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 <asm/uaccess.h>
40 #include <asm/delay.h>
41 #include <asm/s390_ext.h>
42 #include <asm/div64.h>
45 #include <asm/irq_regs.h>
46 #include <asm/timer.h>
50 /* change this if you have some constant time drift */
51 #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
52 #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
55 * Create a small time difference between the timer interrupts
56 * on the different cpus to avoid lock contention.
58 #define CPU_DEVIATION (smp_processor_id() << 12)
60 #define TICK_SIZE tick
62 u64 sched_clock_base_cc = -1; /* Force to data section. */
64 static DEFINE_PER_CPU(struct clock_event_device, comparators);
67 * Scheduler clock - returns current time in nanosec units.
69 unsigned long long notrace sched_clock(void)
71 return ((get_clock_xt() - sched_clock_base_cc) * 125) >> 9;
75 * Monotonic_clock - returns # of nanoseconds passed since time_init()
77 unsigned long long monotonic_clock(void)
81 EXPORT_SYMBOL(monotonic_clock);
83 void tod_to_timeval(__u64 todval, struct timespec *xtime)
85 unsigned long long sec;
90 todval -= (sec * 1000000) << 12;
91 xtime->tv_nsec = ((todval * 1000) >> 12);
94 void clock_comparator_work(void)
96 struct clock_event_device *cd;
98 S390_lowcore.clock_comparator = -1ULL;
99 set_clock_comparator(S390_lowcore.clock_comparator);
100 cd = &__get_cpu_var(comparators);
101 cd->event_handler(cd);
105 * Fixup the clock comparator.
107 static void fixup_clock_comparator(unsigned long long delta)
109 /* If nobody is waiting there's nothing to fix. */
110 if (S390_lowcore.clock_comparator == -1ULL)
112 S390_lowcore.clock_comparator += delta;
113 set_clock_comparator(S390_lowcore.clock_comparator);
116 static int s390_next_event(unsigned long delta,
117 struct clock_event_device *evt)
119 S390_lowcore.clock_comparator = get_clock() + delta;
120 set_clock_comparator(S390_lowcore.clock_comparator);
124 static void s390_set_mode(enum clock_event_mode mode,
125 struct clock_event_device *evt)
130 * Set up lowcore and control register of the current cpu to
131 * enable TOD clock and clock comparator interrupts.
133 void init_cpu_timer(void)
135 struct clock_event_device *cd;
138 S390_lowcore.clock_comparator = -1ULL;
139 set_clock_comparator(S390_lowcore.clock_comparator);
141 cpu = smp_processor_id();
142 cd = &per_cpu(comparators, cpu);
143 cd->name = "comparator";
144 cd->features = CLOCK_EVT_FEAT_ONESHOT;
147 cd->min_delta_ns = 1;
148 cd->max_delta_ns = LONG_MAX;
150 cd->cpumask = cpumask_of(cpu);
151 cd->set_next_event = s390_next_event;
152 cd->set_mode = s390_set_mode;
154 clockevents_register_device(cd);
156 /* Enable clock comparator timer interrupt. */
159 /* Always allow the timing alert external interrupt. */
163 static void clock_comparator_interrupt(__u16 code)
165 if (S390_lowcore.clock_comparator == -1ULL)
166 set_clock_comparator(S390_lowcore.clock_comparator);
169 static void etr_timing_alert(struct etr_irq_parm *);
170 static void stp_timing_alert(struct stp_irq_parm *);
172 static void timing_alert_interrupt(__u16 code)
174 if (S390_lowcore.ext_params & 0x00c40000)
175 etr_timing_alert((struct etr_irq_parm *)
176 &S390_lowcore.ext_params);
177 if (S390_lowcore.ext_params & 0x00038000)
178 stp_timing_alert((struct stp_irq_parm *)
179 &S390_lowcore.ext_params);
182 static void etr_reset(void);
183 static void stp_reset(void);
185 unsigned long read_persistent_clock(void)
189 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, &ts);
193 static cycle_t read_tod_clock(struct clocksource *cs)
198 static struct clocksource clocksource_tod = {
201 .read = read_tod_clock,
205 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
208 struct clocksource * __init clocksource_default_clock(void)
210 return &clocksource_tod;
213 void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
215 if (clock != &clocksource_tod)
218 /* Make userspace gettimeofday spin until we're done. */
219 ++vdso_data->tb_update_count;
221 vdso_data->xtime_tod_stamp = clock->cycle_last;
222 vdso_data->xtime_clock_sec = xtime.tv_sec;
223 vdso_data->xtime_clock_nsec = xtime.tv_nsec;
224 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
225 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
227 ++vdso_data->tb_update_count;
230 extern struct timezone sys_tz;
232 void update_vsyscall_tz(void)
234 /* Make userspace gettimeofday spin until we're done. */
235 ++vdso_data->tb_update_count;
237 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
238 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
240 ++vdso_data->tb_update_count;
244 * Initialize the TOD clock and the CPU timer of
247 void __init time_init(void)
253 /* Reset time synchronization interfaces. */
257 /* request the clock comparator external interrupt */
258 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
259 panic("Couldn't request external interrupt 0x1004");
261 /* request the timing alert external interrupt */
262 if (register_external_interrupt(0x1406, timing_alert_interrupt))
263 panic("Couldn't request external interrupt 0x1406");
265 if (clocksource_register(&clocksource_tod) != 0)
266 panic("Could not register TOD clock source");
269 * The TOD clock is an accurate clock. The xtime should be
270 * initialized in a way that the difference between TOD and
271 * xtime is reasonably small. Too bad that timekeeping_init
272 * sets xtime.tv_nsec to zero. In addition the clock source
273 * change from the jiffies clock source to the TOD clock
274 * source add another error of up to 1/HZ second. The same
275 * function sets wall_to_monotonic to a value that is too
276 * small for /proc/uptime to be accurate.
277 * Reset xtime and wall_to_monotonic to sane values.
279 write_seqlock_irqsave(&xtime_lock, flags);
281 tod_to_timeval(now - TOD_UNIX_EPOCH, &xtime);
282 clocksource_tod.cycle_last = now;
283 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &ts);
284 set_normalized_timespec(&wall_to_monotonic, -ts.tv_sec, -ts.tv_nsec);
285 write_sequnlock_irqrestore(&xtime_lock, flags);
287 /* Enable TOD clock interrupts on the boot cpu. */
290 /* Enable cpu timer interrupts on the boot cpu. */
295 * The time is "clock". old is what we think the time is.
296 * Adjust the value by a multiple of jiffies and add the delta to ntp.
297 * "delay" is an approximation how long the synchronization took. If
298 * the time correction is positive, then "delay" is subtracted from
299 * the time difference and only the remaining part is passed to ntp.
301 static unsigned long long adjust_time(unsigned long long old,
302 unsigned long long clock,
303 unsigned long long delay)
305 unsigned long long delta, ticks;
309 /* It is later than we thought. */
310 delta = ticks = clock - old;
311 delta = ticks = (delta < delay) ? 0 : delta - delay;
312 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
313 adjust.offset = ticks * (1000000 / HZ);
315 /* It is earlier than we thought. */
316 delta = ticks = old - clock;
317 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
319 adjust.offset = -ticks * (1000000 / HZ);
321 sched_clock_base_cc += delta;
322 if (adjust.offset != 0) {
323 pr_notice("The ETR interface has adjusted the clock "
324 "by %li microseconds\n", adjust.offset);
325 adjust.modes = ADJ_OFFSET_SINGLESHOT;
326 do_adjtimex(&adjust);
331 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
332 static DEFINE_MUTEX(clock_sync_mutex);
333 static unsigned long clock_sync_flags;
335 #define CLOCK_SYNC_HAS_ETR 0
336 #define CLOCK_SYNC_HAS_STP 1
337 #define CLOCK_SYNC_ETR 2
338 #define CLOCK_SYNC_STP 3
341 * The synchronous get_clock function. It will write the current clock
342 * value to the clock pointer and return 0 if the clock is in sync with
343 * the external time source. If the clock mode is local it will return
344 * -ENOSYS and -EAGAIN if the clock is not in sync with the external
347 int get_sync_clock(unsigned long long *clock)
350 unsigned int sw0, sw1;
352 sw_ptr = &get_cpu_var(clock_sync_word);
353 sw0 = atomic_read(sw_ptr);
354 *clock = get_clock();
355 sw1 = atomic_read(sw_ptr);
356 put_cpu_var(clock_sync_sync);
357 if (sw0 == sw1 && (sw0 & 0x80000000U))
358 /* Success: time is in sync. */
360 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
361 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
363 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
364 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
368 EXPORT_SYMBOL(get_sync_clock);
371 * Make get_sync_clock return -EAGAIN.
373 static void disable_sync_clock(void *dummy)
375 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
377 * Clear the in-sync bit 2^31. All get_sync_clock calls will
378 * fail until the sync bit is turned back on. In addition
379 * increase the "sequence" counter to avoid the race of an
380 * etr event and the complete recovery against get_sync_clock.
382 atomic_clear_mask(0x80000000, sw_ptr);
387 * Make get_sync_clock return 0 again.
388 * Needs to be called from a context disabled for preemption.
390 static void enable_sync_clock(void)
392 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
393 atomic_set_mask(0x80000000, sw_ptr);
397 * Function to check if the clock is in sync.
399 static inline int check_sync_clock(void)
404 sw_ptr = &get_cpu_var(clock_sync_word);
405 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
406 put_cpu_var(clock_sync_sync);
410 /* Single threaded workqueue used for etr and stp sync events */
411 static struct workqueue_struct *time_sync_wq;
413 static void __init time_init_wq(void)
417 time_sync_wq = create_singlethread_workqueue("timesync");
418 stop_machine_create();
422 * External Time Reference (ETR) code.
424 static int etr_port0_online;
425 static int etr_port1_online;
426 static int etr_steai_available;
428 static int __init early_parse_etr(char *p)
430 if (strncmp(p, "off", 3) == 0)
431 etr_port0_online = etr_port1_online = 0;
432 else if (strncmp(p, "port0", 5) == 0)
433 etr_port0_online = 1;
434 else if (strncmp(p, "port1", 5) == 0)
435 etr_port1_online = 1;
436 else if (strncmp(p, "on", 2) == 0)
437 etr_port0_online = etr_port1_online = 1;
440 early_param("etr", early_parse_etr);
443 ETR_EVENT_PORT0_CHANGE,
444 ETR_EVENT_PORT1_CHANGE,
445 ETR_EVENT_PORT_ALERT,
446 ETR_EVENT_SYNC_CHECK,
447 ETR_EVENT_SWITCH_LOCAL,
452 * Valid bit combinations of the eacr register are (x = don't care):
453 * e0 e1 dp p0 p1 ea es sl
454 * 0 0 x 0 0 0 0 0 initial, disabled state
455 * 0 0 x 0 1 1 0 0 port 1 online
456 * 0 0 x 1 0 1 0 0 port 0 online
457 * 0 0 x 1 1 1 0 0 both ports online
458 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
459 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
460 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
461 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
462 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
463 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
464 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
465 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
466 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
467 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
468 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
469 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
470 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
471 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
472 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
473 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
475 static struct etr_eacr etr_eacr;
476 static u64 etr_tolec; /* time of last eacr update */
477 static struct etr_aib etr_port0;
478 static int etr_port0_uptodate;
479 static struct etr_aib etr_port1;
480 static int etr_port1_uptodate;
481 static unsigned long etr_events;
482 static struct timer_list etr_timer;
484 static void etr_timeout(unsigned long dummy);
485 static void etr_work_fn(struct work_struct *work);
486 static DEFINE_MUTEX(etr_work_mutex);
487 static DECLARE_WORK(etr_work, etr_work_fn);
490 * Reset ETR attachment.
492 static void etr_reset(void)
494 etr_eacr = (struct etr_eacr) {
495 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
496 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
498 if (etr_setr(&etr_eacr) == 0) {
499 etr_tolec = get_clock();
500 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
501 if (etr_port0_online && etr_port1_online)
502 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
503 } else if (etr_port0_online || etr_port1_online) {
504 pr_warning("The real or virtual hardware system does "
505 "not provide an ETR interface\n");
506 etr_port0_online = etr_port1_online = 0;
510 static int __init etr_init(void)
514 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
517 /* Check if this machine has the steai instruction. */
518 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
519 etr_steai_available = 1;
520 setup_timer(&etr_timer, etr_timeout, 0UL);
521 if (etr_port0_online) {
522 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
523 queue_work(time_sync_wq, &etr_work);
525 if (etr_port1_online) {
526 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
527 queue_work(time_sync_wq, &etr_work);
532 arch_initcall(etr_init);
535 * Two sorts of ETR machine checks. The architecture reads:
536 * "When a machine-check niterruption occurs and if a switch-to-local or
537 * ETR-sync-check interrupt request is pending but disabled, this pending
538 * disabled interruption request is indicated and is cleared".
539 * Which means that we can get etr_switch_to_local events from the machine
540 * check handler although the interruption condition is disabled. Lovely..
544 * Switch to local machine check. This is called when the last usable
545 * ETR port goes inactive. After switch to local the clock is not in sync.
547 void etr_switch_to_local(void)
551 disable_sync_clock(NULL);
552 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
553 queue_work(time_sync_wq, &etr_work);
557 * ETR sync check machine check. This is called when the ETR OTE and the
558 * local clock OTE are farther apart than the ETR sync check tolerance.
559 * After a ETR sync check the clock is not in sync. The machine check
560 * is broadcasted to all cpus at the same time.
562 void etr_sync_check(void)
566 disable_sync_clock(NULL);
567 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
568 queue_work(time_sync_wq, &etr_work);
572 * ETR timing alert. There are two causes:
573 * 1) port state change, check the usability of the port
574 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
575 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
576 * or ETR-data word 4 (edf4) has changed.
578 static void etr_timing_alert(struct etr_irq_parm *intparm)
581 /* ETR port 0 state change. */
582 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
584 /* ETR port 1 state change. */
585 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
588 * ETR port alert on either port 0, 1 or both.
589 * Both ports are not up-to-date now.
591 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
592 queue_work(time_sync_wq, &etr_work);
595 static void etr_timeout(unsigned long dummy)
597 set_bit(ETR_EVENT_UPDATE, &etr_events);
598 queue_work(time_sync_wq, &etr_work);
602 * Check if the etr mode is pss.
604 static inline int etr_mode_is_pps(struct etr_eacr eacr)
606 return eacr.es && !eacr.sl;
610 * Check if the etr mode is etr.
612 static inline int etr_mode_is_etr(struct etr_eacr eacr)
614 return eacr.es && eacr.sl;
618 * Check if the port can be used for TOD synchronization.
619 * For PPS mode the port has to receive OTEs. For ETR mode
620 * the port has to receive OTEs, the ETR stepping bit has to
621 * be zero and the validity bits for data frame 1, 2, and 3
624 static int etr_port_valid(struct etr_aib *aib, int port)
628 /* Check that this port is receiving OTEs. */
632 psc = port ? aib->esw.psc1 : aib->esw.psc0;
633 if (psc == etr_lpsc_pps_mode)
635 if (psc == etr_lpsc_operational_step)
636 return !aib->esw.y && aib->slsw.v1 &&
637 aib->slsw.v2 && aib->slsw.v3;
642 * Check if two ports are on the same network.
644 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
646 // FIXME: any other fields we have to compare?
647 return aib1->edf1.net_id == aib2->edf1.net_id;
651 * Wrapper for etr_stei that converts physical port states
652 * to logical port states to be consistent with the output
653 * of stetr (see etr_psc vs. etr_lpsc).
655 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
657 BUG_ON(etr_steai(aib, func) != 0);
658 /* Convert port state to logical port state. */
659 if (aib->esw.psc0 == 1)
661 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
663 if (aib->esw.psc1 == 1)
665 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
670 * Check if the aib a2 is still connected to the same attachment as
671 * aib a1, the etv values differ by one and a2 is valid.
673 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
675 int state_a1, state_a2;
677 /* Paranoia check: e0/e1 should better be the same. */
678 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
679 a1->esw.eacr.e1 != a2->esw.eacr.e1)
682 /* Still connected to the same etr ? */
683 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
684 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
685 if (state_a1 == etr_lpsc_operational_step) {
686 if (state_a2 != etr_lpsc_operational_step ||
687 a1->edf1.net_id != a2->edf1.net_id ||
688 a1->edf1.etr_id != a2->edf1.etr_id ||
689 a1->edf1.etr_pn != a2->edf1.etr_pn)
691 } else if (state_a2 != etr_lpsc_pps_mode)
694 /* The ETV value of a2 needs to be ETV of a1 + 1. */
695 if (a1->edf2.etv + 1 != a2->edf2.etv)
698 if (!etr_port_valid(a2, p))
704 struct clock_sync_data {
707 unsigned long long fixup_cc;
709 struct etr_aib *etr_aib;
712 static void clock_sync_cpu(struct clock_sync_data *sync)
714 atomic_dec(&sync->cpus);
717 * This looks like a busy wait loop but it isn't. etr_sync_cpus
718 * is called on all other cpus while the TOD clocks is stopped.
719 * __udelay will stop the cpu on an enabled wait psw until the
720 * TOD is running again.
722 while (sync->in_sync == 0) {
725 * A different cpu changes *in_sync. Therefore use
726 * barrier() to force memory access.
730 if (sync->in_sync != 1)
731 /* Didn't work. Clear per-cpu in sync bit again. */
732 disable_sync_clock(NULL);
734 * This round of TOD syncing is done. Set the clock comparator
735 * to the next tick and let the processor continue.
737 fixup_clock_comparator(sync->fixup_cc);
741 * Sync the TOD clock using the port refered to by aibp. This port
742 * has to be enabled and the other port has to be disabled. The
743 * last eacr update has to be more than 1.6 seconds in the past.
745 static int etr_sync_clock(void *data)
748 unsigned long long clock, old_clock, delay, delta;
749 struct clock_sync_data *etr_sync;
750 struct etr_aib *sync_port, *aib;
756 if (xchg(&first, 1) == 1) {
758 clock_sync_cpu(etr_sync);
762 /* Wait until all other cpus entered the sync function. */
763 while (atomic_read(&etr_sync->cpus) != 0)
766 port = etr_sync->etr_port;
767 aib = etr_sync->etr_aib;
768 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
771 /* Set clock to next OTE. */
772 __ctl_set_bit(14, 21);
773 __ctl_set_bit(0, 29);
774 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
775 old_clock = get_clock();
776 if (set_clock(clock) == 0) {
777 __udelay(1); /* Wait for the clock to start. */
778 __ctl_clear_bit(0, 29);
779 __ctl_clear_bit(14, 21);
781 /* Adjust Linux timing variables. */
782 delay = (unsigned long long)
783 (aib->edf2.etv - sync_port->edf2.etv) << 32;
784 delta = adjust_time(old_clock, clock, delay);
785 etr_sync->fixup_cc = delta;
786 fixup_clock_comparator(delta);
787 /* Verify that the clock is properly set. */
788 if (!etr_aib_follows(sync_port, aib, port)) {
790 disable_sync_clock(NULL);
791 etr_sync->in_sync = -EAGAIN;
794 etr_sync->in_sync = 1;
798 /* Could not set the clock ?!? */
799 __ctl_clear_bit(0, 29);
800 __ctl_clear_bit(14, 21);
801 disable_sync_clock(NULL);
802 etr_sync->in_sync = -EAGAIN;
809 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
811 struct clock_sync_data etr_sync;
812 struct etr_aib *sync_port;
816 /* Check if the current aib is adjacent to the sync port aib. */
817 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
818 follows = etr_aib_follows(sync_port, aib, port);
819 memcpy(sync_port, aib, sizeof(*aib));
822 memset(&etr_sync, 0, sizeof(etr_sync));
823 etr_sync.etr_aib = aib;
824 etr_sync.etr_port = port;
826 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
827 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
833 * Handle the immediate effects of the different events.
834 * The port change event is used for online/offline changes.
836 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
838 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
840 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
841 eacr.es = eacr.sl = 0;
842 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
843 etr_port0_uptodate = etr_port1_uptodate = 0;
845 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
848 * Port change of an enabled port. We have to
849 * assume that this can have caused an stepping
852 etr_tolec = get_clock();
853 eacr.p0 = etr_port0_online;
856 etr_port0_uptodate = 0;
858 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
861 * Port change of an enabled port. We have to
862 * assume that this can have caused an stepping
865 etr_tolec = get_clock();
866 eacr.p1 = etr_port1_online;
869 etr_port1_uptodate = 0;
871 clear_bit(ETR_EVENT_UPDATE, &etr_events);
876 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
877 * one of the ports needs an update.
879 static void etr_set_tolec_timeout(unsigned long long now)
881 unsigned long micros;
883 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
884 (!etr_eacr.p1 || etr_port1_uptodate))
886 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
887 micros = (micros > 1600000) ? 0 : 1600000 - micros;
888 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
892 * Set up a time that expires after 1/2 second.
894 static void etr_set_sync_timeout(void)
896 mod_timer(&etr_timer, jiffies + HZ/2);
900 * Update the aib information for one or both ports.
902 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
903 struct etr_eacr eacr)
905 /* With both ports disabled the aib information is useless. */
906 if (!eacr.e0 && !eacr.e1)
909 /* Update port0 or port1 with aib stored in etr_work_fn. */
910 if (aib->esw.q == 0) {
911 /* Information for port 0 stored. */
912 if (eacr.p0 && !etr_port0_uptodate) {
914 if (etr_port0_online)
915 etr_port0_uptodate = 1;
918 /* Information for port 1 stored. */
919 if (eacr.p1 && !etr_port1_uptodate) {
921 if (etr_port0_online)
922 etr_port1_uptodate = 1;
927 * Do not try to get the alternate port aib if the clock
928 * is not in sync yet.
930 if (!check_sync_clock())
934 * If steai is available we can get the information about
935 * the other port immediately. If only stetr is available the
936 * data-port bit toggle has to be used.
938 if (etr_steai_available) {
939 if (eacr.p0 && !etr_port0_uptodate) {
940 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
941 etr_port0_uptodate = 1;
943 if (eacr.p1 && !etr_port1_uptodate) {
944 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
945 etr_port1_uptodate = 1;
949 * One port was updated above, if the other
950 * port is not uptodate toggle dp bit.
952 if ((eacr.p0 && !etr_port0_uptodate) ||
953 (eacr.p1 && !etr_port1_uptodate))
962 * Write new etr control register if it differs from the current one.
963 * Return 1 if etr_tolec has been updated as well.
965 static void etr_update_eacr(struct etr_eacr eacr)
969 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
970 /* No change, return. */
973 * The disable of an active port of the change of the data port
974 * bit can/will cause a change in the data port.
976 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
977 (etr_eacr.dp ^ eacr.dp) != 0;
981 etr_tolec = get_clock();
985 * ETR work. In this function you'll find the main logic. In
986 * particular this is the only function that calls etr_update_eacr(),
987 * it "controls" the etr control register.
989 static void etr_work_fn(struct work_struct *work)
991 unsigned long long now;
992 struct etr_eacr eacr;
996 /* prevent multiple execution. */
997 mutex_lock(&etr_work_mutex);
999 /* Create working copy of etr_eacr. */
1002 /* Check for the different events and their immediate effects. */
1003 eacr = etr_handle_events(eacr);
1005 /* Check if ETR is supposed to be active. */
1006 eacr.ea = eacr.p0 || eacr.p1;
1008 /* Both ports offline. Reset everything. */
1009 eacr.dp = eacr.es = eacr.sl = 0;
1010 on_each_cpu(disable_sync_clock, NULL, 1);
1011 del_timer_sync(&etr_timer);
1012 etr_update_eacr(eacr);
1016 /* Store aib to get the current ETR status word. */
1017 BUG_ON(etr_stetr(&aib) != 0);
1018 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
1022 * Update the port information if the last stepping port change
1023 * or data port change is older than 1.6 seconds.
1025 if (now >= etr_tolec + (1600000 << 12))
1026 eacr = etr_handle_update(&aib, eacr);
1029 * Select ports to enable. The prefered synchronization mode is PPS.
1030 * If a port can be enabled depends on a number of things:
1031 * 1) The port needs to be online and uptodate. A port is not
1032 * disabled just because it is not uptodate, but it is only
1033 * enabled if it is uptodate.
1034 * 2) The port needs to have the same mode (pps / etr).
1035 * 3) The port needs to be usable -> etr_port_valid() == 1
1036 * 4) To enable the second port the clock needs to be in sync.
1037 * 5) If both ports are useable and are ETR ports, the network id
1038 * has to be the same.
1039 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1041 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1044 if (!etr_mode_is_pps(etr_eacr))
1046 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1048 // FIXME: uptodate checks ?
1049 else if (etr_port0_uptodate && etr_port1_uptodate)
1051 sync_port = (etr_port0_uptodate &&
1052 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1053 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1057 if (!etr_mode_is_pps(etr_eacr))
1059 sync_port = (etr_port1_uptodate &&
1060 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1061 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1064 if (!etr_mode_is_etr(etr_eacr))
1066 if (!eacr.es || !eacr.p1 ||
1067 aib.esw.psc1 != etr_lpsc_operational_alt)
1069 else if (etr_port0_uptodate && etr_port1_uptodate &&
1070 etr_compare_network(&etr_port0, &etr_port1))
1072 sync_port = (etr_port0_uptodate &&
1073 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1074 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1078 if (!etr_mode_is_etr(etr_eacr))
1080 sync_port = (etr_port1_uptodate &&
1081 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1083 /* Both ports not usable. */
1084 eacr.es = eacr.sl = 0;
1089 * If the clock is in sync just update the eacr and return.
1090 * If there is no valid sync port wait for a port update.
1092 if (check_sync_clock() || sync_port < 0) {
1093 etr_update_eacr(eacr);
1094 etr_set_tolec_timeout(now);
1099 * Prepare control register for clock syncing
1100 * (reset data port bit, set sync check control.
1106 * Update eacr and try to synchronize the clock. If the update
1107 * of eacr caused a stepping port switch (or if we have to
1108 * assume that a stepping port switch has occured) or the
1109 * clock syncing failed, reset the sync check control bit
1110 * and set up a timer to try again after 0.5 seconds
1112 etr_update_eacr(eacr);
1113 if (now < etr_tolec + (1600000 << 12) ||
1114 etr_sync_clock_stop(&aib, sync_port) != 0) {
1115 /* Sync failed. Try again in 1/2 second. */
1117 etr_update_eacr(eacr);
1118 etr_set_sync_timeout();
1120 etr_set_tolec_timeout(now);
1122 mutex_unlock(&etr_work_mutex);
1126 * Sysfs interface functions
1128 static struct sysdev_class etr_sysclass = {
1132 static struct sys_device etr_port0_dev = {
1134 .cls = &etr_sysclass,
1137 static struct sys_device etr_port1_dev = {
1139 .cls = &etr_sysclass,
1143 * ETR class attributes
1145 static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf)
1147 return sprintf(buf, "%i\n", etr_port0.esw.p);
1150 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1152 static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf)
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 SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1168 * ETR port attributes
1170 static inline struct etr_aib *etr_aib_from_dev(struct sys_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 sys_device *dev,
1179 struct sysdev_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 sys_device *dev,
1189 struct sysdev_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 SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1228 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1229 struct sysdev_attribute *attr,
1232 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1233 etr_eacr.e0 : etr_eacr.e1);
1236 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1238 static ssize_t etr_mode_code_show(struct sys_device *dev,
1239 struct sysdev_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 SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1250 static ssize_t etr_untuned_show(struct sys_device *dev,
1251 struct sysdev_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 SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1262 static ssize_t etr_network_id_show(struct sys_device *dev,
1263 struct sysdev_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 SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1274 static ssize_t etr_id_show(struct sys_device *dev,
1275 struct sysdev_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 SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1286 static ssize_t etr_port_number_show(struct sys_device *dev,
1287 struct sysdev_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 SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1298 static ssize_t etr_coupled_show(struct sys_device *dev,
1299 struct sysdev_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 SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1310 static ssize_t etr_local_time_show(struct sys_device *dev,
1311 struct sysdev_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 SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1322 static ssize_t etr_utc_offset_show(struct sys_device *dev,
1323 struct sysdev_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 SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1334 static struct sysdev_attribute *etr_port_attributes[] = {
1336 &attr_stepping_control,
1348 static int __init etr_register_port(struct sys_device *dev)
1350 struct sysdev_attribute **attr;
1353 rc = sysdev_register(dev);
1356 for (attr = etr_port_attributes; *attr; attr++) {
1357 rc = sysdev_create_file(dev, *attr);
1363 for (; attr >= etr_port_attributes; attr--)
1364 sysdev_remove_file(dev, *attr);
1365 sysdev_unregister(dev);
1370 static void __init etr_unregister_port(struct sys_device *dev)
1372 struct sysdev_attribute **attr;
1374 for (attr = etr_port_attributes; *attr; attr++)
1375 sysdev_remove_file(dev, *attr);
1376 sysdev_unregister(dev);
1379 static int __init etr_init_sysfs(void)
1383 rc = sysdev_class_register(&etr_sysclass);
1386 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1388 goto out_unreg_class;
1389 rc = sysdev_class_create_file(&etr_sysclass, &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 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1404 out_remove_stepping_port:
1405 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1407 sysdev_class_unregister(&etr_sysclass);
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_clock();
1540 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1542 delta = adjust_time(old_clock, get_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_map);
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 class sysfs interface functions
1609 static struct sysdev_class stp_sysclass = {
1613 static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf)
1617 return sprintf(buf, "%016llx\n",
1618 *(unsigned long long *) stp_info.ctnid);
1621 static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1623 static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf)
1627 return sprintf(buf, "%i\n", stp_info.ctn);
1630 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1632 static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf)
1634 if (!stp_online || !(stp_info.vbits & 0x2000))
1636 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1639 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1641 static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf)
1643 if (!stp_online || !(stp_info.vbits & 0x8000))
1645 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1648 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1650 static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf)
1654 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1657 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1659 static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf)
1661 if (!stp_online || !(stp_info.vbits & 0x0800))
1663 return sprintf(buf, "%i\n", (int) stp_info.tto);
1666 static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1668 static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, char *buf)
1670 if (!stp_online || !(stp_info.vbits & 0x4000))
1672 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1675 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1676 stp_time_zone_offset_show, NULL);
1678 static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf)
1682 return sprintf(buf, "%i\n", stp_info.tmd);
1685 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1687 static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf)
1691 return sprintf(buf, "%i\n", stp_info.tst);
1694 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1696 static ssize_t stp_online_show(struct sysdev_class *class, char *buf)
1698 return sprintf(buf, "%i\n", stp_online);
1701 static ssize_t stp_online_store(struct sysdev_class *class,
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);