git.oblomov.eu Git - linux-2.6/blob - 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 <linux/log2.h>
  28 #include <asm/rtc.h>
  29
  30 #define DRV_NAME        "sh-rtc"
  31 #define DRV_VERSION     "0.2.0"
  32
  33 #define RTC_REG(r)      ((r) * rtc_reg_size)
  34
  35 #define R64CNT          RTC_REG(0)
  36
  37 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  38 #define RMINCNT         RTC_REG(2)      /* RTC min */
  39 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  40 #define RWKCNT          RTC_REG(4)      /* RTC week */
  41 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  42 #define RMONCNT         RTC_REG(6)      /* RTC month */
  43 #define RYRCNT          RTC_REG(7)      /* RTC year */
  44 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  45 #define RMINAR          RTC_REG(9)      /* ALARM min */
  46 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  47 #define RWKAR           RTC_REG(11)     /* ALARM week */
  48 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  49 #define RMONAR          RTC_REG(13)     /* ALARM month */
  50 #define RCR1            RTC_REG(14)     /* Control */
  51 #define RCR2            RTC_REG(15)     /* Control */
  52
  53 /*
  54  * Note on RYRAR and RCR3: Up until this point most of the register
  55  * definitions are consistent across all of the available parts. However,
  56  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  57  * register used to control RYRCNT/RYRAR compare) varies considerably
  58  * across various parts, occasionally being mapped in to a completely
  59  * unrelated address space. For proper RYRAR support a separate resource
  60  * would have to be handed off, but as this is purely optional in
  61  * practice, we simply opt not to support it, thereby keeping the code
  62  * quite a bit more simplified.
  63  */
  64
  65 /* ALARM Bits - or with BCD encoded value */
  66 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  67
  68 /* Period Bits */
  69 #define PF_HP           0x100   /* Enable Half Period to support 8,32,128Hz */
  70 #define PF_COUNT        0x200   /* Half periodic counter */
  71 #define PF_OXS          0x400   /* Periodic One x Second */
  72 #define PF_KOU          0x800   /* Kernel or User periodic request 1=kernel */
  73 #define PF_MASK         0xf00
  74
  75 /* RCR1 Bits */
  76 #define RCR1_CF         0x80    /* Carry Flag             */
  77 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  78 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  79 #define RCR1_AF         0x01    /* Alarm Flag             */
  80
  81 /* RCR2 Bits */
  82 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  83 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  84 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  85 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  86 #define RCR2_RESET      0x02    /* Reset bit               */
  87 #define RCR2_START      0x01    /* Start bit               */
  88
  89 struct sh_rtc {
  90         void __iomem *regbase;
  91         unsigned long regsize;
  92         struct resource *res;
  93         int alarm_irq;
  94         int periodic_irq;
  95         int carry_irq;
  96         struct rtc_device *rtc_dev;
  97         spinlock_t lock;
  98         unsigned long capabilities;     /* See asm-sh/rtc.h for cap bits */
  99         unsigned short periodic_freq;
 100 };
 101
 102 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 103 {
 104         struct sh_rtc *rtc = dev_id;
 105         unsigned int tmp;
 106
 107         spin_lock(&rtc->lock);
 108
 109         tmp = readb(rtc->regbase + RCR1);
 110         tmp &= ~RCR1_CF;
 111         writeb(tmp, rtc->regbase + RCR1);
 112
 113         /* Users have requested One x Second IRQ */
 114         if (rtc->periodic_freq & PF_OXS)
 115                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 116
 117         spin_unlock(&rtc->lock);
 118
 119         return IRQ_HANDLED;
 120 }
 121
 122 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 123 {
 124         struct sh_rtc *rtc = dev_id;
 125         unsigned int tmp;
 126
 127         spin_lock(&rtc->lock);
 128
 129         tmp = readb(rtc->regbase + RCR1);
 130         tmp &= ~(RCR1_AF | RCR1_AIE);
 131                 writeb(tmp, rtc->regbase + RCR1);
 132
 133         rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 134
 135         spin_unlock(&rtc->lock);
 136
 137         return IRQ_HANDLED;
 138 }
 139
 140 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 141 {
 142         struct sh_rtc *rtc = dev_id;
 143         struct rtc_device *rtc_dev = rtc->rtc_dev;
 144         unsigned int tmp;
 145
 146         spin_lock(&rtc->lock);
 147
 148         tmp = readb(rtc->regbase + RCR2);
 149         tmp &= ~RCR2_PEF;
 150         writeb(tmp, rtc->regbase + RCR2);
 151
 152         /* Half period enabled than one skipped and the next notified */
 153         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
 154                 rtc->periodic_freq &= ~PF_COUNT;
 155         else {
 156                 if (rtc->periodic_freq & PF_HP)
 157                         rtc->periodic_freq |= PF_COUNT;
 158                 if (rtc->periodic_freq & PF_KOU) {
 159                         spin_lock(&rtc_dev->irq_task_lock);
 160                         if (rtc_dev->irq_task)
 161                                 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
 162                         spin_unlock(&rtc_dev->irq_task_lock);
 163                 } else
 164                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 165         }
 166
 167         spin_unlock(&rtc->lock);
 168
 169         return IRQ_HANDLED;
 170 }
 171
 172 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 173 {
 174         struct sh_rtc *rtc = dev_get_drvdata(dev);
 175         unsigned int tmp;
 176
 177         spin_lock_irq(&rtc->lock);
 178
 179         tmp = readb(rtc->regbase + RCR2);
 180
 181         if (enable) {
 182                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
 183                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 184         } else
 185                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 186
 187         writeb(tmp, rtc->regbase + RCR2);
 188
 189         spin_unlock_irq(&rtc->lock);
 190 }
 191
 192 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
 193 {
 194         struct sh_rtc *rtc = dev_get_drvdata(dev);
 195         int tmp, ret = 0;
 196
 197         spin_lock_irq(&rtc->lock);
 198         tmp = rtc->periodic_freq & PF_MASK;
 199
 200         switch (freq) {
 201         case 0:
 202                 rtc->periodic_freq = 0x00;
 203                 break;
 204         case 1:
 205                 rtc->periodic_freq = 0x60;
 206                 break;
 207         case 2:
 208                 rtc->periodic_freq = 0x50;
 209                 break;
 210         case 4:
 211                 rtc->periodic_freq = 0x40;
 212                 break;
 213         case 8:
 214                 rtc->periodic_freq = 0x30 | PF_HP;
 215                 break;
 216         case 16:
 217                 rtc->periodic_freq = 0x30;
 218                 break;
 219         case 32:
 220                 rtc->periodic_freq = 0x20 | PF_HP;
 221                 break;
 222         case 64:
 223                 rtc->periodic_freq = 0x20;
 224                 break;
 225         case 128:
 226                 rtc->periodic_freq = 0x10 | PF_HP;
 227                 break;
 228         case 256:
 229                 rtc->periodic_freq = 0x10;
 230                 break;
 231         default:
 232                 ret = -ENOTSUPP;
 233         }
 234
 235         if (ret == 0) {
 236                 rtc->periodic_freq |= tmp;
 237                 rtc->rtc_dev->irq_freq = freq;
 238         }
 239
 240         spin_unlock_irq(&rtc->lock);
 241         return ret;
 242 }
 243
 244 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 245 {
 246         struct sh_rtc *rtc = dev_get_drvdata(dev);
 247         unsigned int tmp;
 248
 249         spin_lock_irq(&rtc->lock);
 250
 251         tmp = readb(rtc->regbase + RCR1);
 252
 253         if (!enable)
 254                 tmp &= ~RCR1_AIE;
 255         else
 256                 tmp |= RCR1_AIE;
 257
 258         writeb(tmp, rtc->regbase + RCR1);
 259
 260         spin_unlock_irq(&rtc->lock);
 261 }
 262
 263 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 264 {
 265         struct sh_rtc *rtc = dev_get_drvdata(dev);
 266         unsigned int tmp;
 267
 268         tmp = readb(rtc->regbase + RCR1);
 269         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 270
 271         tmp = readb(rtc->regbase + RCR2);
 272         seq_printf(seq, "periodic_IRQ\t: %s\n",
 273                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 274
 275         return 0;
 276 }
 277
 278 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 279 {
 280         struct sh_rtc *rtc = dev_get_drvdata(dev);
 281         unsigned int ret = 0;
 282
 283         switch (cmd) {
 284         case RTC_PIE_OFF:
 285         case RTC_PIE_ON:
 286                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 287                 break;
 288         case RTC_AIE_OFF:
 289         case RTC_AIE_ON:
 290                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 291                 break;
 292         case RTC_UIE_OFF:
 293                 rtc->periodic_freq &= ~PF_OXS;
 294                 break;
 295         case RTC_UIE_ON:
 296                 rtc->periodic_freq |= PF_OXS;
 297                 break;
 298         case RTC_IRQP_READ:
 299                 ret = put_user(rtc->rtc_dev->irq_freq,
 300                                (unsigned long __user *)arg);
 301                 break;
 302         case RTC_IRQP_SET:
 303                 ret = sh_rtc_setfreq(dev, arg);
 304                 break;
 305         default:
 306                 ret = -ENOIOCTLCMD;
 307         }
 308
 309         return ret;
 310 }
 311
 312 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 313 {
 314         struct platform_device *pdev = to_platform_device(dev);
 315         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 316         unsigned int sec128, sec2, yr, yr100, cf_bit;
 317
 318         do {
 319                 unsigned int tmp;
 320
 321                 spin_lock_irq(&rtc->lock);
 322
 323                 tmp = readb(rtc->regbase + RCR1);
 324                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 325                 tmp |= RCR1_CIE;
 326                 writeb(tmp, rtc->regbase + RCR1);
 327
 328                 sec128 = readb(rtc->regbase + R64CNT);
 329
 330                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 331                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 332                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 333                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 334                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 335                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 336
 337                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 338                         yr  = readw(rtc->regbase + RYRCNT);
 339                         yr100 = bcd2bin(yr >> 8);
 340                         yr &= 0xff;
 341                 } else {
 342                         yr  = readb(rtc->regbase + RYRCNT);
 343                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 344                 }
 345
 346                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 347
 348                 sec2 = readb(rtc->regbase + R64CNT);
 349                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 350
 351                 spin_unlock_irq(&rtc->lock);
 352         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 353
 354 #if RTC_BIT_INVERTED != 0
 355         if ((sec128 & RTC_BIT_INVERTED))
 356                 tm->tm_sec--;
 357 #endif
 358
 359         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 360                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 361                 __func__,
 362                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 363                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 364
 365         if (rtc_valid_tm(tm) < 0) {
 366                 dev_err(dev, "invalid date\n");
 367                 rtc_time_to_tm(0, tm);
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 374 {
 375         struct platform_device *pdev = to_platform_device(dev);
 376         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 377         unsigned int tmp;
 378         int year;
 379
 380         spin_lock_irq(&rtc->lock);
 381
 382         /* Reset pre-scaler & stop RTC */
 383         tmp = readb(rtc->regbase + RCR2);
 384         tmp |= RCR2_RESET;
 385         tmp &= ~RCR2_START;
 386         writeb(tmp, rtc->regbase + RCR2);
 387
 388         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 389         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 390         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 391         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 392         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 393         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 394
 395         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 396                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 397                         bin2bcd(tm->tm_year % 100);
 398                 writew(year, rtc->regbase + RYRCNT);
 399         } else {
 400                 year = tm->tm_year % 100;
 401                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 402         }
 403
 404         /* Start RTC */
 405         tmp = readb(rtc->regbase + RCR2);
 406         tmp &= ~RCR2_RESET;
 407         tmp |= RCR2_RTCEN | RCR2_START;
 408         writeb(tmp, rtc->regbase + RCR2);
 409
 410         spin_unlock_irq(&rtc->lock);
 411
 412         return 0;
 413 }
 414
 415 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 416 {
 417         unsigned int byte;
 418         int value = 0xff;       /* return 0xff for ignored values */
 419
 420         byte = readb(rtc->regbase + reg_off);
 421         if (byte & AR_ENB) {
 422                 byte &= ~AR_ENB;        /* strip the enable bit */
 423                 value = bcd2bin(byte);
 424         }
 425
 426         return value;
 427 }
 428
 429 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 430 {
 431         struct platform_device *pdev = to_platform_device(dev);
 432         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 433         struct rtc_time *tm = &wkalrm->time;
 434
 435         spin_lock_irq(&rtc->lock);
 436
 437         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 438         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 439         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 440         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 441         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 442         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 443         if (tm->tm_mon > 0)
 444                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 445         tm->tm_year     = 0xffff;
 446
 447         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 448
 449         spin_unlock_irq(&rtc->lock);
 450
 451         return 0;
 452 }
 453
 454 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 455                                             int value, int reg_off)
 456 {
 457         /* < 0 for a value that is ignored */
 458         if (value < 0)
 459                 writeb(0, rtc->regbase + reg_off);
 460         else
 461                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 462 }
 463
 464 static int sh_rtc_check_alarm(struct rtc_time *tm)
 465 {
 466         /*
 467          * The original rtc says anything > 0xc0 is "don't care" or "match
 468          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 469          * The original rtc doesn't support years - some things use -1 and
 470          * some 0xffff. We use -1 to make out tests easier.
 471          */
 472         if (tm->tm_year == 0xffff)
 473                 tm->tm_year = -1;
 474         if (tm->tm_mon >= 0xff)
 475                 tm->tm_mon = -1;
 476         if (tm->tm_mday >= 0xff)
 477                 tm->tm_mday = -1;
 478         if (tm->tm_wday >= 0xff)
 479                 tm->tm_wday = -1;
 480         if (tm->tm_hour >= 0xff)
 481                 tm->tm_hour = -1;
 482         if (tm->tm_min >= 0xff)
 483                 tm->tm_min = -1;
 484         if (tm->tm_sec >= 0xff)
 485                 tm->tm_sec = -1;
 486
 487         if (tm->tm_year > 9999 ||
 488                 tm->tm_mon >= 12 ||
 489                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 490                 tm->tm_wday >= 7 ||
 491                 tm->tm_hour >= 24 ||
 492                 tm->tm_min >= 60 ||
 493                 tm->tm_sec >= 60)
 494                 return -EINVAL;
 495
 496         return 0;
 497 }
 498
 499 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 500 {
 501         struct platform_device *pdev = to_platform_device(dev);
 502         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 503         unsigned int rcr1;
 504         struct rtc_time *tm = &wkalrm->time;
 505         int mon, err;
 506
 507         err = sh_rtc_check_alarm(tm);
 508         if (unlikely(err < 0))
 509                 return err;
 510
 511         spin_lock_irq(&rtc->lock);
 512
 513         /* disable alarm interrupt and clear the alarm flag */
 514         rcr1 = readb(rtc->regbase + RCR1);
 515         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 516         writeb(rcr1, rtc->regbase + RCR1);
 517
 518         /* set alarm time */
 519         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 520         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 521         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 522         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 523         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 524         mon = tm->tm_mon;
 525         if (mon >= 0)
 526                 mon += 1;
 527         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 528
 529         if (wkalrm->enabled) {
 530                 rcr1 |= RCR1_AIE;
 531                 writeb(rcr1, rtc->regbase + RCR1);
 532         }
 533
 534         spin_unlock_irq(&rtc->lock);
 535
 536         return 0;
 537 }
 538
 539 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 540 {
 541         struct platform_device *pdev = to_platform_device(dev);
 542         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 543
 544         if (enabled) {
 545                 rtc->periodic_freq |= PF_KOU;
 546                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 547         } else {
 548                 rtc->periodic_freq &= ~PF_KOU;
 549                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 550         }
 551 }
 552
 553 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 554 {
 555         if (!is_power_of_2(freq))
 556                 return -EINVAL;
 557         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 558 }
 559
 560 static struct rtc_class_ops sh_rtc_ops = {
 561         .ioctl          = sh_rtc_ioctl,
 562         .read_time      = sh_rtc_read_time,
 563         .set_time       = sh_rtc_set_time,
 564         .read_alarm     = sh_rtc_read_alarm,
 565         .set_alarm      = sh_rtc_set_alarm,
 566         .irq_set_state  = sh_rtc_irq_set_state,
 567         .irq_set_freq   = sh_rtc_irq_set_freq,
 568         .proc           = sh_rtc_proc,
 569 };
 570
 571 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 572 {
 573         struct sh_rtc *rtc;
 574         struct resource *res;
 575         unsigned int tmp;
 576         int ret;
 577
 578         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 579         if (unlikely(!rtc))
 580                 return -ENOMEM;
 581
 582         spin_lock_init(&rtc->lock);
 583
 584         /* get periodic/carry/alarm irqs */
 585         ret = platform_get_irq(pdev, 0);
 586         if (unlikely(ret <= 0)) {
 587                 ret = -ENOENT;
 588                 dev_err(&pdev->dev, "No IRQ for period\n");
 589                 goto err_badres;
 590         }
 591         rtc->periodic_irq = ret;
 592
 593         ret = platform_get_irq(pdev, 1);
 594         if (unlikely(ret <= 0)) {
 595                 ret = -ENOENT;
 596                 dev_err(&pdev->dev, "No IRQ for carry\n");
 597                 goto err_badres;
 598         }
 599         rtc->carry_irq = ret;
 600
 601         ret = platform_get_irq(pdev, 2);
 602         if (unlikely(ret <= 0)) {
 603                 ret = -ENOENT;
 604                 dev_err(&pdev->dev, "No IRQ for alarm\n");
 605                 goto err_badres;
 606         }
 607         rtc->alarm_irq = ret;
 608
 609         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 610         if (unlikely(res == NULL)) {
 611                 ret = -ENOENT;
 612                 dev_err(&pdev->dev, "No IO resource\n");
 613                 goto err_badres;
 614         }
 615
 616         rtc->regsize = res->end - res->start + 1;
 617
 618         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 619         if (unlikely(!rtc->res)) {
 620                 ret = -EBUSY;
 621                 goto err_badres;
 622         }
 623
 624         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 625         if (unlikely(!rtc->regbase)) {
 626                 ret = -EINVAL;
 627                 goto err_badmap;
 628         }
 629
 630         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 631                                            &sh_rtc_ops, THIS_MODULE);
 632         if (IS_ERR(rtc->rtc_dev)) {
 633                 ret = PTR_ERR(rtc->rtc_dev);
 634                 goto err_unmap;
 635         }
 636
 637         rtc->capabilities = RTC_DEF_CAPABILITIES;
 638         if (pdev->dev.platform_data) {
 639                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 640
 641                 /*
 642                  * Some CPUs have special capabilities in addition to the
 643                  * default set. Add those in here.
 644                  */
 645                 rtc->capabilities |= pinfo->capabilities;
 646         }
 647
 648         rtc->rtc_dev->max_user_freq = 256;
 649         rtc->rtc_dev->irq_freq = 1;
 650         rtc->periodic_freq = 0x60;
 651
 652         platform_set_drvdata(pdev, rtc);
 653
 654         /* register periodic/carry/alarm irqs */
 655         ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
 656                           "sh-rtc period", rtc);
 657         if (unlikely(ret)) {
 658                 dev_err(&pdev->dev,
 659                         "request period IRQ failed with %d, IRQ %d\n", ret,
 660                         rtc->periodic_irq);
 661                 goto err_unmap;
 662         }
 663
 664         ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
 665                           "sh-rtc carry", rtc);
 666         if (unlikely(ret)) {
 667                 dev_err(&pdev->dev,
 668                         "request carry IRQ failed with %d, IRQ %d\n", ret,
 669                         rtc->carry_irq);
 670                 free_irq(rtc->periodic_irq, rtc);
 671                 goto err_unmap;
 672         }
 673
 674         ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
 675                           "sh-rtc alarm", rtc);
 676         if (unlikely(ret)) {
 677                 dev_err(&pdev->dev,
 678                         "request alarm IRQ failed with %d, IRQ %d\n", ret,
 679                         rtc->alarm_irq);
 680                 free_irq(rtc->carry_irq, rtc);
 681                 free_irq(rtc->periodic_irq, rtc);
 682                 goto err_unmap;
 683         }
 684
 685         tmp = readb(rtc->regbase + RCR1);
 686         tmp &= ~RCR1_CF;
 687         tmp |= RCR1_CIE;
 688         writeb(tmp, rtc->regbase + RCR1);
 689
 690         return 0;
 691
 692 err_unmap:
 693         iounmap(rtc->regbase);
 694 err_badmap:
 695         release_resource(rtc->res);
 696 err_badres:
 697         kfree(rtc);
 698
 699         return ret;
 700 }
 701
 702 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 703 {
 704         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 705
 706         if (likely(rtc->rtc_dev))
 707                 rtc_device_unregister(rtc->rtc_dev);
 708
 709         sh_rtc_setpie(&pdev->dev, 0);
 710         sh_rtc_setaie(&pdev->dev, 0);
 711
 712         free_irq(rtc->carry_irq, rtc);
 713         free_irq(rtc->periodic_irq, rtc);
 714         free_irq(rtc->alarm_irq, rtc);
 715
 716         release_resource(rtc->res);
 717
 718         iounmap(rtc->regbase);
 719
 720         platform_set_drvdata(pdev, NULL);
 721
 722         kfree(rtc);
 723
 724         return 0;
 725 }
 726 static struct platform_driver sh_rtc_platform_driver = {
 727         .driver         = {
 728                 .name   = DRV_NAME,
 729                 .owner  = THIS_MODULE,
 730         },
 731         .probe          = sh_rtc_probe,
 732         .remove         = __devexit_p(sh_rtc_remove),
 733 };
 734
 735 static int __init sh_rtc_init(void)
 736 {
 737         return platform_driver_register(&sh_rtc_platform_driver);
 738 }
 739
 740 static void __exit sh_rtc_exit(void)
 741 {
 742         platform_driver_unregister(&sh_rtc_platform_driver);
 743 }
 744
 745 module_init(sh_rtc_init);
 746 module_exit(sh_rtc_exit);
 747
 748 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 749 MODULE_VERSION(DRV_VERSION);
 750 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 751               "Jamie Lenehan <lenehan@twibble.org>, "
 752               "Angelo Castello <angelo.castello@st.com>");
 753 MODULE_LICENSE("GPL");
 754 MODULE_ALIAS("platform:" DRV_NAME);