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         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, ticnt_en_save;
  53         bool wake_en;
  54 };
  55
  56 struct s3c_rtc_data {
  57         int max_user_freq;
  58         bool needs_src_clk;
  59
  60         void (*irq_handler) (struct s3c_rtc *info, int mask);
  61         void (*set_freq) (struct s3c_rtc *info, int freq);
  62         void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
  63         void (*select_tick_clk) (struct s3c_rtc *info);
  64         void (*save_tick_cnt) (struct s3c_rtc *info);
  65         void (*restore_tick_cnt) (struct s3c_rtc *info);
  66         void (*enable) (struct s3c_rtc *info);
  67         void (*disable) (struct s3c_rtc *info);
  68 };
  69
  70 static void s3c_rtc_enable_clk(struct s3c_rtc *info)
  71 {
  72         unsigned long irq_flags;
  73
  74         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
  75         if (info->clk_disabled) {
  76                 clk_enable(info->rtc_clk);
  77                 if (info->data->needs_src_clk)
  78                         clk_enable(info->rtc_src_clk);
  79                 info->clk_disabled = false;
  80         }
  81         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
  82 }
  83
  84 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
  85 {
  86         unsigned long irq_flags;
  87
  88         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
  89         if (!info->clk_disabled) {
  90                 if (info->data->needs_src_clk)
  91                         clk_disable(info->rtc_src_clk);
  92                 clk_disable(info->rtc_clk);
  93                 info->clk_disabled = true;
  94         }
  95         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
  96 }
  97
  98 /* IRQ Handlers */
  99 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
 100 {
 101         struct s3c_rtc *info = (struct s3c_rtc *)id;
 102
 103         if (info->data->irq_handler)
 104                 info->data->irq_handler(info, S3C2410_INTP_TIC);
 105
 106         return IRQ_HANDLED;
 107 }
 108
 109 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
 110 {
 111         struct s3c_rtc *info = (struct s3c_rtc *)id;
 112
 113         if (info->data->irq_handler)
 114                 info->data->irq_handler(info, S3C2410_INTP_ALM);
 115
 116         return IRQ_HANDLED;
 117 }
 118
 119 /* Update control registers */
 120 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 121 {
 122         struct s3c_rtc *info = dev_get_drvdata(dev);
 123         unsigned int tmp;
 124
 125         dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 126
 127         s3c_rtc_enable_clk(info);
 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         s3c_rtc_disable_clk(info);
 137
 138         if (enabled)
 139                 s3c_rtc_enable_clk(info);
 140         else
 141                 s3c_rtc_disable_clk(info);
 142
 143         return 0;
 144 }
 145
 146 /* Set RTC frequency */
 147 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
 148 {
 149         if (!is_power_of_2(freq))
 150                 return -EINVAL;
 151
 152         spin_lock_irq(&info->pie_lock);
 153
 154         if (info->data->set_freq)
 155                 info->data->set_freq(info, freq);
 156
 157         spin_unlock_irq(&info->pie_lock);
 158
 159         return 0;
 160 }
 161
 162 /* Time read/write */
 163 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 164 {
 165         struct s3c_rtc *info = dev_get_drvdata(dev);
 166         unsigned int have_retried = 0;
 167
 168         s3c_rtc_enable_clk(info);
 169
 170  retry_get_time:
 171         rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
 172         rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
 173         rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
 174         rtc_tm->tm_mon  = readb(info->base + S3C2410_RTCMON);
 175         rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
 176         rtc_tm->tm_sec  = readb(info->base + S3C2410_RTCSEC);
 177
 178         /* the only way to work out whether the system was mid-update
 179          * when we read it is to check the second counter, and if it
 180          * is zero, then we re-try the entire read
 181          */
 182
 183         if (rtc_tm->tm_sec == 0 && !have_retried) {
 184                 have_retried = 1;
 185                 goto retry_get_time;
 186         }
 187
 188         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 189         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 190         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 191         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 192         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 193         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 194
 195         s3c_rtc_disable_clk(info);
 196
 197         rtc_tm->tm_year += 100;
 198
 199         dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
 200                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 201                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 202
 203         rtc_tm->tm_mon -= 1;
 204
 205         return rtc_valid_tm(rtc_tm);
 206 }
 207
 208 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 209 {
 210         struct s3c_rtc *info = dev_get_drvdata(dev);
 211         int year = tm->tm_year - 100;
 212
 213         dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
 214                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 215                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 216
 217         /* we get around y2k by simply not supporting it */
 218
 219         if (year < 0 || year >= 100) {
 220                 dev_err(dev, "rtc only supports 100 years\n");
 221                 return -EINVAL;
 222         }
 223
 224         s3c_rtc_enable_clk(info);
 225
 226         writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
 227         writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
 228         writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
 229         writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
 230         writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
 231         writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
 232
 233         s3c_rtc_disable_clk(info);
 234
 235         return 0;
 236 }
 237
 238 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 239 {
 240         struct s3c_rtc *info = dev_get_drvdata(dev);
 241         struct rtc_time *alm_tm = &alrm->time;
 242         unsigned int alm_en;
 243
 244         s3c_rtc_enable_clk(info);
 245
 246         alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
 247         alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
 248         alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
 249         alm_tm->tm_mon  = readb(info->base + S3C2410_ALMMON);
 250         alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
 251         alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
 252
 253         alm_en = readb(info->base + S3C2410_RTCALM);
 254
 255         s3c_rtc_disable_clk(info);
 256
 257         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 258
 259         dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 260                  alm_en,
 261                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 262                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 263
 264         /* decode the alarm enable field */
 265         if (alm_en & S3C2410_RTCALM_SECEN)
 266                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 267         else
 268                 alm_tm->tm_sec = -1;
 269
 270         if (alm_en & S3C2410_RTCALM_MINEN)
 271                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 272         else
 273                 alm_tm->tm_min = -1;
 274
 275         if (alm_en & S3C2410_RTCALM_HOUREN)
 276                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 277         else
 278                 alm_tm->tm_hour = -1;
 279
 280         if (alm_en & S3C2410_RTCALM_DAYEN)
 281                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 282         else
 283                 alm_tm->tm_mday = -1;
 284
 285         if (alm_en & S3C2410_RTCALM_MONEN) {
 286                 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
 287                 alm_tm->tm_mon -= 1;
 288         } else {
 289                 alm_tm->tm_mon = -1;
 290         }
 291
 292         if (alm_en & S3C2410_RTCALM_YEAREN)
 293                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 294         else
 295                 alm_tm->tm_year = -1;
 296
 297         return 0;
 298 }
 299
 300 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 301 {
 302         struct s3c_rtc *info = dev_get_drvdata(dev);
 303         struct rtc_time *tm = &alrm->time;
 304         unsigned int alrm_en;
 305         int year = tm->tm_year - 100;
 306
 307         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 308                  alrm->enabled,
 309                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 310                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 311
 312         s3c_rtc_enable_clk(info);
 313
 314         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 315         writeb(0x00, info->base + S3C2410_RTCALM);
 316
 317         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 318                 alrm_en |= S3C2410_RTCALM_SECEN;
 319                 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
 320         }
 321
 322         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 323                 alrm_en |= S3C2410_RTCALM_MINEN;
 324                 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
 325         }
 326
 327         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 328                 alrm_en |= S3C2410_RTCALM_HOUREN;
 329                 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
 330         }
 331
 332         if (year < 100 && year >= 0) {
 333                 alrm_en |= S3C2410_RTCALM_YEAREN;
 334                 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR);
 335         }
 336
 337         if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
 338                 alrm_en |= S3C2410_RTCALM_MONEN;
 339                 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
 340         }
 341
 342         if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
 343                 alrm_en |= S3C2410_RTCALM_DAYEN;
 344                 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
 345         }
 346
 347         dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
 348
 349         writeb(alrm_en, info->base + S3C2410_RTCALM);
 350
 351         s3c_rtc_disable_clk(info);
 352
 353         s3c_rtc_setaie(dev, alrm->enabled);
 354
 355         return 0;
 356 }
 357
 358 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 359 {
 360         struct s3c_rtc *info = dev_get_drvdata(dev);
 361
 362         s3c_rtc_enable_clk(info);
 363
 364         if (info->data->enable_tick)
 365                 info->data->enable_tick(info, seq);
 366
 367         s3c_rtc_disable_clk(info);
 368
 369         return 0;
 370 }
 371
 372 static const struct rtc_class_ops s3c_rtcops = {
 373         .read_time      = s3c_rtc_gettime,
 374         .set_time       = s3c_rtc_settime,
 375         .read_alarm     = s3c_rtc_getalarm,
 376         .set_alarm      = s3c_rtc_setalarm,
 377         .proc           = s3c_rtc_proc,
 378         .alarm_irq_enable = s3c_rtc_setaie,
 379 };
 380
 381 static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 382 {
 383         unsigned int con, tmp;
 384
 385         con = readw(info->base + S3C2410_RTCCON);
 386         /* re-enable the device, and check it is ok */
 387         if ((con & S3C2410_RTCCON_RTCEN) == 0) {
 388                 dev_info(info->dev, "rtc disabled, re-enabling\n");
 389
 390                 tmp = readw(info->base + S3C2410_RTCCON);
 391                 writew(tmp | S3C2410_RTCCON_RTCEN,
 392                         info->base + S3C2410_RTCCON);
 393         }
 394
 395         if (con & S3C2410_RTCCON_CNTSEL) {
 396                 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
 397
 398                 tmp = readw(info->base + S3C2410_RTCCON);
 399                 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 400                         info->base + S3C2410_RTCCON);
 401         }
 402
 403         if (con & S3C2410_RTCCON_CLKRST) {
 404                 dev_info(info->dev, "removing RTCCON_CLKRST\n");
 405
 406                 tmp = readw(info->base + S3C2410_RTCCON);
 407                 writew(tmp & ~S3C2410_RTCCON_CLKRST,
 408                         info->base + S3C2410_RTCCON);
 409         }
 410 }
 411
 412 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
 413 {
 414         unsigned int con;
 415
 416         con = readw(info->base + S3C2410_RTCCON);
 417         con &= ~S3C2410_RTCCON_RTCEN;
 418         writew(con, info->base + S3C2410_RTCCON);
 419
 420         con = readb(info->base + S3C2410_TICNT);
 421         con &= ~S3C2410_TICNT_ENABLE;
 422         writeb(con, info->base + S3C2410_TICNT);
 423 }
 424
 425 static void s3c6410_rtc_disable(struct s3c_rtc *info)
 426 {
 427         unsigned int con;
 428
 429         con = readw(info->base + S3C2410_RTCCON);
 430         con &= ~S3C64XX_RTCCON_TICEN;
 431         con &= ~S3C2410_RTCCON_RTCEN;
 432         writew(con, info->base + S3C2410_RTCCON);
 433 }
 434
 435 static int s3c_rtc_remove(struct platform_device *pdev)
 436 {
 437         struct s3c_rtc *info = platform_get_drvdata(pdev);
 438
 439         s3c_rtc_setaie(info->dev, 0);
 440
 441         if (info->data->needs_src_clk)
 442                 clk_unprepare(info->rtc_src_clk);
 443         clk_unprepare(info->rtc_clk);
 444
 445         return 0;
 446 }
 447
 448 static const struct of_device_id s3c_rtc_dt_match[];
 449
 450 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
 451 {
 452         const struct of_device_id *match;
 453
 454         match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 455         return (struct s3c_rtc_data *)match->data;
 456 }
 457
 458 static int s3c_rtc_probe(struct platform_device *pdev)
 459 {
 460         struct s3c_rtc *info = NULL;
 461         struct rtc_time rtc_tm;
 462         struct resource *res;
 463         int ret;
 464
 465         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 466         if (!info)
 467                 return -ENOMEM;
 468
 469         /* find the IRQs */
 470         info->irq_tick = platform_get_irq(pdev, 1);
 471         if (info->irq_tick < 0) {
 472                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 473                 return info->irq_tick;
 474         }
 475
 476         info->dev = &pdev->dev;
 477         info->data = s3c_rtc_get_data(pdev);
 478         if (!info->data) {
 479                 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
 480                 return -EINVAL;
 481         }
 482         spin_lock_init(&info->pie_lock);
 483         spin_lock_init(&info->alarm_clk_lock);
 484
 485         platform_set_drvdata(pdev, info);
 486
 487         info->irq_alarm = platform_get_irq(pdev, 0);
 488         if (info->irq_alarm < 0) {
 489                 dev_err(&pdev->dev, "no irq for alarm\n");
 490                 return info->irq_alarm;
 491         }
 492
 493         dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 494                  info->irq_tick, info->irq_alarm);
 495
 496         /* get the memory region */
 497         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 498         info->base = devm_ioremap_resource(&pdev->dev, res);
 499         if (IS_ERR(info->base))
 500                 return PTR_ERR(info->base);
 501
 502         info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
 503         if (IS_ERR(info->rtc_clk)) {
 504                 ret = PTR_ERR(info->rtc_clk);
 505                 if (ret != -EPROBE_DEFER)
 506                         dev_err(&pdev->dev, "failed to find rtc clock\n");
 507                 else
 508                         dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
 509                 return ret;
 510         }
 511         clk_prepare_enable(info->rtc_clk);
 512
 513         if (info->data->needs_src_clk) {
 514                 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
 515                 if (IS_ERR(info->rtc_src_clk)) {
 516                         ret = PTR_ERR(info->rtc_src_clk);
 517                         if (ret != -EPROBE_DEFER)
 518                                 dev_err(&pdev->dev,
 519                                         "failed to find rtc source clock\n");
 520                         else
 521                                 dev_dbg(&pdev->dev,
 522                                         "probe deferred due to missing rtc src clk\n");
 523                         clk_disable_unprepare(info->rtc_clk);
 524                         return ret;
 525                 }
 526                 clk_prepare_enable(info->rtc_src_clk);
 527         }
 528
 529         /* check to see if everything is setup correctly */
 530         if (info->data->enable)
 531                 info->data->enable(info);
 532
 533         dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
 534                  readw(info->base + S3C2410_RTCCON));
 535
 536         device_init_wakeup(&pdev->dev, 1);
 537
 538         /* Check RTC Time */
 539         if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
 540                 rtc_tm.tm_year  = 100;
 541                 rtc_tm.tm_mon   = 0;
 542                 rtc_tm.tm_mday  = 1;
 543                 rtc_tm.tm_hour  = 0;
 544                 rtc_tm.tm_min   = 0;
 545                 rtc_tm.tm_sec   = 0;
 546
 547                 s3c_rtc_settime(&pdev->dev, &rtc_tm);
 548
 549                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 550         }
 551
 552         /* register RTC and exit */
 553         info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 554                                   THIS_MODULE);
 555         if (IS_ERR(info->rtc)) {
 556                 dev_err(&pdev->dev, "cannot attach rtc\n");
 557                 ret = PTR_ERR(info->rtc);
 558                 goto err_nortc;
 559         }
 560
 561         ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 562                           0,  "s3c2410-rtc alarm", info);
 563         if (ret) {
 564                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 565                 goto err_nortc;
 566         }
 567
 568         ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
 569                           0,  "s3c2410-rtc tick", info);
 570         if (ret) {
 571                 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 572                 goto err_nortc;
 573         }
 574
 575         if (info->data->select_tick_clk)
 576                 info->data->select_tick_clk(info);
 577
 578         s3c_rtc_setfreq(info, 1);
 579
 580         s3c_rtc_disable_clk(info);
 581
 582         return 0;
 583
 584  err_nortc:
 585         if (info->data->disable)
 586                 info->data->disable(info);
 587
 588         if (info->data->needs_src_clk)
 589                 clk_disable_unprepare(info->rtc_src_clk);
 590         clk_disable_unprepare(info->rtc_clk);
 591
 592         return ret;
 593 }
 594
 595 #ifdef CONFIG_PM_SLEEP
 596
 597 static int s3c_rtc_suspend(struct device *dev)
 598 {
 599         struct s3c_rtc *info = dev_get_drvdata(dev);
 600
 601         s3c_rtc_enable_clk(info);
 602
 603         /* save TICNT for anyone using periodic interrupts */
 604         if (info->data->save_tick_cnt)
 605                 info->data->save_tick_cnt(info);
 606
 607         if (info->data->disable)
 608                 info->data->disable(info);
 609
 610         if (device_may_wakeup(dev) && !info->wake_en) {
 611                 if (enable_irq_wake(info->irq_alarm) == 0)
 612                         info->wake_en = true;
 613                 else
 614                         dev_err(dev, "enable_irq_wake failed\n");
 615         }
 616
 617         return 0;
 618 }
 619
 620 static int s3c_rtc_resume(struct device *dev)
 621 {
 622         struct s3c_rtc *info = dev_get_drvdata(dev);
 623
 624         if (info->data->enable)
 625                 info->data->enable(info);
 626
 627         if (info->data->restore_tick_cnt)
 628                 info->data->restore_tick_cnt(info);
 629
 630         s3c_rtc_disable_clk(info);
 631
 632         if (device_may_wakeup(dev) && info->wake_en) {
 633                 disable_irq_wake(info->irq_alarm);
 634                 info->wake_en = false;
 635         }
 636
 637         return 0;
 638 }
 639 #endif
 640 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 641
 642 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
 643 {
 644         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 645 }
 646
 647 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
 648 {
 649         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
 650         writeb(mask, info->base + S3C2410_INTP);
 651 }
 652
 653 static void s3c2410_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         tmp |= val;
 663
 664         writel(tmp, info->base + S3C2410_TICNT);
 665 }
 666
 667 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
 668 {
 669         unsigned int tmp = 0;
 670         int val;
 671
 672         tmp = readb(info->base + S3C2410_TICNT);
 673         tmp &= S3C2410_TICNT_ENABLE;
 674
 675         val = (info->rtc->max_user_freq / freq) - 1;
 676
 677         tmp |= S3C2443_TICNT_PART(val);
 678         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 679
 680         writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
 681
 682         writel(tmp, info->base + S3C2410_TICNT);
 683 }
 684
 685 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
 686 {
 687         unsigned int tmp = 0;
 688         int val;
 689
 690         tmp = readb(info->base + S3C2410_TICNT);
 691         tmp &= S3C2410_TICNT_ENABLE;
 692
 693         val = (info->rtc->max_user_freq / freq) - 1;
 694
 695         tmp |= S3C2443_TICNT_PART(val);
 696         writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
 697
 698         writel(tmp, info->base + S3C2410_TICNT);
 699 }
 700
 701 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
 702 {
 703         int val;
 704
 705         val = (info->rtc->max_user_freq / freq) - 1;
 706         writel(val, info->base + S3C2410_TICNT);
 707 }
 708
 709 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 710 {
 711         unsigned int ticnt;
 712
 713         ticnt = readb(info->base + S3C2410_TICNT);
 714         ticnt &= S3C2410_TICNT_ENABLE;
 715
 716         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 717 }
 718
 719 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
 720 {
 721         unsigned int con;
 722
 723         con = readw(info->base + S3C2410_RTCCON);
 724         con |= S3C2443_RTCCON_TICSEL;
 725         writew(con, info->base + S3C2410_RTCCON);
 726 }
 727
 728 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
 729 {
 730         unsigned int ticnt;
 731
 732         ticnt = readw(info->base + S3C2410_RTCCON);
 733         ticnt &= S3C64XX_RTCCON_TICEN;
 734
 735         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 736 }
 737
 738 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
 739 {
 740         info->ticnt_save = readb(info->base + S3C2410_TICNT);
 741 }
 742
 743 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
 744 {
 745         writeb(info->ticnt_save, info->base + S3C2410_TICNT);
 746 }
 747
 748 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
 749 {
 750         info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
 751         info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 752         info->ticnt_save = readl(info->base + S3C2410_TICNT);
 753 }
 754
 755 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
 756 {
 757         unsigned int con;
 758
 759         writel(info->ticnt_save, info->base + S3C2410_TICNT);
 760         if (info->ticnt_en_save) {
 761                 con = readw(info->base + S3C2410_RTCCON);
 762                 writew(con | info->ticnt_en_save,
 763                                 info->base + S3C2410_RTCCON);
 764         }
 765 }
 766
 767 static struct s3c_rtc_data const s3c2410_rtc_data = {
 768         .max_user_freq          = 128,
 769         .irq_handler            = s3c24xx_rtc_irq,
 770         .set_freq               = s3c2410_rtc_setfreq,
 771         .enable_tick            = s3c24xx_rtc_enable_tick,
 772         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 773         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 774         .enable                 = s3c24xx_rtc_enable,
 775         .disable                = s3c24xx_rtc_disable,
 776 };
 777
 778 static struct s3c_rtc_data const s3c2416_rtc_data = {
 779         .max_user_freq          = 32768,
 780         .irq_handler            = s3c24xx_rtc_irq,
 781         .set_freq               = s3c2416_rtc_setfreq,
 782         .enable_tick            = s3c24xx_rtc_enable_tick,
 783         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 784         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 785         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 786         .enable                 = s3c24xx_rtc_enable,
 787         .disable                = s3c24xx_rtc_disable,
 788 };
 789
 790 static struct s3c_rtc_data const s3c2443_rtc_data = {
 791         .max_user_freq          = 32768,
 792         .irq_handler            = s3c24xx_rtc_irq,
 793         .set_freq               = s3c2443_rtc_setfreq,
 794         .enable_tick            = s3c24xx_rtc_enable_tick,
 795         .select_tick_clk        = s3c2416_rtc_select_tick_clk,
 796         .save_tick_cnt          = s3c24xx_rtc_save_tick_cnt,
 797         .restore_tick_cnt       = s3c24xx_rtc_restore_tick_cnt,
 798         .enable                 = s3c24xx_rtc_enable,
 799         .disable                = s3c24xx_rtc_disable,
 800 };
 801
 802 static struct s3c_rtc_data const s3c6410_rtc_data = {
 803         .max_user_freq          = 32768,
 804         .needs_src_clk          = true,
 805         .irq_handler            = s3c6410_rtc_irq,
 806         .set_freq               = s3c6410_rtc_setfreq,
 807         .enable_tick            = s3c6410_rtc_enable_tick,
 808         .save_tick_cnt          = s3c6410_rtc_save_tick_cnt,
 809         .restore_tick_cnt       = s3c6410_rtc_restore_tick_cnt,
 810         .enable                 = s3c24xx_rtc_enable,
 811         .disable                = s3c6410_rtc_disable,
 812 };
 813
 814 static const struct of_device_id s3c_rtc_dt_match[] = {
 815         {
 816                 .compatible = "samsung,s3c2410-rtc",
 817                 .data = (void *)&s3c2410_rtc_data,
 818         }, {
 819                 .compatible = "samsung,s3c2416-rtc",
 820                 .data = (void *)&s3c2416_rtc_data,
 821         }, {
 822                 .compatible = "samsung,s3c2443-rtc",
 823                 .data = (void *)&s3c2443_rtc_data,
 824         }, {
 825                 .compatible = "samsung,s3c6410-rtc",
 826                 .data = (void *)&s3c6410_rtc_data,
 827         }, {
 828                 .compatible = "samsung,exynos3250-rtc",
 829                 .data = (void *)&s3c6410_rtc_data,
 830         },
 831         { /* sentinel */ },
 832 };
 833 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 834
 835 static struct platform_driver s3c_rtc_driver = {
 836         .probe          = s3c_rtc_probe,
 837         .remove         = s3c_rtc_remove,
 838         .driver         = {
 839                 .name   = "s3c-rtc",
 840                 .pm     = &s3c_rtc_pm_ops,
 841                 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
 842         },
 843 };
 844 module_platform_driver(s3c_rtc_driver);
 845
 846 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 847 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 848 MODULE_LICENSE("GPL");
 849 MODULE_ALIAS("platform:s3c2410-rtc");