git.oblomov.eu Git - linux-2.6/blob - arch/sparc64/kernel/time.c

   1 /* time.c: UltraSparc timer and TOD clock support.
   2  *
   3  * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1998 Eddie C. Dost   (ecd@skynet.be)
   5  *
   6  * Based largely on code which is:
   7  *
   8  * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/module.h>
  13 #include <linux/sched.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/kernel.h>
  16 #include <linux/param.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/time.h>
  21 #include <linux/timex.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/mc146818rtc.h>
  25 #include <linux/delay.h>
  26 #include <linux/profile.h>
  27 #include <linux/bcd.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/cpufreq.h>
  30 #include <linux/percpu.h>
  31 #include <linux/miscdevice.h>
  32 #include <linux/rtc.h>
  33 #include <linux/rtc/m48t59.h>
  34 #include <linux/kernel_stat.h>
  35 #include <linux/clockchips.h>
  36 #include <linux/clocksource.h>
  37 #include <linux/of_device.h>
  38 #include <linux/platform_device.h>
  39
  40 #include <asm/oplib.h>
  41 #include <asm/timer.h>
  42 #include <asm/irq.h>
  43 #include <asm/io.h>
  44 #include <asm/prom.h>
  45 #include <asm/starfire.h>
  46 #include <asm/smp.h>
  47 #include <asm/sections.h>
  48 #include <asm/cpudata.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/irq_regs.h>
  51
  52 #include "entry.h"
  53
  54 DEFINE_SPINLOCK(rtc_lock);
  55 static void __iomem *bq4802_regs;
  56
  57 static int set_rtc_mmss(unsigned long);
  58
  59 #define TICK_PRIV_BIT   (1UL << 63)
  60 #define TICKCMP_IRQ_BIT (1UL << 63)
  61
  62 #ifdef CONFIG_SMP
  63 unsigned long profile_pc(struct pt_regs *regs)
  64 {
  65         unsigned long pc = instruction_pointer(regs);
  66
  67         if (in_lock_functions(pc))
  68                 return regs->u_regs[UREG_RETPC];
  69         return pc;
  70 }
  71 EXPORT_SYMBOL(profile_pc);
  72 #endif
  73
  74 static void tick_disable_protection(void)
  75 {
  76         /* Set things up so user can access tick register for profiling
  77          * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
  78          * read back of %tick after writing it.
  79          */
  80         __asm__ __volatile__(
  81         "       ba,pt   %%xcc, 1f\n"
  82         "        nop\n"
  83         "       .align  64\n"
  84         "1:     rd      %%tick, %%g2\n"
  85         "       add     %%g2, 6, %%g2\n"
  86         "       andn    %%g2, %0, %%g2\n"
  87         "       wrpr    %%g2, 0, %%tick\n"
  88         "       rdpr    %%tick, %%g0"
  89         : /* no outputs */
  90         : "r" (TICK_PRIV_BIT)
  91         : "g2");
  92 }
  93
  94 static void tick_disable_irq(void)
  95 {
  96         __asm__ __volatile__(
  97         "       ba,pt   %%xcc, 1f\n"
  98         "        nop\n"
  99         "       .align  64\n"
 100         "1:     wr      %0, 0x0, %%tick_cmpr\n"
 101         "       rd      %%tick_cmpr, %%g0"
 102         : /* no outputs */
 103         : "r" (TICKCMP_IRQ_BIT));
 104 }
 105
 106 static void tick_init_tick(void)
 107 {
 108         tick_disable_protection();
 109         tick_disable_irq();
 110 }
 111
 112 static unsigned long tick_get_tick(void)
 113 {
 114         unsigned long ret;
 115
 116         __asm__ __volatile__("rd        %%tick, %0\n\t"
 117                              "mov       %0, %0"
 118                              : "=r" (ret));
 119
 120         return ret & ~TICK_PRIV_BIT;
 121 }
 122
 123 static int tick_add_compare(unsigned long adj)
 124 {
 125         unsigned long orig_tick, new_tick, new_compare;
 126
 127         __asm__ __volatile__("rd        %%tick, %0"
 128                              : "=r" (orig_tick));
 129
 130         orig_tick &= ~TICKCMP_IRQ_BIT;
 131
 132         /* Workaround for Spitfire Errata (#54 I think??), I discovered
 133          * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
 134          * number 103640.
 135          *
 136          * On Blackbird writes to %tick_cmpr can fail, the
 137          * workaround seems to be to execute the wr instruction
 138          * at the start of an I-cache line, and perform a dummy
 139          * read back from %tick_cmpr right after writing to it. -DaveM
 140          */
 141         __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t"
 142                              " add      %1, %2, %0\n\t"
 143                              ".align    64\n"
 144                              "1:\n\t"
 145                              "wr        %0, 0, %%tick_cmpr\n\t"
 146                              "rd        %%tick_cmpr, %%g0\n\t"
 147                              : "=r" (new_compare)
 148                              : "r" (orig_tick), "r" (adj));
 149
 150         __asm__ __volatile__("rd        %%tick, %0"
 151                              : "=r" (new_tick));
 152         new_tick &= ~TICKCMP_IRQ_BIT;
 153
 154         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 155 }
 156
 157 static unsigned long tick_add_tick(unsigned long adj)
 158 {
 159         unsigned long new_tick;
 160
 161         /* Also need to handle Blackbird bug here too. */
 162         __asm__ __volatile__("rd        %%tick, %0\n\t"
 163                              "add       %0, %1, %0\n\t"
 164                              "wrpr      %0, 0, %%tick\n\t"
 165                              : "=&r" (new_tick)
 166                              : "r" (adj));
 167
 168         return new_tick;
 169 }
 170
 171 static struct sparc64_tick_ops tick_operations __read_mostly = {
 172         .name           =       "tick",
 173         .init_tick      =       tick_init_tick,
 174         .disable_irq    =       tick_disable_irq,
 175         .get_tick       =       tick_get_tick,
 176         .add_tick       =       tick_add_tick,
 177         .add_compare    =       tick_add_compare,
 178         .softint_mask   =       1UL << 0,
 179 };
 180
 181 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
 182
 183 static void stick_disable_irq(void)
 184 {
 185         __asm__ __volatile__(
 186         "wr     %0, 0x0, %%asr25"
 187         : /* no outputs */
 188         : "r" (TICKCMP_IRQ_BIT));
 189 }
 190
 191 static void stick_init_tick(void)
 192 {
 193         /* Writes to the %tick and %stick register are not
 194          * allowed on sun4v.  The Hypervisor controls that
 195          * bit, per-strand.
 196          */
 197         if (tlb_type != hypervisor) {
 198                 tick_disable_protection();
 199                 tick_disable_irq();
 200
 201                 /* Let the user get at STICK too. */
 202                 __asm__ __volatile__(
 203                 "       rd      %%asr24, %%g2\n"
 204                 "       andn    %%g2, %0, %%g2\n"
 205                 "       wr      %%g2, 0, %%asr24"
 206                 : /* no outputs */
 207                 : "r" (TICK_PRIV_BIT)
 208                 : "g1", "g2");
 209         }
 210
 211         stick_disable_irq();
 212 }
 213
 214 static unsigned long stick_get_tick(void)
 215 {
 216         unsigned long ret;
 217
 218         __asm__ __volatile__("rd        %%asr24, %0"
 219                              : "=r" (ret));
 220
 221         return ret & ~TICK_PRIV_BIT;
 222 }
 223
 224 static unsigned long stick_add_tick(unsigned long adj)
 225 {
 226         unsigned long new_tick;
 227
 228         __asm__ __volatile__("rd        %%asr24, %0\n\t"
 229                              "add       %0, %1, %0\n\t"
 230                              "wr        %0, 0, %%asr24\n\t"
 231                              : "=&r" (new_tick)
 232                              : "r" (adj));
 233
 234         return new_tick;
 235 }
 236
 237 static int stick_add_compare(unsigned long adj)
 238 {
 239         unsigned long orig_tick, new_tick;
 240
 241         __asm__ __volatile__("rd        %%asr24, %0"
 242                              : "=r" (orig_tick));
 243         orig_tick &= ~TICKCMP_IRQ_BIT;
 244
 245         __asm__ __volatile__("wr        %0, 0, %%asr25"
 246                              : /* no outputs */
 247                              : "r" (orig_tick + adj));
 248
 249         __asm__ __volatile__("rd        %%asr24, %0"
 250                              : "=r" (new_tick));
 251         new_tick &= ~TICKCMP_IRQ_BIT;
 252
 253         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 254 }
 255
 256 static struct sparc64_tick_ops stick_operations __read_mostly = {
 257         .name           =       "stick",
 258         .init_tick      =       stick_init_tick,
 259         .disable_irq    =       stick_disable_irq,
 260         .get_tick       =       stick_get_tick,
 261         .add_tick       =       stick_add_tick,
 262         .add_compare    =       stick_add_compare,
 263         .softint_mask   =       1UL << 16,
 264 };
 265
 266 /* On Hummingbird the STICK/STICK_CMPR register is implemented
 267  * in I/O space.  There are two 64-bit registers each, the
 268  * first holds the low 32-bits of the value and the second holds
 269  * the high 32-bits.
 270  *
 271  * Since STICK is constantly updating, we have to access it carefully.
 272  *
 273  * The sequence we use to read is:
 274  * 1) read high
 275  * 2) read low
 276  * 3) read high again, if it rolled re-read both low and high again.
 277  *
 278  * Writing STICK safely is also tricky:
 279  * 1) write low to zero
 280  * 2) write high
 281  * 3) write low
 282  */
 283 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
 284 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
 285
 286 static unsigned long __hbird_read_stick(void)
 287 {
 288         unsigned long ret, tmp1, tmp2, tmp3;
 289         unsigned long addr = HBIRD_STICK_ADDR+8;
 290
 291         __asm__ __volatile__("ldxa      [%1] %5, %2\n"
 292                              "1:\n\t"
 293                              "sub       %1, 0x8, %1\n\t"
 294                              "ldxa      [%1] %5, %3\n\t"
 295                              "add       %1, 0x8, %1\n\t"
 296                              "ldxa      [%1] %5, %4\n\t"
 297                              "cmp       %4, %2\n\t"
 298                              "bne,a,pn  %%xcc, 1b\n\t"
 299                              " mov      %4, %2\n\t"
 300                              "sllx      %4, 32, %4\n\t"
 301                              "or        %3, %4, %0\n\t"
 302                              : "=&r" (ret), "=&r" (addr),
 303                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
 304                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
 305
 306         return ret;
 307 }
 308
 309 static void __hbird_write_stick(unsigned long val)
 310 {
 311         unsigned long low = (val & 0xffffffffUL);
 312         unsigned long high = (val >> 32UL);
 313         unsigned long addr = HBIRD_STICK_ADDR;
 314
 315         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
 316                              "add       %0, 0x8, %0\n\t"
 317                              "stxa      %3, [%0] %4\n\t"
 318                              "sub       %0, 0x8, %0\n\t"
 319                              "stxa      %2, [%0] %4"
 320                              : "=&r" (addr)
 321                              : "0" (addr), "r" (low), "r" (high),
 322                                "i" (ASI_PHYS_BYPASS_EC_E));
 323 }
 324
 325 static void __hbird_write_compare(unsigned long val)
 326 {
 327         unsigned long low = (val & 0xffffffffUL);
 328         unsigned long high = (val >> 32UL);
 329         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
 330
 331         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
 332                              "sub       %0, 0x8, %0\n\t"
 333                              "stxa      %2, [%0] %4"
 334                              : "=&r" (addr)
 335                              : "0" (addr), "r" (low), "r" (high),
 336                                "i" (ASI_PHYS_BYPASS_EC_E));
 337 }
 338
 339 static void hbtick_disable_irq(void)
 340 {
 341         __hbird_write_compare(TICKCMP_IRQ_BIT);
 342 }
 343
 344 static void hbtick_init_tick(void)
 345 {
 346         tick_disable_protection();
 347
 348         /* XXX This seems to be necessary to 'jumpstart' Hummingbird
 349          * XXX into actually sending STICK interrupts.  I think because
 350          * XXX of how we store %tick_cmpr in head.S this somehow resets the
 351          * XXX {TICK + STICK} interrupt mux.  -DaveM
 352          */
 353         __hbird_write_stick(__hbird_read_stick());
 354
 355         hbtick_disable_irq();
 356 }
 357
 358 static unsigned long hbtick_get_tick(void)
 359 {
 360         return __hbird_read_stick() & ~TICK_PRIV_BIT;
 361 }
 362
 363 static unsigned long hbtick_add_tick(unsigned long adj)
 364 {
 365         unsigned long val;
 366
 367         val = __hbird_read_stick() + adj;
 368         __hbird_write_stick(val);
 369
 370         return val;
 371 }
 372
 373 static int hbtick_add_compare(unsigned long adj)
 374 {
 375         unsigned long val = __hbird_read_stick();
 376         unsigned long val2;
 377
 378         val &= ~TICKCMP_IRQ_BIT;
 379         val += adj;
 380         __hbird_write_compare(val);
 381
 382         val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
 383
 384         return ((long)(val2 - val)) > 0L;
 385 }
 386
 387 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
 388         .name           =       "hbtick",
 389         .init_tick      =       hbtick_init_tick,
 390         .disable_irq    =       hbtick_disable_irq,
 391         .get_tick       =       hbtick_get_tick,
 392         .add_tick       =       hbtick_add_tick,
 393         .add_compare    =       hbtick_add_compare,
 394         .softint_mask   =       1UL << 0,
 395 };
 396
 397 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 398
 399 int update_persistent_clock(struct timespec now)
 400 {
 401         struct rtc_device *rtc = rtc_class_open("rtc0");
 402
 403         if (rtc)
 404                 return rtc_set_mmss(rtc, now.tv_sec);
 405
 406         return set_rtc_mmss(now.tv_sec);
 407 }
 408
 409 /* Probe for the real time clock chip. */
 410 static void __init set_system_time(void)
 411 {
 412         unsigned int year, mon, day, hour, min, sec;
 413         void __iomem *bregs = bq4802_regs;
 414         unsigned char val = readb(bregs + 0x0e);
 415         unsigned int century;
 416
 417         if (!bregs) {
 418                 prom_printf("Something wrong, clock regs not mapped yet.\n");
 419                 prom_halt();
 420         }
 421
 422         /* BQ4802 RTC chip. */
 423
 424         writeb(val | 0x08, bregs + 0x0e);
 425
 426         sec  = readb(bregs + 0x00);
 427         min  = readb(bregs + 0x02);
 428         hour = readb(bregs + 0x04);
 429         day  = readb(bregs + 0x06);
 430         mon  = readb(bregs + 0x09);
 431         year = readb(bregs + 0x0a);
 432         century = readb(bregs + 0x0f);
 433
 434         writeb(val, bregs + 0x0e);
 435
 436         BCD_TO_BIN(sec);
 437         BCD_TO_BIN(min);
 438         BCD_TO_BIN(hour);
 439         BCD_TO_BIN(day);
 440         BCD_TO_BIN(mon);
 441         BCD_TO_BIN(year);
 442         BCD_TO_BIN(century);
 443
 444         year += (century * 100);
 445
 446         xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
 447         xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 448         set_normalized_timespec(&wall_to_monotonic,
 449                                 -xtime.tv_sec, -xtime.tv_nsec);
 450 }
 451
 452 /* davem suggests we keep this within the 4M locked kernel image */
 453 static u32 starfire_get_time(void)
 454 {
 455         static char obp_gettod[32];
 456         static u32 unix_tod;
 457
 458         sprintf(obp_gettod, "h# %08x unix-gettod",
 459                 (unsigned int) (long) &unix_tod);
 460         prom_feval(obp_gettod);
 461
 462         return unix_tod;
 463 }
 464
 465 static int starfire_set_time(u32 val)
 466 {
 467         /* Do nothing, time is set using the service processor
 468          * console on this platform.
 469          */
 470         return 0;
 471 }
 472
 473 static u32 hypervisor_get_time(void)
 474 {
 475         unsigned long ret, time;
 476         int retries = 10000;
 477
 478 retry:
 479         ret = sun4v_tod_get(&time);
 480         if (ret == HV_EOK)
 481                 return time;
 482         if (ret == HV_EWOULDBLOCK) {
 483                 if (--retries > 0) {
 484                         udelay(100);
 485                         goto retry;
 486                 }
 487                 printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
 488                 return 0;
 489         }
 490         printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
 491         return 0;
 492 }
 493
 494 static int hypervisor_set_time(u32 secs)
 495 {
 496         unsigned long ret;
 497         int retries = 10000;
 498
 499 retry:
 500         ret = sun4v_tod_set(secs);
 501         if (ret == HV_EOK)
 502                 return 0;
 503         if (ret == HV_EWOULDBLOCK) {
 504                 if (--retries > 0) {
 505                         udelay(100);
 506                         goto retry;
 507                 }
 508                 printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
 509                 return -EAGAIN;
 510         }
 511         printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
 512         return -EOPNOTSUPP;
 513 }
 514
 515 unsigned long cmos_regs;
 516 EXPORT_SYMBOL(cmos_regs);
 517
 518 struct resource rtc_cmos_resource;
 519
 520 static struct platform_device rtc_cmos_device = {
 521         .name           = "rtc_cmos",
 522         .id             = -1,
 523         .resource       = &rtc_cmos_resource,
 524         .num_resources  = 1,
 525 };
 526
 527 static int __devinit rtc_probe(struct of_device *op, const struct of_device_id *match)
 528 {
 529         struct resource *r;
 530
 531         printk(KERN_INFO "%s: RTC regs at 0x%lx\n",
 532                op->node->full_name, op->resource[0].start);
 533
 534         /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
 535          * up a fake resource so that the probe works for all cases.
 536          * When the RTC is behind an ISA bus it will have IORESOURCE_IO
 537          * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
 538          */
 539
 540         r = &rtc_cmos_resource;
 541         r->flags = IORESOURCE_IO;
 542         r->name = op->resource[0].name;
 543         r->start = op->resource[0].start;
 544         r->end = op->resource[0].end;
 545
 546         cmos_regs = op->resource[0].start;
 547         return platform_device_register(&rtc_cmos_device);
 548 }
 549
 550 static struct of_device_id rtc_match[] = {
 551         {
 552                 .name = "rtc",
 553                 .compatible = "m5819",
 554         },
 555         {
 556                 .name = "rtc",
 557                 .compatible = "isa-m5819p",
 558         },
 559         {
 560                 .name = "rtc",
 561                 .compatible = "isa-m5823p",
 562         },
 563         {
 564                 .name = "rtc",
 565                 .compatible = "ds1287",
 566         },
 567         {},
 568 };
 569
 570 static struct of_platform_driver rtc_driver = {
 571         .match_table    = rtc_match,
 572         .probe          = rtc_probe,
 573         .driver         = {
 574                 .name   = "rtc",
 575         },
 576 };
 577
 578 static int __devinit bq4802_probe(struct of_device *op, const struct of_device_id *match)
 579 {
 580         struct device_node *dp = op->node;
 581         unsigned long flags;
 582
 583         bq4802_regs = of_ioremap(&op->resource[0], 0, resource_size(&op->resource[0]), "bq4802");
 584         if (!bq4802_regs)
 585                 return -ENOMEM;
 586
 587         printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, bq4802_regs);
 588
 589         local_irq_save(flags);
 590
 591         set_system_time();
 592
 593         local_irq_restore(flags);
 594
 595         return 0;
 596 }
 597
 598 static struct of_device_id bq4802_match[] = {
 599         {
 600                 .name = "rtc",
 601                 .compatible = "bq4802",
 602         },
 603 };
 604
 605 static struct of_platform_driver bq4802_driver = {
 606         .match_table    = bq4802_match,
 607         .probe          = bq4802_probe,
 608         .driver         = {
 609                 .name   = "bq4802",
 610         },
 611 };
 612
 613 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 614 {
 615         struct platform_device *pdev = to_platform_device(dev);
 616         void __iomem *regs;
 617         unsigned char val;
 618
 619         regs = (void __iomem *) pdev->resource[0].start;
 620         val = readb(regs + ofs);
 621
 622         /* the year 0 is 1968 */
 623         if (ofs == M48T59_YEAR) {
 624                 val += 0x68;
 625                 if ((val & 0xf) > 9)
 626                         val += 6;
 627         }
 628         return val;
 629 }
 630
 631 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
 632 {
 633         struct platform_device *pdev = to_platform_device(dev);
 634         void __iomem *regs;
 635
 636         regs = (void __iomem *) pdev->resource[0].start;
 637         if (ofs == M48T59_YEAR) {
 638                 if (val < 0x68)
 639                         val += 0x32;
 640                 else
 641                         val -= 0x68;
 642                 if ((val & 0xf) > 9)
 643                         val += 6;
 644                 if ((val & 0xf0) > 0x9A)
 645                         val += 0x60;
 646         }
 647         writeb(val, regs + ofs);
 648 }
 649
 650 static struct m48t59_plat_data m48t59_data = {
 651         .read_byte      = mostek_read_byte,
 652         .write_byte     = mostek_write_byte,
 653 };
 654
 655 static struct platform_device m48t59_rtc = {
 656         .name           = "rtc-m48t59",
 657         .id             = 0,
 658         .num_resources  = 1,
 659         .dev    = {
 660                 .platform_data = &m48t59_data,
 661         },
 662 };
 663
 664 static int __devinit mostek_probe(struct of_device *op, const struct of_device_id *match)
 665 {
 666         struct device_node *dp = op->node;
 667
 668         /* On an Enterprise system there can be multiple mostek clocks.
 669          * We should only match the one that is on the central FHC bus.
 670          */
 671         if (!strcmp(dp->parent->name, "fhc") &&
 672             strcmp(dp->parent->parent->name, "central") != 0)
 673                 return -ENODEV;
 674
 675         printk(KERN_INFO "%s: Mostek regs at 0x%lx\n",
 676                dp->full_name, op->resource[0].start);
 677
 678         m48t59_rtc.resource = &op->resource[0];
 679         return platform_device_register(&m48t59_rtc);
 680 }
 681
 682 static struct of_device_id mostek_match[] = {
 683         {
 684                 .name = "eeprom",
 685         },
 686         {},
 687 };
 688
 689 static struct of_platform_driver mostek_driver = {
 690         .match_table    = mostek_match,
 691         .probe          = mostek_probe,
 692         .driver         = {
 693                 .name   = "mostek",
 694         },
 695 };
 696
 697 static int __init clock_init(void)
 698 {
 699         if (this_is_starfire) {
 700                 xtime.tv_sec = starfire_get_time();
 701                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 702                 set_normalized_timespec(&wall_to_monotonic,
 703                                         -xtime.tv_sec, -xtime.tv_nsec);
 704                 return 0;
 705         }
 706         if (tlb_type == hypervisor) {
 707                 xtime.tv_sec = hypervisor_get_time();
 708                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 709                 set_normalized_timespec(&wall_to_monotonic,
 710                                         -xtime.tv_sec, -xtime.tv_nsec);
 711                 return 0;
 712         }
 713
 714         (void) of_register_driver(&rtc_driver, &of_platform_bus_type);
 715         (void) of_register_driver(&mostek_driver, &of_platform_bus_type);
 716         (void) of_register_driver(&bq4802_driver, &of_platform_bus_type);
 717
 718         return 0;
 719 }
 720
 721 /* Must be after subsys_initcall() so that busses are probed.  Must
 722  * be before device_initcall() because things like the RTC driver
 723  * need to see the clock registers.
 724  */
 725 fs_initcall(clock_init);
 726
 727 /* This is gets the master TICK_INT timer going. */
 728 static unsigned long sparc64_init_timers(void)
 729 {
 730         struct device_node *dp;
 731         unsigned long clock;
 732
 733         dp = of_find_node_by_path("/");
 734         if (tlb_type == spitfire) {
 735                 unsigned long ver, manuf, impl;
 736
 737                 __asm__ __volatile__ ("rdpr %%ver, %0"
 738                                       : "=&r" (ver));
 739                 manuf = ((ver >> 48) & 0xffff);
 740                 impl = ((ver >> 32) & 0xffff);
 741                 if (manuf == 0x17 && impl == 0x13) {
 742                         /* Hummingbird, aka Ultra-IIe */
 743                         tick_ops = &hbtick_operations;
 744                         clock = of_getintprop_default(dp, "stick-frequency", 0);
 745                 } else {
 746                         tick_ops = &tick_operations;
 747                         clock = local_cpu_data().clock_tick;
 748                 }
 749         } else {
 750                 tick_ops = &stick_operations;
 751                 clock = of_getintprop_default(dp, "stick-frequency", 0);
 752         }
 753
 754         return clock;
 755 }
 756
 757 struct freq_table {
 758         unsigned long clock_tick_ref;
 759         unsigned int ref_freq;
 760 };
 761 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
 762
 763 unsigned long sparc64_get_clock_tick(unsigned int cpu)
 764 {
 765         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 766
 767         if (ft->clock_tick_ref)
 768                 return ft->clock_tick_ref;
 769         return cpu_data(cpu).clock_tick;
 770 }
 771
 772 #ifdef CONFIG_CPU_FREQ
 773
 774 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 775                                     void *data)
 776 {
 777         struct cpufreq_freqs *freq = data;
 778         unsigned int cpu = freq->cpu;
 779         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 780
 781         if (!ft->ref_freq) {
 782                 ft->ref_freq = freq->old;
 783                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
 784         }
 785         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
 786             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
 787             (val == CPUFREQ_RESUMECHANGE)) {
 788                 cpu_data(cpu).clock_tick =
 789                         cpufreq_scale(ft->clock_tick_ref,
 790                                       ft->ref_freq,
 791                                       freq->new);
 792         }
 793
 794         return 0;
 795 }
 796
 797 static struct notifier_block sparc64_cpufreq_notifier_block = {
 798         .notifier_call  = sparc64_cpufreq_notifier
 799 };
 800
 801 static int __init register_sparc64_cpufreq_notifier(void)
 802 {
 803
 804         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
 805                                   CPUFREQ_TRANSITION_NOTIFIER);
 806         return 0;
 807 }
 808
 809 core_initcall(register_sparc64_cpufreq_notifier);
 810
 811 #endif /* CONFIG_CPU_FREQ */
 812
 813 static int sparc64_next_event(unsigned long delta,
 814                               struct clock_event_device *evt)
 815 {
 816         return tick_ops->add_compare(delta) ? -ETIME : 0;
 817 }
 818
 819 static void sparc64_timer_setup(enum clock_event_mode mode,
 820                                 struct clock_event_device *evt)
 821 {
 822         switch (mode) {
 823         case CLOCK_EVT_MODE_ONESHOT:
 824         case CLOCK_EVT_MODE_RESUME:
 825                 break;
 826
 827         case CLOCK_EVT_MODE_SHUTDOWN:
 828                 tick_ops->disable_irq();
 829                 break;
 830
 831         case CLOCK_EVT_MODE_PERIODIC:
 832         case CLOCK_EVT_MODE_UNUSED:
 833                 WARN_ON(1);
 834                 break;
 835         };
 836 }
 837
 838 static struct clock_event_device sparc64_clockevent = {
 839         .features       = CLOCK_EVT_FEAT_ONESHOT,
 840         .set_mode       = sparc64_timer_setup,
 841         .set_next_event = sparc64_next_event,
 842         .rating         = 100,
 843         .shift          = 30,
 844         .irq            = -1,
 845 };
 846 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
 847
 848 void timer_interrupt(int irq, struct pt_regs *regs)
 849 {
 850         struct pt_regs *old_regs = set_irq_regs(regs);
 851         unsigned long tick_mask = tick_ops->softint_mask;
 852         int cpu = smp_processor_id();
 853         struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
 854
 855         clear_softint(tick_mask);
 856
 857         irq_enter();
 858
 859         kstat_this_cpu.irqs[0]++;
 860
 861         if (unlikely(!evt->event_handler)) {
 862                 printk(KERN_WARNING
 863                        "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
 864         } else
 865                 evt->event_handler(evt);
 866
 867         irq_exit();
 868
 869         set_irq_regs(old_regs);
 870 }
 871
 872 void __devinit setup_sparc64_timer(void)
 873 {
 874         struct clock_event_device *sevt;
 875         unsigned long pstate;
 876
 877         /* Guarantee that the following sequences execute
 878          * uninterrupted.
 879          */
 880         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 881                              "wrpr      %0, %1, %%pstate"
 882                              : "=r" (pstate)
 883                              : "i" (PSTATE_IE));
 884
 885         tick_ops->init_tick();
 886
 887         /* Restore PSTATE_IE. */
 888         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 889                              : /* no outputs */
 890                              : "r" (pstate));
 891
 892         sevt = &__get_cpu_var(sparc64_events);
 893
 894         memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
 895         sevt->cpumask = cpumask_of_cpu(smp_processor_id());
 896
 897         clockevents_register_device(sevt);
 898 }
 899
 900 #define SPARC64_NSEC_PER_CYC_SHIFT      10UL
 901
 902 static struct clocksource clocksource_tick = {
 903         .rating         = 100,
 904         .mask           = CLOCKSOURCE_MASK(64),
 905         .shift          = 16,
 906         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 907 };
 908
 909 static void __init setup_clockevent_multiplier(unsigned long hz)
 910 {
 911         unsigned long mult, shift = 32;
 912
 913         while (1) {
 914                 mult = div_sc(hz, NSEC_PER_SEC, shift);
 915                 if (mult && (mult >> 32UL) == 0UL)
 916                         break;
 917
 918                 shift--;
 919         }
 920
 921         sparc64_clockevent.shift = shift;
 922         sparc64_clockevent.mult = mult;
 923 }
 924
 925 static unsigned long tb_ticks_per_usec __read_mostly;
 926
 927 void __delay(unsigned long loops)
 928 {
 929         unsigned long bclock, now;
 930
 931         bclock = tick_ops->get_tick();
 932         do {
 933                 now = tick_ops->get_tick();
 934         } while ((now-bclock) < loops);
 935 }
 936 EXPORT_SYMBOL(__delay);
 937
 938 void udelay(unsigned long usecs)
 939 {
 940         __delay(tb_ticks_per_usec * usecs);
 941 }
 942 EXPORT_SYMBOL(udelay);
 943
 944 void __init time_init(void)
 945 {
 946         unsigned long clock = sparc64_init_timers();
 947
 948         tb_ticks_per_usec = clock / USEC_PER_SEC;
 949
 950         timer_ticks_per_nsec_quotient =
 951                 clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
 952
 953         clocksource_tick.name = tick_ops->name;
 954         clocksource_tick.mult =
 955                 clocksource_hz2mult(clock,
 956                                     clocksource_tick.shift);
 957         clocksource_tick.read = tick_ops->get_tick;
 958
 959         printk("clocksource: mult[%x] shift[%d]\n",
 960                clocksource_tick.mult, clocksource_tick.shift);
 961
 962         clocksource_register(&clocksource_tick);
 963
 964         sparc64_clockevent.name = tick_ops->name;
 965
 966         setup_clockevent_multiplier(clock);
 967
 968         sparc64_clockevent.max_delta_ns =
 969                 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
 970         sparc64_clockevent.min_delta_ns =
 971                 clockevent_delta2ns(0xF, &sparc64_clockevent);
 972
 973         printk("clockevent: mult[%lx] shift[%d]\n",
 974                sparc64_clockevent.mult, sparc64_clockevent.shift);
 975
 976         setup_sparc64_timer();
 977 }
 978
 979 unsigned long long sched_clock(void)
 980 {
 981         unsigned long ticks = tick_ops->get_tick();
 982
 983         return (ticks * timer_ticks_per_nsec_quotient)
 984                 >> SPARC64_NSEC_PER_CYC_SHIFT;
 985 }
 986
 987 static int set_rtc_mmss(unsigned long nowtime)
 988 {
 989         int real_seconds, real_minutes, chip_minutes;
 990         void __iomem *bregs = bq4802_regs;
 991         unsigned long flags;
 992         unsigned char val;
 993         int retval = 0;
 994
 995         /*
 996          * Not having a register set can lead to trouble.
 997          * Also starfire doesn't have a tod clock.
 998          */
 999         if (!bregs)
1000                 return -1;
1001
1002         spin_lock_irqsave(&rtc_lock, flags);
1003
1004         val = readb(bregs + 0x0e);
1005
1006         /* BQ4802 RTC chip. */
1007
1008         writeb(val | 0x08, bregs + 0x0e);
1009
1010         chip_minutes = readb(bregs + 0x02);
1011         BCD_TO_BIN(chip_minutes);
1012         real_seconds = nowtime % 60;
1013         real_minutes = nowtime / 60;
1014         if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1015                 real_minutes += 30;
1016         real_minutes %= 60;
1017
1018         if (abs(real_minutes - chip_minutes) < 30) {
1019                 BIN_TO_BCD(real_seconds);
1020                 BIN_TO_BCD(real_minutes);
1021                 writeb(real_seconds, bregs + 0x00);
1022                 writeb(real_minutes, bregs + 0x02);
1023         } else {
1024                 printk(KERN_WARNING
1025                        "set_rtc_mmss: can't update from %d to %d\n",
1026                        chip_minutes, real_minutes);
1027                 retval = -1;
1028         }
1029
1030         writeb(val, bregs + 0x0e);
1031
1032         spin_unlock_irqrestore(&rtc_lock, flags);
1033
1034         return retval;
1035 }
1036
1037 #define RTC_IS_OPEN             0x01    /* means /dev/rtc is in use     */
1038 static unsigned char mini_rtc_status;   /* bitmapped status byte.       */
1039
1040 #define FEBRUARY        2
1041 #define STARTOFTIME     1970
1042 #define SECDAY          86400L
1043 #define SECYR           (SECDAY * 365)
1044 #define leapyear(year)          ((year) % 4 == 0 && \
1045                                  ((year) % 100 != 0 || (year) % 400 == 0))
1046 #define days_in_year(a)         (leapyear(a) ? 366 : 365)
1047 #define days_in_month(a)        (month_days[(a) - 1])
1048
1049 static int month_days[12] = {
1050         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1051 };
1052
1053 /*
1054  * This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
1055  */
1056 static void GregorianDay(struct rtc_time * tm)
1057 {
1058         int leapsToDate;
1059         int lastYear;
1060         int day;
1061         int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1062
1063         lastYear = tm->tm_year - 1;
1064
1065         /*
1066          * Number of leap corrections to apply up to end of last year
1067          */
1068         leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1069
1070         /*
1071          * This year is a leap year if it is divisible by 4 except when it is
1072          * divisible by 100 unless it is divisible by 400
1073          *
1074          * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
1075          */
1076         day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1077
1078         day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1079                    tm->tm_mday;
1080
1081         tm->tm_wday = day % 7;
1082 }
1083
1084 static void to_tm(int tim, struct rtc_time *tm)
1085 {
1086         register int    i;
1087         register long   hms, day;
1088
1089         day = tim / SECDAY;
1090         hms = tim % SECDAY;
1091
1092         /* Hours, minutes, seconds are easy */
1093         tm->tm_hour = hms / 3600;
1094         tm->tm_min = (hms % 3600) / 60;
1095         tm->tm_sec = (hms % 3600) % 60;
1096
1097         /* Number of years in days */
1098         for (i = STARTOFTIME; day >= days_in_year(i); i++)
1099                 day -= days_in_year(i);
1100         tm->tm_year = i;
1101
1102         /* Number of months in days left */
1103         if (leapyear(tm->tm_year))
1104                 days_in_month(FEBRUARY) = 29;
1105         for (i = 1; day >= days_in_month(i); i++)
1106                 day -= days_in_month(i);
1107         days_in_month(FEBRUARY) = 28;
1108         tm->tm_mon = i;
1109
1110         /* Days are what is left over (+1) from all that. */
1111         tm->tm_mday = day + 1;
1112
1113         /*
1114          * Determine the day of week
1115          */
1116         GregorianDay(tm);
1117 }
1118
1119 /* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
1120  * aka Unix time.  So we have to convert to/from rtc_time.
1121  */
1122 static void starfire_get_rtc_time(struct rtc_time *time)
1123 {
1124         u32 seconds = starfire_get_time();
1125
1126         to_tm(seconds, time);
1127         time->tm_year -= 1900;
1128         time->tm_mon -= 1;
1129 }
1130
1131 static int starfire_set_rtc_time(struct rtc_time *time)
1132 {
1133         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1134                              time->tm_mday, time->tm_hour,
1135                              time->tm_min, time->tm_sec);
1136
1137         return starfire_set_time(seconds);
1138 }
1139
1140 static void hypervisor_get_rtc_time(struct rtc_time *time)
1141 {
1142         u32 seconds = hypervisor_get_time();
1143
1144         to_tm(seconds, time);
1145         time->tm_year -= 1900;
1146         time->tm_mon -= 1;
1147 }
1148
1149 static int hypervisor_set_rtc_time(struct rtc_time *time)
1150 {
1151         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1152                              time->tm_mday, time->tm_hour,
1153                              time->tm_min, time->tm_sec);
1154
1155         return hypervisor_set_time(seconds);
1156 }
1157
1158 static void bq4802_get_rtc_time(struct rtc_time *time)
1159 {
1160         unsigned char val = readb(bq4802_regs + 0x0e);
1161         unsigned int century;
1162
1163         writeb(val | 0x08, bq4802_regs + 0x0e);
1164
1165         time->tm_sec = readb(bq4802_regs + 0x00);
1166         time->tm_min = readb(bq4802_regs + 0x02);
1167         time->tm_hour = readb(bq4802_regs + 0x04);
1168         time->tm_mday = readb(bq4802_regs + 0x06);
1169         time->tm_mon = readb(bq4802_regs + 0x09);
1170         time->tm_year = readb(bq4802_regs + 0x0a);
1171         time->tm_wday = readb(bq4802_regs + 0x08);
1172         century = readb(bq4802_regs + 0x0f);
1173
1174         writeb(val, bq4802_regs + 0x0e);
1175
1176         BCD_TO_BIN(time->tm_sec);
1177         BCD_TO_BIN(time->tm_min);
1178         BCD_TO_BIN(time->tm_hour);
1179         BCD_TO_BIN(time->tm_mday);
1180         BCD_TO_BIN(time->tm_mon);
1181         BCD_TO_BIN(time->tm_year);
1182         BCD_TO_BIN(time->tm_wday);
1183         BCD_TO_BIN(century);
1184
1185         time->tm_year += (century * 100);
1186         time->tm_year -= 1900;
1187
1188         time->tm_mon--;
1189 }
1190
1191 static int bq4802_set_rtc_time(struct rtc_time *time)
1192 {
1193         unsigned char val = readb(bq4802_regs + 0x0e);
1194         unsigned char sec, min, hrs, day, mon, yrs, century;
1195         unsigned int year;
1196
1197         year = time->tm_year + 1900;
1198         century = year / 100;
1199         yrs = year % 100;
1200
1201         mon = time->tm_mon + 1;   /* tm_mon starts at zero */
1202         day = time->tm_mday;
1203         hrs = time->tm_hour;
1204         min = time->tm_min;
1205         sec = time->tm_sec;
1206
1207         BIN_TO_BCD(sec);
1208         BIN_TO_BCD(min);
1209         BIN_TO_BCD(hrs);
1210         BIN_TO_BCD(day);
1211         BIN_TO_BCD(mon);
1212         BIN_TO_BCD(yrs);
1213         BIN_TO_BCD(century);
1214
1215         writeb(val | 0x08, bq4802_regs + 0x0e);
1216
1217         writeb(sec, bq4802_regs + 0x00);
1218         writeb(min, bq4802_regs + 0x02);
1219         writeb(hrs, bq4802_regs + 0x04);
1220         writeb(day, bq4802_regs + 0x06);
1221         writeb(mon, bq4802_regs + 0x09);
1222         writeb(yrs, bq4802_regs + 0x0a);
1223         writeb(century, bq4802_regs + 0x0f);
1224
1225         writeb(val, bq4802_regs + 0x0e);
1226
1227         return 0;
1228 }
1229
1230 struct mini_rtc_ops {
1231         void (*get_rtc_time)(struct rtc_time *);
1232         int (*set_rtc_time)(struct rtc_time *);
1233 };
1234
1235 static struct mini_rtc_ops starfire_rtc_ops = {
1236         .get_rtc_time = starfire_get_rtc_time,
1237         .set_rtc_time = starfire_set_rtc_time,
1238 };
1239
1240 static struct mini_rtc_ops hypervisor_rtc_ops = {
1241         .get_rtc_time = hypervisor_get_rtc_time,
1242         .set_rtc_time = hypervisor_set_rtc_time,
1243 };
1244
1245 static struct mini_rtc_ops bq4802_rtc_ops = {
1246         .get_rtc_time = bq4802_get_rtc_time,
1247         .set_rtc_time = bq4802_set_rtc_time,
1248 };
1249
1250 static struct mini_rtc_ops *mini_rtc_ops;
1251
1252 static inline void mini_get_rtc_time(struct rtc_time *time)
1253 {
1254         unsigned long flags;
1255
1256         spin_lock_irqsave(&rtc_lock, flags);
1257         mini_rtc_ops->get_rtc_time(time);
1258         spin_unlock_irqrestore(&rtc_lock, flags);
1259 }
1260
1261 static inline int mini_set_rtc_time(struct rtc_time *time)
1262 {
1263         unsigned long flags;
1264         int err;
1265
1266         spin_lock_irqsave(&rtc_lock, flags);
1267         err = mini_rtc_ops->set_rtc_time(time);
1268         spin_unlock_irqrestore(&rtc_lock, flags);
1269
1270         return err;
1271 }
1272
1273 static int mini_rtc_ioctl(struct inode *inode, struct file *file,
1274                           unsigned int cmd, unsigned long arg)
1275 {
1276         struct rtc_time wtime;
1277         void __user *argp = (void __user *)arg;
1278
1279         switch (cmd) {
1280
1281         case RTC_PLL_GET:
1282                 return -EINVAL;
1283
1284         case RTC_PLL_SET:
1285                 return -EINVAL;
1286
1287         case RTC_UIE_OFF:       /* disable ints from RTC updates.       */
1288                 return 0;
1289
1290         case RTC_UIE_ON:        /* enable ints for RTC updates. */
1291                 return -EINVAL;
1292
1293         case RTC_RD_TIME:       /* Read the time/date from RTC  */
1294                 /* this doesn't get week-day, who cares */
1295                 memset(&wtime, 0, sizeof(wtime));
1296                 mini_get_rtc_time(&wtime);
1297
1298                 return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
1299
1300         case RTC_SET_TIME:      /* Set the RTC */
1301             {
1302                 int year, days;
1303
1304                 if (!capable(CAP_SYS_TIME))
1305                         return -EACCES;
1306
1307                 if (copy_from_user(&wtime, argp, sizeof(wtime)))
1308                         return -EFAULT;
1309
1310                 year = wtime.tm_year + 1900;
1311                 days = month_days[wtime.tm_mon] +
1312                        ((wtime.tm_mon == 1) && leapyear(year));
1313
1314                 if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
1315                     (wtime.tm_mday < 1))
1316                         return -EINVAL;
1317
1318                 if (wtime.tm_mday < 0 || wtime.tm_mday > days)
1319                         return -EINVAL;
1320
1321                 if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
1322                     wtime.tm_min < 0 || wtime.tm_min >= 60 ||
1323                     wtime.tm_sec < 0 || wtime.tm_sec >= 60)
1324                         return -EINVAL;
1325
1326                 return mini_set_rtc_time(&wtime);
1327             }
1328         }
1329
1330         return -EINVAL;
1331 }
1332
1333 static int mini_rtc_open(struct inode *inode, struct file *file)
1334 {
1335         lock_kernel();
1336         if (mini_rtc_status & RTC_IS_OPEN) {
1337                 unlock_kernel();
1338                 return -EBUSY;
1339         }
1340
1341         mini_rtc_status |= RTC_IS_OPEN;
1342         unlock_kernel();
1343
1344         return 0;
1345 }
1346
1347 static int mini_rtc_release(struct inode *inode, struct file *file)
1348 {
1349         mini_rtc_status &= ~RTC_IS_OPEN;
1350         return 0;
1351 }
1352
1353
1354 static const struct file_operations mini_rtc_fops = {
1355         .owner          = THIS_MODULE,
1356         .ioctl          = mini_rtc_ioctl,
1357         .open           = mini_rtc_open,
1358         .release        = mini_rtc_release,
1359 };
1360
1361 static struct miscdevice rtc_mini_dev =
1362 {
1363         .minor          = RTC_MINOR,
1364         .name           = "rtc",
1365         .fops           = &mini_rtc_fops,
1366 };
1367
1368 static int __init rtc_mini_init(void)
1369 {
1370         int retval;
1371
1372         if (tlb_type == hypervisor)
1373                 mini_rtc_ops = &hypervisor_rtc_ops;
1374         else if (this_is_starfire)
1375                 mini_rtc_ops = &starfire_rtc_ops;
1376         else if (bq4802_regs)
1377                 mini_rtc_ops = &bq4802_rtc_ops;
1378         else
1379                 return -ENODEV;
1380
1381         printk(KERN_INFO "Mini RTC Driver\n");
1382
1383         retval = misc_register(&rtc_mini_dev);
1384         if (retval < 0)
1385                 return retval;
1386
1387         return 0;
1388 }
1389
1390 static void __exit rtc_mini_exit(void)
1391 {
1392         misc_deregister(&rtc_mini_dev);
1393 }
1394
1395 int __devinit read_current_timer(unsigned long *timer_val)
1396 {
1397         *timer_val = tick_ops->get_tick();
1398         return 0;
1399 }
1400
1401 module_init(rtc_mini_init);
1402 module_exit(rtc_mini_exit);