drivers/rtc/rtc-s3c.c

   1 /* drivers/rtc/rtc-s3c.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com/
   5  *
   6  * Copyright (c) 2004,2006 Simtec Electronics
   7  *      Ben Dooks, <ben@simtec.co.uk>
   8  *      http://armlinux.simtec.co.uk/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * S3C2410/S3C2440/S3C24XX Internal RTC Driver
  15 */
  16
  17 #include <linux/module.h>
  18 #include <linux/fs.h>
  19 #include <linux/string.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/rtc.h>
  24 #include <linux/bcd.h>
  25 #include <linux/clk.h>
  26 #include <linux/log2.h>
  27 #include <linux/slab.h>
  28
  29 #include <mach/hardware.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/io.h>
  32 #include <asm/irq.h>
  33 #include <plat/regs-rtc.h>
  34
  35 enum s3c_cpu_type {
  36         TYPE_S3C2410,
  37         TYPE_S3C64XX,
  38 };
  39
  40 /* I have yet to find an S3C implementation with more than one
  41  * of these rtc blocks in */
  42
  43 static struct resource *s3c_rtc_mem;
  44
  45 static struct clk *rtc_clk;
  46 static void __iomem *s3c_rtc_base;
  47 static int s3c_rtc_alarmno = NO_IRQ;
  48 static int s3c_rtc_tickno  = NO_IRQ;
  49 static bool wake_en;
  50 static enum s3c_cpu_type s3c_rtc_cpu_type;
  51
  52 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
  53
  54 /* IRQ Handlers */
  55
  56 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
  57 {
  58         struct rtc_device *rdev = id;
  59
  60         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
  61
  62         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  63                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
  64
  65         return IRQ_HANDLED;
  66 }
  67
  68 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
  69 {
  70         struct rtc_device *rdev = id;
  71
  72         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
  73
  74         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  75                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
  76
  77         return IRQ_HANDLED;
  78 }
  79
  80 /* Update control registers */
  81 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
  82 {
  83         unsigned int tmp;
  84
  85         pr_debug("%s: aie=%d\n", __func__, enabled);
  86
  87         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
  88
  89         if (enabled)
  90                 tmp |= S3C2410_RTCALM_ALMEN;
  91
  92         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
  93
  94         return 0;
  95 }
  96
  97 static int s3c_rtc_setfreq(struct device *dev, int freq)
  98 {
  99         struct platform_device *pdev = to_platform_device(dev);
 100         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 101         unsigned int tmp = 0;
 102
 103         if (!is_power_of_2(freq))
 104                 return -EINVAL;
 105
 106         spin_lock_irq(&s3c_rtc_pie_lock);
 107
 108         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 109                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 110                 tmp &= S3C2410_TICNT_ENABLE;
 111         }
 112
 113         tmp |= (rtc_dev->max_user_freq / freq)-1;
 114
 115         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 116         spin_unlock_irq(&s3c_rtc_pie_lock);
 117
 118         return 0;
 119 }
 120
 121 /* Time read/write */
 122
 123 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 124 {
 125         unsigned int have_retried = 0;
 126         void __iomem *base = s3c_rtc_base;
 127
 128  retry_get_time:
 129         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 130         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 131         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 132         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 133         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 134         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 135
 136         /* the only way to work out wether the system was mid-update
 137          * when we read it is to check the second counter, and if it
 138          * is zero, then we re-try the entire read
 139          */
 140
 141         if (rtc_tm->tm_sec == 0 && !have_retried) {
 142                 have_retried = 1;
 143                 goto retry_get_time;
 144         }
 145
 146         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
 147                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 148                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 149
 150         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 151         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 152         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 153         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 154         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 155         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 156
 157         rtc_tm->tm_year += 100;
 158         rtc_tm->tm_mon -= 1;
 159
 160         return rtc_valid_tm(rtc_tm);
 161 }
 162
 163 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 164 {
 165         void __iomem *base = s3c_rtc_base;
 166         int year = tm->tm_year - 100;
 167
 168         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 169                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 170                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 171
 172         /* we get around y2k by simply not supporting it */
 173
 174         if (year < 0 || year >= 100) {
 175                 dev_err(dev, "rtc only supports 100 years\n");
 176                 return -EINVAL;
 177         }
 178
 179         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 180         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 181         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
 182         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
 183         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
 184         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
 185
 186         return 0;
 187 }
 188
 189 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 190 {
 191         struct rtc_time *alm_tm = &alrm->time;
 192         void __iomem *base = s3c_rtc_base;
 193         unsigned int alm_en;
 194
 195         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 196         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 197         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 198         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 199         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 200         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 201
 202         alm_en = readb(base + S3C2410_RTCALM);
 203
 204         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 205
 206         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 207                  alm_en,
 208                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 209                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 210
 211
 212         /* decode the alarm enable field */
 213
 214         if (alm_en & S3C2410_RTCALM_SECEN)
 215                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 216         else
 217                 alm_tm->tm_sec = -1;
 218
 219         if (alm_en & S3C2410_RTCALM_MINEN)
 220                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 221         else
 222                 alm_tm->tm_min = -1;
 223
 224         if (alm_en & S3C2410_RTCALM_HOUREN)
 225                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 226         else
 227                 alm_tm->tm_hour = -1;
 228
 229         if (alm_en & S3C2410_RTCALM_DAYEN)
 230                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 231         else
 232                 alm_tm->tm_mday = -1;
 233
 234         if (alm_en & S3C2410_RTCALM_MONEN) {
 235                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 236                 alm_tm->tm_mon -= 1;
 237         } else {
 238                 alm_tm->tm_mon = -1;
 239         }
 240
 241         if (alm_en & S3C2410_RTCALM_YEAREN)
 242                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 243         else
 244                 alm_tm->tm_year = -1;
 245
 246         return 0;
 247 }
 248
 249 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 250 {
 251         struct rtc_time *tm = &alrm->time;
 252         void __iomem *base = s3c_rtc_base;
 253         unsigned int alrm_en;
 254
 255         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 256                  alrm->enabled,
 257                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 258                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 259
 260
 261         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 262         writeb(0x00, base + S3C2410_RTCALM);
 263
 264         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 265                 alrm_en |= S3C2410_RTCALM_SECEN;
 266                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
 267         }
 268
 269         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 270                 alrm_en |= S3C2410_RTCALM_MINEN;
 271                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
 272         }
 273
 274         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 275                 alrm_en |= S3C2410_RTCALM_HOUREN;
 276                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
 277         }
 278
 279         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 280
 281         writeb(alrm_en, base + S3C2410_RTCALM);
 282
 283         s3c_rtc_setaie(dev, alrm->enabled);
 284
 285         return 0;
 286 }
 287
 288 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 289 {
 290         unsigned int ticnt;
 291
 292         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 293                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
 294                 ticnt &= S3C64XX_RTCCON_TICEN;
 295         } else {
 296                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 297                 ticnt &= S3C2410_TICNT_ENABLE;
 298         }
 299
 300         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 301         return 0;
 302 }
 303
 304 static int s3c_rtc_open(struct device *dev)
 305 {
 306         struct platform_device *pdev = to_platform_device(dev);
 307         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 308         int ret;
 309
 310         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 311                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);
 312
 313         if (ret) {
 314                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 315                 return ret;
 316         }
 317
 318         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 319                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);
 320
 321         if (ret) {
 322                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 323                 goto tick_err;
 324         }
 325
 326         return ret;
 327
 328  tick_err:
 329         free_irq(s3c_rtc_alarmno, rtc_dev);
 330         return ret;
 331 }
 332
 333 static void s3c_rtc_release(struct device *dev)
 334 {
 335         struct platform_device *pdev = to_platform_device(dev);
 336         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 337
 338         /* do not clear AIE here, it may be needed for wake */
 339
 340         free_irq(s3c_rtc_alarmno, rtc_dev);
 341         free_irq(s3c_rtc_tickno, rtc_dev);
 342 }
 343
 344 static const struct rtc_class_ops s3c_rtcops = {
 345         .open           = s3c_rtc_open,
 346         .release        = s3c_rtc_release,
 347         .read_time      = s3c_rtc_gettime,
 348         .set_time       = s3c_rtc_settime,
 349         .read_alarm     = s3c_rtc_getalarm,
 350         .set_alarm      = s3c_rtc_setalarm,
 351         .proc           = s3c_rtc_proc,
 352         .alarm_irq_enable = s3c_rtc_setaie,
 353 };
 354
 355 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 356 {
 357         void __iomem *base = s3c_rtc_base;
 358         unsigned int tmp;
 359
 360         if (s3c_rtc_base == NULL)
 361                 return;
 362
 363         if (!en) {
 364                 tmp = readw(base + S3C2410_RTCCON);
 365                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 366                         tmp &= ~S3C64XX_RTCCON_TICEN;
 367                 tmp &= ~S3C2410_RTCCON_RTCEN;
 368                 writew(tmp, base + S3C2410_RTCCON);
 369
 370                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 371                         tmp = readb(base + S3C2410_TICNT);
 372                         tmp &= ~S3C2410_TICNT_ENABLE;
 373                         writeb(tmp, base + S3C2410_TICNT);
 374                 }
 375         } else {
 376                 /* re-enable the device, and check it is ok */
 377
 378                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 379                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 380
 381                         tmp = readw(base + S3C2410_RTCCON);
 382                         writew(tmp | S3C2410_RTCCON_RTCEN,
 383                                 base + S3C2410_RTCCON);
 384                 }
 385
 386                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 387                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 388
 389                         tmp = readw(base + S3C2410_RTCCON);
 390                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 391                                 base + S3C2410_RTCCON);
 392                 }
 393
 394                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 395                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 396
 397                         tmp = readw(base + S3C2410_RTCCON);
 398                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 399                                 base + S3C2410_RTCCON);
 400                 }
 401         }
 402 }
 403
 404 static int __devexit s3c_rtc_remove(struct platform_device *dev)
 405 {
 406         struct rtc_device *rtc = platform_get_drvdata(dev);
 407
 408         platform_set_drvdata(dev, NULL);
 409         rtc_device_unregister(rtc);
 410
 411         s3c_rtc_setaie(&dev->dev, 0);
 412
 413         clk_disable(rtc_clk);
 414         clk_put(rtc_clk);
 415         rtc_clk = NULL;
 416
 417         iounmap(s3c_rtc_base);
 418         release_resource(s3c_rtc_mem);
 419         kfree(s3c_rtc_mem);
 420
 421         return 0;
 422 }
 423
 424 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 425 {
 426         struct rtc_device *rtc;
 427         struct rtc_time rtc_tm;
 428         struct resource *res;
 429         int ret;
 430
 431         pr_debug("%s: probe=%p\n", __func__, pdev);
 432
 433         /* find the IRQs */
 434
 435         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 436         if (s3c_rtc_tickno < 0) {
 437                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 438                 return -ENOENT;
 439         }
 440
 441         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 442         if (s3c_rtc_alarmno < 0) {
 443                 dev_err(&pdev->dev, "no irq for alarm\n");
 444                 return -ENOENT;
 445         }
 446
 447         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 448                  s3c_rtc_tickno, s3c_rtc_alarmno);
 449
 450         /* get the memory region */
 451
 452         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 453         if (res == NULL) {
 454                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 455                 return -ENOENT;
 456         }
 457
 458         s3c_rtc_mem = request_mem_region(res->start,
 459                                          res->end-res->start+1,
 460                                          pdev->name);
 461
 462         if (s3c_rtc_mem == NULL) {
 463                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 464                 ret = -ENOENT;
 465                 goto err_nores;
 466         }
 467
 468         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
 469         if (s3c_rtc_base == NULL) {
 470                 dev_err(&pdev->dev, "failed ioremap()\n");
 471                 ret = -EINVAL;
 472                 goto err_nomap;
 473         }
 474
 475         rtc_clk = clk_get(&pdev->dev, "rtc");
 476         if (IS_ERR(rtc_clk)) {
 477                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 478                 ret = PTR_ERR(rtc_clk);
 479                 rtc_clk = NULL;
 480                 goto err_clk;
 481         }
 482
 483         clk_enable(rtc_clk);
 484
 485         /* check to see if everything is setup correctly */
 486
 487         s3c_rtc_enable(pdev, 1);
 488
 489         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 490                  readw(s3c_rtc_base + S3C2410_RTCCON));
 491
 492         device_init_wakeup(&pdev->dev, 1);
 493
 494         /* register RTC and exit */
 495
 496         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 497                                   THIS_MODULE);
 498
 499         if (IS_ERR(rtc)) {
 500                 dev_err(&pdev->dev, "cannot attach rtc\n");
 501                 ret = PTR_ERR(rtc);
 502                 goto err_nortc;
 503         }
 504
 505         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
 506
 507         /* Check RTC Time */
 508
 509         s3c_rtc_gettime(NULL, &rtc_tm);
 510
 511         if (rtc_valid_tm(&rtc_tm)) {
 512                 rtc_tm.tm_year  = 100;
 513                 rtc_tm.tm_mon   = 0;
 514                 rtc_tm.tm_mday  = 1;
 515                 rtc_tm.tm_hour  = 0;
 516                 rtc_tm.tm_min   = 0;
 517                 rtc_tm.tm_sec   = 0;
 518
 519                 s3c_rtc_settime(NULL, &rtc_tm);
 520
 521                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 522         }
 523
 524         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 525                 rtc->max_user_freq = 32768;
 526         else
 527                 rtc->max_user_freq = 128;
 528
 529         platform_set_drvdata(pdev, rtc);
 530
 531         s3c_rtc_setfreq(&pdev->dev, 1);
 532
 533         return 0;
 534
 535  err_nortc:
 536         s3c_rtc_enable(pdev, 0);
 537         clk_disable(rtc_clk);
 538         clk_put(rtc_clk);
 539
 540  err_clk:
 541         iounmap(s3c_rtc_base);
 542
 543  err_nomap:
 544         release_resource(s3c_rtc_mem);
 545
 546  err_nores:
 547         return ret;
 548 }
 549
 550 #ifdef CONFIG_PM
 551
 552 /* RTC Power management control */
 553
 554 static int ticnt_save, ticnt_en_save;
 555
 556 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 557 {
 558         /* save TICNT for anyone using periodic interrupts */
 559         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 560         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 561                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
 562                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 563         }
 564         s3c_rtc_enable(pdev, 0);
 565
 566         if (device_may_wakeup(&pdev->dev) && !wake_en) {
 567                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
 568                         wake_en = true;
 569                 else
 570                         dev_err(&pdev->dev, "enable_irq_wake failed\n");
 571         }
 572
 573         return 0;
 574 }
 575
 576 static int s3c_rtc_resume(struct platform_device *pdev)
 577 {
 578         unsigned int tmp;
 579
 580         s3c_rtc_enable(pdev, 1);
 581         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 582         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
 583                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 584                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
 585         }
 586
 587         if (device_may_wakeup(&pdev->dev) && wake_en) {
 588                 disable_irq_wake(s3c_rtc_alarmno);
 589                 wake_en = false;
 590         }
 591
 592         return 0;
 593 }
 594 #else
 595 #define s3c_rtc_suspend NULL
 596 #define s3c_rtc_resume  NULL
 597 #endif
 598
 599 static struct platform_device_id s3c_rtc_driver_ids[] = {
 600         {
 601                 .name           = "s3c2410-rtc",
 602                 .driver_data    = TYPE_S3C2410,
 603         }, {
 604                 .name           = "s3c64xx-rtc",
 605                 .driver_data    = TYPE_S3C64XX,
 606         },
 607         { }
 608 };
 609
 610 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 611
 612 static struct platform_driver s3c_rtc_driver = {
 613         .probe          = s3c_rtc_probe,
 614         .remove         = __devexit_p(s3c_rtc_remove),
 615         .suspend        = s3c_rtc_suspend,
 616         .resume         = s3c_rtc_resume,
 617         .id_table       = s3c_rtc_driver_ids,
 618         .driver         = {
 619                 .name   = "s3c-rtc",
 620                 .owner  = THIS_MODULE,
 621         },
 622 };
 623
 624 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
 625
 626 static int __init s3c_rtc_init(void)
 627 {
 628         printk(banner);
 629         return platform_driver_register(&s3c_rtc_driver);
 630 }
 631
 632 static void __exit s3c_rtc_exit(void)
 633 {
 634         platform_driver_unregister(&s3c_rtc_driver);
 635 }
 636
 637 module_init(s3c_rtc_init);
 638 module_exit(s3c_rtc_exit);
 639
 640 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 641 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 642 MODULE_LICENSE("GPL");
 643 MODULE_ALIAS("platform:s3c2410-rtc");