drivers/rtc/rtc-sh.c

   1 /*
   2  * SuperH On-Chip RTC Support
   3  *
   4  * Copyright (C) 2006  Paul Mundt
   5  * Copyright (C) 2006  Jamie Lenehan
   6  *
   7  * Based on the old arch/sh/kernel/cpu/rtc.c by:
   8  *
   9  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
  10  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file "COPYING" in the main directory of this archive
  14  * for more details.
  15  */
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/bcd.h>
  19 #include <linux/rtc.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/io.h>
  26
  27 #define DRV_NAME        "sh-rtc"
  28 #define DRV_VERSION     "0.1.2"
  29
  30 #ifdef CONFIG_CPU_SH3
  31 #define rtc_reg_size            sizeof(u16)
  32 #define RTC_BIT_INVERTED        0       /* No bug on SH7708, SH7709A */
  33 #elif defined(CONFIG_CPU_SH4)
  34 #define rtc_reg_size            sizeof(u32)
  35 #define RTC_BIT_INVERTED        0x40    /* bug on SH7750, SH7750S */
  36 #endif
  37
  38 #define RTC_REG(r)      ((r) * rtc_reg_size)
  39
  40 #define R64CNT          RTC_REG(0)
  41
  42 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  43 #define RMINCNT         RTC_REG(2)      /* RTC min */
  44 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  45 #define RWKCNT          RTC_REG(4)      /* RTC week */
  46 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  47 #define RMONCNT         RTC_REG(6)      /* RTC month */
  48 #define RYRCNT          RTC_REG(7)      /* RTC year */
  49 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  50 #define RMINAR          RTC_REG(9)      /* ALARM min */
  51 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  52 #define RWKAR           RTC_REG(11)     /* ALARM week */
  53 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  54 #define RMONAR          RTC_REG(13)     /* ALARM month */
  55 #define RCR1            RTC_REG(14)     /* Control */
  56 #define RCR2            RTC_REG(15)     /* Control */
  57
  58 /* ALARM Bits - or with BCD encoded value */
  59 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  60
  61 /* RCR1 Bits */
  62 #define RCR1_CF         0x80    /* Carry Flag             */
  63 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  64 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  65 #define RCR1_AF         0x01    /* Alarm Flag             */
  66
  67 /* RCR2 Bits */
  68 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  69 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  70 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  71 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  72 #define RCR2_RESET      0x02    /* Reset bit               */
  73 #define RCR2_START      0x01    /* Start bit               */
  74
  75 struct sh_rtc {
  76         void __iomem *regbase;
  77         unsigned long regsize;
  78         struct resource *res;
  79         unsigned int alarm_irq, periodic_irq, carry_irq;
  80         struct rtc_device *rtc_dev;
  81         spinlock_t lock;
  82         int rearm_aie;
  83 };
  84
  85 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
  86 {
  87         struct platform_device *pdev = to_platform_device(dev_id);
  88         struct sh_rtc *rtc = platform_get_drvdata(pdev);
  89         unsigned int tmp, events = 0;
  90
  91         spin_lock(&rtc->lock);
  92
  93         tmp = readb(rtc->regbase + RCR1);
  94         tmp &= ~RCR1_CF;
  95
  96         if (rtc->rearm_aie) {
  97                 if (tmp & RCR1_AF)
  98                         tmp &= ~RCR1_AF;        /* try to clear AF again */
  99                 else {
 100                         tmp |= RCR1_AIE;        /* AF has cleared, rearm IRQ */
 101                         rtc->rearm_aie = 0;
 102                 }
 103         }
 104
 105         writeb(tmp, rtc->regbase + RCR1);
 106
 107         rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);
 108
 109         spin_unlock(&rtc->lock);
 110
 111         return IRQ_HANDLED;
 112 }
 113
 114 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 115 {
 116         struct platform_device *pdev = to_platform_device(dev_id);
 117         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 118         unsigned int tmp, events = 0;
 119
 120         spin_lock(&rtc->lock);
 121
 122         tmp = readb(rtc->regbase + RCR1);
 123
 124         /*
 125          * If AF is set then the alarm has triggered. If we clear AF while
 126          * the alarm time still matches the RTC time then AF will
 127          * immediately be set again, and if AIE is enabled then the alarm
 128          * interrupt will immediately be retrigger. So we clear AIE here
 129          * and use rtc->rearm_aie so that the carry interrupt will keep
 130          * trying to clear AF and once it stays cleared it'll re-enable
 131          * AIE.
 132          */
 133         if (tmp & RCR1_AF) {
 134                 events |= RTC_AF | RTC_IRQF;
 135
 136                 tmp &= ~(RCR1_AF|RCR1_AIE);
 137
 138                 writeb(tmp, rtc->regbase + RCR1);
 139
 140                 rtc->rearm_aie = 1;
 141
 142                 rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);
 143         }
 144
 145         spin_unlock(&rtc->lock);
 146         return IRQ_HANDLED;
 147 }
 148
 149 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 150 {
 151         struct platform_device *pdev = to_platform_device(dev_id);
 152         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 153
 154         spin_lock(&rtc->lock);
 155
 156         rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF | RTC_IRQF);
 157
 158         spin_unlock(&rtc->lock);
 159
 160         return IRQ_HANDLED;
 161 }
 162
 163 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 164 {
 165         struct sh_rtc *rtc = dev_get_drvdata(dev);
 166         unsigned int tmp;
 167
 168         spin_lock_irq(&rtc->lock);
 169
 170         tmp = readb(rtc->regbase + RCR2);
 171
 172         if (enable) {
 173                 tmp &= ~RCR2_PESMASK;
 174                 tmp |= RCR2_PEF | (2 << 4);
 175         } else
 176                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 177
 178         writeb(tmp, rtc->regbase + RCR2);
 179
 180         spin_unlock_irq(&rtc->lock);
 181 }
 182
 183 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 184 {
 185         struct sh_rtc *rtc = dev_get_drvdata(dev);
 186         unsigned int tmp;
 187
 188         spin_lock_irq(&rtc->lock);
 189
 190         tmp = readb(rtc->regbase + RCR1);
 191
 192         if (!enable) {
 193                 tmp &= ~RCR1_AIE;
 194                 rtc->rearm_aie = 0;
 195         } else if (rtc->rearm_aie == 0)
 196                 tmp |= RCR1_AIE;
 197
 198         writeb(tmp, rtc->regbase + RCR1);
 199
 200         spin_unlock_irq(&rtc->lock);
 201 }
 202
 203 static int sh_rtc_open(struct device *dev)
 204 {
 205         struct sh_rtc *rtc = dev_get_drvdata(dev);
 206         unsigned int tmp;
 207         int ret;
 208
 209         tmp = readb(rtc->regbase + RCR1);
 210         tmp &= ~RCR1_CF;
 211         tmp |= RCR1_CIE;
 212         writeb(tmp, rtc->regbase + RCR1);
 213
 214         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 215                           "sh-rtc period", dev);
 216         if (unlikely(ret)) {
 217                 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
 218                         ret, rtc->periodic_irq);
 219                 return ret;
 220         }
 221
 222         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 223                           "sh-rtc carry", dev);
 224         if (unlikely(ret)) {
 225                 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
 226                         ret, rtc->carry_irq);
 227                 free_irq(rtc->periodic_irq, dev);
 228                 goto err_bad_carry;
 229         }
 230
 231         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 232                           "sh-rtc alarm", dev);
 233         if (unlikely(ret)) {
 234                 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
 235                         ret, rtc->alarm_irq);
 236                 goto err_bad_alarm;
 237         }
 238
 239         return 0;
 240
 241 err_bad_alarm:
 242         free_irq(rtc->carry_irq, dev);
 243 err_bad_carry:
 244         free_irq(rtc->periodic_irq, dev);
 245
 246         return ret;
 247 }
 248
 249 static void sh_rtc_release(struct device *dev)
 250 {
 251         struct sh_rtc *rtc = dev_get_drvdata(dev);
 252
 253         sh_rtc_setpie(dev, 0);
 254         sh_rtc_setaie(dev, 0);
 255
 256         free_irq(rtc->periodic_irq, dev);
 257         free_irq(rtc->carry_irq, dev);
 258         free_irq(rtc->alarm_irq, dev);
 259 }
 260
 261 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 262 {
 263         struct sh_rtc *rtc = dev_get_drvdata(dev);
 264         unsigned int tmp;
 265
 266         tmp = readb(rtc->regbase + RCR1);
 267         seq_printf(seq, "carry_IRQ\t: %s\n",
 268                    (tmp & RCR1_CIE) ? "yes" : "no");
 269
 270         tmp = readb(rtc->regbase + RCR2);
 271         seq_printf(seq, "periodic_IRQ\t: %s\n",
 272                    (tmp & RCR2_PEF) ? "yes" : "no");
 273
 274         return 0;
 275 }
 276
 277 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 278 {
 279         unsigned int ret = -ENOIOCTLCMD;
 280
 281         switch (cmd) {
 282         case RTC_PIE_OFF:
 283         case RTC_PIE_ON:
 284                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 285                 ret = 0;
 286                 break;
 287         case RTC_AIE_OFF:
 288         case RTC_AIE_ON:
 289                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 290                 ret = 0;
 291                 break;
 292         }
 293
 294         return ret;
 295 }
 296
 297 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 298 {
 299         struct platform_device *pdev = to_platform_device(dev);
 300         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 301         unsigned int sec128, sec2, yr, yr100, cf_bit;
 302
 303         do {
 304                 unsigned int tmp;
 305
 306                 spin_lock_irq(&rtc->lock);
 307
 308                 tmp = readb(rtc->regbase + RCR1);
 309                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 310                 tmp |= RCR1_CIE;
 311                 writeb(tmp, rtc->regbase + RCR1);
 312
 313                 sec128 = readb(rtc->regbase + R64CNT);
 314
 315                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 316                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 317                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 318                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 319                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 320                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 321
 322 #if defined(CONFIG_CPU_SH4)
 323                 yr  = readw(rtc->regbase + RYRCNT);
 324                 yr100 = BCD2BIN(yr >> 8);
 325                 yr &= 0xff;
 326 #else
 327                 yr  = readb(rtc->regbase + RYRCNT);
 328                 yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 329 #endif
 330
 331                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 332
 333                 sec2 = readb(rtc->regbase + R64CNT);
 334                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 335
 336                 spin_unlock_irq(&rtc->lock);
 337         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 338
 339 #if RTC_BIT_INVERTED != 0
 340         if ((sec128 & RTC_BIT_INVERTED))
 341                 tm->tm_sec--;
 342 #endif
 343
 344         dev_dbg(&dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 345                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 346                 __FUNCTION__,
 347                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 348                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 349
 350         if (rtc_valid_tm(tm) < 0)
 351                 dev_err(dev, "invalid date\n");
 352
 353         return 0;
 354 }
 355
 356 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 357 {
 358         struct platform_device *pdev = to_platform_device(dev);
 359         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 360         unsigned int tmp;
 361         int year;
 362
 363         spin_lock_irq(&rtc->lock);
 364
 365         /* Reset pre-scaler & stop RTC */
 366         tmp = readb(rtc->regbase + RCR2);
 367         tmp |= RCR2_RESET;
 368         writeb(tmp, rtc->regbase + RCR2);
 369
 370         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 371         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 372         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 373         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 374         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 375         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 376
 377 #ifdef CONFIG_CPU_SH3
 378         year = tm->tm_year % 100;
 379         writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 380 #else
 381         year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 382                 BIN2BCD(tm->tm_year % 100);
 383         writew(year, rtc->regbase + RYRCNT);
 384 #endif
 385
 386         /* Start RTC */
 387         tmp = readb(rtc->regbase + RCR2);
 388         tmp &= ~RCR2_RESET;
 389         tmp |= RCR2_RTCEN | RCR2_START;
 390         writeb(tmp, rtc->regbase + RCR2);
 391
 392         spin_unlock_irq(&rtc->lock);
 393
 394         return 0;
 395 }
 396
 397 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 398 {
 399         unsigned int byte;
 400         int value = 0xff;       /* return 0xff for ignored values */
 401
 402         byte = readb(rtc->regbase + reg_off);
 403         if (byte & AR_ENB) {
 404                 byte &= ~AR_ENB;        /* strip the enable bit */
 405                 value = BCD2BIN(byte);
 406         }
 407
 408         return value;
 409 }
 410
 411 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 412 {
 413         struct platform_device *pdev = to_platform_device(dev);
 414         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 415         struct rtc_time* tm = &wkalrm->time;
 416
 417         spin_lock_irq(&rtc->lock);
 418
 419         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 420         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 421         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 422         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 423         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 424         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 425         if (tm->tm_mon > 0)
 426                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 427         tm->tm_year     = 0xffff;
 428
 429         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 430
 431         spin_unlock_irq(&rtc->lock);
 432
 433         return 0;
 434 }
 435
 436 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 437                                             int value, int reg_off)
 438 {
 439         /* < 0 for a value that is ignored */
 440         if (value < 0)
 441                 writeb(0, rtc->regbase + reg_off);
 442         else
 443                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 444 }
 445
 446 static int sh_rtc_check_alarm(struct rtc_time* tm)
 447 {
 448         /*
 449          * The original rtc says anything > 0xc0 is "don't care" or "match
 450          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 451          * The original rtc doesn't support years - some things use -1 and
 452          * some 0xffff. We use -1 to make out tests easier.
 453          */
 454         if (tm->tm_year == 0xffff)
 455                 tm->tm_year = -1;
 456         if (tm->tm_mon >= 0xff)
 457                 tm->tm_mon = -1;
 458         if (tm->tm_mday >= 0xff)
 459                 tm->tm_mday = -1;
 460         if (tm->tm_wday >= 0xff)
 461                 tm->tm_wday = -1;
 462         if (tm->tm_hour >= 0xff)
 463                 tm->tm_hour = -1;
 464         if (tm->tm_min >= 0xff)
 465                 tm->tm_min = -1;
 466         if (tm->tm_sec >= 0xff)
 467                 tm->tm_sec = -1;
 468
 469         if (tm->tm_year > 9999 ||
 470                 tm->tm_mon >= 12 ||
 471                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 472                 tm->tm_wday >= 7 ||
 473                 tm->tm_hour >= 24 ||
 474                 tm->tm_min >= 60 ||
 475                 tm->tm_sec >= 60)
 476                 return -EINVAL;
 477
 478         return 0;
 479 }
 480
 481 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 482 {
 483         struct platform_device *pdev = to_platform_device(dev);
 484         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 485         unsigned int rcr1;
 486         struct rtc_time *tm = &wkalrm->time;
 487         int mon, err;
 488
 489         err = sh_rtc_check_alarm(tm);
 490         if (unlikely(err < 0))
 491                 return err;
 492
 493         spin_lock_irq(&rtc->lock);
 494
 495         /* disable alarm interrupt and clear the alarm flag */
 496         rcr1 = readb(rtc->regbase + RCR1);
 497         rcr1 &= ~(RCR1_AF|RCR1_AIE);
 498         writeb(rcr1, rtc->regbase + RCR1);
 499
 500         rtc->rearm_aie = 0;
 501
 502         /* set alarm time */
 503         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 504         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 505         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 506         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 507         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 508         mon = tm->tm_mon;
 509         if (mon >= 0)
 510                 mon += 1;
 511         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 512
 513         if (wkalrm->enabled) {
 514                 rcr1 |= RCR1_AIE;
 515                 writeb(rcr1, rtc->regbase + RCR1);
 516         }
 517
 518         spin_unlock_irq(&rtc->lock);
 519
 520         return 0;
 521 }
 522
 523 static struct rtc_class_ops sh_rtc_ops = {
 524         .open           = sh_rtc_open,
 525         .release        = sh_rtc_release,
 526         .ioctl          = sh_rtc_ioctl,
 527         .read_time      = sh_rtc_read_time,
 528         .set_time       = sh_rtc_set_time,
 529         .read_alarm     = sh_rtc_read_alarm,
 530         .set_alarm      = sh_rtc_set_alarm,
 531         .proc           = sh_rtc_proc,
 532 };
 533
 534 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 535 {
 536         struct sh_rtc *rtc;
 537         struct resource *res;
 538         int ret = -ENOENT;
 539
 540         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 541         if (unlikely(!rtc))
 542                 return -ENOMEM;
 543
 544         spin_lock_init(&rtc->lock);
 545
 546         rtc->periodic_irq = platform_get_irq(pdev, 0);
 547         if (unlikely(rtc->periodic_irq < 0)) {
 548                 dev_err(&pdev->dev, "No IRQ for period\n");
 549                 goto err_badres;
 550         }
 551
 552         rtc->carry_irq = platform_get_irq(pdev, 1);
 553         if (unlikely(rtc->carry_irq < 0)) {
 554                 dev_err(&pdev->dev, "No IRQ for carry\n");
 555                 goto err_badres;
 556         }
 557
 558         rtc->alarm_irq = platform_get_irq(pdev, 2);
 559         if (unlikely(rtc->alarm_irq < 0)) {
 560                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 561                 goto err_badres;
 562         }
 563
 564         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 565         if (unlikely(res == NULL)) {
 566                 dev_err(&pdev->dev, "No IO resource\n");
 567                 goto err_badres;
 568         }
 569
 570         rtc->regsize = res->end - res->start + 1;
 571
 572         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 573         if (unlikely(!rtc->res)) {
 574                 ret = -EBUSY;
 575                 goto err_badres;
 576         }
 577
 578         rtc->regbase = (void __iomem *)rtc->res->start;
 579         if (unlikely(!rtc->regbase)) {
 580                 ret = -EINVAL;
 581                 goto err_badmap;
 582         }
 583
 584         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 585                                            &sh_rtc_ops, THIS_MODULE);
 586         if (IS_ERR(rtc)) {
 587                 ret = PTR_ERR(rtc->rtc_dev);
 588                 goto err_badmap;
 589         }
 590
 591         platform_set_drvdata(pdev, rtc);
 592
 593         return 0;
 594
 595 err_badmap:
 596         release_resource(rtc->res);
 597 err_badres:
 598         kfree(rtc);
 599
 600         return ret;
 601 }
 602
 603 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 604 {
 605         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 606
 607         if (likely(rtc->rtc_dev))
 608                 rtc_device_unregister(rtc->rtc_dev);
 609
 610         sh_rtc_setpie(&pdev->dev, 0);
 611         sh_rtc_setaie(&pdev->dev, 0);
 612
 613         release_resource(rtc->res);
 614
 615         platform_set_drvdata(pdev, NULL);
 616
 617         kfree(rtc);
 618
 619         return 0;
 620 }
 621 static struct platform_driver sh_rtc_platform_driver = {
 622         .driver         = {
 623                 .name   = DRV_NAME,
 624                 .owner  = THIS_MODULE,
 625         },
 626         .probe          = sh_rtc_probe,
 627         .remove         = __devexit_p(sh_rtc_remove),
 628 };
 629
 630 static int __init sh_rtc_init(void)
 631 {
 632         return platform_driver_register(&sh_rtc_platform_driver);
 633 }
 634
 635 static void __exit sh_rtc_exit(void)
 636 {
 637         platform_driver_unregister(&sh_rtc_platform_driver);
 638 }
 639
 640 module_init(sh_rtc_init);
 641 module_exit(sh_rtc_exit);
 642
 643 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 644 MODULE_VERSION(DRV_VERSION);
 645 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
 646 MODULE_LICENSE("GPL");