1 // SPDX-License-Identifier: GPL-2.0+
2 
3 #include <linux/ptp_classify.h>
4 
5 #include "lan966x_main.h"
6 
7 #define LAN966X_MAX_PTP_ID	512
8 
9 /* Represents 1ppm adjustment in 2^59 format with 6.037735849ns as reference
10  * The value is calculated as following: (1/1000000)/((2^-59)/6.037735849)
11  */
12 #define LAN966X_1PPM_FORMAT		3480517749723LL
13 
14 /* Represents 1ppb adjustment in 2^29 format with 6.037735849ns as reference
15  * The value is calculated as following: (1/1000000000)/((2^59)/6.037735849)
16  */
17 #define LAN966X_1PPB_FORMAT		3480517749LL
18 
19 #define TOD_ACC_PIN		0x5
20 
21 enum {
22 	PTP_PIN_ACTION_IDLE = 0,
23 	PTP_PIN_ACTION_LOAD,
24 	PTP_PIN_ACTION_SAVE,
25 	PTP_PIN_ACTION_CLOCK,
26 	PTP_PIN_ACTION_DELTA,
27 	PTP_PIN_ACTION_TOD
28 };
29 
30 static u64 lan966x_ptp_get_nominal_value(void)
31 {
32 	/* This is the default value that for each system clock, the time of day
33 	 * is increased. It has the format 5.59 nanosecond.
34 	 */
35 	return 0x304d4873ecade305;
36 }
37 
38 int lan966x_ptp_hwtstamp_set(struct lan966x_port *port, struct ifreq *ifr)
39 {
40 	struct lan966x *lan966x = port->lan966x;
41 	struct hwtstamp_config cfg;
42 	struct lan966x_phc *phc;
43 
44 	/* For now don't allow to run ptp on ports that are part of a bridge,
45 	 * because in case of transparent clock the HW will still forward the
46 	 * frames, so there would be duplicate frames
47 	 */
48 	if (lan966x->bridge_mask & BIT(port->chip_port))
49 		return -EINVAL;
50 
51 	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
52 		return -EFAULT;
53 
54 	switch (cfg.tx_type) {
55 	case HWTSTAMP_TX_ON:
56 		port->ptp_cmd = IFH_REW_OP_TWO_STEP_PTP;
57 		break;
58 	case HWTSTAMP_TX_ONESTEP_SYNC:
59 		port->ptp_cmd = IFH_REW_OP_ONE_STEP_PTP;
60 		break;
61 	case HWTSTAMP_TX_OFF:
62 		port->ptp_cmd = IFH_REW_OP_NOOP;
63 		break;
64 	default:
65 		return -ERANGE;
66 	}
67 
68 	switch (cfg.rx_filter) {
69 	case HWTSTAMP_FILTER_NONE:
70 		break;
71 	case HWTSTAMP_FILTER_ALL:
72 	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
73 	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
74 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
75 	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
76 	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
77 	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
78 	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
79 	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
80 	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
81 	case HWTSTAMP_FILTER_PTP_V2_EVENT:
82 	case HWTSTAMP_FILTER_PTP_V2_SYNC:
83 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
84 	case HWTSTAMP_FILTER_NTP_ALL:
85 		cfg.rx_filter = HWTSTAMP_FILTER_ALL;
86 		break;
87 	default:
88 		return -ERANGE;
89 	}
90 
91 	/* Commit back the result & save it */
92 	mutex_lock(&lan966x->ptp_lock);
93 	phc = &lan966x->phc[LAN966X_PHC_PORT];
94 	memcpy(&phc->hwtstamp_config, &cfg, sizeof(cfg));
95 	mutex_unlock(&lan966x->ptp_lock);
96 
97 	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
98 }
99 
100 int lan966x_ptp_hwtstamp_get(struct lan966x_port *port, struct ifreq *ifr)
101 {
102 	struct lan966x *lan966x = port->lan966x;
103 	struct lan966x_phc *phc;
104 
105 	phc = &lan966x->phc[LAN966X_PHC_PORT];
106 	return copy_to_user(ifr->ifr_data, &phc->hwtstamp_config,
107 			    sizeof(phc->hwtstamp_config)) ? -EFAULT : 0;
108 }
109 
110 static int lan966x_ptp_classify(struct lan966x_port *port, struct sk_buff *skb)
111 {
112 	struct ptp_header *header;
113 	u8 msgtype;
114 	int type;
115 
116 	if (port->ptp_cmd == IFH_REW_OP_NOOP)
117 		return IFH_REW_OP_NOOP;
118 
119 	type = ptp_classify_raw(skb);
120 	if (type == PTP_CLASS_NONE)
121 		return IFH_REW_OP_NOOP;
122 
123 	header = ptp_parse_header(skb, type);
124 	if (!header)
125 		return IFH_REW_OP_NOOP;
126 
127 	if (port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
128 		return IFH_REW_OP_TWO_STEP_PTP;
129 
130 	/* If it is sync and run 1 step then set the correct operation,
131 	 * otherwise run as 2 step
132 	 */
133 	msgtype = ptp_get_msgtype(header, type);
134 	if ((msgtype & 0xf) == 0)
135 		return IFH_REW_OP_ONE_STEP_PTP;
136 
137 	return IFH_REW_OP_TWO_STEP_PTP;
138 }
139 
140 static void lan966x_ptp_txtstamp_old_release(struct lan966x_port *port)
141 {
142 	struct sk_buff *skb, *skb_tmp;
143 	unsigned long flags;
144 
145 	spin_lock_irqsave(&port->tx_skbs.lock, flags);
146 	skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
147 		if time_after(LAN966X_SKB_CB(skb)->jiffies + LAN966X_PTP_TIMEOUT,
148 			      jiffies)
149 			break;
150 
151 		__skb_unlink(skb, &port->tx_skbs);
152 		dev_kfree_skb_any(skb);
153 	}
154 	spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
155 }
156 
157 int lan966x_ptp_txtstamp_request(struct lan966x_port *port,
158 				 struct sk_buff *skb)
159 {
160 	struct lan966x *lan966x = port->lan966x;
161 	unsigned long flags;
162 	u8 rew_op;
163 
164 	rew_op = lan966x_ptp_classify(port, skb);
165 	LAN966X_SKB_CB(skb)->rew_op = rew_op;
166 
167 	if (rew_op != IFH_REW_OP_TWO_STEP_PTP)
168 		return 0;
169 
170 	lan966x_ptp_txtstamp_old_release(port);
171 
172 	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
173 	if (lan966x->ptp_skbs == LAN966X_MAX_PTP_ID) {
174 		spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
175 		return -EBUSY;
176 	}
177 
178 	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
179 
180 	skb_queue_tail(&port->tx_skbs, skb);
181 	LAN966X_SKB_CB(skb)->ts_id = port->ts_id;
182 	LAN966X_SKB_CB(skb)->jiffies = jiffies;
183 
184 	lan966x->ptp_skbs++;
185 	port->ts_id++;
186 	if (port->ts_id == LAN966X_MAX_PTP_ID)
187 		port->ts_id = 0;
188 
189 	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
190 
191 	return 0;
192 }
193 
194 void lan966x_ptp_txtstamp_release(struct lan966x_port *port,
195 				  struct sk_buff *skb)
196 {
197 	struct lan966x *lan966x = port->lan966x;
198 	unsigned long flags;
199 
200 	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
201 	port->ts_id--;
202 	lan966x->ptp_skbs--;
203 	skb_unlink(skb, &port->tx_skbs);
204 	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
205 }
206 
207 static void lan966x_get_hwtimestamp(struct lan966x *lan966x,
208 				    struct timespec64 *ts,
209 				    u32 nsec)
210 {
211 	/* Read current PTP time to get seconds */
212 	unsigned long flags;
213 	u32 curr_nsec;
214 
215 	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
216 
217 	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
218 		PTP_PIN_CFG_PIN_DOM_SET(LAN966X_PHC_PORT) |
219 		PTP_PIN_CFG_PIN_SYNC_SET(0),
220 		PTP_PIN_CFG_PIN_ACTION |
221 		PTP_PIN_CFG_PIN_DOM |
222 		PTP_PIN_CFG_PIN_SYNC,
223 		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
224 
225 	ts->tv_sec = lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
226 	curr_nsec = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
227 
228 	ts->tv_nsec = nsec;
229 
230 	/* Sec has incremented since the ts was registered */
231 	if (curr_nsec < nsec)
232 		ts->tv_sec--;
233 
234 	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
235 }
236 
237 irqreturn_t lan966x_ptp_irq_handler(int irq, void *args)
238 {
239 	int budget = LAN966X_MAX_PTP_ID;
240 	struct lan966x *lan966x = args;
241 
242 	while (budget--) {
243 		struct sk_buff *skb, *skb_tmp, *skb_match = NULL;
244 		struct skb_shared_hwtstamps shhwtstamps;
245 		struct lan966x_port *port;
246 		struct timespec64 ts;
247 		unsigned long flags;
248 		u32 val, id, txport;
249 		u32 delay;
250 
251 		val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
252 
253 		/* Check if a timestamp can be retrieved */
254 		if (!(val & PTP_TWOSTEP_CTRL_VLD))
255 			break;
256 
257 		WARN_ON(val & PTP_TWOSTEP_CTRL_OVFL);
258 
259 		if (!(val & PTP_TWOSTEP_CTRL_STAMP_TX))
260 			continue;
261 
262 		/* Retrieve the ts Tx port */
263 		txport = PTP_TWOSTEP_CTRL_STAMP_PORT_GET(val);
264 
265 		/* Retrieve its associated skb */
266 		port = lan966x->ports[txport];
267 
268 		/* Retrieve the delay */
269 		delay = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
270 		delay = PTP_TWOSTEP_STAMP_STAMP_NSEC_GET(delay);
271 
272 		/* Get next timestamp from fifo, which needs to be the
273 		 * rx timestamp which represents the id of the frame
274 		 */
275 		lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
276 			PTP_TWOSTEP_CTRL_NXT,
277 			lan966x, PTP_TWOSTEP_CTRL);
278 
279 		val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
280 
281 		/* Check if a timestamp can be retried */
282 		if (!(val & PTP_TWOSTEP_CTRL_VLD))
283 			break;
284 
285 		/* Read RX timestamping to get the ID */
286 		id = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
287 
288 		spin_lock_irqsave(&port->tx_skbs.lock, flags);
289 		skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
290 			if (LAN966X_SKB_CB(skb)->ts_id != id)
291 				continue;
292 
293 			__skb_unlink(skb, &port->tx_skbs);
294 			skb_match = skb;
295 			break;
296 		}
297 		spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
298 
299 		/* Next ts */
300 		lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
301 			PTP_TWOSTEP_CTRL_NXT,
302 			lan966x, PTP_TWOSTEP_CTRL);
303 
304 		if (WARN_ON(!skb_match))
305 			continue;
306 
307 		spin_lock(&lan966x->ptp_ts_id_lock);
308 		lan966x->ptp_skbs--;
309 		spin_unlock(&lan966x->ptp_ts_id_lock);
310 
311 		/* Get the h/w timestamp */
312 		lan966x_get_hwtimestamp(lan966x, &ts, delay);
313 
314 		/* Set the timestamp into the skb */
315 		shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
316 		skb_tstamp_tx(skb_match, &shhwtstamps);
317 
318 		dev_kfree_skb_any(skb_match);
319 	}
320 
321 	return IRQ_HANDLED;
322 }
323 
324 static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
325 {
326 	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
327 	struct lan966x *lan966x = phc->lan966x;
328 	unsigned long flags;
329 	bool neg_adj = 0;
330 	u64 tod_inc;
331 	u64 ref;
332 
333 	if (!scaled_ppm)
334 		return 0;
335 
336 	if (scaled_ppm < 0) {
337 		neg_adj = 1;
338 		scaled_ppm = -scaled_ppm;
339 	}
340 
341 	tod_inc = lan966x_ptp_get_nominal_value();
342 
343 	/* The multiplication is split in 2 separate additions because of
344 	 * overflow issues. If scaled_ppm with 16bit fractional part was bigger
345 	 * than 20ppm then we got overflow.
346 	 */
347 	ref = LAN966X_1PPM_FORMAT * (scaled_ppm >> 16);
348 	ref += (LAN966X_1PPM_FORMAT * (0xffff & scaled_ppm)) >> 16;
349 	tod_inc = neg_adj ? tod_inc - ref : tod_inc + ref;
350 
351 	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
352 
353 	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(1 << BIT(phc->index)),
354 		PTP_DOM_CFG_CLKCFG_DIS,
355 		lan966x, PTP_DOM_CFG);
356 
357 	lan_wr((u32)tod_inc & 0xFFFFFFFF, lan966x,
358 	       PTP_CLK_PER_CFG(phc->index, 0));
359 	lan_wr((u32)(tod_inc >> 32), lan966x,
360 	       PTP_CLK_PER_CFG(phc->index, 1));
361 
362 	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
363 		PTP_DOM_CFG_CLKCFG_DIS,
364 		lan966x, PTP_DOM_CFG);
365 
366 	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
367 
368 	return 0;
369 }
370 
371 static int lan966x_ptp_settime64(struct ptp_clock_info *ptp,
372 				 const struct timespec64 *ts)
373 {
374 	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
375 	struct lan966x *lan966x = phc->lan966x;
376 	unsigned long flags;
377 
378 	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
379 
380 	/* Must be in IDLE mode before the time can be loaded */
381 	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
382 		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
383 		PTP_PIN_CFG_PIN_SYNC_SET(0),
384 		PTP_PIN_CFG_PIN_ACTION |
385 		PTP_PIN_CFG_PIN_DOM |
386 		PTP_PIN_CFG_PIN_SYNC,
387 		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
388 
389 	/* Set new value */
390 	lan_wr(PTP_TOD_SEC_MSB_TOD_SEC_MSB_SET(upper_32_bits(ts->tv_sec)),
391 	       lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
392 	lan_wr(lower_32_bits(ts->tv_sec),
393 	       lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
394 	lan_wr(ts->tv_nsec, lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
395 
396 	/* Apply new values */
397 	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_LOAD) |
398 		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
399 		PTP_PIN_CFG_PIN_SYNC_SET(0),
400 		PTP_PIN_CFG_PIN_ACTION |
401 		PTP_PIN_CFG_PIN_DOM |
402 		PTP_PIN_CFG_PIN_SYNC,
403 		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
404 
405 	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
406 
407 	return 0;
408 }
409 
410 static int lan966x_ptp_gettime64(struct ptp_clock_info *ptp,
411 				 struct timespec64 *ts)
412 {
413 	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
414 	struct lan966x *lan966x = phc->lan966x;
415 	unsigned long flags;
416 	time64_t s;
417 	s64 ns;
418 
419 	spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
420 
421 	lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
422 		PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
423 		PTP_PIN_CFG_PIN_SYNC_SET(0),
424 		PTP_PIN_CFG_PIN_ACTION |
425 		PTP_PIN_CFG_PIN_DOM |
426 		PTP_PIN_CFG_PIN_SYNC,
427 		lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
428 
429 	s = lan_rd(lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
430 	s <<= 32;
431 	s |= lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
432 	ns = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
433 	ns &= PTP_TOD_NSEC_TOD_NSEC;
434 
435 	spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
436 
437 	/* Deal with negative values */
438 	if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
439 		s--;
440 		ns &= 0xf;
441 		ns += 999999984;
442 	}
443 
444 	set_normalized_timespec64(ts, s, ns);
445 	return 0;
446 }
447 
448 static int lan966x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
449 {
450 	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
451 	struct lan966x *lan966x = phc->lan966x;
452 
453 	if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
454 		unsigned long flags;
455 
456 		spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
457 
458 		/* Must be in IDLE mode before the time can be loaded */
459 		lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
460 			PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
461 			PTP_PIN_CFG_PIN_SYNC_SET(0),
462 			PTP_PIN_CFG_PIN_ACTION |
463 			PTP_PIN_CFG_PIN_DOM |
464 			PTP_PIN_CFG_PIN_SYNC,
465 			lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
466 
467 		lan_wr(PTP_TOD_NSEC_TOD_NSEC_SET(delta),
468 		       lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
469 
470 		/* Adjust time with the value of PTP_TOD_NSEC */
471 		lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_DELTA) |
472 			PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
473 			PTP_PIN_CFG_PIN_SYNC_SET(0),
474 			PTP_PIN_CFG_PIN_ACTION |
475 			PTP_PIN_CFG_PIN_DOM |
476 			PTP_PIN_CFG_PIN_SYNC,
477 			lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
478 
479 		spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
480 	} else {
481 		/* Fall back using lan966x_ptp_settime64 which is not exact */
482 		struct timespec64 ts;
483 		u64 now;
484 
485 		lan966x_ptp_gettime64(ptp, &ts);
486 
487 		now = ktime_to_ns(timespec64_to_ktime(ts));
488 		ts = ns_to_timespec64(now + delta);
489 
490 		lan966x_ptp_settime64(ptp, &ts);
491 	}
492 
493 	return 0;
494 }
495 
496 static struct ptp_clock_info lan966x_ptp_clock_info = {
497 	.owner		= THIS_MODULE,
498 	.name		= "lan966x ptp",
499 	.max_adj	= 200000,
500 	.gettime64	= lan966x_ptp_gettime64,
501 	.settime64	= lan966x_ptp_settime64,
502 	.adjtime	= lan966x_ptp_adjtime,
503 	.adjfine	= lan966x_ptp_adjfine,
504 };
505 
506 static int lan966x_ptp_phc_init(struct lan966x *lan966x,
507 				int index,
508 				struct ptp_clock_info *clock_info)
509 {
510 	struct lan966x_phc *phc = &lan966x->phc[index];
511 
512 	phc->info = *clock_info;
513 	phc->clock = ptp_clock_register(&phc->info, lan966x->dev);
514 	if (IS_ERR(phc->clock))
515 		return PTR_ERR(phc->clock);
516 
517 	phc->index = index;
518 	phc->lan966x = lan966x;
519 
520 	/* PTP Rx stamping is always enabled.  */
521 	phc->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
522 
523 	return 0;
524 }
525 
526 int lan966x_ptp_init(struct lan966x *lan966x)
527 {
528 	u64 tod_adj = lan966x_ptp_get_nominal_value();
529 	struct lan966x_port *port;
530 	int err, i;
531 
532 	if (!lan966x->ptp)
533 		return 0;
534 
535 	for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
536 		err = lan966x_ptp_phc_init(lan966x, i, &lan966x_ptp_clock_info);
537 		if (err)
538 			return err;
539 	}
540 
541 	spin_lock_init(&lan966x->ptp_clock_lock);
542 	spin_lock_init(&lan966x->ptp_ts_id_lock);
543 	mutex_init(&lan966x->ptp_lock);
544 
545 	/* Disable master counters */
546 	lan_wr(PTP_DOM_CFG_ENA_SET(0), lan966x, PTP_DOM_CFG);
547 
548 	/* Configure the nominal TOD increment per clock cycle */
549 	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0x7),
550 		PTP_DOM_CFG_CLKCFG_DIS,
551 		lan966x, PTP_DOM_CFG);
552 
553 	for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
554 		lan_wr((u32)tod_adj & 0xFFFFFFFF, lan966x,
555 		       PTP_CLK_PER_CFG(i, 0));
556 		lan_wr((u32)(tod_adj >> 32), lan966x,
557 		       PTP_CLK_PER_CFG(i, 1));
558 	}
559 
560 	lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
561 		PTP_DOM_CFG_CLKCFG_DIS,
562 		lan966x, PTP_DOM_CFG);
563 
564 	/* Enable master counters */
565 	lan_wr(PTP_DOM_CFG_ENA_SET(0x7), lan966x, PTP_DOM_CFG);
566 
567 	for (i = 0; i < lan966x->num_phys_ports; i++) {
568 		port = lan966x->ports[i];
569 		if (!port)
570 			continue;
571 
572 		skb_queue_head_init(&port->tx_skbs);
573 	}
574 
575 	return 0;
576 }
577 
578 void lan966x_ptp_deinit(struct lan966x *lan966x)
579 {
580 	struct lan966x_port *port;
581 	int i;
582 
583 	for (i = 0; i < lan966x->num_phys_ports; i++) {
584 		port = lan966x->ports[i];
585 		if (!port)
586 			continue;
587 
588 		skb_queue_purge(&port->tx_skbs);
589 	}
590 
591 	for (i = 0; i < LAN966X_PHC_COUNT; ++i)
592 		ptp_clock_unregister(lan966x->phc[i].clock);
593 }
594 
595 void lan966x_ptp_rxtstamp(struct lan966x *lan966x, struct sk_buff *skb,
596 			  u64 timestamp)
597 {
598 	struct skb_shared_hwtstamps *shhwtstamps;
599 	struct lan966x_phc *phc;
600 	struct timespec64 ts;
601 	u64 full_ts_in_ns;
602 
603 	if (!lan966x->ptp)
604 		return;
605 
606 	phc = &lan966x->phc[LAN966X_PHC_PORT];
607 	lan966x_ptp_gettime64(&phc->info, &ts);
608 
609 	/* Drop the sub-ns precision */
610 	timestamp = timestamp >> 2;
611 	if (ts.tv_nsec < timestamp)
612 		ts.tv_sec--;
613 	ts.tv_nsec = timestamp;
614 	full_ts_in_ns = ktime_set(ts.tv_sec, ts.tv_nsec);
615 
616 	shhwtstamps = skb_hwtstamps(skb);
617 	shhwtstamps->hwtstamp = full_ts_in_ns;
618 }
619