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15#define KMSG_COMPONENT "time"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/kernel_stat.h>
19#include <linux/errno.h>
20#include <linux/module.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/param.h>
24#include <linux/string.h>
25#include <linux/mm.h>
26#include <linux/interrupt.h>
27#include <linux/cpu.h>
28#include <linux/stop_machine.h>
29#include <linux/time.h>
30#include <linux/sysdev.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/smp.h>
34#include <linux/types.h>
35#include <linux/profile.h>
36#include <linux/timex.h>
37#include <linux/notifier.h>
38#include <linux/clocksource.h>
39#include <linux/clockchips.h>
40#include <linux/gfp.h>
41#include <linux/kprobes.h>
42#include <asm/uaccess.h>
43#include <asm/delay.h>
44#include <asm/s390_ext.h>
45#include <asm/div64.h>
46#include <asm/vdso.h>
47#include <asm/irq.h>
48#include <asm/irq_regs.h>
49#include <asm/timer.h>
50#include <asm/etr.h>
51#include <asm/cio.h>
52
53
54#define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
55#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
56
57u64 sched_clock_base_cc = -1;
58EXPORT_SYMBOL_GPL(sched_clock_base_cc);
59
60static DEFINE_PER_CPU(struct clock_event_device, comparators);
61
62
63
64
65unsigned long long notrace __kprobes sched_clock(void)
66{
67 return (get_clock_monotonic() * 125) >> 9;
68}
69
70
71
72
73unsigned long long monotonic_clock(void)
74{
75 return sched_clock();
76}
77EXPORT_SYMBOL(monotonic_clock);
78
79void tod_to_timeval(__u64 todval, struct timespec *xt)
80{
81 unsigned long long sec;
82
83 sec = todval >> 12;
84 do_div(sec, 1000000);
85 xt->tv_sec = sec;
86 todval -= (sec * 1000000) << 12;
87 xt->tv_nsec = ((todval * 1000) >> 12);
88}
89EXPORT_SYMBOL(tod_to_timeval);
90
91void clock_comparator_work(void)
92{
93 struct clock_event_device *cd;
94
95 S390_lowcore.clock_comparator = -1ULL;
96 set_clock_comparator(S390_lowcore.clock_comparator);
97 cd = &__get_cpu_var(comparators);
98 cd->event_handler(cd);
99}
100
101
102
103
104static void fixup_clock_comparator(unsigned long long delta)
105{
106
107 if (S390_lowcore.clock_comparator == -1ULL)
108 return;
109 S390_lowcore.clock_comparator += delta;
110 set_clock_comparator(S390_lowcore.clock_comparator);
111}
112
113static int s390_next_event(unsigned long delta,
114 struct clock_event_device *evt)
115{
116 S390_lowcore.clock_comparator = get_clock() + delta;
117 set_clock_comparator(S390_lowcore.clock_comparator);
118 return 0;
119}
120
121static void s390_set_mode(enum clock_event_mode mode,
122 struct clock_event_device *evt)
123{
124}
125
126
127
128
129
130void init_cpu_timer(void)
131{
132 struct clock_event_device *cd;
133 int cpu;
134
135 S390_lowcore.clock_comparator = -1ULL;
136 set_clock_comparator(S390_lowcore.clock_comparator);
137
138 cpu = smp_processor_id();
139 cd = &per_cpu(comparators, cpu);
140 cd->name = "comparator";
141 cd->features = CLOCK_EVT_FEAT_ONESHOT;
142 cd->mult = 16777;
143 cd->shift = 12;
144 cd->min_delta_ns = 1;
145 cd->max_delta_ns = LONG_MAX;
146 cd->rating = 400;
147 cd->cpumask = cpumask_of(cpu);
148 cd->set_next_event = s390_next_event;
149 cd->set_mode = s390_set_mode;
150
151 clockevents_register_device(cd);
152
153
154 __ctl_set_bit(0,11);
155
156
157 __ctl_set_bit(0, 4);
158}
159
160static void clock_comparator_interrupt(unsigned int ext_int_code,
161 unsigned int param32,
162 unsigned long param64)
163{
164 kstat_cpu(smp_processor_id()).irqs[EXTINT_CLK]++;
165 if (S390_lowcore.clock_comparator == -1ULL)
166 set_clock_comparator(S390_lowcore.clock_comparator);
167}
168
169static void etr_timing_alert(struct etr_irq_parm *);
170static void stp_timing_alert(struct stp_irq_parm *);
171
172static void timing_alert_interrupt(unsigned int ext_int_code,
173 unsigned int param32, unsigned long param64)
174{
175 kstat_cpu(smp_processor_id()).irqs[EXTINT_TLA]++;
176 if (param32 & 0x00c40000)
177 etr_timing_alert((struct etr_irq_parm *) ¶m32);
178 if (param32 & 0x00038000)
179 stp_timing_alert((struct stp_irq_parm *) ¶m32);
180}
181
182static void etr_reset(void);
183static void stp_reset(void);
184
185void read_persistent_clock(struct timespec *ts)
186{
187 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
188}
189
190void read_boot_clock(struct timespec *ts)
191{
192 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
193}
194
195static cycle_t read_tod_clock(struct clocksource *cs)
196{
197 return get_clock();
198}
199
200static struct clocksource clocksource_tod = {
201 .name = "tod",
202 .rating = 400,
203 .read = read_tod_clock,
204 .mask = -1ULL,
205 .mult = 1000,
206 .shift = 12,
207 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
208};
209
210struct clocksource * __init clocksource_default_clock(void)
211{
212 return &clocksource_tod;
213}
214
215void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
216 struct clocksource *clock, u32 mult)
217{
218 if (clock != &clocksource_tod)
219 return;
220
221
222 ++vdso_data->tb_update_count;
223 smp_wmb();
224 vdso_data->xtime_tod_stamp = clock->cycle_last;
225 vdso_data->xtime_clock_sec = wall_time->tv_sec;
226 vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
227 vdso_data->wtom_clock_sec = wtm->tv_sec;
228 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
229 vdso_data->ntp_mult = mult;
230 smp_wmb();
231 ++vdso_data->tb_update_count;
232}
233
234extern struct timezone sys_tz;
235
236void update_vsyscall_tz(void)
237{
238
239 ++vdso_data->tb_update_count;
240 smp_wmb();
241 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
242 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
243 smp_wmb();
244 ++vdso_data->tb_update_count;
245}
246
247
248
249
250
251void __init time_init(void)
252{
253
254 etr_reset();
255 stp_reset();
256
257
258 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
259 panic("Couldn't request external interrupt 0x1004");
260
261
262 if (register_external_interrupt(0x1406, timing_alert_interrupt))
263 panic("Couldn't request external interrupt 0x1406");
264
265 if (clocksource_register(&clocksource_tod) != 0)
266 panic("Could not register TOD clock source");
267
268
269 init_cpu_timer();
270
271
272 vtime_init();
273}
274
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279
280
281
282static unsigned long long adjust_time(unsigned long long old,
283 unsigned long long clock,
284 unsigned long long delay)
285{
286 unsigned long long delta, ticks;
287 struct timex adjust;
288
289 if (clock > old) {
290
291 delta = ticks = clock - old;
292 delta = ticks = (delta < delay) ? 0 : delta - delay;
293 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
294 adjust.offset = ticks * (1000000 / HZ);
295 } else {
296
297 delta = ticks = old - clock;
298 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
299 delta = -delta;
300 adjust.offset = -ticks * (1000000 / HZ);
301 }
302 sched_clock_base_cc += delta;
303 if (adjust.offset != 0) {
304 pr_notice("The ETR interface has adjusted the clock "
305 "by %li microseconds\n", adjust.offset);
306 adjust.modes = ADJ_OFFSET_SINGLESHOT;
307 do_adjtimex(&adjust);
308 }
309 return delta;
310}
311
312static DEFINE_PER_CPU(atomic_t, clock_sync_word);
313static DEFINE_MUTEX(clock_sync_mutex);
314static unsigned long clock_sync_flags;
315
316#define CLOCK_SYNC_HAS_ETR 0
317#define CLOCK_SYNC_HAS_STP 1
318#define CLOCK_SYNC_ETR 2
319#define CLOCK_SYNC_STP 3
320
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326
327
328int get_sync_clock(unsigned long long *clock)
329{
330 atomic_t *sw_ptr;
331 unsigned int sw0, sw1;
332
333 sw_ptr = &get_cpu_var(clock_sync_word);
334 sw0 = atomic_read(sw_ptr);
335 *clock = get_clock();
336 sw1 = atomic_read(sw_ptr);
337 put_cpu_var(clock_sync_word);
338 if (sw0 == sw1 && (sw0 & 0x80000000U))
339
340 return 0;
341 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
342 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
343 return -ENOSYS;
344 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
345 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
346 return -EACCES;
347 return -EAGAIN;
348}
349EXPORT_SYMBOL(get_sync_clock);
350
351
352
353
354static void disable_sync_clock(void *dummy)
355{
356 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
357
358
359
360
361
362
363 atomic_clear_mask(0x80000000, sw_ptr);
364 atomic_inc(sw_ptr);
365}
366
367
368
369
370
371static void enable_sync_clock(void)
372{
373 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
374 atomic_set_mask(0x80000000, sw_ptr);
375}
376
377
378
379
380static inline int check_sync_clock(void)
381{
382 atomic_t *sw_ptr;
383 int rc;
384
385 sw_ptr = &get_cpu_var(clock_sync_word);
386 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
387 put_cpu_var(clock_sync_word);
388 return rc;
389}
390
391
392static struct workqueue_struct *time_sync_wq;
393
394static void __init time_init_wq(void)
395{
396 if (time_sync_wq)
397 return;
398 time_sync_wq = create_singlethread_workqueue("timesync");
399}
400
401
402
403
404static int etr_port0_online;
405static int etr_port1_online;
406static int etr_steai_available;
407
408static int __init early_parse_etr(char *p)
409{
410 if (strncmp(p, "off", 3) == 0)
411 etr_port0_online = etr_port1_online = 0;
412 else if (strncmp(p, "port0", 5) == 0)
413 etr_port0_online = 1;
414 else if (strncmp(p, "port1", 5) == 0)
415 etr_port1_online = 1;
416 else if (strncmp(p, "on", 2) == 0)
417 etr_port0_online = etr_port1_online = 1;
418 return 0;
419}
420early_param("etr", early_parse_etr);
421
422enum etr_event {
423 ETR_EVENT_PORT0_CHANGE,
424 ETR_EVENT_PORT1_CHANGE,
425 ETR_EVENT_PORT_ALERT,
426 ETR_EVENT_SYNC_CHECK,
427 ETR_EVENT_SWITCH_LOCAL,
428 ETR_EVENT_UPDATE,
429};
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454
455static struct etr_eacr etr_eacr;
456static u64 etr_tolec;
457static struct etr_aib etr_port0;
458static int etr_port0_uptodate;
459static struct etr_aib etr_port1;
460static int etr_port1_uptodate;
461static unsigned long etr_events;
462static struct timer_list etr_timer;
463
464static void etr_timeout(unsigned long dummy);
465static void etr_work_fn(struct work_struct *work);
466static DEFINE_MUTEX(etr_work_mutex);
467static DECLARE_WORK(etr_work, etr_work_fn);
468
469
470
471
472static void etr_reset(void)
473{
474 etr_eacr = (struct etr_eacr) {
475 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
476 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
477 .es = 0, .sl = 0 };
478 if (etr_setr(&etr_eacr) == 0) {
479 etr_tolec = get_clock();
480 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
481 if (etr_port0_online && etr_port1_online)
482 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
483 } else if (etr_port0_online || etr_port1_online) {
484 pr_warning("The real or virtual hardware system does "
485 "not provide an ETR interface\n");
486 etr_port0_online = etr_port1_online = 0;
487 }
488}
489
490static int __init etr_init(void)
491{
492 struct etr_aib aib;
493
494 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
495 return 0;
496 time_init_wq();
497
498 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
499 etr_steai_available = 1;
500 setup_timer(&etr_timer, etr_timeout, 0UL);
501 if (etr_port0_online) {
502 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
503 queue_work(time_sync_wq, &etr_work);
504 }
505 if (etr_port1_online) {
506 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
507 queue_work(time_sync_wq, &etr_work);
508 }
509 return 0;
510}
511
512arch_initcall(etr_init);
513
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525
526
527void etr_switch_to_local(void)
528{
529 if (!etr_eacr.sl)
530 return;
531 disable_sync_clock(NULL);
532 if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) {
533 etr_eacr.es = etr_eacr.sl = 0;
534 etr_setr(&etr_eacr);
535 queue_work(time_sync_wq, &etr_work);
536 }
537}
538
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540
541
542
543
544
545void etr_sync_check(void)
546{
547 if (!etr_eacr.es)
548 return;
549 disable_sync_clock(NULL);
550 if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) {
551 etr_eacr.es = 0;
552 etr_setr(&etr_eacr);
553 queue_work(time_sync_wq, &etr_work);
554 }
555}
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562
563
564static void etr_timing_alert(struct etr_irq_parm *intparm)
565{
566 if (intparm->pc0)
567
568 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
569 if (intparm->pc1)
570
571 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
572 if (intparm->eai)
573
574
575
576
577 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
578 queue_work(time_sync_wq, &etr_work);
579}
580
581static void etr_timeout(unsigned long dummy)
582{
583 set_bit(ETR_EVENT_UPDATE, &etr_events);
584 queue_work(time_sync_wq, &etr_work);
585}
586
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588
589
590static inline int etr_mode_is_pps(struct etr_eacr eacr)
591{
592 return eacr.es && !eacr.sl;
593}
594
595
596
597
598static inline int etr_mode_is_etr(struct etr_eacr eacr)
599{
600 return eacr.es && eacr.sl;
601}
602
603
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608
609
610static int etr_port_valid(struct etr_aib *aib, int port)
611{
612 unsigned int psc;
613
614
615 if (aib->tsp == 0)
616 return 0;
617
618 psc = port ? aib->esw.psc1 : aib->esw.psc0;
619 if (psc == etr_lpsc_pps_mode)
620 return 1;
621 if (psc == etr_lpsc_operational_step)
622 return !aib->esw.y && aib->slsw.v1 &&
623 aib->slsw.v2 && aib->slsw.v3;
624 return 0;
625}
626
627
628
629
630static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
631{
632
633 return aib1->edf1.net_id == aib2->edf1.net_id;
634}
635
636
637
638
639
640
641static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
642{
643 BUG_ON(etr_steai(aib, func) != 0);
644
645 if (aib->esw.psc0 == 1)
646 aib->esw.psc0 = 2;
647 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
648 aib->esw.psc0 = 1;
649 if (aib->esw.psc1 == 1)
650 aib->esw.psc1 = 2;
651 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
652 aib->esw.psc1 = 1;
653}
654
655
656
657
658
659static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
660{
661 int state_a1, state_a2;
662
663
664 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
665 a1->esw.eacr.e1 != a2->esw.eacr.e1)
666 return 0;
667
668
669 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
670 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
671 if (state_a1 == etr_lpsc_operational_step) {
672 if (state_a2 != etr_lpsc_operational_step ||
673 a1->edf1.net_id != a2->edf1.net_id ||
674 a1->edf1.etr_id != a2->edf1.etr_id ||
675 a1->edf1.etr_pn != a2->edf1.etr_pn)
676 return 0;
677 } else if (state_a2 != etr_lpsc_pps_mode)
678 return 0;
679
680
681 if (a1->edf2.etv + 1 != a2->edf2.etv)
682 return 0;
683
684 if (!etr_port_valid(a2, p))
685 return 0;
686
687 return 1;
688}
689
690struct clock_sync_data {
691 atomic_t cpus;
692 int in_sync;
693 unsigned long long fixup_cc;
694 int etr_port;
695 struct etr_aib *etr_aib;
696};
697
698static void clock_sync_cpu(struct clock_sync_data *sync)
699{
700 atomic_dec(&sync->cpus);
701 enable_sync_clock();
702
703
704
705
706
707
708 while (sync->in_sync == 0) {
709 __udelay(1);
710
711
712
713
714 barrier();
715 }
716 if (sync->in_sync != 1)
717
718 disable_sync_clock(NULL);
719
720
721
722
723 fixup_clock_comparator(sync->fixup_cc);
724}
725
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729
730
731static int etr_sync_clock(void *data)
732{
733 static int first;
734 unsigned long long clock, old_clock, delay, delta;
735 struct clock_sync_data *etr_sync;
736 struct etr_aib *sync_port, *aib;
737 int port;
738 int rc;
739
740 etr_sync = data;
741
742 if (xchg(&first, 1) == 1) {
743
744 clock_sync_cpu(etr_sync);
745 return 0;
746 }
747
748
749 while (atomic_read(&etr_sync->cpus) != 0)
750 cpu_relax();
751
752 port = etr_sync->etr_port;
753 aib = etr_sync->etr_aib;
754 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
755 enable_sync_clock();
756
757
758 __ctl_set_bit(14, 21);
759 __ctl_set_bit(0, 29);
760 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
761 old_clock = get_clock();
762 if (set_clock(clock) == 0) {
763 __udelay(1);
764 __ctl_clear_bit(0, 29);
765 __ctl_clear_bit(14, 21);
766 etr_stetr(aib);
767
768 delay = (unsigned long long)
769 (aib->edf2.etv - sync_port->edf2.etv) << 32;
770 delta = adjust_time(old_clock, clock, delay);
771 etr_sync->fixup_cc = delta;
772 fixup_clock_comparator(delta);
773
774 if (!etr_aib_follows(sync_port, aib, port)) {
775
776 disable_sync_clock(NULL);
777 etr_sync->in_sync = -EAGAIN;
778 rc = -EAGAIN;
779 } else {
780 etr_sync->in_sync = 1;
781 rc = 0;
782 }
783 } else {
784
785 __ctl_clear_bit(0, 29);
786 __ctl_clear_bit(14, 21);
787 disable_sync_clock(NULL);
788 etr_sync->in_sync = -EAGAIN;
789 rc = -EAGAIN;
790 }
791 xchg(&first, 0);
792 return rc;
793}
794
795static int etr_sync_clock_stop(struct etr_aib *aib, int port)
796{
797 struct clock_sync_data etr_sync;
798 struct etr_aib *sync_port;
799 int follows;
800 int rc;
801
802
803 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
804 follows = etr_aib_follows(sync_port, aib, port);
805 memcpy(sync_port, aib, sizeof(*aib));
806 if (!follows)
807 return -EAGAIN;
808 memset(&etr_sync, 0, sizeof(etr_sync));
809 etr_sync.etr_aib = aib;
810 etr_sync.etr_port = port;
811 get_online_cpus();
812 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
813 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
814 put_online_cpus();
815 return rc;
816}
817
818
819
820
821
822static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
823{
824 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
825 eacr.es = 0;
826 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
827 eacr.es = eacr.sl = 0;
828 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
829 etr_port0_uptodate = etr_port1_uptodate = 0;
830
831 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
832 if (eacr.e0)
833
834
835
836
837
838 etr_tolec = get_clock();
839 eacr.p0 = etr_port0_online;
840 if (!eacr.p0)
841 eacr.e0 = 0;
842 etr_port0_uptodate = 0;
843 }
844 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
845 if (eacr.e1)
846
847
848
849
850
851 etr_tolec = get_clock();
852 eacr.p1 = etr_port1_online;
853 if (!eacr.p1)
854 eacr.e1 = 0;
855 etr_port1_uptodate = 0;
856 }
857 clear_bit(ETR_EVENT_UPDATE, &etr_events);
858 return eacr;
859}
860
861
862
863
864
865static void etr_set_tolec_timeout(unsigned long long now)
866{
867 unsigned long micros;
868
869 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
870 (!etr_eacr.p1 || etr_port1_uptodate))
871 return;
872 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
873 micros = (micros > 1600000) ? 0 : 1600000 - micros;
874 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
875}
876
877
878
879
880static void etr_set_sync_timeout(void)
881{
882 mod_timer(&etr_timer, jiffies + HZ/2);
883}
884
885
886
887
888static struct etr_eacr etr_handle_update(struct etr_aib *aib,
889 struct etr_eacr eacr)
890{
891
892 if (!eacr.e0 && !eacr.e1)
893 return eacr;
894
895
896 if (aib->esw.q == 0) {
897
898 if (eacr.p0 && !etr_port0_uptodate) {
899 etr_port0 = *aib;
900 if (etr_port0_online)
901 etr_port0_uptodate = 1;
902 }
903 } else {
904
905 if (eacr.p1 && !etr_port1_uptodate) {
906 etr_port1 = *aib;
907 if (etr_port0_online)
908 etr_port1_uptodate = 1;
909 }
910 }
911
912
913
914
915
916 if (!eacr.es || !check_sync_clock())
917 return eacr;
918
919
920
921
922
923
924 if (etr_steai_available) {
925 if (eacr.p0 && !etr_port0_uptodate) {
926 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
927 etr_port0_uptodate = 1;
928 }
929 if (eacr.p1 && !etr_port1_uptodate) {
930 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
931 etr_port1_uptodate = 1;
932 }
933 } else {
934
935
936
937
938 if ((eacr.p0 && !etr_port0_uptodate) ||
939 (eacr.p1 && !etr_port1_uptodate))
940 eacr.dp ^= 1;
941 else
942 eacr.dp = 0;
943 }
944 return eacr;
945}
946
947
948
949
950
951static void etr_update_eacr(struct etr_eacr eacr)
952{
953 int dp_changed;
954
955 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
956
957 return;
958
959
960
961
962 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
963 (etr_eacr.dp ^ eacr.dp) != 0;
964 etr_eacr = eacr;
965 etr_setr(&etr_eacr);
966 if (dp_changed)
967 etr_tolec = get_clock();
968}
969
970
971
972
973
974
975static void etr_work_fn(struct work_struct *work)
976{
977 unsigned long long now;
978 struct etr_eacr eacr;
979 struct etr_aib aib;
980 int sync_port;
981
982
983 mutex_lock(&etr_work_mutex);
984
985
986 eacr = etr_eacr;
987
988
989 eacr = etr_handle_events(eacr);
990
991
992 eacr.ea = eacr.p0 || eacr.p1;
993 if (!eacr.ea) {
994
995 eacr.dp = eacr.es = eacr.sl = 0;
996 on_each_cpu(disable_sync_clock, NULL, 1);
997 del_timer_sync(&etr_timer);
998 etr_update_eacr(eacr);
999 goto out_unlock;
1000 }
1001
1002
1003 BUG_ON(etr_stetr(&aib) != 0);
1004 etr_port0.esw = etr_port1.esw = aib.esw;
1005 now = get_clock();
1006
1007
1008
1009
1010
1011 if (now >= etr_tolec + (1600000 << 12))
1012 eacr = etr_handle_update(&aib, eacr);
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1028 eacr.sl = 0;
1029 eacr.e0 = 1;
1030 if (!etr_mode_is_pps(etr_eacr))
1031 eacr.es = 0;
1032 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1033 eacr.e1 = 0;
1034
1035 else if (etr_port0_uptodate && etr_port1_uptodate)
1036 eacr.e1 = 1;
1037 sync_port = (etr_port0_uptodate &&
1038 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1039 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1040 eacr.sl = 0;
1041 eacr.e0 = 0;
1042 eacr.e1 = 1;
1043 if (!etr_mode_is_pps(etr_eacr))
1044 eacr.es = 0;
1045 sync_port = (etr_port1_uptodate &&
1046 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1047 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1048 eacr.sl = 1;
1049 eacr.e0 = 1;
1050 if (!etr_mode_is_etr(etr_eacr))
1051 eacr.es = 0;
1052 if (!eacr.es || !eacr.p1 ||
1053 aib.esw.psc1 != etr_lpsc_operational_alt)
1054 eacr.e1 = 0;
1055 else if (etr_port0_uptodate && etr_port1_uptodate &&
1056 etr_compare_network(&etr_port0, &etr_port1))
1057 eacr.e1 = 1;
1058 sync_port = (etr_port0_uptodate &&
1059 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1060 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1061 eacr.sl = 1;
1062 eacr.e0 = 0;
1063 eacr.e1 = 1;
1064 if (!etr_mode_is_etr(etr_eacr))
1065 eacr.es = 0;
1066 sync_port = (etr_port1_uptodate &&
1067 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1068 } else {
1069
1070 eacr.es = eacr.sl = 0;
1071 sync_port = -1;
1072 }
1073
1074
1075
1076
1077
1078 if ((eacr.es && check_sync_clock()) || sync_port < 0) {
1079 etr_update_eacr(eacr);
1080 etr_set_tolec_timeout(now);
1081 goto out_unlock;
1082 }
1083
1084
1085
1086
1087
1088 eacr.dp = 0;
1089 eacr.es = 1;
1090
1091
1092
1093
1094
1095
1096
1097
1098 etr_update_eacr(eacr);
1099 if (now < etr_tolec + (1600000 << 12) ||
1100 etr_sync_clock_stop(&aib, sync_port) != 0) {
1101
1102 eacr.es = 0;
1103 etr_update_eacr(eacr);
1104 etr_set_sync_timeout();
1105 } else
1106 etr_set_tolec_timeout(now);
1107out_unlock:
1108 mutex_unlock(&etr_work_mutex);
1109}
1110
1111
1112
1113
1114static struct sysdev_class etr_sysclass = {
1115 .name = "etr",
1116};
1117
1118static struct sys_device etr_port0_dev = {
1119 .id = 0,
1120 .cls = &etr_sysclass,
1121};
1122
1123static struct sys_device etr_port1_dev = {
1124 .id = 1,
1125 .cls = &etr_sysclass,
1126};
1127
1128
1129
1130
1131static ssize_t etr_stepping_port_show(struct sysdev_class *class,
1132 struct sysdev_class_attribute *attr,
1133 char *buf)
1134{
1135 return sprintf(buf, "%i\n", etr_port0.esw.p);
1136}
1137
1138static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1139
1140static ssize_t etr_stepping_mode_show(struct sysdev_class *class,
1141 struct sysdev_class_attribute *attr,
1142 char *buf)
1143{
1144 char *mode_str;
1145
1146 if (etr_mode_is_pps(etr_eacr))
1147 mode_str = "pps";
1148 else if (etr_mode_is_etr(etr_eacr))
1149 mode_str = "etr";
1150 else
1151 mode_str = "local";
1152 return sprintf(buf, "%s\n", mode_str);
1153}
1154
1155static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1156
1157
1158
1159
1160static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1161{
1162 if (dev == &etr_port0_dev)
1163 return etr_port0_online ? &etr_port0 : NULL;
1164 else
1165 return etr_port1_online ? &etr_port1 : NULL;
1166}
1167
1168static ssize_t etr_online_show(struct sys_device *dev,
1169 struct sysdev_attribute *attr,
1170 char *buf)
1171{
1172 unsigned int online;
1173
1174 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1175 return sprintf(buf, "%i\n", online);
1176}
1177
1178static ssize_t etr_online_store(struct sys_device *dev,
1179 struct sysdev_attribute *attr,
1180 const char *buf, size_t count)
1181{
1182 unsigned int value;
1183
1184 value = simple_strtoul(buf, NULL, 0);
1185 if (value != 0 && value != 1)
1186 return -EINVAL;
1187 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1188 return -EOPNOTSUPP;
1189 mutex_lock(&clock_sync_mutex);
1190 if (dev == &etr_port0_dev) {
1191 if (etr_port0_online == value)
1192 goto out;
1193 etr_port0_online = value;
1194 if (etr_port0_online && etr_port1_online)
1195 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1196 else
1197 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1198 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1199 queue_work(time_sync_wq, &etr_work);
1200 } else {
1201 if (etr_port1_online == value)
1202 goto out;
1203 etr_port1_online = value;
1204 if (etr_port0_online && etr_port1_online)
1205 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1206 else
1207 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1208 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1209 queue_work(time_sync_wq, &etr_work);
1210 }
1211out:
1212 mutex_unlock(&clock_sync_mutex);
1213 return count;
1214}
1215
1216static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1217
1218static ssize_t etr_stepping_control_show(struct sys_device *dev,
1219 struct sysdev_attribute *attr,
1220 char *buf)
1221{
1222 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1223 etr_eacr.e0 : etr_eacr.e1);
1224}
1225
1226static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1227
1228static ssize_t etr_mode_code_show(struct sys_device *dev,
1229 struct sysdev_attribute *attr, char *buf)
1230{
1231 if (!etr_port0_online && !etr_port1_online)
1232
1233 return -ENODATA;
1234 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1235 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1236}
1237
1238static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1239
1240static ssize_t etr_untuned_show(struct sys_device *dev,
1241 struct sysdev_attribute *attr, char *buf)
1242{
1243 struct etr_aib *aib = etr_aib_from_dev(dev);
1244
1245 if (!aib || !aib->slsw.v1)
1246 return -ENODATA;
1247 return sprintf(buf, "%i\n", aib->edf1.u);
1248}
1249
1250static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1251
1252static ssize_t etr_network_id_show(struct sys_device *dev,
1253 struct sysdev_attribute *attr, char *buf)
1254{
1255 struct etr_aib *aib = etr_aib_from_dev(dev);
1256
1257 if (!aib || !aib->slsw.v1)
1258 return -ENODATA;
1259 return sprintf(buf, "%i\n", aib->edf1.net_id);
1260}
1261
1262static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1263
1264static ssize_t etr_id_show(struct sys_device *dev,
1265 struct sysdev_attribute *attr, char *buf)
1266{
1267 struct etr_aib *aib = etr_aib_from_dev(dev);
1268
1269 if (!aib || !aib->slsw.v1)
1270 return -ENODATA;
1271 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1272}
1273
1274static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1275
1276static ssize_t etr_port_number_show(struct sys_device *dev,
1277 struct sysdev_attribute *attr, char *buf)
1278{
1279 struct etr_aib *aib = etr_aib_from_dev(dev);
1280
1281 if (!aib || !aib->slsw.v1)
1282 return -ENODATA;
1283 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1284}
1285
1286static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1287
1288static ssize_t etr_coupled_show(struct sys_device *dev,
1289 struct sysdev_attribute *attr, char *buf)
1290{
1291 struct etr_aib *aib = etr_aib_from_dev(dev);
1292
1293 if (!aib || !aib->slsw.v3)
1294 return -ENODATA;
1295 return sprintf(buf, "%i\n", aib->edf3.c);
1296}
1297
1298static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1299
1300static ssize_t etr_local_time_show(struct sys_device *dev,
1301 struct sysdev_attribute *attr, char *buf)
1302{
1303 struct etr_aib *aib = etr_aib_from_dev(dev);
1304
1305 if (!aib || !aib->slsw.v3)
1306 return -ENODATA;
1307 return sprintf(buf, "%i\n", aib->edf3.blto);
1308}
1309
1310static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1311
1312static ssize_t etr_utc_offset_show(struct sys_device *dev,
1313 struct sysdev_attribute *attr, char *buf)
1314{
1315 struct etr_aib *aib = etr_aib_from_dev(dev);
1316
1317 if (!aib || !aib->slsw.v3)
1318 return -ENODATA;
1319 return sprintf(buf, "%i\n", aib->edf3.buo);
1320}
1321
1322static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1323
1324static struct sysdev_attribute *etr_port_attributes[] = {
1325 &attr_online,
1326 &attr_stepping_control,
1327 &attr_state_code,
1328 &attr_untuned,
1329 &attr_network,
1330 &attr_id,
1331 &attr_port,
1332 &attr_coupled,
1333 &attr_local_time,
1334 &attr_utc_offset,
1335 NULL
1336};
1337
1338static int __init etr_register_port(struct sys_device *dev)
1339{
1340 struct sysdev_attribute **attr;
1341 int rc;
1342
1343 rc = sysdev_register(dev);
1344 if (rc)
1345 goto out;
1346 for (attr = etr_port_attributes; *attr; attr++) {
1347 rc = sysdev_create_file(dev, *attr);
1348 if (rc)
1349 goto out_unreg;
1350 }
1351 return 0;
1352out_unreg:
1353 for (; attr >= etr_port_attributes; attr--)
1354 sysdev_remove_file(dev, *attr);
1355 sysdev_unregister(dev);
1356out:
1357 return rc;
1358}
1359
1360static void __init etr_unregister_port(struct sys_device *dev)
1361{
1362 struct sysdev_attribute **attr;
1363
1364 for (attr = etr_port_attributes; *attr; attr++)
1365 sysdev_remove_file(dev, *attr);
1366 sysdev_unregister(dev);
1367}
1368
1369static int __init etr_init_sysfs(void)
1370{
1371 int rc;
1372
1373 rc = sysdev_class_register(&etr_sysclass);
1374 if (rc)
1375 goto out;
1376 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1377 if (rc)
1378 goto out_unreg_class;
1379 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1380 if (rc)
1381 goto out_remove_stepping_port;
1382 rc = etr_register_port(&etr_port0_dev);
1383 if (rc)
1384 goto out_remove_stepping_mode;
1385 rc = etr_register_port(&etr_port1_dev);
1386 if (rc)
1387 goto out_remove_port0;
1388 return 0;
1389
1390out_remove_port0:
1391 etr_unregister_port(&etr_port0_dev);
1392out_remove_stepping_mode:
1393 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1394out_remove_stepping_port:
1395 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1396out_unreg_class:
1397 sysdev_class_unregister(&etr_sysclass);
1398out:
1399 return rc;
1400}
1401
1402device_initcall(etr_init_sysfs);
1403
1404
1405
1406
1407static int stp_online;
1408static struct stp_sstpi stp_info;
1409static void *stp_page;
1410
1411static void stp_work_fn(struct work_struct *work);
1412static DEFINE_MUTEX(stp_work_mutex);
1413static DECLARE_WORK(stp_work, stp_work_fn);
1414static struct timer_list stp_timer;
1415
1416static int __init early_parse_stp(char *p)
1417{
1418 if (strncmp(p, "off", 3) == 0)
1419 stp_online = 0;
1420 else if (strncmp(p, "on", 2) == 0)
1421 stp_online = 1;
1422 return 0;
1423}
1424early_param("stp", early_parse_stp);
1425
1426
1427
1428
1429static void __init stp_reset(void)
1430{
1431 int rc;
1432
1433 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1434 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1435 if (rc == 0)
1436 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1437 else if (stp_online) {
1438 pr_warning("The real or virtual hardware system does "
1439 "not provide an STP interface\n");
1440 free_page((unsigned long) stp_page);
1441 stp_page = NULL;
1442 stp_online = 0;
1443 }
1444}
1445
1446static void stp_timeout(unsigned long dummy)
1447{
1448 queue_work(time_sync_wq, &stp_work);
1449}
1450
1451static int __init stp_init(void)
1452{
1453 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1454 return 0;
1455 setup_timer(&stp_timer, stp_timeout, 0UL);
1456 time_init_wq();
1457 if (!stp_online)
1458 return 0;
1459 queue_work(time_sync_wq, &stp_work);
1460 return 0;
1461}
1462
1463arch_initcall(stp_init);
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473static void stp_timing_alert(struct stp_irq_parm *intparm)
1474{
1475 if (intparm->tsc || intparm->lac || intparm->tcpc)
1476 queue_work(time_sync_wq, &stp_work);
1477}
1478
1479
1480
1481
1482
1483
1484
1485void stp_sync_check(void)
1486{
1487 disable_sync_clock(NULL);
1488 queue_work(time_sync_wq, &stp_work);
1489}
1490
1491
1492
1493
1494
1495
1496
1497void stp_island_check(void)
1498{
1499 disable_sync_clock(NULL);
1500 queue_work(time_sync_wq, &stp_work);
1501}
1502
1503
1504static int stp_sync_clock(void *data)
1505{
1506 static int first;
1507 unsigned long long old_clock, delta;
1508 struct clock_sync_data *stp_sync;
1509 int rc;
1510
1511 stp_sync = data;
1512
1513 if (xchg(&first, 1) == 1) {
1514
1515 clock_sync_cpu(stp_sync);
1516 return 0;
1517 }
1518
1519
1520 while (atomic_read(&stp_sync->cpus) != 0)
1521 cpu_relax();
1522
1523 enable_sync_clock();
1524
1525 rc = 0;
1526 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1527 stp_info.todoff[2] || stp_info.todoff[3] ||
1528 stp_info.tmd != 2) {
1529 old_clock = get_clock();
1530 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1531 if (rc == 0) {
1532 delta = adjust_time(old_clock, get_clock(), 0);
1533 fixup_clock_comparator(delta);
1534 rc = chsc_sstpi(stp_page, &stp_info,
1535 sizeof(struct stp_sstpi));
1536 if (rc == 0 && stp_info.tmd != 2)
1537 rc = -EAGAIN;
1538 }
1539 }
1540 if (rc) {
1541 disable_sync_clock(NULL);
1542 stp_sync->in_sync = -EAGAIN;
1543 } else
1544 stp_sync->in_sync = 1;
1545 xchg(&first, 0);
1546 return 0;
1547}
1548
1549
1550
1551
1552
1553static void stp_work_fn(struct work_struct *work)
1554{
1555 struct clock_sync_data stp_sync;
1556 int rc;
1557
1558
1559 mutex_lock(&stp_work_mutex);
1560
1561 if (!stp_online) {
1562 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1563 del_timer_sync(&stp_timer);
1564 goto out_unlock;
1565 }
1566
1567 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1568 if (rc)
1569 goto out_unlock;
1570
1571 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1572 if (rc || stp_info.c == 0)
1573 goto out_unlock;
1574
1575
1576 if (check_sync_clock())
1577 goto out_unlock;
1578
1579 memset(&stp_sync, 0, sizeof(stp_sync));
1580 get_online_cpus();
1581 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1582 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1583 put_online_cpus();
1584
1585 if (!check_sync_clock())
1586
1587
1588
1589
1590 mod_timer(&stp_timer, jiffies + HZ);
1591
1592out_unlock:
1593 mutex_unlock(&stp_work_mutex);
1594}
1595
1596
1597
1598
1599static struct sysdev_class stp_sysclass = {
1600 .name = "stp",
1601};
1602
1603static ssize_t stp_ctn_id_show(struct sysdev_class *class,
1604 struct sysdev_class_attribute *attr,
1605 char *buf)
1606{
1607 if (!stp_online)
1608 return -ENODATA;
1609 return sprintf(buf, "%016llx\n",
1610 *(unsigned long long *) stp_info.ctnid);
1611}
1612
1613static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1614
1615static ssize_t stp_ctn_type_show(struct sysdev_class *class,
1616 struct sysdev_class_attribute *attr,
1617 char *buf)
1618{
1619 if (!stp_online)
1620 return -ENODATA;
1621 return sprintf(buf, "%i\n", stp_info.ctn);
1622}
1623
1624static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1625
1626static ssize_t stp_dst_offset_show(struct sysdev_class *class,
1627 struct sysdev_class_attribute *attr,
1628 char *buf)
1629{
1630 if (!stp_online || !(stp_info.vbits & 0x2000))
1631 return -ENODATA;
1632 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1633}
1634
1635static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1636
1637static ssize_t stp_leap_seconds_show(struct sysdev_class *class,
1638 struct sysdev_class_attribute *attr,
1639 char *buf)
1640{
1641 if (!stp_online || !(stp_info.vbits & 0x8000))
1642 return -ENODATA;
1643 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1644}
1645
1646static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1647
1648static ssize_t stp_stratum_show(struct sysdev_class *class,
1649 struct sysdev_class_attribute *attr,
1650 char *buf)
1651{
1652 if (!stp_online)
1653 return -ENODATA;
1654 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1655}
1656
1657static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1658
1659static ssize_t stp_time_offset_show(struct sysdev_class *class,
1660 struct sysdev_class_attribute *attr,
1661 char *buf)
1662{
1663 if (!stp_online || !(stp_info.vbits & 0x0800))
1664 return -ENODATA;
1665 return sprintf(buf, "%i\n", (int) stp_info.tto);
1666}
1667
1668static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1669
1670static ssize_t stp_time_zone_offset_show(struct sysdev_class *class,
1671 struct sysdev_class_attribute *attr,
1672 char *buf)
1673{
1674 if (!stp_online || !(stp_info.vbits & 0x4000))
1675 return -ENODATA;
1676 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1677}
1678
1679static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1680 stp_time_zone_offset_show, NULL);
1681
1682static ssize_t stp_timing_mode_show(struct sysdev_class *class,
1683 struct sysdev_class_attribute *attr,
1684 char *buf)
1685{
1686 if (!stp_online)
1687 return -ENODATA;
1688 return sprintf(buf, "%i\n", stp_info.tmd);
1689}
1690
1691static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1692
1693static ssize_t stp_timing_state_show(struct sysdev_class *class,
1694 struct sysdev_class_attribute *attr,
1695 char *buf)
1696{
1697 if (!stp_online)
1698 return -ENODATA;
1699 return sprintf(buf, "%i\n", stp_info.tst);
1700}
1701
1702static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1703
1704static ssize_t stp_online_show(struct sysdev_class *class,
1705 struct sysdev_class_attribute *attr,
1706 char *buf)
1707{
1708 return sprintf(buf, "%i\n", stp_online);
1709}
1710
1711static ssize_t stp_online_store(struct sysdev_class *class,
1712 struct sysdev_class_attribute *attr,
1713 const char *buf, size_t count)
1714{
1715 unsigned int value;
1716
1717 value = simple_strtoul(buf, NULL, 0);
1718 if (value != 0 && value != 1)
1719 return -EINVAL;
1720 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1721 return -EOPNOTSUPP;
1722 mutex_lock(&clock_sync_mutex);
1723 stp_online = value;
1724 if (stp_online)
1725 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1726 else
1727 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1728 queue_work(time_sync_wq, &stp_work);
1729 mutex_unlock(&clock_sync_mutex);
1730 return count;
1731}
1732
1733
1734
1735
1736
1737static struct sysdev_class_attribute attr_stp_online = {
1738 .attr = { .name = "online", .mode = 0600 },
1739 .show = stp_online_show,
1740 .store = stp_online_store,
1741};
1742
1743static struct sysdev_class_attribute *stp_attributes[] = {
1744 &attr_ctn_id,
1745 &attr_ctn_type,
1746 &attr_dst_offset,
1747 &attr_leap_seconds,
1748 &attr_stp_online,
1749 &attr_stratum,
1750 &attr_time_offset,
1751 &attr_time_zone_offset,
1752 &attr_timing_mode,
1753 &attr_timing_state,
1754 NULL
1755};
1756
1757static int __init stp_init_sysfs(void)
1758{
1759 struct sysdev_class_attribute **attr;
1760 int rc;
1761
1762 rc = sysdev_class_register(&stp_sysclass);
1763 if (rc)
1764 goto out;
1765 for (attr = stp_attributes; *attr; attr++) {
1766 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1767 if (rc)
1768 goto out_unreg;
1769 }
1770 return 0;
1771out_unreg:
1772 for (; attr >= stp_attributes; attr--)
1773 sysdev_class_remove_file(&stp_sysclass, *attr);
1774 sysdev_class_unregister(&stp_sysclass);
1775out:
1776 return rc;
1777}
1778
1779device_initcall(stp_init_sysfs);
1780