release/src-rt-6.x.4708/linux/linux-2.6.36/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/kernel.h>
  15 #include <linux/param.h>
  16 #include <linux/string.h>
  17 #include <linux/mm.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/time.h>
  20 #include <linux/timex.h>
  21 #include <linux/init.h>
  22 #include <linux/ioport.h>
  23 #include <linux/mc146818rtc.h>
  24 #include <linux/delay.h>
  25 #include <linux/profile.h>
  26 #include <linux/bcd.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/cpufreq.h>
  29 #include <linux/percpu.h>
  30 #include <linux/miscdevice.h>
  31 #include <linux/rtc.h>
  32 #include <linux/rtc/m48t59.h>
  33 #include <linux/kernel_stat.h>
  34 #include <linux/clockchips.h>
  35 #include <linux/clocksource.h>
  36 #include <linux/of_device.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/ftrace.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         __asm__ __volatile__(
  74         "       ba,pt   %%xcc, 1f\n"
  75         "        nop\n"
  76         "       .align  64\n"
  77         "1:     rd      %%tick, %%g2\n"
  78         "       add     %%g2, 6, %%g2\n"
  79         "       andn    %%g2, %0, %%g2\n"
  80         "       wrpr    %%g2, 0, %%tick\n"
  81         "       rdpr    %%tick, %%g0"
  82         : /* no outputs */
  83         : "r" (TICK_PRIV_BIT)
  84         : "g2");
  85 }
  86
  87 static void tick_disable_irq(void)
  88 {
  89         __asm__ __volatile__(
  90         "       ba,pt   %%xcc, 1f\n"
  91         "        nop\n"
  92         "       .align  64\n"
  93         "1:     wr      %0, 0x0, %%tick_cmpr\n"
  94         "       rd      %%tick_cmpr, %%g0"
  95         : /* no outputs */
  96         : "r" (TICKCMP_IRQ_BIT));
  97 }
  98
  99 static void tick_init_tick(void)
 100 {
 101         tick_disable_protection();
 102         tick_disable_irq();
 103 }
 104
 105 static unsigned long long tick_get_tick(void)
 106 {
 107         unsigned long ret;
 108
 109         __asm__ __volatile__("rd        %%tick, %0\n\t"
 110                              "mov       %0, %0"
 111                              : "=r" (ret));
 112
 113         return ret & ~TICK_PRIV_BIT;
 114 }
 115
 116 static int tick_add_compare(unsigned long adj)
 117 {
 118         unsigned long orig_tick, new_tick, new_compare;
 119
 120         __asm__ __volatile__("rd        %%tick, %0"
 121                              : "=r" (orig_tick));
 122
 123         orig_tick &= ~TICKCMP_IRQ_BIT;
 124
 125         __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t"
 126                              " add      %1, %2, %0\n\t"
 127                              ".align    64\n"
 128                              "1:\n\t"
 129                              "wr        %0, 0, %%tick_cmpr\n\t"
 130                              "rd        %%tick_cmpr, %%g0\n\t"
 131                              : "=r" (new_compare)
 132                              : "r" (orig_tick), "r" (adj));
 133
 134         __asm__ __volatile__("rd        %%tick, %0"
 135                              : "=r" (new_tick));
 136         new_tick &= ~TICKCMP_IRQ_BIT;
 137
 138         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 139 }
 140
 141 static unsigned long tick_add_tick(unsigned long adj)
 142 {
 143         unsigned long new_tick;
 144
 145         /* Also need to handle Blackbird bug here too. */
 146         __asm__ __volatile__("rd        %%tick, %0\n\t"
 147                              "add       %0, %1, %0\n\t"
 148                              "wrpr      %0, 0, %%tick\n\t"
 149                              : "=&r" (new_tick)
 150                              : "r" (adj));
 151
 152         return new_tick;
 153 }
 154
 155 static struct sparc64_tick_ops tick_operations __read_mostly = {
 156         .name           =       "tick",
 157         .init_tick      =       tick_init_tick,
 158         .disable_irq    =       tick_disable_irq,
 159         .get_tick       =       tick_get_tick,
 160         .add_tick       =       tick_add_tick,
 161         .add_compare    =       tick_add_compare,
 162         .softint_mask   =       1UL << 0,
 163 };
 164
 165 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
 166 EXPORT_SYMBOL(tick_ops);
 167
 168 static void stick_disable_irq(void)
 169 {
 170         __asm__ __volatile__(
 171         "wr     %0, 0x0, %%asr25"
 172         : /* no outputs */
 173         : "r" (TICKCMP_IRQ_BIT));
 174 }
 175
 176 static void stick_init_tick(void)
 177 {
 178         /* Writes to the %tick and %stick register are not
 179          * allowed on sun4v.  The Hypervisor controls that
 180          * bit, per-strand.
 181          */
 182         if (tlb_type != hypervisor) {
 183                 tick_disable_protection();
 184                 tick_disable_irq();
 185
 186                 /* Let the user get at STICK too. */
 187                 __asm__ __volatile__(
 188                 "       rd      %%asr24, %%g2\n"
 189                 "       andn    %%g2, %0, %%g2\n"
 190                 "       wr      %%g2, 0, %%asr24"
 191                 : /* no outputs */
 192                 : "r" (TICK_PRIV_BIT)
 193                 : "g1", "g2");
 194         }
 195
 196         stick_disable_irq();
 197 }
 198
 199 static unsigned long long stick_get_tick(void)
 200 {
 201         unsigned long ret;
 202
 203         __asm__ __volatile__("rd        %%asr24, %0"
 204                              : "=r" (ret));
 205
 206         return ret & ~TICK_PRIV_BIT;
 207 }
 208
 209 static unsigned long stick_add_tick(unsigned long adj)
 210 {
 211         unsigned long new_tick;
 212
 213         __asm__ __volatile__("rd        %%asr24, %0\n\t"
 214                              "add       %0, %1, %0\n\t"
 215                              "wr        %0, 0, %%asr24\n\t"
 216                              : "=&r" (new_tick)
 217                              : "r" (adj));
 218
 219         return new_tick;
 220 }
 221
 222 static int stick_add_compare(unsigned long adj)
 223 {
 224         unsigned long orig_tick, new_tick;
 225
 226         __asm__ __volatile__("rd        %%asr24, %0"
 227                              : "=r" (orig_tick));
 228         orig_tick &= ~TICKCMP_IRQ_BIT;
 229
 230         __asm__ __volatile__("wr        %0, 0, %%asr25"
 231                              : /* no outputs */
 232                              : "r" (orig_tick + adj));
 233
 234         __asm__ __volatile__("rd        %%asr24, %0"
 235                              : "=r" (new_tick));
 236         new_tick &= ~TICKCMP_IRQ_BIT;
 237
 238         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 239 }
 240
 241 static struct sparc64_tick_ops stick_operations __read_mostly = {
 242         .name           =       "stick",
 243         .init_tick      =       stick_init_tick,
 244         .disable_irq    =       stick_disable_irq,
 245         .get_tick       =       stick_get_tick,
 246         .add_tick       =       stick_add_tick,
 247         .add_compare    =       stick_add_compare,
 248         .softint_mask   =       1UL << 16,
 249 };
 250
 251 /* On Hummingbird the STICK/STICK_CMPR register is implemented
 252  * in I/O space.  There are two 64-bit registers each, the
 253  * first holds the low 32-bits of the value and the second holds
 254  * the high 32-bits.
 255  *
 256  * Since STICK is constantly updating, we have to access it carefully.
 257  *
 258  * The sequence we use to read is:
 259  * 1) read high
 260  * 2) read low
 261  * 3) read high again, if it rolled re-read both low and high again.
 262  *
 263  * Writing STICK safely is also tricky:
 264  * 1) write low to zero
 265  * 2) write high
 266  * 3) write low
 267  */
 268 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
 269 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
 270
 271 static unsigned long __hbird_read_stick(void)
 272 {
 273         unsigned long ret, tmp1, tmp2, tmp3;
 274         unsigned long addr = HBIRD_STICK_ADDR+8;
 275
 276         __asm__ __volatile__("ldxa      [%1] %5, %2\n"
 277                              "1:\n\t"
 278                              "sub       %1, 0x8, %1\n\t"
 279                              "ldxa      [%1] %5, %3\n\t"
 280                              "add       %1, 0x8, %1\n\t"
 281                              "ldxa      [%1] %5, %4\n\t"
 282                              "cmp       %4, %2\n\t"
 283                              "bne,a,pn  %%xcc, 1b\n\t"
 284                              " mov      %4, %2\n\t"
 285                              "sllx      %4, 32, %4\n\t"
 286                              "or        %3, %4, %0\n\t"
 287                              : "=&r" (ret), "=&r" (addr),
 288                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
 289                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
 290
 291         return ret;
 292 }
 293
 294 static void __hbird_write_stick(unsigned long val)
 295 {
 296         unsigned long low = (val & 0xffffffffUL);
 297         unsigned long high = (val >> 32UL);
 298         unsigned long addr = HBIRD_STICK_ADDR;
 299
 300         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
 301                              "add       %0, 0x8, %0\n\t"
 302                              "stxa      %3, [%0] %4\n\t"
 303                              "sub       %0, 0x8, %0\n\t"
 304                              "stxa      %2, [%0] %4"
 305                              : "=&r" (addr)
 306                              : "0" (addr), "r" (low), "r" (high),
 307                                "i" (ASI_PHYS_BYPASS_EC_E));
 308 }
 309
 310 static void __hbird_write_compare(unsigned long val)
 311 {
 312         unsigned long low = (val & 0xffffffffUL);
 313         unsigned long high = (val >> 32UL);
 314         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
 315
 316         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
 317                              "sub       %0, 0x8, %0\n\t"
 318                              "stxa      %2, [%0] %4"
 319                              : "=&r" (addr)
 320                              : "0" (addr), "r" (low), "r" (high),
 321                                "i" (ASI_PHYS_BYPASS_EC_E));
 322 }
 323
 324 static void hbtick_disable_irq(void)
 325 {
 326         __hbird_write_compare(TICKCMP_IRQ_BIT);
 327 }
 328
 329 static void hbtick_init_tick(void)
 330 {
 331         tick_disable_protection();
 332
 333         __hbird_write_stick(__hbird_read_stick());
 334
 335         hbtick_disable_irq();
 336 }
 337
 338 static unsigned long long hbtick_get_tick(void)
 339 {
 340         return __hbird_read_stick() & ~TICK_PRIV_BIT;
 341 }
 342
 343 static unsigned long hbtick_add_tick(unsigned long adj)
 344 {
 345         unsigned long val;
 346
 347         val = __hbird_read_stick() + adj;
 348         __hbird_write_stick(val);
 349
 350         return val;
 351 }
 352
 353 static int hbtick_add_compare(unsigned long adj)
 354 {
 355         unsigned long val = __hbird_read_stick();
 356         unsigned long val2;
 357
 358         val &= ~TICKCMP_IRQ_BIT;
 359         val += adj;
 360         __hbird_write_compare(val);
 361
 362         val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
 363
 364         return ((long)(val2 - val)) > 0L;
 365 }
 366
 367 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
 368         .name           =       "hbtick",
 369         .init_tick      =       hbtick_init_tick,
 370         .disable_irq    =       hbtick_disable_irq,
 371         .get_tick       =       hbtick_get_tick,
 372         .add_tick       =       hbtick_add_tick,
 373         .add_compare    =       hbtick_add_compare,
 374         .softint_mask   =       1UL << 0,
 375 };
 376
 377 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 378
 379 int update_persistent_clock(struct timespec now)
 380 {
 381         struct rtc_device *rtc = rtc_class_open("rtc0");
 382         int err = -1;
 383
 384         if (rtc) {
 385                 err = rtc_set_mmss(rtc, now.tv_sec);
 386                 rtc_class_close(rtc);
 387         }
 388
 389         return err;
 390 }
 391
 392 unsigned long cmos_regs;
 393 EXPORT_SYMBOL(cmos_regs);
 394
 395 static struct resource rtc_cmos_resource;
 396
 397 static struct platform_device rtc_cmos_device = {
 398         .name           = "rtc_cmos",
 399         .id             = -1,
 400         .resource       = &rtc_cmos_resource,
 401         .num_resources  = 1,
 402 };
 403
 404 static int __devinit rtc_probe(struct platform_device *op, const struct of_device_id *match)
 405 {
 406         struct resource *r;
 407
 408         printk(KERN_INFO "%s: RTC regs at 0x%llx\n",
 409                op->dev.of_node->full_name, op->resource[0].start);
 410
 411         /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
 412          * up a fake resource so that the probe works for all cases.
 413          * When the RTC is behind an ISA bus it will have IORESOURCE_IO
 414          * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
 415          */
 416
 417         r = &rtc_cmos_resource;
 418         r->flags = IORESOURCE_IO;
 419         r->name = op->resource[0].name;
 420         r->start = op->resource[0].start;
 421         r->end = op->resource[0].end;
 422
 423         cmos_regs = op->resource[0].start;
 424         return platform_device_register(&rtc_cmos_device);
 425 }
 426
 427 static struct of_device_id __initdata rtc_match[] = {
 428         {
 429                 .name = "rtc",
 430                 .compatible = "m5819",
 431         },
 432         {
 433                 .name = "rtc",
 434                 .compatible = "isa-m5819p",
 435         },
 436         {
 437                 .name = "rtc",
 438                 .compatible = "isa-m5823p",
 439         },
 440         {
 441                 .name = "rtc",
 442                 .compatible = "ds1287",
 443         },
 444         {},
 445 };
 446
 447 static struct of_platform_driver rtc_driver = {
 448         .probe          = rtc_probe,
 449         .driver = {
 450                 .name = "rtc",
 451                 .owner = THIS_MODULE,
 452                 .of_match_table = rtc_match,
 453         },
 454 };
 455
 456 static struct platform_device rtc_bq4802_device = {
 457         .name           = "rtc-bq4802",
 458         .id             = -1,
 459         .num_resources  = 1,
 460 };
 461
 462 static int __devinit bq4802_probe(struct platform_device *op, const struct of_device_id *match)
 463 {
 464
 465         printk(KERN_INFO "%s: BQ4802 regs at 0x%llx\n",
 466                op->dev.of_node->full_name, op->resource[0].start);
 467
 468         rtc_bq4802_device.resource = &op->resource[0];
 469         return platform_device_register(&rtc_bq4802_device);
 470 }
 471
 472 static struct of_device_id __initdata bq4802_match[] = {
 473         {
 474                 .name = "rtc",
 475                 .compatible = "bq4802",
 476         },
 477         {},
 478 };
 479
 480 static struct of_platform_driver bq4802_driver = {
 481         .probe          = bq4802_probe,
 482         .driver = {
 483                 .name = "bq4802",
 484                 .owner = THIS_MODULE,
 485                 .of_match_table = bq4802_match,
 486         },
 487 };
 488
 489 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 490 {
 491         struct platform_device *pdev = to_platform_device(dev);
 492         void __iomem *regs = (void __iomem *) pdev->resource[0].start;
 493
 494         return readb(regs + ofs);
 495 }
 496
 497 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
 498 {
 499         struct platform_device *pdev = to_platform_device(dev);
 500         void __iomem *regs = (void __iomem *) pdev->resource[0].start;
 501
 502         writeb(val, regs + ofs);
 503 }
 504
 505 static struct m48t59_plat_data m48t59_data = {
 506         .read_byte      = mostek_read_byte,
 507         .write_byte     = mostek_write_byte,
 508 };
 509
 510 static struct platform_device m48t59_rtc = {
 511         .name           = "rtc-m48t59",
 512         .id             = 0,
 513         .num_resources  = 1,
 514         .dev    = {
 515                 .platform_data = &m48t59_data,
 516         },
 517 };
 518
 519 static int __devinit mostek_probe(struct platform_device *op, const struct of_device_id *match)
 520 {
 521         struct device_node *dp = op->dev.of_node;
 522
 523         /* On an Enterprise system there can be multiple mostek clocks.
 524          * We should only match the one that is on the central FHC bus.
 525          */
 526         if (!strcmp(dp->parent->name, "fhc") &&
 527             strcmp(dp->parent->parent->name, "central") != 0)
 528                 return -ENODEV;
 529
 530         printk(KERN_INFO "%s: Mostek regs at 0x%llx\n",
 531                dp->full_name, op->resource[0].start);
 532
 533         m48t59_rtc.resource = &op->resource[0];
 534         return platform_device_register(&m48t59_rtc);
 535 }
 536
 537 static struct of_device_id __initdata mostek_match[] = {
 538         {
 539                 .name = "eeprom",
 540         },
 541         {},
 542 };
 543
 544 static struct of_platform_driver mostek_driver = {
 545         .probe          = mostek_probe,
 546         .driver = {
 547                 .name = "mostek",
 548                 .owner = THIS_MODULE,
 549                 .of_match_table = mostek_match,
 550         },
 551 };
 552
 553 static struct platform_device rtc_sun4v_device = {
 554         .name           = "rtc-sun4v",
 555         .id             = -1,
 556 };
 557
 558 static struct platform_device rtc_starfire_device = {
 559         .name           = "rtc-starfire",
 560         .id             = -1,
 561 };
 562
 563 static int __init clock_init(void)
 564 {
 565         if (this_is_starfire)
 566                 return platform_device_register(&rtc_starfire_device);
 567
 568         if (tlb_type == hypervisor)
 569                 return platform_device_register(&rtc_sun4v_device);
 570
 571         (void) of_register_platform_driver(&rtc_driver);
 572         (void) of_register_platform_driver(&mostek_driver);
 573         (void) of_register_platform_driver(&bq4802_driver);
 574
 575         return 0;
 576 }
 577
 578 /* Must be after subsys_initcall() so that busses are probed.  Must
 579  * be before device_initcall() because things like the RTC driver
 580  * need to see the clock registers.
 581  */
 582 fs_initcall(clock_init);
 583
 584 /* This is gets the master TICK_INT timer going. */
 585 static unsigned long sparc64_init_timers(void)
 586 {
 587         struct device_node *dp;
 588         unsigned long freq;
 589
 590         dp = of_find_node_by_path("/");
 591         if (tlb_type == spitfire) {
 592                 unsigned long ver, manuf, impl;
 593
 594                 __asm__ __volatile__ ("rdpr %%ver, %0"
 595                                       : "=&r" (ver));
 596                 manuf = ((ver >> 48) & 0xffff);
 597                 impl = ((ver >> 32) & 0xffff);
 598                 if (manuf == 0x17 && impl == 0x13) {
 599                         /* Hummingbird, aka Ultra-IIe */
 600                         tick_ops = &hbtick_operations;
 601                         freq = of_getintprop_default(dp, "stick-frequency", 0);
 602                 } else {
 603                         tick_ops = &tick_operations;
 604                         freq = local_cpu_data().clock_tick;
 605                 }
 606         } else {
 607                 tick_ops = &stick_operations;
 608                 freq = of_getintprop_default(dp, "stick-frequency", 0);
 609         }
 610
 611         return freq;
 612 }
 613
 614 struct freq_table {
 615         unsigned long clock_tick_ref;
 616         unsigned int ref_freq;
 617 };
 618 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
 619
 620 unsigned long sparc64_get_clock_tick(unsigned int cpu)
 621 {
 622         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 623
 624         if (ft->clock_tick_ref)
 625                 return ft->clock_tick_ref;
 626         return cpu_data(cpu).clock_tick;
 627 }
 628 EXPORT_SYMBOL(sparc64_get_clock_tick);
 629
 630 #ifdef CONFIG_CPU_FREQ
 631
 632 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 633                                     void *data)
 634 {
 635         struct cpufreq_freqs *freq = data;
 636         unsigned int cpu = freq->cpu;
 637         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 638
 639         if (!ft->ref_freq) {
 640                 ft->ref_freq = freq->old;
 641                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
 642         }
 643         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
 644             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
 645             (val == CPUFREQ_RESUMECHANGE)) {
 646                 cpu_data(cpu).clock_tick =
 647                         cpufreq_scale(ft->clock_tick_ref,
 648                                       ft->ref_freq,
 649                                       freq->new);
 650         }
 651
 652         return 0;
 653 }
 654
 655 static struct notifier_block sparc64_cpufreq_notifier_block = {
 656         .notifier_call  = sparc64_cpufreq_notifier
 657 };
 658
 659 static int __init register_sparc64_cpufreq_notifier(void)
 660 {
 661
 662         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
 663                                   CPUFREQ_TRANSITION_NOTIFIER);
 664         return 0;
 665 }
 666
 667 core_initcall(register_sparc64_cpufreq_notifier);
 668
 669 #endif /* CONFIG_CPU_FREQ */
 670
 671 static int sparc64_next_event(unsigned long delta,
 672                               struct clock_event_device *evt)
 673 {
 674         return tick_ops->add_compare(delta) ? -ETIME : 0;
 675 }
 676
 677 static void sparc64_timer_setup(enum clock_event_mode mode,
 678                                 struct clock_event_device *evt)
 679 {
 680         switch (mode) {
 681         case CLOCK_EVT_MODE_ONESHOT:
 682         case CLOCK_EVT_MODE_RESUME:
 683                 break;
 684
 685         case CLOCK_EVT_MODE_SHUTDOWN:
 686                 tick_ops->disable_irq();
 687                 break;
 688
 689         case CLOCK_EVT_MODE_PERIODIC:
 690         case CLOCK_EVT_MODE_UNUSED:
 691                 WARN_ON(1);
 692                 break;
 693         };
 694 }
 695
 696 static struct clock_event_device sparc64_clockevent = {
 697         .features       = CLOCK_EVT_FEAT_ONESHOT,
 698         .set_mode       = sparc64_timer_setup,
 699         .set_next_event = sparc64_next_event,
 700         .rating         = 100,
 701         .shift          = 30,
 702         .irq            = -1,
 703 };
 704 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
 705
 706 void __irq_entry timer_interrupt(int irq, struct pt_regs *regs)
 707 {
 708         struct pt_regs *old_regs = set_irq_regs(regs);
 709         unsigned long tick_mask = tick_ops->softint_mask;
 710         int cpu = smp_processor_id();
 711         struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
 712
 713         clear_softint(tick_mask);
 714
 715         irq_enter();
 716
 717         local_cpu_data().irq0_irqs++;
 718         kstat_incr_irqs_this_cpu(0, irq_to_desc(0));
 719
 720         if (unlikely(!evt->event_handler)) {
 721                 printk(KERN_WARNING
 722                        "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
 723         } else
 724                 evt->event_handler(evt);
 725
 726         irq_exit();
 727
 728         set_irq_regs(old_regs);
 729 }
 730
 731 void __devinit setup_sparc64_timer(void)
 732 {
 733         struct clock_event_device *sevt;
 734         unsigned long pstate;
 735
 736         /* Guarantee that the following sequences execute
 737          * uninterrupted.
 738          */
 739         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 740                              "wrpr      %0, %1, %%pstate"
 741                              : "=r" (pstate)
 742                              : "i" (PSTATE_IE));
 743
 744         tick_ops->init_tick();
 745
 746         /* Restore PSTATE_IE. */
 747         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 748                              : /* no outputs */
 749                              : "r" (pstate));
 750
 751         sevt = &__get_cpu_var(sparc64_events);
 752
 753         memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
 754         sevt->cpumask = cpumask_of(smp_processor_id());
 755
 756         clockevents_register_device(sevt);
 757 }
 758
 759 #define SPARC64_NSEC_PER_CYC_SHIFT      10UL
 760
 761 static struct clocksource clocksource_tick = {
 762         .rating         = 100,
 763         .mask           = CLOCKSOURCE_MASK(64),
 764         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 765 };
 766
 767 static unsigned long tb_ticks_per_usec __read_mostly;
 768
 769 void __delay(unsigned long loops)
 770 {
 771         unsigned long bclock, now;
 772
 773         bclock = tick_ops->get_tick();
 774         do {
 775                 now = tick_ops->get_tick();
 776         } while ((now-bclock) < loops);
 777 }
 778 EXPORT_SYMBOL(__delay);
 779
 780 void udelay(unsigned long usecs)
 781 {
 782         __delay(tb_ticks_per_usec * usecs);
 783 }
 784 EXPORT_SYMBOL(udelay);
 785
 786 static cycle_t clocksource_tick_read(struct clocksource *cs)
 787 {
 788         return tick_ops->get_tick();
 789 }
 790
 791 void __init time_init(void)
 792 {
 793         unsigned long freq = sparc64_init_timers();
 794
 795         tb_ticks_per_usec = freq / USEC_PER_SEC;
 796
 797         timer_ticks_per_nsec_quotient =
 798                 clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
 799
 800         clocksource_tick.name = tick_ops->name;
 801         clocksource_calc_mult_shift(&clocksource_tick, freq, 4);
 802         clocksource_tick.read = clocksource_tick_read;
 803
 804         printk("clocksource: mult[%x] shift[%d]\n",
 805                clocksource_tick.mult, clocksource_tick.shift);
 806
 807         clocksource_register(&clocksource_tick);
 808
 809         sparc64_clockevent.name = tick_ops->name;
 810         clockevents_calc_mult_shift(&sparc64_clockevent, freq, 4);
 811
 812         sparc64_clockevent.max_delta_ns =
 813                 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
 814         sparc64_clockevent.min_delta_ns =
 815                 clockevent_delta2ns(0xF, &sparc64_clockevent);
 816
 817         printk("clockevent: mult[%x] shift[%d]\n",
 818                sparc64_clockevent.mult, sparc64_clockevent.shift);
 819
 820         setup_sparc64_timer();
 821 }
 822
 823 unsigned long long sched_clock(void)
 824 {
 825         unsigned long ticks = tick_ops->get_tick();
 826
 827         return (ticks * timer_ticks_per_nsec_quotient)
 828                 >> SPARC64_NSEC_PER_CYC_SHIFT;
 829 }
 830
 831 int __devinit read_current_timer(unsigned long *timer_val)
 832 {
 833         *timer_val = tick_ops->get_tick();
 834         return 0;
 835 }