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1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/ptp_classify.h>
4
5#include "lan966x_main.h"
6#include "vcap_api.h"
7#include "vcap_api_client.h"
8
9#define LAN966X_MAX_PTP_ID 512
10
11/* Represents 1ppm adjustment in 2^59 format with 6.037735849ns as reference
12 * The value is calculated as following: (1/1000000)/((2^-59)/6.037735849)
13 */
14#define LAN966X_1PPM_FORMAT 3480517749723LL
15
16/* Represents 1ppb adjustment in 2^29 format with 6.037735849ns as reference
17 * The value is calculated as following: (1/1000000000)/((2^59)/6.037735849)
18 */
19#define LAN966X_1PPB_FORMAT 3480517749LL
20
21#define TOD_ACC_PIN 0x7
22
23/* This represents the base rule ID for the PTP rules that are added in the
24 * VCAP to trap frames to CPU. This number needs to be bigger than the maximum
25 * number of entries that can exist in the VCAP.
26 */
27#define LAN966X_VCAP_PTP_RULE_ID 1000000
28#define LAN966X_VCAP_L2_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 0)
29#define LAN966X_VCAP_IPV4_EV_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 1)
30#define LAN966X_VCAP_IPV4_GEN_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 2)
31#define LAN966X_VCAP_IPV6_EV_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 3)
32#define LAN966X_VCAP_IPV6_GEN_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 4)
33
34enum {
35 PTP_PIN_ACTION_IDLE = 0,
36 PTP_PIN_ACTION_LOAD,
37 PTP_PIN_ACTION_SAVE,
38 PTP_PIN_ACTION_CLOCK,
39 PTP_PIN_ACTION_DELTA,
40 PTP_PIN_ACTION_TOD
41};
42
43static u64 lan966x_ptp_get_nominal_value(void)
44{
45 /* This is the default value that for each system clock, the time of day
46 * is increased. It has the format 5.59 nanosecond.
47 */
48 return 0x304d4873ecade305;
49}
50
51static int lan966x_ptp_add_trap(struct lan966x_port *port,
52 int (*add_ptp_key)(struct vcap_rule *vrule,
53 struct lan966x_port*),
54 u32 rule_id,
55 u16 proto)
56{
57 struct lan966x *lan966x = port->lan966x;
58 struct vcap_rule *vrule;
59 int err;
60
61 vrule = vcap_get_rule(lan966x->vcap_ctrl, rule_id);
62 if (vrule) {
63 u32 value, mask;
64
65 /* Just modify the ingress port mask and exit */
66 vcap_rule_get_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK,
67 &value, &mask);
68 mask &= ~BIT(port->chip_port);
69 vcap_rule_mod_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK,
70 value, mask);
71
72 err = vcap_mod_rule(vrule);
73 goto free_rule;
74 }
75
76 vrule = vcap_alloc_rule(lan966x->vcap_ctrl, port->dev,
77 LAN966X_VCAP_CID_IS2_L0,
78 VCAP_USER_PTP, 0, rule_id);
79 if (IS_ERR(vrule))
80 return PTR_ERR(vrule);
81
82 err = add_ptp_key(vrule, port);
83 if (err)
84 goto free_rule;
85
86 err = vcap_set_rule_set_actionset(vrule, VCAP_AFS_BASE_TYPE);
87 err |= vcap_rule_add_action_bit(vrule, VCAP_AF_CPU_COPY_ENA, VCAP_BIT_1);
88 err |= vcap_rule_add_action_u32(vrule, VCAP_AF_MASK_MODE, LAN966X_PMM_REPLACE);
89 err |= vcap_val_rule(vrule, proto);
90 if (err)
91 goto free_rule;
92
93 err = vcap_add_rule(vrule);
94
95free_rule:
96 /* Free the local copy of the rule */
97 vcap_free_rule(vrule);
98 return err;
99}
100
101static int lan966x_ptp_del_trap(struct lan966x_port *port,
102 u32 rule_id)
103{
104 struct lan966x *lan966x = port->lan966x;
105 struct vcap_rule *vrule;
106 u32 value, mask;
107 int err;
108
109 vrule = vcap_get_rule(lan966x->vcap_ctrl, rule_id);
110 if (!vrule)
111 return -EEXIST;
112
113 vcap_rule_get_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, &value, &mask);
114 mask |= BIT(port->chip_port);
115
116 /* No other port requires this trap, so it is safe to remove it */
117 if (mask == GENMASK(lan966x->num_phys_ports, 0)) {
118 err = vcap_del_rule(lan966x->vcap_ctrl, port->dev, rule_id);
119 goto free_rule;
120 }
121
122 vcap_rule_mod_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, value, mask);
123 err = vcap_mod_rule(vrule);
124
125free_rule:
126 vcap_free_rule(vrule);
127 return err;
128}
129
130static int lan966x_ptp_add_l2_key(struct vcap_rule *vrule,
131 struct lan966x_port *port)
132{
133 return vcap_rule_add_key_u32(vrule, VCAP_KF_ETYPE, ETH_P_1588, ~0);
134}
135
136static int lan966x_ptp_add_ip_event_key(struct vcap_rule *vrule,
137 struct lan966x_port *port)
138{
139 return vcap_rule_add_key_u32(vrule, VCAP_KF_L4_DPORT, PTP_EV_PORT, ~0) ||
140 vcap_rule_add_key_bit(vrule, VCAP_KF_TCP_IS, VCAP_BIT_0);
141}
142
143static int lan966x_ptp_add_ip_general_key(struct vcap_rule *vrule,
144 struct lan966x_port *port)
145{
146 return vcap_rule_add_key_u32(vrule, VCAP_KF_L4_DPORT, PTP_GEN_PORT, ~0) ||
147 vcap_rule_add_key_bit(vrule, VCAP_KF_TCP_IS, VCAP_BIT_0);
148}
149
150static int lan966x_ptp_add_l2_rule(struct lan966x_port *port)
151{
152 return lan966x_ptp_add_trap(port, lan966x_ptp_add_l2_key,
153 LAN966X_VCAP_L2_PTP_TRAP, ETH_P_ALL);
154}
155
156static int lan966x_ptp_add_ipv4_rules(struct lan966x_port *port)
157{
158 int err;
159
160 err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_event_key,
161 LAN966X_VCAP_IPV4_EV_PTP_TRAP, ETH_P_IP);
162 if (err)
163 return err;
164
165 err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_general_key,
166 LAN966X_VCAP_IPV4_GEN_PTP_TRAP, ETH_P_IP);
167 if (err)
168 lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV4_EV_PTP_TRAP);
169
170 return err;
171}
172
173static int lan966x_ptp_add_ipv6_rules(struct lan966x_port *port)
174{
175 int err;
176
177 err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_event_key,
178 LAN966X_VCAP_IPV6_EV_PTP_TRAP, ETH_P_IPV6);
179 if (err)
180 return err;
181
182 err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_general_key,
183 LAN966X_VCAP_IPV6_GEN_PTP_TRAP, ETH_P_IPV6);
184 if (err)
185 lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV6_EV_PTP_TRAP);
186
187 return err;
188}
189
190static int lan966x_ptp_del_l2_rule(struct lan966x_port *port)
191{
192 return lan966x_ptp_del_trap(port, LAN966X_VCAP_L2_PTP_TRAP);
193}
194
195static int lan966x_ptp_del_ipv4_rules(struct lan966x_port *port)
196{
197 int err;
198
199 err = lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV4_EV_PTP_TRAP);
200 err |= lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV4_GEN_PTP_TRAP);
201
202 return err;
203}
204
205static int lan966x_ptp_del_ipv6_rules(struct lan966x_port *port)
206{
207 int err;
208
209 err = lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV6_EV_PTP_TRAP);
210 err |= lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV6_GEN_PTP_TRAP);
211
212 return err;
213}
214
215static int lan966x_ptp_add_traps(struct lan966x_port *port)
216{
217 int err;
218
219 err = lan966x_ptp_add_l2_rule(port);
220 if (err)
221 goto err_l2;
222
223 err = lan966x_ptp_add_ipv4_rules(port);
224 if (err)
225 goto err_ipv4;
226
227 err = lan966x_ptp_add_ipv6_rules(port);
228 if (err)
229 goto err_ipv6;
230
231 return err;
232
233err_ipv6:
234 lan966x_ptp_del_ipv4_rules(port);
235err_ipv4:
236 lan966x_ptp_del_l2_rule(port);
237err_l2:
238 return err;
239}
240
241int lan966x_ptp_del_traps(struct lan966x_port *port)
242{
243 int err;
244
245 err = lan966x_ptp_del_l2_rule(port);
246 err |= lan966x_ptp_del_ipv4_rules(port);
247 err |= lan966x_ptp_del_ipv6_rules(port);
248
249 return err;
250}
251
252int lan966x_ptp_setup_traps(struct lan966x_port *port, struct ifreq *ifr)
253{
254 struct hwtstamp_config cfg;
255
256 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
257 return -EFAULT;
258
259 if (cfg.rx_filter == HWTSTAMP_FILTER_NONE)
260 return lan966x_ptp_del_traps(port);
261 else
262 return lan966x_ptp_add_traps(port);
263}
264
265int lan966x_ptp_hwtstamp_set(struct lan966x_port *port, struct ifreq *ifr)
266{
267 struct lan966x *lan966x = port->lan966x;
268 struct hwtstamp_config cfg;
269 struct lan966x_phc *phc;
270
271 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
272 return -EFAULT;
273
274 switch (cfg.tx_type) {
275 case HWTSTAMP_TX_ON:
276 port->ptp_cmd = IFH_REW_OP_TWO_STEP_PTP;
277 break;
278 case HWTSTAMP_TX_ONESTEP_SYNC:
279 port->ptp_cmd = IFH_REW_OP_ONE_STEP_PTP;
280 break;
281 case HWTSTAMP_TX_OFF:
282 port->ptp_cmd = IFH_REW_OP_NOOP;
283 break;
284 default:
285 return -ERANGE;
286 }
287
288 switch (cfg.rx_filter) {
289 case HWTSTAMP_FILTER_NONE:
290 break;
291 case HWTSTAMP_FILTER_ALL:
292 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
293 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
294 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
295 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
296 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
297 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
298 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
299 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
300 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
301 case HWTSTAMP_FILTER_PTP_V2_EVENT:
302 case HWTSTAMP_FILTER_PTP_V2_SYNC:
303 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
304 case HWTSTAMP_FILTER_NTP_ALL:
305 cfg.rx_filter = HWTSTAMP_FILTER_ALL;
306 break;
307 default:
308 return -ERANGE;
309 }
310
311 /* Commit back the result & save it */
312 mutex_lock(&lan966x->ptp_lock);
313 phc = &lan966x->phc[LAN966X_PHC_PORT];
314 memcpy(&phc->hwtstamp_config, &cfg, sizeof(cfg));
315 mutex_unlock(&lan966x->ptp_lock);
316
317 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
318}
319
320int lan966x_ptp_hwtstamp_get(struct lan966x_port *port, struct ifreq *ifr)
321{
322 struct lan966x *lan966x = port->lan966x;
323 struct lan966x_phc *phc;
324
325 phc = &lan966x->phc[LAN966X_PHC_PORT];
326 return copy_to_user(ifr->ifr_data, &phc->hwtstamp_config,
327 sizeof(phc->hwtstamp_config)) ? -EFAULT : 0;
328}
329
330static int lan966x_ptp_classify(struct lan966x_port *port, struct sk_buff *skb)
331{
332 struct ptp_header *header;
333 u8 msgtype;
334 int type;
335
336 if (port->ptp_cmd == IFH_REW_OP_NOOP)
337 return IFH_REW_OP_NOOP;
338
339 type = ptp_classify_raw(skb);
340 if (type == PTP_CLASS_NONE)
341 return IFH_REW_OP_NOOP;
342
343 header = ptp_parse_header(skb, type);
344 if (!header)
345 return IFH_REW_OP_NOOP;
346
347 if (port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
348 return IFH_REW_OP_TWO_STEP_PTP;
349
350 /* If it is sync and run 1 step then set the correct operation,
351 * otherwise run as 2 step
352 */
353 msgtype = ptp_get_msgtype(header, type);
354 if ((msgtype & 0xf) == 0)
355 return IFH_REW_OP_ONE_STEP_PTP;
356
357 return IFH_REW_OP_TWO_STEP_PTP;
358}
359
360static void lan966x_ptp_txtstamp_old_release(struct lan966x_port *port)
361{
362 struct sk_buff *skb, *skb_tmp;
363 unsigned long flags;
364
365 spin_lock_irqsave(&port->tx_skbs.lock, flags);
366 skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
367 if time_after(LAN966X_SKB_CB(skb)->jiffies + LAN966X_PTP_TIMEOUT,
368 jiffies)
369 break;
370
371 __skb_unlink(skb, &port->tx_skbs);
372 dev_kfree_skb_any(skb);
373 }
374 spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
375}
376
377int lan966x_ptp_txtstamp_request(struct lan966x_port *port,
378 struct sk_buff *skb)
379{
380 struct lan966x *lan966x = port->lan966x;
381 unsigned long flags;
382 u8 rew_op;
383
384 rew_op = lan966x_ptp_classify(port, skb);
385 LAN966X_SKB_CB(skb)->rew_op = rew_op;
386
387 if (rew_op != IFH_REW_OP_TWO_STEP_PTP)
388 return 0;
389
390 lan966x_ptp_txtstamp_old_release(port);
391
392 spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
393 if (lan966x->ptp_skbs == LAN966X_MAX_PTP_ID) {
394 spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
395 return -EBUSY;
396 }
397
398 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
399
400 skb_queue_tail(&port->tx_skbs, skb);
401 LAN966X_SKB_CB(skb)->ts_id = port->ts_id;
402 LAN966X_SKB_CB(skb)->jiffies = jiffies;
403
404 lan966x->ptp_skbs++;
405 port->ts_id++;
406 if (port->ts_id == LAN966X_MAX_PTP_ID)
407 port->ts_id = 0;
408
409 spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
410
411 return 0;
412}
413
414void lan966x_ptp_txtstamp_release(struct lan966x_port *port,
415 struct sk_buff *skb)
416{
417 struct lan966x *lan966x = port->lan966x;
418 unsigned long flags;
419
420 spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
421 port->ts_id--;
422 lan966x->ptp_skbs--;
423 skb_unlink(skb, &port->tx_skbs);
424 spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
425}
426
427static void lan966x_get_hwtimestamp(struct lan966x *lan966x,
428 struct timespec64 *ts,
429 u32 nsec)
430{
431 /* Read current PTP time to get seconds */
432 unsigned long flags;
433 u32 curr_nsec;
434
435 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
436
437 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
438 PTP_PIN_CFG_PIN_DOM_SET(LAN966X_PHC_PORT) |
439 PTP_PIN_CFG_PIN_SYNC_SET(0),
440 PTP_PIN_CFG_PIN_ACTION |
441 PTP_PIN_CFG_PIN_DOM |
442 PTP_PIN_CFG_PIN_SYNC,
443 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
444
445 ts->tv_sec = lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
446 curr_nsec = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
447
448 ts->tv_nsec = nsec;
449
450 /* Sec has incremented since the ts was registered */
451 if (curr_nsec < nsec)
452 ts->tv_sec--;
453
454 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
455}
456
457irqreturn_t lan966x_ptp_irq_handler(int irq, void *args)
458{
459 int budget = LAN966X_MAX_PTP_ID;
460 struct lan966x *lan966x = args;
461
462 while (budget--) {
463 struct sk_buff *skb, *skb_tmp, *skb_match = NULL;
464 struct skb_shared_hwtstamps shhwtstamps;
465 struct lan966x_port *port;
466 struct timespec64 ts;
467 unsigned long flags;
468 u32 val, id, txport;
469 u32 delay;
470
471 val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
472
473 /* Check if a timestamp can be retrieved */
474 if (!(val & PTP_TWOSTEP_CTRL_VLD))
475 break;
476
477 WARN_ON(val & PTP_TWOSTEP_CTRL_OVFL);
478
479 if (!(val & PTP_TWOSTEP_CTRL_STAMP_TX))
480 continue;
481
482 /* Retrieve the ts Tx port */
483 txport = PTP_TWOSTEP_CTRL_STAMP_PORT_GET(val);
484
485 /* Retrieve its associated skb */
486 port = lan966x->ports[txport];
487
488 /* Retrieve the delay */
489 delay = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
490 delay = PTP_TWOSTEP_STAMP_STAMP_NSEC_GET(delay);
491
492 /* Get next timestamp from fifo, which needs to be the
493 * rx timestamp which represents the id of the frame
494 */
495 lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
496 PTP_TWOSTEP_CTRL_NXT,
497 lan966x, PTP_TWOSTEP_CTRL);
498
499 val = lan_rd(lan966x, PTP_TWOSTEP_CTRL);
500
501 /* Check if a timestamp can be retried */
502 if (!(val & PTP_TWOSTEP_CTRL_VLD))
503 break;
504
505 /* Read RX timestamping to get the ID */
506 id = lan_rd(lan966x, PTP_TWOSTEP_STAMP);
507
508 spin_lock_irqsave(&port->tx_skbs.lock, flags);
509 skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
510 if (LAN966X_SKB_CB(skb)->ts_id != id)
511 continue;
512
513 __skb_unlink(skb, &port->tx_skbs);
514 skb_match = skb;
515 break;
516 }
517 spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
518
519 /* Next ts */
520 lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1),
521 PTP_TWOSTEP_CTRL_NXT,
522 lan966x, PTP_TWOSTEP_CTRL);
523
524 if (WARN_ON(!skb_match))
525 continue;
526
527 spin_lock(&lan966x->ptp_ts_id_lock);
528 lan966x->ptp_skbs--;
529 spin_unlock(&lan966x->ptp_ts_id_lock);
530
531 /* Get the h/w timestamp */
532 lan966x_get_hwtimestamp(lan966x, &ts, delay);
533
534 /* Set the timestamp into the skb */
535 shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
536 skb_tstamp_tx(skb_match, &shhwtstamps);
537
538 dev_kfree_skb_any(skb_match);
539 }
540
541 return IRQ_HANDLED;
542}
543
544irqreturn_t lan966x_ptp_ext_irq_handler(int irq, void *args)
545{
546 struct lan966x *lan966x = args;
547 struct lan966x_phc *phc;
548 unsigned long flags;
549 u64 time = 0;
550 time64_t s;
551 int pin, i;
552 s64 ns;
553
554 if (!(lan_rd(lan966x, PTP_PIN_INTR)))
555 return IRQ_NONE;
556
557 /* Go through all domains and see which pin generated the interrupt */
558 for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
559 struct ptp_clock_event ptp_event = {0};
560
561 phc = &lan966x->phc[i];
562 pin = ptp_find_pin_unlocked(phc->clock, PTP_PF_EXTTS, 0);
563 if (pin == -1)
564 continue;
565
566 if (!(lan_rd(lan966x, PTP_PIN_INTR) & BIT(pin)))
567 continue;
568
569 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
570
571 /* Enable to get the new interrupt.
572 * By writing 1 it clears the bit
573 */
574 lan_wr(BIT(pin), lan966x, PTP_PIN_INTR);
575
576 /* Get current time */
577 s = lan_rd(lan966x, PTP_TOD_SEC_MSB(pin));
578 s <<= 32;
579 s |= lan_rd(lan966x, PTP_TOD_SEC_LSB(pin));
580 ns = lan_rd(lan966x, PTP_TOD_NSEC(pin));
581 ns &= PTP_TOD_NSEC_TOD_NSEC;
582
583 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
584
585 if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
586 s--;
587 ns &= 0xf;
588 ns += 999999984;
589 }
590 time = ktime_set(s, ns);
591
592 ptp_event.index = pin;
593 ptp_event.timestamp = time;
594 ptp_event.type = PTP_CLOCK_EXTTS;
595 ptp_clock_event(phc->clock, &ptp_event);
596 }
597
598 return IRQ_HANDLED;
599}
600
601static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
602{
603 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
604 struct lan966x *lan966x = phc->lan966x;
605 unsigned long flags;
606 bool neg_adj = 0;
607 u64 tod_inc;
608 u64 ref;
609
610 if (!scaled_ppm)
611 return 0;
612
613 if (scaled_ppm < 0) {
614 neg_adj = 1;
615 scaled_ppm = -scaled_ppm;
616 }
617
618 tod_inc = lan966x_ptp_get_nominal_value();
619
620 /* The multiplication is split in 2 separate additions because of
621 * overflow issues. If scaled_ppm with 16bit fractional part was bigger
622 * than 20ppm then we got overflow.
623 */
624 ref = LAN966X_1PPM_FORMAT * (scaled_ppm >> 16);
625 ref += (LAN966X_1PPM_FORMAT * (0xffff & scaled_ppm)) >> 16;
626 tod_inc = neg_adj ? tod_inc - ref : tod_inc + ref;
627
628 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
629
630 lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(1 << BIT(phc->index)),
631 PTP_DOM_CFG_CLKCFG_DIS,
632 lan966x, PTP_DOM_CFG);
633
634 lan_wr((u32)tod_inc & 0xFFFFFFFF, lan966x,
635 PTP_CLK_PER_CFG(phc->index, 0));
636 lan_wr((u32)(tod_inc >> 32), lan966x,
637 PTP_CLK_PER_CFG(phc->index, 1));
638
639 lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
640 PTP_DOM_CFG_CLKCFG_DIS,
641 lan966x, PTP_DOM_CFG);
642
643 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
644
645 return 0;
646}
647
648static int lan966x_ptp_settime64(struct ptp_clock_info *ptp,
649 const struct timespec64 *ts)
650{
651 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
652 struct lan966x *lan966x = phc->lan966x;
653 unsigned long flags;
654
655 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
656
657 /* Must be in IDLE mode before the time can be loaded */
658 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
659 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
660 PTP_PIN_CFG_PIN_SYNC_SET(0),
661 PTP_PIN_CFG_PIN_ACTION |
662 PTP_PIN_CFG_PIN_DOM |
663 PTP_PIN_CFG_PIN_SYNC,
664 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
665
666 /* Set new value */
667 lan_wr(PTP_TOD_SEC_MSB_TOD_SEC_MSB_SET(upper_32_bits(ts->tv_sec)),
668 lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
669 lan_wr(lower_32_bits(ts->tv_sec),
670 lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
671 lan_wr(ts->tv_nsec, lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
672
673 /* Apply new values */
674 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_LOAD) |
675 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
676 PTP_PIN_CFG_PIN_SYNC_SET(0),
677 PTP_PIN_CFG_PIN_ACTION |
678 PTP_PIN_CFG_PIN_DOM |
679 PTP_PIN_CFG_PIN_SYNC,
680 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
681
682 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
683
684 return 0;
685}
686
687int lan966x_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
688{
689 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
690 struct lan966x *lan966x = phc->lan966x;
691 unsigned long flags;
692 time64_t s;
693 s64 ns;
694
695 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
696
697 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
698 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
699 PTP_PIN_CFG_PIN_SYNC_SET(0),
700 PTP_PIN_CFG_PIN_ACTION |
701 PTP_PIN_CFG_PIN_DOM |
702 PTP_PIN_CFG_PIN_SYNC,
703 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
704
705 s = lan_rd(lan966x, PTP_TOD_SEC_MSB(TOD_ACC_PIN));
706 s <<= 32;
707 s |= lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN));
708 ns = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
709 ns &= PTP_TOD_NSEC_TOD_NSEC;
710
711 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
712
713 /* Deal with negative values */
714 if ((ns & 0xFFFFFFF0) == 0x3FFFFFF0) {
715 s--;
716 ns &= 0xf;
717 ns += 999999984;
718 }
719
720 set_normalized_timespec64(ts, s, ns);
721 return 0;
722}
723
724static int lan966x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
725{
726 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
727 struct lan966x *lan966x = phc->lan966x;
728
729 if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
730 unsigned long flags;
731
732 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
733
734 /* Must be in IDLE mode before the time can be loaded */
735 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
736 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
737 PTP_PIN_CFG_PIN_SYNC_SET(0),
738 PTP_PIN_CFG_PIN_ACTION |
739 PTP_PIN_CFG_PIN_DOM |
740 PTP_PIN_CFG_PIN_SYNC,
741 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
742
743 lan_wr(PTP_TOD_NSEC_TOD_NSEC_SET(delta),
744 lan966x, PTP_TOD_NSEC(TOD_ACC_PIN));
745
746 /* Adjust time with the value of PTP_TOD_NSEC */
747 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_DELTA) |
748 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
749 PTP_PIN_CFG_PIN_SYNC_SET(0),
750 PTP_PIN_CFG_PIN_ACTION |
751 PTP_PIN_CFG_PIN_DOM |
752 PTP_PIN_CFG_PIN_SYNC,
753 lan966x, PTP_PIN_CFG(TOD_ACC_PIN));
754
755 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
756 } else {
757 /* Fall back using lan966x_ptp_settime64 which is not exact */
758 struct timespec64 ts;
759 u64 now;
760
761 lan966x_ptp_gettime64(ptp, &ts);
762
763 now = ktime_to_ns(timespec64_to_ktime(ts));
764 ts = ns_to_timespec64(now + delta);
765
766 lan966x_ptp_settime64(ptp, &ts);
767 }
768
769 return 0;
770}
771
772static int lan966x_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
773 enum ptp_pin_function func, unsigned int chan)
774{
775 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
776 struct lan966x *lan966x = phc->lan966x;
777 struct ptp_clock_info *info;
778 int i;
779
780 /* Currently support only 1 channel */
781 if (chan != 0)
782 return -1;
783
784 switch (func) {
785 case PTP_PF_NONE:
786 case PTP_PF_PEROUT:
787 case PTP_PF_EXTTS:
788 break;
789 default:
790 return -1;
791 }
792
793 /* The PTP pins are shared by all the PHC. So it is required to see if
794 * the pin is connected to another PHC. The pin is connected to another
795 * PHC if that pin already has a function on that PHC.
796 */
797 for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
798 info = &lan966x->phc[i].info;
799
800 /* Ignore the check with ourself */
801 if (ptp == info)
802 continue;
803
804 if (info->pin_config[pin].func == PTP_PF_PEROUT ||
805 info->pin_config[pin].func == PTP_PF_EXTTS)
806 return -1;
807 }
808
809 return 0;
810}
811
812static int lan966x_ptp_perout(struct ptp_clock_info *ptp,
813 struct ptp_clock_request *rq, int on)
814{
815 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
816 struct lan966x *lan966x = phc->lan966x;
817 struct timespec64 ts_phase, ts_period;
818 unsigned long flags;
819 s64 wf_high, wf_low;
820 bool pps = false;
821 int pin;
822
823 if (rq->perout.flags & ~(PTP_PEROUT_DUTY_CYCLE |
824 PTP_PEROUT_PHASE))
825 return -EOPNOTSUPP;
826
827 pin = ptp_find_pin(phc->clock, PTP_PF_PEROUT, rq->perout.index);
828 if (pin == -1 || pin >= LAN966X_PHC_PINS_NUM)
829 return -EINVAL;
830
831 if (!on) {
832 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
833 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_IDLE) |
834 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
835 PTP_PIN_CFG_PIN_SYNC_SET(0),
836 PTP_PIN_CFG_PIN_ACTION |
837 PTP_PIN_CFG_PIN_DOM |
838 PTP_PIN_CFG_PIN_SYNC,
839 lan966x, PTP_PIN_CFG(pin));
840 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
841 return 0;
842 }
843
844 if (rq->perout.period.sec == 1 &&
845 rq->perout.period.nsec == 0)
846 pps = true;
847
848 if (rq->perout.flags & PTP_PEROUT_PHASE) {
849 ts_phase.tv_sec = rq->perout.phase.sec;
850 ts_phase.tv_nsec = rq->perout.phase.nsec;
851 } else {
852 ts_phase.tv_sec = rq->perout.start.sec;
853 ts_phase.tv_nsec = rq->perout.start.nsec;
854 }
855
856 if (ts_phase.tv_sec || (ts_phase.tv_nsec && !pps)) {
857 dev_warn(lan966x->dev,
858 "Absolute time not supported!\n");
859 return -EINVAL;
860 }
861
862 if (rq->perout.flags & PTP_PEROUT_DUTY_CYCLE) {
863 struct timespec64 ts_on;
864
865 ts_on.tv_sec = rq->perout.on.sec;
866 ts_on.tv_nsec = rq->perout.on.nsec;
867
868 wf_high = timespec64_to_ns(&ts_on);
869 } else {
870 wf_high = 5000;
871 }
872
873 if (pps) {
874 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
875 lan_wr(PTP_WF_LOW_PERIOD_PIN_WFL(ts_phase.tv_nsec),
876 lan966x, PTP_WF_LOW_PERIOD(pin));
877 lan_wr(PTP_WF_HIGH_PERIOD_PIN_WFH(wf_high),
878 lan966x, PTP_WF_HIGH_PERIOD(pin));
879 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_CLOCK) |
880 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
881 PTP_PIN_CFG_PIN_SYNC_SET(3),
882 PTP_PIN_CFG_PIN_ACTION |
883 PTP_PIN_CFG_PIN_DOM |
884 PTP_PIN_CFG_PIN_SYNC,
885 lan966x, PTP_PIN_CFG(pin));
886 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
887 return 0;
888 }
889
890 ts_period.tv_sec = rq->perout.period.sec;
891 ts_period.tv_nsec = rq->perout.period.nsec;
892
893 wf_low = timespec64_to_ns(&ts_period);
894 wf_low -= wf_high;
895
896 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
897 lan_wr(PTP_WF_LOW_PERIOD_PIN_WFL(wf_low),
898 lan966x, PTP_WF_LOW_PERIOD(pin));
899 lan_wr(PTP_WF_HIGH_PERIOD_PIN_WFH(wf_high),
900 lan966x, PTP_WF_HIGH_PERIOD(pin));
901 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_CLOCK) |
902 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
903 PTP_PIN_CFG_PIN_SYNC_SET(0),
904 PTP_PIN_CFG_PIN_ACTION |
905 PTP_PIN_CFG_PIN_DOM |
906 PTP_PIN_CFG_PIN_SYNC,
907 lan966x, PTP_PIN_CFG(pin));
908 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
909
910 return 0;
911}
912
913static int lan966x_ptp_extts(struct ptp_clock_info *ptp,
914 struct ptp_clock_request *rq, int on)
915{
916 struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
917 struct lan966x *lan966x = phc->lan966x;
918 unsigned long flags;
919 int pin;
920 u32 val;
921
922 if (lan966x->ptp_ext_irq <= 0)
923 return -EOPNOTSUPP;
924
925 /* Reject requests with unsupported flags */
926 if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
927 PTP_RISING_EDGE |
928 PTP_STRICT_FLAGS))
929 return -EOPNOTSUPP;
930
931 pin = ptp_find_pin(phc->clock, PTP_PF_EXTTS, rq->extts.index);
932 if (pin == -1 || pin >= LAN966X_PHC_PINS_NUM)
933 return -EINVAL;
934
935 spin_lock_irqsave(&lan966x->ptp_clock_lock, flags);
936 lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) |
937 PTP_PIN_CFG_PIN_SYNC_SET(on ? 3 : 0) |
938 PTP_PIN_CFG_PIN_DOM_SET(phc->index) |
939 PTP_PIN_CFG_PIN_SELECT_SET(pin),
940 PTP_PIN_CFG_PIN_ACTION |
941 PTP_PIN_CFG_PIN_SYNC |
942 PTP_PIN_CFG_PIN_DOM |
943 PTP_PIN_CFG_PIN_SELECT,
944 lan966x, PTP_PIN_CFG(pin));
945
946 val = lan_rd(lan966x, PTP_PIN_INTR_ENA);
947 if (on)
948 val |= BIT(pin);
949 else
950 val &= ~BIT(pin);
951 lan_wr(val, lan966x, PTP_PIN_INTR_ENA);
952
953 spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags);
954
955 return 0;
956}
957
958static int lan966x_ptp_enable(struct ptp_clock_info *ptp,
959 struct ptp_clock_request *rq, int on)
960{
961 switch (rq->type) {
962 case PTP_CLK_REQ_PEROUT:
963 return lan966x_ptp_perout(ptp, rq, on);
964 case PTP_CLK_REQ_EXTTS:
965 return lan966x_ptp_extts(ptp, rq, on);
966 default:
967 return -EOPNOTSUPP;
968 }
969
970 return 0;
971}
972
973static struct ptp_clock_info lan966x_ptp_clock_info = {
974 .owner = THIS_MODULE,
975 .name = "lan966x ptp",
976 .max_adj = 200000,
977 .gettime64 = lan966x_ptp_gettime64,
978 .settime64 = lan966x_ptp_settime64,
979 .adjtime = lan966x_ptp_adjtime,
980 .adjfine = lan966x_ptp_adjfine,
981 .verify = lan966x_ptp_verify,
982 .enable = lan966x_ptp_enable,
983 .n_per_out = LAN966X_PHC_PINS_NUM,
984 .n_ext_ts = LAN966X_PHC_PINS_NUM,
985 .n_pins = LAN966X_PHC_PINS_NUM,
986};
987
988static int lan966x_ptp_phc_init(struct lan966x *lan966x,
989 int index,
990 struct ptp_clock_info *clock_info)
991{
992 struct lan966x_phc *phc = &lan966x->phc[index];
993 struct ptp_pin_desc *p;
994 int i;
995
996 for (i = 0; i < LAN966X_PHC_PINS_NUM; i++) {
997 p = &phc->pins[i];
998
999 snprintf(p->name, sizeof(p->name), "pin%d", i);
1000 p->index = i;
1001 p->func = PTP_PF_NONE;
1002 }
1003
1004 phc->info = *clock_info;
1005 phc->info.pin_config = &phc->pins[0];
1006 phc->clock = ptp_clock_register(&phc->info, lan966x->dev);
1007 if (IS_ERR(phc->clock))
1008 return PTR_ERR(phc->clock);
1009
1010 phc->index = index;
1011 phc->lan966x = lan966x;
1012
1013 /* PTP Rx stamping is always enabled. */
1014 phc->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
1015
1016 return 0;
1017}
1018
1019int lan966x_ptp_init(struct lan966x *lan966x)
1020{
1021 u64 tod_adj = lan966x_ptp_get_nominal_value();
1022 struct lan966x_port *port;
1023 int err, i;
1024
1025 if (!lan966x->ptp)
1026 return 0;
1027
1028 for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
1029 err = lan966x_ptp_phc_init(lan966x, i, &lan966x_ptp_clock_info);
1030 if (err)
1031 return err;
1032 }
1033
1034 spin_lock_init(&lan966x->ptp_clock_lock);
1035 spin_lock_init(&lan966x->ptp_ts_id_lock);
1036 mutex_init(&lan966x->ptp_lock);
1037
1038 /* Disable master counters */
1039 lan_wr(PTP_DOM_CFG_ENA_SET(0), lan966x, PTP_DOM_CFG);
1040
1041 /* Configure the nominal TOD increment per clock cycle */
1042 lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0x7),
1043 PTP_DOM_CFG_CLKCFG_DIS,
1044 lan966x, PTP_DOM_CFG);
1045
1046 for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
1047 lan_wr((u32)tod_adj & 0xFFFFFFFF, lan966x,
1048 PTP_CLK_PER_CFG(i, 0));
1049 lan_wr((u32)(tod_adj >> 32), lan966x,
1050 PTP_CLK_PER_CFG(i, 1));
1051 }
1052
1053 lan_rmw(PTP_DOM_CFG_CLKCFG_DIS_SET(0),
1054 PTP_DOM_CFG_CLKCFG_DIS,
1055 lan966x, PTP_DOM_CFG);
1056
1057 /* Enable master counters */
1058 lan_wr(PTP_DOM_CFG_ENA_SET(0x7), lan966x, PTP_DOM_CFG);
1059
1060 for (i = 0; i < lan966x->num_phys_ports; i++) {
1061 port = lan966x->ports[i];
1062 if (!port)
1063 continue;
1064
1065 skb_queue_head_init(&port->tx_skbs);
1066 }
1067
1068 return 0;
1069}
1070
1071void lan966x_ptp_deinit(struct lan966x *lan966x)
1072{
1073 struct lan966x_port *port;
1074 int i;
1075
1076 if (!lan966x->ptp)
1077 return;
1078
1079 for (i = 0; i < lan966x->num_phys_ports; i++) {
1080 port = lan966x->ports[i];
1081 if (!port)
1082 continue;
1083
1084 skb_queue_purge(&port->tx_skbs);
1085 }
1086
1087 for (i = 0; i < LAN966X_PHC_COUNT; ++i)
1088 ptp_clock_unregister(lan966x->phc[i].clock);
1089}
1090
1091void lan966x_ptp_rxtstamp(struct lan966x *lan966x, struct sk_buff *skb,
1092 u64 timestamp)
1093{
1094 struct skb_shared_hwtstamps *shhwtstamps;
1095 struct lan966x_phc *phc;
1096 struct timespec64 ts;
1097 u64 full_ts_in_ns;
1098
1099 if (!lan966x->ptp)
1100 return;
1101
1102 phc = &lan966x->phc[LAN966X_PHC_PORT];
1103 lan966x_ptp_gettime64(&phc->info, &ts);
1104
1105 /* Drop the sub-ns precision */
1106 timestamp = timestamp >> 2;
1107 if (ts.tv_nsec < timestamp)
1108 ts.tv_sec--;
1109 ts.tv_nsec = timestamp;
1110 full_ts_in_ns = ktime_set(ts.tv_sec, ts.tv_nsec);
1111
1112 shhwtstamps = skb_hwtstamps(skb);
1113 shhwtstamps->hwtstamp = full_ts_in_ns;
1114}
1115
1116u32 lan966x_ptp_get_period_ps(void)
1117{
1118 /* This represents the system clock period in picoseconds */
1119 return 15125;
1120}