drivers/char/vr41xx_rtc.c

   1 /*
   2  *  Driver for NEC VR4100 series  Real Time Clock unit.
   3  *
   4  *  Copyright (C) 2003-2005  Yoichi Yuasa <yuasa@hh.iij4u.or.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/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 <yuasa@hh.iij4u.or.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 #define RTC_NUM_RESOURCES       sizeof(rtc_resource) / sizeof(struct resource)
 131
 132 static inline unsigned long read_elapsed_second(void)
 133 {
 134         unsigned long first_low, first_mid, first_high;
 135         unsigned long second_low, second_mid, second_high;
 136
 137         do {
 138                 first_low = rtc1_read(ETIMELREG);
 139                 first_mid = rtc1_read(ETIMEMREG);
 140                 first_high = rtc1_read(ETIMEHREG);
 141                 second_low = rtc1_read(ETIMELREG);
 142                 second_mid = rtc1_read(ETIMEMREG);
 143                 second_high = rtc1_read(ETIMEHREG);
 144         } while (first_low != second_low || first_mid != second_mid ||
 145                  first_high != second_high);
 146
 147         return (first_high << 17) | (first_mid << 1) | (first_low >> 15);
 148 }
 149
 150 static inline void write_elapsed_second(unsigned long sec)
 151 {
 152         spin_lock_irq(&rtc_lock);
 153
 154         rtc1_write(ETIMELREG, (uint16_t)(sec << 15));
 155         rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1));
 156         rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17));
 157
 158         spin_unlock_irq(&rtc_lock);
 159 }
 160
 161 static void set_alarm(struct rtc_time *time)
 162 {
 163         unsigned long alarm_sec;
 164
 165         alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 166                            time->tm_hour, time->tm_min, time->tm_sec);
 167
 168         spin_lock_irq(&rtc_lock);
 169
 170         rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
 171         rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
 172         rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
 173
 174         spin_unlock_irq(&rtc_lock);
 175 }
 176
 177 static void read_alarm(struct rtc_time *time)
 178 {
 179         unsigned long low, mid, high;
 180
 181         spin_lock_irq(&rtc_lock);
 182
 183         low = rtc1_read(ECMPLREG);
 184         mid = rtc1_read(ECMPMREG);
 185         high = rtc1_read(ECMPHREG);
 186
 187         spin_unlock_irq(&rtc_lock);
 188
 189         to_tm((high << 17) | (mid << 1) | (low >> 15), time);
 190         time->tm_year -= 1900;
 191 }
 192
 193 static void read_time(struct rtc_time *time)
 194 {
 195         unsigned long epoch_sec, elapsed_sec;
 196
 197         epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 198         elapsed_sec = read_elapsed_second();
 199
 200         to_tm(epoch_sec + elapsed_sec, time);
 201         time->tm_year -= 1900;
 202 }
 203
 204 static void set_time(struct rtc_time *time)
 205 {
 206         unsigned long epoch_sec, current_sec;
 207
 208         epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 209         current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 210                              time->tm_hour, time->tm_min, time->tm_sec);
 211
 212         write_elapsed_second(current_sec - epoch_sec);
 213 }
 214
 215 static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 216 {
 217         DECLARE_WAITQUEUE(wait, current);
 218         unsigned long irq_data;
 219         int retval = 0;
 220
 221         if (count != sizeof(unsigned int) && count != sizeof(unsigned long))
 222                 return -EINVAL;
 223
 224         add_wait_queue(&rtc_wait, &wait);
 225
 226         do {
 227                 __set_current_state(TASK_INTERRUPTIBLE);
 228
 229                 spin_lock_irq(&rtc_lock);
 230                 irq_data = rtc_irq_data;
 231                 rtc_irq_data = 0;
 232                 spin_unlock_irq(&rtc_lock);
 233
 234                 if (irq_data != 0)
 235                         break;
 236
 237                 if (file->f_flags & O_NONBLOCK) {
 238                         retval = -EAGAIN;
 239                         break;
 240                 }
 241
 242                 if (signal_pending(current)) {
 243                         retval = -ERESTARTSYS;
 244                         break;
 245                 }
 246         } while (1);
 247
 248         if (retval == 0) {
 249                 if (count == sizeof(unsigned int)) {
 250                         retval = put_user(irq_data, (unsigned int __user *)buf);
 251                         if (retval == 0)
 252                                 retval = sizeof(unsigned int);
 253                 } else {
 254                         retval = put_user(irq_data, (unsigned long __user *)buf);
 255                         if (retval == 0)
 256                                 retval = sizeof(unsigned long);
 257                 }
 258
 259         }
 260
 261         __set_current_state(TASK_RUNNING);
 262         remove_wait_queue(&rtc_wait, &wait);
 263
 264         return retval;
 265 }
 266
 267 static unsigned int rtc_poll(struct file *file, struct poll_table_struct *table)
 268 {
 269         poll_wait(file, &rtc_wait, table);
 270
 271         if (rtc_irq_data != 0)
 272                 return POLLIN | POLLRDNORM;
 273
 274         return 0;
 275 }
 276
 277 static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, rtc_callfrom_t from)
 278 {
 279         struct rtc_time time;
 280         unsigned long count;
 281
 282         switch (cmd) {
 283         case RTC_AIE_ON:
 284                 enable_irq(ELAPSEDTIME_IRQ);
 285                 break;
 286         case RTC_AIE_OFF:
 287                 disable_irq(ELAPSEDTIME_IRQ);
 288                 break;
 289         case RTC_PIE_ON:
 290                 enable_irq(RTCLONG1_IRQ);
 291                 break;
 292         case RTC_PIE_OFF:
 293                 disable_irq(RTCLONG1_IRQ);
 294                 break;
 295         case RTC_ALM_SET:
 296                 if (copy_from_user(&time, (struct rtc_time __user *)arg,
 297                                    sizeof(struct rtc_time)))
 298                         return -EFAULT;
 299
 300                 set_alarm(&time);
 301                 break;
 302         case RTC_ALM_READ:
 303                 memset(&time, 0, sizeof(struct rtc_time));
 304                 read_alarm(&time);
 305                 break;
 306         case RTC_RD_TIME:
 307                 memset(&time, 0, sizeof(struct rtc_time));
 308                 read_time(&time);
 309                 if (copy_to_user((void __user *)arg, &time, sizeof(struct rtc_time)))
 310                         return -EFAULT;
 311                 break;
 312         case RTC_SET_TIME:
 313                 if (capable(CAP_SYS_TIME) == 0)
 314                         return -EACCES;
 315
 316                 if (copy_from_user(&time, (struct rtc_time __user *)arg,
 317                                    sizeof(struct rtc_time)))
 318                         return -EFAULT;
 319
 320                 set_time(&time);
 321                 break;
 322         case RTC_IRQP_READ:
 323                 return put_user(periodic_frequency, (unsigned long __user *)arg);
 324                 break;
 325         case RTC_IRQP_SET:
 326                 if (arg > MAX_PERIODIC_RATE)
 327                         return -EINVAL;
 328
 329                 if (from == FUNCTION_RTC_IOCTL && arg > MAX_USER_PERIODIC_RATE &&
 330                     capable(CAP_SYS_RESOURCE) == 0)
 331                         return -EACCES;
 332
 333                 periodic_frequency = arg;
 334
 335                 count = RTC_FREQUENCY;
 336                 do_div(count, arg);
 337
 338                 periodic_count = count;
 339
 340                 spin_lock_irq(&rtc_lock);
 341
 342                 rtc1_write(RTCL1LREG, count);
 343                 rtc1_write(RTCL1HREG, count >> 16);
 344
 345                 spin_unlock_irq(&rtc_lock);
 346                 break;
 347         case RTC_EPOCH_READ:
 348                 return put_user(epoch, (unsigned long __user *)arg);
 349         case RTC_EPOCH_SET:
 350                 /* Doesn't support before 1900 */
 351                 if (arg < 1900)
 352                         return -EINVAL;
 353
 354                 if (capable(CAP_SYS_TIME) == 0)
 355                         return -EACCES;
 356
 357                 epoch = arg;
 358                 break;
 359         default:
 360                 return -EINVAL;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 367                      unsigned long arg)
 368 {
 369         return rtc_do_ioctl(cmd, arg, FUNCTION_RTC_IOCTL);
 370 }
 371
 372 static int rtc_open(struct inode *inode, struct file *file)
 373 {
 374         spin_lock_irq(&rtc_lock);
 375
 376         if (rtc_status == RTC_OPEN) {
 377                 spin_unlock_irq(&rtc_lock);
 378                 return -EBUSY;
 379         }
 380
 381         rtc_status = RTC_OPEN;
 382         rtc_irq_data = 0;
 383
 384         spin_unlock_irq(&rtc_lock);
 385
 386         return 0;
 387 }
 388
 389 static int rtc_release(struct inode *inode, struct file *file)
 390 {
 391         if (file->f_flags & FASYNC)
 392                 (void)fasync_helper(-1, file, 0, &rtc_async_queue);
 393
 394         spin_lock_irq(&rtc_lock);
 395
 396         rtc1_write(ECMPLREG, 0);
 397         rtc1_write(ECMPMREG, 0);
 398         rtc1_write(ECMPHREG, 0);
 399         rtc1_write(RTCL1LREG, 0);
 400         rtc1_write(RTCL1HREG, 0);
 401
 402         rtc_status = RTC_RELEASE;
 403
 404         spin_unlock_irq(&rtc_lock);
 405
 406         disable_irq(ELAPSEDTIME_IRQ);
 407         disable_irq(RTCLONG1_IRQ);
 408
 409         return 0;
 410 }
 411
 412 static int rtc_fasync(int fd, struct file *file, int on)
 413 {
 414         return fasync_helper(fd, file, on, &rtc_async_queue);
 415 }
 416
 417 static struct file_operations rtc_fops = {
 418         .owner          = THIS_MODULE,
 419         .llseek         = no_llseek,
 420         .read           = rtc_read,
 421         .poll           = rtc_poll,
 422         .ioctl          = rtc_ioctl,
 423         .open           = rtc_open,
 424         .release        = rtc_release,
 425         .fasync         = rtc_fasync,
 426 };
 427
 428 static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 429 {
 430         spin_lock(&rtc_lock);
 431         rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
 432
 433         rtc_irq_data += 0x100;
 434         rtc_irq_data &= ~0xff;
 435         rtc_irq_data |= RTC_AF;
 436         spin_unlock(&rtc_lock);
 437
 438         spin_lock(&rtc_lock);
 439         if (rtc_callback)
 440                 rtc_callback->func(rtc_callback->private_data);
 441         spin_unlock(&rtc_lock);
 442
 443         wake_up_interruptible(&rtc_wait);
 444
 445         kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
 446
 447         return IRQ_HANDLED;
 448 }
 449
 450 static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 451 {
 452         unsigned long count = periodic_count;
 453
 454         spin_lock(&rtc_lock);
 455         rtc2_write(RTCINTREG, RTCLONG1_INT);
 456
 457         rtc1_write(RTCL1LREG, count);
 458         rtc1_write(RTCL1HREG, count >> 16);
 459
 460         rtc_irq_data += 0x100;
 461         rtc_irq_data &= ~0xff;
 462         rtc_irq_data |= RTC_PF;
 463         spin_unlock(&rtc_lock);
 464
 465         spin_lock(&rtc_task_lock);
 466         if (rtc_callback)
 467                 rtc_callback->func(rtc_callback->private_data);
 468         spin_unlock(&rtc_task_lock);
 469
 470         wake_up_interruptible(&rtc_wait);
 471
 472         kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
 473
 474         return IRQ_HANDLED;
 475 }
 476
 477 int rtc_register(rtc_task_t *task)
 478 {
 479         if (task == NULL || task->func == NULL)
 480                 return -EINVAL;
 481
 482         spin_lock_irq(&rtc_lock);
 483         if (rtc_status == RTC_OPEN) {
 484                 spin_unlock_irq(&rtc_lock);
 485                 return -EBUSY;
 486         }
 487
 488         spin_lock(&rtc_task_lock);
 489         if (rtc_callback != NULL) {
 490                 spin_unlock(&rtc_task_lock);
 491                 spin_unlock_irq(&rtc_task_lock);
 492                 return -EBUSY;
 493         }
 494
 495         rtc_callback = task;
 496         spin_unlock(&rtc_task_lock);
 497
 498         rtc_status = RTC_OPEN;
 499
 500         spin_unlock_irq(&rtc_lock);
 501
 502         return 0;
 503 }
 504
 505 EXPORT_SYMBOL_GPL(rtc_register);
 506
 507 int rtc_unregister(rtc_task_t *task)
 508 {
 509         spin_lock_irq(&rtc_task_lock);
 510         if (task == NULL || rtc_callback != task) {
 511                 spin_unlock_irq(&rtc_task_lock);
 512                 return -ENXIO;
 513         }
 514
 515         spin_lock(&rtc_lock);
 516
 517         rtc1_write(ECMPLREG, 0);
 518         rtc1_write(ECMPMREG, 0);
 519         rtc1_write(ECMPHREG, 0);
 520         rtc1_write(RTCL1LREG, 0);
 521         rtc1_write(RTCL1HREG, 0);
 522
 523         rtc_status = RTC_RELEASE;
 524
 525         spin_unlock(&rtc_lock);
 526
 527         rtc_callback = NULL;
 528
 529         spin_unlock_irq(&rtc_task_lock);
 530
 531         disable_irq(ELAPSEDTIME_IRQ);
 532         disable_irq(RTCLONG1_IRQ);
 533
 534         return 0;
 535 }
 536
 537 EXPORT_SYMBOL_GPL(rtc_unregister);
 538
 539 int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
 540 {
 541         int retval = 0;
 542
 543         spin_lock_irq(&rtc_task_lock);
 544
 545         if (rtc_callback != task)
 546                 retval = -ENXIO;
 547         else
 548                 rtc_do_ioctl(cmd, arg, FUNCTION_RTC_CONTROL);
 549
 550         spin_unlock_irq(&rtc_task_lock);
 551
 552         return retval;
 553 }
 554
 555 EXPORT_SYMBOL_GPL(rtc_control);
 556
 557 static struct miscdevice rtc_miscdevice = {
 558         .minor  = RTC_MINOR,
 559         .name   = rtc_name,
 560         .fops   = &rtc_fops,
 561 };
 562
 563 static int rtc_probe(struct device *dev)
 564 {
 565         struct platform_device *pdev;
 566         unsigned int irq;
 567         int retval;
 568
 569         pdev = to_platform_device(dev);
 570         if (pdev->num_resources != 2)
 571                 return -EBUSY;
 572
 573         rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE);
 574         if (rtc1_base == NULL)
 575                 return -EBUSY;
 576
 577         rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE);
 578         if (rtc2_base == NULL) {
 579                 iounmap(rtc1_base);
 580                 rtc1_base = NULL;
 581                 return -EBUSY;
 582         }
 583
 584         retval = misc_register(&rtc_miscdevice);
 585         if (retval < 0) {
 586                 iounmap(rtc1_base);
 587                 iounmap(rtc2_base);
 588                 rtc1_base = NULL;
 589                 rtc2_base = NULL;
 590                 return retval;
 591         }
 592
 593         spin_lock_irq(&rtc_lock);
 594
 595         rtc1_write(ECMPLREG, 0);
 596         rtc1_write(ECMPMREG, 0);
 597         rtc1_write(ECMPHREG, 0);
 598         rtc1_write(RTCL1LREG, 0);
 599         rtc1_write(RTCL1HREG, 0);
 600
 601         rtc_status = RTC_RELEASE;
 602         rtc_irq_data = 0;
 603
 604         spin_unlock_irq(&rtc_lock);
 605
 606         init_waitqueue_head(&rtc_wait);
 607
 608         irq = ELAPSEDTIME_IRQ;
 609         retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT,
 610                              "elapsed_time", NULL);
 611         if (retval == 0) {
 612                 irq = RTCLONG1_IRQ;
 613                 retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT,
 614                                      "rtclong1", NULL);
 615         }
 616
 617         if (retval < 0) {
 618                 printk(KERN_ERR "rtc: IRQ%d is busy\n", irq);
 619                 if (irq == RTCLONG1_IRQ)
 620                         free_irq(ELAPSEDTIME_IRQ, NULL);
 621                 iounmap(rtc1_base);
 622                 iounmap(rtc2_base);
 623                 rtc1_base = NULL;
 624                 rtc2_base = NULL;
 625                 return retval;
 626         }
 627
 628         disable_irq(ELAPSEDTIME_IRQ);
 629         disable_irq(RTCLONG1_IRQ);
 630
 631         spin_lock_init(&rtc_task_lock);
 632
 633         printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");
 634
 635         return 0;
 636 }
 637
 638 static int rtc_remove(struct device *dev)
 639 {
 640         int retval;
 641
 642         retval = misc_deregister(&rtc_miscdevice);
 643         if (retval < 0)
 644                 return retval;
 645
 646         free_irq(ELAPSEDTIME_IRQ, NULL);
 647         free_irq(RTCLONG1_IRQ, NULL);
 648         if (rtc1_base != NULL)
 649                 iounmap(rtc1_base);
 650         if (rtc2_base != NULL)
 651                 iounmap(rtc2_base);
 652
 653         return 0;
 654 }
 655
 656 static struct platform_device *rtc_platform_device;
 657
 658 static struct device_driver rtc_device_driver = {
 659         .name           = rtc_name,
 660         .bus            = &platform_bus_type,
 661         .probe          = rtc_probe,
 662         .remove         = rtc_remove,
 663 };
 664
 665 static int __devinit vr41xx_rtc_init(void)
 666 {
 667         int retval;
 668
 669         switch (current_cpu_data.cputype) {
 670         case CPU_VR4111:
 671         case CPU_VR4121:
 672                 rtc_resource[0].start = RTC1_TYPE1_START;
 673                 rtc_resource[0].end = RTC1_TYPE1_END;
 674                 rtc_resource[1].start = RTC2_TYPE1_START;
 675                 rtc_resource[1].end = RTC2_TYPE1_END;
 676                 break;
 677         case CPU_VR4122:
 678         case CPU_VR4131:
 679         case CPU_VR4133:
 680                 rtc_resource[0].start = RTC1_TYPE2_START;
 681                 rtc_resource[0].end = RTC1_TYPE2_END;
 682                 rtc_resource[1].start = RTC2_TYPE2_START;
 683                 rtc_resource[1].end = RTC2_TYPE2_END;
 684                 break;
 685         default:
 686                 return -ENODEV;
 687                 break;
 688         }
 689
 690         rtc_platform_device = platform_device_register_simple("RTC", -1, rtc_resource, RTC_NUM_RESOURCES);
 691         if (IS_ERR(rtc_platform_device))
 692                 return PTR_ERR(rtc_platform_device);
 693
 694         retval = driver_register(&rtc_device_driver);
 695         if (retval < 0)
 696                 platform_device_unregister(rtc_platform_device);
 697
 698         return retval;
 699 }
 700
 701 static void __devexit vr41xx_rtc_exit(void)
 702 {
 703         driver_unregister(&rtc_device_driver);
 704
 705         platform_device_unregister(rtc_platform_device);
 706 }
 707
 708 module_init(vr41xx_rtc_init);
 709 module_exit(vr41xx_rtc_exit);