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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/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 /* THSCR */
 46 #define CPCTL   (1 << 12)
 47 
 48 /* THSSR */
 49 #define CTEMP   0x3f
 50 
 51 struct rcar_thermal_common {
 52         void __iomem *base;
 53         struct device *dev;
 54         struct list_head head;
 55         spinlock_t lock;
 56 };
 57 
 58 struct 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         u32 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  *              basic functions
 86  */
 87 #define rcar_thermal_common_read(c, r) \
 88         _rcar_thermal_common_read(c, COMMON_ ##r)
 89 static 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)
 97 static 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)
105 static 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)
117 static 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)
123 static 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)
130 static 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  *              zone device functions
143  */
144 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
145 {
146         struct device *dev = rcar_priv_to_dev(priv);
147         int i;
148         u32 ctemp, old, new;
149         int ret = -EINVAL;
150 
151         mutex_lock(&priv->lock);
152 
153         /*
154          * TSC decides a value of CPTAP automatically,
155          * and this is the conditions which validate interrupt.
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                  * we need to wait 300us after changing comparator offset
164                  * to get stable temperature.
165                  * see "Usage Notes" on datasheet
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          * enable IRQ
184          */
185         if (rcar_has_irq_support(priv)) {
186                 rcar_thermal_write(priv, FILONOFF, 0);
187 
188                 /* enable Rising/Falling edge interrupt */
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;
198 err_out_unlock:
199         mutex_unlock(&priv->lock);
200         return ret;
201 }
202 
203 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
204 {
205         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
206 
207         if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
208                 rcar_thermal_update_temp(priv);
209 
210         mutex_lock(&priv->lock);
211         *temp =  MCELSIUS((priv->ctemp * 5) - 65);
212         mutex_unlock(&priv->lock);
213 
214         return 0;
215 }
216 
217 static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
218                                       int trip, enum thermal_trip_type *type)
219 {
220         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
221         struct device *dev = rcar_priv_to_dev(priv);
222 
223         /* see rcar_thermal_get_temp() */
224         switch (trip) {
225         case 0: /* +90 <= temp */
226                 *type = THERMAL_TRIP_CRITICAL;
227                 break;
228         default:
229                 dev_err(dev, "rcar driver trip error\n");
230                 return -EINVAL;
231         }
232 
233         return 0;
234 }
235 
236 static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
237                                       int trip, int *temp)
238 {
239         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
240         struct device *dev = rcar_priv_to_dev(priv);
241 
242         /* see rcar_thermal_get_temp() */
243         switch (trip) {
244         case 0: /* +90 <= temp */
245                 *temp = MCELSIUS(90);
246                 break;
247         default:
248                 dev_err(dev, "rcar driver trip error\n");
249                 return -EINVAL;
250         }
251 
252         return 0;
253 }
254 
255 static int rcar_thermal_notify(struct thermal_zone_device *zone,
256                                int trip, enum thermal_trip_type type)
257 {
258         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
259         struct device *dev = rcar_priv_to_dev(priv);
260 
261         switch (type) {
262         case THERMAL_TRIP_CRITICAL:
263                 /* FIXME */
264                 dev_warn(dev, "Thermal reached to critical temperature\n");
265                 break;
266         default:
267                 break;
268         }
269 
270         return 0;
271 }
272 
273 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
274         .get_temp       = rcar_thermal_get_temp,
275         .get_trip_type  = rcar_thermal_get_trip_type,
276         .get_trip_temp  = rcar_thermal_get_trip_temp,
277         .notify         = rcar_thermal_notify,
278 };
279 
280 /*
281  *              interrupt
282  */
283 #define rcar_thermal_irq_enable(p)      _rcar_thermal_irq_ctrl(p, 1)
284 #define rcar_thermal_irq_disable(p)     _rcar_thermal_irq_ctrl(p, 0)
285 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
286 {
287         struct rcar_thermal_common *common = priv->common;
288         unsigned long flags;
289         u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
290 
291         spin_lock_irqsave(&common->lock, flags);
292 
293         rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
294 
295         spin_unlock_irqrestore(&common->lock, flags);
296 }
297 
298 static void rcar_thermal_work(struct work_struct *work)
299 {
300         struct rcar_thermal_priv *priv;
301         int cctemp, nctemp;
302 
303         priv = container_of(work, struct rcar_thermal_priv, work.work);
304 
305         rcar_thermal_get_temp(priv->zone, &cctemp);
306         rcar_thermal_update_temp(priv);
307         rcar_thermal_irq_enable(priv);
308 
309         rcar_thermal_get_temp(priv->zone, &nctemp);
310         if (nctemp != cctemp)
311                 thermal_zone_device_update(priv->zone);
312 }
313 
314 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
315 {
316         struct device *dev = rcar_priv_to_dev(priv);
317 
318         status = (status >> rcar_id_to_shift(priv)) & 0x3;
319 
320         if (status) {
321                 dev_dbg(dev, "thermal%d %s%s\n",
322                         priv->id,
323                         (status & 0x2) ? "Rising " : "",
324                         (status & 0x1) ? "Falling" : "");
325         }
326 
327         return status;
328 }
329 
330 static irqreturn_t rcar_thermal_irq(int irq, void *data)
331 {
332         struct rcar_thermal_common *common = data;
333         struct rcar_thermal_priv *priv;
334         unsigned long flags;
335         u32 status, mask;
336 
337         spin_lock_irqsave(&common->lock, flags);
338 
339         mask    = rcar_thermal_common_read(common, INTMSK);
340         status  = rcar_thermal_common_read(common, STR);
341         rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
342 
343         spin_unlock_irqrestore(&common->lock, flags);
344 
345         status = status & ~mask;
346 
347         /*
348          * check the status
349          */
350         rcar_thermal_for_each_priv(priv, common) {
351                 if (rcar_thermal_had_changed(priv, status)) {
352                         rcar_thermal_irq_disable(priv);
353                         schedule_delayed_work(&priv->work,
354                                               msecs_to_jiffies(300));
355                 }
356         }
357 
358         return IRQ_HANDLED;
359 }
360 
361 /*
362  *              platform functions
363  */
364 static int rcar_thermal_remove(struct platform_device *pdev)
365 {
366         struct rcar_thermal_common *common = platform_get_drvdata(pdev);
367         struct device *dev = &pdev->dev;
368         struct rcar_thermal_priv *priv;
369 
370         rcar_thermal_for_each_priv(priv, common) {
371                 if (rcar_has_irq_support(priv))
372                         rcar_thermal_irq_disable(priv);
373                 thermal_zone_device_unregister(priv->zone);
374         }
375 
376         pm_runtime_put(dev);
377         pm_runtime_disable(dev);
378 
379         return 0;
380 }
381 
382 static int rcar_thermal_probe(struct platform_device *pdev)
383 {
384         struct rcar_thermal_common *common;
385         struct rcar_thermal_priv *priv;
386         struct device *dev = &pdev->dev;
387         struct resource *res, *irq;
388         int mres = 0;
389         int i;
390         int ret = -ENODEV;
391         int idle = IDLE_INTERVAL;
392         u32 enr_bits = 0;
393 
394         common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
395         if (!common)
396                 return -ENOMEM;
397 
398         platform_set_drvdata(pdev, common);
399 
400         INIT_LIST_HEAD(&common->head);
401         spin_lock_init(&common->lock);
402         common->dev = dev;
403 
404         pm_runtime_enable(dev);
405         pm_runtime_get_sync(dev);
406 
407         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
408         if (irq) {
409                 /*
410                  * platform has IRQ support.
411                  * Then, driver uses common registers
412                  * rcar_has_irq_support() will be enabled
413                  */
414                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
415                 common->base = devm_ioremap_resource(dev, res);
416                 if (IS_ERR(common->base))
417                         return PTR_ERR(common->base);
418 
419                 idle = 0; /* polling delay is not needed */
420         }
421 
422         for (i = 0;; i++) {
423                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
424                 if (!res)
425                         break;
426 
427                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
428                 if (!priv) {
429                         ret = -ENOMEM;
430                         goto error_unregister;
431                 }
432 
433                 priv->base = devm_ioremap_resource(dev, res);
434                 if (IS_ERR(priv->base)) {
435                         ret = PTR_ERR(priv->base);
436                         goto error_unregister;
437                 }
438 
439                 priv->common = common;
440                 priv->id = i;
441                 mutex_init(&priv->lock);
442                 INIT_LIST_HEAD(&priv->list);
443                 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
444                 rcar_thermal_update_temp(priv);
445 
446                 priv->zone = thermal_zone_device_register("rcar_thermal",
447                                                 1, 0, priv,
448                                                 &rcar_thermal_zone_ops, NULL, 0,
449                                                 idle);
450                 if (IS_ERR(priv->zone)) {
451                         dev_err(dev, "can't register thermal zone\n");
452                         ret = PTR_ERR(priv->zone);
453                         goto error_unregister;
454                 }
455 
456                 if (rcar_has_irq_support(priv))
457                         rcar_thermal_irq_enable(priv);
458 
459                 list_move_tail(&priv->list, &common->head);
460 
461                 /* update ENR bits */
462                 enr_bits |= 3 << (i * 8);
463         }
464 
465         /* enable temperature comparation */
466         if (irq) {
467                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
468                                        dev_name(dev), common);
469                 if (ret) {
470                         dev_err(dev, "irq request failed\n ");
471                         goto error_unregister;
472                 }
473 
474                 rcar_thermal_common_write(common, ENR, enr_bits);
475         }
476 
477         dev_info(dev, "%d sensor probed\n", i);
478 
479         return 0;
480 
481 error_unregister:
482         rcar_thermal_remove(pdev);
483 
484         return ret;
485 }
486 
487 static const struct of_device_id rcar_thermal_dt_ids[] = {
488         { .compatible = "renesas,rcar-thermal", },
489         {},
490 };
491 MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
492 
493 static struct platform_driver rcar_thermal_driver = {
494         .driver = {
495                 .name   = "rcar_thermal",
496                 .of_match_table = rcar_thermal_dt_ids,
497         },
498         .probe          = rcar_thermal_probe,
499         .remove         = rcar_thermal_remove,
500 };
501 module_platform_driver(rcar_thermal_driver);
502 
503 MODULE_LICENSE("GPL");
504 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
505 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
506 

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