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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/time.c | |
3 | * Time of day based timer functions. | |
4 | * | |
5 | * S390 version | |
d2fec595 | 6 | * Copyright IBM Corp. 1999, 2008 |
1da177e4 LT |
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) | |
10 | * | |
11 | * Derived from "arch/i386/kernel/time.c" | |
12 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/param.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/time.h> | |
3367b994 | 24 | #include <linux/sysdev.h> |
1da177e4 LT |
25 | #include <linux/delay.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/smp.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/profile.h> | |
30 | #include <linux/timex.h> | |
31 | #include <linux/notifier.h> | |
dc64bef5 | 32 | #include <linux/clocksource.h> |
5a62b192 | 33 | #include <linux/clockchips.h> |
d2fec595 | 34 | #include <linux/bootmem.h> |
1da177e4 LT |
35 | #include <asm/uaccess.h> |
36 | #include <asm/delay.h> | |
37 | #include <asm/s390_ext.h> | |
38 | #include <asm/div64.h> | |
39 | #include <asm/irq.h> | |
5a489b98 | 40 | #include <asm/irq_regs.h> |
1da177e4 | 41 | #include <asm/timer.h> |
d54853ef | 42 | #include <asm/etr.h> |
a806170e | 43 | #include <asm/cio.h> |
1da177e4 LT |
44 | |
45 | /* change this if you have some constant time drift */ | |
46 | #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ) | |
47 | #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12) | |
48 | ||
d54853ef MS |
49 | /* The value of the TOD clock for 1.1.1970. */ |
50 | #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL | |
51 | ||
1da177e4 LT |
52 | /* |
53 | * Create a small time difference between the timer interrupts | |
54 | * on the different cpus to avoid lock contention. | |
55 | */ | |
56 | #define CPU_DEVIATION (smp_processor_id() << 12) | |
57 | ||
58 | #define TICK_SIZE tick | |
59 | ||
1da177e4 | 60 | static ext_int_info_t ext_int_info_cc; |
d54853ef | 61 | static ext_int_info_t ext_int_etr_cc; |
1da177e4 | 62 | static u64 jiffies_timer_cc; |
5a62b192 HC |
63 | |
64 | static DEFINE_PER_CPU(struct clock_event_device, comparators); | |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* |
67 | * Scheduler clock - returns current time in nanosec units. | |
68 | */ | |
69 | unsigned long long sched_clock(void) | |
70 | { | |
c0015f91 | 71 | return ((get_clock_xt() - jiffies_timer_cc) * 125) >> 9; |
1da177e4 LT |
72 | } |
73 | ||
32f65f27 JG |
74 | /* |
75 | * Monotonic_clock - returns # of nanoseconds passed since time_init() | |
76 | */ | |
77 | unsigned long long monotonic_clock(void) | |
78 | { | |
79 | return sched_clock(); | |
80 | } | |
81 | EXPORT_SYMBOL(monotonic_clock); | |
82 | ||
1da177e4 LT |
83 | void tod_to_timeval(__u64 todval, struct timespec *xtime) |
84 | { | |
85 | unsigned long long sec; | |
86 | ||
87 | sec = todval >> 12; | |
88 | do_div(sec, 1000000); | |
89 | xtime->tv_sec = sec; | |
90 | todval -= (sec * 1000000) << 12; | |
91 | xtime->tv_nsec = ((todval * 1000) >> 12); | |
92 | } | |
93 | ||
1da177e4 | 94 | #ifdef CONFIG_PROFILING |
5a489b98 | 95 | #define s390_do_profile() profile_tick(CPU_PROFILING) |
1da177e4 | 96 | #else |
5a489b98 | 97 | #define s390_do_profile() do { ; } while(0) |
1da177e4 LT |
98 | #endif /* CONFIG_PROFILING */ |
99 | ||
5a62b192 | 100 | void clock_comparator_work(void) |
1da177e4 | 101 | { |
5a62b192 | 102 | struct clock_event_device *cd; |
1da177e4 | 103 | |
5a62b192 HC |
104 | S390_lowcore.clock_comparator = -1ULL; |
105 | set_clock_comparator(S390_lowcore.clock_comparator); | |
106 | cd = &__get_cpu_var(comparators); | |
107 | cd->event_handler(cd); | |
5a489b98 | 108 | s390_do_profile(); |
1da177e4 LT |
109 | } |
110 | ||
1da177e4 | 111 | /* |
5a62b192 | 112 | * Fixup the clock comparator. |
1da177e4 | 113 | */ |
5a62b192 | 114 | static void fixup_clock_comparator(unsigned long long delta) |
1da177e4 | 115 | { |
5a62b192 HC |
116 | /* If nobody is waiting there's nothing to fix. */ |
117 | if (S390_lowcore.clock_comparator == -1ULL) | |
1da177e4 | 118 | return; |
5a62b192 HC |
119 | S390_lowcore.clock_comparator += delta; |
120 | set_clock_comparator(S390_lowcore.clock_comparator); | |
1da177e4 LT |
121 | } |
122 | ||
5a62b192 HC |
123 | static int s390_next_event(unsigned long delta, |
124 | struct clock_event_device *evt) | |
1da177e4 | 125 | { |
5a62b192 HC |
126 | S390_lowcore.clock_comparator = get_clock() + delta; |
127 | set_clock_comparator(S390_lowcore.clock_comparator); | |
128 | return 0; | |
1da177e4 LT |
129 | } |
130 | ||
5a62b192 HC |
131 | static void s390_set_mode(enum clock_event_mode mode, |
132 | struct clock_event_device *evt) | |
1da177e4 | 133 | { |
d54853ef MS |
134 | } |
135 | ||
136 | /* | |
137 | * Set up lowcore and control register of the current cpu to | |
138 | * enable TOD clock and clock comparator interrupts. | |
1da177e4 LT |
139 | */ |
140 | void init_cpu_timer(void) | |
141 | { | |
5a62b192 HC |
142 | struct clock_event_device *cd; |
143 | int cpu; | |
144 | ||
145 | S390_lowcore.clock_comparator = -1ULL; | |
146 | set_clock_comparator(S390_lowcore.clock_comparator); | |
147 | ||
148 | cpu = smp_processor_id(); | |
149 | cd = &per_cpu(comparators, cpu); | |
150 | cd->name = "comparator"; | |
151 | cd->features = CLOCK_EVT_FEAT_ONESHOT; | |
152 | cd->mult = 16777; | |
153 | cd->shift = 12; | |
154 | cd->min_delta_ns = 1; | |
155 | cd->max_delta_ns = LONG_MAX; | |
156 | cd->rating = 400; | |
157 | cd->cpumask = cpumask_of_cpu(cpu); | |
158 | cd->set_next_event = s390_next_event; | |
159 | cd->set_mode = s390_set_mode; | |
160 | ||
161 | clockevents_register_device(cd); | |
d54853ef MS |
162 | |
163 | /* Enable clock comparator timer interrupt. */ | |
164 | __ctl_set_bit(0,11); | |
165 | ||
d2fec595 | 166 | /* Always allow the timing alert external interrupt. */ |
d54853ef MS |
167 | __ctl_set_bit(0, 4); |
168 | } | |
169 | ||
170 | static void clock_comparator_interrupt(__u16 code) | |
171 | { | |
d54853ef MS |
172 | } |
173 | ||
d2fec595 MS |
174 | static void etr_timing_alert(struct etr_irq_parm *); |
175 | static void stp_timing_alert(struct stp_irq_parm *); | |
176 | ||
177 | static void timing_alert_interrupt(__u16 code) | |
178 | { | |
179 | if (S390_lowcore.ext_params & 0x00c40000) | |
180 | etr_timing_alert((struct etr_irq_parm *) | |
181 | &S390_lowcore.ext_params); | |
182 | if (S390_lowcore.ext_params & 0x00038000) | |
183 | stp_timing_alert((struct stp_irq_parm *) | |
184 | &S390_lowcore.ext_params); | |
185 | } | |
186 | ||
d54853ef | 187 | static void etr_reset(void); |
d2fec595 | 188 | static void stp_reset(void); |
d54853ef MS |
189 | |
190 | /* | |
191 | * Get the TOD clock running. | |
192 | */ | |
193 | static u64 __init reset_tod_clock(void) | |
194 | { | |
195 | u64 time; | |
196 | ||
197 | etr_reset(); | |
d2fec595 | 198 | stp_reset(); |
d54853ef MS |
199 | if (store_clock(&time) == 0) |
200 | return time; | |
201 | /* TOD clock not running. Set the clock to Unix Epoch. */ | |
202 | if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) | |
203 | panic("TOD clock not operational."); | |
1da177e4 | 204 | |
d54853ef | 205 | return TOD_UNIX_EPOCH; |
1da177e4 LT |
206 | } |
207 | ||
dc64bef5 MS |
208 | static cycle_t read_tod_clock(void) |
209 | { | |
210 | return get_clock(); | |
211 | } | |
212 | ||
213 | static struct clocksource clocksource_tod = { | |
214 | .name = "tod", | |
d2cb0e6e | 215 | .rating = 400, |
dc64bef5 MS |
216 | .read = read_tod_clock, |
217 | .mask = -1ULL, | |
218 | .mult = 1000, | |
219 | .shift = 12, | |
cc02d809 | 220 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
dc64bef5 MS |
221 | }; |
222 | ||
223 | ||
1da177e4 LT |
224 | /* |
225 | * Initialize the TOD clock and the CPU timer of | |
226 | * the boot cpu. | |
227 | */ | |
228 | void __init time_init(void) | |
229 | { | |
5a62b192 HC |
230 | u64 init_timer_cc; |
231 | ||
d54853ef | 232 | init_timer_cc = reset_tod_clock(); |
1da177e4 LT |
233 | jiffies_timer_cc = init_timer_cc - jiffies_64 * CLK_TICKS_PER_JIFFY; |
234 | ||
235 | /* set xtime */ | |
d54853ef | 236 | tod_to_timeval(init_timer_cc - TOD_UNIX_EPOCH, &xtime); |
1da177e4 LT |
237 | set_normalized_timespec(&wall_to_monotonic, |
238 | -xtime.tv_sec, -xtime.tv_nsec); | |
239 | ||
240 | /* request the clock comparator external interrupt */ | |
d54853ef MS |
241 | if (register_early_external_interrupt(0x1004, |
242 | clock_comparator_interrupt, | |
1da177e4 LT |
243 | &ext_int_info_cc) != 0) |
244 | panic("Couldn't request external interrupt 0x1004"); | |
245 | ||
dc64bef5 MS |
246 | if (clocksource_register(&clocksource_tod) != 0) |
247 | panic("Could not register TOD clock source"); | |
248 | ||
d2fec595 MS |
249 | /* request the timing alert external interrupt */ |
250 | if (register_early_external_interrupt(0x1406, | |
251 | timing_alert_interrupt, | |
d54853ef MS |
252 | &ext_int_etr_cc) != 0) |
253 | panic("Couldn't request external interrupt 0x1406"); | |
254 | ||
255 | /* Enable TOD clock interrupts on the boot cpu. */ | |
256 | init_cpu_timer(); | |
1da177e4 | 257 | |
1da177e4 LT |
258 | #ifdef CONFIG_VIRT_TIMER |
259 | vtime_init(); | |
260 | #endif | |
d54853ef MS |
261 | } |
262 | ||
d2fec595 MS |
263 | /* |
264 | * The time is "clock". old is what we think the time is. | |
265 | * Adjust the value by a multiple of jiffies and add the delta to ntp. | |
266 | * "delay" is an approximation how long the synchronization took. If | |
267 | * the time correction is positive, then "delay" is subtracted from | |
268 | * the time difference and only the remaining part is passed to ntp. | |
269 | */ | |
270 | static unsigned long long adjust_time(unsigned long long old, | |
271 | unsigned long long clock, | |
272 | unsigned long long delay) | |
273 | { | |
274 | unsigned long long delta, ticks; | |
275 | struct timex adjust; | |
276 | ||
277 | if (clock > old) { | |
278 | /* It is later than we thought. */ | |
279 | delta = ticks = clock - old; | |
280 | delta = ticks = (delta < delay) ? 0 : delta - delay; | |
281 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); | |
282 | adjust.offset = ticks * (1000000 / HZ); | |
283 | } else { | |
284 | /* It is earlier than we thought. */ | |
285 | delta = ticks = old - clock; | |
286 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); | |
287 | delta = -delta; | |
288 | adjust.offset = -ticks * (1000000 / HZ); | |
289 | } | |
290 | jiffies_timer_cc += delta; | |
291 | if (adjust.offset != 0) { | |
292 | printk(KERN_NOTICE "etr: time adjusted by %li micro-seconds\n", | |
293 | adjust.offset); | |
294 | adjust.modes = ADJ_OFFSET_SINGLESHOT; | |
295 | do_adjtimex(&adjust); | |
296 | } | |
297 | return delta; | |
298 | } | |
299 | ||
300 | static DEFINE_PER_CPU(atomic_t, clock_sync_word); | |
301 | static unsigned long clock_sync_flags; | |
302 | ||
303 | #define CLOCK_SYNC_HAS_ETR 0 | |
304 | #define CLOCK_SYNC_HAS_STP 1 | |
305 | #define CLOCK_SYNC_ETR 2 | |
306 | #define CLOCK_SYNC_STP 3 | |
307 | ||
308 | /* | |
309 | * The synchronous get_clock function. It will write the current clock | |
310 | * value to the clock pointer and return 0 if the clock is in sync with | |
311 | * the external time source. If the clock mode is local it will return | |
312 | * -ENOSYS and -EAGAIN if the clock is not in sync with the external | |
313 | * reference. | |
314 | */ | |
315 | int get_sync_clock(unsigned long long *clock) | |
316 | { | |
317 | atomic_t *sw_ptr; | |
318 | unsigned int sw0, sw1; | |
319 | ||
320 | sw_ptr = &get_cpu_var(clock_sync_word); | |
321 | sw0 = atomic_read(sw_ptr); | |
322 | *clock = get_clock(); | |
323 | sw1 = atomic_read(sw_ptr); | |
324 | put_cpu_var(clock_sync_sync); | |
325 | if (sw0 == sw1 && (sw0 & 0x80000000U)) | |
326 | /* Success: time is in sync. */ | |
327 | return 0; | |
328 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) && | |
329 | !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) | |
330 | return -ENOSYS; | |
331 | if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) && | |
332 | !test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) | |
333 | return -EACCES; | |
334 | return -EAGAIN; | |
335 | } | |
336 | EXPORT_SYMBOL(get_sync_clock); | |
337 | ||
338 | /* | |
339 | * Make get_sync_clock return -EAGAIN. | |
340 | */ | |
341 | static void disable_sync_clock(void *dummy) | |
342 | { | |
343 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); | |
344 | /* | |
345 | * Clear the in-sync bit 2^31. All get_sync_clock calls will | |
346 | * fail until the sync bit is turned back on. In addition | |
347 | * increase the "sequence" counter to avoid the race of an | |
348 | * etr event and the complete recovery against get_sync_clock. | |
349 | */ | |
350 | atomic_clear_mask(0x80000000, sw_ptr); | |
351 | atomic_inc(sw_ptr); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Make get_sync_clock return 0 again. | |
356 | * Needs to be called from a context disabled for preemption. | |
357 | */ | |
358 | static void enable_sync_clock(void) | |
359 | { | |
360 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); | |
361 | atomic_set_mask(0x80000000, sw_ptr); | |
362 | } | |
363 | ||
d54853ef MS |
364 | /* |
365 | * External Time Reference (ETR) code. | |
366 | */ | |
367 | static int etr_port0_online; | |
368 | static int etr_port1_online; | |
d2fec595 | 369 | static int etr_steai_available; |
d54853ef MS |
370 | |
371 | static int __init early_parse_etr(char *p) | |
372 | { | |
373 | if (strncmp(p, "off", 3) == 0) | |
374 | etr_port0_online = etr_port1_online = 0; | |
375 | else if (strncmp(p, "port0", 5) == 0) | |
376 | etr_port0_online = 1; | |
377 | else if (strncmp(p, "port1", 5) == 0) | |
378 | etr_port1_online = 1; | |
379 | else if (strncmp(p, "on", 2) == 0) | |
380 | etr_port0_online = etr_port1_online = 1; | |
381 | return 0; | |
382 | } | |
383 | early_param("etr", early_parse_etr); | |
384 | ||
385 | enum etr_event { | |
386 | ETR_EVENT_PORT0_CHANGE, | |
387 | ETR_EVENT_PORT1_CHANGE, | |
388 | ETR_EVENT_PORT_ALERT, | |
389 | ETR_EVENT_SYNC_CHECK, | |
390 | ETR_EVENT_SWITCH_LOCAL, | |
391 | ETR_EVENT_UPDATE, | |
392 | }; | |
393 | ||
d54853ef MS |
394 | /* |
395 | * Valid bit combinations of the eacr register are (x = don't care): | |
396 | * e0 e1 dp p0 p1 ea es sl | |
397 | * 0 0 x 0 0 0 0 0 initial, disabled state | |
398 | * 0 0 x 0 1 1 0 0 port 1 online | |
399 | * 0 0 x 1 0 1 0 0 port 0 online | |
400 | * 0 0 x 1 1 1 0 0 both ports online | |
401 | * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode | |
402 | * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode | |
403 | * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync | |
404 | * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync | |
405 | * 0 1 x 1 1 1 0 0 both ports online, port 1 usable | |
406 | * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync | |
407 | * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync | |
408 | * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode | |
409 | * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode | |
410 | * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync | |
411 | * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync | |
412 | * 1 0 x 1 1 1 0 0 both ports online, port 0 usable | |
413 | * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync | |
414 | * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync | |
415 | * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync | |
416 | * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync | |
417 | */ | |
418 | static struct etr_eacr etr_eacr; | |
419 | static u64 etr_tolec; /* time of last eacr update */ | |
d54853ef MS |
420 | static struct etr_aib etr_port0; |
421 | static int etr_port0_uptodate; | |
422 | static struct etr_aib etr_port1; | |
423 | static int etr_port1_uptodate; | |
424 | static unsigned long etr_events; | |
425 | static struct timer_list etr_timer; | |
d54853ef MS |
426 | |
427 | static void etr_timeout(unsigned long dummy); | |
ecdcc023 MS |
428 | static void etr_work_fn(struct work_struct *work); |
429 | static DECLARE_WORK(etr_work, etr_work_fn); | |
d54853ef | 430 | |
d54853ef MS |
431 | /* |
432 | * Reset ETR attachment. | |
433 | */ | |
434 | static void etr_reset(void) | |
435 | { | |
436 | etr_eacr = (struct etr_eacr) { | |
437 | .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0, | |
438 | .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0, | |
439 | .es = 0, .sl = 0 }; | |
d2fec595 | 440 | if (etr_setr(&etr_eacr) == 0) { |
d54853ef | 441 | etr_tolec = get_clock(); |
d2fec595 MS |
442 | set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags); |
443 | } else if (etr_port0_online || etr_port1_online) { | |
444 | printk(KERN_WARNING "Running on non ETR capable " | |
445 | "machine, only local mode available.\n"); | |
446 | etr_port0_online = etr_port1_online = 0; | |
d54853ef MS |
447 | } |
448 | } | |
449 | ||
ecdcc023 | 450 | static int __init etr_init(void) |
d54853ef MS |
451 | { |
452 | struct etr_aib aib; | |
453 | ||
d2fec595 | 454 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
ecdcc023 | 455 | return 0; |
d54853ef MS |
456 | /* Check if this machine has the steai instruction. */ |
457 | if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0) | |
d2fec595 | 458 | etr_steai_available = 1; |
d54853ef | 459 | setup_timer(&etr_timer, etr_timeout, 0UL); |
d54853ef MS |
460 | if (etr_port0_online) { |
461 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); | |
ecdcc023 | 462 | schedule_work(&etr_work); |
d54853ef MS |
463 | } |
464 | if (etr_port1_online) { | |
465 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); | |
ecdcc023 | 466 | schedule_work(&etr_work); |
d54853ef | 467 | } |
ecdcc023 | 468 | return 0; |
d54853ef MS |
469 | } |
470 | ||
ecdcc023 MS |
471 | arch_initcall(etr_init); |
472 | ||
d54853ef MS |
473 | /* |
474 | * Two sorts of ETR machine checks. The architecture reads: | |
475 | * "When a machine-check niterruption occurs and if a switch-to-local or | |
476 | * ETR-sync-check interrupt request is pending but disabled, this pending | |
477 | * disabled interruption request is indicated and is cleared". | |
478 | * Which means that we can get etr_switch_to_local events from the machine | |
479 | * check handler although the interruption condition is disabled. Lovely.. | |
480 | */ | |
481 | ||
482 | /* | |
483 | * Switch to local machine check. This is called when the last usable | |
484 | * ETR port goes inactive. After switch to local the clock is not in sync. | |
485 | */ | |
486 | void etr_switch_to_local(void) | |
487 | { | |
488 | if (!etr_eacr.sl) | |
489 | return; | |
d2fec595 MS |
490 | if (test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
491 | disable_sync_clock(NULL); | |
d54853ef | 492 | set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events); |
ecdcc023 | 493 | schedule_work(&etr_work); |
d54853ef MS |
494 | } |
495 | ||
496 | /* | |
497 | * ETR sync check machine check. This is called when the ETR OTE and the | |
498 | * local clock OTE are farther apart than the ETR sync check tolerance. | |
499 | * After a ETR sync check the clock is not in sync. The machine check | |
500 | * is broadcasted to all cpus at the same time. | |
501 | */ | |
502 | void etr_sync_check(void) | |
503 | { | |
504 | if (!etr_eacr.es) | |
505 | return; | |
d2fec595 MS |
506 | if (test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
507 | disable_sync_clock(NULL); | |
d54853ef | 508 | set_bit(ETR_EVENT_SYNC_CHECK, &etr_events); |
ecdcc023 | 509 | schedule_work(&etr_work); |
d54853ef MS |
510 | } |
511 | ||
512 | /* | |
d2fec595 | 513 | * ETR timing alert. There are two causes: |
d54853ef MS |
514 | * 1) port state change, check the usability of the port |
515 | * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the | |
516 | * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3) | |
517 | * or ETR-data word 4 (edf4) has changed. | |
518 | */ | |
d2fec595 | 519 | static void etr_timing_alert(struct etr_irq_parm *intparm) |
d54853ef | 520 | { |
d54853ef MS |
521 | if (intparm->pc0) |
522 | /* ETR port 0 state change. */ | |
523 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); | |
524 | if (intparm->pc1) | |
525 | /* ETR port 1 state change. */ | |
526 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); | |
527 | if (intparm->eai) | |
528 | /* | |
529 | * ETR port alert on either port 0, 1 or both. | |
530 | * Both ports are not up-to-date now. | |
531 | */ | |
532 | set_bit(ETR_EVENT_PORT_ALERT, &etr_events); | |
ecdcc023 | 533 | schedule_work(&etr_work); |
d54853ef MS |
534 | } |
535 | ||
536 | static void etr_timeout(unsigned long dummy) | |
537 | { | |
538 | set_bit(ETR_EVENT_UPDATE, &etr_events); | |
ecdcc023 | 539 | schedule_work(&etr_work); |
d54853ef MS |
540 | } |
541 | ||
542 | /* | |
543 | * Check if the etr mode is pss. | |
544 | */ | |
545 | static inline int etr_mode_is_pps(struct etr_eacr eacr) | |
546 | { | |
547 | return eacr.es && !eacr.sl; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Check if the etr mode is etr. | |
552 | */ | |
553 | static inline int etr_mode_is_etr(struct etr_eacr eacr) | |
554 | { | |
555 | return eacr.es && eacr.sl; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Check if the port can be used for TOD synchronization. | |
560 | * For PPS mode the port has to receive OTEs. For ETR mode | |
561 | * the port has to receive OTEs, the ETR stepping bit has to | |
562 | * be zero and the validity bits for data frame 1, 2, and 3 | |
563 | * have to be 1. | |
564 | */ | |
565 | static int etr_port_valid(struct etr_aib *aib, int port) | |
566 | { | |
567 | unsigned int psc; | |
568 | ||
569 | /* Check that this port is receiving OTEs. */ | |
570 | if (aib->tsp == 0) | |
571 | return 0; | |
572 | ||
573 | psc = port ? aib->esw.psc1 : aib->esw.psc0; | |
574 | if (psc == etr_lpsc_pps_mode) | |
575 | return 1; | |
576 | if (psc == etr_lpsc_operational_step) | |
577 | return !aib->esw.y && aib->slsw.v1 && | |
578 | aib->slsw.v2 && aib->slsw.v3; | |
579 | return 0; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Check if two ports are on the same network. | |
584 | */ | |
585 | static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2) | |
586 | { | |
587 | // FIXME: any other fields we have to compare? | |
588 | return aib1->edf1.net_id == aib2->edf1.net_id; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Wrapper for etr_stei that converts physical port states | |
593 | * to logical port states to be consistent with the output | |
594 | * of stetr (see etr_psc vs. etr_lpsc). | |
595 | */ | |
596 | static void etr_steai_cv(struct etr_aib *aib, unsigned int func) | |
597 | { | |
598 | BUG_ON(etr_steai(aib, func) != 0); | |
599 | /* Convert port state to logical port state. */ | |
600 | if (aib->esw.psc0 == 1) | |
601 | aib->esw.psc0 = 2; | |
602 | else if (aib->esw.psc0 == 0 && aib->esw.p == 0) | |
603 | aib->esw.psc0 = 1; | |
604 | if (aib->esw.psc1 == 1) | |
605 | aib->esw.psc1 = 2; | |
606 | else if (aib->esw.psc1 == 0 && aib->esw.p == 1) | |
607 | aib->esw.psc1 = 1; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Check if the aib a2 is still connected to the same attachment as | |
612 | * aib a1, the etv values differ by one and a2 is valid. | |
613 | */ | |
614 | static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p) | |
615 | { | |
616 | int state_a1, state_a2; | |
617 | ||
618 | /* Paranoia check: e0/e1 should better be the same. */ | |
619 | if (a1->esw.eacr.e0 != a2->esw.eacr.e0 || | |
620 | a1->esw.eacr.e1 != a2->esw.eacr.e1) | |
621 | return 0; | |
622 | ||
623 | /* Still connected to the same etr ? */ | |
624 | state_a1 = p ? a1->esw.psc1 : a1->esw.psc0; | |
625 | state_a2 = p ? a2->esw.psc1 : a2->esw.psc0; | |
626 | if (state_a1 == etr_lpsc_operational_step) { | |
627 | if (state_a2 != etr_lpsc_operational_step || | |
628 | a1->edf1.net_id != a2->edf1.net_id || | |
629 | a1->edf1.etr_id != a2->edf1.etr_id || | |
630 | a1->edf1.etr_pn != a2->edf1.etr_pn) | |
631 | return 0; | |
632 | } else if (state_a2 != etr_lpsc_pps_mode) | |
633 | return 0; | |
634 | ||
635 | /* The ETV value of a2 needs to be ETV of a1 + 1. */ | |
636 | if (a1->edf2.etv + 1 != a2->edf2.etv) | |
637 | return 0; | |
638 | ||
639 | if (!etr_port_valid(a2, p)) | |
640 | return 0; | |
641 | ||
642 | return 1; | |
643 | } | |
644 | ||
d2fec595 | 645 | struct clock_sync_data { |
5a62b192 HC |
646 | int in_sync; |
647 | unsigned long long fixup_cc; | |
d2fec595 | 648 | }; |
5a62b192 | 649 | |
d2fec595 | 650 | static void clock_sync_cpu_start(void *dummy) |
d54853ef | 651 | { |
d2fec595 MS |
652 | struct clock_sync_data *sync = dummy; |
653 | ||
654 | enable_sync_clock(); | |
d54853ef MS |
655 | /* |
656 | * This looks like a busy wait loop but it isn't. etr_sync_cpus | |
657 | * is called on all other cpus while the TOD clocks is stopped. | |
658 | * __udelay will stop the cpu on an enabled wait psw until the | |
659 | * TOD is running again. | |
660 | */ | |
d2fec595 | 661 | while (sync->in_sync == 0) { |
d54853ef | 662 | __udelay(1); |
6c732de2 HC |
663 | /* |
664 | * A different cpu changes *in_sync. Therefore use | |
665 | * barrier() to force memory access. | |
666 | */ | |
667 | barrier(); | |
668 | } | |
d2fec595 | 669 | if (sync->in_sync != 1) |
d54853ef | 670 | /* Didn't work. Clear per-cpu in sync bit again. */ |
d2fec595 | 671 | disable_sync_clock(NULL); |
d54853ef MS |
672 | /* |
673 | * This round of TOD syncing is done. Set the clock comparator | |
674 | * to the next tick and let the processor continue. | |
675 | */ | |
d2fec595 | 676 | fixup_clock_comparator(sync->fixup_cc); |
d54853ef MS |
677 | } |
678 | ||
d2fec595 | 679 | static void clock_sync_cpu_end(void *dummy) |
d54853ef MS |
680 | { |
681 | } | |
682 | ||
683 | /* | |
684 | * Sync the TOD clock using the port refered to by aibp. This port | |
685 | * has to be enabled and the other port has to be disabled. The | |
686 | * last eacr update has to be more than 1.6 seconds in the past. | |
687 | */ | |
688 | static int etr_sync_clock(struct etr_aib *aib, int port) | |
689 | { | |
690 | struct etr_aib *sync_port; | |
d2fec595 | 691 | struct clock_sync_data etr_sync; |
5a62b192 HC |
692 | unsigned long long clock, old_clock, delay, delta; |
693 | int follows; | |
d54853ef MS |
694 | int rc; |
695 | ||
696 | /* Check if the current aib is adjacent to the sync port aib. */ | |
697 | sync_port = (port == 0) ? &etr_port0 : &etr_port1; | |
698 | follows = etr_aib_follows(sync_port, aib, port); | |
699 | memcpy(sync_port, aib, sizeof(*aib)); | |
700 | if (!follows) | |
701 | return -EAGAIN; | |
702 | ||
703 | /* | |
704 | * Catch all other cpus and make them wait until we have | |
705 | * successfully synced the clock. smp_call_function will | |
706 | * return after all other cpus are in etr_sync_cpu_start. | |
707 | */ | |
5a62b192 | 708 | memset(&etr_sync, 0, sizeof(etr_sync)); |
d54853ef | 709 | preempt_disable(); |
1a781a77 | 710 | smp_call_function(clock_sync_cpu_start, &etr_sync, 0); |
d54853ef | 711 | local_irq_disable(); |
d2fec595 | 712 | enable_sync_clock(); |
d54853ef MS |
713 | |
714 | /* Set clock to next OTE. */ | |
715 | __ctl_set_bit(14, 21); | |
716 | __ctl_set_bit(0, 29); | |
717 | clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32; | |
5a62b192 | 718 | old_clock = get_clock(); |
d54853ef MS |
719 | if (set_clock(clock) == 0) { |
720 | __udelay(1); /* Wait for the clock to start. */ | |
721 | __ctl_clear_bit(0, 29); | |
722 | __ctl_clear_bit(14, 21); | |
723 | etr_stetr(aib); | |
724 | /* Adjust Linux timing variables. */ | |
725 | delay = (unsigned long long) | |
726 | (aib->edf2.etv - sync_port->edf2.etv) << 32; | |
d2fec595 | 727 | delta = adjust_time(old_clock, clock, delay); |
5a62b192 HC |
728 | etr_sync.fixup_cc = delta; |
729 | fixup_clock_comparator(delta); | |
d54853ef MS |
730 | /* Verify that the clock is properly set. */ |
731 | if (!etr_aib_follows(sync_port, aib, port)) { | |
732 | /* Didn't work. */ | |
d2fec595 | 733 | disable_sync_clock(NULL); |
5a62b192 | 734 | etr_sync.in_sync = -EAGAIN; |
d54853ef MS |
735 | rc = -EAGAIN; |
736 | } else { | |
5a62b192 | 737 | etr_sync.in_sync = 1; |
d54853ef MS |
738 | rc = 0; |
739 | } | |
740 | } else { | |
741 | /* Could not set the clock ?!? */ | |
742 | __ctl_clear_bit(0, 29); | |
743 | __ctl_clear_bit(14, 21); | |
d2fec595 | 744 | disable_sync_clock(NULL); |
5a62b192 | 745 | etr_sync.in_sync = -EAGAIN; |
d54853ef MS |
746 | rc = -EAGAIN; |
747 | } | |
748 | local_irq_enable(); | |
1a781a77 | 749 | smp_call_function(clock_sync_cpu_end, NULL, 0); |
d54853ef MS |
750 | preempt_enable(); |
751 | return rc; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Handle the immediate effects of the different events. | |
756 | * The port change event is used for online/offline changes. | |
757 | */ | |
758 | static struct etr_eacr etr_handle_events(struct etr_eacr eacr) | |
759 | { | |
760 | if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) | |
761 | eacr.es = 0; | |
762 | if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) | |
763 | eacr.es = eacr.sl = 0; | |
764 | if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events)) | |
765 | etr_port0_uptodate = etr_port1_uptodate = 0; | |
766 | ||
767 | if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) { | |
768 | if (eacr.e0) | |
769 | /* | |
770 | * Port change of an enabled port. We have to | |
771 | * assume that this can have caused an stepping | |
772 | * port switch. | |
773 | */ | |
774 | etr_tolec = get_clock(); | |
775 | eacr.p0 = etr_port0_online; | |
776 | if (!eacr.p0) | |
777 | eacr.e0 = 0; | |
778 | etr_port0_uptodate = 0; | |
779 | } | |
780 | if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) { | |
781 | if (eacr.e1) | |
782 | /* | |
783 | * Port change of an enabled port. We have to | |
784 | * assume that this can have caused an stepping | |
785 | * port switch. | |
786 | */ | |
787 | etr_tolec = get_clock(); | |
788 | eacr.p1 = etr_port1_online; | |
789 | if (!eacr.p1) | |
790 | eacr.e1 = 0; | |
791 | etr_port1_uptodate = 0; | |
792 | } | |
793 | clear_bit(ETR_EVENT_UPDATE, &etr_events); | |
794 | return eacr; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Set up a timer that expires after the etr_tolec + 1.6 seconds if | |
799 | * one of the ports needs an update. | |
800 | */ | |
801 | static void etr_set_tolec_timeout(unsigned long long now) | |
802 | { | |
803 | unsigned long micros; | |
804 | ||
805 | if ((!etr_eacr.p0 || etr_port0_uptodate) && | |
806 | (!etr_eacr.p1 || etr_port1_uptodate)) | |
807 | return; | |
808 | micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0; | |
809 | micros = (micros > 1600000) ? 0 : 1600000 - micros; | |
810 | mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1); | |
811 | } | |
812 | ||
813 | /* | |
814 | * Set up a time that expires after 1/2 second. | |
815 | */ | |
816 | static void etr_set_sync_timeout(void) | |
817 | { | |
818 | mod_timer(&etr_timer, jiffies + HZ/2); | |
819 | } | |
820 | ||
821 | /* | |
822 | * Update the aib information for one or both ports. | |
823 | */ | |
824 | static struct etr_eacr etr_handle_update(struct etr_aib *aib, | |
825 | struct etr_eacr eacr) | |
826 | { | |
827 | /* With both ports disabled the aib information is useless. */ | |
828 | if (!eacr.e0 && !eacr.e1) | |
829 | return eacr; | |
830 | ||
ecdcc023 | 831 | /* Update port0 or port1 with aib stored in etr_work_fn. */ |
d54853ef MS |
832 | if (aib->esw.q == 0) { |
833 | /* Information for port 0 stored. */ | |
834 | if (eacr.p0 && !etr_port0_uptodate) { | |
835 | etr_port0 = *aib; | |
836 | if (etr_port0_online) | |
837 | etr_port0_uptodate = 1; | |
838 | } | |
839 | } else { | |
840 | /* Information for port 1 stored. */ | |
841 | if (eacr.p1 && !etr_port1_uptodate) { | |
842 | etr_port1 = *aib; | |
843 | if (etr_port0_online) | |
844 | etr_port1_uptodate = 1; | |
845 | } | |
846 | } | |
847 | ||
848 | /* | |
849 | * Do not try to get the alternate port aib if the clock | |
850 | * is not in sync yet. | |
851 | */ | |
d2fec595 | 852 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags) && !eacr.es) |
d54853ef MS |
853 | return eacr; |
854 | ||
855 | /* | |
856 | * If steai is available we can get the information about | |
857 | * the other port immediately. If only stetr is available the | |
858 | * data-port bit toggle has to be used. | |
859 | */ | |
d2fec595 | 860 | if (etr_steai_available) { |
d54853ef MS |
861 | if (eacr.p0 && !etr_port0_uptodate) { |
862 | etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0); | |
863 | etr_port0_uptodate = 1; | |
864 | } | |
865 | if (eacr.p1 && !etr_port1_uptodate) { | |
866 | etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1); | |
867 | etr_port1_uptodate = 1; | |
868 | } | |
869 | } else { | |
870 | /* | |
871 | * One port was updated above, if the other | |
872 | * port is not uptodate toggle dp bit. | |
873 | */ | |
874 | if ((eacr.p0 && !etr_port0_uptodate) || | |
875 | (eacr.p1 && !etr_port1_uptodate)) | |
876 | eacr.dp ^= 1; | |
877 | else | |
878 | eacr.dp = 0; | |
879 | } | |
880 | return eacr; | |
881 | } | |
882 | ||
883 | /* | |
884 | * Write new etr control register if it differs from the current one. | |
885 | * Return 1 if etr_tolec has been updated as well. | |
886 | */ | |
887 | static void etr_update_eacr(struct etr_eacr eacr) | |
888 | { | |
889 | int dp_changed; | |
890 | ||
891 | if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0) | |
892 | /* No change, return. */ | |
893 | return; | |
894 | /* | |
895 | * The disable of an active port of the change of the data port | |
896 | * bit can/will cause a change in the data port. | |
897 | */ | |
898 | dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 || | |
899 | (etr_eacr.dp ^ eacr.dp) != 0; | |
900 | etr_eacr = eacr; | |
901 | etr_setr(&etr_eacr); | |
902 | if (dp_changed) | |
903 | etr_tolec = get_clock(); | |
904 | } | |
905 | ||
906 | /* | |
907 | * ETR tasklet. In this function you'll find the main logic. In | |
908 | * particular this is the only function that calls etr_update_eacr(), | |
909 | * it "controls" the etr control register. | |
910 | */ | |
ecdcc023 | 911 | static void etr_work_fn(struct work_struct *work) |
d54853ef MS |
912 | { |
913 | unsigned long long now; | |
914 | struct etr_eacr eacr; | |
915 | struct etr_aib aib; | |
916 | int sync_port; | |
917 | ||
918 | /* Create working copy of etr_eacr. */ | |
919 | eacr = etr_eacr; | |
920 | ||
921 | /* Check for the different events and their immediate effects. */ | |
922 | eacr = etr_handle_events(eacr); | |
923 | ||
924 | /* Check if ETR is supposed to be active. */ | |
925 | eacr.ea = eacr.p0 || eacr.p1; | |
926 | if (!eacr.ea) { | |
927 | /* Both ports offline. Reset everything. */ | |
928 | eacr.dp = eacr.es = eacr.sl = 0; | |
1a781a77 | 929 | on_each_cpu(disable_sync_clock, NULL, 1); |
d54853ef MS |
930 | del_timer_sync(&etr_timer); |
931 | etr_update_eacr(eacr); | |
d2fec595 | 932 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
d54853ef MS |
933 | return; |
934 | } | |
935 | ||
936 | /* Store aib to get the current ETR status word. */ | |
937 | BUG_ON(etr_stetr(&aib) != 0); | |
938 | etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */ | |
939 | now = get_clock(); | |
940 | ||
941 | /* | |
942 | * Update the port information if the last stepping port change | |
943 | * or data port change is older than 1.6 seconds. | |
944 | */ | |
945 | if (now >= etr_tolec + (1600000 << 12)) | |
946 | eacr = etr_handle_update(&aib, eacr); | |
947 | ||
948 | /* | |
949 | * Select ports to enable. The prefered synchronization mode is PPS. | |
950 | * If a port can be enabled depends on a number of things: | |
951 | * 1) The port needs to be online and uptodate. A port is not | |
952 | * disabled just because it is not uptodate, but it is only | |
953 | * enabled if it is uptodate. | |
954 | * 2) The port needs to have the same mode (pps / etr). | |
955 | * 3) The port needs to be usable -> etr_port_valid() == 1 | |
956 | * 4) To enable the second port the clock needs to be in sync. | |
957 | * 5) If both ports are useable and are ETR ports, the network id | |
958 | * has to be the same. | |
959 | * The eacr.sl bit is used to indicate etr mode vs. pps mode. | |
960 | */ | |
961 | if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) { | |
962 | eacr.sl = 0; | |
963 | eacr.e0 = 1; | |
964 | if (!etr_mode_is_pps(etr_eacr)) | |
965 | eacr.es = 0; | |
966 | if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode) | |
967 | eacr.e1 = 0; | |
968 | // FIXME: uptodate checks ? | |
969 | else if (etr_port0_uptodate && etr_port1_uptodate) | |
970 | eacr.e1 = 1; | |
971 | sync_port = (etr_port0_uptodate && | |
972 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; | |
d54853ef MS |
973 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) { |
974 | eacr.sl = 0; | |
975 | eacr.e0 = 0; | |
976 | eacr.e1 = 1; | |
977 | if (!etr_mode_is_pps(etr_eacr)) | |
978 | eacr.es = 0; | |
979 | sync_port = (etr_port1_uptodate && | |
980 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; | |
d54853ef MS |
981 | } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) { |
982 | eacr.sl = 1; | |
983 | eacr.e0 = 1; | |
984 | if (!etr_mode_is_etr(etr_eacr)) | |
985 | eacr.es = 0; | |
986 | if (!eacr.es || !eacr.p1 || | |
987 | aib.esw.psc1 != etr_lpsc_operational_alt) | |
988 | eacr.e1 = 0; | |
989 | else if (etr_port0_uptodate && etr_port1_uptodate && | |
990 | etr_compare_network(&etr_port0, &etr_port1)) | |
991 | eacr.e1 = 1; | |
992 | sync_port = (etr_port0_uptodate && | |
993 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; | |
d54853ef MS |
994 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) { |
995 | eacr.sl = 1; | |
996 | eacr.e0 = 0; | |
997 | eacr.e1 = 1; | |
998 | if (!etr_mode_is_etr(etr_eacr)) | |
999 | eacr.es = 0; | |
1000 | sync_port = (etr_port1_uptodate && | |
1001 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; | |
d54853ef MS |
1002 | } else { |
1003 | /* Both ports not usable. */ | |
1004 | eacr.es = eacr.sl = 0; | |
1005 | sync_port = -1; | |
d2fec595 | 1006 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
d54853ef MS |
1007 | } |
1008 | ||
d2fec595 MS |
1009 | if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
1010 | eacr.es = 0; | |
1011 | ||
d54853ef MS |
1012 | /* |
1013 | * If the clock is in sync just update the eacr and return. | |
1014 | * If there is no valid sync port wait for a port update. | |
1015 | */ | |
d2fec595 MS |
1016 | if (test_bit(CLOCK_SYNC_STP, &clock_sync_flags) || |
1017 | eacr.es || sync_port < 0) { | |
d54853ef MS |
1018 | etr_update_eacr(eacr); |
1019 | etr_set_tolec_timeout(now); | |
1020 | return; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Prepare control register for clock syncing | |
1025 | * (reset data port bit, set sync check control. | |
1026 | */ | |
1027 | eacr.dp = 0; | |
1028 | eacr.es = 1; | |
1029 | ||
1030 | /* | |
1031 | * Update eacr and try to synchronize the clock. If the update | |
1032 | * of eacr caused a stepping port switch (or if we have to | |
1033 | * assume that a stepping port switch has occured) or the | |
1034 | * clock syncing failed, reset the sync check control bit | |
1035 | * and set up a timer to try again after 0.5 seconds | |
1036 | */ | |
1037 | etr_update_eacr(eacr); | |
d2fec595 | 1038 | set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
d54853ef MS |
1039 | if (now < etr_tolec + (1600000 << 12) || |
1040 | etr_sync_clock(&aib, sync_port) != 0) { | |
1041 | /* Sync failed. Try again in 1/2 second. */ | |
1042 | eacr.es = 0; | |
1043 | etr_update_eacr(eacr); | |
d2fec595 | 1044 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
d54853ef MS |
1045 | etr_set_sync_timeout(); |
1046 | } else | |
1047 | etr_set_tolec_timeout(now); | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Sysfs interface functions | |
1052 | */ | |
1053 | static struct sysdev_class etr_sysclass = { | |
af5ca3f4 | 1054 | .name = "etr", |
d54853ef MS |
1055 | }; |
1056 | ||
1057 | static struct sys_device etr_port0_dev = { | |
1058 | .id = 0, | |
1059 | .cls = &etr_sysclass, | |
1060 | }; | |
1061 | ||
1062 | static struct sys_device etr_port1_dev = { | |
1063 | .id = 1, | |
1064 | .cls = &etr_sysclass, | |
1065 | }; | |
1066 | ||
1067 | /* | |
1068 | * ETR class attributes | |
1069 | */ | |
1070 | static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf) | |
1071 | { | |
1072 | return sprintf(buf, "%i\n", etr_port0.esw.p); | |
1073 | } | |
1074 | ||
1075 | static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL); | |
1076 | ||
1077 | static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf) | |
1078 | { | |
1079 | char *mode_str; | |
1080 | ||
1081 | if (etr_mode_is_pps(etr_eacr)) | |
1082 | mode_str = "pps"; | |
1083 | else if (etr_mode_is_etr(etr_eacr)) | |
1084 | mode_str = "etr"; | |
1085 | else | |
1086 | mode_str = "local"; | |
1087 | return sprintf(buf, "%s\n", mode_str); | |
1088 | } | |
1089 | ||
1090 | static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL); | |
1091 | ||
1092 | /* | |
1093 | * ETR port attributes | |
1094 | */ | |
1095 | static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev) | |
1096 | { | |
1097 | if (dev == &etr_port0_dev) | |
1098 | return etr_port0_online ? &etr_port0 : NULL; | |
1099 | else | |
1100 | return etr_port1_online ? &etr_port1 : NULL; | |
1101 | } | |
1102 | ||
1103 | static ssize_t etr_online_show(struct sys_device *dev, char *buf) | |
1104 | { | |
1105 | unsigned int online; | |
1106 | ||
1107 | online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online; | |
1108 | return sprintf(buf, "%i\n", online); | |
1109 | } | |
1110 | ||
1111 | static ssize_t etr_online_store(struct sys_device *dev, | |
1112 | const char *buf, size_t count) | |
1113 | { | |
1114 | unsigned int value; | |
1115 | ||
1116 | value = simple_strtoul(buf, NULL, 0); | |
1117 | if (value != 0 && value != 1) | |
1118 | return -EINVAL; | |
d2fec595 MS |
1119 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
1120 | return -EOPNOTSUPP; | |
d54853ef MS |
1121 | if (dev == &etr_port0_dev) { |
1122 | if (etr_port0_online == value) | |
1123 | return count; /* Nothing to do. */ | |
1124 | etr_port0_online = value; | |
1125 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); | |
ecdcc023 | 1126 | schedule_work(&etr_work); |
d54853ef MS |
1127 | } else { |
1128 | if (etr_port1_online == value) | |
1129 | return count; /* Nothing to do. */ | |
1130 | etr_port1_online = value; | |
1131 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); | |
ecdcc023 | 1132 | schedule_work(&etr_work); |
d54853ef MS |
1133 | } |
1134 | return count; | |
1135 | } | |
1136 | ||
1137 | static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store); | |
1138 | ||
1139 | static ssize_t etr_stepping_control_show(struct sys_device *dev, char *buf) | |
1140 | { | |
1141 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? | |
1142 | etr_eacr.e0 : etr_eacr.e1); | |
1143 | } | |
1144 | ||
1145 | static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL); | |
1146 | ||
1147 | static ssize_t etr_mode_code_show(struct sys_device *dev, char *buf) | |
1148 | { | |
1149 | if (!etr_port0_online && !etr_port1_online) | |
1150 | /* Status word is not uptodate if both ports are offline. */ | |
1151 | return -ENODATA; | |
1152 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? | |
1153 | etr_port0.esw.psc0 : etr_port0.esw.psc1); | |
1154 | } | |
1155 | ||
1156 | static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL); | |
1157 | ||
1158 | static ssize_t etr_untuned_show(struct sys_device *dev, char *buf) | |
1159 | { | |
1160 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1161 | ||
1162 | if (!aib || !aib->slsw.v1) | |
1163 | return -ENODATA; | |
1164 | return sprintf(buf, "%i\n", aib->edf1.u); | |
1165 | } | |
1166 | ||
1167 | static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL); | |
1168 | ||
1169 | static ssize_t etr_network_id_show(struct sys_device *dev, char *buf) | |
1170 | { | |
1171 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1172 | ||
1173 | if (!aib || !aib->slsw.v1) | |
1174 | return -ENODATA; | |
1175 | return sprintf(buf, "%i\n", aib->edf1.net_id); | |
1176 | } | |
1177 | ||
1178 | static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL); | |
1179 | ||
1180 | static ssize_t etr_id_show(struct sys_device *dev, char *buf) | |
1181 | { | |
1182 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1183 | ||
1184 | if (!aib || !aib->slsw.v1) | |
1185 | return -ENODATA; | |
1186 | return sprintf(buf, "%i\n", aib->edf1.etr_id); | |
1187 | } | |
1188 | ||
1189 | static SYSDEV_ATTR(id, 0400, etr_id_show, NULL); | |
1190 | ||
1191 | static ssize_t etr_port_number_show(struct sys_device *dev, char *buf) | |
1192 | { | |
1193 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1194 | ||
1195 | if (!aib || !aib->slsw.v1) | |
1196 | return -ENODATA; | |
1197 | return sprintf(buf, "%i\n", aib->edf1.etr_pn); | |
1198 | } | |
1199 | ||
1200 | static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL); | |
1201 | ||
1202 | static ssize_t etr_coupled_show(struct sys_device *dev, char *buf) | |
1203 | { | |
1204 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1205 | ||
1206 | if (!aib || !aib->slsw.v3) | |
1207 | return -ENODATA; | |
1208 | return sprintf(buf, "%i\n", aib->edf3.c); | |
1209 | } | |
1210 | ||
1211 | static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL); | |
1212 | ||
1213 | static ssize_t etr_local_time_show(struct sys_device *dev, char *buf) | |
1214 | { | |
1215 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1216 | ||
1217 | if (!aib || !aib->slsw.v3) | |
1218 | return -ENODATA; | |
1219 | return sprintf(buf, "%i\n", aib->edf3.blto); | |
1220 | } | |
1221 | ||
1222 | static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL); | |
1223 | ||
1224 | static ssize_t etr_utc_offset_show(struct sys_device *dev, char *buf) | |
1225 | { | |
1226 | struct etr_aib *aib = etr_aib_from_dev(dev); | |
1227 | ||
1228 | if (!aib || !aib->slsw.v3) | |
1229 | return -ENODATA; | |
1230 | return sprintf(buf, "%i\n", aib->edf3.buo); | |
1231 | } | |
1232 | ||
1233 | static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL); | |
1234 | ||
1235 | static struct sysdev_attribute *etr_port_attributes[] = { | |
1236 | &attr_online, | |
1237 | &attr_stepping_control, | |
1238 | &attr_state_code, | |
1239 | &attr_untuned, | |
1240 | &attr_network, | |
1241 | &attr_id, | |
1242 | &attr_port, | |
1243 | &attr_coupled, | |
1244 | &attr_local_time, | |
1245 | &attr_utc_offset, | |
1246 | NULL | |
1247 | }; | |
1248 | ||
1249 | static int __init etr_register_port(struct sys_device *dev) | |
1250 | { | |
1251 | struct sysdev_attribute **attr; | |
1252 | int rc; | |
1253 | ||
1254 | rc = sysdev_register(dev); | |
1255 | if (rc) | |
1256 | goto out; | |
1257 | for (attr = etr_port_attributes; *attr; attr++) { | |
1258 | rc = sysdev_create_file(dev, *attr); | |
1259 | if (rc) | |
1260 | goto out_unreg; | |
1261 | } | |
1262 | return 0; | |
1263 | out_unreg: | |
1264 | for (; attr >= etr_port_attributes; attr--) | |
1265 | sysdev_remove_file(dev, *attr); | |
1266 | sysdev_unregister(dev); | |
1267 | out: | |
1268 | return rc; | |
1269 | } | |
1270 | ||
1271 | static void __init etr_unregister_port(struct sys_device *dev) | |
1272 | { | |
1273 | struct sysdev_attribute **attr; | |
1274 | ||
1275 | for (attr = etr_port_attributes; *attr; attr++) | |
1276 | sysdev_remove_file(dev, *attr); | |
1277 | sysdev_unregister(dev); | |
1278 | } | |
1279 | ||
1280 | static int __init etr_init_sysfs(void) | |
1281 | { | |
1282 | int rc; | |
1283 | ||
1284 | rc = sysdev_class_register(&etr_sysclass); | |
1285 | if (rc) | |
1286 | goto out; | |
1287 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port); | |
1288 | if (rc) | |
1289 | goto out_unreg_class; | |
1290 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode); | |
1291 | if (rc) | |
1292 | goto out_remove_stepping_port; | |
1293 | rc = etr_register_port(&etr_port0_dev); | |
1294 | if (rc) | |
1295 | goto out_remove_stepping_mode; | |
1296 | rc = etr_register_port(&etr_port1_dev); | |
1297 | if (rc) | |
1298 | goto out_remove_port0; | |
1299 | return 0; | |
1300 | ||
1301 | out_remove_port0: | |
1302 | etr_unregister_port(&etr_port0_dev); | |
1303 | out_remove_stepping_mode: | |
1304 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode); | |
1305 | out_remove_stepping_port: | |
1306 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port); | |
1307 | out_unreg_class: | |
1308 | sysdev_class_unregister(&etr_sysclass); | |
1309 | out: | |
1310 | return rc; | |
1da177e4 LT |
1311 | } |
1312 | ||
d54853ef | 1313 | device_initcall(etr_init_sysfs); |
d2fec595 MS |
1314 | |
1315 | /* | |
1316 | * Server Time Protocol (STP) code. | |
1317 | */ | |
1318 | static int stp_online; | |
1319 | static struct stp_sstpi stp_info; | |
1320 | static void *stp_page; | |
1321 | ||
1322 | static void stp_work_fn(struct work_struct *work); | |
1323 | static DECLARE_WORK(stp_work, stp_work_fn); | |
1324 | ||
1325 | static int __init early_parse_stp(char *p) | |
1326 | { | |
1327 | if (strncmp(p, "off", 3) == 0) | |
1328 | stp_online = 0; | |
1329 | else if (strncmp(p, "on", 2) == 0) | |
1330 | stp_online = 1; | |
1331 | return 0; | |
1332 | } | |
1333 | early_param("stp", early_parse_stp); | |
1334 | ||
1335 | /* | |
1336 | * Reset STP attachment. | |
1337 | */ | |
1338 | static void stp_reset(void) | |
1339 | { | |
1340 | int rc; | |
1341 | ||
1342 | stp_page = alloc_bootmem_pages(PAGE_SIZE); | |
1343 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); | |
1344 | if (rc == 1) | |
1345 | set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags); | |
1346 | else if (stp_online) { | |
1347 | printk(KERN_WARNING "Running on non STP capable machine.\n"); | |
1348 | free_bootmem((unsigned long) stp_page, PAGE_SIZE); | |
1349 | stp_page = NULL; | |
1350 | stp_online = 0; | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | static int __init stp_init(void) | |
1355 | { | |
1356 | if (test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags) && stp_online) | |
1357 | schedule_work(&stp_work); | |
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | arch_initcall(stp_init); | |
1362 | ||
1363 | /* | |
1364 | * STP timing alert. There are three causes: | |
1365 | * 1) timing status change | |
1366 | * 2) link availability change | |
1367 | * 3) time control parameter change | |
1368 | * In all three cases we are only interested in the clock source state. | |
1369 | * If a STP clock source is now available use it. | |
1370 | */ | |
1371 | static void stp_timing_alert(struct stp_irq_parm *intparm) | |
1372 | { | |
1373 | if (intparm->tsc || intparm->lac || intparm->tcpc) | |
1374 | schedule_work(&stp_work); | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * STP sync check machine check. This is called when the timing state | |
1379 | * changes from the synchronized state to the unsynchronized state. | |
1380 | * After a STP sync check the clock is not in sync. The machine check | |
1381 | * is broadcasted to all cpus at the same time. | |
1382 | */ | |
1383 | void stp_sync_check(void) | |
1384 | { | |
1385 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) | |
1386 | return; | |
1387 | disable_sync_clock(NULL); | |
1388 | schedule_work(&stp_work); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * STP island condition machine check. This is called when an attached | |
1393 | * server attempts to communicate over an STP link and the servers | |
1394 | * have matching CTN ids and have a valid stratum-1 configuration | |
1395 | * but the configurations do not match. | |
1396 | */ | |
1397 | void stp_island_check(void) | |
1398 | { | |
1399 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) | |
1400 | return; | |
1401 | disable_sync_clock(NULL); | |
1402 | schedule_work(&stp_work); | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * STP tasklet. Check for the STP state and take over the clock | |
1407 | * synchronization if the STP clock source is usable. | |
1408 | */ | |
1409 | static void stp_work_fn(struct work_struct *work) | |
1410 | { | |
1411 | struct clock_sync_data stp_sync; | |
1412 | unsigned long long old_clock, delta; | |
1413 | int rc; | |
1414 | ||
1415 | if (!stp_online) { | |
1416 | chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); | |
1417 | return; | |
1418 | } | |
1419 | ||
1420 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0); | |
1421 | if (rc) | |
1422 | return; | |
1423 | ||
1424 | rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi)); | |
1425 | if (rc || stp_info.c == 0) | |
1426 | return; | |
1427 | ||
1428 | /* | |
1429 | * Catch all other cpus and make them wait until we have | |
1430 | * successfully synced the clock. smp_call_function will | |
1431 | * return after all other cpus are in clock_sync_cpu_start. | |
1432 | */ | |
1433 | memset(&stp_sync, 0, sizeof(stp_sync)); | |
1434 | preempt_disable(); | |
f6f88e9b | 1435 | smp_call_function(clock_sync_cpu_start, &stp_sync, 0); |
d2fec595 MS |
1436 | local_irq_disable(); |
1437 | enable_sync_clock(); | |
1438 | ||
1439 | set_bit(CLOCK_SYNC_STP, &clock_sync_flags); | |
1440 | if (test_and_clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) | |
1441 | schedule_work(&etr_work); | |
1442 | ||
1443 | rc = 0; | |
1444 | if (stp_info.todoff[0] || stp_info.todoff[1] || | |
1445 | stp_info.todoff[2] || stp_info.todoff[3] || | |
1446 | stp_info.tmd != 2) { | |
1447 | old_clock = get_clock(); | |
1448 | rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0); | |
1449 | if (rc == 0) { | |
1450 | delta = adjust_time(old_clock, get_clock(), 0); | |
1451 | fixup_clock_comparator(delta); | |
1452 | rc = chsc_sstpi(stp_page, &stp_info, | |
1453 | sizeof(struct stp_sstpi)); | |
1454 | if (rc == 0 && stp_info.tmd != 2) | |
1455 | rc = -EAGAIN; | |
1456 | } | |
1457 | } | |
1458 | if (rc) { | |
1459 | disable_sync_clock(NULL); | |
1460 | stp_sync.in_sync = -EAGAIN; | |
1461 | clear_bit(CLOCK_SYNC_STP, &clock_sync_flags); | |
1462 | if (etr_port0_online || etr_port1_online) | |
1463 | schedule_work(&etr_work); | |
1464 | } else | |
1465 | stp_sync.in_sync = 1; | |
1466 | ||
1467 | local_irq_enable(); | |
f6f88e9b | 1468 | smp_call_function(clock_sync_cpu_end, NULL, 0); |
d2fec595 MS |
1469 | preempt_enable(); |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * STP class sysfs interface functions | |
1474 | */ | |
1475 | static struct sysdev_class stp_sysclass = { | |
1476 | .name = "stp", | |
1477 | }; | |
1478 | ||
1479 | static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf) | |
1480 | { | |
1481 | if (!stp_online) | |
1482 | return -ENODATA; | |
1483 | return sprintf(buf, "%016llx\n", | |
1484 | *(unsigned long long *) stp_info.ctnid); | |
1485 | } | |
1486 | ||
1487 | static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL); | |
1488 | ||
1489 | static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf) | |
1490 | { | |
1491 | if (!stp_online) | |
1492 | return -ENODATA; | |
1493 | return sprintf(buf, "%i\n", stp_info.ctn); | |
1494 | } | |
1495 | ||
1496 | static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL); | |
1497 | ||
1498 | static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf) | |
1499 | { | |
1500 | if (!stp_online || !(stp_info.vbits & 0x2000)) | |
1501 | return -ENODATA; | |
1502 | return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto); | |
1503 | } | |
1504 | ||
1505 | static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL); | |
1506 | ||
1507 | static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf) | |
1508 | { | |
1509 | if (!stp_online || !(stp_info.vbits & 0x8000)) | |
1510 | return -ENODATA; | |
1511 | return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps); | |
1512 | } | |
1513 | ||
1514 | static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL); | |
1515 | ||
1516 | static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf) | |
1517 | { | |
1518 | if (!stp_online) | |
1519 | return -ENODATA; | |
1520 | return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum); | |
1521 | } | |
1522 | ||
1523 | static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL); | |
1524 | ||
1525 | static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf) | |
1526 | { | |
1527 | if (!stp_online || !(stp_info.vbits & 0x0800)) | |
1528 | return -ENODATA; | |
1529 | return sprintf(buf, "%i\n", (int) stp_info.tto); | |
1530 | } | |
1531 | ||
1532 | static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL); | |
1533 | ||
1534 | static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, char *buf) | |
1535 | { | |
1536 | if (!stp_online || !(stp_info.vbits & 0x4000)) | |
1537 | return -ENODATA; | |
1538 | return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo); | |
1539 | } | |
1540 | ||
1541 | static SYSDEV_CLASS_ATTR(time_zone_offset, 0400, | |
1542 | stp_time_zone_offset_show, NULL); | |
1543 | ||
1544 | static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf) | |
1545 | { | |
1546 | if (!stp_online) | |
1547 | return -ENODATA; | |
1548 | return sprintf(buf, "%i\n", stp_info.tmd); | |
1549 | } | |
1550 | ||
1551 | static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL); | |
1552 | ||
1553 | static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf) | |
1554 | { | |
1555 | if (!stp_online) | |
1556 | return -ENODATA; | |
1557 | return sprintf(buf, "%i\n", stp_info.tst); | |
1558 | } | |
1559 | ||
1560 | static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL); | |
1561 | ||
1562 | static ssize_t stp_online_show(struct sysdev_class *class, char *buf) | |
1563 | { | |
1564 | return sprintf(buf, "%i\n", stp_online); | |
1565 | } | |
1566 | ||
1567 | static ssize_t stp_online_store(struct sysdev_class *class, | |
1568 | const char *buf, size_t count) | |
1569 | { | |
1570 | unsigned int value; | |
1571 | ||
1572 | value = simple_strtoul(buf, NULL, 0); | |
1573 | if (value != 0 && value != 1) | |
1574 | return -EINVAL; | |
1575 | if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) | |
1576 | return -EOPNOTSUPP; | |
1577 | stp_online = value; | |
1578 | schedule_work(&stp_work); | |
1579 | return count; | |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * Can't use SYSDEV_CLASS_ATTR because the attribute should be named | |
1584 | * stp/online but attr_online already exists in this file .. | |
1585 | */ | |
1586 | static struct sysdev_class_attribute attr_stp_online = { | |
1587 | .attr = { .name = "online", .mode = 0600 }, | |
1588 | .show = stp_online_show, | |
1589 | .store = stp_online_store, | |
1590 | }; | |
1591 | ||
1592 | static struct sysdev_class_attribute *stp_attributes[] = { | |
1593 | &attr_ctn_id, | |
1594 | &attr_ctn_type, | |
1595 | &attr_dst_offset, | |
1596 | &attr_leap_seconds, | |
1597 | &attr_stp_online, | |
1598 | &attr_stratum, | |
1599 | &attr_time_offset, | |
1600 | &attr_time_zone_offset, | |
1601 | &attr_timing_mode, | |
1602 | &attr_timing_state, | |
1603 | NULL | |
1604 | }; | |
1605 | ||
1606 | static int __init stp_init_sysfs(void) | |
1607 | { | |
1608 | struct sysdev_class_attribute **attr; | |
1609 | int rc; | |
1610 | ||
1611 | rc = sysdev_class_register(&stp_sysclass); | |
1612 | if (rc) | |
1613 | goto out; | |
1614 | for (attr = stp_attributes; *attr; attr++) { | |
1615 | rc = sysdev_class_create_file(&stp_sysclass, *attr); | |
1616 | if (rc) | |
1617 | goto out_unreg; | |
1618 | } | |
1619 | return 0; | |
1620 | out_unreg: | |
1621 | for (; attr >= stp_attributes; attr--) | |
1622 | sysdev_class_remove_file(&stp_sysclass, *attr); | |
1623 | sysdev_class_unregister(&stp_sysclass); | |
1624 | out: | |
1625 | return rc; | |
1626 | } | |
1627 | ||
1628 | device_initcall(stp_init_sysfs); |