1 // SPDX-License-Identifier: GPL-2.0-only
3 * Marvell EBU Armada SoCs thermal sensor driver
5 * Copyright (C) 2013 Marvell
7 #include <linux/device.h>
10 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/platform_device.h>
15 #include <linux/of_device.h>
16 #include <linux/thermal.h>
17 #include <linux/iopoll.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/regmap.h>
20 #include <linux/interrupt.h>
22 #include "thermal_core.h"
24 /* Thermal Manager Control and Status Register */
25 #define PMU_TDC0_SW_RST_MASK (0x1 << 1)
26 #define PMU_TM_DISABLE_OFFS 0
27 #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
28 #define PMU_TDC0_REF_CAL_CNT_OFFS 11
29 #define PMU_TDC0_REF_CAL_CNT_MASK (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)
30 #define PMU_TDC0_OTF_CAL_MASK (0x1 << 30)
31 #define PMU_TDC0_START_CAL_MASK (0x1 << 25)
33 #define A375_UNIT_CONTROL_SHIFT 27
34 #define A375_UNIT_CONTROL_MASK 0x7
35 #define A375_READOUT_INVERT BIT(15)
36 #define A375_HW_RESETn BIT(8)
39 #define CONTROL0_TSEN_TC_TRIM_MASK 0x7
40 #define CONTROL0_TSEN_TC_TRIM_VAL 0x3
42 #define CONTROL0_TSEN_START BIT(0)
43 #define CONTROL0_TSEN_RESET BIT(1)
44 #define CONTROL0_TSEN_ENABLE BIT(2)
45 #define CONTROL0_TSEN_AVG_BYPASS BIT(6)
46 #define CONTROL0_TSEN_CHAN_SHIFT 13
47 #define CONTROL0_TSEN_CHAN_MASK 0xF
48 #define CONTROL0_TSEN_OSR_SHIFT 24
49 #define CONTROL0_TSEN_OSR_MAX 0x3
50 #define CONTROL0_TSEN_MODE_SHIFT 30
51 #define CONTROL0_TSEN_MODE_EXTERNAL 0x2
52 #define CONTROL0_TSEN_MODE_MASK 0x3
54 #define CONTROL1_TSEN_AVG_MASK 0x7
55 #define CONTROL1_EXT_TSEN_SW_RESET BIT(7)
56 #define CONTROL1_EXT_TSEN_HW_RESETn BIT(8)
57 #define CONTROL1_TSEN_INT_EN BIT(25)
58 #define CONTROL1_TSEN_SELECT_OFF 21
59 #define CONTROL1_TSEN_SELECT_MASK 0x3
61 #define STATUS_POLL_PERIOD_US 1000
62 #define STATUS_POLL_TIMEOUT_US 100000
63 #define OVERHEAT_INT_POLL_DELAY_MS 1000
65 struct armada_thermal_data;
67 /* Marvell EBU Thermal Sensor Dev Structure */
68 struct armada_thermal_priv {
70 struct regmap *syscon;
71 char zone_name[THERMAL_NAME_LENGTH];
72 /* serialize temperature reads/updates */
73 struct mutex update_lock;
74 struct armada_thermal_data *data;
75 struct thermal_zone_device *overheat_sensor;
78 long current_threshold;
79 long current_hysteresis;
82 struct armada_thermal_data {
83 /* Initialize the thermal IC */
84 void (*init)(struct platform_device *pdev,
85 struct armada_thermal_priv *priv);
87 /* Formula coeficients: temp = (b - m * reg) / div */
94 /* Register shift and mask to access the sensor temperature */
95 unsigned int temp_shift;
96 unsigned int temp_mask;
97 unsigned int thresh_shift;
98 unsigned int hyst_shift;
99 unsigned int hyst_mask;
103 unsigned int syscon_control0_off;
104 unsigned int syscon_control1_off;
105 unsigned int syscon_status_off;
106 unsigned int dfx_irq_cause_off;
107 unsigned int dfx_irq_mask_off;
108 unsigned int dfx_overheat_irq;
109 unsigned int dfx_server_irq_mask_off;
110 unsigned int dfx_server_irq_en;
112 /* One sensor is in the thermal IC, the others are in the CPUs if any */
116 struct armada_drvdata {
122 struct armada_thermal_priv *priv;
123 struct thermal_zone_device *tz;
128 * struct armada_thermal_sensor - hold the information of one thermal sensor
129 * @thermal: pointer to the local private structure
130 * @tzd: pointer to the thermal zone device
131 * @id: identifier of the thermal sensor
133 struct armada_thermal_sensor {
134 struct armada_thermal_priv *priv;
138 static void armadaxp_init(struct platform_device *pdev,
139 struct armada_thermal_priv *priv)
141 struct armada_thermal_data *data = priv->data;
144 regmap_read(priv->syscon, data->syscon_control1_off, ®);
145 reg |= PMU_TDC0_OTF_CAL_MASK;
147 /* Reference calibration value */
148 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
149 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
151 /* Reset the sensor */
152 reg |= PMU_TDC0_SW_RST_MASK;
154 regmap_write(priv->syscon, data->syscon_control1_off, reg);
156 reg &= ~PMU_TDC0_SW_RST_MASK;
157 regmap_write(priv->syscon, data->syscon_control1_off, reg);
159 /* Enable the sensor */
160 regmap_read(priv->syscon, data->syscon_status_off, ®);
161 reg &= ~PMU_TM_DISABLE_MASK;
162 regmap_write(priv->syscon, data->syscon_status_off, reg);
165 static void armada370_init(struct platform_device *pdev,
166 struct armada_thermal_priv *priv)
168 struct armada_thermal_data *data = priv->data;
171 regmap_read(priv->syscon, data->syscon_control1_off, ®);
172 reg |= PMU_TDC0_OTF_CAL_MASK;
174 /* Reference calibration value */
175 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
176 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
178 /* Reset the sensor */
179 reg &= ~PMU_TDC0_START_CAL_MASK;
181 regmap_write(priv->syscon, data->syscon_control1_off, reg);
186 static void armada375_init(struct platform_device *pdev,
187 struct armada_thermal_priv *priv)
189 struct armada_thermal_data *data = priv->data;
192 regmap_read(priv->syscon, data->syscon_control1_off, ®);
193 reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
194 reg &= ~A375_READOUT_INVERT;
195 reg &= ~A375_HW_RESETn;
196 regmap_write(priv->syscon, data->syscon_control1_off, reg);
200 reg |= A375_HW_RESETn;
201 regmap_write(priv->syscon, data->syscon_control1_off, reg);
206 static int armada_wait_sensor_validity(struct armada_thermal_priv *priv)
210 return regmap_read_poll_timeout(priv->syscon,
211 priv->data->syscon_status_off, reg,
212 reg & priv->data->is_valid_bit,
213 STATUS_POLL_PERIOD_US,
214 STATUS_POLL_TIMEOUT_US);
217 static void armada380_init(struct platform_device *pdev,
218 struct armada_thermal_priv *priv)
220 struct armada_thermal_data *data = priv->data;
223 /* Disable the HW/SW reset */
224 regmap_read(priv->syscon, data->syscon_control1_off, ®);
225 reg |= CONTROL1_EXT_TSEN_HW_RESETn;
226 reg &= ~CONTROL1_EXT_TSEN_SW_RESET;
227 regmap_write(priv->syscon, data->syscon_control1_off, reg);
229 /* Set Tsen Tc Trim to correct default value (errata #132698) */
230 regmap_read(priv->syscon, data->syscon_control0_off, ®);
231 reg &= ~CONTROL0_TSEN_TC_TRIM_MASK;
232 reg |= CONTROL0_TSEN_TC_TRIM_VAL;
233 regmap_write(priv->syscon, data->syscon_control0_off, reg);
236 static void armada_ap806_init(struct platform_device *pdev,
237 struct armada_thermal_priv *priv)
239 struct armada_thermal_data *data = priv->data;
242 regmap_read(priv->syscon, data->syscon_control0_off, ®);
243 reg &= ~CONTROL0_TSEN_RESET;
244 reg |= CONTROL0_TSEN_START | CONTROL0_TSEN_ENABLE;
246 /* Sample every ~2ms */
247 reg |= CONTROL0_TSEN_OSR_MAX << CONTROL0_TSEN_OSR_SHIFT;
249 /* Enable average (2 samples by default) */
250 reg &= ~CONTROL0_TSEN_AVG_BYPASS;
252 regmap_write(priv->syscon, data->syscon_control0_off, reg);
255 static void armada_cp110_init(struct platform_device *pdev,
256 struct armada_thermal_priv *priv)
258 struct armada_thermal_data *data = priv->data;
261 armada380_init(pdev, priv);
263 /* Sample every ~2ms */
264 regmap_read(priv->syscon, data->syscon_control0_off, ®);
265 reg |= CONTROL0_TSEN_OSR_MAX << CONTROL0_TSEN_OSR_SHIFT;
266 regmap_write(priv->syscon, data->syscon_control0_off, reg);
268 /* Average the output value over 2^1 = 2 samples */
269 regmap_read(priv->syscon, data->syscon_control1_off, ®);
270 reg &= ~CONTROL1_TSEN_AVG_MASK;
272 regmap_write(priv->syscon, data->syscon_control1_off, reg);
275 static bool armada_is_valid(struct armada_thermal_priv *priv)
279 if (!priv->data->is_valid_bit)
282 regmap_read(priv->syscon, priv->data->syscon_status_off, ®);
284 return reg & priv->data->is_valid_bit;
287 static void armada_enable_overheat_interrupt(struct armada_thermal_priv *priv)
289 struct armada_thermal_data *data = priv->data;
292 /* Clear DFX temperature IRQ cause */
293 regmap_read(priv->syscon, data->dfx_irq_cause_off, ®);
295 /* Enable DFX Temperature IRQ */
296 regmap_read(priv->syscon, data->dfx_irq_mask_off, ®);
297 reg |= data->dfx_overheat_irq;
298 regmap_write(priv->syscon, data->dfx_irq_mask_off, reg);
300 /* Enable DFX server IRQ */
301 regmap_read(priv->syscon, data->dfx_server_irq_mask_off, ®);
302 reg |= data->dfx_server_irq_en;
303 regmap_write(priv->syscon, data->dfx_server_irq_mask_off, reg);
305 /* Enable overheat interrupt */
306 regmap_read(priv->syscon, data->syscon_control1_off, ®);
307 reg |= CONTROL1_TSEN_INT_EN;
308 regmap_write(priv->syscon, data->syscon_control1_off, reg);
311 static void __maybe_unused
312 armada_disable_overheat_interrupt(struct armada_thermal_priv *priv)
314 struct armada_thermal_data *data = priv->data;
317 regmap_read(priv->syscon, data->syscon_control1_off, ®);
318 reg &= ~CONTROL1_TSEN_INT_EN;
319 regmap_write(priv->syscon, data->syscon_control1_off, reg);
322 /* There is currently no board with more than one sensor per channel */
323 static int armada_select_channel(struct armada_thermal_priv *priv, int channel)
325 struct armada_thermal_data *data = priv->data;
328 if (channel < 0 || channel > priv->data->cpu_nr)
331 if (priv->current_channel == channel)
334 /* Stop the measurements */
335 regmap_read(priv->syscon, data->syscon_control0_off, &ctrl0);
336 ctrl0 &= ~CONTROL0_TSEN_START;
337 regmap_write(priv->syscon, data->syscon_control0_off, ctrl0);
339 /* Reset the mode, internal sensor will be automatically selected */
340 ctrl0 &= ~(CONTROL0_TSEN_MODE_MASK << CONTROL0_TSEN_MODE_SHIFT);
342 /* Other channels are external and should be selected accordingly */
344 /* Change the mode to external */
345 ctrl0 |= CONTROL0_TSEN_MODE_EXTERNAL <<
346 CONTROL0_TSEN_MODE_SHIFT;
347 /* Select the sensor */
348 ctrl0 &= ~(CONTROL0_TSEN_CHAN_MASK << CONTROL0_TSEN_CHAN_SHIFT);
349 ctrl0 |= (channel - 1) << CONTROL0_TSEN_CHAN_SHIFT;
352 /* Actually set the mode/channel */
353 regmap_write(priv->syscon, data->syscon_control0_off, ctrl0);
354 priv->current_channel = channel;
356 /* Re-start the measurements */
357 ctrl0 |= CONTROL0_TSEN_START;
358 regmap_write(priv->syscon, data->syscon_control0_off, ctrl0);
361 * The IP has a latency of ~15ms, so after updating the selected source,
362 * we must absolutely wait for the sensor validity bit to ensure we read
365 if (armada_wait_sensor_validity(priv)) {
367 "Temperature sensor reading not valid\n");
374 static int armada_read_sensor(struct armada_thermal_priv *priv, int *temp)
379 regmap_read(priv->syscon, priv->data->syscon_status_off, ®);
380 reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
381 if (priv->data->signed_sample)
382 /* The most significant bit is the sign bit */
383 sample = sign_extend32(reg, fls(priv->data->temp_mask) - 1);
387 /* Get formula coeficients */
388 b = priv->data->coef_b;
389 m = priv->data->coef_m;
390 div = priv->data->coef_div;
392 if (priv->data->inverted)
393 *temp = div_s64((m * sample) - b, div);
395 *temp = div_s64(b - (m * sample), div);
400 static int armada_get_temp_legacy(struct thermal_zone_device *thermal,
403 struct armada_thermal_priv *priv = thermal->devdata;
407 if (!armada_is_valid(priv)) {
409 "Temperature sensor reading not valid\n");
413 /* Do the actual reading */
414 ret = armada_read_sensor(priv, temp);
419 static struct thermal_zone_device_ops legacy_ops = {
420 .get_temp = armada_get_temp_legacy,
423 static int armada_get_temp(void *_sensor, int *temp)
425 struct armada_thermal_sensor *sensor = _sensor;
426 struct armada_thermal_priv *priv = sensor->priv;
429 mutex_lock(&priv->update_lock);
431 /* Select the desired channel */
432 ret = armada_select_channel(priv, sensor->id);
436 /* Do the actual reading */
437 ret = armada_read_sensor(priv, temp);
442 * Select back the interrupt source channel from which a potential
443 * critical trip point has been set.
445 ret = armada_select_channel(priv, priv->interrupt_source);
448 mutex_unlock(&priv->update_lock);
453 static const struct thermal_zone_of_device_ops of_ops = {
454 .get_temp = armada_get_temp,
457 static unsigned int armada_mc_to_reg_temp(struct armada_thermal_data *data,
458 unsigned int temp_mc)
460 s64 b = data->coef_b;
461 s64 m = data->coef_m;
462 s64 div = data->coef_div;
466 sample = div_s64(((temp_mc * div) + b), m);
468 sample = div_s64((b - (temp_mc * div)), m);
470 return sample & data->temp_mask;
474 * The documentation states:
475 * high/low watermark = threshold +/- 0.4761 * 2^(hysteresis + 2)
476 * which is the mathematical derivation for:
477 * 0x0 <=> 1.9°C, 0x1 <=> 3.8°C, 0x2 <=> 7.6°C, 0x3 <=> 15.2°C
479 static unsigned int hyst_levels_mc[] = {1900, 3800, 7600, 15200};
481 static unsigned int armada_mc_to_reg_hyst(struct armada_thermal_data *data,
482 unsigned int hyst_mc)
487 * We will always take the smallest possible hysteresis to avoid risking
488 * the hardware integrity by enlarging the threshold by +8°C in the
491 for (i = ARRAY_SIZE(hyst_levels_mc) - 1; i > 0; i--)
492 if (hyst_mc >= hyst_levels_mc[i])
495 return i & data->hyst_mask;
498 static void armada_set_overheat_thresholds(struct armada_thermal_priv *priv,
499 int thresh_mc, int hyst_mc)
501 struct armada_thermal_data *data = priv->data;
502 unsigned int threshold = armada_mc_to_reg_temp(data, thresh_mc);
503 unsigned int hysteresis = armada_mc_to_reg_hyst(data, hyst_mc);
506 regmap_read(priv->syscon, data->syscon_control1_off, &ctrl1);
509 if (thresh_mc >= 0) {
510 ctrl1 &= ~(data->temp_mask << data->thresh_shift);
511 ctrl1 |= threshold << data->thresh_shift;
512 priv->current_threshold = thresh_mc;
517 ctrl1 &= ~(data->hyst_mask << data->hyst_shift);
518 ctrl1 |= hysteresis << data->hyst_shift;
519 priv->current_hysteresis = hyst_mc;
522 regmap_write(priv->syscon, data->syscon_control1_off, ctrl1);
525 static irqreturn_t armada_overheat_isr(int irq, void *blob)
528 * Disable the IRQ and continue in thread context (thermal core
529 * notification and temperature monitoring).
531 disable_irq_nosync(irq);
533 return IRQ_WAKE_THREAD;
536 static irqreturn_t armada_overheat_isr_thread(int irq, void *blob)
538 struct armada_thermal_priv *priv = blob;
539 int low_threshold = priv->current_threshold - priv->current_hysteresis;
544 /* Notify the core in thread context */
545 thermal_zone_device_update(priv->overheat_sensor,
546 THERMAL_EVENT_UNSPECIFIED);
549 * The overheat interrupt must be cleared by reading the DFX interrupt
550 * cause _after_ the temperature has fallen down to the low threshold.
551 * Otherwise future interrupts might not be served.
554 msleep(OVERHEAT_INT_POLL_DELAY_MS);
555 mutex_lock(&priv->update_lock);
556 ret = armada_read_sensor(priv, &temperature);
557 mutex_unlock(&priv->update_lock);
560 } while (temperature >= low_threshold);
562 regmap_read(priv->syscon, priv->data->dfx_irq_cause_off, &dummy);
564 /* Notify the thermal core that the temperature is acceptable again */
565 thermal_zone_device_update(priv->overheat_sensor,
566 THERMAL_EVENT_UNSPECIFIED);
574 static const struct armada_thermal_data armadaxp_data = {
575 .init = armadaxp_init,
578 .coef_b = 3153000000ULL,
579 .coef_m = 10000000ULL,
581 .syscon_status_off = 0xb0,
582 .syscon_control1_off = 0x2d0,
585 static const struct armada_thermal_data armada370_data = {
586 .init = armada370_init,
587 .is_valid_bit = BIT(9),
590 .coef_b = 3153000000ULL,
591 .coef_m = 10000000ULL,
593 .syscon_status_off = 0x0,
594 .syscon_control1_off = 0x4,
597 static const struct armada_thermal_data armada375_data = {
598 .init = armada375_init,
599 .is_valid_bit = BIT(10),
602 .coef_b = 3171900000ULL,
603 .coef_m = 10000000ULL,
605 .syscon_status_off = 0x78,
606 .syscon_control0_off = 0x7c,
607 .syscon_control1_off = 0x80,
610 static const struct armada_thermal_data armada380_data = {
611 .init = armada380_init,
612 .is_valid_bit = BIT(10),
615 .coef_b = 1172499100ULL,
616 .coef_m = 2000096ULL,
619 .syscon_control0_off = 0x70,
620 .syscon_control1_off = 0x74,
621 .syscon_status_off = 0x78,
624 static const struct armada_thermal_data armada_ap806_data = {
625 .init = armada_ap806_init,
626 .is_valid_bit = BIT(16),
636 .signed_sample = true,
637 .syscon_control0_off = 0x84,
638 .syscon_control1_off = 0x88,
639 .syscon_status_off = 0x8C,
640 .dfx_irq_cause_off = 0x108,
641 .dfx_irq_mask_off = 0x10C,
642 .dfx_overheat_irq = BIT(22),
643 .dfx_server_irq_mask_off = 0x104,
644 .dfx_server_irq_en = BIT(1),
648 static const struct armada_thermal_data armada_cp110_data = {
649 .init = armada_cp110_init,
650 .is_valid_bit = BIT(10),
656 .coef_b = 1172499100ULL,
657 .coef_m = 2000096ULL,
660 .syscon_control0_off = 0x70,
661 .syscon_control1_off = 0x74,
662 .syscon_status_off = 0x78,
663 .dfx_irq_cause_off = 0x108,
664 .dfx_irq_mask_off = 0x10C,
665 .dfx_overheat_irq = BIT(20),
666 .dfx_server_irq_mask_off = 0x104,
667 .dfx_server_irq_en = BIT(1),
670 static const struct of_device_id armada_thermal_id_table[] = {
672 .compatible = "marvell,armadaxp-thermal",
673 .data = &armadaxp_data,
676 .compatible = "marvell,armada370-thermal",
677 .data = &armada370_data,
680 .compatible = "marvell,armada375-thermal",
681 .data = &armada375_data,
684 .compatible = "marvell,armada380-thermal",
685 .data = &armada380_data,
688 .compatible = "marvell,armada-ap806-thermal",
689 .data = &armada_ap806_data,
692 .compatible = "marvell,armada-cp110-thermal",
693 .data = &armada_cp110_data,
699 MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
701 static const struct regmap_config armada_thermal_regmap_config = {
708 static int armada_thermal_probe_legacy(struct platform_device *pdev,
709 struct armada_thermal_priv *priv)
711 struct armada_thermal_data *data = priv->data;
712 struct resource *res;
715 /* First memory region points towards the status register */
716 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
717 base = devm_ioremap_resource(&pdev->dev, res);
719 return PTR_ERR(base);
722 * Fix up from the old individual DT register specification to
723 * cover all the registers. We do this by adjusting the ioremap()
724 * result, which should be fine as ioremap() deals with pages.
725 * However, validate that we do not cross a page boundary while
726 * making this adjustment.
728 if (((unsigned long)base & ~PAGE_MASK) < data->syscon_status_off)
730 base -= data->syscon_status_off;
732 priv->syscon = devm_regmap_init_mmio(&pdev->dev, base,
733 &armada_thermal_regmap_config);
734 return PTR_ERR_OR_ZERO(priv->syscon);
737 static int armada_thermal_probe_syscon(struct platform_device *pdev,
738 struct armada_thermal_priv *priv)
740 priv->syscon = syscon_node_to_regmap(pdev->dev.parent->of_node);
741 return PTR_ERR_OR_ZERO(priv->syscon);
744 static void armada_set_sane_name(struct platform_device *pdev,
745 struct armada_thermal_priv *priv)
747 const char *name = dev_name(&pdev->dev);
750 if (strlen(name) > THERMAL_NAME_LENGTH) {
752 * When inside a system controller, the device name has the
753 * form: f06f8000.system-controller:ap-thermal so stripping
754 * after the ':' should give us a shorter but meaningful name.
756 name = strrchr(name, ':');
758 name = "armada_thermal";
763 /* Save the name locally */
764 strncpy(priv->zone_name, name, THERMAL_NAME_LENGTH - 1);
765 priv->zone_name[THERMAL_NAME_LENGTH - 1] = '\0';
767 /* Then check there are no '-' or hwmon core will complain */
769 insane_char = strpbrk(priv->zone_name, "-");
772 } while (insane_char);
776 * The IP can manage to trigger interrupts on overheat situation from all the
777 * sensors. However, the interrupt source changes along with the last selected
778 * source (ie. the last read sensor), which is an inconsistent behavior. Avoid
779 * possible glitches by always selecting back only one channel (arbitrarily: the
780 * first in the DT which has a critical trip point). We also disable sensor
781 * switch during overheat situations.
783 static int armada_configure_overheat_int(struct armada_thermal_priv *priv,
784 struct thermal_zone_device *tz,
787 /* Retrieve the critical trip point to enable the overheat interrupt */
788 const struct thermal_trip *trips = of_thermal_get_trip_points(tz);
795 for (i = 0; i < of_thermal_get_ntrips(tz); i++)
796 if (trips[i].type == THERMAL_TRIP_CRITICAL)
799 if (i == of_thermal_get_ntrips(tz))
802 ret = armada_select_channel(priv, sensor_id);
806 armada_set_overheat_thresholds(priv,
807 trips[i].temperature,
808 trips[i].hysteresis);
809 priv->overheat_sensor = tz;
810 priv->interrupt_source = sensor_id;
812 armada_enable_overheat_interrupt(priv);
817 static int armada_thermal_probe(struct platform_device *pdev)
819 struct thermal_zone_device *tz;
820 struct armada_thermal_sensor *sensor;
821 struct armada_drvdata *drvdata;
822 const struct of_device_id *match;
823 struct armada_thermal_priv *priv;
827 match = of_match_device(armada_thermal_id_table, &pdev->dev);
831 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
835 drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
839 priv->dev = &pdev->dev;
840 priv->data = (struct armada_thermal_data *)match->data;
842 mutex_init(&priv->update_lock);
845 * Legacy DT bindings only described "control1" register (also referred
846 * as "control MSB" on old documentation). Then, bindings moved to cover
847 * "control0/control LSB" and "control1/control MSB" registers within
848 * the same resource, which was then of size 8 instead of 4.
850 * The logic of defining sporadic registers is broken. For instance, it
851 * blocked the addition of the overheat interrupt feature that needed
852 * another resource somewhere else in the same memory area. One solution
853 * is to define an overall system controller and put the thermal node
854 * into it, which requires the use of regmaps across all the driver.
856 if (IS_ERR(syscon_node_to_regmap(pdev->dev.parent->of_node))) {
857 /* Ensure device name is correct for the thermal core */
858 armada_set_sane_name(pdev, priv);
860 ret = armada_thermal_probe_legacy(pdev, priv);
864 priv->data->init(pdev, priv);
866 /* Wait the sensors to be valid */
867 armada_wait_sensor_validity(priv);
869 tz = thermal_zone_device_register(priv->zone_name, 0, 0, priv,
870 &legacy_ops, NULL, 0, 0);
873 "Failed to register thermal zone device\n");
877 ret = thermal_zone_device_enable(tz);
879 thermal_zone_device_unregister(tz);
883 drvdata->type = LEGACY;
884 drvdata->data.tz = tz;
885 platform_set_drvdata(pdev, drvdata);
890 ret = armada_thermal_probe_syscon(pdev, priv);
894 priv->current_channel = -1;
895 priv->data->init(pdev, priv);
896 drvdata->type = SYSCON;
897 drvdata->data.priv = priv;
898 platform_set_drvdata(pdev, drvdata);
900 irq = platform_get_irq(pdev, 0);
901 if (irq == -EPROBE_DEFER)
904 /* The overheat interrupt feature is not mandatory */
906 ret = devm_request_threaded_irq(&pdev->dev, irq,
908 armada_overheat_isr_thread,
911 dev_err(&pdev->dev, "Cannot request threaded IRQ %d\n",
918 * There is one channel for the IC and one per CPU (if any), each
919 * channel has one sensor.
921 for (sensor_id = 0; sensor_id <= priv->data->cpu_nr; sensor_id++) {
922 sensor = devm_kzalloc(&pdev->dev,
923 sizeof(struct armada_thermal_sensor),
928 /* Register the sensor */
930 sensor->id = sensor_id;
931 tz = devm_thermal_zone_of_sensor_register(&pdev->dev,
935 dev_info(&pdev->dev, "Thermal sensor %d unavailable\n",
937 devm_kfree(&pdev->dev, sensor);
942 * The first channel that has a critical trip point registered
943 * in the DT will serve as interrupt source. Others possible
944 * critical trip points will simply be ignored by the driver.
946 if (irq > 0 && !priv->overheat_sensor)
947 armada_configure_overheat_int(priv, tz, sensor->id);
950 /* Just complain if no overheat interrupt was set up */
951 if (!priv->overheat_sensor)
952 dev_warn(&pdev->dev, "Overheat interrupt not available\n");
957 static int armada_thermal_exit(struct platform_device *pdev)
959 struct armada_drvdata *drvdata = platform_get_drvdata(pdev);
961 if (drvdata->type == LEGACY)
962 thermal_zone_device_unregister(drvdata->data.tz);
967 static struct platform_driver armada_thermal_driver = {
968 .probe = armada_thermal_probe,
969 .remove = armada_thermal_exit,
971 .name = "armada_thermal",
972 .of_match_table = armada_thermal_id_table,
976 module_platform_driver(armada_thermal_driver);
978 MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
979 MODULE_DESCRIPTION("Marvell EBU Armada SoCs thermal driver");
980 MODULE_LICENSE("GPL v2");