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/export.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/m48t59.h> 32 #include <linux/kernel_stat.h> 33 #include <linux/clockchips.h> 34 #include <linux/clocksource.h> 35 #include <linux/of_device.h> 36 #include <linux/platform_device.h> 37 #include <linux/ftrace.h> 38 39 #include <asm/oplib.h> 40 #include <asm/timer.h> 41 #include <asm/irq.h> 42 #include <asm/io.h> 43 #include <asm/prom.h> 44 #include <asm/starfire.h> 45 #include <asm/smp.h> 46 #include <asm/sections.h> 47 #include <asm/cpudata.h> 48 #include <asm/uaccess.h> 49 #include <asm/irq_regs.h> 50 51 #include "entry.h" 52 53 DEFINE_SPINLOCK(rtc_lock); 54 55 #define TICK_PRIV_BIT (1UL << 63) 56 #define TICKCMP_IRQ_BIT (1UL << 63) 57 58 #ifdef CONFIG_SMP 59 unsigned long profile_pc(struct pt_regs *regs) 60 { 61 unsigned long pc = instruction_pointer(regs); 62 63 if (in_lock_functions(pc)) 64 return regs->u_regs[UREG_RETPC]; 65 return pc; 66 } 67 EXPORT_SYMBOL(profile_pc); 68 #endif 69 70 static void tick_disable_protection(void) 71 { 72 /* Set things up so user can access tick register for profiling 73 * purposes. Also workaround BB_ERRATA_1 by doing a dummy 74 * read back of %tick after writing it. 75 */ 76 __asm__ __volatile__( 77 " ba,pt %%xcc, 1f\n" 78 " nop\n" 79 " .align 64\n" 80 "1: rd %%tick, %%g2\n" 81 " add %%g2, 6, %%g2\n" 82 " andn %%g2, %0, %%g2\n" 83 " wrpr %%g2, 0, %%tick\n" 84 " rdpr %%tick, %%g0" 85 : /* no outputs */ 86 : "r" (TICK_PRIV_BIT) 87 : "g2"); 88 } 89 90 static void tick_disable_irq(void) 91 { 92 __asm__ __volatile__( 93 " ba,pt %%xcc, 1f\n" 94 " nop\n" 95 " .align 64\n" 96 "1: wr %0, 0x0, %%tick_cmpr\n" 97 " rd %%tick_cmpr, %%g0" 98 : /* no outputs */ 99 : "r" (TICKCMP_IRQ_BIT)); 100 } 101 102 static void tick_init_tick(void) 103 { 104 tick_disable_protection(); 105 tick_disable_irq(); 106 } 107 108 static unsigned long long tick_get_tick(void) 109 { 110 unsigned long ret; 111 112 __asm__ __volatile__("rd %%tick, %0\n\t" 113 "mov %0, %0" 114 : "=r" (ret)); 115 116 return ret & ~TICK_PRIV_BIT; 117 } 118 119 static int tick_add_compare(unsigned long adj) 120 { 121 unsigned long orig_tick, new_tick, new_compare; 122 123 __asm__ __volatile__("rd %%tick, %0" 124 : "=r" (orig_tick)); 125 126 orig_tick &= ~TICKCMP_IRQ_BIT; 127 128 /* Workaround for Spitfire Errata (#54 I think??), I discovered 129 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch 130 * number 103640. 131 * 132 * On Blackbird writes to %tick_cmpr can fail, the 133 * workaround seems to be to execute the wr instruction 134 * at the start of an I-cache line, and perform a dummy 135 * read back from %tick_cmpr right after writing to it. -DaveM 136 */ 137 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" 138 " add %1, %2, %0\n\t" 139 ".align 64\n" 140 "1:\n\t" 141 "wr %0, 0, %%tick_cmpr\n\t" 142 "rd %%tick_cmpr, %%g0\n\t" 143 : "=r" (new_compare) 144 : "r" (orig_tick), "r" (adj)); 145 146 __asm__ __volatile__("rd %%tick, %0" 147 : "=r" (new_tick)); 148 new_tick &= ~TICKCMP_IRQ_BIT; 149 150 return ((long)(new_tick - (orig_tick+adj))) > 0L; 151 } 152 153 static unsigned long tick_add_tick(unsigned long adj) 154 { 155 unsigned long new_tick; 156 157 /* Also need to handle Blackbird bug here too. */ 158 __asm__ __volatile__("rd %%tick, %0\n\t" 159 "add %0, %1, %0\n\t" 160 "wrpr %0, 0, %%tick\n\t" 161 : "=&r" (new_tick) 162 : "r" (adj)); 163 164 return new_tick; 165 } 166 167 static struct sparc64_tick_ops tick_operations __read_mostly = { 168 .name = "tick", 169 .init_tick = tick_init_tick, 170 .disable_irq = tick_disable_irq, 171 .get_tick = tick_get_tick, 172 .add_tick = tick_add_tick, 173 .add_compare = tick_add_compare, 174 .softint_mask = 1UL << 0, 175 }; 176 177 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations; 178 EXPORT_SYMBOL(tick_ops); 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 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 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 unsigned long cmos_regs; 397 EXPORT_SYMBOL(cmos_regs); 398 399 static struct resource rtc_cmos_resource; 400 401 static struct platform_device rtc_cmos_device = { 402 .name = "rtc_cmos", 403 .id = -1, 404 .resource = &rtc_cmos_resource, 405 .num_resources = 1, 406 }; 407 408 static int rtc_probe(struct platform_device *op) 409 { 410 struct resource *r; 411 412 printk(KERN_INFO "%s: RTC regs at 0x%llx\n", 413 op->dev.of_node->full_name, op->resource[0].start); 414 415 /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons 416 * up a fake resource so that the probe works for all cases. 417 * When the RTC is behind an ISA bus it will have IORESOURCE_IO 418 * already, whereas when it's behind EBUS is will be IORESOURCE_MEM. 419 */ 420 421 r = &rtc_cmos_resource; 422 r->flags = IORESOURCE_IO; 423 r->name = op->resource[0].name; 424 r->start = op->resource[0].start; 425 r->end = op->resource[0].end; 426 427 cmos_regs = op->resource[0].start; 428 return platform_device_register(&rtc_cmos_device); 429 } 430 431 static const struct of_device_id rtc_match[] = { 432 { 433 .name = "rtc", 434 .compatible = "m5819", 435 }, 436 { 437 .name = "rtc", 438 .compatible = "isa-m5819p", 439 }, 440 { 441 .name = "rtc", 442 .compatible = "isa-m5823p", 443 }, 444 { 445 .name = "rtc", 446 .compatible = "ds1287", 447 }, 448 {}, 449 }; 450 451 static struct platform_driver rtc_driver = { 452 .probe = rtc_probe, 453 .driver = { 454 .name = "rtc", 455 .of_match_table = rtc_match, 456 }, 457 }; 458 459 static struct platform_device rtc_bq4802_device = { 460 .name = "rtc-bq4802", 461 .id = -1, 462 .num_resources = 1, 463 }; 464 465 static int bq4802_probe(struct platform_device *op) 466 { 467 468 printk(KERN_INFO "%s: BQ4802 regs at 0x%llx\n", 469 op->dev.of_node->full_name, op->resource[0].start); 470 471 rtc_bq4802_device.resource = &op->resource[0]; 472 return platform_device_register(&rtc_bq4802_device); 473 } 474 475 static const struct of_device_id bq4802_match[] = { 476 { 477 .name = "rtc", 478 .compatible = "bq4802", 479 }, 480 {}, 481 }; 482 483 static struct platform_driver bq4802_driver = { 484 .probe = bq4802_probe, 485 .driver = { 486 .name = "bq4802", 487 .of_match_table = bq4802_match, 488 }, 489 }; 490 491 static unsigned char mostek_read_byte(struct device *dev, u32 ofs) 492 { 493 struct platform_device *pdev = to_platform_device(dev); 494 void __iomem *regs = (void __iomem *) pdev->resource[0].start; 495 496 return readb(regs + ofs); 497 } 498 499 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val) 500 { 501 struct platform_device *pdev = to_platform_device(dev); 502 void __iomem *regs = (void __iomem *) pdev->resource[0].start; 503 504 writeb(val, regs + ofs); 505 } 506 507 static struct m48t59_plat_data m48t59_data = { 508 .read_byte = mostek_read_byte, 509 .write_byte = mostek_write_byte, 510 }; 511 512 static struct platform_device m48t59_rtc = { 513 .name = "rtc-m48t59", 514 .id = 0, 515 .num_resources = 1, 516 .dev = { 517 .platform_data = &m48t59_data, 518 }, 519 }; 520 521 static int mostek_probe(struct platform_device *op) 522 { 523 struct device_node *dp = op->dev.of_node; 524 525 /* On an Enterprise system there can be multiple mostek clocks. 526 * We should only match the one that is on the central FHC bus. 527 */ 528 if (!strcmp(dp->parent->name, "fhc") && 529 strcmp(dp->parent->parent->name, "central") != 0) 530 return -ENODEV; 531 532 printk(KERN_INFO "%s: Mostek regs at 0x%llx\n", 533 dp->full_name, op->resource[0].start); 534 535 m48t59_rtc.resource = &op->resource[0]; 536 return platform_device_register(&m48t59_rtc); 537 } 538 539 static const struct of_device_id mostek_match[] = { 540 { 541 .name = "eeprom", 542 }, 543 {}, 544 }; 545 546 static struct platform_driver mostek_driver = { 547 .probe = mostek_probe, 548 .driver = { 549 .name = "mostek", 550 .of_match_table = mostek_match, 551 }, 552 }; 553 554 static struct platform_device rtc_sun4v_device = { 555 .name = "rtc-sun4v", 556 .id = -1, 557 }; 558 559 static struct platform_device rtc_starfire_device = { 560 .name = "rtc-starfire", 561 .id = -1, 562 }; 563 564 static int __init clock_init(void) 565 { 566 if (this_is_starfire) 567 return platform_device_register(&rtc_starfire_device); 568 569 if (tlb_type == hypervisor) 570 return platform_device_register(&rtc_sun4v_device); 571 572 (void) platform_driver_register(&rtc_driver); 573 (void) platform_driver_register(&mostek_driver); 574 (void) platform_driver_register(&bq4802_driver); 575 576 return 0; 577 } 578 579 /* Must be after subsys_initcall() so that busses are probed. Must 580 * be before device_initcall() because things like the RTC driver 581 * need to see the clock registers. 582 */ 583 fs_initcall(clock_init); 584 585 /* This is gets the master TICK_INT timer going. */ 586 static unsigned long sparc64_init_timers(void) 587 { 588 struct device_node *dp; 589 unsigned long freq; 590 591 dp = of_find_node_by_path("/"); 592 if (tlb_type == spitfire) { 593 unsigned long ver, manuf, impl; 594 595 __asm__ __volatile__ ("rdpr %%ver, %0" 596 : "=&r" (ver)); 597 manuf = ((ver >> 48) & 0xffff); 598 impl = ((ver >> 32) & 0xffff); 599 if (manuf == 0x17 && impl == 0x13) { 600 /* Hummingbird, aka Ultra-IIe */ 601 tick_ops = &hbtick_operations; 602 freq = of_getintprop_default(dp, "stick-frequency", 0); 603 } else { 604 tick_ops = &tick_operations; 605 freq = local_cpu_data().clock_tick; 606 } 607 } else { 608 tick_ops = &stick_operations; 609 freq = of_getintprop_default(dp, "stick-frequency", 0); 610 } 611 612 return freq; 613 } 614 615 struct freq_table { 616 unsigned long clock_tick_ref; 617 unsigned int ref_freq; 618 }; 619 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 }; 620 621 unsigned long sparc64_get_clock_tick(unsigned int cpu) 622 { 623 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); 624 625 if (ft->clock_tick_ref) 626 return ft->clock_tick_ref; 627 return cpu_data(cpu).clock_tick; 628 } 629 EXPORT_SYMBOL(sparc64_get_clock_tick); 630 631 #ifdef CONFIG_CPU_FREQ 632 633 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 634 void *data) 635 { 636 struct cpufreq_freqs *freq = data; 637 unsigned int cpu = freq->cpu; 638 struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); 639 640 if (!ft->ref_freq) { 641 ft->ref_freq = freq->old; 642 ft->clock_tick_ref = cpu_data(cpu).clock_tick; 643 } 644 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || 645 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) { 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 int sparc64_timer_shutdown(struct clock_event_device *evt) 678 { 679 tick_ops->disable_irq(); 680 return 0; 681 } 682 683 static struct clock_event_device sparc64_clockevent = { 684 .features = CLOCK_EVT_FEAT_ONESHOT, 685 .set_state_shutdown = sparc64_timer_shutdown, 686 .set_next_event = sparc64_next_event, 687 .rating = 100, 688 .shift = 30, 689 .irq = -1, 690 }; 691 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events); 692 693 void __irq_entry timer_interrupt(int irq, struct pt_regs *regs) 694 { 695 struct pt_regs *old_regs = set_irq_regs(regs); 696 unsigned long tick_mask = tick_ops->softint_mask; 697 int cpu = smp_processor_id(); 698 struct clock_event_device *evt = &per_cpu(sparc64_events, cpu); 699 700 clear_softint(tick_mask); 701 702 irq_enter(); 703 704 local_cpu_data().irq0_irqs++; 705 kstat_incr_irq_this_cpu(0); 706 707 if (unlikely(!evt->event_handler)) { 708 printk(KERN_WARNING 709 "Spurious SPARC64 timer interrupt on cpu %d\n", cpu); 710 } else 711 evt->event_handler(evt); 712 713 irq_exit(); 714 715 set_irq_regs(old_regs); 716 } 717 718 void setup_sparc64_timer(void) 719 { 720 struct clock_event_device *sevt; 721 unsigned long pstate; 722 723 /* Guarantee that the following sequences execute 724 * uninterrupted. 725 */ 726 __asm__ __volatile__("rdpr %%pstate, %0\n\t" 727 "wrpr %0, %1, %%pstate" 728 : "=r" (pstate) 729 : "i" (PSTATE_IE)); 730 731 tick_ops->init_tick(); 732 733 /* Restore PSTATE_IE. */ 734 __asm__ __volatile__("wrpr %0, 0x0, %%pstate" 735 : /* no outputs */ 736 : "r" (pstate)); 737 738 sevt = this_cpu_ptr(&sparc64_events); 739 740 memcpy(sevt, &sparc64_clockevent, sizeof(*sevt)); 741 sevt->cpumask = cpumask_of(smp_processor_id()); 742 743 clockevents_register_device(sevt); 744 } 745 746 #define SPARC64_NSEC_PER_CYC_SHIFT 10UL 747 748 static struct clocksource clocksource_tick = { 749 .rating = 100, 750 .mask = CLOCKSOURCE_MASK(64), 751 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 752 }; 753 754 static unsigned long tb_ticks_per_usec __read_mostly; 755 756 void __delay(unsigned long loops) 757 { 758 unsigned long bclock, now; 759 760 bclock = tick_ops->get_tick(); 761 do { 762 now = tick_ops->get_tick(); 763 } while ((now-bclock) < loops); 764 } 765 EXPORT_SYMBOL(__delay); 766 767 void udelay(unsigned long usecs) 768 { 769 __delay(tb_ticks_per_usec * usecs); 770 } 771 EXPORT_SYMBOL(udelay); 772 773 static cycle_t clocksource_tick_read(struct clocksource *cs) 774 { 775 return tick_ops->get_tick(); 776 } 777 778 void __init time_init(void) 779 { 780 unsigned long freq = sparc64_init_timers(); 781 782 tb_ticks_per_usec = freq / USEC_PER_SEC; 783 784 timer_ticks_per_nsec_quotient = 785 clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT); 786 787 clocksource_tick.name = tick_ops->name; 788 clocksource_tick.read = clocksource_tick_read; 789 790 clocksource_register_hz(&clocksource_tick, freq); 791 printk("clocksource: mult[%x] shift[%d]\n", 792 clocksource_tick.mult, clocksource_tick.shift); 793 794 sparc64_clockevent.name = tick_ops->name; 795 clockevents_calc_mult_shift(&sparc64_clockevent, freq, 4); 796 797 sparc64_clockevent.max_delta_ns = 798 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent); 799 sparc64_clockevent.min_delta_ns = 800 clockevent_delta2ns(0xF, &sparc64_clockevent); 801 802 printk("clockevent: mult[%x] shift[%d]\n", 803 sparc64_clockevent.mult, sparc64_clockevent.shift); 804 805 setup_sparc64_timer(); 806 } 807 808 unsigned long long sched_clock(void) 809 { 810 unsigned long ticks = tick_ops->get_tick(); 811 812 return (ticks * timer_ticks_per_nsec_quotient) 813 >> SPARC64_NSEC_PER_CYC_SHIFT; 814 } 815 816 int read_current_timer(unsigned long *timer_val) 817 { 818 *timer_val = tick_ops->get_tick(); 819 return 0; 820 } 821