 	.panic_alarm_ctrl = IMX7_TEMPSENSE1,
189 	.panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
190 	.panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
191 
192 	.high_alarm_ctrl = IMX7_TEMPSENSE0,
193 	.high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
194 	.high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
195 
196 	.low_alarm_ctrl = IMX7_TEMPSENSE0,
197 	.low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
198 	.low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
199 };
200 
201 struct imx_thermal_data {
202 	struct device *dev;
203 	struct cpufreq_policy *policy;
204 	struct thermal_zone_device *tz;
205 	struct thermal_cooling_device *cdev;
206 	struct regmap *tempmon;
207 	u32 c1, c2; /* See formula in imx_init_calib() */
208 	int temp_max;
209 	int alarm_temp;
210 	int last_temp;
211 	bool irq_enabled;
212 	int irq;
213 	struct clk *thermal_clk;
214 	const struct thermal_soc_data *socdata;
215 	const char *temp_grade;
216 };
217 
218 static void imx_set_panic_temp(struct imx_thermal_data *data,
219 			       int panic_temp)
220 {
221 	const struct thermal_soc_data *soc_data = data->socdata;
222 	struct regmap *map = data->tempmon;
223 	int critical_value;
224 
225 	critical_value = (data->c2 - panic_temp) / data->c1;
226 
227 	regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
228 		     soc_data->panic_alarm_mask);
229 	regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
230 		     critical_value << soc_data->panic_alarm_shift);
231 }
232 
233 static void imx_set_alarm_temp(struct imx_thermal_data *data,
234 			       int alarm_temp)
235 {
236 	struct regmap *map = data->tempmon;
237 	const struct thermal_soc_data *soc_data = data->socdata;
238 	int alarm_value;
239 
240 	data->alarm_temp = alarm_temp;
241 
242 	if (data->socdata->version == TEMPMON_IMX7D)
243 		alarm_value = alarm_temp / 1000 + data->c1 - 25;
244 	else
245 		alarm_value = (data->c2 - alarm_temp) / data->c1;
246 
247 	regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
248 		     soc_data->high_alarm_mask);
249 	regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
250 		     alarm_value << soc_data->high_alarm_shift);
251 }
252 
253 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
254 {
255 	struct imx_thermal_data *data = thermal_zone_device_priv(tz);
256 	const struct thermal_soc_data *soc_data = data->socdata;
257 	struct regmap *map = data->tempmon;
258 	unsigned int n_meas;
259 	u32 val;
260 	int ret;
261 
262 	ret = pm_runtime_resume_and_get(data->dev);
263 	if (ret < 0)
264 		return ret;
265 
266 	regmap_read(map, soc_data->temp_data, &val);
267 
268 	if ((val & soc_data->temp_valid_mask) == 0)
269 		return -EAGAIN;
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 == trips[IMX_TRIP_PASSIVE].temperature &&
283 			*temp >= trips[IMX_TRIP_PASSIVE].temperature)
284 			imx_set_alarm_temp(data, trips[IMX_TRIP_CRITICAL].temperature);
285 		if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature &&
286 			*temp < trips[IMX_TRIP_PASSIVE].temperature) {
287 			imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature);
288 			dev_dbg(data->dev, "thermal alarm off: T < %d\n",
289 				data->alarm_temp / 1000);
290 		}
291 	}
292 
293 	if (*temp != data->last_temp) {
294 		dev_dbg(data->dev, "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 
309 static int imx_change_mode(struct thermal_zone_device *tz,
310 			   enum thermal_device_mode mode)
311 {
312 	struct imx_thermal_data *data = thermal_zone_device_priv(tz);
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 
333 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip_id,
334 			     int temp)
335 {
336 	struct imx_thermal_data *data = thermal_zone_device_priv(tz);
337 	struct thermal_trip trip;
338 	int ret;
339 
340 	ret = pm_runtime_resume_and_get(data->dev);
341 	if (ret < 0)
342 		return ret;
343 
344 	ret = __thermal_zone_get_trip(tz, trip_id, &trip);
345 	if (ret)
346 		return ret;
347 
348 	/* do not allow changing critical threshold */
349 	if (trip.type == THERMAL_TRIP_CRITICAL)
350 		return -EPERM;
351 
352 	/* do not allow passive to be set higher than critical */
353 	if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature)
354 		return -EINVAL;
355 
356 	imx_set_alarm_temp(data, temp);
357 
358 	pm_runtime_put(data->dev);
359 
360 	return 0;
361 }
362 
363 static int imx_bind(struct thermal_zone_device *tz,
364 		    struct thermal_cooling_device *cdev)
365 {
366 	return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
367 						THERMAL_NO_LIMIT,
368 						THERMAL_NO_LIMIT,
369 						THERMAL_WEIGHT_DEFAULT);
370 }
371 
372 static int imx_unbind(struct thermal_zone_device *tz,
373 		      struct thermal_cooling_device *cdev)
374 {
375 	return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
376 }
377 
378 static struct thermal_zone_device_ops imx_tz_ops = {
379 	.bind = imx_bind,
380 	.unbind = imx_unbind,
381 	.get_temp = imx_get_temp,
382 	.change_mode = imx_change_mode,
383 	.set_trip_temp = imx_set_trip_temp,
384 };
385 
386 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
387 {
388 	struct imx_thermal_data *data = platform_get_drvdata(pdev);
389 	int n1;
390 	u64 temp64;
391 
392 	if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
393 		dev_err(&pdev->dev, "invalid sensor calibration data\n");
394 		return -EINVAL;
395 	}
396 
397 	/*
398 	 * On i.MX7D, we only use the calibration data at 25C to get the temp,
399 	 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
400 	 */
401 	if (data->socdata->version == TEMPMON_IMX7D) {
402 		data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
403 		return 0;
404 	}
405 
406 	/*
407 	 * The sensor is calibrated at 25 °C (aka T1) and the value measured
408 	 * (aka N1) at this temperature is provided in bits [31:20] in the
409 	 * i.MX's OCOTP value ANA1.
410 	 * To find the actual temperature T, the following formula has to be used
411 	 * when reading value n from the sensor:
412 	 *
413 	 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
414 	 *   = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
415 	 *   = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
416 	 *   = c2 - c1 * N
417 	 *
418 	 * with
419 	 *
420 	 *  T1' = 28.580661 °C
421 	 *   c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
422 	 *   c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
423 	 *      = T1' + N1 * c1
424 	 */
425 	n1 = ocotp_ana1 >> 20;
426 
427 	temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
428 	temp64 *= 1000; /* to get result in °mC */
429 	do_div(temp64, 15423 * n1 - 4148468);
430 	data->c1 = temp64;
431 	data->c2 = n1 * data->c1 + 28581;
432 
433 	return 0;
434 }
435 
436 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
437 {
438 	struct imx_thermal_data *data = platform_get_drvdata(pdev);
439 
440 	/* The maximum die temp is specified by the Temperature Grade */
441 	switch ((ocotp_mem0 >> 6) & 0x3) {
442 	case 0: /* Commercial (0 to 95 °C) */
443 		data->temp_grade = "Commercial";
444 		data->temp_max = 95000;
445 		break;
446 	case 1: /* Extended Commercial (-20 °C to 105 °C) */
447 		data->temp_grade = "Extended Commercial";
448 		data->temp_max = 105000;
449 		break;
450 	case 2: /* Industrial (-40 °C to 105 °C) */
451 		data->temp_grade = "Industrial";
452 		data->temp_max = 105000;
453 		break;
454 	case 3: /* Automotive (-40 °C to 125 °C) */
455 		data->temp_grade = "Automotive";
456 		data->temp_max = 125000;
457 		break;
458 	}
459 
460 	/*
461 	 * Set the critical trip point at 5 °C under max
462 	 * Set the passive trip point at 10 °C under max (changeable via sysfs)
463 	 */
464 	trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10);
465 	trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5);
466 }
467 
468 static int imx_init_from_tempmon_data(struct platform_device *pdev)
469 {
470 	struct regmap *map;
471 	int ret;
472 	u32 val;
473 
474 	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
475 					      "fsl,tempmon-data");
476 	if (IS_ERR(map)) {
477 		ret = PTR_ERR(map);
478 		dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
479 		return ret;
480 	}
481 
482 	ret = regmap_read(map, OCOTP_ANA1, &val);
483 	if (ret) {
484 		dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
485 		return ret;
486 	}
487 	ret = imx_init_calib(pdev, val);
488 	if (ret)
489 		return ret;
490 
491 	ret = regmap_read(map, OCOTP_MEM0, &val);
492 	if (ret) {
493 		dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
494 		return ret;
495 	}
496 	imx_init_temp_grade(pdev, val);
497 
498 	return 0;
499 }
500 
501 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
502 {
503 	int ret;
504 	u32 val;
505 
506 	ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
507 	if (ret)
508 		return ret;
509 
510 	ret = imx_init_calib(pdev, val);
511 	if (ret)
512 		return ret;
513 
514 	ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
515 	if (ret)
516 		return ret;
517 	imx_init_temp_grade(pdev, val);
518 
519 	return 0;
520 }
521 
522 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
523 {
524 	struct imx_thermal_data *data = dev;
525 
526 	disable_irq_nosync(irq);
527 	data->irq_enabled = false;
528 
529 	return IRQ_WAKE_THREAD;
530 }
531 
532 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
533 {
534 	struct imx_thermal_data *data = dev;
535 
536 	dev_dbg(data->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000);
537 
538 	thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
539 
540 	return IRQ_HANDLED;
541 }
542 
543 static const struct of_device_id of_imx_thermal_match[] = {
544 	{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
545 	{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
546 	{ .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
547 	{ /* end */ }
548 };
549 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
550 
551 #ifdef CONFIG_CPU_FREQ
552 /*
553  * Create cooling device in case no #cooling-cells property is available in
554  * CPU node
555  */
556 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
557 {
558 	struct device_node *np;
559 	int ret = 0;
560 
561 	data->policy = cpufreq_cpu_get(0);
562 	if (!data->policy) {
563 		pr_debug("%s: CPUFreq policy not found\n", __func__);
564 		return -EPROBE_DEFER;
565 	}
566 
567 	np = of_get_cpu_node(data->policy->cpu, NULL);
568 
569 	if (!np || !of_property_present(np, "#cooling-cells")) {
570 		data->cdev = cpufreq_cooling_register(data->policy);
571 		if (IS_ERR(data->cdev)) {
572 			ret = PTR_ERR(data->cdev);
573 			cpufreq_cpu_put(data->policy);
574 		}
575 	}
576 
577 	of_node_put(np);
578 
579 	return ret;
580 }
581 
582 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
583 {
584 	cpufreq_cooling_unregister(data->cdev);
585 	cpufreq_cpu_put(data->policy);
586 }
587 
588 #else
589 
590 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
591 {
592 	return 0;
593 }
594 
595 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
596 {
597 }
598 #endif
599 
600 static int imx_thermal_probe(struct platform_device *pdev)
601 {
602 	struct imx_thermal_data *data;
603 	struct regmap *map;
604 	int measure_freq;
605 	int ret;
606 
607 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
608 	if (!data)
609 		return -ENOMEM;
610 
611 	data->dev = &pdev->dev;
612 
613 	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
614 	if (IS_ERR(map)) {
615 		ret = PTR_ERR(map);
616 		dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
617 		return ret;
618 	}
619 	data->tempmon = map;
620 
621 	data->socdata = of_device_get_match_data(&pdev->dev);
622 	if (!data->socdata) {
623 		dev_err(&pdev->dev, "no device match found\n");
624 		return -ENODEV;
625 	}
626 
627 	/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
628 	if (data->socdata->version == TEMPMON_IMX6SX) {
629 		regmap_write(map, IMX6_MISC1 + REG_CLR,
630 			IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
631 			| IMX6_MISC1_IRQ_TEMPPANIC);
632 		/*
633 		 * reset value of LOW ALARM is incorrect, set it to lowest
634 		 * value to avoid false trigger of low alarm.
635 		 */
636 		regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
637 			     data->socdata->low_alarm_mask);
638 	}
639 
640 	data->irq = platform_get_irq(pdev, 0);
641 	if (data->irq < 0)
642 		return data->irq;
643 
644 	platform_set_drvdata(pdev, data);
645 
646 	if (of_property_present(pdev->dev.of_node, "nvmem-cells")) {
647 		ret = imx_init_from_nvmem_cells(pdev);
648 		if (ret)
649 			return dev_err_probe(&pdev->dev, ret,
650 					     "failed to init from nvmem\n");
651 	} else {
652 		ret = imx_init_from_tempmon_data(pdev);
653 		if (ret) {
654 			dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
655 			return ret;
656 		}
657 	}
658 
659 	/* Make sure sensor is in known good state for measurements */
660 	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
661 		     data->socdata->power_down_mask);
662 	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
663 		     data->socdata->measure_temp_mask);
664 	regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
665 		     data->socdata->measure_freq_mask);
666 	if (data->socdata->version != TEMPMON_IMX7D)
667 		regmap_write(map, IMX6_MISC0 + REG_SET,
668 			IMX6_MISC0_REFTOP_SELBIASOFF);
669 	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
670 		     data->socdata->power_down_mask);
671 
672 	ret = imx_thermal_register_legacy_cooling(data);
673 	if (ret)
674 		return dev_err_probe(&pdev->dev, ret,
675 				     "failed to register cpufreq cooling device\n");
676 
677 	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
678 	if (IS_ERR(data->thermal_clk)) {
679 		ret = PTR_ERR(data->thermal_clk);
680 		if (ret != -EPROBE_DEFER)
681 			dev_err(&pdev->dev,
682 				"failed to get thermal clk: %d\n", ret);
683 		goto legacy_cleanup;
684 	}
685 
686 	/*
687 	 * Thermal sensor needs clk on to get correct value, normally
688 	 * we should enable its clk before taking measurement and disable
689 	 * clk after measurement is done, but if alarm function is enabled,
690 	 * hardware will auto measure the temperature periodically, so we
691 	 * need to keep the clk always on for alarm function.
692 	 */
693 	ret = clk_prepare_enable(data->thermal_clk);
694 	if (ret) {
695 		dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
696 		goto legacy_cleanup;
697 	}
698 
699 	data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone",
700 							   trips,
701 							   ARRAY_SIZE(trips),
702 							   BIT(IMX_TRIP_PASSIVE), data,
703 							   &imx_tz_ops, NULL,
704 							   IMX_PASSIVE_DELAY,
705 							   IMX_POLLING_DELAY);
706 	if (IS_ERR(data->tz)) {
707 		ret = PTR_ERR(data->tz);
708 		dev_err(&pdev->dev,
709 			"failed to register thermal zone device %d\n", ret);
710 		goto clk_disable;
711 	}
712 
713 	dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
714 		 " critical:%dC passive:%dC\n", data->temp_grade,
715 		 data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000,
716 		 trips[IMX_TRIP_PASSIVE].temperature / 1000);
717 
718 	/* Enable measurements at ~ 10 Hz */
719 	regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
720 		     data->socdata->measure_freq_mask);
721 	measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
722 	regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
723 		     measure_freq << data->socdata->measure_freq_shift);
724 	imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature);
725 
726 	if (data->socdata->version == TEMPMON_IMX6SX)
727 		imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature);
728 
729 	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
730 		     data->socdata->power_down_mask);
731 	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
732 		     data->socdata->measure_temp_mask);
733 	/* After power up, we need a delay before first access can be done. */
734 	usleep_range(20, 50);
735 
736 	/* the core was configured and enabled just before */
737 	pm_runtime_set_active(&pdev->dev);
738 	pm_runtime_enable(data->dev);
739 
740 	ret = pm_runtime_resume_and_get(data->dev);
741 	if (ret < 0)
742 		goto disable_runtime_pm;
743 
744 	data->irq_enabled = true;
745 	ret = thermal_zone_device_enable(data->tz);
746 	if (ret)
747 		goto thermal_zone_unregister;
748 
749 	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
750 			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
751 			0, "imx_thermal", data);
752 	if (ret < 0) {
753 		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
754 		goto thermal_zone_unregister;
755 	}
756 
757 	pm_runtime_put(data->dev);
758 
759 	return 0;
760 
761 thermal_zone_unregister:
762 	thermal_zone_device_unregister(data->tz);
763 disable_runtime_pm:
764 	pm_runtime_put_noidle(data->dev);
765 	pm_runtime_disable(data->dev);
766 clk_disable:
767 	clk_disable_unprepare(data->thermal_clk);
768 legacy_cleanup:
769 	imx_thermal_unregister_legacy_cooling(data);
770 
771 	return ret;
772 }
773 
774 static int imx_thermal_remove(struct platform_device *pdev)
775 {
776 	struct imx_thermal_data *data = platform_get_drvdata(pdev);
777 
778 	pm_runtime_put_noidle(data->dev);
779 	pm_runtime_disable(data->dev);
780 
781 	thermal_zone_device_unregister(data->tz);
782 	imx_thermal_unregister_legacy_cooling(data);
783 
784 	return 0;
785 }
786 
787 static int __maybe_unused imx_thermal_suspend(struct device *dev)
788 {
789 	struct imx_thermal_data *data = dev_get_drvdata(dev);
790 	int ret;
791 
792 	/*
793 	 * Need to disable thermal sensor, otherwise, when thermal core
794 	 * try to get temperature before thermal sensor resume, a wrong
795 	 * temperature will be read as the thermal sensor is powered
796 	 * down. This is done in change_mode() operation called from
797 	 * thermal_zone_device_disable()
798 	 */
799 	ret = thermal_zone_device_disable(data->tz);
800 	if (ret)
801 		return ret;
802 
803 	return pm_runtime_force_suspend(data->dev);
804 }
805 
806 static int __maybe_unused imx_thermal_resume(struct device *dev)
807 {
808 	struct imx_thermal_data *data = dev_get_drvdata(dev);
809 	int ret;
810 
811 	ret = pm_runtime_force_resume(data->dev);
812 	if (ret)
813 		return ret;
814 	/* Enabled thermal sensor after resume */
815 	return thermal_zone_device_enable(data->tz);
816 }
817 
818 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
819 {
820 	struct imx_thermal_data *data = dev_get_drvdata(dev);
821 	const struct thermal_soc_data *socdata = data->socdata;
822 	struct regmap *map = data->tempmon;
823 	int ret;
824 
825 	ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
826 			   socdata->measure_temp_mask);
827 	if (ret)
828 		return ret;
829 
830 	ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
831 			   socdata->power_down_mask);
832 	if (ret)
833 		return ret;
834 
835 	clk_disable_unprepare(data->thermal_clk);
836 
837 	return 0;
838 }
839 
840 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
841 {
842 	struct imx_thermal_data *data = dev_get_drvdata(dev);
843 	const struct thermal_soc_data *socdata = data->socdata;
844 	struct regmap *map = data->tempmon;
845 	int ret;
846 
847 	ret = clk_prepare_enable(data->thermal_clk);
848 	if (ret)
849 		return ret;
850 
851 	ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
852 			   socdata->power_down_mask);
853 	if (ret)
854 		return ret;
855 
856 	ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
857 			   socdata->measure_temp_mask);
858 	if (ret)
859 		return ret;
860 
861 	/*
862 	 * According to the temp sensor designers, it may require up to ~17us
863 	 * to complete a measurement.
864 	 */
865 	usleep_range(20, 50);
866 
867 	return 0;
868 }
869 
870 static const struct dev_pm_ops imx_thermal_pm_ops = {
871 	SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
872 	SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
873 			   imx_thermal_runtime_resume, NULL)
874 };
875 
876 static struct platform_driver imx_thermal = {
877 	.driver = {
878 		.name	= "imx_thermal",
879 		.pm	= &imx_thermal_pm_ops,
880 		.of_match_table = of_imx_thermal_match,
881 	},
882 	.probe		= imx_thermal_probe,
883 	.remove		= imx_thermal_remove,
884 };
885 module_platform_driver(imx_thermal);
886 
887 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
888 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
889 MODULE_LICENSE("GPL v2");
890 MODULE_ALIAS("platform:imx-thermal");
891