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
  30 #include <mach/hardware.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <plat/regs-rtc.h>
  35
  36 enum s3c_cpu_type {
  37         TYPE_S3C2410,
  38         TYPE_S3C2416,
  39         TYPE_S3C2443,
  40         TYPE_S3C64XX,
  41 };
  42
  43 /* I have yet to find an S3C implementation with more than one
  44  * of these rtc blocks in */
  45
  46 static struct resource *s3c_rtc_mem;
  47
  48 static struct clk *rtc_clk;
  49 static void __iomem *s3c_rtc_base;
  50 static int s3c_rtc_alarmno = NO_IRQ;
  51 static int s3c_rtc_tickno  = NO_IRQ;
  52 static bool wake_en;
  53 static enum s3c_cpu_type s3c_rtc_cpu_type;
  54
  55 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
  56
  57 static void s3c_rtc_alarm_clk_enable(bool enable)
  58 {
  59         static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
  60         static bool alarm_clk_enabled;
  61         unsigned long irq_flags;
  62
  63         spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
  64         if (enable) {
  65                 if (!alarm_clk_enabled) {
  66                         clk_enable(rtc_clk);
  67                         alarm_clk_enabled = true;
  68                 }
  69         } else {
  70                 if (alarm_clk_enabled) {
  71                         clk_disable(rtc_clk);
  72                         alarm_clk_enabled = false;
  73                 }
  74         }
  75         spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
  76 }
  77
  78 /* IRQ Handlers */
  79
  80 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
  81 {
  82         struct rtc_device *rdev = id;
  83
  84         clk_enable(rtc_clk);
  85         rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
  86
  87         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  88                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
  89
  90         clk_disable(rtc_clk);
  91
  92         s3c_rtc_alarm_clk_enable(false);
  93
  94         return IRQ_HANDLED;
  95 }
  96
  97 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
  98 {
  99         struct rtc_device *rdev = id;
 100
 101         clk_enable(rtc_clk);
 102         rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
 103
 104         if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 105                 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
 106
 107         clk_disable(rtc_clk);
 108         return IRQ_HANDLED;
 109 }
 110
 111 /* Update control registers */
 112 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 113 {
 114         unsigned int tmp;
 115
 116         pr_debug("%s: aie=%d\n", __func__, enabled);
 117
 118         clk_enable(rtc_clk);
 119         tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 120
 121         if (enabled)
 122                 tmp |= S3C2410_RTCALM_ALMEN;
 123
 124         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
 125         clk_disable(rtc_clk);
 126
 127         s3c_rtc_alarm_clk_enable(enabled);
 128
 129         return 0;
 130 }
 131
 132 static int s3c_rtc_setfreq(struct device *dev, int freq)
 133 {
 134         struct platform_device *pdev = to_platform_device(dev);
 135         struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 136         unsigned int tmp = 0;
 137         int val;
 138
 139         if (!is_power_of_2(freq))
 140                 return -EINVAL;
 141
 142         clk_enable(rtc_clk);
 143         spin_lock_irq(&s3c_rtc_pie_lock);
 144
 145         if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
 146                 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
 147                 tmp &= S3C2410_TICNT_ENABLE;
 148         }
 149
 150         val = (rtc_dev->max_user_freq / freq) - 1;
 151
 152         if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
 153                 tmp |= S3C2443_TICNT_PART(val);
 154                 writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);
 155
 156                 if (s3c_rtc_cpu_type == TYPE_S3C2416)
 157                         writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
 158         } else {
 159                 tmp |= val;
 160         }
 161
 162         writel(tmp, s3c_rtc_base + S3C2410_TICNT);
 163         spin_unlock_irq(&s3c_rtc_pie_lock);
 164         clk_disable(rtc_clk);
 165
 166         return 0;
 167 }
 168
 169 /* Time read/write */
 170
 171 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 172 {
 173         unsigned int have_retried = 0;
 174         void __iomem *base = s3c_rtc_base;
 175
 176         clk_enable(rtc_clk);
 177  retry_get_time:
 178         rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
 179         rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
 180         rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
 181         rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
 182         rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
 183         rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);
 184
 185         /* the only way to work out wether the system was mid-update
 186          * when we read it is to check the second counter, and if it
 187          * is zero, then we re-try the entire read
 188          */
 189
 190         if (rtc_tm->tm_sec == 0 && !have_retried) {
 191                 have_retried = 1;
 192                 goto retry_get_time;
 193         }
 194
 195         rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
 196         rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
 197         rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
 198         rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
 199         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
 200         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 201
 202         rtc_tm->tm_year += 100;
 203
 204         pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
 205                  1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 206                  rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 207
 208         rtc_tm->tm_mon -= 1;
 209
 210         clk_disable(rtc_clk);
 211         return rtc_valid_tm(rtc_tm);
 212 }
 213
 214 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 215 {
 216         void __iomem *base = s3c_rtc_base;
 217         int year = tm->tm_year - 100;
 218
 219         pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
 220                  1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
 221                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 222
 223         /* we get around y2k by simply not supporting it */
 224
 225         if (year < 0 || year >= 100) {
 226                 dev_err(dev, "rtc only supports 100 years\n");
 227                 return -EINVAL;
 228         }
 229
 230         clk_enable(rtc_clk);
 231         writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
 232         writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
 233         writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
 234         writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
 235         writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
 236         writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
 237         clk_disable(rtc_clk);
 238
 239         return 0;
 240 }
 241
 242 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 243 {
 244         struct rtc_time *alm_tm = &alrm->time;
 245         void __iomem *base = s3c_rtc_base;
 246         unsigned int alm_en;
 247
 248         clk_enable(rtc_clk);
 249         alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
 250         alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
 251         alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
 252         alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
 253         alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
 254         alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
 255
 256         alm_en = readb(base + S3C2410_RTCALM);
 257
 258         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 259
 260         pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 261                  alm_en,
 262                  1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 263                  alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 264
 265
 266         /* decode the alarm enable field */
 267
 268         if (alm_en & S3C2410_RTCALM_SECEN)
 269                 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
 270         else
 271                 alm_tm->tm_sec = -1;
 272
 273         if (alm_en & S3C2410_RTCALM_MINEN)
 274                 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
 275         else
 276                 alm_tm->tm_min = -1;
 277
 278         if (alm_en & S3C2410_RTCALM_HOUREN)
 279                 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
 280         else
 281                 alm_tm->tm_hour = -1;
 282
 283         if (alm_en & S3C2410_RTCALM_DAYEN)
 284                 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
 285         else
 286                 alm_tm->tm_mday = -1;
 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         } else {
 292                 alm_tm->tm_mon = -1;
 293         }
 294
 295         if (alm_en & S3C2410_RTCALM_YEAREN)
 296                 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
 297         else
 298                 alm_tm->tm_year = -1;
 299
 300         clk_disable(rtc_clk);
 301         return 0;
 302 }
 303
 304 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 305 {
 306         struct rtc_time *tm = &alrm->time;
 307         void __iomem *base = s3c_rtc_base;
 308         unsigned int alrm_en;
 309
 310         clk_enable(rtc_clk);
 311         pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
 312                  alrm->enabled,
 313                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 314                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 315
 316         alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 317         writeb(0x00, base + S3C2410_RTCALM);
 318
 319         if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
 320                 alrm_en |= S3C2410_RTCALM_SECEN;
 321                 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
 322         }
 323
 324         if (tm->tm_min < 60 && tm->tm_min >= 0) {
 325                 alrm_en |= S3C2410_RTCALM_MINEN;
 326                 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
 327         }
 328
 329         if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
 330                 alrm_en |= S3C2410_RTCALM_HOUREN;
 331                 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
 332         }
 333
 334         pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 335
 336         writeb(alrm_en, base + S3C2410_RTCALM);
 337
 338         s3c_rtc_setaie(dev, alrm->enabled);
 339
 340         clk_disable(rtc_clk);
 341         return 0;
 342 }
 343
 344 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 345 {
 346         unsigned int ticnt;
 347
 348         clk_enable(rtc_clk);
 349         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 350                 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
 351                 ticnt &= S3C64XX_RTCCON_TICEN;
 352         } else {
 353                 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
 354                 ticnt &= S3C2410_TICNT_ENABLE;
 355         }
 356
 357         seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
 358         clk_disable(rtc_clk);
 359         return 0;
 360 }
 361
 362 static const struct rtc_class_ops s3c_rtcops = {
 363         .read_time      = s3c_rtc_gettime,
 364         .set_time       = s3c_rtc_settime,
 365         .read_alarm     = s3c_rtc_getalarm,
 366         .set_alarm      = s3c_rtc_setalarm,
 367         .proc           = s3c_rtc_proc,
 368         .alarm_irq_enable = s3c_rtc_setaie,
 369 };
 370
 371 static void s3c_rtc_enable(struct platform_device *pdev, int en)
 372 {
 373         void __iomem *base = s3c_rtc_base;
 374         unsigned int tmp;
 375
 376         if (s3c_rtc_base == NULL)
 377                 return;
 378
 379         clk_enable(rtc_clk);
 380         if (!en) {
 381                 tmp = readw(base + S3C2410_RTCCON);
 382                 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
 383                         tmp &= ~S3C64XX_RTCCON_TICEN;
 384                 tmp &= ~S3C2410_RTCCON_RTCEN;
 385                 writew(tmp, base + S3C2410_RTCCON);
 386
 387                 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
 388                         tmp = readb(base + S3C2410_TICNT);
 389                         tmp &= ~S3C2410_TICNT_ENABLE;
 390                         writeb(tmp, base + S3C2410_TICNT);
 391                 }
 392         } else {
 393                 /* re-enable the device, and check it is ok */
 394
 395                 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
 396                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 397
 398                         tmp = readw(base + S3C2410_RTCCON);
 399                         writew(tmp | S3C2410_RTCCON_RTCEN,
 400                                 base + S3C2410_RTCCON);
 401                 }
 402
 403                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
 404                         dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 405
 406                         tmp = readw(base + S3C2410_RTCCON);
 407                         writew(tmp & ~S3C2410_RTCCON_CNTSEL,
 408                                 base + S3C2410_RTCCON);
 409                 }
 410
 411                 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
 412                         dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 413
 414                         tmp = readw(base + S3C2410_RTCCON);
 415                         writew(tmp & ~S3C2410_RTCCON_CLKRST,
 416                                 base + S3C2410_RTCCON);
 417                 }
 418         }
 419         clk_disable(rtc_clk);
 420 }
 421
 422 static int __devexit s3c_rtc_remove(struct platform_device *dev)
 423 {
 424         struct rtc_device *rtc = platform_get_drvdata(dev);
 425
 426         free_irq(s3c_rtc_alarmno, rtc);
 427         free_irq(s3c_rtc_tickno, rtc);
 428
 429         platform_set_drvdata(dev, NULL);
 430         rtc_device_unregister(rtc);
 431
 432         s3c_rtc_setaie(&dev->dev, 0);
 433
 434         clk_put(rtc_clk);
 435         rtc_clk = NULL;
 436
 437         iounmap(s3c_rtc_base);
 438         release_resource(s3c_rtc_mem);
 439         kfree(s3c_rtc_mem);
 440
 441         return 0;
 442 }
 443
 444 static const struct of_device_id s3c_rtc_dt_match[];
 445
 446 static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
 447 {
 448 #ifdef CONFIG_OF
 449         if (pdev->dev.of_node) {
 450                 const struct of_device_id *match;
 451                 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 452                 return match->data;
 453         }
 454 #endif
 455         return platform_get_device_id(pdev)->driver_data;
 456 }
 457
 458 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 459 {
 460         struct rtc_device *rtc;
 461         struct rtc_time rtc_tm;
 462         struct resource *res;
 463         int ret;
 464         int tmp;
 465
 466         pr_debug("%s: probe=%p\n", __func__, pdev);
 467
 468         /* find the IRQs */
 469
 470         s3c_rtc_tickno = platform_get_irq(pdev, 1);
 471         if (s3c_rtc_tickno < 0) {
 472                 dev_err(&pdev->dev, "no irq for rtc tick\n");
 473                 return -ENOENT;
 474         }
 475
 476         s3c_rtc_alarmno = platform_get_irq(pdev, 0);
 477         if (s3c_rtc_alarmno < 0) {
 478                 dev_err(&pdev->dev, "no irq for alarm\n");
 479                 return -ENOENT;
 480         }
 481
 482         pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
 483                  s3c_rtc_tickno, s3c_rtc_alarmno);
 484
 485         /* get the memory region */
 486
 487         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 488         if (res == NULL) {
 489                 dev_err(&pdev->dev, "failed to get memory region resource\n");
 490                 return -ENOENT;
 491         }
 492
 493         s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
 494                                          pdev->name);
 495
 496         if (s3c_rtc_mem == NULL) {
 497                 dev_err(&pdev->dev, "failed to reserve memory region\n");
 498                 ret = -ENOENT;
 499                 goto err_nores;
 500         }
 501
 502         s3c_rtc_base = ioremap(res->start, resource_size(res));
 503         if (s3c_rtc_base == NULL) {
 504                 dev_err(&pdev->dev, "failed ioremap()\n");
 505                 ret = -EINVAL;
 506                 goto err_nomap;
 507         }
 508
 509         rtc_clk = clk_get(&pdev->dev, "rtc");
 510         if (IS_ERR(rtc_clk)) {
 511                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
 512                 ret = PTR_ERR(rtc_clk);
 513                 rtc_clk = NULL;
 514                 goto err_clk;
 515         }
 516
 517         clk_enable(rtc_clk);
 518
 519         /* check to see if everything is setup correctly */
 520
 521         s3c_rtc_enable(pdev, 1);
 522
 523         pr_debug("s3c2410_rtc: RTCCON=%02x\n",
 524                  readw(s3c_rtc_base + S3C2410_RTCCON));
 525
 526         device_init_wakeup(&pdev->dev, 1);
 527
 528         /* register RTC and exit */
 529
 530         rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
 531                                   THIS_MODULE);
 532
 533         if (IS_ERR(rtc)) {
 534                 dev_err(&pdev->dev, "cannot attach rtc\n");
 535                 ret = PTR_ERR(rtc);
 536                 goto err_nortc;
 537         }
 538
 539         s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);
 540
 541         /* Check RTC Time */
 542
 543         s3c_rtc_gettime(NULL, &rtc_tm);
 544
 545         if (rtc_valid_tm(&rtc_tm)) {
 546                 rtc_tm.tm_year  = 100;
 547                 rtc_tm.tm_mon   = 0;
 548                 rtc_tm.tm_mday  = 1;
 549                 rtc_tm.tm_hour  = 0;
 550                 rtc_tm.tm_min   = 0;
 551                 rtc_tm.tm_sec   = 0;
 552
 553                 s3c_rtc_settime(NULL, &rtc_tm);
 554
 555                 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
 556         }
 557
 558         if (s3c_rtc_cpu_type != TYPE_S3C2410)
 559                 rtc->max_user_freq = 32768;
 560         else
 561                 rtc->max_user_freq = 128;
 562
 563         if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
 564                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 565                 tmp |= S3C2443_RTCCON_TICSEL;
 566                 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
 567         }
 568
 569         platform_set_drvdata(pdev, rtc);
 570
 571         s3c_rtc_setfreq(&pdev->dev, 1);
 572
 573         ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
 574                           0,  "s3c2410-rtc alarm", rtc);
 575         if (ret) {
 576                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
 577                 goto err_alarm_irq;
 578         }
 579
 580         ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
 581                           0,  "s3c2410-rtc tick", rtc);
 582         if (ret) {
 583                 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
 584                 free_irq(s3c_rtc_alarmno, rtc);
 585                 goto err_tick_irq;
 586         }
 587
 588         clk_disable(rtc_clk);
 589
 590         return 0;
 591
 592  err_tick_irq:
 593         free_irq(s3c_rtc_alarmno, rtc);
 594
 595  err_alarm_irq:
 596         platform_set_drvdata(pdev, NULL);
 597         rtc_device_unregister(rtc);
 598
 599  err_nortc:
 600         s3c_rtc_enable(pdev, 0);
 601         clk_disable(rtc_clk);
 602         clk_put(rtc_clk);
 603
 604  err_clk:
 605         iounmap(s3c_rtc_base);
 606
 607  err_nomap:
 608         release_resource(s3c_rtc_mem);
 609
 610  err_nores:
 611         return ret;
 612 }
 613
 614 #ifdef CONFIG_PM
 615
 616 /* RTC Power management control */
 617
 618 static int ticnt_save, ticnt_en_save;
 619
 620 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 621 {
 622         clk_enable(rtc_clk);
 623         /* save TICNT for anyone using periodic interrupts */
 624         ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
 625         if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
 626                 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
 627                 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
 628         }
 629         s3c_rtc_enable(pdev, 0);
 630
 631         if (device_may_wakeup(&pdev->dev) && !wake_en) {
 632                 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
 633                         wake_en = true;
 634                 else
 635                         dev_err(&pdev->dev, "enable_irq_wake failed\n");
 636         }
 637         clk_disable(rtc_clk);
 638
 639         return 0;
 640 }
 641
 642 static int s3c_rtc_resume(struct platform_device *pdev)
 643 {
 644         unsigned int tmp;
 645
 646         clk_enable(rtc_clk);
 647         s3c_rtc_enable(pdev, 1);
 648         writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
 649         if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
 650                 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
 651                 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
 652         }
 653
 654         if (device_may_wakeup(&pdev->dev) && wake_en) {
 655                 disable_irq_wake(s3c_rtc_alarmno);
 656                 wake_en = false;
 657         }
 658         clk_disable(rtc_clk);
 659
 660         return 0;
 661 }
 662 #else
 663 #define s3c_rtc_suspend NULL
 664 #define s3c_rtc_resume  NULL
 665 #endif
 666
 667 #ifdef CONFIG_OF
 668 static const struct of_device_id s3c_rtc_dt_match[] = {
 669         {
 670                 .compatible = "samsung,s3c2410-rtc"
 671                 .data = TYPE_S3C2410,
 672         }, {
 673                 .compatible = "samsung,s3c2416-rtc"
 674                 .data = TYPE_S3C2416,
 675         }, {
 676                 .compatible = "samsung,s3c2443-rtc"
 677                 .data = TYPE_S3C2443,
 678         }, {
 679                 .compatible = "samsung,s3c6410-rtc"
 680                 .data = TYPE_S3C64XX,
 681         },
 682         {},
 683 };
 684 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
 685 #else
 686 #define s3c_rtc_dt_match NULL
 687 #endif
 688
 689 static struct platform_device_id s3c_rtc_driver_ids[] = {
 690         {
 691                 .name           = "s3c2410-rtc",
 692                 .driver_data    = TYPE_S3C2410,
 693         }, {
 694                 .name           = "s3c2416-rtc",
 695                 .driver_data    = TYPE_S3C2416,
 696         }, {
 697                 .name           = "s3c2443-rtc",
 698                 .driver_data    = TYPE_S3C2443,
 699         }, {
 700                 .name           = "s3c64xx-rtc",
 701                 .driver_data    = TYPE_S3C64XX,
 702         },
 703         { }
 704 };
 705
 706 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
 707
 708 static struct platform_driver s3c_rtc_driver = {
 709         .probe          = s3c_rtc_probe,
 710         .remove         = __devexit_p(s3c_rtc_remove),
 711         .suspend        = s3c_rtc_suspend,
 712         .resume         = s3c_rtc_resume,
 713         .id_table       = s3c_rtc_driver_ids,
 714         .driver         = {
 715                 .name   = "s3c-rtc",
 716                 .owner  = THIS_MODULE,
 717                 .of_match_table = s3c_rtc_dt_match,
 718         },
 719 };
 720
 721 module_platform_driver(s3c_rtc_driver);
 722
 723 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
 724 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 725 MODULE_LICENSE("GPL");
 726 MODULE_ALIAS("platform:s3c2410-rtc");