Pileus Git - ~andy/linux/blob - drivers/rtc/rtc-s3c.c

   1 /* drivers/rtc/rtc-s3c.c
   2  *
   3  * Copyright (c) 2004,2006 Simtec Electronics
   4  *      Ben Dooks, <ben@simtec.co.uk>
   5  *      http://armlinux.simtec.co.uk/
   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 version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * S3C2410/S3C2440/S3C24XX Internal RTC Driver
  12 */
  13
  14 #include <linux/module.h>
  15 #include <linux/fs.h>
  16 #include <linux/string.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/rtc.h>
  21 #include <linux/bcd.h>
  22 #include <linux/clk.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28 #include <asm/rtc.h>
  29
  30 #include <asm/mach/time.h>
  31
  32 #include <asm/arch/regs-rtc.h>
  33
  34 /* I have yet to find an S3C implementation with more than one
  35  * of these rtc blocks in */
  36
  37 static struct resource *s3c_rtc_mem;
  38
  39 static void __iomem *s3c_rtc_base;
  40 static int s3c_rtc_alarmno = NO_IRQ;
  41 static int s3c_rtc_tickno  = NO_IRQ;
  42 static int s3c_rtc_freq    = 1;
  43
  44 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
  45 static unsigned int tick_count;
  46
  47 /* IRQ Handlers */
  48
  49 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
  50 {
  51         struct rtc_device *rdev = id;
  52
  53         rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF);
  54         return IRQ_HANDLED;
  55 }
  56
  57 static irqreturn_t s3c_rtc_tickirq(int irq, void *id, struct pt_regs *r)
  58 {
  59         struct rtc_device *rdev = id;
  60
  61         rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF);
  62         return IRQ_HANDLED;
  63 }
  64
  65 /* Update control registers */
  66 static void s3c_rtc_setaie(int to)
  67 {
  68         unsigned int tmp;
  69
  70         pr_debug("%s: aie=%d\n", __FUNCTION__, to);
  71
  72         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
  73
  74         if (to)
  75                 tmp |= S3C2410_RTCALM_ALMEN;
  76
  77         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
  78 }
  79
  80 static void s3c_rtc_setpie(int to)
  81 {
  82         unsigned int tmp;
  83
  84         pr_debug("%s: pie=%d\n", __FUNCTION__, to);
  85
  86         spin_lock_irq(&s3c_rtc_pie_lock);
  87         tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
  88
  89         if (to)
  90                 tmp |= S3C2410_TICNT_ENABLE;
  91
  92         writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
  93         spin_unlock_irq(&s3c_rtc_pie_lock);
  94 }
  95
  96 static void s3c_rtc_setfreq(int freq)
  97 {
  98         unsigned int tmp;
  99
 100         spin_lock_irq(&s3c_rtc_pie_lock);
 101         tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
 102
 103         s3c_rtc_freq = freq;
 104
 105         tmp |= (128 / freq)-1;
 106
 107         writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
 108         spin_unlock_irq(&s3c_rtc_pie_lock);
 109 }
 110
 111 /* Time read/write */
 112
 113 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 114 {
 115         unsigned int have_retried = 0;
 116         void __iomem *base = s3c_rtc_base;
 117
 118  retry_get_time:
 119         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 120         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 121         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 122         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 123         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 124         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 125
 126         /* the only way to work out wether the system was mid-update
 127          * when we read it is to check the second counter, and if it
 128          * is zero, then we re-try the entire read
 129          */
 130
 131         if (rtc_tm->tm_sec == 0 && !have_retried) {
 132                 have_retried = 1;
 133                 goto retry_get_time;
 134         }
 135
 136         pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
 137                  rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 138                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 139
 140         BCD_TO_BIN(rtc_tm->tm_sec);
 141         BCD_TO_BIN(rtc_tm->tm_min);
 142         BCD_TO_BIN(rtc_tm->tm_hour);
 143         BCD_TO_BIN(rtc_tm->tm_mday);
 144         BCD_TO_BIN(rtc_tm->tm_mon);
 145         BCD_TO_BIN(rtc_tm->tm_year);
 146
 147         rtc_tm->tm_year += 100;
 148         rtc_tm->tm_mon -= 1;
 149
 150         return 0;
 151 }
 152
 153 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 154 {
 155         void __iomem *base = s3c_rtc_base;
 156
 157         /* the rtc gets round the y2k problem by just not supporting it */
 158
 159         if (tm->tm_year > 100) {
 160                 dev_err(dev, "rtc only supports 100 years\n");
 161                 return -EINVAL;
 162         }
 163
 164         pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
 165                  tm->tm_year, tm->tm_mon, tm->tm_mday,
 166                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 167
 168         writeb(BIN2BCD(tm->tm_sec),  base + S3C2410_RTCSEC);
 169         writeb(BIN2BCD(tm->tm_min),  base + S3C2410_RTCMIN);
 170         writeb(BIN2BCD(tm->tm_hour), base + S3C2410_RTCHOUR);
 171         writeb(BIN2BCD(tm->tm_mday), base + S3C2410_RTCDATE);
 172         writeb(BIN2BCD(tm->tm_mon + 1), base + S3C2410_RTCMON);
 173         writeb(BIN2BCD(tm->tm_year - 100), base + S3C2410_RTCYEAR);
 174
 175         return 0;
 176 }
 177
 178 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 179 {
 180         struct rtc_time *alm_tm = &alrm->time;
 181         void __iomem *base = s3c_rtc_base;
 182         unsigned int alm_en;
 183
 184         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 185         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 186         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 187         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 188         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 189         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 190
 191         alm_en = readb(base + S3C2410_RTCALM);
 192
 193         pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
 194                  alm_en,
 195                  alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 196                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 197
 198
 199         /* decode the alarm enable field */
 200
 201         if (alm_en & S3C2410_RTCALM_SECEN)
 202                 BCD_TO_BIN(alm_tm->tm_sec);
 203         else
 204                 alm_tm->tm_sec = 0xff;
 205
 206         if (alm_en & S3C2410_RTCALM_MINEN)
 207                 BCD_TO_BIN(alm_tm->tm_min);
 208         else
 209                 alm_tm->tm_min = 0xff;
 210
 211         if (alm_en & S3C2410_RTCALM_HOUREN)
 212                 BCD_TO_BIN(alm_tm->tm_hour);
 213         else
 214                 alm_tm->tm_hour = 0xff;
 215
 216         if (alm_en & S3C2410_RTCALM_DAYEN)
 217                 BCD_TO_BIN(alm_tm->tm_mday);
 218         else
 219                 alm_tm->tm_mday = 0xff;
 220
 221         if (alm_en & S3C2410_RTCALM_MONEN) {
 222                 BCD_TO_BIN(alm_tm->tm_mon);
 223                 alm_tm->tm_mon -= 1;
 224         } else {
 225                 alm_tm->tm_mon = 0xff;
 226         }
 227
 228         if (alm_en & S3C2410_RTCALM_YEAREN)
 229                 BCD_TO_BIN(alm_tm->tm_year);
 230         else
 231                 alm_tm->tm_year = 0xffff;
 232
 233         return 0;
 234 }
 235
 236 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 237 {
 238         struct rtc_time *tm = &alrm->time;
 239         void __iomem *base = s3c_rtc_base;
 240         unsigned int alrm_en;
 241
 242         pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
 243                  alrm->enabled,
 244                  tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
 245                  tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
 246
 247
 248         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 249         writeb(0x00, base + S3C2410_RTCALM);
 250
 251         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 252                 alrm_en |= S3C2410_RTCALM_SECEN;
 253                 writeb(BIN2BCD(tm->tm_sec), base + S3C2410_ALMSEC);
 254         }
 255
 256         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 257                 alrm_en |= S3C2410_RTCALM_MINEN;
 258                 writeb(BIN2BCD(tm->tm_min), base + S3C2410_ALMMIN);
 259         }
 260
 261         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 262                 alrm_en |= S3C2410_RTCALM_HOUREN;
 263                 writeb(BIN2BCD(tm->tm_hour), base + S3C2410_ALMHOUR);
 264         }
 265
 266         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 267
 268         writeb(alrm_en, base + S3C2410_RTCALM);
 269
 270         if (0) {
 271                 alrm_en = readb(base + S3C2410_RTCALM);
 272                 alrm_en &= ~S3C2410_RTCALM_ALMEN;
 273                 writeb(alrm_en, base + S3C2410_RTCALM);
 274                 disable_irq_wake(s3c_rtc_alarmno);
 275         }
 276
 277         if (alrm->enabled)
 278                 enable_irq_wake(s3c_rtc_alarmno);
 279         else
 280                 disable_irq_wake(s3c_rtc_alarmno);
 281
 282         return 0;
 283 }
 284
 285 static int s3c_rtc_ioctl(struct device *dev,
 286                          unsigned int cmd, unsigned long arg)
 287 {
 288         unsigned int ret = -ENOIOCTLCMD;
 289
 290         switch (cmd) {
 291         case RTC_AIE_OFF:
 292         case RTC_AIE_ON:
 293                 s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
 294                 ret = 0;
 295                 break;
 296
 297         case RTC_PIE_OFF:
 298         case RTC_PIE_ON:
 299                 tick_count = 0;
 300                 s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
 301                 ret = 0;
 302                 break;
 303
 304         case RTC_IRQP_READ:
 305                 ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg);
 306                 break;
 307
 308         case RTC_IRQP_SET:
 309                 /* check for power of 2 */
 310
 311                 if ((arg & (arg-1)) != 0 || arg < 1) {
 312                         ret = -EINVAL;
 313                         goto exit;
 314                 }
 315
 316                 pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
 317
 318                 s3c_rtc_setfreq(arg);
 319                 ret = 0;
 320                 break;
 321
 322         case RTC_UIE_ON:
 323         case RTC_UIE_OFF:
 324                 ret = -EINVAL;
 325         }
 326
 327  exit:
 328         return ret;
 329 }
 330
 331 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 332 {
 333         unsigned int rtcalm = readb(s3c_rtc_base + S3C2410_RTCALM);
 334         unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 335
 336         seq_printf(seq, "alarm_IRQ\t: %s\n",
 337                    (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
 338
 339         seq_printf(seq, "periodic_IRQ\t: %s\n",
 340                      (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
 341
 342         seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq);
 343
 344         return 0;
 345 }
 346
 347 static int s3c_rtc_open(struct device *dev)
 348 {
 349         struct platform_device *pdev = to_platform_device(dev);
 350         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 351         int ret;
 352
 353         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 354                           SA_INTERRUPT,  "s3c2410-rtc alarm", rtc_dev);
 355
 356         if (ret) {
 357                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 358                 return ret;
 359         }
 360
 361         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 362                           SA_INTERRUPT,  "s3c2410-rtc tick", rtc_dev);
 363
 364         if (ret) {
 365                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 366                 goto tick_err;
 367         }
 368
 369         return ret;
 370
 371  tick_err:
 372         free_irq(s3c_rtc_alarmno, rtc_dev);
 373         return ret;
 374 }
 375
 376 static void s3c_rtc_release(struct device *dev)
 377 {
 378         struct platform_device *pdev = to_platform_device(dev);
 379         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 380
 381         /* do not clear AIE here, it may be needed for wake */
 382
 383         s3c_rtc_setpie(0);
 384         free_irq(s3c_rtc_alarmno, rtc_dev);
 385         free_irq(s3c_rtc_tickno, rtc_dev);
 386 }
 387
 388 static struct rtc_class_ops s3c_rtcops = {
 389         .open           = s3c_rtc_open,
 390         .release        = s3c_rtc_release,
 391         .ioctl          = s3c_rtc_ioctl,
 392         .read_time      = s3c_rtc_gettime,
 393         .set_time       = s3c_rtc_settime,
 394         .read_alarm     = s3c_rtc_getalarm,
 395         .set_alarm      = s3c_rtc_setalarm,
 396         .proc           = s3c_rtc_proc,
 397 };
 398
 399 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 400 {
 401         void __iomem *base = s3c_rtc_base;
 402         unsigned int tmp;
 403
 404         if (s3c_rtc_base == NULL)
 405                 return;
 406
 407         if (!en) {
 408                 tmp = readb(base + S3C2410_RTCCON);
 409                 writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);
 410
 411                 tmp = readb(base + S3C2410_TICNT);
 412                 writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
 413         } else {
 414                 /* re-enable the device, and check it is ok */
 415
 416                 if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
 417                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 418
 419                         tmp = readb(base + S3C2410_RTCCON);
 420                         writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
 421                 }
 422
 423                 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
 424                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 425
 426                         tmp = readb(base + S3C2410_RTCCON);
 427                         writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
 428                 }
 429
 430                 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
 431                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 432
 433                         tmp = readb(base + S3C2410_RTCCON);
 434                         writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
 435                 }
 436         }
 437 }
 438
 439 static int s3c_rtc_remove(struct platform_device *dev)
 440 {
 441         struct rtc_device *rtc = platform_get_drvdata(dev);
 442
 443         platform_set_drvdata(dev, NULL);
 444         rtc_device_unregister(rtc);
 445
 446         s3c_rtc_setpie(0);
 447         s3c_rtc_setaie(0);
 448
 449         iounmap(s3c_rtc_base);
 450         release_resource(s3c_rtc_mem);
 451         kfree(s3c_rtc_mem);
 452
 453         return 0;
 454 }
 455
 456 static int s3c_rtc_probe(struct platform_device *pdev)
 457 {
 458         struct rtc_device *rtc;
 459         struct resource *res;
 460         int ret;
 461
 462         pr_debug("%s: probe=%p\n", __FUNCTION__, pdev);
 463
 464         /* find the IRQs */
 465
 466         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 467         if (s3c_rtc_tickno < 0) {
 468                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 469                 return -ENOENT;
 470         }
 471
 472         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 473         if (s3c_rtc_alarmno < 0) {
 474                 dev_err(&pdev->dev, "no irq for alarm\n");
 475                 return -ENOENT;
 476         }
 477
 478         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 479                  s3c_rtc_tickno, s3c_rtc_alarmno);
 480
 481         /* get the memory region */
 482
 483         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 484         if (res == NULL) {
 485                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 486                 return -ENOENT;
 487         }
 488
 489         s3c_rtc_mem = request_mem_region(res->start,
 490                                          res->end-res->start+1,
 491                                          pdev->name);
 492
 493         if (s3c_rtc_mem == NULL) {
 494                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 495                 ret = -ENOENT;
 496                 goto err_nores;
 497         }
 498
 499         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
 500         if (s3c_rtc_base == NULL) {
 501                 dev_err(&pdev->dev, "failed ioremap()\n");
 502                 ret = -EINVAL;
 503                 goto err_nomap;
 504         }
 505
 506         /* check to see if everything is setup correctly */
 507
 508         s3c_rtc_enable(pdev, 1);
 509
 510         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 511                  readb(s3c_rtc_base + S3C2410_RTCCON));
 512
 513         s3c_rtc_setfreq(s3c_rtc_freq);
 514
 515         /* register RTC and exit */
 516
 517         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 518                                   THIS_MODULE);
 519
 520         if (IS_ERR(rtc)) {
 521                 dev_err(&pdev->dev, "cannot attach rtc\n");
 522                 ret = PTR_ERR(rtc);
 523                 goto err_nortc;
 524         }
 525
 526         rtc->max_user_freq = 128;
 527
 528         platform_set_drvdata(pdev, rtc);
 529         return 0;
 530
 531  err_nortc:
 532         s3c_rtc_enable(pdev, 0);
 533         iounmap(s3c_rtc_base);
 534
 535  err_nomap:
 536         release_resource(s3c_rtc_mem);
 537
 538  err_nores:
 539         return ret;
 540 }
 541
 542 #ifdef CONFIG_PM
 543
 544 /* RTC Power management control */
 545
 546 static struct timespec s3c_rtc_delta;
 547
 548 static int ticnt_save;
 549
 550 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 551 {
 552         struct rtc_time tm;
 553         struct timespec time;
 554
 555         time.tv_nsec = 0;
 556
 557         /* save TICNT for anyone using periodic interrupts */
 558
 559         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 560
 561         /* calculate time delta for suspend */
 562
 563         s3c_rtc_gettime(&pdev->dev, &tm);
 564         rtc_tm_to_time(&tm, &time.tv_sec);
 565         save_time_delta(&s3c_rtc_delta, &time);
 566         s3c_rtc_enable(pdev, 0);
 567
 568         return 0;
 569 }
 570
 571 static int s3c_rtc_resume(struct platform_device *pdev)
 572 {
 573         struct rtc_time tm;
 574         struct timespec time;
 575
 576         time.tv_nsec = 0;
 577
 578         s3c_rtc_enable(pdev, 1);
 579         s3c_rtc_gettime(&pdev->dev, &tm);
 580         rtc_tm_to_time(&tm, &time.tv_sec);
 581         restore_time_delta(&s3c_rtc_delta, &time);
 582
 583         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 584         return 0;
 585 }
 586 #else
 587 #define s3c_rtc_suspend NULL
 588 #define s3c_rtc_resume  NULL
 589 #endif
 590
 591 static struct platform_driver s3c2410_rtcdrv = {
 592         .probe          = s3c_rtc_probe,
 593         .remove         = s3c_rtc_remove,
 594         .suspend        = s3c_rtc_suspend,
 595         .resume         = s3c_rtc_resume,
 596         .driver         = {
 597                 .name   = "s3c2410-rtc",
 598                 .owner  = THIS_MODULE,
 599         },
 600 };
 601
 602 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
 603
 604 static int __init s3c_rtc_init(void)
 605 {
 606         printk(banner);
 607         return platform_driver_register(&s3c2410_rtcdrv);
 608 }
 609
 610 static void __exit s3c_rtc_exit(void)
 611 {
 612         platform_driver_unregister(&s3c2410_rtcdrv);
 613 }
 614
 615 module_init(s3c_rtc_init);
 616 module_exit(s3c_rtc_exit);
 617
 618 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 619 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 620 MODULE_LICENSE("GPL");