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 = 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                         goto error_unregister;
 508                 }
 509
 510                 rcar_thermal_irq_enable(priv);
 511
 512                 list_move_tail(&priv->list, &common->head);
 513
 514                 /* update ENR bits */
 515                 enr_bits |= 3 << (i * 8);
 516         }
 517
 518         /* enable temperature comparation */
 519         if (irq) {
 520                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
 521                                        dev_name(dev), common);
 522                 if (ret) {
 523                         dev_err(dev, "irq request failed\n ");
 524                         goto error_unregister;
 525                 }
 526
 527                 rcar_thermal_common_write(common, ENR, enr_bits);
 528         }
 529
 530         dev_info(dev, "%d sensor probed\n", i);
 531
 532         return 0;
 533
 534 error_unregister:
 535         rcar_thermal_remove(pdev);
 536
 537         return ret;
 538 }
 539
 540 static struct platform_driver rcar_thermal_driver = {
 541         .driver = {
 542                 .name   = "rcar_thermal",
 543                 .of_match_table = rcar_thermal_dt_ids,
 544         },
 545         .probe          = rcar_thermal_probe,
 546         .remove         = rcar_thermal_remove,
 547 };
 548 module_platform_driver(rcar_thermal_driver);
 549
 550 MODULE_LICENSE("GPL");
 551 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
 552 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");