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