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 int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
  81 {
  82         unsigned int tmp;
  83
  84         pr_debug("%s: aie=%d\n", __func__, enabled);
  85
  86         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
  87
  88         if (enabled)
  89                 tmp |= S3C2410_RTCALM_ALMEN;
  90
  91         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
  92
  93         return 0;
  94 }
  95
  96 static int s3c_rtc_setpie(struct device *dev, int enabled)
  97 {
  98         unsigned int tmp;
  99
 100         pr_debug("%s: pie=%d\n", __func__, enabled);
 101
 102         spin_lock_irq(&s3c_rtc_pie_lock);
 103
 104         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 105                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 106                 tmp &= ~S3C64XX_RTCCON_TICEN;
 107
 108                 if (enabled)
 109                         tmp |= S3C64XX_RTCCON_TICEN;
 110
 111                 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
 112         } else {
 113                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 114                 tmp &= ~S3C2410_TICNT_ENABLE;
 115
 116                 if (enabled)
 117                         tmp |= S3C2410_TICNT_ENABLE;
 118
 119                 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
 120         }
 121
 122         spin_unlock_irq(&s3c_rtc_pie_lock);
 123
 124         return 0;
 125 }
 126
 127 static int s3c_rtc_setfreq(struct device *dev, int freq)
 128 {
 129         struct platform_device *pdev = to_platform_device(dev);
 130         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 131         unsigned int tmp = 0;
 132
 133         if (!is_power_of_2(freq))
 134                 return -EINVAL;
 135
 136         spin_lock_irq(&s3c_rtc_pie_lock);
 137
 138         if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 139                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 140                 tmp &= S3C2410_TICNT_ENABLE;
 141         }
 142
 143         tmp |= (rtc_dev->max_user_freq / freq)-1;
 144
 145         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 146         spin_unlock_irq(&s3c_rtc_pie_lock);
 147
 148         return 0;
 149 }
 150
 151 /* Time read/write */
 152
 153 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 154 {
 155         unsigned int have_retried = 0;
 156         void __iomem *base = s3c_rtc_base;
 157
 158  retry_get_time:
 159         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 160         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 161         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 162         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 163         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 164         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 165
 166         /* the only way to work out wether the system was mid-update
 167          * when we read it is to check the second counter, and if it
 168          * is zero, then we re-try the entire read
 169          */
 170
 171         if (rtc_tm->tm_sec == 0 && !have_retried) {
 172                 have_retried = 1;
 173                 goto retry_get_time;
 174         }
 175
 176         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
 177                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 178                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 179
 180         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 181         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 182         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 183         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 184         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 185         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 186
 187         rtc_tm->tm_year += 100;
 188         rtc_tm->tm_mon -= 1;
 189
 190         return rtc_valid_tm(rtc_tm);
 191 }
 192
 193 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 194 {
 195         void __iomem *base = s3c_rtc_base;
 196         int year = tm->tm_year - 100;
 197
 198         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 199                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 200                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 201
 202         /* we get around y2k by simply not supporting it */
 203
 204         if (year < 0 || year >= 100) {
 205                 dev_err(dev, "rtc only supports 100 years\n");
 206                 return -EINVAL;
 207         }
 208
 209         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 210         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 211         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
 212         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
 213         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
 214         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
 215
 216         return 0;
 217 }
 218
 219 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 220 {
 221         struct rtc_time *alm_tm = &alrm->time;
 222         void __iomem *base = s3c_rtc_base;
 223         unsigned int alm_en;
 224
 225         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 226         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 227         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 228         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 229         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 230         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 231
 232         alm_en = readb(base + S3C2410_RTCALM);
 233
 234         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 235
 236         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 237                  alm_en,
 238                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 239                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 240
 241
 242         /* decode the alarm enable field */
 243
 244         if (alm_en & S3C2410_RTCALM_SECEN)
 245                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 246         else
 247                 alm_tm->tm_sec = -1;
 248
 249         if (alm_en & S3C2410_RTCALM_MINEN)
 250                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 251         else
 252                 alm_tm->tm_min = -1;
 253
 254         if (alm_en & S3C2410_RTCALM_HOUREN)
 255                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 256         else
 257                 alm_tm->tm_hour = -1;
 258
 259         if (alm_en & S3C2410_RTCALM_DAYEN)
 260                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 261         else
 262                 alm_tm->tm_mday = -1;
 263
 264         if (alm_en & S3C2410_RTCALM_MONEN) {
 265                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 266                 alm_tm->tm_mon -= 1;
 267         } else {
 268                 alm_tm->tm_mon = -1;
 269         }
 270
 271         if (alm_en & S3C2410_RTCALM_YEAREN)
 272                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 273         else
 274                 alm_tm->tm_year = -1;
 275
 276         return 0;
 277 }
 278
 279 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 280 {
 281         struct rtc_time *tm = &alrm->time;
 282         void __iomem *base = s3c_rtc_base;
 283         unsigned int alrm_en;
 284
 285         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 286                  alrm->enabled,
 287                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 288                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 289
 290
 291         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 292         writeb(0x00, base + S3C2410_RTCALM);
 293
 294         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 295                 alrm_en |= S3C2410_RTCALM_SECEN;
 296                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
 297         }
 298
 299         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 300                 alrm_en |= S3C2410_RTCALM_MINEN;
 301                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
 302         }
 303
 304         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 305                 alrm_en |= S3C2410_RTCALM_HOUREN;
 306                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
 307         }
 308
 309         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 310
 311         writeb(alrm_en, base + S3C2410_RTCALM);
 312
 313         s3c_rtc_setaie(dev, alrm->enabled);
 314
 315         return 0;
 316 }
 317
 318 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 319 {
 320         unsigned int ticnt;
 321
 322         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 323                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
 324                 ticnt &= S3C64XX_RTCCON_TICEN;
 325         } else {
 326                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 327                 ticnt &= S3C2410_TICNT_ENABLE;
 328         }
 329
 330         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 331         return 0;
 332 }
 333
 334 static int s3c_rtc_open(struct device *dev)
 335 {
 336         struct platform_device *pdev = to_platform_device(dev);
 337         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 338         int ret;
 339
 340         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 341                           IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);
 342
 343         if (ret) {
 344                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 345                 return ret;
 346         }
 347
 348         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 349                           IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);
 350
 351         if (ret) {
 352                 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 353                 goto tick_err;
 354         }
 355
 356         return ret;
 357
 358  tick_err:
 359         free_irq(s3c_rtc_alarmno, rtc_dev);
 360         return ret;
 361 }
 362
 363 static void s3c_rtc_release(struct device *dev)
 364 {
 365         struct platform_device *pdev = to_platform_device(dev);
 366         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 367
 368         /* do not clear AIE here, it may be needed for wake */
 369
 370         s3c_rtc_setpie(dev, 0);
 371         free_irq(s3c_rtc_alarmno, rtc_dev);
 372         free_irq(s3c_rtc_tickno, rtc_dev);
 373 }
 374
 375 static const struct rtc_class_ops s3c_rtcops = {
 376         .open           = s3c_rtc_open,
 377         .release        = s3c_rtc_release,
 378         .read_time      = s3c_rtc_gettime,
 379         .set_time       = s3c_rtc_settime,
 380         .read_alarm     = s3c_rtc_getalarm,
 381         .set_alarm      = s3c_rtc_setalarm,
 382         .irq_set_freq   = s3c_rtc_setfreq,
 383         .irq_set_state  = s3c_rtc_setpie,
 384         .proc           = s3c_rtc_proc,
 385         .alarm_irq_enable = s3c_rtc_setaie,
 386 };
 387
 388 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 389 {
 390         void __iomem *base = s3c_rtc_base;
 391         unsigned int tmp;
 392
 393         if (s3c_rtc_base == NULL)
 394                 return;
 395
 396         if (!en) {
 397                 tmp = readw(base + S3C2410_RTCCON);
 398                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 399                         tmp &= ~S3C64XX_RTCCON_TICEN;
 400                 tmp &= ~S3C2410_RTCCON_RTCEN;
 401                 writew(tmp, base + S3C2410_RTCCON);
 402
 403                 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
 404                         tmp = readb(base + S3C2410_TICNT);
 405                         tmp &= ~S3C2410_TICNT_ENABLE;
 406                         writeb(tmp, base + S3C2410_TICNT);
 407                 }
 408         } else {
 409                 /* re-enable the device, and check it is ok */
 410
 411                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 412                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 413
 414                         tmp = readw(base + S3C2410_RTCCON);
 415                         writew(tmp | S3C2410_RTCCON_RTCEN,
 416                                 base + S3C2410_RTCCON);
 417                 }
 418
 419                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 420                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 421
 422                         tmp = readw(base + S3C2410_RTCCON);
 423                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 424                                 base + S3C2410_RTCCON);
 425                 }
 426
 427                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 428                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 429
 430                         tmp = readw(base + S3C2410_RTCCON);
 431                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 432                                 base + S3C2410_RTCCON);
 433                 }
 434         }
 435 }
 436
 437 static int __devexit s3c_rtc_remove(struct platform_device *dev)
 438 {
 439         struct rtc_device *rtc = platform_get_drvdata(dev);
 440
 441         platform_set_drvdata(dev, NULL);
 442         rtc_device_unregister(rtc);
 443
 444         s3c_rtc_setpie(&dev->dev, 0);
 445         s3c_rtc_setaie(&dev->dev, 0);
 446
 447         clk_disable(rtc_clk);
 448         clk_put(rtc_clk);
 449         rtc_clk = NULL;
 450
 451         iounmap(s3c_rtc_base);
 452         release_resource(s3c_rtc_mem);
 453         kfree(s3c_rtc_mem);
 454
 455         return 0;
 456 }
 457
 458 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 459 {
 460         struct rtc_device *rtc;
 461         struct rtc_time rtc_tm;
 462         struct resource *res;
 463         int ret;
 464
 465         pr_debug("%s: probe=%p\n", __func__, pdev);
 466
 467         /* find the IRQs */
 468
 469         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 470         if (s3c_rtc_tickno < 0) {
 471                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 472                 return -ENOENT;
 473         }
 474
 475         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 476         if (s3c_rtc_alarmno < 0) {
 477                 dev_err(&pdev->dev, "no irq for alarm\n");
 478                 return -ENOENT;
 479         }
 480
 481         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 482                  s3c_rtc_tickno, s3c_rtc_alarmno);
 483
 484         /* get the memory region */
 485
 486         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 487         if (res == NULL) {
 488                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 489                 return -ENOENT;
 490         }
 491
 492         s3c_rtc_mem = request_mem_region(res->start,
 493                                          res->end-res->start+1,
 494                                          pdev->name);
 495
 496         if (s3c_rtc_mem == NULL) {
 497                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 498                 ret = -ENOENT;
 499                 goto err_nores;
 500         }
 501
 502         s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
 503         if (s3c_rtc_base == NULL) {
 504                 dev_err(&pdev->dev, "failed ioremap()\n");
 505                 ret = -EINVAL;
 506                 goto err_nomap;
 507         }
 508
 509         rtc_clk = clk_get(&pdev->dev, "rtc");
 510         if (IS_ERR(rtc_clk)) {
 511                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 512                 ret = PTR_ERR(rtc_clk);
 513                 rtc_clk = NULL;
 514                 goto err_clk;
 515         }
 516
 517         clk_enable(rtc_clk);
 518
 519         /* check to see if everything is setup correctly */
 520
 521         s3c_rtc_enable(pdev, 1);
 522
 523         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 524                  readw(s3c_rtc_base + S3C2410_RTCCON));
 525
 526         device_init_wakeup(&pdev->dev, 1);
 527
 528         /* register RTC and exit */
 529
 530         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 531                                   THIS_MODULE);
 532
 533         if (IS_ERR(rtc)) {
 534                 dev_err(&pdev->dev, "cannot attach rtc\n");
 535                 ret = PTR_ERR(rtc);
 536                 goto err_nortc;
 537         }
 538
 539         s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
 540
 541         /* Check RTC Time */
 542
 543         s3c_rtc_gettime(NULL, &rtc_tm);
 544
 545         if (rtc_valid_tm(&rtc_tm)) {
 546                 rtc_tm.tm_year  = 100;
 547                 rtc_tm.tm_mon   = 0;
 548                 rtc_tm.tm_mday  = 1;
 549                 rtc_tm.tm_hour  = 0;
 550                 rtc_tm.tm_min   = 0;
 551                 rtc_tm.tm_sec   = 0;
 552
 553                 s3c_rtc_settime(NULL, &rtc_tm);
 554
 555                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 556         }
 557
 558         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 559                 rtc->max_user_freq = 32768;
 560         else
 561                 rtc->max_user_freq = 128;
 562
 563         platform_set_drvdata(pdev, rtc);
 564
 565         s3c_rtc_setfreq(&pdev->dev, 1);
 566
 567         return 0;
 568
 569  err_nortc:
 570         s3c_rtc_enable(pdev, 0);
 571         clk_disable(rtc_clk);
 572         clk_put(rtc_clk);
 573
 574  err_clk:
 575         iounmap(s3c_rtc_base);
 576
 577  err_nomap:
 578         release_resource(s3c_rtc_mem);
 579
 580  err_nores:
 581         return ret;
 582 }
 583
 584 #ifdef CONFIG_PM
 585
 586 /* RTC Power management control */
 587
 588 static int ticnt_save, ticnt_en_save;
 589
 590 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 591 {
 592         /* save TICNT for anyone using periodic interrupts */
 593         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 594         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 595                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
 596                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 597         }
 598         s3c_rtc_enable(pdev, 0);
 599
 600         if (device_may_wakeup(&pdev->dev))
 601                 enable_irq_wake(s3c_rtc_alarmno);
 602
 603         return 0;
 604 }
 605
 606 static int s3c_rtc_resume(struct platform_device *pdev)
 607 {
 608         unsigned int tmp;
 609
 610         s3c_rtc_enable(pdev, 1);
 611         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 612         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
 613                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 614                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
 615         }
 616
 617         if (device_may_wakeup(&pdev->dev))
 618                 disable_irq_wake(s3c_rtc_alarmno);
 619
 620         return 0;
 621 }
 622 #else
 623 #define s3c_rtc_suspend NULL
 624 #define s3c_rtc_resume  NULL
 625 #endif
 626
 627 static struct platform_device_id s3c_rtc_driver_ids[] = {
 628         {
 629                 .name           = "s3c2410-rtc",
 630                 .driver_data    = TYPE_S3C2410,
 631         }, {
 632                 .name           = "s3c64xx-rtc",
 633                 .driver_data    = TYPE_S3C64XX,
 634         },
 635         { }
 636 };
 637
 638 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 639
 640 static struct platform_driver s3c_rtc_driver = {
 641         .probe          = s3c_rtc_probe,
 642         .remove         = __devexit_p(s3c_rtc_remove),
 643         .suspend        = s3c_rtc_suspend,
 644         .resume         = s3c_rtc_resume,
 645         .id_table       = s3c_rtc_driver_ids,
 646         .driver         = {
 647                 .name   = "s3c-rtc",
 648                 .owner  = THIS_MODULE,
 649         },
 650 };
 651
 652 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
 653
 654 static int __init s3c_rtc_init(void)
 655 {
 656         printk(banner);
 657         return platform_driver_register(&s3c_rtc_driver);
 658 }
 659
 660 static void __exit s3c_rtc_exit(void)
 661 {
 662         platform_driver_unregister(&s3c_rtc_driver);
 663 }
 664
 665 module_init(s3c_rtc_init);
 666 module_exit(s3c_rtc_exit);
 667
 668 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 669 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 670 MODULE_LICENSE("GPL");
 671 MODULE_ALIAS("platform:s3c2410-rtc");