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)
54 u64 sched_clock_base_cc = -1; /* Force to data section. */
55 EXPORT_SYMBOL_GPL(sched_clock_base_cc);
57 static DEFINE_PER_CPU(struct clock_event_device, comparators);
60 * Scheduler clock - returns current time in nanosec units.
62 unsigned long long notrace sched_clock(void)
64 return (get_clock_monotonic() * 125) >> 9;
68 * Monotonic_clock - returns # of nanoseconds passed since time_init()
70 unsigned long long monotonic_clock(void)
74 EXPORT_SYMBOL(monotonic_clock);
76 void tod_to_timeval(__u64 todval, struct timespec *xtime)
78 unsigned long long sec;
83 todval -= (sec * 1000000) << 12;
84 xtime->tv_nsec = ((todval * 1000) >> 12);
86 EXPORT_SYMBOL(tod_to_timeval);
88 void clock_comparator_work(void)
90 struct clock_event_device *cd;
92 S390_lowcore.clock_comparator = -1ULL;
93 set_clock_comparator(S390_lowcore.clock_comparator);
94 cd = &__get_cpu_var(comparators);
95 cd->event_handler(cd);
99 * Fixup the clock comparator.
101 static void fixup_clock_comparator(unsigned long long delta)
103 /* If nobody is waiting there's nothing to fix. */
104 if (S390_lowcore.clock_comparator == -1ULL)
106 S390_lowcore.clock_comparator += delta;
107 set_clock_comparator(S390_lowcore.clock_comparator);
110 static int s390_next_event(unsigned long delta,
111 struct clock_event_device *evt)
113 S390_lowcore.clock_comparator = get_clock() + delta;
114 set_clock_comparator(S390_lowcore.clock_comparator);
118 static void s390_set_mode(enum clock_event_mode mode,
119 struct clock_event_device *evt)
124 * Set up lowcore and control register of the current cpu to
125 * enable TOD clock and clock comparator interrupts.
127 void init_cpu_timer(void)
129 struct clock_event_device *cd;
132 S390_lowcore.clock_comparator = -1ULL;
133 set_clock_comparator(S390_lowcore.clock_comparator);
135 cpu = smp_processor_id();
136 cd = &per_cpu(comparators, cpu);
137 cd->name = "comparator";
138 cd->features = CLOCK_EVT_FEAT_ONESHOT;
141 cd->min_delta_ns = 1;
142 cd->max_delta_ns = LONG_MAX;
144 cd->cpumask = cpumask_of(cpu);
145 cd->set_next_event = s390_next_event;
146 cd->set_mode = s390_set_mode;
148 clockevents_register_device(cd);
150 /* Enable clock comparator timer interrupt. */
153 /* Always allow the timing alert external interrupt. */
157 static void clock_comparator_interrupt(__u16 code)
159 if (S390_lowcore.clock_comparator == -1ULL)
160 set_clock_comparator(S390_lowcore.clock_comparator);
163 static void etr_timing_alert(struct etr_irq_parm *);
164 static void stp_timing_alert(struct stp_irq_parm *);
166 static void timing_alert_interrupt(__u16 code)
168 if (S390_lowcore.ext_params & 0x00c40000)
169 etr_timing_alert((struct etr_irq_parm *)
170 &S390_lowcore.ext_params);
171 if (S390_lowcore.ext_params & 0x00038000)
172 stp_timing_alert((struct stp_irq_parm *)
173 &S390_lowcore.ext_params);
176 static void etr_reset(void);
177 static void stp_reset(void);
179 void read_persistent_clock(struct timespec *ts)
181 tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts);
184 void read_boot_clock(struct timespec *ts)
186 tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts);
189 static cycle_t read_tod_clock(struct clocksource *cs)
194 static struct clocksource clocksource_tod = {
197 .read = read_tod_clock,
201 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
204 struct clocksource * __init clocksource_default_clock(void)
206 return &clocksource_tod;
209 void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
212 if (clock != &clocksource_tod)
215 /* Make userspace gettimeofday spin until we're done. */
216 ++vdso_data->tb_update_count;
218 vdso_data->xtime_tod_stamp = clock->cycle_last;
219 vdso_data->xtime_clock_sec = xtime.tv_sec;
220 vdso_data->xtime_clock_nsec = xtime.tv_nsec;
221 vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
222 vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
224 ++vdso_data->tb_update_count;
227 extern struct timezone sys_tz;
229 void update_vsyscall_tz(void)
231 /* Make userspace gettimeofday spin until we're done. */
232 ++vdso_data->tb_update_count;
234 vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
235 vdso_data->tz_dsttime = sys_tz.tz_dsttime;
237 ++vdso_data->tb_update_count;
241 * Initialize the TOD clock and the CPU timer of
244 void __init time_init(void)
246 /* Reset time synchronization interfaces. */
250 /* request the clock comparator external interrupt */
251 if (register_external_interrupt(0x1004, clock_comparator_interrupt))
252 panic("Couldn't request external interrupt 0x1004");
254 /* request the timing alert external interrupt */
255 if (register_external_interrupt(0x1406, timing_alert_interrupt))
256 panic("Couldn't request external interrupt 0x1406");
258 if (clocksource_register(&clocksource_tod) != 0)
259 panic("Could not register TOD clock source");
261 /* Enable TOD clock interrupts on the boot cpu. */
264 /* Enable cpu timer interrupts on the boot cpu. */
269 * The time is "clock". old is what we think the time is.
270 * Adjust the value by a multiple of jiffies and add the delta to ntp.
271 * "delay" is an approximation how long the synchronization took. If
272 * the time correction is positive, then "delay" is subtracted from
273 * the time difference and only the remaining part is passed to ntp.
275 static unsigned long long adjust_time(unsigned long long old,
276 unsigned long long clock,
277 unsigned long long delay)
279 unsigned long long delta, ticks;
283 /* It is later than we thought. */
284 delta = ticks = clock - old;
285 delta = ticks = (delta < delay) ? 0 : delta - delay;
286 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
287 adjust.offset = ticks * (1000000 / HZ);
289 /* It is earlier than we thought. */
290 delta = ticks = old - clock;
291 delta -= do_div(ticks, CLK_TICKS_PER_JIFFY);
293 adjust.offset = -ticks * (1000000 / HZ);
295 sched_clock_base_cc += delta;
296 if (adjust.offset != 0) {
297 pr_notice("The ETR interface has adjusted the clock "
298 "by %li microseconds\n", adjust.offset);
299 adjust.modes = ADJ_OFFSET_SINGLESHOT;
300 do_adjtimex(&adjust);
305 static DEFINE_PER_CPU(atomic_t, clock_sync_word);
306 static DEFINE_MUTEX(clock_sync_mutex);
307 static unsigned long clock_sync_flags;
309 #define CLOCK_SYNC_HAS_ETR 0
310 #define CLOCK_SYNC_HAS_STP 1
311 #define CLOCK_SYNC_ETR 2
312 #define CLOCK_SYNC_STP 3
315 * The synchronous get_clock function. It will write the current clock
316 * value to the clock pointer and return 0 if the clock is in sync with
317 * the external time source. If the clock mode is local it will return
318 * -ENOSYS and -EAGAIN if the clock is not in sync with the external
321 int get_sync_clock(unsigned long long *clock)
324 unsigned int sw0, sw1;
326 sw_ptr = &get_cpu_var(clock_sync_word);
327 sw0 = atomic_read(sw_ptr);
328 *clock = get_clock();
329 sw1 = atomic_read(sw_ptr);
330 put_cpu_var(clock_sync_word);
331 if (sw0 == sw1 && (sw0 & 0x80000000U))
332 /* Success: time is in sync. */
334 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) &&
335 !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
337 if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) &&
338 !test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
342 EXPORT_SYMBOL(get_sync_clock);
345 * Make get_sync_clock return -EAGAIN.
347 static void disable_sync_clock(void *dummy)
349 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
351 * Clear the in-sync bit 2^31. All get_sync_clock calls will
352 * fail until the sync bit is turned back on. In addition
353 * increase the "sequence" counter to avoid the race of an
354 * etr event and the complete recovery against get_sync_clock.
356 atomic_clear_mask(0x80000000, sw_ptr);
361 * Make get_sync_clock return 0 again.
362 * Needs to be called from a context disabled for preemption.
364 static void enable_sync_clock(void)
366 atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word);
367 atomic_set_mask(0x80000000, sw_ptr);
371 * Function to check if the clock is in sync.
373 static inline int check_sync_clock(void)
378 sw_ptr = &get_cpu_var(clock_sync_word);
379 rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
380 put_cpu_var(clock_sync_word);
384 /* Single threaded workqueue used for etr and stp sync events */
385 static struct workqueue_struct *time_sync_wq;
387 static void __init time_init_wq(void)
391 time_sync_wq = create_singlethread_workqueue("timesync");
392 stop_machine_create();
396 * External Time Reference (ETR) code.
398 static int etr_port0_online;
399 static int etr_port1_online;
400 static int etr_steai_available;
402 static int __init early_parse_etr(char *p)
404 if (strncmp(p, "off", 3) == 0)
405 etr_port0_online = etr_port1_online = 0;
406 else if (strncmp(p, "port0", 5) == 0)
407 etr_port0_online = 1;
408 else if (strncmp(p, "port1", 5) == 0)
409 etr_port1_online = 1;
410 else if (strncmp(p, "on", 2) == 0)
411 etr_port0_online = etr_port1_online = 1;
414 early_param("etr", early_parse_etr);
417 ETR_EVENT_PORT0_CHANGE,
418 ETR_EVENT_PORT1_CHANGE,
419 ETR_EVENT_PORT_ALERT,
420 ETR_EVENT_SYNC_CHECK,
421 ETR_EVENT_SWITCH_LOCAL,
426 * Valid bit combinations of the eacr register are (x = don't care):
427 * e0 e1 dp p0 p1 ea es sl
428 * 0 0 x 0 0 0 0 0 initial, disabled state
429 * 0 0 x 0 1 1 0 0 port 1 online
430 * 0 0 x 1 0 1 0 0 port 0 online
431 * 0 0 x 1 1 1 0 0 both ports online
432 * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
433 * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
434 * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
435 * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
436 * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
437 * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
438 * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
439 * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
440 * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
441 * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
442 * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
443 * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
444 * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
445 * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
446 * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
447 * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
449 static struct etr_eacr etr_eacr;
450 static u64 etr_tolec; /* time of last eacr update */
451 static struct etr_aib etr_port0;
452 static int etr_port0_uptodate;
453 static struct etr_aib etr_port1;
454 static int etr_port1_uptodate;
455 static unsigned long etr_events;
456 static struct timer_list etr_timer;
458 static void etr_timeout(unsigned long dummy);
459 static void etr_work_fn(struct work_struct *work);
460 static DEFINE_MUTEX(etr_work_mutex);
461 static DECLARE_WORK(etr_work, etr_work_fn);
464 * Reset ETR attachment.
466 static void etr_reset(void)
468 etr_eacr = (struct etr_eacr) {
469 .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
470 .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
472 if (etr_setr(&etr_eacr) == 0) {
473 etr_tolec = get_clock();
474 set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
475 if (etr_port0_online && etr_port1_online)
476 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
477 } else if (etr_port0_online || etr_port1_online) {
478 pr_warning("The real or virtual hardware system does "
479 "not provide an ETR interface\n");
480 etr_port0_online = etr_port1_online = 0;
484 static int __init etr_init(void)
488 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
491 /* Check if this machine has the steai instruction. */
492 if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
493 etr_steai_available = 1;
494 setup_timer(&etr_timer, etr_timeout, 0UL);
495 if (etr_port0_online) {
496 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
497 queue_work(time_sync_wq, &etr_work);
499 if (etr_port1_online) {
500 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
501 queue_work(time_sync_wq, &etr_work);
506 arch_initcall(etr_init);
509 * Two sorts of ETR machine checks. The architecture reads:
510 * "When a machine-check niterruption occurs and if a switch-to-local or
511 * ETR-sync-check interrupt request is pending but disabled, this pending
512 * disabled interruption request is indicated and is cleared".
513 * Which means that we can get etr_switch_to_local events from the machine
514 * check handler although the interruption condition is disabled. Lovely..
518 * Switch to local machine check. This is called when the last usable
519 * ETR port goes inactive. After switch to local the clock is not in sync.
521 void etr_switch_to_local(void)
525 disable_sync_clock(NULL);
526 set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
527 queue_work(time_sync_wq, &etr_work);
531 * ETR sync check machine check. This is called when the ETR OTE and the
532 * local clock OTE are farther apart than the ETR sync check tolerance.
533 * After a ETR sync check the clock is not in sync. The machine check
534 * is broadcasted to all cpus at the same time.
536 void etr_sync_check(void)
540 disable_sync_clock(NULL);
541 set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
542 queue_work(time_sync_wq, &etr_work);
546 * ETR timing alert. There are two causes:
547 * 1) port state change, check the usability of the port
548 * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
549 * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
550 * or ETR-data word 4 (edf4) has changed.
552 static void etr_timing_alert(struct etr_irq_parm *intparm)
555 /* ETR port 0 state change. */
556 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
558 /* ETR port 1 state change. */
559 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
562 * ETR port alert on either port 0, 1 or both.
563 * Both ports are not up-to-date now.
565 set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
566 queue_work(time_sync_wq, &etr_work);
569 static void etr_timeout(unsigned long dummy)
571 set_bit(ETR_EVENT_UPDATE, &etr_events);
572 queue_work(time_sync_wq, &etr_work);
576 * Check if the etr mode is pss.
578 static inline int etr_mode_is_pps(struct etr_eacr eacr)
580 return eacr.es && !eacr.sl;
584 * Check if the etr mode is etr.
586 static inline int etr_mode_is_etr(struct etr_eacr eacr)
588 return eacr.es && eacr.sl;
592 * Check if the port can be used for TOD synchronization.
593 * For PPS mode the port has to receive OTEs. For ETR mode
594 * the port has to receive OTEs, the ETR stepping bit has to
595 * be zero and the validity bits for data frame 1, 2, and 3
598 static int etr_port_valid(struct etr_aib *aib, int port)
602 /* Check that this port is receiving OTEs. */
606 psc = port ? aib->esw.psc1 : aib->esw.psc0;
607 if (psc == etr_lpsc_pps_mode)
609 if (psc == etr_lpsc_operational_step)
610 return !aib->esw.y && aib->slsw.v1 &&
611 aib->slsw.v2 && aib->slsw.v3;
616 * Check if two ports are on the same network.
618 static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
620 // FIXME: any other fields we have to compare?
621 return aib1->edf1.net_id == aib2->edf1.net_id;
625 * Wrapper for etr_stei that converts physical port states
626 * to logical port states to be consistent with the output
627 * of stetr (see etr_psc vs. etr_lpsc).
629 static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
631 BUG_ON(etr_steai(aib, func) != 0);
632 /* Convert port state to logical port state. */
633 if (aib->esw.psc0 == 1)
635 else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
637 if (aib->esw.psc1 == 1)
639 else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
644 * Check if the aib a2 is still connected to the same attachment as
645 * aib a1, the etv values differ by one and a2 is valid.
647 static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
649 int state_a1, state_a2;
651 /* Paranoia check: e0/e1 should better be the same. */
652 if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
653 a1->esw.eacr.e1 != a2->esw.eacr.e1)
656 /* Still connected to the same etr ? */
657 state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
658 state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
659 if (state_a1 == etr_lpsc_operational_step) {
660 if (state_a2 != etr_lpsc_operational_step ||
661 a1->edf1.net_id != a2->edf1.net_id ||
662 a1->edf1.etr_id != a2->edf1.etr_id ||
663 a1->edf1.etr_pn != a2->edf1.etr_pn)
665 } else if (state_a2 != etr_lpsc_pps_mode)
668 /* The ETV value of a2 needs to be ETV of a1 + 1. */
669 if (a1->edf2.etv + 1 != a2->edf2.etv)
672 if (!etr_port_valid(a2, p))
678 struct clock_sync_data {
681 unsigned long long fixup_cc;
683 struct etr_aib *etr_aib;
686 static void clock_sync_cpu(struct clock_sync_data *sync)
688 atomic_dec(&sync->cpus);
691 * This looks like a busy wait loop but it isn't. etr_sync_cpus
692 * is called on all other cpus while the TOD clocks is stopped.
693 * __udelay will stop the cpu on an enabled wait psw until the
694 * TOD is running again.
696 while (sync->in_sync == 0) {
699 * A different cpu changes *in_sync. Therefore use
700 * barrier() to force memory access.
704 if (sync->in_sync != 1)
705 /* Didn't work. Clear per-cpu in sync bit again. */
706 disable_sync_clock(NULL);
708 * This round of TOD syncing is done. Set the clock comparator
709 * to the next tick and let the processor continue.
711 fixup_clock_comparator(sync->fixup_cc);
715 * Sync the TOD clock using the port refered to by aibp. This port
716 * has to be enabled and the other port has to be disabled. The
717 * last eacr update has to be more than 1.6 seconds in the past.
719 static int etr_sync_clock(void *data)
722 unsigned long long clock, old_clock, delay, delta;
723 struct clock_sync_data *etr_sync;
724 struct etr_aib *sync_port, *aib;
730 if (xchg(&first, 1) == 1) {
732 clock_sync_cpu(etr_sync);
736 /* Wait until all other cpus entered the sync function. */
737 while (atomic_read(&etr_sync->cpus) != 0)
740 port = etr_sync->etr_port;
741 aib = etr_sync->etr_aib;
742 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
745 /* Set clock to next OTE. */
746 __ctl_set_bit(14, 21);
747 __ctl_set_bit(0, 29);
748 clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
749 old_clock = get_clock();
750 if (set_clock(clock) == 0) {
751 __udelay(1); /* Wait for the clock to start. */
752 __ctl_clear_bit(0, 29);
753 __ctl_clear_bit(14, 21);
755 /* Adjust Linux timing variables. */
756 delay = (unsigned long long)
757 (aib->edf2.etv - sync_port->edf2.etv) << 32;
758 delta = adjust_time(old_clock, clock, delay);
759 etr_sync->fixup_cc = delta;
760 fixup_clock_comparator(delta);
761 /* Verify that the clock is properly set. */
762 if (!etr_aib_follows(sync_port, aib, port)) {
764 disable_sync_clock(NULL);
765 etr_sync->in_sync = -EAGAIN;
768 etr_sync->in_sync = 1;
772 /* Could not set the clock ?!? */
773 __ctl_clear_bit(0, 29);
774 __ctl_clear_bit(14, 21);
775 disable_sync_clock(NULL);
776 etr_sync->in_sync = -EAGAIN;
783 static int etr_sync_clock_stop(struct etr_aib *aib, int port)
785 struct clock_sync_data etr_sync;
786 struct etr_aib *sync_port;
790 /* Check if the current aib is adjacent to the sync port aib. */
791 sync_port = (port == 0) ? &etr_port0 : &etr_port1;
792 follows = etr_aib_follows(sync_port, aib, port);
793 memcpy(sync_port, aib, sizeof(*aib));
796 memset(&etr_sync, 0, sizeof(etr_sync));
797 etr_sync.etr_aib = aib;
798 etr_sync.etr_port = port;
800 atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
801 rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map);
807 * Handle the immediate effects of the different events.
808 * The port change event is used for online/offline changes.
810 static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
812 if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
814 if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
815 eacr.es = eacr.sl = 0;
816 if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
817 etr_port0_uptodate = etr_port1_uptodate = 0;
819 if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
822 * Port change of an enabled port. We have to
823 * assume that this can have caused an stepping
826 etr_tolec = get_clock();
827 eacr.p0 = etr_port0_online;
830 etr_port0_uptodate = 0;
832 if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
835 * Port change of an enabled port. We have to
836 * assume that this can have caused an stepping
839 etr_tolec = get_clock();
840 eacr.p1 = etr_port1_online;
843 etr_port1_uptodate = 0;
845 clear_bit(ETR_EVENT_UPDATE, &etr_events);
850 * Set up a timer that expires after the etr_tolec + 1.6 seconds if
851 * one of the ports needs an update.
853 static void etr_set_tolec_timeout(unsigned long long now)
855 unsigned long micros;
857 if ((!etr_eacr.p0 || etr_port0_uptodate) &&
858 (!etr_eacr.p1 || etr_port1_uptodate))
860 micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
861 micros = (micros > 1600000) ? 0 : 1600000 - micros;
862 mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
866 * Set up a time that expires after 1/2 second.
868 static void etr_set_sync_timeout(void)
870 mod_timer(&etr_timer, jiffies + HZ/2);
874 * Update the aib information for one or both ports.
876 static struct etr_eacr etr_handle_update(struct etr_aib *aib,
877 struct etr_eacr eacr)
879 /* With both ports disabled the aib information is useless. */
880 if (!eacr.e0 && !eacr.e1)
883 /* Update port0 or port1 with aib stored in etr_work_fn. */
884 if (aib->esw.q == 0) {
885 /* Information for port 0 stored. */
886 if (eacr.p0 && !etr_port0_uptodate) {
888 if (etr_port0_online)
889 etr_port0_uptodate = 1;
892 /* Information for port 1 stored. */
893 if (eacr.p1 && !etr_port1_uptodate) {
895 if (etr_port0_online)
896 etr_port1_uptodate = 1;
901 * Do not try to get the alternate port aib if the clock
902 * is not in sync yet.
904 if (!check_sync_clock())
908 * If steai is available we can get the information about
909 * the other port immediately. If only stetr is available the
910 * data-port bit toggle has to be used.
912 if (etr_steai_available) {
913 if (eacr.p0 && !etr_port0_uptodate) {
914 etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
915 etr_port0_uptodate = 1;
917 if (eacr.p1 && !etr_port1_uptodate) {
918 etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
919 etr_port1_uptodate = 1;
923 * One port was updated above, if the other
924 * port is not uptodate toggle dp bit.
926 if ((eacr.p0 && !etr_port0_uptodate) ||
927 (eacr.p1 && !etr_port1_uptodate))
936 * Write new etr control register if it differs from the current one.
937 * Return 1 if etr_tolec has been updated as well.
939 static void etr_update_eacr(struct etr_eacr eacr)
943 if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
944 /* No change, return. */
947 * The disable of an active port of the change of the data port
948 * bit can/will cause a change in the data port.
950 dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
951 (etr_eacr.dp ^ eacr.dp) != 0;
955 etr_tolec = get_clock();
959 * ETR work. In this function you'll find the main logic. In
960 * particular this is the only function that calls etr_update_eacr(),
961 * it "controls" the etr control register.
963 static void etr_work_fn(struct work_struct *work)
965 unsigned long long now;
966 struct etr_eacr eacr;
970 /* prevent multiple execution. */
971 mutex_lock(&etr_work_mutex);
973 /* Create working copy of etr_eacr. */
976 /* Check for the different events and their immediate effects. */
977 eacr = etr_handle_events(eacr);
979 /* Check if ETR is supposed to be active. */
980 eacr.ea = eacr.p0 || eacr.p1;
982 /* Both ports offline. Reset everything. */
983 eacr.dp = eacr.es = eacr.sl = 0;
984 on_each_cpu(disable_sync_clock, NULL, 1);
985 del_timer_sync(&etr_timer);
986 etr_update_eacr(eacr);
990 /* Store aib to get the current ETR status word. */
991 BUG_ON(etr_stetr(&aib) != 0);
992 etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
996 * Update the port information if the last stepping port change
997 * or data port change is older than 1.6 seconds.
999 if (now >= etr_tolec + (1600000 << 12))
1000 eacr = etr_handle_update(&aib, eacr);
1003 * Select ports to enable. The prefered synchronization mode is PPS.
1004 * If a port can be enabled depends on a number of things:
1005 * 1) The port needs to be online and uptodate. A port is not
1006 * disabled just because it is not uptodate, but it is only
1007 * enabled if it is uptodate.
1008 * 2) The port needs to have the same mode (pps / etr).
1009 * 3) The port needs to be usable -> etr_port_valid() == 1
1010 * 4) To enable the second port the clock needs to be in sync.
1011 * 5) If both ports are useable and are ETR ports, the network id
1012 * has to be the same.
1013 * The eacr.sl bit is used to indicate etr mode vs. pps mode.
1015 if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
1018 if (!etr_mode_is_pps(etr_eacr))
1020 if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
1022 // FIXME: uptodate checks ?
1023 else if (etr_port0_uptodate && etr_port1_uptodate)
1025 sync_port = (etr_port0_uptodate &&
1026 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1027 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
1031 if (!etr_mode_is_pps(etr_eacr))
1033 sync_port = (etr_port1_uptodate &&
1034 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1035 } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
1038 if (!etr_mode_is_etr(etr_eacr))
1040 if (!eacr.es || !eacr.p1 ||
1041 aib.esw.psc1 != etr_lpsc_operational_alt)
1043 else if (etr_port0_uptodate && etr_port1_uptodate &&
1044 etr_compare_network(&etr_port0, &etr_port1))
1046 sync_port = (etr_port0_uptodate &&
1047 etr_port_valid(&etr_port0, 0)) ? 0 : -1;
1048 } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
1052 if (!etr_mode_is_etr(etr_eacr))
1054 sync_port = (etr_port1_uptodate &&
1055 etr_port_valid(&etr_port1, 1)) ? 1 : -1;
1057 /* Both ports not usable. */
1058 eacr.es = eacr.sl = 0;
1063 * If the clock is in sync just update the eacr and return.
1064 * If there is no valid sync port wait for a port update.
1066 if (check_sync_clock() || sync_port < 0) {
1067 etr_update_eacr(eacr);
1068 etr_set_tolec_timeout(now);
1073 * Prepare control register for clock syncing
1074 * (reset data port bit, set sync check control.
1080 * Update eacr and try to synchronize the clock. If the update
1081 * of eacr caused a stepping port switch (or if we have to
1082 * assume that a stepping port switch has occured) or the
1083 * clock syncing failed, reset the sync check control bit
1084 * and set up a timer to try again after 0.5 seconds
1086 etr_update_eacr(eacr);
1087 if (now < etr_tolec + (1600000 << 12) ||
1088 etr_sync_clock_stop(&aib, sync_port) != 0) {
1089 /* Sync failed. Try again in 1/2 second. */
1091 etr_update_eacr(eacr);
1092 etr_set_sync_timeout();
1094 etr_set_tolec_timeout(now);
1096 mutex_unlock(&etr_work_mutex);
1100 * Sysfs interface functions
1102 static struct sysdev_class etr_sysclass = {
1106 static struct sys_device etr_port0_dev = {
1108 .cls = &etr_sysclass,
1111 static struct sys_device etr_port1_dev = {
1113 .cls = &etr_sysclass,
1117 * ETR class attributes
1119 static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf)
1121 return sprintf(buf, "%i\n", etr_port0.esw.p);
1124 static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
1126 static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf)
1130 if (etr_mode_is_pps(etr_eacr))
1132 else if (etr_mode_is_etr(etr_eacr))
1136 return sprintf(buf, "%s\n", mode_str);
1139 static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
1142 * ETR port attributes
1144 static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev)
1146 if (dev == &etr_port0_dev)
1147 return etr_port0_online ? &etr_port0 : NULL;
1149 return etr_port1_online ? &etr_port1 : NULL;
1152 static ssize_t etr_online_show(struct sys_device *dev,
1153 struct sysdev_attribute *attr,
1156 unsigned int online;
1158 online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
1159 return sprintf(buf, "%i\n", online);
1162 static ssize_t etr_online_store(struct sys_device *dev,
1163 struct sysdev_attribute *attr,
1164 const char *buf, size_t count)
1168 value = simple_strtoul(buf, NULL, 0);
1169 if (value != 0 && value != 1)
1171 if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
1173 mutex_lock(&clock_sync_mutex);
1174 if (dev == &etr_port0_dev) {
1175 if (etr_port0_online == value)
1176 goto out; /* Nothing to do. */
1177 etr_port0_online = value;
1178 if (etr_port0_online && etr_port1_online)
1179 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1181 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1182 set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
1183 queue_work(time_sync_wq, &etr_work);
1185 if (etr_port1_online == value)
1186 goto out; /* Nothing to do. */
1187 etr_port1_online = value;
1188 if (etr_port0_online && etr_port1_online)
1189 set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1191 clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
1192 set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
1193 queue_work(time_sync_wq, &etr_work);
1196 mutex_unlock(&clock_sync_mutex);
1200 static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store);
1202 static ssize_t etr_stepping_control_show(struct sys_device *dev,
1203 struct sysdev_attribute *attr,
1206 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1207 etr_eacr.e0 : etr_eacr.e1);
1210 static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
1212 static ssize_t etr_mode_code_show(struct sys_device *dev,
1213 struct sysdev_attribute *attr, char *buf)
1215 if (!etr_port0_online && !etr_port1_online)
1216 /* Status word is not uptodate if both ports are offline. */
1218 return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
1219 etr_port0.esw.psc0 : etr_port0.esw.psc1);
1222 static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL);
1224 static ssize_t etr_untuned_show(struct sys_device *dev,
1225 struct sysdev_attribute *attr, char *buf)
1227 struct etr_aib *aib = etr_aib_from_dev(dev);
1229 if (!aib || !aib->slsw.v1)
1231 return sprintf(buf, "%i\n", aib->edf1.u);
1234 static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL);
1236 static ssize_t etr_network_id_show(struct sys_device *dev,
1237 struct sysdev_attribute *attr, char *buf)
1239 struct etr_aib *aib = etr_aib_from_dev(dev);
1241 if (!aib || !aib->slsw.v1)
1243 return sprintf(buf, "%i\n", aib->edf1.net_id);
1246 static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL);
1248 static ssize_t etr_id_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.etr_id);
1258 static SYSDEV_ATTR(id, 0400, etr_id_show, NULL);
1260 static ssize_t etr_port_number_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.etr_pn);
1270 static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL);
1272 static ssize_t etr_coupled_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.v3)
1279 return sprintf(buf, "%i\n", aib->edf3.c);
1282 static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL);
1284 static ssize_t etr_local_time_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.v3)
1291 return sprintf(buf, "%i\n", aib->edf3.blto);
1294 static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL);
1296 static ssize_t etr_utc_offset_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.buo);
1306 static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
1308 static struct sysdev_attribute *etr_port_attributes[] = {
1310 &attr_stepping_control,
1322 static int __init etr_register_port(struct sys_device *dev)
1324 struct sysdev_attribute **attr;
1327 rc = sysdev_register(dev);
1330 for (attr = etr_port_attributes; *attr; attr++) {
1331 rc = sysdev_create_file(dev, *attr);
1337 for (; attr >= etr_port_attributes; attr--)
1338 sysdev_remove_file(dev, *attr);
1339 sysdev_unregister(dev);
1344 static void __init etr_unregister_port(struct sys_device *dev)
1346 struct sysdev_attribute **attr;
1348 for (attr = etr_port_attributes; *attr; attr++)
1349 sysdev_remove_file(dev, *attr);
1350 sysdev_unregister(dev);
1353 static int __init etr_init_sysfs(void)
1357 rc = sysdev_class_register(&etr_sysclass);
1360 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port);
1362 goto out_unreg_class;
1363 rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode);
1365 goto out_remove_stepping_port;
1366 rc = etr_register_port(&etr_port0_dev);
1368 goto out_remove_stepping_mode;
1369 rc = etr_register_port(&etr_port1_dev);
1371 goto out_remove_port0;
1375 etr_unregister_port(&etr_port0_dev);
1376 out_remove_stepping_mode:
1377 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode);
1378 out_remove_stepping_port:
1379 sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port);
1381 sysdev_class_unregister(&etr_sysclass);
1386 device_initcall(etr_init_sysfs);
1389 * Server Time Protocol (STP) code.
1391 static int stp_online;
1392 static struct stp_sstpi stp_info;
1393 static void *stp_page;
1395 static void stp_work_fn(struct work_struct *work);
1396 static DEFINE_MUTEX(stp_work_mutex);
1397 static DECLARE_WORK(stp_work, stp_work_fn);
1398 static struct timer_list stp_timer;
1400 static int __init early_parse_stp(char *p)
1402 if (strncmp(p, "off", 3) == 0)
1404 else if (strncmp(p, "on", 2) == 0)
1408 early_param("stp", early_parse_stp);
1411 * Reset STP attachment.
1413 static void __init stp_reset(void)
1417 stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
1418 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1420 set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
1421 else if (stp_online) {
1422 pr_warning("The real or virtual hardware system does "
1423 "not provide an STP interface\n");
1424 free_page((unsigned long) stp_page);
1430 static void stp_timeout(unsigned long dummy)
1432 queue_work(time_sync_wq, &stp_work);
1435 static int __init stp_init(void)
1437 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1439 setup_timer(&stp_timer, stp_timeout, 0UL);
1443 queue_work(time_sync_wq, &stp_work);
1447 arch_initcall(stp_init);
1450 * STP timing alert. There are three causes:
1451 * 1) timing status change
1452 * 2) link availability change
1453 * 3) time control parameter change
1454 * In all three cases we are only interested in the clock source state.
1455 * If a STP clock source is now available use it.
1457 static void stp_timing_alert(struct stp_irq_parm *intparm)
1459 if (intparm->tsc || intparm->lac || intparm->tcpc)
1460 queue_work(time_sync_wq, &stp_work);
1464 * STP sync check machine check. This is called when the timing state
1465 * changes from the synchronized state to the unsynchronized state.
1466 * After a STP sync check the clock is not in sync. The machine check
1467 * is broadcasted to all cpus at the same time.
1469 void stp_sync_check(void)
1471 disable_sync_clock(NULL);
1472 queue_work(time_sync_wq, &stp_work);
1476 * STP island condition machine check. This is called when an attached
1477 * server attempts to communicate over an STP link and the servers
1478 * have matching CTN ids and have a valid stratum-1 configuration
1479 * but the configurations do not match.
1481 void stp_island_check(void)
1483 disable_sync_clock(NULL);
1484 queue_work(time_sync_wq, &stp_work);
1488 static int stp_sync_clock(void *data)
1491 unsigned long long old_clock, delta;
1492 struct clock_sync_data *stp_sync;
1497 if (xchg(&first, 1) == 1) {
1499 clock_sync_cpu(stp_sync);
1503 /* Wait until all other cpus entered the sync function. */
1504 while (atomic_read(&stp_sync->cpus) != 0)
1507 enable_sync_clock();
1510 if (stp_info.todoff[0] || stp_info.todoff[1] ||
1511 stp_info.todoff[2] || stp_info.todoff[3] ||
1512 stp_info.tmd != 2) {
1513 old_clock = get_clock();
1514 rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
1516 delta = adjust_time(old_clock, get_clock(), 0);
1517 fixup_clock_comparator(delta);
1518 rc = chsc_sstpi(stp_page, &stp_info,
1519 sizeof(struct stp_sstpi));
1520 if (rc == 0 && stp_info.tmd != 2)
1525 disable_sync_clock(NULL);
1526 stp_sync->in_sync = -EAGAIN;
1528 stp_sync->in_sync = 1;
1534 * STP work. Check for the STP state and take over the clock
1535 * synchronization if the STP clock source is usable.
1537 static void stp_work_fn(struct work_struct *work)
1539 struct clock_sync_data stp_sync;
1542 /* prevent multiple execution. */
1543 mutex_lock(&stp_work_mutex);
1546 chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
1547 del_timer_sync(&stp_timer);
1551 rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
1555 rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
1556 if (rc || stp_info.c == 0)
1559 /* Skip synchronization if the clock is already in sync. */
1560 if (check_sync_clock())
1563 memset(&stp_sync, 0, sizeof(stp_sync));
1565 atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
1566 stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
1569 if (!check_sync_clock())
1571 * There is a usable clock but the synchonization failed.
1572 * Retry after a second.
1574 mod_timer(&stp_timer, jiffies + HZ);
1577 mutex_unlock(&stp_work_mutex);
1581 * STP class sysfs interface functions
1583 static struct sysdev_class stp_sysclass = {
1587 static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf)
1591 return sprintf(buf, "%016llx\n",
1592 *(unsigned long long *) stp_info.ctnid);
1595 static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
1597 static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf)
1601 return sprintf(buf, "%i\n", stp_info.ctn);
1604 static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
1606 static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf)
1608 if (!stp_online || !(stp_info.vbits & 0x2000))
1610 return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
1613 static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
1615 static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf)
1617 if (!stp_online || !(stp_info.vbits & 0x8000))
1619 return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
1622 static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
1624 static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf)
1628 return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
1631 static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL);
1633 static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf)
1635 if (!stp_online || !(stp_info.vbits & 0x0800))
1637 return sprintf(buf, "%i\n", (int) stp_info.tto);
1640 static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
1642 static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, char *buf)
1644 if (!stp_online || !(stp_info.vbits & 0x4000))
1646 return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
1649 static SYSDEV_CLASS_ATTR(time_zone_offset, 0400,
1650 stp_time_zone_offset_show, NULL);
1652 static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf)
1656 return sprintf(buf, "%i\n", stp_info.tmd);
1659 static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
1661 static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf)
1665 return sprintf(buf, "%i\n", stp_info.tst);
1668 static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
1670 static ssize_t stp_online_show(struct sysdev_class *class, char *buf)
1672 return sprintf(buf, "%i\n", stp_online);
1675 static ssize_t stp_online_store(struct sysdev_class *class,
1676 const char *buf, size_t count)
1680 value = simple_strtoul(buf, NULL, 0);
1681 if (value != 0 && value != 1)
1683 if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
1685 mutex_lock(&clock_sync_mutex);
1688 set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1690 clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
1691 queue_work(time_sync_wq, &stp_work);
1692 mutex_unlock(&clock_sync_mutex);
1697 * Can't use SYSDEV_CLASS_ATTR because the attribute should be named
1698 * stp/online but attr_online already exists in this file ..
1700 static struct sysdev_class_attribute attr_stp_online = {
1701 .attr = { .name = "online", .mode = 0600 },
1702 .show = stp_online_show,
1703 .store = stp_online_store,
1706 static struct sysdev_class_attribute *stp_attributes[] = {
1714 &attr_time_zone_offset,
1720 static int __init stp_init_sysfs(void)
1722 struct sysdev_class_attribute **attr;
1725 rc = sysdev_class_register(&stp_sysclass);
1728 for (attr = stp_attributes; *attr; attr++) {
1729 rc = sysdev_class_create_file(&stp_sysclass, *attr);
1735 for (; attr >= stp_attributes; attr--)
1736 sysdev_class_remove_file(&stp_sysclass, *attr);
1737 sysdev_class_unregister(&stp_sysclass);
1742 device_initcall(stp_init_sysfs);