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

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