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         int alarm_irq;
  93         int periodic_irq;
  94         int carry_irq;
  95         struct rtc_device *rtc_dev;
  96         spinlock_t lock;
  97         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
  98         unsigned short periodic_freq;
  99 };
 100
 101 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 102 {
 103         struct sh_rtc *rtc = dev_id;
 104         unsigned int tmp;
 105
 106         spin_lock(&rtc->lock);
 107
 108         tmp = readb(rtc->regbase + RCR1);
 109         tmp &= ~RCR1_CF;
 110         writeb(tmp, rtc->regbase + RCR1);
 111
 112         /* Users have requested One x Second IRQ */
 113         if (rtc->periodic_freq & PF_OXS)
 114                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 115
 116         spin_unlock(&rtc->lock);
 117
 118         return IRQ_HANDLED;
 119 }
 120
 121 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 122 {
 123         struct sh_rtc *rtc = dev_id;
 124         unsigned int tmp;
 125
 126         spin_lock(&rtc->lock);
 127
 128         tmp = readb(rtc->regbase + RCR1);
 129         tmp &= ~(RCR1_AF | RCR1_AIE);
 130                 writeb(tmp, rtc->regbase + RCR1);
 131
 132         rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 133
 134         spin_unlock(&rtc->lock);
 135
 136         return IRQ_HANDLED;
 137 }
 138
 139 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 140 {
 141         struct sh_rtc *rtc = dev_id;
 142         struct rtc_device *rtc_dev = rtc->rtc_dev;
 143         unsigned int tmp;
 144
 145         spin_lock(&rtc->lock);
 146
 147         tmp = readb(rtc->regbase + RCR2);
 148         tmp &= ~RCR2_PEF;
 149         writeb(tmp, rtc->regbase + RCR2);
 150
 151         /* Half period enabled than one skipped and the next notified */
 152         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
 153                 rtc->periodic_freq &= ~PF_COUNT;
 154         else {
 155                 if (rtc->periodic_freq & PF_HP)
 156                         rtc->periodic_freq |= PF_COUNT;
 157                 if (rtc->periodic_freq & PF_KOU) {
 158                         spin_lock(&rtc_dev->irq_task_lock);
 159                         if (rtc_dev->irq_task)
 160                                 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
 161                         spin_unlock(&rtc_dev->irq_task_lock);
 162                 } else
 163                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 164         }
 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_PEF;       /* Clear PES bit */
 182                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 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 int sh_rtc_setfreq(struct device *dev, unsigned int freq)
 192 {
 193         struct sh_rtc *rtc = dev_get_drvdata(dev);
 194         int tmp, ret = 0;
 195
 196         spin_lock_irq(&rtc->lock);
 197         tmp = rtc->periodic_freq & PF_MASK;
 198
 199         switch (freq) {
 200         case 0:
 201                 rtc->periodic_freq = 0x00;
 202                 break;
 203         case 1:
 204                 rtc->periodic_freq = 0x60;
 205                 break;
 206         case 2:
 207                 rtc->periodic_freq = 0x50;
 208                 break;
 209         case 4:
 210                 rtc->periodic_freq = 0x40;
 211                 break;
 212         case 8:
 213                 rtc->periodic_freq = 0x30 | PF_HP;
 214                 break;
 215         case 16:
 216                 rtc->periodic_freq = 0x30;
 217                 break;
 218         case 32:
 219                 rtc->periodic_freq = 0x20 | PF_HP;
 220                 break;
 221         case 64:
 222                 rtc->periodic_freq = 0x20;
 223                 break;
 224         case 128:
 225                 rtc->periodic_freq = 0x10 | PF_HP;
 226                 break;
 227         case 256:
 228                 rtc->periodic_freq = 0x10;
 229                 break;
 230         default:
 231                 ret = -ENOTSUPP;
 232         }
 233
 234         if (ret == 0) {
 235                 rtc->periodic_freq |= tmp;
 236                 rtc->rtc_dev->irq_freq = freq;
 237         }
 238
 239         spin_unlock_irq(&rtc->lock);
 240         return ret;
 241 }
 242
 243 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 244 {
 245         struct sh_rtc *rtc = dev_get_drvdata(dev);
 246         unsigned int tmp;
 247
 248         spin_lock_irq(&rtc->lock);
 249
 250         tmp = readb(rtc->regbase + RCR1);
 251
 252         if (!enable)
 253                 tmp &= ~RCR1_AIE;
 254         else
 255                 tmp |= RCR1_AIE;
 256
 257         writeb(tmp, rtc->regbase + RCR1);
 258
 259         spin_unlock_irq(&rtc->lock);
 260 }
 261
 262 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 263 {
 264         struct sh_rtc *rtc = dev_get_drvdata(dev);
 265         unsigned int tmp;
 266
 267         tmp = readb(rtc->regbase + RCR1);
 268         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 269
 270         tmp = readb(rtc->regbase + RCR2);
 271         seq_printf(seq, "periodic_IRQ\t: %s\n",
 272                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 273
 274         return 0;
 275 }
 276
 277 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 278 {
 279         struct sh_rtc *rtc = dev_get_drvdata(dev);
 280         unsigned int ret = 0;
 281
 282         switch (cmd) {
 283         case RTC_PIE_OFF:
 284         case RTC_PIE_ON:
 285                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 286                 break;
 287         case RTC_AIE_OFF:
 288         case RTC_AIE_ON:
 289                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 290                 break;
 291         case RTC_UIE_OFF:
 292                 rtc->periodic_freq &= ~PF_OXS;
 293                 break;
 294         case RTC_UIE_ON:
 295                 rtc->periodic_freq |= PF_OXS;
 296                 break;
 297         case RTC_IRQP_READ:
 298                 ret = put_user(rtc->rtc_dev->irq_freq,
 299                                (unsigned long __user *)arg);
 300                 break;
 301         case RTC_IRQP_SET:
 302                 ret = sh_rtc_setfreq(dev, arg);
 303                 break;
 304         default:
 305                 ret = -ENOIOCTLCMD;
 306         }
 307
 308         return ret;
 309 }
 310
 311 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 312 {
 313         struct platform_device *pdev = to_platform_device(dev);
 314         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 315         unsigned int sec128, sec2, yr, yr100, cf_bit;
 316
 317         do {
 318                 unsigned int tmp;
 319
 320                 spin_lock_irq(&rtc->lock);
 321
 322                 tmp = readb(rtc->regbase + RCR1);
 323                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 324                 tmp |= RCR1_CIE;
 325                 writeb(tmp, rtc->regbase + RCR1);
 326
 327                 sec128 = readb(rtc->regbase + R64CNT);
 328
 329                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 330                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 331                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 332                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 333                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 334                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 335
 336                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 337                         yr  = readw(rtc->regbase + RYRCNT);
 338                         yr100 = bcd2bin(yr >> 8);
 339                         yr &= 0xff;
 340                 } else {
 341                         yr  = readb(rtc->regbase + RYRCNT);
 342                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 343                 }
 344
 345                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 346
 347                 sec2 = readb(rtc->regbase + R64CNT);
 348                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 349
 350                 spin_unlock_irq(&rtc->lock);
 351         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 352
 353 #if RTC_BIT_INVERTED != 0
 354         if ((sec128 & RTC_BIT_INVERTED))
 355                 tm->tm_sec--;
 356 #endif
 357
 358         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 359                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 360                 __func__,
 361                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 362                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 363
 364         if (rtc_valid_tm(tm) < 0) {
 365                 dev_err(dev, "invalid date\n");
 366                 rtc_time_to_tm(0, tm);
 367         }
 368
 369         return 0;
 370 }
 371
 372 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 373 {
 374         struct platform_device *pdev = to_platform_device(dev);
 375         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 376         unsigned int tmp;
 377         int year;
 378
 379         spin_lock_irq(&rtc->lock);
 380
 381         /* Reset pre-scaler & stop RTC */
 382         tmp = readb(rtc->regbase + RCR2);
 383         tmp |= RCR2_RESET;
 384         tmp &= ~RCR2_START;
 385         writeb(tmp, rtc->regbase + RCR2);
 386
 387         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 388         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 389         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 390         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 391         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 392         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 393
 394         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 395                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 396                         bin2bcd(tm->tm_year % 100);
 397                 writew(year, rtc->regbase + RYRCNT);
 398         } else {
 399                 year = tm->tm_year % 100;
 400                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 401         }
 402
 403         /* Start RTC */
 404         tmp = readb(rtc->regbase + RCR2);
 405         tmp &= ~RCR2_RESET;
 406         tmp |= RCR2_RTCEN | RCR2_START;
 407         writeb(tmp, rtc->regbase + RCR2);
 408
 409         spin_unlock_irq(&rtc->lock);
 410
 411         return 0;
 412 }
 413
 414 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 415 {
 416         unsigned int byte;
 417         int value = 0xff;       /* return 0xff for ignored values */
 418
 419         byte = readb(rtc->regbase + reg_off);
 420         if (byte & AR_ENB) {
 421                 byte &= ~AR_ENB;        /* strip the enable bit */
 422                 value = bcd2bin(byte);
 423         }
 424
 425         return value;
 426 }
 427
 428 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 429 {
 430         struct platform_device *pdev = to_platform_device(dev);
 431         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 432         struct rtc_time *tm = &wkalrm->time;
 433
 434         spin_lock_irq(&rtc->lock);
 435
 436         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 437         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 438         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 439         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 440         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 441         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 442         if (tm->tm_mon > 0)
 443                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 444         tm->tm_year     = 0xffff;
 445
 446         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 447
 448         spin_unlock_irq(&rtc->lock);
 449
 450         return 0;
 451 }
 452
 453 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 454                                             int value, int reg_off)
 455 {
 456         /* < 0 for a value that is ignored */
 457         if (value < 0)
 458                 writeb(0, rtc->regbase + reg_off);
 459         else
 460                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 461 }
 462
 463 static int sh_rtc_check_alarm(struct rtc_time *tm)
 464 {
 465         /*
 466          * The original rtc says anything > 0xc0 is "don't care" or "match
 467          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 468          * The original rtc doesn't support years - some things use -1 and
 469          * some 0xffff. We use -1 to make out tests easier.
 470          */
 471         if (tm->tm_year == 0xffff)
 472                 tm->tm_year = -1;
 473         if (tm->tm_mon >= 0xff)
 474                 tm->tm_mon = -1;
 475         if (tm->tm_mday >= 0xff)
 476                 tm->tm_mday = -1;
 477         if (tm->tm_wday >= 0xff)
 478                 tm->tm_wday = -1;
 479         if (tm->tm_hour >= 0xff)
 480                 tm->tm_hour = -1;
 481         if (tm->tm_min >= 0xff)
 482                 tm->tm_min = -1;
 483         if (tm->tm_sec >= 0xff)
 484                 tm->tm_sec = -1;
 485
 486         if (tm->tm_year > 9999 ||
 487                 tm->tm_mon >= 12 ||
 488                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 489                 tm->tm_wday >= 7 ||
 490                 tm->tm_hour >= 24 ||
 491                 tm->tm_min >= 60 ||
 492                 tm->tm_sec >= 60)
 493                 return -EINVAL;
 494
 495         return 0;
 496 }
 497
 498 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 499 {
 500         struct platform_device *pdev = to_platform_device(dev);
 501         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 502         unsigned int rcr1;
 503         struct rtc_time *tm = &wkalrm->time;
 504         int mon, err;
 505
 506         err = sh_rtc_check_alarm(tm);
 507         if (unlikely(err < 0))
 508                 return err;
 509
 510         spin_lock_irq(&rtc->lock);
 511
 512         /* disable alarm interrupt and clear the alarm flag */
 513         rcr1 = readb(rtc->regbase + RCR1);
 514         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 515         writeb(rcr1, rtc->regbase + RCR1);
 516
 517         /* set alarm time */
 518         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 519         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 520         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 521         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 522         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 523         mon = tm->tm_mon;
 524         if (mon >= 0)
 525                 mon += 1;
 526         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 527
 528         if (wkalrm->enabled) {
 529                 rcr1 |= RCR1_AIE;
 530                 writeb(rcr1, rtc->regbase + RCR1);
 531         }
 532
 533         spin_unlock_irq(&rtc->lock);
 534
 535         return 0;
 536 }
 537
 538 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 539 {
 540         struct platform_device *pdev = to_platform_device(dev);
 541         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 542
 543         if (enabled) {
 544                 rtc->periodic_freq |= PF_KOU;
 545                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 546         } else {
 547                 rtc->periodic_freq &= ~PF_KOU;
 548                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 549         }
 550 }
 551
 552 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 553 {
 554         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 555 }
 556
 557 static struct rtc_class_ops sh_rtc_ops = {
 558         .ioctl          = sh_rtc_ioctl,
 559         .read_time      = sh_rtc_read_time,
 560         .set_time       = sh_rtc_set_time,
 561         .read_alarm     = sh_rtc_read_alarm,
 562         .set_alarm      = sh_rtc_set_alarm,
 563         .irq_set_state  = sh_rtc_irq_set_state,
 564         .irq_set_freq   = sh_rtc_irq_set_freq,
 565         .proc           = sh_rtc_proc,
 566 };
 567
 568 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 569 {
 570         struct sh_rtc *rtc;
 571         struct resource *res;
 572         unsigned int tmp;
 573         int ret;
 574
 575         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 576         if (unlikely(!rtc))
 577                 return -ENOMEM;
 578
 579         spin_lock_init(&rtc->lock);
 580
 581         /* get periodic/carry/alarm irqs */
 582         ret = platform_get_irq(pdev, 0);
 583         if (unlikely(ret <= 0)) {
 584                 ret = -ENOENT;
 585                 dev_err(&pdev->dev, "No IRQ for period\n");
 586                 goto err_badres;
 587         }
 588         rtc->periodic_irq = ret;
 589
 590         ret = platform_get_irq(pdev, 1);
 591         if (unlikely(ret <= 0)) {
 592                 ret = -ENOENT;
 593                 dev_err(&pdev->dev, "No IRQ for carry\n");
 594                 goto err_badres;
 595         }
 596         rtc->carry_irq = ret;
 597
 598         ret = platform_get_irq(pdev, 2);
 599         if (unlikely(ret <= 0)) {
 600                 ret = -ENOENT;
 601                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 602                 goto err_badres;
 603         }
 604         rtc->alarm_irq = ret;
 605
 606         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 607         if (unlikely(res == NULL)) {
 608                 ret = -ENOENT;
 609                 dev_err(&pdev->dev, "No IO resource\n");
 610                 goto err_badres;
 611         }
 612
 613         rtc->regsize = res->end - res->start + 1;
 614
 615         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 616         if (unlikely(!rtc->res)) {
 617                 ret = -EBUSY;
 618                 goto err_badres;
 619         }
 620
 621         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 622         if (unlikely(!rtc->regbase)) {
 623                 ret = -EINVAL;
 624                 goto err_badmap;
 625         }
 626
 627         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 628                                            &sh_rtc_ops, THIS_MODULE);
 629         if (IS_ERR(rtc->rtc_dev)) {
 630                 ret = PTR_ERR(rtc->rtc_dev);
 631                 goto err_unmap;
 632         }
 633
 634         rtc->capabilities = RTC_DEF_CAPABILITIES;
 635         if (pdev->dev.platform_data) {
 636                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 637
 638                 /*
 639                  * Some CPUs have special capabilities in addition to the
 640                  * default set. Add those in here.
 641                  */
 642                 rtc->capabilities |= pinfo->capabilities;
 643         }
 644
 645         rtc->rtc_dev->max_user_freq = 256;
 646         rtc->rtc_dev->irq_freq = 1;
 647         rtc->periodic_freq = 0x60;
 648
 649         platform_set_drvdata(pdev, rtc);
 650
 651         /* register periodic/carry/alarm irqs */
 652         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 653                           "sh-rtc period", rtc);
 654         if (unlikely(ret)) {
 655                 dev_err(&pdev->dev,
 656                         "request period IRQ failed with %d, IRQ %d\n", ret,
 657                         rtc->periodic_irq);
 658                 goto err_unmap;
 659         }
 660
 661         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 662                           "sh-rtc carry", rtc);
 663         if (unlikely(ret)) {
 664                 dev_err(&pdev->dev,
 665                         "request carry IRQ failed with %d, IRQ %d\n", ret,
 666                         rtc->carry_irq);
 667                 free_irq(rtc->periodic_irq, rtc);
 668                 goto err_unmap;
 669         }
 670
 671         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 672                           "sh-rtc alarm", rtc);
 673         if (unlikely(ret)) {
 674                 dev_err(&pdev->dev,
 675                         "request alarm IRQ failed with %d, IRQ %d\n", ret,
 676                         rtc->alarm_irq);
 677                 free_irq(rtc->carry_irq, rtc);
 678                 free_irq(rtc->periodic_irq, rtc);
 679                 goto err_unmap;
 680         }
 681
 682         tmp = readb(rtc->regbase + RCR1);
 683         tmp &= ~RCR1_CF;
 684         tmp |= RCR1_CIE;
 685         writeb(tmp, rtc->regbase + RCR1);
 686
 687         return 0;
 688
 689 err_unmap:
 690         iounmap(rtc->regbase);
 691 err_badmap:
 692         release_resource(rtc->res);
 693 err_badres:
 694         kfree(rtc);
 695
 696         return ret;
 697 }
 698
 699 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 700 {
 701         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 702
 703         if (likely(rtc->rtc_dev))
 704                 rtc_device_unregister(rtc->rtc_dev);
 705
 706         sh_rtc_setpie(&pdev->dev, 0);
 707         sh_rtc_setaie(&pdev->dev, 0);
 708
 709         free_irq(rtc->carry_irq, rtc);
 710         free_irq(rtc->periodic_irq, rtc);
 711         free_irq(rtc->alarm_irq, rtc);
 712
 713         release_resource(rtc->res);
 714
 715         iounmap(rtc->regbase);
 716
 717         platform_set_drvdata(pdev, NULL);
 718
 719         kfree(rtc);
 720
 721         return 0;
 722 }
 723 static struct platform_driver sh_rtc_platform_driver = {
 724         .driver         = {
 725                 .name   = DRV_NAME,
 726                 .owner  = THIS_MODULE,
 727         },
 728         .probe          = sh_rtc_probe,
 729         .remove         = __devexit_p(sh_rtc_remove),
 730 };
 731
 732 static int __init sh_rtc_init(void)
 733 {
 734         return platform_driver_register(&sh_rtc_platform_driver);
 735 }
 736
 737 static void __exit sh_rtc_exit(void)
 738 {
 739         platform_driver_unregister(&sh_rtc_platform_driver);
 740 }
 741
 742 module_init(sh_rtc_init);
 743 module_exit(sh_rtc_exit);
 744
 745 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 746 MODULE_VERSION(DRV_VERSION);
 747 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 748               "Jamie Lenehan <lenehan@twibble.org>, "
 749               "Angelo Castello <angelo.castello@st.com>");
 750 MODULE_LICENSE("GPL");
 751 MODULE_ALIAS("platform:" DRV_NAME);