1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/delay.h>
21#include <linux/err.h>
22#include <linux/irq.h>
23#include <linux/interrupt.h>
24#include <linux/io.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/pm_runtime.h>
28#include <linux/reboot.h>
29#include <linux/slab.h>
30#include <linux/spinlock.h>
31#include <linux/thermal.h>
32
33#define IDLE_INTERVAL 5000
34
35#define COMMON_STR 0x00
36#define COMMON_ENR 0x04
37#define COMMON_INTMSK 0x0c
38
39#define REG_POSNEG 0x20
40#define REG_FILONOFF 0x28
41#define REG_THSCR 0x2c
42#define REG_THSSR 0x30
43#define REG_INTCTRL 0x34
44
45
46#define CPCTL (1 << 12)
47
48
49#define CTEMP 0x3f
50
51struct rcar_thermal_common {
52 void __iomem *base;
53 struct device *dev;
54 struct list_head head;
55 spinlock_t lock;
56};
57
58struct rcar_thermal_priv {
59 void __iomem *base;
60 struct rcar_thermal_common *common;
61 struct thermal_zone_device *zone;
62 struct delayed_work work;
63 struct mutex lock;
64 struct list_head list;
65 int id;
66 int ctemp;
67};
68
69#define rcar_thermal_for_each_priv(pos, common) \
70 list_for_each_entry(pos, &common->head, list)
71
72#define MCELSIUS(temp) ((temp) * 1000)
73#define rcar_zone_to_priv(zone) ((zone)->devdata)
74#define rcar_priv_to_dev(priv) ((priv)->common->dev)
75#define rcar_has_irq_support(priv) ((priv)->common->base)
76#define rcar_id_to_shift(priv) ((priv)->id * 8)
77
78#ifdef DEBUG
79# define rcar_force_update_temp(priv) 1
80#else
81# define rcar_force_update_temp(priv) 0
82#endif
83
84
85
86
87#define rcar_thermal_common_read(c, r) \
88 _rcar_thermal_common_read(c, COMMON_ ##r)
89static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
90 u32 reg)
91{
92 return ioread32(common->base + reg);
93}
94
95#define rcar_thermal_common_write(c, r, d) \
96 _rcar_thermal_common_write(c, COMMON_ ##r, d)
97static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
98 u32 reg, u32 data)
99{
100 iowrite32(data, common->base + reg);
101}
102
103#define rcar_thermal_common_bset(c, r, m, d) \
104 _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
105static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
106 u32 reg, u32 mask, u32 data)
107{
108 u32 val;
109
110 val = ioread32(common->base + reg);
111 val &= ~mask;
112 val |= (data & mask);
113 iowrite32(val, common->base + reg);
114}
115
116#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
117static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
118{
119 return ioread32(priv->base + reg);
120}
121
122#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
123static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
124 u32 reg, u32 data)
125{
126 iowrite32(data, priv->base + reg);
127}
128
129#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
130static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
131 u32 mask, u32 data)
132{
133 u32 val;
134
135 val = ioread32(priv->base + reg);
136 val &= ~mask;
137 val |= (data & mask);
138 iowrite32(val, priv->base + reg);
139}
140
141
142
143
144static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
145{
146 struct device *dev = rcar_priv_to_dev(priv);
147 int i;
148 int ctemp, old, new;
149 int ret = -EINVAL;
150
151 mutex_lock(&priv->lock);
152
153
154
155
156
157 rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
158
159 ctemp = 0;
160 old = ~0;
161 for (i = 0; i < 128; i++) {
162
163
164
165
166
167 udelay(300);
168
169 new = rcar_thermal_read(priv, THSSR) & CTEMP;
170 if (new == old) {
171 ctemp = new;
172 break;
173 }
174 old = new;
175 }
176
177 if (!ctemp) {
178 dev_err(dev, "thermal sensor was broken\n");
179 goto err_out_unlock;
180 }
181
182
183
184
185 if (rcar_has_irq_support(priv)) {
186 rcar_thermal_write(priv, FILONOFF, 0);
187
188
189 rcar_thermal_write(priv, POSNEG, 0x1);
190 rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
191 ((ctemp - 1) << 0)));
192 }
193
194 dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
195
196 priv->ctemp = ctemp;
197 ret = 0;
198err_out_unlock:
199 mutex_unlock(&priv->lock);
200 return ret;
201}
202
203static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
204 unsigned long *temp)
205{
206 struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
207
208 if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
209 rcar_thermal_update_temp(priv);
210
211 mutex_lock(&priv->lock);
212 *temp = MCELSIUS((priv->ctemp * 5) - 65);
213 mutex_unlock(&priv->lock);
214
215 return 0;
216}
217
218static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
219 int trip, enum thermal_trip_type *type)
220{
221 struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
222 struct device *dev = rcar_priv_to_dev(priv);
223
224
225 switch (trip) {
226 case 0:
227 *type = THERMAL_TRIP_CRITICAL;
228 break;
229 default:
230 dev_err(dev, "rcar driver trip error\n");
231 return -EINVAL;
232 }
233
234 return 0;
235}
236
237static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
238 int trip, unsigned long *temp)
239{
240 struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
241 struct device *dev = rcar_priv_to_dev(priv);
242
243
244 switch (trip) {
245 case 0:
246 *temp = MCELSIUS(90);
247 break;
248 default:
249 dev_err(dev, "rcar driver trip error\n");
250 return -EINVAL;
251 }
252
253 return 0;
254}
255
256static int rcar_thermal_notify(struct thermal_zone_device *zone,
257 int trip, enum thermal_trip_type type)
258{
259 struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
260 struct device *dev = rcar_priv_to_dev(priv);
261
262 switch (type) {
263 case THERMAL_TRIP_CRITICAL:
264
265 dev_warn(dev, "Thermal reached to critical temperature\n");
266 break;
267 default:
268 break;
269 }
270
271 return 0;
272}
273
274static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
275 .get_temp = rcar_thermal_get_temp,
276 .get_trip_type = rcar_thermal_get_trip_type,
277 .get_trip_temp = rcar_thermal_get_trip_temp,
278 .notify = rcar_thermal_notify,
279};
280
281
282
283
284#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
285#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
286static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
287{
288 struct rcar_thermal_common *common = priv->common;
289 unsigned long flags;
290 u32 mask = 0x3 << rcar_id_to_shift(priv);
291
292 spin_lock_irqsave(&common->lock, flags);
293
294 rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
295
296 spin_unlock_irqrestore(&common->lock, flags);
297}
298
299static void rcar_thermal_work(struct work_struct *work)
300{
301 struct rcar_thermal_priv *priv;
302
303 priv = container_of(work, struct rcar_thermal_priv, work.work);
304
305 rcar_thermal_update_temp(priv);
306 rcar_thermal_irq_enable(priv);
307 thermal_zone_device_update(priv->zone);
308}
309
310static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
311{
312 struct device *dev = rcar_priv_to_dev(priv);
313
314 status = (status >> rcar_id_to_shift(priv)) & 0x3;
315
316 if (status & 0x3) {
317 dev_dbg(dev, "thermal%d %s%s\n",
318 priv->id,
319 (status & 0x2) ? "Rising " : "",
320 (status & 0x1) ? "Falling" : "");
321 }
322
323 return status;
324}
325
326static irqreturn_t rcar_thermal_irq(int irq, void *data)
327{
328 struct rcar_thermal_common *common = data;
329 struct rcar_thermal_priv *priv;
330 unsigned long flags;
331 u32 status, mask;
332
333 spin_lock_irqsave(&common->lock, flags);
334
335 mask = rcar_thermal_common_read(common, INTMSK);
336 status = rcar_thermal_common_read(common, STR);
337 rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
338
339 spin_unlock_irqrestore(&common->lock, flags);
340
341 status = status & ~mask;
342
343
344
345
346 rcar_thermal_for_each_priv(priv, common) {
347 if (rcar_thermal_had_changed(priv, status)) {
348 rcar_thermal_irq_disable(priv);
349 schedule_delayed_work(&priv->work,
350 msecs_to_jiffies(300));
351 }
352 }
353
354 return IRQ_HANDLED;
355}
356
357
358
359
360static int rcar_thermal_probe(struct platform_device *pdev)
361{
362 struct rcar_thermal_common *common;
363 struct rcar_thermal_priv *priv;
364 struct device *dev = &pdev->dev;
365 struct resource *res, *irq;
366 int mres = 0;
367 int i;
368 int ret = -ENODEV;
369 int idle = IDLE_INTERVAL;
370
371 common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
372 if (!common) {
373 dev_err(dev, "Could not allocate common\n");
374 return -ENOMEM;
375 }
376
377 INIT_LIST_HEAD(&common->head);
378 spin_lock_init(&common->lock);
379 common->dev = dev;
380
381 pm_runtime_enable(dev);
382 pm_runtime_get_sync(dev);
383
384 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
385 if (irq) {
386 int ret;
387
388
389
390
391
392
393 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
394 dev_name(dev), common);
395 if (ret) {
396 dev_err(dev, "irq request failed\n ");
397 return ret;
398 }
399
400
401
402
403 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
404 common->base = devm_ioremap_resource(dev, res);
405 if (IS_ERR(common->base))
406 return PTR_ERR(common->base);
407
408
409 rcar_thermal_common_write(common, ENR, 0x00030303);
410
411 idle = 0;
412 }
413
414 for (i = 0;; i++) {
415 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
416 if (!res)
417 break;
418
419 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
420 if (!priv) {
421 dev_err(dev, "Could not allocate priv\n");
422 ret = -ENOMEM;
423 goto error_unregister;
424 }
425
426 priv->base = devm_ioremap_resource(dev, res);
427 if (IS_ERR(priv->base)) {
428 ret = PTR_ERR(priv->base);
429 goto error_unregister;
430 }
431
432 priv->common = common;
433 priv->id = i;
434 mutex_init(&priv->lock);
435 INIT_LIST_HEAD(&priv->list);
436 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
437 rcar_thermal_update_temp(priv);
438
439 priv->zone = thermal_zone_device_register("rcar_thermal",
440 1, 0, priv,
441 &rcar_thermal_zone_ops, NULL, 0,
442 idle);
443 if (IS_ERR(priv->zone)) {
444 dev_err(dev, "can't register thermal zone\n");
445 ret = PTR_ERR(priv->zone);
446 goto error_unregister;
447 }
448
449 if (rcar_has_irq_support(priv))
450 rcar_thermal_irq_enable(priv);
451
452 list_move_tail(&priv->list, &common->head);
453 }
454
455 platform_set_drvdata(pdev, common);
456
457 dev_info(dev, "%d sensor probed\n", i);
458
459 return 0;
460
461error_unregister:
462 rcar_thermal_for_each_priv(priv, common) {
463 thermal_zone_device_unregister(priv->zone);
464 if (rcar_has_irq_support(priv))
465 rcar_thermal_irq_disable(priv);
466 }
467
468 pm_runtime_put_sync(dev);
469 pm_runtime_disable(dev);
470
471 return ret;
472}
473
474static int rcar_thermal_remove(struct platform_device *pdev)
475{
476 struct rcar_thermal_common *common = platform_get_drvdata(pdev);
477 struct device *dev = &pdev->dev;
478 struct rcar_thermal_priv *priv;
479
480 rcar_thermal_for_each_priv(priv, common) {
481 thermal_zone_device_unregister(priv->zone);
482 if (rcar_has_irq_support(priv))
483 rcar_thermal_irq_disable(priv);
484 }
485
486 pm_runtime_put_sync(dev);
487 pm_runtime_disable(dev);
488
489 return 0;
490}
491
492static const struct of_device_id rcar_thermal_dt_ids[] = {
493 { .compatible = "renesas,rcar-thermal", },
494 {},
495};
496MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
497
498static struct platform_driver rcar_thermal_driver = {
499 .driver = {
500 .name = "rcar_thermal",
501 .of_match_table = rcar_thermal_dt_ids,
502 },
503 .probe = rcar_thermal_probe,
504 .remove = rcar_thermal_remove,
505};
506module_platform_driver(rcar_thermal_driver);
507
508MODULE_LICENSE("GPL");
509MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
510MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
511
