drivers/rtc/rtc-s3c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* drivers/rtc/rtc-s3c.c
   3  *
   4  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com/
   6  *
   7  * Copyright (c) 2004,2006 Simtec Electronics
   8  *      Ben Dooks, <ben@simtec.co.uk>
   9  *      http://armlinux.simtec.co.uk/
  10  *
  11  * S3C2410/S3C2440/S3C24XX Internal RTC Driver
  12 */
  13
  14 #include <linux/module.h>
  15 #include <linux/fs.h>
  16 #include <linux/string.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/rtc.h>
  21 #include <linux/bcd.h>
  22 #include <linux/clk.h>
  23 #include <linux/log2.h>
  24 #include <linux/slab.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/io.h>
  29
  30 #include <asm/irq.h>
  31 #include "rtc-s3c.h"
  32
  33 struct s3c_rtc {
  34         struct device *dev;
  35         struct rtc_device *rtc;
  36
  37         void __iomem *base;
  38         struct clk *rtc_clk;
  39         struct clk *rtc_src_clk;
  40         bool alarm_enabled;
  41
  42         const struct s3c_rtc_data *data;
  43
  44         int irq_alarm;
  45         int irq_tick;
  46
  47         spinlock_t pie_lock;
  48         spinlock_t alarm_lock;
  49
  50         int ticnt_save;
  51         int ticnt_en_save;
  52         bool wake_en;
  53 };
  54
  55 struct s3c_rtc_data {
  56         int max_user_freq;
  57         bool needs_src_clk;
  58
  59         void (*irq_handler) (struct s3c_rtc *info, int mask);
  60         void (*set_freq) (struct s3c_rtc *info, int freq);
  61         void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
  62         void (*select_tick_clk) (struct s3c_rtc *info);
  63         void (*save_tick_cnt) (struct s3c_rtc *info);
  64         void (*restore_tick_cnt) (struct s3c_rtc *info);
  65         void (*enable) (struct s3c_rtc *info);
  66         void (*disable) (struct s3c_rtc *info);
  67 };
  68
  69 static int s3c_rtc_enable_clk(struct s3c_rtc *info)
  70 {
  71         int ret;
  72
  73         ret = clk_enable(info->rtc_clk);
  74         if (ret)
  75                 return ret;
  76
  77         if (info->data->needs_src_clk) {
  78                 ret = clk_enable(info->rtc_src_clk);
  79                 if (ret) {
  80                         clk_disable(info->rtc_clk);
  81                         return ret;
  82                 }
  83         }
  84         return 0;
  85 }
  86
  87 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
  88 {
  89         if (info->data->needs_src_clk)
  90                 clk_disable(info->rtc_src_clk);
  91         clk_disable(info->rtc_clk);
  92 }
  93
  94 /* IRQ Handlers */
  95 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
  96 {
  97         struct s3c_rtc *info = (struct s3c_rtc *)id;
  98
  99         if (info->data->irq_handler)
 100                 info->data->irq_handler(info, S3C2410_INTP_TIC);
 101
 102         return IRQ_HANDLED;
 103 }
 104
 105 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
 106 {
 107         struct s3c_rtc *info = (struct s3c_rtc *)id;
 108
 109         if (info->data->irq_handler)
 110                 info->data->irq_handler(info, S3C2410_INTP_ALM);
 111
 112         return IRQ_HANDLED;
 113 }
 114
 115 /* Update control registers */
 116 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 117 {
 118         struct s3c_rtc *info = dev_get_drvdata(dev);
 119         unsigned long flags;
 120         unsigned int tmp;
 121         int ret;
 122
 123         dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 124
 125         ret = s3c_rtc_enable_clk(info);
 126         if (ret)
 127                 return ret;
 128
 129         tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 130
 131         if (enabled)
 132                 tmp |= S3C2410_RTCALM_ALMEN;
 133
 134         writeb(tmp, info->base + S3C2410_RTCALM);
 135
 136         spin_lock_irqsave(&info->alarm_lock, flags);
 137
 138         if (info->alarm_enabled && !enabled)
 139                 s3c_rtc_disable_clk(info);
 140         else if (!info->alarm_enabled && enabled)
 141                 ret = s3c_rtc_enable_clk(info);
 142
 143         info->alarm_enabled = enabled;
 144         spin_unlock_irqrestore(&info->alarm_lock, flags);
 145
 146         s3c_rtc_disable_clk(info);
 147
 148         return ret;
 149 }
 150
 151 /* Set RTC frequency */
 152 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
 153 {
 154         int ret;
 155
 156         if (!is_power_of_2(freq))
 157                 return -EINVAL;
 158
 159         ret = s3c_rtc_enable_clk(info);
 160         if (ret)
 161                 return ret;
 162         spin_lock_irq(&info->pie_lock);
 163
 164         if (info->data->set_freq)
 165                 info->data->set_freq(info, freq);
 166
 167         spin_unlock_irq(&info->pie_lock);
 168         s3c_rtc_disable_clk(info);
 169
 170         return 0;
 171 }
 172
 173 /* Time read/write */
 174 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 175 {
 176         struct s3c_rtc *info = dev_get_drvdata(dev);
 177         unsigned int have_retried = 0;
 178         int ret;
 179
 180         ret = s3c_rtc_enable_clk(info);
 181         if (ret)
 182                 return ret;
 183
 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         s3c_rtc_disable_clk(info);
 210
 211         rtc_tm->tm_year += 100;
 212         rtc_tm->tm_mon -= 1;
 213
 214         dev_dbg(dev, "read time %ptR\n", rtc_tm);
 215         return 0;
 216 }
 217
 218 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 219 {
 220         struct s3c_rtc *info = dev_get_drvdata(dev);
 221         int year = tm->tm_year - 100;
 222         int ret;
 223
 224         dev_dbg(dev, "set time %ptR\n", tm);
 225
 226         /* we get around y2k by simply not supporting it */
 227
 228         if (year < 0 || year >= 100) {
 229                 dev_err(dev, "rtc only supports 100 years\n");
 230                 return -EINVAL;
 231         }
 232
 233         ret = s3c_rtc_enable_clk(info);
 234         if (ret)
 235                 return ret;
 236
 237         writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
 238         writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
 239         writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
 240         writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
 241         writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
 242         writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
 243
 244         s3c_rtc_disable_clk(info);
 245
 246         return 0;
 247 }
 248
 249 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 250 {
 251         struct s3c_rtc *info = dev_get_drvdata(dev);
 252         struct rtc_time *alm_tm = &alrm->time;
 253         unsigned int alm_en;
 254         int ret;
 255
 256         ret = s3c_rtc_enable_clk(info);
 257         if (ret)
 258                 return ret;
 259
 260         alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
 261         alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
 262         alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
 263         alm_tm->tm_mon  = readb(info->base + S3C2410_ALMMON);
 264         alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
 265         alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
 266
 267         alm_en = readb(info->base + S3C2410_RTCALM);
 268
 269         s3c_rtc_disable_clk(info);
 270
 271         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 272
 273         dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
 274
 275         /* decode the alarm enable field */
 276         if (alm_en & S3C2410_RTCALM_SECEN)
 277                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 278
 279         if (alm_en & S3C2410_RTCALM_MINEN)
 280                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 281
 282         if (alm_en & S3C2410_RTCALM_HOUREN)
 283                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 284
 285         if (alm_en & S3C2410_RTCALM_DAYEN)
 286                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 287
 288         if (alm_en & S3C2410_RTCALM_MONEN) {
 289                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 290                 alm_tm->tm_mon -= 1;
 291         }
 292
 293         if (alm_en & S3C2410_RTCALM_YEAREN)
 294                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 295
 296         return 0;
 297 }
 298
 299 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 300 {
 301         struct s3c_rtc *info = dev_get_drvdata(dev);
 302         struct rtc_time *tm = &alrm->time;
 303         unsigned int alrm_en;
 304         int ret;
 305
 306         dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
 307
 308         ret = s3c_rtc_enable_clk(info);
 309         if (ret)
 310                 return ret;
 311
 312         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 313         writeb(0x00, info->base + S3C2410_RTCALM);
 314
 315         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 316                 alrm_en |= S3C2410_RTCALM_SECEN;
 317                 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
 318         }
 319
 320         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 321                 alrm_en |= S3C2410_RTCALM_MINEN;
 322                 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
 323         }
 324
 325         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 326                 alrm_en |= S3C2410_RTCALM_HOUREN;
 327                 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
 328         }
 329
 330         if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
 331                 alrm_en |= S3C2410_RTCALM_MONEN;
 332                 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
 333         }
 334
 335         if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
 336                 alrm_en |= S3C2410_RTCALM_DAYEN;
 337                 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
 338         }
 339
 340         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
 341
 342         writeb(alrm_en, info->base + S3C2410_RTCALM);
 343
 344         s3c_rtc_setaie(dev, alrm->enabled);
 345
 346         s3c_rtc_disable_clk(info);
 347
 348         return 0;
 349 }
 350
 351 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 352 {
 353         struct s3c_rtc *info = dev_get_drvdata(dev);
 354         int ret;
 355
 356         ret = s3c_rtc_enable_clk(info);
 357         if (ret)
 358                 return ret;
 359
 360         if (info->data->enable_tick)
 361                 info->data->enable_tick(info, seq);
 362
 363         s3c_rtc_disable_clk(info);
 364
 365         return 0;
 366 }
 367
 368 static const struct rtc_class_ops s3c_rtcops = {
 369         .read_time      = s3c_rtc_gettime,
 370         .set_time       = s3c_rtc_settime,
 371         .read_alarm     = s3c_rtc_getalarm,
 372         .set_alarm      = s3c_rtc_setalarm,
 373         .proc           = s3c_rtc_proc,
 374         .alarm_irq_enable = s3c_rtc_setaie,
 375 };
 376
 377 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 378 {
 379         unsigned int con, tmp;
 380
 381         con = readw(info->base + S3C2410_RTCCON);
 382         /* re-enable the device, and check it is ok */
 383         if ((con & S3C2410_RTCCON_RTCEN) == 0) {
 384                 dev_info(info->dev, "rtc disabled, re-enabling\n");
 385
 386                 tmp = readw(info->base + S3C2410_RTCCON);
 387                 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
 388         }
 389
 390         if (con & S3C2410_RTCCON_CNTSEL) {
 391                 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
 392
 393                 tmp = readw(info->base + S3C2410_RTCCON);
 394                 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 395                        info->base + S3C2410_RTCCON);
 396         }
 397
 398         if (con & S3C2410_RTCCON_CLKRST) {
 399                 dev_info(info->dev, "removing RTCCON_CLKRST\n");
 400
 401                 tmp = readw(info->base + S3C2410_RTCCON);
 402                 writew(tmp & ~S3C2410_RTCCON_CLKRST,
 403                        info->base + S3C2410_RTCCON);
 404         }
 405 }
 406
 407 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
 408 {
 409         unsigned int con;
 410
 411         con = readw(info->base + S3C2410_RTCCON);
 412         con &= ~S3C2410_RTCCON_RTCEN;
 413         writew(con, info->base + S3C2410_RTCCON);
 414
 415         con = readb(info->base + S3C2410_TICNT);
 416         con &= ~S3C2410_TICNT_ENABLE;
 417         writeb(con, info->base + S3C2410_TICNT);
 418 }
 419
 420 static void s3c6410_rtc_disable(struct s3c_rtc *info)
 421 {
 422         unsigned int con;
 423
 424         con = readw(info->base + S3C2410_RTCCON);
 425         con &= ~S3C64XX_RTCCON_TICEN;
 426         con &= ~S3C2410_RTCCON_RTCEN;
 427         writew(con, info->base + S3C2410_RTCCON);
 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         if (info->data->needs_src_clk)
 437                 clk_unprepare(info->rtc_src_clk);
 438         clk_unprepare(info->rtc_clk);
 439
 440         return 0;
 441 }
 442
 443 static int s3c_rtc_probe(struct platform_device *pdev)
 444 {
 445         struct s3c_rtc *info = NULL;
 446         struct rtc_time rtc_tm;
 447         struct resource *res;
 448         int ret;
 449
 450         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 451         if (!info)
 452                 return -ENOMEM;
 453
 454         /* find the IRQs */
 455         info->irq_tick = platform_get_irq(pdev, 1);
 456         if (info->irq_tick < 0) {
 457                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 458                 return info->irq_tick;
 459         }
 460
 461         info->dev = &pdev->dev;
 462         info->data = of_device_get_match_data(&pdev->dev);
 463         if (!info->data) {
 464                 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
 465                 return -EINVAL;
 466         }
 467         spin_lock_init(&info->pie_lock);
 468         spin_lock_init(&info->alarm_lock);
 469
 470         platform_set_drvdata(pdev, info);
 471
 472         info->irq_alarm = platform_get_irq(pdev, 0);
 473         if (info->irq_alarm < 0) {
 474                 dev_err(&pdev->dev, "no irq for alarm\n");
 475                 return info->irq_alarm;
 476         }
 477
 478         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 479                 info->irq_tick, info->irq_alarm);
 480
 481         /* get the memory region */
 482         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 483         info->base = devm_ioremap_resource(&pdev->dev, res);
 484         if (IS_ERR(info->base))
 485                 return PTR_ERR(info->base);
 486
 487         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 488         if (IS_ERR(info->rtc_clk)) {
 489                 ret = PTR_ERR(info->rtc_clk);
 490                 if (ret != -EPROBE_DEFER)
 491                         dev_err(&pdev->dev, "failed to find rtc clock\n");
 492                 else
 493                         dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
 494                 return ret;
 495         }
 496         ret = clk_prepare_enable(info->rtc_clk);
 497         if (ret)
 498                 return ret;
 499
 500         if (info->data->needs_src_clk) {
 501                 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
 502                 if (IS_ERR(info->rtc_src_clk)) {
 503                         ret = PTR_ERR(info->rtc_src_clk);
 504                         if (ret != -EPROBE_DEFER)
 505                                 dev_err(&pdev->dev,
 506                                         "failed to find rtc source clock\n");
 507                         else
 508                                 dev_dbg(&pdev->dev,
 509                                         "probe deferred due to missing rtc src clk\n");
 510                         goto err_src_clk;
 511                 }
 512                 ret = clk_prepare_enable(info->rtc_src_clk);
 513                 if (ret)
 514                         goto err_src_clk;
 515         }
 516
 517         /* check to see if everything is setup correctly */
 518         if (info->data->enable)
 519                 info->data->enable(info);
 520
 521         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 522                 readw(info->base + S3C2410_RTCCON));
 523
 524         device_init_wakeup(&pdev->dev, 1);
 525
 526         /* Check RTC Time */
 527         if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
 528                 rtc_tm.tm_year  = 100;
 529                 rtc_tm.tm_mon   = 0;
 530                 rtc_tm.tm_mday  = 1;
 531                 rtc_tm.tm_hour  = 0;
 532                 rtc_tm.tm_min   = 0;
 533                 rtc_tm.tm_sec   = 0;
 534
 535                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 536
 537                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 538         }
 539
 540         /* register RTC and exit */
 541         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 542                                              THIS_MODULE);
 543         if (IS_ERR(info->rtc)) {
 544                 dev_err(&pdev->dev, "cannot attach rtc\n");
 545                 ret = PTR_ERR(info->rtc);
 546                 goto err_nortc;
 547         }
 548
 549         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 550                                0, "s3c2410-rtc alarm", info);
 551         if (ret) {
 552                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 553                 goto err_nortc;
 554         }
 555
 556         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 557                                0, "s3c2410-rtc tick", info);
 558         if (ret) {
 559                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 560                 goto err_nortc;
 561         }
 562
 563         if (info->data->select_tick_clk)
 564                 info->data->select_tick_clk(info);
 565
 566         s3c_rtc_setfreq(info, 1);
 567
 568         s3c_rtc_disable_clk(info);
 569
 570         return 0;
 571
 572 err_nortc:
 573         if (info->data->disable)
 574                 info->data->disable(info);
 575
 576         if (info->data->needs_src_clk)
 577                 clk_disable_unprepare(info->rtc_src_clk);
 578 err_src_clk:
 579         clk_disable_unprepare(info->rtc_clk);
 580
 581         return ret;
 582 }
 583
 584 #ifdef CONFIG_PM_SLEEP
 585
 586 static int s3c_rtc_suspend(struct device *dev)
 587 {
 588         struct s3c_rtc *info = dev_get_drvdata(dev);
 589         int ret;
 590
 591         ret = s3c_rtc_enable_clk(info);
 592         if (ret)
 593                 return ret;
 594
 595         /* save TICNT for anyone using periodic interrupts */
 596         if (info->data->save_tick_cnt)
 597                 info->data->save_tick_cnt(info);
 598
 599         if (info->data->disable)
 600                 info->data->disable(info);
 601
 602         if (device_may_wakeup(dev) && !info->wake_en) {
 603                 if (enable_irq_wake(info->irq_alarm) == 0)
 604                         info->wake_en = true;
 605                 else
 606                         dev_err(dev, "enable_irq_wake failed\n");
 607         }
 608
 609         return 0;
 610 }
 611
 612 static int s3c_rtc_resume(struct device *dev)
 613 {
 614         struct s3c_rtc *info = dev_get_drvdata(dev);
 615
 616         if (info->data->enable)
 617                 info->data->enable(info);
 618
 619         if (info->data->restore_tick_cnt)
 620                 info->data->restore_tick_cnt(info);
 621
 622         s3c_rtc_disable_clk(info);
 623
 624         if (device_may_wakeup(dev) && info->wake_en) {
 625                 disable_irq_wake(info->irq_alarm);
 626                 info->wake_en = false;
 627         }
 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 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
 635 {
 636         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 637 }
 638
 639 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
 640 {
 641         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 642         writeb(mask, info->base + S3C2410_INTP);
 643 }
 644
 645 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
 646 {
 647         unsigned int tmp = 0;
 648         int val;
 649
 650         tmp = readb(info->base + S3C2410_TICNT);
 651         tmp &= S3C2410_TICNT_ENABLE;
 652
 653         val = (info->rtc->max_user_freq / freq) - 1;
 654         tmp |= val;
 655
 656         writel(tmp, info->base + S3C2410_TICNT);
 657 }
 658
 659 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
 660 {
 661         unsigned int tmp = 0;
 662         int val;
 663
 664         tmp = readb(info->base + S3C2410_TICNT);
 665         tmp &= S3C2410_TICNT_ENABLE;
 666
 667         val = (info->rtc->max_user_freq / freq) - 1;
 668
 669         tmp |= S3C2443_TICNT_PART(val);
 670         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 671
 672         writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
 673
 674         writel(tmp, info->base + S3C2410_TICNT);
 675 }
 676
 677 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
 678 {
 679         unsigned int tmp = 0;
 680         int val;
 681
 682         tmp = readb(info->base + S3C2410_TICNT);
 683         tmp &= S3C2410_TICNT_ENABLE;
 684
 685         val = (info->rtc->max_user_freq / freq) - 1;
 686
 687         tmp |= S3C2443_TICNT_PART(val);
 688         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 689
 690         writel(tmp, info->base + S3C2410_TICNT);
 691 }
 692
 693 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
 694 {
 695         int val;
 696
 697         val = (info->rtc->max_user_freq / freq) - 1;
 698         writel(val, info->base + S3C2410_TICNT);
 699 }
 700
 701 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 702 {
 703         unsigned int ticnt;
 704
 705         ticnt = readb(info->base + S3C2410_TICNT);
 706         ticnt &= S3C2410_TICNT_ENABLE;
 707
 708         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 709 }
 710
 711 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
 712 {
 713         unsigned int con;
 714
 715         con = readw(info->base + S3C2410_RTCCON);
 716         con |= S3C2443_RTCCON_TICSEL;
 717         writew(con, info->base + S3C2410_RTCCON);
 718 }
 719
 720 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 721 {
 722         unsigned int ticnt;
 723
 724         ticnt = readw(info->base + S3C2410_RTCCON);
 725         ticnt &= S3C64XX_RTCCON_TICEN;
 726
 727         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 728 }
 729
 730 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
 731 {
 732         info->ticnt_save = readb(info->base + S3C2410_TICNT);
 733 }
 734
 735 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
 736 {
 737         writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 738 }
 739
 740 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
 741 {
 742         info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 743         info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 744         info->ticnt_save = readl(info->base + S3C2410_TICNT);
 745 }
 746
 747 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
 748 {
 749         unsigned int con;
 750
 751         writel(info->ticnt_save, info->base + S3C2410_TICNT);
 752         if (info->ticnt_en_save) {
 753                 con = readw(info->base + S3C2410_RTCCON);
 754                 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
 755         }
 756 }
 757
 758 static struct s3c_rtc_data const s3c2410_rtc_data = {
 759         .max_user_freq          = 128,
 760         .irq_handler            = s3c24xx_rtc_irq,
 761         .set_freq               = s3c2410_rtc_setfreq,
 762         .enable_tick            = s3c24xx_rtc_enable_tick,
 763         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 764         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 765         .enable                 = s3c24xx_rtc_enable,
 766         .disable                = s3c24xx_rtc_disable,
 767 };
 768
 769 static struct s3c_rtc_data const s3c2416_rtc_data = {
 770         .max_user_freq          = 32768,
 771         .irq_handler            = s3c24xx_rtc_irq,
 772         .set_freq               = s3c2416_rtc_setfreq,
 773         .enable_tick            = s3c24xx_rtc_enable_tick,
 774         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 775         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 776         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 777         .enable                 = s3c24xx_rtc_enable,
 778         .disable                = s3c24xx_rtc_disable,
 779 };
 780
 781 static struct s3c_rtc_data const s3c2443_rtc_data = {
 782         .max_user_freq          = 32768,
 783         .irq_handler            = s3c24xx_rtc_irq,
 784         .set_freq               = s3c2443_rtc_setfreq,
 785         .enable_tick            = s3c24xx_rtc_enable_tick,
 786         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 787         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 788         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 789         .enable                 = s3c24xx_rtc_enable,
 790         .disable                = s3c24xx_rtc_disable,
 791 };
 792
 793 static struct s3c_rtc_data const s3c6410_rtc_data = {
 794         .max_user_freq          = 32768,
 795         .needs_src_clk          = true,
 796         .irq_handler            = s3c6410_rtc_irq,
 797         .set_freq               = s3c6410_rtc_setfreq,
 798         .enable_tick            = s3c6410_rtc_enable_tick,
 799         .save_tick_cnt          = s3c6410_rtc_save_tick_cnt,
 800         .restore_tick_cnt       = s3c6410_rtc_restore_tick_cnt,
 801         .enable                 = s3c24xx_rtc_enable,
 802         .disable                = s3c6410_rtc_disable,
 803 };
 804
 805 static const struct of_device_id s3c_rtc_dt_match[] = {
 806         {
 807                 .compatible = "samsung,s3c2410-rtc",
 808                 .data = &s3c2410_rtc_data,
 809         }, {
 810                 .compatible = "samsung,s3c2416-rtc",
 811                 .data = &s3c2416_rtc_data,
 812         }, {
 813                 .compatible = "samsung,s3c2443-rtc",
 814                 .data = &s3c2443_rtc_data,
 815         }, {
 816                 .compatible = "samsung,s3c6410-rtc",
 817                 .data = &s3c6410_rtc_data,
 818         }, {
 819                 .compatible = "samsung,exynos3250-rtc",
 820                 .data = &s3c6410_rtc_data,
 821         },
 822         { /* sentinel */ },
 823 };
 824 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 825
 826 static struct platform_driver s3c_rtc_driver = {
 827         .probe          = s3c_rtc_probe,
 828         .remove         = s3c_rtc_remove,
 829         .driver         = {
 830                 .name   = "s3c-rtc",
 831                 .pm     = &s3c_rtc_pm_ops,
 832                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 833         },
 834 };
 835 module_platform_driver(s3c_rtc_driver);
 836
 837 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 838 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 839 MODULE_LICENSE("GPL");
 840 MODULE_ALIAS("platform:s3c2410-rtc");