drivers/rtc/rtc-sh.c

   1 /*
   2  * SuperH On-Chip RTC Support
   3  *
   4  * Copyright (C) 2006, 2007  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 #include <asm/rtc.h>
  27
  28 #define DRV_NAME        "sh-rtc"
  29 #define DRV_VERSION     "0.1.4"
  30
  31 #ifdef CONFIG_CPU_SH3
  32 #define rtc_reg_size            sizeof(u16)
  33 #define RTC_BIT_INVERTED        0       /* No bug on SH7708, SH7709A */
  34 #define RTC_DEF_CAPABILITIES    0UL
  35 #elif defined(CONFIG_CPU_SH4)
  36 #define rtc_reg_size            sizeof(u32)
  37 #define RTC_BIT_INVERTED        0x40    /* bug on SH7750, SH7750S */
  38 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
  39 #elif defined(CONFIG_CPU_SH5)
  40 #define rtc_reg_size            sizeof(u32)
  41 #define RTC_BIT_INVERTED        0       /* The SH-5 RTC is surprisingly sane! */
  42 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
  43 #endif
  44
  45 #define RTC_REG(r)      ((r) * rtc_reg_size)
  46
  47 #define R64CNT          RTC_REG(0)
  48
  49 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  50 #define RMINCNT         RTC_REG(2)      /* RTC min */
  51 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  52 #define RWKCNT          RTC_REG(4)      /* RTC week */
  53 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  54 #define RMONCNT         RTC_REG(6)      /* RTC month */
  55 #define RYRCNT          RTC_REG(7)      /* RTC year */
  56 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  57 #define RMINAR          RTC_REG(9)      /* ALARM min */
  58 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  59 #define RWKAR           RTC_REG(11)     /* ALARM week */
  60 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  61 #define RMONAR          RTC_REG(13)     /* ALARM month */
  62 #define RCR1            RTC_REG(14)     /* Control */
  63 #define RCR2            RTC_REG(15)     /* Control */
  64
  65 /* ALARM Bits - or with BCD encoded value */
  66 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  67
  68 /* RCR1 Bits */
  69 #define RCR1_CF         0x80    /* Carry Flag             */
  70 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  71 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  72 #define RCR1_AF         0x01    /* Alarm Flag             */
  73
  74 /* RCR2 Bits */
  75 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  76 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  77 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  78 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  79 #define RCR2_RESET      0x02    /* Reset bit               */
  80 #define RCR2_START      0x01    /* Start bit               */
  81
  82 struct sh_rtc {
  83         void __iomem *regbase;
  84         unsigned long regsize;
  85         struct resource *res;
  86         unsigned int alarm_irq, periodic_irq, carry_irq;
  87         struct rtc_device *rtc_dev;
  88         spinlock_t lock;
  89         int rearm_aie;
  90         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
  91 };
  92
  93 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
  94 {
  95         struct platform_device *pdev = to_platform_device(dev_id);
  96         struct sh_rtc *rtc = platform_get_drvdata(pdev);
  97         unsigned int tmp, events = 0;
  98
  99         spin_lock(&rtc->lock);
 100
 101         tmp = readb(rtc->regbase + RCR1);
 102         tmp &= ~RCR1_CF;
 103
 104         if (rtc->rearm_aie) {
 105                 if (tmp & RCR1_AF)
 106                         tmp &= ~RCR1_AF;        /* try to clear AF again */
 107                 else {
 108                         tmp |= RCR1_AIE;        /* AF has cleared, rearm IRQ */
 109                         rtc->rearm_aie = 0;
 110                 }
 111         }
 112
 113         writeb(tmp, rtc->regbase + RCR1);
 114
 115         rtc_update_irq(rtc->rtc_dev, 1, events);
 116
 117         spin_unlock(&rtc->lock);
 118
 119         return IRQ_HANDLED;
 120 }
 121
 122 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 123 {
 124         struct platform_device *pdev = to_platform_device(dev_id);
 125         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 126         unsigned int tmp, events = 0;
 127
 128         spin_lock(&rtc->lock);
 129
 130         tmp = readb(rtc->regbase + RCR1);
 131
 132         /*
 133          * If AF is set then the alarm has triggered. If we clear AF while
 134          * the alarm time still matches the RTC time then AF will
 135          * immediately be set again, and if AIE is enabled then the alarm
 136          * interrupt will immediately be retrigger. So we clear AIE here
 137          * and use rtc->rearm_aie so that the carry interrupt will keep
 138          * trying to clear AF and once it stays cleared it'll re-enable
 139          * AIE.
 140          */
 141         if (tmp & RCR1_AF) {
 142                 events |= RTC_AF | RTC_IRQF;
 143
 144                 tmp &= ~(RCR1_AF|RCR1_AIE);
 145
 146                 writeb(tmp, rtc->regbase + RCR1);
 147
 148                 rtc->rearm_aie = 1;
 149
 150                 rtc_update_irq(rtc->rtc_dev, 1, events);
 151         }
 152
 153         spin_unlock(&rtc->lock);
 154         return IRQ_HANDLED;
 155 }
 156
 157 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 158 {
 159         struct platform_device *pdev = to_platform_device(dev_id);
 160         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 161
 162         spin_lock(&rtc->lock);
 163
 164         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 165
 166         spin_unlock(&rtc->lock);
 167
 168         return IRQ_HANDLED;
 169 }
 170
 171 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 172 {
 173         struct sh_rtc *rtc = dev_get_drvdata(dev);
 174         unsigned int tmp;
 175
 176         spin_lock_irq(&rtc->lock);
 177
 178         tmp = readb(rtc->regbase + RCR2);
 179
 180         if (enable) {
 181                 tmp &= ~RCR2_PESMASK;
 182                 tmp |= RCR2_PEF | (2 << 4);
 183         } else
 184                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 185
 186         writeb(tmp, rtc->regbase + RCR2);
 187
 188         spin_unlock_irq(&rtc->lock);
 189 }
 190
 191 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 192 {
 193         struct sh_rtc *rtc = dev_get_drvdata(dev);
 194         unsigned int tmp;
 195
 196         spin_lock_irq(&rtc->lock);
 197
 198         tmp = readb(rtc->regbase + RCR1);
 199
 200         if (!enable) {
 201                 tmp &= ~RCR1_AIE;
 202                 rtc->rearm_aie = 0;
 203         } else if (rtc->rearm_aie == 0)
 204                 tmp |= RCR1_AIE;
 205
 206         writeb(tmp, rtc->regbase + RCR1);
 207
 208         spin_unlock_irq(&rtc->lock);
 209 }
 210
 211 static int sh_rtc_open(struct device *dev)
 212 {
 213         struct sh_rtc *rtc = dev_get_drvdata(dev);
 214         unsigned int tmp;
 215         int ret;
 216
 217         tmp = readb(rtc->regbase + RCR1);
 218         tmp &= ~RCR1_CF;
 219         tmp |= RCR1_CIE;
 220         writeb(tmp, rtc->regbase + RCR1);
 221
 222         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 223                           "sh-rtc period", dev);
 224         if (unlikely(ret)) {
 225                 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
 226                         ret, rtc->periodic_irq);
 227                 return ret;
 228         }
 229
 230         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 231                           "sh-rtc carry", dev);
 232         if (unlikely(ret)) {
 233                 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
 234                         ret, rtc->carry_irq);
 235                 free_irq(rtc->periodic_irq, dev);
 236                 goto err_bad_carry;
 237         }
 238
 239         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 240                           "sh-rtc alarm", dev);
 241         if (unlikely(ret)) {
 242                 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
 243                         ret, rtc->alarm_irq);
 244                 goto err_bad_alarm;
 245         }
 246
 247         return 0;
 248
 249 err_bad_alarm:
 250         free_irq(rtc->carry_irq, dev);
 251 err_bad_carry:
 252         free_irq(rtc->periodic_irq, dev);
 253
 254         return ret;
 255 }
 256
 257 static void sh_rtc_release(struct device *dev)
 258 {
 259         struct sh_rtc *rtc = dev_get_drvdata(dev);
 260
 261         sh_rtc_setpie(dev, 0);
 262         sh_rtc_setaie(dev, 0);
 263
 264         free_irq(rtc->periodic_irq, dev);
 265         free_irq(rtc->carry_irq, dev);
 266         free_irq(rtc->alarm_irq, dev);
 267 }
 268
 269 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 270 {
 271         struct sh_rtc *rtc = dev_get_drvdata(dev);
 272         unsigned int tmp;
 273
 274         tmp = readb(rtc->regbase + RCR1);
 275         seq_printf(seq, "carry_IRQ\t: %s\n",
 276                    (tmp & RCR1_CIE) ? "yes" : "no");
 277
 278         tmp = readb(rtc->regbase + RCR2);
 279         seq_printf(seq, "periodic_IRQ\t: %s\n",
 280                    (tmp & RCR2_PEF) ? "yes" : "no");
 281
 282         return 0;
 283 }
 284
 285 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 286 {
 287         unsigned int ret = -ENOIOCTLCMD;
 288
 289         switch (cmd) {
 290         case RTC_PIE_OFF:
 291         case RTC_PIE_ON:
 292                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 293                 ret = 0;
 294                 break;
 295         case RTC_AIE_OFF:
 296         case RTC_AIE_ON:
 297                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 298                 ret = 0;
 299                 break;
 300         }
 301
 302         return ret;
 303 }
 304
 305 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 306 {
 307         struct platform_device *pdev = to_platform_device(dev);
 308         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 309         unsigned int sec128, sec2, yr, yr100, cf_bit;
 310
 311         do {
 312                 unsigned int tmp;
 313
 314                 spin_lock_irq(&rtc->lock);
 315
 316                 tmp = readb(rtc->regbase + RCR1);
 317                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 318                 tmp |= RCR1_CIE;
 319                 writeb(tmp, rtc->regbase + RCR1);
 320
 321                 sec128 = readb(rtc->regbase + R64CNT);
 322
 323                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 324                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 325                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 326                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 327                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 328                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 329
 330                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 331                         yr  = readw(rtc->regbase + RYRCNT);
 332                         yr100 = BCD2BIN(yr >> 8);
 333                         yr &= 0xff;
 334                 } else {
 335                         yr  = readb(rtc->regbase + RYRCNT);
 336                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 337                 }
 338
 339                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 340
 341                 sec2 = readb(rtc->regbase + R64CNT);
 342                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 343
 344                 spin_unlock_irq(&rtc->lock);
 345         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 346
 347 #if RTC_BIT_INVERTED != 0
 348         if ((sec128 & RTC_BIT_INVERTED))
 349                 tm->tm_sec--;
 350 #endif
 351
 352         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 353                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 354                 __FUNCTION__,
 355                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 356                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 357
 358         if (rtc_valid_tm(tm) < 0) {
 359                 dev_err(dev, "invalid date\n");
 360                 rtc_time_to_tm(0, tm);
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 367 {
 368         struct platform_device *pdev = to_platform_device(dev);
 369         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 370         unsigned int tmp;
 371         int year;
 372
 373         spin_lock_irq(&rtc->lock);
 374
 375         /* Reset pre-scaler & stop RTC */
 376         tmp = readb(rtc->regbase + RCR2);
 377         tmp |= RCR2_RESET;
 378         tmp &= ~RCR2_START;
 379         writeb(tmp, rtc->regbase + RCR2);
 380
 381         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 382         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 383         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 384         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 385         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 386         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 387
 388         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 389                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 390                         BIN2BCD(tm->tm_year % 100);
 391                 writew(year, rtc->regbase + RYRCNT);
 392         } else {
 393                 year = tm->tm_year % 100;
 394                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 395         }
 396
 397         /* Start RTC */
 398         tmp = readb(rtc->regbase + RCR2);
 399         tmp &= ~RCR2_RESET;
 400         tmp |= RCR2_RTCEN | RCR2_START;
 401         writeb(tmp, rtc->regbase + RCR2);
 402
 403         spin_unlock_irq(&rtc->lock);
 404
 405         return 0;
 406 }
 407
 408 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 409 {
 410         unsigned int byte;
 411         int value = 0xff;       /* return 0xff for ignored values */
 412
 413         byte = readb(rtc->regbase + reg_off);
 414         if (byte & AR_ENB) {
 415                 byte &= ~AR_ENB;        /* strip the enable bit */
 416                 value = BCD2BIN(byte);
 417         }
 418
 419         return value;
 420 }
 421
 422 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 423 {
 424         struct platform_device *pdev = to_platform_device(dev);
 425         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 426         struct rtc_time* tm = &wkalrm->time;
 427
 428         spin_lock_irq(&rtc->lock);
 429
 430         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 431         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 432         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 433         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 434         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 435         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 436         if (tm->tm_mon > 0)
 437                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 438         tm->tm_year     = 0xffff;
 439
 440         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 441
 442         spin_unlock_irq(&rtc->lock);
 443
 444         return 0;
 445 }
 446
 447 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 448                                             int value, int reg_off)
 449 {
 450         /* < 0 for a value that is ignored */
 451         if (value < 0)
 452                 writeb(0, rtc->regbase + reg_off);
 453         else
 454                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 455 }
 456
 457 static int sh_rtc_check_alarm(struct rtc_time* tm)
 458 {
 459         /*
 460          * The original rtc says anything > 0xc0 is "don't care" or "match
 461          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 462          * The original rtc doesn't support years - some things use -1 and
 463          * some 0xffff. We use -1 to make out tests easier.
 464          */
 465         if (tm->tm_year == 0xffff)
 466                 tm->tm_year = -1;
 467         if (tm->tm_mon >= 0xff)
 468                 tm->tm_mon = -1;
 469         if (tm->tm_mday >= 0xff)
 470                 tm->tm_mday = -1;
 471         if (tm->tm_wday >= 0xff)
 472                 tm->tm_wday = -1;
 473         if (tm->tm_hour >= 0xff)
 474                 tm->tm_hour = -1;
 475         if (tm->tm_min >= 0xff)
 476                 tm->tm_min = -1;
 477         if (tm->tm_sec >= 0xff)
 478                 tm->tm_sec = -1;
 479
 480         if (tm->tm_year > 9999 ||
 481                 tm->tm_mon >= 12 ||
 482                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 483                 tm->tm_wday >= 7 ||
 484                 tm->tm_hour >= 24 ||
 485                 tm->tm_min >= 60 ||
 486                 tm->tm_sec >= 60)
 487                 return -EINVAL;
 488
 489         return 0;
 490 }
 491
 492 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 493 {
 494         struct platform_device *pdev = to_platform_device(dev);
 495         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 496         unsigned int rcr1;
 497         struct rtc_time *tm = &wkalrm->time;
 498         int mon, err;
 499
 500         err = sh_rtc_check_alarm(tm);
 501         if (unlikely(err < 0))
 502                 return err;
 503
 504         spin_lock_irq(&rtc->lock);
 505
 506         /* disable alarm interrupt and clear the alarm flag */
 507         rcr1 = readb(rtc->regbase + RCR1);
 508         rcr1 &= ~(RCR1_AF|RCR1_AIE);
 509         writeb(rcr1, rtc->regbase + RCR1);
 510
 511         rtc->rearm_aie = 0;
 512
 513         /* set alarm time */
 514         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 515         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 516         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 517         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 518         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 519         mon = tm->tm_mon;
 520         if (mon >= 0)
 521                 mon += 1;
 522         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 523
 524         if (wkalrm->enabled) {
 525                 rcr1 |= RCR1_AIE;
 526                 writeb(rcr1, rtc->regbase + RCR1);
 527         }
 528
 529         spin_unlock_irq(&rtc->lock);
 530
 531         return 0;
 532 }
 533
 534 static struct rtc_class_ops sh_rtc_ops = {
 535         .open           = sh_rtc_open,
 536         .release        = sh_rtc_release,
 537         .ioctl          = sh_rtc_ioctl,
 538         .read_time      = sh_rtc_read_time,
 539         .set_time       = sh_rtc_set_time,
 540         .read_alarm     = sh_rtc_read_alarm,
 541         .set_alarm      = sh_rtc_set_alarm,
 542         .proc           = sh_rtc_proc,
 543 };
 544
 545 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 546 {
 547         struct sh_rtc *rtc;
 548         struct resource *res;
 549         int ret = -ENOENT;
 550
 551         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 552         if (unlikely(!rtc))
 553                 return -ENOMEM;
 554
 555         spin_lock_init(&rtc->lock);
 556
 557         rtc->periodic_irq = platform_get_irq(pdev, 0);
 558         if (unlikely(rtc->periodic_irq < 0)) {
 559                 dev_err(&pdev->dev, "No IRQ for period\n");
 560                 goto err_badres;
 561         }
 562
 563         rtc->carry_irq = platform_get_irq(pdev, 1);
 564         if (unlikely(rtc->carry_irq < 0)) {
 565                 dev_err(&pdev->dev, "No IRQ for carry\n");
 566                 goto err_badres;
 567         }
 568
 569         rtc->alarm_irq = platform_get_irq(pdev, 2);
 570         if (unlikely(rtc->alarm_irq < 0)) {
 571                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 572                 goto err_badres;
 573         }
 574
 575         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 576         if (unlikely(res == NULL)) {
 577                 dev_err(&pdev->dev, "No IO resource\n");
 578                 goto err_badres;
 579         }
 580
 581         rtc->regsize = res->end - res->start + 1;
 582
 583         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 584         if (unlikely(!rtc->res)) {
 585                 ret = -EBUSY;
 586                 goto err_badres;
 587         }
 588
 589         rtc->regbase = (void __iomem *)rtc->res->start;
 590         if (unlikely(!rtc->regbase)) {
 591                 ret = -EINVAL;
 592                 goto err_badmap;
 593         }
 594
 595         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 596                                            &sh_rtc_ops, THIS_MODULE);
 597         if (IS_ERR(rtc->rtc_dev)) {
 598                 ret = PTR_ERR(rtc->rtc_dev);
 599                 goto err_badmap;
 600         }
 601
 602         rtc->capabilities = RTC_DEF_CAPABILITIES;
 603         if (pdev->dev.platform_data) {
 604                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 605
 606                 /*
 607                  * Some CPUs have special capabilities in addition to the
 608                  * default set. Add those in here.
 609                  */
 610                 rtc->capabilities |= pinfo->capabilities;
 611         }
 612
 613         platform_set_drvdata(pdev, rtc);
 614
 615         return 0;
 616
 617 err_badmap:
 618         release_resource(rtc->res);
 619 err_badres:
 620         kfree(rtc);
 621
 622         return ret;
 623 }
 624
 625 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 626 {
 627         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 628
 629         if (likely(rtc->rtc_dev))
 630                 rtc_device_unregister(rtc->rtc_dev);
 631
 632         sh_rtc_setpie(&pdev->dev, 0);
 633         sh_rtc_setaie(&pdev->dev, 0);
 634
 635         release_resource(rtc->res);
 636
 637         platform_set_drvdata(pdev, NULL);
 638
 639         kfree(rtc);
 640
 641         return 0;
 642 }
 643 static struct platform_driver sh_rtc_platform_driver = {
 644         .driver         = {
 645                 .name   = DRV_NAME,
 646                 .owner  = THIS_MODULE,
 647         },
 648         .probe          = sh_rtc_probe,
 649         .remove         = __devexit_p(sh_rtc_remove),
 650 };
 651
 652 static int __init sh_rtc_init(void)
 653 {
 654         return platform_driver_register(&sh_rtc_platform_driver);
 655 }
 656
 657 static void __exit sh_rtc_exit(void)
 658 {
 659         platform_driver_unregister(&sh_rtc_platform_driver);
 660 }
 661
 662 module_init(sh_rtc_init);
 663 module_exit(sh_rtc_exit);
 664
 665 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 666 MODULE_VERSION(DRV_VERSION);
 667 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
 668 MODULE_LICENSE("GPL");