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 con, tmp;
 386
 387         clk_enable(info->rtc_clk);
 388
 389         con = readw(info->base + S3C2410_RTCCON);
 390         if (!en) {
 391                 if (info->cpu_type == TYPE_S3C64XX)
 392                         con &= ~S3C64XX_RTCCON_TICEN;
 393                 con &= ~S3C2410_RTCCON_RTCEN;
 394                 writew(con, info->base + S3C2410_RTCCON);
 395
 396                 if (info->cpu_type != TYPE_S3C64XX) {
 397                         con = readb(info->base + S3C2410_TICNT);
 398                         con &= ~S3C2410_TICNT_ENABLE;
 399                         writeb(con, info->base + S3C2410_TICNT);
 400                 }
 401         } else {
 402                 /* re-enable the device, and check it is ok */
 403                 if ((con & 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 (con & 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 (con & 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
 449         if (pdev->dev.of_node) {
 450                 const struct of_device_id *match;
 451
 452                 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 453                 data = (struct s3c_rtc_drv_data *) match->data;
 454                 return data->cpu_type;
 455         }
 456 #endif
 457         return platform_get_device_id(pdev)->driver_data;
 458 }
 459
 460 static int s3c_rtc_probe(struct platform_device *pdev)
 461 {
 462         struct s3c_rtc *info = NULL;
 463         struct rtc_time rtc_tm;
 464         struct resource *res;
 465         int ret;
 466         int tmp;
 467
 468         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 469         if (!info)
 470                 return -ENOMEM;
 471
 472         /* find the IRQs */
 473         info->irq_tick = platform_get_irq(pdev, 1);
 474         if (info->irq_tick < 0) {
 475                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 476                 return info->irq_tick;
 477         }
 478
 479         info->dev = &pdev->dev;
 480         info->cpu_type = s3c_rtc_get_driver_data(pdev);
 481         spin_lock_init(&info->pie_lock);
 482         spin_lock_init(&info->alarm_clk_lock);
 483
 484         platform_set_drvdata(pdev, info);
 485
 486         info->irq_alarm = platform_get_irq(pdev, 0);
 487         if (info->irq_alarm < 0) {
 488                 dev_err(&pdev->dev, "no irq for alarm\n");
 489                 return info->irq_alarm;
 490         }
 491
 492         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 493                  info->irq_tick, info->irq_alarm);
 494
 495         /* get the memory region */
 496         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 497         info->base = devm_ioremap_resource(&pdev->dev, res);
 498         if (IS_ERR(info->base))
 499                 return PTR_ERR(info->base);
 500
 501         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 502         if (IS_ERR(info->rtc_clk)) {
 503                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 504                 return PTR_ERR(info->rtc_clk);
 505         }
 506         clk_prepare_enable(info->rtc_clk);
 507
 508         /* check to see if everything is setup correctly */
 509         s3c_rtc_enable(info, 1);
 510
 511         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 512                  readw(info->base + S3C2410_RTCCON));
 513
 514         device_init_wakeup(&pdev->dev, 1);
 515
 516         /* register RTC and exit */
 517         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 518                                   THIS_MODULE);
 519         if (IS_ERR(info->rtc)) {
 520                 dev_err(&pdev->dev, "cannot attach rtc\n");
 521                 ret = PTR_ERR(info->rtc);
 522                 goto err_nortc;
 523         }
 524
 525         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 526                           0,  "s3c2410-rtc alarm", info);
 527         if (ret) {
 528                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 529                 goto err_nortc;
 530         }
 531
 532         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 533                           0,  "s3c2410-rtc tick", info);
 534         if (ret) {
 535                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 536                 goto err_nortc;
 537         }
 538
 539         /* Check RTC Time */
 540         s3c_rtc_gettime(&pdev->dev, &rtc_tm);
 541
 542         if (rtc_valid_tm(&rtc_tm)) {
 543                 rtc_tm.tm_year  = 100;
 544                 rtc_tm.tm_mon   = 0;
 545                 rtc_tm.tm_mday  = 1;
 546                 rtc_tm.tm_hour  = 0;
 547                 rtc_tm.tm_min   = 0;
 548                 rtc_tm.tm_sec   = 0;
 549
 550                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 551
 552                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 553         }
 554
 555         if (info->cpu_type != TYPE_S3C2410)
 556                 info->rtc->max_user_freq = 32768;
 557         else
 558                 info->rtc->max_user_freq = 128;
 559
 560         if (info->cpu_type == TYPE_S3C2416 || info->cpu_type == TYPE_S3C2443) {
 561                 tmp = readw(info->base + S3C2410_RTCCON);
 562                 tmp |= S3C2443_RTCCON_TICSEL;
 563                 writew(tmp, info->base + S3C2410_RTCCON);
 564         }
 565
 566         s3c_rtc_setfreq(info, 1);
 567
 568         clk_disable(info->rtc_clk);
 569
 570         return 0;
 571
 572  err_nortc:
 573         s3c_rtc_enable(info, 0);
 574         clk_disable_unprepare(info->rtc_clk);
 575
 576         return ret;
 577 }
 578
 579 #ifdef CONFIG_PM_SLEEP
 580
 581 static int s3c_rtc_suspend(struct device *dev)
 582 {
 583         struct s3c_rtc *info = dev_get_drvdata(dev);
 584
 585         clk_enable(info->rtc_clk);
 586         /* save TICNT for anyone using periodic interrupts */
 587         if (info->cpu_type == TYPE_S3C64XX) {
 588                 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 589                 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 590                 info->ticnt_save = readl(info->base + S3C2410_TICNT);
 591         } else {
 592                 info->ticnt_save = readb(info->base + S3C2410_TICNT);
 593         }
 594         s3c_rtc_enable(info, 0);
 595
 596         if (device_may_wakeup(dev) && !info->wake_en) {
 597                 if (enable_irq_wake(info->irq_alarm) == 0)
 598                         info->wake_en = true;
 599                 else
 600                         dev_err(dev, "enable_irq_wake failed\n");
 601         }
 602         clk_disable(info->rtc_clk);
 603
 604         return 0;
 605 }
 606
 607 static int s3c_rtc_resume(struct device *dev)
 608 {
 609         struct s3c_rtc *info = dev_get_drvdata(dev);
 610         unsigned int tmp;
 611
 612         clk_enable(info->rtc_clk);
 613         s3c_rtc_enable(info, 1);
 614         if (info->cpu_type == TYPE_S3C64XX) {
 615                 writel(info->ticnt_save, info->base + S3C2410_TICNT);
 616                 if (info->ticnt_en_save) {
 617                         tmp = readw(info->base + S3C2410_RTCCON);
 618                         writew(tmp | info->ticnt_en_save,
 619                                         info->base + S3C2410_RTCCON);
 620                 }
 621         } else {
 622                 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 623         }
 624
 625         if (device_may_wakeup(dev) && info->wake_en) {
 626                 disable_irq_wake(info->irq_alarm);
 627                 info->wake_en = false;
 628         }
 629         clk_disable(info->rtc_clk);
 630
 631         return 0;
 632 }
 633 #endif
 634 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 635
 636 #ifdef CONFIG_OF
 637 static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
 638         [TYPE_S3C2410] = { TYPE_S3C2410 },
 639         [TYPE_S3C2416] = { TYPE_S3C2416 },
 640         [TYPE_S3C2443] = { TYPE_S3C2443 },
 641         [TYPE_S3C64XX] = { TYPE_S3C64XX },
 642 };
 643
 644 static const struct of_device_id s3c_rtc_dt_match[] = {
 645         {
 646                 .compatible = "samsung,s3c2410-rtc",
 647                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
 648         }, {
 649                 .compatible = "samsung,s3c2416-rtc",
 650                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
 651         }, {
 652                 .compatible = "samsung,s3c2443-rtc",
 653                 .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
 654         }, {
 655                 .compatible = "samsung,s3c6410-rtc",
 656                 .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
 657         },
 658         {},
 659 };
 660 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 661 #endif
 662
 663 static struct platform_device_id s3c_rtc_driver_ids[] = {
 664         {
 665                 .name           = "s3c2410-rtc",
 666                 .driver_data    = TYPE_S3C2410,
 667         }, {
 668                 .name           = "s3c2416-rtc",
 669                 .driver_data    = TYPE_S3C2416,
 670         }, {
 671                 .name           = "s3c2443-rtc",
 672                 .driver_data    = TYPE_S3C2443,
 673         }, {
 674                 .name           = "s3c64xx-rtc",
 675                 .driver_data    = TYPE_S3C64XX,
 676         },
 677         { }
 678 };
 679
 680 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 681
 682 static struct platform_driver s3c_rtc_driver = {
 683         .probe          = s3c_rtc_probe,
 684         .remove         = s3c_rtc_remove,
 685         .id_table       = s3c_rtc_driver_ids,
 686         .driver         = {
 687                 .name   = "s3c-rtc",
 688                 .owner  = THIS_MODULE,
 689                 .pm     = &s3c_rtc_pm_ops,
 690                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 691         },
 692 };
 693
 694 module_platform_driver(s3c_rtc_driver);
 695
 696 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 697 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 698 MODULE_LICENSE("GPL");
 699 MODULE_ALIAS("platform:s3c2410-rtc");