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/of_device.h>
15 #include <linux/regmap.h>
16 #include <linux/thermal.h>
17 #include <linux/nvmem-consumer.h>
24 #define IMX6_MISC0 0x0150
25 #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3)
26 #define IMX6_MISC1 0x0160
27 #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29)
28 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
29 #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28)
30 #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27)
32 #define IMX6_TEMPSENSE0 0x0180
33 #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20
34 #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)
35 #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8
36 #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)
37 #define IMX6_TEMPSENSE0_FINISHED (1 << 2)
38 #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)
39 #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)
41 #define IMX6_TEMPSENSE1 0x0190
42 #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
43 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
45 #define OCOTP_MEM0 0x0480
46 #define OCOTP_ANA1 0x04e0
48 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
49 #define IMX6_TEMPSENSE2 0x0290
50 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0
51 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff
52 #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16
53 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
56 #define IMX7_ANADIG_DIGPROG 0x800
57 #define IMX7_TEMPSENSE0 0x300
58 #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18
59 #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)
60 #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9
61 #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)
62 #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0
63 #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff
65 #define IMX7_TEMPSENSE1 0x310
66 #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16
67 #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)
68 #define IMX7_TEMPSENSE1_FINISHED (1 << 11)
69 #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)
70 #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)
71 #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0
72 #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff
74 /* The driver supports 1 passive trip point and 1 critical trip point */
75 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_soc_data thermal_imx6q_data = {
118 .version = TEMPMON_IMX6Q,
120 .sensor_ctrl = IMX6_TEMPSENSE0,
121 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
122 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
124 .measure_freq_ctrl = IMX6_TEMPSENSE1,
125 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
126 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
128 .temp_data = IMX6_TEMPSENSE0,
129 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
130 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
131 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
133 .high_alarm_ctrl = IMX6_TEMPSENSE0,
134 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
135 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
138 static struct thermal_soc_data thermal_imx6sx_data = {
139 .version = TEMPMON_IMX6SX,
141 .sensor_ctrl = IMX6_TEMPSENSE0,
142 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
143 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
145 .measure_freq_ctrl = IMX6_TEMPSENSE1,
146 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
147 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
149 .temp_data = IMX6_TEMPSENSE0,
150 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
151 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
152 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
154 .high_alarm_ctrl = IMX6_TEMPSENSE0,
155 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
156 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
158 .panic_alarm_ctrl = IMX6_TEMPSENSE2,
159 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
160 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
162 .low_alarm_ctrl = IMX6_TEMPSENSE2,
163 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
164 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
167 static struct thermal_soc_data thermal_imx7d_data = {
168 .version = TEMPMON_IMX7D,
170 .sensor_ctrl = IMX7_TEMPSENSE1,
171 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
172 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
174 .measure_freq_ctrl = IMX7_TEMPSENSE1,
175 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
176 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
178 .temp_data = IMX7_TEMPSENSE1,
179 .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
180 .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
181 .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
183 .panic_alarm_ctrl = IMX7_TEMPSENSE1,
184 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
185 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
187 .high_alarm_ctrl = IMX7_TEMPSENSE0,
188 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
189 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
191 .low_alarm_ctrl = IMX7_TEMPSENSE0,
192 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
193 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
196 struct imx_thermal_data {
197 struct cpufreq_policy *policy;
198 struct thermal_zone_device *tz;
199 struct thermal_cooling_device *cdev;
200 enum thermal_device_mode mode;
201 struct regmap *tempmon;
202 u32 c1, c2; /* See formula in imx_init_calib() */
210 struct clk *thermal_clk;
211 const struct thermal_soc_data *socdata;
212 const char *temp_grade;
215 static void imx_set_panic_temp(struct imx_thermal_data *data,
218 const struct thermal_soc_data *soc_data = data->socdata;
219 struct regmap *map = data->tempmon;
222 critical_value = (data->c2 - panic_temp) / data->c1;
224 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
225 soc_data->panic_alarm_mask);
226 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
227 critical_value << soc_data->panic_alarm_shift);
230 static void imx_set_alarm_temp(struct imx_thermal_data *data,
233 struct regmap *map = data->tempmon;
234 const struct thermal_soc_data *soc_data = data->socdata;
237 data->alarm_temp = alarm_temp;
239 if (data->socdata->version == TEMPMON_IMX7D)
240 alarm_value = alarm_temp / 1000 + data->c1 - 25;
242 alarm_value = (data->c2 - alarm_temp) / data->c1;
244 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
245 soc_data->high_alarm_mask);
246 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
247 alarm_value << soc_data->high_alarm_shift);
250 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
252 struct imx_thermal_data *data = tz->devdata;
253 const struct thermal_soc_data *soc_data = data->socdata;
254 struct regmap *map = data->tempmon;
259 if (data->mode == THERMAL_DEVICE_ENABLED) {
260 /* Check if a measurement is currently in progress */
261 regmap_read(map, soc_data->temp_data, &val);
262 wait = !(val & soc_data->temp_valid_mask);
265 * Every time we measure the temperature, we will power on the
266 * temperature sensor, enable measurements, take a reading,
267 * disable measurements, power off the temperature sensor.
269 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
270 soc_data->power_down_mask);
271 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
272 soc_data->measure_temp_mask);
278 * According to the temp sensor designers, it may require up to ~17us
279 * to complete a measurement.
282 usleep_range(20, 50);
284 regmap_read(map, soc_data->temp_data, &val);
286 if (data->mode != THERMAL_DEVICE_ENABLED) {
287 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
288 soc_data->measure_temp_mask);
289 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
290 soc_data->power_down_mask);
293 if ((val & soc_data->temp_valid_mask) == 0) {
294 dev_dbg(&tz->device, "temp measurement never finished\n");
298 n_meas = (val & soc_data->temp_value_mask)
299 >> soc_data->temp_value_shift;
301 /* See imx_init_calib() for formula derivation */
302 if (data->socdata->version == TEMPMON_IMX7D)
303 *temp = (n_meas - data->c1 + 25) * 1000;
305 *temp = data->c2 - n_meas * data->c1;
307 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
308 if (data->socdata->version == TEMPMON_IMX6Q) {
309 if (data->alarm_temp == data->temp_passive &&
310 *temp >= data->temp_passive)
311 imx_set_alarm_temp(data, data->temp_critical);
312 if (data->alarm_temp == data->temp_critical &&
313 *temp < data->temp_passive) {
314 imx_set_alarm_temp(data, data->temp_passive);
315 dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
316 data->alarm_temp / 1000);
320 if (*temp != data->last_temp) {
321 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
322 data->last_temp = *temp;
325 /* Reenable alarm IRQ if temperature below alarm temperature */
326 if (!data->irq_enabled && *temp < data->alarm_temp) {
327 data->irq_enabled = true;
328 enable_irq(data->irq);
334 static int imx_get_mode(struct thermal_zone_device *tz,
335 enum thermal_device_mode *mode)
337 struct imx_thermal_data *data = tz->devdata;
344 static int imx_set_mode(struct thermal_zone_device *tz,
345 enum thermal_device_mode mode)
347 struct imx_thermal_data *data = tz->devdata;
348 struct regmap *map = data->tempmon;
349 const struct thermal_soc_data *soc_data = data->socdata;
351 if (mode == THERMAL_DEVICE_ENABLED) {
352 tz->polling_delay = IMX_POLLING_DELAY;
353 tz->passive_delay = IMX_PASSIVE_DELAY;
355 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
356 soc_data->power_down_mask);
357 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
358 soc_data->measure_temp_mask);
360 if (!data->irq_enabled) {
361 data->irq_enabled = true;
362 enable_irq(data->irq);
365 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
366 soc_data->measure_temp_mask);
367 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
368 soc_data->power_down_mask);
370 tz->polling_delay = 0;
371 tz->passive_delay = 0;
373 if (data->irq_enabled) {
374 disable_irq(data->irq);
375 data->irq_enabled = false;
380 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
385 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
386 enum thermal_trip_type *type)
388 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
389 THERMAL_TRIP_CRITICAL;
393 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
395 struct imx_thermal_data *data = tz->devdata;
397 *temp = data->temp_critical;
401 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
404 struct imx_thermal_data *data = tz->devdata;
406 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
411 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
414 struct imx_thermal_data *data = tz->devdata;
416 /* do not allow changing critical threshold */
417 if (trip == IMX_TRIP_CRITICAL)
420 /* do not allow passive to be set higher than critical */
421 if (temp < 0 || temp > data->temp_critical)
424 data->temp_passive = temp;
426 imx_set_alarm_temp(data, temp);
431 static int imx_bind(struct thermal_zone_device *tz,
432 struct thermal_cooling_device *cdev)
436 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
439 THERMAL_WEIGHT_DEFAULT);
442 "binding zone %s with cdev %s failed:%d\n",
443 tz->type, cdev->type, ret);
450 static int imx_unbind(struct thermal_zone_device *tz,
451 struct thermal_cooling_device *cdev)
455 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
458 "unbinding zone %s with cdev %s failed:%d\n",
459 tz->type, cdev->type, ret);
466 static struct thermal_zone_device_ops imx_tz_ops = {
468 .unbind = imx_unbind,
469 .get_temp = imx_get_temp,
470 .get_mode = imx_get_mode,
471 .set_mode = imx_set_mode,
472 .get_trip_type = imx_get_trip_type,
473 .get_trip_temp = imx_get_trip_temp,
474 .get_crit_temp = imx_get_crit_temp,
475 .set_trip_temp = imx_set_trip_temp,
478 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
480 struct imx_thermal_data *data = platform_get_drvdata(pdev);
484 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
485 dev_err(&pdev->dev, "invalid sensor calibration data\n");
490 * On i.MX7D, we only use the calibration data at 25C to get the temp,
491 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
493 if (data->socdata->version == TEMPMON_IMX7D) {
494 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
499 * The sensor is calibrated at 25 °C (aka T1) and the value measured
500 * (aka N1) at this temperature is provided in bits [31:20] in the
501 * i.MX's OCOTP value ANA1.
502 * To find the actual temperature T, the following formula has to be used
503 * when reading value n from the sensor:
505 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
506 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
507 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
512 * T1' = 28.580661 °C
513 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
514 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
517 n1 = ocotp_ana1 >> 20;
519 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
520 temp64 *= 1000; /* to get result in °mC */
521 do_div(temp64, 15423 * n1 - 4148468);
523 data->c2 = n1 * data->c1 + 28581;
528 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
530 struct imx_thermal_data *data = platform_get_drvdata(pdev);
532 /* The maximum die temp is specified by the Temperature Grade */
533 switch ((ocotp_mem0 >> 6) & 0x3) {
534 case 0: /* Commercial (0 to 95 °C) */
535 data->temp_grade = "Commercial";
536 data->temp_max = 95000;
538 case 1: /* Extended Commercial (-20 °C to 105 °C) */
539 data->temp_grade = "Extended Commercial";
540 data->temp_max = 105000;
542 case 2: /* Industrial (-40 °C to 105 °C) */
543 data->temp_grade = "Industrial";
544 data->temp_max = 105000;
546 case 3: /* Automotive (-40 °C to 125 °C) */
547 data->temp_grade = "Automotive";
548 data->temp_max = 125000;
553 * Set the critical trip point at 5 °C under max
554 * Set the passive trip point at 10 °C under max (changeable via sysfs)
556 data->temp_critical = data->temp_max - (1000 * 5);
557 data->temp_passive = data->temp_max - (1000 * 10);
560 static int imx_init_from_tempmon_data(struct platform_device *pdev)
566 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
570 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
574 ret = regmap_read(map, OCOTP_ANA1, &val);
576 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
579 ret = imx_init_calib(pdev, val);
583 ret = regmap_read(map, OCOTP_MEM0, &val);
585 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
588 imx_init_temp_grade(pdev, val);
593 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
598 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
602 ret = imx_init_calib(pdev, val);
606 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
609 imx_init_temp_grade(pdev, val);
614 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
616 struct imx_thermal_data *data = dev;
618 disable_irq_nosync(irq);
619 data->irq_enabled = false;
621 return IRQ_WAKE_THREAD;
624 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
626 struct imx_thermal_data *data = dev;
628 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
629 data->alarm_temp / 1000);
631 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
636 static const struct of_device_id of_imx_thermal_match[] = {
637 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
638 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
639 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
642 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
644 #ifdef CONFIG_CPU_FREQ
646 * Create cooling device in case no #cooling-cells property is available in
649 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
651 struct device_node *np;
654 data->policy = cpufreq_cpu_get(0);
656 pr_debug("%s: CPUFreq policy not found\n", __func__);
657 return -EPROBE_DEFER;
660 np = of_get_cpu_node(data->policy->cpu, NULL);
662 if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
663 data->cdev = cpufreq_cooling_register(data->policy);
664 if (IS_ERR(data->cdev)) {
665 ret = PTR_ERR(data->cdev);
666 cpufreq_cpu_put(data->policy);
674 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
676 cpufreq_cooling_unregister(data->cdev);
677 cpufreq_cpu_put(data->policy);
682 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
687 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
692 static int imx_thermal_probe(struct platform_device *pdev)
694 struct imx_thermal_data *data;
699 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
703 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
706 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
711 data->socdata = of_device_get_match_data(&pdev->dev);
712 if (!data->socdata) {
713 dev_err(&pdev->dev, "no device match found\n");
717 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
718 if (data->socdata->version == TEMPMON_IMX6SX) {
719 regmap_write(map, IMX6_MISC1 + REG_CLR,
720 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
721 | IMX6_MISC1_IRQ_TEMPPANIC);
723 * reset value of LOW ALARM is incorrect, set it to lowest
724 * value to avoid false trigger of low alarm.
726 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
727 data->socdata->low_alarm_mask);
730 data->irq = platform_get_irq(pdev, 0);
734 platform_set_drvdata(pdev, data);
736 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
737 ret = imx_init_from_nvmem_cells(pdev);
739 if (ret == -EPROBE_DEFER)
742 dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
747 ret = imx_init_from_tempmon_data(pdev);
749 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
754 /* Make sure sensor is in known good state for measurements */
755 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
756 data->socdata->power_down_mask);
757 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
758 data->socdata->measure_temp_mask);
759 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
760 data->socdata->measure_freq_mask);
761 if (data->socdata->version != TEMPMON_IMX7D)
762 regmap_write(map, IMX6_MISC0 + REG_SET,
763 IMX6_MISC0_REFTOP_SELBIASOFF);
764 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
765 data->socdata->power_down_mask);
767 ret = imx_thermal_register_legacy_cooling(data);
769 if (ret == -EPROBE_DEFER)
773 "failed to register cpufreq cooling device: %d\n", ret);
777 data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
778 if (IS_ERR(data->thermal_clk)) {
779 ret = PTR_ERR(data->thermal_clk);
780 if (ret != -EPROBE_DEFER)
782 "failed to get thermal clk: %d\n", ret);
787 * Thermal sensor needs clk on to get correct value, normally
788 * we should enable its clk before taking measurement and disable
789 * clk after measurement is done, but if alarm function is enabled,
790 * hardware will auto measure the temperature periodically, so we
791 * need to keep the clk always on for alarm function.
793 ret = clk_prepare_enable(data->thermal_clk);
795 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
799 data->tz = thermal_zone_device_register("imx_thermal_zone",
801 BIT(IMX_TRIP_PASSIVE), data,
805 if (IS_ERR(data->tz)) {
806 ret = PTR_ERR(data->tz);
808 "failed to register thermal zone device %d\n", ret);
812 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
813 " critical:%dC passive:%dC\n", data->temp_grade,
814 data->temp_max / 1000, data->temp_critical / 1000,
815 data->temp_passive / 1000);
817 /* Enable measurements at ~ 10 Hz */
818 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
819 data->socdata->measure_freq_mask);
820 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
821 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
822 measure_freq << data->socdata->measure_freq_shift);
823 imx_set_alarm_temp(data, data->temp_passive);
825 if (data->socdata->version == TEMPMON_IMX6SX)
826 imx_set_panic_temp(data, data->temp_critical);
828 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
829 data->socdata->power_down_mask);
830 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
831 data->socdata->measure_temp_mask);
833 data->irq_enabled = true;
834 data->mode = THERMAL_DEVICE_ENABLED;
836 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
837 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
838 0, "imx_thermal", data);
840 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
841 goto thermal_zone_unregister;
846 thermal_zone_unregister:
847 thermal_zone_device_unregister(data->tz);
849 clk_disable_unprepare(data->thermal_clk);
851 imx_thermal_unregister_legacy_cooling(data);
856 static int imx_thermal_remove(struct platform_device *pdev)
858 struct imx_thermal_data *data = platform_get_drvdata(pdev);
859 struct regmap *map = data->tempmon;
861 /* Disable measurements */
862 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
863 data->socdata->power_down_mask);
864 if (!IS_ERR(data->thermal_clk))
865 clk_disable_unprepare(data->thermal_clk);
867 thermal_zone_device_unregister(data->tz);
868 imx_thermal_unregister_legacy_cooling(data);
873 static int __maybe_unused imx_thermal_suspend(struct device *dev)
875 struct imx_thermal_data *data = dev_get_drvdata(dev);
876 struct regmap *map = data->tempmon;
879 * Need to disable thermal sensor, otherwise, when thermal core
880 * try to get temperature before thermal sensor resume, a wrong
881 * temperature will be read as the thermal sensor is powered
884 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
885 data->socdata->measure_temp_mask);
886 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
887 data->socdata->power_down_mask);
888 data->mode = THERMAL_DEVICE_DISABLED;
889 clk_disable_unprepare(data->thermal_clk);
894 static int __maybe_unused imx_thermal_resume(struct device *dev)
896 struct imx_thermal_data *data = dev_get_drvdata(dev);
897 struct regmap *map = data->tempmon;
900 ret = clk_prepare_enable(data->thermal_clk);
903 /* Enabled thermal sensor after resume */
904 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
905 data->socdata->power_down_mask);
906 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
907 data->socdata->measure_temp_mask);
908 data->mode = THERMAL_DEVICE_ENABLED;
913 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
914 imx_thermal_suspend, imx_thermal_resume);
916 static struct platform_driver imx_thermal = {
918 .name = "imx_thermal",
919 .pm = &imx_thermal_pm_ops,
920 .of_match_table = of_imx_thermal_match,
922 .probe = imx_thermal_probe,
923 .remove = imx_thermal_remove,
925 module_platform_driver(imx_thermal);
927 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
928 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
929 MODULE_LICENSE("GPL v2");
930 MODULE_ALIAS("platform:imx-thermal");