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Linux/drivers/thermal/rcar_thermal.c

  1 /*
  2  *  R-Car THS/TSC thermal sensor driver
  3  *
  4  * Copyright (C) 2012 Renesas Solutions Corp.
  5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License as published by
  9  *  the Free Software Foundation; version 2 of the License.
 10  *
 11  *  This program is distributed in the hope that it will be useful, but
 12  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14  *  General Public License for more details.
 15  *
 16  *  You should have received a copy of the GNU General Public License along
 17  *  with this program; if not, write to the Free Software Foundation, Inc.,
 18  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 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/of_device.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/pm_runtime.h>
 29 #include <linux/reboot.h>
 30 #include <linux/slab.h>
 31 #include <linux/spinlock.h>
 32 #include <linux/thermal.h>
 33 
 34 #include "thermal_hwmon.h"
 35 
 36 #define IDLE_INTERVAL   5000
 37 
 38 #define COMMON_STR      0x00
 39 #define COMMON_ENR      0x04
 40 #define COMMON_INTMSK   0x0c
 41 
 42 #define REG_POSNEG      0x20
 43 #define REG_FILONOFF    0x28
 44 #define REG_THSCR       0x2c
 45 #define REG_THSSR       0x30
 46 #define REG_INTCTRL     0x34
 47 
 48 /* THSCR */
 49 #define CPCTL   (1 << 12)
 50 
 51 /* THSSR */
 52 #define CTEMP   0x3f
 53 
 54 struct rcar_thermal_common {
 55         void __iomem *base;
 56         struct device *dev;
 57         struct list_head head;
 58         spinlock_t lock;
 59 };
 60 
 61 struct rcar_thermal_priv {
 62         void __iomem *base;
 63         struct rcar_thermal_common *common;
 64         struct thermal_zone_device *zone;
 65         struct delayed_work work;
 66         struct mutex lock;
 67         struct list_head list;
 68         int id;
 69         u32 ctemp;
 70 };
 71 
 72 #define rcar_thermal_for_each_priv(pos, common) \
 73         list_for_each_entry(pos, &common->head, list)
 74 
 75 #define MCELSIUS(temp)                  ((temp) * 1000)
 76 #define rcar_zone_to_priv(zone)         ((zone)->devdata)
 77 #define rcar_priv_to_dev(priv)          ((priv)->common->dev)
 78 #define rcar_has_irq_support(priv)      ((priv)->common->base)
 79 #define rcar_id_to_shift(priv)          ((priv)->id * 8)
 80 #define rcar_of_data(dev)               ((unsigned long)of_device_get_match_data(dev))
 81 #define rcar_use_of_thermal(dev)        (rcar_of_data(dev) == USE_OF_THERMAL)
 82 
 83 #define USE_OF_THERMAL  1
 84 static const struct of_device_id rcar_thermal_dt_ids[] = {
 85         { .compatible = "renesas,rcar-thermal", },
 86         { .compatible = "renesas,rcar-gen2-thermal", .data = (void *)USE_OF_THERMAL },
 87         {},
 88 };
 89 MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
 90 
 91 /*
 92  *              basic functions
 93  */
 94 #define rcar_thermal_common_read(c, r) \
 95         _rcar_thermal_common_read(c, COMMON_ ##r)
 96 static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
 97                                      u32 reg)
 98 {
 99         return ioread32(common->base + reg);
100 }
101 
102 #define rcar_thermal_common_write(c, r, d) \
103         _rcar_thermal_common_write(c, COMMON_ ##r, d)
104 static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
105                                        u32 reg, u32 data)
106 {
107         iowrite32(data, common->base + reg);
108 }
109 
110 #define rcar_thermal_common_bset(c, r, m, d) \
111         _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
112 static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
113                                       u32 reg, u32 mask, u32 data)
114 {
115         u32 val;
116 
117         val = ioread32(common->base + reg);
118         val &= ~mask;
119         val |= (data & mask);
120         iowrite32(val, common->base + reg);
121 }
122 
123 #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
124 static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
125 {
126         return ioread32(priv->base + reg);
127 }
128 
129 #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
130 static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
131                                 u32 reg, u32 data)
132 {
133         iowrite32(data, priv->base + reg);
134 }
135 
136 #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
137 static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
138                                u32 mask, u32 data)
139 {
140         u32 val;
141 
142         val = ioread32(priv->base + reg);
143         val &= ~mask;
144         val |= (data & mask);
145         iowrite32(val, priv->base + reg);
146 }
147 
148 /*
149  *              zone device functions
150  */
151 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
152 {
153         struct device *dev = rcar_priv_to_dev(priv);
154         int i;
155         u32 ctemp, old, new;
156         int ret = -EINVAL;
157 
158         mutex_lock(&priv->lock);
159 
160         /*
161          * TSC decides a value of CPTAP automatically,
162          * and this is the conditions which validate interrupt.
163          */
164         rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
165 
166         ctemp = 0;
167         old = ~0;
168         for (i = 0; i < 128; i++) {
169                 /*
170                  * we need to wait 300us after changing comparator offset
171                  * to get stable temperature.
172                  * see "Usage Notes" on datasheet
173                  */
174                 udelay(300);
175 
176                 new = rcar_thermal_read(priv, THSSR) & CTEMP;
177                 if (new == old) {
178                         ctemp = new;
179                         break;
180                 }
181                 old = new;
182         }
183 
184         if (!ctemp) {
185                 dev_err(dev, "thermal sensor was broken\n");
186                 goto err_out_unlock;
187         }
188 
189         /*
190          * enable IRQ
191          */
192         if (rcar_has_irq_support(priv)) {
193                 rcar_thermal_write(priv, FILONOFF, 0);
194 
195                 /* enable Rising/Falling edge interrupt */
196                 rcar_thermal_write(priv, POSNEG,  0x1);
197                 rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
198                                                    ((ctemp - 1) << 0)));
199         }
200 
201         dev_dbg(dev, "thermal%d  %d -> %d\n", priv->id, priv->ctemp, ctemp);
202 
203         priv->ctemp = ctemp;
204         ret = 0;
205 err_out_unlock:
206         mutex_unlock(&priv->lock);
207         return ret;
208 }
209 
210 static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
211                                          int *temp)
212 {
213         int tmp;
214         int ret;
215 
216         ret = rcar_thermal_update_temp(priv);
217         if (ret < 0)
218                 return ret;
219 
220         mutex_lock(&priv->lock);
221         tmp =  MCELSIUS((priv->ctemp * 5) - 65);
222         mutex_unlock(&priv->lock);
223 
224         if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) {
225                 struct device *dev = rcar_priv_to_dev(priv);
226 
227                 dev_err(dev, "it couldn't measure temperature correctly\n");
228                 return -EIO;
229         }
230 
231         *temp = tmp;
232 
233         return 0;
234 }
235 
236 static int rcar_thermal_of_get_temp(void *data, int *temp)
237 {
238         struct rcar_thermal_priv *priv = data;
239 
240         return rcar_thermal_get_current_temp(priv, temp);
241 }
242 
243 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
244 {
245         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
246 
247         return rcar_thermal_get_current_temp(priv, temp);
248 }
249 
250 static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
251                                       int trip, enum thermal_trip_type *type)
252 {
253         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
254         struct device *dev = rcar_priv_to_dev(priv);
255 
256         /* see rcar_thermal_get_temp() */
257         switch (trip) {
258         case 0: /* +90 <= temp */
259                 *type = THERMAL_TRIP_CRITICAL;
260                 break;
261         default:
262                 dev_err(dev, "rcar driver trip error\n");
263                 return -EINVAL;
264         }
265 
266         return 0;
267 }
268 
269 static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
270                                       int trip, int *temp)
271 {
272         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
273         struct device *dev = rcar_priv_to_dev(priv);
274 
275         /* see rcar_thermal_get_temp() */
276         switch (trip) {
277         case 0: /* +90 <= temp */
278                 *temp = MCELSIUS(90);
279                 break;
280         default:
281                 dev_err(dev, "rcar driver trip error\n");
282                 return -EINVAL;
283         }
284 
285         return 0;
286 }
287 
288 static int rcar_thermal_notify(struct thermal_zone_device *zone,
289                                int trip, enum thermal_trip_type type)
290 {
291         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
292         struct device *dev = rcar_priv_to_dev(priv);
293 
294         switch (type) {
295         case THERMAL_TRIP_CRITICAL:
296                 /* FIXME */
297                 dev_warn(dev, "Thermal reached to critical temperature\n");
298                 break;
299         default:
300                 break;
301         }
302 
303         return 0;
304 }
305 
306 static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
307         .get_temp       = rcar_thermal_of_get_temp,
308 };
309 
310 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
311         .get_temp       = rcar_thermal_get_temp,
312         .get_trip_type  = rcar_thermal_get_trip_type,
313         .get_trip_temp  = rcar_thermal_get_trip_temp,
314         .notify         = rcar_thermal_notify,
315 };
316 
317 /*
318  *              interrupt
319  */
320 #define rcar_thermal_irq_enable(p)      _rcar_thermal_irq_ctrl(p, 1)
321 #define rcar_thermal_irq_disable(p)     _rcar_thermal_irq_ctrl(p, 0)
322 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
323 {
324         struct rcar_thermal_common *common = priv->common;
325         unsigned long flags;
326         u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
327 
328         if (!rcar_has_irq_support(priv))
329                 return;
330 
331         spin_lock_irqsave(&common->lock, flags);
332 
333         rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
334 
335         spin_unlock_irqrestore(&common->lock, flags);
336 }
337 
338 static void rcar_thermal_work(struct work_struct *work)
339 {
340         struct rcar_thermal_priv *priv;
341         int cctemp, nctemp;
342         int ret;
343 
344         priv = container_of(work, struct rcar_thermal_priv, work.work);
345 
346         ret = rcar_thermal_get_current_temp(priv, &cctemp);
347         if (ret < 0)
348                 return;
349 
350         ret = rcar_thermal_update_temp(priv);
351         if (ret < 0)
352                 return;
353 
354         rcar_thermal_irq_enable(priv);
355 
356         ret = rcar_thermal_get_current_temp(priv, &nctemp);
357         if (ret < 0)
358                 return;
359 
360         if (nctemp != cctemp)
361                 thermal_zone_device_update(priv->zone,
362                                            THERMAL_EVENT_UNSPECIFIED);
363 }
364 
365 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
366 {
367         struct device *dev = rcar_priv_to_dev(priv);
368 
369         status = (status >> rcar_id_to_shift(priv)) & 0x3;
370 
371         if (status) {
372                 dev_dbg(dev, "thermal%d %s%s\n",
373                         priv->id,
374                         (status & 0x2) ? "Rising " : "",
375                         (status & 0x1) ? "Falling" : "");
376         }
377 
378         return status;
379 }
380 
381 static irqreturn_t rcar_thermal_irq(int irq, void *data)
382 {
383         struct rcar_thermal_common *common = data;
384         struct rcar_thermal_priv *priv;
385         unsigned long flags;
386         u32 status, mask;
387 
388         spin_lock_irqsave(&common->lock, flags);
389 
390         mask    = rcar_thermal_common_read(common, INTMSK);
391         status  = rcar_thermal_common_read(common, STR);
392         rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
393 
394         spin_unlock_irqrestore(&common->lock, flags);
395 
396         status = status & ~mask;
397 
398         /*
399          * check the status
400          */
401         rcar_thermal_for_each_priv(priv, common) {
402                 if (rcar_thermal_had_changed(priv, status)) {
403                         rcar_thermal_irq_disable(priv);
404                         schedule_delayed_work(&priv->work,
405                                               msecs_to_jiffies(300));
406                 }
407         }
408 
409         return IRQ_HANDLED;
410 }
411 
412 /*
413  *              platform functions
414  */
415 static int rcar_thermal_remove(struct platform_device *pdev)
416 {
417         struct rcar_thermal_common *common = platform_get_drvdata(pdev);
418         struct device *dev = &pdev->dev;
419         struct rcar_thermal_priv *priv;
420 
421         rcar_thermal_for_each_priv(priv, common) {
422                 rcar_thermal_irq_disable(priv);
423                 if (rcar_use_of_thermal(dev))
424                         thermal_remove_hwmon_sysfs(priv->zone);
425                 else
426                         thermal_zone_device_unregister(priv->zone);
427         }
428 
429         pm_runtime_put(dev);
430         pm_runtime_disable(dev);
431 
432         return 0;
433 }
434 
435 static int rcar_thermal_probe(struct platform_device *pdev)
436 {
437         struct rcar_thermal_common *common;
438         struct rcar_thermal_priv *priv;
439         struct device *dev = &pdev->dev;
440         struct resource *res, *irq;
441         int mres = 0;
442         int i;
443         int ret = -ENODEV;
444         int idle = IDLE_INTERVAL;
445         u32 enr_bits = 0;
446 
447         common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
448         if (!common)
449                 return -ENOMEM;
450 
451         platform_set_drvdata(pdev, common);
452 
453         INIT_LIST_HEAD(&common->head);
454         spin_lock_init(&common->lock);
455         common->dev = dev;
456 
457         pm_runtime_enable(dev);
458         pm_runtime_get_sync(dev);
459 
460         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
461         if (irq) {
462                 /*
463                  * platform has IRQ support.
464                  * Then, driver uses common registers
465                  * rcar_has_irq_support() will be enabled
466                  */
467                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
468                 common->base = devm_ioremap_resource(dev, res);
469                 if (IS_ERR(common->base))
470                         return PTR_ERR(common->base);
471 
472                 idle = 0; /* polling delay is not needed */
473         }
474 
475         for (i = 0;; i++) {
476                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
477                 if (!res)
478                         break;
479 
480                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
481                 if (!priv) {
482                         ret = -ENOMEM;
483                         goto error_unregister;
484                 }
485 
486                 priv->base = devm_ioremap_resource(dev, res);
487                 if (IS_ERR(priv->base)) {
488                         ret = PTR_ERR(priv->base);
489                         goto error_unregister;
490                 }
491 
492                 priv->common = common;
493                 priv->id = i;
494                 mutex_init(&priv->lock);
495                 INIT_LIST_HEAD(&priv->list);
496                 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
497                 ret = rcar_thermal_update_temp(priv);
498                 if (ret < 0)
499                         goto error_unregister;
500 
501                 if (rcar_use_of_thermal(dev))
502                         priv->zone = devm_thermal_zone_of_sensor_register(
503                                                 dev, i, priv,
504                                                 &rcar_thermal_zone_of_ops);
505                 else
506                         priv->zone = thermal_zone_device_register(
507                                                 "rcar_thermal",
508                                                 1, 0, priv,
509                                                 &rcar_thermal_zone_ops, NULL, 0,
510                                                 idle);
511                 if (IS_ERR(priv->zone)) {
512                         dev_err(dev, "can't register thermal zone\n");
513                         ret = PTR_ERR(priv->zone);
514                         priv->zone = NULL;
515                         goto error_unregister;
516                 }
517 
518                 if (rcar_use_of_thermal(dev)) {
519                         /*
520                          * thermal_zone doesn't enable hwmon as default,
521                          * but, enable it here to keep compatible
522                          */
523                         priv->zone->tzp->no_hwmon = false;
524                         ret = thermal_add_hwmon_sysfs(priv->zone);
525                         if (ret)
526                                 goto error_unregister;
527                 }
528 
529                 rcar_thermal_irq_enable(priv);
530 
531                 list_move_tail(&priv->list, &common->head);
532 
533                 /* update ENR bits */
534                 enr_bits |= 3 << (i * 8);
535         }
536 
537         /* enable temperature comparation */
538         if (irq) {
539                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
540                                        dev_name(dev), common);
541                 if (ret) {
542                         dev_err(dev, "irq request failed\n ");
543                         goto error_unregister;
544                 }
545 
546                 rcar_thermal_common_write(common, ENR, enr_bits);
547         }
548 
549         dev_info(dev, "%d sensor probed\n", i);
550 
551         return 0;
552 
553 error_unregister:
554         rcar_thermal_remove(pdev);
555 
556         return ret;
557 }
558 
559 static struct platform_driver rcar_thermal_driver = {
560         .driver = {
561                 .name   = "rcar_thermal",
562                 .of_match_table = rcar_thermal_dt_ids,
563         },
564         .probe          = rcar_thermal_probe,
565         .remove         = rcar_thermal_remove,
566 };
567 module_platform_driver(rcar_thermal_driver);
568 
569 MODULE_LICENSE("GPL");
570 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
571 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
572 

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