drivers/thermal/rcar_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  R-Car THS/TSC thermal sensor driver
   4  *
   5  * Copyright (C) 2012 Renesas Solutions Corp.
   6  * Kuninori Morimoto <[email protected]>
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/err.h>
  10 #include <linux/irq.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/module.h>
  14 #include <linux/of_device.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/reboot.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/thermal.h>
  21
  22 #include "thermal_hwmon.h"
  23
  24 #define IDLE_INTERVAL   5000
  25
  26 #define COMMON_STR      0x00
  27 #define COMMON_ENR      0x04
  28 #define COMMON_INTMSK   0x0c
  29
  30 #define REG_POSNEG      0x20
  31 #define REG_FILONOFF    0x28
  32 #define REG_THSCR       0x2c
  33 #define REG_THSSR       0x30
  34 #define REG_INTCTRL     0x34
  35
  36 /* THSCR */
  37 #define CPCTL   (1 << 12)
  38
  39 /* THSSR */
  40 #define CTEMP   0x3f
  41
  42 struct rcar_thermal_common {
  43         void __iomem *base;
  44         struct device *dev;
  45         struct list_head head;
  46         spinlock_t lock;
  47 };
  48
  49 struct rcar_thermal_chip {
  50         unsigned int use_of_thermal : 1;
  51         unsigned int has_filonoff : 1;
  52         unsigned int irq_per_ch : 1;
  53         unsigned int needs_suspend_resume : 1;
  54         unsigned int nirqs;
  55         unsigned int ctemp_bands;
  56 };
  57
  58 static const struct rcar_thermal_chip rcar_thermal = {
  59         .use_of_thermal = 0,
  60         .has_filonoff = 1,
  61         .irq_per_ch = 0,
  62         .needs_suspend_resume = 0,
  63         .nirqs = 1,
  64         .ctemp_bands = 1,
  65 };
  66
  67 static const struct rcar_thermal_chip rcar_gen2_thermal = {
  68         .use_of_thermal = 1,
  69         .has_filonoff = 1,
  70         .irq_per_ch = 0,
  71         .needs_suspend_resume = 0,
  72         .nirqs = 1,
  73         .ctemp_bands = 1,
  74 };
  75
  76 static const struct rcar_thermal_chip rcar_gen3_thermal = {
  77         .use_of_thermal = 1,
  78         .has_filonoff = 0,
  79         .irq_per_ch = 1,
  80         .needs_suspend_resume = 1,
  81         /*
  82          * The Gen3 chip has 3 interrupts, but this driver uses only 2
  83          * interrupts to detect a temperature change, rise or fall.
  84          */
  85         .nirqs = 2,
  86         .ctemp_bands = 2,
  87 };
  88
  89 struct rcar_thermal_priv {
  90         void __iomem *base;
  91         struct rcar_thermal_common *common;
  92         struct thermal_zone_device *zone;
  93         const struct rcar_thermal_chip *chip;
  94         struct delayed_work work;
  95         struct mutex lock;
  96         struct list_head list;
  97         int id;
  98         u32 ctemp;
  99 };
 100
 101 #define rcar_thermal_for_each_priv(pos, common) \
 102         list_for_each_entry(pos, &common->head, list)
 103
 104 #define MCELSIUS(temp)                  ((temp) * 1000)
 105 #define rcar_zone_to_priv(zone)         ((zone)->devdata)
 106 #define rcar_priv_to_dev(priv)          ((priv)->common->dev)
 107 #define rcar_has_irq_support(priv)      ((priv)->common->base)
 108 #define rcar_id_to_shift(priv)          ((priv)->id * 8)
 109
 110 static const struct of_device_id rcar_thermal_dt_ids[] = {
 111         {
 112                 .compatible = "renesas,rcar-thermal",
 113                 .data = &rcar_thermal,
 114         },
 115         {
 116                 .compatible = "renesas,rcar-gen2-thermal",
 117                  .data = &rcar_gen2_thermal,
 118         },
 119         {
 120                 .compatible = "renesas,thermal-r8a774c0",
 121                 .data = &rcar_gen3_thermal,
 122         },
 123         {
 124                 .compatible = "renesas,thermal-r8a77970",
 125                 .data = &rcar_gen3_thermal,
 126         },
 127         {
 128                 .compatible = "renesas,thermal-r8a77990",
 129                 .data = &rcar_gen3_thermal,
 130         },
 131         {
 132                 .compatible = "renesas,thermal-r8a77995",
 133                 .data = &rcar_gen3_thermal,
 134         },
 135         {},
 136 };
 137 MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
 138
 139 /*
 140  *              basic functions
 141  */
 142 #define rcar_thermal_common_read(c, r) \
 143         _rcar_thermal_common_read(c, COMMON_ ##r)
 144 static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
 145                                      u32 reg)
 146 {
 147         return ioread32(common->base + reg);
 148 }
 149
 150 #define rcar_thermal_common_write(c, r, d) \
 151         _rcar_thermal_common_write(c, COMMON_ ##r, d)
 152 static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
 153                                        u32 reg, u32 data)
 154 {
 155         iowrite32(data, common->base + reg);
 156 }
 157
 158 #define rcar_thermal_common_bset(c, r, m, d) \
 159         _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
 160 static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
 161                                       u32 reg, u32 mask, u32 data)
 162 {
 163         u32 val;
 164
 165         val = ioread32(common->base + reg);
 166         val &= ~mask;
 167         val |= (data & mask);
 168         iowrite32(val, common->base + reg);
 169 }
 170
 171 #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
 172 static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
 173 {
 174         return ioread32(priv->base + reg);
 175 }
 176
 177 #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
 178 static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
 179                                 u32 reg, u32 data)
 180 {
 181         iowrite32(data, priv->base + reg);
 182 }
 183
 184 #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
 185 static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
 186                                u32 mask, u32 data)
 187 {
 188         u32 val;
 189
 190         val = ioread32(priv->base + reg);
 191         val &= ~mask;
 192         val |= (data & mask);
 193         iowrite32(val, priv->base + reg);
 194 }
 195
 196 /*
 197  *              zone device functions
 198  */
 199 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
 200 {
 201         struct device *dev = rcar_priv_to_dev(priv);
 202         int i;
 203         u32 ctemp, old, new;
 204         int ret = -EINVAL;
 205
 206         mutex_lock(&priv->lock);
 207
 208         /*
 209          * TSC decides a value of CPTAP automatically,
 210          * and this is the conditions which validate interrupt.
 211          */
 212         rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
 213
 214         ctemp = 0;
 215         old = ~0;
 216         for (i = 0; i < 128; i++) {
 217                 /*
 218                  * we need to wait 300us after changing comparator offset
 219                  * to get stable temperature.
 220                  * see "Usage Notes" on datasheet
 221                  */
 222                 udelay(300);
 223
 224                 new = rcar_thermal_read(priv, THSSR) & CTEMP;
 225                 if (new == old) {
 226                         ctemp = new;
 227                         break;
 228                 }
 229                 old = new;
 230         }
 231
 232         if (!ctemp) {
 233                 dev_err(dev, "thermal sensor was broken\n");
 234                 goto err_out_unlock;
 235         }
 236
 237         /*
 238          * enable IRQ
 239          */
 240         if (rcar_has_irq_support(priv)) {
 241                 if (priv->chip->has_filonoff)
 242                         rcar_thermal_write(priv, FILONOFF, 0);
 243
 244                 /* enable Rising/Falling edge interrupt */
 245                 rcar_thermal_write(priv, POSNEG,  0x1);
 246                 rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
 247                                                    ((ctemp - 1) << 0)));
 248         }
 249
 250         dev_dbg(dev, "thermal%d  %d -> %d\n", priv->id, priv->ctemp, ctemp);
 251
 252         priv->ctemp = ctemp;
 253         ret = 0;
 254 err_out_unlock:
 255         mutex_unlock(&priv->lock);
 256         return ret;
 257 }
 258
 259 static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
 260                                          int *temp)
 261 {
 262         int tmp;
 263         int ret;
 264
 265         ret = rcar_thermal_update_temp(priv);
 266         if (ret < 0)
 267                 return ret;
 268
 269         mutex_lock(&priv->lock);
 270         if (priv->chip->ctemp_bands == 1)
 271                 tmp = MCELSIUS((priv->ctemp * 5) - 65);
 272         else if (priv->ctemp < 24)
 273                 tmp = MCELSIUS(((priv->ctemp * 55) - 720) / 10);
 274         else
 275                 tmp = MCELSIUS((priv->ctemp * 5) - 60);
 276         mutex_unlock(&priv->lock);
 277
 278         if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) {
 279                 struct device *dev = rcar_priv_to_dev(priv);
 280
 281                 dev_err(dev, "it couldn't measure temperature correctly\n");
 282                 return -EIO;
 283         }
 284
 285         *temp = tmp;
 286
 287         return 0;
 288 }
 289
 290 static int rcar_thermal_of_get_temp(void *data, int *temp)
 291 {
 292         struct rcar_thermal_priv *priv = data;
 293
 294         return rcar_thermal_get_current_temp(priv, temp);
 295 }
 296
 297 static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
 298 {
 299         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 300
 301         return rcar_thermal_get_current_temp(priv, temp);
 302 }
 303
 304 static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
 305                                       int trip, enum thermal_trip_type *type)
 306 {
 307         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 308         struct device *dev = rcar_priv_to_dev(priv);
 309
 310         /* see rcar_thermal_get_temp() */
 311         switch (trip) {
 312         case 0: /* +90 <= temp */
 313                 *type = THERMAL_TRIP_CRITICAL;
 314                 break;
 315         default:
 316                 dev_err(dev, "rcar driver trip error\n");
 317                 return -EINVAL;
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
 324                                       int trip, int *temp)
 325 {
 326         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 327         struct device *dev = rcar_priv_to_dev(priv);
 328
 329         /* see rcar_thermal_get_temp() */
 330         switch (trip) {
 331         case 0: /* +90 <= temp */
 332                 *temp = MCELSIUS(90);
 333                 break;
 334         default:
 335                 dev_err(dev, "rcar driver trip error\n");
 336                 return -EINVAL;
 337         }
 338
 339         return 0;
 340 }
 341
 342 static int rcar_thermal_notify(struct thermal_zone_device *zone,
 343                                int trip, enum thermal_trip_type type)
 344 {
 345         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 346         struct device *dev = rcar_priv_to_dev(priv);
 347
 348         switch (type) {
 349         case THERMAL_TRIP_CRITICAL:
 350                 /* FIXME */
 351                 dev_warn(dev, "Thermal reached to critical temperature\n");
 352                 break;
 353         default:
 354                 break;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
 361         .get_temp       = rcar_thermal_of_get_temp,
 362 };
 363
 364 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
 365         .get_temp       = rcar_thermal_get_temp,
 366         .get_trip_type  = rcar_thermal_get_trip_type,
 367         .get_trip_temp  = rcar_thermal_get_trip_temp,
 368         .notify         = rcar_thermal_notify,
 369 };
 370
 371 /*
 372  *              interrupt
 373  */
 374 #define rcar_thermal_irq_enable(p)      _rcar_thermal_irq_ctrl(p, 1)
 375 #define rcar_thermal_irq_disable(p)     _rcar_thermal_irq_ctrl(p, 0)
 376 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
 377 {
 378         struct rcar_thermal_common *common = priv->common;
 379         unsigned long flags;
 380         u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
 381
 382         if (!rcar_has_irq_support(priv))
 383                 return;
 384
 385         spin_lock_irqsave(&common->lock, flags);
 386
 387         rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
 388
 389         spin_unlock_irqrestore(&common->lock, flags);
 390 }
 391
 392 static void rcar_thermal_work(struct work_struct *work)
 393 {
 394         struct rcar_thermal_priv *priv;
 395         int cctemp, nctemp;
 396         int ret;
 397
 398         priv = container_of(work, struct rcar_thermal_priv, work.work);
 399
 400         ret = rcar_thermal_get_current_temp(priv, &cctemp);
 401         if (ret < 0)
 402                 return;
 403
 404         ret = rcar_thermal_update_temp(priv);
 405         if (ret < 0)
 406                 return;
 407
 408         rcar_thermal_irq_enable(priv);
 409
 410         ret = rcar_thermal_get_current_temp(priv, &nctemp);
 411         if (ret < 0)
 412                 return;
 413
 414         if (nctemp != cctemp)
 415                 thermal_zone_device_update(priv->zone,
 416                                            THERMAL_EVENT_UNSPECIFIED);
 417 }
 418
 419 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
 420 {
 421         struct device *dev = rcar_priv_to_dev(priv);
 422
 423         status = (status >> rcar_id_to_shift(priv)) & 0x3;
 424
 425         if (status) {
 426                 dev_dbg(dev, "thermal%d %s%s\n",
 427                         priv->id,
 428                         (status & 0x2) ? "Rising " : "",
 429                         (status & 0x1) ? "Falling" : "");
 430         }
 431
 432         return status;
 433 }
 434
 435 static irqreturn_t rcar_thermal_irq(int irq, void *data)
 436 {
 437         struct rcar_thermal_common *common = data;
 438         struct rcar_thermal_priv *priv;
 439         unsigned long flags;
 440         u32 status, mask;
 441
 442         spin_lock_irqsave(&common->lock, flags);
 443
 444         mask    = rcar_thermal_common_read(common, INTMSK);
 445         status  = rcar_thermal_common_read(common, STR);
 446         rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
 447
 448         spin_unlock_irqrestore(&common->lock, flags);
 449
 450         status = status & ~mask;
 451
 452         /*
 453          * check the status
 454          */
 455         rcar_thermal_for_each_priv(priv, common) {
 456                 if (rcar_thermal_had_changed(priv, status)) {
 457                         rcar_thermal_irq_disable(priv);
 458                         queue_delayed_work(system_freezable_wq, &priv->work,
 459                                            msecs_to_jiffies(300));
 460                 }
 461         }
 462
 463         return IRQ_HANDLED;
 464 }
 465
 466 /*
 467  *              platform functions
 468  */
 469 static int rcar_thermal_remove(struct platform_device *pdev)
 470 {
 471         struct rcar_thermal_common *common = platform_get_drvdata(pdev);
 472         struct device *dev = &pdev->dev;
 473         struct rcar_thermal_priv *priv;
 474
 475         rcar_thermal_for_each_priv(priv, common) {
 476                 rcar_thermal_irq_disable(priv);
 477                 cancel_delayed_work_sync(&priv->work);
 478                 if (priv->chip->use_of_thermal)
 479                         thermal_remove_hwmon_sysfs(priv->zone);
 480                 else
 481                         thermal_zone_device_unregister(priv->zone);
 482         }
 483
 484         pm_runtime_put(dev);
 485         pm_runtime_disable(dev);
 486
 487         return 0;
 488 }
 489
 490 static int rcar_thermal_probe(struct platform_device *pdev)
 491 {
 492         struct rcar_thermal_common *common;
 493         struct rcar_thermal_priv *priv;
 494         struct device *dev = &pdev->dev;
 495         struct resource *res, *irq;
 496         const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
 497         int mres = 0;
 498         int i;
 499         int ret = -ENODEV;
 500         int idle = IDLE_INTERVAL;
 501         u32 enr_bits = 0;
 502
 503         common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
 504         if (!common)
 505                 return -ENOMEM;
 506
 507         platform_set_drvdata(pdev, common);
 508
 509         INIT_LIST_HEAD(&common->head);
 510         spin_lock_init(&common->lock);
 511         common->dev = dev;
 512
 513         pm_runtime_enable(dev);
 514         pm_runtime_get_sync(dev);
 515
 516         for (i = 0; i < chip->nirqs; i++) {
 517                 irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
 518                 if (!irq)
 519                         continue;
 520                 if (!common->base) {
 521                         /*
 522                          * platform has IRQ support.
 523                          * Then, driver uses common registers
 524                          * rcar_has_irq_support() will be enabled
 525                          */
 526                         res = platform_get_resource(pdev, IORESOURCE_MEM,
 527                                                     mres++);
 528                         common->base = devm_ioremap_resource(dev, res);
 529                         if (IS_ERR(common->base))
 530                                 return PTR_ERR(common->base);
 531
 532                         idle = 0; /* polling delay is not needed */
 533                 }
 534
 535                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
 536                                        IRQF_SHARED, dev_name(dev), common);
 537                 if (ret) {
 538                         dev_err(dev, "irq request failed\n ");
 539                         goto error_unregister;
 540                 }
 541
 542                 /* update ENR bits */
 543                 if (chip->irq_per_ch)
 544                         enr_bits |= 1 << i;
 545         }
 546
 547         for (i = 0;; i++) {
 548                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
 549                 if (!res)
 550                         break;
 551
 552                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 553                 if (!priv) {
 554                         ret = -ENOMEM;
 555                         goto error_unregister;
 556                 }
 557
 558                 priv->base = devm_ioremap_resource(dev, res);
 559                 if (IS_ERR(priv->base)) {
 560                         ret = PTR_ERR(priv->base);
 561                         goto error_unregister;
 562                 }
 563
 564                 priv->common = common;
 565                 priv->id = i;
 566                 priv->chip = chip;
 567                 mutex_init(&priv->lock);
 568                 INIT_LIST_HEAD(&priv->list);
 569                 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
 570                 ret = rcar_thermal_update_temp(priv);
 571                 if (ret < 0)
 572                         goto error_unregister;
 573
 574                 if (chip->use_of_thermal)
 575                         priv->zone = devm_thermal_zone_of_sensor_register(
 576                                                 dev, i, priv,
 577                                                 &rcar_thermal_zone_of_ops);
 578                 else
 579                         priv->zone = thermal_zone_device_register(
 580                                                 "rcar_thermal",
 581                                                 1, 0, priv,
 582                                                 &rcar_thermal_zone_ops, NULL, 0,
 583                                                 idle);
 584                 if (IS_ERR(priv->zone)) {
 585                         dev_err(dev, "can't register thermal zone\n");
 586                         ret = PTR_ERR(priv->zone);
 587                         priv->zone = NULL;
 588                         goto error_unregister;
 589                 }
 590
 591                 if (chip->use_of_thermal) {
 592                         /*
 593                          * thermal_zone doesn't enable hwmon as default,
 594                          * but, enable it here to keep compatible
 595                          */
 596                         priv->zone->tzp->no_hwmon = false;
 597                         ret = thermal_add_hwmon_sysfs(priv->zone);
 598                         if (ret)
 599                                 goto error_unregister;
 600                 }
 601
 602                 rcar_thermal_irq_enable(priv);
 603
 604                 list_move_tail(&priv->list, &common->head);
 605
 606                 /* update ENR bits */
 607                 if (!chip->irq_per_ch)
 608                         enr_bits |= 3 << (i * 8);
 609         }
 610
 611         if (common->base && enr_bits)
 612                 rcar_thermal_common_write(common, ENR, enr_bits);
 613
 614         dev_info(dev, "%d sensor probed\n", i);
 615
 616         return 0;
 617
 618 error_unregister:
 619         rcar_thermal_remove(pdev);
 620
 621         return ret;
 622 }
 623
 624 #ifdef CONFIG_PM_SLEEP
 625 static int rcar_thermal_suspend(struct device *dev)
 626 {
 627         struct rcar_thermal_common *common = dev_get_drvdata(dev);
 628         struct rcar_thermal_priv *priv = list_first_entry(&common->head,
 629                                                           typeof(*priv), list);
 630
 631         if (priv->chip->needs_suspend_resume) {
 632                 rcar_thermal_common_write(common, ENR, 0);
 633                 rcar_thermal_irq_disable(priv);
 634                 rcar_thermal_bset(priv, THSCR, CPCTL, 0);
 635         }
 636
 637         return 0;
 638 }
 639
 640 static int rcar_thermal_resume(struct device *dev)
 641 {
 642         struct rcar_thermal_common *common = dev_get_drvdata(dev);
 643         struct rcar_thermal_priv *priv = list_first_entry(&common->head,
 644                                                           typeof(*priv), list);
 645         int ret;
 646
 647         if (priv->chip->needs_suspend_resume) {
 648                 ret = rcar_thermal_update_temp(priv);
 649                 if (ret < 0)
 650                         return ret;
 651                 rcar_thermal_irq_enable(priv);
 652                 rcar_thermal_common_write(common, ENR, 0x03);
 653         }
 654
 655         return 0;
 656 }
 657 #endif
 658
 659 static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
 660                          rcar_thermal_resume);
 661
 662 static struct platform_driver rcar_thermal_driver = {
 663         .driver = {
 664                 .name   = "rcar_thermal",
 665                 .pm = &rcar_thermal_pm_ops,
 666                 .of_match_table = rcar_thermal_dt_ids,
 667         },
 668         .probe          = rcar_thermal_probe,
 669         .remove         = rcar_thermal_remove,
 670 };
 671 module_platform_driver(rcar_thermal_driver);
 672
 673 MODULE_LICENSE("GPL v2");
 674 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
 675 MODULE_AUTHOR("Kuninori Morimoto <[email protected]>");