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>");