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/kernel_stat.h>
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/param.h>
24 #include <linux/string.h>
26 #include <linux/interrupt.h>
27 #include <linux/cpu.h>
28 #include <linux/stop_machine.h>
29 #include <linux/time.h>
30 #include <linux/sysdev.h>
31 #include <linux/delay.h>
32 #include <linux/init.h>
33 #include <linux/smp.h>
34 #include <linux/types.h>
35 #include <linux/profile.h>
36 #include <linux/timex.h>
37 #include <linux/notifier.h>
38 #include <linux/clocksource.h>
39 #include <linux/clockchips.h>
40 #include <linux/gfp.h>
41 #include <linux/kprobes.h>
42 #include <asm/uaccess.h>
43 #include <asm/delay.h>
44 #include <asm/div64.h>
47 #include <asm/irq_regs.h>
48 #include <asm/timer.h>
53 /* change this if you have some constant time drift */
54 #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
55 #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
57 u64 sched_clock_base_cc = -1; /* Force to data section. */
58 EXPORT_SYMBOL_GPL(sched_clock_base_cc);
60 static DEFINE_PER_CPU(struct clock_event_device, comparators);
63 * Scheduler clock - returns current time in nanosec units.
65 unsigned long long notrace __kprobes sched_clock(void)
67 return tod_to_ns(get_clock_monotonic());
71 * Monotonic_clock - returns # of nanoseconds passed since time_init()
73 unsigned long long monotonic_clock(void)
77 EXPORT_SYMBOL(monotonic_clock);
79 void tod_to_timeval(__u64 todval, struct timespec *xt)
81 unsigned long long sec;
86 todval -= (sec * 1000000) << 12;
87 xt->tv_nsec = ((todval * 1000) >> 12);
89 EXPORT_SYMBOL(tod_to_timeval);
91 void clock_comparator_work(void)
93 struct clock_event_device *cd;
95 S390_lowcore.clock_comparator = -1ULL;
96 set_clock_comparator(S390_lowcore.clock_comparator);
97 cd = &__get_cpu_var(comparators);
98 cd->event_handler(cd);
102 * Fixup the clock comparator.
104 static void fixup_clock_comparator(unsigned long long delta)
106 /* If nobody is waiting there's nothing to fix. */
107 if (S390_lowcore.clock_comparator == -1ULL)
109 S390_lowcore.clock_comparator += delta;
110 set_clock_comparator(S390_lowcore.clock_comparator);
113 static int s390_next_ktime(ktime_t expires,
114 struct clock_event_device *evt)
119 ts.tv_sec = ts.tv_nsec = 0;
120 monotonic_to_bootbased(&ts);
121 nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
123 S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
124 set_clock_comparator(S390_lowcore.clock_comparator);
128 static void s390_set_mode(enum clock_event_mode mode,
129 struct clock_event_device *evt)
134 * Set up lowcore and control register of the current cpu to
135 * enable TOD clock and clock comparator interrupts.
137 void init_cpu_timer(void)
139 struct clock_event_device *cd;
142 S390_lowcore.clock_comparator = -1ULL;
143 set_clock_comparator(S390_lowcore.clock_comparator);
145 cpu = smp_processor_id();
146 cd = &per_cpu(comparators, cpu);
147 cd->name = "comparator";
148 cd->features = CLOCK_EVT_FEAT_ONESHOT |
149 CLOCK_EVT_FEAT_KTIME;
152 cd->min_delta_ns = 1;
153 cd->max_delta_ns = LONG_MAX;
155 cd->cpumask = cpumask_of(cpu);
156 cd->set_next_ktime = s390_next_ktime;
157 cd->set_mode = s390_set_mode;
159 clockevents_register_device(cd);
161 /* Enable clock comparator timer interrupt. */
164 /* Always allow the timing alert external interrupt. */
168 static void clock_comparator_interrupt(unsigned int ext_int_code,
169 unsigned int param32,
170 unsigned long param64)
172 kstat_cpu(smp_processor_id()).irqs[EXTINT_CLK]++;
173 if (S390_lowcore.clock_comparator == -1ULL)
174 set_clock_comparator(S390_lowcore.clock_comparator);
177 static void etr_timing_alert(struct etr_irq_parm *);
178 static void stp_timing_alert(struct stp_irq_parm *);
180 static void timing_alert_interrupt(unsigned int ext_int_code,
181 unsigned int param32, unsigned long param64)
183 kstat_cpu(smp_processor_id()).irqs[EXTINT_TLA]++;
184 if (param32 & 0x00c40000)
185 etr_timing_alert((struct etr_irq_parm *) ¶m32);
186 if (param32 & 0x00038000)
187 stp_timing_alert((struct stp_irq_parm *) ¶m32);
190 static void etr_reset(void);
191 static void stp_reset(void);
193 void read_persistent_clock(struct timespec *ts)
195 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
198 void read_boot_clock(struct timespec *ts)
200 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
203 static cycle_t read_tod_clock(struct clocksource *cs)
208 static struct clocksource clocksource_tod = {
211 .read = read_tod_clock,
215 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
218 struct clocksource * __init clocksource_default_clock(void)
220 return &clocksource_tod;
223 void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
224 struct clocksource *clock, u32 mult)
226 if (clock != &clocksource_tod)
229 /* Make userspace gettimeofday spin until we're done. */
230 ++vdso_data->tb_update_count;
232 vdso_data->xtime_tod_stamp = clock->cycle_last;
233 vdso_data->xtime_clock_sec = wall_time->tv_sec;
234 vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
235 vdso_data->wtom_clock_sec = wtm->tv_sec;
236 vdso_data->wtom_clock_nsec = wtm->tv_nsec;
237 vdso_data->ntp_mult = mult;
239 ++vdso_data->tb_update_count;
242 extern struct timezone sys_tz;
244 void update_vsyscall_tz(void)
246 /* Make userspace gettimeofday spin until we're done. */
247 ++vdso_data->tb_update_count;
249 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
250 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
252 ++vdso_data->tb_update_count;
256 * Initialize the TOD clock and the CPU timer of
259 void __init time_init(void)
261 /* Reset time synchronization interfaces. */
265 /* request the clock comparator external interrupt */
266 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
267 panic("Couldn't request external interrupt 0x1004");
269 /* request the timing alert external interrupt */
270 if (register_external_interrupt(0x1406, timing_alert_interrupt))
271 panic("Couldn't request external interrupt 0x1406");
273 if (clocksource_register(&clocksource_tod) != 0)
274 panic("Could not register TOD clock source");
276 /* Enable TOD clock interrupts on the boot cpu. */
279 /* Enable cpu timer interrupts on the boot cpu. */
284 * The time is "clock". old is what we think the time is.
285 * Adjust the value by a multiple of jiffies and add the delta to ntp.
286 * "delay" is an approximation how long the synchronization took. If
287 * the time correction is positive, then "delay" is subtracted from
288 * the time difference and only the remaining part is passed to ntp.
290 static unsigned long long adjust_time(unsigned long long old,
291 unsigned long long clock,
292 unsigned long long delay)
294 unsigned long long delta, ticks;
298 /* It is later than we thought. */
299 delta = ticks = clock - old;
300 delta = ticks = (delta < delay) ? 0 : delta - delay;
301 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
302 adjust.offset = ticks * (1000000 / HZ);
304 /* It is earlier than we thought. */
305 delta = ticks = old - clock;
306 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
308 adjust.offset = -ticks * (1000000 / HZ);
310 sched_clock_base_cc += delta;
311 if (adjust.offset != 0) {
312 pr_notice("The ETR interface has adjusted the clock "
313 "by %li microseconds\n", adjust.offset);
314 adjust.modes = ADJ_OFFSET_SINGLESHOT;
315 do_adjtimex(&adjust);
320 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
321 static DEFINE_MUTEX(clock_sync_mutex);
322 static unsigned long clock_sync_flags;
324 #define CLOCK_SYNC_HAS_ETR 0
325 #define CLOCK_SYNC_HAS_STP 1
326 #define CLOCK_SYNC_ETR 2
327 #define CLOCK_SYNC_STP 3
330 * The synchronous get_clock function. It will write the current clock
331 * value to the clock pointer and return 0 if the clock is in sync with
332 * the external time source. If the clock mode is local it will return
333 * -ENOSYS and -EAGAIN if the clock is not in sync with the external
336 int get_sync_clock(unsigned long long *clock)
339 unsigned int sw0, sw1;
341 sw_ptr = &get_cpu_var(clock_sync_word);
342 sw0 = atomic_read(sw_ptr);
343 *clock = get_clock();
344 sw1 = atomic_read(sw_ptr);
345 put_cpu_var(clock_sync_word);
346 if (sw0 == sw1 && (sw0 & 0x80000000U))
347 /* Success: time is in sync. */
349 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
350 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
352 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
353 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
357 EXPORT_SYMBOL(get_sync_clock);
360 * Make get_sync_clock return -EAGAIN.
362 static void disable_sync_clock(void *dummy)
364 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
366 * Clear the in-sync bit 2^31. All get_sync_clock calls will
367 * fail until the sync bit is turned back on. In addition
368 * increase the "sequence" counter to avoid the race of an
369 * etr event and the complete recovery against get_sync_clock.
371 atomic_clear_mask(0x80000000, sw_ptr);
376 * Make get_sync_clock return 0 again.
377 * Needs to be called from a context disabled for preemption.
379 static void enable_sync_clock(void)
381 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
382 atomic_set_mask(0x80000000, sw_ptr);
386 * Function to check if the clock is in sync.
388 static inline int check_sync_clock(void)
393 sw_ptr = &get_cpu_var(clock_sync_word);
394 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
395 put_cpu_var(clock_sync_word);
399 /* Single threaded workqueue used for etr and stp sync events */
400 static struct workqueue_struct *time_sync_wq;
402 static void __init time_init_wq(void)
406 time_sync_wq = create_singlethread_workqueue("timesync");
410 * External Time Reference (ETR) code.
412 static int etr_port0_online;
413 static int etr_port1_online;
414 static int etr_steai_available;
416 static int __init early_parse_etr(char *p)
418 if (strncmp(p, "off", 3) == 0)
419 etr_port0_online = etr_port1_online = 0;
420 else if (strncmp(p, "port0", 5) == 0)
421 etr_port0_online = 1;
422 else if (strncmp(p, "port1", 5) == 0)
423 etr_port1_online = 1;
424 else if (strncmp(p, "on", 2) == 0)
425 etr_port0_online = etr_port1_online = 1;
428 early_param("etr", early_parse_etr);
431 ETR_EVENT_PORT0_CHANGE,
432 ETR_EVENT_PORT1_CHANGE,
433 ETR_EVENT_PORT_ALERT,
434 ETR_EVENT_SYNC_CHECK,
435 ETR_EVENT_SWITCH_LOCAL,
440 * Valid bit combinations of the eacr register are (x = don't care):
441 * e0 e1 dp p0 p1 ea es sl
442 * 0 0 x 0 0 0 0 0 initial, disabled state
443 * 0 0 x 0 1 1 0 0 port 1 online
444 * 0 0 x 1 0 1 0 0 port 0 online
445 * 0 0 x 1 1 1 0 0 both ports online
446 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
447 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
448 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
449 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
450 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
451 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
452 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
453 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
454 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
455 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
456 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
457 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
458 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
459 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
460 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
461 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
463 static struct etr_eacr etr_eacr;
464 static u64 etr_tolec; /* time of last eacr update */
465 static struct etr_aib etr_port0;
466 static int etr_port0_uptodate;
467 static struct etr_aib etr_port1;
468 static int etr_port1_uptodate;
469 static unsigned long etr_events;
470 static struct timer_list etr_timer;
472 static void etr_timeout(unsigned long dummy);
473 static void etr_work_fn(struct work_struct *work);
474 static DEFINE_MUTEX(etr_work_mutex);
475 static DECLARE_WORK(etr_work, etr_work_fn);
478 * Reset ETR attachment.
480 static void etr_reset(void)
482 etr_eacr = (struct etr_eacr) {
483 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
484 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
486 if (etr_setr(&etr_eacr) == 0) {
487 etr_tolec = get_clock();
488 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
489 if (etr_port0_online && etr_port1_online)
490 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
491 } else if (etr_port0_online || etr_port1_online) {
492 pr_warning("The real or virtual hardware system does "
493 "not provide an ETR interface\n");
494 etr_port0_online = etr_port1_online = 0;
498 static int __init etr_init(void)
502 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
505 /* Check if this machine has the steai instruction. */
506 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
507 etr_steai_available = 1;
508 setup_timer(&etr_timer, etr_timeout, 0UL);
509 if (etr_port0_online) {
510 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
511 queue_work(time_sync_wq, &etr_work);
513 if (etr_port1_online) {
514 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
515 queue_work(time_sync_wq, &etr_work);
520 arch_initcall(etr_init);
523 * Two sorts of ETR machine checks. The architecture reads:
524 * "When a machine-check niterruption occurs and if a switch-to-local or
525 * ETR-sync-check interrupt request is pending but disabled, this pending
526 * disabled interruption request is indicated and is cleared".
527 * Which means that we can get etr_switch_to_local events from the machine
528 * check handler although the interruption condition is disabled. Lovely..
532 * Switch to local machine check. This is called when the last usable
533 * ETR port goes inactive. After switch to local the clock is not in sync.
535 void etr_switch_to_local(void)
539 disable_sync_clock(NULL);
540 if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) {
541 etr_eacr.es = etr_eacr.sl = 0;
543 queue_work(time_sync_wq, &etr_work);
548 * ETR sync check machine check. This is called when the ETR OTE and the
549 * local clock OTE are farther apart than the ETR sync check tolerance.
550 * After a ETR sync check the clock is not in sync. The machine check
551 * is broadcasted to all cpus at the same time.
553 void etr_sync_check(void)
557 disable_sync_clock(NULL);
558 if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) {
561 queue_work(time_sync_wq, &etr_work);
566 * ETR timing alert. There are two causes:
567 * 1) port state change, check the usability of the port
568 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
569 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
570 * or ETR-data word 4 (edf4) has changed.
572 static void etr_timing_alert(struct etr_irq_parm *intparm)
575 /* ETR port 0 state change. */
576 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
578 /* ETR port 1 state change. */
579 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
582 * ETR port alert on either port 0, 1 or both.
583 * Both ports are not up-to-date now.
585 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
586 queue_work(time_sync_wq, &etr_work);
589 static void etr_timeout(unsigned long dummy)
591 set_bit(ETR_EVENT_UPDATE, &etr_events);
592 queue_work(time_sync_wq, &etr_work);
596 * Check if the etr mode is pss.
598 static inline int etr_mode_is_pps(struct etr_eacr eacr)
600 return eacr.es && !eacr.sl;
604 * Check if the etr mode is etr.
606 static inline int etr_mode_is_etr(struct etr_eacr eacr)
608 return eacr.es && eacr.sl;
612 * Check if the port can be used for TOD synchronization.
613 * For PPS mode the port has to receive OTEs. For ETR mode
614 * the port has to receive OTEs, the ETR stepping bit has to
615 * be zero and the validity bits for data frame 1, 2, and 3
618 static int etr_port_valid(struct etr_aib *aib, int port)
622 /* Check that this port is receiving OTEs. */
626 psc = port ? aib->esw.psc1 : aib->esw.psc0;
627 if (psc == etr_lpsc_pps_mode)
629 if (psc == etr_lpsc_operational_step)
630 return !aib->esw.y && aib->slsw.v1 &&
631 aib->slsw.v2 && aib->slsw.v3;
636 * Check if two ports are on the same network.
638 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
640 // FIXME: any other fields we have to compare?
641 return aib1->edf1.net_id == aib2->edf1.net_id;
645 * Wrapper for etr_stei that converts physical port states
646 * to logical port states to be consistent with the output
647 * of stetr (see etr_psc vs. etr_lpsc).
649 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
651 BUG_ON(etr_steai(aib, func) != 0);
652 /* Convert port state to logical port state. */
653 if (aib->esw.psc0 == 1)
655 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
657 if (aib->esw.psc1 == 1)
659 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
664 * Check if the aib a2 is still connected to the same attachment as
665 * aib a1, the etv values differ by one and a2 is valid.
667 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
669 int state_a1, state_a2;
671 /* Paranoia check: e0/e1 should better be the same. */
672 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
673 a1->esw.eacr.e1 != a2->esw.eacr.e1)
676 /* Still connected to the same etr ? */
677 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
678 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
679 if (state_a1 == etr_lpsc_operational_step) {
680 if (state_a2 != etr_lpsc_operational_step ||
681 a1->edf1.net_id != a2->edf1.net_id ||
682 a1->edf1.etr_id != a2->edf1.etr_id ||
683 a1->edf1.etr_pn != a2->edf1.etr_pn)
685 } else if (state_a2 != etr_lpsc_pps_mode)
688 /* The ETV value of a2 needs to be ETV of a1 + 1. */
689 if (a1->edf2.etv + 1 != a2->edf2.etv)
692 if (!etr_port_valid(a2, p))
698 struct clock_sync_data {
701 unsigned long long fixup_cc;
703 struct etr_aib *etr_aib;
706 static void clock_sync_cpu(struct clock_sync_data *sync)
708 atomic_dec(&sync->cpus);
711 * This looks like a busy wait loop but it isn't. etr_sync_cpus
712 * is called on all other cpus while the TOD clocks is stopped.
713 * __udelay will stop the cpu on an enabled wait psw until the
714 * TOD is running again.
716 while (sync->in_sync == 0) {
719 * A different cpu changes *in_sync. Therefore use
720 * barrier() to force memory access.
724 if (sync->in_sync != 1)
725 /* Didn't work. Clear per-cpu in sync bit again. */
726 disable_sync_clock(NULL);
728 * This round of TOD syncing is done. Set the clock comparator
729 * to the next tick and let the processor continue.
731 fixup_clock_comparator(sync->fixup_cc);
735 * Sync the TOD clock using the port referred to by aibp. This port
736 * has to be enabled and the other port has to be disabled. The
737 * last eacr update has to be more than 1.6 seconds in the past.
739 static int etr_sync_clock(void *data)
742 unsigned long long clock, old_clock, delay, delta;
743 struct clock_sync_data *etr_sync;
744 struct etr_aib *sync_port, *aib;
750 if (xchg(&first, 1) == 1) {
752 clock_sync_cpu(etr_sync);
756 /* Wait until all other cpus entered the sync function. */
757 while (atomic_read(&etr_sync->cpus) != 0)
760 port = etr_sync->etr_port;
761 aib = etr_sync->etr_aib;
762 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
765 /* Set clock to next OTE. */
766 __ctl_set_bit(14, 21);
767 __ctl_set_bit(0, 29);
768 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
769 old_clock = get_clock();
770 if (set_clock(clock) == 0) {
771 __udelay(1); /* Wait for the clock to start. */
772 __ctl_clear_bit(0, 29);
773 __ctl_clear_bit(14, 21);
775 /* Adjust Linux timing variables. */
776 delay = (unsigned long long)
777 (aib->edf2.etv - sync_port->edf2.etv) << 32;
778 delta = adjust_time(old_clock, clock, delay);
779 etr_sync->fixup_cc = delta;
780 fixup_clock_comparator(delta);
781 /* Verify that the clock is properly set. */
782 if (!etr_aib_follows(sync_port, aib, port)) {
784 disable_sync_clock(NULL);
785 etr_sync->in_sync = -EAGAIN;
788 etr_sync->in_sync = 1;
792 /* Could not set the clock ?!? */
793 __ctl_clear_bit(0, 29);
794 __ctl_clear_bit(14, 21);
795 disable_sync_clock(NULL);
796 etr_sync->in_sync = -EAGAIN;
803 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
805 struct clock_sync_data etr_sync;
806 struct etr_aib *sync_port;
810 /* Check if the current aib is adjacent to the sync port aib. */
811 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
812 follows = etr_aib_follows(sync_port, aib, port);
813 memcpy(sync_port, aib, sizeof(*aib));
816 memset(&etr_sync, 0, sizeof(etr_sync));
817 etr_sync.etr_aib = aib;
818 etr_sync.etr_port = port;
820 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
821 rc = stop_machine(etr_sync_clock, &etr_sync, cpu_online_mask);
827 * Handle the immediate effects of the different events.
828 * The port change event is used for online/offline changes.
830 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
832 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
834 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
835 eacr.es = eacr.sl = 0;
836 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
837 etr_port0_uptodate = etr_port1_uptodate = 0;
839 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
842 * Port change of an enabled port. We have to
843 * assume that this can have caused an stepping
846 etr_tolec = get_clock();
847 eacr.p0 = etr_port0_online;
850 etr_port0_uptodate = 0;
852 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
855 * Port change of an enabled port. We have to
856 * assume that this can have caused an stepping
859 etr_tolec = get_clock();
860 eacr.p1 = etr_port1_online;
863 etr_port1_uptodate = 0;
865 clear_bit(ETR_EVENT_UPDATE, &etr_events);
870 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
871 * one of the ports needs an update.
873 static void etr_set_tolec_timeout(unsigned long long now)
875 unsigned long micros;
877 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
878 (!etr_eacr.p1 || etr_port1_uptodate))
880 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
881 micros = (micros > 1600000) ? 0 : 1600000 - micros;
882 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
886 * Set up a time that expires after 1/2 second.
888 static void etr_set_sync_timeout(void)
890 mod_timer(&etr_timer, jiffies + HZ/2);
894 * Update the aib information for one or both ports.
896 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
897 struct etr_eacr eacr)
899 /* With both ports disabled the aib information is useless. */
900 if (!eacr.e0 && !eacr.e1)
903 /* Update port0 or port1 with aib stored in etr_work_fn. */
904 if (aib->esw.q == 0) {
905 /* Information for port 0 stored. */
906 if (eacr.p0 && !etr_port0_uptodate) {
908 if (etr_port0_online)
909 etr_port0_uptodate = 1;
912 /* Information for port 1 stored. */
913 if (eacr.p1 && !etr_port1_uptodate) {
915 if (etr_port0_online)
916 etr_port1_uptodate = 1;
921 * Do not try to get the alternate port aib if the clock
922 * is not in sync yet.
924 if (!eacr.es || !check_sync_clock())
928 * If steai is available we can get the information about
929 * the other port immediately. If only stetr is available the
930 * data-port bit toggle has to be used.
932 if (etr_steai_available) {
933 if (eacr.p0 && !etr_port0_uptodate) {
934 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
935 etr_port0_uptodate = 1;
937 if (eacr.p1 && !etr_port1_uptodate) {
938 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
939 etr_port1_uptodate = 1;
943 * One port was updated above, if the other
944 * port is not uptodate toggle dp bit.
946 if ((eacr.p0 && !etr_port0_uptodate) ||
947 (eacr.p1 && !etr_port1_uptodate))
956 * Write new etr control register if it differs from the current one.
957 * Return 1 if etr_tolec has been updated as well.
959 static void etr_update_eacr(struct etr_eacr eacr)
963 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
964 /* No change, return. */
967 * The disable of an active port of the change of the data port
968 * bit can/will cause a change in the data port.
970 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
971 (etr_eacr.dp ^ eacr.dp) != 0;
975 etr_tolec = get_clock();
979 * ETR work. In this function you'll find the main logic. In
980 * particular this is the only function that calls etr_update_eacr(),
981 * it "controls" the etr control register.
983 static void etr_work_fn(struct work_struct *work)
985 unsigned long long now;
986 struct etr_eacr eacr;
990 /* prevent multiple execution. */
991 mutex_lock(&etr_work_mutex);
993 /* Create working copy of etr_eacr. */
996 /* Check for the different events and their immediate effects. */
997 eacr = etr_handle_events(eacr);
999 /* Check if ETR is supposed to be active. */
1000 eacr.ea = eacr.p0 || eacr.p1;
1002 /* Both ports offline. Reset everything. */
1003 eacr.dp = eacr.es = eacr.sl = 0;
1004 on_each_cpu(disable_sync_clock, NULL, 1);
1005 del_timer_sync(&etr_timer);
1006 etr_update_eacr(eacr);
1010 /* Store aib to get the current ETR status word. */
1011 BUG_ON(etr_stetr(&aib) != 0);
1012 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
1016 * Update the port information if the last stepping port change
1017 * or data port change is older than 1.6 seconds.
1019 if (now >= etr_tolec + (1600000 << 12))
1020 eacr = etr_handle_update(&aib, eacr);
1023 * Select ports to enable. The preferred synchronization mode is PPS.
1024 * If a port can be enabled depends on a number of things:
1025 * 1) The port needs to be online and uptodate. A port is not
1026 * disabled just because it is not uptodate, but it is only
1027 * enabled if it is uptodate.
1028 * 2) The port needs to have the same mode (pps / etr).
1029 * 3) The port needs to be usable -> etr_port_valid() == 1
1030 * 4) To enable the second port the clock needs to be in sync.
1031 * 5) If both ports are useable and are ETR ports, the network id
1032 * has to be the same.
1033 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1035 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1038 if (!etr_mode_is_pps(etr_eacr))
1040 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1042 // FIXME: uptodate checks ?
1043 else if (etr_port0_uptodate && etr_port1_uptodate)
1045 sync_port = (etr_port0_uptodate &&
1046 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1047 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1051 if (!etr_mode_is_pps(etr_eacr))
1053 sync_port = (etr_port1_uptodate &&
1054 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1055 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1058 if (!etr_mode_is_etr(etr_eacr))
1060 if (!eacr.es || !eacr.p1 ||
1061 aib.esw.psc1 != etr_lpsc_operational_alt)
1063 else if (etr_port0_uptodate && etr_port1_uptodate &&
1064 etr_compare_network(&etr_port0, &etr_port1))
1066 sync_port = (etr_port0_uptodate &&
1067 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1068 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1072 if (!etr_mode_is_etr(etr_eacr))
1074 sync_port = (etr_port1_uptodate &&
1075 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1077 /* Both ports not usable. */
1078 eacr.es = eacr.sl = 0;
1083 * If the clock is in sync just update the eacr and return.
1084 * If there is no valid sync port wait for a port update.
1086 if ((eacr.es && check_sync_clock()) || sync_port < 0) {
1087 etr_update_eacr(eacr);
1088 etr_set_tolec_timeout(now);
1093 * Prepare control register for clock syncing
1094 * (reset data port bit, set sync check control.
1100 * Update eacr and try to synchronize the clock. If the update
1101 * of eacr caused a stepping port switch (or if we have to
1102 * assume that a stepping port switch has occurred) or the
1103 * clock syncing failed, reset the sync check control bit
1104 * and set up a timer to try again after 0.5 seconds
1106 etr_update_eacr(eacr);
1107 if (now < etr_tolec + (1600000 << 12) ||
1108 etr_sync_clock_stop(&aib, sync_port) != 0) {
1109 /* Sync failed. Try again in 1/2 second. */
1111 etr_update_eacr(eacr);
1112 etr_set_sync_timeout();
1114 etr_set_tolec_timeout(now);
1116 mutex_unlock(&etr_work_mutex);
1120 * Sysfs interface functions
1122 static struct sysdev_class etr_sysclass = {
1126 static struct sys_device etr_port0_dev = {
1128 .cls = &etr_sysclass,
1131 static struct sys_device etr_port1_dev = {
1133 .cls = &etr_sysclass,
1137 * ETR class attributes
1139 static ssize_t etr_stepping_port_show(struct sysdev_class *class,
1140 struct sysdev_class_attribute *attr,
1143 return sprintf(buf, "%i\n", etr_port0.esw.p);
1146 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1148 static ssize_t etr_stepping_mode_show(struct sysdev_class *class,
1149 struct sysdev_class_attribute *attr,
1154 if (etr_mode_is_pps(etr_eacr))
1156 else if (etr_mode_is_etr(etr_eacr))
1160 return sprintf(buf, "%s\n", mode_str);
1163 static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1166 * ETR port attributes
1168 static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1170 if (dev == &etr_port0_dev)
1171 return etr_port0_online ? &etr_port0 : NULL;
1173 return etr_port1_online ? &etr_port1 : NULL;
1176 static ssize_t etr_online_show(struct sys_device *dev,
1177 struct sysdev_attribute *attr,
1180 unsigned int online;
1182 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1183 return sprintf(buf, "%i\n", online);
1186 static ssize_t etr_online_store(struct sys_device *dev,
1187 struct sysdev_attribute *attr,
1188 const char *buf, size_t count)
1192 value = simple_strtoul(buf, NULL, 0);
1193 if (value != 0 && value != 1)
1195 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1197 mutex_lock(&clock_sync_mutex);
1198 if (dev == &etr_port0_dev) {
1199 if (etr_port0_online == value)
1200 goto out; /* Nothing to do. */
1201 etr_port0_online = value;
1202 if (etr_port0_online && etr_port1_online)
1203 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1205 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1206 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1207 queue_work(time_sync_wq, &etr_work);
1209 if (etr_port1_online == value)
1210 goto out; /* Nothing to do. */
1211 etr_port1_online = value;
1212 if (etr_port0_online && etr_port1_online)
1213 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1215 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1216 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1217 queue_work(time_sync_wq, &etr_work);
1220 mutex_unlock(&clock_sync_mutex);
1224 static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1226 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1227 struct sysdev_attribute *attr,
1230 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1231 etr_eacr.e0 : etr_eacr.e1);
1234 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1236 static ssize_t etr_mode_code_show(struct sys_device *dev,
1237 struct sysdev_attribute *attr, char *buf)
1239 if (!etr_port0_online && !etr_port1_online)
1240 /* Status word is not uptodate if both ports are offline. */
1242 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1243 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1246 static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1248 static ssize_t etr_untuned_show(struct sys_device *dev,
1249 struct sysdev_attribute *attr, char *buf)
1251 struct etr_aib *aib = etr_aib_from_dev(dev);
1253 if (!aib || !aib->slsw.v1)
1255 return sprintf(buf, "%i\n", aib->edf1.u);
1258 static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1260 static ssize_t etr_network_id_show(struct sys_device *dev,
1261 struct sysdev_attribute *attr, char *buf)
1263 struct etr_aib *aib = etr_aib_from_dev(dev);
1265 if (!aib || !aib->slsw.v1)
1267 return sprintf(buf, "%i\n", aib->edf1.net_id);
1270 static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1272 static ssize_t etr_id_show(struct sys_device *dev,
1273 struct sysdev_attribute *attr, char *buf)
1275 struct etr_aib *aib = etr_aib_from_dev(dev);
1277 if (!aib || !aib->slsw.v1)
1279 return sprintf(buf, "%i\n", aib->edf1.etr_id);
1282 static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1284 static ssize_t etr_port_number_show(struct sys_device *dev,
1285 struct sysdev_attribute *attr, char *buf)
1287 struct etr_aib *aib = etr_aib_from_dev(dev);
1289 if (!aib || !aib->slsw.v1)
1291 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1294 static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1296 static ssize_t etr_coupled_show(struct sys_device *dev,
1297 struct sysdev_attribute *attr, char *buf)
1299 struct etr_aib *aib = etr_aib_from_dev(dev);
1301 if (!aib || !aib->slsw.v3)
1303 return sprintf(buf, "%i\n", aib->edf3.c);
1306 static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1308 static ssize_t etr_local_time_show(struct sys_device *dev,
1309 struct sysdev_attribute *attr, char *buf)
1311 struct etr_aib *aib = etr_aib_from_dev(dev);
1313 if (!aib || !aib->slsw.v3)
1315 return sprintf(buf, "%i\n", aib->edf3.blto);
1318 static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1320 static ssize_t etr_utc_offset_show(struct sys_device *dev,
1321 struct sysdev_attribute *attr, char *buf)
1323 struct etr_aib *aib = etr_aib_from_dev(dev);
1325 if (!aib || !aib->slsw.v3)
1327 return sprintf(buf, "%i\n", aib->edf3.buo);
1330 static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1332 static struct sysdev_attribute *etr_port_attributes[] = {
1334 &attr_stepping_control,
1346 static int __init etr_register_port(struct sys_device *dev)
1348 struct sysdev_attribute **attr;
1351 rc = sysdev_register(dev);
1354 for (attr = etr_port_attributes; *attr; attr++) {
1355 rc = sysdev_create_file(dev, *attr);
1361 for (; attr >= etr_port_attributes; attr--)
1362 sysdev_remove_file(dev, *attr);
1363 sysdev_unregister(dev);
1368 static void __init etr_unregister_port(struct sys_device *dev)
1370 struct sysdev_attribute **attr;
1372 for (attr = etr_port_attributes; *attr; attr++)
1373 sysdev_remove_file(dev, *attr);
1374 sysdev_unregister(dev);
1377 static int __init etr_init_sysfs(void)
1381 rc = sysdev_class_register(&etr_sysclass);
1384 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1386 goto out_unreg_class;
1387 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1389 goto out_remove_stepping_port;
1390 rc = etr_register_port(&etr_port0_dev);
1392 goto out_remove_stepping_mode;
1393 rc = etr_register_port(&etr_port1_dev);
1395 goto out_remove_port0;
1399 etr_unregister_port(&etr_port0_dev);
1400 out_remove_stepping_mode:
1401 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1402 out_remove_stepping_port:
1403 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1405 sysdev_class_unregister(&etr_sysclass);
1410 device_initcall(etr_init_sysfs);
1413 * Server Time Protocol (STP) code.
1415 static int stp_online;
1416 static struct stp_sstpi stp_info;
1417 static void *stp_page;
1419 static void stp_work_fn(struct work_struct *work);
1420 static DEFINE_MUTEX(stp_work_mutex);
1421 static DECLARE_WORK(stp_work, stp_work_fn);
1422 static struct timer_list stp_timer;
1424 static int __init early_parse_stp(char *p)
1426 if (strncmp(p, "off", 3) == 0)
1428 else if (strncmp(p, "on", 2) == 0)
1432 early_param("stp", early_parse_stp);
1435 * Reset STP attachment.
1437 static void __init stp_reset(void)
1441 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1442 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1444 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1445 else if (stp_online) {
1446 pr_warning("The real or virtual hardware system does "
1447 "not provide an STP interface\n");
1448 free_page((unsigned long) stp_page);
1454 static void stp_timeout(unsigned long dummy)
1456 queue_work(time_sync_wq, &stp_work);
1459 static int __init stp_init(void)
1461 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1463 setup_timer(&stp_timer, stp_timeout, 0UL);
1467 queue_work(time_sync_wq, &stp_work);
1471 arch_initcall(stp_init);
1474 * STP timing alert. There are three causes:
1475 * 1) timing status change
1476 * 2) link availability change
1477 * 3) time control parameter change
1478 * In all three cases we are only interested in the clock source state.
1479 * If a STP clock source is now available use it.
1481 static void stp_timing_alert(struct stp_irq_parm *intparm)
1483 if (intparm->tsc || intparm->lac || intparm->tcpc)
1484 queue_work(time_sync_wq, &stp_work);
1488 * STP sync check machine check. This is called when the timing state
1489 * changes from the synchronized state to the unsynchronized state.
1490 * After a STP sync check the clock is not in sync. The machine check
1491 * is broadcasted to all cpus at the same time.
1493 void stp_sync_check(void)
1495 disable_sync_clock(NULL);
1496 queue_work(time_sync_wq, &stp_work);
1500 * STP island condition machine check. This is called when an attached
1501 * server attempts to communicate over an STP link and the servers
1502 * have matching CTN ids and have a valid stratum-1 configuration
1503 * but the configurations do not match.
1505 void stp_island_check(void)
1507 disable_sync_clock(NULL);
1508 queue_work(time_sync_wq, &stp_work);
1512 static int stp_sync_clock(void *data)
1515 unsigned long long old_clock, delta;
1516 struct clock_sync_data *stp_sync;
1521 if (xchg(&first, 1) == 1) {
1523 clock_sync_cpu(stp_sync);
1527 /* Wait until all other cpus entered the sync function. */
1528 while (atomic_read(&stp_sync->cpus) != 0)
1531 enable_sync_clock();
1534 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1535 stp_info.todoff[2] || stp_info.todoff[3] ||
1536 stp_info.tmd != 2) {
1537 old_clock = get_clock();
1538 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1540 delta = adjust_time(old_clock, get_clock(), 0);
1541 fixup_clock_comparator(delta);
1542 rc = chsc_sstpi(stp_page, &stp_info,
1543 sizeof(struct stp_sstpi));
1544 if (rc == 0 && stp_info.tmd != 2)
1549 disable_sync_clock(NULL);
1550 stp_sync->in_sync = -EAGAIN;
1552 stp_sync->in_sync = 1;
1558 * STP work. Check for the STP state and take over the clock
1559 * synchronization if the STP clock source is usable.
1561 static void stp_work_fn(struct work_struct *work)
1563 struct clock_sync_data stp_sync;
1566 /* prevent multiple execution. */
1567 mutex_lock(&stp_work_mutex);
1570 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1571 del_timer_sync(&stp_timer);
1575 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1579 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1580 if (rc || stp_info.c == 0)
1583 /* Skip synchronization if the clock is already in sync. */
1584 if (check_sync_clock())
1587 memset(&stp_sync, 0, sizeof(stp_sync));
1589 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1590 stop_machine(stp_sync_clock, &stp_sync, cpu_online_mask);
1593 if (!check_sync_clock())
1595 * There is a usable clock but the synchonization failed.
1596 * Retry after a second.
1598 mod_timer(&stp_timer, jiffies + HZ);
1601 mutex_unlock(&stp_work_mutex);
1605 * STP class sysfs interface functions
1607 static struct sysdev_class stp_sysclass = {
1611 static ssize_t stp_ctn_id_show(struct sysdev_class *class,
1612 struct sysdev_class_attribute *attr,
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,
1624 struct sysdev_class_attribute *attr,
1629 return sprintf(buf, "%i\n", stp_info.ctn);
1632 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1634 static ssize_t stp_dst_offset_show(struct sysdev_class *class,
1635 struct sysdev_class_attribute *attr,
1638 if (!stp_online || !(stp_info.vbits & 0x2000))
1640 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1643 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1645 static ssize_t stp_leap_seconds_show(struct sysdev_class *class,
1646 struct sysdev_class_attribute *attr,
1649 if (!stp_online || !(stp_info.vbits & 0x8000))
1651 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1654 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1656 static ssize_t stp_stratum_show(struct sysdev_class *class,
1657 struct sysdev_class_attribute *attr,
1662 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1665 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1667 static ssize_t stp_time_offset_show(struct sysdev_class *class,
1668 struct sysdev_class_attribute *attr,
1671 if (!stp_online || !(stp_info.vbits & 0x0800))
1673 return sprintf(buf, "%i\n", (int) stp_info.tto);
1676 static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1678 static ssize_t stp_time_zone_offset_show(struct sysdev_class *class,
1679 struct sysdev_class_attribute *attr,
1682 if (!stp_online || !(stp_info.vbits & 0x4000))
1684 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1687 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1688 stp_time_zone_offset_show, NULL);
1690 static ssize_t stp_timing_mode_show(struct sysdev_class *class,
1691 struct sysdev_class_attribute *attr,
1696 return sprintf(buf, "%i\n", stp_info.tmd);
1699 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1701 static ssize_t stp_timing_state_show(struct sysdev_class *class,
1702 struct sysdev_class_attribute *attr,
1707 return sprintf(buf, "%i\n", stp_info.tst);
1710 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1712 static ssize_t stp_online_show(struct sysdev_class *class,
1713 struct sysdev_class_attribute *attr,
1716 return sprintf(buf, "%i\n", stp_online);
1719 static ssize_t stp_online_store(struct sysdev_class *class,
1720 struct sysdev_class_attribute *attr,
1721 const char *buf, size_t count)
1725 value = simple_strtoul(buf, NULL, 0);
1726 if (value != 0 && value != 1)
1728 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1730 mutex_lock(&clock_sync_mutex);
1733 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1735 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1736 queue_work(time_sync_wq, &stp_work);
1737 mutex_unlock(&clock_sync_mutex);
1742 * Can't use SYSDEV_CLASS_ATTR because the attribute should be named
1743 * stp/online but attr_online already exists in this file ..
1745 static struct sysdev_class_attribute attr_stp_online = {
1746 .attr = { .name = "online", .mode = 0600 },
1747 .show = stp_online_show,
1748 .store = stp_online_store,
1751 static struct sysdev_class_attribute *stp_attributes[] = {
1759 &attr_time_zone_offset,
1765 static int __init stp_init_sysfs(void)
1767 struct sysdev_class_attribute **attr;
1770 rc = sysdev_class_register(&stp_sysclass);
1773 for (attr = stp_attributes; *attr; attr++) {
1774 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1780 for (; attr >= stp_attributes; attr--)
1781 sysdev_class_remove_file(&stp_sysclass, *attr);
1782 sysdev_class_unregister(&stp_sysclass);
1787 device_initcall(stp_init_sysfs);