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 enum s3c_cpu_type s3c_rtc_cpu_type;
  50
  51 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
  52
  53 /* IRQ Handlers */
  54
  55 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
  56 {
  57         struct rtc_device *rdev = id;
  58
  59         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
  60
  61         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  62                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
  63
  64         return IRQ_HANDLED;
  65 }
  66
  67 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
  68 {
  69         struct rtc_device *rdev = id;
  70
  71         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
  72
  73         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  74                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
  75
  76         return IRQ_HANDLED;
  77 }
  78
  79 /* Update control registers */
  80 static void s3c_rtc_setaie(int to)
  81 {
  82         unsigned int tmp;
  83
  84         pr_debug("%s: aie=%d\n", __func__, to);
  85
  86         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
  87
  88         if (to)
  89                 tmp |= S3C2410_RTCALM_ALMEN;
  90
  91         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
  92 }
  93
  94 static int s3c_rtc_setpie(struct device *dev, int enabled)
  95 {
  96         unsigned int tmp;
  97
  98         pr_debug("%s: pie=%d\n", __func__, enabled);
  99
 100         spin_lock_irq(&s3c_rtc_pie_lock);
 101
 102         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 103                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 104                 tmp &= ~S3C64XX_RTCCON_TICEN;
 105
 106                 if (enabled)
 107                         tmp |= S3C64XX_RTCCON_TICEN;
 108
 109                 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
 110         } else {
 111                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 112                 tmp &= ~S3C2410_TICNT_ENABLE;
 113
 114                 if (enabled)
 115                         tmp |= S3C2410_TICNT_ENABLE;
 116
 117                 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
 118         }
 119
 120         spin_unlock_irq(&s3c_rtc_pie_lock);
 121
 122         return 0;
 123 }
 124
 125 static int s3c_rtc_setfreq(struct device *dev, int freq)
 126 {
 127         struct platform_device *pdev = to_platform_device(dev);
 128         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 129         unsigned int tmp = 0;
 130
 131         if (!is_power_of_2(freq))
 132                 return -EINVAL;
 133
 134         spin_lock_irq(&s3c_rtc_pie_lock);
 135
 136         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 137                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 138                 tmp &= S3C2410_TICNT_ENABLE;
 139         }
 140
 141         tmp |= (rtc_dev->max_user_freq / freq)-1;
 142
 143         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 144         spin_unlock_irq(&s3c_rtc_pie_lock);
 145
 146         return 0;
 147 }
 148
 149 /* Time read/write */
 150
 151 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 152 {
 153         unsigned int have_retried = 0;
 154         void __iomem *base = s3c_rtc_base;
 155
 156  retry_get_time:
 157         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 158         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 159         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 160         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 161         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 162         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 163
 164         /* the only way to work out wether the system was mid-update
 165          * when we read it is to check the second counter, and if it
 166          * is zero, then we re-try the entire read
 167          */
 168
 169         if (rtc_tm->tm_sec == 0 && !have_retried) {
 170                 have_retried = 1;
 171                 goto retry_get_time;
 172         }
 173
 174         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
 175                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 176                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 177
 178         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 179         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 180         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 181         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 182         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 183         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 184
 185         rtc_tm->tm_year += 100;
 186         rtc_tm->tm_mon -= 1;
 187
 188         return rtc_valid_tm(rtc_tm);
 189 }
 190
 191 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 192 {
 193         void __iomem *base = s3c_rtc_base;
 194         int year = tm->tm_year - 100;
 195
 196         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 197                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 198                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 199
 200         /* we get around y2k by simply not supporting it */
 201
 202         if (year < 0 || year >= 100) {
 203                 dev_err(dev, "rtc only supports 100 years\n");
 204                 return -EINVAL;
 205         }
 206
 207         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 208         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 209         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
 210         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
 211         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
 212         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
 213
 214         return 0;
 215 }
 216
 217 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 218 {
 219         struct rtc_time *alm_tm = &alrm->time;
 220         void __iomem *base = s3c_rtc_base;
 221         unsigned int alm_en;
 222
 223         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 224         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 225         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 226         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 227         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 228         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 229
 230         alm_en = readb(base + S3C2410_RTCALM);
 231
 232         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 233
 234         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 235                  alm_en,
 236                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 237                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 238
 239
 240         /* decode the alarm enable field */
 241
 242         if (alm_en & S3C2410_RTCALM_SECEN)
 243                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 244         else
 245                 alm_tm->tm_sec = -1;
 246
 247         if (alm_en & S3C2410_RTCALM_MINEN)
 248                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 249         else
 250                 alm_tm->tm_min = -1;
 251
 252         if (alm_en & S3C2410_RTCALM_HOUREN)
 253                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 254         else
 255                 alm_tm->tm_hour = -1;
 256
 257         if (alm_en & S3C2410_RTCALM_DAYEN)
 258                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 259         else
 260                 alm_tm->tm_mday = -1;
 261
 262         if (alm_en & S3C2410_RTCALM_MONEN) {
 263                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 264                 alm_tm->tm_mon -= 1;
 265         } else {
 266                 alm_tm->tm_mon = -1;
 267         }
 268
 269         if (alm_en & S3C2410_RTCALM_YEAREN)
 270                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 271         else
 272                 alm_tm->tm_year = -1;
 273
 274         return 0;
 275 }
 276
 277 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 278 {
 279         struct rtc_time *tm = &alrm->time;
 280         void __iomem *base = s3c_rtc_base;
 281         unsigned int alrm_en;
 282
 283         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 284                  alrm->enabled,
 285                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 286                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 287
 288
 289         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 290         writeb(0x00, base + S3C2410_RTCALM);
 291
 292         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 293                 alrm_en |= S3C2410_RTCALM_SECEN;
 294                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
 295         }
 296
 297         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 298                 alrm_en |= S3C2410_RTCALM_MINEN;
 299                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
 300         }
 301
 302         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 303                 alrm_en |= S3C2410_RTCALM_HOUREN;
 304                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
 305         }
 306
 307         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 308
 309         writeb(alrm_en, base + S3C2410_RTCALM);
 310
 311         s3c_rtc_setaie(alrm->enabled);
 312
 313         return 0;
 314 }
 315
 316 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 317 {
 318         unsigned int ticnt;
 319
 320         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 321                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
 322                 ticnt &= S3C64XX_RTCCON_TICEN;
 323         } else {
 324                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 325                 ticnt &= S3C2410_TICNT_ENABLE;
 326         }
 327
 328         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 329         return 0;
 330 }
 331
 332 static int s3c_rtc_open(struct device *dev)
 333 {
 334         struct platform_device *pdev = to_platform_device(dev);
 335         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 336         int ret;
 337
 338         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 339                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);
 340
 341         if (ret) {
 342                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 343                 return ret;
 344         }
 345
 346         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 347                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);
 348
 349         if (ret) {
 350                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 351                 goto tick_err;
 352         }
 353
 354         return ret;
 355
 356  tick_err:
 357         free_irq(s3c_rtc_alarmno, rtc_dev);
 358         return ret;
 359 }
 360
 361 static void s3c_rtc_release(struct device *dev)
 362 {
 363         struct platform_device *pdev = to_platform_device(dev);
 364         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 365
 366         /* do not clear AIE here, it may be needed for wake */
 367
 368         s3c_rtc_setpie(dev, 0);
 369         free_irq(s3c_rtc_alarmno, rtc_dev);
 370         free_irq(s3c_rtc_tickno, rtc_dev);
 371 }
 372
 373 static const struct rtc_class_ops s3c_rtcops = {
 374         .open           = s3c_rtc_open,
 375         .release        = s3c_rtc_release,
 376         .read_time      = s3c_rtc_gettime,
 377         .set_time       = s3c_rtc_settime,
 378         .read_alarm     = s3c_rtc_getalarm,
 379         .set_alarm      = s3c_rtc_setalarm,
 380         .irq_set_freq   = s3c_rtc_setfreq,
 381         .irq_set_state  = s3c_rtc_setpie,
 382         .proc           = s3c_rtc_proc,
 383         .alarm_irq_enable = s3c_rtc_setaie,
 384 };
 385
 386 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 387 {
 388         void __iomem *base = s3c_rtc_base;
 389         unsigned int tmp;
 390
 391         if (s3c_rtc_base == NULL)
 392                 return;
 393
 394         if (!en) {
 395                 tmp = readw(base + S3C2410_RTCCON);
 396                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 397                         tmp &= ~S3C64XX_RTCCON_TICEN;
 398                 tmp &= ~S3C2410_RTCCON_RTCEN;
 399                 writew(tmp, base + S3C2410_RTCCON);
 400
 401                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 402                         tmp = readb(base + S3C2410_TICNT);
 403                         tmp &= ~S3C2410_TICNT_ENABLE;
 404                         writeb(tmp, base + S3C2410_TICNT);
 405                 }
 406         } else {
 407                 /* re-enable the device, and check it is ok */
 408
 409                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 410                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 411
 412                         tmp = readw(base + S3C2410_RTCCON);
 413                         writew(tmp | S3C2410_RTCCON_RTCEN,
 414                                 base + S3C2410_RTCCON);
 415                 }
 416
 417                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 418                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 419
 420                         tmp = readw(base + S3C2410_RTCCON);
 421                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 422                                 base + S3C2410_RTCCON);
 423                 }
 424
 425                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 426                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 427
 428                         tmp = readw(base + S3C2410_RTCCON);
 429                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 430                                 base + S3C2410_RTCCON);
 431                 }
 432         }
 433 }
 434
 435 static int __devexit s3c_rtc_remove(struct platform_device *dev)
 436 {
 437         struct rtc_device *rtc = platform_get_drvdata(dev);
 438
 439         platform_set_drvdata(dev, NULL);
 440         rtc_device_unregister(rtc);
 441
 442         s3c_rtc_setpie(&dev->dev, 0);
 443         s3c_rtc_setaie(0);
 444
 445         clk_disable(rtc_clk);
 446         clk_put(rtc_clk);
 447         rtc_clk = NULL;
 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 __devinit s3c_rtc_probe(struct platform_device *pdev)
 457 {
 458         struct rtc_device *rtc;
 459         struct rtc_time rtc_tm;
 460         struct resource *res;
 461         int ret;
 462
 463         pr_debug("%s: probe=%p\n", __func__, pdev);
 464
 465         /* find the IRQs */
 466
 467         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 468         if (s3c_rtc_tickno < 0) {
 469                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 470                 return -ENOENT;
 471         }
 472
 473         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 474         if (s3c_rtc_alarmno < 0) {
 475                 dev_err(&pdev->dev, "no irq for alarm\n");
 476                 return -ENOENT;
 477         }
 478
 479         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 480                  s3c_rtc_tickno, s3c_rtc_alarmno);
 481
 482         /* get the memory region */
 483
 484         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 485         if (res == NULL) {
 486                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 487                 return -ENOENT;
 488         }
 489
 490         s3c_rtc_mem = request_mem_region(res->start,
 491                                          res->end-res->start+1,
 492                                          pdev->name);
 493
 494         if (s3c_rtc_mem == NULL) {
 495                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 496                 ret = -ENOENT;
 497                 goto err_nores;
 498         }
 499
 500         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
 501         if (s3c_rtc_base == NULL) {
 502                 dev_err(&pdev->dev, "failed ioremap()\n");
 503                 ret = -EINVAL;
 504                 goto err_nomap;
 505         }
 506
 507         rtc_clk = clk_get(&pdev->dev, "rtc");
 508         if (IS_ERR(rtc_clk)) {
 509                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 510                 ret = PTR_ERR(rtc_clk);
 511                 rtc_clk = NULL;
 512                 goto err_clk;
 513         }
 514
 515         clk_enable(rtc_clk);
 516
 517         /* check to see if everything is setup correctly */
 518
 519         s3c_rtc_enable(pdev, 1);
 520
 521         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 522                  readw(s3c_rtc_base + S3C2410_RTCCON));
 523
 524         device_init_wakeup(&pdev->dev, 1);
 525
 526         /* register RTC and exit */
 527
 528         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 529                                   THIS_MODULE);
 530
 531         if (IS_ERR(rtc)) {
 532                 dev_err(&pdev->dev, "cannot attach rtc\n");
 533                 ret = PTR_ERR(rtc);
 534                 goto err_nortc;
 535         }
 536
 537         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
 538
 539         /* Check RTC Time */
 540
 541         s3c_rtc_gettime(NULL, &rtc_tm);
 542
 543         if (rtc_valid_tm(&rtc_tm)) {
 544                 rtc_tm.tm_year  = 100;
 545                 rtc_tm.tm_mon   = 0;
 546                 rtc_tm.tm_mday  = 1;
 547                 rtc_tm.tm_hour  = 0;
 548                 rtc_tm.tm_min   = 0;
 549                 rtc_tm.tm_sec   = 0;
 550
 551                 s3c_rtc_settime(NULL, &rtc_tm);
 552
 553                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 554         }
 555
 556         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 557                 rtc->max_user_freq = 32768;
 558         else
 559                 rtc->max_user_freq = 128;
 560
 561         platform_set_drvdata(pdev, rtc);
 562
 563         s3c_rtc_setfreq(&pdev->dev, 1);
 564
 565         return 0;
 566
 567  err_nortc:
 568         s3c_rtc_enable(pdev, 0);
 569         clk_disable(rtc_clk);
 570         clk_put(rtc_clk);
 571
 572  err_clk:
 573         iounmap(s3c_rtc_base);
 574
 575  err_nomap:
 576         release_resource(s3c_rtc_mem);
 577
 578  err_nores:
 579         return ret;
 580 }
 581
 582 #ifdef CONFIG_PM
 583
 584 /* RTC Power management control */
 585
 586 static int ticnt_save, ticnt_en_save;
 587
 588 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 589 {
 590         /* save TICNT for anyone using periodic interrupts */
 591         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 592         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 593                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
 594                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 595         }
 596         s3c_rtc_enable(pdev, 0);
 597
 598         if (device_may_wakeup(&pdev->dev))
 599                 enable_irq_wake(s3c_rtc_alarmno);
 600
 601         return 0;
 602 }
 603
 604 static int s3c_rtc_resume(struct platform_device *pdev)
 605 {
 606         unsigned int tmp;
 607
 608         s3c_rtc_enable(pdev, 1);
 609         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 610         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
 611                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 612                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
 613         }
 614
 615         if (device_may_wakeup(&pdev->dev))
 616                 disable_irq_wake(s3c_rtc_alarmno);
 617
 618         return 0;
 619 }
 620 #else
 621 #define s3c_rtc_suspend NULL
 622 #define s3c_rtc_resume  NULL
 623 #endif
 624
 625 static struct platform_device_id s3c_rtc_driver_ids[] = {
 626         {
 627                 .name           = "s3c2410-rtc",
 628                 .driver_data    = TYPE_S3C2410,
 629         }, {
 630                 .name           = "s3c64xx-rtc",
 631                 .driver_data    = TYPE_S3C64XX,
 632         },
 633         { }
 634 };
 635
 636 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 637
 638 static struct platform_driver s3c_rtc_driver = {
 639         .probe          = s3c_rtc_probe,
 640         .remove         = __devexit_p(s3c_rtc_remove),
 641         .suspend        = s3c_rtc_suspend,
 642         .resume         = s3c_rtc_resume,
 643         .id_table       = s3c_rtc_driver_ids,
 644         .driver         = {
 645                 .name   = "s3c-rtc",
 646                 .owner  = THIS_MODULE,
 647         },
 648 };
 649
 650 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
 651
 652 static int __init s3c_rtc_init(void)
 653 {
 654         printk(banner);
 655         return platform_driver_register(&s3c_rtc_driver);
 656 }
 657
 658 static void __exit s3c_rtc_exit(void)
 659 {
 660         platform_driver_unregister(&s3c_rtc_driver);
 661 }
 662
 663 module_init(s3c_rtc_init);
 664 module_exit(s3c_rtc_exit);
 665
 666 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 667 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 668 MODULE_LICENSE("GPL");
 669 MODULE_ALIAS("platform:s3c2410-rtc");