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 struct s3c_rtc {
  36         struct device *dev;
  37         struct rtc_device *rtc;
  38
  39         void __iomem *base;
  40         struct clk *rtc_clk;
  41         struct clk *rtc_src_clk;
  42         bool clk_disabled;
  43
  44         const struct s3c_rtc_data *data;
  45
  46         int irq_alarm;
  47         int irq_tick;
  48
  49         spinlock_t pie_lock;
  50         spinlock_t alarm_clk_lock;
  51
  52         int ticnt_save;
  53         int ticnt_en_save;
  54         bool wake_en;
  55 };
  56
  57 struct s3c_rtc_data {
  58         int max_user_freq;
  59         bool needs_src_clk;
  60
  61         void (*irq_handler) (struct s3c_rtc *info, int mask);
  62         void (*set_freq) (struct s3c_rtc *info, int freq);
  63         void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
  64         void (*select_tick_clk) (struct s3c_rtc *info);
  65         void (*save_tick_cnt) (struct s3c_rtc *info);
  66         void (*restore_tick_cnt) (struct s3c_rtc *info);
  67         void (*enable) (struct s3c_rtc *info);
  68         void (*disable) (struct s3c_rtc *info);
  69 };
  70
  71 static int s3c_rtc_enable_clk(struct s3c_rtc *info)
  72 {
  73         unsigned long irq_flags;
  74         int ret = 0;
  75
  76         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
  77
  78         if (info->clk_disabled) {
  79                 ret = clk_enable(info->rtc_clk);
  80                 if (ret)
  81                         goto out;
  82
  83                 if (info->data->needs_src_clk) {
  84                         ret = clk_enable(info->rtc_src_clk);
  85                         if (ret) {
  86                                 clk_disable(info->rtc_clk);
  87                                 goto out;
  88                         }
  89                 }
  90                 info->clk_disabled = false;
  91         }
  92
  93 out:
  94         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
  95
  96         return ret;
  97 }
  98
  99 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
 100 {
 101         unsigned long irq_flags;
 102
 103         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
 104         if (!info->clk_disabled) {
 105                 if (info->data->needs_src_clk)
 106                         clk_disable(info->rtc_src_clk);
 107                 clk_disable(info->rtc_clk);
 108                 info->clk_disabled = true;
 109         }
 110         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
 111 }
 112
 113 /* IRQ Handlers */
 114 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
 115 {
 116         struct s3c_rtc *info = (struct s3c_rtc *)id;
 117
 118         if (info->data->irq_handler)
 119                 info->data->irq_handler(info, S3C2410_INTP_TIC);
 120
 121         return IRQ_HANDLED;
 122 }
 123
 124 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
 125 {
 126         struct s3c_rtc *info = (struct s3c_rtc *)id;
 127
 128         if (info->data->irq_handler)
 129                 info->data->irq_handler(info, S3C2410_INTP_ALM);
 130
 131         return IRQ_HANDLED;
 132 }
 133
 134 /* Update control registers */
 135 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 136 {
 137         struct s3c_rtc *info = dev_get_drvdata(dev);
 138         unsigned int tmp;
 139         int ret;
 140
 141         dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 142
 143         ret = s3c_rtc_enable_clk(info);
 144         if (ret)
 145                 return ret;
 146
 147         tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 148
 149         if (enabled)
 150                 tmp |= S3C2410_RTCALM_ALMEN;
 151
 152         writeb(tmp, info->base + S3C2410_RTCALM);
 153
 154         s3c_rtc_disable_clk(info);
 155
 156         if (enabled) {
 157                 ret = s3c_rtc_enable_clk(info);
 158                 if (ret)
 159                         return ret;
 160         } else {
 161                 s3c_rtc_disable_clk(info);
 162         }
 163
 164         return 0;
 165 }
 166
 167 /* Set RTC frequency */
 168 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
 169 {
 170         int ret;
 171
 172         if (!is_power_of_2(freq))
 173                 return -EINVAL;
 174
 175         ret = s3c_rtc_enable_clk(info);
 176         if (ret)
 177                 return ret;
 178         spin_lock_irq(&info->pie_lock);
 179
 180         if (info->data->set_freq)
 181                 info->data->set_freq(info, freq);
 182
 183         spin_unlock_irq(&info->pie_lock);
 184         s3c_rtc_disable_clk(info);
 185
 186         return 0;
 187 }
 188
 189 /* Time read/write */
 190 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 191 {
 192         struct s3c_rtc *info = dev_get_drvdata(dev);
 193         unsigned int have_retried = 0;
 194         int ret;
 195
 196         ret = s3c_rtc_enable_clk(info);
 197         if (ret)
 198                 return ret;
 199
 200 retry_get_time:
 201         rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
 202         rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
 203         rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
 204         rtc_tm->tm_mon  = readb(info->base + S3C2410_RTCMON);
 205         rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
 206         rtc_tm->tm_sec  = readb(info->base + S3C2410_RTCSEC);
 207
 208         /* the only way to work out whether the system was mid-update
 209          * when we read it is to check the second counter, and if it
 210          * is zero, then we re-try the entire read
 211          */
 212
 213         if (rtc_tm->tm_sec == 0 && !have_retried) {
 214                 have_retried = 1;
 215                 goto retry_get_time;
 216         }
 217
 218         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 219         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 220         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 221         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 222         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 223         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 224
 225         s3c_rtc_disable_clk(info);
 226
 227         rtc_tm->tm_year += 100;
 228
 229         dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
 230                 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 231                 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 232
 233         rtc_tm->tm_mon -= 1;
 234
 235         return rtc_valid_tm(rtc_tm);
 236 }
 237
 238 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 239 {
 240         struct s3c_rtc *info = dev_get_drvdata(dev);
 241         int year = tm->tm_year - 100;
 242         int ret;
 243
 244         dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
 245                 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 246                 tm->tm_hour, tm->tm_min, tm->tm_sec);
 247
 248         /* we get around y2k by simply not supporting it */
 249
 250         if (year < 0 || year >= 100) {
 251                 dev_err(dev, "rtc only supports 100 years\n");
 252                 return -EINVAL;
 253         }
 254
 255         ret = s3c_rtc_enable_clk(info);
 256         if (ret)
 257                 return ret;
 258
 259         writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
 260         writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
 261         writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
 262         writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
 263         writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
 264         writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
 265
 266         s3c_rtc_disable_clk(info);
 267
 268         return 0;
 269 }
 270
 271 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 272 {
 273         struct s3c_rtc *info = dev_get_drvdata(dev);
 274         struct rtc_time *alm_tm = &alrm->time;
 275         unsigned int alm_en;
 276         int ret;
 277
 278         ret = s3c_rtc_enable_clk(info);
 279         if (ret)
 280                 return ret;
 281
 282         alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
 283         alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
 284         alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
 285         alm_tm->tm_mon  = readb(info->base + S3C2410_ALMMON);
 286         alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
 287         alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
 288
 289         alm_en = readb(info->base + S3C2410_RTCALM);
 290
 291         s3c_rtc_disable_clk(info);
 292
 293         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 294
 295         dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 296                 alm_en,
 297                 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 298                 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 299
 300         /* decode the alarm enable field */
 301         if (alm_en & S3C2410_RTCALM_SECEN)
 302                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 303
 304         if (alm_en & S3C2410_RTCALM_MINEN)
 305                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 306
 307         if (alm_en & S3C2410_RTCALM_HOUREN)
 308                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 309
 310         if (alm_en & S3C2410_RTCALM_DAYEN)
 311                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 312
 313         if (alm_en & S3C2410_RTCALM_MONEN) {
 314                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 315                 alm_tm->tm_mon -= 1;
 316         }
 317
 318         if (alm_en & S3C2410_RTCALM_YEAREN)
 319                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 320
 321         return 0;
 322 }
 323
 324 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 325 {
 326         struct s3c_rtc *info = dev_get_drvdata(dev);
 327         struct rtc_time *tm = &alrm->time;
 328         unsigned int alrm_en;
 329         int ret;
 330         int year = tm->tm_year - 100;
 331
 332         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 333                 alrm->enabled,
 334                 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 335                 tm->tm_hour, tm->tm_min, tm->tm_sec);
 336
 337         ret = s3c_rtc_enable_clk(info);
 338         if (ret)
 339                 return ret;
 340
 341         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 342         writeb(0x00, info->base + S3C2410_RTCALM);
 343
 344         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 345                 alrm_en |= S3C2410_RTCALM_SECEN;
 346                 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
 347         }
 348
 349         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 350                 alrm_en |= S3C2410_RTCALM_MINEN;
 351                 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
 352         }
 353
 354         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 355                 alrm_en |= S3C2410_RTCALM_HOUREN;
 356                 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
 357         }
 358
 359         if (year < 100 && year >= 0) {
 360                 alrm_en |= S3C2410_RTCALM_YEAREN;
 361                 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
 362         }
 363
 364         if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
 365                 alrm_en |= S3C2410_RTCALM_MONEN;
 366                 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
 367         }
 368
 369         if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
 370                 alrm_en |= S3C2410_RTCALM_DAYEN;
 371                 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
 372         }
 373
 374         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
 375
 376         writeb(alrm_en, info->base + S3C2410_RTCALM);
 377
 378         s3c_rtc_disable_clk(info);
 379
 380         s3c_rtc_setaie(dev, alrm->enabled);
 381
 382         return 0;
 383 }
 384
 385 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 386 {
 387         struct s3c_rtc *info = dev_get_drvdata(dev);
 388         int ret;
 389
 390         ret = s3c_rtc_enable_clk(info);
 391         if (ret)
 392                 return ret;
 393
 394         if (info->data->enable_tick)
 395                 info->data->enable_tick(info, seq);
 396
 397         s3c_rtc_disable_clk(info);
 398
 399         return 0;
 400 }
 401
 402 static const struct rtc_class_ops s3c_rtcops = {
 403         .read_time      = s3c_rtc_gettime,
 404         .set_time       = s3c_rtc_settime,
 405         .read_alarm     = s3c_rtc_getalarm,
 406         .set_alarm      = s3c_rtc_setalarm,
 407         .proc           = s3c_rtc_proc,
 408         .alarm_irq_enable = s3c_rtc_setaie,
 409 };
 410
 411 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 412 {
 413         unsigned int con, tmp;
 414
 415         con = readw(info->base + S3C2410_RTCCON);
 416         /* re-enable the device, and check it is ok */
 417         if ((con & S3C2410_RTCCON_RTCEN) == 0) {
 418                 dev_info(info->dev, "rtc disabled, re-enabling\n");
 419
 420                 tmp = readw(info->base + S3C2410_RTCCON);
 421                 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
 422         }
 423
 424         if (con & S3C2410_RTCCON_CNTSEL) {
 425                 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
 426
 427                 tmp = readw(info->base + S3C2410_RTCCON);
 428                 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 429                        info->base + S3C2410_RTCCON);
 430         }
 431
 432         if (con & S3C2410_RTCCON_CLKRST) {
 433                 dev_info(info->dev, "removing RTCCON_CLKRST\n");
 434
 435                 tmp = readw(info->base + S3C2410_RTCCON);
 436                 writew(tmp & ~S3C2410_RTCCON_CLKRST,
 437                        info->base + S3C2410_RTCCON);
 438         }
 439 }
 440
 441 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
 442 {
 443         unsigned int con;
 444
 445         con = readw(info->base + S3C2410_RTCCON);
 446         con &= ~S3C2410_RTCCON_RTCEN;
 447         writew(con, info->base + S3C2410_RTCCON);
 448
 449         con = readb(info->base + S3C2410_TICNT);
 450         con &= ~S3C2410_TICNT_ENABLE;
 451         writeb(con, info->base + S3C2410_TICNT);
 452 }
 453
 454 static void s3c6410_rtc_disable(struct s3c_rtc *info)
 455 {
 456         unsigned int con;
 457
 458         con = readw(info->base + S3C2410_RTCCON);
 459         con &= ~S3C64XX_RTCCON_TICEN;
 460         con &= ~S3C2410_RTCCON_RTCEN;
 461         writew(con, info->base + S3C2410_RTCCON);
 462 }
 463
 464 static int s3c_rtc_remove(struct platform_device *pdev)
 465 {
 466         struct s3c_rtc *info = platform_get_drvdata(pdev);
 467
 468         s3c_rtc_setaie(info->dev, 0);
 469
 470         if (info->data->needs_src_clk)
 471                 clk_unprepare(info->rtc_src_clk);
 472         clk_unprepare(info->rtc_clk);
 473
 474         return 0;
 475 }
 476
 477 static const struct of_device_id s3c_rtc_dt_match[];
 478
 479 static const struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
 480 {
 481         const struct of_device_id *match;
 482
 483         match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 484         return match->data;
 485 }
 486
 487 static int s3c_rtc_probe(struct platform_device *pdev)
 488 {
 489         struct s3c_rtc *info = NULL;
 490         struct rtc_time rtc_tm;
 491         struct resource *res;
 492         int ret;
 493
 494         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 495         if (!info)
 496                 return -ENOMEM;
 497
 498         /* find the IRQs */
 499         info->irq_tick = platform_get_irq(pdev, 1);
 500         if (info->irq_tick < 0) {
 501                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 502                 return info->irq_tick;
 503         }
 504
 505         info->dev = &pdev->dev;
 506         info->data = s3c_rtc_get_data(pdev);
 507         if (!info->data) {
 508                 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
 509                 return -EINVAL;
 510         }
 511         spin_lock_init(&info->pie_lock);
 512         spin_lock_init(&info->alarm_clk_lock);
 513
 514         platform_set_drvdata(pdev, info);
 515
 516         info->irq_alarm = platform_get_irq(pdev, 0);
 517         if (info->irq_alarm < 0) {
 518                 dev_err(&pdev->dev, "no irq for alarm\n");
 519                 return info->irq_alarm;
 520         }
 521
 522         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 523                 info->irq_tick, info->irq_alarm);
 524
 525         /* get the memory region */
 526         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 527         info->base = devm_ioremap_resource(&pdev->dev, res);
 528         if (IS_ERR(info->base))
 529                 return PTR_ERR(info->base);
 530
 531         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 532         if (IS_ERR(info->rtc_clk)) {
 533                 ret = PTR_ERR(info->rtc_clk);
 534                 if (ret != -EPROBE_DEFER)
 535                         dev_err(&pdev->dev, "failed to find rtc clock\n");
 536                 else
 537                         dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
 538                 return ret;
 539         }
 540         ret = clk_prepare_enable(info->rtc_clk);
 541         if (ret)
 542                 return ret;
 543
 544         if (info->data->needs_src_clk) {
 545                 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
 546                 if (IS_ERR(info->rtc_src_clk)) {
 547                         ret = PTR_ERR(info->rtc_src_clk);
 548                         if (ret != -EPROBE_DEFER)
 549                                 dev_err(&pdev->dev,
 550                                         "failed to find rtc source clock\n");
 551                         else
 552                                 dev_dbg(&pdev->dev,
 553                                         "probe deferred due to missing rtc src clk\n");
 554                         goto err_src_clk;
 555                 }
 556                 ret = clk_prepare_enable(info->rtc_src_clk);
 557                 if (ret)
 558                         goto err_src_clk;
 559         }
 560
 561         /* check to see if everything is setup correctly */
 562         if (info->data->enable)
 563                 info->data->enable(info);
 564
 565         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 566                 readw(info->base + S3C2410_RTCCON));
 567
 568         device_init_wakeup(&pdev->dev, 1);
 569
 570         /* Check RTC Time */
 571         if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
 572                 rtc_tm.tm_year  = 100;
 573                 rtc_tm.tm_mon   = 0;
 574                 rtc_tm.tm_mday  = 1;
 575                 rtc_tm.tm_hour  = 0;
 576                 rtc_tm.tm_min   = 0;
 577                 rtc_tm.tm_sec   = 0;
 578
 579                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 580
 581                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 582         }
 583
 584         /* register RTC and exit */
 585         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 586                                              THIS_MODULE);
 587         if (IS_ERR(info->rtc)) {
 588                 dev_err(&pdev->dev, "cannot attach rtc\n");
 589                 ret = PTR_ERR(info->rtc);
 590                 goto err_nortc;
 591         }
 592
 593         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 594                                0, "s3c2410-rtc alarm", info);
 595         if (ret) {
 596                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 597                 goto err_nortc;
 598         }
 599
 600         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 601                                0, "s3c2410-rtc tick", info);
 602         if (ret) {
 603                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 604                 goto err_nortc;
 605         }
 606
 607         if (info->data->select_tick_clk)
 608                 info->data->select_tick_clk(info);
 609
 610         s3c_rtc_setfreq(info, 1);
 611
 612         return 0;
 613
 614 err_nortc:
 615         if (info->data->disable)
 616                 info->data->disable(info);
 617
 618         if (info->data->needs_src_clk)
 619                 clk_disable_unprepare(info->rtc_src_clk);
 620 err_src_clk:
 621         clk_disable_unprepare(info->rtc_clk);
 622
 623         return ret;
 624 }
 625
 626 #ifdef CONFIG_PM_SLEEP
 627
 628 static int s3c_rtc_suspend(struct device *dev)
 629 {
 630         struct s3c_rtc *info = dev_get_drvdata(dev);
 631         int ret;
 632
 633         ret = s3c_rtc_enable_clk(info);
 634         if (ret)
 635                 return ret;
 636
 637         /* save TICNT for anyone using periodic interrupts */
 638         if (info->data->save_tick_cnt)
 639                 info->data->save_tick_cnt(info);
 640
 641         if (info->data->disable)
 642                 info->data->disable(info);
 643
 644         if (device_may_wakeup(dev) && !info->wake_en) {
 645                 if (enable_irq_wake(info->irq_alarm) == 0)
 646                         info->wake_en = true;
 647                 else
 648                         dev_err(dev, "enable_irq_wake failed\n");
 649         }
 650
 651         return 0;
 652 }
 653
 654 static int s3c_rtc_resume(struct device *dev)
 655 {
 656         struct s3c_rtc *info = dev_get_drvdata(dev);
 657
 658         if (info->data->enable)
 659                 info->data->enable(info);
 660
 661         if (info->data->restore_tick_cnt)
 662                 info->data->restore_tick_cnt(info);
 663
 664         s3c_rtc_disable_clk(info);
 665
 666         if (device_may_wakeup(dev) && info->wake_en) {
 667                 disable_irq_wake(info->irq_alarm);
 668                 info->wake_en = false;
 669         }
 670
 671         return 0;
 672 }
 673 #endif
 674 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 675
 676 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
 677 {
 678         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 679 }
 680
 681 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
 682 {
 683         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 684         writeb(mask, info->base + S3C2410_INTP);
 685 }
 686
 687 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
 688 {
 689         unsigned int tmp = 0;
 690         int val;
 691
 692         tmp = readb(info->base + S3C2410_TICNT);
 693         tmp &= S3C2410_TICNT_ENABLE;
 694
 695         val = (info->rtc->max_user_freq / freq) - 1;
 696         tmp |= val;
 697
 698         writel(tmp, info->base + S3C2410_TICNT);
 699 }
 700
 701 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
 702 {
 703         unsigned int tmp = 0;
 704         int val;
 705
 706         tmp = readb(info->base + S3C2410_TICNT);
 707         tmp &= S3C2410_TICNT_ENABLE;
 708
 709         val = (info->rtc->max_user_freq / freq) - 1;
 710
 711         tmp |= S3C2443_TICNT_PART(val);
 712         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 713
 714         writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
 715
 716         writel(tmp, info->base + S3C2410_TICNT);
 717 }
 718
 719 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
 720 {
 721         unsigned int tmp = 0;
 722         int val;
 723
 724         tmp = readb(info->base + S3C2410_TICNT);
 725         tmp &= S3C2410_TICNT_ENABLE;
 726
 727         val = (info->rtc->max_user_freq / freq) - 1;
 728
 729         tmp |= S3C2443_TICNT_PART(val);
 730         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 731
 732         writel(tmp, info->base + S3C2410_TICNT);
 733 }
 734
 735 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
 736 {
 737         int val;
 738
 739         val = (info->rtc->max_user_freq / freq) - 1;
 740         writel(val, info->base + S3C2410_TICNT);
 741 }
 742
 743 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 744 {
 745         unsigned int ticnt;
 746
 747         ticnt = readb(info->base + S3C2410_TICNT);
 748         ticnt &= S3C2410_TICNT_ENABLE;
 749
 750         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 751 }
 752
 753 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
 754 {
 755         unsigned int con;
 756
 757         con = readw(info->base + S3C2410_RTCCON);
 758         con |= S3C2443_RTCCON_TICSEL;
 759         writew(con, info->base + S3C2410_RTCCON);
 760 }
 761
 762 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 763 {
 764         unsigned int ticnt;
 765
 766         ticnt = readw(info->base + S3C2410_RTCCON);
 767         ticnt &= S3C64XX_RTCCON_TICEN;
 768
 769         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 770 }
 771
 772 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
 773 {
 774         info->ticnt_save = readb(info->base + S3C2410_TICNT);
 775 }
 776
 777 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
 778 {
 779         writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 780 }
 781
 782 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
 783 {
 784         info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 785         info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 786         info->ticnt_save = readl(info->base + S3C2410_TICNT);
 787 }
 788
 789 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
 790 {
 791         unsigned int con;
 792
 793         writel(info->ticnt_save, info->base + S3C2410_TICNT);
 794         if (info->ticnt_en_save) {
 795                 con = readw(info->base + S3C2410_RTCCON);
 796                 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
 797         }
 798 }
 799
 800 static struct s3c_rtc_data const s3c2410_rtc_data = {
 801         .max_user_freq          = 128,
 802         .irq_handler            = s3c24xx_rtc_irq,
 803         .set_freq               = s3c2410_rtc_setfreq,
 804         .enable_tick            = s3c24xx_rtc_enable_tick,
 805         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 806         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 807         .enable                 = s3c24xx_rtc_enable,
 808         .disable                = s3c24xx_rtc_disable,
 809 };
 810
 811 static struct s3c_rtc_data const s3c2416_rtc_data = {
 812         .max_user_freq          = 32768,
 813         .irq_handler            = s3c24xx_rtc_irq,
 814         .set_freq               = s3c2416_rtc_setfreq,
 815         .enable_tick            = s3c24xx_rtc_enable_tick,
 816         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 817         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 818         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 819         .enable                 = s3c24xx_rtc_enable,
 820         .disable                = s3c24xx_rtc_disable,
 821 };
 822
 823 static struct s3c_rtc_data const s3c2443_rtc_data = {
 824         .max_user_freq          = 32768,
 825         .irq_handler            = s3c24xx_rtc_irq,
 826         .set_freq               = s3c2443_rtc_setfreq,
 827         .enable_tick            = s3c24xx_rtc_enable_tick,
 828         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 829         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 830         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 831         .enable                 = s3c24xx_rtc_enable,
 832         .disable                = s3c24xx_rtc_disable,
 833 };
 834
 835 static struct s3c_rtc_data const s3c6410_rtc_data = {
 836         .max_user_freq          = 32768,
 837         .needs_src_clk          = true,
 838         .irq_handler            = s3c6410_rtc_irq,
 839         .set_freq               = s3c6410_rtc_setfreq,
 840         .enable_tick            = s3c6410_rtc_enable_tick,
 841         .save_tick_cnt          = s3c6410_rtc_save_tick_cnt,
 842         .restore_tick_cnt       = s3c6410_rtc_restore_tick_cnt,
 843         .enable                 = s3c24xx_rtc_enable,
 844         .disable                = s3c6410_rtc_disable,
 845 };
 846
 847 static const struct of_device_id s3c_rtc_dt_match[] = {
 848         {
 849                 .compatible = "samsung,s3c2410-rtc",
 850                 .data = &s3c2410_rtc_data,
 851         }, {
 852                 .compatible = "samsung,s3c2416-rtc",
 853                 .data = &s3c2416_rtc_data,
 854         }, {
 855                 .compatible = "samsung,s3c2443-rtc",
 856                 .data = &s3c2443_rtc_data,
 857         }, {
 858                 .compatible = "samsung,s3c6410-rtc",
 859                 .data = &s3c6410_rtc_data,
 860         }, {
 861                 .compatible = "samsung,exynos3250-rtc",
 862                 .data = &s3c6410_rtc_data,
 863         },
 864         { /* sentinel */ },
 865 };
 866 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 867
 868 static struct platform_driver s3c_rtc_driver = {
 869         .probe          = s3c_rtc_probe,
 870         .remove         = s3c_rtc_remove,
 871         .driver         = {
 872                 .name   = "s3c-rtc",
 873                 .pm     = &s3c_rtc_pm_ops,
 874                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 875         },
 876 };
 877 module_platform_driver(s3c_rtc_driver);
 878
 879 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 880 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 881 MODULE_LICENSE("GPL");
 882 MODULE_ALIAS("platform:s3c2410-rtc");