drivers/rtc/rtc-davinci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * DaVinci Power Management and Real Time Clock Driver for TI platforms
   4  *
   5  * Copyright (C) 2009 Texas Instruments, Inc
   6  *
   7  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/ioport.h>
  13 #include <linux/delay.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/rtc.h>
  16 #include <linux/bcd.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/slab.h>
  20
  21 /*
  22  * The DaVinci RTC is a simple RTC with the following
  23  * Sec: 0 - 59 : BCD count
  24  * Min: 0 - 59 : BCD count
  25  * Hour: 0 - 23 : BCD count
  26  * Day: 0 - 0x7FFF(32767) : Binary count ( Over 89 years )
  27  */
  28
  29 /* PRTC interface registers */
  30 #define DAVINCI_PRTCIF_PID              0x00
  31 #define PRTCIF_CTLR                     0x04
  32 #define PRTCIF_LDATA                    0x08
  33 #define PRTCIF_UDATA                    0x0C
  34 #define PRTCIF_INTEN                    0x10
  35 #define PRTCIF_INTFLG                   0x14
  36
  37 /* PRTCIF_CTLR bit fields */
  38 #define PRTCIF_CTLR_BUSY                BIT(31)
  39 #define PRTCIF_CTLR_SIZE                BIT(25)
  40 #define PRTCIF_CTLR_DIR                 BIT(24)
  41 #define PRTCIF_CTLR_BENU_MSB            BIT(23)
  42 #define PRTCIF_CTLR_BENU_3RD_BYTE       BIT(22)
  43 #define PRTCIF_CTLR_BENU_2ND_BYTE       BIT(21)
  44 #define PRTCIF_CTLR_BENU_LSB            BIT(20)
  45 #define PRTCIF_CTLR_BENU_MASK           (0x00F00000)
  46 #define PRTCIF_CTLR_BENL_MSB            BIT(19)
  47 #define PRTCIF_CTLR_BENL_3RD_BYTE       BIT(18)
  48 #define PRTCIF_CTLR_BENL_2ND_BYTE       BIT(17)
  49 #define PRTCIF_CTLR_BENL_LSB            BIT(16)
  50 #define PRTCIF_CTLR_BENL_MASK           (0x000F0000)
  51
  52 /* PRTCIF_INTEN bit fields */
  53 #define PRTCIF_INTEN_RTCSS              BIT(1)
  54 #define PRTCIF_INTEN_RTCIF              BIT(0)
  55 #define PRTCIF_INTEN_MASK               (PRTCIF_INTEN_RTCSS \
  56                                         | PRTCIF_INTEN_RTCIF)
  57
  58 /* PRTCIF_INTFLG bit fields */
  59 #define PRTCIF_INTFLG_RTCSS             BIT(1)
  60 #define PRTCIF_INTFLG_RTCIF             BIT(0)
  61 #define PRTCIF_INTFLG_MASK              (PRTCIF_INTFLG_RTCSS \
  62                                         | PRTCIF_INTFLG_RTCIF)
  63
  64 /* PRTC subsystem registers */
  65 #define PRTCSS_RTC_INTC_EXTENA1         (0x0C)
  66 #define PRTCSS_RTC_CTRL                 (0x10)
  67 #define PRTCSS_RTC_WDT                  (0x11)
  68 #define PRTCSS_RTC_TMR0                 (0x12)
  69 #define PRTCSS_RTC_TMR1                 (0x13)
  70 #define PRTCSS_RTC_CCTRL                (0x14)
  71 #define PRTCSS_RTC_SEC                  (0x15)
  72 #define PRTCSS_RTC_MIN                  (0x16)
  73 #define PRTCSS_RTC_HOUR                 (0x17)
  74 #define PRTCSS_RTC_DAY0                 (0x18)
  75 #define PRTCSS_RTC_DAY1                 (0x19)
  76 #define PRTCSS_RTC_AMIN                 (0x1A)
  77 #define PRTCSS_RTC_AHOUR                (0x1B)
  78 #define PRTCSS_RTC_ADAY0                (0x1C)
  79 #define PRTCSS_RTC_ADAY1                (0x1D)
  80 #define PRTCSS_RTC_CLKC_CNT             (0x20)
  81
  82 /* PRTCSS_RTC_INTC_EXTENA1 */
  83 #define PRTCSS_RTC_INTC_EXTENA1_MASK    (0x07)
  84
  85 /* PRTCSS_RTC_CTRL bit fields */
  86 #define PRTCSS_RTC_CTRL_WDTBUS          BIT(7)
  87 #define PRTCSS_RTC_CTRL_WEN             BIT(6)
  88 #define PRTCSS_RTC_CTRL_WDRT            BIT(5)
  89 #define PRTCSS_RTC_CTRL_WDTFLG          BIT(4)
  90 #define PRTCSS_RTC_CTRL_TE              BIT(3)
  91 #define PRTCSS_RTC_CTRL_TIEN            BIT(2)
  92 #define PRTCSS_RTC_CTRL_TMRFLG          BIT(1)
  93 #define PRTCSS_RTC_CTRL_TMMD            BIT(0)
  94
  95 /* PRTCSS_RTC_CCTRL bit fields */
  96 #define PRTCSS_RTC_CCTRL_CALBUSY        BIT(7)
  97 #define PRTCSS_RTC_CCTRL_DAEN           BIT(5)
  98 #define PRTCSS_RTC_CCTRL_HAEN           BIT(4)
  99 #define PRTCSS_RTC_CCTRL_MAEN           BIT(3)
 100 #define PRTCSS_RTC_CCTRL_ALMFLG         BIT(2)
 101 #define PRTCSS_RTC_CCTRL_AIEN           BIT(1)
 102 #define PRTCSS_RTC_CCTRL_CAEN           BIT(0)
 103
 104 static DEFINE_SPINLOCK(davinci_rtc_lock);
 105
 106 struct davinci_rtc {
 107         struct rtc_device               *rtc;
 108         void __iomem                    *base;
 109         int                             irq;
 110 };
 111
 112 static inline void rtcif_write(struct davinci_rtc *davinci_rtc,
 113                                u32 val, u32 addr)
 114 {
 115         writel(val, davinci_rtc->base + addr);
 116 }
 117
 118 static inline u32 rtcif_read(struct davinci_rtc *davinci_rtc, u32 addr)
 119 {
 120         return readl(davinci_rtc->base + addr);
 121 }
 122
 123 static inline void rtcif_wait(struct davinci_rtc *davinci_rtc)
 124 {
 125         while (rtcif_read(davinci_rtc, PRTCIF_CTLR) & PRTCIF_CTLR_BUSY)
 126                 cpu_relax();
 127 }
 128
 129 static inline void rtcss_write(struct davinci_rtc *davinci_rtc,
 130                                unsigned long val, u8 addr)
 131 {
 132         rtcif_wait(davinci_rtc);
 133
 134         rtcif_write(davinci_rtc, PRTCIF_CTLR_BENL_LSB | addr, PRTCIF_CTLR);
 135         rtcif_write(davinci_rtc, val, PRTCIF_LDATA);
 136
 137         rtcif_wait(davinci_rtc);
 138 }
 139
 140 static inline u8 rtcss_read(struct davinci_rtc *davinci_rtc, u8 addr)
 141 {
 142         rtcif_wait(davinci_rtc);
 143
 144         rtcif_write(davinci_rtc, PRTCIF_CTLR_DIR | PRTCIF_CTLR_BENL_LSB | addr,
 145                     PRTCIF_CTLR);
 146
 147         rtcif_wait(davinci_rtc);
 148
 149         return rtcif_read(davinci_rtc, PRTCIF_LDATA);
 150 }
 151
 152 static inline void davinci_rtcss_calendar_wait(struct davinci_rtc *davinci_rtc)
 153 {
 154         while (rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
 155                PRTCSS_RTC_CCTRL_CALBUSY)
 156                 cpu_relax();
 157 }
 158
 159 static irqreturn_t davinci_rtc_interrupt(int irq, void *class_dev)
 160 {
 161         struct davinci_rtc *davinci_rtc = class_dev;
 162         unsigned long events = 0;
 163         u32 irq_flg;
 164         u8 alm_irq, tmr_irq;
 165         u8 rtc_ctrl, rtc_cctrl;
 166         int ret = IRQ_NONE;
 167
 168         irq_flg = rtcif_read(davinci_rtc, PRTCIF_INTFLG) &
 169                   PRTCIF_INTFLG_RTCSS;
 170
 171         alm_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
 172                   PRTCSS_RTC_CCTRL_ALMFLG;
 173
 174         tmr_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL) &
 175                   PRTCSS_RTC_CTRL_TMRFLG;
 176
 177         if (irq_flg) {
 178                 if (alm_irq) {
 179                         events |= RTC_IRQF | RTC_AF;
 180                         rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
 181                         rtc_cctrl |=  PRTCSS_RTC_CCTRL_ALMFLG;
 182                         rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
 183                 } else if (tmr_irq) {
 184                         events |= RTC_IRQF | RTC_PF;
 185                         rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
 186                         rtc_ctrl |=  PRTCSS_RTC_CTRL_TMRFLG;
 187                         rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
 188                 }
 189
 190                 rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS,
 191                                     PRTCIF_INTFLG);
 192                 rtc_update_irq(davinci_rtc->rtc, 1, events);
 193
 194                 ret = IRQ_HANDLED;
 195         }
 196
 197         return ret;
 198 }
 199
 200 static int
 201 davinci_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 202 {
 203         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 204         u8 rtc_ctrl;
 205         unsigned long flags;
 206         int ret = 0;
 207
 208         spin_lock_irqsave(&davinci_rtc_lock, flags);
 209
 210         rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
 211
 212         switch (cmd) {
 213         case RTC_WIE_ON:
 214                 rtc_ctrl |= PRTCSS_RTC_CTRL_WEN | PRTCSS_RTC_CTRL_WDTFLG;
 215                 break;
 216         case RTC_WIE_OFF:
 217                 rtc_ctrl &= ~PRTCSS_RTC_CTRL_WEN;
 218                 break;
 219         default:
 220                 ret = -ENOIOCTLCMD;
 221         }
 222
 223         rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
 224
 225         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 226
 227         return ret;
 228 }
 229
 230 static int convertfromdays(u16 days, struct rtc_time *tm)
 231 {
 232         int tmp_days, year, mon;
 233
 234         for (year = 2000;; year++) {
 235                 tmp_days = rtc_year_days(1, 12, year);
 236                 if (days >= tmp_days)
 237                         days -= tmp_days;
 238                 else {
 239                         for (mon = 0;; mon++) {
 240                                 tmp_days = rtc_month_days(mon, year);
 241                                 if (days >= tmp_days) {
 242                                         days -= tmp_days;
 243                                 } else {
 244                                         tm->tm_year = year - 1900;
 245                                         tm->tm_mon = mon;
 246                                         tm->tm_mday = days + 1;
 247                                         break;
 248                                 }
 249                         }
 250                         break;
 251                 }
 252         }
 253         return 0;
 254 }
 255
 256 static int convert2days(u16 *days, struct rtc_time *tm)
 257 {
 258         int i;
 259         *days = 0;
 260
 261         /* epoch == 1900 */
 262         if (tm->tm_year < 100 || tm->tm_year > 199)
 263                 return -EINVAL;
 264
 265         for (i = 2000; i < 1900 + tm->tm_year; i++)
 266                 *days += rtc_year_days(1, 12, i);
 267
 268         *days += rtc_year_days(tm->tm_mday, tm->tm_mon, 1900 + tm->tm_year);
 269
 270         return 0;
 271 }
 272
 273 static int davinci_rtc_read_time(struct device *dev, struct rtc_time *tm)
 274 {
 275         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 276         u16 days = 0;
 277         u8 day0, day1;
 278         unsigned long flags;
 279
 280         spin_lock_irqsave(&davinci_rtc_lock, flags);
 281
 282         davinci_rtcss_calendar_wait(davinci_rtc);
 283         tm->tm_sec = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_SEC));
 284
 285         davinci_rtcss_calendar_wait(davinci_rtc);
 286         tm->tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_MIN));
 287
 288         davinci_rtcss_calendar_wait(davinci_rtc);
 289         tm->tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_HOUR));
 290
 291         davinci_rtcss_calendar_wait(davinci_rtc);
 292         day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY0);
 293
 294         davinci_rtcss_calendar_wait(davinci_rtc);
 295         day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY1);
 296
 297         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 298
 299         days |= day1;
 300         days <<= 8;
 301         days |= day0;
 302
 303         if (convertfromdays(days, tm) < 0)
 304                 return -EINVAL;
 305
 306         return 0;
 307 }
 308
 309 static int davinci_rtc_set_time(struct device *dev, struct rtc_time *tm)
 310 {
 311         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 312         u16 days;
 313         u8 rtc_cctrl;
 314         unsigned long flags;
 315
 316         if (convert2days(&days, tm) < 0)
 317                 return -EINVAL;
 318
 319         spin_lock_irqsave(&davinci_rtc_lock, flags);
 320
 321         davinci_rtcss_calendar_wait(davinci_rtc);
 322         rtcss_write(davinci_rtc, bin2bcd(tm->tm_sec), PRTCSS_RTC_SEC);
 323
 324         davinci_rtcss_calendar_wait(davinci_rtc);
 325         rtcss_write(davinci_rtc, bin2bcd(tm->tm_min), PRTCSS_RTC_MIN);
 326
 327         davinci_rtcss_calendar_wait(davinci_rtc);
 328         rtcss_write(davinci_rtc, bin2bcd(tm->tm_hour), PRTCSS_RTC_HOUR);
 329
 330         davinci_rtcss_calendar_wait(davinci_rtc);
 331         rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_DAY0);
 332
 333         davinci_rtcss_calendar_wait(davinci_rtc);
 334         rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_DAY1);
 335
 336         rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
 337         rtc_cctrl |= PRTCSS_RTC_CCTRL_CAEN;
 338         rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
 339
 340         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 341
 342         return 0;
 343 }
 344
 345 static int davinci_rtc_alarm_irq_enable(struct device *dev,
 346                                         unsigned int enabled)
 347 {
 348         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 349         unsigned long flags;
 350         u8 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
 351
 352         spin_lock_irqsave(&davinci_rtc_lock, flags);
 353
 354         if (enabled)
 355                 rtc_cctrl |= PRTCSS_RTC_CCTRL_DAEN |
 356                              PRTCSS_RTC_CCTRL_HAEN |
 357                              PRTCSS_RTC_CCTRL_MAEN |
 358                              PRTCSS_RTC_CCTRL_ALMFLG |
 359                              PRTCSS_RTC_CCTRL_AIEN;
 360         else
 361                 rtc_cctrl &= ~PRTCSS_RTC_CCTRL_AIEN;
 362
 363         davinci_rtcss_calendar_wait(davinci_rtc);
 364         rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
 365
 366         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 367
 368         return 0;
 369 }
 370
 371 static int davinci_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 372 {
 373         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 374         u16 days = 0;
 375         u8 day0, day1;
 376         unsigned long flags;
 377
 378         alm->time.tm_sec = 0;
 379
 380         spin_lock_irqsave(&davinci_rtc_lock, flags);
 381
 382         davinci_rtcss_calendar_wait(davinci_rtc);
 383         alm->time.tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AMIN));
 384
 385         davinci_rtcss_calendar_wait(davinci_rtc);
 386         alm->time.tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AHOUR));
 387
 388         davinci_rtcss_calendar_wait(davinci_rtc);
 389         day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY0);
 390
 391         davinci_rtcss_calendar_wait(davinci_rtc);
 392         day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY1);
 393
 394         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 395         days |= day1;
 396         days <<= 8;
 397         days |= day0;
 398
 399         if (convertfromdays(days, &alm->time) < 0)
 400                 return -EINVAL;
 401
 402         alm->pending = !!(rtcss_read(davinci_rtc,
 403                           PRTCSS_RTC_CCTRL) &
 404                         PRTCSS_RTC_CCTRL_AIEN);
 405         alm->enabled = alm->pending && device_may_wakeup(dev);
 406
 407         return 0;
 408 }
 409
 410 static int davinci_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 411 {
 412         struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
 413         unsigned long flags;
 414         u16 days;
 415
 416         if (alm->time.tm_mday <= 0 && alm->time.tm_mon < 0
 417             && alm->time.tm_year < 0) {
 418                 struct rtc_time tm;
 419                 unsigned long now, then;
 420
 421                 davinci_rtc_read_time(dev, &tm);
 422                 rtc_tm_to_time(&tm, &now);
 423
 424                 alm->time.tm_mday = tm.tm_mday;
 425                 alm->time.tm_mon = tm.tm_mon;
 426                 alm->time.tm_year = tm.tm_year;
 427                 rtc_tm_to_time(&alm->time, &then);
 428
 429                 if (then < now) {
 430                         rtc_time_to_tm(now + 24 * 60 * 60, &tm);
 431                         alm->time.tm_mday = tm.tm_mday;
 432                         alm->time.tm_mon = tm.tm_mon;
 433                         alm->time.tm_year = tm.tm_year;
 434                 }
 435         }
 436
 437         if (convert2days(&days, &alm->time) < 0)
 438                 return -EINVAL;
 439
 440         spin_lock_irqsave(&davinci_rtc_lock, flags);
 441
 442         davinci_rtcss_calendar_wait(davinci_rtc);
 443         rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_min), PRTCSS_RTC_AMIN);
 444
 445         davinci_rtcss_calendar_wait(davinci_rtc);
 446         rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_hour), PRTCSS_RTC_AHOUR);
 447
 448         davinci_rtcss_calendar_wait(davinci_rtc);
 449         rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_ADAY0);
 450
 451         davinci_rtcss_calendar_wait(davinci_rtc);
 452         rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_ADAY1);
 453
 454         spin_unlock_irqrestore(&davinci_rtc_lock, flags);
 455
 456         return 0;
 457 }
 458
 459 static const struct rtc_class_ops davinci_rtc_ops = {
 460         .ioctl                  = davinci_rtc_ioctl,
 461         .read_time              = davinci_rtc_read_time,
 462         .set_time               = davinci_rtc_set_time,
 463         .alarm_irq_enable       = davinci_rtc_alarm_irq_enable,
 464         .read_alarm             = davinci_rtc_read_alarm,
 465         .set_alarm              = davinci_rtc_set_alarm,
 466 };
 467
 468 static int __init davinci_rtc_probe(struct platform_device *pdev)
 469 {
 470         struct device *dev = &pdev->dev;
 471         struct davinci_rtc *davinci_rtc;
 472         int ret = 0;
 473
 474         davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc), GFP_KERNEL);
 475         if (!davinci_rtc)
 476                 return -ENOMEM;
 477
 478         davinci_rtc->irq = platform_get_irq(pdev, 0);
 479         if (davinci_rtc->irq < 0)
 480                 return davinci_rtc->irq;
 481
 482         davinci_rtc->base = devm_platform_ioremap_resource(pdev, 0);
 483         if (IS_ERR(davinci_rtc->base))
 484                 return PTR_ERR(davinci_rtc->base);
 485
 486         platform_set_drvdata(pdev, davinci_rtc);
 487
 488         davinci_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 489                                     &davinci_rtc_ops, THIS_MODULE);
 490         if (IS_ERR(davinci_rtc->rtc)) {
 491                 dev_err(dev, "unable to register RTC device, err %d\n",
 492                                 ret);
 493                 return PTR_ERR(davinci_rtc->rtc);
 494         }
 495
 496         rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
 497         rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
 498         rtcss_write(davinci_rtc, 0, PRTCSS_RTC_INTC_EXTENA1);
 499
 500         rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CTRL);
 501         rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CCTRL);
 502
 503         ret = devm_request_irq(dev, davinci_rtc->irq, davinci_rtc_interrupt,
 504                           0, "davinci_rtc", davinci_rtc);
 505         if (ret < 0) {
 506                 dev_err(dev, "unable to register davinci RTC interrupt\n");
 507                 return ret;
 508         }
 509
 510         /* Enable interrupts */
 511         rtcif_write(davinci_rtc, PRTCIF_INTEN_RTCSS, PRTCIF_INTEN);
 512         rtcss_write(davinci_rtc, PRTCSS_RTC_INTC_EXTENA1_MASK,
 513                             PRTCSS_RTC_INTC_EXTENA1);
 514
 515         rtcss_write(davinci_rtc, PRTCSS_RTC_CCTRL_CAEN, PRTCSS_RTC_CCTRL);
 516
 517         device_init_wakeup(&pdev->dev, 0);
 518
 519         return 0;
 520 }
 521
 522 static int __exit davinci_rtc_remove(struct platform_device *pdev)
 523 {
 524         struct davinci_rtc *davinci_rtc = platform_get_drvdata(pdev);
 525
 526         device_init_wakeup(&pdev->dev, 0);
 527
 528         rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
 529
 530         return 0;
 531 }
 532
 533 static struct platform_driver davinci_rtc_driver = {
 534         .remove         = __exit_p(davinci_rtc_remove),
 535         .driver         = {
 536                 .name = "rtc_davinci",
 537         },
 538 };
 539
 540 module_platform_driver_probe(davinci_rtc_driver, davinci_rtc_probe);
 541
 542 MODULE_AUTHOR("Miguel Aguilar <miguel.aguilar@ridgerun.com>");
 543 MODULE_DESCRIPTION("Texas Instruments DaVinci PRTC Driver");
 544 MODULE_LICENSE("GPL");