arch/sparc/kernel/time_64.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
  56 #define TICK_PRIV_BIT   (1UL << 63)
  57 #define TICKCMP_IRQ_BIT (1UL << 63)
  58
  59 #ifdef CONFIG_SMP
  60 unsigned long profile_pc(struct pt_regs *regs)
  61 {
  62         unsigned long pc = instruction_pointer(regs);
  63
  64         if (in_lock_functions(pc))
  65                 return regs->u_regs[UREG_RETPC];
  66         return pc;
  67 }
  68 EXPORT_SYMBOL(profile_pc);
  69 #endif
  70
  71 static void tick_disable_protection(void)
  72 {
  73         /* Set things up so user can access tick register for profiling
  74          * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
  75          * read back of %tick after writing it.
  76          */
  77         __asm__ __volatile__(
  78         "       ba,pt   %%xcc, 1f\n"
  79         "        nop\n"
  80         "       .align  64\n"
  81         "1:     rd      %%tick, %%g2\n"
  82         "       add     %%g2, 6, %%g2\n"
  83         "       andn    %%g2, %0, %%g2\n"
  84         "       wrpr    %%g2, 0, %%tick\n"
  85         "       rdpr    %%tick, %%g0"
  86         : /* no outputs */
  87         : "r" (TICK_PRIV_BIT)
  88         : "g2");
  89 }
  90
  91 static void tick_disable_irq(void)
  92 {
  93         __asm__ __volatile__(
  94         "       ba,pt   %%xcc, 1f\n"
  95         "        nop\n"
  96         "       .align  64\n"
  97         "1:     wr      %0, 0x0, %%tick_cmpr\n"
  98         "       rd      %%tick_cmpr, %%g0"
  99         : /* no outputs */
 100         : "r" (TICKCMP_IRQ_BIT));
 101 }
 102
 103 static void tick_init_tick(void)
 104 {
 105         tick_disable_protection();
 106         tick_disable_irq();
 107 }
 108
 109 static unsigned long long tick_get_tick(void)
 110 {
 111         unsigned long ret;
 112
 113         __asm__ __volatile__("rd        %%tick, %0\n\t"
 114                              "mov       %0, %0"
 115                              : "=r" (ret));
 116
 117         return ret & ~TICK_PRIV_BIT;
 118 }
 119
 120 static int tick_add_compare(unsigned long adj)
 121 {
 122         unsigned long orig_tick, new_tick, new_compare;
 123
 124         __asm__ __volatile__("rd        %%tick, %0"
 125                              : "=r" (orig_tick));
 126
 127         orig_tick &= ~TICKCMP_IRQ_BIT;
 128
 129         /* Workaround for Spitfire Errata (#54 I think??), I discovered
 130          * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
 131          * number 103640.
 132          *
 133          * On Blackbird writes to %tick_cmpr can fail, the
 134          * workaround seems to be to execute the wr instruction
 135          * at the start of an I-cache line, and perform a dummy
 136          * read back from %tick_cmpr right after writing to it. -DaveM
 137          */
 138         __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t"
 139                              " add      %1, %2, %0\n\t"
 140                              ".align    64\n"
 141                              "1:\n\t"
 142                              "wr        %0, 0, %%tick_cmpr\n\t"
 143                              "rd        %%tick_cmpr, %%g0\n\t"
 144                              : "=r" (new_compare)
 145                              : "r" (orig_tick), "r" (adj));
 146
 147         __asm__ __volatile__("rd        %%tick, %0"
 148                              : "=r" (new_tick));
 149         new_tick &= ~TICKCMP_IRQ_BIT;
 150
 151         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 152 }
 153
 154 static unsigned long tick_add_tick(unsigned long adj)
 155 {
 156         unsigned long new_tick;
 157
 158         /* Also need to handle Blackbird bug here too. */
 159         __asm__ __volatile__("rd        %%tick, %0\n\t"
 160                              "add       %0, %1, %0\n\t"
 161                              "wrpr      %0, 0, %%tick\n\t"
 162                              : "=&r" (new_tick)
 163                              : "r" (adj));
 164
 165         return new_tick;
 166 }
 167
 168 static struct sparc64_tick_ops tick_operations __read_mostly = {
 169         .name           =       "tick",
 170         .init_tick      =       tick_init_tick,
 171         .disable_irq    =       tick_disable_irq,
 172         .get_tick       =       tick_get_tick,
 173         .add_tick       =       tick_add_tick,
 174         .add_compare    =       tick_add_compare,
 175         .softint_mask   =       1UL << 0,
 176 };
 177
 178 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
 179 EXPORT_SYMBOL(tick_ops);
 180
 181 static void stick_disable_irq(void)
 182 {
 183         __asm__ __volatile__(
 184         "wr     %0, 0x0, %%asr25"
 185         : /* no outputs */
 186         : "r" (TICKCMP_IRQ_BIT));
 187 }
 188
 189 static void stick_init_tick(void)
 190 {
 191         /* Writes to the %tick and %stick register are not
 192          * allowed on sun4v.  The Hypervisor controls that
 193          * bit, per-strand.
 194          */
 195         if (tlb_type != hypervisor) {
 196                 tick_disable_protection();
 197                 tick_disable_irq();
 198
 199                 /* Let the user get at STICK too. */
 200                 __asm__ __volatile__(
 201                 "       rd      %%asr24, %%g2\n"
 202                 "       andn    %%g2, %0, %%g2\n"
 203                 "       wr      %%g2, 0, %%asr24"
 204                 : /* no outputs */
 205                 : "r" (TICK_PRIV_BIT)
 206                 : "g1", "g2");
 207         }
 208
 209         stick_disable_irq();
 210 }
 211
 212 static unsigned long long stick_get_tick(void)
 213 {
 214         unsigned long ret;
 215
 216         __asm__ __volatile__("rd        %%asr24, %0"
 217                              : "=r" (ret));
 218
 219         return ret & ~TICK_PRIV_BIT;
 220 }
 221
 222 static unsigned long stick_add_tick(unsigned long adj)
 223 {
 224         unsigned long new_tick;
 225
 226         __asm__ __volatile__("rd        %%asr24, %0\n\t"
 227                              "add       %0, %1, %0\n\t"
 228                              "wr        %0, 0, %%asr24\n\t"
 229                              : "=&r" (new_tick)
 230                              : "r" (adj));
 231
 232         return new_tick;
 233 }
 234
 235 static int stick_add_compare(unsigned long adj)
 236 {
 237         unsigned long orig_tick, new_tick;
 238
 239         __asm__ __volatile__("rd        %%asr24, %0"
 240                              : "=r" (orig_tick));
 241         orig_tick &= ~TICKCMP_IRQ_BIT;
 242
 243         __asm__ __volatile__("wr        %0, 0, %%asr25"
 244                              : /* no outputs */
 245                              : "r" (orig_tick + adj));
 246
 247         __asm__ __volatile__("rd        %%asr24, %0"
 248                              : "=r" (new_tick));
 249         new_tick &= ~TICKCMP_IRQ_BIT;
 250
 251         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 252 }
 253
 254 static struct sparc64_tick_ops stick_operations __read_mostly = {
 255         .name           =       "stick",
 256         .init_tick      =       stick_init_tick,
 257         .disable_irq    =       stick_disable_irq,
 258         .get_tick       =       stick_get_tick,
 259         .add_tick       =       stick_add_tick,
 260         .add_compare    =       stick_add_compare,
 261         .softint_mask   =       1UL << 16,
 262 };
 263
 264 /* On Hummingbird the STICK/STICK_CMPR register is implemented
 265  * in I/O space.  There are two 64-bit registers each, the
 266  * first holds the low 32-bits of the value and the second holds
 267  * the high 32-bits.
 268  *
 269  * Since STICK is constantly updating, we have to access it carefully.
 270  *
 271  * The sequence we use to read is:
 272  * 1) read high
 273  * 2) read low
 274  * 3) read high again, if it rolled re-read both low and high again.
 275  *
 276  * Writing STICK safely is also tricky:
 277  * 1) write low to zero
 278  * 2) write high
 279  * 3) write low
 280  */
 281 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
 282 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
 283
 284 static unsigned long __hbird_read_stick(void)
 285 {
 286         unsigned long ret, tmp1, tmp2, tmp3;
 287         unsigned long addr = HBIRD_STICK_ADDR+8;
 288
 289         __asm__ __volatile__("ldxa      [%1] %5, %2\n"
 290                              "1:\n\t"
 291                              "sub       %1, 0x8, %1\n\t"
 292                              "ldxa      [%1] %5, %3\n\t"
 293                              "add       %1, 0x8, %1\n\t"
 294                              "ldxa      [%1] %5, %4\n\t"
 295                              "cmp       %4, %2\n\t"
 296                              "bne,a,pn  %%xcc, 1b\n\t"
 297                              " mov      %4, %2\n\t"
 298                              "sllx      %4, 32, %4\n\t"
 299                              "or        %3, %4, %0\n\t"
 300                              : "=&r" (ret), "=&r" (addr),
 301                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
 302                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
 303
 304         return ret;
 305 }
 306
 307 static void __hbird_write_stick(unsigned long val)
 308 {
 309         unsigned long low = (val & 0xffffffffUL);
 310         unsigned long high = (val >> 32UL);
 311         unsigned long addr = HBIRD_STICK_ADDR;
 312
 313         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
 314                              "add       %0, 0x8, %0\n\t"
 315                              "stxa      %3, [%0] %4\n\t"
 316                              "sub       %0, 0x8, %0\n\t"
 317                              "stxa      %2, [%0] %4"
 318                              : "=&r" (addr)
 319                              : "0" (addr), "r" (low), "r" (high),
 320                                "i" (ASI_PHYS_BYPASS_EC_E));
 321 }
 322
 323 static void __hbird_write_compare(unsigned long val)
 324 {
 325         unsigned long low = (val & 0xffffffffUL);
 326         unsigned long high = (val >> 32UL);
 327         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
 328
 329         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
 330                              "sub       %0, 0x8, %0\n\t"
 331                              "stxa      %2, [%0] %4"
 332                              : "=&r" (addr)
 333                              : "0" (addr), "r" (low), "r" (high),
 334                                "i" (ASI_PHYS_BYPASS_EC_E));
 335 }
 336
 337 static void hbtick_disable_irq(void)
 338 {
 339         __hbird_write_compare(TICKCMP_IRQ_BIT);
 340 }
 341
 342 static void hbtick_init_tick(void)
 343 {
 344         tick_disable_protection();
 345
 346         /* XXX This seems to be necessary to 'jumpstart' Hummingbird
 347          * XXX into actually sending STICK interrupts.  I think because
 348          * XXX of how we store %tick_cmpr in head.S this somehow resets the
 349          * XXX {TICK + STICK} interrupt mux.  -DaveM
 350          */
 351         __hbird_write_stick(__hbird_read_stick());
 352
 353         hbtick_disable_irq();
 354 }
 355
 356 static unsigned long long hbtick_get_tick(void)
 357 {
 358         return __hbird_read_stick() & ~TICK_PRIV_BIT;
 359 }
 360
 361 static unsigned long hbtick_add_tick(unsigned long adj)
 362 {
 363         unsigned long val;
 364
 365         val = __hbird_read_stick() + adj;
 366         __hbird_write_stick(val);
 367
 368         return val;
 369 }
 370
 371 static int hbtick_add_compare(unsigned long adj)
 372 {
 373         unsigned long val = __hbird_read_stick();
 374         unsigned long val2;
 375
 376         val &= ~TICKCMP_IRQ_BIT;
 377         val += adj;
 378         __hbird_write_compare(val);
 379
 380         val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
 381
 382         return ((long)(val2 - val)) > 0L;
 383 }
 384
 385 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
 386         .name           =       "hbtick",
 387         .init_tick      =       hbtick_init_tick,
 388         .disable_irq    =       hbtick_disable_irq,
 389         .get_tick       =       hbtick_get_tick,
 390         .add_tick       =       hbtick_add_tick,
 391         .add_compare    =       hbtick_add_compare,
 392         .softint_mask   =       1UL << 0,
 393 };
 394
 395 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 396
 397 int update_persistent_clock(struct timespec now)
 398 {
 399         struct rtc_device *rtc = rtc_class_open("rtc0");
 400         int err = -1;
 401
 402         if (rtc) {
 403                 err = rtc_set_mmss(rtc, now.tv_sec);
 404                 rtc_class_close(rtc);
 405         }
 406
 407         return err;
 408 }
 409
 410 unsigned long cmos_regs;
 411 EXPORT_SYMBOL(cmos_regs);
 412
 413 static struct resource rtc_cmos_resource;
 414
 415 static struct platform_device rtc_cmos_device = {
 416         .name           = "rtc_cmos",
 417         .id             = -1,
 418         .resource       = &rtc_cmos_resource,
 419         .num_resources  = 1,
 420 };
 421
 422 static int __devinit rtc_probe(struct of_device *op, const struct of_device_id *match)
 423 {
 424         struct resource *r;
 425
 426         printk(KERN_INFO "%s: RTC regs at 0x%llx\n",
 427                op->node->full_name, op->resource[0].start);
 428
 429         /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
 430          * up a fake resource so that the probe works for all cases.
 431          * When the RTC is behind an ISA bus it will have IORESOURCE_IO
 432          * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
 433          */
 434
 435         r = &rtc_cmos_resource;
 436         r->flags = IORESOURCE_IO;
 437         r->name = op->resource[0].name;
 438         r->start = op->resource[0].start;
 439         r->end = op->resource[0].end;
 440
 441         cmos_regs = op->resource[0].start;
 442         return platform_device_register(&rtc_cmos_device);
 443 }
 444
 445 static struct of_device_id __initdata rtc_match[] = {
 446         {
 447                 .name = "rtc",
 448                 .compatible = "m5819",
 449         },
 450         {
 451                 .name = "rtc",
 452                 .compatible = "isa-m5819p",
 453         },
 454         {
 455                 .name = "rtc",
 456                 .compatible = "isa-m5823p",
 457         },
 458         {
 459                 .name = "rtc",
 460                 .compatible = "ds1287",
 461         },
 462         {},
 463 };
 464
 465 static struct of_platform_driver rtc_driver = {
 466         .match_table    = rtc_match,
 467         .probe          = rtc_probe,
 468         .driver         = {
 469                 .name   = "rtc",
 470         },
 471 };
 472
 473 static struct platform_device rtc_bq4802_device = {
 474         .name           = "rtc-bq4802",
 475         .id             = -1,
 476         .num_resources  = 1,
 477 };
 478
 479 static int __devinit bq4802_probe(struct of_device *op, const struct of_device_id *match)
 480 {
 481
 482         printk(KERN_INFO "%s: BQ4802 regs at 0x%llx\n",
 483                op->node->full_name, op->resource[0].start);
 484
 485         rtc_bq4802_device.resource = &op->resource[0];
 486         return platform_device_register(&rtc_bq4802_device);
 487 }
 488
 489 static struct of_device_id __initdata bq4802_match[] = {
 490         {
 491                 .name = "rtc",
 492                 .compatible = "bq4802",
 493         },
 494         {},
 495 };
 496
 497 static struct of_platform_driver bq4802_driver = {
 498         .match_table    = bq4802_match,
 499         .probe          = bq4802_probe,
 500         .driver         = {
 501                 .name   = "bq4802",
 502         },
 503 };
 504
 505 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 506 {
 507         struct platform_device *pdev = to_platform_device(dev);
 508         void __iomem *regs = (void __iomem *) pdev->resource[0].start;
 509
 510         return readb(regs + ofs);
 511 }
 512
 513 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
 514 {
 515         struct platform_device *pdev = to_platform_device(dev);
 516         void __iomem *regs = (void __iomem *) pdev->resource[0].start;
 517
 518         writeb(val, regs + ofs);
 519 }
 520
 521 static struct m48t59_plat_data m48t59_data = {
 522         .read_byte      = mostek_read_byte,
 523         .write_byte     = mostek_write_byte,
 524 };
 525
 526 static struct platform_device m48t59_rtc = {
 527         .name           = "rtc-m48t59",
 528         .id             = 0,
 529         .num_resources  = 1,
 530         .dev    = {
 531                 .platform_data = &m48t59_data,
 532         },
 533 };
 534
 535 static int __devinit mostek_probe(struct of_device *op, const struct of_device_id *match)
 536 {
 537         struct device_node *dp = op->node;
 538
 539         /* On an Enterprise system there can be multiple mostek clocks.
 540          * We should only match the one that is on the central FHC bus.
 541          */
 542         if (!strcmp(dp->parent->name, "fhc") &&
 543             strcmp(dp->parent->parent->name, "central") != 0)
 544                 return -ENODEV;
 545
 546         printk(KERN_INFO "%s: Mostek regs at 0x%llx\n",
 547                dp->full_name, op->resource[0].start);
 548
 549         m48t59_rtc.resource = &op->resource[0];
 550         return platform_device_register(&m48t59_rtc);
 551 }
 552
 553 static struct of_device_id __initdata mostek_match[] = {
 554         {
 555                 .name = "eeprom",
 556         },
 557         {},
 558 };
 559
 560 static struct of_platform_driver mostek_driver = {
 561         .match_table    = mostek_match,
 562         .probe          = mostek_probe,
 563         .driver         = {
 564                 .name   = "mostek",
 565         },
 566 };
 567
 568 static struct platform_device rtc_sun4v_device = {
 569         .name           = "rtc-sun4v",
 570         .id             = -1,
 571 };
 572
 573 static struct platform_device rtc_starfire_device = {
 574         .name           = "rtc-starfire",
 575         .id             = -1,
 576 };
 577
 578 static int __init clock_init(void)
 579 {
 580         if (this_is_starfire)
 581                 return platform_device_register(&rtc_starfire_device);
 582
 583         if (tlb_type == hypervisor)
 584                 return platform_device_register(&rtc_sun4v_device);
 585
 586         (void) of_register_driver(&rtc_driver, &of_platform_bus_type);
 587         (void) of_register_driver(&mostek_driver, &of_platform_bus_type);
 588         (void) of_register_driver(&bq4802_driver, &of_platform_bus_type);
 589
 590         return 0;
 591 }
 592
 593 /* Must be after subsys_initcall() so that busses are probed.  Must
 594  * be before device_initcall() because things like the RTC driver
 595  * need to see the clock registers.
 596  */
 597 fs_initcall(clock_init);
 598
 599 /* This is gets the master TICK_INT timer going. */
 600 static unsigned long sparc64_init_timers(void)
 601 {
 602         struct device_node *dp;
 603         unsigned long freq;
 604
 605         dp = of_find_node_by_path("/");
 606         if (tlb_type == spitfire) {
 607                 unsigned long ver, manuf, impl;
 608
 609                 __asm__ __volatile__ ("rdpr %%ver, %0"
 610                                       : "=&r" (ver));
 611                 manuf = ((ver >> 48) & 0xffff);
 612                 impl = ((ver >> 32) & 0xffff);
 613                 if (manuf == 0x17 && impl == 0x13) {
 614                         /* Hummingbird, aka Ultra-IIe */
 615                         tick_ops = &hbtick_operations;
 616                         freq = of_getintprop_default(dp, "stick-frequency", 0);
 617                 } else {
 618                         tick_ops = &tick_operations;
 619                         freq = local_cpu_data().clock_tick;
 620                 }
 621         } else {
 622                 tick_ops = &stick_operations;
 623                 freq = of_getintprop_default(dp, "stick-frequency", 0);
 624         }
 625
 626         return freq;
 627 }
 628
 629 struct freq_table {
 630         unsigned long clock_tick_ref;
 631         unsigned int ref_freq;
 632 };
 633 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
 634
 635 unsigned long sparc64_get_clock_tick(unsigned int cpu)
 636 {
 637         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 638
 639         if (ft->clock_tick_ref)
 640                 return ft->clock_tick_ref;
 641         return cpu_data(cpu).clock_tick;
 642 }
 643 EXPORT_SYMBOL(sparc64_get_clock_tick);
 644
 645 #ifdef CONFIG_CPU_FREQ
 646
 647 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 648                                     void *data)
 649 {
 650         struct cpufreq_freqs *freq = data;
 651         unsigned int cpu = freq->cpu;
 652         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 653
 654         if (!ft->ref_freq) {
 655                 ft->ref_freq = freq->old;
 656                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
 657         }
 658         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
 659             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
 660             (val == CPUFREQ_RESUMECHANGE)) {
 661                 cpu_data(cpu).clock_tick =
 662                         cpufreq_scale(ft->clock_tick_ref,
 663                                       ft->ref_freq,
 664                                       freq->new);
 665         }
 666
 667         return 0;
 668 }
 669
 670 static struct notifier_block sparc64_cpufreq_notifier_block = {
 671         .notifier_call  = sparc64_cpufreq_notifier
 672 };
 673
 674 static int __init register_sparc64_cpufreq_notifier(void)
 675 {
 676
 677         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
 678                                   CPUFREQ_TRANSITION_NOTIFIER);
 679         return 0;
 680 }
 681
 682 core_initcall(register_sparc64_cpufreq_notifier);
 683
 684 #endif /* CONFIG_CPU_FREQ */
 685
 686 static int sparc64_next_event(unsigned long delta,
 687                               struct clock_event_device *evt)
 688 {
 689         return tick_ops->add_compare(delta) ? -ETIME : 0;
 690 }
 691
 692 static void sparc64_timer_setup(enum clock_event_mode mode,
 693                                 struct clock_event_device *evt)
 694 {
 695         switch (mode) {
 696         case CLOCK_EVT_MODE_ONESHOT:
 697         case CLOCK_EVT_MODE_RESUME:
 698                 break;
 699
 700         case CLOCK_EVT_MODE_SHUTDOWN:
 701                 tick_ops->disable_irq();
 702                 break;
 703
 704         case CLOCK_EVT_MODE_PERIODIC:
 705         case CLOCK_EVT_MODE_UNUSED:
 706                 WARN_ON(1);
 707                 break;
 708         };
 709 }
 710
 711 static struct clock_event_device sparc64_clockevent = {
 712         .features       = CLOCK_EVT_FEAT_ONESHOT,
 713         .set_mode       = sparc64_timer_setup,
 714         .set_next_event = sparc64_next_event,
 715         .rating         = 100,
 716         .shift          = 30,
 717         .irq            = -1,
 718 };
 719 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
 720
 721 void timer_interrupt(int irq, struct pt_regs *regs)
 722 {
 723         struct pt_regs *old_regs = set_irq_regs(regs);
 724         unsigned long tick_mask = tick_ops->softint_mask;
 725         int cpu = smp_processor_id();
 726         struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
 727
 728         clear_softint(tick_mask);
 729
 730         irq_enter();
 731
 732         kstat_incr_irqs_this_cpu(0, irq_to_desc(0));
 733
 734         if (unlikely(!evt->event_handler)) {
 735                 printk(KERN_WARNING
 736                        "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
 737         } else
 738                 evt->event_handler(evt);
 739
 740         irq_exit();
 741
 742         set_irq_regs(old_regs);
 743 }
 744
 745 void __devinit setup_sparc64_timer(void)
 746 {
 747         struct clock_event_device *sevt;
 748         unsigned long pstate;
 749
 750         /* Guarantee that the following sequences execute
 751          * uninterrupted.
 752          */
 753         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 754                              "wrpr      %0, %1, %%pstate"
 755                              : "=r" (pstate)
 756                              : "i" (PSTATE_IE));
 757
 758         tick_ops->init_tick();
 759
 760         /* Restore PSTATE_IE. */
 761         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 762                              : /* no outputs */
 763                              : "r" (pstate));
 764
 765         sevt = &__get_cpu_var(sparc64_events);
 766
 767         memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
 768         sevt->cpumask = cpumask_of(smp_processor_id());
 769
 770         clockevents_register_device(sevt);
 771 }
 772
 773 #define SPARC64_NSEC_PER_CYC_SHIFT      10UL
 774
 775 static struct clocksource clocksource_tick = {
 776         .rating         = 100,
 777         .mask           = CLOCKSOURCE_MASK(64),
 778         .shift          = 16,
 779         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 780 };
 781
 782 static void __init setup_clockevent_multiplier(unsigned long hz)
 783 {
 784         unsigned long mult, shift = 32;
 785
 786         while (1) {
 787                 mult = div_sc(hz, NSEC_PER_SEC, shift);
 788                 if (mult && (mult >> 32UL) == 0UL)
 789                         break;
 790
 791                 shift--;
 792         }
 793
 794         sparc64_clockevent.shift = shift;
 795         sparc64_clockevent.mult = mult;
 796 }
 797
 798 static unsigned long tb_ticks_per_usec __read_mostly;
 799
 800 void __delay(unsigned long loops)
 801 {
 802         unsigned long bclock, now;
 803
 804         bclock = tick_ops->get_tick();
 805         do {
 806                 now = tick_ops->get_tick();
 807         } while ((now-bclock) < loops);
 808 }
 809 EXPORT_SYMBOL(__delay);
 810
 811 void udelay(unsigned long usecs)
 812 {
 813         __delay(tb_ticks_per_usec * usecs);
 814 }
 815 EXPORT_SYMBOL(udelay);
 816
 817 void __init time_init(void)
 818 {
 819         unsigned long freq = sparc64_init_timers();
 820
 821         tb_ticks_per_usec = freq / USEC_PER_SEC;
 822
 823         timer_ticks_per_nsec_quotient =
 824                 clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
 825
 826         clocksource_tick.name = tick_ops->name;
 827         clocksource_tick.mult =
 828                 clocksource_hz2mult(freq,
 829                                     clocksource_tick.shift);
 830         clocksource_tick.read = tick_ops->get_tick;
 831
 832         printk("clocksource: mult[%x] shift[%d]\n",
 833                clocksource_tick.mult, clocksource_tick.shift);
 834
 835         clocksource_register(&clocksource_tick);
 836
 837         sparc64_clockevent.name = tick_ops->name;
 838
 839         setup_clockevent_multiplier(freq);
 840
 841         sparc64_clockevent.max_delta_ns =
 842                 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
 843         sparc64_clockevent.min_delta_ns =
 844                 clockevent_delta2ns(0xF, &sparc64_clockevent);
 845
 846         printk("clockevent: mult[%lx] shift[%d]\n",
 847                sparc64_clockevent.mult, sparc64_clockevent.shift);
 848
 849         setup_sparc64_timer();
 850 }
 851
 852 unsigned long long sched_clock(void)
 853 {
 854         unsigned long ticks = tick_ops->get_tick();
 855
 856         return (ticks * timer_ticks_per_nsec_quotient)
 857                 >> SPARC64_NSEC_PER_CYC_SHIFT;
 858 }
 859
 860 int __devinit read_current_timer(unsigned long *timer_val)
 861 {
 862         *timer_val = tick_ops->get_tick();
 863         return 0;
 864 }