1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  R-Car THS/TSC thermal sensor driver
4  *
5  * Copyright (C) 2012 Renesas Solutions Corp.
6  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7  */
8 #include <linux/delay.h>
9 #include <linux/err.h>
10 #include <linux/irq.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/reboot.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/thermal.h>
21 
22 #include "thermal_hwmon.h"
23 
24 #define IDLE_INTERVAL	5000
25 
26 #define COMMON_STR	0x00
27 #define COMMON_ENR	0x04
28 #define COMMON_INTMSK	0x0c
29 
30 #define REG_POSNEG	0x20
31 #define REG_FILONOFF	0x28
32 #define REG_THSCR	0x2c
33 #define REG_THSSR	0x30
34 #define REG_INTCTRL	0x34
35 
36 /* THSCR */
37 #define CPCTL	(1 << 12)
38 
39 /* THSSR */
40 #define CTEMP	0x3f
41 
42 struct rcar_thermal_common {
43 	void __iomem *base;
44 	struct device *dev;
45 	struct list_head head;
46 	spinlock_t lock;
47 };
48 
49 struct rcar_thermal_chip {
50 	unsigned int use_of_thermal : 1;
51 	unsigned int has_filonoff : 1;
52 	unsigned int irq_per_ch : 1;
53 	unsigned int needs_suspend_resume : 1;
54 	unsigned int nirqs;
55 	unsigned int ctemp_bands;
56 };
57 
58 static const struct rcar_thermal_chip rcar_thermal = {
59 	.use_of_thermal = 0,
60 	.has_filonoff = 1,
61 	.irq_per_ch = 0,
62 	.needs_suspend_resume = 0,
63 	.nirqs = 1,
64 	.ctemp_bands = 1,
65 };
66 
67 static const struct rcar_thermal_chip rcar_gen2_thermal = {
68 	.use_of_thermal = 1,
69 	.has_filonoff = 1,
70 	.irq_per_ch = 0,
71 	.needs_suspend_resume = 0,
72 	.nirqs = 1,
73 	.ctemp_bands = 1,
74 };
75 
76 static const struct rcar_thermal_chip rcar_gen3_thermal = {
77 	.use_of_thermal = 1,
78 	.has_filonoff = 0,
79 	.irq_per_ch = 1,
80 	.needs_suspend_resume = 1,
81 	/*
82 	 * The Gen3 chip has 3 interrupts, but this driver uses only 2
83 	 * interrupts to detect a temperature change, rise or fall.
84 	 */
85 	.nirqs = 2,
86 	.ctemp_bands = 2,
87 };
88 
89 struct rcar_thermal_priv {
90 	void __iomem *base;
91 	struct rcar_thermal_common *common;
92 	struct thermal_zone_device *zone;
93 	const struct rcar_thermal_chip *chip;
94 	struct delayed_work work;
95 	struct mutex lock;
96 	struct list_head list;
97 	int id;
98 };
99 
100 #define rcar_thermal_for_each_priv(pos, common)	\
101 	list_for_each_entry(pos, &common->head, list)
102 
103 #define MCELSIUS(temp)			((temp) * 1000)
104 #define rcar_zone_to_priv(zone)		((zone)->devdata)
105 #define rcar_priv_to_dev(priv)		((priv)->common->dev)
106 #define rcar_has_irq_support(priv)	((priv)->common->base)
107 #define rcar_id_to_shift(priv)		((priv)->id * 8)
108 
109 static const struct of_device_id rcar_thermal_dt_ids[] = {
110 	{
111 		.compatible = "renesas,rcar-thermal",
112 		.data = &rcar_thermal,
113 	},
114 	{
115 		.compatible = "renesas,rcar-gen2-thermal",
116 		 .data = &rcar_gen2_thermal,
117 	},
118 	{
119 		.compatible = "renesas,thermal-r8a774c0",
120 		.data = &rcar_gen3_thermal,
121 	},
122 	{
123 		.compatible = "renesas,thermal-r8a77970",
124 		.data = &rcar_gen3_thermal,
125 	},
126 	{
127 		.compatible = "renesas,thermal-r8a77990",
128 		.data = &rcar_gen3_thermal,
129 	},
130 	{
131 		.compatible = "renesas,thermal-r8a77995",
132 		.data = &rcar_gen3_thermal,
133 	},
134 	{},
135 };
136 MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
137 
138 /*
139  *		basic functions
140  */
141 #define rcar_thermal_common_read(c, r) \
142 	_rcar_thermal_common_read(c, COMMON_ ##r)
143 static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
144 				     u32 reg)
145 {
146 	return ioread32(common->base + reg);
147 }
148 
149 #define rcar_thermal_common_write(c, r, d) \
150 	_rcar_thermal_common_write(c, COMMON_ ##r, d)
151 static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
152 				       u32 reg, u32 data)
153 {
154 	iowrite32(data, common->base + reg);
155 }
156 
157 #define rcar_thermal_common_bset(c, r, m, d) \
158 	_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
159 static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
160 				      u32 reg, u32 mask, u32 data)
161 {
162 	u32 val;
163 
164 	val = ioread32(common->base + reg);
165 	val &= ~mask;
166 	val |= (data & mask);
167 	iowrite32(val, common->base + reg);
168 }
169 
170 #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
171 static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
172 {
173 	return ioread32(priv->base + reg);
174 }
175 
176 #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
177 static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
178 				u32 reg, u32 data)
179 {
180 	iowrite32(data, priv->base + reg);
181 }
182 
183 #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
184 static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
185 			       u32 mask, u32 data)
186 {
187 	u32 val;
188 
189 	val = ioread32(priv->base + reg);
190 	val &= ~mask;
191 	val |= (data & mask);
192 	iowrite32(val, priv->base + reg);
193 }
194 
195 /*
196  *		zone device functions
197  */
198 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
199 {
200 	struct device *dev = rcar_priv_to_dev(priv);
201 	int old, new, ctemp = -EINVAL;
202 	unsigned int i;
203 
204 	mutex_lock(&priv->lock);
205 
206 	/*
207 	 * TSC decides a value of CPTAP automatically,
208 	 * and this is the conditions which validate interrupt.
209 	 */
210 	rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
211 
212 	old = ~0;
213 	for (i = 0; i < 128; i++) {
214 		/*
215 		 * we need to wait 300us after changing comparator offset
216 		 * to get stable temperature.
217 		 * see "Usage Notes" on datasheet
218 		 */
219 		usleep_range(300, 400);
220 
221 		new = rcar_thermal_read(priv, THSSR) & CTEMP;
222 		if (new == old) {
223 			ctemp = new;
224 			break;
225 		}
226 		old = new;
227 	}
228 
229 	if (ctemp < 0) {
230 		dev_err(dev, "thermal sensor was broken\n");
231 		goto err_out_unlock;
232 	}
233 
234 	/*
235 	 * enable IRQ
236 	 */
237 	if (rcar_has_irq_support(priv)) {
238 		if (priv->chip->has_filonoff)
239 			rcar_thermal_write(priv, FILONOFF, 0);
240 
241 		/* enable Rising/Falling edge interrupt */
242 		rcar_thermal_write(priv, POSNEG,  0x1);
243 		rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
244 						   ((ctemp - 1) << 0)));
245 	}
246 
247 err_out_unlock:
248 	mutex_unlock(&priv->lock);
249 
250 	return ctemp;
251 }
252 
253 static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
254 					 int *temp)
255 {
256 	int ctemp;
257 
258 	ctemp = rcar_thermal_update_temp(priv);
259 	if (ctemp < 0)
260 		return ctemp;
261 
262 	/* Guaranteed operating range is -45C to 125C. */
263 
264 	if (priv->chip->ctemp_bands == 1)
265 		*temp = MCELSIUS((ctemp * 5) - 65);
266 	else if (ctemp < 24)
267 		*temp = MCELSIUS(((ctemp * 55) - 720) / 10);
268 	else
269 		*temp = MCELSIUS((ctemp * 5) - 60);
270 
271 	return 0;
272 }
273 
274 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
275 {
276 	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
277 
278 	return rcar_thermal_get_current_temp(priv, temp);
279 }
280 
281 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
282 	.get_temp	= rcar_thermal_get_temp,
283 };
284 
285 static struct thermal_trip trips[] = {
286 	{ .type = THERMAL_TRIP_CRITICAL, .temperature = 90000 }
287 };
288 
289 /*
290  *		interrupt
291  */
292 #define rcar_thermal_irq_enable(p)	_rcar_thermal_irq_ctrl(p, 1)
293 #define rcar_thermal_irq_disable(p)	_rcar_thermal_irq_ctrl(p, 0)
294 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
295 {
296 	struct rcar_thermal_common *common = priv->common;
297 	unsigned long flags;
298 	u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
299 
300 	if (!rcar_has_irq_support(priv))
301 		return;
302 
303 	spin_lock_irqsave(&common->lock, flags);
304 
305 	rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
306 
307 	spin_unlock_irqrestore(&common->lock, flags);
308 }
309 
310 static void rcar_thermal_work(struct work_struct *work)
311 {
312 	struct rcar_thermal_priv *priv;
313 	int ret;
314 
315 	priv = container_of(work, struct rcar_thermal_priv, work.work);
316 
317 	ret = rcar_thermal_update_temp(priv);
318 	if (ret < 0)
319 		return;
320 
321 	rcar_thermal_irq_enable(priv);
322 
323 	thermal_zone_device_update(priv->zone, THERMAL_EVENT_UNSPECIFIED);
324 }
325 
326 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
327 {
328 	struct device *dev = rcar_priv_to_dev(priv);
329 
330 	status = (status >> rcar_id_to_shift(priv)) & 0x3;
331 
332 	if (status) {
333 		dev_dbg(dev, "thermal%d %s%s\n",
334 			priv->id,
335 			(status & 0x2) ? "Rising " : "",
336 			(status & 0x1) ? "Falling" : "");
337 	}
338 
339 	return status;
340 }
341 
342 static irqreturn_t rcar_thermal_irq(int irq, void *data)
343 {
344 	struct rcar_thermal_common *common = data;
345 	struct rcar_thermal_priv *priv;
346 	u32 status, mask;
347 
348 	spin_lock(&common->lock);
349 
350 	mask	= rcar_thermal_common_read(common, INTMSK);
351 	status	= rcar_thermal_common_read(common, STR);
352 	rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
353 
354 	spin_unlock(&common->lock);
355 
356 	status = status & ~mask;
357 
358 	/*
359 	 * check the status
360 	 */
361 	rcar_thermal_for_each_priv(priv, common) {
362 		if (rcar_thermal_had_changed(priv, status)) {
363 			rcar_thermal_irq_disable(priv);
364 			queue_delayed_work(system_freezable_wq, &priv->work,
365 					   msecs_to_jiffies(300));
366 		}
367 	}
368 
369 	return IRQ_HANDLED;
370 }
371 
372 /*
373  *		platform functions
374  */
375 static int rcar_thermal_remove(struct platform_device *pdev)
376 {
377 	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
378 	struct device *dev = &pdev->dev;
379 	struct rcar_thermal_priv *priv;
380 
381 	rcar_thermal_for_each_priv(priv, common) {
382 		rcar_thermal_irq_disable(priv);
383 		cancel_delayed_work_sync(&priv->work);
384 		if (priv->chip->use_of_thermal)
385 			thermal_remove_hwmon_sysfs(priv->zone);
386 		else
387 			thermal_zone_device_unregister(priv->zone);
388 	}
389 
390 	pm_runtime_put(dev);
391 	pm_runtime_disable(dev);
392 
393 	return 0;
394 }
395 
396 static int rcar_thermal_probe(struct platform_device *pdev)
397 {
398 	struct rcar_thermal_common *common;
399 	struct rcar_thermal_priv *priv;
400 	struct device *dev = &pdev->dev;
401 	struct resource *res;
402 	const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
403 	int mres = 0;
404 	int i;
405 	int ret = -ENODEV;
406 	int idle = IDLE_INTERVAL;
407 	u32 enr_bits = 0;
408 
409 	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
410 	if (!common)
411 		return -ENOMEM;
412 
413 	platform_set_drvdata(pdev, common);
414 
415 	INIT_LIST_HEAD(&common->head);
416 	spin_lock_init(&common->lock);
417 	common->dev = dev;
418 
419 	pm_runtime_enable(dev);
420 	pm_runtime_get_sync(dev);
421 
422 	for (i = 0; i < chip->nirqs; i++) {
423 		int irq;
424 
425 		ret = platform_get_irq_optional(pdev, i);
426 		if (ret < 0 && ret != -ENXIO)
427 			goto error_unregister;
428 		if (ret > 0)
429 			irq = ret;
430 		else
431 			break;
432 
433 		if (!common->base) {
434 			/*
435 			 * platform has IRQ support.
436 			 * Then, driver uses common registers
437 			 * rcar_has_irq_support() will be enabled
438 			 */
439 			res = platform_get_resource(pdev, IORESOURCE_MEM,
440 						    mres++);
441 			common->base = devm_ioremap_resource(dev, res);
442 			if (IS_ERR(common->base)) {
443 				ret = PTR_ERR(common->base);
444 				goto error_unregister;
445 			}
446 
447 			idle = 0; /* polling delay is not needed */
448 		}
449 
450 		ret = devm_request_irq(dev, irq, rcar_thermal_irq,
451 				       IRQF_SHARED, dev_name(dev), common);
452 		if (ret) {
453 			dev_err(dev, "irq request failed\n ");
454 			goto error_unregister;
455 		}
456 
457 		/* update ENR bits */
458 		if (chip->irq_per_ch)
459 			enr_bits |= 1 << i;
460 	}
461 
462 	for (i = 0;; i++) {
463 		res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
464 		if (!res)
465 			break;
466 
467 		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
468 		if (!priv) {
469 			ret = -ENOMEM;
470 			goto error_unregister;
471 		}
472 
473 		priv->base = devm_ioremap_resource(dev, res);
474 		if (IS_ERR(priv->base)) {
475 			ret = PTR_ERR(priv->base);
476 			goto error_unregister;
477 		}
478 
479 		priv->common = common;
480 		priv->id = i;
481 		priv->chip = chip;
482 		mutex_init(&priv->lock);
483 		INIT_LIST_HEAD(&priv->list);
484 		INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
485 		ret = rcar_thermal_update_temp(priv);
486 		if (ret < 0)
487 			goto error_unregister;
488 
489 		if (chip->use_of_thermal) {
490 			priv->zone = devm_thermal_of_zone_register(
491 						dev, i, priv,
492 						&rcar_thermal_zone_ops);
493 		} else {
494 			priv->zone = thermal_zone_device_register_with_trips(
495 				"rcar_thermal", trips, ARRAY_SIZE(trips), 0, priv,
496 						&rcar_thermal_zone_ops, NULL, 0,
497 						idle);
498 
499 			ret = thermal_zone_device_enable(priv->zone);
500 			if (ret) {
501 				thermal_zone_device_unregister(priv->zone);
502 				priv->zone = ERR_PTR(ret);
503 			}
504 		}
505 		if (IS_ERR(priv->zone)) {
506 			dev_err(dev, "can't register thermal zone\n");
507 			ret = PTR_ERR(priv->zone);
508 			priv->zone = NULL;
509 			goto error_unregister;
510 		}
511 
512 		if (chip->use_of_thermal) {
513 			/*
514 			 * thermal_zone doesn't enable hwmon as default,
515 			 * but, enable it here to keep compatible
516 			 */
517 			priv->zone->tzp->no_hwmon = false;
518 			ret = thermal_add_hwmon_sysfs(priv->zone);
519 			if (ret)
520 				goto error_unregister;
521 		}
522 
523 		rcar_thermal_irq_enable(priv);
524 
525 		list_move_tail(&priv->list, &common->head);
526 
527 		/* update ENR bits */
528 		if (!chip->irq_per_ch)
529 			enr_bits |= 3 << (i * 8);
530 	}
531 
532 	if (common->base && enr_bits)
533 		rcar_thermal_common_write(common, ENR, enr_bits);
534 
535 	dev_info(dev, "%d sensor probed\n", i);
536 
537 	return 0;
538 
539 error_unregister:
540 	rcar_thermal_remove(pdev);
541 
542 	return ret;
543 }
544 
545 #ifdef CONFIG_PM_SLEEP
546 static int rcar_thermal_suspend(struct device *dev)
547 {
548 	struct rcar_thermal_common *common = dev_get_drvdata(dev);
549 	struct rcar_thermal_priv *priv = list_first_entry(&common->head,
550 							  typeof(*priv), list);
551 
552 	if (priv->chip->needs_suspend_resume) {
553 		rcar_thermal_common_write(common, ENR, 0);
554 		rcar_thermal_irq_disable(priv);
555 		rcar_thermal_bset(priv, THSCR, CPCTL, 0);
556 	}
557 
558 	return 0;
559 }
560 
561 static int rcar_thermal_resume(struct device *dev)
562 {
563 	struct rcar_thermal_common *common = dev_get_drvdata(dev);
564 	struct rcar_thermal_priv *priv = list_first_entry(&common->head,
565 							  typeof(*priv), list);
566 	int ret;
567 
568 	if (priv->chip->needs_suspend_resume) {
569 		ret = rcar_thermal_update_temp(priv);
570 		if (ret < 0)
571 			return ret;
572 		rcar_thermal_irq_enable(priv);
573 		rcar_thermal_common_write(common, ENR, 0x03);
574 	}
575 
576 	return 0;
577 }
578 #endif
579 
580 static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
581 			 rcar_thermal_resume);
582 
583 static struct platform_driver rcar_thermal_driver = {
584 	.driver	= {
585 		.name	= "rcar_thermal",
586 		.pm = &rcar_thermal_pm_ops,
587 		.of_match_table = rcar_thermal_dt_ids,
588 	},
589 	.probe		= rcar_thermal_probe,
590 	.remove		= rcar_thermal_remove,
591 };
592 module_platform_driver(rcar_thermal_driver);
593 
594 MODULE_LICENSE("GPL v2");
595 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
596 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
597