1 /*******************************************************************************
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2012 Intel Corporation.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
23 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *******************************************************************************/
28 #include <linux/export.h>
29 #include <linux/ptp_classify.h>
32 * The 82599 and the X540 do not have true 64bit nanosecond scale
33 * counter registers. Instead, SYSTIME is defined by a fixed point
34 * system which allows the user to define the scale counter increment
35 * value at every level change of the oscillator driving the SYSTIME
36 * value. For both devices the TIMINCA:IV field defines this
37 * increment. On the X540 device, 31 bits are provided. However on the
38 * 82599 only provides 24 bits. The time unit is determined by the
39 * clock frequency of the oscillator in combination with the TIMINCA
40 * register. When these devices link at 10Gb the oscillator has a
41 * period of 6.4ns. In order to convert the scale counter into
42 * nanoseconds the cyclecounter and timecounter structures are
43 * used. The SYSTIME registers need to be converted to ns values by use
44 * of only a right shift (division by power of 2). The following math
45 * determines the largest incvalue that will fit into the available
46 * bits in the TIMINCA register.
48 * PeriodWidth: Number of bits to store the clock period
49 * MaxWidth: The maximum width value of the TIMINCA register
50 * Period: The clock period for the oscillator
51 * round(): discard the fractional portion of the calculation
53 * Period * [ 2 ^ ( MaxWidth - PeriodWidth ) ]
55 * For the X540, MaxWidth is 31 bits, and the base period is 6.4 ns
56 * For the 82599, MaxWidth is 24 bits, and the base period is 6.4 ns
58 * The period also changes based on the link speed:
59 * At 10Gb link or no link, the period remains the same.
60 * At 1Gb link, the period is multiplied by 10. (64ns)
61 * At 100Mb link, the period is multiplied by 100. (640ns)
63 * The calculated value allows us to right shift the SYSTIME register
64 * value in order to quickly convert it into a nanosecond clock,
65 * while allowing for the maximum possible adjustment value.
67 * These diagrams are only for the 10Gb link period
70 * +--------------+ +--------------+
71 * X540 | 32 | | 1 | 3 | 28 |
72 * *--------------+ +--------------+
73 * \________ 36 bits ______/ fract
75 * +--------------+ +--------------+
76 * 82599 | 32 | | 8 | 3 | 21 |
77 * *--------------+ +--------------+
78 * \________ 43 bits ______/ fract
80 * The 36 bit X540 SYSTIME overflows every
81 * 2^36 * 10^-9 / 60 = 1.14 minutes or 69 seconds
83 * The 43 bit 82599 SYSTIME overflows every
84 * 2^43 * 10^-9 / 3600 = 2.4 hours
86 #define IXGBE_INCVAL_10GB 0x66666666
87 #define IXGBE_INCVAL_1GB 0x40000000
88 #define IXGBE_INCVAL_100 0x50000000
90 #define IXGBE_INCVAL_SHIFT_10GB 28
91 #define IXGBE_INCVAL_SHIFT_1GB 24
92 #define IXGBE_INCVAL_SHIFT_100 21
94 #define IXGBE_INCVAL_SHIFT_82599 7
95 #define IXGBE_INCPER_SHIFT_82599 24
96 #define IXGBE_MAX_TIMEADJ_VALUE 0x7FFFFFFFFFFFFFFFULL
98 #define IXGBE_OVERFLOW_PERIOD (HZ * 30)
100 #ifndef NSECS_PER_SEC
101 #define NSECS_PER_SEC 1000000000ULL
104 static struct sock_filter ptp_filter
[] = {
109 * ixgbe_ptp_setup_sdp
110 * @hw: the hardware private structure
112 * this function enables or disables the clock out feature on SDP0 for
113 * the X540 device. It will create a 1second periodic output that can
114 * be used as the PPS (via an interrupt).
116 * It calculates when the systime will be on an exact second, and then
117 * aligns the start of the PPS signal to that value. The shift is
118 * necessary because it can change based on the link speed.
120 static void ixgbe_ptp_setup_sdp(struct ixgbe_adapter
*adapter
)
122 struct ixgbe_hw
*hw
= &adapter
->hw
;
123 int shift
= adapter
->cc
.shift
;
124 u32 esdp
, tsauxc
, clktiml
, clktimh
, trgttiml
, trgttimh
, rem
;
125 u64 ns
= 0, clock_edge
= 0;
127 if ((adapter
->flags2
& IXGBE_FLAG2_PTP_PPS_ENABLED
) &&
128 (hw
->mac
.type
== ixgbe_mac_X540
)) {
130 /* disable the pin first */
131 IXGBE_WRITE_REG(hw
, IXGBE_TSAUXC
, 0x0);
132 IXGBE_WRITE_FLUSH(hw
);
134 esdp
= IXGBE_READ_REG(hw
, IXGBE_ESDP
);
137 * enable the SDP0 pin as output, and connected to the
138 * native function for Timesync (ClockOut)
140 esdp
|= (IXGBE_ESDP_SDP0_DIR
|
141 IXGBE_ESDP_SDP0_NATIVE
);
144 * enable the Clock Out feature on SDP0, and allow
145 * interrupts to occur when the pin changes
147 tsauxc
= (IXGBE_TSAUXC_EN_CLK
|
148 IXGBE_TSAUXC_SYNCLK
|
149 IXGBE_TSAUXC_SDP0_INT
);
151 /* clock period (or pulse length) */
152 clktiml
= (u32
)(NSECS_PER_SEC
<< shift
);
153 clktimh
= (u32
)((NSECS_PER_SEC
<< shift
) >> 32);
156 * Account for the cyclecounter wrap-around value by
157 * using the converted ns value of the current time to
158 * check for when the next aligned second would occur.
160 clock_edge
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_SYSTIML
);
161 clock_edge
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_SYSTIMH
) << 32;
162 ns
= timecounter_cyc2time(&adapter
->tc
, clock_edge
);
164 div_u64_rem(ns
, NSECS_PER_SEC
, &rem
);
165 clock_edge
+= ((NSECS_PER_SEC
- (u64
)rem
) << shift
);
167 /* specify the initial clock start time */
168 trgttiml
= (u32
)clock_edge
;
169 trgttimh
= (u32
)(clock_edge
>> 32);
171 IXGBE_WRITE_REG(hw
, IXGBE_CLKTIML
, clktiml
);
172 IXGBE_WRITE_REG(hw
, IXGBE_CLKTIMH
, clktimh
);
173 IXGBE_WRITE_REG(hw
, IXGBE_TRGTTIML0
, trgttiml
);
174 IXGBE_WRITE_REG(hw
, IXGBE_TRGTTIMH0
, trgttimh
);
176 IXGBE_WRITE_REG(hw
, IXGBE_ESDP
, esdp
);
177 IXGBE_WRITE_REG(hw
, IXGBE_TSAUXC
, tsauxc
);
179 IXGBE_WRITE_REG(hw
, IXGBE_TSAUXC
, 0x0);
182 IXGBE_WRITE_FLUSH(hw
);
186 * ixgbe_ptp_read - read raw cycle counter (to be used by time counter)
187 * @cc: the cyclecounter structure
189 * this function reads the cyclecounter registers and is called by the
190 * cyclecounter structure used to construct a ns counter from the
191 * arbitrary fixed point registers
193 static cycle_t
ixgbe_ptp_read(const struct cyclecounter
*cc
)
195 struct ixgbe_adapter
*adapter
=
196 container_of(cc
, struct ixgbe_adapter
, cc
);
197 struct ixgbe_hw
*hw
= &adapter
->hw
;
200 stamp
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_SYSTIML
);
201 stamp
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_SYSTIMH
) << 32;
208 * @ptp: the ptp clock structure
209 * @ppb: parts per billion adjustment from base
211 * adjust the frequency of the ptp cycle counter by the
212 * indicated ppb from the base frequency.
214 static int ixgbe_ptp_adjfreq(struct ptp_clock_info
*ptp
, s32 ppb
)
216 struct ixgbe_adapter
*adapter
=
217 container_of(ptp
, struct ixgbe_adapter
, ptp_caps
);
218 struct ixgbe_hw
*hw
= &adapter
->hw
;
229 incval
= ACCESS_ONCE(adapter
->base_incval
);
233 diff
= div_u64(freq
, 1000000000ULL);
235 incval
= neg_adj
? (incval
- diff
) : (incval
+ diff
);
237 switch (hw
->mac
.type
) {
239 IXGBE_WRITE_REG(hw
, IXGBE_TIMINCA
, incval
);
241 case ixgbe_mac_82599EB
:
242 IXGBE_WRITE_REG(hw
, IXGBE_TIMINCA
,
243 (1 << IXGBE_INCPER_SHIFT_82599
) |
255 * @ptp: the ptp clock structure
256 * @delta: offset to adjust the cycle counter by
258 * adjust the timer by resetting the timecounter structure.
260 static int ixgbe_ptp_adjtime(struct ptp_clock_info
*ptp
, s64 delta
)
262 struct ixgbe_adapter
*adapter
=
263 container_of(ptp
, struct ixgbe_adapter
, ptp_caps
);
267 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
269 now
= timecounter_read(&adapter
->tc
);
272 /* reset the timecounter */
273 timecounter_init(&adapter
->tc
,
277 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
279 ixgbe_ptp_setup_sdp(adapter
);
286 * @ptp: the ptp clock structure
287 * @ts: timespec structure to hold the current time value
289 * read the timecounter and return the correct value on ns,
290 * after converting it into a struct timespec.
292 static int ixgbe_ptp_gettime(struct ptp_clock_info
*ptp
, struct timespec
*ts
)
294 struct ixgbe_adapter
*adapter
=
295 container_of(ptp
, struct ixgbe_adapter
, ptp_caps
);
300 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
301 ns
= timecounter_read(&adapter
->tc
);
302 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
304 ts
->tv_sec
= div_u64_rem(ns
, 1000000000ULL, &remainder
);
305 ts
->tv_nsec
= remainder
;
312 * @ptp: the ptp clock structure
313 * @ts: the timespec containing the new time for the cycle counter
315 * reset the timecounter to use a new base value instead of the kernel
318 static int ixgbe_ptp_settime(struct ptp_clock_info
*ptp
,
319 const struct timespec
*ts
)
321 struct ixgbe_adapter
*adapter
=
322 container_of(ptp
, struct ixgbe_adapter
, ptp_caps
);
326 ns
= ts
->tv_sec
* 1000000000ULL;
329 /* reset the timecounter */
330 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
331 timecounter_init(&adapter
->tc
, &adapter
->cc
, ns
);
332 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
334 ixgbe_ptp_setup_sdp(adapter
);
340 * @ptp: the ptp clock structure
341 * @rq: the requested feature to change
342 * @on: whether to enable or disable the feature
344 * enable (or disable) ancillary features of the phc subsystem.
345 * our driver only supports the PPS feature on the X540
347 static int ixgbe_ptp_enable(struct ptp_clock_info
*ptp
,
348 struct ptp_clock_request
*rq
, int on
)
350 struct ixgbe_adapter
*adapter
=
351 container_of(ptp
, struct ixgbe_adapter
, ptp_caps
);
354 * When PPS is enabled, unmask the interrupt for the ClockOut
355 * feature, so that the interrupt handler can send the PPS
356 * event when the clock SDP triggers. Clear mask when PPS is
359 if (rq
->type
== PTP_CLK_REQ_PPS
) {
360 switch (adapter
->hw
.mac
.type
) {
363 adapter
->flags2
|= IXGBE_FLAG2_PTP_PPS_ENABLED
;
365 adapter
->flags2
&= ~IXGBE_FLAG2_PTP_PPS_ENABLED
;
367 ixgbe_ptp_setup_sdp(adapter
);
378 * ixgbe_ptp_check_pps_event
379 * @adapter: the private adapter structure
380 * @eicr: the interrupt cause register value
382 * This function is called by the interrupt routine when checking for
383 * interrupts. It will check and handle a pps event.
385 void ixgbe_ptp_check_pps_event(struct ixgbe_adapter
*adapter
, u32 eicr
)
387 struct ixgbe_hw
*hw
= &adapter
->hw
;
388 struct ptp_clock_event event
;
390 event
.type
= PTP_CLOCK_PPS
;
392 /* this check is necessary in case the interrupt was enabled via some
393 * alternative means (ex. debug_fs). Better to check here than
394 * everywhere that calls this function.
396 if (!adapter
->ptp_clock
)
399 switch (hw
->mac
.type
) {
401 ptp_clock_event(adapter
->ptp_clock
, &event
);
410 * ixgbe_ptp_overflow_check - delayed work to detect SYSTIME overflow
411 * @work: structure containing information about this work task
413 * this work function is scheduled to continue reading the timecounter
414 * in order to prevent missing when the system time registers wrap
415 * around. This needs to be run approximately twice a minute when no
416 * PTP activity is occurring.
418 void ixgbe_ptp_overflow_check(struct ixgbe_adapter
*adapter
)
420 unsigned long elapsed_jiffies
= adapter
->last_overflow_check
- jiffies
;
423 if ((adapter
->flags2
& IXGBE_FLAG2_PTP_ENABLED
) &&
424 (elapsed_jiffies
>= IXGBE_OVERFLOW_PERIOD
)) {
425 ixgbe_ptp_gettime(&adapter
->ptp_caps
, &ts
);
426 adapter
->last_overflow_check
= jiffies
;
431 * ixgbe_ptp_match - determine if this skb matches a ptp packet
432 * @skb: pointer to the skb
433 * @hwtstamp: pointer to the hwtstamp_config to check
435 * Determine whether the skb should have been timestamped, assuming the
436 * hwtstamp was set via the hwtstamp ioctl. Returns non-zero when the packet
437 * should have a timestamp waiting in the registers, and 0 otherwise.
439 * V1 packets have to check the version type to determine whether they are
440 * correct. However, we can't directly access the data because it might be
441 * fragmented in the SKB, in paged memory. In order to work around this, we
442 * use skb_copy_bits which will properly copy the data whether it is in the
443 * paged memory fragments or not. We have to copy the IP header as well as the
446 static int ixgbe_ptp_match(struct sk_buff
*skb
, int rx_filter
)
450 unsigned int type
, offset
;
452 if (rx_filter
== HWTSTAMP_FILTER_NONE
)
455 type
= sk_run_filter(skb
, ptp_filter
);
457 if (likely(rx_filter
== HWTSTAMP_FILTER_PTP_V2_EVENT
))
458 return type
& PTP_CLASS_V2
;
460 /* For the remaining cases actually check message type */
462 case PTP_CLASS_V1_IPV4
:
463 skb_copy_bits(skb
, OFF_IHL
, &iph
, sizeof(iph
));
464 offset
= ETH_HLEN
+ (iph
.ihl
<< 2) + UDP_HLEN
+ OFF_PTP_CONTROL
;
466 case PTP_CLASS_V1_IPV6
:
467 offset
= OFF_PTP6
+ OFF_PTP_CONTROL
;
470 /* other cases invalid or handled above */
474 /* Make sure our buffer is long enough */
475 if (skb
->len
< offset
)
478 skb_copy_bits(skb
, offset
, &msgtype
, sizeof(msgtype
));
481 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
482 return (msgtype
== IXGBE_RXMTRL_V1_SYNC_MSG
);
484 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
485 return (msgtype
== IXGBE_RXMTRL_V1_DELAY_REQ_MSG
);
493 * ixgbe_ptp_tx_hwtstamp - utility function which checks for TX time stamp
494 * @q_vector: structure containing interrupt and ring information
495 * @skb: particular skb to send timestamp with
497 * if the timestamp is valid, we convert it into the timecounter ns
498 * value, then store that result into the shhwtstamps structure which
499 * is passed up the network stack
501 void ixgbe_ptp_tx_hwtstamp(struct ixgbe_q_vector
*q_vector
,
504 struct ixgbe_adapter
*adapter
;
506 struct skb_shared_hwtstamps shhwtstamps
;
511 /* we cannot process timestamps on a ring without a q_vector */
512 if (!q_vector
|| !q_vector
->adapter
)
515 adapter
= q_vector
->adapter
;
518 tsynctxctl
= IXGBE_READ_REG(hw
, IXGBE_TSYNCTXCTL
);
519 regval
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_TXSTMPL
);
520 regval
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_TXSTMPH
) << 32;
523 * if TX timestamp is not valid, exit after clearing the
524 * timestamp registers
526 if (!(tsynctxctl
& IXGBE_TSYNCTXCTL_VALID
))
529 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
530 ns
= timecounter_cyc2time(&adapter
->tc
, regval
);
531 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
533 memset(&shhwtstamps
, 0, sizeof(shhwtstamps
));
534 shhwtstamps
.hwtstamp
= ns_to_ktime(ns
);
535 skb_tstamp_tx(skb
, &shhwtstamps
);
539 * ixgbe_ptp_rx_hwtstamp - utility function which checks for RX time stamp
540 * @q_vector: structure containing interrupt and ring information
541 * @rx_desc: the rx descriptor
542 * @skb: particular skb to send timestamp with
544 * if the timestamp is valid, we convert it into the timecounter ns
545 * value, then store that result into the shhwtstamps structure which
546 * is passed up the network stack
548 void ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector
*q_vector
,
549 union ixgbe_adv_rx_desc
*rx_desc
,
552 struct ixgbe_adapter
*adapter
;
554 struct skb_shared_hwtstamps
*shhwtstamps
;
559 /* we cannot process timestamps on a ring without a q_vector */
560 if (!q_vector
|| !q_vector
->adapter
)
563 adapter
= q_vector
->adapter
;
566 if (likely(!ixgbe_ptp_match(skb
, adapter
->rx_hwtstamp_filter
)))
569 tsyncrxctl
= IXGBE_READ_REG(hw
, IXGBE_TSYNCRXCTL
);
571 /* Check if we have a valid timestamp and make sure the skb should
572 * have been timestamped */
573 if (!(tsyncrxctl
& IXGBE_TSYNCRXCTL_VALID
))
577 * Always read the registers, in order to clear a possible fault
578 * because of stagnant RX timestamp values for a packet that never
581 regval
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_RXSTMPL
);
582 regval
|= (u64
)IXGBE_READ_REG(hw
, IXGBE_RXSTMPH
) << 32;
585 * If the timestamp bit is set in the packet's descriptor, we know the
586 * timestamp belongs to this packet. No other packet can be
587 * timestamped until the registers for timestamping have been read.
588 * Therefor only one packet with this bit can be in the queue at a
589 * time, and the rx timestamp values that were in the registers belong
592 * If nothing went wrong, then it should have a skb_shared_tx that we
593 * can turn into a skb_shared_hwtstamps.
595 if (unlikely(!ixgbe_test_staterr(rx_desc
, IXGBE_RXDADV_STAT_TS
)))
598 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
599 ns
= timecounter_cyc2time(&adapter
->tc
, regval
);
600 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
602 shhwtstamps
= skb_hwtstamps(skb
);
603 shhwtstamps
->hwtstamp
= ns_to_ktime(ns
);
607 * ixgbe_ptp_hwtstamp_ioctl - control hardware time stamping
608 * @adapter: pointer to adapter struct
610 * @cmd: particular ioctl requested
612 * Outgoing time stamping can be enabled and disabled. Play nice and
613 * disable it when requested, although it shouldn't case any overhead
614 * when no packet needs it. At most one packet in the queue may be
615 * marked for time stamping, otherwise it would be impossible to tell
616 * for sure to which packet the hardware time stamp belongs.
618 * Incoming time stamping has to be configured via the hardware
619 * filters. Not all combinations are supported, in particular event
620 * type has to be specified. Matching the kind of event packet is
621 * not supported, with the exception of "all V2 events regardless of
624 * Since hardware always timestamps Path delay packets when timestamping V2
625 * packets, regardless of the type specified in the register, only use V2
626 * Event mode. This more accurately tells the user what the hardware is going
629 int ixgbe_ptp_hwtstamp_ioctl(struct ixgbe_adapter
*adapter
,
630 struct ifreq
*ifr
, int cmd
)
632 struct ixgbe_hw
*hw
= &adapter
->hw
;
633 struct hwtstamp_config config
;
634 u32 tsync_tx_ctl
= IXGBE_TSYNCTXCTL_ENABLED
;
635 u32 tsync_rx_ctl
= IXGBE_TSYNCRXCTL_ENABLED
;
636 u32 tsync_rx_mtrl
= PTP_EV_PORT
<< 16;
640 if (copy_from_user(&config
, ifr
->ifr_data
, sizeof(config
)))
643 /* reserved for future extensions */
647 switch (config
.tx_type
) {
648 case HWTSTAMP_TX_OFF
:
656 switch (config
.rx_filter
) {
657 case HWTSTAMP_FILTER_NONE
:
661 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
662 tsync_rx_ctl
|= IXGBE_TSYNCRXCTL_TYPE_L4_V1
;
663 tsync_rx_mtrl
= IXGBE_RXMTRL_V1_SYNC_MSG
;
665 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
666 tsync_rx_ctl
|= IXGBE_TSYNCRXCTL_TYPE_L4_V1
;
667 tsync_rx_mtrl
= IXGBE_RXMTRL_V1_DELAY_REQ_MSG
;
669 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
670 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
671 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
672 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
673 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
674 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
675 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
676 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
677 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
678 tsync_rx_ctl
|= IXGBE_TSYNCRXCTL_TYPE_EVENT_V2
;
680 config
.rx_filter
= HWTSTAMP_FILTER_PTP_V2_EVENT
;
682 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
683 case HWTSTAMP_FILTER_ALL
:
686 * register RXMTRL must be set in order to do V1 packets,
687 * therefore it is not possible to time stamp both V1 Sync and
688 * Delay_Req messages and hardware does not support
689 * timestamping all packets => return error
691 config
.rx_filter
= HWTSTAMP_FILTER_NONE
;
695 if (hw
->mac
.type
== ixgbe_mac_82598EB
) {
696 if (tsync_rx_ctl
| tsync_tx_ctl
)
701 /* Store filter value for later use */
702 adapter
->rx_hwtstamp_filter
= config
.rx_filter
;
704 /* define ethertype filter for timestamping L2 packets */
706 IXGBE_WRITE_REG(hw
, IXGBE_ETQF(IXGBE_ETQF_FILTER_1588
),
707 (IXGBE_ETQF_FILTER_EN
| /* enable filter */
708 IXGBE_ETQF_1588
| /* enable timestamping */
709 ETH_P_1588
)); /* 1588 eth protocol type */
711 IXGBE_WRITE_REG(hw
, IXGBE_ETQF(IXGBE_ETQF_FILTER_1588
), 0);
714 /* enable/disable TX */
715 regval
= IXGBE_READ_REG(hw
, IXGBE_TSYNCTXCTL
);
716 regval
&= ~IXGBE_TSYNCTXCTL_ENABLED
;
717 regval
|= tsync_tx_ctl
;
718 IXGBE_WRITE_REG(hw
, IXGBE_TSYNCTXCTL
, regval
);
720 /* enable/disable RX */
721 regval
= IXGBE_READ_REG(hw
, IXGBE_TSYNCRXCTL
);
722 regval
&= ~(IXGBE_TSYNCRXCTL_ENABLED
| IXGBE_TSYNCRXCTL_TYPE_MASK
);
723 regval
|= tsync_rx_ctl
;
724 IXGBE_WRITE_REG(hw
, IXGBE_TSYNCRXCTL
, regval
);
726 /* define which PTP packets are time stamped */
727 IXGBE_WRITE_REG(hw
, IXGBE_RXMTRL
, tsync_rx_mtrl
);
729 IXGBE_WRITE_FLUSH(hw
);
731 /* clear TX/RX time stamp registers, just to be sure */
732 regval
= IXGBE_READ_REG(hw
, IXGBE_TXSTMPH
);
733 regval
= IXGBE_READ_REG(hw
, IXGBE_RXSTMPH
);
735 return copy_to_user(ifr
->ifr_data
, &config
, sizeof(config
)) ?
740 * ixgbe_ptp_start_cyclecounter - create the cycle counter from hw
741 * @adapter: pointer to the adapter structure
743 * This function should be called to set the proper values for the TIMINCA
744 * register and tell the cyclecounter structure what the tick rate of SYSTIME
745 * is. It does not directly modify SYSTIME registers or the timecounter
746 * structure. It should be called whenever a new TIMINCA value is necessary,
747 * such as during initialization or when the link speed changes.
749 void ixgbe_ptp_start_cyclecounter(struct ixgbe_adapter
*adapter
)
751 struct ixgbe_hw
*hw
= &adapter
->hw
;
757 * Scale the NIC cycle counter by a large factor so that
758 * relatively small corrections to the frequency can be added
759 * or subtracted. The drawbacks of a large factor include
760 * (a) the clock register overflows more quickly, (b) the cycle
761 * counter structure must be able to convert the systime value
762 * to nanoseconds using only a multiplier and a right-shift,
763 * and (c) the value must fit within the timinca register space
764 * => math based on internal DMA clock rate and available bits
766 * Note that when there is no link, internal DMA clock is same as when
767 * link speed is 10Gb. Set the registers correctly even when link is
768 * down to preserve the clock setting
770 switch (adapter
->link_speed
) {
771 case IXGBE_LINK_SPEED_100_FULL
:
772 incval
= IXGBE_INCVAL_100
;
773 shift
= IXGBE_INCVAL_SHIFT_100
;
775 case IXGBE_LINK_SPEED_1GB_FULL
:
776 incval
= IXGBE_INCVAL_1GB
;
777 shift
= IXGBE_INCVAL_SHIFT_1GB
;
779 case IXGBE_LINK_SPEED_10GB_FULL
:
781 incval
= IXGBE_INCVAL_10GB
;
782 shift
= IXGBE_INCVAL_SHIFT_10GB
;
787 * Modify the calculated values to fit within the correct
788 * number of bits specified by the hardware. The 82599 doesn't
789 * have the same space as the X540, so bitshift the calculated
792 switch (hw
->mac
.type
) {
794 IXGBE_WRITE_REG(hw
, IXGBE_TIMINCA
, incval
);
796 case ixgbe_mac_82599EB
:
797 incval
>>= IXGBE_INCVAL_SHIFT_82599
;
798 shift
-= IXGBE_INCVAL_SHIFT_82599
;
799 IXGBE_WRITE_REG(hw
, IXGBE_TIMINCA
,
800 (1 << IXGBE_INCPER_SHIFT_82599
) |
804 /* other devices aren't supported */
808 /* update the base incval used to calculate frequency adjustment */
809 ACCESS_ONCE(adapter
->base_incval
) = incval
;
812 /* need lock to prevent incorrect read while modifying cyclecounter */
813 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
815 memset(&adapter
->cc
, 0, sizeof(adapter
->cc
));
816 adapter
->cc
.read
= ixgbe_ptp_read
;
817 adapter
->cc
.mask
= CLOCKSOURCE_MASK(64);
818 adapter
->cc
.shift
= shift
;
819 adapter
->cc
.mult
= 1;
821 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
826 * @adapter: the ixgbe private board structure
828 * When the MAC resets, all timesync features are reset. This function should be
829 * called to re-enable the PTP clock structure. It will re-init the timecounter
830 * structure based on the kernel time as well as setup the cycle counter data.
832 void ixgbe_ptp_reset(struct ixgbe_adapter
*adapter
)
834 struct ixgbe_hw
*hw
= &adapter
->hw
;
837 /* set SYSTIME registers to 0 just in case */
838 IXGBE_WRITE_REG(hw
, IXGBE_SYSTIML
, 0x00000000);
839 IXGBE_WRITE_REG(hw
, IXGBE_SYSTIMH
, 0x00000000);
840 IXGBE_WRITE_FLUSH(hw
);
842 ixgbe_ptp_start_cyclecounter(adapter
);
844 spin_lock_irqsave(&adapter
->tmreg_lock
, flags
);
846 /* reset the ns time counter */
847 timecounter_init(&adapter
->tc
, &adapter
->cc
,
848 ktime_to_ns(ktime_get_real()));
850 spin_unlock_irqrestore(&adapter
->tmreg_lock
, flags
);
853 * Now that the shift has been calculated and the systime
854 * registers reset, (re-)enable the Clock out feature
856 ixgbe_ptp_setup_sdp(adapter
);
861 * @adapter: the ixgbe private adapter structure
863 * This function performs the required steps for enabling ptp
864 * support. If ptp support has already been loaded it simply calls the
865 * cyclecounter init routine and exits.
867 void ixgbe_ptp_init(struct ixgbe_adapter
*adapter
)
869 struct net_device
*netdev
= adapter
->netdev
;
871 switch (adapter
->hw
.mac
.type
) {
873 snprintf(adapter
->ptp_caps
.name
, 16, "%s", netdev
->name
);
874 adapter
->ptp_caps
.owner
= THIS_MODULE
;
875 adapter
->ptp_caps
.max_adj
= 250000000;
876 adapter
->ptp_caps
.n_alarm
= 0;
877 adapter
->ptp_caps
.n_ext_ts
= 0;
878 adapter
->ptp_caps
.n_per_out
= 0;
879 adapter
->ptp_caps
.pps
= 1;
880 adapter
->ptp_caps
.adjfreq
= ixgbe_ptp_adjfreq
;
881 adapter
->ptp_caps
.adjtime
= ixgbe_ptp_adjtime
;
882 adapter
->ptp_caps
.gettime
= ixgbe_ptp_gettime
;
883 adapter
->ptp_caps
.settime
= ixgbe_ptp_settime
;
884 adapter
->ptp_caps
.enable
= ixgbe_ptp_enable
;
886 case ixgbe_mac_82599EB
:
887 snprintf(adapter
->ptp_caps
.name
, 16, "%s", netdev
->name
);
888 adapter
->ptp_caps
.owner
= THIS_MODULE
;
889 adapter
->ptp_caps
.max_adj
= 250000000;
890 adapter
->ptp_caps
.n_alarm
= 0;
891 adapter
->ptp_caps
.n_ext_ts
= 0;
892 adapter
->ptp_caps
.n_per_out
= 0;
893 adapter
->ptp_caps
.pps
= 0;
894 adapter
->ptp_caps
.adjfreq
= ixgbe_ptp_adjfreq
;
895 adapter
->ptp_caps
.adjtime
= ixgbe_ptp_adjtime
;
896 adapter
->ptp_caps
.gettime
= ixgbe_ptp_gettime
;
897 adapter
->ptp_caps
.settime
= ixgbe_ptp_settime
;
898 adapter
->ptp_caps
.enable
= ixgbe_ptp_enable
;
901 adapter
->ptp_clock
= NULL
;
905 /* initialize the ptp filter */
906 if (ptp_filter_init(ptp_filter
, ARRAY_SIZE(ptp_filter
)))
907 e_dev_warn("ptp_filter_init failed\n");
909 spin_lock_init(&adapter
->tmreg_lock
);
911 adapter
->ptp_clock
= ptp_clock_register(&adapter
->ptp_caps
,
912 &adapter
->pdev
->dev
);
913 if (IS_ERR(adapter
->ptp_clock
)) {
914 adapter
->ptp_clock
= NULL
;
915 e_dev_err("ptp_clock_register failed\n");
917 e_dev_info("registered PHC device on %s\n", netdev
->name
);
919 ixgbe_ptp_reset(adapter
);
921 /* set the flag that PTP has been enabled */
922 adapter
->flags2
|= IXGBE_FLAG2_PTP_ENABLED
;
928 * ixgbe_ptp_stop - disable ptp device and stop the overflow check
929 * @adapter: pointer to adapter struct
931 * this function stops the ptp support, and cancels the delayed work.
933 void ixgbe_ptp_stop(struct ixgbe_adapter
*adapter
)
935 /* stop the overflow check task */
936 adapter
->flags2
&= ~(IXGBE_FLAG2_PTP_ENABLED
|
937 IXGBE_FLAG2_PTP_PPS_ENABLED
);
939 ixgbe_ptp_setup_sdp(adapter
);
941 if (adapter
->ptp_clock
) {
942 ptp_clock_unregister(adapter
->ptp_clock
);
943 adapter
->ptp_clock
= NULL
;
944 e_dev_info("removed PHC on %s\n",
945 adapter
->netdev
->name
);