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 void sh_rtc_release(struct device *dev)
 261 {
 262         sh_rtc_setpie(dev, 0);
 263         sh_rtc_setaie(dev, 0);
 264 }
 265
 266 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 267 {
 268         struct sh_rtc *rtc = dev_get_drvdata(dev);
 269         unsigned int tmp;
 270
 271         tmp = readb(rtc->regbase + RCR1);
 272         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 273
 274         tmp = readb(rtc->regbase + RCR2);
 275         seq_printf(seq, "periodic_IRQ\t: %s\n",
 276                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 277
 278         return 0;
 279 }
 280
 281 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 282 {
 283         struct sh_rtc *rtc = dev_get_drvdata(dev);
 284         unsigned int ret = 0;
 285
 286         switch (cmd) {
 287         case RTC_PIE_OFF:
 288         case RTC_PIE_ON:
 289                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 290                 break;
 291         case RTC_AIE_OFF:
 292         case RTC_AIE_ON:
 293                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 294                 break;
 295         case RTC_UIE_OFF:
 296                 rtc->periodic_freq &= ~PF_OXS;
 297                 break;
 298         case RTC_UIE_ON:
 299                 rtc->periodic_freq |= PF_OXS;
 300                 break;
 301         case RTC_IRQP_READ:
 302                 ret = put_user(rtc->rtc_dev->irq_freq,
 303                                (unsigned long __user *)arg);
 304                 break;
 305         case RTC_IRQP_SET:
 306                 ret = sh_rtc_setfreq(dev, arg);
 307                 break;
 308         default:
 309                 ret = -ENOIOCTLCMD;
 310         }
 311
 312         return ret;
 313 }
 314
 315 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 316 {
 317         struct platform_device *pdev = to_platform_device(dev);
 318         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 319         unsigned int sec128, sec2, yr, yr100, cf_bit;
 320
 321         do {
 322                 unsigned int tmp;
 323
 324                 spin_lock_irq(&rtc->lock);
 325
 326                 tmp = readb(rtc->regbase + RCR1);
 327                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 328                 tmp |= RCR1_CIE;
 329                 writeb(tmp, rtc->regbase + RCR1);
 330
 331                 sec128 = readb(rtc->regbase + R64CNT);
 332
 333                 tm->tm_sec      = BCD2BIN(readb(rtc->regbase + RSECCNT));
 334                 tm->tm_min      = BCD2BIN(readb(rtc->regbase + RMINCNT));
 335                 tm->tm_hour     = BCD2BIN(readb(rtc->regbase + RHRCNT));
 336                 tm->tm_wday     = BCD2BIN(readb(rtc->regbase + RWKCNT));
 337                 tm->tm_mday     = BCD2BIN(readb(rtc->regbase + RDAYCNT));
 338                 tm->tm_mon      = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
 339
 340                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 341                         yr  = readw(rtc->regbase + RYRCNT);
 342                         yr100 = BCD2BIN(yr >> 8);
 343                         yr &= 0xff;
 344                 } else {
 345                         yr  = readb(rtc->regbase + RYRCNT);
 346                         yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
 347                 }
 348
 349                 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
 350
 351                 sec2 = readb(rtc->regbase + R64CNT);
 352                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 353
 354                 spin_unlock_irq(&rtc->lock);
 355         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 356
 357 #if RTC_BIT_INVERTED != 0
 358         if ((sec128 & RTC_BIT_INVERTED))
 359                 tm->tm_sec--;
 360 #endif
 361
 362         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 363                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 364                 __func__,
 365                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 366                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 367
 368         if (rtc_valid_tm(tm) < 0) {
 369                 dev_err(dev, "invalid date\n");
 370                 rtc_time_to_tm(0, tm);
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 377 {
 378         struct platform_device *pdev = to_platform_device(dev);
 379         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 380         unsigned int tmp;
 381         int year;
 382
 383         spin_lock_irq(&rtc->lock);
 384
 385         /* Reset pre-scaler & stop RTC */
 386         tmp = readb(rtc->regbase + RCR2);
 387         tmp |= RCR2_RESET;
 388         tmp &= ~RCR2_START;
 389         writeb(tmp, rtc->regbase + RCR2);
 390
 391         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
 392         writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
 393         writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
 394         writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
 395         writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
 396         writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 397
 398         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 399                 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
 400                         BIN2BCD(tm->tm_year % 100);
 401                 writew(year, rtc->regbase + RYRCNT);
 402         } else {
 403                 year = tm->tm_year % 100;
 404                 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
 405         }
 406
 407         /* Start RTC */
 408         tmp = readb(rtc->regbase + RCR2);
 409         tmp &= ~RCR2_RESET;
 410         tmp |= RCR2_RTCEN | RCR2_START;
 411         writeb(tmp, rtc->regbase + RCR2);
 412
 413         spin_unlock_irq(&rtc->lock);
 414
 415         return 0;
 416 }
 417
 418 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 419 {
 420         unsigned int byte;
 421         int value = 0xff;       /* return 0xff for ignored values */
 422
 423         byte = readb(rtc->regbase + reg_off);
 424         if (byte & AR_ENB) {
 425                 byte &= ~AR_ENB;        /* strip the enable bit */
 426                 value = BCD2BIN(byte);
 427         }
 428
 429         return value;
 430 }
 431
 432 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 433 {
 434         struct platform_device *pdev = to_platform_device(dev);
 435         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 436         struct rtc_time *tm = &wkalrm->time;
 437
 438         spin_lock_irq(&rtc->lock);
 439
 440         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 441         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 442         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 443         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 444         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 445         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 446         if (tm->tm_mon > 0)
 447                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 448         tm->tm_year     = 0xffff;
 449
 450         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 451
 452         spin_unlock_irq(&rtc->lock);
 453
 454         return 0;
 455 }
 456
 457 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 458                                             int value, int reg_off)
 459 {
 460         /* < 0 for a value that is ignored */
 461         if (value < 0)
 462                 writeb(0, rtc->regbase + reg_off);
 463         else
 464                 writeb(BIN2BCD(value) | AR_ENB,  rtc->regbase + reg_off);
 465 }
 466
 467 static int sh_rtc_check_alarm(struct rtc_time *tm)
 468 {
 469         /*
 470          * The original rtc says anything > 0xc0 is "don't care" or "match
 471          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 472          * The original rtc doesn't support years - some things use -1 and
 473          * some 0xffff. We use -1 to make out tests easier.
 474          */
 475         if (tm->tm_year == 0xffff)
 476                 tm->tm_year = -1;
 477         if (tm->tm_mon >= 0xff)
 478                 tm->tm_mon = -1;
 479         if (tm->tm_mday >= 0xff)
 480                 tm->tm_mday = -1;
 481         if (tm->tm_wday >= 0xff)
 482                 tm->tm_wday = -1;
 483         if (tm->tm_hour >= 0xff)
 484                 tm->tm_hour = -1;
 485         if (tm->tm_min >= 0xff)
 486                 tm->tm_min = -1;
 487         if (tm->tm_sec >= 0xff)
 488                 tm->tm_sec = -1;
 489
 490         if (tm->tm_year > 9999 ||
 491                 tm->tm_mon >= 12 ||
 492                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 493                 tm->tm_wday >= 7 ||
 494                 tm->tm_hour >= 24 ||
 495                 tm->tm_min >= 60 ||
 496                 tm->tm_sec >= 60)
 497                 return -EINVAL;
 498
 499         return 0;
 500 }
 501
 502 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 503 {
 504         struct platform_device *pdev = to_platform_device(dev);
 505         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 506         unsigned int rcr1;
 507         struct rtc_time *tm = &wkalrm->time;
 508         int mon, err;
 509
 510         err = sh_rtc_check_alarm(tm);
 511         if (unlikely(err < 0))
 512                 return err;
 513
 514         spin_lock_irq(&rtc->lock);
 515
 516         /* disable alarm interrupt and clear the alarm flag */
 517         rcr1 = readb(rtc->regbase + RCR1);
 518         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 519         writeb(rcr1, rtc->regbase + RCR1);
 520
 521         /* set alarm time */
 522         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 523         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 524         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 525         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 526         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 527         mon = tm->tm_mon;
 528         if (mon >= 0)
 529                 mon += 1;
 530         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 531
 532         if (wkalrm->enabled) {
 533                 rcr1 |= RCR1_AIE;
 534                 writeb(rcr1, rtc->regbase + RCR1);
 535         }
 536
 537         spin_unlock_irq(&rtc->lock);
 538
 539         return 0;
 540 }
 541
 542 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 543 {
 544         struct platform_device *pdev = to_platform_device(dev);
 545         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 546
 547         if (enabled) {
 548                 rtc->periodic_freq |= PF_KOU;
 549                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 550         } else {
 551                 rtc->periodic_freq &= ~PF_KOU;
 552                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 553         }
 554 }
 555
 556 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 557 {
 558         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 559 }
 560
 561 static struct rtc_class_ops sh_rtc_ops = {
 562         .release        = sh_rtc_release,
 563         .ioctl          = sh_rtc_ioctl,
 564         .read_time      = sh_rtc_read_time,
 565         .set_time       = sh_rtc_set_time,
 566         .read_alarm     = sh_rtc_read_alarm,
 567         .set_alarm      = sh_rtc_set_alarm,
 568         .irq_set_state  = sh_rtc_irq_set_state,
 569         .irq_set_freq   = sh_rtc_irq_set_freq,
 570         .proc           = sh_rtc_proc,
 571 };
 572
 573 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 574 {
 575         struct sh_rtc *rtc;
 576         struct resource *res;
 577         unsigned int tmp;
 578         int ret = -ENOENT;
 579
 580         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 581         if (unlikely(!rtc))
 582                 return -ENOMEM;
 583
 584         spin_lock_init(&rtc->lock);
 585
 586         /* get periodic/carry/alarm irqs */
 587         rtc->periodic_irq = platform_get_irq(pdev, 0);
 588         if (unlikely(rtc->periodic_irq < 0)) {
 589                 dev_err(&pdev->dev, "No IRQ for period\n");
 590                 goto err_badres;
 591         }
 592
 593         rtc->carry_irq = platform_get_irq(pdev, 1);
 594         if (unlikely(rtc->carry_irq < 0)) {
 595                 dev_err(&pdev->dev, "No IRQ for carry\n");
 596                 goto err_badres;
 597         }
 598
 599         rtc->alarm_irq = platform_get_irq(pdev, 2);
 600         if (unlikely(rtc->alarm_irq < 0)) {
 601                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 602                 goto err_badres;
 603         }
 604
 605         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 606         if (unlikely(res == NULL)) {
 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);