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         int ret;
 448
 449         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 450         if (!info)
 451                 return -ENOMEM;
 452
 453         /* find the IRQs */
 454         info->irq_tick = platform_get_irq(pdev, 1);
 455         if (info->irq_tick < 0)
 456                 return info->irq_tick;
 457
 458         info->dev = &pdev->dev;
 459         info->data = of_device_get_match_data(&pdev->dev);
 460         if (!info->data) {
 461                 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
 462                 return -EINVAL;
 463         }
 464         spin_lock_init(&info->pie_lock);
 465         spin_lock_init(&info->alarm_lock);
 466
 467         platform_set_drvdata(pdev, info);
 468
 469         info->irq_alarm = platform_get_irq(pdev, 0);
 470         if (info->irq_alarm < 0)
 471                 return info->irq_alarm;
 472
 473         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 474                 info->irq_tick, info->irq_alarm);
 475
 476         /* get the memory region */
 477         info->base = devm_platform_ioremap_resource(pdev, 0);
 478         if (IS_ERR(info->base))
 479                 return PTR_ERR(info->base);
 480
 481         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 482         if (IS_ERR(info->rtc_clk)) {
 483                 ret = PTR_ERR(info->rtc_clk);
 484                 if (ret != -EPROBE_DEFER)
 485                         dev_err(&pdev->dev, "failed to find rtc clock\n");
 486                 else
 487                         dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
 488                 return ret;
 489         }
 490         ret = clk_prepare_enable(info->rtc_clk);
 491         if (ret)
 492                 return ret;
 493
 494         if (info->data->needs_src_clk) {
 495                 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
 496                 if (IS_ERR(info->rtc_src_clk)) {
 497                         ret = PTR_ERR(info->rtc_src_clk);
 498                         if (ret != -EPROBE_DEFER)
 499                                 dev_err(&pdev->dev,
 500                                         "failed to find rtc source clock\n");
 501                         else
 502                                 dev_dbg(&pdev->dev,
 503                                         "probe deferred due to missing rtc src clk\n");
 504                         goto err_src_clk;
 505                 }
 506                 ret = clk_prepare_enable(info->rtc_src_clk);
 507                 if (ret)
 508                         goto err_src_clk;
 509         }
 510
 511         /* check to see if everything is setup correctly */
 512         if (info->data->enable)
 513                 info->data->enable(info);
 514
 515         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 516                 readw(info->base + S3C2410_RTCCON));
 517
 518         device_init_wakeup(&pdev->dev, 1);
 519
 520         /* Check RTC Time */
 521         if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
 522                 rtc_tm.tm_year  = 100;
 523                 rtc_tm.tm_mon   = 0;
 524                 rtc_tm.tm_mday  = 1;
 525                 rtc_tm.tm_hour  = 0;
 526                 rtc_tm.tm_min   = 0;
 527                 rtc_tm.tm_sec   = 0;
 528
 529                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 530
 531                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 532         }
 533
 534         /* register RTC and exit */
 535         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 536                                              THIS_MODULE);
 537         if (IS_ERR(info->rtc)) {
 538                 dev_err(&pdev->dev, "cannot attach rtc\n");
 539                 ret = PTR_ERR(info->rtc);
 540                 goto err_nortc;
 541         }
 542
 543         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 544                                0, "s3c2410-rtc alarm", info);
 545         if (ret) {
 546                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 547                 goto err_nortc;
 548         }
 549
 550         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 551                                0, "s3c2410-rtc tick", info);
 552         if (ret) {
 553                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 554                 goto err_nortc;
 555         }
 556
 557         if (info->data->select_tick_clk)
 558                 info->data->select_tick_clk(info);
 559
 560         s3c_rtc_setfreq(info, 1);
 561
 562         s3c_rtc_disable_clk(info);
 563
 564         return 0;
 565
 566 err_nortc:
 567         if (info->data->disable)
 568                 info->data->disable(info);
 569
 570         if (info->data->needs_src_clk)
 571                 clk_disable_unprepare(info->rtc_src_clk);
 572 err_src_clk:
 573         clk_disable_unprepare(info->rtc_clk);
 574
 575         return ret;
 576 }
 577
 578 #ifdef CONFIG_PM_SLEEP
 579
 580 static int s3c_rtc_suspend(struct device *dev)
 581 {
 582         struct s3c_rtc *info = dev_get_drvdata(dev);
 583         int ret;
 584
 585         ret = s3c_rtc_enable_clk(info);
 586         if (ret)
 587                 return ret;
 588
 589         /* save TICNT for anyone using periodic interrupts */
 590         if (info->data->save_tick_cnt)
 591                 info->data->save_tick_cnt(info);
 592
 593         if (info->data->disable)
 594                 info->data->disable(info);
 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
 603         return 0;
 604 }
 605
 606 static int s3c_rtc_resume(struct device *dev)
 607 {
 608         struct s3c_rtc *info = dev_get_drvdata(dev);
 609
 610         if (info->data->enable)
 611                 info->data->enable(info);
 612
 613         if (info->data->restore_tick_cnt)
 614                 info->data->restore_tick_cnt(info);
 615
 616         s3c_rtc_disable_clk(info);
 617
 618         if (device_may_wakeup(dev) && info->wake_en) {
 619                 disable_irq_wake(info->irq_alarm);
 620                 info->wake_en = false;
 621         }
 622
 623         return 0;
 624 }
 625 #endif
 626 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 627
 628 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
 629 {
 630         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 631 }
 632
 633 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
 634 {
 635         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 636         writeb(mask, info->base + S3C2410_INTP);
 637 }
 638
 639 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
 640 {
 641         unsigned int tmp = 0;
 642         int val;
 643
 644         tmp = readb(info->base + S3C2410_TICNT);
 645         tmp &= S3C2410_TICNT_ENABLE;
 646
 647         val = (info->rtc->max_user_freq / freq) - 1;
 648         tmp |= val;
 649
 650         writel(tmp, info->base + S3C2410_TICNT);
 651 }
 652
 653 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
 654 {
 655         unsigned int tmp = 0;
 656         int val;
 657
 658         tmp = readb(info->base + S3C2410_TICNT);
 659         tmp &= S3C2410_TICNT_ENABLE;
 660
 661         val = (info->rtc->max_user_freq / freq) - 1;
 662
 663         tmp |= S3C2443_TICNT_PART(val);
 664         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 665
 666         writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
 667
 668         writel(tmp, info->base + S3C2410_TICNT);
 669 }
 670
 671 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
 672 {
 673         unsigned int tmp = 0;
 674         int val;
 675
 676         tmp = readb(info->base + S3C2410_TICNT);
 677         tmp &= S3C2410_TICNT_ENABLE;
 678
 679         val = (info->rtc->max_user_freq / freq) - 1;
 680
 681         tmp |= S3C2443_TICNT_PART(val);
 682         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 683
 684         writel(tmp, info->base + S3C2410_TICNT);
 685 }
 686
 687 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
 688 {
 689         int val;
 690
 691         val = (info->rtc->max_user_freq / freq) - 1;
 692         writel(val, info->base + S3C2410_TICNT);
 693 }
 694
 695 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 696 {
 697         unsigned int ticnt;
 698
 699         ticnt = readb(info->base + S3C2410_TICNT);
 700         ticnt &= S3C2410_TICNT_ENABLE;
 701
 702         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 703 }
 704
 705 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
 706 {
 707         unsigned int con;
 708
 709         con = readw(info->base + S3C2410_RTCCON);
 710         con |= S3C2443_RTCCON_TICSEL;
 711         writew(con, info->base + S3C2410_RTCCON);
 712 }
 713
 714 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 715 {
 716         unsigned int ticnt;
 717
 718         ticnt = readw(info->base + S3C2410_RTCCON);
 719         ticnt &= S3C64XX_RTCCON_TICEN;
 720
 721         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 722 }
 723
 724 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
 725 {
 726         info->ticnt_save = readb(info->base + S3C2410_TICNT);
 727 }
 728
 729 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
 730 {
 731         writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 732 }
 733
 734 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
 735 {
 736         info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 737         info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 738         info->ticnt_save = readl(info->base + S3C2410_TICNT);
 739 }
 740
 741 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
 742 {
 743         unsigned int con;
 744
 745         writel(info->ticnt_save, info->base + S3C2410_TICNT);
 746         if (info->ticnt_en_save) {
 747                 con = readw(info->base + S3C2410_RTCCON);
 748                 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
 749         }
 750 }
 751
 752 static struct s3c_rtc_data const s3c2410_rtc_data = {
 753         .max_user_freq          = 128,
 754         .irq_handler            = s3c24xx_rtc_irq,
 755         .set_freq               = s3c2410_rtc_setfreq,
 756         .enable_tick            = s3c24xx_rtc_enable_tick,
 757         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 758         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 759         .enable                 = s3c24xx_rtc_enable,
 760         .disable                = s3c24xx_rtc_disable,
 761 };
 762
 763 static struct s3c_rtc_data const s3c2416_rtc_data = {
 764         .max_user_freq          = 32768,
 765         .irq_handler            = s3c24xx_rtc_irq,
 766         .set_freq               = s3c2416_rtc_setfreq,
 767         .enable_tick            = s3c24xx_rtc_enable_tick,
 768         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 769         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 770         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 771         .enable                 = s3c24xx_rtc_enable,
 772         .disable                = s3c24xx_rtc_disable,
 773 };
 774
 775 static struct s3c_rtc_data const s3c2443_rtc_data = {
 776         .max_user_freq          = 32768,
 777         .irq_handler            = s3c24xx_rtc_irq,
 778         .set_freq               = s3c2443_rtc_setfreq,
 779         .enable_tick            = s3c24xx_rtc_enable_tick,
 780         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 781         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 782         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 783         .enable                 = s3c24xx_rtc_enable,
 784         .disable                = s3c24xx_rtc_disable,
 785 };
 786
 787 static struct s3c_rtc_data const s3c6410_rtc_data = {
 788         .max_user_freq          = 32768,
 789         .needs_src_clk          = true,
 790         .irq_handler            = s3c6410_rtc_irq,
 791         .set_freq               = s3c6410_rtc_setfreq,
 792         .enable_tick            = s3c6410_rtc_enable_tick,
 793         .save_tick_cnt          = s3c6410_rtc_save_tick_cnt,
 794         .restore_tick_cnt       = s3c6410_rtc_restore_tick_cnt,
 795         .enable                 = s3c24xx_rtc_enable,
 796         .disable                = s3c6410_rtc_disable,
 797 };
 798
 799 static const struct of_device_id s3c_rtc_dt_match[] = {
 800         {
 801                 .compatible = "samsung,s3c2410-rtc",
 802                 .data = &s3c2410_rtc_data,
 803         }, {
 804                 .compatible = "samsung,s3c2416-rtc",
 805                 .data = &s3c2416_rtc_data,
 806         }, {
 807                 .compatible = "samsung,s3c2443-rtc",
 808                 .data = &s3c2443_rtc_data,
 809         }, {
 810                 .compatible = "samsung,s3c6410-rtc",
 811                 .data = &s3c6410_rtc_data,
 812         }, {
 813                 .compatible = "samsung,exynos3250-rtc",
 814                 .data = &s3c6410_rtc_data,
 815         },
 816         { /* sentinel */ },
 817 };
 818 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 819
 820 static struct platform_driver s3c_rtc_driver = {
 821         .probe          = s3c_rtc_probe,
 822         .remove         = s3c_rtc_remove,
 823         .driver         = {
 824                 .name   = "s3c-rtc",
 825                 .pm     = &s3c_rtc_pm_ops,
 826                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 827         },
 828 };
 829 module_platform_driver(s3c_rtc_driver);
 830
 831 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 832 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 833 MODULE_LICENSE("GPL");
 834 MODULE_ALIAS("platform:s3c2410-rtc");