1 // SPDX-License-Identifier: GPL-2.0
3 // Copyright 2013 Freescale Semiconductor, Inc.
6 #include <linux/cpufreq.h>
7 #include <linux/cpu_cooling.h>
8 #include <linux/delay.h>
9 #include <linux/interrupt.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.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>
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)
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)
42 #define IMX6_TEMPSENSE1 0x0190
43 #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
44 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
46 #define OCOTP_MEM0 0x0480
47 #define OCOTP_ANA1 0x04e0
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
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
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
75 /* The driver supports 1 passive trip point and 1 critical trip point */
76 enum imx_thermal_trip {
81 #define IMX_POLLING_DELAY 2000 /* millisecond */
82 #define IMX_PASSIVE_DELAY 1000
84 #define TEMPMON_IMX6Q 1
85 #define TEMPMON_IMX6SX 2
86 #define TEMPMON_IMX7D 3
88 struct thermal_soc_data {
93 u32 measure_temp_mask;
95 u32 measure_freq_ctrl;
96 u32 measure_freq_mask;
97 u32 measure_freq_shift;
101 u32 temp_value_shift;
104 u32 panic_alarm_ctrl;
105 u32 panic_alarm_mask;
106 u32 panic_alarm_shift;
110 u32 high_alarm_shift;
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 },
123 static struct thermal_soc_data thermal_imx6q_data = {
124 .version = TEMPMON_IMX6Q,
126 .sensor_ctrl = IMX6_TEMPSENSE0,
127 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
128 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
130 .measure_freq_ctrl = IMX6_TEMPSENSE1,
131 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
132 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
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,
139 .high_alarm_ctrl = IMX6_TEMPSENSE0,
140 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
141 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
144 static struct thermal_soc_data thermal_imx6sx_data = {
145 .version = TEMPMON_IMX6SX,
147 .sensor_ctrl = IMX6_TEMPSENSE0,
148 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
149 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
151 .measure_freq_ctrl = IMX6_TEMPSENSE1,
152 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
153 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
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,
160 .high_alarm_ctrl = IMX6_TEMPSENSE0,
161 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
162 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
164 .panic_alarm_ctrl = IMX6_TEMPSENSE2,
165 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
166 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
168 .low_alarm_ctrl = IMX6_TEMPSENSE2,
169 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
170 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
173 static struct thermal_soc_data thermal_imx7d_data = {
174 .version = TEMPMON_IMX7D,
176 .sensor_ctrl = IMX7_TEMPSENSE1,
177 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
178 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
180 .measure_freq_ctrl = IMX7_TEMPSENSE1,
181 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
182 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
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,
189 .panic_alarm_ctrl = IMX7_TEMPSENSE1,
190 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
191 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
193 .high_alarm_ctrl = IMX7_TEMPSENSE0,
194 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
195 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
197 .low_alarm_ctrl = IMX7_TEMPSENSE0,
198 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
199 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
202 struct imx_thermal_data {
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() */
214 struct clk *thermal_clk;
215 const struct thermal_soc_data *socdata;
216 const char *temp_grade;
219 static void imx_set_panic_temp(struct imx_thermal_data *data,
222 const struct thermal_soc_data *soc_data = data->socdata;
223 struct regmap *map = data->tempmon;
226 critical_value = (data->c2 - panic_temp) / data->c1;
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);
234 static void imx_set_alarm_temp(struct imx_thermal_data *data,
237 struct regmap *map = data->tempmon;
238 const struct thermal_soc_data *soc_data = data->socdata;
241 data->alarm_temp = alarm_temp;
243 if (data->socdata->version == TEMPMON_IMX7D)
244 alarm_value = alarm_temp / 1000 + data->c1 - 25;
246 alarm_value = (data->c2 - alarm_temp) / data->c1;
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);
254 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
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;
263 ret = pm_runtime_resume_and_get(data->dev);
267 regmap_read(map, soc_data->temp_data, &val);
269 if ((val & soc_data->temp_valid_mask) == 0)
272 n_meas = (val & soc_data->temp_value_mask)
273 >> soc_data->temp_value_shift;
275 /* See imx_init_calib() for formula derivation */
276 if (data->socdata->version == TEMPMON_IMX7D)
277 *temp = (n_meas - data->c1 + 25) * 1000;
279 *temp = data->c2 - n_meas * data->c1;
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);
294 if (*temp != data->last_temp) {
295 dev_dbg(data->dev, "millicelsius: %d\n", *temp);
296 data->last_temp = *temp;
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);
305 pm_runtime_put(data->dev);
310 static int imx_change_mode(struct thermal_zone_device *tz,
311 enum thermal_device_mode mode)
313 struct imx_thermal_data *data = thermal_zone_device_priv(tz);
315 if (mode == THERMAL_DEVICE_ENABLED) {
316 pm_runtime_get(data->dev);
318 if (!data->irq_enabled) {
319 data->irq_enabled = true;
320 enable_irq(data->irq);
323 pm_runtime_put(data->dev);
325 if (data->irq_enabled) {
326 disable_irq(data->irq);
327 data->irq_enabled = false;
334 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip_id,
337 struct imx_thermal_data *data = thermal_zone_device_priv(tz);
338 struct thermal_trip trip;
341 ret = pm_runtime_resume_and_get(data->dev);
345 ret = __thermal_zone_get_trip(tz, trip_id, &trip);
349 /* do not allow changing critical threshold */
350 if (trip.type == THERMAL_TRIP_CRITICAL)
353 /* do not allow passive to be set higher than critical */
354 if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature)
357 imx_set_alarm_temp(data, temp);
358 trips[IMX_TRIP_PASSIVE].temperature = temp;
360 pm_runtime_put(data->dev);
365 static int imx_bind(struct thermal_zone_device *tz,
366 struct thermal_cooling_device *cdev)
368 return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
371 THERMAL_WEIGHT_DEFAULT);
374 static int imx_unbind(struct thermal_zone_device *tz,
375 struct thermal_cooling_device *cdev)
377 return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
380 static struct thermal_zone_device_ops imx_tz_ops = {
382 .unbind = imx_unbind,
383 .get_temp = imx_get_temp,
384 .change_mode = imx_change_mode,
385 .set_trip_temp = imx_set_trip_temp,
388 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
390 struct imx_thermal_data *data = platform_get_drvdata(pdev);
394 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
395 dev_err(&pdev->dev, "invalid sensor calibration data\n");
400 * On i.MX7D, we only use the calibration data at 25C to get the temp,
401 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
403 if (data->socdata->version == TEMPMON_IMX7D) {
404 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
409 * The sensor is calibrated at 25 °C (aka T1) and the value measured
410 * (aka N1) at this temperature is provided in bits [31:20] in the
411 * i.MX's OCOTP value ANA1.
412 * To find the actual temperature T, the following formula has to be used
413 * when reading value n from the sensor:
415 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
416 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
417 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
422 * T1' = 28.580661 °C
423 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
424 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
427 n1 = ocotp_ana1 >> 20;
429 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
430 temp64 *= 1000; /* to get result in °mC */
431 do_div(temp64, 15423 * n1 - 4148468);
433 data->c2 = n1 * data->c1 + 28581;
438 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
440 struct imx_thermal_data *data = platform_get_drvdata(pdev);
442 /* The maximum die temp is specified by the Temperature Grade */
443 switch ((ocotp_mem0 >> 6) & 0x3) {
444 case 0: /* Commercial (0 to 95 °C) */
445 data->temp_grade = "Commercial";
446 data->temp_max = 95000;
448 case 1: /* Extended Commercial (-20 °C to 105 °C) */
449 data->temp_grade = "Extended Commercial";
450 data->temp_max = 105000;
452 case 2: /* Industrial (-40 °C to 105 °C) */
453 data->temp_grade = "Industrial";
454 data->temp_max = 105000;
456 case 3: /* Automotive (-40 °C to 125 °C) */
457 data->temp_grade = "Automotive";
458 data->temp_max = 125000;
463 * Set the critical trip point at 5 °C under max
464 * Set the passive trip point at 10 °C under max (changeable via sysfs)
466 trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10);
467 trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5);
470 static int imx_init_from_tempmon_data(struct platform_device *pdev)
476 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
480 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
484 ret = regmap_read(map, OCOTP_ANA1, &val);
486 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
489 ret = imx_init_calib(pdev, val);
493 ret = regmap_read(map, OCOTP_MEM0, &val);
495 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
498 imx_init_temp_grade(pdev, val);
503 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
508 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
512 ret = imx_init_calib(pdev, val);
516 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
519 imx_init_temp_grade(pdev, val);
524 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
526 struct imx_thermal_data *data = dev;
528 disable_irq_nosync(irq);
529 data->irq_enabled = false;
531 return IRQ_WAKE_THREAD;
534 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
536 struct imx_thermal_data *data = dev;
538 dev_dbg(data->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000);
540 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
545 static const struct of_device_id of_imx_thermal_match[] = {
546 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
547 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
548 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
551 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
553 #ifdef CONFIG_CPU_FREQ
555 * Create cooling device in case no #cooling-cells property is available in
558 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
560 struct device_node *np;
563 data->policy = cpufreq_cpu_get(0);
565 pr_debug("%s: CPUFreq policy not found\n", __func__);
566 return -EPROBE_DEFER;
569 np = of_get_cpu_node(data->policy->cpu, NULL);
571 if (!np || !of_property_present(np, "#cooling-cells")) {
572 data->cdev = cpufreq_cooling_register(data->policy);
573 if (IS_ERR(data->cdev)) {
574 ret = PTR_ERR(data->cdev);
575 cpufreq_cpu_put(data->policy);
584 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
586 cpufreq_cooling_unregister(data->cdev);
587 cpufreq_cpu_put(data->policy);
592 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
597 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
602 static int imx_thermal_probe(struct platform_device *pdev)
604 struct imx_thermal_data *data;
609 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
613 data->dev = &pdev->dev;
615 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
618 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
623 data->socdata = of_device_get_match_data(&pdev->dev);
624 if (!data->socdata) {
625 dev_err(&pdev->dev, "no device match found\n");
629 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
630 if (data->socdata->version == TEMPMON_IMX6SX) {
631 regmap_write(map, IMX6_MISC1 + REG_CLR,
632 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
633 | IMX6_MISC1_IRQ_TEMPPANIC);
635 * reset value of LOW ALARM is incorrect, set it to lowest
636 * value to avoid false trigger of low alarm.
638 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
639 data->socdata->low_alarm_mask);
642 data->irq = platform_get_irq(pdev, 0);
646 platform_set_drvdata(pdev, data);
648 if (of_property_present(pdev->dev.of_node, "nvmem-cells")) {
649 ret = imx_init_from_nvmem_cells(pdev);
651 return dev_err_probe(&pdev->dev, ret,
652 "failed to init from nvmem\n");
654 ret = imx_init_from_tempmon_data(pdev);
656 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
661 /* Make sure sensor is in known good state for measurements */
662 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
663 data->socdata->power_down_mask);
664 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
665 data->socdata->measure_temp_mask);
666 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
667 data->socdata->measure_freq_mask);
668 if (data->socdata->version != TEMPMON_IMX7D)
669 regmap_write(map, IMX6_MISC0 + REG_SET,
670 IMX6_MISC0_REFTOP_SELBIASOFF);
671 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
672 data->socdata->power_down_mask);
674 ret = imx_thermal_register_legacy_cooling(data);
676 return dev_err_probe(&pdev->dev, ret,
677 "failed to register cpufreq cooling device\n");
679 data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
680 if (IS_ERR(data->thermal_clk)) {
681 ret = PTR_ERR(data->thermal_clk);
682 if (ret != -EPROBE_DEFER)
684 "failed to get thermal clk: %d\n", ret);
689 * Thermal sensor needs clk on to get correct value, normally
690 * we should enable its clk before taking measurement and disable
691 * clk after measurement is done, but if alarm function is enabled,
692 * hardware will auto measure the temperature periodically, so we
693 * need to keep the clk always on for alarm function.
695 ret = clk_prepare_enable(data->thermal_clk);
697 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
701 data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone",
708 if (IS_ERR(data->tz)) {
709 ret = PTR_ERR(data->tz);
711 "failed to register thermal zone device %d\n", ret);
715 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
716 " critical:%dC passive:%dC\n", data->temp_grade,
717 data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000,
718 trips[IMX_TRIP_PASSIVE].temperature / 1000);
720 /* Enable measurements at ~ 10 Hz */
721 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
722 data->socdata->measure_freq_mask);
723 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
724 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
725 measure_freq << data->socdata->measure_freq_shift);
726 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature);
728 if (data->socdata->version == TEMPMON_IMX6SX)
729 imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature);
731 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
732 data->socdata->power_down_mask);
733 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
734 data->socdata->measure_temp_mask);
735 /* After power up, we need a delay before first access can be done. */
736 usleep_range(20, 50);
738 /* the core was configured and enabled just before */
739 pm_runtime_set_active(&pdev->dev);
740 pm_runtime_enable(data->dev);
742 ret = pm_runtime_resume_and_get(data->dev);
744 goto disable_runtime_pm;
746 data->irq_enabled = true;
747 ret = thermal_zone_device_enable(data->tz);
749 goto thermal_zone_unregister;
751 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
752 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
753 0, "imx_thermal", data);
755 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
756 goto thermal_zone_unregister;
759 pm_runtime_put(data->dev);
763 thermal_zone_unregister:
764 thermal_zone_device_unregister(data->tz);
766 pm_runtime_put_noidle(data->dev);
767 pm_runtime_disable(data->dev);
769 clk_disable_unprepare(data->thermal_clk);
771 imx_thermal_unregister_legacy_cooling(data);
776 static void imx_thermal_remove(struct platform_device *pdev)
778 struct imx_thermal_data *data = platform_get_drvdata(pdev);
780 pm_runtime_put_noidle(data->dev);
781 pm_runtime_disable(data->dev);
783 thermal_zone_device_unregister(data->tz);
784 imx_thermal_unregister_legacy_cooling(data);
787 static int __maybe_unused imx_thermal_suspend(struct device *dev)
789 struct imx_thermal_data *data = dev_get_drvdata(dev);
793 * Need to disable thermal sensor, otherwise, when thermal core
794 * try to get temperature before thermal sensor resume, a wrong
795 * temperature will be read as the thermal sensor is powered
796 * down. This is done in change_mode() operation called from
797 * thermal_zone_device_disable()
799 ret = thermal_zone_device_disable(data->tz);
803 return pm_runtime_force_suspend(data->dev);
806 static int __maybe_unused imx_thermal_resume(struct device *dev)
808 struct imx_thermal_data *data = dev_get_drvdata(dev);
811 ret = pm_runtime_force_resume(data->dev);
814 /* Enabled thermal sensor after resume */
815 return thermal_zone_device_enable(data->tz);
818 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
820 struct imx_thermal_data *data = dev_get_drvdata(dev);
821 const struct thermal_soc_data *socdata = data->socdata;
822 struct regmap *map = data->tempmon;
825 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
826 socdata->measure_temp_mask);
830 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
831 socdata->power_down_mask);
835 clk_disable_unprepare(data->thermal_clk);
840 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
842 struct imx_thermal_data *data = dev_get_drvdata(dev);
843 const struct thermal_soc_data *socdata = data->socdata;
844 struct regmap *map = data->tempmon;
847 ret = clk_prepare_enable(data->thermal_clk);
851 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
852 socdata->power_down_mask);
856 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
857 socdata->measure_temp_mask);
862 * According to the temp sensor designers, it may require up to ~17us
863 * to complete a measurement.
865 usleep_range(20, 50);
870 static const struct dev_pm_ops imx_thermal_pm_ops = {
871 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
872 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
873 imx_thermal_runtime_resume, NULL)
876 static struct platform_driver imx_thermal = {
878 .name = "imx_thermal",
879 .pm = &imx_thermal_pm_ops,
880 .of_match_table = of_imx_thermal_match,
882 .probe = imx_thermal_probe,
883 .remove_new = imx_thermal_remove,
885 module_platform_driver(imx_thermal);
887 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
888 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
889 MODULE_LICENSE("GPL v2");
890 MODULE_ALIAS("platform:imx-thermal");