2 * arch/s390/kernel/time.c
3 * Time of day based timer functions.
6 * Copyright IBM Corp. 1999, 2008
7 * Author(s): Hartmut Penner (hp@de.ibm.com),
8 * Martin Schwidefsky (schwidefsky@de.ibm.com),
9 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
11 * Derived from "arch/i386/kernel/time.c"
12 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
15 #define KMSG_COMPONENT "time"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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/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 <linux/gfp.h>
40 #include <asm/uaccess.h>
41 #include <asm/delay.h>
42 #include <asm/s390_ext.h>
43 #include <asm/div64.h>
46 #include <asm/irq_regs.h>
47 #include <asm/timer.h>
51 /* change this if you have some constant time drift */
52 #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
53 #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
55 u64 sched_clock_base_cc = -1; /* Force to data section. */
56 EXPORT_SYMBOL_GPL(sched_clock_base_cc);
58 static DEFINE_PER_CPU(struct clock_event_device, comparators);
61 * Scheduler clock - returns current time in nanosec units.
63 unsigned long long notrace sched_clock(void)
65 return (get_clock_monotonic() * 125) >> 9;
69 * Monotonic_clock - returns # of nanoseconds passed since time_init()
71 unsigned long long monotonic_clock(void)
75 EXPORT_SYMBOL(monotonic_clock);
77 void tod_to_timeval(__u64 todval, struct timespec *xt)
79 unsigned long long sec;
84 todval -= (sec * 1000000) << 12;
85 xt->tv_nsec = ((todval * 1000) >> 12);
87 EXPORT_SYMBOL(tod_to_timeval);
89 void clock_comparator_work(void)
91 struct clock_event_device *cd;
93 S390_lowcore.clock_comparator = -1ULL;
94 set_clock_comparator(S390_lowcore.clock_comparator);
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_event(unsigned long delta,
112 struct clock_event_device *evt)
114 S390_lowcore.clock_comparator = get_clock() + delta;
115 set_clock_comparator(S390_lowcore.clock_comparator);
119 static void s390_set_mode(enum clock_event_mode mode,
120 struct clock_event_device *evt)
125 * Set up lowcore and control register of the current cpu to
126 * enable TOD clock and clock comparator interrupts.
128 void init_cpu_timer(void)
130 struct clock_event_device *cd;
133 S390_lowcore.clock_comparator = -1ULL;
134 set_clock_comparator(S390_lowcore.clock_comparator);
136 cpu = smp_processor_id();
137 cd = &per_cpu(comparators, cpu);
138 cd->name = "comparator";
139 cd->features = CLOCK_EVT_FEAT_ONESHOT;
142 cd->min_delta_ns = 1;
143 cd->max_delta_ns = LONG_MAX;
145 cd->cpumask = cpumask_of(cpu);
146 cd->set_next_event = s390_next_event;
147 cd->set_mode = s390_set_mode;
149 clockevents_register_device(cd);
151 /* Enable clock comparator timer interrupt. */
154 /* Always allow the timing alert external interrupt. */
158 static void clock_comparator_interrupt(__u16 code)
160 if (S390_lowcore.clock_comparator == -1ULL)
161 set_clock_comparator(S390_lowcore.clock_comparator);
164 static void etr_timing_alert(struct etr_irq_parm *);
165 static void stp_timing_alert(struct stp_irq_parm *);
167 static void timing_alert_interrupt(__u16 code)
169 if (S390_lowcore.ext_params & 0x00c40000)
170 etr_timing_alert((struct etr_irq_parm *)
171 &S390_lowcore.ext_params);
172 if (S390_lowcore.ext_params & 0x00038000)
173 stp_timing_alert((struct stp_irq_parm *)
174 &S390_lowcore.ext_params);
177 static void etr_reset(void);
178 static void stp_reset(void);
180 void read_persistent_clock(struct timespec *ts)
182 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
185 void read_boot_clock(struct timespec *ts)
187 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
190 static cycle_t read_tod_clock(struct clocksource *cs)
195 static struct clocksource clocksource_tod = {
198 .read = read_tod_clock,
202 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
205 struct clocksource * __init clocksource_default_clock(void)
207 return &clocksource_tod;
210 void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
213 if (clock != &clocksource_tod)
216 /* Make userspace gettimeofday spin until we're done. */
217 ++vdso_data->tb_update_count;
219 vdso_data->xtime_tod_stamp = clock->cycle_last;
220 vdso_data->xtime_clock_sec = wall_time->tv_sec;
221 vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
222 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
223 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
224 vdso_data->ntp_mult = mult;
226 ++vdso_data->tb_update_count;
229 extern struct timezone sys_tz;
231 void update_vsyscall_tz(void)
233 /* Make userspace gettimeofday spin until we're done. */
234 ++vdso_data->tb_update_count;
236 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
237 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
239 ++vdso_data->tb_update_count;
243 * Initialize the TOD clock and the CPU timer of
246 void __init time_init(void)
248 /* Reset time synchronization interfaces. */
252 /* request the clock comparator external interrupt */
253 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
254 panic("Couldn't request external interrupt 0x1004");
256 /* request the timing alert external interrupt */
257 if (register_external_interrupt(0x1406, timing_alert_interrupt))
258 panic("Couldn't request external interrupt 0x1406");
260 if (clocksource_register(&clocksource_tod) != 0)
261 panic("Could not register TOD clock source");
263 /* Enable TOD clock interrupts on the boot cpu. */
266 /* Enable cpu timer interrupts on the boot cpu. */
271 * The time is "clock". old is what we think the time is.
272 * Adjust the value by a multiple of jiffies and add the delta to ntp.
273 * "delay" is an approximation how long the synchronization took. If
274 * the time correction is positive, then "delay" is subtracted from
275 * the time difference and only the remaining part is passed to ntp.
277 static unsigned long long adjust_time(unsigned long long old,
278 unsigned long long clock,
279 unsigned long long delay)
281 unsigned long long delta, ticks;
285 /* It is later than we thought. */
286 delta = ticks = clock - old;
287 delta = ticks = (delta < delay) ? 0 : delta - delay;
288 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
289 adjust.offset = ticks * (1000000 / HZ);
291 /* It is earlier than we thought. */
292 delta = ticks = old - clock;
293 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
295 adjust.offset = -ticks * (1000000 / HZ);
297 sched_clock_base_cc += delta;
298 if (adjust.offset != 0) {
299 pr_notice("The ETR interface has adjusted the clock "
300 "by %li microseconds\n", adjust.offset);
301 adjust.modes = ADJ_OFFSET_SINGLESHOT;
302 do_adjtimex(&adjust);
307 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
308 static DEFINE_MUTEX(clock_sync_mutex);
309 static unsigned long clock_sync_flags;
311 #define CLOCK_SYNC_HAS_ETR 0
312 #define CLOCK_SYNC_HAS_STP 1
313 #define CLOCK_SYNC_ETR 2
314 #define CLOCK_SYNC_STP 3
317 * The synchronous get_clock function. It will write the current clock
318 * value to the clock pointer and return 0 if the clock is in sync with
319 * the external time source. If the clock mode is local it will return
320 * -ENOSYS and -EAGAIN if the clock is not in sync with the external
323 int get_sync_clock(unsigned long long *clock)
326 unsigned int sw0, sw1;
328 sw_ptr = &get_cpu_var(clock_sync_word);
329 sw0 = atomic_read(sw_ptr);
330 *clock = get_clock();
331 sw1 = atomic_read(sw_ptr);
332 put_cpu_var(clock_sync_word);
333 if (sw0 == sw1 && (sw0 & 0x80000000U))
334 /* Success: time is in sync. */
336 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
337 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
339 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
340 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
344 EXPORT_SYMBOL(get_sync_clock);
347 * Make get_sync_clock return -EAGAIN.
349 static void disable_sync_clock(void *dummy)
351 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
353 * Clear the in-sync bit 2^31. All get_sync_clock calls will
354 * fail until the sync bit is turned back on. In addition
355 * increase the "sequence" counter to avoid the race of an
356 * etr event and the complete recovery against get_sync_clock.
358 atomic_clear_mask(0x80000000, sw_ptr);
363 * Make get_sync_clock return 0 again.
364 * Needs to be called from a context disabled for preemption.
366 static void enable_sync_clock(void)
368 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
369 atomic_set_mask(0x80000000, sw_ptr);
373 * Function to check if the clock is in sync.
375 static inline int check_sync_clock(void)
380 sw_ptr = &get_cpu_var(clock_sync_word);
381 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
382 put_cpu_var(clock_sync_word);
386 /* Single threaded workqueue used for etr and stp sync events */
387 static struct workqueue_struct *time_sync_wq;
389 static void __init time_init_wq(void)
393 time_sync_wq = create_singlethread_workqueue("timesync");
397 * External Time Reference (ETR) code.
399 static int etr_port0_online;
400 static int etr_port1_online;
401 static int etr_steai_available;
403 static int __init early_parse_etr(char *p)
405 if (strncmp(p, "off", 3) == 0)
406 etr_port0_online = etr_port1_online = 0;
407 else if (strncmp(p, "port0", 5) == 0)
408 etr_port0_online = 1;
409 else if (strncmp(p, "port1", 5) == 0)
410 etr_port1_online = 1;
411 else if (strncmp(p, "on", 2) == 0)
412 etr_port0_online = etr_port1_online = 1;
415 early_param("etr", early_parse_etr);
418 ETR_EVENT_PORT0_CHANGE,
419 ETR_EVENT_PORT1_CHANGE,
420 ETR_EVENT_PORT_ALERT,
421 ETR_EVENT_SYNC_CHECK,
422 ETR_EVENT_SWITCH_LOCAL,
427 * Valid bit combinations of the eacr register are (x = don't care):
428 * e0 e1 dp p0 p1 ea es sl
429 * 0 0 x 0 0 0 0 0 initial, disabled state
430 * 0 0 x 0 1 1 0 0 port 1 online
431 * 0 0 x 1 0 1 0 0 port 0 online
432 * 0 0 x 1 1 1 0 0 both ports online
433 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
434 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
435 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
436 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
437 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
438 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
439 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
440 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
441 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
442 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
443 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
444 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
445 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
446 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
447 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
448 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
450 static struct etr_eacr etr_eacr;
451 static u64 etr_tolec; /* time of last eacr update */
452 static struct etr_aib etr_port0;
453 static int etr_port0_uptodate;
454 static struct etr_aib etr_port1;
455 static int etr_port1_uptodate;
456 static unsigned long etr_events;
457 static struct timer_list etr_timer;
459 static void etr_timeout(unsigned long dummy);
460 static void etr_work_fn(struct work_struct *work);
461 static DEFINE_MUTEX(etr_work_mutex);
462 static DECLARE_WORK(etr_work, etr_work_fn);
465 * Reset ETR attachment.
467 static void etr_reset(void)
469 etr_eacr = (struct etr_eacr) {
470 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
471 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
473 if (etr_setr(&etr_eacr) == 0) {
474 etr_tolec = get_clock();
475 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
476 if (etr_port0_online && etr_port1_online)
477 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
478 } else if (etr_port0_online || etr_port1_online) {
479 pr_warning("The real or virtual hardware system does "
480 "not provide an ETR interface\n");
481 etr_port0_online = etr_port1_online = 0;
485 static int __init etr_init(void)
489 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
492 /* Check if this machine has the steai instruction. */
493 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
494 etr_steai_available = 1;
495 setup_timer(&etr_timer, etr_timeout, 0UL);
496 if (etr_port0_online) {
497 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
498 queue_work(time_sync_wq, &etr_work);
500 if (etr_port1_online) {
501 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
502 queue_work(time_sync_wq, &etr_work);
507 arch_initcall(etr_init);
510 * Two sorts of ETR machine checks. The architecture reads:
511 * "When a machine-check niterruption occurs and if a switch-to-local or
512 * ETR-sync-check interrupt request is pending but disabled, this pending
513 * disabled interruption request is indicated and is cleared".
514 * Which means that we can get etr_switch_to_local events from the machine
515 * check handler although the interruption condition is disabled. Lovely..
519 * Switch to local machine check. This is called when the last usable
520 * ETR port goes inactive. After switch to local the clock is not in sync.
522 void etr_switch_to_local(void)
526 disable_sync_clock(NULL);
527 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
528 queue_work(time_sync_wq, &etr_work);
532 * ETR sync check machine check. This is called when the ETR OTE and the
533 * local clock OTE are farther apart than the ETR sync check tolerance.
534 * After a ETR sync check the clock is not in sync. The machine check
535 * is broadcasted to all cpus at the same time.
537 void etr_sync_check(void)
541 disable_sync_clock(NULL);
542 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
543 queue_work(time_sync_wq, &etr_work);
547 * ETR timing alert. There are two causes:
548 * 1) port state change, check the usability of the port
549 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
550 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
551 * or ETR-data word 4 (edf4) has changed.
553 static void etr_timing_alert(struct etr_irq_parm *intparm)
556 /* ETR port 0 state change. */
557 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
559 /* ETR port 1 state change. */
560 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
563 * ETR port alert on either port 0, 1 or both.
564 * Both ports are not up-to-date now.
566 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
567 queue_work(time_sync_wq, &etr_work);
570 static void etr_timeout(unsigned long dummy)
572 set_bit(ETR_EVENT_UPDATE, &etr_events);
573 queue_work(time_sync_wq, &etr_work);
577 * Check if the etr mode is pss.
579 static inline int etr_mode_is_pps(struct etr_eacr eacr)
581 return eacr.es && !eacr.sl;
585 * Check if the etr mode is etr.
587 static inline int etr_mode_is_etr(struct etr_eacr eacr)
589 return eacr.es && eacr.sl;
593 * Check if the port can be used for TOD synchronization.
594 * For PPS mode the port has to receive OTEs. For ETR mode
595 * the port has to receive OTEs, the ETR stepping bit has to
596 * be zero and the validity bits for data frame 1, 2, and 3
599 static int etr_port_valid(struct etr_aib *aib, int port)
603 /* Check that this port is receiving OTEs. */
607 psc = port ? aib->esw.psc1 : aib->esw.psc0;
608 if (psc == etr_lpsc_pps_mode)
610 if (psc == etr_lpsc_operational_step)
611 return !aib->esw.y && aib->slsw.v1 &&
612 aib->slsw.v2 && aib->slsw.v3;
617 * Check if two ports are on the same network.
619 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
621 // FIXME: any other fields we have to compare?
622 return aib1->edf1.net_id == aib2->edf1.net_id;
626 * Wrapper for etr_stei that converts physical port states
627 * to logical port states to be consistent with the output
628 * of stetr (see etr_psc vs. etr_lpsc).
630 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
632 BUG_ON(etr_steai(aib, func) != 0);
633 /* Convert port state to logical port state. */
634 if (aib->esw.psc0 == 1)
636 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
638 if (aib->esw.psc1 == 1)
640 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
645 * Check if the aib a2 is still connected to the same attachment as
646 * aib a1, the etv values differ by one and a2 is valid.
648 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
650 int state_a1, state_a2;
652 /* Paranoia check: e0/e1 should better be the same. */
653 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
654 a1->esw.eacr.e1 != a2->esw.eacr.e1)
657 /* Still connected to the same etr ? */
658 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
659 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
660 if (state_a1 == etr_lpsc_operational_step) {
661 if (state_a2 != etr_lpsc_operational_step ||
662 a1->edf1.net_id != a2->edf1.net_id ||
663 a1->edf1.etr_id != a2->edf1.etr_id ||
664 a1->edf1.etr_pn != a2->edf1.etr_pn)
666 } else if (state_a2 != etr_lpsc_pps_mode)
669 /* The ETV value of a2 needs to be ETV of a1 + 1. */
670 if (a1->edf2.etv + 1 != a2->edf2.etv)
673 if (!etr_port_valid(a2, p))
679 struct clock_sync_data {
682 unsigned long long fixup_cc;
684 struct etr_aib *etr_aib;
687 static void clock_sync_cpu(struct clock_sync_data *sync)
689 atomic_dec(&sync->cpus);
692 * This looks like a busy wait loop but it isn't. etr_sync_cpus
693 * is called on all other cpus while the TOD clocks is stopped.
694 * __udelay will stop the cpu on an enabled wait psw until the
695 * TOD is running again.
697 while (sync->in_sync == 0) {
700 * A different cpu changes *in_sync. Therefore use
701 * barrier() to force memory access.
705 if (sync->in_sync != 1)
706 /* Didn't work. Clear per-cpu in sync bit again. */
707 disable_sync_clock(NULL);
709 * This round of TOD syncing is done. Set the clock comparator
710 * to the next tick and let the processor continue.
712 fixup_clock_comparator(sync->fixup_cc);
716 * Sync the TOD clock using the port refered to by aibp. This port
717 * has to be enabled and the other port has to be disabled. The
718 * last eacr update has to be more than 1.6 seconds in the past.
720 static int etr_sync_clock(void *data)
723 unsigned long long clock, old_clock, delay, delta;
724 struct clock_sync_data *etr_sync;
725 struct etr_aib *sync_port, *aib;
731 if (xchg(&first, 1) == 1) {
733 clock_sync_cpu(etr_sync);
737 /* Wait until all other cpus entered the sync function. */
738 while (atomic_read(&etr_sync->cpus) != 0)
741 port = etr_sync->etr_port;
742 aib = etr_sync->etr_aib;
743 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
746 /* Set clock to next OTE. */
747 __ctl_set_bit(14, 21);
748 __ctl_set_bit(0, 29);
749 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
750 old_clock = get_clock();
751 if (set_clock(clock) == 0) {
752 __udelay(1); /* Wait for the clock to start. */
753 __ctl_clear_bit(0, 29);
754 __ctl_clear_bit(14, 21);
756 /* Adjust Linux timing variables. */
757 delay = (unsigned long long)
758 (aib->edf2.etv - sync_port->edf2.etv) << 32;
759 delta = adjust_time(old_clock, clock, delay);
760 etr_sync->fixup_cc = delta;
761 fixup_clock_comparator(delta);
762 /* Verify that the clock is properly set. */
763 if (!etr_aib_follows(sync_port, aib, port)) {
765 disable_sync_clock(NULL);
766 etr_sync->in_sync = -EAGAIN;
769 etr_sync->in_sync = 1;
773 /* Could not set the clock ?!? */
774 __ctl_clear_bit(0, 29);
775 __ctl_clear_bit(14, 21);
776 disable_sync_clock(NULL);
777 etr_sync->in_sync = -EAGAIN;
784 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
786 struct clock_sync_data etr_sync;
787 struct etr_aib *sync_port;
791 /* Check if the current aib is adjacent to the sync port aib. */
792 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
793 follows = etr_aib_follows(sync_port, aib, port);
794 memcpy(sync_port, aib, sizeof(*aib));
797 memset(&etr_sync, 0, sizeof(etr_sync));
798 etr_sync.etr_aib = aib;
799 etr_sync.etr_port = port;
801 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
802 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
808 * Handle the immediate effects of the different events.
809 * The port change event is used for online/offline changes.
811 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
813 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
815 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
816 eacr.es = eacr.sl = 0;
817 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
818 etr_port0_uptodate = etr_port1_uptodate = 0;
820 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
823 * Port change of an enabled port. We have to
824 * assume that this can have caused an stepping
827 etr_tolec = get_clock();
828 eacr.p0 = etr_port0_online;
831 etr_port0_uptodate = 0;
833 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
836 * Port change of an enabled port. We have to
837 * assume that this can have caused an stepping
840 etr_tolec = get_clock();
841 eacr.p1 = etr_port1_online;
844 etr_port1_uptodate = 0;
846 clear_bit(ETR_EVENT_UPDATE, &etr_events);
851 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
852 * one of the ports needs an update.
854 static void etr_set_tolec_timeout(unsigned long long now)
856 unsigned long micros;
858 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
859 (!etr_eacr.p1 || etr_port1_uptodate))
861 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
862 micros = (micros > 1600000) ? 0 : 1600000 - micros;
863 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
867 * Set up a time that expires after 1/2 second.
869 static void etr_set_sync_timeout(void)
871 mod_timer(&etr_timer, jiffies + HZ/2);
875 * Update the aib information for one or both ports.
877 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
878 struct etr_eacr eacr)
880 /* With both ports disabled the aib information is useless. */
881 if (!eacr.e0 && !eacr.e1)
884 /* Update port0 or port1 with aib stored in etr_work_fn. */
885 if (aib->esw.q == 0) {
886 /* Information for port 0 stored. */
887 if (eacr.p0 && !etr_port0_uptodate) {
889 if (etr_port0_online)
890 etr_port0_uptodate = 1;
893 /* Information for port 1 stored. */
894 if (eacr.p1 && !etr_port1_uptodate) {
896 if (etr_port0_online)
897 etr_port1_uptodate = 1;
902 * Do not try to get the alternate port aib if the clock
903 * is not in sync yet.
905 if (!check_sync_clock())
909 * If steai is available we can get the information about
910 * the other port immediately. If only stetr is available the
911 * data-port bit toggle has to be used.
913 if (etr_steai_available) {
914 if (eacr.p0 && !etr_port0_uptodate) {
915 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
916 etr_port0_uptodate = 1;
918 if (eacr.p1 && !etr_port1_uptodate) {
919 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
920 etr_port1_uptodate = 1;
924 * One port was updated above, if the other
925 * port is not uptodate toggle dp bit.
927 if ((eacr.p0 && !etr_port0_uptodate) ||
928 (eacr.p1 && !etr_port1_uptodate))
937 * Write new etr control register if it differs from the current one.
938 * Return 1 if etr_tolec has been updated as well.
940 static void etr_update_eacr(struct etr_eacr eacr)
944 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
945 /* No change, return. */
948 * The disable of an active port of the change of the data port
949 * bit can/will cause a change in the data port.
951 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
952 (etr_eacr.dp ^ eacr.dp) != 0;
956 etr_tolec = get_clock();
960 * ETR work. In this function you'll find the main logic. In
961 * particular this is the only function that calls etr_update_eacr(),
962 * it "controls" the etr control register.
964 static void etr_work_fn(struct work_struct *work)
966 unsigned long long now;
967 struct etr_eacr eacr;
971 /* prevent multiple execution. */
972 mutex_lock(&etr_work_mutex);
974 /* Create working copy of etr_eacr. */
977 /* Check for the different events and their immediate effects. */
978 eacr = etr_handle_events(eacr);
980 /* Check if ETR is supposed to be active. */
981 eacr.ea = eacr.p0 || eacr.p1;
983 /* Both ports offline. Reset everything. */
984 eacr.dp = eacr.es = eacr.sl = 0;
985 on_each_cpu(disable_sync_clock, NULL, 1);
986 del_timer_sync(&etr_timer);
987 etr_update_eacr(eacr);
991 /* Store aib to get the current ETR status word. */
992 BUG_ON(etr_stetr(&aib) != 0);
993 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
997 * Update the port information if the last stepping port change
998 * or data port change is older than 1.6 seconds.
1000 if (now >= etr_tolec + (1600000 << 12))
1001 eacr = etr_handle_update(&aib, eacr);
1004 * Select ports to enable. The prefered synchronization mode is PPS.
1005 * If a port can be enabled depends on a number of things:
1006 * 1) The port needs to be online and uptodate. A port is not
1007 * disabled just because it is not uptodate, but it is only
1008 * enabled if it is uptodate.
1009 * 2) The port needs to have the same mode (pps / etr).
1010 * 3) The port needs to be usable -> etr_port_valid() == 1
1011 * 4) To enable the second port the clock needs to be in sync.
1012 * 5) If both ports are useable and are ETR ports, the network id
1013 * has to be the same.
1014 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1016 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1019 if (!etr_mode_is_pps(etr_eacr))
1021 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1023 // FIXME: uptodate checks ?
1024 else if (etr_port0_uptodate && etr_port1_uptodate)
1026 sync_port = (etr_port0_uptodate &&
1027 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1028 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1032 if (!etr_mode_is_pps(etr_eacr))
1034 sync_port = (etr_port1_uptodate &&
1035 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1036 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1039 if (!etr_mode_is_etr(etr_eacr))
1041 if (!eacr.es || !eacr.p1 ||
1042 aib.esw.psc1 != etr_lpsc_operational_alt)
1044 else if (etr_port0_uptodate && etr_port1_uptodate &&
1045 etr_compare_network(&etr_port0, &etr_port1))
1047 sync_port = (etr_port0_uptodate &&
1048 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1049 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1053 if (!etr_mode_is_etr(etr_eacr))
1055 sync_port = (etr_port1_uptodate &&
1056 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1058 /* Both ports not usable. */
1059 eacr.es = eacr.sl = 0;
1064 * If the clock is in sync just update the eacr and return.
1065 * If there is no valid sync port wait for a port update.
1067 if (check_sync_clock() || sync_port < 0) {
1068 etr_update_eacr(eacr);
1069 etr_set_tolec_timeout(now);
1074 * Prepare control register for clock syncing
1075 * (reset data port bit, set sync check control.
1081 * Update eacr and try to synchronize the clock. If the update
1082 * of eacr caused a stepping port switch (or if we have to
1083 * assume that a stepping port switch has occured) or the
1084 * clock syncing failed, reset the sync check control bit
1085 * and set up a timer to try again after 0.5 seconds
1087 etr_update_eacr(eacr);
1088 if (now < etr_tolec + (1600000 << 12) ||
1089 etr_sync_clock_stop(&aib, sync_port) != 0) {
1090 /* Sync failed. Try again in 1/2 second. */
1092 etr_update_eacr(eacr);
1093 etr_set_sync_timeout();
1095 etr_set_tolec_timeout(now);
1097 mutex_unlock(&etr_work_mutex);
1101 * Sysfs interface functions
1103 static struct sysdev_class etr_sysclass = {
1107 static struct sys_device etr_port0_dev = {
1109 .cls = &etr_sysclass,
1112 static struct sys_device etr_port1_dev = {
1114 .cls = &etr_sysclass,
1118 * ETR class attributes
1120 static ssize_t etr_stepping_port_show(struct sysdev_class *class,
1121 struct sysdev_class_attribute *attr,
1124 return sprintf(buf, "%i\n", etr_port0.esw.p);
1127 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1129 static ssize_t etr_stepping_mode_show(struct sysdev_class *class,
1130 struct sysdev_class_attribute *attr,
1135 if (etr_mode_is_pps(etr_eacr))
1137 else if (etr_mode_is_etr(etr_eacr))
1141 return sprintf(buf, "%s\n", mode_str);
1144 static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1147 * ETR port attributes
1149 static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1151 if (dev == &etr_port0_dev)
1152 return etr_port0_online ? &etr_port0 : NULL;
1154 return etr_port1_online ? &etr_port1 : NULL;
1157 static ssize_t etr_online_show(struct sys_device *dev,
1158 struct sysdev_attribute *attr,
1161 unsigned int online;
1163 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1164 return sprintf(buf, "%i\n", online);
1167 static ssize_t etr_online_store(struct sys_device *dev,
1168 struct sysdev_attribute *attr,
1169 const char *buf, size_t count)
1173 value = simple_strtoul(buf, NULL, 0);
1174 if (value != 0 && value != 1)
1176 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1178 mutex_lock(&clock_sync_mutex);
1179 if (dev == &etr_port0_dev) {
1180 if (etr_port0_online == value)
1181 goto out; /* Nothing to do. */
1182 etr_port0_online = value;
1183 if (etr_port0_online && etr_port1_online)
1184 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1186 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1187 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1188 queue_work(time_sync_wq, &etr_work);
1190 if (etr_port1_online == value)
1191 goto out; /* Nothing to do. */
1192 etr_port1_online = value;
1193 if (etr_port0_online && etr_port1_online)
1194 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1196 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1197 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1198 queue_work(time_sync_wq, &etr_work);
1201 mutex_unlock(&clock_sync_mutex);
1205 static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1207 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1208 struct sysdev_attribute *attr,
1211 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1212 etr_eacr.e0 : etr_eacr.e1);
1215 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1217 static ssize_t etr_mode_code_show(struct sys_device *dev,
1218 struct sysdev_attribute *attr, char *buf)
1220 if (!etr_port0_online && !etr_port1_online)
1221 /* Status word is not uptodate if both ports are offline. */
1223 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1224 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1227 static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1229 static ssize_t etr_untuned_show(struct sys_device *dev,
1230 struct sysdev_attribute *attr, char *buf)
1232 struct etr_aib *aib = etr_aib_from_dev(dev);
1234 if (!aib || !aib->slsw.v1)
1236 return sprintf(buf, "%i\n", aib->edf1.u);
1239 static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1241 static ssize_t etr_network_id_show(struct sys_device *dev,
1242 struct sysdev_attribute *attr, char *buf)
1244 struct etr_aib *aib = etr_aib_from_dev(dev);
1246 if (!aib || !aib->slsw.v1)
1248 return sprintf(buf, "%i\n", aib->edf1.net_id);
1251 static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1253 static ssize_t etr_id_show(struct sys_device *dev,
1254 struct sysdev_attribute *attr, char *buf)
1256 struct etr_aib *aib = etr_aib_from_dev(dev);
1258 if (!aib || !aib->slsw.v1)
1260 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1263 static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1265 static ssize_t etr_port_number_show(struct sys_device *dev,
1266 struct sysdev_attribute *attr, char *buf)
1268 struct etr_aib *aib = etr_aib_from_dev(dev);
1270 if (!aib || !aib->slsw.v1)
1272 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1275 static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1277 static ssize_t etr_coupled_show(struct sys_device *dev,
1278 struct sysdev_attribute *attr, char *buf)
1280 struct etr_aib *aib = etr_aib_from_dev(dev);
1282 if (!aib || !aib->slsw.v3)
1284 return sprintf(buf, "%i\n", aib->edf3.c);
1287 static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1289 static ssize_t etr_local_time_show(struct sys_device *dev,
1290 struct sysdev_attribute *attr, char *buf)
1292 struct etr_aib *aib = etr_aib_from_dev(dev);
1294 if (!aib || !aib->slsw.v3)
1296 return sprintf(buf, "%i\n", aib->edf3.blto);
1299 static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1301 static ssize_t etr_utc_offset_show(struct sys_device *dev,
1302 struct sysdev_attribute *attr, char *buf)
1304 struct etr_aib *aib = etr_aib_from_dev(dev);
1306 if (!aib || !aib->slsw.v3)
1308 return sprintf(buf, "%i\n", aib->edf3.buo);
1311 static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1313 static struct sysdev_attribute *etr_port_attributes[] = {
1315 &attr_stepping_control,
1327 static int __init etr_register_port(struct sys_device *dev)
1329 struct sysdev_attribute **attr;
1332 rc = sysdev_register(dev);
1335 for (attr = etr_port_attributes; *attr; attr++) {
1336 rc = sysdev_create_file(dev, *attr);
1342 for (; attr >= etr_port_attributes; attr--)
1343 sysdev_remove_file(dev, *attr);
1344 sysdev_unregister(dev);
1349 static void __init etr_unregister_port(struct sys_device *dev)
1351 struct sysdev_attribute **attr;
1353 for (attr = etr_port_attributes; *attr; attr++)
1354 sysdev_remove_file(dev, *attr);
1355 sysdev_unregister(dev);
1358 static int __init etr_init_sysfs(void)
1362 rc = sysdev_class_register(&etr_sysclass);
1365 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1367 goto out_unreg_class;
1368 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1370 goto out_remove_stepping_port;
1371 rc = etr_register_port(&etr_port0_dev);
1373 goto out_remove_stepping_mode;
1374 rc = etr_register_port(&etr_port1_dev);
1376 goto out_remove_port0;
1380 etr_unregister_port(&etr_port0_dev);
1381 out_remove_stepping_mode:
1382 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1383 out_remove_stepping_port:
1384 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1386 sysdev_class_unregister(&etr_sysclass);
1391 device_initcall(etr_init_sysfs);
1394 * Server Time Protocol (STP) code.
1396 static int stp_online;
1397 static struct stp_sstpi stp_info;
1398 static void *stp_page;
1400 static void stp_work_fn(struct work_struct *work);
1401 static DEFINE_MUTEX(stp_work_mutex);
1402 static DECLARE_WORK(stp_work, stp_work_fn);
1403 static struct timer_list stp_timer;
1405 static int __init early_parse_stp(char *p)
1407 if (strncmp(p, "off", 3) == 0)
1409 else if (strncmp(p, "on", 2) == 0)
1413 early_param("stp", early_parse_stp);
1416 * Reset STP attachment.
1418 static void __init stp_reset(void)
1422 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1423 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1425 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1426 else if (stp_online) {
1427 pr_warning("The real or virtual hardware system does "
1428 "not provide an STP interface\n");
1429 free_page((unsigned long) stp_page);
1435 static void stp_timeout(unsigned long dummy)
1437 queue_work(time_sync_wq, &stp_work);
1440 static int __init stp_init(void)
1442 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1444 setup_timer(&stp_timer, stp_timeout, 0UL);
1448 queue_work(time_sync_wq, &stp_work);
1452 arch_initcall(stp_init);
1455 * STP timing alert. There are three causes:
1456 * 1) timing status change
1457 * 2) link availability change
1458 * 3) time control parameter change
1459 * In all three cases we are only interested in the clock source state.
1460 * If a STP clock source is now available use it.
1462 static void stp_timing_alert(struct stp_irq_parm *intparm)
1464 if (intparm->tsc || intparm->lac || intparm->tcpc)
1465 queue_work(time_sync_wq, &stp_work);
1469 * STP sync check machine check. This is called when the timing state
1470 * changes from the synchronized state to the unsynchronized state.
1471 * After a STP sync check the clock is not in sync. The machine check
1472 * is broadcasted to all cpus at the same time.
1474 void stp_sync_check(void)
1476 disable_sync_clock(NULL);
1477 queue_work(time_sync_wq, &stp_work);
1481 * STP island condition machine check. This is called when an attached
1482 * server attempts to communicate over an STP link and the servers
1483 * have matching CTN ids and have a valid stratum-1 configuration
1484 * but the configurations do not match.
1486 void stp_island_check(void)
1488 disable_sync_clock(NULL);
1489 queue_work(time_sync_wq, &stp_work);
1493 static int stp_sync_clock(void *data)
1496 unsigned long long old_clock, delta;
1497 struct clock_sync_data *stp_sync;
1502 if (xchg(&first, 1) == 1) {
1504 clock_sync_cpu(stp_sync);
1508 /* Wait until all other cpus entered the sync function. */
1509 while (atomic_read(&stp_sync->cpus) != 0)
1512 enable_sync_clock();
1515 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1516 stp_info.todoff[2] || stp_info.todoff[3] ||
1517 stp_info.tmd != 2) {
1518 old_clock = get_clock();
1519 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1521 delta = adjust_time(old_clock, get_clock(), 0);
1522 fixup_clock_comparator(delta);
1523 rc = chsc_sstpi(stp_page, &stp_info,
1524 sizeof(struct stp_sstpi));
1525 if (rc == 0 && stp_info.tmd != 2)
1530 disable_sync_clock(NULL);
1531 stp_sync->in_sync = -EAGAIN;
1533 stp_sync->in_sync = 1;
1539 * STP work. Check for the STP state and take over the clock
1540 * synchronization if the STP clock source is usable.
1542 static void stp_work_fn(struct work_struct *work)
1544 struct clock_sync_data stp_sync;
1547 /* prevent multiple execution. */
1548 mutex_lock(&stp_work_mutex);
1551 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1552 del_timer_sync(&stp_timer);
1556 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1560 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1561 if (rc || stp_info.c == 0)
1564 /* Skip synchronization if the clock is already in sync. */
1565 if (check_sync_clock())
1568 memset(&stp_sync, 0, sizeof(stp_sync));
1570 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1571 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1574 if (!check_sync_clock())
1576 * There is a usable clock but the synchonization failed.
1577 * Retry after a second.
1579 mod_timer(&stp_timer, jiffies + HZ);
1582 mutex_unlock(&stp_work_mutex);
1586 * STP class sysfs interface functions
1588 static struct sysdev_class stp_sysclass = {
1592 static ssize_t stp_ctn_id_show(struct sysdev_class *class,
1593 struct sysdev_class_attribute *attr,
1598 return sprintf(buf, "%016llx\n",
1599 *(unsigned long long *) stp_info.ctnid);
1602 static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1604 static ssize_t stp_ctn_type_show(struct sysdev_class *class,
1605 struct sysdev_class_attribute *attr,
1610 return sprintf(buf, "%i\n", stp_info.ctn);
1613 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1615 static ssize_t stp_dst_offset_show(struct sysdev_class *class,
1616 struct sysdev_class_attribute *attr,
1619 if (!stp_online || !(stp_info.vbits & 0x2000))
1621 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1624 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1626 static ssize_t stp_leap_seconds_show(struct sysdev_class *class,
1627 struct sysdev_class_attribute *attr,
1630 if (!stp_online || !(stp_info.vbits & 0x8000))
1632 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1635 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1637 static ssize_t stp_stratum_show(struct sysdev_class *class,
1638 struct sysdev_class_attribute *attr,
1643 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1646 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1648 static ssize_t stp_time_offset_show(struct sysdev_class *class,
1649 struct sysdev_class_attribute *attr,
1652 if (!stp_online || !(stp_info.vbits & 0x0800))
1654 return sprintf(buf, "%i\n", (int) stp_info.tto);
1657 static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1659 static ssize_t stp_time_zone_offset_show(struct sysdev_class *class,
1660 struct sysdev_class_attribute *attr,
1663 if (!stp_online || !(stp_info.vbits & 0x4000))
1665 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1668 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1669 stp_time_zone_offset_show, NULL);
1671 static ssize_t stp_timing_mode_show(struct sysdev_class *class,
1672 struct sysdev_class_attribute *attr,
1677 return sprintf(buf, "%i\n", stp_info.tmd);
1680 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1682 static ssize_t stp_timing_state_show(struct sysdev_class *class,
1683 struct sysdev_class_attribute *attr,
1688 return sprintf(buf, "%i\n", stp_info.tst);
1691 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1693 static ssize_t stp_online_show(struct sysdev_class *class,
1694 struct sysdev_class_attribute *attr,
1697 return sprintf(buf, "%i\n", stp_online);
1700 static ssize_t stp_online_store(struct sysdev_class *class,
1701 struct sysdev_class_attribute *attr,
1702 const char *buf, size_t count)
1706 value = simple_strtoul(buf, NULL, 0);
1707 if (value != 0 && value != 1)
1709 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1711 mutex_lock(&clock_sync_mutex);
1714 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1716 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1717 queue_work(time_sync_wq, &stp_work);
1718 mutex_unlock(&clock_sync_mutex);
1723 * Can't use SYSDEV_CLASS_ATTR because the attribute should be named
1724 * stp/online but attr_online already exists in this file ..
1726 static struct sysdev_class_attribute attr_stp_online = {
1727 .attr = { .name = "online", .mode = 0600 },
1728 .show = stp_online_show,
1729 .store = stp_online_store,
1732 static struct sysdev_class_attribute *stp_attributes[] = {
1740 &attr_time_zone_offset,
1746 static int __init stp_init_sysfs(void)
1748 struct sysdev_class_attribute **attr;
1751 rc = sysdev_class_register(&stp_sysclass);
1754 for (attr = stp_attributes; *attr; attr++) {
1755 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1761 for (; attr >= stp_attributes; attr--)
1762 sysdev_class_remove_file(&stp_sysclass, *attr);
1763 sysdev_class_unregister(&stp_sysclass);
1768 device_initcall(stp_init_sysfs);