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_chip {
  62         unsigned int use_of_thermal : 1;
  63         unsigned int has_filonoff : 1;
  64         unsigned int irq_per_ch : 1;
  65         unsigned int needs_suspend_resume : 1;
  66         unsigned int nirqs;
  67 };
  68
  69 static const struct rcar_thermal_chip rcar_thermal = {
  70         .use_of_thermal = 0,
  71         .has_filonoff = 1,
  72         .irq_per_ch = 0,
  73         .needs_suspend_resume = 0,
  74         .nirqs = 1,
  75 };
  76
  77 static const struct rcar_thermal_chip rcar_gen2_thermal = {
  78         .use_of_thermal = 1,
  79         .has_filonoff = 1,
  80         .irq_per_ch = 0,
  81         .needs_suspend_resume = 0,
  82         .nirqs = 1,
  83 };
  84
  85 static const struct rcar_thermal_chip rcar_gen3_thermal = {
  86         .use_of_thermal = 1,
  87         .has_filonoff = 0,
  88         .irq_per_ch = 1,
  89         .needs_suspend_resume = 1,
  90         /*
  91          * The Gen3 chip has 3 interrupts, but this driver uses only 2
  92          * interrupts to detect a temperature change, rise or fall.
  93          */
  94         .nirqs = 2,
  95 };
  96
  97 struct rcar_thermal_priv {
  98         void __iomem *base;
  99         struct rcar_thermal_common *common;
 100         struct thermal_zone_device *zone;
 101         const struct rcar_thermal_chip *chip;
 102         struct delayed_work work;
 103         struct mutex lock;
 104         struct list_head list;
 105         int id;
 106         u32 ctemp;
 107 };
 108
 109 #define rcar_thermal_for_each_priv(pos, common) \
 110         list_for_each_entry(pos, &common->head, list)
 111
 112 #define MCELSIUS(temp)                  ((temp) * 1000)
 113 #define rcar_zone_to_priv(zone)         ((zone)->devdata)
 114 #define rcar_priv_to_dev(priv)          ((priv)->common->dev)
 115 #define rcar_has_irq_support(priv)      ((priv)->common->base)
 116 #define rcar_id_to_shift(priv)          ((priv)->id * 8)
 117
 118 static const struct of_device_id rcar_thermal_dt_ids[] = {
 119         {
 120                 .compatible = "renesas,rcar-thermal",
 121                 .data = &rcar_thermal,
 122         },
 123         {
 124                 .compatible = "renesas,rcar-gen2-thermal",
 125                  .data = &rcar_gen2_thermal,
 126         },
 127         {
 128                 .compatible = "renesas,thermal-r8a77995",
 129                 .data = &rcar_gen3_thermal,
 130         },
 131         {},
 132 };
 133 MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
 134
 135 /*
 136  *              basic functions
 137  */
 138 #define rcar_thermal_common_read(c, r) \
 139         _rcar_thermal_common_read(c, COMMON_ ##r)
 140 static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
 141                                      u32 reg)
 142 {
 143         return ioread32(common->base + reg);
 144 }
 145
 146 #define rcar_thermal_common_write(c, r, d) \
 147         _rcar_thermal_common_write(c, COMMON_ ##r, d)
 148 static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
 149                                        u32 reg, u32 data)
 150 {
 151         iowrite32(data, common->base + reg);
 152 }
 153
 154 #define rcar_thermal_common_bset(c, r, m, d) \
 155         _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
 156 static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
 157                                       u32 reg, u32 mask, u32 data)
 158 {
 159         u32 val;
 160
 161         val = ioread32(common->base + reg);
 162         val &= ~mask;
 163         val |= (data & mask);
 164         iowrite32(val, common->base + reg);
 165 }
 166
 167 #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
 168 static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
 169 {
 170         return ioread32(priv->base + reg);
 171 }
 172
 173 #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
 174 static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
 175                                 u32 reg, u32 data)
 176 {
 177         iowrite32(data, priv->base + reg);
 178 }
 179
 180 #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
 181 static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
 182                                u32 mask, u32 data)
 183 {
 184         u32 val;
 185
 186         val = ioread32(priv->base + reg);
 187         val &= ~mask;
 188         val |= (data & mask);
 189         iowrite32(val, priv->base + reg);
 190 }
 191
 192 /*
 193  *              zone device functions
 194  */
 195 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
 196 {
 197         struct device *dev = rcar_priv_to_dev(priv);
 198         int i;
 199         u32 ctemp, old, new;
 200         int ret = -EINVAL;
 201
 202         mutex_lock(&priv->lock);
 203
 204         /*
 205          * TSC decides a value of CPTAP automatically,
 206          * and this is the conditions which validate interrupt.
 207          */
 208         rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
 209
 210         ctemp = 0;
 211         old = ~0;
 212         for (i = 0; i < 128; i++) {
 213                 /*
 214                  * we need to wait 300us after changing comparator offset
 215                  * to get stable temperature.
 216                  * see "Usage Notes" on datasheet
 217                  */
 218                 udelay(300);
 219
 220                 new = rcar_thermal_read(priv, THSSR) & CTEMP;
 221                 if (new == old) {
 222                         ctemp = new;
 223                         break;
 224                 }
 225                 old = new;
 226         }
 227
 228         if (!ctemp) {
 229                 dev_err(dev, "thermal sensor was broken\n");
 230                 goto err_out_unlock;
 231         }
 232
 233         /*
 234          * enable IRQ
 235          */
 236         if (rcar_has_irq_support(priv)) {
 237                 if (priv->chip->has_filonoff)
 238                         rcar_thermal_write(priv, FILONOFF, 0);
 239
 240                 /* enable Rising/Falling edge interrupt */
 241                 rcar_thermal_write(priv, POSNEG,  0x1);
 242                 rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
 243                                                    ((ctemp - 1) << 0)));
 244         }
 245
 246         dev_dbg(dev, "thermal%d  %d -> %d\n", priv->id, priv->ctemp, ctemp);
 247
 248         priv->ctemp = ctemp;
 249         ret = 0;
 250 err_out_unlock:
 251         mutex_unlock(&priv->lock);
 252         return ret;
 253 }
 254
 255 static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
 256                                          int *temp)
 257 {
 258         int tmp;
 259         int ret;
 260
 261         ret = rcar_thermal_update_temp(priv);
 262         if (ret < 0)
 263                 return ret;
 264
 265         mutex_lock(&priv->lock);
 266         tmp =  MCELSIUS((priv->ctemp * 5) - 65);
 267         mutex_unlock(&priv->lock);
 268
 269         if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) {
 270                 struct device *dev = rcar_priv_to_dev(priv);
 271
 272                 dev_err(dev, "it couldn't measure temperature correctly\n");
 273                 return -EIO;
 274         }
 275
 276         *temp = tmp;
 277
 278         return 0;
 279 }
 280
 281 static int rcar_thermal_of_get_temp(void *data, int *temp)
 282 {
 283         struct rcar_thermal_priv *priv = data;
 284
 285         return rcar_thermal_get_current_temp(priv, temp);
 286 }
 287
 288 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
 289 {
 290         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 291
 292         return rcar_thermal_get_current_temp(priv, temp);
 293 }
 294
 295 static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
 296                                       int trip, enum thermal_trip_type *type)
 297 {
 298         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 299         struct device *dev = rcar_priv_to_dev(priv);
 300
 301         /* see rcar_thermal_get_temp() */
 302         switch (trip) {
 303         case 0: /* +90 <= temp */
 304                 *type = THERMAL_TRIP_CRITICAL;
 305                 break;
 306         default:
 307                 dev_err(dev, "rcar driver trip error\n");
 308                 return -EINVAL;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
 315                                       int trip, int *temp)
 316 {
 317         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 318         struct device *dev = rcar_priv_to_dev(priv);
 319
 320         /* see rcar_thermal_get_temp() */
 321         switch (trip) {
 322         case 0: /* +90 <= temp */
 323                 *temp = MCELSIUS(90);
 324                 break;
 325         default:
 326                 dev_err(dev, "rcar driver trip error\n");
 327                 return -EINVAL;
 328         }
 329
 330         return 0;
 331 }
 332
 333 static int rcar_thermal_notify(struct thermal_zone_device *zone,
 334                                int trip, enum thermal_trip_type type)
 335 {
 336         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 337         struct device *dev = rcar_priv_to_dev(priv);
 338
 339         switch (type) {
 340         case THERMAL_TRIP_CRITICAL:
 341                 /* FIXME */
 342                 dev_warn(dev, "Thermal reached to critical temperature\n");
 343                 break;
 344         default:
 345                 break;
 346         }
 347
 348         return 0;
 349 }
 350
 351 static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
 352         .get_temp       = rcar_thermal_of_get_temp,
 353 };
 354
 355 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
 356         .get_temp       = rcar_thermal_get_temp,
 357         .get_trip_type  = rcar_thermal_get_trip_type,
 358         .get_trip_temp  = rcar_thermal_get_trip_temp,
 359         .notify         = rcar_thermal_notify,
 360 };
 361
 362 /*
 363  *              interrupt
 364  */
 365 #define rcar_thermal_irq_enable(p)      _rcar_thermal_irq_ctrl(p, 1)
 366 #define rcar_thermal_irq_disable(p)     _rcar_thermal_irq_ctrl(p, 0)
 367 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
 368 {
 369         struct rcar_thermal_common *common = priv->common;
 370         unsigned long flags;
 371         u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
 372
 373         if (!rcar_has_irq_support(priv))
 374                 return;
 375
 376         spin_lock_irqsave(&common->lock, flags);
 377
 378         rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
 379
 380         spin_unlock_irqrestore(&common->lock, flags);
 381 }
 382
 383 static void rcar_thermal_work(struct work_struct *work)
 384 {
 385         struct rcar_thermal_priv *priv;
 386         int cctemp, nctemp;
 387         int ret;
 388
 389         priv = container_of(work, struct rcar_thermal_priv, work.work);
 390
 391         ret = rcar_thermal_get_current_temp(priv, &cctemp);
 392         if (ret < 0)
 393                 return;
 394
 395         ret = rcar_thermal_update_temp(priv);
 396         if (ret < 0)
 397                 return;
 398
 399         rcar_thermal_irq_enable(priv);
 400
 401         ret = rcar_thermal_get_current_temp(priv, &nctemp);
 402         if (ret < 0)
 403                 return;
 404
 405         if (nctemp != cctemp)
 406                 thermal_zone_device_update(priv->zone,
 407                                            THERMAL_EVENT_UNSPECIFIED);
 408 }
 409
 410 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
 411 {
 412         struct device *dev = rcar_priv_to_dev(priv);
 413
 414         status = (status >> rcar_id_to_shift(priv)) & 0x3;
 415
 416         if (status) {
 417                 dev_dbg(dev, "thermal%d %s%s\n",
 418                         priv->id,
 419                         (status & 0x2) ? "Rising " : "",
 420                         (status & 0x1) ? "Falling" : "");
 421         }
 422
 423         return status;
 424 }
 425
 426 static irqreturn_t rcar_thermal_irq(int irq, void *data)
 427 {
 428         struct rcar_thermal_common *common = data;
 429         struct rcar_thermal_priv *priv;
 430         unsigned long flags;
 431         u32 status, mask;
 432
 433         spin_lock_irqsave(&common->lock, flags);
 434
 435         mask    = rcar_thermal_common_read(common, INTMSK);
 436         status  = rcar_thermal_common_read(common, STR);
 437         rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
 438
 439         spin_unlock_irqrestore(&common->lock, flags);
 440
 441         status = status & ~mask;
 442
 443         /*
 444          * check the status
 445          */
 446         rcar_thermal_for_each_priv(priv, common) {
 447                 if (rcar_thermal_had_changed(priv, status)) {
 448                         rcar_thermal_irq_disable(priv);
 449                         schedule_delayed_work(&priv->work,
 450                                               msecs_to_jiffies(300));
 451                 }
 452         }
 453
 454         return IRQ_HANDLED;
 455 }
 456
 457 /*
 458  *              platform functions
 459  */
 460 static int rcar_thermal_remove(struct platform_device *pdev)
 461 {
 462         struct rcar_thermal_common *common = platform_get_drvdata(pdev);
 463         struct device *dev = &pdev->dev;
 464         struct rcar_thermal_priv *priv;
 465
 466         rcar_thermal_for_each_priv(priv, common) {
 467                 rcar_thermal_irq_disable(priv);
 468                 if (priv->chip->use_of_thermal)
 469                         thermal_remove_hwmon_sysfs(priv->zone);
 470                 else
 471                         thermal_zone_device_unregister(priv->zone);
 472         }
 473
 474         pm_runtime_put(dev);
 475         pm_runtime_disable(dev);
 476
 477         return 0;
 478 }
 479
 480 static int rcar_thermal_probe(struct platform_device *pdev)
 481 {
 482         struct rcar_thermal_common *common;
 483         struct rcar_thermal_priv *priv;
 484         struct device *dev = &pdev->dev;
 485         struct resource *res, *irq;
 486         const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
 487         int mres = 0;
 488         int i;
 489         int ret = -ENODEV;
 490         int idle = IDLE_INTERVAL;
 491         u32 enr_bits = 0;
 492
 493         common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
 494         if (!common)
 495                 return -ENOMEM;
 496
 497         platform_set_drvdata(pdev, common);
 498
 499         INIT_LIST_HEAD(&common->head);
 500         spin_lock_init(&common->lock);
 501         common->dev = dev;
 502
 503         pm_runtime_enable(dev);
 504         pm_runtime_get_sync(dev);
 505
 506         for (i = 0; i < chip->nirqs; i++) {
 507                 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 508                 if (!irq)
 509                         continue;
 510                 if (!common->base) {
 511                         /*
 512                          * platform has IRQ support.
 513                          * Then, driver uses common registers
 514                          * rcar_has_irq_support() will be enabled
 515                          */
 516                         res = platform_get_resource(pdev, IORESOURCE_MEM,
 517                                                     mres++);
 518                         common->base = devm_ioremap_resource(dev, res);
 519                         if (IS_ERR(common->base))
 520                                 return PTR_ERR(common->base);
 521
 522                         idle = 0; /* polling delay is not needed */
 523                 }
 524
 525                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
 526                                        IRQF_SHARED, dev_name(dev), common);
 527                 if (ret) {
 528                         dev_err(dev, "irq request failed\n ");
 529                         goto error_unregister;
 530                 }
 531
 532                 /* update ENR bits */
 533                 if (chip->irq_per_ch)
 534                         enr_bits |= 1 << i;
 535         }
 536
 537         for (i = 0;; i++) {
 538                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
 539                 if (!res)
 540                         break;
 541
 542                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 543                 if (!priv) {
 544                         ret = -ENOMEM;
 545                         goto error_unregister;
 546                 }
 547
 548                 priv->base = devm_ioremap_resource(dev, res);
 549                 if (IS_ERR(priv->base)) {
 550                         ret = PTR_ERR(priv->base);
 551                         goto error_unregister;
 552                 }
 553
 554                 priv->common = common;
 555                 priv->id = i;
 556                 priv->chip = chip;
 557                 mutex_init(&priv->lock);
 558                 INIT_LIST_HEAD(&priv->list);
 559                 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
 560                 ret = rcar_thermal_update_temp(priv);
 561                 if (ret < 0)
 562                         goto error_unregister;
 563
 564                 if (chip->use_of_thermal)
 565                         priv->zone = devm_thermal_zone_of_sensor_register(
 566                                                 dev, i, priv,
 567                                                 &rcar_thermal_zone_of_ops);
 568                 else
 569                         priv->zone = thermal_zone_device_register(
 570                                                 "rcar_thermal",
 571                                                 1, 0, priv,
 572                                                 &rcar_thermal_zone_ops, NULL, 0,
 573                                                 idle);
 574                 if (IS_ERR(priv->zone)) {
 575                         dev_err(dev, "can't register thermal zone\n");
 576                         ret = PTR_ERR(priv->zone);
 577                         priv->zone = NULL;
 578                         goto error_unregister;
 579                 }
 580
 581                 if (chip->use_of_thermal) {
 582                         /*
 583                          * thermal_zone doesn't enable hwmon as default,
 584                          * but, enable it here to keep compatible
 585                          */
 586                         priv->zone->tzp->no_hwmon = false;
 587                         ret = thermal_add_hwmon_sysfs(priv->zone);
 588                         if (ret)
 589                                 goto error_unregister;
 590                 }
 591
 592                 rcar_thermal_irq_enable(priv);
 593
 594                 list_move_tail(&priv->list, &common->head);
 595
 596                 /* update ENR bits */
 597                 if (!chip->irq_per_ch)
 598                         enr_bits |= 3 << (i * 8);
 599         }
 600
 601         if (common->base && enr_bits)
 602                 rcar_thermal_common_write(common, ENR, enr_bits);
 603
 604         dev_info(dev, "%d sensor probed\n", i);
 605
 606         return 0;
 607
 608 error_unregister:
 609         rcar_thermal_remove(pdev);
 610
 611         return ret;
 612 }
 613
 614 #ifdef CONFIG_PM_SLEEP
 615 static int rcar_thermal_suspend(struct device *dev)
 616 {
 617         struct rcar_thermal_common *common = dev_get_drvdata(dev);
 618         struct rcar_thermal_priv *priv = list_first_entry(&common->head,
 619                                                           typeof(*priv), list);
 620
 621         if (priv->chip->needs_suspend_resume) {
 622                 rcar_thermal_common_write(common, ENR, 0);
 623                 rcar_thermal_irq_disable(priv);
 624                 rcar_thermal_bset(priv, THSCR, CPCTL, 0);
 625         }
 626
 627         return 0;
 628 }
 629
 630 static int rcar_thermal_resume(struct device *dev)
 631 {
 632         struct rcar_thermal_common *common = dev_get_drvdata(dev);
 633         struct rcar_thermal_priv *priv = list_first_entry(&common->head,
 634                                                           typeof(*priv), list);
 635         int ret;
 636
 637         if (priv->chip->needs_suspend_resume) {
 638                 ret = rcar_thermal_update_temp(priv);
 639                 if (ret < 0)
 640                         return ret;
 641                 rcar_thermal_irq_enable(priv);
 642                 rcar_thermal_common_write(common, ENR, 0x03);
 643         }
 644
 645         return 0;
 646 }
 647 #endif
 648
 649 static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
 650                          rcar_thermal_resume);
 651
 652 static struct platform_driver rcar_thermal_driver = {
 653         .driver = {
 654                 .name   = "rcar_thermal",
 655                 .pm = &rcar_thermal_pm_ops,
 656                 .of_match_table = rcar_thermal_dt_ids,
 657         },
 658         .probe          = rcar_thermal_probe,
 659         .remove         = rcar_thermal_remove,
 660 };
 661 module_platform_driver(rcar_thermal_driver);
 662
 663 MODULE_LICENSE("GPL");
 664 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
 665 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");