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 #include <linux/of.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/io.h>
  31
  32 #include <asm/irq.h>
  33 #include "rtc-s3c.h"
  34
  35 enum s3c_cpu_type {
  36         TYPE_S3C2410,
  37         TYPE_S3C2416,
  38         TYPE_S3C2443,
  39         TYPE_S3C64XX,
  40 };
  41
  42 struct s3c_rtc_drv_data {
  43         int cpu_type;
  44 };
  45
  46 struct s3c_rtc {
  47         struct device *dev;
  48         struct rtc_device *rtc;
  49
  50         void __iomem *base;
  51         struct clk *rtc_clk;
  52         bool enabled;
  53
  54         enum s3c_cpu_type cpu_type;
  55
  56         int irq_alarm;
  57         int irq_tick;
  58
  59         spinlock_t pie_lock;
  60         spinlock_t alarm_clk_lock;
  61
  62         int ticnt_save, ticnt_en_save;
  63         bool wake_en;
  64 };
  65
  66 static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable)
  67 {
  68         unsigned long irq_flags;
  69
  70         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
  71         if (enable) {
  72                 if (!info->enabled) {
  73                         clk_enable(info->rtc_clk);
  74                         info->enabled = true;
  75                 }
  76         } else {
  77                 if (info->enabled) {
  78                         clk_disable(info->rtc_clk);
  79                         info->enabled = false;
  80                 }
  81         }
  82         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
  83 }
  84
  85 /* IRQ Handlers */
  86 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
  87 {
  88         struct s3c_rtc *info = (struct s3c_rtc *)id;
  89
  90         clk_enable(info->rtc_clk);
  91         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
  92
  93         if (info->cpu_type == TYPE_S3C64XX)
  94                 writeb(S3C2410_INTP_ALM, info->base + S3C2410_INTP);
  95
  96         clk_disable(info->rtc_clk);
  97
  98         s3c_rtc_alarm_clk_enable(info, false);
  99
 100         return IRQ_HANDLED;
 101 }
 102
 103 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
 104 {
 105         struct s3c_rtc *info = (struct s3c_rtc *)id;
 106
 107         clk_enable(info->rtc_clk);
 108         rtc_update_irq(info->rtc, 1, RTC_PF | RTC_IRQF);
 109
 110         if (info->cpu_type == TYPE_S3C64XX)
 111                 writeb(S3C2410_INTP_TIC, info->base + S3C2410_INTP);
 112
 113         clk_disable(info->rtc_clk);
 114
 115         return IRQ_HANDLED;
 116 }
 117
 118 /* Update control registers */
 119 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 120 {
 121         struct s3c_rtc *info = dev_get_drvdata(dev);
 122         unsigned int tmp;
 123
 124         dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 125
 126         clk_enable(info->rtc_clk);
 127         tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 128
 129         if (enabled)
 130                 tmp |= S3C2410_RTCALM_ALMEN;
 131
 132         writeb(tmp, info->base + S3C2410_RTCALM);
 133         clk_disable(info->rtc_clk);
 134
 135         s3c_rtc_alarm_clk_enable(info, enabled);
 136
 137         return 0;
 138 }
 139
 140 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
 141 {
 142         unsigned int tmp = 0;
 143         int val;
 144
 145         if (!is_power_of_2(freq))
 146                 return -EINVAL;
 147
 148         clk_enable(info->rtc_clk);
 149         spin_lock_irq(&info->pie_lock);
 150
 151         if (info->cpu_type != TYPE_S3C64XX) {
 152                 tmp = readb(info->base + S3C2410_TICNT);
 153                 tmp &= S3C2410_TICNT_ENABLE;
 154         }
 155
 156         val = (info->rtc->max_user_freq / freq) - 1;
 157
 158         if (info->cpu_type == TYPE_S3C2416 || info->cpu_type == TYPE_S3C2443) {
 159                 tmp |= S3C2443_TICNT_PART(val);
 160                 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 161
 162                 if (info->cpu_type == TYPE_S3C2416)
 163                         writel(S3C2416_TICNT2_PART(val),
 164                                 info->base + S3C2416_TICNT2);
 165         } else {
 166                 tmp |= val;
 167         }
 168
 169         writel(tmp, info->base + S3C2410_TICNT);
 170         spin_unlock_irq(&info->pie_lock);
 171         clk_disable(info->rtc_clk);
 172
 173         return 0;
 174 }
 175
 176 /* Time read/write */
 177
 178 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 179 {
 180         struct s3c_rtc *info = dev_get_drvdata(dev);
 181         unsigned int have_retried = 0;
 182
 183         clk_enable(info->rtc_clk);
 184  retry_get_time:
 185         rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
 186         rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
 187         rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
 188         rtc_tm->tm_mon  = readb(info->base + S3C2410_RTCMON);
 189         rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
 190         rtc_tm->tm_sec  = readb(info->base + S3C2410_RTCSEC);
 191
 192         /* the only way to work out whether the system was mid-update
 193          * when we read it is to check the second counter, and if it
 194          * is zero, then we re-try the entire read
 195          */
 196
 197         if (rtc_tm->tm_sec == 0 && !have_retried) {
 198                 have_retried = 1;
 199                 goto retry_get_time;
 200         }
 201
 202         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 203         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 204         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 205         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 206         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 207         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 208
 209         rtc_tm->tm_year += 100;
 210
 211         dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
 212                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 213                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 214
 215         rtc_tm->tm_mon -= 1;
 216
 217         clk_disable(info->rtc_clk);
 218
 219         return rtc_valid_tm(rtc_tm);
 220 }
 221
 222 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 223 {
 224         struct s3c_rtc *info = dev_get_drvdata(dev);
 225         int year = tm->tm_year - 100;
 226
 227         dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
 228                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 229                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 230
 231         /* we get around y2k by simply not supporting it */
 232
 233         if (year < 0 || year >= 100) {
 234                 dev_err(dev, "rtc only supports 100 years\n");
 235                 return -EINVAL;
 236         }
 237
 238         clk_enable(info->rtc_clk);
 239
 240         writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
 241         writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
 242         writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
 243         writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
 244         writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
 245         writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
 246
 247         clk_disable(info->rtc_clk);
 248
 249         return 0;
 250 }
 251
 252 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 253 {
 254         struct s3c_rtc *info = dev_get_drvdata(dev);
 255         struct rtc_time *alm_tm = &alrm->time;
 256         unsigned int alm_en;
 257
 258         clk_enable(info->rtc_clk);
 259         alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
 260         alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
 261         alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
 262         alm_tm->tm_mon  = readb(info->base + S3C2410_ALMMON);
 263         alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
 264         alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
 265
 266         alm_en = readb(info->base + S3C2410_RTCALM);
 267
 268         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 269
 270         dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 271                  alm_en,
 272                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 273                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 274
 275
 276         /* decode the alarm enable field */
 277
 278         if (alm_en & S3C2410_RTCALM_SECEN)
 279                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 280         else
 281                 alm_tm->tm_sec = -1;
 282
 283         if (alm_en & S3C2410_RTCALM_MINEN)
 284                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 285         else
 286                 alm_tm->tm_min = -1;
 287
 288         if (alm_en & S3C2410_RTCALM_HOUREN)
 289                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 290         else
 291                 alm_tm->tm_hour = -1;
 292
 293         if (alm_en & S3C2410_RTCALM_DAYEN)
 294                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 295         else
 296                 alm_tm->tm_mday = -1;
 297
 298         if (alm_en & S3C2410_RTCALM_MONEN) {
 299                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 300                 alm_tm->tm_mon -= 1;
 301         } else {
 302                 alm_tm->tm_mon = -1;
 303         }
 304
 305         if (alm_en & S3C2410_RTCALM_YEAREN)
 306                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 307         else
 308                 alm_tm->tm_year = -1;
 309
 310         clk_disable(info->rtc_clk);
 311         return 0;
 312 }
 313
 314 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 315 {
 316         struct s3c_rtc *info = dev_get_drvdata(dev);
 317         struct rtc_time *tm = &alrm->time;
 318         unsigned int alrm_en;
 319
 320         clk_enable(info->rtc_clk);
 321         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 322                  alrm->enabled,
 323                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 324                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 325
 326         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 327         writeb(0x00, info->base + S3C2410_RTCALM);
 328
 329         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 330                 alrm_en |= S3C2410_RTCALM_SECEN;
 331                 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
 332         }
 333
 334         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 335                 alrm_en |= S3C2410_RTCALM_MINEN;
 336                 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
 337         }
 338
 339         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 340                 alrm_en |= S3C2410_RTCALM_HOUREN;
 341                 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
 342         }
 343
 344         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
 345
 346         writeb(alrm_en, info->base + S3C2410_RTCALM);
 347
 348         s3c_rtc_setaie(dev, alrm->enabled);
 349
 350         clk_disable(info->rtc_clk);
 351
 352         return 0;
 353 }
 354
 355 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 356 {
 357         struct s3c_rtc *info = dev_get_drvdata(dev);
 358         unsigned int ticnt;
 359
 360         clk_enable(info->rtc_clk);
 361         if (info->cpu_type == TYPE_S3C64XX) {
 362                 ticnt = readw(info->base + S3C2410_RTCCON);
 363                 ticnt &= S3C64XX_RTCCON_TICEN;
 364         } else {
 365                 ticnt = readb(info->base + S3C2410_TICNT);
 366                 ticnt &= S3C2410_TICNT_ENABLE;
 367         }
 368
 369         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 370         clk_disable(info->rtc_clk);
 371         return 0;
 372 }
 373
 374 static const struct rtc_class_ops s3c_rtcops = {
 375         .read_time      = s3c_rtc_gettime,
 376         .set_time       = s3c_rtc_settime,
 377         .read_alarm     = s3c_rtc_getalarm,
 378         .set_alarm      = s3c_rtc_setalarm,
 379         .proc           = s3c_rtc_proc,
 380         .alarm_irq_enable = s3c_rtc_setaie,
 381 };
 382
 383 static void s3c_rtc_enable(struct s3c_rtc *info, int en)
 384 {
 385         unsigned int tmp;
 386
 387         clk_enable(info->rtc_clk);
 388         if (!en) {
 389                 tmp = readw(info->base + S3C2410_RTCCON);
 390                 if (info->cpu_type == TYPE_S3C64XX)
 391                         tmp &= ~S3C64XX_RTCCON_TICEN;
 392                 tmp &= ~S3C2410_RTCCON_RTCEN;
 393                 writew(tmp, info->base + S3C2410_RTCCON);
 394
 395                 if (info->cpu_type != TYPE_S3C64XX) {
 396                         tmp = readb(info->base + S3C2410_TICNT);
 397                         tmp &= ~S3C2410_TICNT_ENABLE;
 398                         writeb(tmp, info->base + S3C2410_TICNT);
 399                 }
 400         } else {
 401                 /* re-enable the device, and check it is ok */
 402
 403                 if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 404                         dev_info(info->dev, "rtc disabled, re-enabling\n");
 405
 406                         tmp = readw(info->base + S3C2410_RTCCON);
 407                         writew(tmp | S3C2410_RTCCON_RTCEN,
 408                                 info->base + S3C2410_RTCCON);
 409                 }
 410
 411                 if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 412                         dev_info(info->dev, "removing RTCCON_CNTSEL\n");
 413
 414                         tmp = readw(info->base + S3C2410_RTCCON);
 415                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 416                                 info->base + S3C2410_RTCCON);
 417                 }
 418
 419                 if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 420                         dev_info(info->dev, "removing RTCCON_CLKRST\n");
 421
 422                         tmp = readw(info->base + S3C2410_RTCCON);
 423                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 424                                 info->base + S3C2410_RTCCON);
 425                 }
 426         }
 427         clk_disable(info->rtc_clk);
 428 }
 429
 430 static int s3c_rtc_remove(struct platform_device *pdev)
 431 {
 432         struct s3c_rtc *info = platform_get_drvdata(pdev);
 433
 434         s3c_rtc_setaie(info->dev, 0);
 435
 436         clk_unprepare(info->rtc_clk);
 437         info->rtc_clk = NULL;
 438
 439         return 0;
 440 }
 441
 442 static const struct of_device_id s3c_rtc_dt_match[];
 443
 444 static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
 445 {
 446 #ifdef CONFIG_OF
 447         struct s3c_rtc_drv_data *data;
 448         if (pdev->dev.of_node) {
 449                 const struct of_device_id *match;
 450                 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 451                 data = (struct s3c_rtc_drv_data *) match->data;
 452                 return data->cpu_type;
 453         }
 454 #endif
 455         return platform_get_device_id(pdev)->driver_data;
 456 }
 457
 458 static int s3c_rtc_probe(struct platform_device *pdev)
 459 {
 460         struct s3c_rtc *info = NULL;
 461         struct rtc_time rtc_tm;
 462         struct resource *res;
 463         int ret;
 464         int tmp;
 465
 466         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 467         if (!info)
 468                 return -ENOMEM;
 469
 470         /* find the IRQs */
 471         info->irq_tick = platform_get_irq(pdev, 1);
 472         if (info->irq_tick < 0) {
 473                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 474                 return info->irq_tick;
 475         }
 476
 477         info->dev = &pdev->dev;
 478         info->cpu_type = s3c_rtc_get_driver_data(pdev);
 479         spin_lock_init(&info->pie_lock);
 480         spin_lock_init(&info->alarm_clk_lock);
 481
 482         platform_set_drvdata(pdev, info);
 483
 484         info->irq_alarm = platform_get_irq(pdev, 0);
 485         if (info->irq_alarm < 0) {
 486                 dev_err(&pdev->dev, "no irq for alarm\n");
 487                 return info->irq_alarm;
 488         }
 489
 490         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 491                  info->irq_tick, info->irq_alarm);
 492
 493         /* get the memory region */
 494         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 495         info->base = devm_ioremap_resource(&pdev->dev, res);
 496         if (IS_ERR(info->base))
 497                 return PTR_ERR(info->base);
 498
 499         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 500         if (IS_ERR(info->rtc_clk)) {
 501                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 502                 return PTR_ERR(info->rtc_clk);
 503         }
 504         clk_prepare_enable(info->rtc_clk);
 505
 506         /* check to see if everything is setup correctly */
 507         s3c_rtc_enable(info, 1);
 508
 509         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 510                  readw(info->base + S3C2410_RTCCON));
 511
 512         device_init_wakeup(&pdev->dev, 1);
 513
 514         /* register RTC and exit */
 515         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 516                                   THIS_MODULE);
 517         if (IS_ERR(info->rtc)) {
 518                 dev_err(&pdev->dev, "cannot attach rtc\n");
 519                 ret = PTR_ERR(info->rtc);
 520                 goto err_nortc;
 521         }
 522
 523         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 524                           0,  "s3c2410-rtc alarm", info);
 525         if (ret) {
 526                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 527                 goto err_nortc;
 528         }
 529
 530         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 531                           0,  "s3c2410-rtc tick", info);
 532         if (ret) {
 533                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 534                 goto err_nortc;
 535         }
 536
 537         /* Check RTC Time */
 538         s3c_rtc_gettime(&pdev->dev, &rtc_tm);
 539
 540         if (rtc_valid_tm(&rtc_tm)) {
 541                 rtc_tm.tm_year  = 100;
 542                 rtc_tm.tm_mon   = 0;
 543                 rtc_tm.tm_mday  = 1;
 544                 rtc_tm.tm_hour  = 0;
 545                 rtc_tm.tm_min   = 0;
 546                 rtc_tm.tm_sec   = 0;
 547
 548                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 549
 550                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 551         }
 552
 553         if (info->cpu_type != TYPE_S3C2410)
 554                 info->rtc->max_user_freq = 32768;
 555         else
 556                 info->rtc->max_user_freq = 128;
 557
 558         if (info->cpu_type == TYPE_S3C2416 || info->cpu_type == TYPE_S3C2443) {
 559                 tmp = readw(info->base + S3C2410_RTCCON);
 560                 tmp |= S3C2443_RTCCON_TICSEL;
 561                 writew(tmp, info->base + S3C2410_RTCCON);
 562         }
 563
 564         s3c_rtc_setfreq(info, 1);
 565
 566         clk_disable(info->rtc_clk);
 567
 568         return 0;
 569
 570  err_nortc:
 571         s3c_rtc_enable(info, 0);
 572         clk_disable_unprepare(info->rtc_clk);
 573
 574         return ret;
 575 }
 576
 577 #ifdef CONFIG_PM_SLEEP
 578
 579 static int s3c_rtc_suspend(struct device *dev)
 580 {
 581         struct s3c_rtc *info = dev_get_drvdata(dev);
 582
 583         clk_enable(info->rtc_clk);
 584         /* save TICNT for anyone using periodic interrupts */
 585         if (info->cpu_type == TYPE_S3C64XX) {
 586                 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 587                 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 588                 info->ticnt_save = readl(info->base + S3C2410_TICNT);
 589         } else {
 590                 info->ticnt_save = readb(info->base + S3C2410_TICNT);
 591         }
 592         s3c_rtc_enable(info, 0);
 593
 594         if (device_may_wakeup(dev) && !info->wake_en) {
 595                 if (enable_irq_wake(info->irq_alarm) == 0)
 596                         info->wake_en = true;
 597                 else
 598                         dev_err(dev, "enable_irq_wake failed\n");
 599         }
 600         clk_disable(info->rtc_clk);
 601
 602         return 0;
 603 }
 604
 605 static int s3c_rtc_resume(struct device *dev)
 606 {
 607         struct s3c_rtc *info = dev_get_drvdata(dev);
 608         unsigned int tmp;
 609
 610         clk_enable(info->rtc_clk);
 611         s3c_rtc_enable(info, 1);
 612         if (info->cpu_type == TYPE_S3C64XX) {
 613                 writel(info->ticnt_save, info->base + S3C2410_TICNT);
 614                 if (info->ticnt_en_save) {
 615                         tmp = readw(info->base + S3C2410_RTCCON);
 616                         writew(tmp | info->ticnt_en_save,
 617                                         info->base + S3C2410_RTCCON);
 618                 }
 619         } else {
 620                 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 621         }
 622
 623         if (device_may_wakeup(dev) && info->wake_en) {
 624                 disable_irq_wake(info->irq_alarm);
 625                 info->wake_en = false;
 626         }
 627         clk_disable(info->rtc_clk);
 628
 629         return 0;
 630 }
 631 #endif
 632 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 633
 634 #ifdef CONFIG_OF
 635 static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
 636         [TYPE_S3C2410] = { TYPE_S3C2410 },
 637         [TYPE_S3C2416] = { TYPE_S3C2416 },
 638         [TYPE_S3C2443] = { TYPE_S3C2443 },
 639         [TYPE_S3C64XX] = { TYPE_S3C64XX },
 640 };
 641
 642 static const struct of_device_id s3c_rtc_dt_match[] = {
 643         {
 644                 .compatible = "samsung,s3c2410-rtc",
 645                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
 646         }, {
 647                 .compatible = "samsung,s3c2416-rtc",
 648                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
 649         }, {
 650                 .compatible = "samsung,s3c2443-rtc",
 651                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
 652         }, {
 653                 .compatible = "samsung,s3c6410-rtc",
 654                 .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
 655         },
 656         {},
 657 };
 658 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 659 #endif
 660
 661 static struct platform_device_id s3c_rtc_driver_ids[] = {
 662         {
 663                 .name           = "s3c2410-rtc",
 664                 .driver_data    = TYPE_S3C2410,
 665         }, {
 666                 .name           = "s3c2416-rtc",
 667                 .driver_data    = TYPE_S3C2416,
 668         }, {
 669                 .name           = "s3c2443-rtc",
 670                 .driver_data    = TYPE_S3C2443,
 671         }, {
 672                 .name           = "s3c64xx-rtc",
 673                 .driver_data    = TYPE_S3C64XX,
 674         },
 675         { }
 676 };
 677
 678 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 679
 680 static struct platform_driver s3c_rtc_driver = {
 681         .probe          = s3c_rtc_probe,
 682         .remove         = s3c_rtc_remove,
 683         .id_table       = s3c_rtc_driver_ids,
 684         .driver         = {
 685                 .name   = "s3c-rtc",
 686                 .owner  = THIS_MODULE,
 687                 .pm     = &s3c_rtc_pm_ops,
 688                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 689         },
 690 };
 691
 692 module_platform_driver(s3c_rtc_driver);
 693
 694 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 695 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 696 MODULE_LICENSE("GPL");
 697 MODULE_ALIAS("platform:s3c2410-rtc");