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