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 <linux/slab.h>
  30 #include <asm/rtc.h>
  31
  32 #define DRV_NAME        "sh-rtc"
  33 #define DRV_VERSION     "0.2.3"
  34
  35 #define RTC_REG(r)      ((r) * rtc_reg_size)
  36
  37 #define R64CNT          RTC_REG(0)
  38
  39 #define RSECCNT         RTC_REG(1)      /* RTC sec */
  40 #define RMINCNT         RTC_REG(2)      /* RTC min */
  41 #define RHRCNT          RTC_REG(3)      /* RTC hour */
  42 #define RWKCNT          RTC_REG(4)      /* RTC week */
  43 #define RDAYCNT         RTC_REG(5)      /* RTC day */
  44 #define RMONCNT         RTC_REG(6)      /* RTC month */
  45 #define RYRCNT          RTC_REG(7)      /* RTC year */
  46 #define RSECAR          RTC_REG(8)      /* ALARM sec */
  47 #define RMINAR          RTC_REG(9)      /* ALARM min */
  48 #define RHRAR           RTC_REG(10)     /* ALARM hour */
  49 #define RWKAR           RTC_REG(11)     /* ALARM week */
  50 #define RDAYAR          RTC_REG(12)     /* ALARM day */
  51 #define RMONAR          RTC_REG(13)     /* ALARM month */
  52 #define RCR1            RTC_REG(14)     /* Control */
  53 #define RCR2            RTC_REG(15)     /* Control */
  54
  55 /*
  56  * Note on RYRAR and RCR3: Up until this point most of the register
  57  * definitions are consistent across all of the available parts. However,
  58  * the placement of the optional RYRAR and RCR3 (the RYRAR control
  59  * register used to control RYRCNT/RYRAR compare) varies considerably
  60  * across various parts, occasionally being mapped in to a completely
  61  * unrelated address space. For proper RYRAR support a separate resource
  62  * would have to be handed off, but as this is purely optional in
  63  * practice, we simply opt not to support it, thereby keeping the code
  64  * quite a bit more simplified.
  65  */
  66
  67 /* ALARM Bits - or with BCD encoded value */
  68 #define AR_ENB          0x80    /* Enable for alarm cmp   */
  69
  70 /* Period Bits */
  71 #define PF_HP           0x100   /* Enable Half Period to support 8,32,128Hz */
  72 #define PF_COUNT        0x200   /* Half periodic counter */
  73 #define PF_OXS          0x400   /* Periodic One x Second */
  74 #define PF_KOU          0x800   /* Kernel or User periodic request 1=kernel */
  75 #define PF_MASK         0xf00
  76
  77 /* RCR1 Bits */
  78 #define RCR1_CF         0x80    /* Carry Flag             */
  79 #define RCR1_CIE        0x10    /* Carry Interrupt Enable */
  80 #define RCR1_AIE        0x08    /* Alarm Interrupt Enable */
  81 #define RCR1_AF         0x01    /* Alarm Flag             */
  82
  83 /* RCR2 Bits */
  84 #define RCR2_PEF        0x80    /* PEriodic interrupt Flag */
  85 #define RCR2_PESMASK    0x70    /* Periodic interrupt Set  */
  86 #define RCR2_RTCEN      0x08    /* ENable RTC              */
  87 #define RCR2_ADJ        0x04    /* ADJustment (30-second)  */
  88 #define RCR2_RESET      0x02    /* Reset bit               */
  89 #define RCR2_START      0x01    /* Start bit               */
  90
  91 struct sh_rtc {
  92         void __iomem            *regbase;
  93         unsigned long           regsize;
  94         struct resource         *res;
  95         int                     alarm_irq;
  96         int                     periodic_irq;
  97         int                     carry_irq;
  98         struct clk              *clk;
  99         struct rtc_device       *rtc_dev;
 100         spinlock_t              lock;
 101         unsigned long           capabilities;   /* See asm/rtc.h for cap bits */
 102         unsigned short          periodic_freq;
 103 };
 104
 105 static int __sh_rtc_interrupt(struct sh_rtc *rtc)
 106 {
 107         unsigned int tmp, pending;
 108
 109         tmp = readb(rtc->regbase + RCR1);
 110         pending = tmp & RCR1_CF;
 111         tmp &= ~RCR1_CF;
 112         writeb(tmp, rtc->regbase + RCR1);
 113
 114         /* Users have requested One x Second IRQ */
 115         if (pending && rtc->periodic_freq & PF_OXS)
 116                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 117
 118         return pending;
 119 }
 120
 121 static int __sh_rtc_alarm(struct sh_rtc *rtc)
 122 {
 123         unsigned int tmp, pending;
 124
 125         tmp = readb(rtc->regbase + RCR1);
 126         pending = tmp & RCR1_AF;
 127         tmp &= ~(RCR1_AF | RCR1_AIE);
 128         writeb(tmp, rtc->regbase + RCR1);
 129
 130         if (pending)
 131                 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 132
 133         return pending;
 134 }
 135
 136 static int __sh_rtc_periodic(struct sh_rtc *rtc)
 137 {
 138         struct rtc_device *rtc_dev = rtc->rtc_dev;
 139         struct rtc_task *irq_task;
 140         unsigned int tmp, pending;
 141
 142         tmp = readb(rtc->regbase + RCR2);
 143         pending = tmp & RCR2_PEF;
 144         tmp &= ~RCR2_PEF;
 145         writeb(tmp, rtc->regbase + RCR2);
 146
 147         if (!pending)
 148                 return 0;
 149
 150         /* Half period enabled than one skipped and the next notified */
 151         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
 152                 rtc->periodic_freq &= ~PF_COUNT;
 153         else {
 154                 if (rtc->periodic_freq & PF_HP)
 155                         rtc->periodic_freq |= PF_COUNT;
 156                 if (rtc->periodic_freq & PF_KOU) {
 157                         spin_lock(&rtc_dev->irq_task_lock);
 158                         irq_task = rtc_dev->irq_task;
 159                         if (irq_task)
 160                                 irq_task->func(irq_task->private_data);
 161                         spin_unlock(&rtc_dev->irq_task_lock);
 162                 } else
 163                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
 164         }
 165
 166         return pending;
 167 }
 168
 169 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
 170 {
 171         struct sh_rtc *rtc = dev_id;
 172         int ret;
 173
 174         spin_lock(&rtc->lock);
 175         ret = __sh_rtc_interrupt(rtc);
 176         spin_unlock(&rtc->lock);
 177
 178         return IRQ_RETVAL(ret);
 179 }
 180
 181 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
 182 {
 183         struct sh_rtc *rtc = dev_id;
 184         int ret;
 185
 186         spin_lock(&rtc->lock);
 187         ret = __sh_rtc_alarm(rtc);
 188         spin_unlock(&rtc->lock);
 189
 190         return IRQ_RETVAL(ret);
 191 }
 192
 193 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
 194 {
 195         struct sh_rtc *rtc = dev_id;
 196         int ret;
 197
 198         spin_lock(&rtc->lock);
 199         ret = __sh_rtc_periodic(rtc);
 200         spin_unlock(&rtc->lock);
 201
 202         return IRQ_RETVAL(ret);
 203 }
 204
 205 static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
 206 {
 207         struct sh_rtc *rtc = dev_id;
 208         int ret;
 209
 210         spin_lock(&rtc->lock);
 211         ret = __sh_rtc_interrupt(rtc);
 212         ret |= __sh_rtc_alarm(rtc);
 213         ret |= __sh_rtc_periodic(rtc);
 214         spin_unlock(&rtc->lock);
 215
 216         return IRQ_RETVAL(ret);
 217 }
 218
 219 static int sh_rtc_irq_set_state(struct device *dev, int enable)
 220 {
 221         struct sh_rtc *rtc = dev_get_drvdata(dev);
 222         unsigned int tmp;
 223
 224         spin_lock_irq(&rtc->lock);
 225
 226         tmp = readb(rtc->regbase + RCR2);
 227
 228         if (enable) {
 229                 rtc->periodic_freq |= PF_KOU;
 230                 tmp &= ~RCR2_PEF;       /* Clear PES bit */
 231                 tmp |= (rtc->periodic_freq & ~PF_HP);   /* Set PES2-0 */
 232         } else {
 233                 rtc->periodic_freq &= ~PF_KOU;
 234                 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
 235         }
 236
 237         writeb(tmp, rtc->regbase + RCR2);
 238
 239         spin_unlock_irq(&rtc->lock);
 240
 241         return 0;
 242 }
 243
 244 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
 245 {
 246         struct sh_rtc *rtc = dev_get_drvdata(dev);
 247         int tmp, ret = 0;
 248
 249         spin_lock_irq(&rtc->lock);
 250         tmp = rtc->periodic_freq & PF_MASK;
 251
 252         switch (freq) {
 253         case 0:
 254                 rtc->periodic_freq = 0x00;
 255                 break;
 256         case 1:
 257                 rtc->periodic_freq = 0x60;
 258                 break;
 259         case 2:
 260                 rtc->periodic_freq = 0x50;
 261                 break;
 262         case 4:
 263                 rtc->periodic_freq = 0x40;
 264                 break;
 265         case 8:
 266                 rtc->periodic_freq = 0x30 | PF_HP;
 267                 break;
 268         case 16:
 269                 rtc->periodic_freq = 0x30;
 270                 break;
 271         case 32:
 272                 rtc->periodic_freq = 0x20 | PF_HP;
 273                 break;
 274         case 64:
 275                 rtc->periodic_freq = 0x20;
 276                 break;
 277         case 128:
 278                 rtc->periodic_freq = 0x10 | PF_HP;
 279                 break;
 280         case 256:
 281                 rtc->periodic_freq = 0x10;
 282                 break;
 283         default:
 284                 ret = -ENOTSUPP;
 285         }
 286
 287         if (ret == 0)
 288                 rtc->periodic_freq |= tmp;
 289
 290         spin_unlock_irq(&rtc->lock);
 291         return ret;
 292 }
 293
 294 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
 295 {
 296         struct sh_rtc *rtc = dev_get_drvdata(dev);
 297         unsigned int tmp;
 298
 299         spin_lock_irq(&rtc->lock);
 300
 301         tmp = readb(rtc->regbase + RCR1);
 302
 303         if (enable)
 304                 tmp |= RCR1_AIE;
 305         else
 306                 tmp &= ~RCR1_AIE;
 307
 308         writeb(tmp, rtc->regbase + RCR1);
 309
 310         spin_unlock_irq(&rtc->lock);
 311 }
 312
 313 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
 314 {
 315         struct sh_rtc *rtc = dev_get_drvdata(dev);
 316         unsigned int tmp;
 317
 318         tmp = readb(rtc->regbase + RCR1);
 319         seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
 320
 321         tmp = readb(rtc->regbase + RCR2);
 322         seq_printf(seq, "periodic_IRQ\t: %s\n",
 323                    (tmp & RCR2_PESMASK) ? "yes" : "no");
 324
 325         return 0;
 326 }
 327
 328 static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
 329 {
 330         struct sh_rtc *rtc = dev_get_drvdata(dev);
 331         unsigned int tmp;
 332
 333         spin_lock_irq(&rtc->lock);
 334
 335         tmp = readb(rtc->regbase + RCR1);
 336
 337         if (!enable)
 338                 tmp &= ~RCR1_CIE;
 339         else
 340                 tmp |= RCR1_CIE;
 341
 342         writeb(tmp, rtc->regbase + RCR1);
 343
 344         spin_unlock_irq(&rtc->lock);
 345 }
 346
 347 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 348 {
 349         struct sh_rtc *rtc = dev_get_drvdata(dev);
 350         unsigned int ret = 0;
 351
 352         switch (cmd) {
 353         case RTC_UIE_OFF:
 354                 rtc->periodic_freq &= ~PF_OXS;
 355                 sh_rtc_setcie(dev, 0);
 356                 break;
 357         case RTC_UIE_ON:
 358                 rtc->periodic_freq |= PF_OXS;
 359                 sh_rtc_setcie(dev, 1);
 360                 break;
 361         default:
 362                 ret = -ENOIOCTLCMD;
 363         }
 364
 365         return ret;
 366 }
 367
 368 static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 369 {
 370         sh_rtc_setaie(dev, enabled);
 371         return 0;
 372 }
 373
 374 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 375 {
 376         struct platform_device *pdev = to_platform_device(dev);
 377         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 378         unsigned int sec128, sec2, yr, yr100, cf_bit;
 379
 380         do {
 381                 unsigned int tmp;
 382
 383                 spin_lock_irq(&rtc->lock);
 384
 385                 tmp = readb(rtc->regbase + RCR1);
 386                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 387                 tmp |= RCR1_CIE;
 388                 writeb(tmp, rtc->regbase + RCR1);
 389
 390                 sec128 = readb(rtc->regbase + R64CNT);
 391
 392                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 393                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 394                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 395                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 396                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 397                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 398
 399                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 400                         yr  = readw(rtc->regbase + RYRCNT);
 401                         yr100 = bcd2bin(yr >> 8);
 402                         yr &= 0xff;
 403                 } else {
 404                         yr  = readb(rtc->regbase + RYRCNT);
 405                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 406                 }
 407
 408                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 409
 410                 sec2 = readb(rtc->regbase + R64CNT);
 411                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 412
 413                 spin_unlock_irq(&rtc->lock);
 414         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 415
 416 #if RTC_BIT_INVERTED != 0
 417         if ((sec128 & RTC_BIT_INVERTED))
 418                 tm->tm_sec--;
 419 #endif
 420
 421         /* only keep the carry interrupt enabled if UIE is on */
 422         if (!(rtc->periodic_freq & PF_OXS))
 423                 sh_rtc_setcie(dev, 0);
 424
 425         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 426                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 427                 __func__,
 428                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 429                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 430
 431         return rtc_valid_tm(tm);
 432 }
 433
 434 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 435 {
 436         struct platform_device *pdev = to_platform_device(dev);
 437         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 438         unsigned int tmp;
 439         int year;
 440
 441         spin_lock_irq(&rtc->lock);
 442
 443         /* Reset pre-scaler & stop RTC */
 444         tmp = readb(rtc->regbase + RCR2);
 445         tmp |= RCR2_RESET;
 446         tmp &= ~RCR2_START;
 447         writeb(tmp, rtc->regbase + RCR2);
 448
 449         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 450         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 451         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 452         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 453         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 454         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 455
 456         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 457                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 458                         bin2bcd(tm->tm_year % 100);
 459                 writew(year, rtc->regbase + RYRCNT);
 460         } else {
 461                 year = tm->tm_year % 100;
 462                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 463         }
 464
 465         /* Start RTC */
 466         tmp = readb(rtc->regbase + RCR2);
 467         tmp &= ~RCR2_RESET;
 468         tmp |= RCR2_RTCEN | RCR2_START;
 469         writeb(tmp, rtc->regbase + RCR2);
 470
 471         spin_unlock_irq(&rtc->lock);
 472
 473         return 0;
 474 }
 475
 476 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 477 {
 478         unsigned int byte;
 479         int value = 0xff;       /* return 0xff for ignored values */
 480
 481         byte = readb(rtc->regbase + reg_off);
 482         if (byte & AR_ENB) {
 483                 byte &= ~AR_ENB;        /* strip the enable bit */
 484                 value = bcd2bin(byte);
 485         }
 486
 487         return value;
 488 }
 489
 490 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 491 {
 492         struct platform_device *pdev = to_platform_device(dev);
 493         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 494         struct rtc_time *tm = &wkalrm->time;
 495
 496         spin_lock_irq(&rtc->lock);
 497
 498         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 499         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 500         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 501         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 502         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 503         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 504         if (tm->tm_mon > 0)
 505                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 506         tm->tm_year     = 0xffff;
 507
 508         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 509
 510         spin_unlock_irq(&rtc->lock);
 511
 512         return 0;
 513 }
 514
 515 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 516                                             int value, int reg_off)
 517 {
 518         /* < 0 for a value that is ignored */
 519         if (value < 0)
 520                 writeb(0, rtc->regbase + reg_off);
 521         else
 522                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 523 }
 524
 525 static int sh_rtc_check_alarm(struct rtc_time *tm)
 526 {
 527         /*
 528          * The original rtc says anything > 0xc0 is "don't care" or "match
 529          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 530          * The original rtc doesn't support years - some things use -1 and
 531          * some 0xffff. We use -1 to make out tests easier.
 532          */
 533         if (tm->tm_year == 0xffff)
 534                 tm->tm_year = -1;
 535         if (tm->tm_mon >= 0xff)
 536                 tm->tm_mon = -1;
 537         if (tm->tm_mday >= 0xff)
 538                 tm->tm_mday = -1;
 539         if (tm->tm_wday >= 0xff)
 540                 tm->tm_wday = -1;
 541         if (tm->tm_hour >= 0xff)
 542                 tm->tm_hour = -1;
 543         if (tm->tm_min >= 0xff)
 544                 tm->tm_min = -1;
 545         if (tm->tm_sec >= 0xff)
 546                 tm->tm_sec = -1;
 547
 548         if (tm->tm_year > 9999 ||
 549                 tm->tm_mon >= 12 ||
 550                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 551                 tm->tm_wday >= 7 ||
 552                 tm->tm_hour >= 24 ||
 553                 tm->tm_min >= 60 ||
 554                 tm->tm_sec >= 60)
 555                 return -EINVAL;
 556
 557         return 0;
 558 }
 559
 560 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 561 {
 562         struct platform_device *pdev = to_platform_device(dev);
 563         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 564         unsigned int rcr1;
 565         struct rtc_time *tm = &wkalrm->time;
 566         int mon, err;
 567
 568         err = sh_rtc_check_alarm(tm);
 569         if (unlikely(err < 0))
 570                 return err;
 571
 572         spin_lock_irq(&rtc->lock);
 573
 574         /* disable alarm interrupt and clear the alarm flag */
 575         rcr1 = readb(rtc->regbase + RCR1);
 576         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 577         writeb(rcr1, rtc->regbase + RCR1);
 578
 579         /* set alarm time */
 580         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 581         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 582         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 583         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 584         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 585         mon = tm->tm_mon;
 586         if (mon >= 0)
 587                 mon += 1;
 588         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 589
 590         if (wkalrm->enabled) {
 591                 rcr1 |= RCR1_AIE;
 592                 writeb(rcr1, rtc->regbase + RCR1);
 593         }
 594
 595         spin_unlock_irq(&rtc->lock);
 596
 597         return 0;
 598 }
 599
 600 static struct rtc_class_ops sh_rtc_ops = {
 601         .ioctl          = sh_rtc_ioctl,
 602         .read_time      = sh_rtc_read_time,
 603         .set_time       = sh_rtc_set_time,
 604         .read_alarm     = sh_rtc_read_alarm,
 605         .set_alarm      = sh_rtc_set_alarm,
 606         .irq_set_state  = sh_rtc_irq_set_state,
 607         .irq_set_freq   = sh_rtc_irq_set_freq,
 608         .proc           = sh_rtc_proc,
 609         .alarm_irq_enable = sh_rtc_alarm_irq_enable,
 610 };
 611
 612 static int __init sh_rtc_probe(struct platform_device *pdev)
 613 {
 614         struct sh_rtc *rtc;
 615         struct resource *res;
 616         struct rtc_time r;
 617         char clk_name[6];
 618         int clk_id, ret;
 619
 620         rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
 621         if (unlikely(!rtc))
 622                 return -ENOMEM;
 623
 624         spin_lock_init(&rtc->lock);
 625
 626         /* get periodic/carry/alarm irqs */
 627         ret = platform_get_irq(pdev, 0);
 628         if (unlikely(ret <= 0)) {
 629                 ret = -ENOENT;
 630                 dev_err(&pdev->dev, "No IRQ resource\n");
 631                 goto err_badres;
 632         }
 633
 634         rtc->periodic_irq = ret;
 635         rtc->carry_irq = platform_get_irq(pdev, 1);
 636         rtc->alarm_irq = platform_get_irq(pdev, 2);
 637
 638         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 639         if (unlikely(res == NULL)) {
 640                 ret = -ENOENT;
 641                 dev_err(&pdev->dev, "No IO resource\n");
 642                 goto err_badres;
 643         }
 644
 645         rtc->regsize = resource_size(res);
 646
 647         rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
 648         if (unlikely(!rtc->res)) {
 649                 ret = -EBUSY;
 650                 goto err_badres;
 651         }
 652
 653         rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
 654         if (unlikely(!rtc->regbase)) {
 655                 ret = -EINVAL;
 656                 goto err_badmap;
 657         }
 658
 659         clk_id = pdev->id;
 660         /* With a single device, the clock id is still "rtc0" */
 661         if (clk_id < 0)
 662                 clk_id = 0;
 663
 664         snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
 665
 666         rtc->clk = clk_get(&pdev->dev, clk_name);
 667         if (IS_ERR(rtc->clk)) {
 668                 /*
 669                  * No error handling for rtc->clk intentionally, not all
 670                  * platforms will have a unique clock for the RTC, and
 671                  * the clk API can handle the struct clk pointer being
 672                  * NULL.
 673                  */
 674                 rtc->clk = NULL;
 675         }
 676
 677         clk_enable(rtc->clk);
 678
 679         rtc->capabilities = RTC_DEF_CAPABILITIES;
 680         if (pdev->dev.platform_data) {
 681                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 682
 683                 /*
 684                  * Some CPUs have special capabilities in addition to the
 685                  * default set. Add those in here.
 686                  */
 687                 rtc->capabilities |= pinfo->capabilities;
 688         }
 689
 690         if (rtc->carry_irq <= 0) {
 691                 /* register shared periodic/carry/alarm irq */
 692                 ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
 693                                   IRQF_DISABLED, "sh-rtc", rtc);
 694                 if (unlikely(ret)) {
 695                         dev_err(&pdev->dev,
 696                                 "request IRQ failed with %d, IRQ %d\n", ret,
 697                                 rtc->periodic_irq);
 698                         goto err_unmap;
 699                 }
 700         } else {
 701                 /* register periodic/carry/alarm irqs */
 702                 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
 703                                   IRQF_DISABLED, "sh-rtc period", rtc);
 704                 if (unlikely(ret)) {
 705                         dev_err(&pdev->dev,
 706                                 "request period IRQ failed with %d, IRQ %d\n",
 707                                 ret, rtc->periodic_irq);
 708                         goto err_unmap;
 709                 }
 710
 711                 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
 712                                   IRQF_DISABLED, "sh-rtc carry", rtc);
 713                 if (unlikely(ret)) {
 714                         dev_err(&pdev->dev,
 715                                 "request carry IRQ failed with %d, IRQ %d\n",
 716                                 ret, rtc->carry_irq);
 717                         free_irq(rtc->periodic_irq, rtc);
 718                         goto err_unmap;
 719                 }
 720
 721                 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
 722                                   IRQF_DISABLED, "sh-rtc alarm", rtc);
 723                 if (unlikely(ret)) {
 724                         dev_err(&pdev->dev,
 725                                 "request alarm IRQ failed with %d, IRQ %d\n",
 726                                 ret, rtc->alarm_irq);
 727                         free_irq(rtc->carry_irq, rtc);
 728                         free_irq(rtc->periodic_irq, rtc);
 729                         goto err_unmap;
 730                 }
 731         }
 732
 733         platform_set_drvdata(pdev, rtc);
 734
 735         /* everything disabled by default */
 736         sh_rtc_irq_set_freq(&pdev->dev, 0);
 737         sh_rtc_irq_set_state(&pdev->dev, 0);
 738         sh_rtc_setaie(&pdev->dev, 0);
 739         sh_rtc_setcie(&pdev->dev, 0);
 740
 741         rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
 742                                            &sh_rtc_ops, THIS_MODULE);
 743         if (IS_ERR(rtc->rtc_dev)) {
 744                 ret = PTR_ERR(rtc->rtc_dev);
 745                 free_irq(rtc->periodic_irq, rtc);
 746                 free_irq(rtc->carry_irq, rtc);
 747                 free_irq(rtc->alarm_irq, rtc);
 748                 goto err_unmap;
 749         }
 750
 751         rtc->rtc_dev->max_user_freq = 256;
 752
 753         /* reset rtc to epoch 0 if time is invalid */
 754         if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
 755                 rtc_time_to_tm(0, &r);
 756                 rtc_set_time(rtc->rtc_dev, &r);
 757         }
 758
 759         device_init_wakeup(&pdev->dev, 1);
 760         return 0;
 761
 762 err_unmap:
 763         clk_disable(rtc->clk);
 764         clk_put(rtc->clk);
 765         iounmap(rtc->regbase);
 766 err_badmap:
 767         release_mem_region(rtc->res->start, rtc->regsize);
 768 err_badres:
 769         kfree(rtc);
 770
 771         return ret;
 772 }
 773
 774 static int __exit sh_rtc_remove(struct platform_device *pdev)
 775 {
 776         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 777
 778         rtc_device_unregister(rtc->rtc_dev);
 779         sh_rtc_irq_set_state(&pdev->dev, 0);
 780
 781         sh_rtc_setaie(&pdev->dev, 0);
 782         sh_rtc_setcie(&pdev->dev, 0);
 783
 784         free_irq(rtc->periodic_irq, rtc);
 785
 786         if (rtc->carry_irq > 0) {
 787                 free_irq(rtc->carry_irq, rtc);
 788                 free_irq(rtc->alarm_irq, rtc);
 789         }
 790
 791         iounmap(rtc->regbase);
 792         release_mem_region(rtc->res->start, rtc->regsize);
 793
 794         clk_disable(rtc->clk);
 795         clk_put(rtc->clk);
 796
 797         platform_set_drvdata(pdev, NULL);
 798
 799         kfree(rtc);
 800
 801         return 0;
 802 }
 803
 804 static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
 805 {
 806         struct platform_device *pdev = to_platform_device(dev);
 807         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 808
 809         set_irq_wake(rtc->periodic_irq, enabled);
 810
 811         if (rtc->carry_irq > 0) {
 812                 set_irq_wake(rtc->carry_irq, enabled);
 813                 set_irq_wake(rtc->alarm_irq, enabled);
 814         }
 815 }
 816
 817 static int sh_rtc_suspend(struct device *dev)
 818 {
 819         if (device_may_wakeup(dev))
 820                 sh_rtc_set_irq_wake(dev, 1);
 821
 822         return 0;
 823 }
 824
 825 static int sh_rtc_resume(struct device *dev)
 826 {
 827         if (device_may_wakeup(dev))
 828                 sh_rtc_set_irq_wake(dev, 0);
 829
 830         return 0;
 831 }
 832
 833 static const struct dev_pm_ops sh_rtc_dev_pm_ops = {
 834         .suspend = sh_rtc_suspend,
 835         .resume = sh_rtc_resume,
 836 };
 837
 838 static struct platform_driver sh_rtc_platform_driver = {
 839         .driver         = {
 840                 .name   = DRV_NAME,
 841                 .owner  = THIS_MODULE,
 842                 .pm     = &sh_rtc_dev_pm_ops,
 843         },
 844         .remove         = __exit_p(sh_rtc_remove),
 845 };
 846
 847 static int __init sh_rtc_init(void)
 848 {
 849         return platform_driver_probe(&sh_rtc_platform_driver, sh_rtc_probe);
 850 }
 851
 852 static void __exit sh_rtc_exit(void)
 853 {
 854         platform_driver_unregister(&sh_rtc_platform_driver);
 855 }
 856
 857 module_init(sh_rtc_init);
 858 module_exit(sh_rtc_exit);
 859
 860 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 861 MODULE_VERSION(DRV_VERSION);
 862 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 863               "Jamie Lenehan <lenehan@twibble.org>, "
 864               "Angelo Castello <angelo.castello@st.com>");
 865 MODULE_LICENSE("GPL");
 866 MODULE_ALIAS("platform:" DRV_NAME);