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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2013 - 2018 Intel Corporation. */
3
4#include <linux/ptp_classify.h>
5#include <linux/posix-clock.h>
6#include "i40e.h"
7#include "i40e_devids.h"
8
9/* The XL710 timesync is very much like Intel's 82599 design when it comes to
10 * the fundamental clock design. However, the clock operations are much simpler
11 * in the XL710 because the device supports a full 64 bits of nanoseconds.
12 * Because the field is so wide, we can forgo the cycle counter and just
13 * operate with the nanosecond field directly without fear of overflow.
14 *
15 * Much like the 82599, the update period is dependent upon the link speed:
16 * At 40Gb, 25Gb, or no link, the period is 1.6ns.
17 * At 10Gb or 5Gb link, the period is multiplied by 2. (3.2ns)
18 * At 1Gb link, the period is multiplied by 20. (32ns)
19 * 1588 functionality is not supported at 100Mbps.
20 */
21#define I40E_PTP_40GB_INCVAL 0x0199999999ULL
22#define I40E_PTP_10GB_INCVAL_MULT 2
23#define I40E_PTP_5GB_INCVAL_MULT 2
24#define I40E_PTP_1GB_INCVAL_MULT 20
25#define I40E_ISGN 0x80000000
26
27#define I40E_PRTTSYN_CTL1_TSYNTYPE_V1 BIT(I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
28#define I40E_PRTTSYN_CTL1_TSYNTYPE_V2 (2 << \
29 I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
30#define I40E_SUBDEV_ID_25G_PTP_PIN 0xB
31
32enum i40e_ptp_pin {
33 SDP3_2 = 0,
34 SDP3_3,
35 GPIO_4
36};
37
38enum i40e_can_set_pins {
39 CANT_DO_PINS = -1,
40 CAN_SET_PINS,
41 CAN_DO_PINS
42};
43
44static struct ptp_pin_desc sdp_desc[] = {
45 /* name idx func chan */
46 {"SDP3_2", SDP3_2, PTP_PF_NONE, 0},
47 {"SDP3_3", SDP3_3, PTP_PF_NONE, 1},
48 {"GPIO_4", GPIO_4, PTP_PF_NONE, 1},
49};
50
51enum i40e_ptp_gpio_pin_state {
52 end = -2,
53 invalid,
54 off,
55 in_A,
56 in_B,
57 out_A,
58 out_B,
59};
60
61static const char * const i40e_ptp_gpio_pin_state2str[] = {
62 "off", "in_A", "in_B", "out_A", "out_B"
63};
64
65enum i40e_ptp_led_pin_state {
66 led_end = -2,
67 low = 0,
68 high,
69};
70
71struct i40e_ptp_pins_settings {
72 enum i40e_ptp_gpio_pin_state sdp3_2;
73 enum i40e_ptp_gpio_pin_state sdp3_3;
74 enum i40e_ptp_gpio_pin_state gpio_4;
75 enum i40e_ptp_led_pin_state led2_0;
76 enum i40e_ptp_led_pin_state led2_1;
77 enum i40e_ptp_led_pin_state led3_0;
78 enum i40e_ptp_led_pin_state led3_1;
79};
80
81static const struct i40e_ptp_pins_settings
82 i40e_ptp_pin_led_allowed_states[] = {
83 {off, off, off, high, high, high, high},
84 {off, in_A, off, high, high, high, low},
85 {off, out_A, off, high, low, high, high},
86 {off, in_B, off, high, high, high, low},
87 {off, out_B, off, high, low, high, high},
88 {in_A, off, off, high, high, high, low},
89 {in_A, in_B, off, high, high, high, low},
90 {in_A, out_B, off, high, low, high, high},
91 {out_A, off, off, high, low, high, high},
92 {out_A, in_B, off, high, low, high, high},
93 {in_B, off, off, high, high, high, low},
94 {in_B, in_A, off, high, high, high, low},
95 {in_B, out_A, off, high, low, high, high},
96 {out_B, off, off, high, low, high, high},
97 {out_B, in_A, off, high, low, high, high},
98 {off, off, in_A, high, high, low, high},
99 {off, out_A, in_A, high, low, low, high},
100 {off, in_B, in_A, high, high, low, low},
101 {off, out_B, in_A, high, low, low, high},
102 {out_A, off, in_A, high, low, low, high},
103 {out_A, in_B, in_A, high, low, low, high},
104 {in_B, off, in_A, high, high, low, low},
105 {in_B, out_A, in_A, high, low, low, high},
106 {out_B, off, in_A, high, low, low, high},
107 {off, off, out_A, low, high, high, high},
108 {off, in_A, out_A, low, high, high, low},
109 {off, in_B, out_A, low, high, high, low},
110 {off, out_B, out_A, low, low, high, high},
111 {in_A, off, out_A, low, high, high, low},
112 {in_A, in_B, out_A, low, high, high, low},
113 {in_A, out_B, out_A, low, low, high, high},
114 {in_B, off, out_A, low, high, high, low},
115 {in_B, in_A, out_A, low, high, high, low},
116 {out_B, off, out_A, low, low, high, high},
117 {out_B, in_A, out_A, low, low, high, high},
118 {off, off, in_B, high, high, low, high},
119 {off, in_A, in_B, high, high, low, low},
120 {off, out_A, in_B, high, low, low, high},
121 {off, out_B, in_B, high, low, low, high},
122 {in_A, off, in_B, high, high, low, low},
123 {in_A, out_B, in_B, high, low, low, high},
124 {out_A, off, in_B, high, low, low, high},
125 {out_B, off, in_B, high, low, low, high},
126 {out_B, in_A, in_B, high, low, low, high},
127 {off, off, out_B, low, high, high, high},
128 {off, in_A, out_B, low, high, high, low},
129 {off, out_A, out_B, low, low, high, high},
130 {off, in_B, out_B, low, high, high, low},
131 {in_A, off, out_B, low, high, high, low},
132 {in_A, in_B, out_B, low, high, high, low},
133 {out_A, off, out_B, low, low, high, high},
134 {out_A, in_B, out_B, low, low, high, high},
135 {in_B, off, out_B, low, high, high, low},
136 {in_B, in_A, out_B, low, high, high, low},
137 {in_B, out_A, out_B, low, low, high, high},
138 {end, end, end, led_end, led_end, led_end, led_end}
139};
140
141static int i40e_ptp_set_pins(struct i40e_pf *pf,
142 struct i40e_ptp_pins_settings *pins);
143
144/**
145 * i40e_ptp_extts0_work - workqueue task function
146 * @work: workqueue task structure
147 *
148 * Service for PTP external clock event
149 **/
150static void i40e_ptp_extts0_work(struct work_struct *work)
151{
152 struct i40e_pf *pf = container_of(work, struct i40e_pf,
153 ptp_extts0_work);
154 struct i40e_hw *hw = &pf->hw;
155 struct ptp_clock_event event;
156 u32 hi, lo;
157
158 /* Event time is captured by one of the two matched registers
159 * PRTTSYN_EVNT_L: 32 LSB of sampled time event
160 * PRTTSYN_EVNT_H: 32 MSB of sampled time event
161 * Event is defined in PRTTSYN_EVNT_0 register
162 */
163 lo = rd32(hw, I40E_PRTTSYN_EVNT_L(0));
164 hi = rd32(hw, I40E_PRTTSYN_EVNT_H(0));
165
166 event.timestamp = (((u64)hi) << 32) | lo;
167
168 event.type = PTP_CLOCK_EXTTS;
169 event.index = hw->pf_id;
170
171 /* fire event */
172 ptp_clock_event(pf->ptp_clock, &event);
173}
174
175/**
176 * i40e_is_ptp_pin_dev - check if device supports PTP pins
177 * @hw: pointer to the hardware structure
178 *
179 * Return true if device supports PTP pins, false otherwise.
180 **/
181static bool i40e_is_ptp_pin_dev(struct i40e_hw *hw)
182{
183 return hw->device_id == I40E_DEV_ID_25G_SFP28 &&
184 hw->subsystem_device_id == I40E_SUBDEV_ID_25G_PTP_PIN;
185}
186
187/**
188 * i40e_can_set_pins - check possibility of manipulating the pins
189 * @pf: board private structure
190 *
191 * Check if all conditions are satisfied to manipulate PTP pins.
192 * Return CAN_SET_PINS if pins can be set on a specific PF or
193 * return CAN_DO_PINS if pins can be manipulated within a NIC or
194 * return CANT_DO_PINS otherwise.
195 **/
196static enum i40e_can_set_pins i40e_can_set_pins(struct i40e_pf *pf)
197{
198 if (!i40e_is_ptp_pin_dev(&pf->hw)) {
199 dev_warn(&pf->pdev->dev,
200 "PTP external clock not supported.\n");
201 return CANT_DO_PINS;
202 }
203
204 if (!pf->ptp_pins) {
205 dev_warn(&pf->pdev->dev,
206 "PTP PIN manipulation not allowed.\n");
207 return CANT_DO_PINS;
208 }
209
210 if (pf->hw.pf_id) {
211 dev_warn(&pf->pdev->dev,
212 "PTP PINs should be accessed via PF0.\n");
213 return CAN_DO_PINS;
214 }
215
216 return CAN_SET_PINS;
217}
218
219/**
220 * i40_ptp_reset_timing_events - Reset PTP timing events
221 * @pf: Board private structure
222 *
223 * This function resets timing events for pf.
224 **/
225static void i40_ptp_reset_timing_events(struct i40e_pf *pf)
226{
227 u32 i;
228
229 spin_lock_bh(&pf->ptp_rx_lock);
230 for (i = 0; i <= I40E_PRTTSYN_RXTIME_L_MAX_INDEX; i++) {
231 /* reading and automatically clearing timing events registers */
232 rd32(&pf->hw, I40E_PRTTSYN_RXTIME_L(i));
233 rd32(&pf->hw, I40E_PRTTSYN_RXTIME_H(i));
234 pf->latch_events[i] = 0;
235 }
236 /* reading and automatically clearing timing events registers */
237 rd32(&pf->hw, I40E_PRTTSYN_TXTIME_L);
238 rd32(&pf->hw, I40E_PRTTSYN_TXTIME_H);
239
240 pf->tx_hwtstamp_timeouts = 0;
241 pf->tx_hwtstamp_skipped = 0;
242 pf->rx_hwtstamp_cleared = 0;
243 pf->latch_event_flags = 0;
244 spin_unlock_bh(&pf->ptp_rx_lock);
245}
246
247/**
248 * i40e_ptp_verify - check pins
249 * @ptp: ptp clock
250 * @pin: pin index
251 * @func: assigned function
252 * @chan: channel
253 *
254 * Check pins consistency.
255 * Return 0 on success or error on failure.
256 **/
257static int i40e_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
258 enum ptp_pin_function func, unsigned int chan)
259{
260 switch (func) {
261 case PTP_PF_NONE:
262 case PTP_PF_EXTTS:
263 case PTP_PF_PEROUT:
264 break;
265 case PTP_PF_PHYSYNC:
266 return -EOPNOTSUPP;
267 }
268 return 0;
269}
270
271/**
272 * i40e_ptp_read - Read the PHC time from the device
273 * @pf: Board private structure
274 * @ts: timespec structure to hold the current time value
275 * @sts: structure to hold the system time before and after reading the PHC
276 *
277 * This function reads the PRTTSYN_TIME registers and stores them in a
278 * timespec. However, since the registers are 64 bits of nanoseconds, we must
279 * convert the result to a timespec before we can return.
280 **/
281static void i40e_ptp_read(struct i40e_pf *pf, struct timespec64 *ts,
282 struct ptp_system_timestamp *sts)
283{
284 struct i40e_hw *hw = &pf->hw;
285 u32 hi, lo;
286 u64 ns;
287
288 /* The timer latches on the lowest register read. */
289 ptp_read_system_prets(sts);
290 lo = rd32(hw, I40E_PRTTSYN_TIME_L);
291 ptp_read_system_postts(sts);
292 hi = rd32(hw, I40E_PRTTSYN_TIME_H);
293
294 ns = (((u64)hi) << 32) | lo;
295
296 *ts = ns_to_timespec64(ns);
297}
298
299/**
300 * i40e_ptp_write - Write the PHC time to the device
301 * @pf: Board private structure
302 * @ts: timespec structure that holds the new time value
303 *
304 * This function writes the PRTTSYN_TIME registers with the user value. Since
305 * we receive a timespec from the stack, we must convert that timespec into
306 * nanoseconds before programming the registers.
307 **/
308static void i40e_ptp_write(struct i40e_pf *pf, const struct timespec64 *ts)
309{
310 struct i40e_hw *hw = &pf->hw;
311 u64 ns = timespec64_to_ns(ts);
312
313 /* The timer will not update until the high register is written, so
314 * write the low register first.
315 */
316 wr32(hw, I40E_PRTTSYN_TIME_L, ns & 0xFFFFFFFF);
317 wr32(hw, I40E_PRTTSYN_TIME_H, ns >> 32);
318}
319
320/**
321 * i40e_ptp_convert_to_hwtstamp - Convert device clock to system time
322 * @hwtstamps: Timestamp structure to update
323 * @timestamp: Timestamp from the hardware
324 *
325 * We need to convert the NIC clock value into a hwtstamp which can be used by
326 * the upper level timestamping functions. Since the timestamp is simply a 64-
327 * bit nanosecond value, we can call ns_to_ktime directly to handle this.
328 **/
329static void i40e_ptp_convert_to_hwtstamp(struct skb_shared_hwtstamps *hwtstamps,
330 u64 timestamp)
331{
332 memset(hwtstamps, 0, sizeof(*hwtstamps));
333
334 hwtstamps->hwtstamp = ns_to_ktime(timestamp);
335}
336
337/**
338 * i40e_ptp_adjfine - Adjust the PHC frequency
339 * @ptp: The PTP clock structure
340 * @scaled_ppm: Scaled parts per million adjustment from base
341 *
342 * Adjust the frequency of the PHC by the indicated delta from the base
343 * frequency.
344 *
345 * Scaled parts per million is ppm with a 16 bit binary fractional field.
346 **/
347static int i40e_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
348{
349 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
350 struct i40e_hw *hw = &pf->hw;
351 u64 adj, base_adj;
352
353 smp_mb(); /* Force any pending update before accessing. */
354 base_adj = I40E_PTP_40GB_INCVAL * READ_ONCE(pf->ptp_adj_mult);
355
356 adj = adjust_by_scaled_ppm(base_adj, scaled_ppm);
357
358 wr32(hw, I40E_PRTTSYN_INC_L, adj & 0xFFFFFFFF);
359 wr32(hw, I40E_PRTTSYN_INC_H, adj >> 32);
360
361 return 0;
362}
363
364/**
365 * i40e_ptp_set_1pps_signal_hw - configure 1PPS PTP signal for pins
366 * @pf: the PF private data structure
367 *
368 * Configure 1PPS signal used for PTP pins
369 **/
370static void i40e_ptp_set_1pps_signal_hw(struct i40e_pf *pf)
371{
372 struct i40e_hw *hw = &pf->hw;
373 struct timespec64 now;
374 u64 ns;
375
376 wr32(hw, I40E_PRTTSYN_AUX_0(1), 0);
377 wr32(hw, I40E_PRTTSYN_AUX_1(1), I40E_PRTTSYN_AUX_1_INSTNT);
378 wr32(hw, I40E_PRTTSYN_AUX_0(1), I40E_PRTTSYN_AUX_0_OUT_ENABLE);
379
380 i40e_ptp_read(pf, &now, NULL);
381 now.tv_sec += I40E_PTP_2_SEC_DELAY;
382 now.tv_nsec = 0;
383 ns = timespec64_to_ns(&now);
384
385 /* I40E_PRTTSYN_TGT_L(1) */
386 wr32(hw, I40E_PRTTSYN_TGT_L(1), ns & 0xFFFFFFFF);
387 /* I40E_PRTTSYN_TGT_H(1) */
388 wr32(hw, I40E_PRTTSYN_TGT_H(1), ns >> 32);
389 wr32(hw, I40E_PRTTSYN_CLKO(1), I40E_PTP_HALF_SECOND);
390 wr32(hw, I40E_PRTTSYN_AUX_1(1), I40E_PRTTSYN_AUX_1_INSTNT);
391 wr32(hw, I40E_PRTTSYN_AUX_0(1),
392 I40E_PRTTSYN_AUX_0_OUT_ENABLE_CLK_MOD);
393}
394
395/**
396 * i40e_ptp_adjtime - Adjust the PHC time
397 * @ptp: The PTP clock structure
398 * @delta: Offset in nanoseconds to adjust the PHC time by
399 *
400 * Adjust the current clock time by a delta specified in nanoseconds.
401 **/
402static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
403{
404 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
405 struct i40e_hw *hw = &pf->hw;
406
407 mutex_lock(&pf->tmreg_lock);
408
409 if (delta > -999999900LL && delta < 999999900LL) {
410 int neg_adj = 0;
411 u32 timadj;
412 u64 tohw;
413
414 if (delta < 0) {
415 neg_adj = 1;
416 tohw = -delta;
417 } else {
418 tohw = delta;
419 }
420
421 timadj = tohw & 0x3FFFFFFF;
422 if (neg_adj)
423 timadj |= I40E_ISGN;
424 wr32(hw, I40E_PRTTSYN_ADJ, timadj);
425 } else {
426 struct timespec64 then, now;
427
428 then = ns_to_timespec64(delta);
429 i40e_ptp_read(pf, &now, NULL);
430 now = timespec64_add(now, then);
431 i40e_ptp_write(pf, (const struct timespec64 *)&now);
432 i40e_ptp_set_1pps_signal_hw(pf);
433 }
434
435 mutex_unlock(&pf->tmreg_lock);
436
437 return 0;
438}
439
440/**
441 * i40e_ptp_gettimex - Get the time of the PHC
442 * @ptp: The PTP clock structure
443 * @ts: timespec structure to hold the current time value
444 * @sts: structure to hold the system time before and after reading the PHC
445 *
446 * Read the device clock and return the correct value on ns, after converting it
447 * into a timespec struct.
448 **/
449static int i40e_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
450 struct ptp_system_timestamp *sts)
451{
452 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
453
454 mutex_lock(&pf->tmreg_lock);
455 i40e_ptp_read(pf, ts, sts);
456 mutex_unlock(&pf->tmreg_lock);
457
458 return 0;
459}
460
461/**
462 * i40e_ptp_settime - Set the time of the PHC
463 * @ptp: The PTP clock structure
464 * @ts: timespec64 structure that holds the new time value
465 *
466 * Set the device clock to the user input value. The conversion from timespec
467 * to ns happens in the write function.
468 **/
469static int i40e_ptp_settime(struct ptp_clock_info *ptp,
470 const struct timespec64 *ts)
471{
472 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
473
474 mutex_lock(&pf->tmreg_lock);
475 i40e_ptp_write(pf, ts);
476 mutex_unlock(&pf->tmreg_lock);
477
478 return 0;
479}
480
481/**
482 * i40e_pps_configure - configure PPS events
483 * @ptp: ptp clock
484 * @rq: clock request
485 * @on: status
486 *
487 * Configure PPS events for external clock source.
488 * Return 0 on success or error on failure.
489 **/
490static int i40e_pps_configure(struct ptp_clock_info *ptp,
491 struct ptp_clock_request *rq,
492 int on)
493{
494 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
495
496 if (!!on)
497 i40e_ptp_set_1pps_signal_hw(pf);
498
499 return 0;
500}
501
502/**
503 * i40e_pin_state - determine PIN state
504 * @index: PIN index
505 * @func: function assigned to PIN
506 *
507 * Determine PIN state based on PIN index and function assigned.
508 * Return PIN state.
509 **/
510static enum i40e_ptp_gpio_pin_state i40e_pin_state(int index, int func)
511{
512 enum i40e_ptp_gpio_pin_state state = off;
513
514 if (index == 0 && func == PTP_PF_EXTTS)
515 state = in_A;
516 if (index == 1 && func == PTP_PF_EXTTS)
517 state = in_B;
518 if (index == 0 && func == PTP_PF_PEROUT)
519 state = out_A;
520 if (index == 1 && func == PTP_PF_PEROUT)
521 state = out_B;
522
523 return state;
524}
525
526/**
527 * i40e_ptp_enable_pin - enable PINs.
528 * @pf: private board structure
529 * @chan: channel
530 * @func: PIN function
531 * @on: state
532 *
533 * Enable PTP pins for external clock source.
534 * Return 0 on success or error code on failure.
535 **/
536static int i40e_ptp_enable_pin(struct i40e_pf *pf, unsigned int chan,
537 enum ptp_pin_function func, int on)
538{
539 enum i40e_ptp_gpio_pin_state *pin = NULL;
540 struct i40e_ptp_pins_settings pins;
541 int pin_index;
542
543 /* Use PF0 to set pins. Return success for user space tools */
544 if (pf->hw.pf_id)
545 return 0;
546
547 /* Preserve previous state of pins that we don't touch */
548 pins.sdp3_2 = pf->ptp_pins->sdp3_2;
549 pins.sdp3_3 = pf->ptp_pins->sdp3_3;
550 pins.gpio_4 = pf->ptp_pins->gpio_4;
551
552 /* To turn on the pin - find the corresponding one based on
553 * the given index. To to turn the function off - find
554 * which pin had it assigned. Don't use ptp_find_pin here
555 * because it tries to lock the pincfg_mux which is locked by
556 * ptp_pin_store() that calls here.
557 */
558 if (on) {
559 pin_index = ptp_find_pin(pf->ptp_clock, func, chan);
560 if (pin_index < 0)
561 return -EBUSY;
562
563 switch (pin_index) {
564 case SDP3_2:
565 pin = &pins.sdp3_2;
566 break;
567 case SDP3_3:
568 pin = &pins.sdp3_3;
569 break;
570 case GPIO_4:
571 pin = &pins.gpio_4;
572 break;
573 default:
574 return -EINVAL;
575 }
576
577 *pin = i40e_pin_state(chan, func);
578 } else {
579 pins.sdp3_2 = off;
580 pins.sdp3_3 = off;
581 pins.gpio_4 = off;
582 }
583
584 return i40e_ptp_set_pins(pf, &pins) ? -EINVAL : 0;
585}
586
587/**
588 * i40e_ptp_feature_enable - Enable external clock pins
589 * @ptp: The PTP clock structure
590 * @rq: The PTP clock request structure
591 * @on: To turn feature on/off
592 *
593 * Setting on/off PTP PPS feature for pin.
594 **/
595static int i40e_ptp_feature_enable(struct ptp_clock_info *ptp,
596 struct ptp_clock_request *rq,
597 int on)
598{
599 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
600
601 enum ptp_pin_function func;
602 unsigned int chan;
603
604 /* TODO: Implement flags handling for EXTTS and PEROUT */
605 switch (rq->type) {
606 case PTP_CLK_REQ_EXTTS:
607 func = PTP_PF_EXTTS;
608 chan = rq->extts.index;
609 break;
610 case PTP_CLK_REQ_PEROUT:
611 func = PTP_PF_PEROUT;
612 chan = rq->perout.index;
613 break;
614 case PTP_CLK_REQ_PPS:
615 return i40e_pps_configure(ptp, rq, on);
616 default:
617 return -EOPNOTSUPP;
618 }
619
620 return i40e_ptp_enable_pin(pf, chan, func, on);
621}
622
623/**
624 * i40e_ptp_get_rx_events - Read I40E_PRTTSYN_STAT_1 and latch events
625 * @pf: the PF data structure
626 *
627 * This function reads I40E_PRTTSYN_STAT_1 and updates the corresponding timers
628 * for noticed latch events. This allows the driver to keep track of the first
629 * time a latch event was noticed which will be used to help clear out Rx
630 * timestamps for packets that got dropped or lost.
631 *
632 * This function will return the current value of I40E_PRTTSYN_STAT_1 and is
633 * expected to be called only while under the ptp_rx_lock.
634 **/
635static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf)
636{
637 struct i40e_hw *hw = &pf->hw;
638 u32 prttsyn_stat, new_latch_events;
639 int i;
640
641 prttsyn_stat = rd32(hw, I40E_PRTTSYN_STAT_1);
642 new_latch_events = prttsyn_stat & ~pf->latch_event_flags;
643
644 /* Update the jiffies time for any newly latched timestamp. This
645 * ensures that we store the time that we first discovered a timestamp
646 * was latched by the hardware. The service task will later determine
647 * if we should free the latch and drop that timestamp should too much
648 * time pass. This flow ensures that we only update jiffies for new
649 * events latched since the last time we checked, and not all events
650 * currently latched, so that the service task accounting remains
651 * accurate.
652 */
653 for (i = 0; i < 4; i++) {
654 if (new_latch_events & BIT(i))
655 pf->latch_events[i] = jiffies;
656 }
657
658 /* Finally, we store the current status of the Rx timestamp latches */
659 pf->latch_event_flags = prttsyn_stat;
660
661 return prttsyn_stat;
662}
663
664/**
665 * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
666 * @pf: The PF private data structure
667 *
668 * This watchdog task is scheduled to detect error case where hardware has
669 * dropped an Rx packet that was timestamped when the ring is full. The
670 * particular error is rare but leaves the device in a state unable to timestamp
671 * any future packets.
672 **/
673void i40e_ptp_rx_hang(struct i40e_pf *pf)
674{
675 struct i40e_hw *hw = &pf->hw;
676 unsigned int i, cleared = 0;
677
678 /* Since we cannot turn off the Rx timestamp logic if the device is
679 * configured for Tx timestamping, we check if Rx timestamping is
680 * configured. We don't want to spuriously warn about Rx timestamp
681 * hangs if we don't care about the timestamps.
682 */
683 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags) || !pf->ptp_rx)
684 return;
685
686 spin_lock_bh(&pf->ptp_rx_lock);
687
688 /* Update current latch times for Rx events */
689 i40e_ptp_get_rx_events(pf);
690
691 /* Check all the currently latched Rx events and see whether they have
692 * been latched for over a second. It is assumed that any timestamp
693 * should have been cleared within this time, or else it was captured
694 * for a dropped frame that the driver never received. Thus, we will
695 * clear any timestamp that has been latched for over 1 second.
696 */
697 for (i = 0; i < 4; i++) {
698 if ((pf->latch_event_flags & BIT(i)) &&
699 time_is_before_jiffies(pf->latch_events[i] + HZ)) {
700 rd32(hw, I40E_PRTTSYN_RXTIME_H(i));
701 pf->latch_event_flags &= ~BIT(i);
702 cleared++;
703 }
704 }
705
706 spin_unlock_bh(&pf->ptp_rx_lock);
707
708 /* Log a warning if more than 2 timestamps got dropped in the same
709 * check. We don't want to warn about all drops because it can occur
710 * in normal scenarios such as PTP frames on multicast addresses we
711 * aren't listening to. However, administrator should know if this is
712 * the reason packets aren't receiving timestamps.
713 */
714 if (cleared > 2)
715 dev_dbg(&pf->pdev->dev,
716 "Dropped %d missed RXTIME timestamp events\n",
717 cleared);
718
719 /* Finally, update the rx_hwtstamp_cleared counter */
720 pf->rx_hwtstamp_cleared += cleared;
721}
722
723/**
724 * i40e_ptp_tx_hang - Detect error case when Tx timestamp register is hung
725 * @pf: The PF private data structure
726 *
727 * This watchdog task is run periodically to make sure that we clear the Tx
728 * timestamp logic if we don't obtain a timestamp in a reasonable amount of
729 * time. It is unexpected in the normal case but if it occurs it results in
730 * permanently preventing timestamps of future packets.
731 **/
732void i40e_ptp_tx_hang(struct i40e_pf *pf)
733{
734 struct sk_buff *skb;
735
736 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags) || !pf->ptp_tx)
737 return;
738
739 /* Nothing to do if we're not already waiting for a timestamp */
740 if (!test_bit(__I40E_PTP_TX_IN_PROGRESS, pf->state))
741 return;
742
743 /* We already have a handler routine which is run when we are notified
744 * of a Tx timestamp in the hardware. If we don't get an interrupt
745 * within a second it is reasonable to assume that we never will.
746 */
747 if (time_is_before_jiffies(pf->ptp_tx_start + HZ)) {
748 skb = pf->ptp_tx_skb;
749 pf->ptp_tx_skb = NULL;
750 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
751
752 /* Free the skb after we clear the bitlock */
753 dev_kfree_skb_any(skb);
754 pf->tx_hwtstamp_timeouts++;
755 }
756}
757
758/**
759 * i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
760 * @pf: Board private structure
761 *
762 * Read the value of the Tx timestamp from the registers, convert it into a
763 * value consumable by the stack, and store that result into the shhwtstamps
764 * struct before returning it up the stack.
765 **/
766void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
767{
768 struct skb_shared_hwtstamps shhwtstamps;
769 struct sk_buff *skb = pf->ptp_tx_skb;
770 struct i40e_hw *hw = &pf->hw;
771 u32 hi, lo;
772 u64 ns;
773
774 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags) || !pf->ptp_tx)
775 return;
776
777 /* don't attempt to timestamp if we don't have an skb */
778 if (!pf->ptp_tx_skb)
779 return;
780
781 lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
782 hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
783
784 ns = (((u64)hi) << 32) | lo;
785 i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
786
787 /* Clear the bit lock as soon as possible after reading the register,
788 * and prior to notifying the stack via skb_tstamp_tx(). Otherwise
789 * applications might wake up and attempt to request another transmit
790 * timestamp prior to the bit lock being cleared.
791 */
792 pf->ptp_tx_skb = NULL;
793 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
794
795 /* Notify the stack and free the skb after we've unlocked */
796 skb_tstamp_tx(skb, &shhwtstamps);
797 dev_kfree_skb_any(skb);
798}
799
800/**
801 * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
802 * @pf: Board private structure
803 * @skb: Particular skb to send timestamp with
804 * @index: Index into the receive timestamp registers for the timestamp
805 *
806 * The XL710 receives a notification in the receive descriptor with an offset
807 * into the set of RXTIME registers where the timestamp is for that skb. This
808 * function goes and fetches the receive timestamp from that offset, if a valid
809 * one exists. The RXTIME registers are in ns, so we must convert the result
810 * first.
811 **/
812void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
813{
814 u32 prttsyn_stat, hi, lo;
815 struct i40e_hw *hw;
816 u64 ns;
817
818 /* Since we cannot turn off the Rx timestamp logic if the device is
819 * doing Tx timestamping, check if Rx timestamping is configured.
820 */
821 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags) || !pf->ptp_rx)
822 return;
823
824 hw = &pf->hw;
825
826 spin_lock_bh(&pf->ptp_rx_lock);
827
828 /* Get current Rx events and update latch times */
829 prttsyn_stat = i40e_ptp_get_rx_events(pf);
830
831 /* TODO: Should we warn about missing Rx timestamp event? */
832 if (!(prttsyn_stat & BIT(index))) {
833 spin_unlock_bh(&pf->ptp_rx_lock);
834 return;
835 }
836
837 /* Clear the latched event since we're about to read its register */
838 pf->latch_event_flags &= ~BIT(index);
839
840 lo = rd32(hw, I40E_PRTTSYN_RXTIME_L(index));
841 hi = rd32(hw, I40E_PRTTSYN_RXTIME_H(index));
842
843 spin_unlock_bh(&pf->ptp_rx_lock);
844
845 ns = (((u64)hi) << 32) | lo;
846
847 i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
848}
849
850/**
851 * i40e_ptp_set_increment - Utility function to update clock increment rate
852 * @pf: Board private structure
853 *
854 * During a link change, the DMA frequency that drives the 1588 logic will
855 * change. In order to keep the PRTTSYN_TIME registers in units of nanoseconds,
856 * we must update the increment value per clock tick.
857 **/
858void i40e_ptp_set_increment(struct i40e_pf *pf)
859{
860 struct i40e_link_status *hw_link_info;
861 struct i40e_hw *hw = &pf->hw;
862 u64 incval;
863 u32 mult;
864
865 hw_link_info = &hw->phy.link_info;
866
867 i40e_aq_get_link_info(&pf->hw, true, NULL, NULL);
868
869 switch (hw_link_info->link_speed) {
870 case I40E_LINK_SPEED_10GB:
871 mult = I40E_PTP_10GB_INCVAL_MULT;
872 break;
873 case I40E_LINK_SPEED_5GB:
874 mult = I40E_PTP_5GB_INCVAL_MULT;
875 break;
876 case I40E_LINK_SPEED_1GB:
877 mult = I40E_PTP_1GB_INCVAL_MULT;
878 break;
879 case I40E_LINK_SPEED_100MB:
880 {
881 static int warn_once;
882
883 if (!warn_once) {
884 dev_warn(&pf->pdev->dev,
885 "1588 functionality is not supported at 100 Mbps. Stopping the PHC.\n");
886 warn_once++;
887 }
888 mult = 0;
889 break;
890 }
891 case I40E_LINK_SPEED_40GB:
892 default:
893 mult = 1;
894 break;
895 }
896
897 /* The increment value is calculated by taking the base 40GbE incvalue
898 * and multiplying it by a factor based on the link speed.
899 */
900 incval = I40E_PTP_40GB_INCVAL * mult;
901
902 /* Write the new increment value into the increment register. The
903 * hardware will not update the clock until both registers have been
904 * written.
905 */
906 wr32(hw, I40E_PRTTSYN_INC_L, incval & 0xFFFFFFFF);
907 wr32(hw, I40E_PRTTSYN_INC_H, incval >> 32);
908
909 /* Update the base adjustement value. */
910 WRITE_ONCE(pf->ptp_adj_mult, mult);
911 smp_mb(); /* Force the above update. */
912}
913
914/**
915 * i40e_ptp_get_ts_config - ioctl interface to read the HW timestamping
916 * @pf: Board private structure
917 * @ifr: ioctl data
918 *
919 * Obtain the current hardware timestamping settigs as requested. To do this,
920 * keep a shadow copy of the timestamp settings rather than attempting to
921 * deconstruct it from the registers.
922 **/
923int i40e_ptp_get_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
924{
925 struct hwtstamp_config *config = &pf->tstamp_config;
926
927 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags))
928 return -EOPNOTSUPP;
929
930 return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
931 -EFAULT : 0;
932}
933
934/**
935 * i40e_ptp_free_pins - free memory used by PTP pins
936 * @pf: Board private structure
937 *
938 * Release memory allocated for PTP pins.
939 **/
940static void i40e_ptp_free_pins(struct i40e_pf *pf)
941{
942 if (i40e_is_ptp_pin_dev(&pf->hw)) {
943 kfree(pf->ptp_pins);
944 kfree(pf->ptp_caps.pin_config);
945 pf->ptp_pins = NULL;
946 }
947}
948
949/**
950 * i40e_ptp_set_pin_hw - Set HW GPIO pin
951 * @hw: pointer to the hardware structure
952 * @pin: pin index
953 * @state: pin state
954 *
955 * Set status of GPIO pin for external clock handling.
956 **/
957static void i40e_ptp_set_pin_hw(struct i40e_hw *hw,
958 unsigned int pin,
959 enum i40e_ptp_gpio_pin_state state)
960{
961 switch (state) {
962 case off:
963 wr32(hw, I40E_GLGEN_GPIO_CTL(pin), 0);
964 break;
965 case in_A:
966 wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
967 I40E_GLGEN_GPIO_CTL_PORT_0_IN_TIMESYNC_0);
968 break;
969 case in_B:
970 wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
971 I40E_GLGEN_GPIO_CTL_PORT_1_IN_TIMESYNC_0);
972 break;
973 case out_A:
974 wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
975 I40E_GLGEN_GPIO_CTL_PORT_0_OUT_TIMESYNC_1);
976 break;
977 case out_B:
978 wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
979 I40E_GLGEN_GPIO_CTL_PORT_1_OUT_TIMESYNC_1);
980 break;
981 default:
982 break;
983 }
984}
985
986/**
987 * i40e_ptp_set_led_hw - Set HW GPIO led
988 * @hw: pointer to the hardware structure
989 * @led: led index
990 * @state: led state
991 *
992 * Set status of GPIO led for external clock handling.
993 **/
994static void i40e_ptp_set_led_hw(struct i40e_hw *hw,
995 unsigned int led,
996 enum i40e_ptp_led_pin_state state)
997{
998 switch (state) {
999 case low:
1000 wr32(hw, I40E_GLGEN_GPIO_SET,
1001 I40E_GLGEN_GPIO_SET_DRV_SDP_DATA | led);
1002 break;
1003 case high:
1004 wr32(hw, I40E_GLGEN_GPIO_SET,
1005 I40E_GLGEN_GPIO_SET_DRV_SDP_DATA |
1006 I40E_GLGEN_GPIO_SET_SDP_DATA_HI | led);
1007 break;
1008 default:
1009 break;
1010 }
1011}
1012
1013/**
1014 * i40e_ptp_init_leds_hw - init LEDs
1015 * @hw: pointer to a hardware structure
1016 *
1017 * Set initial state of LEDs
1018 **/
1019static void i40e_ptp_init_leds_hw(struct i40e_hw *hw)
1020{
1021 wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED2_0),
1022 I40E_GLGEN_GPIO_CTL_LED_INIT);
1023 wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED2_1),
1024 I40E_GLGEN_GPIO_CTL_LED_INIT);
1025 wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED3_0),
1026 I40E_GLGEN_GPIO_CTL_LED_INIT);
1027 wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED3_1),
1028 I40E_GLGEN_GPIO_CTL_LED_INIT);
1029}
1030
1031/**
1032 * i40e_ptp_set_pins_hw - Set HW GPIO pins
1033 * @pf: Board private structure
1034 *
1035 * This function sets GPIO pins for PTP
1036 **/
1037static void i40e_ptp_set_pins_hw(struct i40e_pf *pf)
1038{
1039 const struct i40e_ptp_pins_settings *pins = pf->ptp_pins;
1040 struct i40e_hw *hw = &pf->hw;
1041
1042 /* pin must be disabled before it may be used */
1043 i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, off);
1044 i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, off);
1045 i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, off);
1046
1047 i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, pins->sdp3_2);
1048 i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, pins->sdp3_3);
1049 i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, pins->gpio_4);
1050
1051 i40e_ptp_set_led_hw(hw, I40E_LED2_0, pins->led2_0);
1052 i40e_ptp_set_led_hw(hw, I40E_LED2_1, pins->led2_1);
1053 i40e_ptp_set_led_hw(hw, I40E_LED3_0, pins->led3_0);
1054 i40e_ptp_set_led_hw(hw, I40E_LED3_1, pins->led3_1);
1055
1056 dev_info(&pf->pdev->dev,
1057 "PTP configuration set to: SDP3_2: %s, SDP3_3: %s, GPIO_4: %s.\n",
1058 i40e_ptp_gpio_pin_state2str[pins->sdp3_2],
1059 i40e_ptp_gpio_pin_state2str[pins->sdp3_3],
1060 i40e_ptp_gpio_pin_state2str[pins->gpio_4]);
1061}
1062
1063/**
1064 * i40e_ptp_set_pins - set PTP pins in HW
1065 * @pf: Board private structure
1066 * @pins: PTP pins to be applied
1067 *
1068 * Validate and set PTP pins in HW for specific PF.
1069 * Return 0 on success or negative value on error.
1070 **/
1071static int i40e_ptp_set_pins(struct i40e_pf *pf,
1072 struct i40e_ptp_pins_settings *pins)
1073{
1074 enum i40e_can_set_pins pin_caps = i40e_can_set_pins(pf);
1075 int i = 0;
1076
1077 if (pin_caps == CANT_DO_PINS)
1078 return -EOPNOTSUPP;
1079 else if (pin_caps == CAN_DO_PINS)
1080 return 0;
1081
1082 if (pins->sdp3_2 == invalid)
1083 pins->sdp3_2 = pf->ptp_pins->sdp3_2;
1084 if (pins->sdp3_3 == invalid)
1085 pins->sdp3_3 = pf->ptp_pins->sdp3_3;
1086 if (pins->gpio_4 == invalid)
1087 pins->gpio_4 = pf->ptp_pins->gpio_4;
1088 while (i40e_ptp_pin_led_allowed_states[i].sdp3_2 != end) {
1089 if (pins->sdp3_2 == i40e_ptp_pin_led_allowed_states[i].sdp3_2 &&
1090 pins->sdp3_3 == i40e_ptp_pin_led_allowed_states[i].sdp3_3 &&
1091 pins->gpio_4 == i40e_ptp_pin_led_allowed_states[i].gpio_4) {
1092 pins->led2_0 =
1093 i40e_ptp_pin_led_allowed_states[i].led2_0;
1094 pins->led2_1 =
1095 i40e_ptp_pin_led_allowed_states[i].led2_1;
1096 pins->led3_0 =
1097 i40e_ptp_pin_led_allowed_states[i].led3_0;
1098 pins->led3_1 =
1099 i40e_ptp_pin_led_allowed_states[i].led3_1;
1100 break;
1101 }
1102 i++;
1103 }
1104 if (i40e_ptp_pin_led_allowed_states[i].sdp3_2 == end) {
1105 dev_warn(&pf->pdev->dev,
1106 "Unsupported PTP pin configuration: SDP3_2: %s, SDP3_3: %s, GPIO_4: %s.\n",
1107 i40e_ptp_gpio_pin_state2str[pins->sdp3_2],
1108 i40e_ptp_gpio_pin_state2str[pins->sdp3_3],
1109 i40e_ptp_gpio_pin_state2str[pins->gpio_4]);
1110
1111 return -EPERM;
1112 }
1113 memcpy(pf->ptp_pins, pins, sizeof(*pins));
1114 i40e_ptp_set_pins_hw(pf);
1115 i40_ptp_reset_timing_events(pf);
1116
1117 return 0;
1118}
1119
1120/**
1121 * i40e_ptp_alloc_pins - allocate PTP pins structure
1122 * @pf: Board private structure
1123 *
1124 * allocate PTP pins structure
1125 **/
1126int i40e_ptp_alloc_pins(struct i40e_pf *pf)
1127{
1128 if (!i40e_is_ptp_pin_dev(&pf->hw))
1129 return 0;
1130
1131 pf->ptp_pins =
1132 kzalloc(sizeof(struct i40e_ptp_pins_settings), GFP_KERNEL);
1133
1134 if (!pf->ptp_pins) {
1135 dev_warn(&pf->pdev->dev, "Cannot allocate memory for PTP pins structure.\n");
1136 return -ENOMEM;
1137 }
1138
1139 pf->ptp_pins->sdp3_2 = off;
1140 pf->ptp_pins->sdp3_3 = off;
1141 pf->ptp_pins->gpio_4 = off;
1142 pf->ptp_pins->led2_0 = high;
1143 pf->ptp_pins->led2_1 = high;
1144 pf->ptp_pins->led3_0 = high;
1145 pf->ptp_pins->led3_1 = high;
1146
1147 /* Use PF0 to set pins in HW. Return success for user space tools */
1148 if (pf->hw.pf_id)
1149 return 0;
1150
1151 i40e_ptp_init_leds_hw(&pf->hw);
1152 i40e_ptp_set_pins_hw(pf);
1153
1154 return 0;
1155}
1156
1157/**
1158 * i40e_ptp_set_timestamp_mode - setup hardware for requested timestamp mode
1159 * @pf: Board private structure
1160 * @config: hwtstamp settings requested or saved
1161 *
1162 * Control hardware registers to enter the specific mode requested by the
1163 * user. Also used during reset path to ensure that timestamp settings are
1164 * maintained.
1165 *
1166 * Note: modifies config in place, and may update the requested mode to be
1167 * more broad if the specific filter is not directly supported.
1168 **/
1169static int i40e_ptp_set_timestamp_mode(struct i40e_pf *pf,
1170 struct hwtstamp_config *config)
1171{
1172 struct i40e_hw *hw = &pf->hw;
1173 u32 tsyntype, regval;
1174
1175 /* Selects external trigger to cause event */
1176 regval = rd32(hw, I40E_PRTTSYN_AUX_0(0));
1177 /* Bit 17:16 is EVNTLVL, 01B rising edge */
1178 regval &= 0;
1179 regval |= (1 << I40E_PRTTSYN_AUX_0_EVNTLVL_SHIFT);
1180 /* regval: 0001 0000 0000 0000 0000 */
1181 wr32(hw, I40E_PRTTSYN_AUX_0(0), regval);
1182
1183 /* Enabel interrupts */
1184 regval = rd32(hw, I40E_PRTTSYN_CTL0);
1185 regval |= 1 << I40E_PRTTSYN_CTL0_EVENT_INT_ENA_SHIFT;
1186 wr32(hw, I40E_PRTTSYN_CTL0, regval);
1187
1188 INIT_WORK(&pf->ptp_extts0_work, i40e_ptp_extts0_work);
1189
1190 switch (config->tx_type) {
1191 case HWTSTAMP_TX_OFF:
1192 pf->ptp_tx = false;
1193 break;
1194 case HWTSTAMP_TX_ON:
1195 pf->ptp_tx = true;
1196 break;
1197 default:
1198 return -ERANGE;
1199 }
1200
1201 switch (config->rx_filter) {
1202 case HWTSTAMP_FILTER_NONE:
1203 pf->ptp_rx = false;
1204 /* We set the type to V1, but do not enable UDP packet
1205 * recognition. In this way, we should be as close to
1206 * disabling PTP Rx timestamps as possible since V1 packets
1207 * are always UDP, since L2 packets are a V2 feature.
1208 */
1209 tsyntype = I40E_PRTTSYN_CTL1_TSYNTYPE_V1;
1210 break;
1211 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1212 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1213 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1214 if (!test_bit(I40E_HW_CAP_PTP_L4, pf->hw.caps))
1215 return -ERANGE;
1216 pf->ptp_rx = true;
1217 tsyntype = I40E_PRTTSYN_CTL1_V1MESSTYPE0_MASK |
1218 I40E_PRTTSYN_CTL1_TSYNTYPE_V1 |
1219 I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
1220 config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
1221 break;
1222 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1223 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1224 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1225 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1226 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1227 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1228 if (!test_bit(I40E_HW_CAP_PTP_L4, pf->hw.caps))
1229 return -ERANGE;
1230 fallthrough;
1231 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1232 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1233 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1234 pf->ptp_rx = true;
1235 tsyntype = I40E_PRTTSYN_CTL1_V2MESSTYPE0_MASK |
1236 I40E_PRTTSYN_CTL1_TSYNTYPE_V2;
1237 if (test_bit(I40E_HW_CAP_PTP_L4, pf->hw.caps)) {
1238 tsyntype |= I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
1239 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
1240 } else {
1241 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
1242 }
1243 break;
1244 case HWTSTAMP_FILTER_NTP_ALL:
1245 case HWTSTAMP_FILTER_ALL:
1246 default:
1247 return -ERANGE;
1248 }
1249
1250 /* Clear out all 1588-related registers to clear and unlatch them. */
1251 spin_lock_bh(&pf->ptp_rx_lock);
1252 rd32(hw, I40E_PRTTSYN_STAT_0);
1253 rd32(hw, I40E_PRTTSYN_TXTIME_H);
1254 rd32(hw, I40E_PRTTSYN_RXTIME_H(0));
1255 rd32(hw, I40E_PRTTSYN_RXTIME_H(1));
1256 rd32(hw, I40E_PRTTSYN_RXTIME_H(2));
1257 rd32(hw, I40E_PRTTSYN_RXTIME_H(3));
1258 pf->latch_event_flags = 0;
1259 spin_unlock_bh(&pf->ptp_rx_lock);
1260
1261 /* Enable/disable the Tx timestamp interrupt based on user input. */
1262 regval = rd32(hw, I40E_PRTTSYN_CTL0);
1263 if (pf->ptp_tx)
1264 regval |= I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
1265 else
1266 regval &= ~I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
1267 wr32(hw, I40E_PRTTSYN_CTL0, regval);
1268
1269 regval = rd32(hw, I40E_PFINT_ICR0_ENA);
1270 if (pf->ptp_tx)
1271 regval |= I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
1272 else
1273 regval &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
1274 wr32(hw, I40E_PFINT_ICR0_ENA, regval);
1275
1276 /* Although there is no simple on/off switch for Rx, we "disable" Rx
1277 * timestamps by setting to V1 only mode and clear the UDP
1278 * recognition. This ought to disable all PTP Rx timestamps as V1
1279 * packets are always over UDP. Note that software is configured to
1280 * ignore Rx timestamps via the pf->ptp_rx flag.
1281 */
1282 regval = rd32(hw, I40E_PRTTSYN_CTL1);
1283 /* clear everything but the enable bit */
1284 regval &= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
1285 /* now enable bits for desired Rx timestamps */
1286 regval |= tsyntype;
1287 wr32(hw, I40E_PRTTSYN_CTL1, regval);
1288
1289 return 0;
1290}
1291
1292/**
1293 * i40e_ptp_set_ts_config - ioctl interface to control the HW timestamping
1294 * @pf: Board private structure
1295 * @ifr: ioctl data
1296 *
1297 * Respond to the user filter requests and make the appropriate hardware
1298 * changes here. The XL710 cannot support splitting of the Tx/Rx timestamping
1299 * logic, so keep track in software of whether to indicate these timestamps
1300 * or not.
1301 *
1302 * It is permissible to "upgrade" the user request to a broader filter, as long
1303 * as the user receives the timestamps they care about and the user is notified
1304 * the filter has been broadened.
1305 **/
1306int i40e_ptp_set_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
1307{
1308 struct hwtstamp_config config;
1309 int err;
1310
1311 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags))
1312 return -EOPNOTSUPP;
1313
1314 if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
1315 return -EFAULT;
1316
1317 err = i40e_ptp_set_timestamp_mode(pf, &config);
1318 if (err)
1319 return err;
1320
1321 /* save these settings for future reference */
1322 pf->tstamp_config = config;
1323
1324 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
1325 -EFAULT : 0;
1326}
1327
1328/**
1329 * i40e_init_pin_config - initialize pins.
1330 * @pf: private board structure
1331 *
1332 * Initialize pins for external clock source.
1333 * Return 0 on success or error code on failure.
1334 **/
1335static int i40e_init_pin_config(struct i40e_pf *pf)
1336{
1337 int i;
1338
1339 pf->ptp_caps.n_pins = 3;
1340 pf->ptp_caps.n_ext_ts = 2;
1341 pf->ptp_caps.pps = 1;
1342 pf->ptp_caps.n_per_out = 2;
1343
1344 pf->ptp_caps.pin_config = kcalloc(pf->ptp_caps.n_pins,
1345 sizeof(*pf->ptp_caps.pin_config),
1346 GFP_KERNEL);
1347 if (!pf->ptp_caps.pin_config)
1348 return -ENOMEM;
1349
1350 for (i = 0; i < pf->ptp_caps.n_pins; i++) {
1351 snprintf(pf->ptp_caps.pin_config[i].name,
1352 sizeof(pf->ptp_caps.pin_config[i].name),
1353 "%s", sdp_desc[i].name);
1354 pf->ptp_caps.pin_config[i].index = sdp_desc[i].index;
1355 pf->ptp_caps.pin_config[i].func = PTP_PF_NONE;
1356 pf->ptp_caps.pin_config[i].chan = sdp_desc[i].chan;
1357 }
1358
1359 pf->ptp_caps.verify = i40e_ptp_verify;
1360 pf->ptp_caps.enable = i40e_ptp_feature_enable;
1361
1362 pf->ptp_caps.pps = 1;
1363
1364 return 0;
1365}
1366
1367/**
1368 * i40e_ptp_create_clock - Create PTP clock device for userspace
1369 * @pf: Board private structure
1370 *
1371 * This function creates a new PTP clock device. It only creates one if we
1372 * don't already have one, so it is safe to call. Will return error if it
1373 * can't create one, but success if we already have a device. Should be used
1374 * by i40e_ptp_init to create clock initially, and prevent global resets from
1375 * creating new clock devices.
1376 **/
1377static long i40e_ptp_create_clock(struct i40e_pf *pf)
1378{
1379 /* no need to create a clock device if we already have one */
1380 if (!IS_ERR_OR_NULL(pf->ptp_clock))
1381 return 0;
1382
1383 strscpy(pf->ptp_caps.name, i40e_driver_name,
1384 sizeof(pf->ptp_caps.name) - 1);
1385 pf->ptp_caps.owner = THIS_MODULE;
1386 pf->ptp_caps.max_adj = 999999999;
1387 pf->ptp_caps.adjfine = i40e_ptp_adjfine;
1388 pf->ptp_caps.adjtime = i40e_ptp_adjtime;
1389 pf->ptp_caps.gettimex64 = i40e_ptp_gettimex;
1390 pf->ptp_caps.settime64 = i40e_ptp_settime;
1391 if (i40e_is_ptp_pin_dev(&pf->hw)) {
1392 int err = i40e_init_pin_config(pf);
1393
1394 if (err)
1395 return err;
1396 }
1397
1398 /* Attempt to register the clock before enabling the hardware. */
1399 pf->ptp_clock = ptp_clock_register(&pf->ptp_caps, &pf->pdev->dev);
1400 if (IS_ERR(pf->ptp_clock))
1401 return PTR_ERR(pf->ptp_clock);
1402
1403 /* clear the hwtstamp settings here during clock create, instead of
1404 * during regular init, so that we can maintain settings across a
1405 * reset or suspend.
1406 */
1407 pf->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1408 pf->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1409
1410 /* Set the previous "reset" time to the current Kernel clock time */
1411 ktime_get_real_ts64(&pf->ptp_prev_hw_time);
1412 pf->ptp_reset_start = ktime_get();
1413
1414 return 0;
1415}
1416
1417/**
1418 * i40e_ptp_save_hw_time - Save the current PTP time as ptp_prev_hw_time
1419 * @pf: Board private structure
1420 *
1421 * Read the current PTP time and save it into pf->ptp_prev_hw_time. This should
1422 * be called at the end of preparing to reset, just before hardware reset
1423 * occurs, in order to preserve the PTP time as close as possible across
1424 * resets.
1425 */
1426void i40e_ptp_save_hw_time(struct i40e_pf *pf)
1427{
1428 /* don't try to access the PTP clock if it's not enabled */
1429 if (!test_bit(I40E_FLAG_PTP_ENA, pf->flags))
1430 return;
1431
1432 i40e_ptp_gettimex(&pf->ptp_caps, &pf->ptp_prev_hw_time, NULL);
1433 /* Get a monotonic starting time for this reset */
1434 pf->ptp_reset_start = ktime_get();
1435}
1436
1437/**
1438 * i40e_ptp_restore_hw_time - Restore the ptp_prev_hw_time + delta to PTP regs
1439 * @pf: Board private structure
1440 *
1441 * Restore the PTP hardware clock registers. We previously cached the PTP
1442 * hardware time as pf->ptp_prev_hw_time. To be as accurate as possible,
1443 * update this value based on the time delta since the time was saved, using
1444 * CLOCK_MONOTONIC (via ktime_get()) to calculate the time difference.
1445 *
1446 * This ensures that the hardware clock is restored to nearly what it should
1447 * have been if a reset had not occurred.
1448 */
1449void i40e_ptp_restore_hw_time(struct i40e_pf *pf)
1450{
1451 ktime_t delta = ktime_sub(ktime_get(), pf->ptp_reset_start);
1452
1453 /* Update the previous HW time with the ktime delta */
1454 timespec64_add_ns(&pf->ptp_prev_hw_time, ktime_to_ns(delta));
1455
1456 /* Restore the hardware clock registers */
1457 i40e_ptp_settime(&pf->ptp_caps, &pf->ptp_prev_hw_time);
1458}
1459
1460/**
1461 * i40e_ptp_init - Initialize the 1588 support after device probe or reset
1462 * @pf: Board private structure
1463 *
1464 * This function sets device up for 1588 support. The first time it is run, it
1465 * will create a PHC clock device. It does not create a clock device if one
1466 * already exists. It also reconfigures the device after a reset.
1467 *
1468 * The first time a clock is created, i40e_ptp_create_clock will set
1469 * pf->ptp_prev_hw_time to the current system time. During resets, it is
1470 * expected that this timespec will be set to the last known PTP clock time,
1471 * in order to preserve the clock time as close as possible across a reset.
1472 **/
1473void i40e_ptp_init(struct i40e_pf *pf)
1474{
1475 struct i40e_vsi *vsi = i40e_pf_get_main_vsi(pf);
1476 struct net_device *netdev = vsi->netdev;
1477 struct i40e_hw *hw = &pf->hw;
1478 u32 pf_id;
1479 long err;
1480
1481 /* Only one PF is assigned to control 1588 logic per port. Do not
1482 * enable any support for PFs not assigned via PRTTSYN_CTL0.PF_ID
1483 */
1484 pf_id = FIELD_GET(I40E_PRTTSYN_CTL0_PF_ID_MASK,
1485 rd32(hw, I40E_PRTTSYN_CTL0));
1486 if (hw->pf_id != pf_id) {
1487 clear_bit(I40E_FLAG_PTP_ENA, pf->flags);
1488 dev_info(&pf->pdev->dev, "%s: PTP not supported on %s\n",
1489 __func__,
1490 netdev->name);
1491 return;
1492 }
1493
1494 mutex_init(&pf->tmreg_lock);
1495 spin_lock_init(&pf->ptp_rx_lock);
1496
1497 /* ensure we have a clock device */
1498 err = i40e_ptp_create_clock(pf);
1499 if (err) {
1500 pf->ptp_clock = NULL;
1501 dev_err(&pf->pdev->dev, "%s: ptp_clock_register failed\n",
1502 __func__);
1503 } else if (pf->ptp_clock) {
1504 u32 regval;
1505
1506 if (pf->hw.debug_mask & I40E_DEBUG_LAN)
1507 dev_info(&pf->pdev->dev, "PHC enabled\n");
1508 set_bit(I40E_FLAG_PTP_ENA, pf->flags);
1509
1510 /* Ensure the clocks are running. */
1511 regval = rd32(hw, I40E_PRTTSYN_CTL0);
1512 regval |= I40E_PRTTSYN_CTL0_TSYNENA_MASK;
1513 wr32(hw, I40E_PRTTSYN_CTL0, regval);
1514 regval = rd32(hw, I40E_PRTTSYN_CTL1);
1515 regval |= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
1516 wr32(hw, I40E_PRTTSYN_CTL1, regval);
1517
1518 /* Set the increment value per clock tick. */
1519 i40e_ptp_set_increment(pf);
1520
1521 /* reset timestamping mode */
1522 i40e_ptp_set_timestamp_mode(pf, &pf->tstamp_config);
1523
1524 /* Restore the clock time based on last known value */
1525 i40e_ptp_restore_hw_time(pf);
1526 }
1527
1528 i40e_ptp_set_1pps_signal_hw(pf);
1529}
1530
1531/**
1532 * i40e_ptp_stop - Disable the driver/hardware support and unregister the PHC
1533 * @pf: Board private structure
1534 *
1535 * This function handles the cleanup work required from the initialization by
1536 * clearing out the important information and unregistering the PHC.
1537 **/
1538void i40e_ptp_stop(struct i40e_pf *pf)
1539{
1540 struct i40e_vsi *main_vsi = i40e_pf_get_main_vsi(pf);
1541 struct i40e_hw *hw = &pf->hw;
1542 u32 regval;
1543
1544 clear_bit(I40E_FLAG_PTP_ENA, pf->flags);
1545 pf->ptp_tx = false;
1546 pf->ptp_rx = false;
1547
1548 if (pf->ptp_tx_skb) {
1549 struct sk_buff *skb = pf->ptp_tx_skb;
1550
1551 pf->ptp_tx_skb = NULL;
1552 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
1553 dev_kfree_skb_any(skb);
1554 }
1555
1556 if (pf->ptp_clock) {
1557 ptp_clock_unregister(pf->ptp_clock);
1558 pf->ptp_clock = NULL;
1559 dev_info(&pf->pdev->dev, "%s: removed PHC on %s\n", __func__,
1560 main_vsi->netdev->name);
1561 }
1562
1563 if (i40e_is_ptp_pin_dev(&pf->hw)) {
1564 i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, off);
1565 i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, off);
1566 i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, off);
1567 }
1568
1569 regval = rd32(hw, I40E_PRTTSYN_AUX_0(0));
1570 regval &= ~I40E_PRTTSYN_AUX_0_PTPFLAG_MASK;
1571 wr32(hw, I40E_PRTTSYN_AUX_0(0), regval);
1572
1573 /* Disable interrupts */
1574 regval = rd32(hw, I40E_PRTTSYN_CTL0);
1575 regval &= ~I40E_PRTTSYN_CTL0_EVENT_INT_ENA_MASK;
1576 wr32(hw, I40E_PRTTSYN_CTL0, regval);
1577
1578 i40e_ptp_free_pins(pf);
1579}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2013 - 2018 Intel Corporation. */
3
4#include "i40e.h"
5#include <linux/ptp_classify.h>
6
7/* The XL710 timesync is very much like Intel's 82599 design when it comes to
8 * the fundamental clock design. However, the clock operations are much simpler
9 * in the XL710 because the device supports a full 64 bits of nanoseconds.
10 * Because the field is so wide, we can forgo the cycle counter and just
11 * operate with the nanosecond field directly without fear of overflow.
12 *
13 * Much like the 82599, the update period is dependent upon the link speed:
14 * At 40Gb, 25Gb, or no link, the period is 1.6ns.
15 * At 10Gb or 5Gb link, the period is multiplied by 2. (3.2ns)
16 * At 1Gb link, the period is multiplied by 20. (32ns)
17 * 1588 functionality is not supported at 100Mbps.
18 */
19#define I40E_PTP_40GB_INCVAL 0x0199999999ULL
20#define I40E_PTP_10GB_INCVAL_MULT 2
21#define I40E_PTP_5GB_INCVAL_MULT 2
22#define I40E_PTP_1GB_INCVAL_MULT 20
23
24#define I40E_PRTTSYN_CTL1_TSYNTYPE_V1 BIT(I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
25#define I40E_PRTTSYN_CTL1_TSYNTYPE_V2 (2 << \
26 I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
27
28/**
29 * i40e_ptp_read - Read the PHC time from the device
30 * @pf: Board private structure
31 * @ts: timespec structure to hold the current time value
32 * @sts: structure to hold the system time before and after reading the PHC
33 *
34 * This function reads the PRTTSYN_TIME registers and stores them in a
35 * timespec. However, since the registers are 64 bits of nanoseconds, we must
36 * convert the result to a timespec before we can return.
37 **/
38static void i40e_ptp_read(struct i40e_pf *pf, struct timespec64 *ts,
39 struct ptp_system_timestamp *sts)
40{
41 struct i40e_hw *hw = &pf->hw;
42 u32 hi, lo;
43 u64 ns;
44
45 /* The timer latches on the lowest register read. */
46 ptp_read_system_prets(sts);
47 lo = rd32(hw, I40E_PRTTSYN_TIME_L);
48 ptp_read_system_postts(sts);
49 hi = rd32(hw, I40E_PRTTSYN_TIME_H);
50
51 ns = (((u64)hi) << 32) | lo;
52
53 *ts = ns_to_timespec64(ns);
54}
55
56/**
57 * i40e_ptp_write - Write the PHC time to the device
58 * @pf: Board private structure
59 * @ts: timespec structure that holds the new time value
60 *
61 * This function writes the PRTTSYN_TIME registers with the user value. Since
62 * we receive a timespec from the stack, we must convert that timespec into
63 * nanoseconds before programming the registers.
64 **/
65static void i40e_ptp_write(struct i40e_pf *pf, const struct timespec64 *ts)
66{
67 struct i40e_hw *hw = &pf->hw;
68 u64 ns = timespec64_to_ns(ts);
69
70 /* The timer will not update until the high register is written, so
71 * write the low register first.
72 */
73 wr32(hw, I40E_PRTTSYN_TIME_L, ns & 0xFFFFFFFF);
74 wr32(hw, I40E_PRTTSYN_TIME_H, ns >> 32);
75}
76
77/**
78 * i40e_ptp_convert_to_hwtstamp - Convert device clock to system time
79 * @hwtstamps: Timestamp structure to update
80 * @timestamp: Timestamp from the hardware
81 *
82 * We need to convert the NIC clock value into a hwtstamp which can be used by
83 * the upper level timestamping functions. Since the timestamp is simply a 64-
84 * bit nanosecond value, we can call ns_to_ktime directly to handle this.
85 **/
86static void i40e_ptp_convert_to_hwtstamp(struct skb_shared_hwtstamps *hwtstamps,
87 u64 timestamp)
88{
89 memset(hwtstamps, 0, sizeof(*hwtstamps));
90
91 hwtstamps->hwtstamp = ns_to_ktime(timestamp);
92}
93
94/**
95 * i40e_ptp_adjfreq - Adjust the PHC frequency
96 * @ptp: The PTP clock structure
97 * @ppb: Parts per billion adjustment from the base
98 *
99 * Adjust the frequency of the PHC by the indicated parts per billion from the
100 * base frequency.
101 **/
102static int i40e_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
103{
104 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
105 struct i40e_hw *hw = &pf->hw;
106 u64 adj, freq, diff;
107 int neg_adj = 0;
108
109 if (ppb < 0) {
110 neg_adj = 1;
111 ppb = -ppb;
112 }
113
114 freq = I40E_PTP_40GB_INCVAL;
115 freq *= ppb;
116 diff = div_u64(freq, 1000000000ULL);
117
118 if (neg_adj)
119 adj = I40E_PTP_40GB_INCVAL - diff;
120 else
121 adj = I40E_PTP_40GB_INCVAL + diff;
122
123 /* At some link speeds, the base incval is so large that directly
124 * multiplying by ppb would result in arithmetic overflow even when
125 * using a u64. Avoid this by instead calculating the new incval
126 * always in terms of the 40GbE clock rate and then multiplying by the
127 * link speed factor afterwards. This does result in slightly lower
128 * precision at lower link speeds, but it is fairly minor.
129 */
130 smp_mb(); /* Force any pending update before accessing. */
131 adj *= READ_ONCE(pf->ptp_adj_mult);
132
133 wr32(hw, I40E_PRTTSYN_INC_L, adj & 0xFFFFFFFF);
134 wr32(hw, I40E_PRTTSYN_INC_H, adj >> 32);
135
136 return 0;
137}
138
139/**
140 * i40e_ptp_adjtime - Adjust the PHC time
141 * @ptp: The PTP clock structure
142 * @delta: Offset in nanoseconds to adjust the PHC time by
143 *
144 * Adjust the current clock time by a delta specified in nanoseconds.
145 **/
146static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
147{
148 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
149 struct timespec64 now, then;
150
151 then = ns_to_timespec64(delta);
152 mutex_lock(&pf->tmreg_lock);
153
154 i40e_ptp_read(pf, &now, NULL);
155 now = timespec64_add(now, then);
156 i40e_ptp_write(pf, (const struct timespec64 *)&now);
157
158 mutex_unlock(&pf->tmreg_lock);
159
160 return 0;
161}
162
163/**
164 * i40e_ptp_gettimex - Get the time of the PHC
165 * @ptp: The PTP clock structure
166 * @ts: timespec structure to hold the current time value
167 * @sts: structure to hold the system time before and after reading the PHC
168 *
169 * Read the device clock and return the correct value on ns, after converting it
170 * into a timespec struct.
171 **/
172static int i40e_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
173 struct ptp_system_timestamp *sts)
174{
175 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
176
177 mutex_lock(&pf->tmreg_lock);
178 i40e_ptp_read(pf, ts, sts);
179 mutex_unlock(&pf->tmreg_lock);
180
181 return 0;
182}
183
184/**
185 * i40e_ptp_settime - Set the time of the PHC
186 * @ptp: The PTP clock structure
187 * @ts: timespec structure that holds the new time value
188 *
189 * Set the device clock to the user input value. The conversion from timespec
190 * to ns happens in the write function.
191 **/
192static int i40e_ptp_settime(struct ptp_clock_info *ptp,
193 const struct timespec64 *ts)
194{
195 struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
196
197 mutex_lock(&pf->tmreg_lock);
198 i40e_ptp_write(pf, ts);
199 mutex_unlock(&pf->tmreg_lock);
200
201 return 0;
202}
203
204/**
205 * i40e_ptp_feature_enable - Enable/disable ancillary features of the PHC subsystem
206 * @ptp: The PTP clock structure
207 * @rq: The requested feature to change
208 * @on: Enable/disable flag
209 *
210 * The XL710 does not support any of the ancillary features of the PHC
211 * subsystem, so this function may just return.
212 **/
213static int i40e_ptp_feature_enable(struct ptp_clock_info *ptp,
214 struct ptp_clock_request *rq, int on)
215{
216 return -EOPNOTSUPP;
217}
218
219/**
220 * i40e_ptp_get_rx_events - Read I40E_PRTTSYN_STAT_1 and latch events
221 * @pf: the PF data structure
222 *
223 * This function reads I40E_PRTTSYN_STAT_1 and updates the corresponding timers
224 * for noticed latch events. This allows the driver to keep track of the first
225 * time a latch event was noticed which will be used to help clear out Rx
226 * timestamps for packets that got dropped or lost.
227 *
228 * This function will return the current value of I40E_PRTTSYN_STAT_1 and is
229 * expected to be called only while under the ptp_rx_lock.
230 **/
231static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf)
232{
233 struct i40e_hw *hw = &pf->hw;
234 u32 prttsyn_stat, new_latch_events;
235 int i;
236
237 prttsyn_stat = rd32(hw, I40E_PRTTSYN_STAT_1);
238 new_latch_events = prttsyn_stat & ~pf->latch_event_flags;
239
240 /* Update the jiffies time for any newly latched timestamp. This
241 * ensures that we store the time that we first discovered a timestamp
242 * was latched by the hardware. The service task will later determine
243 * if we should free the latch and drop that timestamp should too much
244 * time pass. This flow ensures that we only update jiffies for new
245 * events latched since the last time we checked, and not all events
246 * currently latched, so that the service task accounting remains
247 * accurate.
248 */
249 for (i = 0; i < 4; i++) {
250 if (new_latch_events & BIT(i))
251 pf->latch_events[i] = jiffies;
252 }
253
254 /* Finally, we store the current status of the Rx timestamp latches */
255 pf->latch_event_flags = prttsyn_stat;
256
257 return prttsyn_stat;
258}
259
260/**
261 * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
262 * @pf: The PF private data structure
263 *
264 * This watchdog task is scheduled to detect error case where hardware has
265 * dropped an Rx packet that was timestamped when the ring is full. The
266 * particular error is rare but leaves the device in a state unable to timestamp
267 * any future packets.
268 **/
269void i40e_ptp_rx_hang(struct i40e_pf *pf)
270{
271 struct i40e_hw *hw = &pf->hw;
272 unsigned int i, cleared = 0;
273
274 /* Since we cannot turn off the Rx timestamp logic if the device is
275 * configured for Tx timestamping, we check if Rx timestamping is
276 * configured. We don't want to spuriously warn about Rx timestamp
277 * hangs if we don't care about the timestamps.
278 */
279 if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
280 return;
281
282 spin_lock_bh(&pf->ptp_rx_lock);
283
284 /* Update current latch times for Rx events */
285 i40e_ptp_get_rx_events(pf);
286
287 /* Check all the currently latched Rx events and see whether they have
288 * been latched for over a second. It is assumed that any timestamp
289 * should have been cleared within this time, or else it was captured
290 * for a dropped frame that the driver never received. Thus, we will
291 * clear any timestamp that has been latched for over 1 second.
292 */
293 for (i = 0; i < 4; i++) {
294 if ((pf->latch_event_flags & BIT(i)) &&
295 time_is_before_jiffies(pf->latch_events[i] + HZ)) {
296 rd32(hw, I40E_PRTTSYN_RXTIME_H(i));
297 pf->latch_event_flags &= ~BIT(i);
298 cleared++;
299 }
300 }
301
302 spin_unlock_bh(&pf->ptp_rx_lock);
303
304 /* Log a warning if more than 2 timestamps got dropped in the same
305 * check. We don't want to warn about all drops because it can occur
306 * in normal scenarios such as PTP frames on multicast addresses we
307 * aren't listening to. However, administrator should know if this is
308 * the reason packets aren't receiving timestamps.
309 */
310 if (cleared > 2)
311 dev_dbg(&pf->pdev->dev,
312 "Dropped %d missed RXTIME timestamp events\n",
313 cleared);
314
315 /* Finally, update the rx_hwtstamp_cleared counter */
316 pf->rx_hwtstamp_cleared += cleared;
317}
318
319/**
320 * i40e_ptp_tx_hang - Detect error case when Tx timestamp register is hung
321 * @pf: The PF private data structure
322 *
323 * This watchdog task is run periodically to make sure that we clear the Tx
324 * timestamp logic if we don't obtain a timestamp in a reasonable amount of
325 * time. It is unexpected in the normal case but if it occurs it results in
326 * permanently preventing timestamps of future packets.
327 **/
328void i40e_ptp_tx_hang(struct i40e_pf *pf)
329{
330 struct sk_buff *skb;
331
332 if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
333 return;
334
335 /* Nothing to do if we're not already waiting for a timestamp */
336 if (!test_bit(__I40E_PTP_TX_IN_PROGRESS, pf->state))
337 return;
338
339 /* We already have a handler routine which is run when we are notified
340 * of a Tx timestamp in the hardware. If we don't get an interrupt
341 * within a second it is reasonable to assume that we never will.
342 */
343 if (time_is_before_jiffies(pf->ptp_tx_start + HZ)) {
344 skb = pf->ptp_tx_skb;
345 pf->ptp_tx_skb = NULL;
346 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
347
348 /* Free the skb after we clear the bitlock */
349 dev_kfree_skb_any(skb);
350 pf->tx_hwtstamp_timeouts++;
351 }
352}
353
354/**
355 * i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
356 * @pf: Board private structure
357 *
358 * Read the value of the Tx timestamp from the registers, convert it into a
359 * value consumable by the stack, and store that result into the shhwtstamps
360 * struct before returning it up the stack.
361 **/
362void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
363{
364 struct skb_shared_hwtstamps shhwtstamps;
365 struct sk_buff *skb = pf->ptp_tx_skb;
366 struct i40e_hw *hw = &pf->hw;
367 u32 hi, lo;
368 u64 ns;
369
370 if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
371 return;
372
373 /* don't attempt to timestamp if we don't have an skb */
374 if (!pf->ptp_tx_skb)
375 return;
376
377 lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
378 hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
379
380 ns = (((u64)hi) << 32) | lo;
381 i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
382
383 /* Clear the bit lock as soon as possible after reading the register,
384 * and prior to notifying the stack via skb_tstamp_tx(). Otherwise
385 * applications might wake up and attempt to request another transmit
386 * timestamp prior to the bit lock being cleared.
387 */
388 pf->ptp_tx_skb = NULL;
389 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
390
391 /* Notify the stack and free the skb after we've unlocked */
392 skb_tstamp_tx(skb, &shhwtstamps);
393 dev_kfree_skb_any(skb);
394}
395
396/**
397 * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
398 * @pf: Board private structure
399 * @skb: Particular skb to send timestamp with
400 * @index: Index into the receive timestamp registers for the timestamp
401 *
402 * The XL710 receives a notification in the receive descriptor with an offset
403 * into the set of RXTIME registers where the timestamp is for that skb. This
404 * function goes and fetches the receive timestamp from that offset, if a valid
405 * one exists. The RXTIME registers are in ns, so we must convert the result
406 * first.
407 **/
408void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
409{
410 u32 prttsyn_stat, hi, lo;
411 struct i40e_hw *hw;
412 u64 ns;
413
414 /* Since we cannot turn off the Rx timestamp logic if the device is
415 * doing Tx timestamping, check if Rx timestamping is configured.
416 */
417 if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
418 return;
419
420 hw = &pf->hw;
421
422 spin_lock_bh(&pf->ptp_rx_lock);
423
424 /* Get current Rx events and update latch times */
425 prttsyn_stat = i40e_ptp_get_rx_events(pf);
426
427 /* TODO: Should we warn about missing Rx timestamp event? */
428 if (!(prttsyn_stat & BIT(index))) {
429 spin_unlock_bh(&pf->ptp_rx_lock);
430 return;
431 }
432
433 /* Clear the latched event since we're about to read its register */
434 pf->latch_event_flags &= ~BIT(index);
435
436 lo = rd32(hw, I40E_PRTTSYN_RXTIME_L(index));
437 hi = rd32(hw, I40E_PRTTSYN_RXTIME_H(index));
438
439 spin_unlock_bh(&pf->ptp_rx_lock);
440
441 ns = (((u64)hi) << 32) | lo;
442
443 i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
444}
445
446/**
447 * i40e_ptp_set_increment - Utility function to update clock increment rate
448 * @pf: Board private structure
449 *
450 * During a link change, the DMA frequency that drives the 1588 logic will
451 * change. In order to keep the PRTTSYN_TIME registers in units of nanoseconds,
452 * we must update the increment value per clock tick.
453 **/
454void i40e_ptp_set_increment(struct i40e_pf *pf)
455{
456 struct i40e_link_status *hw_link_info;
457 struct i40e_hw *hw = &pf->hw;
458 u64 incval;
459 u32 mult;
460
461 hw_link_info = &hw->phy.link_info;
462
463 i40e_aq_get_link_info(&pf->hw, true, NULL, NULL);
464
465 switch (hw_link_info->link_speed) {
466 case I40E_LINK_SPEED_10GB:
467 mult = I40E_PTP_10GB_INCVAL_MULT;
468 break;
469 case I40E_LINK_SPEED_5GB:
470 mult = I40E_PTP_5GB_INCVAL_MULT;
471 break;
472 case I40E_LINK_SPEED_1GB:
473 mult = I40E_PTP_1GB_INCVAL_MULT;
474 break;
475 case I40E_LINK_SPEED_100MB:
476 {
477 static int warn_once;
478
479 if (!warn_once) {
480 dev_warn(&pf->pdev->dev,
481 "1588 functionality is not supported at 100 Mbps. Stopping the PHC.\n");
482 warn_once++;
483 }
484 mult = 0;
485 break;
486 }
487 case I40E_LINK_SPEED_40GB:
488 default:
489 mult = 1;
490 break;
491 }
492
493 /* The increment value is calculated by taking the base 40GbE incvalue
494 * and multiplying it by a factor based on the link speed.
495 */
496 incval = I40E_PTP_40GB_INCVAL * mult;
497
498 /* Write the new increment value into the increment register. The
499 * hardware will not update the clock until both registers have been
500 * written.
501 */
502 wr32(hw, I40E_PRTTSYN_INC_L, incval & 0xFFFFFFFF);
503 wr32(hw, I40E_PRTTSYN_INC_H, incval >> 32);
504
505 /* Update the base adjustement value. */
506 WRITE_ONCE(pf->ptp_adj_mult, mult);
507 smp_mb(); /* Force the above update. */
508}
509
510/**
511 * i40e_ptp_get_ts_config - ioctl interface to read the HW timestamping
512 * @pf: Board private structure
513 * @ifr: ioctl data
514 *
515 * Obtain the current hardware timestamping settigs as requested. To do this,
516 * keep a shadow copy of the timestamp settings rather than attempting to
517 * deconstruct it from the registers.
518 **/
519int i40e_ptp_get_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
520{
521 struct hwtstamp_config *config = &pf->tstamp_config;
522
523 if (!(pf->flags & I40E_FLAG_PTP))
524 return -EOPNOTSUPP;
525
526 return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
527 -EFAULT : 0;
528}
529
530/**
531 * i40e_ptp_set_timestamp_mode - setup hardware for requested timestamp mode
532 * @pf: Board private structure
533 * @config: hwtstamp settings requested or saved
534 *
535 * Control hardware registers to enter the specific mode requested by the
536 * user. Also used during reset path to ensure that timestamp settings are
537 * maintained.
538 *
539 * Note: modifies config in place, and may update the requested mode to be
540 * more broad if the specific filter is not directly supported.
541 **/
542static int i40e_ptp_set_timestamp_mode(struct i40e_pf *pf,
543 struct hwtstamp_config *config)
544{
545 struct i40e_hw *hw = &pf->hw;
546 u32 tsyntype, regval;
547
548 /* Reserved for future extensions. */
549 if (config->flags)
550 return -EINVAL;
551
552 switch (config->tx_type) {
553 case HWTSTAMP_TX_OFF:
554 pf->ptp_tx = false;
555 break;
556 case HWTSTAMP_TX_ON:
557 pf->ptp_tx = true;
558 break;
559 default:
560 return -ERANGE;
561 }
562
563 switch (config->rx_filter) {
564 case HWTSTAMP_FILTER_NONE:
565 pf->ptp_rx = false;
566 /* We set the type to V1, but do not enable UDP packet
567 * recognition. In this way, we should be as close to
568 * disabling PTP Rx timestamps as possible since V1 packets
569 * are always UDP, since L2 packets are a V2 feature.
570 */
571 tsyntype = I40E_PRTTSYN_CTL1_TSYNTYPE_V1;
572 break;
573 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
574 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
575 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
576 if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE))
577 return -ERANGE;
578 pf->ptp_rx = true;
579 tsyntype = I40E_PRTTSYN_CTL1_V1MESSTYPE0_MASK |
580 I40E_PRTTSYN_CTL1_TSYNTYPE_V1 |
581 I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
582 config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
583 break;
584 case HWTSTAMP_FILTER_PTP_V2_EVENT:
585 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
586 case HWTSTAMP_FILTER_PTP_V2_SYNC:
587 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
588 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
589 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
590 if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE))
591 return -ERANGE;
592 fallthrough;
593 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
594 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
595 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
596 pf->ptp_rx = true;
597 tsyntype = I40E_PRTTSYN_CTL1_V2MESSTYPE0_MASK |
598 I40E_PRTTSYN_CTL1_TSYNTYPE_V2;
599 if (pf->hw_features & I40E_HW_PTP_L4_CAPABLE) {
600 tsyntype |= I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
601 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
602 } else {
603 config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
604 }
605 break;
606 case HWTSTAMP_FILTER_NTP_ALL:
607 case HWTSTAMP_FILTER_ALL:
608 default:
609 return -ERANGE;
610 }
611
612 /* Clear out all 1588-related registers to clear and unlatch them. */
613 spin_lock_bh(&pf->ptp_rx_lock);
614 rd32(hw, I40E_PRTTSYN_STAT_0);
615 rd32(hw, I40E_PRTTSYN_TXTIME_H);
616 rd32(hw, I40E_PRTTSYN_RXTIME_H(0));
617 rd32(hw, I40E_PRTTSYN_RXTIME_H(1));
618 rd32(hw, I40E_PRTTSYN_RXTIME_H(2));
619 rd32(hw, I40E_PRTTSYN_RXTIME_H(3));
620 pf->latch_event_flags = 0;
621 spin_unlock_bh(&pf->ptp_rx_lock);
622
623 /* Enable/disable the Tx timestamp interrupt based on user input. */
624 regval = rd32(hw, I40E_PRTTSYN_CTL0);
625 if (pf->ptp_tx)
626 regval |= I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
627 else
628 regval &= ~I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
629 wr32(hw, I40E_PRTTSYN_CTL0, regval);
630
631 regval = rd32(hw, I40E_PFINT_ICR0_ENA);
632 if (pf->ptp_tx)
633 regval |= I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
634 else
635 regval &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
636 wr32(hw, I40E_PFINT_ICR0_ENA, regval);
637
638 /* Although there is no simple on/off switch for Rx, we "disable" Rx
639 * timestamps by setting to V1 only mode and clear the UDP
640 * recognition. This ought to disable all PTP Rx timestamps as V1
641 * packets are always over UDP. Note that software is configured to
642 * ignore Rx timestamps via the pf->ptp_rx flag.
643 */
644 regval = rd32(hw, I40E_PRTTSYN_CTL1);
645 /* clear everything but the enable bit */
646 regval &= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
647 /* now enable bits for desired Rx timestamps */
648 regval |= tsyntype;
649 wr32(hw, I40E_PRTTSYN_CTL1, regval);
650
651 return 0;
652}
653
654/**
655 * i40e_ptp_set_ts_config - ioctl interface to control the HW timestamping
656 * @pf: Board private structure
657 * @ifr: ioctl data
658 *
659 * Respond to the user filter requests and make the appropriate hardware
660 * changes here. The XL710 cannot support splitting of the Tx/Rx timestamping
661 * logic, so keep track in software of whether to indicate these timestamps
662 * or not.
663 *
664 * It is permissible to "upgrade" the user request to a broader filter, as long
665 * as the user receives the timestamps they care about and the user is notified
666 * the filter has been broadened.
667 **/
668int i40e_ptp_set_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
669{
670 struct hwtstamp_config config;
671 int err;
672
673 if (!(pf->flags & I40E_FLAG_PTP))
674 return -EOPNOTSUPP;
675
676 if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
677 return -EFAULT;
678
679 err = i40e_ptp_set_timestamp_mode(pf, &config);
680 if (err)
681 return err;
682
683 /* save these settings for future reference */
684 pf->tstamp_config = config;
685
686 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
687 -EFAULT : 0;
688}
689
690/**
691 * i40e_ptp_create_clock - Create PTP clock device for userspace
692 * @pf: Board private structure
693 *
694 * This function creates a new PTP clock device. It only creates one if we
695 * don't already have one, so it is safe to call. Will return error if it
696 * can't create one, but success if we already have a device. Should be used
697 * by i40e_ptp_init to create clock initially, and prevent global resets from
698 * creating new clock devices.
699 **/
700static long i40e_ptp_create_clock(struct i40e_pf *pf)
701{
702 /* no need to create a clock device if we already have one */
703 if (!IS_ERR_OR_NULL(pf->ptp_clock))
704 return 0;
705
706 strlcpy(pf->ptp_caps.name, i40e_driver_name,
707 sizeof(pf->ptp_caps.name) - 1);
708 pf->ptp_caps.owner = THIS_MODULE;
709 pf->ptp_caps.max_adj = 999999999;
710 pf->ptp_caps.n_ext_ts = 0;
711 pf->ptp_caps.pps = 0;
712 pf->ptp_caps.adjfreq = i40e_ptp_adjfreq;
713 pf->ptp_caps.adjtime = i40e_ptp_adjtime;
714 pf->ptp_caps.gettimex64 = i40e_ptp_gettimex;
715 pf->ptp_caps.settime64 = i40e_ptp_settime;
716 pf->ptp_caps.enable = i40e_ptp_feature_enable;
717
718 /* Attempt to register the clock before enabling the hardware. */
719 pf->ptp_clock = ptp_clock_register(&pf->ptp_caps, &pf->pdev->dev);
720 if (IS_ERR(pf->ptp_clock))
721 return PTR_ERR(pf->ptp_clock);
722
723 /* clear the hwtstamp settings here during clock create, instead of
724 * during regular init, so that we can maintain settings across a
725 * reset or suspend.
726 */
727 pf->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
728 pf->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
729
730 /* Set the previous "reset" time to the current Kernel clock time */
731 ktime_get_real_ts64(&pf->ptp_prev_hw_time);
732 pf->ptp_reset_start = ktime_get();
733
734 return 0;
735}
736
737/**
738 * i40e_ptp_save_hw_time - Save the current PTP time as ptp_prev_hw_time
739 * @pf: Board private structure
740 *
741 * Read the current PTP time and save it into pf->ptp_prev_hw_time. This should
742 * be called at the end of preparing to reset, just before hardware reset
743 * occurs, in order to preserve the PTP time as close as possible across
744 * resets.
745 */
746void i40e_ptp_save_hw_time(struct i40e_pf *pf)
747{
748 /* don't try to access the PTP clock if it's not enabled */
749 if (!(pf->flags & I40E_FLAG_PTP))
750 return;
751
752 i40e_ptp_gettimex(&pf->ptp_caps, &pf->ptp_prev_hw_time, NULL);
753 /* Get a monotonic starting time for this reset */
754 pf->ptp_reset_start = ktime_get();
755}
756
757/**
758 * i40e_ptp_restore_hw_time - Restore the ptp_prev_hw_time + delta to PTP regs
759 * @pf: Board private structure
760 *
761 * Restore the PTP hardware clock registers. We previously cached the PTP
762 * hardware time as pf->ptp_prev_hw_time. To be as accurate as possible,
763 * update this value based on the time delta since the time was saved, using
764 * CLOCK_MONOTONIC (via ktime_get()) to calculate the time difference.
765 *
766 * This ensures that the hardware clock is restored to nearly what it should
767 * have been if a reset had not occurred.
768 */
769void i40e_ptp_restore_hw_time(struct i40e_pf *pf)
770{
771 ktime_t delta = ktime_sub(ktime_get(), pf->ptp_reset_start);
772
773 /* Update the previous HW time with the ktime delta */
774 timespec64_add_ns(&pf->ptp_prev_hw_time, ktime_to_ns(delta));
775
776 /* Restore the hardware clock registers */
777 i40e_ptp_settime(&pf->ptp_caps, &pf->ptp_prev_hw_time);
778}
779
780/**
781 * i40e_ptp_init - Initialize the 1588 support after device probe or reset
782 * @pf: Board private structure
783 *
784 * This function sets device up for 1588 support. The first time it is run, it
785 * will create a PHC clock device. It does not create a clock device if one
786 * already exists. It also reconfigures the device after a reset.
787 *
788 * The first time a clock is created, i40e_ptp_create_clock will set
789 * pf->ptp_prev_hw_time to the current system time. During resets, it is
790 * expected that this timespec will be set to the last known PTP clock time,
791 * in order to preserve the clock time as close as possible across a reset.
792 **/
793void i40e_ptp_init(struct i40e_pf *pf)
794{
795 struct net_device *netdev = pf->vsi[pf->lan_vsi]->netdev;
796 struct i40e_hw *hw = &pf->hw;
797 u32 pf_id;
798 long err;
799
800 /* Only one PF is assigned to control 1588 logic per port. Do not
801 * enable any support for PFs not assigned via PRTTSYN_CTL0.PF_ID
802 */
803 pf_id = (rd32(hw, I40E_PRTTSYN_CTL0) & I40E_PRTTSYN_CTL0_PF_ID_MASK) >>
804 I40E_PRTTSYN_CTL0_PF_ID_SHIFT;
805 if (hw->pf_id != pf_id) {
806 pf->flags &= ~I40E_FLAG_PTP;
807 dev_info(&pf->pdev->dev, "%s: PTP not supported on %s\n",
808 __func__,
809 netdev->name);
810 return;
811 }
812
813 mutex_init(&pf->tmreg_lock);
814 spin_lock_init(&pf->ptp_rx_lock);
815
816 /* ensure we have a clock device */
817 err = i40e_ptp_create_clock(pf);
818 if (err) {
819 pf->ptp_clock = NULL;
820 dev_err(&pf->pdev->dev, "%s: ptp_clock_register failed\n",
821 __func__);
822 } else if (pf->ptp_clock) {
823 u32 regval;
824
825 if (pf->hw.debug_mask & I40E_DEBUG_LAN)
826 dev_info(&pf->pdev->dev, "PHC enabled\n");
827 pf->flags |= I40E_FLAG_PTP;
828
829 /* Ensure the clocks are running. */
830 regval = rd32(hw, I40E_PRTTSYN_CTL0);
831 regval |= I40E_PRTTSYN_CTL0_TSYNENA_MASK;
832 wr32(hw, I40E_PRTTSYN_CTL0, regval);
833 regval = rd32(hw, I40E_PRTTSYN_CTL1);
834 regval |= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
835 wr32(hw, I40E_PRTTSYN_CTL1, regval);
836
837 /* Set the increment value per clock tick. */
838 i40e_ptp_set_increment(pf);
839
840 /* reset timestamping mode */
841 i40e_ptp_set_timestamp_mode(pf, &pf->tstamp_config);
842
843 /* Restore the clock time based on last known value */
844 i40e_ptp_restore_hw_time(pf);
845 }
846}
847
848/**
849 * i40e_ptp_stop - Disable the driver/hardware support and unregister the PHC
850 * @pf: Board private structure
851 *
852 * This function handles the cleanup work required from the initialization by
853 * clearing out the important information and unregistering the PHC.
854 **/
855void i40e_ptp_stop(struct i40e_pf *pf)
856{
857 pf->flags &= ~I40E_FLAG_PTP;
858 pf->ptp_tx = false;
859 pf->ptp_rx = false;
860
861 if (pf->ptp_tx_skb) {
862 struct sk_buff *skb = pf->ptp_tx_skb;
863
864 pf->ptp_tx_skb = NULL;
865 clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
866 dev_kfree_skb_any(skb);
867 }
868
869 if (pf->ptp_clock) {
870 ptp_clock_unregister(pf->ptp_clock);
871 pf->ptp_clock = NULL;
872 dev_info(&pf->pdev->dev, "%s: removed PHC on %s\n", __func__,
873 pf->vsi[pf->lan_vsi]->netdev->name);
874 }
875}