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15#define KMSG_COMPONENT "time"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/errno.h>
19#include <linux/module.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/param.h>
23#include <linux/string.h>
24#include <linux/mm.h>
25#include <linux/interrupt.h>
26#include <linux/cpu.h>
27#include <linux/stop_machine.h>
28#include <linux/time.h>
29#include <linux/sysdev.h>
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/smp.h>
33#include <linux/types.h>
34#include <linux/profile.h>
35#include <linux/timex.h>
36#include <linux/notifier.h>
37#include <linux/clocksource.h>
38#include <linux/clockchips.h>
39#include <asm/uaccess.h>
40#include <asm/delay.h>
41#include <asm/s390_ext.h>
42#include <asm/div64.h>
43#include <asm/vdso.h>
44#include <asm/irq.h>
45#include <asm/irq_regs.h>
46#include <asm/timer.h>
47#include <asm/etr.h>
48#include <asm/cio.h>
49
50
51#define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
52#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
53
54
55
56
57
58#define CPU_DEVIATION (smp_processor_id() << 12)
59
60#define TICK_SIZE tick
61
62u64 sched_clock_base_cc = -1;
63EXPORT_SYMBOL_GPL(sched_clock_base_cc);
64
65static DEFINE_PER_CPU(struct clock_event_device, comparators);
66
67
68
69
70unsigned long long notrace sched_clock(void)
71{
72 return (get_clock_monotonic() * 125) >> 9;
73}
74
75
76
77
78unsigned long long monotonic_clock(void)
79{
80 return sched_clock();
81}
82EXPORT_SYMBOL(monotonic_clock);
83
84void tod_to_timeval(__u64 todval, struct timespec *xtime)
85{
86 unsigned long long sec;
87
88 sec = todval >> 12;
89 do_div(sec, 1000000);
90 xtime->tv_sec = sec;
91 todval -= (sec * 1000000) << 12;
92 xtime->tv_nsec = ((todval * 1000) >> 12);
93}
94EXPORT_SYMBOL(tod_to_timeval);
95
96void clock_comparator_work(void)
97{
98 struct clock_event_device *cd;
99
100 S390_lowcore.clock_comparator = -1ULL;
101 set_clock_comparator(S390_lowcore.clock_comparator);
102 cd = &__get_cpu_var(comparators);
103 cd->event_handler(cd);
104}
105
106
107
108
109static void fixup_clock_comparator(unsigned long long delta)
110{
111
112 if (S390_lowcore.clock_comparator == -1ULL)
113 return;
114 S390_lowcore.clock_comparator += delta;
115 set_clock_comparator(S390_lowcore.clock_comparator);
116}
117
118static int s390_next_event(unsigned long delta,
119 struct clock_event_device *evt)
120{
121 S390_lowcore.clock_comparator = get_clock() + delta;
122 set_clock_comparator(S390_lowcore.clock_comparator);
123 return 0;
124}
125
126static void s390_set_mode(enum clock_event_mode mode,
127 struct clock_event_device *evt)
128{
129}
130
131
132
133
134
135void init_cpu_timer(void)
136{
137 struct clock_event_device *cd;
138 int cpu;
139
140 S390_lowcore.clock_comparator = -1ULL;
141 set_clock_comparator(S390_lowcore.clock_comparator);
142
143 cpu = smp_processor_id();
144 cd = &per_cpu(comparators, cpu);
145 cd->name = "comparator";
146 cd->features = CLOCK_EVT_FEAT_ONESHOT;
147 cd->mult = 16777;
148 cd->shift = 12;
149 cd->min_delta_ns = 1;
150 cd->max_delta_ns = LONG_MAX;
151 cd->rating = 400;
152 cd->cpumask = cpumask_of(cpu);
153 cd->set_next_event = s390_next_event;
154 cd->set_mode = s390_set_mode;
155
156 clockevents_register_device(cd);
157
158
159 __ctl_set_bit(0,11);
160
161
162 __ctl_set_bit(0, 4);
163}
164
165static void clock_comparator_interrupt(__u16 code)
166{
167 if (S390_lowcore.clock_comparator == -1ULL)
168 set_clock_comparator(S390_lowcore.clock_comparator);
169}
170
171static void etr_timing_alert(struct etr_irq_parm *);
172static void stp_timing_alert(struct stp_irq_parm *);
173
174static void timing_alert_interrupt(__u16 code)
175{
176 if (S390_lowcore.ext_params & 0x00c40000)
177 etr_timing_alert((struct etr_irq_parm *)
178 &S390_lowcore.ext_params);
179 if (S390_lowcore.ext_params & 0x00038000)
180 stp_timing_alert((struct stp_irq_parm *)
181 &S390_lowcore.ext_params);
182}
183
184static void etr_reset(void);
185static void stp_reset(void);
186
187void read_persistent_clock(struct timespec *ts)
188{
189 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
190}
191
192void read_boot_clock(struct timespec *ts)
193{
194 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
195}
196
197static cycle_t read_tod_clock(struct clocksource *cs)
198{
199 return get_clock();
200}
201
202static struct clocksource clocksource_tod = {
203 .name = "tod",
204 .rating = 400,
205 .read = read_tod_clock,
206 .mask = -1ULL,
207 .mult = 1000,
208 .shift = 12,
209 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
210};
211
212struct clocksource * __init clocksource_default_clock(void)
213{
214 return &clocksource_tod;
215}
216
217void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
218{
219 if (clock != &clocksource_tod)
220 return;
221
222
223 ++vdso_data->tb_update_count;
224 smp_wmb();
225 vdso_data->xtime_tod_stamp = clock->cycle_last;
226 vdso_data->xtime_clock_sec = xtime.tv_sec;
227 vdso_data->xtime_clock_nsec = xtime.tv_nsec;
228 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
229 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
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
321
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325
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_sync);
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_sync);
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 stop_machine_create();
400}
401
402
403
404
405static int etr_port0_online;
406static int etr_port1_online;
407static int etr_steai_available;
408
409static int __init early_parse_etr(char *p)
410{
411 if (strncmp(p, "off", 3) == 0)
412 etr_port0_online = etr_port1_online = 0;
413 else if (strncmp(p, "port0", 5) == 0)
414 etr_port0_online = 1;
415 else if (strncmp(p, "port1", 5) == 0)
416 etr_port1_online = 1;
417 else if (strncmp(p, "on", 2) == 0)
418 etr_port0_online = etr_port1_online = 1;
419 return 0;
420}
421early_param("etr", early_parse_etr);
422
423enum etr_event {
424 ETR_EVENT_PORT0_CHANGE,
425 ETR_EVENT_PORT1_CHANGE,
426 ETR_EVENT_PORT_ALERT,
427 ETR_EVENT_SYNC_CHECK,
428 ETR_EVENT_SWITCH_LOCAL,
429 ETR_EVENT_UPDATE,
430};
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455
456static struct etr_eacr etr_eacr;
457static u64 etr_tolec;
458static struct etr_aib etr_port0;
459static int etr_port0_uptodate;
460static struct etr_aib etr_port1;
461static int etr_port1_uptodate;
462static unsigned long etr_events;
463static struct timer_list etr_timer;
464
465static void etr_timeout(unsigned long dummy);
466static void etr_work_fn(struct work_struct *work);
467static DEFINE_MUTEX(etr_work_mutex);
468static DECLARE_WORK(etr_work, etr_work_fn);
469
470
471
472
473static void etr_reset(void)
474{
475 etr_eacr = (struct etr_eacr) {
476 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
477 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
478 .es = 0, .sl = 0 };
479 if (etr_setr(&etr_eacr) == 0) {
480 etr_tolec = get_clock();
481 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
482 if (etr_port0_online && etr_port1_online)
483 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
484 } else if (etr_port0_online || etr_port1_online) {
485 pr_warning("The real or virtual hardware system does "
486 "not provide an ETR interface\n");
487 etr_port0_online = etr_port1_online = 0;
488 }
489}
490
491static int __init etr_init(void)
492{
493 struct etr_aib aib;
494
495 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
496 return 0;
497 time_init_wq();
498
499 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
500 etr_steai_available = 1;
501 setup_timer(&etr_timer, etr_timeout, 0UL);
502 if (etr_port0_online) {
503 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
504 queue_work(time_sync_wq, &etr_work);
505 }
506 if (etr_port1_online) {
507 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
508 queue_work(time_sync_wq, &etr_work);
509 }
510 return 0;
511}
512
513arch_initcall(etr_init);
514
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526
527
528void etr_switch_to_local(void)
529{
530 if (!etr_eacr.sl)
531 return;
532 disable_sync_clock(NULL);
533 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
534 queue_work(time_sync_wq, &etr_work);
535}
536
537
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540
541
542
543void etr_sync_check(void)
544{
545 if (!etr_eacr.es)
546 return;
547 disable_sync_clock(NULL);
548 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
549 queue_work(time_sync_wq, &etr_work);
550}
551
552
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554
555
556
557
558
559static void etr_timing_alert(struct etr_irq_parm *intparm)
560{
561 if (intparm->pc0)
562
563 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
564 if (intparm->pc1)
565
566 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
567 if (intparm->eai)
568
569
570
571
572 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
573 queue_work(time_sync_wq, &etr_work);
574}
575
576static void etr_timeout(unsigned long dummy)
577{
578 set_bit(ETR_EVENT_UPDATE, &etr_events);
579 queue_work(time_sync_wq, &etr_work);
580}
581
582
583
584
585static inline int etr_mode_is_pps(struct etr_eacr eacr)
586{
587 return eacr.es && !eacr.sl;
588}
589
590
591
592
593static inline int etr_mode_is_etr(struct etr_eacr eacr)
594{
595 return eacr.es && eacr.sl;
596}
597
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603
604
605static int etr_port_valid(struct etr_aib *aib, int port)
606{
607 unsigned int psc;
608
609
610 if (aib->tsp == 0)
611 return 0;
612
613 psc = port ? aib->esw.psc1 : aib->esw.psc0;
614 if (psc == etr_lpsc_pps_mode)
615 return 1;
616 if (psc == etr_lpsc_operational_step)
617 return !aib->esw.y && aib->slsw.v1 &&
618 aib->slsw.v2 && aib->slsw.v3;
619 return 0;
620}
621
622
623
624
625static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
626{
627
628 return aib1->edf1.net_id == aib2->edf1.net_id;
629}
630
631
632
633
634
635
636static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
637{
638 BUG_ON(etr_steai(aib, func) != 0);
639
640 if (aib->esw.psc0 == 1)
641 aib->esw.psc0 = 2;
642 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
643 aib->esw.psc0 = 1;
644 if (aib->esw.psc1 == 1)
645 aib->esw.psc1 = 2;
646 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
647 aib->esw.psc1 = 1;
648}
649
650
651
652
653
654static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
655{
656 int state_a1, state_a2;
657
658
659 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
660 a1->esw.eacr.e1 != a2->esw.eacr.e1)
661 return 0;
662
663
664 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
665 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
666 if (state_a1 == etr_lpsc_operational_step) {
667 if (state_a2 != etr_lpsc_operational_step ||
668 a1->edf1.net_id != a2->edf1.net_id ||
669 a1->edf1.etr_id != a2->edf1.etr_id ||
670 a1->edf1.etr_pn != a2->edf1.etr_pn)
671 return 0;
672 } else if (state_a2 != etr_lpsc_pps_mode)
673 return 0;
674
675
676 if (a1->edf2.etv + 1 != a2->edf2.etv)
677 return 0;
678
679 if (!etr_port_valid(a2, p))
680 return 0;
681
682 return 1;
683}
684
685struct clock_sync_data {
686 atomic_t cpus;
687 int in_sync;
688 unsigned long long fixup_cc;
689 int etr_port;
690 struct etr_aib *etr_aib;
691};
692
693static void clock_sync_cpu(struct clock_sync_data *sync)
694{
695 atomic_dec(&sync->cpus);
696 enable_sync_clock();
697
698
699
700
701
702
703 while (sync->in_sync == 0) {
704 __udelay(1);
705
706
707
708
709 barrier();
710 }
711 if (sync->in_sync != 1)
712
713 disable_sync_clock(NULL);
714
715
716
717
718 fixup_clock_comparator(sync->fixup_cc);
719}
720
721
722
723
724
725
726static int etr_sync_clock(void *data)
727{
728 static int first;
729 unsigned long long clock, old_clock, delay, delta;
730 struct clock_sync_data *etr_sync;
731 struct etr_aib *sync_port, *aib;
732 int port;
733 int rc;
734
735 etr_sync = data;
736
737 if (xchg(&first, 1) == 1) {
738
739 clock_sync_cpu(etr_sync);
740 return 0;
741 }
742
743
744 while (atomic_read(&etr_sync->cpus) != 0)
745 cpu_relax();
746
747 port = etr_sync->etr_port;
748 aib = etr_sync->etr_aib;
749 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
750 enable_sync_clock();
751
752
753 __ctl_set_bit(14, 21);
754 __ctl_set_bit(0, 29);
755 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
756 old_clock = get_clock();
757 if (set_clock(clock) == 0) {
758 __udelay(1);
759 __ctl_clear_bit(0, 29);
760 __ctl_clear_bit(14, 21);
761 etr_stetr(aib);
762
763 delay = (unsigned long long)
764 (aib->edf2.etv - sync_port->edf2.etv) << 32;
765 delta = adjust_time(old_clock, clock, delay);
766 etr_sync->fixup_cc = delta;
767 fixup_clock_comparator(delta);
768
769 if (!etr_aib_follows(sync_port, aib, port)) {
770
771 disable_sync_clock(NULL);
772 etr_sync->in_sync = -EAGAIN;
773 rc = -EAGAIN;
774 } else {
775 etr_sync->in_sync = 1;
776 rc = 0;
777 }
778 } else {
779
780 __ctl_clear_bit(0, 29);
781 __ctl_clear_bit(14, 21);
782 disable_sync_clock(NULL);
783 etr_sync->in_sync = -EAGAIN;
784 rc = -EAGAIN;
785 }
786 xchg(&first, 0);
787 return rc;
788}
789
790static int etr_sync_clock_stop(struct etr_aib *aib, int port)
791{
792 struct clock_sync_data etr_sync;
793 struct etr_aib *sync_port;
794 int follows;
795 int rc;
796
797
798 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
799 follows = etr_aib_follows(sync_port, aib, port);
800 memcpy(sync_port, aib, sizeof(*aib));
801 if (!follows)
802 return -EAGAIN;
803 memset(&etr_sync, 0, sizeof(etr_sync));
804 etr_sync.etr_aib = aib;
805 etr_sync.etr_port = port;
806 get_online_cpus();
807 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
808 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
809 put_online_cpus();
810 return rc;
811}
812
813
814
815
816
817static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
818{
819 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
820 eacr.es = 0;
821 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
822 eacr.es = eacr.sl = 0;
823 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
824 etr_port0_uptodate = etr_port1_uptodate = 0;
825
826 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
827 if (eacr.e0)
828
829
830
831
832
833 etr_tolec = get_clock();
834 eacr.p0 = etr_port0_online;
835 if (!eacr.p0)
836 eacr.e0 = 0;
837 etr_port0_uptodate = 0;
838 }
839 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
840 if (eacr.e1)
841
842
843
844
845
846 etr_tolec = get_clock();
847 eacr.p1 = etr_port1_online;
848 if (!eacr.p1)
849 eacr.e1 = 0;
850 etr_port1_uptodate = 0;
851 }
852 clear_bit(ETR_EVENT_UPDATE, &etr_events);
853 return eacr;
854}
855
856
857
858
859
860static void etr_set_tolec_timeout(unsigned long long now)
861{
862 unsigned long micros;
863
864 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
865 (!etr_eacr.p1 || etr_port1_uptodate))
866 return;
867 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
868 micros = (micros > 1600000) ? 0 : 1600000 - micros;
869 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
870}
871
872
873
874
875static void etr_set_sync_timeout(void)
876{
877 mod_timer(&etr_timer, jiffies + HZ/2);
878}
879
880
881
882
883static struct etr_eacr etr_handle_update(struct etr_aib *aib,
884 struct etr_eacr eacr)
885{
886
887 if (!eacr.e0 && !eacr.e1)
888 return eacr;
889
890
891 if (aib->esw.q == 0) {
892
893 if (eacr.p0 && !etr_port0_uptodate) {
894 etr_port0 = *aib;
895 if (etr_port0_online)
896 etr_port0_uptodate = 1;
897 }
898 } else {
899
900 if (eacr.p1 && !etr_port1_uptodate) {
901 etr_port1 = *aib;
902 if (etr_port0_online)
903 etr_port1_uptodate = 1;
904 }
905 }
906
907
908
909
910
911 if (!check_sync_clock())
912 return eacr;
913
914
915
916
917
918
919 if (etr_steai_available) {
920 if (eacr.p0 && !etr_port0_uptodate) {
921 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
922 etr_port0_uptodate = 1;
923 }
924 if (eacr.p1 && !etr_port1_uptodate) {
925 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
926 etr_port1_uptodate = 1;
927 }
928 } else {
929
930
931
932
933 if ((eacr.p0 && !etr_port0_uptodate) ||
934 (eacr.p1 && !etr_port1_uptodate))
935 eacr.dp ^= 1;
936 else
937 eacr.dp = 0;
938 }
939 return eacr;
940}
941
942
943
944
945
946static void etr_update_eacr(struct etr_eacr eacr)
947{
948 int dp_changed;
949
950 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
951
952 return;
953
954
955
956
957 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
958 (etr_eacr.dp ^ eacr.dp) != 0;
959 etr_eacr = eacr;
960 etr_setr(&etr_eacr);
961 if (dp_changed)
962 etr_tolec = get_clock();
963}
964
965
966
967
968
969
970static void etr_work_fn(struct work_struct *work)
971{
972 unsigned long long now;
973 struct etr_eacr eacr;
974 struct etr_aib aib;
975 int sync_port;
976
977
978 mutex_lock(&etr_work_mutex);
979
980
981 eacr = etr_eacr;
982
983
984 eacr = etr_handle_events(eacr);
985
986
987 eacr.ea = eacr.p0 || eacr.p1;
988 if (!eacr.ea) {
989
990 eacr.dp = eacr.es = eacr.sl = 0;
991 on_each_cpu(disable_sync_clock, NULL, 1);
992 del_timer_sync(&etr_timer);
993 etr_update_eacr(eacr);
994 goto out_unlock;
995 }
996
997
998 BUG_ON(etr_stetr(&aib) != 0);
999 etr_port0.esw = etr_port1.esw = aib.esw;
1000 now = get_clock();
1001
1002
1003
1004
1005
1006 if (now >= etr_tolec + (1600000 << 12))
1007 eacr = etr_handle_update(&aib, eacr);
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1023 eacr.sl = 0;
1024 eacr.e0 = 1;
1025 if (!etr_mode_is_pps(etr_eacr))
1026 eacr.es = 0;
1027 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1028 eacr.e1 = 0;
1029
1030 else if (etr_port0_uptodate && etr_port1_uptodate)
1031 eacr.e1 = 1;
1032 sync_port = (etr_port0_uptodate &&
1033 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1034 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1035 eacr.sl = 0;
1036 eacr.e0 = 0;
1037 eacr.e1 = 1;
1038 if (!etr_mode_is_pps(etr_eacr))
1039 eacr.es = 0;
1040 sync_port = (etr_port1_uptodate &&
1041 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1042 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1043 eacr.sl = 1;
1044 eacr.e0 = 1;
1045 if (!etr_mode_is_etr(etr_eacr))
1046 eacr.es = 0;
1047 if (!eacr.es || !eacr.p1 ||
1048 aib.esw.psc1 != etr_lpsc_operational_alt)
1049 eacr.e1 = 0;
1050 else if (etr_port0_uptodate && etr_port1_uptodate &&
1051 etr_compare_network(&etr_port0, &etr_port1))
1052 eacr.e1 = 1;
1053 sync_port = (etr_port0_uptodate &&
1054 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1055 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1056 eacr.sl = 1;
1057 eacr.e0 = 0;
1058 eacr.e1 = 1;
1059 if (!etr_mode_is_etr(etr_eacr))
1060 eacr.es = 0;
1061 sync_port = (etr_port1_uptodate &&
1062 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1063 } else {
1064
1065 eacr.es = eacr.sl = 0;
1066 sync_port = -1;
1067 }
1068
1069
1070
1071
1072
1073 if (check_sync_clock() || sync_port < 0) {
1074 etr_update_eacr(eacr);
1075 etr_set_tolec_timeout(now);
1076 goto out_unlock;
1077 }
1078
1079
1080
1081
1082
1083 eacr.dp = 0;
1084 eacr.es = 1;
1085
1086
1087
1088
1089
1090
1091
1092
1093 etr_update_eacr(eacr);
1094 if (now < etr_tolec + (1600000 << 12) ||
1095 etr_sync_clock_stop(&aib, sync_port) != 0) {
1096
1097 eacr.es = 0;
1098 etr_update_eacr(eacr);
1099 etr_set_sync_timeout();
1100 } else
1101 etr_set_tolec_timeout(now);
1102out_unlock:
1103 mutex_unlock(&etr_work_mutex);
1104}
1105
1106
1107
1108
1109static struct sysdev_class etr_sysclass = {
1110 .name = "etr",
1111};
1112
1113static struct sys_device etr_port0_dev = {
1114 .id = 0,
1115 .cls = &etr_sysclass,
1116};
1117
1118static struct sys_device etr_port1_dev = {
1119 .id = 1,
1120 .cls = &etr_sysclass,
1121};
1122
1123
1124
1125
1126static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf)
1127{
1128 return sprintf(buf, "%i\n", etr_port0.esw.p);
1129}
1130
1131static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1132
1133static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf)
1134{
1135 char *mode_str;
1136
1137 if (etr_mode_is_pps(etr_eacr))
1138 mode_str = "pps";
1139 else if (etr_mode_is_etr(etr_eacr))
1140 mode_str = "etr";
1141 else
1142 mode_str = "local";
1143 return sprintf(buf, "%s\n", mode_str);
1144}
1145
1146static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1147
1148
1149
1150
1151static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1152{
1153 if (dev == &etr_port0_dev)
1154 return etr_port0_online ? &etr_port0 : NULL;
1155 else
1156 return etr_port1_online ? &etr_port1 : NULL;
1157}
1158
1159static ssize_t etr_online_show(struct sys_device *dev,
1160 struct sysdev_attribute *attr,
1161 char *buf)
1162{
1163 unsigned int online;
1164
1165 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1166 return sprintf(buf, "%i\n", online);
1167}
1168
1169static ssize_t etr_online_store(struct sys_device *dev,
1170 struct sysdev_attribute *attr,
1171 const char *buf, size_t count)
1172{
1173 unsigned int value;
1174
1175 value = simple_strtoul(buf, NULL, 0);
1176 if (value != 0 && value != 1)
1177 return -EINVAL;
1178 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1179 return -EOPNOTSUPP;
1180 mutex_lock(&clock_sync_mutex);
1181 if (dev == &etr_port0_dev) {
1182 if (etr_port0_online == value)
1183 goto out;
1184 etr_port0_online = value;
1185 if (etr_port0_online && etr_port1_online)
1186 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1187 else
1188 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1189 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1190 queue_work(time_sync_wq, &etr_work);
1191 } else {
1192 if (etr_port1_online == value)
1193 goto out;
1194 etr_port1_online = value;
1195 if (etr_port0_online && etr_port1_online)
1196 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1197 else
1198 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1199 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1200 queue_work(time_sync_wq, &etr_work);
1201 }
1202out:
1203 mutex_unlock(&clock_sync_mutex);
1204 return count;
1205}
1206
1207static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1208
1209static ssize_t etr_stepping_control_show(struct sys_device *dev,
1210 struct sysdev_attribute *attr,
1211 char *buf)
1212{
1213 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1214 etr_eacr.e0 : etr_eacr.e1);
1215}
1216
1217static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1218
1219static ssize_t etr_mode_code_show(struct sys_device *dev,
1220 struct sysdev_attribute *attr, char *buf)
1221{
1222 if (!etr_port0_online && !etr_port1_online)
1223
1224 return -ENODATA;
1225 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1226 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1227}
1228
1229static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1230
1231static ssize_t etr_untuned_show(struct sys_device *dev,
1232 struct sysdev_attribute *attr, char *buf)
1233{
1234 struct etr_aib *aib = etr_aib_from_dev(dev);
1235
1236 if (!aib || !aib->slsw.v1)
1237 return -ENODATA;
1238 return sprintf(buf, "%i\n", aib->edf1.u);
1239}
1240
1241static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1242
1243static ssize_t etr_network_id_show(struct sys_device *dev,
1244 struct sysdev_attribute *attr, char *buf)
1245{
1246 struct etr_aib *aib = etr_aib_from_dev(dev);
1247
1248 if (!aib || !aib->slsw.v1)
1249 return -ENODATA;
1250 return sprintf(buf, "%i\n", aib->edf1.net_id);
1251}
1252
1253static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1254
1255static ssize_t etr_id_show(struct sys_device *dev,
1256 struct sysdev_attribute *attr, char *buf)
1257{
1258 struct etr_aib *aib = etr_aib_from_dev(dev);
1259
1260 if (!aib || !aib->slsw.v1)
1261 return -ENODATA;
1262 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1263}
1264
1265static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1266
1267static ssize_t etr_port_number_show(struct sys_device *dev,
1268 struct sysdev_attribute *attr, char *buf)
1269{
1270 struct etr_aib *aib = etr_aib_from_dev(dev);
1271
1272 if (!aib || !aib->slsw.v1)
1273 return -ENODATA;
1274 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1275}
1276
1277static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1278
1279static ssize_t etr_coupled_show(struct sys_device *dev,
1280 struct sysdev_attribute *attr, char *buf)
1281{
1282 struct etr_aib *aib = etr_aib_from_dev(dev);
1283
1284 if (!aib || !aib->slsw.v3)
1285 return -ENODATA;
1286 return sprintf(buf, "%i\n", aib->edf3.c);
1287}
1288
1289static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1290
1291static ssize_t etr_local_time_show(struct sys_device *dev,
1292 struct sysdev_attribute *attr, char *buf)
1293{
1294 struct etr_aib *aib = etr_aib_from_dev(dev);
1295
1296 if (!aib || !aib->slsw.v3)
1297 return -ENODATA;
1298 return sprintf(buf, "%i\n", aib->edf3.blto);
1299}
1300
1301static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1302
1303static ssize_t etr_utc_offset_show(struct sys_device *dev,
1304 struct sysdev_attribute *attr, char *buf)
1305{
1306 struct etr_aib *aib = etr_aib_from_dev(dev);
1307
1308 if (!aib || !aib->slsw.v3)
1309 return -ENODATA;
1310 return sprintf(buf, "%i\n", aib->edf3.buo);
1311}
1312
1313static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1314
1315static struct sysdev_attribute *etr_port_attributes[] = {
1316 &attr_online,
1317 &attr_stepping_control,
1318 &attr_state_code,
1319 &attr_untuned,
1320 &attr_network,
1321 &attr_id,
1322 &attr_port,
1323 &attr_coupled,
1324 &attr_local_time,
1325 &attr_utc_offset,
1326 NULL
1327};
1328
1329static int __init etr_register_port(struct sys_device *dev)
1330{
1331 struct sysdev_attribute **attr;
1332 int rc;
1333
1334 rc = sysdev_register(dev);
1335 if (rc)
1336 goto out;
1337 for (attr = etr_port_attributes; *attr; attr++) {
1338 rc = sysdev_create_file(dev, *attr);
1339 if (rc)
1340 goto out_unreg;
1341 }
1342 return 0;
1343out_unreg:
1344 for (; attr >= etr_port_attributes; attr--)
1345 sysdev_remove_file(dev, *attr);
1346 sysdev_unregister(dev);
1347out:
1348 return rc;
1349}
1350
1351static void __init etr_unregister_port(struct sys_device *dev)
1352{
1353 struct sysdev_attribute **attr;
1354
1355 for (attr = etr_port_attributes; *attr; attr++)
1356 sysdev_remove_file(dev, *attr);
1357 sysdev_unregister(dev);
1358}
1359
1360static int __init etr_init_sysfs(void)
1361{
1362 int rc;
1363
1364 rc = sysdev_class_register(&etr_sysclass);
1365 if (rc)
1366 goto out;
1367 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1368 if (rc)
1369 goto out_unreg_class;
1370 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1371 if (rc)
1372 goto out_remove_stepping_port;
1373 rc = etr_register_port(&etr_port0_dev);
1374 if (rc)
1375 goto out_remove_stepping_mode;
1376 rc = etr_register_port(&etr_port1_dev);
1377 if (rc)
1378 goto out_remove_port0;
1379 return 0;
1380
1381out_remove_port0:
1382 etr_unregister_port(&etr_port0_dev);
1383out_remove_stepping_mode:
1384 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1385out_remove_stepping_port:
1386 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1387out_unreg_class:
1388 sysdev_class_unregister(&etr_sysclass);
1389out:
1390 return rc;
1391}
1392
1393device_initcall(etr_init_sysfs);
1394
1395
1396
1397
1398static int stp_online;
1399static struct stp_sstpi stp_info;
1400static void *stp_page;
1401
1402static void stp_work_fn(struct work_struct *work);
1403static DEFINE_MUTEX(stp_work_mutex);
1404static DECLARE_WORK(stp_work, stp_work_fn);
1405static struct timer_list stp_timer;
1406
1407static int __init early_parse_stp(char *p)
1408{
1409 if (strncmp(p, "off", 3) == 0)
1410 stp_online = 0;
1411 else if (strncmp(p, "on", 2) == 0)
1412 stp_online = 1;
1413 return 0;
1414}
1415early_param("stp", early_parse_stp);
1416
1417
1418
1419
1420static void __init stp_reset(void)
1421{
1422 int rc;
1423
1424 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1425 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1426 if (rc == 0)
1427 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1428 else if (stp_online) {
1429 pr_warning("The real or virtual hardware system does "
1430 "not provide an STP interface\n");
1431 free_page((unsigned long) stp_page);
1432 stp_page = NULL;
1433 stp_online = 0;
1434 }
1435}
1436
1437static void stp_timeout(unsigned long dummy)
1438{
1439 queue_work(time_sync_wq, &stp_work);
1440}
1441
1442static int __init stp_init(void)
1443{
1444 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1445 return 0;
1446 setup_timer(&stp_timer, stp_timeout, 0UL);
1447 time_init_wq();
1448 if (!stp_online)
1449 return 0;
1450 queue_work(time_sync_wq, &stp_work);
1451 return 0;
1452}
1453
1454arch_initcall(stp_init);
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464static void stp_timing_alert(struct stp_irq_parm *intparm)
1465{
1466 if (intparm->tsc || intparm->lac || intparm->tcpc)
1467 queue_work(time_sync_wq, &stp_work);
1468}
1469
1470
1471
1472
1473
1474
1475
1476void stp_sync_check(void)
1477{
1478 disable_sync_clock(NULL);
1479 queue_work(time_sync_wq, &stp_work);
1480}
1481
1482
1483
1484
1485
1486
1487
1488void stp_island_check(void)
1489{
1490 disable_sync_clock(NULL);
1491 queue_work(time_sync_wq, &stp_work);
1492}
1493
1494
1495static int stp_sync_clock(void *data)
1496{
1497 static int first;
1498 unsigned long long old_clock, delta;
1499 struct clock_sync_data *stp_sync;
1500 int rc;
1501
1502 stp_sync = data;
1503
1504 if (xchg(&first, 1) == 1) {
1505
1506 clock_sync_cpu(stp_sync);
1507 return 0;
1508 }
1509
1510
1511 while (atomic_read(&stp_sync->cpus) != 0)
1512 cpu_relax();
1513
1514 enable_sync_clock();
1515
1516 rc = 0;
1517 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1518 stp_info.todoff[2] || stp_info.todoff[3] ||
1519 stp_info.tmd != 2) {
1520 old_clock = get_clock();
1521 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1522 if (rc == 0) {
1523 delta = adjust_time(old_clock, get_clock(), 0);
1524 fixup_clock_comparator(delta);
1525 rc = chsc_sstpi(stp_page, &stp_info,
1526 sizeof(struct stp_sstpi));
1527 if (rc == 0 && stp_info.tmd != 2)
1528 rc = -EAGAIN;
1529 }
1530 }
1531 if (rc) {
1532 disable_sync_clock(NULL);
1533 stp_sync->in_sync = -EAGAIN;
1534 } else
1535 stp_sync->in_sync = 1;
1536 xchg(&first, 0);
1537 return 0;
1538}
1539
1540
1541
1542
1543
1544static void stp_work_fn(struct work_struct *work)
1545{
1546 struct clock_sync_data stp_sync;
1547 int rc;
1548
1549
1550 mutex_lock(&stp_work_mutex);
1551
1552 if (!stp_online) {
1553 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1554 del_timer_sync(&stp_timer);
1555 goto out_unlock;
1556 }
1557
1558 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1559 if (rc)
1560 goto out_unlock;
1561
1562 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1563 if (rc || stp_info.c == 0)
1564 goto out_unlock;
1565
1566
1567 if (check_sync_clock())
1568 goto out_unlock;
1569
1570 memset(&stp_sync, 0, sizeof(stp_sync));
1571 get_online_cpus();
1572 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1573 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1574 put_online_cpus();
1575
1576 if (!check_sync_clock())
1577
1578
1579
1580
1581 mod_timer(&stp_timer, jiffies + HZ);
1582
1583out_unlock:
1584 mutex_unlock(&stp_work_mutex);
1585}
1586
1587
1588
1589
1590static struct sysdev_class stp_sysclass = {
1591 .name = "stp",
1592};
1593
1594static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf)
1595{
1596 if (!stp_online)
1597 return -ENODATA;
1598 return sprintf(buf, "%016llx\n",
1599 *(unsigned long long *) stp_info.ctnid);
1600}
1601
1602static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1603
1604static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf)
1605{
1606 if (!stp_online)
1607 return -ENODATA;
1608 return sprintf(buf, "%i\n", stp_info.ctn);
1609}
1610
1611static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1612
1613static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf)
1614{
1615 if (!stp_online || !(stp_info.vbits & 0x2000))
1616 return -ENODATA;
1617 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1618}
1619
1620static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1621
1622static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf)
1623{
1624 if (!stp_online || !(stp_info.vbits & 0x8000))
1625 return -ENODATA;
1626 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1627}
1628
1629static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1630
1631static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf)
1632{
1633 if (!stp_online)
1634 return -ENODATA;
1635 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1636}
1637
1638static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1639
1640static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf)
1641{
1642 if (!stp_online || !(stp_info.vbits & 0x0800))
1643 return -ENODATA;
1644 return sprintf(buf, "%i\n", (int) stp_info.tto);
1645}
1646
1647static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1648
1649static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, char *buf)
1650{
1651 if (!stp_online || !(stp_info.vbits & 0x4000))
1652 return -ENODATA;
1653 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1654}
1655
1656static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1657 stp_time_zone_offset_show, NULL);
1658
1659static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf)
1660{
1661 if (!stp_online)
1662 return -ENODATA;
1663 return sprintf(buf, "%i\n", stp_info.tmd);
1664}
1665
1666static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1667
1668static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf)
1669{
1670 if (!stp_online)
1671 return -ENODATA;
1672 return sprintf(buf, "%i\n", stp_info.tst);
1673}
1674
1675static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1676
1677static ssize_t stp_online_show(struct sysdev_class *class, char *buf)
1678{
1679 return sprintf(buf, "%i\n", stp_online);
1680}
1681
1682static ssize_t stp_online_store(struct sysdev_class *class,
1683 const char *buf, size_t count)
1684{
1685 unsigned int value;
1686
1687 value = simple_strtoul(buf, NULL, 0);
1688 if (value != 0 && value != 1)
1689 return -EINVAL;
1690 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1691 return -EOPNOTSUPP;
1692 mutex_lock(&clock_sync_mutex);
1693 stp_online = value;
1694 if (stp_online)
1695 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1696 else
1697 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1698 queue_work(time_sync_wq, &stp_work);
1699 mutex_unlock(&clock_sync_mutex);
1700 return count;
1701}
1702
1703
1704
1705
1706
1707static struct sysdev_class_attribute attr_stp_online = {
1708 .attr = { .name = "online", .mode = 0600 },
1709 .show = stp_online_show,
1710 .store = stp_online_store,
1711};
1712
1713static struct sysdev_class_attribute *stp_attributes[] = {
1714 &attr_ctn_id,
1715 &attr_ctn_type,
1716 &attr_dst_offset,
1717 &attr_leap_seconds,
1718 &attr_stp_online,
1719 &attr_stratum,
1720 &attr_time_offset,
1721 &attr_time_zone_offset,
1722 &attr_timing_mode,
1723 &attr_timing_state,
1724 NULL
1725};
1726
1727static int __init stp_init_sysfs(void)
1728{
1729 struct sysdev_class_attribute **attr;
1730 int rc;
1731
1732 rc = sysdev_class_register(&stp_sysclass);
1733 if (rc)
1734 goto out;
1735 for (attr = stp_attributes; *attr; attr++) {
1736 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1737 if (rc)
1738 goto out_unreg;
1739 }
1740 return 0;
1741out_unreg:
1742 for (; attr >= stp_attributes; attr--)
1743 sysdev_class_remove_file(&stp_sysclass, *attr);
1744 sysdev_class_unregister(&stp_sysclass);
1745out:
1746 return rc;
1747}
1748
1749device_initcall(stp_init_sysfs);
1750