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 - 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     "0.2.2"
  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 inline void sh_rtc_setpie(struct device *dev, unsigned 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                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
 229                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 230         } else
 231                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 232
 233         writeb(tmp, rtc->regbase + RCR2);
 234
 235         spin_unlock_irq(&rtc->lock);
 236 }
 237
 238 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
 239 {
 240         struct sh_rtc *rtc = dev_get_drvdata(dev);
 241         int tmp, ret = 0;
 242
 243         spin_lock_irq(&rtc->lock);
 244         tmp = rtc->periodic_freq & PF_MASK;
 245
 246         switch (freq) {
 247         case 0:
 248                 rtc->periodic_freq = 0x00;
 249                 break;
 250         case 1:
 251                 rtc->periodic_freq = 0x60;
 252                 break;
 253         case 2:
 254                 rtc->periodic_freq = 0x50;
 255                 break;
 256         case 4:
 257                 rtc->periodic_freq = 0x40;
 258                 break;
 259         case 8:
 260                 rtc->periodic_freq = 0x30 | PF_HP;
 261                 break;
 262         case 16:
 263                 rtc->periodic_freq = 0x30;
 264                 break;
 265         case 32:
 266                 rtc->periodic_freq = 0x20 | PF_HP;
 267                 break;
 268         case 64:
 269                 rtc->periodic_freq = 0x20;
 270                 break;
 271         case 128:
 272                 rtc->periodic_freq = 0x10 | PF_HP;
 273                 break;
 274         case 256:
 275                 rtc->periodic_freq = 0x10;
 276                 break;
 277         default:
 278                 ret = -ENOTSUPP;
 279         }
 280
 281         if (ret == 0) {
 282                 rtc->periodic_freq |= tmp;
 283                 rtc->rtc_dev->irq_freq = freq;
 284         }
 285
 286         spin_unlock_irq(&rtc->lock);
 287         return ret;
 288 }
 289
 290 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 291 {
 292         struct sh_rtc *rtc = dev_get_drvdata(dev);
 293         unsigned int tmp;
 294
 295         spin_lock_irq(&rtc->lock);
 296
 297         tmp = readb(rtc->regbase + RCR1);
 298
 299         if (enable)
 300                 tmp |= RCR1_AIE;
 301         else
 302                 tmp &= ~RCR1_AIE;
 303
 304         writeb(tmp, rtc->regbase + RCR1);
 305
 306         spin_unlock_irq(&rtc->lock);
 307 }
 308
 309 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 310 {
 311         struct sh_rtc *rtc = dev_get_drvdata(dev);
 312         unsigned int tmp;
 313
 314         tmp = readb(rtc->regbase + RCR1);
 315         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 316
 317         tmp = readb(rtc->regbase + RCR2);
 318         seq_printf(seq, "periodic_IRQ\t: %s\n",
 319                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 320
 321         return 0;
 322 }
 323
 324 static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
 325 {
 326         struct sh_rtc *rtc = dev_get_drvdata(dev);
 327         unsigned int tmp;
 328
 329         spin_lock_irq(&rtc->lock);
 330
 331         tmp = readb(rtc->regbase + RCR1);
 332
 333         if (!enable)
 334                 tmp &= ~RCR1_CIE;
 335         else
 336                 tmp |= RCR1_CIE;
 337
 338         writeb(tmp, rtc->regbase + RCR1);
 339
 340         spin_unlock_irq(&rtc->lock);
 341 }
 342
 343 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 344 {
 345         struct sh_rtc *rtc = dev_get_drvdata(dev);
 346         unsigned int ret = 0;
 347
 348         switch (cmd) {
 349         case RTC_PIE_OFF:
 350         case RTC_PIE_ON:
 351                 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
 352                 break;
 353         case RTC_AIE_OFF:
 354         case RTC_AIE_ON:
 355                 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
 356                 break;
 357         case RTC_UIE_OFF:
 358                 rtc->periodic_freq &= ~PF_OXS;
 359                 sh_rtc_setcie(dev, 0);
 360                 break;
 361         case RTC_UIE_ON:
 362                 rtc->periodic_freq |= PF_OXS;
 363                 sh_rtc_setcie(dev, 1);
 364                 break;
 365         case RTC_IRQP_READ:
 366                 ret = put_user(rtc->rtc_dev->irq_freq,
 367                                (unsigned long __user *)arg);
 368                 break;
 369         case RTC_IRQP_SET:
 370                 ret = sh_rtc_setfreq(dev, arg);
 371                 break;
 372         default:
 373                 ret = -ENOIOCTLCMD;
 374         }
 375
 376         return ret;
 377 }
 378
 379 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 380 {
 381         struct platform_device *pdev = to_platform_device(dev);
 382         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 383         unsigned int sec128, sec2, yr, yr100, cf_bit;
 384
 385         do {
 386                 unsigned int tmp;
 387
 388                 spin_lock_irq(&rtc->lock);
 389
 390                 tmp = readb(rtc->regbase + RCR1);
 391                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 392                 tmp |= RCR1_CIE;
 393                 writeb(tmp, rtc->regbase + RCR1);
 394
 395                 sec128 = readb(rtc->regbase + R64CNT);
 396
 397                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 398                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 399                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 400                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 401                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 402                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 403
 404                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 405                         yr  = readw(rtc->regbase + RYRCNT);
 406                         yr100 = bcd2bin(yr >> 8);
 407                         yr &= 0xff;
 408                 } else {
 409                         yr  = readb(rtc->regbase + RYRCNT);
 410                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 411                 }
 412
 413                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 414
 415                 sec2 = readb(rtc->regbase + R64CNT);
 416                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 417
 418                 spin_unlock_irq(&rtc->lock);
 419         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 420
 421 #if RTC_BIT_INVERTED != 0
 422         if ((sec128 & RTC_BIT_INVERTED))
 423                 tm->tm_sec--;
 424 #endif
 425
 426         /* only keep the carry interrupt enabled if UIE is on */
 427         if (!(rtc->periodic_freq & PF_OXS))
 428                 sh_rtc_setcie(dev, 0);
 429
 430         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 431                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 432                 __func__,
 433                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 434                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 435
 436         return rtc_valid_tm(tm);
 437 }
 438
 439 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 440 {
 441         struct platform_device *pdev = to_platform_device(dev);
 442         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 443         unsigned int tmp;
 444         int year;
 445
 446         spin_lock_irq(&rtc->lock);
 447
 448         /* Reset pre-scaler & stop RTC */
 449         tmp = readb(rtc->regbase + RCR2);
 450         tmp |= RCR2_RESET;
 451         tmp &= ~RCR2_START;
 452         writeb(tmp, rtc->regbase + RCR2);
 453
 454         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 455         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 456         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 457         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 458         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 459         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 460
 461         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 462                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 463                         bin2bcd(tm->tm_year % 100);
 464                 writew(year, rtc->regbase + RYRCNT);
 465         } else {
 466                 year = tm->tm_year % 100;
 467                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 468         }
 469
 470         /* Start RTC */
 471         tmp = readb(rtc->regbase + RCR2);
 472         tmp &= ~RCR2_RESET;
 473         tmp |= RCR2_RTCEN | RCR2_START;
 474         writeb(tmp, rtc->regbase + RCR2);
 475
 476         spin_unlock_irq(&rtc->lock);
 477
 478         return 0;
 479 }
 480
 481 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 482 {
 483         unsigned int byte;
 484         int value = 0xff;       /* return 0xff for ignored values */
 485
 486         byte = readb(rtc->regbase + reg_off);
 487         if (byte & AR_ENB) {
 488                 byte &= ~AR_ENB;        /* strip the enable bit */
 489                 value = bcd2bin(byte);
 490         }
 491
 492         return value;
 493 }
 494
 495 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 496 {
 497         struct platform_device *pdev = to_platform_device(dev);
 498         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 499         struct rtc_time *tm = &wkalrm->time;
 500
 501         spin_lock_irq(&rtc->lock);
 502
 503         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 504         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 505         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 506         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 507         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 508         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 509         if (tm->tm_mon > 0)
 510                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 511         tm->tm_year     = 0xffff;
 512
 513         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 514
 515         spin_unlock_irq(&rtc->lock);
 516
 517         return 0;
 518 }
 519
 520 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 521                                             int value, int reg_off)
 522 {
 523         /* < 0 for a value that is ignored */
 524         if (value < 0)
 525                 writeb(0, rtc->regbase + reg_off);
 526         else
 527                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 528 }
 529
 530 static int sh_rtc_check_alarm(struct rtc_time *tm)
 531 {
 532         /*
 533          * The original rtc says anything > 0xc0 is "don't care" or "match
 534          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 535          * The original rtc doesn't support years - some things use -1 and
 536          * some 0xffff. We use -1 to make out tests easier.
 537          */
 538         if (tm->tm_year == 0xffff)
 539                 tm->tm_year = -1;
 540         if (tm->tm_mon >= 0xff)
 541                 tm->tm_mon = -1;
 542         if (tm->tm_mday >= 0xff)
 543                 tm->tm_mday = -1;
 544         if (tm->tm_wday >= 0xff)
 545                 tm->tm_wday = -1;
 546         if (tm->tm_hour >= 0xff)
 547                 tm->tm_hour = -1;
 548         if (tm->tm_min >= 0xff)
 549                 tm->tm_min = -1;
 550         if (tm->tm_sec >= 0xff)
 551                 tm->tm_sec = -1;
 552
 553         if (tm->tm_year > 9999 ||
 554                 tm->tm_mon >= 12 ||
 555                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 556                 tm->tm_wday >= 7 ||
 557                 tm->tm_hour >= 24 ||
 558                 tm->tm_min >= 60 ||
 559                 tm->tm_sec >= 60)
 560                 return -EINVAL;
 561
 562         return 0;
 563 }
 564
 565 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 566 {
 567         struct platform_device *pdev = to_platform_device(dev);
 568         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 569         unsigned int rcr1;
 570         struct rtc_time *tm = &wkalrm->time;
 571         int mon, err;
 572
 573         err = sh_rtc_check_alarm(tm);
 574         if (unlikely(err < 0))
 575                 return err;
 576
 577         spin_lock_irq(&rtc->lock);
 578
 579         /* disable alarm interrupt and clear the alarm flag */
 580         rcr1 = readb(rtc->regbase + RCR1);
 581         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 582         writeb(rcr1, rtc->regbase + RCR1);
 583
 584         /* set alarm time */
 585         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 586         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 587         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 588         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 589         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 590         mon = tm->tm_mon;
 591         if (mon >= 0)
 592                 mon += 1;
 593         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 594
 595         if (wkalrm->enabled) {
 596                 rcr1 |= RCR1_AIE;
 597                 writeb(rcr1, rtc->regbase + RCR1);
 598         }
 599
 600         spin_unlock_irq(&rtc->lock);
 601
 602         return 0;
 603 }
 604
 605 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
 606 {
 607         struct platform_device *pdev = to_platform_device(dev);
 608         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 609
 610         if (enabled) {
 611                 rtc->periodic_freq |= PF_KOU;
 612                 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
 613         } else {
 614                 rtc->periodic_freq &= ~PF_KOU;
 615                 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
 616         }
 617 }
 618
 619 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 620 {
 621         if (!is_power_of_2(freq))
 622                 return -EINVAL;
 623
 624         return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
 625 }
 626
 627 static struct rtc_class_ops sh_rtc_ops = {
 628         .ioctl          = sh_rtc_ioctl,
 629         .read_time      = sh_rtc_read_time,
 630         .set_time       = sh_rtc_set_time,
 631         .read_alarm     = sh_rtc_read_alarm,
 632         .set_alarm      = sh_rtc_set_alarm,
 633         .irq_set_state  = sh_rtc_irq_set_state,
 634         .irq_set_freq   = sh_rtc_irq_set_freq,
 635         .proc           = sh_rtc_proc,
 636 };
 637
 638 static int __devinit sh_rtc_probe(struct platform_device *pdev)
 639 {
 640         struct sh_rtc *rtc;
 641         struct resource *res;
 642         struct rtc_time r;
 643         char clk_name[6];
 644         int clk_id, 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
 660         rtc->periodic_irq = ret;
 661         rtc->carry_irq = platform_get_irq(pdev, 1);
 662         rtc->alarm_irq = platform_get_irq(pdev, 2);
 663
 664         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 665         if (unlikely(res == NULL)) {
 666                 ret = -ENOENT;
 667                 dev_err(&pdev->dev, "No IO resource\n");
 668                 goto err_badres;
 669         }
 670
 671         rtc->regsize = resource_size(res);
 672
 673         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 674         if (unlikely(!rtc->res)) {
 675                 ret = -EBUSY;
 676                 goto err_badres;
 677         }
 678
 679         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 680         if (unlikely(!rtc->regbase)) {
 681                 ret = -EINVAL;
 682                 goto err_badmap;
 683         }
 684
 685         clk_id = pdev->id;
 686         /* With a single device, the clock id is still "rtc0" */
 687         if (clk_id < 0)
 688                 clk_id = 0;
 689
 690         snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
 691
 692         rtc->clk = clk_get(&pdev->dev, clk_name);
 693         if (IS_ERR(rtc->clk)) {
 694                 /*
 695                  * No error handling for rtc->clk intentionally, not all
 696                  * platforms will have a unique clock for the RTC, and
 697                  * the clk API can handle the struct clk pointer being
 698                  * NULL.
 699                  */
 700                 rtc->clk = NULL;
 701         }
 702
 703         clk_enable(rtc->clk);
 704
 705         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 706                                            &sh_rtc_ops, THIS_MODULE);
 707         if (IS_ERR(rtc->rtc_dev)) {
 708                 ret = PTR_ERR(rtc->rtc_dev);
 709                 goto err_unmap;
 710         }
 711
 712         rtc->capabilities = RTC_DEF_CAPABILITIES;
 713         if (pdev->dev.platform_data) {
 714                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 715
 716                 /*
 717                  * Some CPUs have special capabilities in addition to the
 718                  * default set. Add those in here.
 719                  */
 720                 rtc->capabilities |= pinfo->capabilities;
 721         }
 722
 723         rtc->rtc_dev->max_user_freq = 256;
 724
 725         platform_set_drvdata(pdev, rtc);
 726
 727         if (rtc->carry_irq <= 0) {
 728                 /* register shared periodic/carry/alarm irq */
 729                 ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
 730                                   IRQF_DISABLED, "sh-rtc", rtc);
 731                 if (unlikely(ret)) {
 732                         dev_err(&pdev->dev,
 733                                 "request IRQ failed with %d, IRQ %d\n", ret,
 734                                 rtc->periodic_irq);
 735                         goto err_unmap;
 736                 }
 737         } else {
 738                 /* register periodic/carry/alarm irqs */
 739                 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
 740                                   IRQF_DISABLED, "sh-rtc period", rtc);
 741                 if (unlikely(ret)) {
 742                         dev_err(&pdev->dev,
 743                                 "request period IRQ failed with %d, IRQ %d\n",
 744                                 ret, rtc->periodic_irq);
 745                         goto err_unmap;
 746                 }
 747
 748                 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
 749                                   IRQF_DISABLED, "sh-rtc carry", rtc);
 750                 if (unlikely(ret)) {
 751                         dev_err(&pdev->dev,
 752                                 "request carry IRQ failed with %d, IRQ %d\n",
 753                                 ret, rtc->carry_irq);
 754                         free_irq(rtc->periodic_irq, rtc);
 755                         goto err_unmap;
 756                 }
 757
 758                 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
 759                                   IRQF_DISABLED, "sh-rtc alarm", rtc);
 760                 if (unlikely(ret)) {
 761                         dev_err(&pdev->dev,
 762                                 "request alarm IRQ failed with %d, IRQ %d\n",
 763                                 ret, rtc->alarm_irq);
 764                         free_irq(rtc->carry_irq, rtc);
 765                         free_irq(rtc->periodic_irq, rtc);
 766                         goto err_unmap;
 767                 }
 768         }
 769
 770         /* everything disabled by default */
 771         rtc->periodic_freq = 0;
 772         rtc->rtc_dev->irq_freq = 0;
 773         sh_rtc_setpie(&pdev->dev, 0);
 774         sh_rtc_setaie(&pdev->dev, 0);
 775         sh_rtc_setcie(&pdev->dev, 0);
 776
 777         /* reset rtc to epoch 0 if time is invalid */
 778         if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
 779                 rtc_time_to_tm(0, &r);
 780                 rtc_set_time(rtc->rtc_dev, &r);
 781         }
 782
 783         device_init_wakeup(&pdev->dev, 1);
 784         return 0;
 785
 786 err_unmap:
 787         clk_disable(rtc->clk);
 788         clk_put(rtc->clk);
 789         iounmap(rtc->regbase);
 790 err_badmap:
 791         release_resource(rtc->res);
 792 err_badres:
 793         kfree(rtc);
 794
 795         return ret;
 796 }
 797
 798 static int __devexit sh_rtc_remove(struct platform_device *pdev)
 799 {
 800         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 801
 802         if (likely(rtc->rtc_dev))
 803                 rtc_device_unregister(rtc->rtc_dev);
 804
 805         sh_rtc_setpie(&pdev->dev, 0);
 806         sh_rtc_setaie(&pdev->dev, 0);
 807         sh_rtc_setcie(&pdev->dev, 0);
 808
 809         free_irq(rtc->periodic_irq, rtc);
 810
 811         if (rtc->carry_irq > 0) {
 812                 free_irq(rtc->carry_irq, rtc);
 813                 free_irq(rtc->alarm_irq, rtc);
 814         }
 815
 816         release_resource(rtc->res);
 817
 818         iounmap(rtc->regbase);
 819
 820         clk_disable(rtc->clk);
 821         clk_put(rtc->clk);
 822
 823         platform_set_drvdata(pdev, NULL);
 824
 825         kfree(rtc);
 826
 827         return 0;
 828 }
 829
 830 static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
 831 {
 832         struct platform_device *pdev = to_platform_device(dev);
 833         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 834
 835         set_irq_wake(rtc->periodic_irq, enabled);
 836
 837         if (rtc->carry_irq > 0) {
 838                 set_irq_wake(rtc->carry_irq, enabled);
 839                 set_irq_wake(rtc->alarm_irq, enabled);
 840         }
 841 }
 842
 843 static int sh_rtc_suspend(struct device *dev)
 844 {
 845         if (device_may_wakeup(dev))
 846                 sh_rtc_set_irq_wake(dev, 1);
 847
 848         return 0;
 849 }
 850
 851 static int sh_rtc_resume(struct device *dev)
 852 {
 853         if (device_may_wakeup(dev))
 854                 sh_rtc_set_irq_wake(dev, 0);
 855
 856         return 0;
 857 }
 858
 859 static struct dev_pm_ops sh_rtc_dev_pm_ops = {
 860         .suspend = sh_rtc_suspend,
 861         .resume = sh_rtc_resume,
 862 };
 863
 864 static struct platform_driver sh_rtc_platform_driver = {
 865         .driver         = {
 866                 .name   = DRV_NAME,
 867                 .owner  = THIS_MODULE,
 868                 .pm     = &sh_rtc_dev_pm_ops,
 869         },
 870         .probe          = sh_rtc_probe,
 871         .remove         = __devexit_p(sh_rtc_remove),
 872 };
 873
 874 static int __init sh_rtc_init(void)
 875 {
 876         return platform_driver_register(&sh_rtc_platform_driver);
 877 }
 878
 879 static void __exit sh_rtc_exit(void)
 880 {
 881         platform_driver_unregister(&sh_rtc_platform_driver);
 882 }
 883
 884 module_init(sh_rtc_init);
 885 module_exit(sh_rtc_exit);
 886
 887 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 888 MODULE_VERSION(DRV_VERSION);
 889 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 890               "Jamie Lenehan <lenehan@twibble.org>, "
 891               "Angelo Castello <angelo.castello@st.com>");
 892 MODULE_LICENSE("GPL");
 893 MODULE_ALIAS("platform:" DRV_NAME);