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35#include <linux/errno.h>
36#include <linux/module.h>
37#include <linux/sched.h>
38#include <linux/kernel.h>
39#include <linux/param.h>
40#include <linux/string.h>
41#include <linux/mm.h>
42#include <linux/interrupt.h>
43#include <linux/timex.h>
44#include <linux/kernel_stat.h>
45#include <linux/time.h>
46#include <linux/init.h>
47#include <linux/profile.h>
48#include <linux/cpu.h>
49#include <linux/security.h>
50#include <linux/percpu.h>
51#include <linux/rtc.h>
52#include <linux/jiffies.h>
53#include <linux/posix-timers.h>
54#include <linux/irq.h>
55#include <linux/delay.h>
56#include <linux/perf_event.h>
57
58#include <asm/io.h>
59#include <asm/processor.h>
60#include <asm/nvram.h>
61#include <asm/cache.h>
62#include <asm/machdep.h>
63#include <asm/uaccess.h>
64#include <asm/time.h>
65#include <asm/prom.h>
66#include <asm/irq.h>
67#include <asm/div64.h>
68#include <asm/smp.h>
69#include <asm/vdso_datapage.h>
70#include <asm/firmware.h>
71#include <asm/cputime.h>
72#ifdef CONFIG_PPC_ISERIES
73#include <asm/iseries/it_lp_queue.h>
74#include <asm/iseries/hv_call_xm.h>
75#endif
76
77
78
79#include <linux/clockchips.h>
80#include <linux/clocksource.h>
81
82static cycle_t rtc_read(struct clocksource *);
83static struct clocksource clocksource_rtc = {
84 .name = "rtc",
85 .rating = 400,
86 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
87 .mask = CLOCKSOURCE_MASK(64),
88 .shift = 22,
89 .mult = 0,
90 .read = rtc_read,
91};
92
93static cycle_t timebase_read(struct clocksource *);
94static struct clocksource clocksource_timebase = {
95 .name = "timebase",
96 .rating = 400,
97 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
98 .mask = CLOCKSOURCE_MASK(64),
99 .shift = 22,
100 .mult = 0,
101 .read = timebase_read,
102};
103
104#define DECREMENTER_MAX 0x7fffffff
105
106static int decrementer_set_next_event(unsigned long evt,
107 struct clock_event_device *dev);
108static void decrementer_set_mode(enum clock_event_mode mode,
109 struct clock_event_device *dev);
110
111static struct clock_event_device decrementer_clockevent = {
112 .name = "decrementer",
113 .rating = 200,
114 .shift = 0,
115 .mult = 0,
116 .irq = 0,
117 .set_next_event = decrementer_set_next_event,
118 .set_mode = decrementer_set_mode,
119 .features = CLOCK_EVT_FEAT_ONESHOT,
120};
121
122struct decrementer_clock {
123 struct clock_event_device event;
124 u64 next_tb;
125};
126
127static DEFINE_PER_CPU(struct decrementer_clock, decrementers);
128
129#ifdef CONFIG_PPC_ISERIES
130static unsigned long __initdata iSeries_recal_titan;
131static signed long __initdata iSeries_recal_tb;
132
133
134static void __init clocksource_init(void);
135#endif
136
137#define XSEC_PER_SEC (1024*1024)
138
139#ifdef CONFIG_PPC64
140#define SCALE_XSEC(xsec, max) (((xsec) * max) / XSEC_PER_SEC)
141#else
142
143#define SCALE_XSEC(xsec, max) mulhwu((xsec) << 12, max)
144#endif
145
146unsigned long tb_ticks_per_jiffy;
147unsigned long tb_ticks_per_usec = 100;
148EXPORT_SYMBOL(tb_ticks_per_usec);
149unsigned long tb_ticks_per_sec;
150EXPORT_SYMBOL(tb_ticks_per_sec);
151u64 tb_to_xs;
152unsigned tb_to_us;
153
154#define TICKLEN_SCALE NTP_SCALE_SHIFT
155static u64 last_tick_len;
156static u64 ticklen_to_xs;
157
158
159
160#define TICKLEN_SHIFT (63 - 30 - TICKLEN_SCALE + SHIFT_HZ)
161
162DEFINE_SPINLOCK(rtc_lock);
163EXPORT_SYMBOL_GPL(rtc_lock);
164
165static u64 tb_to_ns_scale __read_mostly;
166static unsigned tb_to_ns_shift __read_mostly;
167static unsigned long boot_tb __read_mostly;
168
169extern struct timezone sys_tz;
170static long timezone_offset;
171
172unsigned long ppc_proc_freq;
173EXPORT_SYMBOL(ppc_proc_freq);
174unsigned long ppc_tb_freq;
175
176static u64 tb_last_jiffy __cacheline_aligned_in_smp;
177static DEFINE_PER_CPU(u64, last_jiffy);
178
179#ifdef CONFIG_VIRT_CPU_ACCOUNTING
180
181
182
183
184
185u64 __cputime_jiffies_factor;
186EXPORT_SYMBOL(__cputime_jiffies_factor);
187u64 __cputime_msec_factor;
188EXPORT_SYMBOL(__cputime_msec_factor);
189u64 __cputime_sec_factor;
190EXPORT_SYMBOL(__cputime_sec_factor);
191u64 __cputime_clockt_factor;
192EXPORT_SYMBOL(__cputime_clockt_factor);
193DEFINE_PER_CPU(unsigned long, cputime_last_delta);
194DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
195
196cputime_t cputime_one_jiffy;
197
198static void calc_cputime_factors(void)
199{
200 struct div_result res;
201
202 div128_by_32(HZ, 0, tb_ticks_per_sec, &res);
203 __cputime_jiffies_factor = res.result_low;
204 div128_by_32(1000, 0, tb_ticks_per_sec, &res);
205 __cputime_msec_factor = res.result_low;
206 div128_by_32(1, 0, tb_ticks_per_sec, &res);
207 __cputime_sec_factor = res.result_low;
208 div128_by_32(USER_HZ, 0, tb_ticks_per_sec, &res);
209 __cputime_clockt_factor = res.result_low;
210}
211
212
213
214
215static u64 read_purr(void)
216{
217 if (cpu_has_feature(CPU_FTR_PURR))
218 return mfspr(SPRN_PURR);
219 return mftb();
220}
221
222
223
224
225static u64 read_spurr(u64 purr)
226{
227
228
229
230
231 if (cpu_has_feature(CPU_FTR_PURR) && cpu_has_feature(CPU_FTR_SPURR))
232 return mfspr(SPRN_SPURR);
233 return purr;
234}
235
236
237
238
239
240void account_system_vtime(struct task_struct *tsk)
241{
242 u64 now, nowscaled, delta, deltascaled, sys_time;
243 unsigned long flags;
244
245 local_irq_save(flags);
246 now = read_purr();
247 nowscaled = read_spurr(now);
248 delta = now - get_paca()->startpurr;
249 deltascaled = nowscaled - get_paca()->startspurr;
250 get_paca()->startpurr = now;
251 get_paca()->startspurr = nowscaled;
252 if (!in_interrupt()) {
253
254
255
256 sys_time = get_paca()->system_time;
257 if (get_paca()->user_time)
258 deltascaled = deltascaled * sys_time /
259 (sys_time + get_paca()->user_time);
260 delta += sys_time;
261 get_paca()->system_time = 0;
262 }
263 if (in_irq() || idle_task(smp_processor_id()) != tsk)
264 account_system_time(tsk, 0, delta, deltascaled);
265 else
266 account_idle_time(delta);
267 per_cpu(cputime_last_delta, smp_processor_id()) = delta;
268 per_cpu(cputime_scaled_last_delta, smp_processor_id()) = deltascaled;
269 local_irq_restore(flags);
270}
271
272
273
274
275
276
277
278void account_process_tick(struct task_struct *tsk, int user_tick)
279{
280 cputime_t utime, utimescaled;
281
282 utime = get_paca()->user_time;
283 get_paca()->user_time = 0;
284 utimescaled = cputime_to_scaled(utime);
285 account_user_time(tsk, utime, utimescaled);
286}
287
288
289
290
291struct cpu_purr_data {
292 int initialized;
293 u64 tb;
294 u64 purr;
295 u64 spurr;
296};
297
298
299
300
301
302
303
304
305static DEFINE_PER_CPU(struct cpu_purr_data, cpu_purr_data);
306
307static void snapshot_tb_and_purr(void *data)
308{
309 unsigned long flags;
310 struct cpu_purr_data *p = &__get_cpu_var(cpu_purr_data);
311
312 local_irq_save(flags);
313 p->tb = get_tb_or_rtc();
314 p->purr = mfspr(SPRN_PURR);
315 wmb();
316 p->initialized = 1;
317 local_irq_restore(flags);
318}
319
320
321
322
323void snapshot_timebases(void)
324{
325 if (!cpu_has_feature(CPU_FTR_PURR))
326 return;
327 on_each_cpu(snapshot_tb_and_purr, NULL, 1);
328}
329
330
331
332
333void calculate_steal_time(void)
334{
335 u64 tb, purr;
336 s64 stolen;
337 struct cpu_purr_data *pme;
338
339 pme = &__get_cpu_var(cpu_purr_data);
340 if (!pme->initialized)
341 return;
342 tb = mftb();
343 purr = mfspr(SPRN_PURR);
344 stolen = (tb - pme->tb) - (purr - pme->purr);
345 if (stolen > 0) {
346 if (idle_task(smp_processor_id()) != current)
347 account_steal_time(stolen);
348 else
349 account_idle_time(stolen);
350 }
351 pme->tb = tb;
352 pme->purr = purr;
353}
354
355#ifdef CONFIG_PPC_SPLPAR
356
357
358
359
360static void snapshot_purr(void)
361{
362 struct cpu_purr_data *pme;
363 unsigned long flags;
364
365 if (!cpu_has_feature(CPU_FTR_PURR))
366 return;
367 local_irq_save(flags);
368 pme = &__get_cpu_var(cpu_purr_data);
369 pme->tb = mftb();
370 pme->purr = mfspr(SPRN_PURR);
371 pme->initialized = 1;
372 local_irq_restore(flags);
373}
374
375#endif
376
377#else
378#define calc_cputime_factors()
379#define calculate_steal_time() do { } while (0)
380#endif
381
382#if !(defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR))
383#define snapshot_purr() do { } while (0)
384#endif
385
386
387
388
389
390void snapshot_timebase(void)
391{
392 __get_cpu_var(last_jiffy) = get_tb_or_rtc();
393 snapshot_purr();
394}
395
396void __delay(unsigned long loops)
397{
398 unsigned long start;
399 int diff;
400
401 if (__USE_RTC()) {
402 start = get_rtcl();
403 do {
404
405 diff = get_rtcl() - start;
406 if (diff < 0)
407 diff += 1000000000;
408 } while (diff < loops);
409 } else {
410 start = get_tbl();
411 while (get_tbl() - start < loops)
412 HMT_low();
413 HMT_medium();
414 }
415}
416EXPORT_SYMBOL(__delay);
417
418void udelay(unsigned long usecs)
419{
420 __delay(tb_ticks_per_usec * usecs);
421}
422EXPORT_SYMBOL(udelay);
423
424static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
425 u64 new_tb_to_xs)
426{
427
428
429
430
431
432
433
434
435
436
437
438 vdso_data->tb_orig_stamp = new_tb_stamp;
439 vdso_data->stamp_xsec = new_stamp_xsec;
440 vdso_data->tb_to_xs = new_tb_to_xs;
441 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
442 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
443 vdso_data->stamp_xtime = xtime;
444 smp_wmb();
445 ++(vdso_data->tb_update_count);
446}
447
448#ifdef CONFIG_SMP
449unsigned long profile_pc(struct pt_regs *regs)
450{
451 unsigned long pc = instruction_pointer(regs);
452
453 if (in_lock_functions(pc))
454 return regs->link;
455
456 return pc;
457}
458EXPORT_SYMBOL(profile_pc);
459#endif
460
461#ifdef CONFIG_PPC_ISERIES
462
463
464
465
466
467
468
469static int __init iSeries_tb_recal(void)
470{
471 struct div_result divres;
472 unsigned long titan, tb;
473
474
475 if (!firmware_has_feature(FW_FEATURE_ISERIES))
476 return -ENODEV;
477
478 tb = get_tb();
479 titan = HvCallXm_loadTod();
480 if ( iSeries_recal_titan ) {
481 unsigned long tb_ticks = tb - iSeries_recal_tb;
482 unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12;
483 unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec;
484 unsigned long new_tb_ticks_per_jiffy =
485 DIV_ROUND_CLOSEST(new_tb_ticks_per_sec, HZ);
486 long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy;
487 char sign = '+';
488
489 new_tb_ticks_per_sec = new_tb_ticks_per_jiffy * HZ;
490
491 if ( tick_diff < 0 ) {
492 tick_diff = -tick_diff;
493 sign = '-';
494 }
495 if ( tick_diff ) {
496 if ( tick_diff < tb_ticks_per_jiffy/25 ) {
497 printk( "Titan recalibrate: new tb_ticks_per_jiffy = %lu (%c%ld)\n",
498 new_tb_ticks_per_jiffy, sign, tick_diff );
499 tb_ticks_per_jiffy = new_tb_ticks_per_jiffy;
500 tb_ticks_per_sec = new_tb_ticks_per_sec;
501 calc_cputime_factors();
502 div128_by_32( XSEC_PER_SEC, 0, tb_ticks_per_sec, &divres );
503 tb_to_xs = divres.result_low;
504 vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
505 vdso_data->tb_to_xs = tb_to_xs;
506 setup_cputime_one_jiffy();
507 }
508 else {
509 printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
510 " new tb_ticks_per_jiffy = %lu\n"
511 " old tb_ticks_per_jiffy = %lu\n",
512 new_tb_ticks_per_jiffy, tb_ticks_per_jiffy );
513 }
514 }
515 }
516 iSeries_recal_titan = titan;
517 iSeries_recal_tb = tb;
518
519
520 clocksource_init();
521 return 0;
522}
523late_initcall(iSeries_tb_recal);
524
525
526void __init iSeries_time_init_early(void)
527{
528 iSeries_recal_tb = get_tb();
529 iSeries_recal_titan = HvCallXm_loadTod();
530}
531#endif
532
533#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_PPC32)
534DEFINE_PER_CPU(u8, perf_event_pending);
535
536void set_perf_event_pending(void)
537{
538 get_cpu_var(perf_event_pending) = 1;
539 set_dec(1);
540 put_cpu_var(perf_event_pending);
541}
542
543#define test_perf_event_pending() __get_cpu_var(perf_event_pending)
544#define clear_perf_event_pending() __get_cpu_var(perf_event_pending) = 0
545
546#else
547
548#define test_perf_event_pending() 0
549#define clear_perf_event_pending()
550
551#endif
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567void timer_interrupt(struct pt_regs * regs)
568{
569 struct pt_regs *old_regs;
570 struct decrementer_clock *decrementer = &__get_cpu_var(decrementers);
571 struct clock_event_device *evt = &decrementer->event;
572 u64 now;
573
574
575
576 set_dec(DECREMENTER_MAX);
577
578#ifdef CONFIG_PPC32
579 if (test_perf_event_pending()) {
580 clear_perf_event_pending();
581 perf_event_do_pending();
582 }
583 if (atomic_read(&ppc_n_lost_interrupts) != 0)
584 do_IRQ(regs);
585#endif
586
587 now = get_tb_or_rtc();
588 if (now < decrementer->next_tb) {
589
590 now = decrementer->next_tb - now;
591 if (now <= DECREMENTER_MAX)
592 set_dec((int)now);
593 return;
594 }
595 old_regs = set_irq_regs(regs);
596 irq_enter();
597
598 calculate_steal_time();
599
600#ifdef CONFIG_PPC_ISERIES
601 if (firmware_has_feature(FW_FEATURE_ISERIES))
602 get_lppaca()->int_dword.fields.decr_int = 0;
603#endif
604
605 if (evt->event_handler)
606 evt->event_handler(evt);
607
608#ifdef CONFIG_PPC_ISERIES
609 if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending())
610 process_hvlpevents();
611#endif
612
613#ifdef CONFIG_PPC64
614
615 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
616 struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);
617 cu->current_tb = mfspr(SPRN_PURR);
618 }
619#endif
620
621 irq_exit();
622 set_irq_regs(old_regs);
623}
624
625void wakeup_decrementer(void)
626{
627 unsigned long ticks;
628
629
630
631
632
633 ticks = tb_ticks_since(__get_cpu_var(last_jiffy));
634 if (ticks < tb_ticks_per_jiffy)
635 ticks = tb_ticks_per_jiffy - ticks;
636 else
637 ticks = 1;
638 set_dec(ticks);
639}
640
641#ifdef CONFIG_SUSPEND
642void generic_suspend_disable_irqs(void)
643{
644 preempt_disable();
645
646
647
648
649
650 set_dec(0x7fffffff);
651 local_irq_disable();
652 set_dec(0x7fffffff);
653}
654
655void generic_suspend_enable_irqs(void)
656{
657 wakeup_decrementer();
658
659 local_irq_enable();
660 preempt_enable();
661}
662
663
664void arch_suspend_disable_irqs(void)
665{
666 if (ppc_md.suspend_disable_irqs)
667 ppc_md.suspend_disable_irqs();
668 generic_suspend_disable_irqs();
669}
670
671
672void arch_suspend_enable_irqs(void)
673{
674 generic_suspend_enable_irqs();
675 if (ppc_md.suspend_enable_irqs)
676 ppc_md.suspend_enable_irqs();
677}
678#endif
679
680#ifdef CONFIG_SMP
681void __init smp_space_timers(unsigned int max_cpus)
682{
683 int i;
684 u64 previous_tb = per_cpu(last_jiffy, boot_cpuid);
685
686
687 previous_tb -= tb_ticks_per_jiffy;
688
689 for_each_possible_cpu(i) {
690 if (i == boot_cpuid)
691 continue;
692 per_cpu(last_jiffy, i) = previous_tb;
693 }
694}
695#endif
696
697
698
699
700
701
702
703
704unsigned long long sched_clock(void)
705{
706 if (__USE_RTC())
707 return get_rtc();
708 return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
709}
710
711static int __init get_freq(char *name, int cells, unsigned long *val)
712{
713 struct device_node *cpu;
714 const unsigned int *fp;
715 int found = 0;
716
717
718 cpu = of_find_node_by_type(NULL, "cpu");
719
720 if (cpu) {
721 fp = of_get_property(cpu, name, NULL);
722 if (fp) {
723 found = 1;
724 *val = of_read_ulong(fp, cells);
725 }
726
727 of_node_put(cpu);
728 }
729
730 return found;
731}
732
733
734void start_cpu_decrementer(void)
735{
736#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
737
738 mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
739
740
741 mtspr(SPRN_TCR, TCR_DIE);
742#endif
743}
744
745void __init generic_calibrate_decr(void)
746{
747 ppc_tb_freq = DEFAULT_TB_FREQ;
748
749 if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) &&
750 !get_freq("timebase-frequency", 1, &ppc_tb_freq)) {
751
752 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
753 "(not found)\n");
754 }
755
756 ppc_proc_freq = DEFAULT_PROC_FREQ;
757
758 if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) &&
759 !get_freq("clock-frequency", 1, &ppc_proc_freq)) {
760
761 printk(KERN_ERR "WARNING: Estimating processor frequency "
762 "(not found)\n");
763 }
764}
765
766int update_persistent_clock(struct timespec now)
767{
768 struct rtc_time tm;
769
770 if (!ppc_md.set_rtc_time)
771 return 0;
772
773 to_tm(now.tv_sec + 1 + timezone_offset, &tm);
774 tm.tm_year -= 1900;
775 tm.tm_mon -= 1;
776
777 return ppc_md.set_rtc_time(&tm);
778}
779
780static void __read_persistent_clock(struct timespec *ts)
781{
782 struct rtc_time tm;
783 static int first = 1;
784
785 ts->tv_nsec = 0;
786
787 if (first) {
788 first = 0;
789 if (ppc_md.time_init)
790 timezone_offset = ppc_md.time_init();
791
792
793 if (ppc_md.get_boot_time) {
794 ts->tv_sec = ppc_md.get_boot_time() - timezone_offset;
795 return;
796 }
797 }
798 if (!ppc_md.get_rtc_time) {
799 ts->tv_sec = 0;
800 return;
801 }
802 ppc_md.get_rtc_time(&tm);
803
804 ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
805 tm.tm_hour, tm.tm_min, tm.tm_sec);
806}
807
808void read_persistent_clock(struct timespec *ts)
809{
810 __read_persistent_clock(ts);
811
812
813 if (ts->tv_sec < 0) {
814 ts->tv_sec = 0;
815 ts->tv_nsec = 0;
816 }
817
818}
819
820
821static cycle_t rtc_read(struct clocksource *cs)
822{
823 return (cycle_t)get_rtc();
824}
825
826static cycle_t timebase_read(struct clocksource *cs)
827{
828 return (cycle_t)get_tb();
829}
830
831void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
832{
833 u64 t2x, stamp_xsec;
834
835 if (clock != &clocksource_timebase)
836 return;
837
838
839 ++vdso_data->tb_update_count;
840 smp_mb();
841
842
843
844 t2x = (u64) clock->mult * 4611686018ULL;
845 stamp_xsec = (u64) xtime.tv_nsec * XSEC_PER_SEC;
846 do_div(stamp_xsec, 1000000000);
847 stamp_xsec += (u64) xtime.tv_sec * XSEC_PER_SEC;
848 update_gtod(clock->cycle_last, stamp_xsec, t2x);
849}
850
851void update_vsyscall_tz(void)
852{
853
854 ++vdso_data->tb_update_count;
855 smp_mb();
856 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
857 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
858 smp_mb();
859 ++vdso_data->tb_update_count;
860}
861
862static void __init clocksource_init(void)
863{
864 struct clocksource *clock;
865
866 if (__USE_RTC())
867 clock = &clocksource_rtc;
868 else
869 clock = &clocksource_timebase;
870
871 clock->mult = clocksource_hz2mult(tb_ticks_per_sec, clock->shift);
872
873 if (clocksource_register(clock)) {
874 printk(KERN_ERR "clocksource: %s is already registered\n",
875 clock->name);
876 return;
877 }
878
879 printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n",
880 clock->name, clock->mult, clock->shift);
881}
882
883static int decrementer_set_next_event(unsigned long evt,
884 struct clock_event_device *dev)
885{
886 __get_cpu_var(decrementers).next_tb = get_tb_or_rtc() + evt;
887 set_dec(evt);
888 return 0;
889}
890
891static void decrementer_set_mode(enum clock_event_mode mode,
892 struct clock_event_device *dev)
893{
894 if (mode != CLOCK_EVT_MODE_ONESHOT)
895 decrementer_set_next_event(DECREMENTER_MAX, dev);
896}
897
898static void __init setup_clockevent_multiplier(unsigned long hz)
899{
900 u64 mult, shift = 32;
901
902 while (1) {
903 mult = div_sc(hz, NSEC_PER_SEC, shift);
904 if (mult && (mult >> 32UL) == 0UL)
905 break;
906
907 shift--;
908 }
909
910 decrementer_clockevent.shift = shift;
911 decrementer_clockevent.mult = mult;
912}
913
914static void register_decrementer_clockevent(int cpu)
915{
916 struct clock_event_device *dec = &per_cpu(decrementers, cpu).event;
917
918 *dec = decrementer_clockevent;
919 dec->cpumask = cpumask_of(cpu);
920
921 printk(KERN_DEBUG "clockevent: %s mult[%lx] shift[%d] cpu[%d]\n",
922 dec->name, dec->mult, dec->shift, cpu);
923
924 clockevents_register_device(dec);
925}
926
927static void __init init_decrementer_clockevent(void)
928{
929 int cpu = smp_processor_id();
930
931 setup_clockevent_multiplier(ppc_tb_freq);
932 decrementer_clockevent.max_delta_ns =
933 clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent);
934 decrementer_clockevent.min_delta_ns =
935 clockevent_delta2ns(2, &decrementer_clockevent);
936
937 register_decrementer_clockevent(cpu);
938}
939
940void secondary_cpu_time_init(void)
941{
942
943
944
945 start_cpu_decrementer();
946
947
948
949 register_decrementer_clockevent(smp_processor_id());
950}
951
952
953void __init time_init(void)
954{
955 unsigned long flags;
956 struct div_result res;
957 u64 scale, x;
958 unsigned shift;
959
960 if (__USE_RTC()) {
961
962 ppc_tb_freq = 1000000000;
963 tb_last_jiffy = get_rtcl();
964 } else {
965
966 ppc_md.calibrate_decr();
967 printk(KERN_DEBUG "time_init: decrementer frequency = %lu.%.6lu MHz\n",
968 ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
969 printk(KERN_DEBUG "time_init: processor frequency = %lu.%.6lu MHz\n",
970 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
971 tb_last_jiffy = get_tb();
972 }
973
974 tb_ticks_per_jiffy = ppc_tb_freq / HZ;
975 tb_ticks_per_sec = ppc_tb_freq;
976 tb_ticks_per_usec = ppc_tb_freq / 1000000;
977 tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
978 calc_cputime_factors();
979 setup_cputime_one_jiffy();
980
981
982
983
984
985
986
987 x = (u64) NSEC_PER_SEC * tb_ticks_per_jiffy + ppc_tb_freq - 1;
988 do_div(x, ppc_tb_freq);
989 tick_nsec = x;
990 last_tick_len = x << TICKLEN_SCALE;
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006 div128_by_32((1ULL << 51) - ppc_tb_freq, 0,
1007 tb_ticks_per_jiffy << SHIFT_HZ, &res);
1008 div128_by_32(res.result_high, res.result_low, NSEC_PER_SEC, &res);
1009 ticklen_to_xs = res.result_low;
1010
1011
1012 tb_to_xs = mulhdu(last_tick_len << TICKLEN_SHIFT, ticklen_to_xs);
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024 div128_by_32(1000000000, 0, tb_ticks_per_sec, &res);
1025 scale = res.result_low;
1026 for (shift = 0; res.result_high != 0; ++shift) {
1027 scale = (scale >> 1) | (res.result_high << 63);
1028 res.result_high >>= 1;
1029 }
1030 tb_to_ns_scale = scale;
1031 tb_to_ns_shift = shift;
1032
1033 boot_tb = get_tb_or_rtc();
1034
1035 write_seqlock_irqsave(&xtime_lock, flags);
1036
1037
1038 if (timezone_offset) {
1039 sys_tz.tz_minuteswest = -timezone_offset / 60;
1040 sys_tz.tz_dsttime = 0;
1041 }
1042
1043 vdso_data->tb_orig_stamp = tb_last_jiffy;
1044 vdso_data->tb_update_count = 0;
1045 vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
1046 vdso_data->stamp_xsec = (u64) xtime.tv_sec * XSEC_PER_SEC;
1047 vdso_data->tb_to_xs = tb_to_xs;
1048
1049 write_sequnlock_irqrestore(&xtime_lock, flags);
1050
1051
1052
1053
1054 start_cpu_decrementer();
1055
1056
1057 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1058 clocksource_init();
1059
1060 init_decrementer_clockevent();
1061}
1062
1063
1064#define FEBRUARY 2
1065#define STARTOFTIME 1970
1066#define SECDAY 86400L
1067#define SECYR (SECDAY * 365)
1068#define leapyear(year) ((year) % 4 == 0 && \
1069 ((year) % 100 != 0 || (year) % 400 == 0))
1070#define days_in_year(a) (leapyear(a) ? 366 : 365)
1071#define days_in_month(a) (month_days[(a) - 1])
1072
1073static int month_days[12] = {
1074 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1075};
1076
1077
1078
1079
1080void GregorianDay(struct rtc_time * tm)
1081{
1082 int leapsToDate;
1083 int lastYear;
1084 int day;
1085 int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1086
1087 lastYear = tm->tm_year - 1;
1088
1089
1090
1091
1092 leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1093
1094
1095
1096
1097
1098
1099
1100 day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1101
1102 day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1103 tm->tm_mday;
1104
1105 tm->tm_wday = day % 7;
1106}
1107
1108void to_tm(int tim, struct rtc_time * tm)
1109{
1110 register int i;
1111 register long hms, day;
1112
1113 day = tim / SECDAY;
1114 hms = tim % SECDAY;
1115
1116
1117 tm->tm_hour = hms / 3600;
1118 tm->tm_min = (hms % 3600) / 60;
1119 tm->tm_sec = (hms % 3600) % 60;
1120
1121
1122 for (i = STARTOFTIME; day >= days_in_year(i); i++)
1123 day -= days_in_year(i);
1124 tm->tm_year = i;
1125
1126
1127 if (leapyear(tm->tm_year))
1128 days_in_month(FEBRUARY) = 29;
1129 for (i = 1; day >= days_in_month(i); i++)
1130 day -= days_in_month(i);
1131 days_in_month(FEBRUARY) = 28;
1132 tm->tm_mon = i;
1133
1134
1135 tm->tm_mday = day + 1;
1136
1137
1138
1139
1140 GregorianDay(tm);
1141}
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151unsigned mulhwu_scale_factor(unsigned inscale, unsigned outscale)
1152{
1153 unsigned mlt=0, tmp, err;
1154
1155
1156
1157
1158 for (tmp = 1U<<31; tmp != 0; tmp >>= 1) {
1159 if (mulhwu(inscale, mlt|tmp) < outscale)
1160 mlt |= tmp;
1161 }
1162
1163
1164
1165
1166
1167
1168
1169
1170 err = inscale * (mlt+1);
1171 if (err <= inscale/2)
1172 mlt++;
1173 return mlt;
1174}
1175
1176
1177
1178
1179
1180void div128_by_32(u64 dividend_high, u64 dividend_low,
1181 unsigned divisor, struct div_result *dr)
1182{
1183 unsigned long a, b, c, d;
1184 unsigned long w, x, y, z;
1185 u64 ra, rb, rc;
1186
1187 a = dividend_high >> 32;
1188 b = dividend_high & 0xffffffff;
1189 c = dividend_low >> 32;
1190 d = dividend_low & 0xffffffff;
1191
1192 w = a / divisor;
1193 ra = ((u64)(a - (w * divisor)) << 32) + b;
1194
1195 rb = ((u64) do_div(ra, divisor) << 32) + c;
1196 x = ra;
1197
1198 rc = ((u64) do_div(rb, divisor) << 32) + d;
1199 y = rb;
1200
1201 do_div(rc, divisor);
1202 z = rc;
1203
1204 dr->result_high = ((u64)w << 32) + x;
1205 dr->result_low = ((u64)y << 32) + z;
1206
1207}
1208
1209
1210void calibrate_delay(void)
1211{
1212
1213
1214
1215 loops_per_jiffy = tb_ticks_per_jiffy;
1216}
1217
1218static int __init rtc_init(void)
1219{
1220 struct platform_device *pdev;
1221
1222 if (!ppc_md.get_rtc_time)
1223 return -ENODEV;
1224
1225 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
1226 if (IS_ERR(pdev))
1227 return PTR_ERR(pdev);
1228
1229 return 0;
1230}
1231
1232module_init(rtc_init);
1233