SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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     "0.1.5"
  30
  31 #ifdef CONFIG_CPU_SH2A
  32 #define rtc_reg_size            sizeof(u16)
  33 #define RTC_BIT_INVERTED        0
  34 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
  35 #elif defined(CONFIG_CPU_SH3)
  36 #define rtc_reg_size            sizeof(u16)
  37 #define RTC_BIT_INVERTED        0       /* No bug on SH7708, SH7709A */
  38 #define RTC_DEF_CAPABILITIES    0UL
  39 #elif defined(CONFIG_CPU_SH4)
  40 #define rtc_reg_size            sizeof(u32)
  41 #define RTC_BIT_INVERTED        0x40    /* bug on SH7750, SH7750S */
  42 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
  43 #elif defined(CONFIG_CPU_SH5)
  44 #define rtc_reg_size            sizeof(u32)
  45 #define RTC_BIT_INVERTED        0       /* The SH-5 RTC is surprisingly sane! */
  46 #define RTC_DEF_CAPABILITIES    RTC_CAP_4_DIGIT_YEAR
  47 #endif
  48
  49 #define RTC_REG(r)      ((r) * rtc_reg_size)
  50
  51 #define R64CNT          RTC_REG(0)
  52
  53 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  54 #define RMINCNT         RTC_REG(2)      /* RTC min */
  55 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  56 #define RWKCNT          RTC_REG(4)      /* RTC week */
  57 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  58 #define RMONCNT         RTC_REG(6)      /* RTC month */
  59 #define RYRCNT          RTC_REG(7)      /* RTC year */
  60 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  61 #define RMINAR          RTC_REG(9)      /* ALARM min */
  62 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  63 #define RWKAR           RTC_REG(11)     /* ALARM week */
  64 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  65 #define RMONAR          RTC_REG(13)     /* ALARM month */
  66 #define RCR1            RTC_REG(14)     /* Control */
  67 #define RCR2            RTC_REG(15)     /* Control */
  68
  69 /*
  70  * Note on RYRAR and RCR3: Up until this point most of the register
  71  * definitions are consistent across all of the available parts. However,
  72  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  73  * register used to control RYRCNT/RYRAR compare) varies considerably
  74  * across various parts, occasionally being mapped in to a completely
  75  * unrelated address space. For proper RYRAR support a separate resource
  76  * would have to be handed off, but as this is purely optional in
  77  * practice, we simply opt not to support it, thereby keeping the code
  78  * quite a bit more simplified.
  79  */
  80
  81 /* ALARM Bits - or with BCD encoded value */
  82 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  83
  84 /* RCR1 Bits */
  85 #define RCR1_CF         0x80    /* Carry Flag             */
  86 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  87 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  88 #define RCR1_AF         0x01    /* Alarm Flag             */
  89
  90 /* RCR2 Bits */
  91 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  92 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  93 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  94 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  95 #define RCR2_RESET      0x02    /* Reset bit               */
  96 #define RCR2_START      0x01    /* Start bit               */
  97
  98 struct sh_rtc {
  99         void __iomem *regbase;
 100         unsigned long regsize;
 101         struct resource *res;
 102         unsigned int alarm_irq, periodic_irq, carry_irq;
 103         struct rtc_device *rtc_dev;
 104         spinlock_t lock;
 105         int rearm_aie;
 106         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
 107 };
 108
 109 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 110 {
 111         struct platform_device *pdev = to_platform_device(dev_id);
 112         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 113         unsigned int tmp, events = 0;
 114
 115         spin_lock(&rtc->lock);
 116
 117         tmp = readb(rtc->regbase + RCR1);
 118         tmp &= ~RCR1_CF;
 119
 120         if (rtc->rearm_aie) {
 121                 if (tmp & RCR1_AF)
 122                         tmp &= ~RCR1_AF;        /* try to clear AF again */
 123                 else {
 124                         tmp |= RCR1_AIE;        /* AF has cleared, rearm IRQ */
 125                         rtc->rearm_aie = 0;
 126                 }
 127         }
 128
 129         writeb(tmp, rtc->regbase + RCR1);
 130
 131         rtc_update_irq(rtc->rtc_dev, 1, events);
 132
 133         spin_unlock(&rtc->lock);
 134
 135         return IRQ_HANDLED;
 136 }
 137
 138 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 139 {
 140         struct platform_device *pdev = to_platform_device(dev_id);
 141         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 142         unsigned int tmp, events = 0;
 143
 144         spin_lock(&rtc->lock);
 145
 146         tmp = readb(rtc->regbase + RCR1);
 147
 148         /*
 149          * If AF is set then the alarm has triggered. If we clear AF while
 150          * the alarm time still matches the RTC time then AF will
 151          * immediately be set again, and if AIE is enabled then the alarm
 152          * interrupt will immediately be retrigger. So we clear AIE here
 153          * and use rtc->rearm_aie so that the carry interrupt will keep
 154          * trying to clear AF and once it stays cleared it'll re-enable
 155          * AIE.
 156          */
 157         if (tmp & RCR1_AF) {
 158                 events |= RTC_AF | RTC_IRQF;
 159
 160                 tmp &= ~(RCR1_AF|RCR1_AIE);
 161
 162                 writeb(tmp, rtc->regbase + RCR1);
 163
 164                 rtc->rearm_aie = 1;
 165
 166                 rtc_update_irq(rtc->rtc_dev, 1, events);
 167         }
 168
 169         spin_unlock(&rtc->lock);
 170         return IRQ_HANDLED;
 171 }
 172
 173 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 174 {
 175         struct platform_device *pdev = to_platform_device(dev_id);
 176         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 177
 178         spin_lock(&rtc->lock);
 179
 180         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 181
 182         spin_unlock(&rtc->lock);
 183
 184         return IRQ_HANDLED;
 185 }
 186
 187 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 188 {
 189         struct sh_rtc *rtc = dev_get_drvdata(dev);
 190         unsigned int tmp;
 191
 192         spin_lock_irq(&rtc->lock);
 193
 194         tmp = readb(rtc->regbase + RCR2);
 195
 196         if (enable) {
 197                 tmp &= ~RCR2_PESMASK;
 198                 tmp |= RCR2_PEF | (2 << 4);
 199         } else
 200                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 201
 202         writeb(tmp, rtc->regbase + RCR2);
 203
 204         spin_unlock_irq(&rtc->lock);
 205 }
 206
 207 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 208 {
 209         struct sh_rtc *rtc = dev_get_drvdata(dev);
 210         unsigned int tmp;
 211
 212         spin_lock_irq(&rtc->lock);
 213
 214         tmp = readb(rtc->regbase + RCR1);
 215
 216         if (!enable) {
 217                 tmp &= ~RCR1_AIE;
 218                 rtc->rearm_aie = 0;
 219         } else if (rtc->rearm_aie == 0)
 220                 tmp |= RCR1_AIE;
 221
 222         writeb(tmp, rtc->regbase + RCR1);
 223
 224         spin_unlock_irq(&rtc->lock);
 225 }
 226
 227 static int sh_rtc_open(struct device *dev)
 228 {
 229         struct sh_rtc *rtc = dev_get_drvdata(dev);
 230         unsigned int tmp;
 231         int ret;
 232
 233         tmp = readb(rtc->regbase + RCR1);
 234         tmp &= ~RCR1_CF;
 235         tmp |= RCR1_CIE;
 236         writeb(tmp, rtc->regbase + RCR1);
 237
 238         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 239                           "sh-rtc period", dev);
 240         if (unlikely(ret)) {
 241                 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
 242                         ret, rtc->periodic_irq);
 243                 return ret;
 244         }
 245
 246         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 247                           "sh-rtc carry", dev);
 248         if (unlikely(ret)) {
 249                 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
 250                         ret, rtc->carry_irq);
 251                 free_irq(rtc->periodic_irq, dev);
 252                 goto err_bad_carry;
 253         }
 254
 255         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 256                           "sh-rtc alarm", dev);
 257         if (unlikely(ret)) {
 258                 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
 259                         ret, rtc->alarm_irq);
 260                 goto err_bad_alarm;
 261         }
 262
 263         return 0;
 264
 265 err_bad_alarm:
 266         free_irq(rtc->carry_irq, dev);
 267 err_bad_carry:
 268         free_irq(rtc->periodic_irq, dev);
 269
 270         return ret;
 271 }
 272
 273 static void sh_rtc_release(struct device *dev)
 274 {
 275         struct sh_rtc *rtc = dev_get_drvdata(dev);
 276
 277         sh_rtc_setpie(dev, 0);
 278         sh_rtc_setaie(dev, 0);
 279
 280         free_irq(rtc->periodic_irq, dev);
 281         free_irq(rtc->carry_irq, dev);
 282         free_irq(rtc->alarm_irq, dev);
 283 }
 284
 285 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 286 {
 287         struct sh_rtc *rtc = dev_get_drvdata(dev);
 288         unsigned int tmp;
 289
 290         tmp = readb(rtc->regbase + RCR1);
 291         seq_printf(seq, "carry_IRQ\t: %s\n",
 292                    (tmp & RCR1_CIE) ? "yes" : "no");
 293
 294         tmp = readb(rtc->regbase + RCR2);
 295         seq_printf(seq, "periodic_IRQ\t: %s\n",
 296                    (tmp & RCR2_PEF) ? "yes" : "no");
 297
 298         return 0;
 299 }
 300
 301 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 302 {
 303         unsigned int ret = -ENOIOCTLCMD;
 304
 305         switch (cmd) {
 306         case RTC_PIE_OFF:
 307         case RTC_PIE_ON:
 308                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 309                 ret = 0;
 310                 break;
 311         case RTC_AIE_OFF:
 312         case RTC_AIE_ON:
 313                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 314                 ret = 0;
 315                 break;
 316         }
 317
 318         return ret;
 319 }
 320
 321 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 322 {
 323         struct platform_device *pdev = to_platform_device(dev);
 324         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 325         unsigned int sec128, sec2, yr, yr100, cf_bit;
 326
 327         do {
 328                 unsigned int tmp;
 329
 330                 spin_lock_irq(&rtc->lock);
 331
 332                 tmp = readb(rtc->regbase + RCR1);
 333                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 334                 tmp |= RCR1_CIE;
 335                 writeb(tmp, rtc->regbase + RCR1);
 336
 337                 sec128 = readb(rtc->regbase + R64CNT);
 338
 339                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 340                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 341                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 342                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 343                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 344                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 345
 346                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 347                         yr  = readw(rtc->regbase + RYRCNT);
 348                         yr100 = BCD2BIN(yr >> 8);
 349                         yr &= 0xff;
 350                 } else {
 351                         yr  = readb(rtc->regbase + RYRCNT);
 352                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 353                 }
 354
 355                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 356
 357                 sec2 = readb(rtc->regbase + R64CNT);
 358                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 359
 360                 spin_unlock_irq(&rtc->lock);
 361         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 362
 363 #if RTC_BIT_INVERTED != 0
 364         if ((sec128 & RTC_BIT_INVERTED))
 365                 tm->tm_sec--;
 366 #endif
 367
 368         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 369                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 370                 __FUNCTION__,
 371                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 372                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 373
 374         if (rtc_valid_tm(tm) < 0) {
 375                 dev_err(dev, "invalid date\n");
 376                 rtc_time_to_tm(0, tm);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 383 {
 384         struct platform_device *pdev = to_platform_device(dev);
 385         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 386         unsigned int tmp;
 387         int year;
 388
 389         spin_lock_irq(&rtc->lock);
 390
 391         /* Reset pre-scaler & stop RTC */
 392         tmp = readb(rtc->regbase + RCR2);
 393         tmp |= RCR2_RESET;
 394         tmp &= ~RCR2_START;
 395         writeb(tmp, rtc->regbase + RCR2);
 396
 397         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 398         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 399         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 400         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 401         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 402         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 403
 404         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 405                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 406                         BIN2BCD(tm->tm_year % 100);
 407                 writew(year, rtc->regbase + RYRCNT);
 408         } else {
 409                 year = tm->tm_year % 100;
 410                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 411         }
 412
 413         /* Start RTC */
 414         tmp = readb(rtc->regbase + RCR2);
 415         tmp &= ~RCR2_RESET;
 416         tmp |= RCR2_RTCEN | RCR2_START;
 417         writeb(tmp, rtc->regbase + RCR2);
 418
 419         spin_unlock_irq(&rtc->lock);
 420
 421         return 0;
 422 }
 423
 424 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 425 {
 426         unsigned int byte;
 427         int value = 0xff;       /* return 0xff for ignored values */
 428
 429         byte = readb(rtc->regbase + reg_off);
 430         if (byte & AR_ENB) {
 431                 byte &= ~AR_ENB;        /* strip the enable bit */
 432                 value = BCD2BIN(byte);
 433         }
 434
 435         return value;
 436 }
 437
 438 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 439 {
 440         struct platform_device *pdev = to_platform_device(dev);
 441         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 442         struct rtc_time* tm = &wkalrm->time;
 443
 444         spin_lock_irq(&rtc->lock);
 445
 446         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 447         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 448         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 449         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 450         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 451         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 452         if (tm->tm_mon > 0)
 453                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 454         tm->tm_year     = 0xffff;
 455
 456         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 457
 458         spin_unlock_irq(&rtc->lock);
 459
 460         return 0;
 461 }
 462
 463 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 464                                             int value, int reg_off)
 465 {
 466         /* < 0 for a value that is ignored */
 467         if (value < 0)
 468                 writeb(0, rtc->regbase + reg_off);
 469         else
 470                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 471 }
 472
 473 static int sh_rtc_check_alarm(struct rtc_time* tm)
 474 {
 475         /*
 476          * The original rtc says anything > 0xc0 is "don't care" or "match
 477          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 478          * The original rtc doesn't support years - some things use -1 and
 479          * some 0xffff. We use -1 to make out tests easier.
 480          */
 481         if (tm->tm_year == 0xffff)
 482                 tm->tm_year = -1;
 483         if (tm->tm_mon >= 0xff)
 484                 tm->tm_mon = -1;
 485         if (tm->tm_mday >= 0xff)
 486                 tm->tm_mday = -1;
 487         if (tm->tm_wday >= 0xff)
 488                 tm->tm_wday = -1;
 489         if (tm->tm_hour >= 0xff)
 490                 tm->tm_hour = -1;
 491         if (tm->tm_min >= 0xff)
 492                 tm->tm_min = -1;
 493         if (tm->tm_sec >= 0xff)
 494                 tm->tm_sec = -1;
 495
 496         if (tm->tm_year > 9999 ||
 497                 tm->tm_mon >= 12 ||
 498                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 499                 tm->tm_wday >= 7 ||
 500                 tm->tm_hour >= 24 ||
 501                 tm->tm_min >= 60 ||
 502                 tm->tm_sec >= 60)
 503                 return -EINVAL;
 504
 505         return 0;
 506 }
 507
 508 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 509 {
 510         struct platform_device *pdev = to_platform_device(dev);
 511         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 512         unsigned int rcr1;
 513         struct rtc_time *tm = &wkalrm->time;
 514         int mon, err;
 515
 516         err = sh_rtc_check_alarm(tm);
 517         if (unlikely(err < 0))
 518                 return err;
 519
 520         spin_lock_irq(&rtc->lock);
 521
 522         /* disable alarm interrupt and clear the alarm flag */
 523         rcr1 = readb(rtc->regbase + RCR1);
 524         rcr1 &= ~(RCR1_AF|RCR1_AIE);
 525         writeb(rcr1, rtc->regbase + RCR1);
 526
 527         rtc->rearm_aie = 0;
 528
 529         /* set alarm time */
 530         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 531         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 532         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 533         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 534         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 535         mon = tm->tm_mon;
 536         if (mon >= 0)
 537                 mon += 1;
 538         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 539
 540         if (wkalrm->enabled) {
 541                 rcr1 |= RCR1_AIE;
 542                 writeb(rcr1, rtc->regbase + RCR1);
 543         }
 544
 545         spin_unlock_irq(&rtc->lock);
 546
 547         return 0;
 548 }
 549
 550 static struct rtc_class_ops sh_rtc_ops = {
 551         .open           = sh_rtc_open,
 552         .release        = sh_rtc_release,
 553         .ioctl          = sh_rtc_ioctl,
 554         .read_time      = sh_rtc_read_time,
 555         .set_time       = sh_rtc_set_time,
 556         .read_alarm     = sh_rtc_read_alarm,
 557         .set_alarm      = sh_rtc_set_alarm,
 558         .proc           = sh_rtc_proc,
 559 };
 560
 561 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 562 {
 563         struct sh_rtc *rtc;
 564         struct resource *res;
 565         int ret = -ENOENT;
 566
 567         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 568         if (unlikely(!rtc))
 569                 return -ENOMEM;
 570
 571         spin_lock_init(&rtc->lock);
 572
 573         rtc->periodic_irq = platform_get_irq(pdev, 0);
 574         if (unlikely(rtc->periodic_irq < 0)) {
 575                 dev_err(&pdev->dev, "No IRQ for period\n");
 576                 goto err_badres;
 577         }
 578
 579         rtc->carry_irq = platform_get_irq(pdev, 1);
 580         if (unlikely(rtc->carry_irq < 0)) {
 581                 dev_err(&pdev->dev, "No IRQ for carry\n");
 582                 goto err_badres;
 583         }
 584
 585         rtc->alarm_irq = platform_get_irq(pdev, 2);
 586         if (unlikely(rtc->alarm_irq < 0)) {
 587                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 588                 goto err_badres;
 589         }
 590
 591         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 592         if (unlikely(res == NULL)) {
 593                 dev_err(&pdev->dev, "No IO resource\n");
 594                 goto err_badres;
 595         }
 596
 597         rtc->regsize = res->end - res->start + 1;
 598
 599         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 600         if (unlikely(!rtc->res)) {
 601                 ret = -EBUSY;
 602                 goto err_badres;
 603         }
 604
 605         rtc->regbase = (void __iomem *)rtc->res->start;
 606         if (unlikely(!rtc->regbase)) {
 607                 ret = -EINVAL;
 608                 goto err_badmap;
 609         }
 610
 611         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 612                                            &sh_rtc_ops, THIS_MODULE);
 613         if (IS_ERR(rtc->rtc_dev)) {
 614                 ret = PTR_ERR(rtc->rtc_dev);
 615                 goto err_badmap;
 616         }
 617
 618         rtc->capabilities = RTC_DEF_CAPABILITIES;
 619         if (pdev->dev.platform_data) {
 620                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 621
 622                 /*
 623                  * Some CPUs have special capabilities in addition to the
 624                  * default set. Add those in here.
 625                  */
 626                 rtc->capabilities |= pinfo->capabilities;
 627         }
 628
 629         platform_set_drvdata(pdev, rtc);
 630
 631         return 0;
 632
 633 err_badmap:
 634         release_resource(rtc->res);
 635 err_badres:
 636         kfree(rtc);
 637
 638         return ret;
 639 }
 640
 641 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 642 {
 643         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 644
 645         if (likely(rtc->rtc_dev))
 646                 rtc_device_unregister(rtc->rtc_dev);
 647
 648         sh_rtc_setpie(&pdev->dev, 0);
 649         sh_rtc_setaie(&pdev->dev, 0);
 650
 651         release_resource(rtc->res);
 652
 653         platform_set_drvdata(pdev, NULL);
 654
 655         kfree(rtc);
 656
 657         return 0;
 658 }
 659 static struct platform_driver sh_rtc_platform_driver = {
 660         .driver         = {
 661                 .name   = DRV_NAME,
 662                 .owner  = THIS_MODULE,
 663         },
 664         .probe          = sh_rtc_probe,
 665         .remove         = __devexit_p(sh_rtc_remove),
 666 };
 667
 668 static int __init sh_rtc_init(void)
 669 {
 670         return platform_driver_register(&sh_rtc_platform_driver);
 671 }
 672
 673 static void __exit sh_rtc_exit(void)
 674 {
 675         platform_driver_unregister(&sh_rtc_platform_driver);
 676 }
 677
 678 module_init(sh_rtc_init);
 679 module_exit(sh_rtc_exit);
 680
 681 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 682 MODULE_VERSION(DRV_VERSION);
 683 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
 684 MODULE_LICENSE("GPL");