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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 <asm/trace.h>
58
59#include <asm/io.h>
60#include <asm/processor.h>
61#include <asm/nvram.h>
62#include <asm/cache.h>
63#include <asm/machdep.h>
64#include <asm/uaccess.h>
65#include <asm/time.h>
66#include <asm/prom.h>
67#include <asm/irq.h>
68#include <asm/div64.h>
69#include <asm/smp.h>
70#include <asm/vdso_datapage.h>
71#include <asm/firmware.h>
72#include <asm/cputime.h>
73
74
75
76#include <linux/clockchips.h>
77#include <linux/timekeeper_internal.h>
78
79static cycle_t rtc_read(struct clocksource *);
80static struct clocksource clocksource_rtc = {
81 .name = "rtc",
82 .rating = 400,
83 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
84 .mask = CLOCKSOURCE_MASK(64),
85 .read = rtc_read,
86};
87
88static cycle_t timebase_read(struct clocksource *);
89static struct clocksource clocksource_timebase = {
90 .name = "timebase",
91 .rating = 400,
92 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
93 .mask = CLOCKSOURCE_MASK(64),
94 .read = timebase_read,
95};
96
97#define DECREMENTER_MAX 0x7fffffff
98
99static int decrementer_set_next_event(unsigned long evt,
100 struct clock_event_device *dev);
101static void decrementer_set_mode(enum clock_event_mode mode,
102 struct clock_event_device *dev);
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_mode = decrementer_set_mode,
110 .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP,
111};
112EXPORT_SYMBOL(decrementer_clockevent);
113
114DEFINE_PER_CPU(u64, decrementers_next_tb);
115static DEFINE_PER_CPU(struct clock_event_device, decrementers);
116
117#define XSEC_PER_SEC (1024*1024)
118
119#ifdef CONFIG_PPC64
120#define SCALE_XSEC(xsec, max) (((xsec) * max) / XSEC_PER_SEC)
121#else
122
123#define SCALE_XSEC(xsec, max) mulhwu((xsec) << 12, max)
124#endif
125
126unsigned long tb_ticks_per_jiffy;
127unsigned long tb_ticks_per_usec = 100;
128EXPORT_SYMBOL(tb_ticks_per_usec);
129unsigned long tb_ticks_per_sec;
130EXPORT_SYMBOL(tb_ticks_per_sec);
131
132DEFINE_SPINLOCK(rtc_lock);
133EXPORT_SYMBOL_GPL(rtc_lock);
134
135static u64 tb_to_ns_scale __read_mostly;
136static unsigned tb_to_ns_shift __read_mostly;
137static u64 boot_tb __read_mostly;
138
139extern struct timezone sys_tz;
140static long timezone_offset;
141
142unsigned long ppc_proc_freq;
143EXPORT_SYMBOL_GPL(ppc_proc_freq);
144unsigned long ppc_tb_freq;
145EXPORT_SYMBOL_GPL(ppc_tb_freq);
146
147#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
148
149
150
151
152
153u64 __cputime_jiffies_factor;
154EXPORT_SYMBOL(__cputime_jiffies_factor);
155u64 __cputime_usec_factor;
156EXPORT_SYMBOL(__cputime_usec_factor);
157u64 __cputime_sec_factor;
158EXPORT_SYMBOL(__cputime_sec_factor);
159u64 __cputime_clockt_factor;
160EXPORT_SYMBOL(__cputime_clockt_factor);
161DEFINE_PER_CPU(unsigned long, cputime_last_delta);
162DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
163
164cputime_t cputime_one_jiffy;
165
166void (*dtl_consumer)(struct dtl_entry *, u64);
167
168static void calc_cputime_factors(void)
169{
170 struct div_result res;
171
172 div128_by_32(HZ, 0, tb_ticks_per_sec, &res);
173 __cputime_jiffies_factor = res.result_low;
174 div128_by_32(1000000, 0, tb_ticks_per_sec, &res);
175 __cputime_usec_factor = res.result_low;
176 div128_by_32(1, 0, tb_ticks_per_sec, &res);
177 __cputime_sec_factor = res.result_low;
178 div128_by_32(USER_HZ, 0, tb_ticks_per_sec, &res);
179 __cputime_clockt_factor = res.result_low;
180}
181
182
183
184
185
186static u64 read_spurr(u64 tb)
187{
188 if (cpu_has_feature(CPU_FTR_SPURR))
189 return mfspr(SPRN_SPURR);
190 if (cpu_has_feature(CPU_FTR_PURR))
191 return mfspr(SPRN_PURR);
192 return tb;
193}
194
195#ifdef CONFIG_PPC_SPLPAR
196
197
198
199
200
201static u64 scan_dispatch_log(u64 stop_tb)
202{
203 u64 i = local_paca->dtl_ridx;
204 struct dtl_entry *dtl = local_paca->dtl_curr;
205 struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
206 struct lppaca *vpa = local_paca->lppaca_ptr;
207 u64 tb_delta;
208 u64 stolen = 0;
209 u64 dtb;
210
211 if (!dtl)
212 return 0;
213
214 if (i == be64_to_cpu(vpa->dtl_idx))
215 return 0;
216 while (i < be64_to_cpu(vpa->dtl_idx)) {
217 dtb = be64_to_cpu(dtl->timebase);
218 tb_delta = be32_to_cpu(dtl->enqueue_to_dispatch_time) +
219 be32_to_cpu(dtl->ready_to_enqueue_time);
220 barrier();
221 if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
222
223 i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
224 dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
225 continue;
226 }
227 if (dtb > stop_tb)
228 break;
229 if (dtl_consumer)
230 dtl_consumer(dtl, i);
231 stolen += tb_delta;
232 ++i;
233 ++dtl;
234 if (dtl == dtl_end)
235 dtl = local_paca->dispatch_log;
236 }
237 local_paca->dtl_ridx = i;
238 local_paca->dtl_curr = dtl;
239 return stolen;
240}
241
242
243
244
245
246void accumulate_stolen_time(void)
247{
248 u64 sst, ust;
249
250 u8 save_soft_enabled = local_paca->soft_enabled;
251
252
253
254
255
256
257
258 local_paca->soft_enabled = 0;
259
260 sst = scan_dispatch_log(local_paca->starttime_user);
261 ust = scan_dispatch_log(local_paca->starttime);
262 local_paca->system_time -= sst;
263 local_paca->user_time -= ust;
264 local_paca->stolen_time += ust + sst;
265
266 local_paca->soft_enabled = save_soft_enabled;
267}
268
269static inline u64 calculate_stolen_time(u64 stop_tb)
270{
271 u64 stolen = 0;
272
273 if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) {
274 stolen = scan_dispatch_log(stop_tb);
275 get_paca()->system_time -= stolen;
276 }
277
278 stolen += get_paca()->stolen_time;
279 get_paca()->stolen_time = 0;
280 return stolen;
281}
282
283#else
284static inline u64 calculate_stolen_time(u64 stop_tb)
285{
286 return 0;
287}
288
289#endif
290
291
292
293
294
295static u64 vtime_delta(struct task_struct *tsk,
296 u64 *sys_scaled, u64 *stolen)
297{
298 u64 now, nowscaled, deltascaled;
299 u64 udelta, delta, user_scaled;
300
301 WARN_ON_ONCE(!irqs_disabled());
302
303 now = mftb();
304 nowscaled = read_spurr(now);
305 get_paca()->system_time += now - get_paca()->starttime;
306 get_paca()->starttime = now;
307 deltascaled = nowscaled - get_paca()->startspurr;
308 get_paca()->startspurr = nowscaled;
309
310 *stolen = calculate_stolen_time(now);
311
312 delta = get_paca()->system_time;
313 get_paca()->system_time = 0;
314 udelta = get_paca()->user_time - get_paca()->utime_sspurr;
315 get_paca()->utime_sspurr = get_paca()->user_time;
316
317
318
319
320
321
322
323
324
325
326
327 *sys_scaled = delta;
328 user_scaled = udelta;
329 if (deltascaled != delta + udelta) {
330 if (udelta) {
331 *sys_scaled = deltascaled * delta / (delta + udelta);
332 user_scaled = deltascaled - *sys_scaled;
333 } else {
334 *sys_scaled = deltascaled;
335 }
336 }
337 get_paca()->user_time_scaled += user_scaled;
338
339 return delta;
340}
341
342void vtime_account_system(struct task_struct *tsk)
343{
344 u64 delta, sys_scaled, stolen;
345
346 delta = vtime_delta(tsk, &sys_scaled, &stolen);
347 account_system_time(tsk, 0, delta, sys_scaled);
348 if (stolen)
349 account_steal_time(stolen);
350}
351EXPORT_SYMBOL_GPL(vtime_account_system);
352
353void vtime_account_idle(struct task_struct *tsk)
354{
355 u64 delta, sys_scaled, stolen;
356
357 delta = vtime_delta(tsk, &sys_scaled, &stolen);
358 account_idle_time(delta + stolen);
359}
360
361
362
363
364
365
366
367
368
369
370void vtime_account_user(struct task_struct *tsk)
371{
372 cputime_t utime, utimescaled;
373
374 utime = get_paca()->user_time;
375 utimescaled = get_paca()->user_time_scaled;
376 get_paca()->user_time = 0;
377 get_paca()->user_time_scaled = 0;
378 get_paca()->utime_sspurr = 0;
379 account_user_time(tsk, utime, utimescaled);
380}
381
382#else
383#define calc_cputime_factors()
384#endif
385
386void __delay(unsigned long loops)
387{
388 unsigned long start;
389 int diff;
390
391 if (__USE_RTC()) {
392 start = get_rtcl();
393 do {
394
395 diff = get_rtcl() - start;
396 if (diff < 0)
397 diff += 1000000000;
398 } while (diff < loops);
399 } else {
400 start = get_tbl();
401 while (get_tbl() - start < loops)
402 HMT_low();
403 HMT_medium();
404 }
405}
406EXPORT_SYMBOL(__delay);
407
408void udelay(unsigned long usecs)
409{
410 __delay(tb_ticks_per_usec * usecs);
411}
412EXPORT_SYMBOL(udelay);
413
414#ifdef CONFIG_SMP
415unsigned long profile_pc(struct pt_regs *regs)
416{
417 unsigned long pc = instruction_pointer(regs);
418
419 if (in_lock_functions(pc))
420 return regs->link;
421
422 return pc;
423}
424EXPORT_SYMBOL(profile_pc);
425#endif
426
427#ifdef CONFIG_IRQ_WORK
428
429
430
431
432#ifdef CONFIG_PPC64
433static inline unsigned long test_irq_work_pending(void)
434{
435 unsigned long x;
436
437 asm volatile("lbz %0,%1(13)"
438 : "=r" (x)
439 : "i" (offsetof(struct paca_struct, irq_work_pending)));
440 return x;
441}
442
443static inline void set_irq_work_pending_flag(void)
444{
445 asm volatile("stb %0,%1(13)" : :
446 "r" (1),
447 "i" (offsetof(struct paca_struct, irq_work_pending)));
448}
449
450static inline void clear_irq_work_pending(void)
451{
452 asm volatile("stb %0,%1(13)" : :
453 "r" (0),
454 "i" (offsetof(struct paca_struct, irq_work_pending)));
455}
456
457#else
458
459DEFINE_PER_CPU(u8, irq_work_pending);
460
461#define set_irq_work_pending_flag() __get_cpu_var(irq_work_pending) = 1
462#define test_irq_work_pending() __get_cpu_var(irq_work_pending)
463#define clear_irq_work_pending() __get_cpu_var(irq_work_pending) = 0
464
465#endif
466
467void arch_irq_work_raise(void)
468{
469 preempt_disable();
470 set_irq_work_pending_flag();
471 set_dec(1);
472 preempt_enable();
473}
474
475#else
476
477#define test_irq_work_pending() 0
478#define clear_irq_work_pending()
479
480#endif
481
482static void __timer_interrupt(void)
483{
484 struct pt_regs *regs = get_irq_regs();
485 u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
486 struct clock_event_device *evt = &__get_cpu_var(decrementers);
487 u64 now;
488
489 trace_timer_interrupt_entry(regs);
490
491 if (test_irq_work_pending()) {
492 clear_irq_work_pending();
493 irq_work_run();
494 }
495
496 now = get_tb_or_rtc();
497 if (now >= *next_tb) {
498 *next_tb = ~(u64)0;
499 if (evt->event_handler)
500 evt->event_handler(evt);
501 __get_cpu_var(irq_stat).timer_irqs_event++;
502 } else {
503 now = *next_tb - now;
504 if (now <= DECREMENTER_MAX)
505 set_dec((int)now);
506
507 if (test_irq_work_pending())
508 set_dec(1);
509 __get_cpu_var(irq_stat).timer_irqs_others++;
510 }
511
512#ifdef CONFIG_PPC64
513
514 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
515 struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);
516 cu->current_tb = mfspr(SPRN_PURR);
517 }
518#endif
519
520 trace_timer_interrupt_exit(regs);
521}
522
523
524
525
526
527void timer_interrupt(struct pt_regs * regs)
528{
529 struct pt_regs *old_regs;
530 u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
531
532
533
534
535 set_dec(DECREMENTER_MAX);
536
537
538
539
540
541
542
543 if (!cpu_online(smp_processor_id())) {
544 *next_tb = ~(u64)0;
545 return;
546 }
547
548
549
550
551 may_hard_irq_enable();
552
553
554#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC)
555 if (atomic_read(&ppc_n_lost_interrupts) != 0)
556 do_IRQ(regs);
557#endif
558
559 old_regs = set_irq_regs(regs);
560 irq_enter();
561
562 __timer_interrupt();
563 irq_exit();
564 set_irq_regs(old_regs);
565}
566
567
568
569
570
571
572void hdec_interrupt(struct pt_regs *regs)
573{
574}
575
576#ifdef CONFIG_SUSPEND
577static void generic_suspend_disable_irqs(void)
578{
579
580
581
582
583 set_dec(DECREMENTER_MAX);
584 local_irq_disable();
585 set_dec(DECREMENTER_MAX);
586}
587
588static void generic_suspend_enable_irqs(void)
589{
590 local_irq_enable();
591}
592
593
594void arch_suspend_disable_irqs(void)
595{
596 if (ppc_md.suspend_disable_irqs)
597 ppc_md.suspend_disable_irqs();
598 generic_suspend_disable_irqs();
599}
600
601
602void arch_suspend_enable_irqs(void)
603{
604 generic_suspend_enable_irqs();
605 if (ppc_md.suspend_enable_irqs)
606 ppc_md.suspend_enable_irqs();
607}
608#endif
609
610
611
612
613
614
615
616
617unsigned long long sched_clock(void)
618{
619 if (__USE_RTC())
620 return get_rtc();
621 return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
622}
623
624static int __init get_freq(char *name, int cells, unsigned long *val)
625{
626 struct device_node *cpu;
627 const __be32 *fp;
628 int found = 0;
629
630
631 cpu = of_find_node_by_type(NULL, "cpu");
632
633 if (cpu) {
634 fp = of_get_property(cpu, name, NULL);
635 if (fp) {
636 found = 1;
637 *val = of_read_ulong(fp, cells);
638 }
639
640 of_node_put(cpu);
641 }
642
643 return found;
644}
645
646static void start_cpu_decrementer(void)
647{
648#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
649
650 mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
651
652
653 mtspr(SPRN_TCR, TCR_DIE);
654#endif
655}
656
657void __init generic_calibrate_decr(void)
658{
659 ppc_tb_freq = DEFAULT_TB_FREQ;
660
661 if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) &&
662 !get_freq("timebase-frequency", 1, &ppc_tb_freq)) {
663
664 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
665 "(not found)\n");
666 }
667
668 ppc_proc_freq = DEFAULT_PROC_FREQ;
669
670 if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) &&
671 !get_freq("clock-frequency", 1, &ppc_proc_freq)) {
672
673 printk(KERN_ERR "WARNING: Estimating processor frequency "
674 "(not found)\n");
675 }
676}
677
678int update_persistent_clock(struct timespec now)
679{
680 struct rtc_time tm;
681
682 if (!ppc_md.set_rtc_time)
683 return -ENODEV;
684
685 to_tm(now.tv_sec + 1 + timezone_offset, &tm);
686 tm.tm_year -= 1900;
687 tm.tm_mon -= 1;
688
689 return ppc_md.set_rtc_time(&tm);
690}
691
692static void __read_persistent_clock(struct timespec *ts)
693{
694 struct rtc_time tm;
695 static int first = 1;
696
697 ts->tv_nsec = 0;
698
699 if (first) {
700 first = 0;
701 if (ppc_md.time_init)
702 timezone_offset = ppc_md.time_init();
703
704
705 if (ppc_md.get_boot_time) {
706 ts->tv_sec = ppc_md.get_boot_time() - timezone_offset;
707 return;
708 }
709 }
710 if (!ppc_md.get_rtc_time) {
711 ts->tv_sec = 0;
712 return;
713 }
714 ppc_md.get_rtc_time(&tm);
715
716 ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
717 tm.tm_hour, tm.tm_min, tm.tm_sec);
718}
719
720void read_persistent_clock(struct timespec *ts)
721{
722 __read_persistent_clock(ts);
723
724
725 if (ts->tv_sec < 0) {
726 ts->tv_sec = 0;
727 ts->tv_nsec = 0;
728 }
729
730}
731
732
733static cycle_t rtc_read(struct clocksource *cs)
734{
735 return (cycle_t)get_rtc();
736}
737
738static cycle_t timebase_read(struct clocksource *cs)
739{
740 return (cycle_t)get_tb();
741}
742
743void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
744 struct clocksource *clock, u32 mult, cycle_t cycle_last)
745{
746 u64 new_tb_to_xs, new_stamp_xsec;
747 u32 frac_sec;
748
749 if (clock != &clocksource_timebase)
750 return;
751
752
753 ++vdso_data->tb_update_count;
754 smp_mb();
755
756
757 new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift);
758 new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
759 do_div(new_stamp_xsec, 1000000000);
760 new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
761
762 BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC);
763
764 frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32;
765
766
767
768
769
770
771
772
773
774
775
776
777 vdso_data->tb_orig_stamp = cycle_last;
778 vdso_data->stamp_xsec = new_stamp_xsec;
779 vdso_data->tb_to_xs = new_tb_to_xs;
780 vdso_data->wtom_clock_sec = wtm->tv_sec;
781 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
782 vdso_data->stamp_xtime = *wall_time;
783 vdso_data->stamp_sec_fraction = frac_sec;
784 smp_wmb();
785 ++(vdso_data->tb_update_count);
786}
787
788void update_vsyscall_tz(void)
789{
790 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
791 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
792}
793
794static void __init clocksource_init(void)
795{
796 struct clocksource *clock;
797
798 if (__USE_RTC())
799 clock = &clocksource_rtc;
800 else
801 clock = &clocksource_timebase;
802
803 if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
804 printk(KERN_ERR "clocksource: %s is already registered\n",
805 clock->name);
806 return;
807 }
808
809 printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n",
810 clock->name, clock->mult, clock->shift);
811}
812
813static int decrementer_set_next_event(unsigned long evt,
814 struct clock_event_device *dev)
815{
816 __get_cpu_var(decrementers_next_tb) = get_tb_or_rtc() + evt;
817 set_dec(evt);
818
819
820 if (test_irq_work_pending())
821 set_dec(1);
822
823 return 0;
824}
825
826static void decrementer_set_mode(enum clock_event_mode mode,
827 struct clock_event_device *dev)
828{
829 if (mode != CLOCK_EVT_MODE_ONESHOT)
830 decrementer_set_next_event(DECREMENTER_MAX, dev);
831}
832
833
834void tick_broadcast_ipi_handler(void)
835{
836 u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
837
838 *next_tb = get_tb_or_rtc();
839 __timer_interrupt();
840}
841
842static void register_decrementer_clockevent(int cpu)
843{
844 struct clock_event_device *dec = &per_cpu(decrementers, cpu);
845
846 *dec = decrementer_clockevent;
847 dec->cpumask = cpumask_of(cpu);
848
849 printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n",
850 dec->name, dec->mult, dec->shift, cpu);
851
852 clockevents_register_device(dec);
853}
854
855static void __init init_decrementer_clockevent(void)
856{
857 int cpu = smp_processor_id();
858
859 clockevents_calc_mult_shift(&decrementer_clockevent, ppc_tb_freq, 4);
860
861 decrementer_clockevent.max_delta_ns =
862 clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent);
863 decrementer_clockevent.min_delta_ns =
864 clockevent_delta2ns(2, &decrementer_clockevent);
865
866 register_decrementer_clockevent(cpu);
867}
868
869void secondary_cpu_time_init(void)
870{
871
872
873
874 start_cpu_decrementer();
875
876
877
878 register_decrementer_clockevent(smp_processor_id());
879}
880
881
882void __init time_init(void)
883{
884 struct div_result res;
885 u64 scale;
886 unsigned shift;
887
888 if (__USE_RTC()) {
889
890 ppc_tb_freq = 1000000000;
891 } else {
892
893 ppc_md.calibrate_decr();
894 printk(KERN_DEBUG "time_init: decrementer frequency = %lu.%.6lu MHz\n",
895 ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
896 printk(KERN_DEBUG "time_init: processor frequency = %lu.%.6lu MHz\n",
897 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
898 }
899
900 tb_ticks_per_jiffy = ppc_tb_freq / HZ;
901 tb_ticks_per_sec = ppc_tb_freq;
902 tb_ticks_per_usec = ppc_tb_freq / 1000000;
903 calc_cputime_factors();
904 setup_cputime_one_jiffy();
905
906
907
908
909
910
911
912
913
914
915
916 div128_by_32(1000000000, 0, tb_ticks_per_sec, &res);
917 scale = res.result_low;
918 for (shift = 0; res.result_high != 0; ++shift) {
919 scale = (scale >> 1) | (res.result_high << 63);
920 res.result_high >>= 1;
921 }
922 tb_to_ns_scale = scale;
923 tb_to_ns_shift = shift;
924
925 boot_tb = get_tb_or_rtc();
926
927
928 if (timezone_offset) {
929 sys_tz.tz_minuteswest = -timezone_offset / 60;
930 sys_tz.tz_dsttime = 0;
931 }
932
933 vdso_data->tb_update_count = 0;
934 vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
935
936
937
938
939 start_cpu_decrementer();
940
941
942 clocksource_init();
943
944 init_decrementer_clockevent();
945 tick_setup_hrtimer_broadcast();
946}
947
948
949#define FEBRUARY 2
950#define STARTOFTIME 1970
951#define SECDAY 86400L
952#define SECYR (SECDAY * 365)
953#define leapyear(year) ((year) % 4 == 0 && \
954 ((year) % 100 != 0 || (year) % 400 == 0))
955#define days_in_year(a) (leapyear(a) ? 366 : 365)
956#define days_in_month(a) (month_days[(a) - 1])
957
958static int month_days[12] = {
959 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
960};
961
962
963
964
965void GregorianDay(struct rtc_time * tm)
966{
967 int leapsToDate;
968 int lastYear;
969 int day;
970 int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
971
972 lastYear = tm->tm_year - 1;
973
974
975
976
977 leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
978
979
980
981
982
983
984
985 day = tm->tm_mon > 2 && leapyear(tm->tm_year);
986
987 day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
988 tm->tm_mday;
989
990 tm->tm_wday = day % 7;
991}
992
993void to_tm(int tim, struct rtc_time * tm)
994{
995 register int i;
996 register long hms, day;
997
998 day = tim / SECDAY;
999 hms = tim % SECDAY;
1000
1001
1002 tm->tm_hour = hms / 3600;
1003 tm->tm_min = (hms % 3600) / 60;
1004 tm->tm_sec = (hms % 3600) % 60;
1005
1006
1007 for (i = STARTOFTIME; day >= days_in_year(i); i++)
1008 day -= days_in_year(i);
1009 tm->tm_year = i;
1010
1011
1012 if (leapyear(tm->tm_year))
1013 days_in_month(FEBRUARY) = 29;
1014 for (i = 1; day >= days_in_month(i); i++)
1015 day -= days_in_month(i);
1016 days_in_month(FEBRUARY) = 28;
1017 tm->tm_mon = i;
1018
1019
1020 tm->tm_mday = day + 1;
1021
1022
1023
1024
1025 GregorianDay(tm);
1026}
1027EXPORT_SYMBOL(to_tm);
1028
1029
1030
1031
1032
1033void div128_by_32(u64 dividend_high, u64 dividend_low,
1034 unsigned divisor, struct div_result *dr)
1035{
1036 unsigned long a, b, c, d;
1037 unsigned long w, x, y, z;
1038 u64 ra, rb, rc;
1039
1040 a = dividend_high >> 32;
1041 b = dividend_high & 0xffffffff;
1042 c = dividend_low >> 32;
1043 d = dividend_low & 0xffffffff;
1044
1045 w = a / divisor;
1046 ra = ((u64)(a - (w * divisor)) << 32) + b;
1047
1048 rb = ((u64) do_div(ra, divisor) << 32) + c;
1049 x = ra;
1050
1051 rc = ((u64) do_div(rb, divisor) << 32) + d;
1052 y = rb;
1053
1054 do_div(rc, divisor);
1055 z = rc;
1056
1057 dr->result_high = ((u64)w << 32) + x;
1058 dr->result_low = ((u64)y << 32) + z;
1059
1060}
1061
1062
1063void calibrate_delay(void)
1064{
1065
1066
1067
1068 loops_per_jiffy = tb_ticks_per_jiffy;
1069}
1070
1071static int __init rtc_init(void)
1072{
1073 struct platform_device *pdev;
1074
1075 if (!ppc_md.get_rtc_time)
1076 return -ENODEV;
1077
1078 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
1079
1080 return PTR_ERR_OR_ZERO(pdev);
1081}
1082
1083module_init(rtc_init);
1084