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