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
42struct rcar_thermal_common {
43	void __iomem *base;
44	struct device *dev;
45	struct list_head head;
46	spinlock_t lock;
47};
48
49struct 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
58static 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
67static 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
76static 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
89struct 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
108static 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};
135MODULE_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)
142static 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)
150static 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)
158static 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)
170static 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)
176static 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)
183static 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 */
197static 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
246err_out_unlock:
247	mutex_unlock(&priv->lock);
248
249	return ctemp;
250}
251
252static 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
273static 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
280static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
281	.get_temp	= rcar_thermal_get_temp,
282};
283
284static 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)
293static 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
309static 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
325static 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
341static 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 */
374static 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
395static 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
533error_unregister:
534	rcar_thermal_remove(pdev);
535
536	return ret;
537}
538
539#ifdef CONFIG_PM_SLEEP
540static 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
555static 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
574static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
575			 rcar_thermal_resume);
576
577static 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};
586module_platform_driver(rcar_thermal_driver);
587
588MODULE_LICENSE("GPL v2");
589MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
590MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
591