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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PTP 1588 clock support
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 */
7#include <linux/device.h>
8#include <linux/err.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/posix-clock.h>
13#include <linux/pps_kernel.h>
14#include <linux/slab.h>
15#include <linux/syscalls.h>
16#include <linux/uaccess.h>
17#include <linux/debugfs.h>
18#include <linux/xarray.h>
19#include <uapi/linux/sched/types.h>
20
21#include "ptp_private.h"
22
23#define PTP_MAX_ALARMS 4
24#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT)
25#define PTP_PPS_EVENT PPS_CAPTUREASSERT
26#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
27
28const struct class ptp_class = {
29 .name = "ptp",
30 .dev_groups = ptp_groups
31};
32
33/* private globals */
34
35static dev_t ptp_devt;
36
37static DEFINE_XARRAY_ALLOC(ptp_clocks_map);
38
39/* time stamp event queue operations */
40
41static inline int queue_free(struct timestamp_event_queue *q)
42{
43 return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
44}
45
46static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
47 struct ptp_clock_event *src)
48{
49 struct ptp_extts_event *dst;
50 struct timespec64 offset_ts;
51 unsigned long flags;
52 s64 seconds;
53 u32 remainder;
54
55 if (src->type == PTP_CLOCK_EXTTS) {
56 seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
57 } else if (src->type == PTP_CLOCK_EXTOFF) {
58 offset_ts = ns_to_timespec64(src->offset);
59 seconds = offset_ts.tv_sec;
60 remainder = offset_ts.tv_nsec;
61 } else {
62 WARN(1, "%s: unknown type %d\n", __func__, src->type);
63 return;
64 }
65
66 spin_lock_irqsave(&queue->lock, flags);
67
68 dst = &queue->buf[queue->tail];
69 dst->index = src->index;
70 dst->flags = PTP_EXTTS_EVENT_VALID;
71 dst->t.sec = seconds;
72 dst->t.nsec = remainder;
73 if (src->type == PTP_CLOCK_EXTOFF)
74 dst->flags |= PTP_EXT_OFFSET;
75
76 /* Both WRITE_ONCE() are paired with READ_ONCE() in queue_cnt() */
77 if (!queue_free(queue))
78 WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
79
80 WRITE_ONCE(queue->tail, (queue->tail + 1) % PTP_MAX_TIMESTAMPS);
81
82 spin_unlock_irqrestore(&queue->lock, flags);
83}
84
85/* posix clock implementation */
86
87static int ptp_clock_getres(struct posix_clock *pc, struct timespec64 *tp)
88{
89 tp->tv_sec = 0;
90 tp->tv_nsec = 1;
91 return 0;
92}
93
94static int ptp_clock_settime(struct posix_clock *pc, const struct timespec64 *tp)
95{
96 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
97
98 if (ptp_clock_freerun(ptp)) {
99 pr_err("ptp: physical clock is free running\n");
100 return -EBUSY;
101 }
102
103 return ptp->info->settime64(ptp->info, tp);
104}
105
106static int ptp_clock_gettime(struct posix_clock *pc, struct timespec64 *tp)
107{
108 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
109 int err;
110
111 if (ptp->info->gettimex64)
112 err = ptp->info->gettimex64(ptp->info, tp, NULL);
113 else
114 err = ptp->info->gettime64(ptp->info, tp);
115 return err;
116}
117
118static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
119{
120 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
121 struct ptp_clock_info *ops;
122 int err = -EOPNOTSUPP;
123
124 if (ptp_clock_freerun(ptp)) {
125 pr_err("ptp: physical clock is free running\n");
126 return -EBUSY;
127 }
128
129 ops = ptp->info;
130
131 if (tx->modes & ADJ_SETOFFSET) {
132 struct timespec64 ts;
133 ktime_t kt;
134 s64 delta;
135
136 ts.tv_sec = tx->time.tv_sec;
137 ts.tv_nsec = tx->time.tv_usec;
138
139 if (!(tx->modes & ADJ_NANO))
140 ts.tv_nsec *= 1000;
141
142 if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
143 return -EINVAL;
144
145 kt = timespec64_to_ktime(ts);
146 delta = ktime_to_ns(kt);
147 err = ops->adjtime(ops, delta);
148 } else if (tx->modes & ADJ_FREQUENCY) {
149 long ppb = scaled_ppm_to_ppb(tx->freq);
150 if (ppb > ops->max_adj || ppb < -ops->max_adj)
151 return -ERANGE;
152 err = ops->adjfine(ops, tx->freq);
153 if (!err)
154 ptp->dialed_frequency = tx->freq;
155 } else if (tx->modes & ADJ_OFFSET) {
156 if (ops->adjphase) {
157 s32 max_phase_adj = ops->getmaxphase(ops);
158 s32 offset = tx->offset;
159
160 if (!(tx->modes & ADJ_NANO))
161 offset *= NSEC_PER_USEC;
162
163 if (offset > max_phase_adj || offset < -max_phase_adj)
164 return -ERANGE;
165
166 err = ops->adjphase(ops, offset);
167 }
168 } else if (tx->modes == 0) {
169 tx->freq = ptp->dialed_frequency;
170 err = 0;
171 }
172
173 return err;
174}
175
176static struct posix_clock_operations ptp_clock_ops = {
177 .owner = THIS_MODULE,
178 .clock_adjtime = ptp_clock_adjtime,
179 .clock_gettime = ptp_clock_gettime,
180 .clock_getres = ptp_clock_getres,
181 .clock_settime = ptp_clock_settime,
182 .ioctl = ptp_ioctl,
183 .open = ptp_open,
184 .release = ptp_release,
185 .poll = ptp_poll,
186 .read = ptp_read,
187};
188
189static void ptp_clock_release(struct device *dev)
190{
191 struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
192 struct timestamp_event_queue *tsevq;
193 unsigned long flags;
194
195 ptp_cleanup_pin_groups(ptp);
196 kfree(ptp->vclock_index);
197 mutex_destroy(&ptp->pincfg_mux);
198 mutex_destroy(&ptp->n_vclocks_mux);
199 /* Delete first entry */
200 spin_lock_irqsave(&ptp->tsevqs_lock, flags);
201 tsevq = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
202 qlist);
203 list_del(&tsevq->qlist);
204 spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
205 bitmap_free(tsevq->mask);
206 kfree(tsevq);
207 debugfs_remove(ptp->debugfs_root);
208 xa_erase(&ptp_clocks_map, ptp->index);
209 kfree(ptp);
210}
211
212static int ptp_getcycles64(struct ptp_clock_info *info, struct timespec64 *ts)
213{
214 if (info->getcyclesx64)
215 return info->getcyclesx64(info, ts, NULL);
216 else
217 return info->gettime64(info, ts);
218}
219
220static int ptp_enable(struct ptp_clock_info *ptp, struct ptp_clock_request *request, int on)
221{
222 return -EOPNOTSUPP;
223}
224
225static void ptp_aux_kworker(struct kthread_work *work)
226{
227 struct ptp_clock *ptp = container_of(work, struct ptp_clock,
228 aux_work.work);
229 struct ptp_clock_info *info = ptp->info;
230 long delay;
231
232 delay = info->do_aux_work(info);
233
234 if (delay >= 0)
235 kthread_queue_delayed_work(ptp->kworker, &ptp->aux_work, delay);
236}
237
238/* public interface */
239
240struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
241 struct device *parent)
242{
243 struct ptp_clock *ptp;
244 struct timestamp_event_queue *queue = NULL;
245 int err, index, major = MAJOR(ptp_devt);
246 char debugfsname[16];
247 size_t size;
248
249 if (info->n_alarm > PTP_MAX_ALARMS)
250 return ERR_PTR(-EINVAL);
251
252 /* Initialize a clock structure. */
253 ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
254 if (!ptp) {
255 err = -ENOMEM;
256 goto no_memory;
257 }
258
259 err = xa_alloc(&ptp_clocks_map, &index, ptp, xa_limit_31b,
260 GFP_KERNEL);
261 if (err)
262 goto no_slot;
263
264 ptp->clock.ops = ptp_clock_ops;
265 ptp->info = info;
266 ptp->devid = MKDEV(major, index);
267 ptp->index = index;
268 INIT_LIST_HEAD(&ptp->tsevqs);
269 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
270 if (!queue) {
271 err = -ENOMEM;
272 goto no_memory_queue;
273 }
274 list_add_tail(&queue->qlist, &ptp->tsevqs);
275 spin_lock_init(&ptp->tsevqs_lock);
276 queue->mask = bitmap_alloc(PTP_MAX_CHANNELS, GFP_KERNEL);
277 if (!queue->mask) {
278 err = -ENOMEM;
279 goto no_memory_bitmap;
280 }
281 bitmap_set(queue->mask, 0, PTP_MAX_CHANNELS);
282 spin_lock_init(&queue->lock);
283 mutex_init(&ptp->pincfg_mux);
284 mutex_init(&ptp->n_vclocks_mux);
285 init_waitqueue_head(&ptp->tsev_wq);
286
287 if (ptp->info->getcycles64 || ptp->info->getcyclesx64) {
288 ptp->has_cycles = true;
289 if (!ptp->info->getcycles64 && ptp->info->getcyclesx64)
290 ptp->info->getcycles64 = ptp_getcycles64;
291 } else {
292 /* Free running cycle counter not supported, use time. */
293 ptp->info->getcycles64 = ptp_getcycles64;
294
295 if (ptp->info->gettimex64)
296 ptp->info->getcyclesx64 = ptp->info->gettimex64;
297
298 if (ptp->info->getcrosststamp)
299 ptp->info->getcrosscycles = ptp->info->getcrosststamp;
300 }
301
302 if (!ptp->info->enable)
303 ptp->info->enable = ptp_enable;
304
305 if (ptp->info->do_aux_work) {
306 kthread_init_delayed_work(&ptp->aux_work, ptp_aux_kworker);
307 ptp->kworker = kthread_create_worker(0, "ptp%d", ptp->index);
308 if (IS_ERR(ptp->kworker)) {
309 err = PTR_ERR(ptp->kworker);
310 pr_err("failed to create ptp aux_worker %d\n", err);
311 goto kworker_err;
312 }
313 }
314
315 /* PTP virtual clock is being registered under physical clock */
316 if (parent && parent->class && parent->class->name &&
317 strcmp(parent->class->name, "ptp") == 0)
318 ptp->is_virtual_clock = true;
319
320 if (!ptp->is_virtual_clock) {
321 ptp->max_vclocks = PTP_DEFAULT_MAX_VCLOCKS;
322
323 size = sizeof(int) * ptp->max_vclocks;
324 ptp->vclock_index = kzalloc(size, GFP_KERNEL);
325 if (!ptp->vclock_index) {
326 err = -ENOMEM;
327 goto no_mem_for_vclocks;
328 }
329 }
330
331 err = ptp_populate_pin_groups(ptp);
332 if (err)
333 goto no_pin_groups;
334
335 /* Register a new PPS source. */
336 if (info->pps) {
337 struct pps_source_info pps;
338 memset(&pps, 0, sizeof(pps));
339 snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
340 pps.mode = PTP_PPS_MODE;
341 pps.owner = info->owner;
342 ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
343 if (IS_ERR(ptp->pps_source)) {
344 err = PTR_ERR(ptp->pps_source);
345 pr_err("failed to register pps source\n");
346 goto no_pps;
347 }
348 ptp->pps_source->lookup_cookie = ptp;
349 }
350
351 /* Initialize a new device of our class in our clock structure. */
352 device_initialize(&ptp->dev);
353 ptp->dev.devt = ptp->devid;
354 ptp->dev.class = &ptp_class;
355 ptp->dev.parent = parent;
356 ptp->dev.groups = ptp->pin_attr_groups;
357 ptp->dev.release = ptp_clock_release;
358 dev_set_drvdata(&ptp->dev, ptp);
359 dev_set_name(&ptp->dev, "ptp%d", ptp->index);
360
361 /* Create a posix clock and link it to the device. */
362 err = posix_clock_register(&ptp->clock, &ptp->dev);
363 if (err) {
364 if (ptp->pps_source)
365 pps_unregister_source(ptp->pps_source);
366
367 if (ptp->kworker)
368 kthread_destroy_worker(ptp->kworker);
369
370 put_device(&ptp->dev);
371
372 pr_err("failed to create posix clock\n");
373 return ERR_PTR(err);
374 }
375
376 /* Debugfs initialization */
377 snprintf(debugfsname, sizeof(debugfsname), "ptp%d", ptp->index);
378 ptp->debugfs_root = debugfs_create_dir(debugfsname, NULL);
379
380 return ptp;
381
382no_pps:
383 ptp_cleanup_pin_groups(ptp);
384no_pin_groups:
385 kfree(ptp->vclock_index);
386no_mem_for_vclocks:
387 if (ptp->kworker)
388 kthread_destroy_worker(ptp->kworker);
389kworker_err:
390 mutex_destroy(&ptp->pincfg_mux);
391 mutex_destroy(&ptp->n_vclocks_mux);
392 bitmap_free(queue->mask);
393no_memory_bitmap:
394 list_del(&queue->qlist);
395 kfree(queue);
396no_memory_queue:
397 xa_erase(&ptp_clocks_map, index);
398no_slot:
399 kfree(ptp);
400no_memory:
401 return ERR_PTR(err);
402}
403EXPORT_SYMBOL(ptp_clock_register);
404
405static int unregister_vclock(struct device *dev, void *data)
406{
407 struct ptp_clock *ptp = dev_get_drvdata(dev);
408
409 ptp_vclock_unregister(info_to_vclock(ptp->info));
410 return 0;
411}
412
413int ptp_clock_unregister(struct ptp_clock *ptp)
414{
415 if (ptp_vclock_in_use(ptp)) {
416 device_for_each_child(&ptp->dev, NULL, unregister_vclock);
417 }
418
419 ptp->defunct = 1;
420 wake_up_interruptible(&ptp->tsev_wq);
421
422 if (ptp->kworker) {
423 kthread_cancel_delayed_work_sync(&ptp->aux_work);
424 kthread_destroy_worker(ptp->kworker);
425 }
426
427 /* Release the clock's resources. */
428 if (ptp->pps_source)
429 pps_unregister_source(ptp->pps_source);
430
431 posix_clock_unregister(&ptp->clock);
432
433 return 0;
434}
435EXPORT_SYMBOL(ptp_clock_unregister);
436
437void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
438{
439 struct timestamp_event_queue *tsevq;
440 struct pps_event_time evt;
441 unsigned long flags;
442
443 switch (event->type) {
444
445 case PTP_CLOCK_ALARM:
446 break;
447
448 case PTP_CLOCK_EXTTS:
449 case PTP_CLOCK_EXTOFF:
450 /* Enqueue timestamp on selected queues */
451 spin_lock_irqsave(&ptp->tsevqs_lock, flags);
452 list_for_each_entry(tsevq, &ptp->tsevqs, qlist) {
453 if (test_bit((unsigned int)event->index, tsevq->mask))
454 enqueue_external_timestamp(tsevq, event);
455 }
456 spin_unlock_irqrestore(&ptp->tsevqs_lock, flags);
457 wake_up_interruptible(&ptp->tsev_wq);
458 break;
459
460 case PTP_CLOCK_PPS:
461 pps_get_ts(&evt);
462 pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
463 break;
464
465 case PTP_CLOCK_PPSUSR:
466 pps_event(ptp->pps_source, &event->pps_times,
467 PTP_PPS_EVENT, NULL);
468 break;
469 }
470}
471EXPORT_SYMBOL(ptp_clock_event);
472
473int ptp_clock_index(struct ptp_clock *ptp)
474{
475 return ptp->index;
476}
477EXPORT_SYMBOL(ptp_clock_index);
478
479int ptp_find_pin(struct ptp_clock *ptp,
480 enum ptp_pin_function func, unsigned int chan)
481{
482 struct ptp_pin_desc *pin = NULL;
483 int i;
484
485 for (i = 0; i < ptp->info->n_pins; i++) {
486 if (ptp->info->pin_config[i].func == func &&
487 ptp->info->pin_config[i].chan == chan) {
488 pin = &ptp->info->pin_config[i];
489 break;
490 }
491 }
492
493 return pin ? i : -1;
494}
495EXPORT_SYMBOL(ptp_find_pin);
496
497int ptp_find_pin_unlocked(struct ptp_clock *ptp,
498 enum ptp_pin_function func, unsigned int chan)
499{
500 int result;
501
502 mutex_lock(&ptp->pincfg_mux);
503
504 result = ptp_find_pin(ptp, func, chan);
505
506 mutex_unlock(&ptp->pincfg_mux);
507
508 return result;
509}
510EXPORT_SYMBOL(ptp_find_pin_unlocked);
511
512int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay)
513{
514 return kthread_mod_delayed_work(ptp->kworker, &ptp->aux_work, delay);
515}
516EXPORT_SYMBOL(ptp_schedule_worker);
517
518void ptp_cancel_worker_sync(struct ptp_clock *ptp)
519{
520 kthread_cancel_delayed_work_sync(&ptp->aux_work);
521}
522EXPORT_SYMBOL(ptp_cancel_worker_sync);
523
524/* module operations */
525
526static void __exit ptp_exit(void)
527{
528 class_unregister(&ptp_class);
529 unregister_chrdev_region(ptp_devt, MINORMASK + 1);
530 xa_destroy(&ptp_clocks_map);
531}
532
533static int __init ptp_init(void)
534{
535 int err;
536
537 err = class_register(&ptp_class);
538 if (err) {
539 pr_err("ptp: failed to allocate class\n");
540 return err;
541 }
542
543 err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
544 if (err < 0) {
545 pr_err("ptp: failed to allocate device region\n");
546 goto no_region;
547 }
548
549 pr_info("PTP clock support registered\n");
550 return 0;
551
552no_region:
553 class_unregister(&ptp_class);
554 return err;
555}
556
557subsys_initcall(ptp_init);
558module_exit(ptp_exit);
559
560MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
561MODULE_DESCRIPTION("PTP clocks support");
562MODULE_LICENSE("GPL");
1/*
2 * PTP 1588 clock support
3 *
4 * Copyright (C) 2010 OMICRON electronics GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20#include <linux/idr.h>
21#include <linux/device.h>
22#include <linux/err.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/posix-clock.h>
27#include <linux/pps_kernel.h>
28#include <linux/slab.h>
29#include <linux/syscalls.h>
30#include <linux/uaccess.h>
31
32#include "ptp_private.h"
33
34#define PTP_MAX_ALARMS 4
35#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT)
36#define PTP_PPS_EVENT PPS_CAPTUREASSERT
37#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
38
39/* private globals */
40
41static dev_t ptp_devt;
42static struct class *ptp_class;
43
44static DEFINE_IDA(ptp_clocks_map);
45
46/* time stamp event queue operations */
47
48static inline int queue_free(struct timestamp_event_queue *q)
49{
50 return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
51}
52
53static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
54 struct ptp_clock_event *src)
55{
56 struct ptp_extts_event *dst;
57 unsigned long flags;
58 s64 seconds;
59 u32 remainder;
60
61 seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
62
63 spin_lock_irqsave(&queue->lock, flags);
64
65 dst = &queue->buf[queue->tail];
66 dst->index = src->index;
67 dst->t.sec = seconds;
68 dst->t.nsec = remainder;
69
70 if (!queue_free(queue))
71 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
72
73 queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS;
74
75 spin_unlock_irqrestore(&queue->lock, flags);
76}
77
78static s32 scaled_ppm_to_ppb(long ppm)
79{
80 /*
81 * The 'freq' field in the 'struct timex' is in parts per
82 * million, but with a 16 bit binary fractional field.
83 *
84 * We want to calculate
85 *
86 * ppb = scaled_ppm * 1000 / 2^16
87 *
88 * which simplifies to
89 *
90 * ppb = scaled_ppm * 125 / 2^13
91 */
92 s64 ppb = 1 + ppm;
93 ppb *= 125;
94 ppb >>= 13;
95 return (s32) ppb;
96}
97
98/* posix clock implementation */
99
100static int ptp_clock_getres(struct posix_clock *pc, struct timespec *tp)
101{
102 tp->tv_sec = 0;
103 tp->tv_nsec = 1;
104 return 0;
105}
106
107static int ptp_clock_settime(struct posix_clock *pc, const struct timespec *tp)
108{
109 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
110 return ptp->info->settime(ptp->info, tp);
111}
112
113static int ptp_clock_gettime(struct posix_clock *pc, struct timespec *tp)
114{
115 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
116 return ptp->info->gettime(ptp->info, tp);
117}
118
119static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx)
120{
121 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
122 struct ptp_clock_info *ops;
123 int err = -EOPNOTSUPP;
124
125 ops = ptp->info;
126
127 if (tx->modes & ADJ_SETOFFSET) {
128 struct timespec ts;
129 ktime_t kt;
130 s64 delta;
131
132 ts.tv_sec = tx->time.tv_sec;
133 ts.tv_nsec = tx->time.tv_usec;
134
135 if (!(tx->modes & ADJ_NANO))
136 ts.tv_nsec *= 1000;
137
138 if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
139 return -EINVAL;
140
141 kt = timespec_to_ktime(ts);
142 delta = ktime_to_ns(kt);
143 err = ops->adjtime(ops, delta);
144 } else if (tx->modes & ADJ_FREQUENCY) {
145 err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq));
146 ptp->dialed_frequency = tx->freq;
147 } else if (tx->modes == 0) {
148 tx->freq = ptp->dialed_frequency;
149 err = 0;
150 }
151
152 return err;
153}
154
155static struct posix_clock_operations ptp_clock_ops = {
156 .owner = THIS_MODULE,
157 .clock_adjtime = ptp_clock_adjtime,
158 .clock_gettime = ptp_clock_gettime,
159 .clock_getres = ptp_clock_getres,
160 .clock_settime = ptp_clock_settime,
161 .ioctl = ptp_ioctl,
162 .open = ptp_open,
163 .poll = ptp_poll,
164 .read = ptp_read,
165};
166
167static void delete_ptp_clock(struct posix_clock *pc)
168{
169 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
170
171 mutex_destroy(&ptp->tsevq_mux);
172 mutex_destroy(&ptp->pincfg_mux);
173 ida_simple_remove(&ptp_clocks_map, ptp->index);
174 kfree(ptp);
175}
176
177/* public interface */
178
179struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
180 struct device *parent)
181{
182 struct ptp_clock *ptp;
183 int err = 0, index, major = MAJOR(ptp_devt);
184
185 if (info->n_alarm > PTP_MAX_ALARMS)
186 return ERR_PTR(-EINVAL);
187
188 /* Initialize a clock structure. */
189 err = -ENOMEM;
190 ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
191 if (ptp == NULL)
192 goto no_memory;
193
194 index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL);
195 if (index < 0) {
196 err = index;
197 goto no_slot;
198 }
199
200 ptp->clock.ops = ptp_clock_ops;
201 ptp->clock.release = delete_ptp_clock;
202 ptp->info = info;
203 ptp->devid = MKDEV(major, index);
204 ptp->index = index;
205 spin_lock_init(&ptp->tsevq.lock);
206 mutex_init(&ptp->tsevq_mux);
207 mutex_init(&ptp->pincfg_mux);
208 init_waitqueue_head(&ptp->tsev_wq);
209
210 /* Create a new device in our class. */
211 ptp->dev = device_create(ptp_class, parent, ptp->devid, ptp,
212 "ptp%d", ptp->index);
213 if (IS_ERR(ptp->dev))
214 goto no_device;
215
216 dev_set_drvdata(ptp->dev, ptp);
217
218 err = ptp_populate_sysfs(ptp);
219 if (err)
220 goto no_sysfs;
221
222 /* Register a new PPS source. */
223 if (info->pps) {
224 struct pps_source_info pps;
225 memset(&pps, 0, sizeof(pps));
226 snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
227 pps.mode = PTP_PPS_MODE;
228 pps.owner = info->owner;
229 ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
230 if (!ptp->pps_source) {
231 pr_err("failed to register pps source\n");
232 goto no_pps;
233 }
234 }
235
236 /* Create a posix clock. */
237 err = posix_clock_register(&ptp->clock, ptp->devid);
238 if (err) {
239 pr_err("failed to create posix clock\n");
240 goto no_clock;
241 }
242
243 return ptp;
244
245no_clock:
246 if (ptp->pps_source)
247 pps_unregister_source(ptp->pps_source);
248no_pps:
249 ptp_cleanup_sysfs(ptp);
250no_sysfs:
251 device_destroy(ptp_class, ptp->devid);
252no_device:
253 mutex_destroy(&ptp->tsevq_mux);
254 mutex_destroy(&ptp->pincfg_mux);
255no_slot:
256 kfree(ptp);
257no_memory:
258 return ERR_PTR(err);
259}
260EXPORT_SYMBOL(ptp_clock_register);
261
262int ptp_clock_unregister(struct ptp_clock *ptp)
263{
264 ptp->defunct = 1;
265 wake_up_interruptible(&ptp->tsev_wq);
266
267 /* Release the clock's resources. */
268 if (ptp->pps_source)
269 pps_unregister_source(ptp->pps_source);
270 ptp_cleanup_sysfs(ptp);
271 device_destroy(ptp_class, ptp->devid);
272
273 posix_clock_unregister(&ptp->clock);
274 return 0;
275}
276EXPORT_SYMBOL(ptp_clock_unregister);
277
278void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
279{
280 struct pps_event_time evt;
281
282 switch (event->type) {
283
284 case PTP_CLOCK_ALARM:
285 break;
286
287 case PTP_CLOCK_EXTTS:
288 enqueue_external_timestamp(&ptp->tsevq, event);
289 wake_up_interruptible(&ptp->tsev_wq);
290 break;
291
292 case PTP_CLOCK_PPS:
293 pps_get_ts(&evt);
294 pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
295 break;
296
297 case PTP_CLOCK_PPSUSR:
298 pps_event(ptp->pps_source, &event->pps_times,
299 PTP_PPS_EVENT, NULL);
300 break;
301 }
302}
303EXPORT_SYMBOL(ptp_clock_event);
304
305int ptp_clock_index(struct ptp_clock *ptp)
306{
307 return ptp->index;
308}
309EXPORT_SYMBOL(ptp_clock_index);
310
311int ptp_find_pin(struct ptp_clock *ptp,
312 enum ptp_pin_function func, unsigned int chan)
313{
314 struct ptp_pin_desc *pin = NULL;
315 int i;
316
317 mutex_lock(&ptp->pincfg_mux);
318 for (i = 0; i < ptp->info->n_pins; i++) {
319 if (ptp->info->pin_config[i].func == func &&
320 ptp->info->pin_config[i].chan == chan) {
321 pin = &ptp->info->pin_config[i];
322 break;
323 }
324 }
325 mutex_unlock(&ptp->pincfg_mux);
326
327 return pin ? i : -1;
328}
329EXPORT_SYMBOL(ptp_find_pin);
330
331/* module operations */
332
333static void __exit ptp_exit(void)
334{
335 class_destroy(ptp_class);
336 unregister_chrdev_region(ptp_devt, MINORMASK + 1);
337 ida_destroy(&ptp_clocks_map);
338}
339
340static int __init ptp_init(void)
341{
342 int err;
343
344 ptp_class = class_create(THIS_MODULE, "ptp");
345 if (IS_ERR(ptp_class)) {
346 pr_err("ptp: failed to allocate class\n");
347 return PTR_ERR(ptp_class);
348 }
349
350 err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
351 if (err < 0) {
352 pr_err("ptp: failed to allocate device region\n");
353 goto no_region;
354 }
355
356 ptp_class->dev_groups = ptp_groups;
357 pr_info("PTP clock support registered\n");
358 return 0;
359
360no_region:
361 class_destroy(ptp_class);
362 return err;
363}
364
365subsys_initcall(ptp_init);
366module_exit(ptp_exit);
367
368MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
369MODULE_DESCRIPTION("PTP clocks support");
370MODULE_LICENSE("GPL");