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     "0.2.1"
  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 int __sh_rtc_interrupt(struct sh_rtc *rtc)
 103 {
 104         unsigned int tmp, pending;
 105
 106         tmp = readb(rtc->regbase + RCR1);
 107         pending = tmp & RCR1_CF;
 108         tmp &= ~RCR1_CF;
 109         writeb(tmp, rtc->regbase + RCR1);
 110
 111         /* Users have requested One x Second IRQ */
 112         if (pending && rtc->periodic_freq & PF_OXS)
 113                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 114
 115         return pending;
 116 }
 117
 118 static int __sh_rtc_alarm(struct sh_rtc *rtc)
 119 {
 120         unsigned int tmp, pending;
 121
 122         tmp = readb(rtc->regbase + RCR1);
 123         pending = tmp & RCR1_AF;
 124         tmp &= ~(RCR1_AF | RCR1_AIE);
 125         writeb(tmp, rtc->regbase + RCR1);
 126
 127         if (pending)
 128                 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 129
 130         return pending;
 131 }
 132
 133 static int __sh_rtc_periodic(struct sh_rtc *rtc)
 134 {
 135         struct rtc_device *rtc_dev = rtc->rtc_dev;
 136         struct rtc_task *irq_task;
 137         unsigned int tmp, pending;
 138
 139         tmp = readb(rtc->regbase + RCR2);
 140         pending = tmp & RCR2_PEF;
 141         tmp &= ~RCR2_PEF;
 142         writeb(tmp, rtc->regbase + RCR2);
 143
 144         if (!pending)
 145                 return 0;
 146
 147         /* Half period enabled than one skipped and the next notified */
 148         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
 149                 rtc->periodic_freq &= ~PF_COUNT;
 150         else {
 151                 if (rtc->periodic_freq & PF_HP)
 152                         rtc->periodic_freq |= PF_COUNT;
 153                 if (rtc->periodic_freq & PF_KOU) {
 154                         spin_lock(&rtc_dev->irq_task_lock);
 155                         irq_task = rtc_dev->irq_task;
 156                         if (irq_task)
 157                                 irq_task->func(irq_task->private_data);
 158                         spin_unlock(&rtc_dev->irq_task_lock);
 159                 } else
 160                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 161         }
 162
 163         return pending;
 164 }
 165
 166 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 167 {
 168         struct sh_rtc *rtc = dev_id;
 169         int ret;
 170
 171         spin_lock(&rtc->lock);
 172         ret = __sh_rtc_interrupt(rtc);
 173         spin_unlock(&rtc->lock);
 174
 175         return IRQ_RETVAL(ret);
 176 }
 177
 178 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 179 {
 180         struct sh_rtc *rtc = dev_id;
 181         int ret;
 182
 183         spin_lock(&rtc->lock);
 184         ret = __sh_rtc_alarm(rtc);
 185         spin_unlock(&rtc->lock);
 186
 187         return IRQ_RETVAL(ret);
 188 }
 189
 190 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 191 {
 192         struct sh_rtc *rtc = dev_id;
 193         int ret;
 194
 195         spin_lock(&rtc->lock);
 196         ret = __sh_rtc_periodic(rtc);
 197         spin_unlock(&rtc->lock);
 198
 199         return IRQ_RETVAL(ret);
 200 }
 201
 202 static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
 203 {
 204         struct sh_rtc *rtc = dev_id;
 205         int ret;
 206
 207         spin_lock(&rtc->lock);
 208         ret = __sh_rtc_interrupt(rtc);
 209         ret |= __sh_rtc_alarm(rtc);
 210         ret |= __sh_rtc_periodic(rtc);
 211         spin_unlock(&rtc->lock);
 212
 213         return IRQ_RETVAL(ret);
 214 }
 215
 216 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
 217 {
 218         struct sh_rtc *rtc = dev_get_drvdata(dev);
 219         unsigned int tmp;
 220
 221         spin_lock_irq(&rtc->lock);
 222
 223         tmp = readb(rtc->regbase + RCR2);
 224
 225         if (enable) {
 226                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
 227                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 228         } else
 229                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 230
 231         writeb(tmp, rtc->regbase + RCR2);
 232
 233         spin_unlock_irq(&rtc->lock);
 234 }
 235
 236 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
 237 {
 238         struct sh_rtc *rtc = dev_get_drvdata(dev);
 239         int tmp, ret = 0;
 240
 241         spin_lock_irq(&rtc->lock);
 242         tmp = rtc->periodic_freq & PF_MASK;
 243
 244         switch (freq) {
 245         case 0:
 246                 rtc->periodic_freq = 0x00;
 247                 break;
 248         case 1:
 249                 rtc->periodic_freq = 0x60;
 250                 break;
 251         case 2:
 252                 rtc->periodic_freq = 0x50;
 253                 break;
 254         case 4:
 255                 rtc->periodic_freq = 0x40;
 256                 break;
 257         case 8:
 258                 rtc->periodic_freq = 0x30 | PF_HP;
 259                 break;
 260         case 16:
 261                 rtc->periodic_freq = 0x30;
 262                 break;
 263         case 32:
 264                 rtc->periodic_freq = 0x20 | PF_HP;
 265                 break;
 266         case 64:
 267                 rtc->periodic_freq = 0x20;
 268                 break;
 269         case 128:
 270                 rtc->periodic_freq = 0x10 | PF_HP;
 271                 break;
 272         case 256:
 273                 rtc->periodic_freq = 0x10;
 274                 break;
 275         default:
 276                 ret = -ENOTSUPP;
 277         }
 278
 279         if (ret == 0) {
 280                 rtc->periodic_freq |= tmp;
 281                 rtc->rtc_dev->irq_freq = freq;
 282         }
 283
 284         spin_unlock_irq(&rtc->lock);
 285         return ret;
 286 }
 287
 288 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 289 {
 290         struct sh_rtc *rtc = dev_get_drvdata(dev);
 291         unsigned int tmp;
 292
 293         spin_lock_irq(&rtc->lock);
 294
 295         tmp = readb(rtc->regbase + RCR1);
 296
 297         if (!enable)
 298                 tmp &= ~RCR1_AIE;
 299         else
 300                 tmp |= RCR1_AIE;
 301
 302         writeb(tmp, rtc->regbase + RCR1);
 303
 304         spin_unlock_irq(&rtc->lock);
 305 }
 306
 307 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 308 {
 309         struct sh_rtc *rtc = dev_get_drvdata(dev);
 310         unsigned int tmp;
 311
 312         tmp = readb(rtc->regbase + RCR1);
 313         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 314
 315         tmp = readb(rtc->regbase + RCR2);
 316         seq_printf(seq, "periodic_IRQ\t: %s\n",
 317                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 318
 319         return 0;
 320 }
 321
 322 static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
 323 {
 324         struct sh_rtc *rtc = dev_get_drvdata(dev);
 325         unsigned int tmp;
 326
 327         spin_lock_irq(&rtc->lock);
 328
 329         tmp = readb(rtc->regbase + RCR1);
 330
 331         if (!enable)
 332                 tmp &= ~RCR1_CIE;
 333         else
 334                 tmp |= RCR1_CIE;
 335
 336         writeb(tmp, rtc->regbase + RCR1);
 337
 338         spin_unlock_irq(&rtc->lock);
 339 }
 340
 341 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 342 {
 343         struct sh_rtc *rtc = dev_get_drvdata(dev);
 344         unsigned int ret = 0;
 345
 346         switch (cmd) {
 347         case RTC_PIE_OFF:
 348         case RTC_PIE_ON:
 349                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 350                 break;
 351         case RTC_AIE_OFF:
 352         case RTC_AIE_ON:
 353                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 354                 break;
 355         case RTC_UIE_OFF:
 356                 rtc->periodic_freq &= ~PF_OXS;
 357                 sh_rtc_setcie(dev, 0);
 358                 break;
 359         case RTC_UIE_ON:
 360                 rtc->periodic_freq |= PF_OXS;
 361                 sh_rtc_setcie(dev, 1);
 362                 break;
 363         case RTC_IRQP_READ:
 364                 ret = put_user(rtc->rtc_dev->irq_freq,
 365                                (unsigned long __user *)arg);
 366                 break;
 367         case RTC_IRQP_SET:
 368                 ret = sh_rtc_setfreq(dev, arg);
 369                 break;
 370         default:
 371                 ret = -ENOIOCTLCMD;
 372         }
 373
 374         return ret;
 375 }
 376
 377 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 378 {
 379         struct platform_device *pdev = to_platform_device(dev);
 380         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 381         unsigned int sec128, sec2, yr, yr100, cf_bit;
 382
 383         do {
 384                 unsigned int tmp;
 385
 386                 spin_lock_irq(&rtc->lock);
 387
 388                 tmp = readb(rtc->regbase + RCR1);
 389                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 390                 tmp |= RCR1_CIE;
 391                 writeb(tmp, rtc->regbase + RCR1);
 392
 393                 sec128 = readb(rtc->regbase + R64CNT);
 394
 395                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 396                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 397                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 398                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 399                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 400                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 401
 402                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 403                         yr  = readw(rtc->regbase + RYRCNT);
 404                         yr100 = bcd2bin(yr >> 8);
 405                         yr &= 0xff;
 406                 } else {
 407                         yr  = readb(rtc->regbase + RYRCNT);
 408                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 409                 }
 410
 411                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 412
 413                 sec2 = readb(rtc->regbase + R64CNT);
 414                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 415
 416                 spin_unlock_irq(&rtc->lock);
 417         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 418
 419 #if RTC_BIT_INVERTED != 0
 420         if ((sec128 & RTC_BIT_INVERTED))
 421                 tm->tm_sec--;
 422 #endif
 423
 424         /* only keep the carry interrupt enabled if UIE is on */
 425         if (!(rtc->periodic_freq & PF_OXS))
 426                 sh_rtc_setcie(dev, 0);
 427
 428         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 429                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 430                 __func__,
 431                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 432                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 433
 434         if (rtc_valid_tm(tm) < 0) {
 435                 dev_err(dev, "invalid date\n");
 436                 rtc_time_to_tm(0, tm);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 443 {
 444         struct platform_device *pdev = to_platform_device(dev);
 445         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 446         unsigned int tmp;
 447         int year;
 448
 449         spin_lock_irq(&rtc->lock);
 450
 451         /* Reset pre-scaler & stop RTC */
 452         tmp = readb(rtc->regbase + RCR2);
 453         tmp |= RCR2_RESET;
 454         tmp &= ~RCR2_START;
 455         writeb(tmp, rtc->regbase + RCR2);
 456
 457         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 458         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 459         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 460         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 461         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 462         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 463
 464         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 465                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 466                         bin2bcd(tm->tm_year % 100);
 467                 writew(year, rtc->regbase + RYRCNT);
 468         } else {
 469                 year = tm->tm_year % 100;
 470                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 471         }
 472
 473         /* Start RTC */
 474         tmp = readb(rtc->regbase + RCR2);
 475         tmp &= ~RCR2_RESET;
 476         tmp |= RCR2_RTCEN | RCR2_START;
 477         writeb(tmp, rtc->regbase + RCR2);
 478
 479         spin_unlock_irq(&rtc->lock);
 480
 481         return 0;
 482 }
 483
 484 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 485 {
 486         unsigned int byte;
 487         int value = 0xff;       /* return 0xff for ignored values */
 488
 489         byte = readb(rtc->regbase + reg_off);
 490         if (byte & AR_ENB) {
 491                 byte &= ~AR_ENB;        /* strip the enable bit */
 492                 value = bcd2bin(byte);
 493         }
 494
 495         return value;
 496 }
 497
 498 static int sh_rtc_read_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         struct rtc_time *tm = &wkalrm->time;
 503
 504         spin_lock_irq(&rtc->lock);
 505
 506         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 507         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 508         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 509         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 510         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 511         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 512         if (tm->tm_mon > 0)
 513                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 514         tm->tm_year     = 0xffff;
 515
 516         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 517
 518         spin_unlock_irq(&rtc->lock);
 519
 520         return 0;
 521 }
 522
 523 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 524                                             int value, int reg_off)
 525 {
 526         /* < 0 for a value that is ignored */
 527         if (value < 0)
 528                 writeb(0, rtc->regbase + reg_off);
 529         else
 530                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 531 }
 532
 533 static int sh_rtc_check_alarm(struct rtc_time *tm)
 534 {
 535         /*
 536          * The original rtc says anything > 0xc0 is "don't care" or "match
 537          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 538          * The original rtc doesn't support years - some things use -1 and
 539          * some 0xffff. We use -1 to make out tests easier.
 540          */
 541         if (tm->tm_year == 0xffff)
 542                 tm->tm_year = -1;
 543         if (tm->tm_mon >= 0xff)
 544                 tm->tm_mon = -1;
 545         if (tm->tm_mday >= 0xff)
 546                 tm->tm_mday = -1;
 547         if (tm->tm_wday >= 0xff)
 548                 tm->tm_wday = -1;
 549         if (tm->tm_hour >= 0xff)
 550                 tm->tm_hour = -1;
 551         if (tm->tm_min >= 0xff)
 552                 tm->tm_min = -1;
 553         if (tm->tm_sec >= 0xff)
 554                 tm->tm_sec = -1;
 555
 556         if (tm->tm_year > 9999 ||
 557                 tm->tm_mon >= 12 ||
 558                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 559                 tm->tm_wday >= 7 ||
 560                 tm->tm_hour >= 24 ||
 561                 tm->tm_min >= 60 ||
 562                 tm->tm_sec >= 60)
 563                 return -EINVAL;
 564
 565         return 0;
 566 }
 567
 568 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 569 {
 570         struct platform_device *pdev = to_platform_device(dev);
 571         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 572         unsigned int rcr1;
 573         struct rtc_time *tm = &wkalrm->time;
 574         int mon, err;
 575
 576         err = sh_rtc_check_alarm(tm);
 577         if (unlikely(err < 0))
 578                 return err;
 579
 580         spin_lock_irq(&rtc->lock);
 581
 582         /* disable alarm interrupt and clear the alarm flag */
 583         rcr1 = readb(rtc->regbase + RCR1);
 584         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 585         writeb(rcr1, rtc->regbase + RCR1);
 586
 587         /* set alarm time */
 588         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 589         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 590         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 591         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 592         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 593         mon = tm->tm_mon;
 594         if (mon >= 0)
 595                 mon += 1;
 596         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 597
 598         if (wkalrm->enabled) {
 599                 rcr1 |= RCR1_AIE;
 600                 writeb(rcr1, rtc->regbase + RCR1);
 601         }
 602
 603         spin_unlock_irq(&rtc->lock);
 604
 605         return 0;
 606 }
 607
 608 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 609 {
 610         struct platform_device *pdev = to_platform_device(dev);
 611         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 612
 613         if (enabled) {
 614                 rtc->periodic_freq |= PF_KOU;
 615                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 616         } else {
 617                 rtc->periodic_freq &= ~PF_KOU;
 618                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 619         }
 620 }
 621
 622 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 623 {
 624         if (!is_power_of_2(freq))
 625                 return -EINVAL;
 626         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 627 }
 628
 629 static struct rtc_class_ops sh_rtc_ops = {
 630         .ioctl          = sh_rtc_ioctl,
 631         .read_time      = sh_rtc_read_time,
 632         .set_time       = sh_rtc_set_time,
 633         .read_alarm     = sh_rtc_read_alarm,
 634         .set_alarm      = sh_rtc_set_alarm,
 635         .irq_set_state  = sh_rtc_irq_set_state,
 636         .irq_set_freq   = sh_rtc_irq_set_freq,
 637         .proc           = sh_rtc_proc,
 638 };
 639
 640 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 641 {
 642         struct sh_rtc *rtc;
 643         struct resource *res;
 644         int ret;
 645
 646         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 647         if (unlikely(!rtc))
 648                 return -ENOMEM;
 649
 650         spin_lock_init(&rtc->lock);
 651
 652         /* get periodic/carry/alarm irqs */
 653         ret = platform_get_irq(pdev, 0);
 654         if (unlikely(ret <= 0)) {
 655                 ret = -ENOENT;
 656                 dev_err(&pdev->dev, "No IRQ resource\n");
 657                 goto err_badres;
 658         }
 659         rtc->periodic_irq = ret;
 660         rtc->carry_irq = platform_get_irq(pdev, 1);
 661         rtc->alarm_irq = platform_get_irq(pdev, 2);
 662
 663         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 664         if (unlikely(res == NULL)) {
 665                 ret = -ENOENT;
 666                 dev_err(&pdev->dev, "No IO resource\n");
 667                 goto err_badres;
 668         }
 669
 670         rtc->regsize = res->end - res->start + 1;
 671
 672         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 673         if (unlikely(!rtc->res)) {
 674                 ret = -EBUSY;
 675                 goto err_badres;
 676         }
 677
 678         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 679         if (unlikely(!rtc->regbase)) {
 680                 ret = -EINVAL;
 681                 goto err_badmap;
 682         }
 683
 684         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 685                                            &sh_rtc_ops, THIS_MODULE);
 686         if (IS_ERR(rtc->rtc_dev)) {
 687                 ret = PTR_ERR(rtc->rtc_dev);
 688                 goto err_unmap;
 689         }
 690
 691         rtc->capabilities = RTC_DEF_CAPABILITIES;
 692         if (pdev->dev.platform_data) {
 693                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 694
 695                 /*
 696                  * Some CPUs have special capabilities in addition to the
 697                  * default set. Add those in here.
 698                  */
 699                 rtc->capabilities |= pinfo->capabilities;
 700         }
 701
 702         rtc->rtc_dev->max_user_freq = 256;
 703
 704         platform_set_drvdata(pdev, rtc);
 705
 706         if (rtc->carry_irq <= 0) {
 707                 /* register shared periodic/carry/alarm irq */
 708                 ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
 709                                   IRQF_DISABLED, "sh-rtc", rtc);
 710                 if (unlikely(ret)) {
 711                         dev_err(&pdev->dev,
 712                                 "request IRQ failed with %d, IRQ %d\n", ret,
 713                                 rtc->periodic_irq);
 714                         goto err_unmap;
 715                 }
 716         } else {
 717                 /* register periodic/carry/alarm irqs */
 718                 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
 719                                   IRQF_DISABLED, "sh-rtc period", rtc);
 720                 if (unlikely(ret)) {
 721                         dev_err(&pdev->dev,
 722                                 "request period IRQ failed with %d, IRQ %d\n",
 723                                 ret, rtc->periodic_irq);
 724                         goto err_unmap;
 725                 }
 726
 727                 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
 728                                   IRQF_DISABLED, "sh-rtc carry", rtc);
 729                 if (unlikely(ret)) {
 730                         dev_err(&pdev->dev,
 731                                 "request carry IRQ failed with %d, IRQ %d\n",
 732                                 ret, rtc->carry_irq);
 733                         free_irq(rtc->periodic_irq, rtc);
 734                         goto err_unmap;
 735                 }
 736
 737                 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
 738                                   IRQF_DISABLED, "sh-rtc alarm", rtc);
 739                 if (unlikely(ret)) {
 740                         dev_err(&pdev->dev,
 741                                 "request alarm IRQ failed with %d, IRQ %d\n",
 742                                 ret, rtc->alarm_irq);
 743                         free_irq(rtc->carry_irq, rtc);
 744                         free_irq(rtc->periodic_irq, rtc);
 745                         goto err_unmap;
 746                 }
 747         }
 748
 749         /* everything disabled by default */
 750         rtc->periodic_freq = 0;
 751         rtc->rtc_dev->irq_freq = 0;
 752         sh_rtc_setpie(&pdev->dev, 0);
 753         sh_rtc_setaie(&pdev->dev, 0);
 754         sh_rtc_setcie(&pdev->dev, 0);
 755         return 0;
 756
 757 err_unmap:
 758         iounmap(rtc->regbase);
 759 err_badmap:
 760         release_resource(rtc->res);
 761 err_badres:
 762         kfree(rtc);
 763
 764         return ret;
 765 }
 766
 767 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 768 {
 769         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 770
 771         if (likely(rtc->rtc_dev))
 772                 rtc_device_unregister(rtc->rtc_dev);
 773
 774         sh_rtc_setpie(&pdev->dev, 0);
 775         sh_rtc_setaie(&pdev->dev, 0);
 776         sh_rtc_setcie(&pdev->dev, 0);
 777
 778         free_irq(rtc->periodic_irq, rtc);
 779         if (rtc->carry_irq > 0) {
 780                 free_irq(rtc->carry_irq, rtc);
 781                 free_irq(rtc->alarm_irq, rtc);
 782         }
 783
 784         release_resource(rtc->res);
 785
 786         iounmap(rtc->regbase);
 787
 788         platform_set_drvdata(pdev, NULL);
 789
 790         kfree(rtc);
 791
 792         return 0;
 793 }
 794 static struct platform_driver sh_rtc_platform_driver = {
 795         .driver         = {
 796                 .name   = DRV_NAME,
 797                 .owner  = THIS_MODULE,
 798         },
 799         .probe          = sh_rtc_probe,
 800         .remove         = __devexit_p(sh_rtc_remove),
 801 };
 802
 803 static int __init sh_rtc_init(void)
 804 {
 805         return platform_driver_register(&sh_rtc_platform_driver);
 806 }
 807
 808 static void __exit sh_rtc_exit(void)
 809 {
 810         platform_driver_unregister(&sh_rtc_platform_driver);
 811 }
 812
 813 module_init(sh_rtc_init);
 814 module_exit(sh_rtc_exit);
 815
 816 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 817 MODULE_VERSION(DRV_VERSION);
 818 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 819               "Jamie Lenehan <lenehan@twibble.org>, "
 820               "Angelo Castello <angelo.castello@st.com>");
 821 MODULE_LICENSE("GPL");
 822 MODULE_ALIAS("platform:" DRV_NAME);