2 * Time of day based timer functions.
5 * Copyright IBM Corp. 1999, 2008
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com),
8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
10 * Derived from "arch/i386/kernel/time.c"
11 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
14 #define KMSG_COMPONENT "time"
15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
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/timekeeper_internal.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>
46 #include <asm/irq_regs.h>
47 #include <asm/vtimer.h>
52 /* change this if you have some constant time drift */
53 #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
54 #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
56 u64 sched_clock_base_cc = -1; /* Force to data section. */
57 EXPORT_SYMBOL_GPL(sched_clock_base_cc);
59 static DEFINE_PER_CPU(struct clock_event_device, comparators);
62 * Scheduler clock - returns current time in nanosec units.
64 unsigned long long notrace __kprobes sched_clock(void)
66 return tod_to_ns(get_tod_clock_monotonic());
70 * Monotonic_clock - returns # of nanoseconds passed since time_init()
72 unsigned long long monotonic_clock(void)
76 EXPORT_SYMBOL(monotonic_clock);
78 void tod_to_timeval(__u64 todval, struct timespec *xt)
80 unsigned long long sec;
85 todval -= (sec * 1000000) << 12;
86 xt->tv_nsec = ((todval * 1000) >> 12);
88 EXPORT_SYMBOL(tod_to_timeval);
90 void clock_comparator_work(void)
92 struct clock_event_device *cd;
94 S390_lowcore.clock_comparator = -1ULL;
95 cd = &__get_cpu_var(comparators);
96 cd->event_handler(cd);
100 * Fixup the clock comparator.
102 static void fixup_clock_comparator(unsigned long long delta)
104 /* If nobody is waiting there's nothing to fix. */
105 if (S390_lowcore.clock_comparator == -1ULL)
107 S390_lowcore.clock_comparator += delta;
108 set_clock_comparator(S390_lowcore.clock_comparator);
111 static int s390_next_ktime(ktime_t expires,
112 struct clock_event_device *evt)
117 ts.tv_sec = ts.tv_nsec = 0;
118 monotonic_to_bootbased(&ts);
119 nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
121 S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
122 /* Program the maximum value if we have an overflow (== year 2042) */
123 if (unlikely(S390_lowcore.clock_comparator < sched_clock_base_cc))
124 S390_lowcore.clock_comparator = -1ULL;
125 set_clock_comparator(S390_lowcore.clock_comparator);
129 static void s390_set_mode(enum clock_event_mode mode,
130 struct clock_event_device *evt)
135 * Set up lowcore and control register of the current cpu to
136 * enable TOD clock and clock comparator interrupts.
138 void init_cpu_timer(void)
140 struct clock_event_device *cd;
143 S390_lowcore.clock_comparator = -1ULL;
144 set_clock_comparator(S390_lowcore.clock_comparator);
146 cpu = smp_processor_id();
147 cd = &per_cpu(comparators, cpu);
148 cd->name = "comparator";
149 cd->features = CLOCK_EVT_FEAT_ONESHOT |
150 CLOCK_EVT_FEAT_KTIME;
153 cd->min_delta_ns = 1;
154 cd->max_delta_ns = LONG_MAX;
156 cd->cpumask = cpumask_of(cpu);
157 cd->set_next_ktime = s390_next_ktime;
158 cd->set_mode = s390_set_mode;
160 clockevents_register_device(cd);
162 /* Enable clock comparator timer interrupt. */
165 /* Always allow the timing alert external interrupt. */
169 static void clock_comparator_interrupt(struct ext_code ext_code,
170 unsigned int param32,
171 unsigned long param64)
173 inc_irq_stat(IRQEXT_CLK);
174 if (S390_lowcore.clock_comparator == -1ULL)
175 set_clock_comparator(S390_lowcore.clock_comparator);
178 static void etr_timing_alert(struct etr_irq_parm *);
179 static void stp_timing_alert(struct stp_irq_parm *);
181 static void timing_alert_interrupt(struct ext_code ext_code,
182 unsigned int param32, unsigned long param64)
184 inc_irq_stat(IRQEXT_TLA);
185 if (param32 & 0x00c40000)
186 etr_timing_alert((struct etr_irq_parm *) ¶m32);
187 if (param32 & 0x00038000)
188 stp_timing_alert((struct stp_irq_parm *) ¶m32);
191 static void etr_reset(void);
192 static void stp_reset(void);
194 void read_persistent_clock(struct timespec *ts)
196 tod_to_timeval(get_tod_clock() - TOD_UNIX_EPOCH, ts);
199 void read_boot_clock(struct timespec *ts)
201 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
204 static cycle_t read_tod_clock(struct clocksource *cs)
206 return get_tod_clock();
209 static struct clocksource clocksource_tod = {
212 .read = read_tod_clock,
216 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
219 struct clocksource * __init clocksource_default_clock(void)
221 return &clocksource_tod;
224 void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
225 struct clocksource *clock, u32 mult)
227 if (clock != &clocksource_tod)
230 /* Make userspace gettimeofday spin until we're done. */
231 ++vdso_data->tb_update_count;
233 vdso_data->xtime_tod_stamp = clock->cycle_last;
234 vdso_data->xtime_clock_sec = wall_time->tv_sec;
235 vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
236 vdso_data->wtom_clock_sec = wtm->tv_sec;
237 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
238 vdso_data->ntp_mult = mult;
240 ++vdso_data->tb_update_count;
243 extern struct timezone sys_tz;
245 void update_vsyscall_tz(void)
247 /* Make userspace gettimeofday spin until we're done. */
248 ++vdso_data->tb_update_count;
250 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
251 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
253 ++vdso_data->tb_update_count;
257 * Initialize the TOD clock and the CPU timer of
260 void __init time_init(void)
262 /* Reset time synchronization interfaces. */
266 /* request the clock comparator external interrupt */
267 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
268 panic("Couldn't request external interrupt 0x1004");
270 /* request the timing alert external interrupt */
271 if (register_external_interrupt(0x1406, timing_alert_interrupt))
272 panic("Couldn't request external interrupt 0x1406");
274 if (clocksource_register(&clocksource_tod) != 0)
275 panic("Could not register TOD clock source");
277 /* Enable TOD clock interrupts on the boot cpu. */
280 /* Enable cpu timer interrupts on the boot cpu. */
285 * The time is "clock". old is what we think the time is.
286 * Adjust the value by a multiple of jiffies and add the delta to ntp.
287 * "delay" is an approximation how long the synchronization took. If
288 * the time correction is positive, then "delay" is subtracted from
289 * the time difference and only the remaining part is passed to ntp.
291 static unsigned long long adjust_time(unsigned long long old,
292 unsigned long long clock,
293 unsigned long long delay)
295 unsigned long long delta, ticks;
299 /* It is later than we thought. */
300 delta = ticks = clock - old;
301 delta = ticks = (delta < delay) ? 0 : delta - delay;
302 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
303 adjust.offset = ticks * (1000000 / HZ);
305 /* It is earlier than we thought. */
306 delta = ticks = old - clock;
307 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
309 adjust.offset = -ticks * (1000000 / HZ);
311 sched_clock_base_cc += delta;
312 if (adjust.offset != 0) {
313 pr_notice("The ETR interface has adjusted the clock "
314 "by %li microseconds\n", adjust.offset);
315 adjust.modes = ADJ_OFFSET_SINGLESHOT;
316 do_adjtimex(&adjust);
321 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
322 static DEFINE_MUTEX(clock_sync_mutex);
323 static unsigned long clock_sync_flags;
325 #define CLOCK_SYNC_HAS_ETR 0
326 #define CLOCK_SYNC_HAS_STP 1
327 #define CLOCK_SYNC_ETR 2
328 #define CLOCK_SYNC_STP 3
331 * The synchronous get_clock function. It will write the current clock
332 * value to the clock pointer and return 0 if the clock is in sync with
333 * the external time source. If the clock mode is local it will return
334 * -EOPNOTSUPP and -EAGAIN if the clock is not in sync with the external
337 int get_sync_clock(unsigned long long *clock)
340 unsigned int sw0, sw1;
342 sw_ptr = &get_cpu_var(clock_sync_word);
343 sw0 = atomic_read(sw_ptr);
344 *clock = get_tod_clock();
345 sw1 = atomic_read(sw_ptr);
346 put_cpu_var(clock_sync_word);
347 if (sw0 == sw1 && (sw0 & 0x80000000U))
348 /* Success: time is in sync. */
350 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
351 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
353 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
354 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
358 EXPORT_SYMBOL(get_sync_clock);
361 * Make get_sync_clock return -EAGAIN.
363 static void disable_sync_clock(void *dummy)
365 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
367 * Clear the in-sync bit 2^31. All get_sync_clock calls will
368 * fail until the sync bit is turned back on. In addition
369 * increase the "sequence" counter to avoid the race of an
370 * etr event and the complete recovery against get_sync_clock.
372 atomic_clear_mask(0x80000000, sw_ptr);
377 * Make get_sync_clock return 0 again.
378 * Needs to be called from a context disabled for preemption.
380 static void enable_sync_clock(void)
382 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
383 atomic_set_mask(0x80000000, sw_ptr);
387 * Function to check if the clock is in sync.
389 static inline int check_sync_clock(void)
394 sw_ptr = &get_cpu_var(clock_sync_word);
395 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
396 put_cpu_var(clock_sync_word);
400 /* Single threaded workqueue used for etr and stp sync events */
401 static struct workqueue_struct *time_sync_wq;
403 static void __init time_init_wq(void)
407 time_sync_wq = create_singlethread_workqueue("timesync");
411 * External Time Reference (ETR) code.
413 static int etr_port0_online;
414 static int etr_port1_online;
415 static int etr_steai_available;
417 static int __init early_parse_etr(char *p)
419 if (strncmp(p, "off", 3) == 0)
420 etr_port0_online = etr_port1_online = 0;
421 else if (strncmp(p, "port0", 5) == 0)
422 etr_port0_online = 1;
423 else if (strncmp(p, "port1", 5) == 0)
424 etr_port1_online = 1;
425 else if (strncmp(p, "on", 2) == 0)
426 etr_port0_online = etr_port1_online = 1;
429 early_param("etr", early_parse_etr);
432 ETR_EVENT_PORT0_CHANGE,
433 ETR_EVENT_PORT1_CHANGE,
434 ETR_EVENT_PORT_ALERT,
435 ETR_EVENT_SYNC_CHECK,
436 ETR_EVENT_SWITCH_LOCAL,
441 * Valid bit combinations of the eacr register are (x = don't care):
442 * e0 e1 dp p0 p1 ea es sl
443 * 0 0 x 0 0 0 0 0 initial, disabled state
444 * 0 0 x 0 1 1 0 0 port 1 online
445 * 0 0 x 1 0 1 0 0 port 0 online
446 * 0 0 x 1 1 1 0 0 both ports online
447 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
448 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
449 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
450 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
451 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
452 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
453 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
454 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
455 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
456 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
457 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
458 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
459 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
460 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
461 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
462 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
464 static struct etr_eacr etr_eacr;
465 static u64 etr_tolec; /* time of last eacr update */
466 static struct etr_aib etr_port0;
467 static int etr_port0_uptodate;
468 static struct etr_aib etr_port1;
469 static int etr_port1_uptodate;
470 static unsigned long etr_events;
471 static struct timer_list etr_timer;
473 static void etr_timeout(unsigned long dummy);
474 static void etr_work_fn(struct work_struct *work);
475 static DEFINE_MUTEX(etr_work_mutex);
476 static DECLARE_WORK(etr_work, etr_work_fn);
479 * Reset ETR attachment.
481 static void etr_reset(void)
483 etr_eacr = (struct etr_eacr) {
484 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
485 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
487 if (etr_setr(&etr_eacr) == 0) {
488 etr_tolec = get_tod_clock();
489 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
490 if (etr_port0_online && etr_port1_online)
491 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
492 } else if (etr_port0_online || etr_port1_online) {
493 pr_warning("The real or virtual hardware system does "
494 "not provide an ETR interface\n");
495 etr_port0_online = etr_port1_online = 0;
499 static int __init etr_init(void)
503 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
506 /* Check if this machine has the steai instruction. */
507 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
508 etr_steai_available = 1;
509 setup_timer(&etr_timer, etr_timeout, 0UL);
510 if (etr_port0_online) {
511 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
512 queue_work(time_sync_wq, &etr_work);
514 if (etr_port1_online) {
515 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
516 queue_work(time_sync_wq, &etr_work);
521 arch_initcall(etr_init);
524 * Two sorts of ETR machine checks. The architecture reads:
525 * "When a machine-check niterruption occurs and if a switch-to-local or
526 * ETR-sync-check interrupt request is pending but disabled, this pending
527 * disabled interruption request is indicated and is cleared".
528 * Which means that we can get etr_switch_to_local events from the machine
529 * check handler although the interruption condition is disabled. Lovely..
533 * Switch to local machine check. This is called when the last usable
534 * ETR port goes inactive. After switch to local the clock is not in sync.
536 void etr_switch_to_local(void)
540 disable_sync_clock(NULL);
541 if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) {
542 etr_eacr.es = etr_eacr.sl = 0;
544 queue_work(time_sync_wq, &etr_work);
549 * ETR sync check machine check. This is called when the ETR OTE and the
550 * local clock OTE are farther apart than the ETR sync check tolerance.
551 * After a ETR sync check the clock is not in sync. The machine check
552 * is broadcasted to all cpus at the same time.
554 void etr_sync_check(void)
558 disable_sync_clock(NULL);
559 if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) {
562 queue_work(time_sync_wq, &etr_work);
567 * ETR timing alert. There are two causes:
568 * 1) port state change, check the usability of the port
569 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
570 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
571 * or ETR-data word 4 (edf4) has changed.
573 static void etr_timing_alert(struct etr_irq_parm *intparm)
576 /* ETR port 0 state change. */
577 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
579 /* ETR port 1 state change. */
580 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
583 * ETR port alert on either port 0, 1 or both.
584 * Both ports are not up-to-date now.
586 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
587 queue_work(time_sync_wq, &etr_work);
590 static void etr_timeout(unsigned long dummy)
592 set_bit(ETR_EVENT_UPDATE, &etr_events);
593 queue_work(time_sync_wq, &etr_work);
597 * Check if the etr mode is pss.
599 static inline int etr_mode_is_pps(struct etr_eacr eacr)
601 return eacr.es && !eacr.sl;
605 * Check if the etr mode is etr.
607 static inline int etr_mode_is_etr(struct etr_eacr eacr)
609 return eacr.es && eacr.sl;
613 * Check if the port can be used for TOD synchronization.
614 * For PPS mode the port has to receive OTEs. For ETR mode
615 * the port has to receive OTEs, the ETR stepping bit has to
616 * be zero and the validity bits for data frame 1, 2, and 3
619 static int etr_port_valid(struct etr_aib *aib, int port)
623 /* Check that this port is receiving OTEs. */
627 psc = port ? aib->esw.psc1 : aib->esw.psc0;
628 if (psc == etr_lpsc_pps_mode)
630 if (psc == etr_lpsc_operational_step)
631 return !aib->esw.y && aib->slsw.v1 &&
632 aib->slsw.v2 && aib->slsw.v3;
637 * Check if two ports are on the same network.
639 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
641 // FIXME: any other fields we have to compare?
642 return aib1->edf1.net_id == aib2->edf1.net_id;
646 * Wrapper for etr_stei that converts physical port states
647 * to logical port states to be consistent with the output
648 * of stetr (see etr_psc vs. etr_lpsc).
650 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
652 BUG_ON(etr_steai(aib, func) != 0);
653 /* Convert port state to logical port state. */
654 if (aib->esw.psc0 == 1)
656 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
658 if (aib->esw.psc1 == 1)
660 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
665 * Check if the aib a2 is still connected to the same attachment as
666 * aib a1, the etv values differ by one and a2 is valid.
668 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
670 int state_a1, state_a2;
672 /* Paranoia check: e0/e1 should better be the same. */
673 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
674 a1->esw.eacr.e1 != a2->esw.eacr.e1)
677 /* Still connected to the same etr ? */
678 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
679 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
680 if (state_a1 == etr_lpsc_operational_step) {
681 if (state_a2 != etr_lpsc_operational_step ||
682 a1->edf1.net_id != a2->edf1.net_id ||
683 a1->edf1.etr_id != a2->edf1.etr_id ||
684 a1->edf1.etr_pn != a2->edf1.etr_pn)
686 } else if (state_a2 != etr_lpsc_pps_mode)
689 /* The ETV value of a2 needs to be ETV of a1 + 1. */
690 if (a1->edf2.etv + 1 != a2->edf2.etv)
693 if (!etr_port_valid(a2, p))
699 struct clock_sync_data {
702 unsigned long long fixup_cc;
704 struct etr_aib *etr_aib;
707 static void clock_sync_cpu(struct clock_sync_data *sync)
709 atomic_dec(&sync->cpus);
712 * This looks like a busy wait loop but it isn't. etr_sync_cpus
713 * is called on all other cpus while the TOD clocks is stopped.
714 * __udelay will stop the cpu on an enabled wait psw until the
715 * TOD is running again.
717 while (sync->in_sync == 0) {
720 * A different cpu changes *in_sync. Therefore use
721 * barrier() to force memory access.
725 if (sync->in_sync != 1)
726 /* Didn't work. Clear per-cpu in sync bit again. */
727 disable_sync_clock(NULL);
729 * This round of TOD syncing is done. Set the clock comparator
730 * to the next tick and let the processor continue.
732 fixup_clock_comparator(sync->fixup_cc);
736 * Sync the TOD clock using the port referred to by aibp. This port
737 * has to be enabled and the other port has to be disabled. The
738 * last eacr update has to be more than 1.6 seconds in the past.
740 static int etr_sync_clock(void *data)
743 unsigned long long clock, old_clock, delay, delta;
744 struct clock_sync_data *etr_sync;
745 struct etr_aib *sync_port, *aib;
751 if (xchg(&first, 1) == 1) {
753 clock_sync_cpu(etr_sync);
757 /* Wait until all other cpus entered the sync function. */
758 while (atomic_read(&etr_sync->cpus) != 0)
761 port = etr_sync->etr_port;
762 aib = etr_sync->etr_aib;
763 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
766 /* Set clock to next OTE. */
767 __ctl_set_bit(14, 21);
768 __ctl_set_bit(0, 29);
769 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
770 old_clock = get_tod_clock();
771 if (set_tod_clock(clock) == 0) {
772 __udelay(1); /* Wait for the clock to start. */
773 __ctl_clear_bit(0, 29);
774 __ctl_clear_bit(14, 21);
776 /* Adjust Linux timing variables. */
777 delay = (unsigned long long)
778 (aib->edf2.etv - sync_port->edf2.etv) << 32;
779 delta = adjust_time(old_clock, clock, delay);
780 etr_sync->fixup_cc = delta;
781 fixup_clock_comparator(delta);
782 /* Verify that the clock is properly set. */
783 if (!etr_aib_follows(sync_port, aib, port)) {
785 disable_sync_clock(NULL);
786 etr_sync->in_sync = -EAGAIN;
789 etr_sync->in_sync = 1;
793 /* Could not set the clock ?!? */
794 __ctl_clear_bit(0, 29);
795 __ctl_clear_bit(14, 21);
796 disable_sync_clock(NULL);
797 etr_sync->in_sync = -EAGAIN;
804 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
806 struct clock_sync_data etr_sync;
807 struct etr_aib *sync_port;
811 /* Check if the current aib is adjacent to the sync port aib. */
812 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
813 follows = etr_aib_follows(sync_port, aib, port);
814 memcpy(sync_port, aib, sizeof(*aib));
817 memset(&etr_sync, 0, sizeof(etr_sync));
818 etr_sync.etr_aib = aib;
819 etr_sync.etr_port = port;
821 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
822 rc = stop_machine(etr_sync_clock, &etr_sync, cpu_online_mask);
828 * Handle the immediate effects of the different events.
829 * The port change event is used for online/offline changes.
831 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
833 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
835 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
836 eacr.es = eacr.sl = 0;
837 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
838 etr_port0_uptodate = etr_port1_uptodate = 0;
840 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
843 * Port change of an enabled port. We have to
844 * assume that this can have caused an stepping
847 etr_tolec = get_tod_clock();
848 eacr.p0 = etr_port0_online;
851 etr_port0_uptodate = 0;
853 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
856 * Port change of an enabled port. We have to
857 * assume that this can have caused an stepping
860 etr_tolec = get_tod_clock();
861 eacr.p1 = etr_port1_online;
864 etr_port1_uptodate = 0;
866 clear_bit(ETR_EVENT_UPDATE, &etr_events);
871 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
872 * one of the ports needs an update.
874 static void etr_set_tolec_timeout(unsigned long long now)
876 unsigned long micros;
878 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
879 (!etr_eacr.p1 || etr_port1_uptodate))
881 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
882 micros = (micros > 1600000) ? 0 : 1600000 - micros;
883 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
887 * Set up a time that expires after 1/2 second.
889 static void etr_set_sync_timeout(void)
891 mod_timer(&etr_timer, jiffies + HZ/2);
895 * Update the aib information for one or both ports.
897 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
898 struct etr_eacr eacr)
900 /* With both ports disabled the aib information is useless. */
901 if (!eacr.e0 && !eacr.e1)
904 /* Update port0 or port1 with aib stored in etr_work_fn. */
905 if (aib->esw.q == 0) {
906 /* Information for port 0 stored. */
907 if (eacr.p0 && !etr_port0_uptodate) {
909 if (etr_port0_online)
910 etr_port0_uptodate = 1;
913 /* Information for port 1 stored. */
914 if (eacr.p1 && !etr_port1_uptodate) {
916 if (etr_port0_online)
917 etr_port1_uptodate = 1;
922 * Do not try to get the alternate port aib if the clock
923 * is not in sync yet.
925 if (!eacr.es || !check_sync_clock())
929 * If steai is available we can get the information about
930 * the other port immediately. If only stetr is available the
931 * data-port bit toggle has to be used.
933 if (etr_steai_available) {
934 if (eacr.p0 && !etr_port0_uptodate) {
935 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
936 etr_port0_uptodate = 1;
938 if (eacr.p1 && !etr_port1_uptodate) {
939 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
940 etr_port1_uptodate = 1;
944 * One port was updated above, if the other
945 * port is not uptodate toggle dp bit.
947 if ((eacr.p0 && !etr_port0_uptodate) ||
948 (eacr.p1 && !etr_port1_uptodate))
957 * Write new etr control register if it differs from the current one.
958 * Return 1 if etr_tolec has been updated as well.
960 static void etr_update_eacr(struct etr_eacr eacr)
964 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
965 /* No change, return. */
968 * The disable of an active port of the change of the data port
969 * bit can/will cause a change in the data port.
971 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
972 (etr_eacr.dp ^ eacr.dp) != 0;
976 etr_tolec = get_tod_clock();
980 * ETR work. In this function you'll find the main logic. In
981 * particular this is the only function that calls etr_update_eacr(),
982 * it "controls" the etr control register.
984 static void etr_work_fn(struct work_struct *work)
986 unsigned long long now;
987 struct etr_eacr eacr;
991 /* prevent multiple execution. */
992 mutex_lock(&etr_work_mutex);
994 /* Create working copy of etr_eacr. */
997 /* Check for the different events and their immediate effects. */
998 eacr = etr_handle_events(eacr);
1000 /* Check if ETR is supposed to be active. */
1001 eacr.ea = eacr.p0 || eacr.p1;
1003 /* Both ports offline. Reset everything. */
1004 eacr.dp = eacr.es = eacr.sl = 0;
1005 on_each_cpu(disable_sync_clock, NULL, 1);
1006 del_timer_sync(&etr_timer);
1007 etr_update_eacr(eacr);
1011 /* Store aib to get the current ETR status word. */
1012 BUG_ON(etr_stetr(&aib) != 0);
1013 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
1014 now = get_tod_clock();
1017 * Update the port information if the last stepping port change
1018 * or data port change is older than 1.6 seconds.
1020 if (now >= etr_tolec + (1600000 << 12))
1021 eacr = etr_handle_update(&aib, eacr);
1024 * Select ports to enable. The preferred synchronization mode is PPS.
1025 * If a port can be enabled depends on a number of things:
1026 * 1) The port needs to be online and uptodate. A port is not
1027 * disabled just because it is not uptodate, but it is only
1028 * enabled if it is uptodate.
1029 * 2) The port needs to have the same mode (pps / etr).
1030 * 3) The port needs to be usable -> etr_port_valid() == 1
1031 * 4) To enable the second port the clock needs to be in sync.
1032 * 5) If both ports are useable and are ETR ports, the network id
1033 * has to be the same.
1034 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1036 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1039 if (!etr_mode_is_pps(etr_eacr))
1041 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1043 // FIXME: uptodate checks ?
1044 else if (etr_port0_uptodate && etr_port1_uptodate)
1046 sync_port = (etr_port0_uptodate &&
1047 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1048 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1052 if (!etr_mode_is_pps(etr_eacr))
1054 sync_port = (etr_port1_uptodate &&
1055 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1056 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1059 if (!etr_mode_is_etr(etr_eacr))
1061 if (!eacr.es || !eacr.p1 ||
1062 aib.esw.psc1 != etr_lpsc_operational_alt)
1064 else if (etr_port0_uptodate && etr_port1_uptodate &&
1065 etr_compare_network(&etr_port0, &etr_port1))
1067 sync_port = (etr_port0_uptodate &&
1068 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1069 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1073 if (!etr_mode_is_etr(etr_eacr))
1075 sync_port = (etr_port1_uptodate &&
1076 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1078 /* Both ports not usable. */
1079 eacr.es = eacr.sl = 0;
1084 * If the clock is in sync just update the eacr and return.
1085 * If there is no valid sync port wait for a port update.
1087 if ((eacr.es && check_sync_clock()) || sync_port < 0) {
1088 etr_update_eacr(eacr);
1089 etr_set_tolec_timeout(now);
1094 * Prepare control register for clock syncing
1095 * (reset data port bit, set sync check control.
1101 * Update eacr and try to synchronize the clock. If the update
1102 * of eacr caused a stepping port switch (or if we have to
1103 * assume that a stepping port switch has occurred) or the
1104 * clock syncing failed, reset the sync check control bit
1105 * and set up a timer to try again after 0.5 seconds
1107 etr_update_eacr(eacr);
1108 if (now < etr_tolec + (1600000 << 12) ||
1109 etr_sync_clock_stop(&aib, sync_port) != 0) {
1110 /* Sync failed. Try again in 1/2 second. */
1112 etr_update_eacr(eacr);
1113 etr_set_sync_timeout();
1115 etr_set_tolec_timeout(now);
1117 mutex_unlock(&etr_work_mutex);
1121 * Sysfs interface functions
1123 static struct bus_type etr_subsys = {
1128 static struct device etr_port0_dev = {
1133 static struct device etr_port1_dev = {
1139 * ETR subsys attributes
1141 static ssize_t etr_stepping_port_show(struct device *dev,
1142 struct device_attribute *attr,
1145 return sprintf(buf, "%i\n", etr_port0.esw.p);
1148 static DEVICE_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1150 static ssize_t etr_stepping_mode_show(struct device *dev,
1151 struct device_attribute *attr,
1156 if (etr_mode_is_pps(etr_eacr))
1158 else if (etr_mode_is_etr(etr_eacr))
1162 return sprintf(buf, "%s\n", mode_str);
1165 static DEVICE_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1168 * ETR port attributes
1170 static inline struct etr_aib *etr_aib_from_dev(struct device *dev)
1172 if (dev == &etr_port0_dev)
1173 return etr_port0_online ? &etr_port0 : NULL;
1175 return etr_port1_online ? &etr_port1 : NULL;
1178 static ssize_t etr_online_show(struct device *dev,
1179 struct device_attribute *attr,
1182 unsigned int online;
1184 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1185 return sprintf(buf, "%i\n", online);
1188 static ssize_t etr_online_store(struct device *dev,
1189 struct device_attribute *attr,
1190 const char *buf, size_t count)
1194 value = simple_strtoul(buf, NULL, 0);
1195 if (value != 0 && value != 1)
1197 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1199 mutex_lock(&clock_sync_mutex);
1200 if (dev == &etr_port0_dev) {
1201 if (etr_port0_online == value)
1202 goto out; /* Nothing to do. */
1203 etr_port0_online = value;
1204 if (etr_port0_online && etr_port1_online)
1205 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1207 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1208 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1209 queue_work(time_sync_wq, &etr_work);
1211 if (etr_port1_online == value)
1212 goto out; /* Nothing to do. */
1213 etr_port1_online = value;
1214 if (etr_port0_online && etr_port1_online)
1215 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1217 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1218 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1219 queue_work(time_sync_wq, &etr_work);
1222 mutex_unlock(&clock_sync_mutex);
1226 static DEVICE_ATTR(online, 0600, etr_online_show, etr_online_store);
1228 static ssize_t etr_stepping_control_show(struct device *dev,
1229 struct device_attribute *attr,
1232 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1233 etr_eacr.e0 : etr_eacr.e1);
1236 static DEVICE_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1238 static ssize_t etr_mode_code_show(struct device *dev,
1239 struct device_attribute *attr, char *buf)
1241 if (!etr_port0_online && !etr_port1_online)
1242 /* Status word is not uptodate if both ports are offline. */
1244 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1245 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1248 static DEVICE_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1250 static ssize_t etr_untuned_show(struct device *dev,
1251 struct device_attribute *attr, char *buf)
1253 struct etr_aib *aib = etr_aib_from_dev(dev);
1255 if (!aib || !aib->slsw.v1)
1257 return sprintf(buf, "%i\n", aib->edf1.u);
1260 static DEVICE_ATTR(untuned, 0400, etr_untuned_show, NULL);
1262 static ssize_t etr_network_id_show(struct device *dev,
1263 struct device_attribute *attr, char *buf)
1265 struct etr_aib *aib = etr_aib_from_dev(dev);
1267 if (!aib || !aib->slsw.v1)
1269 return sprintf(buf, "%i\n", aib->edf1.net_id);
1272 static DEVICE_ATTR(network, 0400, etr_network_id_show, NULL);
1274 static ssize_t etr_id_show(struct device *dev,
1275 struct device_attribute *attr, char *buf)
1277 struct etr_aib *aib = etr_aib_from_dev(dev);
1279 if (!aib || !aib->slsw.v1)
1281 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1284 static DEVICE_ATTR(id, 0400, etr_id_show, NULL);
1286 static ssize_t etr_port_number_show(struct device *dev,
1287 struct device_attribute *attr, char *buf)
1289 struct etr_aib *aib = etr_aib_from_dev(dev);
1291 if (!aib || !aib->slsw.v1)
1293 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1296 static DEVICE_ATTR(port, 0400, etr_port_number_show, NULL);
1298 static ssize_t etr_coupled_show(struct device *dev,
1299 struct device_attribute *attr, char *buf)
1301 struct etr_aib *aib = etr_aib_from_dev(dev);
1303 if (!aib || !aib->slsw.v3)
1305 return sprintf(buf, "%i\n", aib->edf3.c);
1308 static DEVICE_ATTR(coupled, 0400, etr_coupled_show, NULL);
1310 static ssize_t etr_local_time_show(struct device *dev,
1311 struct device_attribute *attr, char *buf)
1313 struct etr_aib *aib = etr_aib_from_dev(dev);
1315 if (!aib || !aib->slsw.v3)
1317 return sprintf(buf, "%i\n", aib->edf3.blto);
1320 static DEVICE_ATTR(local_time, 0400, etr_local_time_show, NULL);
1322 static ssize_t etr_utc_offset_show(struct device *dev,
1323 struct device_attribute *attr, char *buf)
1325 struct etr_aib *aib = etr_aib_from_dev(dev);
1327 if (!aib || !aib->slsw.v3)
1329 return sprintf(buf, "%i\n", aib->edf3.buo);
1332 static DEVICE_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1334 static struct device_attribute *etr_port_attributes[] = {
1336 &dev_attr_stepping_control,
1337 &dev_attr_state_code,
1343 &dev_attr_local_time,
1344 &dev_attr_utc_offset,
1348 static int __init etr_register_port(struct device *dev)
1350 struct device_attribute **attr;
1353 rc = device_register(dev);
1356 for (attr = etr_port_attributes; *attr; attr++) {
1357 rc = device_create_file(dev, *attr);
1363 for (; attr >= etr_port_attributes; attr--)
1364 device_remove_file(dev, *attr);
1365 device_unregister(dev);
1370 static void __init etr_unregister_port(struct device *dev)
1372 struct device_attribute **attr;
1374 for (attr = etr_port_attributes; *attr; attr++)
1375 device_remove_file(dev, *attr);
1376 device_unregister(dev);
1379 static int __init etr_init_sysfs(void)
1383 rc = subsys_system_register(&etr_subsys, NULL);
1386 rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_port);
1388 goto out_unreg_subsys;
1389 rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
1391 goto out_remove_stepping_port;
1392 rc = etr_register_port(&etr_port0_dev);
1394 goto out_remove_stepping_mode;
1395 rc = etr_register_port(&etr_port1_dev);
1397 goto out_remove_port0;
1401 etr_unregister_port(&etr_port0_dev);
1402 out_remove_stepping_mode:
1403 device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
1404 out_remove_stepping_port:
1405 device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_port);
1407 bus_unregister(&etr_subsys);
1412 device_initcall(etr_init_sysfs);
1415 * Server Time Protocol (STP) code.
1417 static int stp_online;
1418 static struct stp_sstpi stp_info;
1419 static void *stp_page;
1421 static void stp_work_fn(struct work_struct *work);
1422 static DEFINE_MUTEX(stp_work_mutex);
1423 static DECLARE_WORK(stp_work, stp_work_fn);
1424 static struct timer_list stp_timer;
1426 static int __init early_parse_stp(char *p)
1428 if (strncmp(p, "off", 3) == 0)
1430 else if (strncmp(p, "on", 2) == 0)
1434 early_param("stp", early_parse_stp);
1437 * Reset STP attachment.
1439 static void __init stp_reset(void)
1443 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1444 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1446 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1447 else if (stp_online) {
1448 pr_warning("The real or virtual hardware system does "
1449 "not provide an STP interface\n");
1450 free_page((unsigned long) stp_page);
1456 static void stp_timeout(unsigned long dummy)
1458 queue_work(time_sync_wq, &stp_work);
1461 static int __init stp_init(void)
1463 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1465 setup_timer(&stp_timer, stp_timeout, 0UL);
1469 queue_work(time_sync_wq, &stp_work);
1473 arch_initcall(stp_init);
1476 * STP timing alert. There are three causes:
1477 * 1) timing status change
1478 * 2) link availability change
1479 * 3) time control parameter change
1480 * In all three cases we are only interested in the clock source state.
1481 * If a STP clock source is now available use it.
1483 static void stp_timing_alert(struct stp_irq_parm *intparm)
1485 if (intparm->tsc || intparm->lac || intparm->tcpc)
1486 queue_work(time_sync_wq, &stp_work);
1490 * STP sync check machine check. This is called when the timing state
1491 * changes from the synchronized state to the unsynchronized state.
1492 * After a STP sync check the clock is not in sync. The machine check
1493 * is broadcasted to all cpus at the same time.
1495 void stp_sync_check(void)
1497 disable_sync_clock(NULL);
1498 queue_work(time_sync_wq, &stp_work);
1502 * STP island condition machine check. This is called when an attached
1503 * server attempts to communicate over an STP link and the servers
1504 * have matching CTN ids and have a valid stratum-1 configuration
1505 * but the configurations do not match.
1507 void stp_island_check(void)
1509 disable_sync_clock(NULL);
1510 queue_work(time_sync_wq, &stp_work);
1514 static int stp_sync_clock(void *data)
1517 unsigned long long old_clock, delta;
1518 struct clock_sync_data *stp_sync;
1523 if (xchg(&first, 1) == 1) {
1525 clock_sync_cpu(stp_sync);
1529 /* Wait until all other cpus entered the sync function. */
1530 while (atomic_read(&stp_sync->cpus) != 0)
1533 enable_sync_clock();
1536 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1537 stp_info.todoff[2] || stp_info.todoff[3] ||
1538 stp_info.tmd != 2) {
1539 old_clock = get_tod_clock();
1540 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1542 delta = adjust_time(old_clock, get_tod_clock(), 0);
1543 fixup_clock_comparator(delta);
1544 rc = chsc_sstpi(stp_page, &stp_info,
1545 sizeof(struct stp_sstpi));
1546 if (rc == 0 && stp_info.tmd != 2)
1551 disable_sync_clock(NULL);
1552 stp_sync->in_sync = -EAGAIN;
1554 stp_sync->in_sync = 1;
1560 * STP work. Check for the STP state and take over the clock
1561 * synchronization if the STP clock source is usable.
1563 static void stp_work_fn(struct work_struct *work)
1565 struct clock_sync_data stp_sync;
1568 /* prevent multiple execution. */
1569 mutex_lock(&stp_work_mutex);
1572 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1573 del_timer_sync(&stp_timer);
1577 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1581 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1582 if (rc || stp_info.c == 0)
1585 /* Skip synchronization if the clock is already in sync. */
1586 if (check_sync_clock())
1589 memset(&stp_sync, 0, sizeof(stp_sync));
1591 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1592 stop_machine(stp_sync_clock, &stp_sync, cpu_online_mask);
1595 if (!check_sync_clock())
1597 * There is a usable clock but the synchonization failed.
1598 * Retry after a second.
1600 mod_timer(&stp_timer, jiffies + HZ);
1603 mutex_unlock(&stp_work_mutex);
1607 * STP subsys sysfs interface functions
1609 static struct bus_type stp_subsys = {
1614 static ssize_t stp_ctn_id_show(struct device *dev,
1615 struct device_attribute *attr,
1620 return sprintf(buf, "%016llx\n",
1621 *(unsigned long long *) stp_info.ctnid);
1624 static DEVICE_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1626 static ssize_t stp_ctn_type_show(struct device *dev,
1627 struct device_attribute *attr,
1632 return sprintf(buf, "%i\n", stp_info.ctn);
1635 static DEVICE_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1637 static ssize_t stp_dst_offset_show(struct device *dev,
1638 struct device_attribute *attr,
1641 if (!stp_online || !(stp_info.vbits & 0x2000))
1643 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1646 static DEVICE_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1648 static ssize_t stp_leap_seconds_show(struct device *dev,
1649 struct device_attribute *attr,
1652 if (!stp_online || !(stp_info.vbits & 0x8000))
1654 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1657 static DEVICE_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1659 static ssize_t stp_stratum_show(struct device *dev,
1660 struct device_attribute *attr,
1665 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1668 static DEVICE_ATTR(stratum, 0400, stp_stratum_show, NULL);
1670 static ssize_t stp_time_offset_show(struct device *dev,
1671 struct device_attribute *attr,
1674 if (!stp_online || !(stp_info.vbits & 0x0800))
1676 return sprintf(buf, "%i\n", (int) stp_info.tto);
1679 static DEVICE_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1681 static ssize_t stp_time_zone_offset_show(struct device *dev,
1682 struct device_attribute *attr,
1685 if (!stp_online || !(stp_info.vbits & 0x4000))
1687 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1690 static DEVICE_ATTR(time_zone_offset, 0400,
1691 stp_time_zone_offset_show, NULL);
1693 static ssize_t stp_timing_mode_show(struct device *dev,
1694 struct device_attribute *attr,
1699 return sprintf(buf, "%i\n", stp_info.tmd);
1702 static DEVICE_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1704 static ssize_t stp_timing_state_show(struct device *dev,
1705 struct device_attribute *attr,
1710 return sprintf(buf, "%i\n", stp_info.tst);
1713 static DEVICE_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1715 static ssize_t stp_online_show(struct device *dev,
1716 struct device_attribute *attr,
1719 return sprintf(buf, "%i\n", stp_online);
1722 static ssize_t stp_online_store(struct device *dev,
1723 struct device_attribute *attr,
1724 const char *buf, size_t count)
1728 value = simple_strtoul(buf, NULL, 0);
1729 if (value != 0 && value != 1)
1731 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1733 mutex_lock(&clock_sync_mutex);
1736 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1738 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1739 queue_work(time_sync_wq, &stp_work);
1740 mutex_unlock(&clock_sync_mutex);
1745 * Can't use DEVICE_ATTR because the attribute should be named
1746 * stp/online but dev_attr_online already exists in this file ..
1748 static struct device_attribute dev_attr_stp_online = {
1749 .attr = { .name = "online", .mode = 0600 },
1750 .show = stp_online_show,
1751 .store = stp_online_store,
1754 static struct device_attribute *stp_attributes[] = {
1757 &dev_attr_dst_offset,
1758 &dev_attr_leap_seconds,
1759 &dev_attr_stp_online,
1761 &dev_attr_time_offset,
1762 &dev_attr_time_zone_offset,
1763 &dev_attr_timing_mode,
1764 &dev_attr_timing_state,
1768 static int __init stp_init_sysfs(void)
1770 struct device_attribute **attr;
1773 rc = subsys_system_register(&stp_subsys, NULL);
1776 for (attr = stp_attributes; *attr; attr++) {
1777 rc = device_create_file(stp_subsys.dev_root, *attr);
1783 for (; attr >= stp_attributes; attr--)
1784 device_remove_file(stp_subsys.dev_root, *attr);
1785 bus_unregister(&stp_subsys);
1790 device_initcall(stp_init_sysfs);