drivers/clocksource/sh_tmu.c

   1 /*
   2  * SuperH Timer Support - TMU
   3  *
   4  *  Copyright (C) 2009 Magnus Damm
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/clockchips.h>
  18 #include <linux/clocksource.h>
  19 #include <linux/delay.h>
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/io.h>
  24 #include <linux/ioport.h>
  25 #include <linux/irq.h>
  26 #include <linux/module.h>
  27 #include <linux/of.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/pm_domain.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/sh_timer.h>
  32 #include <linux/slab.h>
  33 #include <linux/spinlock.h>
  34
  35 enum sh_tmu_model {
  36         SH_TMU,
  37         SH_TMU_SH3,
  38 };
  39
  40 struct sh_tmu_device;
  41
  42 struct sh_tmu_channel {
  43         struct sh_tmu_device *tmu;
  44         unsigned int index;
  45
  46         void __iomem *base;
  47         int irq;
  48
  49         unsigned long rate;
  50         unsigned long periodic;
  51         struct clock_event_device ced;
  52         struct clocksource cs;
  53         bool cs_enabled;
  54         unsigned int enable_count;
  55 };
  56
  57 struct sh_tmu_device {
  58         struct platform_device *pdev;
  59
  60         void __iomem *mapbase;
  61         struct clk *clk;
  62
  63         enum sh_tmu_model model;
  64
  65         raw_spinlock_t lock; /* Protect the shared start/stop register */
  66
  67         struct sh_tmu_channel *channels;
  68         unsigned int num_channels;
  69
  70         bool has_clockevent;
  71         bool has_clocksource;
  72 };
  73
  74 #define TSTR -1 /* shared register */
  75 #define TCOR  0 /* channel register */
  76 #define TCNT 1 /* channel register */
  77 #define TCR 2 /* channel register */
  78
  79 #define TCR_UNF                 (1 << 8)
  80 #define TCR_UNIE                (1 << 5)
  81 #define TCR_TPSC_CLK4           (0 << 0)
  82 #define TCR_TPSC_CLK16          (1 << 0)
  83 #define TCR_TPSC_CLK64          (2 << 0)
  84 #define TCR_TPSC_CLK256         (3 << 0)
  85 #define TCR_TPSC_CLK1024        (4 << 0)
  86 #define TCR_TPSC_MASK           (7 << 0)
  87
  88 static inline unsigned long sh_tmu_read(struct sh_tmu_channel *ch, int reg_nr)
  89 {
  90         unsigned long offs;
  91
  92         if (reg_nr == TSTR) {
  93                 switch (ch->tmu->model) {
  94                 case SH_TMU_SH3:
  95                         return ioread8(ch->tmu->mapbase + 2);
  96                 case SH_TMU:
  97                         return ioread8(ch->tmu->mapbase + 4);
  98                 }
  99         }
 100
 101         offs = reg_nr << 2;
 102
 103         if (reg_nr == TCR)
 104                 return ioread16(ch->base + offs);
 105         else
 106                 return ioread32(ch->base + offs);
 107 }
 108
 109 static inline void sh_tmu_write(struct sh_tmu_channel *ch, int reg_nr,
 110                                 unsigned long value)
 111 {
 112         unsigned long offs;
 113
 114         if (reg_nr == TSTR) {
 115                 switch (ch->tmu->model) {
 116                 case SH_TMU_SH3:
 117                         return iowrite8(value, ch->tmu->mapbase + 2);
 118                 case SH_TMU:
 119                         return iowrite8(value, ch->tmu->mapbase + 4);
 120                 }
 121         }
 122
 123         offs = reg_nr << 2;
 124
 125         if (reg_nr == TCR)
 126                 iowrite16(value, ch->base + offs);
 127         else
 128                 iowrite32(value, ch->base + offs);
 129 }
 130
 131 static void sh_tmu_start_stop_ch(struct sh_tmu_channel *ch, int start)
 132 {
 133         unsigned long flags, value;
 134
 135         /* start stop register shared by multiple timer channels */
 136         raw_spin_lock_irqsave(&ch->tmu->lock, flags);
 137         value = sh_tmu_read(ch, TSTR);
 138
 139         if (start)
 140                 value |= 1 << ch->index;
 141         else
 142                 value &= ~(1 << ch->index);
 143
 144         sh_tmu_write(ch, TSTR, value);
 145         raw_spin_unlock_irqrestore(&ch->tmu->lock, flags);
 146 }
 147
 148 static int __sh_tmu_enable(struct sh_tmu_channel *ch)
 149 {
 150         int ret;
 151
 152         /* enable clock */
 153         ret = clk_enable(ch->tmu->clk);
 154         if (ret) {
 155                 dev_err(&ch->tmu->pdev->dev, "ch%u: cannot enable clock\n",
 156                         ch->index);
 157                 return ret;
 158         }
 159
 160         /* make sure channel is disabled */
 161         sh_tmu_start_stop_ch(ch, 0);
 162
 163         /* maximum timeout */
 164         sh_tmu_write(ch, TCOR, 0xffffffff);
 165         sh_tmu_write(ch, TCNT, 0xffffffff);
 166
 167         /* configure channel to parent clock / 4, irq off */
 168         ch->rate = clk_get_rate(ch->tmu->clk) / 4;
 169         sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
 170
 171         /* enable channel */
 172         sh_tmu_start_stop_ch(ch, 1);
 173
 174         return 0;
 175 }
 176
 177 static int sh_tmu_enable(struct sh_tmu_channel *ch)
 178 {
 179         if (ch->enable_count++ > 0)
 180                 return 0;
 181
 182         pm_runtime_get_sync(&ch->tmu->pdev->dev);
 183         dev_pm_syscore_device(&ch->tmu->pdev->dev, true);
 184
 185         return __sh_tmu_enable(ch);
 186 }
 187
 188 static void __sh_tmu_disable(struct sh_tmu_channel *ch)
 189 {
 190         /* disable channel */
 191         sh_tmu_start_stop_ch(ch, 0);
 192
 193         /* disable interrupts in TMU block */
 194         sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
 195
 196         /* stop clock */
 197         clk_disable(ch->tmu->clk);
 198 }
 199
 200 static void sh_tmu_disable(struct sh_tmu_channel *ch)
 201 {
 202         if (WARN_ON(ch->enable_count == 0))
 203                 return;
 204
 205         if (--ch->enable_count > 0)
 206                 return;
 207
 208         __sh_tmu_disable(ch);
 209
 210         dev_pm_syscore_device(&ch->tmu->pdev->dev, false);
 211         pm_runtime_put(&ch->tmu->pdev->dev);
 212 }
 213
 214 static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta,
 215                             int periodic)
 216 {
 217         /* stop timer */
 218         sh_tmu_start_stop_ch(ch, 0);
 219
 220         /* acknowledge interrupt */
 221         sh_tmu_read(ch, TCR);
 222
 223         /* enable interrupt */
 224         sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
 225
 226         /* reload delta value in case of periodic timer */
 227         if (periodic)
 228                 sh_tmu_write(ch, TCOR, delta);
 229         else
 230                 sh_tmu_write(ch, TCOR, 0xffffffff);
 231
 232         sh_tmu_write(ch, TCNT, delta);
 233
 234         /* start timer */
 235         sh_tmu_start_stop_ch(ch, 1);
 236 }
 237
 238 static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
 239 {
 240         struct sh_tmu_channel *ch = dev_id;
 241
 242         /* disable or acknowledge interrupt */
 243         if (clockevent_state_oneshot(&ch->ced))
 244                 sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
 245         else
 246                 sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
 247
 248         /* notify clockevent layer */
 249         ch->ced.event_handler(&ch->ced);
 250         return IRQ_HANDLED;
 251 }
 252
 253 static struct sh_tmu_channel *cs_to_sh_tmu(struct clocksource *cs)
 254 {
 255         return container_of(cs, struct sh_tmu_channel, cs);
 256 }
 257
 258 static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
 259 {
 260         struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
 261
 262         return sh_tmu_read(ch, TCNT) ^ 0xffffffff;
 263 }
 264
 265 static int sh_tmu_clocksource_enable(struct clocksource *cs)
 266 {
 267         struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
 268         int ret;
 269
 270         if (WARN_ON(ch->cs_enabled))
 271                 return 0;
 272
 273         ret = sh_tmu_enable(ch);
 274         if (!ret) {
 275                 __clocksource_update_freq_hz(cs, ch->rate);
 276                 ch->cs_enabled = true;
 277         }
 278
 279         return ret;
 280 }
 281
 282 static void sh_tmu_clocksource_disable(struct clocksource *cs)
 283 {
 284         struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
 285
 286         if (WARN_ON(!ch->cs_enabled))
 287                 return;
 288
 289         sh_tmu_disable(ch);
 290         ch->cs_enabled = false;
 291 }
 292
 293 static void sh_tmu_clocksource_suspend(struct clocksource *cs)
 294 {
 295         struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
 296
 297         if (!ch->cs_enabled)
 298                 return;
 299
 300         if (--ch->enable_count == 0) {
 301                 __sh_tmu_disable(ch);
 302                 pm_genpd_syscore_poweroff(&ch->tmu->pdev->dev);
 303         }
 304 }
 305
 306 static void sh_tmu_clocksource_resume(struct clocksource *cs)
 307 {
 308         struct sh_tmu_channel *ch = cs_to_sh_tmu(cs);
 309
 310         if (!ch->cs_enabled)
 311                 return;
 312
 313         if (ch->enable_count++ == 0) {
 314                 pm_genpd_syscore_poweron(&ch->tmu->pdev->dev);
 315                 __sh_tmu_enable(ch);
 316         }
 317 }
 318
 319 static int sh_tmu_register_clocksource(struct sh_tmu_channel *ch,
 320                                        const char *name)
 321 {
 322         struct clocksource *cs = &ch->cs;
 323
 324         cs->name = name;
 325         cs->rating = 200;
 326         cs->read = sh_tmu_clocksource_read;
 327         cs->enable = sh_tmu_clocksource_enable;
 328         cs->disable = sh_tmu_clocksource_disable;
 329         cs->suspend = sh_tmu_clocksource_suspend;
 330         cs->resume = sh_tmu_clocksource_resume;
 331         cs->mask = CLOCKSOURCE_MASK(32);
 332         cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
 333
 334         dev_info(&ch->tmu->pdev->dev, "ch%u: used as clock source\n",
 335                  ch->index);
 336
 337         /* Register with dummy 1 Hz value, gets updated in ->enable() */
 338         clocksource_register_hz(cs, 1);
 339         return 0;
 340 }
 341
 342 static struct sh_tmu_channel *ced_to_sh_tmu(struct clock_event_device *ced)
 343 {
 344         return container_of(ced, struct sh_tmu_channel, ced);
 345 }
 346
 347 static void sh_tmu_clock_event_start(struct sh_tmu_channel *ch, int periodic)
 348 {
 349         struct clock_event_device *ced = &ch->ced;
 350
 351         sh_tmu_enable(ch);
 352
 353         clockevents_config(ced, ch->rate);
 354
 355         if (periodic) {
 356                 ch->periodic = (ch->rate + HZ/2) / HZ;
 357                 sh_tmu_set_next(ch, ch->periodic, 1);
 358         }
 359 }
 360
 361 static int sh_tmu_clock_event_shutdown(struct clock_event_device *ced)
 362 {
 363         struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
 364
 365         if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
 366                 sh_tmu_disable(ch);
 367         return 0;
 368 }
 369
 370 static int sh_tmu_clock_event_set_state(struct clock_event_device *ced,
 371                                         int periodic)
 372 {
 373         struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
 374
 375         /* deal with old setting first */
 376         if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
 377                 sh_tmu_disable(ch);
 378
 379         dev_info(&ch->tmu->pdev->dev, "ch%u: used for %s clock events\n",
 380                  ch->index, periodic ? "periodic" : "oneshot");
 381         sh_tmu_clock_event_start(ch, periodic);
 382         return 0;
 383 }
 384
 385 static int sh_tmu_clock_event_set_oneshot(struct clock_event_device *ced)
 386 {
 387         return sh_tmu_clock_event_set_state(ced, 0);
 388 }
 389
 390 static int sh_tmu_clock_event_set_periodic(struct clock_event_device *ced)
 391 {
 392         return sh_tmu_clock_event_set_state(ced, 1);
 393 }
 394
 395 static int sh_tmu_clock_event_next(unsigned long delta,
 396                                    struct clock_event_device *ced)
 397 {
 398         struct sh_tmu_channel *ch = ced_to_sh_tmu(ced);
 399
 400         BUG_ON(!clockevent_state_oneshot(ced));
 401
 402         /* program new delta value */
 403         sh_tmu_set_next(ch, delta, 0);
 404         return 0;
 405 }
 406
 407 static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
 408 {
 409         pm_genpd_syscore_poweroff(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
 410 }
 411
 412 static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
 413 {
 414         pm_genpd_syscore_poweron(&ced_to_sh_tmu(ced)->tmu->pdev->dev);
 415 }
 416
 417 static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch,
 418                                        const char *name)
 419 {
 420         struct clock_event_device *ced = &ch->ced;
 421         int ret;
 422
 423         ced->name = name;
 424         ced->features = CLOCK_EVT_FEAT_PERIODIC;
 425         ced->features |= CLOCK_EVT_FEAT_ONESHOT;
 426         ced->rating = 200;
 427         ced->cpumask = cpu_possible_mask;
 428         ced->set_next_event = sh_tmu_clock_event_next;
 429         ced->set_state_shutdown = sh_tmu_clock_event_shutdown;
 430         ced->set_state_periodic = sh_tmu_clock_event_set_periodic;
 431         ced->set_state_oneshot = sh_tmu_clock_event_set_oneshot;
 432         ced->suspend = sh_tmu_clock_event_suspend;
 433         ced->resume = sh_tmu_clock_event_resume;
 434
 435         dev_info(&ch->tmu->pdev->dev, "ch%u: used for clock events\n",
 436                  ch->index);
 437
 438         clockevents_config_and_register(ced, 1, 0x300, 0xffffffff);
 439
 440         ret = request_irq(ch->irq, sh_tmu_interrupt,
 441                           IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
 442                           dev_name(&ch->tmu->pdev->dev), ch);
 443         if (ret) {
 444                 dev_err(&ch->tmu->pdev->dev, "ch%u: failed to request irq %d\n",
 445                         ch->index, ch->irq);
 446                 return;
 447         }
 448 }
 449
 450 static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name,
 451                            bool clockevent, bool clocksource)
 452 {
 453         if (clockevent) {
 454                 ch->tmu->has_clockevent = true;
 455                 sh_tmu_register_clockevent(ch, name);
 456         } else if (clocksource) {
 457                 ch->tmu->has_clocksource = true;
 458                 sh_tmu_register_clocksource(ch, name);
 459         }
 460
 461         return 0;
 462 }
 463
 464 static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index,
 465                                 bool clockevent, bool clocksource,
 466                                 struct sh_tmu_device *tmu)
 467 {
 468         /* Skip unused channels. */
 469         if (!clockevent && !clocksource)
 470                 return 0;
 471
 472         ch->tmu = tmu;
 473         ch->index = index;
 474
 475         if (tmu->model == SH_TMU_SH3)
 476                 ch->base = tmu->mapbase + 4 + ch->index * 12;
 477         else
 478                 ch->base = tmu->mapbase + 8 + ch->index * 12;
 479
 480         ch->irq = platform_get_irq(tmu->pdev, index);
 481         if (ch->irq < 0) {
 482                 dev_err(&tmu->pdev->dev, "ch%u: failed to get irq\n",
 483                         ch->index);
 484                 return ch->irq;
 485         }
 486
 487         ch->cs_enabled = false;
 488         ch->enable_count = 0;
 489
 490         return sh_tmu_register(ch, dev_name(&tmu->pdev->dev),
 491                                clockevent, clocksource);
 492 }
 493
 494 static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
 495 {
 496         struct resource *res;
 497
 498         res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0);
 499         if (!res) {
 500                 dev_err(&tmu->pdev->dev, "failed to get I/O memory\n");
 501                 return -ENXIO;
 502         }
 503
 504         tmu->mapbase = ioremap_nocache(res->start, resource_size(res));
 505         if (tmu->mapbase == NULL)
 506                 return -ENXIO;
 507
 508         return 0;
 509 }
 510
 511 static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
 512 {
 513         struct device_node *np = tmu->pdev->dev.of_node;
 514
 515         tmu->model = SH_TMU;
 516         tmu->num_channels = 3;
 517
 518         of_property_read_u32(np, "#renesas,channels", &tmu->num_channels);
 519
 520         if (tmu->num_channels != 2 && tmu->num_channels != 3) {
 521                 dev_err(&tmu->pdev->dev, "invalid number of channels %u\n",
 522                         tmu->num_channels);
 523                 return -EINVAL;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
 530 {
 531         unsigned int i;
 532         int ret;
 533
 534         tmu->pdev = pdev;
 535
 536         raw_spin_lock_init(&tmu->lock);
 537
 538         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 539                 ret = sh_tmu_parse_dt(tmu);
 540                 if (ret < 0)
 541                         return ret;
 542         } else if (pdev->dev.platform_data) {
 543                 const struct platform_device_id *id = pdev->id_entry;
 544                 struct sh_timer_config *cfg = pdev->dev.platform_data;
 545
 546                 tmu->model = id->driver_data;
 547                 tmu->num_channels = hweight8(cfg->channels_mask);
 548         } else {
 549                 dev_err(&tmu->pdev->dev, "missing platform data\n");
 550                 return -ENXIO;
 551         }
 552
 553         /* Get hold of clock. */
 554         tmu->clk = clk_get(&tmu->pdev->dev, "fck");
 555         if (IS_ERR(tmu->clk)) {
 556                 dev_err(&tmu->pdev->dev, "cannot get clock\n");
 557                 return PTR_ERR(tmu->clk);
 558         }
 559
 560         ret = clk_prepare(tmu->clk);
 561         if (ret < 0)
 562                 goto err_clk_put;
 563
 564         /* Map the memory resource. */
 565         ret = sh_tmu_map_memory(tmu);
 566         if (ret < 0) {
 567                 dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n");
 568                 goto err_clk_unprepare;
 569         }
 570
 571         /* Allocate and setup the channels. */
 572         tmu->channels = kzalloc(sizeof(*tmu->channels) * tmu->num_channels,
 573                                 GFP_KERNEL);
 574         if (tmu->channels == NULL) {
 575                 ret = -ENOMEM;
 576                 goto err_unmap;
 577         }
 578
 579         /*
 580          * Use the first channel as a clock event device and the second channel
 581          * as a clock source.
 582          */
 583         for (i = 0; i < tmu->num_channels; ++i) {
 584                 ret = sh_tmu_channel_setup(&tmu->channels[i], i,
 585                                            i == 0, i == 1, tmu);
 586                 if (ret < 0)
 587                         goto err_unmap;
 588         }
 589
 590         platform_set_drvdata(pdev, tmu);
 591
 592         return 0;
 593
 594 err_unmap:
 595         kfree(tmu->channels);
 596         iounmap(tmu->mapbase);
 597 err_clk_unprepare:
 598         clk_unprepare(tmu->clk);
 599 err_clk_put:
 600         clk_put(tmu->clk);
 601         return ret;
 602 }
 603
 604 static int sh_tmu_probe(struct platform_device *pdev)
 605 {
 606         struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
 607         int ret;
 608
 609         if (!is_early_platform_device(pdev)) {
 610                 pm_runtime_set_active(&pdev->dev);
 611                 pm_runtime_enable(&pdev->dev);
 612         }
 613
 614         if (tmu) {
 615                 dev_info(&pdev->dev, "kept as earlytimer\n");
 616                 goto out;
 617         }
 618
 619         tmu = kzalloc(sizeof(*tmu), GFP_KERNEL);
 620         if (tmu == NULL)
 621                 return -ENOMEM;
 622
 623         ret = sh_tmu_setup(tmu, pdev);
 624         if (ret) {
 625                 kfree(tmu);
 626                 pm_runtime_idle(&pdev->dev);
 627                 return ret;
 628         }
 629         if (is_early_platform_device(pdev))
 630                 return 0;
 631
 632  out:
 633         if (tmu->has_clockevent || tmu->has_clocksource)
 634                 pm_runtime_irq_safe(&pdev->dev);
 635         else
 636                 pm_runtime_idle(&pdev->dev);
 637
 638         return 0;
 639 }
 640
 641 static int sh_tmu_remove(struct platform_device *pdev)
 642 {
 643         return -EBUSY; /* cannot unregister clockevent and clocksource */
 644 }
 645
 646 static const struct platform_device_id sh_tmu_id_table[] = {
 647         { "sh-tmu", SH_TMU },
 648         { "sh-tmu-sh3", SH_TMU_SH3 },
 649         { }
 650 };
 651 MODULE_DEVICE_TABLE(platform, sh_tmu_id_table);
 652
 653 static const struct of_device_id sh_tmu_of_table[] __maybe_unused = {
 654         { .compatible = "renesas,tmu" },
 655         { }
 656 };
 657 MODULE_DEVICE_TABLE(of, sh_tmu_of_table);
 658
 659 static struct platform_driver sh_tmu_device_driver = {
 660         .probe          = sh_tmu_probe,
 661         .remove         = sh_tmu_remove,
 662         .driver         = {
 663                 .name   = "sh_tmu",
 664                 .of_match_table = of_match_ptr(sh_tmu_of_table),
 665         },
 666         .id_table       = sh_tmu_id_table,
 667 };
 668
 669 static int __init sh_tmu_init(void)
 670 {
 671         return platform_driver_register(&sh_tmu_device_driver);
 672 }
 673
 674 static void __exit sh_tmu_exit(void)
 675 {
 676         platform_driver_unregister(&sh_tmu_device_driver);
 677 }
 678
 679 early_platform_init("earlytimer", &sh_tmu_device_driver);
 680 subsys_initcall(sh_tmu_init);
 681 module_exit(sh_tmu_exit);
 682
 683 MODULE_AUTHOR("Magnus Damm");
 684 MODULE_DESCRIPTION("SuperH TMU Timer Driver");
 685 MODULE_LICENSE("GPL v2");