drivers/rtc/rtc-omap.c

   1 /*
   2  * TI OMAP1 Real Time Clock interface for Linux
   3  *
   4  * Copyright (C) 2003 MontaVista Software, Inc.
   5  * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
   6  *
   7  * Copyright (C) 2006 David Brownell (new RTC framework)
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/ioport.h>
  19 #include <linux/delay.h>
  20 #include <linux/rtc.h>
  21 #include <linux/bcd.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/io.h>
  27
  28 /* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock
  29  * with century-range alarm matching, driven by the 32kHz clock.
  30  *
  31  * The main user-visible ways it differs from PC RTCs are by omitting
  32  * "don't care" alarm fields and sub-second periodic IRQs, and having
  33  * an autoadjust mechanism to calibrate to the true oscillator rate.
  34  *
  35  * Board-specific wiring options include using split power mode with
  36  * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset),
  37  * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from
  38  * low power modes) for OMAP1 boards (OMAP-L138 has this built into
  39  * the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment.
  40  */
  41
  42 #define DRIVER_NAME                     "omap_rtc"
  43
  44 #define OMAP_RTC_BASE                   0xfffb4800
  45
  46 /* RTC registers */
  47 #define OMAP_RTC_SECONDS_REG            0x00
  48 #define OMAP_RTC_MINUTES_REG            0x04
  49 #define OMAP_RTC_HOURS_REG              0x08
  50 #define OMAP_RTC_DAYS_REG               0x0C
  51 #define OMAP_RTC_MONTHS_REG             0x10
  52 #define OMAP_RTC_YEARS_REG              0x14
  53 #define OMAP_RTC_WEEKS_REG              0x18
  54
  55 #define OMAP_RTC_ALARM_SECONDS_REG      0x20
  56 #define OMAP_RTC_ALARM_MINUTES_REG      0x24
  57 #define OMAP_RTC_ALARM_HOURS_REG        0x28
  58 #define OMAP_RTC_ALARM_DAYS_REG         0x2c
  59 #define OMAP_RTC_ALARM_MONTHS_REG       0x30
  60 #define OMAP_RTC_ALARM_YEARS_REG        0x34
  61
  62 #define OMAP_RTC_CTRL_REG               0x40
  63 #define OMAP_RTC_STATUS_REG             0x44
  64 #define OMAP_RTC_INTERRUPTS_REG         0x48
  65
  66 #define OMAP_RTC_COMP_LSB_REG           0x4c
  67 #define OMAP_RTC_COMP_MSB_REG           0x50
  68 #define OMAP_RTC_OSC_REG                0x54
  69
  70 #define OMAP_RTC_KICK0_REG              0x6c
  71 #define OMAP_RTC_KICK1_REG              0x70
  72
  73 #define OMAP_RTC_IRQWAKEEN              0x7c
  74
  75 /* OMAP_RTC_CTRL_REG bit fields: */
  76 #define OMAP_RTC_CTRL_SPLIT             (1<<7)
  77 #define OMAP_RTC_CTRL_DISABLE           (1<<6)
  78 #define OMAP_RTC_CTRL_SET_32_COUNTER    (1<<5)
  79 #define OMAP_RTC_CTRL_TEST              (1<<4)
  80 #define OMAP_RTC_CTRL_MODE_12_24        (1<<3)
  81 #define OMAP_RTC_CTRL_AUTO_COMP         (1<<2)
  82 #define OMAP_RTC_CTRL_ROUND_30S         (1<<1)
  83 #define OMAP_RTC_CTRL_STOP              (1<<0)
  84
  85 /* OMAP_RTC_STATUS_REG bit fields: */
  86 #define OMAP_RTC_STATUS_POWER_UP        (1<<7)
  87 #define OMAP_RTC_STATUS_ALARM           (1<<6)
  88 #define OMAP_RTC_STATUS_1D_EVENT        (1<<5)
  89 #define OMAP_RTC_STATUS_1H_EVENT        (1<<4)
  90 #define OMAP_RTC_STATUS_1M_EVENT        (1<<3)
  91 #define OMAP_RTC_STATUS_1S_EVENT        (1<<2)
  92 #define OMAP_RTC_STATUS_RUN             (1<<1)
  93 #define OMAP_RTC_STATUS_BUSY            (1<<0)
  94
  95 /* OMAP_RTC_INTERRUPTS_REG bit fields: */
  96 #define OMAP_RTC_INTERRUPTS_IT_ALARM    (1<<3)
  97 #define OMAP_RTC_INTERRUPTS_IT_TIMER    (1<<2)
  98
  99 /* OMAP_RTC_IRQWAKEEN bit fields: */
 100 #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN    (1<<1)
 101
 102 /* OMAP_RTC_KICKER values */
 103 #define KICK0_VALUE                     0x83e70b13
 104 #define KICK1_VALUE                     0x95a4f1e0
 105
 106 #define OMAP_RTC_HAS_KICKER             0x1
 107
 108 /*
 109  * Few RTC IP revisions has special WAKE-EN Register to enable Wakeup
 110  * generation for event Alarm.
 111  */
 112 #define OMAP_RTC_HAS_IRQWAKEEN          0x2
 113
 114 static void __iomem     *rtc_base;
 115
 116 #define rtc_read(addr)          readb(rtc_base + (addr))
 117 #define rtc_write(val, addr)    writeb(val, rtc_base + (addr))
 118
 119 #define rtc_writel(val, addr)   writel(val, rtc_base + (addr))
 120
 121
 122 /* we rely on the rtc framework to handle locking (rtc->ops_lock),
 123  * so the only other requirement is that register accesses which
 124  * require BUSY to be clear are made with IRQs locally disabled
 125  */
 126 static void rtc_wait_not_busy(void)
 127 {
 128         int     count = 0;
 129         u8      status;
 130
 131         /* BUSY may stay active for 1/32768 second (~30 usec) */
 132         for (count = 0; count < 50; count++) {
 133                 status = rtc_read(OMAP_RTC_STATUS_REG);
 134                 if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0)
 135                         break;
 136                 udelay(1);
 137         }
 138         /* now we have ~15 usec to read/write various registers */
 139 }
 140
 141 static irqreturn_t rtc_irq(int irq, void *rtc)
 142 {
 143         unsigned long           events = 0;
 144         u8                      irq_data;
 145
 146         irq_data = rtc_read(OMAP_RTC_STATUS_REG);
 147
 148         /* alarm irq? */
 149         if (irq_data & OMAP_RTC_STATUS_ALARM) {
 150                 rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
 151                 events |= RTC_IRQF | RTC_AF;
 152         }
 153
 154         /* 1/sec periodic/update irq? */
 155         if (irq_data & OMAP_RTC_STATUS_1S_EVENT)
 156                 events |= RTC_IRQF | RTC_UF;
 157
 158         rtc_update_irq(rtc, 1, events);
 159
 160         return IRQ_HANDLED;
 161 }
 162
 163 static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 164 {
 165         u8 reg;
 166
 167         local_irq_disable();
 168         rtc_wait_not_busy();
 169         reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
 170         if (enabled)
 171                 reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
 172         else
 173                 reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
 174         rtc_wait_not_busy();
 175         rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
 176         local_irq_enable();
 177
 178         return 0;
 179 }
 180
 181 /* this hardware doesn't support "don't care" alarm fields */
 182 static int tm2bcd(struct rtc_time *tm)
 183 {
 184         if (rtc_valid_tm(tm) != 0)
 185                 return -EINVAL;
 186
 187         tm->tm_sec = bin2bcd(tm->tm_sec);
 188         tm->tm_min = bin2bcd(tm->tm_min);
 189         tm->tm_hour = bin2bcd(tm->tm_hour);
 190         tm->tm_mday = bin2bcd(tm->tm_mday);
 191
 192         tm->tm_mon = bin2bcd(tm->tm_mon + 1);
 193
 194         /* epoch == 1900 */
 195         if (tm->tm_year < 100 || tm->tm_year > 199)
 196                 return -EINVAL;
 197         tm->tm_year = bin2bcd(tm->tm_year - 100);
 198
 199         return 0;
 200 }
 201
 202 static void bcd2tm(struct rtc_time *tm)
 203 {
 204         tm->tm_sec = bcd2bin(tm->tm_sec);
 205         tm->tm_min = bcd2bin(tm->tm_min);
 206         tm->tm_hour = bcd2bin(tm->tm_hour);
 207         tm->tm_mday = bcd2bin(tm->tm_mday);
 208         tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
 209         /* epoch == 1900 */
 210         tm->tm_year = bcd2bin(tm->tm_year) + 100;
 211 }
 212
 213
 214 static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
 215 {
 216         /* we don't report wday/yday/isdst ... */
 217         local_irq_disable();
 218         rtc_wait_not_busy();
 219
 220         tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG);
 221         tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG);
 222         tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG);
 223         tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG);
 224         tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG);
 225         tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG);
 226
 227         local_irq_enable();
 228
 229         bcd2tm(tm);
 230         return 0;
 231 }
 232
 233 static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm)
 234 {
 235         if (tm2bcd(tm) < 0)
 236                 return -EINVAL;
 237         local_irq_disable();
 238         rtc_wait_not_busy();
 239
 240         rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG);
 241         rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG);
 242         rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG);
 243         rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG);
 244         rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG);
 245         rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG);
 246
 247         local_irq_enable();
 248
 249         return 0;
 250 }
 251
 252 static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 253 {
 254         local_irq_disable();
 255         rtc_wait_not_busy();
 256
 257         alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG);
 258         alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG);
 259         alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG);
 260         alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG);
 261         alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG);
 262         alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG);
 263
 264         local_irq_enable();
 265
 266         bcd2tm(&alm->time);
 267         alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG)
 268                         & OMAP_RTC_INTERRUPTS_IT_ALARM);
 269
 270         return 0;
 271 }
 272
 273 static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 274 {
 275         u8 reg;
 276
 277         if (tm2bcd(&alm->time) < 0)
 278                 return -EINVAL;
 279
 280         local_irq_disable();
 281         rtc_wait_not_busy();
 282
 283         rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG);
 284         rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG);
 285         rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG);
 286         rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG);
 287         rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG);
 288         rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG);
 289
 290         reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
 291         if (alm->enabled)
 292                 reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
 293         else
 294                 reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
 295         rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
 296
 297         local_irq_enable();
 298
 299         return 0;
 300 }
 301
 302 static struct rtc_class_ops omap_rtc_ops = {
 303         .read_time      = omap_rtc_read_time,
 304         .set_time       = omap_rtc_set_time,
 305         .read_alarm     = omap_rtc_read_alarm,
 306         .set_alarm      = omap_rtc_set_alarm,
 307         .alarm_irq_enable = omap_rtc_alarm_irq_enable,
 308 };
 309
 310 static int omap_rtc_alarm;
 311 static int omap_rtc_timer;
 312
 313 #define OMAP_RTC_DATA_AM3352_IDX        1
 314 #define OMAP_RTC_DATA_DA830_IDX         2
 315
 316 static struct platform_device_id omap_rtc_devtype[] = {
 317         {
 318                 .name   = DRIVER_NAME,
 319         },
 320         [OMAP_RTC_DATA_AM3352_IDX] = {
 321                 .name   = "am3352-rtc",
 322                 .driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN,
 323         },
 324         [OMAP_RTC_DATA_DA830_IDX] = {
 325                 .name   = "da830-rtc",
 326                 .driver_data = OMAP_RTC_HAS_KICKER,
 327         },
 328         {},
 329 };
 330 MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);
 331
 332 static const struct of_device_id omap_rtc_of_match[] = {
 333         {       .compatible     = "ti,da830-rtc",
 334                 .data           = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],
 335         },
 336         {       .compatible     = "ti,am3352-rtc",
 337                 .data           = &omap_rtc_devtype[OMAP_RTC_DATA_AM3352_IDX],
 338         },
 339         {},
 340 };
 341 MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
 342
 343 static int __init omap_rtc_probe(struct platform_device *pdev)
 344 {
 345         struct resource         *res;
 346         struct rtc_device       *rtc;
 347         u8                      reg, new_ctrl;
 348         const struct platform_device_id *id_entry;
 349         const struct of_device_id *of_id;
 350
 351         of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
 352         if (of_id)
 353                 pdev->id_entry = of_id->data;
 354
 355         omap_rtc_timer = platform_get_irq(pdev, 0);
 356         if (omap_rtc_timer <= 0) {
 357                 pr_debug("%s: no update irq?\n", pdev->name);
 358                 return -ENOENT;
 359         }
 360
 361         omap_rtc_alarm = platform_get_irq(pdev, 1);
 362         if (omap_rtc_alarm <= 0) {
 363                 pr_debug("%s: no alarm irq?\n", pdev->name);
 364                 return -ENOENT;
 365         }
 366
 367         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 368         rtc_base = devm_ioremap_resource(&pdev->dev, res);
 369         if (IS_ERR(rtc_base))
 370                 return PTR_ERR(rtc_base);
 371
 372         /* Enable the clock/module so that we can access the registers */
 373         pm_runtime_enable(&pdev->dev);
 374         pm_runtime_get_sync(&pdev->dev);
 375
 376         id_entry = platform_get_device_id(pdev);
 377         if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER)) {
 378                 rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG);
 379                 rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG);
 380         }
 381
 382         rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 383                         &omap_rtc_ops, THIS_MODULE);
 384         if (IS_ERR(rtc)) {
 385                 pr_debug("%s: can't register RTC device, err %ld\n",
 386                         pdev->name, PTR_ERR(rtc));
 387                 goto fail0;
 388         }
 389         platform_set_drvdata(pdev, rtc);
 390
 391         /* clear pending irqs, and set 1/second periodic,
 392          * which we'll use instead of update irqs
 393          */
 394         rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
 395
 396         /* clear old status */
 397         reg = rtc_read(OMAP_RTC_STATUS_REG);
 398         if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
 399                 pr_info("%s: RTC power up reset detected\n",
 400                         pdev->name);
 401                 rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG);
 402         }
 403         if (reg & (u8) OMAP_RTC_STATUS_ALARM)
 404                 rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
 405
 406         /* handle periodic and alarm irqs */
 407         if (devm_request_irq(&pdev->dev, omap_rtc_timer, rtc_irq, 0,
 408                         dev_name(&rtc->dev), rtc)) {
 409                 pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n",
 410                         pdev->name, omap_rtc_timer);
 411                 goto fail0;
 412         }
 413         if ((omap_rtc_timer != omap_rtc_alarm) &&
 414                 (devm_request_irq(&pdev->dev, omap_rtc_alarm, rtc_irq, 0,
 415                         dev_name(&rtc->dev), rtc))) {
 416                 pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n",
 417                         pdev->name, omap_rtc_alarm);
 418                 goto fail0;
 419         }
 420
 421         /* On boards with split power, RTC_ON_NOFF won't reset the RTC */
 422         reg = rtc_read(OMAP_RTC_CTRL_REG);
 423         if (reg & (u8) OMAP_RTC_CTRL_STOP)
 424                 pr_info("%s: already running\n", pdev->name);
 425
 426         /* force to 24 hour mode */
 427         new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
 428         new_ctrl |= OMAP_RTC_CTRL_STOP;
 429
 430         /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
 431          *
 432          *  - Device wake-up capability setting should come through chip
 433          *    init logic. OMAP1 boards should initialize the "wakeup capable"
 434          *    flag in the platform device if the board is wired right for
 435          *    being woken up by RTC alarm. For OMAP-L138, this capability
 436          *    is built into the SoC by the "Deep Sleep" capability.
 437          *
 438          *  - Boards wired so RTC_ON_nOFF is used as the reset signal,
 439          *    rather than nPWRON_RESET, should forcibly enable split
 440          *    power mode.  (Some chip errata report that RTC_CTRL_SPLIT
 441          *    is write-only, and always reads as zero...)
 442          */
 443
 444         device_init_wakeup(&pdev->dev, true);
 445
 446         if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
 447                 pr_info("%s: split power mode\n", pdev->name);
 448
 449         if (reg != new_ctrl)
 450                 rtc_write(new_ctrl, OMAP_RTC_CTRL_REG);
 451
 452         return 0;
 453
 454 fail0:
 455         if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
 456                 rtc_writel(0, OMAP_RTC_KICK0_REG);
 457         pm_runtime_put_sync(&pdev->dev);
 458         pm_runtime_disable(&pdev->dev);
 459         return -EIO;
 460 }
 461
 462 static int __exit omap_rtc_remove(struct platform_device *pdev)
 463 {
 464         const struct platform_device_id *id_entry =
 465                                 platform_get_device_id(pdev);
 466
 467         device_init_wakeup(&pdev->dev, 0);
 468
 469         /* leave rtc running, but disable irqs */
 470         rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
 471
 472         if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
 473                 rtc_writel(0, OMAP_RTC_KICK0_REG);
 474
 475         /* Disable the clock/module */
 476         pm_runtime_put_sync(&pdev->dev);
 477         pm_runtime_disable(&pdev->dev);
 478
 479         return 0;
 480 }
 481
 482 #ifdef CONFIG_PM_SLEEP
 483 static u8 irqstat;
 484
 485 static int omap_rtc_suspend(struct device *dev)
 486 {
 487         u8 irqwake_stat;
 488         struct platform_device *pdev = to_platform_device(dev);
 489         const struct platform_device_id *id_entry =
 490                                         platform_get_device_id(pdev);
 491
 492         irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG);
 493
 494         /* FIXME the RTC alarm is not currently acting as a wakeup event
 495          * source on some platforms, and in fact this enable() call is just
 496          * saving a flag that's never used...
 497          */
 498         if (device_may_wakeup(dev)) {
 499                 enable_irq_wake(omap_rtc_alarm);
 500
 501                 if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
 502                         irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
 503                         irqwake_stat |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
 504                         rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
 505                 }
 506         } else {
 507                 rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
 508         }
 509
 510         /* Disable the clock/module */
 511         pm_runtime_put_sync(dev);
 512
 513         return 0;
 514 }
 515
 516 static int omap_rtc_resume(struct device *dev)
 517 {
 518         u8 irqwake_stat;
 519         struct platform_device *pdev = to_platform_device(dev);
 520         const struct platform_device_id *id_entry =
 521                                 platform_get_device_id(pdev);
 522
 523         /* Enable the clock/module so that we can access the registers */
 524         pm_runtime_get_sync(dev);
 525
 526         if (device_may_wakeup(dev)) {
 527                 disable_irq_wake(omap_rtc_alarm);
 528
 529                 if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
 530                         irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
 531                         irqwake_stat &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
 532                         rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
 533                 }
 534         } else {
 535                 rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
 536         }
 537         return 0;
 538 }
 539 #endif
 540
 541 static SIMPLE_DEV_PM_OPS(omap_rtc_pm_ops, omap_rtc_suspend, omap_rtc_resume);
 542
 543 static void omap_rtc_shutdown(struct platform_device *pdev)
 544 {
 545         rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
 546 }
 547
 548 MODULE_ALIAS("platform:omap_rtc");
 549 static struct platform_driver omap_rtc_driver = {
 550         .remove         = __exit_p(omap_rtc_remove),
 551         .shutdown       = omap_rtc_shutdown,
 552         .driver         = {
 553                 .name   = DRIVER_NAME,
 554                 .owner  = THIS_MODULE,
 555                 .pm     = &omap_rtc_pm_ops,
 556                 .of_match_table = omap_rtc_of_match,
 557         },
 558         .id_table       = omap_rtc_devtype,
 559 };
 560
 561 module_platform_driver_probe(omap_rtc_driver, omap_rtc_probe);
 562
 563 MODULE_AUTHOR("George G. Davis (and others)");
 564 MODULE_LICENSE("GPL");