SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/rtc/rtc-sh.c

   1 /*
   2  * SuperH On-Chip RTC Support
   3  *
   4  * Copyright (C) 2006 - 2009  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 <linux/clk.h>
  29 #include <asm/rtc.h>
  30
  31 #define DRV_NAME        "sh-rtc"
  32 #define DRV_VERSION     "0.2.3"
  33
  34 #define RTC_REG(r)      ((r) * rtc_reg_size)
  35
  36 #define R64CNT          RTC_REG(0)
  37
  38 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  39 #define RMINCNT         RTC_REG(2)      /* RTC min */
  40 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  41 #define RWKCNT          RTC_REG(4)      /* RTC week */
  42 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  43 #define RMONCNT         RTC_REG(6)      /* RTC month */
  44 #define RYRCNT          RTC_REG(7)      /* RTC year */
  45 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  46 #define RMINAR          RTC_REG(9)      /* ALARM min */
  47 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  48 #define RWKAR           RTC_REG(11)     /* ALARM week */
  49 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  50 #define RMONAR          RTC_REG(13)     /* ALARM month */
  51 #define RCR1            RTC_REG(14)     /* Control */
  52 #define RCR2            RTC_REG(15)     /* Control */
  53
  54 /*
  55  * Note on RYRAR and RCR3: Up until this point most of the register
  56  * definitions are consistent across all of the available parts. However,
  57  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  58  * register used to control RYRCNT/RYRAR compare) varies considerably
  59  * across various parts, occasionally being mapped in to a completely
  60  * unrelated address space. For proper RYRAR support a separate resource
  61  * would have to be handed off, but as this is purely optional in
  62  * practice, we simply opt not to support it, thereby keeping the code
  63  * quite a bit more simplified.
  64  */
  65
  66 /* ALARM Bits - or with BCD encoded value */
  67 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  68
  69 /* Period Bits */
  70 #define PF_HP           0x100   /* Enable Half Period to support 8,32,128Hz */
  71 #define PF_COUNT        0x200   /* Half periodic counter */
  72 #define PF_OXS          0x400   /* Periodic One x Second */
  73 #define PF_KOU          0x800   /* Kernel or User periodic request 1=kernel */
  74 #define PF_MASK         0xf00
  75
  76 /* RCR1 Bits */
  77 #define RCR1_CF         0x80    /* Carry Flag             */
  78 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  79 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  80 #define RCR1_AF         0x01    /* Alarm Flag             */
  81
  82 /* RCR2 Bits */
  83 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  84 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  85 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  86 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  87 #define RCR2_RESET      0x02    /* Reset bit               */
  88 #define RCR2_START      0x01    /* Start bit               */
  89
  90 struct sh_rtc {
  91         void __iomem            *regbase;
  92         unsigned long           regsize;
  93         struct resource         *res;
  94         int                     alarm_irq;
  95         int                     periodic_irq;
  96         int                     carry_irq;
  97         struct clk              *clk;
  98         struct rtc_device       *rtc_dev;
  99         spinlock_t              lock;
 100         unsigned long           capabilities;   /* See asm/rtc.h for cap bits */
 101         unsigned short          periodic_freq;
 102 };
 103
 104 static int __sh_rtc_interrupt(struct sh_rtc *rtc)
 105 {
 106         unsigned int tmp, pending;
 107
 108         tmp = readb(rtc->regbase + RCR1);
 109         pending = tmp & RCR1_CF;
 110         tmp &= ~RCR1_CF;
 111         writeb(tmp, rtc->regbase + RCR1);
 112
 113         /* Users have requested One x Second IRQ */
 114         if (pending && rtc->periodic_freq & PF_OXS)
 115                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 116
 117         return pending;
 118 }
 119
 120 static int __sh_rtc_alarm(struct sh_rtc *rtc)
 121 {
 122         unsigned int tmp, pending;
 123
 124         tmp = readb(rtc->regbase + RCR1);
 125         pending = tmp & RCR1_AF;
 126         tmp &= ~(RCR1_AF | RCR1_AIE);
 127         writeb(tmp, rtc->regbase + RCR1);
 128
 129         if (pending)
 130                 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 131
 132         return pending;
 133 }
 134
 135 static int __sh_rtc_periodic(struct sh_rtc *rtc)
 136 {
 137         struct rtc_device *rtc_dev = rtc->rtc_dev;
 138         struct rtc_task *irq_task;
 139         unsigned int tmp, pending;
 140
 141         tmp = readb(rtc->regbase + RCR2);
 142         pending = tmp & RCR2_PEF;
 143         tmp &= ~RCR2_PEF;
 144         writeb(tmp, rtc->regbase + RCR2);
 145
 146         if (!pending)
 147                 return 0;
 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                         irq_task = rtc_dev->irq_task;
 158                         if (irq_task)
 159                                 irq_task->func(irq_task->private_data);
 160                         spin_unlock(&rtc_dev->irq_task_lock);
 161                 } else
 162                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 163         }
 164
 165         return pending;
 166 }
 167
 168 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 169 {
 170         struct sh_rtc *rtc = dev_id;
 171         int ret;
 172
 173         spin_lock(&rtc->lock);
 174         ret = __sh_rtc_interrupt(rtc);
 175         spin_unlock(&rtc->lock);
 176
 177         return IRQ_RETVAL(ret);
 178 }
 179
 180 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 181 {
 182         struct sh_rtc *rtc = dev_id;
 183         int ret;
 184
 185         spin_lock(&rtc->lock);
 186         ret = __sh_rtc_alarm(rtc);
 187         spin_unlock(&rtc->lock);
 188
 189         return IRQ_RETVAL(ret);
 190 }
 191
 192 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 193 {
 194         struct sh_rtc *rtc = dev_id;
 195         int ret;
 196
 197         spin_lock(&rtc->lock);
 198         ret = __sh_rtc_periodic(rtc);
 199         spin_unlock(&rtc->lock);
 200
 201         return IRQ_RETVAL(ret);
 202 }
 203
 204 static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
 205 {
 206         struct sh_rtc *rtc = dev_id;
 207         int ret;
 208
 209         spin_lock(&rtc->lock);
 210         ret = __sh_rtc_interrupt(rtc);
 211         ret |= __sh_rtc_alarm(rtc);
 212         ret |= __sh_rtc_periodic(rtc);
 213         spin_unlock(&rtc->lock);
 214
 215         return IRQ_RETVAL(ret);
 216 }
 217
 218 static int sh_rtc_irq_set_state(struct device *dev, int enable)
 219 {
 220         struct sh_rtc *rtc = dev_get_drvdata(dev);
 221         unsigned int tmp;
 222
 223         spin_lock_irq(&rtc->lock);
 224
 225         tmp = readb(rtc->regbase + RCR2);
 226
 227         if (enable) {
 228                 rtc->periodic_freq |= PF_KOU;
 229                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
 230                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 231         } else {
 232                 rtc->periodic_freq &= ~PF_KOU;
 233                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 234         }
 235
 236         writeb(tmp, rtc->regbase + RCR2);
 237
 238         spin_unlock_irq(&rtc->lock);
 239
 240         return 0;
 241 }
 242
 243 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 244 {
 245         struct sh_rtc *rtc = dev_get_drvdata(dev);
 246         int tmp, ret = 0;
 247
 248         spin_lock_irq(&rtc->lock);
 249         tmp = rtc->periodic_freq & PF_MASK;
 250
 251         switch (freq) {
 252         case 0:
 253                 rtc->periodic_freq = 0x00;
 254                 break;
 255         case 1:
 256                 rtc->periodic_freq = 0x60;
 257                 break;
 258         case 2:
 259                 rtc->periodic_freq = 0x50;
 260                 break;
 261         case 4:
 262                 rtc->periodic_freq = 0x40;
 263                 break;
 264         case 8:
 265                 rtc->periodic_freq = 0x30 | PF_HP;
 266                 break;
 267         case 16:
 268                 rtc->periodic_freq = 0x30;
 269                 break;
 270         case 32:
 271                 rtc->periodic_freq = 0x20 | PF_HP;
 272                 break;
 273         case 64:
 274                 rtc->periodic_freq = 0x20;
 275                 break;
 276         case 128:
 277                 rtc->periodic_freq = 0x10 | PF_HP;
 278                 break;
 279         case 256:
 280                 rtc->periodic_freq = 0x10;
 281                 break;
 282         default:
 283                 ret = -ENOTSUPP;
 284         }
 285
 286         if (ret == 0) {
 287                 rtc->periodic_freq |= tmp;
 288                 rtc->rtc_dev->irq_freq = freq;
 289         }
 290
 291         spin_unlock_irq(&rtc->lock);
 292         return ret;
 293 }
 294
 295 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 296 {
 297         struct sh_rtc *rtc = dev_get_drvdata(dev);
 298         unsigned int tmp;
 299
 300         spin_lock_irq(&rtc->lock);
 301
 302         tmp = readb(rtc->regbase + RCR1);
 303
 304         if (enable)
 305                 tmp |= RCR1_AIE;
 306         else
 307                 tmp &= ~RCR1_AIE;
 308
 309         writeb(tmp, rtc->regbase + RCR1);
 310
 311         spin_unlock_irq(&rtc->lock);
 312 }
 313
 314 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 315 {
 316         struct sh_rtc *rtc = dev_get_drvdata(dev);
 317         unsigned int tmp;
 318
 319         tmp = readb(rtc->regbase + RCR1);
 320         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 321
 322         tmp = readb(rtc->regbase + RCR2);
 323         seq_printf(seq, "periodic_IRQ\t: %s\n",
 324                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 325
 326         return 0;
 327 }
 328
 329 static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
 330 {
 331         struct sh_rtc *rtc = dev_get_drvdata(dev);
 332         unsigned int tmp;
 333
 334         spin_lock_irq(&rtc->lock);
 335
 336         tmp = readb(rtc->regbase + RCR1);
 337
 338         if (!enable)
 339                 tmp &= ~RCR1_CIE;
 340         else
 341                 tmp |= RCR1_CIE;
 342
 343         writeb(tmp, rtc->regbase + RCR1);
 344
 345         spin_unlock_irq(&rtc->lock);
 346 }
 347
 348 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 349 {
 350         struct sh_rtc *rtc = dev_get_drvdata(dev);
 351         unsigned int ret = 0;
 352
 353         switch (cmd) {
 354         case RTC_AIE_OFF:
 355         case RTC_AIE_ON:
 356                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 357                 break;
 358         case RTC_UIE_OFF:
 359                 rtc->periodic_freq &= ~PF_OXS;
 360                 sh_rtc_setcie(dev, 0);
 361                 break;
 362         case RTC_UIE_ON:
 363                 rtc->periodic_freq |= PF_OXS;
 364                 sh_rtc_setcie(dev, 1);
 365                 break;
 366         default:
 367                 ret = -ENOIOCTLCMD;
 368         }
 369
 370         return ret;
 371 }
 372
 373 static int sh_rtc_read_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 sec128, sec2, yr, yr100, cf_bit;
 378
 379         do {
 380                 unsigned int tmp;
 381
 382                 spin_lock_irq(&rtc->lock);
 383
 384                 tmp = readb(rtc->regbase + RCR1);
 385                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 386                 tmp |= RCR1_CIE;
 387                 writeb(tmp, rtc->regbase + RCR1);
 388
 389                 sec128 = readb(rtc->regbase + R64CNT);
 390
 391                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 392                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 393                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 394                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 395                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 396                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 397
 398                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 399                         yr  = readw(rtc->regbase + RYRCNT);
 400                         yr100 = bcd2bin(yr >> 8);
 401                         yr &= 0xff;
 402                 } else {
 403                         yr  = readb(rtc->regbase + RYRCNT);
 404                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 405                 }
 406
 407                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 408
 409                 sec2 = readb(rtc->regbase + R64CNT);
 410                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 411
 412                 spin_unlock_irq(&rtc->lock);
 413         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 414
 415 #if RTC_BIT_INVERTED != 0
 416         if ((sec128 & RTC_BIT_INVERTED))
 417                 tm->tm_sec--;
 418 #endif
 419
 420         /* only keep the carry interrupt enabled if UIE is on */
 421         if (!(rtc->periodic_freq & PF_OXS))
 422                 sh_rtc_setcie(dev, 0);
 423
 424         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 425                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 426                 __func__,
 427                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 428                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 429
 430         return rtc_valid_tm(tm);
 431 }
 432
 433 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 434 {
 435         struct platform_device *pdev = to_platform_device(dev);
 436         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 437         unsigned int tmp;
 438         int year;
 439
 440         spin_lock_irq(&rtc->lock);
 441
 442         /* Reset pre-scaler & stop RTC */
 443         tmp = readb(rtc->regbase + RCR2);
 444         tmp |= RCR2_RESET;
 445         tmp &= ~RCR2_START;
 446         writeb(tmp, rtc->regbase + RCR2);
 447
 448         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 449         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 450         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 451         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 452         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 453         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 454
 455         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 456                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 457                         bin2bcd(tm->tm_year % 100);
 458                 writew(year, rtc->regbase + RYRCNT);
 459         } else {
 460                 year = tm->tm_year % 100;
 461                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 462         }
 463
 464         /* Start RTC */
 465         tmp = readb(rtc->regbase + RCR2);
 466         tmp &= ~RCR2_RESET;
 467         tmp |= RCR2_RTCEN | RCR2_START;
 468         writeb(tmp, rtc->regbase + RCR2);
 469
 470         spin_unlock_irq(&rtc->lock);
 471
 472         return 0;
 473 }
 474
 475 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 476 {
 477         unsigned int byte;
 478         int value = 0xff;       /* return 0xff for ignored values */
 479
 480         byte = readb(rtc->regbase + reg_off);
 481         if (byte & AR_ENB) {
 482                 byte &= ~AR_ENB;        /* strip the enable bit */
 483                 value = bcd2bin(byte);
 484         }
 485
 486         return value;
 487 }
 488
 489 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 490 {
 491         struct platform_device *pdev = to_platform_device(dev);
 492         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 493         struct rtc_time *tm = &wkalrm->time;
 494
 495         spin_lock_irq(&rtc->lock);
 496
 497         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 498         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 499         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 500         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 501         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 502         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 503         if (tm->tm_mon > 0)
 504                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 505         tm->tm_year     = 0xffff;
 506
 507         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 508
 509         spin_unlock_irq(&rtc->lock);
 510
 511         return 0;
 512 }
 513
 514 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 515                                             int value, int reg_off)
 516 {
 517         /* < 0 for a value that is ignored */
 518         if (value < 0)
 519                 writeb(0, rtc->regbase + reg_off);
 520         else
 521                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 522 }
 523
 524 static int sh_rtc_check_alarm(struct rtc_time *tm)
 525 {
 526         /*
 527          * The original rtc says anything > 0xc0 is "don't care" or "match
 528          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 529          * The original rtc doesn't support years - some things use -1 and
 530          * some 0xffff. We use -1 to make out tests easier.
 531          */
 532         if (tm->tm_year == 0xffff)
 533                 tm->tm_year = -1;
 534         if (tm->tm_mon >= 0xff)
 535                 tm->tm_mon = -1;
 536         if (tm->tm_mday >= 0xff)
 537                 tm->tm_mday = -1;
 538         if (tm->tm_wday >= 0xff)
 539                 tm->tm_wday = -1;
 540         if (tm->tm_hour >= 0xff)
 541                 tm->tm_hour = -1;
 542         if (tm->tm_min >= 0xff)
 543                 tm->tm_min = -1;
 544         if (tm->tm_sec >= 0xff)
 545                 tm->tm_sec = -1;
 546
 547         if (tm->tm_year > 9999 ||
 548                 tm->tm_mon >= 12 ||
 549                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 550                 tm->tm_wday >= 7 ||
 551                 tm->tm_hour >= 24 ||
 552                 tm->tm_min >= 60 ||
 553                 tm->tm_sec >= 60)
 554                 return -EINVAL;
 555
 556         return 0;
 557 }
 558
 559 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 560 {
 561         struct platform_device *pdev = to_platform_device(dev);
 562         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 563         unsigned int rcr1;
 564         struct rtc_time *tm = &wkalrm->time;
 565         int mon, err;
 566
 567         err = sh_rtc_check_alarm(tm);
 568         if (unlikely(err < 0))
 569                 return err;
 570
 571         spin_lock_irq(&rtc->lock);
 572
 573         /* disable alarm interrupt and clear the alarm flag */
 574         rcr1 = readb(rtc->regbase + RCR1);
 575         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 576         writeb(rcr1, rtc->regbase + RCR1);
 577
 578         /* set alarm time */
 579         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 580         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 581         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 582         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 583         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 584         mon = tm->tm_mon;
 585         if (mon >= 0)
 586                 mon += 1;
 587         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 588
 589         if (wkalrm->enabled) {
 590                 rcr1 |= RCR1_AIE;
 591                 writeb(rcr1, rtc->regbase + RCR1);
 592         }
 593
 594         spin_unlock_irq(&rtc->lock);
 595
 596         return 0;
 597 }
 598
 599 static struct rtc_class_ops sh_rtc_ops = {
 600         .ioctl          = sh_rtc_ioctl,
 601         .read_time      = sh_rtc_read_time,
 602         .set_time       = sh_rtc_set_time,
 603         .read_alarm     = sh_rtc_read_alarm,
 604         .set_alarm      = sh_rtc_set_alarm,
 605         .irq_set_state  = sh_rtc_irq_set_state,
 606         .irq_set_freq   = sh_rtc_irq_set_freq,
 607         .proc           = sh_rtc_proc,
 608 };
 609
 610 static int __init sh_rtc_probe(struct platform_device *pdev)
 611 {
 612         struct sh_rtc *rtc;
 613         struct resource *res;
 614         struct rtc_time r;
 615         char clk_name[6];
 616         int clk_id, ret;
 617
 618         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 619         if (unlikely(!rtc))
 620                 return -ENOMEM;
 621
 622         spin_lock_init(&rtc->lock);
 623
 624         /* get periodic/carry/alarm irqs */
 625         ret = platform_get_irq(pdev, 0);
 626         if (unlikely(ret <= 0)) {
 627                 ret = -ENOENT;
 628                 dev_err(&pdev->dev, "No IRQ resource\n");
 629                 goto err_badres;
 630         }
 631
 632         rtc->periodic_irq = ret;
 633         rtc->carry_irq = platform_get_irq(pdev, 1);
 634         rtc->alarm_irq = platform_get_irq(pdev, 2);
 635
 636         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 637         if (unlikely(res == NULL)) {
 638                 ret = -ENOENT;
 639                 dev_err(&pdev->dev, "No IO resource\n");
 640                 goto err_badres;
 641         }
 642
 643         rtc->regsize = resource_size(res);
 644
 645         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 646         if (unlikely(!rtc->res)) {
 647                 ret = -EBUSY;
 648                 goto err_badres;
 649         }
 650
 651         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 652         if (unlikely(!rtc->regbase)) {
 653                 ret = -EINVAL;
 654                 goto err_badmap;
 655         }
 656
 657         clk_id = pdev->id;
 658         /* With a single device, the clock id is still "rtc0" */
 659         if (clk_id < 0)
 660                 clk_id = 0;
 661
 662         snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
 663
 664         rtc->clk = clk_get(&pdev->dev, clk_name);
 665         if (IS_ERR(rtc->clk)) {
 666                 /*
 667                  * No error handling for rtc->clk intentionally, not all
 668                  * platforms will have a unique clock for the RTC, and
 669                  * the clk API can handle the struct clk pointer being
 670                  * NULL.
 671                  */
 672                 rtc->clk = NULL;
 673         }
 674
 675         clk_enable(rtc->clk);
 676
 677         rtc->capabilities = RTC_DEF_CAPABILITIES;
 678         if (pdev->dev.platform_data) {
 679                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 680
 681                 /*
 682                  * Some CPUs have special capabilities in addition to the
 683                  * default set. Add those in here.
 684                  */
 685                 rtc->capabilities |= pinfo->capabilities;
 686         }
 687
 688         if (rtc->carry_irq <= 0) {
 689                 /* register shared periodic/carry/alarm irq */
 690                 ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
 691                                   IRQF_DISABLED, "sh-rtc", rtc);
 692                 if (unlikely(ret)) {
 693                         dev_err(&pdev->dev,
 694                                 "request IRQ failed with %d, IRQ %d\n", ret,
 695                                 rtc->periodic_irq);
 696                         goto err_unmap;
 697                 }
 698         } else {
 699                 /* register periodic/carry/alarm irqs */
 700                 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
 701                                   IRQF_DISABLED, "sh-rtc period", rtc);
 702                 if (unlikely(ret)) {
 703                         dev_err(&pdev->dev,
 704                                 "request period IRQ failed with %d, IRQ %d\n",
 705                                 ret, rtc->periodic_irq);
 706                         goto err_unmap;
 707                 }
 708
 709                 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
 710                                   IRQF_DISABLED, "sh-rtc carry", rtc);
 711                 if (unlikely(ret)) {
 712                         dev_err(&pdev->dev,
 713                                 "request carry IRQ failed with %d, IRQ %d\n",
 714                                 ret, rtc->carry_irq);
 715                         free_irq(rtc->periodic_irq, rtc);
 716                         goto err_unmap;
 717                 }
 718
 719                 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
 720                                   IRQF_DISABLED, "sh-rtc alarm", rtc);
 721                 if (unlikely(ret)) {
 722                         dev_err(&pdev->dev,
 723                                 "request alarm IRQ failed with %d, IRQ %d\n",
 724                                 ret, rtc->alarm_irq);
 725                         free_irq(rtc->carry_irq, rtc);
 726                         free_irq(rtc->periodic_irq, rtc);
 727                         goto err_unmap;
 728                 }
 729         }
 730
 731         platform_set_drvdata(pdev, rtc);
 732
 733         /* everything disabled by default */
 734         sh_rtc_irq_set_freq(&pdev->dev, 0);
 735         sh_rtc_irq_set_state(&pdev->dev, 0);
 736         sh_rtc_setaie(&pdev->dev, 0);
 737         sh_rtc_setcie(&pdev->dev, 0);
 738
 739         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 740                                            &sh_rtc_ops, THIS_MODULE);
 741         if (IS_ERR(rtc->rtc_dev)) {
 742                 ret = PTR_ERR(rtc->rtc_dev);
 743                 free_irq(rtc->periodic_irq, rtc);
 744                 free_irq(rtc->carry_irq, rtc);
 745                 free_irq(rtc->alarm_irq, rtc);
 746                 goto err_unmap;
 747         }
 748
 749         rtc->rtc_dev->max_user_freq = 256;
 750
 751         /* reset rtc to epoch 0 if time is invalid */
 752         if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
 753                 rtc_time_to_tm(0, &r);
 754                 rtc_set_time(rtc->rtc_dev, &r);
 755         }
 756
 757         device_init_wakeup(&pdev->dev, 1);
 758         return 0;
 759
 760 err_unmap:
 761         clk_disable(rtc->clk);
 762         clk_put(rtc->clk);
 763         iounmap(rtc->regbase);
 764 err_badmap:
 765         release_resource(rtc->res);
 766 err_badres:
 767         kfree(rtc);
 768
 769         return ret;
 770 }
 771
 772 static int __exit sh_rtc_remove(struct platform_device *pdev)
 773 {
 774         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 775
 776         rtc_device_unregister(rtc->rtc_dev);
 777         sh_rtc_irq_set_state(&pdev->dev, 0);
 778
 779         sh_rtc_setaie(&pdev->dev, 0);
 780         sh_rtc_setcie(&pdev->dev, 0);
 781
 782         free_irq(rtc->periodic_irq, rtc);
 783
 784         if (rtc->carry_irq > 0) {
 785                 free_irq(rtc->carry_irq, rtc);
 786                 free_irq(rtc->alarm_irq, rtc);
 787         }
 788
 789         iounmap(rtc->regbase);
 790         release_resource(rtc->res);
 791
 792         clk_disable(rtc->clk);
 793         clk_put(rtc->clk);
 794
 795         platform_set_drvdata(pdev, NULL);
 796
 797         kfree(rtc);
 798
 799         return 0;
 800 }
 801
 802 static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
 803 {
 804         struct platform_device *pdev = to_platform_device(dev);
 805         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 806
 807         set_irq_wake(rtc->periodic_irq, enabled);
 808
 809         if (rtc->carry_irq > 0) {
 810                 set_irq_wake(rtc->carry_irq, enabled);
 811                 set_irq_wake(rtc->alarm_irq, enabled);
 812         }
 813 }
 814
 815 static int sh_rtc_suspend(struct device *dev)
 816 {
 817         if (device_may_wakeup(dev))
 818                 sh_rtc_set_irq_wake(dev, 1);
 819
 820         return 0;
 821 }
 822
 823 static int sh_rtc_resume(struct device *dev)
 824 {
 825         if (device_may_wakeup(dev))
 826                 sh_rtc_set_irq_wake(dev, 0);
 827
 828         return 0;
 829 }
 830
 831 static struct dev_pm_ops sh_rtc_dev_pm_ops = {
 832         .suspend = sh_rtc_suspend,
 833         .resume = sh_rtc_resume,
 834 };
 835
 836 static struct platform_driver sh_rtc_platform_driver = {
 837         .driver         = {
 838                 .name   = DRV_NAME,
 839                 .owner  = THIS_MODULE,
 840                 .pm     = &sh_rtc_dev_pm_ops,
 841         },
 842         .remove         = __exit_p(sh_rtc_remove),
 843 };
 844
 845 static int __init sh_rtc_init(void)
 846 {
 847         return platform_driver_probe(&sh_rtc_platform_driver, sh_rtc_probe);
 848 }
 849
 850 static void __exit sh_rtc_exit(void)
 851 {
 852         platform_driver_unregister(&sh_rtc_platform_driver);
 853 }
 854
 855 module_init(sh_rtc_init);
 856 module_exit(sh_rtc_exit);
 857
 858 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 859 MODULE_VERSION(DRV_VERSION);
 860 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 861               "Jamie Lenehan <lenehan@twibble.org>, "
 862               "Angelo Castello <angelo.castello@st.com>");
 863 MODULE_LICENSE("GPL");
 864 MODULE_ALIAS("platform:" DRV_NAME);