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14#define KMSG_COMPONENT "time"
15#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16
17#include <linux/kernel_stat.h>
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/device.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 <linux/gfp.h>
40#include <linux/kprobes.h>
41#include <asm/uaccess.h>
42#include <asm/delay.h>
43#include <asm/div64.h>
44#include <asm/vdso.h>
45#include <asm/irq.h>
46#include <asm/irq_regs.h>
47#include <asm/vtimer.h>
48#include <asm/etr.h>
49#include <asm/cio.h>
50#include "entry.h"
51
52
53#define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
54#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
55
56u64 sched_clock_base_cc = -1;
57EXPORT_SYMBOL_GPL(sched_clock_base_cc);
58
59static DEFINE_PER_CPU(struct clock_event_device, comparators);
60
61
62
63
64unsigned long long notrace __kprobes sched_clock(void)
65{
66 return (get_clock_monotonic() * 125) >> 9;
67}
68
69
70
71
72unsigned long long monotonic_clock(void)
73{
74 return sched_clock();
75}
76EXPORT_SYMBOL(monotonic_clock);
77
78void tod_to_timeval(__u64 todval, struct timespec *xt)
79{
80 unsigned long long sec;
81
82 sec = todval >> 12;
83 do_div(sec, 1000000);
84 xt->tv_sec = sec;
85 todval -= (sec * 1000000) << 12;
86 xt->tv_nsec = ((todval * 1000) >> 12);
87}
88EXPORT_SYMBOL(tod_to_timeval);
89
90void clock_comparator_work(void)
91{
92 struct clock_event_device *cd;
93
94 S390_lowcore.clock_comparator = -1ULL;
95 set_clock_comparator(S390_lowcore.clock_comparator);
96 cd = &__get_cpu_var(comparators);
97 cd->event_handler(cd);
98}
99
100
101
102
103static void fixup_clock_comparator(unsigned long long delta)
104{
105
106 if (S390_lowcore.clock_comparator == -1ULL)
107 return;
108 S390_lowcore.clock_comparator += delta;
109 set_clock_comparator(S390_lowcore.clock_comparator);
110}
111
112static int s390_next_ktime(ktime_t expires,
113 struct clock_event_device *evt)
114{
115 struct timespec ts;
116 u64 nsecs;
117
118 ts.tv_sec = ts.tv_nsec = 0;
119 monotonic_to_bootbased(&ts);
120 nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
121 do_div(nsecs, 125);
122 S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
123 set_clock_comparator(S390_lowcore.clock_comparator);
124 return 0;
125}
126
127static void s390_set_mode(enum clock_event_mode mode,
128 struct clock_event_device *evt)
129{
130}
131
132
133
134
135
136void init_cpu_timer(void)
137{
138 struct clock_event_device *cd;
139 int cpu;
140
141 S390_lowcore.clock_comparator = -1ULL;
142 set_clock_comparator(S390_lowcore.clock_comparator);
143
144 cpu = smp_processor_id();
145 cd = &per_cpu(comparators, cpu);
146 cd->name = "comparator";
147 cd->features = CLOCK_EVT_FEAT_ONESHOT |
148 CLOCK_EVT_FEAT_KTIME;
149 cd->mult = 16777;
150 cd->shift = 12;
151 cd->min_delta_ns = 1;
152 cd->max_delta_ns = LONG_MAX;
153 cd->rating = 400;
154 cd->cpumask = cpumask_of(cpu);
155 cd->set_next_ktime = s390_next_ktime;
156 cd->set_mode = s390_set_mode;
157
158 clockevents_register_device(cd);
159
160
161 __ctl_set_bit(0,11);
162
163
164 __ctl_set_bit(0, 4);
165}
166
167static void clock_comparator_interrupt(struct ext_code ext_code,
168 unsigned int param32,
169 unsigned long param64)
170{
171 kstat_cpu(smp_processor_id()).irqs[EXTINT_CLK]++;
172 if (S390_lowcore.clock_comparator == -1ULL)
173 set_clock_comparator(S390_lowcore.clock_comparator);
174}
175
176static void etr_timing_alert(struct etr_irq_parm *);
177static void stp_timing_alert(struct stp_irq_parm *);
178
179static void timing_alert_interrupt(struct ext_code ext_code,
180 unsigned int param32, unsigned long param64)
181{
182 kstat_cpu(smp_processor_id()).irqs[EXTINT_TLA]++;
183 if (param32 & 0x00c40000)
184 etr_timing_alert((struct etr_irq_parm *) ¶m32);
185 if (param32 & 0x00038000)
186 stp_timing_alert((struct stp_irq_parm *) ¶m32);
187}
188
189static void etr_reset(void);
190static void stp_reset(void);
191
192void read_persistent_clock(struct timespec *ts)
193{
194 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
195}
196
197void read_boot_clock(struct timespec *ts)
198{
199 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
200}
201
202static cycle_t read_tod_clock(struct clocksource *cs)
203{
204 return get_clock();
205}
206
207static struct clocksource clocksource_tod = {
208 .name = "tod",
209 .rating = 400,
210 .read = read_tod_clock,
211 .mask = -1ULL,
212 .mult = 1000,
213 .shift = 12,
214 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
215};
216
217struct clocksource * __init clocksource_default_clock(void)
218{
219 return &clocksource_tod;
220}
221
222void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
223 struct clocksource *clock, u32 mult)
224{
225 if (clock != &clocksource_tod)
226 return;
227
228
229 ++vdso_data->tb_update_count;
230 smp_wmb();
231 vdso_data->xtime_tod_stamp = clock->cycle_last;
232 vdso_data->xtime_clock_sec = wall_time->tv_sec;
233 vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
234 vdso_data->wtom_clock_sec = wtm->tv_sec;
235 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
236 vdso_data->ntp_mult = mult;
237 smp_wmb();
238 ++vdso_data->tb_update_count;
239}
240
241extern struct timezone sys_tz;
242
243void update_vsyscall_tz(void)
244{
245
246 ++vdso_data->tb_update_count;
247 smp_wmb();
248 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
249 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
250 smp_wmb();
251 ++vdso_data->tb_update_count;
252}
253
254
255
256
257
258void __init time_init(void)
259{
260
261 etr_reset();
262 stp_reset();
263
264
265 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
266 panic("Couldn't request external interrupt 0x1004");
267
268
269 if (register_external_interrupt(0x1406, timing_alert_interrupt))
270 panic("Couldn't request external interrupt 0x1406");
271
272 if (clocksource_register(&clocksource_tod) != 0)
273 panic("Could not register TOD clock source");
274
275
276 init_cpu_timer();
277
278
279 vtime_init();
280}
281
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286
287
288
289static unsigned long long adjust_time(unsigned long long old,
290 unsigned long long clock,
291 unsigned long long delay)
292{
293 unsigned long long delta, ticks;
294 struct timex adjust;
295
296 if (clock > old) {
297
298 delta = ticks = clock - old;
299 delta = ticks = (delta < delay) ? 0 : delta - delay;
300 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
301 adjust.offset = ticks * (1000000 / HZ);
302 } else {
303
304 delta = ticks = old - clock;
305 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
306 delta = -delta;
307 adjust.offset = -ticks * (1000000 / HZ);
308 }
309 sched_clock_base_cc += delta;
310 if (adjust.offset != 0) {
311 pr_notice("The ETR interface has adjusted the clock "
312 "by %li microseconds\n", adjust.offset);
313 adjust.modes = ADJ_OFFSET_SINGLESHOT;
314 do_adjtimex(&adjust);
315 }
316 return delta;
317}
318
319static DEFINE_PER_CPU(atomic_t, clock_sync_word);
320static DEFINE_MUTEX(clock_sync_mutex);
321static unsigned long clock_sync_flags;
322
323#define CLOCK_SYNC_HAS_ETR 0
324#define CLOCK_SYNC_HAS_STP 1
325#define CLOCK_SYNC_ETR 2
326#define CLOCK_SYNC_STP 3
327
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333
334
335int get_sync_clock(unsigned long long *clock)
336{
337 atomic_t *sw_ptr;
338 unsigned int sw0, sw1;
339
340 sw_ptr = &get_cpu_var(clock_sync_word);
341 sw0 = atomic_read(sw_ptr);
342 *clock = get_clock();
343 sw1 = atomic_read(sw_ptr);
344 put_cpu_var(clock_sync_word);
345 if (sw0 == sw1 && (sw0 & 0x80000000U))
346
347 return 0;
348 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
349 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
350 return -ENOSYS;
351 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
352 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
353 return -EACCES;
354 return -EAGAIN;
355}
356EXPORT_SYMBOL(get_sync_clock);
357
358
359
360
361static void disable_sync_clock(void *dummy)
362{
363 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
364
365
366
367
368
369
370 atomic_clear_mask(0x80000000, sw_ptr);
371 atomic_inc(sw_ptr);
372}
373
374
375
376
377
378static void enable_sync_clock(void)
379{
380 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
381 atomic_set_mask(0x80000000, sw_ptr);
382}
383
384
385
386
387static inline int check_sync_clock(void)
388{
389 atomic_t *sw_ptr;
390 int rc;
391
392 sw_ptr = &get_cpu_var(clock_sync_word);
393 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
394 put_cpu_var(clock_sync_word);
395 return rc;
396}
397
398
399static struct workqueue_struct *time_sync_wq;
400
401static void __init time_init_wq(void)
402{
403 if (time_sync_wq)
404 return;
405 time_sync_wq = create_singlethread_workqueue("timesync");
406}
407
408
409
410
411static int etr_port0_online;
412static int etr_port1_online;
413static int etr_steai_available;
414
415static int __init early_parse_etr(char *p)
416{
417 if (strncmp(p, "off", 3) == 0)
418 etr_port0_online = etr_port1_online = 0;
419 else if (strncmp(p, "port0", 5) == 0)
420 etr_port0_online = 1;
421 else if (strncmp(p, "port1", 5) == 0)
422 etr_port1_online = 1;
423 else if (strncmp(p, "on", 2) == 0)
424 etr_port0_online = etr_port1_online = 1;
425 return 0;
426}
427early_param("etr", early_parse_etr);
428
429enum etr_event {
430 ETR_EVENT_PORT0_CHANGE,
431 ETR_EVENT_PORT1_CHANGE,
432 ETR_EVENT_PORT_ALERT,
433 ETR_EVENT_SYNC_CHECK,
434 ETR_EVENT_SWITCH_LOCAL,
435 ETR_EVENT_UPDATE,
436};
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461
462static struct etr_eacr etr_eacr;
463static u64 etr_tolec;
464static struct etr_aib etr_port0;
465static int etr_port0_uptodate;
466static struct etr_aib etr_port1;
467static int etr_port1_uptodate;
468static unsigned long etr_events;
469static struct timer_list etr_timer;
470
471static void etr_timeout(unsigned long dummy);
472static void etr_work_fn(struct work_struct *work);
473static DEFINE_MUTEX(etr_work_mutex);
474static DECLARE_WORK(etr_work, etr_work_fn);
475
476
477
478
479static void etr_reset(void)
480{
481 etr_eacr = (struct etr_eacr) {
482 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
483 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
484 .es = 0, .sl = 0 };
485 if (etr_setr(&etr_eacr) == 0) {
486 etr_tolec = get_clock();
487 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
488 if (etr_port0_online && etr_port1_online)
489 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
490 } else if (etr_port0_online || etr_port1_online) {
491 pr_warning("The real or virtual hardware system does "
492 "not provide an ETR interface\n");
493 etr_port0_online = etr_port1_online = 0;
494 }
495}
496
497static int __init etr_init(void)
498{
499 struct etr_aib aib;
500
501 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
502 return 0;
503 time_init_wq();
504
505 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
506 etr_steai_available = 1;
507 setup_timer(&etr_timer, etr_timeout, 0UL);
508 if (etr_port0_online) {
509 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
510 queue_work(time_sync_wq, &etr_work);
511 }
512 if (etr_port1_online) {
513 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
514 queue_work(time_sync_wq, &etr_work);
515 }
516 return 0;
517}
518
519arch_initcall(etr_init);
520
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531
532
533
534void etr_switch_to_local(void)
535{
536 if (!etr_eacr.sl)
537 return;
538 disable_sync_clock(NULL);
539 if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) {
540 etr_eacr.es = etr_eacr.sl = 0;
541 etr_setr(&etr_eacr);
542 queue_work(time_sync_wq, &etr_work);
543 }
544}
545
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549
550
551
552void etr_sync_check(void)
553{
554 if (!etr_eacr.es)
555 return;
556 disable_sync_clock(NULL);
557 if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) {
558 etr_eacr.es = 0;
559 etr_setr(&etr_eacr);
560 queue_work(time_sync_wq, &etr_work);
561 }
562}
563
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569
570
571static void etr_timing_alert(struct etr_irq_parm *intparm)
572{
573 if (intparm->pc0)
574
575 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
576 if (intparm->pc1)
577
578 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
579 if (intparm->eai)
580
581
582
583
584 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
585 queue_work(time_sync_wq, &etr_work);
586}
587
588static void etr_timeout(unsigned long dummy)
589{
590 set_bit(ETR_EVENT_UPDATE, &etr_events);
591 queue_work(time_sync_wq, &etr_work);
592}
593
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597static inline int etr_mode_is_pps(struct etr_eacr eacr)
598{
599 return eacr.es && !eacr.sl;
600}
601
602
603
604
605static inline int etr_mode_is_etr(struct etr_eacr eacr)
606{
607 return eacr.es && eacr.sl;
608}
609
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613
614
615
616
617static int etr_port_valid(struct etr_aib *aib, int port)
618{
619 unsigned int psc;
620
621
622 if (aib->tsp == 0)
623 return 0;
624
625 psc = port ? aib->esw.psc1 : aib->esw.psc0;
626 if (psc == etr_lpsc_pps_mode)
627 return 1;
628 if (psc == etr_lpsc_operational_step)
629 return !aib->esw.y && aib->slsw.v1 &&
630 aib->slsw.v2 && aib->slsw.v3;
631 return 0;
632}
633
634
635
636
637static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
638{
639
640 return aib1->edf1.net_id == aib2->edf1.net_id;
641}
642
643
644
645
646
647
648static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
649{
650 BUG_ON(etr_steai(aib, func) != 0);
651
652 if (aib->esw.psc0 == 1)
653 aib->esw.psc0 = 2;
654 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
655 aib->esw.psc0 = 1;
656 if (aib->esw.psc1 == 1)
657 aib->esw.psc1 = 2;
658 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
659 aib->esw.psc1 = 1;
660}
661
662
663
664
665
666static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
667{
668 int state_a1, state_a2;
669
670
671 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
672 a1->esw.eacr.e1 != a2->esw.eacr.e1)
673 return 0;
674
675
676 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
677 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
678 if (state_a1 == etr_lpsc_operational_step) {
679 if (state_a2 != etr_lpsc_operational_step ||
680 a1->edf1.net_id != a2->edf1.net_id ||
681 a1->edf1.etr_id != a2->edf1.etr_id ||
682 a1->edf1.etr_pn != a2->edf1.etr_pn)
683 return 0;
684 } else if (state_a2 != etr_lpsc_pps_mode)
685 return 0;
686
687
688 if (a1->edf2.etv + 1 != a2->edf2.etv)
689 return 0;
690
691 if (!etr_port_valid(a2, p))
692 return 0;
693
694 return 1;
695}
696
697struct clock_sync_data {
698 atomic_t cpus;
699 int in_sync;
700 unsigned long long fixup_cc;
701 int etr_port;
702 struct etr_aib *etr_aib;
703};
704
705static void clock_sync_cpu(struct clock_sync_data *sync)
706{
707 atomic_dec(&sync->cpus);
708 enable_sync_clock();
709
710
711
712
713
714
715 while (sync->in_sync == 0) {
716 __udelay(1);
717
718
719
720
721 barrier();
722 }
723 if (sync->in_sync != 1)
724
725 disable_sync_clock(NULL);
726
727
728
729
730 fixup_clock_comparator(sync->fixup_cc);
731}
732
733
734
735
736
737
738static int etr_sync_clock(void *data)
739{
740 static int first;
741 unsigned long long clock, old_clock, delay, delta;
742 struct clock_sync_data *etr_sync;
743 struct etr_aib *sync_port, *aib;
744 int port;
745 int rc;
746
747 etr_sync = data;
748
749 if (xchg(&first, 1) == 1) {
750
751 clock_sync_cpu(etr_sync);
752 return 0;
753 }
754
755
756 while (atomic_read(&etr_sync->cpus) != 0)
757 cpu_relax();
758
759 port = etr_sync->etr_port;
760 aib = etr_sync->etr_aib;
761 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
762 enable_sync_clock();
763
764
765 __ctl_set_bit(14, 21);
766 __ctl_set_bit(0, 29);
767 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
768 old_clock = get_clock();
769 if (set_clock(clock) == 0) {
770 __udelay(1);
771 __ctl_clear_bit(0, 29);
772 __ctl_clear_bit(14, 21);
773 etr_stetr(aib);
774
775 delay = (unsigned long long)
776 (aib->edf2.etv - sync_port->edf2.etv) << 32;
777 delta = adjust_time(old_clock, clock, delay);
778 etr_sync->fixup_cc = delta;
779 fixup_clock_comparator(delta);
780
781 if (!etr_aib_follows(sync_port, aib, port)) {
782
783 disable_sync_clock(NULL);
784 etr_sync->in_sync = -EAGAIN;
785 rc = -EAGAIN;
786 } else {
787 etr_sync->in_sync = 1;
788 rc = 0;
789 }
790 } else {
791
792 __ctl_clear_bit(0, 29);
793 __ctl_clear_bit(14, 21);
794 disable_sync_clock(NULL);
795 etr_sync->in_sync = -EAGAIN;
796 rc = -EAGAIN;
797 }
798 xchg(&first, 0);
799 return rc;
800}
801
802static int etr_sync_clock_stop(struct etr_aib *aib, int port)
803{
804 struct clock_sync_data etr_sync;
805 struct etr_aib *sync_port;
806 int follows;
807 int rc;
808
809
810 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
811 follows = etr_aib_follows(sync_port, aib, port);
812 memcpy(sync_port, aib, sizeof(*aib));
813 if (!follows)
814 return -EAGAIN;
815 memset(&etr_sync, 0, sizeof(etr_sync));
816 etr_sync.etr_aib = aib;
817 etr_sync.etr_port = port;
818 get_online_cpus();
819 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
820 rc = stop_machine(etr_sync_clock, &etr_sync, cpu_online_mask);
821 put_online_cpus();
822 return rc;
823}
824
825
826
827
828
829static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
830{
831 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
832 eacr.es = 0;
833 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
834 eacr.es = eacr.sl = 0;
835 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
836 etr_port0_uptodate = etr_port1_uptodate = 0;
837
838 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
839 if (eacr.e0)
840
841
842
843
844
845 etr_tolec = get_clock();
846 eacr.p0 = etr_port0_online;
847 if (!eacr.p0)
848 eacr.e0 = 0;
849 etr_port0_uptodate = 0;
850 }
851 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
852 if (eacr.e1)
853
854
855
856
857
858 etr_tolec = get_clock();
859 eacr.p1 = etr_port1_online;
860 if (!eacr.p1)
861 eacr.e1 = 0;
862 etr_port1_uptodate = 0;
863 }
864 clear_bit(ETR_EVENT_UPDATE, &etr_events);
865 return eacr;
866}
867
868
869
870
871
872static void etr_set_tolec_timeout(unsigned long long now)
873{
874 unsigned long micros;
875
876 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
877 (!etr_eacr.p1 || etr_port1_uptodate))
878 return;
879 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
880 micros = (micros > 1600000) ? 0 : 1600000 - micros;
881 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
882}
883
884
885
886
887static void etr_set_sync_timeout(void)
888{
889 mod_timer(&etr_timer, jiffies + HZ/2);
890}
891
892
893
894
895static struct etr_eacr etr_handle_update(struct etr_aib *aib,
896 struct etr_eacr eacr)
897{
898
899 if (!eacr.e0 && !eacr.e1)
900 return eacr;
901
902
903 if (aib->esw.q == 0) {
904
905 if (eacr.p0 && !etr_port0_uptodate) {
906 etr_port0 = *aib;
907 if (etr_port0_online)
908 etr_port0_uptodate = 1;
909 }
910 } else {
911
912 if (eacr.p1 && !etr_port1_uptodate) {
913 etr_port1 = *aib;
914 if (etr_port0_online)
915 etr_port1_uptodate = 1;
916 }
917 }
918
919
920
921
922
923 if (!eacr.es || !check_sync_clock())
924 return eacr;
925
926
927
928
929
930
931 if (etr_steai_available) {
932 if (eacr.p0 && !etr_port0_uptodate) {
933 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
934 etr_port0_uptodate = 1;
935 }
936 if (eacr.p1 && !etr_port1_uptodate) {
937 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
938 etr_port1_uptodate = 1;
939 }
940 } else {
941
942
943
944
945 if ((eacr.p0 && !etr_port0_uptodate) ||
946 (eacr.p1 && !etr_port1_uptodate))
947 eacr.dp ^= 1;
948 else
949 eacr.dp = 0;
950 }
951 return eacr;
952}
953
954
955
956
957
958static void etr_update_eacr(struct etr_eacr eacr)
959{
960 int dp_changed;
961
962 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
963
964 return;
965
966
967
968
969 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
970 (etr_eacr.dp ^ eacr.dp) != 0;
971 etr_eacr = eacr;
972 etr_setr(&etr_eacr);
973 if (dp_changed)
974 etr_tolec = get_clock();
975}
976
977
978
979
980
981
982static void etr_work_fn(struct work_struct *work)
983{
984 unsigned long long now;
985 struct etr_eacr eacr;
986 struct etr_aib aib;
987 int sync_port;
988
989
990 mutex_lock(&etr_work_mutex);
991
992
993 eacr = etr_eacr;
994
995
996 eacr = etr_handle_events(eacr);
997
998
999 eacr.ea = eacr.p0 || eacr.p1;
1000 if (!eacr.ea) {
1001
1002 eacr.dp = eacr.es = eacr.sl = 0;
1003 on_each_cpu(disable_sync_clock, NULL, 1);
1004 del_timer_sync(&etr_timer);
1005 etr_update_eacr(eacr);
1006 goto out_unlock;
1007 }
1008
1009
1010 BUG_ON(etr_stetr(&aib) != 0);
1011 etr_port0.esw = etr_port1.esw = aib.esw;
1012 now = get_clock();
1013
1014
1015
1016
1017
1018 if (now >= etr_tolec + (1600000 << 12))
1019 eacr = etr_handle_update(&aib, eacr);
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1035 eacr.sl = 0;
1036 eacr.e0 = 1;
1037 if (!etr_mode_is_pps(etr_eacr))
1038 eacr.es = 0;
1039 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1040 eacr.e1 = 0;
1041
1042 else if (etr_port0_uptodate && etr_port1_uptodate)
1043 eacr.e1 = 1;
1044 sync_port = (etr_port0_uptodate &&
1045 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1046 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1047 eacr.sl = 0;
1048 eacr.e0 = 0;
1049 eacr.e1 = 1;
1050 if (!etr_mode_is_pps(etr_eacr))
1051 eacr.es = 0;
1052 sync_port = (etr_port1_uptodate &&
1053 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1054 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1055 eacr.sl = 1;
1056 eacr.e0 = 1;
1057 if (!etr_mode_is_etr(etr_eacr))
1058 eacr.es = 0;
1059 if (!eacr.es || !eacr.p1 ||
1060 aib.esw.psc1 != etr_lpsc_operational_alt)
1061 eacr.e1 = 0;
1062 else if (etr_port0_uptodate && etr_port1_uptodate &&
1063 etr_compare_network(&etr_port0, &etr_port1))
1064 eacr.e1 = 1;
1065 sync_port = (etr_port0_uptodate &&
1066 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1067 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1068 eacr.sl = 1;
1069 eacr.e0 = 0;
1070 eacr.e1 = 1;
1071 if (!etr_mode_is_etr(etr_eacr))
1072 eacr.es = 0;
1073 sync_port = (etr_port1_uptodate &&
1074 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1075 } else {
1076
1077 eacr.es = eacr.sl = 0;
1078 sync_port = -1;
1079 }
1080
1081
1082
1083
1084
1085 if ((eacr.es && check_sync_clock()) || sync_port < 0) {
1086 etr_update_eacr(eacr);
1087 etr_set_tolec_timeout(now);
1088 goto out_unlock;
1089 }
1090
1091
1092
1093
1094
1095 eacr.dp = 0;
1096 eacr.es = 1;
1097
1098
1099
1100
1101
1102
1103
1104
1105 etr_update_eacr(eacr);
1106 if (now < etr_tolec + (1600000 << 12) ||
1107 etr_sync_clock_stop(&aib, sync_port) != 0) {
1108
1109 eacr.es = 0;
1110 etr_update_eacr(eacr);
1111 etr_set_sync_timeout();
1112 } else
1113 etr_set_tolec_timeout(now);
1114out_unlock:
1115 mutex_unlock(&etr_work_mutex);
1116}
1117
1118
1119
1120
1121static struct bus_type etr_subsys = {
1122 .name = "etr",
1123 .dev_name = "etr",
1124};
1125
1126static struct device etr_port0_dev = {
1127 .id = 0,
1128 .bus = &etr_subsys,
1129};
1130
1131static struct device etr_port1_dev = {
1132 .id = 1,
1133 .bus = &etr_subsys,
1134};
1135
1136
1137
1138
1139static ssize_t etr_stepping_port_show(struct device *dev,
1140 struct device_attribute *attr,
1141 char *buf)
1142{
1143 return sprintf(buf, "%i\n", etr_port0.esw.p);
1144}
1145
1146static DEVICE_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1147
1148static ssize_t etr_stepping_mode_show(struct device *dev,
1149 struct device_attribute *attr,
1150 char *buf)
1151{
1152 char *mode_str;
1153
1154 if (etr_mode_is_pps(etr_eacr))
1155 mode_str = "pps";
1156 else if (etr_mode_is_etr(etr_eacr))
1157 mode_str = "etr";
1158 else
1159 mode_str = "local";
1160 return sprintf(buf, "%s\n", mode_str);
1161}
1162
1163static DEVICE_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1164
1165
1166
1167
1168static inline struct etr_aib *etr_aib_from_dev(struct device *dev)
1169{
1170 if (dev == &etr_port0_dev)
1171 return etr_port0_online ? &etr_port0 : NULL;
1172 else
1173 return etr_port1_online ? &etr_port1 : NULL;
1174}
1175
1176static ssize_t etr_online_show(struct device *dev,
1177 struct device_attribute *attr,
1178 char *buf)
1179{
1180 unsigned int online;
1181
1182 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1183 return sprintf(buf, "%i\n", online);
1184}
1185
1186static ssize_t etr_online_store(struct device *dev,
1187 struct device_attribute *attr,
1188 const char *buf, size_t count)
1189{
1190 unsigned int value;
1191
1192 value = simple_strtoul(buf, NULL, 0);
1193 if (value != 0 && value != 1)
1194 return -EINVAL;
1195 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1196 return -EOPNOTSUPP;
1197 mutex_lock(&clock_sync_mutex);
1198 if (dev == &etr_port0_dev) {
1199 if (etr_port0_online == value)
1200 goto out;
1201 etr_port0_online = value;
1202 if (etr_port0_online && etr_port1_online)
1203 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1204 else
1205 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1206 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1207 queue_work(time_sync_wq, &etr_work);
1208 } else {
1209 if (etr_port1_online == value)
1210 goto out;
1211 etr_port1_online = value;
1212 if (etr_port0_online && etr_port1_online)
1213 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1214 else
1215 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1216 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1217 queue_work(time_sync_wq, &etr_work);
1218 }
1219out:
1220 mutex_unlock(&clock_sync_mutex);
1221 return count;
1222}
1223
1224static DEVICE_ATTR(online, 0600, etr_online_show, etr_online_store);
1225
1226static ssize_t etr_stepping_control_show(struct device *dev,
1227 struct device_attribute *attr,
1228 char *buf)
1229{
1230 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1231 etr_eacr.e0 : etr_eacr.e1);
1232}
1233
1234static DEVICE_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1235
1236static ssize_t etr_mode_code_show(struct device *dev,
1237 struct device_attribute *attr, char *buf)
1238{
1239 if (!etr_port0_online && !etr_port1_online)
1240
1241 return -ENODATA;
1242 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1243 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1244}
1245
1246static DEVICE_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1247
1248static ssize_t etr_untuned_show(struct device *dev,
1249 struct device_attribute *attr, char *buf)
1250{
1251 struct etr_aib *aib = etr_aib_from_dev(dev);
1252
1253 if (!aib || !aib->slsw.v1)
1254 return -ENODATA;
1255 return sprintf(buf, "%i\n", aib->edf1.u);
1256}
1257
1258static DEVICE_ATTR(untuned, 0400, etr_untuned_show, NULL);
1259
1260static ssize_t etr_network_id_show(struct device *dev,
1261 struct device_attribute *attr, char *buf)
1262{
1263 struct etr_aib *aib = etr_aib_from_dev(dev);
1264
1265 if (!aib || !aib->slsw.v1)
1266 return -ENODATA;
1267 return sprintf(buf, "%i\n", aib->edf1.net_id);
1268}
1269
1270static DEVICE_ATTR(network, 0400, etr_network_id_show, NULL);
1271
1272static ssize_t etr_id_show(struct device *dev,
1273 struct device_attribute *attr, char *buf)
1274{
1275 struct etr_aib *aib = etr_aib_from_dev(dev);
1276
1277 if (!aib || !aib->slsw.v1)
1278 return -ENODATA;
1279 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1280}
1281
1282static DEVICE_ATTR(id, 0400, etr_id_show, NULL);
1283
1284static ssize_t etr_port_number_show(struct device *dev,
1285 struct device_attribute *attr, char *buf)
1286{
1287 struct etr_aib *aib = etr_aib_from_dev(dev);
1288
1289 if (!aib || !aib->slsw.v1)
1290 return -ENODATA;
1291 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1292}
1293
1294static DEVICE_ATTR(port, 0400, etr_port_number_show, NULL);
1295
1296static ssize_t etr_coupled_show(struct device *dev,
1297 struct device_attribute *attr, char *buf)
1298{
1299 struct etr_aib *aib = etr_aib_from_dev(dev);
1300
1301 if (!aib || !aib->slsw.v3)
1302 return -ENODATA;
1303 return sprintf(buf, "%i\n", aib->edf3.c);
1304}
1305
1306static DEVICE_ATTR(coupled, 0400, etr_coupled_show, NULL);
1307
1308static ssize_t etr_local_time_show(struct device *dev,
1309 struct device_attribute *attr, char *buf)
1310{
1311 struct etr_aib *aib = etr_aib_from_dev(dev);
1312
1313 if (!aib || !aib->slsw.v3)
1314 return -ENODATA;
1315 return sprintf(buf, "%i\n", aib->edf3.blto);
1316}
1317
1318static DEVICE_ATTR(local_time, 0400, etr_local_time_show, NULL);
1319
1320static ssize_t etr_utc_offset_show(struct device *dev,
1321 struct device_attribute *attr, char *buf)
1322{
1323 struct etr_aib *aib = etr_aib_from_dev(dev);
1324
1325 if (!aib || !aib->slsw.v3)
1326 return -ENODATA;
1327 return sprintf(buf, "%i\n", aib->edf3.buo);
1328}
1329
1330static DEVICE_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1331
1332static struct device_attribute *etr_port_attributes[] = {
1333 &dev_attr_online,
1334 &dev_attr_stepping_control,
1335 &dev_attr_state_code,
1336 &dev_attr_untuned,
1337 &dev_attr_network,
1338 &dev_attr_id,
1339 &dev_attr_port,
1340 &dev_attr_coupled,
1341 &dev_attr_local_time,
1342 &dev_attr_utc_offset,
1343 NULL
1344};
1345
1346static int __init etr_register_port(struct device *dev)
1347{
1348 struct device_attribute **attr;
1349 int rc;
1350
1351 rc = device_register(dev);
1352 if (rc)
1353 goto out;
1354 for (attr = etr_port_attributes; *attr; attr++) {
1355 rc = device_create_file(dev, *attr);
1356 if (rc)
1357 goto out_unreg;
1358 }
1359 return 0;
1360out_unreg:
1361 for (; attr >= etr_port_attributes; attr--)
1362 device_remove_file(dev, *attr);
1363 device_unregister(dev);
1364out:
1365 return rc;
1366}
1367
1368static void __init etr_unregister_port(struct device *dev)
1369{
1370 struct device_attribute **attr;
1371
1372 for (attr = etr_port_attributes; *attr; attr++)
1373 device_remove_file(dev, *attr);
1374 device_unregister(dev);
1375}
1376
1377static int __init etr_init_sysfs(void)
1378{
1379 int rc;
1380
1381 rc = subsys_system_register(&etr_subsys, NULL);
1382 if (rc)
1383 goto out;
1384 rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_port);
1385 if (rc)
1386 goto out_unreg_subsys;
1387 rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
1388 if (rc)
1389 goto out_remove_stepping_port;
1390 rc = etr_register_port(&etr_port0_dev);
1391 if (rc)
1392 goto out_remove_stepping_mode;
1393 rc = etr_register_port(&etr_port1_dev);
1394 if (rc)
1395 goto out_remove_port0;
1396 return 0;
1397
1398out_remove_port0:
1399 etr_unregister_port(&etr_port0_dev);
1400out_remove_stepping_mode:
1401 device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
1402out_remove_stepping_port:
1403 device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_port);
1404out_unreg_subsys:
1405 bus_unregister(&etr_subsys);
1406out:
1407 return rc;
1408}
1409
1410device_initcall(etr_init_sysfs);
1411
1412
1413
1414
1415static int stp_online;
1416static struct stp_sstpi stp_info;
1417static void *stp_page;
1418
1419static void stp_work_fn(struct work_struct *work);
1420static DEFINE_MUTEX(stp_work_mutex);
1421static DECLARE_WORK(stp_work, stp_work_fn);
1422static struct timer_list stp_timer;
1423
1424static int __init early_parse_stp(char *p)
1425{
1426 if (strncmp(p, "off", 3) == 0)
1427 stp_online = 0;
1428 else if (strncmp(p, "on", 2) == 0)
1429 stp_online = 1;
1430 return 0;
1431}
1432early_param("stp", early_parse_stp);
1433
1434
1435
1436
1437static void __init stp_reset(void)
1438{
1439 int rc;
1440
1441 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1442 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1443 if (rc == 0)
1444 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1445 else if (stp_online) {
1446 pr_warning("The real or virtual hardware system does "
1447 "not provide an STP interface\n");
1448 free_page((unsigned long) stp_page);
1449 stp_page = NULL;
1450 stp_online = 0;
1451 }
1452}
1453
1454static void stp_timeout(unsigned long dummy)
1455{
1456 queue_work(time_sync_wq, &stp_work);
1457}
1458
1459static int __init stp_init(void)
1460{
1461 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1462 return 0;
1463 setup_timer(&stp_timer, stp_timeout, 0UL);
1464 time_init_wq();
1465 if (!stp_online)
1466 return 0;
1467 queue_work(time_sync_wq, &stp_work);
1468 return 0;
1469}
1470
1471arch_initcall(stp_init);
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481static void stp_timing_alert(struct stp_irq_parm *intparm)
1482{
1483 if (intparm->tsc || intparm->lac || intparm->tcpc)
1484 queue_work(time_sync_wq, &stp_work);
1485}
1486
1487
1488
1489
1490
1491
1492
1493void stp_sync_check(void)
1494{
1495 disable_sync_clock(NULL);
1496 queue_work(time_sync_wq, &stp_work);
1497}
1498
1499
1500
1501
1502
1503
1504
1505void stp_island_check(void)
1506{
1507 disable_sync_clock(NULL);
1508 queue_work(time_sync_wq, &stp_work);
1509}
1510
1511
1512static int stp_sync_clock(void *data)
1513{
1514 static int first;
1515 unsigned long long old_clock, delta;
1516 struct clock_sync_data *stp_sync;
1517 int rc;
1518
1519 stp_sync = data;
1520
1521 if (xchg(&first, 1) == 1) {
1522
1523 clock_sync_cpu(stp_sync);
1524 return 0;
1525 }
1526
1527
1528 while (atomic_read(&stp_sync->cpus) != 0)
1529 cpu_relax();
1530
1531 enable_sync_clock();
1532
1533 rc = 0;
1534 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1535 stp_info.todoff[2] || stp_info.todoff[3] ||
1536 stp_info.tmd != 2) {
1537 old_clock = get_clock();
1538 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1539 if (rc == 0) {
1540 delta = adjust_time(old_clock, get_clock(), 0);
1541 fixup_clock_comparator(delta);
1542 rc = chsc_sstpi(stp_page, &stp_info,
1543 sizeof(struct stp_sstpi));
1544 if (rc == 0 && stp_info.tmd != 2)
1545 rc = -EAGAIN;
1546 }
1547 }
1548 if (rc) {
1549 disable_sync_clock(NULL);
1550 stp_sync->in_sync = -EAGAIN;
1551 } else
1552 stp_sync->in_sync = 1;
1553 xchg(&first, 0);
1554 return 0;
1555}
1556
1557
1558
1559
1560
1561static void stp_work_fn(struct work_struct *work)
1562{
1563 struct clock_sync_data stp_sync;
1564 int rc;
1565
1566
1567 mutex_lock(&stp_work_mutex);
1568
1569 if (!stp_online) {
1570 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1571 del_timer_sync(&stp_timer);
1572 goto out_unlock;
1573 }
1574
1575 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1576 if (rc)
1577 goto out_unlock;
1578
1579 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1580 if (rc || stp_info.c == 0)
1581 goto out_unlock;
1582
1583
1584 if (check_sync_clock())
1585 goto out_unlock;
1586
1587 memset(&stp_sync, 0, sizeof(stp_sync));
1588 get_online_cpus();
1589 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1590 stop_machine(stp_sync_clock, &stp_sync, cpu_online_mask);
1591 put_online_cpus();
1592
1593 if (!check_sync_clock())
1594
1595
1596
1597
1598 mod_timer(&stp_timer, jiffies + HZ);
1599
1600out_unlock:
1601 mutex_unlock(&stp_work_mutex);
1602}
1603
1604
1605
1606
1607static struct bus_type stp_subsys = {
1608 .name = "stp",
1609 .dev_name = "stp",
1610};
1611
1612static ssize_t stp_ctn_id_show(struct device *dev,
1613 struct device_attribute *attr,
1614 char *buf)
1615{
1616 if (!stp_online)
1617 return -ENODATA;
1618 return sprintf(buf, "%016llx\n",
1619 *(unsigned long long *) stp_info.ctnid);
1620}
1621
1622static DEVICE_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1623
1624static ssize_t stp_ctn_type_show(struct device *dev,
1625 struct device_attribute *attr,
1626 char *buf)
1627{
1628 if (!stp_online)
1629 return -ENODATA;
1630 return sprintf(buf, "%i\n", stp_info.ctn);
1631}
1632
1633static DEVICE_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1634
1635static ssize_t stp_dst_offset_show(struct device *dev,
1636 struct device_attribute *attr,
1637 char *buf)
1638{
1639 if (!stp_online || !(stp_info.vbits & 0x2000))
1640 return -ENODATA;
1641 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1642}
1643
1644static DEVICE_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1645
1646static ssize_t stp_leap_seconds_show(struct device *dev,
1647 struct device_attribute *attr,
1648 char *buf)
1649{
1650 if (!stp_online || !(stp_info.vbits & 0x8000))
1651 return -ENODATA;
1652 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1653}
1654
1655static DEVICE_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1656
1657static ssize_t stp_stratum_show(struct device *dev,
1658 struct device_attribute *attr,
1659 char *buf)
1660{
1661 if (!stp_online)
1662 return -ENODATA;
1663 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1664}
1665
1666static DEVICE_ATTR(stratum, 0400, stp_stratum_show, NULL);
1667
1668static ssize_t stp_time_offset_show(struct device *dev,
1669 struct device_attribute *attr,
1670 char *buf)
1671{
1672 if (!stp_online || !(stp_info.vbits & 0x0800))
1673 return -ENODATA;
1674 return sprintf(buf, "%i\n", (int) stp_info.tto);
1675}
1676
1677static DEVICE_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1678
1679static ssize_t stp_time_zone_offset_show(struct device *dev,
1680 struct device_attribute *attr,
1681 char *buf)
1682{
1683 if (!stp_online || !(stp_info.vbits & 0x4000))
1684 return -ENODATA;
1685 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1686}
1687
1688static DEVICE_ATTR(time_zone_offset, 0400,
1689 stp_time_zone_offset_show, NULL);
1690
1691static ssize_t stp_timing_mode_show(struct device *dev,
1692 struct device_attribute *attr,
1693 char *buf)
1694{
1695 if (!stp_online)
1696 return -ENODATA;
1697 return sprintf(buf, "%i\n", stp_info.tmd);
1698}
1699
1700static DEVICE_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1701
1702static ssize_t stp_timing_state_show(struct device *dev,
1703 struct device_attribute *attr,
1704 char *buf)
1705{
1706 if (!stp_online)
1707 return -ENODATA;
1708 return sprintf(buf, "%i\n", stp_info.tst);
1709}
1710
1711static DEVICE_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1712
1713static ssize_t stp_online_show(struct device *dev,
1714 struct device_attribute *attr,
1715 char *buf)
1716{
1717 return sprintf(buf, "%i\n", stp_online);
1718}
1719
1720static ssize_t stp_online_store(struct device *dev,
1721 struct device_attribute *attr,
1722 const char *buf, size_t count)
1723{
1724 unsigned int value;
1725
1726 value = simple_strtoul(buf, NULL, 0);
1727 if (value != 0 && value != 1)
1728 return -EINVAL;
1729 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1730 return -EOPNOTSUPP;
1731 mutex_lock(&clock_sync_mutex);
1732 stp_online = value;
1733 if (stp_online)
1734 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1735 else
1736 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1737 queue_work(time_sync_wq, &stp_work);
1738 mutex_unlock(&clock_sync_mutex);
1739 return count;
1740}
1741
1742
1743
1744
1745
1746static struct device_attribute dev_attr_stp_online = {
1747 .attr = { .name = "online", .mode = 0600 },
1748 .show = stp_online_show,
1749 .store = stp_online_store,
1750};
1751
1752static struct device_attribute *stp_attributes[] = {
1753 &dev_attr_ctn_id,
1754 &dev_attr_ctn_type,
1755 &dev_attr_dst_offset,
1756 &dev_attr_leap_seconds,
1757 &dev_attr_stp_online,
1758 &dev_attr_stratum,
1759 &dev_attr_time_offset,
1760 &dev_attr_time_zone_offset,
1761 &dev_attr_timing_mode,
1762 &dev_attr_timing_state,
1763 NULL
1764};
1765
1766static int __init stp_init_sysfs(void)
1767{
1768 struct device_attribute **attr;
1769 int rc;
1770
1771 rc = subsys_system_register(&stp_subsys, NULL);
1772 if (rc)
1773 goto out;
1774 for (attr = stp_attributes; *attr; attr++) {
1775 rc = device_create_file(stp_subsys.dev_root, *attr);
1776 if (rc)
1777 goto out_unreg;
1778 }
1779 return 0;
1780out_unreg:
1781 for (; attr >= stp_attributes; attr--)
1782 device_remove_file(stp_subsys.dev_root, *attr);
1783 bus_unregister(&stp_subsys);
1784out:
1785 return rc;
1786}
1787
1788device_initcall(stp_init_sysfs);
1789