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_alarm_irq_enable(struct device *dev, unsigned int enabled)
 348 {
 349         sh_rtc_setaie(dev, enabled);
 350         return 0;
 351 }
 352
 353 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
 354 {
 355         struct platform_device *pdev = to_platform_device(dev);
 356         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 357         unsigned int sec128, sec2, yr, yr100, cf_bit;
 358
 359         do {
 360                 unsigned int tmp;
 361
 362                 spin_lock_irq(&rtc->lock);
 363
 364                 tmp = readb(rtc->regbase + RCR1);
 365                 tmp &= ~RCR1_CF; /* Clear CF-bit */
 366                 tmp |= RCR1_CIE;
 367                 writeb(tmp, rtc->regbase + RCR1);
 368
 369                 sec128 = readb(rtc->regbase + R64CNT);
 370
 371                 tm->tm_sec      = bcd2bin(readb(rtc->regbase + RSECCNT));
 372                 tm->tm_min      = bcd2bin(readb(rtc->regbase + RMINCNT));
 373                 tm->tm_hour     = bcd2bin(readb(rtc->regbase + RHRCNT));
 374                 tm->tm_wday     = bcd2bin(readb(rtc->regbase + RWKCNT));
 375                 tm->tm_mday     = bcd2bin(readb(rtc->regbase + RDAYCNT));
 376                 tm->tm_mon      = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
 377
 378                 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 379                         yr  = readw(rtc->regbase + RYRCNT);
 380                         yr100 = bcd2bin(yr >> 8);
 381                         yr &= 0xff;
 382                 } else {
 383                         yr  = readb(rtc->regbase + RYRCNT);
 384                         yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
 385                 }
 386
 387                 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
 388
 389                 sec2 = readb(rtc->regbase + R64CNT);
 390                 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
 391
 392                 spin_unlock_irq(&rtc->lock);
 393         } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
 394
 395 #if RTC_BIT_INVERTED != 0
 396         if ((sec128 & RTC_BIT_INVERTED))
 397                 tm->tm_sec--;
 398 #endif
 399
 400         /* only keep the carry interrupt enabled if UIE is on */
 401         if (!(rtc->periodic_freq & PF_OXS))
 402                 sh_rtc_setcie(dev, 0);
 403
 404         dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 405                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 406                 __func__,
 407                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 408                 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
 409
 410         return rtc_valid_tm(tm);
 411 }
 412
 413 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
 414 {
 415         struct platform_device *pdev = to_platform_device(dev);
 416         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 417         unsigned int tmp;
 418         int year;
 419
 420         spin_lock_irq(&rtc->lock);
 421
 422         /* Reset pre-scaler & stop RTC */
 423         tmp = readb(rtc->regbase + RCR2);
 424         tmp |= RCR2_RESET;
 425         tmp &= ~RCR2_START;
 426         writeb(tmp, rtc->regbase + RCR2);
 427
 428         writeb(bin2bcd(tm->tm_sec),  rtc->regbase + RSECCNT);
 429         writeb(bin2bcd(tm->tm_min),  rtc->regbase + RMINCNT);
 430         writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
 431         writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
 432         writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
 433         writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
 434
 435         if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
 436                 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
 437                         bin2bcd(tm->tm_year % 100);
 438                 writew(year, rtc->regbase + RYRCNT);
 439         } else {
 440                 year = tm->tm_year % 100;
 441                 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
 442         }
 443
 444         /* Start RTC */
 445         tmp = readb(rtc->regbase + RCR2);
 446         tmp &= ~RCR2_RESET;
 447         tmp |= RCR2_RTCEN | RCR2_START;
 448         writeb(tmp, rtc->regbase + RCR2);
 449
 450         spin_unlock_irq(&rtc->lock);
 451
 452         return 0;
 453 }
 454
 455 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
 456 {
 457         unsigned int byte;
 458         int value = 0xff;       /* return 0xff for ignored values */
 459
 460         byte = readb(rtc->regbase + reg_off);
 461         if (byte & AR_ENB) {
 462                 byte &= ~AR_ENB;        /* strip the enable bit */
 463                 value = bcd2bin(byte);
 464         }
 465
 466         return value;
 467 }
 468
 469 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 470 {
 471         struct platform_device *pdev = to_platform_device(dev);
 472         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 473         struct rtc_time *tm = &wkalrm->time;
 474
 475         spin_lock_irq(&rtc->lock);
 476
 477         tm->tm_sec      = sh_rtc_read_alarm_value(rtc, RSECAR);
 478         tm->tm_min      = sh_rtc_read_alarm_value(rtc, RMINAR);
 479         tm->tm_hour     = sh_rtc_read_alarm_value(rtc, RHRAR);
 480         tm->tm_wday     = sh_rtc_read_alarm_value(rtc, RWKAR);
 481         tm->tm_mday     = sh_rtc_read_alarm_value(rtc, RDAYAR);
 482         tm->tm_mon      = sh_rtc_read_alarm_value(rtc, RMONAR);
 483         if (tm->tm_mon > 0)
 484                 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
 485         tm->tm_year     = 0xffff;
 486
 487         wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
 488
 489         spin_unlock_irq(&rtc->lock);
 490
 491         return 0;
 492 }
 493
 494 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
 495                                             int value, int reg_off)
 496 {
 497         /* < 0 for a value that is ignored */
 498         if (value < 0)
 499                 writeb(0, rtc->regbase + reg_off);
 500         else
 501                 writeb(bin2bcd(value) | AR_ENB,  rtc->regbase + reg_off);
 502 }
 503
 504 static int sh_rtc_check_alarm(struct rtc_time *tm)
 505 {
 506         /*
 507          * The original rtc says anything > 0xc0 is "don't care" or "match
 508          * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
 509          * The original rtc doesn't support years - some things use -1 and
 510          * some 0xffff. We use -1 to make out tests easier.
 511          */
 512         if (tm->tm_year == 0xffff)
 513                 tm->tm_year = -1;
 514         if (tm->tm_mon >= 0xff)
 515                 tm->tm_mon = -1;
 516         if (tm->tm_mday >= 0xff)
 517                 tm->tm_mday = -1;
 518         if (tm->tm_wday >= 0xff)
 519                 tm->tm_wday = -1;
 520         if (tm->tm_hour >= 0xff)
 521                 tm->tm_hour = -1;
 522         if (tm->tm_min >= 0xff)
 523                 tm->tm_min = -1;
 524         if (tm->tm_sec >= 0xff)
 525                 tm->tm_sec = -1;
 526
 527         if (tm->tm_year > 9999 ||
 528                 tm->tm_mon >= 12 ||
 529                 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
 530                 tm->tm_wday >= 7 ||
 531                 tm->tm_hour >= 24 ||
 532                 tm->tm_min >= 60 ||
 533                 tm->tm_sec >= 60)
 534                 return -EINVAL;
 535
 536         return 0;
 537 }
 538
 539 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 540 {
 541         struct platform_device *pdev = to_platform_device(dev);
 542         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 543         unsigned int rcr1;
 544         struct rtc_time *tm = &wkalrm->time;
 545         int mon, err;
 546
 547         err = sh_rtc_check_alarm(tm);
 548         if (unlikely(err < 0))
 549                 return err;
 550
 551         spin_lock_irq(&rtc->lock);
 552
 553         /* disable alarm interrupt and clear the alarm flag */
 554         rcr1 = readb(rtc->regbase + RCR1);
 555         rcr1 &= ~(RCR1_AF | RCR1_AIE);
 556         writeb(rcr1, rtc->regbase + RCR1);
 557
 558         /* set alarm time */
 559         sh_rtc_write_alarm_value(rtc, tm->tm_sec,  RSECAR);
 560         sh_rtc_write_alarm_value(rtc, tm->tm_min,  RMINAR);
 561         sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
 562         sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
 563         sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
 564         mon = tm->tm_mon;
 565         if (mon >= 0)
 566                 mon += 1;
 567         sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 568
 569         if (wkalrm->enabled) {
 570                 rcr1 |= RCR1_AIE;
 571                 writeb(rcr1, rtc->regbase + RCR1);
 572         }
 573
 574         spin_unlock_irq(&rtc->lock);
 575
 576         return 0;
 577 }
 578
 579 static struct rtc_class_ops sh_rtc_ops = {
 580         .read_time      = sh_rtc_read_time,
 581         .set_time       = sh_rtc_set_time,
 582         .read_alarm     = sh_rtc_read_alarm,
 583         .set_alarm      = sh_rtc_set_alarm,
 584         .proc           = sh_rtc_proc,
 585         .alarm_irq_enable = sh_rtc_alarm_irq_enable,
 586 };
 587
 588 static int __init sh_rtc_probe(struct platform_device *pdev)
 589 {
 590         struct sh_rtc *rtc;
 591         struct resource *res;
 592         struct rtc_time r;
 593         char clk_name[6];
 594         int clk_id, ret;
 595
 596         rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 597         if (unlikely(!rtc))
 598                 return -ENOMEM;
 599
 600         spin_lock_init(&rtc->lock);
 601
 602         /* get periodic/carry/alarm irqs */
 603         ret = platform_get_irq(pdev, 0);
 604         if (unlikely(ret <= 0)) {
 605                 dev_err(&pdev->dev, "No IRQ resource\n");
 606                 return -ENOENT;
 607         }
 608
 609         rtc->periodic_irq = ret;
 610         rtc->carry_irq = platform_get_irq(pdev, 1);
 611         rtc->alarm_irq = platform_get_irq(pdev, 2);
 612
 613         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 614         if (unlikely(res == NULL)) {
 615                 dev_err(&pdev->dev, "No IO resource\n");
 616                 return -ENOENT;
 617         }
 618
 619         rtc->regsize = resource_size(res);
 620
 621         rtc->res = devm_request_mem_region(&pdev->dev, res->start,
 622                                         rtc->regsize, pdev->name);
 623         if (unlikely(!rtc->res))
 624                 return -EBUSY;
 625
 626         rtc->regbase = devm_ioremap_nocache(&pdev->dev, rtc->res->start,
 627                                         rtc->regsize);
 628         if (unlikely(!rtc->regbase))
 629                 return -EINVAL;
 630
 631         clk_id = pdev->id;
 632         /* With a single device, the clock id is still "rtc0" */
 633         if (clk_id < 0)
 634                 clk_id = 0;
 635
 636         snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
 637
 638         rtc->clk = devm_clk_get(&pdev->dev, clk_name);
 639         if (IS_ERR(rtc->clk)) {
 640                 /*
 641                  * No error handling for rtc->clk intentionally, not all
 642                  * platforms will have a unique clock for the RTC, and
 643                  * the clk API can handle the struct clk pointer being
 644                  * NULL.
 645                  */
 646                 rtc->clk = NULL;
 647         }
 648
 649         clk_enable(rtc->clk);
 650
 651         rtc->capabilities = RTC_DEF_CAPABILITIES;
 652         if (pdev->dev.platform_data) {
 653                 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
 654
 655                 /*
 656                  * Some CPUs have special capabilities in addition to the
 657                  * default set. Add those in here.
 658                  */
 659                 rtc->capabilities |= pinfo->capabilities;
 660         }
 661
 662         if (rtc->carry_irq <= 0) {
 663                 /* register shared periodic/carry/alarm irq */
 664                 ret = devm_request_irq(&pdev->dev, rtc->periodic_irq,
 665                                 sh_rtc_shared, 0, "sh-rtc", rtc);
 666                 if (unlikely(ret)) {
 667                         dev_err(&pdev->dev,
 668                                 "request IRQ failed with %d, IRQ %d\n", ret,
 669                                 rtc->periodic_irq);
 670                         goto err_unmap;
 671                 }
 672         } else {
 673                 /* register periodic/carry/alarm irqs */
 674                 ret = devm_request_irq(&pdev->dev, rtc->periodic_irq,
 675                                 sh_rtc_periodic, 0, "sh-rtc period", rtc);
 676                 if (unlikely(ret)) {
 677                         dev_err(&pdev->dev,
 678                                 "request period IRQ failed with %d, IRQ %d\n",
 679                                 ret, rtc->periodic_irq);
 680                         goto err_unmap;
 681                 }
 682
 683                 ret = devm_request_irq(&pdev->dev, rtc->carry_irq,
 684                                 sh_rtc_interrupt, 0, "sh-rtc carry", rtc);
 685                 if (unlikely(ret)) {
 686                         dev_err(&pdev->dev,
 687                                 "request carry IRQ failed with %d, IRQ %d\n",
 688                                 ret, rtc->carry_irq);
 689                         goto err_unmap;
 690                 }
 691
 692                 ret = devm_request_irq(&pdev->dev, rtc->alarm_irq,
 693                                 sh_rtc_alarm, 0, "sh-rtc alarm", rtc);
 694                 if (unlikely(ret)) {
 695                         dev_err(&pdev->dev,
 696                                 "request alarm IRQ failed with %d, IRQ %d\n",
 697                                 ret, rtc->alarm_irq);
 698                         goto err_unmap;
 699                 }
 700         }
 701
 702         platform_set_drvdata(pdev, rtc);
 703
 704         /* everything disabled by default */
 705         sh_rtc_irq_set_freq(&pdev->dev, 0);
 706         sh_rtc_irq_set_state(&pdev->dev, 0);
 707         sh_rtc_setaie(&pdev->dev, 0);
 708         sh_rtc_setcie(&pdev->dev, 0);
 709
 710         rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "sh",
 711                                            &sh_rtc_ops, THIS_MODULE);
 712         if (IS_ERR(rtc->rtc_dev)) {
 713                 ret = PTR_ERR(rtc->rtc_dev);
 714                 goto err_unmap;
 715         }
 716
 717         rtc->rtc_dev->max_user_freq = 256;
 718
 719         /* reset rtc to epoch 0 if time is invalid */
 720         if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
 721                 rtc_time_to_tm(0, &r);
 722                 rtc_set_time(rtc->rtc_dev, &r);
 723         }
 724
 725         device_init_wakeup(&pdev->dev, 1);
 726         return 0;
 727
 728 err_unmap:
 729         clk_disable(rtc->clk);
 730
 731         return ret;
 732 }
 733
 734 static int __exit sh_rtc_remove(struct platform_device *pdev)
 735 {
 736         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 737
 738         sh_rtc_irq_set_state(&pdev->dev, 0);
 739
 740         sh_rtc_setaie(&pdev->dev, 0);
 741         sh_rtc_setcie(&pdev->dev, 0);
 742
 743         clk_disable(rtc->clk);
 744
 745         return 0;
 746 }
 747
 748 static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
 749 {
 750         struct platform_device *pdev = to_platform_device(dev);
 751         struct sh_rtc *rtc = platform_get_drvdata(pdev);
 752
 753         irq_set_irq_wake(rtc->periodic_irq, enabled);
 754
 755         if (rtc->carry_irq > 0) {
 756                 irq_set_irq_wake(rtc->carry_irq, enabled);
 757                 irq_set_irq_wake(rtc->alarm_irq, enabled);
 758         }
 759 }
 760
 761 #ifdef CONFIG_PM_SLEEP
 762 static int sh_rtc_suspend(struct device *dev)
 763 {
 764         if (device_may_wakeup(dev))
 765                 sh_rtc_set_irq_wake(dev, 1);
 766
 767         return 0;
 768 }
 769
 770 static int sh_rtc_resume(struct device *dev)
 771 {
 772         if (device_may_wakeup(dev))
 773                 sh_rtc_set_irq_wake(dev, 0);
 774
 775         return 0;
 776 }
 777 #endif
 778
 779 static SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume);
 780
 781 static struct platform_driver sh_rtc_platform_driver = {
 782         .driver         = {
 783                 .name   = DRV_NAME,
 784                 .owner  = THIS_MODULE,
 785                 .pm     = &sh_rtc_pm_ops,
 786         },
 787         .remove         = __exit_p(sh_rtc_remove),
 788 };
 789
 790 module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe);
 791
 792 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
 793 MODULE_VERSION(DRV_VERSION);
 794 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 795               "Jamie Lenehan <lenehan@twibble.org>, "
 796               "Angelo Castello <angelo.castello@st.com>");
 797 MODULE_LICENSE("GPL");
 798 MODULE_ALIAS("platform:" DRV_NAME);