Merge branches 'cpus4096', 'x86/cleanups' and 'x86/urgent' into x86/percpu
[linux-2.6.git] / 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 }