1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019 Intel Corporation */
3
4 #include "igc.h"
5
6 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/pci.h>
9 #include <linux/ptp_classify.h>
10 #include <linux/clocksource.h>
11 #include <linux/ktime.h>
12 #include <linux/delay.h>
13 #include <linux/iopoll.h>
14 #include <net/xdp_sock_drv.h>
15
16 #define INCVALUE_MASK 0x7fffffff
17 #define ISGN 0x80000000
18
19 #define IGC_PTP_TX_TIMEOUT (HZ * 15)
20
21 #define IGC_PTM_STAT_SLEEP 2
22 #define IGC_PTM_STAT_TIMEOUT 100
23
24 /* SYSTIM read access for I225 */
igc_ptp_read(struct igc_adapter * adapter,struct timespec64 * ts)25 void igc_ptp_read(struct igc_adapter *adapter, struct timespec64 *ts)
26 {
27 struct igc_hw *hw = &adapter->hw;
28 u32 sec, nsec;
29
30 /* The timestamp is latched when SYSTIML is read. */
31 nsec = rd32(IGC_SYSTIML);
32 sec = rd32(IGC_SYSTIMH);
33
34 ts->tv_sec = sec;
35 ts->tv_nsec = nsec;
36 }
37
igc_ptp_write_i225(struct igc_adapter * adapter,const struct timespec64 * ts)38 static void igc_ptp_write_i225(struct igc_adapter *adapter,
39 const struct timespec64 *ts)
40 {
41 struct igc_hw *hw = &adapter->hw;
42
43 wr32(IGC_SYSTIML, ts->tv_nsec);
44 wr32(IGC_SYSTIMH, ts->tv_sec);
45 }
46
igc_ptp_adjfine_i225(struct ptp_clock_info * ptp,long scaled_ppm)47 static int igc_ptp_adjfine_i225(struct ptp_clock_info *ptp, long scaled_ppm)
48 {
49 struct igc_adapter *igc = container_of(ptp, struct igc_adapter,
50 ptp_caps);
51 struct igc_hw *hw = &igc->hw;
52 int neg_adj = 0;
53 u64 rate;
54 u32 inca;
55
56 if (scaled_ppm < 0) {
57 neg_adj = 1;
58 scaled_ppm = -scaled_ppm;
59 }
60 rate = scaled_ppm;
61 rate <<= 14;
62 rate = div_u64(rate, 78125);
63
64 inca = rate & INCVALUE_MASK;
65 if (neg_adj)
66 inca |= ISGN;
67
68 wr32(IGC_TIMINCA, inca);
69
70 return 0;
71 }
72
igc_ptp_adjtime_i225(struct ptp_clock_info * ptp,s64 delta)73 static int igc_ptp_adjtime_i225(struct ptp_clock_info *ptp, s64 delta)
74 {
75 struct igc_adapter *igc = container_of(ptp, struct igc_adapter,
76 ptp_caps);
77 struct timespec64 now, then = ns_to_timespec64(delta);
78 unsigned long flags;
79
80 spin_lock_irqsave(&igc->tmreg_lock, flags);
81
82 igc_ptp_read(igc, &now);
83 now = timespec64_add(now, then);
84 igc_ptp_write_i225(igc, (const struct timespec64 *)&now);
85
86 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
87
88 return 0;
89 }
90
igc_ptp_gettimex64_i225(struct ptp_clock_info * ptp,struct timespec64 * ts,struct ptp_system_timestamp * sts)91 static int igc_ptp_gettimex64_i225(struct ptp_clock_info *ptp,
92 struct timespec64 *ts,
93 struct ptp_system_timestamp *sts)
94 {
95 struct igc_adapter *igc = container_of(ptp, struct igc_adapter,
96 ptp_caps);
97 struct igc_hw *hw = &igc->hw;
98 unsigned long flags;
99
100 spin_lock_irqsave(&igc->tmreg_lock, flags);
101
102 ptp_read_system_prets(sts);
103 ts->tv_nsec = rd32(IGC_SYSTIML);
104 ts->tv_sec = rd32(IGC_SYSTIMH);
105 ptp_read_system_postts(sts);
106
107 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
108
109 return 0;
110 }
111
igc_ptp_settime_i225(struct ptp_clock_info * ptp,const struct timespec64 * ts)112 static int igc_ptp_settime_i225(struct ptp_clock_info *ptp,
113 const struct timespec64 *ts)
114 {
115 struct igc_adapter *igc = container_of(ptp, struct igc_adapter,
116 ptp_caps);
117 unsigned long flags;
118
119 spin_lock_irqsave(&igc->tmreg_lock, flags);
120
121 igc_ptp_write_i225(igc, ts);
122
123 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
124
125 return 0;
126 }
127
igc_pin_direction(int pin,int input,u32 * ctrl,u32 * ctrl_ext)128 static void igc_pin_direction(int pin, int input, u32 *ctrl, u32 *ctrl_ext)
129 {
130 u32 *ptr = pin < 2 ? ctrl : ctrl_ext;
131 static const u32 mask[IGC_N_SDP] = {
132 IGC_CTRL_SDP0_DIR,
133 IGC_CTRL_SDP1_DIR,
134 IGC_CTRL_EXT_SDP2_DIR,
135 IGC_CTRL_EXT_SDP3_DIR,
136 };
137
138 if (input)
139 *ptr &= ~mask[pin];
140 else
141 *ptr |= mask[pin];
142 }
143
igc_pin_perout(struct igc_adapter * igc,int chan,int pin,int freq)144 static void igc_pin_perout(struct igc_adapter *igc, int chan, int pin, int freq)
145 {
146 static const u32 igc_aux0_sel_sdp[IGC_N_SDP] = {
147 IGC_AUX0_SEL_SDP0, IGC_AUX0_SEL_SDP1, IGC_AUX0_SEL_SDP2, IGC_AUX0_SEL_SDP3,
148 };
149 static const u32 igc_aux1_sel_sdp[IGC_N_SDP] = {
150 IGC_AUX1_SEL_SDP0, IGC_AUX1_SEL_SDP1, IGC_AUX1_SEL_SDP2, IGC_AUX1_SEL_SDP3,
151 };
152 static const u32 igc_ts_sdp_en[IGC_N_SDP] = {
153 IGC_TS_SDP0_EN, IGC_TS_SDP1_EN, IGC_TS_SDP2_EN, IGC_TS_SDP3_EN,
154 };
155 static const u32 igc_ts_sdp_sel_tt0[IGC_N_SDP] = {
156 IGC_TS_SDP0_SEL_TT0, IGC_TS_SDP1_SEL_TT0,
157 IGC_TS_SDP2_SEL_TT0, IGC_TS_SDP3_SEL_TT0,
158 };
159 static const u32 igc_ts_sdp_sel_tt1[IGC_N_SDP] = {
160 IGC_TS_SDP0_SEL_TT1, IGC_TS_SDP1_SEL_TT1,
161 IGC_TS_SDP2_SEL_TT1, IGC_TS_SDP3_SEL_TT1,
162 };
163 static const u32 igc_ts_sdp_sel_fc0[IGC_N_SDP] = {
164 IGC_TS_SDP0_SEL_FC0, IGC_TS_SDP1_SEL_FC0,
165 IGC_TS_SDP2_SEL_FC0, IGC_TS_SDP3_SEL_FC0,
166 };
167 static const u32 igc_ts_sdp_sel_fc1[IGC_N_SDP] = {
168 IGC_TS_SDP0_SEL_FC1, IGC_TS_SDP1_SEL_FC1,
169 IGC_TS_SDP2_SEL_FC1, IGC_TS_SDP3_SEL_FC1,
170 };
171 static const u32 igc_ts_sdp_sel_clr[IGC_N_SDP] = {
172 IGC_TS_SDP0_SEL_FC1, IGC_TS_SDP1_SEL_FC1,
173 IGC_TS_SDP2_SEL_FC1, IGC_TS_SDP3_SEL_FC1,
174 };
175 struct igc_hw *hw = &igc->hw;
176 u32 ctrl, ctrl_ext, tssdp = 0;
177
178 ctrl = rd32(IGC_CTRL);
179 ctrl_ext = rd32(IGC_CTRL_EXT);
180 tssdp = rd32(IGC_TSSDP);
181
182 igc_pin_direction(pin, 0, &ctrl, &ctrl_ext);
183
184 /* Make sure this pin is not enabled as an input. */
185 if ((tssdp & IGC_AUX0_SEL_SDP3) == igc_aux0_sel_sdp[pin])
186 tssdp &= ~IGC_AUX0_TS_SDP_EN;
187
188 if ((tssdp & IGC_AUX1_SEL_SDP3) == igc_aux1_sel_sdp[pin])
189 tssdp &= ~IGC_AUX1_TS_SDP_EN;
190
191 tssdp &= ~igc_ts_sdp_sel_clr[pin];
192 if (freq) {
193 if (chan == 1)
194 tssdp |= igc_ts_sdp_sel_fc1[pin];
195 else
196 tssdp |= igc_ts_sdp_sel_fc0[pin];
197 } else {
198 if (chan == 1)
199 tssdp |= igc_ts_sdp_sel_tt1[pin];
200 else
201 tssdp |= igc_ts_sdp_sel_tt0[pin];
202 }
203 tssdp |= igc_ts_sdp_en[pin];
204
205 wr32(IGC_TSSDP, tssdp);
206 wr32(IGC_CTRL, ctrl);
207 wr32(IGC_CTRL_EXT, ctrl_ext);
208 }
209
igc_pin_extts(struct igc_adapter * igc,int chan,int pin)210 static void igc_pin_extts(struct igc_adapter *igc, int chan, int pin)
211 {
212 static const u32 igc_aux0_sel_sdp[IGC_N_SDP] = {
213 IGC_AUX0_SEL_SDP0, IGC_AUX0_SEL_SDP1, IGC_AUX0_SEL_SDP2, IGC_AUX0_SEL_SDP3,
214 };
215 static const u32 igc_aux1_sel_sdp[IGC_N_SDP] = {
216 IGC_AUX1_SEL_SDP0, IGC_AUX1_SEL_SDP1, IGC_AUX1_SEL_SDP2, IGC_AUX1_SEL_SDP3,
217 };
218 static const u32 igc_ts_sdp_en[IGC_N_SDP] = {
219 IGC_TS_SDP0_EN, IGC_TS_SDP1_EN, IGC_TS_SDP2_EN, IGC_TS_SDP3_EN,
220 };
221 struct igc_hw *hw = &igc->hw;
222 u32 ctrl, ctrl_ext, tssdp = 0;
223
224 ctrl = rd32(IGC_CTRL);
225 ctrl_ext = rd32(IGC_CTRL_EXT);
226 tssdp = rd32(IGC_TSSDP);
227
228 igc_pin_direction(pin, 1, &ctrl, &ctrl_ext);
229
230 /* Make sure this pin is not enabled as an output. */
231 tssdp &= ~igc_ts_sdp_en[pin];
232
233 if (chan == 1) {
234 tssdp &= ~IGC_AUX1_SEL_SDP3;
235 tssdp |= igc_aux1_sel_sdp[pin] | IGC_AUX1_TS_SDP_EN;
236 } else {
237 tssdp &= ~IGC_AUX0_SEL_SDP3;
238 tssdp |= igc_aux0_sel_sdp[pin] | IGC_AUX0_TS_SDP_EN;
239 }
240
241 wr32(IGC_TSSDP, tssdp);
242 wr32(IGC_CTRL, ctrl);
243 wr32(IGC_CTRL_EXT, ctrl_ext);
244 }
245
igc_ptp_feature_enable_i225(struct ptp_clock_info * ptp,struct ptp_clock_request * rq,int on)246 static int igc_ptp_feature_enable_i225(struct ptp_clock_info *ptp,
247 struct ptp_clock_request *rq, int on)
248 {
249 struct igc_adapter *igc =
250 container_of(ptp, struct igc_adapter, ptp_caps);
251 struct igc_hw *hw = &igc->hw;
252 unsigned long flags;
253 struct timespec64 ts;
254 int use_freq = 0, pin = -1;
255 u32 tsim, tsauxc, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout;
256 s64 ns;
257
258 switch (rq->type) {
259 case PTP_CLK_REQ_EXTTS:
260 /* Reject requests with unsupported flags */
261 if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
262 PTP_RISING_EDGE |
263 PTP_FALLING_EDGE |
264 PTP_STRICT_FLAGS))
265 return -EOPNOTSUPP;
266
267 /* Reject requests failing to enable both edges. */
268 if ((rq->extts.flags & PTP_STRICT_FLAGS) &&
269 (rq->extts.flags & PTP_ENABLE_FEATURE) &&
270 (rq->extts.flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES)
271 return -EOPNOTSUPP;
272
273 if (on) {
274 pin = ptp_find_pin(igc->ptp_clock, PTP_PF_EXTTS,
275 rq->extts.index);
276 if (pin < 0)
277 return -EBUSY;
278 }
279 if (rq->extts.index == 1) {
280 tsauxc_mask = IGC_TSAUXC_EN_TS1;
281 tsim_mask = IGC_TSICR_AUTT1;
282 } else {
283 tsauxc_mask = IGC_TSAUXC_EN_TS0;
284 tsim_mask = IGC_TSICR_AUTT0;
285 }
286 spin_lock_irqsave(&igc->tmreg_lock, flags);
287 tsauxc = rd32(IGC_TSAUXC);
288 tsim = rd32(IGC_TSIM);
289 if (on) {
290 igc_pin_extts(igc, rq->extts.index, pin);
291 tsauxc |= tsauxc_mask;
292 tsim |= tsim_mask;
293 } else {
294 tsauxc &= ~tsauxc_mask;
295 tsim &= ~tsim_mask;
296 }
297 wr32(IGC_TSAUXC, tsauxc);
298 wr32(IGC_TSIM, tsim);
299 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
300 return 0;
301
302 case PTP_CLK_REQ_PEROUT:
303 /* Reject requests with unsupported flags */
304 if (rq->perout.flags)
305 return -EOPNOTSUPP;
306
307 if (on) {
308 pin = ptp_find_pin(igc->ptp_clock, PTP_PF_PEROUT,
309 rq->perout.index);
310 if (pin < 0)
311 return -EBUSY;
312 }
313 ts.tv_sec = rq->perout.period.sec;
314 ts.tv_nsec = rq->perout.period.nsec;
315 ns = timespec64_to_ns(&ts);
316 ns = ns >> 1;
317 if (on && (ns <= 70000000LL || ns == 125000000LL ||
318 ns == 250000000LL || ns == 500000000LL)) {
319 if (ns < 8LL)
320 return -EINVAL;
321 use_freq = 1;
322 }
323 ts = ns_to_timespec64(ns);
324 if (rq->perout.index == 1) {
325 if (use_freq) {
326 tsauxc_mask = IGC_TSAUXC_EN_CLK1 | IGC_TSAUXC_ST1;
327 tsim_mask = 0;
328 } else {
329 tsauxc_mask = IGC_TSAUXC_EN_TT1;
330 tsim_mask = IGC_TSICR_TT1;
331 }
332 trgttiml = IGC_TRGTTIML1;
333 trgttimh = IGC_TRGTTIMH1;
334 freqout = IGC_FREQOUT1;
335 } else {
336 if (use_freq) {
337 tsauxc_mask = IGC_TSAUXC_EN_CLK0 | IGC_TSAUXC_ST0;
338 tsim_mask = 0;
339 } else {
340 tsauxc_mask = IGC_TSAUXC_EN_TT0;
341 tsim_mask = IGC_TSICR_TT0;
342 }
343 trgttiml = IGC_TRGTTIML0;
344 trgttimh = IGC_TRGTTIMH0;
345 freqout = IGC_FREQOUT0;
346 }
347 spin_lock_irqsave(&igc->tmreg_lock, flags);
348 tsauxc = rd32(IGC_TSAUXC);
349 tsim = rd32(IGC_TSIM);
350 if (rq->perout.index == 1) {
351 tsauxc &= ~(IGC_TSAUXC_EN_TT1 | IGC_TSAUXC_EN_CLK1 |
352 IGC_TSAUXC_ST1);
353 tsim &= ~IGC_TSICR_TT1;
354 } else {
355 tsauxc &= ~(IGC_TSAUXC_EN_TT0 | IGC_TSAUXC_EN_CLK0 |
356 IGC_TSAUXC_ST0);
357 tsim &= ~IGC_TSICR_TT0;
358 }
359 if (on) {
360 struct timespec64 safe_start;
361 int i = rq->perout.index;
362
363 igc_pin_perout(igc, i, pin, use_freq);
364 igc_ptp_read(igc, &safe_start);
365
366 /* PPS output start time is triggered by Target time(TT)
367 * register. Programming any past time value into TT
368 * register will cause PPS to never start. Need to make
369 * sure we program the TT register a time ahead in
370 * future. There isn't a stringent need to fire PPS out
371 * right away. Adding +2 seconds should take care of
372 * corner cases. Let's say if the SYSTIML is close to
373 * wrap up and the timer keeps ticking as we program the
374 * register, adding +2seconds is safe bet.
375 */
376 safe_start.tv_sec += 2;
377
378 if (rq->perout.start.sec < safe_start.tv_sec)
379 igc->perout[i].start.tv_sec = safe_start.tv_sec;
380 else
381 igc->perout[i].start.tv_sec = rq->perout.start.sec;
382 igc->perout[i].start.tv_nsec = rq->perout.start.nsec;
383 igc->perout[i].period.tv_sec = ts.tv_sec;
384 igc->perout[i].period.tv_nsec = ts.tv_nsec;
385 wr32(trgttimh, (u32)igc->perout[i].start.tv_sec);
386 /* For now, always select timer 0 as source. */
387 wr32(trgttiml, (u32)(igc->perout[i].start.tv_nsec |
388 IGC_TT_IO_TIMER_SEL_SYSTIM0));
389 if (use_freq)
390 wr32(freqout, ns);
391 tsauxc |= tsauxc_mask;
392 tsim |= tsim_mask;
393 }
394 wr32(IGC_TSAUXC, tsauxc);
395 wr32(IGC_TSIM, tsim);
396 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
397 return 0;
398
399 case PTP_CLK_REQ_PPS:
400 spin_lock_irqsave(&igc->tmreg_lock, flags);
401 tsim = rd32(IGC_TSIM);
402 if (on)
403 tsim |= IGC_TSICR_SYS_WRAP;
404 else
405 tsim &= ~IGC_TSICR_SYS_WRAP;
406 igc->pps_sys_wrap_on = on;
407 wr32(IGC_TSIM, tsim);
408 spin_unlock_irqrestore(&igc->tmreg_lock, flags);
409 return 0;
410
411 default:
412 break;
413 }
414
415 return -EOPNOTSUPP;
416 }
417
igc_ptp_verify_pin(struct ptp_clock_info * ptp,unsigned int pin,enum ptp_pin_function func,unsigned int chan)418 static int igc_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
419 enum ptp_pin_function func, unsigned int chan)
420 {
421 switch (func) {
422 case PTP_PF_NONE:
423 case PTP_PF_EXTTS:
424 case PTP_PF_PEROUT:
425 break;
426 case PTP_PF_PHYSYNC:
427 return -1;
428 }
429 return 0;
430 }
431
432 /**
433 * igc_ptp_systim_to_hwtstamp - convert system time value to HW timestamp
434 * @adapter: board private structure
435 * @hwtstamps: timestamp structure to update
436 * @systim: unsigned 64bit system time value
437 *
438 * We need to convert the system time value stored in the RX/TXSTMP registers
439 * into a hwtstamp which can be used by the upper level timestamping functions.
440 *
441 * Returns 0 on success.
442 **/
igc_ptp_systim_to_hwtstamp(struct igc_adapter * adapter,struct skb_shared_hwtstamps * hwtstamps,u64 systim)443 static int igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
444 struct skb_shared_hwtstamps *hwtstamps,
445 u64 systim)
446 {
447 switch (adapter->hw.mac.type) {
448 case igc_i225:
449 memset(hwtstamps, 0, sizeof(*hwtstamps));
450 /* Upper 32 bits contain s, lower 32 bits contain ns. */
451 hwtstamps->hwtstamp = ktime_set(systim >> 32,
452 systim & 0xFFFFFFFF);
453 break;
454 default:
455 return -EINVAL;
456 }
457 return 0;
458 }
459
460 /**
461 * igc_ptp_rx_pktstamp - Retrieve timestamp from Rx packet buffer
462 * @adapter: Pointer to adapter the packet buffer belongs to
463 * @buf: Pointer to start of timestamp in HW format (2 32-bit words)
464 *
465 * This function retrieves and converts the timestamp stored at @buf
466 * to ktime_t, adjusting for hardware latencies.
467 *
468 * Returns timestamp value.
469 */
igc_ptp_rx_pktstamp(struct igc_adapter * adapter,__le32 * buf)470 ktime_t igc_ptp_rx_pktstamp(struct igc_adapter *adapter, __le32 *buf)
471 {
472 ktime_t timestamp;
473 u32 secs, nsecs;
474 int adjust;
475
476 nsecs = le32_to_cpu(buf[0]);
477 secs = le32_to_cpu(buf[1]);
478
479 timestamp = ktime_set(secs, nsecs);
480
481 /* Adjust timestamp for the RX latency based on link speed */
482 switch (adapter->link_speed) {
483 case SPEED_10:
484 adjust = IGC_I225_RX_LATENCY_10;
485 break;
486 case SPEED_100:
487 adjust = IGC_I225_RX_LATENCY_100;
488 break;
489 case SPEED_1000:
490 adjust = IGC_I225_RX_LATENCY_1000;
491 break;
492 case SPEED_2500:
493 adjust = IGC_I225_RX_LATENCY_2500;
494 break;
495 default:
496 adjust = 0;
497 netdev_warn_once(adapter->netdev, "Imprecise timestamp\n");
498 break;
499 }
500
501 return ktime_sub_ns(timestamp, adjust);
502 }
503
igc_ptp_disable_rx_timestamp(struct igc_adapter * adapter)504 static void igc_ptp_disable_rx_timestamp(struct igc_adapter *adapter)
505 {
506 struct igc_hw *hw = &adapter->hw;
507 u32 val;
508 int i;
509
510 wr32(IGC_TSYNCRXCTL, 0);
511
512 for (i = 0; i < adapter->num_rx_queues; i++) {
513 val = rd32(IGC_SRRCTL(i));
514 val &= ~IGC_SRRCTL_TIMESTAMP;
515 wr32(IGC_SRRCTL(i), val);
516 }
517
518 val = rd32(IGC_RXPBS);
519 val &= ~IGC_RXPBS_CFG_TS_EN;
520 wr32(IGC_RXPBS, val);
521 }
522
igc_ptp_enable_rx_timestamp(struct igc_adapter * adapter)523 static void igc_ptp_enable_rx_timestamp(struct igc_adapter *adapter)
524 {
525 struct igc_hw *hw = &adapter->hw;
526 u32 val;
527 int i;
528
529 val = rd32(IGC_RXPBS);
530 val |= IGC_RXPBS_CFG_TS_EN;
531 wr32(IGC_RXPBS, val);
532
533 for (i = 0; i < adapter->num_rx_queues; i++) {
534 val = rd32(IGC_SRRCTL(i));
535 /* Enable retrieving timestamps from timer 0, the
536 * "adjustable clock" and timer 1 the "free running
537 * clock".
538 */
539 val |= IGC_SRRCTL_TIMER1SEL(1) | IGC_SRRCTL_TIMER0SEL(0) |
540 IGC_SRRCTL_TIMESTAMP;
541 wr32(IGC_SRRCTL(i), val);
542 }
543
544 val = IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_ALL |
545 IGC_TSYNCRXCTL_RXSYNSIG;
546 wr32(IGC_TSYNCRXCTL, val);
547 }
548
igc_ptp_free_tx_buffer(struct igc_adapter * adapter,struct igc_tx_timestamp_request * tstamp)549 static void igc_ptp_free_tx_buffer(struct igc_adapter *adapter,
550 struct igc_tx_timestamp_request *tstamp)
551 {
552 if (tstamp->buffer_type == IGC_TX_BUFFER_TYPE_XSK) {
553 /* Release the transmit completion */
554 tstamp->xsk_tx_buffer->xsk_pending_ts = false;
555
556 /* Note: tstamp->skb and tstamp->xsk_tx_buffer are in union.
557 * By setting tstamp->xsk_tx_buffer to NULL, tstamp->skb will
558 * become NULL as well.
559 */
560 tstamp->xsk_tx_buffer = NULL;
561 tstamp->buffer_type = 0;
562
563 /* Trigger txrx interrupt for transmit completion */
564 igc_xsk_wakeup(adapter->netdev, tstamp->xsk_queue_index, 0);
565
566 return;
567 }
568
569 dev_kfree_skb_any(tstamp->skb);
570 tstamp->skb = NULL;
571 }
572
igc_ptp_clear_tx_tstamp(struct igc_adapter * adapter)573 static void igc_ptp_clear_tx_tstamp(struct igc_adapter *adapter)
574 {
575 unsigned long flags;
576 int i;
577
578 spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
579
580 for (i = 0; i < IGC_MAX_TX_TSTAMP_REGS; i++) {
581 struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i];
582
583 if (tstamp->skb)
584 igc_ptp_free_tx_buffer(adapter, tstamp);
585 }
586
587 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
588 }
589
igc_ptp_disable_tx_timestamp(struct igc_adapter * adapter)590 static void igc_ptp_disable_tx_timestamp(struct igc_adapter *adapter)
591 {
592 struct igc_hw *hw = &adapter->hw;
593 int i;
594
595 /* Clear the flags first to avoid new packets to be enqueued
596 * for TX timestamping.
597 */
598 for (i = 0; i < adapter->num_tx_queues; i++) {
599 struct igc_ring *tx_ring = adapter->tx_ring[i];
600
601 clear_bit(IGC_RING_FLAG_TX_HWTSTAMP, &tx_ring->flags);
602 }
603
604 /* Now we can clean the pending TX timestamp requests. */
605 igc_ptp_clear_tx_tstamp(adapter);
606
607 wr32(IGC_TSYNCTXCTL, 0);
608 }
609
igc_ptp_enable_tx_timestamp(struct igc_adapter * adapter)610 static void igc_ptp_enable_tx_timestamp(struct igc_adapter *adapter)
611 {
612 struct igc_hw *hw = &adapter->hw;
613 int i;
614
615 wr32(IGC_TSYNCTXCTL, IGC_TSYNCTXCTL_ENABLED | IGC_TSYNCTXCTL_TXSYNSIG);
616
617 /* Read TXSTMP registers to discard any timestamp previously stored. */
618 rd32(IGC_TXSTMPL);
619 rd32(IGC_TXSTMPH);
620
621 /* The hardware is ready to accept TX timestamp requests,
622 * notify the transmit path.
623 */
624 for (i = 0; i < adapter->num_tx_queues; i++) {
625 struct igc_ring *tx_ring = adapter->tx_ring[i];
626
627 set_bit(IGC_RING_FLAG_TX_HWTSTAMP, &tx_ring->flags);
628 }
629
630 }
631
632 /**
633 * igc_ptp_set_timestamp_mode - setup hardware for timestamping
634 * @adapter: networking device structure
635 * @config: hwtstamp configuration
636 *
637 * Return: 0 in case of success, negative errno code otherwise.
638 */
igc_ptp_set_timestamp_mode(struct igc_adapter * adapter,struct hwtstamp_config * config)639 static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
640 struct hwtstamp_config *config)
641 {
642 switch (config->tx_type) {
643 case HWTSTAMP_TX_OFF:
644 igc_ptp_disable_tx_timestamp(adapter);
645 break;
646 case HWTSTAMP_TX_ON:
647 igc_ptp_enable_tx_timestamp(adapter);
648 break;
649 default:
650 return -ERANGE;
651 }
652
653 switch (config->rx_filter) {
654 case HWTSTAMP_FILTER_NONE:
655 igc_ptp_disable_rx_timestamp(adapter);
656 break;
657 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
658 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
659 case HWTSTAMP_FILTER_PTP_V2_EVENT:
660 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
661 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
662 case HWTSTAMP_FILTER_PTP_V2_SYNC:
663 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
664 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
665 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
666 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
667 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
668 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
669 case HWTSTAMP_FILTER_NTP_ALL:
670 case HWTSTAMP_FILTER_ALL:
671 igc_ptp_enable_rx_timestamp(adapter);
672 config->rx_filter = HWTSTAMP_FILTER_ALL;
673 break;
674 default:
675 return -ERANGE;
676 }
677
678 return 0;
679 }
680
681 /* Requires adapter->ptp_tx_lock held by caller. */
igc_ptp_tx_timeout(struct igc_adapter * adapter,struct igc_tx_timestamp_request * tstamp)682 static void igc_ptp_tx_timeout(struct igc_adapter *adapter,
683 struct igc_tx_timestamp_request *tstamp)
684 {
685 if (tstamp->skb)
686 igc_ptp_free_tx_buffer(adapter, tstamp);
687
688 adapter->tx_hwtstamp_timeouts++;
689
690 netdev_warn(adapter->netdev, "Tx timestamp timeout\n");
691 }
692
igc_ptp_tx_hang(struct igc_adapter * adapter)693 void igc_ptp_tx_hang(struct igc_adapter *adapter)
694 {
695 struct igc_tx_timestamp_request *tstamp;
696 struct igc_hw *hw = &adapter->hw;
697 unsigned long flags;
698 bool found = false;
699 int i;
700
701 spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
702
703 for (i = 0; i < IGC_MAX_TX_TSTAMP_REGS; i++) {
704 tstamp = &adapter->tx_tstamp[i];
705
706 if (!tstamp->skb)
707 continue;
708
709 if (time_is_after_jiffies(tstamp->start + IGC_PTP_TX_TIMEOUT))
710 continue;
711
712 igc_ptp_tx_timeout(adapter, tstamp);
713 found = true;
714 }
715
716 if (found) {
717 /* Reading the high register of the first set of timestamp registers
718 * clears all the equivalent bits in the TSYNCTXCTL register.
719 */
720 rd32(IGC_TXSTMPH_0);
721 }
722
723 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
724 }
725
igc_ptp_tx_reg_to_stamp(struct igc_adapter * adapter,struct igc_tx_timestamp_request * tstamp,u64 regval)726 static void igc_ptp_tx_reg_to_stamp(struct igc_adapter *adapter,
727 struct igc_tx_timestamp_request *tstamp, u64 regval)
728 {
729 struct skb_shared_hwtstamps shhwtstamps;
730 struct sk_buff *skb;
731 int adjust = 0;
732
733 skb = tstamp->skb;
734 if (!skb)
735 return;
736
737 if (igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval))
738 return;
739
740 switch (adapter->link_speed) {
741 case SPEED_10:
742 adjust = IGC_I225_TX_LATENCY_10;
743 break;
744 case SPEED_100:
745 adjust = IGC_I225_TX_LATENCY_100;
746 break;
747 case SPEED_1000:
748 adjust = IGC_I225_TX_LATENCY_1000;
749 break;
750 case SPEED_2500:
751 adjust = IGC_I225_TX_LATENCY_2500;
752 break;
753 }
754
755 shhwtstamps.hwtstamp =
756 ktime_add_ns(shhwtstamps.hwtstamp, adjust);
757
758 /* Copy the tx hardware timestamp into xdp metadata or skb */
759 if (tstamp->buffer_type == IGC_TX_BUFFER_TYPE_XSK) {
760 struct xsk_buff_pool *xsk_pool;
761
762 xsk_pool = adapter->tx_ring[tstamp->xsk_queue_index]->xsk_pool;
763 if (xsk_pool && xp_tx_metadata_enabled(xsk_pool)) {
764 xsk_tx_metadata_complete(&tstamp->xsk_meta,
765 &igc_xsk_tx_metadata_ops,
766 &shhwtstamps.hwtstamp);
767 }
768 } else {
769 skb_tstamp_tx(skb, &shhwtstamps);
770 }
771
772 igc_ptp_free_tx_buffer(adapter, tstamp);
773 }
774
775 /**
776 * igc_ptp_tx_hwtstamp - utility function which checks for TX time stamp
777 * @adapter: Board private structure
778 *
779 * Check against the ready mask for which of the timestamp register
780 * sets are ready to be retrieved, then retrieve that and notify the
781 * rest of the stack.
782 *
783 * Context: Expects adapter->ptp_tx_lock to be held by caller.
784 */
igc_ptp_tx_hwtstamp(struct igc_adapter * adapter)785 static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter)
786 {
787 struct igc_hw *hw = &adapter->hw;
788 u64 regval;
789 u32 mask;
790 int i;
791
792 mask = rd32(IGC_TSYNCTXCTL) & IGC_TSYNCTXCTL_TXTT_ANY;
793 if (mask & IGC_TSYNCTXCTL_TXTT_0) {
794 regval = rd32(IGC_TXSTMPL);
795 regval |= (u64)rd32(IGC_TXSTMPH) << 32;
796 } else {
797 /* There's a bug in the hardware that could cause
798 * missing interrupts for TX timestamping. The issue
799 * is that for new interrupts to be triggered, the
800 * IGC_TXSTMPH_0 register must be read.
801 *
802 * To avoid discarding a valid timestamp that just
803 * happened at the "wrong" time, we need to confirm
804 * that there was no timestamp captured, we do that by
805 * assuming that no two timestamps in sequence have
806 * the same nanosecond value.
807 *
808 * So, we read the "low" register, read the "high"
809 * register (to latch a new timestamp) and read the
810 * "low" register again, if "old" and "new" versions
811 * of the "low" register are different, a valid
812 * timestamp was captured, we can read the "high"
813 * register again.
814 */
815 u32 txstmpl_old, txstmpl_new;
816
817 txstmpl_old = rd32(IGC_TXSTMPL);
818 rd32(IGC_TXSTMPH);
819 txstmpl_new = rd32(IGC_TXSTMPL);
820
821 if (txstmpl_old == txstmpl_new)
822 goto done;
823
824 regval = txstmpl_new;
825 regval |= (u64)rd32(IGC_TXSTMPH) << 32;
826 }
827
828 igc_ptp_tx_reg_to_stamp(adapter, &adapter->tx_tstamp[0], regval);
829
830 done:
831 /* Now that the problematic first register was handled, we can
832 * use retrieve the timestamps from the other registers
833 * (starting from '1') with less complications.
834 */
835 for (i = 1; i < IGC_MAX_TX_TSTAMP_REGS; i++) {
836 struct igc_tx_timestamp_request *tstamp = &adapter->tx_tstamp[i];
837
838 if (!(tstamp->mask & mask))
839 continue;
840
841 regval = rd32(tstamp->regl);
842 regval |= (u64)rd32(tstamp->regh) << 32;
843
844 igc_ptp_tx_reg_to_stamp(adapter, tstamp, regval);
845 }
846 }
847
848 /**
849 * igc_ptp_tx_tstamp_event
850 * @adapter: board private structure
851 *
852 * Called when a TX timestamp interrupt happens to retrieve the
853 * timestamp and send it up to the socket.
854 */
igc_ptp_tx_tstamp_event(struct igc_adapter * adapter)855 void igc_ptp_tx_tstamp_event(struct igc_adapter *adapter)
856 {
857 unsigned long flags;
858
859 spin_lock_irqsave(&adapter->ptp_tx_lock, flags);
860
861 igc_ptp_tx_hwtstamp(adapter);
862
863 spin_unlock_irqrestore(&adapter->ptp_tx_lock, flags);
864 }
865
866 /**
867 * igc_ptp_set_ts_config - set hardware time stamping config
868 * @netdev: network interface device structure
869 * @ifr: interface request data
870 *
871 **/
igc_ptp_set_ts_config(struct net_device * netdev,struct ifreq * ifr)872 int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
873 {
874 struct igc_adapter *adapter = netdev_priv(netdev);
875 struct hwtstamp_config config;
876 int err;
877
878 if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
879 return -EFAULT;
880
881 err = igc_ptp_set_timestamp_mode(adapter, &config);
882 if (err)
883 return err;
884
885 /* save these settings for future reference */
886 memcpy(&adapter->tstamp_config, &config,
887 sizeof(adapter->tstamp_config));
888
889 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
890 -EFAULT : 0;
891 }
892
893 /**
894 * igc_ptp_get_ts_config - get hardware time stamping config
895 * @netdev: network interface device structure
896 * @ifr: interface request data
897 *
898 * Get the hwtstamp_config settings to return to the user. Rather than attempt
899 * to deconstruct the settings from the registers, just return a shadow copy
900 * of the last known settings.
901 **/
igc_ptp_get_ts_config(struct net_device * netdev,struct ifreq * ifr)902 int igc_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr)
903 {
904 struct igc_adapter *adapter = netdev_priv(netdev);
905 struct hwtstamp_config *config = &adapter->tstamp_config;
906
907 return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
908 -EFAULT : 0;
909 }
910
911 /* The two conditions below must be met for cross timestamping via
912 * PCIe PTM:
913 *
914 * 1. We have an way to convert the timestamps in the PTM messages
915 * to something related to the system clocks (right now, only
916 * X86 systems with support for the Always Running Timer allow that);
917 *
918 * 2. We have PTM enabled in the path from the device to the PCIe root port.
919 */
igc_is_crosststamp_supported(struct igc_adapter * adapter)920 static bool igc_is_crosststamp_supported(struct igc_adapter *adapter)
921 {
922 if (!IS_ENABLED(CONFIG_X86_TSC))
923 return false;
924
925 /* FIXME: it was noticed that enabling support for PCIe PTM in
926 * some i225-V models could cause lockups when bringing the
927 * interface up/down. There should be no downsides to
928 * disabling crosstimestamping support for i225-V, as it
929 * doesn't have any PTP support. That way we gain some time
930 * while root causing the issue.
931 */
932 if (adapter->pdev->device == IGC_DEV_ID_I225_V)
933 return false;
934
935 return pcie_ptm_enabled(adapter->pdev);
936 }
937
igc_device_tstamp_to_system(u64 tstamp)938 static struct system_counterval_t igc_device_tstamp_to_system(u64 tstamp)
939 {
940 #if IS_ENABLED(CONFIG_X86_TSC) && !defined(CONFIG_UML)
941 return (struct system_counterval_t) {
942 .cs_id = CSID_X86_ART,
943 .cycles = tstamp,
944 .use_nsecs = true,
945 };
946 #else
947 return (struct system_counterval_t) { };
948 #endif
949 }
950
igc_ptm_log_error(struct igc_adapter * adapter,u32 ptm_stat)951 static void igc_ptm_log_error(struct igc_adapter *adapter, u32 ptm_stat)
952 {
953 struct net_device *netdev = adapter->netdev;
954
955 switch (ptm_stat) {
956 case IGC_PTM_STAT_RET_ERR:
957 netdev_err(netdev, "PTM Error: Root port timeout\n");
958 break;
959 case IGC_PTM_STAT_BAD_PTM_RES:
960 netdev_err(netdev, "PTM Error: Bad response, PTM Response Data expected\n");
961 break;
962 case IGC_PTM_STAT_T4M1_OVFL:
963 netdev_err(netdev, "PTM Error: T4 minus T1 overflow\n");
964 break;
965 case IGC_PTM_STAT_ADJUST_1ST:
966 netdev_err(netdev, "PTM Error: 1588 timer adjusted during first PTM cycle\n");
967 break;
968 case IGC_PTM_STAT_ADJUST_CYC:
969 netdev_err(netdev, "PTM Error: 1588 timer adjusted during non-first PTM cycle\n");
970 break;
971 default:
972 netdev_err(netdev, "PTM Error: Unknown error (%#x)\n", ptm_stat);
973 break;
974 }
975 }
976
igc_phc_get_syncdevicetime(ktime_t * device,struct system_counterval_t * system,void * ctx)977 static int igc_phc_get_syncdevicetime(ktime_t *device,
978 struct system_counterval_t *system,
979 void *ctx)
980 {
981 u32 stat, t2_curr_h, t2_curr_l, ctrl;
982 struct igc_adapter *adapter = ctx;
983 struct igc_hw *hw = &adapter->hw;
984 int err, count = 100;
985 ktime_t t1, t2_curr;
986
987 /* Get a snapshot of system clocks to use as historic value. */
988 ktime_get_snapshot(&adapter->snapshot);
989
990 do {
991 /* Doing this in a loop because in the event of a
992 * badly timed (ha!) system clock adjustment, we may
993 * get PTM errors from the PCI root, but these errors
994 * are transitory. Repeating the process returns valid
995 * data eventually.
996 */
997
998 /* To "manually" start the PTM cycle we need to clear and
999 * then set again the TRIG bit.
1000 */
1001 ctrl = rd32(IGC_PTM_CTRL);
1002 ctrl &= ~IGC_PTM_CTRL_TRIG;
1003 wr32(IGC_PTM_CTRL, ctrl);
1004 ctrl |= IGC_PTM_CTRL_TRIG;
1005 wr32(IGC_PTM_CTRL, ctrl);
1006
1007 /* The cycle only starts "for real" when software notifies
1008 * that it has read the registers, this is done by setting
1009 * VALID bit.
1010 */
1011 wr32(IGC_PTM_STAT, IGC_PTM_STAT_VALID);
1012
1013 err = readx_poll_timeout(rd32, IGC_PTM_STAT, stat,
1014 stat, IGC_PTM_STAT_SLEEP,
1015 IGC_PTM_STAT_TIMEOUT);
1016 if (err < 0) {
1017 netdev_err(adapter->netdev, "Timeout reading IGC_PTM_STAT register\n");
1018 return err;
1019 }
1020
1021 if ((stat & IGC_PTM_STAT_VALID) == IGC_PTM_STAT_VALID)
1022 break;
1023
1024 if (stat & ~IGC_PTM_STAT_VALID) {
1025 /* An error occurred, log it. */
1026 igc_ptm_log_error(adapter, stat);
1027 /* The STAT register is write-1-to-clear (W1C),
1028 * so write the previous error status to clear it.
1029 */
1030 wr32(IGC_PTM_STAT, stat);
1031 continue;
1032 }
1033 } while (--count);
1034
1035 if (!count) {
1036 netdev_err(adapter->netdev, "Exceeded number of tries for PTM cycle\n");
1037 return -ETIMEDOUT;
1038 }
1039
1040 t1 = ktime_set(rd32(IGC_PTM_T1_TIM0_H), rd32(IGC_PTM_T1_TIM0_L));
1041
1042 t2_curr_l = rd32(IGC_PTM_CURR_T2_L);
1043 t2_curr_h = rd32(IGC_PTM_CURR_T2_H);
1044
1045 /* FIXME: When the register that tells the endianness of the
1046 * PTM registers are implemented, check them here and add the
1047 * appropriate conversion.
1048 */
1049 t2_curr_h = swab32(t2_curr_h);
1050
1051 t2_curr = ((s64)t2_curr_h << 32 | t2_curr_l);
1052
1053 *device = t1;
1054 *system = igc_device_tstamp_to_system(t2_curr);
1055
1056 return 0;
1057 }
1058
igc_ptp_getcrosststamp(struct ptp_clock_info * ptp,struct system_device_crosststamp * cts)1059 static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp,
1060 struct system_device_crosststamp *cts)
1061 {
1062 struct igc_adapter *adapter = container_of(ptp, struct igc_adapter,
1063 ptp_caps);
1064
1065 return get_device_system_crosststamp(igc_phc_get_syncdevicetime,
1066 adapter, &adapter->snapshot, cts);
1067 }
1068
igc_ptp_getcyclesx64(struct ptp_clock_info * ptp,struct timespec64 * ts,struct ptp_system_timestamp * sts)1069 static int igc_ptp_getcyclesx64(struct ptp_clock_info *ptp,
1070 struct timespec64 *ts,
1071 struct ptp_system_timestamp *sts)
1072 {
1073 struct igc_adapter *igc = container_of(ptp, struct igc_adapter, ptp_caps);
1074 struct igc_hw *hw = &igc->hw;
1075 unsigned long flags;
1076
1077 spin_lock_irqsave(&igc->free_timer_lock, flags);
1078
1079 ptp_read_system_prets(sts);
1080 ts->tv_nsec = rd32(IGC_SYSTIML_1);
1081 ts->tv_sec = rd32(IGC_SYSTIMH_1);
1082 ptp_read_system_postts(sts);
1083
1084 spin_unlock_irqrestore(&igc->free_timer_lock, flags);
1085
1086 return 0;
1087 }
1088
1089 /**
1090 * igc_ptp_init - Initialize PTP functionality
1091 * @adapter: Board private structure
1092 *
1093 * This function is called at device probe to initialize the PTP
1094 * functionality.
1095 */
igc_ptp_init(struct igc_adapter * adapter)1096 void igc_ptp_init(struct igc_adapter *adapter)
1097 {
1098 struct net_device *netdev = adapter->netdev;
1099 struct igc_tx_timestamp_request *tstamp;
1100 struct igc_hw *hw = &adapter->hw;
1101 int i;
1102
1103 tstamp = &adapter->tx_tstamp[0];
1104 tstamp->mask = IGC_TSYNCTXCTL_TXTT_0;
1105 tstamp->regl = IGC_TXSTMPL_0;
1106 tstamp->regh = IGC_TXSTMPH_0;
1107 tstamp->flags = 0;
1108
1109 tstamp = &adapter->tx_tstamp[1];
1110 tstamp->mask = IGC_TSYNCTXCTL_TXTT_1;
1111 tstamp->regl = IGC_TXSTMPL_1;
1112 tstamp->regh = IGC_TXSTMPH_1;
1113 tstamp->flags = IGC_TX_FLAGS_TSTAMP_1;
1114
1115 tstamp = &adapter->tx_tstamp[2];
1116 tstamp->mask = IGC_TSYNCTXCTL_TXTT_2;
1117 tstamp->regl = IGC_TXSTMPL_2;
1118 tstamp->regh = IGC_TXSTMPH_2;
1119 tstamp->flags = IGC_TX_FLAGS_TSTAMP_2;
1120
1121 tstamp = &adapter->tx_tstamp[3];
1122 tstamp->mask = IGC_TSYNCTXCTL_TXTT_3;
1123 tstamp->regl = IGC_TXSTMPL_3;
1124 tstamp->regh = IGC_TXSTMPH_3;
1125 tstamp->flags = IGC_TX_FLAGS_TSTAMP_3;
1126
1127 switch (hw->mac.type) {
1128 case igc_i225:
1129 for (i = 0; i < IGC_N_SDP; i++) {
1130 struct ptp_pin_desc *ppd = &adapter->sdp_config[i];
1131
1132 snprintf(ppd->name, sizeof(ppd->name), "SDP%d", i);
1133 ppd->index = i;
1134 ppd->func = PTP_PF_NONE;
1135 }
1136 snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
1137 adapter->ptp_caps.owner = THIS_MODULE;
1138 adapter->ptp_caps.max_adj = 62499999;
1139 adapter->ptp_caps.adjfine = igc_ptp_adjfine_i225;
1140 adapter->ptp_caps.adjtime = igc_ptp_adjtime_i225;
1141 adapter->ptp_caps.gettimex64 = igc_ptp_gettimex64_i225;
1142 adapter->ptp_caps.getcyclesx64 = igc_ptp_getcyclesx64;
1143 adapter->ptp_caps.settime64 = igc_ptp_settime_i225;
1144 adapter->ptp_caps.enable = igc_ptp_feature_enable_i225;
1145 adapter->ptp_caps.pps = 1;
1146 adapter->ptp_caps.pin_config = adapter->sdp_config;
1147 adapter->ptp_caps.n_ext_ts = IGC_N_EXTTS;
1148 adapter->ptp_caps.n_per_out = IGC_N_PEROUT;
1149 adapter->ptp_caps.n_pins = IGC_N_SDP;
1150 adapter->ptp_caps.verify = igc_ptp_verify_pin;
1151
1152 if (!igc_is_crosststamp_supported(adapter))
1153 break;
1154
1155 adapter->ptp_caps.getcrosststamp = igc_ptp_getcrosststamp;
1156 break;
1157 default:
1158 adapter->ptp_clock = NULL;
1159 return;
1160 }
1161
1162 spin_lock_init(&adapter->ptp_tx_lock);
1163 spin_lock_init(&adapter->free_timer_lock);
1164 spin_lock_init(&adapter->tmreg_lock);
1165
1166 adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1167 adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1168
1169 adapter->prev_ptp_time = ktime_to_timespec64(ktime_get_real());
1170 adapter->ptp_reset_start = ktime_get();
1171
1172 adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
1173 &adapter->pdev->dev);
1174 if (IS_ERR(adapter->ptp_clock)) {
1175 adapter->ptp_clock = NULL;
1176 netdev_err(netdev, "ptp_clock_register failed\n");
1177 } else if (adapter->ptp_clock) {
1178 netdev_info(netdev, "PHC added\n");
1179 adapter->ptp_flags |= IGC_PTP_ENABLED;
1180 }
1181 }
1182
igc_ptp_time_save(struct igc_adapter * adapter)1183 static void igc_ptp_time_save(struct igc_adapter *adapter)
1184 {
1185 igc_ptp_read(adapter, &adapter->prev_ptp_time);
1186 adapter->ptp_reset_start = ktime_get();
1187 }
1188
igc_ptp_time_restore(struct igc_adapter * adapter)1189 static void igc_ptp_time_restore(struct igc_adapter *adapter)
1190 {
1191 struct timespec64 ts = adapter->prev_ptp_time;
1192 ktime_t delta;
1193
1194 delta = ktime_sub(ktime_get(), adapter->ptp_reset_start);
1195
1196 timespec64_add_ns(&ts, ktime_to_ns(delta));
1197
1198 igc_ptp_write_i225(adapter, &ts);
1199 }
1200
igc_ptm_stop(struct igc_adapter * adapter)1201 static void igc_ptm_stop(struct igc_adapter *adapter)
1202 {
1203 struct igc_hw *hw = &adapter->hw;
1204 u32 ctrl;
1205
1206 ctrl = rd32(IGC_PTM_CTRL);
1207 ctrl &= ~IGC_PTM_CTRL_EN;
1208
1209 wr32(IGC_PTM_CTRL, ctrl);
1210 }
1211
1212 /**
1213 * igc_ptp_suspend - Disable PTP work items and prepare for suspend
1214 * @adapter: Board private structure
1215 *
1216 * This function stops the overflow check work and PTP Tx timestamp work, and
1217 * will prepare the device for OS suspend.
1218 */
igc_ptp_suspend(struct igc_adapter * adapter)1219 void igc_ptp_suspend(struct igc_adapter *adapter)
1220 {
1221 if (!(adapter->ptp_flags & IGC_PTP_ENABLED))
1222 return;
1223
1224 igc_ptp_clear_tx_tstamp(adapter);
1225
1226 if (pci_device_is_present(adapter->pdev)) {
1227 igc_ptp_time_save(adapter);
1228 igc_ptm_stop(adapter);
1229 }
1230 }
1231
1232 /**
1233 * igc_ptp_stop - Disable PTP device and stop the overflow check.
1234 * @adapter: Board private structure.
1235 *
1236 * This function stops the PTP support and cancels the delayed work.
1237 **/
igc_ptp_stop(struct igc_adapter * adapter)1238 void igc_ptp_stop(struct igc_adapter *adapter)
1239 {
1240 igc_ptp_suspend(adapter);
1241
1242 if (adapter->ptp_clock) {
1243 ptp_clock_unregister(adapter->ptp_clock);
1244 netdev_info(adapter->netdev, "PHC removed\n");
1245 adapter->ptp_flags &= ~IGC_PTP_ENABLED;
1246 }
1247 }
1248
1249 /**
1250 * igc_ptp_reset - Re-enable the adapter for PTP following a reset.
1251 * @adapter: Board private structure.
1252 *
1253 * This function handles the reset work required to re-enable the PTP device.
1254 **/
igc_ptp_reset(struct igc_adapter * adapter)1255 void igc_ptp_reset(struct igc_adapter *adapter)
1256 {
1257 struct igc_hw *hw = &adapter->hw;
1258 u32 cycle_ctrl, ctrl;
1259 unsigned long flags;
1260 u32 timadj;
1261
1262 /* reset the tstamp_config */
1263 igc_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
1264
1265 spin_lock_irqsave(&adapter->tmreg_lock, flags);
1266
1267 switch (adapter->hw.mac.type) {
1268 case igc_i225:
1269 timadj = rd32(IGC_TIMADJ);
1270 timadj |= IGC_TIMADJ_ADJUST_METH;
1271 wr32(IGC_TIMADJ, timadj);
1272
1273 wr32(IGC_TSAUXC, 0x0);
1274 wr32(IGC_TSSDP, 0x0);
1275 wr32(IGC_TSIM,
1276 IGC_TSICR_INTERRUPTS |
1277 (adapter->pps_sys_wrap_on ? IGC_TSICR_SYS_WRAP : 0));
1278 wr32(IGC_IMS, IGC_IMS_TS);
1279
1280 if (!igc_is_crosststamp_supported(adapter))
1281 break;
1282
1283 wr32(IGC_PCIE_DIG_DELAY, IGC_PCIE_DIG_DELAY_DEFAULT);
1284 wr32(IGC_PCIE_PHY_DELAY, IGC_PCIE_PHY_DELAY_DEFAULT);
1285
1286 cycle_ctrl = IGC_PTM_CYCLE_CTRL_CYC_TIME(IGC_PTM_CYC_TIME_DEFAULT);
1287
1288 wr32(IGC_PTM_CYCLE_CTRL, cycle_ctrl);
1289
1290 ctrl = IGC_PTM_CTRL_EN |
1291 IGC_PTM_CTRL_START_NOW |
1292 IGC_PTM_CTRL_SHRT_CYC(IGC_PTM_SHORT_CYC_DEFAULT) |
1293 IGC_PTM_CTRL_PTM_TO(IGC_PTM_TIMEOUT_DEFAULT) |
1294 IGC_PTM_CTRL_TRIG;
1295
1296 wr32(IGC_PTM_CTRL, ctrl);
1297
1298 /* Force the first cycle to run. */
1299 wr32(IGC_PTM_STAT, IGC_PTM_STAT_VALID);
1300
1301 break;
1302 default:
1303 /* No work to do. */
1304 goto out;
1305 }
1306
1307 /* Re-initialize the timer. */
1308 if (hw->mac.type == igc_i225) {
1309 igc_ptp_time_restore(adapter);
1310 } else {
1311 timecounter_init(&adapter->tc, &adapter->cc,
1312 ktime_to_ns(ktime_get_real()));
1313 }
1314 out:
1315 spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
1316
1317 wrfl();
1318 }
1319