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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/platform_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 */
76enum 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
88struct 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
117static struct thermal_trip trips[] = {
118 [IMX_TRIP_PASSIVE] = { .type = THERMAL_TRIP_PASSIVE },
119 [IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL },
120};
121
122static 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
143static 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
172static 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
201struct 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
218static 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
233static 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
253static 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
309static 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
333static 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
363static 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
372static 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
378static 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
386static 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
436static 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
468static 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
501static 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
522static 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
532static 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
543static 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};
549MODULE_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 */
556static 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
582static 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
590static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
591{
592 return 0;
593}
594
595static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
596{
597}
598#endif
599
600static 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
761thermal_zone_unregister:
762 thermal_zone_device_unregister(data->tz);
763disable_runtime_pm:
764 pm_runtime_put_noidle(data->dev);
765 pm_runtime_disable(data->dev);
766clk_disable:
767 clk_disable_unprepare(data->thermal_clk);
768legacy_cleanup:
769 imx_thermal_unregister_legacy_cooling(data);
770
771 return ret;
772}
773
774static void 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
785static int __maybe_unused imx_thermal_suspend(struct device *dev)
786{
787 struct imx_thermal_data *data = dev_get_drvdata(dev);
788 int ret;
789
790 /*
791 * Need to disable thermal sensor, otherwise, when thermal core
792 * try to get temperature before thermal sensor resume, a wrong
793 * temperature will be read as the thermal sensor is powered
794 * down. This is done in change_mode() operation called from
795 * thermal_zone_device_disable()
796 */
797 ret = thermal_zone_device_disable(data->tz);
798 if (ret)
799 return ret;
800
801 return pm_runtime_force_suspend(data->dev);
802}
803
804static int __maybe_unused imx_thermal_resume(struct device *dev)
805{
806 struct imx_thermal_data *data = dev_get_drvdata(dev);
807 int ret;
808
809 ret = pm_runtime_force_resume(data->dev);
810 if (ret)
811 return ret;
812 /* Enabled thermal sensor after resume */
813 return thermal_zone_device_enable(data->tz);
814}
815
816static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
817{
818 struct imx_thermal_data *data = dev_get_drvdata(dev);
819 const struct thermal_soc_data *socdata = data->socdata;
820 struct regmap *map = data->tempmon;
821 int ret;
822
823 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
824 socdata->measure_temp_mask);
825 if (ret)
826 return ret;
827
828 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
829 socdata->power_down_mask);
830 if (ret)
831 return ret;
832
833 clk_disable_unprepare(data->thermal_clk);
834
835 return 0;
836}
837
838static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
839{
840 struct imx_thermal_data *data = dev_get_drvdata(dev);
841 const struct thermal_soc_data *socdata = data->socdata;
842 struct regmap *map = data->tempmon;
843 int ret;
844
845 ret = clk_prepare_enable(data->thermal_clk);
846 if (ret)
847 return ret;
848
849 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
850 socdata->power_down_mask);
851 if (ret)
852 return ret;
853
854 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
855 socdata->measure_temp_mask);
856 if (ret)
857 return ret;
858
859 /*
860 * According to the temp sensor designers, it may require up to ~17us
861 * to complete a measurement.
862 */
863 usleep_range(20, 50);
864
865 return 0;
866}
867
868static const struct dev_pm_ops imx_thermal_pm_ops = {
869 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
870 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
871 imx_thermal_runtime_resume, NULL)
872};
873
874static struct platform_driver imx_thermal = {
875 .driver = {
876 .name = "imx_thermal",
877 .pm = &imx_thermal_pm_ops,
878 .of_match_table = of_imx_thermal_match,
879 },
880 .probe = imx_thermal_probe,
881 .remove_new = imx_thermal_remove,
882};
883module_platform_driver(imx_thermal);
884
885MODULE_AUTHOR("Freescale Semiconductor, Inc.");
886MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
887MODULE_LICENSE("GPL v2");
888MODULE_ALIAS("platform:imx-thermal");
1/*
2 * Copyright 2013 Freescale Semiconductor, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 */
9
10#include <linux/clk.h>
11#include <linux/cpufreq.h>
12#include <linux/cpu_cooling.h>
13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/io.h>
18#include <linux/kernel.h>
19#include <linux/mfd/syscon.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_device.h>
23#include <linux/platform_device.h>
24#include <linux/regmap.h>
25#include <linux/slab.h>
26#include <linux/thermal.h>
27#include <linux/types.h>
28#include <linux/nvmem-consumer.h>
29
30#define REG_SET 0x4
31#define REG_CLR 0x8
32#define REG_TOG 0xc
33
34#define MISC0 0x0150
35#define MISC0_REFTOP_SELBIASOFF (1 << 3)
36#define MISC1 0x0160
37#define MISC1_IRQ_TEMPHIGH (1 << 29)
38/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
39#define MISC1_IRQ_TEMPLOW (1 << 28)
40#define MISC1_IRQ_TEMPPANIC (1 << 27)
41
42#define TEMPSENSE0 0x0180
43#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
44#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
45#define TEMPSENSE0_TEMP_CNT_SHIFT 8
46#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
47#define TEMPSENSE0_FINISHED (1 << 2)
48#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
49#define TEMPSENSE0_POWER_DOWN (1 << 0)
50
51#define TEMPSENSE1 0x0190
52#define TEMPSENSE1_MEASURE_FREQ 0xffff
53/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
54#define TEMPSENSE2 0x0290
55#define TEMPSENSE2_LOW_VALUE_SHIFT 0
56#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
57#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
58#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
59
60#define OCOTP_MEM0 0x0480
61#define OCOTP_ANA1 0x04e0
62
63/* The driver supports 1 passive trip point and 1 critical trip point */
64enum imx_thermal_trip {
65 IMX_TRIP_PASSIVE,
66 IMX_TRIP_CRITICAL,
67 IMX_TRIP_NUM,
68};
69
70#define IMX_POLLING_DELAY 2000 /* millisecond */
71#define IMX_PASSIVE_DELAY 1000
72
73#define TEMPMON_IMX6Q 1
74#define TEMPMON_IMX6SX 2
75
76struct thermal_soc_data {
77 u32 version;
78};
79
80static struct thermal_soc_data thermal_imx6q_data = {
81 .version = TEMPMON_IMX6Q,
82};
83
84static struct thermal_soc_data thermal_imx6sx_data = {
85 .version = TEMPMON_IMX6SX,
86};
87
88struct imx_thermal_data {
89 struct cpufreq_policy *policy;
90 struct thermal_zone_device *tz;
91 struct thermal_cooling_device *cdev;
92 enum thermal_device_mode mode;
93 struct regmap *tempmon;
94 u32 c1, c2; /* See formula in imx_init_calib() */
95 int temp_passive;
96 int temp_critical;
97 int temp_max;
98 int alarm_temp;
99 int last_temp;
100 bool irq_enabled;
101 int irq;
102 struct clk *thermal_clk;
103 const struct thermal_soc_data *socdata;
104 const char *temp_grade;
105};
106
107static void imx_set_panic_temp(struct imx_thermal_data *data,
108 int panic_temp)
109{
110 struct regmap *map = data->tempmon;
111 int critical_value;
112
113 critical_value = (data->c2 - panic_temp) / data->c1;
114 regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
115 regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
116 TEMPSENSE2_PANIC_VALUE_SHIFT);
117}
118
119static void imx_set_alarm_temp(struct imx_thermal_data *data,
120 int alarm_temp)
121{
122 struct regmap *map = data->tempmon;
123 int alarm_value;
124
125 data->alarm_temp = alarm_temp;
126 alarm_value = (data->c2 - alarm_temp) / data->c1;
127 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
128 regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
129 TEMPSENSE0_ALARM_VALUE_SHIFT);
130}
131
132static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
133{
134 struct imx_thermal_data *data = tz->devdata;
135 struct regmap *map = data->tempmon;
136 unsigned int n_meas;
137 bool wait;
138 u32 val;
139
140 if (data->mode == THERMAL_DEVICE_ENABLED) {
141 /* Check if a measurement is currently in progress */
142 regmap_read(map, TEMPSENSE0, &val);
143 wait = !(val & TEMPSENSE0_FINISHED);
144 } else {
145 /*
146 * Every time we measure the temperature, we will power on the
147 * temperature sensor, enable measurements, take a reading,
148 * disable measurements, power off the temperature sensor.
149 */
150 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
151 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
152
153 wait = true;
154 }
155
156 /*
157 * According to the temp sensor designers, it may require up to ~17us
158 * to complete a measurement.
159 */
160 if (wait)
161 usleep_range(20, 50);
162
163 regmap_read(map, TEMPSENSE0, &val);
164
165 if (data->mode != THERMAL_DEVICE_ENABLED) {
166 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
167 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
168 }
169
170 if ((val & TEMPSENSE0_FINISHED) == 0) {
171 dev_dbg(&tz->device, "temp measurement never finished\n");
172 return -EAGAIN;
173 }
174
175 n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
176
177 /* See imx_init_calib() for formula derivation */
178 *temp = data->c2 - n_meas * data->c1;
179
180 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
181 if (data->socdata->version == TEMPMON_IMX6Q) {
182 if (data->alarm_temp == data->temp_passive &&
183 *temp >= data->temp_passive)
184 imx_set_alarm_temp(data, data->temp_critical);
185 if (data->alarm_temp == data->temp_critical &&
186 *temp < data->temp_passive) {
187 imx_set_alarm_temp(data, data->temp_passive);
188 dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
189 data->alarm_temp / 1000);
190 }
191 }
192
193 if (*temp != data->last_temp) {
194 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
195 data->last_temp = *temp;
196 }
197
198 /* Reenable alarm IRQ if temperature below alarm temperature */
199 if (!data->irq_enabled && *temp < data->alarm_temp) {
200 data->irq_enabled = true;
201 enable_irq(data->irq);
202 }
203
204 return 0;
205}
206
207static int imx_get_mode(struct thermal_zone_device *tz,
208 enum thermal_device_mode *mode)
209{
210 struct imx_thermal_data *data = tz->devdata;
211
212 *mode = data->mode;
213
214 return 0;
215}
216
217static int imx_set_mode(struct thermal_zone_device *tz,
218 enum thermal_device_mode mode)
219{
220 struct imx_thermal_data *data = tz->devdata;
221 struct regmap *map = data->tempmon;
222
223 if (mode == THERMAL_DEVICE_ENABLED) {
224 tz->polling_delay = IMX_POLLING_DELAY;
225 tz->passive_delay = IMX_PASSIVE_DELAY;
226
227 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
228 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
229
230 if (!data->irq_enabled) {
231 data->irq_enabled = true;
232 enable_irq(data->irq);
233 }
234 } else {
235 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
236 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
237
238 tz->polling_delay = 0;
239 tz->passive_delay = 0;
240
241 if (data->irq_enabled) {
242 disable_irq(data->irq);
243 data->irq_enabled = false;
244 }
245 }
246
247 data->mode = mode;
248 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
249
250 return 0;
251}
252
253static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
254 enum thermal_trip_type *type)
255{
256 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
257 THERMAL_TRIP_CRITICAL;
258 return 0;
259}
260
261static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
262{
263 struct imx_thermal_data *data = tz->devdata;
264
265 *temp = data->temp_critical;
266 return 0;
267}
268
269static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
270 int *temp)
271{
272 struct imx_thermal_data *data = tz->devdata;
273
274 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
275 data->temp_critical;
276 return 0;
277}
278
279static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
280 int temp)
281{
282 struct imx_thermal_data *data = tz->devdata;
283
284 /* do not allow changing critical threshold */
285 if (trip == IMX_TRIP_CRITICAL)
286 return -EPERM;
287
288 /* do not allow passive to be set higher than critical */
289 if (temp < 0 || temp > data->temp_critical)
290 return -EINVAL;
291
292 data->temp_passive = temp;
293
294 imx_set_alarm_temp(data, temp);
295
296 return 0;
297}
298
299static int imx_bind(struct thermal_zone_device *tz,
300 struct thermal_cooling_device *cdev)
301{
302 int ret;
303
304 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
305 THERMAL_NO_LIMIT,
306 THERMAL_NO_LIMIT,
307 THERMAL_WEIGHT_DEFAULT);
308 if (ret) {
309 dev_err(&tz->device,
310 "binding zone %s with cdev %s failed:%d\n",
311 tz->type, cdev->type, ret);
312 return ret;
313 }
314
315 return 0;
316}
317
318static int imx_unbind(struct thermal_zone_device *tz,
319 struct thermal_cooling_device *cdev)
320{
321 int ret;
322
323 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
324 if (ret) {
325 dev_err(&tz->device,
326 "unbinding zone %s with cdev %s failed:%d\n",
327 tz->type, cdev->type, ret);
328 return ret;
329 }
330
331 return 0;
332}
333
334static struct thermal_zone_device_ops imx_tz_ops = {
335 .bind = imx_bind,
336 .unbind = imx_unbind,
337 .get_temp = imx_get_temp,
338 .get_mode = imx_get_mode,
339 .set_mode = imx_set_mode,
340 .get_trip_type = imx_get_trip_type,
341 .get_trip_temp = imx_get_trip_temp,
342 .get_crit_temp = imx_get_crit_temp,
343 .set_trip_temp = imx_set_trip_temp,
344};
345
346static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
347{
348 struct imx_thermal_data *data = platform_get_drvdata(pdev);
349 int n1;
350 u64 temp64;
351
352 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
353 dev_err(&pdev->dev, "invalid sensor calibration data\n");
354 return -EINVAL;
355 }
356
357 /*
358 * The sensor is calibrated at 25 °C (aka T1) and the value measured
359 * (aka N1) at this temperature is provided in bits [31:20] in the
360 * i.MX's OCOTP value ANA1.
361 * To find the actual temperature T, the following formula has to be used
362 * when reading value n from the sensor:
363 *
364 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
365 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
366 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
367 * = c2 - c1 * N
368 *
369 * with
370 *
371 * T1' = 28.580661 °C
372 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
373 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
374 * = T1' + N1 * c1
375 */
376 n1 = ocotp_ana1 >> 20;
377
378 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
379 temp64 *= 1000; /* to get result in °mC */
380 do_div(temp64, 15423 * n1 - 4148468);
381 data->c1 = temp64;
382 data->c2 = n1 * data->c1 + 28581;
383
384 return 0;
385}
386
387static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
388{
389 struct imx_thermal_data *data = platform_get_drvdata(pdev);
390
391 /* The maximum die temp is specified by the Temperature Grade */
392 switch ((ocotp_mem0 >> 6) & 0x3) {
393 case 0: /* Commercial (0 to 95 °C) */
394 data->temp_grade = "Commercial";
395 data->temp_max = 95000;
396 break;
397 case 1: /* Extended Commercial (-20 °C to 105 °C) */
398 data->temp_grade = "Extended Commercial";
399 data->temp_max = 105000;
400 break;
401 case 2: /* Industrial (-40 °C to 105 °C) */
402 data->temp_grade = "Industrial";
403 data->temp_max = 105000;
404 break;
405 case 3: /* Automotive (-40 °C to 125 °C) */
406 data->temp_grade = "Automotive";
407 data->temp_max = 125000;
408 break;
409 }
410
411 /*
412 * Set the critical trip point at 5 °C under max
413 * Set the passive trip point at 10 °C under max (changeable via sysfs)
414 */
415 data->temp_critical = data->temp_max - (1000 * 5);
416 data->temp_passive = data->temp_max - (1000 * 10);
417}
418
419static int imx_init_from_tempmon_data(struct platform_device *pdev)
420{
421 struct regmap *map;
422 int ret;
423 u32 val;
424
425 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
426 "fsl,tempmon-data");
427 if (IS_ERR(map)) {
428 ret = PTR_ERR(map);
429 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
430 return ret;
431 }
432
433 ret = regmap_read(map, OCOTP_ANA1, &val);
434 if (ret) {
435 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
436 return ret;
437 }
438 ret = imx_init_calib(pdev, val);
439 if (ret)
440 return ret;
441
442 ret = regmap_read(map, OCOTP_MEM0, &val);
443 if (ret) {
444 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
445 return ret;
446 }
447 imx_init_temp_grade(pdev, val);
448
449 return 0;
450}
451
452static int imx_init_from_nvmem_cells(struct platform_device *pdev)
453{
454 int ret;
455 u32 val;
456
457 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
458 if (ret)
459 return ret;
460 imx_init_calib(pdev, val);
461
462 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
463 if (ret)
464 return ret;
465 imx_init_temp_grade(pdev, val);
466
467 return 0;
468}
469
470static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
471{
472 struct imx_thermal_data *data = dev;
473
474 disable_irq_nosync(irq);
475 data->irq_enabled = false;
476
477 return IRQ_WAKE_THREAD;
478}
479
480static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
481{
482 struct imx_thermal_data *data = dev;
483
484 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
485 data->alarm_temp / 1000);
486
487 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
488
489 return IRQ_HANDLED;
490}
491
492static const struct of_device_id of_imx_thermal_match[] = {
493 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
494 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
495 { /* end */ }
496};
497MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
498
499static int imx_thermal_probe(struct platform_device *pdev)
500{
501 struct imx_thermal_data *data;
502 struct regmap *map;
503 int measure_freq;
504 int ret;
505
506 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
507 if (!data)
508 return -ENOMEM;
509
510 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
511 if (IS_ERR(map)) {
512 ret = PTR_ERR(map);
513 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
514 return ret;
515 }
516 data->tempmon = map;
517
518 data->socdata = of_device_get_match_data(&pdev->dev);
519 if (!data->socdata) {
520 dev_err(&pdev->dev, "no device match found\n");
521 return -ENODEV;
522 }
523
524 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
525 if (data->socdata->version == TEMPMON_IMX6SX) {
526 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
527 MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
528 /*
529 * reset value of LOW ALARM is incorrect, set it to lowest
530 * value to avoid false trigger of low alarm.
531 */
532 regmap_write(map, TEMPSENSE2 + REG_SET,
533 TEMPSENSE2_LOW_VALUE_MASK);
534 }
535
536 data->irq = platform_get_irq(pdev, 0);
537 if (data->irq < 0)
538 return data->irq;
539
540 platform_set_drvdata(pdev, data);
541
542 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
543 ret = imx_init_from_nvmem_cells(pdev);
544 if (ret == -EPROBE_DEFER)
545 return ret;
546 if (ret) {
547 dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
548 ret);
549 return ret;
550 }
551 } else {
552 ret = imx_init_from_tempmon_data(pdev);
553 if (ret) {
554 dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
555 return ret;
556 }
557 }
558
559 /* Make sure sensor is in known good state for measurements */
560 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
561 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
562 regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
563 regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
564 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
565
566 data->policy = cpufreq_cpu_get(0);
567 if (!data->policy) {
568 pr_debug("%s: CPUFreq policy not found\n", __func__);
569 return -EPROBE_DEFER;
570 }
571
572 data->cdev = cpufreq_cooling_register(data->policy);
573 if (IS_ERR(data->cdev)) {
574 ret = PTR_ERR(data->cdev);
575 dev_err(&pdev->dev,
576 "failed to register cpufreq cooling device: %d\n", ret);
577 cpufreq_cpu_put(data->policy);
578 return ret;
579 }
580
581 data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
582 if (IS_ERR(data->thermal_clk)) {
583 ret = PTR_ERR(data->thermal_clk);
584 if (ret != -EPROBE_DEFER)
585 dev_err(&pdev->dev,
586 "failed to get thermal clk: %d\n", ret);
587 cpufreq_cooling_unregister(data->cdev);
588 cpufreq_cpu_put(data->policy);
589 return ret;
590 }
591
592 /*
593 * Thermal sensor needs clk on to get correct value, normally
594 * we should enable its clk before taking measurement and disable
595 * clk after measurement is done, but if alarm function is enabled,
596 * hardware will auto measure the temperature periodically, so we
597 * need to keep the clk always on for alarm function.
598 */
599 ret = clk_prepare_enable(data->thermal_clk);
600 if (ret) {
601 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
602 cpufreq_cooling_unregister(data->cdev);
603 cpufreq_cpu_put(data->policy);
604 return ret;
605 }
606
607 data->tz = thermal_zone_device_register("imx_thermal_zone",
608 IMX_TRIP_NUM,
609 BIT(IMX_TRIP_PASSIVE), data,
610 &imx_tz_ops, NULL,
611 IMX_PASSIVE_DELAY,
612 IMX_POLLING_DELAY);
613 if (IS_ERR(data->tz)) {
614 ret = PTR_ERR(data->tz);
615 dev_err(&pdev->dev,
616 "failed to register thermal zone device %d\n", ret);
617 clk_disable_unprepare(data->thermal_clk);
618 cpufreq_cooling_unregister(data->cdev);
619 cpufreq_cpu_put(data->policy);
620 return ret;
621 }
622
623 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
624 " critical:%dC passive:%dC\n", data->temp_grade,
625 data->temp_max / 1000, data->temp_critical / 1000,
626 data->temp_passive / 1000);
627
628 /* Enable measurements at ~ 10 Hz */
629 regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
630 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
631 regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
632 imx_set_alarm_temp(data, data->temp_passive);
633
634 if (data->socdata->version == TEMPMON_IMX6SX)
635 imx_set_panic_temp(data, data->temp_critical);
636
637 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
638 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
639
640 data->irq_enabled = true;
641 data->mode = THERMAL_DEVICE_ENABLED;
642
643 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
644 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
645 0, "imx_thermal", data);
646 if (ret < 0) {
647 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
648 clk_disable_unprepare(data->thermal_clk);
649 thermal_zone_device_unregister(data->tz);
650 cpufreq_cooling_unregister(data->cdev);
651 cpufreq_cpu_put(data->policy);
652 return ret;
653 }
654
655 return 0;
656}
657
658static int imx_thermal_remove(struct platform_device *pdev)
659{
660 struct imx_thermal_data *data = platform_get_drvdata(pdev);
661 struct regmap *map = data->tempmon;
662
663 /* Disable measurements */
664 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
665 if (!IS_ERR(data->thermal_clk))
666 clk_disable_unprepare(data->thermal_clk);
667
668 thermal_zone_device_unregister(data->tz);
669 cpufreq_cooling_unregister(data->cdev);
670 cpufreq_cpu_put(data->policy);
671
672 return 0;
673}
674
675#ifdef CONFIG_PM_SLEEP
676static int imx_thermal_suspend(struct device *dev)
677{
678 struct imx_thermal_data *data = dev_get_drvdata(dev);
679 struct regmap *map = data->tempmon;
680
681 /*
682 * Need to disable thermal sensor, otherwise, when thermal core
683 * try to get temperature before thermal sensor resume, a wrong
684 * temperature will be read as the thermal sensor is powered
685 * down.
686 */
687 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
688 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
689 data->mode = THERMAL_DEVICE_DISABLED;
690 clk_disable_unprepare(data->thermal_clk);
691
692 return 0;
693}
694
695static int imx_thermal_resume(struct device *dev)
696{
697 struct imx_thermal_data *data = dev_get_drvdata(dev);
698 struct regmap *map = data->tempmon;
699 int ret;
700
701 ret = clk_prepare_enable(data->thermal_clk);
702 if (ret)
703 return ret;
704 /* Enabled thermal sensor after resume */
705 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
706 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
707 data->mode = THERMAL_DEVICE_ENABLED;
708
709 return 0;
710}
711#endif
712
713static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
714 imx_thermal_suspend, imx_thermal_resume);
715
716static struct platform_driver imx_thermal = {
717 .driver = {
718 .name = "imx_thermal",
719 .pm = &imx_thermal_pm_ops,
720 .of_match_table = of_imx_thermal_match,
721 },
722 .probe = imx_thermal_probe,
723 .remove = imx_thermal_remove,
724};
725module_platform_driver(imx_thermal);
726
727MODULE_AUTHOR("Freescale Semiconductor, Inc.");
728MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
729MODULE_LICENSE("GPL v2");
730MODULE_ALIAS("platform:imx-thermal");