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34#include <linux/errno.h>
35#include <linux/export.h>
36#include <linux/sched.h>
37#include <linux/kernel.h>
38#include <linux/param.h>
39#include <linux/string.h>
40#include <linux/mm.h>
41#include <linux/interrupt.h>
42#include <linux/timex.h>
43#include <linux/kernel_stat.h>
44#include <linux/time.h>
45#include <linux/clockchips.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/irq_work.h>
57#include <linux/clk-provider.h>
58#include <asm/trace.h>
59
60#include <asm/io.h>
61#include <asm/processor.h>
62#include <asm/nvram.h>
63#include <asm/cache.h>
64#include <asm/machdep.h>
65#include <asm/uaccess.h>
66#include <asm/time.h>
67#include <asm/prom.h>
68#include <asm/irq.h>
69#include <asm/div64.h>
70#include <asm/smp.h>
71#include <asm/vdso_datapage.h>
72#include <asm/firmware.h>
73#include <asm/cputime.h>
74
75
76
77#include <linux/clockchips.h>
78#include <linux/timekeeper_internal.h>
79
80static cycle_t rtc_read(struct clocksource *);
81static struct clocksource clocksource_rtc = {
82 .name = "rtc",
83 .rating = 400,
84 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
85 .mask = CLOCKSOURCE_MASK(64),
86 .read = rtc_read,
87};
88
89static cycle_t timebase_read(struct clocksource *);
90static struct clocksource clocksource_timebase = {
91 .name = "timebase",
92 .rating = 400,
93 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
94 .mask = CLOCKSOURCE_MASK(64),
95 .read = timebase_read,
96};
97
98#define DECREMENTER_MAX 0x7fffffff
99
100static int decrementer_set_next_event(unsigned long evt,
101 struct clock_event_device *dev);
102static int decrementer_shutdown(struct clock_event_device *evt);
103
104struct clock_event_device decrementer_clockevent = {
105 .name = "decrementer",
106 .rating = 200,
107 .irq = 0,
108 .set_next_event = decrementer_set_next_event,
109 .set_state_shutdown = decrementer_shutdown,
110 .tick_resume = decrementer_shutdown,
111 .features = CLOCK_EVT_FEAT_ONESHOT |
112 CLOCK_EVT_FEAT_C3STOP,
113};
114EXPORT_SYMBOL(decrementer_clockevent);
115
116DEFINE_PER_CPU(u64, decrementers_next_tb);
117static DEFINE_PER_CPU(struct clock_event_device, decrementers);
118
119#define XSEC_PER_SEC (1024*1024)
120
121#ifdef CONFIG_PPC64
122#define SCALE_XSEC(xsec, max) (((xsec) * max) / XSEC_PER_SEC)
123#else
124
125#define SCALE_XSEC(xsec, max) mulhwu((xsec) << 12, max)
126#endif
127
128unsigned long tb_ticks_per_jiffy;
129unsigned long tb_ticks_per_usec = 100;
130EXPORT_SYMBOL(tb_ticks_per_usec);
131unsigned long tb_ticks_per_sec;
132EXPORT_SYMBOL(tb_ticks_per_sec);
133
134DEFINE_SPINLOCK(rtc_lock);
135EXPORT_SYMBOL_GPL(rtc_lock);
136
137static u64 tb_to_ns_scale __read_mostly;
138static unsigned tb_to_ns_shift __read_mostly;
139static u64 boot_tb __read_mostly;
140
141extern struct timezone sys_tz;
142static long timezone_offset;
143
144unsigned long ppc_proc_freq;
145EXPORT_SYMBOL_GPL(ppc_proc_freq);
146unsigned long ppc_tb_freq;
147EXPORT_SYMBOL_GPL(ppc_tb_freq);
148
149#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
150
151
152
153
154
155u64 __cputime_jiffies_factor;
156EXPORT_SYMBOL(__cputime_jiffies_factor);
157u64 __cputime_usec_factor;
158EXPORT_SYMBOL(__cputime_usec_factor);
159u64 __cputime_sec_factor;
160EXPORT_SYMBOL(__cputime_sec_factor);
161u64 __cputime_clockt_factor;
162EXPORT_SYMBOL(__cputime_clockt_factor);
163DEFINE_PER_CPU(unsigned long, cputime_last_delta);
164DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
165
166cputime_t cputime_one_jiffy;
167
168void (*dtl_consumer)(struct dtl_entry *, u64);
169
170static void calc_cputime_factors(void)
171{
172 struct div_result res;
173
174 div128_by_32(HZ, 0, tb_ticks_per_sec, &res);
175 __cputime_jiffies_factor = res.result_low;
176 div128_by_32(1000000, 0, tb_ticks_per_sec, &res);
177 __cputime_usec_factor = res.result_low;
178 div128_by_32(1, 0, tb_ticks_per_sec, &res);
179 __cputime_sec_factor = res.result_low;
180 div128_by_32(USER_HZ, 0, tb_ticks_per_sec, &res);
181 __cputime_clockt_factor = res.result_low;
182}
183
184
185
186
187
188static u64 read_spurr(u64 tb)
189{
190 if (cpu_has_feature(CPU_FTR_SPURR))
191 return mfspr(SPRN_SPURR);
192 if (cpu_has_feature(CPU_FTR_PURR))
193 return mfspr(SPRN_PURR);
194 return tb;
195}
196
197#ifdef CONFIG_PPC_SPLPAR
198
199
200
201
202
203static u64 scan_dispatch_log(u64 stop_tb)
204{
205 u64 i = local_paca->dtl_ridx;
206 struct dtl_entry *dtl = local_paca->dtl_curr;
207 struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
208 struct lppaca *vpa = local_paca->lppaca_ptr;
209 u64 tb_delta;
210 u64 stolen = 0;
211 u64 dtb;
212
213 if (!dtl)
214 return 0;
215
216 if (i == be64_to_cpu(vpa->dtl_idx))
217 return 0;
218 while (i < be64_to_cpu(vpa->dtl_idx)) {
219 dtb = be64_to_cpu(dtl->timebase);
220 tb_delta = be32_to_cpu(dtl->enqueue_to_dispatch_time) +
221 be32_to_cpu(dtl->ready_to_enqueue_time);
222 barrier();
223 if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
224
225 i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
226 dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
227 continue;
228 }
229 if (dtb > stop_tb)
230 break;
231 if (dtl_consumer)
232 dtl_consumer(dtl, i);
233 stolen += tb_delta;
234 ++i;
235 ++dtl;
236 if (dtl == dtl_end)
237 dtl = local_paca->dispatch_log;
238 }
239 local_paca->dtl_ridx = i;
240 local_paca->dtl_curr = dtl;
241 return stolen;
242}
243
244
245
246
247
248void accumulate_stolen_time(void)
249{
250 u64 sst, ust;
251
252 u8 save_soft_enabled = local_paca->soft_enabled;
253
254
255
256
257
258
259
260 local_paca->soft_enabled = 0;
261
262 sst = scan_dispatch_log(local_paca->starttime_user);
263 ust = scan_dispatch_log(local_paca->starttime);
264 local_paca->system_time -= sst;
265 local_paca->user_time -= ust;
266 local_paca->stolen_time += ust + sst;
267
268 local_paca->soft_enabled = save_soft_enabled;
269}
270
271static inline u64 calculate_stolen_time(u64 stop_tb)
272{
273 u64 stolen = 0;
274
275 if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) {
276 stolen = scan_dispatch_log(stop_tb);
277 get_paca()->system_time -= stolen;
278 }
279
280 stolen += get_paca()->stolen_time;
281 get_paca()->stolen_time = 0;
282 return stolen;
283}
284
285#else
286static inline u64 calculate_stolen_time(u64 stop_tb)
287{
288 return 0;
289}
290
291#endif
292
293
294
295
296
297static u64 vtime_delta(struct task_struct *tsk,
298 u64 *sys_scaled, u64 *stolen)
299{
300 u64 now, nowscaled, deltascaled;
301 u64 udelta, delta, user_scaled;
302
303 WARN_ON_ONCE(!irqs_disabled());
304
305 now = mftb();
306 nowscaled = read_spurr(now);
307 get_paca()->system_time += now - get_paca()->starttime;
308 get_paca()->starttime = now;
309 deltascaled = nowscaled - get_paca()->startspurr;
310 get_paca()->startspurr = nowscaled;
311
312 *stolen = calculate_stolen_time(now);
313
314 delta = get_paca()->system_time;
315 get_paca()->system_time = 0;
316 udelta = get_paca()->user_time - get_paca()->utime_sspurr;
317 get_paca()->utime_sspurr = get_paca()->user_time;
318
319
320
321
322
323
324
325
326
327
328
329 *sys_scaled = delta;
330 user_scaled = udelta;
331 if (deltascaled != delta + udelta) {
332 if (udelta) {
333 *sys_scaled = deltascaled * delta / (delta + udelta);
334 user_scaled = deltascaled - *sys_scaled;
335 } else {
336 *sys_scaled = deltascaled;
337 }
338 }
339 get_paca()->user_time_scaled += user_scaled;
340
341 return delta;
342}
343
344void vtime_account_system(struct task_struct *tsk)
345{
346 u64 delta, sys_scaled, stolen;
347
348 delta = vtime_delta(tsk, &sys_scaled, &stolen);
349 account_system_time(tsk, 0, delta, sys_scaled);
350 if (stolen)
351 account_steal_time(stolen);
352}
353EXPORT_SYMBOL_GPL(vtime_account_system);
354
355void vtime_account_idle(struct task_struct *tsk)
356{
357 u64 delta, sys_scaled, stolen;
358
359 delta = vtime_delta(tsk, &sys_scaled, &stolen);
360 account_idle_time(delta + stolen);
361}
362
363
364
365
366
367
368
369
370
371
372void vtime_account_user(struct task_struct *tsk)
373{
374 cputime_t utime, utimescaled;
375
376 utime = get_paca()->user_time;
377 utimescaled = get_paca()->user_time_scaled;
378 get_paca()->user_time = 0;
379 get_paca()->user_time_scaled = 0;
380 get_paca()->utime_sspurr = 0;
381 account_user_time(tsk, utime, utimescaled);
382}
383
384#else
385#define calc_cputime_factors()
386#endif
387
388void __delay(unsigned long loops)
389{
390 unsigned long start;
391 int diff;
392
393 if (__USE_RTC()) {
394 start = get_rtcl();
395 do {
396
397 diff = get_rtcl() - start;
398 if (diff < 0)
399 diff += 1000000000;
400 } while (diff < loops);
401 } else {
402 start = get_tbl();
403 while (get_tbl() - start < loops)
404 HMT_low();
405 HMT_medium();
406 }
407}
408EXPORT_SYMBOL(__delay);
409
410void udelay(unsigned long usecs)
411{
412 __delay(tb_ticks_per_usec * usecs);
413}
414EXPORT_SYMBOL(udelay);
415
416#ifdef CONFIG_SMP
417unsigned long profile_pc(struct pt_regs *regs)
418{
419 unsigned long pc = instruction_pointer(regs);
420
421 if (in_lock_functions(pc))
422 return regs->link;
423
424 return pc;
425}
426EXPORT_SYMBOL(profile_pc);
427#endif
428
429#ifdef CONFIG_IRQ_WORK
430
431
432
433
434#ifdef CONFIG_PPC64
435static inline unsigned long test_irq_work_pending(void)
436{
437 unsigned long x;
438
439 asm volatile("lbz %0,%1(13)"
440 : "=r" (x)
441 : "i" (offsetof(struct paca_struct, irq_work_pending)));
442 return x;
443}
444
445static inline void set_irq_work_pending_flag(void)
446{
447 asm volatile("stb %0,%1(13)" : :
448 "r" (1),
449 "i" (offsetof(struct paca_struct, irq_work_pending)));
450}
451
452static inline void clear_irq_work_pending(void)
453{
454 asm volatile("stb %0,%1(13)" : :
455 "r" (0),
456 "i" (offsetof(struct paca_struct, irq_work_pending)));
457}
458
459#else
460
461DEFINE_PER_CPU(u8, irq_work_pending);
462
463#define set_irq_work_pending_flag() __this_cpu_write(irq_work_pending, 1)
464#define test_irq_work_pending() __this_cpu_read(irq_work_pending)
465#define clear_irq_work_pending() __this_cpu_write(irq_work_pending, 0)
466
467#endif
468
469void arch_irq_work_raise(void)
470{
471 preempt_disable();
472 set_irq_work_pending_flag();
473 set_dec(1);
474 preempt_enable();
475}
476
477#else
478
479#define test_irq_work_pending() 0
480#define clear_irq_work_pending()
481
482#endif
483
484static void __timer_interrupt(void)
485{
486 struct pt_regs *regs = get_irq_regs();
487 u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);
488 struct clock_event_device *evt = this_cpu_ptr(&decrementers);
489 u64 now;
490
491 trace_timer_interrupt_entry(regs);
492
493 if (test_irq_work_pending()) {
494 clear_irq_work_pending();
495 irq_work_run();
496 }
497
498 now = get_tb_or_rtc();
499 if (now >= *next_tb) {
500 *next_tb = ~(u64)0;
501 if (evt->event_handler)
502 evt->event_handler(evt);
503 __this_cpu_inc(irq_stat.timer_irqs_event);
504 } else {
505 now = *next_tb - now;
506 if (now <= DECREMENTER_MAX)
507 set_dec((int)now);
508
509 if (test_irq_work_pending())
510 set_dec(1);
511 __this_cpu_inc(irq_stat.timer_irqs_others);
512 }
513
514#ifdef CONFIG_PPC64
515
516 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
517 struct cpu_usage *cu = this_cpu_ptr(&cpu_usage_array);
518 cu->current_tb = mfspr(SPRN_PURR);
519 }
520#endif
521
522 trace_timer_interrupt_exit(regs);
523}
524
525
526
527
528
529void timer_interrupt(struct pt_regs * regs)
530{
531 struct pt_regs *old_regs;
532 u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);
533
534
535
536
537 set_dec(DECREMENTER_MAX);
538
539
540
541
542
543
544
545 if (!cpu_online(smp_processor_id())) {
546 *next_tb = ~(u64)0;
547 return;
548 }
549
550
551
552
553 may_hard_irq_enable();
554
555
556#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC)
557 if (atomic_read(&ppc_n_lost_interrupts) != 0)
558 do_IRQ(regs);
559#endif
560
561 old_regs = set_irq_regs(regs);
562 irq_enter();
563
564 __timer_interrupt();
565 irq_exit();
566 set_irq_regs(old_regs);
567}
568
569
570
571
572
573
574void hdec_interrupt(struct pt_regs *regs)
575{
576}
577
578#ifdef CONFIG_SUSPEND
579static void generic_suspend_disable_irqs(void)
580{
581
582
583
584
585 set_dec(DECREMENTER_MAX);
586 local_irq_disable();
587 set_dec(DECREMENTER_MAX);
588}
589
590static void generic_suspend_enable_irqs(void)
591{
592 local_irq_enable();
593}
594
595
596void arch_suspend_disable_irqs(void)
597{
598 if (ppc_md.suspend_disable_irqs)
599 ppc_md.suspend_disable_irqs();
600 generic_suspend_disable_irqs();
601}
602
603
604void arch_suspend_enable_irqs(void)
605{
606 generic_suspend_enable_irqs();
607 if (ppc_md.suspend_enable_irqs)
608 ppc_md.suspend_enable_irqs();
609}
610#endif
611
612unsigned long long tb_to_ns(unsigned long long ticks)
613{
614 return mulhdu(ticks, tb_to_ns_scale) << tb_to_ns_shift;
615}
616EXPORT_SYMBOL_GPL(tb_to_ns);
617
618
619
620
621
622
623
624
625unsigned long long sched_clock(void)
626{
627 if (__USE_RTC())
628 return get_rtc();
629 return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
630}
631
632
633#ifdef CONFIG_PPC_PSERIES
634
635
636
637
638
639
640unsigned long long running_clock(void)
641{
642
643
644
645
646
647
648
649
650 if (firmware_has_feature(FW_FEATURE_LPAR) &&
651 cpu_has_feature(CPU_FTR_ARCH_207S))
652 return mulhdu(get_vtb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
653
654
655
656
657
658
659
660 return local_clock() - cputime_to_nsecs(kcpustat_this_cpu->cpustat[CPUTIME_STEAL]);
661}
662#endif
663
664static int __init get_freq(char *name, int cells, unsigned long *val)
665{
666 struct device_node *cpu;
667 const __be32 *fp;
668 int found = 0;
669
670
671 cpu = of_find_node_by_type(NULL, "cpu");
672
673 if (cpu) {
674 fp = of_get_property(cpu, name, NULL);
675 if (fp) {
676 found = 1;
677 *val = of_read_ulong(fp, cells);
678 }
679
680 of_node_put(cpu);
681 }
682
683 return found;
684}
685
686static void start_cpu_decrementer(void)
687{
688#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
689
690 mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
691
692
693 mtspr(SPRN_TCR, TCR_DIE);
694#endif
695}
696
697void __init generic_calibrate_decr(void)
698{
699 ppc_tb_freq = DEFAULT_TB_FREQ;
700
701 if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) &&
702 !get_freq("timebase-frequency", 1, &ppc_tb_freq)) {
703
704 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
705 "(not found)\n");
706 }
707
708 ppc_proc_freq = DEFAULT_PROC_FREQ;
709
710 if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) &&
711 !get_freq("clock-frequency", 1, &ppc_proc_freq)) {
712
713 printk(KERN_ERR "WARNING: Estimating processor frequency "
714 "(not found)\n");
715 }
716}
717
718int update_persistent_clock(struct timespec now)
719{
720 struct rtc_time tm;
721
722 if (!ppc_md.set_rtc_time)
723 return -ENODEV;
724
725 to_tm(now.tv_sec + 1 + timezone_offset, &tm);
726 tm.tm_year -= 1900;
727 tm.tm_mon -= 1;
728
729 return ppc_md.set_rtc_time(&tm);
730}
731
732static void __read_persistent_clock(struct timespec *ts)
733{
734 struct rtc_time tm;
735 static int first = 1;
736
737 ts->tv_nsec = 0;
738
739 if (first) {
740 first = 0;
741 if (ppc_md.time_init)
742 timezone_offset = ppc_md.time_init();
743
744
745 if (ppc_md.get_boot_time) {
746 ts->tv_sec = ppc_md.get_boot_time() - timezone_offset;
747 return;
748 }
749 }
750 if (!ppc_md.get_rtc_time) {
751 ts->tv_sec = 0;
752 return;
753 }
754 ppc_md.get_rtc_time(&tm);
755
756 ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
757 tm.tm_hour, tm.tm_min, tm.tm_sec);
758}
759
760void read_persistent_clock(struct timespec *ts)
761{
762 __read_persistent_clock(ts);
763
764
765 if (ts->tv_sec < 0) {
766 ts->tv_sec = 0;
767 ts->tv_nsec = 0;
768 }
769
770}
771
772
773static cycle_t rtc_read(struct clocksource *cs)
774{
775 return (cycle_t)get_rtc();
776}
777
778static cycle_t timebase_read(struct clocksource *cs)
779{
780 return (cycle_t)get_tb();
781}
782
783void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
784 struct clocksource *clock, u32 mult, cycle_t cycle_last)
785{
786 u64 new_tb_to_xs, new_stamp_xsec;
787 u32 frac_sec;
788
789 if (clock != &clocksource_timebase)
790 return;
791
792
793 ++vdso_data->tb_update_count;
794 smp_mb();
795
796
797 new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift);
798 new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
799 do_div(new_stamp_xsec, 1000000000);
800 new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
801
802 BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC);
803
804 frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32;
805
806
807
808
809
810
811
812
813
814
815
816
817 vdso_data->tb_orig_stamp = cycle_last;
818 vdso_data->stamp_xsec = new_stamp_xsec;
819 vdso_data->tb_to_xs = new_tb_to_xs;
820 vdso_data->wtom_clock_sec = wtm->tv_sec;
821 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
822 vdso_data->stamp_xtime = *wall_time;
823 vdso_data->stamp_sec_fraction = frac_sec;
824 smp_wmb();
825 ++(vdso_data->tb_update_count);
826}
827
828void update_vsyscall_tz(void)
829{
830 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
831 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
832}
833
834static void __init clocksource_init(void)
835{
836 struct clocksource *clock;
837
838 if (__USE_RTC())
839 clock = &clocksource_rtc;
840 else
841 clock = &clocksource_timebase;
842
843 if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
844 printk(KERN_ERR "clocksource: %s is already registered\n",
845 clock->name);
846 return;
847 }
848
849 printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n",
850 clock->name, clock->mult, clock->shift);
851}
852
853static int decrementer_set_next_event(unsigned long evt,
854 struct clock_event_device *dev)
855{
856 __this_cpu_write(decrementers_next_tb, get_tb_or_rtc() + evt);
857 set_dec(evt);
858
859
860 if (test_irq_work_pending())
861 set_dec(1);
862
863 return 0;
864}
865
866static int decrementer_shutdown(struct clock_event_device *dev)
867{
868 decrementer_set_next_event(DECREMENTER_MAX, dev);
869 return 0;
870}
871
872
873void tick_broadcast_ipi_handler(void)
874{
875 u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);
876
877 *next_tb = get_tb_or_rtc();
878 __timer_interrupt();
879}
880
881static void register_decrementer_clockevent(int cpu)
882{
883 struct clock_event_device *dec = &per_cpu(decrementers, cpu);
884
885 *dec = decrementer_clockevent;
886 dec->cpumask = cpumask_of(cpu);
887
888 printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n",
889 dec->name, dec->mult, dec->shift, cpu);
890
891 clockevents_register_device(dec);
892}
893
894static void __init init_decrementer_clockevent(void)
895{
896 int cpu = smp_processor_id();
897
898 clockevents_calc_mult_shift(&decrementer_clockevent, ppc_tb_freq, 4);
899
900 decrementer_clockevent.max_delta_ns =
901 clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent);
902 decrementer_clockevent.min_delta_ns =
903 clockevent_delta2ns(2, &decrementer_clockevent);
904
905 register_decrementer_clockevent(cpu);
906}
907
908void secondary_cpu_time_init(void)
909{
910
911
912
913 start_cpu_decrementer();
914
915
916
917 register_decrementer_clockevent(smp_processor_id());
918}
919
920
921void __init time_init(void)
922{
923 struct div_result res;
924 u64 scale;
925 unsigned shift;
926
927 if (__USE_RTC()) {
928
929 ppc_tb_freq = 1000000000;
930 } else {
931
932 ppc_md.calibrate_decr();
933 printk(KERN_DEBUG "time_init: decrementer frequency = %lu.%.6lu MHz\n",
934 ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
935 printk(KERN_DEBUG "time_init: processor frequency = %lu.%.6lu MHz\n",
936 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
937 }
938
939 tb_ticks_per_jiffy = ppc_tb_freq / HZ;
940 tb_ticks_per_sec = ppc_tb_freq;
941 tb_ticks_per_usec = ppc_tb_freq / 1000000;
942 calc_cputime_factors();
943 setup_cputime_one_jiffy();
944
945
946
947
948
949
950
951
952
953
954
955 div128_by_32(1000000000, 0, tb_ticks_per_sec, &res);
956 scale = res.result_low;
957 for (shift = 0; res.result_high != 0; ++shift) {
958 scale = (scale >> 1) | (res.result_high << 63);
959 res.result_high >>= 1;
960 }
961 tb_to_ns_scale = scale;
962 tb_to_ns_shift = shift;
963
964 boot_tb = get_tb_or_rtc();
965
966
967 if (timezone_offset) {
968 sys_tz.tz_minuteswest = -timezone_offset / 60;
969 sys_tz.tz_dsttime = 0;
970 }
971
972 vdso_data->tb_update_count = 0;
973 vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
974
975
976
977
978 start_cpu_decrementer();
979
980
981 clocksource_init();
982
983 init_decrementer_clockevent();
984 tick_setup_hrtimer_broadcast();
985
986#ifdef CONFIG_COMMON_CLK
987 of_clk_init(NULL);
988#endif
989}
990
991
992#define FEBRUARY 2
993#define STARTOFTIME 1970
994#define SECDAY 86400L
995#define SECYR (SECDAY * 365)
996#define leapyear(year) ((year) % 4 == 0 && \
997 ((year) % 100 != 0 || (year) % 400 == 0))
998#define days_in_year(a) (leapyear(a) ? 366 : 365)
999#define days_in_month(a) (month_days[(a) - 1])
1000
1001static int month_days[12] = {
1002 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1003};
1004
1005void to_tm(int tim, struct rtc_time * tm)
1006{
1007 register int i;
1008 register long hms, day;
1009
1010 day = tim / SECDAY;
1011 hms = tim % SECDAY;
1012
1013
1014 tm->tm_hour = hms / 3600;
1015 tm->tm_min = (hms % 3600) / 60;
1016 tm->tm_sec = (hms % 3600) % 60;
1017
1018
1019 for (i = STARTOFTIME; day >= days_in_year(i); i++)
1020 day -= days_in_year(i);
1021 tm->tm_year = i;
1022
1023
1024 if (leapyear(tm->tm_year))
1025 days_in_month(FEBRUARY) = 29;
1026 for (i = 1; day >= days_in_month(i); i++)
1027 day -= days_in_month(i);
1028 days_in_month(FEBRUARY) = 28;
1029 tm->tm_mon = i;
1030
1031
1032 tm->tm_mday = day + 1;
1033
1034
1035
1036
1037 tm->tm_wday = -1;
1038}
1039EXPORT_SYMBOL(to_tm);
1040
1041
1042
1043
1044
1045void div128_by_32(u64 dividend_high, u64 dividend_low,
1046 unsigned divisor, struct div_result *dr)
1047{
1048 unsigned long a, b, c, d;
1049 unsigned long w, x, y, z;
1050 u64 ra, rb, rc;
1051
1052 a = dividend_high >> 32;
1053 b = dividend_high & 0xffffffff;
1054 c = dividend_low >> 32;
1055 d = dividend_low & 0xffffffff;
1056
1057 w = a / divisor;
1058 ra = ((u64)(a - (w * divisor)) << 32) + b;
1059
1060 rb = ((u64) do_div(ra, divisor) << 32) + c;
1061 x = ra;
1062
1063 rc = ((u64) do_div(rb, divisor) << 32) + d;
1064 y = rb;
1065
1066 do_div(rc, divisor);
1067 z = rc;
1068
1069 dr->result_high = ((u64)w << 32) + x;
1070 dr->result_low = ((u64)y << 32) + z;
1071
1072}
1073
1074
1075void calibrate_delay(void)
1076{
1077
1078
1079
1080 loops_per_jiffy = tb_ticks_per_jiffy;
1081}
1082
1083static int __init rtc_init(void)
1084{
1085 struct platform_device *pdev;
1086
1087 if (!ppc_md.get_rtc_time)
1088 return -ENODEV;
1089
1090 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
1091
1092 return PTR_ERR_OR_ZERO(pdev);
1093}
1094
1095device_initcall(rtc_init);
1096