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");
394 stop_machine_create();
398 * External Time Reference (ETR) code.
400 static int etr_port0_online;
401 static int etr_port1_online;
402 static int etr_steai_available;
404 static int __init early_parse_etr(char *p)
406 if (strncmp(p, "off", 3) == 0)
407 etr_port0_online = etr_port1_online = 0;
408 else if (strncmp(p, "port0", 5) == 0)
409 etr_port0_online = 1;
410 else if (strncmp(p, "port1", 5) == 0)
411 etr_port1_online = 1;
412 else if (strncmp(p, "on", 2) == 0)
413 etr_port0_online = etr_port1_online = 1;
416 early_param("etr", early_parse_etr);
419 ETR_EVENT_PORT0_CHANGE,
420 ETR_EVENT_PORT1_CHANGE,
421 ETR_EVENT_PORT_ALERT,
422 ETR_EVENT_SYNC_CHECK,
423 ETR_EVENT_SWITCH_LOCAL,
428 * Valid bit combinations of the eacr register are (x = don't care):
429 * e0 e1 dp p0 p1 ea es sl
430 * 0 0 x 0 0 0 0 0 initial, disabled state
431 * 0 0 x 0 1 1 0 0 port 1 online
432 * 0 0 x 1 0 1 0 0 port 0 online
433 * 0 0 x 1 1 1 0 0 both ports online
434 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
435 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
436 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
437 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
438 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
439 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
440 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
441 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
442 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
443 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
444 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
445 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
446 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
447 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
448 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
449 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
451 static struct etr_eacr etr_eacr;
452 static u64 etr_tolec; /* time of last eacr update */
453 static struct etr_aib etr_port0;
454 static int etr_port0_uptodate;
455 static struct etr_aib etr_port1;
456 static int etr_port1_uptodate;
457 static unsigned long etr_events;
458 static struct timer_list etr_timer;
460 static void etr_timeout(unsigned long dummy);
461 static void etr_work_fn(struct work_struct *work);
462 static DEFINE_MUTEX(etr_work_mutex);
463 static DECLARE_WORK(etr_work, etr_work_fn);
466 * Reset ETR attachment.
468 static void etr_reset(void)
470 etr_eacr = (struct etr_eacr) {
471 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
472 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
474 if (etr_setr(&etr_eacr) == 0) {
475 etr_tolec = get_clock();
476 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
477 if (etr_port0_online && etr_port1_online)
478 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
479 } else if (etr_port0_online || etr_port1_online) {
480 pr_warning("The real or virtual hardware system does "
481 "not provide an ETR interface\n");
482 etr_port0_online = etr_port1_online = 0;
486 static int __init etr_init(void)
490 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
493 /* Check if this machine has the steai instruction. */
494 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
495 etr_steai_available = 1;
496 setup_timer(&etr_timer, etr_timeout, 0UL);
497 if (etr_port0_online) {
498 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
499 queue_work(time_sync_wq, &etr_work);
501 if (etr_port1_online) {
502 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
503 queue_work(time_sync_wq, &etr_work);
508 arch_initcall(etr_init);
511 * Two sorts of ETR machine checks. The architecture reads:
512 * "When a machine-check niterruption occurs and if a switch-to-local or
513 * ETR-sync-check interrupt request is pending but disabled, this pending
514 * disabled interruption request is indicated and is cleared".
515 * Which means that we can get etr_switch_to_local events from the machine
516 * check handler although the interruption condition is disabled. Lovely..
520 * Switch to local machine check. This is called when the last usable
521 * ETR port goes inactive. After switch to local the clock is not in sync.
523 void etr_switch_to_local(void)
527 disable_sync_clock(NULL);
528 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
529 queue_work(time_sync_wq, &etr_work);
533 * ETR sync check machine check. This is called when the ETR OTE and the
534 * local clock OTE are farther apart than the ETR sync check tolerance.
535 * After a ETR sync check the clock is not in sync. The machine check
536 * is broadcasted to all cpus at the same time.
538 void etr_sync_check(void)
542 disable_sync_clock(NULL);
543 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
544 queue_work(time_sync_wq, &etr_work);
548 * ETR timing alert. There are two causes:
549 * 1) port state change, check the usability of the port
550 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
551 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
552 * or ETR-data word 4 (edf4) has changed.
554 static void etr_timing_alert(struct etr_irq_parm *intparm)
557 /* ETR port 0 state change. */
558 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
560 /* ETR port 1 state change. */
561 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
564 * ETR port alert on either port 0, 1 or both.
565 * Both ports are not up-to-date now.
567 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
568 queue_work(time_sync_wq, &etr_work);
571 static void etr_timeout(unsigned long dummy)
573 set_bit(ETR_EVENT_UPDATE, &etr_events);
574 queue_work(time_sync_wq, &etr_work);
578 * Check if the etr mode is pss.
580 static inline int etr_mode_is_pps(struct etr_eacr eacr)
582 return eacr.es && !eacr.sl;
586 * Check if the etr mode is etr.
588 static inline int etr_mode_is_etr(struct etr_eacr eacr)
590 return eacr.es && eacr.sl;
594 * Check if the port can be used for TOD synchronization.
595 * For PPS mode the port has to receive OTEs. For ETR mode
596 * the port has to receive OTEs, the ETR stepping bit has to
597 * be zero and the validity bits for data frame 1, 2, and 3
600 static int etr_port_valid(struct etr_aib *aib, int port)
604 /* Check that this port is receiving OTEs. */
608 psc = port ? aib->esw.psc1 : aib->esw.psc0;
609 if (psc == etr_lpsc_pps_mode)
611 if (psc == etr_lpsc_operational_step)
612 return !aib->esw.y && aib->slsw.v1 &&
613 aib->slsw.v2 && aib->slsw.v3;
618 * Check if two ports are on the same network.
620 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
622 // FIXME: any other fields we have to compare?
623 return aib1->edf1.net_id == aib2->edf1.net_id;
627 * Wrapper for etr_stei that converts physical port states
628 * to logical port states to be consistent with the output
629 * of stetr (see etr_psc vs. etr_lpsc).
631 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
633 BUG_ON(etr_steai(aib, func) != 0);
634 /* Convert port state to logical port state. */
635 if (aib->esw.psc0 == 1)
637 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
639 if (aib->esw.psc1 == 1)
641 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
646 * Check if the aib a2 is still connected to the same attachment as
647 * aib a1, the etv values differ by one and a2 is valid.
649 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
651 int state_a1, state_a2;
653 /* Paranoia check: e0/e1 should better be the same. */
654 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
655 a1->esw.eacr.e1 != a2->esw.eacr.e1)
658 /* Still connected to the same etr ? */
659 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
660 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
661 if (state_a1 == etr_lpsc_operational_step) {
662 if (state_a2 != etr_lpsc_operational_step ||
663 a1->edf1.net_id != a2->edf1.net_id ||
664 a1->edf1.etr_id != a2->edf1.etr_id ||
665 a1->edf1.etr_pn != a2->edf1.etr_pn)
667 } else if (state_a2 != etr_lpsc_pps_mode)
670 /* The ETV value of a2 needs to be ETV of a1 + 1. */
671 if (a1->edf2.etv + 1 != a2->edf2.etv)
674 if (!etr_port_valid(a2, p))
680 struct clock_sync_data {
683 unsigned long long fixup_cc;
685 struct etr_aib *etr_aib;
688 static void clock_sync_cpu(struct clock_sync_data *sync)
690 atomic_dec(&sync->cpus);
693 * This looks like a busy wait loop but it isn't. etr_sync_cpus
694 * is called on all other cpus while the TOD clocks is stopped.
695 * __udelay will stop the cpu on an enabled wait psw until the
696 * TOD is running again.
698 while (sync->in_sync == 0) {
701 * A different cpu changes *in_sync. Therefore use
702 * barrier() to force memory access.
706 if (sync->in_sync != 1)
707 /* Didn't work. Clear per-cpu in sync bit again. */
708 disable_sync_clock(NULL);
710 * This round of TOD syncing is done. Set the clock comparator
711 * to the next tick and let the processor continue.
713 fixup_clock_comparator(sync->fixup_cc);
717 * Sync the TOD clock using the port refered to by aibp. This port
718 * has to be enabled and the other port has to be disabled. The
719 * last eacr update has to be more than 1.6 seconds in the past.
721 static int etr_sync_clock(void *data)
724 unsigned long long clock, old_clock, delay, delta;
725 struct clock_sync_data *etr_sync;
726 struct etr_aib *sync_port, *aib;
732 if (xchg(&first, 1) == 1) {
734 clock_sync_cpu(etr_sync);
738 /* Wait until all other cpus entered the sync function. */
739 while (atomic_read(&etr_sync->cpus) != 0)
742 port = etr_sync->etr_port;
743 aib = etr_sync->etr_aib;
744 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
747 /* Set clock to next OTE. */
748 __ctl_set_bit(14, 21);
749 __ctl_set_bit(0, 29);
750 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
751 old_clock = get_clock();
752 if (set_clock(clock) == 0) {
753 __udelay(1); /* Wait for the clock to start. */
754 __ctl_clear_bit(0, 29);
755 __ctl_clear_bit(14, 21);
757 /* Adjust Linux timing variables. */
758 delay = (unsigned long long)
759 (aib->edf2.etv - sync_port->edf2.etv) << 32;
760 delta = adjust_time(old_clock, clock, delay);
761 etr_sync->fixup_cc = delta;
762 fixup_clock_comparator(delta);
763 /* Verify that the clock is properly set. */
764 if (!etr_aib_follows(sync_port, aib, port)) {
766 disable_sync_clock(NULL);
767 etr_sync->in_sync = -EAGAIN;
770 etr_sync->in_sync = 1;
774 /* Could not set the clock ?!? */
775 __ctl_clear_bit(0, 29);
776 __ctl_clear_bit(14, 21);
777 disable_sync_clock(NULL);
778 etr_sync->in_sync = -EAGAIN;
785 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
787 struct clock_sync_data etr_sync;
788 struct etr_aib *sync_port;
792 /* Check if the current aib is adjacent to the sync port aib. */
793 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
794 follows = etr_aib_follows(sync_port, aib, port);
795 memcpy(sync_port, aib, sizeof(*aib));
798 memset(&etr_sync, 0, sizeof(etr_sync));
799 etr_sync.etr_aib = aib;
800 etr_sync.etr_port = port;
802 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
803 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
809 * Handle the immediate effects of the different events.
810 * The port change event is used for online/offline changes.
812 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
814 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
816 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
817 eacr.es = eacr.sl = 0;
818 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
819 etr_port0_uptodate = etr_port1_uptodate = 0;
821 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
824 * Port change of an enabled port. We have to
825 * assume that this can have caused an stepping
828 etr_tolec = get_clock();
829 eacr.p0 = etr_port0_online;
832 etr_port0_uptodate = 0;
834 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
837 * Port change of an enabled port. We have to
838 * assume that this can have caused an stepping
841 etr_tolec = get_clock();
842 eacr.p1 = etr_port1_online;
845 etr_port1_uptodate = 0;
847 clear_bit(ETR_EVENT_UPDATE, &etr_events);
852 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
853 * one of the ports needs an update.
855 static void etr_set_tolec_timeout(unsigned long long now)
857 unsigned long micros;
859 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
860 (!etr_eacr.p1 || etr_port1_uptodate))
862 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
863 micros = (micros > 1600000) ? 0 : 1600000 - micros;
864 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
868 * Set up a time that expires after 1/2 second.
870 static void etr_set_sync_timeout(void)
872 mod_timer(&etr_timer, jiffies + HZ/2);
876 * Update the aib information for one or both ports.
878 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
879 struct etr_eacr eacr)
881 /* With both ports disabled the aib information is useless. */
882 if (!eacr.e0 && !eacr.e1)
885 /* Update port0 or port1 with aib stored in etr_work_fn. */
886 if (aib->esw.q == 0) {
887 /* Information for port 0 stored. */
888 if (eacr.p0 && !etr_port0_uptodate) {
890 if (etr_port0_online)
891 etr_port0_uptodate = 1;
894 /* Information for port 1 stored. */
895 if (eacr.p1 && !etr_port1_uptodate) {
897 if (etr_port0_online)
898 etr_port1_uptodate = 1;
903 * Do not try to get the alternate port aib if the clock
904 * is not in sync yet.
906 if (!check_sync_clock())
910 * If steai is available we can get the information about
911 * the other port immediately. If only stetr is available the
912 * data-port bit toggle has to be used.
914 if (etr_steai_available) {
915 if (eacr.p0 && !etr_port0_uptodate) {
916 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
917 etr_port0_uptodate = 1;
919 if (eacr.p1 && !etr_port1_uptodate) {
920 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
921 etr_port1_uptodate = 1;
925 * One port was updated above, if the other
926 * port is not uptodate toggle dp bit.
928 if ((eacr.p0 && !etr_port0_uptodate) ||
929 (eacr.p1 && !etr_port1_uptodate))
938 * Write new etr control register if it differs from the current one.
939 * Return 1 if etr_tolec has been updated as well.
941 static void etr_update_eacr(struct etr_eacr eacr)
945 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
946 /* No change, return. */
949 * The disable of an active port of the change of the data port
950 * bit can/will cause a change in the data port.
952 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
953 (etr_eacr.dp ^ eacr.dp) != 0;
957 etr_tolec = get_clock();
961 * ETR work. In this function you'll find the main logic. In
962 * particular this is the only function that calls etr_update_eacr(),
963 * it "controls" the etr control register.
965 static void etr_work_fn(struct work_struct *work)
967 unsigned long long now;
968 struct etr_eacr eacr;
972 /* prevent multiple execution. */
973 mutex_lock(&etr_work_mutex);
975 /* Create working copy of etr_eacr. */
978 /* Check for the different events and their immediate effects. */
979 eacr = etr_handle_events(eacr);
981 /* Check if ETR is supposed to be active. */
982 eacr.ea = eacr.p0 || eacr.p1;
984 /* Both ports offline. Reset everything. */
985 eacr.dp = eacr.es = eacr.sl = 0;
986 on_each_cpu(disable_sync_clock, NULL, 1);
987 del_timer_sync(&etr_timer);
988 etr_update_eacr(eacr);
992 /* Store aib to get the current ETR status word. */
993 BUG_ON(etr_stetr(&aib) != 0);
994 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
998 * Update the port information if the last stepping port change
999 * or data port change is older than 1.6 seconds.
1001 if (now >= etr_tolec + (1600000 << 12))
1002 eacr = etr_handle_update(&aib, eacr);
1005 * Select ports to enable. The prefered synchronization mode is PPS.
1006 * If a port can be enabled depends on a number of things:
1007 * 1) The port needs to be online and uptodate. A port is not
1008 * disabled just because it is not uptodate, but it is only
1009 * enabled if it is uptodate.
1010 * 2) The port needs to have the same mode (pps / etr).
1011 * 3) The port needs to be usable -> etr_port_valid() == 1
1012 * 4) To enable the second port the clock needs to be in sync.
1013 * 5) If both ports are useable and are ETR ports, the network id
1014 * has to be the same.
1015 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1017 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1020 if (!etr_mode_is_pps(etr_eacr))
1022 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1024 // FIXME: uptodate checks ?
1025 else if (etr_port0_uptodate && etr_port1_uptodate)
1027 sync_port = (etr_port0_uptodate &&
1028 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1029 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1033 if (!etr_mode_is_pps(etr_eacr))
1035 sync_port = (etr_port1_uptodate &&
1036 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1037 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1040 if (!etr_mode_is_etr(etr_eacr))
1042 if (!eacr.es || !eacr.p1 ||
1043 aib.esw.psc1 != etr_lpsc_operational_alt)
1045 else if (etr_port0_uptodate && etr_port1_uptodate &&
1046 etr_compare_network(&etr_port0, &etr_port1))
1048 sync_port = (etr_port0_uptodate &&
1049 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1050 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1054 if (!etr_mode_is_etr(etr_eacr))
1056 sync_port = (etr_port1_uptodate &&
1057 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1059 /* Both ports not usable. */
1060 eacr.es = eacr.sl = 0;
1065 * If the clock is in sync just update the eacr and return.
1066 * If there is no valid sync port wait for a port update.
1068 if (check_sync_clock() || sync_port < 0) {
1069 etr_update_eacr(eacr);
1070 etr_set_tolec_timeout(now);
1075 * Prepare control register for clock syncing
1076 * (reset data port bit, set sync check control.
1082 * Update eacr and try to synchronize the clock. If the update
1083 * of eacr caused a stepping port switch (or if we have to
1084 * assume that a stepping port switch has occured) or the
1085 * clock syncing failed, reset the sync check control bit
1086 * and set up a timer to try again after 0.5 seconds
1088 etr_update_eacr(eacr);
1089 if (now < etr_tolec + (1600000 << 12) ||
1090 etr_sync_clock_stop(&aib, sync_port) != 0) {
1091 /* Sync failed. Try again in 1/2 second. */
1093 etr_update_eacr(eacr);
1094 etr_set_sync_timeout();
1096 etr_set_tolec_timeout(now);
1098 mutex_unlock(&etr_work_mutex);
1102 * Sysfs interface functions
1104 static struct sysdev_class etr_sysclass = {
1108 static struct sys_device etr_port0_dev = {
1110 .cls = &etr_sysclass,
1113 static struct sys_device etr_port1_dev = {
1115 .cls = &etr_sysclass,
1119 * ETR class attributes
1121 static ssize_t etr_stepping_port_show(struct sysdev_class *class,
1122 struct sysdev_class_attribute *attr,
1125 return sprintf(buf, "%i\n", etr_port0.esw.p);
1128 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1130 static ssize_t etr_stepping_mode_show(struct sysdev_class *class,
1131 struct sysdev_class_attribute *attr,
1136 if (etr_mode_is_pps(etr_eacr))
1138 else if (etr_mode_is_etr(etr_eacr))
1142 return sprintf(buf, "%s\n", mode_str);
1145 static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1148 * ETR port attributes
1150 static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1152 if (dev == &etr_port0_dev)
1153 return etr_port0_online ? &etr_port0 : NULL;
1155 return etr_port1_online ? &etr_port1 : NULL;
1158 static ssize_t etr_online_show(struct sys_device *dev,
1159 struct sysdev_attribute *attr,
1162 unsigned int online;
1164 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1165 return sprintf(buf, "%i\n", online);
1168 static ssize_t etr_online_store(struct sys_device *dev,
1169 struct sysdev_attribute *attr,
1170 const char *buf, size_t count)
1174 value = simple_strtoul(buf, NULL, 0);
1175 if (value != 0 && value != 1)
1177 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1179 mutex_lock(&clock_sync_mutex);
1180 if (dev == &etr_port0_dev) {
1181 if (etr_port0_online == value)
1182 goto out; /* Nothing to do. */
1183 etr_port0_online = value;
1184 if (etr_port0_online && etr_port1_online)
1185 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1187 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1188 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1189 queue_work(time_sync_wq, &etr_work);
1191 if (etr_port1_online == value)
1192 goto out; /* Nothing to do. */
1193 etr_port1_online = value;
1194 if (etr_port0_online && etr_port1_online)
1195 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1197 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1198 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1199 queue_work(time_sync_wq, &etr_work);
1202 mutex_unlock(&clock_sync_mutex);
1206 static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1208 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1209 struct sysdev_attribute *attr,
1212 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1213 etr_eacr.e0 : etr_eacr.e1);
1216 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1218 static ssize_t etr_mode_code_show(struct sys_device *dev,
1219 struct sysdev_attribute *attr, char *buf)
1221 if (!etr_port0_online && !etr_port1_online)
1222 /* Status word is not uptodate if both ports are offline. */
1224 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1225 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1228 static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1230 static ssize_t etr_untuned_show(struct sys_device *dev,
1231 struct sysdev_attribute *attr, char *buf)
1233 struct etr_aib *aib = etr_aib_from_dev(dev);
1235 if (!aib || !aib->slsw.v1)
1237 return sprintf(buf, "%i\n", aib->edf1.u);
1240 static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1242 static ssize_t etr_network_id_show(struct sys_device *dev,
1243 struct sysdev_attribute *attr, char *buf)
1245 struct etr_aib *aib = etr_aib_from_dev(dev);
1247 if (!aib || !aib->slsw.v1)
1249 return sprintf(buf, "%i\n", aib->edf1.net_id);
1252 static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1254 static ssize_t etr_id_show(struct sys_device *dev,
1255 struct sysdev_attribute *attr, char *buf)
1257 struct etr_aib *aib = etr_aib_from_dev(dev);
1259 if (!aib || !aib->slsw.v1)
1261 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1264 static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1266 static ssize_t etr_port_number_show(struct sys_device *dev,
1267 struct sysdev_attribute *attr, char *buf)
1269 struct etr_aib *aib = etr_aib_from_dev(dev);
1271 if (!aib || !aib->slsw.v1)
1273 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1276 static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1278 static ssize_t etr_coupled_show(struct sys_device *dev,
1279 struct sysdev_attribute *attr, char *buf)
1281 struct etr_aib *aib = etr_aib_from_dev(dev);
1283 if (!aib || !aib->slsw.v3)
1285 return sprintf(buf, "%i\n", aib->edf3.c);
1288 static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1290 static ssize_t etr_local_time_show(struct sys_device *dev,
1291 struct sysdev_attribute *attr, char *buf)
1293 struct etr_aib *aib = etr_aib_from_dev(dev);
1295 if (!aib || !aib->slsw.v3)
1297 return sprintf(buf, "%i\n", aib->edf3.blto);
1300 static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1302 static ssize_t etr_utc_offset_show(struct sys_device *dev,
1303 struct sysdev_attribute *attr, char *buf)
1305 struct etr_aib *aib = etr_aib_from_dev(dev);
1307 if (!aib || !aib->slsw.v3)
1309 return sprintf(buf, "%i\n", aib->edf3.buo);
1312 static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1314 static struct sysdev_attribute *etr_port_attributes[] = {
1316 &attr_stepping_control,
1328 static int __init etr_register_port(struct sys_device *dev)
1330 struct sysdev_attribute **attr;
1333 rc = sysdev_register(dev);
1336 for (attr = etr_port_attributes; *attr; attr++) {
1337 rc = sysdev_create_file(dev, *attr);
1343 for (; attr >= etr_port_attributes; attr--)
1344 sysdev_remove_file(dev, *attr);
1345 sysdev_unregister(dev);
1350 static void __init etr_unregister_port(struct sys_device *dev)
1352 struct sysdev_attribute **attr;
1354 for (attr = etr_port_attributes; *attr; attr++)
1355 sysdev_remove_file(dev, *attr);
1356 sysdev_unregister(dev);
1359 static int __init etr_init_sysfs(void)
1363 rc = sysdev_class_register(&etr_sysclass);
1366 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1368 goto out_unreg_class;
1369 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1371 goto out_remove_stepping_port;
1372 rc = etr_register_port(&etr_port0_dev);
1374 goto out_remove_stepping_mode;
1375 rc = etr_register_port(&etr_port1_dev);
1377 goto out_remove_port0;
1381 etr_unregister_port(&etr_port0_dev);
1382 out_remove_stepping_mode:
1383 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1384 out_remove_stepping_port:
1385 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1387 sysdev_class_unregister(&etr_sysclass);
1392 device_initcall(etr_init_sysfs);
1395 * Server Time Protocol (STP) code.
1397 static int stp_online;
1398 static struct stp_sstpi stp_info;
1399 static void *stp_page;
1401 static void stp_work_fn(struct work_struct *work);
1402 static DEFINE_MUTEX(stp_work_mutex);
1403 static DECLARE_WORK(stp_work, stp_work_fn);
1404 static struct timer_list stp_timer;
1406 static int __init early_parse_stp(char *p)
1408 if (strncmp(p, "off", 3) == 0)
1410 else if (strncmp(p, "on", 2) == 0)
1414 early_param("stp", early_parse_stp);
1417 * Reset STP attachment.
1419 static void __init stp_reset(void)
1423 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1424 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1426 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1427 else if (stp_online) {
1428 pr_warning("The real or virtual hardware system does "
1429 "not provide an STP interface\n");
1430 free_page((unsigned long) stp_page);
1436 static void stp_timeout(unsigned long dummy)
1438 queue_work(time_sync_wq, &stp_work);
1441 static int __init stp_init(void)
1443 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1445 setup_timer(&stp_timer, stp_timeout, 0UL);
1449 queue_work(time_sync_wq, &stp_work);
1453 arch_initcall(stp_init);
1456 * STP timing alert. There are three causes:
1457 * 1) timing status change
1458 * 2) link availability change
1459 * 3) time control parameter change
1460 * In all three cases we are only interested in the clock source state.
1461 * If a STP clock source is now available use it.
1463 static void stp_timing_alert(struct stp_irq_parm *intparm)
1465 if (intparm->tsc || intparm->lac || intparm->tcpc)
1466 queue_work(time_sync_wq, &stp_work);
1470 * STP sync check machine check. This is called when the timing state
1471 * changes from the synchronized state to the unsynchronized state.
1472 * After a STP sync check the clock is not in sync. The machine check
1473 * is broadcasted to all cpus at the same time.
1475 void stp_sync_check(void)
1477 disable_sync_clock(NULL);
1478 queue_work(time_sync_wq, &stp_work);
1482 * STP island condition machine check. This is called when an attached
1483 * server attempts to communicate over an STP link and the servers
1484 * have matching CTN ids and have a valid stratum-1 configuration
1485 * but the configurations do not match.
1487 void stp_island_check(void)
1489 disable_sync_clock(NULL);
1490 queue_work(time_sync_wq, &stp_work);
1494 static int stp_sync_clock(void *data)
1497 unsigned long long old_clock, delta;
1498 struct clock_sync_data *stp_sync;
1503 if (xchg(&first, 1) == 1) {
1505 clock_sync_cpu(stp_sync);
1509 /* Wait until all other cpus entered the sync function. */
1510 while (atomic_read(&stp_sync->cpus) != 0)
1513 enable_sync_clock();
1516 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1517 stp_info.todoff[2] || stp_info.todoff[3] ||
1518 stp_info.tmd != 2) {
1519 old_clock = get_clock();
1520 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1522 delta = adjust_time(old_clock, get_clock(), 0);
1523 fixup_clock_comparator(delta);
1524 rc = chsc_sstpi(stp_page, &stp_info,
1525 sizeof(struct stp_sstpi));
1526 if (rc == 0 && stp_info.tmd != 2)
1531 disable_sync_clock(NULL);
1532 stp_sync->in_sync = -EAGAIN;
1534 stp_sync->in_sync = 1;
1540 * STP work. Check for the STP state and take over the clock
1541 * synchronization if the STP clock source is usable.
1543 static void stp_work_fn(struct work_struct *work)
1545 struct clock_sync_data stp_sync;
1548 /* prevent multiple execution. */
1549 mutex_lock(&stp_work_mutex);
1552 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1553 del_timer_sync(&stp_timer);
1557 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1561 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1562 if (rc || stp_info.c == 0)
1565 /* Skip synchronization if the clock is already in sync. */
1566 if (check_sync_clock())
1569 memset(&stp_sync, 0, sizeof(stp_sync));
1571 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1572 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1575 if (!check_sync_clock())
1577 * There is a usable clock but the synchonization failed.
1578 * Retry after a second.
1580 mod_timer(&stp_timer, jiffies + HZ);
1583 mutex_unlock(&stp_work_mutex);
1587 * STP class sysfs interface functions
1589 static struct sysdev_class stp_sysclass = {
1593 static ssize_t stp_ctn_id_show(struct sysdev_class *class,
1594 struct sysdev_class_attribute *attr,
1599 return sprintf(buf, "%016llx\n",
1600 *(unsigned long long *) stp_info.ctnid);
1603 static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1605 static ssize_t stp_ctn_type_show(struct sysdev_class *class,
1606 struct sysdev_class_attribute *attr,
1611 return sprintf(buf, "%i\n", stp_info.ctn);
1614 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1616 static ssize_t stp_dst_offset_show(struct sysdev_class *class,
1617 struct sysdev_class_attribute *attr,
1620 if (!stp_online || !(stp_info.vbits & 0x2000))
1622 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1625 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1627 static ssize_t stp_leap_seconds_show(struct sysdev_class *class,
1628 struct sysdev_class_attribute *attr,
1631 if (!stp_online || !(stp_info.vbits & 0x8000))
1633 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1636 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1638 static ssize_t stp_stratum_show(struct sysdev_class *class,
1639 struct sysdev_class_attribute *attr,
1644 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1647 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1649 static ssize_t stp_time_offset_show(struct sysdev_class *class,
1650 struct sysdev_class_attribute *attr,
1653 if (!stp_online || !(stp_info.vbits & 0x0800))
1655 return sprintf(buf, "%i\n", (int) stp_info.tto);
1658 static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1660 static ssize_t stp_time_zone_offset_show(struct sysdev_class *class,
1661 struct sysdev_class_attribute *attr,
1664 if (!stp_online || !(stp_info.vbits & 0x4000))
1666 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1669 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1670 stp_time_zone_offset_show, NULL);
1672 static ssize_t stp_timing_mode_show(struct sysdev_class *class,
1673 struct sysdev_class_attribute *attr,
1678 return sprintf(buf, "%i\n", stp_info.tmd);
1681 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1683 static ssize_t stp_timing_state_show(struct sysdev_class *class,
1684 struct sysdev_class_attribute *attr,
1689 return sprintf(buf, "%i\n", stp_info.tst);
1692 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1694 static ssize_t stp_online_show(struct sysdev_class *class,
1695 struct sysdev_class_attribute *attr,
1698 return sprintf(buf, "%i\n", stp_online);
1701 static ssize_t stp_online_store(struct sysdev_class *class,
1702 struct sysdev_class_attribute *attr,
1703 const char *buf, size_t count)
1707 value = simple_strtoul(buf, NULL, 0);
1708 if (value != 0 && value != 1)
1710 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1712 mutex_lock(&clock_sync_mutex);
1715 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1717 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1718 queue_work(time_sync_wq, &stp_work);
1719 mutex_unlock(&clock_sync_mutex);
1724 * Can't use SYSDEV_CLASS_ATTR because the attribute should be named
1725 * stp/online but attr_online already exists in this file ..
1727 static struct sysdev_class_attribute attr_stp_online = {
1728 .attr = { .name = "online", .mode = 0600 },
1729 .show = stp_online_show,
1730 .store = stp_online_store,
1733 static struct sysdev_class_attribute *stp_attributes[] = {
1741 &attr_time_zone_offset,
1747 static int __init stp_init_sysfs(void)
1749 struct sysdev_class_attribute **attr;
1752 rc = sysdev_class_register(&stp_sysclass);
1755 for (attr = stp_attributes; *attr; attr++) {
1756 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1762 for (; attr >= stp_attributes; attr--)
1763 sysdev_class_remove_file(&stp_sysclass, *attr);
1764 sysdev_class_unregister(&stp_sysclass);
1769 device_initcall(stp_init_sysfs);