drivers/char/vr41xx_rtc.c

   1 /*
   2  *  Driver for NEC VR4100 series  Real Time Clock unit.
   3  *
   4  *  Copyright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/platform_device.h>
  21 #include <linux/fs.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/irq.h>
  25 #include <linux/mc146818rtc.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/module.h>
  28 #include <linux/poll.h>
  29 #include <linux/rtc.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/types.h>
  32 #include <linux/wait.h>
  33
  34 #include <asm/div64.h>
  35 #include <asm/io.h>
  36 #include <asm/time.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/vr41xx/vr41xx.h>
  39
  40 MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
  41 MODULE_DESCRIPTION("NEC VR4100 series RTC driver");
  42 MODULE_LICENSE("GPL");
  43
  44 #define RTC1_TYPE1_START        0x0b0000c0UL
  45 #define RTC1_TYPE1_END          0x0b0000dfUL
  46 #define RTC2_TYPE1_START        0x0b0001c0UL
  47 #define RTC2_TYPE1_END          0x0b0001dfUL
  48
  49 #define RTC1_TYPE2_START        0x0f000100UL
  50 #define RTC1_TYPE2_END          0x0f00011fUL
  51 #define RTC2_TYPE2_START        0x0f000120UL
  52 #define RTC2_TYPE2_END          0x0f00013fUL
  53
  54 #define RTC1_SIZE               0x20
  55 #define RTC2_SIZE               0x20
  56
  57 /* RTC 1 registers */
  58 #define ETIMELREG               0x00
  59 #define ETIMEMREG               0x02
  60 #define ETIMEHREG               0x04
  61 /* RFU */
  62 #define ECMPLREG                0x08
  63 #define ECMPMREG                0x0a
  64 #define ECMPHREG                0x0c
  65 /* RFU */
  66 #define RTCL1LREG               0x10
  67 #define RTCL1HREG               0x12
  68 #define RTCL1CNTLREG            0x14
  69 #define RTCL1CNTHREG            0x16
  70 #define RTCL2LREG               0x18
  71 #define RTCL2HREG               0x1a
  72 #define RTCL2CNTLREG            0x1c
  73 #define RTCL2CNTHREG            0x1e
  74
  75 /* RTC 2 registers */
  76 #define TCLKLREG                0x00
  77 #define TCLKHREG                0x02
  78 #define TCLKCNTLREG             0x04
  79 #define TCLKCNTHREG             0x06
  80 /* RFU */
  81 #define RTCINTREG               0x1e
  82  #define TCLOCK_INT             0x08
  83  #define RTCLONG2_INT           0x04
  84  #define RTCLONG1_INT           0x02
  85  #define ELAPSEDTIME_INT        0x01
  86
  87 #define RTC_FREQUENCY           32768
  88 #define MAX_PERIODIC_RATE       6553
  89 #define MAX_USER_PERIODIC_RATE  64
  90
  91 static void __iomem *rtc1_base;
  92 static void __iomem *rtc2_base;
  93
  94 #define rtc1_read(offset)               readw(rtc1_base + (offset))
  95 #define rtc1_write(offset, value)       writew((value), rtc1_base + (offset))
  96
  97 #define rtc2_read(offset)               readw(rtc2_base + (offset))
  98 #define rtc2_write(offset, value)       writew((value), rtc2_base + (offset))
  99
 100 static unsigned long epoch = 1970;      /* Jan 1 1970 00:00:00 */
 101
 102 static spinlock_t rtc_task_lock;
 103 static wait_queue_head_t rtc_wait;
 104 static unsigned long rtc_irq_data;
 105 static struct fasync_struct *rtc_async_queue;
 106 static rtc_task_t *rtc_callback;
 107 static char rtc_name[] = "RTC";
 108 static unsigned long periodic_frequency;
 109 static unsigned long periodic_count;
 110
 111 typedef enum {
 112         RTC_RELEASE,
 113         RTC_OPEN,
 114 } rtc_status_t;
 115
 116 static rtc_status_t rtc_status;
 117
 118 typedef enum {
 119         FUNCTION_RTC_IOCTL,
 120         FUNCTION_RTC_CONTROL,
 121 } rtc_callfrom_t;
 122
 123 struct resource rtc_resource[2] = {
 124         {       .name   = rtc_name,
 125                 .flags  = IORESOURCE_MEM,       },
 126         {       .name   = rtc_name,
 127                 .flags  = IORESOURCE_MEM,       },
 128 };
 129
 130 static inline unsigned long read_elapsed_second(void)
 131 {
 132         unsigned long first_low, first_mid, first_high;
 133         unsigned long second_low, second_mid, second_high;
 134
 135         do {
 136                 first_low = rtc1_read(ETIMELREG);
 137                 first_mid = rtc1_read(ETIMEMREG);
 138                 first_high = rtc1_read(ETIMEHREG);
 139                 second_low = rtc1_read(ETIMELREG);
 140                 second_mid = rtc1_read(ETIMEMREG);
 141                 second_high = rtc1_read(ETIMEHREG);
 142         } while (first_low != second_low || first_mid != second_mid ||
 143                  first_high != second_high);
 144
 145         return (first_high << 17) | (first_mid << 1) | (first_low >> 15);
 146 }
 147
 148 static inline void write_elapsed_second(unsigned long sec)
 149 {
 150         spin_lock_irq(&rtc_lock);
 151
 152         rtc1_write(ETIMELREG, (uint16_t)(sec << 15));
 153         rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1));
 154         rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17));
 155
 156         spin_unlock_irq(&rtc_lock);
 157 }
 158
 159 static void set_alarm(struct rtc_time *time)
 160 {
 161         unsigned long alarm_sec;
 162
 163         alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 164                            time->tm_hour, time->tm_min, time->tm_sec);
 165
 166         spin_lock_irq(&rtc_lock);
 167
 168         rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
 169         rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
 170         rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
 171
 172         spin_unlock_irq(&rtc_lock);
 173 }
 174
 175 static void read_alarm(struct rtc_time *time)
 176 {
 177         unsigned long low, mid, high;
 178
 179         spin_lock_irq(&rtc_lock);
 180
 181         low = rtc1_read(ECMPLREG);
 182         mid = rtc1_read(ECMPMREG);
 183         high = rtc1_read(ECMPHREG);
 184
 185         spin_unlock_irq(&rtc_lock);
 186
 187         to_tm((high << 17) | (mid << 1) | (low >> 15), time);
 188         time->tm_year -= 1900;
 189 }
 190
 191 static void read_time(struct rtc_time *time)
 192 {
 193         unsigned long epoch_sec, elapsed_sec;
 194
 195         epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 196         elapsed_sec = read_elapsed_second();
 197
 198         to_tm(epoch_sec + elapsed_sec, time);
 199         time->tm_year -= 1900;
 200 }
 201
 202 static void set_time(struct rtc_time *time)
 203 {
 204         unsigned long epoch_sec, current_sec;
 205
 206         epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 207         current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 208                              time->tm_hour, time->tm_min, time->tm_sec);
 209
 210         write_elapsed_second(current_sec - epoch_sec);
 211 }
 212
 213 static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 214 {
 215         DECLARE_WAITQUEUE(wait, current);
 216         unsigned long irq_data;
 217         int retval = 0;
 218
 219         if (count != sizeof(unsigned int) && count != sizeof(unsigned long))
 220                 return -EINVAL;
 221
 222         add_wait_queue(&rtc_wait, &wait);
 223
 224         do {
 225                 __set_current_state(TASK_INTERRUPTIBLE);
 226
 227                 spin_lock_irq(&rtc_lock);
 228                 irq_data = rtc_irq_data;
 229                 rtc_irq_data = 0;
 230                 spin_unlock_irq(&rtc_lock);
 231
 232                 if (irq_data != 0)
 233                         break;
 234
 235                 if (file->f_flags & O_NONBLOCK) {
 236                         retval = -EAGAIN;
 237                         break;
 238                 }
 239
 240                 if (signal_pending(current)) {
 241                         retval = -ERESTARTSYS;
 242                         break;
 243                 }
 244         } while (1);
 245
 246         if (retval == 0) {
 247                 if (count == sizeof(unsigned int)) {
 248                         retval = put_user(irq_data, (unsigned int __user *)buf);
 249                         if (retval == 0)
 250                                 retval = sizeof(unsigned int);
 251                 } else {
 252                         retval = put_user(irq_data, (unsigned long __user *)buf);
 253                         if (retval == 0)
 254                                 retval = sizeof(unsigned long);
 255                 }
 256
 257         }
 258
 259         __set_current_state(TASK_RUNNING);
 260         remove_wait_queue(&rtc_wait, &wait);
 261
 262         return retval;
 263 }
 264
 265 static unsigned int rtc_poll(struct file *file, struct poll_table_struct *table)
 266 {
 267         poll_wait(file, &rtc_wait, table);
 268
 269         if (rtc_irq_data != 0)
 270                 return POLLIN | POLLRDNORM;
 271
 272         return 0;
 273 }
 274
 275 static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, rtc_callfrom_t from)
 276 {
 277         struct rtc_time time;
 278         unsigned long count;
 279
 280         switch (cmd) {
 281         case RTC_AIE_ON:
 282                 enable_irq(ELAPSEDTIME_IRQ);
 283                 break;
 284         case RTC_AIE_OFF:
 285                 disable_irq(ELAPSEDTIME_IRQ);
 286                 break;
 287         case RTC_PIE_ON:
 288                 enable_irq(RTCLONG1_IRQ);
 289                 break;
 290         case RTC_PIE_OFF:
 291                 disable_irq(RTCLONG1_IRQ);
 292                 break;
 293         case RTC_ALM_SET:
 294                 if (copy_from_user(&time, (struct rtc_time __user *)arg,
 295                                    sizeof(struct rtc_time)))
 296                         return -EFAULT;
 297
 298                 set_alarm(&time);
 299                 break;
 300         case RTC_ALM_READ:
 301                 memset(&time, 0, sizeof(struct rtc_time));
 302                 read_alarm(&time);
 303                 break;
 304         case RTC_RD_TIME:
 305                 memset(&time, 0, sizeof(struct rtc_time));
 306                 read_time(&time);
 307                 if (copy_to_user((void __user *)arg, &time, sizeof(struct rtc_time)))
 308                         return -EFAULT;
 309                 break;
 310         case RTC_SET_TIME:
 311                 if (capable(CAP_SYS_TIME) == 0)
 312                         return -EACCES;
 313
 314                 if (copy_from_user(&time, (struct rtc_time __user *)arg,
 315                                    sizeof(struct rtc_time)))
 316                         return -EFAULT;
 317
 318                 set_time(&time);
 319                 break;
 320         case RTC_IRQP_READ:
 321                 return put_user(periodic_frequency, (unsigned long __user *)arg);
 322                 break;
 323         case RTC_IRQP_SET:
 324                 if (arg > MAX_PERIODIC_RATE)
 325                         return -EINVAL;
 326
 327                 if (from == FUNCTION_RTC_IOCTL && arg > MAX_USER_PERIODIC_RATE &&
 328                     capable(CAP_SYS_RESOURCE) == 0)
 329                         return -EACCES;
 330
 331                 periodic_frequency = arg;
 332
 333                 count = RTC_FREQUENCY;
 334                 do_div(count, arg);
 335
 336                 periodic_count = count;
 337
 338                 spin_lock_irq(&rtc_lock);
 339
 340                 rtc1_write(RTCL1LREG, count);
 341                 rtc1_write(RTCL1HREG, count >> 16);
 342
 343                 spin_unlock_irq(&rtc_lock);
 344                 break;
 345         case RTC_EPOCH_READ:
 346                 return put_user(epoch, (unsigned long __user *)arg);
 347         case RTC_EPOCH_SET:
 348                 /* Doesn't support before 1900 */
 349                 if (arg < 1900)
 350                         return -EINVAL;
 351
 352                 if (capable(CAP_SYS_TIME) == 0)
 353                         return -EACCES;
 354
 355                 epoch = arg;
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 365                      unsigned long arg)
 366 {
 367         return rtc_do_ioctl(cmd, arg, FUNCTION_RTC_IOCTL);
 368 }
 369
 370 static int rtc_open(struct inode *inode, struct file *file)
 371 {
 372         spin_lock_irq(&rtc_lock);
 373
 374         if (rtc_status == RTC_OPEN) {
 375                 spin_unlock_irq(&rtc_lock);
 376                 return -EBUSY;
 377         }
 378
 379         rtc_status = RTC_OPEN;
 380         rtc_irq_data = 0;
 381
 382         spin_unlock_irq(&rtc_lock);
 383
 384         return 0;
 385 }
 386
 387 static int rtc_release(struct inode *inode, struct file *file)
 388 {
 389         if (file->f_flags & FASYNC)
 390                 (void)fasync_helper(-1, file, 0, &rtc_async_queue);
 391
 392         spin_lock_irq(&rtc_lock);
 393
 394         rtc1_write(ECMPLREG, 0);
 395         rtc1_write(ECMPMREG, 0);
 396         rtc1_write(ECMPHREG, 0);
 397         rtc1_write(RTCL1LREG, 0);
 398         rtc1_write(RTCL1HREG, 0);
 399
 400         rtc_status = RTC_RELEASE;
 401
 402         spin_unlock_irq(&rtc_lock);
 403
 404         disable_irq(ELAPSEDTIME_IRQ);
 405         disable_irq(RTCLONG1_IRQ);
 406
 407         return 0;
 408 }
 409
 410 static int rtc_fasync(int fd, struct file *file, int on)
 411 {
 412         return fasync_helper(fd, file, on, &rtc_async_queue);
 413 }
 414
 415 static struct file_operations rtc_fops = {
 416         .owner          = THIS_MODULE,
 417         .llseek         = no_llseek,
 418         .read           = rtc_read,
 419         .poll           = rtc_poll,
 420         .ioctl          = rtc_ioctl,
 421         .open           = rtc_open,
 422         .release        = rtc_release,
 423         .fasync         = rtc_fasync,
 424 };
 425
 426 static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 427 {
 428         spin_lock(&rtc_lock);
 429         rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
 430
 431         rtc_irq_data += 0x100;
 432         rtc_irq_data &= ~0xff;
 433         rtc_irq_data |= RTC_AF;
 434         spin_unlock(&rtc_lock);
 435
 436         spin_lock(&rtc_lock);
 437         if (rtc_callback)
 438                 rtc_callback->func(rtc_callback->private_data);
 439         spin_unlock(&rtc_lock);
 440
 441         wake_up_interruptible(&rtc_wait);
 442
 443         kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
 444
 445         return IRQ_HANDLED;
 446 }
 447
 448 static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 449 {
 450         unsigned long count = periodic_count;
 451
 452         spin_lock(&rtc_lock);
 453         rtc2_write(RTCINTREG, RTCLONG1_INT);
 454
 455         rtc1_write(RTCL1LREG, count);
 456         rtc1_write(RTCL1HREG, count >> 16);
 457
 458         rtc_irq_data += 0x100;
 459         rtc_irq_data &= ~0xff;
 460         rtc_irq_data |= RTC_PF;
 461         spin_unlock(&rtc_lock);
 462
 463         spin_lock(&rtc_task_lock);
 464         if (rtc_callback)
 465                 rtc_callback->func(rtc_callback->private_data);
 466         spin_unlock(&rtc_task_lock);
 467
 468         wake_up_interruptible(&rtc_wait);
 469
 470         kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
 471
 472         return IRQ_HANDLED;
 473 }
 474
 475 int rtc_register(rtc_task_t *task)
 476 {
 477         if (task == NULL || task->func == NULL)
 478                 return -EINVAL;
 479
 480         spin_lock_irq(&rtc_lock);
 481         if (rtc_status == RTC_OPEN) {
 482                 spin_unlock_irq(&rtc_lock);
 483                 return -EBUSY;
 484         }
 485
 486         spin_lock(&rtc_task_lock);
 487         if (rtc_callback != NULL) {
 488                 spin_unlock(&rtc_task_lock);
 489                 spin_unlock_irq(&rtc_task_lock);
 490                 return -EBUSY;
 491         }
 492
 493         rtc_callback = task;
 494         spin_unlock(&rtc_task_lock);
 495
 496         rtc_status = RTC_OPEN;
 497
 498         spin_unlock_irq(&rtc_lock);
 499
 500         return 0;
 501 }
 502
 503 EXPORT_SYMBOL_GPL(rtc_register);
 504
 505 int rtc_unregister(rtc_task_t *task)
 506 {
 507         spin_lock_irq(&rtc_task_lock);
 508         if (task == NULL || rtc_callback != task) {
 509                 spin_unlock_irq(&rtc_task_lock);
 510                 return -ENXIO;
 511         }
 512
 513         spin_lock(&rtc_lock);
 514
 515         rtc1_write(ECMPLREG, 0);
 516         rtc1_write(ECMPMREG, 0);
 517         rtc1_write(ECMPHREG, 0);
 518         rtc1_write(RTCL1LREG, 0);
 519         rtc1_write(RTCL1HREG, 0);
 520
 521         rtc_status = RTC_RELEASE;
 522
 523         spin_unlock(&rtc_lock);
 524
 525         rtc_callback = NULL;
 526
 527         spin_unlock_irq(&rtc_task_lock);
 528
 529         disable_irq(ELAPSEDTIME_IRQ);
 530         disable_irq(RTCLONG1_IRQ);
 531
 532         return 0;
 533 }
 534
 535 EXPORT_SYMBOL_GPL(rtc_unregister);
 536
 537 int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
 538 {
 539         int retval = 0;
 540
 541         spin_lock_irq(&rtc_task_lock);
 542
 543         if (rtc_callback != task)
 544                 retval = -ENXIO;
 545         else
 546                 rtc_do_ioctl(cmd, arg, FUNCTION_RTC_CONTROL);
 547
 548         spin_unlock_irq(&rtc_task_lock);
 549
 550         return retval;
 551 }
 552
 553 EXPORT_SYMBOL_GPL(rtc_control);
 554
 555 static struct miscdevice rtc_miscdevice = {
 556         .minor  = RTC_MINOR,
 557         .name   = rtc_name,
 558         .fops   = &rtc_fops,
 559 };
 560
 561 static int rtc_probe(struct platform_device *pdev)
 562 {
 563         unsigned int irq;
 564         int retval;
 565
 566         if (pdev->num_resources != 2)
 567                 return -EBUSY;
 568
 569         rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE);
 570         if (rtc1_base == NULL)
 571                 return -EBUSY;
 572
 573         rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE);
 574         if (rtc2_base == NULL) {
 575                 iounmap(rtc1_base);
 576                 rtc1_base = NULL;
 577                 return -EBUSY;
 578         }
 579
 580         retval = misc_register(&rtc_miscdevice);
 581         if (retval < 0) {
 582                 iounmap(rtc1_base);
 583                 iounmap(rtc2_base);
 584                 rtc1_base = NULL;
 585                 rtc2_base = NULL;
 586                 return retval;
 587         }
 588
 589         spin_lock_irq(&rtc_lock);
 590
 591         rtc1_write(ECMPLREG, 0);
 592         rtc1_write(ECMPMREG, 0);
 593         rtc1_write(ECMPHREG, 0);
 594         rtc1_write(RTCL1LREG, 0);
 595         rtc1_write(RTCL1HREG, 0);
 596
 597         rtc_status = RTC_RELEASE;
 598         rtc_irq_data = 0;
 599
 600         spin_unlock_irq(&rtc_lock);
 601
 602         init_waitqueue_head(&rtc_wait);
 603
 604         irq = ELAPSEDTIME_IRQ;
 605         retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT,
 606                              "elapsed_time", NULL);
 607         if (retval == 0) {
 608                 irq = RTCLONG1_IRQ;
 609                 retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT,
 610                                      "rtclong1", NULL);
 611         }
 612
 613         if (retval < 0) {
 614                 printk(KERN_ERR "rtc: IRQ%d is busy\n", irq);
 615                 if (irq == RTCLONG1_IRQ)
 616                         free_irq(ELAPSEDTIME_IRQ, NULL);
 617                 iounmap(rtc1_base);
 618                 iounmap(rtc2_base);
 619                 rtc1_base = NULL;
 620                 rtc2_base = NULL;
 621                 return retval;
 622         }
 623
 624         disable_irq(ELAPSEDTIME_IRQ);
 625         disable_irq(RTCLONG1_IRQ);
 626
 627         spin_lock_init(&rtc_task_lock);
 628
 629         printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");
 630
 631         return 0;
 632 }
 633
 634 static int rtc_remove(struct platform_device *dev)
 635 {
 636         int retval;
 637
 638         retval = misc_deregister(&rtc_miscdevice);
 639         if (retval < 0)
 640                 return retval;
 641
 642         free_irq(ELAPSEDTIME_IRQ, NULL);
 643         free_irq(RTCLONG1_IRQ, NULL);
 644         if (rtc1_base != NULL)
 645                 iounmap(rtc1_base);
 646         if (rtc2_base != NULL)
 647                 iounmap(rtc2_base);
 648
 649         return 0;
 650 }
 651
 652 static struct platform_device *rtc_platform_device;
 653
 654 static struct platform_driver rtc_device_driver = {
 655         .probe          = rtc_probe,
 656         .remove         = rtc_remove,
 657         .driver         = {
 658                 .name   = rtc_name,
 659         },
 660 };
 661
 662 static int __devinit vr41xx_rtc_init(void)
 663 {
 664         int retval;
 665
 666         switch (current_cpu_data.cputype) {
 667         case CPU_VR4111:
 668         case CPU_VR4121:
 669                 rtc_resource[0].start = RTC1_TYPE1_START;
 670                 rtc_resource[0].end = RTC1_TYPE1_END;
 671                 rtc_resource[1].start = RTC2_TYPE1_START;
 672                 rtc_resource[1].end = RTC2_TYPE1_END;
 673                 break;
 674         case CPU_VR4122:
 675         case CPU_VR4131:
 676         case CPU_VR4133:
 677                 rtc_resource[0].start = RTC1_TYPE2_START;
 678                 rtc_resource[0].end = RTC1_TYPE2_END;
 679                 rtc_resource[1].start = RTC2_TYPE2_START;
 680                 rtc_resource[1].end = RTC2_TYPE2_END;
 681                 break;
 682         default:
 683                 return -ENODEV;
 684                 break;
 685         }
 686
 687         rtc_platform_device = platform_device_register_simple("RTC", -1,
 688                               rtc_resource, ARRAY_SIZE(rtc_resource));
 689         if (IS_ERR(rtc_platform_device))
 690                 return PTR_ERR(rtc_platform_device);
 691
 692         retval = platform_driver_register(&rtc_device_driver);
 693         if (retval < 0)
 694                 platform_device_unregister(rtc_platform_device);
 695
 696         return retval;
 697 }
 698
 699 static void __devexit vr41xx_rtc_exit(void)
 700 {
 701         platform_driver_unregister(&rtc_device_driver);
 702
 703         platform_device_unregister(rtc_platform_device);
 704 }
 705
 706 module_init(vr41xx_rtc_init);
 707 module_exit(vr41xx_rtc_exit);