drivers/rtc/rtc-sh.c

   1 /*
   2  * SuperH On-Chip RTC Support
   3  *
   4  * Copyright (C) 2006, 2007, 2008  Paul Mundt
   5  * Copyright (C) 2006  Jamie Lenehan
   6  * Copyright (C) 2008  Angelo Castello
   7  *
   8  * Based on the old arch/sh/kernel/cpu/rtc.c by:
   9  *
  10  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
  11  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
  12  *
  13  * This file is subject to the terms and conditions of the GNU General Public
  14  * License.  See the file "COPYING" in the main directory of this archive
  15  * for more details.
  16  */
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/bcd.h>
  20 #include <linux/rtc.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/io.h>
  27 #include <asm/rtc.h>
  28
  29 #define DRV_NAME        "sh-rtc"
  30 #define DRV_VERSION     "0.2.0"
  31
  32 #define RTC_REG(r)      ((r) * rtc_reg_size)
  33
  34 #define R64CNT          RTC_REG(0)
  35
  36 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  37 #define RMINCNT         RTC_REG(2)      /* RTC min */
  38 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  39 #define RWKCNT          RTC_REG(4)      /* RTC week */
  40 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  41 #define RMONCNT         RTC_REG(6)      /* RTC month */
  42 #define RYRCNT          RTC_REG(7)      /* RTC year */
  43 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  44 #define RMINAR          RTC_REG(9)      /* ALARM min */
  45 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  46 #define RWKAR           RTC_REG(11)     /* ALARM week */
  47 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  48 #define RMONAR          RTC_REG(13)     /* ALARM month */
  49 #define RCR1            RTC_REG(14)     /* Control */
  50 #define RCR2            RTC_REG(15)     /* Control */
  51
  52 /*
  53  * Note on RYRAR and RCR3: Up until this point most of the register
  54  * definitions are consistent across all of the available parts. However,
  55  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  56  * register used to control RYRCNT/RYRAR compare) varies considerably
  57  * across various parts, occasionally being mapped in to a completely
  58  * unrelated address space. For proper RYRAR support a separate resource
  59  * would have to be handed off, but as this is purely optional in
  60  * practice, we simply opt not to support it, thereby keeping the code
  61  * quite a bit more simplified.
  62  */
  63
  64 /* ALARM Bits - or with BCD encoded value */
  65 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  66
  67 /* Period Bits */
  68 #define PF_HP           0x100   /* Enable Half Period to support 8,32,128Hz */
  69 #define PF_COUNT        0x200   /* Half periodic counter */
  70 #define PF_OXS          0x400   /* Periodic One x Second */
  71 #define PF_KOU          0x800   /* Kernel or User periodic request 1=kernel */
  72 #define PF_MASK         0xf00
  73
  74 /* RCR1 Bits */
  75 #define RCR1_CF         0x80    /* Carry Flag             */
  76 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  77 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  78 #define RCR1_AF         0x01    /* Alarm Flag             */
  79
  80 /* RCR2 Bits */
  81 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  82 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  83 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  84 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  85 #define RCR2_RESET      0x02    /* Reset bit               */
  86 #define RCR2_START      0x01    /* Start bit               */
  87
  88 struct sh_rtc {
  89         void __iomem *regbase;
  90         unsigned long regsize;
  91         struct resource *res;
  92         unsigned int alarm_irq, periodic_irq, carry_irq;
  93         struct rtc_device *rtc_dev;
  94         spinlock_t lock;
  95         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
  96         unsigned short periodic_freq;
  97 };
  98
  99 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 100 {
 101         struct sh_rtc *rtc = dev_id;
 102         unsigned int tmp;
 103
 104         spin_lock(&rtc->lock);
 105
 106         tmp = readb(rtc->regbase + RCR1);
 107         tmp &= ~RCR1_CF;
 108         writeb(tmp, rtc->regbase + RCR1);
 109
 110         /* Users have requested One x Second IRQ */
 111         if (rtc->periodic_freq & PF_OXS)
 112                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 113
 114         spin_unlock(&rtc->lock);
 115
 116         return IRQ_HANDLED;
 117 }
 118
 119 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 120 {
 121         struct sh_rtc *rtc = dev_id;
 122         unsigned int tmp;
 123
 124         spin_lock(&rtc->lock);
 125
 126         tmp = readb(rtc->regbase + RCR1);
 127         tmp &= ~(RCR1_AF | RCR1_AIE);
 128                 writeb(tmp, rtc->regbase + RCR1);
 129
 130         rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 131
 132         spin_unlock(&rtc->lock);
 133
 134         return IRQ_HANDLED;
 135 }
 136
 137 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 138 {
 139         struct sh_rtc *rtc = dev_id;
 140         struct rtc_device *rtc_dev = rtc->rtc_dev;
 141         unsigned int tmp;
 142
 143         spin_lock(&rtc->lock);
 144
 145         tmp = readb(rtc->regbase + RCR2);
 146         tmp &= ~RCR2_PEF;
 147         writeb(tmp, rtc->regbase + RCR2);
 148
 149         /* Half period enabled than one skipped and the next notified */
 150         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
 151                 rtc->periodic_freq &= ~PF_COUNT;
 152         else {
 153                 if (rtc->periodic_freq & PF_HP)
 154                         rtc->periodic_freq |= PF_COUNT;
 155                 if (rtc->periodic_freq & PF_KOU) {
 156                         spin_lock(&rtc_dev->irq_task_lock);
 157                         if (rtc_dev->irq_task)
 158                                 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
 159                         spin_unlock(&rtc_dev->irq_task_lock);
 160                 } else
 161                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 162         }
 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_PEF;       /* Clear PES bit */
 180                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 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 int sh_rtc_setfreq(struct device *dev, unsigned int freq)
 190 {
 191         struct sh_rtc *rtc = dev_get_drvdata(dev);
 192         int tmp, ret = 0;
 193
 194         spin_lock_irq(&rtc->lock);
 195         tmp = rtc->periodic_freq & PF_MASK;
 196
 197         switch (freq) {
 198         case 0:
 199                 rtc->periodic_freq = 0x00;
 200                 break;
 201         case 1:
 202                 rtc->periodic_freq = 0x60;
 203                 break;
 204         case 2:
 205                 rtc->periodic_freq = 0x50;
 206                 break;
 207         case 4:
 208                 rtc->periodic_freq = 0x40;
 209                 break;
 210         case 8:
 211                 rtc->periodic_freq = 0x30 | PF_HP;
 212                 break;
 213         case 16:
 214                 rtc->periodic_freq = 0x30;
 215                 break;
 216         case 32:
 217                 rtc->periodic_freq = 0x20 | PF_HP;
 218                 break;
 219         case 64:
 220                 rtc->periodic_freq = 0x20;
 221                 break;
 222         case 128:
 223                 rtc->periodic_freq = 0x10 | PF_HP;
 224                 break;
 225         case 256:
 226                 rtc->periodic_freq = 0x10;
 227                 break;
 228         default:
 229                 ret = -ENOTSUPP;
 230         }
 231
 232         if (ret == 0) {
 233                 rtc->periodic_freq |= tmp;
 234                 rtc->rtc_dev->irq_freq = freq;
 235         }
 236
 237         spin_unlock_irq(&rtc->lock);
 238         return ret;
 239 }
 240
 241 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 242 {
 243         struct sh_rtc *rtc = dev_get_drvdata(dev);
 244         unsigned int tmp;
 245
 246         spin_lock_irq(&rtc->lock);
 247
 248         tmp = readb(rtc->regbase + RCR1);
 249
 250         if (!enable)
 251                 tmp &= ~RCR1_AIE;
 252         else
 253                 tmp |= RCR1_AIE;
 254
 255         writeb(tmp, rtc->regbase + RCR1);
 256
 257         spin_unlock_irq(&rtc->lock);
 258 }
 259
 260 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 261 {
 262         struct sh_rtc *rtc = dev_get_drvdata(dev);
 263         unsigned int tmp;
 264
 265         tmp = readb(rtc->regbase + RCR1);
 266         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 267
 268         tmp = readb(rtc->regbase + RCR2);
 269         seq_printf(seq, "periodic_IRQ\t: %s\n",
 270                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 271
 272         return 0;
 273 }
 274
 275 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 276 {
 277         struct sh_rtc *rtc = dev_get_drvdata(dev);
 278         unsigned int ret = 0;
 279
 280         switch (cmd) {
 281         case RTC_PIE_OFF:
 282         case RTC_PIE_ON:
 283                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 284                 break;
 285         case RTC_AIE_OFF:
 286         case RTC_AIE_ON:
 287                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 288                 break;
 289         case RTC_UIE_OFF:
 290                 rtc->periodic_freq &= ~PF_OXS;
 291                 break;
 292         case RTC_UIE_ON:
 293                 rtc->periodic_freq |= PF_OXS;
 294                 break;
 295         case RTC_IRQP_READ:
 296                 ret = put_user(rtc->rtc_dev->irq_freq,
 297                                (unsigned long __user *)arg);
 298                 break;
 299         case RTC_IRQP_SET:
 300                 ret = sh_rtc_setfreq(dev, arg);
 301                 break;
 302         default:
 303                 ret = -ENOIOCTLCMD;
 304         }
 305
 306         return ret;
 307 }
 308
 309 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 310 {
 311         struct platform_device *pdev = to_platform_device(dev);
 312         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 313         unsigned int sec128, sec2, yr, yr100, cf_bit;
 314
 315         do {
 316                 unsigned int tmp;
 317
 318                 spin_lock_irq(&rtc->lock);
 319
 320                 tmp = readb(rtc->regbase + RCR1);
 321                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 322                 tmp |= RCR1_CIE;
 323                 writeb(tmp, rtc->regbase + RCR1);
 324
 325                 sec128 = readb(rtc->regbase + R64CNT);
 326
 327                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 328                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 329                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 330                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 331                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 332                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 333
 334                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 335                         yr  = readw(rtc->regbase + RYRCNT);
 336                         yr100 = BCD2BIN(yr >> 8);
 337                         yr &= 0xff;
 338                 } else {
 339                         yr  = readb(rtc->regbase + RYRCNT);
 340                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 341                 }
 342
 343                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 344
 345                 sec2 = readb(rtc->regbase + R64CNT);
 346                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 347
 348                 spin_unlock_irq(&rtc->lock);
 349         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 350
 351 #if RTC_BIT_INVERTED != 0
 352         if ((sec128 & RTC_BIT_INVERTED))
 353                 tm->tm_sec--;
 354 #endif
 355
 356         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 357                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 358                 __func__,
 359                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 360                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 361
 362         if (rtc_valid_tm(tm) < 0) {
 363                 dev_err(dev, "invalid date\n");
 364                 rtc_time_to_tm(0, tm);
 365         }
 366
 367         return 0;
 368 }
 369
 370 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 371 {
 372         struct platform_device *pdev = to_platform_device(dev);
 373         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 374         unsigned int tmp;
 375         int year;
 376
 377         spin_lock_irq(&rtc->lock);
 378
 379         /* Reset pre-scaler & stop RTC */
 380         tmp = readb(rtc->regbase + RCR2);
 381         tmp |= RCR2_RESET;
 382         tmp &= ~RCR2_START;
 383         writeb(tmp, rtc->regbase + RCR2);
 384
 385         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 386         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 387         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 388         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 389         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 390         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 391
 392         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 393                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 394                         BIN2BCD(tm->tm_year % 100);
 395                 writew(year, rtc->regbase + RYRCNT);
 396         } else {
 397                 year = tm->tm_year % 100;
 398                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 399         }
 400
 401         /* Start RTC */
 402         tmp = readb(rtc->regbase + RCR2);
 403         tmp &= ~RCR2_RESET;
 404         tmp |= RCR2_RTCEN | RCR2_START;
 405         writeb(tmp, rtc->regbase + RCR2);
 406
 407         spin_unlock_irq(&rtc->lock);
 408
 409         return 0;
 410 }
 411
 412 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 413 {
 414         unsigned int byte;
 415         int value = 0xff;       /* return 0xff for ignored values */
 416
 417         byte = readb(rtc->regbase + reg_off);
 418         if (byte & AR_ENB) {
 419                 byte &= ~AR_ENB;        /* strip the enable bit */
 420                 value = BCD2BIN(byte);
 421         }
 422
 423         return value;
 424 }
 425
 426 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 427 {
 428         struct platform_device *pdev = to_platform_device(dev);
 429         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 430         struct rtc_time *tm = &wkalrm->time;
 431
 432         spin_lock_irq(&rtc->lock);
 433
 434         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 435         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 436         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 437         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 438         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 439         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 440         if (tm->tm_mon > 0)
 441                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 442         tm->tm_year     = 0xffff;
 443
 444         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 445
 446         spin_unlock_irq(&rtc->lock);
 447
 448         return 0;
 449 }
 450
 451 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 452                                             int value, int reg_off)
 453 {
 454         /* < 0 for a value that is ignored */
 455         if (value < 0)
 456                 writeb(0, rtc->regbase + reg_off);
 457         else
 458                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 459 }
 460
 461 static int sh_rtc_check_alarm(struct rtc_time *tm)
 462 {
 463         /*
 464          * The original rtc says anything > 0xc0 is "don't care" or "match
 465          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 466          * The original rtc doesn't support years - some things use -1 and
 467          * some 0xffff. We use -1 to make out tests easier.
 468          */
 469         if (tm->tm_year == 0xffff)
 470                 tm->tm_year = -1;
 471         if (tm->tm_mon >= 0xff)
 472                 tm->tm_mon = -1;
 473         if (tm->tm_mday >= 0xff)
 474                 tm->tm_mday = -1;
 475         if (tm->tm_wday >= 0xff)
 476                 tm->tm_wday = -1;
 477         if (tm->tm_hour >= 0xff)
 478                 tm->tm_hour = -1;
 479         if (tm->tm_min >= 0xff)
 480                 tm->tm_min = -1;
 481         if (tm->tm_sec >= 0xff)
 482                 tm->tm_sec = -1;
 483
 484         if (tm->tm_year > 9999 ||
 485                 tm->tm_mon >= 12 ||
 486                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 487                 tm->tm_wday >= 7 ||
 488                 tm->tm_hour >= 24 ||
 489                 tm->tm_min >= 60 ||
 490                 tm->tm_sec >= 60)
 491                 return -EINVAL;
 492
 493         return 0;
 494 }
 495
 496 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 497 {
 498         struct platform_device *pdev = to_platform_device(dev);
 499         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 500         unsigned int rcr1;
 501         struct rtc_time *tm = &wkalrm->time;
 502         int mon, err;
 503
 504         err = sh_rtc_check_alarm(tm);
 505         if (unlikely(err < 0))
 506                 return err;
 507
 508         spin_lock_irq(&rtc->lock);
 509
 510         /* disable alarm interrupt and clear the alarm flag */
 511         rcr1 = readb(rtc->regbase + RCR1);
 512         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 513         writeb(rcr1, rtc->regbase + RCR1);
 514
 515         /* set alarm time */
 516         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 517         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 518         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 519         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 520         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 521         mon = tm->tm_mon;
 522         if (mon >= 0)
 523                 mon += 1;
 524         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 525
 526         if (wkalrm->enabled) {
 527                 rcr1 |= RCR1_AIE;
 528                 writeb(rcr1, rtc->regbase + RCR1);
 529         }
 530
 531         spin_unlock_irq(&rtc->lock);
 532
 533         return 0;
 534 }
 535
 536 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 537 {
 538         struct platform_device *pdev = to_platform_device(dev);
 539         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 540
 541         if (enabled) {
 542                 rtc->periodic_freq |= PF_KOU;
 543                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 544         } else {
 545                 rtc->periodic_freq &= ~PF_KOU;
 546                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 547         }
 548 }
 549
 550 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 551 {
 552         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 553 }
 554
 555 static struct rtc_class_ops sh_rtc_ops = {
 556         .ioctl          = sh_rtc_ioctl,
 557         .read_time      = sh_rtc_read_time,
 558         .set_time       = sh_rtc_set_time,
 559         .read_alarm     = sh_rtc_read_alarm,
 560         .set_alarm      = sh_rtc_set_alarm,
 561         .irq_set_state  = sh_rtc_irq_set_state,
 562         .irq_set_freq   = sh_rtc_irq_set_freq,
 563         .proc           = sh_rtc_proc,
 564 };
 565
 566 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 567 {
 568         struct sh_rtc *rtc;
 569         struct resource *res;
 570         unsigned int tmp;
 571         int ret;
 572
 573         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 574         if (unlikely(!rtc))
 575                 return -ENOMEM;
 576
 577         spin_lock_init(&rtc->lock);
 578
 579         /* get periodic/carry/alarm irqs */
 580         ret = platform_get_irq(pdev, 0);
 581         if (unlikely(ret < 0)) {
 582                 ret = -ENOENT;
 583                 dev_err(&pdev->dev, "No IRQ for period\n");
 584                 goto err_badres;
 585         }
 586         rtc->periodic_irq = ret;
 587
 588         ret = platform_get_irq(pdev, 1);
 589         if (unlikely(ret < 0)) {
 590                 ret = -ENOENT;
 591                 dev_err(&pdev->dev, "No IRQ for carry\n");
 592                 goto err_badres;
 593         }
 594         rtc->carry_irq = ret;
 595
 596         ret = platform_get_irq(pdev, 2);
 597         if (unlikely(ret < 0)) {
 598                 ret = -ENOENT;
 599                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 600                 goto err_badres;
 601         }
 602         rtc->alarm_irq = ret;
 603
 604         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 605         if (unlikely(res == NULL)) {
 606                 ret = -ENOENT;
 607                 dev_err(&pdev->dev, "No IO resource\n");
 608                 goto err_badres;
 609         }
 610
 611         rtc->regsize = res->end - res->start + 1;
 612
 613         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 614         if (unlikely(!rtc->res)) {
 615                 ret = -EBUSY;
 616                 goto err_badres;
 617         }
 618
 619         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 620         if (unlikely(!rtc->regbase)) {
 621                 ret = -EINVAL;
 622                 goto err_badmap;
 623         }
 624
 625         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 626                                            &sh_rtc_ops, THIS_MODULE);
 627         if (IS_ERR(rtc->rtc_dev)) {
 628                 ret = PTR_ERR(rtc->rtc_dev);
 629                 goto err_unmap;
 630         }
 631
 632         rtc->capabilities = RTC_DEF_CAPABILITIES;
 633         if (pdev->dev.platform_data) {
 634                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 635
 636                 /*
 637                  * Some CPUs have special capabilities in addition to the
 638                  * default set. Add those in here.
 639                  */
 640                 rtc->capabilities |= pinfo->capabilities;
 641         }
 642
 643         rtc->rtc_dev->max_user_freq = 256;
 644         rtc->rtc_dev->irq_freq = 1;
 645         rtc->periodic_freq = 0x60;
 646
 647         platform_set_drvdata(pdev, rtc);
 648
 649         /* register periodic/carry/alarm irqs */
 650         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 651                           "sh-rtc period", rtc);
 652         if (unlikely(ret)) {
 653                 dev_err(&pdev->dev,
 654                         "request period IRQ failed with %d, IRQ %d\n", ret,
 655                         rtc->periodic_irq);
 656                 goto err_unmap;
 657         }
 658
 659         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 660                           "sh-rtc carry", rtc);
 661         if (unlikely(ret)) {
 662                 dev_err(&pdev->dev,
 663                         "request carry IRQ failed with %d, IRQ %d\n", ret,
 664                         rtc->carry_irq);
 665                 free_irq(rtc->periodic_irq, rtc);
 666                 goto err_unmap;
 667         }
 668
 669         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 670                           "sh-rtc alarm", rtc);
 671         if (unlikely(ret)) {
 672                 dev_err(&pdev->dev,
 673                         "request alarm IRQ failed with %d, IRQ %d\n", ret,
 674                         rtc->alarm_irq);
 675                 free_irq(rtc->carry_irq, rtc);
 676                 free_irq(rtc->periodic_irq, rtc);
 677                 goto err_unmap;
 678         }
 679
 680         tmp = readb(rtc->regbase + RCR1);
 681         tmp &= ~RCR1_CF;
 682         tmp |= RCR1_CIE;
 683         writeb(tmp, rtc->regbase + RCR1);
 684
 685         return 0;
 686
 687 err_unmap:
 688         iounmap(rtc->regbase);
 689 err_badmap:
 690         release_resource(rtc->res);
 691 err_badres:
 692         kfree(rtc);
 693
 694         return ret;
 695 }
 696
 697 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 698 {
 699         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 700
 701         if (likely(rtc->rtc_dev))
 702                 rtc_device_unregister(rtc->rtc_dev);
 703
 704         sh_rtc_setpie(&pdev->dev, 0);
 705         sh_rtc_setaie(&pdev->dev, 0);
 706
 707         free_irq(rtc->carry_irq, rtc);
 708         free_irq(rtc->periodic_irq, rtc);
 709         free_irq(rtc->alarm_irq, rtc);
 710
 711         release_resource(rtc->res);
 712
 713         iounmap(rtc->regbase);
 714
 715         platform_set_drvdata(pdev, NULL);
 716
 717         kfree(rtc);
 718
 719         return 0;
 720 }
 721 static struct platform_driver sh_rtc_platform_driver = {
 722         .driver         = {
 723                 .name   = DRV_NAME,
 724                 .owner  = THIS_MODULE,
 725         },
 726         .probe          = sh_rtc_probe,
 727         .remove         = __devexit_p(sh_rtc_remove),
 728 };
 729
 730 static int __init sh_rtc_init(void)
 731 {
 732         return platform_driver_register(&sh_rtc_platform_driver);
 733 }
 734
 735 static void __exit sh_rtc_exit(void)
 736 {
 737         platform_driver_unregister(&sh_rtc_platform_driver);
 738 }
 739
 740 module_init(sh_rtc_init);
 741 module_exit(sh_rtc_exit);
 742
 743 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 744 MODULE_VERSION(DRV_VERSION);
 745 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 746               "Jamie Lenehan <lenehan@twibble.org>, "
 747               "Angelo Castello <angelo.castello@st.com>");
 748 MODULE_LICENSE("GPL");
 749 MODULE_ALIAS("platform:" DRV_NAME);