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 static void s3c_rtc_alarm_clk_enable(bool enable)
  55 {
  56         static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
  57         static bool alarm_clk_enabled;
  58         unsigned long irq_flags;
  59
  60         spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
  61         if (enable) {
  62                 if (!alarm_clk_enabled) {
  63                         clk_enable(rtc_clk);
  64                         alarm_clk_enabled = true;
  65                 }
  66         } else {
  67                 if (alarm_clk_enabled) {
  68                         clk_disable(rtc_clk);
  69                         alarm_clk_enabled = false;
  70                 }
  71         }
  72         spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
  73 }
  74
  75 /* IRQ Handlers */
  76
  77 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
  78 {
  79         struct rtc_device *rdev = id;
  80
  81         clk_enable(rtc_clk);
  82         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
  83
  84         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  85                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
  86
  87         clk_disable(rtc_clk);
  88
  89         s3c_rtc_alarm_clk_enable(false);
  90
  91         return IRQ_HANDLED;
  92 }
  93
  94 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
  95 {
  96         struct rtc_device *rdev = id;
  97
  98         clk_enable(rtc_clk);
  99         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
 100
 101         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 102                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
 103
 104         clk_disable(rtc_clk);
 105         return IRQ_HANDLED;
 106 }
 107
 108 /* Update control registers */
 109 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 110 {
 111         unsigned int tmp;
 112
 113         pr_debug("%s: aie=%d\n", __func__, enabled);
 114
 115         clk_enable(rtc_clk);
 116         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 117
 118         if (enabled)
 119                 tmp |= S3C2410_RTCALM_ALMEN;
 120
 121         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
 122         clk_disable(rtc_clk);
 123
 124         s3c_rtc_alarm_clk_enable(enabled);
 125
 126         return 0;
 127 }
 128
 129 static int s3c_rtc_setfreq(struct device *dev, int freq)
 130 {
 131         struct platform_device *pdev = to_platform_device(dev);
 132         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 133         unsigned int tmp = 0;
 134
 135         if (!is_power_of_2(freq))
 136                 return -EINVAL;
 137
 138         clk_enable(rtc_clk);
 139         spin_lock_irq(&s3c_rtc_pie_lock);
 140
 141         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 142                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 143                 tmp &= S3C2410_TICNT_ENABLE;
 144         }
 145
 146         tmp |= (rtc_dev->max_user_freq / freq)-1;
 147
 148         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 149         spin_unlock_irq(&s3c_rtc_pie_lock);
 150         clk_disable(rtc_clk);
 151
 152         return 0;
 153 }
 154
 155 /* Time read/write */
 156
 157 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 158 {
 159         unsigned int have_retried = 0;
 160         void __iomem *base = s3c_rtc_base;
 161
 162         clk_enable(rtc_clk);
 163  retry_get_time:
 164         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 165         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 166         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 167         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 168         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 169         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 170
 171         /* the only way to work out wether the system was mid-update
 172          * when we read it is to check the second counter, and if it
 173          * is zero, then we re-try the entire read
 174          */
 175
 176         if (rtc_tm->tm_sec == 0 && !have_retried) {
 177                 have_retried = 1;
 178                 goto retry_get_time;
 179         }
 180
 181         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 182         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 183         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 184         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 185         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 186         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 187
 188         rtc_tm->tm_year += 100;
 189
 190         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
 191                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 192                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 193
 194         rtc_tm->tm_mon -= 1;
 195
 196         clk_disable(rtc_clk);
 197         return rtc_valid_tm(rtc_tm);
 198 }
 199
 200 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 201 {
 202         void __iomem *base = s3c_rtc_base;
 203         int year = tm->tm_year - 100;
 204
 205         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 206                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 207                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 208
 209         /* we get around y2k by simply not supporting it */
 210
 211         if (year < 0 || year >= 100) {
 212                 dev_err(dev, "rtc only supports 100 years\n");
 213                 return -EINVAL;
 214         }
 215
 216         clk_enable(rtc_clk);
 217         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 218         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 219         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
 220         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
 221         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
 222         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
 223         clk_disable(rtc_clk);
 224
 225         return 0;
 226 }
 227
 228 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 229 {
 230         struct rtc_time *alm_tm = &alrm->time;
 231         void __iomem *base = s3c_rtc_base;
 232         unsigned int alm_en;
 233
 234         clk_enable(rtc_clk);
 235         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 236         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 237         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 238         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 239         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 240         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 241
 242         alm_en = readb(base + S3C2410_RTCALM);
 243
 244         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 245
 246         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 247                  alm_en,
 248                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 249                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 250
 251
 252         /* decode the alarm enable field */
 253
 254         if (alm_en & S3C2410_RTCALM_SECEN)
 255                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 256         else
 257                 alm_tm->tm_sec = -1;
 258
 259         if (alm_en & S3C2410_RTCALM_MINEN)
 260                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 261         else
 262                 alm_tm->tm_min = -1;
 263
 264         if (alm_en & S3C2410_RTCALM_HOUREN)
 265                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 266         else
 267                 alm_tm->tm_hour = -1;
 268
 269         if (alm_en & S3C2410_RTCALM_DAYEN)
 270                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 271         else
 272                 alm_tm->tm_mday = -1;
 273
 274         if (alm_en & S3C2410_RTCALM_MONEN) {
 275                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 276                 alm_tm->tm_mon -= 1;
 277         } else {
 278                 alm_tm->tm_mon = -1;
 279         }
 280
 281         if (alm_en & S3C2410_RTCALM_YEAREN)
 282                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 283         else
 284                 alm_tm->tm_year = -1;
 285
 286         clk_disable(rtc_clk);
 287         return 0;
 288 }
 289
 290 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 291 {
 292         struct rtc_time *tm = &alrm->time;
 293         void __iomem *base = s3c_rtc_base;
 294         unsigned int alrm_en;
 295
 296         clk_enable(rtc_clk);
 297         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 298                  alrm->enabled,
 299                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 300                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 301
 302         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 303         writeb(0x00, base + S3C2410_RTCALM);
 304
 305         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 306                 alrm_en |= S3C2410_RTCALM_SECEN;
 307                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
 308         }
 309
 310         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 311                 alrm_en |= S3C2410_RTCALM_MINEN;
 312                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
 313         }
 314
 315         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 316                 alrm_en |= S3C2410_RTCALM_HOUREN;
 317                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
 318         }
 319
 320         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 321
 322         writeb(alrm_en, base + S3C2410_RTCALM);
 323
 324         s3c_rtc_setaie(dev, alrm->enabled);
 325
 326         clk_disable(rtc_clk);
 327         return 0;
 328 }
 329
 330 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 331 {
 332         unsigned int ticnt;
 333
 334         clk_enable(rtc_clk);
 335         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 336                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
 337                 ticnt &= S3C64XX_RTCCON_TICEN;
 338         } else {
 339                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 340                 ticnt &= S3C2410_TICNT_ENABLE;
 341         }
 342
 343         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 344         clk_disable(rtc_clk);
 345         return 0;
 346 }
 347
 348 static const struct rtc_class_ops s3c_rtcops = {
 349         .read_time      = s3c_rtc_gettime,
 350         .set_time       = s3c_rtc_settime,
 351         .read_alarm     = s3c_rtc_getalarm,
 352         .set_alarm      = s3c_rtc_setalarm,
 353         .proc           = s3c_rtc_proc,
 354         .alarm_irq_enable = s3c_rtc_setaie,
 355 };
 356
 357 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 358 {
 359         void __iomem *base = s3c_rtc_base;
 360         unsigned int tmp;
 361
 362         if (s3c_rtc_base == NULL)
 363                 return;
 364
 365         clk_enable(rtc_clk);
 366         if (!en) {
 367                 tmp = readw(base + S3C2410_RTCCON);
 368                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 369                         tmp &= ~S3C64XX_RTCCON_TICEN;
 370                 tmp &= ~S3C2410_RTCCON_RTCEN;
 371                 writew(tmp, base + S3C2410_RTCCON);
 372
 373                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 374                         tmp = readb(base + S3C2410_TICNT);
 375                         tmp &= ~S3C2410_TICNT_ENABLE;
 376                         writeb(tmp, base + S3C2410_TICNT);
 377                 }
 378         } else {
 379                 /* re-enable the device, and check it is ok */
 380
 381                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 382                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 383
 384                         tmp = readw(base + S3C2410_RTCCON);
 385                         writew(tmp | S3C2410_RTCCON_RTCEN,
 386                                 base + S3C2410_RTCCON);
 387                 }
 388
 389                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 390                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 391
 392                         tmp = readw(base + S3C2410_RTCCON);
 393                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 394                                 base + S3C2410_RTCCON);
 395                 }
 396
 397                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 398                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 399
 400                         tmp = readw(base + S3C2410_RTCCON);
 401                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 402                                 base + S3C2410_RTCCON);
 403                 }
 404         }
 405         clk_disable(rtc_clk);
 406 }
 407
 408 static int __devexit s3c_rtc_remove(struct platform_device *dev)
 409 {
 410         struct rtc_device *rtc = platform_get_drvdata(dev);
 411
 412         free_irq(s3c_rtc_alarmno, rtc);
 413         free_irq(s3c_rtc_tickno, rtc);
 414
 415         platform_set_drvdata(dev, NULL);
 416         rtc_device_unregister(rtc);
 417
 418         s3c_rtc_setaie(&dev->dev, 0);
 419
 420         clk_put(rtc_clk);
 421         rtc_clk = NULL;
 422
 423         iounmap(s3c_rtc_base);
 424         release_resource(s3c_rtc_mem);
 425         kfree(s3c_rtc_mem);
 426
 427         return 0;
 428 }
 429
 430 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 431 {
 432         struct rtc_device *rtc;
 433         struct rtc_time rtc_tm;
 434         struct resource *res;
 435         int ret;
 436
 437         pr_debug("%s: probe=%p\n", __func__, pdev);
 438
 439         /* find the IRQs */
 440
 441         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 442         if (s3c_rtc_tickno < 0) {
 443                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 444                 return -ENOENT;
 445         }
 446
 447         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 448         if (s3c_rtc_alarmno < 0) {
 449                 dev_err(&pdev->dev, "no irq for alarm\n");
 450                 return -ENOENT;
 451         }
 452
 453         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 454                  s3c_rtc_tickno, s3c_rtc_alarmno);
 455
 456         /* get the memory region */
 457
 458         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 459         if (res == NULL) {
 460                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 461                 return -ENOENT;
 462         }
 463
 464         s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
 465                                          pdev->name);
 466
 467         if (s3c_rtc_mem == NULL) {
 468                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 469                 ret = -ENOENT;
 470                 goto err_nores;
 471         }
 472
 473         s3c_rtc_base = ioremap(res->start, resource_size(res));
 474         if (s3c_rtc_base == NULL) {
 475                 dev_err(&pdev->dev, "failed ioremap()\n");
 476                 ret = -EINVAL;
 477                 goto err_nomap;
 478         }
 479
 480         rtc_clk = clk_get(&pdev->dev, "rtc");
 481         if (IS_ERR(rtc_clk)) {
 482                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 483                 ret = PTR_ERR(rtc_clk);
 484                 rtc_clk = NULL;
 485                 goto err_clk;
 486         }
 487
 488         clk_enable(rtc_clk);
 489
 490         /* check to see if everything is setup correctly */
 491
 492         s3c_rtc_enable(pdev, 1);
 493
 494         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 495                  readw(s3c_rtc_base + S3C2410_RTCCON));
 496
 497         device_init_wakeup(&pdev->dev, 1);
 498
 499         /* register RTC and exit */
 500
 501         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 502                                   THIS_MODULE);
 503
 504         if (IS_ERR(rtc)) {
 505                 dev_err(&pdev->dev, "cannot attach rtc\n");
 506                 ret = PTR_ERR(rtc);
 507                 goto err_nortc;
 508         }
 509
 510         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
 511
 512         /* Check RTC Time */
 513
 514         s3c_rtc_gettime(NULL, &rtc_tm);
 515
 516         if (rtc_valid_tm(&rtc_tm)) {
 517                 rtc_tm.tm_year  = 100;
 518                 rtc_tm.tm_mon   = 0;
 519                 rtc_tm.tm_mday  = 1;
 520                 rtc_tm.tm_hour  = 0;
 521                 rtc_tm.tm_min   = 0;
 522                 rtc_tm.tm_sec   = 0;
 523
 524                 s3c_rtc_settime(NULL, &rtc_tm);
 525
 526                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 527         }
 528
 529         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 530                 rtc->max_user_freq = 32768;
 531         else
 532                 rtc->max_user_freq = 128;
 533
 534         platform_set_drvdata(pdev, rtc);
 535
 536         s3c_rtc_setfreq(&pdev->dev, 1);
 537
 538         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 539                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc);
 540         if (ret) {
 541                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 542                 goto err_alarm_irq;
 543         }
 544
 545         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 546                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc);
 547         if (ret) {
 548                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 549                 free_irq(s3c_rtc_alarmno, rtc);
 550                 goto err_tick_irq;
 551         }
 552
 553         clk_disable(rtc_clk);
 554
 555         return 0;
 556
 557  err_tick_irq:
 558         free_irq(s3c_rtc_alarmno, rtc);
 559
 560  err_alarm_irq:
 561         platform_set_drvdata(pdev, NULL);
 562         rtc_device_unregister(rtc);
 563
 564  err_nortc:
 565         s3c_rtc_enable(pdev, 0);
 566         clk_disable(rtc_clk);
 567         clk_put(rtc_clk);
 568
 569  err_clk:
 570         iounmap(s3c_rtc_base);
 571
 572  err_nomap:
 573         release_resource(s3c_rtc_mem);
 574
 575  err_nores:
 576         return ret;
 577 }
 578
 579 #ifdef CONFIG_PM
 580
 581 /* RTC Power management control */
 582
 583 static int ticnt_save, ticnt_en_save;
 584
 585 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 586 {
 587         clk_enable(rtc_clk);
 588         /* save TICNT for anyone using periodic interrupts */
 589         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 590         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 591                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
 592                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 593         }
 594         s3c_rtc_enable(pdev, 0);
 595
 596         if (device_may_wakeup(&pdev->dev) && !wake_en) {
 597                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
 598                         wake_en = true;
 599                 else
 600                         dev_err(&pdev->dev, "enable_irq_wake failed\n");
 601         }
 602         clk_disable(rtc_clk);
 603
 604         return 0;
 605 }
 606
 607 static int s3c_rtc_resume(struct platform_device *pdev)
 608 {
 609         unsigned int tmp;
 610
 611         clk_enable(rtc_clk);
 612         s3c_rtc_enable(pdev, 1);
 613         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 614         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
 615                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 616                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
 617         }
 618
 619         if (device_may_wakeup(&pdev->dev) && wake_en) {
 620                 disable_irq_wake(s3c_rtc_alarmno);
 621                 wake_en = false;
 622         }
 623         clk_disable(rtc_clk);
 624
 625         return 0;
 626 }
 627 #else
 628 #define s3c_rtc_suspend NULL
 629 #define s3c_rtc_resume  NULL
 630 #endif
 631
 632 static struct platform_device_id s3c_rtc_driver_ids[] = {
 633         {
 634                 .name           = "s3c2410-rtc",
 635                 .driver_data    = TYPE_S3C2410,
 636         }, {
 637                 .name           = "s3c64xx-rtc",
 638                 .driver_data    = TYPE_S3C64XX,
 639         },
 640         { }
 641 };
 642
 643 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 644
 645 static struct platform_driver s3c_rtc_driver = {
 646         .probe          = s3c_rtc_probe,
 647         .remove         = __devexit_p(s3c_rtc_remove),
 648         .suspend        = s3c_rtc_suspend,
 649         .resume         = s3c_rtc_resume,
 650         .id_table       = s3c_rtc_driver_ids,
 651         .driver         = {
 652                 .name   = "s3c-rtc",
 653                 .owner  = THIS_MODULE,
 654         },
 655 };
 656
 657 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
 658
 659 static int __init s3c_rtc_init(void)
 660 {
 661         printk(banner);
 662         return platform_driver_register(&s3c_rtc_driver);
 663 }
 664
 665 static void __exit s3c_rtc_exit(void)
 666 {
 667         platform_driver_unregister(&s3c_rtc_driver);
 668 }
 669
 670 module_init(s3c_rtc_init);
 671 module_exit(s3c_rtc_exit);
 672
 673 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 674 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 675 MODULE_LICENSE("GPL");
 676 MODULE_ALIAS("platform:s3c2410-rtc");