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     "0.1.6"
  30
  31 #define RTC_REG(r)      ((r) * rtc_reg_size)
  32
  33 #define R64CNT          RTC_REG(0)
  34
  35 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  36 #define RMINCNT         RTC_REG(2)      /* RTC min */
  37 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  38 #define RWKCNT          RTC_REG(4)      /* RTC week */
  39 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  40 #define RMONCNT         RTC_REG(6)      /* RTC month */
  41 #define RYRCNT          RTC_REG(7)      /* RTC year */
  42 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  43 #define RMINAR          RTC_REG(9)      /* ALARM min */
  44 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  45 #define RWKAR           RTC_REG(11)     /* ALARM week */
  46 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  47 #define RMONAR          RTC_REG(13)     /* ALARM month */
  48 #define RCR1            RTC_REG(14)     /* Control */
  49 #define RCR2            RTC_REG(15)     /* Control */
  50
  51 /*
  52  * Note on RYRAR and RCR3: Up until this point most of the register
  53  * definitions are consistent across all of the available parts. However,
  54  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  55  * register used to control RYRCNT/RYRAR compare) varies considerably
  56  * across various parts, occasionally being mapped in to a completely
  57  * unrelated address space. For proper RYRAR support a separate resource
  58  * would have to be handed off, but as this is purely optional in
  59  * practice, we simply opt not to support it, thereby keeping the code
  60  * quite a bit more simplified.
  61  */
  62
  63 /* ALARM Bits - or with BCD encoded value */
  64 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  65
  66 /* RCR1 Bits */
  67 #define RCR1_CF         0x80    /* Carry Flag             */
  68 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  69 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  70 #define RCR1_AF         0x01    /* Alarm Flag             */
  71
  72 /* RCR2 Bits */
  73 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  74 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  75 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  76 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  77 #define RCR2_RESET      0x02    /* Reset bit               */
  78 #define RCR2_START      0x01    /* Start bit               */
  79
  80 struct sh_rtc {
  81         void __iomem *regbase;
  82         unsigned long regsize;
  83         struct resource *res;
  84         unsigned int alarm_irq, periodic_irq, carry_irq;
  85         struct rtc_device *rtc_dev;
  86         spinlock_t lock;
  87         int rearm_aie;
  88         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
  89 };
  90
  91 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
  92 {
  93         struct platform_device *pdev = to_platform_device(dev_id);
  94         struct sh_rtc *rtc = platform_get_drvdata(pdev);
  95         unsigned int tmp, events = 0;
  96
  97         spin_lock(&rtc->lock);
  98
  99         tmp = readb(rtc->regbase + RCR1);
 100         tmp &= ~RCR1_CF;
 101
 102         if (rtc->rearm_aie) {
 103                 if (tmp & RCR1_AF)
 104                         tmp &= ~RCR1_AF;        /* try to clear AF again */
 105                 else {
 106                         tmp |= RCR1_AIE;        /* AF has cleared, rearm IRQ */
 107                         rtc->rearm_aie = 0;
 108                 }
 109         }
 110
 111         writeb(tmp, rtc->regbase + RCR1);
 112
 113         rtc_update_irq(rtc->rtc_dev, 1, events);
 114
 115         spin_unlock(&rtc->lock);
 116
 117         return IRQ_HANDLED;
 118 }
 119
 120 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 121 {
 122         struct platform_device *pdev = to_platform_device(dev_id);
 123         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 124         unsigned int tmp, events = 0;
 125
 126         spin_lock(&rtc->lock);
 127
 128         tmp = readb(rtc->regbase + RCR1);
 129
 130         /*
 131          * If AF is set then the alarm has triggered. If we clear AF while
 132          * the alarm time still matches the RTC time then AF will
 133          * immediately be set again, and if AIE is enabled then the alarm
 134          * interrupt will immediately be retrigger. So we clear AIE here
 135          * and use rtc->rearm_aie so that the carry interrupt will keep
 136          * trying to clear AF and once it stays cleared it'll re-enable
 137          * AIE.
 138          */
 139         if (tmp & RCR1_AF) {
 140                 events |= RTC_AF | RTC_IRQF;
 141
 142                 tmp &= ~(RCR1_AF|RCR1_AIE);
 143
 144                 writeb(tmp, rtc->regbase + RCR1);
 145
 146                 rtc->rearm_aie = 1;
 147
 148                 rtc_update_irq(rtc->rtc_dev, 1, events);
 149         }
 150
 151         spin_unlock(&rtc->lock);
 152         return IRQ_HANDLED;
 153 }
 154
 155 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 156 {
 157         struct platform_device *pdev = to_platform_device(dev_id);
 158         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 159
 160         spin_lock(&rtc->lock);
 161
 162         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 163
 164         spin_unlock(&rtc->lock);
 165
 166         return IRQ_HANDLED;
 167 }
 168
 169 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 170 {
 171         struct sh_rtc *rtc = dev_get_drvdata(dev);
 172         unsigned int tmp;
 173
 174         spin_lock_irq(&rtc->lock);
 175
 176         tmp = readb(rtc->regbase + RCR2);
 177
 178         if (enable) {
 179                 tmp &= ~RCR2_PESMASK;
 180                 tmp |= RCR2_PEF | (2 << 4);
 181         } else
 182                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 183
 184         writeb(tmp, rtc->regbase + RCR2);
 185
 186         spin_unlock_irq(&rtc->lock);
 187 }
 188
 189 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 190 {
 191         struct sh_rtc *rtc = dev_get_drvdata(dev);
 192         unsigned int tmp;
 193
 194         spin_lock_irq(&rtc->lock);
 195
 196         tmp = readb(rtc->regbase + RCR1);
 197
 198         if (!enable) {
 199                 tmp &= ~RCR1_AIE;
 200                 rtc->rearm_aie = 0;
 201         } else if (rtc->rearm_aie == 0)
 202                 tmp |= RCR1_AIE;
 203
 204         writeb(tmp, rtc->regbase + RCR1);
 205
 206         spin_unlock_irq(&rtc->lock);
 207 }
 208
 209 static int sh_rtc_open(struct device *dev)
 210 {
 211         struct sh_rtc *rtc = dev_get_drvdata(dev);
 212         unsigned int tmp;
 213         int ret;
 214
 215         tmp = readb(rtc->regbase + RCR1);
 216         tmp &= ~RCR1_CF;
 217         tmp |= RCR1_CIE;
 218         writeb(tmp, rtc->regbase + RCR1);
 219
 220         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 221                           "sh-rtc period", dev);
 222         if (unlikely(ret)) {
 223                 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
 224                         ret, rtc->periodic_irq);
 225                 return ret;
 226         }
 227
 228         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 229                           "sh-rtc carry", dev);
 230         if (unlikely(ret)) {
 231                 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
 232                         ret, rtc->carry_irq);
 233                 free_irq(rtc->periodic_irq, dev);
 234                 goto err_bad_carry;
 235         }
 236
 237         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 238                           "sh-rtc alarm", dev);
 239         if (unlikely(ret)) {
 240                 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
 241                         ret, rtc->alarm_irq);
 242                 goto err_bad_alarm;
 243         }
 244
 245         return 0;
 246
 247 err_bad_alarm:
 248         free_irq(rtc->carry_irq, dev);
 249 err_bad_carry:
 250         free_irq(rtc->periodic_irq, dev);
 251
 252         return ret;
 253 }
 254
 255 static void sh_rtc_release(struct device *dev)
 256 {
 257         struct sh_rtc *rtc = dev_get_drvdata(dev);
 258
 259         sh_rtc_setpie(dev, 0);
 260         sh_rtc_setaie(dev, 0);
 261
 262         free_irq(rtc->periodic_irq, dev);
 263         free_irq(rtc->carry_irq, dev);
 264         free_irq(rtc->alarm_irq, dev);
 265 }
 266
 267 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 268 {
 269         struct sh_rtc *rtc = dev_get_drvdata(dev);
 270         unsigned int tmp;
 271
 272         tmp = readb(rtc->regbase + RCR1);
 273         seq_printf(seq, "carry_IRQ\t: %s\n",
 274                    (tmp & RCR1_CIE) ? "yes" : "no");
 275
 276         tmp = readb(rtc->regbase + RCR2);
 277         seq_printf(seq, "periodic_IRQ\t: %s\n",
 278                    (tmp & RCR2_PEF) ? "yes" : "no");
 279
 280         return 0;
 281 }
 282
 283 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 284 {
 285         unsigned int ret = -ENOIOCTLCMD;
 286
 287         switch (cmd) {
 288         case RTC_PIE_OFF:
 289         case RTC_PIE_ON:
 290                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 291                 ret = 0;
 292                 break;
 293         case RTC_AIE_OFF:
 294         case RTC_AIE_ON:
 295                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 296                 ret = 0;
 297                 break;
 298         }
 299
 300         return ret;
 301 }
 302
 303 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 304 {
 305         struct platform_device *pdev = to_platform_device(dev);
 306         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 307         unsigned int sec128, sec2, yr, yr100, cf_bit;
 308
 309         do {
 310                 unsigned int tmp;
 311
 312                 spin_lock_irq(&rtc->lock);
 313
 314                 tmp = readb(rtc->regbase + RCR1);
 315                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 316                 tmp |= RCR1_CIE;
 317                 writeb(tmp, rtc->regbase + RCR1);
 318
 319                 sec128 = readb(rtc->regbase + R64CNT);
 320
 321                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 322                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 323                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 324                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 325                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 326                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 327
 328                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 329                         yr  = readw(rtc->regbase + RYRCNT);
 330                         yr100 = BCD2BIN(yr >> 8);
 331                         yr &= 0xff;
 332                 } else {
 333                         yr  = readb(rtc->regbase + RYRCNT);
 334                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 335                 }
 336
 337                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 338
 339                 sec2 = readb(rtc->regbase + R64CNT);
 340                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 341
 342                 spin_unlock_irq(&rtc->lock);
 343         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 344
 345 #if RTC_BIT_INVERTED != 0
 346         if ((sec128 & RTC_BIT_INVERTED))
 347                 tm->tm_sec--;
 348 #endif
 349
 350         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 351                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 352                 __FUNCTION__,
 353                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 354                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 355
 356         if (rtc_valid_tm(tm) < 0) {
 357                 dev_err(dev, "invalid date\n");
 358                 rtc_time_to_tm(0, tm);
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 365 {
 366         struct platform_device *pdev = to_platform_device(dev);
 367         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 368         unsigned int tmp;
 369         int year;
 370
 371         spin_lock_irq(&rtc->lock);
 372
 373         /* Reset pre-scaler & stop RTC */
 374         tmp = readb(rtc->regbase + RCR2);
 375         tmp |= RCR2_RESET;
 376         tmp &= ~RCR2_START;
 377         writeb(tmp, rtc->regbase + RCR2);
 378
 379         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 380         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 381         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 382         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 383         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 384         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 385
 386         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 387                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 388                         BIN2BCD(tm->tm_year % 100);
 389                 writew(year, rtc->regbase + RYRCNT);
 390         } else {
 391                 year = tm->tm_year % 100;
 392                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 393         }
 394
 395         /* Start RTC */
 396         tmp = readb(rtc->regbase + RCR2);
 397         tmp &= ~RCR2_RESET;
 398         tmp |= RCR2_RTCEN | RCR2_START;
 399         writeb(tmp, rtc->regbase + RCR2);
 400
 401         spin_unlock_irq(&rtc->lock);
 402
 403         return 0;
 404 }
 405
 406 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 407 {
 408         unsigned int byte;
 409         int value = 0xff;       /* return 0xff for ignored values */
 410
 411         byte = readb(rtc->regbase + reg_off);
 412         if (byte & AR_ENB) {
 413                 byte &= ~AR_ENB;        /* strip the enable bit */
 414                 value = BCD2BIN(byte);
 415         }
 416
 417         return value;
 418 }
 419
 420 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 421 {
 422         struct platform_device *pdev = to_platform_device(dev);
 423         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 424         struct rtc_time* tm = &wkalrm->time;
 425
 426         spin_lock_irq(&rtc->lock);
 427
 428         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 429         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 430         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 431         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 432         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 433         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 434         if (tm->tm_mon > 0)
 435                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 436         tm->tm_year     = 0xffff;
 437
 438         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 439
 440         spin_unlock_irq(&rtc->lock);
 441
 442         return 0;
 443 }
 444
 445 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 446                                             int value, int reg_off)
 447 {
 448         /* < 0 for a value that is ignored */
 449         if (value < 0)
 450                 writeb(0, rtc->regbase + reg_off);
 451         else
 452                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 453 }
 454
 455 static int sh_rtc_check_alarm(struct rtc_time* tm)
 456 {
 457         /*
 458          * The original rtc says anything > 0xc0 is "don't care" or "match
 459          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 460          * The original rtc doesn't support years - some things use -1 and
 461          * some 0xffff. We use -1 to make out tests easier.
 462          */
 463         if (tm->tm_year == 0xffff)
 464                 tm->tm_year = -1;
 465         if (tm->tm_mon >= 0xff)
 466                 tm->tm_mon = -1;
 467         if (tm->tm_mday >= 0xff)
 468                 tm->tm_mday = -1;
 469         if (tm->tm_wday >= 0xff)
 470                 tm->tm_wday = -1;
 471         if (tm->tm_hour >= 0xff)
 472                 tm->tm_hour = -1;
 473         if (tm->tm_min >= 0xff)
 474                 tm->tm_min = -1;
 475         if (tm->tm_sec >= 0xff)
 476                 tm->tm_sec = -1;
 477
 478         if (tm->tm_year > 9999 ||
 479                 tm->tm_mon >= 12 ||
 480                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 481                 tm->tm_wday >= 7 ||
 482                 tm->tm_hour >= 24 ||
 483                 tm->tm_min >= 60 ||
 484                 tm->tm_sec >= 60)
 485                 return -EINVAL;
 486
 487         return 0;
 488 }
 489
 490 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 491 {
 492         struct platform_device *pdev = to_platform_device(dev);
 493         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 494         unsigned int rcr1;
 495         struct rtc_time *tm = &wkalrm->time;
 496         int mon, err;
 497
 498         err = sh_rtc_check_alarm(tm);
 499         if (unlikely(err < 0))
 500                 return err;
 501
 502         spin_lock_irq(&rtc->lock);
 503
 504         /* disable alarm interrupt and clear the alarm flag */
 505         rcr1 = readb(rtc->regbase + RCR1);
 506         rcr1 &= ~(RCR1_AF|RCR1_AIE);
 507         writeb(rcr1, rtc->regbase + RCR1);
 508
 509         rtc->rearm_aie = 0;
 510
 511         /* set alarm time */
 512         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 513         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 514         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 515         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 516         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 517         mon = tm->tm_mon;
 518         if (mon >= 0)
 519                 mon += 1;
 520         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 521
 522         if (wkalrm->enabled) {
 523                 rcr1 |= RCR1_AIE;
 524                 writeb(rcr1, rtc->regbase + RCR1);
 525         }
 526
 527         spin_unlock_irq(&rtc->lock);
 528
 529         return 0;
 530 }
 531
 532 static struct rtc_class_ops sh_rtc_ops = {
 533         .open           = sh_rtc_open,
 534         .release        = sh_rtc_release,
 535         .ioctl          = sh_rtc_ioctl,
 536         .read_time      = sh_rtc_read_time,
 537         .set_time       = sh_rtc_set_time,
 538         .read_alarm     = sh_rtc_read_alarm,
 539         .set_alarm      = sh_rtc_set_alarm,
 540         .proc           = sh_rtc_proc,
 541 };
 542
 543 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 544 {
 545         struct sh_rtc *rtc;
 546         struct resource *res;
 547         int ret = -ENOENT;
 548
 549         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 550         if (unlikely(!rtc))
 551                 return -ENOMEM;
 552
 553         spin_lock_init(&rtc->lock);
 554
 555         rtc->periodic_irq = platform_get_irq(pdev, 0);
 556         if (unlikely(rtc->periodic_irq < 0)) {
 557                 dev_err(&pdev->dev, "No IRQ for period\n");
 558                 goto err_badres;
 559         }
 560
 561         rtc->carry_irq = platform_get_irq(pdev, 1);
 562         if (unlikely(rtc->carry_irq < 0)) {
 563                 dev_err(&pdev->dev, "No IRQ for carry\n");
 564                 goto err_badres;
 565         }
 566
 567         rtc->alarm_irq = platform_get_irq(pdev, 2);
 568         if (unlikely(rtc->alarm_irq < 0)) {
 569                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 570                 goto err_badres;
 571         }
 572
 573         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 574         if (unlikely(res == NULL)) {
 575                 dev_err(&pdev->dev, "No IO resource\n");
 576                 goto err_badres;
 577         }
 578
 579         rtc->regsize = res->end - res->start + 1;
 580
 581         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 582         if (unlikely(!rtc->res)) {
 583                 ret = -EBUSY;
 584                 goto err_badres;
 585         }
 586
 587         rtc->regbase = (void __iomem *)rtc->res->start;
 588         if (unlikely(!rtc->regbase)) {
 589                 ret = -EINVAL;
 590                 goto err_badmap;
 591         }
 592
 593         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 594                                            &sh_rtc_ops, THIS_MODULE);
 595         if (IS_ERR(rtc->rtc_dev)) {
 596                 ret = PTR_ERR(rtc->rtc_dev);
 597                 goto err_badmap;
 598         }
 599
 600         rtc->capabilities = RTC_DEF_CAPABILITIES;
 601         if (pdev->dev.platform_data) {
 602                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 603
 604                 /*
 605                  * Some CPUs have special capabilities in addition to the
 606                  * default set. Add those in here.
 607                  */
 608                 rtc->capabilities |= pinfo->capabilities;
 609         }
 610
 611         platform_set_drvdata(pdev, rtc);
 612
 613         return 0;
 614
 615 err_badmap:
 616         release_resource(rtc->res);
 617 err_badres:
 618         kfree(rtc);
 619
 620         return ret;
 621 }
 622
 623 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 624 {
 625         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 626
 627         if (likely(rtc->rtc_dev))
 628                 rtc_device_unregister(rtc->rtc_dev);
 629
 630         sh_rtc_setpie(&pdev->dev, 0);
 631         sh_rtc_setaie(&pdev->dev, 0);
 632
 633         release_resource(rtc->res);
 634
 635         platform_set_drvdata(pdev, NULL);
 636
 637         kfree(rtc);
 638
 639         return 0;
 640 }
 641 static struct platform_driver sh_rtc_platform_driver = {
 642         .driver         = {
 643                 .name   = DRV_NAME,
 644                 .owner  = THIS_MODULE,
 645         },
 646         .probe          = sh_rtc_probe,
 647         .remove         = __devexit_p(sh_rtc_remove),
 648 };
 649
 650 static int __init sh_rtc_init(void)
 651 {
 652         return platform_driver_register(&sh_rtc_platform_driver);
 653 }
 654
 655 static void __exit sh_rtc_exit(void)
 656 {
 657         platform_driver_unregister(&sh_rtc_platform_driver);
 658 }
 659
 660 module_init(sh_rtc_init);
 661 module_exit(sh_rtc_exit);
 662
 663 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 664 MODULE_VERSION(DRV_VERSION);
 665 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
 666 MODULE_LICENSE("GPL");