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/bootmem.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)
56 * Create a small time difference between the timer interrupts
57 * on the different cpus to avoid lock contention.
59 #define CPU_DEVIATION (smp_processor_id() << 12)
61 #define TICK_SIZE tick
63 u64 sched_clock_base_cc = -1; /* Force to data section. */
65 static ext_int_info_t ext_int_info_cc;
66 static ext_int_info_t ext_int_etr_cc;
68 static DEFINE_PER_CPU(struct clock_event_device, comparators);
71 * Scheduler clock - returns current time in nanosec units.
73 unsigned long long sched_clock(void)
75 return ((get_clock_xt() - sched_clock_base_cc) * 125) >> 9;
79 * Monotonic_clock - returns # of nanoseconds passed since time_init()
81 unsigned long long monotonic_clock(void)
85 EXPORT_SYMBOL(monotonic_clock);
87 void tod_to_timeval(__u64 todval, struct timespec *xtime)
89 unsigned long long sec;
94 todval -= (sec * 1000000) << 12;
95 xtime->tv_nsec = ((todval * 1000) >> 12);
98 #ifdef CONFIG_PROFILING
99 #define s390_do_profile() profile_tick(CPU_PROFILING)
101 #define s390_do_profile() do { ; } while(0)
102 #endif /* CONFIG_PROFILING */
104 void clock_comparator_work(void)
106 struct clock_event_device *cd;
108 S390_lowcore.clock_comparator = -1ULL;
109 set_clock_comparator(S390_lowcore.clock_comparator);
110 cd = &__get_cpu_var(comparators);
111 cd->event_handler(cd);
116 * Fixup the clock comparator.
118 static void fixup_clock_comparator(unsigned long long delta)
120 /* If nobody is waiting there's nothing to fix. */
121 if (S390_lowcore.clock_comparator == -1ULL)
123 S390_lowcore.clock_comparator += delta;
124 set_clock_comparator(S390_lowcore.clock_comparator);
127 static int s390_next_event(unsigned long delta,
128 struct clock_event_device *evt)
130 S390_lowcore.clock_comparator = get_clock() + delta;
131 set_clock_comparator(S390_lowcore.clock_comparator);
135 static void s390_set_mode(enum clock_event_mode mode,
136 struct clock_event_device *evt)
141 * Set up lowcore and control register of the current cpu to
142 * enable TOD clock and clock comparator interrupts.
144 void init_cpu_timer(void)
146 struct clock_event_device *cd;
149 S390_lowcore.clock_comparator = -1ULL;
150 set_clock_comparator(S390_lowcore.clock_comparator);
152 cpu = smp_processor_id();
153 cd = &per_cpu(comparators, cpu);
154 cd->name = "comparator";
155 cd->features = CLOCK_EVT_FEAT_ONESHOT;
158 cd->min_delta_ns = 1;
159 cd->max_delta_ns = LONG_MAX;
161 cd->cpumask = cpumask_of(cpu);
162 cd->set_next_event = s390_next_event;
163 cd->set_mode = s390_set_mode;
165 clockevents_register_device(cd);
167 /* Enable clock comparator timer interrupt. */
170 /* Always allow the timing alert external interrupt. */
174 static void clock_comparator_interrupt(__u16 code)
176 if (S390_lowcore.clock_comparator == -1ULL)
177 set_clock_comparator(S390_lowcore.clock_comparator);
180 static void etr_timing_alert(struct etr_irq_parm *);
181 static void stp_timing_alert(struct stp_irq_parm *);
183 static void timing_alert_interrupt(__u16 code)
185 if (S390_lowcore.ext_params & 0x00c40000)
186 etr_timing_alert((struct etr_irq_parm *)
187 &S390_lowcore.ext_params);
188 if (S390_lowcore.ext_params & 0x00038000)
189 stp_timing_alert((struct stp_irq_parm *)
190 &S390_lowcore.ext_params);
193 static void etr_reset(void);
194 static void stp_reset(void);
196 unsigned long read_persistent_clock(void)
200 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, &ts);
204 static cycle_t read_tod_clock(void)
209 static struct clocksource clocksource_tod = {
212 .read = read_tod_clock,
216 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
220 void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
222 if (clock != &clocksource_tod)
225 /* Make userspace gettimeofday spin until we're done. */
226 ++vdso_data->tb_update_count;
228 vdso_data->xtime_tod_stamp = clock->cycle_last;
229 vdso_data->xtime_clock_sec = xtime.tv_sec;
230 vdso_data->xtime_clock_nsec = xtime.tv_nsec;
231 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
232 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
234 ++vdso_data->tb_update_count;
237 extern struct timezone sys_tz;
239 void update_vsyscall_tz(void)
241 /* Make userspace gettimeofday spin until we're done. */
242 ++vdso_data->tb_update_count;
244 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
245 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
247 ++vdso_data->tb_update_count;
251 * Initialize the TOD clock and the CPU timer of
254 void __init time_init(void)
256 /* Reset time synchronization interfaces. */
261 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &xtime);
262 set_normalized_timespec(&wall_to_monotonic,
263 -xtime.tv_sec, -xtime.tv_nsec);
265 /* request the clock comparator external interrupt */
266 if (register_early_external_interrupt(0x1004,
267 clock_comparator_interrupt,
268 &ext_int_info_cc) != 0)
269 panic("Couldn't request external interrupt 0x1004");
271 if (clocksource_register(&clocksource_tod) != 0)
272 panic("Could not register TOD clock source");
274 /* request the timing alert external interrupt */
275 if (register_early_external_interrupt(0x1406,
276 timing_alert_interrupt,
277 &ext_int_etr_cc) != 0)
278 panic("Couldn't request external interrupt 0x1406");
280 /* Enable TOD clock interrupts on the boot cpu. */
282 /* Enable cpu timer interrupts on the boot cpu. */
287 * The time is "clock". old is what we think the time is.
288 * Adjust the value by a multiple of jiffies and add the delta to ntp.
289 * "delay" is an approximation how long the synchronization took. If
290 * the time correction is positive, then "delay" is subtracted from
291 * the time difference and only the remaining part is passed to ntp.
293 static unsigned long long adjust_time(unsigned long long old,
294 unsigned long long clock,
295 unsigned long long delay)
297 unsigned long long delta, ticks;
301 /* It is later than we thought. */
302 delta = ticks = clock - old;
303 delta = ticks = (delta < delay) ? 0 : delta - delay;
304 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
305 adjust.offset = ticks * (1000000 / HZ);
307 /* It is earlier than we thought. */
308 delta = ticks = old - clock;
309 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
311 adjust.offset = -ticks * (1000000 / HZ);
313 sched_clock_base_cc += delta;
314 if (adjust.offset != 0) {
315 pr_notice("The ETR interface has adjusted the clock "
316 "by %li microseconds\n", adjust.offset);
317 adjust.modes = ADJ_OFFSET_SINGLESHOT;
318 do_adjtimex(&adjust);
323 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
324 static DEFINE_MUTEX(clock_sync_mutex);
325 static unsigned long clock_sync_flags;
327 #define CLOCK_SYNC_HAS_ETR 0
328 #define CLOCK_SYNC_HAS_STP 1
329 #define CLOCK_SYNC_ETR 2
330 #define CLOCK_SYNC_STP 3
333 * The synchronous get_clock function. It will write the current clock
334 * value to the clock pointer and return 0 if the clock is in sync with
335 * the external time source. If the clock mode is local it will return
336 * -ENOSYS and -EAGAIN if the clock is not in sync with the external
339 int get_sync_clock(unsigned long long *clock)
342 unsigned int sw0, sw1;
344 sw_ptr = &get_cpu_var(clock_sync_word);
345 sw0 = atomic_read(sw_ptr);
346 *clock = get_clock();
347 sw1 = atomic_read(sw_ptr);
348 put_cpu_var(clock_sync_sync);
349 if (sw0 == sw1 && (sw0 & 0x80000000U))
350 /* Success: time is in sync. */
352 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
353 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
355 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
356 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
360 EXPORT_SYMBOL(get_sync_clock);
363 * Make get_sync_clock return -EAGAIN.
365 static void disable_sync_clock(void *dummy)
367 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
369 * Clear the in-sync bit 2^31. All get_sync_clock calls will
370 * fail until the sync bit is turned back on. In addition
371 * increase the "sequence" counter to avoid the race of an
372 * etr event and the complete recovery against get_sync_clock.
374 atomic_clear_mask(0x80000000, sw_ptr);
379 * Make get_sync_clock return 0 again.
380 * Needs to be called from a context disabled for preemption.
382 static void enable_sync_clock(void)
384 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
385 atomic_set_mask(0x80000000, sw_ptr);
389 * Function to check if the clock is in sync.
391 static inline int check_sync_clock(void)
396 sw_ptr = &get_cpu_var(clock_sync_word);
397 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
398 put_cpu_var(clock_sync_sync);
402 /* Single threaded workqueue used for etr and stp sync events */
403 static struct workqueue_struct *time_sync_wq;
405 static void __init time_init_wq(void)
409 time_sync_wq = create_singlethread_workqueue("timesync");
410 stop_machine_create();
414 * External Time Reference (ETR) code.
416 static int etr_port0_online;
417 static int etr_port1_online;
418 static int etr_steai_available;
420 static int __init early_parse_etr(char *p)
422 if (strncmp(p, "off", 3) == 0)
423 etr_port0_online = etr_port1_online = 0;
424 else if (strncmp(p, "port0", 5) == 0)
425 etr_port0_online = 1;
426 else if (strncmp(p, "port1", 5) == 0)
427 etr_port1_online = 1;
428 else if (strncmp(p, "on", 2) == 0)
429 etr_port0_online = etr_port1_online = 1;
432 early_param("etr", early_parse_etr);
435 ETR_EVENT_PORT0_CHANGE,
436 ETR_EVENT_PORT1_CHANGE,
437 ETR_EVENT_PORT_ALERT,
438 ETR_EVENT_SYNC_CHECK,
439 ETR_EVENT_SWITCH_LOCAL,
444 * Valid bit combinations of the eacr register are (x = don't care):
445 * e0 e1 dp p0 p1 ea es sl
446 * 0 0 x 0 0 0 0 0 initial, disabled state
447 * 0 0 x 0 1 1 0 0 port 1 online
448 * 0 0 x 1 0 1 0 0 port 0 online
449 * 0 0 x 1 1 1 0 0 both ports online
450 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
451 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
452 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
453 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
454 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
455 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
456 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
457 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
458 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
459 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
460 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
461 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
462 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
463 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
464 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
465 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
467 static struct etr_eacr etr_eacr;
468 static u64 etr_tolec; /* time of last eacr update */
469 static struct etr_aib etr_port0;
470 static int etr_port0_uptodate;
471 static struct etr_aib etr_port1;
472 static int etr_port1_uptodate;
473 static unsigned long etr_events;
474 static struct timer_list etr_timer;
476 static void etr_timeout(unsigned long dummy);
477 static void etr_work_fn(struct work_struct *work);
478 static DEFINE_MUTEX(etr_work_mutex);
479 static DECLARE_WORK(etr_work, etr_work_fn);
482 * Reset ETR attachment.
484 static void etr_reset(void)
486 etr_eacr = (struct etr_eacr) {
487 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
488 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
490 if (etr_setr(&etr_eacr) == 0) {
491 etr_tolec = get_clock();
492 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
493 if (etr_port0_online && etr_port1_online)
494 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
495 } else if (etr_port0_online || etr_port1_online) {
496 pr_warning("The real or virtual hardware system does "
497 "not provide an ETR interface\n");
498 etr_port0_online = etr_port1_online = 0;
502 static int __init etr_init(void)
506 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
509 /* Check if this machine has the steai instruction. */
510 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
511 etr_steai_available = 1;
512 setup_timer(&etr_timer, etr_timeout, 0UL);
513 if (etr_port0_online) {
514 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
515 queue_work(time_sync_wq, &etr_work);
517 if (etr_port1_online) {
518 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
519 queue_work(time_sync_wq, &etr_work);
524 arch_initcall(etr_init);
527 * Two sorts of ETR machine checks. The architecture reads:
528 * "When a machine-check niterruption occurs and if a switch-to-local or
529 * ETR-sync-check interrupt request is pending but disabled, this pending
530 * disabled interruption request is indicated and is cleared".
531 * Which means that we can get etr_switch_to_local events from the machine
532 * check handler although the interruption condition is disabled. Lovely..
536 * Switch to local machine check. This is called when the last usable
537 * ETR port goes inactive. After switch to local the clock is not in sync.
539 void etr_switch_to_local(void)
543 disable_sync_clock(NULL);
544 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
545 queue_work(time_sync_wq, &etr_work);
549 * ETR sync check machine check. This is called when the ETR OTE and the
550 * local clock OTE are farther apart than the ETR sync check tolerance.
551 * After a ETR sync check the clock is not in sync. The machine check
552 * is broadcasted to all cpus at the same time.
554 void etr_sync_check(void)
558 disable_sync_clock(NULL);
559 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
560 queue_work(time_sync_wq, &etr_work);
564 * ETR timing alert. There are two causes:
565 * 1) port state change, check the usability of the port
566 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
567 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
568 * or ETR-data word 4 (edf4) has changed.
570 static void etr_timing_alert(struct etr_irq_parm *intparm)
573 /* ETR port 0 state change. */
574 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
576 /* ETR port 1 state change. */
577 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
580 * ETR port alert on either port 0, 1 or both.
581 * Both ports are not up-to-date now.
583 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
584 queue_work(time_sync_wq, &etr_work);
587 static void etr_timeout(unsigned long dummy)
589 set_bit(ETR_EVENT_UPDATE, &etr_events);
590 queue_work(time_sync_wq, &etr_work);
594 * Check if the etr mode is pss.
596 static inline int etr_mode_is_pps(struct etr_eacr eacr)
598 return eacr.es && !eacr.sl;
602 * Check if the etr mode is etr.
604 static inline int etr_mode_is_etr(struct etr_eacr eacr)
606 return eacr.es && eacr.sl;
610 * Check if the port can be used for TOD synchronization.
611 * For PPS mode the port has to receive OTEs. For ETR mode
612 * the port has to receive OTEs, the ETR stepping bit has to
613 * be zero and the validity bits for data frame 1, 2, and 3
616 static int etr_port_valid(struct etr_aib *aib, int port)
620 /* Check that this port is receiving OTEs. */
624 psc = port ? aib->esw.psc1 : aib->esw.psc0;
625 if (psc == etr_lpsc_pps_mode)
627 if (psc == etr_lpsc_operational_step)
628 return !aib->esw.y && aib->slsw.v1 &&
629 aib->slsw.v2 && aib->slsw.v3;
634 * Check if two ports are on the same network.
636 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
638 // FIXME: any other fields we have to compare?
639 return aib1->edf1.net_id == aib2->edf1.net_id;
643 * Wrapper for etr_stei that converts physical port states
644 * to logical port states to be consistent with the output
645 * of stetr (see etr_psc vs. etr_lpsc).
647 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
649 BUG_ON(etr_steai(aib, func) != 0);
650 /* Convert port state to logical port state. */
651 if (aib->esw.psc0 == 1)
653 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
655 if (aib->esw.psc1 == 1)
657 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
662 * Check if the aib a2 is still connected to the same attachment as
663 * aib a1, the etv values differ by one and a2 is valid.
665 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
667 int state_a1, state_a2;
669 /* Paranoia check: e0/e1 should better be the same. */
670 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
671 a1->esw.eacr.e1 != a2->esw.eacr.e1)
674 /* Still connected to the same etr ? */
675 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
676 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
677 if (state_a1 == etr_lpsc_operational_step) {
678 if (state_a2 != etr_lpsc_operational_step ||
679 a1->edf1.net_id != a2->edf1.net_id ||
680 a1->edf1.etr_id != a2->edf1.etr_id ||
681 a1->edf1.etr_pn != a2->edf1.etr_pn)
683 } else if (state_a2 != etr_lpsc_pps_mode)
686 /* The ETV value of a2 needs to be ETV of a1 + 1. */
687 if (a1->edf2.etv + 1 != a2->edf2.etv)
690 if (!etr_port_valid(a2, p))
696 struct clock_sync_data {
699 unsigned long long fixup_cc;
701 struct etr_aib *etr_aib;
704 static void clock_sync_cpu(struct clock_sync_data *sync)
706 atomic_dec(&sync->cpus);
709 * This looks like a busy wait loop but it isn't. etr_sync_cpus
710 * is called on all other cpus while the TOD clocks is stopped.
711 * __udelay will stop the cpu on an enabled wait psw until the
712 * TOD is running again.
714 while (sync->in_sync == 0) {
717 * A different cpu changes *in_sync. Therefore use
718 * barrier() to force memory access.
722 if (sync->in_sync != 1)
723 /* Didn't work. Clear per-cpu in sync bit again. */
724 disable_sync_clock(NULL);
726 * This round of TOD syncing is done. Set the clock comparator
727 * to the next tick and let the processor continue.
729 fixup_clock_comparator(sync->fixup_cc);
733 * Sync the TOD clock using the port refered to by aibp. This port
734 * has to be enabled and the other port has to be disabled. The
735 * last eacr update has to be more than 1.6 seconds in the past.
737 static int etr_sync_clock(void *data)
740 unsigned long long clock, old_clock, delay, delta;
741 struct clock_sync_data *etr_sync;
742 struct etr_aib *sync_port, *aib;
748 if (xchg(&first, 1) == 1) {
750 clock_sync_cpu(etr_sync);
754 /* Wait until all other cpus entered the sync function. */
755 while (atomic_read(&etr_sync->cpus) != 0)
758 port = etr_sync->etr_port;
759 aib = etr_sync->etr_aib;
760 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
763 /* Set clock to next OTE. */
764 __ctl_set_bit(14, 21);
765 __ctl_set_bit(0, 29);
766 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
767 old_clock = get_clock();
768 if (set_clock(clock) == 0) {
769 __udelay(1); /* Wait for the clock to start. */
770 __ctl_clear_bit(0, 29);
771 __ctl_clear_bit(14, 21);
773 /* Adjust Linux timing variables. */
774 delay = (unsigned long long)
775 (aib->edf2.etv - sync_port->edf2.etv) << 32;
776 delta = adjust_time(old_clock, clock, delay);
777 etr_sync->fixup_cc = delta;
778 fixup_clock_comparator(delta);
779 /* Verify that the clock is properly set. */
780 if (!etr_aib_follows(sync_port, aib, port)) {
782 disable_sync_clock(NULL);
783 etr_sync->in_sync = -EAGAIN;
786 etr_sync->in_sync = 1;
790 /* Could not set the clock ?!? */
791 __ctl_clear_bit(0, 29);
792 __ctl_clear_bit(14, 21);
793 disable_sync_clock(NULL);
794 etr_sync->in_sync = -EAGAIN;
801 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
803 struct clock_sync_data etr_sync;
804 struct etr_aib *sync_port;
808 /* Check if the current aib is adjacent to the sync port aib. */
809 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
810 follows = etr_aib_follows(sync_port, aib, port);
811 memcpy(sync_port, aib, sizeof(*aib));
814 memset(&etr_sync, 0, sizeof(etr_sync));
815 etr_sync.etr_aib = aib;
816 etr_sync.etr_port = port;
818 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
819 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
825 * Handle the immediate effects of the different events.
826 * The port change event is used for online/offline changes.
828 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
830 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
832 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
833 eacr.es = eacr.sl = 0;
834 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
835 etr_port0_uptodate = etr_port1_uptodate = 0;
837 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
840 * Port change of an enabled port. We have to
841 * assume that this can have caused an stepping
844 etr_tolec = get_clock();
845 eacr.p0 = etr_port0_online;
848 etr_port0_uptodate = 0;
850 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
853 * Port change of an enabled port. We have to
854 * assume that this can have caused an stepping
857 etr_tolec = get_clock();
858 eacr.p1 = etr_port1_online;
861 etr_port1_uptodate = 0;
863 clear_bit(ETR_EVENT_UPDATE, &etr_events);
868 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
869 * one of the ports needs an update.
871 static void etr_set_tolec_timeout(unsigned long long now)
873 unsigned long micros;
875 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
876 (!etr_eacr.p1 || etr_port1_uptodate))
878 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
879 micros = (micros > 1600000) ? 0 : 1600000 - micros;
880 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
884 * Set up a time that expires after 1/2 second.
886 static void etr_set_sync_timeout(void)
888 mod_timer(&etr_timer, jiffies + HZ/2);
892 * Update the aib information for one or both ports.
894 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
895 struct etr_eacr eacr)
897 /* With both ports disabled the aib information is useless. */
898 if (!eacr.e0 && !eacr.e1)
901 /* Update port0 or port1 with aib stored in etr_work_fn. */
902 if (aib->esw.q == 0) {
903 /* Information for port 0 stored. */
904 if (eacr.p0 && !etr_port0_uptodate) {
906 if (etr_port0_online)
907 etr_port0_uptodate = 1;
910 /* Information for port 1 stored. */
911 if (eacr.p1 && !etr_port1_uptodate) {
913 if (etr_port0_online)
914 etr_port1_uptodate = 1;
919 * Do not try to get the alternate port aib if the clock
920 * is not in sync yet.
922 if (!check_sync_clock())
926 * If steai is available we can get the information about
927 * the other port immediately. If only stetr is available the
928 * data-port bit toggle has to be used.
930 if (etr_steai_available) {
931 if (eacr.p0 && !etr_port0_uptodate) {
932 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
933 etr_port0_uptodate = 1;
935 if (eacr.p1 && !etr_port1_uptodate) {
936 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
937 etr_port1_uptodate = 1;
941 * One port was updated above, if the other
942 * port is not uptodate toggle dp bit.
944 if ((eacr.p0 && !etr_port0_uptodate) ||
945 (eacr.p1 && !etr_port1_uptodate))
954 * Write new etr control register if it differs from the current one.
955 * Return 1 if etr_tolec has been updated as well.
957 static void etr_update_eacr(struct etr_eacr eacr)
961 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
962 /* No change, return. */
965 * The disable of an active port of the change of the data port
966 * bit can/will cause a change in the data port.
968 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
969 (etr_eacr.dp ^ eacr.dp) != 0;
973 etr_tolec = get_clock();
977 * ETR work. In this function you'll find the main logic. In
978 * particular this is the only function that calls etr_update_eacr(),
979 * it "controls" the etr control register.
981 static void etr_work_fn(struct work_struct *work)
983 unsigned long long now;
984 struct etr_eacr eacr;
988 /* prevent multiple execution. */
989 mutex_lock(&etr_work_mutex);
991 /* Create working copy of etr_eacr. */
994 /* Check for the different events and their immediate effects. */
995 eacr = etr_handle_events(eacr);
997 /* Check if ETR is supposed to be active. */
998 eacr.ea = eacr.p0 || eacr.p1;
1000 /* Both ports offline. Reset everything. */
1001 eacr.dp = eacr.es = eacr.sl = 0;
1002 on_each_cpu(disable_sync_clock, NULL, 1);
1003 del_timer_sync(&etr_timer);
1004 etr_update_eacr(eacr);
1008 /* Store aib to get the current ETR status word. */
1009 BUG_ON(etr_stetr(&aib) != 0);
1010 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
1014 * Update the port information if the last stepping port change
1015 * or data port change is older than 1.6 seconds.
1017 if (now >= etr_tolec + (1600000 << 12))
1018 eacr = etr_handle_update(&aib, eacr);
1021 * Select ports to enable. The prefered synchronization mode is PPS.
1022 * If a port can be enabled depends on a number of things:
1023 * 1) The port needs to be online and uptodate. A port is not
1024 * disabled just because it is not uptodate, but it is only
1025 * enabled if it is uptodate.
1026 * 2) The port needs to have the same mode (pps / etr).
1027 * 3) The port needs to be usable -> etr_port_valid() == 1
1028 * 4) To enable the second port the clock needs to be in sync.
1029 * 5) If both ports are useable and are ETR ports, the network id
1030 * has to be the same.
1031 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1033 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1036 if (!etr_mode_is_pps(etr_eacr))
1038 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1040 // FIXME: uptodate checks ?
1041 else if (etr_port0_uptodate && etr_port1_uptodate)
1043 sync_port = (etr_port0_uptodate &&
1044 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1045 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1049 if (!etr_mode_is_pps(etr_eacr))
1051 sync_port = (etr_port1_uptodate &&
1052 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1053 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1056 if (!etr_mode_is_etr(etr_eacr))
1058 if (!eacr.es || !eacr.p1 ||
1059 aib.esw.psc1 != etr_lpsc_operational_alt)
1061 else if (etr_port0_uptodate && etr_port1_uptodate &&
1062 etr_compare_network(&etr_port0, &etr_port1))
1064 sync_port = (etr_port0_uptodate &&
1065 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1066 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1070 if (!etr_mode_is_etr(etr_eacr))
1072 sync_port = (etr_port1_uptodate &&
1073 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1075 /* Both ports not usable. */
1076 eacr.es = eacr.sl = 0;
1081 * If the clock is in sync just update the eacr and return.
1082 * If there is no valid sync port wait for a port update.
1084 if (check_sync_clock() || sync_port < 0) {
1085 etr_update_eacr(eacr);
1086 etr_set_tolec_timeout(now);
1091 * Prepare control register for clock syncing
1092 * (reset data port bit, set sync check control.
1098 * Update eacr and try to synchronize the clock. If the update
1099 * of eacr caused a stepping port switch (or if we have to
1100 * assume that a stepping port switch has occured) or the
1101 * clock syncing failed, reset the sync check control bit
1102 * and set up a timer to try again after 0.5 seconds
1104 etr_update_eacr(eacr);
1105 if (now < etr_tolec + (1600000 << 12) ||
1106 etr_sync_clock_stop(&aib, sync_port) != 0) {
1107 /* Sync failed. Try again in 1/2 second. */
1109 etr_update_eacr(eacr);
1110 etr_set_sync_timeout();
1112 etr_set_tolec_timeout(now);
1114 mutex_unlock(&etr_work_mutex);
1118 * Sysfs interface functions
1120 static struct sysdev_class etr_sysclass = {
1124 static struct sys_device etr_port0_dev = {
1126 .cls = &etr_sysclass,
1129 static struct sys_device etr_port1_dev = {
1131 .cls = &etr_sysclass,
1135 * ETR class attributes
1137 static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf)
1139 return sprintf(buf, "%i\n", etr_port0.esw.p);
1142 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1144 static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf)
1148 if (etr_mode_is_pps(etr_eacr))
1150 else if (etr_mode_is_etr(etr_eacr))
1154 return sprintf(buf, "%s\n", mode_str);
1157 static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1160 * ETR port attributes
1162 static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1164 if (dev == &etr_port0_dev)
1165 return etr_port0_online ? &etr_port0 : NULL;
1167 return etr_port1_online ? &etr_port1 : NULL;
1170 static ssize_t etr_online_show(struct sys_device *dev,
1171 struct sysdev_attribute *attr,
1174 unsigned int online;
1176 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1177 return sprintf(buf, "%i\n", online);
1180 static ssize_t etr_online_store(struct sys_device *dev,
1181 struct sysdev_attribute *attr,
1182 const char *buf, size_t count)
1186 value = simple_strtoul(buf, NULL, 0);
1187 if (value != 0 && value != 1)
1189 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1191 mutex_lock(&clock_sync_mutex);
1192 if (dev == &etr_port0_dev) {
1193 if (etr_port0_online == value)
1194 goto out; /* Nothing to do. */
1195 etr_port0_online = value;
1196 if (etr_port0_online && etr_port1_online)
1197 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1199 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1200 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1201 queue_work(time_sync_wq, &etr_work);
1203 if (etr_port1_online == value)
1204 goto out; /* Nothing to do. */
1205 etr_port1_online = value;
1206 if (etr_port0_online && etr_port1_online)
1207 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1209 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1210 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1211 queue_work(time_sync_wq, &etr_work);
1214 mutex_unlock(&clock_sync_mutex);
1218 static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1220 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1221 struct sysdev_attribute *attr,
1224 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1225 etr_eacr.e0 : etr_eacr.e1);
1228 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1230 static ssize_t etr_mode_code_show(struct sys_device *dev,
1231 struct sysdev_attribute *attr, char *buf)
1233 if (!etr_port0_online && !etr_port1_online)
1234 /* Status word is not uptodate if both ports are offline. */
1236 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1237 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1240 static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1242 static ssize_t etr_untuned_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.u);
1252 static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1254 static ssize_t etr_network_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.net_id);
1264 static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1266 static ssize_t etr_id_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_id);
1276 static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1278 static ssize_t etr_port_number_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.v1)
1285 return sprintf(buf, "%i\n", aib->edf1.etr_pn);
1288 static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1290 static ssize_t etr_coupled_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.c);
1300 static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1302 static ssize_t etr_local_time_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.blto);
1312 static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1314 static ssize_t etr_utc_offset_show(struct sys_device *dev,
1315 struct sysdev_attribute *attr, char *buf)
1317 struct etr_aib *aib = etr_aib_from_dev(dev);
1319 if (!aib || !aib->slsw.v3)
1321 return sprintf(buf, "%i\n", aib->edf3.buo);
1324 static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1326 static struct sysdev_attribute *etr_port_attributes[] = {
1328 &attr_stepping_control,
1340 static int __init etr_register_port(struct sys_device *dev)
1342 struct sysdev_attribute **attr;
1345 rc = sysdev_register(dev);
1348 for (attr = etr_port_attributes; *attr; attr++) {
1349 rc = sysdev_create_file(dev, *attr);
1355 for (; attr >= etr_port_attributes; attr--)
1356 sysdev_remove_file(dev, *attr);
1357 sysdev_unregister(dev);
1362 static void __init etr_unregister_port(struct sys_device *dev)
1364 struct sysdev_attribute **attr;
1366 for (attr = etr_port_attributes; *attr; attr++)
1367 sysdev_remove_file(dev, *attr);
1368 sysdev_unregister(dev);
1371 static int __init etr_init_sysfs(void)
1375 rc = sysdev_class_register(&etr_sysclass);
1378 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1380 goto out_unreg_class;
1381 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1383 goto out_remove_stepping_port;
1384 rc = etr_register_port(&etr_port0_dev);
1386 goto out_remove_stepping_mode;
1387 rc = etr_register_port(&etr_port1_dev);
1389 goto out_remove_port0;
1393 etr_unregister_port(&etr_port0_dev);
1394 out_remove_stepping_mode:
1395 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1396 out_remove_stepping_port:
1397 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1399 sysdev_class_unregister(&etr_sysclass);
1404 device_initcall(etr_init_sysfs);
1407 * Server Time Protocol (STP) code.
1409 static int stp_online;
1410 static struct stp_sstpi stp_info;
1411 static void *stp_page;
1413 static void stp_work_fn(struct work_struct *work);
1414 static DEFINE_MUTEX(stp_work_mutex);
1415 static DECLARE_WORK(stp_work, stp_work_fn);
1416 static struct timer_list stp_timer;
1418 static int __init early_parse_stp(char *p)
1420 if (strncmp(p, "off", 3) == 0)
1422 else if (strncmp(p, "on", 2) == 0)
1426 early_param("stp", early_parse_stp);
1429 * Reset STP attachment.
1431 static void __init stp_reset(void)
1435 stp_page = alloc_bootmem_pages(PAGE_SIZE);
1436 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1438 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1439 else if (stp_online) {
1440 pr_warning("The real or virtual hardware system does "
1441 "not provide an STP interface\n");
1442 free_bootmem((unsigned long) stp_page, PAGE_SIZE);
1448 static void stp_timeout(unsigned long dummy)
1450 queue_work(time_sync_wq, &stp_work);
1453 static int __init stp_init(void)
1455 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1457 setup_timer(&stp_timer, stp_timeout, 0UL);
1461 queue_work(time_sync_wq, &stp_work);
1465 arch_initcall(stp_init);
1468 * STP timing alert. There are three causes:
1469 * 1) timing status change
1470 * 2) link availability change
1471 * 3) time control parameter change
1472 * In all three cases we are only interested in the clock source state.
1473 * If a STP clock source is now available use it.
1475 static void stp_timing_alert(struct stp_irq_parm *intparm)
1477 if (intparm->tsc || intparm->lac || intparm->tcpc)
1478 queue_work(time_sync_wq, &stp_work);
1482 * STP sync check machine check. This is called when the timing state
1483 * changes from the synchronized state to the unsynchronized state.
1484 * After a STP sync check the clock is not in sync. The machine check
1485 * is broadcasted to all cpus at the same time.
1487 void stp_sync_check(void)
1489 disable_sync_clock(NULL);
1490 queue_work(time_sync_wq, &stp_work);
1494 * STP island condition machine check. This is called when an attached
1495 * server attempts to communicate over an STP link and the servers
1496 * have matching CTN ids and have a valid stratum-1 configuration
1497 * but the configurations do not match.
1499 void stp_island_check(void)
1501 disable_sync_clock(NULL);
1502 queue_work(time_sync_wq, &stp_work);
1506 static int stp_sync_clock(void *data)
1509 unsigned long long old_clock, delta;
1510 struct clock_sync_data *stp_sync;
1515 if (xchg(&first, 1) == 1) {
1517 clock_sync_cpu(stp_sync);
1521 /* Wait until all other cpus entered the sync function. */
1522 while (atomic_read(&stp_sync->cpus) != 0)
1525 enable_sync_clock();
1528 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1529 stp_info.todoff[2] || stp_info.todoff[3] ||
1530 stp_info.tmd != 2) {
1531 old_clock = get_clock();
1532 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1534 delta = adjust_time(old_clock, get_clock(), 0);
1535 fixup_clock_comparator(delta);
1536 rc = chsc_sstpi(stp_page, &stp_info,
1537 sizeof(struct stp_sstpi));
1538 if (rc == 0 && stp_info.tmd != 2)
1543 disable_sync_clock(NULL);
1544 stp_sync->in_sync = -EAGAIN;
1546 stp_sync->in_sync = 1;
1552 * STP work. Check for the STP state and take over the clock
1553 * synchronization if the STP clock source is usable.
1555 static void stp_work_fn(struct work_struct *work)
1557 struct clock_sync_data stp_sync;
1560 /* prevent multiple execution. */
1561 mutex_lock(&stp_work_mutex);
1564 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1565 del_timer_sync(&stp_timer);
1569 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1573 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1574 if (rc || stp_info.c == 0)
1577 /* Skip synchronization if the clock is already in sync. */
1578 if (check_sync_clock())
1581 memset(&stp_sync, 0, sizeof(stp_sync));
1583 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1584 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1587 if (!check_sync_clock())
1589 * There is a usable clock but the synchonization failed.
1590 * Retry after a second.
1592 mod_timer(&stp_timer, jiffies + HZ);
1595 mutex_unlock(&stp_work_mutex);
1599 * STP class sysfs interface functions
1601 static struct sysdev_class stp_sysclass = {
1605 static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf)
1609 return sprintf(buf, "%016llx\n",
1610 *(unsigned long long *) stp_info.ctnid);
1613 static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1615 static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf)
1619 return sprintf(buf, "%i\n", stp_info.ctn);
1622 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1624 static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf)
1626 if (!stp_online || !(stp_info.vbits & 0x2000))
1628 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1631 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1633 static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf)
1635 if (!stp_online || !(stp_info.vbits & 0x8000))
1637 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1640 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1642 static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf)
1646 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1649 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1651 static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf)
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, char *buf)
1662 if (!stp_online || !(stp_info.vbits & 0x4000))
1664 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1667 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1668 stp_time_zone_offset_show, NULL);
1670 static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf)
1674 return sprintf(buf, "%i\n", stp_info.tmd);
1677 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1679 static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf)
1683 return sprintf(buf, "%i\n", stp_info.tst);
1686 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1688 static ssize_t stp_online_show(struct sysdev_class *class, char *buf)
1690 return sprintf(buf, "%i\n", stp_online);
1693 static ssize_t stp_online_store(struct sysdev_class *class,
1694 const char *buf, size_t count)
1698 value = simple_strtoul(buf, NULL, 0);
1699 if (value != 0 && value != 1)
1701 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1703 mutex_lock(&clock_sync_mutex);
1706 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1708 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1709 queue_work(time_sync_wq, &stp_work);
1710 mutex_unlock(&clock_sync_mutex);
1715 * Can't use SYSDEV_CLASS_ATTR because the attribute should be named
1716 * stp/online but attr_online already exists in this file ..
1718 static struct sysdev_class_attribute attr_stp_online = {
1719 .attr = { .name = "online", .mode = 0600 },
1720 .show = stp_online_show,
1721 .store = stp_online_store,
1724 static struct sysdev_class_attribute *stp_attributes[] = {
1732 &attr_time_zone_offset,
1738 static int __init stp_init_sysfs(void)
1740 struct sysdev_class_attribute **attr;
1743 rc = sysdev_class_register(&stp_sysclass);
1746 for (attr = stp_attributes; *attr; attr++) {
1747 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1753 for (; attr >= stp_attributes; attr--)
1754 sysdev_class_remove_file(&stp_sysclass, *attr);
1755 sysdev_class_unregister(&stp_sysclass);
1760 device_initcall(stp_init_sysfs);