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1d693155 DHS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) STMicroelectronics 2018 - All Rights Reserved | |
4 | * Author: David Hernandez Sanchez <david.hernandezsanchez@st.com> for | |
5 | * STMicroelectronics. | |
6 | */ | |
7 | ||
8 | #include <linux/clk.h> | |
9 | #include <linux/clk-provider.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/io.h> | |
14 | #include <linux/iopoll.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/of_address.h> | |
18 | #include <linux/of_device.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/thermal.h> | |
21 | ||
22 | #include "../thermal_core.h" | |
23 | #include "../thermal_hwmon.h" | |
24 | ||
25 | /* DTS register offsets */ | |
26 | #define DTS_CFGR1_OFFSET 0x0 | |
27 | #define DTS_T0VALR1_OFFSET 0x8 | |
28 | #define DTS_RAMPVALR_OFFSET 0X10 | |
29 | #define DTS_ITR1_OFFSET 0x14 | |
30 | #define DTS_DR_OFFSET 0x1C | |
31 | #define DTS_SR_OFFSET 0x20 | |
32 | #define DTS_ITENR_OFFSET 0x24 | |
33 | #define DTS_CIFR_OFFSET 0x28 | |
34 | ||
35 | /* DTS_CFGR1 register mask definitions */ | |
36 | #define HSREF_CLK_DIV_MASK GENMASK(30, 24) | |
37 | #define TS1_SMP_TIME_MASK GENMASK(19, 16) | |
38 | #define TS1_INTRIG_SEL_MASK GENMASK(11, 8) | |
39 | ||
40 | /* DTS_T0VALR1 register mask definitions */ | |
41 | #define TS1_T0_MASK GENMASK(17, 16) | |
42 | #define TS1_FMT0_MASK GENMASK(15, 0) | |
43 | ||
44 | /* DTS_RAMPVALR register mask definitions */ | |
45 | #define TS1_RAMP_COEFF_MASK GENMASK(15, 0) | |
46 | ||
47 | /* DTS_ITR1 register mask definitions */ | |
48 | #define TS1_HITTHD_MASK GENMASK(31, 16) | |
49 | #define TS1_LITTHD_MASK GENMASK(15, 0) | |
50 | ||
51 | /* DTS_DR register mask definitions */ | |
52 | #define TS1_MFREQ_MASK GENMASK(15, 0) | |
53 | ||
54 | /* Less significant bit position definitions */ | |
55 | #define TS1_T0_POS 16 | |
56 | #define TS1_SMP_TIME_POS 16 | |
57 | #define TS1_HITTHD_POS 16 | |
58 | #define HSREF_CLK_DIV_POS 24 | |
59 | ||
60 | /* DTS_CFGR1 bit definitions */ | |
61 | #define TS1_EN BIT(0) | |
62 | #define TS1_START BIT(4) | |
63 | #define REFCLK_SEL BIT(20) | |
64 | #define REFCLK_LSE REFCLK_SEL | |
65 | #define Q_MEAS_OPT BIT(21) | |
66 | #define CALIBRATION_CONTROL Q_MEAS_OPT | |
67 | ||
68 | /* DTS_SR bit definitions */ | |
69 | #define TS_RDY BIT(15) | |
70 | /* Bit definitions below are common for DTS_SR, DTS_ITENR and DTS_CIFR */ | |
71 | #define HIGH_THRESHOLD BIT(2) | |
72 | #define LOW_THRESHOLD BIT(1) | |
73 | ||
74 | /* Constants */ | |
75 | #define ADJUST 100 | |
76 | #define ONE_MHZ 1000000 | |
77 | #define POLL_TIMEOUT 5000 | |
78 | #define STARTUP_TIME 40 | |
79 | #define TS1_T0_VAL0 30 | |
80 | #define TS1_T0_VAL1 130 | |
81 | #define NO_HW_TRIG 0 | |
82 | ||
83 | /* The Thermal Framework expects millidegrees */ | |
84 | #define mcelsius(temp) ((temp) * 1000) | |
85 | ||
86 | /* The Sensor expects oC degrees */ | |
87 | #define celsius(temp) ((temp) / 1000) | |
88 | ||
89 | struct stm_thermal_sensor { | |
90 | struct device *dev; | |
91 | struct thermal_zone_device *th_dev; | |
92 | enum thermal_device_mode mode; | |
93 | struct clk *clk; | |
94 | int high_temp; | |
95 | int low_temp; | |
96 | int temp_critical; | |
97 | int temp_passive; | |
98 | unsigned int low_temp_enabled; | |
99 | int num_trips; | |
100 | int irq; | |
101 | unsigned int irq_enabled; | |
102 | void __iomem *base; | |
103 | int t0, fmt0, ramp_coeff; | |
104 | }; | |
105 | ||
106 | static irqreturn_t stm_thermal_alarm_irq(int irq, void *sdata) | |
107 | { | |
108 | struct stm_thermal_sensor *sensor = sdata; | |
109 | ||
110 | disable_irq_nosync(irq); | |
111 | sensor->irq_enabled = false; | |
112 | ||
113 | return IRQ_WAKE_THREAD; | |
114 | } | |
115 | ||
116 | static irqreturn_t stm_thermal_alarm_irq_thread(int irq, void *sdata) | |
117 | { | |
118 | u32 value; | |
119 | struct stm_thermal_sensor *sensor = sdata; | |
120 | ||
121 | /* read IT reason in SR and clear flags */ | |
122 | value = readl_relaxed(sensor->base + DTS_SR_OFFSET); | |
123 | ||
124 | if ((value & LOW_THRESHOLD) == LOW_THRESHOLD) | |
125 | writel_relaxed(LOW_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); | |
126 | ||
127 | if ((value & HIGH_THRESHOLD) == HIGH_THRESHOLD) | |
128 | writel_relaxed(HIGH_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); | |
129 | ||
130 | thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED); | |
131 | ||
132 | return IRQ_HANDLED; | |
133 | } | |
134 | ||
135 | static int stm_sensor_power_on(struct stm_thermal_sensor *sensor) | |
136 | { | |
137 | int ret; | |
138 | u32 value; | |
139 | ||
140 | /* Enable sensor */ | |
141 | value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); | |
142 | value |= TS1_EN; | |
143 | writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); | |
144 | ||
145 | /* | |
146 | * The DTS block can be enabled by setting TSx_EN bit in | |
147 | * DTS_CFGRx register. It requires a startup time of | |
148 | * 40μs. Use 5 ms as arbitrary timeout. | |
149 | */ | |
150 | ret = readl_poll_timeout(sensor->base + DTS_SR_OFFSET, | |
151 | value, (value & TS_RDY), | |
152 | STARTUP_TIME, POLL_TIMEOUT); | |
153 | if (ret) | |
154 | return ret; | |
155 | ||
156 | /* Start continuous measuring */ | |
157 | value = readl_relaxed(sensor->base + | |
158 | DTS_CFGR1_OFFSET); | |
159 | value |= TS1_START; | |
160 | writel_relaxed(value, sensor->base + | |
161 | DTS_CFGR1_OFFSET); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static int stm_sensor_power_off(struct stm_thermal_sensor *sensor) | |
167 | { | |
168 | u32 value; | |
169 | ||
170 | /* Stop measuring */ | |
171 | value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); | |
172 | value &= ~TS1_START; | |
173 | writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); | |
174 | ||
175 | /* Ensure stop is taken into account */ | |
176 | usleep_range(STARTUP_TIME, POLL_TIMEOUT); | |
177 | ||
178 | /* Disable sensor */ | |
179 | value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); | |
180 | value &= ~TS1_EN; | |
181 | writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); | |
182 | ||
183 | /* Ensure disable is taken into account */ | |
184 | return readl_poll_timeout(sensor->base + DTS_SR_OFFSET, value, | |
185 | !(value & TS_RDY), | |
186 | STARTUP_TIME, POLL_TIMEOUT); | |
187 | } | |
188 | ||
189 | static int stm_thermal_calibration(struct stm_thermal_sensor *sensor) | |
190 | { | |
191 | u32 value, clk_freq; | |
192 | u32 prescaler; | |
193 | ||
194 | /* Figure out prescaler value for PCLK during calibration */ | |
195 | clk_freq = clk_get_rate(sensor->clk); | |
196 | if (!clk_freq) | |
197 | return -EINVAL; | |
198 | ||
199 | prescaler = 0; | |
200 | clk_freq /= ONE_MHZ; | |
201 | if (clk_freq) { | |
202 | while (prescaler <= clk_freq) | |
203 | prescaler++; | |
204 | } | |
205 | ||
206 | value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); | |
207 | ||
208 | /* Clear prescaler */ | |
209 | value &= ~HSREF_CLK_DIV_MASK; | |
210 | ||
211 | /* Set prescaler. pclk_freq/prescaler < 1MHz */ | |
212 | value |= (prescaler << HSREF_CLK_DIV_POS); | |
213 | ||
214 | /* Select PCLK as reference clock */ | |
215 | value &= ~REFCLK_SEL; | |
216 | ||
217 | /* Set maximal sampling time for better precision */ | |
218 | value |= TS1_SMP_TIME_MASK; | |
219 | ||
220 | /* Measure with calibration */ | |
221 | value &= ~CALIBRATION_CONTROL; | |
222 | ||
223 | /* select trigger */ | |
224 | value &= ~TS1_INTRIG_SEL_MASK; | |
225 | value |= NO_HW_TRIG; | |
226 | ||
227 | writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | /* Fill in DTS structure with factory sensor values */ | |
233 | static int stm_thermal_read_factory_settings(struct stm_thermal_sensor *sensor) | |
234 | { | |
235 | /* Retrieve engineering calibration temperature */ | |
236 | sensor->t0 = readl_relaxed(sensor->base + DTS_T0VALR1_OFFSET) & | |
237 | TS1_T0_MASK; | |
238 | if (!sensor->t0) | |
239 | sensor->t0 = TS1_T0_VAL0; | |
240 | else | |
241 | sensor->t0 = TS1_T0_VAL1; | |
242 | ||
243 | /* Retrieve fmt0 and put it on Hz */ | |
244 | sensor->fmt0 = ADJUST * readl_relaxed(sensor->base + DTS_T0VALR1_OFFSET) | |
245 | & TS1_FMT0_MASK; | |
246 | ||
247 | /* Retrieve ramp coefficient */ | |
248 | sensor->ramp_coeff = readl_relaxed(sensor->base + DTS_RAMPVALR_OFFSET) & | |
249 | TS1_RAMP_COEFF_MASK; | |
250 | ||
251 | if (!sensor->fmt0 || !sensor->ramp_coeff) { | |
252 | dev_err(sensor->dev, "%s: wrong setting\n", __func__); | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | dev_dbg(sensor->dev, "%s: T0 = %doC, FMT0 = %dHz, RAMP_COEFF = %dHz/oC", | |
257 | __func__, sensor->t0, sensor->fmt0, sensor->ramp_coeff); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static int stm_thermal_calculate_threshold(struct stm_thermal_sensor *sensor, | |
263 | int temp, u32 *th) | |
264 | { | |
265 | int freqM; | |
266 | u32 sampling_time; | |
267 | ||
268 | /* Retrieve the number of periods to sample */ | |
269 | sampling_time = (readl_relaxed(sensor->base + DTS_CFGR1_OFFSET) & | |
270 | TS1_SMP_TIME_MASK) >> TS1_SMP_TIME_POS; | |
271 | ||
272 | /* Figure out the CLK_PTAT frequency for a given temperature */ | |
273 | freqM = ((temp - sensor->t0) * sensor->ramp_coeff) | |
274 | + sensor->fmt0; | |
275 | ||
276 | dev_dbg(sensor->dev, "%s: freqM for threshold = %d Hz", | |
277 | __func__, freqM); | |
278 | ||
279 | /* Figure out the threshold sample number */ | |
280 | *th = clk_get_rate(sensor->clk); | |
281 | if (!*th) | |
282 | return -EINVAL; | |
283 | ||
284 | *th = *th / freqM; | |
285 | ||
286 | *th *= sampling_time; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int stm_thermal_set_threshold(struct stm_thermal_sensor *sensor) | |
292 | { | |
293 | u32 value, th; | |
294 | int ret; | |
295 | ||
296 | value = readl_relaxed(sensor->base + DTS_ITR1_OFFSET); | |
297 | ||
298 | /* Erase threshold content */ | |
299 | value &= ~(TS1_LITTHD_MASK | TS1_HITTHD_MASK); | |
300 | ||
301 | /* Retrieve the sample threshold number th for a given temperature */ | |
302 | ret = stm_thermal_calculate_threshold(sensor, sensor->high_temp, &th); | |
303 | if (ret) | |
304 | return ret; | |
305 | ||
306 | value |= th & TS1_LITTHD_MASK; | |
307 | ||
308 | if (sensor->low_temp_enabled) { | |
309 | /* Retrieve the sample threshold */ | |
310 | ret = stm_thermal_calculate_threshold(sensor, sensor->low_temp, | |
311 | &th); | |
312 | if (ret) | |
313 | return ret; | |
314 | ||
315 | value |= (TS1_HITTHD_MASK & (th << TS1_HITTHD_POS)); | |
316 | } | |
317 | ||
318 | /* Write value on the Low interrupt threshold */ | |
319 | writel_relaxed(value, sensor->base + DTS_ITR1_OFFSET); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | /* Disable temperature interrupt */ | |
325 | static int stm_disable_irq(struct stm_thermal_sensor *sensor) | |
326 | { | |
327 | u32 value; | |
328 | ||
329 | /* Disable IT generation for low and high thresholds */ | |
330 | value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET); | |
331 | writel_relaxed(value & ~(LOW_THRESHOLD | HIGH_THRESHOLD), | |
332 | sensor->base + DTS_ITENR_OFFSET); | |
333 | ||
334 | dev_dbg(sensor->dev, "%s: IT disabled on sensor side", __func__); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | /* Enable temperature interrupt */ | |
340 | static int stm_enable_irq(struct stm_thermal_sensor *sensor) | |
341 | { | |
342 | u32 value; | |
343 | ||
344 | /* | |
345 | * Code below enables High temperature threshold using a low threshold | |
346 | * sampling value | |
347 | */ | |
348 | ||
349 | /* Make sure LOW_THRESHOLD IT is clear before enabling */ | |
350 | writel_relaxed(LOW_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); | |
351 | ||
352 | /* Enable IT generation for low threshold */ | |
353 | value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET); | |
354 | value |= LOW_THRESHOLD; | |
355 | ||
356 | /* Enable the low temperature threshold if needed */ | |
357 | if (sensor->low_temp_enabled) { | |
358 | /* Make sure HIGH_THRESHOLD IT is clear before enabling */ | |
359 | writel_relaxed(HIGH_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); | |
360 | ||
361 | /* Enable IT generation for high threshold */ | |
362 | value |= HIGH_THRESHOLD; | |
363 | } | |
364 | ||
365 | /* Enable thresholds */ | |
366 | writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET); | |
367 | ||
368 | dev_dbg(sensor->dev, "%s: IT enabled on sensor side", __func__); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static int stm_thermal_update_threshold(struct stm_thermal_sensor *sensor) | |
374 | { | |
375 | int ret; | |
376 | ||
377 | sensor->mode = THERMAL_DEVICE_DISABLED; | |
378 | ||
379 | ret = stm_sensor_power_off(sensor); | |
380 | if (ret) | |
381 | return ret; | |
382 | ||
383 | ret = stm_disable_irq(sensor); | |
384 | if (ret) | |
385 | return ret; | |
386 | ||
387 | ret = stm_thermal_set_threshold(sensor); | |
388 | if (ret) | |
389 | return ret; | |
390 | ||
391 | ret = stm_enable_irq(sensor); | |
392 | if (ret) | |
393 | return ret; | |
394 | ||
395 | ret = stm_sensor_power_on(sensor); | |
396 | if (ret) | |
397 | return ret; | |
398 | ||
399 | sensor->mode = THERMAL_DEVICE_ENABLED; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | /* Callback to get temperature from HW */ | |
405 | static int stm_thermal_get_temp(void *data, int *temp) | |
406 | { | |
407 | struct stm_thermal_sensor *sensor = data; | |
408 | u32 sampling_time; | |
409 | int freqM, ret; | |
410 | ||
411 | if (sensor->mode != THERMAL_DEVICE_ENABLED) | |
412 | return -EAGAIN; | |
413 | ||
414 | /* Retrieve the number of samples */ | |
415 | ret = readl_poll_timeout(sensor->base + DTS_DR_OFFSET, freqM, | |
416 | (freqM & TS1_MFREQ_MASK), STARTUP_TIME, | |
417 | POLL_TIMEOUT); | |
418 | ||
419 | if (ret) | |
420 | return ret; | |
421 | ||
422 | if (!freqM) | |
423 | return -ENODATA; | |
424 | ||
425 | /* Retrieve the number of periods sampled */ | |
426 | sampling_time = (readl_relaxed(sensor->base + DTS_CFGR1_OFFSET) & | |
427 | TS1_SMP_TIME_MASK) >> TS1_SMP_TIME_POS; | |
428 | ||
429 | /* Figure out the number of samples per period */ | |
430 | freqM /= sampling_time; | |
431 | ||
432 | /* Figure out the CLK_PTAT frequency */ | |
433 | freqM = clk_get_rate(sensor->clk) / freqM; | |
434 | if (!freqM) | |
435 | return -EINVAL; | |
436 | ||
437 | dev_dbg(sensor->dev, "%s: freqM=%d\n", __func__, freqM); | |
438 | ||
439 | /* Figure out the temperature in mili celsius */ | |
440 | *temp = mcelsius(sensor->t0 + ((freqM - sensor->fmt0) / | |
441 | sensor->ramp_coeff)); | |
442 | ||
443 | dev_dbg(sensor->dev, "%s: temperature = %d millicelsius", | |
444 | __func__, *temp); | |
445 | ||
446 | /* Update thresholds */ | |
447 | if (sensor->num_trips > 1) { | |
448 | /* Update alarm threshold value to next higher trip point */ | |
449 | if (sensor->high_temp == sensor->temp_passive && | |
450 | celsius(*temp) >= sensor->temp_passive) { | |
451 | sensor->high_temp = sensor->temp_critical; | |
452 | sensor->low_temp = sensor->temp_passive; | |
453 | sensor->low_temp_enabled = true; | |
454 | ret = stm_thermal_update_threshold(sensor); | |
455 | if (ret) | |
456 | return ret; | |
457 | } | |
458 | ||
459 | if (sensor->high_temp == sensor->temp_critical && | |
460 | celsius(*temp) < sensor->temp_passive) { | |
461 | sensor->high_temp = sensor->temp_passive; | |
462 | sensor->low_temp_enabled = false; | |
463 | ret = stm_thermal_update_threshold(sensor); | |
464 | if (ret) | |
465 | return ret; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Re-enable alarm IRQ if temperature below critical | |
470 | * temperature | |
471 | */ | |
472 | if (!sensor->irq_enabled && | |
473 | (celsius(*temp) < sensor->temp_critical)) { | |
474 | sensor->irq_enabled = true; | |
475 | enable_irq(sensor->irq); | |
476 | } | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | /* Registers DTS irq to be visible by GIC */ | |
483 | static int stm_register_irq(struct stm_thermal_sensor *sensor) | |
484 | { | |
485 | struct device *dev = sensor->dev; | |
486 | struct platform_device *pdev = to_platform_device(dev); | |
487 | int ret; | |
488 | ||
489 | sensor->irq = platform_get_irq(pdev, 0); | |
490 | if (sensor->irq < 0) { | |
491 | dev_err(dev, "%s: Unable to find IRQ\n", __func__); | |
492 | return sensor->irq; | |
493 | } | |
494 | ||
495 | ret = devm_request_threaded_irq(dev, sensor->irq, | |
496 | stm_thermal_alarm_irq, | |
497 | stm_thermal_alarm_irq_thread, | |
498 | IRQF_ONESHOT, | |
499 | dev->driver->name, sensor); | |
500 | if (ret) { | |
501 | dev_err(dev, "%s: Failed to register IRQ %d\n", __func__, | |
502 | sensor->irq); | |
503 | return ret; | |
504 | } | |
505 | ||
506 | sensor->irq_enabled = true; | |
507 | ||
508 | dev_dbg(dev, "%s: thermal IRQ registered", __func__); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int stm_thermal_sensor_off(struct stm_thermal_sensor *sensor) | |
514 | { | |
515 | int ret; | |
516 | ||
517 | ret = stm_sensor_power_off(sensor); | |
518 | if (ret) | |
519 | return ret; | |
520 | ||
521 | clk_disable_unprepare(sensor->clk); | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | static int stm_thermal_prepare(struct stm_thermal_sensor *sensor) | |
527 | { | |
528 | int ret; | |
529 | struct device *dev = sensor->dev; | |
530 | ||
531 | ret = clk_prepare_enable(sensor->clk); | |
532 | if (ret) | |
533 | return ret; | |
534 | ||
3c9d0820 DHS |
535 | ret = stm_thermal_read_factory_settings(sensor); |
536 | if (ret) | |
537 | goto thermal_unprepare; | |
538 | ||
1d693155 DHS |
539 | ret = stm_thermal_calibration(sensor); |
540 | if (ret) | |
541 | goto thermal_unprepare; | |
542 | ||
543 | /* Set threshold(s) for IRQ */ | |
544 | ret = stm_thermal_set_threshold(sensor); | |
545 | if (ret) | |
546 | goto thermal_unprepare; | |
547 | ||
548 | ret = stm_enable_irq(sensor); | |
549 | if (ret) | |
550 | goto thermal_unprepare; | |
551 | ||
552 | ret = stm_sensor_power_on(sensor); | |
553 | if (ret) { | |
554 | dev_err(dev, "%s: failed to power on sensor\n", __func__); | |
555 | goto irq_disable; | |
556 | } | |
557 | ||
558 | return 0; | |
559 | ||
560 | irq_disable: | |
561 | stm_disable_irq(sensor); | |
562 | ||
563 | thermal_unprepare: | |
564 | clk_disable_unprepare(sensor->clk); | |
565 | ||
566 | return ret; | |
567 | } | |
568 | ||
569 | #ifdef CONFIG_PM_SLEEP | |
570 | static int stm_thermal_suspend(struct device *dev) | |
571 | { | |
572 | int ret; | |
573 | struct platform_device *pdev = to_platform_device(dev); | |
574 | struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
575 | ||
576 | ret = stm_thermal_sensor_off(sensor); | |
577 | if (ret) | |
578 | return ret; | |
579 | ||
580 | sensor->mode = THERMAL_DEVICE_DISABLED; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | static int stm_thermal_resume(struct device *dev) | |
586 | { | |
587 | int ret; | |
588 | struct platform_device *pdev = to_platform_device(dev); | |
589 | struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
590 | ||
591 | ret = stm_thermal_prepare(sensor); | |
592 | if (ret) | |
593 | return ret; | |
594 | ||
595 | sensor->mode = THERMAL_DEVICE_ENABLED; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | #endif /* CONFIG_PM_SLEEP */ | |
600 | ||
601 | SIMPLE_DEV_PM_OPS(stm_thermal_pm_ops, stm_thermal_suspend, stm_thermal_resume); | |
602 | ||
603 | static const struct thermal_zone_of_device_ops stm_tz_ops = { | |
604 | .get_temp = stm_thermal_get_temp, | |
605 | }; | |
606 | ||
607 | static const struct of_device_id stm_thermal_of_match[] = { | |
608 | { .compatible = "st,stm32-thermal"}, | |
609 | { /* sentinel */ } | |
610 | }; | |
611 | MODULE_DEVICE_TABLE(of, stm_thermal_of_match); | |
612 | ||
613 | static int stm_thermal_probe(struct platform_device *pdev) | |
614 | { | |
615 | struct stm_thermal_sensor *sensor; | |
616 | struct resource *res; | |
617 | const struct thermal_trip *trip; | |
618 | void __iomem *base; | |
619 | int ret, i; | |
620 | ||
621 | if (!pdev->dev.of_node) { | |
622 | dev_err(&pdev->dev, "%s: device tree node not found\n", | |
623 | __func__); | |
624 | return -EINVAL; | |
625 | } | |
626 | ||
627 | sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); | |
628 | if (!sensor) | |
629 | return -ENOMEM; | |
630 | ||
631 | platform_set_drvdata(pdev, sensor); | |
632 | ||
633 | sensor->dev = &pdev->dev; | |
634 | ||
635 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
636 | base = devm_ioremap_resource(&pdev->dev, res); | |
637 | if (IS_ERR(base)) | |
638 | return PTR_ERR(base); | |
639 | ||
640 | /* Populate sensor */ | |
641 | sensor->base = base; | |
642 | ||
1d693155 DHS |
643 | sensor->clk = devm_clk_get(&pdev->dev, "pclk"); |
644 | if (IS_ERR(sensor->clk)) { | |
645 | dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n", | |
646 | __func__); | |
647 | return PTR_ERR(sensor->clk); | |
648 | } | |
649 | ||
650 | /* Register IRQ into GIC */ | |
651 | ret = stm_register_irq(sensor); | |
652 | if (ret) | |
653 | return ret; | |
654 | ||
655 | sensor->th_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, | |
656 | sensor, | |
657 | &stm_tz_ops); | |
658 | ||
659 | if (IS_ERR(sensor->th_dev)) { | |
660 | dev_err(&pdev->dev, "%s: thermal zone sensor registering KO\n", | |
661 | __func__); | |
662 | ret = PTR_ERR(sensor->th_dev); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | if (!sensor->th_dev->ops->get_crit_temp) { | |
667 | /* Critical point must be provided */ | |
668 | ret = -EINVAL; | |
669 | goto err_tz; | |
670 | } | |
671 | ||
672 | ret = sensor->th_dev->ops->get_crit_temp(sensor->th_dev, | |
673 | &sensor->temp_critical); | |
674 | if (ret) { | |
675 | dev_err(&pdev->dev, | |
676 | "Not able to read critical_temp: %d\n", ret); | |
677 | goto err_tz; | |
678 | } | |
679 | ||
680 | sensor->temp_critical = celsius(sensor->temp_critical); | |
681 | ||
682 | /* Set thresholds for IRQ */ | |
683 | sensor->high_temp = sensor->temp_critical; | |
684 | ||
685 | trip = of_thermal_get_trip_points(sensor->th_dev); | |
686 | sensor->num_trips = of_thermal_get_ntrips(sensor->th_dev); | |
687 | ||
688 | /* Find out passive temperature if it exists */ | |
689 | for (i = (sensor->num_trips - 1); i >= 0; i--) { | |
690 | if (trip[i].type == THERMAL_TRIP_PASSIVE) { | |
691 | sensor->temp_passive = celsius(trip[i].temperature); | |
692 | /* Update high temperature threshold */ | |
693 | sensor->high_temp = sensor->temp_passive; | |
694 | } | |
695 | } | |
696 | ||
697 | /* | |
698 | * Ensure low_temp_enabled flag is disabled. | |
699 | * By disabling low_temp_enabled, low threshold IT will not be | |
700 | * configured neither enabled because it is not needed as high | |
701 | * threshold is set on the lowest temperature trip point after | |
702 | * probe. | |
703 | */ | |
704 | sensor->low_temp_enabled = false; | |
705 | ||
706 | /* Configure and enable HW sensor */ | |
707 | ret = stm_thermal_prepare(sensor); | |
708 | if (ret) { | |
709 | dev_err(&pdev->dev, | |
710 | "Not able to enable sensor: %d\n", ret); | |
711 | goto err_tz; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Thermal_zone doesn't enable hwmon as default, | |
716 | * enable it here | |
717 | */ | |
718 | sensor->th_dev->tzp->no_hwmon = false; | |
719 | ret = thermal_add_hwmon_sysfs(sensor->th_dev); | |
720 | if (ret) | |
721 | goto err_tz; | |
722 | ||
723 | sensor->mode = THERMAL_DEVICE_ENABLED; | |
724 | ||
725 | dev_info(&pdev->dev, "%s: Driver initialized successfully\n", | |
726 | __func__); | |
727 | ||
728 | return 0; | |
729 | ||
730 | err_tz: | |
731 | thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev); | |
732 | return ret; | |
733 | } | |
734 | ||
735 | static int stm_thermal_remove(struct platform_device *pdev) | |
736 | { | |
737 | struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
738 | ||
739 | stm_thermal_sensor_off(sensor); | |
740 | thermal_remove_hwmon_sysfs(sensor->th_dev); | |
741 | thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev); | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | static struct platform_driver stm_thermal_driver = { | |
747 | .driver = { | |
748 | .name = "stm_thermal", | |
749 | .pm = &stm_thermal_pm_ops, | |
750 | .of_match_table = stm_thermal_of_match, | |
751 | }, | |
752 | .probe = stm_thermal_probe, | |
753 | .remove = stm_thermal_remove, | |
754 | }; | |
755 | module_platform_driver(stm_thermal_driver); | |
756 | ||
757 | MODULE_DESCRIPTION("STMicroelectronics STM32 Thermal Sensor Driver"); | |
758 | MODULE_AUTHOR("David Hernandez Sanchez <david.hernandezsanchez@st.com>"); | |
759 | MODULE_LICENSE("GPL v2"); | |
760 | MODULE_ALIAS("platform:stm_thermal"); |